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/*
* drivers/video/backlight/jornada56x_bllcd.c
*
* HP Jornada560 Series init code
*
* Copyright 2008 Michael J Kaye <mjkaye@ippimail.com>
* Based on jornada56x.c from the Handhelds.org tree, copyright Alex Lange,
* and jornada720_bllcd.c, copyright Kristoffer Ericson.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#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/jornada56x.h>
#include <../drivers/video/sa1100fb.h>
MODULE_AUTHOR("Michael J Kaye <mjkaye@ippimail.com>");
MODULE_DESCRIPTION("HP Jornada 560 Series Backlight/LCD Driver");
MODULE_LICENSE("GPL");
/* Brightness */
#define BL_MAX_BRIGHT 0xbe
#define BL_DEF_BRIGHT 0x19
struct bllcd_device {
struct backlight_device *bl_device;
struct lcd_device *lcd_device;
};
/*
* BACKLIGHT HANDLING ROUTINES
*/
static void jornada56x_backlight_power (int on)
{
if (on)
JORNADA_GPDPCR = JORNADA_BACKLIGHT;
else
JORNADA_GPDPSR = JORNADA_BACKLIGHT;
}
static int jornada56x_backlight_get_brightness (struct backlight_device *bd)
{
return (JORNADA_PWM1_DATA - 0x40000000);
}
static int jornada56x_bl_update_status (struct backlight_device *bd)
{
int value = bd->props.brightness;
int brightness = 190 - value;
if (bd->props.power != FB_BLANK_UNBLANK) {
jornada56x_backlight_power(0);
return 0;
}
if (bd->props.fb_blank != FB_BLANK_UNBLANK) {
jornada56x_backlight_power(0);
return 0;
}
jornada56x_backlight_power(1);
JORNADA_PWM1_CKDR = 0;
/* range is from 0 (brightest) to 255 (darkest)
* although values > 190 are no good
*/
JORNADA_PWM1_DATA = brightness;
JORNADA_PWM_CTRL = 1; /* enable backlight control - 1=Enable ; 0=Disable */
return 0;
}
/*
* LCD HANDLING FUNCTIONS
*/
static void jornada56x_lcd_power(int on)
{
if (on) {
GPSR = GPIO_GPIO24;
} else {
GPCR = GPIO_GPIO24;
}
}
static int jornada56x_lcd_get_power(struct lcd_device *ld)
{
return (GPLR & GPIO_GPIO24) ? 0 : 4;
}
static int jornada56x_lcd_set_power(struct lcd_device *ld, int state)
{
if (state==0)
jornada56x_lcd_power(1);
else
jornada56x_lcd_power(0);
return 0;
}
static struct backlight_ops jornada56x_bl_ops = {
.get_brightness = jornada56x_backlight_get_brightness,
.update_status = jornada56x_bl_update_status,
};
static struct lcd_ops jornada56x_lcd_ops = {
.get_power = jornada56x_lcd_set_power,
.set_power = jornada56x_lcd_get_power,
};
static int __init jornada56x_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("sa1100fb", &pdev->dev, NULL,
&jornada56x_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("sa1100fb", &pdev->dev, NULL,
&jornada56x_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;
}
jornada56x_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;
jornada56x_bl_update_status(bllcd->bl_device);
platform_set_drvdata(pdev, bllcd);
printk(KERN_INFO "HP Jornada 56x Backlight/LCD driver activated\n");
return 0;
}
static int jornada56x_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 jornada56x_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;
jornada56x_bl_update_status(bllcd->bl_device);
jornada56x_lcd_set_power(bllcd->lcd_device, FB_BLANK_POWERDOWN);
return 0;
}
static int jornada56x_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;
jornada56x_bl_update_status(bllcd->bl_device);
jornada56x_lcd_set_power(bllcd->lcd_device, FB_BLANK_UNBLANK);
return 0;
}
static struct platform_driver jornada56x_bl_driver = {
.remove = jornada56x_bl_remove,
#ifdef CONFIG_PM
.suspend = jornada56x_bl_suspend,
.resume = jornada56x_bl_resume,
#endif
.driver = {
.name = "jornada56x_bllcd",
},
};
static int __init jornada56x_bl_init(void)
{
return platform_driver_probe(&jornada56x_bl_driver, jornada56x_bl_probe);
}
static void __exit jornada56x_bl_exit(void)
{
platform_driver_unregister(&jornada56x_bl_driver);
}
module_init(jornada56x_bl_init);
module_exit(jornada56x_bl_exit);
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