linux/drivers/acpi/x86/apple.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * apple.c - Apple ACPI quirks
 * Copyright (C) 2017 Lukas Wunner <[email protected]>
 */

#include <linux/acpi.h>
#include <linux/bitmap.h>
#include <linux/platform_data/x86/apple.h>
#include <linux/uuid.h>
#include "../internal.h"

/* Apple _DSM device properties GUID */
static const guid_t apple_prp_guid = …;

/**
 * acpi_extract_apple_properties - retrieve and convert Apple _DSM properties
 * @adev: ACPI device for which to retrieve the properties
 *
 * Invoke Apple's custom _DSM once to check the protocol version and once more
 * to retrieve the properties.  They are marshalled up in a single package as
 * alternating key/value elements, unlike _DSD which stores them as a package
 * of 2-element packages.  Convert to _DSD format and make them available under
 * the primary fwnode.
 */
void acpi_extract_apple_properties(struct acpi_device *adev)
{ … }