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authorAdrian Thomasset <adrian.thomasset@st.com>2013-04-24 11:37:35 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-24 09:05:30 -0700
commit71d9a2b95fc9c9474d46d764336efd7a5a805555 (patch)
tree372354a37f06e120034126dfd874d2cf3d12bc53 /drivers
parentee5d5499edb94cd03738a52a7e234b139da8fd72 (diff)
downloadlinux-71d9a2b95fc9c9474d46d764336efd7a5a805555.tar.bz2
USB: ftdi_sio: enable two UART ports on ST Microconnect Lite
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@st.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/serial/ftdi_sio.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index e4d7fbd7e4e7..242b5776648a 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1789,20 +1789,24 @@ 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;
}
/*