【Qualcomm高通音频】Lineout 调试记录

一、熟悉原理图

分析如下：直接从模块的LINE_OUT两处PIN脚接到音频功放AW8733的输入，然后喇叭接在PA的输出端。

二、音频路由定义

对应代码路径为：kernel/msm-3.18/sound/soc/codecs/msm8x16-wcd.c

将以下代码：

 static const struct snd_soc_dapm_route audio_map[] = {

     {"LINEOUT", NULL, "LINEOUT PA"},

     {"LINEOUT PA", NULL, "SPK_RX_BIAS"},

     {"LINEOUT PA", NULL, "LINE_OUT"},

     {"LINE_OUT", "Switch", "LINEOUT DAC"},

     {"LINEOUT DAC", NULL, "RX3 CHAIN"},
 ｝；

调整为：

 static const struct snd_soc_dapm_route audio_map[] = {

     {"LINEOUT", NULL, "LINEOUT PA"},

     {"LINEOUT PA", NULL, "SPK_RX_BIAS"},

     {"LINEOUT PA", NULL, "LINE_OUT"},

     {"LINE_OUT", "Switch", "Ext Spk Switch"},

     {"Ext Spk Switch", "On", "LINEOUT DAC"},

     {"LINEOUT DAC", NULL, "RX3 CHAIN"},

 ｝；

三、音频路由配置

把以下xml配置：

   
       
       
       
       
       
       
       
   

修改为：