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[PATCH] Support powering sharp zaurus sl-5500 LCD up and down 

This adds support for powering Zaurus's video up and down.  PDA without
screen is kind of useless, so it is quite important...  I'll have to figure
out how to really control the frontlight, because LCD without that is quite
hard to read.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
wifi-calibration
Pavel Machek 2005-09-06 15:16:45 -07:00 committed by Linus Torvalds
parent f2cf8e25ba
commit 987132bb0b
2 changed files with 158 additions and 0 deletions
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1
drivers/video/backlight/Makefile
View File

@ -3,3 +3,4 @@
obj-$(CONFIG_LCD_CLASS_DEVICE) += lcd.o
obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
obj-$(CONFIG_BACKLIGHT_CORGI) += corgi_bl.o
obj-$(CONFIG_SHARP_LOCOMO) += locomolcd.o

157
drivers/video/backlight/locomolcd.c 100644
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@ -0,0 +1,157 @@
/*
* Backlight control code for Sharp Zaurus SL-5500
*
* Copyright 2005 John Lenz <lenz@cs.wisc.edu>
* Maintainer: Pavel Machek <pavel@suse.cz> (unless John wants to :-)
* GPL v2
*
* This driver assumes single CPU. That's okay, because collie is
* slightly old hardware, and noone is going to retrofit second CPU to
* old PDA.
*/
/* LCD power functions */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <asm/hardware/locomo.h>
#include <asm/irq.h>
#ifdef CONFIG_SA1100_COLLIE
#include <asm/arch/collie.h>
#else
#include <asm/arch/poodle.h>
#endif
extern void (*sa1100fb_lcd_power)(int on);
static struct locomo_dev *locomolcd_dev;
static void locomolcd_on(int comadj)
{
locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 0);
locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 1);
mdelay(2);
locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0);
locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 1);
mdelay(2);
locomo_m62332_senddata(locomolcd_dev, comadj, 0);
mdelay(5);
locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 0);
locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 1);
mdelay(10);
/* TFTCRST | CPSOUT=0 | CPSEN */
locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
/* Set CPSD */
locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
/* TFTCRST | CPSOUT=0 | CPSEN */
locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
mdelay(10);
locomo_gpio_set_dir(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 0);
locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 1);
}
static void locomolcd_off(int comadj)
{
/* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
mdelay(1);
locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHA_ON, 0);
mdelay(110);
locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VEE_ON, 0);
mdelay(700);
/* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);
locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_MOD, 0);
locomo_gpio_write(locomolcd_dev, LOCOMO_GPIO_LCD_VSHD_ON, 0);
}
void locomolcd_power(int on)
{
int comadj = 118;
unsigned long flags;
local_irq_save(flags);
if (!locomolcd_dev) {
local_irq_restore(flags);
return;
}
/* read comadj */
#ifdef CONFIG_MACH_POODLE
comadj = 118;
#else
comadj = 128;
#endif
if (on)
locomolcd_on(comadj);
else
locomolcd_off(comadj);
local_irq_restore(flags);
}
EXPORT_SYMBOL(locomolcd_power);
static int poodle_lcd_probe(struct locomo_dev *dev)
{
unsigned long flags;
local_irq_save(flags);
locomolcd_dev = dev;
/* the poodle_lcd_power function is called for the first time
* from fs_initcall, which is before locomo is activated.
* We need to recall poodle_lcd_power here*/
#ifdef CONFIG_MACH_POODLE
locomolcd_power(1);
#endif
local_irq_restore(flags);
return 0;
}
static int poodle_lcd_remove(struct locomo_dev *dev)
{
unsigned long flags;
local_irq_save(flags);
locomolcd_dev = NULL;
local_irq_restore(flags);
return 0;
}
static struct locomo_driver poodle_lcd_driver = {
.drv = {
.name = "locomo-backlight",
},
.devid = LOCOMO_DEVID_BACKLIGHT,
.probe = poodle_lcd_probe,
.remove = poodle_lcd_remove,
};
static int __init poodle_lcd_init(void)
{
int ret = locomo_driver_register(&poodle_lcd_driver);
if (ret) return ret;
#ifdef CONFIG_SA1100_COLLIE
sa1100fb_lcd_power = locomolcd_power;
#endif
return 0;
}
device_initcall(poodle_lcd_init);