blob: 1d1fa7248d63e52fe1050596e1df615f007f96c5 [file] [log] [blame]
Andy Shevchenko5e4e6fb2017-01-03 19:01:17 +02001#include <linux/bitops.h>
David Brownelld2876d02008-02-04 22:28:20 -08002#include <linux/kernel.h>
3#include <linux/module.h>
Daniel Glöcknerff77c352009-09-22 16:46:38 -07004#include <linux/interrupt.h>
David Brownelld2876d02008-02-04 22:28:20 -08005#include <linux/irq.h>
6#include <linux/spinlock.h>
Alexandre Courbot1a989d02013-02-03 01:29:24 +09007#include <linux/list.h>
David Brownelld8f388d82008-07-25 01:46:07 -07008#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 Vorontsov391c9702010-06-08 07:48:17 -060013#include <linux/of_gpio.h>
Daniel Glöcknerff77c352009-09-22 16:46:38 -070014#include <linux/idr.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Rafael J. Wysocki7b199812013-11-11 22:41:56 +010016#include <linux/acpi.h>
Alexandre Courbot53e7cac2013-11-16 21:44:52 +090017#include <linux/gpio/driver.h>
Linus Walleij0a6d3152014-07-24 20:08:55 +020018#include <linux/gpio/machine.h>
Jonas Gorskic771c2f2015-10-11 17:34:15 +020019#include <linux/pinctrl/consumer.h>
Linus Walleij3c702e92015-10-21 15:29:53 +020020#include <linux/cdev.h>
21#include <linux/fs.h>
22#include <linux/uaccess.h>
Linus Walleij8b92e172016-05-27 14:24:04 +020023#include <linux/compat.h>
Linus Walleijd7c51b42016-04-26 10:35:29 +020024#include <linux/anon_inodes.h>
Lars-Peter Clausen953b9562016-10-24 13:59:15 +020025#include <linux/file.h>
Linus Walleij61f922d2016-06-02 11:30:15 +020026#include <linux/kfifo.h>
27#include <linux/poll.h>
28#include <linux/timekeeping.h>
Linus Walleij3c702e92015-10-21 15:29:53 +020029#include <uapi/linux/gpio.h>
David Brownelld2876d02008-02-04 22:28:20 -080030
Mika Westerberg664e3e52014-01-08 12:40:54 +020031#include "gpiolib.h"
32
Uwe Kleine-König3f397c212011-05-20 00:40:19 -060033#define CREATE_TRACE_POINTS
34#include <trace/events/gpio.h>
David Brownelld2876d02008-02-04 22:28:20 -080035
Alexandre Courbot79a9bec2013-10-17 10:21:36 -070036/* Implementation infrastructure for GPIO interfaces.
David Brownelld2876d02008-02-04 22:28:20 -080037 *
Alexandre Courbot79a9bec2013-10-17 10:21:36 -070038 * 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 Brownelld2876d02008-02-04 22:28:20 -080041 */
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 Walleijff2b1352015-10-20 11:10:38 +020056/* Device and char device-related information */
57static DEFINE_IDA(gpio_ida);
Linus Walleij3c702e92015-10-21 15:29:53 +020058static dev_t gpio_devt;
59#define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */
60static struct bus_type gpio_bus_type = {
61 .name = "gpio",
62};
Linus Walleijff2b1352015-10-20 11:10:38 +020063
David Brownelld2876d02008-02-04 22:28:20 -080064/* 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 Courbot0eb4c6c2014-07-01 14:45:15 +090068DEFINE_SPINLOCK(gpio_lock);
David Brownelld2876d02008-02-04 22:28:20 -080069
Alexandre Courbotbae48da2013-10-17 10:21:38 -070070static DEFINE_MUTEX(gpio_lookup_lock);
71static LIST_HEAD(gpio_lookup_list);
Linus Walleijff2b1352015-10-20 11:10:38 +020072LIST_HEAD(gpio_devices);
Johan Hovold6d867502015-05-04 17:23:25 +020073
74static void gpiochip_free_hogs(struct gpio_chip *chip);
75static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip);
Mika Westerberg79b804c2016-09-20 15:15:21 +030076static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip);
77static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip);
Johan Hovold6d867502015-05-04 17:23:25 +020078
Guenter Roeck159f3cd2016-03-31 08:11:30 -070079static bool gpiolib_initialized;
Johan Hovold6d867502015-05-04 17:23:25 +020080
David Brownelld2876d02008-02-04 22:28:20 -080081static inline void desc_set_label(struct gpio_desc *d, const char *label)
82{
David Brownelld2876d02008-02-04 22:28:20 -080083 d->label = label;
David Brownelld2876d02008-02-04 22:28:20 -080084}
85
Alexandre Courbot372e7222013-02-03 01:29:29 +090086/**
87 * Convert a GPIO number to its descriptor
88 */
Alexandre Courbot79a9bec2013-10-17 10:21:36 -070089struct gpio_desc *gpio_to_desc(unsigned gpio)
Alexandre Courbot372e7222013-02-03 01:29:29 +090090{
Linus Walleijff2b1352015-10-20 11:10:38 +020091 struct gpio_device *gdev;
Alexandre Courbot14e85c02014-11-19 16:51:27 +090092 unsigned long flags;
93
94 spin_lock_irqsave(&gpio_lock, flags);
95
Linus Walleijff2b1352015-10-20 11:10:38 +020096 list_for_each_entry(gdev, &gpio_devices, list) {
Linus Walleijfdeb8e12016-02-10 10:57:36 +010097 if (gdev->base <= gpio &&
98 gdev->base + gdev->ngpio > gpio) {
Alexandre Courbot14e85c02014-11-19 16:51:27 +090099 spin_unlock_irqrestore(&gpio_lock, flags);
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100100 return &gdev->descs[gpio - gdev->base];
Alexandre Courbot14e85c02014-11-19 16:51:27 +0900101 }
102 }
103
104 spin_unlock_irqrestore(&gpio_lock, flags);
105
Alexandre Courbot0e9a5ed2014-12-02 23:15:05 +0900106 if (!gpio_is_valid(gpio))
107 WARN(1, "invalid GPIO %d\n", gpio);
108
Alexandre Courbot14e85c02014-11-19 16:51:27 +0900109 return NULL;
Alexandre Courbot372e7222013-02-03 01:29:29 +0900110}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -0700111EXPORT_SYMBOL_GPL(gpio_to_desc);
Alexandre Courbot372e7222013-02-03 01:29:29 +0900112
113/**
Alexandre Courbotbb1e88c2014-02-09 17:43:54 +0900114 * Get the GPIO descriptor corresponding to the given hw number for this chip.
Linus Walleijd468bf92013-09-24 11:54:38 +0200115 */
Alexandre Courbotbb1e88c2014-02-09 17:43:54 +0900116struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip,
117 u16 hwnum)
Linus Walleijd468bf92013-09-24 11:54:38 +0200118{
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100119 struct gpio_device *gdev = chip->gpiodev;
120
121 if (hwnum >= gdev->ngpio)
Alexandre Courbotb7d0a282013-12-03 12:31:11 +0900122 return ERR_PTR(-EINVAL);
Linus Walleijd468bf92013-09-24 11:54:38 +0200123
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100124 return &gdev->descs[hwnum];
Linus Walleijd468bf92013-09-24 11:54:38 +0200125}
Alexandre Courbot372e7222013-02-03 01:29:29 +0900126
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 Courbot79a9bec2013-10-17 10:21:36 -0700132int desc_to_gpio(const struct gpio_desc *desc)
Alexandre Courbot372e7222013-02-03 01:29:29 +0900133{
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100134 return desc->gdev->base + (desc - &desc->gdev->descs[0]);
Alexandre Courbot372e7222013-02-03 01:29:29 +0900135}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -0700136EXPORT_SYMBOL_GPL(desc_to_gpio);
Alexandre Courbot372e7222013-02-03 01:29:29 +0900137
138
Alexandre Courbot79a9bec2013-10-17 10:21:36 -0700139/**
140 * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs
141 * @desc: descriptor to return the chip of
142 */
143struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
Alexandre Courbot372e7222013-02-03 01:29:29 +0900144{
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100145 if (!desc || !desc->gdev || !desc->gdev->chip)
146 return NULL;
147 return desc->gdev->chip;
Alexandre Courbot372e7222013-02-03 01:29:29 +0900148}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -0700149EXPORT_SYMBOL_GPL(gpiod_to_chip);
David Brownelld2876d02008-02-04 22:28:20 -0800150
Anton Vorontsov8d0aab22008-04-28 02:14:46 -0700151/* dynamic allocation of GPIOs, e.g. on a hotplugged device */
152static int gpiochip_find_base(int ngpio)
153{
Linus Walleijff2b1352015-10-20 11:10:38 +0200154 struct gpio_device *gdev;
Alexandre Courbot83cabe32013-02-03 01:29:28 +0900155 int base = ARCH_NR_GPIOS - ngpio;
Anton Vorontsov8d0aab22008-04-28 02:14:46 -0700156
Linus Walleijff2b1352015-10-20 11:10:38 +0200157 list_for_each_entry_reverse(gdev, &gpio_devices, list) {
Alexandre Courbot83cabe32013-02-03 01:29:28 +0900158 /* found a free space? */
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100159 if (gdev->base + gdev->ngpio <= base)
Alexandre Courbot83cabe32013-02-03 01:29:28 +0900160 break;
161 else
162 /* nope, check the space right before the chip */
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100163 base = gdev->base - ngpio;
Anton Vorontsov8d0aab22008-04-28 02:14:46 -0700164 }
165
Alexandre Courbot83cabe32013-02-03 01:29:28 +0900166 if (gpio_is_valid(base)) {
Anton Vorontsov8d0aab22008-04-28 02:14:46 -0700167 pr_debug("%s: found new base at %d\n", __func__, base);
Alexandre Courbot83cabe32013-02-03 01:29:28 +0900168 return base;
169 } else {
170 pr_err("%s: cannot find free range\n", __func__);
171 return -ENOSPC;
Anton Vorontsov169b6a72008-04-28 02:14:47 -0700172 }
Anton Vorontsov169b6a72008-04-28 02:14:47 -0700173}
174
Alexandre Courbot79a9bec2013-10-17 10:21:36 -0700175/**
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 Courbot8e53b0f2014-11-25 17:16:31 +0900183int gpiod_get_direction(struct gpio_desc *desc)
Mathias Nyman80b0a602012-10-24 17:25:27 +0300184{
185 struct gpio_chip *chip;
Alexandre Courbot372e7222013-02-03 01:29:29 +0900186 unsigned offset;
Mathias Nyman80b0a602012-10-24 17:25:27 +0300187 int status = -EINVAL;
188
Alexandre Courbot372e7222013-02-03 01:29:29 +0900189 chip = gpiod_to_chip(desc);
190 offset = gpio_chip_hwgpio(desc);
Mathias Nyman80b0a602012-10-24 17:25:27 +0300191
192 if (!chip->get_direction)
193 return status;
194
Alexandre Courbot372e7222013-02-03 01:29:29 +0900195 status = chip->get_direction(chip, offset);
Mathias Nyman80b0a602012-10-24 17:25:27 +0300196 if (status > 0) {
197 /* GPIOF_DIR_IN, or other positive */
198 status = 1;
Alexandre Courbot8e53b0f2014-11-25 17:16:31 +0900199 clear_bit(FLAG_IS_OUT, &desc->flags);
Mathias Nyman80b0a602012-10-24 17:25:27 +0300200 }
201 if (status == 0) {
202 /* GPIOF_DIR_OUT */
Alexandre Courbot8e53b0f2014-11-25 17:16:31 +0900203 set_bit(FLAG_IS_OUT, &desc->flags);
Mathias Nyman80b0a602012-10-24 17:25:27 +0300204 }
205 return status;
206}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -0700207EXPORT_SYMBOL_GPL(gpiod_get_direction);
Mathias Nyman80b0a602012-10-24 17:25:27 +0300208
Alexandre Courbot1a989d02013-02-03 01:29:24 +0900209/*
210 * Add a new chip to the global chips list, keeping the list of chips sorted
Bamvor Jian Zhangef7c7552015-11-16 13:02:46 +0800211 * by range(means [base, base + ngpio - 1]) order.
Alexandre Courbot1a989d02013-02-03 01:29:24 +0900212 *
213 * Return -EBUSY if the new chip overlaps with some other chip's integer
214 * space.
215 */
Linus Walleijff2b1352015-10-20 11:10:38 +0200216static int gpiodev_add_to_list(struct gpio_device *gdev)
Alexandre Courbot1a989d02013-02-03 01:29:24 +0900217{
Bamvor Jian Zhanga961f9b2016-02-26 22:37:14 +0800218 struct gpio_device *prev, *next;
Linus Walleijff2b1352015-10-20 11:10:38 +0200219
220 if (list_empty(&gpio_devices)) {
Bamvor Jian Zhanga961f9b2016-02-26 22:37:14 +0800221 /* initial entry in list */
Linus Walleijff2b1352015-10-20 11:10:38 +0200222 list_add_tail(&gdev->list, &gpio_devices);
Sudip Mukherjeee28ecca2015-12-27 19:06:50 +0530223 return 0;
Alexandre Courbot1a989d02013-02-03 01:29:24 +0900224 }
225
Bamvor Jian Zhanga961f9b2016-02-26 22:37:14 +0800226 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 Grossholtz96098df2016-01-07 16:46:45 -0500230 return 0;
231 }
Alexandre Courbot1a989d02013-02-03 01:29:24 +0900232
Bamvor Jian Zhanga961f9b2016-02-26 22:37:14 +0800233 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 Zhangef7c7552015-11-16 13:02:46 +0800239
Bamvor Jian Zhanga961f9b2016-02-26 22:37:14 +0800240 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 Courbot1a989d02013-02-03 01:29:24 +0900255}
256
Linus Walleijf881bab2015-09-23 16:20:43 -0700257/**
258 * Convert a GPIO name to its descriptor
259 */
260static struct gpio_desc *gpio_name_to_desc(const char * const name)
261{
Linus Walleijff2b1352015-10-20 11:10:38 +0200262 struct gpio_device *gdev;
Linus Walleijf881bab2015-09-23 16:20:43 -0700263 unsigned long flags;
264
265 spin_lock_irqsave(&gpio_lock, flags);
266
Linus Walleijff2b1352015-10-20 11:10:38 +0200267 list_for_each_entry(gdev, &gpio_devices, list) {
Linus Walleijf881bab2015-09-23 16:20:43 -0700268 int i;
269
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100270 for (i = 0; i != gdev->ngpio; ++i) {
271 struct gpio_desc *desc = &gdev->descs[i];
Linus Walleijf881bab2015-09-23 16:20:43 -0700272
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100273 if (!desc->name || !name)
Linus Walleijf881bab2015-09-23 16:20:43 -0700274 continue;
275
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100276 if (!strcmp(desc->name, name)) {
Linus Walleijf881bab2015-09-23 16:20:43 -0700277 spin_unlock_irqrestore(&gpio_lock, flags);
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100278 return desc;
Linus Walleijf881bab2015-09-23 16:20:43 -0700279 }
280 }
281 }
282
283 spin_unlock_irqrestore(&gpio_lock, flags);
284
285 return NULL;
286}
287
Markus Pargmann5f3ca732015-08-14 16:11:00 +0200288/*
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 Zhanged379152015-11-14 16:43:20 +0800292 * Warning if one of the names is already used for a different GPIO.
Markus Pargmann5f3ca732015-08-14 16:11:00 +0200293 */
294static int gpiochip_set_desc_names(struct gpio_chip *gc)
295{
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100296 struct gpio_device *gdev = gc->gpiodev;
Markus Pargmann5f3ca732015-08-14 16:11:00 +0200297 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 Walleijf881bab2015-09-23 16:20:43 -0700307 if (gpio)
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100308 dev_warn(&gdev->dev,
Linus Walleij34ffd852015-10-20 11:31:54 +0200309 "Detected name collision for GPIO name '%s'\n",
Linus Walleijf881bab2015-09-23 16:20:43 -0700310 gc->names[i]);
Markus Pargmann5f3ca732015-08-14 16:11:00 +0200311 }
312
313 /* Then add all names to the GPIO descriptors */
314 for (i = 0; i != gc->ngpio; ++i)
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100315 gdev->descs[i].name = gc->names[i];
Markus Pargmann5f3ca732015-08-14 16:11:00 +0200316
317 return 0;
318}
319
Linus Walleijd7c51b42016-04-26 10:35:29 +0200320/*
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 */
331struct 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 Clausene3e847c2016-10-18 16:54:05 +0200338#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 Walleijd7c51b42016-04-26 10:35:29 +0200345static 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 Clausen3eded5d2016-10-18 16:54:02 +0200356 memset(&ghd, 0, sizeof(ghd));
357
Linus Walleijd7c51b42016-04-26 10:35:29 +0200358 /* 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
393static 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
400static 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
414static 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
424static int linehandle_create(struct gpio_device *gdev, void __user *ip)
425{
426 struct gpiohandle_request handlereq;
427 struct linehandle_state *lh;
Lars-Peter Clausen953b9562016-10-24 13:59:15 +0200428 struct file *file;
Linus Walleijd7c51b42016-04-26 10:35:29 +0200429 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 Clausene405f9f2016-10-18 16:54:01 +0200459 if (offset >= gdev->ngpio) {
460 ret = -EINVAL;
461 goto out_free_descs;
462 }
463
Lars-Peter Clausene3e847c2016-10-18 16:54:05 +0200464 /* 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 Walleijd7c51b42016-04-26 10:35:29 +0200470 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 Walleije2f608b2016-06-18 10:56:43 +0200501 /* Let i point at the last handle */
502 i--;
Linus Walleijd7c51b42016-04-26 10:35:29 +0200503 lh->numdescs = handlereq.lines;
504
Lars-Peter Clausen953b9562016-10-24 13:59:15 +0200505 fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
Linus Walleijd7c51b42016-04-26 10:35:29 +0200506 if (fd < 0) {
507 ret = fd;
508 goto out_free_descs;
509 }
510
Lars-Peter Clausen953b9562016-10-24 13:59:15 +0200511 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 Walleijd7c51b42016-04-26 10:35:29 +0200520 handlereq.fd = fd;
Linus Walleijd932cd42016-07-04 13:13:04 +0200521 if (copy_to_user(ip, &handlereq, sizeof(handlereq))) {
Lars-Peter Clausen953b9562016-10-24 13:59:15 +0200522 /*
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 Walleijd932cd42016-07-04 13:13:04 +0200529 }
Linus Walleijd7c51b42016-04-26 10:35:29 +0200530
Lars-Peter Clausen953b9562016-10-24 13:59:15 +0200531 fd_install(fd, file);
532
Linus Walleijd7c51b42016-04-26 10:35:29 +0200533 dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n",
534 lh->numdescs);
535
536 return 0;
537
Lars-Peter Clausen953b9562016-10-24 13:59:15 +0200538out_put_unused_fd:
539 put_unused_fd(fd);
Linus Walleijd7c51b42016-04-26 10:35:29 +0200540out_free_descs:
541 for (; i >= 0; i--)
542 gpiod_free(lh->descs[i]);
543 kfree(lh->label);
544out_free_lh:
545 kfree(lh);
546 put_device(&gdev->dev);
547 return ret;
548}
549
Linus Walleij61f922d2016-06-02 11:30:15 +0200550/*
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 */
566struct 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 Clausenac7dbb92016-10-18 16:54:06 +0200577#define GPIOEVENT_REQUEST_VALID_FLAGS \
578 (GPIOEVENT_REQUEST_RISING_EDGE | \
579 GPIOEVENT_REQUEST_FALLING_EDGE)
580
Linus Walleij61f922d2016-06-02 11:30:15 +0200581static 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
596static 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
641static 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
654static 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 Clausend82aa4a2016-10-18 16:54:04 +0200668 memset(&ghd, 0, sizeof(ghd));
669
Linus Walleij61f922d2016-06-02 11:30:15 +0200670 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
684static 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
691static 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 Dooks33265b12016-06-17 16:03:13 +0100703static irqreturn_t lineevent_irq_thread(int irq, void *p)
Linus Walleij61f922d2016-06-02 11:30:15 +0200704{
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 Bergmannbc0207a2016-06-16 11:02:41 +0200726 } else {
727 return IRQ_NONE;
Linus Walleij61f922d2016-06-02 11:30:15 +0200728 }
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
737static 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 Clausen953b9562016-10-24 13:59:15 +0200742 struct file *file;
Linus Walleij61f922d2016-06-02 11:30:15 +0200743 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 Clausenb8b0e3d2016-10-18 16:54:03 +0200774 if (offset >= gdev->ngpio) {
775 ret = -EINVAL;
776 goto out_free_label;
777 }
778
Lars-Peter Clausenac7dbb92016-10-18 16:54:06 +0200779 /* 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 Walleij61f922d2016-06-02 11:30:15 +0200786 /* 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 Clausen953b9562016-10-24 13:59:15 +0200837 fd = get_unused_fd_flags(O_RDONLY | O_CLOEXEC);
Linus Walleij61f922d2016-06-02 11:30:15 +0200838 if (fd < 0) {
839 ret = fd;
840 goto out_free_irq;
841 }
842
Lars-Peter Clausen953b9562016-10-24 13:59:15 +0200843 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 Walleij61f922d2016-06-02 11:30:15 +0200852 eventreq.fd = fd;
Linus Walleijd932cd42016-07-04 13:13:04 +0200853 if (copy_to_user(ip, &eventreq, sizeof(eventreq))) {
Lars-Peter Clausen953b9562016-10-24 13:59:15 +0200854 /*
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 Walleijd932cd42016-07-04 13:13:04 +0200861 }
Linus Walleij61f922d2016-06-02 11:30:15 +0200862
Lars-Peter Clausen953b9562016-10-24 13:59:15 +0200863 fd_install(fd, file);
864
Linus Walleij61f922d2016-06-02 11:30:15 +0200865 return 0;
866
Lars-Peter Clausen953b9562016-10-24 13:59:15 +0200867out_put_unused_fd:
868 put_unused_fd(fd);
Linus Walleij61f922d2016-06-02 11:30:15 +0200869out_free_irq:
870 free_irq(le->irq, le);
871out_free_desc:
872 gpiod_free(le->desc);
873out_free_label:
874 kfree(le->label);
875out_free_le:
876 kfree(le);
877 put_device(&gdev->dev);
878 return ret;
879}
880
Linus Walleij3c702e92015-10-21 15:29:53 +0200881/**
882 * gpio_ioctl() - ioctl handler for the GPIO chardev
883 */
884static 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 Walleij8b92e172016-05-27 14:24:04 +0200888 void __user *ip = (void __user *)arg;
Linus Walleij3c702e92015-10-21 15:29:53 +0200889
890 /* We fail any subsequent ioctl():s when the chip is gone */
891 if (!chip)
892 return -ENODEV;
893
Linus Walleij521a2ad2016-02-12 22:25:22 +0100894 /* Fill in the struct and pass to userspace */
Linus Walleij3c702e92015-10-21 15:29:53 +0200895 if (cmd == GPIO_GET_CHIPINFO_IOCTL) {
Linus Walleij521a2ad2016-02-12 22:25:22 +0100896 struct gpiochip_info chipinfo;
897
Lars-Peter Clausen0f4bbb22016-10-18 16:54:00 +0200898 memset(&chipinfo, 0, sizeof(chipinfo));
899
Linus Walleij3c702e92015-10-21 15:29:53 +0200900 strncpy(chipinfo.name, dev_name(&gdev->dev),
901 sizeof(chipinfo.name));
902 chipinfo.name[sizeof(chipinfo.name)-1] = '\0';
Linus Walleijdf4878e2016-02-12 14:48:23 +0100903 strncpy(chipinfo.label, gdev->label,
904 sizeof(chipinfo.label));
905 chipinfo.label[sizeof(chipinfo.label)-1] = '\0';
Linus Walleijfdeb8e12016-02-10 10:57:36 +0100906 chipinfo.lines = gdev->ngpio;
Linus Walleij3c702e92015-10-21 15:29:53 +0200907 if (copy_to_user(ip, &chipinfo, sizeof(chipinfo)))
908 return -EFAULT;
909 return 0;
Linus Walleij521a2ad2016-02-12 22:25:22 +0100910 } 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 Clausen1f1cc452016-10-18 16:53:59 +0200916 if (lineinfo.line_offset >= gdev->ngpio)
Linus Walleij521a2ad2016-02-12 22:25:22 +0100917 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 Walleij214338e2016-02-25 21:01:48 +0100928 strncpy(lineinfo.consumer, desc->label,
929 sizeof(lineinfo.consumer));
930 lineinfo.consumer[sizeof(lineinfo.consumer)-1] = '\0';
Linus Walleij521a2ad2016-02-12 22:25:22 +0100931 } else {
Linus Walleij214338e2016-02-25 21:01:48 +0100932 lineinfo.consumer[0] = '\0';
Linus Walleij521a2ad2016-02-12 22:25:22 +0100933 }
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 Walleij9d8cc892016-02-22 13:44:53 +0100940 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 Walleij521a2ad2016-02-12 22:25:22 +0100945 lineinfo.flags |= GPIOLINE_FLAG_KERNEL;
Linus Walleij9d8cc892016-02-22 13:44:53 +0100946 if (test_bit(FLAG_IS_OUT, &desc->flags))
Linus Walleij521a2ad2016-02-12 22:25:22 +0100947 lineinfo.flags |= GPIOLINE_FLAG_IS_OUT;
Linus Walleij9d8cc892016-02-22 13:44:53 +0100948 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
Linus Walleij521a2ad2016-02-12 22:25:22 +0100949 lineinfo.flags |= GPIOLINE_FLAG_ACTIVE_LOW;
Linus Walleij9d8cc892016-02-22 13:44:53 +0100950 if (test_bit(FLAG_OPEN_DRAIN, &desc->flags))
Linus Walleij521a2ad2016-02-12 22:25:22 +0100951 lineinfo.flags |= GPIOLINE_FLAG_OPEN_DRAIN;
Linus Walleij9d8cc892016-02-22 13:44:53 +0100952 if (test_bit(FLAG_OPEN_SOURCE, &desc->flags))
Linus Walleij521a2ad2016-02-12 22:25:22 +0100953 lineinfo.flags |= GPIOLINE_FLAG_OPEN_SOURCE;
954
955 if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))
956 return -EFAULT;
957 return 0;
Linus Walleijd7c51b42016-04-26 10:35:29 +0200958 } else if (cmd == GPIO_GET_LINEHANDLE_IOCTL) {
959 return linehandle_create(gdev, ip);
Linus Walleij61f922d2016-06-02 11:30:15 +0200960 } else if (cmd == GPIO_GET_LINEEVENT_IOCTL) {
961 return lineevent_create(gdev, ip);
Linus Walleij3c702e92015-10-21 15:29:53 +0200962 }
963 return -EINVAL;
964}
965
Linus Walleij8b92e172016-05-27 14:24:04 +0200966#ifdef CONFIG_COMPAT
967static 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 Walleij3c702e92015-10-21 15:29:53 +0200974/**
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 */
980static 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 Boydfb505742017-01-09 11:47:44 -0800986 if (!gdev->chip)
Linus Walleij3c702e92015-10-21 15:29:53 +0200987 return -ENODEV;
988 get_device(&gdev->dev);
989 filp->private_data = gdev;
Lars-Peter Clausenf4e81c52016-11-30 13:05:21 +0100990
991 return nonseekable_open(inode, filp);
Linus Walleij3c702e92015-10-21 15:29:53 +0200992}
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 */
1000static 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 Walleij3c702e92015-10-21 15:29:53 +02001005 put_device(&gdev->dev);
1006 return 0;
1007}
1008
1009
1010static const struct file_operations gpio_fileops = {
1011 .release = gpio_chrdev_release,
1012 .open = gpio_chrdev_open,
1013 .owner = THIS_MODULE,
Lars-Peter Clausenf4e81c52016-11-30 13:05:21 +01001014 .llseek = no_llseek,
Linus Walleij3c702e92015-10-21 15:29:53 +02001015 .unlocked_ioctl = gpio_ioctl,
Linus Walleij8b92e172016-05-27 14:24:04 +02001016#ifdef CONFIG_COMPAT
1017 .compat_ioctl = gpio_ioctl_compat,
1018#endif
Linus Walleij3c702e92015-10-21 15:29:53 +02001019};
1020
Linus Walleijff2b1352015-10-20 11:10:38 +02001021static 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 Roeck476e2fc2016-03-31 08:11:29 -07001027 kfree(gdev->label);
1028 kfree(gdev->descs);
Linus Walleij9efd9e62016-02-09 14:27:42 +01001029 kfree(gdev);
Linus Walleijff2b1352015-10-20 11:10:38 +02001030}
1031
Guenter Roeck159f3cd2016-03-31 08:11:30 -07001032static 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 Roeck159f3cd2016-03-31 08:11:30 -07001057 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
1063err_remove_device:
1064 device_del(&gdev->dev);
1065err_remove_chardev:
1066 cdev_del(&gdev->chrdev);
1067 return status;
1068}
1069
1070static 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 Vorontsov169b6a72008-04-28 02:14:47 -07001083/**
Linus Walleijb08ea352015-12-03 15:14:13 +01001084 * gpiochip_add_data() - register a gpio_chip
David Brownelld2876d02008-02-04 22:28:20 -08001085 * @chip: the chip to register, with chip->base initialized
Alexandre Courbot14e85c02014-11-19 16:51:27 +09001086 * Context: potentially before irqs will work
David Brownelld2876d02008-02-04 22:28:20 -08001087 *
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 Vorontsov8d0aab22008-04-28 02:14:46 -07001091 *
Linus Walleijb08ea352015-12-03 15:14:13 +01001092 * When gpiochip_add_data() is called very early during boot, so that GPIOs
Bamvor Jian Zhangc88402c2015-11-18 17:07:07 +08001093 * can be freely used, the chip->parent device must be registered before
David Brownelld8f388d82008-07-25 01:46:07 -07001094 * the gpio framework's arch_initcall(). Otherwise sysfs initialization
1095 * for GPIOs will fail rudely.
1096 *
Guenter Roeck159f3cd2016-03-31 08:11:30 -07001097 * gpiochip_add_data() must only be called after gpiolib initialization,
1098 * ie after core_initcall().
1099 *
Anton Vorontsov8d0aab22008-04-28 02:14:46 -07001100 * If chip->base is negative, this requests dynamic assignment of
1101 * a range of valid GPIOs.
David Brownelld2876d02008-02-04 22:28:20 -08001102 */
Linus Walleijb08ea352015-12-03 15:14:13 +01001103int gpiochip_add_data(struct gpio_chip *chip, void *data)
David Brownelld2876d02008-02-04 22:28:20 -08001104{
1105 unsigned long flags;
1106 int status = 0;
Linus Walleijff2b1352015-10-20 11:10:38 +02001107 unsigned i;
Anton Vorontsov8d0aab22008-04-28 02:14:46 -07001108 int base = chip->base;
Linus Walleijff2b1352015-10-20 11:10:38 +02001109 struct gpio_device *gdev;
David Brownelld2876d02008-02-04 22:28:20 -08001110
Linus Walleijff2b1352015-10-20 11:10:38 +02001111 /*
1112 * First: allocate and populate the internal stat container, and
1113 * set up the struct device.
1114 */
Josh Cartwright969f07b2016-02-17 16:44:15 -06001115 gdev = kzalloc(sizeof(*gdev), GFP_KERNEL);
Linus Walleijff2b1352015-10-20 11:10:38 +02001116 if (!gdev)
Alexandre Courbot14e85c02014-11-19 16:51:27 +09001117 return -ENOMEM;
Linus Walleij3c702e92015-10-21 15:29:53 +02001118 gdev->dev.bus = &gpio_bus_type;
Linus Walleijff2b1352015-10-20 11:10:38 +02001119 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 Redingacc6e332016-07-05 14:11:14 +02001124 }
1125
Linus Walleijff2b1352015-10-20 11:10:38 +02001126#ifdef CONFIG_OF_GPIO
1127 /* If the gpiochip has an assigned OF node this takes precedence */
Thierry Redingacc6e332016-07-05 14:11:14 +02001128 if (chip->of_node)
1129 gdev->dev.of_node = chip->of_node;
Linus Walleijff2b1352015-10-20 11:10:38 +02001130#endif
Thierry Redingacc6e332016-07-05 14:11:14 +02001131
Linus Walleijff2b1352015-10-20 11:10:38 +02001132 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 Brownelld2876d02008-02-04 22:28:20 -08001147
Guenter Roeck476e2fc2016-03-31 08:11:29 -07001148 gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL);
Linus Walleij1c3cdb12016-02-09 13:51:59 +01001149 if (!gdev->descs) {
Linus Walleijff2b1352015-10-20 11:10:38 +02001150 status = -ENOMEM;
1151 goto err_free_gdev;
1152 }
1153
Bamvor Jian Zhang5ed41cc2015-11-16 13:02:47 +08001154 if (chip->ngpio == 0) {
1155 chip_err(chip, "tried to insert a GPIO chip with zero lines\n");
Linus Walleijff2b1352015-10-20 11:10:38 +02001156 status = -EINVAL;
Guenter Roeck159f3cd2016-03-31 08:11:30 -07001157 goto err_free_descs;
Bamvor Jian Zhang5ed41cc2015-11-16 13:02:47 +08001158 }
Linus Walleijdf4878e2016-02-12 14:48:23 +01001159
1160 if (chip->label)
Guenter Roeck476e2fc2016-03-31 08:11:29 -07001161 gdev->label = kstrdup(chip->label, GFP_KERNEL);
Linus Walleijdf4878e2016-02-12 14:48:23 +01001162 else
Guenter Roeck476e2fc2016-03-31 08:11:29 -07001163 gdev->label = kstrdup("unknown", GFP_KERNEL);
Linus Walleijdf4878e2016-02-12 14:48:23 +01001164 if (!gdev->label) {
1165 status = -ENOMEM;
Guenter Roeck476e2fc2016-03-31 08:11:29 -07001166 goto err_free_descs;
Linus Walleijdf4878e2016-02-12 14:48:23 +01001167 }
1168
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001169 gdev->ngpio = chip->ngpio;
Linus Walleij43c54ec2016-02-11 11:37:48 +01001170 gdev->data = data;
Bamvor Jian Zhang5ed41cc2015-11-16 13:02:47 +08001171
David Brownelld2876d02008-02-04 22:28:20 -08001172 spin_lock_irqsave(&gpio_lock, flags);
1173
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001174 /*
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 Vorontsov8d0aab22008-04-28 02:14:46 -07001181 if (base < 0) {
1182 base = gpiochip_find_base(chip->ngpio);
1183 if (base < 0) {
1184 status = base;
Johan Hovold225fce82015-01-12 17:12:25 +01001185 spin_unlock_irqrestore(&gpio_lock, flags);
Guenter Roeck476e2fc2016-03-31 08:11:29 -07001186 goto err_free_label;
Anton Vorontsov8d0aab22008-04-28 02:14:46 -07001187 }
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001188 /*
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 Vorontsov8d0aab22008-04-28 02:14:46 -07001194 chip->base = base;
1195 }
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001196 gdev->base = base;
Anton Vorontsov8d0aab22008-04-28 02:14:46 -07001197
Linus Walleijff2b1352015-10-20 11:10:38 +02001198 status = gpiodev_add_to_list(gdev);
Johan Hovold05aa5202015-01-12 17:12:26 +01001199 if (status) {
1200 spin_unlock_irqrestore(&gpio_lock, flags);
Guenter Roeck476e2fc2016-03-31 08:11:29 -07001201 goto err_free_label;
Johan Hovold05aa5202015-01-12 17:12:26 +01001202 }
Alexandre Courbot1a989d02013-02-03 01:29:24 +09001203
Linus Walleij545ebd92016-05-30 17:11:59 +02001204 spin_unlock_irqrestore(&gpio_lock, flags);
1205
Linus Walleijff2b1352015-10-20 11:10:38 +02001206 for (i = 0; i < chip->ngpio; i++) {
Linus Walleij1c3cdb12016-02-09 13:51:59 +01001207 struct gpio_desc *desc = &gdev->descs[i];
David Brownelld8f388d82008-07-25 01:46:07 -07001208
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001209 desc->gdev = gdev;
Linus Walleij72d32002016-04-28 13:33:59 +02001210 /*
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 Hovold05aa5202015-01-12 17:12:26 +01001217 */
Linus Walleij72d32002016-04-28 13:33:59 +02001218
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 Brownelld2876d02008-02-04 22:28:20 -08001235 }
Alexandre Courbot14e85c02014-11-19 16:51:27 +09001236
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301237#ifdef CONFIG_PINCTRL
Linus Walleij20ec3e32016-02-11 11:03:06 +01001238 INIT_LIST_HEAD(&gdev->pin_ranges);
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301239#endif
1240
Markus Pargmann5f3ca732015-08-14 16:11:00 +02001241 status = gpiochip_set_desc_names(chip);
1242 if (status)
1243 goto err_remove_from_list;
1244
Mika Westerberg79b804c2016-09-20 15:15:21 +03001245 status = gpiochip_irqchip_init_valid_mask(chip);
1246 if (status)
1247 goto err_remove_from_list;
1248
Tomeu Vizoso28355f82015-07-14 10:29:54 +02001249 status = of_gpiochip_add(chip);
1250 if (status)
1251 goto err_remove_chip;
1252
Mika Westerberg664e3e52014-01-08 12:40:54 +02001253 acpi_gpiochip_add(chip);
Anton Vorontsov391c9702010-06-08 07:48:17 -06001254
Linus Walleij3c702e92015-10-21 15:29:53 +02001255 /*
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 Roeck159f3cd2016-03-31 08:11:30 -07001260 * We can do this only if gpiolib has been initialized.
1261 * Otherwise, defer until later.
Linus Walleij3c702e92015-10-21 15:29:53 +02001262 */
Guenter Roeck159f3cd2016-03-31 08:11:30 -07001263 if (gpiolib_initialized) {
1264 status = gpiochip_setup_dev(gdev);
1265 if (status)
1266 goto err_remove_chip;
1267 }
Anton Vorontsovcedb1882010-06-08 07:48:15 -06001268 return 0;
Zhangfei Gao3bae4812013-06-09 11:08:32 +08001269
Johan Hovold225fce82015-01-12 17:12:25 +01001270err_remove_chip:
1271 acpi_gpiochip_remove(chip);
Johan Hovold6d867502015-05-04 17:23:25 +02001272 gpiochip_free_hogs(chip);
Johan Hovold225fce82015-01-12 17:12:25 +01001273 of_gpiochip_remove(chip);
Mika Westerberg79b804c2016-09-20 15:15:21 +03001274 gpiochip_irqchip_free_valid_mask(chip);
Markus Pargmann5f3ca732015-08-14 16:11:00 +02001275err_remove_from_list:
Johan Hovold225fce82015-01-12 17:12:25 +01001276 spin_lock_irqsave(&gpio_lock, flags);
Linus Walleijff2b1352015-10-20 11:10:38 +02001277 list_del(&gdev->list);
Zhangfei Gao3bae4812013-06-09 11:08:32 +08001278 spin_unlock_irqrestore(&gpio_lock, flags);
Guenter Roeck476e2fc2016-03-31 08:11:29 -07001279err_free_label:
1280 kfree(gdev->label);
1281err_free_descs:
1282 kfree(gdev->descs);
Linus Walleijff2b1352015-10-20 11:10:38 +02001283err_free_gdev:
1284 ida_simple_remove(&gpio_ida, gdev->id);
David Brownelld2876d02008-02-04 22:28:20 -08001285 /* failures here can mean systems won't boot... */
Andy Shevchenko7589e592013-12-05 11:26:23 +02001286 pr_err("%s: GPIOs %d..%d (%s) failed to register\n", __func__,
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001287 gdev->base, gdev->base + gdev->ngpio - 1,
1288 chip->label ? : "generic");
1289 kfree(gdev);
David Brownelld2876d02008-02-04 22:28:20 -08001290 return status;
1291}
Linus Walleijb08ea352015-12-03 15:14:13 +01001292EXPORT_SYMBOL_GPL(gpiochip_add_data);
David Brownelld2876d02008-02-04 22:28:20 -08001293
1294/**
Linus Walleij43c54ec2016-02-11 11:37:48 +01001295 * gpiochip_get_data() - get per-subdriver data for the chip
1296 */
1297void *gpiochip_get_data(struct gpio_chip *chip)
1298{
1299 return chip->gpiodev->data;
1300}
1301EXPORT_SYMBOL_GPL(gpiochip_get_data);
1302
1303/**
David Brownelld2876d02008-02-04 22:28:20 -08001304 * 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 berthee1db1702014-07-05 18:28:50 +02001309void gpiochip_remove(struct gpio_chip *chip)
David Brownelld2876d02008-02-04 22:28:20 -08001310{
Linus Walleijff2b1352015-10-20 11:10:38 +02001311 struct gpio_device *gdev = chip->gpiodev;
Johan Hovoldfab28b82015-05-04 17:10:27 +02001312 struct gpio_desc *desc;
David Brownelld2876d02008-02-04 22:28:20 -08001313 unsigned long flags;
Linus Walleij1c3cdb12016-02-09 13:51:59 +01001314 unsigned i;
Johan Hovoldfab28b82015-05-04 17:10:27 +02001315 bool requested = false;
David Brownelld2876d02008-02-04 22:28:20 -08001316
Linus Walleijff2b1352015-10-20 11:10:38 +02001317 /* FIXME: should the legacy sysfs handling be moved to gpio_device? */
Linus Walleijafbc4f32016-02-09 13:21:06 +01001318 gpiochip_sysfs_unregister(gdev);
Geert Uytterhoeven5018ada2016-12-19 18:29:23 +01001319 gpiochip_free_hogs(chip);
Bamvor Jian Zhangbd203bd2016-02-20 13:13:19 +08001320 /* Numb the device, cancelling all outstanding operations */
1321 gdev->chip = NULL;
Johan Hovold00acc3d2015-01-12 17:12:27 +01001322 gpiochip_irqchip_remove(chip);
Mika Westerberg6072b9d2014-03-10 14:54:53 +02001323 acpi_gpiochip_remove(chip);
Linus Walleij9ef0d6f2012-11-06 15:15:44 +01001324 gpiochip_remove_pin_ranges(chip);
Anton Vorontsov391c9702010-06-08 07:48:17 -06001325 of_gpiochip_remove(chip);
Linus Walleij43c54ec2016-02-11 11:37:48 +01001326 /*
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 Vorontsov391c9702010-06-08 07:48:17 -06001331
Johan Hovold6798aca2015-01-12 17:12:28 +01001332 spin_lock_irqsave(&gpio_lock, flags);
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001333 for (i = 0; i < gdev->ngpio; i++) {
Linus Walleij1c3cdb12016-02-09 13:51:59 +01001334 desc = &gdev->descs[i];
Johan Hovoldfab28b82015-05-04 17:10:27 +02001335 if (test_bit(FLAG_REQUESTED, &desc->flags))
1336 requested = true;
David Brownelld2876d02008-02-04 22:28:20 -08001337 }
David Brownelld2876d02008-02-04 22:28:20 -08001338 spin_unlock_irqrestore(&gpio_lock, flags);
Alexandre Courbot14e85c02014-11-19 16:51:27 +09001339
Johan Hovoldfab28b82015-05-04 17:10:27 +02001340 if (requested)
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001341 dev_crit(&gdev->dev,
Linus Walleij58383c782015-11-04 09:56:26 +01001342 "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n");
Johan Hovoldfab28b82015-05-04 17:10:27 +02001343
Linus Walleijff2b1352015-10-20 11:10:38 +02001344 /*
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 Delgadof4833b82016-06-03 19:10:02 +02001350 cdev_del(&gdev->chrdev);
1351 device_del(&gdev->dev);
Linus Walleijff2b1352015-10-20 11:10:38 +02001352 put_device(&gdev->dev);
David Brownelld2876d02008-02-04 22:28:20 -08001353}
1354EXPORT_SYMBOL_GPL(gpiochip_remove);
1355
Laxman Dewangan0cf32922016-02-15 16:32:09 +05301356static 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
1363static 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 */
1388int 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}
1410EXPORT_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 */
1419void 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 JAILLET3988d662017-01-27 12:56:42 +01001425 WARN_ON(ret);
Laxman Dewangan0cf32922016-02-15 16:32:09 +05301426}
1427EXPORT_SYMBOL_GPL(devm_gpiochip_remove);
1428
Grant Likely594fa262010-06-08 07:48:16 -06001429/**
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 Likely07ce8ec2012-05-18 23:01:05 -06001440struct gpio_chip *gpiochip_find(void *data,
Grant Likely6e2cf652012-03-02 15:56:03 -07001441 int (*match)(struct gpio_chip *chip,
Grant Likely3d0f7cf2012-05-17 13:54:40 -06001442 void *data))
Grant Likely594fa262010-06-08 07:48:16 -06001443{
Linus Walleijff2b1352015-10-20 11:10:38 +02001444 struct gpio_device *gdev;
Masahiro Yamadaacf06ff2016-08-12 01:21:58 +09001445 struct gpio_chip *chip = NULL;
Grant Likely594fa262010-06-08 07:48:16 -06001446 unsigned long flags;
Grant Likely594fa262010-06-08 07:48:16 -06001447
1448 spin_lock_irqsave(&gpio_lock, flags);
Linus Walleijff2b1352015-10-20 11:10:38 +02001449 list_for_each_entry(gdev, &gpio_devices, list)
Masahiro Yamadaacf06ff2016-08-12 01:21:58 +09001450 if (gdev->chip && match(gdev->chip, data)) {
1451 chip = gdev->chip;
Grant Likely594fa262010-06-08 07:48:16 -06001452 break;
Masahiro Yamadaacf06ff2016-08-12 01:21:58 +09001453 }
Linus Walleijff2b1352015-10-20 11:10:38 +02001454
Grant Likely594fa262010-06-08 07:48:16 -06001455 spin_unlock_irqrestore(&gpio_lock, flags);
1456
1457 return chip;
1458}
Jean Delvare8fa0c9b2011-05-20 00:40:18 -06001459EXPORT_SYMBOL_GPL(gpiochip_find);
David Brownelld2876d02008-02-04 22:28:20 -08001460
Alexandre Courbot79697ef2013-11-16 21:39:32 +09001461static 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
1468static struct gpio_chip *find_chip_by_name(const char *name)
1469{
1470 return gpiochip_find((void *)name, gpiochip_match_name);
1471}
1472
Linus Walleij14250522014-03-25 10:40:18 +01001473#ifdef CONFIG_GPIOLIB_IRQCHIP
1474
1475/*
1476 * The following is irqchip helper code for gpiochips.
1477 */
1478
Mika Westerberg79b804c2016-09-20 15:15:21 +03001479static 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
1498static 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
1504static 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 Walleij14250522014-03-25 10:40:18 +01001513/**
Linus Walleijd245b3f2016-11-24 10:57:25 +01001514 * gpiochip_set_cascaded_irqchip() - connects a cascaded irqchip to a gpiochip
Linus Walleij3f97d5fc2014-09-26 14:19:52 +02001515 * @gpiochip: the gpiochip to set the irqchip chain to
1516 * @irqchip: the irqchip to chain to the gpiochip
Linus Walleij14250522014-03-25 10:40:18 +01001517 * @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 Walleij3f97d5fc2014-09-26 14:19:52 +02001520 * coming out of the gpiochip. If the interrupt is nested rather than
1521 * cascaded, pass NULL in this handler argument
Linus Walleij14250522014-03-25 10:40:18 +01001522 */
Linus Walleijd245b3f2016-11-24 10:57:25 +01001523static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip,
1524 struct irq_chip *irqchip,
Thierry Reding6f793092017-04-03 18:05:21 +02001525 unsigned int parent_irq,
Linus Walleijd245b3f2016-11-24 10:57:25 +01001526 irq_flow_handler_t parent_handler)
Linus Walleij14250522014-03-25 10:40:18 +01001527{
Linus Walleij83141a72014-09-26 13:50:12 +02001528 unsigned int offset;
1529
Linus Walleij83141a72014-09-26 13:50:12 +02001530 if (!gpiochip->irqdomain) {
1531 chip_err(gpiochip, "called %s before setting up irqchip\n",
1532 __func__);
Linus Walleij1c8732b2014-04-09 13:34:39 +02001533 return;
1534 }
1535
Linus Walleij3f97d5fc2014-09-26 14:19:52 +02001536 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 Walleij3f97d5fc2014-09-26 14:19:52 +02001543 /*
1544 * The parent irqchip is already using the chip_data for this
1545 * irqchip, so our callbacks simply use the handler_data.
1546 */
Thomas Gleixnerf7f87752015-06-21 21:10:48 +02001547 irq_set_chained_handler_and_data(parent_irq, parent_handler,
1548 gpiochip);
Dmitry Eremin-Solenikov25e4fe92015-05-12 20:12:23 +03001549
Linus Walleijd245b3f2016-11-24 10:57:25 +01001550 gpiochip->irq_chained_parent = parent_irq;
Linus Walleij3f97d5fc2014-09-26 14:19:52 +02001551 }
Linus Walleij83141a72014-09-26 13:50:12 +02001552
1553 /* Set the parent IRQ for all affected IRQs */
Mika Westerberg79b804c2016-09-20 15:15:21 +03001554 for (offset = 0; offset < gpiochip->ngpio; offset++) {
1555 if (!gpiochip_irqchip_irq_valid(gpiochip, offset))
1556 continue;
Linus Walleij83141a72014-09-26 13:50:12 +02001557 irq_set_parent(irq_find_mapping(gpiochip->irqdomain, offset),
1558 parent_irq);
Mika Westerberg79b804c2016-09-20 15:15:21 +03001559 }
Linus Walleij14250522014-03-25 10:40:18 +01001560}
Linus Walleijd245b3f2016-11-24 10:57:25 +01001561
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 */
1572void gpiochip_set_chained_irqchip(struct gpio_chip *gpiochip,
1573 struct irq_chip *irqchip,
Thierry Reding6f793092017-04-03 18:05:21 +02001574 unsigned int parent_irq,
Linus Walleijd245b3f2016-11-24 10:57:25 +01001575 irq_flow_handler_t parent_handler)
1576{
1577 gpiochip_set_cascaded_irqchip(gpiochip, irqchip, parent_irq,
1578 parent_handler);
1579}
Linus Walleij14250522014-03-25 10:40:18 +01001580EXPORT_SYMBOL_GPL(gpiochip_set_chained_irqchip);
1581
1582/**
Linus Walleijd245b3f2016-11-24 10:57:25 +01001583 * 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 */
1589void gpiochip_set_nested_irqchip(struct gpio_chip *gpiochip,
1590 struct irq_chip *irqchip,
Thierry Reding6f793092017-04-03 18:05:21 +02001591 unsigned int parent_irq)
Linus Walleijd245b3f2016-11-24 10:57:25 +01001592{
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}
1600EXPORT_SYMBOL_GPL(gpiochip_set_nested_irqchip);
1601
1602/**
Linus Walleij14250522014-03-25 10:40:18 +01001603 * 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 */
1612static 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 Walleij14250522014-03-25 10:40:18 +01001617 irq_set_chip_data(irq, chip);
Grygorii Strashkoa0a8bcf2015-08-17 15:35:23 +03001618 /*
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 Walleij7633fb92014-04-09 13:20:38 +02001623 irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler);
Linus Walleijd245b3f2016-11-24 10:57:25 +01001624 /* Chips that use nested thread handlers have them marked */
1625 if (chip->irq_nested)
Linus Walleij1c8732b2014-04-09 13:34:39 +02001626 irq_set_nested_thread(irq, 1);
Linus Walleij14250522014-03-25 10:40:18 +01001627 irq_set_noprobe(irq);
Rob Herring23393d42015-07-27 15:55:16 -05001628
Linus Walleij1333b902014-04-23 16:45:12 +02001629 /*
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 Walleij14250522014-03-25 10:40:18 +01001635
1636 return 0;
1637}
1638
Linus Walleijc3626fd2014-03-28 20:42:01 +01001639static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq)
1640{
Linus Walleij1c8732b2014-04-09 13:34:39 +02001641 struct gpio_chip *chip = d->host_data;
1642
Linus Walleijd245b3f2016-11-24 10:57:25 +01001643 if (chip->irq_nested)
Linus Walleij1c8732b2014-04-09 13:34:39 +02001644 irq_set_nested_thread(irq, 0);
Linus Walleijc3626fd2014-03-28 20:42:01 +01001645 irq_set_chip_and_handler(irq, NULL, NULL);
1646 irq_set_chip_data(irq, NULL);
1647}
1648
Linus Walleij14250522014-03-25 10:40:18 +01001649static const struct irq_domain_ops gpiochip_domain_ops = {
1650 .map = gpiochip_irq_map,
Linus Walleijc3626fd2014-03-28 20:42:01 +01001651 .unmap = gpiochip_irq_unmap,
Linus Walleij14250522014-03-25 10:40:18 +01001652 /* Virtually all GPIO irqchips are twocell:ed */
1653 .xlate = irq_domain_xlate_twocell,
1654};
1655
1656static int gpiochip_irq_reqres(struct irq_data *d)
1657{
1658 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
1659
Linus Walleijff2b1352015-10-20 11:10:38 +02001660 if (!try_module_get(chip->gpiodev->owner))
Grygorii Strashko5b76e792015-06-25 20:30:50 +03001661 return -ENODEV;
1662
Alexandre Courbote3a2e872014-10-23 17:27:07 +09001663 if (gpiochip_lock_as_irq(chip, d->hwirq)) {
Linus Walleij14250522014-03-25 10:40:18 +01001664 chip_err(chip,
1665 "unable to lock HW IRQ %lu for IRQ\n",
1666 d->hwirq);
Linus Walleijff2b1352015-10-20 11:10:38 +02001667 module_put(chip->gpiodev->owner);
Linus Walleij14250522014-03-25 10:40:18 +01001668 return -EINVAL;
1669 }
1670 return 0;
1671}
1672
1673static void gpiochip_irq_relres(struct irq_data *d)
1674{
1675 struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
1676
Alexandre Courbote3a2e872014-10-23 17:27:07 +09001677 gpiochip_unlock_as_irq(chip, d->hwirq);
Linus Walleijff2b1352015-10-20 11:10:38 +02001678 module_put(chip->gpiodev->owner);
Linus Walleij14250522014-03-25 10:40:18 +01001679}
1680
1681static 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 */
1692static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
1693{
Linus Walleijc3626fd2014-03-28 20:42:01 +01001694 unsigned int offset;
1695
Mika Westerbergafa82fa2014-07-25 09:54:48 +03001696 acpi_gpiochip_free_interrupts(gpiochip);
1697
Linus Walleijd245b3f2016-11-24 10:57:25 +01001698 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-Solenikov25e4fe92015-05-12 20:12:23 +03001701 }
1702
Linus Walleijc3626fd2014-03-28 20:42:01 +01001703 /* Remove all IRQ mappings and delete the domain */
1704 if (gpiochip->irqdomain) {
Mika Westerberg79b804c2016-09-20 15:15:21 +03001705 for (offset = 0; offset < gpiochip->ngpio; offset++) {
1706 if (!gpiochip_irqchip_irq_valid(gpiochip, offset))
1707 continue;
Grygorii Strashkoe3893382014-09-25 19:09:23 +03001708 irq_dispose_mapping(
1709 irq_find_mapping(gpiochip->irqdomain, offset));
Mika Westerberg79b804c2016-09-20 15:15:21 +03001710 }
Linus Walleij14250522014-03-25 10:40:18 +01001711 irq_domain_remove(gpiochip->irqdomain);
Linus Walleijc3626fd2014-03-28 20:42:01 +01001712 }
Linus Walleij14250522014-03-25 10:40:18 +01001713
1714 if (gpiochip->irqchip) {
1715 gpiochip->irqchip->irq_request_resources = NULL;
1716 gpiochip->irqchip->irq_release_resources = NULL;
1717 gpiochip->irqchip = NULL;
1718 }
Mika Westerberg79b804c2016-09-20 15:15:21 +03001719
1720 gpiochip_irqchip_free_valid_mask(gpiochip);
Linus Walleij14250522014-03-25 10:40:18 +01001721}
1722
1723/**
Linus Walleij739e6f52017-01-11 13:37:07 +01001724 * gpiochip_irqchip_add_key() - adds an irqchip to a gpiochip
Linus Walleij14250522014-03-25 10:40:18 +01001725 * @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 Walleij1333b902014-04-23 16:45:12 +02001730 * @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 Walleijd245b3f2016-11-24 10:57:25 +01001732 * @nested: whether this is a nested irqchip calling handle_nested_irq()
1733 * in its IRQ handler
Grygorii Strashkoa0a8bcf2015-08-17 15:35:23 +03001734 * @lock_key: lockdep class
Linus Walleij14250522014-03-25 10:40:18 +01001735 *
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 Walleij09dd5f92015-12-07 15:31:58 +01001740 * need to use gpiochip_get_data() to get their local state containers back
Linus Walleij14250522014-03-25 10:40:18 +01001741 * 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 Walleijc3626fd2014-03-28 20:42:01 +01001746 * 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 Walleij14250522014-03-25 10:40:18 +01001748 * need to be open coded.
1749 */
Linus Walleij739e6f52017-01-11 13:37:07 +01001750int 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 Walleij14250522014-03-25 10:40:18 +01001757{
1758 struct device_node *of_node;
Mika Westerberg79b804c2016-09-20 15:15:21 +03001759 bool irq_base_set = false;
Linus Walleij14250522014-03-25 10:40:18 +01001760 unsigned int offset;
Linus Walleijc3626fd2014-03-28 20:42:01 +01001761 unsigned irq_base = 0;
Linus Walleij14250522014-03-25 10:40:18 +01001762
1763 if (!gpiochip || !irqchip)
1764 return -EINVAL;
1765
Linus Walleij58383c782015-11-04 09:56:26 +01001766 if (!gpiochip->parent) {
Linus Walleij14250522014-03-25 10:40:18 +01001767 pr_err("missing gpiochip .dev parent pointer\n");
1768 return -EINVAL;
1769 }
Linus Walleijd245b3f2016-11-24 10:57:25 +01001770 gpiochip->irq_nested = nested;
Linus Walleij58383c782015-11-04 09:56:26 +01001771 of_node = gpiochip->parent->of_node;
Linus Walleij14250522014-03-25 10:40:18 +01001772#ifdef CONFIG_OF_GPIO
1773 /*
Colin Cronin20a8a962015-05-18 11:41:43 -07001774 * If the gpiochip has an assigned OF node this takes precedence
Bamvor Jian Zhangc88402c2015-11-18 17:07:07 +08001775 * FIXME: get rid of this and use gpiochip->parent->of_node
1776 * everywhere
Linus Walleij14250522014-03-25 10:40:18 +01001777 */
1778 if (gpiochip->of_node)
1779 of_node = gpiochip->of_node;
1780#endif
Marc Zyngier332e99d2016-09-07 09:12:11 +01001781 /*
Mika Westerberg0a1e0052016-09-12 14:29:51 +03001782 * Specifying a default trigger is a terrible idea if DT or ACPI is
Marc Zyngier332e99d2016-09-07 09:12:11 +01001783 * 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 Westerberg0a1e0052016-09-12 14:29:51 +03001789 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 Zyngier332e99d2016-09-07 09:12:11 +01001794
Linus Walleij14250522014-03-25 10:40:18 +01001795 gpiochip->irqchip = irqchip;
1796 gpiochip->irq_handler = handler;
1797 gpiochip->irq_default_type = type;
1798 gpiochip->to_irq = gpiochip_to_irq;
Grygorii Strashkoa0a8bcf2015-08-17 15:35:23 +03001799 gpiochip->lock_key = lock_key;
Linus Walleij14250522014-03-25 10:40:18 +01001800 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 Vincent8b67a1f2015-07-31 14:48:56 +02001807
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 Walleij14250522014-03-25 10:40:18 +01001817
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 Walleijc3626fd2014-03-28 20:42:01 +01001823 for (offset = 0; offset < gpiochip->ngpio; offset++) {
Mika Westerberg79b804c2016-09-20 15:15:21 +03001824 if (!gpiochip_irqchip_irq_valid(gpiochip, offset))
1825 continue;
Linus Walleijc3626fd2014-03-28 20:42:01 +01001826 irq_base = irq_create_mapping(gpiochip->irqdomain, offset);
Mika Westerberg79b804c2016-09-20 15:15:21 +03001827 if (!irq_base_set) {
Linus Walleijc3626fd2014-03-28 20:42:01 +01001828 /*
1829 * Store the base into the gpiochip to be used when
1830 * unmapping the irqs.
1831 */
1832 gpiochip->irq_base = irq_base;
Mika Westerberg79b804c2016-09-20 15:15:21 +03001833 irq_base_set = true;
1834 }
Linus Walleijc3626fd2014-03-28 20:42:01 +01001835 }
Linus Walleij14250522014-03-25 10:40:18 +01001836
Mika Westerbergafa82fa2014-07-25 09:54:48 +03001837 acpi_gpiochip_request_interrupts(gpiochip);
1838
Linus Walleij14250522014-03-25 10:40:18 +01001839 return 0;
1840}
Linus Walleij739e6f52017-01-11 13:37:07 +01001841EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_key);
Linus Walleij14250522014-03-25 10:40:18 +01001842
1843#else /* CONFIG_GPIOLIB_IRQCHIP */
1844
1845static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip) {}
Mika Westerberg79b804c2016-09-20 15:15:21 +03001846static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gpiochip)
1847{
1848 return 0;
1849}
1850static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gpiochip)
1851{ }
Linus Walleij14250522014-03-25 10:40:18 +01001852
1853#endif /* CONFIG_GPIOLIB_IRQCHIP */
1854
Jonas Gorskic771c2f2015-10-11 17:34:15 +02001855/**
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 */
1860int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset)
1861{
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001862 return pinctrl_request_gpio(chip->gpiodev->base + offset);
Jonas Gorskic771c2f2015-10-11 17:34:15 +02001863}
1864EXPORT_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 */
1871void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset)
1872{
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001873 pinctrl_free_gpio(chip->gpiodev->base + offset);
Jonas Gorskic771c2f2015-10-11 17:34:15 +02001874}
1875EXPORT_SYMBOL_GPL(gpiochip_generic_free);
1876
Mika Westerberg2956b5d2017-01-23 15:34:34 +03001877/**
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 */
1883int 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}
1888EXPORT_SYMBOL_GPL(gpiochip_generic_config);
1889
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301890#ifdef CONFIG_PINCTRL
Linus Walleij165adc92012-11-06 14:49:39 +01001891
Linus Walleij3f0f8672012-11-20 12:40:15 +01001892/**
Christian Ruppert586a87e2013-10-15 15:37:54 +02001893 * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping
1894 * @chip: the gpiochip to add the range for
Tomeu Vizosod32651f2015-06-17 15:42:11 +02001895 * @pctldev: the pin controller to map to
Christian Ruppert586a87e2013-10-15 15:37:54 +02001896 * @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 */
1899int 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 Walleijfdeb8e12016-02-10 10:57:36 +01001904 struct gpio_device *gdev = chip->gpiodev;
Christian Ruppert586a87e2013-10-15 15:37:54 +02001905 int ret;
1906
1907 pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
1908 if (!pin_range) {
Andy Shevchenko1a2a99c2013-12-05 11:26:24 +02001909 chip_err(chip, "failed to allocate pin ranges\n");
Christian Ruppert586a87e2013-10-15 15:37:54 +02001910 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 Walleijfdeb8e12016-02-10 10:57:36 +01001917 pin_range->range.base = gdev->base + gpio_offset;
Christian Ruppert586a87e2013-10-15 15:37:54 +02001918 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 Nazarewicz61c63752013-11-13 21:20:39 +01001923 if (ret < 0) {
1924 kfree(pin_range);
Christian Ruppert586a87e2013-10-15 15:37:54 +02001925 return ret;
Michal Nazarewicz61c63752013-11-13 21:20:39 +01001926 }
Christian Ruppert586a87e2013-10-15 15:37:54 +02001927
1928 pinctrl_add_gpio_range(pctldev, &pin_range->range);
1929
Andy Shevchenko1a2a99c2013-12-05 11:26:24 +02001930 chip_dbg(chip, "created GPIO range %d->%d ==> %s PINGRP %s\n",
1931 gpio_offset, gpio_offset + pin_range->range.npins - 1,
Christian Ruppert586a87e2013-10-15 15:37:54 +02001932 pinctrl_dev_get_devname(pctldev), pin_group);
1933
Linus Walleij20ec3e32016-02-11 11:03:06 +01001934 list_add_tail(&pin_range->node, &gdev->pin_ranges);
Christian Ruppert586a87e2013-10-15 15:37:54 +02001935
1936 return 0;
1937}
1938EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range);
1939
1940/**
Linus Walleij3f0f8672012-11-20 12:40:15 +01001941 * 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 Walleij316511c2012-11-21 08:48:09 +01001944 * @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 Walleij3f0f8672012-11-20 12:40:15 +01001946 * @npins: the number of pins from the offset of each pin space (GPIO and
1947 * pin controller) to accumulate in this range
1948 */
Linus Walleij1e63d7b2012-11-06 16:03:35 +01001949int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
Linus Walleij316511c2012-11-21 08:48:09 +01001950 unsigned int gpio_offset, unsigned int pin_offset,
Linus Walleij3f0f8672012-11-20 12:40:15 +01001951 unsigned int npins)
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301952{
1953 struct gpio_pin_range *pin_range;
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001954 struct gpio_device *gdev = chip->gpiodev;
Axel Linb4d4b1f2012-11-21 14:33:56 +08001955 int ret;
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301956
Linus Walleij3f0f8672012-11-20 12:40:15 +01001957 pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL);
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301958 if (!pin_range) {
Andy Shevchenko1a2a99c2013-12-05 11:26:24 +02001959 chip_err(chip, "failed to allocate pin ranges\n");
Linus Walleij1e63d7b2012-11-06 16:03:35 +01001960 return -ENOMEM;
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301961 }
1962
Linus Walleij3f0f8672012-11-20 12:40:15 +01001963 /* Use local offset as range ID */
Linus Walleij316511c2012-11-21 08:48:09 +01001964 pin_range->range.id = gpio_offset;
Linus Walleij3f0f8672012-11-20 12:40:15 +01001965 pin_range->range.gc = chip;
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301966 pin_range->range.name = chip->label;
Linus Walleijfdeb8e12016-02-10 10:57:36 +01001967 pin_range->range.base = gdev->base + gpio_offset;
Linus Walleij316511c2012-11-21 08:48:09 +01001968 pin_range->range.pin_base = pin_offset;
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301969 pin_range->range.npins = npins;
Linus Walleij192c3692012-11-20 14:03:37 +01001970 pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name,
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301971 &pin_range->range);
Linus Walleij8f23ca12012-11-20 14:56:25 +01001972 if (IS_ERR(pin_range->pctldev)) {
Axel Linb4d4b1f2012-11-21 14:33:56 +08001973 ret = PTR_ERR(pin_range->pctldev);
Andy Shevchenko1a2a99c2013-12-05 11:26:24 +02001974 chip_err(chip, "could not create pin range\n");
Linus Walleij3f0f8672012-11-20 12:40:15 +01001975 kfree(pin_range);
Axel Linb4d4b1f2012-11-21 14:33:56 +08001976 return ret;
Linus Walleij3f0f8672012-11-20 12:40:15 +01001977 }
Andy Shevchenko1a2a99c2013-12-05 11:26:24 +02001978 chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n",
1979 gpio_offset, gpio_offset + npins - 1,
Linus Walleij316511c2012-11-21 08:48:09 +01001980 pinctl_name,
1981 pin_offset, pin_offset + npins - 1);
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301982
Linus Walleij20ec3e32016-02-11 11:03:06 +01001983 list_add_tail(&pin_range->node, &gdev->pin_ranges);
Linus Walleij1e63d7b2012-11-06 16:03:35 +01001984
1985 return 0;
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301986}
Linus Walleij165adc92012-11-06 14:49:39 +01001987EXPORT_SYMBOL_GPL(gpiochip_add_pin_range);
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301988
Linus Walleij3f0f8672012-11-20 12:40:15 +01001989/**
1990 * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings
1991 * @chip: the chip to remove all the mappings for
1992 */
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301993void gpiochip_remove_pin_ranges(struct gpio_chip *chip)
1994{
1995 struct gpio_pin_range *pin_range, *tmp;
Linus Walleij20ec3e32016-02-11 11:03:06 +01001996 struct gpio_device *gdev = chip->gpiodev;
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301997
Linus Walleij20ec3e32016-02-11 11:03:06 +01001998 list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) {
Shiraz Hashimf23f1512012-10-27 15:21:36 +05301999 list_del(&pin_range->node);
2000 pinctrl_remove_gpio_range(pin_range->pctldev,
2001 &pin_range->range);
Linus Walleij3f0f8672012-11-20 12:40:15 +01002002 kfree(pin_range);
Shiraz Hashimf23f1512012-10-27 15:21:36 +05302003 }
2004}
Linus Walleij165adc92012-11-06 14:49:39 +01002005EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges);
2006
2007#endif /* CONFIG_PINCTRL */
Shiraz Hashimf23f1512012-10-27 15:21:36 +05302008
David Brownelld2876d02008-02-04 22:28:20 -08002009/* 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 Westerberg77c2d792014-03-10 14:54:50 +02002013static int __gpiod_request(struct gpio_desc *desc, const char *label)
David Brownelld2876d02008-02-04 22:28:20 -08002014{
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002015 struct gpio_chip *chip = desc->gdev->chip;
Mika Westerberg77c2d792014-03-10 14:54:50 +02002016 int status;
David Brownelld2876d02008-02-04 22:28:20 -08002017 unsigned long flags;
2018
2019 spin_lock_irqsave(&gpio_lock, flags);
2020
David Brownelld2876d02008-02-04 22:28:20 -08002021 /* NOTE: gpio_request() can be called in early boot,
David Brownell35e8bb52008-10-15 22:03:16 -07002022 * before IRQs are enabled, for non-sleeping (SOC) GPIOs.
David Brownelld2876d02008-02-04 22:28:20 -08002023 */
2024
2025 if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) {
2026 desc_set_label(desc, label ? : "?");
2027 status = 0;
Guennadi Liakhovetski438d8902008-04-28 02:14:44 -07002028 } else {
David Brownelld2876d02008-02-04 22:28:20 -08002029 status = -EBUSY;
Magnus Damm7460db52009-01-29 14:25:12 -08002030 goto done;
David Brownell35e8bb52008-10-15 22:03:16 -07002031 }
2032
2033 if (chip->request) {
2034 /* chip->request may sleep */
2035 spin_unlock_irqrestore(&gpio_lock, flags);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002036 status = chip->request(chip, gpio_chip_hwgpio(desc));
David Brownell35e8bb52008-10-15 22:03:16 -07002037 spin_lock_irqsave(&gpio_lock, flags);
2038
2039 if (status < 0) {
2040 desc_set_label(desc, NULL);
David Brownell35e8bb52008-10-15 22:03:16 -07002041 clear_bit(FLAG_REQUESTED, &desc->flags);
Mathias Nyman80b0a602012-10-24 17:25:27 +03002042 goto done;
David Brownell35e8bb52008-10-15 22:03:16 -07002043 }
Guennadi Liakhovetski438d8902008-04-28 02:14:44 -07002044 }
Mathias Nyman80b0a602012-10-24 17:25:27 +03002045 if (chip->get_direction) {
2046 /* chip->get_direction may sleep */
2047 spin_unlock_irqrestore(&gpio_lock, flags);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002048 gpiod_get_direction(desc);
Mathias Nyman80b0a602012-10-24 17:25:27 +03002049 spin_lock_irqsave(&gpio_lock, flags);
2050 }
David Brownelld2876d02008-02-04 22:28:20 -08002051done:
Mika Westerberg77c2d792014-03-10 14:54:50 +02002052 spin_unlock_irqrestore(&gpio_lock, flags);
2053 return status;
2054}
2055
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002056/*
2057 * This descriptor validation needs to be inserted verbatim into each
2058 * function taking a descriptor, so we need to use a preprocessor
Linus Walleij54d77192016-05-30 16:48:39 +02002059 * macro to avoid endless duplication. If the desc is NULL it is an
2060 * optional GPIO and calls should just bail out.
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002061 */
2062#define VALIDATE_DESC(desc) do { \
Linus Walleij54d77192016-05-30 16:48:39 +02002063 if (!desc) \
2064 return 0; \
Linus Walleijbfbbe442016-06-16 11:55:55 +02002065 if (IS_ERR(desc)) { \
2066 pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \
2067 return PTR_ERR(desc); \
2068 } \
Linus Walleij54d77192016-05-30 16:48:39 +02002069 if (!desc->gdev) { \
Linus Walleijbfbbe442016-06-16 11:55:55 +02002070 pr_warn("%s: invalid GPIO (no device)\n", __func__); \
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002071 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 Walleij54d77192016-05-30 16:48:39 +02002080 if (!desc) \
2081 return; \
Linus Walleijbfbbe442016-06-16 11:55:55 +02002082 if (IS_ERR(desc)) { \
2083 pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \
2084 return; \
2085 } \
Linus Walleij54d77192016-05-30 16:48:39 +02002086 if (!desc->gdev) { \
Linus Walleijbfbbe442016-06-16 11:55:55 +02002087 pr_warn("%s: invalid GPIO (no device)\n", __func__); \
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002088 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 Courbot0eb4c6c2014-07-01 14:45:15 +09002097int gpiod_request(struct gpio_desc *desc, const char *label)
Mika Westerberg77c2d792014-03-10 14:54:50 +02002098{
2099 int status = -EPROBE_DEFER;
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002100 struct gpio_device *gdev;
Mika Westerberg77c2d792014-03-10 14:54:50 +02002101
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002102 VALIDATE_DESC(desc);
2103 gdev = desc->gdev;
Mika Westerberg77c2d792014-03-10 14:54:50 +02002104
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002105 if (try_module_get(gdev->owner)) {
Mika Westerberg77c2d792014-03-10 14:54:50 +02002106 status = __gpiod_request(desc, label);
2107 if (status < 0)
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002108 module_put(gdev->owner);
Linus Walleij33a68e82016-02-11 10:28:44 +01002109 else
2110 get_device(&gdev->dev);
Mika Westerberg77c2d792014-03-10 14:54:50 +02002111 }
2112
David Brownelld2876d02008-02-04 22:28:20 -08002113 if (status)
Andy Shevchenko7589e592013-12-05 11:26:23 +02002114 gpiod_dbg(desc, "%s: status %d\n", __func__, status);
Mika Westerberg77c2d792014-03-10 14:54:50 +02002115
David Brownelld2876d02008-02-04 22:28:20 -08002116 return status;
2117}
Alexandre Courbot372e7222013-02-03 01:29:29 +09002118
Mika Westerberg77c2d792014-03-10 14:54:50 +02002119static bool __gpiod_free(struct gpio_desc *desc)
David Brownelld2876d02008-02-04 22:28:20 -08002120{
Mika Westerberg77c2d792014-03-10 14:54:50 +02002121 bool ret = false;
David Brownelld2876d02008-02-04 22:28:20 -08002122 unsigned long flags;
David Brownell35e8bb52008-10-15 22:03:16 -07002123 struct gpio_chip *chip;
David Brownelld2876d02008-02-04 22:28:20 -08002124
Uwe Kleine-König3d599d12008-10-15 22:03:12 -07002125 might_sleep();
2126
Alexandre Courbot372e7222013-02-03 01:29:29 +09002127 gpiod_unexport(desc);
David Brownelld8f388d82008-07-25 01:46:07 -07002128
David Brownelld2876d02008-02-04 22:28:20 -08002129 spin_lock_irqsave(&gpio_lock, flags);
2130
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002131 chip = desc->gdev->chip;
David Brownell35e8bb52008-10-15 22:03:16 -07002132 if (chip && test_bit(FLAG_REQUESTED, &desc->flags)) {
2133 if (chip->free) {
2134 spin_unlock_irqrestore(&gpio_lock, flags);
David Brownell9c4ba942010-08-10 18:02:24 -07002135 might_sleep_if(chip->can_sleep);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002136 chip->free(chip, gpio_chip_hwgpio(desc));
David Brownell35e8bb52008-10-15 22:03:16 -07002137 spin_lock_irqsave(&gpio_lock, flags);
2138 }
David Brownelld2876d02008-02-04 22:28:20 -08002139 desc_set_label(desc, NULL);
Jani Nikula07697462009-12-15 16:46:20 -08002140 clear_bit(FLAG_ACTIVE_LOW, &desc->flags);
David Brownell35e8bb52008-10-15 22:03:16 -07002141 clear_bit(FLAG_REQUESTED, &desc->flags);
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302142 clear_bit(FLAG_OPEN_DRAIN, &desc->flags);
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302143 clear_bit(FLAG_OPEN_SOURCE, &desc->flags);
Benoit Parrotf625d462015-02-02 11:44:44 -06002144 clear_bit(FLAG_IS_HOGGED, &desc->flags);
Mika Westerberg77c2d792014-03-10 14:54:50 +02002145 ret = true;
2146 }
David Brownelld2876d02008-02-04 22:28:20 -08002147
2148 spin_unlock_irqrestore(&gpio_lock, flags);
Mika Westerberg77c2d792014-03-10 14:54:50 +02002149 return ret;
2150}
2151
Alexandre Courbot0eb4c6c2014-07-01 14:45:15 +09002152void gpiod_free(struct gpio_desc *desc)
Mika Westerberg77c2d792014-03-10 14:54:50 +02002153{
Linus Walleij33a68e82016-02-11 10:28:44 +01002154 if (desc && desc->gdev && __gpiod_free(desc)) {
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002155 module_put(desc->gdev->owner);
Linus Walleij33a68e82016-02-11 10:28:44 +01002156 put_device(&desc->gdev->dev);
2157 } else {
Mika Westerberg77c2d792014-03-10 14:54:50 +02002158 WARN_ON(extra_checks);
Linus Walleij33a68e82016-02-11 10:28:44 +01002159 }
David Brownelld2876d02008-02-04 22:28:20 -08002160}
Alexandre Courbot372e7222013-02-03 01:29:29 +09002161
David Brownelld2876d02008-02-04 22:28:20 -08002162/**
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 Courbot9c8318f2014-07-01 14:45:14 +09002168 * The string returned is the label passed to gpio_request(); if none has been
2169 * passed it is a meaningless, non-NULL constant.
David Brownelld2876d02008-02-04 22:28:20 -08002170 *
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 */
2175const char *gpiochip_is_requested(struct gpio_chip *chip, unsigned offset)
2176{
Alexandre Courbot6c0b4e62013-02-03 01:29:30 +09002177 struct gpio_desc *desc;
David Brownelld2876d02008-02-04 22:28:20 -08002178
Dirk Behme48b59532015-08-18 18:02:32 +02002179 if (offset >= chip->ngpio)
David Brownelld2876d02008-02-04 22:28:20 -08002180 return NULL;
Alexandre Courbot6c0b4e62013-02-03 01:29:30 +09002181
Linus Walleij1c3cdb12016-02-09 13:51:59 +01002182 desc = &chip->gpiodev->descs[offset];
Alexandre Courbot6c0b4e62013-02-03 01:29:30 +09002183
Alexandre Courbot372e7222013-02-03 01:29:29 +09002184 if (test_bit(FLAG_REQUESTED, &desc->flags) == 0)
David Brownelld2876d02008-02-04 22:28:20 -08002185 return NULL;
Alexandre Courbot372e7222013-02-03 01:29:29 +09002186 return desc->label;
David Brownelld2876d02008-02-04 22:28:20 -08002187}
2188EXPORT_SYMBOL_GPL(gpiochip_is_requested);
2189
Mika Westerberg77c2d792014-03-10 14:54:50 +02002190/**
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 Courbotabdc08a2014-08-19 10:06:09 -07002201struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *chip, u16 hwnum,
2202 const char *label)
Mika Westerberg77c2d792014-03-10 14:54:50 +02002203{
Alexandre Courbotabdc08a2014-08-19 10:06:09 -07002204 struct gpio_desc *desc = gpiochip_get_desc(chip, hwnum);
2205 int err;
Mika Westerberg77c2d792014-03-10 14:54:50 +02002206
Alexandre Courbotabdc08a2014-08-19 10:06:09 -07002207 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 Westerberg77c2d792014-03-10 14:54:50 +02002217}
Guenter Roeckf7d4ad92014-07-22 08:01:01 -07002218EXPORT_SYMBOL_GPL(gpiochip_request_own_desc);
Mika Westerberg77c2d792014-03-10 14:54:50 +02002219
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 */
2227void gpiochip_free_own_desc(struct gpio_desc *desc)
2228{
2229 if (desc)
2230 __gpiod_free(desc);
2231}
Guenter Roeckf7d4ad92014-07-22 08:01:01 -07002232EXPORT_SYMBOL_GPL(gpiochip_free_own_desc);
David Brownelld2876d02008-02-04 22:28:20 -08002233
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002234/*
2235 * Drivers MUST set GPIO direction before making get/set calls. In
David Brownelld2876d02008-02-04 22:28:20 -08002236 * 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 Courbot79a9bec2013-10-17 10:21:36 -07002244/**
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 */
2253int gpiod_direction_input(struct gpio_desc *desc)
David Brownelld2876d02008-02-04 22:28:20 -08002254{
David Brownelld2876d02008-02-04 22:28:20 -08002255 struct gpio_chip *chip;
David Brownelld2876d02008-02-04 22:28:20 -08002256 int status = -EINVAL;
2257
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002258 VALIDATE_DESC(desc);
2259 chip = desc->gdev->chip;
Alexandre Courbotbcabdef2013-02-15 14:46:14 +09002260
Linus Walleijbe1a4b12013-08-30 09:41:45 +02002261 if (!chip->get || !chip->direction_input) {
Mark Brown6424de52013-09-09 10:33:49 +01002262 gpiod_warn(desc,
2263 "%s: missing get() or direction_input() operations\n",
Andy Shevchenko7589e592013-12-05 11:26:23 +02002264 __func__);
Linus Walleijbe1a4b12013-08-30 09:41:45 +02002265 return -EIO;
2266 }
2267
Alexandre Courbotd82da792014-07-22 16:17:43 +09002268 status = chip->direction_input(chip, gpio_chip_hwgpio(desc));
David Brownelld2876d02008-02-04 22:28:20 -08002269 if (status == 0)
2270 clear_bit(FLAG_IS_OUT, &desc->flags);
Uwe Kleine-König3f397c212011-05-20 00:40:19 -06002271
Alexandre Courbot372e7222013-02-03 01:29:29 +09002272 trace_gpio_direction(desc_to_gpio(desc), 1, status);
Alexandre Courbotd82da792014-07-22 16:17:43 +09002273
David Brownelld2876d02008-02-04 22:28:20 -08002274 return status;
2275}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002276EXPORT_SYMBOL_GPL(gpiod_direction_input);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002277
Mika Westerberg2956b5d2017-01-23 15:34:34 +03002278static 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 Zabelef70bbe2014-01-07 12:34:11 +01002286static int _gpiod_direction_output_raw(struct gpio_desc *desc, int value)
David Brownelld2876d02008-02-04 22:28:20 -08002287{
Linus Walleijc663e5f2016-03-22 10:51:16 +01002288 struct gpio_chip *gc = desc->gdev->chip;
Linus Walleijad177312016-11-13 23:02:44 +01002289 int val = !!value;
Linus Walleijc663e5f2016-03-22 10:51:16 +01002290 int ret;
David Brownelld2876d02008-02-04 22:28:20 -08002291
Linus Walleijd468bf92013-09-24 11:54:38 +02002292 /* 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 Walleijc663e5f2016-03-22 10:51:16 +01002300 if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
2301 /* First see if we can enable open drain in hardware */
Mika Westerberg2956b5d2017-01-23 15:34:34 +03002302 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 Walleijc663e5f2016-03-22 10:51:16 +01002306 /* Emulate open drain by not actively driving the line high */
Linus Walleijad177312016-11-13 23:02:44 +01002307 if (val)
Linus Walleijc663e5f2016-03-22 10:51:16 +01002308 return gpiod_direction_input(desc);
2309 }
2310 else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) {
Mika Westerberg2956b5d2017-01-23 15:34:34 +03002311 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 Walleijc663e5f2016-03-22 10:51:16 +01002315 /* Emulate open source by not actively driving the line low */
Linus Walleijad177312016-11-13 23:02:44 +01002316 if (!val)
Linus Walleijc663e5f2016-03-22 10:51:16 +01002317 return gpiod_direction_input(desc);
2318 } else {
Mika Westerberg2956b5d2017-01-23 15:34:34 +03002319 gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc),
2320 PIN_CONFIG_DRIVE_PUSH_PULL);
Linus Walleijc663e5f2016-03-22 10:51:16 +01002321 }
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302322
Linus Walleijc663e5f2016-03-22 10:51:16 +01002323set_output_value:
2324 if (!gc->set || !gc->direction_output) {
Mark Brown6424de52013-09-09 10:33:49 +01002325 gpiod_warn(desc,
2326 "%s: missing set() or direction_output() operations\n",
2327 __func__);
Linus Walleijbe1a4b12013-08-30 09:41:45 +02002328 return -EIO;
2329 }
2330
Linus Walleijad177312016-11-13 23:02:44 +01002331 ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val);
Linus Walleijc663e5f2016-03-22 10:51:16 +01002332 if (!ret)
David Brownelld2876d02008-02-04 22:28:20 -08002333 set_bit(FLAG_IS_OUT, &desc->flags);
Linus Walleijad177312016-11-13 23:02:44 +01002334 trace_gpio_value(desc_to_gpio(desc), 0, val);
Linus Walleijc663e5f2016-03-22 10:51:16 +01002335 trace_gpio_direction(desc_to_gpio(desc), 0, ret);
2336 return ret;
David Brownelld2876d02008-02-04 22:28:20 -08002337}
Philipp Zabelef70bbe2014-01-07 12:34:11 +01002338
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 */
2350int gpiod_direction_output_raw(struct gpio_desc *desc, int value)
2351{
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002352 VALIDATE_DESC(desc);
Philipp Zabelef70bbe2014-01-07 12:34:11 +01002353 return _gpiod_direction_output_raw(desc, value);
2354}
2355EXPORT_SYMBOL_GPL(gpiod_direction_output_raw);
2356
2357/**
Rahul Bedarkar90df4fe2014-02-08 11:55:25 +05302358 * gpiod_direction_output - set the GPIO direction to output
Philipp Zabelef70bbe2014-01-07 12:34:11 +01002359 * @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 */
2369int gpiod_direction_output(struct gpio_desc *desc, int value)
2370{
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002371 VALIDATE_DESC(desc);
Philipp Zabelef70bbe2014-01-07 12:34:11 +01002372 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
2373 value = !value;
Linus Walleijad177312016-11-13 23:02:44 +01002374 else
2375 value = !!value;
Philipp Zabelef70bbe2014-01-07 12:34:11 +01002376 return _gpiod_direction_output_raw(desc, value);
2377}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002378EXPORT_SYMBOL_GPL(gpiod_direction_output);
David Brownelld2876d02008-02-04 22:28:20 -08002379
Felipe Balbic4b5be92010-05-26 14:42:23 -07002380/**
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002381 * gpiod_set_debounce - sets @debounce time for a @gpio
Felipe Balbic4b5be92010-05-26 14:42:23 -07002382 * @gpio: the gpio to set debounce time
2383 * @debounce: debounce time is microseconds
Linus Walleij65d87652013-09-04 14:17:08 +02002384 *
2385 * returns -ENOTSUPP if the controller does not support setting
2386 * debounce.
Felipe Balbic4b5be92010-05-26 14:42:23 -07002387 */
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002388int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce)
Felipe Balbic4b5be92010-05-26 14:42:23 -07002389{
Felipe Balbic4b5be92010-05-26 14:42:23 -07002390 struct gpio_chip *chip;
Mika Westerberg2956b5d2017-01-23 15:34:34 +03002391 unsigned long config;
Felipe Balbic4b5be92010-05-26 14:42:23 -07002392
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002393 VALIDATE_DESC(desc);
2394 chip = desc->gdev->chip;
Mika Westerberg2956b5d2017-01-23 15:34:34 +03002395 if (!chip->set || !chip->set_config) {
Mark Brown6424de52013-09-09 10:33:49 +01002396 gpiod_dbg(desc,
Mika Westerberg2956b5d2017-01-23 15:34:34 +03002397 "%s: missing set() or set_config() operations\n",
Mark Brown6424de52013-09-09 10:33:49 +01002398 __func__);
Linus Walleij65d87652013-09-04 14:17:08 +02002399 return -ENOTSUPP;
Linus Walleijbe1a4b12013-08-30 09:41:45 +02002400 }
2401
Mika Westerberg2956b5d2017-01-23 15:34:34 +03002402 config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce);
2403 return chip->set_config(chip, gpio_chip_hwgpio(desc), config);
Felipe Balbic4b5be92010-05-26 14:42:23 -07002404}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002405EXPORT_SYMBOL_GPL(gpiod_set_debounce);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002406
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002407/**
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 */
2413int gpiod_is_active_low(const struct gpio_desc *desc)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002414{
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002415 VALIDATE_DESC(desc);
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002416 return test_bit(FLAG_ACTIVE_LOW, &desc->flags);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002417}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002418EXPORT_SYMBOL_GPL(gpiod_is_active_low);
David Brownelld2876d02008-02-04 22:28:20 -08002419
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 Anderssone20538b2015-08-28 09:44:18 -07002442static int _gpiod_get_raw_value(const struct gpio_desc *desc)
David Brownelld2876d02008-02-04 22:28:20 -08002443{
2444 struct gpio_chip *chip;
Alexandre Courbot372e7222013-02-03 01:29:29 +09002445 int offset;
Bjorn Anderssone20538b2015-08-28 09:44:18 -07002446 int value;
David Brownelld2876d02008-02-04 22:28:20 -08002447
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002448 chip = desc->gdev->chip;
Alexandre Courbot372e7222013-02-03 01:29:29 +09002449 offset = gpio_chip_hwgpio(desc);
Bjorn Anderssone20538b2015-08-28 09:44:18 -07002450 value = chip->get ? chip->get(chip, offset) : -EIO;
Linus Walleij723a6302015-12-21 23:10:12 +01002451 value = value < 0 ? value : !!value;
Alexandre Courbot372e7222013-02-03 01:29:29 +09002452 trace_gpio_value(desc_to_gpio(desc), 1, value);
Uwe Kleine-König3f397c212011-05-20 00:40:19 -06002453 return value;
David Brownelld2876d02008-02-04 22:28:20 -08002454}
Alexandre Courbot372e7222013-02-03 01:29:29 +09002455
David Brownelld2876d02008-02-04 22:28:20 -08002456/**
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002457 * gpiod_get_raw_value() - return a gpio's raw value
2458 * @desc: gpio whose value will be returned
David Brownelld2876d02008-02-04 22:28:20 -08002459 *
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002460 * Return the GPIO's raw value, i.e. the value of the physical line disregarding
Bjorn Anderssone20538b2015-08-28 09:44:18 -07002461 * its ACTIVE_LOW status, or negative errno on failure.
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002462 *
2463 * This function should be called from contexts where we cannot sleep, and will
2464 * complain if the GPIO chip functions potentially sleep.
David Brownelld2876d02008-02-04 22:28:20 -08002465 */
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002466int gpiod_get_raw_value(const struct gpio_desc *desc)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002467{
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002468 VALIDATE_DESC(desc);
David Brownelld2876d02008-02-04 22:28:20 -08002469 /* Should be using gpio_get_value_cansleep() */
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002470 WARN_ON(desc->gdev->chip->can_sleep);
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002471 return _gpiod_get_raw_value(desc);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002472}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002473EXPORT_SYMBOL_GPL(gpiod_get_raw_value);
David Brownelld2876d02008-02-04 22:28:20 -08002474
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002475/**
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 Anderssone20538b2015-08-28 09:44:18 -07002480 * account, or negative errno on failure.
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002481 *
2482 * This function should be called from contexts where we cannot sleep, and will
2483 * complain if the GPIO chip functions potentially sleep.
2484 */
2485int gpiod_get_value(const struct gpio_desc *desc)
David Brownelld2876d02008-02-04 22:28:20 -08002486{
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002487 int value;
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002488
2489 VALIDATE_DESC(desc);
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002490 /* Should be using gpio_get_value_cansleep() */
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002491 WARN_ON(desc->gdev->chip->can_sleep);
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002492
2493 value = _gpiod_get_raw_value(desc);
Bjorn Anderssone20538b2015-08-28 09:44:18 -07002494 if (value < 0)
2495 return value;
2496
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002497 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
2498 value = !value;
2499
2500 return value;
David Brownelld2876d02008-02-04 22:28:20 -08002501}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002502EXPORT_SYMBOL_GPL(gpiod_get_value);
David Brownelld2876d02008-02-04 22:28:20 -08002503
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302504/*
2505 * _gpio_set_open_drain_value() - Set the open drain gpio's value.
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002506 * @desc: gpio descriptor whose state need to be set.
Colin Cronin20a8a962015-05-18 11:41:43 -07002507 * @value: Non-zero for setting it HIGH otherwise it will set to LOW.
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302508 */
Alexandre Courbot23600962014-03-11 15:52:09 +09002509static void _gpio_set_open_drain_value(struct gpio_desc *desc, bool value)
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302510{
2511 int err = 0;
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002512 struct gpio_chip *chip = desc->gdev->chip;
Alexandre Courbot372e7222013-02-03 01:29:29 +09002513 int offset = gpio_chip_hwgpio(desc);
2514
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302515 if (value) {
Alexandre Courbot372e7222013-02-03 01:29:29 +09002516 err = chip->direction_input(chip, offset);
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302517 if (!err)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002518 clear_bit(FLAG_IS_OUT, &desc->flags);
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302519 } else {
Alexandre Courbot372e7222013-02-03 01:29:29 +09002520 err = chip->direction_output(chip, offset, 0);
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302521 if (!err)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002522 set_bit(FLAG_IS_OUT, &desc->flags);
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302523 }
Alexandre Courbot372e7222013-02-03 01:29:29 +09002524 trace_gpio_direction(desc_to_gpio(desc), value, err);
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302525 if (err < 0)
Mark Brown6424de52013-09-09 10:33:49 +01002526 gpiod_err(desc,
2527 "%s: Error in set_value for open drain err %d\n",
2528 __func__, err);
Laxman Dewanganaca5ce12012-02-17 20:26:21 +05302529}
2530
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302531/*
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002532 * _gpio_set_open_source_value() - Set the open source gpio's value.
2533 * @desc: gpio descriptor whose state need to be set.
Colin Cronin20a8a962015-05-18 11:41:43 -07002534 * @value: Non-zero for setting it HIGH otherwise it will set to LOW.
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302535 */
Alexandre Courbot23600962014-03-11 15:52:09 +09002536static void _gpio_set_open_source_value(struct gpio_desc *desc, bool value)
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302537{
2538 int err = 0;
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002539 struct gpio_chip *chip = desc->gdev->chip;
Alexandre Courbot372e7222013-02-03 01:29:29 +09002540 int offset = gpio_chip_hwgpio(desc);
2541
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302542 if (value) {
Alexandre Courbot372e7222013-02-03 01:29:29 +09002543 err = chip->direction_output(chip, offset, 1);
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302544 if (!err)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002545 set_bit(FLAG_IS_OUT, &desc->flags);
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302546 } else {
Alexandre Courbot372e7222013-02-03 01:29:29 +09002547 err = chip->direction_input(chip, offset);
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302548 if (!err)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002549 clear_bit(FLAG_IS_OUT, &desc->flags);
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302550 }
Alexandre Courbot372e7222013-02-03 01:29:29 +09002551 trace_gpio_direction(desc_to_gpio(desc), !value, err);
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302552 if (err < 0)
Mark Brown6424de52013-09-09 10:33:49 +01002553 gpiod_err(desc,
2554 "%s: Error in set_value for open source err %d\n",
2555 __func__, err);
Laxman Dewangan25553ff2012-02-17 20:26:22 +05302556}
2557
Alexandre Courbot23600962014-03-11 15:52:09 +09002558static void _gpiod_set_raw_value(struct gpio_desc *desc, bool value)
David Brownelld2876d02008-02-04 22:28:20 -08002559{
2560 struct gpio_chip *chip;
2561
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002562 chip = desc->gdev->chip;
Alexandre Courbot372e7222013-02-03 01:29:29 +09002563 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 Dewanganaca5ce12012-02-17 20:26:21 +05302568 else
Alexandre Courbot372e7222013-02-03 01:29:29 +09002569 chip->set(chip, gpio_chip_hwgpio(desc), value);
2570}
2571
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002572/*
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 */
2581static 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 Shevchenko5e4e6fb2017-01-03 19:01:17 +02002587 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 Ibrahim5f424242014-11-04 17:12:06 +01002592 }
2593}
2594
Linus Walleij44c72882016-04-24 11:36:59 +02002595void 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 Ibrahim5f424242014-11-04 17:12:06 +01002599{
2600 int i = 0;
2601
2602 while (i < array_size) {
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002603 struct gpio_chip *chip = desc_array[i]->gdev->chip;
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002604 unsigned long mask[BITS_TO_LONGS(chip->ngpio)];
2605 unsigned long bits[BITS_TO_LONGS(chip->ngpio)];
2606 int count = 0;
2607
Daniel Lockyer38e003f2015-06-10 14:26:27 +01002608 if (!can_sleep)
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002609 WARN_ON(chip->can_sleep);
Daniel Lockyer38e003f2015-06-10 14:26:27 +01002610
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002611 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 Lockyer38e003f2015-06-10 14:26:27 +01002625 _gpio_set_open_drain_value(desc, value);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002626 } 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 Lockyer38e003f2015-06-10 14:26:27 +01002630 if (value)
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002631 __set_bit(hwgpio, bits);
Daniel Lockyer38e003f2015-06-10 14:26:27 +01002632 else
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002633 __clear_bit(hwgpio, bits);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002634 count++;
2635 }
2636 i++;
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002637 } while ((i < array_size) &&
2638 (desc_array[i]->gdev->chip == chip));
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002639 /* push collected bits to outputs */
Daniel Lockyer38e003f2015-06-10 14:26:27 +01002640 if (count != 0)
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002641 gpio_chip_set_multiple(chip, mask, bits);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002642 }
2643}
2644
David Brownelld2876d02008-02-04 22:28:20 -08002645/**
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002646 * gpiod_set_raw_value() - assign a gpio's raw value
2647 * @desc: gpio whose value will be assigned
David Brownelld2876d02008-02-04 22:28:20 -08002648 * @value: value to assign
David Brownelld2876d02008-02-04 22:28:20 -08002649 *
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002650 * 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 Brownelld2876d02008-02-04 22:28:20 -08002655 */
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002656void gpiod_set_raw_value(struct gpio_desc *desc, int value)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002657{
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002658 VALIDATE_DESC_VOID(desc);
Geert Uytterhoeven1cfab8f2016-03-14 16:24:12 +01002659 /* Should be using gpiod_set_value_cansleep() */
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002660 WARN_ON(desc->gdev->chip->can_sleep);
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002661 _gpiod_set_raw_value(desc, value);
David Brownelld2876d02008-02-04 22:28:20 -08002662}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002663EXPORT_SYMBOL_GPL(gpiod_set_raw_value);
David Brownelld2876d02008-02-04 22:28:20 -08002664
2665/**
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002666 * gpiod_set_value() - assign a gpio's value
2667 * @desc: gpio whose value will be assigned
2668 * @value: value to assign
David Brownelld2876d02008-02-04 22:28:20 -08002669 *
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002670 * 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 Brownelld2876d02008-02-04 22:28:20 -08002675 */
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002676void gpiod_set_value(struct gpio_desc *desc, int value)
2677{
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002678 VALIDATE_DESC_VOID(desc);
Geert Uytterhoeven1cfab8f2016-03-14 16:24:12 +01002679 /* Should be using gpiod_set_value_cansleep() */
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002680 WARN_ON(desc->gdev->chip->can_sleep);
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002681 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
2682 value = !value;
2683 _gpiod_set_raw_value(desc, value);
2684}
2685EXPORT_SYMBOL_GPL(gpiod_set_value);
2686
2687/**
Rojhalat Ibrahim3fff99b2015-05-13 11:04:56 +02002688 * gpiod_set_raw_array_value() - assign values to an array of GPIOs
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002689 * @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 Ibrahim3fff99b2015-05-13 11:04:56 +02002699void gpiod_set_raw_array_value(unsigned int array_size,
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002700 struct gpio_desc **desc_array, int *value_array)
2701{
2702 if (!desc_array)
2703 return;
Linus Walleij44c72882016-04-24 11:36:59 +02002704 gpiod_set_array_value_complex(true, false, array_size, desc_array,
2705 value_array);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002706}
Rojhalat Ibrahim3fff99b2015-05-13 11:04:56 +02002707EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002708
2709/**
Rojhalat Ibrahim3fff99b2015-05-13 11:04:56 +02002710 * gpiod_set_array_value() - assign values to an array of GPIOs
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002711 * @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 Ibrahim3fff99b2015-05-13 11:04:56 +02002721void gpiod_set_array_value(unsigned int array_size,
2722 struct gpio_desc **desc_array, int *value_array)
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002723{
2724 if (!desc_array)
2725 return;
Linus Walleij44c72882016-04-24 11:36:59 +02002726 gpiod_set_array_value_complex(false, false, array_size, desc_array,
2727 value_array);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002728}
Rojhalat Ibrahim3fff99b2015-05-13 11:04:56 +02002729EXPORT_SYMBOL_GPL(gpiod_set_array_value);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002730
2731/**
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002732 * gpiod_cansleep() - report whether gpio value access may sleep
2733 * @desc: gpio to check
2734 *
2735 */
2736int gpiod_cansleep(const struct gpio_desc *desc)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002737{
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002738 VALIDATE_DESC(desc);
2739 return desc->gdev->chip->can_sleep;
Alexandre Courbot372e7222013-02-03 01:29:29 +09002740}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002741EXPORT_SYMBOL_GPL(gpiod_cansleep);
David Brownelld2876d02008-02-04 22:28:20 -08002742
David Brownell0f6d5042008-10-15 22:03:14 -07002743/**
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002744 * gpiod_to_irq() - return the IRQ corresponding to a GPIO
2745 * @desc: gpio whose IRQ will be returned (already requested)
David Brownell0f6d5042008-10-15 22:03:14 -07002746 *
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002747 * Return the IRQ corresponding to the passed GPIO, or an error code in case of
2748 * error.
David Brownell0f6d5042008-10-15 22:03:14 -07002749 */
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002750int gpiod_to_irq(const struct gpio_desc *desc)
David Brownell0f6d5042008-10-15 22:03:14 -07002751{
Linus Walleij4c37ce82016-05-02 13:13:10 +02002752 struct gpio_chip *chip;
2753 int offset;
David Brownell0f6d5042008-10-15 22:03:14 -07002754
Linus Walleij79bb71b2016-06-15 22:57:38 +02002755 /*
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 Walleijbfbbe442016-06-16 11:55:55 +02002760 if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip)
Linus Walleij79bb71b2016-06-15 22:57:38 +02002761 return -EINVAL;
2762
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002763 chip = desc->gdev->chip;
Alexandre Courbot372e7222013-02-03 01:29:29 +09002764 offset = gpio_chip_hwgpio(desc);
Linus Walleij4c37ce82016-05-02 13:13:10 +02002765 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 Courbot372e7222013-02-03 01:29:29 +09002775}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002776EXPORT_SYMBOL_GPL(gpiod_to_irq);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002777
Linus Walleijd468bf92013-09-24 11:54:38 +02002778/**
Alexandre Courbote3a2e872014-10-23 17:27:07 +09002779 * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ
Alexandre Courbotd74be6d2014-07-22 16:17:42 +09002780 * @chip: the chip the GPIO to lock belongs to
2781 * @offset: the offset of the GPIO to lock as IRQ
Linus Walleijd468bf92013-09-24 11:54:38 +02002782 *
2783 * This is used directly by GPIO drivers that want to lock down
Linus Walleijf438acd2014-03-07 10:12:49 +08002784 * a certain GPIO line to be used for IRQs.
David Brownelld2876d02008-02-04 22:28:20 -08002785 */
Alexandre Courbote3a2e872014-10-23 17:27:07 +09002786int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset)
David Brownelld2876d02008-02-04 22:28:20 -08002787{
Linus Walleij9c102802016-05-25 10:56:03 +02002788 struct gpio_desc *desc;
Linus Walleijd468bf92013-09-24 11:54:38 +02002789
Linus Walleij9c102802016-05-25 10:56:03 +02002790 desc = gpiochip_get_desc(chip, offset);
2791 if (IS_ERR(desc))
2792 return PTR_ERR(desc);
2793
Linus Walleij60f83392016-11-12 15:01:09 +01002794 /*
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 Walleij9c102802016-05-25 10:56:03 +02002799 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 Courbotd74be6d2014-07-22 16:17:42 +09002808 chip_err(chip,
Linus Walleijd468bf92013-09-24 11:54:38 +02002809 "%s: tried to flag a GPIO set as output for IRQ\n",
2810 __func__);
2811 return -EIO;
2812 }
2813
Linus Walleij9c102802016-05-25 10:56:03 +02002814 set_bit(FLAG_USED_AS_IRQ, &desc->flags);
Linus Walleij3940c342016-11-14 00:09:07 +01002815
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 Walleijd468bf92013-09-24 11:54:38 +02002824 return 0;
2825}
Alexandre Courbote3a2e872014-10-23 17:27:07 +09002826EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq);
Linus Walleijd468bf92013-09-24 11:54:38 +02002827
Linus Walleijd468bf92013-09-24 11:54:38 +02002828/**
Alexandre Courbote3a2e872014-10-23 17:27:07 +09002829 * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ
Alexandre Courbotd74be6d2014-07-22 16:17:42 +09002830 * @chip: the chip the GPIO to lock belongs to
2831 * @offset: the offset of the GPIO to lock as IRQ
Linus Walleijd468bf92013-09-24 11:54:38 +02002832 *
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 Courbote3a2e872014-10-23 17:27:07 +09002836void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset)
Linus Walleijd468bf92013-09-24 11:54:38 +02002837{
Linus Walleij3940c342016-11-14 00:09:07 +01002838 struct gpio_desc *desc;
2839
2840 desc = gpiochip_get_desc(chip, offset);
2841 if (IS_ERR(desc))
Linus Walleijd468bf92013-09-24 11:54:38 +02002842 return;
2843
Linus Walleij3940c342016-11-14 00:09:07 +01002844 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 Walleijd468bf92013-09-24 11:54:38 +02002849}
Alexandre Courbote3a2e872014-10-23 17:27:07 +09002850EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq);
Linus Walleijd468bf92013-09-24 11:54:38 +02002851
Linus Walleij6cee3822016-02-11 20:16:45 +01002852bool 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}
2859EXPORT_SYMBOL_GPL(gpiochip_line_is_irq);
2860
Linus Walleij143b65d2016-02-16 15:41:42 +01002861bool 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}
2868EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain);
2869
2870bool 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}
2877EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source);
2878
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002879/**
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 Anderssone20538b2015-08-28 09:44:18 -07002884 * its ACTIVE_LOW status, or negative errno on failure.
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002885 *
2886 * This function is to be called from contexts that can sleep.
David Brownelld2876d02008-02-04 22:28:20 -08002887 */
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002888int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc)
David Brownelld2876d02008-02-04 22:28:20 -08002889{
David Brownelld2876d02008-02-04 22:28:20 -08002890 might_sleep_if(extra_checks);
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002891 VALIDATE_DESC(desc);
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002892 return _gpiod_get_raw_value(desc);
David Brownelld2876d02008-02-04 22:28:20 -08002893}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002894EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002895
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002896/**
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 Anderssone20538b2015-08-28 09:44:18 -07002901 * account, or negative errno on failure.
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002902 *
2903 * This function is to be called from contexts that can sleep.
2904 */
2905int gpiod_get_value_cansleep(const struct gpio_desc *desc)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002906{
David Brownelld2876d02008-02-04 22:28:20 -08002907 int value;
David Brownelld2876d02008-02-04 22:28:20 -08002908
2909 might_sleep_if(extra_checks);
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002910 VALIDATE_DESC(desc);
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002911 value = _gpiod_get_raw_value(desc);
Bjorn Anderssone20538b2015-08-28 09:44:18 -07002912 if (value < 0)
2913 return value;
2914
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002915 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
2916 value = !value;
2917
David Brownelld2876d02008-02-04 22:28:20 -08002918 return value;
2919}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002920EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002921
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002922/**
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 */
2932void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002933{
David Brownelld2876d02008-02-04 22:28:20 -08002934 might_sleep_if(extra_checks);
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002935 VALIDATE_DESC_VOID(desc);
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002936 _gpiod_set_raw_value(desc, value);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002937}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002938EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep);
Alexandre Courbot372e7222013-02-03 01:29:29 +09002939
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002940/**
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 */
2950void gpiod_set_value_cansleep(struct gpio_desc *desc, int value)
Alexandre Courbot372e7222013-02-03 01:29:29 +09002951{
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002952 might_sleep_if(extra_checks);
Linus Walleijfdeb8e12016-02-10 10:57:36 +01002953 VALIDATE_DESC_VOID(desc);
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002954 if (test_bit(FLAG_ACTIVE_LOW, &desc->flags))
2955 value = !value;
2956 _gpiod_set_raw_value(desc, value);
David Brownelld2876d02008-02-04 22:28:20 -08002957}
Alexandre Courbot79a9bec2013-10-17 10:21:36 -07002958EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep);
David Brownelld2876d02008-02-04 22:28:20 -08002959
Alexandre Courbotbae48da2013-10-17 10:21:38 -07002960/**
Rojhalat Ibrahim3fff99b2015-05-13 11:04:56 +02002961 * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002962 * @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 Ibrahim3fff99b2015-05-13 11:04:56 +02002971void gpiod_set_raw_array_value_cansleep(unsigned int array_size,
2972 struct gpio_desc **desc_array,
2973 int *value_array)
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002974{
2975 might_sleep_if(extra_checks);
2976 if (!desc_array)
2977 return;
Linus Walleij44c72882016-04-24 11:36:59 +02002978 gpiod_set_array_value_complex(true, true, array_size, desc_array,
2979 value_array);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002980}
Rojhalat Ibrahim3fff99b2015-05-13 11:04:56 +02002981EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002982
2983/**
Rojhalat Ibrahim3fff99b2015-05-13 11:04:56 +02002984 * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002985 * @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 Ibrahim3fff99b2015-05-13 11:04:56 +02002994void gpiod_set_array_value_cansleep(unsigned int array_size,
2995 struct gpio_desc **desc_array,
2996 int *value_array)
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01002997{
2998 might_sleep_if(extra_checks);
2999 if (!desc_array)
3000 return;
Linus Walleij44c72882016-04-24 11:36:59 +02003001 gpiod_set_array_value_complex(false, true, array_size, desc_array,
3002 value_array);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01003003}
Rojhalat Ibrahim3fff99b2015-05-13 11:04:56 +02003004EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep);
Rojhalat Ibrahim5f424242014-11-04 17:12:06 +01003005
3006/**
Alexandre Courbotad824782013-12-03 12:20:11 +09003007 * gpiod_add_lookup_table() - register GPIO device consumers
3008 * @table: table of consumers to register
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003009 */
Alexandre Courbotad824782013-12-03 12:20:11 +09003010void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003011{
3012 mutex_lock(&gpio_lookup_lock);
3013
Alexandre Courbotad824782013-12-03 12:20:11 +09003014 list_add_tail(&table->list, &gpio_lookup_list);
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003015
3016 mutex_unlock(&gpio_lookup_lock);
David Brownelld2876d02008-02-04 22:28:20 -08003017}
3018
Shobhit Kumarbe9015a2015-06-26 14:32:04 +05303019/**
3020 * gpiod_remove_lookup_table() - unregister GPIO device consumers
3021 * @table: table of consumers to unregister
3022 */
3023void 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 Courbotad824782013-12-03 12:20:11 +09003032static 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
3058found:
3059 mutex_unlock(&gpio_lookup_lock);
3060 return table;
3061}
3062
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003063static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
Alexandre Courbot53e7cac2013-11-16 21:44:52 +09003064 unsigned int idx,
3065 enum gpio_lookup_flags *flags)
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003066{
Alexandre Courbot2a3cf6a2013-12-11 11:32:28 +09003067 struct gpio_desc *desc = ERR_PTR(-ENOENT);
Alexandre Courbotad824782013-12-03 12:20:11 +09003068 struct gpiod_lookup_table *table;
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003069 struct gpiod_lookup *p;
3070
Alexandre Courbotad824782013-12-03 12:20:11 +09003071 table = gpiod_find_lookup_table(dev);
3072 if (!table)
3073 return desc;
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003074
Alexandre Courbotad824782013-12-03 12:20:11 +09003075 for (p = &table->table[0]; p->chip_label; p++) {
3076 struct gpio_chip *chip;
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003077
Alexandre Courbotad824782013-12-03 12:20:11 +09003078 /* idx must always match exactly */
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003079 if (p->idx != idx)
3080 continue;
3081
Alexandre Courbotad824782013-12-03 12:20:11 +09003082 /* 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 Courbotbae48da2013-10-17 10:21:38 -07003085
Alexandre Courbotad824782013-12-03 12:20:11 +09003086 chip = find_chip_by_name(p->chip_label);
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003087
Alexandre Courbotad824782013-12-03 12:20:11 +09003088 if (!chip) {
Alexandre Courbot2a3cf6a2013-12-11 11:32:28 +09003089 dev_err(dev, "cannot find GPIO chip %s\n",
3090 p->chip_label);
3091 return ERR_PTR(-ENODEV);
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003092 }
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003093
Alexandre Courbotad824782013-12-03 12:20:11 +09003094 if (chip->ngpio <= p->chip_hwnum) {
Alexandre Courbot2a3cf6a2013-12-11 11:32:28 +09003095 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 Courbotad824782013-12-03 12:20:11 +09003099 }
3100
Alexandre Courbotbb1e88c2014-02-09 17:43:54 +09003101 desc = gpiochip_get_desc(chip, p->chip_hwnum);
Alexandre Courbotad824782013-12-03 12:20:11 +09003102 *flags = p->flags;
Alexandre Courbot2a3cf6a2013-12-11 11:32:28 +09003103
3104 return desc;
Alexandre Courbotad824782013-12-03 12:20:11 +09003105 }
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003106
3107 return desc;
3108}
3109
Rojhalat Ibrahim66858522015-02-11 17:27:58 +01003110static 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 Shevchenko4033d4a2017-02-20 18:15:47 +02003125 if (ret > 0)
Rojhalat Ibrahim66858522015-02-11 17:27:58 +01003126 break;
3127 }
Andy Shevchenko4033d4a2017-02-20 18:15:47 +02003128 return ret ? ret : -ENOENT;
Rojhalat Ibrahim66858522015-02-11 17:27:58 +01003129}
3130
3131static 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 */
3158int 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}
3172EXPORT_SYMBOL_GPL(gpiod_count);
3173
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003174/**
Thierry Reding08791622014-04-25 16:54:22 +02003175 * gpiod_get - obtain a GPIO for a given GPIO function
Alexandre Courbotad824782013-12-03 12:20:11 +09003176 * @dev: GPIO consumer, can be NULL for system-global GPIOs
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003177 * @con_id: function within the GPIO consumer
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003178 * @flags: optional GPIO initialization flags
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003179 *
3180 * Return the GPIO descriptor corresponding to the function con_id of device
Alexandre Courbot2a3cf6a2013-12-11 11:32:28 +09003181 * dev, -ENOENT if no GPIO has been assigned to the requested function, or
Colin Cronin20a8a962015-05-18 11:41:43 -07003182 * another IS_ERR() code if an error occurred while trying to acquire the GPIO.
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003183 */
Uwe Kleine-Königb17d1bf2015-02-11 11:52:37 +01003184struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id,
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003185 enum gpiod_flags flags)
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003186{
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003187 return gpiod_get_index(dev, con_id, 0, flags);
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003188}
Uwe Kleine-Königb17d1bf2015-02-11 11:52:37 +01003189EXPORT_SYMBOL_GPL(gpiod_get);
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003190
3191/**
Thierry Reding29a1f2332014-04-25 17:10:06 +02003192 * 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 Courbot39b2bbe2014-07-25 23:38:36 +09003195 * @flags: optional GPIO initialization flags
Thierry Reding29a1f2332014-04-25 17:10:06 +02003196 *
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-Königb17d1bf2015-02-11 11:52:37 +01003201struct gpio_desc *__must_check gpiod_get_optional(struct device *dev,
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003202 const char *con_id,
3203 enum gpiod_flags flags)
Thierry Reding29a1f2332014-04-25 17:10:06 +02003204{
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003205 return gpiod_get_index_optional(dev, con_id, 0, flags);
Thierry Reding29a1f2332014-04-25 17:10:06 +02003206}
Uwe Kleine-Königb17d1bf2015-02-11 11:52:37 +01003207EXPORT_SYMBOL_GPL(gpiod_get_optional);
Thierry Reding29a1f2332014-04-25 17:10:06 +02003208
Benoit Parrotf625d462015-02-02 11:44:44 -06003209
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 Hovold85b03b32016-07-03 18:32:05 +02003214 * @lflags: gpio_lookup_flags - returned from of_find_gpio() or
3215 * of_get_gpio_hog()
Benoit Parrotf625d462015-02-02 11:44:44 -06003216 * @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 */
3222static int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id,
Johan Hovold85b03b32016-07-03 18:32:05 +02003223 unsigned long lflags, enum gpiod_flags dflags)
Benoit Parrotf625d462015-02-02 11:44:44 -06003224{
3225 int status;
3226
Johan Hovold85b03b32016-07-03 18:32:05 +02003227 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 Parrotf625d462015-02-02 11:44:44 -06003234 /* 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 Walleijad177312016-11-13 23:02:44 +01003243 !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL));
Benoit Parrotf625d462015-02-02 11:44:44 -06003244 else
3245 status = gpiod_direction_input(desc);
3246
3247 return status;
3248}
3249
Thierry Reding29a1f2332014-04-25 17:10:06 +02003250/**
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003251 * gpiod_get_index - obtain a GPIO from a multi-index GPIO function
Andy Shevchenkofdd6a5f2013-12-05 11:26:26 +02003252 * @dev: GPIO consumer, can be NULL for system-global GPIOs
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003253 * @con_id: function within the GPIO consumer
3254 * @idx: index of the GPIO to obtain in the consumer
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003255 * @flags: optional GPIO initialization flags
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003256 *
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 Courbot2a3cf6a2013-12-11 11:32:28 +09003260 * 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 Cronin20a8a962015-05-18 11:41:43 -07003262 * occurred while trying to acquire the GPIO.
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003263 */
Uwe Kleine-Königb17d1bf2015-02-11 11:52:37 +01003264struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003265 const char *con_id,
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003266 unsigned int idx,
3267 enum gpiod_flags flags)
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003268{
Alexandre Courbot35c5d7f2013-11-23 19:34:50 +09003269 struct gpio_desc *desc = NULL;
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003270 int status;
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003271 enum gpio_lookup_flags lookupflags = 0;
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003272
3273 dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id);
3274
Rafael J. Wysocki4d8440b2015-03-10 23:08:57 +01003275 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 Torokhov25487532016-03-24 10:50:25 -07003282 desc = acpi_find_gpio(dev, con_id, idx, flags, &lookupflags);
Rafael J. Wysocki4d8440b2015-03-10 23:08:57 +01003283 }
Alexandre Courbot35c5d7f2013-11-23 19:34:50 +09003284 }
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 Courbot2a3cf6a2013-12-11 11:32:28 +09003290 if (!desc || desc == ERR_PTR(-ENOENT)) {
Alexander Shiyan43a87852014-09-19 11:39:25 +04003291 dev_dbg(dev, "using lookup tables for GPIO lookup\n");
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003292 desc = gpiod_find(dev, con_id, idx, &lookupflags);
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003293 }
3294
3295 if (IS_ERR(desc)) {
Heikki Krogerus351cfe02013-11-29 15:47:34 +02003296 dev_dbg(dev, "lookup for GPIO %s failed\n", con_id);
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003297 return desc;
3298 }
3299
3300 status = gpiod_request(desc, con_id);
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003301 if (status < 0)
3302 return ERR_PTR(status);
3303
Johan Hovold85b03b32016-07-03 18:32:05 +02003304 status = gpiod_configure_flags(desc, con_id, lookupflags, flags);
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003305 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 Courbotbae48da2013-10-17 10:21:38 -07003311 return desc;
3312}
Uwe Kleine-Königb17d1bf2015-02-11 11:52:37 +01003313EXPORT_SYMBOL_GPL(gpiod_get_index);
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003314
3315/**
Mika Westerberg40b73182014-10-21 13:33:59 +02003316 * 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 Brezillon537b94d2017-02-02 14:53:11 +01003319 * @index: index of the GPIO to obtain in the consumer
Andy Shevchenkoa264d102017-01-09 16:02:28 +02003320 * @dflags: GPIO initialization flags
Mika Westerberg40b73182014-10-21 13:33:59 +02003321 *
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 Shevchenkoff213782017-02-28 17:03:12 +02003329 * On successful request the GPIO pin is configured in accordance with
Andy Shevchenkoa264d102017-01-09 16:02:28 +02003330 * provided @dflags.
3331 *
Mika Westerberg40b73182014-10-21 13:33:59 +02003332 * In case of error an ERR_PTR() is returned.
3333 */
3334struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode,
Boris Brezillon537b94d2017-02-02 14:53:11 +01003335 const char *propname, int index,
Alexander Steinb2987d72017-01-12 17:39:24 +01003336 enum gpiod_flags dflags,
3337 const char *label)
Mika Westerberg40b73182014-10-21 13:33:59 +02003338{
3339 struct gpio_desc *desc = ERR_PTR(-ENODEV);
Andy Shevchenkoa264d102017-01-09 16:02:28 +02003340 unsigned long lflags = 0;
Mika Westerberg40b73182014-10-21 13:33:59 +02003341 bool active_low = false;
Laurent Pinchart90b665f2015-10-13 00:20:21 +03003342 bool single_ended = false;
Laxman Dewangan4c0facd2017-04-06 19:05:52 +05303343 bool open_drain = false;
Mika Westerberg40b73182014-10-21 13:33:59 +02003344 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 Brezillon537b94d2017-02-02 14:53:11 +01003352 desc = of_get_named_gpiod_flags(to_of_node(fwnode), propname,
3353 index, &flags);
Laurent Pinchart90b665f2015-10-13 00:20:21 +03003354 if (!IS_ERR(desc)) {
Mika Westerberg40b73182014-10-21 13:33:59 +02003355 active_low = flags & OF_GPIO_ACTIVE_LOW;
Laurent Pinchart90b665f2015-10-13 00:20:21 +03003356 single_ended = flags & OF_GPIO_SINGLE_ENDED;
Laxman Dewangan4c0facd2017-04-06 19:05:52 +05303357 open_drain = flags & OF_GPIO_OPEN_DRAIN;
Laurent Pinchart90b665f2015-10-13 00:20:21 +03003358 }
Mika Westerberg40b73182014-10-21 13:33:59 +02003359 } else if (is_acpi_node(fwnode)) {
3360 struct acpi_gpio_info info;
3361
Boris Brezillon537b94d2017-02-02 14:53:11 +01003362 desc = acpi_node_get_gpiod(fwnode, propname, index, &info);
Mika Westerberg40b73182014-10-21 13:33:59 +02003363 if (!IS_ERR(desc))
Christophe RICARD52044722015-12-23 23:25:34 +01003364 active_low = info.polarity == GPIO_ACTIVE_LOW;
Mika Westerberg40b73182014-10-21 13:33:59 +02003365 }
3366
3367 if (IS_ERR(desc))
3368 return desc;
3369
Alexander Steinb2987d72017-01-12 17:39:24 +01003370 ret = gpiod_request(desc, label);
Johan Hovold85b03b32016-07-03 18:32:05 +02003371 if (ret)
3372 return ERR_PTR(ret);
3373
Mika Westerberg40b73182014-10-21 13:33:59 +02003374 if (active_low)
Andy Shevchenkoa264d102017-01-09 16:02:28 +02003375 lflags |= GPIO_ACTIVE_LOW;
Mika Westerberg40b73182014-10-21 13:33:59 +02003376
Laurent Pinchart90b665f2015-10-13 00:20:21 +03003377 if (single_ended) {
Laxman Dewangan4c0facd2017-04-06 19:05:52 +05303378 if (open_drain)
Andy Shevchenkoa264d102017-01-09 16:02:28 +02003379 lflags |= GPIO_OPEN_DRAIN;
Laurent Pinchart90b665f2015-10-13 00:20:21 +03003380 else
Andy Shevchenkoa264d102017-01-09 16:02:28 +02003381 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 Pinchart90b665f2015-10-13 00:20:21 +03003388 }
3389
Mika Westerberg40b73182014-10-21 13:33:59 +02003390 return desc;
3391}
3392EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod);
3393
3394/**
Thierry Reding29a1f2332014-04-25 17:10:06 +02003395 * 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 Courbot39b2bbe2014-07-25 23:38:36 +09003400 * @flags: optional GPIO initialization flags
Thierry Reding29a1f2332014-04-25 17:10:06 +02003401 *
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-Königb17d1bf2015-02-11 11:52:37 +01003406struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev,
Thierry Reding29a1f2332014-04-25 17:10:06 +02003407 const char *con_id,
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003408 unsigned int index,
3409 enum gpiod_flags flags)
Thierry Reding29a1f2332014-04-25 17:10:06 +02003410{
3411 struct gpio_desc *desc;
3412
Alexandre Courbot39b2bbe2014-07-25 23:38:36 +09003413 desc = gpiod_get_index(dev, con_id, index, flags);
Thierry Reding29a1f2332014-04-25 17:10:06 +02003414 if (IS_ERR(desc)) {
3415 if (PTR_ERR(desc) == -ENOENT)
3416 return NULL;
3417 }
3418
3419 return desc;
3420}
Uwe Kleine-Königb17d1bf2015-02-11 11:52:37 +01003421EXPORT_SYMBOL_GPL(gpiod_get_index_optional);
Thierry Reding29a1f2332014-04-25 17:10:06 +02003422
3423/**
Benoit Parrotf625d462015-02-02 11:44:44 -06003424 * 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 */
3431int 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 Dewanganc31a5712016-03-11 19:13:21 +05303444 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 Parrotf625d462015-02-02 11:44:44 -06003448 }
3449
Johan Hovold85b03b32016-07-03 18:32:05 +02003450 status = gpiod_configure_flags(desc, name, lflags, dflags);
Benoit Parrotf625d462015-02-02 11:44:44 -06003451 if (status < 0) {
Laxman Dewanganc31a5712016-03-11 19:13:21 +05303452 pr_err("setup of hog GPIO %s (chip %s, offset %d) failed, %d\n",
3453 name, chip->label, hwnum, status);
Benoit Parrotf625d462015-02-02 11:44:44 -06003454 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 */
3476static void gpiochip_free_hogs(struct gpio_chip *chip)
3477{
3478 int id;
3479
3480 for (id = 0; id < chip->ngpio; id++) {
Linus Walleij1c3cdb12016-02-09 13:51:59 +01003481 if (test_bit(FLAG_IS_HOGGED, &chip->gpiodev->descs[id].flags))
3482 gpiochip_free_own_desc(&chip->gpiodev->descs[id]);
Benoit Parrotf625d462015-02-02 11:44:44 -06003483 }
3484}
3485
3486/**
Rojhalat Ibrahim66858522015-02-11 17:27:58 +01003487 * 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 */
3498struct 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}
3526EXPORT_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 */
3538struct 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}
3550EXPORT_SYMBOL_GPL(gpiod_get_array_optional);
3551
3552/**
Alexandre Courbotbae48da2013-10-17 10:21:38 -07003553 * 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 */
3558void gpiod_put(struct gpio_desc *desc)
3559{
3560 gpiod_free(desc);
3561}
3562EXPORT_SYMBOL_GPL(gpiod_put);
David Brownelld2876d02008-02-04 22:28:20 -08003563
Rojhalat Ibrahim66858522015-02-11 17:27:58 +01003564/**
3565 * gpiod_put_array - dispose of multiple GPIO descriptors
3566 * @descs: struct gpio_descs containing an array of descriptors
3567 */
3568void 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}
3577EXPORT_SYMBOL_GPL(gpiod_put_array);
3578
Linus Walleij3c702e92015-10-21 15:29:53 +02003579static 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 Roeck159f3cd2016-03-31 08:11:30 -07003594 } else {
3595 gpiolib_initialized = true;
3596 gpiochip_setup_devs();
Linus Walleij3c702e92015-10-21 15:29:53 +02003597 }
3598 return ret;
3599}
3600core_initcall(gpiolib_dev_init);
3601
David Brownelld2876d02008-02-04 22:28:20 -08003602#ifdef CONFIG_DEBUG_FS
3603
Linus Walleijfdeb8e12016-02-10 10:57:36 +01003604static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
David Brownelld2876d02008-02-04 22:28:20 -08003605{
3606 unsigned i;
Linus Walleijfdeb8e12016-02-10 10:57:36 +01003607 struct gpio_chip *chip = gdev->chip;
3608 unsigned gpio = gdev->base;
3609 struct gpio_desc *gdesc = &gdev->descs[0];
David Brownelld2876d02008-02-04 22:28:20 -08003610 int is_out;
Linus Walleijd468bf92013-09-24 11:54:38 +02003611 int is_irq;
David Brownelld2876d02008-02-04 22:28:20 -08003612
Linus Walleijfdeb8e12016-02-10 10:57:36 +01003613 for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) {
Markus Pargmannced433e2015-08-14 16:11:02 +02003614 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 Brownelld2876d02008-02-04 22:28:20 -08003619 continue;
Markus Pargmannced433e2015-08-14 16:11:02 +02003620 }
David Brownelld2876d02008-02-04 22:28:20 -08003621
Alexandre Courbot372e7222013-02-03 01:29:29 +09003622 gpiod_get_direction(gdesc);
David Brownelld2876d02008-02-04 22:28:20 -08003623 is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
Linus Walleijd468bf92013-09-24 11:54:38 +02003624 is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags);
Markus Pargmannced433e2015-08-14 16:11:02 +02003625 seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s",
3626 gpio, gdesc->name ? gdesc->name : "", gdesc->label,
David Brownelld2876d02008-02-04 22:28:20 -08003627 is_out ? "out" : "in ",
3628 chip->get
3629 ? (chip->get(chip, i) ? "hi" : "lo")
Linus Walleijd468bf92013-09-24 11:54:38 +02003630 : "? ",
3631 is_irq ? "IRQ" : " ");
David Brownelld2876d02008-02-04 22:28:20 -08003632 seq_printf(s, "\n");
3633 }
3634}
3635
Thierry Redingf9c4a312012-04-12 13:26:01 +02003636static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos)
David Brownelld2876d02008-02-04 22:28:20 -08003637{
Grant Likely362432a2013-02-09 09:41:49 +00003638 unsigned long flags;
Linus Walleijff2b1352015-10-20 11:10:38 +02003639 struct gpio_device *gdev = NULL;
Alexandre Courbotcb1650d2013-02-03 01:29:27 +09003640 loff_t index = *pos;
Thierry Redingf9c4a312012-04-12 13:26:01 +02003641
3642 s->private = "";
3643
Grant Likely362432a2013-02-09 09:41:49 +00003644 spin_lock_irqsave(&gpio_lock, flags);
Linus Walleijff2b1352015-10-20 11:10:38 +02003645 list_for_each_entry(gdev, &gpio_devices, list)
Grant Likely362432a2013-02-09 09:41:49 +00003646 if (index-- == 0) {
3647 spin_unlock_irqrestore(&gpio_lock, flags);
Linus Walleijff2b1352015-10-20 11:10:38 +02003648 return gdev;
Grant Likely362432a2013-02-09 09:41:49 +00003649 }
3650 spin_unlock_irqrestore(&gpio_lock, flags);
Alexandre Courbotcb1650d2013-02-03 01:29:27 +09003651
3652 return NULL;
Thierry Redingf9c4a312012-04-12 13:26:01 +02003653}
3654
3655static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos)
3656{
Grant Likely362432a2013-02-09 09:41:49 +00003657 unsigned long flags;
Linus Walleijff2b1352015-10-20 11:10:38 +02003658 struct gpio_device *gdev = v;
Thierry Redingf9c4a312012-04-12 13:26:01 +02003659 void *ret = NULL;
3660
Grant Likely362432a2013-02-09 09:41:49 +00003661 spin_lock_irqsave(&gpio_lock, flags);
Linus Walleijff2b1352015-10-20 11:10:38 +02003662 if (list_is_last(&gdev->list, &gpio_devices))
Alexandre Courbotcb1650d2013-02-03 01:29:27 +09003663 ret = NULL;
3664 else
Linus Walleijff2b1352015-10-20 11:10:38 +02003665 ret = list_entry(gdev->list.next, struct gpio_device, list);
Grant Likely362432a2013-02-09 09:41:49 +00003666 spin_unlock_irqrestore(&gpio_lock, flags);
Thierry Redingf9c4a312012-04-12 13:26:01 +02003667
3668 s->private = "\n";
3669 ++*pos;
3670
3671 return ret;
3672}
3673
3674static void gpiolib_seq_stop(struct seq_file *s, void *v)
3675{
3676}
3677
3678static int gpiolib_seq_show(struct seq_file *s, void *v)
3679{
Linus Walleijff2b1352015-10-20 11:10:38 +02003680 struct gpio_device *gdev = v;
3681 struct gpio_chip *chip = gdev->chip;
3682 struct device *parent;
Thierry Redingf9c4a312012-04-12 13:26:01 +02003683
Linus Walleijff2b1352015-10-20 11:10:38 +02003684 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 Walleijfdeb8e12016-02-10 10:57:36 +01003692 gdev->base, gdev->base + gdev->ngpio - 1);
Linus Walleijff2b1352015-10-20 11:10:38 +02003693 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 Redingf9c4a312012-04-12 13:26:01 +02003698 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 Walleijfdeb8e12016-02-10 10:57:36 +01003707 gpiolib_dbg_show(s, gdev);
Thierry Redingf9c4a312012-04-12 13:26:01 +02003708
David Brownelld2876d02008-02-04 22:28:20 -08003709 return 0;
3710}
3711
Thierry Redingf9c4a312012-04-12 13:26:01 +02003712static 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 Brownelld2876d02008-02-04 22:28:20 -08003719static int gpiolib_open(struct inode *inode, struct file *file)
3720{
Thierry Redingf9c4a312012-04-12 13:26:01 +02003721 return seq_open(file, &gpiolib_seq_ops);
David Brownelld2876d02008-02-04 22:28:20 -08003722}
3723
Alexey Dobriyan828c0952009-10-01 15:43:56 -07003724static const struct file_operations gpiolib_operations = {
Thierry Redingf9c4a312012-04-12 13:26:01 +02003725 .owner = THIS_MODULE,
David Brownelld2876d02008-02-04 22:28:20 -08003726 .open = gpiolib_open,
3727 .read = seq_read,
3728 .llseek = seq_lseek,
Thierry Redingf9c4a312012-04-12 13:26:01 +02003729 .release = seq_release,
David Brownelld2876d02008-02-04 22:28:20 -08003730};
3731
3732static 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}
3739subsys_initcall(gpiolib_debugfs_init);
3740
3741#endif /* DEBUG_FS */