1 /* $NetBSD: data.c,v 1.8 2000/04/02 11:10:53 augustss Exp $ */
4 * Copyright (c) 1999 Lennart Augustsson <augustss@netbsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
36 hid_get_data(const void *p, const hid_item_t *h)
38 const unsigned char *buf;
45 hpos = h->pos; /* bit position of data */
46 hsize = h->report_size; /* bit length of data */
51 end = (hpos + hsize) / 8 - offs;
53 for (i = 0; i <= end; i++)
54 data |= buf[offs + i] << (i*8);
56 data &= (1 << hsize) - 1;
57 if (h->logical_minimum < 0) {
58 /* Need to sign extend */
59 hsize = sizeof data * 8 - hsize;
60 data = (data << hsize) >> hsize;
66 hid_set_data(void *p, const hid_item_t *h, int data)
71 int i, end, offs, mask;
74 hpos = h->pos; /* bit position of data */
75 hsize = h->report_size; /* bit length of data */
78 mask = (1 << hsize) - 1;
88 end = (hpos + hsize) / 8 - offs;
90 for (i = 0; i <= end; i++)
91 buf[offs + i] = (buf[offs + i] & (mask >> (i*8))) |
92 ((data >> (i*8)) & 0xff);