I have a device based on an EZUSB-FX2 part. It sends data with ISO
packets. My code uses the usbdevice_fs calls. It works on several
systems with 1.1 USB ports, but not on a 2.0 system. The call to
ioctl (device_fd, USBDEVFS_SUBMITURB, urb)
gets an error return -EINVAL.
There was a patch someone posted a while back, to set urb->interval when used with usbfs. I remember the patch being incorrect, since it assumed the interval was always 1 frame (or 1 uframe, at high speed), but likely that's your basic problem -- kernel bug.
You may also run into some problem with ISO support through EHCI. The high speed ISO code was recently replaced; try it on the latest kernels (2.6.2, 2.4.25-rc) and see if that behaves. Full speed ISO support is in the works, with split transactions and all.
- Dave
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