| /* SPDX-License-Identifier: GPL-2.0-only */ | |
| /* | |
| * apple-gmux.h - microcontroller built into dual GPU MacBook Pro & Mac Pro | |
| * Copyright (C) 2015 Lukas Wunner <lukas@wunner.de> | |
| */ | |
| #ifndef LINUX_APPLE_GMUX_H | |
| #define LINUX_APPLE_GMUX_H | |
| #include <linux/acpi.h> | |
| #define GMUX_ACPI_HID "APP000B" | |
| #if IS_ENABLED(CONFIG_APPLE_GMUX) | |
| /** | |
| * apple_gmux_present() - detect if gmux is built into the machine | |
| * | |
| * Drivers may use this to activate quirks specific to dual GPU MacBook Pros | |
| * and Mac Pros, e.g. for deferred probing, runtime pm and backlight. | |
| * | |
| * Return: %true if gmux is present and the kernel was configured | |
| * with CONFIG_APPLE_GMUX, %false otherwise. | |
| */ | |
| static inline bool apple_gmux_present(void) | |
| { | |
| return acpi_dev_found(GMUX_ACPI_HID); | |
| } | |
| #else /* !CONFIG_APPLE_GMUX */ | |
| static inline bool apple_gmux_present(void) | |
| { | |
| return false; | |
| } | |
| #endif /* !CONFIG_APPLE_GMUX */ | |
| #endif /* LINUX_APPLE_GMUX_H */ |