backlight: Add driver for Tabletkiosk Sahara TouchIT-213 Tablet PC (d03ebb12) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/video/backlight/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -204,3 +204,10 @@ config BACKLIGHT_TOSA
		If you have an Sharp SL-6000 Zaurus say Y to enable a driver
		for its backlight

		config BACKLIGHT_SAHARA
		tristate "Tabletkiosk Sahara Touch-iT Backlight Driver"
		depends on BACKLIGHT_CLASS_DEVICE && X86
		default n
		help
		If you have a Tabletkiosk Sahara Touch-iT, say y to enable the
		backlight driver.

drivers/video/backlight/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -21,5 +21,5 @@ obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o
		obj-$(CONFIG_BACKLIGHT_DA903X) += da903x.o
		obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o
		obj-$(CONFIG_BACKLIGHT_TOSA) += tosa_bl.o

		obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o

drivers/video/backlight/kb3886_bl.c

0 → 100644

+204 −0

Original line number	Diff line number	Diff line
		/*
		* Backlight Driver for the KB3886 Backlight
		*
		* Copyright (c) 2007-2008 Claudio Nieder
		*
		* Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle
		*
		* 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.
		*
		*/

		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/init.h>
		#include <linux/platform_device.h>
		#include <linux/mutex.h>
		#include <linux/fb.h>
		#include <linux/backlight.h>
		#include <linux/delay.h>
		#include <linux/dmi.h>

		#define KB3886_PARENT 0x64
		#define KB3886_IO 0x60
		#define KB3886_ADC_DAC_PWM 0xC4
		#define KB3886_PWM0_WRITE 0x81
		#define KB3886_PWM0_READ 0x41

		static DEFINE_MUTEX(bl_mutex);

		static void kb3886_bl_set_intensity(int intensity)
		{
		mutex_lock(&bl_mutex);
		intensity = intensity&0xff;
		outb(KB3886_ADC_DAC_PWM, KB3886_PARENT);
		msleep(10);
		outb(KB3886_PWM0_WRITE, KB3886_IO);
		msleep(10);
		outb(intensity, KB3886_IO);
		mutex_unlock(&bl_mutex);
		}

		struct kb3886bl_machinfo {
		int max_intensity;
		int default_intensity;
		int limit_mask;
		void (*set_bl_intensity)(int intensity);
		};

		static struct kb3886bl_machinfo kb3886_bl_machinfo = {
		.max_intensity = 0xff,
		.default_intensity = 0xa0,
		.limit_mask = 0x7f,
		.set_bl_intensity = kb3886_bl_set_intensity,
		};

		static struct platform_device kb3886bl_device = {
		.name = "kb3886-bl",
		.dev = {
		.platform_data = &kb3886_bl_machinfo,
		},
		.id = -1,
		};

		static struct platform_device *devices[] __initdata = {
		&kb3886bl_device,
		};

		/*
		* Back to driver
		*/

		static int kb3886bl_intensity;
		static struct backlight_device *kb3886_backlight_device;
		static struct kb3886bl_machinfo *bl_machinfo;

		static unsigned long kb3886bl_flags;
		#define KB3886BL_SUSPENDED 0x01

		static struct dmi_system_id __initdata kb3886bl_device_table[] = {
		{
		.ident = "Sahara Touch-iT",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "SDV"),
		DMI_MATCH(DMI_PRODUCT_NAME, "iTouch T201"),
		},
		},
		{ }
		};

		static int kb3886bl_send_intensity(struct backlight_device *bd)
		{
		int intensity = bd->props.brightness;

		if (bd->props.power != FB_BLANK_UNBLANK)
		intensity = 0;
		if (bd->props.fb_blank != FB_BLANK_UNBLANK)
		intensity = 0;
		if (kb3886bl_flags & KB3886BL_SUSPENDED)
		intensity = 0;

		bl_machinfo->set_bl_intensity(intensity);

		kb3886bl_intensity = intensity;
		return 0;
		}

		#ifdef CONFIG_PM
		static int kb3886bl_suspend(struct platform_device *pdev, pm_message_t state)
		{
		struct backlight_device *bd = platform_get_drvdata(pdev);

		kb3886bl_flags \|= KB3886BL_SUSPENDED;
		backlight_update_status(bd);
		return 0;
		}

		static int kb3886bl_resume(struct platform_device *pdev)
		{
		struct backlight_device *bd = platform_get_drvdata(pdev);

		kb3886bl_flags &= ~KB3886BL_SUSPENDED;
		backlight_update_status(bd);
		return 0;
		}
		#else
		#define kb3886bl_suspend NULL
		#define kb3886bl_resume NULL
		#endif

		static int kb3886bl_get_intensity(struct backlight_device *bd)
		{
		return kb3886bl_intensity;
		}

		static struct backlight_ops kb3886bl_ops = {
		.get_brightness = kb3886bl_get_intensity,
		.update_status = kb3886bl_send_intensity,
		};

		static int kb3886bl_probe(struct platform_device *pdev)
		{
		struct kb3886bl_machinfo *machinfo = pdev->dev.platform_data;

		bl_machinfo = machinfo;
		if (!machinfo->limit_mask)
		machinfo->limit_mask = -1;

		kb3886_backlight_device = backlight_device_register("kb3886-bl",
		&pdev->dev, NULL, &kb3886bl_ops);
		if (IS_ERR(kb3886_backlight_device))
		return PTR_ERR(kb3886_backlight_device);

		platform_set_drvdata(pdev, kb3886_backlight_device);

		kb3886_backlight_device->props.max_brightness = machinfo->max_intensity;
		kb3886_backlight_device->props.power = FB_BLANK_UNBLANK;
		kb3886_backlight_device->props.brightness = machinfo->default_intensity;
		backlight_update_status(kb3886_backlight_device);

		return 0;
		}

		static int kb3886bl_remove(struct platform_device *pdev)
		{
		struct backlight_device *bd = platform_get_drvdata(pdev);

		backlight_device_unregister(bd);

		return 0;
		}

		static struct platform_driver kb3886bl_driver = {
		.probe = kb3886bl_probe,
		.remove = kb3886bl_remove,
		.suspend = kb3886bl_suspend,
		.resume = kb3886bl_resume,
		.driver = {
		.name = "kb3886-bl",
		},
		};

		static int __init kb3886_init(void)
		{
		if (!dmi_check_system(kb3886bl_device_table))
		return -ENODEV;

		platform_add_devices(devices, ARRAY_SIZE(devices));
		return platform_driver_register(&kb3886bl_driver);
		}

		static void __exit kb3886_exit(void)
		{
		platform_driver_unregister(&kb3886bl_driver);
		}

		module_init(kb3886_init);
		module_exit(kb3886_exit);

		MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>");
		MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("dmi::svnSDV:pniTouchT201:");