Commit 13a7b5dc authored by Kristoffer Ericson's avatar Kristoffer Ericson Committed by Richard Purdie

backlight: Adds HP Jornada 700 series backlight driver

Signed-off-by: default avatarKristoffer Ericson <kristoffer.ericson@gmail.com>
Signed-off-by: default avatarRichard Purdie <rpurdie@linux.intel.com>
parent 9e124435
......@@ -166,6 +166,15 @@ config BACKLIGHT_HP680
If you have a HP Jornada 680, say y to enable the
backlight driver.
config BACKLIGHT_HP700
tristate "HP Jornada 700 series Backlight Driver"
depends on BACKLIGHT_CLASS_DEVICE
depends on SA1100_JORNADA720_SSP && !PREEMPT
default y
help
If you have an HP Jornada 700 series,
say Y to include backlight control driver.
config BACKLIGHT_PROGEAR
tristate "Frontpath ProGear Backlight Driver"
depends on BACKLIGHT_CLASS_DEVICE && PCI && X86
......
......@@ -13,6 +13,7 @@ obj-$(CONFIG_LCD_TOSA) += tosa_lcd.o
obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
obj-$(CONFIG_BACKLIGHT_ATMEL_PWM) += atmel-pwm-bl.o
obj-$(CONFIG_BACKLIGHT_GENERIC) += generic_bl.o
obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o
obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
......
/*
*
* Backlight driver for HP Jornada 700 series (710/720/728)
* Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 or any later version as published by the Free Software Foundation.
*
*/
#include <linux/backlight.h>
#include <linux/device.h>
#include <linux/fb.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <mach/jornada720.h>
#include <mach/hardware.h>
#include <video/s1d13xxxfb.h>
#define BL_MAX_BRIGHT 255
#define BL_DEF_BRIGHT 25
static int jornada_bl_get_brightness(struct backlight_device *bd)
{
int ret;
/* check if backlight is on */
if (!(PPSR & PPC_LDD1))
return 0;
jornada_ssp_start();
/* cmd should return txdummy */
ret = jornada_ssp_byte(GETBRIGHTNESS);
if (jornada_ssp_byte(GETBRIGHTNESS) != TXDUMMY) {
printk(KERN_ERR "bl : get brightness timeout\n");
jornada_ssp_end();
return -ETIMEDOUT;
} else /* exchange txdummy for value */
ret = jornada_ssp_byte(TXDUMMY);
jornada_ssp_end();
return (BL_MAX_BRIGHT - ret);
}
static int jornada_bl_update_status(struct backlight_device *bd)
{
int ret = 0;
jornada_ssp_start();
/* If backlight is off then really turn it off */
if ((bd->props.power != FB_BLANK_UNBLANK) || (bd->props.fb_blank != FB_BLANK_UNBLANK)) {
ret = jornada_ssp_byte(BRIGHTNESSOFF);
if (ret != TXDUMMY) {
printk(KERN_INFO "bl : brightness off timeout\n");
/* turn off backlight */
PPSR &= ~PPC_LDD1;
PPDR |= PPC_LDD1;
ret = -ETIMEDOUT;
}
} else /* turn on backlight */
PPSR |= PPC_LDD1;
/* send command to our mcu */
if (jornada_ssp_byte(SETBRIGHTNESS) != TXDUMMY) {
printk(KERN_INFO "bl : failed to set brightness\n");
ret = -ETIMEDOUT;
goto out
}
/* at this point we expect that the mcu has accepted
our command and is waiting for our new value
please note that maximum brightness is 255,
but due to physical layout it is equal to 0, so we simply
invert the value (MAX VALUE - NEW VALUE). */
if (jornada_ssp_byte(BL_MAX_BRIGHT - bd->props.brightness) != TXDUMMY) {
printk(KERN_ERR "bl : set brightness failed\n");
ret = -ETIMEDOUT;
}
/* If infact we get an TXDUMMY as output we are happy and dont
make any further comments about it */
out:
jornada_ssp_end();
return ret;
}
static struct backlight_ops jornada_bl_ops = {
.get_brightness = jornada_bl_get_brightness,
.update_status = jornada_bl_update_status,
.options = BL_CORE_SUSPENDRESUME,
};
static int jornada_bl_probe(struct platform_device *pdev)
{
int ret;
struct backlight_device *bd;
bd = backlight_device_register(S1D_DEVICENAME, &pdev->dev, NULL, &jornada_bl_ops);
if (IS_ERR(bd)) {
ret = PTR_ERR(bd);
printk(KERN_ERR "bl : failed to register device, err=%x\n", ret);
return ret;
}
bd->props.power = FB_BLANK_UNBLANK;
bd->props.brightness = BL_DEF_BRIGHT;
/* note. make sure max brightness is set otherwise
you will get seemingly non-related errors when
trying to change brightness */
bd->props.max_brightness = BL_MAX_BRIGHT;
jornada_bl_update_status(bd);
platform_set_drvdata(pdev, bd);
printk(KERN_INFO "HP Jornada 700 series backlight driver\n");
return 0;
}
static int jornada_bl_remove(struct platform_device *pdev)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
backlight_device_unregister(bd);
return 0;
}
static struct platform_driver jornada_bl_driver = {
.probe = jornada_bl_probe,
.remove = jornada_bl_remove,
.driver = {
.name = "jornada_bl",
},
};
int __init jornada_bl_init(void)
{
return platform_driver_register(&jornada_bl_driver);
}
void __exit jornada_bl_exit(void)
{
platform_driver_unregister(&jornada_bl_driver);
}
MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 Backlight driver");
MODULE_LICENSE("GPL");
module_init(jornada_bl_init);
module_exit(jornada_bl_exit);
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment