LXR linux/drivers/leds/leds-net48xx.c

   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 devm_led_classdev_register(&pdev->dev, &net48xx_error_led);
  43}
  44
  45static struct platform_driver net48xx_led_driver = {
  46        .probe          = net48xx_led_probe,
  47        .driver         = {
  48                .name           = DRVNAME,
  49        },
  50};
  51
  52static int __init net48xx_led_init(void)
  53{
  54        int ret;
  55
  56        /* small hack, but scx200_gpio doesn't set .dev if the probe fails */
  57        if (!scx200_gpio_ops.dev) {
  58                ret = -ENODEV;
  59                goto out;
  60        }
  61
  62        ret = platform_driver_register(&net48xx_led_driver);
  63        if (ret < 0)
  64                goto out;
  65
  66        pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
  67        if (IS_ERR(pdev)) {
  68                ret = PTR_ERR(pdev);
  69                platform_driver_unregister(&net48xx_led_driver);
  70                goto out;
  71        }
  72
  73out:
  74        return ret;
  75}
  76
  77static void __exit net48xx_led_exit(void)
  78{
  79        platform_device_unregister(pdev);
  80        platform_driver_unregister(&net48xx_led_driver);
  81}
  82
  83module_init(net48xx_led_init);
  84module_exit(net48xx_led_exit);
  85
  86MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
  87MODULE_DESCRIPTION("Soekris net48xx LED driver");
  88MODULE_LICENSE("GPL");
  89
  90