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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 | #include <linux/module.h> |
21 | |
22 | #include <mach/hardware.h> |
23 | #include <mach/regs-gpio.h> |
24 | #include <linux/platform_data/leds-s3c24xx.h> |
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 | int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW); |
49 | |
50 | /* there will be a short delay between setting the output and |
51 | * going from output to input when using tristate. */ |
52 | |
53 | gpio_set_value(pd->gpio, state); |
54 | |
55 | if (pd->flags & S3C24XX_LEDF_TRISTATE) { |
56 | if (value) |
57 | gpio_direction_output(pd->gpio, state); |
58 | else |
59 | gpio_direction_input(pd->gpio); |
60 | } |
61 | } |
62 | |
63 | static int s3c24xx_led_remove(struct platform_device *dev) |
64 | { |
65 | struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); |
66 | |
67 | led_classdev_unregister(&led->cdev); |
68 | |
69 | return 0; |
70 | } |
71 | |
72 | static int s3c24xx_led_probe(struct platform_device *dev) |
73 | { |
74 | struct s3c24xx_led_platdata *pdata = dev->dev.platform_data; |
75 | struct s3c24xx_gpio_led *led; |
76 | int ret; |
77 | |
78 | led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led), |
79 | GFP_KERNEL); |
80 | if (led == NULL) { |
81 | dev_err(&dev->dev, "No memory for device\n"); |
82 | return -ENOMEM; |
83 | } |
84 | |
85 | platform_set_drvdata(dev, led); |
86 | |
87 | led->cdev.brightness_set = s3c24xx_led_set; |
88 | led->cdev.default_trigger = pdata->def_trigger; |
89 | led->cdev.name = pdata->name; |
90 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; |
91 | |
92 | led->pdata = pdata; |
93 | |
94 | ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED"); |
95 | if (ret < 0) |
96 | return ret; |
97 | |
98 | /* no point in having a pull-up if we are always driving */ |
99 | |
100 | s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE); |
101 | |
102 | if (pdata->flags & S3C24XX_LEDF_TRISTATE) |
103 | gpio_direction_input(pdata->gpio); |
104 | else |
105 | gpio_direction_output(pdata->gpio, |
106 | pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0); |
107 | |
108 | /* register our new led device */ |
109 | |
110 | ret = led_classdev_register(&dev->dev, &led->cdev); |
111 | if (ret < 0) |
112 | dev_err(&dev->dev, "led_classdev_register failed\n"); |
113 | |
114 | return ret; |
115 | } |
116 | |
117 | static struct platform_driver s3c24xx_led_driver = { |
118 | .probe = s3c24xx_led_probe, |
119 | .remove = s3c24xx_led_remove, |
120 | .driver = { |
121 | .name = "s3c24xx_led", |
122 | .owner = THIS_MODULE, |
123 | }, |
124 | }; |
125 | |
126 | module_platform_driver(s3c24xx_led_driver); |
127 | |
128 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); |
129 | MODULE_DESCRIPTION("S3C24XX LED driver"); |
130 | MODULE_LICENSE("GPL"); |
131 | MODULE_ALIAS("platform:s3c24xx_led"); |
132 |
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