lib/libu4bhid/data.c

   1 /*      $NetBSD: data.c,v 1.8 2000/04/02 11:10:53 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/data.c 225839 2011-09-28 14:52:25Z mav $
  29  */
  30
  31 #include <sys/param.h>
  32 #include <assert.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <bus/u4b/usb_ioctl.h>
  36 #include "usbhid.h"
  37 #include "usbvar.h"
  38
  39 int32_t
  40 hid_get_data(const void *p, const hid_item_t *h)
  41 {
  42         const uint8_t *buf;
  43         uint32_t hpos;
  44         uint32_t hsize;
  45         uint32_t data;
  46         int i, end, offs;
  47
  48         buf = p;
  49
  50         /* Skip report ID byte. */
  51         if (h->report_ID > 0)
  52                 buf++;
  53
  54         hpos = h->pos;                  /* bit position of data */
  55         hsize = h->report_size;         /* bit length of data */
  56
  57         /* Range check and limit */
  58         if (hsize == 0)
  59                 return (0);
  60         if (hsize > 32)
  61                 hsize = 32;
  62
  63         offs = hpos / 8;
  64         end = (hpos + hsize) / 8 - offs;
  65         data = 0;
  66         for (i = 0; i <= end; i++)
  67                 data |= buf[offs + i] << (i*8);
  68
  69         /* Correctly shift down data */
  70         data >>= hpos % 8;
  71         hsize = 32 - hsize;
  72
  73         /* Mask and sign extend in one */
  74         if ((h->logical_minimum < 0) || (h->logical_maximum < 0))
  75                 data = (int32_t)((int32_t)data << hsize) >> hsize;
  76         else
  77                 data = (uint32_t)((uint32_t)data << hsize) >> hsize;
  78
  79         return (data);
  80 }
  81
  82 void
  83 hid_set_data(void *p, const hid_item_t *h, int32_t data)
  84 {
  85         uint8_t *buf;
  86         uint32_t hpos;
  87         uint32_t hsize;
  88         uint32_t mask;
  89         int i;
  90         int end;
  91         int offs;
  92
  93         buf = p;
  94
  95         /* Set report ID byte. */
  96         if (h->report_ID > 0)
  97                 *buf++ = h->report_ID & 0xff;
  98
  99         hpos = h->pos;                  /* bit position of data */
 100         hsize = h->report_size;         /* bit length of data */
 101
 102         if (hsize != 32) {
 103                 mask = (1 << hsize) - 1;
 104                 data &= mask;
 105         } else
 106                 mask = ~0;
 107
 108         data <<= (hpos % 8);
 109         mask <<= (hpos % 8);
 110         mask = ~mask;
 111
 112         offs = hpos / 8;
 113         end = (hpos + hsize) / 8 - offs;
 114
 115         for (i = 0; i <= end; i++)
 116                 buf[offs + i] = (buf[offs + i] & (mask >> (i*8))) |
 117                     ((data >> (i*8)) & 0xff);
 118 }
 119
 120 int
 121 hid_get_report(int fd, enum hid_kind k, unsigned char *data, unsigned int size)
 122 {
 123         struct usb_gen_descriptor ugd;
 124
 125         memset(&ugd, 0, sizeof(ugd));
 126         ugd.ugd_data = hid_pass_ptr(data);
 127         ugd.ugd_maxlen = size;
 128         ugd.ugd_report_type = k + 1;
 129         return (ioctl(fd, USB_GET_REPORT, &ugd));
 130 }
 131
 132 int
 133 hid_set_report(int fd, enum hid_kind k, unsigned char *data, unsigned int size)
 134 {
 135         struct usb_gen_descriptor ugd;
 136
 137         memset(&ugd, 0, sizeof(ugd));
 138         ugd.ugd_data = hid_pass_ptr(data);
 139         ugd.ugd_maxlen = size;
 140         ugd.ugd_report_type = k + 1;
 141         return (ioctl(fd, USB_SET_REPORT, &ugd));
 142 }