Messages in this thread | | | Subject | Re: 2.5.61/usb: ioctl control transfer | Date | Sat, 15 Feb 2003 23:01:22 +0100 | From | (Andreas Jellinghaus) |
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I'm using the devfs from a userspace application. the ioctl USBDEVFS_CONTROL is supposed to return the number of bytes actualy read from a control transfer.
but the return code i get is always what i specified as length of the buffer.
since i'm using the same usb control transfers as the windows drivers and get the same result back (but return code is always wLength), i wonder if there is a bug in the kernel. Anyone has similiar problems?
Regards, Andreas (userspace code ...) syslog(LOG_DEBUG, "usb xmit %02hx %02hx %02hx %02hx 00 00 %02hx %02hx\n" , type, req, value >> 8, value&0xff, size >> 8, size & 0xff);
if (! (type & 0x80)) debug_hexdump("Sending:", buf, size);
rc = ioctl(fd, USBDEVFS_CONTROL, &ctrl); if (rc == -1) { syslog(LOG_ERR, "usb ioctl control transfer failed:%s\n", strerror(errno)); } syslog(LOG_DEBUG, "ioctl rc %hx size %hx length %hx", rc, size, ctrl.length); if (type & 0x80) debug_hexdump("Received:", buf, size);
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