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main.go
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main.go
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package main
import (
"encoding/binary"
"log"
"os"
)
var (
senable = []byte("a")
sdisable = []byte("d")
)
func main() {
// TODO: command line flag
masterPath := "/dev/input/event0"
slavePath := "/sys/bus/i2c/devices/0-0050/neocmd"
var master, slave *os.File
var err error
if master, err = os.Open(masterPath); err != nil {
log.Fatal("open ", masterPath, err)
}
slaveState := true
evb := make([]byte, 16)
for {
n, err := master.Read(evb)
if err != nil {
log.Print("master.Read: ", err)
continue
}
if n != 16 {
log.Printf("master.Read invalid event size=%d, ignore", n)
continue
}
evType := binary.LittleEndian.Uint16(evb[8:])
evCode := binary.LittleEndian.Uint16(evb[10:])
evValue := binary.LittleEndian.Uint32(evb[12:])
log.Printf("event type=%d code=%d value=%d", evType, evCode, evValue)
if evType == 1 && evCode == 116 && evValue == 1 {
sb := senable
slaveState = !slaveState
if !slaveState {
sb = sdisable
}
log.Printf("power key pressed, new slavestate=%v writing=%s", slaveState, string(sb))
if slave, err = os.OpenFile(slavePath, os.O_WRONLY|os.O_TRUNC, 0644); err != nil {
log.Fatal("open ", slavePath, err)
}
if _, err = slave.WriteAt(sb, 0); err != nil {
log.Fatal("slave.Write ", err)
}
if err = slave.Close(); err != nil {
log.Fatal("slave.Close ", err)
}
}
}
}