dts檔案修改：

  qcom,audio-routing =
   "RX_BIAS", "MCLK",
   "LDO_H", "MCLK",
   "SPK_OUT", "MCLK",
   "SPK_OUT", "EXT_VDD_SPKR",
   "Lineout_1 amp", "LINEOUT1",
   "Lineout_2 amp", "LINEOUT2",
   "AMIC1", "MIC BIAS1 External",
   "MIC BIAS1 External", "Handset Mic",
   "AMIC2", "MIC BIAS2 External",
   "MIC BIAS2 External", "Headset Mic",
   "AMIC3", "MIC BIAS1 External",
   "MIC BIAS1 External", "ANCRight Headset Mic",
修改對應的Mic名稱，如second mic，再在msm8226.c裡面修改對應名稱的widget。

在build.prop裡面設定 ro.qc.sdk.audio.fluencetype=fluence（none，fluence，fluencepro），然後adb push ./build.prop /system/ ; adb shell ; chmod 0644 /system/build.prop ;

跟下程式碼：

(platform.c)

platform_init()  ->property_get("ro.qc.sdk.audio.fluencetype", value, ""); -> else if (!strncmp("fluence", value, sizeof("fluence"))) {my_data->fluence_type = FLUENCE_DUAL_MIC;} ->

platform_get_input_snd_device(); ->

if (out_device & AUDIO_DEVICE_OUT_EARPIECE ||
            out_device & AUDIO_DEVICE_OUT_WIRED_HEADPHONE) {
            if (my_data->fluence_type == FLUENCE_NONE ||
                my_data->fluence_in_voice_call == false) {
                snd_device = SND_DEVICE_IN_HANDSET_MIC;
            } else {
                snd_device = SND_DEVICE_IN_VOICE_DMIC;
                adev->acdb_settings |= DMIC_FLAG;
            }
        }

return snd_device ;

->

(audio_hw.c)

select_devices(); ->

  in_snd_device = platform_get_input_snd_device(adev->platform, usecase->stream.out->devices);

所以最後會把SND_DEVICE_IN_VOICE_DMIC 傳給in_snd_device .可在以下log看到；

  ALOGD("%s: out_snd_device(%d: %s) in_snd_device(%d: %s)", __func__,
          out_snd_device, platform_get_snd_device_name(out_snd_device),
          in_snd_device,  platform_get_snd_device_name(in_snd_device));  ->const char *platform_get_snd_device_name(snd_device_t snd_device)
{
    if (snd_device >= SND_DEVICE_MIN && snd_device < SND_DEVICE_MAX)
        return device_table[snd_device];
    else
        return "";
} ->

device_table[snd_device]就是在platform.h中定義的名稱[SND_DEVICE_IN_VOICE_DMIC] = "voice-dmic-ef",

再追下acdb的程式碼：

enable_snd_device() ->   (audio_hw.c)

platform_send_audio_calibration() ->(plaform.c)

acdb_dev_id = acdb_device_table[snd_device];

my_data->acdb_send_audio_cal(acdb_dev_id, acdb_dev_type);  ->(acdb-loader.c)

acdb_loader_send_audio_cal();

雙mic的驗證：

1， mm-audio-ftm 做工廠測試

2，使用tinymix命令

3，使用QACT工具

4，使用QXDM log， 如果是雙mic 會抓到如下節點

11-12.15-23.isf.0x158A.pcm.0x140.VPTX_ECNEAR_IN.0x1.tx.wav

11-12.15-23.isf.0x158A.pcm.0x140.VPTX_ECNEAR_IN.0x2.tx.wav

直觀聽聲音就行！

分析：需要開啟log檔案：

1， echo -n "file wcd9306.c +p" > /sys/kernel/debug/dynamic_debug/control
      echo -n "file msm8226.c +p" > /sys/kernel/debug/dynamic_debug/control
      echo -n "file soc-dapm.c +p" > /sys/kernel/debug/dynamic_debug/control

2，#define LOG_NDEBUG 0 分別在platform.c和audio_hw.c