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/*
*
* LCD 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/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 *ld)
{
/* 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 *ld)
{
int ret;
if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
return 0;
jornada_ssp_start();
if (jornada_ssp_byte(GETCONTRAST) != TXDUMMY) {
dev_err(&ld->dev, "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 *ld, 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) {
dev_err(&ld->dev, "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 *ld, 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 = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
&pdev->dev, NULL, &jornada_lcd_props);
if (IS_ERR(lcd_device)) {
ret = PTR_ERR(lcd_device);
dev_err(&pdev->dev, "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 struct platform_driver jornada_lcd_driver = {
.probe = jornada_lcd_probe,
.driver = {
.name = "jornada_lcd",
},
};
module_platform_driver(jornada_lcd_driver);
MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
MODULE_LICENSE("GPL");
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