From 71d9a2b95fc9c9474d46d764336efd7a5a805555 Mon Sep 17 00:00:00 2001 From: Adrian Thomasset Date: Wed, 24 Apr 2013 11:37:35 +0100 Subject: [PATCH] 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 Cc: stable Signed-off-by: Greg Kroah-Hartman --- 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 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; + if (interface == udev->actconfig->interface[0] || + interface == udev->actconfig->interface[1]) { + dev_info(&udev->dev, "Ignoring serial port reserved for JTAG\n"); + return -ENODEV; + } - dev_info(&udev->dev, "Ignoring serial port reserved for JTAG\n"); - - return -ENODEV; + return 0; } /*