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
25 struct s3c24xx_gpio_led {
26 struct led_classdev cdev;
27 struct s3c24xx_led_platdata *pdata;
28 };
29
30 static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev)
31 {
32 return platform_get_drvdata(dev);
33 }
34
35 static 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
40 static 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
58 static 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
68 static 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
116 static 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
124 static 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
136 static 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
147 static int __init s3c24xx_led_init(void)
148 {
149 return platform_driver_register(&s3c24xx_led_driver);
150 }
151
152 static void __exit s3c24xx_led_exit(void)
153 {
154 platform_driver_unregister(&s3c24xx_led_driver);
155 }
156
157 module_init(s3c24xx_led_init);
158 module_exit(s3c24xx_led_exit);
159
160 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
161 MODULE_DESCRIPTION("S3C24XX LED driver");
162 MODULE_LICENSE("GPL");
163 MODULE_ALIAS("platform:s3c24xx_led");
164
|
This page was automatically generated by the
LXR engine.
|