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/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 == NULL) {
80 dev_err(&dev->dev, "No memory for device\n");
81 return -ENOMEM;
82 }
83
84 platform_set_drvdata(dev, led);
85
86 led->cdev.brightness_set = s3c24xx_led_set;
87 led->cdev.default_trigger = pdata->def_trigger;
88 led->cdev.name = pdata->name;
89 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
90
91 led->pdata = pdata;
92
93 ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
94 if (ret < 0)
95 return ret;
96
97 /* no point in having a pull-up if we are always driving */
98
99 s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
100
101 if (pdata->flags & S3C24XX_LEDF_TRISTATE)
102 gpio_direction_input(pdata->gpio);
103 else
104 gpio_direction_output(pdata->gpio,
105 pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0);
106
107 /* register our new led device */
108
109 ret = led_classdev_register(&dev->dev, &led->cdev);
110 if (ret < 0)
111 dev_err(&dev->dev, "led_classdev_register failed\n");
112
113 return ret;
114}
115
116static struct platform_driver s3c24xx_led_driver = {
117 .probe = s3c24xx_led_probe,
118 .remove = s3c24xx_led_remove,
119 .driver = {
120 .name = "s3c24xx_led",
121 .owner = THIS_MODULE,
122 },
123};
124
125module_platform_driver(s3c24xx_led_driver);
126
127MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
128MODULE_DESCRIPTION("S3C24XX LED driver");
129MODULE_LICENSE("GPL");
130MODULE_ALIAS("platform:s3c24xx_led");