leds-wrap.c

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/*
 * LEDs driver for PCEngines WRAP
 *
 * Copyright (C) 2006 Kristian Kielhofner <[email protected]>
 *
 * Based on leds-net48xx.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/scx200_gpio.h>
#include <linux/module.h>

#define DRVNAME "wrap-led"
#define WRAP_POWER_LED_GPIO 2
#define WRAP_ERROR_LED_GPIO 3
#define WRAP_EXTRA_LED_GPIO 18

static struct platform_device *pdev;

static void wrap_power_led_set(struct led_classdev *led_cdev,
        enum led_brightness value)
{
    if (value)
        scx200_gpio_set_low(WRAP_POWER_LED_GPIO);
    else
        scx200_gpio_set_high(WRAP_POWER_LED_GPIO);
}

static void wrap_error_led_set(struct led_classdev *led_cdev,
        enum led_brightness value)
{
    if (value)
        scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
    else
        scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
}

static void wrap_extra_led_set(struct led_classdev *led_cdev,
        enum led_brightness value)
{
    if (value)
        scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
    else
        scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
}

static struct led_classdev wrap_power_led = {
    .name           = "wrap::power",
    .brightness_set     = wrap_power_led_set,
    .default_trigger    = "default-on",
    .flags          = LED_CORE_SUSPENDRESUME,
};

static struct led_classdev wrap_error_led = {
    .name       = "wrap::error",
    .brightness_set = wrap_error_led_set,
    .flags          = LED_CORE_SUSPENDRESUME,
};

static struct led_classdev wrap_extra_led = {
    .name           = "wrap::extra",
    .brightness_set = wrap_extra_led_set,
    .flags          = LED_CORE_SUSPENDRESUME,
};

static int wrap_led_probe(struct platform_device *pdev)
{
    int ret;

    ret = led_classdev_register(&pdev->dev, &wrap_power_led);
    if (ret < 0)
        return ret;

    ret = led_classdev_register(&pdev->dev, &wrap_error_led);
    if (ret < 0)
        goto err1;

    ret = led_classdev_register(&pdev->dev, &wrap_extra_led);
    if (ret < 0)
        goto err2;

    return ret;

err2:
    led_classdev_unregister(&wrap_error_led);
err1:
    led_classdev_unregister(&wrap_power_led);

    return ret;
}

static int wrap_led_remove(struct platform_device *pdev)
{
    led_classdev_unregister(&wrap_power_led);
    led_classdev_unregister(&wrap_error_led);
    led_classdev_unregister(&wrap_extra_led);
    return 0;
}

static struct platform_driver wrap_led_driver = {
    .probe      = wrap_led_probe,
    .remove     = wrap_led_remove,
    .driver     = {
        .name       = DRVNAME,
        .owner      = THIS_MODULE,
    },
};

static int __init wrap_led_init(void)
{
    int ret;

    if (!scx200_gpio_present()) {
        ret = -ENODEV;
        goto out;
    }

    ret = platform_driver_register(&wrap_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(&wrap_led_driver);
        goto out;
    }

out:
    return ret;
}

static void __exit wrap_led_exit(void)
{
    platform_device_unregister(pdev);
    platform_driver_unregister(&wrap_led_driver);
}

module_init(wrap_led_init);
module_exit(wrap_led_exit);

MODULE_AUTHOR("Kristian Kielhofner <[email protected]>");
MODULE_DESCRIPTION("PCEngines WRAP LED driver");
MODULE_LICENSE("GPL");