cat /proc/bus/input/devices dev/input

root@ubuntu:~# ls /dev/input/
by-id  by-path  event0  event1  event2  js0  mice  mouse0
root@ubuntu:~# ls /dev/input/
by-id  by-path  event0  event1  event2  js0  mice  mouse0
root@ubuntu:~#  cat /proc/bus/input/devices
I: Bus=0019 Vendor=0000 Product=0001 Version=0000
N: Name="Power Button"
P: Phys=PNP0C0C/button/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0
U: Uniq=
H: Handlers=kbd event0 
B: PROP=0
B: EV=3
B: KEY=10000000000000 0

I: Bus=0003 Vendor=12d1 Product=0003 Version=0110
N: Name="Keyboard/Mouse KVM 1.1.0"
P: Phys=usb-PNP0D20:00-2.1/input0
S: Sysfs=/devices/platform/PNP0D20:00/usb1/1-2/1-2.1/1-2.1:1.0/0003:12D1:0003.0001/input/input1
U: Uniq=
H: Handlers=sysrq kbd event1 leds 
B: PROP=0
B: EV=120013
B: KEY=1000000000007 ff980000000007ff febeffdfffefffff fffffffffffffffe
B: MSC=10
B: LED=1f

I: Bus=0003 Vendor=12d1 Product=0003 Version=0110
N: Name="Keyboard/Mouse KVM 1.1.0"
P: Phys=usb-PNP0D20:00-2.1/input1
S: Sysfs=/devices/platform/PNP0D20:00/usb1/1-2/1-2.1/1-2.1:1.1/0003:12D1:0003.0002/input/input2
U: Uniq=
H: Handlers=mouse0 event2 js0 
B: PROP=0
B: EV=1b
B: KEY=70000 0 0 0 0
B: ABS=3
B: MSC=10

root@ubuntu:~# ls /proc/bus/input/
devices  handlers
root@ubuntu:~#