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backlight: Add HP Jornada 700 series LCD driver
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Signed-off-by: Kristoffer Ericson <[email protected]>
Signed-off-by: Richard Purdie <[email protected]>
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Kristoffer Ericson authored and rpurdie committed Apr 6, 2009
1 parent b8cdd87 commit 9e12443
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9 changes: 9 additions & 0 deletions drivers/video/backlight/Kconfig
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Expand Up @@ -84,6 +84,15 @@ config LCD_TOSA
If you have an Sharp SL-6000 Zaurus say Y to enable a driver
for its LCD.

config LCD_HP700
tristate "HP Jornada 700 series LCD Driver"
depends on LCD_CLASS_DEVICE
depends on SA1100_JORNADA720_SSP && !PREEMPT
default y
help
If you have an HP Jornada 700 series handheld (710/720/728)
say Y to enable LCD control driver.

#
# Backlight
#
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1 change: 1 addition & 0 deletions drivers/video/backlight/Makefile
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Expand Up @@ -2,6 +2,7 @@

obj-$(CONFIG_LCD_CLASS_DEVICE) += lcd.o
obj-$(CONFIG_LCD_CORGI) += corgi_lcd.o
obj-$(CONFIG_LCD_HP700) += jornada720_lcd.o
obj-$(CONFIG_LCD_LTV350QV) += ltv350qv.o
obj-$(CONFIG_LCD_ILI9320) += ili9320.o
obj-$(CONFIG_LCD_PLATFORM) += platform_lcd.o
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153 changes: 153 additions & 0 deletions drivers/video/backlight/jornada720_lcd.c
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@@ -0,0 +1,153 @@
/*
*
* LCD driver for HP Jornada 700 series (710/720/728)
* Copyright (C) 2006-2009 Kristoffer Ericson <[email protected]>
*
* 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/device.h>
#include <linux/fb.h>
#include <linux/kernel.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>

#include <mach/jornada720.h>
#include <mach/hardware.h>

#include <video/s1d13xxxfb.h>

#define LCD_MAX_CONTRAST 0xff
#define LCD_DEF_CONTRAST 0x80

static int jornada_lcd_get_power(struct lcd_device *dev)
{
/* LDD2 in PPC = LCD POWER */
if (PPSR & PPC_LDD2)
return FB_BLANK_UNBLANK; /* PW ON */
else
return FB_BLANK_POWERDOWN; /* PW OFF */
}

static int jornada_lcd_get_contrast(struct lcd_device *dev)
{
int ret;

if (jornada_lcd_get_power(dev) != FB_BLANK_UNBLANK)
return 0;

jornada_ssp_start();

if (jornada_ssp_byte(GETCONTRAST) != TXDUMMY) {
printk(KERN_ERR "lcd: get contrast failed\n");
jornada_ssp_end();
return -ETIMEDOUT;
} else {
ret = jornada_ssp_byte(TXDUMMY);
jornada_ssp_end();
return ret;
}
}

static int jornada_lcd_set_contrast(struct lcd_device *dev, int value)
{
int ret;

jornada_ssp_start();

/* start by sending our set contrast cmd to mcu */
ret = jornada_ssp_byte(SETCONTRAST);

/* push the new value */
if (jornada_ssp_byte(value) != TXDUMMY) {
printk(KERN_ERR "lcd : set contrast failed\n");
jornada_ssp_end();
return -ETIMEDOUT;
}

/* if we get here we can assume everything went well */
jornada_ssp_end();

return 0;
}

static int jornada_lcd_set_power(struct lcd_device *dev, int power)
{
if (power != FB_BLANK_UNBLANK) {
PPSR &= ~PPC_LDD2;
PPDR |= PPC_LDD2;
} else
PPSR |= PPC_LDD2;

return 0;
}

static struct lcd_ops jornada_lcd_props = {
.get_contrast = jornada_lcd_get_contrast,
.set_contrast = jornada_lcd_set_contrast,
.get_power = jornada_lcd_get_power,
.set_power = jornada_lcd_set_power,
};

static int jornada_lcd_probe(struct platform_device *pdev)
{
struct lcd_device *lcd_device;
int ret;

lcd_device = lcd_device_register(S1D_DEVICENAME, &pdev->dev, NULL, &jornada_lcd_props);

if (IS_ERR(lcd_device)) {
ret = PTR_ERR(lcd_device);
printk(KERN_ERR "lcd : failed to register device\n");
return ret;
}

platform_set_drvdata(pdev, lcd_device);

/* lets set our default values */
jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
/* give it some time to startup */
msleep(100);

return 0;
}

static int jornada_lcd_remove(struct platform_device *pdev)
{
struct lcd_device *lcd_device = platform_get_drvdata(pdev);

lcd_device_unregister(lcd_device);

return 0;
}

static struct platform_driver jornada_lcd_driver = {
.probe = jornada_lcd_probe,
.remove = jornada_lcd_remove,
.driver = {
.name = "jornada_lcd",
},
};

int __init jornada_lcd_init(void)
{
return platform_driver_register(&jornada_lcd_driver);
}

void __exit jornada_lcd_exit(void)
{
platform_driver_unregister(&jornada_lcd_driver);
}

MODULE_AUTHOR("Kristoffer Ericson <[email protected]>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
MODULE_LICENSE("GPL");

module_init(jornada_lcd_init);
module_exit(jornada_lcd_exit);

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