On Tuesday 09 January 2007 17:34, Luigi Rizzo wrote: > [sorry for the repost, not sure it went through] > > On Tue, Jan 09, 2007 at 08:16:29AM -0800, Luigi Rizzo wrote: > I am modifying a kernel device driver for webcams > (see http://info.iet.unipi.it/~luigi/FreeBSD/usb-cameras.html) > packing together various projects around, and i was wondering > how to handle the situation of a device being > detached while in use.
If you look at the my USB driver for FreeBSD, http://www.turbocat.net/~hselasky/usb4bsd , there has been created a new device system, usb_cdev, with that goal in mind that you should not have to worry about detaching devices, hence this is somewhat complicated: http://www.turbocat.net/~hselasky/isdn4bsd/sources/src/sys/dev/usb/usb_cdev.c For example, have a look a the new URIO driver: http://www.turbocat.net/~hselasky/isdn4bsd/sources/src/sys/dev/usb/urio.c > > Right now the code (from ports/multimedia/pwcbsd) detects > that the device is in use while the driver-specific USB_DETACH > routine is called, however then it goes on without doing > anything. Very bad! > > In another driver in the dree (urio.c) i see the driver > calls usb_detach_wait() to wait up to 60s for the > drivers to complete. However that function is not documented > and used a bit inconsistently in the rest of /sys/dev/usb > --HPS _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "[EMAIL PROTECTED]"
