leds-net48xx.c

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/*
 * LEDs driver for Soekris net48xx
 *
 * Copyright (C) 2006 Chris Boot <[email protected]>
 *
 * 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>
#include <linux/module.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,
    .flags      = LED_CORE_SUSPENDRESUME,
};

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,
    .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 <[email protected]>");
MODULE_DESCRIPTION("Soekris net48xx LED driver");
MODULE_LICENSE("GPL");