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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 | ||
b7172119 LW |
25 | #if IS_ENABLED(CONFIG_APPLE_GMUX) |
26 | ||
2413306c LW |
27 | /** |
28 | * apple_gmux_present() - detect if gmux is built into the machine | |
29 | * | |
30 | * Drivers may use this to activate quirks specific to dual GPU MacBook Pros | |
31 | * and Mac Pros, e.g. for deferred probing, runtime pm and backlight. | |
32 | * | |
33 | * Return: %true if gmux is present and the kernel was configured | |
34 | * with CONFIG_APPLE_GMUX, %false otherwise. | |
35 | */ | |
36 | static inline bool apple_gmux_present(void) | |
37 | { | |
c68ae33e | 38 | return acpi_dev_found(GMUX_ACPI_HID); |
2413306c LW |
39 | } |
40 | ||
b7172119 LW |
41 | #else /* !CONFIG_APPLE_GMUX */ |
42 | ||
43 | static inline bool apple_gmux_present(void) | |
44 | { | |
45 | return false; | |
46 | } | |
47 | ||
48 | #endif /* !CONFIG_APPLE_GMUX */ | |
49 | ||
2413306c | 50 | #endif /* LINUX_APPLE_GMUX_H */ |