text: 
  /*-
   * Copyright (c) 1998 The NetBSD Foundation, Inc. All rights reserved.
   * Copyright (c) 1998 Lennart Augustsson. All rights reserved.
   * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
   *
   * 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 AUTHOR 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 AUTHOR 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.
   */ 
  
  #ifdef USB_GLOBAL_INCLUDE_FILE
  #include USB_GLOBAL_INCLUDE_FILE
  #else
  #include <sys/stdint.h>
  #include <sys/stddef.h>
  #include <sys/param.h>
  #include <sys/queue.h>
  #include <sys/types.h>
  #include <sys/systm.h>
  #include <sys/kernel.h>
  #include <sys/bus.h>
  #include <sys/module.h>
  #include <sys/lock.h>
  #include <sys/mutex.h>
  #include <sys/condvar.h>
  #include <sys/sysctl.h>
  #include <sys/sx.h>
  #include <sys/unistd.h>
  #include <sys/callout.h>
  #include <sys/malloc.h>
  #include <sys/priv.h>
  
  #include <dev/usb/usb.h>
  #include <dev/usb/usbdi.h>
  #include <dev/usb/usbdi_util.h>
  #include <dev/usb/usbhid.h>
  
  #define	USB_DEBUG_VAR usb_debug
  
  #include <dev/usb/usb_core.h>
  #include <dev/usb/usb_busdma.h>
  #include <dev/usb/usb_request.h>
  #include <dev/usb/usb_process.h>
  #include <dev/usb/usb_transfer.h>
  #include <dev/usb/usb_debug.h>
  #include <dev/usb/usb_device.h>
  #include <dev/usb/usb_util.h>
  #include <dev/usb/usb_dynamic.h>
  
  #include <dev/usb/usb_controller.h>
  #include <dev/usb/usb_bus.h>
  #include <sys/ctype.h>
  #include <dev/usb/usb_tpw_probe_declare.h>
  #endif			
  
  static int usb_no_cs_fail;
  
  SYSCTL_INT(_hw_usb, OID_AUTO, no_cs_fail, CTLFLAG_RWTUN,
      &usb_no_cs_fail, 0, "USB clear stall failures are ignored, if set");
  
  static int usb_full_ddesc;
  
  SYSCTL_INT(_hw_usb, OID_AUTO, full_ddesc, CTLFLAG_RWTUN,
      &usb_full_ddesc, 0, "USB always read complete device descriptor, if set");
  
  #ifdef USB_DEBUG
  #ifdef USB_REQ_DEBUG
  
  struct usb_ctrl_debug {
  	int bus_index;		
  	int dev_index;		
  	int ds_fail;		
  	int ss_fail;		
  	int ds_delay;		
  	int ss_delay;		
  	int bmRequestType_value;
  	int bRequest_value;
  };
  
  struct usb_ctrl_debug_bits {
  	uint16_t ds_delay;
  	uint16_t ss_delay;
  	uint8_t ds_fail:1;
  	uint8_t ss_fail:1;
  	uint8_t enabled:1;
  };
  
  
  
  static struct usb_ctrl_debug usb_ctrl_debug = {
  	.bus_index = -1,
  	.dev_index = -1,
  	.bmRequestType_value = -1,
  	.bRequest_value = -1,
  };
  
  SYSCTL_INT(_hw_usb, OID_AUTO, ctrl_bus_fail, CTLFLAG_RWTUN,
      &usb_ctrl_debug.bus_index, 0, "USB controller index to fail");
  SYSCTL_INT(_hw_usb, OID_AUTO, ctrl_dev_fail, CTLFLAG_RWTUN,
      &usb_ctrl_debug.dev_index, 0, "USB device address to fail");
  SYSCTL_INT(_hw_usb, OID_AUTO, ctrl_ds_fail, CTLFLAG_RWTUN,
      &usb_ctrl_debug.ds_fail, 0, "USB fail data stage");
  SYSCTL_INT(_hw_usb, OID_AUTO, ctrl_ss_fail, CTLFLAG_RWTUN,
      &usb_ctrl_debug.ss_fail, 0, "USB fail status stage");
  SYSCTL_INT(_hw_usb, OID_AUTO, ctrl_ds_delay, CTLFLAG_RWTUN,
      &usb_ctrl_debug.ds_delay, 0, "USB data stage delay in ms");
  SYSCTL_INT(_hw_usb, OID_AUTO, ctrl_ss_delay, CTLFLAG_RWTUN,
      &usb_ctrl_debug.ss_delay, 0, "USB status stage delay in ms");
  SYSCTL_INT(_hw_usb, OID_AUTO, ctrl_rt_fail, CTLFLAG_RWTUN,
      &usb_ctrl_debug.bmRequestType_value, 0, "USB bmRequestType to fail");
  SYSCTL_INT(_hw_usb, OID_AUTO, ctrl_rv_fail, CTLFLAG_RWTUN,
      &usb_ctrl_debug.bRequest_value, 0, "USB bRequest to fail");
  
  /*------------------------------------------------------------------------*
   *	usbd_get_debug_bits
   *
   * This function is only useful in USB host mode.
   *------------------------------------------------------------------------*/
  static void
  usbd_get_debug_bits(struct usb_device *udev, struct usb_device_request *req,
      struct usb_ctrl_debug_bits *dbg)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_get_debug_bits, entry);
  	int temp;
  
  	memset(dbg, 0, sizeof(*dbg));
  
  	
  
  	temp = usb_ctrl_debug.ds_delay;
  	if (temp < 0)
  {
  		temp = 0;
  }
  	else if (temp > (16*1024))
  {
  		temp = (16*1024);
  }
  
  	dbg->ds_delay = temp;
  
  	
  
  	temp = usb_ctrl_debug.ss_delay;
  	if (temp < 0)
  {
  		temp = 0;
  }
  	else if (temp > (16*1024))
  {
  		temp = (16*1024);
  }
  
  	dbg->ss_delay = temp;
  
  	
  
  	if (usbd_get_bus_index(udev) != usb_ctrl_debug.bus_index)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_get_debug_bits, return);
  		return;
  }
  
  	if (usbd_get_device_index(udev) != usb_ctrl_debug.dev_index)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_get_debug_bits, return);
  		return;
  }
  
  	temp = usb_ctrl_debug.bmRequestType_value;
  
  	if ((temp != req->bmRequestType) && (temp >= 0) && (temp <= 255))
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_get_debug_bits, return);
  		return;
  }
  
  	temp = usb_ctrl_debug.bRequest_value;
  
  	if ((temp != req->bRequest) && (temp >= 0) && (temp <= 255))
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_get_debug_bits, return);
  		return;
  }
  
  	temp = usb_ctrl_debug.ds_fail;
  	if (temp)
  {
  		dbg->ds_fail = 1;
  }
  
  	temp = usb_ctrl_debug.ss_fail;
  	if (temp)
  {
  		dbg->ss_fail = 1;
  }
  
  	dbg->enabled = 1;
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_get_debug_bits, return);
  }
  #endif	
  #endif	
  
  /*------------------------------------------------------------------------*
   *	usbd_do_request_callback
   *
   * This function is the USB callback for generic USB Host control
   * transfers.
   *------------------------------------------------------------------------*/
  void
  usbd_do_request_callback(struct usb_xfer *xfer, usb_error_t error)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_do_request_callback, entry);
  	;				
  
  	DPRINTF("st=%u\n", USB_GET_STATE(xfer));
  
  	switch (USB_GET_STATE(xfer)) {
  	case USB_ST_SETUP:
  		usbd_transfer_submit(xfer);
  		break;
  	default:
  		cv_signal(&xfer->xroot->udev->ctrlreq_cv);
  		break;
  	}
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_do_request_callback, return);
  }
  
  /*------------------------------------------------------------------------*
   *	usb_do_clear_stall_callback
   *
   * This function is the USB callback for generic clear stall requests.
   *------------------------------------------------------------------------*/
  void
  usb_do_clear_stall_callback(struct usb_xfer *xfer, usb_error_t error)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usb_do_clear_stall_callback, entry);
  	struct usb_device_request req;
  	struct usb_device *udev;
  	struct usb_endpoint *ep;
  	struct usb_endpoint *ep_end;
  	struct usb_endpoint *ep_first;
  	usb_stream_t x;
  	uint8_t to;
  
  	udev = xfer->xroot->udev;
  
  	USB_BUS_LOCK(udev->bus);
  
  	
  
  	ep = udev->ep_curr;
  	ep_end = udev->endpoints + udev->endpoints_max;
  	ep_first = udev->endpoints;
  	to = udev->endpoints_max;
  
  	switch (USB_GET_STATE(xfer)) {
  	case USB_ST_TRANSFERRED:
  tr_transferred:
  		
  		udev->clear_stall_errors = 0;
  
  		if (ep == NULL)
  {
  			goto tr_setup;		
  }
  		if (ep->edesc &&
  		    ep->is_stalled) {
  			ep->toggle_next = 0;
  			ep->is_stalled = 0;
  			
  			usbd_clear_stall_locked(udev, ep);
  			for (x = 0; x != USB_MAX_EP_STREAMS; x++) {
  				
  				usb_command_wrapper(&ep->endpoint_q[x],
  				    ep->endpoint_q[x].curr);
  			}
  		}
  		ep++;
  
  	case USB_ST_SETUP:
  tr_setup:
  		if (to == 0)
  {
  			break;			
  }
  		if ((ep < ep_first) || (ep >= ep_end))
  {
  			ep = ep_first;	
  }
  		if (ep->edesc &&
  		    ep->is_stalled) {
  
  			
  
  			req.bmRequestType = UT_WRITE_ENDPOINT;
  			req.bRequest = UR_CLEAR_FEATURE;
  			USETW(req.wValue, UF_ENDPOINT_HALT);
  			req.wIndex[0] = ep->edesc->bEndpointAddress;
  			req.wIndex[1] = 0;
  			USETW(req.wLength, 0);
  
  			
  
  			usbd_copy_in(xfer->frbuffers, 0, &req, sizeof(req));
  
  			
  			usbd_xfer_set_frame_len(xfer, 0, sizeof(req));
  			xfer->nframes = 1;
  			USB_BUS_UNLOCK(udev->bus);
  
  			usbd_transfer_submit(xfer);
  
  			USB_BUS_LOCK(udev->bus);
  			break;
  		}
  		ep++;
  		to--;
  		goto tr_setup;
  
  	default:
  		if (error == USB_ERR_CANCELLED)
  {
  			break;
  }
  
  		DPRINTF("Clear stall failed.\n");
  
  		/*
  		 * Some VMs like VirtualBox always return failure on
  		 * clear-stall which we sometimes should just ignore.
  		 */
  		if (usb_no_cs_fail)
  {
  			goto tr_transferred;
  }
  		if (udev->clear_stall_errors == USB_CS_RESET_LIMIT)
  {
  			goto tr_setup;
  }
  
  		if (error == USB_ERR_TIMEOUT) {
  			udev->clear_stall_errors = USB_CS_RESET_LIMIT;
  			DPRINTF("Trying to re-enumerate.\n");
  			usbd_start_re_enumerate(udev);
  		} else {
  			udev->clear_stall_errors++;
  			if (udev->clear_stall_errors == USB_CS_RESET_LIMIT) {
  				DPRINTF("Trying to re-enumerate.\n");
  				usbd_start_re_enumerate(udev);
  			}
  		}
  		goto tr_setup;
  	}
  
  	
  	udev->ep_curr = ep;
  	USB_BUS_UNLOCK(udev->bus);
  	SDT_PROBE0(tpw, kernel, usb_request_usb_do_clear_stall_callback, return);
  }
  
  static usb_handle_req_t *
  usbd_get_hr_func(struct usb_device *udev)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_get_hr_func, entry);
  	
  	if (udev->flags.usb_mode == USB_MODE_DEVICE)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_get_hr_func, return);
  		return (usb_temp_get_desc_p);
  }
  	else if (udev->parent_hub == NULL)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_get_hr_func, return);
  		return (udev->bus->methods->roothub_exec);
  }
  	else
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_get_hr_func, return);
  		return (NULL);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_do_request_flags and usbd_do_request
   *
   * Description of arguments passed to these functions:
   *
   * "udev" - this is the "usb_device" structure pointer on which the
   * request should be performed. It is possible to call this function
   * in both Host Side mode and Device Side mode.
   *
   * "mtx" - if this argument is non-NULL the mutex pointed to by it
   * will get dropped and picked up during the execution of this
   * function, hence this function sometimes needs to sleep. If this
   * argument is NULL it has no effect.
   *
   * "req" - this argument must always be non-NULL and points to an
   * 8-byte structure holding the USB request to be done. The USB
   * request structure has a bit telling the direction of the USB
   * request, if it is a read or a write.
   *
   * "data" - if the "wLength" part of the structure pointed to by "req"
   * is non-zero this argument must point to a valid kernel buffer which
   * can hold at least "wLength" bytes. If "wLength" is zero "data" can
   * be NULL.
   *
   * "flags" - here is a list of valid flags:
   *
   *  o USB_SHORT_XFER_OK: allows the data transfer to be shorter than
   *  specified
   *
   *  o USB_DELAY_STATUS_STAGE: allows the status stage to be performed
   *  at a later point in time. This is tunable by the "hw.usb.ss_delay"
   *  sysctl. This flag is mostly useful for debugging.
   *
   *  o USB_USER_DATA_PTR: treat the "data" pointer like a userland
   *  pointer.
   *
   * "actlen" - if non-NULL the actual transfer length will be stored in
   * the 16-bit unsigned integer pointed to by "actlen". This
   * information is mostly useful when the "USB_SHORT_XFER_OK" flag is
   * used.
   *
   * "timeout" - gives the timeout for the control transfer in
   * milliseconds. A "timeout" value less than 50 milliseconds is
   * treated like a 50 millisecond timeout. A "timeout" value greater
   * than 30 seconds is treated like a 30 second timeout. This USB stack
   * does not allow control requests without a timeout.
   *
   * NOTE: This function is thread safe. All calls to "usbd_do_request_flags"
   * will be serialized by the use of the USB device enumeration lock.
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_do_request_flags(struct usb_device *udev, struct mtx *mtx,
      struct usb_device_request *req, void *data, uint16_t flags,
      uint16_t *actlen, usb_timeout_t timeout)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_do_request_flags, entry);
  #ifdef USB_REQ_DEBUG
  	struct usb_ctrl_debug_bits dbg;
  #endif
  	usb_handle_req_t *hr_func;
  	struct usb_xfer *xfer;
  	const void *desc;
  	int err = 0;
  	usb_ticks_t start_ticks;
  	usb_ticks_t delta_ticks;
  	usb_ticks_t max_ticks;
  	uint16_t length;
  	uint16_t temp;
  	uint16_t acttemp;
  	uint8_t do_unlock;
  
  	if (timeout < 50) {
  		
  		timeout = 50;
  	}
  	if (timeout > 30000) {
  		
  		timeout = 30000;
  	}
  	length = UGETW(req->wLength);
  
  	DPRINTFN(5, "udev=%p bmRequestType=0x%02x bRequest=0x%02x "
  	    "wValue=0x%02x%02x wIndex=0x%02x%02x wLength=0x%02x%02x\n",
  	    udev, req->bmRequestType, req->bRequest,
  	    req->wValue[1], req->wValue[0],
  	    req->wIndex[1], req->wIndex[0],
  	    req->wLength[1], req->wLength[0]);
  
  	
  	if (udev->state < USB_STATE_POWERED) {
  		DPRINTF("usb device has gone\n");
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_do_request_flags, return);
  		return (USB_ERR_NOT_CONFIGURED);
  	}
  
  	/*
  	 * Set "actlen" to a known value in case the caller does not
  	 * check the return value:
  	 */
  	if (actlen)
  {
  		*actlen = 0;
  }
  
  #if (USB_HAVE_USER_IO == 0)
  	if (flags & USB_USER_DATA_PTR)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_do_request_flags, return);
  		return (USB_ERR_INVAL);
  }
  #endif
  	if ((mtx != NULL) && (mtx != &Giant)) {
  		mtx_unlock(mtx);
  		mtx_assert(mtx, MA_NOTOWNED);
  	}
  
  	/*
  	 * Serialize access to this function:
  	 */
  	do_unlock = usbd_ctrl_lock(udev);
  
  	hr_func = usbd_get_hr_func(udev);
  
  	if (hr_func != NULL) {
  		DPRINTF("Handle Request function is set\n");
  
  		desc = NULL;
  		temp = 0;
  
  		if (!(req->bmRequestType & UT_READ)) {
  			if (length != 0) {
  				DPRINTFN(1, "The handle request function "
  				    "does not support writing data!\n");
  				err = USB_ERR_INVAL;
  				goto done;
  			}
  		}
  
  		
  
  		USB_BUS_LOCK(udev->bus);
  		err = (hr_func) (udev, req, &desc, &temp);
  		USB_BUS_UNLOCK(udev->bus);
  
  		if (err)
  {
  			goto done;
  }
  
  		if (length > temp) {
  			if (!(flags & USB_SHORT_XFER_OK)) {
  				err = USB_ERR_SHORT_XFER;
  				goto done;
  			}
  			length = temp;
  		}
  		if (actlen)
  {
  			*actlen = length;
  }
  
  		if (length > 0) {
  #if USB_HAVE_USER_IO
  			if (flags & USB_USER_DATA_PTR) {
  				if (copyout(desc, data, length)) {
  					err = USB_ERR_INVAL;
  					goto done;
  				}
  			} else
  #endif
  				memcpy(data, desc, length);
  		}
  		goto done;		
  	}
  
  	/*
  	 * Setup a new USB transfer or use the existing one, if any:
  	 */
  	usbd_ctrl_transfer_setup(udev);
  
  	xfer = udev->ctrl_xfer[0];
  	if (xfer == NULL) {
  		
  		err = USB_ERR_NOMEM;
  		goto done;
  	}
  
  #ifdef USB_REQ_DEBUG
  	
  	usbd_get_debug_bits(udev, req, &dbg);
  
  	
  	if (dbg.enabled)
  {
  		flags |= USB_DELAY_STATUS_STAGE;
  }
  #endif
  	USB_XFER_LOCK(xfer);
  
  	if (flags & USB_DELAY_STATUS_STAGE)
  {
  		xfer->flags.manual_status = 1;
  }
  	else
  		xfer->flags.manual_status = 0;
  
  	if (flags & USB_SHORT_XFER_OK)
  {
  		xfer->flags.short_xfer_ok = 1;
  }
  	else
  		xfer->flags.short_xfer_ok = 0;
  
  	xfer->timeout = timeout;
  
  	start_ticks = ticks;
  
  	max_ticks = USB_MS_TO_TICKS(timeout);
  
  	usbd_copy_in(xfer->frbuffers, 0, req, sizeof(*req));
  
  	usbd_xfer_set_frame_len(xfer, 0, sizeof(*req));
  
  	while (1) {
  		temp = length;
  		if (temp > usbd_xfer_max_len(xfer)) {
  			temp = usbd_xfer_max_len(xfer);
  		}
  #ifdef USB_REQ_DEBUG
  		if (xfer->flags.manual_status) {
  			if (usbd_xfer_frame_len(xfer, 0) != 0) {
  				
  				temp = 0;
  			} else if (temp > 0) {
  				if (dbg.ds_fail) {
  					err = USB_ERR_INVAL;
  					break;
  				}
  				if (dbg.ds_delay > 0) {
  					usb_pause_mtx(
  					    xfer->xroot->xfer_mtx,
  				            USB_MS_TO_TICKS(dbg.ds_delay));
  					
  					start_ticks = ticks;
  				}
  			}
  		}
  #endif
  		usbd_xfer_set_frame_len(xfer, 1, temp);
  
  		if (temp > 0) {
  			if (!(req->bmRequestType & UT_READ)) {
  #if USB_HAVE_USER_IO
  				if (flags & USB_USER_DATA_PTR) {
  					USB_XFER_UNLOCK(xfer);
  					err = usbd_copy_in_user(xfer->frbuffers + 1,
  					    0, data, temp);
  					USB_XFER_LOCK(xfer);
  					if (err) {
  						err = USB_ERR_INVAL;
  						break;
  					}
  				} else
  #endif
  					usbd_copy_in(xfer->frbuffers + 1,
  					    0, data, temp);
  			}
  			usbd_xfer_set_frames(xfer, 2);
  		} else {
  			if (usbd_xfer_frame_len(xfer, 0) == 0) {
  				if (xfer->flags.manual_status) {
  #ifdef USB_REQ_DEBUG
  					if (dbg.ss_fail) {
  						err = USB_ERR_INVAL;
  						break;
  					}
  					if (dbg.ss_delay > 0) {
  						usb_pause_mtx(
  						    xfer->xroot->xfer_mtx,
  						    USB_MS_TO_TICKS(dbg.ss_delay));
  						
  						start_ticks = ticks;
  					}
  #endif
  					xfer->flags.manual_status = 0;
  				} else {
  					break;
  				}
  			}
  			usbd_xfer_set_frames(xfer, 1);
  		}
  
  		usbd_transfer_start(xfer);
  
  		while (usbd_transfer_pending(xfer)) {
  			cv_wait(&udev->ctrlreq_cv,
  			    xfer->xroot->xfer_mtx);
  		}
  
  		err = xfer->error;
  
  		if (err) {
  			break;
  		}
  
  		
  
  		if (xfer->aframes < 2) {
  			acttemp = 0;
  		} else {
  			acttemp = usbd_xfer_frame_len(xfer, 1);
  		}
  
  		
  
  		if (temp > acttemp) {
  			temp = acttemp;
  			length = temp;
  		}
  		if (temp > 0) {
  			if (req->bmRequestType & UT_READ) {
  #if USB_HAVE_USER_IO
  				if (flags & USB_USER_DATA_PTR) {
  					USB_XFER_UNLOCK(xfer);
  					err = usbd_copy_out_user(xfer->frbuffers + 1,
  					    0, data, temp);
  					USB_XFER_LOCK(xfer);
  					if (err) {
  						err = USB_ERR_INVAL;
  						break;
  					}
  				} else
  #endif
  					usbd_copy_out(xfer->frbuffers + 1,
  					    0, data, temp);
  			}
  		}
  		/*
  		 * Clear "frlengths[0]" so that we don't send the setup
  		 * packet again:
  		 */
  		usbd_xfer_set_frame_len(xfer, 0, 0);
  
  		
  		length -= temp;
  		data = USB_ADD_BYTES(data, temp);
  
  		if (actlen) {
  			(*actlen) += temp;
  		}
  		
  
  		delta_ticks = ticks - start_ticks;
  		if (delta_ticks > max_ticks) {
  			if (!err) {
  				err = USB_ERR_TIMEOUT;
  			}
  		}
  		if (err) {
  			break;
  		}
  	}
  
  	if (err) {
  		/*
  		 * Make sure that the control endpoint is no longer
  		 * blocked in case of a non-transfer related error:
  		 */
  		usbd_transfer_stop(xfer);
  	}
  	USB_XFER_UNLOCK(xfer);
  
  done:
  	if (do_unlock)
  {
  		usbd_ctrl_unlock(udev);
  }
  
  	if ((mtx != NULL) && (mtx != &Giant))
  {
  		mtx_lock(mtx);
  }
  
  	switch (err) {
  	case USB_ERR_NORMAL_COMPLETION:
  	case USB_ERR_SHORT_XFER:
  	case USB_ERR_STALLED:
  	case USB_ERR_CANCELLED:
  		break;
  	default:
  		DPRINTF("I/O error - waiting a bit for TT cleanup\n");
  		usb_pause_mtx(mtx, hz / 16);
  		break;
  	}
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_do_request_flags, return);
  	return ((usb_error_t)err);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_do_request_proc - factored out code
   *
   * This function is factored out code. It does basically the same like
   * usbd_do_request_flags, except it will check the status of the
   * passed process argument before doing the USB request. If the
   * process is draining the USB_ERR_IOERROR code will be returned. It
   * is assumed that the mutex associated with the process is locked
   * when calling this function.
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_do_request_proc(struct usb_device *udev, struct usb_process *pproc,
      struct usb_device_request *req, void *data, uint16_t flags,
      uint16_t *actlen, usb_timeout_t timeout)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_do_request_proc, entry);
  	usb_error_t err;
  	uint16_t len;
  
  	
  	len = UGETW(req->wLength);
  
  	
  	if (usb_proc_is_gone(pproc)) {
  		err = USB_ERR_IOERROR;
  		goto done;
  	}
  
  	
  	err = usbd_do_request_flags(udev, pproc->up_mtx,
  	    req, data, flags, actlen, timeout);
  
  done:
  	
  	
  	if ((len != 0) && (req->bmRequestType & UE_DIR_IN)) {
  		if (err)
  {
  			memset(data, 0, len);
  }
  		else if (actlen && *actlen != len)
  {
  			memset(((uint8_t *)data) + *actlen, 0, len - *actlen);
  }
  	}
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_do_request_proc, return);
  	return (err);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_reset_port
   *
   * This function will instruct a USB HUB to perform a reset sequence
   * on the specified port number.
   *
   * Returns:
   *    0: Success. The USB device should now be at address zero.
   * Else: Failure. No USB device is present and the USB port should be
   *       disabled.
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_reset_port(struct usb_device *udev, struct mtx *mtx, uint8_t port)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_reset_port, entry);
  	struct usb_port_status ps;
  	usb_error_t err;
  	uint16_t n;
  	uint16_t status;
  	uint16_t change;
  
  	DPRINTF("\n");
  
  	
  	usbd_req_clear_port_feature(
  	    udev, mtx, port, UHF_C_PORT_RESET);
  
  	
  	err = usbd_req_set_port_feature(
  	    udev, mtx, port, UHF_PORT_RESET);
  
  	
  	if (err)
  {
  		goto done;
  }
  	n = 0;
  	while (1) {
  		
  		usb_pause_mtx(mtx, USB_MS_TO_TICKS(usb_port_reset_delay));
  		n += usb_port_reset_delay;
  		err = usbd_req_get_port_status(udev, mtx, &ps, port);
  		if (err)
  {
  			goto done;
  }
  
  		status = UGETW(ps.wPortStatus);
  		change = UGETW(ps.wPortChange);
  
  		
  		if (!(status & UPS_CURRENT_CONNECT_STATUS))
  {
  			goto done;
  }
  
  		
  		if (change & UPS_C_PORT_RESET)
  {
  			break;
  }
  
  		/*
  		 * Some Virtual Machines like VirtualBox 4.x fail to
  		 * generate a port reset change event. Check if reset
  		 * is no longer asserted.
  		 */
  		if (!(status & UPS_RESET))
  {
  			break;
  }
  
  		
  		if (n > 1000) {
  			n = 0;
  			break;
  		}
  	}
  
  	
  	err = usbd_req_clear_port_feature(
  	    udev, mtx, port, UHF_C_PORT_RESET);
  	if (err)
  {
  		goto done;
  }
  
  	
  	if (n == 0) {
  		err = USB_ERR_TIMEOUT;
  		goto done;
  	}
  	
  	usb_pause_mtx(mtx, USB_MS_TO_TICKS(usb_port_reset_recovery));
  
  done:
  	DPRINTFN(2, "port %d reset returning error=%s\n",
  	    port, usbd_errstr(err));
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_reset_port, return);
  	return (err);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_warm_reset_port
   *
   * This function will instruct an USB HUB to perform a warm reset
   * sequence on the specified port number. This kind of reset is not
   * mandatory for LOW-, FULL- and HIGH-speed USB HUBs and is targeted
   * for SUPER-speed USB HUBs.
   *
   * Returns:
   *    0: Success. The USB device should now be available again.
   * Else: Failure. No USB device is present and the USB port should be
   *       disabled.
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_warm_reset_port(struct usb_device *udev, struct mtx *mtx,
      uint8_t port)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_warm_reset_port, entry);
  	struct usb_port_status ps;
  	usb_error_t err;
  	uint16_t n;
  	uint16_t status;
  	uint16_t change;
  
  	DPRINTF("\n");
  
  	err = usbd_req_get_port_status(udev, mtx, &ps, port);
  	if (err)
  {
  		goto done;
  }
  
  	status = UGETW(ps.wPortStatus);
  
  	switch (UPS_PORT_LINK_STATE_GET(status)) {
  	case UPS_PORT_LS_U3:
  	case UPS_PORT_LS_COMP_MODE:
  	case UPS_PORT_LS_LOOPBACK:
  	case UPS_PORT_LS_SS_INA:
  		break;
  	default:
  		DPRINTF("Wrong state for warm reset\n");
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_warm_reset_port, return);
  		return (0);
  	}
  
  	
  	usbd_req_clear_port_feature(udev, mtx,
  	    port, UHF_C_BH_PORT_RESET);
  
  	
  	err = usbd_req_set_port_feature(udev, mtx,
  	    port, UHF_BH_PORT_RESET);
  	if (err)
  {
  		goto done;
  }
  
  	n = 0;
  	while (1) {
  		
  		usb_pause_mtx(mtx, USB_MS_TO_TICKS(usb_port_reset_delay));
  		n += usb_port_reset_delay;
  		err = usbd_req_get_port_status(udev, mtx, &ps, port);
  		if (err)
  {
  			goto done;
  }
  
  		status = UGETW(ps.wPortStatus);
  		change = UGETW(ps.wPortChange);
  
  		
  		if (!(status & UPS_CURRENT_CONNECT_STATUS))
  {
  			goto done;
  }
  
  		
  		if (change & UPS_C_BH_PORT_RESET)
  {
  			break;
  }
  
  		
  		if (n > 1000) {
  			n = 0;
  			break;
  		}
  	}
  
  	
  	err = usbd_req_clear_port_feature(
  	    udev, mtx, port, UHF_C_BH_PORT_RESET);
  	if (err)
  {
  		goto done;
  }
  
  	
  	if (n == 0) {
  		err = USB_ERR_TIMEOUT;
  		goto done;
  	}
  	
  	usb_pause_mtx(mtx, USB_MS_TO_TICKS(usb_port_reset_recovery));
  
  done:
  	DPRINTFN(2, "port %d warm reset returning error=%s\n",
  	    port, usbd_errstr(err));
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_warm_reset_port, return);
  	return (err);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_desc
   *
   * This function can be used to retrieve USB descriptors. It contains
   * some additional logic like zeroing of missing descriptor bytes and
   * retrying an USB descriptor in case of failure. The "min_len"
   * argument specifies the minimum descriptor length. The "max_len"
   * argument specifies the maximum descriptor length. If the real
   * descriptor length is less than the minimum length the missing
   * byte(s) will be zeroed. The type field, the second byte of the USB
   * descriptor, will get forced to the correct type. If the "actlen"
   * pointer is non-NULL, the actual length of the transfer will get
   * stored in the 16-bit unsigned integer which it is pointing to. The
   * first byte of the descriptor will not get updated. If the "actlen"
   * pointer is NULL the first byte of the descriptor will get updated
   * to reflect the actual length instead. If "min_len" is not equal to
   * "max_len" then this function will try to retrive the beginning of
   * the descriptor and base the maximum length on the first byte of the
   * descriptor.
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_desc(struct usb_device *udev,
      struct mtx *mtx, uint16_t *actlen, void *desc,
      uint16_t min_len, uint16_t max_len,
      uint16_t id, uint8_t type, uint8_t index,
      uint8_t retries)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_desc, entry);
  	struct usb_device_request req;
  	uint8_t *buf;
  	usb_error_t err;
  
  	DPRINTFN(4, "id=%d, type=%d, index=%d, max_len=%d\n",
  	    id, type, index, max_len);
  
  	req.bmRequestType = UT_READ_DEVICE;
  	req.bRequest = UR_GET_DESCRIPTOR;
  	USETW2(req.wValue, type, index);
  	USETW(req.wIndex, id);
  
  	while (1) {
  
  		if ((min_len < 2) || (max_len < 2)) {
  			err = USB_ERR_INVAL;
  			goto done;
  		}
  		USETW(req.wLength, min_len);
  
  		err = usbd_do_request_flags(udev, mtx, &req,
  		    desc, 0, NULL, 500 /* ms */);
  
  		if (err) {
  			if (!retries) {
  				goto done;
  			}
  			retries--;
  
  			usb_pause_mtx(mtx, hz / 5);
  
  			continue;
  		}
  		buf = desc;
  
  		if (min_len == max_len) {
  
  			
  			if ((buf[0] > min_len) && (actlen == NULL))
  {
  				buf[0] = min_len;
  }
  
  			
  			buf[1] = type;
  
  			goto done;
  		}
  		
  
  		if (max_len > buf[0]) {
  			max_len = buf[0];
  		}
  		
  
  		while (min_len > max_len) {
  			min_len--;
  			buf[min_len] = 0;
  		}
  
  		
  
  		min_len = max_len;
  	}
  done:
  	if (actlen != NULL) {
  		if (err)
  {
  			*actlen = 0;
  }
  		else
  			*actlen = min_len;
  	}
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_desc, return);
  	return (err);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_string_any
   *
   * This function will return the string given by "string_index"
   * using the first language ID. The maximum length "len" includes
   * the terminating zero. The "len" argument should be twice as
   * big pluss 2 bytes, compared with the actual maximum string length !
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_string_any(struct usb_device *udev, struct mtx *mtx, char *buf,
      uint16_t len, uint8_t string_index)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_string_any, entry);
  	char *s;
  	uint8_t *temp;
  	uint16_t i;
  	uint16_t n;
  	uint16_t c;
  	uint8_t swap;
  	usb_error_t err;
  
  	if (len == 0) {
  		
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_string_any, return);
  		return (USB_ERR_NORMAL_COMPLETION);
  	}
  	if (string_index == 0) {
  		
  		buf[0] = 0;
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_string_any, return);
  		return (USB_ERR_INVAL);
  	}
  	if (udev->flags.no_strings) {
  		buf[0] = 0;
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_string_any, return);
  		return (USB_ERR_STALLED);
  	}
  	err = usbd_req_get_string_desc
  	    (udev, mtx, buf, len, udev->langid, string_index);
  	if (err) {
  		buf[0] = 0;
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_string_any, return);
  		return (err);
  	}
  	temp = (uint8_t *)buf;
  
  	if (temp[0] < 2) {
  		
  		buf[0] = 0;
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_string_any, return);
  		return (USB_ERR_INVAL);
  	}
  	
  	len--;
  
  	
  	s = buf;
  	n = (temp[0] / 2) - 1;
  	if (n > len) {
  		n = len;
  	}
  	
  	temp += 2;
  
  	
  	swap = 3;
  
  	
  	for (i = 0; (i != n); i++) {
  		c = UGETW(temp + (2 * i));
  
  		
  		if (((c & 0xff00) == 0) && (swap & 1)) {
  			
  			*s = c;
  			swap = 1;
  		} else if (((c & 0x00ff) == 0) && (swap & 2)) {
  			
  			*s = c >> 8;
  			swap = 2;
  		} else {
  			
  			continue;
  		}
  
  		/*
  		 * Filter by default - We only allow alphanumerical
  		 * and a few more to avoid any problems with scripts
  		 * and daemons.
  		 */
  		if (isalpha(*s) ||
  		    isdigit(*s) ||
  		    *s == '-' ||
  		    *s == '+' ||
  		    *s == ' ' ||
  		    *s == '.' ||
  		    *s == ',') {
  			
  			s++;
  		}
  		
  	}
  	*s = 0;				
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_string_any, return);
  	return (USB_ERR_NORMAL_COMPLETION);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_string_desc
   *
   * If you don't know the language ID, consider using
   * "usbd_req_get_string_any()".
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_string_desc(struct usb_device *udev, struct mtx *mtx, void *sdesc,
      uint16_t max_len, uint16_t lang_id,
      uint8_t string_index)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_string_desc, entry);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_string_desc, return);
  	return (usbd_req_get_desc(udev, mtx, NULL, sdesc, 2, max_len, lang_id,
  	    UDESC_STRING, string_index, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_config_desc_ptr
   *
   * This function is used in device side mode to retrieve the pointer
   * to the generated config descriptor. This saves allocating space for
   * an additional config descriptor when setting the configuration.
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_descriptor_ptr(struct usb_device *udev,
      struct usb_config_descriptor **ppcd, uint16_t wValue)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_descriptor_ptr, entry);
  	struct usb_device_request req;
  	usb_handle_req_t *hr_func;
  	const void *ptr;
  	uint16_t len;
  	usb_error_t err;
  
  	req.bmRequestType = UT_READ_DEVICE;
  	req.bRequest = UR_GET_DESCRIPTOR;
  	USETW(req.wValue, wValue);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, 0);
  
  	ptr = NULL;
  	len = 0;
  
  	hr_func = usbd_get_hr_func(udev);
  
  	if (hr_func == NULL)
  {
  		err = USB_ERR_INVAL;
  }
  	else {
  		USB_BUS_LOCK(udev->bus);
  		err = (hr_func) (udev, &req, &ptr, &len);
  		USB_BUS_UNLOCK(udev->bus);
  	}
  
  	if (err)
  {
  		ptr = NULL;
  }
  	else if (ptr == NULL)
  {
  		err = USB_ERR_INVAL;
  }
  
  	*ppcd = __DECONST(struct usb_config_descriptor *, ptr);
  
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_descriptor_ptr, return);
  	return (err);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_config_desc
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_config_desc(struct usb_device *udev, struct mtx *mtx,
      struct usb_config_descriptor *d, uint8_t conf_index)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_config_desc, entry);
  	usb_error_t err;
  
  	DPRINTFN(4, "confidx=%d\n", conf_index);
  
  	err = usbd_req_get_desc(udev, mtx, NULL, d, sizeof(*d),
  	    sizeof(*d), 0, UDESC_CONFIG, conf_index, 0);
  	if (err) {
  		goto done;
  	}
  	
  	if (UGETW(d->wTotalLength) < (uint16_t)sizeof(*d)) {
  		err = USB_ERR_INVAL;
  	}
  done:
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_config_desc, return);
  	return (err);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_alloc_config_desc
   *
   * This function is used to allocate a zeroed configuration
   * descriptor.
   *
   * Returns:
   * NULL: Failure
   * Else: Success
   *------------------------------------------------------------------------*/
  void *
  usbd_alloc_config_desc(struct usb_device *udev, uint32_t size)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_alloc_config_desc, entry);
  	if (size > USB_CONFIG_MAX) {
  		DPRINTF("Configuration descriptor too big\n");
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_alloc_config_desc, return);
  		return (NULL);
  	}
  #if (USB_HAVE_FIXED_CONFIG == 0)
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_alloc_config_desc, return);
  	return (malloc(size, M_USBDEV, M_ZERO | M_WAITOK));
  #else
  	memset(udev->config_data, 0, sizeof(udev->config_data));
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_alloc_config_desc, return);
  	return (udev->config_data);
  #endif
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_alloc_config_desc
   *
   * This function is used to free a configuration descriptor.
   *------------------------------------------------------------------------*/
  void
  usbd_free_config_desc(struct usb_device *udev, void *ptr)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_free_config_desc, entry);
  #if (USB_HAVE_FIXED_CONFIG == 0)
  	free(ptr, M_USBDEV);
  #endif
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_free_config_desc, return);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_config_desc_full
   *
   * This function gets the complete USB configuration descriptor and
   * ensures that "wTotalLength" is correct. The returned configuration
   * descriptor is freed by calling "usbd_free_config_desc()".
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_config_desc_full(struct usb_device *udev, struct mtx *mtx,
      struct usb_config_descriptor **ppcd, uint8_t index)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_config_desc_full, entry);
  	struct usb_config_descriptor cd;
  	struct usb_config_descriptor *cdesc;
  	uint32_t len;
  	usb_error_t err;
  
  	DPRINTFN(4, "index=%d\n", index);
  
  	*ppcd = NULL;
  
  	err = usbd_req_get_config_desc(udev, mtx, &cd, index);
  	if (err)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_config_desc_full, return);
  		return (err);
  }
  
  	
  	len = UGETW(cd.wTotalLength);
  	if (len < (uint32_t)sizeof(*cdesc)) {
  		
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_config_desc_full, return);
  		return (USB_ERR_INVAL);
  	} else if (len > USB_CONFIG_MAX) {
  		DPRINTF("Configuration descriptor was truncated\n");
  		len = USB_CONFIG_MAX;
  	}
  	cdesc = usbd_alloc_config_desc(udev, len);
  	if (cdesc == NULL)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_config_desc_full, return);
  		return (USB_ERR_NOMEM);
  }
  	err = usbd_req_get_desc(udev, mtx, NULL, cdesc, len, len, 0,
  	    UDESC_CONFIG, index, 3);
  	if (err) {
  		usbd_free_config_desc(udev, cdesc);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_config_desc_full, return);
  		return (err);
  	}
  	
  	USETW(cdesc->wTotalLength, len);
  
  	*ppcd = cdesc;
  
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_config_desc_full, return);
  	return (0);			
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_device_desc
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_device_desc(struct usb_device *udev, struct mtx *mtx,
      struct usb_device_descriptor *d)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_device_desc, entry);
  	DPRINTFN(4, "\n");
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_device_desc, return);
  	return (usbd_req_get_desc(udev, mtx, NULL, d, sizeof(*d),
  	    sizeof(*d), 0, UDESC_DEVICE, 0, 3));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_alt_interface_no
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_alt_interface_no(struct usb_device *udev, struct mtx *mtx,
      uint8_t *alt_iface_no, uint8_t iface_index)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_alt_interface_no, entry);
  	struct usb_interface *iface = usbd_get_iface(udev, iface_index);
  	struct usb_device_request req;
  
  	if ((iface == NULL) || (iface->idesc == NULL))
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_alt_interface_no, return);
  		return (USB_ERR_INVAL);
  }
  
  	req.bmRequestType = UT_READ_INTERFACE;
  	req.bRequest = UR_GET_INTERFACE;
  	USETW(req.wValue, 0);
  	req.wIndex[0] = iface->idesc->bInterfaceNumber;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, 1);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_alt_interface_no, return);
  	return (usbd_do_request(udev, mtx, &req, alt_iface_no));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_alt_interface_no
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_alt_interface_no(struct usb_device *udev, struct mtx *mtx,
      uint8_t iface_index, uint8_t alt_no)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_alt_interface_no, entry);
  	struct usb_interface *iface = usbd_get_iface(udev, iface_index);
  	struct usb_device_request req;
  
  	if ((iface == NULL) || (iface->idesc == NULL))
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_alt_interface_no, return);
  		return (USB_ERR_INVAL);
  }
  
  	req.bmRequestType = UT_WRITE_INTERFACE;
  	req.bRequest = UR_SET_INTERFACE;
  	req.wValue[0] = alt_no;
  	req.wValue[1] = 0;
  	req.wIndex[0] = iface->idesc->bInterfaceNumber;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_alt_interface_no, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_device_status
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_device_status(struct usb_device *udev, struct mtx *mtx,
      struct usb_status *st)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_device_status, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_READ_DEVICE;
  	req.bRequest = UR_GET_STATUS;
  	USETW(req.wValue, 0);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, sizeof(*st));
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_device_status, return);
  	return (usbd_do_request(udev, mtx, &req, st));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_hub_descriptor
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_hub_descriptor(struct usb_device *udev, struct mtx *mtx,
      struct usb_hub_descriptor *hd, uint8_t nports)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_hub_descriptor, entry);
  	struct usb_device_request req;
  	uint16_t len = (nports + 7 + (8 * 8)) / 8;
  
  	req.bmRequestType = UT_READ_CLASS_DEVICE;
  	req.bRequest = UR_GET_DESCRIPTOR;
  	USETW2(req.wValue, UDESC_HUB, 0);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, len);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_hub_descriptor, return);
  	return (usbd_do_request(udev, mtx, &req, hd));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_ss_hub_descriptor
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_ss_hub_descriptor(struct usb_device *udev, struct mtx *mtx,
      struct usb_hub_ss_descriptor *hd, uint8_t nports)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_ss_hub_descriptor, entry);
  	struct usb_device_request req;
  	uint16_t len = sizeof(*hd) - 32 + 1 + ((nports + 7) / 8);
  
  	req.bmRequestType = UT_READ_CLASS_DEVICE;
  	req.bRequest = UR_GET_DESCRIPTOR;
  	USETW2(req.wValue, UDESC_SS_HUB, 0);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, len);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_ss_hub_descriptor, return);
  	return (usbd_do_request(udev, mtx, &req, hd));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_hub_status
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_hub_status(struct usb_device *udev, struct mtx *mtx,
      struct usb_hub_status *st)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_hub_status, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_READ_CLASS_DEVICE;
  	req.bRequest = UR_GET_STATUS;
  	USETW(req.wValue, 0);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, sizeof(struct usb_hub_status));
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_hub_status, return);
  	return (usbd_do_request(udev, mtx, &req, st));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_address
   *
   * This function is used to set the address for an USB device. After
   * port reset the USB device will respond at address zero.
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_address(struct usb_device *udev, struct mtx *mtx, uint16_t addr)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_address, entry);
  	struct usb_device_request req;
  	usb_error_t err;
  
  	DPRINTFN(6, "setting device address=%d\n", addr);
  
  	req.bmRequestType = UT_WRITE_DEVICE;
  	req.bRequest = UR_SET_ADDRESS;
  	USETW(req.wValue, addr);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, 0);
  
  	err = USB_ERR_INVAL;
  
  	
  	if (udev->bus->methods->set_address != NULL)
  {
  		err = (udev->bus->methods->set_address) (udev, mtx, addr);
  }
  
  	if (err != USB_ERR_INVAL)
  {
  		goto done;
  }
  
  	
  	err = usbd_do_request_flags(udev, mtx, &req, NULL,
  	    USB_DELAY_STATUS_STAGE, NULL, 1000);
  
  done:
  	
  	usb_pause_mtx(mtx,
  	    USB_MS_TO_TICKS(usb_set_address_settle));
  
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_address, return);
  	return (err);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_port_status
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_port_status(struct usb_device *udev, struct mtx *mtx,
      struct usb_port_status *ps, uint8_t port)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_port_status, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_READ_CLASS_OTHER;
  	req.bRequest = UR_GET_STATUS;
  	USETW(req.wValue, 0);
  	req.wIndex[0] = port;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, sizeof *ps);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_port_status, return);
  	return (usbd_do_request(udev, mtx, &req, ps));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_clear_hub_feature
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_clear_hub_feature(struct usb_device *udev, struct mtx *mtx,
      uint16_t sel)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_clear_hub_feature, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_CLASS_DEVICE;
  	req.bRequest = UR_CLEAR_FEATURE;
  	USETW(req.wValue, sel);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_clear_hub_feature, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_hub_feature
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_hub_feature(struct usb_device *udev, struct mtx *mtx,
      uint16_t sel)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_hub_feature, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_CLASS_DEVICE;
  	req.bRequest = UR_SET_FEATURE;
  	USETW(req.wValue, sel);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_hub_feature, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_hub_u1_timeout
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_hub_u1_timeout(struct usb_device *udev, struct mtx *mtx,
      uint8_t port, uint8_t timeout)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_hub_u1_timeout, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_CLASS_OTHER;
  	req.bRequest = UR_SET_FEATURE;
  	USETW(req.wValue, UHF_PORT_U1_TIMEOUT);
  	req.wIndex[0] = port;
  	req.wIndex[1] = timeout;
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_hub_u1_timeout, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_hub_u2_timeout
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_hub_u2_timeout(struct usb_device *udev, struct mtx *mtx,
      uint8_t port, uint8_t timeout)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_hub_u2_timeout, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_CLASS_OTHER;
  	req.bRequest = UR_SET_FEATURE;
  	USETW(req.wValue, UHF_PORT_U2_TIMEOUT);
  	req.wIndex[0] = port;
  	req.wIndex[1] = timeout;
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_hub_u2_timeout, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_hub_depth
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_hub_depth(struct usb_device *udev, struct mtx *mtx,
      uint16_t depth)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_hub_depth, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_CLASS_DEVICE;
  	req.bRequest = UR_SET_HUB_DEPTH;
  	USETW(req.wValue, depth);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_hub_depth, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_clear_port_feature
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_clear_port_feature(struct usb_device *udev, struct mtx *mtx,
      uint8_t port, uint16_t sel)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_clear_port_feature, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_CLASS_OTHER;
  	req.bRequest = UR_CLEAR_FEATURE;
  	USETW(req.wValue, sel);
  	req.wIndex[0] = port;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_clear_port_feature, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_port_feature
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_port_feature(struct usb_device *udev, struct mtx *mtx,
      uint8_t port, uint16_t sel)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_port_feature, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_CLASS_OTHER;
  	req.bRequest = UR_SET_FEATURE;
  	USETW(req.wValue, sel);
  	req.wIndex[0] = port;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_port_feature, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_protocol
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_protocol(struct usb_device *udev, struct mtx *mtx,
      uint8_t iface_index, uint16_t report)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_protocol, entry);
  	struct usb_interface *iface = usbd_get_iface(udev, iface_index);
  	struct usb_device_request req;
  
  	if ((iface == NULL) || (iface->idesc == NULL)) {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_protocol, return);
  		return (USB_ERR_INVAL);
  	}
  	DPRINTFN(5, "iface=%p, report=%d, endpt=%d\n",
  	    iface, report, iface->idesc->bInterfaceNumber);
  
  	req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
  	req.bRequest = UR_SET_PROTOCOL;
  	USETW(req.wValue, report);
  	req.wIndex[0] = iface->idesc->bInterfaceNumber;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_protocol, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_report
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_report(struct usb_device *udev, struct mtx *mtx, void *data, uint16_t len,
      uint8_t iface_index, uint8_t type, uint8_t id)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_report, entry);
  	struct usb_interface *iface = usbd_get_iface(udev, iface_index);
  	struct usb_device_request req;
  
  	if ((iface == NULL) || (iface->idesc == NULL)) {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_report, return);
  		return (USB_ERR_INVAL);
  	}
  	DPRINTFN(5, "len=%d\n", len);
  
  	req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
  	req.bRequest = UR_SET_REPORT;
  	USETW2(req.wValue, type, id);
  	req.wIndex[0] = iface->idesc->bInterfaceNumber;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, len);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_report, return);
  	return (usbd_do_request(udev, mtx, &req, data));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_report
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_report(struct usb_device *udev, struct mtx *mtx, void *data,
      uint16_t len, uint8_t iface_index, uint8_t type, uint8_t id)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_report, entry);
  	struct usb_interface *iface = usbd_get_iface(udev, iface_index);
  	struct usb_device_request req;
  
  	if ((iface == NULL) || (iface->idesc == NULL)) {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_report, return);
  		return (USB_ERR_INVAL);
  	}
  	DPRINTFN(5, "len=%d\n", len);
  
  	req.bmRequestType = UT_READ_CLASS_INTERFACE;
  	req.bRequest = UR_GET_REPORT;
  	USETW2(req.wValue, type, id);
  	req.wIndex[0] = iface->idesc->bInterfaceNumber;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, len);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_report, return);
  	return (usbd_do_request(udev, mtx, &req, data));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_idle
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_idle(struct usb_device *udev, struct mtx *mtx,
      uint8_t iface_index, uint8_t duration, uint8_t id)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_idle, entry);
  	struct usb_interface *iface = usbd_get_iface(udev, iface_index);
  	struct usb_device_request req;
  
  	if ((iface == NULL) || (iface->idesc == NULL)) {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_idle, return);
  		return (USB_ERR_INVAL);
  	}
  	DPRINTFN(5, "%d %d\n", duration, id);
  
  	req.bmRequestType = UT_WRITE_CLASS_INTERFACE;
  	req.bRequest = UR_SET_IDLE;
  	USETW2(req.wValue, duration, id);
  	req.wIndex[0] = iface->idesc->bInterfaceNumber;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_idle, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_report_descriptor
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_report_descriptor(struct usb_device *udev, struct mtx *mtx,
      void *d, uint16_t size, uint8_t iface_index)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_report_descriptor, entry);
  	struct usb_interface *iface = usbd_get_iface(udev, iface_index);
  	struct usb_device_request req;
  
  	if ((iface == NULL) || (iface->idesc == NULL)) {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_report_descriptor, return);
  		return (USB_ERR_INVAL);
  	}
  	req.bmRequestType = UT_READ_INTERFACE;
  	req.bRequest = UR_GET_DESCRIPTOR;
  	USETW2(req.wValue, UDESC_REPORT, 0);	
  	req.wIndex[0] = iface->idesc->bInterfaceNumber;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, size);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_report_descriptor, return);
  	return (usbd_do_request(udev, mtx, &req, d));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_config
   *
   * This function is used to select the current configuration number in
   * both USB device side mode and USB host side mode. When setting the
   * configuration the function of the interfaces can change.
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_config(struct usb_device *udev, struct mtx *mtx, uint8_t conf)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_config, entry);
  	struct usb_device_request req;
  
  	DPRINTF("setting config %d\n", conf);
  
  	
  
  	req.bmRequestType = UT_WRITE_DEVICE;
  	req.bRequest = UR_SET_CONFIG;
  	req.wValue[0] = conf;
  	req.wValue[1] = 0;
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_config, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_get_config
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_get_config(struct usb_device *udev, struct mtx *mtx, uint8_t *pconf)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_config, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_READ_DEVICE;
  	req.bRequest = UR_GET_CONFIG;
  	USETW(req.wValue, 0);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, 1);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_get_config, return);
  	return (usbd_do_request(udev, mtx, &req, pconf));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_setup_device_desc
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_setup_device_desc(struct usb_device *udev, struct mtx *mtx)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_setup_device_desc, entry);
  	usb_error_t err;
  
  	/*
  	 * Get the first 8 bytes of the device descriptor !
  	 *
  	 * NOTE: "usbd_do_request()" will check the device descriptor
  	 * next time we do a request to see if the maximum packet size
  	 * changed! The 8 first bytes of the device descriptor
  	 * contains the maximum packet size to use on control endpoint
  	 * 0. If this value is different from "USB_MAX_IPACKET" a new
  	 * USB control request will be setup!
  	 */
  	switch (udev->speed) {
  	case USB_SPEED_FULL:
  		if (usb_full_ddesc != 0) {
  			
  			err = usbd_req_get_device_desc(udev, mtx, &udev->ddesc);
  			if (err == 0)
  {
  				break;
  }
  		}
  
  		
  		err = usbd_req_get_desc(udev, mtx, NULL, &udev->ddesc,
  		    USB_MAX_IPACKET, USB_MAX_IPACKET, 0, UDESC_DEVICE, 0, 0);
  		if (err != 0)
  {
  			break;
  }
  
  		
  		err = usbd_req_get_device_desc(udev, mtx, &udev->ddesc);
  		break;
  
  	default:
  		DPRINTF("Minimum bMaxPacketSize is large enough "
  		    "to hold the complete device descriptor or "
  		    "only one bMaxPacketSize choice\n");
  
  		
  		err = usbd_req_get_device_desc(udev, mtx, &udev->ddesc);
  
  		
  		if (err != 0)
  {
  			err = usbd_req_get_device_desc(udev, mtx, &udev->ddesc);
  }
  		break;
  	}
  
  	if (err != 0) {
  		DPRINTFN(0, "getting device descriptor "
  		    "at addr %d failed, %s\n", udev->address,
  		    usbd_errstr(err));
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_setup_device_desc, return);
  		return (err);
  	}
  
  	DPRINTF("adding unit addr=%d, rev=%02x, class=%d, "
  	    "subclass=%d, protocol=%d, maxpacket=%d, len=%d, speed=%d\n",
  	    udev->address, UGETW(udev->ddesc.bcdUSB),
  	    udev->ddesc.bDeviceClass,
  	    udev->ddesc.bDeviceSubClass,
  	    udev->ddesc.bDeviceProtocol,
  	    udev->ddesc.bMaxPacketSize,
  	    udev->ddesc.bLength,
  	    udev->speed);
  
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_setup_device_desc, return);
  	return (err);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_re_enumerate
   *
   * NOTE: After this function returns the hardware is in the
   * unconfigured state! The application is responsible for setting a
   * new configuration.
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_re_enumerate(struct usb_device *udev, struct mtx *mtx)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_re_enumerate, entry);
  	struct usb_device *parent_hub;
  	usb_error_t err;
  	uint8_t old_addr;
  	uint8_t do_retry = 1;
  
  	if (udev->flags.usb_mode != USB_MODE_HOST) {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_re_enumerate, return);
  		return (USB_ERR_INVAL);
  	}
  	old_addr = udev->address;
  	parent_hub = udev->parent_hub;
  	if (parent_hub == NULL) {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_re_enumerate, return);
  		return (USB_ERR_INVAL);
  	}
  retry:
  #if USB_HAVE_TT_SUPPORT
  	/*
  	 * Try to reset the High Speed parent HUB of a LOW- or FULL-
  	 * speed device, if any.
  	 */
  	if (udev->parent_hs_hub != NULL &&
  	    udev->speed != USB_SPEED_HIGH) {
  		DPRINTF("Trying to reset parent High Speed TT.\n");
  		if (udev->parent_hs_hub == parent_hub &&
  		    (uhub_count_active_host_ports(parent_hub, USB_SPEED_LOW) +
  		     uhub_count_active_host_ports(parent_hub, USB_SPEED_FULL)) == 1) {
  			
  			err = usbd_req_reset_tt(parent_hub, NULL,
  			    udev->hs_port_no);
  		} else {
  			
  			err = usbd_req_clear_tt_buffer(udev->parent_hs_hub, NULL,
  			    udev->hs_port_no, old_addr, UE_CONTROL, 0);
  		}
  		if (err) {
  			DPRINTF("Resetting parent High "
  			    "Speed TT failed (%s).\n",
  			    usbd_errstr(err));
  		}
  	}
  #endif
  	
  	if (parent_hub->speed == USB_SPEED_SUPER)
  {
  		usbd_req_warm_reset_port(parent_hub, mtx, udev->port_no);
  }
  
  	
  	err = usbd_req_reset_port(parent_hub, mtx, udev->port_no);
  	if (err) {
  		DPRINTFN(0, "addr=%d, port reset failed, %s\n", 
  		    old_addr, usbd_errstr(err));
  		goto done;
  	}
  
  	/*
  	 * After that the port has been reset our device should be at
  	 * address zero:
  	 */
  	udev->address = USB_START_ADDR;
  
  	
  	udev->ddesc.bMaxPacketSize = USB_MAX_IPACKET;
  
  	
  	usb_set_device_state(udev, USB_STATE_POWERED);
  
  	/*
  	 * Restore device address:
  	 */
  	err = usbd_req_set_address(udev, mtx, old_addr);
  	if (err) {
  		
  		DPRINTFN(0, "addr=%d, set address failed! (%s, ignored)\n",
  		    old_addr, usbd_errstr(err));
  	}
  	/*
  	 * Restore device address, if the controller driver did not
  	 * set a new one:
  	 */
  	if (udev->address == USB_START_ADDR)
  {
  		udev->address = old_addr;
  }
  
  	
  	err = usbd_setup_device_desc(udev, mtx);
  
  done:
  	if (err && do_retry) {
  		
  		usb_pause_mtx(mtx, hz / 2);
  		
  		do_retry = 0;
  		
  		goto retry;
  	}
  	
  	if (udev->address == USB_START_ADDR)
  {
  		udev->address = old_addr;
  }
  	
  	if (err == 0)
  {
  		usb_set_device_state(udev, USB_STATE_ADDRESSED);
  }
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_re_enumerate, return);
  	return (err);
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_clear_device_feature
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_clear_device_feature(struct usb_device *udev, struct mtx *mtx,
      uint16_t sel)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_clear_device_feature, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_DEVICE;
  	req.bRequest = UR_CLEAR_FEATURE;
  	USETW(req.wValue, sel);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_clear_device_feature, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_device_feature
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_device_feature(struct usb_device *udev, struct mtx *mtx,
      uint16_t sel)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_device_feature, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_DEVICE;
  	req.bRequest = UR_SET_FEATURE;
  	USETW(req.wValue, sel);
  	USETW(req.wIndex, 0);
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_device_feature, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_reset_tt
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_reset_tt(struct usb_device *udev, struct mtx *mtx,
      uint8_t port)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_reset_tt, entry);
  	struct usb_device_request req;
  
  	
  
  	if (udev->ddesc.bDeviceClass == UDCLASS_HUB &&
  	    udev->ddesc.bDeviceProtocol == UDPROTO_HSHUBSTT)
  {
  		port = 1;
  }
  
  	req.bmRequestType = UT_WRITE_CLASS_OTHER;
  	req.bRequest = UR_RESET_TT;
  	USETW(req.wValue, 0);
  	req.wIndex[0] = port;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_reset_tt, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_clear_tt_buffer
   *
   * For single TT HUBs the port should be 1.
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_clear_tt_buffer(struct usb_device *udev, struct mtx *mtx,
      uint8_t port, uint8_t addr, uint8_t type, uint8_t endpoint)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_clear_tt_buffer, entry);
  	struct usb_device_request req;
  	uint16_t wValue;
  
  	
  
  	if (udev->ddesc.bDeviceClass == UDCLASS_HUB &&
  	    udev->ddesc.bDeviceProtocol == UDPROTO_HSHUBSTT)
  {
  		port = 1;
  }
  
  	wValue = (endpoint & 0xF) | ((addr & 0x7F) << 4) |
  	    ((endpoint & 0x80) << 8) | ((type & 3) << 12);
  
  	req.bmRequestType = UT_WRITE_CLASS_OTHER;
  	req.bRequest = UR_CLEAR_TT_BUFFER;
  	USETW(req.wValue, wValue);
  	req.wIndex[0] = port;
  	req.wIndex[1] = 0;
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_clear_tt_buffer, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *	usbd_req_set_port_link_state
   *
   * USB 3.0 specific request
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_port_link_state(struct usb_device *udev, struct mtx *mtx,
      uint8_t port, uint8_t link_state)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_port_link_state, entry);
  	struct usb_device_request req;
  
  	req.bmRequestType = UT_WRITE_CLASS_OTHER;
  	req.bRequest = UR_SET_FEATURE;
  	USETW(req.wValue, UHF_PORT_LINK_STATE);
  	req.wIndex[0] = port;
  	req.wIndex[1] = link_state;
  	USETW(req.wLength, 0);
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_port_link_state, return);
  	return (usbd_do_request(udev, mtx, &req, 0));
  }
  
  /*------------------------------------------------------------------------*
   *		usbd_req_set_lpm_info
   *
   * USB 2.0 specific request for Link Power Management.
   *
   * Returns:
   * 0:				Success
   * USB_ERR_PENDING_REQUESTS:	NYET
   * USB_ERR_TIMEOUT:		TIMEOUT
   * USB_ERR_STALL:		STALL
   * Else:			Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_req_set_lpm_info(struct usb_device *udev, struct mtx *mtx,
      uint8_t port, uint8_t besl, uint8_t addr, uint8_t rwe)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_lpm_info, entry);
  	struct usb_device_request req;
  	usb_error_t err;
  	uint8_t buf[1];
  
  	req.bmRequestType = UT_WRITE_CLASS_OTHER;
  	req.bRequest = UR_SET_AND_TEST;
  	USETW(req.wValue, UHF_PORT_L1);
  	req.wIndex[0] = (port & 0xF) | ((besl & 0xF) << 4);
  	req.wIndex[1] = (addr & 0x7F) | (rwe ? 0x80 : 0x00);
  	USETW(req.wLength, sizeof(buf));
  
  	
  	buf[0] = 0x00;
  
  	err = usbd_do_request(udev, mtx, &req, buf);
  	if (err)
  {
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_lpm_info, return);
  		return (err);
  }
  
  	switch (buf[0]) {
  	case 0x00:	
  		break;
  	case 0x10:	
  		err = USB_ERR_PENDING_REQUESTS;
  		break;
  	case 0x11:	
  		err = USB_ERR_TIMEOUT;
  		break;
  	case 0x30:	
  		err = USB_ERR_STALLED;
  		break;
  	default:	
  		err = USB_ERR_IOERROR;
  		break;
  	}
  	SDT_PROBE0(tpw, kernel, usb_request_usbd_req_set_lpm_info, return);
  	return (err);
  }
  
  