From mboxrd@z Thu Jan  1 00:00:00 1970
From: Pavel Machek <pavel@ucw.cz>
Subject: Re: [PATCH V4] leds: trigger: Introduce an USB port trigger
Date: Mon, 10 Oct 2016 16:25:05 +0200
Message-ID: <20161010142505.GA26643@amd>
References: <20160825080546.27182-1-zajec5@gmail.com>
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Cc: Richard Purdie <rpurdie@rpsys.net>, Jacek Anaszewski <j.anaszewski@samsung.com>, Felipe Balbi <balbi@kernel.org>, Greg KH <gregkh@linuxfoundation.org>, Peter Chen <hzpeterchen@gmail.com>, linux-usb@vger.kernel.org, =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <rafal@milecki.pl>, Jonathan Corbet <corbet@lwn.net>, Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>, Boris Brezillon <boris.brezillon@free-electrons.com>, Geert Uytterhoeven <geert@linux-m68k.org>, Stephan Linz <linz@li-pro.net>, open list <linux-kernel@vger.kernel.org>, "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>, "open list:LED SUBSYSTEM" <linux-leds@vger.kernel.org>
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Hi!

> This commit adds a new trigger responsible for turning on LED when USB
> device gets connected to the specified USB port. This can can useful for
> various home routers that have USB port(s) and a proper LED telling user
> a device is connected.
>=20
> The trigger gets its documentation file but basically it just requires
> specifying USB port in a Linux format (e.g. echo 1-1 > new_port).
>=20
> During work on this trigger there was a plan to add DT bindings for it,
> but there wasn't an agreement on the format yet. This can be worked on
> later, a sysfs interface is needed anyway for platforms not using DT.
>=20
> Another planned feature is support for LED reacting to the USB activity.
> This can be implemented with another sysfs file for setting mode. The
> default mode wouldn't change so there won't be ABI breakage and such
> feature can be safely implemented later.

Actually... USB device plugs/unplugs are pretty rare events... Can we
just do this in userspace using udevd?

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

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