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 /* our context */
  20
  21 struct s3c24xx_gpio_led {
  22         struct led_classdev              cdev;
  23         struct s3c24xx_led_platdata     *pdata;
  24         struct gpio_desc                *gpiod;
  25 };
  26
  27 static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
  28 {
  29         return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
  30 }
  31
  32 static void s3c24xx_led_set(struct led_classdev *led_cdev,
  33                             enum led_brightness value)
  34 {
  35         struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
  36
  37         gpiod_set_value(led->gpiod, !!value);
  38 }
  39
  40 static int s3c24xx_led_probe(struct platform_device *dev)
  41 {
  42         struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
  43         struct s3c24xx_gpio_led *led;
  44         int ret;
  45
  46         led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
  47                            GFP_KERNEL);
  48         if (!led)
  49                 return -ENOMEM;
  50
  51         led->cdev.brightness_set = s3c24xx_led_set;
  52         led->cdev.default_trigger = pdata->def_trigger;
  53         led->cdev.name = pdata->name;
  54         led->cdev.flags |= LED_CORE_SUSPENDRESUME;
  55
  56         led->pdata = pdata;
  57
  58         /* Default to off */
  59         led->gpiod = devm_gpiod_get(&dev->dev, NULL, GPIOD_OUT_LOW);
  60         if (IS_ERR(led->gpiod))
  61                 return PTR_ERR(led->gpiod);
  62
  63         /* register our new led device */
  64         ret = devm_led_classdev_register(&dev->dev, &led->cdev);
  65         if (ret < 0)
  66                 dev_err(&dev->dev, "led_classdev_register failed\n");
  67
  68         return ret;
  69 }
  70
  71 static struct platform_driver s3c24xx_led_driver = {
  72         .probe          = s3c24xx_led_probe,
  73         .driver         = {
  74                 .name           = "s3c24xx_led",
  75         },
  76 };
  77
  78 module_platform_driver(s3c24xx_led_driver);
  79
  80 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
  81 MODULE_DESCRIPTION("S3C24XX LED driver");
  82 MODULE_LICENSE("GPL");
  83 MODULE_ALIAS("platform:s3c24xx_led");