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/*
* Backlight Driver for Sharp Zaurus Handhelds (various models)
*
* 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>
#include <asm/arch/sharpsl.h>
#include <asm/hardware/sharpsl_pm.h>
static int corgibl_intensity;
static DEFINE_MUTEX(bl_mutex);
static struct backlight_properties corgibl_data;
static struct backlight_device *corgi_backlight_device;
static struct corgibl_machinfo *bl_machinfo;
static unsigned long corgibl_flags;
#define CORGIBL_SUSPENDED 0x01
#define CORGIBL_BATTLOW 0x02
static int corgibl_send_intensity(struct backlight_device *bd)
{
void (*corgi_kick_batt)(void);
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 (corgibl_flags & CORGIBL_SUSPENDED)
intensity = 0;
if (corgibl_flags & CORGIBL_BATTLOW)
intensity &= bl_machinfo->limit_mask;
mutex_lock(&bl_mutex);
bl_machinfo->set_bl_intensity(intensity);
mutex_unlock(&bl_mutex);
corgibl_intensity = intensity;
corgi_kick_batt = symbol_get(sharpsl_battery_kick);
if (corgi_kick_batt) {
corgi_kick_batt();
symbol_put(sharpsl_battery_kick);
}
return 0;
}
#ifdef CONFIG_PM
static int corgibl_suspend(struct platform_device *dev, pm_message_t state)
{
corgibl_flags |= CORGIBL_SUSPENDED;
corgibl_send_intensity(corgi_backlight_device);
return 0;
}
static int corgibl_resume(struct platform_device *dev)
{
corgibl_flags &= ~CORGIBL_SUSPENDED;
corgibl_send_intensity(corgi_backlight_device);
return 0;
}
#else
#define corgibl_suspend NULL
#define corgibl_resume NULL
#endif
static int corgibl_get_intensity(struct backlight_device *bd)
{
return corgibl_intensity;
}
static int corgibl_set_intensity(struct backlight_device *bd)
{
corgibl_send_intensity(corgi_backlight_device);
return 0;
}
/*
* Called when the battery is low to limit the backlight intensity.
* If limit==0 clear any limit, otherwise limit the intensity
*/
void corgibl_limit_intensity(int limit)
{
if (limit)
corgibl_flags |= CORGIBL_BATTLOW;
else
corgibl_flags &= ~CORGIBL_BATTLOW;
corgibl_send_intensity(corgi_backlight_device);
}
EXPORT_SYMBOL(corgibl_limit_intensity);
static struct backlight_properties corgibl_data = {
.owner = THIS_MODULE,
.get_brightness = corgibl_get_intensity,
.update_status = corgibl_set_intensity,
};
static int corgibl_probe(struct platform_device *pdev)
{
struct corgibl_machinfo *machinfo = pdev->dev.platform_data;
bl_machinfo = machinfo;
corgibl_data.max_brightness = machinfo->max_intensity;
if (!machinfo->limit_mask)
machinfo->limit_mask = -1;
corgi_backlight_device = backlight_device_register ("corgi-bl",
NULL, &corgibl_data);
if (IS_ERR (corgi_backlight_device))
return PTR_ERR (corgi_backlight_device);
corgibl_data.power = FB_BLANK_UNBLANK;
corgibl_data.brightness = machinfo->default_intensity;
corgibl_send_intensity(corgi_backlight_device);
printk("Corgi Backlight Driver Initialized.\n");
return 0;
}
static int corgibl_remove(struct platform_device *dev)
{
backlight_device_unregister(corgi_backlight_device);
printk("Corgi Backlight Driver Unloaded\n");
return 0;
}
static struct platform_driver corgibl_driver = {
.probe = corgibl_probe,
.remove = corgibl_remove,
.suspend = corgibl_suspend,
.resume = corgibl_resume,
.driver = {
.name = "corgi-bl",
},
};
static int __init corgibl_init(void)
{
return platform_driver_register(&corgibl_driver);
}
static void __exit corgibl_exit(void)
{
platform_driver_unregister(&corgibl_driver);
}
module_init(corgibl_init);
module_exit(corgibl_exit);
MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
MODULE_DESCRIPTION("Corgi Backlight Driver");
MODULE_LICENSE("GPL");
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