Refactor USB vendor/product to product string to UsbUtil.h.

Also implement reading of /var/lib/usbutils/usb.ids for systems that have it (e.g. desktop Linux).
2026-06-23 01:21:42 +00:00 · 2016-12-21 00:14:55 -08:00
parent 88afefe464
commit 10b13da3da
3 changed files with 182 additions and 40 deletions
--- a/src/UsbUtil.cpp
+++ b/src/UsbUtil.cpp
@@ -0,0 +1,108 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2016. All Rights Reserved.                             */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include "UsbUtil.h"
+
+#include <fcntl.h>
+
+#include "llvm/Format.h"
+#include "llvm/SmallString.h"
+#include "llvm/raw_ostream.h"
+#include "support/raw_istream.h"
+
+#include "HttpUtil.h"
+
+namespace cs {
+
+static llvm::StringRef GetUsbNameFromFile(int vendor, int product,
+                                          llvm::SmallVectorImpl<char>& buf) {
+  int fd = open("/var/lib/usbutils/usb.ids", O_RDONLY);
+  if (fd < 0) return llvm::StringRef{};
+
+  llvm::raw_svector_ostream os{buf};
+  wpi::raw_fd_istream is{fd, true};
+
+  // build vendor and product 4-char hex strings
+  llvm::SmallString<16> vendorStr, productStr;
+  llvm::raw_svector_ostream vendorOs{vendorStr}, productOs{productStr};
+  vendorOs << llvm::format_hex_no_prefix(vendor, 4);
+  productOs << llvm::format_hex_no_prefix(product, 4);
+
+  // scan file
+  llvm::SmallString<128> lineBuf;
+  bool foundVendor = false;
+  for (;;) {
+    bool error = false;
+    auto line = ReadLine(is, lineBuf, 4096, &error);
+    if (error) break;
+
+    if (line.empty()) continue;
+
+    // look for vendor at start of line
+    if (line.startswith(vendorStr)) {
+      foundVendor = true;
+      os << line.substr(5).trim() << ' ';
+      continue;
+    }
+
+    if (foundVendor) {
+      // next vendor, but didn't match product?
+      if (line[0] != '\t') {
+        os << "Unknown";
+        return os.str();
+      }
+
+      // look for product
+      if (line.substr(1).startswith(productStr)) {
+        os << line.substr(6).trim();
+        return os.str();
+      }
+    }
+  }
+
+  return llvm::StringRef{};
+}
+
+llvm::StringRef GetUsbNameFromId(int vendor, int product,
+                                 llvm::SmallVectorImpl<char>& buf) {
+  // try reading usb.ids
+  llvm::StringRef rv = GetUsbNameFromFile(vendor, product, buf);
+  if (!rv.empty()) return rv;
+
+  // Fall back to internal database
+  llvm::raw_svector_ostream os{buf};
+  switch (vendor) {
+    case 0x046d:
+      os << "Logitech, Inc. ";
+      switch (product) {
+        case 0x0802: os << "Webcam C200"; break;
+        case 0x0804: os << "Webcam C250"; break;
+        case 0x0805: os << "Webcam C300"; break;
+        case 0x0807: os << "Webcam B500"; break;
+        case 0x0808: os << "Webcam C600"; break;
+        case 0x0809: os << "Webcam Pro 9000"; break;
+        case 0x080a: os << "Portable Webcam C905"; break;
+        case 0x080f: os << "Webcam C120"; break;
+        case 0x0819: os << "Webcam C210"; break;
+        case 0x081b: os << "Webcam C310"; break;
+        case 0x081d: os << "HD Webcam C510"; break;
+        case 0x0821: os << "HD Webcam C910"; break;
+        case 0x0825: os << "Webcam C270"; break;
+        case 0x0826: os << "HD Webcam C525"; break;
+        case 0x0828: os << "HD Webcam B990"; break;
+        case 0x082b: os << "Webcam C170"; break;
+        case 0x082d: os << "HD Pro Webcam C920"; break;
+        case 0x0836: os << "B525 HD Webcam"; break;
+        case 0x0843: os << "Webcam C930e"; break;
+      }
+      break;
+  }
+
+  return os.str();
+}
+
+}  // namespace cs