On Tue, Dec 17, 2019 at 05:23:13PM +0100, Uwe Kleine-König wrote: > On Tue, Dec 17, 2019 at 04:27:24PM +0100, Greg Kroah-Hartman wrote: > > On Tue, Dec 17, 2019 at 04:07:36PM +0100, Uwe Kleine-König wrote: > > > Usage is as follows: > > > > > > myled=ledname > > > tty=ttyS0 > > > > > > echo tty > /sys/class/leds/$myled/trigger > > > cat /sys/class/tty/$tty/dev > /sys/class/leds/$myled/dev > > > > Is this the correct instructions? Aren't you looking for a major/minor > > number instead in your sysfs file? > > This is correct, yes, at least it works as intended on my machine. > > /sys/class/tty/$tty/dev produces $major:$minor and that's what the > led-trigger consumes. Ugh, nevermind, I totally read that wrong, I was thinking "echo" instead of cat. My fault, what you wrote is correct. Should that be documented somewhere in a Documentation/ABI/ file so that people know how to use this new sysfs file? How are led triggers documented? thanks, greg k-h
