// SPDX-License-Identifier: GPL-2.0-only
/*
* Backlight control code for Sharp Zaurus SL-5500
*
* Copyright 2005 John Lenz <lenz@cs.wisc.edu>
* Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)
*
* This driver assumes single CPU. That's okay, because collie is
* slightly old hardware, and no one is going to retrofit second CPU to
* old PDA.
*/
/* LCD power functions */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/backlight.h>
#include <asm /hardware/locomo.h>
#include <asm /irq.h>
#include <asm /mach/sharpsl_param.h>
#include <asm /mach-types.h>
#include "../../../arch/arm/mach-sa1100/generic.h"
static struct backlight_device *locomolcd_bl_device;
static struct locomo_dev *locomolcd_dev;
static unsigned long locomolcd_flags;
#define LOCOMOLCD_SUSPENDED 0 x01
static void locomolcd_on(int comadj)
{
locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0 );
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 1 );
mdelay(2 );
locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0 );
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 1 );
mdelay(2 );
locomo_m62332_senddata(locomolcd_dev, comadj, 0 );
mdelay(5 );
locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0 );
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 1 );
mdelay(10 );
/* TFTCRST | CPSOUT=0 | CPSEN */
locomo_writel(0 x01, locomolcd_dev->mapbase + LOCOMO_TC);
/* Set CPSD */
locomo_writel(6 , locomolcd_dev->mapbase + LOCOMO_CPSD);
/* TFTCRST | CPSOUT=0 | CPSEN */
locomo_writel((0 x04 | 0 x01), locomolcd_dev->mapbase + LOCOMO_TC);
mdelay(10 );
locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0 );
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 1 );
}
static void locomolcd_off(int comadj)
{
/* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
locomo_writel(0 x06, locomolcd_dev->mapbase + LOCOMO_TC);
mdelay(1 );
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0 );
mdelay(110 );
locomo_gpio_write(locomolcd_dev->dev.parent, 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->dev.parent, LOCOMO_GPIO_LCD_MOD, 0 );
locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0 );
}
void locomolcd_power(int on)
{
int comadj = sharpsl_param.comadj;
unsigned long flags;
local_irq_save(flags);
if (!locomolcd_dev) {
local_irq_restore(flags);
return ;
}
/* read comadj */
if (comadj == -1 && machine_is_collie())
comadj = 128 ;
if (on)
locomolcd_on(comadj);
else
locomolcd_off(comadj);
local_irq_restore(flags);
}
EXPORT_SYMBOL(locomolcd_power);
static int current_intensity;
static int locomolcd_set_intensity(struct backlight_device *bd)
{
int intensity = backlight_get_brightness(bd);
if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
intensity = 0 ;
switch (intensity) {
/*
* AC and non-AC are handled differently,
* but produce same results in sharp code?
*/
case 0 :
locomo_frontlight_set(locomolcd_dev, 0 , 0 , 161 );
break ;
case 1 :
locomo_frontlight_set(locomolcd_dev, 117 , 0 , 161 );
break ;
case 2 :
locomo_frontlight_set(locomolcd_dev, 163 , 0 , 148 );
break ;
case 3 :
locomo_frontlight_set(locomolcd_dev, 194 , 0 , 161 );
break ;
case 4 :
locomo_frontlight_set(locomolcd_dev, 194 , 1 , 161 );
break ;
default :
return -ENODEV;
}
current_intensity = intensity;
return 0 ;
}
static int locomolcd_get_intensity(struct backlight_device *bd)
{
return current_intensity;
}
static const struct backlight_ops locomobl_data = {
.get_brightness = locomolcd_get_intensity,
.update_status = locomolcd_set_intensity,
};
#ifdef CONFIG_PM_SLEEP
static int locomolcd_suspend(struct device *dev)
{
locomolcd_flags |= LOCOMOLCD_SUSPENDED;
locomolcd_set_intensity(locomolcd_bl_device);
return 0 ;
}
static int locomolcd_resume(struct device *dev)
{
locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
locomolcd_set_intensity(locomolcd_bl_device);
return 0 ;
}
#endif
static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
static int locomolcd_probe(struct locomo_dev *ldev)
{
struct backlight_properties props;
unsigned long flags;
local_irq_save(flags);
locomolcd_dev = ldev;
locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0 );
local_irq_restore(flags);
memset(&props, 0 , sizeof (struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = 4 ;
locomolcd_bl_device = backlight_device_register("locomo-bl" ,
&ldev->dev, NULL,
&locomobl_data, &props);
if (IS_ERR(locomolcd_bl_device))
return PTR_ERR(locomolcd_bl_device);
/* Set up frontlight so that screen is readable */
locomolcd_bl_device->props.brightness = 2 ;
locomolcd_set_intensity(locomolcd_bl_device);
return 0 ;
}
static void locomolcd_remove(struct locomo_dev *dev)
{
unsigned long flags;
locomolcd_bl_device->props.brightness = 0 ;
locomolcd_bl_device->props.power = 0 ;
locomolcd_set_intensity(locomolcd_bl_device);
backlight_device_unregister(locomolcd_bl_device);
local_irq_save(flags);
locomolcd_dev = NULL;
local_irq_restore(flags);
}
static struct locomo_driver poodle_lcd_driver = {
.drv = {
.name = "locomo-backlight" ,
.pm = &locomolcd_pm_ops,
},
.devid = LOCOMO_DEVID_BACKLIGHT,
.probe = locomolcd_probe,
.remove = locomolcd_remove,
};
static int __init locomolcd_init(void )
{
return locomo_driver_register(&poodle_lcd_driver);
}
static void __exit locomolcd_exit(void )
{
locomo_driver_unregister(&poodle_lcd_driver);
}
module_init(locomolcd_init);
module_exit(locomolcd_exit);
MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>" );
MODULE_DESCRIPTION("Collie LCD driver" );
MODULE_LICENSE("GPL" );
Messung V0.5 in Prozent C=96 H=88 G=91
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-06-07)
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