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/init.h>
16#include <linux/platform_device.h>
17#include <linux/leds.h>
18
19#include <asm/hardware.h>
20#include <asm/arch/regs-gpio.h>
21#include <asm/arch/leds-gpio.h>
22
23/* our context */
24
25struct s3c24xx_gpio_led {
26	struct led_classdev		 cdev;
27	struct s3c24xx_led_platdata	*pdata;
28};
29
30static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev)
31{
32	return platform_get_drvdata(dev);
33}
34
35static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
36{
37	return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
38}
39
40static void s3c24xx_led_set(struct led_classdev *led_cdev,
41			    enum led_brightness value)
42{
43	struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
44	struct s3c24xx_led_platdata *pd = led->pdata;
45
46	/* there will be a sort delay between setting the output and
47	 * going from output to input when using tristate. */
48
49	s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^
50			    (pd->flags & S3C24XX_LEDF_ACTLOW));
51
52	if (pd->flags & S3C24XX_LEDF_TRISTATE)
53		s3c2410_gpio_cfgpin(pd->gpio,
54				    value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT);
55
56}
57
58static int s3c24xx_led_remove(struct platform_device *dev)
59{
60	struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
61
62	led_classdev_unregister(&led->cdev);
63	kfree(led);
64
65	return 0;
66}
67
68static int s3c24xx_led_probe(struct platform_device *dev)
69{
70	struct s3c24xx_led_platdata *pdata = dev->dev.platform_data;
71	struct s3c24xx_gpio_led *led;
72	int ret;
73
74	led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL);
75	if (led == NULL) {
76		dev_err(&dev->dev, "No memory for device\n");
77		return -ENOMEM;
78	}
79
80	platform_set_drvdata(dev, led);
81
82	led->cdev.brightness_set = s3c24xx_led_set;
83	led->cdev.default_trigger = pdata->def_trigger;
84	led->cdev.name = pdata->name;
85
86	led->pdata = pdata;
87
88	/* no point in having a pull-up if we are always driving */
89
90	if (pdata->flags & S3C24XX_LEDF_TRISTATE) {
91		s3c2410_gpio_setpin(pdata->gpio, 0);
92		s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);
93	} else {
94		s3c2410_gpio_pullup(pdata->gpio, 0);
95		s3c2410_gpio_setpin(pdata->gpio, 0);
96		s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);
97	}
98
99	/* register our new led device */
100
101	ret = led_classdev_register(&dev->dev, &led->cdev);
102	if (ret < 0) {
103		dev_err(&dev->dev, "led_classdev_register failed\n");
104		goto exit_err1;
105	}
106
107	return 0;
108
109 exit_err1:
110	kfree(led);
111	return ret;
112}
113
114
115#ifdef CONFIG_PM
116static int s3c24xx_led_suspend(struct platform_device *dev, pm_message_t state)
117{
118	struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
119
120	led_classdev_suspend(&led->cdev);
121	return 0;
122}
123
124static int s3c24xx_led_resume(struct platform_device *dev)
125{
126	struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
127
128	led_classdev_resume(&led->cdev);
129	return 0;
130}
131#else
132#define s3c24xx_led_suspend NULL
133#define s3c24xx_led_resume NULL
134#endif
135
136static struct platform_driver s3c24xx_led_driver = {
137	.probe		= s3c24xx_led_probe,
138	.remove		= s3c24xx_led_remove,
139	.suspend	= s3c24xx_led_suspend,
140	.resume		= s3c24xx_led_resume,
141	.driver		= {
142		.name		= "s3c24xx_led",
143		.owner		= THIS_MODULE,
144	},
145};
146
147static int __init s3c24xx_led_init(void)
148{
149	return platform_driver_register(&s3c24xx_led_driver);
150}
151
152static void __exit s3c24xx_led_exit(void)
153{
154 	platform_driver_unregister(&s3c24xx_led_driver);
155}
156
157module_init(s3c24xx_led_init);
158module_exit(s3c24xx_led_exit);
159
160MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
161MODULE_DESCRIPTION("S3C24XX LED driver");
162MODULE_LICENSE("GPL");
163