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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>
Sachin Kamatc68f46d2013-09-28 04:38:30 -070018#include <linux/of.h>
Grant Likelya314c5c2011-02-22 20:06:04 -070019#include <linux/of_platform.h>
20#include <linux/of_gpio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
David Brownell00852272007-05-10 10:51:41 +010022#include <linux/workqueue.h>
Paul Gortmaker54f4ded2011-07-03 13:56:03 -040023#include <linux/module.h>
Roland Stigge04553e92012-10-28 08:34:59 -070024#include <linux/err.h>
David Brownell00852272007-05-10 10:51:41 +010025
Raphael Assenat22e03f32007-02-27 19:49:53 +000026struct gpio_led_data {
27 struct led_classdev cdev;
28 unsigned gpio;
David Brownell00852272007-05-10 10:51:41 +010029 struct work_struct work;
30 u8 new_level;
31 u8 can_sleep;
Raphael Assenat22e03f32007-02-27 19:49:53 +000032 u8 active_low;
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +100033 u8 blinking;
34 int (*platform_gpio_blink_set)(unsigned gpio, int state,
Herbert Valerio Riedelca3259b2008-03-09 23:48:25 +000035 unsigned long *delay_on, unsigned long *delay_off);
Raphael Assenat22e03f32007-02-27 19:49:53 +000036};
37
David Brownell00852272007-05-10 10:51:41 +010038static void gpio_led_work(struct work_struct *work)
39{
40 struct gpio_led_data *led_dat =
41 container_of(work, struct gpio_led_data, work);
42
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +100043 if (led_dat->blinking) {
44 led_dat->platform_gpio_blink_set(led_dat->gpio,
45 led_dat->new_level,
46 NULL, NULL);
47 led_dat->blinking = 0;
48 } else
49 gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
David Brownell00852272007-05-10 10:51:41 +010050}
Raphael Assenat22e03f32007-02-27 19:49:53 +000051
52static void gpio_led_set(struct led_classdev *led_cdev,
53 enum led_brightness value)
54{
55 struct gpio_led_data *led_dat =
56 container_of(led_cdev, struct gpio_led_data, cdev);
57 int level;
58
59 if (value == LED_OFF)
60 level = 0;
61 else
62 level = 1;
63
64 if (led_dat->active_low)
65 level = !level;
66
David Brownell306dd852008-03-27 00:59:02 +000067 /* Setting GPIOs with I2C/etc requires a task context, and we don't
68 * seem to have a reliable way to know if we're already in one; so
69 * let's just assume the worst.
70 */
David Brownell00852272007-05-10 10:51:41 +010071 if (led_dat->can_sleep) {
David Brownell306dd852008-03-27 00:59:02 +000072 led_dat->new_level = level;
73 schedule_work(&led_dat->work);
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +100074 } else {
75 if (led_dat->blinking) {
76 led_dat->platform_gpio_blink_set(led_dat->gpio, level,
77 NULL, NULL);
78 led_dat->blinking = 0;
79 } else
80 gpio_set_value(led_dat->gpio, level);
81 }
Raphael Assenat22e03f32007-02-27 19:49:53 +000082}
83
Herbert Valerio Riedelca3259b2008-03-09 23:48:25 +000084static int gpio_blink_set(struct led_classdev *led_cdev,
85 unsigned long *delay_on, unsigned long *delay_off)
86{
87 struct gpio_led_data *led_dat =
88 container_of(led_cdev, struct gpio_led_data, cdev);
89
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +100090 led_dat->blinking = 1;
91 return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK,
92 delay_on, delay_off);
Herbert Valerio Riedelca3259b2008-03-09 23:48:25 +000093}
94
Bill Pemberton98ea1ea2012-11-19 13:23:02 -050095static int create_gpio_led(const struct gpio_led *template,
Trent Piephoa7d878a2009-01-10 17:26:01 +000096 struct gpio_led_data *led_dat, struct device *parent,
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +100097 int (*blink_set)(unsigned, int, unsigned long *, unsigned long *))
Trent Piephoa7d878a2009-01-10 17:26:01 +000098{
Trent Piephoed88bae2009-05-12 15:33:12 -070099 int ret, state;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000100
Dmitry Eremin-Solenikov0b4634f2009-11-16 01:48:32 +0300101 led_dat->gpio = -1;
102
David Brownelld379ee82009-03-05 16:46:44 -0800103 /* skip leds that aren't available */
104 if (!gpio_is_valid(template->gpio)) {
Sachin Kamat39de81a2012-11-25 11:38:05 +0530105 dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n",
David Brownelld379ee82009-03-05 16:46:44 -0800106 template->gpio, template->name);
David Brownellac15e952009-04-07 17:51:49 -0700107 return 0;
David Brownelld379ee82009-03-05 16:46:44 -0800108 }
109
Timo Teräs803d19d2013-05-17 00:48:39 -0700110 ret = devm_gpio_request(parent, template->gpio, template->name);
111 if (ret < 0)
112 return ret;
113
Trent Piephoa7d878a2009-01-10 17:26:01 +0000114 led_dat->cdev.name = template->name;
115 led_dat->cdev.default_trigger = template->default_trigger;
116 led_dat->gpio = template->gpio;
117 led_dat->can_sleep = gpio_cansleep(template->gpio);
118 led_dat->active_low = template->active_low;
Benjamin Herrenschmidt21463252010-05-22 20:54:55 +1000119 led_dat->blinking = 0;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000120 if (blink_set) {
121 led_dat->platform_gpio_blink_set = blink_set;
122 led_dat->cdev.blink_set = gpio_blink_set;
123 }
124 led_dat->cdev.brightness_set = gpio_led_set;
Trent Piephoed88bae2009-05-12 15:33:12 -0700125 if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
David Daneydabc69c2011-10-31 17:12:17 -0700126 state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low;
Trent Piephoed88bae2009-05-12 15:33:12 -0700127 else
128 state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
129 led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
Richard Purdiedefb5122009-02-17 15:04:07 +0000130 if (!template->retain_state_suspended)
131 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000132
Timo Teräs803d19d2013-05-17 00:48:39 -0700133 ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000134 if (ret < 0)
Jingoo Hana99d76f2012-10-23 05:17:11 -0700135 return ret;
136
Trent Piephoa7d878a2009-01-10 17:26:01 +0000137 INIT_WORK(&led_dat->work, gpio_led_work);
138
139 ret = led_classdev_register(parent, &led_dat->cdev);
140 if (ret < 0)
Sachin Kamate3b1d442012-11-25 10:10:20 +0530141 return ret;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000142
143 return 0;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000144}
145
146static void delete_gpio_led(struct gpio_led_data *led)
147{
David Brownelld379ee82009-03-05 16:46:44 -0800148 if (!gpio_is_valid(led->gpio))
149 return;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000150 led_classdev_unregister(&led->cdev);
151 cancel_work_sync(&led->work);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000152}
153
Grant Likelya314c5c2011-02-22 20:06:04 -0700154struct gpio_leds_priv {
155 int num_leds;
156 struct gpio_led_data leds[];
Raphael Assenat22e03f32007-02-27 19:49:53 +0000157};
158
Grant Likelya314c5c2011-02-22 20:06:04 -0700159static inline int sizeof_gpio_leds_priv(int num_leds)
160{
161 return sizeof(struct gpio_leds_priv) +
162 (sizeof(struct gpio_led_data) * num_leds);
163}
Trent Piephoa7d878a2009-01-10 17:26:01 +0000164
165/* Code to create from OpenFirmware platform devices */
Shawn Guo2bcc7ed2011-05-31 16:23:43 +0800166#ifdef CONFIG_OF_GPIO
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500167static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev)
Trent Piephoa7d878a2009-01-10 17:26:01 +0000168{
Grant Likelya314c5c2011-02-22 20:06:04 -0700169 struct device_node *np = pdev->dev.of_node, *child;
170 struct gpio_leds_priv *priv;
Tobias Klauser127aedc2012-08-21 17:21:53 +0800171 int count, ret;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000172
Grant Likelya314c5c2011-02-22 20:06:04 -0700173 /* count LEDs in this device, so we know how much to allocate */
Josh Wub0bb83d2013-09-26 04:27:56 -0700174 count = of_get_available_child_count(np);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000175 if (!count)
Roland Stigge04553e92012-10-28 08:34:59 -0700176 return ERR_PTR(-ENODEV);
177
Josh Wub0bb83d2013-09-26 04:27:56 -0700178 for_each_available_child_of_node(np, child)
Roland Stigge04553e92012-10-28 08:34:59 -0700179 if (of_get_gpio(child, 0) == -EPROBE_DEFER)
180 return ERR_PTR(-EPROBE_DEFER);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000181
Sachin Kamat198b8612012-07-04 11:35:44 +0800182 priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count),
183 GFP_KERNEL);
Grant Likelya314c5c2011-02-22 20:06:04 -0700184 if (!priv)
Roland Stigge04553e92012-10-28 08:34:59 -0700185 return ERR_PTR(-ENOMEM);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000186
Josh Wub0bb83d2013-09-26 04:27:56 -0700187 for_each_available_child_of_node(np, child) {
Anton Vorontsov0493a4f2010-03-11 13:58:47 -0800188 struct gpio_led led = {};
Trent Piephoa7d878a2009-01-10 17:26:01 +0000189 enum of_gpio_flags flags;
Trent Piephoed88bae2009-05-12 15:33:12 -0700190 const char *state;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000191
192 led.gpio = of_get_gpio_flags(child, 0, &flags);
193 led.active_low = flags & OF_GPIO_ACTIVE_LOW;
194 led.name = of_get_property(child, "label", NULL) ? : child->name;
195 led.default_trigger =
196 of_get_property(child, "linux,default-trigger", NULL);
Trent Piephoed88bae2009-05-12 15:33:12 -0700197 state = of_get_property(child, "default-state", NULL);
198 if (state) {
199 if (!strcmp(state, "keep"))
200 led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
Grant Likelya314c5c2011-02-22 20:06:04 -0700201 else if (!strcmp(state, "on"))
Trent Piephoed88bae2009-05-12 15:33:12 -0700202 led.default_state = LEDS_GPIO_DEFSTATE_ON;
203 else
204 led.default_state = LEDS_GPIO_DEFSTATE_OFF;
205 }
Trent Piephoa7d878a2009-01-10 17:26:01 +0000206
Grant Likelya314c5c2011-02-22 20:06:04 -0700207 ret = create_gpio_led(&led, &priv->leds[priv->num_leds++],
208 &pdev->dev, NULL);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000209 if (ret < 0) {
210 of_node_put(child);
211 goto err;
212 }
213 }
214
Grant Likelya314c5c2011-02-22 20:06:04 -0700215 return priv;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000216
217err:
Grant Likelya314c5c2011-02-22 20:06:04 -0700218 for (count = priv->num_leds - 2; count >= 0; count--)
219 delete_gpio_led(&priv->leds[count]);
Roland Stigge04553e92012-10-28 08:34:59 -0700220 return ERR_PTR(-ENODEV);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000221}
222
223static const struct of_device_id of_gpio_leds_match[] = {
224 { .compatible = "gpio-leds", },
225 {},
226};
Shawn Guo2bcc7ed2011-05-31 16:23:43 +0800227#else /* CONFIG_OF_GPIO */
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500228static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev)
Grant Likelya314c5c2011-02-22 20:06:04 -0700229{
Roland Stigge04553e92012-10-28 08:34:59 -0700230 return ERR_PTR(-ENODEV);
Grant Likelya314c5c2011-02-22 20:06:04 -0700231}
Shawn Guo2bcc7ed2011-05-31 16:23:43 +0800232#endif /* CONFIG_OF_GPIO */
Trent Piephoa7d878a2009-01-10 17:26:01 +0000233
Grant Likelya314c5c2011-02-22 20:06:04 -0700234
Bill Pemberton98ea1ea2012-11-19 13:23:02 -0500235static int gpio_led_probe(struct platform_device *pdev)
Grant Likelya314c5c2011-02-22 20:06:04 -0700236{
Jingoo Han87aae1e2013-07-30 01:07:35 -0700237 struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
Grant Likelya314c5c2011-02-22 20:06:04 -0700238 struct gpio_leds_priv *priv;
239 int i, ret = 0;
240
AnilKumar Ch8fe45542012-09-01 16:16:30 +0800241
Grant Likelya314c5c2011-02-22 20:06:04 -0700242 if (pdata && pdata->num_leds) {
Sachin Kamat198b8612012-07-04 11:35:44 +0800243 priv = devm_kzalloc(&pdev->dev,
244 sizeof_gpio_leds_priv(pdata->num_leds),
245 GFP_KERNEL);
Grant Likelya314c5c2011-02-22 20:06:04 -0700246 if (!priv)
247 return -ENOMEM;
248
249 priv->num_leds = pdata->num_leds;
250 for (i = 0; i < priv->num_leds; i++) {
251 ret = create_gpio_led(&pdata->leds[i],
252 &priv->leds[i],
253 &pdev->dev, pdata->gpio_blink_set);
254 if (ret < 0) {
255 /* On failure: unwind the led creations */
256 for (i = i - 1; i >= 0; i--)
257 delete_gpio_led(&priv->leds[i]);
Grant Likelya314c5c2011-02-22 20:06:04 -0700258 return ret;
259 }
260 }
261 } else {
262 priv = gpio_leds_create_of(pdev);
Roland Stigge04553e92012-10-28 08:34:59 -0700263 if (IS_ERR(priv))
264 return PTR_ERR(priv);
Grant Likelya314c5c2011-02-22 20:06:04 -0700265 }
266
267 platform_set_drvdata(pdev, priv);
268
269 return 0;
270}
271
Bill Pemberton678e8a62012-11-19 13:26:00 -0500272static int gpio_led_remove(struct platform_device *pdev)
Grant Likelya314c5c2011-02-22 20:06:04 -0700273{
Tobias Klauser59c4dce2012-08-16 18:36:13 +0800274 struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
Grant Likelya314c5c2011-02-22 20:06:04 -0700275 int i;
276
277 for (i = 0; i < priv->num_leds; i++)
278 delete_gpio_led(&priv->leds[i]);
279
Grant Likelya314c5c2011-02-22 20:06:04 -0700280 return 0;
281}
282
283static struct platform_driver gpio_led_driver = {
284 .probe = gpio_led_probe,
Bill Pembertondf07cf82012-11-19 13:20:20 -0500285 .remove = gpio_led_remove,
Grant Likelya314c5c2011-02-22 20:06:04 -0700286 .driver = {
287 .name = "leds-gpio",
288 .owner = THIS_MODULE,
Tobias Klauser6ebcebd2012-08-16 18:35:36 +0800289 .of_match_table = of_match_ptr(of_gpio_leds_match),
Trent Piephoa7d878a2009-01-10 17:26:01 +0000290 },
Trent Piephoa7d878a2009-01-10 17:26:01 +0000291};
Grant Likelya314c5c2011-02-22 20:06:04 -0700292
Axel Lin892a8842012-01-10 15:09:24 -0800293module_platform_driver(gpio_led_driver);
Richard Purdieb2bdc3e2009-02-02 23:04:42 +0000294
Trent Piephoa7d878a2009-01-10 17:26:01 +0000295MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
Raphael Assenat22e03f32007-02-27 19:49:53 +0000296MODULE_DESCRIPTION("GPIO LED driver");
297MODULE_LICENSE("GPL");
Axel Lin892a8842012-01-10 15:09:24 -0800298MODULE_ALIAS("platform:leds-gpio");