linux-kernel - Cutiepi, serdevs, and right way to handle its power button

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Message-ID: <20220920205637.GA17170@duo.ucw.cz>
Date:   Tue, 20 Sep 2022 22:56:37 +0200
From:   Pavel Machek <pavel@....cz>
To:     kernel list <linux-kernel@...r.kernel.org>, robh@...nel.org,
        linux-serial@...r.kernel.org, ribalda@...nel.org,
        andriy.shevchenko@...ux.intel.com, johan@...nel.org
Subject: Cutiepi, serdevs, and right way to handle its power button

Hi!

Cutiepie is a small handheld tablet. It has embedded controller
connected via serial to the main system, handling stuff such as power
button and battery percentage. Currently they are using userland
deamon for communication, but I believe that should eventually go into
kernel.

For debugging, it would be really nice to be able to attach my module
to given serdev. Is such thing possible? I see "[PATCH v2 00/19]
Dynamically load/remove serdev devices via sysfs*" series
(https://www.spinics.net/lists/linux-serial/msg30732.html) but I'm not
sure if equivalent functionality exists in mainline kernel?

Is there some kind of similar hardware already supported by mainline?
Using driver as a reference might be easier than starting from
scratch.

Thanks and best regards,
								Pavel

-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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