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leds-net48xx.c

/*
 * LEDs driver for Soekris net48xx
 *
 * Copyright (C) 2006 Chris Boot <bootc@bootc.net>
 *
 * Based on leds-ams-delta.c
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/err.h>
#include <asm/io.h>
#include <linux/nsc_gpio.h>
#include <linux/scx200_gpio.h>

#define DRVNAME "net48xx-led"
#define NET48XX_ERROR_LED_GPIO      20

static struct platform_device *pdev;

static void net48xx_error_led_set(struct led_classdev *led_cdev,
            enum led_brightness value)
{
      scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
}

static struct led_classdev net48xx_error_led = {
      .name       = "net48xx:error",
      .brightness_set   = net48xx_error_led_set,
};

#ifdef CONFIG_PM
static int net48xx_led_suspend(struct platform_device *dev,
            pm_message_t state)
{
      led_classdev_suspend(&net48xx_error_led);
      return 0;
}

static int net48xx_led_resume(struct platform_device *dev)
{
      led_classdev_resume(&net48xx_error_led);
      return 0;
}
#else
#define net48xx_led_suspend NULL
#define net48xx_led_resume NULL
#endif

static int net48xx_led_probe(struct platform_device *pdev)
{
      return led_classdev_register(&pdev->dev, &net48xx_error_led);
}

static int net48xx_led_remove(struct platform_device *pdev)
{
      led_classdev_unregister(&net48xx_error_led);
      return 0;
}

static struct platform_driver net48xx_led_driver = {
      .probe            = net48xx_led_probe,
      .remove           = net48xx_led_remove,
      .suspend    = net48xx_led_suspend,
      .resume           = net48xx_led_resume,
      .driver           = {
            .name       = DRVNAME,
            .owner            = THIS_MODULE,
      },
};

static int __init net48xx_led_init(void)
{
      int ret;

      /* small hack, but scx200_gpio doesn't set .dev if the probe fails */
      if (!scx200_gpio_ops.dev) {
            ret = -ENODEV;
            goto out;
      }

      ret = platform_driver_register(&net48xx_led_driver);
      if (ret < 0)
            goto out;

      pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
      if (IS_ERR(pdev)) {
            ret = PTR_ERR(pdev);
            platform_driver_unregister(&net48xx_led_driver);
            goto out;
      }

out:
      return ret;
}

static void __exit net48xx_led_exit(void)
{
      platform_device_unregister(pdev);
      platform_driver_unregister(&net48xx_led_driver);
}

module_init(net48xx_led_init);
module_exit(net48xx_led_exit);

MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
MODULE_DESCRIPTION("Soekris net48xx LED driver");
MODULE_LICENSE("GPL");


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