| /* 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 */ |