sound/soc/soc-acpi.c

   1 /*
   2  * soc-apci.c - support for ACPI enumeration.
   3  *
   4  * Copyright (c) 2013-15, Intel Corporation.
   5  *
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms and conditions of the GNU General Public License,
   9  * version 2, as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  */
  16
  17 #include <sound/soc-acpi.h>
  18
  19 static acpi_status snd_soc_acpi_find_name(acpi_handle handle, u32 level,
  20                                       void *context, void **ret)
  21 {
  22         struct acpi_device *adev;
  23         const char *name = NULL;
  24
  25         if (acpi_bus_get_device(handle, &adev))
  26                 return AE_OK;
  27
  28         if (adev->status.present && adev->status.functional) {
  29                 name = acpi_dev_name(adev);
  30                 *(const char **)ret = name;
  31                 return AE_CTRL_TERMINATE;
  32         }
  33
  34         return AE_OK;
  35 }
  36
  37 const char *snd_soc_acpi_find_name_from_hid(const u8 hid[ACPI_ID_LEN])
  38 {
  39         const char *name = NULL;
  40         acpi_status status;
  41
  42         status = acpi_get_devices(hid, snd_soc_acpi_find_name, NULL,
  43                                   (void **)&name);
  44
  45         if (ACPI_FAILURE(status) || name[0] == '\0')
  46                 return NULL;
  47
  48         return name;
  49 }
  50 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_name_from_hid);
  51
  52 struct snd_soc_acpi_mach *
  53 snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
  54 {
  55         struct snd_soc_acpi_mach *mach;
  56
  57         for (mach = machines; mach->id[0]; mach++) {
  58                 if (acpi_dev_present(mach->id, NULL, -1)) {
  59                         if (mach->machine_quirk)
  60                                 mach = mach->machine_quirk(mach);
  61                         return mach;
  62                 }
  63         }
  64         return NULL;
  65 }
  66 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
  67
  68 static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
  69                                              void *context, void **ret)
  70 {
  71         struct acpi_device *adev;
  72         acpi_status status = AE_OK;
  73         struct snd_soc_acpi_package_context *pkg_ctx = context;
  74
  75         pkg_ctx->data_valid = false;
  76
  77         if (acpi_bus_get_device(handle, &adev))
  78                 return AE_OK;
  79
  80         if (adev->status.present && adev->status.functional) {
  81                 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
  82                 union acpi_object  *myobj = NULL;
  83
  84                 status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
  85                                                 NULL, &buffer,
  86                                                 ACPI_TYPE_PACKAGE);
  87                 if (ACPI_FAILURE(status))
  88                         return AE_OK;
  89
  90                 myobj = buffer.pointer;
  91                 if (!myobj || myobj->package.count != pkg_ctx->length) {
  92                         kfree(buffer.pointer);
  93                         return AE_OK;
  94                 }
  95
  96                 status = acpi_extract_package(myobj,
  97                                         pkg_ctx->format, pkg_ctx->state);
  98                 if (ACPI_FAILURE(status)) {
  99                         kfree(buffer.pointer);
 100                         return AE_OK;
 101                 }
 102
 103                 kfree(buffer.pointer);
 104                 pkg_ctx->data_valid = true;
 105                 return AE_CTRL_TERMINATE;
 106         }
 107
 108         return AE_OK;
 109 }
 110
 111 bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
 112                                 struct snd_soc_acpi_package_context *ctx)
 113 {
 114         acpi_status status;
 115
 116         status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
 117
 118         if (ACPI_FAILURE(status) || !ctx->data_valid)
 119                 return false;
 120
 121         return true;
 122 }
 123 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
 124
 125 struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
 126 {
 127         struct snd_soc_acpi_mach *mach = arg;
 128         struct snd_soc_acpi_codecs *codec_list =
 129                 (struct snd_soc_acpi_codecs *) mach->quirk_data;
 130         int i;
 131
 132         if (mach->quirk_data == NULL)
 133                 return mach;
 134
 135         for (i = 0; i < codec_list->num_codecs; i++) {
 136                 if (!acpi_dev_present(codec_list->codecs[i], NULL, -1))
 137                         return NULL;
 138         }
 139
 140         return mach;
 141 }
 142 EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
 143
 144 MODULE_LICENSE("GPL v2");
 145 MODULE_DESCRIPTION("ALSA SoC ACPI module");