[patch 54/76] USB: ftdi_sio: Workaround for broken Matrix Orbital serial port

[Chris Wright]

-stable review patch.  If anyone has any objections, please let us know.
---------------------

From: Kevin Vance <kvance@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
[chrisw@xxxxxxxxxxxx: backport to 2.6.24.3 w/out ftdi_jtag_probe]
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
---
 drivers/usb/serial/ftdi_sio.c |   24 ++++++++++++++++++++++++
 drivers/usb/serial/ftdi_sio.h |    7 +++++++
 2 files changed, 31 insertions(+)

--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -310,6 +310,7 @@ struct ftdi_sio_quirk {
 };
 
 static int   ftdi_olimex_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);
 
@@ -317,6 +318,10 @@ static struct ftdi_sio_quirk ftdi_olimex
 	.probe	= ftdi_olimex_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,
 };
@@ -379,6 +384,8 @@ static struct usb_device_id id_table_com
 	{ 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) },
@@ -1301,6 +1308,23 @@ static int ftdi_olimex_probe(struct usb_
 	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
  *
--- a/drivers/usb/serial/ftdi_sio.h
+++ b/drivers/usb/serial/ftdi_sio.h
@@ -98,6 +98,13 @@
 #define FTDI_MTXORB_5_PID      0xFA05  /* Matrix Orbital Product Id */
 #define FTDI_MTXORB_6_PID      0xFA06  /* Matrix Orbital Product Id */
 
+/*
+ * 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

-- 
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