How to route sgtl5000 audio within the chip?

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                          I have an embedded device with an sgtl5000 audio codec, linked to an iMX8 CPU via SPI.

According to the datasheet, there is a direct route from LINE_IN to HP_OUT, which avoids sound travelling through the SPI connection to the CPU.  

Does ALSA/alsamixer allow me to do this routing, or is it restricted to only those audio flows which traverse the kernel?

---
Using amixer, I can see:

    root@test217:~# amixer 
    Simple mixer control 'Headphone',0
      Capabilities: pvolume pswitch pswitch-joined
      Playback channels: Front Left - Front Right
      Limits: Playback 0 - 127
      Mono:
      Front Left: Playback 89 [70%] [-7.00dB] [on]
      Front Right: Playback 89 [70%] [-7.00dB] [on]
    Simple mixer control 'Headphone Mux',0
      Capabilities: enum
      Items: 'DAC' 'LINE_IN'
      Item0: 'DAC'
    ...

What command lets me switch Headphone Mux>>Item0 from DAC to LINE_IN?


                        

Asked by fadedbee (1113 rep)

Dec 19, 2023, 02:54 PM
Last activity: Dec 19, 2023, 03:34 PM

How to route sgtl5000 audio within the chip?

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