110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
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//
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// Copyright 2014-2023 Cristian Maglie. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//
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package enumerator
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import (
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"bufio"
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"fmt"
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"os"
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"path/filepath"
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"go.bug.st/serial"
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)
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func nativeGetDetailedPortsList() ([]*PortDetails, error) {
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// Retrieve the port list
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ports, err := serial.GetPortsList()
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if err != nil {
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return nil, &PortEnumerationError{causedBy: err}
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}
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var res []*PortDetails
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for _, port := range ports {
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details, err := nativeGetPortDetails(port)
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if err != nil {
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return nil, &PortEnumerationError{causedBy: err}
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}
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res = append(res, details)
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}
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return res, nil
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}
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func nativeGetPortDetails(portPath string) (*PortDetails, error) {
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portName := filepath.Base(portPath)
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devicePath := fmt.Sprintf("/sys/class/tty/%s/device", portName)
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if _, err := os.Stat(devicePath); err != nil {
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return &PortDetails{}, nil
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}
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realDevicePath, err := filepath.EvalSymlinks(devicePath)
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if err != nil {
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return nil, fmt.Errorf("Can't determine real path of %s: %s", devicePath, err.Error())
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}
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subSystemPath, err := filepath.EvalSymlinks(filepath.Join(realDevicePath, "subsystem"))
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if err != nil {
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return nil, fmt.Errorf("Can't determine real path of %s: %s", filepath.Join(realDevicePath, "subsystem"), err.Error())
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}
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subSystem := filepath.Base(subSystemPath)
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result := &PortDetails{Name: portPath}
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switch subSystem {
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case "usb-serial":
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err := parseUSBSysFS(filepath.Dir(filepath.Dir(realDevicePath)), result)
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return result, err
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case "usb":
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err := parseUSBSysFS(filepath.Dir(realDevicePath), result)
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return result, err
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// TODO: other cases?
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default:
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return result, nil
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}
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}
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func parseUSBSysFS(usbDevicePath string, details *PortDetails) error {
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vid, err := readLine(filepath.Join(usbDevicePath, "idVendor"))
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if err != nil {
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return err
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}
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pid, err := readLine(filepath.Join(usbDevicePath, "idProduct"))
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if err != nil {
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return err
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}
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serial, err := readLine(filepath.Join(usbDevicePath, "serial"))
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if err != nil {
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return err
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}
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//manufacturer, err := readLine(filepath.Join(usbDevicePath, "manufacturer"))
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//if err != nil {
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// return err
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//}
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//product, err := readLine(filepath.Join(usbDevicePath, "product"))
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//if err != nil {
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// return err
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//}
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details.IsUSB = true
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details.VID = vid
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details.PID = pid
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details.SerialNumber = serial
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//details.Manufacturer = manufacturer
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//details.Product = product
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return nil
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}
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func readLine(filename string) (string, error) {
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file, err := os.Open(filename)
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if os.IsNotExist(err) {
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return "", nil
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}
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if err != nil {
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return "", err
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}
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defer file.Close()
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reader := bufio.NewReader(file)
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line, _, err := reader.ReadLine()
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return string(line), err
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}
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