點擊打開鏈接

dts文件修改：

??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里面修改對應名稱的widget。

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

跟下代碼：

(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);

所以最后會把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的代碼：

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：需要打開log文件：

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

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