256 lines
6.2 KiB
C
256 lines
6.2 KiB
C
/*
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* Backlight control code for Sharp Zaurus SL-5500
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*
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* Copyright 2005 John Lenz <lenz@cs.wisc.edu>
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* Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)
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* GPL v2
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*
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* This driver assumes single CPU. That's okay, because collie is
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* slightly old hardware, and no one is going to retrofit second CPU to
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* old PDA.
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*/
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/* LCD power functions */
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <asm/hardware/locomo.h>
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#include <asm/irq.h>
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#include <asm/mach/sharpsl_param.h>
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#include <asm/mach-types.h>
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#include "../../../arch/arm/mach-sa1100/generic.h"
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static struct backlight_device *locomolcd_bl_device;
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static struct locomo_dev *locomolcd_dev;
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static unsigned long locomolcd_flags;
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#define LOCOMOLCD_SUSPENDED 0x01
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static void locomolcd_on(int comadj)
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{
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locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
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locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 1);
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mdelay(2);
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locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
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locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 1);
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mdelay(2);
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locomo_m62332_senddata(locomolcd_dev, comadj, 0);
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mdelay(5);
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locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
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locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 1);
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mdelay(10);
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/* TFTCRST | CPSOUT=0 | CPSEN */
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locomo_writel(0x01, locomolcd_dev->mapbase + LOCOMO_TC);
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/* Set CPSD */
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locomo_writel(6, locomolcd_dev->mapbase + LOCOMO_CPSD);
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/* TFTCRST | CPSOUT=0 | CPSEN */
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locomo_writel((0x04 | 0x01), locomolcd_dev->mapbase + LOCOMO_TC);
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mdelay(10);
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locomo_gpio_set_dir(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
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locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 1);
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}
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static void locomolcd_off(int comadj)
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{
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/* TFTCRST=1 | CPSOUT=1 | CPSEN = 0 */
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locomo_writel(0x06, locomolcd_dev->mapbase + LOCOMO_TC);
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mdelay(1);
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locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHA_ON, 0);
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mdelay(110);
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locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VEE_ON, 0);
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mdelay(700);
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/* TFTCRST=0 | CPSOUT=0 | CPSEN = 0 */
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locomo_writel(0, locomolcd_dev->mapbase + LOCOMO_TC);
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locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_MOD, 0);
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locomo_gpio_write(locomolcd_dev->dev.parent, LOCOMO_GPIO_LCD_VSHD_ON, 0);
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}
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void locomolcd_power(int on)
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{
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int comadj = sharpsl_param.comadj;
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unsigned long flags;
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local_irq_save(flags);
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if (!locomolcd_dev) {
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local_irq_restore(flags);
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return;
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}
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/* read comadj */
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if (comadj == -1 && machine_is_collie())
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comadj = 128;
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if (comadj == -1 && machine_is_poodle())
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comadj = 118;
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if (on)
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locomolcd_on(comadj);
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else
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locomolcd_off(comadj);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(locomolcd_power);
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static int current_intensity;
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static int locomolcd_set_intensity(struct backlight_device *bd)
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{
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int intensity = bd->props.brightness;
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if (bd->props.power != FB_BLANK_UNBLANK)
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intensity = 0;
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if (bd->props.fb_blank != FB_BLANK_UNBLANK)
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intensity = 0;
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if (locomolcd_flags & LOCOMOLCD_SUSPENDED)
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intensity = 0;
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switch (intensity) {
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/*
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* AC and non-AC are handled differently,
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* but produce same results in sharp code?
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*/
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case 0:
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locomo_frontlight_set(locomolcd_dev, 0, 0, 161);
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break;
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case 1:
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locomo_frontlight_set(locomolcd_dev, 117, 0, 161);
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break;
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case 2:
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locomo_frontlight_set(locomolcd_dev, 163, 0, 148);
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break;
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case 3:
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locomo_frontlight_set(locomolcd_dev, 194, 0, 161);
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break;
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case 4:
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locomo_frontlight_set(locomolcd_dev, 194, 1, 161);
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break;
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default:
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return -ENODEV;
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}
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current_intensity = intensity;
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return 0;
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}
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static int locomolcd_get_intensity(struct backlight_device *bd)
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{
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return current_intensity;
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}
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static const struct backlight_ops locomobl_data = {
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.get_brightness = locomolcd_get_intensity,
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.update_status = locomolcd_set_intensity,
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};
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#ifdef CONFIG_PM_SLEEP
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static int locomolcd_suspend(struct device *dev)
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{
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locomolcd_flags |= LOCOMOLCD_SUSPENDED;
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locomolcd_set_intensity(locomolcd_bl_device);
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return 0;
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}
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static int locomolcd_resume(struct device *dev)
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{
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locomolcd_flags &= ~LOCOMOLCD_SUSPENDED;
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locomolcd_set_intensity(locomolcd_bl_device);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(locomolcd_pm_ops, locomolcd_suspend, locomolcd_resume);
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static int locomolcd_probe(struct locomo_dev *ldev)
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{
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struct backlight_properties props;
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unsigned long flags;
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local_irq_save(flags);
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locomolcd_dev = ldev;
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locomo_gpio_set_dir(ldev->dev.parent, LOCOMO_GPIO_FL_VR, 0);
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/*
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* the poodle_lcd_power function is called for the first time
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* from fs_initcall, which is before locomo is activated.
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* We need to recall poodle_lcd_power here
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*/
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if (machine_is_poodle())
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locomolcd_power(1);
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local_irq_restore(flags);
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memset(&props, 0, sizeof(struct backlight_properties));
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props.type = BACKLIGHT_RAW;
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props.max_brightness = 4;
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locomolcd_bl_device = backlight_device_register("locomo-bl",
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&ldev->dev, NULL,
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&locomobl_data, &props);
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if (IS_ERR(locomolcd_bl_device))
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return PTR_ERR(locomolcd_bl_device);
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/* Set up frontlight so that screen is readable */
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locomolcd_bl_device->props.brightness = 2;
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locomolcd_set_intensity(locomolcd_bl_device);
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return 0;
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}
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static int locomolcd_remove(struct locomo_dev *dev)
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{
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unsigned long flags;
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locomolcd_bl_device->props.brightness = 0;
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locomolcd_bl_device->props.power = 0;
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locomolcd_set_intensity(locomolcd_bl_device);
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backlight_device_unregister(locomolcd_bl_device);
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local_irq_save(flags);
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locomolcd_dev = NULL;
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local_irq_restore(flags);
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return 0;
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}
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static struct locomo_driver poodle_lcd_driver = {
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.drv = {
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.name = "locomo-backlight",
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.pm = &locomolcd_pm_ops,
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},
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.devid = LOCOMO_DEVID_BACKLIGHT,
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.probe = locomolcd_probe,
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.remove = locomolcd_remove,
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};
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static int __init locomolcd_init(void)
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{
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return locomo_driver_register(&poodle_lcd_driver);
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}
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static void __exit locomolcd_exit(void)
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{
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locomo_driver_unregister(&poodle_lcd_driver);
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}
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module_init(locomolcd_init);
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module_exit(locomolcd_exit);
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MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
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MODULE_DESCRIPTION("Collie LCD driver");
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MODULE_LICENSE("GPL");
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