lib/libu4bhid/descr.c

   1 /*      $NetBSD: descr.c,v 1.9 2000/09/24 02:13:24 augustss Exp $       */
   2
   3 /*
   4  * Copyright (c) 1999 Lennart Augustsson <augustss@netbsd.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: head/lib/libusbhid/descr.c 240762 2012-09-20 18:56:27Z mav $
  29  */
  30
  31 #include <sys/types.h>
  32
  33 #include <assert.h>
  34 #include <errno.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38 #include <sys/time.h>
  39 #include <sys/ioctl.h>
  40 #include <bus/u4b/usb_ioctl.h>
  41
  42 #include "usbhid.h"
  43 #include "usbvar.h"
  44
  45 int
  46 hid_set_immed(int fd, int enable)
  47 {
  48         int ret;
  49         ret = ioctl(fd, USB_SET_IMMED, &enable);
  50 #ifdef HID_COMPAT7
  51         if (ret < 0)
  52                 ret = hid_set_immed_compat7(fd, enable);
  53 #endif
  54         return (ret);
  55 }
  56
  57 int
  58 hid_get_report_id(int fd)
  59 {
  60         report_desc_t rep;
  61         hid_data_t d;
  62         hid_item_t h;
  63         int kindset;
  64         int temp = -1;
  65         int ret;
  66
  67         if ((rep = hid_get_report_desc(fd)) == NULL)
  68                 goto use_ioctl;
  69         kindset = 1 << hid_input | 1 << hid_output | 1 << hid_feature;
  70         for (d = hid_start_parse(rep, kindset, -1); hid_get_item(d, &h); ) {
  71                 /* Return the first report ID we met. */
  72                 if (h.report_ID != 0) {
  73                         temp = h.report_ID;
  74                         break;
  75                 }
  76         }
  77         hid_end_parse(d);
  78         hid_dispose_report_desc(rep);
  79
  80         if (temp > 0)
  81                 return (temp);
  82
  83 use_ioctl:
  84         ret = ioctl(fd, USB_GET_REPORT_ID, &temp);
  85 #ifdef HID_COMPAT7
  86         if (ret < 0)
  87                 ret = hid_get_report_id_compat7(fd);
  88         else
  89 #endif
  90                 ret = temp;
  91
  92         return (ret);
  93 }
  94
  95 report_desc_t
  96 hid_get_report_desc(int fd)
  97 {
  98         struct usb_gen_descriptor ugd;
  99         report_desc_t rep;
 100         void *data;
 101
 102         memset(&ugd, 0, sizeof(ugd));
 103
 104         /* get actual length first */
 105         ugd.ugd_data = hid_pass_ptr(NULL);
 106         ugd.ugd_maxlen = 65535;
 107         if (ioctl(fd, USB_GET_REPORT_DESC, &ugd) < 0) {
 108 #ifdef HID_COMPAT7
 109                 /* could not read descriptor */
 110                 /* try FreeBSD 7 compat code */
 111                 return (hid_get_report_desc_compat7(fd));
 112 #else
 113                 return (NULL);
 114 #endif
 115         }
 116
 117         /*
 118          * NOTE: The kernel will return a failure if
 119          * "ugd_actlen" is zero.
 120          */
 121         data = malloc(ugd.ugd_actlen);
 122         if (data == NULL)
 123                 return (NULL);
 124
 125         /* fetch actual descriptor */
 126         ugd.ugd_data = hid_pass_ptr(data);
 127         ugd.ugd_maxlen = ugd.ugd_actlen;
 128         if (ioctl(fd, USB_GET_REPORT_DESC, &ugd) < 0) {
 129                 /* could not read descriptor */
 130                 free(data);
 131                 return (NULL);
 132         }
 133
 134         /* sanity check */
 135         if (ugd.ugd_actlen < 1) {
 136                 /* invalid report descriptor */
 137                 free(data);
 138                 return (NULL);
 139         }
 140
 141         /* check END_COLLECTION */
 142         if (((unsigned char *)data)[ugd.ugd_actlen -1] != 0xC0) {
 143                 /* invalid end byte */
 144                 free(data);
 145                 return (NULL);
 146         }
 147
 148         rep = hid_use_report_desc(data, ugd.ugd_actlen);
 149
 150         free(data);
 151
 152         return (rep);
 153 }
 154
 155 report_desc_t
 156 hid_use_report_desc(unsigned char *data, unsigned int size)
 157 {
 158         report_desc_t r;
 159
 160         r = malloc(sizeof(*r) + size);
 161         if (r == 0) {
 162                 errno = ENOMEM;
 163                 return (NULL);
 164         }
 165         r->size = size;
 166         memcpy(r->data, data, size);
 167         return (r);
 168 }
 169
 170 void
 171 hid_dispose_report_desc(report_desc_t r)
 172 {
 173
 174         free(r);
 175 }