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b717211971
The DRM drivers i915, nouveau and radeon may be compiled with CONFIG_ACPI not set, in which case acpi_dev_present() is undefined. Add a no-op stub for apple_gmux_present() which is used if CONFIG_APPLE_GMUX is not enabled to avoid build breakage. (CONFIG_APPLE_GMUX depends on CONFIG_ACPI.) Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20160210131741.GA15492@wunner.de
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/*
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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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#if IS_ENABLED(CONFIG_APPLE_GMUX)
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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 acpi_dev_present(GMUX_ACPI_HID);
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}
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#else /* !CONFIG_APPLE_GMUX */
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static inline bool apple_gmux_present(void)
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{
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return false;
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}
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#endif /* !CONFIG_APPLE_GMUX */
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#endif /* LINUX_APPLE_GMUX_H */
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