linux-kernel - [PATCH 2/3] usbtouchscreen: find input endpoint automatically

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Date:	Mon, 23 Nov 2009 11:04:40 +0100
From:	Ondrej Zary <linux@...nbow-software.org>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	linux-usb@...r.kernel.org, daniel.ritz@....ch,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] usbtouchscreen: find input endpoint automatically

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@...nbow-software.org>

--- linux-source-2.6.31/drivers/input/touchscreen/usbtouchscreen.c.1	2009-11-23 10:30:14.000000000 +0100
+++ linux-source-2.6.31/drivers/input/touchscreen/usbtouchscreen.c	2009-11-23 10:57:14.000000000 +0100
@@ -882,17 +882,25 @@ 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();


-- 
Ondrej Zary
--
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