1 /* drivers/leds/leds-s3c24xx.c
3 * (c) 2006 Simtec Electronics
4 * http://armlinux.simtec.co.uk/
5 * Ben Dooks <ben@simtec.co.uk>
7 * S3C24XX - LEDs GPIO driver
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.
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/platform_device.h>
17 #include <linux/leds.h>
19 #include <mach/hardware.h>
20 #include <mach/regs-gpio.h>
21 #include <mach/leds-gpio.h>
25 struct s3c24xx_gpio_led {
26 struct led_classdev cdev;
27 struct s3c24xx_led_platdata *pdata;
30 static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev)
32 return platform_get_drvdata(dev);
35 static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
37 return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
40 static void s3c24xx_led_set(struct led_classdev *led_cdev,
41 enum led_brightness value)
43 struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
44 struct s3c24xx_led_platdata *pd = led->pdata;
46 /* there will be a short delay between setting the output and
47 * going from output to input when using tristate. */
49 s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^
50 (pd->flags & S3C24XX_LEDF_ACTLOW));
52 if (pd->flags & S3C24XX_LEDF_TRISTATE)
53 s3c2410_gpio_cfgpin(pd->gpio,
54 value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT);
58 static int s3c24xx_led_remove(struct platform_device *dev)
60 struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
62 led_classdev_unregister(&led->cdev);
68 static int s3c24xx_led_probe(struct platform_device *dev)
70 struct s3c24xx_led_platdata *pdata = dev->dev.platform_data;
71 struct s3c24xx_gpio_led *led;
74 led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL);
76 dev_err(&dev->dev, "No memory for device\n");
80 platform_set_drvdata(dev, led);
82 led->cdev.brightness_set = s3c24xx_led_set;
83 led->cdev.default_trigger = pdata->def_trigger;
84 led->cdev.name = pdata->name;
85 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
89 /* no point in having a pull-up if we are always driving */
91 if (pdata->flags & S3C24XX_LEDF_TRISTATE) {
92 s3c2410_gpio_setpin(pdata->gpio, 0);
93 s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);
95 s3c2410_gpio_pullup(pdata->gpio, 0);
96 s3c2410_gpio_setpin(pdata->gpio, 0);
97 s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);
100 /* register our new led device */
102 ret = led_classdev_register(&dev->dev, &led->cdev);
104 dev_err(&dev->dev, "led_classdev_register failed\n");
112 static struct platform_driver s3c24xx_led_driver = {
113 .probe = s3c24xx_led_probe,
114 .remove = s3c24xx_led_remove,
116 .name = "s3c24xx_led",
117 .owner = THIS_MODULE,
121 static int __init s3c24xx_led_init(void)
123 return platform_driver_register(&s3c24xx_led_driver);
126 static void __exit s3c24xx_led_exit(void)
128 platform_driver_unregister(&s3c24xx_led_driver);
131 module_init(s3c24xx_led_init);
132 module_exit(s3c24xx_led_exit);
134 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
135 MODULE_DESCRIPTION("S3C24XX LED driver");
136 MODULE_LICENSE("GPL");
137 MODULE_ALIAS("platform:s3c24xx_led");