forked from Minki/linux
c3f8f65046
Convert the corgi backlight driver to a more generic version so it can be reused by other code rather than being Zaurus/PXA specific. Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
170 lines
4.0 KiB
C
170 lines
4.0 KiB
C
/*
|
|
* 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>
|
|
|
|
static int corgibl_intensity;
|
|
static struct backlight_properties corgibl_data;
|
|
static struct backlight_device *corgi_backlight_device;
|
|
static struct generic_bl_info *bl_machinfo;
|
|
|
|
static unsigned long corgibl_flags;
|
|
#define CORGIBL_SUSPENDED 0x01
|
|
#define CORGIBL_BATTLOW 0x02
|
|
|
|
static int corgibl_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 (corgibl_flags & CORGIBL_SUSPENDED)
|
|
intensity = 0;
|
|
if (corgibl_flags & CORGIBL_BATTLOW)
|
|
intensity &= bl_machinfo->limit_mask;
|
|
|
|
bl_machinfo->set_bl_intensity(intensity);
|
|
|
|
corgibl_intensity = intensity;
|
|
|
|
if (bl_machinfo->kick_battery)
|
|
bl_machinfo->kick_battery();
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int corgibl_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
struct backlight_device *bd = platform_get_drvdata(pdev);
|
|
|
|
corgibl_flags |= CORGIBL_SUSPENDED;
|
|
backlight_update_status(bd);
|
|
return 0;
|
|
}
|
|
|
|
static int corgibl_resume(struct platform_device *pdev)
|
|
{
|
|
struct backlight_device *bd = platform_get_drvdata(pdev);
|
|
|
|
corgibl_flags &= ~CORGIBL_SUSPENDED;
|
|
backlight_update_status(bd);
|
|
return 0;
|
|
}
|
|
#else
|
|
#define corgibl_suspend NULL
|
|
#define corgibl_resume NULL
|
|
#endif
|
|
|
|
static int corgibl_get_intensity(struct backlight_device *bd)
|
|
{
|
|
return corgibl_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)
|
|
{
|
|
if (limit)
|
|
corgibl_flags |= CORGIBL_BATTLOW;
|
|
else
|
|
corgibl_flags &= ~CORGIBL_BATTLOW;
|
|
backlight_update_status(corgi_backlight_device);
|
|
}
|
|
EXPORT_SYMBOL(corgibl_limit_intensity);
|
|
|
|
|
|
static struct backlight_ops corgibl_ops = {
|
|
.get_brightness = corgibl_get_intensity,
|
|
.update_status = corgibl_send_intensity,
|
|
};
|
|
|
|
static int corgibl_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;
|
|
|
|
corgi_backlight_device = backlight_device_register (name,
|
|
&pdev->dev, NULL, &corgibl_ops);
|
|
if (IS_ERR (corgi_backlight_device))
|
|
return PTR_ERR (corgi_backlight_device);
|
|
|
|
platform_set_drvdata(pdev, corgi_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);
|
|
|
|
printk("Corgi Backlight Driver Initialized.\n");
|
|
return 0;
|
|
}
|
|
|
|
static int corgibl_remove(struct platform_device *pdev)
|
|
{
|
|
struct backlight_device *bd = platform_get_drvdata(pdev);
|
|
|
|
corgibl_data.power = 0;
|
|
corgibl_data.brightness = 0;
|
|
backlight_update_status(bd);
|
|
|
|
backlight_device_unregister(bd);
|
|
|
|
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 = "generic-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");
|