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Log errors instead of failing in some cases #17

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Log errors instead of failing in some cases #17

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53 changes: 38 additions & 15 deletions device.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@ import (
"bytes"
"encoding/binary"
"fmt"
"log"
"os"
"path/filepath"
"strings"
Expand Down Expand Up @@ -42,12 +43,14 @@ func Open(devnode string) (*InputDevice, error) {
dev.Fn = devnode
dev.File = f

err = dev.set_device_info()
err = dev.setDeviceInfo()
if err != nil {
log.Printf("setDeviceInfo error: %v", err)
return nil, err
}
err = dev.set_device_capabilities()
err = dev.setDeviceCapabilities()
if err != nil {
log.Printf("setDeviceCapabilities error: %v", err)
return nil, err
}

Expand All @@ -61,12 +64,14 @@ func (dev *InputDevice) Read() ([]InputEvent, error) {

_, err := dev.File.Read(buffer)
if err != nil {
log.Printf("Read().dev.File.Read error: %v", err)
return events, err
}

b := bytes.NewBuffer(buffer)
err = binary.Read(b, binary.LittleEndian, &events)
if err != nil {
log.Printf("Read().binary.Read error: %v", err)
return events, err
}

Expand All @@ -88,12 +93,14 @@ func (dev *InputDevice) ReadOne() (*InputEvent, error) {

_, err := dev.File.Read(buffer)
if err != nil {
log.Printf("ReadOne().dev.File.Read error: %v", err)
return &event, err
}

b := bytes.NewBuffer(buffer)
err = binary.Read(b, binary.LittleEndian, &event)
if err != nil {
log.Printf("ReadOne().binary.Read error: %v", err)
return &event, err
}

Expand Down Expand Up @@ -125,7 +132,7 @@ func (dev *InputDevice) String() string {
}

// Gets the event types and event codes that the input device supports.
func (dev *InputDevice) set_device_capabilities() error {
func (dev *InputDevice) setDeviceCapabilities() error {
// Capabilities is a map of supported event types to lists of
// events e.g: {1: [272, 273, 274, 275], 2: [0, 1, 6, 8]}
// capabilities := make(map[int][]int)
Expand All @@ -137,6 +144,7 @@ func (dev *InputDevice) set_device_capabilities() error {

err := ioctl(dev.File.Fd(), uintptr(EVIOCGBIT(0, EV_MAX)), unsafe.Pointer(evbits))
if err != 0 {
log.Printf("setDeviceCapabilities().ioctl(EVIOCGBIT(0, EV_MAX)) error: %v", err)
return err
}

Expand All @@ -147,7 +155,9 @@ func (dev *InputDevice) set_device_capabilities() error {

err = ioctl(dev.File.Fd(), uintptr(EVIOCGBIT(evtype, KEY_MAX)), unsafe.Pointer(codebits))
if err != 0 {
return err
log.Printf("setDeviceCapabilities().ioctl(EVIOCGBIT(evtype, KEY_MAX)) evtype=%v error: %v", evtype, err)
//return err
continue
}
for evcode := 0; evcode < KEY_MAX; evcode++ {
if codebits[evcode/8]&(1<<uint(evcode%8)) != 0 {
Expand All @@ -167,39 +177,45 @@ func (dev *InputDevice) set_device_capabilities() error {
}

// An all-in-one function for describing an input device.
func (dev *InputDevice) set_device_info() error {
func (dev *InputDevice) setDeviceInfo() error {
info := device_info{}

name := new([MAX_NAME_SIZE]byte)
phys := new([MAX_NAME_SIZE]byte)

err := ioctl(dev.File.Fd(), uintptr(EVIOCGID), unsafe.Pointer(&info))
if err != 0 {
log.Printf("setDeviceInfo().ioctl(EVIOCGID) error: %v", err)
return err
}

err = ioctl(dev.File.Fd(), uintptr(EVIOCGNAME), unsafe.Pointer(name))
if err != 0 {
log.Printf("setDeviceInfo().ioctl(EVIOCGNAME) error: %v", err)
return err
}

// it's ok if the topology info is not available
ioctl(dev.File.Fd(), uintptr(EVIOCGPHYS), unsafe.Pointer(phys))
err = ioctl(dev.File.Fd(), uintptr(EVIOCGPHYS), unsafe.Pointer(phys))
if err != 0 {
log.Printf("setDeviceInfo().ioctl(EVIOCGPHYS) error: %v", err)
}

dev.Name = bytes_to_string(name)
dev.Phys = bytes_to_string(phys)
dev.Name = bytesToString(name)
dev.Phys = bytesToString(phys)

dev.Vendor = info.vendor
dev.Bustype = info.bustype
dev.Product = info.product
dev.Version = info.version

ev_version := new(int)
err = ioctl(dev.File.Fd(), uintptr(EVIOCGVERSION), unsafe.Pointer(ev_version))
evVersion := new(int)
err = ioctl(dev.File.Fd(), uintptr(EVIOCGVERSION), unsafe.Pointer(evVersion))
if err != 0 {
log.Printf("setDeviceInfo().ioctl(EVIOCGVERSION) error: %v", err)
return err
}
dev.EvdevVersion = *ev_version
dev.EvdevVersion = *evVersion

return nil
}
Expand All @@ -210,22 +226,28 @@ func (dev *InputDevice) set_device_info() error {
// to repeat (in milliseconds)
func (dev *InputDevice) GetRepeatRate() *[2]uint {
repeat_delay := new([2]uint)
ioctl(dev.File.Fd(), uintptr(EVIOCGREP), unsafe.Pointer(repeat_delay))

err := ioctl(dev.File.Fd(), uintptr(EVIOCGREP), unsafe.Pointer(repeat_delay))
if err != 0 {
log.Printf("GetRepeatRate().ioctl error: %v", err)
}
return repeat_delay
}

// Set repeat rate and delay.
func (dev *InputDevice) SetRepeatRate(repeat, delay uint) {
repeat_delay := new([2]uint)
repeat_delay[0], repeat_delay[1] = repeat, delay
ioctl(dev.File.Fd(), uintptr(EVIOCSREP), unsafe.Pointer(repeat_delay))
err := ioctl(dev.File.Fd(), uintptr(EVIOCSREP), unsafe.Pointer(repeat_delay))
if err != 0 {
log.Printf("SetRepeatRate().ioctl error: %v", err)
}
}

// Grab the input device exclusively.
func (dev *InputDevice) Grab() error {
grab := int(1)
if err := ioctl(dev.File.Fd(), uintptr(EVIOCGRAB), unsafe.Pointer(&grab)); err != 0 {
log.Printf("Grab().ioctl error: %v", err)
return err
}

Expand All @@ -235,6 +257,7 @@ func (dev *InputDevice) Grab() error {
// Release a grabbed input device.
func (dev *InputDevice) Release() error {
if err := ioctl(dev.File.Fd(), uintptr(EVIOCGRAB), unsafe.Pointer(nil)); err != 0 {
log.Printf("Release().ioctl error: %v", err)
return err
}

Expand Down Expand Up @@ -332,7 +355,7 @@ func ListInputDevices(device_glob_arg ...string) ([]*InputDevice, error) {
return devices, nil
}

func bytes_to_string(b *[MAX_NAME_SIZE]byte) string {
func bytesToString(b *[MAX_NAME_SIZE]byte) string {
idx := bytes.IndexByte(b[:], 0)
return string(b[:idx])
}