getevent & sendevent 的分析应用
一. 命令说明
root@android:/ # 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
显示格式说明
root@android:/ # getevent
/dev/input/event5: 0005 0002 00000001
device的名字：事件类型 键码类别 具体的数值
/dev/input/event5: 0000 0000 00000000
表示一次输入结束
/*
* Event types
*/
#define EV_SYN 0x00
#define EV_KEY 0x01
#define EV_REL 0x02
#define EV_ABS 0x03
#define EV_MSC 0x04
#define EV_SW 0x05
#define EV_LED 0x11
#define EV_SND 0x12
#define EV_REP 0x14
#define EV_FF 0x15
#define EV_PWR 0x16
#define EV_FF_STATUS 0x17
#define EV_MAX 0x1f
#define EV_CNT (EV_MAX+1)
root@android:/ # sendevent
命令格式 sendevent [device] [type] [code] [value]
二. 具体应用, 比如需要查看audio jack的事件，也就是耳机的插入
1. 首先确认耳机插入的事件是啥
root@android:/ # getevent -i
add device 1: /dev/input/event2
bus: 0000
vendor 0000
product 0000
version 0000
name: "pmic8xxx_pwrkey"
location: "pmic8xxx_pwrkey/input0"
id: ""
version: 1.0.1
events:
KEY (0001): 0074
input props:
<none>
.....
add device 5: /dev/input/event10
bus: 0000
vendor 0000
product 0000
version 0000
name: "msm8960-snd-card Headset Jack"
location: "ALSA"
id: ""
version: 1.0.1
events:
SW (0005): 0002* 0004* 0006 000e 000f 0010
input props:
<none>
add device 6: /dev/input/event9
bus: 0000
vendor 0000
product 0000
version 0000
name: "msm8960-snd-card Button Jack"
location: "ALSA"
id: ""
version: 1.0.1
events:
KEY (0001): 0100 0101 0102 0103 0104 0105 0106 0107
input props:
<none>
2. 输出 audio jack事件
用的event type是#define EV_SW 0x05
/*
* Switch events
*/
#define SW_LID 0x00 /* set = lid shut */
#define SW_TABLET_MODE 0x01 /* set = tablet mode */
#define SW_HEADPHONE_INSERT 0x02 /* set = inserted */
#define SW_RFKILL_ALL 0x03 /* rfkill master switch, type "any"
set = radio enabled */
#define SW_RADIO SW_RFKILL_ALL /* deprecated */
#define SW_MICROPHONE_INSERT 0x04 /* set = inserted */
#define SW_DOCK 0x05 /* set = plugged into dock */
#define SW_LINEOUT_INSERT 0x06 /* set = inserted */
#define SW_JACK_PHYSICAL_INSERT 0x07 /* set = mechanical switch set */
#define SW_VIDEOOUT_INSERT 0x08 /* set = inserted */
#define SW_CAMERA_LENS_COVER 0x09 /* set = lens covered */
#define SW_KEYPAD_SLIDE 0x0a /* set = keypad slide out */
#define SW_FRONT_PROXIMITY 0x0b /* set = front proximity sensor active */
#define SW_ROTATE_LOCK 0x0c /* set = rotate locked/disabled */
#define SW_LINEIN_INSERT 0x0d /* set = inserted */
#define SW_HPHL_OVERCURRENT 0x0e /* set = over current on left hph */
#define SW_HPHR_OVERCURRENT 0x0f /* set = over current on right hph */
#define SW_UNSUPPORT_INSERT 0x10 /* set = unsupported device inserted */
#define SW_MAX 0x20
#define SW_CNT (SW_MAX+1)
root@android:/ # getevent /dev/input/event10
0005 0002 00000001 (0002 表示earphone)
0005 0004 00000001 (0004 表示microphone)
0000 0000 00000000
| 插入 | 拔出 | |
| Headset | 0005 0002 00000001 0005 0004 00000001 0000 0000 00000000 |
0005 0002 00000000 0005 0004 00000000 0000 0000 00000000 |
| Headphone | 0005 0002 00000001 0000 0000 00000000 |
0005 0002 00000000 0000 0000 00000000 |
| invalid | 0005 0010 00000001 0000 0000 00000000 |
0005 0010 00000000 0000 0000 00000000 |
三、具体应用, 比如需要查看touch的事件
1、确认touch事件路径
root@android:/ # getevent -i
add device 13: /dev/input/event7
bus: 0000
vendor 0000
product 0000
version 0000
name: "cyttsp4_mt"
location: "cyttsp4_mt.main_ttsp_core"
id: ""
version: 1.0.1
events:
ABS (0003): 0000 : value 0, min 0, max 0, fuzz 0, flat 0, resolution 0
2、touch 事件
用的event type是#define EV_ABS 0x03
只分析多touch事件
#define ABS_MT_SLOT 0x2f /* MT slot being modified */
#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */
#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis (omit if circular) */
#define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */
#define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis (omit if circular) */
#define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */
#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */
#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */
#define ABS_MT_TOOL_TYPE 0x37 /* Type of touching device */
#define ABS_MT_BLOB_ID 0x38 /* Group a set of packets as a blob */
#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */
#define ABS_MT_PRESSURE 0x3a /* Pressure on contact area */
#define ABS_MT_DISTANCE 0x3b /* Contact hover distance */
root@android:/ # getevent /dev/input/event7
单点触摸
0003 0039 000000d5 //触点区分的唯一ID
0003 0035 00000165 //触点的x坐标
0003 0036 000002fa //触点的y坐标
0003 003a 00000025 //触点的压力，实际上是接触区域大小
0000 0000 00000000 //结束
多点触摸
0003 0039 000000de
0003 0035 00000140
0003 0036 0000047f
0003 003a 00000021
0000 0000 00000000
0003 0035 0000013f
0003 003a 00000027
0003 002f 00000001 //切换上报其中一点
0003 0039 000000df
0003 0035 000001fd
0003 0036 000001e3
0003 003a 00000022
0000 0000 00000000
0003 002f 00000000 //切换上报其中一点
0003 0036 0000047e
0003 003a 0000002b
0000 0000 00000000
0003 0036 0000047d
0003 003a 0000002f
0000 0000 00000000
0003 0036 0000047b
0003 003a 00000034
0003 002f 00000001 //切换上报其中一点
0003 0035 000001fc
0003 0036 000001e6
0003 003a 00000023
0000 0000 00000000
＠system/core/toolbox/getevent.c
int getevent_main(int argc, char *argv[])
{
const char *device_path = "/dev/input"; //读取的路径
....
res = scan_dir(device_path, print_flags); //扫描路径下的所有文件路径
....
while(1) {
...
res = read(ufds[i].fd, &event, sizeof(event)); //读取事件
...
print_event(event.type, event.code, event.value, print_flags); //打印出事件信息
}
}
四、sendevent源代码分析
@system/core/toolbox/sendevent.c
五、sendevent用法例子
1. 模拟插入耳机， 这时候可以启动收音机了（不再有耳机没有的提示框）
sendevent /dev/input/event10 0005 0002 00000001
sendevent /dev/input/event10 0000 0000 00000000