IABSD.fr/src/sys/dev/usb/ugen.c

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• Author : guenther
  Date : 2024-12-30 02:46:00
  Hash : b9ae17a0
  Message : All the device and file type ioctl routines just ignore FIONBIO, so stop calling down into those layer from fcntl(F_SETFL) or ioctl(FIONBIO) and delete the "do nothing for this" stubs in all the *ioctl routines. ok dlg@

• sys/dev/usb/ugen.c

• /*	$OpenBSD: ugen.c,v 1.119 2024/12/30 02:46:00 guenther Exp $ */
  /*	$NetBSD: ugen.c,v 1.63 2002/11/26 18:49:48 christos Exp $	*/
  /*	$FreeBSD: src/sys/dev/usb/ugen.c,v 1.26 1999/11/17 22:33:41 n_hibma Exp $	*/
  
  /*
   * Copyright (c) 1998 The NetBSD Foundation, Inc.
   * All rights reserved.
   *
   * This code is derived from software contributed to The NetBSD Foundation
   * by Lennart Augustsson (lennart@augustsson.net) at
   * Carlstedt Research & Technology.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/malloc.h>
  #include <sys/device.h>
  #include <sys/ioctl.h>
  #include <sys/conf.h>
  #include <sys/tty.h>
  #include <sys/fcntl.h>
  #include <sys/selinfo.h>
  #include <sys/vnode.h>
  
  #include <machine/bus.h>
  
  #include <dev/usb/usb.h>
  #include <dev/usb/usbdi.h>
  #include <dev/usb/usbdi_util.h>
  
  #ifdef UGEN_DEBUG
  #define DPRINTF(x)	do { if (ugendebug) printf x; } while (0)
  #define DPRINTFN(n,x)	do { if (ugendebug>(n)) printf x; } while (0)
  int	ugendebug = 0;
  #else
  #define DPRINTF(x)
  #define DPRINTFN(n,x)
  #endif
  
  #define	UGEN_CHUNK	128	/* chunk size for read */
  #define	UGEN_IBSIZE	1020	/* buffer size */
  #define	UGEN_BBSIZE	1024
  
  #define	UGEN_NISOFRAMES	500	/* 0.5 seconds worth */
  #define UGEN_NISOREQS	6	/* number of outstanding xfer requests */
  #define UGEN_NISORFRMS	4	/* number of frames (milliseconds) per req */
  
  struct ugen_endpoint {
  	struct ugen_softc *sc;
  	usb_endpoint_descriptor_t *edesc;
  	struct usbd_interface *iface;
  	int state;
  #define	UGEN_ASLP	0x02	/* waiting for data */
  #define UGEN_SHORT_OK	0x04	/* short xfers are OK */
  	struct usbd_pipe *pipeh;
  	struct clist q;
  	struct selinfo rsel;
  	u_char *ibuf;		/* start of buffer (circular for isoc) */
  	size_t  ibuflen;
  	u_char *fill;		/* location for input (isoc) */
  	u_char *limit;		/* end of circular buffer (isoc) */
  	u_char *cur;		/* current read location (isoc) */
  	u_int32_t timeout;
  	struct isoreq {
  		struct ugen_endpoint *sce;
  		struct usbd_xfer *xfer;
  		void *dmabuf;
  		u_int16_t sizes[UGEN_NISORFRMS];
  	} isoreqs[UGEN_NISOREQS];
  };
  
  struct ugen_softc {
  	struct device sc_dev;		/* base device */
  	struct usbd_device *sc_udev;
  
  	char sc_is_open[USB_MAX_ENDPOINTS];
  	struct ugen_endpoint sc_endpoints[USB_MAX_ENDPOINTS][2];
  #define OUT 0
  #define IN  1
  
  	int sc_refcnt;
  	u_char sc_secondary;
  };
  
  void ugenintr(struct usbd_xfer *, void *, usbd_status);
  void ugen_isoc_rintr(struct usbd_xfer *, void *, usbd_status);
  int ugen_do_read(struct ugen_softc *, int, struct uio *, int);
  int ugen_do_write(struct ugen_softc *, int, struct uio *, int);
  int ugen_do_ioctl(struct ugen_softc *, int, u_long, caddr_t, int,
  	struct proc *);
  int ugen_do_close(struct ugen_softc *, int, int);
  int ugen_set_config(struct ugen_softc *, int);
  int ugen_set_interface(struct ugen_softc *, int, int);
  int ugen_get_alt_index(struct ugen_softc *, int);
  void ugen_clear_iface_eps(struct ugen_softc *, struct usbd_interface *);
  
  #define UGENUNIT(n) ((minor(n) >> 4) & 0xf)
  #define UGENENDPOINT(n) (minor(n) & 0xf)
  #define UGENDEV(u, e) (makedev(0, ((u) << 4) | (e)))
  
  int ugen_match(struct device *, void *, void *);
  void ugen_attach(struct device *, struct device *, void *);
  int ugen_detach(struct device *, int);
  
  struct cfdriver ugen_cd = {
  	NULL, "ugen", DV_DULL
  };
  
  const struct cfattach ugen_ca = {
  	sizeof(struct ugen_softc), ugen_match, ugen_attach, ugen_detach
  };
  
  int
  ugen_match(struct device *parent, void *match, void *aux)
  {
  	struct usb_attach_arg *uaa = aux;
  
  	if (uaa->usegeneric) {
  		return (UMATCH_GENERIC);
  	} else
  		return (UMATCH_NONE);
  }
  
  void
  ugen_attach(struct device *parent, struct device *self, void *aux)
  {
  	struct ugen_softc *sc = (struct ugen_softc *)self;
  	struct usb_attach_arg *uaa = aux;
  	struct usbd_device *udev;
  	usbd_status err;
  	int conf;
  
  	sc->sc_udev = udev = uaa->device;
  
  	if (usbd_get_devcnt(udev) > 0)
  		sc->sc_secondary = 1;
  
  	if (!sc->sc_secondary) {
  		/* First set configuration index 0, the default one for ugen. */
  		err = usbd_set_config_index(udev, 0, 0);
  		if (err) {
  			printf("%s: setting configuration index 0 failed\n",
  			       sc->sc_dev.dv_xname);
  			usbd_deactivate(sc->sc_udev);
  			return;
  		}
  	}
  	conf = usbd_get_config_descriptor(udev)->bConfigurationValue;
  
  	/* Set up all the local state for this configuration. */
  	err = ugen_set_config(sc, conf);
  	if (err) {
  		printf("%s: setting configuration %d failed\n",
  		       sc->sc_dev.dv_xname, conf);
  		usbd_deactivate(sc->sc_udev);
  		return;
  	}
  }
  
  int
  ugen_set_config(struct ugen_softc *sc, int configno)
  {
  	struct usbd_device *dev = sc->sc_udev;
  	usb_config_descriptor_t *cdesc;
  	usb_interface_descriptor_t *id;
  	struct usbd_interface *iface;
  	usb_endpoint_descriptor_t *ed;
  	struct ugen_endpoint *sce;
  	int ifaceno, endptno, endpt;
  	int err, dir;
  
  	DPRINTFN(1,("ugen_set_config: %s to configno %d, sc=%p\n",
  		    sc->sc_dev.dv_xname, configno, sc));
  
  	/*
  	 * We start at 1, not 0, because we don't care whether the
  	 * control endpoint is open or not. It is always present.
  	 */
  	for (endptno = 1; endptno < USB_MAX_ENDPOINTS; endptno++)
  		if (sc->sc_is_open[endptno]) {
  			DPRINTFN(1,
  			     ("ugen_set_config: %s - endpoint %d is open\n",
  			      sc->sc_dev.dv_xname, endptno));
  			return (USBD_IN_USE);
  		}
  
  	/* Avoid setting the current value. */
  	cdesc = usbd_get_config_descriptor(dev);
  	if (cdesc == NULL || cdesc->bConfigurationValue != configno) {
  		if (sc->sc_secondary) {
  			printf("%s: secondary, not changing config to %d\n",
  			    __func__, configno);
  			return (USBD_IN_USE);
  		} else {
  			err = usbd_set_config_no(dev, configno, 1);
  			if (err)
  				return (err);
  			cdesc = usbd_get_config_descriptor(dev);
  			if (cdesc == NULL ||
  			    cdesc->bConfigurationValue != configno)
  				return (USBD_INVAL);
  		}
  	}
  
  	memset(sc->sc_endpoints, 0, sizeof sc->sc_endpoints);
  	for (ifaceno = 0; ifaceno < cdesc->bNumInterfaces; ifaceno++) {
  		DPRINTFN(1,("ugen_set_config: ifaceno %d\n", ifaceno));
  		if (usbd_iface_claimed(sc->sc_udev, ifaceno)) {
  			DPRINTF(("%s: iface %d not available\n", __func__,
  			    ifaceno));
  			continue;
  		}
  		err = usbd_device2interface_handle(dev, ifaceno, &iface);
  		if (err)
  			return (err);
  		id = usbd_get_interface_descriptor(iface);
  		for (endptno = 0; endptno < id->bNumEndpoints; endptno++) {
  			ed = usbd_interface2endpoint_descriptor(iface,endptno);
  			endpt = ed->bEndpointAddress;
  			dir = UE_GET_DIR(endpt) == UE_DIR_IN ? IN : OUT;
  			sce = &sc->sc_endpoints[UE_GET_ADDR(endpt)][dir];
  			DPRINTFN(1,("ugen_set_config: endptno %d, endpt=0x%02x"
  				    "(%d,%d), sce=%p\n",
  				    endptno, endpt, UE_GET_ADDR(endpt),
  				    UE_GET_DIR(endpt), sce));
  			sce->sc = sc;
  			sce->edesc = ed;
  			sce->iface = iface;
  		}
  	}
  	return (0);
  }
  
  int
  ugenopen(dev_t dev, int flag, int mode, struct proc *p)
  {
  	struct ugen_softc *sc;
  	int unit = UGENUNIT(dev);
  	int endpt = UGENENDPOINT(dev);
  	usb_endpoint_descriptor_t *edesc;
  	struct ugen_endpoint *sce;
  	int dir, isize;
  	usbd_status err;
  	struct usbd_xfer *xfer;
  	void *buf;
  	int i, j;
  
  	if (unit >= ugen_cd.cd_ndevs)
  		return (ENXIO);
  	sc = ugen_cd.cd_devs[unit];
  	if (sc == NULL)
  		return (ENXIO);
  
  	DPRINTFN(5, ("ugenopen: flag=%d, mode=%d, unit=%d endpt=%d\n",
  		     flag, mode, unit, endpt));
  
  	if (sc == NULL || usbd_is_dying(sc->sc_udev))
  		return (ENXIO);
  
  	if (sc->sc_is_open[endpt])
  		return (EBUSY);
  
  	if (endpt == USB_CONTROL_ENDPOINT) {
  		sc->sc_is_open[USB_CONTROL_ENDPOINT] = 1;
  		return (0);
  	}
  
  	/* Make sure there are pipes for all directions. */
  	for (dir = OUT; dir <= IN; dir++) {
  		if (flag & (dir == OUT ? FWRITE : FREAD)) {
  			sce = &sc->sc_endpoints[endpt][dir];
  			if (sce == 0 || sce->edesc == 0)
  				return (ENXIO);
  		}
  	}
  
  	/* Actually open the pipes. */
  	/* XXX Should back out properly if it fails. */
  	for (dir = OUT; dir <= IN; dir++) {
  		if (!(flag & (dir == OUT ? FWRITE : FREAD)))
  			continue;
  		sce = &sc->sc_endpoints[endpt][dir];
  		sce->state = 0;
  		sce->timeout = USBD_NO_TIMEOUT;
  		DPRINTFN(5, ("ugenopen: sc=%p, endpt=%d, dir=%d, sce=%p\n",
  			     sc, endpt, dir, sce));
  		edesc = sce->edesc;
  		/* Clear device endpoint toggle. */
  		ugen_clear_iface_eps(sc, sce->iface);
  		switch (UE_GET_XFERTYPE(edesc->bmAttributes)) {
  		case UE_INTERRUPT:
  			if (dir == OUT) {
  				err = usbd_open_pipe(sce->iface,
  				    edesc->bEndpointAddress, 0, &sce->pipeh);
  				if (err)
  					return (EIO);
  				break;
  			}
  			isize = UGETW(edesc->wMaxPacketSize);
  			if (isize == 0)	/* shouldn't happen */
  				return (EINVAL);
  			sce->ibuflen = isize;
  			sce->ibuf = malloc(sce->ibuflen, M_USBDEV, M_WAITOK);
  			DPRINTFN(5, ("ugenopen: intr endpt=%d,isize=%d\n",
  				     endpt, isize));
  			clalloc(&sce->q, UGEN_IBSIZE, 0);
  			err = usbd_open_pipe_intr(sce->iface,
  				  edesc->bEndpointAddress,
  				  USBD_SHORT_XFER_OK, &sce->pipeh, sce,
  				  sce->ibuf, isize, ugenintr,
  				  USBD_DEFAULT_INTERVAL);
  			if (err) {
  				free(sce->ibuf, M_USBDEV, sce->ibuflen);
  				clfree(&sce->q);
  				return (EIO);
  			}
  			/* Clear HC endpoint toggle. */
  			usbd_clear_endpoint_toggle(sce->pipeh);
  			DPRINTFN(5, ("ugenopen: interrupt open done\n"));
  			break;
  		case UE_BULK:
  			err = usbd_open_pipe(sce->iface,
  				  edesc->bEndpointAddress, 0, &sce->pipeh);
  			if (err)
  				return (EIO);
  			/* Clear HC endpoint toggle. */
  			usbd_clear_endpoint_toggle(sce->pipeh);
  			break;
  		case UE_ISOCHRONOUS:
  			if (dir == OUT)
  				return (EINVAL);
  			isize = UGETW(edesc->wMaxPacketSize);
  			if (isize == 0)	/* shouldn't happen */
  				return (EINVAL);
  			sce->ibuflen = isize * UGEN_NISOFRAMES;
  			sce->ibuf = mallocarray(isize, UGEN_NISOFRAMES,
  				M_USBDEV, M_WAITOK);
  			sce->cur = sce->fill = sce->ibuf;
  			sce->limit = sce->ibuf + isize * UGEN_NISOFRAMES;
  			DPRINTFN(5, ("ugenopen: isoc endpt=%d, isize=%d\n",
  				     endpt, isize));
  			err = usbd_open_pipe(sce->iface,
  				  edesc->bEndpointAddress, 0, &sce->pipeh);
  			if (err) {
  				free(sce->ibuf, M_USBDEV, sce->ibuflen);
  				return (EIO);
  			}
  			for(i = 0; i < UGEN_NISOREQS; ++i) {
  				sce->isoreqs[i].sce = sce;
  				xfer = usbd_alloc_xfer(sc->sc_udev);
  				if (xfer == 0)
  					goto bad;
  				sce->isoreqs[i].xfer = xfer;
  				buf = usbd_alloc_buffer
  					(xfer, isize * UGEN_NISORFRMS);
  				if (buf == 0) {
  					i++;
  					goto bad;
  				}
  				sce->isoreqs[i].dmabuf = buf;
  				for(j = 0; j < UGEN_NISORFRMS; ++j)
  					sce->isoreqs[i].sizes[j] = isize;
  				usbd_setup_isoc_xfer(xfer, sce->pipeh,
  				    &sce->isoreqs[i], sce->isoreqs[i].sizes,
  				    UGEN_NISORFRMS, USBD_NO_COPY |
  				    USBD_SHORT_XFER_OK, ugen_isoc_rintr);
  				(void)usbd_transfer(xfer);
  			}
  			DPRINTFN(5, ("ugenopen: isoc open done\n"));
  			break;
  		bad:
  			while (--i >= 0) /* implicit buffer free */
  				usbd_free_xfer(sce->isoreqs[i].xfer);
  			return (ENOMEM);
  		case UE_CONTROL:
  			sce->timeout = USBD_DEFAULT_TIMEOUT;
  			return (EINVAL);
  		}
  	}
  	sc->sc_is_open[endpt] = 1;
  	return (0);
  }
  
  int
  ugenclose(dev_t dev, int flag, int mode, struct proc *p)
  {
  	struct ugen_softc *sc = ugen_cd.cd_devs[UGENUNIT(dev)];
  	int endpt = UGENENDPOINT(dev);
  	int error;
  
  	if (sc == NULL || usbd_is_dying(sc->sc_udev))
  		return (EIO);
  
  	DPRINTFN(5, ("ugenclose: flag=%d, mode=%d, unit=%d, endpt=%d\n",
  		     flag, mode, UGENUNIT(dev), endpt));
  
  	sc->sc_refcnt++;
  	error = ugen_do_close(sc, endpt, flag);
  	if (--sc->sc_refcnt < 0)
  		usb_detach_wakeup(&sc->sc_dev);
  
  	return (error);
  }
  
  int
  ugen_do_close(struct ugen_softc *sc, int endpt, int flag)
  {
  	struct ugen_endpoint *sce;
  	int dir, i;
  
  #ifdef DIAGNOSTIC
  	if (!sc->sc_is_open[endpt]) {
  		printf("ugenclose: not open\n");
  		return (EINVAL);
  	}
  #endif
  
  	if (endpt == USB_CONTROL_ENDPOINT) {
  		DPRINTFN(5, ("ugenclose: close control\n"));
  		sc->sc_is_open[endpt] = 0;
  		return (0);
  	}
  
  	for (dir = OUT; dir <= IN; dir++) {
  		if (!(flag & (dir == OUT ? FWRITE : FREAD)))
  			continue;
  		sce = &sc->sc_endpoints[endpt][dir];
  		if (sce == NULL || sce->pipeh == NULL)
  			continue;
  		DPRINTFN(5, ("ugenclose: endpt=%d dir=%d sce=%p\n",
  			     endpt, dir, sce));
  
  		usbd_close_pipe(sce->pipeh);
  		sce->pipeh = NULL;
  
  		switch (UE_GET_XFERTYPE(sce->edesc->bmAttributes)) {
  		case UE_INTERRUPT:
  			ndflush(&sce->q, sce->q.c_cc);
  			clfree(&sce->q);
  			break;
  		case UE_ISOCHRONOUS:
  			for (i = 0; i < UGEN_NISOREQS; ++i)
  				usbd_free_xfer(sce->isoreqs[i].xfer);
  
  		default:
  			break;
  		}
  
  		if (sce->ibuf != NULL) {
  			free(sce->ibuf, M_USBDEV, sce->ibuflen);
  			sce->ibuf = NULL;
  		}
  	}
  	sc->sc_is_open[endpt] = 0;
  
  	return (0);
  }
  
  int
  ugen_do_read(struct ugen_softc *sc, int endpt, struct uio *uio, int flag)
  {
  	struct ugen_endpoint *sce = &sc->sc_endpoints[endpt][IN];
  	u_int32_t tn;
  	size_t n;
  	char buf[UGEN_BBSIZE];
  	struct usbd_xfer *xfer;
  	usbd_status err;
  	int s;
  	int flags, error = 0;
  	u_char buffer[UGEN_CHUNK];
  
  	DPRINTFN(5, ("%s: ugenread: %d\n", sc->sc_dev.dv_xname, endpt));
  
  	if (usbd_is_dying(sc->sc_udev))
  		return (EIO);
  
  	if (endpt == USB_CONTROL_ENDPOINT)
  		return (ENODEV);
  
  #ifdef DIAGNOSTIC
  	if (sce->edesc == NULL) {
  		printf("ugenread: no edesc\n");
  		return (EIO);
  	}
  	if (sce->pipeh == NULL) {
  		printf("ugenread: no pipe\n");
  		return (EIO);
  	}
  #endif
  
  	switch (UE_GET_XFERTYPE(sce->edesc->bmAttributes)) {
  	case UE_INTERRUPT:
  		/* Block until activity occurred. */
  		s = splusb();
  		while (sce->q.c_cc == 0) {
  			if (flag & IO_NDELAY) {
  				splx(s);
  				return (EWOULDBLOCK);
  			}
  			sce->state |= UGEN_ASLP;
  			DPRINTFN(5, ("ugenread: sleep on %p\n", sce));
  			error = tsleep_nsec(sce, PZERO | PCATCH, "ugenrintr",
  			    MSEC_TO_NSEC(sce->timeout));
  			sce->state &= ~UGEN_ASLP;
  			DPRINTFN(5, ("ugenread: woke, error=%d\n", error));
  			if (usbd_is_dying(sc->sc_udev))
  				error = EIO;
  			if (error == EWOULDBLOCK) {	/* timeout, return 0 */
  				error = 0;
  				break;
  			}
  			if (error)
  				break;
  		}
  		splx(s);
  
  		/* Transfer as many chunks as possible. */
  		while (sce->q.c_cc > 0 && uio->uio_resid > 0 && !error) {
  			n = ulmin(sce->q.c_cc, uio->uio_resid);
  			if (n > sizeof(buffer))
  				n = sizeof(buffer);
  
  			/* Remove a small chunk from the input queue. */
  			q_to_b(&sce->q, buffer, n);
  			DPRINTFN(5, ("ugenread: got %zu chars\n", n));
  
  			/* Copy the data to the user process. */
  			error = uiomove(buffer, n, uio);
  			if (error)
  				break;
  		}
  		break;
  	case UE_BULK:
  		xfer = usbd_alloc_xfer(sc->sc_udev);
  		if (xfer == 0)
  			return (ENOMEM);
  		flags = USBD_SYNCHRONOUS;
  		if (sce->state & UGEN_SHORT_OK)
  			flags |= USBD_SHORT_XFER_OK;
  		if (sce->timeout == 0)
  			flags |= USBD_CATCH;
  		while ((n = ulmin(UGEN_BBSIZE, uio->uio_resid)) != 0) {
  			DPRINTFN(1, ("ugenread: start transfer %zu bytes\n",n));
  			usbd_setup_xfer(xfer, sce->pipeh, 0, buf, n,
  			    flags, sce->timeout, NULL);
  			err = usbd_transfer(xfer);
  			if (err) {
  				usbd_clear_endpoint_stall(sce->pipeh);
  				if (err == USBD_INTERRUPTED)
  					error = EINTR;
  				else if (err == USBD_TIMEOUT)
  					error = ETIMEDOUT;
  				else
  					error = EIO;
  				break;
  			}
  			usbd_get_xfer_status(xfer, NULL, NULL, &tn, NULL);
  			DPRINTFN(1, ("ugenread: got %u bytes\n", tn));
  			error = uiomove(buf, tn, uio);
  			if (error || tn < n)
  				break;
  		}
  		usbd_free_xfer(xfer);
  		break;
  	case UE_ISOCHRONOUS:
  		s = splusb();
  		while (sce->cur == sce->fill) {
  			if (flag & IO_NDELAY) {
  				splx(s);
  				return (EWOULDBLOCK);
  			}
  			sce->state |= UGEN_ASLP;
  			DPRINTFN(5, ("ugenread: sleep on %p\n", sce));
  			error = tsleep_nsec(sce, PZERO | PCATCH, "ugenriso",
  			    MSEC_TO_NSEC(sce->timeout));
  			sce->state &= ~UGEN_ASLP;
  			DPRINTFN(5, ("ugenread: woke, error=%d\n", error));
  			if (usbd_is_dying(sc->sc_udev))
  				error = EIO;
  			if (error == EWOULDBLOCK) {	/* timeout, return 0 */
  				error = 0;
  				break;
  			}
  			if (error)
  				break;
  		}
  
  		while (sce->cur != sce->fill && uio->uio_resid > 0 && !error) {
  			if(sce->fill > sce->cur)
  				n = ulmin(sce->fill - sce->cur, uio->uio_resid);
  			else
  				n = ulmin(sce->limit - sce->cur, uio->uio_resid);
  
  			DPRINTFN(5, ("ugenread: isoc got %zu chars\n", n));
  
  			/* Copy the data to the user process. */
  			error = uiomove(sce->cur, n, uio);
  			if (error)
  				break;
  			sce->cur += n;
  			if(sce->cur >= sce->limit)
  				sce->cur = sce->ibuf;
  		}
  		splx(s);
  		break;
  
  
  	default:
  		return (ENXIO);
  	}
  	return (error);
  }
  
  int
  ugenread(dev_t dev, struct uio *uio, int flag)
  {
  	int endpt = UGENENDPOINT(dev);
  	struct ugen_softc *sc;
  	int error;
  
  	sc = ugen_cd.cd_devs[UGENUNIT(dev)];
  
  	sc->sc_refcnt++;
  	error = ugen_do_read(sc, endpt, uio, flag);
  	if (--sc->sc_refcnt < 0)
  		usb_detach_wakeup(&sc->sc_dev);
  	return (error);
  }
  
  int
  ugen_do_write(struct ugen_softc *sc, int endpt, struct uio *uio, int flag)
  {
  	struct ugen_endpoint *sce = &sc->sc_endpoints[endpt][OUT];
  	size_t n;
  	int flags, error = 0;
  	char buf[UGEN_BBSIZE];
  	struct usbd_xfer *xfer;
  	usbd_status err;
  
  	DPRINTFN(5, ("%s: ugenwrite: %d\n", sc->sc_dev.dv_xname, endpt));
  
  	if (usbd_is_dying(sc->sc_udev))
  		return (EIO);
  
  	if (endpt == USB_CONTROL_ENDPOINT)
  		return (ENODEV);
  
  #ifdef DIAGNOSTIC
  	if (sce->edesc == NULL) {
  		printf("ugenwrite: no edesc\n");
  		return (EIO);
  	}
  	if (sce->pipeh == NULL) {
  		printf("ugenwrite: no pipe\n");
  		return (EIO);
  	}
  #endif
  	flags = USBD_SYNCHRONOUS;
  	if (sce->timeout == 0)
  		flags |= USBD_CATCH;
  
  	switch (UE_GET_XFERTYPE(sce->edesc->bmAttributes)) {
  	case UE_BULK:
  		xfer = usbd_alloc_xfer(sc->sc_udev);
  		if (xfer == 0)
  			return (EIO);
  		while ((n = ulmin(UGEN_BBSIZE, uio->uio_resid)) != 0) {
  			error = uiomove(buf, n, uio);
  			if (error)
  				break;
  			DPRINTFN(1, ("ugenwrite: transfer %zu bytes\n", n));
  			usbd_setup_xfer(xfer, sce->pipeh, 0, buf, n,
  			    flags, sce->timeout, NULL);
  			err = usbd_transfer(xfer);
  			if (err) {
  				usbd_clear_endpoint_stall(sce->pipeh);
  				if (err == USBD_INTERRUPTED)
  					error = EINTR;
  				else if (err == USBD_TIMEOUT)
  					error = ETIMEDOUT;
  				else
  					error = EIO;
  				break;
  			}
  		}
  		usbd_free_xfer(xfer);
  		break;
  	case UE_INTERRUPT:
  		xfer = usbd_alloc_xfer(sc->sc_udev);
  		if (xfer == 0)
  			return (EIO);
  		while ((n = ulmin(UGETW(sce->edesc->wMaxPacketSize),
  		    uio->uio_resid)) != 0) {
  			error = uiomove(buf, n, uio);
  			if (error)
  				break;
  			DPRINTFN(1, ("ugenwrite: transfer %zu bytes\n", n));
  			usbd_setup_xfer(xfer, sce->pipeh, 0, buf, n,
  			    flags, sce->timeout, NULL);
  			err = usbd_transfer(xfer);
  			if (err) {
  				usbd_clear_endpoint_stall(sce->pipeh);
  				if (err == USBD_INTERRUPTED)
  					error = EINTR;
  				else if (err == USBD_TIMEOUT)
  					error = ETIMEDOUT;
  				else
  					error = EIO;
  				break;
  			}
  		}
  		usbd_free_xfer(xfer);
  		break;
  	default:
  		return (ENXIO);
  	}
  	return (error);
  }
  
  int
  ugenwrite(dev_t dev, struct uio *uio, int flag)
  {
  	int endpt = UGENENDPOINT(dev);
  	struct ugen_softc *sc;
  	int error;
  
  	sc = ugen_cd.cd_devs[UGENUNIT(dev)];
  
  	sc->sc_refcnt++;
  	error = ugen_do_write(sc, endpt, uio, flag);
  	if (--sc->sc_refcnt < 0)
  		usb_detach_wakeup(&sc->sc_dev);
  	return (error);
  }
  
  int
  ugen_detach(struct device *self, int flags)
  {
  	struct ugen_softc *sc = (struct ugen_softc *)self;
  	struct ugen_endpoint *sce;
  	int i, dir, endptno;
  	int s, maj, mn;
  
  	DPRINTF(("ugen_detach: sc=%p flags=%d\n", sc, flags));
  
  	/* Abort all pipes.  Causes processes waiting for transfer to wake. */
  	for (i = 0; i < USB_MAX_ENDPOINTS; i++) {
  		for (dir = OUT; dir <= IN; dir++) {
  			sce = &sc->sc_endpoints[i][dir];
  			if (sce && sce->pipeh)
  				usbd_abort_pipe(sce->pipeh);
  		}
  	}
  
  	s = splusb();
  	if (--sc->sc_refcnt >= 0) {
  		/* Wake everyone */
  		for (i = 0; i < USB_MAX_ENDPOINTS; i++)
  			wakeup(&sc->sc_endpoints[i][IN]);
  		/* Wait for processes to go away. */
  		usb_detach_wait(&sc->sc_dev);
  	}
  	splx(s);
  
  	/* locate the major number */
  	for (maj = 0; maj < nchrdev; maj++)
  		if (cdevsw[maj].d_open == ugenopen)
  			break;
  
  	/* Nuke the vnodes for any open instances (calls close). */
  	mn = self->dv_unit * USB_MAX_ENDPOINTS;
  	vdevgone(maj, mn, mn + USB_MAX_ENDPOINTS - 1, VCHR);
  
  	for (endptno = 0; endptno < USB_MAX_ENDPOINTS; endptno++) {
  		if (sc->sc_is_open[endptno])
  			ugen_do_close(sc, endptno, FREAD|FWRITE);
  
  		/* ugenkqfilter() always uses IN. */
  		sce = &sc->sc_endpoints[endptno][IN];
  		klist_invalidate(&sce->rsel.si_note);
  	}
  	return (0);
  }
  
  void
  ugenintr(struct usbd_xfer *xfer, void *addr, usbd_status status)
  {
  	struct ugen_endpoint *sce = addr;
  	/*struct ugen_softc *sc = sce->sc;*/
  	u_int32_t count;
  	u_char *ibuf;
  
  	if (status == USBD_CANCELLED)
  		return;
  
  	if (status != USBD_NORMAL_COMPLETION) {
  		DPRINTF(("ugenintr: status=%d\n", status));
  		if (status == USBD_STALLED)
  			usbd_clear_endpoint_stall_async(sce->pipeh);
  		return;
  	}
  
  	usbd_get_xfer_status(xfer, NULL, NULL, &count, NULL);
  	ibuf = sce->ibuf;
  
  	DPRINTFN(5, ("ugenintr: xfer=%p status=%d count=%d\n",
  		     xfer, status, count));
  	DPRINTFN(5, ("          data = %02x %02x %02x\n",
  		     ibuf[0], ibuf[1], ibuf[2]));
  
  	(void)b_to_q(ibuf, count, &sce->q);
  
  	if (sce->state & UGEN_ASLP) {
  		sce->state &= ~UGEN_ASLP;
  		DPRINTFN(5, ("ugen_intr: waking %p\n", sce));
  		wakeup(sce);
  	}
  	selwakeup(&sce->rsel);
  }
  
  void
  ugen_isoc_rintr(struct usbd_xfer *xfer, void *addr, usbd_status status)
  {
  	struct isoreq *req = addr;
  	struct ugen_endpoint *sce = req->sce;
  	u_int32_t count, n;
  	int i, isize;
  
  	/* Return if we are aborting. */
  	if (status == USBD_CANCELLED)
  		return;
  
  	usbd_get_xfer_status(xfer, NULL, NULL, &count, NULL);
  	DPRINTFN(5,("%s: xfer %ld, count=%d\n", __func__, req - sce->isoreqs,
  	    count));
  
  	/* throw away oldest input if the buffer is full */
  	if(sce->fill < sce->cur && sce->cur <= sce->fill + count) {
  		sce->cur += count;
  		if(sce->cur >= sce->limit)
  			sce->cur = sce->ibuf + (sce->limit - sce->cur);
  		DPRINTFN(5, ("%s: throwing away %d bytes\n", __func__, count));
  	}
  
  	isize = UGETW(sce->edesc->wMaxPacketSize);
  	for (i = 0; i < UGEN_NISORFRMS; i++) {
  		u_int32_t actlen = req->sizes[i];
  		char const *buf = (char const *)req->dmabuf + isize * i;
  
  		/* copy data to buffer */
  		while (actlen > 0) {
  			n = min(actlen, sce->limit - sce->fill);
  			memcpy(sce->fill, buf, n);
  
  			buf += n;
  			actlen -= n;
  			sce->fill += n;
  			if(sce->fill == sce->limit)
  				sce->fill = sce->ibuf;
  		}
  
  		/* setup size for next transfer */
  		req->sizes[i] = isize;
  	}
  
  	usbd_setup_isoc_xfer(xfer, sce->pipeh, req, req->sizes, UGEN_NISORFRMS,
  	    USBD_NO_COPY | USBD_SHORT_XFER_OK, ugen_isoc_rintr);
  	(void)usbd_transfer(xfer);
  
  	if (sce->state & UGEN_ASLP) {
  		sce->state &= ~UGEN_ASLP;
  		DPRINTFN(5, ("ugen_isoc_rintr: waking %p\n", sce));
  		wakeup(sce);
  	}
  	selwakeup(&sce->rsel);
  }
  
  int 
  ugen_set_interface(struct ugen_softc *sc, int ifaceno, int altno)
  {
  	struct usbd_interface *iface;
  	usb_config_descriptor_t *cdesc;
  	usb_interface_descriptor_t *id;
  	usb_endpoint_descriptor_t *ed;
  	struct ugen_endpoint *sce;
  	uint8_t  endptno, endpt;
  	int dir, err;
  
  	DPRINTFN(15, ("ugen_set_interface %d %d\n", ifaceno, altno));
  
  	cdesc = usbd_get_config_descriptor(sc->sc_udev);
  	if (ifaceno < 0 || ifaceno >= cdesc->bNumInterfaces ||
  	    usbd_iface_claimed(sc->sc_udev, ifaceno))
  		return (USBD_INVAL);
  
  	err = usbd_device2interface_handle(sc->sc_udev, ifaceno, &iface);
  	if (err)
  		return (err);
  	id = usbd_get_interface_descriptor(iface);
  	for (endptno = 0; endptno < id->bNumEndpoints; endptno++) {
  		ed = usbd_interface2endpoint_descriptor(iface,endptno);
  		endpt = ed->bEndpointAddress;
  		dir = UE_GET_DIR(endpt) == UE_DIR_IN ? IN : OUT;
  		sce = &sc->sc_endpoints[UE_GET_ADDR(endpt)][dir];
  		sce->sc = 0;
  		sce->edesc = 0;
  		sce->iface = 0;
  	}
  
  	/* Try to change setting, if this fails put back the descriptors. */
  	err = usbd_set_interface(iface, altno);
  
  	id = usbd_get_interface_descriptor(iface);
  	for (endptno = 0; endptno < id->bNumEndpoints; endptno++) {
  		ed = usbd_interface2endpoint_descriptor(iface,endptno);
  		endpt = ed->bEndpointAddress;
  		dir = UE_GET_DIR(endpt) == UE_DIR_IN ? IN : OUT;
  		sce = &sc->sc_endpoints[UE_GET_ADDR(endpt)][dir];
  		sce->sc = sc;
  		sce->edesc = ed;
  		sce->iface = iface;
  	}
  	return (err);
  }
  
  int
  ugen_get_alt_index(struct ugen_softc *sc, int ifaceno)
  {
  	struct usbd_interface *iface;
  	usbd_status err;
  
  	err = usbd_device2interface_handle(sc->sc_udev, ifaceno, &iface);
  	if (err)
  		return (-1);
  	return (usbd_get_interface_altindex(iface));
  }
  
  int
  ugen_do_ioctl(struct ugen_softc *sc, int endpt, u_long cmd, caddr_t addr,
      int flag, struct proc *p)
  {
  	struct ugen_endpoint *sce;
  	int err, cdesc_len;
  	struct usbd_interface *iface;
  	struct usb_config_desc *cd;
  	usb_config_descriptor_t *cdesc;
  	struct usb_interface_desc *id;
  	usb_interface_descriptor_t *idesc;
  	struct usb_endpoint_desc *ed;
  	usb_endpoint_descriptor_t *edesc;
  	struct usb_alt_interface *ai;
  	u_int8_t conf, alt;
  
  	DPRINTFN(5, ("ugenioctl: cmd=%08lx\n", cmd));
  	if (usbd_is_dying(sc->sc_udev))
  		return (EIO);
  
  	switch (cmd) {
  	case USB_SET_SHORT_XFER:
  		if (endpt == USB_CONTROL_ENDPOINT)
  			return (EINVAL);
  		/* This flag only affects read */
  		sce = &sc->sc_endpoints[endpt][IN];
  		if (sce == NULL || sce->pipeh == NULL)
  			return (EINVAL);
  		if (*(int *)addr)
  			sce->state |= UGEN_SHORT_OK;
  		else
  			sce->state &= ~UGEN_SHORT_OK;
  		return (0);
  	case USB_SET_TIMEOUT:
  		sce = &sc->sc_endpoints[endpt][IN];
  		if (sce == NULL)
  			return (EINVAL);
  		sce->timeout = *(int *)addr;
  		sce = &sc->sc_endpoints[endpt][OUT];
  		if (sce == NULL)
  			return (EINVAL);
  		sce->timeout = *(int *)addr;
  		return (0);
  	default:
  		break;
  	}
  
  	if (endpt != USB_CONTROL_ENDPOINT)
  		return (EINVAL);
  
  	switch (cmd) {
  #ifdef UGEN_DEBUG
  	case USB_SETDEBUG:
  		ugendebug = *(int *)addr;
  		break;
  #endif
  	case USB_GET_CONFIG:
  		err = usbd_get_config(sc->sc_udev, &conf);
  		if (err)
  			return (EIO);
  		*(int *)addr = conf;
  		break;
  	case USB_SET_CONFIG:
  		if (!(flag & FWRITE))
  			return (EPERM);
  		err = ugen_set_config(sc, *(int *)addr);
  		switch (err) {
  		case USBD_NORMAL_COMPLETION:
  			break;
  		case USBD_IN_USE:
  			return (EBUSY);
  		default:
  			return (EIO);
  		}
  		break;
  	case USB_GET_ALTINTERFACE:
  		ai = (struct usb_alt_interface *)addr;
  		err = usbd_device2interface_handle(sc->sc_udev,
  			  ai->uai_interface_index, &iface);
  		if (err)
  			return (EINVAL);
  		idesc = usbd_get_interface_descriptor(iface);
  		if (idesc == NULL)
  			return (EIO);
  		ai->uai_alt_no = idesc->bAlternateSetting;
  		break;
  	case USB_SET_ALTINTERFACE:
  		if (!(flag & FWRITE))
  			return (EPERM);
  		ai = (struct usb_alt_interface *)addr;
  		err = usbd_device2interface_handle(sc->sc_udev,
  			  ai->uai_interface_index, &iface);
  		if (err)
  			return (EINVAL);
  		err = ugen_set_interface(sc, ai->uai_interface_index,
  		    ai->uai_alt_no);
  		if (err)
  			return (EINVAL);
  		break;
  	case USB_GET_NO_ALT:
  		ai = (struct usb_alt_interface *)addr;
  		cdesc = usbd_get_cdesc(sc->sc_udev, ai->uai_config_index,
  		    &cdesc_len);
  		if (cdesc == NULL)
  			return (EINVAL);
  		idesc = usbd_find_idesc(cdesc, ai->uai_interface_index, 0);
  		if (idesc == NULL) {
  			free(cdesc, M_TEMP, UGETW(cdesc->wTotalLength));
  			return (EINVAL);
  		}
  		ai->uai_alt_no = usbd_get_no_alts(cdesc,
  		    idesc->bInterfaceNumber);
  		free(cdesc, M_TEMP, cdesc_len);
  		break;
  	case USB_GET_DEVICE_DESC:
  		*(usb_device_descriptor_t *)addr =
  			*usbd_get_device_descriptor(sc->sc_udev);
  		break;
  	case USB_GET_CONFIG_DESC:
  		cd = (struct usb_config_desc *)addr;
  		cdesc = usbd_get_cdesc(sc->sc_udev, cd->ucd_config_index,
  		    &cdesc_len);
  		if (cdesc == NULL)
  			return (EINVAL);
  		cd->ucd_desc = *cdesc;
  		free(cdesc, M_TEMP, cdesc_len);
  		break;
  	case USB_GET_INTERFACE_DESC:
  		id = (struct usb_interface_desc *)addr;
  		cdesc = usbd_get_cdesc(sc->sc_udev, id->uid_config_index,
  		    &cdesc_len);
  		if (cdesc == NULL)
  			return (EINVAL);
  		if (id->uid_config_index == USB_CURRENT_CONFIG_INDEX &&
  		    id->uid_alt_index == USB_CURRENT_ALT_INDEX)
  			alt = ugen_get_alt_index(sc, id->uid_interface_index);
  		else
  			alt = id->uid_alt_index;
  		idesc = usbd_find_idesc(cdesc, id->uid_interface_index, alt);
  		if (idesc == NULL) {
  			free(cdesc, M_TEMP, UGETW(cdesc->wTotalLength));
  			return (EINVAL);
  		}
  		id->uid_desc = *idesc;
  		free(cdesc, M_TEMP, cdesc_len);
  		break;
  	case USB_GET_ENDPOINT_DESC:
  		ed = (struct usb_endpoint_desc *)addr;
  		cdesc = usbd_get_cdesc(sc->sc_udev, ed->ued_config_index,
  		    &cdesc_len);
  		if (cdesc == NULL)
  			return (EINVAL);
  		if (ed->ued_config_index == USB_CURRENT_CONFIG_INDEX &&
  		    ed->ued_alt_index == USB_CURRENT_ALT_INDEX)
  			alt = ugen_get_alt_index(sc, ed->ued_interface_index);
  		else
  			alt = ed->ued_alt_index;
  		edesc = usbd_find_edesc(cdesc, ed->ued_interface_index,
  					alt, ed->ued_endpoint_index);
  		if (edesc == NULL) {
  			free(cdesc, M_TEMP, UGETW(cdesc->wTotalLength));
  			return (EINVAL);
  		}
  		ed->ued_desc = *edesc;
  		free(cdesc, M_TEMP, cdesc_len);
  		break;
  	case USB_GET_FULL_DESC:
  	{
  		u_int len;
  		struct iovec iov;
  		struct uio uio;
  		struct usb_full_desc *fd = (struct usb_full_desc *)addr;
  		int error;
  
  		cdesc = usbd_get_cdesc(sc->sc_udev, fd->ufd_config_index,
  		    &cdesc_len);
  		if (cdesc == NULL)
  			return (EINVAL);
  		len = cdesc_len;
  		if (len > fd->ufd_size)
  			len = fd->ufd_size;
  		iov.iov_base = (caddr_t)fd->ufd_data;
  		iov.iov_len = len;
  		uio.uio_iov = &iov;
  		uio.uio_iovcnt = 1;
  		uio.uio_resid = len;
  		uio.uio_offset = 0;
  		uio.uio_segflg = UIO_USERSPACE;
  		uio.uio_rw = UIO_READ;
  		uio.uio_procp = p;
  		error = uiomove((void *)cdesc, len, &uio);
  		free(cdesc, M_TEMP, cdesc_len);
  		return (error);
  	}
  	case USB_DO_REQUEST:
  	{
  		struct usb_ctl_request *ur = (void *)addr;
  		size_t len = UGETW(ur->ucr_request.wLength), mlen;
  		struct iovec iov;
  		struct uio uio;
  		void *ptr = NULL;
  		int error = 0;
  
  		if (!(flag & FWRITE))
  			return (EPERM);
  		/* Avoid requests that would damage the bus integrity. */
  		if ((ur->ucr_request.bmRequestType == UT_WRITE_DEVICE &&
  		     ur->ucr_request.bRequest == UR_SET_ADDRESS) ||
  		    (ur->ucr_request.bmRequestType == UT_WRITE_DEVICE &&
  		     ur->ucr_request.bRequest == UR_SET_CONFIG) ||
  		    (ur->ucr_request.bmRequestType == UT_WRITE_INTERFACE &&
  		     ur->ucr_request.bRequest == UR_SET_INTERFACE))
  			return (EINVAL);
  
  		if (len > 32767)
  			return (EINVAL);
  		if (len != 0) {
  			iov.iov_base = (caddr_t)ur->ucr_data;
  			iov.iov_len = len;
  			uio.uio_iov = &iov;
  			uio.uio_iovcnt = 1;
  			uio.uio_resid = len;
  			uio.uio_offset = 0;
  			uio.uio_segflg = UIO_USERSPACE;
  			uio.uio_rw =
  				ur->ucr_request.bmRequestType & UT_READ ?
  				UIO_READ : UIO_WRITE;
  			uio.uio_procp = p;
  			if ((ptr = malloc(len, M_TEMP, M_NOWAIT)) == NULL) {
  				error = ENOMEM;
  				goto ret;
  			}
  			if (uio.uio_rw == UIO_WRITE) {
  				error = uiomove(ptr, len, &uio);
  				if (error)
  					goto ret;
  			}
  		}
  		sce = &sc->sc_endpoints[endpt][IN];
  		err = usbd_do_request_flags(sc->sc_udev, &ur->ucr_request,
  			  ptr, ur->ucr_flags, &ur->ucr_actlen, sce->timeout);
  		if (err) {
  			error = EIO;
  			goto ret;
  		}
  		/* Only if USBD_SHORT_XFER_OK is set. */
  		mlen = len;
  		if (mlen > ur->ucr_actlen)
  			mlen = ur->ucr_actlen;
  		if (mlen != 0) {
  			if (uio.uio_rw == UIO_READ) {
  				error = uiomove(ptr, mlen, &uio);
  				if (error)
  					goto ret;
  			}
  		}
  	ret:
  		free(ptr, M_TEMP, len);
  		return (error);
  	}
  	case USB_GET_DEVICEINFO:
  		usbd_fill_deviceinfo(sc->sc_udev,
  				     (struct usb_device_info *)addr);
  		break;
  	default:
  		return (EINVAL);
  	}
  	return (0);
  }
  
  int
  ugenioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct proc *p)
  {
  	int endpt = UGENENDPOINT(dev);
  	struct ugen_softc *sc;
  	int error;
  
  	sc = ugen_cd.cd_devs[UGENUNIT(dev)];
  
  	sc->sc_refcnt++;
  	error = ugen_do_ioctl(sc, endpt, cmd, addr, flag, p);
  	if (--sc->sc_refcnt < 0)
  		usb_detach_wakeup(&sc->sc_dev);
  	return (error);
  }
  
  void filt_ugenrdetach(struct knote *);
  int filt_ugenread_intr(struct knote *, long);
  int filt_ugenread_isoc(struct knote *, long);
  int ugenkqfilter(dev_t, struct knote *);
  
  void
  filt_ugenrdetach(struct knote *kn)
  {
  	struct ugen_endpoint *sce = (void *)kn->kn_hook;
  	int s;
  
  	s = splusb();
  	klist_remove_locked(&sce->rsel.si_note, kn);
  	splx(s);
  }
  
  int
  filt_ugenread_intr(struct knote *kn, long hint)
  {
  	struct ugen_endpoint *sce = (void *)kn->kn_hook;
  
  	kn->kn_data = sce->q.c_cc;
  	return (kn->kn_data > 0);
  }
  
  int
  filt_ugenread_isoc(struct knote *kn, long hint)
  {
  	struct ugen_endpoint *sce = (void *)kn->kn_hook;
  
  	if (sce->cur == sce->fill)
  		return (0);
  
  	if (sce->cur < sce->fill)
  		kn->kn_data = sce->fill - sce->cur;
  	else
  		kn->kn_data = (sce->limit - sce->cur) +
  		    (sce->fill - sce->ibuf);
  
  	return (1);
  }
  
  const struct filterops ugenread_intr_filtops = {
  	.f_flags	= FILTEROP_ISFD,
  	.f_attach	= NULL,
  	.f_detach	= filt_ugenrdetach,
  	.f_event	= filt_ugenread_intr,
  };
  
  const struct filterops ugenread_isoc_filtops = {
  	.f_flags	= FILTEROP_ISFD,
  	.f_attach	= NULL,
  	.f_detach	= filt_ugenrdetach,
  	.f_event	= filt_ugenread_isoc,
  };
  
  int
  ugenkqfilter(dev_t dev, struct knote *kn)
  {
  	struct ugen_softc *sc;
  	struct ugen_endpoint *sce;
  	struct klist *klist;
  	int s;
  
  	sc = ugen_cd.cd_devs[UGENUNIT(dev)];
  
  	if (usbd_is_dying(sc->sc_udev))
  		return (ENXIO);
  
  	/* XXX always IN */
  	sce = &sc->sc_endpoints[UGENENDPOINT(dev)][IN];
  	if (sce == NULL)
  		return (ENXIO);
  
  	switch (kn->kn_filter) {
  	case EVFILT_READ:
  		klist = &sce->rsel.si_note;
  		switch (UE_GET_XFERTYPE(sce->edesc->bmAttributes)) {
  		case UE_INTERRUPT:
  			kn->kn_fop = &ugenread_intr_filtops;
  			break;
  		case UE_ISOCHRONOUS:
  			kn->kn_fop = &ugenread_isoc_filtops;
  			break;
  		case UE_BULK:
  			/*
  			 * We have no easy way of determining if a read will
  			 * yield any data or a write will happen.
  			 */
  			return (seltrue_kqfilter(dev, kn));
  		default:
  			return (EINVAL);
  		}
  		break;
  
  	case EVFILT_WRITE:
  		klist = &sce->rsel.si_note;
  		switch (UE_GET_XFERTYPE(sce->edesc->bmAttributes)) {
  		case UE_INTERRUPT:
  		case UE_ISOCHRONOUS:
  			/* XXX poll doesn't support this */
  			return (EINVAL);
  
  		case UE_BULK:
  			/*
  			 * We have no easy way of determining if a read will
  			 * yield any data or a write will happen.
  			 */
  			return (seltrue_kqfilter(dev, kn));
  		default:
  			return (EINVAL);
  		}
  		break;
  
  	default:
  		return (EINVAL);
  	}
  
  	kn->kn_hook = (void *)sce;
  
  	s = splusb();
  	klist_insert_locked(klist, kn);
  	splx(s);
  
  	return (0);
  }
  
  void
  ugen_clear_iface_eps(struct ugen_softc *sc, struct usbd_interface *iface)
  {
  	usb_interface_descriptor_t *id;
  	usb_endpoint_descriptor_t *ed;
  	uint8_t xfertype;
  	int i;
  
  	/* Only clear interface endpoints when none are in use. */
  	for (i = 0; i < USB_MAX_ENDPOINTS; i++) {
  		if (i == USB_CONTROL_ENDPOINT)
  			continue;
  		if (sc->sc_is_open[i] != 0)
  			return;
  	}
  	DPRINTFN(1,("%s: clear interface eps\n", __func__));
  
  	id = usbd_get_interface_descriptor(iface);
  	if (id == NULL)
  		goto bad;
  
  	for (i = 0; i < id->bNumEndpoints; i++) {
  		ed = usbd_interface2endpoint_descriptor(iface, i);
  		if (ed == NULL)
  			goto bad;
  
  		xfertype = UE_GET_XFERTYPE(ed->bmAttributes);
  		if (xfertype == UE_BULK || xfertype == UE_INTERRUPT) {
  			if (usbd_clear_endpoint_feature(sc->sc_udev,
  			    ed->bEndpointAddress, UF_ENDPOINT_HALT))
  				goto bad;
  		}
  	}
  	return;
  bad:
  	printf("%s: clear endpoints failed!\n", __func__);
  }