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// 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_status status;
struct snd_soc_acpi_package_context *pkg_ctx = context;
pkg_ctx->data_valid = false;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
if (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);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("ALSA SoC ACPI module");
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