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/*
* soc-apci.c - support for ACPI enumeration.
*
* Copyright (c) 2013-15, Intel Corporation.
*
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <sound/soc-acpi.h>
static acpi_status snd_soc_acpi_find_name(acpi_handle handle, u32 level,
void *context, void **ret)
{
struct acpi_device *adev;
const char *name = NULL;
if (acpi_bus_get_device(handle, &adev))
return AE_OK;
if (adev->status.present && adev->status.functional) {
name = acpi_dev_name(adev);
*(const char **)ret = name;
return AE_CTRL_TERMINATE;
}
return AE_OK;
}
const char *snd_soc_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN])
{
const char *name = NULL;
acpi_status status;
status = acpi_get_devices(hid, snd_soc_acpi_find_name, NULL,
(void **)&name);
if (ACPI_FAILURE(status) || name[0] == '\0')
return NULL;
return name;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_find_name_from_hid);
static acpi_status snd_soc_acpi_mach_match(acpi_handle handle, u32 level,
void *context, void **ret)
{
unsigned long long sta;
acpi_status status;
*(bool *)context = true;
status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
*(bool *)context = false;
return AE_OK;
}
bool snd_soc_acpi_check_hid(const u8 hid[ACPI_ID_LEN])
{
acpi_status status;
bool found = false;
status = acpi_get_devices(hid, snd_soc_acpi_mach_match, &found, NULL);
if (ACPI_FAILURE(status))
return false;
return found;
}
EXPORT_SYMBOL_GPL(snd_soc_acpi_check_hid);
struct snd_soc_acpi_mach *
snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
{
struct snd_soc_acpi_mach *mach;
for (mach = machines; mach->id[0]; mach++) {
if (snd_soc_acpi_check_hid(mach->id) == true) {
if (mach->machine_quirk)
mach = mach->machine_quirk(mach);
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 = AE_OK;
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 (snd_soc_acpi_check_hid(codec_list->codecs[i]) != true)
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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