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event.go
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event.go
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package input
import (
"encoding/binary"
"io"
"syscall"
"time"
)
// We need the input_event struct from https://android.googlesource.com/platform/system/core/+/froyo-release/toolbox/sendevent.c
/*
struct input_event {
struct timeval time;
__u16 type;
__u16 code;
__s32 value;
};
*/
/*
$ getevent
add device 7: /dev/input/event1
name: "synaptics_dsx"
events:
KEY (0001): KEY_WAKEUP BTN_TOOL_FINGER BTN_TOUCH
ABS (0003): ABS_X : value 0, min 0, max 1079, fuzz 0, flat 0, resolution 0
ABS_Y : value 0, min 0, max 2159, fuzz 0, flat 0, resolution 0
ABS_MT_SLOT : value 0, min 0, max 9, fuzz 0, flat 0, resolution 0
ABS_MT_TOUCH_MAJOR : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
ABS_MT_TOUCH_MINOR : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
ABS_MT_POSITION_X : value 0, min 0, max 1079, fuzz 0, flat 0, resolution 0
ABS_MT_POSITION_Y : value 0, min 0, max 2159, fuzz 0, flat 0, resolution 0
ABS_MT_TRACKING_ID : value 0, min 0, max 65535, fuzz 0, flat 0, resolution 0
input props:
INPUT_PROP_DIRECT
add device 7: /dev/input/event1
name: "synaptics_dsx"
events:
KEY (0001): 008f 0145 014a
ABS (0003): 0000 : value 0, min 0, max 1079, fuzz 0, flat 0, resolution 0
0001 : value 0, min 0, max 2159, fuzz 0, flat 0, resolution 0
002f : value 0, min 0, max 9, fuzz 0, flat 0, resolution 0
0030 : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
0031 : value 0, min 0, max 255, fuzz 0, flat 0, resolution 0
0035 : value 0, min 0, max 1079, fuzz 0, flat 0, resolution 0
0036 : value 0, min 0, max 2159, fuzz 0, flat 0, resolution 0
0039 : value 0, min 0, max 65535, fuzz 0, flat 0, resolution 0
input props:
INPUT_PROP_DIRECT
*/
/*
Putting finger in top left corner:
$ getevent
/dev/input/event1: 0003 0039 000000e7
/dev/input/event1: 0001 014a 00000001
/dev/input/event1: 0001 0145 00000001
/dev/input/event1: 0003 0035 00000078
/dev/input/event1: 0003 0036 000000e2
/dev/input/event1: 0003 0030 00000006
/dev/input/event1: 0000 0000 00000000
/dev/input/event1: 0003 0039 ffffffff
/dev/input/event1: 0001 014a 00000000
/dev/input/event1: 0001 0145 00000000
/dev/input/event1: 0000 0000 00000000
Same thing:
$ getevent
/dev/input/event1: EV_ABS ABS_MT_TRACKING_ID 000000e8
/dev/input/event1: EV_KEY BTN_TOUCH DOWN
/dev/input/event1: EV_KEY BTN_TOOL_FINGER DOWN
/dev/input/event1: EV_ABS ABS_MT_POSITION_X 0000007a
/dev/input/event1: EV_ABS ABS_MT_POSITION_Y 000000a3
/dev/input/event1: EV_ABS ABS_MT_TOUCH_MAJOR 00000005
/dev/input/event1: EV_SYN SYN_REPORT 00000000
/dev/input/event1: EV_ABS ABS_MT_TOUCH_MAJOR 00000006
/dev/input/event1: EV_SYN SYN_REPORT 00000000
/dev/input/event1: EV_ABS ABS_MT_TRACKING_ID ffffffff
/dev/input/event1: EV_KEY BTN_TOUCH UP
/dev/input/event1: EV_KEY BTN_TOOL_FINGER UP
/dev/input/event1: EV_SYN SYN_REPORT 00000000
*/
// that's it. That's the struct
type InputEvent struct {
Time syscall.Timeval
Type EventType
Code EventCode
Value uint32
}
// Here are some constants I infered from the output above
type EventType uint16
const (
EV_ABS EventType = 0x0003
EV_KEY EventType = 0x0001
EV_SYN EventType = 0x0000
)
type EventCode uint16
const (
ABS_MT_TRACKING_ID EventCode = 0x0039
BTN_TOUCH EventCode = 0x014a
BTN_TOOL_FINGER EventCode = 0x0145
ABS_MT_POSITION_X EventCode = 0x0035
ABS_MT_POSITION_Y EventCode = 0x0036
ABS_MT_TOUCH_MAJOR EventCode = 0x0030
SYN_REPORT EventCode = 0x0000
)
const (
DOWN = 0x00000001
UP = 0x00000000
)
const (
PAUSE EventType = 0x3210
)
var (
eventSynReport = InputEvent{
Type: EV_SYN,
Code: SYN_REPORT,
Value: 0x00000000,
}
)
func runEvents(output io.Writer, events []InputEvent) (err error) {
for _, ievent := range events {
// The PAUSE event doesn't exist, I just chose the number
if ievent.Type == PAUSE {
time.Sleep(time.Duration(ievent.Value) * time.Millisecond)
continue
}
err = binary.Write(output, binary.LittleEndian, ievent)
if err != nil {
return err
}
}
return nil
}