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

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Message-ID: <20220921171707.GA8443@duo.ucw.cz>
Date:   Wed, 21 Sep 2022 19:17:07 +0200
From:   Pavel Machek <pavel@....cz>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     kernel list <linux-kernel@...r.kernel.org>, robh@...nel.org,
        linux-serial@...r.kernel.org, ribalda@...nel.org, johan@...nel.org
Subject: Re: Cutiepi, serdevs, and right way to handle its power button

On Wed 2022-09-21 17:45:33, Andy Shevchenko wrote:
> On Tue, Sep 20, 2022 at 10:56:37PM +0200, Pavel Machek wrote:
> > 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.
> 
> Is it arm or x86 based tablet?

arm64, but CPU architecture really should not matter.

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

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