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From: Arunkumar S on 21 May 2010 10:14
Hi,

My setup has several keyboards of PS2/USB kind connected to the
system. I have to blink LEDs of specific keyboard out of all connected
Keyboards.

I understand that dev node "/dev/console" addresses to the system's
keyboard controller, which is shared by all keyboard connected.

Is there any way to address a specific keyboard and executes IOCTL
command for that keyboard alone.

===========
int fd = open( "/dev/console", 0 );
ioctl( fd, KDSETLED, (( KBD_SCROLLOCK | KBD_NUMLOCK | KBD_CAPSLOCK ) &
KBD_MASK) );
===========


Thanks,
Arun
From: John Reiser on 21 May 2010 11:08
> Is there any way to address a specific keyboard and executes IOCTL
> command for that keyboard alone.

First you must identify the device.
Look at the output from "cat /proc/bus/usb/devices".
Look at the output from "find /sys -print",
specifically /sys/devices/platform/i8042/, /sys/module/keyboard,
/sys/devices/virtual/input, /sys/bus/hid, /sys/devices/.../input/..., etc.
Then see if the driver for that device can do what you want.

--

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