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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 | ||
54bdc470 | 14 | #include <linux/kernel.h> |
54bdc470 BD |
15 | #include <linux/platform_device.h> |
16 | #include <linux/leds.h> | |
ec976d6e | 17 | #include <linux/gpio.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
54f4dedb | 19 | #include <linux/module.h> |
3cb6f44a | 20 | #include <linux/platform_data/leds-s3c24xx.h> |
54bdc470 | 21 | |
a09e64fb | 22 | #include <mach/regs-gpio.h> |
224feb33 | 23 | #include <plat/gpio-cfg.h> |
54bdc470 BD |
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; | |
7d84f66f | 47 | int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW); |
54bdc470 | 48 | |
4a739d55 | 49 | /* there will be a short delay between setting the output and |
54bdc470 BD |
50 | * going from output to input when using tristate. */ |
51 | ||
7d84f66f | 52 | gpio_set_value(pd->gpio, state); |
54bdc470 | 53 | |
7d84f66f SN |
54 | if (pd->flags & S3C24XX_LEDF_TRISTATE) { |
55 | if (value) | |
56 | gpio_direction_output(pd->gpio, state); | |
57 | else | |
58 | gpio_direction_input(pd->gpio); | |
59 | } | |
54bdc470 BD |
60 | } |
61 | ||
62 | static int s3c24xx_led_remove(struct platform_device *dev) | |
63 | { | |
64 | struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); | |
65 | ||
66 | led_classdev_unregister(&led->cdev); | |
54bdc470 BD |
67 | |
68 | return 0; | |
69 | } | |
70 | ||
71 | static int s3c24xx_led_probe(struct platform_device *dev) | |
72 | { | |
87aae1ea | 73 | struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev); |
54bdc470 BD |
74 | struct s3c24xx_gpio_led *led; |
75 | int ret; | |
76 | ||
7e97b581 SN |
77 | led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led), |
78 | GFP_KERNEL); | |
0c9a03b6 | 79 | if (!led) |
54bdc470 | 80 | return -ENOMEM; |
54bdc470 BD |
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; |
54bdc470 BD |
88 | |
89 | led->pdata = pdata; | |
90 | ||
5ecf6e40 | 91 | ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED"); |
7d84f66f SN |
92 | if (ret < 0) |
93 | return ret; | |
94 | ||
54bdc470 BD |
95 | /* no point in having a pull-up if we are always driving */ |
96 | ||
7d84f66f SN |
97 | s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE); |
98 | ||
99 | if (pdata->flags & S3C24XX_LEDF_TRISTATE) | |
100 | gpio_direction_input(pdata->gpio); | |
101 | else | |
102 | gpio_direction_output(pdata->gpio, | |
103 | pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0); | |
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104 | |
105 | /* register our new led device */ | |
106 | ||
107 | ret = led_classdev_register(&dev->dev, &led->cdev); | |
7e97b581 | 108 | if (ret < 0) |
54bdc470 | 109 | dev_err(&dev->dev, "led_classdev_register failed\n"); |
54bdc470 | 110 | |
1522d02e | 111 | return ret; |
54bdc470 BD |
112 | } |
113 | ||
54bdc470 BD |
114 | static struct platform_driver s3c24xx_led_driver = { |
115 | .probe = s3c24xx_led_probe, | |
116 | .remove = s3c24xx_led_remove, | |
54bdc470 BD |
117 | .driver = { |
118 | .name = "s3c24xx_led", | |
54bdc470 BD |
119 | }, |
120 | }; | |
121 | ||
892a8843 | 122 | module_platform_driver(s3c24xx_led_driver); |
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123 | |
124 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
125 | MODULE_DESCRIPTION("S3C24XX LED driver"); | |
126 | MODULE_LICENSE("GPL"); | |
3c4ded97 | 127 | MODULE_ALIAS("platform:s3c24xx_led"); |