linux/sound/hda/intel-sdw-acpi.c

// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
// Copyright(c) 2015-2021 Intel Corporation.

/*
 * SDW Intel ACPI scan helpers
 */

#include <linux/acpi.h>
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/fwnode.h>
#include <linux/module.h>
#include <linux/soundwire/sdw_intel.h>
#include <linux/string.h>

#define SDW_LINK_TYPE …
#define SDW_MAX_LINKS …

static int ctrl_link_mask;
module_param_named(sdw_link_mask, ctrl_link_mask, int, 0444);
MODULE_PARM_DESC(…) …;

static ulong ctrl_addr = …;
module_param_named(sdw_ctrl_addr, ctrl_addr, ulong, 0444);
MODULE_PARM_DESC(…) …;

static bool is_link_enabled(struct fwnode_handle *fw_node, u8 idx)
{ … }

static int
sdw_intel_scan_controller(struct sdw_intel_acpi_info *info)
{ … }

static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level,
				     void *cdata, void **return_value)
{ … }

/**
 * sdw_intel_acpi_scan() - SoundWire Intel init routine
 * @parent_handle: ACPI parent handle
 * @info: description of what firmware/DSDT tables expose
 *
 * This scans the namespace and queries firmware to figure out which
 * links to enable. A follow-up use of sdw_intel_probe() and
 * sdw_intel_startup() is required for creation of devices and bus
 * startup
 */
int sdw_intel_acpi_scan(acpi_handle *parent_handle,
			struct sdw_intel_acpi_info *info)
{ … }
EXPORT_SYMBOL_NS(…);

MODULE_LICENSE(…) …;
MODULE_DESCRIPTION(…) …;