1/*	$NetBSD: data.c,v 1.8 2000/04/02 11:10:53 augustss Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 * Copyright (c) 1999 Lennart Augustsson <augustss@netbsd.org>
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/param.h>
32#include <assert.h>
33#include <stdlib.h>
34#include <string.h>
35#include <dev/usb/usb_ioctl.h>
36#include "usbhid.h"
37#include "usbvar.h"
38
39int32_t
40hid_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
82void
83hid_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
120int
121hid_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 = data;
127	ugd.ugd_maxlen = size;
128	ugd.ugd_report_type = k + 1;
129	return (ioctl(fd, USB_GET_REPORT, &ugd));
130}
131
132int
133hid_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 = data;
139	ugd.ugd_maxlen = size;
140	ugd.ugd_report_type = k + 1;
141	return (ioctl(fd, USB_SET_REPORT, &ugd));
142}
143