MFC r261004, r261005 and r261033:
Adjust the DMA delay logic so that the DMA delay does not become too small.
MFC r261123:
Reduce dmesg verbosity.
MFC r261134:
Add more USB quirks.
MFC r261224:
Comply to the official LibUSB v1.0 API:
"It is legal to attempt to claim an already-claimed interface."
MFC r261228:
When detaching a [USB] keyboard, keys might still be pressed. Ensure
that all pressed keys are released before completing the USB keyboard
detach. This will prevent so-called "ghost-keys" from appearing after
that the USB device generating the key event(s) has been detached.