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 <sound/soc-acpi.h>
   8
   9 struct snd_soc_acpi_mach *
  10 snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
  11 {
  12         struct snd_soc_acpi_mach *mach;
  13         struct snd_soc_acpi_mach *mach_alt;
  14
  15         for (mach = machines; mach->id[0]; mach++) {
  16                 if (acpi_dev_present(mach->id, NULL, -1)) {
  17                         if (mach->machine_quirk) {
  18                                 mach_alt = mach->machine_quirk(mach);
  19                                 if (!mach_alt)
  20                                         continue; /* not full match, ignore */
  21                                 mach = mach_alt;
  22                         }
  23
  24                         return mach;
  25                 }
  26         }
  27         return NULL;
  28 }
  29 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
  30
  31 static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
  32                                              void *context, void **ret)
  33 {
  34         struct acpi_device *adev;
  35         acpi_status status = AE_OK;
  36         struct snd_soc_acpi_package_context *pkg_ctx = context;
  37
  38         pkg_ctx->data_valid = false;
  39
  40         if (acpi_bus_get_device(handle, &adev))
  41                 return AE_OK;
  42
  43         if (adev->status.present && adev->status.functional) {
  44                 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
  45                 union acpi_object  *myobj = NULL;
  46
  47                 status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
  48                                                 NULL, &buffer,
  49                                                 ACPI_TYPE_PACKAGE);
  50                 if (ACPI_FAILURE(status))
  51                         return AE_OK;
  52
  53                 myobj = buffer.pointer;
  54                 if (!myobj || myobj->package.count != pkg_ctx->length) {
  55                         kfree(buffer.pointer);
  56                         return AE_OK;
  57                 }
  58
  59                 status = acpi_extract_package(myobj,
  60                                         pkg_ctx->format, pkg_ctx->state);
  61                 if (ACPI_FAILURE(status)) {
  62                         kfree(buffer.pointer);
  63                         return AE_OK;
  64                 }
  65
  66                 kfree(buffer.pointer);
  67                 pkg_ctx->data_valid = true;
  68                 return AE_CTRL_TERMINATE;
  69         }
  70
  71         return AE_OK;
  72 }
  73
  74 bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
  75                                 struct snd_soc_acpi_package_context *ctx)
  76 {
  77         acpi_status status;
  78
  79         status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
  80
  81         if (ACPI_FAILURE(status) || !ctx->data_valid)
  82                 return false;
  83
  84         return true;
  85 }
  86 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
  87
  88 struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
  89 {
  90         struct snd_soc_acpi_mach *mach = arg;
  91         struct snd_soc_acpi_codecs *codec_list =
  92                 (struct snd_soc_acpi_codecs *) mach->quirk_data;
  93         int i;
  94
  95         if (mach->quirk_data == NULL)
  96                 return mach;
  97
  98         for (i = 0; i < codec_list->num_codecs; i++) {
  99                 if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
 100                         return NULL;
 101         }
 102
 103         return mach;
 104 }
 105 EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
 106
 107 MODULE_LICENSE("GPL v2");
 108 MODULE_DESCRIPTION("ALSA SoC ACPI module");