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 static acpi_status snd_soc_acpi_mach_match(acpi_handle handle, u32 level,
  53                                        void *context, void **ret)
  54 {
  55         unsigned long long sta;
  56         acpi_status status;
  57
  58         *(bool *)context = true;
  59         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
  60         if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_PRESENT))
  61                 *(bool *)context = false;
  62
  63         return AE_OK;
  64 }
  65
  66 bool snd_soc_acpi_check_hid(const u8 hid[ACPI_ID_LEN])
  67 {
  68         acpi_status status;
  69         bool found = false;
  70
  71         status = acpi_get_devices(hid, snd_soc_acpi_mach_match, &found, NULL);
  72
  73         if (ACPI_FAILURE(status))
  74                 return false;
  75
  76         return found;
  77 }
  78 EXPORT_SYMBOL_GPL(snd_soc_acpi_check_hid);
  79
  80 struct snd_soc_acpi_mach *
  81 snd_soc_acpi_find_machine(struct snd_soc_acpi_mach *machines)
  82 {
  83         struct snd_soc_acpi_mach *mach;
  84
  85         for (mach = machines; mach->id[0]; mach++) {
  86                 if (snd_soc_acpi_check_hid(mach->id) == true) {
  87                         if (mach->machine_quirk == NULL)
  88                                 return mach;
  89
  90                         if (mach->machine_quirk(mach) != NULL)
  91                                 return mach;
  92                 }
  93         }
  94         return NULL;
  95 }
  96 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_machine);
  97
  98 static acpi_status snd_soc_acpi_find_package(acpi_handle handle, u32 level,
  99                                              void *context, void **ret)
 100 {
 101         struct acpi_device *adev;
 102         acpi_status status = AE_OK;
 103         struct snd_soc_acpi_package_context *pkg_ctx = context;
 104
 105         pkg_ctx->data_valid = false;
 106
 107         if (acpi_bus_get_device(handle, &adev))
 108                 return AE_OK;
 109
 110         if (adev->status.present && adev->status.functional) {
 111                 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 112                 union acpi_object  *myobj = NULL;
 113
 114                 status = acpi_evaluate_object_typed(handle, pkg_ctx->name,
 115                                                 NULL, &buffer,
 116                                                 ACPI_TYPE_PACKAGE);
 117                 if (ACPI_FAILURE(status))
 118                         return AE_OK;
 119
 120                 myobj = buffer.pointer;
 121                 if (!myobj || myobj->package.count != pkg_ctx->length) {
 122                         kfree(buffer.pointer);
 123                         return AE_OK;
 124                 }
 125
 126                 status = acpi_extract_package(myobj,
 127                                         pkg_ctx->format, pkg_ctx->state);
 128                 if (ACPI_FAILURE(status)) {
 129                         kfree(buffer.pointer);
 130                         return AE_OK;
 131                 }
 132
 133                 kfree(buffer.pointer);
 134                 pkg_ctx->data_valid = true;
 135                 return AE_CTRL_TERMINATE;
 136         }
 137
 138         return AE_OK;
 139 }
 140
 141 bool snd_soc_acpi_find_package_from_hid(const u8 hid[ACPI_ID_LEN],
 142                                 struct snd_soc_acpi_package_context *ctx)
 143 {
 144         acpi_status status;
 145
 146         status = acpi_get_devices(hid, snd_soc_acpi_find_package, ctx, NULL);
 147
 148         if (ACPI_FAILURE(status) || !ctx->data_valid)
 149                 return false;
 150
 151         return true;
 152 }
 153 EXPORT_SYMBOL_GPL(snd_soc_acpi_find_package_from_hid);
 154
 155 struct snd_soc_acpi_mach *snd_soc_acpi_codec_list(void *arg)
 156 {
 157         struct snd_soc_acpi_mach *mach = arg;
 158         struct snd_soc_acpi_codecs *codec_list =
 159                 (struct snd_soc_acpi_codecs *) mach->quirk_data;
 160         int i;
 161
 162         if (mach->quirk_data == NULL)
 163                 return mach;
 164
 165         for (i = 0; i < codec_list->num_codecs; i++) {
 166                 if (snd_soc_acpi_check_hid(codec_list->codecs[i]) != true)
 167                         return NULL;
 168         }
 169
 170         return mach;
 171 }
 172 EXPORT_SYMBOL_GPL(snd_soc_acpi_codec_list);
 173
 174 MODULE_LICENSE("GPL v2");
 175 MODULE_DESCRIPTION("ALSA SoC ACPI module");