Hi! > > short version: I have a use case for leds where I want to be able to use > > the triggers in the leds subsystem without having a physical hardware led. > > > > long version: I am working on a program to make one embedded system > > (http://fatcatlab.com/product/evb/) compatible with another > > (http://mindstorms.lego.com). One has physical red/green LEDs, that use the > > gpio leds driver to control them. The other system does not have physical > > leds. However, it does have a color screen. So, my idea is > > to create virtual LEDs on the screen that emulate the physical LEDs on the > > other device. > > > > I would like to make a userspace program that works the same on both > > devices. If the leds were simple on-off, then it would of course be simpler > > to make the virtual leds completely in userspace. However, we are currently > > using other triggers (disk activity/heatbeat/etc.) with the leds. I would > > like for the virtual LEDs to be able to use these triggers as well. > > this is funny since I have just written a ledsim.c using debugfs to emulate a > LED and read out its state via a simple cat command. I found that useful for > testing triggers in the Bluetooth subsystem and see if they behave correctly > without bothering to run this on real hardware. >
Could the device tree be used to bind LED driver to otherwise unused gpio? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html