release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/leds/leds-wrap.c

   1 /*
   2  * LEDs driver for PCEngines WRAP
   3  *
   4  * Copyright (C) 2006 Kristian Kielhofner <kris@krisk.org>
   5  *
   6  * Based on leds-net48xx.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/leds.h>
  17 #include <linux/err.h>
  18 #include <asm/io.h>
  19 #include <linux/scx200_gpio.h>
  20
  21 #define DRVNAME "wrap-led"
  22 #define WRAP_POWER_LED_GPIO     2
  23 #define WRAP_ERROR_LED_GPIO     3
  24 #define WRAP_EXTRA_LED_GPIO     18
  25
  26 static struct platform_device *pdev;
  27
  28 static void wrap_power_led_set(struct led_classdev *led_cdev,
  29                 enum led_brightness value)
  30 {
  31         if (value)
  32                 scx200_gpio_set_low(WRAP_POWER_LED_GPIO);
  33         else
  34                 scx200_gpio_set_high(WRAP_POWER_LED_GPIO);
  35 }
  36
  37 static void wrap_error_led_set(struct led_classdev *led_cdev,
  38                 enum led_brightness value)
  39 {
  40         if (value)
  41                 scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
  42         else
  43                 scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
  44 }
  45
  46 static void wrap_extra_led_set(struct led_classdev *led_cdev,
  47                 enum led_brightness value)
  48 {
  49         if (value)
  50                 scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
  51         else
  52                 scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
  53 }
  54
  55 static struct led_classdev wrap_power_led = {
  56         .name                   = "wrap::power",
  57         .brightness_set         = wrap_power_led_set,
  58         .default_trigger        = "default-on",
  59         .flags                  = LED_CORE_SUSPENDRESUME,
  60 };
  61
  62 static struct led_classdev wrap_error_led = {
  63         .name           = "wrap::error",
  64         .brightness_set = wrap_error_led_set,
  65         .flags                  = LED_CORE_SUSPENDRESUME,
  66 };
  67
  68 static struct led_classdev wrap_extra_led = {
  69         .name           = "wrap::extra",
  70         .brightness_set = wrap_extra_led_set,
  71         .flags                  = LED_CORE_SUSPENDRESUME,
  72 };
  73
  74 static int wrap_led_probe(struct platform_device *pdev)
  75 {
  76         int ret;
  77
  78         ret = led_classdev_register(&pdev->dev, &wrap_power_led);
  79         if (ret < 0)
  80                 return ret;
  81
  82         ret = led_classdev_register(&pdev->dev, &wrap_error_led);
  83         if (ret < 0)
  84                 goto err1;
  85
  86         ret = led_classdev_register(&pdev->dev, &wrap_extra_led);
  87         if (ret < 0)
  88                 goto err2;
  89
  90         return ret;
  91
  92 err2:
  93         led_classdev_unregister(&wrap_error_led);
  94 err1:
  95         led_classdev_unregister(&wrap_power_led);
  96
  97         return ret;
  98 }
  99
 100 static int wrap_led_remove(struct platform_device *pdev)
 101 {
 102         led_classdev_unregister(&wrap_power_led);
 103         led_classdev_unregister(&wrap_error_led);
 104         led_classdev_unregister(&wrap_extra_led);
 105         return 0;
 106 }
 107
 108 static struct platform_driver wrap_led_driver = {
 109         .probe          = wrap_led_probe,
 110         .remove         = wrap_led_remove,
 111         .driver         = {
 112                 .name           = DRVNAME,
 113                 .owner          = THIS_MODULE,
 114         },
 115 };
 116
 117 static int __init wrap_led_init(void)
 118 {
 119         int ret;
 120
 121         if (!scx200_gpio_present()) {
 122                 ret = -ENODEV;
 123                 goto out;
 124         }
 125
 126         ret = platform_driver_register(&wrap_led_driver);
 127         if (ret < 0)
 128                 goto out;
 129
 130         pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
 131         if (IS_ERR(pdev)) {
 132                 ret = PTR_ERR(pdev);
 133                 platform_driver_unregister(&wrap_led_driver);
 134                 goto out;
 135         }
 136
 137 out:
 138         return ret;
 139 }
 140
 141 static void __exit wrap_led_exit(void)
 142 {
 143         platform_device_unregister(pdev);
 144         platform_driver_unregister(&wrap_led_driver);
 145 }
 146
 147 module_init(wrap_led_init);
 148 module_exit(wrap_led_exit);
 149
 150 MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
 151 MODULE_DESCRIPTION("PCEngines WRAP LED driver");
 152 MODULE_LICENSE("GPL");