support PL2303GC/GB/GT/GL/GE/GS

see https://lore.kernel.org/linux-usb/20190213123000.4656-1-charlesyeh522@gmail.com/

usbSerialExamples/src/main/res/xml/device_filter.xml

@@ -12,8 +12,14 @@
     <usb-device vendor-id="4292" product-id="60016" /> <!-- 0xea70: CP2105 -->
     <usb-device vendor-id="4292" product-id="60017" /> <!-- 0xea71: CP2108 -->
 
-    <!-- 0x067B / 0x2303: Prolific PL2303 -->
+    <!-- 0x067B / 0x23?3: Prolific PL2303x -->
-    <usb-device vendor-id="1659" product-id="8963" />
+    <usb-device vendor-id="1659" product-id="8963" /> <!-- 0x2303: PL2303HX, HXD, TA, ... -->
+    <usb-device vendor-id="1659" product-id="9123" /> <!-- 0x23a3: PL2303GC -->
+    <usb-device vendor-id="1659" product-id="9139" /> <!-- 0x23b3: PL2303GB -->
+    <usb-device vendor-id="1659" product-id="9155" /> <!-- 0x23c3: PL2303GT -->
+    <usb-device vendor-id="1659" product-id="9171" /> <!-- 0x23d3: PL2303GL -->
+    <usb-device vendor-id="1659" product-id="9187" /> <!-- 0x23e3: PL2303GE -->
+    <usb-device vendor-id="1659" product-id="9203" /> <!-- 0x23f3: PL2303GS -->
 
     <!-- 0x1a86 / 0x?523: Qinheng CH34x -->
     <usb-device vendor-id="6790" product-id="21795" /> <!-- 0x5523: CH341A -->

usbSerialForAndroid/src/androidTest/java/com/hoho/android/usbserial/DeviceTest.java

@@ -323,6 +323,7 @@ public class DeviceTest {
                 403200, 460800, 614400, 806400, 921600, 1228800, 2457600, 3000000, /*6000000*/
         };
         usb.open();
+        Assume.assumeFalse("only for non PL2303G*", ProlificWrapper.isDeviceTypeHxn(usb.serialPort)); // HXN does not use divisor
 
         int minBaudRate = ProlificWrapper.isDeviceTypeT(usb.serialPort) ? 6 : 46;
         try {
@@ -1675,7 +1676,7 @@ public class DeviceTest {
 
     @Test
     /* test not done by RFC2217 server. Instead output control lines are connected to
-         input control lines with a binary decoder 74LS138, 74LS139, 74HC... or ...
+         input control lines with a binary decoder 74LS42, 74LS138, 74LS139, 74HC... or ...
         in
             A0 = RTS
             A1 = DTR

usbSerialForAndroid/src/androidTest/java/com/hoho/android/usbserial/driver/ProlificWrapper.java

@@ -5,4 +5,9 @@ public class ProlificWrapper {
         ProlificSerialDriver.ProlificSerialPort prolificSerialPort = (ProlificSerialDriver.ProlificSerialPort) serialPort;
         return prolificSerialPort.mDeviceType == ProlificSerialDriver.DeviceType.DEVICE_TYPE_T;
     }
+
+    public static boolean isDeviceTypeHxn(UsbSerialPort serialPort) {
+        ProlificSerialDriver.ProlificSerialPort prolificSerialPort = (ProlificSerialDriver.ProlificSerialPort) serialPort;
+        return prolificSerialPort.mDeviceType == ProlificSerialDriver.DeviceType.DEVICE_TYPE_HXN;
+    }
 }

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/ProlificSerialDriver.java

@@ -35,7 +35,7 @@ public class ProlificSerialDriver implements UsbSerialDriver {
             28800, 38400, 57600, 115200, 128000, 134400, 161280, 201600, 230400, 268800,
             403200, 460800, 614400, 806400, 921600, 1228800, 2457600, 3000000, 6000000
     };
-    protected enum DeviceType { DEVICE_TYPE_01, DEVICE_TYPE_T, DEVICE_TYPE_HX}
+    protected enum DeviceType { DEVICE_TYPE_01, DEVICE_TYPE_T, DEVICE_TYPE_HX, DEVICE_TYPE_HXN}
 
     private final UsbDevice mDevice;
     private final UsbSerialPort mPort;
@@ -62,34 +62,50 @@ public class ProlificSerialDriver implements UsbSerialDriver {
 
         private static final int USB_RECIP_INTERFACE = 0x01;
 
-        private static final int PROLIFIC_VENDOR_READ_REQUEST = 0x01;
+        private static final int VENDOR_READ_REQUEST = 0x01;
-        private static final int PROLIFIC_VENDOR_WRITE_REQUEST = 0x01;
+        private static final int VENDOR_WRITE_REQUEST = 0x01;
+        private static final int VENDOR_READ_HXN_REQUEST = 0x81;
+        private static final int VENDOR_WRITE_HXN_REQUEST = 0x80;
 
-        private static final int PROLIFIC_VENDOR_OUT_REQTYPE = UsbConstants.USB_DIR_OUT | UsbConstants.USB_TYPE_VENDOR;
+        private static final int VENDOR_OUT_REQTYPE = UsbConstants.USB_DIR_OUT | UsbConstants.USB_TYPE_VENDOR;
-        private static final int PROLIFIC_VENDOR_IN_REQTYPE = UsbConstants.USB_DIR_IN | UsbConstants.USB_TYPE_VENDOR;
+        private static final int VENDOR_IN_REQTYPE = UsbConstants.USB_DIR_IN | UsbConstants.USB_TYPE_VENDOR;
-        private static final int PROLIFIC_CTRL_OUT_REQTYPE = UsbConstants.USB_DIR_OUT | UsbConstants.USB_TYPE_CLASS | USB_RECIP_INTERFACE;
+        private static final int CTRL_OUT_REQTYPE = UsbConstants.USB_DIR_OUT | UsbConstants.USB_TYPE_CLASS | USB_RECIP_INTERFACE;
 
         private static final int WRITE_ENDPOINT = 0x02;
         private static final int READ_ENDPOINT = 0x83;
         private static final int INTERRUPT_ENDPOINT = 0x81;
 
-        private static final int FLUSH_RX_REQUEST = 0x08; // RX @ Prolific device = write @ usb-serial-for-android library
+        private static final int RESET_HXN_REQUEST = 0x07;
+        private static final int FLUSH_RX_REQUEST = 0x08;
         private static final int FLUSH_TX_REQUEST = 0x09;
-
         private static final int SET_LINE_REQUEST = 0x20; // same as CDC SET_LINE_CODING
         private static final int SET_CONTROL_REQUEST = 0x22; // same as CDC SET_CONTROL_LINE_STATE
         private static final int SEND_BREAK_REQUEST = 0x23; // same as CDC SEND_BREAK
+        private static final int GET_CONTROL_HXN_REQUEST = 0x80;
         private static final int GET_CONTROL_REQUEST = 0x87;
         private static final int STATUS_NOTIFICATION = 0xa1; // similar to CDC SERIAL_STATE but different length
 
+        /* RESET_HXN_REQUEST */
+        private static final int RESET_HXN_RX_PIPE = 1;
+        private static final int RESET_HXN_TX_PIPE = 2;
+
+        /* SET_CONTROL_REQUEST */
         private static final int CONTROL_DTR = 0x01;
         private static final int CONTROL_RTS = 0x02;
 
+        /* GET_CONTROL_REQUEST */
         private static final int GET_CONTROL_FLAG_CD = 0x02;
         private static final int GET_CONTROL_FLAG_DSR = 0x04;
         private static final int GET_CONTROL_FLAG_RI = 0x01;
         private static final int GET_CONTROL_FLAG_CTS = 0x08;
 
+        /* GET_CONTROL_HXN_REQUEST */
+        private static final int GET_CONTROL_HXN_FLAG_CD = 0x40;
+        private static final int GET_CONTROL_HXN_FLAG_DSR = 0x20;
+        private static final int GET_CONTROL_HXN_FLAG_RI = 0x80;
+        private static final int GET_CONTROL_HXN_FLAG_CTS = 0x08;
+
+        /* interrupt endpoint read */
         private static final int STATUS_FLAG_CD = 0x01;
         private static final int STATUS_FLAG_DSR = 0x02;
         private static final int STATUS_FLAG_RI = 0x08;
@@ -137,11 +153,13 @@ public class ProlificSerialDriver implements UsbSerialDriver {
         }
 
         private byte[] vendorIn(int value, int index, int length) throws IOException {
-            return inControlTransfer(PROLIFIC_VENDOR_IN_REQTYPE, PROLIFIC_VENDOR_READ_REQUEST, value, index, length);
+            int request = (mDeviceType == DeviceType.DEVICE_TYPE_HXN) ? VENDOR_READ_HXN_REQUEST : VENDOR_READ_REQUEST;
+            return inControlTransfer(VENDOR_IN_REQTYPE, request, value, index, length);
         }
 
         private void vendorOut(int value, int index, byte[] data) throws IOException {
-            outControlTransfer(PROLIFIC_VENDOR_OUT_REQTYPE, PROLIFIC_VENDOR_WRITE_REQUEST, value, index, data);
+            int request = (mDeviceType == DeviceType.DEVICE_TYPE_HXN) ? VENDOR_WRITE_HXN_REQUEST : VENDOR_WRITE_REQUEST;
+            outControlTransfer(VENDOR_OUT_REQTYPE, request, value, index, data);
         }
 
         private void resetDevice() throws IOException {
@@ -149,10 +167,21 @@ public class ProlificSerialDriver implements UsbSerialDriver {
         }
 
         private void ctrlOut(int request, int value, int index, byte[] data) throws IOException {
-            outControlTransfer(PROLIFIC_CTRL_OUT_REQTYPE, request, value, index, data);
+            outControlTransfer(CTRL_OUT_REQTYPE, request, value, index, data);
+        }
+
+        private boolean testHxStatus() {
+            try {
+                inControlTransfer(VENDOR_IN_REQTYPE, VENDOR_READ_REQUEST, 0x8080, 0, 1);
+                return true;
+            } catch(IOException ignored) {
+                return false;
+            }
         }
 
         private void doBlackMagic() throws IOException {
+            if (mDeviceType == DeviceType.DEVICE_TYPE_HXN)
+                return;
             vendorIn(0x8484, 0, 1);
             vendorOut(0x0404, 0, null);
             vendorIn(0x8484, 0, 1);
@@ -199,12 +228,20 @@ public class ProlificSerialDriver implements UsbSerialDriver {
             if ((mReadStatusThread == null) && (mReadStatusException == null)) {
                 synchronized (mReadStatusThreadLock) {
                     if (mReadStatusThread == null) {
-                        byte[] data = vendorIn(GET_CONTROL_REQUEST, 0, 1);
                         mStatus = 0;
-                        if((data[0] & GET_CONTROL_FLAG_CTS) == 0) mStatus |= STATUS_FLAG_CTS;
+                        if(mDeviceType == DeviceType.DEVICE_TYPE_HXN) {
-                        if((data[0] & GET_CONTROL_FLAG_DSR) == 0) mStatus |= STATUS_FLAG_DSR;
+                            byte[] data = vendorIn(GET_CONTROL_HXN_REQUEST, 0, 1);
-                        if((data[0] & GET_CONTROL_FLAG_CD) == 0) mStatus |= STATUS_FLAG_CD;
+                            if ((data[0] & GET_CONTROL_HXN_FLAG_CTS) == 0) mStatus |= STATUS_FLAG_CTS;
-                        if((data[0] & GET_CONTROL_FLAG_RI) == 0) mStatus |= STATUS_FLAG_RI;
+                            if ((data[0] & GET_CONTROL_HXN_FLAG_DSR) == 0) mStatus |= STATUS_FLAG_DSR;
+                            if ((data[0] & GET_CONTROL_HXN_FLAG_CD) == 0) mStatus |= STATUS_FLAG_CD;
+                            if ((data[0] & GET_CONTROL_HXN_FLAG_RI) == 0) mStatus |= STATUS_FLAG_RI;
+                        } else {
+                            byte[] data = vendorIn(GET_CONTROL_REQUEST, 0, 1);
+                            if ((data[0] & GET_CONTROL_FLAG_CTS) == 0) mStatus |= STATUS_FLAG_CTS;
+                            if ((data[0] & GET_CONTROL_FLAG_DSR) == 0) mStatus |= STATUS_FLAG_DSR;
+                            if ((data[0] & GET_CONTROL_FLAG_CD) == 0) mStatus |= STATUS_FLAG_CD;
+                            if ((data[0] & GET_CONTROL_FLAG_RI) == 0) mStatus |= STATUS_FLAG_RI;
+                        }
                         //Log.d(TAG, "start control line status thread " + mStatus);
                         mReadStatusThread = new Thread(this::readStatusThreadFunction);
                         mReadStatusThread.setDaemon(true);
@@ -266,12 +303,14 @@ public class ProlificSerialDriver implements UsbSerialDriver {
                 mDeviceType = DeviceType.DEVICE_TYPE_T; // TA
             } else if(deviceVersion == 0x500) {
                 mDeviceType = DeviceType.DEVICE_TYPE_T; // TB
+            } else if(usbVersion == 0x200 && !testHxStatus()) {
+                mDeviceType = DeviceType.DEVICE_TYPE_HXN;
             } else {
                 mDeviceType = DeviceType.DEVICE_TYPE_HX;
             }
-            setControlLines(mControlLinesValue);
             resetDevice();
             doBlackMagic();
+            setControlLines(mControlLinesValue);
         }
 
         @Override
@@ -304,6 +343,9 @@ public class ProlificSerialDriver implements UsbSerialDriver {
             if (baudRate <= 0) {
                 throw new IllegalArgumentException("Invalid baud rate: " + baudRate);
             }
+            if (mDeviceType == DeviceType.DEVICE_TYPE_HXN) {
+                return baudRate;
+            }
             for(int br : standardBaudRates) {
                 if (br == baudRate) {
                     return baudRate;
@@ -501,12 +543,17 @@ public class ProlificSerialDriver implements UsbSerialDriver {
 
         @Override
         public void purgeHwBuffers(boolean purgeWriteBuffers, boolean purgeReadBuffers) throws IOException {
-            if (purgeWriteBuffers) {
+            if (mDeviceType == DeviceType.DEVICE_TYPE_HXN) {
-                vendorOut(FLUSH_RX_REQUEST, 0, null);
+                int index = 0;
-            }
+                if(purgeWriteBuffers) index |= RESET_HXN_RX_PIPE;
-
+                if(purgeReadBuffers) index |= RESET_HXN_TX_PIPE;
-            if (purgeReadBuffers) {
+                if(index != 0)
-                vendorOut(FLUSH_TX_REQUEST, 0, null);
+                    vendorOut(RESET_HXN_REQUEST, index, null);
+            } else {
+                if (purgeWriteBuffers)
+                    vendorOut(FLUSH_RX_REQUEST, 0, null);
+                if (purgeReadBuffers)
+                    vendorOut(FLUSH_TX_REQUEST, 0, null);
             }
         }
 
@@ -519,7 +566,15 @@ public class ProlificSerialDriver implements UsbSerialDriver {
     public static Map<Integer, int[]> getSupportedDevices() {
         final Map<Integer, int[]> supportedDevices = new LinkedHashMap<>();
         supportedDevices.put(UsbId.VENDOR_PROLIFIC,
-                new int[] { UsbId.PROLIFIC_PL2303, });
+                new int[] {
+                        UsbId.PROLIFIC_PL2303,
+                        UsbId.PROLIFIC_PL2303GC,
+                        UsbId.PROLIFIC_PL2303GB,
+                        UsbId.PROLIFIC_PL2303GT,
+                        UsbId.PROLIFIC_PL2303GL,
+                        UsbId.PROLIFIC_PL2303GE,
+                        UsbId.PROLIFIC_PL2303GS,
+                });
         return supportedDevices;
     }
 }

usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/UsbId.java

@@ -50,7 +50,13 @@ public final class UsbId {
     public static final int SILABS_CP2108 = 0xea71;
 
     public static final int VENDOR_PROLIFIC = 0x067b;
-    public static final int PROLIFIC_PL2303 = 0x2303;
+    public static final int PROLIFIC_PL2303 = 0x2303;   // device type 01, T, HX
+    public static final int PROLIFIC_PL2303GC = 0x23a3; // device type HXN
+    public static final int PROLIFIC_PL2303GB = 0x23b3; // "
+    public static final int PROLIFIC_PL2303GT = 0x23cd; // "
+    public static final int PROLIFIC_PL2303GL = 0x23e3; // "
+    public static final int PROLIFIC_PL2303GE = 0x23e3; // "
+    public static final int PROLIFIC_PL2303GS = 0x23f3; // "
 
     public static final int VENDOR_QINHENG = 0x1a86;
     public static final int QINHENG_CH340 = 0x7523;