Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[linux-2.6-microblaze.git] / sound / soc / soc-acpi.c
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 <linux/export.h>
8 #include <linux/module.h>
9 #include <sound/soc-acpi.h>
10
11 struct snd_soc_acpi_mach *
12 snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
13 {
14         struct snd_soc_acpi_mach *mach;
15         struct snd_soc_acpi_mach *mach_alt;
16
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);
21                                 if (!mach_alt)
22                                         continue; /* not full match, ignore */
23                                 mach = mach_alt;
24                         }
25
26                         return mach;
27                 }
28         }
29         return NULL;
30 }
31 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
32
33 static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
34                                              void *context, void **ret)
35 {
36         struct acpi_device *adev;
37         acpi_status status;
38         struct snd_soc_acpi_package_context *pkg_ctx = context;
39
40         pkg_ctx->data_valid = false;
41
42         if (acpi_bus_get_device(handle, &adev))
43                 return AE_OK;
44
45         if (adev->status.present && adev->status.functional) {
46                 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
47                 union acpi_object  *myobj = NULL;
48
49                 status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
50                                                 NULL, &buffer,
51                                                 ACPI_TYPE_PACKAGE);
52                 if (ACPI_FAILURE(status))
53                         return AE_OK;
54
55                 myobj = buffer.pointer;
56                 if (!myobj || myobj->package.count != pkg_ctx->length) {
57                         kfree(buffer.pointer);
58                         return AE_OK;
59                 }
60
61                 status = acpi_extract_package(myobj,
62                                         pkg_ctx->format, pkg_ctx->state);
63                 if (ACPI_FAILURE(status)) {
64                         kfree(buffer.pointer);
65                         return AE_OK;
66                 }
67
68                 kfree(buffer.pointer);
69                 pkg_ctx->data_valid = true;
70                 return AE_CTRL_TERMINATE;
71         }
72
73         return AE_OK;
74 }
75
76 bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
77                                 struct snd_soc_acpi_package_context *ctx)
78 {
79         acpi_status status;
80
81         status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
82
83         if (ACPI_FAILURE(status) || !ctx->data_valid)
84                 return false;
85
86         return true;
87 }
88 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
89
90 struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
91 {
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;
95         int i;
96
97         if (mach->quirk_data == NULL)
98                 return mach;
99
100         for (i = 0; i < codec_list->num_codecs; i++) {
101                 if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
102                         return NULL;
103         }
104
105         return mach;
106 }
107 EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
108
109 MODULE_LICENSE("GPL v2");
110 MODULE_DESCRIPTION("ALSA SoC ACPI module");