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

     /* $FreeBSD$ */
     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * 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/limits.h>
    #include <sys/endian.h>
    
    #include <dev/usb/usb.h>
    #include <dev/usb/usbdi.h>
    #endif                  /* USB_GLOBAL_INCLUDE_FILE */
    
    /*------------------------------------------------------------------------*
     *      usbd_lookup_id_by_info
     *
     * This functions takes an array of "struct usb_device_id" and tries
     * to match the entries with the information in "struct usbd_lookup_info".
     *
     * NOTE: The "sizeof_id" parameter must be a multiple of the
     * usb_device_id structure size. Else the behaviour of this function
     * is undefined.
     *
     * Return values:
     * NULL: No match found.
     * Else: Pointer to matching entry.
     *------------------------------------------------------------------------*/
    const struct usb_device_id *
    usbd_lookup_id_by_info(const struct usb_device_id *id, usb_size_t sizeof_id,
        const struct usbd_lookup_info *info)
    {
            const struct usb_device_id *id_end;
    
            if (id == NULL) {
                    goto done;
            }
            id_end = (const void *)(((const uint8_t *)id) + sizeof_id);
    
            /*
             * Keep on matching array entries until we find a match or
             * until we reach the end of the matching array:
             */
            for (; id != id_end; id++) {
                    if ((id->match_flag_vendor) &&
                        (id->idVendor != info->idVendor)) {
                            continue;
                    }
                    if ((id->match_flag_product) &&
                        (id->idProduct != info->idProduct)) {
                            continue;
                    }
                    if ((id->match_flag_dev_lo) &&
                        (id->bcdDevice_lo > info->bcdDevice)) {
                            continue;
                    }
                    if ((id->match_flag_dev_hi) &&
                       (id->bcdDevice_hi < info->bcdDevice)) {
                           continue;
                   }
                   if ((id->match_flag_dev_class) &&
                       (id->bDeviceClass != info->bDeviceClass)) {
                           continue;
                   }
                   if ((id->match_flag_dev_subclass) &&
                       (id->bDeviceSubClass != info->bDeviceSubClass)) {
                           continue;
                   }
                   if ((id->match_flag_dev_protocol) &&
                       (id->bDeviceProtocol != info->bDeviceProtocol)) {
                           continue;
                   }
                   if ((id->match_flag_int_class) &&
                       (id->bInterfaceClass != info->bInterfaceClass)) {
                           continue;
                   }
                   if ((id->match_flag_int_subclass) &&
                       (id->bInterfaceSubClass != info->bInterfaceSubClass)) {
                           continue;
                   }
                   if ((id->match_flag_int_protocol) &&
                       (id->bInterfaceProtocol != info->bInterfaceProtocol)) {
                           continue;
                   }
                   /* We found a match! */
                   return (id);
           }
   
   done:
           return (NULL);
   }
   
   /*------------------------------------------------------------------------*
    *      usbd_lookup_id_by_uaa - factored out code
    *
    * Return values:
    *    0: Success
    * Else: Failure
    *------------------------------------------------------------------------*/
   int
   usbd_lookup_id_by_uaa(const struct usb_device_id *id, usb_size_t sizeof_id,
       struct usb_attach_arg *uaa)
   {
           id = usbd_lookup_id_by_info(id, sizeof_id, &uaa->info);
           if (id) {
                   /* copy driver info */
                   uaa->driver_info = id->driver_info;
                   return (0);
           }
           return (ENXIO);
   }

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