linux-kernel - Re: [PATCH] Route keyboard LEDs through the generic LEDs layer.

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Message-ID: <20140407021015.GA8518@core.coreip.homeip.net>
Date:	Sun, 6 Apr 2014 19:10:15 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Pavel Machek <pavel@....cz>,
	David Herrmann <dh.herrmann@...il.com>,
	akpm@...ux-foundation.org, jslaby@...e.cz,
	Bryan Wu <cooloney@...il.com>, rpurdie@...ys.net,
	linux-kernel@...r.kernel.org, Evan Broder <evan@...oder.net>,
	Arnaud Patard <arnaud.patard@...-net.org>,
	Peter Korsgaard <jacmet@...site.dk>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Matt Sealey <matt@...esi-usa.com>,
	Rob Clark <robdclark@...il.com>,
	Niels de Vos <devos@...oraproject.org>,
	linux-arm-kernel@...ts.infradead.org,
	Steev Klimaszewski <steev@...esi-usa.com>, blogic@...nwrt.org,
	Pali Rohár <pali.rohar@...il.com>
Subject: Re: [PATCH] Route keyboard LEDs through the generic LEDs layer.

Hi Samuel,

On Mon, Mar 31, 2014 at 02:23:23PM +0200, Samuel Thibault wrote:
> This permits to reassign keyboard LEDs to something else than keyboard "leds"
> state, by adding keyboard led and modifier triggers connected to a series
> of VT input LEDs, themselves connected to VT input triggers, which
> per-input device LEDs use by default.  Userland can thus easily change the LED
> behavior of (a priori) all input devices, or of particular input devices.
> 

I still have the same concern that I believe I already mentioned a while
ago: how do we reconcile the LED control via triggers with LED control
done through event devices? Currently, as far as I can see, they will be
clashing with each other. I.e. if I remap my capslock led to be the new
shiftlock and then userspace writes EV_LED/LED_CAPSL it would light up
my new "shift lock", right?

Also I wonder if we really need to have the multiplexing (VT-level) leds
in addition to per-device ones.

Thanks.

-- 
Dmitry
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