/* SPDX-License-Identifier: GPL-2.0-only */
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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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#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_found(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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