linux/drivers/leds/leds-s3c24xx.c
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   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
  21struct s3c24xx_gpio_led {
  22        struct led_classdev              cdev;
  23        struct s3c24xx_led_platdata     *pdata;
  24        struct gpio_desc                *gpiod;
  25};
  26
  27static 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
  32static 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
  40static 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
  71static struct platform_driver s3c24xx_led_driver = {
  72        .probe          = s3c24xx_led_probe,
  73        .driver         = {
  74                .name           = "s3c24xx_led",
  75        },
  76};
  77
  78module_platform_driver(s3c24xx_led_driver);
  79
  80MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
  81MODULE_DESCRIPTION("S3C24XX LED driver");
  82MODULE_LICENSE("GPL");
  83MODULE_ALIAS("platform:s3c24xx_led");
  84