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 #include <linux/module.h>
  21
  22 #define DRVNAME "wrap-led"
  23 #define WRAP_POWER_LED_GPIO     2
  24 #define WRAP_ERROR_LED_GPIO     3
  25 #define WRAP_EXTRA_LED_GPIO     18
  26
  27 static struct platform_device *pdev;
  28
  29 static void wrap_power_led_set(struct led_classdev *led_cdev,
  30                 enum led_brightness value)
  31 {
  32         if (value)
  33                 scx200_gpio_set_low(WRAP_POWER_LED_GPIO);
  34         else
  35                 scx200_gpio_set_high(WRAP_POWER_LED_GPIO);
  36 }
  37
  38 static void wrap_error_led_set(struct led_classdev *led_cdev,
  39                 enum led_brightness value)
  40 {
  41         if (value)
  42                 scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
  43         else
  44                 scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
  45 }
  46
  47 static void wrap_extra_led_set(struct led_classdev *led_cdev,
  48                 enum led_brightness value)
  49 {
  50         if (value)
  51                 scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
  52         else
  53                 scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
  54 }
  55
  56 static struct led_classdev wrap_power_led = {
  57         .name                   = "wrap::power",
  58         .brightness_set         = wrap_power_led_set,
  59         .default_trigger        = "default-on",
  60         .flags                  = LED_CORE_SUSPENDRESUME,
  61 };
  62
  63 static struct led_classdev wrap_error_led = {
  64         .name           = "wrap::error",
  65         .brightness_set = wrap_error_led_set,
  66         .flags                  = LED_CORE_SUSPENDRESUME,
  67 };
  68
  69 static struct led_classdev wrap_extra_led = {
  70         .name           = "wrap::extra",
  71         .brightness_set = wrap_extra_led_set,
  72         .flags                  = LED_CORE_SUSPENDRESUME,
  73 };
  74
  75 static int wrap_led_probe(struct platform_device *pdev)
  76 {
  77         int ret;
  78
  79         ret = led_classdev_register(&pdev->dev, &wrap_power_led);
  80         if (ret < 0)
  81                 return ret;
  82
  83         ret = led_classdev_register(&pdev->dev, &wrap_error_led);
  84         if (ret < 0)
  85                 goto err1;
  86
  87         ret = led_classdev_register(&pdev->dev, &wrap_extra_led);
  88         if (ret < 0)
  89                 goto err2;
  90
  91         return ret;
  92
  93 err2:
  94         led_classdev_unregister(&wrap_error_led);
  95 err1:
  96         led_classdev_unregister(&wrap_power_led);
  97
  98         return ret;
  99 }
 100
 101 static int wrap_led_remove(struct platform_device *pdev)
 102 {
 103         led_classdev_unregister(&wrap_power_led);
 104         led_classdev_unregister(&wrap_error_led);
 105         led_classdev_unregister(&wrap_extra_led);
 106         return 0;
 107 }
 108
 109 static struct platform_driver wrap_led_driver = {
 110         .probe          = wrap_led_probe,
 111         .remove         = wrap_led_remove,
 112         .driver         = {
 113                 .name           = DRVNAME,
 114                 .owner          = THIS_MODULE,
 115         },
 116 };
 117
 118 static int __init wrap_led_init(void)
 119 {
 120         int ret;
 121
 122         if (!scx200_gpio_present()) {
 123                 ret = -ENODEV;
 124                 goto out;
 125         }
 126
 127         ret = platform_driver_register(&wrap_led_driver);
 128         if (ret < 0)
 129                 goto out;
 130
 131         pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
 132         if (IS_ERR(pdev)) {
 133                 ret = PTR_ERR(pdev);
 134                 platform_driver_unregister(&wrap_led_driver);
 135                 goto out;
 136         }
 137
 138 out:
 139         return ret;
 140 }
 141
 142 static void __exit wrap_led_exit(void)
 143 {
 144         platform_device_unregister(pdev);
 145         platform_driver_unregister(&wrap_led_driver);
 146 }
 147
 148 module_init(wrap_led_init);
 149 module_exit(wrap_led_exit);
 150
 151 MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
 152 MODULE_DESCRIPTION("PCEngines WRAP LED driver");
 153 MODULE_LICENSE("GPL");
 154