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-rw-r--r--sound/soc/soc-acpi.c129
1 files changed, 129 insertions, 0 deletions
diff --git a/sound/soc/soc-acpi.c b/sound/soc/soc-acpi.c
new file mode 100644
index 000000000..142476f13
--- /dev/null
+++ b/sound/soc/soc-acpi.c
@@ -0,0 +1,129 @@
+// 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);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ALSA SoC ACPI module");