[deliverable/linux.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/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/module.h>

#include <mach/hardware.h>
#include <mach/regs-gpio.h>
#include <mach/leds-gpio.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);
	gpio_free(led->pdata->gpio);

	return 0;
}

static int s3c24xx_led_probe(struct platform_device *dev)
{
	struct s3c24xx_led_platdata *pdata = dev->dev.platform_data;
	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 = gpio_request(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 BD	14	#include <linux/kernel.h>
	15	#include <linux/init.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/leds.h>
ec976d6e	18	#include <linux/gpio.h>
5a0e3ad6	19	#include <linux/slab.h>
54f4dedb	20	#include <linux/module.h>
54bdc470	21
a09e64fb RK	22	#include <mach/hardware.h>
	23	#include <mach/regs-gpio.h>
	24	#include <mach/leds-gpio.h>
54bdc470 BD	25
	26	/* our context */
	27
	28	struct s3c24xx_gpio_led {
	29	struct led_classdev cdev;
	30	struct s3c24xx_led_platdata *pdata;
	31	};
	32
	33	static inline struct s3c24xx_gpio_led pdev_to_gpio(struct platform_device dev)
	34	{
	35	return platform_get_drvdata(dev);
	36	}
	37
	38	static inline struct s3c24xx_gpio_led to_gpio(struct led_classdev led_cdev)
	39	{
	40	return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
	41	}
	42
	43	static void s3c24xx_led_set(struct led_classdev *led_cdev,
	44	enum led_brightness value)
	45	{
	46	struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
	47	struct s3c24xx_led_platdata *pd = led->pdata;
7d84f66f	48	int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);
54bdc470	49
4a739d55	50	/* there will be a short delay between setting the output and
54bdc470 BD	51	* going from output to input when using tristate. */
54bdc470 BD	52
7d84f66f	53	gpio_set_value(pd->gpio, state);
54bdc470	54
7d84f66f SN	55	if (pd->flags & S3C24XX_LEDF_TRISTATE) {
	56	if (value)
	57	gpio_direction_output(pd->gpio, state);
	58	else
	59	gpio_direction_input(pd->gpio);
	60	}
54bdc470 BD	61	}
	62
	63	static int s3c24xx_led_remove(struct platform_device *dev)
	64	{
	65	struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
	66
	67	led_classdev_unregister(&led->cdev);
7d84f66f	68	gpio_free(led->pdata->gpio);
54bdc470 BD	69
	70	return 0;
	71	}
	72
	73	static int s3c24xx_led_probe(struct platform_device *dev)
	74	{
	75	struct s3c24xx_led_platdata *pdata = dev->dev.platform_data;
	76	struct s3c24xx_gpio_led *led;
	77	int ret;
	78
7e97b581 SN	79	led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
7e97b581 SN	80	GFP_KERNEL);
54bdc470 BD	81	if (led == NULL) {
	82	dev_err(&dev->dev, "No memory for device\n");
	83	return -ENOMEM;
	84	}
	85
	86	platform_set_drvdata(dev, led);
	87
	88	led->cdev.brightness_set = s3c24xx_led_set;
	89	led->cdev.default_trigger = pdata->def_trigger;
	90	led->cdev.name = pdata->name;
859cb7f2	91	led->cdev.flags \|= LED_CORE_SUSPENDRESUME;
54bdc470 BD	92
	93	led->pdata = pdata;
	94
7d84f66f SN	95	ret = gpio_request(pdata->gpio, "S3C24XX_LED");
	96	if (ret < 0)
	97	return ret;
	98
54bdc470 BD	99	/* no point in having a pull-up if we are always driving */
54bdc470 BD	100
7d84f66f SN	101	s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
	102
	103	if (pdata->flags & S3C24XX_LEDF_TRISTATE)
	104	gpio_direction_input(pdata->gpio);
	105	else
	106	gpio_direction_output(pdata->gpio,
	107	pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0);
54bdc470 BD	108
	109	/* register our new led device */
	110
	111	ret = led_classdev_register(&dev->dev, &led->cdev);
7e97b581	112	if (ret < 0)
54bdc470	113	dev_err(&dev->dev, "led_classdev_register failed\n");
54bdc470	114
1522d02e	115	return ret;
54bdc470 BD	116	}
54bdc470 BD	117
54bdc470 BD	118	static struct platform_driver s3c24xx_led_driver = {
	119	.probe = s3c24xx_led_probe,
	120	.remove = s3c24xx_led_remove,
54bdc470 BD	121	.driver = {
	122	.name = "s3c24xx_led",
	123	.owner = THIS_MODULE,
	124	},
	125	};
	126
892a8843	127	module_platform_driver(s3c24xx_led_driver);
54bdc470 BD	128
	129	MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
	130	MODULE_DESCRIPTION("S3C24XX LED driver");
	131	MODULE_LICENSE("GPL");
3c4ded97	132	MODULE_ALIAS("platform:s3c24xx_led");