linux-kernel - Re: [PATCH v13 48/53] ALSA: usb-audio: mixer: Add USB offloading mixer control

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Message-ID: <878r3w7o9a.wl-tiwai@suse.de>
Date: Wed, 07 Feb 2024 08:00:01 +0100
From: Takashi Iwai <tiwai@...e.de>
To: Wesley Cheng <quic_wcheng@...cinc.com>
Cc: <srinivas.kandagatla@...aro.org>,
	<mathias.nyman@...el.com>,
	<perex@...ex.cz>,
	<conor+dt@...nel.org>,
	<corbet@....net>,
	<lgirdwood@...il.com>,
	<andersson@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>,
	<gregkh@...uxfoundation.org>,
	<Thinh.Nguyen@...opsys.com>,
	<broonie@...nel.org>,
	<bgoswami@...cinc.com>,
	<tiwai@...e.com>,
	<robh+dt@...nel.org>,
	<konrad.dybcio@...aro.org>,
	<linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-sound@...r.kernel.org>,
	<linux-usb@...r.kernel.org>,
	<linux-arm-msm@...r.kernel.org>,
	<linux-doc@...r.kernel.org>,
	<alsa-devel@...a-project.org>
Subject: Re: [PATCH v13 48/53] ALSA: usb-audio: mixer: Add USB offloading mixer control

On Wed, 07 Feb 2024 02:24:46 +0100,
Wesley Cheng wrote:
> 
> Hi Takashi,
> 
> On 2/6/2024 4:57 AM, Takashi Iwai wrote:
> > On Sat, 03 Feb 2024 03:36:40 +0100,
> > Wesley Cheng wrote:
> >> 
> >> In order to allow userspace/applications know about USB offloading status,
> >> expose a sound kcontrol that fetches information about which sound card
> >> index is associated with the ASoC platform card supporting offloading.  In
> >> the USB audio offloading framework, the ASoC BE DAI link is the entity
> >> responsible for registering to the SOC USB layer.  SOC USB will expose more
> >> details about the current offloading status, which includes the USB sound
> >> card and USB PCM device indexes currently being used.
> >> 
> >> Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
> > 
> > The concept is understandable, but the control element name ("SNDUSB
> > OFFLD playback available") looks non-intrusive and non-conformant.
> > Use a bit more understandable name instead.
> > 
> > This provides a card number where the offload driver is bound, and the
> > name should indicate something about that.
> > 
> 
> Hmmm, does USB sound have a naming convention that it usually follows
> for mixer/control interfaces?

The old rule is found in Documentation/sound/designs/control-names.rst
(although the prefix and the suffix are often dropped for non-standard
controls).

> For something that is more closely related, how about:
> "USB offload capable card"

Yes, it looks better.  But usually each word begins with an upper
letter.


Takashi