xref: /src/sys/dev/usb/uirda.c

/*	$NetBSD: uirda.c,v 1.2 2001/12/13 02:16:21 augustss Exp $	*/

/*
 * Copyright (c) 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Lennart Augustsson (lennart (at) 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.
 * 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uirda.c,v 1.2 2001/12/13 02:16:21 augustss Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/lock.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/file.h>
#include <sys/poll.h>
#include <sys/select.h>
#include <sys/proc.h>

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

#include <dev/ir/ir.h>
#include <dev/ir/irdaio.h>
#include <dev/ir/irframevar.h>

#ifdef URIO_DEBUG
#define DPRINTF(x)	if (uirdadebug) logprintf x
#define DPRINTFN(n,x)	if (uirdadebug>(n)) logprintf x
int	uirdadebug = 1;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

/*
 * Protocol related definitions
 */

/* Inbound header byte */
#define UIRDA_MEDIA_BUSY	0x80
#define UIRDA_SPEED_MASK	0x0f
#define UIRDA_NO_SPEED		0x00
#define UIRDA_2400		0x01
#define UIRDA_9600		0x02
#define UIRDA_19200		0x03
#define UIRDA_38400		0x04
#define UIRDA_57600		0x05
#define UIRDA_115200		0x06
#define UIRDA_576000		0x07
#define UIRDA_1152000		0x08
#define UIRDA_4000000		0x09

/* Outbound header byte */
#define UIRDA_EB_NO_CHANGE	0x00
#define UIRDA_EB_48		0x10
#define UIRDA_EB_24		0x20
#define UIRDA_EB_12		0x30
#define UIRDA_EB_6		0x40
#define UIRDA_EB_3		0x50
#define UIRDA_EB_2		0x60
#define UIRDA_EB_1		0x70
#define UIRDA_EB_0		0x80
/* Speeds as above */

/* Class specific requests */
#define UR_IRDA_RECEIVING		0x01	/* Receive in progress? */
#define UR_IRDA_CHECK_MEDIA_BUSY	0x03
#define UR_IRDA_SET_RATE_SNIFF		0x04	/* opt */
#define UR_IRDA_SET_UNICAST_LIST	0x05	/* opt */
#define UR_IRDA_GET_DESC		0x06

typedef struct {
	uByte		bLength;
	uByte		bDescriptorType;
#define UDESC_IRDA	0x21
	uByte		bDescriptorSubtype;
	uByte		bmDataSize;
#define UI_DS_2048	0x20
#define UI_DS_1024	0x10
#define UI_DS_512	0x08
#define UI_DS_256	0x04
#define UI_DS_128	0x02
#define UI_DS_64	0x01
	uByte		bmWindowSize;
#define UI_WS_7		0x40
#define UI_WS_6		0x20
#define UI_WS_5		0x10
#define UI_WS_4		0x08
#define UI_WS_3		0x04
#define UI_WS_2		0x02
#define UI_WS_1		0x01
	uByte		bmMinTurnaroundTime;
#define UI_TA_0		0x80
#define UI_TA_10	0x40
#define UI_TA_50	0x20
#define UI_TA_100	0x10
#define UI_TA_500	0x08
#define UI_TA_1000	0x04
#define UI_TA_5000	0x02
#define UI_TA_10000	0x01
	uWord		wBaudRate;
#define UI_BR_4000000	0x0100
#define UI_BR_1152000	0x0080
#define UI_BR_576000	0x0040
#define UI_BR_115200	0x0020
#define UI_BR_57600	0x0010
#define UI_BR_38400	0x0008
#define UI_BR_19200	0x0004
#define UI_BR_9600	0x0002
#define UI_BR_2400	0x0001
	uByte		bmAdditionalBOFs;
#define UI_EB_0		0x80
#define UI_EB_1		0x40
#define UI_EB_2		0x20
#define UI_EB_3		0x10
#define UI_EB_6		0x08
#define UI_EB_12	0x04
#define UI_EB_24	0x02
#define UI_EB_48	0x01
	uByte		bIrdaSniff;
	uByte		bMaxUnicastList;
} UPACKED usb_irda_descriptor_t;
#define USB_IRDA_DESCRIPTOR_SIZE 12


#define UIRDA_NEBOFS 8
static struct {
	int count;
	int mask;
	int header;
} uirda_ebofs[UIRDA_NEBOFS] = {
	{ 0, UI_EB_0, UIRDA_EB_0 },
	{ 1, UI_EB_1, UIRDA_EB_1 },
	{ 2, UI_EB_2, UIRDA_EB_2 },
	{ 3, UI_EB_3, UIRDA_EB_3 },
	{ 6, UI_EB_6, UIRDA_EB_6 },
	{ 12, UI_EB_12, UIRDA_EB_12 },
	{ 24, UI_EB_24, UIRDA_EB_24 },
	{ 48, UI_EB_48, UIRDA_EB_48 }
};

#define UIRDA_NSPEEDS 9
static struct {
	int speed;
	int mask;
	int header;
} uirda_speeds[UIRDA_NSPEEDS] = {
	{ 4000000, UI_BR_4000000, UIRDA_4000000 },
	{ 1152000, UI_BR_1152000, UIRDA_1152000 },
	{ 576000, UI_BR_576000, UIRDA_576000 },
	{ 115200, UI_BR_115200, UIRDA_115200 },
	{ 57600, UI_BR_57600, UIRDA_57600 },
	{ 38400, UI_BR_38400, UIRDA_38400 },
	{ 19200, UI_BR_19200, UIRDA_19200 },
	{ 9600, UI_BR_9600, UIRDA_9600 },
	{ 2400, UI_BR_2400, UIRDA_2400 },
};

struct uirda_softc {
 	USBBASEDEVICE		sc_dev;
	usbd_device_handle	sc_udev;
	usbd_interface_handle	sc_iface;

	struct lock		sc_rd_buf_lk;
	u_int8_t		*sc_rd_buf;
	int			sc_rd_addr;
	usbd_pipe_handle	sc_rd_pipe;
	usbd_xfer_handle	sc_rd_xfer;
	struct selinfo		sc_rd_sel;
	u_int			sc_rd_count;

	struct lock		sc_wr_buf_lk;
	u_int8_t		*sc_wr_buf;
	int			sc_wr_addr;
	usbd_xfer_handle	sc_wr_xfer;
	usbd_pipe_handle	sc_wr_pipe;

	struct device		*sc_child;
	struct irda_params	sc_params;
	usb_irda_descriptor_t	sc_irdadesc;

	int			sc_refcnt;
	char			sc_dying;
};

#define UIRDA_WR_TIMEOUT 200

int uirda_open(void *h, int flag, int mode, struct proc *p);
int uirda_close(void *h, int flag, int mode, struct proc *p);
int uirda_read(void *h, struct uio *uio, int flag);
int uirda_write(void *h, struct uio *uio, int flag);
int uirda_set_params(void *h, struct irda_params *params);
int uirda_get_speeds(void *h, int *speeds);
int uirda_get_turnarounds(void *h, int *times);
int uirda_poll(void *h, int events, struct proc *p);

struct irframe_methods uirda_methods = {
	uirda_open, uirda_close, uirda_read, uirda_write, uirda_poll,
	uirda_set_params, uirda_get_speeds, uirda_get_turnarounds
};

void uirda_rd_cb(usbd_xfer_handle xfer,	usbd_private_handle priv,
		 usbd_status status);
usbd_status uirda_start_read(struct uirda_softc *sc);

usb_descriptor_t *usb_find_desc(usbd_device_handle dev, int type);

/*
 * These devices don't quite follow the spec.  Speed changing is broken
 * and they don't handle windows.
 * But we change speed in a safe way, and don't use windows now.
 * Some devices also seem to have an interrupt pipe that can be ignored.
 *
 * Table information taken from Linux driver.
 */
Static const struct usb_devno uirda_devs[] = {
	{ USB_VENDOR_ACTISYS, USB_PRODUCT_ACTISYS_IR2000U },
	{ USB_VENDOR_EXTENDED, USB_PRODUCT_EXTENDED_XTNDACCESS },
	{ USB_VENDOR_KAWATSU, USB_PRODUCT_KAWATSU_KC180 },
};
#define uirda_lookup(v, p) (usb_lookup(uirda_devs, v, p))

USB_DECLARE_DRIVER(uirda);

USB_MATCH(uirda)
{
	USB_MATCH_START(uirda, uaa);
	usb_interface_descriptor_t *id;

	DPRINTFN(50,("uirda_match\n"));

	if (uaa->iface == NULL)
		return (UMATCH_NONE);

	if (uirda_lookup(uaa->vendor, uaa->product) != NULL)
		return (UMATCH_VENDOR_PRODUCT);

	id = usbd_get_interface_descriptor(uaa->iface);
	if (id != NULL &&
	    id->bInterfaceClass == UICLASS_APPL_SPEC &&
	    id->bInterfaceSubClass == UISUBCLASS_IRDA &&
	    id->bInterfaceProtocol == UIPROTO_IRDA)
		return (UMATCH_IFACECLASS_IFACESUBCLASS_IFACEPROTO);
	return (UMATCH_NONE);
}

USB_ATTACH(uirda)
{
	USB_ATTACH_START(uirda, sc, uaa);
	usbd_device_handle	dev = uaa->device;
	usbd_interface_handle	iface = uaa->iface;
	char			devinfo[1024];
	usb_endpoint_descriptor_t *ed;
	usbd_status		err;
	u_int8_t		epcount;
	int			i;
	struct ir_attach_args	ia;

	DPRINTFN(10,("uirda_attach: sc=%p\n", sc));

	usbd_devinfo(dev, 0, devinfo);
	USB_ATTACH_SETUP;
	printf("%s: %s\n", USBDEVNAME(sc->sc_dev), devinfo);

	sc->sc_udev = dev;
	sc->sc_iface = iface;

	epcount = 0;
	(void)usbd_endpoint_count(iface, &epcount);

	sc->sc_rd_addr = -1;
	sc->sc_wr_addr = -1;
	for (i = 0; i < epcount; i++) {
		ed = usbd_interface2endpoint_descriptor(iface, i);
		if (ed == NULL) {
			printf("%s: couldn't get ep %d\n",
			    USBDEVNAME(sc->sc_dev), i);
			USB_ATTACH_ERROR_RETURN;
		}
		if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
		    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
			sc->sc_rd_addr = ed->bEndpointAddress;
		} else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
			   UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
			sc->sc_wr_addr = ed->bEndpointAddress;
		}
	}
	if (sc->sc_rd_addr == -1 || sc->sc_wr_addr == -1) {
		printf("%s: missing endpoint\n", USBDEVNAME(sc->sc_dev));
		USB_ATTACH_ERROR_RETURN;
	}

	/* Get the IrDA descriptor */
	err = usbd_get_desc(sc->sc_udev, UDESC_IRDA, 0,
		  USB_IRDA_DESCRIPTOR_SIZE, &sc->sc_irdadesc);
	if (err) {
		/* maybe it's embedded in the config desc */
		void *d = usb_find_desc(sc->sc_udev, UDESC_IRDA);
		if (d == NULL) {
			printf("%s: Cannot get IrDA descriptor\n",
			       USBDEVNAME(sc->sc_dev));
			USB_ATTACH_ERROR_RETURN;
		}
		memcpy(&sc->sc_irdadesc, d, USB_IRDA_DESCRIPTOR_SIZE);
	}


	DPRINTFN(10, ("uirda_attach: %p\n", sc->sc_udev));

	usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev,
			   USBDEV(sc->sc_dev));

	ia.ia_type = IR_TYPE_IRFRAME;
	ia.ia_methods = &uirda_methods;
	ia.ia_handle = sc;

	sc->sc_child = config_found(self, &ia, ir_print);

	USB_ATTACH_SUCCESS_RETURN;
}

USB_DETACH(uirda)
{
	USB_DETACH_START(uirda, sc);
	int s;
	int rv = 0;

	DPRINTF(("uirda_detach: sc=%p flags=%d\n", sc, flags));

	sc->sc_dying = 1;
	/* Abort all pipes.  Causes processes waiting for transfer to wake. */
	if (sc->sc_rd_pipe != NULL) {
		usbd_abort_pipe(sc->sc_rd_pipe);
		usbd_close_pipe(sc->sc_rd_pipe);
		sc->sc_rd_pipe = NULL;
	}
	if (sc->sc_wr_pipe != NULL) {
		usbd_abort_pipe(sc->sc_wr_pipe);
		usbd_close_pipe(sc->sc_wr_pipe);
		sc->sc_wr_pipe = NULL;
	}
	wakeup(&sc->sc_rd_count);

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

	if (sc->sc_child != NULL) {
		rv = config_detach(sc->sc_child, flags);
		sc->sc_child = NULL;
	}

	usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev,
			   USBDEV(sc->sc_dev));

	return (rv);
}

int
uirda_activate(device_ptr_t self, enum devact act)
{
	struct uirda_softc *sc = (struct uirda_softc *)self;
	int error = 0;

	switch (act) {
	case DVACT_ACTIVATE:
		return (EOPNOTSUPP);
		break;

	case DVACT_DEACTIVATE:
		sc->sc_dying = 1;
		if (sc->sc_child != NULL)
			error = config_deactivate(sc->sc_child);
		break;
	}
	return (error);
}

int
uirda_open(void *h, int flag, int mode, struct proc *p)
{
	struct uirda_softc *sc = h;
	int error;
	usbd_status err;

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

	err = usbd_open_pipe(sc->sc_iface, sc->sc_rd_addr, 0, &sc->sc_rd_pipe);
	if (err) {
		error = EIO;
		goto bad1;
	}
	err = usbd_open_pipe(sc->sc_iface, sc->sc_wr_addr, 0, &sc->sc_wr_pipe);
	if (err) {
		error = EIO;
		goto bad2;
	}
	sc->sc_rd_xfer = usbd_alloc_xfer(sc->sc_udev);
	if (sc->sc_rd_xfer == NULL) {
		error = ENOMEM;
		goto bad3;
	}
	sc->sc_wr_xfer = usbd_alloc_xfer(sc->sc_udev);
	if (sc->sc_wr_xfer == NULL) {
		error = ENOMEM;
		goto bad4;
	}

	sc->sc_rd_count = 0;
	sc->sc_params.speed = 0;
	sc->sc_params.ebofs = 0;
	sc->sc_params.maxsize = 0;

	return (0);

bad4:
	usbd_free_xfer(sc->sc_rd_xfer);
	sc->sc_rd_xfer = NULL;
bad3:
	usbd_close_pipe(sc->sc_wr_pipe);
	sc->sc_wr_pipe = NULL;
bad2:
	usbd_close_pipe(sc->sc_rd_pipe);
	sc->sc_rd_pipe = NULL;
bad1:
	return (error);
}

int
uirda_close(void *h, int flag, int mode, struct proc *p)
{
	struct uirda_softc *sc = h;

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

	if (sc->sc_rd_pipe != NULL) {
		usbd_abort_pipe(sc->sc_rd_pipe);
		usbd_close_pipe(sc->sc_rd_pipe);
		sc->sc_rd_pipe = NULL;
	}
	if (sc->sc_wr_pipe != NULL) {
		usbd_abort_pipe(sc->sc_wr_pipe);
		usbd_close_pipe(sc->sc_wr_pipe);
		sc->sc_wr_pipe = NULL;
	}
	if (sc->sc_rd_xfer != NULL) {
		usbd_free_xfer(sc->sc_rd_xfer);
		sc->sc_rd_xfer = NULL;
		sc->sc_rd_buf = NULL;
	}
	if (sc->sc_wr_xfer != NULL) {
		usbd_free_xfer(sc->sc_wr_xfer);
		sc->sc_wr_xfer = NULL;
		sc->sc_wr_buf = NULL;
	}

	return (0);
}

int
uirda_read(void *h, struct uio *uio, int flag)
{
	struct uirda_softc *sc = h;
	usbd_status err;
	int s;
	int error;
	u_int n;

	DPRINTFN(1,("%s: sc=%p\n", __FUNCTION__, sc));

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

	if (sc->sc_rd_buf == NULL)
		return (EINVAL);

	sc->sc_refcnt++;

	do {
		s = splusb();
		while (sc->sc_rd_count == 0) {
			error = tsleep(&sc->sc_rd_count, PZERO | PCATCH,
				       "uirdrd", 0);
			if (sc->sc_dying)
				error = EIO;
			if (error) {
				splx(s);
				DPRINTF(("uirda_read: tsleep() = %d\n", error));
				goto ret;
			}
		}
		splx(s);

		lockmgr(&sc->sc_rd_buf_lk, LK_EXCLUSIVE, NULL);
		n = sc->sc_rd_count - 1;
		DPRINTFN(1,("%s: sc=%p n=%u\n", __FUNCTION__, sc, n));
		if (n > uio->uio_resid)
			error = EINVAL;
		else
			error = uiomove(sc->sc_rd_buf+1, n, uio);
		sc->sc_rd_count = 0;
		lockmgr(&sc->sc_rd_buf_lk, LK_RELEASE, NULL);

		err = uirda_start_read(sc);
		/* XXX check err */

	} while (n == 0);

	DPRINTFN(1,("uirda_read: return %d\n", error));

 ret:
	if (--sc->sc_refcnt < 0)
		usb_detach_wakeup(USBDEV(sc->sc_dev));
	return (error);
}

int
uirda_write(void *h, struct uio *uio, int flag)
{
	struct uirda_softc *sc = h;
	usbd_status err;
	u_int32_t n;
	int error = 0;

	DPRINTFN(1,("%s: sc=%p\n", __FUNCTION__, sc));

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

	n = uio->uio_resid;
	if (n > sc->sc_params.maxsize || sc->sc_wr_buf == NULL)
		return (EINVAL);

	sc->sc_refcnt++;
	lockmgr(&sc->sc_wr_buf_lk, LK_EXCLUSIVE, NULL);

	sc->sc_wr_buf[0] = UIRDA_EB_NO_CHANGE | UIRDA_NO_SPEED;
	error = uiomove(sc->sc_wr_buf+1, n, uio);
	if (!error) {
		DPRINTFN(1, ("uirdawrite: transfer %d bytes\n", n));

		err = usbd_bulk_transfer(sc->sc_wr_xfer, sc->sc_wr_pipe,
			  USBD_FORCE_SHORT_XFER | USBD_NO_COPY,
			  UIRDA_WR_TIMEOUT,
			  sc->sc_wr_buf, &n, "uirdawr");
		DPRINTFN(2, ("uirdawrite: err=%d\n", err));
		if (err) {
			if (err == USBD_INTERRUPTED)
				error = EINTR;
			else if (err == USBD_TIMEOUT)
				error = ETIMEDOUT;
			else
				error = EIO;
		}
	}

	lockmgr(&sc->sc_wr_buf_lk, LK_RELEASE, NULL);
	if (--sc->sc_refcnt < 0)
		usb_detach_wakeup(USBDEV(sc->sc_dev));

	DPRINTF(("%s: sc=%p done\n", __FUNCTION__, sc));
	return (error);
}

int
uirda_poll(void *h, int events, struct proc *p)
{
	struct uirda_softc *sc = h;
	int revents = 0;
	int s;

	DPRINTFN(1,("%s: sc=%p\n", __FUNCTION__, sc));

	s = splusb();
	if (events & (POLLOUT | POLLWRNORM))
		revents |= events & (POLLOUT | POLLWRNORM);
	if (events & (POLLIN | POLLRDNORM)) {
		if (sc->sc_rd_count != 0) {
			DPRINTF(("%s: have data\n", __FUNCTION__));
			revents |= events & (POLLIN | POLLRDNORM);
		} else {
			DPRINTF(("%s: recording select\n", __FUNCTION__));
			selrecord(p, &sc->sc_rd_sel);
		}
	}
	splx(s);

	return (revents);
}

int
uirda_set_params(void *h, struct irda_params *p)
{
	struct uirda_softc *sc = h;
	usbd_status err;
	int i;
	u_int8_t hdr;
	u_int32_t n;
	u_int mask;

	DPRINTF(("%s: sc=%p, speed=%d ebofs=%d maxsize=%d\n", __FUNCTION__,
		 sc, p->speed, p->ebofs, p->maxsize));

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

	hdr = 0;
	if (p->ebofs != sc->sc_params.ebofs) {
		/* round up ebofs */
		mask = sc->sc_irdadesc.bmAdditionalBOFs;
		for (i = 0; i < UIRDA_NEBOFS; i++) {
			if ((mask & uirda_ebofs[i].mask) &&
			    uirda_ebofs[i].count >= p->ebofs) {
				hdr = uirda_ebofs[i].header;
				goto found1;
			}
		}
		/* no good value found */
		return (EINVAL);
	found1:
		;

	}
	if (p->speed != sc->sc_params.speed) {
		/* find speed */
		mask = UGETW(sc->sc_irdadesc.wBaudRate);
		for (i = 0; i < UIRDA_NSPEEDS; i++) {
			if ((mask & uirda_speeds[i].mask) &&
			    uirda_speeds[i].speed == p->speed) {
				hdr |= uirda_speeds[i].header;
				goto found2;
			}
		}
		/* no good value found */
		return (EINVAL);
	found2:
		;
	}
	if (p->maxsize != sc->sc_params.maxsize) {
		DPRINTF(("%s: new buffers, old size=%d\n", __FUNCTION__,
			 sc->sc_params.maxsize));
		if (p->maxsize > 10000 || p < 0) /* XXX */
			return (EINVAL);

		/* Change the write buffer */
		lockmgr(&sc->sc_wr_buf_lk, LK_EXCLUSIVE, NULL);
		if (sc->sc_wr_buf != NULL)
			usbd_free_buffer(sc->sc_wr_xfer);
		sc->sc_wr_buf = usbd_alloc_buffer(sc->sc_wr_xfer, p->maxsize+1);
		lockmgr(&sc->sc_wr_buf_lk, LK_RELEASE, NULL);
		if (sc->sc_wr_buf == NULL)
			return (ENOMEM);

		/* Change the read buffer */
		lockmgr(&sc->sc_rd_buf_lk, LK_EXCLUSIVE, NULL);
		usbd_abort_pipe(sc->sc_rd_pipe);
		if (sc->sc_rd_buf != NULL)
			usbd_free_buffer(sc->sc_rd_xfer);
		sc->sc_rd_buf = usbd_alloc_buffer(sc->sc_rd_xfer, p->maxsize+1);
		sc->sc_rd_count = 0;
		if (sc->sc_rd_buf == NULL) {
			lockmgr(&sc->sc_rd_buf_lk, LK_RELEASE, NULL);
			return (ENOMEM);
		}
		err = uirda_start_read(sc); /* XXX check */
		lockmgr(&sc->sc_rd_buf_lk, LK_RELEASE, NULL);
	}
	if (hdr != 0) {
		/*
		 * A change has occurred, transmit a 0 length frame with
		 * the new settings.  The 0 length frame is not sent to the
		 * device.
		 */
		DPRINTFN(1,("%s: sc=%p setting speed\n", __FUNCTION__, sc));
		lockmgr(&sc->sc_wr_buf_lk, LK_EXCLUSIVE, NULL);
		sc->sc_wr_buf[0] = hdr;
		n = 1;
		err = usbd_bulk_transfer(sc->sc_wr_xfer, sc->sc_wr_pipe,
			  USBD_FORCE_SHORT_XFER | USBD_NO_COPY,
			  UIRDA_WR_TIMEOUT, sc->sc_wr_buf, &n, "uirdast");
		lockmgr(&sc->sc_wr_buf_lk, LK_RELEASE, NULL);
		if (err) {
			printf("%s: set failed, err=%d\n",
			    USBDEVNAME(sc->sc_dev), err);
			usbd_clear_endpoint_stall(sc->sc_wr_pipe);
		}
	}

	sc->sc_params = *p;

	return (0);
}

int
uirda_get_speeds(void *h, int *speeds)
{
	struct uirda_softc *sc = h;
	u_int isp;
	u_int usp;

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

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

	usp = UGETW(sc->sc_irdadesc.wBaudRate);
	isp = 0;
	if (usp & UI_BR_4000000) isp |= IRDA_SPEED_4000000;
	if (usp & UI_BR_1152000) isp |= IRDA_SPEED_1152000;
	if (usp & UI_BR_576000)  isp |= IRDA_SPEED_576000;
	if (usp & UI_BR_115200)  isp |= IRDA_SPEED_115200;
	if (usp & UI_BR_57600)   isp |= IRDA_SPEED_57600;
	if (usp & UI_BR_38400)   isp |= IRDA_SPEED_38400;
	if (usp & UI_BR_19200)   isp |= IRDA_SPEED_19200;
	if (usp & UI_BR_9600)    isp |= IRDA_SPEED_9600;
	if (usp & UI_BR_2400)    isp |= IRDA_SPEED_2400;
	*speeds = isp;
	return (0);
}

int
uirda_get_turnarounds(void *h, int *turnarounds)
{
	struct uirda_softc *sc = h;
	u_int ita;
	u_int uta;

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

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

	uta = sc->sc_irdadesc.bmMinTurnaroundTime;
	ita = 0;
	if (uta & UI_TA_0)     ita |= IRDA_TURNT_0;
	if (uta & UI_TA_10)    ita |= IRDA_TURNT_10;
	if (uta & UI_TA_50)    ita |= IRDA_TURNT_50;
	if (uta & UI_TA_100)   ita |= IRDA_TURNT_100;
	if (uta & UI_TA_500)   ita |= IRDA_TURNT_500;
	if (uta & UI_TA_1000)  ita |= IRDA_TURNT_1000;
	if (uta & UI_TA_5000)  ita |= IRDA_TURNT_5000;
	if (uta & UI_TA_10000) ita |= IRDA_TURNT_10000;
	*turnarounds = ita;
	return (0);
}

void
uirda_rd_cb(usbd_xfer_handle xfer, usbd_private_handle priv,
	    usbd_status status)
{
	struct uirda_softc *sc = priv;
	u_int32_t size;

	DPRINTFN(1,("%s: sc=%p\n", __FUNCTION__, sc));

	if (status == USBD_CANCELLED) /* this is normal */
		return;
	if (status) {
		/* what can we do? */
	}

	usbd_get_xfer_status(xfer, NULL, NULL, &size, NULL);
	DPRINTFN(1,("%s: sc=%p size=%u\n", __FUNCTION__, sc, size));
	sc->sc_rd_count = size;
	wakeup(&sc->sc_rd_count); /* XXX should use flag */
	selwakeup(&sc->sc_rd_sel);
}

usbd_status
uirda_start_read(struct uirda_softc *sc)
{
	usbd_status err;

	DPRINTFN(1,("%s: sc=%p\n", __FUNCTION__, sc));

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

	usbd_setup_xfer(sc->sc_rd_xfer, sc->sc_rd_pipe, sc, sc->sc_rd_buf,
			sc->sc_params.maxsize+1,
			USBD_SHORT_XFER_OK | USBD_NO_COPY,
			USBD_NO_TIMEOUT, uirda_rd_cb);
	err = usbd_transfer(sc->sc_rd_xfer);
	if (err != USBD_IN_PROGRESS)
		return (err);
	return (USBD_NORMAL_COMPLETION);
}




usb_descriptor_t *
usb_find_desc(usbd_device_handle dev, int type)
{
	usb_descriptor_t *desc;
	usb_config_descriptor_t *cd = usbd_get_config_descriptor(dev);
        uByte *p = (uByte *)cd;
        uByte *end = p + UGETW(cd->wTotalLength);

	while (p < end) {
		desc = (usb_descriptor_t *)p;
		if (desc->bDescriptorType == type)
			return (desc);
		p += desc->bLength;
	}

	return (NULL);
}