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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>
16#include <linux/leds.h>
David Brownell00852272007-05-10 10:51:41 +010017#include <linux/workqueue.h>
18
Raphael Assenat22e03f32007-02-27 19:49:53 +000019#include <asm/gpio.h>
20
21struct gpio_led_data {
22 struct led_classdev cdev;
23 unsigned gpio;
David Brownell00852272007-05-10 10:51:41 +010024 struct work_struct work;
25 u8 new_level;
26 u8 can_sleep;
Raphael Assenat22e03f32007-02-27 19:49:53 +000027 u8 active_low;
Herbert Valerio Riedelca3259b2008-03-09 23:48:25 +000028 int (*platform_gpio_blink_set)(unsigned gpio,
29 unsigned long *delay_on, unsigned long *delay_off);
Raphael Assenat22e03f32007-02-27 19:49:53 +000030};
31
David Brownell00852272007-05-10 10:51:41 +010032static void gpio_led_work(struct work_struct *work)
33{
34 struct gpio_led_data *led_dat =
35 container_of(work, struct gpio_led_data, work);
36
37 gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
38}
Raphael Assenat22e03f32007-02-27 19:49:53 +000039
40static void gpio_led_set(struct led_classdev *led_cdev,
41 enum led_brightness value)
42{
43 struct gpio_led_data *led_dat =
44 container_of(led_cdev, struct gpio_led_data, cdev);
45 int level;
46
47 if (value == LED_OFF)
48 level = 0;
49 else
50 level = 1;
51
52 if (led_dat->active_low)
53 level = !level;
54
David Brownell306dd852008-03-27 00:59:02 +000055 /* Setting GPIOs with I2C/etc requires a task context, and we don't
56 * seem to have a reliable way to know if we're already in one; so
57 * let's just assume the worst.
58 */
David Brownell00852272007-05-10 10:51:41 +010059 if (led_dat->can_sleep) {
David Brownell306dd852008-03-27 00:59:02 +000060 led_dat->new_level = level;
61 schedule_work(&led_dat->work);
David Brownell00852272007-05-10 10:51:41 +010062 } else
63 gpio_set_value(led_dat->gpio, level);
Raphael Assenat22e03f32007-02-27 19:49:53 +000064}
65
Herbert Valerio Riedelca3259b2008-03-09 23:48:25 +000066static int gpio_blink_set(struct led_classdev *led_cdev,
67 unsigned long *delay_on, unsigned long *delay_off)
68{
69 struct gpio_led_data *led_dat =
70 container_of(led_cdev, struct gpio_led_data, cdev);
71
72 return led_dat->platform_gpio_blink_set(led_dat->gpio, delay_on, delay_off);
73}
74
Trent Piephoa7d878a2009-01-10 17:26:01 +000075static int __devinit create_gpio_led(const struct gpio_led *template,
76 struct gpio_led_data *led_dat, struct device *parent,
77 int (*blink_set)(unsigned, unsigned long *, unsigned long *))
78{
Trent Piephoed88bae2009-05-12 15:33:12 -070079 int ret, state;
Trent Piephoa7d878a2009-01-10 17:26:01 +000080
David Brownelld379ee82009-03-05 16:46:44 -080081 /* skip leds that aren't available */
82 if (!gpio_is_valid(template->gpio)) {
83 printk(KERN_INFO "Skipping unavilable LED gpio %d (%s)\n",
84 template->gpio, template->name);
David Brownellac15e952009-04-07 17:51:49 -070085 return 0;
David Brownelld379ee82009-03-05 16:46:44 -080086 }
87
Trent Piephoa7d878a2009-01-10 17:26:01 +000088 ret = gpio_request(template->gpio, template->name);
89 if (ret < 0)
90 return ret;
91
92 led_dat->cdev.name = template->name;
93 led_dat->cdev.default_trigger = template->default_trigger;
94 led_dat->gpio = template->gpio;
95 led_dat->can_sleep = gpio_cansleep(template->gpio);
96 led_dat->active_low = template->active_low;
97 if (blink_set) {
98 led_dat->platform_gpio_blink_set = blink_set;
99 led_dat->cdev.blink_set = gpio_blink_set;
100 }
101 led_dat->cdev.brightness_set = gpio_led_set;
Trent Piephoed88bae2009-05-12 15:33:12 -0700102 if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
103 state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low;
104 else
105 state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
106 led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
Richard Purdiedefb5122009-02-17 15:04:07 +0000107 if (!template->retain_state_suspended)
108 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000109
Trent Piephoed88bae2009-05-12 15:33:12 -0700110 ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000111 if (ret < 0)
112 goto err;
113
114 INIT_WORK(&led_dat->work, gpio_led_work);
115
116 ret = led_classdev_register(parent, &led_dat->cdev);
117 if (ret < 0)
118 goto err;
119
120 return 0;
121err:
122 gpio_free(led_dat->gpio);
123 return ret;
124}
125
126static void delete_gpio_led(struct gpio_led_data *led)
127{
David Brownelld379ee82009-03-05 16:46:44 -0800128 if (!gpio_is_valid(led->gpio))
129 return;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000130 led_classdev_unregister(&led->cdev);
131 cancel_work_sync(&led->work);
132 gpio_free(led->gpio);
133}
134
135#ifdef CONFIG_LEDS_GPIO_PLATFORM
Zhenwen Xu7fd02172009-06-10 12:48:51 -0700136static int __devinit gpio_led_probe(struct platform_device *pdev)
Raphael Assenat22e03f32007-02-27 19:49:53 +0000137{
138 struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000139 struct gpio_led_data *leds_data;
Raphael Assenat22e03f32007-02-27 19:49:53 +0000140 int i, ret = 0;
141
142 if (!pdata)
143 return -EBUSY;
144
145 leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds,
146 GFP_KERNEL);
147 if (!leds_data)
148 return -ENOMEM;
149
150 for (i = 0; i < pdata->num_leds; i++) {
Trent Piephoa7d878a2009-01-10 17:26:01 +0000151 ret = create_gpio_led(&pdata->leds[i], &leds_data[i],
152 &pdev->dev, pdata->gpio_blink_set);
Uwe Kleine-Königd95cbe62008-03-09 20:42:27 +0000153 if (ret < 0)
154 goto err;
Raphael Assenat22e03f32007-02-27 19:49:53 +0000155 }
156
157 platform_set_drvdata(pdev, leds_data);
158
159 return 0;
160
161err:
Trent Piephoa7d878a2009-01-10 17:26:01 +0000162 for (i = i - 1; i >= 0; i--)
163 delete_gpio_led(&leds_data[i]);
David Brownell00852272007-05-10 10:51:41 +0100164
Raphael Assenat22e03f32007-02-27 19:49:53 +0000165 kfree(leds_data);
166
167 return ret;
168}
169
David Brownell199fb212007-10-31 10:37:37 +0100170static int __devexit gpio_led_remove(struct platform_device *pdev)
Raphael Assenat22e03f32007-02-27 19:49:53 +0000171{
172 int i;
173 struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
174 struct gpio_led_data *leds_data;
175
176 leds_data = platform_get_drvdata(pdev);
177
Trent Piephoa7d878a2009-01-10 17:26:01 +0000178 for (i = 0; i < pdata->num_leds; i++)
179 delete_gpio_led(&leds_data[i]);
David Brownell199fb212007-10-31 10:37:37 +0100180
Raphael Assenat22e03f32007-02-27 19:49:53 +0000181 kfree(leds_data);
182
183 return 0;
184}
185
Raphael Assenat22e03f32007-02-27 19:49:53 +0000186static struct platform_driver gpio_led_driver = {
David Brownell199fb212007-10-31 10:37:37 +0100187 .probe = gpio_led_probe,
188 .remove = __devexit_p(gpio_led_remove),
Raphael Assenat22e03f32007-02-27 19:49:53 +0000189 .driver = {
190 .name = "leds-gpio",
191 .owner = THIS_MODULE,
192 },
193};
194
Trent Piephoa7d878a2009-01-10 17:26:01 +0000195MODULE_ALIAS("platform:leds-gpio");
196#endif /* CONFIG_LEDS_GPIO_PLATFORM */
197
198/* Code to create from OpenFirmware platform devices */
199#ifdef CONFIG_LEDS_GPIO_OF
200#include <linux/of_platform.h>
201#include <linux/of_gpio.h>
202
203struct gpio_led_of_platform_data {
204 int num_leds;
205 struct gpio_led_data led_data[];
206};
207
208static int __devinit of_gpio_leds_probe(struct of_device *ofdev,
209 const struct of_device_id *match)
210{
211 struct device_node *np = ofdev->node, *child;
212 struct gpio_led led;
213 struct gpio_led_of_platform_data *pdata;
214 int count = 0, ret;
215
216 /* count LEDs defined by this device, so we know how much to allocate */
217 for_each_child_of_node(np, child)
218 count++;
219 if (!count)
220 return 0; /* or ENODEV? */
221
222 pdata = kzalloc(sizeof(*pdata) + sizeof(struct gpio_led_data) * count,
223 GFP_KERNEL);
224 if (!pdata)
225 return -ENOMEM;
226
227 memset(&led, 0, sizeof(led));
228 for_each_child_of_node(np, child) {
229 enum of_gpio_flags flags;
Trent Piephoed88bae2009-05-12 15:33:12 -0700230 const char *state;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000231
232 led.gpio = of_get_gpio_flags(child, 0, &flags);
233 led.active_low = flags & OF_GPIO_ACTIVE_LOW;
234 led.name = of_get_property(child, "label", NULL) ? : child->name;
235 led.default_trigger =
236 of_get_property(child, "linux,default-trigger", NULL);
Trent Piephoed88bae2009-05-12 15:33:12 -0700237 state = of_get_property(child, "default-state", NULL);
238 if (state) {
239 if (!strcmp(state, "keep"))
240 led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
241 else if(!strcmp(state, "on"))
242 led.default_state = LEDS_GPIO_DEFSTATE_ON;
243 else
244 led.default_state = LEDS_GPIO_DEFSTATE_OFF;
245 }
Trent Piephoa7d878a2009-01-10 17:26:01 +0000246
247 ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++],
248 &ofdev->dev, NULL);
249 if (ret < 0) {
250 of_node_put(child);
251 goto err;
252 }
253 }
254
255 dev_set_drvdata(&ofdev->dev, pdata);
256
257 return 0;
258
259err:
260 for (count = pdata->num_leds - 2; count >= 0; count--)
261 delete_gpio_led(&pdata->led_data[count]);
262
263 kfree(pdata);
264
265 return ret;
266}
267
268static int __devexit of_gpio_leds_remove(struct of_device *ofdev)
269{
270 struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev);
271 int i;
272
273 for (i = 0; i < pdata->num_leds; i++)
274 delete_gpio_led(&pdata->led_data[i]);
275
276 kfree(pdata);
277
278 dev_set_drvdata(&ofdev->dev, NULL);
279
280 return 0;
281}
282
283static const struct of_device_id of_gpio_leds_match[] = {
284 { .compatible = "gpio-leds", },
285 {},
286};
287
288static struct of_platform_driver of_gpio_leds_driver = {
289 .driver = {
290 .name = "of_gpio_leds",
291 .owner = THIS_MODULE,
292 },
293 .match_table = of_gpio_leds_match,
294 .probe = of_gpio_leds_probe,
295 .remove = __devexit_p(of_gpio_leds_remove),
296};
Trent Piephoa7d878a2009-01-10 17:26:01 +0000297#endif
298
Richard Purdieb2bdc3e2009-02-02 23:04:42 +0000299static int __init gpio_led_init(void)
300{
301 int ret;
302
303#ifdef CONFIG_LEDS_GPIO_PLATFORM
304 ret = platform_driver_register(&gpio_led_driver);
305 if (ret)
306 return ret;
307#endif
308#ifdef CONFIG_LEDS_GPIO_OF
309 ret = of_register_platform_driver(&of_gpio_leds_driver);
310#endif
311#ifdef CONFIG_LEDS_GPIO_PLATFORM
312 if (ret)
313 platform_driver_unregister(&gpio_led_driver);
314#endif
315
316 return ret;
317}
318
319static void __exit gpio_led_exit(void)
320{
321#ifdef CONFIG_LEDS_GPIO_PLATFORM
322 platform_driver_unregister(&gpio_led_driver);
323#endif
324#ifdef CONFIG_LEDS_GPIO_OF
325 of_unregister_platform_driver(&of_gpio_leds_driver);
326#endif
327}
328
329module_init(gpio_led_init);
330module_exit(gpio_led_exit);
331
Trent Piephoa7d878a2009-01-10 17:26:01 +0000332MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
Raphael Assenat22e03f32007-02-27 19:49:53 +0000333MODULE_DESCRIPTION("GPIO LED driver");
334MODULE_LICENSE("GPL");