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
to_gpio(struct led_classdev * led_cdev)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
s3c24xx_led_set(struct led_classdev * led_cdev,enum led_brightness value)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
s3c24xx_led_probe(struct platform_device * dev)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");
84