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From: Richard Purdie <rpurdie@rpsys.net>
To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: "Márton Németh" <nm127@freemail.hu>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [GIT PULL] LED updates
Date: Thu, 07 Feb 2008 22:13:08 +0000	[thread overview]
Message-ID: <1202422388.9519.123.camel@dax.rpnet.com> (raw)
In-Reply-To: <20080207213845.GA27862@khazad-dum.debian.net>

On Thu, 2008-02-07 at 19:38 -0200, Henrique de Moraes Holschuh wrote:
> On Thu, 07 Feb 2008, Richard Purdie wrote:
> > Márton Németh:
> >       leds: Add support for hardware accelerated LED flashing
> >       leds: hw acceleration for Clevo mail LED driver
> 
> This one has a loose end: when you call brightness_set on a led with
> hardware flash acceleration, you will leave the trigger armed, BUT the led
> won't blink anymore.  That's just wrong.

Agreed.

> Either we should always remove *any* (hardware accelerated or not!) active
> trigger when a write to brightness_set is done, or the stuff about "calling
> brightness_set will disable the hardware accelerated blink" has to go.
> 
> I personally prefer that we would always remove any active trigger if
> brightness_set is to be called.  IMHO, it is neater, and it is also the
> least-surprise-behaviour from an user perspective with the LED_OFF:LED_FULL
> triggers we have right now.

Even without the hardware acceleration, a user write to set_brightness
leaves any active trigger active and isn't really intuitive or right
either. 

> Which one will be?  If it is "remove any active trigger", I'd not mind
> writing the patch.

I'll accept a patch for that :).

> > Richard Purdie:
> >       leds: Standardise LED naming scheme
> 
> This one causes trouble (at least on 2.6.23 -- I backported the patch) due
> to the 20-byte length limit on sysfs names.  I had to use "tp::<somecrap>"
> instead of "thinkpad::<somecrap>" to name LEDs, and still had to reduce
> ultrabase_battery to ultrabase_batt :-)
> 
> Anyway, IMHO, the LED function should come first, and we should not even
> need the led driver name anywhere.  In case of clashes in the class sysfs
> dir, just tack a .# to the end or somesuch.  The device the LED is tied to
> already differentiates them.  That would save a lot of chars for something
> much more useful (the function).

Ouch, I'm looking into this. I wish I'd known about it earlier. I agree
function is more important but didn't want to break the existing
convention. I guess this limitation comes from the kobjects involved...

Richard





  reply	other threads:[~2008-02-07 22:13 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-07 10:35 Richard Purdie
2008-02-07 21:38 ` Henrique de Moraes Holschuh
2008-02-07 22:13   ` Richard Purdie [this message]
2008-02-07 23:23     ` [PATCH] leds: disable triggers on brightness set Henrique de Moraes Holschuh
2008-02-10 11:52       ` Németh Márton
2008-02-17 23:30         ` Richard Purdie
2008-02-18  1:59           ` Henrique de Moraes Holschuh
2008-02-08  7:03     ` [GIT PULL] LED updates Németh Márton
2008-02-08 11:20       ` Henrique de Moraes Holschuh
2008-02-10 11:52         ` Németh Márton
2008-03-16 18:18     ` Henrique de Moraes Holschuh
2008-03-16 19:29       ` Richard Purdie
2008-03-16 19:48         ` Henrique de Moraes Holschuh
2008-03-17  3:34           ` LED naming standard for LED class Henrique de Moraes Holschuh
2008-03-17  9:51             ` Richard Purdie
2008-03-18  3:35               ` Henrique de Moraes Holschuh
2008-03-18  4:55                 ` Henrique de Moraes Holschuh
  -- strict thread matches above, loose matches on Subject: below --
2007-10-11 21:38 [GIT PULL] LED updates Richard Purdie
2007-07-16  8:39 Richard Purdie
2007-02-15 22:18 Richard Purdie

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