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 *pdev_to_gpio(struct platform_device *dev)
33{
34	return platform_get_drvdata(dev);
35}
36
37static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
38{
39	return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
40}
41
42static void s3c24xx_led_set(struct led_classdev *led_cdev,
43			    enum led_brightness value)
44{
45	struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
46	struct s3c24xx_led_platdata *pd = led->pdata;
47	int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);
48
49	/* there will be a short delay between setting the output and
50	 * going from output to input when using tristate. */
51
52	gpio_set_value(pd->gpio, state);
53
54	if (pd->flags & S3C24XX_LEDF_TRISTATE) {
55		if (value)
56			gpio_direction_output(pd->gpio, state);
57		else
58			gpio_direction_input(pd->gpio);
59	}
60}
61
62static int s3c24xx_led_remove(struct platform_device *dev)
63{
64	struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
65
66	led_classdev_unregister(&led->cdev);
67
68	return 0;
69}
70
71static int s3c24xx_led_probe(struct platform_device *dev)
72{
73	struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
74	struct s3c24xx_gpio_led *led;
75	int ret;
76
77	led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
78			   GFP_KERNEL);
79	if (!led)
80		return -ENOMEM;
81
82	platform_set_drvdata(dev, led);
83
84	led->cdev.brightness_set = s3c24xx_led_set;
85	led->cdev.default_trigger = pdata->def_trigger;
86	led->cdev.name = pdata->name;
87	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
88
89	led->pdata = pdata;
90
91	ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
92	if (ret < 0)
93		return ret;
94
95	/* no point in having a pull-up if we are always driving */
96
97	s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
98
99	if (pdata->flags & S3C24XX_LEDF_TRISTATE)
100		gpio_direction_input(pdata->gpio);
101	else
102		gpio_direction_output(pdata->gpio,
103			pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0);
104
105	/* register our new led device */
106
107	ret = led_classdev_register(&dev->dev, &led->cdev);
108	if (ret < 0)
109		dev_err(&dev->dev, "led_classdev_register failed\n");
110
111	return ret;
112}
113
114static struct platform_driver s3c24xx_led_driver = {
115	.probe		= s3c24xx_led_probe,
116	.remove		= s3c24xx_led_remove,
117	.driver		= {
118		.name		= "s3c24xx_led",
119	},
120};
121
122module_platform_driver(s3c24xx_led_driver);
123
124MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
125MODULE_DESCRIPTION("S3C24XX LED driver");
126MODULE_LICENSE("GPL");
127MODULE_ALIAS("platform:s3c24xx_led");
128