Messages in this thread | | | Date | Fri, 3 Sep 2004 14:06:34 +0200 | From | Jan-Benedict Glaw <> | Subject | Re: [PATCH 2.6.8.1 0/2] leds: new class for led devices |
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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 > >specific led interface. This arm interface does not integrate well > >with the device model and sysfs. > I am just curious, but what specific hardware devices can be controlled > 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 > > 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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