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Linux/drivers/leds/leds-s3c24xx.c

  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/platform_device.h>
 16 #include <linux/leds.h>
 17 #include <linux/gpio.h>
 18 #include <linux/slab.h>
 19 #include <linux/module.h>
 20 #include <linux/platform_data/leds-s3c24xx.h>
 21 
 22 #include <mach/regs-gpio.h>
 23 #include <plat/gpio-cfg.h>
 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;
 47         int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);
 48 
 49         /* there will be a short delay between setting the output and
 50          * going from output to input when using tristate. */
 51 
 52         gpio_set_value(pd->gpio, state);
 53 
 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         }
 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);
 67 
 68         return 0;
 69 }
 70 
 71 static int s3c24xx_led_probe(struct platform_device *dev)
 72 {
 73         struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
 74         struct s3c24xx_gpio_led *led;
 75         int ret;
 76 
 77         led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
 78                            GFP_KERNEL);
 79         if (!led)
 80                 return -ENOMEM;
 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;
 87         led->cdev.flags |= LED_CORE_SUSPENDRESUME;
 88 
 89         led->pdata = pdata;
 90 
 91         ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
 92         if (ret < 0)
 93                 return ret;
 94 
 95         /* no point in having a pull-up if we are always driving */
 96 
 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);
104 
105         /* register our new led device */
106 
107         ret = led_classdev_register(&dev->dev, &led->cdev);
108         if (ret < 0)
109                 dev_err(&dev->dev, "led_classdev_register failed\n");
110 
111         return ret;
112 }
113 
114 static struct platform_driver s3c24xx_led_driver = {
115         .probe          = s3c24xx_led_probe,
116         .remove         = s3c24xx_led_remove,
117         .driver         = {
118                 .name           = "s3c24xx_led",
119                 .owner          = THIS_MODULE,
120         },
121 };
122 
123 module_platform_driver(s3c24xx_led_driver);
124 
125 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
126 MODULE_DESCRIPTION("S3C24XX LED driver");
127 MODULE_LICENSE("GPL");
128 MODULE_ALIAS("platform:s3c24xx_led");
129 

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