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");

 
  1/* drivers/leds/leds-s3c24xx.c
  2 *
  3 * (c) 2006 Simtec Electronics
  4 *	http://armlinux.simtec.co.uk/
  5 *	Ben Dooks <ben@simtec.co.uk>
  6 *
  7 * S3C24XX - LEDs GPIO driver
  8 *
  9 * This program is free software; you can redistribute it and/or modify
 10 * it under the terms of the GNU General Public License version 2 as
 11 * published by the Free Software Foundation.
 12*/
 13
 14#include <linux/kernel.h>
 15#include <linux/platform_device.h>
 16#include <linux/leds.h>
 17#include <linux/gpio.h>
 18#include <linux/slab.h>
 19#include <linux/module.h>
 20#include <linux/platform_data/leds-s3c24xx.h>
 21
 22#include <mach/regs-gpio.h>
 23#include <plat/gpio-cfg.h>
 24
 25/* our context */
 26
 27struct s3c24xx_gpio_led {
 28	struct led_classdev		 cdev;
 29	struct s3c24xx_led_platdata	*pdata;
 
 30};
 31
 32static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
 33{
 34	return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
 35}
 36
 37static void s3c24xx_led_set(struct led_classdev *led_cdev,
 38			    enum led_brightness value)
 39{
 40	struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
 41	struct s3c24xx_led_platdata *pd = led->pdata;
 42	int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);
 43
 44	/* there will be a short delay between setting the output and
 45	 * going from output to input when using tristate. */
 46
 47	gpio_set_value(pd->gpio, state);
 48
 49	if (pd->flags & S3C24XX_LEDF_TRISTATE) {
 50		if (value)
 51			gpio_direction_output(pd->gpio, state);
 52		else
 53			gpio_direction_input(pd->gpio);
 54	}
 55}
 56
 57static int s3c24xx_led_probe(struct platform_device *dev)
 58{
 59	struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
 60	struct s3c24xx_gpio_led *led;
 61	int ret;
 62
 63	led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
 64			   GFP_KERNEL);
 65	if (!led)
 66		return -ENOMEM;
 67
 68	led->cdev.brightness_set = s3c24xx_led_set;
 69	led->cdev.default_trigger = pdata->def_trigger;
 70	led->cdev.name = pdata->name;
 71	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
 72
 73	led->pdata = pdata;
 74
 75	ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
 76	if (ret < 0)
 77		return ret;
 78
 79	/* no point in having a pull-up if we are always driving */
 80
 81	s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
 82
 83	if (pdata->flags & S3C24XX_LEDF_TRISTATE)
 84		gpio_direction_input(pdata->gpio);
 85	else
 86		gpio_direction_output(pdata->gpio,
 87			pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0);
 88
 89	/* register our new led device */
 90
 91	ret = devm_led_classdev_register(&dev->dev, &led->cdev);
 92	if (ret < 0)
 93		dev_err(&dev->dev, "led_classdev_register failed\n");
 94
 95	return ret;
 96}
 97
 98static struct platform_driver s3c24xx_led_driver = {
 99	.probe		= s3c24xx_led_probe,
100	.driver		= {
101		.name		= "s3c24xx_led",
102	},
103};
104
105module_platform_driver(s3c24xx_led_driver);
106
107MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
108MODULE_DESCRIPTION("S3C24XX LED driver");
109MODULE_LICENSE("GPL");
110MODULE_ALIAS("platform:s3c24xx_led");