audio: add get_micropones() function

The Google VTS tests for Android VtsHalAudioV5_0Target(GetMicrophonesTest)
needs to use pointer of function (*get_micropones)() which is not initialized
and function adev_get_microphones() required for initialization witch is
not implemented in tinyhal.

The analysis of the implementation of the audio hal for Qualcomm
(https://android.googlesource.com/platform/hardware/qcom/audio/+/refs/heads/
master/hal/audio_hw.c) and Goldfish
(https://android.googlesource.com/device/generic/goldfish/+/dc18a59%5E%21/)
have been made. The implementation similar to Goldfish(stub) has been chosen as
basic.

Function adev_get_microphones() was implemented as stub function that will
expand in the future. This function fill array audio_microphone_characteristic_t
with default microphone information.

Signed-off-by: Anton Dehtiarov <anton.dehtiarov@globallogic.com>

Author: AntonDehtiarov

audio/audio_hw.c

@@ -2036,6 +2036,48 @@ static int do_init_in_pcm(struct stream_in_pcm *in,
     return 0;
 }
 
+static int adev_get_microphones(const struct audio_hw_device *dev,
+                       struct audio_microphone_characteristic_t *mic_array,
+                       size_t *mic_count)
+{
+    if (mic_count == NULL) {
+        return -ENOSYS;
+    }
+
+    if (*mic_count == 0) {
+        *mic_count = 1;
+        return 0;
+    }
+
+    if (mic_array == NULL) {
+        return -ENOSYS;
+    }
+
+    strncpy(mic_array->device_id, "mic_generic", AUDIO_MICROPHONE_ID_MAX_LEN - 1);
+    mic_array->device = AUDIO_DEVICE_IN_BUILTIN_MIC;
+    strncpy(mic_array->address, AUDIO_BOTTOM_MICROPHONE_ADDRESS,
+            AUDIO_DEVICE_MAX_ADDRESS_LEN - 1);
+    memset(mic_array->channel_mapping, AUDIO_MICROPHONE_CHANNEL_MAPPING_UNUSED,
+           sizeof(mic_array->channel_mapping));
+    mic_array->location = AUDIO_MICROPHONE_LOCATION_UNKNOWN;
+    mic_array->group = 0;
+    mic_array->index_in_the_group = 0;
+    mic_array->sensitivity = AUDIO_MICROPHONE_SENSITIVITY_UNKNOWN;
+    mic_array->max_spl = AUDIO_MICROPHONE_SPL_UNKNOWN;
+    mic_array->min_spl = AUDIO_MICROPHONE_SPL_UNKNOWN;
+    mic_array->directionality = AUDIO_MICROPHONE_DIRECTIONALITY_UNKNOWN;
+    mic_array->num_frequency_responses = 0;
+    mic_array->geometric_location.x = AUDIO_MICROPHONE_COORDINATE_UNKNOWN;
+    mic_array->geometric_location.y = AUDIO_MICROPHONE_COORDINATE_UNKNOWN;
+    mic_array->geometric_location.z = AUDIO_MICROPHONE_COORDINATE_UNKNOWN;
+    mic_array->orientation.x = AUDIO_MICROPHONE_COORDINATE_UNKNOWN;
+    mic_array->orientation.y = AUDIO_MICROPHONE_COORDINATE_UNKNOWN;
+    mic_array->orientation.z = AUDIO_MICROPHONE_COORDINATE_UNKNOWN;
+
+    *mic_count = 1;
+    return 0;   
+}
+
 /*********************************************************************
  * Stream open and close
  *********************************************************************/
@@ -2343,6 +2385,7 @@ static int adev_open(const hw_module_t *module, const char *name,
     adev->hw_device.open_input_stream = adev_open_input_stream;
     adev->hw_device.close_input_stream = adev_close_input_stream;
     adev->hw_device.dump = adev_dump;
+    adev->hw_device.get_microphones = adev_get_microphones;
 
     property_get("ro.product.device", property, "generic");
     snprintf(file_name, sizeof(file_name), "%s/audio.%s.xml", ETC_PATH, property);