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From: Patrick Lai <plai@codeaurora.org>
To: alsa-devel <alsa-devel@alsa-project.org>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>, lrg@ti.com
Subject: Mixer control for signed gain value
Date: Wed, 22 Jun 2011 23:32:19 -0700	[thread overview]
Message-ID: <4E02DDF3.2070509@codeaurora.org> (raw)

Hi,

The CODEC I am working with takes byte-long gain value in two's 
complement form.
In soc-core.c, the closest functions I see are
  snd_soc_info_volsw_s8
snd_soc_get_volsw_s8
snd_soc_set_volsw_s8

These functions are coded to work with two integer values. For my
purpose, I suppose that I can always set 2nd integer input as zero.
However, would I still be able to set volume like
amixer sset "Codec Gain" 100 as percentage. If yes, how will amixer
know to put upper 8 bits of 16 bit gain in 2nd integer value element?

Thanks
Patrick


-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

             reply	other threads:[~2011-06-23  6:32 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-23  6:32 Patrick Lai [this message]
2011-06-23 10:37 ` Mixer control for signed gain value Mark Brown
2011-06-28 16:21   ` Patrick Lai
2011-06-28 16:32     ` Mark Brown

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