Add USB version 2.1

Author: surban

src/bin/usb-gadget/build.rs

@@ -438,6 +438,7 @@ fn parse_usb_version(s: &str) -> Result<UsbVersion> {
     match s {
         "1.1" => Ok(UsbVersion::V11),
         "2.0" => Ok(UsbVersion::V20),
+        "2.1" => Ok(UsbVersion::V21),
         "3.0" => Ok(UsbVersion::V30),
         "3.1" => Ok(UsbVersion::V31),
         _ => {

src/gadget.rs

@@ -248,6 +248,8 @@ pub enum UsbVersion {
     /// USB 2.0
     #[default]
     V20,
+    /// USB 2.0 with BOS descriptor support (bcdUSB 0x0201), needed for WinUSB.
+    V21,
     /// USB 3.0
     V30,
     /// USB 3.1
@@ -261,6 +263,7 @@ impl From<UsbVersion> for u16 {
         match value {
             UsbVersion::V11 => 0x0110,
             UsbVersion::V20 => 0x0200,
+            UsbVersion::V21 => 0x0201,
             UsbVersion::V30 => 0x0300,
             UsbVersion::V31 => 0x0310,
             UsbVersion::Other(ver) => ver,