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/*
* Backlight Driver for HP Jornada 680
*
* Copyright (c) 2005 Andriy Skulysh
*
* Based on Sharp's Corgi Backlight Driver
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#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 <cpu/dac.h>
#include <mach/hp6xx.h>
#include <asm/hd64461.h>
#define HP680_MAX_INTENSITY 255
#define HP680_DEFAULT_INTENSITY 10
static int hp680bl_suspended;
static int current_intensity = 0;
static DEFINE_SPINLOCK(bl_lock);
static void hp680bl_send_intensity(struct backlight_device *bd)
{
unsigned long flags;
u16 v;
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 (hp680bl_suspended)
intensity = 0;
spin_lock_irqsave(&bl_lock, flags);
if (intensity && current_intensity == 0) {
sh_dac_enable(DAC_LCD_BRIGHTNESS);
v = inw(HD64461_GPBDR);
v &= ~HD64461_GPBDR_LCDOFF;
outw(v, HD64461_GPBDR);
sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
} else if (intensity == 0 && current_intensity != 0) {
sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
sh_dac_disable(DAC_LCD_BRIGHTNESS);
v = inw(HD64461_GPBDR);
v |= HD64461_GPBDR_LCDOFF;
outw(v, HD64461_GPBDR);
} else if (intensity) {
sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
}
spin_unlock_irqrestore(&bl_lock, flags);
current_intensity = intensity;
}
#ifdef CONFIG_PM
static int hp680bl_suspend(struct platform_device *pdev, pm_message_t state)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
hp680bl_suspended = 1;
hp680bl_send_intensity(bd);
return 0;
}
static int hp680bl_resume(struct platform_device *pdev)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
hp680bl_suspended = 0;
hp680bl_send_intensity(bd);
return 0;
}
#else
#define hp680bl_suspend NULL
#define hp680bl_resume NULL
#endif
static int hp680bl_set_intensity(struct backlight_device *bd)
{
hp680bl_send_intensity(bd);
return 0;
}
static int hp680bl_get_intensity(struct backlight_device *bd)
{
return current_intensity;
}
static const struct backlight_ops hp680bl_ops = {
.get_brightness = hp680bl_get_intensity,
.update_status = hp680bl_set_intensity,
};
static int hp680bl_probe(struct platform_device *pdev)
{
struct backlight_properties props;
struct backlight_device *bd;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = HP680_MAX_INTENSITY;
bd = backlight_device_register("hp680-bl", &pdev->dev, NULL,
&hp680bl_ops, &props);
if (IS_ERR(bd))
return PTR_ERR(bd);
platform_set_drvdata(pdev, bd);
bd->props.brightness = HP680_DEFAULT_INTENSITY;
hp680bl_send_intensity(bd);
return 0;
}
static int hp680bl_remove(struct platform_device *pdev)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
bd->props.brightness = 0;
bd->props.power = 0;
hp680bl_send_intensity(bd);
backlight_device_unregister(bd);
return 0;
}
static struct platform_driver hp680bl_driver = {
.probe = hp680bl_probe,
.remove = hp680bl_remove,
.suspend = hp680bl_suspend,
.resume = hp680bl_resume,
.driver = {
.name = "hp680-bl",
},
};
static struct platform_device *hp680bl_device;
static int __init hp680bl_init(void)
{
int ret;
ret = platform_driver_register(&hp680bl_driver);
if (ret)
return ret;
hp680bl_device = platform_device_register_simple("hp680-bl", -1,
NULL, 0);
if (IS_ERR(hp680bl_device)) {
platform_driver_unregister(&hp680bl_driver);
return PTR_ERR(hp680bl_device);
}
return 0;
}
static void __exit hp680bl_exit(void)
{
platform_device_unregister(hp680bl_device);
platform_driver_unregister(&hp680bl_driver);
}
module_init(hp680bl_init);
module_exit(hp680bl_exit);
MODULE_AUTHOR("Andriy Skulysh <askulysh@gmail.com>");
MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver");
MODULE_LICENSE("GPL");
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