linux-kernel - Re: n900 audio: any ideas how to get headset speaker to work?

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Message-ID: <CAK7bGn+NH9BOB25+dhNZXFxY_fD8TeoWvuSpTD-4cg-zU5dOmA@mail.gmail.com>
Date:	Sun, 15 Feb 2015 15:45:27 +0100
From:	Patrik Bachan aka DiGGiT <patrikbachan@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	pali.rohar@...il.com, sre@...ian.org, sre@...g0.de,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
	aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com
Subject: Re: n900 audio: any ideas how to get headset speaker to work?

2015-02-15 11:21 GMT+01:00 Pavel Machek <pavel@....cz>:
> Hi!
>
> By default, output goes to loudspeaker (top right relative to
> keyboard). Any ideas how to switch it to the speaker on the left or
> wired headset? Because I suspect that echo cancelation is not going to
> be simple...
>                                                                         Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Hi,
in case of direct alsa output (not PA), setup is pretty complex.
Headphones referenced as line. All audio outputs are differential.
Here are controls that affects volumes...

global:
 PCM (volume)
 left/right DAC mux (below)
      -- DAC_L1/R1 passes sound to loudspeakers, line, (maybe others)
      -- DAC_L2/R2 passes sound to loudspeakers, NOT line, (maybe others)
      -- DAC_L3/R3 passes sound to NOT loudspeakers, line, (maybe others)
      if DAC_L1/R1 is chosen, you can hear lower volume on both
outputs in compare to dedicated outputs (DAC_L2/R2, DAC_L3/R3),
probabbly due to higher load of ADC


loudspeakers:
 Speaker function (on)
 HP (unmute)
 HP DAC (volume)
 left HP Mixer DACL1 (below)
 right HP Mixer DACR1 (below)
   --unmute theese two,  this will pass left channel sound to left
channel output and vice versa
 left HP Mixer DACR1 (below)
 right HP Mixer DACL1 (below)
  --mute these two, this controls channel crosstalk ( amount of left
channel sound going to right channel output and vice versa)

line:
 line (unmute)
 line DAC (volume)
 jack function (headphone)
 TPA6130A2 Headphone (volume)
 left Line Mixer DACL1 (below)
 right Line Mixer DACR1 (below)
   --unmute theese two,  this will pass left channel sound to left
channel output and vice versa
 left Line Mixer DACR1 (below)
 right Line Mixer DACL1 (below)
  --mute these two, this controls channel crosstalk ( amount of left
channel sound going to right channel output and vice versa)
--
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