Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 4 Apr 2019 22:42:07 +0200
From:   Pavel Machek <pavel@ucw.cz>
To:     Dmitry Torokhov <dtor@google.com>
Cc:     Nick Crews <ncrews@chromium.org>,
        Guenter Roeck <groeck@google.com>,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        Benson Leung <bleung@chromium.org>, linux-leds@vger.kernel.org,
        Jacek Anaszewski <jacek.anaszewski@gmail.com>,
        Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Alessandro Zummo <a.zummo@towertech.it>,
        linux-rtc@vger.kernel.org,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Duncan Laurie <dlaurie@chromium.org>,
        Simon Glass <sjg@google.com>
Subject: Re: [PATCH v5 3/3] platform/chrome: Standardize Chrome OS keyboard
 backlight name
Message-ID: <20190404204207.GH29984@amd>
References: <CAHX4x87cQLhZOEDxwBJs=UkDxwGxZOELGjHtp6aFLBWmjyQAFQ@mail.gmail.com>
 <CAE_wzQ8k4vO4yLsr2WNxYQ=-6JDmTsj6OxD0f3P=k8kJYFOD9Q@mail.gmail.com>
 <20190404185919.GB27340@amd>
 <CAE_wzQ-XuK7WOyPm6yXsmjp7z0=T92mMrfn1TVaavaLejcYVGA@mail.gmail.com>
 <20190404191931.GA29984@amd>
 <CAE_wzQ8y8i7C+_tv0CdnbUw0r21g1ggv2YUuzCog1xABivEvWA@mail.gmail.com>
 <20190404200658.GD29984@amd>
 <CAE_wzQ8WcMCzYqvxA_JBZKNza7ca3QE-VShmMxv5++_4F8RR=g@mail.gmail.com>
 <20190404202042.GF29984@amd>
 <CAE_wzQ-8XwzptH7EqNrELxjBzY2+0oHJGB3Va=vZwwK3csu_aA@mail.gmail.com>
MIME-Version: 1.0
Content-Type: multipart/signed; micalg=pgp-sha1;
        protocol="application/pgp-signature"; boundary="TBNym+cBXeFsS4Vs"
Content-Disposition: inline
In-Reply-To: <CAE_wzQ-8XwzptH7EqNrELxjBzY2+0oHJGB3Va=vZwwK3csu_aA@mail.gmail.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk


--TBNym+cBXeFsS4Vs
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

Hi!

> > > And what to do if internal keyboard is not platform but USB? Like
> > > Google "Whiskers"? (I am not sure why you decided to drop my mention
> > > of internal USB keyboards completely off your reply).
> >
> > I don't have answers for everything. Even if you have USB keyboard, you=
'll
> > likely still have backlight connected to embedded controller. If not,
> > then maybe you have exception userland needs to know about.
> >
> > Still better than making everything an exception.
>=20
> You do not need to make everything exception. You just need to look
> beyond the name, and see how the device is connected. And then apply
> your exceptions for "weird" devices.

"Where it is connected" is not interesting to the userland. "Is it
backlight for internal keyboard" is the right question. It may be
connected to embedded controller or some kind of controller over
i2c... my shell scripts should not need to know about architecture of
every notebook out there.

But I don't see why I should do additional work when its trivial for
kernel to just name the LED in an useful way.

"platform::kbd_backlight" has no disadvantages compared to
"wilco::kbd_backlight" ... so lets just use it.

									Pavel
--=20
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blo=
g.html

--TBNym+cBXeFsS4Vs
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: Digital signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iEYEARECAAYFAlymbB8ACgkQMOfwapXb+vJJYwCfX5l28e2wBm03LKaV/yWkOhJj
6jIAoI8ECdVuduZ5jO34B8p1MsEbK8ja
=6gux
-----END PGP SIGNATURE-----

--TBNym+cBXeFsS4Vs--