Date: Mon, 9 Nov 2015 09:31:12 +0100 From: Hans Petter Selasky <hps@selasky.org> To: Callum Aitchison <callum@aitchison.org>, freebsd-usb@freebsd.org Subject: Re: usbfs (usbdevfs) in Linux Emulation Message-ID: <564059D0.8000400@selasky.org> In-Reply-To: <7558FEE0-F0EF-440B-98C2-9EE428C352E1@aitchison.org> References: <7558FEE0-F0EF-440B-98C2-9EE428C352E1@aitchison.org>
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On 11/08/15 17:14, Callum Aitchison wrote: > Hi, > I posted on the forum about this issue and was directed here as a better place to ask. > > My question is about usbfs (AKA usbdevfs) emulation within Linux compatibility - it doesn’t get created in the Linuxulator but some binary Linux software (Altera Quartus) I’m using requires it instead of libusb. > > The system is documented here: https://www.kernel.org/doc/Documentation/usb/proc_usb_info.txt > > I have tried unmounting linprocfs and creating my own /compat/linux/proc directory with bus/usb/devices copied from a Linux machine for the USB device listed and then the device location in bus/usb/002/007 symlinked to the FreeBSD USB device in /dev/ugen0.2. This, unsurprisingly, didn’t work since the Linux nodes are obviously different from the FreeBSD nodes. Worth a try. > > When I tried that dmesg printed the errors: > linux: pid 4640 (jtagd): ioctl fd=6, cmd=0x550f ('U',15) is not implemented > linux: pid 4640 (jtagd): ioctl fd=6, cmd=0x5510 ('U',16) is not implemented > > Looking these up in the Linux headers in linux/usbdevice_fs.h I found: > #define USBDEVFS_CLAIMINTERFACE _IOR('U', 15, unsigned int) > #define USBDEVFS_RELEASEINTERFACE _IOR('U', 16, unsigned int) > > Obviously the software was trying to claim and then release the USB interface but the ioctl must differ between FreeBSD and Linux so it doesn’t work, makes sense. > > Unfortunately I don’t understand the FreeBSD or Linux USB systems enough to work out a solution myself but I hope that there is either a pre-existing solution or a solution that could be worked out. > I thought perhaps a translation layer between the Linux /proc/bus/usb/ and FreeBSD /dev/ugen* but have no idea where to start implementing that myself. > > Hopefully it can be sorted, it’d be nice to have all the USB stuff working in Linux emulation, especially to be able to do my FPGA development entirely in FreeBSD. > Hi, The FreeBSD's /dev/ugenX.Y don't support Linux's USBFS. It might be you can build Linux's USBFS support into /usr/ports/multimedia/webcamd, which already emulate the Linux USB stack in user-space. Latest version of webcamd from SVN: http://www.selasky.org/hans_petter/video4bsd --HPS
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