Date: Tue, 9 Jan 2007 21:37:21 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-usb@freebsd.org Cc: Luigi Rizzo <rizzo@icir.org> Subject: Re: any way to detect usb detached from a device driver ? Message-ID: <200701092137.22421.hselasky@c2i.net> In-Reply-To: <20070109083450.A75138@xorpc.icir.org> References: <20070109083450.A75138@xorpc.icir.org>
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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
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