drivers/leds/leds-s3c24xx.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /* drivers/leds/leds-s3c24xx.c
0003  *
0004  * (c) 2006 Simtec Electronics
0005  *  http://armlinux.simtec.co.uk/
0006  *  Ben Dooks <ben@simtec.co.uk>
0007  *
0008  * S3C24XX - LEDs GPIO driver
0009 */
0010
0011 #include <linux/kernel.h>
0012 #include <linux/platform_device.h>
0013 #include <linux/leds.h>
0014 #include <linux/gpio/consumer.h>
0015 #include <linux/slab.h>
0016 #include <linux/module.h>
0017 #include <linux/platform_data/leds-s3c24xx.h>
0018
0019 /* our context */
0020
0021 struct s3c24xx_gpio_led {
0022     struct led_classdev      cdev;
0023     struct s3c24xx_led_platdata *pdata;
0024     struct gpio_desc        *gpiod;
0025 };
0026
0027 static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
0028 {
0029     return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
0030 }
0031
0032 static void s3c24xx_led_set(struct led_classdev *led_cdev,
0033                 enum led_brightness value)
0034 {
0035     struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
0036
0037     gpiod_set_value(led->gpiod, !!value);
0038 }
0039
0040 static int s3c24xx_led_probe(struct platform_device *dev)
0041 {
0042     struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
0043     struct s3c24xx_gpio_led *led;
0044     int ret;
0045
0046     led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
0047                GFP_KERNEL);
0048     if (!led)
0049         return -ENOMEM;
0050
0051     led->cdev.brightness_set = s3c24xx_led_set;
0052     led->cdev.default_trigger = pdata->def_trigger;
0053     led->cdev.name = pdata->name;
0054     led->cdev.flags |= LED_CORE_SUSPENDRESUME;
0055
0056     led->pdata = pdata;
0057
0058     /* Default to off */
0059     led->gpiod = devm_gpiod_get(&dev->dev, NULL, GPIOD_OUT_LOW);
0060     if (IS_ERR(led->gpiod))
0061         return PTR_ERR(led->gpiod);
0062
0063     /* register our new led device */
0064     ret = devm_led_classdev_register(&dev->dev, &led->cdev);
0065     if (ret < 0)
0066         dev_err(&dev->dev, "led_classdev_register failed\n");
0067
0068     return ret;
0069 }
0070
0071 static struct platform_driver s3c24xx_led_driver = {
0072     .probe      = s3c24xx_led_probe,
0073     .driver     = {
0074         .name       = "s3c24xx_led",
0075     },
0076 };
0077
0078 module_platform_driver(s3c24xx_led_driver);
0079
0080 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
0081 MODULE_DESCRIPTION("S3C24XX LED driver");
0082 MODULE_LICENSE("GPL");
0083 MODULE_ALIAS("platform:s3c24xx_led");