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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 | ||
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14 | #include <linux/kernel.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/leds.h> | |
ec976d6e | 18 | #include <linux/gpio.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
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21 | #include <mach/hardware.h> |
22 | #include <mach/regs-gpio.h> | |
23 | #include <mach/leds-gpio.h> | |
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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 | ||
4a739d55 | 48 | /* there will be a short delay between setting the output and |
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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, | |
4d404fd5 | 56 | value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT); |
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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; | |
859cb7f2 | 87 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; |
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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"); | |
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107 | kfree(led); |
108 | return ret; | |
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109 | } |
110 | ||
111 | return 0; | |
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112 | } |
113 | ||
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114 | static struct platform_driver s3c24xx_led_driver = { |
115 | .probe = s3c24xx_led_probe, | |
116 | .remove = s3c24xx_led_remove, | |
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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 | { | |
4d404fd5 | 130 | platform_driver_unregister(&s3c24xx_led_driver); |
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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"); | |
3c4ded97 | 139 | MODULE_ALIAS("platform:s3c24xx_led"); |