7be35c72e6
Nvidia-based Apple Macbook Pros don't appear to handle backlight control through the graphics card registers or ACPI, but instead trigger changes via SMI calls. This driver registers a generic backlight device that lets existing userspace deal with it. Code derived from Julien Blache's Pommed application. Signed-off-by: Julien Blache <jb@jblache.org> Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
117 lines
2.9 KiB
C
117 lines
2.9 KiB
C
/*
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* Backlight Driver for Nvidia 8600 in Macbook Pro
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*
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* Copyright (c) Red Hat <mjg@redhat.com>
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* Based on code from Pommed:
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* Copyright (C) 2006 Nicolas Boichat <nicolas @boichat.ch>
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* Copyright (C) 2006 Felipe Alfaro Solana <felipe_alfaro @linuxmail.org>
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* Copyright (C) 2007 Julien BLACHE <jb@jblache.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This driver triggers SMIs which cause the firmware to change the
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* backlight brightness. This is icky in many ways, but it's impractical to
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* get at the firmware code in order to figure out what it's actually doing.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/backlight.h>
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#include <linux/err.h>
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#include <linux/dmi.h>
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#include <linux/io.h>
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static struct backlight_device *mbp_backlight_device;
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static struct dmi_system_id __initdata mbp_device_table[] = {
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{
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.ident = "3,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"),
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},
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},
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{
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.ident = "3,2",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"),
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},
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},
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{
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.ident = "4,1",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
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DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"),
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},
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},
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{ }
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};
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static int mbp_send_intensity(struct backlight_device *bd)
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{
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int intensity = bd->props.brightness;
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outb(0x04 | (intensity << 4), 0xb3);
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outb(0xbf, 0xb2);
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return 0;
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}
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static int mbp_get_intensity(struct backlight_device *bd)
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{
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outb(0x03, 0xb3);
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outb(0xbf, 0xb2);
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return inb(0xb3) >> 4;
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}
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static struct backlight_ops mbp_ops = {
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.get_brightness = mbp_get_intensity,
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.update_status = mbp_send_intensity,
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};
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static int __init mbp_init(void)
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{
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if (!dmi_check_system(mbp_device_table))
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return -ENODEV;
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if (!request_region(0xb2, 2, "Macbook Pro backlight"))
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return -ENXIO;
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mbp_backlight_device = backlight_device_register("mbp_backlight",
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NULL, NULL,
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&mbp_ops);
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if (IS_ERR(mbp_backlight_device)) {
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release_region(0xb2, 2);
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return PTR_ERR(mbp_backlight_device);
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}
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mbp_backlight_device->props.max_brightness = 15;
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mbp_backlight_device->props.brightness =
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mbp_get_intensity(mbp_backlight_device);
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backlight_update_status(mbp_backlight_device);
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return 0;
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}
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static void __exit mbp_exit(void)
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{
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backlight_device_unregister(mbp_backlight_device);
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release_region(0xb2, 2);
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}
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module_init(mbp_init);
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module_exit(mbp_exit);
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MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
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MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("svnAppleInc.:pnMacBookPro3,1");
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MODULE_ALIAS("svnAppleInc.:pnMacBookPro3,2");
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MODULE_ALIAS("svnAppleInc.:pnMacBookPro4,1");
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