202 lines
4.6 KiB
C
202 lines
4.6 KiB
C
/*
|
|
* Backlight Driver for Sharp Corgi
|
|
*
|
|
* Copyright (c) 2004-2005 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/spinlock.h>
|
|
#include <linux/fb.h>
|
|
#include <linux/backlight.h>
|
|
|
|
#include <asm/arch/sharpsl.h>
|
|
#include <asm/hardware/sharpsl_pm.h>
|
|
|
|
#define CORGI_DEFAULT_INTENSITY 0x1f
|
|
#define CORGI_LIMIT_MASK 0x0b
|
|
|
|
static int corgibl_powermode = FB_BLANK_UNBLANK;
|
|
static int current_intensity = 0;
|
|
static int corgibl_limit = 0;
|
|
static void (*corgibl_mach_set_intensity)(int intensity);
|
|
static spinlock_t bl_lock = SPIN_LOCK_UNLOCKED;
|
|
static struct backlight_properties corgibl_data;
|
|
|
|
static void corgibl_send_intensity(int intensity)
|
|
{
|
|
unsigned long flags;
|
|
void (*corgi_kick_batt)(void);
|
|
|
|
if (corgibl_powermode != FB_BLANK_UNBLANK) {
|
|
intensity = 0;
|
|
} else {
|
|
if (corgibl_limit)
|
|
intensity &= CORGI_LIMIT_MASK;
|
|
}
|
|
|
|
spin_lock_irqsave(&bl_lock, flags);
|
|
|
|
corgibl_mach_set_intensity(intensity);
|
|
|
|
spin_unlock_irqrestore(&bl_lock, flags);
|
|
|
|
corgi_kick_batt = symbol_get(sharpsl_battery_kick);
|
|
if (corgi_kick_batt) {
|
|
corgi_kick_batt();
|
|
symbol_put(sharpsl_battery_kick);
|
|
}
|
|
}
|
|
|
|
static void corgibl_blank(int blank)
|
|
{
|
|
switch(blank) {
|
|
|
|
case FB_BLANK_NORMAL:
|
|
case FB_BLANK_VSYNC_SUSPEND:
|
|
case FB_BLANK_HSYNC_SUSPEND:
|
|
case FB_BLANK_POWERDOWN:
|
|
if (corgibl_powermode == FB_BLANK_UNBLANK) {
|
|
corgibl_send_intensity(0);
|
|
corgibl_powermode = blank;
|
|
}
|
|
break;
|
|
case FB_BLANK_UNBLANK:
|
|
if (corgibl_powermode != FB_BLANK_UNBLANK) {
|
|
corgibl_powermode = blank;
|
|
corgibl_send_intensity(current_intensity);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int corgibl_suspend(struct platform_device *dev, pm_message_t state)
|
|
{
|
|
corgibl_blank(FB_BLANK_POWERDOWN);
|
|
return 0;
|
|
}
|
|
|
|
static int corgibl_resume(struct platform_device *dev)
|
|
{
|
|
corgibl_blank(FB_BLANK_UNBLANK);
|
|
return 0;
|
|
}
|
|
#else
|
|
#define corgibl_suspend NULL
|
|
#define corgibl_resume NULL
|
|
#endif
|
|
|
|
|
|
static int corgibl_set_power(struct backlight_device *bd, int state)
|
|
{
|
|
corgibl_blank(state);
|
|
return 0;
|
|
}
|
|
|
|
static int corgibl_get_power(struct backlight_device *bd)
|
|
{
|
|
return corgibl_powermode;
|
|
}
|
|
|
|
static int corgibl_set_intensity(struct backlight_device *bd, int intensity)
|
|
{
|
|
if (intensity > corgibl_data.max_brightness)
|
|
intensity = corgibl_data.max_brightness;
|
|
corgibl_send_intensity(intensity);
|
|
current_intensity=intensity;
|
|
return 0;
|
|
}
|
|
|
|
static int corgibl_get_intensity(struct backlight_device *bd)
|
|
{
|
|
return current_intensity;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
corgibl_limit = (limit ? 1 : 0);
|
|
corgibl_send_intensity(current_intensity);
|
|
}
|
|
EXPORT_SYMBOL(corgibl_limit_intensity);
|
|
|
|
|
|
static struct backlight_properties corgibl_data = {
|
|
.owner = THIS_MODULE,
|
|
.get_power = corgibl_get_power,
|
|
.set_power = corgibl_set_power,
|
|
.get_brightness = corgibl_get_intensity,
|
|
.set_brightness = corgibl_set_intensity,
|
|
};
|
|
|
|
static struct backlight_device *corgi_backlight_device;
|
|
|
|
static int __init corgibl_probe(struct platform_device *pdev)
|
|
{
|
|
struct corgibl_machinfo *machinfo = pdev->dev.platform_data;
|
|
|
|
corgibl_data.max_brightness = machinfo->max_intensity;
|
|
corgibl_mach_set_intensity = machinfo->set_bl_intensity;
|
|
|
|
corgi_backlight_device = backlight_device_register ("corgi-bl",
|
|
NULL, &corgibl_data);
|
|
if (IS_ERR (corgi_backlight_device))
|
|
return PTR_ERR (corgi_backlight_device);
|
|
|
|
corgibl_set_intensity(NULL, CORGI_DEFAULT_INTENSITY);
|
|
corgibl_limit_intensity(0);
|
|
|
|
printk("Corgi Backlight Driver Initialized.\n");
|
|
return 0;
|
|
}
|
|
|
|
static int corgibl_remove(struct platform_device *dev)
|
|
{
|
|
backlight_device_unregister(corgi_backlight_device);
|
|
|
|
corgibl_set_intensity(NULL, 0);
|
|
|
|
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("GPLv2");
|