[mirror_ubuntu-hirsute-kernel.git] / drivers / leds / leds-s3c24xx.c

/* drivers/leds/leds-s3c24xx.c
 *
 * (c) 2006 Simtec Electronics
 *	http://armlinux.simtec.co.uk/
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * S3C24XX - LEDs GPIO driver
 *
 * 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/platform_device.h>
#include <linux/leds.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_data/leds-s3c24xx.h>

#include <mach/regs-gpio.h>
#include <plat/gpio-cfg.h>

/* our context */

struct s3c24xx_gpio_led {
	struct led_classdev		 cdev;
	struct s3c24xx_led_platdata	*pdata;
};

static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev)
{
	return platform_get_drvdata(dev);
}

static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
{
	return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
}

static void s3c24xx_led_set(struct led_classdev *led_cdev,
			    enum led_brightness value)
{
	struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
	struct s3c24xx_led_platdata *pd = led->pdata;
	int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);

	/* there will be a short delay between setting the output and
	 * going from output to input when using tristate. */

	gpio_set_value(pd->gpio, state);

	if (pd->flags & S3C24XX_LEDF_TRISTATE) {
		if (value)
			gpio_direction_output(pd->gpio, state);
		else
			gpio_direction_input(pd->gpio);
	}
}

static int s3c24xx_led_remove(struct platform_device *dev)
{
	struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);

	led_classdev_unregister(&led->cdev);

	return 0;
}

static int s3c24xx_led_probe(struct platform_device *dev)
{
	struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
	struct s3c24xx_gpio_led *led;
	int ret;

	led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
			   GFP_KERNEL);
	if (led == NULL) {
		dev_err(&dev->dev, "No memory for device\n");
		return -ENOMEM;
	}

	platform_set_drvdata(dev, led);

	led->cdev.brightness_set = s3c24xx_led_set;
	led->cdev.default_trigger = pdata->def_trigger;
	led->cdev.name = pdata->name;
	led->cdev.flags |= LED_CORE_SUSPENDRESUME;

	led->pdata = pdata;

	ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
	if (ret < 0)
		return ret;

	/* no point in having a pull-up if we are always driving */

	s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);

	if (pdata->flags & S3C24XX_LEDF_TRISTATE)
		gpio_direction_input(pdata->gpio);
	else
		gpio_direction_output(pdata->gpio,
			pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0);

	/* register our new led device */

	ret = led_classdev_register(&dev->dev, &led->cdev);
	if (ret < 0)
		dev_err(&dev->dev, "led_classdev_register failed\n");

	return ret;
}

static struct platform_driver s3c24xx_led_driver = {
	.probe		= s3c24xx_led_probe,
	.remove		= s3c24xx_led_remove,
	.driver		= {
		.name		= "s3c24xx_led",
		.owner		= THIS_MODULE,
	},
};

module_platform_driver(s3c24xx_led_driver);

MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_DESCRIPTION("S3C24XX LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:s3c24xx_led");
Commit	Line	Data
54bdc470 BD	1	/* drivers/leds/leds-s3c24xx.c
	2	*
	3	* (c) 2006 Simtec Electronics
	4	* http://armlinux.simtec.co.uk/
	5	* Ben Dooks <ben@simtec.co.uk>
	6	*
	7	* S3C24XX - LEDs GPIO driver
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
54bdc470	14	#include <linux/kernel.h>
54bdc470 BD	15	#include <linux/platform_device.h>
54bdc470 BD	16	#include <linux/leds.h>
ec976d6e	17	#include <linux/gpio.h>
5a0e3ad6	18	#include <linux/slab.h>
54f4dedb	19	#include <linux/module.h>
3cb6f44a	20	#include <linux/platform_data/leds-s3c24xx.h>
54bdc470	21
a09e64fb	22	#include <mach/regs-gpio.h>
224feb33	23	#include <plat/gpio-cfg.h>
54bdc470 BD	24
	25	/* our context */
	26
	27	struct s3c24xx_gpio_led {
	28	struct led_classdev cdev;
	29	struct s3c24xx_led_platdata *pdata;
	30	};
	31
	32	static inline struct s3c24xx_gpio_led pdev_to_gpio(struct platform_device dev)
	33	{
	34	return platform_get_drvdata(dev);
	35	}
	36
	37	static inline struct s3c24xx_gpio_led to_gpio(struct led_classdev led_cdev)
	38	{
	39	return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
	40	}
	41
	42	static void s3c24xx_led_set(struct led_classdev *led_cdev,
	43	enum led_brightness value)
	44	{
	45	struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
	46	struct s3c24xx_led_platdata *pd = led->pdata;
7d84f66f	47	int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);
54bdc470	48
4a739d55	49	/* there will be a short delay between setting the output and
54bdc470 BD	50	* going from output to input when using tristate. */
54bdc470 BD	51
7d84f66f	52	gpio_set_value(pd->gpio, state);
54bdc470	53
7d84f66f SN	54	if (pd->flags & S3C24XX_LEDF_TRISTATE) {
	55	if (value)
	56	gpio_direction_output(pd->gpio, state);
	57	else
	58	gpio_direction_input(pd->gpio);
	59	}
54bdc470 BD	60	}
	61
	62	static int s3c24xx_led_remove(struct platform_device *dev)
	63	{
	64	struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
	65
	66	led_classdev_unregister(&led->cdev);
54bdc470 BD	67
	68	return 0;
	69	}
	70
	71	static int s3c24xx_led_probe(struct platform_device *dev)
	72	{
87aae1ea	73	struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
54bdc470 BD	74	struct s3c24xx_gpio_led *led;
	75	int ret;
	76
7e97b581 SN	77	led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
7e97b581 SN	78	GFP_KERNEL);
54bdc470 BD	79	if (led == NULL) {
	80	dev_err(&dev->dev, "No memory for device\n");
	81	return -ENOMEM;
	82	}
	83
	84	platform_set_drvdata(dev, led);
	85
	86	led->cdev.brightness_set = s3c24xx_led_set;
	87	led->cdev.default_trigger = pdata->def_trigger;
	88	led->cdev.name = pdata->name;
859cb7f2	89	led->cdev.flags \|= LED_CORE_SUSPENDRESUME;
54bdc470 BD	90
	91	led->pdata = pdata;
	92
5ecf6e40	93	ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
7d84f66f SN	94	if (ret < 0)
	95	return ret;
	96
54bdc470 BD	97	/* no point in having a pull-up if we are always driving */
54bdc470 BD	98
7d84f66f SN	99	s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
	100
	101	if (pdata->flags & S3C24XX_LEDF_TRISTATE)
	102	gpio_direction_input(pdata->gpio);
	103	else
	104	gpio_direction_output(pdata->gpio,
	105	pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0);
54bdc470 BD	106
	107	/* register our new led device */
	108
	109	ret = led_classdev_register(&dev->dev, &led->cdev);
7e97b581	110	if (ret < 0)
54bdc470	111	dev_err(&dev->dev, "led_classdev_register failed\n");
54bdc470	112
1522d02e	113	return ret;
54bdc470 BD	114	}
54bdc470 BD	115
54bdc470 BD	116	static struct platform_driver s3c24xx_led_driver = {
	117	.probe = s3c24xx_led_probe,
	118	.remove = s3c24xx_led_remove,
54bdc470 BD	119	.driver = {
	120	.name = "s3c24xx_led",
	121	.owner = THIS_MODULE,
	122	},
	123	};
	124
892a8843	125	module_platform_driver(s3c24xx_led_driver);
54bdc470 BD	126
	127	MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
	128	MODULE_DESCRIPTION("S3C24XX LED driver");
	129	MODULE_LICENSE("GPL");
3c4ded97	130	MODULE_ALIAS("platform:s3c24xx_led");