linux-kernel - Re: [PATCH] platform/x86: dell-privacy: Add support for new privacy driver

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Message-ID: <e8e06aca-c3f1-d833-c766-01f05dfa0f37@metux.net>
Date:   Thu, 12 Nov 2020 16:06:13 +0100
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     "Limonciello, Mario" <Mario.Limonciello@...l.com>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        "Yuan, Perry" <Perry.Yuan@...l.com>
Cc:     "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "mgross@...ux.intel.com" <mgross@...ux.intel.com>,
        "pali@...nel.org" <pali@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH] platform/x86: dell-privacy: Add support for new privacy
 driver

On 11.11.20 15:30, Limonciello, Mario wrote:

Hi,

> Pressing the mute key activates a time delayed circuit to physically cut
> off the mute.  The LED is in the same circuit, so it reflects the true
> state of the HW mute.  The reason for the EC "ack" is so that software
> can first invoke a SW mute before the HW circuit is cut off.  Without SW
> cutting this off first does not affect the time delayed muting or status
> of the LED but there is a possibility of a "popping" noise leading to a
> poor user experience.

how long is that timeout ?

> Exposing as an LED device allows the codec drivers notification path to
> EC ACK to work.

Which driver exactly ? Who's gonna access this LED ?


--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287