[ 3.5.y.z extended stable ] Patch "USB: ftdi_sio: enable two UART ports on ST Microconnect Lite" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    USB: ftdi_sio: enable two UART ports on ST Microconnect Lite

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From e3ad2fbbcd53cfff16303b7c402757600f61be94 Mon Sep 17 00:00:00 2001
From: Adrian Thomasset <adrian.thomasset at st.com>
Date: Wed, 24 Apr 2013 11:37:35 +0100
Subject: [PATCH] USB: ftdi_sio: enable two UART ports on ST Microconnect Lite

commit 71d9a2b95fc9c9474d46d764336efd7a5a805555 upstream.

The FT4232H used in the ST Micro Connect Lite has four hi-speed UART ports.
The first two ports are reserved for the JTAG interface.

We enable by default ports 2 and 3 as UARTs (where port 2 is a
conventional RS-232 UART)

Signed-off-by: Adrian Thomasset <adrian.thomasset at st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/usb/serial/ftdi_sio.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index ecfd525..d5b9a74 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1799,20 +1799,24 @@ static int ftdi_8u2232c_probe(struct usb_serial *serial)
 }

 /*
- * First and second port on STMCLiteadaptors is reserved for JTAG interface
- * and the forth port for pio
+ * First two ports on JTAG adaptors using an FT4232 such as STMicroelectronics's
+ * ST Micro Connect Lite are reserved for JTAG or other non-UART interfaces and
+ * can be accessed from userspace.
+ * The next two ports are enabled as UARTs by default, where port 2 is
+ * a conventional RS-232 UART.
  */
 static int ftdi_stmclite_probe(struct usb_serial *serial)
 {
 	struct usb_device *udev = serial->dev;
 	struct usb_interface *interface = serial->interface;

-	if (interface == udev->actconfig->interface[2])
-		return 0;
-
-	dev_info(&udev->dev, "Ignoring serial port reserved for JTAG\n");
+	if (interface == udev->actconfig->interface[0] ||
+	    interface == udev->actconfig->interface[1]) {
+		dev_info(&udev->dev, "Ignoring serial port reserved for JTAG\n");
+		return -ENODEV;
+	}

-	return -ENODEV;
+	return 0;
 }

 /*
--
1.8.1.2