linux/drivers/leds/leds-net48xx.c
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   1/*
   2 * LEDs driver for Soekris net48xx
   3 *
   4 * Copyright (C) 2006 Chris Boot <bootc@bootc.net>
   5 *
   6 * Based on leds-ams-delta.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/nsc_gpio.h>
  20#include <linux/scx200_gpio.h>
  21#include <linux/module.h>
  22
  23#define DRVNAME "net48xx-led"
  24#define NET48XX_ERROR_LED_GPIO  20
  25
  26static struct platform_device *pdev;
  27
  28static void net48xx_error_led_set(struct led_classdev *led_cdev,
  29                enum led_brightness value)
  30{
  31        scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
  32}
  33
  34static struct led_classdev net48xx_error_led = {
  35        .name           = "net48xx::error",
  36        .brightness_set = net48xx_error_led_set,
  37        .flags          = LED_CORE_SUSPENDRESUME,
  38};
  39
  40static int net48xx_led_probe(struct platform_device *pdev)
  41{
  42        return led_classdev_register(&pdev->dev, &net48xx_error_led);
  43}
  44
  45static int net48xx_led_remove(struct platform_device *pdev)
  46{
  47        led_classdev_unregister(&net48xx_error_led);
  48        return 0;
  49}
  50
  51static struct platform_driver net48xx_led_driver = {
  52        .probe          = net48xx_led_probe,
  53        .remove         = net48xx_led_remove,
  54        .driver         = {
  55                .name           = DRVNAME,
  56                .owner          = THIS_MODULE,
  57        },
  58};
  59
  60static int __init net48xx_led_init(void)
  61{
  62        int ret;
  63
  64        /* small hack, but scx200_gpio doesn't set .dev if the probe fails */
  65        if (!scx200_gpio_ops.dev) {
  66                ret = -ENODEV;
  67                goto out;
  68        }
  69
  70        ret = platform_driver_register(&net48xx_led_driver);
  71        if (ret < 0)
  72                goto out;
  73
  74        pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
  75        if (IS_ERR(pdev)) {
  76                ret = PTR_ERR(pdev);
  77                platform_driver_unregister(&net48xx_led_driver);
  78                goto out;
  79        }
  80
  81out:
  82        return ret;
  83}
  84
  85static void __exit net48xx_led_exit(void)
  86{
  87        platform_device_unregister(pdev);
  88        platform_driver_unregister(&net48xx_led_driver);
  89}
  90
  91module_init(net48xx_led_init);
  92module_exit(net48xx_led_exit);
  93
  94MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
  95MODULE_DESCRIPTION("Soekris net48xx LED driver");
  96MODULE_LICENSE("GPL");
  97
  98
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