Android下event事件深度解析

客官°小女子只卖身不卖艺 2022-07-24 04:29 272阅读 0赞

Android手机下getevent/sendevent，源代码路径system/core/toolbox/下，sendevent.c getevent.c getevent.h

**getevent**

使用getevent获得/dev/input/eventX设备汇报的事件，这个命令还会输出所有event设备的基本信息，

add device 1: /dev/input/event2  
  name:     "qpnp\_pon"  
add device 2: /dev/input/event0  
  name:     "sensorprocessor"  
could not get driver version for /dev/input/mice, Not a typewriter  
add device 3: /dev/input/event5  
  name:     "gpio-keys"  
add device 4: /dev/input/event4  
  name:     "msm8994-florida-snd-card Headset Jack"  
add device 5: /dev/input/event3  
  name:     "msm8994-florida-snd-card Button Jack"  
add device 6: /dev/input/event1  
  name:     "synaptics\_dsx\_i2c"

其中如上对应关系

device 6: /dev/input/event1："synaptics\_dsx\_i2c" ===》显示屏touchscreen

device 3: /dev/input/event5："gpio-keys"              ===》键盘keypad

device 1: /dev/input/event2： "qpnp\_pon"            ===》按键pwrkey

[Android][]可以使用sendevent来模拟触屏，键盘以及其他类型的event事件，

sendevent /dev/input/eventX type code value

/dev/input/eventX 对应一个event设备，可以通过getevent获得可用的event设备

type, code, value的定义可参看kernel/include/linux/input.h和kernel/include/uapi/input.h

**input**

/dev/input目录下的事件都是在驱动中调用input\_register\_device(struct input\_dev \*dev)产生的。

root@:/dev/input \# ll  
ll  
crw-rw---- root     input     13,  64 1970-01-15 11:37 event0  
crw-rw---- root     input     13,  65 1970-01-15 11:37 event1  
crw-rw---- root     input     13,  66 1970-01-15 11:37 event2  
crw-rw---- root     input     13,  67 1970-01-15 11:37 event3  
crw-rw---- root     input     13,  68 1970-01-15 11:37 event4  
crw-rw---- root     input     13,  69 1970-01-15 11:37 event5  
crw-rw---- root     input     13,  63 1970-01-15 11:37 mice

与event对应的相关设备信息位于/proc/bus/input/devices，

root@:/ \# cd proc/bus/input/devices  
cd proc/bus/input/devices  
/system/bin/sh: cd: /proc/bus/input/devices: Not a directory  
2|root@kinzie\_uds:/ \# cat proc/bus/input/devices  
cat proc/bus/input/devices  
I: Bus=0000 Vendor=0000 Product=0000 Version=0000  
N: Name="sensorprocessor"  
P: Phys=  
S: Sysfs=/devices/virtual/input/input0  
U: Uniq=  
H: Handlers=alsa\_to\_h2w switch\_to\_motosh event0 cpufreq keychord  
B: PROP=0  
B: EV=23  
B: KEY=100000 0 10000000000000 0  
B: SW=1  
  
  
I: Bus=0018 Vendor=0000 Product=0000 Version=0000  
N: Name="synaptics\_dsx\_i2c"  
P: Phys=synaptics\_dsx\_i2c/input0  
S: Sysfs=/devices/soc.0/f9924000.i2c/i2c-2/2-0020/input/input1  
U: Uniq=  
H: Handlers=kgsl event1 cpufreq  
B: PROP=2  
B: EV=9  
B: ABS=661800000000000  
  
  
I: Bus=0000 Vendor=0000 Product=0000 Version=0000  
N: Name="qpnp\_pon"  
P: Phys=qpnp\_pon/input0  
S: Sysfs=/devices/virtual/input/input2  
U: Uniq=  
H: Handlers=event2 cpufreq keychord  
B: PROP=10  
B: EV=3  
B: KEY=14000000000000 0  
  
  
I: Bus=0000 Vendor=0000 Product=0000 Version=0000  
N: Name="msm8994-florida-snd-card Button Jack"  
P: Phys=ALSA  
S: Sysfs=/devices/soc.0/fe034000.sound/sound/card0/input3  
U: Uniq=  
H: Handlers=event3 cpufreq keychord  
B: PROP=0  
B: EV=3  
B: KEY=40 0 0 0 0 8e 400000000 0 c000000000000 0  
  
  
I: Bus=0000 Vendor=0000 Product=0000 Version=0000  
N: Name="msm8994-florida-snd-card Headset Jack"  
P: Phys=ALSA  
S: Sysfs=/devices/soc.0/fe034000.sound/sound/card0/input4  
U: Uniq=  
H: Handlers=alsa\_to\_h2w switch\_to\_motosh event4  
B: PROP=0  
B: EV=21  
B: SW=10054  
  
  
I: Bus=0019 Vendor=0001 Product=0001 Version=0100  
N: Name="gpio-keys"  
P: Phys=gpio-keys/input0  
S: Sysfs=/devices/soc.0/gpio\_keys.83/input/input5  
U: Uniq=  
H: Handlers=event5 cpufreq keychord  
B: PROP=0  
B: EV=3  
B: KEY=8000000000000 0

[Android]: http://lib.csdn.net/base/15