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/* 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 <asm/hardware.h>

#include <asm/arch/regs-gpio.h>

#include <asm/arch/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;

        /* there will be a short delay between setting the output and

         * going from output to input when using tristate. */

        s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^

                            (pd->flags & S3C24XX_LEDF_ACTLOW));

        if (pd->flags & S3C24XX_LEDF_TRISTATE)

                s3c2410_gpio_cfgpin(pd->gpio,

                                    value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT);

}

static int s3c24xx_led_remove(struct platform_device *dev)

{

        struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);

        led_classdev_unregister(&led->cdev);

        kfree(led);

        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 = kzalloc(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->pdata = pdata;

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

        if (pdata->flags & S3C24XX_LEDF_TRISTATE) {

                s3c2410_gpio_setpin(pdata->gpio, 0);

                s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);

        } else {

                s3c2410_gpio_pullup(pdata->gpio, 0);

                s3c2410_gpio_setpin(pdata->gpio, 0);

                s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);

        }

        /* 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");

                goto exit_err1;

        }

        return 0;

 exit_err1:

        kfree(led);

        return ret;

}

#ifdef CONFIG_PM

static int s3c24xx_led_suspend(struct platform_device *dev, pm_message_t state)

{

        struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);

        led_classdev_suspend(&led->cdev);

        return 0;

}

static int s3c24xx_led_resume(struct platform_device *dev)

{

        struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);

        led_classdev_resume(&led->cdev);

        return 0;

}

#else

#define s3c24xx_led_suspend NULL

#define s3c24xx_led_resume NULL

#endif

static struct platform_driver s3c24xx_led_driver = {

        .probe          = s3c24xx_led_probe,

        .remove         = s3c24xx_led_remove,

        .suspend        = s3c24xx_led_suspend,

        .resume         = s3c24xx_led_resume,

        .driver         = {

                .name           = "s3c24xx_led",

                .owner          = THIS_MODULE,

        },

};

static int __init s3c24xx_led_init(void)

{

        return platform_driver_register(&s3c24xx_led_driver);

}

static void __exit s3c24xx_led_exit(void)

{

        platform_driver_unregister(&s3c24xx_led_driver);

}

module_init(s3c24xx_led_init);

module_exit(s3c24xx_led_exit);

MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");

MODULE_DESCRIPTION("S3C24XX LED driver");

MODULE_LICENSE("GPL");