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Linux/drivers/leds/leds-s3c24xx.c

  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/platform_device.h>
 16 #include <linux/leds.h>
 17 #include <linux/gpio.h>
 18 #include <linux/slab.h>
 19 #include <linux/module.h>
 20 #include <linux/platform_data/leds-s3c24xx.h>
 21 
 22 #include <mach/regs-gpio.h>
 23 #include <plat/gpio-cfg.h>
 24 
 25 /* our context */
 26 
 27 struct s3c24xx_gpio_led {
 28         struct led_classdev              cdev;
 29         struct s3c24xx_led_platdata     *pdata;
 30 };
 31 
 32 static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
 33 {
 34         return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
 35 }
 36 
 37 static void s3c24xx_led_set(struct led_classdev *led_cdev,
 38                             enum led_brightness value)
 39 {
 40         struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
 41         struct s3c24xx_led_platdata *pd = led->pdata;
 42         int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);
 43 
 44         /* there will be a short delay between setting the output and
 45          * going from output to input when using tristate. */
 46 
 47         gpio_set_value(pd->gpio, state);
 48 
 49         if (pd->flags & S3C24XX_LEDF_TRISTATE) {
 50                 if (value)
 51                         gpio_direction_output(pd->gpio, state);
 52                 else
 53                         gpio_direction_input(pd->gpio);
 54         }
 55 }
 56 
 57 static int s3c24xx_led_probe(struct platform_device *dev)
 58 {
 59         struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
 60         struct s3c24xx_gpio_led *led;
 61         int ret;
 62 
 63         led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
 64                            GFP_KERNEL);
 65         if (!led)
 66                 return -ENOMEM;
 67 
 68         led->cdev.brightness_set = s3c24xx_led_set;
 69         led->cdev.default_trigger = pdata->def_trigger;
 70         led->cdev.name = pdata->name;
 71         led->cdev.flags |= LED_CORE_SUSPENDRESUME;
 72 
 73         led->pdata = pdata;
 74 
 75         ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
 76         if (ret < 0)
 77                 return ret;
 78 
 79         /* no point in having a pull-up if we are always driving */
 80 
 81         s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
 82 
 83         if (pdata->flags & S3C24XX_LEDF_TRISTATE)
 84                 gpio_direction_input(pdata->gpio);
 85         else
 86                 gpio_direction_output(pdata->gpio,
 87                         pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0);
 88 
 89         /* register our new led device */
 90 
 91         ret = devm_led_classdev_register(&dev->dev, &led->cdev);
 92         if (ret < 0)
 93                 dev_err(&dev->dev, "led_classdev_register failed\n");
 94 
 95         return ret;
 96 }
 97 
 98 static struct platform_driver s3c24xx_led_driver = {
 99         .probe          = s3c24xx_led_probe,
100         .driver         = {
101                 .name           = "s3c24xx_led",
102         },
103 };
104 
105 module_platform_driver(s3c24xx_led_driver);
106 
107 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
108 MODULE_DESCRIPTION("S3C24XX LED driver");
109 MODULE_LICENSE("GPL");
110 MODULE_ALIAS("platform:s3c24xx_led");
111 

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