apple-gmux: Add helper for presence detect
Centralize gmux' ACPI HID in a header file and add apple_gmux_present(). This can be used by other drivers to activate quirks specific to dual GPU MacBook Pros & Mac Pros. The alternative would be to hardcode DMI or PCI IDs and amend them whenever Apple introduces a new machine. Tested-by: Lukas Wunner <lukas@wunner.de> [MBP 9,1 2012 intel IVB + nvidia GK107 pre-retina 15"] Signed-off-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Darren Hart <dvhart@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/89c23769058a340e5e11d4a7102f3793d3b0c94c.1452525860.git.lukas@wunner.de
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@ -3451,6 +3451,10 @@ int num_ioctls;</synopsis>
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<title>Backlight control</title>
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!Pdrivers/platform/x86/apple-gmux.c Backlight control
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</sect2>
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<sect2>
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<title>Public functions</title>
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!Iinclude/linux/apple-gmux.h
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</sect2>
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</sect1>
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</chapter>
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@ -19,6 +19,7 @@
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#include <linux/acpi.h>
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#include <linux/pnp.h>
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#include <linux/apple_bl.h>
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#include <linux/apple-gmux.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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@ -828,7 +829,7 @@ static void gmux_remove(struct pnp_dev *pnp)
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}
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static const struct pnp_device_id gmux_device_ids[] = {
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{"APP000B", 0},
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{GMUX_ACPI_HID, 0},
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{"", 0}
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};
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39
include/linux/apple-gmux.h
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39
include/linux/apple-gmux.h
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@ -0,0 +1,39 @@
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/*
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* apple-gmux.h - microcontroller built into dual GPU MacBook Pro & Mac Pro
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* Copyright (C) 2015 Lukas Wunner <lukas@wunner.de>
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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 program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef LINUX_APPLE_GMUX_H
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#define LINUX_APPLE_GMUX_H
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#include <linux/acpi.h>
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#define GMUX_ACPI_HID "APP000B"
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/**
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* apple_gmux_present() - detect if gmux is built into the machine
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*
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* Drivers may use this to activate quirks specific to dual GPU MacBook Pros
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* and Mac Pros, e.g. for deferred probing, runtime pm and backlight.
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*
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* Return: %true if gmux is present and the kernel was configured
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* with CONFIG_APPLE_GMUX, %false otherwise.
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*/
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static inline bool apple_gmux_present(void)
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{
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return IS_ENABLED(CONFIG_APPLE_GMUX) && acpi_dev_present(GMUX_ACPI_HID);
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}
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#endif /* LINUX_APPLE_GMUX_H */
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