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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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
David Brownell00852272007-05-10 10:51:41 +010018#include <linux/workqueue.h>
19
Raphael Assenat22e03f32007-02-27 19:49:53 +000020#include <asm/gpio.h>
21
22struct gpio_led_data {
23 struct led_classdev cdev;
24 unsigned gpio;
David Brownell00852272007-05-10 10:51:41 +010025 struct work_struct work;
26 u8 new_level;
27 u8 can_sleep;
Raphael Assenat22e03f32007-02-27 19:49:53 +000028 u8 active_low;
Herbert Valerio Riedelca3259b2008-03-09 23:48:25 +000029 int (*platform_gpio_blink_set)(unsigned gpio,
30 unsigned long *delay_on, unsigned long *delay_off);
Raphael Assenat22e03f32007-02-27 19:49:53 +000031};
32
David Brownell00852272007-05-10 10:51:41 +010033static void gpio_led_work(struct work_struct *work)
34{
35 struct gpio_led_data *led_dat =
36 container_of(work, struct gpio_led_data, work);
37
38 gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
39}
Raphael Assenat22e03f32007-02-27 19:49:53 +000040
41static void gpio_led_set(struct led_classdev *led_cdev,
42 enum led_brightness value)
43{
44 struct gpio_led_data *led_dat =
45 container_of(led_cdev, struct gpio_led_data, cdev);
46 int level;
47
48 if (value == LED_OFF)
49 level = 0;
50 else
51 level = 1;
52
53 if (led_dat->active_low)
54 level = !level;
55
David Brownell306dd852008-03-27 00:59:02 +000056 /* Setting GPIOs with I2C/etc requires a task context, and we don't
57 * seem to have a reliable way to know if we're already in one; so
58 * let's just assume the worst.
59 */
David Brownell00852272007-05-10 10:51:41 +010060 if (led_dat->can_sleep) {
David Brownell306dd852008-03-27 00:59:02 +000061 led_dat->new_level = level;
62 schedule_work(&led_dat->work);
David Brownell00852272007-05-10 10:51:41 +010063 } else
64 gpio_set_value(led_dat->gpio, level);
Raphael Assenat22e03f32007-02-27 19:49:53 +000065}
66
Herbert Valerio Riedelca3259b2008-03-09 23:48:25 +000067static int gpio_blink_set(struct led_classdev *led_cdev,
68 unsigned long *delay_on, unsigned long *delay_off)
69{
70 struct gpio_led_data *led_dat =
71 container_of(led_cdev, struct gpio_led_data, cdev);
72
73 return led_dat->platform_gpio_blink_set(led_dat->gpio, delay_on, delay_off);
74}
75
Trent Piephoa7d878a2009-01-10 17:26:01 +000076static int __devinit create_gpio_led(const struct gpio_led *template,
77 struct gpio_led_data *led_dat, struct device *parent,
78 int (*blink_set)(unsigned, unsigned long *, unsigned long *))
79{
Trent Piephoed88bae2009-05-12 15:33:12 -070080 int ret, state;
Trent Piephoa7d878a2009-01-10 17:26:01 +000081
Dmitry Eremin-Solenikov0b4634f2009-11-16 01:48:32 +030082 led_dat->gpio = -1;
83
David Brownelld379ee82009-03-05 16:46:44 -080084 /* skip leds that aren't available */
85 if (!gpio_is_valid(template->gpio)) {
Michal Simek2fea0922009-08-06 16:04:51 -070086 printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n",
David Brownelld379ee82009-03-05 16:46:44 -080087 template->gpio, template->name);
David Brownellac15e952009-04-07 17:51:49 -070088 return 0;
David Brownelld379ee82009-03-05 16:46:44 -080089 }
90
Trent Piephoa7d878a2009-01-10 17:26:01 +000091 ret = gpio_request(template->gpio, template->name);
92 if (ret < 0)
93 return ret;
94
95 led_dat->cdev.name = template->name;
96 led_dat->cdev.default_trigger = template->default_trigger;
97 led_dat->gpio = template->gpio;
98 led_dat->can_sleep = gpio_cansleep(template->gpio);
99 led_dat->active_low = template->active_low;
100 if (blink_set) {
101 led_dat->platform_gpio_blink_set = blink_set;
102 led_dat->cdev.blink_set = gpio_blink_set;
103 }
104 led_dat->cdev.brightness_set = gpio_led_set;
Trent Piephoed88bae2009-05-12 15:33:12 -0700105 if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
106 state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low;
107 else
108 state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
109 led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
Richard Purdiedefb5122009-02-17 15:04:07 +0000110 if (!template->retain_state_suspended)
111 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000112
Trent Piephoed88bae2009-05-12 15:33:12 -0700113 ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
Trent Piephoa7d878a2009-01-10 17:26:01 +0000114 if (ret < 0)
115 goto err;
116
117 INIT_WORK(&led_dat->work, gpio_led_work);
118
119 ret = led_classdev_register(parent, &led_dat->cdev);
120 if (ret < 0)
121 goto err;
122
123 return 0;
124err:
125 gpio_free(led_dat->gpio);
126 return ret;
127}
128
129static void delete_gpio_led(struct gpio_led_data *led)
130{
David Brownelld379ee82009-03-05 16:46:44 -0800131 if (!gpio_is_valid(led->gpio))
132 return;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000133 led_classdev_unregister(&led->cdev);
134 cancel_work_sync(&led->work);
135 gpio_free(led->gpio);
136}
137
138#ifdef CONFIG_LEDS_GPIO_PLATFORM
Zhenwen Xu7fd02172009-06-10 12:48:51 -0700139static int __devinit gpio_led_probe(struct platform_device *pdev)
Raphael Assenat22e03f32007-02-27 19:49:53 +0000140{
141 struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000142 struct gpio_led_data *leds_data;
Raphael Assenat22e03f32007-02-27 19:49:53 +0000143 int i, ret = 0;
144
145 if (!pdata)
146 return -EBUSY;
147
148 leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds,
149 GFP_KERNEL);
150 if (!leds_data)
151 return -ENOMEM;
152
153 for (i = 0; i < pdata->num_leds; i++) {
Trent Piephoa7d878a2009-01-10 17:26:01 +0000154 ret = create_gpio_led(&pdata->leds[i], &leds_data[i],
155 &pdev->dev, pdata->gpio_blink_set);
Uwe Kleine-Königd95cbe62008-03-09 20:42:27 +0000156 if (ret < 0)
157 goto err;
Raphael Assenat22e03f32007-02-27 19:49:53 +0000158 }
159
160 platform_set_drvdata(pdev, leds_data);
161
162 return 0;
163
164err:
Trent Piephoa7d878a2009-01-10 17:26:01 +0000165 for (i = i - 1; i >= 0; i--)
166 delete_gpio_led(&leds_data[i]);
David Brownell00852272007-05-10 10:51:41 +0100167
Raphael Assenat22e03f32007-02-27 19:49:53 +0000168 kfree(leds_data);
169
170 return ret;
171}
172
David Brownell199fb212007-10-31 10:37:37 +0100173static int __devexit gpio_led_remove(struct platform_device *pdev)
Raphael Assenat22e03f32007-02-27 19:49:53 +0000174{
175 int i;
176 struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
177 struct gpio_led_data *leds_data;
178
179 leds_data = platform_get_drvdata(pdev);
180
Trent Piephoa7d878a2009-01-10 17:26:01 +0000181 for (i = 0; i < pdata->num_leds; i++)
182 delete_gpio_led(&leds_data[i]);
David Brownell199fb212007-10-31 10:37:37 +0100183
Raphael Assenat22e03f32007-02-27 19:49:53 +0000184 kfree(leds_data);
185
186 return 0;
187}
188
Raphael Assenat22e03f32007-02-27 19:49:53 +0000189static struct platform_driver gpio_led_driver = {
David Brownell199fb212007-10-31 10:37:37 +0100190 .probe = gpio_led_probe,
191 .remove = __devexit_p(gpio_led_remove),
Raphael Assenat22e03f32007-02-27 19:49:53 +0000192 .driver = {
193 .name = "leds-gpio",
194 .owner = THIS_MODULE,
195 },
196};
197
Trent Piephoa7d878a2009-01-10 17:26:01 +0000198MODULE_ALIAS("platform:leds-gpio");
199#endif /* CONFIG_LEDS_GPIO_PLATFORM */
200
201/* Code to create from OpenFirmware platform devices */
202#ifdef CONFIG_LEDS_GPIO_OF
203#include <linux/of_platform.h>
204#include <linux/of_gpio.h>
205
206struct gpio_led_of_platform_data {
207 int num_leds;
208 struct gpio_led_data led_data[];
209};
210
211static int __devinit of_gpio_leds_probe(struct of_device *ofdev,
212 const struct of_device_id *match)
213{
214 struct device_node *np = ofdev->node, *child;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000215 struct gpio_led_of_platform_data *pdata;
216 int count = 0, ret;
217
218 /* count LEDs defined by this device, so we know how much to allocate */
219 for_each_child_of_node(np, child)
220 count++;
221 if (!count)
222 return 0; /* or ENODEV? */
223
224 pdata = kzalloc(sizeof(*pdata) + sizeof(struct gpio_led_data) * count,
225 GFP_KERNEL);
226 if (!pdata)
227 return -ENOMEM;
228
Trent Piephoa7d878a2009-01-10 17:26:01 +0000229 for_each_child_of_node(np, child) {
Anton Vorontsov0493a4f2010-03-11 13:58:47 -0800230 struct gpio_led led = {};
Trent Piephoa7d878a2009-01-10 17:26:01 +0000231 enum of_gpio_flags flags;
Trent Piephoed88bae2009-05-12 15:33:12 -0700232 const char *state;
Trent Piephoa7d878a2009-01-10 17:26:01 +0000233
234 led.gpio = of_get_gpio_flags(child, 0, &flags);
235 led.active_low = flags & OF_GPIO_ACTIVE_LOW;
236 led.name = of_get_property(child, "label", NULL) ? : child->name;
237 led.default_trigger =
238 of_get_property(child, "linux,default-trigger", NULL);
Trent Piephoed88bae2009-05-12 15:33:12 -0700239 state = of_get_property(child, "default-state", NULL);
240 if (state) {
241 if (!strcmp(state, "keep"))
242 led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
243 else if(!strcmp(state, "on"))
244 led.default_state = LEDS_GPIO_DEFSTATE_ON;
245 else
246 led.default_state = LEDS_GPIO_DEFSTATE_OFF;
247 }
Trent Piephoa7d878a2009-01-10 17:26:01 +0000248
249 ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++],
250 &ofdev->dev, NULL);
251 if (ret < 0) {
252 of_node_put(child);
253 goto err;
254 }
255 }
256
257 dev_set_drvdata(&ofdev->dev, pdata);
258
259 return 0;
260
261err:
262 for (count = pdata->num_leds - 2; count >= 0; count--)
263 delete_gpio_led(&pdata->led_data[count]);
264
265 kfree(pdata);
266
267 return ret;
268}
269
270static int __devexit of_gpio_leds_remove(struct of_device *ofdev)
271{
272 struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev);
273 int i;
274
275 for (i = 0; i < pdata->num_leds; i++)
276 delete_gpio_led(&pdata->led_data[i]);
277
278 kfree(pdata);
279
280 dev_set_drvdata(&ofdev->dev, NULL);
281
282 return 0;
283}
284
285static const struct of_device_id of_gpio_leds_match[] = {
286 { .compatible = "gpio-leds", },
287 {},
288};
289
290static struct of_platform_driver of_gpio_leds_driver = {
291 .driver = {
292 .name = "of_gpio_leds",
293 .owner = THIS_MODULE,
294 },
295 .match_table = of_gpio_leds_match,
296 .probe = of_gpio_leds_probe,
297 .remove = __devexit_p(of_gpio_leds_remove),
298};
Trent Piephoa7d878a2009-01-10 17:26:01 +0000299#endif
300
Richard Purdieb2bdc3e2009-02-02 23:04:42 +0000301static int __init gpio_led_init(void)
302{
303 int ret;
304
305#ifdef CONFIG_LEDS_GPIO_PLATFORM
306 ret = platform_driver_register(&gpio_led_driver);
307 if (ret)
308 return ret;
309#endif
310#ifdef CONFIG_LEDS_GPIO_OF
311 ret = of_register_platform_driver(&of_gpio_leds_driver);
312#endif
313#ifdef CONFIG_LEDS_GPIO_PLATFORM
314 if (ret)
315 platform_driver_unregister(&gpio_led_driver);
316#endif
317
318 return ret;
319}
320
321static void __exit gpio_led_exit(void)
322{
323#ifdef CONFIG_LEDS_GPIO_PLATFORM
324 platform_driver_unregister(&gpio_led_driver);
325#endif
326#ifdef CONFIG_LEDS_GPIO_OF
327 of_unregister_platform_driver(&of_gpio_leds_driver);
328#endif
329}
330
331module_init(gpio_led_init);
332module_exit(gpio_led_exit);
333
Trent Piephoa7d878a2009-01-10 17:26:01 +0000334MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
Raphael Assenat22e03f32007-02-27 19:49:53 +0000335MODULE_DESCRIPTION("GPIO LED driver");
336MODULE_LICENSE("GPL");