Date: Wed, 9 Jan 2008 19:34:53 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: Mikhail Teterin <mi+kde@aldan.algebra.com> Cc: johnjen@reynoldsnet.org, R.Tobin@ed.ac.uk, usb@freebsd.org Subject: Re: BlackBerry (Re: using libusb) Message-ID: <200801091934.54053.hselasky@c2i.net> In-Reply-To: <200801091015.17730@aldan> References: <200801090114.56195@aldan> <200801091015.17730@aldan>
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On Wednesday 09 January 2008, Mikhail Teterin wrote:
> = I'm trying to port a suit called "barry", which provides a library and
> some = utilities to work with RIM's BlackBerry devices.
>
> = It compiles cleanly, but fails to find a connected device at run time. In
> = fact, it fails to find _any_ devices, even though ``usbdevs -v'' lists
> = several including the BlackBerry
>
> Ok, I see, what's happening... The current implementation of libusb's BSD
> support (bsd.c) ignores all devices other than ``ugen'':
>
> if (strncmp(di.udi_devnames[0], "ugen", 4) != 0) {
> /* best not to play with things we don't understand */
> continue;
>
> And BlackBerry is identified as ``umass'' here :(
>
> Not sure, how best to solve this -- commenting out the above-quoted "if"
> simply leads to a failure later, because the code will look for
> /dev/umassX, which simply would not exist -- umass0 is da3 here. But it
> might be da0 somewhere else, and there is no way to know, which is which
> :-(
>
> But even if one could figure this out and specify the device to the tool
> explicitly, daX will not understand ugen's ioctls anyway...
>
> What a retarded mess...
>
> We really need the low-level (ugen?) interfaces available for all
> USB-devices -- even those, which are /also/ handled by higher-level
> interfaces (like ulpt, uscan, umass). As things stand, the higher-level
> ones are "greedy" and will prevent ugen from appearing, even if one wanted
> to.
Hi Mikhail,
Yes, you are completely right. And this is not very far away from happening.
I've wanted to do this for a long time, but have found no time yet.
My plan is to extend /dev/usbX so that it becomes a so-called clonable device.
When you open up "/dev/usb0.2.3" for example, you open up the device having
index 2 on USB bus 0 and endpoint 3. This will need some modifications in
libusb. Ugen will still be there, but I plan to move the functionality over
to "usb.c". Accessing endpoints will then work regardless of what drivers are
hooked on.
Some open problems that needs to be resolved:
Should we allow parallell access to USB interfaces?
And what about rights management?
>
> Hans, any hope? Thank you!
>
In the end of the tunnel :-)
--HPS
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