Add serial connection Flow control for Intel's UartSub devices in Windows

cmdline.c

@@ -554,6 +554,9 @@ int cmdline_process_param(const char *p, char *value,
 		  case 'D':
 		    conf_set_int(conf, CONF_serflow, SER_FLOW_DSRDTR);
 		    break;
+		  case 'U':
+		    conf_set_int(conf, CONF_serflow, SER_FLOW_NONE_DTR_RTS_DIS);
+		    break;
 
 		  default:
 		    cmdline_error("Unrecognised suboption \"-sercfg %c\"",

doc/using.but

@@ -980,8 +980,8 @@ follows:
 \cq{o} for odd, \cq{e} for even, \cq{m} for mark and \cq{s} for space.
 
 \b A single upper-case letter specifies the flow control: \cq{N} for
-none, \cq{X} for XON/XOFF, \cq{R} for RTS/CTS and \cq{D} for
-DSR/DTR.
+none, \cq{X} for XON/XOFF, \cq{R} for RTS/CTS, \cq{D} for
+DSR/DTR and \cq{U} Disables DTR/RTS (only in Windows version).
 
 For example, \cq{-sercfg 19200,8,n,1,N} denotes a baud rate of
 19200, 8 data bits, no parity, 1 stop bit and no flow control.

putty.h

@@ -368,7 +368,7 @@ enum {
 };
 
 enum {
-    SER_FLOW_NONE, SER_FLOW_XONXOFF, SER_FLOW_RTSCTS, SER_FLOW_DSRDTR
+    SER_FLOW_NONE, SER_FLOW_XONXOFF, SER_FLOW_RTSCTS, SER_FLOW_DSRDTR, SER_FLOW_NONE_DTR_RTS_DIS
 };
 
 /*

sercfg.c

@@ -82,6 +82,7 @@ static void serial_flow_handler(union control *ctrl, void *dlg,
 	{"XON/XOFF", SER_FLOW_XONXOFF},
 	{"RTS/CTS", SER_FLOW_RTSCTS},
 	{"DSR/DTR", SER_FLOW_DSRDTR},
+	{"Disable DTR/RTS", SER_FLOW_NONE_DTR_RTS_DIS},
     };
     int mask = ctrl->listbox.context.i;
     int i, j;

windows/wincfg.c

@@ -387,7 +387,7 @@ void win_setup_config_box(struct controlbox *b, HWND *hwndp, int has_help,
      * Serial back end is available on Windows.
      */
     if (!midsession || (protocol == PROT_SERIAL))
-        ser_setup_config_box(b, midsession, 0x1F, 0x0F);
+        ser_setup_config_box(b, midsession, 0x1F, 0x01F);
 
     /*
      * $XAUTHORITY is not reliable on Windows, so we provide a

windows/winser.c

@@ -170,6 +170,11 @@ static const char *serial_configure(Serial serial, HANDLE serport, Conf *conf)
 	    dcb.fOutxDsrFlow = TRUE;
 	    str = "DSR/DTR";
 	    break;
+      case SER_FLOW_NONE_DTR_RTS_DIS:
+	    str = "Disable DTR/RTS";
+        dcb.fDtrControl = DTR_CONTROL_DISABLE;
+        dcb.fRtsControl = RTS_CONTROL_DISABLE;
+	    break;
 	}
 	msg = dupprintf("Configuring %s flow control", str);
 	logevent(serial->frontend, msg);