mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 09:44:18 +08:00
6ab3d5624e
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de>
163 lines
3.7 KiB
C
163 lines
3.7 KiB
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 <asm/arch/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 sort 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");
|