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

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Message-ID: <YysjjSXao4MERCwQ@smile.fi.intel.com>
Date:   Wed, 21 Sep 2022 17:45:33 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Pavel Machek <pavel@....cz>
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 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?

-- 
With Best Regards,
Andy Shevchenko