freebsd-dev/sys/dev/usb/uscanner.c

/*	$NetBSD: uscanner.c,v 1.30 2002/07/11 21:14:36 augustss Exp$	*/

/* Also already merged from NetBSD:
 *	$NetBSD: uscanner.c,v 1.33 2002/09/23 05:51:24 simonb Exp $
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*-
 * Copyright (c) 2000 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
 * and Nick Hibma (n_hibma@qubesoft.com).
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 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/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/filio.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/selinfo.h>
#include <sys/proc.h>
#include <sys/poll.h>
#include <sys/conf.h>
#include <sys/sysctl.h>
#include <sys/uio.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>

#include "usbdevs.h"

#ifdef USB_DEBUG
#define DPRINTF(x)	if (uscannerdebug) printf x
#define DPRINTFN(n,x)	if (uscannerdebug>(n)) printf x
int	uscannerdebug = 0;
SYSCTL_NODE(_hw_usb, OID_AUTO, uscanner, CTLFLAG_RW, 0, "USB uscanner");
SYSCTL_INT(_hw_usb_uscanner, OID_AUTO, debug, CTLFLAG_RW,
	   &uscannerdebug, 0, "uscanner debug level");
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

struct uscan_info {
	struct usb_devno devno;
	u_int flags;
#define USC_KEEP_OPEN 1
};

/* Table of scanners that may work with this driver. */
static const struct uscan_info uscanner_devs[] = {
  /* Acer Peripherals */
 {{ USB_VENDOR_ACERP, USB_PRODUCT_ACERP_ACERSCAN_320U }, 0 },
 {{ USB_VENDOR_ACERP, USB_PRODUCT_ACERP_ACERSCAN_4300U }, 0 },
 {{ USB_VENDOR_ACERP, USB_PRODUCT_ACERP_ACERSCAN_640U }, 0 },
 {{ USB_VENDOR_ACERP, USB_PRODUCT_ACERP_ACERSCAN_640BT }, 0 },
 {{ USB_VENDOR_ACERP, USB_PRODUCT_ACERP_ACERSCAN_620U }, 0 },
 {{ USB_VENDOR_ACERP, USB_PRODUCT_ACERP_ACERSCAN_1240U }, 0 },
 {{ USB_VENDOR_ACERP, USB_PRODUCT_ACERP_ACERSCAN_C310U }, 0 },

  /* AGFA */
 {{ USB_VENDOR_AGFA, USB_PRODUCT_AGFA_SNAPSCAN1236U }, 0 },
 {{ USB_VENDOR_AGFA, USB_PRODUCT_AGFA_SNAPSCAN1212U }, 0 },
 {{ USB_VENDOR_AGFA, USB_PRODUCT_AGFA_SNAPSCAN1212U2 }, 0 },
 {{ USB_VENDOR_AGFA, USB_PRODUCT_AGFA_SNAPSCANTOUCH }, 0 },
 {{ USB_VENDOR_AGFA, USB_PRODUCT_AGFA_SNAPSCANE40 }, 0 },
 {{ USB_VENDOR_AGFA, USB_PRODUCT_AGFA_SNAPSCANE50 }, 0 },
 {{ USB_VENDOR_AGFA, USB_PRODUCT_AGFA_SNAPSCANE20 }, 0 },
 {{ USB_VENDOR_AGFA, USB_PRODUCT_AGFA_SNAPSCANE25 }, 0 },
 {{ USB_VENDOR_AGFA, USB_PRODUCT_AGFA_SNAPSCANE26 }, 0 },
 {{ USB_VENDOR_AGFA, USB_PRODUCT_AGFA_SNAPSCANE52 }, 0 },

  /* Avision */
 {{ USB_VENDOR_AVISION, USB_PRODUCT_AVISION_1200U }, 0 },

  /* Canon */
 {{ USB_VENDOR_CANON, USB_PRODUCT_CANON_N656U }, 0 },
 {{ USB_VENDOR_CANON, USB_PRODUCT_CANON_N676U }, 0 },
 {{ USB_VENDOR_CANON, USB_PRODUCT_CANON_N1220U }, 0 },
 {{ USB_VENDOR_CANON, USB_PRODUCT_CANON_D660U }, 0 },
 {{ USB_VENDOR_CANON, USB_PRODUCT_CANON_N1240U }, 0 },
 {{ USB_VENDOR_CANON, USB_PRODUCT_CANON_LIDE25 }, 0 },

  /* Kye */
 {{ USB_VENDOR_KYE, USB_PRODUCT_KYE_VIVIDPRO }, 0 },

  /* HP */
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_2200C }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_3300C }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_3400CSE }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_4100C }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_4200C }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_4300C }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_4670V }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_S20 }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_5200C }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_5300C }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_5400C }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_6200C }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_6300C }, 0 },
 {{ USB_VENDOR_HP, USB_PRODUCT_HP_82x0C }, 0 },

  /* Microtek */
 {{ USB_VENDOR_SCANLOGIC, USB_PRODUCT_SCANLOGIC_336CX }, 0 },
 {{ USB_VENDOR_MICROTEK, USB_PRODUCT_MICROTEK_X6U }, 0 },
 {{ USB_VENDOR_MICROTEK, USB_PRODUCT_MICROTEK_336CX }, 0 },
 {{ USB_VENDOR_MICROTEK, USB_PRODUCT_MICROTEK_336CX2 }, 0 },
 {{ USB_VENDOR_MICROTEK, USB_PRODUCT_MICROTEK_C6 }, 0 },
 {{ USB_VENDOR_MICROTEK, USB_PRODUCT_MICROTEK_V6USL }, 0 },
 {{ USB_VENDOR_MICROTEK, USB_PRODUCT_MICROTEK_V6USL2 }, 0 },
 {{ USB_VENDOR_MICROTEK, USB_PRODUCT_MICROTEK_V6UL }, 0 },

 /* Minolta */
 {{ USB_VENDOR_MINOLTA, USB_PRODUCT_MINOLTA_5400 }, 0 },

  /* Mustek */
 {{ USB_VENDOR_MUSTEK, USB_PRODUCT_MUSTEK_1200CU }, 0 },
 {{ USB_VENDOR_MUSTEK, USB_PRODUCT_MUSTEK_BEARPAW1200F }, 0 },
 {{ USB_VENDOR_MUSTEK, USB_PRODUCT_MUSTEK_BEARPAW1200TA }, 0 },
 {{ USB_VENDOR_MUSTEK, USB_PRODUCT_MUSTEK_600USB }, 0 },
 {{ USB_VENDOR_MUSTEK, USB_PRODUCT_MUSTEK_600CU }, 0 },
 {{ USB_VENDOR_MUSTEK, USB_PRODUCT_MUSTEK_1200USB }, 0 },
 {{ USB_VENDOR_MUSTEK, USB_PRODUCT_MUSTEK_1200UB }, 0 },
 {{ USB_VENDOR_MUSTEK, USB_PRODUCT_MUSTEK_1200USBPLUS }, 0 },
 {{ USB_VENDOR_MUSTEK, USB_PRODUCT_MUSTEK_1200CUPLUS }, 0 },

  /* National */
 {{ USB_VENDOR_NATIONAL, USB_PRODUCT_NATIONAL_BEARPAW1200 }, 0 },
 {{ USB_VENDOR_NATIONAL, USB_PRODUCT_NATIONAL_BEARPAW2400 }, 0 },

  /* Nikon */
 {{ USB_VENDOR_NIKON, USB_PRODUCT_NIKON_LS40 }, 0 },

  /* Primax */
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_G2X300 }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_G2E300 }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_G2300 }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_G2E3002 }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_9600 }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_600U }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_6200 }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_19200 }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_1200U }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_G600 }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_636I }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_G2600 }, 0 },
 {{ USB_VENDOR_PRIMAX, USB_PRODUCT_PRIMAX_G2E600 }, 0 },

  /* Epson */
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_636 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_610 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_1200 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_1240 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_1250 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_1600 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_1640 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_640U }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_1650 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_1660 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_1670 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_1260 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_1270 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_RX425 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_3200 }, USC_KEEP_OPEN },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_GT9700F }, USC_KEEP_OPEN },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_GT9300UF }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_2480 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_3500 }, USC_KEEP_OPEN },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_3590 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_4200 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_4800 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_4990 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_5000 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_6000 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_CX5400 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_DX7400 }, 0 },
 {{ USB_VENDOR_EPSON, USB_PRODUCT_EPSON_DX8400 }, 0 },

  /* UMAX */
 {{ USB_VENDOR_UMAX, USB_PRODUCT_UMAX_ASTRA1220U }, 0 },
 {{ USB_VENDOR_UMAX, USB_PRODUCT_UMAX_ASTRA1236U }, 0 },
 {{ USB_VENDOR_UMAX, USB_PRODUCT_UMAX_ASTRA2000U }, 0 },
 {{ USB_VENDOR_UMAX, USB_PRODUCT_UMAX_ASTRA2100U }, 0 },
 {{ USB_VENDOR_UMAX, USB_PRODUCT_UMAX_ASTRA2200U }, 0 },
 {{ USB_VENDOR_UMAX, USB_PRODUCT_UMAX_ASTRA3400 }, 0 },

  /* Visioneer */
 {{ USB_VENDOR_VISIONEER, USB_PRODUCT_VISIONEER_3000 }, 0 },
 {{ USB_VENDOR_VISIONEER, USB_PRODUCT_VISIONEER_5300 }, 0 },
 {{ USB_VENDOR_VISIONEER, USB_PRODUCT_VISIONEER_7600 }, 0 },
 {{ USB_VENDOR_VISIONEER, USB_PRODUCT_VISIONEER_6100 }, 0 },
 {{ USB_VENDOR_VISIONEER, USB_PRODUCT_VISIONEER_6200 }, 0 },
 {{ USB_VENDOR_VISIONEER, USB_PRODUCT_VISIONEER_8100 }, 0 },
 {{ USB_VENDOR_VISIONEER, USB_PRODUCT_VISIONEER_8600 }, 0 },

  /* Ultima */
 {{ USB_VENDOR_ULTIMA, USB_PRODUCT_ULTIMA_1200UBPLUS }, 0 },

};
#define uscanner_lookup(v, p) ((const struct uscan_info *)usb_lookup(uscanner_devs, v, p))

#define	USCANNER_BUFFERSIZE	1024

struct uscanner_softc {
	device_t		sc_dev;		/* base device */
	usbd_device_handle	sc_udev;
	usbd_interface_handle	sc_iface;
	struct cdev *dev;

	u_int			sc_dev_flags;

	usbd_pipe_handle	sc_bulkin_pipe;
	int			sc_bulkin;
	usbd_xfer_handle	sc_bulkin_xfer;
	void 			*sc_bulkin_buffer;
	int			sc_bulkin_bufferlen;
	int			sc_bulkin_datalen;

	usbd_pipe_handle	sc_bulkout_pipe;
	int			sc_bulkout;
	usbd_xfer_handle	sc_bulkout_xfer;
	void 			*sc_bulkout_buffer;
	int			sc_bulkout_bufferlen;
	int			sc_bulkout_datalen;

	u_char			sc_state;
#define USCANNER_OPEN		0x01	/* opened */

	int			sc_refcnt;
	u_char			sc_dying;
};

d_open_t  uscanneropen;
d_close_t uscannerclose;
d_read_t  uscannerread;
d_write_t uscannerwrite;
d_poll_t  uscannerpoll;


static struct cdevsw uscanner_cdevsw = {
	.d_version =	D_VERSION,
	.d_flags =	D_NEEDGIANT,
	.d_open =	uscanneropen,
	.d_close =	uscannerclose,
	.d_read =	uscannerread,
	.d_write =	uscannerwrite,
	.d_poll =	uscannerpoll,
	.d_name =	"uscanner",
};

static int uscanner_do_read(struct uscanner_softc *, struct uio *, int);
static int uscanner_do_write(struct uscanner_softc *, struct uio *, int);
static void uscanner_do_close(struct uscanner_softc *);

#define USCANNERUNIT(n) (minor(n))

static device_probe_t uscanner_match;
static device_attach_t uscanner_attach;
static device_detach_t uscanner_detach;

static device_method_t uscanner_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		uscanner_match),
	DEVMETHOD(device_attach,	uscanner_attach),
	DEVMETHOD(device_detach,	uscanner_detach),

	{ 0, 0 }
};

static driver_t uscanner_driver = {
	"uscanner",
	uscanner_methods,
	sizeof(struct uscanner_softc)
};

static devclass_t uscanner_devclass;

static int
uscanner_match(device_t self)
{
	struct usb_attach_arg *uaa = device_get_ivars(self);
	usb_interface_descriptor_t *id;

	if (uaa->iface == NULL)
		return UMATCH_NONE;	/* do not grab the entire device */

	if (uscanner_lookup(uaa->vendor, uaa->product) == NULL)
		return UMATCH_NONE;	/* not in the list of known devices */
	id = usbd_get_interface_descriptor(uaa->iface);
	if (id == NULL)
		return UMATCH_NONE;

	/*
	 * There isn't a specific UICLASS for scanners, many vendors use
	 * UICLASS_VENDOR, so detecting the right interface is not so easy.
	 * But certainly we can exclude PRINTER and MASS - which some
	 * multifunction devices implement.
	 */
	if (id->bInterfaceClass == UICLASS_PRINTER ||
	    id->bInterfaceClass == UICLASS_MASS)
		return UMATCH_NONE;

	return UMATCH_VENDOR_PRODUCT;	/* ok we found it */
}

static int
uscanner_attach(device_t self)
{
	struct uscanner_softc *sc = device_get_softc(self);
	struct usb_attach_arg *uaa = device_get_ivars(self);
	usb_interface_descriptor_t *id = 0;
	usb_endpoint_descriptor_t *ed, *ed_bulkin = NULL, *ed_bulkout = NULL;
	int i;
	usbd_status err;
	int ifnum;

	sc->sc_dev = self;
	sc->sc_dev_flags = uscanner_lookup(uaa->vendor, uaa->product)->flags;
	sc->sc_udev = uaa->device;

	id = usbd_get_interface_descriptor(uaa->iface);
	ifnum = id->bInterfaceNumber;
#if 0
	/*
	 * This was in the original driver, but we cannot change the
	 * configuration of the whole device while attaching only to
	 * one of its interfaces. This can kill other already-attached
	 * driver, and/or possibly prevent this driver from attaching
	 * if an error occurs in set_config_no.
	 * If a device need setting the configuration, this must be done
	 * before attaching drivers to the various interfaces.
	 */
	err = usbd_set_config_no(uaa->device, 1, 1); /* XXX */
	if (err) {
		printf("%s: setting config no failed\n",
		    device_get_nameunit(sc->sc_dev));
		return ENXIO;
	}
#endif
	err = usbd_device2interface_handle(sc->sc_udev, ifnum, &sc->sc_iface);
	if (!err && sc->sc_iface)
	    id = usbd_get_interface_descriptor(sc->sc_iface);
	if (err || id == 0) {
		printf("%s: could not get interface descriptor, err=%d,id=%p\n",
		       device_get_nameunit(sc->sc_dev), err, id);
		return ENXIO;
	}

	/* Find the two first bulk endpoints */
	for (i = 0 ; i < id->bNumEndpoints; i++) {
		ed = usbd_interface2endpoint_descriptor(sc->sc_iface, i);
		if (ed == 0) {
			printf("%s: could not read endpoint descriptor\n",
			       device_get_nameunit(sc->sc_dev));
			return ENXIO;
		}

		if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN
		    && (ed->bmAttributes & UE_XFERTYPE) == UE_BULK) {
			ed_bulkin = ed;
		} else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT
		    && (ed->bmAttributes & UE_XFERTYPE) == UE_BULK) {
		        ed_bulkout = ed;
		}

		if (ed_bulkin && ed_bulkout)	/* found all we need */
			break;
	}

	/* Verify that we goething sensible */
	if (ed_bulkin == NULL || ed_bulkout == NULL) {
		printf("%s: bulk-in and/or bulk-out endpoint not found\n",
			device_get_nameunit(sc->sc_dev));
		return ENXIO;
	}

	sc->sc_bulkin = ed_bulkin->bEndpointAddress;
	sc->sc_bulkout = ed_bulkout->bEndpointAddress;

	/* the main device, ctrl endpoint */
	sc->dev = make_dev(&uscanner_cdevsw, device_get_unit(sc->sc_dev),
		UID_ROOT, GID_OPERATOR, 0644, "%s", device_get_nameunit(sc->sc_dev));
	usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev,sc->sc_dev);

	return 0;
}

int
uscanneropen(struct cdev *dev, int flag, int mode, struct thread *p)
{
	struct uscanner_softc *sc;
	int unit = USCANNERUNIT(dev);
	usbd_status err;

	sc = devclass_get_softc(uscanner_devclass, unit);
	if (sc == NULL)
		return (ENXIO);

 	DPRINTFN(5, ("uscanneropen: flag=%d, mode=%d, unit=%d\n",
		     flag, mode, unit));

	if (sc->sc_dying)
		return (ENXIO);

	if (sc->sc_state & USCANNER_OPEN)
		return (EBUSY);

	sc->sc_state |= USCANNER_OPEN;

	sc->sc_bulkin_buffer = malloc(USCANNER_BUFFERSIZE, M_USBDEV, M_WAITOK);
	sc->sc_bulkout_buffer = malloc(USCANNER_BUFFERSIZE, M_USBDEV, M_WAITOK);
	/* No need to check buffers for NULL since we have WAITOK */

	sc->sc_bulkin_bufferlen = USCANNER_BUFFERSIZE;
	sc->sc_bulkout_bufferlen = USCANNER_BUFFERSIZE;

	/* We have decided on which endpoints to use, now open the pipes */
	if (sc->sc_bulkin_pipe == NULL) {
		err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin,
				     USBD_EXCLUSIVE_USE, &sc->sc_bulkin_pipe);
		if (err) {
			printf("%s: cannot open bulk-in pipe (addr %d)\n",
			       device_get_nameunit(sc->sc_dev), sc->sc_bulkin);
			uscanner_do_close(sc);
			return (EIO);
		}
	}
	if (sc->sc_bulkout_pipe == NULL) {
		err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout,
				     USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
		if (err) {
			printf("%s: cannot open bulk-out pipe (addr %d)\n",
			       device_get_nameunit(sc->sc_dev), sc->sc_bulkout);
			uscanner_do_close(sc);
			return (EIO);
		}
	}

	sc->sc_bulkin_xfer = usbd_alloc_xfer(sc->sc_udev);
	if (sc->sc_bulkin_xfer == NULL) {
		uscanner_do_close(sc);
		return (ENOMEM);
	}
	sc->sc_bulkout_xfer = usbd_alloc_xfer(sc->sc_udev);
	if (sc->sc_bulkout_xfer == NULL) {
		uscanner_do_close(sc);
		return (ENOMEM);
	}

	return (0);	/* success */
}

int
uscannerclose(struct cdev *dev, int flag, int mode, struct thread *p)
{
	struct uscanner_softc *sc;

	sc = devclass_get_softc(uscanner_devclass, USCANNERUNIT(dev));
	DPRINTFN(5, ("uscannerclose: flag=%d, mode=%d, unit=%d\n",
		     flag, mode, USCANNERUNIT(dev)));

#ifdef DIAGNOSTIC
	if (!(sc->sc_state & USCANNER_OPEN)) {
		printf("uscannerclose: not open\n");
		return (EINVAL);
	}
#endif

	uscanner_do_close(sc);

	return (0);
}

void
uscanner_do_close(struct uscanner_softc *sc)
{
	if (sc->sc_bulkin_xfer) {
		usbd_free_xfer(sc->sc_bulkin_xfer);
		sc->sc_bulkin_xfer = NULL;
	}
	if (sc->sc_bulkout_xfer) {
		usbd_free_xfer(sc->sc_bulkout_xfer);
		sc->sc_bulkout_xfer = NULL;
	}

	if (!(sc->sc_dev_flags & USC_KEEP_OPEN)) {
		if (sc->sc_bulkin_pipe != NULL) {
			usbd_abort_pipe(sc->sc_bulkin_pipe);
			usbd_close_pipe(sc->sc_bulkin_pipe);
			sc->sc_bulkin_pipe = NULL;
		}
		if (sc->sc_bulkout_pipe != NULL) {
			usbd_abort_pipe(sc->sc_bulkout_pipe);
			usbd_close_pipe(sc->sc_bulkout_pipe);
			sc->sc_bulkout_pipe = NULL;
		}
	}

	if (sc->sc_bulkin_buffer) {
		free(sc->sc_bulkin_buffer, M_USBDEV);
		sc->sc_bulkin_buffer = NULL;
	}
	if (sc->sc_bulkout_buffer) {
		free(sc->sc_bulkout_buffer, M_USBDEV);
		sc->sc_bulkout_buffer = NULL;
	}

	sc->sc_state &= ~USCANNER_OPEN;
}

static int
uscanner_do_read(struct uscanner_softc *sc, struct uio *uio, int flag)
{
	u_int32_t n, tn;
	usbd_status err;
	int error = 0;

	DPRINTFN(5, ("%s: uscannerread\n", device_get_nameunit(sc->sc_dev)));

	if (sc->sc_dying)
		return (EIO);

	while ((n = min(sc->sc_bulkin_bufferlen, uio->uio_resid)) != 0) {
		DPRINTFN(1, ("uscannerread: start transfer %d bytes\n",n));
		tn = n;

		err = usbd_bulk_transfer(
			sc->sc_bulkin_xfer, sc->sc_bulkin_pipe,
			USBD_SHORT_XFER_OK, USBD_NO_TIMEOUT,
			sc->sc_bulkin_buffer, &tn,
			"uscnrb");
		if (err) {
			if (err == USBD_INTERRUPTED)
				error = EINTR;
			else if (err == USBD_TIMEOUT)
				error = ETIMEDOUT;
			else
				error = EIO;
			break;
		}
		DPRINTFN(1, ("uscannerread: got %d bytes\n", tn));
		error = uiomove(sc->sc_bulkin_buffer, tn, uio);
		if (error || tn < n)
			break;
	}

	return (error);
}

int
uscannerread(struct cdev *dev, struct uio *uio, int flag)
{
	struct uscanner_softc *sc;
	int error;

	sc = devclass_get_softc(uscanner_devclass, USCANNERUNIT(dev));
	sc->sc_refcnt++;
	error = uscanner_do_read(sc, uio, flag);
	if (--sc->sc_refcnt < 0)
		usb_detach_wakeup(sc->sc_dev);

	return (error);
}

static int
uscanner_do_write(struct uscanner_softc *sc, struct uio *uio, int flag)
{
	u_int32_t n;
	int error = 0;
	usbd_status err;

	DPRINTFN(5, ("%s: uscanner_do_write\n", device_get_nameunit(sc->sc_dev)));

	if (sc->sc_dying)
		return (EIO);

	while ((n = min(sc->sc_bulkout_bufferlen, uio->uio_resid)) != 0) {
		error = uiomove(sc->sc_bulkout_buffer, n, uio);
		if (error)
			break;
		DPRINTFN(1, ("uscanner_do_write: transfer %d bytes\n", n));
		err = usbd_bulk_transfer(
			sc->sc_bulkout_xfer, sc->sc_bulkout_pipe,
			0, USBD_NO_TIMEOUT,
			sc->sc_bulkout_buffer, &n,
			"uscnwb");
		if (err) {
			if (err == USBD_INTERRUPTED)
				error = EINTR;
			else
				error = EIO;
			break;
		}
	}

	return (error);
}

int
uscannerwrite(struct cdev *dev, struct uio *uio, int flag)
{
	struct uscanner_softc *sc;
	int error;

	sc = devclass_get_softc(uscanner_devclass, USCANNERUNIT(dev));
	sc->sc_refcnt++;
	error = uscanner_do_write(sc, uio, flag);
	if (--sc->sc_refcnt < 0)
		usb_detach_wakeup(sc->sc_dev);
	return (error);
}

static int
uscanner_detach(device_t self)
{
	struct uscanner_softc *sc = device_get_softc(self);
	int s;

	DPRINTF(("uscanner_detach: sc=%p\n", sc));

	sc->sc_dying = 1;
	sc->sc_dev_flags = 0;	/* make close really close device */

	/* Abort all pipes.  Causes processes waiting for transfer to wake. */
	if (sc->sc_bulkin_pipe != NULL)
		usbd_abort_pipe(sc->sc_bulkin_pipe);
	if (sc->sc_bulkout_pipe != NULL)
		usbd_abort_pipe(sc->sc_bulkout_pipe);

	s = splusb();
	if (--sc->sc_refcnt >= 0) {
		/* Wait for processes to go away. */
		usb_detach_wait(sc->sc_dev);
	}
	splx(s);

	/* destroy the device for the control endpoint */
	destroy_dev(sc->dev);
	usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev, sc->sc_dev);

	return (0);
}

int
uscannerpoll(struct cdev *dev, int events, struct thread *p)
{
	struct uscanner_softc *sc;
	int revents = 0;

	sc = devclass_get_softc(uscanner_devclass, USCANNERUNIT(dev));
	if (sc->sc_dying)
		return (EIO);

	/*
	 * We have no easy way of determining if a read will
	 * yield any data or a write will happen.
	 * Pretend they will.
	 */
	revents |= events &
		   (POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM);

	return (revents);
}

MODULE_DEPEND(uscanner, usb, 1, 1, 1);
DRIVER_MODULE(uscanner, uhub, uscanner_driver, uscanner_devclass, usbd_driver_load, 0);