[PATCH] video: hp680 backlight driver (06c6f900) · Commits · e / devices / android_kernel_sony_msm8998

drivers/video/backlight/Kconfig

+8 −0

Original line number	Diff line number	Diff line
		@@ -50,3 +50,11 @@ config BACKLIGHT_CORGI
		If you have a Sharp Zaurus SL-C7xx, say y to enable the
		backlight driver.

		config BACKLIGHT_HP680
		tristate "HP Jornada 680 Backlight Driver"
		depends on BACKLIGHT_DEVICE && SH_HP6XX
		default y
		help
		If you have a HP Jornada 680, say y to enable the
		backlight driver.

drivers/video/backlight/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -3,4 +3,5 @@
		obj-$(CONFIG_LCD_CLASS_DEVICE) += lcd.o
		obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
		obj-$(CONFIG_BACKLIGHT_CORGI) += corgi_bl.o
		obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
		obj-$(CONFIG_SHARP_LOCOMO) += locomolcd.o

drivers/video/backlight/hp680_bl.c

0 → 100644

+189 −0

Original line number	Diff line number	Diff line
		/*
		* Backlight Driver for HP Jornada 680
		*
		* Copyright (c) 2005 Andriy Skulysh
		*
		* Based on Sharp's Corgi Backlight Driver
		*
		* This file is subject to the terms and conditions of the GNU General Public
		* License. See the file "COPYING" in the main directory of this archive
		* for more details.
		*/

		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/init.h>
		#include <linux/device.h>
		#include <linux/spinlock.h>
		#include <linux/fb.h>
		#include <linux/backlight.h>

		#include <asm/cpu/dac.h>
		#include <asm/hp6xx/hp6xx.h>
		#include <asm/hd64461/hd64461.h>

		#define HP680_MAX_INTENSITY 255
		#define HP680_DEFAULT_INTENSITY 10

		static int hp680bl_powermode = FB_BLANK_UNBLANK;
		static int current_intensity = 0;
		static spinlock_t bl_lock = SPIN_LOCK_UNLOCKED;

		static void hp680bl_send_intensity(int intensity)
		{
		unsigned long flags;

		if (hp680bl_powermode != FB_BLANK_UNBLANK)
		intensity = 0;

		spin_lock_irqsave(&bl_lock, flags);
		sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
		spin_unlock_irqrestore(&bl_lock, flags);
		}

		static void hp680bl_blank(int blank)
		{
		u16 v;

		switch(blank) {

		case FB_BLANK_NORMAL:
		case FB_BLANK_VSYNC_SUSPEND:
		case FB_BLANK_HSYNC_SUSPEND:
		case FB_BLANK_POWERDOWN:
		if (hp680bl_powermode == FB_BLANK_UNBLANK) {
		hp680bl_send_intensity(0);
		hp680bl_powermode = blank;
		sh_dac_disable(DAC_LCD_BRIGHTNESS);
		v = inw(HD64461_GPBDR);
		v \|= HD64461_GPBDR_LCDOFF;
		outw(v, HD64461_GPBDR);
		}
		break;
		case FB_BLANK_UNBLANK:
		if (hp680bl_powermode != FB_BLANK_UNBLANK) {
		sh_dac_enable(DAC_LCD_BRIGHTNESS);
		v = inw(HD64461_GPBDR);
		v &= ~HD64461_GPBDR_LCDOFF;
		outw(v, HD64461_GPBDR);
		hp680bl_powermode = blank;
		hp680bl_send_intensity(current_intensity);
		}
		break;
		}
		}

		#ifdef CONFIG_PM
		static int hp680bl_suspend(struct device *dev, pm_message_t state, u32 level)
		{
		if (level == SUSPEND_POWER_DOWN)
		hp680bl_blank(FB_BLANK_POWERDOWN);
		return 0;
		}

		static int hp680bl_resume(struct device *dev, u32 level)
		{
		if (level == RESUME_POWER_ON)
		hp680bl_blank(FB_BLANK_UNBLANK);
		return 0;
		}
		#else
		#define hp680bl_suspend NULL
		#define hp680bl_resume NULL
		#endif


		static int hp680bl_set_power(struct backlight_device *bd, int state)
		{
		hp680bl_blank(state);
		return 0;
		}

		static int hp680bl_get_power(struct backlight_device *bd)
		{
		return hp680bl_powermode;
		}

		static int hp680bl_set_intensity(struct backlight_device *bd, int intensity)
		{
		if (intensity > HP680_MAX_INTENSITY)
		intensity = HP680_MAX_INTENSITY;
		hp680bl_send_intensity(intensity);
		current_intensity = intensity;
		return 0;
		}

		static int hp680bl_get_intensity(struct backlight_device *bd)
		{
		return current_intensity;
		}

		static struct backlight_properties hp680bl_data = {
		.owner = THIS_MODULE,
		.get_power = hp680bl_get_power,
		.set_power = hp680bl_set_power,
		.max_brightness = HP680_MAX_INTENSITY,
		.get_brightness = hp680bl_get_intensity,
		.set_brightness = hp680bl_set_intensity,
		};

		static struct backlight_device *hp680_backlight_device;

		static int __init hp680bl_probe(struct device *dev)
		{
		hp680_backlight_device = backlight_device_register ("hp680-bl",
		NULL, &hp680bl_data);
		if (IS_ERR (hp680_backlight_device))
		return PTR_ERR (hp680_backlight_device);

		hp680bl_set_intensity(NULL, HP680_DEFAULT_INTENSITY);

		return 0;
		}

		static int hp680bl_remove(struct device *dev)
		{
		backlight_device_unregister(hp680_backlight_device);

		return 0;
		}

		static struct device_driver hp680bl_driver = {
		.name = "hp680-bl",
		.bus = &platform_bus_type,
		.probe = hp680bl_probe,
		.remove = hp680bl_remove,
		.suspend = hp680bl_suspend,
		.resume = hp680bl_resume,
		};

		static struct platform_device hp680bl_device = {
		.name = "hp680-bl",
		.id = -1,
		};

		static int __init hp680bl_init(void)
		{
		int ret;

		ret=driver_register(&hp680bl_driver);
		if (!ret) {
		ret = platform_device_register(&hp680bl_device);
		if (ret)
		driver_unregister(&hp680bl_driver);
		}
		return ret;
		}

		static void __exit hp680bl_exit(void)
		{
		platform_device_unregister(&hp680bl_device);
		driver_unregister(&hp680bl_driver);
		}

		module_init(hp680bl_init);
		module_exit(hp680bl_exit);

		MODULE_AUTHOR("Andriy Skulysh <askulysh@image.kiev.ua>");
		MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver");
		MODULE_LICENSE("GPL");