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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 | #include <linux/gpio.h> |
19 | #include <linux/slab.h> |
20 | |
21 | #include <mach/hardware.h> |
22 | #include <mach/regs-gpio.h> |
23 | #include <mach/leds-gpio.h> |
24 | |
25 | /* our context */ |
26 | |
27 | struct s3c24xx_gpio_led { |
28 | struct led_classdev cdev; |
29 | struct s3c24xx_led_platdata *pdata; |
30 | }; |
31 | |
32 | static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev) |
33 | { |
34 | return platform_get_drvdata(dev); |
35 | } |
36 | |
37 | static 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 | |
42 | static 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 | |
48 | /* there will be a short delay between setting the output and |
49 | * 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, |
56 | value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT); |
57 | |
58 | } |
59 | |
60 | static 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 | |
70 | static 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; |
87 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; |
88 | |
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"); |
107 | kfree(led); |
108 | return ret; |
109 | } |
110 | |
111 | return 0; |
112 | } |
113 | |
114 | static struct platform_driver s3c24xx_led_driver = { |
115 | .probe = s3c24xx_led_probe, |
116 | .remove = s3c24xx_led_remove, |
117 | .driver = { |
118 | .name = "s3c24xx_led", |
119 | .owner = THIS_MODULE, |
120 | }, |
121 | }; |
122 | |
123 | static int __init s3c24xx_led_init(void) |
124 | { |
125 | return platform_driver_register(&s3c24xx_led_driver); |
126 | } |
127 | |
128 | static void __exit s3c24xx_led_exit(void) |
129 | { |
130 | platform_driver_unregister(&s3c24xx_led_driver); |
131 | } |
132 | |
133 | module_init(s3c24xx_led_init); |
134 | module_exit(s3c24xx_led_exit); |
135 | |
136 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); |
137 | MODULE_DESCRIPTION("S3C24XX LED driver"); |
138 | MODULE_LICENSE("GPL"); |
139 | MODULE_ALIAS("platform:s3c24xx_led"); |
140 |
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