Date: Sun, 21 Mar 2010 14:15:03 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: Martin Laabs <mailinglists@martinlaabs.de> Cc: freebsd-usb@freebsd.org Subject: Re: Find Vendor/Product ID from uhid device Message-ID: <201003211415.03564.hselasky@c2i.net> In-Reply-To: <4BA60B0A.3040005@martinlaabs.de> References: <4BA52239.8000300@martinlaabs.de> <201003211134.28085.hselasky@c2i.net> <4BA60B0A.3040005@martinlaabs.de>
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On Sunday 21 March 2010 13:03:22 Martin Laabs wrote: > Hello Hans, Hi Martin, > > Hans Petter Selasky wrote: > > I would recommend you use libusb in userland to do this. Then you get all > > the information you need for the ID-match and more. > > Unfortunately the linux-js driver creates a new device in /dev/input which > is IMHO impossible for a userland program. So I have to detect the usb > devices in kernel space. That is not true. Search Google for cuse4bsd :-) > > If that is not desirable, we > > > can add that information like an IOCTL. usbconfig show_ifdrv might also > > give you some clues. > > Yes - in fact. I.e. the output I am interested in is > ugen2.2.0: uhid0: <Logitech Logitech Extreme 3D, class 0/0, rev 1.10/2.04, > addr 2> > Now I could figure out that ugen2.2.0 has idVendor=0x046d idProduct=0xc215 > with usbconfig dump_device_desc. After that the driver would check that ids > against its database and if it would match it would use the /dev/uhid0 > device. (with kopen - see below) > > > Do you think it is much effort to add a ioctl to the uhid driver that > reports the corresponding usb_device_info struct? This would make porting > the linux-js driver much more simple for me. > Or is there a (simple accessible) data structure inside the kernel where I > can get the information which vendor/product id correspond to a uhidX > attached device? This should be quite trivial, if cuse4bsd does not help anything. Just an idea: Maybe we can import the linux-js driver into the webcamd framework? Could you have a look at it. Then the code changes will be minimal! --HPS http://www.selasky.org/hans_petter/video4bsd
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