linux-kernel - Re: [PATCH v2 0/9] Add support for Microsoft Surface System Aggregator Module

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Message-Id: <1b4fe1fd-592d-4a88-b156-fbf6af2df428@www.fastmail.com>
Date:   Sun, 06 Dec 2020 17:58:32 +0900
From:   Blaž Hrastnik <blaz@...n.io>
To:     "Hans de Goede" <hdegoede@...hat.com>,
        "Leon Romanovsky" <leon@...nel.org>,
        "Maximilian Luz" <luzmaximilian@...il.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        "Mark Gross" <mgross@...ux.intel.com>,
        "Andy Shevchenko" <andy.shevchenko@...il.com>,
        Barnabás Pőcze <pobrn@...tonmail.com>,
        "Arnd Bergmann" <arnd@...db.de>, "Rob Herring" <robh@...nel.org>,
        "Jiri Slaby" <jirislaby@...nel.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        "Len Brown" <lenb@...nel.org>,
        "Steven Rostedt" <rostedt@...dmis.org>,
        "Ingo Molnar" <mingo@...hat.com>,
        "Masahiro Yamada" <masahiroy@...nel.org>,
        "Michal Marek" <michal.lkml@...kovi.net>,
        "Jonathan Corbet" <corbet@....net>,
        "Dorian Stoll" <dorian.stoll@...p.io>,
        platform-driver-x86@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 0/9] Add support for Microsoft Surface System Aggregator Module

> 
> > More on that, the whole purpose of proposed interface is to debug and
> > not intended to be used by any user space code.
> 
> The purpose is to provide raw access to the Surface Serial Hub protocol,
> just like we provide raw access to USB devices and have hidraw devices.
> 
> So this goes a litle beyond just debugging; and eventually the choice
> may be made to implement some functionality with userspace drivers,
> just like we do for some HID and USB devices.
> 
> Still I agree with you that adding new userspace API is something which
> needs to be considered carefully. So I will look at this closely when
> reviewing this set.

To add to that: this was previously a debugfs interface but was moved to misc after review on the initial RFC:
https://lkml.org/lkml/2020/9/24/96