linux/sound/soc/soc-acpi.c

// SPDX-License-Identifier: GPL-2.0
//
// soc-apci.c - support for ACPI enumeration.
//
// Copyright (c) 2013-15, Intel Corporation.

#include <linux/export.h>
#include <linux/module.h>
#include <sound/soc-acpi.h>

static bool snd_soc_acpi_id_present(struct snd_soc_acpi_mach *machine)
{
	const struct snd_soc_acpi_codecs *comp_ids = machine->comp_ids;
	int i;

	if (machine->id[0]) {
		if (acpi_dev_present(machine->id, NULL, -1))
			return true;
	}

	if (comp_ids) {
		for (i = 0; i < comp_ids->num_codecs; i++) {
			if (acpi_dev_present(comp_ids->codecs[i], NULL, -1)) {
				strscpy(machine->id, comp_ids->codecs[i], ACPI_ID_LEN);
				return true;
			}
		}
	}

	return false;
}

struct snd_soc_acpi_mach *
snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
{
	struct snd_soc_acpi_mach *mach;
	struct snd_soc_acpi_mach *mach_alt;

	for (mach = machines; mach->id[0] || mach->comp_ids; mach++) {
		if (snd_soc_acpi_id_present(mach)) {
			if (mach->machine_quirk) {
				mach_alt = mach->machine_quirk(mach);
				if (!mach_alt)
					continue; /* not full match, ignore */
				mach = mach_alt;
			}

			return mach;
		}
	}
	return NULL;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);

static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
					     void *context, void **ret)
{
	struct acpi_device *adev = acpi_fetch_acpi_dev(handle);
	acpi_status status;
	struct snd_soc_acpi_package_context *pkg_ctx = context;

	pkg_ctx->data_valid = false;

	if (adev && adev->status.present && adev->status.functional) {
		struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
		union acpi_object  *myobj = NULL;

		status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
						NULL, &buffer,
						ACPI_TYPE_PACKAGE);
		if (ACPI_FAILURE(status))
			return AE_OK;

		myobj = buffer.pointer;
		if (!myobj || myobj->package.count != pkg_ctx->length) {
			kfree(buffer.pointer);
			return AE_OK;
		}

		status = acpi_extract_package(myobj,
					pkg_ctx->format, pkg_ctx->state);
		if (ACPI_FAILURE(status)) {
			kfree(buffer.pointer);
			return AE_OK;
		}

		kfree(buffer.pointer);
		pkg_ctx->data_valid = true;
		return AE_CTRL_TERMINATE;
	}

	return AE_OK;
}

bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
				struct snd_soc_acpi_package_context *ctx)
{
	acpi_status status;

	status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);

	if (ACPI_FAILURE(status) || !ctx->data_valid)
		return false;

	return true;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);

struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
{
	struct snd_soc_acpi_mach *mach = arg;
	struct snd_soc_acpi_codecs *codec_list =
		(struct snd_soc_acpi_codecs *) mach->quirk_data;
	int i;

	if (mach->quirk_data == NULL)
		return mach;

	for (i = 0; i < codec_list->num_codecs; i++) {
		if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
			return NULL;
	}

	return mach;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);

#define SDW_CODEC_ADR_MASK(_adr) ((_adr) & (SDW_DISCO_LINK_ID_MASK | SDW_VERSION_MASK | \
				  SDW_MFG_ID_MASK | SDW_PART_ID_MASK))

/* Check if all Slaves defined on the link can be found */
bool snd_soc_acpi_sdw_link_slaves_found(struct device *dev,
					const struct snd_soc_acpi_link_adr *link,
					struct sdw_extended_slave_id *ids,
					int num_slaves)
{
	unsigned int part_id, link_id, unique_id, mfg_id, version;
	int i, j, k;

	for (i = 0; i < link->num_adr; i++) {
		u64 adr = link->adr_d[i].adr;
		int reported_part_count = 0;

		mfg_id = SDW_MFG_ID(adr);
		part_id = SDW_PART_ID(adr);
		link_id = SDW_DISCO_LINK_ID(adr);
		version = SDW_VERSION(adr);

		for (j = 0; j < num_slaves; j++) {
			/* find out how many identical parts were reported on that link */
			if (ids[j].link_id == link_id &&
			    ids[j].id.part_id == part_id &&
			    ids[j].id.mfg_id == mfg_id &&
			    ids[j].id.sdw_version == version)
				reported_part_count++;
		}

		for (j = 0; j < num_slaves; j++) {
			int expected_part_count = 0;

			if (ids[j].link_id != link_id ||
			    ids[j].id.part_id != part_id ||
			    ids[j].id.mfg_id != mfg_id ||
			    ids[j].id.sdw_version != version)
				continue;

			/* find out how many identical parts are expected */
			for (k = 0; k < link->num_adr; k++) {
				u64 adr2 = link->adr_d[k].adr;

				if (SDW_CODEC_ADR_MASK(adr2) == SDW_CODEC_ADR_MASK(adr))
					expected_part_count++;
			}

			if (reported_part_count == expected_part_count) {
				/*
				 * we have to check unique id
				 * if there is more than one
				 * Slave on the link
				 */
				unique_id = SDW_UNIQUE_ID(adr);
				if (reported_part_count == 1 ||
				    ids[j].id.unique_id == unique_id) {
					dev_dbg(dev, "found part_id %#x at link %d\n", part_id, link_id);
					break;
				}
			} else {
				dev_dbg(dev, "part_id %#x reported %d expected %d on link %d, skipping\n",
					part_id, reported_part_count, expected_part_count, link_id);
			}
		}
		if (j == num_slaves) {
			dev_dbg(dev, "Slave part_id %#x not found\n", part_id);
			return false;
		}
	}
	return true;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_sdw_link_slaves_found);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ALSA SoC ACPI module");