On Mon, Aug 30, 2010 at 10:51 AM, Piet Skiet <tuks...@gmail.com> wrote:
> Hi,
> Can anyone clarify how to go about doing a synchronous usb control
> transfer, similar to Linux's usb_control_msg? I want to implement the
> TIOCMGET ioctl on a usb-to-serial converter. The Linux driver uses
> synchronous control messages to read DCE and CTS serial pin status,
> and I want to do something similar in FreeBSD. The usbdi(9) manpage
> talks about control transfers using usbd_transfer_submit, but they're
> not synchronous. What about using usbd_transfer_drain? Is there an
> example driver showing setting up and doing control transfers?
> The ucom driver seems to only implement TIOCSBRK and TIOCCBRK iotcls
> at the moment.
> Thanks

Scanning through the ucom code, it seems to me that the usbd_do_request_proc
has somehting to do with blocking control transfers. Am I on the right
track here?
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