LXR linux/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
  26static struct platform_device *pdev;
  27
  28static 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
  37static 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
  46static 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
  55static 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
  62static struct led_classdev wrap_error_led = {
  63        .name           = "wrap::error",
  64        .brightness_set = wrap_error_led_set,
  65        .flags                  = LED_CORE_SUSPENDRESUME,
  66};
  67
  68static struct led_classdev wrap_extra_led = {
  69        .name           = "wrap::extra",
  70        .brightness_set = wrap_extra_led_set,
  71        .flags                  = LED_CORE_SUSPENDRESUME,
  72};
  73
  74static 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
  92err2:
  93        led_classdev_unregister(&wrap_error_led);
  94err1:
  95        led_classdev_unregister(&wrap_power_led);
  96
  97        return ret;
  98}
  99
 100static 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
 108static 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
 117static 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
 137out:
 138        return ret;
 139}
 140
 141static void __exit wrap_led_exit(void)
 142{
 143        platform_device_unregister(pdev);
 144        platform_driver_unregister(&wrap_led_driver);
 145}
 146
 147module_init(wrap_led_init);
 148module_exit(wrap_led_exit);
 149
 150MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
 151MODULE_DESCRIPTION("PCEngines WRAP LED driver");
 152MODULE_LICENSE("GPL");
 153
 154