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/*
*
* Backlight and LCD Driver for HP Jornada 720
* Copyright (C) 2007 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/backlight.h>
#include <linux/lcd.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/fb.h>
#include <linux/device.h>
#include <asm/hardware.h>
#include <asm/arch/jornada720.h>
#include <video/s1d13xxxfb.h>
MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 Backlight/LCD Driver");
MODULE_LICENSE("GPL");
/* Contrast */
#define LCD_MAX_CONTR 0xff
#define LCD_DEF_CONTR 0x80
/* Brightness */
#define BL_MAX_BRIGHT 0xff
#define BL_DEF_BRIGHT 0x19
struct bllcd_device {
struct backlight_device *bl_device;
struct lcd_device *lcd_device;
};
/*
* BACKLIGHT HANDLING ROUTINES
*/
static int jornada_bl_get_brightness(struct backlight_device *dev)
{
int ret;
/* check if backlight is on */
if (!(PPSR & PPC_LDD1))
return BL_MAX_BRIGHT;
jornada_ssp_start();
if (jornada_ssp_inout(GETBRIGHTNESS) == -ETIMEDOUT) {
printk(KERN_ERR "bl :get brightness timeout\n");
ret = -1;
} else
ret = jornada_ssp_inout(TXDUMMY);
jornada_ssp_end();
/* 0 is max brightness */
return BL_MAX_BRIGHT - ret;
}
static int jornada_bl_update_status(struct backlight_device *dev)
{
int ret = 0;
int value;
jornada_ssp_start();
if (dev->props.power != FB_BLANK_UNBLANK ||
dev->props.fb_blank != FB_BLANK_UNBLANK) {
ret = jornada_ssp_inout(BRIGHTNESSOFF);
if (ret == -ETIMEDOUT) {
printk(KERN_ERR "bl : brightness off timeout\n");
/* backlight off */
PPSR &= ~PPC_LDD1;
PPDR |= PPC_LDD1;
}
} else { /* backlight on */
PPSR |= PPC_LDD1;
/* send setbrightness cmd */
ret = jornada_ssp_inout(SETBRIGHTNESS);
if (ret != TXDUMMY) {
printk(KERN_ERR "bl :set brightness timeout\n");
} else {
/* cmd accepted */
value = BL_MAX_BRIGHT - dev->props.brightness;
if (jornada_ssp_byte(value) == TXDUMMY)
ret = value;
else
printk(KERN_ERR "bl :set brightness failed\n");
}
}
jornada_ssp_end();
return ret;
}
/*
* LCD HANDLING FUNCTIONS
*/
static int jornada_lcd_set_contrast(struct lcd_device *pdev, int contrast)
{
int ret = 0;
jornada_ssp_start();
ret = jornada_ssp_inout(SETCONTRAST);
if (ret == -ETIMEDOUT)
printk(KERN_ERR "lcd :set contrast timeout\n");
else
ret = jornada_ssp_byte(contrast);
jornada_ssp_end();
return ret;
}
static int jornada_lcd_set_power(struct lcd_device *pdev, int power)
{
if (power != FB_BLANK_UNBLANK) {
/* turn off LCD */
PPSR &= ~PPC_LDD2;
PPDR |= PPC_LDD2;
} else {
/* turn on LCD */
PPSR |= PPC_LDD2;
}
return 0;
}
static int jornada_lcd_get_power(struct lcd_device *pdev)
{
if (PPSR & PPC_LDD2)
return FB_BLANK_UNBLANK;
else
return FB_BLANK_POWERDOWN;
}
static int jornada_lcd_get_contrast(struct lcd_device *pdev)
{
int ret;
/* Don't set contrast on off powerd LCD */
if (jornada_lcd_get_power(pdev) != FB_BLANK_UNBLANK)
return 0;
jornada_ssp_start();
ret = jornada_ssp_inout(GETCONTRAST);
if (ret != -ETIMEDOUT)
ret = jornada_ssp_inout(TXDUMMY);
else {
printk(KERN_ERR "lcd :get contrast timeout\n");
ret = -1;
}
jornada_ssp_end();
return ret;
}
static struct backlight_ops jornada_bl_ops = {
.get_brightness = jornada_bl_get_brightness,
.update_status = jornada_bl_update_status,
};
static struct lcd_ops jornada_lcd_ops = {
.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_bl_probe(struct platform_device *pdev)
{
struct bllcd_device *bllcd;
int ret;
bllcd = kzalloc(sizeof(*bllcd), GFP_KERNEL);
if (bllcd == NULL)
return -ENOMEM;
/* bl driver - name must match fb driver name */
bllcd->bl_device = backlight_device_register(S1D_DEVICENAME,
&pdev->dev, NULL, &jornada_bl_ops);
if (IS_ERR(bllcd->bl_device)) {
ret = PTR_ERR(bllcd->bl_device);
printk(KERN_ERR "bl :failed to register device\n");
kfree(bllcd);
return ret;
}
/* lcd driver */
bllcd->lcd_device = lcd_device_register(S1D_DEVICENAME,
&pdev->dev, NULL, &jornada_lcd_ops);
if (IS_ERR(bllcd->lcd_device)) {
ret = PTR_ERR(bllcd->lcd_device);
backlight_device_unregister(bllcd->bl_device);
printk(KERN_ERR "lcd :failed to register device\n");
kfree(bllcd);
return ret;
}
jornada_lcd_set_contrast(bllcd->lcd_device, LCD_DEF_CONTR);
jornada_lcd_set_power(bllcd->lcd_device, FB_BLANK_UNBLANK);
msleep(100);
bllcd->bl_device->props.power = FB_BLANK_UNBLANK;
bllcd->bl_device->props.brightness = BL_DEF_BRIGHT;
jornada_bl_update_status(bllcd->bl_device);
platform_set_drvdata(pdev, bllcd);
printk(KERN_INFO "HP Jornada 7xx Backlight/LCD driver activated\n");
return 0;
}
static int jornada_bl_remove(struct platform_device *pdev)
{
struct bllcd_device *bllcd = platform_get_drvdata(pdev);
bllcd->bl_device->props.power = FB_BLANK_POWERDOWN;
bllcd->bl_device->props.brightness = 0;
bllcd->bl_device->props.max_brightness = 0;
backlight_device_unregister(bllcd->bl_device);
lcd_device_unregister(bllcd->lcd_device);
return 0;
}
static int jornada_bl_suspend(struct platform_device *pdev, pm_message_t state)
{
struct bllcd_device *bllcd = platform_get_drvdata(pdev);
bllcd->bl_device->props.power = FB_BLANK_POWERDOWN;
bllcd->bl_device->props.brightness = 0;
bllcd->bl_device->props.max_brightness = 0;
jornada_bl_update_status(bllcd->bl_device);
jornada_lcd_set_power(bllcd->lcd_device, FB_BLANK_POWERDOWN);
return 0;
}
static int jornada_bl_resume(struct platform_device *pdev)
{
struct bllcd_device *bllcd = platform_get_drvdata(pdev);
bllcd->bl_device->props.power = FB_BLANK_UNBLANK;
bllcd->bl_device->props.brightness = BL_DEF_BRIGHT;
bllcd->bl_device->props.max_brightness = BL_MAX_BRIGHT;
jornada_bl_update_status(bllcd->bl_device);
jornada_lcd_set_power(bllcd->lcd_device, FB_BLANK_UNBLANK);
return 0;
}
static struct platform_driver jornada_bl_driver = {
.probe = jornada_bl_probe,
.remove = jornada_bl_remove,
#ifdef CONFIG_PM
.suspend = jornada_bl_suspend,
.resume = jornada_bl_resume,
#endif
.driver = {
.name = "jornada_bllcd",
},
};
static int __init jornada_bl_init(void)
{
return platform_driver_register(&jornada_bl_driver);
}
static void __exit jornada_bl_exit(void)
{
platform_driver_unregister(&jornada_bl_driver);
}
module_init(jornada_bl_init);
module_exit(jornada_bl_exit);
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