Date: Mon, 30 Aug 2010 14:41:56 +0200 From: Piet Skiet <tuksgig@gmail.com> To: freebsd-usb@freebsd.org Subject: Re: USB synchronous control transfers (for usb-to-serial) Message-ID: <AANLkTikAnF_OqNDjCBdJcXRXrvLC9XdqHyR4b3pS68X6@mail.gmail.com> In-Reply-To: <AANLkTinr3KbWOqgQoKVvF84H2c02fHh9SQRDeUkSRn4B@mail.gmail.com> References: <AANLkTinr3KbWOqgQoKVvF84H2c02fHh9SQRDeUkSRn4B@mail.gmail.com>
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On Mon, Aug 30, 2010 at 10:51 AM, Piet Skiet <tuksgig@gmail.com> wrote: > Hi, > > Can anyone clarify how to go about doing a synchronous usb control > transfer, similar to Linux's=A0usb_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=A0usbd_transfer_submit, but they're > not synchronous. What about using=A0usbd_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_pro= c has somehting to do with blocking control transfers. Am I on the right track here?
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