leds-cobalt-raq.c

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/*
 *  LEDs driver for the Cobalt Raq series.
 *
 *  Copyright (C) 2007  Yoichi Yuasa <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/export.h>

#define LED_WEB     0x04
#define LED_POWER_OFF   0x08

static void __iomem *led_port;
static u8 led_value;
static DEFINE_SPINLOCK(led_value_lock);

static void raq_web_led_set(struct led_classdev *led_cdev,
                enum led_brightness brightness)
{
    unsigned long flags;

    spin_lock_irqsave(&led_value_lock, flags);

    if (brightness)
        led_value |= LED_WEB;
    else
        led_value &= ~LED_WEB;
    writeb(led_value, led_port);

    spin_unlock_irqrestore(&led_value_lock, flags);
}

static struct led_classdev raq_web_led = {
    .name       = "raq::web",
    .brightness_set = raq_web_led_set,
};

static void raq_power_off_led_set(struct led_classdev *led_cdev,
                  enum led_brightness brightness)
{
    unsigned long flags;

    spin_lock_irqsave(&led_value_lock, flags);

    if (brightness)
        led_value |= LED_POWER_OFF;
    else
        led_value &= ~LED_POWER_OFF;
    writeb(led_value, led_port);

    spin_unlock_irqrestore(&led_value_lock, flags);
}

static struct led_classdev raq_power_off_led = {
    .name           = "raq::power-off",
    .brightness_set     = raq_power_off_led_set,
    .default_trigger    = "power-off",
};

static int __devinit cobalt_raq_led_probe(struct platform_device *pdev)
{
    struct resource *res;
    int retval;

    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
    if (!res)
        return -EBUSY;

    led_port = ioremap(res->start, resource_size(res));
    if (!led_port)
        return -ENOMEM;

    retval = led_classdev_register(&pdev->dev, &raq_power_off_led);
    if (retval)
        goto err_iounmap;

    retval = led_classdev_register(&pdev->dev, &raq_web_led);
    if (retval)
        goto err_unregister;

    return 0;

err_unregister:
    led_classdev_unregister(&raq_power_off_led);

err_iounmap:
    iounmap(led_port);
    led_port = NULL;

    return retval;
}

static int __devexit cobalt_raq_led_remove(struct platform_device *pdev)
{
    led_classdev_unregister(&raq_power_off_led);
    led_classdev_unregister(&raq_web_led);

    if (led_port) {
        iounmap(led_port);
        led_port = NULL;
    }

    return 0;
}

static struct platform_driver cobalt_raq_led_driver = {
    .probe  = cobalt_raq_led_probe,
    .remove = __devexit_p(cobalt_raq_led_remove),
    .driver = {
        .name   = "cobalt-raq-leds",
        .owner  = THIS_MODULE,
    },
};

static int __init cobalt_raq_led_init(void)
{
    return platform_driver_register(&cobalt_raq_led_driver);
}

module_init(cobalt_raq_led_init);