USB: ftdi_sio: Workaround for broken Matrix Orbital serial port

Workaround for the FT232RL-based, Matrix Orbital VK204-25-USB serial port
added to the ftdi_sio driver.

The device has an invalid endpoint descriptor, which must be modified
before it can be used.

Signed-off-by: Kevin Vance <kvance@kvance.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 76db2fe..17b2cc0 100644 (file)
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -92,6 +92,7 @@ struct ftdi_sio_quirk {
 };
 
 static int   ftdi_jtag_probe           (struct usb_serial *serial);
+static int   ftdi_mtxorb_hack_setup    (struct usb_serial *serial);
 static void  ftdi_USB_UIRT_setup       (struct ftdi_private *priv);
 static void  ftdi_HE_TIRA1_setup       (struct ftdi_private *priv);
 
@@ -99,6 +100,10 @@ static struct ftdi_sio_quirk ftdi_jtag_quirk = {
        .probe  = ftdi_jtag_probe,
 };
 
+static struct ftdi_sio_quirk ftdi_mtxorb_hack_quirk = {
+       .probe  = ftdi_mtxorb_hack_setup,
+};
+
 static struct ftdi_sio_quirk ftdi_USB_UIRT_quirk = {
        .port_probe = ftdi_USB_UIRT_setup,
 };
@@ -161,6 +166,8 @@ static struct usb_device_id id_table_combined [] = {
        { USB_DEVICE(FTDI_VID, FTDI_MTXORB_4_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MTXORB_5_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_MTXORB_6_PID) },
+       { USB_DEVICE(MTXORB_VK_VID, MTXORB_VK_PID),
+               .driver_info = (kernel_ulong_t)&ftdi_mtxorb_hack_quirk },
        { USB_DEVICE(FTDI_VID, FTDI_PERLE_ULTRAPORT_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_PIEGROUP_PID) },
        { USB_DEVICE(FTDI_VID, FTDI_TNC_X_PID) },
@@ -1088,6 +1095,23 @@ static int ftdi_jtag_probe(struct usb_serial *serial)
        return 0;
 }
 
+/*
+ * The Matrix Orbital VK204-25-USB has an invalid IN endpoint.
+ * We have to correct it if we want to read from it.
+ */
+static int ftdi_mtxorb_hack_setup(struct usb_serial *serial)
+{
+       struct usb_host_endpoint *ep = serial->dev->ep_in[1];
+       struct usb_endpoint_descriptor *ep_desc = &ep->desc;
+
+       if (ep->enabled && ep_desc->wMaxPacketSize == 0) {
+               ep_desc->wMaxPacketSize = 0x40;
+               info("Fixing invalid wMaxPacketSize on read pipe");
+       }
+
+       return 0;
+}
+
 /* ftdi_shutdown is called from usbserial:usb_serial_disconnect
  *   it is called when the usb device is disconnected
  *

diff --git a/drivers/usb/serial/ftdi_sio.h b/drivers/usb/serial/ftdi_sio.h
index 6eee2ab..e1eb742 100644 (file)
--- a/drivers/usb/serial/ftdi_sio.h
+++ b/drivers/usb/serial/ftdi_sio.h
@@ -102,6 +102,13 @@
  * (http://www.joernonline.de/dw/doku.php?id=start&idx=projects:oocdlink) */
 #define FTDI_OOCDLINK_PID      0xbaf8  /* Amontec JTAGkey */
 
+/*
+ * The following are the values for the Matrix Orbital VK204-25-USB
+ * display, which use the FT232RL.
+ */
+#define MTXORB_VK_VID          0x1b3d
+#define MTXORB_VK_PID          0x0158
+
 /* Interbiometrics USB I/O Board */
 /* Developed for Interbiometrics by Rudolf Gugler */
 #define INTERBIOMETRICS_VID              0x1209