tree 75c9890f5b1480e9680d5fa2d844cc9202ed4ac9
parent 9c03f1622af051004416dd3e24d8a0fa31e34178
author Alan Ott <alan@signal11.us> 1285154382 +0200
committer Jiri Kosina <jkosina@suse.cz> 1285154382 +0200

HID: don't Send Feature Reports on Interrupt Endpoint

Feature reports should only be sent on the control endpoint.

The USB HID standard is unclear and confusing on this issue. It seems to
suggest that Feature reports can be sent on a HID device's Interrupt OUT
endpoint.  This cannot be the case because the report type is not encoded in
transfers sent out the Interrput OUT endpoint.  If Feature reports were sent on
the Interrupt OUT endpint, they would be indistinguishable from Output reports
in the case where Report IDs were not used.

Further, Windows and Mac OS X do not send Feature reports out the interrupt OUT
Endpoint.  They will only go out the Control Endpoint.

In addition, many devices simply do not hande Feature reports sent out the
Interrupt OUT endpoint.

Reported-by: simon@mungewell.org
Signed-off-by: Alan Ott <alan@signal11.us>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>