111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// soc-apci.c - support for ACPI enumeration.
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//
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// Copyright (c) 2013-15, Intel Corporation.
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#include <linux/export.h>
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#include <linux/module.h>
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#include <sound/soc-acpi.h>
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struct snd_soc_acpi_mach *
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snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
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{
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struct snd_soc_acpi_mach *mach;
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struct snd_soc_acpi_mach *mach_alt;
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for (mach = machines; mach->id[0]; mach++) {
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if (acpi_dev_present(mach->id, NULL, -1)) {
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if (mach->machine_quirk) {
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mach_alt = mach->machine_quirk(mach);
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if (!mach_alt)
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continue; /* not full match, ignore */
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mach = mach_alt;
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}
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return mach;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
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static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
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void *context, void **ret)
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{
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struct acpi_device *adev;
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acpi_status status = AE_OK;
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struct snd_soc_acpi_package_context *pkg_ctx = context;
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pkg_ctx->data_valid = false;
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if (acpi_bus_get_device(handle, &adev))
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return AE_OK;
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if (adev->status.present && adev->status.functional) {
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struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
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union acpi_object *myobj = NULL;
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status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
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NULL, &buffer,
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ACPI_TYPE_PACKAGE);
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if (ACPI_FAILURE(status))
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return AE_OK;
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myobj = buffer.pointer;
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if (!myobj || myobj->package.count != pkg_ctx->length) {
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kfree(buffer.pointer);
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return AE_OK;
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}
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status = acpi_extract_package(myobj,
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pkg_ctx->format, pkg_ctx->state);
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if (ACPI_FAILURE(status)) {
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kfree(buffer.pointer);
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return AE_OK;
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}
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kfree(buffer.pointer);
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pkg_ctx->data_valid = true;
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return AE_CTRL_TERMINATE;
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}
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return AE_OK;
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}
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bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
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struct snd_soc_acpi_package_context *ctx)
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{
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acpi_status status;
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status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
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if (ACPI_FAILURE(status) || !ctx->data_valid)
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return false;
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return true;
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}
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EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
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struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
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{
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struct snd_soc_acpi_mach *mach = arg;
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struct snd_soc_acpi_codecs *codec_list =
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(struct snd_soc_acpi_codecs *) mach->quirk_data;
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int i;
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if (mach->quirk_data == NULL)
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return mach;
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for (i = 0; i < codec_list->num_codecs; i++) {
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if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
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return NULL;
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}
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return mach;
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}
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EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("ALSA SoC ACPI module");
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