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ports.go
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ports.go
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// Copyright (C) 2022 - Tillitis AB
// SPDX-License-Identifier: GPL-2.0-only
package util
import (
"fmt"
"os"
"go.bug.st/serial/enumerator"
)
type constError string
func (err constError) Error() string {
return string(err)
}
const (
tillitisUSBVID = "1207"
tillitisUSBPID = "8887"
// Custom errors
ErrNoDevice = constError("no TKey connected")
ErrManyDevices = constError("more than one TKey connected")
)
type SerialPort struct {
DevPath string
SerialNumber string
}
func DetectSerialPort(verbose bool) (string, error) {
ports, err := GetSerialPorts()
if err != nil {
return "", err
}
if len(ports) == 0 {
if verbose {
fmt.Fprintf(os.Stderr, "No TKey serial ports detected. You may specify a known device path using --port.\n")
}
return "", ErrNoDevice
}
if len(ports) > 1 {
if verbose {
fmt.Fprintf(os.Stderr, "Detected %d TKey serial ports:\n", len(ports))
for _, p := range ports {
fmt.Fprintf(os.Stderr, "%s with serial number %s\n", p.DevPath, p.SerialNumber)
}
fmt.Fprintf(os.Stderr, "Please choose one of the above by using the --port flag.\n")
}
return "", ErrManyDevices
}
if verbose {
fmt.Fprintf(os.Stderr, "Auto-detected serial port %s\n", ports[0].DevPath)
}
return ports[0].DevPath, nil
}
func GetSerialPorts() ([]SerialPort, error) {
var ports []SerialPort
portDetails, err := enumerator.GetDetailedPortsList()
if err != nil {
return nil, fmt.Errorf("GetDetailedPortsList: %w", err)
}
if len(portDetails) == 0 {
return ports, nil
}
for _, port := range portDetails {
if port.IsUSB && port.VID == tillitisUSBVID && port.PID == tillitisUSBPID {
ports = append(ports, SerialPort{port.Name, port.SerialNumber})
}
}
return ports, nil
}