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2413306c LW |
1 | /* |
2 | * apple-gmux.h - microcontroller built into dual GPU MacBook Pro & Mac Pro | |
3 | * Copyright (C) 2015 Lukas Wunner <lukas@wunner.de> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License (version 2) as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #ifndef LINUX_APPLE_GMUX_H | |
19 | #define LINUX_APPLE_GMUX_H | |
20 | ||
21 | #include <linux/acpi.h> | |
22 | ||
23 | #define GMUX_ACPI_HID "APP000B" | |
24 | ||
25 | /** | |
26 | * apple_gmux_present() - detect if gmux is built into the machine | |
27 | * | |
28 | * Drivers may use this to activate quirks specific to dual GPU MacBook Pros | |
29 | * and Mac Pros, e.g. for deferred probing, runtime pm and backlight. | |
30 | * | |
31 | * Return: %true if gmux is present and the kernel was configured | |
32 | * with CONFIG_APPLE_GMUX, %false otherwise. | |
33 | */ | |
34 | static inline bool apple_gmux_present(void) | |
35 | { | |
36 | return IS_ENABLED(CONFIG_APPLE_GMUX) && acpi_dev_present(GMUX_ACPI_HID); | |
37 | } | |
38 | ||
39 | #endif /* LINUX_APPLE_GMUX_H */ |