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54bdc470 BD |
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 | ||
54bdc470 BD |
32 | static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev) |
33 | { | |
34 | return container_of(led_cdev, struct s3c24xx_gpio_led, cdev); | |
35 | } | |
36 | ||
37 | static void s3c24xx_led_set(struct led_classdev *led_cdev, | |
38 | enum led_brightness value) | |
39 | { | |
40 | struct s3c24xx_gpio_led *led = to_gpio(led_cdev); | |
41 | struct s3c24xx_led_platdata *pd = led->pdata; | |
7d84f66f | 42 | int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW); |
54bdc470 | 43 | |
4a739d55 | 44 | /* there will be a short delay between setting the output and |
54bdc470 BD |
45 | * going from output to input when using tristate. */ |
46 | ||
7d84f66f | 47 | gpio_set_value(pd->gpio, state); |
54bdc470 | 48 | |
7d84f66f SN |
49 | if (pd->flags & S3C24XX_LEDF_TRISTATE) { |
50 | if (value) | |
51 | gpio_direction_output(pd->gpio, state); | |
52 | else | |
53 | gpio_direction_input(pd->gpio); | |
54 | } | |
54bdc470 BD |
55 | } |
56 | ||
54bdc470 BD |
57 | static int s3c24xx_led_probe(struct platform_device *dev) |
58 | { | |
87aae1ea | 59 | struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev); |
54bdc470 BD |
60 | struct s3c24xx_gpio_led *led; |
61 | int ret; | |
62 | ||
7e97b581 SN |
63 | led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led), |
64 | GFP_KERNEL); | |
0c9a03b6 | 65 | if (!led) |
54bdc470 | 66 | return -ENOMEM; |
54bdc470 | 67 | |
54bdc470 BD |
68 | led->cdev.brightness_set = s3c24xx_led_set; |
69 | led->cdev.default_trigger = pdata->def_trigger; | |
70 | led->cdev.name = pdata->name; | |
859cb7f2 | 71 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; |
54bdc470 BD |
72 | |
73 | led->pdata = pdata; | |
74 | ||
5ecf6e40 | 75 | ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED"); |
7d84f66f SN |
76 | if (ret < 0) |
77 | return ret; | |
78 | ||
54bdc470 BD |
79 | /* no point in having a pull-up if we are always driving */ |
80 | ||
7d84f66f SN |
81 | s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE); |
82 | ||
83 | if (pdata->flags & S3C24XX_LEDF_TRISTATE) | |
84 | gpio_direction_input(pdata->gpio); | |
85 | else | |
86 | gpio_direction_output(pdata->gpio, | |
87 | pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0); | |
54bdc470 BD |
88 | |
89 | /* register our new led device */ | |
90 | ||
48a7032b | 91 | ret = devm_led_classdev_register(&dev->dev, &led->cdev); |
7e97b581 | 92 | if (ret < 0) |
54bdc470 | 93 | dev_err(&dev->dev, "led_classdev_register failed\n"); |
54bdc470 | 94 | |
1522d02e | 95 | return ret; |
54bdc470 BD |
96 | } |
97 | ||
54bdc470 BD |
98 | static struct platform_driver s3c24xx_led_driver = { |
99 | .probe = s3c24xx_led_probe, | |
54bdc470 BD |
100 | .driver = { |
101 | .name = "s3c24xx_led", | |
54bdc470 BD |
102 | }, |
103 | }; | |
104 | ||
892a8843 | 105 | module_platform_driver(s3c24xx_led_driver); |
54bdc470 BD |
106 | |
107 | MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); | |
108 | MODULE_DESCRIPTION("S3C24XX LED driver"); | |
109 | MODULE_LICENSE("GPL"); | |
3c4ded97 | 110 | MODULE_ALIAS("platform:s3c24xx_led"); |