Input: appletouch - refactor endpoint lookup

Use the common USB helpers for looking up interrupt-in endpoints (and
determining endpoint numbers) instead of open coding.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260330095948.1663141-3-johan@kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: jhovold

drivers/input/mouse/appletouch.c

@@ -829,29 +829,20 @@ static int atp_probe(struct usb_interface *iface,
 	struct atp *dev;
 	struct input_dev *input_dev;
 	struct usb_device *udev = interface_to_usbdev(iface);
-	struct usb_host_interface *iface_desc;
-	struct usb_endpoint_descriptor *endpoint;
-	int int_in_endpointAddr = 0;
-	int i, error = -ENOMEM;
+	struct usb_endpoint_descriptor *ep;
+	int error;
 	const struct atp_info *info = (const struct atp_info *)id->driver_info;
 
 	/* set up the endpoint information */
 	/* use only the first interrupt-in endpoint */
-	iface_desc = iface->cur_altsetting;
-	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
-		endpoint = &iface_desc->endpoint[i].desc;
-		if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) {
-			/* we found an interrupt in endpoint */
-			int_in_endpointAddr = endpoint->bEndpointAddress;
-			break;
-		}
-	}
-	if (!int_in_endpointAddr) {
+	error = usb_find_int_in_endpoint(iface->cur_altsetting, &ep);
+	if (error) {
 		dev_err(&iface->dev, "Could not find int-in endpoint\n");
 		return -EIO;
 	}
 
 	/* allocate memory for our device state and initialize it */
+	error = -ENOMEM;
 	dev = kzalloc_obj(*dev);
 	input_dev = input_allocate_device();
 	if (!dev || !input_dev) {
@@ -875,7 +866,7 @@ static int atp_probe(struct usb_interface *iface,
 		goto err_free_urb;
 
 	usb_fill_int_urb(dev->urb, udev,
-			 usb_rcvintpipe(udev, int_in_endpointAddr),
+			 usb_rcvintpipe(udev, usb_endpoint_num(ep)),
 			 dev->data, dev->info->datalen,
 			 dev->info->callback, dev, 1);