tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 <mach/hardware.h>
20#include <mach/regs-gpio.h>
21#include <mach/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 short 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 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
86
87 led->pdata = pdata;
88
89 /* no point in having a pull-up if we are always driving */
90
91 if (pdata->flags & S3C24XX_LEDF_TRISTATE) {
92 s3c2410_gpio_setpin(pdata->gpio, 0);
93 s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);
94 } else {
95 s3c2410_gpio_pullup(pdata->gpio, 0);
96 s3c2410_gpio_setpin(pdata->gpio, 0);
97 s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);
98 }
99
100 /* register our new led device */
101
102 ret = led_classdev_register(&dev->dev, &led->cdev);
103 if (ret < 0) {
104 dev_err(&dev->dev, "led_classdev_register failed\n");
105 kfree(led);
106 return ret;
107 }
108
109 return 0;
110}
111
112static struct platform_driver s3c24xx_led_driver = {
113 .probe = s3c24xx_led_probe,
114 .remove = s3c24xx_led_remove,
115 .driver = {
116 .name = "s3c24xx_led",
117 .owner = THIS_MODULE,
118 },
119};
120
121static int __init s3c24xx_led_init(void)
122{
123 return platform_driver_register(&s3c24xx_led_driver);
124}
125
126static void __exit s3c24xx_led_exit(void)
127{
128 platform_driver_unregister(&s3c24xx_led_driver);
129}
130
131module_init(s3c24xx_led_init);
132module_exit(s3c24xx_led_exit);
133
134MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
135MODULE_DESCRIPTION("S3C24XX LED driver");
136MODULE_LICENSE("GPL");
137MODULE_ALIAS("platform:s3c24xx_led");