/*
   *  LEDs driver for the Cobalt Raq series.
   *

   *  Copyright (C) 2007  Yoichi Yuasa <yuasa@linux-mips.org>

   *
   *  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 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 = devm_ioremap(&pdev->dev, res->start, resource_size(res));

  	if (!led_port)
  		return -ENOMEM;
  
  	retval = led_classdev_register(&pdev->dev, &raq_power_off_led);
  	if (retval)

  		goto err_null;

  
  	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_null:

  	led_port = NULL;
  
  	return retval;
  }

  static struct platform_driver cobalt_raq_led_driver = {
  	.probe	= cobalt_raq_led_probe,

  	.driver = {
  		.name	= "cobalt-raq-leds",

  	},
  };

  builtin_platform_driver(cobalt_raq_led_driver);