Raphael Assenat | 22e03f3 | 2007-02-27 19:49:53 +0000 | [diff] [blame] | 1 | /* |
| 2 | * LEDs driver for GPIOs |
| 3 | * |
| 4 | * Copyright (C) 2007 8D Technologies inc. |
| 5 | * Raphael Assenat <raph@8d.com> |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 6 | * Copyright (C) 2008 Freescale Semiconductor, Inc. |
Raphael Assenat | 22e03f3 | 2007-02-27 19:49:53 +0000 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | * |
| 12 | */ |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/leds.h> |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 17 | #include <linux/of_platform.h> |
| 18 | #include <linux/of_gpio.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 19 | #include <linux/slab.h> |
David Brownell | 0085227 | 2007-05-10 10:51:41 +0100 | [diff] [blame] | 20 | #include <linux/workqueue.h> |
| 21 | |
Raphael Assenat | 22e03f3 | 2007-02-27 19:49:53 +0000 | [diff] [blame] | 22 | #include <asm/gpio.h> |
| 23 | |
| 24 | struct gpio_led_data { |
| 25 | struct led_classdev cdev; |
| 26 | unsigned gpio; |
David Brownell | 0085227 | 2007-05-10 10:51:41 +0100 | [diff] [blame] | 27 | struct work_struct work; |
| 28 | u8 new_level; |
| 29 | u8 can_sleep; |
Raphael Assenat | 22e03f3 | 2007-02-27 19:49:53 +0000 | [diff] [blame] | 30 | u8 active_low; |
Benjamin Herrenschmidt | 2146325 | 2010-05-22 20:54:55 +1000 | [diff] [blame] | 31 | u8 blinking; |
| 32 | int (*platform_gpio_blink_set)(unsigned gpio, int state, |
Herbert Valerio Riedel | ca3259b | 2008-03-09 23:48:25 +0000 | [diff] [blame] | 33 | unsigned long *delay_on, unsigned long *delay_off); |
Raphael Assenat | 22e03f3 | 2007-02-27 19:49:53 +0000 | [diff] [blame] | 34 | }; |
| 35 | |
David Brownell | 0085227 | 2007-05-10 10:51:41 +0100 | [diff] [blame] | 36 | static void gpio_led_work(struct work_struct *work) |
| 37 | { |
| 38 | struct gpio_led_data *led_dat = |
| 39 | container_of(work, struct gpio_led_data, work); |
| 40 | |
Benjamin Herrenschmidt | 2146325 | 2010-05-22 20:54:55 +1000 | [diff] [blame] | 41 | if (led_dat->blinking) { |
| 42 | led_dat->platform_gpio_blink_set(led_dat->gpio, |
| 43 | led_dat->new_level, |
| 44 | NULL, NULL); |
| 45 | led_dat->blinking = 0; |
| 46 | } else |
| 47 | gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level); |
David Brownell | 0085227 | 2007-05-10 10:51:41 +0100 | [diff] [blame] | 48 | } |
Raphael Assenat | 22e03f3 | 2007-02-27 19:49:53 +0000 | [diff] [blame] | 49 | |
| 50 | static void gpio_led_set(struct led_classdev *led_cdev, |
| 51 | enum led_brightness value) |
| 52 | { |
| 53 | struct gpio_led_data *led_dat = |
| 54 | container_of(led_cdev, struct gpio_led_data, cdev); |
| 55 | int level; |
| 56 | |
| 57 | if (value == LED_OFF) |
| 58 | level = 0; |
| 59 | else |
| 60 | level = 1; |
| 61 | |
| 62 | if (led_dat->active_low) |
| 63 | level = !level; |
| 64 | |
David Brownell | 306dd85 | 2008-03-27 00:59:02 +0000 | [diff] [blame] | 65 | /* Setting GPIOs with I2C/etc requires a task context, and we don't |
| 66 | * seem to have a reliable way to know if we're already in one; so |
| 67 | * let's just assume the worst. |
| 68 | */ |
David Brownell | 0085227 | 2007-05-10 10:51:41 +0100 | [diff] [blame] | 69 | if (led_dat->can_sleep) { |
David Brownell | 306dd85 | 2008-03-27 00:59:02 +0000 | [diff] [blame] | 70 | led_dat->new_level = level; |
| 71 | schedule_work(&led_dat->work); |
Benjamin Herrenschmidt | 2146325 | 2010-05-22 20:54:55 +1000 | [diff] [blame] | 72 | } else { |
| 73 | if (led_dat->blinking) { |
| 74 | led_dat->platform_gpio_blink_set(led_dat->gpio, level, |
| 75 | NULL, NULL); |
| 76 | led_dat->blinking = 0; |
| 77 | } else |
| 78 | gpio_set_value(led_dat->gpio, level); |
| 79 | } |
Raphael Assenat | 22e03f3 | 2007-02-27 19:49:53 +0000 | [diff] [blame] | 80 | } |
| 81 | |
Herbert Valerio Riedel | ca3259b | 2008-03-09 23:48:25 +0000 | [diff] [blame] | 82 | static int gpio_blink_set(struct led_classdev *led_cdev, |
| 83 | unsigned long *delay_on, unsigned long *delay_off) |
| 84 | { |
| 85 | struct gpio_led_data *led_dat = |
| 86 | container_of(led_cdev, struct gpio_led_data, cdev); |
| 87 | |
Benjamin Herrenschmidt | 2146325 | 2010-05-22 20:54:55 +1000 | [diff] [blame] | 88 | led_dat->blinking = 1; |
| 89 | return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK, |
| 90 | delay_on, delay_off); |
Herbert Valerio Riedel | ca3259b | 2008-03-09 23:48:25 +0000 | [diff] [blame] | 91 | } |
| 92 | |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 93 | static int __devinit create_gpio_led(const struct gpio_led *template, |
| 94 | struct gpio_led_data *led_dat, struct device *parent, |
Benjamin Herrenschmidt | 2146325 | 2010-05-22 20:54:55 +1000 | [diff] [blame] | 95 | int (*blink_set)(unsigned, int, unsigned long *, unsigned long *)) |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 96 | { |
Trent Piepho | ed88bae | 2009-05-12 15:33:12 -0700 | [diff] [blame] | 97 | int ret, state; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 98 | |
Dmitry Eremin-Solenikov | 0b4634f | 2009-11-16 01:48:32 +0300 | [diff] [blame] | 99 | led_dat->gpio = -1; |
| 100 | |
David Brownell | d379ee8 | 2009-03-05 16:46:44 -0800 | [diff] [blame] | 101 | /* skip leds that aren't available */ |
| 102 | if (!gpio_is_valid(template->gpio)) { |
Michal Simek | 2fea092 | 2009-08-06 16:04:51 -0700 | [diff] [blame] | 103 | printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n", |
David Brownell | d379ee8 | 2009-03-05 16:46:44 -0800 | [diff] [blame] | 104 | template->gpio, template->name); |
David Brownell | ac15e95 | 2009-04-07 17:51:49 -0700 | [diff] [blame] | 105 | return 0; |
David Brownell | d379ee8 | 2009-03-05 16:46:44 -0800 | [diff] [blame] | 106 | } |
| 107 | |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 108 | ret = gpio_request(template->gpio, template->name); |
| 109 | if (ret < 0) |
| 110 | return ret; |
| 111 | |
| 112 | led_dat->cdev.name = template->name; |
| 113 | led_dat->cdev.default_trigger = template->default_trigger; |
| 114 | led_dat->gpio = template->gpio; |
| 115 | led_dat->can_sleep = gpio_cansleep(template->gpio); |
| 116 | led_dat->active_low = template->active_low; |
Benjamin Herrenschmidt | 2146325 | 2010-05-22 20:54:55 +1000 | [diff] [blame] | 117 | led_dat->blinking = 0; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 118 | if (blink_set) { |
| 119 | led_dat->platform_gpio_blink_set = blink_set; |
| 120 | led_dat->cdev.blink_set = gpio_blink_set; |
| 121 | } |
| 122 | led_dat->cdev.brightness_set = gpio_led_set; |
Trent Piepho | ed88bae | 2009-05-12 15:33:12 -0700 | [diff] [blame] | 123 | if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP) |
| 124 | state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low; |
| 125 | else |
| 126 | state = (template->default_state == LEDS_GPIO_DEFSTATE_ON); |
| 127 | led_dat->cdev.brightness = state ? LED_FULL : LED_OFF; |
Richard Purdie | defb512 | 2009-02-17 15:04:07 +0000 | [diff] [blame] | 128 | if (!template->retain_state_suspended) |
| 129 | led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 130 | |
Trent Piepho | ed88bae | 2009-05-12 15:33:12 -0700 | [diff] [blame] | 131 | ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state); |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 132 | if (ret < 0) |
| 133 | goto err; |
Benjamin Herrenschmidt | 2146325 | 2010-05-22 20:54:55 +1000 | [diff] [blame] | 134 | |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 135 | INIT_WORK(&led_dat->work, gpio_led_work); |
| 136 | |
| 137 | ret = led_classdev_register(parent, &led_dat->cdev); |
| 138 | if (ret < 0) |
| 139 | goto err; |
| 140 | |
| 141 | return 0; |
| 142 | err: |
| 143 | gpio_free(led_dat->gpio); |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | static void delete_gpio_led(struct gpio_led_data *led) |
| 148 | { |
David Brownell | d379ee8 | 2009-03-05 16:46:44 -0800 | [diff] [blame] | 149 | if (!gpio_is_valid(led->gpio)) |
| 150 | return; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 151 | led_classdev_unregister(&led->cdev); |
| 152 | cancel_work_sync(&led->work); |
| 153 | gpio_free(led->gpio); |
| 154 | } |
| 155 | |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 156 | struct gpio_leds_priv { |
| 157 | int num_leds; |
| 158 | struct gpio_led_data leds[]; |
Raphael Assenat | 22e03f3 | 2007-02-27 19:49:53 +0000 | [diff] [blame] | 159 | }; |
| 160 | |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 161 | static inline int sizeof_gpio_leds_priv(int num_leds) |
| 162 | { |
| 163 | return sizeof(struct gpio_leds_priv) + |
| 164 | (sizeof(struct gpio_led_data) * num_leds); |
| 165 | } |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 166 | |
| 167 | /* Code to create from OpenFirmware platform devices */ |
Shawn Guo | 2bcc7ed | 2011-05-31 16:23:43 +0800 | [diff] [blame^] | 168 | #ifdef CONFIG_OF_GPIO |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 169 | static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 170 | { |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 171 | struct device_node *np = pdev->dev.of_node, *child; |
| 172 | struct gpio_leds_priv *priv; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 173 | int count = 0, ret; |
| 174 | |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 175 | /* count LEDs in this device, so we know how much to allocate */ |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 176 | for_each_child_of_node(np, child) |
| 177 | count++; |
| 178 | if (!count) |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 179 | return NULL; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 180 | |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 181 | priv = kzalloc(sizeof_gpio_leds_priv(count), GFP_KERNEL); |
| 182 | if (!priv) |
| 183 | return NULL; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 184 | |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 185 | for_each_child_of_node(np, child) { |
Anton Vorontsov | 0493a4f | 2010-03-11 13:58:47 -0800 | [diff] [blame] | 186 | struct gpio_led led = {}; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 187 | enum of_gpio_flags flags; |
Trent Piepho | ed88bae | 2009-05-12 15:33:12 -0700 | [diff] [blame] | 188 | const char *state; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 189 | |
| 190 | led.gpio = of_get_gpio_flags(child, 0, &flags); |
| 191 | led.active_low = flags & OF_GPIO_ACTIVE_LOW; |
| 192 | led.name = of_get_property(child, "label", NULL) ? : child->name; |
| 193 | led.default_trigger = |
| 194 | of_get_property(child, "linux,default-trigger", NULL); |
Trent Piepho | ed88bae | 2009-05-12 15:33:12 -0700 | [diff] [blame] | 195 | state = of_get_property(child, "default-state", NULL); |
| 196 | if (state) { |
| 197 | if (!strcmp(state, "keep")) |
| 198 | led.default_state = LEDS_GPIO_DEFSTATE_KEEP; |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 199 | else if (!strcmp(state, "on")) |
Trent Piepho | ed88bae | 2009-05-12 15:33:12 -0700 | [diff] [blame] | 200 | led.default_state = LEDS_GPIO_DEFSTATE_ON; |
| 201 | else |
| 202 | led.default_state = LEDS_GPIO_DEFSTATE_OFF; |
| 203 | } |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 204 | |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 205 | ret = create_gpio_led(&led, &priv->leds[priv->num_leds++], |
| 206 | &pdev->dev, NULL); |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 207 | if (ret < 0) { |
| 208 | of_node_put(child); |
| 209 | goto err; |
| 210 | } |
| 211 | } |
| 212 | |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 213 | return priv; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 214 | |
| 215 | err: |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 216 | for (count = priv->num_leds - 2; count >= 0; count--) |
| 217 | delete_gpio_led(&priv->leds[count]); |
| 218 | kfree(priv); |
| 219 | return NULL; |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 220 | } |
| 221 | |
| 222 | static const struct of_device_id of_gpio_leds_match[] = { |
| 223 | { .compatible = "gpio-leds", }, |
| 224 | {}, |
| 225 | }; |
Shawn Guo | 2bcc7ed | 2011-05-31 16:23:43 +0800 | [diff] [blame^] | 226 | #else /* CONFIG_OF_GPIO */ |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 227 | static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev) |
| 228 | { |
| 229 | return NULL; |
| 230 | } |
| 231 | #define of_gpio_leds_match NULL |
Shawn Guo | 2bcc7ed | 2011-05-31 16:23:43 +0800 | [diff] [blame^] | 232 | #endif /* CONFIG_OF_GPIO */ |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 233 | |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 234 | |
| 235 | static int __devinit gpio_led_probe(struct platform_device *pdev) |
| 236 | { |
| 237 | struct gpio_led_platform_data *pdata = pdev->dev.platform_data; |
| 238 | struct gpio_leds_priv *priv; |
| 239 | int i, ret = 0; |
| 240 | |
| 241 | if (pdata && pdata->num_leds) { |
| 242 | priv = kzalloc(sizeof_gpio_leds_priv(pdata->num_leds), |
| 243 | GFP_KERNEL); |
| 244 | if (!priv) |
| 245 | return -ENOMEM; |
| 246 | |
| 247 | priv->num_leds = pdata->num_leds; |
| 248 | for (i = 0; i < priv->num_leds; i++) { |
| 249 | ret = create_gpio_led(&pdata->leds[i], |
| 250 | &priv->leds[i], |
| 251 | &pdev->dev, pdata->gpio_blink_set); |
| 252 | if (ret < 0) { |
| 253 | /* On failure: unwind the led creations */ |
| 254 | for (i = i - 1; i >= 0; i--) |
| 255 | delete_gpio_led(&priv->leds[i]); |
| 256 | kfree(priv); |
| 257 | return ret; |
| 258 | } |
| 259 | } |
| 260 | } else { |
| 261 | priv = gpio_leds_create_of(pdev); |
| 262 | if (!priv) |
| 263 | return -ENODEV; |
| 264 | } |
| 265 | |
| 266 | platform_set_drvdata(pdev, priv); |
| 267 | |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | static int __devexit gpio_led_remove(struct platform_device *pdev) |
| 272 | { |
| 273 | struct gpio_leds_priv *priv = dev_get_drvdata(&pdev->dev); |
| 274 | int i; |
| 275 | |
| 276 | for (i = 0; i < priv->num_leds; i++) |
| 277 | delete_gpio_led(&priv->leds[i]); |
| 278 | |
| 279 | dev_set_drvdata(&pdev->dev, NULL); |
| 280 | kfree(priv); |
| 281 | |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | static struct platform_driver gpio_led_driver = { |
| 286 | .probe = gpio_led_probe, |
| 287 | .remove = __devexit_p(gpio_led_remove), |
| 288 | .driver = { |
| 289 | .name = "leds-gpio", |
| 290 | .owner = THIS_MODULE, |
Grant Likely | 4018294 | 2010-04-13 16:13:02 -0700 | [diff] [blame] | 291 | .of_match_table = of_gpio_leds_match, |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 292 | }, |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 293 | }; |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 294 | |
| 295 | MODULE_ALIAS("platform:leds-gpio"); |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 296 | |
Richard Purdie | b2bdc3e | 2009-02-02 23:04:42 +0000 | [diff] [blame] | 297 | static int __init gpio_led_init(void) |
| 298 | { |
Grant Likely | a314c5c | 2011-02-22 20:06:04 -0700 | [diff] [blame] | 299 | return platform_driver_register(&gpio_led_driver); |
Richard Purdie | b2bdc3e | 2009-02-02 23:04:42 +0000 | [diff] [blame] | 300 | } |
| 301 | |
| 302 | static void __exit gpio_led_exit(void) |
| 303 | { |
Richard Purdie | b2bdc3e | 2009-02-02 23:04:42 +0000 | [diff] [blame] | 304 | platform_driver_unregister(&gpio_led_driver); |
Richard Purdie | b2bdc3e | 2009-02-02 23:04:42 +0000 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | module_init(gpio_led_init); |
| 308 | module_exit(gpio_led_exit); |
| 309 | |
Trent Piepho | a7d878a | 2009-01-10 17:26:01 +0000 | [diff] [blame] | 310 | MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>"); |
Raphael Assenat | 22e03f3 | 2007-02-27 19:49:53 +0000 | [diff] [blame] | 311 | MODULE_DESCRIPTION("GPIO LED driver"); |
| 312 | MODULE_LICENSE("GPL"); |