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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/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 #include <linux/platform_data/leds-s3c24xx.h>
 22 
 23 #include <mach/regs-gpio.h>
 24 #include <plat/gpio-cfg.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_get_platdata(&dev->dev);
 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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