linux-kernel - Re: [RFC] [ALSA][CONTROL] Added 2 ioctls for reading/writing values of multiple controls in one go (at once)

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Date:   Fri, 03 Feb 2017 08:24:28 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     "Takashi Sakamoto" <o-takashi@...amocchi.jp>
Cc:     <alsa-devel@...a-project.org>,
        "Satendra Singh Thakur" <satendra.t@...sung.com>, <perex@...ex.cz>,
        <hemanshu.s@...sung.com>, <nishant.s4@...sung.com>,
        <ycheon.song@...sung.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [ALSA][CONTROL] Added 2 ioctls for reading/writing values of multiple controls in one go (at once)

On Thu, 02 Feb 2017 04:45:48 +0100,
Takashi Sakamoto wrote:
> 
> Hi,
> 
> On Feb 2 2017 12:14, Satendra Singh Thakur wrote:
> > From: satendra singh thakur <satendra.t@...sung.com>
> >
> > -Added 2 ioctls in alsa driver's control interface
> > -Added an ioctl to read values of multiple elements at once
> > -Added an ioctl to write values of multiple elements at once
> > -In the absence of above ioctls user needs to call N ioctls to
> >  read/write value of N elements which requires N context switches
> > -Proposed ioctls will allow accessing N elements' values in a single
> >  context switch
> > -Above mentioned ioctl will be useful for alsa utils such as amixer
> >  which reads all controls of given sound card
> >
> > Signed-off-by: Satendra Singh Thakur <satendra.t@...sung.com>
> > ---
> >  include/uapi/sound/asound.h |    8 +++++
> >  sound/core/control.c        |   69 +++++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 77 insertions(+)
> 
> I'm _strongly_ interested in your two patches, because it has a
> potentiality to purge ASoC abuse of TLV feature, which was introduced
> in  2014 with a bad reviewing process.

I don't think it can be a replacement for the extended TLV usages.
The proposed API is nothing but a loop of ctl elem read/write, and I'm
not sure whether it worth to introduce the new ioctls just for that.


Takashi