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kernel/linux-imx6_3.14.28/Documentation/sound/alsa/ControlNames.txt 2.08 KB
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  This document describes standard names of mixer controls.
  
  Syntax: SOURCE [DIRECTION] FUNCTION
  
  DIRECTION:
    <nothing>	(both directions)
    Playback
    Capture
    Bypass Playback
    Bypass Capture
  
  FUNCTION:
    Switch	(on/off switch)
    Volume
    Route		(route control, hardware specific)
  
  SOURCE:
    Master
    Master Mono
    Hardware Master
    Speaker	(internal speaker)
    Headphone
    Beep		(beep generator)
    Phone
    Phone Input
    Phone Output
    Synth
    FM
    Mic
    Line
    CD
    Video
    Zoom Video
    Aux
    PCM
    PCM Front
    PCM Rear
    PCM Pan
    Loopback
    Analog Loopback	(D/A -> A/D loopback)
    Digital Loopback	(playback -> capture loopback - without analog path)
    Mono
    Mono Output
    Multi
    ADC
    Wave
    Music
    I2S
    IEC958
  
  Exceptions:
    [Digital] Capture Source
    [Digital] Capture Switch	(aka input gain switch)
    [Digital] Capture Volume	(aka input gain volume)
    [Digital] Playback Switch	(aka output gain switch)
    [Digital] Playback Volume	(aka output gain volume)
    Tone Control - Switch
    Tone Control - Bass
    Tone Control - Treble
    3D Control - Switch
    3D Control - Center
    3D Control - Depth
    3D Control - Wide
    3D Control - Space
    3D Control - Level
    Mic Boost [(?dB)]
  
  PCM interface:
  
    Sample Clock Source	{ "Word", "Internal", "AutoSync" }
    Clock Sync Status	{ "Lock", "Sync", "No Lock" }
    External Rate		/* external capture rate */
    Capture Rate		/* capture rate taken from external source */
  
  IEC958 (S/PDIF) interface:
  
    IEC958 [...] [Playback|Capture] Switch	/* turn on/off the IEC958 interface */
    IEC958 [...] [Playback|Capture] Volume	/* digital volume control */
    IEC958 [...] [Playback|Capture] Default	/* default or global value - read/write */
    IEC958 [...] [Playback|Capture] Mask		/* consumer and professional mask */
    IEC958 [...] [Playback|Capture] Con Mask	/* consumer mask */
    IEC958 [...] [Playback|Capture] Pro Mask	/* professional mask */
    IEC958 [...] [Playback|Capture] PCM Stream	/* the settings assigned to a PCM stream */
    IEC958 Q-subcode [Playback|Capture] Default	/* Q-subcode bits */
    IEC958 Preamble [Playback|Capture] Default	/* burst preamble words (4*16bits) */