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
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -92,6 +92,7 @@
};
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 @@
.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 @@
{ 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 @@
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
*
