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Ben Dooks54bdc472006-04-10 22:54:00 -07001/* 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
Ben Dooks54bdc472006-04-10 22:54:00 -070014#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/platform_device.h>
17#include <linux/leds.h>
Ben Dooksec976d62009-05-13 22:52:24 +010018#include <linux/gpio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Ben Dooks54bdc472006-04-10 22:54:00 -070020
Russell Kinga09e64f2008-08-05 16:14:15 +010021#include <mach/hardware.h>
22#include <mach/regs-gpio.h>
23#include <mach/leds-gpio.h>
Ben Dooks54bdc472006-04-10 22:54:00 -070024
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
Uwe Kleine-König4a739d52007-10-20 01:55:58 +020048 /* there will be a short delay between setting the output and
Ben Dooks54bdc472006-04-10 22:54:00 -070049 * going from output to input when using tristate. */
50
51 s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^
52 (pd->flags & S3C24XX_LEDF_ACTLOW));
53
54 if (pd->flags & S3C24XX_LEDF_TRISTATE)
55 s3c2410_gpio_cfgpin(pd->gpio,
Németh Márton4d404fd2008-03-09 20:59:57 +000056 value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT);
Ben Dooks54bdc472006-04-10 22:54:00 -070057
58}
59
60static int s3c24xx_led_remove(struct platform_device *dev)
61{
62 struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
63
64 led_classdev_unregister(&led->cdev);
65 kfree(led);
66
67 return 0;
68}
69
70static int s3c24xx_led_probe(struct platform_device *dev)
71{
72 struct s3c24xx_led_platdata *pdata = dev->dev.platform_data;
73 struct s3c24xx_gpio_led *led;
74 int ret;
75
76 led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL);
77 if (led == NULL) {
78 dev_err(&dev->dev, "No memory for device\n");
79 return -ENOMEM;
80 }
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;
Richard Purdie859cb7f2009-01-08 17:55:03 +000087 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
Ben Dooks54bdc472006-04-10 22:54:00 -070088
89 led->pdata = pdata;
90
91 /* no point in having a pull-up if we are always driving */
92
93 if (pdata->flags & S3C24XX_LEDF_TRISTATE) {
94 s3c2410_gpio_setpin(pdata->gpio, 0);
95 s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);
96 } else {
97 s3c2410_gpio_pullup(pdata->gpio, 0);
98 s3c2410_gpio_setpin(pdata->gpio, 0);
99 s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);
100 }
101
102 /* register our new led device */
103
104 ret = led_classdev_register(&dev->dev, &led->cdev);
105 if (ret < 0) {
106 dev_err(&dev->dev, "led_classdev_register failed\n");
Zhenwen Xubfb2cc42009-04-03 15:35:52 +0100107 kfree(led);
108 return ret;
Ben Dooks54bdc472006-04-10 22:54:00 -0700109 }
110
111 return 0;
Ben Dooks54bdc472006-04-10 22:54:00 -0700112}
113
Ben Dooks54bdc472006-04-10 22:54:00 -0700114static struct platform_driver s3c24xx_led_driver = {
115 .probe = s3c24xx_led_probe,
116 .remove = s3c24xx_led_remove,
Ben Dooks54bdc472006-04-10 22:54:00 -0700117 .driver = {
118 .name = "s3c24xx_led",
119 .owner = THIS_MODULE,
120 },
121};
122
123static int __init s3c24xx_led_init(void)
124{
125 return platform_driver_register(&s3c24xx_led_driver);
126}
127
128static void __exit s3c24xx_led_exit(void)
129{
Németh Márton4d404fd2008-03-09 20:59:57 +0000130 platform_driver_unregister(&s3c24xx_led_driver);
Ben Dooks54bdc472006-04-10 22:54:00 -0700131}
132
133module_init(s3c24xx_led_init);
134module_exit(s3c24xx_led_exit);
135
136MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
137MODULE_DESCRIPTION("S3C24XX LED driver");
138MODULE_LICENSE("GPL");
Kay Sievers3c4ded92008-04-15 14:34:30 -0700139MODULE_ALIAS("platform:s3c24xx_led");