LXR linux/include/linux/apple-gmux.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * apple-gmux.h - microcontroller built into dual GPU MacBook Pro & Mac Pro
   4 * Copyright (C) 2015 Lukas Wunner <lukas@wunner.de>
   5 */
   6
   7#ifndef LINUX_APPLE_GMUX_H
   8#define LINUX_APPLE_GMUX_H
   9
  10#include <linux/acpi.h>
  11
  12#define GMUX_ACPI_HID "APP000B"
  13
  14#if IS_ENABLED(CONFIG_APPLE_GMUX)
  15
  16/**
  17 * apple_gmux_present() - detect if gmux is built into the machine
  18 *
  19 * Drivers may use this to activate quirks specific to dual GPU MacBook Pros
  20 * and Mac Pros, e.g. for deferred probing, runtime pm and backlight.
  21 *
  22 * Return: %true if gmux is present and the kernel was configured
  23 * with CONFIG_APPLE_GMUX, %false otherwise.
  24 */
  25static inline bool apple_gmux_present(void)
  26{
  27        return acpi_dev_found(GMUX_ACPI_HID);
  28}
  29
  30#else  /* !CONFIG_APPLE_GMUX */
  31
  32static inline bool apple_gmux_present(void)
  33{
  34        return false;
  35}
  36
  37#endif /* !CONFIG_APPLE_GMUX */
  38
  39#endif /* LINUX_APPLE_GMUX_H */
  40