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7730bb13 KM |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // | |
3 | // soc-apci.c - support for ACPI enumeration. | |
4 | // | |
5 | // Copyright (c) 2013-15, Intel Corporation. | |
95f09801 | 6 | |
261e9082 PG |
7 | #include <linux/export.h> |
8 | #include <linux/module.h> | |
7feb2f78 | 9 | #include <sound/soc-acpi.h> |
95f09801 | 10 | |
7feb2f78 PLB |
11 | struct snd_soc_acpi_mach * |
12 | snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines) | |
95f09801 | 13 | { |
7feb2f78 | 14 | struct snd_soc_acpi_mach *mach; |
a3e620f8 | 15 | struct snd_soc_acpi_mach *mach_alt; |
95f09801 | 16 | |
7827d669 | 17 | for (mach = machines; mach->id[0]; mach++) { |
0d5ea120 | 18 | if (acpi_dev_present(mach->id, NULL, -1)) { |
a3e620f8 KJ |
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 | ||
5c256045 | 26 | return mach; |
7827d669 N |
27 | } |
28 | } | |
95f09801 VK |
29 | return NULL; |
30 | } | |
7feb2f78 | 31 | EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine); |
8ceffd22 | 32 | |
7feb2f78 PLB |
33 | static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level, |
34 | void *context, void **ret) | |
34218947 PLB |
35 | { |
36 | struct acpi_device *adev; | |
37 | acpi_status status = AE_OK; | |
7feb2f78 | 38 | struct snd_soc_acpi_package_context *pkg_ctx = context; |
34218947 PLB |
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 | ||
7feb2f78 PLB |
76 | bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN], |
77 | struct snd_soc_acpi_package_context *ctx) | |
34218947 PLB |
78 | { |
79 | acpi_status status; | |
80 | ||
7feb2f78 | 81 | status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL); |
34218947 PLB |
82 | |
83 | if (ACPI_FAILURE(status) || !ctx->data_valid) | |
84 | return false; | |
85 | ||
86 | return true; | |
87 | } | |
7feb2f78 | 88 | EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid); |
34218947 | 89 | |
7feb2f78 | 90 | struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg) |
54746dab | 91 | { |
7feb2f78 PLB |
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; | |
54746dab N |
95 | int i; |
96 | ||
97 | if (mach->quirk_data == NULL) | |
98 | return mach; | |
99 | ||
100 | for (i = 0; i < codec_list->num_codecs; i++) { | |
0d5ea120 | 101 | if (!acpi_dev_present(codec_list->codecs[i], NULL, -1)) |
54746dab N |
102 | return NULL; |
103 | } | |
104 | ||
105 | return mach; | |
106 | } | |
7feb2f78 | 107 | EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list); |
54746dab | 108 | |
8ceffd22 | 109 | MODULE_LICENSE("GPL v2"); |
7feb2f78 | 110 | MODULE_DESCRIPTION("ALSA SoC ACPI module"); |