Date: Fri, 3 Sep 2004 14:06:34 +0200
From: Jan-Benedict Glaw <jbglaw@lug-owl.de>
To: Kalin KOZHUHAROV <kalin@thinrope.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2.6.8.1 0/2] leds: new class for led devices
Message-ID: <20040903120634.GK6985@lug-owl.de>
Mail-Followup-To: Kalin KOZHUHAROV <kalin@thinrope.net>,
	linux-kernel@vger.kernel.org
References: <1094157190l.4235l.2l@hydra> <ch8tdd$1uf$1@sea.gmane.org>
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On Fri, 2004-09-03 13:54:04 +0900, Kalin KOZHUHAROV <kalin@thinrope.net>
wrote in message <ch8tdd$1uf$1@sea.gmane.org>:
> John Lenz wrote:
> >This is an attempt to provide an alternative to the current arm =20
> >specific led interface.  This arm interface does not integrate well =20
> >with the device model and sysfs.
> I am just curious, but what specific hardware devices can be controlled=
=20
> with this?

For example, the smaller VAX computers offer 8 LEDs which show system
status during IPL. After boot finished, the OS may use them...

> >function : a read/write attribute that sets the current function of =20
> > timer : the led blinks on and off on a timer
> > idle : the led turns off when the system is idle and on when not idle
> > power : the led represents the current power state
> > user : the led is controlled by user space

Is idle/timer/power hardware-controlled (eg. by a secondary processor,
direct chipset implementation) or is switching on/off controlled by
kernel (eg. heartbeat, IO and ethernet for the LEDs you can find on some
PA-RISC machines)?

MfG, JBG

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