1 // SPDX-License-Identifier: GPL-2.0
3 // soc-apci.c - support for ACPI enumeration.
5 // Copyright (c) 2013-15, Intel Corporation.
7 #include <linux/export.h>
8 #include <linux/module.h>
9 #include <sound/soc-acpi.h>
11 struct snd_soc_acpi_mach *
12 snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
14 struct snd_soc_acpi_mach *mach;
15 struct snd_soc_acpi_mach *mach_alt;
17 for (mach = machines; mach->id[0]; mach++) {
18 if (acpi_dev_present(mach->id, NULL, -1)) {
19 if (mach->machine_quirk) {
20 mach_alt = mach->machine_quirk(mach);
22 continue; /* not full match, ignore */
31 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
33 static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
34 void *context, void **ret)
36 struct acpi_device *adev;
38 struct snd_soc_acpi_package_context *pkg_ctx = context;
40 pkg_ctx->data_valid = false;
42 if (acpi_bus_get_device(handle, &adev))
45 if (adev->status.present && adev->status.functional) {
46 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
47 union acpi_object *myobj = NULL;
49 status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
52 if (ACPI_FAILURE(status))
55 myobj = buffer.pointer;
56 if (!myobj || myobj->package.count != pkg_ctx->length) {
57 kfree(buffer.pointer);
61 status = acpi_extract_package(myobj,
62 pkg_ctx->format, pkg_ctx->state);
63 if (ACPI_FAILURE(status)) {
64 kfree(buffer.pointer);
68 kfree(buffer.pointer);
69 pkg_ctx->data_valid = true;
70 return AE_CTRL_TERMINATE;
76 bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
77 struct snd_soc_acpi_package_context *ctx)
81 status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
83 if (ACPI_FAILURE(status) || !ctx->data_valid)
88 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
90 struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
92 struct snd_soc_acpi_mach *mach = arg;
93 struct snd_soc_acpi_codecs *codec_list =
94 (struct snd_soc_acpi_codecs *) mach->quirk_data;
97 if (mach->quirk_data == NULL)
100 for (i = 0; i < codec_list->num_codecs; i++) {
101 if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
107 EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
109 MODULE_LICENSE("GPL v2");
110 MODULE_DESCRIPTION("ALSA SoC ACPI module");