input子系统 - getevent - 《Linux/Android系统与驱动》

getevent 指令用于获取 input 输入事件，比如获取按键上报信息、获取触摸屏上报信息等。
指令源码路径：/system/core/toolbox/getevent.c
getevent -h：查看 getevent 帮助信息

# getevent -h
Usage: getevent [-t] [-n] [-s switchmask] [-S] [-v [mask]] [-d] [-p] [-i] [-l] [-q] [-c count] [-r] [device]
    -t: show time stamps
    -n: don't print newlines
    -s: print switch states for given bits
    -S: print all switch states
    -v: verbosity mask (errs=1, dev=2, name=4, info=8, vers=16, pos. events=32, props=64)
    -d: show HID descriptor, if available
    -p: show possible events (errs, dev, name, pos. events)
    -i: show all device info and possible events
    -l: label event types and names in plain text
    -q: quiet (clear verbosity mask)
    -c: print given number of events then exit
    -r: print rate events are received

getevent：显示当前有那些输入设备，数量与 /dev/input 目录下相同
注意：每次重启，event文件节点和重启前的可能不同。

# getevent
add device 1: /dev/input/event1      #说明：这是LonBon自定义的按键
  name:     "LonBon Key"
add device 2: /dev/input/event0
  name:     "Nexell Keypad"
could not get driver version for /dev/input/mouse0, Not a typewriter
add device 3: /dev/input/event2
  name:     "USB OPTICAL MOUSE "
add device 4: /dev/input/event3     #说明：这是Goodix的触摸屏
  name:     "Goodix-TS"
could not get driver version for /dev/input/mice, Not a typewriter

查看触摸屏上报的数据：

# getevent /dev/input/event3
0003 0039 00000000    #触按触摸屏就会有数据上报
0003 0035 0000016b
0003 0036 000002d6
0003 0030 00000026
0003 0032 00000026

-v：根据 mask 值显示相关信息，执行后会一直显示上报数据
errs=1, dev=2, name=4, info=8, vers=16, pos. events=32, props=64
默认显示 dev| name| info| vers = 30;

root@s5p4418_lonbon:/data/dropbear # getevent -v /dev/input/event3
add device 1: /dev/input/event3
  bus:      0018
  vendor    dead
  product   beef
  version   28bb
  name:     "Goodix-TS"
  location: "H▒▒ވ▒▒"
  id:       ""
  version:  1.0.1

root@s5p4418_lonbon:/data/dropbear # getevent -v1 /dev/input/event3

root@s5p4418_lonbon:/data/dropbear # getevent -v30 /dev/input/event3
add device 1: /dev/input/event3
  bus:      0018
  vendor    dead
  product   beef
  version   28bb
  name:     "Goodix-TS"
  location: "H▒▒ވ▒▒"
  id:       ""
  version:  1.0.1

root@s5p4418_lonbon:/data/dropbear # getevent -v2 /dev/input/event3
add device 1: /dev/input/event3

root@s5p4418_lonbon:/data/dropbear # getevent -v4 /dev/input/event3
  name:     "Goodix-TS"

root@s5p4418_lonbon:/data/dropbear # getevent -v8 /dev/input/event3
  bus:      0018
  vendor    dead
  product   beef
  version   28bb
  location: "H▒▒ވ▒▒"
  id:       ""

root@s5p4418_lonbon:/data/dropbear # getevent -v16 /dev/input/event3
  version:  1.0.1

root@s5p4418_lonbon:/data/dropbear # getevent -v32 /dev/input/event3
  events:
    ABS (0003): 002f  : value 0, min 0, max 15, fuzz 0, flat 0, resolution 0
                0030  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                0032  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                0035  : value 0, min 0, max 800, fuzz 0, flat 0, resolution 0
                0036  : value 0, min 0, max 1280, fuzz 0, flat 0, resolution 0
                0039  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0

root@s5p4418_lonbon:/data/dropbear # getevent -v64 /dev/input/event3
input props:
INPUT_PROP_DIRECT

-d：如果设备可用，显示设备隐藏的描述信息

-p：显示设备支持的事件类型和编码方式

root@s5p4418_lonbon:/data/dropbear # getevent -p /dev/input/event3
add device 1: /dev/input/event3
  name:     "Goodix-TS"
  events:
    ABS (0003): 002f  : value 0, min 0, max 15, fuzz 0, flat 0, resolution 0
                0030  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                0032  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                0035  : value 0, min 0, max 800, fuzz 0, flat 0, resolution 0
                0036  : value 0, min 0, max 1280, fuzz 0, flat 0, resolution 0
                0039  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
  input props:
    INPUT_PROP_DIRECT

-i：显示设备的所有信息和支持的事件，比 -p 显示更多信息

root@s5p4418_lonbon:/data/dropbear # getevent -i /dev/input/event3
add device 1: /dev/input/event3
  bus:      0018
  vendor    dead
  product   beef
  version   28bb
  name:     "Goodix-TS"
  location: "H"
  id:       ""
  version:  1.0.1
  events:
    ABS (0003): 002f  : value 0, min 0, max 15, fuzz 0, flat 0, resolution 0
                0030  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                0032  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
                0035  : value 0, min 0, max 800, fuzz 0, flat 0, resolution 0
                0036  : value 0, min 0, max 1280, fuzz 0, flat 0, resolution 0
                0039  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
  input props:
    INPUT_PROP_DIRECT

-l：以文本形式输出事件类型和名称，比 -t 更清楚直观

root@s5p4418_lonbon:/data/dropbear # getevent -l /dev/input/event3
事件类型type     事件码cdode         值 value
EV_ABS          ABS_MT_TRACKING_ID   00000000
EV_ABS          ABS_MT_POSITION_X    00000258
EV_ABS          ABS_MT_POSITION_Y    00000332
EV_SYN          SYN_REPORT           00000000
EV_ABS          ABS_MT_TRACKING_ID   ffffffff
EV_SYN          SYN_REPORT           00000000
EV_ABS          ABS_MT_TRACKING_ID   00000000
EV_ABS          ABS_MT_POSITION_X    0000022a
EV_ABS          ABS_MT_POSITION_Y    000002c3
EV_ABS          ABS_MT_TOUCH_MAJOR   0000002f

-c：打印固定数量的事件并退出
-r：显示事件上报速率

参数可以组合使用，一次性查看需要的触摸屏信息
常用组合：

getevent -i /dev/input/event3 && getevent -tl /dev/input/event3

root@s5p4418_lonbon:/data/dropbear # getevent -i /dev/input/event3 && getevent -tl /dev/input/event3
add device 1: /dev/input/event3
bus:      0018
vendor    dead
product   beef
version   28bb
name:     "Goodix-TS"
location: "▒?▒▒▒▒"
id:       ""
version:  1.0.1
events:
  ABS (0003): 002f  : value 0, min 0, max 15, fuzz 0, flat 0, resolution 0
              0030  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
              0032  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
              0035  : value 0, min 0, max 800, fuzz 0, flat 0, resolution 0
              0036  : value 0, min 0, max 1280, fuzz 0, flat 0, resolution 0
              0039  : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
input props:
  INPUT_PROP_DIRECT
[     290.167572] EV_ABS       ABS_MT_TRACKING_ID   00000000
[     290.167598] EV_ABS       ABS_MT_POSITION_X    0000029e
[     290.167605] EV_ABS       ABS_MT_POSITION_Y    0000034f
[     290.167611] EV_ABS       ABS_MT_TOUCH_MAJOR   00000022
[     290.167615] EV_ABS       ABS_MT_WIDTH_MAJOR   00000022
[     290.167642] EV_SYN       SYN_REPORT           00000000