1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // soc-apci.c - support for ACPI enumeration.
4 //
5 // Copyright (c) 2013-15, Intel Corporation.
6
7 #include <sound/soc-acpi.h>
8
9 struct snd_soc_acpi_mach *
snd_soc_acpi_find_machine(struct snd_soc_acpi_mach * machines)10 snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
11 {
12 struct snd_soc_acpi_mach *mach;
13
14 for (mach = machines; mach->id[0]; mach++) {
15 if (acpi_dev_present(mach->id, NULL, -1)) {
16 if (mach->machine_quirk)
17 mach = mach->machine_quirk(mach);
18 return mach;
19 }
20 }
21 return NULL;
22 }
23 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
24
snd_soc_acpi_find_package(acpi_handle handle,u32 level,void * context,void ** ret)25 static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
26 void *context, void **ret)
27 {
28 struct acpi_device *adev;
29 acpi_status status = AE_OK;
30 struct snd_soc_acpi_package_context *pkg_ctx = context;
31
32 pkg_ctx->data_valid = false;
33
34 if (acpi_bus_get_device(handle, &adev))
35 return AE_OK;
36
37 if (adev->status.present && adev->status.functional) {
38 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
39 union acpi_object *myobj = NULL;
40
41 status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
42 NULL, &buffer,
43 ACPI_TYPE_PACKAGE);
44 if (ACPI_FAILURE(status))
45 return AE_OK;
46
47 myobj = buffer.pointer;
48 if (!myobj || myobj->package.count != pkg_ctx->length) {
49 kfree(buffer.pointer);
50 return AE_OK;
51 }
52
53 status = acpi_extract_package(myobj,
54 pkg_ctx->format, pkg_ctx->state);
55 if (ACPI_FAILURE(status)) {
56 kfree(buffer.pointer);
57 return AE_OK;
58 }
59
60 kfree(buffer.pointer);
61 pkg_ctx->data_valid = true;
62 return AE_CTRL_TERMINATE;
63 }
64
65 return AE_OK;
66 }
67
snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],struct snd_soc_acpi_package_context * ctx)68 bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
69 struct snd_soc_acpi_package_context *ctx)
70 {
71 acpi_status status;
72
73 status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
74
75 if (ACPI_FAILURE(status) || !ctx->data_valid)
76 return false;
77
78 return true;
79 }
80 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
81
snd_soc_acpi_codec_list(void * arg)82 struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
83 {
84 struct snd_soc_acpi_mach *mach = arg;
85 struct snd_soc_acpi_codecs *codec_list =
86 (struct snd_soc_acpi_codecs *) mach->quirk_data;
87 int i;
88
89 if (mach->quirk_data == NULL)
90 return mach;
91
92 for (i = 0; i < codec_list->num_codecs; i++) {
93 if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
94 return NULL;
95 }
96
97 return mach;
98 }
99 EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
100
101 MODULE_LICENSE("GPL v2");
102 MODULE_DESCRIPTION("ALSA SoC ACPI module");
103
