linux/drivers/leds/leds-wrap.c
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   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 <linux/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
  27static struct platform_device *pdev;
  28
  29static 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
  38static 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
  47static 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
  56static 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
  63static struct led_classdev wrap_error_led = {
  64        .name           = "wrap::error",
  65        .brightness_set = wrap_error_led_set,
  66        .flags                  = LED_CORE_SUSPENDRESUME,
  67};
  68
  69static struct led_classdev wrap_extra_led = {
  70        .name           = "wrap::extra",
  71        .brightness_set = wrap_extra_led_set,
  72        .flags                  = LED_CORE_SUSPENDRESUME,
  73};
  74
  75static 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
  93err2:
  94        led_classdev_unregister(&wrap_error_led);
  95err1:
  96        led_classdev_unregister(&wrap_power_led);
  97
  98        return ret;
  99}
 100
 101static 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
 109static 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
 118static 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
 138out:
 139        return ret;
 140}
 141
 142static void __exit wrap_led_exit(void)
 143{
 144        platform_device_unregister(pdev);
 145        platform_driver_unregister(&wrap_led_driver);
 146}
 147
 148module_init(wrap_led_init);
 149module_exit(wrap_led_exit);
 150
 151MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
 152MODULE_DESCRIPTION("PCEngines WRAP LED driver");
 153MODULE_LICENSE("GPL");
 154
 155
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