drivers/leds/leds-s3c24xx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* drivers/leds/leds-s3c24xx.c
   3  *
   4  * (c) 2006 Simtec Electronics
   5  *      http://armlinux.simtec.co.uk/
   6  *      Ben Dooks <ben@simtec.co.uk>
   7  *
   8  * S3C24XX - LEDs GPIO driver
   9 */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/leds.h>
  14 #include <linux/gpio/consumer.h>
  15 #include <linux/slab.h>
  16 #include <linux/module.h>
  17 #include <linux/platform_data/leds-s3c24xx.h>
  18
  19 #include <mach/regs-gpio.h>
  20
  21 /* our context */
  22
  23 struct s3c24xx_gpio_led {
  24         struct led_classdev              cdev;
  25         struct s3c24xx_led_platdata     *pdata;
  26         struct gpio_desc                *gpiod;
  27 };
  28
  29 static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
  30 {
  31         return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
  32 }
  33
  34 static void s3c24xx_led_set(struct led_classdev *led_cdev,
  35                             enum led_brightness value)
  36 {
  37         struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
  38
  39         gpiod_set_value(led->gpiod, !!value);
  40 }
  41
  42 static int s3c24xx_led_probe(struct platform_device *dev)
  43 {
  44         struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
  45         struct s3c24xx_gpio_led *led;
  46         int ret;
  47
  48         led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
  49                            GFP_KERNEL);
  50         if (!led)
  51                 return -ENOMEM;
  52
  53         led->cdev.brightness_set = s3c24xx_led_set;
  54         led->cdev.default_trigger = pdata->def_trigger;
  55         led->cdev.name = pdata->name;
  56         led->cdev.flags |= LED_CORE_SUSPENDRESUME;
  57
  58         led->pdata = pdata;
  59
  60         /* Default to off */
  61         led->gpiod = devm_gpiod_get(&dev->dev, NULL, GPIOD_OUT_LOW);
  62         if (IS_ERR(led->gpiod))
  63                 return PTR_ERR(led->gpiod);
  64
  65         /* register our new led device */
  66         ret = devm_led_classdev_register(&dev->dev, &led->cdev);
  67         if (ret < 0)
  68                 dev_err(&dev->dev, "led_classdev_register failed\n");
  69
  70         return ret;
  71 }
  72
  73 static struct platform_driver s3c24xx_led_driver = {
  74         .probe          = s3c24xx_led_probe,
  75         .driver         = {
  76                 .name           = "s3c24xx_led",
  77         },
  78 };
  79
  80 module_platform_driver(s3c24xx_led_driver);
  81
  82 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
  83 MODULE_DESCRIPTION("S3C24XX LED driver");
  84 MODULE_LICENSE("GPL");
  85 MODULE_ALIAS("platform:s3c24xx_led");