usb_mode: support BMC as USB-host

API is extended with usb mode = 3; BMC as USB-host

bmcd/src/legacy.rs

@@ -320,14 +320,17 @@ async fn set_usb_mode(bmc: &BmcApplication, query: Query) -> LegacyResult<()> {
     let mode_num = i32::from_str(mode_str)
         .map_err(|_| LegacyResponse::bad_request("Parameter `mode` is not a number"))?;
 
-    let mode = mode_num
+    let mode = (mode_num & 0x3)
         .try_into()
         .map_err(|_| LegacyResponse::bad_request("Parameter `mode` can be either 0 or 1"))?;
 
-    bmc.usb_boot(node, true).await?;
+    let route = (mode_num & 0x4)
+        .try_into()
+        .expect("conversion of single bit cannot fail");
+
     let cfg = match mode {
         UsbMode::Device => UsbConfig::UsbA(node),
-        UsbMode::Host => UsbConfig::Node(node, UsbRoute::UsbA),
+        UsbMode::Host => UsbConfig::Node(node, route),
     };
 
     bmc.configure_usb(cfg)