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leds-cobalt-raq.c

/*
 *  LEDs driver for the Cobalt Raq series.
 *
 *  Copyright (C) 2007  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
 *
 *  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>

#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, res->end - res->start + 1);
      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);

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