x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / leds / leds-s3c24xx.c
blob76483fb5ee45e4f04a025265cb75fffc47c7b932
1 /* drivers/leds/leds-s3c24xx.c
3 * (c) 2006 Simtec Electronics
4 * http://armlinux.simtec.co.uk/
5 * Ben Dooks <ben@simtec.co.uk>
7 * S3C24XX - LEDs GPIO driver
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.
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>
22 #include <mach/hardware.h>
23 #include <mach/regs-gpio.h>
24 #include <linux/platform_data/leds-s3c24xx.h>
26 /* our context */
28 struct s3c24xx_gpio_led {
29 struct led_classdev cdev;
30 struct s3c24xx_led_platdata *pdata;
33 static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev)
35 return platform_get_drvdata(dev);
38 static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
40 return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
43 static void s3c24xx_led_set(struct led_classdev *led_cdev,
44 enum led_brightness value)
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);
50 /* there will be a short delay between setting the output and
51 * going from output to input when using tristate. */
53 gpio_set_value(pd->gpio, state);
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);
63 static int s3c24xx_led_remove(struct platform_device *dev)
65 struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
67 led_classdev_unregister(&led->cdev);
69 return 0;
72 static int s3c24xx_led_probe(struct platform_device *dev)
74 struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
75 struct s3c24xx_gpio_led *led;
76 int ret;
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;
85 platform_set_drvdata(dev, led);
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;
92 led->pdata = pdata;
94 ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
95 if (ret < 0)
96 return ret;
98 /* no point in having a pull-up if we are always driving */
100 s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
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);
108 /* register our new led device */
110 ret = led_classdev_register(&dev->dev, &led->cdev);
111 if (ret < 0)
112 dev_err(&dev->dev, "led_classdev_register failed\n");
114 return ret;
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,
126 module_platform_driver(s3c24xx_led_driver);
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");