/*
 *  Backlight Driver for Qualcomm MSM using microp_klt
 *
 *  Copyright (c) 2009 Timothy Meade
 *
 *  Based on Zaurus driver Copyright (c) 2004-2006 Richard Purdie
 *  Based on Sharp's 2.4 Backlight Driver
 *
 *  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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/fb.h>
#include <linux/backlight.h>

static int microp_klt_intensity;

static struct backlight_properties microp_klt_backlight_data;
static struct backlight_device *microp_klt_backlight_device;
static struct generic_bl_info *bl_machinfo;

/*
static unsigned long microp_klt_backlight_flags;
#define microp_klt_backlight_SUSPENDED     0x01
#define microp_klt_backlight_BATTLOW       0x02
*/

static int microp_klt_backlight_send_intensity(struct backlight_device *bd)
{
	int intensity = bd->props.brightness;

/*
	if (bd->props.power != FB_BLANK_UNBLANK)
		intensity = 0;
	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
		intensity = 0;
	if (microp_klt_backlight_flags & microp_klt_backlight_SUSPENDED)
		intensity = 0;
	if (microp_klt_backlight_flags & microp_klt_backlight_BATTLOW)
		intensity &= bl_machinfo->limit_mask;
*/

	bl_machinfo->set_bl_intensity(intensity);

	microp_klt_backlight_intensity = intensity;

/*
	if (bl_machinfo->kick_battery)
		bl_machinfo->kick_battery();
*/

	return 0;
}

#ifdef CONFIG_PM
static int microp_klt_backlight_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct backlight_device *bd = platform_get_drvdata(pdev);

	microp_klt_backlight_flags |= microp_klt_backlight_SUSPENDED;
	backlight_update_status(bd);
	return 0;
}

static int microp_klt_backlight_resume(struct platform_device *pdev)
{
	struct backlight_device *bd = platform_get_drvdata(pdev);

	microp_klt_backlight_flags &= ~microp_klt_backlight_SUSPENDED;
	backlight_update_status(bd);
	return 0;
}
#else
#define microp_klt_backlight_suspend	NULL
#define microp_klt_backlight_resume	NULL
#endif

static int microp_klt_backlight_get_intensity(struct backlight_device *bd)
{
	return microp_klt_backlight_intensity;
}

static struct backlight_ops microp_klt_backlight_ops = {
	.get_brightness = microp_klt_backlight_get_intensity,
	.update_status  = microp_klt_backlight_send_intensity,
};

static int microp_klt_backlight_probe(struct platform_device *pdev)
{
	struct generic_bl_info *machinfo = pdev->dev.platform_data;
	const char *name = "generic-bl";

	bl_machinfo = machinfo;
/*
	if (!machinfo->limit_mask)
		machinfo->limit_mask = -1;
*/

	if (machinfo->name)
		name = machinfo->name;

	microp_klt_backlight_device = backlight_device_register (name,
		&pdev->dev, NULL, &microp_klt_backlight_ops);
	if (IS_ERR (microp_klt_backlight_device))
		return PTR_ERR (microp_klt_backlight_device);

	platform_set_drvdata(pdev, microp_klt_backlight_device);

/*
	corgi_backlight_device->props.max_brightness = machinfo->max_intensity;
	corgi_backlight_device->props.power = FB_BLANK_UNBLANK;
	corgi_backlight_device->props.brightness = machinfo->default_intensity;
	backlight_update_status(corgi_backlight_device);
*/

        microp_klt_backlight_device->props.brightness = machinfo->default_intensity;

	printk("microp-klt-backlight Driver Initialized.\n");
	return 0;
}

static int microp_klt_backlight_remove(struct platform_device *pdev)
{
	struct backlight_device *bd = platform_get_drvdata(pdev);

/*
	microp_klt_backlight_data.power = 0;
	microp_klt_backlight_data.brightness = 0;
*/

	backlight_update_status(bd);

	backlight_device_unregister(bd);

	printk("microp-klt-backlight Driver Unloaded\n");
	return 0;
}

static struct platform_driver microp_klt_backlight_driver = {
	.probe		= microp_klt_backlight_probe,
	.remove		= microp_klt_backlight_remove,
	.suspend	= microp_klt_backlight_suspend,
	.resume		= mircop_klt_backlight_resume,
	.driver		= {
		.name	= "generic-bl",
	},
};

static int __init microp_klt_backlight_init(void)
{
	return platform_driver_register(&microp_klt_backlight_driver);
}

static void __exit microp_klt_backlight_exit(void)
{
	platform_driver_unregister(&microp_klt_backlight_driver);
}

module_init(microp_klt_backlight_init);
module_exit(microp_klt_backlight_exit);

MODULE_AUTHOR("Timothy Meade <zt.tmzt@gmail.com");
MODULE_DESCRIPTION("microp-klt-backlight Driver");
MODULE_LICENSE("GPL");