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Raphael Assenat22e03f32007-02-27 19:49:53 +00001/*
2 * LEDs driver for GPIOs
3 *
4 * Copyright (C) 2007 8D Technologies inc.
5 * Raphael Assenat <raph@8d.com>
Trent Piephoa7d878a2009-01-10 17:26:01 +00006 * Copyright (C) 2008 Freescale Semiconductor, Inc.
Raphael Assenat22e03f32007-02-27 19:49:53 +00007 *
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>
Mark Brown16db7f92012-03-23 15:02:11 -070016#include <linux/gpio.h>
Raphael Assenat22e03f32007-02-27 19:49:53 +000017#include <linux/leds.h>
Grant Likelya314c5c2011-02-22 20:06:04 -070018#include <linux/of_platform.h>
19#include <linux/of_gpio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
David Brownell00852272007-05-10 10:51:41 +010021#include <linux/workqueue.h>
Paul Gortmaker54f4ded2011-07-03 13:56:03 -040022#include <linux/module.h>
Roland Stigge04553e92012-10-28 08:34:59 -070023#include <linux/err.h>
David Brownell00852272007-05-10 10:51:41 +010024
Raphael Assenat22e03f32007-02-27 19:49:53 +000025struct gpio_led_data {
26 struct led_classdev cdev;
27 unsigned gpio;
David Brownell00852272007-05-10 10:51:41 +010028 struct work_struct work;
29 u8 new_level;
30 u8 can_sleep;
Raphael Assenat22e03f32007-02-27 19:49:53 +000031 u8 active_low;
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +100032 u8 blinking;
33 int (*platform_gpio_blink_set)(unsigned gpio, int state,
Herbert Valerio Riedelca3259b2008-03-09 23:48:25 +000034 unsigned long *delay_on, unsigned long *delay_off);
Raphael Assenat22e03f32007-02-27 19:49:53 +000035};
36
David Brownell00852272007-05-10 10:51:41 +010037static void gpio_led_work(struct work_struct *work)
38{
39 struct gpio_led_data *led_dat =
40 container_of(work, struct gpio_led_data, work);
41
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +100042 if (led_dat->blinking) {
43 led_dat->platform_gpio_blink_set(led_dat->gpio,
44 led_dat->new_level,
45 NULL, NULL);
46 led_dat->blinking = 0;
47 } else
48 gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
David Brownell00852272007-05-10 10:51:41 +010049}
Raphael Assenat22e03f32007-02-27 19:49:53 +000050
51static void gpio_led_set(struct led_classdev *led_cdev,
52 enum led_brightness value)
53{
54 struct gpio_led_data *led_dat =
55 container_of(led_cdev, struct gpio_led_data, cdev);
56 int level;
57
58 if (value == LED_OFF)
59 level = 0;
60 else
61 level = 1;
62
63 if (led_dat->active_low)
64 level = !level;
65
David Brownell306dd852008-03-27 00:59:02 +000066 /* Setting GPIOs with I2C/etc requires a task context, and we don't
67 * seem to have a reliable way to know if we're already in one; so
68 * let's just assume the worst.
69 */
David Brownell00852272007-05-10 10:51:41 +010070 if (led_dat->can_sleep) {
David Brownell306dd852008-03-27 00:59:02 +000071 led_dat->new_level = level;
72 schedule_work(&led_dat->work);
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +100073 } else {
74 if (led_dat->blinking) {
75 led_dat->platform_gpio_blink_set(led_dat->gpio, level,
76 NULL, NULL);
77 led_dat->blinking = 0;
78 } else
79 gpio_set_value(led_dat->gpio, level);
80 }
Raphael Assenat22e03f32007-02-27 19:49:53 +000081}
82
Herbert Valerio Riedelca3259b2008-03-09 23:48:25 +000083static int gpio_blink_set(struct led_classdev *led_cdev,
84 unsigned long *delay_on, unsigned long *delay_off)
85{
86 struct gpio_led_data *led_dat =
87 container_of(led_cdev, struct gpio_led_data, cdev);
88
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +100089 led_dat->blinking = 1;
90 return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK,
91 delay_on, delay_off);
Herbert Valerio Riedelca3259b2008-03-09 23:48:25 +000092}
93
Bill Pemberton98ea1ea2012-11-19 13:23:02 -050094static int create_gpio_led(const struct gpio_led *template,
Trent Piephoa7d878a2009-01-10 17:26:01 +000095 struct gpio_led_data *led_dat, struct device *parent,
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +100096 int (*blink_set)(unsigned, int, unsigned long *, unsigned long *))
Trent Piephoa7d878a2009-01-10 17:26:01 +000097{
Trent Piephoed88bae2009-05-12 15:33:12 -070098 int ret, state;
Trent Piephoa7d878a2009-01-10 17:26:01 +000099
Dmitry Eremin-Solenikov0b4634f2009-11-16 01:48:32 +0300100 led_dat->gpio = -1;
101
David Brownelld379ee82009-03-05 16:46:44 -0800102 /* skip leds that aren't available */
103 if (!gpio_is_valid(template->gpio)) {
Sachin Kamat39de81a2012-11-25 11:38:05 +0530104 dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n",
David Brownelld379ee82009-03-05 16:46:44 -0800105 template->gpio, template->name);
David Brownellac15e952009-04-07 17:51:49 -0700106 return 0;
David Brownelld379ee82009-03-05 16:46:44 -0800107 }
108
Timo Teräs803d19d2013-05-17 00:48:39 -0700109 ret = devm_gpio_request(parent, template->gpio, template->name);
110 if (ret < 0)
111 return ret;
112
Trent Piephoa7d878a2009-01-10 17:26:01 +0000113 led_dat->cdev.name = template->name;
114 led_dat->cdev.default_trigger = template->default_trigger;
115 led_dat->gpio = template->gpio;
116 led_dat->can_sleep = gpio_cansleep(template->gpio);
117 led_dat->active_low = template->active_low;
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +1000118 led_dat->blinking = 0;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000119 if (blink_set) {
120 led_dat->platform_gpio_blink_set = blink_set;
121 led_dat->cdev.blink_set = gpio_blink_set;
122 }
123 led_dat->cdev.brightness_set = gpio_led_set;
Trent Piephoed88bae2009-05-12 15:33:12 -0700124 if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
David Daneydabc69c2011-10-31 17:12:17 -0700125 state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low;
Trent Piephoed88bae2009-05-12 15:33:12 -0700126 else
127 state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
128 led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
Richard Purdiedefb5122009-02-17 15:04:07 +0000129 if (!template->retain_state_suspended)
130 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000131
Timo Teräs803d19d2013-05-17 00:48:39 -0700132 ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000133 if (ret < 0)
Jingoo Hana99d76f2012-10-23 05:17:11 -0700134 return ret;
135
Trent Piephoa7d878a2009-01-10 17:26:01 +0000136 INIT_WORK(&led_dat->work, gpio_led_work);
137
138 ret = led_classdev_register(parent, &led_dat->cdev);
139 if (ret < 0)
Sachin Kamate3b1d442012-11-25 10:10:20 +0530140 return ret;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000141
142 return 0;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000143}
144
145static void delete_gpio_led(struct gpio_led_data *led)
146{
David Brownelld379ee82009-03-05 16:46:44 -0800147 if (!gpio_is_valid(led->gpio))
148 return;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000149 led_classdev_unregister(&led->cdev);
150 cancel_work_sync(&led->work);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000151}
152
Grant Likelya314c5c2011-02-22 20:06:04 -0700153struct gpio_leds_priv {
154 int num_leds;
155 struct gpio_led_data leds[];
Raphael Assenat22e03f32007-02-27 19:49:53 +0000156};
157
Grant Likelya314c5c2011-02-22 20:06:04 -0700158static inline int sizeof_gpio_leds_priv(int num_leds)
159{
160 return sizeof(struct gpio_leds_priv) +
161 (sizeof(struct gpio_led_data) * num_leds);
162}
Trent Piephoa7d878a2009-01-10 17:26:01 +0000163
164/* Code to create from OpenFirmware platform devices */
Shawn Guo2bcc7ed2011-05-31 16:23:43 +0800165#ifdef CONFIG_OF_GPIO
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500166static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev)
Trent Piephoa7d878a2009-01-10 17:26:01 +0000167{
Grant Likelya314c5c2011-02-22 20:06:04 -0700168 struct device_node *np = pdev->dev.of_node, *child;
169 struct gpio_leds_priv *priv;
Tobias Klauser127aedc2012-08-21 17:21:53 +0800170 int count, ret;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000171
Grant Likelya314c5c2011-02-22 20:06:04 -0700172 /* count LEDs in this device, so we know how much to allocate */
Tobias Klauser127aedc2012-08-21 17:21:53 +0800173 count = of_get_child_count(np);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000174 if (!count)
Roland Stigge04553e92012-10-28 08:34:59 -0700175 return ERR_PTR(-ENODEV);
176
177 for_each_child_of_node(np, child)
178 if (of_get_gpio(child, 0) == -EPROBE_DEFER)
179 return ERR_PTR(-EPROBE_DEFER);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000180
Sachin Kamat198b8612012-07-04 11:35:44 +0800181 priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count),
182 GFP_KERNEL);
Grant Likelya314c5c2011-02-22 20:06:04 -0700183 if (!priv)
Roland Stigge04553e92012-10-28 08:34:59 -0700184 return ERR_PTR(-ENOMEM);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000185
Trent Piephoa7d878a2009-01-10 17:26:01 +0000186 for_each_child_of_node(np, child) {
Anton Vorontsov0493a4f2010-03-11 13:58:47 -0800187 struct gpio_led led = {};
Trent Piephoa7d878a2009-01-10 17:26:01 +0000188 enum of_gpio_flags flags;
Trent Piephoed88bae2009-05-12 15:33:12 -0700189 const char *state;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000190
191 led.gpio = of_get_gpio_flags(child, 0, &flags);
192 led.active_low = flags & OF_GPIO_ACTIVE_LOW;
193 led.name = of_get_property(child, "label", NULL) ? : child->name;
194 led.default_trigger =
195 of_get_property(child, "linux,default-trigger", NULL);
Trent Piephoed88bae2009-05-12 15:33:12 -0700196 state = of_get_property(child, "default-state", NULL);
197 if (state) {
198 if (!strcmp(state, "keep"))
199 led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
Grant Likelya314c5c2011-02-22 20:06:04 -0700200 else if (!strcmp(state, "on"))
Trent Piephoed88bae2009-05-12 15:33:12 -0700201 led.default_state = LEDS_GPIO_DEFSTATE_ON;
202 else
203 led.default_state = LEDS_GPIO_DEFSTATE_OFF;
204 }
Trent Piephoa7d878a2009-01-10 17:26:01 +0000205
Grant Likelya314c5c2011-02-22 20:06:04 -0700206 ret = create_gpio_led(&led, &priv->leds[priv->num_leds++],
207 &pdev->dev, NULL);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000208 if (ret < 0) {
209 of_node_put(child);
210 goto err;
211 }
212 }
213
Grant Likelya314c5c2011-02-22 20:06:04 -0700214 return priv;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000215
216err:
Grant Likelya314c5c2011-02-22 20:06:04 -0700217 for (count = priv->num_leds - 2; count >= 0; count--)
218 delete_gpio_led(&priv->leds[count]);
Roland Stigge04553e92012-10-28 08:34:59 -0700219 return ERR_PTR(-ENODEV);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000220}
221
222static const struct of_device_id of_gpio_leds_match[] = {
223 { .compatible = "gpio-leds", },
224 {},
225};
Shawn Guo2bcc7ed2011-05-31 16:23:43 +0800226#else /* CONFIG_OF_GPIO */
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500227static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev)
Grant Likelya314c5c2011-02-22 20:06:04 -0700228{
Roland Stigge04553e92012-10-28 08:34:59 -0700229 return ERR_PTR(-ENODEV);
Grant Likelya314c5c2011-02-22 20:06:04 -0700230}
Shawn Guo2bcc7ed2011-05-31 16:23:43 +0800231#endif /* CONFIG_OF_GPIO */
Trent Piephoa7d878a2009-01-10 17:26:01 +0000232
Grant Likelya314c5c2011-02-22 20:06:04 -0700233
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500234static int gpio_led_probe(struct platform_device *pdev)
Grant Likelya314c5c2011-02-22 20:06:04 -0700235{
Jingoo Han87aae1e2013-07-30 01:07:35 -0700236 struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
Grant Likelya314c5c2011-02-22 20:06:04 -0700237 struct gpio_leds_priv *priv;
238 int i, ret = 0;
239
AnilKumar Ch8fe45542012-09-01 16:16:30 +0800240
Grant Likelya314c5c2011-02-22 20:06:04 -0700241 if (pdata && pdata->num_leds) {
Sachin Kamat198b8612012-07-04 11:35:44 +0800242 priv = devm_kzalloc(&pdev->dev,
243 sizeof_gpio_leds_priv(pdata->num_leds),
244 GFP_KERNEL);
Grant Likelya314c5c2011-02-22 20:06:04 -0700245 if (!priv)
246 return -ENOMEM;
247
248 priv->num_leds = pdata->num_leds;
249 for (i = 0; i < priv->num_leds; i++) {
250 ret = create_gpio_led(&pdata->leds[i],
251 &priv->leds[i],
252 &pdev->dev, pdata->gpio_blink_set);
253 if (ret < 0) {
254 /* On failure: unwind the led creations */
255 for (i = i - 1; i >= 0; i--)
256 delete_gpio_led(&priv->leds[i]);
Grant Likelya314c5c2011-02-22 20:06:04 -0700257 return ret;
258 }
259 }
260 } else {
261 priv = gpio_leds_create_of(pdev);
Roland Stigge04553e92012-10-28 08:34:59 -0700262 if (IS_ERR(priv))
263 return PTR_ERR(priv);
Grant Likelya314c5c2011-02-22 20:06:04 -0700264 }
265
266 platform_set_drvdata(pdev, priv);
267
268 return 0;
269}
270
Bill Pemberton678e8a62012-11-19 13:26:00 -0500271static int gpio_led_remove(struct platform_device *pdev)
Grant Likelya314c5c2011-02-22 20:06:04 -0700272{
Tobias Klauser59c4dce2012-08-16 18:36:13 +0800273 struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
Grant Likelya314c5c2011-02-22 20:06:04 -0700274 int i;
275
276 for (i = 0; i < priv->num_leds; i++)
277 delete_gpio_led(&priv->leds[i]);
278
Grant Likelya314c5c2011-02-22 20:06:04 -0700279 return 0;
280}
281
282static struct platform_driver gpio_led_driver = {
283 .probe = gpio_led_probe,
Bill Pembertondf07cf82012-11-19 13:20:20 -0500284 .remove = gpio_led_remove,
Grant Likelya314c5c2011-02-22 20:06:04 -0700285 .driver = {
286 .name = "leds-gpio",
287 .owner = THIS_MODULE,
Tobias Klauser6ebcebd2012-08-16 18:35:36 +0800288 .of_match_table = of_match_ptr(of_gpio_leds_match),
Trent Piephoa7d878a2009-01-10 17:26:01 +0000289 },
Trent Piephoa7d878a2009-01-10 17:26:01 +0000290};
Grant Likelya314c5c2011-02-22 20:06:04 -0700291
Axel Lin892a8842012-01-10 15:09:24 -0800292module_platform_driver(gpio_led_driver);
Richard Purdieb2bdc3e2009-02-02 23:04:42 +0000293
Trent Piephoa7d878a2009-01-10 17:26:01 +0000294MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
Raphael Assenat22e03f32007-02-27 19:49:53 +0000295MODULE_DESCRIPTION("GPIO LED driver");
296MODULE_LICENSE("GPL");
Axel Lin892a8842012-01-10 15:09:24 -0800297MODULE_ALIAS("platform:leds-gpio");