backlight: Add Nvidia-based Apple Macbook Pro backlight driver (7be35c72) · Commits · 戴 / test

drivers/video/backlight/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -119,3 +119,12 @@ config BACKLIGHT_PWM
		help
		If you have a LCD backlight adjustable by PWM, say Y to enable
		this driver.

		config BACKLIGHT_MBP_NVIDIA
		tristate "MacBook Pro Nvidia Backlight Driver"
		depends on BACKLIGHT_CLASS_DEVICE && X86
		default n
		help
		If you have an Apple Macbook Pro with Nvidia graphics hardware say Y
		to enable a driver for its backlight

drivers/video/backlight/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -11,3 +11,5 @@ obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
		obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
		obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
		obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o
		obj-$(CONFIG_BACKLIGHT_MBP_NVIDIA) += mbp_nvidia_bl.o

drivers/video/backlight/mbp_nvidia_bl.c

0 → 100644

+116 −0

Original line number	Diff line number	Diff line
		/*
		* Backlight Driver for Nvidia 8600 in Macbook Pro
		*
		* Copyright (c) Red Hat <mjg@redhat.com>
		* Based on code from Pommed:
		* Copyright (C) 2006 Nicolas Boichat <nicolas @boichat.ch>
		* Copyright (C) 2006 Felipe Alfaro Solana <felipe_alfaro @linuxmail.org>
		* Copyright (C) 2007 Julien BLACHE <jb@jblache.org>
		*
		* 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.
		*
		* This driver triggers SMIs which cause the firmware to change the
		* backlight brightness. This is icky in many ways, but it's impractical to
		* get at the firmware code in order to figure out what it's actually doing.
		*/

		#include <linux/module.h>
		#include <linux/kernel.h>
		#include <linux/init.h>
		#include <linux/platform_device.h>
		#include <linux/backlight.h>
		#include <linux/err.h>
		#include <linux/dmi.h>
		#include <linux/io.h>

		static struct backlight_device *mbp_backlight_device;

		static struct dmi_system_id __initdata mbp_device_table[] = {
		{
		.ident = "3,1",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"),
		},
		},
		{
		.ident = "3,2",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"),
		},
		},
		{
		.ident = "4,1",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
		DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"),
		},
		},
		{ }
		};

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

		outb(0x04 \| (intensity << 4), 0xb3);
		outb(0xbf, 0xb2);

		return 0;
		}

		static int mbp_get_intensity(struct backlight_device *bd)
		{
		outb(0x03, 0xb3);
		outb(0xbf, 0xb2);
		return inb(0xb3) >> 4;
		}

		static struct backlight_ops mbp_ops = {
		.get_brightness = mbp_get_intensity,
		.update_status = mbp_send_intensity,
		};

		static int __init mbp_init(void)
		{
		if (!dmi_check_system(mbp_device_table))
		return -ENODEV;

		if (!request_region(0xb2, 2, "Macbook Pro backlight"))
		return -ENXIO;

		mbp_backlight_device = backlight_device_register("mbp_backlight",
		NULL, NULL,
		&mbp_ops);
		if (IS_ERR(mbp_backlight_device)) {
		release_region(0xb2, 2);
		return PTR_ERR(mbp_backlight_device);
		}

		mbp_backlight_device->props.max_brightness = 15;
		mbp_backlight_device->props.brightness =
		mbp_get_intensity(mbp_backlight_device);
		backlight_update_status(mbp_backlight_device);

		return 0;
		}

		static void __exit mbp_exit(void)
		{
		backlight_device_unregister(mbp_backlight_device);

		release_region(0xb2, 2);
		}

		module_init(mbp_init);
		module_exit(mbp_exit);

		MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
		MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("svnAppleInc.:pnMacBookPro3,1");
		MODULE_ALIAS("svnAppleInc.:pnMacBookPro3,2");
		MODULE_ALIAS("svnAppleInc.:pnMacBookPro4,1");

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