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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> | |
18 | ||
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19 | #include <mach/hardware.h> |
20 | #include <mach/regs-gpio.h> | |
21 | #include <mach/leds-gpio.h> | |
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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 | ||
4a739d55 | 46 | /* there will be a short delay between setting the output and |
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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, | |
4d404fd5 | 54 | value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT); |
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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; | |
859cb7f2 | 85 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; |
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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"); | |
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105 | kfree(led); |
106 | return ret; | |
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107 | } |
108 | ||
109 | return 0; | |
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110 | } |
111 | ||
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112 | static struct platform_driver s3c24xx_led_driver = { |
113 | .probe = s3c24xx_led_probe, | |
114 | .remove = s3c24xx_led_remove, | |
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115 | .driver = { |
116 | .name = "s3c24xx_led", | |
117 | .owner = THIS_MODULE, | |
118 | }, | |
119 | }; | |
120 | ||
121 | static int __init s3c24xx_led_init(void) | |
122 | { | |
123 | return platform_driver_register(&s3c24xx_led_driver); | |
124 | } | |
125 | ||
126 | static void __exit s3c24xx_led_exit(void) | |
127 | { | |
4d404fd5 | 128 | platform_driver_unregister(&s3c24xx_led_driver); |
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129 | } |
130 | ||
131 | module_init(s3c24xx_led_init); | |
132 | module_exit(s3c24xx_led_exit); | |
133 | ||
134 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
135 | MODULE_DESCRIPTION("S3C24XX LED driver"); | |
136 | MODULE_LICENSE("GPL"); | |
3c4ded97 | 137 | MODULE_ALIAS("platform:s3c24xx_led"); |