USB: serial: belkin_sa: Various needed fixes

Use the baud rate stuff from the kernel don't parse CBAUD directly
Remove pointless and wrong 'no change' check

Could do with some good testing as well but again better than adding &&
BROKEN

(The use of BELKIN_SA_BAUD() might seem a bit odd but x/a = b and x/b =
a (rounded for integers)).
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/belkin_sa.c

@@ -349,6 +349,7 @@ static void belkin_sa_set_termios (struct usb_serial_port *port, struct ktermios
 	unsigned long flags;
 	unsigned long control_state;
 	int bad_flow_control;
+	speed_t baud;
 	
 	if ((!port->tty) || (!port->tty->termios)) {
 		dbg ("%s - no tty or termios structure", __FUNCTION__);
@@ -364,16 +365,8 @@ static void belkin_sa_set_termios (struct usb_serial_port *port, struct ktermios
 	bad_flow_control = priv->bad_flow_control;
 	spin_unlock_irqrestore(&priv->lock, flags);
 	
-	/* check that they really want us to change something */
-	if (old_termios) {
-		if ((cflag == old_termios->c_cflag) &&
-		    (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
-			dbg("%s - nothing to change...", __FUNCTION__);
-			return;
-		}
-		old_iflag = old_termios->c_iflag;
-		old_cflag = old_termios->c_cflag;
-	}
+	old_iflag = old_termios->c_iflag;
+	old_cflag = old_termios->c_cflag;
 
 	/* Set the baud rate */
 	if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
@@ -387,38 +380,30 @@ static void belkin_sa_set_termios (struct usb_serial_port *port, struct ktermios
 				if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 1) < 0)
 					err("Set RTS error");
 		}
+	}
 
-		switch(cflag & CBAUD) {
-			case B0: /* handled below */ break;
-			case B300: urb_value = BELKIN_SA_BAUD(300); break;
-			case B600: urb_value = BELKIN_SA_BAUD(600); break;
-			case B1200: urb_value = BELKIN_SA_BAUD(1200); break;
-			case B2400: urb_value = BELKIN_SA_BAUD(2400); break;
-			case B4800: urb_value = BELKIN_SA_BAUD(4800); break;
-			case B9600: urb_value = BELKIN_SA_BAUD(9600); break;
-			case B19200: urb_value = BELKIN_SA_BAUD(19200); break;
-			case B38400: urb_value = BELKIN_SA_BAUD(38400); break;
-			case B57600: urb_value = BELKIN_SA_BAUD(57600); break;
-			case B115200: urb_value = BELKIN_SA_BAUD(115200); break;
-			case B230400: urb_value = BELKIN_SA_BAUD(230400); break;
-			default: err("BELKIN USB Serial Adapter: unsupported baudrate request, using default of 9600");
-				urb_value = BELKIN_SA_BAUD(9600); break;
-		}
-		if ((cflag & CBAUD) != B0 ) {
-			if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
-				err("Set baudrate error");
-		} else {
-			/* Disable flow control */
-			if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
-				err("Disable flowcontrol error");
-
-			/* Drop RTS and DTR */
-			control_state &= ~(TIOCM_DTR | TIOCM_RTS);
-			if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
-				err("DTR LOW error");
-			if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
-				err("RTS LOW error");
-		}
+	baud = tty_get_baud_rate(port->tty);
+	urb_value = BELKIN_SA_BAUD(baud);
+	/* Clip to maximum speed */
+	if (urb_value == 0)
+		urb_value = 1;
+	/* Turn it back into a resulting real baud rate */
+	baud = BELKIN_SA_BAUD(urb_value);
+	/* FIXME: Once the tty updates are done then push this back to the tty */
+
+	if ((cflag & CBAUD) != B0 ) {
+		if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
+			err("Set baudrate error");
+	} else {
+		/* Disable flow control */
+		if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
+			err("Disable flowcontrol error");
+		/* Drop RTS and DTR */
+		control_state &= ~(TIOCM_DTR | TIOCM_RTS);
+		if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
+			err("DTR LOW error");
+		if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
+			err("RTS LOW error");
 	}
 
 	/* set the parity */
@@ -438,7 +423,7 @@ static void belkin_sa_set_termios (struct usb_serial_port *port, struct ktermios
 			case CS6: urb_value = BELKIN_SA_DATA_BITS(6); break;
 			case CS7: urb_value = BELKIN_SA_DATA_BITS(7); break;
 			case CS8: urb_value = BELKIN_SA_DATA_BITS(8); break;
-			default: err("CSIZE was not CS5-CS8, using default of 8");
+			default: dbg("CSIZE was not CS5-CS8, using default of 8");
 				urb_value = BELKIN_SA_DATA_BITS(8);
 				break;
 		}