linux-kernel - Re: [PATCH v1 3/4] ASoC: tda7802: Add enable device attribute

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 13 Jun 2019 19:14:43 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Thomas Preston <thomas.preston@...ethink.co.uk>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Marco Felsch <m.felsch@...gutronix.de>,
        Paul Cercueil <paul@...pouillou.net>,
        Kirill Marinushkin <kmarinushkin@...dec.tech>,
        Cheng-Yi Chiang <cychiang@...omium.org>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Vinod Koul <vkoul@...nel.org>,
        Annaliese McDermond <nh6z@...z.net>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/4] ASoC: tda7802: Add enable device attribute

On Tue, Jun 11, 2019 at 06:49:08PM +0100, Thomas Preston wrote:
> Add a device attribute to control the enable regulator. Write 1 to
> enable, 0 to disable (ref-count minus one), or -1 to force disable the
> physical pin.

> To disable a set of amplifiers wired to the same enable gpio, each
> device must be disabled. For example:

> 	echo 0 > /sys/devices/.../device:00/enable
> 	echo 0 > /sys/devices/.../device:01/enable

This is adding a new ABI completely outstide the standard ALSA and power
management frameworks and ABIs with no explanation as to why or
integration with the rest of the driver.  This is obviously not in the
slightest bit OK.  If there's something missing from the frameworks
extend the frameworks, don't just ignore them.

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)