[patch 4/8] usbtouchscreen: find input endpoint automatically

[patch 4/8] usbtouchscreen: find input endpoint automatically

[akpm]

From: Ondrej Zary <linux@rainbow-software.org>

Find input enpoint automatically instead of assuming that the first one is
OK.  This is needed for devices with multiple endpoints such as iNexio
where the first endpoint might be output.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: Jim Persson <jim-linux@nurd.se>
Cc: Florian Echtler <floe@butterbrot.org>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Daniel Ritz <daniel.ritz@gmx.ch>
Cc: Greg KH <greg@kroah.com>
Cc: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/input/touchscreen/usbtouchscreen.c |   12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff -puN drivers/input/touchscreen/usbtouchscreen.c~usbtouchscreen-find-input-endpoint-automatically drivers/input/touchscreen/usbtouchscreen.c
--- a/drivers/input/touchscreen/usbtouchscreen.c~usbtouchscreen-find-input-endpoint-automatically
+++ a/drivers/input/touchscreen/usbtouchscreen.c
@@ -1057,17 +1057,25 @@ static int usbtouch_probe(struct usb_int
 	struct usbtouch_usb *usbtouch;
 	struct input_dev *input_dev;
 	struct usb_host_interface *interface;
-	struct usb_endpoint_descriptor *endpoint;
+	struct usb_endpoint_descriptor *endpoint = NULL;
 	struct usb_device *udev = interface_to_usbdev(intf);
 	struct usbtouch_device_info *type;
 	int err = -ENOMEM;
+	int i;
 
 	/* some devices are ignored */
 	if (id->driver_info == DEVTYPE_IGNORE)
 		return -ENODEV;
 
 	interface = intf->cur_altsetting;
-	endpoint = &interface->endpoint[0].desc;
+	/* find first input endpoint */
+	for (i = 0; i < interface->desc.bNumEndpoints; i++)
+		if (usb_endpoint_dir_in(&interface->endpoint[i].desc)) {
+			endpoint = &interface->endpoint[i].desc;
+			break;
+		}
+	if (!endpoint)
+		return -ENXIO;
 
 	usbtouch = kzalloc(sizeof(struct usbtouch_usb), GFP_KERNEL);
 	input_dev = input_allocate_device();
_