linux-kernel - Re: [RFC 22/25] leds: tm1826: Add combined glyph support

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Message-ID: <20191221210406.GA13125@amd>
Date:   Sat, 21 Dec 2019 22:04:06 +0100
From:   Pavel Machek <pavel@....cz>
To:     Andreas Färber <afaerber@...e.de>
Cc:     linux-realtek-soc@...ts.infradead.org, linux-leds@...r.kernel.org,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Dan Murphy <dmurphy@...com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [RFC 22/25] leds: tm1826: Add combined glyph support

Hi!

> >>Allow to squeeze the text "HEllO" into a 4-digit display,
> >>as seen on MeLE V9 TV box.
> >>
> >>Enable this combining mode only if the text would overflow.
> >
> >"HEll,nO"!
> >
> >:-)
> >
> >Ok, it is kind of cool, but... Can you take a look at
> >drivers/auxdisplay/charlcd.c ? It seems to support some kind of text
> >displays...
> 
> Why don't you look at it before making such a suggestion? ;) It is in no way
> useful, as I pointed out in my cover letter. The only thing related today,
> as Geert pointed out, is in the input subsystem.

Okay, so maybe we should get

AUXILIARY DISPLAY DRIVERS
M:      Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>

on the Cc: list? What you really have is a display, not a bunch of LEDs.

> If you don't want this in leds, you'll have to help make leds subsystem more
> useful to external users - the latest function refactoring has been anything
> but helpful here, as you've seen with the indicators, and we're completely
> lacking any indexing or bulk operations on the LED controller level, since
> you treat each LED as a standalone device. That's precisely why this code is
> here in leds although - as I pointed out - it shouldn't belong here.

Well, your introduction mail was kind of long :-).

If someone wants to do heartbeat on

 --
|  | <- this segment
 --
|  |
 --

they are probably crazy. We may not want to support that. What about
doing it as auxdisplay driver, and then exporting the indicators
around that as LEDs?

Having USB activity trigger on 'USB' icon makes sense, on the other
hand. That would still be supported.

Hmm?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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