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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> |
54f4dedb | 20 | #include <linux/module.h> |
54bdc470 | 21 | |
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22 | #include <mach/hardware.h> |
23 | #include <mach/regs-gpio.h> | |
24 | #include <mach/leds-gpio.h> | |
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25 | |
26 | /* our context */ | |
27 | ||
28 | struct s3c24xx_gpio_led { | |
29 | struct led_classdev cdev; | |
30 | struct s3c24xx_led_platdata *pdata; | |
31 | }; | |
32 | ||
33 | static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev) | |
34 | { | |
35 | return platform_get_drvdata(dev); | |
36 | } | |
37 | ||
38 | static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev) | |
39 | { | |
40 | return container_of(led_cdev, struct s3c24xx_gpio_led, cdev); | |
41 | } | |
42 | ||
43 | static void s3c24xx_led_set(struct led_classdev *led_cdev, | |
44 | enum led_brightness value) | |
45 | { | |
46 | struct s3c24xx_gpio_led *led = to_gpio(led_cdev); | |
47 | struct s3c24xx_led_platdata *pd = led->pdata; | |
48 | ||
4a739d55 | 49 | /* there will be a short delay between setting the output and |
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50 | * going from output to input when using tristate. */ |
51 | ||
52 | s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^ | |
53 | (pd->flags & S3C24XX_LEDF_ACTLOW)); | |
54 | ||
55 | if (pd->flags & S3C24XX_LEDF_TRISTATE) | |
56 | s3c2410_gpio_cfgpin(pd->gpio, | |
4d404fd5 | 57 | value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT); |
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58 | |
59 | } | |
60 | ||
61 | static int s3c24xx_led_remove(struct platform_device *dev) | |
62 | { | |
63 | struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); | |
64 | ||
65 | led_classdev_unregister(&led->cdev); | |
66 | kfree(led); | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
71 | static int s3c24xx_led_probe(struct platform_device *dev) | |
72 | { | |
73 | struct s3c24xx_led_platdata *pdata = dev->dev.platform_data; | |
74 | struct s3c24xx_gpio_led *led; | |
75 | int ret; | |
76 | ||
77 | led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL); | |
78 | if (led == NULL) { | |
79 | dev_err(&dev->dev, "No memory for device\n"); | |
80 | return -ENOMEM; | |
81 | } | |
82 | ||
83 | platform_set_drvdata(dev, led); | |
84 | ||
85 | led->cdev.brightness_set = s3c24xx_led_set; | |
86 | led->cdev.default_trigger = pdata->def_trigger; | |
87 | led->cdev.name = pdata->name; | |
859cb7f2 | 88 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; |
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89 | |
90 | led->pdata = pdata; | |
91 | ||
92 | /* no point in having a pull-up if we are always driving */ | |
93 | ||
94 | if (pdata->flags & S3C24XX_LEDF_TRISTATE) { | |
95 | s3c2410_gpio_setpin(pdata->gpio, 0); | |
96 | s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT); | |
97 | } else { | |
98 | s3c2410_gpio_pullup(pdata->gpio, 0); | |
99 | s3c2410_gpio_setpin(pdata->gpio, 0); | |
100 | s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT); | |
101 | } | |
102 | ||
103 | /* register our new led device */ | |
104 | ||
105 | ret = led_classdev_register(&dev->dev, &led->cdev); | |
106 | if (ret < 0) { | |
107 | dev_err(&dev->dev, "led_classdev_register failed\n"); | |
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108 | kfree(led); |
109 | return ret; | |
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110 | } |
111 | ||
112 | return 0; | |
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113 | } |
114 | ||
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115 | static struct platform_driver s3c24xx_led_driver = { |
116 | .probe = s3c24xx_led_probe, | |
117 | .remove = s3c24xx_led_remove, | |
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118 | .driver = { |
119 | .name = "s3c24xx_led", | |
120 | .owner = THIS_MODULE, | |
121 | }, | |
122 | }; | |
123 | ||
892a8843 | 124 | module_platform_driver(s3c24xx_led_driver); |
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125 | |
126 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
127 | MODULE_DESCRIPTION("S3C24XX LED driver"); | |
128 | MODULE_LICENSE("GPL"); | |
3c4ded97 | 129 | MODULE_ALIAS("platform:s3c24xx_led"); |