how to detemine event file node belongs to which device

linux输入子系统，在驱动中注册register_input_device（）时，会在

/dev/input/下生成节点，但是具体如何对应起来了，

这就可以看/proc/bus/input/devices这个文件呢，在这个文件中，

有个Handlers这个后面最后一个就是对应的处理器。

shell.albert@yantai:~> ls -l /dev/input/

total 0

drwxr-xr-x 2 root root 100 May 20 09:36 by-id

drwxr-xr-x 2 root root 240 May 20 09:36 by-path

crw------- 1 root root 13, 64 May 20 09:36 event0

crw------- 1 root root 13, 65 May 20 09:36 event1

crw------- 1 root root 13, 74 May 20 09:36 event10

crw------- 1 root root 13, 75 May 20 09:36 event11

crw------- 1 root root 13, 76 May 20 09:36 event12

crw------- 1 root root 13, 77 May 20 09:36 event13

crw------- 1 root root 13, 78 May 20 09:36 event14

crw------- 1 root root 13, 79 May 20 09:36 event15

crw------- 1 root root 13, 66 May 20 09:36 event2

crw------- 1 root root 13, 67 May 20 09:36 event3

crw------- 1 root root 13, 68 May 20 09:36 event4

crw------- 1 root root 13, 69 May 20 09:36 event5

crw------- 1 root root 13, 70 May 20 09:36 event6

crw------- 1 root root 13, 71 May 20 09:36 event7

crw------- 1 root root 13, 72 May 20 09:36 event8

crw------- 1 root root 13, 73 May 20 09:36 event9

crw------- 1 root root 13, 63 May 20 09:36 mice

crw------- 1 root root 13, 32 May 20 09:36 mouse0

crw------- 1 root root 13, 33 May 20 09:36 mouse1

crw------- 1 root root 13, 34 May 20 09:36 mouse2

shell.albert@yantai:~>

shell.albert@yantai:~> cat /proc/bus/input/devices


I: Bus=0011 Vendor=0001 Product=0001 Version=ab41

N: Name="AT Translated Set 2 keyboard"

P: Phys=isa0060/serio0/input0

S: Sysfs=/devices/platform/i8042/serio0/input/input0

U: Uniq=

H: Handlers=sysrq kbd event0

B: PROP=0

B: EV=120013

B: KEY=402000000 3803078f800d001 feffffdfffefffff fffffffffffffffe

B: MSC=10

B: LED=7

I: Bus=0011 Vendor=0002 Product=0007 Version=01b1

N: Name="SynPS/2 Synaptics TouchPad"

P: Phys=isa0060/serio4/input0

S: Sysfs=/devices/platform/i8042/serio4/input/input8

U: Uniq=

H: Handlers=mouse0 event1

B: PROP=9

B: EV=b

B: KEY=6420 30000 0 0 0 0

B: ABS=260800011000003

I: Bus=0003 Vendor=093a Product=2510 Version=0111

N: Name="PixArt USB Optical Mouse"

P: Phys=usb-0000:00:1d.0-2/input0

S: Sysfs=/devices/pci0000:00/0000:00:1d.0/usb6/6-2/6-2:1.0/0003:093A:2510.0001/input/input10

U: Uniq=

H: Handlers=mouse1 event2

B: PROP=0

B: EV=17

B: KEY=70000 0 0 0 0

B: REL=103

B: MSC=10

I: Bus=0011 Vendor=0002 Product=000a Version=0000

N: Name="TPPS/2 IBM TrackPoint"

P: Phys=synaptics-pt/serio0/input0

S: Sysfs=/devices/platform/i8042/serio4/serio5/input/input9

U: Uniq=

H: Handlers=mouse2 event3

B: PROP=0

B: EV=7

B: KEY=70000 0 0 0 0

B: REL=3

I: Bus=0019 Vendor=0000 Product=0005 Version=0000

N: Name="Lid Switch"

P: Phys=PNP0C0D/button/input0

S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0D:00/input/input11

U: Uniq=

H: Handlers=event4

B: PROP=0

B: EV=21

B: SW=1

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/input12

U: Uniq=

H: Handlers=kbd event5

B: PROP=0

B: EV=3

B: KEY=10000000000000 0

I: Bus=0019 Vendor=0000 Product=0003 Version=0000

N: Name="Sleep Button"

P: Phys=PNP0C0E/button/input0

S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0E:00/input/input13

U: Uniq=

H: Handlers=kbd event6

B: PROP=0

B: EV=3

B: KEY=4000 0 0

I: Bus=0019 Vendor=0000 Product=0001 Version=0000

N: Name="Power Button"

P: Phys=LNXPWRBN/button/input0

S: Sysfs=/devices/LNXSYSTM:00/LNXPWRBN:00/input/input14

U: Uniq=

H: Handlers=kbd event7

B: PROP=0

B: EV=3

B: KEY=10000000000000 0

I: Bus=0019 Vendor=0000 Product=0006 Version=0000

N: Name="Video Bus"

P: Phys=LNXVIDEO/video/input0

S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/LNXVIDEO:00/input/input15

U: Uniq=

H: Handlers=kbd event8

B: PROP=0

B: EV=3

B: KEY=3e000b00000000 0 0 0

I: Bus=0010 Vendor=001f Product=0001 Version=0100

N: Name="PC Speaker"

P: Phys=isa0061/input0

S: Sysfs=/devices/platform/pcspkr/input/input16

U: Uniq=

H: Handlers=kbd event9

B: PROP=0

B: EV=40001

B: SND=6

I: Bus=0019 Vendor=17aa Product=5054 Version=4101

N: Name="ThinkPad Extra Buttons"

P: Phys=thinkpad_acpi/input0

S: Sysfs=/devices/platform/thinkpad_acpi/input/input17

U: Uniq=

H: Handlers=kbd event10 rfkill

B: PROP=0

B: EV=33

B: KEY=18040000 0 10000000000000 0 1501b02102004 c000080021104000 10e000000000000 0

B: MSC=10

B: SW=a

I: Bus=0000 Vendor=0000 Product=0000 Version=0000

N: Name="HDA ATI HDMI HDMI/DP,pcm=3"

P: Phys=ALSA

S: Sysfs=/devices/pci0000:00/0000:00:01.0/0000:01:00.1/sound/card1/input18

U: Uniq=

H: Handlers=event11

B: PROP=0

B: EV=21

B: SW=140

I: Bus=0001 Vendor=10ec Product=0269 Version=0001

N: Name="HDA Digital PCBeep"

P: Phys=card0/codec#0/beep0

S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card0/hdaudioC0D0/input19

U: Uniq=

H: Handlers=kbd event12

B: PROP=0

B: EV=40001

B: SND=6

I: Bus=0000 Vendor=0000 Product=0000 Version=0000

N: Name="HDA Intel Mic"

P: Phys=ALSA

S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card0/input20

U: Uniq=

H: Handlers=event13

B: PROP=0

B: EV=21

B: SW=10

I: Bus=0000 Vendor=0000 Product=0000 Version=0000

N: Name="HDA Intel Headphone"

P: Phys=ALSA

S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card0/input21

U: Uniq=

H: Handlers=event14

B: PROP=0

B: EV=21

B: SW=4

I: Bus=0003 Vendor=17ef Product=4815 Version=1015

N: Name="Integrated Camera"

P: Phys=usb-0000:00:1d.7-6/button

S: Sysfs=/devices/pci0000:00/0000:00:1d.7/usb2/2-6/2-6:1.0/input/input22

U: Uniq=

H: Handlers=kbd event15

B: PROP=0

B: EV=3

B: KEY=100000 0 0 0

shell.albert@yantai:~>