FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/usb_device.c

     /* $FreeBSD: releng/11.2/sys/dev/usb/usb_device.c 332598 2018-04-16 16:19:31Z trasz $ */
     /*-
      * 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 <sys/conf.h>
    #include <sys/fcntl.h>
    
    #include <dev/usb/usb.h>
    #include <dev/usb/usbdi.h>
    #include <dev/usb/usbdi_util.h>
    #include <dev/usb/usb_ioctl.h>
    
    #if USB_HAVE_UGEN
    #include <sys/sbuf.h>
    #endif
    
    #include "usbdevs.h"
    
    #define USB_DEBUG_VAR usb_debug
    
    #include <dev/usb/usb_core.h>
    #include <dev/usb/usb_debug.h>
    #include <dev/usb/usb_process.h>
    #include <dev/usb/usb_device.h>
    #include <dev/usb/usb_busdma.h>
    #include <dev/usb/usb_transfer.h>
    #include <dev/usb/usb_request.h>
    #include <dev/usb/usb_dynamic.h>
    #include <dev/usb/usb_hub.h>
    #include <dev/usb/usb_util.h>
    #include <dev/usb/usb_msctest.h>
    #if USB_HAVE_UGEN
    #include <dev/usb/usb_dev.h>
    #include <dev/usb/usb_generic.h>
    #endif
    
    #include <dev/usb/quirk/usb_quirk.h>
    
    #include <dev/usb/usb_controller.h>
    #include <dev/usb/usb_bus.h>
    #endif                  /* USB_GLOBAL_INCLUDE_FILE */
    
    /* function prototypes  */
    
    static int      sysctl_hw_usb_template(SYSCTL_HANDLER_ARGS);
    static void     usb_init_endpoint(struct usb_device *, uint8_t,
                        struct usb_endpoint_descriptor *,
                        struct usb_endpoint_ss_comp_descriptor *,
                        struct usb_endpoint *);
    static void     usb_unconfigure(struct usb_device *, uint8_t);
    static void     usb_detach_device_sub(struct usb_device *, device_t *,
                        char **, uint8_t);
    static uint8_t  usb_probe_and_attach_sub(struct usb_device *,
                        struct usb_attach_arg *);
    static void     usb_init_attach_arg(struct usb_device *,
                        struct usb_attach_arg *);
   static void     usb_suspend_resume_sub(struct usb_device *, device_t,
                       uint8_t);
   static usb_proc_callback_t usbd_clear_stall_proc;
   static usb_error_t usb_config_parse(struct usb_device *, uint8_t, uint8_t);
   static void     usbd_set_device_strings(struct usb_device *);
   #if USB_HAVE_DEVCTL
   static void     usb_notify_addq(const char *type, struct usb_device *);
   #endif
   #if USB_HAVE_UGEN
   static void     usb_fifo_free_wrap(struct usb_device *, uint8_t, uint8_t);
   static void     usb_cdev_create(struct usb_device *);
   static void     usb_cdev_free(struct usb_device *);
   #endif
   
   /* This variable is global to allow easy access to it: */
   
   #ifdef  USB_TEMPLATE
   int     usb_template = USB_TEMPLATE;
   #else
   int     usb_template;
   #endif
   
   SYSCTL_PROC(_hw_usb, OID_AUTO, template,
       CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_MPSAFE,
       NULL, 0, sysctl_hw_usb_template,
       "I", "Selected USB device side template");
   
   /*------------------------------------------------------------------------*
    *      usb_trigger_reprobe_on_off
    *
    * This function sets the pull up resistors for all ports currently
    * operating in device mode either on (when on_not_off is 1), or off
    * (when it's 0).
    *------------------------------------------------------------------------*/
   static void
   usb_trigger_reprobe_on_off(int on_not_off)
   {
           struct usb_port_status ps;
           struct usb_bus *bus;
           struct usb_device *udev;
           usb_error_t err;
           int do_unlock, max;
   
           max = devclass_get_maxunit(usb_devclass_ptr);
           while (max >= 0) {
                   mtx_lock(&usb_ref_lock);
                   bus = devclass_get_softc(usb_devclass_ptr, max);
                   max--;
   
                   if (bus == NULL || bus->devices == NULL ||
                       bus->devices[USB_ROOT_HUB_ADDR] == NULL) {
                           mtx_unlock(&usb_ref_lock);
                           continue;
                   }
   
                   udev = bus->devices[USB_ROOT_HUB_ADDR];
   
                   if (udev->refcount == USB_DEV_REF_MAX) {
                           mtx_unlock(&usb_ref_lock);
                           continue;
                   }
   
                   udev->refcount++;
                   mtx_unlock(&usb_ref_lock);
   
                   do_unlock = usbd_enum_lock(udev);
                   if (do_unlock > 1) {
                           do_unlock = 0;
                           goto next;
                   }
   
                   err = usbd_req_get_port_status(udev, NULL, &ps, 1);
                   if (err != 0) {
                           DPRINTF("usbd_req_get_port_status() "
                               "failed: %s\n", usbd_errstr(err));
                           goto next;
                   }
   
                   if ((UGETW(ps.wPortStatus) & UPS_PORT_MODE_DEVICE) == 0)
                           goto next;
   
                   if (on_not_off) {
                           err = usbd_req_set_port_feature(udev, NULL, 1,
                               UHF_PORT_POWER);
                           if (err != 0) {
                                   DPRINTF("usbd_req_set_port_feature() "
                                       "failed: %s\n", usbd_errstr(err));
                           }
                   } else {
                           err = usbd_req_clear_port_feature(udev, NULL, 1,
                               UHF_PORT_POWER);
                           if (err != 0) {
                                   DPRINTF("usbd_req_clear_port_feature() "
                                       "failed: %s\n", usbd_errstr(err));
                           }
                   }
   
   next:
                   mtx_lock(&usb_ref_lock);
                   if (do_unlock)
                           usbd_enum_unlock(udev);
                   if (--(udev->refcount) == 0)
                           cv_broadcast(&udev->ref_cv);
                   mtx_unlock(&usb_ref_lock);
           }
   }
   
   /*------------------------------------------------------------------------*
    *      usb_trigger_reprobe_all
    *
    * This function toggles the pull up resistors for all ports currently
    * operating in device mode, causing the host machine to reenumerate them.
    *------------------------------------------------------------------------*/
   static void
   usb_trigger_reprobe_all(void)
   {
   
           /*
            * Set the pull up resistors off for all ports in device mode.
            */
           usb_trigger_reprobe_on_off(0);
   
           /*
            * According to the DWC OTG spec this must be at least 3ms.
            */
           usb_pause_mtx(NULL, USB_MS_TO_TICKS(USB_POWER_DOWN_TIME));
   
           /*
            * Set the pull up resistors back on.
            */
           usb_trigger_reprobe_on_off(1);
   }
   
   static int
   sysctl_hw_usb_template(SYSCTL_HANDLER_ARGS)
   {
           int error, val;
   
           val = usb_template;
           error = sysctl_handle_int(oidp, &val, 0, req);
           if (error != 0 || req->newptr == NULL || usb_template == val)
                   return (error);
   
           usb_template = val;
   
           if (usb_template < 0) {
                   usb_trigger_reprobe_on_off(0);
           } else {
                   usb_trigger_reprobe_all();
           }
   
           return (0);
   }
   
   /* English is default language */
   
   static int usb_lang_id = 0x0009;
   static int usb_lang_mask = 0x00FF;
   
   SYSCTL_INT(_hw_usb, OID_AUTO, usb_lang_id, CTLFLAG_RWTUN,
       &usb_lang_id, 0, "Preferred USB language ID");
   
   SYSCTL_INT(_hw_usb, OID_AUTO, usb_lang_mask, CTLFLAG_RWTUN,
       &usb_lang_mask, 0, "Preferred USB language mask");
   
   static const char* statestr[USB_STATE_MAX] = {
           [USB_STATE_DETACHED]    = "DETACHED",
           [USB_STATE_ATTACHED]    = "ATTACHED",
           [USB_STATE_POWERED]     = "POWERED",
           [USB_STATE_ADDRESSED]   = "ADDRESSED",
           [USB_STATE_CONFIGURED]  = "CONFIGURED",
   };
   
   const char *
   usb_statestr(enum usb_dev_state state)
   {
           return ((state < USB_STATE_MAX) ? statestr[state] : "UNKNOWN");
   }
   
   const char *
   usb_get_manufacturer(struct usb_device *udev)
   {
           return (udev->manufacturer ? udev->manufacturer : "Unknown");
   }
   
   const char *
   usb_get_product(struct usb_device *udev)
   {
           return (udev->product ? udev->product : "");
   }
   
   const char *
   usb_get_serial(struct usb_device *udev)
   {
           return (udev->serial ? udev->serial : "");
   }
   
   /*------------------------------------------------------------------------*
    *      usbd_get_ep_by_addr
    *
    * This function searches for an USB ep by endpoint address and
    * direction.
    *
    * Returns:
    * NULL: Failure
    * Else: Success
    *------------------------------------------------------------------------*/
   struct usb_endpoint *
   usbd_get_ep_by_addr(struct usb_device *udev, uint8_t ea_val)
   {
           struct usb_endpoint *ep = udev->endpoints;
           struct usb_endpoint *ep_end = udev->endpoints + udev->endpoints_max;
           enum {
                   EA_MASK = (UE_DIR_IN | UE_DIR_OUT | UE_ADDR),
           };
   
           /*
            * According to the USB specification not all bits are used
            * for the endpoint address. Keep defined bits only:
            */
           ea_val &= EA_MASK;
   
           /*
            * Iterate across all the USB endpoints searching for a match
            * based on the endpoint address:
            */
           for (; ep != ep_end; ep++) {
   
                   if (ep->edesc == NULL) {
                           continue;
                   }
                   /* do the mask and check the value */
                   if ((ep->edesc->bEndpointAddress & EA_MASK) == ea_val) {
                           goto found;
                   }
           }
   
           /*
            * The default endpoint is always present and is checked separately:
            */
           if ((udev->ctrl_ep.edesc != NULL) &&
               ((udev->ctrl_ep.edesc->bEndpointAddress & EA_MASK) == ea_val)) {
                   ep = &udev->ctrl_ep;
                   goto found;
           }
           return (NULL);
   
   found:
           return (ep);
   }
   
   /*------------------------------------------------------------------------*
    *      usbd_get_endpoint
    *
    * This function searches for an USB endpoint based on the information
    * given by the passed "struct usb_config" pointer.
    *
    * Return values:
    * NULL: No match.
    * Else: Pointer to "struct usb_endpoint".
    *------------------------------------------------------------------------*/
   struct usb_endpoint *
   usbd_get_endpoint(struct usb_device *udev, uint8_t iface_index,
       const struct usb_config *setup)
   {
           struct usb_endpoint *ep = udev->endpoints;
           struct usb_endpoint *ep_end = udev->endpoints + udev->endpoints_max;
           uint8_t index = setup->ep_index;
           uint8_t ea_mask;
           uint8_t ea_val;
           uint8_t type_mask;
           uint8_t type_val;
   
           DPRINTFN(10, "udev=%p iface_index=%d address=0x%x "
               "type=0x%x dir=0x%x index=%d\n",
               udev, iface_index, setup->endpoint,
               setup->type, setup->direction, setup->ep_index);
   
           /* check USB mode */
   
           if (setup->usb_mode != USB_MODE_DUAL &&
               udev->flags.usb_mode != setup->usb_mode) {
                   /* wrong mode - no endpoint */
                   return (NULL);
           }
   
           /* setup expected endpoint direction mask and value */
   
           if (setup->direction == UE_DIR_RX) {
                   ea_mask = (UE_DIR_IN | UE_DIR_OUT);
                   ea_val = (udev->flags.usb_mode == USB_MODE_DEVICE) ?
                       UE_DIR_OUT : UE_DIR_IN;
           } else if (setup->direction == UE_DIR_TX) {
                   ea_mask = (UE_DIR_IN | UE_DIR_OUT);
                   ea_val = (udev->flags.usb_mode == USB_MODE_DEVICE) ?
                       UE_DIR_IN : UE_DIR_OUT;
           } else if (setup->direction == UE_DIR_ANY) {
                   /* match any endpoint direction */
                   ea_mask = 0;
                   ea_val = 0;
           } else {
                   /* match the given endpoint direction */
                   ea_mask = (UE_DIR_IN | UE_DIR_OUT);
                   ea_val = (setup->direction & (UE_DIR_IN | UE_DIR_OUT));
           }
   
           /* setup expected endpoint address */
   
           if (setup->endpoint == UE_ADDR_ANY) {
                   /* match any endpoint address */
           } else {
                   /* match the given endpoint address */
                   ea_mask |= UE_ADDR;
                   ea_val |= (setup->endpoint & UE_ADDR);
           }
   
           /* setup expected endpoint type */
   
           if (setup->type == UE_BULK_INTR) {
                   /* this will match BULK and INTERRUPT endpoints */
                   type_mask = 2;
                   type_val = 2;
           } else if (setup->type == UE_TYPE_ANY) {
                   /* match any endpoint type */
                   type_mask = 0;
                   type_val = 0;
           } else {
                   /* match the given endpoint type */
                   type_mask = UE_XFERTYPE;
                   type_val = (setup->type & UE_XFERTYPE);
           }
   
           /*
            * Iterate across all the USB endpoints searching for a match
            * based on the endpoint address. Note that we are searching
            * the endpoints from the beginning of the "udev->endpoints" array.
            */
           for (; ep != ep_end; ep++) {
   
                   if ((ep->edesc == NULL) ||
                       (ep->iface_index != iface_index)) {
                           continue;
                   }
                   /* do the masks and check the values */
   
                   if (((ep->edesc->bEndpointAddress & ea_mask) == ea_val) &&
                       ((ep->edesc->bmAttributes & type_mask) == type_val)) {
                           if (!index--) {
                                   goto found;
                           }
                   }
           }
   
           /*
            * Match against default endpoint last, so that "any endpoint", "any
            * address" and "any direction" returns the first endpoint of the
            * interface. "iface_index" and "direction" is ignored:
            */
           if ((udev->ctrl_ep.edesc != NULL) &&
               ((udev->ctrl_ep.edesc->bEndpointAddress & ea_mask) == ea_val) &&
               ((udev->ctrl_ep.edesc->bmAttributes & type_mask) == type_val) &&
               (!index)) {
                   ep = &udev->ctrl_ep;
                   goto found;
           }
           return (NULL);
   
   found:
           return (ep);
   }
   
   /*------------------------------------------------------------------------*
    *      usbd_interface_count
    *
    * This function stores the number of USB interfaces excluding
    * alternate settings, which the USB config descriptor reports into
    * the unsigned 8-bit integer pointed to by "count".
    *
    * Returns:
    *    0: Success
    * Else: Failure
    *------------------------------------------------------------------------*/
   usb_error_t
   usbd_interface_count(struct usb_device *udev, uint8_t *count)
   {
           if (udev->cdesc == NULL) {
                   *count = 0;
                   return (USB_ERR_NOT_CONFIGURED);
           }
           *count = udev->ifaces_max;
           return (USB_ERR_NORMAL_COMPLETION);
   }
   
   /*------------------------------------------------------------------------*
    *      usb_init_endpoint
    *
    * This function will initialise the USB endpoint structure pointed to by
    * the "endpoint" argument. The structure pointed to by "endpoint" must be
    * zeroed before calling this function.
    *------------------------------------------------------------------------*/
   static void
   usb_init_endpoint(struct usb_device *udev, uint8_t iface_index,
       struct usb_endpoint_descriptor *edesc,
       struct usb_endpoint_ss_comp_descriptor *ecomp,
       struct usb_endpoint *ep)
   {
           const struct usb_bus_methods *methods;
           usb_stream_t x;
   
           methods = udev->bus->methods;
   
           (methods->endpoint_init) (udev, edesc, ep);
   
           /* initialise USB endpoint structure */
           ep->edesc = edesc;
           ep->ecomp = ecomp;
           ep->iface_index = iface_index;
   
           /* setup USB stream queues */
           for (x = 0; x != USB_MAX_EP_STREAMS; x++) {
                   TAILQ_INIT(&ep->endpoint_q[x].head);
                   ep->endpoint_q[x].command = &usbd_pipe_start;
           }
   
           /* the pipe is not supported by the hardware */
           if (ep->methods == NULL)
                   return;
   
           /* check for SUPER-speed streams mode endpoint */
           if (udev->speed == USB_SPEED_SUPER && ecomp != NULL &&
               (edesc->bmAttributes & UE_XFERTYPE) == UE_BULK &&
               (UE_GET_BULK_STREAMS(ecomp->bmAttributes) != 0)) {
                   usbd_set_endpoint_mode(udev, ep, USB_EP_MODE_STREAMS);
           } else {
                   usbd_set_endpoint_mode(udev, ep, USB_EP_MODE_DEFAULT);
           }
   
           /* clear stall, if any */
           if (methods->clear_stall != NULL) {
                   USB_BUS_LOCK(udev->bus);
                   (methods->clear_stall) (udev, ep);
                   USB_BUS_UNLOCK(udev->bus);
           }
   }
   
   /*-----------------------------------------------------------------------*
    *      usb_endpoint_foreach
    *
    * This function will iterate all the USB endpoints except the control
    * endpoint. This function is NULL safe.
    *
    * Return values:
    * NULL: End of USB endpoints
    * Else: Pointer to next USB endpoint
    *------------------------------------------------------------------------*/
   struct usb_endpoint *
   usb_endpoint_foreach(struct usb_device *udev, struct usb_endpoint *ep)
   {
           struct usb_endpoint *ep_end;
   
           /* be NULL safe */
           if (udev == NULL)
                   return (NULL);
   
           ep_end = udev->endpoints + udev->endpoints_max;
   
           /* get next endpoint */
           if (ep == NULL)
                   ep = udev->endpoints;
           else
                   ep++;
   
           /* find next allocated ep */
           while (ep != ep_end) {
                   if (ep->edesc != NULL)
                           return (ep);
                   ep++;
           }
           return (NULL);
   }
   
   /*------------------------------------------------------------------------*
    *      usb_wait_pending_refs
    *
    * This function will wait for any USB references to go away before
    * returning. This function is used before freeing a USB device.
    *------------------------------------------------------------------------*/
   static void
   usb_wait_pending_refs(struct usb_device *udev)
   {
   #if USB_HAVE_UGEN
           DPRINTF("Refcount = %d\n", (int)udev->refcount); 
   
           mtx_lock(&usb_ref_lock);
           udev->refcount--;
           while (1) {
                   /* wait for any pending references to go away */
                   if (udev->refcount == 0) {
                           /* prevent further refs being taken, if any */
                           udev->refcount = USB_DEV_REF_MAX;
                           break;
                   }
                   cv_wait(&udev->ref_cv, &usb_ref_lock);
           }
           mtx_unlock(&usb_ref_lock);
   #endif
   }
   
   /*------------------------------------------------------------------------*
    *      usb_unconfigure
    *
    * This function will free all USB interfaces and USB endpoints belonging
    * to an USB device.
    *
    * Flag values, see "USB_UNCFG_FLAG_XXX".
    *------------------------------------------------------------------------*/
   static void
   usb_unconfigure(struct usb_device *udev, uint8_t flag)
   {
           uint8_t do_unlock;
   
           /* Prevent re-enumeration */
           do_unlock = usbd_enum_lock(udev);
   
           /* detach all interface drivers */
           usb_detach_device(udev, USB_IFACE_INDEX_ANY, flag);
   
   #if USB_HAVE_UGEN
           /* free all FIFOs except control endpoint FIFOs */
           usb_fifo_free_wrap(udev, USB_IFACE_INDEX_ANY, flag);
   
           /*
            * Free all cdev's, if any.
            */
           usb_cdev_free(udev);
   #endif
   
   #if USB_HAVE_COMPAT_LINUX
           /* free Linux compat device, if any */
           if (udev->linux_endpoint_start != NULL) {
                   usb_linux_free_device_p(udev);
                   udev->linux_endpoint_start = NULL;
           }
   #endif
   
           usb_config_parse(udev, USB_IFACE_INDEX_ANY, USB_CFG_FREE);
   
           /* free "cdesc" after "ifaces" and "endpoints", if any */
           if (udev->cdesc != NULL) {
                   if (udev->flags.usb_mode != USB_MODE_DEVICE)
                           usbd_free_config_desc(udev, udev->cdesc);
                   udev->cdesc = NULL;
           }
           /* set unconfigured state */
           udev->curr_config_no = USB_UNCONFIG_NO;
           udev->curr_config_index = USB_UNCONFIG_INDEX;
   
           if (do_unlock)
                   usbd_enum_unlock(udev);
   }
   
   /*------------------------------------------------------------------------*
    *      usbd_set_config_index
    *
    * This function selects configuration by index, independent of the
    * actual configuration number. This function should not be used by
    * USB drivers.
    *
    * Returns:
    *    0: Success
    * Else: Failure
    *------------------------------------------------------------------------*/
   usb_error_t
   usbd_set_config_index(struct usb_device *udev, uint8_t index)
   {
           struct usb_status ds;
           struct usb_config_descriptor *cdp;
           uint16_t power;
           uint16_t max_power;
           uint8_t selfpowered;
           uint8_t do_unlock;
           usb_error_t err;
   
           DPRINTFN(6, "udev=%p index=%d\n", udev, index);
   
           /* Prevent re-enumeration */
           do_unlock = usbd_enum_lock(udev);
   
           usb_unconfigure(udev, 0);
   
           if (index == USB_UNCONFIG_INDEX) {
                   /*
                    * Leave unallocated when unconfiguring the
                    * device. "usb_unconfigure()" will also reset
                    * the current config number and index.
                    */
                   err = usbd_req_set_config(udev, NULL, USB_UNCONFIG_NO);
                   if (udev->state == USB_STATE_CONFIGURED)
                           usb_set_device_state(udev, USB_STATE_ADDRESSED);
                   goto done;
           }
           /* get the full config descriptor */
           if (udev->flags.usb_mode == USB_MODE_DEVICE) {
                   /* save some memory */
                   err = usbd_req_get_descriptor_ptr(udev, &cdp, 
                       (UDESC_CONFIG << 8) | index);
           } else {
                   /* normal request */
                   err = usbd_req_get_config_desc_full(udev,
                       NULL, &cdp, index);
           }
           if (err) {
                   goto done;
           }
           /* set the new config descriptor */
   
           udev->cdesc = cdp;
   
           /* Figure out if the device is self or bus powered. */
           selfpowered = 0;
           if ((!udev->flags.uq_bus_powered) &&
               (cdp->bmAttributes & UC_SELF_POWERED) &&
               (udev->flags.usb_mode == USB_MODE_HOST)) {
                   /* May be self powered. */
                   if (cdp->bmAttributes & UC_BUS_POWERED) {
                           /* Must ask device. */
                           err = usbd_req_get_device_status(udev, NULL, &ds);
                           if (err) {
                                   DPRINTFN(0, "could not read "
                                       "device status: %s\n",
                                       usbd_errstr(err));
                           } else if (UGETW(ds.wStatus) & UDS_SELF_POWERED) {
                                   selfpowered = 1;
                           }
                           DPRINTF("status=0x%04x \n",
                                   UGETW(ds.wStatus));
                   } else
                           selfpowered = 1;
           }
           DPRINTF("udev=%p cdesc=%p (addr %d) cno=%d attr=0x%02x, "
               "selfpowered=%d, power=%d\n",
               udev, cdp,
               udev->address, cdp->bConfigurationValue, cdp->bmAttributes,
               selfpowered, cdp->bMaxPower * 2);
   
           /* Check if we have enough power. */
           power = cdp->bMaxPower * 2;
   
           if (udev->parent_hub) {
                   max_power = udev->parent_hub->hub->portpower;
           } else {
                   max_power = USB_MAX_POWER;
           }
   
           if (power > max_power) {
                   DPRINTFN(0, "power exceeded %d > %d\n", power, max_power);
                   err = USB_ERR_NO_POWER;
                   goto done;
           }
           /* Only update "self_powered" in USB Host Mode */
           if (udev->flags.usb_mode == USB_MODE_HOST) {
                   udev->flags.self_powered = selfpowered;
           }
           udev->power = power;
           udev->curr_config_no = cdp->bConfigurationValue;
           udev->curr_config_index = index;
           usb_set_device_state(udev, USB_STATE_CONFIGURED);
   
           /* Set the actual configuration value. */
           err = usbd_req_set_config(udev, NULL, cdp->bConfigurationValue);
           if (err) {
                   goto done;
           }
   
           err = usb_config_parse(udev, USB_IFACE_INDEX_ANY, USB_CFG_ALLOC);
           if (err) {
                   goto done;
           }
   
           err = usb_config_parse(udev, USB_IFACE_INDEX_ANY, USB_CFG_INIT);
           if (err) {
                   goto done;
           }
   
   #if USB_HAVE_UGEN
           /* create device nodes for each endpoint */
           usb_cdev_create(udev);
   #endif
   
   done:
           DPRINTF("error=%s\n", usbd_errstr(err));
           if (err) {
                   usb_unconfigure(udev, 0);
           }
           if (do_unlock)
                   usbd_enum_unlock(udev);
           return (err);
   }
   
   /*------------------------------------------------------------------------*
    *      usb_config_parse
    *
    * This function will allocate and free USB interfaces and USB endpoints,
    * parse the USB configuration structure and initialise the USB endpoints
    * and interfaces. If "iface_index" is not equal to
    * "USB_IFACE_INDEX_ANY" then the "cmd" parameter is the
    * alternate_setting to be selected for the given interface. Else the
    * "cmd" parameter is defined by "USB_CFG_XXX". "iface_index" can be
    * "USB_IFACE_INDEX_ANY" or a valid USB interface index. This function
    * is typically called when setting the configuration or when setting
    * an alternate interface.
    *
    * Returns:
    *    0: Success
    * Else: Failure
    *------------------------------------------------------------------------*/
   static usb_error_t
   usb_config_parse(struct usb_device *udev, uint8_t iface_index, uint8_t cmd)
   {
           struct usb_idesc_parse_state ips;
           struct usb_interface_descriptor *id;
           struct usb_endpoint_descriptor *ed;
           struct usb_interface *iface;
           struct usb_endpoint *ep;
           usb_error_t err;
           uint8_t ep_curr;
           uint8_t ep_max;
           uint8_t temp;
           uint8_t do_init;
           uint8_t alt_index;
   
           if (iface_index != USB_IFACE_INDEX_ANY) {
                   /* parameter overload */
                   alt_index = cmd;
                   cmd = USB_CFG_INIT;
           } else {
                   /* not used */
                   alt_index = 0;
           }
   
           err = 0;
   
           DPRINTFN(5, "iface_index=%d cmd=%d\n",
               iface_index, cmd);
   
           if (cmd == USB_CFG_FREE)
                   goto cleanup;
   
           if (cmd == USB_CFG_INIT) {
                   sx_assert(&udev->enum_sx, SA_LOCKED);
   
                   /* check for in-use endpoints */
   
                   ep = udev->endpoints;
                   ep_max = udev->endpoints_max;
                   while (ep_max--) {
                           /* look for matching endpoints */
                           if ((iface_index == USB_IFACE_INDEX_ANY) ||
                               (iface_index == ep->iface_index)) {
                                   if (ep->refcount_alloc != 0) {
                                           /*
                                            * This typically indicates a
                                            * more serious error.
                                            */
                                           err = USB_ERR_IN_USE;
                                   } else {
                                           /* reset endpoint */
                                           memset(ep, 0, sizeof(*ep));
                                           /* make sure we don't zero the endpoint again */
                                           ep->iface_index = USB_IFACE_INDEX_ANY;
                                   }
                           }
                           ep++;
                   }
   
                   if (err)
                           return (err);
           }
   
           memset(&ips, 0, sizeof(ips));
   
           ep_curr = 0;
           ep_max = 0;
   
           while ((id = usb_idesc_foreach(udev->cdesc, &ips))) {
   
                   iface = udev->ifaces + ips.iface_index;
   
                   /* check for specific interface match */
   
                   if (cmd == USB_CFG_INIT) {
                           if ((iface_index != USB_IFACE_INDEX_ANY) && 
                               (iface_index != ips.iface_index)) {
                                   /* wrong interface */
                                   do_init = 0;
                           } else if (alt_index != ips.iface_index_alt) {
                                   /* wrong alternate setting */
                                   do_init = 0;
                           } else {
                                   /* initialise interface */
                                   do_init = 1;
                           }
                   } else
                           do_init = 0;
   
                   /* check for new interface */
                   if (ips.iface_index_alt == 0) {
                           /* update current number of endpoints */
                           ep_curr = ep_max;
                   }
                   /* check for init */
                   if (do_init) {
                           /* setup the USB interface structure */
                           iface->idesc = id;
                           /* set alternate index */
                           iface->alt_index = alt_index;
                           /* set default interface parent */
                           if (iface_index == USB_IFACE_INDEX_ANY) {
                                   iface->parent_iface_index =
                                       USB_IFACE_INDEX_ANY;
                           }
                   }
   
                   DPRINTFN(5, "found idesc nendpt=%d\n", id->bNumEndpoints);
   
                   ed = (struct usb_endpoint_descriptor *)id;
   
                   temp = ep_curr;
   
                   /* iterate all the endpoint descriptors */
                   while ((ed = usb_edesc_foreach(udev->cdesc, ed))) {
   
                           /* check if endpoint limit has been reached */
                           if (temp >= USB_MAX_EP_UNITS) {
                                   DPRINTF("Endpoint limit reached\n");
                                   break;
                           }
   
                           ep = udev->endpoints + temp;
   
                           if (do_init) {
                                   void *ecomp;
   
                                   ecomp = usb_ed_comp_foreach(udev->cdesc, (void *)ed);
                                   if (ecomp != NULL)
                                           DPRINTFN(5, "Found endpoint companion descriptor\n");
   
                                   usb_init_endpoint(udev, 
                                       ips.iface_index, ed, ecomp, ep);
                           }
   
                           temp ++;
   
                           /* find maximum number of endpoints */
                           if (ep_max < temp)
                                   ep_max = temp;
                   }
           }
   
           /* NOTE: It is valid to have no interfaces and no endpoints! */
   
           if (cmd == USB_CFG_ALLOC) {
                   udev->ifaces_max = ips.iface_index;
   #if (USB_HAVE_FIXED_IFACE == 0)
                   udev->ifaces = NULL;
                   if (udev->ifaces_max != 0) {
                           udev->ifaces = malloc(sizeof(*iface) * udev->ifaces_max,
                                   M_USB, M_WAITOK | M_ZERO);
                           if (udev->ifaces == NULL) {
                                   err = USB_ERR_NOMEM;
                                   goto done;
                           }
                   }
   #endif
   #if (USB_HAVE_FIXED_ENDPOINT == 0)
                   if (ep_max != 0) {
                           udev->endpoints = malloc(sizeof(*ep) * ep_max,
                                   M_USB, M_WAITOK | M_ZERO);
                           if (udev->endpoints == NULL) {
                                   err = USB_ERR_NOMEM;
                                   goto done;
                           }
                   } else {
                           udev->endpoints = NULL;
                   }
   #endif
                   USB_BUS_LOCK(udev->bus);
                   udev->endpoints_max = ep_max;
                   /* reset any ongoing clear-stall */
                   udev->ep_curr = NULL;
                   USB_BUS_UNLOCK(udev->bus);
           }
   #if (USB_HAVE_FIXED_IFACE == 0) || (USB_HAVE_FIXED_ENDPOINT == 0) 
   done:
   #endif
           if (err) {
                   if (cmd == USB_CFG_ALLOC) {
   cleanup:
                           USB_BUS_LOCK(udev->bus);
                           udev->endpoints_max = 0;
                          /* reset any ongoing clear-stall */
                          udev->ep_curr = NULL;
                          USB_BUS_UNLOCK(udev->bus);
  
  #if (USB_HAVE_FIXED_IFACE == 0)
                          free(udev->ifaces, M_USB);
                          udev->ifaces = NULL;
  #endif
  #if (USB_HAVE_FIXED_ENDPOINT == 0)
                          free(udev->endpoints, M_USB);
                          udev->endpoints = NULL;
  #endif
                          udev->ifaces_max = 0;
                  }
          }
          return (err);
  }
  
  /*------------------------------------------------------------------------*
   *      usbd_set_alt_interface_index
   *
   * This function will select an alternate interface index for the
   * given interface index. The interface should not be in use when this
   * function is called. That means there should not be any open USB
   * transfers. Else an error is returned. If the alternate setting is
   * already set this function will simply return success. This function
   * is called in Host mode and Device mode!
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_set_alt_interface_index(struct usb_device *udev,
      uint8_t iface_index, uint8_t alt_index)
  {
          struct usb_interface *iface = usbd_get_iface(udev, iface_index);
          usb_error_t err;
          uint8_t do_unlock;
  
          /* Prevent re-enumeration */
          do_unlock = usbd_enum_lock(udev);
  
          if (iface == NULL) {
                  err = USB_ERR_INVAL;
                  goto done;
          }
          if (iface->alt_index == alt_index) {
                  /* 
                   * Optimise away duplicate setting of
                   * alternate setting in USB Host Mode!
                   */
                  err = 0;
                  goto done;
          }
  #if USB_HAVE_UGEN
          /*
           * Free all generic FIFOs for this interface, except control
           * endpoint FIFOs:
           */
          usb_fifo_free_wrap(udev, iface_index, 0);
  #endif
  
          err = usb_config_parse(udev, iface_index, alt_index);
          if (err) {
                  goto done;
          }
          if (iface->alt_index != alt_index) {
                  /* the alternate setting does not exist */
                  err = USB_ERR_INVAL;
                  goto done;
          }
  
          err = usbd_req_set_alt_interface_no(udev, NULL, iface_index,
              iface->idesc->bAlternateSetting);
  
  done:
          if (do_unlock)
                  usbd_enum_unlock(udev);
          return (err);
  }
  
  /*------------------------------------------------------------------------*
   *      usbd_set_endpoint_stall
   *
   * This function is used to make a BULK or INTERRUPT endpoint send
   * STALL tokens in USB device mode.
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usbd_set_endpoint_stall(struct usb_device *udev, struct usb_endpoint *ep,
      uint8_t do_stall)
  {
          struct usb_xfer *xfer;
          usb_stream_t x;
          uint8_t et;
          uint8_t was_stalled;
  
          if (ep == NULL) {
                  /* nothing to do */
                  DPRINTF("Cannot find endpoint\n");
                  /*
                   * Pretend that the clear or set stall request is
                   * successful else some USB host stacks can do
                   * strange things, especially when a control endpoint
                   * stalls.
                   */
                  return (0);
          }
          et = (ep->edesc->bmAttributes & UE_XFERTYPE);
  
          if ((et != UE_BULK) &&
              (et != UE_INTERRUPT)) {
                  /*
                   * Should not stall control
                   * nor isochronous endpoints.
                   */
                  DPRINTF("Invalid endpoint\n");
                  return (0);
          }
          USB_BUS_LOCK(udev->bus);
  
          /* store current stall state */
          was_stalled = ep->is_stalled;
  
          /* check for no change */
          if (was_stalled && do_stall) {
                  /* if the endpoint is already stalled do nothing */
                  USB_BUS_UNLOCK(udev->bus);
                  DPRINTF("No change\n");
                  return (0);
          }
          /* set stalled state */
          ep->is_stalled = 1;
  
          if (do_stall || (!was_stalled)) {
                  if (!was_stalled) {
                          for (x = 0; x != USB_MAX_EP_STREAMS; x++) {
                                  /* lookup the current USB transfer, if any */
                                  xfer = ep->endpoint_q[x].curr;
                                  if (xfer != NULL) {
                                          /*
                                           * The "xfer_stall" method
                                           * will complete the USB
                                           * transfer like in case of a
                                           * timeout setting the error
                                           * code "USB_ERR_STALLED".
                                           */
                                          (udev->bus->methods->xfer_stall) (xfer);
                                  }
                          }
                  }
                  (udev->bus->methods->set_stall) (udev, ep, &do_stall);
          }
          if (!do_stall) {
                  ep->toggle_next = 0;    /* reset data toggle */
                  ep->is_stalled = 0;     /* clear stalled state */
  
                  (udev->bus->methods->clear_stall) (udev, ep);
  
                  /* start the current or next transfer, if any */
                  for (x = 0; x != USB_MAX_EP_STREAMS; x++) {
                          usb_command_wrapper(&ep->endpoint_q[x],
                              ep->endpoint_q[x].curr);
                  }
          }
          USB_BUS_UNLOCK(udev->bus);
          return (0);
  }
  
  /*------------------------------------------------------------------------*
   *      usb_reset_iface_endpoints - used in USB device side mode
   *------------------------------------------------------------------------*/
  usb_error_t
  usb_reset_iface_endpoints(struct usb_device *udev, uint8_t iface_index)
  {
          struct usb_endpoint *ep;
          struct usb_endpoint *ep_end;
  
          ep = udev->endpoints;
          ep_end = udev->endpoints + udev->endpoints_max;
  
          for (; ep != ep_end; ep++) {
  
                  if ((ep->edesc == NULL) ||
                      (ep->iface_index != iface_index)) {
                          continue;
                  }
                  /* simulate a clear stall from the peer */
                  usbd_set_endpoint_stall(udev, ep, 0);
          }
          return (0);
  }
  
  /*------------------------------------------------------------------------*
   *      usb_detach_device_sub
   *
   * This function will try to detach an USB device. If it fails a panic
   * will result.
   *
   * Flag values, see "USB_UNCFG_FLAG_XXX".
   *------------------------------------------------------------------------*/
  static void
  usb_detach_device_sub(struct usb_device *udev, device_t *ppdev,
      char **ppnpinfo, uint8_t flag)
  {
          device_t dev;
          char *pnpinfo;
          int err;
  
          dev = *ppdev;
          if (dev) {
                  /*
                   * NOTE: It is important to clear "*ppdev" before deleting
                   * the child due to some device methods being called late
                   * during the delete process !
                   */
                  *ppdev = NULL;
  
                  if (!rebooting) {
                          device_printf(dev, "at %s, port %d, addr %d "
                              "(disconnected)\n",
                              device_get_nameunit(udev->parent_dev),
                              udev->port_no, udev->address);
                  }
  
                  if (device_is_attached(dev)) {
                          if (udev->flags.peer_suspended) {
                                  err = DEVICE_RESUME(dev);
                                  if (err) {
                                          device_printf(dev, "Resume failed\n");
                                  }
                          }
                  }
                  /* detach and delete child */
                  if (device_delete_child(udev->parent_dev, dev)) {
                          goto error;
                  }
          }
  
          pnpinfo = *ppnpinfo;
          if (pnpinfo != NULL) {
                  *ppnpinfo = NULL;
                  free(pnpinfo, M_USBDEV);
          }
          return;
  
  error:
          /* Detach is not allowed to fail in the USB world */
          panic("usb_detach_device_sub: A USB driver would not detach\n");
  }
  
  /*------------------------------------------------------------------------*
   *      usb_detach_device
   *
   * The following function will detach the matching interfaces.
   * This function is NULL safe.
   *
   * Flag values, see "USB_UNCFG_FLAG_XXX".
   *------------------------------------------------------------------------*/
  void
  usb_detach_device(struct usb_device *udev, uint8_t iface_index,
      uint8_t flag)
  {
          struct usb_interface *iface;
          uint8_t i;
  
          if (udev == NULL) {
                  /* nothing to do */
                  return;
          }
          DPRINTFN(4, "udev=%p\n", udev);
  
          sx_assert(&udev->enum_sx, SA_LOCKED);
  
          /*
           * First detach the child to give the child's detach routine a
           * chance to detach the sub-devices in the correct order.
           * Then delete the child using "device_delete_child()" which
           * will detach all sub-devices from the bottom and upwards!
           */
          if (iface_index != USB_IFACE_INDEX_ANY) {
                  i = iface_index;
                  iface_index = i + 1;
          } else {
                  i = 0;
                  iface_index = USB_IFACE_MAX;
          }
  
          /* do the detach */
  
          for (; i != iface_index; i++) {
  
                  iface = usbd_get_iface(udev, i);
                  if (iface == NULL) {
                          /* looks like the end of the USB interfaces */
                          break;
                  }
                  usb_detach_device_sub(udev, &iface->subdev,
                      &iface->pnpinfo, flag);
          }
  }
  
  /*------------------------------------------------------------------------*
   *      usb_probe_and_attach_sub
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  static uint8_t
  usb_probe_and_attach_sub(struct usb_device *udev,
      struct usb_attach_arg *uaa)
  {
          struct usb_interface *iface;
          device_t dev;
          int err;
  
          iface = uaa->iface;
          if (iface->parent_iface_index != USB_IFACE_INDEX_ANY) {
                  /* leave interface alone */
                  return (0);
          }
          dev = iface->subdev;
          if (dev) {
  
                  /* clean up after module unload */
  
                  if (device_is_attached(dev)) {
                          /* already a device there */
                          return (0);
                  }
                  /* clear "iface->subdev" as early as possible */
  
                  iface->subdev = NULL;
  
                  if (device_delete_child(udev->parent_dev, dev)) {
  
                          /*
                           * Panic here, else one can get a double call
                           * to device_detach().  USB devices should
                           * never fail on detach!
                           */
                          panic("device_delete_child() failed\n");
                  }
          }
          if (uaa->temp_dev == NULL) {
  
                  /* create a new child */
                  uaa->temp_dev = device_add_child(udev->parent_dev, NULL, -1);
                  if (uaa->temp_dev == NULL) {
                          device_printf(udev->parent_dev,
                              "Device creation failed\n");
                          return (1);     /* failure */
                  }
                  device_set_ivars(uaa->temp_dev, uaa);
                  device_quiet(uaa->temp_dev);
          }
          /*
           * Set "subdev" before probe and attach so that "devd" gets
           * the information it needs.
           */
          iface->subdev = uaa->temp_dev;
  
          if (device_probe_and_attach(iface->subdev) == 0) {
                  /*
                   * The USB attach arguments are only available during probe
                   * and attach !
                   */
                  uaa->temp_dev = NULL;
                  device_set_ivars(iface->subdev, NULL);
  
                  if (udev->flags.peer_suspended) {
                          err = DEVICE_SUSPEND(iface->subdev);
                          if (err)
                                  device_printf(iface->subdev, "Suspend failed\n");
                  }
                  return (0);             /* success */
          } else {
                  /* No USB driver found */
                  iface->subdev = NULL;
          }
          return (1);                     /* failure */
  }
  
  /*------------------------------------------------------------------------*
   *      usbd_set_parent_iface
   *
   * Using this function will lock the alternate interface setting on an
   * interface. It is typically used for multi interface drivers. In USB
   * device side mode it is assumed that the alternate interfaces all
   * have the same endpoint descriptors. The default parent index value
   * is "USB_IFACE_INDEX_ANY". Then the alternate setting value is not
   * locked.
   *------------------------------------------------------------------------*/
  void
  usbd_set_parent_iface(struct usb_device *udev, uint8_t iface_index,
      uint8_t parent_index)
  {
          struct usb_interface *iface;
  
          if (udev == NULL) {
                  /* nothing to do */
                  return;
          }
          iface = usbd_get_iface(udev, iface_index);
          if (iface != NULL)
                  iface->parent_iface_index = parent_index;
  }
  
  static void
  usb_init_attach_arg(struct usb_device *udev,
      struct usb_attach_arg *uaa)
  {
          memset(uaa, 0, sizeof(*uaa));
  
          uaa->device = udev;
          uaa->usb_mode = udev->flags.usb_mode;
          uaa->port = udev->port_no;
          uaa->dev_state = UAA_DEV_READY;
  
          uaa->info.idVendor = UGETW(udev->ddesc.idVendor);
          uaa->info.idProduct = UGETW(udev->ddesc.idProduct);
          uaa->info.bcdDevice = UGETW(udev->ddesc.bcdDevice);
          uaa->info.bDeviceClass = udev->ddesc.bDeviceClass;
          uaa->info.bDeviceSubClass = udev->ddesc.bDeviceSubClass;
          uaa->info.bDeviceProtocol = udev->ddesc.bDeviceProtocol;
          uaa->info.bConfigIndex = udev->curr_config_index;
          uaa->info.bConfigNum = udev->curr_config_no;
  }
  
  /*------------------------------------------------------------------------*
   *      usb_probe_and_attach
   *
   * This function is called from "uhub_explore_sub()",
   * "usb_handle_set_config()" and "usb_handle_request()".
   *
   * Returns:
   *    0: Success
   * Else: A control transfer failed
   *------------------------------------------------------------------------*/
  usb_error_t
  usb_probe_and_attach(struct usb_device *udev, uint8_t iface_index)
  {
          struct usb_attach_arg uaa;
          struct usb_interface *iface;
          uint8_t i;
          uint8_t j;
          uint8_t do_unlock;
  
          if (udev == NULL) {
                  DPRINTF("udev == NULL\n");
                  return (USB_ERR_INVAL);
          }
          /* Prevent re-enumeration */
          do_unlock = usbd_enum_lock(udev);
  
          if (udev->curr_config_index == USB_UNCONFIG_INDEX) {
                  /* do nothing - no configuration has been set */
                  goto done;
          }
          /* setup USB attach arguments */
  
          usb_init_attach_arg(udev, &uaa);
  
          /*
           * If the whole USB device is targeted, invoke the USB event
           * handler(s):
           */
          if (iface_index == USB_IFACE_INDEX_ANY) {
  
                  if (usb_test_quirk(&uaa, UQ_MSC_DYMO_EJECT) != 0 &&
                      usb_dymo_eject(udev, 0) == 0) {
                          /* success, mark the udev as disappearing */
                          uaa.dev_state = UAA_DEV_EJECTING;
                  }
  
                  EVENTHANDLER_INVOKE(usb_dev_configured, udev, &uaa);
  
                  if (uaa.dev_state != UAA_DEV_READY) {
                          /* leave device unconfigured */
                          usb_unconfigure(udev, 0);
                          goto done;
                  }
          }
  
          /* Check if only one interface should be probed: */
          if (iface_index != USB_IFACE_INDEX_ANY) {
                  i = iface_index;
                  j = i + 1;
          } else {
                  i = 0;
                  j = USB_IFACE_MAX;
          }
  
          /* Do the probe and attach */
          for (; i != j; i++) {
  
                  iface = usbd_get_iface(udev, i);
                  if (iface == NULL) {
                          /*
                           * Looks like the end of the USB
                           * interfaces !
                           */
                          DPRINTFN(2, "end of interfaces "
                              "at %u\n", i);
                          break;
                  }
                  if (iface->idesc == NULL) {
                          /* no interface descriptor */
                          continue;
                  }
                  uaa.iface = iface;
  
                  uaa.info.bInterfaceClass =
                      iface->idesc->bInterfaceClass;
                  uaa.info.bInterfaceSubClass =
                      iface->idesc->bInterfaceSubClass;
                  uaa.info.bInterfaceProtocol =
                      iface->idesc->bInterfaceProtocol;
                  uaa.info.bIfaceIndex = i;
                  uaa.info.bIfaceNum =
                      iface->idesc->bInterfaceNumber;
                  uaa.driver_info = 0;    /* reset driver_info */
  
                  DPRINTFN(2, "iclass=%u/%u/%u iindex=%u/%u\n",
                      uaa.info.bInterfaceClass,
                      uaa.info.bInterfaceSubClass,
                      uaa.info.bInterfaceProtocol,
                      uaa.info.bIfaceIndex,
                      uaa.info.bIfaceNum);
  
                  usb_probe_and_attach_sub(udev, &uaa);
  
                  /*
                   * Remove the leftover child, if any, to enforce that
                   * a new nomatch devd event is generated for the next
                   * interface if no driver is found:
                   */
                  if (uaa.temp_dev == NULL)
                          continue;
                  if (device_delete_child(udev->parent_dev, uaa.temp_dev))
                          DPRINTFN(0, "device delete child failed\n");
                  uaa.temp_dev = NULL;
          }
  done:
          if (do_unlock)
                  usbd_enum_unlock(udev);
          return (0);
  }
  
  /*------------------------------------------------------------------------*
   *      usb_suspend_resume_sub
   *
   * This function is called when the suspend or resume methods should
   * be executed on an USB device.
   *------------------------------------------------------------------------*/
  static void
  usb_suspend_resume_sub(struct usb_device *udev, device_t dev, uint8_t do_suspend)
  {
          int err;
  
          if (dev == NULL) {
                  return;
          }
          if (!device_is_attached(dev)) {
                  return;
          }
          if (do_suspend) {
                  err = DEVICE_SUSPEND(dev);
          } else {
                  err = DEVICE_RESUME(dev);
          }
          if (err) {
                  device_printf(dev, "%s failed\n",
                      do_suspend ? "Suspend" : "Resume");
          }
  }
  
  /*------------------------------------------------------------------------*
   *      usb_suspend_resume
   *
   * The following function will suspend or resume the USB device.
   *
   * Returns:
   *    0: Success
   * Else: Failure
   *------------------------------------------------------------------------*/
  usb_error_t
  usb_suspend_resume(struct usb_device *udev, uint8_t do_suspend)
  {
          struct usb_interface *iface;
          uint8_t i;
  
          if (udev == NULL) {
                  /* nothing to do */
                  return (0);
          }
          DPRINTFN(4, "udev=%p do_suspend=%d\n", udev, do_suspend);
  
          sx_assert(&udev->sr_sx, SA_LOCKED);
  
          USB_BUS_LOCK(udev->bus);
          /* filter the suspend events */
          if (udev->flags.peer_suspended == do_suspend) {
                  USB_BUS_UNLOCK(udev->bus);
                  /* nothing to do */
                  return (0);
          }
          udev->flags.peer_suspended = do_suspend;
          USB_BUS_UNLOCK(udev->bus);
  
          /* do the suspend or resume */
  
          for (i = 0; i != USB_IFACE_MAX; i++) {
  
                  iface = usbd_get_iface(udev, i);
                  if (iface == NULL) {
                          /* looks like the end of the USB interfaces */
                          break;
                  }
                  usb_suspend_resume_sub(udev, iface->subdev, do_suspend);
          }
          return (0);
  }
  
  /*------------------------------------------------------------------------*
   *      usbd_clear_stall_proc
   *
   * This function performs generic USB clear stall operations.
   *------------------------------------------------------------------------*/
  static void
  usbd_clear_stall_proc(struct usb_proc_msg *_pm)
  {
          struct usb_udev_msg *pm = (void *)_pm;
          struct usb_device *udev = pm->udev;
  
          /* Change lock */
          USB_BUS_UNLOCK(udev->bus);
          mtx_lock(&udev->device_mtx);
  
          /* Start clear stall callback */
          usbd_transfer_start(udev->ctrl_xfer[1]);
  
          /* Change lock */
          mtx_unlock(&udev->device_mtx);
          USB_BUS_LOCK(udev->bus);
  }
  
  /*------------------------------------------------------------------------*
   *      usb_alloc_device
   *
   * This function allocates a new USB device. This function is called
   * when a new device has been put in the powered state, but not yet in
   * the addressed state. Get initial descriptor, set the address, get
   * full descriptor and get strings.
   *
   * Return values:
   *    0: Failure
   * Else: Success
   *------------------------------------------------------------------------*/
  struct usb_device *
  usb_alloc_device(device_t parent_dev, struct usb_bus *bus,
      struct usb_device *parent_hub, uint8_t depth, uint8_t port_index,
      uint8_t port_no, enum usb_dev_speed speed, enum usb_hc_mode mode)
  {
          struct usb_attach_arg uaa;
          struct usb_device *udev;
          struct usb_device *adev;
          struct usb_device *hub;
          uint8_t *scratch_ptr;
          usb_error_t err;
          uint8_t device_index;
          uint8_t config_index;
          uint8_t config_quirk;
          uint8_t set_config_failed;
          uint8_t do_unlock;
  
          DPRINTF("parent_dev=%p, bus=%p, parent_hub=%p, depth=%u, "
              "port_index=%u, port_no=%u, speed=%u, usb_mode=%u\n",
              parent_dev, bus, parent_hub, depth, port_index, port_no,
              speed, mode);
  
          /*
           * Find an unused device index. In USB Host mode this is the
           * same as the device address.
           *
           * Device index zero is not used and device index 1 should
           * always be the root hub.
           */
          for (device_index = USB_ROOT_HUB_ADDR;
              (device_index != bus->devices_max) &&
              (bus->devices[device_index] != NULL);
              device_index++) /* nop */;
  
          if (device_index == bus->devices_max) {
                  device_printf(bus->bdev,
                      "No free USB device index for new device\n");
                  return (NULL);
          }
  
          if (depth > 0x10) {
                  device_printf(bus->bdev,
                      "Invalid device depth\n");
                  return (NULL);
          }
          udev = malloc(sizeof(*udev), M_USB, M_WAITOK | M_ZERO);
          if (udev == NULL) {
                  return (NULL);
          }
          /* initialise our SX-lock */
          sx_init_flags(&udev->enum_sx, "USB config SX lock", SX_DUPOK);
          sx_init_flags(&udev->sr_sx, "USB suspend and resume SX lock", SX_NOWITNESS);
          sx_init_flags(&udev->ctrl_sx, "USB control transfer SX lock", SX_DUPOK);
  
          cv_init(&udev->ctrlreq_cv, "WCTRL");
          cv_init(&udev->ref_cv, "UGONE");
  
          /* initialise our mutex */
          mtx_init(&udev->device_mtx, "USB device mutex", NULL, MTX_DEF);
  
          /* initialise generic clear stall */
          udev->cs_msg[0].hdr.pm_callback = &usbd_clear_stall_proc;
          udev->cs_msg[0].udev = udev;
          udev->cs_msg[1].hdr.pm_callback = &usbd_clear_stall_proc;
          udev->cs_msg[1].udev = udev;
  
          /* initialise some USB device fields */
          udev->parent_hub = parent_hub;
          udev->parent_dev = parent_dev;
          udev->port_index = port_index;
          udev->port_no = port_no;
          udev->depth = depth;
          udev->bus = bus;
          udev->address = USB_START_ADDR; /* default value */
          udev->plugtime = (usb_ticks_t)ticks;
          /*
           * We need to force the power mode to "on" because there are plenty
           * of USB devices out there that do not work very well with
           * automatic suspend and resume!
           */
          udev->power_mode = usbd_filter_power_mode(udev, USB_POWER_MODE_ON);
          udev->pwr_save.last_xfer_time = ticks;
          /* we are not ready yet */
          udev->refcount = 1;
  
          /* set up default endpoint descriptor */
          udev->ctrl_ep_desc.bLength = sizeof(udev->ctrl_ep_desc);
          udev->ctrl_ep_desc.bDescriptorType = UDESC_ENDPOINT;
          udev->ctrl_ep_desc.bEndpointAddress = USB_CONTROL_ENDPOINT;
          udev->ctrl_ep_desc.bmAttributes = UE_CONTROL;
          udev->ctrl_ep_desc.wMaxPacketSize[0] = USB_MAX_IPACKET;
          udev->ctrl_ep_desc.wMaxPacketSize[1] = 0;
          udev->ctrl_ep_desc.bInterval = 0;
  
          /* set up default endpoint companion descriptor */
          udev->ctrl_ep_comp_desc.bLength = sizeof(udev->ctrl_ep_comp_desc);
          udev->ctrl_ep_comp_desc.bDescriptorType = UDESC_ENDPOINT_SS_COMP;
  
          udev->ddesc.bMaxPacketSize = USB_MAX_IPACKET;
  
          udev->speed = speed;
          udev->flags.usb_mode = mode;
  
          /* search for our High Speed USB HUB, if any */
  
          adev = udev;
          hub = udev->parent_hub;
  
          while (hub) {
                  if (hub->speed == USB_SPEED_HIGH) {
                          udev->hs_hub_addr = hub->address;
                          udev->parent_hs_hub = hub;
                          udev->hs_port_no = adev->port_no;
                          break;
                  }
                  adev = hub;
                  hub = hub->parent_hub;
          }
  
          /* init the default endpoint */
          usb_init_endpoint(udev, 0,
              &udev->ctrl_ep_desc,
              &udev->ctrl_ep_comp_desc,
              &udev->ctrl_ep);
  
          /* set device index */
          udev->device_index = device_index;
  
  #if USB_HAVE_UGEN
          /* Create ugen name */
          snprintf(udev->ugen_name, sizeof(udev->ugen_name),
              USB_GENERIC_NAME "%u.%u", device_get_unit(bus->bdev),
              device_index);
          LIST_INIT(&udev->pd_list);
  
          /* Create the control endpoint device */
          udev->ctrl_dev = usb_make_dev(udev, NULL, 0, 0,
              FREAD|FWRITE, UID_ROOT, GID_OPERATOR, 0600);
  
          /* Create a link from /dev/ugenX.X to the default endpoint */
          if (udev->ctrl_dev != NULL)
                  make_dev_alias(udev->ctrl_dev->cdev, "%s", udev->ugen_name);
  #endif
          /* Initialise device */
          if (bus->methods->device_init != NULL) {
                  err = (bus->methods->device_init) (udev);
                  if (err != 0) {
                          DPRINTFN(0, "device init %d failed "
                              "(%s, ignored)\n", device_index, 
                              usbd_errstr(err));
                          goto done;
                  }
          }
          /* set powered device state after device init is complete */
          usb_set_device_state(udev, USB_STATE_POWERED);
  
          if (udev->flags.usb_mode == USB_MODE_HOST) {
  
                  err = usbd_req_set_address(udev, NULL, device_index);
  
                  /*
                   * This is the new USB device address from now on, if
                   * the set address request didn't set it already.
                   */
                  if (udev->address == USB_START_ADDR)
                          udev->address = device_index;
  
                  /*
                   * We ignore any set-address errors, hence there are
                   * buggy USB devices out there that actually receive
                   * the SETUP PID, but manage to set the address before
                   * the STATUS stage is ACK'ed. If the device responds
                   * to the subsequent get-descriptor at the new
                   * address, then we know that the set-address command
                   * was successful.
                   */
                  if (err) {
                          DPRINTFN(0, "set address %d failed "
                              "(%s, ignored)\n", udev->address, 
                              usbd_errstr(err));
                  }
          } else {
                  /* We are not self powered */
                  udev->flags.self_powered = 0;
  
                  /* Set unconfigured state */
                  udev->curr_config_no = USB_UNCONFIG_NO;
                  udev->curr_config_index = USB_UNCONFIG_INDEX;
  
                  /* Setup USB descriptors */
                  err = (usb_temp_setup_by_index_p) (udev, usb_template);
                  if (err) {
                          DPRINTFN(0, "setting up USB template failed - "
                              "usb_template(4) not loaded?\n");
                          goto done;
                  }
          }
          usb_set_device_state(udev, USB_STATE_ADDRESSED);
  
          /* setup the device descriptor and the initial "wMaxPacketSize" */
          err = usbd_setup_device_desc(udev, NULL);
  
          if (err != 0) {
                  /* try to enumerate two more times */
                  err = usbd_req_re_enumerate(udev, NULL);
                  if (err != 0) {
                          err = usbd_req_re_enumerate(udev, NULL);
                          if (err != 0) {
                                  goto done;
                          }
                  }
          }
  
          /*
           * Setup temporary USB attach args so that we can figure out some
           * basic quirks for this device.
           */
          usb_init_attach_arg(udev, &uaa);
  
          if (usb_test_quirk(&uaa, UQ_BUS_POWERED)) {
                  udev->flags.uq_bus_powered = 1;
          }
          if (usb_test_quirk(&uaa, UQ_NO_STRINGS)) {
                  udev->flags.no_strings = 1;
          }
          /*
           * Workaround for buggy USB devices.
           *
           * It appears that some string-less USB chips will crash and
           * disappear if any attempts are made to read any string
           * descriptors.
           *
           * Try to detect such chips by checking the strings in the USB
           * device descriptor. If no strings are present there we
           * simply disable all USB strings.
           */
  
          /* Protect scratch area */
          do_unlock = usbd_ctrl_lock(udev);
  
          scratch_ptr = udev->scratch.data;
  
          if (udev->flags.no_strings) {
                  err = USB_ERR_INVAL;
          } else if (udev->ddesc.iManufacturer ||
              udev->ddesc.iProduct ||
              udev->ddesc.iSerialNumber) {
                  /* read out the language ID string */
                  err = usbd_req_get_string_desc(udev, NULL,
                      (char *)scratch_ptr, 4, 0, USB_LANGUAGE_TABLE);
          } else {
                  err = USB_ERR_INVAL;
          }
  
          if (err || (scratch_ptr[0] < 4)) {
                  udev->flags.no_strings = 1;
          } else {
                  uint16_t langid;
                  uint16_t pref;
                  uint16_t mask;
                  uint8_t x;
  
                  /* load preferred value and mask */
                  pref = usb_lang_id;
                  mask = usb_lang_mask;
  
                  /* align length correctly */
                  scratch_ptr[0] &= ~1U;
  
                  /* fix compiler warning */
                  langid = 0;
  
                  /* search for preferred language */
                  for (x = 2; (x < scratch_ptr[0]); x += 2) {
                          langid = UGETW(scratch_ptr + x);
                          if ((langid & mask) == pref)
                                  break;
                  }
                  if (x >= scratch_ptr[0]) {
                          /* pick the first language as the default */
                          DPRINTFN(1, "Using first language\n");
                          langid = UGETW(scratch_ptr + 2);
                  }
  
                  DPRINTFN(1, "Language selected: 0x%04x\n", langid);
                  udev->langid = langid;
          }
  
          if (do_unlock)
                  usbd_ctrl_unlock(udev);
  
          /* assume 100mA bus powered for now. Changed when configured. */
          udev->power = USB_MIN_POWER;
          /* fetch the vendor and product strings from the device */
          usbd_set_device_strings(udev);
  
          if (udev->flags.usb_mode == USB_MODE_DEVICE) {
                  /* USB device mode setup is complete */
                  err = 0;
                  goto config_done;
          }
  
          /*
           * Most USB devices should attach to config index 0 by
           * default
           */
          if (usb_test_quirk(&uaa, UQ_CFG_INDEX_0)) {
                  config_index = 0;
                  config_quirk = 1;
          } else if (usb_test_quirk(&uaa, UQ_CFG_INDEX_1)) {
                  config_index = 1;
                  config_quirk = 1;
          } else if (usb_test_quirk(&uaa, UQ_CFG_INDEX_2)) {
                  config_index = 2;
                  config_quirk = 1;
          } else if (usb_test_quirk(&uaa, UQ_CFG_INDEX_3)) {
                  config_index = 3;
                  config_quirk = 1;
          } else if (usb_test_quirk(&uaa, UQ_CFG_INDEX_4)) {
                  config_index = 4;
                  config_quirk = 1;
          } else {
                  config_index = 0;
                  config_quirk = 0;
          }
  
          set_config_failed = 0;
  repeat_set_config:
  
          DPRINTF("setting config %u\n", config_index);
  
          /* get the USB device configured */
          err = usbd_set_config_index(udev, config_index);
          if (err) {
                  if (udev->ddesc.bNumConfigurations != 0) {
                          if (!set_config_failed) {
                                  set_config_failed = 1;
                                  /* XXX try to re-enumerate the device */
                                  err = usbd_req_re_enumerate(udev, NULL);
                                  if (err == 0)
                                          goto repeat_set_config;
                          }
                          DPRINTFN(0, "Failure selecting configuration index %u:"
                              "%s, port %u, addr %u (ignored)\n",
                              config_index, usbd_errstr(err), udev->port_no,
                              udev->address);
                  }
                  /*
                   * Some USB devices do not have any configurations. Ignore any
                   * set config failures!
                   */
                  err = 0;
                  goto config_done;
          }
          if (!config_quirk && config_index + 1 < udev->ddesc.bNumConfigurations) {
                  if ((udev->cdesc->bNumInterface < 2) &&
                      usbd_get_no_descriptors(udev->cdesc, UDESC_ENDPOINT) == 0) {
                          DPRINTFN(0, "Found no endpoints, trying next config\n");
                          config_index++;
                          goto repeat_set_config;
                  }
  #if USB_HAVE_MSCTEST
                  if (config_index == 0) {
                          /*
                           * Try to figure out if we have an
                           * auto-install disk there:
                           */
                          if (usb_iface_is_cdrom(udev, 0)) {
                                  DPRINTFN(0, "Found possible auto-install "
                                      "disk (trying next config)\n");
                                  config_index++;
                                  goto repeat_set_config;
                          }
                  }
  #endif
          }
  #if USB_HAVE_MSCTEST
          if (set_config_failed == 0 && config_index == 0 &&
              usb_test_quirk(&uaa, UQ_MSC_NO_SYNC_CACHE) == 0 &&
              usb_test_quirk(&uaa, UQ_MSC_NO_GETMAXLUN) == 0) {
  
                  /*
                   * Try to figure out if there are any MSC quirks we
                   * should apply automatically:
                   */
                  err = usb_msc_auto_quirk(udev, 0);
  
                  if (err != 0) {
                          set_config_failed = 1;
                          goto repeat_set_config;
                  }
          }
  #endif
  
  config_done:
          DPRINTF("new dev (addr %d), udev=%p, parent_hub=%p\n",
              udev->address, udev, udev->parent_hub);
  
          /* register our device - we are ready */
          usb_bus_port_set_device(bus, parent_hub ?
              parent_hub->hub->ports + port_index : NULL, udev, device_index);
  
  #if USB_HAVE_UGEN
          /* Symlink the ugen device name */
          udev->ugen_symlink = usb_alloc_symlink(udev->ugen_name);
  
          /* Announce device */
          printf("%s: <%s %s> at %s\n", udev->ugen_name,
              usb_get_manufacturer(udev), usb_get_product(udev),
              device_get_nameunit(udev->bus->bdev));
  #endif
  
  #if USB_HAVE_DEVCTL
          usb_notify_addq("ATTACH", udev);
  #endif
  done:
          if (err) {
                  /*
                   * Free USB device and all subdevices, if any.
                   */
                  usb_free_device(udev, 0);
                  udev = NULL;
          }
          return (udev);
  }
  
  #if USB_HAVE_UGEN
  struct usb_fs_privdata *
  usb_make_dev(struct usb_device *udev, const char *devname, int ep,
      int fi, int rwmode, uid_t uid, gid_t gid, int mode)
  {
          struct usb_fs_privdata* pd;
          struct make_dev_args args;
          char buffer[32];
  
          /* Store information to locate ourselves again later */
          pd = malloc(sizeof(struct usb_fs_privdata), M_USBDEV,
              M_WAITOK | M_ZERO);
          pd->bus_index = device_get_unit(udev->bus->bdev);
          pd->dev_index = udev->device_index;
          pd->ep_addr = ep;
          pd->fifo_index = fi;
          pd->mode = rwmode;
  
          /* Now, create the device itself */
          if (devname == NULL) {
                  devname = buffer;
                  snprintf(buffer, sizeof(buffer), USB_DEVICE_DIR "/%u.%u.%u",
                      pd->bus_index, pd->dev_index, pd->ep_addr);
          }
  
          /* Setup arguments for make_dev_s() */
          make_dev_args_init(&args);
          args.mda_devsw = &usb_devsw;
          args.mda_uid = uid;
          args.mda_gid = gid;
          args.mda_mode = mode;
          args.mda_si_drv1 = pd;
  
          if (make_dev_s(&args, &pd->cdev, "%s", devname) != 0) {
                  DPRINTFN(0, "Failed to create device %s\n", devname);
                  free(pd, M_USBDEV);
                  return (NULL);
          }
          return (pd);
  }
  
  void
  usb_destroy_dev_sync(struct usb_fs_privdata *pd)
  {
          DPRINTFN(1, "Destroying device at ugen%d.%d\n",
              pd->bus_index, pd->dev_index);
  
          /*
           * Destroy character device synchronously. After this
           * all system calls are returned. Can block.
           */
          destroy_dev(pd->cdev);
  
          free(pd, M_USBDEV);
  }
  
  void
  usb_destroy_dev(struct usb_fs_privdata *pd)
  {
          struct usb_bus *bus;
  
          if (pd == NULL)
                  return;
  
          mtx_lock(&usb_ref_lock);
          bus = devclass_get_softc(usb_devclass_ptr, pd->bus_index);
          mtx_unlock(&usb_ref_lock);
  
          if (bus == NULL) {
                  usb_destroy_dev_sync(pd);
                  return;
          }
  
          /* make sure we can re-use the device name */
          delist_dev(pd->cdev);
  
          USB_BUS_LOCK(bus);
          LIST_INSERT_HEAD(&bus->pd_cleanup_list, pd, pd_next);
          /* get cleanup going */
          usb_proc_msignal(USB_BUS_EXPLORE_PROC(bus),
              &bus->cleanup_msg[0], &bus->cleanup_msg[1]);
          USB_BUS_UNLOCK(bus);
  }
  
  static void
  usb_cdev_create(struct usb_device *udev)
  {
          struct usb_config_descriptor *cd;
          struct usb_endpoint_descriptor *ed;
          struct usb_descriptor *desc;
          struct usb_fs_privdata* pd;
          int inmode, outmode, inmask, outmask, mode;
          uint8_t ep;
  
          KASSERT(LIST_FIRST(&udev->pd_list) == NULL, ("stale cdev entries"));
  
          DPRINTFN(2, "Creating device nodes\n");
  
          if (usbd_get_mode(udev) == USB_MODE_DEVICE) {
                  inmode = FWRITE;
                  outmode = FREAD;
          } else {                 /* USB_MODE_HOST */
                  inmode = FREAD;
                  outmode = FWRITE;
          }
  
          inmask = 0;
          outmask = 0;
          desc = NULL;
  
          /*
           * Collect all used endpoint numbers instead of just
           * generating 16 static endpoints.
           */
          cd = usbd_get_config_descriptor(udev);
          while ((desc = usb_desc_foreach(cd, desc))) {
                  /* filter out all endpoint descriptors */
                  if ((desc->bDescriptorType == UDESC_ENDPOINT) &&
                      (desc->bLength >= sizeof(*ed))) {
                          ed = (struct usb_endpoint_descriptor *)desc;
  
                          /* update masks */
                          ep = ed->bEndpointAddress;
                          if (UE_GET_DIR(ep)  == UE_DIR_OUT)
                                  outmask |= 1 << UE_GET_ADDR(ep);
                          else
                                  inmask |= 1 << UE_GET_ADDR(ep);
                  }
          }
  
          /* Create all available endpoints except EP0 */
          for (ep = 1; ep < 16; ep++) {
                  mode = (inmask & (1 << ep)) ? inmode : 0;
                  mode |= (outmask & (1 << ep)) ? outmode : 0;
                  if (mode == 0)
                          continue;       /* no IN or OUT endpoint */
  
                  pd = usb_make_dev(udev, NULL, ep, 0,
                      mode, UID_ROOT, GID_OPERATOR, 0600);
  
                  if (pd != NULL)
                          LIST_INSERT_HEAD(&udev->pd_list, pd, pd_next);
          }
  }
  
  static void
  usb_cdev_free(struct usb_device *udev)
  {
          struct usb_fs_privdata* pd;
  
          DPRINTFN(2, "Freeing device nodes\n");
  
          while ((pd = LIST_FIRST(&udev->pd_list)) != NULL) {
                  KASSERT(pd->cdev->si_drv1 == pd, ("privdata corrupt"));
  
                  LIST_REMOVE(pd, pd_next);
  
                  usb_destroy_dev(pd);
          }
  }
  #endif
  
  /*------------------------------------------------------------------------*
   *      usb_free_device
   *
   * This function is NULL safe and will free an USB device and its
   * children devices, if any.
   *
   * Flag values: Reserved, set to zero.
   *------------------------------------------------------------------------*/
  void
  usb_free_device(struct usb_device *udev, uint8_t flag)
  {
          struct usb_bus *bus;
  
          if (udev == NULL)
                  return;         /* already freed */
  
          DPRINTFN(4, "udev=%p port=%d\n", udev, udev->port_no);
  
          bus = udev->bus;
  
          /* set DETACHED state to prevent any further references */
          usb_set_device_state(udev, USB_STATE_DETACHED);
  
  #if USB_HAVE_DEVCTL
          usb_notify_addq("DETACH", udev);
  #endif
  
  #if USB_HAVE_UGEN
          if (!rebooting) {
                  printf("%s: <%s %s> at %s (disconnected)\n", udev->ugen_name,
                      usb_get_manufacturer(udev), usb_get_product(udev),
                      device_get_nameunit(bus->bdev));
          }
  
          /* Destroy UGEN symlink, if any */
          if (udev->ugen_symlink) {
                  usb_free_symlink(udev->ugen_symlink);
                  udev->ugen_symlink = NULL;
          }
  
          usb_destroy_dev(udev->ctrl_dev);
  #endif
  
          if (udev->flags.usb_mode == USB_MODE_DEVICE) {
                  /* stop receiving any control transfers (Device Side Mode) */
                  usbd_transfer_unsetup(udev->ctrl_xfer, USB_CTRL_XFER_MAX);
          }
  
          /* the following will get the device unconfigured in software */
          usb_unconfigure(udev, USB_UNCFG_FLAG_FREE_EP0);
  
          /* final device unregister after all character devices are closed */
          usb_bus_port_set_device(bus, udev->parent_hub ?
              udev->parent_hub->hub->ports + udev->port_index : NULL,
              NULL, USB_ROOT_HUB_ADDR);
  
          /* unsetup any leftover default USB transfers */
          usbd_transfer_unsetup(udev->ctrl_xfer, USB_CTRL_XFER_MAX);
  
          /* template unsetup, if any */
          (usb_temp_unsetup_p) (udev);
  
          /* 
           * Make sure that our clear-stall messages are not queued
           * anywhere:
           */
          USB_BUS_LOCK(udev->bus);
          usb_proc_mwait(USB_BUS_CS_PROC(udev->bus),
              &udev->cs_msg[0], &udev->cs_msg[1]);
          USB_BUS_UNLOCK(udev->bus);
  
          /* wait for all references to go away */
          usb_wait_pending_refs(udev);
          
          sx_destroy(&udev->enum_sx);
          sx_destroy(&udev->sr_sx);
          sx_destroy(&udev->ctrl_sx);
  
          cv_destroy(&udev->ctrlreq_cv);
          cv_destroy(&udev->ref_cv);
  
          mtx_destroy(&udev->device_mtx);
  #if USB_HAVE_UGEN
          KASSERT(LIST_FIRST(&udev->pd_list) == NULL, ("leaked cdev entries"));
  #endif
  
          /* Uninitialise device */
          if (bus->methods->device_uninit != NULL)
                  (bus->methods->device_uninit) (udev);
  
          /* free device */
          free(udev->serial, M_USB);
          free(udev->manufacturer, M_USB);
          free(udev->product, M_USB);
          free(udev, M_USB);
  }
  
  /*------------------------------------------------------------------------*
   *      usbd_get_iface
   *
   * This function is the safe way to get the USB interface structure
   * pointer by interface index.
   *
   * Return values:
   *   NULL: Interface not present.
   *   Else: Pointer to USB interface structure.
   *------------------------------------------------------------------------*/
  struct usb_interface *
  usbd_get_iface(struct usb_device *udev, uint8_t iface_index)
  {
          struct usb_interface *iface = udev->ifaces + iface_index;
  
          if (iface_index >= udev->ifaces_max)
                  return (NULL);
          return (iface);
  }
  
  /*------------------------------------------------------------------------*
   *      usbd_find_descriptor
   *
   * This function will lookup the first descriptor that matches the
   * criteria given by the arguments "type" and "subtype". Descriptors
   * will only be searched within the interface having the index
   * "iface_index".  If the "id" argument points to an USB descriptor,
   * it will be skipped before the search is started. This allows
   * searching for multiple descriptors using the same criteria. Else
   * the search is started after the interface descriptor.
   *
   * Return values:
   *   NULL: End of descriptors
   *   Else: A descriptor matching the criteria
   *------------------------------------------------------------------------*/
  void   *
  usbd_find_descriptor(struct usb_device *udev, void *id, uint8_t iface_index,
      uint8_t type, uint8_t type_mask,
      uint8_t subtype, uint8_t subtype_mask)
  {
          struct usb_descriptor *desc;
          struct usb_config_descriptor *cd;
          struct usb_interface *iface;
  
          cd = usbd_get_config_descriptor(udev);
          if (cd == NULL) {
                  return (NULL);
          }
          if (id == NULL) {
                  iface = usbd_get_iface(udev, iface_index);
                  if (iface == NULL) {
                          return (NULL);
                  }
                  id = usbd_get_interface_descriptor(iface);
                  if (id == NULL) {
                          return (NULL);
                  }
          }
          desc = (void *)id;
  
          while ((desc = usb_desc_foreach(cd, desc))) {
  
                  if (desc->bDescriptorType == UDESC_INTERFACE) {
                          break;
                  }
                  if (((desc->bDescriptorType & type_mask) == type) &&
                      ((desc->bDescriptorSubtype & subtype_mask) == subtype)) {
                          return (desc);
                  }
          }
          return (NULL);
  }
  
  /*------------------------------------------------------------------------*
   *      usb_devinfo
   *
   * This function will dump information from the device descriptor
   * belonging to the USB device pointed to by "udev", to the string
   * pointed to by "dst_ptr" having a maximum length of "dst_len" bytes
   * including the terminating zero.
   *------------------------------------------------------------------------*/
  void
  usb_devinfo(struct usb_device *udev, char *dst_ptr, uint16_t dst_len)
  {
          struct usb_device_descriptor *udd = &udev->ddesc;
          uint16_t bcdDevice;
          uint16_t bcdUSB;
  
          bcdUSB = UGETW(udd->bcdUSB);
          bcdDevice = UGETW(udd->bcdDevice);
  
          if (udd->bDeviceClass != 0xFF) {
                  snprintf(dst_ptr, dst_len, "%s %s, class %d/%d, rev %x.%02x/"
                      "%x.%02x, addr %d",
                      usb_get_manufacturer(udev),
                      usb_get_product(udev),
                      udd->bDeviceClass, udd->bDeviceSubClass,
                      (bcdUSB >> 8), bcdUSB & 0xFF,
                      (bcdDevice >> 8), bcdDevice & 0xFF,
                      udev->address);
          } else {
                  snprintf(dst_ptr, dst_len, "%s %s, rev %x.%02x/"
                      "%x.%02x, addr %d",
                      usb_get_manufacturer(udev),
                      usb_get_product(udev),
                      (bcdUSB >> 8), bcdUSB & 0xFF,
                      (bcdDevice >> 8), bcdDevice & 0xFF,
                      udev->address);
          }
  }
  
  #ifdef USB_VERBOSE
  /*
   * Descriptions of of known vendors and devices ("products").
   */
  struct usb_knowndev {
          uint16_t vendor;
          uint16_t product;
          uint32_t flags;
          const char *vendorname;
          const char *productname;
  };
  
  #define USB_KNOWNDEV_NOPROD     0x01    /* match on vendor only */
  
  #include "usbdevs.h"
  #include "usbdevs_data.h"
  #endif                                  /* USB_VERBOSE */
  
  static void
  usbd_set_device_strings(struct usb_device *udev)
  {
          struct usb_device_descriptor *udd = &udev->ddesc;
  #ifdef USB_VERBOSE
          const struct usb_knowndev *kdp;
  #endif
          char *temp_ptr;
          size_t temp_size;
          uint16_t vendor_id;
          uint16_t product_id;
          uint8_t do_unlock;
  
          /* Protect scratch area */
          do_unlock = usbd_ctrl_lock(udev);
  
          temp_ptr = (char *)udev->scratch.data;
          temp_size = sizeof(udev->scratch.data);
  
          vendor_id = UGETW(udd->idVendor);
          product_id = UGETW(udd->idProduct);
  
          /* get serial number string */
          usbd_req_get_string_any(udev, NULL, temp_ptr, temp_size,
              udev->ddesc.iSerialNumber);
          udev->serial = strdup(temp_ptr, M_USB);
  
          /* get manufacturer string */
          usbd_req_get_string_any(udev, NULL, temp_ptr, temp_size,
              udev->ddesc.iManufacturer);
          usb_trim_spaces(temp_ptr);
          if (temp_ptr[0] != '\0')
                  udev->manufacturer = strdup(temp_ptr, M_USB);
  
          /* get product string */
          usbd_req_get_string_any(udev, NULL, temp_ptr, temp_size,
              udev->ddesc.iProduct);
          usb_trim_spaces(temp_ptr);
          if (temp_ptr[0] != '\0')
                  udev->product = strdup(temp_ptr, M_USB);
  
  #ifdef USB_VERBOSE
          if (udev->manufacturer == NULL || udev->product == NULL) {
                  for (kdp = usb_knowndevs; kdp->vendorname != NULL; kdp++) {
                          if (kdp->vendor == vendor_id &&
                              (kdp->product == product_id ||
                              (kdp->flags & USB_KNOWNDEV_NOPROD) != 0))
                                  break;
                  }
                  if (kdp->vendorname != NULL) {
                          /* XXX should use pointer to knowndevs string */
                          if (udev->manufacturer == NULL) {
                                  udev->manufacturer = strdup(kdp->vendorname,
                                      M_USB);
                          }
                          if (udev->product == NULL &&
                              (kdp->flags & USB_KNOWNDEV_NOPROD) == 0) {
                                  udev->product = strdup(kdp->productname,
                                      M_USB);
                          }
                  }
          }
  #endif
          /* Provide default strings if none were found */
          if (udev->manufacturer == NULL) {
                  snprintf(temp_ptr, temp_size, "vendor 0x%04x", vendor_id);
                  udev->manufacturer = strdup(temp_ptr, M_USB);
          }
          if (udev->product == NULL) {
                  snprintf(temp_ptr, temp_size, "product 0x%04x", product_id);
                  udev->product = strdup(temp_ptr, M_USB);
          }
  
          if (do_unlock)
                  usbd_ctrl_unlock(udev);
  }
  
  /*
   * Returns:
   * See: USB_MODE_XXX
   */
  enum usb_hc_mode
  usbd_get_mode(struct usb_device *udev)
  {
          return (udev->flags.usb_mode);
  }
  
  /*
   * Returns:
   * See: USB_SPEED_XXX
   */
  enum usb_dev_speed
  usbd_get_speed(struct usb_device *udev)
  {
          return (udev->speed);
  }
  
  uint32_t
  usbd_get_isoc_fps(struct usb_device *udev)
  {
          ;                               /* indent fix */
          switch (udev->speed) {
          case USB_SPEED_LOW:
          case USB_SPEED_FULL:
                  return (1000);
          default:
                  return (8000);
          }
  }
  
  struct usb_device_descriptor *
  usbd_get_device_descriptor(struct usb_device *udev)
  {
          if (udev == NULL)
                  return (NULL);          /* be NULL safe */
          return (&udev->ddesc);
  }
  
  struct usb_config_descriptor *
  usbd_get_config_descriptor(struct usb_device *udev)
  {
          if (udev == NULL)
                  return (NULL);          /* be NULL safe */
          return (udev->cdesc);
  }
  
  /*------------------------------------------------------------------------*
   *      usb_test_quirk - test a device for a given quirk
   *
   * Return values:
   * 0: The USB device does not have the given quirk.
   * Else: The USB device has the given quirk.
   *------------------------------------------------------------------------*/
  uint8_t
  usb_test_quirk(const struct usb_attach_arg *uaa, uint16_t quirk)
  {
          uint8_t found;
          uint8_t x;
  
          if (quirk == UQ_NONE)
                  return (0);
  
          /* search the automatic per device quirks first */
  
          for (x = 0; x != USB_MAX_AUTO_QUIRK; x++) {
                  if (uaa->device->autoQuirk[x] == quirk)
                          return (1);
          }
  
          /* search global quirk table, if any */
  
          found = (usb_test_quirk_p) (&uaa->info, quirk);
  
          return (found);
  }
  
  struct usb_interface_descriptor *
  usbd_get_interface_descriptor(struct usb_interface *iface)
  {
          if (iface == NULL)
                  return (NULL);          /* be NULL safe */
          return (iface->idesc);
  }
  
  uint8_t
  usbd_get_interface_altindex(struct usb_interface *iface)
  {
          return (iface->alt_index);
  }
  
  uint8_t
  usbd_get_bus_index(struct usb_device *udev)
  {
          return ((uint8_t)device_get_unit(udev->bus->bdev));
  }
  
  uint8_t
  usbd_get_device_index(struct usb_device *udev)
  {
          return (udev->device_index);
  }
  
  #if USB_HAVE_DEVCTL
  static void
  usb_notify_addq(const char *type, struct usb_device *udev)
  {
          struct usb_interface *iface;
          struct sbuf *sb;
          int i;
  
          /* announce the device */
          sb = sbuf_new_auto();
          sbuf_printf(sb,
  #if USB_HAVE_UGEN
              "ugen=%s "
              "cdev=%s "
  #endif
              "vendor=0x%04x "
              "product=0x%04x "
              "devclass=0x%02x "
              "devsubclass=0x%02x "
              "sernum=\"%s\" "
              "release=0x%04x "
              "mode=%s "
              "port=%u "
  #if USB_HAVE_UGEN
              "parent=%s"
  #endif
              "",
  #if USB_HAVE_UGEN
              udev->ugen_name,
              udev->ugen_name,
  #endif
              UGETW(udev->ddesc.idVendor),
              UGETW(udev->ddesc.idProduct),
              udev->ddesc.bDeviceClass,
              udev->ddesc.bDeviceSubClass,
              usb_get_serial(udev),
              UGETW(udev->ddesc.bcdDevice),
              (udev->flags.usb_mode == USB_MODE_HOST) ? "host" : "device",
              udev->port_no
  #if USB_HAVE_UGEN
              , udev->parent_hub != NULL ?
                  udev->parent_hub->ugen_name :
                  device_get_nameunit(device_get_parent(udev->bus->bdev))
  #endif
              );
          sbuf_finish(sb);
          devctl_notify("USB", "DEVICE", type, sbuf_data(sb));
          sbuf_delete(sb);
  
          /* announce each interface */
          for (i = 0; i < USB_IFACE_MAX; i++) {
                  iface = usbd_get_iface(udev, i);
                  if (iface == NULL)
                          break;          /* end of interfaces */
                  if (iface->idesc == NULL)
                          continue;       /* no interface descriptor */
  
                  sb = sbuf_new_auto();
                  sbuf_printf(sb,
  #if USB_HAVE_UGEN
                      "ugen=%s "
                      "cdev=%s "
  #endif
                      "vendor=0x%04x "
                      "product=0x%04x "
                      "devclass=0x%02x "
                      "devsubclass=0x%02x "
                      "sernum=\"%s\" "
                      "release=0x%04x "
                      "mode=%s "
                      "interface=%d "
                      "endpoints=%d "
                      "intclass=0x%02x "
                      "intsubclass=0x%02x "
                      "intprotocol=0x%02x",
  #if USB_HAVE_UGEN
                      udev->ugen_name,
                      udev->ugen_name,
  #endif
                      UGETW(udev->ddesc.idVendor),
                      UGETW(udev->ddesc.idProduct),
                      udev->ddesc.bDeviceClass,
                      udev->ddesc.bDeviceSubClass,
                      usb_get_serial(udev),
                      UGETW(udev->ddesc.bcdDevice),
                      (udev->flags.usb_mode == USB_MODE_HOST) ? "host" : "device",
                      iface->idesc->bInterfaceNumber,
                      iface->idesc->bNumEndpoints,
                      iface->idesc->bInterfaceClass,
                      iface->idesc->bInterfaceSubClass,
                      iface->idesc->bInterfaceProtocol);
                  sbuf_finish(sb);
                  devctl_notify("USB", "INTERFACE", type, sbuf_data(sb));
                  sbuf_delete(sb);
          }
  }
  #endif
  
  #if USB_HAVE_UGEN
  /*------------------------------------------------------------------------*
   *      usb_fifo_free_wrap
   *
   * This function will free the FIFOs.
   *
   * Description of "flag" argument: If the USB_UNCFG_FLAG_FREE_EP0 flag
   * is set and "iface_index" is set to "USB_IFACE_INDEX_ANY", we free
   * all FIFOs. If the USB_UNCFG_FLAG_FREE_EP0 flag is not set and
   * "iface_index" is set to "USB_IFACE_INDEX_ANY", we free all non
   * control endpoint FIFOs. If "iface_index" is not set to
   * "USB_IFACE_INDEX_ANY" the flag has no effect.
   *------------------------------------------------------------------------*/
  static void
  usb_fifo_free_wrap(struct usb_device *udev,
      uint8_t iface_index, uint8_t flag)
  {
          struct usb_fifo *f;
          uint16_t i;
  
          /*
           * Free any USB FIFOs on the given interface:
           */
          for (i = 0; i != USB_FIFO_MAX; i++) {
                  f = udev->fifo[i];
                  if (f == NULL) {
                          continue;
                  }
                  /* Check if the interface index matches */
                  if (iface_index == f->iface_index) {
                          if (f->methods != &usb_ugen_methods) {
                                  /*
                                   * Don't free any non-generic FIFOs in
                                   * this case.
                                   */
                                  continue;
                          }
                          if ((f->dev_ep_index == 0) &&
                              (f->fs_xfer == NULL)) {
                                  /* no need to free this FIFO */
                                  continue;
                          }
                  } else if (iface_index == USB_IFACE_INDEX_ANY) {
                          if ((f->methods == &usb_ugen_methods) &&
                              (f->dev_ep_index == 0) &&
                              (!(flag & USB_UNCFG_FLAG_FREE_EP0)) &&
                              (f->fs_xfer == NULL)) {
                                  /* no need to free this FIFO */
                                  continue;
                          }
                  } else {
                          /* no need to free this FIFO */
                          continue;
                  }
                  /* free this FIFO */
                  usb_fifo_free(f);
          }
  }
  #endif
  
  /*------------------------------------------------------------------------*
   *      usb_peer_can_wakeup
   *
   * Return values:
   * 0: Peer cannot do resume signalling.
   * Else: Peer can do resume signalling.
   *------------------------------------------------------------------------*/
  uint8_t
  usb_peer_can_wakeup(struct usb_device *udev)
  {
          const struct usb_config_descriptor *cdp;
  
          cdp = udev->cdesc;
          if ((cdp != NULL) && (udev->flags.usb_mode == USB_MODE_HOST)) {
                  return (cdp->bmAttributes & UC_REMOTE_WAKEUP);
          }
          return (0);                     /* not supported */
  }
  
  void
  usb_set_device_state(struct usb_device *udev, enum usb_dev_state state)
  {
  
          KASSERT(state < USB_STATE_MAX, ("invalid udev state"));
  
          DPRINTF("udev %p state %s -> %s\n", udev,
              usb_statestr(udev->state), usb_statestr(state));
  
  #if USB_HAVE_UGEN
          mtx_lock(&usb_ref_lock);
  #endif
          udev->state = state;
  #if USB_HAVE_UGEN
          mtx_unlock(&usb_ref_lock);
  #endif
          if (udev->bus->methods->device_state_change != NULL)
                  (udev->bus->methods->device_state_change) (udev);
  }
  
  enum usb_dev_state
  usb_get_device_state(struct usb_device *udev)
  {
          if (udev == NULL)
                  return (USB_STATE_DETACHED);
          return (udev->state);
  }
  
  uint8_t
  usbd_device_attached(struct usb_device *udev)
  {
          return (udev->state > USB_STATE_DETACHED);
  }
  
  /*
   * The following function locks enumerating the given USB device. If
   * the lock is already grabbed this function returns zero. Else a
   * a value of one is returned.
   */
  uint8_t
  usbd_enum_lock(struct usb_device *udev)
  {
          if (sx_xlocked(&udev->enum_sx))
                  return (0);
  
          sx_xlock(&udev->enum_sx);
          sx_xlock(&udev->sr_sx);
          /* 
           * NEWBUS LOCK NOTE: We should check if any parent SX locks
           * are locked before locking Giant. Else the lock can be
           * locked multiple times.
           */
          mtx_lock(&Giant);
          return (1);
  }
  
  #if USB_HAVE_UGEN
  /*
   * This function is the same like usbd_enum_lock() except a value of
   * 255 is returned when a signal is pending:
   */
  uint8_t
  usbd_enum_lock_sig(struct usb_device *udev)
  {
          if (sx_xlocked(&udev->enum_sx))
                  return (0);
          if (sx_xlock_sig(&udev->enum_sx))
                  return (255);
          if (sx_xlock_sig(&udev->sr_sx)) {
                  sx_xunlock(&udev->enum_sx);
                  return (255);
          }
          mtx_lock(&Giant);
          return (1);
  }
  #endif
  
  /* The following function unlocks enumerating the given USB device. */
  
  void
  usbd_enum_unlock(struct usb_device *udev)
  {
          mtx_unlock(&Giant);
          sx_xunlock(&udev->enum_sx);
          sx_xunlock(&udev->sr_sx);
  }
  
  /* The following function locks suspend and resume. */
  
  void
  usbd_sr_lock(struct usb_device *udev)
  {
          sx_xlock(&udev->sr_sx);
          /* 
           * NEWBUS LOCK NOTE: We should check if any parent SX locks
           * are locked before locking Giant. Else the lock can be
           * locked multiple times.
           */
          mtx_lock(&Giant);
  }
  
  /* The following function unlocks suspend and resume. */
  
  void
  usbd_sr_unlock(struct usb_device *udev)
  {
          mtx_unlock(&Giant);
          sx_xunlock(&udev->sr_sx);
  }
  
  /*
   * The following function checks the enumerating lock for the given
   * USB device.
   */
  
  uint8_t
  usbd_enum_is_locked(struct usb_device *udev)
  {
          return (sx_xlocked(&udev->enum_sx));
  }
  
  /*
   * The following function is used to serialize access to USB control
   * transfers and the USB scratch area. If the lock is already grabbed
   * this function returns zero. Else a value of one is returned.
   */
  uint8_t
  usbd_ctrl_lock(struct usb_device *udev)
  {
          if (sx_xlocked(&udev->ctrl_sx))
                  return (0);
          sx_xlock(&udev->ctrl_sx);
  
          /*
           * We need to allow suspend and resume at this point, else the
           * control transfer will timeout if the device is suspended!
           */
          if (usbd_enum_is_locked(udev))
                  usbd_sr_unlock(udev);
          return (1);
  }
  
  void
  usbd_ctrl_unlock(struct usb_device *udev)
  {
          sx_xunlock(&udev->ctrl_sx);
  
          /*
           * Restore the suspend and resume lock after we have unlocked
           * the USB control transfer lock to avoid LOR:
           */
          if (usbd_enum_is_locked(udev))
                  usbd_sr_lock(udev);
  }
  
  /*
   * The following function is used to set the per-interface specific
   * plug and play information. The string referred to by the pnpinfo
   * argument can safely be freed after calling this function. The
   * pnpinfo of an interface will be reset at device detach or when
   * passing a NULL argument to this function. This function
   * returns zero on success, else a USB_ERR_XXX failure code.
   */
  
  usb_error_t 
  usbd_set_pnpinfo(struct usb_device *udev, uint8_t iface_index, const char *pnpinfo)
  {
          struct usb_interface *iface;
  
          iface = usbd_get_iface(udev, iface_index);
          if (iface == NULL)
                  return (USB_ERR_INVAL);
  
          if (iface->pnpinfo != NULL) {
                  free(iface->pnpinfo, M_USBDEV);
                  iface->pnpinfo = NULL;
          }
  
          if (pnpinfo == NULL || pnpinfo[0] == 0)
                  return (0);             /* success */
  
          iface->pnpinfo = strdup(pnpinfo, M_USBDEV);
          if (iface->pnpinfo == NULL)
                  return (USB_ERR_NOMEM);
  
          return (0);                     /* success */
  }
  
  usb_error_t
  usbd_add_dynamic_quirk(struct usb_device *udev, uint16_t quirk)
  {
          uint8_t x;
  
          for (x = 0; x != USB_MAX_AUTO_QUIRK; x++) {
                  if (udev->autoQuirk[x] == 0 ||
                      udev->autoQuirk[x] == quirk) {
                          udev->autoQuirk[x] = quirk;
                          return (0);     /* success */
                  }
          }
          return (USB_ERR_NOMEM);
  }
  
  /*
   * The following function is used to select the endpoint mode. It
   * should not be called outside enumeration context.
   */
  
  usb_error_t
  usbd_set_endpoint_mode(struct usb_device *udev, struct usb_endpoint *ep,
      uint8_t ep_mode)
  {   
          usb_error_t error;
          uint8_t do_unlock;
  
          /* Prevent re-enumeration */
          do_unlock = usbd_enum_lock(udev);
  
          if (udev->bus->methods->set_endpoint_mode != NULL) {
                  error = (udev->bus->methods->set_endpoint_mode) (
                      udev, ep, ep_mode);
          } else if (ep_mode != USB_EP_MODE_DEFAULT) {
                  error = USB_ERR_INVAL;
          } else {
                  error = 0;
          }
  
          /* only set new mode regardless of error */
          ep->ep_mode = ep_mode;
  
          if (do_unlock)
                  usbd_enum_unlock(udev);
          return (error);
  }
  
  uint8_t
  usbd_get_endpoint_mode(struct usb_device *udev, struct usb_endpoint *ep)
  {
          return (ep->ep_mode);
  }

Cache object: d19cab3b97897ec7acd1c5c7fecba689