Andy Shevchenko | 5e4e6fb | 2017-01-03 19:01:17 +0200 | [diff] [blame] | 1 | #include <linux/bitops.h> |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2 | #include <linux/kernel.h> |
| 3 | #include <linux/module.h> |
Daniel Glöckner | ff77c35 | 2009-09-22 16:46:38 -0700 | [diff] [blame] | 4 | #include <linux/interrupt.h> |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 5 | #include <linux/irq.h> |
| 6 | #include <linux/spinlock.h> |
Alexandre Courbot | 1a989d0 | 2013-02-03 01:29:24 +0900 | [diff] [blame] | 7 | #include <linux/list.h> |
David Brownell | d8f388d8 | 2008-07-25 01:46:07 -0700 | [diff] [blame] | 8 | #include <linux/device.h> |
| 9 | #include <linux/err.h> |
| 10 | #include <linux/debugfs.h> |
| 11 | #include <linux/seq_file.h> |
| 12 | #include <linux/gpio.h> |
Anton Vorontsov | 391c970 | 2010-06-08 07:48:17 -0600 | [diff] [blame] | 13 | #include <linux/of_gpio.h> |
Daniel Glöckner | ff77c35 | 2009-09-22 16:46:38 -0700 | [diff] [blame] | 14 | #include <linux/idr.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
Rafael J. Wysocki | 7b19981 | 2013-11-11 22:41:56 +0100 | [diff] [blame] | 16 | #include <linux/acpi.h> |
Alexandre Courbot | 53e7cac | 2013-11-16 21:44:52 +0900 | [diff] [blame] | 17 | #include <linux/gpio/driver.h> |
Linus Walleij | 0a6d315 | 2014-07-24 20:08:55 +0200 | [diff] [blame] | 18 | #include <linux/gpio/machine.h> |
Jonas Gorski | c771c2f | 2015-10-11 17:34:15 +0200 | [diff] [blame] | 19 | #include <linux/pinctrl/consumer.h> |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 20 | #include <linux/cdev.h> |
| 21 | #include <linux/fs.h> |
| 22 | #include <linux/uaccess.h> |
Linus Walleij | 8b92e17 | 2016-05-27 14:24:04 +0200 | [diff] [blame] | 23 | #include <linux/compat.h> |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 24 | #include <linux/anon_inodes.h> |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 25 | #include <linux/file.h> |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 26 | #include <linux/kfifo.h> |
| 27 | #include <linux/poll.h> |
| 28 | #include <linux/timekeeping.h> |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 29 | #include <uapi/linux/gpio.h> |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 30 | |
Mika Westerberg | 664e3e5 | 2014-01-08 12:40:54 +0200 | [diff] [blame] | 31 | #include "gpiolib.h" |
| 32 | |
Uwe Kleine-König | 3f397c21 | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 33 | #define CREATE_TRACE_POINTS |
| 34 | #include <trace/events/gpio.h> |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 35 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 36 | /* Implementation infrastructure for GPIO interfaces. |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 37 | * |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 38 | * The GPIO programming interface allows for inlining speed-critical |
| 39 | * get/set operations for common cases, so that access to SOC-integrated |
| 40 | * GPIOs can sometimes cost only an instruction or two per bit. |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 41 | */ |
| 42 | |
| 43 | |
| 44 | /* When debugging, extend minimal trust to callers and platform code. |
| 45 | * Also emit diagnostic messages that may help initial bringup, when |
| 46 | * board setup or driver bugs are most common. |
| 47 | * |
| 48 | * Otherwise, minimize overhead in what may be bitbanging codepaths. |
| 49 | */ |
| 50 | #ifdef DEBUG |
| 51 | #define extra_checks 1 |
| 52 | #else |
| 53 | #define extra_checks 0 |
| 54 | #endif |
| 55 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 56 | /* Device and char device-related information */ |
| 57 | static DEFINE_IDA(gpio_ida); |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 58 | static dev_t gpio_devt; |
| 59 | #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ |
| 60 | static struct bus_type gpio_bus_type = { |
| 61 | .name = "gpio", |
| 62 | }; |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 63 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 64 | /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
| 65 | * While any GPIO is requested, its gpio_chip is not removable; |
| 66 | * each GPIO's "requested" flag serves as a lock and refcount. |
| 67 | */ |
Alexandre Courbot | 0eb4c6c | 2014-07-01 14:45:15 +0900 | [diff] [blame] | 68 | DEFINE_SPINLOCK(gpio_lock); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 69 | |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 70 | static DEFINE_MUTEX(gpio_lookup_lock); |
| 71 | static LIST_HEAD(gpio_lookup_list); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 72 | LIST_HEAD(gpio_devices); |
Johan Hovold | 6d86750 | 2015-05-04 17:23:25 +0200 | [diff] [blame] | 73 | |
| 74 | static void gpiochip_free_hogs(struct gpio_chip *chip); |
| 75 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip); |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 76 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip); |
| 77 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip); |
Johan Hovold | 6d86750 | 2015-05-04 17:23:25 +0200 | [diff] [blame] | 78 | |
Guenter Roeck | 159f3cd | 2016-03-31 08:11:30 -0700 | [diff] [blame] | 79 | static bool gpiolib_initialized; |
Johan Hovold | 6d86750 | 2015-05-04 17:23:25 +0200 | [diff] [blame] | 80 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 81 | static inline void desc_set_label(struct gpio_desc *d, const char *label) |
| 82 | { |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 83 | d->label = label; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 84 | } |
| 85 | |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 86 | /** |
| 87 | * Convert a GPIO number to its descriptor |
| 88 | */ |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 89 | struct gpio_desc *gpio_to_desc(unsigned gpio) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 90 | { |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 91 | struct gpio_device *gdev; |
Alexandre Courbot | 14e85c0 | 2014-11-19 16:51:27 +0900 | [diff] [blame] | 92 | unsigned long flags; |
| 93 | |
| 94 | spin_lock_irqsave(&gpio_lock, flags); |
| 95 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 96 | list_for_each_entry(gdev, &gpio_devices, list) { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 97 | if (gdev->base <= gpio && |
| 98 | gdev->base + gdev->ngpio > gpio) { |
Alexandre Courbot | 14e85c0 | 2014-11-19 16:51:27 +0900 | [diff] [blame] | 99 | spin_unlock_irqrestore(&gpio_lock, flags); |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 100 | return &gdev->descs[gpio - gdev->base]; |
Alexandre Courbot | 14e85c0 | 2014-11-19 16:51:27 +0900 | [diff] [blame] | 101 | } |
| 102 | } |
| 103 | |
| 104 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 105 | |
Alexandre Courbot | 0e9a5ed | 2014-12-02 23:15:05 +0900 | [diff] [blame] | 106 | if (!gpio_is_valid(gpio)) |
| 107 | WARN(1, "invalid GPIO %d\n", gpio); |
| 108 | |
Alexandre Courbot | 14e85c0 | 2014-11-19 16:51:27 +0900 | [diff] [blame] | 109 | return NULL; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 110 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 111 | EXPORT_SYMBOL_GPL(gpio_to_desc); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 112 | |
| 113 | /** |
Alexandre Courbot | bb1e88c | 2014-02-09 17:43:54 +0900 | [diff] [blame] | 114 | * Get the GPIO descriptor corresponding to the given hw number for this chip. |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 115 | */ |
Alexandre Courbot | bb1e88c | 2014-02-09 17:43:54 +0900 | [diff] [blame] | 116 | struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, |
| 117 | u16 hwnum) |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 118 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 119 | struct gpio_device *gdev = chip->gpiodev; |
| 120 | |
| 121 | if (hwnum >= gdev->ngpio) |
Alexandre Courbot | b7d0a28 | 2013-12-03 12:31:11 +0900 | [diff] [blame] | 122 | return ERR_PTR(-EINVAL); |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 123 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 124 | return &gdev->descs[hwnum]; |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 125 | } |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 126 | |
| 127 | /** |
| 128 | * Convert a GPIO descriptor to the integer namespace. |
| 129 | * This should disappear in the future but is needed since we still |
| 130 | * use GPIO numbers for error messages and sysfs nodes |
| 131 | */ |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 132 | int desc_to_gpio(const struct gpio_desc *desc) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 133 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 134 | return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 135 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 136 | EXPORT_SYMBOL_GPL(desc_to_gpio); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 137 | |
| 138 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 139 | /** |
| 140 | * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs |
| 141 | * @desc: descriptor to return the chip of |
| 142 | */ |
| 143 | struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 144 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 145 | if (!desc || !desc->gdev || !desc->gdev->chip) |
| 146 | return NULL; |
| 147 | return desc->gdev->chip; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 148 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 149 | EXPORT_SYMBOL_GPL(gpiod_to_chip); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 150 | |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 151 | /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
| 152 | static int gpiochip_find_base(int ngpio) |
| 153 | { |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 154 | struct gpio_device *gdev; |
Alexandre Courbot | 83cabe3 | 2013-02-03 01:29:28 +0900 | [diff] [blame] | 155 | int base = ARCH_NR_GPIOS - ngpio; |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 156 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 157 | list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
Alexandre Courbot | 83cabe3 | 2013-02-03 01:29:28 +0900 | [diff] [blame] | 158 | /* found a free space? */ |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 159 | if (gdev->base + gdev->ngpio <= base) |
Alexandre Courbot | 83cabe3 | 2013-02-03 01:29:28 +0900 | [diff] [blame] | 160 | break; |
| 161 | else |
| 162 | /* nope, check the space right before the chip */ |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 163 | base = gdev->base - ngpio; |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 164 | } |
| 165 | |
Alexandre Courbot | 83cabe3 | 2013-02-03 01:29:28 +0900 | [diff] [blame] | 166 | if (gpio_is_valid(base)) { |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 167 | pr_debug("%s: found new base at %d\n", __func__, base); |
Alexandre Courbot | 83cabe3 | 2013-02-03 01:29:28 +0900 | [diff] [blame] | 168 | return base; |
| 169 | } else { |
| 170 | pr_err("%s: cannot find free range\n", __func__); |
| 171 | return -ENOSPC; |
Anton Vorontsov | 169b6a7 | 2008-04-28 02:14:47 -0700 | [diff] [blame] | 172 | } |
Anton Vorontsov | 169b6a7 | 2008-04-28 02:14:47 -0700 | [diff] [blame] | 173 | } |
| 174 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 175 | /** |
| 176 | * gpiod_get_direction - return the current direction of a GPIO |
| 177 | * @desc: GPIO to get the direction of |
| 178 | * |
| 179 | * Return GPIOF_DIR_IN or GPIOF_DIR_OUT, or an error code in case of error. |
| 180 | * |
| 181 | * This function may sleep if gpiod_cansleep() is true. |
| 182 | */ |
Alexandre Courbot | 8e53b0f | 2014-11-25 17:16:31 +0900 | [diff] [blame] | 183 | int gpiod_get_direction(struct gpio_desc *desc) |
Mathias Nyman | 80b0a60 | 2012-10-24 17:25:27 +0300 | [diff] [blame] | 184 | { |
| 185 | struct gpio_chip *chip; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 186 | unsigned offset; |
Mathias Nyman | 80b0a60 | 2012-10-24 17:25:27 +0300 | [diff] [blame] | 187 | int status = -EINVAL; |
| 188 | |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 189 | chip = gpiod_to_chip(desc); |
| 190 | offset = gpio_chip_hwgpio(desc); |
Mathias Nyman | 80b0a60 | 2012-10-24 17:25:27 +0300 | [diff] [blame] | 191 | |
| 192 | if (!chip->get_direction) |
| 193 | return status; |
| 194 | |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 195 | status = chip->get_direction(chip, offset); |
Mathias Nyman | 80b0a60 | 2012-10-24 17:25:27 +0300 | [diff] [blame] | 196 | if (status > 0) { |
| 197 | /* GPIOF_DIR_IN, or other positive */ |
| 198 | status = 1; |
Alexandre Courbot | 8e53b0f | 2014-11-25 17:16:31 +0900 | [diff] [blame] | 199 | clear_bit(FLAG_IS_OUT, &desc->flags); |
Mathias Nyman | 80b0a60 | 2012-10-24 17:25:27 +0300 | [diff] [blame] | 200 | } |
| 201 | if (status == 0) { |
| 202 | /* GPIOF_DIR_OUT */ |
Alexandre Courbot | 8e53b0f | 2014-11-25 17:16:31 +0900 | [diff] [blame] | 203 | set_bit(FLAG_IS_OUT, &desc->flags); |
Mathias Nyman | 80b0a60 | 2012-10-24 17:25:27 +0300 | [diff] [blame] | 204 | } |
| 205 | return status; |
| 206 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 207 | EXPORT_SYMBOL_GPL(gpiod_get_direction); |
Mathias Nyman | 80b0a60 | 2012-10-24 17:25:27 +0300 | [diff] [blame] | 208 | |
Alexandre Courbot | 1a989d0 | 2013-02-03 01:29:24 +0900 | [diff] [blame] | 209 | /* |
| 210 | * Add a new chip to the global chips list, keeping the list of chips sorted |
Bamvor Jian Zhang | ef7c755 | 2015-11-16 13:02:46 +0800 | [diff] [blame] | 211 | * by range(means [base, base + ngpio - 1]) order. |
Alexandre Courbot | 1a989d0 | 2013-02-03 01:29:24 +0900 | [diff] [blame] | 212 | * |
| 213 | * Return -EBUSY if the new chip overlaps with some other chip's integer |
| 214 | * space. |
| 215 | */ |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 216 | static int gpiodev_add_to_list(struct gpio_device *gdev) |
Alexandre Courbot | 1a989d0 | 2013-02-03 01:29:24 +0900 | [diff] [blame] | 217 | { |
Bamvor Jian Zhang | a961f9b | 2016-02-26 22:37:14 +0800 | [diff] [blame] | 218 | struct gpio_device *prev, *next; |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 219 | |
| 220 | if (list_empty(&gpio_devices)) { |
Bamvor Jian Zhang | a961f9b | 2016-02-26 22:37:14 +0800 | [diff] [blame] | 221 | /* initial entry in list */ |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 222 | list_add_tail(&gdev->list, &gpio_devices); |
Sudip Mukherjee | e28ecca | 2015-12-27 19:06:50 +0530 | [diff] [blame] | 223 | return 0; |
Alexandre Courbot | 1a989d0 | 2013-02-03 01:29:24 +0900 | [diff] [blame] | 224 | } |
| 225 | |
Bamvor Jian Zhang | a961f9b | 2016-02-26 22:37:14 +0800 | [diff] [blame] | 226 | next = list_entry(gpio_devices.next, struct gpio_device, list); |
| 227 | if (gdev->base + gdev->ngpio <= next->base) { |
| 228 | /* add before first entry */ |
| 229 | list_add(&gdev->list, &gpio_devices); |
Julien Grossholtz | 96098df | 2016-01-07 16:46:45 -0500 | [diff] [blame] | 230 | return 0; |
| 231 | } |
Alexandre Courbot | 1a989d0 | 2013-02-03 01:29:24 +0900 | [diff] [blame] | 232 | |
Bamvor Jian Zhang | a961f9b | 2016-02-26 22:37:14 +0800 | [diff] [blame] | 233 | prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
| 234 | if (prev->base + prev->ngpio <= gdev->base) { |
| 235 | /* add behind last entry */ |
| 236 | list_add_tail(&gdev->list, &gpio_devices); |
| 237 | return 0; |
| 238 | } |
Bamvor Jian Zhang | ef7c755 | 2015-11-16 13:02:46 +0800 | [diff] [blame] | 239 | |
Bamvor Jian Zhang | a961f9b | 2016-02-26 22:37:14 +0800 | [diff] [blame] | 240 | list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
| 241 | /* at the end of the list */ |
| 242 | if (&next->list == &gpio_devices) |
| 243 | break; |
| 244 | |
| 245 | /* add between prev and next */ |
| 246 | if (prev->base + prev->ngpio <= gdev->base |
| 247 | && gdev->base + gdev->ngpio <= next->base) { |
| 248 | list_add(&gdev->list, &prev->list); |
| 249 | return 0; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); |
| 254 | return -EBUSY; |
Alexandre Courbot | 1a989d0 | 2013-02-03 01:29:24 +0900 | [diff] [blame] | 255 | } |
| 256 | |
Linus Walleij | f881bab | 2015-09-23 16:20:43 -0700 | [diff] [blame] | 257 | /** |
| 258 | * Convert a GPIO name to its descriptor |
| 259 | */ |
| 260 | static struct gpio_desc *gpio_name_to_desc(const char * const name) |
| 261 | { |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 262 | struct gpio_device *gdev; |
Linus Walleij | f881bab | 2015-09-23 16:20:43 -0700 | [diff] [blame] | 263 | unsigned long flags; |
| 264 | |
| 265 | spin_lock_irqsave(&gpio_lock, flags); |
| 266 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 267 | list_for_each_entry(gdev, &gpio_devices, list) { |
Linus Walleij | f881bab | 2015-09-23 16:20:43 -0700 | [diff] [blame] | 268 | int i; |
| 269 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 270 | for (i = 0; i != gdev->ngpio; ++i) { |
| 271 | struct gpio_desc *desc = &gdev->descs[i]; |
Linus Walleij | f881bab | 2015-09-23 16:20:43 -0700 | [diff] [blame] | 272 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 273 | if (!desc->name || !name) |
Linus Walleij | f881bab | 2015-09-23 16:20:43 -0700 | [diff] [blame] | 274 | continue; |
| 275 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 276 | if (!strcmp(desc->name, name)) { |
Linus Walleij | f881bab | 2015-09-23 16:20:43 -0700 | [diff] [blame] | 277 | spin_unlock_irqrestore(&gpio_lock, flags); |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 278 | return desc; |
Linus Walleij | f881bab | 2015-09-23 16:20:43 -0700 | [diff] [blame] | 279 | } |
| 280 | } |
| 281 | } |
| 282 | |
| 283 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 284 | |
| 285 | return NULL; |
| 286 | } |
| 287 | |
Markus Pargmann | 5f3ca73 | 2015-08-14 16:11:00 +0200 | [diff] [blame] | 288 | /* |
| 289 | * Takes the names from gc->names and checks if they are all unique. If they |
| 290 | * are, they are assigned to their gpio descriptors. |
| 291 | * |
Bamvor Jian Zhang | ed37915 | 2015-11-14 16:43:20 +0800 | [diff] [blame] | 292 | * Warning if one of the names is already used for a different GPIO. |
Markus Pargmann | 5f3ca73 | 2015-08-14 16:11:00 +0200 | [diff] [blame] | 293 | */ |
| 294 | static int gpiochip_set_desc_names(struct gpio_chip *gc) |
| 295 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 296 | struct gpio_device *gdev = gc->gpiodev; |
Markus Pargmann | 5f3ca73 | 2015-08-14 16:11:00 +0200 | [diff] [blame] | 297 | int i; |
| 298 | |
| 299 | if (!gc->names) |
| 300 | return 0; |
| 301 | |
| 302 | /* First check all names if they are unique */ |
| 303 | for (i = 0; i != gc->ngpio; ++i) { |
| 304 | struct gpio_desc *gpio; |
| 305 | |
| 306 | gpio = gpio_name_to_desc(gc->names[i]); |
Linus Walleij | f881bab | 2015-09-23 16:20:43 -0700 | [diff] [blame] | 307 | if (gpio) |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 308 | dev_warn(&gdev->dev, |
Linus Walleij | 34ffd85 | 2015-10-20 11:31:54 +0200 | [diff] [blame] | 309 | "Detected name collision for GPIO name '%s'\n", |
Linus Walleij | f881bab | 2015-09-23 16:20:43 -0700 | [diff] [blame] | 310 | gc->names[i]); |
Markus Pargmann | 5f3ca73 | 2015-08-14 16:11:00 +0200 | [diff] [blame] | 311 | } |
| 312 | |
| 313 | /* Then add all names to the GPIO descriptors */ |
| 314 | for (i = 0; i != gc->ngpio; ++i) |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 315 | gdev->descs[i].name = gc->names[i]; |
Markus Pargmann | 5f3ca73 | 2015-08-14 16:11:00 +0200 | [diff] [blame] | 316 | |
| 317 | return 0; |
| 318 | } |
| 319 | |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 320 | /* |
| 321 | * GPIO line handle management |
| 322 | */ |
| 323 | |
| 324 | /** |
| 325 | * struct linehandle_state - contains the state of a userspace handle |
| 326 | * @gdev: the GPIO device the handle pertains to |
| 327 | * @label: consumer label used to tag descriptors |
| 328 | * @descs: the GPIO descriptors held by this handle |
| 329 | * @numdescs: the number of descriptors held in the descs array |
| 330 | */ |
| 331 | struct linehandle_state { |
| 332 | struct gpio_device *gdev; |
| 333 | const char *label; |
| 334 | struct gpio_desc *descs[GPIOHANDLES_MAX]; |
| 335 | u32 numdescs; |
| 336 | }; |
| 337 | |
Lars-Peter Clausen | e3e847c | 2016-10-18 16:54:05 +0200 | [diff] [blame] | 338 | #define GPIOHANDLE_REQUEST_VALID_FLAGS \ |
| 339 | (GPIOHANDLE_REQUEST_INPUT | \ |
| 340 | GPIOHANDLE_REQUEST_OUTPUT | \ |
| 341 | GPIOHANDLE_REQUEST_ACTIVE_LOW | \ |
| 342 | GPIOHANDLE_REQUEST_OPEN_DRAIN | \ |
| 343 | GPIOHANDLE_REQUEST_OPEN_SOURCE) |
| 344 | |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 345 | static long linehandle_ioctl(struct file *filep, unsigned int cmd, |
| 346 | unsigned long arg) |
| 347 | { |
| 348 | struct linehandle_state *lh = filep->private_data; |
| 349 | void __user *ip = (void __user *)arg; |
| 350 | struct gpiohandle_data ghd; |
| 351 | int i; |
| 352 | |
| 353 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { |
| 354 | int val; |
| 355 | |
Lars-Peter Clausen | 3eded5d | 2016-10-18 16:54:02 +0200 | [diff] [blame] | 356 | memset(&ghd, 0, sizeof(ghd)); |
| 357 | |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 358 | /* TODO: check if descriptors are really input */ |
| 359 | for (i = 0; i < lh->numdescs; i++) { |
| 360 | val = gpiod_get_value_cansleep(lh->descs[i]); |
| 361 | if (val < 0) |
| 362 | return val; |
| 363 | ghd.values[i] = val; |
| 364 | } |
| 365 | |
| 366 | if (copy_to_user(ip, &ghd, sizeof(ghd))) |
| 367 | return -EFAULT; |
| 368 | |
| 369 | return 0; |
| 370 | } else if (cmd == GPIOHANDLE_SET_LINE_VALUES_IOCTL) { |
| 371 | int vals[GPIOHANDLES_MAX]; |
| 372 | |
| 373 | /* TODO: check if descriptors are really output */ |
| 374 | if (copy_from_user(&ghd, ip, sizeof(ghd))) |
| 375 | return -EFAULT; |
| 376 | |
| 377 | /* Clamp all values to [0,1] */ |
| 378 | for (i = 0; i < lh->numdescs; i++) |
| 379 | vals[i] = !!ghd.values[i]; |
| 380 | |
| 381 | /* Reuse the array setting function */ |
| 382 | gpiod_set_array_value_complex(false, |
| 383 | true, |
| 384 | lh->numdescs, |
| 385 | lh->descs, |
| 386 | vals); |
| 387 | return 0; |
| 388 | } |
| 389 | return -EINVAL; |
| 390 | } |
| 391 | |
| 392 | #ifdef CONFIG_COMPAT |
| 393 | static long linehandle_ioctl_compat(struct file *filep, unsigned int cmd, |
| 394 | unsigned long arg) |
| 395 | { |
| 396 | return linehandle_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); |
| 397 | } |
| 398 | #endif |
| 399 | |
| 400 | static int linehandle_release(struct inode *inode, struct file *filep) |
| 401 | { |
| 402 | struct linehandle_state *lh = filep->private_data; |
| 403 | struct gpio_device *gdev = lh->gdev; |
| 404 | int i; |
| 405 | |
| 406 | for (i = 0; i < lh->numdescs; i++) |
| 407 | gpiod_free(lh->descs[i]); |
| 408 | kfree(lh->label); |
| 409 | kfree(lh); |
| 410 | put_device(&gdev->dev); |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | static const struct file_operations linehandle_fileops = { |
| 415 | .release = linehandle_release, |
| 416 | .owner = THIS_MODULE, |
| 417 | .llseek = noop_llseek, |
| 418 | .unlocked_ioctl = linehandle_ioctl, |
| 419 | #ifdef CONFIG_COMPAT |
| 420 | .compat_ioctl = linehandle_ioctl_compat, |
| 421 | #endif |
| 422 | }; |
| 423 | |
| 424 | static int linehandle_create(struct gpio_device *gdev, void __user *ip) |
| 425 | { |
| 426 | struct gpiohandle_request handlereq; |
| 427 | struct linehandle_state *lh; |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 428 | struct file *file; |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 429 | int fd, i, ret; |
| 430 | |
| 431 | if (copy_from_user(&handlereq, ip, sizeof(handlereq))) |
| 432 | return -EFAULT; |
| 433 | if ((handlereq.lines == 0) || (handlereq.lines > GPIOHANDLES_MAX)) |
| 434 | return -EINVAL; |
| 435 | |
| 436 | lh = kzalloc(sizeof(*lh), GFP_KERNEL); |
| 437 | if (!lh) |
| 438 | return -ENOMEM; |
| 439 | lh->gdev = gdev; |
| 440 | get_device(&gdev->dev); |
| 441 | |
| 442 | /* Make sure this is terminated */ |
| 443 | handlereq.consumer_label[sizeof(handlereq.consumer_label)-1] = '\0'; |
| 444 | if (strlen(handlereq.consumer_label)) { |
| 445 | lh->label = kstrdup(handlereq.consumer_label, |
| 446 | GFP_KERNEL); |
| 447 | if (!lh->label) { |
| 448 | ret = -ENOMEM; |
| 449 | goto out_free_lh; |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | /* Request each GPIO */ |
| 454 | for (i = 0; i < handlereq.lines; i++) { |
| 455 | u32 offset = handlereq.lineoffsets[i]; |
| 456 | u32 lflags = handlereq.flags; |
| 457 | struct gpio_desc *desc; |
| 458 | |
Lars-Peter Clausen | e405f9f | 2016-10-18 16:54:01 +0200 | [diff] [blame] | 459 | if (offset >= gdev->ngpio) { |
| 460 | ret = -EINVAL; |
| 461 | goto out_free_descs; |
| 462 | } |
| 463 | |
Lars-Peter Clausen | e3e847c | 2016-10-18 16:54:05 +0200 | [diff] [blame] | 464 | /* Return an error if a unknown flag is set */ |
| 465 | if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) { |
| 466 | ret = -EINVAL; |
| 467 | goto out_free_descs; |
| 468 | } |
| 469 | |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 470 | desc = &gdev->descs[offset]; |
| 471 | ret = gpiod_request(desc, lh->label); |
| 472 | if (ret) |
| 473 | goto out_free_descs; |
| 474 | lh->descs[i] = desc; |
| 475 | |
| 476 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) |
| 477 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); |
| 478 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) |
| 479 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); |
| 480 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) |
| 481 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); |
| 482 | |
| 483 | /* |
| 484 | * Lines have to be requested explicitly for input |
| 485 | * or output, else the line will be treated "as is". |
| 486 | */ |
| 487 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { |
| 488 | int val = !!handlereq.default_values[i]; |
| 489 | |
| 490 | ret = gpiod_direction_output(desc, val); |
| 491 | if (ret) |
| 492 | goto out_free_descs; |
| 493 | } else if (lflags & GPIOHANDLE_REQUEST_INPUT) { |
| 494 | ret = gpiod_direction_input(desc); |
| 495 | if (ret) |
| 496 | goto out_free_descs; |
| 497 | } |
| 498 | dev_dbg(&gdev->dev, "registered chardev handle for line %d\n", |
| 499 | offset); |
| 500 | } |
Linus Walleij | e2f608b | 2016-06-18 10:56:43 +0200 | [diff] [blame] | 501 | /* Let i point at the last handle */ |
| 502 | i--; |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 503 | lh->numdescs = handlereq.lines; |
| 504 | |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 505 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 506 | if (fd < 0) { |
| 507 | ret = fd; |
| 508 | goto out_free_descs; |
| 509 | } |
| 510 | |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 511 | file = anon_inode_getfile("gpio-linehandle", |
| 512 | &linehandle_fileops, |
| 513 | lh, |
| 514 | O_RDONLY | O_CLOEXEC); |
| 515 | if (IS_ERR(file)) { |
| 516 | ret = PTR_ERR(file); |
| 517 | goto out_put_unused_fd; |
| 518 | } |
| 519 | |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 520 | handlereq.fd = fd; |
Linus Walleij | d932cd4 | 2016-07-04 13:13:04 +0200 | [diff] [blame] | 521 | if (copy_to_user(ip, &handlereq, sizeof(handlereq))) { |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 522 | /* |
| 523 | * fput() will trigger the release() callback, so do not go onto |
| 524 | * the regular error cleanup path here. |
| 525 | */ |
| 526 | fput(file); |
| 527 | put_unused_fd(fd); |
| 528 | return -EFAULT; |
Linus Walleij | d932cd4 | 2016-07-04 13:13:04 +0200 | [diff] [blame] | 529 | } |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 530 | |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 531 | fd_install(fd, file); |
| 532 | |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 533 | dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n", |
| 534 | lh->numdescs); |
| 535 | |
| 536 | return 0; |
| 537 | |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 538 | out_put_unused_fd: |
| 539 | put_unused_fd(fd); |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 540 | out_free_descs: |
| 541 | for (; i >= 0; i--) |
| 542 | gpiod_free(lh->descs[i]); |
| 543 | kfree(lh->label); |
| 544 | out_free_lh: |
| 545 | kfree(lh); |
| 546 | put_device(&gdev->dev); |
| 547 | return ret; |
| 548 | } |
| 549 | |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 550 | /* |
| 551 | * GPIO line event management |
| 552 | */ |
| 553 | |
| 554 | /** |
| 555 | * struct lineevent_state - contains the state of a userspace event |
| 556 | * @gdev: the GPIO device the event pertains to |
| 557 | * @label: consumer label used to tag descriptors |
| 558 | * @desc: the GPIO descriptor held by this event |
| 559 | * @eflags: the event flags this line was requested with |
| 560 | * @irq: the interrupt that trigger in response to events on this GPIO |
| 561 | * @wait: wait queue that handles blocking reads of events |
| 562 | * @events: KFIFO for the GPIO events |
| 563 | * @read_lock: mutex lock to protect reads from colliding with adding |
| 564 | * new events to the FIFO |
| 565 | */ |
| 566 | struct lineevent_state { |
| 567 | struct gpio_device *gdev; |
| 568 | const char *label; |
| 569 | struct gpio_desc *desc; |
| 570 | u32 eflags; |
| 571 | int irq; |
| 572 | wait_queue_head_t wait; |
| 573 | DECLARE_KFIFO(events, struct gpioevent_data, 16); |
| 574 | struct mutex read_lock; |
| 575 | }; |
| 576 | |
Lars-Peter Clausen | ac7dbb9 | 2016-10-18 16:54:06 +0200 | [diff] [blame] | 577 | #define GPIOEVENT_REQUEST_VALID_FLAGS \ |
| 578 | (GPIOEVENT_REQUEST_RISING_EDGE | \ |
| 579 | GPIOEVENT_REQUEST_FALLING_EDGE) |
| 580 | |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 581 | static unsigned int lineevent_poll(struct file *filep, |
| 582 | struct poll_table_struct *wait) |
| 583 | { |
| 584 | struct lineevent_state *le = filep->private_data; |
| 585 | unsigned int events = 0; |
| 586 | |
| 587 | poll_wait(filep, &le->wait, wait); |
| 588 | |
| 589 | if (!kfifo_is_empty(&le->events)) |
| 590 | events = POLLIN | POLLRDNORM; |
| 591 | |
| 592 | return events; |
| 593 | } |
| 594 | |
| 595 | |
| 596 | static ssize_t lineevent_read(struct file *filep, |
| 597 | char __user *buf, |
| 598 | size_t count, |
| 599 | loff_t *f_ps) |
| 600 | { |
| 601 | struct lineevent_state *le = filep->private_data; |
| 602 | unsigned int copied; |
| 603 | int ret; |
| 604 | |
| 605 | if (count < sizeof(struct gpioevent_data)) |
| 606 | return -EINVAL; |
| 607 | |
| 608 | do { |
| 609 | if (kfifo_is_empty(&le->events)) { |
| 610 | if (filep->f_flags & O_NONBLOCK) |
| 611 | return -EAGAIN; |
| 612 | |
| 613 | ret = wait_event_interruptible(le->wait, |
| 614 | !kfifo_is_empty(&le->events)); |
| 615 | if (ret) |
| 616 | return ret; |
| 617 | } |
| 618 | |
| 619 | if (mutex_lock_interruptible(&le->read_lock)) |
| 620 | return -ERESTARTSYS; |
| 621 | ret = kfifo_to_user(&le->events, buf, count, &copied); |
| 622 | mutex_unlock(&le->read_lock); |
| 623 | |
| 624 | if (ret) |
| 625 | return ret; |
| 626 | |
| 627 | /* |
| 628 | * If we couldn't read anything from the fifo (a different |
| 629 | * thread might have been faster) we either return -EAGAIN if |
| 630 | * the file descriptor is non-blocking, otherwise we go back to |
| 631 | * sleep and wait for more data to arrive. |
| 632 | */ |
| 633 | if (copied == 0 && (filep->f_flags & O_NONBLOCK)) |
| 634 | return -EAGAIN; |
| 635 | |
| 636 | } while (copied == 0); |
| 637 | |
| 638 | return copied; |
| 639 | } |
| 640 | |
| 641 | static int lineevent_release(struct inode *inode, struct file *filep) |
| 642 | { |
| 643 | struct lineevent_state *le = filep->private_data; |
| 644 | struct gpio_device *gdev = le->gdev; |
| 645 | |
| 646 | free_irq(le->irq, le); |
| 647 | gpiod_free(le->desc); |
| 648 | kfree(le->label); |
| 649 | kfree(le); |
| 650 | put_device(&gdev->dev); |
| 651 | return 0; |
| 652 | } |
| 653 | |
| 654 | static long lineevent_ioctl(struct file *filep, unsigned int cmd, |
| 655 | unsigned long arg) |
| 656 | { |
| 657 | struct lineevent_state *le = filep->private_data; |
| 658 | void __user *ip = (void __user *)arg; |
| 659 | struct gpiohandle_data ghd; |
| 660 | |
| 661 | /* |
| 662 | * We can get the value for an event line but not set it, |
| 663 | * because it is input by definition. |
| 664 | */ |
| 665 | if (cmd == GPIOHANDLE_GET_LINE_VALUES_IOCTL) { |
| 666 | int val; |
| 667 | |
Lars-Peter Clausen | d82aa4a | 2016-10-18 16:54:04 +0200 | [diff] [blame] | 668 | memset(&ghd, 0, sizeof(ghd)); |
| 669 | |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 670 | val = gpiod_get_value_cansleep(le->desc); |
| 671 | if (val < 0) |
| 672 | return val; |
| 673 | ghd.values[0] = val; |
| 674 | |
| 675 | if (copy_to_user(ip, &ghd, sizeof(ghd))) |
| 676 | return -EFAULT; |
| 677 | |
| 678 | return 0; |
| 679 | } |
| 680 | return -EINVAL; |
| 681 | } |
| 682 | |
| 683 | #ifdef CONFIG_COMPAT |
| 684 | static long lineevent_ioctl_compat(struct file *filep, unsigned int cmd, |
| 685 | unsigned long arg) |
| 686 | { |
| 687 | return lineevent_ioctl(filep, cmd, (unsigned long)compat_ptr(arg)); |
| 688 | } |
| 689 | #endif |
| 690 | |
| 691 | static const struct file_operations lineevent_fileops = { |
| 692 | .release = lineevent_release, |
| 693 | .read = lineevent_read, |
| 694 | .poll = lineevent_poll, |
| 695 | .owner = THIS_MODULE, |
| 696 | .llseek = noop_llseek, |
| 697 | .unlocked_ioctl = lineevent_ioctl, |
| 698 | #ifdef CONFIG_COMPAT |
| 699 | .compat_ioctl = lineevent_ioctl_compat, |
| 700 | #endif |
| 701 | }; |
| 702 | |
Ben Dooks | 33265b1 | 2016-06-17 16:03:13 +0100 | [diff] [blame] | 703 | static irqreturn_t lineevent_irq_thread(int irq, void *p) |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 704 | { |
| 705 | struct lineevent_state *le = p; |
| 706 | struct gpioevent_data ge; |
| 707 | int ret; |
| 708 | |
| 709 | ge.timestamp = ktime_get_real_ns(); |
| 710 | |
| 711 | if (le->eflags & GPIOEVENT_REQUEST_BOTH_EDGES) { |
| 712 | int level = gpiod_get_value_cansleep(le->desc); |
| 713 | |
| 714 | if (level) |
| 715 | /* Emit low-to-high event */ |
| 716 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; |
| 717 | else |
| 718 | /* Emit high-to-low event */ |
| 719 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; |
| 720 | } else if (le->eflags & GPIOEVENT_REQUEST_RISING_EDGE) { |
| 721 | /* Emit low-to-high event */ |
| 722 | ge.id = GPIOEVENT_EVENT_RISING_EDGE; |
| 723 | } else if (le->eflags & GPIOEVENT_REQUEST_FALLING_EDGE) { |
| 724 | /* Emit high-to-low event */ |
| 725 | ge.id = GPIOEVENT_EVENT_FALLING_EDGE; |
Arnd Bergmann | bc0207a | 2016-06-16 11:02:41 +0200 | [diff] [blame] | 726 | } else { |
| 727 | return IRQ_NONE; |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 728 | } |
| 729 | |
| 730 | ret = kfifo_put(&le->events, ge); |
| 731 | if (ret != 0) |
| 732 | wake_up_poll(&le->wait, POLLIN); |
| 733 | |
| 734 | return IRQ_HANDLED; |
| 735 | } |
| 736 | |
| 737 | static int lineevent_create(struct gpio_device *gdev, void __user *ip) |
| 738 | { |
| 739 | struct gpioevent_request eventreq; |
| 740 | struct lineevent_state *le; |
| 741 | struct gpio_desc *desc; |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 742 | struct file *file; |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 743 | u32 offset; |
| 744 | u32 lflags; |
| 745 | u32 eflags; |
| 746 | int fd; |
| 747 | int ret; |
| 748 | int irqflags = 0; |
| 749 | |
| 750 | if (copy_from_user(&eventreq, ip, sizeof(eventreq))) |
| 751 | return -EFAULT; |
| 752 | |
| 753 | le = kzalloc(sizeof(*le), GFP_KERNEL); |
| 754 | if (!le) |
| 755 | return -ENOMEM; |
| 756 | le->gdev = gdev; |
| 757 | get_device(&gdev->dev); |
| 758 | |
| 759 | /* Make sure this is terminated */ |
| 760 | eventreq.consumer_label[sizeof(eventreq.consumer_label)-1] = '\0'; |
| 761 | if (strlen(eventreq.consumer_label)) { |
| 762 | le->label = kstrdup(eventreq.consumer_label, |
| 763 | GFP_KERNEL); |
| 764 | if (!le->label) { |
| 765 | ret = -ENOMEM; |
| 766 | goto out_free_le; |
| 767 | } |
| 768 | } |
| 769 | |
| 770 | offset = eventreq.lineoffset; |
| 771 | lflags = eventreq.handleflags; |
| 772 | eflags = eventreq.eventflags; |
| 773 | |
Lars-Peter Clausen | b8b0e3d | 2016-10-18 16:54:03 +0200 | [diff] [blame] | 774 | if (offset >= gdev->ngpio) { |
| 775 | ret = -EINVAL; |
| 776 | goto out_free_label; |
| 777 | } |
| 778 | |
Lars-Peter Clausen | ac7dbb9 | 2016-10-18 16:54:06 +0200 | [diff] [blame] | 779 | /* Return an error if a unknown flag is set */ |
| 780 | if ((lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS) || |
| 781 | (eflags & ~GPIOEVENT_REQUEST_VALID_FLAGS)) { |
| 782 | ret = -EINVAL; |
| 783 | goto out_free_label; |
| 784 | } |
| 785 | |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 786 | /* This is just wrong: we don't look for events on output lines */ |
| 787 | if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { |
| 788 | ret = -EINVAL; |
| 789 | goto out_free_label; |
| 790 | } |
| 791 | |
| 792 | desc = &gdev->descs[offset]; |
| 793 | ret = gpiod_request(desc, le->label); |
| 794 | if (ret) |
| 795 | goto out_free_desc; |
| 796 | le->desc = desc; |
| 797 | le->eflags = eflags; |
| 798 | |
| 799 | if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) |
| 800 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); |
| 801 | if (lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) |
| 802 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); |
| 803 | if (lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE) |
| 804 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); |
| 805 | |
| 806 | ret = gpiod_direction_input(desc); |
| 807 | if (ret) |
| 808 | goto out_free_desc; |
| 809 | |
| 810 | le->irq = gpiod_to_irq(desc); |
| 811 | if (le->irq <= 0) { |
| 812 | ret = -ENODEV; |
| 813 | goto out_free_desc; |
| 814 | } |
| 815 | |
| 816 | if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) |
| 817 | irqflags |= IRQF_TRIGGER_RISING; |
| 818 | if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) |
| 819 | irqflags |= IRQF_TRIGGER_FALLING; |
| 820 | irqflags |= IRQF_ONESHOT; |
| 821 | irqflags |= IRQF_SHARED; |
| 822 | |
| 823 | INIT_KFIFO(le->events); |
| 824 | init_waitqueue_head(&le->wait); |
| 825 | mutex_init(&le->read_lock); |
| 826 | |
| 827 | /* Request a thread to read the events */ |
| 828 | ret = request_threaded_irq(le->irq, |
| 829 | NULL, |
| 830 | lineevent_irq_thread, |
| 831 | irqflags, |
| 832 | le->label, |
| 833 | le); |
| 834 | if (ret) |
| 835 | goto out_free_desc; |
| 836 | |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 837 | fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC); |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 838 | if (fd < 0) { |
| 839 | ret = fd; |
| 840 | goto out_free_irq; |
| 841 | } |
| 842 | |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 843 | file = anon_inode_getfile("gpio-event", |
| 844 | &lineevent_fileops, |
| 845 | le, |
| 846 | O_RDONLY | O_CLOEXEC); |
| 847 | if (IS_ERR(file)) { |
| 848 | ret = PTR_ERR(file); |
| 849 | goto out_put_unused_fd; |
| 850 | } |
| 851 | |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 852 | eventreq.fd = fd; |
Linus Walleij | d932cd4 | 2016-07-04 13:13:04 +0200 | [diff] [blame] | 853 | if (copy_to_user(ip, &eventreq, sizeof(eventreq))) { |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 854 | /* |
| 855 | * fput() will trigger the release() callback, so do not go onto |
| 856 | * the regular error cleanup path here. |
| 857 | */ |
| 858 | fput(file); |
| 859 | put_unused_fd(fd); |
| 860 | return -EFAULT; |
Linus Walleij | d932cd4 | 2016-07-04 13:13:04 +0200 | [diff] [blame] | 861 | } |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 862 | |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 863 | fd_install(fd, file); |
| 864 | |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 865 | return 0; |
| 866 | |
Lars-Peter Clausen | 953b956 | 2016-10-24 13:59:15 +0200 | [diff] [blame] | 867 | out_put_unused_fd: |
| 868 | put_unused_fd(fd); |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 869 | out_free_irq: |
| 870 | free_irq(le->irq, le); |
| 871 | out_free_desc: |
| 872 | gpiod_free(le->desc); |
| 873 | out_free_label: |
| 874 | kfree(le->label); |
| 875 | out_free_le: |
| 876 | kfree(le); |
| 877 | put_device(&gdev->dev); |
| 878 | return ret; |
| 879 | } |
| 880 | |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 881 | /** |
| 882 | * gpio_ioctl() - ioctl handler for the GPIO chardev |
| 883 | */ |
| 884 | static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| 885 | { |
| 886 | struct gpio_device *gdev = filp->private_data; |
| 887 | struct gpio_chip *chip = gdev->chip; |
Linus Walleij | 8b92e17 | 2016-05-27 14:24:04 +0200 | [diff] [blame] | 888 | void __user *ip = (void __user *)arg; |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 889 | |
| 890 | /* We fail any subsequent ioctl():s when the chip is gone */ |
| 891 | if (!chip) |
| 892 | return -ENODEV; |
| 893 | |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 894 | /* Fill in the struct and pass to userspace */ |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 895 | if (cmd == GPIO_GET_CHIPINFO_IOCTL) { |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 896 | struct gpiochip_info chipinfo; |
| 897 | |
Lars-Peter Clausen | 0f4bbb2 | 2016-10-18 16:54:00 +0200 | [diff] [blame] | 898 | memset(&chipinfo, 0, sizeof(chipinfo)); |
| 899 | |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 900 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
| 901 | sizeof(chipinfo.name)); |
| 902 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; |
Linus Walleij | df4878e | 2016-02-12 14:48:23 +0100 | [diff] [blame] | 903 | strncpy(chipinfo.label, gdev->label, |
| 904 | sizeof(chipinfo.label)); |
| 905 | chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 906 | chipinfo.lines = gdev->ngpio; |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 907 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
| 908 | return -EFAULT; |
| 909 | return 0; |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 910 | } else if (cmd == GPIO_GET_LINEINFO_IOCTL) { |
| 911 | struct gpioline_info lineinfo; |
| 912 | struct gpio_desc *desc; |
| 913 | |
| 914 | if (copy_from_user(&lineinfo, ip, sizeof(lineinfo))) |
| 915 | return -EFAULT; |
Lars-Peter Clausen | 1f1cc45 | 2016-10-18 16:53:59 +0200 | [diff] [blame] | 916 | if (lineinfo.line_offset >= gdev->ngpio) |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 917 | return -EINVAL; |
| 918 | |
| 919 | desc = &gdev->descs[lineinfo.line_offset]; |
| 920 | if (desc->name) { |
| 921 | strncpy(lineinfo.name, desc->name, |
| 922 | sizeof(lineinfo.name)); |
| 923 | lineinfo.name[sizeof(lineinfo.name)-1] = '\0'; |
| 924 | } else { |
| 925 | lineinfo.name[0] = '\0'; |
| 926 | } |
| 927 | if (desc->label) { |
Linus Walleij | 214338e | 2016-02-25 21:01:48 +0100 | [diff] [blame] | 928 | strncpy(lineinfo.consumer, desc->label, |
| 929 | sizeof(lineinfo.consumer)); |
| 930 | lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0'; |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 931 | } else { |
Linus Walleij | 214338e | 2016-02-25 21:01:48 +0100 | [diff] [blame] | 932 | lineinfo.consumer[0] = '\0'; |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 933 | } |
| 934 | |
| 935 | /* |
| 936 | * Userspace only need to know that the kernel is using |
| 937 | * this GPIO so it can't use it. |
| 938 | */ |
| 939 | lineinfo.flags = 0; |
Linus Walleij | 9d8cc89 | 2016-02-22 13:44:53 +0100 | [diff] [blame] | 940 | if (test_bit(FLAG_REQUESTED, &desc->flags) || |
| 941 | test_bit(FLAG_IS_HOGGED, &desc->flags) || |
| 942 | test_bit(FLAG_USED_AS_IRQ, &desc->flags) || |
| 943 | test_bit(FLAG_EXPORT, &desc->flags) || |
| 944 | test_bit(FLAG_SYSFS, &desc->flags)) |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 945 | lineinfo.flags |= GPIOLINE_FLAG_KERNEL; |
Linus Walleij | 9d8cc89 | 2016-02-22 13:44:53 +0100 | [diff] [blame] | 946 | if (test_bit(FLAG_IS_OUT, &desc->flags)) |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 947 | lineinfo.flags |= GPIOLINE_FLAG_IS_OUT; |
Linus Walleij | 9d8cc89 | 2016-02-22 13:44:53 +0100 | [diff] [blame] | 948 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 949 | lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW; |
Linus Walleij | 9d8cc89 | 2016-02-22 13:44:53 +0100 | [diff] [blame] | 950 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 951 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN; |
Linus Walleij | 9d8cc89 | 2016-02-22 13:44:53 +0100 | [diff] [blame] | 952 | if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
Linus Walleij | 521a2ad | 2016-02-12 22:25:22 +0100 | [diff] [blame] | 953 | lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE; |
| 954 | |
| 955 | if (copy_to_user(ip, &lineinfo, sizeof(lineinfo))) |
| 956 | return -EFAULT; |
| 957 | return 0; |
Linus Walleij | d7c51b4 | 2016-04-26 10:35:29 +0200 | [diff] [blame] | 958 | } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) { |
| 959 | return linehandle_create(gdev, ip); |
Linus Walleij | 61f922d | 2016-06-02 11:30:15 +0200 | [diff] [blame] | 960 | } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) { |
| 961 | return lineevent_create(gdev, ip); |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 962 | } |
| 963 | return -EINVAL; |
| 964 | } |
| 965 | |
Linus Walleij | 8b92e17 | 2016-05-27 14:24:04 +0200 | [diff] [blame] | 966 | #ifdef CONFIG_COMPAT |
| 967 | static long gpio_ioctl_compat(struct file *filp, unsigned int cmd, |
| 968 | unsigned long arg) |
| 969 | { |
| 970 | return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg)); |
| 971 | } |
| 972 | #endif |
| 973 | |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 974 | /** |
| 975 | * gpio_chrdev_open() - open the chardev for ioctl operations |
| 976 | * @inode: inode for this chardev |
| 977 | * @filp: file struct for storing private data |
| 978 | * Returns 0 on success |
| 979 | */ |
| 980 | static int gpio_chrdev_open(struct inode *inode, struct file *filp) |
| 981 | { |
| 982 | struct gpio_device *gdev = container_of(inode->i_cdev, |
| 983 | struct gpio_device, chrdev); |
| 984 | |
| 985 | /* Fail on open if the backing gpiochip is gone */ |
Stephen Boyd | fb50574 | 2017-01-09 11:47:44 -0800 | [diff] [blame] | 986 | if (!gdev->chip) |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 987 | return -ENODEV; |
| 988 | get_device(&gdev->dev); |
| 989 | filp->private_data = gdev; |
Lars-Peter Clausen | f4e81c5 | 2016-11-30 13:05:21 +0100 | [diff] [blame] | 990 | |
| 991 | return nonseekable_open(inode, filp); |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 992 | } |
| 993 | |
| 994 | /** |
| 995 | * gpio_chrdev_release() - close chardev after ioctl operations |
| 996 | * @inode: inode for this chardev |
| 997 | * @filp: file struct for storing private data |
| 998 | * Returns 0 on success |
| 999 | */ |
| 1000 | static int gpio_chrdev_release(struct inode *inode, struct file *filp) |
| 1001 | { |
| 1002 | struct gpio_device *gdev = container_of(inode->i_cdev, |
| 1003 | struct gpio_device, chrdev); |
| 1004 | |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 1005 | put_device(&gdev->dev); |
| 1006 | return 0; |
| 1007 | } |
| 1008 | |
| 1009 | |
| 1010 | static const struct file_operations gpio_fileops = { |
| 1011 | .release = gpio_chrdev_release, |
| 1012 | .open = gpio_chrdev_open, |
| 1013 | .owner = THIS_MODULE, |
Lars-Peter Clausen | f4e81c5 | 2016-11-30 13:05:21 +0100 | [diff] [blame] | 1014 | .llseek = no_llseek, |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 1015 | .unlocked_ioctl = gpio_ioctl, |
Linus Walleij | 8b92e17 | 2016-05-27 14:24:04 +0200 | [diff] [blame] | 1016 | #ifdef CONFIG_COMPAT |
| 1017 | .compat_ioctl = gpio_ioctl_compat, |
| 1018 | #endif |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 1019 | }; |
| 1020 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1021 | static void gpiodevice_release(struct device *dev) |
| 1022 | { |
| 1023 | struct gpio_device *gdev = dev_get_drvdata(dev); |
| 1024 | |
| 1025 | list_del(&gdev->list); |
| 1026 | ida_simple_remove(&gpio_ida, gdev->id); |
Guenter Roeck | 476e2fc | 2016-03-31 08:11:29 -0700 | [diff] [blame] | 1027 | kfree(gdev->label); |
| 1028 | kfree(gdev->descs); |
Linus Walleij | 9efd9e6 | 2016-02-09 14:27:42 +0100 | [diff] [blame] | 1029 | kfree(gdev); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1030 | } |
| 1031 | |
Guenter Roeck | 159f3cd | 2016-03-31 08:11:30 -0700 | [diff] [blame] | 1032 | static int gpiochip_setup_dev(struct gpio_device *gdev) |
| 1033 | { |
| 1034 | int status; |
| 1035 | |
| 1036 | cdev_init(&gdev->chrdev, &gpio_fileops); |
| 1037 | gdev->chrdev.owner = THIS_MODULE; |
| 1038 | gdev->chrdev.kobj.parent = &gdev->dev.kobj; |
| 1039 | gdev->dev.devt = MKDEV(MAJOR(gpio_devt), gdev->id); |
| 1040 | status = cdev_add(&gdev->chrdev, gdev->dev.devt, 1); |
| 1041 | if (status < 0) |
| 1042 | chip_warn(gdev->chip, "failed to add char device %d:%d\n", |
| 1043 | MAJOR(gpio_devt), gdev->id); |
| 1044 | else |
| 1045 | chip_dbg(gdev->chip, "added GPIO chardev (%d:%d)\n", |
| 1046 | MAJOR(gpio_devt), gdev->id); |
| 1047 | status = device_add(&gdev->dev); |
| 1048 | if (status) |
| 1049 | goto err_remove_chardev; |
| 1050 | |
| 1051 | status = gpiochip_sysfs_register(gdev); |
| 1052 | if (status) |
| 1053 | goto err_remove_device; |
| 1054 | |
| 1055 | /* From this point, the .release() function cleans up gpio_device */ |
| 1056 | gdev->dev.release = gpiodevice_release; |
Guenter Roeck | 159f3cd | 2016-03-31 08:11:30 -0700 | [diff] [blame] | 1057 | pr_debug("%s: registered GPIOs %d to %d on device: %s (%s)\n", |
| 1058 | __func__, gdev->base, gdev->base + gdev->ngpio - 1, |
| 1059 | dev_name(&gdev->dev), gdev->chip->label ? : "generic"); |
| 1060 | |
| 1061 | return 0; |
| 1062 | |
| 1063 | err_remove_device: |
| 1064 | device_del(&gdev->dev); |
| 1065 | err_remove_chardev: |
| 1066 | cdev_del(&gdev->chrdev); |
| 1067 | return status; |
| 1068 | } |
| 1069 | |
| 1070 | static void gpiochip_setup_devs(void) |
| 1071 | { |
| 1072 | struct gpio_device *gdev; |
| 1073 | int err; |
| 1074 | |
| 1075 | list_for_each_entry(gdev, &gpio_devices, list) { |
| 1076 | err = gpiochip_setup_dev(gdev); |
| 1077 | if (err) |
| 1078 | pr_err("%s: Failed to initialize gpio device (%d)\n", |
| 1079 | dev_name(&gdev->dev), err); |
| 1080 | } |
| 1081 | } |
| 1082 | |
Anton Vorontsov | 169b6a7 | 2008-04-28 02:14:47 -0700 | [diff] [blame] | 1083 | /** |
Linus Walleij | b08ea35 | 2015-12-03 15:14:13 +0100 | [diff] [blame] | 1084 | * gpiochip_add_data() - register a gpio_chip |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1085 | * @chip: the chip to register, with chip->base initialized |
Alexandre Courbot | 14e85c0 | 2014-11-19 16:51:27 +0900 | [diff] [blame] | 1086 | * Context: potentially before irqs will work |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1087 | * |
| 1088 | * Returns a negative errno if the chip can't be registered, such as |
| 1089 | * because the chip->base is invalid or already associated with a |
| 1090 | * different chip. Otherwise it returns zero as a success code. |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 1091 | * |
Linus Walleij | b08ea35 | 2015-12-03 15:14:13 +0100 | [diff] [blame] | 1092 | * When gpiochip_add_data() is called very early during boot, so that GPIOs |
Bamvor Jian Zhang | c88402c | 2015-11-18 17:07:07 +0800 | [diff] [blame] | 1093 | * can be freely used, the chip->parent device must be registered before |
David Brownell | d8f388d8 | 2008-07-25 01:46:07 -0700 | [diff] [blame] | 1094 | * the gpio framework's arch_initcall(). Otherwise sysfs initialization |
| 1095 | * for GPIOs will fail rudely. |
| 1096 | * |
Guenter Roeck | 159f3cd | 2016-03-31 08:11:30 -0700 | [diff] [blame] | 1097 | * gpiochip_add_data() must only be called after gpiolib initialization, |
| 1098 | * ie after core_initcall(). |
| 1099 | * |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 1100 | * If chip->base is negative, this requests dynamic assignment of |
| 1101 | * a range of valid GPIOs. |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1102 | */ |
Linus Walleij | b08ea35 | 2015-12-03 15:14:13 +0100 | [diff] [blame] | 1103 | int gpiochip_add_data(struct gpio_chip *chip, void *data) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1104 | { |
| 1105 | unsigned long flags; |
| 1106 | int status = 0; |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1107 | unsigned i; |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 1108 | int base = chip->base; |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1109 | struct gpio_device *gdev; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1110 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1111 | /* |
| 1112 | * First: allocate and populate the internal stat container, and |
| 1113 | * set up the struct device. |
| 1114 | */ |
Josh Cartwright | 969f07b | 2016-02-17 16:44:15 -0600 | [diff] [blame] | 1115 | gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1116 | if (!gdev) |
Alexandre Courbot | 14e85c0 | 2014-11-19 16:51:27 +0900 | [diff] [blame] | 1117 | return -ENOMEM; |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 1118 | gdev->dev.bus = &gpio_bus_type; |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1119 | gdev->chip = chip; |
| 1120 | chip->gpiodev = gdev; |
| 1121 | if (chip->parent) { |
| 1122 | gdev->dev.parent = chip->parent; |
| 1123 | gdev->dev.of_node = chip->parent->of_node; |
Thierry Reding | acc6e33 | 2016-07-05 14:11:14 +0200 | [diff] [blame] | 1124 | } |
| 1125 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1126 | #ifdef CONFIG_OF_GPIO |
| 1127 | /* If the gpiochip has an assigned OF node this takes precedence */ |
Thierry Reding | acc6e33 | 2016-07-05 14:11:14 +0200 | [diff] [blame] | 1128 | if (chip->of_node) |
| 1129 | gdev->dev.of_node = chip->of_node; |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1130 | #endif |
Thierry Reding | acc6e33 | 2016-07-05 14:11:14 +0200 | [diff] [blame] | 1131 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1132 | gdev->id = ida_simple_get(&gpio_ida, 0, 0, GFP_KERNEL); |
| 1133 | if (gdev->id < 0) { |
| 1134 | status = gdev->id; |
| 1135 | goto err_free_gdev; |
| 1136 | } |
| 1137 | dev_set_name(&gdev->dev, "gpiochip%d", gdev->id); |
| 1138 | device_initialize(&gdev->dev); |
| 1139 | dev_set_drvdata(&gdev->dev, gdev); |
| 1140 | if (chip->parent && chip->parent->driver) |
| 1141 | gdev->owner = chip->parent->driver->owner; |
| 1142 | else if (chip->owner) |
| 1143 | /* TODO: remove chip->owner */ |
| 1144 | gdev->owner = chip->owner; |
| 1145 | else |
| 1146 | gdev->owner = THIS_MODULE; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1147 | |
Guenter Roeck | 476e2fc | 2016-03-31 08:11:29 -0700 | [diff] [blame] | 1148 | gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
Linus Walleij | 1c3cdb1 | 2016-02-09 13:51:59 +0100 | [diff] [blame] | 1149 | if (!gdev->descs) { |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1150 | status = -ENOMEM; |
| 1151 | goto err_free_gdev; |
| 1152 | } |
| 1153 | |
Bamvor Jian Zhang | 5ed41cc | 2015-11-16 13:02:47 +0800 | [diff] [blame] | 1154 | if (chip->ngpio == 0) { |
| 1155 | chip_err(chip, "tried to insert a GPIO chip with zero lines\n"); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1156 | status = -EINVAL; |
Guenter Roeck | 159f3cd | 2016-03-31 08:11:30 -0700 | [diff] [blame] | 1157 | goto err_free_descs; |
Bamvor Jian Zhang | 5ed41cc | 2015-11-16 13:02:47 +0800 | [diff] [blame] | 1158 | } |
Linus Walleij | df4878e | 2016-02-12 14:48:23 +0100 | [diff] [blame] | 1159 | |
| 1160 | if (chip->label) |
Guenter Roeck | 476e2fc | 2016-03-31 08:11:29 -0700 | [diff] [blame] | 1161 | gdev->label = kstrdup(chip->label, GFP_KERNEL); |
Linus Walleij | df4878e | 2016-02-12 14:48:23 +0100 | [diff] [blame] | 1162 | else |
Guenter Roeck | 476e2fc | 2016-03-31 08:11:29 -0700 | [diff] [blame] | 1163 | gdev->label = kstrdup("unknown", GFP_KERNEL); |
Linus Walleij | df4878e | 2016-02-12 14:48:23 +0100 | [diff] [blame] | 1164 | if (!gdev->label) { |
| 1165 | status = -ENOMEM; |
Guenter Roeck | 476e2fc | 2016-03-31 08:11:29 -0700 | [diff] [blame] | 1166 | goto err_free_descs; |
Linus Walleij | df4878e | 2016-02-12 14:48:23 +0100 | [diff] [blame] | 1167 | } |
| 1168 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1169 | gdev->ngpio = chip->ngpio; |
Linus Walleij | 43c54ec | 2016-02-11 11:37:48 +0100 | [diff] [blame] | 1170 | gdev->data = data; |
Bamvor Jian Zhang | 5ed41cc | 2015-11-16 13:02:47 +0800 | [diff] [blame] | 1171 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1172 | spin_lock_irqsave(&gpio_lock, flags); |
| 1173 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1174 | /* |
| 1175 | * TODO: this allocates a Linux GPIO number base in the global |
| 1176 | * GPIO numberspace for this chip. In the long run we want to |
| 1177 | * get *rid* of this numberspace and use only descriptors, but |
| 1178 | * it may be a pipe dream. It will not happen before we get rid |
| 1179 | * of the sysfs interface anyways. |
| 1180 | */ |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 1181 | if (base < 0) { |
| 1182 | base = gpiochip_find_base(chip->ngpio); |
| 1183 | if (base < 0) { |
| 1184 | status = base; |
Johan Hovold | 225fce8 | 2015-01-12 17:12:25 +0100 | [diff] [blame] | 1185 | spin_unlock_irqrestore(&gpio_lock, flags); |
Guenter Roeck | 476e2fc | 2016-03-31 08:11:29 -0700 | [diff] [blame] | 1186 | goto err_free_label; |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 1187 | } |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1188 | /* |
| 1189 | * TODO: it should not be necessary to reflect the assigned |
| 1190 | * base outside of the GPIO subsystem. Go over drivers and |
| 1191 | * see if anyone makes use of this, else drop this and assign |
| 1192 | * a poison instead. |
| 1193 | */ |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 1194 | chip->base = base; |
| 1195 | } |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1196 | gdev->base = base; |
Anton Vorontsov | 8d0aab2 | 2008-04-28 02:14:46 -0700 | [diff] [blame] | 1197 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1198 | status = gpiodev_add_to_list(gdev); |
Johan Hovold | 05aa520 | 2015-01-12 17:12:26 +0100 | [diff] [blame] | 1199 | if (status) { |
| 1200 | spin_unlock_irqrestore(&gpio_lock, flags); |
Guenter Roeck | 476e2fc | 2016-03-31 08:11:29 -0700 | [diff] [blame] | 1201 | goto err_free_label; |
Johan Hovold | 05aa520 | 2015-01-12 17:12:26 +0100 | [diff] [blame] | 1202 | } |
Alexandre Courbot | 1a989d0 | 2013-02-03 01:29:24 +0900 | [diff] [blame] | 1203 | |
Linus Walleij | 545ebd9 | 2016-05-30 17:11:59 +0200 | [diff] [blame] | 1204 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 1205 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1206 | for (i = 0; i < chip->ngpio; i++) { |
Linus Walleij | 1c3cdb1 | 2016-02-09 13:51:59 +0100 | [diff] [blame] | 1207 | struct gpio_desc *desc = &gdev->descs[i]; |
David Brownell | d8f388d8 | 2008-07-25 01:46:07 -0700 | [diff] [blame] | 1208 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1209 | desc->gdev = gdev; |
Linus Walleij | 72d3200 | 2016-04-28 13:33:59 +0200 | [diff] [blame] | 1210 | /* |
| 1211 | * REVISIT: most hardware initializes GPIOs as inputs |
| 1212 | * (often with pullups enabled) so power usage is |
| 1213 | * minimized. Linux code should set the gpio direction |
| 1214 | * first thing; but until it does, and in case |
| 1215 | * chip->get_direction is not set, we may expose the |
| 1216 | * wrong direction in sysfs. |
Johan Hovold | 05aa520 | 2015-01-12 17:12:26 +0100 | [diff] [blame] | 1217 | */ |
Linus Walleij | 72d3200 | 2016-04-28 13:33:59 +0200 | [diff] [blame] | 1218 | |
| 1219 | if (chip->get_direction) { |
| 1220 | /* |
| 1221 | * If we have .get_direction, set up the initial |
| 1222 | * direction flag from the hardware. |
| 1223 | */ |
| 1224 | int dir = chip->get_direction(chip, i); |
| 1225 | |
| 1226 | if (!dir) |
| 1227 | set_bit(FLAG_IS_OUT, &desc->flags); |
| 1228 | } else if (!chip->direction_input) { |
| 1229 | /* |
| 1230 | * If the chip lacks the .direction_input callback |
| 1231 | * we logically assume all lines are outputs. |
| 1232 | */ |
| 1233 | set_bit(FLAG_IS_OUT, &desc->flags); |
| 1234 | } |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1235 | } |
Alexandre Courbot | 14e85c0 | 2014-11-19 16:51:27 +0900 | [diff] [blame] | 1236 | |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1237 | #ifdef CONFIG_PINCTRL |
Linus Walleij | 20ec3e3 | 2016-02-11 11:03:06 +0100 | [diff] [blame] | 1238 | INIT_LIST_HEAD(&gdev->pin_ranges); |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1239 | #endif |
| 1240 | |
Markus Pargmann | 5f3ca73 | 2015-08-14 16:11:00 +0200 | [diff] [blame] | 1241 | status = gpiochip_set_desc_names(chip); |
| 1242 | if (status) |
| 1243 | goto err_remove_from_list; |
| 1244 | |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1245 | status = gpiochip_irqchip_init_valid_mask(chip); |
| 1246 | if (status) |
| 1247 | goto err_remove_from_list; |
| 1248 | |
Tomeu Vizoso | 28355f8 | 2015-07-14 10:29:54 +0200 | [diff] [blame] | 1249 | status = of_gpiochip_add(chip); |
| 1250 | if (status) |
| 1251 | goto err_remove_chip; |
| 1252 | |
Mika Westerberg | 664e3e5 | 2014-01-08 12:40:54 +0200 | [diff] [blame] | 1253 | acpi_gpiochip_add(chip); |
Anton Vorontsov | 391c970 | 2010-06-08 07:48:17 -0600 | [diff] [blame] | 1254 | |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 1255 | /* |
| 1256 | * By first adding the chardev, and then adding the device, |
| 1257 | * we get a device node entry in sysfs under |
| 1258 | * /sys/bus/gpio/devices/gpiochipN/dev that can be used for |
| 1259 | * coldplug of device nodes and other udev business. |
Guenter Roeck | 159f3cd | 2016-03-31 08:11:30 -0700 | [diff] [blame] | 1260 | * We can do this only if gpiolib has been initialized. |
| 1261 | * Otherwise, defer until later. |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 1262 | */ |
Guenter Roeck | 159f3cd | 2016-03-31 08:11:30 -0700 | [diff] [blame] | 1263 | if (gpiolib_initialized) { |
| 1264 | status = gpiochip_setup_dev(gdev); |
| 1265 | if (status) |
| 1266 | goto err_remove_chip; |
| 1267 | } |
Anton Vorontsov | cedb188 | 2010-06-08 07:48:15 -0600 | [diff] [blame] | 1268 | return 0; |
Zhangfei Gao | 3bae481 | 2013-06-09 11:08:32 +0800 | [diff] [blame] | 1269 | |
Johan Hovold | 225fce8 | 2015-01-12 17:12:25 +0100 | [diff] [blame] | 1270 | err_remove_chip: |
| 1271 | acpi_gpiochip_remove(chip); |
Johan Hovold | 6d86750 | 2015-05-04 17:23:25 +0200 | [diff] [blame] | 1272 | gpiochip_free_hogs(chip); |
Johan Hovold | 225fce8 | 2015-01-12 17:12:25 +0100 | [diff] [blame] | 1273 | of_gpiochip_remove(chip); |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1274 | gpiochip_irqchip_free_valid_mask(chip); |
Markus Pargmann | 5f3ca73 | 2015-08-14 16:11:00 +0200 | [diff] [blame] | 1275 | err_remove_from_list: |
Johan Hovold | 225fce8 | 2015-01-12 17:12:25 +0100 | [diff] [blame] | 1276 | spin_lock_irqsave(&gpio_lock, flags); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1277 | list_del(&gdev->list); |
Zhangfei Gao | 3bae481 | 2013-06-09 11:08:32 +0800 | [diff] [blame] | 1278 | spin_unlock_irqrestore(&gpio_lock, flags); |
Guenter Roeck | 476e2fc | 2016-03-31 08:11:29 -0700 | [diff] [blame] | 1279 | err_free_label: |
| 1280 | kfree(gdev->label); |
| 1281 | err_free_descs: |
| 1282 | kfree(gdev->descs); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1283 | err_free_gdev: |
| 1284 | ida_simple_remove(&gpio_ida, gdev->id); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1285 | /* failures here can mean systems won't boot... */ |
Andy Shevchenko | 7589e59 | 2013-12-05 11:26:23 +0200 | [diff] [blame] | 1286 | pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__, |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1287 | gdev->base, gdev->base + gdev->ngpio - 1, |
| 1288 | chip->label ? : "generic"); |
| 1289 | kfree(gdev); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1290 | return status; |
| 1291 | } |
Linus Walleij | b08ea35 | 2015-12-03 15:14:13 +0100 | [diff] [blame] | 1292 | EXPORT_SYMBOL_GPL(gpiochip_add_data); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1293 | |
| 1294 | /** |
Linus Walleij | 43c54ec | 2016-02-11 11:37:48 +0100 | [diff] [blame] | 1295 | * gpiochip_get_data() - get per-subdriver data for the chip |
| 1296 | */ |
| 1297 | void *gpiochip_get_data(struct gpio_chip *chip) |
| 1298 | { |
| 1299 | return chip->gpiodev->data; |
| 1300 | } |
| 1301 | EXPORT_SYMBOL_GPL(gpiochip_get_data); |
| 1302 | |
| 1303 | /** |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1304 | * gpiochip_remove() - unregister a gpio_chip |
| 1305 | * @chip: the chip to unregister |
| 1306 | * |
| 1307 | * A gpio_chip with any GPIOs still requested may not be removed. |
| 1308 | */ |
abdoulaye berthe | e1db170 | 2014-07-05 18:28:50 +0200 | [diff] [blame] | 1309 | void gpiochip_remove(struct gpio_chip *chip) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1310 | { |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1311 | struct gpio_device *gdev = chip->gpiodev; |
Johan Hovold | fab28b8 | 2015-05-04 17:10:27 +0200 | [diff] [blame] | 1312 | struct gpio_desc *desc; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1313 | unsigned long flags; |
Linus Walleij | 1c3cdb1 | 2016-02-09 13:51:59 +0100 | [diff] [blame] | 1314 | unsigned i; |
Johan Hovold | fab28b8 | 2015-05-04 17:10:27 +0200 | [diff] [blame] | 1315 | bool requested = false; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1316 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1317 | /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
Linus Walleij | afbc4f3 | 2016-02-09 13:21:06 +0100 | [diff] [blame] | 1318 | gpiochip_sysfs_unregister(gdev); |
Geert Uytterhoeven | 5018ada | 2016-12-19 18:29:23 +0100 | [diff] [blame] | 1319 | gpiochip_free_hogs(chip); |
Bamvor Jian Zhang | bd203bd | 2016-02-20 13:13:19 +0800 | [diff] [blame] | 1320 | /* Numb the device, cancelling all outstanding operations */ |
| 1321 | gdev->chip = NULL; |
Johan Hovold | 00acc3d | 2015-01-12 17:12:27 +0100 | [diff] [blame] | 1322 | gpiochip_irqchip_remove(chip); |
Mika Westerberg | 6072b9d | 2014-03-10 14:54:53 +0200 | [diff] [blame] | 1323 | acpi_gpiochip_remove(chip); |
Linus Walleij | 9ef0d6f | 2012-11-06 15:15:44 +0100 | [diff] [blame] | 1324 | gpiochip_remove_pin_ranges(chip); |
Anton Vorontsov | 391c970 | 2010-06-08 07:48:17 -0600 | [diff] [blame] | 1325 | of_gpiochip_remove(chip); |
Linus Walleij | 43c54ec | 2016-02-11 11:37:48 +0100 | [diff] [blame] | 1326 | /* |
| 1327 | * We accept no more calls into the driver from this point, so |
| 1328 | * NULL the driver data pointer |
| 1329 | */ |
| 1330 | gdev->data = NULL; |
Anton Vorontsov | 391c970 | 2010-06-08 07:48:17 -0600 | [diff] [blame] | 1331 | |
Johan Hovold | 6798aca | 2015-01-12 17:12:28 +0100 | [diff] [blame] | 1332 | spin_lock_irqsave(&gpio_lock, flags); |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1333 | for (i = 0; i < gdev->ngpio; i++) { |
Linus Walleij | 1c3cdb1 | 2016-02-09 13:51:59 +0100 | [diff] [blame] | 1334 | desc = &gdev->descs[i]; |
Johan Hovold | fab28b8 | 2015-05-04 17:10:27 +0200 | [diff] [blame] | 1335 | if (test_bit(FLAG_REQUESTED, &desc->flags)) |
| 1336 | requested = true; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1337 | } |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1338 | spin_unlock_irqrestore(&gpio_lock, flags); |
Alexandre Courbot | 14e85c0 | 2014-11-19 16:51:27 +0900 | [diff] [blame] | 1339 | |
Johan Hovold | fab28b8 | 2015-05-04 17:10:27 +0200 | [diff] [blame] | 1340 | if (requested) |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1341 | dev_crit(&gdev->dev, |
Linus Walleij | 58383c78 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 1342 | "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
Johan Hovold | fab28b8 | 2015-05-04 17:10:27 +0200 | [diff] [blame] | 1343 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1344 | /* |
| 1345 | * The gpiochip side puts its use of the device to rest here: |
| 1346 | * if there are no userspace clients, the chardev and device will |
| 1347 | * be removed, else it will be dangling until the last user is |
| 1348 | * gone. |
| 1349 | */ |
Ricardo Ribalda Delgado | f4833b8 | 2016-06-03 19:10:02 +0200 | [diff] [blame] | 1350 | cdev_del(&gdev->chrdev); |
| 1351 | device_del(&gdev->dev); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1352 | put_device(&gdev->dev); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1353 | } |
| 1354 | EXPORT_SYMBOL_GPL(gpiochip_remove); |
| 1355 | |
Laxman Dewangan | 0cf3292 | 2016-02-15 16:32:09 +0530 | [diff] [blame] | 1356 | static void devm_gpio_chip_release(struct device *dev, void *res) |
| 1357 | { |
| 1358 | struct gpio_chip *chip = *(struct gpio_chip **)res; |
| 1359 | |
| 1360 | gpiochip_remove(chip); |
| 1361 | } |
| 1362 | |
| 1363 | static int devm_gpio_chip_match(struct device *dev, void *res, void *data) |
| 1364 | |
| 1365 | { |
| 1366 | struct gpio_chip **r = res; |
| 1367 | |
| 1368 | if (!r || !*r) { |
| 1369 | WARN_ON(!r || !*r); |
| 1370 | return 0; |
| 1371 | } |
| 1372 | |
| 1373 | return *r == data; |
| 1374 | } |
| 1375 | |
| 1376 | /** |
| 1377 | * devm_gpiochip_add_data() - Resource manager piochip_add_data() |
| 1378 | * @dev: the device pointer on which irq_chip belongs to. |
| 1379 | * @chip: the chip to register, with chip->base initialized |
| 1380 | * Context: potentially before irqs will work |
| 1381 | * |
| 1382 | * Returns a negative errno if the chip can't be registered, such as |
| 1383 | * because the chip->base is invalid or already associated with a |
| 1384 | * different chip. Otherwise it returns zero as a success code. |
| 1385 | * |
| 1386 | * The gpio chip automatically be released when the device is unbound. |
| 1387 | */ |
| 1388 | int devm_gpiochip_add_data(struct device *dev, struct gpio_chip *chip, |
| 1389 | void *data) |
| 1390 | { |
| 1391 | struct gpio_chip **ptr; |
| 1392 | int ret; |
| 1393 | |
| 1394 | ptr = devres_alloc(devm_gpio_chip_release, sizeof(*ptr), |
| 1395 | GFP_KERNEL); |
| 1396 | if (!ptr) |
| 1397 | return -ENOMEM; |
| 1398 | |
| 1399 | ret = gpiochip_add_data(chip, data); |
| 1400 | if (ret < 0) { |
| 1401 | devres_free(ptr); |
| 1402 | return ret; |
| 1403 | } |
| 1404 | |
| 1405 | *ptr = chip; |
| 1406 | devres_add(dev, ptr); |
| 1407 | |
| 1408 | return 0; |
| 1409 | } |
| 1410 | EXPORT_SYMBOL_GPL(devm_gpiochip_add_data); |
| 1411 | |
| 1412 | /** |
| 1413 | * devm_gpiochip_remove() - Resource manager of gpiochip_remove() |
| 1414 | * @dev: device for which which resource was allocated |
| 1415 | * @chip: the chip to remove |
| 1416 | * |
| 1417 | * A gpio_chip with any GPIOs still requested may not be removed. |
| 1418 | */ |
| 1419 | void devm_gpiochip_remove(struct device *dev, struct gpio_chip *chip) |
| 1420 | { |
| 1421 | int ret; |
| 1422 | |
| 1423 | ret = devres_release(dev, devm_gpio_chip_release, |
| 1424 | devm_gpio_chip_match, chip); |
Christophe JAILLET | 3988d66 | 2017-01-27 12:56:42 +0100 | [diff] [blame] | 1425 | WARN_ON(ret); |
Laxman Dewangan | 0cf3292 | 2016-02-15 16:32:09 +0530 | [diff] [blame] | 1426 | } |
| 1427 | EXPORT_SYMBOL_GPL(devm_gpiochip_remove); |
| 1428 | |
Grant Likely | 594fa26 | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 1429 | /** |
| 1430 | * gpiochip_find() - iterator for locating a specific gpio_chip |
| 1431 | * @data: data to pass to match function |
| 1432 | * @callback: Callback function to check gpio_chip |
| 1433 | * |
| 1434 | * Similar to bus_find_device. It returns a reference to a gpio_chip as |
| 1435 | * determined by a user supplied @match callback. The callback should return |
| 1436 | * 0 if the device doesn't match and non-zero if it does. If the callback is |
| 1437 | * non-zero, this function will return to the caller and not iterate over any |
| 1438 | * more gpio_chips. |
| 1439 | */ |
Grant Likely | 07ce8ec | 2012-05-18 23:01:05 -0600 | [diff] [blame] | 1440 | struct gpio_chip *gpiochip_find(void *data, |
Grant Likely | 6e2cf65 | 2012-03-02 15:56:03 -0700 | [diff] [blame] | 1441 | int (*match)(struct gpio_chip *chip, |
Grant Likely | 3d0f7cf | 2012-05-17 13:54:40 -0600 | [diff] [blame] | 1442 | void *data)) |
Grant Likely | 594fa26 | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 1443 | { |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1444 | struct gpio_device *gdev; |
Masahiro Yamada | acf06ff | 2016-08-12 01:21:58 +0900 | [diff] [blame] | 1445 | struct gpio_chip *chip = NULL; |
Grant Likely | 594fa26 | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 1446 | unsigned long flags; |
Grant Likely | 594fa26 | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 1447 | |
| 1448 | spin_lock_irqsave(&gpio_lock, flags); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1449 | list_for_each_entry(gdev, &gpio_devices, list) |
Masahiro Yamada | acf06ff | 2016-08-12 01:21:58 +0900 | [diff] [blame] | 1450 | if (gdev->chip && match(gdev->chip, data)) { |
| 1451 | chip = gdev->chip; |
Grant Likely | 594fa26 | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 1452 | break; |
Masahiro Yamada | acf06ff | 2016-08-12 01:21:58 +0900 | [diff] [blame] | 1453 | } |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1454 | |
Grant Likely | 594fa26 | 2010-06-08 07:48:16 -0600 | [diff] [blame] | 1455 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 1456 | |
| 1457 | return chip; |
| 1458 | } |
Jean Delvare | 8fa0c9b | 2011-05-20 00:40:18 -0600 | [diff] [blame] | 1459 | EXPORT_SYMBOL_GPL(gpiochip_find); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 1460 | |
Alexandre Courbot | 79697ef | 2013-11-16 21:39:32 +0900 | [diff] [blame] | 1461 | static int gpiochip_match_name(struct gpio_chip *chip, void *data) |
| 1462 | { |
| 1463 | const char *name = data; |
| 1464 | |
| 1465 | return !strcmp(chip->label, name); |
| 1466 | } |
| 1467 | |
| 1468 | static struct gpio_chip *find_chip_by_name(const char *name) |
| 1469 | { |
| 1470 | return gpiochip_find((void *)name, gpiochip_match_name); |
| 1471 | } |
| 1472 | |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1473 | #ifdef CONFIG_GPIOLIB_IRQCHIP |
| 1474 | |
| 1475 | /* |
| 1476 | * The following is irqchip helper code for gpiochips. |
| 1477 | */ |
| 1478 | |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1479 | static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
| 1480 | { |
| 1481 | int i; |
| 1482 | |
| 1483 | if (!gpiochip->irq_need_valid_mask) |
| 1484 | return 0; |
| 1485 | |
| 1486 | gpiochip->irq_valid_mask = kcalloc(BITS_TO_LONGS(gpiochip->ngpio), |
| 1487 | sizeof(long), GFP_KERNEL); |
| 1488 | if (!gpiochip->irq_valid_mask) |
| 1489 | return -ENOMEM; |
| 1490 | |
| 1491 | /* Assume by default all GPIOs are valid */ |
| 1492 | for (i = 0; i < gpiochip->ngpio; i++) |
| 1493 | set_bit(i, gpiochip->irq_valid_mask); |
| 1494 | |
| 1495 | return 0; |
| 1496 | } |
| 1497 | |
| 1498 | static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) |
| 1499 | { |
| 1500 | kfree(gpiochip->irq_valid_mask); |
| 1501 | gpiochip->irq_valid_mask = NULL; |
| 1502 | } |
| 1503 | |
| 1504 | static bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gpiochip, |
| 1505 | unsigned int offset) |
| 1506 | { |
| 1507 | /* No mask means all valid */ |
| 1508 | if (likely(!gpiochip->irq_valid_mask)) |
| 1509 | return true; |
| 1510 | return test_bit(offset, gpiochip->irq_valid_mask); |
| 1511 | } |
| 1512 | |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1513 | /** |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1514 | * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip |
Linus Walleij | 3f97d5fc | 2014-09-26 14:19:52 +0200 | [diff] [blame] | 1515 | * @gpiochip: the gpiochip to set the irqchip chain to |
| 1516 | * @irqchip: the irqchip to chain to the gpiochip |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1517 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
| 1518 | * chained irqchip |
| 1519 | * @parent_handler: the parent interrupt handler for the accumulated IRQ |
Linus Walleij | 3f97d5fc | 2014-09-26 14:19:52 +0200 | [diff] [blame] | 1520 | * coming out of the gpiochip. If the interrupt is nested rather than |
| 1521 | * cascaded, pass NULL in this handler argument |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1522 | */ |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1523 | static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip, |
| 1524 | struct irq_chip *irqchip, |
Thierry Reding | 6f79309 | 2017-04-03 18:05:21 +0200 | [diff] [blame^] | 1525 | unsigned int parent_irq, |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1526 | irq_flow_handler_t parent_handler) |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1527 | { |
Linus Walleij | 83141a7 | 2014-09-26 13:50:12 +0200 | [diff] [blame] | 1528 | unsigned int offset; |
| 1529 | |
Linus Walleij | 83141a7 | 2014-09-26 13:50:12 +0200 | [diff] [blame] | 1530 | if (!gpiochip->irqdomain) { |
| 1531 | chip_err(gpiochip, "called %s before setting up irqchip\n", |
| 1532 | __func__); |
Linus Walleij | 1c8732b | 2014-04-09 13:34:39 +0200 | [diff] [blame] | 1533 | return; |
| 1534 | } |
| 1535 | |
Linus Walleij | 3f97d5fc | 2014-09-26 14:19:52 +0200 | [diff] [blame] | 1536 | if (parent_handler) { |
| 1537 | if (gpiochip->can_sleep) { |
| 1538 | chip_err(gpiochip, |
| 1539 | "you cannot have chained interrupts on a " |
| 1540 | "chip that may sleep\n"); |
| 1541 | return; |
| 1542 | } |
Linus Walleij | 3f97d5fc | 2014-09-26 14:19:52 +0200 | [diff] [blame] | 1543 | /* |
| 1544 | * The parent irqchip is already using the chip_data for this |
| 1545 | * irqchip, so our callbacks simply use the handler_data. |
| 1546 | */ |
Thomas Gleixner | f7f8775 | 2015-06-21 21:10:48 +0200 | [diff] [blame] | 1547 | irq_set_chained_handler_and_data(parent_irq, parent_handler, |
| 1548 | gpiochip); |
Dmitry Eremin-Solenikov | 25e4fe9 | 2015-05-12 20:12:23 +0300 | [diff] [blame] | 1549 | |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1550 | gpiochip->irq_chained_parent = parent_irq; |
Linus Walleij | 3f97d5fc | 2014-09-26 14:19:52 +0200 | [diff] [blame] | 1551 | } |
Linus Walleij | 83141a7 | 2014-09-26 13:50:12 +0200 | [diff] [blame] | 1552 | |
| 1553 | /* Set the parent IRQ for all affected IRQs */ |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1554 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
| 1555 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) |
| 1556 | continue; |
Linus Walleij | 83141a7 | 2014-09-26 13:50:12 +0200 | [diff] [blame] | 1557 | irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset), |
| 1558 | parent_irq); |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1559 | } |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1560 | } |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1561 | |
| 1562 | /** |
| 1563 | * gpiochip_set_chained_irqchip() - connects a chained irqchip to a gpiochip |
| 1564 | * @gpiochip: the gpiochip to set the irqchip chain to |
| 1565 | * @irqchip: the irqchip to chain to the gpiochip |
| 1566 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
| 1567 | * chained irqchip |
| 1568 | * @parent_handler: the parent interrupt handler for the accumulated IRQ |
| 1569 | * coming out of the gpiochip. If the interrupt is nested rather than |
| 1570 | * cascaded, pass NULL in this handler argument |
| 1571 | */ |
| 1572 | void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip, |
| 1573 | struct irq_chip *irqchip, |
Thierry Reding | 6f79309 | 2017-04-03 18:05:21 +0200 | [diff] [blame^] | 1574 | unsigned int parent_irq, |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1575 | irq_flow_handler_t parent_handler) |
| 1576 | { |
| 1577 | gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, |
| 1578 | parent_handler); |
| 1579 | } |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1580 | EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip); |
| 1581 | |
| 1582 | /** |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1583 | * gpiochip_set_nested_irqchip() - connects a nested irqchip to a gpiochip |
| 1584 | * @gpiochip: the gpiochip to set the irqchip nested handler to |
| 1585 | * @irqchip: the irqchip to nest to the gpiochip |
| 1586 | * @parent_irq: the irq number corresponding to the parent IRQ for this |
| 1587 | * nested irqchip |
| 1588 | */ |
| 1589 | void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip, |
| 1590 | struct irq_chip *irqchip, |
Thierry Reding | 6f79309 | 2017-04-03 18:05:21 +0200 | [diff] [blame^] | 1591 | unsigned int parent_irq) |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1592 | { |
| 1593 | if (!gpiochip->irq_nested) { |
| 1594 | chip_err(gpiochip, "tried to nest a chained gpiochip\n"); |
| 1595 | return; |
| 1596 | } |
| 1597 | gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq, |
| 1598 | NULL); |
| 1599 | } |
| 1600 | EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip); |
| 1601 | |
| 1602 | /** |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1603 | * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip |
| 1604 | * @d: the irqdomain used by this irqchip |
| 1605 | * @irq: the global irq number used by this GPIO irqchip irq |
| 1606 | * @hwirq: the local IRQ/GPIO line offset on this gpiochip |
| 1607 | * |
| 1608 | * This function will set up the mapping for a certain IRQ line on a |
| 1609 | * gpiochip by assigning the gpiochip as chip data, and using the irqchip |
| 1610 | * stored inside the gpiochip. |
| 1611 | */ |
| 1612 | static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, |
| 1613 | irq_hw_number_t hwirq) |
| 1614 | { |
| 1615 | struct gpio_chip *chip = d->host_data; |
| 1616 | |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1617 | irq_set_chip_data(irq, chip); |
Grygorii Strashko | a0a8bcf | 2015-08-17 15:35:23 +0300 | [diff] [blame] | 1618 | /* |
| 1619 | * This lock class tells lockdep that GPIO irqs are in a different |
| 1620 | * category than their parents, so it won't report false recursion. |
| 1621 | */ |
| 1622 | irq_set_lockdep_class(irq, chip->lock_key); |
Linus Walleij | 7633fb9 | 2014-04-09 13:20:38 +0200 | [diff] [blame] | 1623 | irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler); |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1624 | /* Chips that use nested thread handlers have them marked */ |
| 1625 | if (chip->irq_nested) |
Linus Walleij | 1c8732b | 2014-04-09 13:34:39 +0200 | [diff] [blame] | 1626 | irq_set_nested_thread(irq, 1); |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1627 | irq_set_noprobe(irq); |
Rob Herring | 23393d4 | 2015-07-27 15:55:16 -0500 | [diff] [blame] | 1628 | |
Linus Walleij | 1333b90 | 2014-04-23 16:45:12 +0200 | [diff] [blame] | 1629 | /* |
| 1630 | * No set-up of the hardware will happen if IRQ_TYPE_NONE |
| 1631 | * is passed as default type. |
| 1632 | */ |
| 1633 | if (chip->irq_default_type != IRQ_TYPE_NONE) |
| 1634 | irq_set_irq_type(irq, chip->irq_default_type); |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1635 | |
| 1636 | return 0; |
| 1637 | } |
| 1638 | |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1639 | static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
| 1640 | { |
Linus Walleij | 1c8732b | 2014-04-09 13:34:39 +0200 | [diff] [blame] | 1641 | struct gpio_chip *chip = d->host_data; |
| 1642 | |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1643 | if (chip->irq_nested) |
Linus Walleij | 1c8732b | 2014-04-09 13:34:39 +0200 | [diff] [blame] | 1644 | irq_set_nested_thread(irq, 0); |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1645 | irq_set_chip_and_handler(irq, NULL, NULL); |
| 1646 | irq_set_chip_data(irq, NULL); |
| 1647 | } |
| 1648 | |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1649 | static const struct irq_domain_ops gpiochip_domain_ops = { |
| 1650 | .map = gpiochip_irq_map, |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1651 | .unmap = gpiochip_irq_unmap, |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1652 | /* Virtually all GPIO irqchips are twocell:ed */ |
| 1653 | .xlate = irq_domain_xlate_twocell, |
| 1654 | }; |
| 1655 | |
| 1656 | static int gpiochip_irq_reqres(struct irq_data *d) |
| 1657 | { |
| 1658 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); |
| 1659 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1660 | if (!try_module_get(chip->gpiodev->owner)) |
Grygorii Strashko | 5b76e79 | 2015-06-25 20:30:50 +0300 | [diff] [blame] | 1661 | return -ENODEV; |
| 1662 | |
Alexandre Courbot | e3a2e87 | 2014-10-23 17:27:07 +0900 | [diff] [blame] | 1663 | if (gpiochip_lock_as_irq(chip, d->hwirq)) { |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1664 | chip_err(chip, |
| 1665 | "unable to lock HW IRQ %lu for IRQ\n", |
| 1666 | d->hwirq); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1667 | module_put(chip->gpiodev->owner); |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1668 | return -EINVAL; |
| 1669 | } |
| 1670 | return 0; |
| 1671 | } |
| 1672 | |
| 1673 | static void gpiochip_irq_relres(struct irq_data *d) |
| 1674 | { |
| 1675 | struct gpio_chip *chip = irq_data_get_irq_chip_data(d); |
| 1676 | |
Alexandre Courbot | e3a2e87 | 2014-10-23 17:27:07 +0900 | [diff] [blame] | 1677 | gpiochip_unlock_as_irq(chip, d->hwirq); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 1678 | module_put(chip->gpiodev->owner); |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1679 | } |
| 1680 | |
| 1681 | static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset) |
| 1682 | { |
| 1683 | return irq_find_mapping(chip->irqdomain, offset); |
| 1684 | } |
| 1685 | |
| 1686 | /** |
| 1687 | * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip |
| 1688 | * @gpiochip: the gpiochip to remove the irqchip from |
| 1689 | * |
| 1690 | * This is called only from gpiochip_remove() |
| 1691 | */ |
| 1692 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) |
| 1693 | { |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1694 | unsigned int offset; |
| 1695 | |
Mika Westerberg | afa82fa | 2014-07-25 09:54:48 +0300 | [diff] [blame] | 1696 | acpi_gpiochip_free_interrupts(gpiochip); |
| 1697 | |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1698 | if (gpiochip->irq_chained_parent) { |
| 1699 | irq_set_chained_handler(gpiochip->irq_chained_parent, NULL); |
| 1700 | irq_set_handler_data(gpiochip->irq_chained_parent, NULL); |
Dmitry Eremin-Solenikov | 25e4fe9 | 2015-05-12 20:12:23 +0300 | [diff] [blame] | 1701 | } |
| 1702 | |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1703 | /* Remove all IRQ mappings and delete the domain */ |
| 1704 | if (gpiochip->irqdomain) { |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1705 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
| 1706 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) |
| 1707 | continue; |
Grygorii Strashko | e389338 | 2014-09-25 19:09:23 +0300 | [diff] [blame] | 1708 | irq_dispose_mapping( |
| 1709 | irq_find_mapping(gpiochip->irqdomain, offset)); |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1710 | } |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1711 | irq_domain_remove(gpiochip->irqdomain); |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1712 | } |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1713 | |
| 1714 | if (gpiochip->irqchip) { |
| 1715 | gpiochip->irqchip->irq_request_resources = NULL; |
| 1716 | gpiochip->irqchip->irq_release_resources = NULL; |
| 1717 | gpiochip->irqchip = NULL; |
| 1718 | } |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1719 | |
| 1720 | gpiochip_irqchip_free_valid_mask(gpiochip); |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1721 | } |
| 1722 | |
| 1723 | /** |
Linus Walleij | 739e6f5 | 2017-01-11 13:37:07 +0100 | [diff] [blame] | 1724 | * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1725 | * @gpiochip: the gpiochip to add the irqchip to |
| 1726 | * @irqchip: the irqchip to add to the gpiochip |
| 1727 | * @first_irq: if not dynamically assigned, the base (first) IRQ to |
| 1728 | * allocate gpiochip irqs from |
| 1729 | * @handler: the irq handler to use (often a predefined irq core function) |
Linus Walleij | 1333b90 | 2014-04-23 16:45:12 +0200 | [diff] [blame] | 1730 | * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE |
| 1731 | * to have the core avoid setting up any default type in the hardware. |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1732 | * @nested: whether this is a nested irqchip calling handle_nested_irq() |
| 1733 | * in its IRQ handler |
Grygorii Strashko | a0a8bcf | 2015-08-17 15:35:23 +0300 | [diff] [blame] | 1734 | * @lock_key: lockdep class |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1735 | * |
| 1736 | * This function closely associates a certain irqchip with a certain |
| 1737 | * gpiochip, providing an irq domain to translate the local IRQs to |
| 1738 | * global irqs in the gpiolib core, and making sure that the gpiochip |
| 1739 | * is passed as chip data to all related functions. Driver callbacks |
Linus Walleij | 09dd5f9 | 2015-12-07 15:31:58 +0100 | [diff] [blame] | 1740 | * need to use gpiochip_get_data() to get their local state containers back |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1741 | * from the gpiochip passed as chip data. An irqdomain will be stored |
| 1742 | * in the gpiochip that shall be used by the driver to handle IRQ number |
| 1743 | * translation. The gpiochip will need to be initialized and registered |
| 1744 | * before calling this function. |
| 1745 | * |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1746 | * This function will handle two cell:ed simple IRQs and assumes all |
| 1747 | * the pins on the gpiochip can generate a unique IRQ. Everything else |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1748 | * need to be open coded. |
| 1749 | */ |
Linus Walleij | 739e6f5 | 2017-01-11 13:37:07 +0100 | [diff] [blame] | 1750 | int gpiochip_irqchip_add_key(struct gpio_chip *gpiochip, |
| 1751 | struct irq_chip *irqchip, |
| 1752 | unsigned int first_irq, |
| 1753 | irq_flow_handler_t handler, |
| 1754 | unsigned int type, |
| 1755 | bool nested, |
| 1756 | struct lock_class_key *lock_key) |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1757 | { |
| 1758 | struct device_node *of_node; |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1759 | bool irq_base_set = false; |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1760 | unsigned int offset; |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1761 | unsigned irq_base = 0; |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1762 | |
| 1763 | if (!gpiochip || !irqchip) |
| 1764 | return -EINVAL; |
| 1765 | |
Linus Walleij | 58383c78 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 1766 | if (!gpiochip->parent) { |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1767 | pr_err("missing gpiochip .dev parent pointer\n"); |
| 1768 | return -EINVAL; |
| 1769 | } |
Linus Walleij | d245b3f | 2016-11-24 10:57:25 +0100 | [diff] [blame] | 1770 | gpiochip->irq_nested = nested; |
Linus Walleij | 58383c78 | 2015-11-04 09:56:26 +0100 | [diff] [blame] | 1771 | of_node = gpiochip->parent->of_node; |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1772 | #ifdef CONFIG_OF_GPIO |
| 1773 | /* |
Colin Cronin | 20a8a96 | 2015-05-18 11:41:43 -0700 | [diff] [blame] | 1774 | * If the gpiochip has an assigned OF node this takes precedence |
Bamvor Jian Zhang | c88402c | 2015-11-18 17:07:07 +0800 | [diff] [blame] | 1775 | * FIXME: get rid of this and use gpiochip->parent->of_node |
| 1776 | * everywhere |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1777 | */ |
| 1778 | if (gpiochip->of_node) |
| 1779 | of_node = gpiochip->of_node; |
| 1780 | #endif |
Marc Zyngier | 332e99d | 2016-09-07 09:12:11 +0100 | [diff] [blame] | 1781 | /* |
Mika Westerberg | 0a1e005 | 2016-09-12 14:29:51 +0300 | [diff] [blame] | 1782 | * Specifying a default trigger is a terrible idea if DT or ACPI is |
Marc Zyngier | 332e99d | 2016-09-07 09:12:11 +0100 | [diff] [blame] | 1783 | * used to configure the interrupts, as you may end-up with |
| 1784 | * conflicting triggers. Tell the user, and reset to NONE. |
| 1785 | */ |
| 1786 | if (WARN(of_node && type != IRQ_TYPE_NONE, |
| 1787 | "%s: Ignoring %d default trigger\n", of_node->full_name, type)) |
| 1788 | type = IRQ_TYPE_NONE; |
Mika Westerberg | 0a1e005 | 2016-09-12 14:29:51 +0300 | [diff] [blame] | 1789 | if (has_acpi_companion(gpiochip->parent) && type != IRQ_TYPE_NONE) { |
| 1790 | acpi_handle_warn(ACPI_HANDLE(gpiochip->parent), |
| 1791 | "Ignoring %d default trigger\n", type); |
| 1792 | type = IRQ_TYPE_NONE; |
| 1793 | } |
Marc Zyngier | 332e99d | 2016-09-07 09:12:11 +0100 | [diff] [blame] | 1794 | |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1795 | gpiochip->irqchip = irqchip; |
| 1796 | gpiochip->irq_handler = handler; |
| 1797 | gpiochip->irq_default_type = type; |
| 1798 | gpiochip->to_irq = gpiochip_to_irq; |
Grygorii Strashko | a0a8bcf | 2015-08-17 15:35:23 +0300 | [diff] [blame] | 1799 | gpiochip->lock_key = lock_key; |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1800 | gpiochip->irqdomain = irq_domain_add_simple(of_node, |
| 1801 | gpiochip->ngpio, first_irq, |
| 1802 | &gpiochip_domain_ops, gpiochip); |
| 1803 | if (!gpiochip->irqdomain) { |
| 1804 | gpiochip->irqchip = NULL; |
| 1805 | return -EINVAL; |
| 1806 | } |
Rabin Vincent | 8b67a1f | 2015-07-31 14:48:56 +0200 | [diff] [blame] | 1807 | |
| 1808 | /* |
| 1809 | * It is possible for a driver to override this, but only if the |
| 1810 | * alternative functions are both implemented. |
| 1811 | */ |
| 1812 | if (!irqchip->irq_request_resources && |
| 1813 | !irqchip->irq_release_resources) { |
| 1814 | irqchip->irq_request_resources = gpiochip_irq_reqres; |
| 1815 | irqchip->irq_release_resources = gpiochip_irq_relres; |
| 1816 | } |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1817 | |
| 1818 | /* |
| 1819 | * Prepare the mapping since the irqchip shall be orthogonal to |
| 1820 | * any gpiochip calls. If the first_irq was zero, this is |
| 1821 | * necessary to allocate descriptors for all IRQs. |
| 1822 | */ |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1823 | for (offset = 0; offset < gpiochip->ngpio; offset++) { |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1824 | if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) |
| 1825 | continue; |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1826 | irq_base = irq_create_mapping(gpiochip->irqdomain, offset); |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1827 | if (!irq_base_set) { |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1828 | /* |
| 1829 | * Store the base into the gpiochip to be used when |
| 1830 | * unmapping the irqs. |
| 1831 | */ |
| 1832 | gpiochip->irq_base = irq_base; |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1833 | irq_base_set = true; |
| 1834 | } |
Linus Walleij | c3626fd | 2014-03-28 20:42:01 +0100 | [diff] [blame] | 1835 | } |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1836 | |
Mika Westerberg | afa82fa | 2014-07-25 09:54:48 +0300 | [diff] [blame] | 1837 | acpi_gpiochip_request_interrupts(gpiochip); |
| 1838 | |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1839 | return 0; |
| 1840 | } |
Linus Walleij | 739e6f5 | 2017-01-11 13:37:07 +0100 | [diff] [blame] | 1841 | EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key); |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1842 | |
| 1843 | #else /* CONFIG_GPIOLIB_IRQCHIP */ |
| 1844 | |
| 1845 | static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {} |
Mika Westerberg | 79b804c | 2016-09-20 15:15:21 +0300 | [diff] [blame] | 1846 | static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip) |
| 1847 | { |
| 1848 | return 0; |
| 1849 | } |
| 1850 | static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip) |
| 1851 | { } |
Linus Walleij | 1425052 | 2014-03-25 10:40:18 +0100 | [diff] [blame] | 1852 | |
| 1853 | #endif /* CONFIG_GPIOLIB_IRQCHIP */ |
| 1854 | |
Jonas Gorski | c771c2f | 2015-10-11 17:34:15 +0200 | [diff] [blame] | 1855 | /** |
| 1856 | * gpiochip_generic_request() - request the gpio function for a pin |
| 1857 | * @chip: the gpiochip owning the GPIO |
| 1858 | * @offset: the offset of the GPIO to request for GPIO function |
| 1859 | */ |
| 1860 | int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset) |
| 1861 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1862 | return pinctrl_request_gpio(chip->gpiodev->base + offset); |
Jonas Gorski | c771c2f | 2015-10-11 17:34:15 +0200 | [diff] [blame] | 1863 | } |
| 1864 | EXPORT_SYMBOL_GPL(gpiochip_generic_request); |
| 1865 | |
| 1866 | /** |
| 1867 | * gpiochip_generic_free() - free the gpio function from a pin |
| 1868 | * @chip: the gpiochip to request the gpio function for |
| 1869 | * @offset: the offset of the GPIO to free from GPIO function |
| 1870 | */ |
| 1871 | void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset) |
| 1872 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1873 | pinctrl_free_gpio(chip->gpiodev->base + offset); |
Jonas Gorski | c771c2f | 2015-10-11 17:34:15 +0200 | [diff] [blame] | 1874 | } |
| 1875 | EXPORT_SYMBOL_GPL(gpiochip_generic_free); |
| 1876 | |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 1877 | /** |
| 1878 | * gpiochip_generic_config() - apply configuration for a pin |
| 1879 | * @chip: the gpiochip owning the GPIO |
| 1880 | * @offset: the offset of the GPIO to apply the configuration |
| 1881 | * @config: the configuration to be applied |
| 1882 | */ |
| 1883 | int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset, |
| 1884 | unsigned long config) |
| 1885 | { |
| 1886 | return pinctrl_gpio_set_config(chip->gpiodev->base + offset, config); |
| 1887 | } |
| 1888 | EXPORT_SYMBOL_GPL(gpiochip_generic_config); |
| 1889 | |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1890 | #ifdef CONFIG_PINCTRL |
Linus Walleij | 165adc9 | 2012-11-06 14:49:39 +0100 | [diff] [blame] | 1891 | |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 1892 | /** |
Christian Ruppert | 586a87e | 2013-10-15 15:37:54 +0200 | [diff] [blame] | 1893 | * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping |
| 1894 | * @chip: the gpiochip to add the range for |
Tomeu Vizoso | d32651f | 2015-06-17 15:42:11 +0200 | [diff] [blame] | 1895 | * @pctldev: the pin controller to map to |
Christian Ruppert | 586a87e | 2013-10-15 15:37:54 +0200 | [diff] [blame] | 1896 | * @gpio_offset: the start offset in the current gpio_chip number space |
| 1897 | * @pin_group: name of the pin group inside the pin controller |
| 1898 | */ |
| 1899 | int gpiochip_add_pingroup_range(struct gpio_chip *chip, |
| 1900 | struct pinctrl_dev *pctldev, |
| 1901 | unsigned int gpio_offset, const char *pin_group) |
| 1902 | { |
| 1903 | struct gpio_pin_range *pin_range; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1904 | struct gpio_device *gdev = chip->gpiodev; |
Christian Ruppert | 586a87e | 2013-10-15 15:37:54 +0200 | [diff] [blame] | 1905 | int ret; |
| 1906 | |
| 1907 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
| 1908 | if (!pin_range) { |
Andy Shevchenko | 1a2a99c | 2013-12-05 11:26:24 +0200 | [diff] [blame] | 1909 | chip_err(chip, "failed to allocate pin ranges\n"); |
Christian Ruppert | 586a87e | 2013-10-15 15:37:54 +0200 | [diff] [blame] | 1910 | return -ENOMEM; |
| 1911 | } |
| 1912 | |
| 1913 | /* Use local offset as range ID */ |
| 1914 | pin_range->range.id = gpio_offset; |
| 1915 | pin_range->range.gc = chip; |
| 1916 | pin_range->range.name = chip->label; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1917 | pin_range->range.base = gdev->base + gpio_offset; |
Christian Ruppert | 586a87e | 2013-10-15 15:37:54 +0200 | [diff] [blame] | 1918 | pin_range->pctldev = pctldev; |
| 1919 | |
| 1920 | ret = pinctrl_get_group_pins(pctldev, pin_group, |
| 1921 | &pin_range->range.pins, |
| 1922 | &pin_range->range.npins); |
Michal Nazarewicz | 61c6375 | 2013-11-13 21:20:39 +0100 | [diff] [blame] | 1923 | if (ret < 0) { |
| 1924 | kfree(pin_range); |
Christian Ruppert | 586a87e | 2013-10-15 15:37:54 +0200 | [diff] [blame] | 1925 | return ret; |
Michal Nazarewicz | 61c6375 | 2013-11-13 21:20:39 +0100 | [diff] [blame] | 1926 | } |
Christian Ruppert | 586a87e | 2013-10-15 15:37:54 +0200 | [diff] [blame] | 1927 | |
| 1928 | pinctrl_add_gpio_range(pctldev, &pin_range->range); |
| 1929 | |
Andy Shevchenko | 1a2a99c | 2013-12-05 11:26:24 +0200 | [diff] [blame] | 1930 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
| 1931 | gpio_offset, gpio_offset + pin_range->range.npins - 1, |
Christian Ruppert | 586a87e | 2013-10-15 15:37:54 +0200 | [diff] [blame] | 1932 | pinctrl_dev_get_devname(pctldev), pin_group); |
| 1933 | |
Linus Walleij | 20ec3e3 | 2016-02-11 11:03:06 +0100 | [diff] [blame] | 1934 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
Christian Ruppert | 586a87e | 2013-10-15 15:37:54 +0200 | [diff] [blame] | 1935 | |
| 1936 | return 0; |
| 1937 | } |
| 1938 | EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); |
| 1939 | |
| 1940 | /** |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 1941 | * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping |
| 1942 | * @chip: the gpiochip to add the range for |
| 1943 | * @pinctrl_name: the dev_name() of the pin controller to map to |
Linus Walleij | 316511c | 2012-11-21 08:48:09 +0100 | [diff] [blame] | 1944 | * @gpio_offset: the start offset in the current gpio_chip number space |
| 1945 | * @pin_offset: the start offset in the pin controller number space |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 1946 | * @npins: the number of pins from the offset of each pin space (GPIO and |
| 1947 | * pin controller) to accumulate in this range |
| 1948 | */ |
Linus Walleij | 1e63d7b | 2012-11-06 16:03:35 +0100 | [diff] [blame] | 1949 | int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, |
Linus Walleij | 316511c | 2012-11-21 08:48:09 +0100 | [diff] [blame] | 1950 | unsigned int gpio_offset, unsigned int pin_offset, |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 1951 | unsigned int npins) |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1952 | { |
| 1953 | struct gpio_pin_range *pin_range; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1954 | struct gpio_device *gdev = chip->gpiodev; |
Axel Lin | b4d4b1f | 2012-11-21 14:33:56 +0800 | [diff] [blame] | 1955 | int ret; |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1956 | |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 1957 | pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1958 | if (!pin_range) { |
Andy Shevchenko | 1a2a99c | 2013-12-05 11:26:24 +0200 | [diff] [blame] | 1959 | chip_err(chip, "failed to allocate pin ranges\n"); |
Linus Walleij | 1e63d7b | 2012-11-06 16:03:35 +0100 | [diff] [blame] | 1960 | return -ENOMEM; |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1961 | } |
| 1962 | |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 1963 | /* Use local offset as range ID */ |
Linus Walleij | 316511c | 2012-11-21 08:48:09 +0100 | [diff] [blame] | 1964 | pin_range->range.id = gpio_offset; |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 1965 | pin_range->range.gc = chip; |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1966 | pin_range->range.name = chip->label; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 1967 | pin_range->range.base = gdev->base + gpio_offset; |
Linus Walleij | 316511c | 2012-11-21 08:48:09 +0100 | [diff] [blame] | 1968 | pin_range->range.pin_base = pin_offset; |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1969 | pin_range->range.npins = npins; |
Linus Walleij | 192c369 | 2012-11-20 14:03:37 +0100 | [diff] [blame] | 1970 | pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1971 | &pin_range->range); |
Linus Walleij | 8f23ca1 | 2012-11-20 14:56:25 +0100 | [diff] [blame] | 1972 | if (IS_ERR(pin_range->pctldev)) { |
Axel Lin | b4d4b1f | 2012-11-21 14:33:56 +0800 | [diff] [blame] | 1973 | ret = PTR_ERR(pin_range->pctldev); |
Andy Shevchenko | 1a2a99c | 2013-12-05 11:26:24 +0200 | [diff] [blame] | 1974 | chip_err(chip, "could not create pin range\n"); |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 1975 | kfree(pin_range); |
Axel Lin | b4d4b1f | 2012-11-21 14:33:56 +0800 | [diff] [blame] | 1976 | return ret; |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 1977 | } |
Andy Shevchenko | 1a2a99c | 2013-12-05 11:26:24 +0200 | [diff] [blame] | 1978 | chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
| 1979 | gpio_offset, gpio_offset + npins - 1, |
Linus Walleij | 316511c | 2012-11-21 08:48:09 +0100 | [diff] [blame] | 1980 | pinctl_name, |
| 1981 | pin_offset, pin_offset + npins - 1); |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1982 | |
Linus Walleij | 20ec3e3 | 2016-02-11 11:03:06 +0100 | [diff] [blame] | 1983 | list_add_tail(&pin_range->node, &gdev->pin_ranges); |
Linus Walleij | 1e63d7b | 2012-11-06 16:03:35 +0100 | [diff] [blame] | 1984 | |
| 1985 | return 0; |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1986 | } |
Linus Walleij | 165adc9 | 2012-11-06 14:49:39 +0100 | [diff] [blame] | 1987 | EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1988 | |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 1989 | /** |
| 1990 | * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings |
| 1991 | * @chip: the chip to remove all the mappings for |
| 1992 | */ |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1993 | void gpiochip_remove_pin_ranges(struct gpio_chip *chip) |
| 1994 | { |
| 1995 | struct gpio_pin_range *pin_range, *tmp; |
Linus Walleij | 20ec3e3 | 2016-02-11 11:03:06 +0100 | [diff] [blame] | 1996 | struct gpio_device *gdev = chip->gpiodev; |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1997 | |
Linus Walleij | 20ec3e3 | 2016-02-11 11:03:06 +0100 | [diff] [blame] | 1998 | list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 1999 | list_del(&pin_range->node); |
| 2000 | pinctrl_remove_gpio_range(pin_range->pctldev, |
| 2001 | &pin_range->range); |
Linus Walleij | 3f0f867 | 2012-11-20 12:40:15 +0100 | [diff] [blame] | 2002 | kfree(pin_range); |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 2003 | } |
| 2004 | } |
Linus Walleij | 165adc9 | 2012-11-06 14:49:39 +0100 | [diff] [blame] | 2005 | EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
| 2006 | |
| 2007 | #endif /* CONFIG_PINCTRL */ |
Shiraz Hashim | f23f151 | 2012-10-27 15:21:36 +0530 | [diff] [blame] | 2008 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2009 | /* These "optional" allocation calls help prevent drivers from stomping |
| 2010 | * on each other, and help provide better diagnostics in debugfs. |
| 2011 | * They're called even less than the "set direction" calls. |
| 2012 | */ |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2013 | static int __gpiod_request(struct gpio_desc *desc, const char *label) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2014 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2015 | struct gpio_chip *chip = desc->gdev->chip; |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2016 | int status; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2017 | unsigned long flags; |
| 2018 | |
| 2019 | spin_lock_irqsave(&gpio_lock, flags); |
| 2020 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2021 | /* NOTE: gpio_request() can be called in early boot, |
David Brownell | 35e8bb5 | 2008-10-15 22:03:16 -0700 | [diff] [blame] | 2022 | * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2023 | */ |
| 2024 | |
| 2025 | if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { |
| 2026 | desc_set_label(desc, label ? : "?"); |
| 2027 | status = 0; |
Guennadi Liakhovetski | 438d890 | 2008-04-28 02:14:44 -0700 | [diff] [blame] | 2028 | } else { |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2029 | status = -EBUSY; |
Magnus Damm | 7460db5 | 2009-01-29 14:25:12 -0800 | [diff] [blame] | 2030 | goto done; |
David Brownell | 35e8bb5 | 2008-10-15 22:03:16 -0700 | [diff] [blame] | 2031 | } |
| 2032 | |
| 2033 | if (chip->request) { |
| 2034 | /* chip->request may sleep */ |
| 2035 | spin_unlock_irqrestore(&gpio_lock, flags); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2036 | status = chip->request(chip, gpio_chip_hwgpio(desc)); |
David Brownell | 35e8bb5 | 2008-10-15 22:03:16 -0700 | [diff] [blame] | 2037 | spin_lock_irqsave(&gpio_lock, flags); |
| 2038 | |
| 2039 | if (status < 0) { |
| 2040 | desc_set_label(desc, NULL); |
David Brownell | 35e8bb5 | 2008-10-15 22:03:16 -0700 | [diff] [blame] | 2041 | clear_bit(FLAG_REQUESTED, &desc->flags); |
Mathias Nyman | 80b0a60 | 2012-10-24 17:25:27 +0300 | [diff] [blame] | 2042 | goto done; |
David Brownell | 35e8bb5 | 2008-10-15 22:03:16 -0700 | [diff] [blame] | 2043 | } |
Guennadi Liakhovetski | 438d890 | 2008-04-28 02:14:44 -0700 | [diff] [blame] | 2044 | } |
Mathias Nyman | 80b0a60 | 2012-10-24 17:25:27 +0300 | [diff] [blame] | 2045 | if (chip->get_direction) { |
| 2046 | /* chip->get_direction may sleep */ |
| 2047 | spin_unlock_irqrestore(&gpio_lock, flags); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2048 | gpiod_get_direction(desc); |
Mathias Nyman | 80b0a60 | 2012-10-24 17:25:27 +0300 | [diff] [blame] | 2049 | spin_lock_irqsave(&gpio_lock, flags); |
| 2050 | } |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2051 | done: |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2052 | spin_unlock_irqrestore(&gpio_lock, flags); |
| 2053 | return status; |
| 2054 | } |
| 2055 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2056 | /* |
| 2057 | * This descriptor validation needs to be inserted verbatim into each |
| 2058 | * function taking a descriptor, so we need to use a preprocessor |
Linus Walleij | 54d7719 | 2016-05-30 16:48:39 +0200 | [diff] [blame] | 2059 | * macro to avoid endless duplication. If the desc is NULL it is an |
| 2060 | * optional GPIO and calls should just bail out. |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2061 | */ |
| 2062 | #define VALIDATE_DESC(desc) do { \ |
Linus Walleij | 54d7719 | 2016-05-30 16:48:39 +0200 | [diff] [blame] | 2063 | if (!desc) \ |
| 2064 | return 0; \ |
Linus Walleij | bfbbe44 | 2016-06-16 11:55:55 +0200 | [diff] [blame] | 2065 | if (IS_ERR(desc)) { \ |
| 2066 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ |
| 2067 | return PTR_ERR(desc); \ |
| 2068 | } \ |
Linus Walleij | 54d7719 | 2016-05-30 16:48:39 +0200 | [diff] [blame] | 2069 | if (!desc->gdev) { \ |
Linus Walleij | bfbbe44 | 2016-06-16 11:55:55 +0200 | [diff] [blame] | 2070 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2071 | return -EINVAL; \ |
| 2072 | } \ |
| 2073 | if ( !desc->gdev->chip ) { \ |
| 2074 | dev_warn(&desc->gdev->dev, \ |
| 2075 | "%s: backing chip is gone\n", __func__); \ |
| 2076 | return 0; \ |
| 2077 | } } while (0) |
| 2078 | |
| 2079 | #define VALIDATE_DESC_VOID(desc) do { \ |
Linus Walleij | 54d7719 | 2016-05-30 16:48:39 +0200 | [diff] [blame] | 2080 | if (!desc) \ |
| 2081 | return; \ |
Linus Walleij | bfbbe44 | 2016-06-16 11:55:55 +0200 | [diff] [blame] | 2082 | if (IS_ERR(desc)) { \ |
| 2083 | pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \ |
| 2084 | return; \ |
| 2085 | } \ |
Linus Walleij | 54d7719 | 2016-05-30 16:48:39 +0200 | [diff] [blame] | 2086 | if (!desc->gdev) { \ |
Linus Walleij | bfbbe44 | 2016-06-16 11:55:55 +0200 | [diff] [blame] | 2087 | pr_warn("%s: invalid GPIO (no device)\n", __func__); \ |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2088 | return; \ |
| 2089 | } \ |
| 2090 | if (!desc->gdev->chip) { \ |
| 2091 | dev_warn(&desc->gdev->dev, \ |
| 2092 | "%s: backing chip is gone\n", __func__); \ |
| 2093 | return; \ |
| 2094 | } } while (0) |
| 2095 | |
| 2096 | |
Alexandre Courbot | 0eb4c6c | 2014-07-01 14:45:15 +0900 | [diff] [blame] | 2097 | int gpiod_request(struct gpio_desc *desc, const char *label) |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2098 | { |
| 2099 | int status = -EPROBE_DEFER; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2100 | struct gpio_device *gdev; |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2101 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2102 | VALIDATE_DESC(desc); |
| 2103 | gdev = desc->gdev; |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2104 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2105 | if (try_module_get(gdev->owner)) { |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2106 | status = __gpiod_request(desc, label); |
| 2107 | if (status < 0) |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2108 | module_put(gdev->owner); |
Linus Walleij | 33a68e8 | 2016-02-11 10:28:44 +0100 | [diff] [blame] | 2109 | else |
| 2110 | get_device(&gdev->dev); |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2111 | } |
| 2112 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2113 | if (status) |
Andy Shevchenko | 7589e59 | 2013-12-05 11:26:23 +0200 | [diff] [blame] | 2114 | gpiod_dbg(desc, "%s: status %d\n", __func__, status); |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2115 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2116 | return status; |
| 2117 | } |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2118 | |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2119 | static bool __gpiod_free(struct gpio_desc *desc) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2120 | { |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2121 | bool ret = false; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2122 | unsigned long flags; |
David Brownell | 35e8bb5 | 2008-10-15 22:03:16 -0700 | [diff] [blame] | 2123 | struct gpio_chip *chip; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2124 | |
Uwe Kleine-König | 3d599d1 | 2008-10-15 22:03:12 -0700 | [diff] [blame] | 2125 | might_sleep(); |
| 2126 | |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2127 | gpiod_unexport(desc); |
David Brownell | d8f388d8 | 2008-07-25 01:46:07 -0700 | [diff] [blame] | 2128 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2129 | spin_lock_irqsave(&gpio_lock, flags); |
| 2130 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2131 | chip = desc->gdev->chip; |
David Brownell | 35e8bb5 | 2008-10-15 22:03:16 -0700 | [diff] [blame] | 2132 | if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) { |
| 2133 | if (chip->free) { |
| 2134 | spin_unlock_irqrestore(&gpio_lock, flags); |
David Brownell | 9c4ba94 | 2010-08-10 18:02:24 -0700 | [diff] [blame] | 2135 | might_sleep_if(chip->can_sleep); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2136 | chip->free(chip, gpio_chip_hwgpio(desc)); |
David Brownell | 35e8bb5 | 2008-10-15 22:03:16 -0700 | [diff] [blame] | 2137 | spin_lock_irqsave(&gpio_lock, flags); |
| 2138 | } |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2139 | desc_set_label(desc, NULL); |
Jani Nikula | 0769746 | 2009-12-15 16:46:20 -0800 | [diff] [blame] | 2140 | clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
David Brownell | 35e8bb5 | 2008-10-15 22:03:16 -0700 | [diff] [blame] | 2141 | clear_bit(FLAG_REQUESTED, &desc->flags); |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2142 | clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2143 | clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 2144 | clear_bit(FLAG_IS_HOGGED, &desc->flags); |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2145 | ret = true; |
| 2146 | } |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2147 | |
| 2148 | spin_unlock_irqrestore(&gpio_lock, flags); |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2149 | return ret; |
| 2150 | } |
| 2151 | |
Alexandre Courbot | 0eb4c6c | 2014-07-01 14:45:15 +0900 | [diff] [blame] | 2152 | void gpiod_free(struct gpio_desc *desc) |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2153 | { |
Linus Walleij | 33a68e8 | 2016-02-11 10:28:44 +0100 | [diff] [blame] | 2154 | if (desc && desc->gdev && __gpiod_free(desc)) { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2155 | module_put(desc->gdev->owner); |
Linus Walleij | 33a68e8 | 2016-02-11 10:28:44 +0100 | [diff] [blame] | 2156 | put_device(&desc->gdev->dev); |
| 2157 | } else { |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2158 | WARN_ON(extra_checks); |
Linus Walleij | 33a68e8 | 2016-02-11 10:28:44 +0100 | [diff] [blame] | 2159 | } |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2160 | } |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2161 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2162 | /** |
| 2163 | * gpiochip_is_requested - return string iff signal was requested |
| 2164 | * @chip: controller managing the signal |
| 2165 | * @offset: of signal within controller's 0..(ngpio - 1) range |
| 2166 | * |
| 2167 | * Returns NULL if the GPIO is not currently requested, else a string. |
Alexandre Courbot | 9c8318f | 2014-07-01 14:45:14 +0900 | [diff] [blame] | 2168 | * The string returned is the label passed to gpio_request(); if none has been |
| 2169 | * passed it is a meaningless, non-NULL constant. |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2170 | * |
| 2171 | * This function is for use by GPIO controller drivers. The label can |
| 2172 | * help with diagnostics, and knowing that the signal is used as a GPIO |
| 2173 | * can help avoid accidentally multiplexing it to another controller. |
| 2174 | */ |
| 2175 | const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset) |
| 2176 | { |
Alexandre Courbot | 6c0b4e6 | 2013-02-03 01:29:30 +0900 | [diff] [blame] | 2177 | struct gpio_desc *desc; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2178 | |
Dirk Behme | 48b5953 | 2015-08-18 18:02:32 +0200 | [diff] [blame] | 2179 | if (offset >= chip->ngpio) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2180 | return NULL; |
Alexandre Courbot | 6c0b4e6 | 2013-02-03 01:29:30 +0900 | [diff] [blame] | 2181 | |
Linus Walleij | 1c3cdb1 | 2016-02-09 13:51:59 +0100 | [diff] [blame] | 2182 | desc = &chip->gpiodev->descs[offset]; |
Alexandre Courbot | 6c0b4e6 | 2013-02-03 01:29:30 +0900 | [diff] [blame] | 2183 | |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2184 | if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2185 | return NULL; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2186 | return desc->label; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2187 | } |
| 2188 | EXPORT_SYMBOL_GPL(gpiochip_is_requested); |
| 2189 | |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2190 | /** |
| 2191 | * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor |
| 2192 | * @desc: GPIO descriptor to request |
| 2193 | * @label: label for the GPIO |
| 2194 | * |
| 2195 | * Function allows GPIO chip drivers to request and use their own GPIO |
| 2196 | * descriptors via gpiolib API. Difference to gpiod_request() is that this |
| 2197 | * function will not increase reference count of the GPIO chip module. This |
| 2198 | * allows the GPIO chip module to be unloaded as needed (we assume that the |
| 2199 | * GPIO chip driver handles freeing the GPIOs it has requested). |
| 2200 | */ |
Alexandre Courbot | abdc08a | 2014-08-19 10:06:09 -0700 | [diff] [blame] | 2201 | struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum, |
| 2202 | const char *label) |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2203 | { |
Alexandre Courbot | abdc08a | 2014-08-19 10:06:09 -0700 | [diff] [blame] | 2204 | struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum); |
| 2205 | int err; |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2206 | |
Alexandre Courbot | abdc08a | 2014-08-19 10:06:09 -0700 | [diff] [blame] | 2207 | if (IS_ERR(desc)) { |
| 2208 | chip_err(chip, "failed to get GPIO descriptor\n"); |
| 2209 | return desc; |
| 2210 | } |
| 2211 | |
| 2212 | err = __gpiod_request(desc, label); |
| 2213 | if (err < 0) |
| 2214 | return ERR_PTR(err); |
| 2215 | |
| 2216 | return desc; |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2217 | } |
Guenter Roeck | f7d4ad9 | 2014-07-22 08:01:01 -0700 | [diff] [blame] | 2218 | EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
Mika Westerberg | 77c2d79 | 2014-03-10 14:54:50 +0200 | [diff] [blame] | 2219 | |
| 2220 | /** |
| 2221 | * gpiochip_free_own_desc - Free GPIO requested by the chip driver |
| 2222 | * @desc: GPIO descriptor to free |
| 2223 | * |
| 2224 | * Function frees the given GPIO requested previously with |
| 2225 | * gpiochip_request_own_desc(). |
| 2226 | */ |
| 2227 | void gpiochip_free_own_desc(struct gpio_desc *desc) |
| 2228 | { |
| 2229 | if (desc) |
| 2230 | __gpiod_free(desc); |
| 2231 | } |
Guenter Roeck | f7d4ad9 | 2014-07-22 08:01:01 -0700 | [diff] [blame] | 2232 | EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2233 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2234 | /* |
| 2235 | * Drivers MUST set GPIO direction before making get/set calls. In |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2236 | * some cases this is done in early boot, before IRQs are enabled. |
| 2237 | * |
| 2238 | * As a rule these aren't called more than once (except for drivers |
| 2239 | * using the open-drain emulation idiom) so these are natural places |
| 2240 | * to accumulate extra debugging checks. Note that we can't (yet) |
| 2241 | * rely on gpio_request() having been called beforehand. |
| 2242 | */ |
| 2243 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2244 | /** |
| 2245 | * gpiod_direction_input - set the GPIO direction to input |
| 2246 | * @desc: GPIO to set to input |
| 2247 | * |
| 2248 | * Set the direction of the passed GPIO to input, such as gpiod_get_value() can |
| 2249 | * be called safely on it. |
| 2250 | * |
| 2251 | * Return 0 in case of success, else an error code. |
| 2252 | */ |
| 2253 | int gpiod_direction_input(struct gpio_desc *desc) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2254 | { |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2255 | struct gpio_chip *chip; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2256 | int status = -EINVAL; |
| 2257 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2258 | VALIDATE_DESC(desc); |
| 2259 | chip = desc->gdev->chip; |
Alexandre Courbot | bcabdef | 2013-02-15 14:46:14 +0900 | [diff] [blame] | 2260 | |
Linus Walleij | be1a4b1 | 2013-08-30 09:41:45 +0200 | [diff] [blame] | 2261 | if (!chip->get || !chip->direction_input) { |
Mark Brown | 6424de5 | 2013-09-09 10:33:49 +0100 | [diff] [blame] | 2262 | gpiod_warn(desc, |
| 2263 | "%s: missing get() or direction_input() operations\n", |
Andy Shevchenko | 7589e59 | 2013-12-05 11:26:23 +0200 | [diff] [blame] | 2264 | __func__); |
Linus Walleij | be1a4b1 | 2013-08-30 09:41:45 +0200 | [diff] [blame] | 2265 | return -EIO; |
| 2266 | } |
| 2267 | |
Alexandre Courbot | d82da79 | 2014-07-22 16:17:43 +0900 | [diff] [blame] | 2268 | status = chip->direction_input(chip, gpio_chip_hwgpio(desc)); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2269 | if (status == 0) |
| 2270 | clear_bit(FLAG_IS_OUT, &desc->flags); |
Uwe Kleine-König | 3f397c21 | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 2271 | |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2272 | trace_gpio_direction(desc_to_gpio(desc), 1, status); |
Alexandre Courbot | d82da79 | 2014-07-22 16:17:43 +0900 | [diff] [blame] | 2273 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2274 | return status; |
| 2275 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2276 | EXPORT_SYMBOL_GPL(gpiod_direction_input); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2277 | |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 2278 | static int gpio_set_drive_single_ended(struct gpio_chip *gc, unsigned offset, |
| 2279 | enum pin_config_param mode) |
| 2280 | { |
| 2281 | unsigned long config = { PIN_CONF_PACKED(mode, 0) }; |
| 2282 | |
| 2283 | return gc->set_config ? gc->set_config(gc, offset, config) : -ENOTSUPP; |
| 2284 | } |
| 2285 | |
Philipp Zabel | ef70bbe | 2014-01-07 12:34:11 +0100 | [diff] [blame] | 2286 | static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2287 | { |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2288 | struct gpio_chip *gc = desc->gdev->chip; |
Linus Walleij | ad17731 | 2016-11-13 23:02:44 +0100 | [diff] [blame] | 2289 | int val = !!value; |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2290 | int ret; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2291 | |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2292 | /* GPIOs used for IRQs shall not be set as output */ |
| 2293 | if (test_bit(FLAG_USED_AS_IRQ, &desc->flags)) { |
| 2294 | gpiod_err(desc, |
| 2295 | "%s: tried to set a GPIO tied to an IRQ as output\n", |
| 2296 | __func__); |
| 2297 | return -EIO; |
| 2298 | } |
| 2299 | |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2300 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
| 2301 | /* First see if we can enable open drain in hardware */ |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 2302 | ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), |
| 2303 | PIN_CONFIG_DRIVE_OPEN_DRAIN); |
| 2304 | if (!ret) |
| 2305 | goto set_output_value; |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2306 | /* Emulate open drain by not actively driving the line high */ |
Linus Walleij | ad17731 | 2016-11-13 23:02:44 +0100 | [diff] [blame] | 2307 | if (val) |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2308 | return gpiod_direction_input(desc); |
| 2309 | } |
| 2310 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 2311 | ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), |
| 2312 | PIN_CONFIG_DRIVE_OPEN_SOURCE); |
| 2313 | if (!ret) |
| 2314 | goto set_output_value; |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2315 | /* Emulate open source by not actively driving the line low */ |
Linus Walleij | ad17731 | 2016-11-13 23:02:44 +0100 | [diff] [blame] | 2316 | if (!val) |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2317 | return gpiod_direction_input(desc); |
| 2318 | } else { |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 2319 | gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc), |
| 2320 | PIN_CONFIG_DRIVE_PUSH_PULL); |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2321 | } |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2322 | |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2323 | set_output_value: |
| 2324 | if (!gc->set || !gc->direction_output) { |
Mark Brown | 6424de5 | 2013-09-09 10:33:49 +0100 | [diff] [blame] | 2325 | gpiod_warn(desc, |
| 2326 | "%s: missing set() or direction_output() operations\n", |
| 2327 | __func__); |
Linus Walleij | be1a4b1 | 2013-08-30 09:41:45 +0200 | [diff] [blame] | 2328 | return -EIO; |
| 2329 | } |
| 2330 | |
Linus Walleij | ad17731 | 2016-11-13 23:02:44 +0100 | [diff] [blame] | 2331 | ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val); |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2332 | if (!ret) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2333 | set_bit(FLAG_IS_OUT, &desc->flags); |
Linus Walleij | ad17731 | 2016-11-13 23:02:44 +0100 | [diff] [blame] | 2334 | trace_gpio_value(desc_to_gpio(desc), 0, val); |
Linus Walleij | c663e5f | 2016-03-22 10:51:16 +0100 | [diff] [blame] | 2335 | trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
| 2336 | return ret; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2337 | } |
Philipp Zabel | ef70bbe | 2014-01-07 12:34:11 +0100 | [diff] [blame] | 2338 | |
| 2339 | /** |
| 2340 | * gpiod_direction_output_raw - set the GPIO direction to output |
| 2341 | * @desc: GPIO to set to output |
| 2342 | * @value: initial output value of the GPIO |
| 2343 | * |
| 2344 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can |
| 2345 | * be called safely on it. The initial value of the output must be specified |
| 2346 | * as raw value on the physical line without regard for the ACTIVE_LOW status. |
| 2347 | * |
| 2348 | * Return 0 in case of success, else an error code. |
| 2349 | */ |
| 2350 | int gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
| 2351 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2352 | VALIDATE_DESC(desc); |
Philipp Zabel | ef70bbe | 2014-01-07 12:34:11 +0100 | [diff] [blame] | 2353 | return _gpiod_direction_output_raw(desc, value); |
| 2354 | } |
| 2355 | EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); |
| 2356 | |
| 2357 | /** |
Rahul Bedarkar | 90df4fe | 2014-02-08 11:55:25 +0530 | [diff] [blame] | 2358 | * gpiod_direction_output - set the GPIO direction to output |
Philipp Zabel | ef70bbe | 2014-01-07 12:34:11 +0100 | [diff] [blame] | 2359 | * @desc: GPIO to set to output |
| 2360 | * @value: initial output value of the GPIO |
| 2361 | * |
| 2362 | * Set the direction of the passed GPIO to output, such as gpiod_set_value() can |
| 2363 | * be called safely on it. The initial value of the output must be specified |
| 2364 | * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into |
| 2365 | * account. |
| 2366 | * |
| 2367 | * Return 0 in case of success, else an error code. |
| 2368 | */ |
| 2369 | int gpiod_direction_output(struct gpio_desc *desc, int value) |
| 2370 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2371 | VALIDATE_DESC(desc); |
Philipp Zabel | ef70bbe | 2014-01-07 12:34:11 +0100 | [diff] [blame] | 2372 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| 2373 | value = !value; |
Linus Walleij | ad17731 | 2016-11-13 23:02:44 +0100 | [diff] [blame] | 2374 | else |
| 2375 | value = !!value; |
Philipp Zabel | ef70bbe | 2014-01-07 12:34:11 +0100 | [diff] [blame] | 2376 | return _gpiod_direction_output_raw(desc, value); |
| 2377 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2378 | EXPORT_SYMBOL_GPL(gpiod_direction_output); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2379 | |
Felipe Balbi | c4b5be9 | 2010-05-26 14:42:23 -0700 | [diff] [blame] | 2380 | /** |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2381 | * gpiod_set_debounce - sets @debounce time for a @gpio |
Felipe Balbi | c4b5be9 | 2010-05-26 14:42:23 -0700 | [diff] [blame] | 2382 | * @gpio: the gpio to set debounce time |
| 2383 | * @debounce: debounce time is microseconds |
Linus Walleij | 65d8765 | 2013-09-04 14:17:08 +0200 | [diff] [blame] | 2384 | * |
| 2385 | * returns -ENOTSUPP if the controller does not support setting |
| 2386 | * debounce. |
Felipe Balbi | c4b5be9 | 2010-05-26 14:42:23 -0700 | [diff] [blame] | 2387 | */ |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2388 | int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce) |
Felipe Balbi | c4b5be9 | 2010-05-26 14:42:23 -0700 | [diff] [blame] | 2389 | { |
Felipe Balbi | c4b5be9 | 2010-05-26 14:42:23 -0700 | [diff] [blame] | 2390 | struct gpio_chip *chip; |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 2391 | unsigned long config; |
Felipe Balbi | c4b5be9 | 2010-05-26 14:42:23 -0700 | [diff] [blame] | 2392 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2393 | VALIDATE_DESC(desc); |
| 2394 | chip = desc->gdev->chip; |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 2395 | if (!chip->set || !chip->set_config) { |
Mark Brown | 6424de5 | 2013-09-09 10:33:49 +0100 | [diff] [blame] | 2396 | gpiod_dbg(desc, |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 2397 | "%s: missing set() or set_config() operations\n", |
Mark Brown | 6424de5 | 2013-09-09 10:33:49 +0100 | [diff] [blame] | 2398 | __func__); |
Linus Walleij | 65d8765 | 2013-09-04 14:17:08 +0200 | [diff] [blame] | 2399 | return -ENOTSUPP; |
Linus Walleij | be1a4b1 | 2013-08-30 09:41:45 +0200 | [diff] [blame] | 2400 | } |
| 2401 | |
Mika Westerberg | 2956b5d | 2017-01-23 15:34:34 +0300 | [diff] [blame] | 2402 | config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce); |
| 2403 | return chip->set_config(chip, gpio_chip_hwgpio(desc), config); |
Felipe Balbi | c4b5be9 | 2010-05-26 14:42:23 -0700 | [diff] [blame] | 2404 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2405 | EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2406 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2407 | /** |
| 2408 | * gpiod_is_active_low - test whether a GPIO is active-low or not |
| 2409 | * @desc: the gpio descriptor to test |
| 2410 | * |
| 2411 | * Returns 1 if the GPIO is active-low, 0 otherwise. |
| 2412 | */ |
| 2413 | int gpiod_is_active_low(const struct gpio_desc *desc) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2414 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2415 | VALIDATE_DESC(desc); |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2416 | return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2417 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2418 | EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2419 | |
| 2420 | /* I/O calls are only valid after configuration completed; the relevant |
| 2421 | * "is this a valid GPIO" error checks should already have been done. |
| 2422 | * |
| 2423 | * "Get" operations are often inlinable as reading a pin value register, |
| 2424 | * and masking the relevant bit in that register. |
| 2425 | * |
| 2426 | * When "set" operations are inlinable, they involve writing that mask to |
| 2427 | * one register to set a low value, or a different register to set it high. |
| 2428 | * Otherwise locking is needed, so there may be little value to inlining. |
| 2429 | * |
| 2430 | *------------------------------------------------------------------------ |
| 2431 | * |
| 2432 | * IMPORTANT!!! The hot paths -- get/set value -- assume that callers |
| 2433 | * have requested the GPIO. That can include implicit requesting by |
| 2434 | * a direction setting call. Marking a gpio as requested locks its chip |
| 2435 | * in memory, guaranteeing that these table lookups need no more locking |
| 2436 | * and that gpiochip_remove() will fail. |
| 2437 | * |
| 2438 | * REVISIT when debugging, consider adding some instrumentation to ensure |
| 2439 | * that the GPIO was actually requested. |
| 2440 | */ |
| 2441 | |
Bjorn Andersson | e20538b | 2015-08-28 09:44:18 -0700 | [diff] [blame] | 2442 | static int _gpiod_get_raw_value(const struct gpio_desc *desc) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2443 | { |
| 2444 | struct gpio_chip *chip; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2445 | int offset; |
Bjorn Andersson | e20538b | 2015-08-28 09:44:18 -0700 | [diff] [blame] | 2446 | int value; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2447 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2448 | chip = desc->gdev->chip; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2449 | offset = gpio_chip_hwgpio(desc); |
Bjorn Andersson | e20538b | 2015-08-28 09:44:18 -0700 | [diff] [blame] | 2450 | value = chip->get ? chip->get(chip, offset) : -EIO; |
Linus Walleij | 723a630 | 2015-12-21 23:10:12 +0100 | [diff] [blame] | 2451 | value = value < 0 ? value : !!value; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2452 | trace_gpio_value(desc_to_gpio(desc), 1, value); |
Uwe Kleine-König | 3f397c21 | 2011-05-20 00:40:19 -0600 | [diff] [blame] | 2453 | return value; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2454 | } |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2455 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2456 | /** |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2457 | * gpiod_get_raw_value() - return a gpio's raw value |
| 2458 | * @desc: gpio whose value will be returned |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2459 | * |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2460 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
Bjorn Andersson | e20538b | 2015-08-28 09:44:18 -0700 | [diff] [blame] | 2461 | * its ACTIVE_LOW status, or negative errno on failure. |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2462 | * |
| 2463 | * This function should be called from contexts where we cannot sleep, and will |
| 2464 | * complain if the GPIO chip functions potentially sleep. |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2465 | */ |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2466 | int gpiod_get_raw_value(const struct gpio_desc *desc) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2467 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2468 | VALIDATE_DESC(desc); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2469 | /* Should be using gpio_get_value_cansleep() */ |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2470 | WARN_ON(desc->gdev->chip->can_sleep); |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2471 | return _gpiod_get_raw_value(desc); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2472 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2473 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2474 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2475 | /** |
| 2476 | * gpiod_get_value() - return a gpio's value |
| 2477 | * @desc: gpio whose value will be returned |
| 2478 | * |
| 2479 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into |
Bjorn Andersson | e20538b | 2015-08-28 09:44:18 -0700 | [diff] [blame] | 2480 | * account, or negative errno on failure. |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2481 | * |
| 2482 | * This function should be called from contexts where we cannot sleep, and will |
| 2483 | * complain if the GPIO chip functions potentially sleep. |
| 2484 | */ |
| 2485 | int gpiod_get_value(const struct gpio_desc *desc) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2486 | { |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2487 | int value; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2488 | |
| 2489 | VALIDATE_DESC(desc); |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2490 | /* Should be using gpio_get_value_cansleep() */ |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2491 | WARN_ON(desc->gdev->chip->can_sleep); |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2492 | |
| 2493 | value = _gpiod_get_raw_value(desc); |
Bjorn Andersson | e20538b | 2015-08-28 09:44:18 -0700 | [diff] [blame] | 2494 | if (value < 0) |
| 2495 | return value; |
| 2496 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2497 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| 2498 | value = !value; |
| 2499 | |
| 2500 | return value; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2501 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2502 | EXPORT_SYMBOL_GPL(gpiod_get_value); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2503 | |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2504 | /* |
| 2505 | * _gpio_set_open_drain_value() - Set the open drain gpio's value. |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2506 | * @desc: gpio descriptor whose state need to be set. |
Colin Cronin | 20a8a96 | 2015-05-18 11:41:43 -0700 | [diff] [blame] | 2507 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2508 | */ |
Alexandre Courbot | 2360096 | 2014-03-11 15:52:09 +0900 | [diff] [blame] | 2509 | static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value) |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2510 | { |
| 2511 | int err = 0; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2512 | struct gpio_chip *chip = desc->gdev->chip; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2513 | int offset = gpio_chip_hwgpio(desc); |
| 2514 | |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2515 | if (value) { |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2516 | err = chip->direction_input(chip, offset); |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2517 | if (!err) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2518 | clear_bit(FLAG_IS_OUT, &desc->flags); |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2519 | } else { |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2520 | err = chip->direction_output(chip, offset, 0); |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2521 | if (!err) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2522 | set_bit(FLAG_IS_OUT, &desc->flags); |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2523 | } |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2524 | trace_gpio_direction(desc_to_gpio(desc), value, err); |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2525 | if (err < 0) |
Mark Brown | 6424de5 | 2013-09-09 10:33:49 +0100 | [diff] [blame] | 2526 | gpiod_err(desc, |
| 2527 | "%s: Error in set_value for open drain err %d\n", |
| 2528 | __func__, err); |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2529 | } |
| 2530 | |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2531 | /* |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2532 | * _gpio_set_open_source_value() - Set the open source gpio's value. |
| 2533 | * @desc: gpio descriptor whose state need to be set. |
Colin Cronin | 20a8a96 | 2015-05-18 11:41:43 -0700 | [diff] [blame] | 2534 | * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2535 | */ |
Alexandre Courbot | 2360096 | 2014-03-11 15:52:09 +0900 | [diff] [blame] | 2536 | static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value) |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2537 | { |
| 2538 | int err = 0; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2539 | struct gpio_chip *chip = desc->gdev->chip; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2540 | int offset = gpio_chip_hwgpio(desc); |
| 2541 | |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2542 | if (value) { |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2543 | err = chip->direction_output(chip, offset, 1); |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2544 | if (!err) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2545 | set_bit(FLAG_IS_OUT, &desc->flags); |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2546 | } else { |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2547 | err = chip->direction_input(chip, offset); |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2548 | if (!err) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2549 | clear_bit(FLAG_IS_OUT, &desc->flags); |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2550 | } |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2551 | trace_gpio_direction(desc_to_gpio(desc), !value, err); |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2552 | if (err < 0) |
Mark Brown | 6424de5 | 2013-09-09 10:33:49 +0100 | [diff] [blame] | 2553 | gpiod_err(desc, |
| 2554 | "%s: Error in set_value for open source err %d\n", |
| 2555 | __func__, err); |
Laxman Dewangan | 25553ff | 2012-02-17 20:26:22 +0530 | [diff] [blame] | 2556 | } |
| 2557 | |
Alexandre Courbot | 2360096 | 2014-03-11 15:52:09 +0900 | [diff] [blame] | 2558 | static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2559 | { |
| 2560 | struct gpio_chip *chip; |
| 2561 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2562 | chip = desc->gdev->chip; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2563 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
| 2564 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
| 2565 | _gpio_set_open_drain_value(desc, value); |
| 2566 | else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
| 2567 | _gpio_set_open_source_value(desc, value); |
Laxman Dewangan | aca5ce1 | 2012-02-17 20:26:21 +0530 | [diff] [blame] | 2568 | else |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2569 | chip->set(chip, gpio_chip_hwgpio(desc), value); |
| 2570 | } |
| 2571 | |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2572 | /* |
| 2573 | * set multiple outputs on the same chip; |
| 2574 | * use the chip's set_multiple function if available; |
| 2575 | * otherwise set the outputs sequentially; |
| 2576 | * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word |
| 2577 | * defines which outputs are to be changed |
| 2578 | * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word |
| 2579 | * defines the values the outputs specified by mask are to be set to |
| 2580 | */ |
| 2581 | static void gpio_chip_set_multiple(struct gpio_chip *chip, |
| 2582 | unsigned long *mask, unsigned long *bits) |
| 2583 | { |
| 2584 | if (chip->set_multiple) { |
| 2585 | chip->set_multiple(chip, mask, bits); |
| 2586 | } else { |
Andy Shevchenko | 5e4e6fb | 2017-01-03 19:01:17 +0200 | [diff] [blame] | 2587 | unsigned int i; |
| 2588 | |
| 2589 | /* set outputs if the corresponding mask bit is set */ |
| 2590 | for_each_set_bit(i, mask, chip->ngpio) |
| 2591 | chip->set(chip, i, test_bit(i, bits)); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2592 | } |
| 2593 | } |
| 2594 | |
Linus Walleij | 44c7288 | 2016-04-24 11:36:59 +0200 | [diff] [blame] | 2595 | void gpiod_set_array_value_complex(bool raw, bool can_sleep, |
| 2596 | unsigned int array_size, |
| 2597 | struct gpio_desc **desc_array, |
| 2598 | int *value_array) |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2599 | { |
| 2600 | int i = 0; |
| 2601 | |
| 2602 | while (i < array_size) { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2603 | struct gpio_chip *chip = desc_array[i]->gdev->chip; |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2604 | unsigned long mask[BITS_TO_LONGS(chip->ngpio)]; |
| 2605 | unsigned long bits[BITS_TO_LONGS(chip->ngpio)]; |
| 2606 | int count = 0; |
| 2607 | |
Daniel Lockyer | 38e003f | 2015-06-10 14:26:27 +0100 | [diff] [blame] | 2608 | if (!can_sleep) |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2609 | WARN_ON(chip->can_sleep); |
Daniel Lockyer | 38e003f | 2015-06-10 14:26:27 +0100 | [diff] [blame] | 2610 | |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2611 | memset(mask, 0, sizeof(mask)); |
| 2612 | do { |
| 2613 | struct gpio_desc *desc = desc_array[i]; |
| 2614 | int hwgpio = gpio_chip_hwgpio(desc); |
| 2615 | int value = value_array[i]; |
| 2616 | |
| 2617 | if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| 2618 | value = !value; |
| 2619 | trace_gpio_value(desc_to_gpio(desc), 0, value); |
| 2620 | /* |
| 2621 | * collect all normal outputs belonging to the same chip |
| 2622 | * open drain and open source outputs are set individually |
| 2623 | */ |
| 2624 | if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
Daniel Lockyer | 38e003f | 2015-06-10 14:26:27 +0100 | [diff] [blame] | 2625 | _gpio_set_open_drain_value(desc, value); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2626 | } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
| 2627 | _gpio_set_open_source_value(desc, value); |
| 2628 | } else { |
| 2629 | __set_bit(hwgpio, mask); |
Daniel Lockyer | 38e003f | 2015-06-10 14:26:27 +0100 | [diff] [blame] | 2630 | if (value) |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2631 | __set_bit(hwgpio, bits); |
Daniel Lockyer | 38e003f | 2015-06-10 14:26:27 +0100 | [diff] [blame] | 2632 | else |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2633 | __clear_bit(hwgpio, bits); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2634 | count++; |
| 2635 | } |
| 2636 | i++; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2637 | } while ((i < array_size) && |
| 2638 | (desc_array[i]->gdev->chip == chip)); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2639 | /* push collected bits to outputs */ |
Daniel Lockyer | 38e003f | 2015-06-10 14:26:27 +0100 | [diff] [blame] | 2640 | if (count != 0) |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2641 | gpio_chip_set_multiple(chip, mask, bits); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2642 | } |
| 2643 | } |
| 2644 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2645 | /** |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2646 | * gpiod_set_raw_value() - assign a gpio's raw value |
| 2647 | * @desc: gpio whose value will be assigned |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2648 | * @value: value to assign |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2649 | * |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2650 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
| 2651 | * regard for its ACTIVE_LOW status. |
| 2652 | * |
| 2653 | * This function should be called from contexts where we cannot sleep, and will |
| 2654 | * complain if the GPIO chip functions potentially sleep. |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2655 | */ |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2656 | void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2657 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2658 | VALIDATE_DESC_VOID(desc); |
Geert Uytterhoeven | 1cfab8f | 2016-03-14 16:24:12 +0100 | [diff] [blame] | 2659 | /* Should be using gpiod_set_value_cansleep() */ |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2660 | WARN_ON(desc->gdev->chip->can_sleep); |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2661 | _gpiod_set_raw_value(desc, value); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2662 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2663 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2664 | |
| 2665 | /** |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2666 | * gpiod_set_value() - assign a gpio's value |
| 2667 | * @desc: gpio whose value will be assigned |
| 2668 | * @value: value to assign |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2669 | * |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2670 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into |
| 2671 | * account |
| 2672 | * |
| 2673 | * This function should be called from contexts where we cannot sleep, and will |
| 2674 | * complain if the GPIO chip functions potentially sleep. |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2675 | */ |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2676 | void gpiod_set_value(struct gpio_desc *desc, int value) |
| 2677 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2678 | VALIDATE_DESC_VOID(desc); |
Geert Uytterhoeven | 1cfab8f | 2016-03-14 16:24:12 +0100 | [diff] [blame] | 2679 | /* Should be using gpiod_set_value_cansleep() */ |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2680 | WARN_ON(desc->gdev->chip->can_sleep); |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2681 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| 2682 | value = !value; |
| 2683 | _gpiod_set_raw_value(desc, value); |
| 2684 | } |
| 2685 | EXPORT_SYMBOL_GPL(gpiod_set_value); |
| 2686 | |
| 2687 | /** |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2688 | * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2689 | * @array_size: number of elements in the descriptor / value arrays |
| 2690 | * @desc_array: array of GPIO descriptors whose values will be assigned |
| 2691 | * @value_array: array of values to assign |
| 2692 | * |
| 2693 | * Set the raw values of the GPIOs, i.e. the values of the physical lines |
| 2694 | * without regard for their ACTIVE_LOW status. |
| 2695 | * |
| 2696 | * This function should be called from contexts where we cannot sleep, and will |
| 2697 | * complain if the GPIO chip functions potentially sleep. |
| 2698 | */ |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2699 | void gpiod_set_raw_array_value(unsigned int array_size, |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2700 | struct gpio_desc **desc_array, int *value_array) |
| 2701 | { |
| 2702 | if (!desc_array) |
| 2703 | return; |
Linus Walleij | 44c7288 | 2016-04-24 11:36:59 +0200 | [diff] [blame] | 2704 | gpiod_set_array_value_complex(true, false, array_size, desc_array, |
| 2705 | value_array); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2706 | } |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2707 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2708 | |
| 2709 | /** |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2710 | * gpiod_set_array_value() - assign values to an array of GPIOs |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2711 | * @array_size: number of elements in the descriptor / value arrays |
| 2712 | * @desc_array: array of GPIO descriptors whose values will be assigned |
| 2713 | * @value_array: array of values to assign |
| 2714 | * |
| 2715 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status |
| 2716 | * into account. |
| 2717 | * |
| 2718 | * This function should be called from contexts where we cannot sleep, and will |
| 2719 | * complain if the GPIO chip functions potentially sleep. |
| 2720 | */ |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2721 | void gpiod_set_array_value(unsigned int array_size, |
| 2722 | struct gpio_desc **desc_array, int *value_array) |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2723 | { |
| 2724 | if (!desc_array) |
| 2725 | return; |
Linus Walleij | 44c7288 | 2016-04-24 11:36:59 +0200 | [diff] [blame] | 2726 | gpiod_set_array_value_complex(false, false, array_size, desc_array, |
| 2727 | value_array); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2728 | } |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2729 | EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2730 | |
| 2731 | /** |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2732 | * gpiod_cansleep() - report whether gpio value access may sleep |
| 2733 | * @desc: gpio to check |
| 2734 | * |
| 2735 | */ |
| 2736 | int gpiod_cansleep(const struct gpio_desc *desc) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2737 | { |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2738 | VALIDATE_DESC(desc); |
| 2739 | return desc->gdev->chip->can_sleep; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2740 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2741 | EXPORT_SYMBOL_GPL(gpiod_cansleep); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2742 | |
David Brownell | 0f6d504 | 2008-10-15 22:03:14 -0700 | [diff] [blame] | 2743 | /** |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2744 | * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
| 2745 | * @desc: gpio whose IRQ will be returned (already requested) |
David Brownell | 0f6d504 | 2008-10-15 22:03:14 -0700 | [diff] [blame] | 2746 | * |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2747 | * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
| 2748 | * error. |
David Brownell | 0f6d504 | 2008-10-15 22:03:14 -0700 | [diff] [blame] | 2749 | */ |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2750 | int gpiod_to_irq(const struct gpio_desc *desc) |
David Brownell | 0f6d504 | 2008-10-15 22:03:14 -0700 | [diff] [blame] | 2751 | { |
Linus Walleij | 4c37ce8 | 2016-05-02 13:13:10 +0200 | [diff] [blame] | 2752 | struct gpio_chip *chip; |
| 2753 | int offset; |
David Brownell | 0f6d504 | 2008-10-15 22:03:14 -0700 | [diff] [blame] | 2754 | |
Linus Walleij | 79bb71b | 2016-06-15 22:57:38 +0200 | [diff] [blame] | 2755 | /* |
| 2756 | * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics |
| 2757 | * requires this function to not return zero on an invalid descriptor |
| 2758 | * but rather a negative error number. |
| 2759 | */ |
Linus Walleij | bfbbe44 | 2016-06-16 11:55:55 +0200 | [diff] [blame] | 2760 | if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
Linus Walleij | 79bb71b | 2016-06-15 22:57:38 +0200 | [diff] [blame] | 2761 | return -EINVAL; |
| 2762 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2763 | chip = desc->gdev->chip; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2764 | offset = gpio_chip_hwgpio(desc); |
Linus Walleij | 4c37ce8 | 2016-05-02 13:13:10 +0200 | [diff] [blame] | 2765 | if (chip->to_irq) { |
| 2766 | int retirq = chip->to_irq(chip, offset); |
| 2767 | |
| 2768 | /* Zero means NO_IRQ */ |
| 2769 | if (!retirq) |
| 2770 | return -ENXIO; |
| 2771 | |
| 2772 | return retirq; |
| 2773 | } |
| 2774 | return -ENXIO; |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2775 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2776 | EXPORT_SYMBOL_GPL(gpiod_to_irq); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2777 | |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2778 | /** |
Alexandre Courbot | e3a2e87 | 2014-10-23 17:27:07 +0900 | [diff] [blame] | 2779 | * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
Alexandre Courbot | d74be6d | 2014-07-22 16:17:42 +0900 | [diff] [blame] | 2780 | * @chip: the chip the GPIO to lock belongs to |
| 2781 | * @offset: the offset of the GPIO to lock as IRQ |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2782 | * |
| 2783 | * This is used directly by GPIO drivers that want to lock down |
Linus Walleij | f438acd | 2014-03-07 10:12:49 +0800 | [diff] [blame] | 2784 | * a certain GPIO line to be used for IRQs. |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2785 | */ |
Alexandre Courbot | e3a2e87 | 2014-10-23 17:27:07 +0900 | [diff] [blame] | 2786 | int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2787 | { |
Linus Walleij | 9c10280 | 2016-05-25 10:56:03 +0200 | [diff] [blame] | 2788 | struct gpio_desc *desc; |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2789 | |
Linus Walleij | 9c10280 | 2016-05-25 10:56:03 +0200 | [diff] [blame] | 2790 | desc = gpiochip_get_desc(chip, offset); |
| 2791 | if (IS_ERR(desc)) |
| 2792 | return PTR_ERR(desc); |
| 2793 | |
Linus Walleij | 60f8339 | 2016-11-12 15:01:09 +0100 | [diff] [blame] | 2794 | /* |
| 2795 | * If it's fast: flush the direction setting if something changed |
| 2796 | * behind our back |
| 2797 | */ |
| 2798 | if (!chip->can_sleep && chip->get_direction) { |
Linus Walleij | 9c10280 | 2016-05-25 10:56:03 +0200 | [diff] [blame] | 2799 | int dir = chip->get_direction(chip, offset); |
| 2800 | |
| 2801 | if (dir) |
| 2802 | clear_bit(FLAG_IS_OUT, &desc->flags); |
| 2803 | else |
| 2804 | set_bit(FLAG_IS_OUT, &desc->flags); |
| 2805 | } |
| 2806 | |
| 2807 | if (test_bit(FLAG_IS_OUT, &desc->flags)) { |
Alexandre Courbot | d74be6d | 2014-07-22 16:17:42 +0900 | [diff] [blame] | 2808 | chip_err(chip, |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2809 | "%s: tried to flag a GPIO set as output for IRQ\n", |
| 2810 | __func__); |
| 2811 | return -EIO; |
| 2812 | } |
| 2813 | |
Linus Walleij | 9c10280 | 2016-05-25 10:56:03 +0200 | [diff] [blame] | 2814 | set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
Linus Walleij | 3940c34 | 2016-11-14 00:09:07 +0100 | [diff] [blame] | 2815 | |
| 2816 | /* |
| 2817 | * If the consumer has not set up a label (such as when the |
| 2818 | * IRQ is referenced from .to_irq()) we set up a label here |
| 2819 | * so it is clear this is used as an interrupt. |
| 2820 | */ |
| 2821 | if (!desc->label) |
| 2822 | desc_set_label(desc, "interrupt"); |
| 2823 | |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2824 | return 0; |
| 2825 | } |
Alexandre Courbot | e3a2e87 | 2014-10-23 17:27:07 +0900 | [diff] [blame] | 2826 | EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2827 | |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2828 | /** |
Alexandre Courbot | e3a2e87 | 2014-10-23 17:27:07 +0900 | [diff] [blame] | 2829 | * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
Alexandre Courbot | d74be6d | 2014-07-22 16:17:42 +0900 | [diff] [blame] | 2830 | * @chip: the chip the GPIO to lock belongs to |
| 2831 | * @offset: the offset of the GPIO to lock as IRQ |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2832 | * |
| 2833 | * This is used directly by GPIO drivers that want to indicate |
| 2834 | * that a certain GPIO is no longer used exclusively for IRQ. |
| 2835 | */ |
Alexandre Courbot | e3a2e87 | 2014-10-23 17:27:07 +0900 | [diff] [blame] | 2836 | void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset) |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2837 | { |
Linus Walleij | 3940c34 | 2016-11-14 00:09:07 +0100 | [diff] [blame] | 2838 | struct gpio_desc *desc; |
| 2839 | |
| 2840 | desc = gpiochip_get_desc(chip, offset); |
| 2841 | if (IS_ERR(desc)) |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2842 | return; |
| 2843 | |
Linus Walleij | 3940c34 | 2016-11-14 00:09:07 +0100 | [diff] [blame] | 2844 | clear_bit(FLAG_USED_AS_IRQ, &desc->flags); |
| 2845 | |
| 2846 | /* If we only had this marking, erase it */ |
| 2847 | if (desc->label && !strcmp(desc->label, "interrupt")) |
| 2848 | desc_set_label(desc, NULL); |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2849 | } |
Alexandre Courbot | e3a2e87 | 2014-10-23 17:27:07 +0900 | [diff] [blame] | 2850 | EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 2851 | |
Linus Walleij | 6cee382 | 2016-02-11 20:16:45 +0100 | [diff] [blame] | 2852 | bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset) |
| 2853 | { |
| 2854 | if (offset >= chip->ngpio) |
| 2855 | return false; |
| 2856 | |
| 2857 | return test_bit(FLAG_USED_AS_IRQ, &chip->gpiodev->descs[offset].flags); |
| 2858 | } |
| 2859 | EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); |
| 2860 | |
Linus Walleij | 143b65d | 2016-02-16 15:41:42 +0100 | [diff] [blame] | 2861 | bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset) |
| 2862 | { |
| 2863 | if (offset >= chip->ngpio) |
| 2864 | return false; |
| 2865 | |
| 2866 | return test_bit(FLAG_OPEN_DRAIN, &chip->gpiodev->descs[offset].flags); |
| 2867 | } |
| 2868 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); |
| 2869 | |
| 2870 | bool gpiochip_line_is_open_source(struct gpio_chip *chip, unsigned int offset) |
| 2871 | { |
| 2872 | if (offset >= chip->ngpio) |
| 2873 | return false; |
| 2874 | |
| 2875 | return test_bit(FLAG_OPEN_SOURCE, &chip->gpiodev->descs[offset].flags); |
| 2876 | } |
| 2877 | EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); |
| 2878 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2879 | /** |
| 2880 | * gpiod_get_raw_value_cansleep() - return a gpio's raw value |
| 2881 | * @desc: gpio whose value will be returned |
| 2882 | * |
| 2883 | * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
Bjorn Andersson | e20538b | 2015-08-28 09:44:18 -0700 | [diff] [blame] | 2884 | * its ACTIVE_LOW status, or negative errno on failure. |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2885 | * |
| 2886 | * This function is to be called from contexts that can sleep. |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2887 | */ |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2888 | int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2889 | { |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2890 | might_sleep_if(extra_checks); |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2891 | VALIDATE_DESC(desc); |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2892 | return _gpiod_get_raw_value(desc); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2893 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2894 | EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2895 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2896 | /** |
| 2897 | * gpiod_get_value_cansleep() - return a gpio's value |
| 2898 | * @desc: gpio whose value will be returned |
| 2899 | * |
| 2900 | * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into |
Bjorn Andersson | e20538b | 2015-08-28 09:44:18 -0700 | [diff] [blame] | 2901 | * account, or negative errno on failure. |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2902 | * |
| 2903 | * This function is to be called from contexts that can sleep. |
| 2904 | */ |
| 2905 | int gpiod_get_value_cansleep(const struct gpio_desc *desc) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2906 | { |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2907 | int value; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2908 | |
| 2909 | might_sleep_if(extra_checks); |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2910 | VALIDATE_DESC(desc); |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2911 | value = _gpiod_get_raw_value(desc); |
Bjorn Andersson | e20538b | 2015-08-28 09:44:18 -0700 | [diff] [blame] | 2912 | if (value < 0) |
| 2913 | return value; |
| 2914 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2915 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| 2916 | value = !value; |
| 2917 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2918 | return value; |
| 2919 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2920 | EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2921 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2922 | /** |
| 2923 | * gpiod_set_raw_value_cansleep() - assign a gpio's raw value |
| 2924 | * @desc: gpio whose value will be assigned |
| 2925 | * @value: value to assign |
| 2926 | * |
| 2927 | * Set the raw value of the GPIO, i.e. the value of its physical line without |
| 2928 | * regard for its ACTIVE_LOW status. |
| 2929 | * |
| 2930 | * This function is to be called from contexts that can sleep. |
| 2931 | */ |
| 2932 | void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2933 | { |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2934 | might_sleep_if(extra_checks); |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2935 | VALIDATE_DESC_VOID(desc); |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2936 | _gpiod_set_raw_value(desc, value); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2937 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2938 | EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2939 | |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2940 | /** |
| 2941 | * gpiod_set_value_cansleep() - assign a gpio's value |
| 2942 | * @desc: gpio whose value will be assigned |
| 2943 | * @value: value to assign |
| 2944 | * |
| 2945 | * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into |
| 2946 | * account |
| 2947 | * |
| 2948 | * This function is to be called from contexts that can sleep. |
| 2949 | */ |
| 2950 | void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 2951 | { |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2952 | might_sleep_if(extra_checks); |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 2953 | VALIDATE_DESC_VOID(desc); |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2954 | if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| 2955 | value = !value; |
| 2956 | _gpiod_set_raw_value(desc, value); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2957 | } |
Alexandre Courbot | 79a9bec | 2013-10-17 10:21:36 -0700 | [diff] [blame] | 2958 | EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 2959 | |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 2960 | /** |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2961 | * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2962 | * @array_size: number of elements in the descriptor / value arrays |
| 2963 | * @desc_array: array of GPIO descriptors whose values will be assigned |
| 2964 | * @value_array: array of values to assign |
| 2965 | * |
| 2966 | * Set the raw values of the GPIOs, i.e. the values of the physical lines |
| 2967 | * without regard for their ACTIVE_LOW status. |
| 2968 | * |
| 2969 | * This function is to be called from contexts that can sleep. |
| 2970 | */ |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2971 | void gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
| 2972 | struct gpio_desc **desc_array, |
| 2973 | int *value_array) |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2974 | { |
| 2975 | might_sleep_if(extra_checks); |
| 2976 | if (!desc_array) |
| 2977 | return; |
Linus Walleij | 44c7288 | 2016-04-24 11:36:59 +0200 | [diff] [blame] | 2978 | gpiod_set_array_value_complex(true, true, array_size, desc_array, |
| 2979 | value_array); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2980 | } |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2981 | EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2982 | |
| 2983 | /** |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2984 | * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2985 | * @array_size: number of elements in the descriptor / value arrays |
| 2986 | * @desc_array: array of GPIO descriptors whose values will be assigned |
| 2987 | * @value_array: array of values to assign |
| 2988 | * |
| 2989 | * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status |
| 2990 | * into account. |
| 2991 | * |
| 2992 | * This function is to be called from contexts that can sleep. |
| 2993 | */ |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 2994 | void gpiod_set_array_value_cansleep(unsigned int array_size, |
| 2995 | struct gpio_desc **desc_array, |
| 2996 | int *value_array) |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 2997 | { |
| 2998 | might_sleep_if(extra_checks); |
| 2999 | if (!desc_array) |
| 3000 | return; |
Linus Walleij | 44c7288 | 2016-04-24 11:36:59 +0200 | [diff] [blame] | 3001 | gpiod_set_array_value_complex(false, true, array_size, desc_array, |
| 3002 | value_array); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 3003 | } |
Rojhalat Ibrahim | 3fff99b | 2015-05-13 11:04:56 +0200 | [diff] [blame] | 3004 | EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
Rojhalat Ibrahim | 5f42424 | 2014-11-04 17:12:06 +0100 | [diff] [blame] | 3005 | |
| 3006 | /** |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3007 | * gpiod_add_lookup_table() - register GPIO device consumers |
| 3008 | * @table: table of consumers to register |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3009 | */ |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3010 | void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3011 | { |
| 3012 | mutex_lock(&gpio_lookup_lock); |
| 3013 | |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3014 | list_add_tail(&table->list, &gpio_lookup_list); |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3015 | |
| 3016 | mutex_unlock(&gpio_lookup_lock); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3017 | } |
| 3018 | |
Shobhit Kumar | be9015a | 2015-06-26 14:32:04 +0530 | [diff] [blame] | 3019 | /** |
| 3020 | * gpiod_remove_lookup_table() - unregister GPIO device consumers |
| 3021 | * @table: table of consumers to unregister |
| 3022 | */ |
| 3023 | void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) |
| 3024 | { |
| 3025 | mutex_lock(&gpio_lookup_lock); |
| 3026 | |
| 3027 | list_del(&table->list); |
| 3028 | |
| 3029 | mutex_unlock(&gpio_lookup_lock); |
| 3030 | } |
| 3031 | |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3032 | static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
| 3033 | { |
| 3034 | const char *dev_id = dev ? dev_name(dev) : NULL; |
| 3035 | struct gpiod_lookup_table *table; |
| 3036 | |
| 3037 | mutex_lock(&gpio_lookup_lock); |
| 3038 | |
| 3039 | list_for_each_entry(table, &gpio_lookup_list, list) { |
| 3040 | if (table->dev_id && dev_id) { |
| 3041 | /* |
| 3042 | * Valid strings on both ends, must be identical to have |
| 3043 | * a match |
| 3044 | */ |
| 3045 | if (!strcmp(table->dev_id, dev_id)) |
| 3046 | goto found; |
| 3047 | } else { |
| 3048 | /* |
| 3049 | * One of the pointers is NULL, so both must be to have |
| 3050 | * a match |
| 3051 | */ |
| 3052 | if (dev_id == table->dev_id) |
| 3053 | goto found; |
| 3054 | } |
| 3055 | } |
| 3056 | table = NULL; |
| 3057 | |
| 3058 | found: |
| 3059 | mutex_unlock(&gpio_lookup_lock); |
| 3060 | return table; |
| 3061 | } |
| 3062 | |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3063 | static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
Alexandre Courbot | 53e7cac | 2013-11-16 21:44:52 +0900 | [diff] [blame] | 3064 | unsigned int idx, |
| 3065 | enum gpio_lookup_flags *flags) |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3066 | { |
Alexandre Courbot | 2a3cf6a | 2013-12-11 11:32:28 +0900 | [diff] [blame] | 3067 | struct gpio_desc *desc = ERR_PTR(-ENOENT); |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3068 | struct gpiod_lookup_table *table; |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3069 | struct gpiod_lookup *p; |
| 3070 | |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3071 | table = gpiod_find_lookup_table(dev); |
| 3072 | if (!table) |
| 3073 | return desc; |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3074 | |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3075 | for (p = &table->table[0]; p->chip_label; p++) { |
| 3076 | struct gpio_chip *chip; |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3077 | |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3078 | /* idx must always match exactly */ |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3079 | if (p->idx != idx) |
| 3080 | continue; |
| 3081 | |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3082 | /* If the lookup entry has a con_id, require exact match */ |
| 3083 | if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) |
| 3084 | continue; |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3085 | |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3086 | chip = find_chip_by_name(p->chip_label); |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3087 | |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3088 | if (!chip) { |
Alexandre Courbot | 2a3cf6a | 2013-12-11 11:32:28 +0900 | [diff] [blame] | 3089 | dev_err(dev, "cannot find GPIO chip %s\n", |
| 3090 | p->chip_label); |
| 3091 | return ERR_PTR(-ENODEV); |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3092 | } |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3093 | |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3094 | if (chip->ngpio <= p->chip_hwnum) { |
Alexandre Courbot | 2a3cf6a | 2013-12-11 11:32:28 +0900 | [diff] [blame] | 3095 | dev_err(dev, |
| 3096 | "requested GPIO %d is out of range [0..%d] for chip %s\n", |
| 3097 | idx, chip->ngpio, chip->label); |
| 3098 | return ERR_PTR(-EINVAL); |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3099 | } |
| 3100 | |
Alexandre Courbot | bb1e88c | 2014-02-09 17:43:54 +0900 | [diff] [blame] | 3101 | desc = gpiochip_get_desc(chip, p->chip_hwnum); |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3102 | *flags = p->flags; |
Alexandre Courbot | 2a3cf6a | 2013-12-11 11:32:28 +0900 | [diff] [blame] | 3103 | |
| 3104 | return desc; |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3105 | } |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3106 | |
| 3107 | return desc; |
| 3108 | } |
| 3109 | |
Rojhalat Ibrahim | 6685852 | 2015-02-11 17:27:58 +0100 | [diff] [blame] | 3110 | static int dt_gpio_count(struct device *dev, const char *con_id) |
| 3111 | { |
| 3112 | int ret; |
| 3113 | char propname[32]; |
| 3114 | unsigned int i; |
| 3115 | |
| 3116 | for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
| 3117 | if (con_id) |
| 3118 | snprintf(propname, sizeof(propname), "%s-%s", |
| 3119 | con_id, gpio_suffixes[i]); |
| 3120 | else |
| 3121 | snprintf(propname, sizeof(propname), "%s", |
| 3122 | gpio_suffixes[i]); |
| 3123 | |
| 3124 | ret = of_gpio_named_count(dev->of_node, propname); |
Andy Shevchenko | 4033d4a | 2017-02-20 18:15:47 +0200 | [diff] [blame] | 3125 | if (ret > 0) |
Rojhalat Ibrahim | 6685852 | 2015-02-11 17:27:58 +0100 | [diff] [blame] | 3126 | break; |
| 3127 | } |
Andy Shevchenko | 4033d4a | 2017-02-20 18:15:47 +0200 | [diff] [blame] | 3128 | return ret ? ret : -ENOENT; |
Rojhalat Ibrahim | 6685852 | 2015-02-11 17:27:58 +0100 | [diff] [blame] | 3129 | } |
| 3130 | |
| 3131 | static int platform_gpio_count(struct device *dev, const char *con_id) |
| 3132 | { |
| 3133 | struct gpiod_lookup_table *table; |
| 3134 | struct gpiod_lookup *p; |
| 3135 | unsigned int count = 0; |
| 3136 | |
| 3137 | table = gpiod_find_lookup_table(dev); |
| 3138 | if (!table) |
| 3139 | return -ENOENT; |
| 3140 | |
| 3141 | for (p = &table->table[0]; p->chip_label; p++) { |
| 3142 | if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || |
| 3143 | (!con_id && !p->con_id)) |
| 3144 | count++; |
| 3145 | } |
| 3146 | if (!count) |
| 3147 | return -ENOENT; |
| 3148 | |
| 3149 | return count; |
| 3150 | } |
| 3151 | |
| 3152 | /** |
| 3153 | * gpiod_count - return the number of GPIOs associated with a device / function |
| 3154 | * or -ENOENT if no GPIO has been assigned to the requested function |
| 3155 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| 3156 | * @con_id: function within the GPIO consumer |
| 3157 | */ |
| 3158 | int gpiod_count(struct device *dev, const char *con_id) |
| 3159 | { |
| 3160 | int count = -ENOENT; |
| 3161 | |
| 3162 | if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node) |
| 3163 | count = dt_gpio_count(dev, con_id); |
| 3164 | else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev)) |
| 3165 | count = acpi_gpio_count(dev, con_id); |
| 3166 | |
| 3167 | if (count < 0) |
| 3168 | count = platform_gpio_count(dev, con_id); |
| 3169 | |
| 3170 | return count; |
| 3171 | } |
| 3172 | EXPORT_SYMBOL_GPL(gpiod_count); |
| 3173 | |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3174 | /** |
Thierry Reding | 0879162 | 2014-04-25 16:54:22 +0200 | [diff] [blame] | 3175 | * gpiod_get - obtain a GPIO for a given GPIO function |
Alexandre Courbot | ad82478 | 2013-12-03 12:20:11 +0900 | [diff] [blame] | 3176 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3177 | * @con_id: function within the GPIO consumer |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3178 | * @flags: optional GPIO initialization flags |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3179 | * |
| 3180 | * Return the GPIO descriptor corresponding to the function con_id of device |
Alexandre Courbot | 2a3cf6a | 2013-12-11 11:32:28 +0900 | [diff] [blame] | 3181 | * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
Colin Cronin | 20a8a96 | 2015-05-18 11:41:43 -0700 | [diff] [blame] | 3182 | * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3183 | */ |
Uwe Kleine-König | b17d1bf | 2015-02-11 11:52:37 +0100 | [diff] [blame] | 3184 | struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3185 | enum gpiod_flags flags) |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3186 | { |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3187 | return gpiod_get_index(dev, con_id, 0, flags); |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3188 | } |
Uwe Kleine-König | b17d1bf | 2015-02-11 11:52:37 +0100 | [diff] [blame] | 3189 | EXPORT_SYMBOL_GPL(gpiod_get); |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3190 | |
| 3191 | /** |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3192 | * gpiod_get_optional - obtain an optional GPIO for a given GPIO function |
| 3193 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| 3194 | * @con_id: function within the GPIO consumer |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3195 | * @flags: optional GPIO initialization flags |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3196 | * |
| 3197 | * This is equivalent to gpiod_get(), except that when no GPIO was assigned to |
| 3198 | * the requested function it will return NULL. This is convenient for drivers |
| 3199 | * that need to handle optional GPIOs. |
| 3200 | */ |
Uwe Kleine-König | b17d1bf | 2015-02-11 11:52:37 +0100 | [diff] [blame] | 3201 | struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3202 | const char *con_id, |
| 3203 | enum gpiod_flags flags) |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3204 | { |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3205 | return gpiod_get_index_optional(dev, con_id, 0, flags); |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3206 | } |
Uwe Kleine-König | b17d1bf | 2015-02-11 11:52:37 +0100 | [diff] [blame] | 3207 | EXPORT_SYMBOL_GPL(gpiod_get_optional); |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3208 | |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 3209 | |
| 3210 | /** |
| 3211 | * gpiod_configure_flags - helper function to configure a given GPIO |
| 3212 | * @desc: gpio whose value will be assigned |
| 3213 | * @con_id: function within the GPIO consumer |
Johan Hovold | 85b03b3 | 2016-07-03 18:32:05 +0200 | [diff] [blame] | 3214 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
| 3215 | * of_get_gpio_hog() |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 3216 | * @dflags: gpiod_flags - optional GPIO initialization flags |
| 3217 | * |
| 3218 | * Return 0 on success, -ENOENT if no GPIO has been assigned to the |
| 3219 | * requested function and/or index, or another IS_ERR() code if an error |
| 3220 | * occurred while trying to acquire the GPIO. |
| 3221 | */ |
| 3222 | static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, |
Johan Hovold | 85b03b3 | 2016-07-03 18:32:05 +0200 | [diff] [blame] | 3223 | unsigned long lflags, enum gpiod_flags dflags) |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 3224 | { |
| 3225 | int status; |
| 3226 | |
Johan Hovold | 85b03b3 | 2016-07-03 18:32:05 +0200 | [diff] [blame] | 3227 | if (lflags & GPIO_ACTIVE_LOW) |
| 3228 | set_bit(FLAG_ACTIVE_LOW, &desc->flags); |
| 3229 | if (lflags & GPIO_OPEN_DRAIN) |
| 3230 | set_bit(FLAG_OPEN_DRAIN, &desc->flags); |
| 3231 | if (lflags & GPIO_OPEN_SOURCE) |
| 3232 | set_bit(FLAG_OPEN_SOURCE, &desc->flags); |
| 3233 | |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 3234 | /* No particular flag request, return here... */ |
| 3235 | if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { |
| 3236 | pr_debug("no flags found for %s\n", con_id); |
| 3237 | return 0; |
| 3238 | } |
| 3239 | |
| 3240 | /* Process flags */ |
| 3241 | if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) |
| 3242 | status = gpiod_direction_output(desc, |
Linus Walleij | ad17731 | 2016-11-13 23:02:44 +0100 | [diff] [blame] | 3243 | !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL)); |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 3244 | else |
| 3245 | status = gpiod_direction_input(desc); |
| 3246 | |
| 3247 | return status; |
| 3248 | } |
| 3249 | |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3250 | /** |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3251 | * gpiod_get_index - obtain a GPIO from a multi-index GPIO function |
Andy Shevchenko | fdd6a5f | 2013-12-05 11:26:26 +0200 | [diff] [blame] | 3252 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3253 | * @con_id: function within the GPIO consumer |
| 3254 | * @idx: index of the GPIO to obtain in the consumer |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3255 | * @flags: optional GPIO initialization flags |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3256 | * |
| 3257 | * This variant of gpiod_get() allows to access GPIOs other than the first |
| 3258 | * defined one for functions that define several GPIOs. |
| 3259 | * |
Alexandre Courbot | 2a3cf6a | 2013-12-11 11:32:28 +0900 | [diff] [blame] | 3260 | * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
| 3261 | * requested function and/or index, or another IS_ERR() code if an error |
Colin Cronin | 20a8a96 | 2015-05-18 11:41:43 -0700 | [diff] [blame] | 3262 | * occurred while trying to acquire the GPIO. |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3263 | */ |
Uwe Kleine-König | b17d1bf | 2015-02-11 11:52:37 +0100 | [diff] [blame] | 3264 | struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3265 | const char *con_id, |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3266 | unsigned int idx, |
| 3267 | enum gpiod_flags flags) |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3268 | { |
Alexandre Courbot | 35c5d7f | 2013-11-23 19:34:50 +0900 | [diff] [blame] | 3269 | struct gpio_desc *desc = NULL; |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3270 | int status; |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3271 | enum gpio_lookup_flags lookupflags = 0; |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3272 | |
| 3273 | dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); |
| 3274 | |
Rafael J. Wysocki | 4d8440b | 2015-03-10 23:08:57 +0100 | [diff] [blame] | 3275 | if (dev) { |
| 3276 | /* Using device tree? */ |
| 3277 | if (IS_ENABLED(CONFIG_OF) && dev->of_node) { |
| 3278 | dev_dbg(dev, "using device tree for GPIO lookup\n"); |
| 3279 | desc = of_find_gpio(dev, con_id, idx, &lookupflags); |
| 3280 | } else if (ACPI_COMPANION(dev)) { |
| 3281 | dev_dbg(dev, "using ACPI for GPIO lookup\n"); |
Dmitry Torokhov | 2548753 | 2016-03-24 10:50:25 -0700 | [diff] [blame] | 3282 | desc = acpi_find_gpio(dev, con_id, idx, flags, &lookupflags); |
Rafael J. Wysocki | 4d8440b | 2015-03-10 23:08:57 +0100 | [diff] [blame] | 3283 | } |
Alexandre Courbot | 35c5d7f | 2013-11-23 19:34:50 +0900 | [diff] [blame] | 3284 | } |
| 3285 | |
| 3286 | /* |
| 3287 | * Either we are not using DT or ACPI, or their lookup did not return |
| 3288 | * a result. In that case, use platform lookup as a fallback. |
| 3289 | */ |
Alexandre Courbot | 2a3cf6a | 2013-12-11 11:32:28 +0900 | [diff] [blame] | 3290 | if (!desc || desc == ERR_PTR(-ENOENT)) { |
Alexander Shiyan | 43a8785 | 2014-09-19 11:39:25 +0400 | [diff] [blame] | 3291 | dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3292 | desc = gpiod_find(dev, con_id, idx, &lookupflags); |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3293 | } |
| 3294 | |
| 3295 | if (IS_ERR(desc)) { |
Heikki Krogerus | 351cfe0 | 2013-11-29 15:47:34 +0200 | [diff] [blame] | 3296 | dev_dbg(dev, "lookup for GPIO %s failed\n", con_id); |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3297 | return desc; |
| 3298 | } |
| 3299 | |
| 3300 | status = gpiod_request(desc, con_id); |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3301 | if (status < 0) |
| 3302 | return ERR_PTR(status); |
| 3303 | |
Johan Hovold | 85b03b3 | 2016-07-03 18:32:05 +0200 | [diff] [blame] | 3304 | status = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3305 | if (status < 0) { |
| 3306 | dev_dbg(dev, "setup of GPIO %s failed\n", con_id); |
| 3307 | gpiod_put(desc); |
| 3308 | return ERR_PTR(status); |
| 3309 | } |
| 3310 | |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3311 | return desc; |
| 3312 | } |
Uwe Kleine-König | b17d1bf | 2015-02-11 11:52:37 +0100 | [diff] [blame] | 3313 | EXPORT_SYMBOL_GPL(gpiod_get_index); |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3314 | |
| 3315 | /** |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3316 | * fwnode_get_named_gpiod - obtain a GPIO from firmware node |
| 3317 | * @fwnode: handle of the firmware node |
| 3318 | * @propname: name of the firmware property representing the GPIO |
Boris Brezillon | 537b94d | 2017-02-02 14:53:11 +0100 | [diff] [blame] | 3319 | * @index: index of the GPIO to obtain in the consumer |
Andy Shevchenko | a264d10 | 2017-01-09 16:02:28 +0200 | [diff] [blame] | 3320 | * @dflags: GPIO initialization flags |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3321 | * |
| 3322 | * This function can be used for drivers that get their configuration |
| 3323 | * from firmware. |
| 3324 | * |
| 3325 | * Function properly finds the corresponding GPIO using whatever is the |
| 3326 | * underlying firmware interface and then makes sure that the GPIO |
| 3327 | * descriptor is requested before it is returned to the caller. |
| 3328 | * |
Andy Shevchenko | ff21378 | 2017-02-28 17:03:12 +0200 | [diff] [blame] | 3329 | * On successful request the GPIO pin is configured in accordance with |
Andy Shevchenko | a264d10 | 2017-01-09 16:02:28 +0200 | [diff] [blame] | 3330 | * provided @dflags. |
| 3331 | * |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3332 | * In case of error an ERR_PTR() is returned. |
| 3333 | */ |
| 3334 | struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, |
Boris Brezillon | 537b94d | 2017-02-02 14:53:11 +0100 | [diff] [blame] | 3335 | const char *propname, int index, |
Alexander Stein | b2987d7 | 2017-01-12 17:39:24 +0100 | [diff] [blame] | 3336 | enum gpiod_flags dflags, |
| 3337 | const char *label) |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3338 | { |
| 3339 | struct gpio_desc *desc = ERR_PTR(-ENODEV); |
Andy Shevchenko | a264d10 | 2017-01-09 16:02:28 +0200 | [diff] [blame] | 3340 | unsigned long lflags = 0; |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3341 | bool active_low = false; |
Laurent Pinchart | 90b665f | 2015-10-13 00:20:21 +0300 | [diff] [blame] | 3342 | bool single_ended = false; |
Laxman Dewangan | 4c0facd | 2017-04-06 19:05:52 +0530 | [diff] [blame] | 3343 | bool open_drain = false; |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3344 | int ret; |
| 3345 | |
| 3346 | if (!fwnode) |
| 3347 | return ERR_PTR(-EINVAL); |
| 3348 | |
| 3349 | if (is_of_node(fwnode)) { |
| 3350 | enum of_gpio_flags flags; |
| 3351 | |
Boris Brezillon | 537b94d | 2017-02-02 14:53:11 +0100 | [diff] [blame] | 3352 | desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname, |
| 3353 | index, &flags); |
Laurent Pinchart | 90b665f | 2015-10-13 00:20:21 +0300 | [diff] [blame] | 3354 | if (!IS_ERR(desc)) { |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3355 | active_low = flags & OF_GPIO_ACTIVE_LOW; |
Laurent Pinchart | 90b665f | 2015-10-13 00:20:21 +0300 | [diff] [blame] | 3356 | single_ended = flags & OF_GPIO_SINGLE_ENDED; |
Laxman Dewangan | 4c0facd | 2017-04-06 19:05:52 +0530 | [diff] [blame] | 3357 | open_drain = flags & OF_GPIO_OPEN_DRAIN; |
Laurent Pinchart | 90b665f | 2015-10-13 00:20:21 +0300 | [diff] [blame] | 3358 | } |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3359 | } else if (is_acpi_node(fwnode)) { |
| 3360 | struct acpi_gpio_info info; |
| 3361 | |
Boris Brezillon | 537b94d | 2017-02-02 14:53:11 +0100 | [diff] [blame] | 3362 | desc = acpi_node_get_gpiod(fwnode, propname, index, &info); |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3363 | if (!IS_ERR(desc)) |
Christophe RICARD | 5204472 | 2015-12-23 23:25:34 +0100 | [diff] [blame] | 3364 | active_low = info.polarity == GPIO_ACTIVE_LOW; |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3365 | } |
| 3366 | |
| 3367 | if (IS_ERR(desc)) |
| 3368 | return desc; |
| 3369 | |
Alexander Stein | b2987d7 | 2017-01-12 17:39:24 +0100 | [diff] [blame] | 3370 | ret = gpiod_request(desc, label); |
Johan Hovold | 85b03b3 | 2016-07-03 18:32:05 +0200 | [diff] [blame] | 3371 | if (ret) |
| 3372 | return ERR_PTR(ret); |
| 3373 | |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3374 | if (active_low) |
Andy Shevchenko | a264d10 | 2017-01-09 16:02:28 +0200 | [diff] [blame] | 3375 | lflags |= GPIO_ACTIVE_LOW; |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3376 | |
Laurent Pinchart | 90b665f | 2015-10-13 00:20:21 +0300 | [diff] [blame] | 3377 | if (single_ended) { |
Laxman Dewangan | 4c0facd | 2017-04-06 19:05:52 +0530 | [diff] [blame] | 3378 | if (open_drain) |
Andy Shevchenko | a264d10 | 2017-01-09 16:02:28 +0200 | [diff] [blame] | 3379 | lflags |= GPIO_OPEN_DRAIN; |
Laurent Pinchart | 90b665f | 2015-10-13 00:20:21 +0300 | [diff] [blame] | 3380 | else |
Andy Shevchenko | a264d10 | 2017-01-09 16:02:28 +0200 | [diff] [blame] | 3381 | lflags |= GPIO_OPEN_SOURCE; |
| 3382 | } |
| 3383 | |
| 3384 | ret = gpiod_configure_flags(desc, propname, lflags, dflags); |
| 3385 | if (ret < 0) { |
| 3386 | gpiod_put(desc); |
| 3387 | return ERR_PTR(ret); |
Laurent Pinchart | 90b665f | 2015-10-13 00:20:21 +0300 | [diff] [blame] | 3388 | } |
| 3389 | |
Mika Westerberg | 40b7318 | 2014-10-21 13:33:59 +0200 | [diff] [blame] | 3390 | return desc; |
| 3391 | } |
| 3392 | EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); |
| 3393 | |
| 3394 | /** |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3395 | * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO |
| 3396 | * function |
| 3397 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| 3398 | * @con_id: function within the GPIO consumer |
| 3399 | * @index: index of the GPIO to obtain in the consumer |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3400 | * @flags: optional GPIO initialization flags |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3401 | * |
| 3402 | * This is equivalent to gpiod_get_index(), except that when no GPIO with the |
| 3403 | * specified index was assigned to the requested function it will return NULL. |
| 3404 | * This is convenient for drivers that need to handle optional GPIOs. |
| 3405 | */ |
Uwe Kleine-König | b17d1bf | 2015-02-11 11:52:37 +0100 | [diff] [blame] | 3406 | struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3407 | const char *con_id, |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3408 | unsigned int index, |
| 3409 | enum gpiod_flags flags) |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3410 | { |
| 3411 | struct gpio_desc *desc; |
| 3412 | |
Alexandre Courbot | 39b2bbe | 2014-07-25 23:38:36 +0900 | [diff] [blame] | 3413 | desc = gpiod_get_index(dev, con_id, index, flags); |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3414 | if (IS_ERR(desc)) { |
| 3415 | if (PTR_ERR(desc) == -ENOENT) |
| 3416 | return NULL; |
| 3417 | } |
| 3418 | |
| 3419 | return desc; |
| 3420 | } |
Uwe Kleine-König | b17d1bf | 2015-02-11 11:52:37 +0100 | [diff] [blame] | 3421 | EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
Thierry Reding | 29a1f233 | 2014-04-25 17:10:06 +0200 | [diff] [blame] | 3422 | |
| 3423 | /** |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 3424 | * gpiod_hog - Hog the specified GPIO desc given the provided flags |
| 3425 | * @desc: gpio whose value will be assigned |
| 3426 | * @name: gpio line name |
| 3427 | * @lflags: gpio_lookup_flags - returned from of_find_gpio() or |
| 3428 | * of_get_gpio_hog() |
| 3429 | * @dflags: gpiod_flags - optional GPIO initialization flags |
| 3430 | */ |
| 3431 | int gpiod_hog(struct gpio_desc *desc, const char *name, |
| 3432 | unsigned long lflags, enum gpiod_flags dflags) |
| 3433 | { |
| 3434 | struct gpio_chip *chip; |
| 3435 | struct gpio_desc *local_desc; |
| 3436 | int hwnum; |
| 3437 | int status; |
| 3438 | |
| 3439 | chip = gpiod_to_chip(desc); |
| 3440 | hwnum = gpio_chip_hwgpio(desc); |
| 3441 | |
| 3442 | local_desc = gpiochip_request_own_desc(chip, hwnum, name); |
| 3443 | if (IS_ERR(local_desc)) { |
Laxman Dewangan | c31a571 | 2016-03-11 19:13:21 +0530 | [diff] [blame] | 3444 | status = PTR_ERR(local_desc); |
| 3445 | pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", |
| 3446 | name, chip->label, hwnum, status); |
| 3447 | return status; |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 3448 | } |
| 3449 | |
Johan Hovold | 85b03b3 | 2016-07-03 18:32:05 +0200 | [diff] [blame] | 3450 | status = gpiod_configure_flags(desc, name, lflags, dflags); |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 3451 | if (status < 0) { |
Laxman Dewangan | c31a571 | 2016-03-11 19:13:21 +0530 | [diff] [blame] | 3452 | pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n", |
| 3453 | name, chip->label, hwnum, status); |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 3454 | gpiochip_free_own_desc(desc); |
| 3455 | return status; |
| 3456 | } |
| 3457 | |
| 3458 | /* Mark GPIO as hogged so it can be identified and removed later */ |
| 3459 | set_bit(FLAG_IS_HOGGED, &desc->flags); |
| 3460 | |
| 3461 | pr_info("GPIO line %d (%s) hogged as %s%s\n", |
| 3462 | desc_to_gpio(desc), name, |
| 3463 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", |
| 3464 | (dflags&GPIOD_FLAGS_BIT_DIR_OUT) ? |
| 3465 | (dflags&GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low":""); |
| 3466 | |
| 3467 | return 0; |
| 3468 | } |
| 3469 | |
| 3470 | /** |
| 3471 | * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog |
| 3472 | * @chip: gpio chip to act on |
| 3473 | * |
| 3474 | * This is only used by of_gpiochip_remove to free hogged gpios |
| 3475 | */ |
| 3476 | static void gpiochip_free_hogs(struct gpio_chip *chip) |
| 3477 | { |
| 3478 | int id; |
| 3479 | |
| 3480 | for (id = 0; id < chip->ngpio; id++) { |
Linus Walleij | 1c3cdb1 | 2016-02-09 13:51:59 +0100 | [diff] [blame] | 3481 | if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags)) |
| 3482 | gpiochip_free_own_desc(&chip->gpiodev->descs[id]); |
Benoit Parrot | f625d46 | 2015-02-02 11:44:44 -0600 | [diff] [blame] | 3483 | } |
| 3484 | } |
| 3485 | |
| 3486 | /** |
Rojhalat Ibrahim | 6685852 | 2015-02-11 17:27:58 +0100 | [diff] [blame] | 3487 | * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function |
| 3488 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| 3489 | * @con_id: function within the GPIO consumer |
| 3490 | * @flags: optional GPIO initialization flags |
| 3491 | * |
| 3492 | * This function acquires all the GPIOs defined under a given function. |
| 3493 | * |
| 3494 | * Return a struct gpio_descs containing an array of descriptors, -ENOENT if |
| 3495 | * no GPIO has been assigned to the requested function, or another IS_ERR() |
| 3496 | * code if an error occurred while trying to acquire the GPIOs. |
| 3497 | */ |
| 3498 | struct gpio_descs *__must_check gpiod_get_array(struct device *dev, |
| 3499 | const char *con_id, |
| 3500 | enum gpiod_flags flags) |
| 3501 | { |
| 3502 | struct gpio_desc *desc; |
| 3503 | struct gpio_descs *descs; |
| 3504 | int count; |
| 3505 | |
| 3506 | count = gpiod_count(dev, con_id); |
| 3507 | if (count < 0) |
| 3508 | return ERR_PTR(count); |
| 3509 | |
| 3510 | descs = kzalloc(sizeof(*descs) + sizeof(descs->desc[0]) * count, |
| 3511 | GFP_KERNEL); |
| 3512 | if (!descs) |
| 3513 | return ERR_PTR(-ENOMEM); |
| 3514 | |
| 3515 | for (descs->ndescs = 0; descs->ndescs < count; ) { |
| 3516 | desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); |
| 3517 | if (IS_ERR(desc)) { |
| 3518 | gpiod_put_array(descs); |
| 3519 | return ERR_CAST(desc); |
| 3520 | } |
| 3521 | descs->desc[descs->ndescs] = desc; |
| 3522 | descs->ndescs++; |
| 3523 | } |
| 3524 | return descs; |
| 3525 | } |
| 3526 | EXPORT_SYMBOL_GPL(gpiod_get_array); |
| 3527 | |
| 3528 | /** |
| 3529 | * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO |
| 3530 | * function |
| 3531 | * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| 3532 | * @con_id: function within the GPIO consumer |
| 3533 | * @flags: optional GPIO initialization flags |
| 3534 | * |
| 3535 | * This is equivalent to gpiod_get_array(), except that when no GPIO was |
| 3536 | * assigned to the requested function it will return NULL. |
| 3537 | */ |
| 3538 | struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, |
| 3539 | const char *con_id, |
| 3540 | enum gpiod_flags flags) |
| 3541 | { |
| 3542 | struct gpio_descs *descs; |
| 3543 | |
| 3544 | descs = gpiod_get_array(dev, con_id, flags); |
| 3545 | if (IS_ERR(descs) && (PTR_ERR(descs) == -ENOENT)) |
| 3546 | return NULL; |
| 3547 | |
| 3548 | return descs; |
| 3549 | } |
| 3550 | EXPORT_SYMBOL_GPL(gpiod_get_array_optional); |
| 3551 | |
| 3552 | /** |
Alexandre Courbot | bae48da | 2013-10-17 10:21:38 -0700 | [diff] [blame] | 3553 | * gpiod_put - dispose of a GPIO descriptor |
| 3554 | * @desc: GPIO descriptor to dispose of |
| 3555 | * |
| 3556 | * No descriptor can be used after gpiod_put() has been called on it. |
| 3557 | */ |
| 3558 | void gpiod_put(struct gpio_desc *desc) |
| 3559 | { |
| 3560 | gpiod_free(desc); |
| 3561 | } |
| 3562 | EXPORT_SYMBOL_GPL(gpiod_put); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3563 | |
Rojhalat Ibrahim | 6685852 | 2015-02-11 17:27:58 +0100 | [diff] [blame] | 3564 | /** |
| 3565 | * gpiod_put_array - dispose of multiple GPIO descriptors |
| 3566 | * @descs: struct gpio_descs containing an array of descriptors |
| 3567 | */ |
| 3568 | void gpiod_put_array(struct gpio_descs *descs) |
| 3569 | { |
| 3570 | unsigned int i; |
| 3571 | |
| 3572 | for (i = 0; i < descs->ndescs; i++) |
| 3573 | gpiod_put(descs->desc[i]); |
| 3574 | |
| 3575 | kfree(descs); |
| 3576 | } |
| 3577 | EXPORT_SYMBOL_GPL(gpiod_put_array); |
| 3578 | |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 3579 | static int __init gpiolib_dev_init(void) |
| 3580 | { |
| 3581 | int ret; |
| 3582 | |
| 3583 | /* Register GPIO sysfs bus */ |
| 3584 | ret = bus_register(&gpio_bus_type); |
| 3585 | if (ret < 0) { |
| 3586 | pr_err("gpiolib: could not register GPIO bus type\n"); |
| 3587 | return ret; |
| 3588 | } |
| 3589 | |
| 3590 | ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, "gpiochip"); |
| 3591 | if (ret < 0) { |
| 3592 | pr_err("gpiolib: failed to allocate char dev region\n"); |
| 3593 | bus_unregister(&gpio_bus_type); |
Guenter Roeck | 159f3cd | 2016-03-31 08:11:30 -0700 | [diff] [blame] | 3594 | } else { |
| 3595 | gpiolib_initialized = true; |
| 3596 | gpiochip_setup_devs(); |
Linus Walleij | 3c702e9 | 2015-10-21 15:29:53 +0200 | [diff] [blame] | 3597 | } |
| 3598 | return ret; |
| 3599 | } |
| 3600 | core_initcall(gpiolib_dev_init); |
| 3601 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3602 | #ifdef CONFIG_DEBUG_FS |
| 3603 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 3604 | static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3605 | { |
| 3606 | unsigned i; |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 3607 | struct gpio_chip *chip = gdev->chip; |
| 3608 | unsigned gpio = gdev->base; |
| 3609 | struct gpio_desc *gdesc = &gdev->descs[0]; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3610 | int is_out; |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 3611 | int is_irq; |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3612 | |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 3613 | for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
Markus Pargmann | ced433e | 2015-08-14 16:11:02 +0200 | [diff] [blame] | 3614 | if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
| 3615 | if (gdesc->name) { |
| 3616 | seq_printf(s, " gpio-%-3d (%-20.20s)\n", |
| 3617 | gpio, gdesc->name); |
| 3618 | } |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3619 | continue; |
Markus Pargmann | ced433e | 2015-08-14 16:11:02 +0200 | [diff] [blame] | 3620 | } |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3621 | |
Alexandre Courbot | 372e722 | 2013-02-03 01:29:29 +0900 | [diff] [blame] | 3622 | gpiod_get_direction(gdesc); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3623 | is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 3624 | is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
Markus Pargmann | ced433e | 2015-08-14 16:11:02 +0200 | [diff] [blame] | 3625 | seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s", |
| 3626 | gpio, gdesc->name ? gdesc->name : "", gdesc->label, |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3627 | is_out ? "out" : "in ", |
| 3628 | chip->get |
| 3629 | ? (chip->get(chip, i) ? "hi" : "lo") |
Linus Walleij | d468bf9 | 2013-09-24 11:54:38 +0200 | [diff] [blame] | 3630 | : "? ", |
| 3631 | is_irq ? "IRQ" : " "); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3632 | seq_printf(s, "\n"); |
| 3633 | } |
| 3634 | } |
| 3635 | |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3636 | static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3637 | { |
Grant Likely | 362432a | 2013-02-09 09:41:49 +0000 | [diff] [blame] | 3638 | unsigned long flags; |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 3639 | struct gpio_device *gdev = NULL; |
Alexandre Courbot | cb1650d | 2013-02-03 01:29:27 +0900 | [diff] [blame] | 3640 | loff_t index = *pos; |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3641 | |
| 3642 | s->private = ""; |
| 3643 | |
Grant Likely | 362432a | 2013-02-09 09:41:49 +0000 | [diff] [blame] | 3644 | spin_lock_irqsave(&gpio_lock, flags); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 3645 | list_for_each_entry(gdev, &gpio_devices, list) |
Grant Likely | 362432a | 2013-02-09 09:41:49 +0000 | [diff] [blame] | 3646 | if (index-- == 0) { |
| 3647 | spin_unlock_irqrestore(&gpio_lock, flags); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 3648 | return gdev; |
Grant Likely | 362432a | 2013-02-09 09:41:49 +0000 | [diff] [blame] | 3649 | } |
| 3650 | spin_unlock_irqrestore(&gpio_lock, flags); |
Alexandre Courbot | cb1650d | 2013-02-03 01:29:27 +0900 | [diff] [blame] | 3651 | |
| 3652 | return NULL; |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3653 | } |
| 3654 | |
| 3655 | static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| 3656 | { |
Grant Likely | 362432a | 2013-02-09 09:41:49 +0000 | [diff] [blame] | 3657 | unsigned long flags; |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 3658 | struct gpio_device *gdev = v; |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3659 | void *ret = NULL; |
| 3660 | |
Grant Likely | 362432a | 2013-02-09 09:41:49 +0000 | [diff] [blame] | 3661 | spin_lock_irqsave(&gpio_lock, flags); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 3662 | if (list_is_last(&gdev->list, &gpio_devices)) |
Alexandre Courbot | cb1650d | 2013-02-03 01:29:27 +0900 | [diff] [blame] | 3663 | ret = NULL; |
| 3664 | else |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 3665 | ret = list_entry(gdev->list.next, struct gpio_device, list); |
Grant Likely | 362432a | 2013-02-09 09:41:49 +0000 | [diff] [blame] | 3666 | spin_unlock_irqrestore(&gpio_lock, flags); |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3667 | |
| 3668 | s->private = "\n"; |
| 3669 | ++*pos; |
| 3670 | |
| 3671 | return ret; |
| 3672 | } |
| 3673 | |
| 3674 | static void gpiolib_seq_stop(struct seq_file *s, void *v) |
| 3675 | { |
| 3676 | } |
| 3677 | |
| 3678 | static int gpiolib_seq_show(struct seq_file *s, void *v) |
| 3679 | { |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 3680 | struct gpio_device *gdev = v; |
| 3681 | struct gpio_chip *chip = gdev->chip; |
| 3682 | struct device *parent; |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3683 | |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 3684 | if (!chip) { |
| 3685 | seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, |
| 3686 | dev_name(&gdev->dev)); |
| 3687 | return 0; |
| 3688 | } |
| 3689 | |
| 3690 | seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
| 3691 | dev_name(&gdev->dev), |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 3692 | gdev->base, gdev->base + gdev->ngpio - 1); |
Linus Walleij | ff2b135 | 2015-10-20 11:10:38 +0200 | [diff] [blame] | 3693 | parent = chip->parent; |
| 3694 | if (parent) |
| 3695 | seq_printf(s, ", parent: %s/%s", |
| 3696 | parent->bus ? parent->bus->name : "no-bus", |
| 3697 | dev_name(parent)); |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3698 | if (chip->label) |
| 3699 | seq_printf(s, ", %s", chip->label); |
| 3700 | if (chip->can_sleep) |
| 3701 | seq_printf(s, ", can sleep"); |
| 3702 | seq_printf(s, ":\n"); |
| 3703 | |
| 3704 | if (chip->dbg_show) |
| 3705 | chip->dbg_show(s, chip); |
| 3706 | else |
Linus Walleij | fdeb8e1 | 2016-02-10 10:57:36 +0100 | [diff] [blame] | 3707 | gpiolib_dbg_show(s, gdev); |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3708 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3709 | return 0; |
| 3710 | } |
| 3711 | |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3712 | static const struct seq_operations gpiolib_seq_ops = { |
| 3713 | .start = gpiolib_seq_start, |
| 3714 | .next = gpiolib_seq_next, |
| 3715 | .stop = gpiolib_seq_stop, |
| 3716 | .show = gpiolib_seq_show, |
| 3717 | }; |
| 3718 | |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3719 | static int gpiolib_open(struct inode *inode, struct file *file) |
| 3720 | { |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3721 | return seq_open(file, &gpiolib_seq_ops); |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3722 | } |
| 3723 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 3724 | static const struct file_operations gpiolib_operations = { |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3725 | .owner = THIS_MODULE, |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3726 | .open = gpiolib_open, |
| 3727 | .read = seq_read, |
| 3728 | .llseek = seq_lseek, |
Thierry Reding | f9c4a31 | 2012-04-12 13:26:01 +0200 | [diff] [blame] | 3729 | .release = seq_release, |
David Brownell | d2876d0 | 2008-02-04 22:28:20 -0800 | [diff] [blame] | 3730 | }; |
| 3731 | |
| 3732 | static int __init gpiolib_debugfs_init(void) |
| 3733 | { |
| 3734 | /* /sys/kernel/debug/gpio */ |
| 3735 | (void) debugfs_create_file("gpio", S_IFREG | S_IRUGO, |
| 3736 | NULL, NULL, &gpiolib_operations); |
| 3737 | return 0; |
| 3738 | } |
| 3739 | subsys_initcall(gpiolib_debugfs_init); |
| 3740 | |
| 3741 | #endif /* DEBUG_FS */ |