[Bug 244718] [patch] WMT driver usb framelength

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244718

            Bug ID: 244718
           Summary: [patch] WMT driver usb framelength
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: usb
          Assignee: usb at FreeBSD.org
          Reporter: oskar.holmlund at ohdata.se
 Attachment #212306 text/plain
         mime type:

Created attachment 212306
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=212306&action=edit
Patch for wmt driver.

Attached patch diff from r358834

CiVUE ACB-C27003 with controller EETI EXC80W32/P80H32 (newer eGalax
multitouch).

If usb frame length is set to 1024 bytes (WMT_BSIZE) the EETI controller will
pack multiple touch events in the packet and the current code will only process
the first touch event. (line 500: usbd_copy_out will only copy the first 64
bytes). As a result some important events are lost like releasing the finger
from the touchscreen :)

Just let the hardware report its maximum packet size.

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