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
 14#include <linux/kernel.h>
 15#include <linux/init.h>
 16#include <linux/platform_device.h>
 17#include <linux/leds.h>
 18#include <linux/gpio.h>
 19#include <linux/slab.h>
 20
 21#include <mach/hardware.h>
 22#include <mach/regs-gpio.h>
 23#include <mach/leds-gpio.h>
 24
 25/* our context */
 26
 27struct s3c24xx_gpio_led {
 28	struct led_classdev		 cdev;
 29	struct s3c24xx_led_platdata	*pdata;
 30};
 31
 32static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev)
 33{
 34	return platform_get_drvdata(dev);
 35}
 36
 37static 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
 42static 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;
 47
 48	/* there will be a short delay between setting the output and
 49	 * going from output to input when using tristate. */
 50
 51	s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^
 52			    (pd->flags & S3C24XX_LEDF_ACTLOW));
 53
 54	if (pd->flags & S3C24XX_LEDF_TRISTATE)
 55		s3c2410_gpio_cfgpin(pd->gpio,
 56			value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT);
 57
 58}
 59
 60static int s3c24xx_led_remove(struct platform_device *dev)
 61{
 62	struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
 63
 64	led_classdev_unregister(&led->cdev);
 65	kfree(led);
 66
 67	return 0;
 68}
 69
 70static int s3c24xx_led_probe(struct platform_device *dev)
 71{
 72	struct s3c24xx_led_platdata *pdata = dev->dev.platform_data;
 73	struct s3c24xx_gpio_led *led;
 74	int ret;
 75
 76	led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL);
 77	if (led == NULL) {
 78		dev_err(&dev->dev, "No memory for device\n");
 79		return -ENOMEM;
 80	}
 81
 82	platform_set_drvdata(dev, led);
 83
 84	led->cdev.brightness_set = s3c24xx_led_set;
 85	led->cdev.default_trigger = pdata->def_trigger;
 86	led->cdev.name = pdata->name;
 87	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
 88
 89	led->pdata = pdata;
 90
 91	/* no point in having a pull-up if we are always driving */
 92
 93	if (pdata->flags & S3C24XX_LEDF_TRISTATE) {
 94		s3c2410_gpio_setpin(pdata->gpio, 0);
 95		s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);
 96	} else {
 97		s3c2410_gpio_pullup(pdata->gpio, 0);
 98		s3c2410_gpio_setpin(pdata->gpio, 0);
 99		s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);
100	}
101
102	/* register our new led device */
103
104	ret = led_classdev_register(&dev->dev, &led->cdev);
105	if (ret < 0) {
106		dev_err(&dev->dev, "led_classdev_register failed\n");
107		kfree(led);
108		return ret;
109	}
110
111	return 0;
112}
113
114static struct platform_driver s3c24xx_led_driver = {
115	.probe		= s3c24xx_led_probe,
116	.remove		= s3c24xx_led_remove,
117	.driver		= {
118		.name		= "s3c24xx_led",
119		.owner		= THIS_MODULE,
120	},
121};
122
123static int __init s3c24xx_led_init(void)
124{
125	return platform_driver_register(&s3c24xx_led_driver);
126}
127
128static void __exit s3c24xx_led_exit(void)
129{
130	platform_driver_unregister(&s3c24xx_led_driver);
131}
132
133module_init(s3c24xx_led_init);
134module_exit(s3c24xx_led_exit);
135
136MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
137MODULE_DESCRIPTION("S3C24XX LED driver");
138MODULE_LICENSE("GPL");
139MODULE_ALIAS("platform:s3c24xx_led");