1/*	$NetBSD: data.c,v 1.8 2000/04/02 11:10:53 augustss Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
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/cdefs.h>
32__FBSDID("$FreeBSD$");
33
34#include <sys/param.h>
35#include <assert.h>
36#include <stdlib.h>
37#include <string.h>
38#include <dev/usb/usb_ioctl.h>
39#include "usbhid.h"
40#include "usbvar.h"
41
42int32_t
43hid_get_data(const void *p, const hid_item_t *h)
44{
45	const uint8_t *buf;
46	uint32_t hpos;
47	uint32_t hsize;
48	uint32_t data;
49	int i, end, offs;
50
51	buf = p;
52
53	/* Skip report ID byte. */
54	if (h->report_ID > 0)
55		buf++;
56
57	hpos = h->pos;			/* bit position of data */
58	hsize = h->report_size;		/* bit length of data */
59
60	/* Range check and limit */
61	if (hsize == 0)
62		return (0);
63	if (hsize > 32)
64		hsize = 32;
65
66	offs = hpos / 8;
67	end = (hpos + hsize) / 8 - offs;
68	data = 0;
69	for (i = 0; i <= end; i++)
70		data |= buf[offs + i] << (i*8);
71
72	/* Correctly shift down data */
73	data >>= hpos % 8;
74	hsize = 32 - hsize;
75
76	/* Mask and sign extend in one */
77	if ((h->logical_minimum < 0) || (h->logical_maximum < 0))
78		data = (int32_t)((int32_t)data << hsize) >> hsize;
79	else
80		data = (uint32_t)((uint32_t)data << hsize) >> hsize;
81
82	return (data);
83}
84
85void
86hid_set_data(void *p, const hid_item_t *h, int32_t data)
87{
88	uint8_t *buf;
89	uint32_t hpos;
90	uint32_t hsize;
91	uint32_t mask;
92	int i;
93	int end;
94	int offs;
95
96	buf = p;
97
98	/* Set report ID byte. */
99	if (h->report_ID > 0)
100		*buf++ = h->report_ID & 0xff;
101
102	hpos = h->pos;			/* bit position of data */
103	hsize = h->report_size;		/* bit length of data */
104
105	if (hsize != 32) {
106		mask = (1 << hsize) - 1;
107		data &= mask;
108	} else
109		mask = ~0;
110
111	data <<= (hpos % 8);
112	mask <<= (hpos % 8);
113	mask = ~mask;
114
115	offs = hpos / 8;
116	end = (hpos + hsize) / 8 - offs;
117
118	for (i = 0; i <= end; i++)
119		buf[offs + i] = (buf[offs + i] & (mask >> (i*8))) |
120		    ((data >> (i*8)) & 0xff);
121}
122
123int
124hid_get_report(int fd, enum hid_kind k, unsigned char *data, unsigned int size)
125{
126	struct usb_gen_descriptor ugd;
127
128	memset(&ugd, 0, sizeof(ugd));
129	ugd.ugd_data = hid_pass_ptr(data);
130	ugd.ugd_maxlen = size;
131	ugd.ugd_report_type = k + 1;
132	return (ioctl(fd, USB_GET_REPORT, &ugd));
133}
134
135int
136hid_set_report(int fd, enum hid_kind k, unsigned char *data, unsigned int size)
137{
138	struct usb_gen_descriptor ugd;
139
140	memset(&ugd, 0, sizeof(ugd));
141	ugd.ugd_data = hid_pass_ptr(data);
142	ugd.ugd_maxlen = size;
143	ugd.ugd_report_type = k + 1;
144	return (ioctl(fd, USB_SET_REPORT, &ugd));
145}
146