[deliverable/linux.git] / drivers / leds / leds-gpio.c

/*
 * LEDs driver for GPIOs
 *
 * Copyright (C) 2007 8D Technologies inc.
 * Raphael Assenat <raph@8d.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/workqueue.h>

#include <asm/gpio.h>

struct gpio_led_data {
	struct led_classdev cdev;
	unsigned gpio;
	struct work_struct work;
	u8 new_level;
	u8 can_sleep;
	u8 active_low;
};

static void gpio_led_work(struct work_struct *work)
{
	struct gpio_led_data	*led_dat =
		container_of(work, struct gpio_led_data, work);

	gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
}

static void gpio_led_set(struct led_classdev *led_cdev,
	enum led_brightness value)
{
	struct gpio_led_data *led_dat =
		container_of(led_cdev, struct gpio_led_data, cdev);
	int level;

	if (value == LED_OFF)
		level = 0;
	else
		level = 1;

	if (led_dat->active_low)
		level = !level;

	/* Setting GPIOs with I2C/etc requires a task context, and we don't
	 * seem to have a reliable way to know if we're already in one; so
	 * let's just assume the worst.
	 */
	if (led_dat->can_sleep) {
		led_dat->new_level = level;
		schedule_work(&led_dat->work);
	} else
		gpio_set_value(led_dat->gpio, level);
}

static int gpio_led_probe(struct platform_device *pdev)
{
	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	struct gpio_led *cur_led;
	struct gpio_led_data *leds_data, *led_dat;
	int i, ret = 0;

	if (!pdata)
		return -EBUSY;

	leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds,
				GFP_KERNEL);
	if (!leds_data)
		return -ENOMEM;

	for (i = 0; i < pdata->num_leds; i++) {
		cur_led = &pdata->leds[i];
		led_dat = &leds_data[i];

		ret = gpio_request(cur_led->gpio, cur_led->name);
		if (ret < 0)
			goto err;

		led_dat->cdev.name = cur_led->name;
		led_dat->cdev.default_trigger = cur_led->default_trigger;
		led_dat->gpio = cur_led->gpio;
		led_dat->can_sleep = gpio_cansleep(cur_led->gpio);
		led_dat->active_low = cur_led->active_low;
		led_dat->cdev.brightness_set = gpio_led_set;
		led_dat->cdev.brightness = LED_OFF;

		gpio_direction_output(led_dat->gpio, led_dat->active_low);

		INIT_WORK(&led_dat->work, gpio_led_work);

		ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
		if (ret < 0) {
			gpio_free(led_dat->gpio);
			goto err;
		}
	}

	platform_set_drvdata(pdev, leds_data);

	return 0;

err:
	if (i > 0) {
		for (i = i - 1; i >= 0; i--) {
			led_classdev_unregister(&leds_data[i].cdev);
			cancel_work_sync(&leds_data[i].work);
			gpio_free(leds_data[i].gpio);
		}
	}

	kfree(leds_data);

	return ret;
}

static int __devexit gpio_led_remove(struct platform_device *pdev)
{
	int i;
	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	struct gpio_led_data *leds_data;

	leds_data = platform_get_drvdata(pdev);

	for (i = 0; i < pdata->num_leds; i++) {
		led_classdev_unregister(&leds_data[i].cdev);
		cancel_work_sync(&leds_data[i].work);
		gpio_free(leds_data[i].gpio);
	}

	kfree(leds_data);

	return 0;
}

#ifdef CONFIG_PM
static int gpio_led_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	struct gpio_led_data *leds_data;
	int i;

	leds_data = platform_get_drvdata(pdev);

	for (i = 0; i < pdata->num_leds; i++)
		led_classdev_suspend(&leds_data[i].cdev);

	return 0;
}

static int gpio_led_resume(struct platform_device *pdev)
{
	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	struct gpio_led_data *leds_data;
	int i;

	leds_data = platform_get_drvdata(pdev);

	for (i = 0; i < pdata->num_leds; i++)
		led_classdev_resume(&leds_data[i].cdev);

	return 0;
}
#else
#define gpio_led_suspend NULL
#define gpio_led_resume NULL
#endif

static struct platform_driver gpio_led_driver = {
	.probe		= gpio_led_probe,
	.remove		= __devexit_p(gpio_led_remove),
	.suspend	= gpio_led_suspend,
	.resume		= gpio_led_resume,
	.driver		= {
		.name	= "leds-gpio",
		.owner	= THIS_MODULE,
	},
};

static int __init gpio_led_init(void)
{
	return platform_driver_register(&gpio_led_driver);
}

static void __exit gpio_led_exit(void)
{
	platform_driver_unregister(&gpio_led_driver);
}

module_init(gpio_led_init);
module_exit(gpio_led_exit);

MODULE_AUTHOR("Raphael Assenat <raph@8d.com>");
MODULE_DESCRIPTION("GPIO LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:leds-gpio");
Commit	Line	Data
22e03f3b RA	1	/*
	2	* LEDs driver for GPIOs
	3	*
	4	* Copyright (C) 2007 8D Technologies inc.
	5	* Raphael Assenat <raph@8d.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12	#include <linux/kernel.h>
	13	#include <linux/init.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/leds.h>
00852279 DB	16	#include <linux/workqueue.h>
00852279 DB	17
22e03f3b RA	18	#include <asm/gpio.h>
	19
	20	struct gpio_led_data {
	21	struct led_classdev cdev;
	22	unsigned gpio;
00852279 DB	23	struct work_struct work;
	24	u8 new_level;
	25	u8 can_sleep;
22e03f3b RA	26	u8 active_low;
	27	};
	28
00852279 DB	29	static void gpio_led_work(struct work_struct *work)
	30	{
	31	struct gpio_led_data *led_dat =
	32	container_of(work, struct gpio_led_data, work);
	33
	34	gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
	35	}
22e03f3b RA	36
	37	static void gpio_led_set(struct led_classdev *led_cdev,
	38	enum led_brightness value)
	39	{
	40	struct gpio_led_data *led_dat =
	41	container_of(led_cdev, struct gpio_led_data, cdev);
	42	int level;
	43
	44	if (value == LED_OFF)
	45	level = 0;
	46	else
	47	level = 1;
	48
	49	if (led_dat->active_low)
	50	level = !level;
	51
306dd85c DB	52	/* Setting GPIOs with I2C/etc requires a task context, and we don't
	53	* seem to have a reliable way to know if we're already in one; so
	54	* let's just assume the worst.
	55	*/
00852279	56	if (led_dat->can_sleep) {
306dd85c DB	57	led_dat->new_level = level;
306dd85c DB	58	schedule_work(&led_dat->work);
00852279 DB	59	} else
00852279 DB	60	gpio_set_value(led_dat->gpio, level);
22e03f3b RA	61	}
22e03f3b RA	62
199fb21d	63	static int gpio_led_probe(struct platform_device *pdev)
22e03f3b RA	64	{
	65	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	66	struct gpio_led *cur_led;
	67	struct gpio_led_data leds_data, led_dat;
	68	int i, ret = 0;
	69
	70	if (!pdata)
	71	return -EBUSY;
	72
	73	leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds,
	74	GFP_KERNEL);
	75	if (!leds_data)
	76	return -ENOMEM;
	77
	78	for (i = 0; i < pdata->num_leds; i++) {
	79	cur_led = &pdata->leds[i];
	80	led_dat = &leds_data[i];
	81
d95cbe61 UKK	82	ret = gpio_request(cur_led->gpio, cur_led->name);
	83	if (ret < 0)
	84	goto err;
	85
22e03f3b RA	86	led_dat->cdev.name = cur_led->name;
	87	led_dat->cdev.default_trigger = cur_led->default_trigger;
	88	led_dat->gpio = cur_led->gpio;
00852279	89	led_dat->can_sleep = gpio_cansleep(cur_led->gpio);
22e03f3b RA	90	led_dat->active_low = cur_led->active_low;
22e03f3b RA	91	led_dat->cdev.brightness_set = gpio_led_set;
2b7f1b8c	92	led_dat->cdev.brightness = LED_OFF;
22e03f3b	93
22e03f3b RA	94	gpio_direction_output(led_dat->gpio, led_dat->active_low);
22e03f3b RA	95
199fb21d DB	96	INIT_WORK(&led_dat->work, gpio_led_work);
199fb21d DB	97
22e03f3b RA	98	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
	99	if (ret < 0) {
	100	gpio_free(led_dat->gpio);
	101	goto err;
	102	}
	103	}
	104
	105	platform_set_drvdata(pdev, leds_data);
	106
	107	return 0;
	108
	109	err:
	110	if (i > 0) {
	111	for (i = i - 1; i >= 0; i--) {
	112	led_classdev_unregister(&leds_data[i].cdev);
199fb21d	113	cancel_work_sync(&leds_data[i].work);
22e03f3b RA	114	gpio_free(leds_data[i].gpio);
	115	}
	116	}
00852279	117
22e03f3b RA	118	kfree(leds_data);
	119
	120	return ret;
	121	}
	122
199fb21d	123	static int __devexit gpio_led_remove(struct platform_device *pdev)
22e03f3b RA	124	{
	125	int i;
	126	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	127	struct gpio_led_data *leds_data;
	128
	129	leds_data = platform_get_drvdata(pdev);
	130
	131	for (i = 0; i < pdata->num_leds; i++) {
	132	led_classdev_unregister(&leds_data[i].cdev);
199fb21d	133	cancel_work_sync(&leds_data[i].work);
22e03f3b RA	134	gpio_free(leds_data[i].gpio);
22e03f3b RA	135	}
199fb21d	136
22e03f3b RA	137	kfree(leds_data);
	138
	139	return 0;
	140	}
	141
	142	#ifdef CONFIG_PM
	143	static int gpio_led_suspend(struct platform_device *pdev, pm_message_t state)
	144	{
	145	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	146	struct gpio_led_data *leds_data;
	147	int i;
199fb21d	148
22e03f3b RA	149	leds_data = platform_get_drvdata(pdev);
	150
	151	for (i = 0; i < pdata->num_leds; i++)
	152	led_classdev_suspend(&leds_data[i].cdev);
	153
	154	return 0;
	155	}
	156
	157	static int gpio_led_resume(struct platform_device *pdev)
	158	{
	159	struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
	160	struct gpio_led_data *leds_data;
	161	int i;
	162
	163	leds_data = platform_get_drvdata(pdev);
	164
	165	for (i = 0; i < pdata->num_leds; i++)
	166	led_classdev_resume(&leds_data[i].cdev);
	167
	168	return 0;
	169	}
	170	#else
	171	#define gpio_led_suspend NULL
	172	#define gpio_led_resume NULL
	173	#endif
	174
	175	static struct platform_driver gpio_led_driver = {
199fb21d DB	176	.probe = gpio_led_probe,
199fb21d DB	177	.remove = __devexit_p(gpio_led_remove),
22e03f3b RA	178	.suspend = gpio_led_suspend,
	179	.resume = gpio_led_resume,
	180	.driver = {
	181	.name = "leds-gpio",
	182	.owner = THIS_MODULE,
	183	},
	184	};
	185
	186	static int __init gpio_led_init(void)
	187	{
199fb21d	188	return platform_driver_register(&gpio_led_driver);
22e03f3b RA	189	}
	190
	191	static void __exit gpio_led_exit(void)
	192	{
	193	platform_driver_unregister(&gpio_led_driver);
	194	}
	195
	196	module_init(gpio_led_init);
	197	module_exit(gpio_led_exit);
	198
	199	MODULE_AUTHOR("Raphael Assenat <raph@8d.com>");
	200	MODULE_DESCRIPTION("GPIO LED driver");
	201	MODULE_LICENSE("GPL");
3c4ded97	202	MODULE_ALIAS("platform:leds-gpio");