--- ftdi_sio.c.orig	2011-03-27 11:01:41.000000000 -0800
+++ ftdi_sio.c	2015-10-30 13:18:40.879000032 -0800
@@ -949,7 +949,7 @@
 	static const unsigned char divfrac[8] = { 0, 3, 2, 4, 1, 5, 6, 7 };
 	__u32 divisor;
 	/* divisor shifted 3 bits to the left */
-	int divisor3 = base / 2 / baud;
+	int divisor3 = (base / 2 + baud / 2) / baud;
 	divisor = divisor3 >> 3;
 	divisor |= (__u32)divfrac[divisor3 & 0x7] << 14;
 	/* Deal with special cases for highest baud rates. */
@@ -1087,6 +1087,17 @@
 	baud = tty_get_baud_rate(tty);
 	dbg("%s - tty_get_baud_rate reports speed %d", __func__, baud);
 
+	/*
+	 * FreeCalypso hack: translate non-std high
+	 * baud rates for GSM like CP2102 does.
+	 */
+	if (baud == 230400)
+		baud = 203125;
+	else if (baud == 460800)
+		baud = 406250;
+	else if (baud == 921600)
+		baud = 812500;
+
 	/* 2. Observe async-compatible custom_divisor hack, update baudrate
 	   if needed */