Add proper reset handling to the USB Printer Device Class driver.

LUFA/Drivers/USB/Class/Device/PrinterClassDevice.c

@@ -59,7 +59,7 @@ void PRNT_Device_ProcessControlRequest(USB_ClassInfo_PRNT_Device_t* const PRNTIn
 				}
 
 				uint16_t IEEEStringLen = strlen(PRNTInterfaceInfo->Config.IEEE1284String);
-				Endpoint_Write_16_BE(IEEEStringLen + 1);
+				Endpoint_Write_16_BE(IEEEStringLen);
 				Endpoint_Write_Control_Stream_LE(PRNTInterfaceInfo->Config.IEEE1284String, IEEEStringLen);
 				Endpoint_ClearStatusStage();
 			}
@@ -87,6 +87,8 @@ void PRNT_Device_ProcessControlRequest(USB_ClassInfo_PRNT_Device_t* const PRNTIn
 				Endpoint_ClearSETUP();
 				Endpoint_ClearStatusStage();
 
+				PRNTInterfaceInfo->State.IsPrinterReset = true;
+
 				EVENT_PRNT_Device_SoftReset(PRNTInterfaceInfo);
 			}
 
@@ -122,6 +124,21 @@ void PRNT_Device_USBTask(USB_ClassInfo_PRNT_Device_t* const PRNTInterfaceInfo)
 	if (Endpoint_IsINReady())
 	  PRNT_Device_Flush(PRNTInterfaceInfo);
 	#endif
+
+	if (PRNTInterfaceInfo->State.IsPrinterReset)
+	{
+		Endpoint_ResetEndpoint(PRNTInterfaceInfo->Config.DataOUTEndpoint.Address);
+		Endpoint_ResetEndpoint(PRNTInterfaceInfo->Config.DataINEndpoint.Address);
+
+		Endpoint_SelectEndpoint(PRNTInterfaceInfo->Config.DataOUTEndpoint.Address);
+		Endpoint_ClearStall();
+		Endpoint_ResetDataToggle();
+		Endpoint_SelectEndpoint(PRNTInterfaceInfo->Config.DataINEndpoint.Address);
+		Endpoint_ClearStall();
+		Endpoint_ResetDataToggle();
+
+		PRNTInterfaceInfo->State.IsPrinterReset = false;
+	}
 }
 
 uint8_t PRNT_Device_SendString(USB_ClassInfo_PRNT_Device_t* const PRNTInterfaceInfo,

LUFA/Drivers/USB/Class/Device/PrinterClassDevice.h

@@ -87,14 +87,20 @@
 					USB_Endpoint_Table_t DataOUTEndpoint; /**< Data OUT endpoint configuration table. */
 
 					char* IEEE1284String; /**< IEEE 1284 identification string, sent to the host during enumeration
-					                       *   to identify the printer model, manufacturer and other characteristics. */
+					                       *   to identify the printer model, manufacturer and other characteristics.
+					                       */
 				} Config; /**< Config data for the USB class interface within the device. All elements in this section
 				           *   <b>must</b> be set or the interface will fail to enumerate and operate correctly.
 				           */
 				struct
 				{
 					uint8_t PortStatus; /**< Current status of the Printer virtual port, a collection of \c PRNT_PORTSTATUS_*
-					                     *   bitmask values. */
+					                     *   bitmask values.
+					                     */
+
+					volatile bool IsPrinterReset; /**< Flag indicating that the host has requested that the Printer interface be reset
+											       *   and that all current Mass Storage operations should immediately abort.
+											       */
 				} State; /**< State data for the USB class interface within the device. All elements in this section
 				          *   are reset to their defaults when the interface is enumerated.
 				          */
@@ -131,7 +137,7 @@
 			 *
 			 *  \param[in,out] PRNTInterfaceInfo  Pointer to a structure containing a Printer Class configuration and state.
 			 */
-			void EVENT_PRNT_Device_SoftReset(USB_ClassInfo_CDC_Device_t* const CDCInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
+			void EVENT_PRNT_Device_SoftReset(USB_ClassInfo_PRNT_Device_t* const PRNTInterfaceInfo) ATTR_NON_NULL_PTR_ARG(1);
 
 			/** Sends a given data buffer to the attached USB host, if connected. If a host is not connected when the function is
 			 *  called, the string is discarded. Bytes will be queued for transmission to the host until either the endpoint bank