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
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/param.h>
33#include <assert.h>
34#include <stdlib.h>
35#include <string.h>
36#include <dev/usb/usb_ioctl.h>
37#include "usbhid.h"
38#include "usbvar.h"
39
40int32_t
41hid_get_data(const void *p, const hid_item_t *h)
42{
43	const uint8_t *buf;
44	uint32_t hpos;
45	uint32_t hsize;
46	uint32_t data;
47	int i, end, offs;
48
49	buf = p;
50
51	/* Skip report ID byte. */
52	if (h->report_ID > 0)
53		buf++;
54
55	hpos = h->pos;			/* bit position of data */
56	hsize = h->report_size;		/* bit length of data */
57
58	/* Range check and limit */
59	if (hsize == 0)
60		return (0);
61	if (hsize > 32)
62		hsize = 32;
63
64	offs = hpos / 8;
65	end = (hpos + hsize) / 8 - offs;
66	data = 0;
67	for (i = 0; i <= end; i++)
68		data |= buf[offs + i] << (i*8);
69
70	/* Correctly shift down data */
71	data >>= hpos % 8;
72	hsize = 32 - hsize;
73
74	/* Mask and sign extend in one */
75	if ((h->logical_minimum < 0) || (h->logical_maximum < 0))
76		data = (int32_t)((int32_t)data << hsize) >> hsize;
77	else
78		data = (uint32_t)((uint32_t)data << hsize) >> hsize;
79
80	return (data);
81}
82
83void
84hid_set_data(void *p, const hid_item_t *h, int32_t data)
85{
86	uint8_t *buf;
87	uint32_t hpos;
88	uint32_t hsize;
89	uint32_t mask;
90	int i;
91	int end;
92	int offs;
93
94	buf = p;
95
96	/* Set report ID byte. */
97	if (h->report_ID > 0)
98		*buf++ = h->report_ID & 0xff;
99
100	hpos = h->pos;			/* bit position of data */
101	hsize = h->report_size;		/* bit length of data */
102
103	if (hsize != 32) {
104		mask = (1 << hsize) - 1;
105		data &= mask;
106	} else
107		mask = ~0;
108
109	data <<= (hpos % 8);
110	mask <<= (hpos % 8);
111	mask = ~mask;
112
113	offs = hpos / 8;
114	end = (hpos + hsize) / 8 - offs;
115
116	for (i = 0; i <= end; i++)
117		buf[offs + i] = (buf[offs + i] & (mask >> (i*8))) |
118		    ((data >> (i*8)) & 0xff);
119}
120
121int
122hid_get_report(int fd, enum hid_kind k, unsigned char *data, unsigned int size)
123{
124	struct usb_gen_descriptor ugd;
125
126	memset(&ugd, 0, sizeof(ugd));
127	ugd.ugd_data = hid_pass_ptr(data);
128	ugd.ugd_maxlen = size;
129	ugd.ugd_report_type = k + 1;
130	return (ioctl(fd, USB_GET_REPORT, &ugd));
131}
132
133int
134hid_set_report(int fd, enum hid_kind k, unsigned char *data, unsigned int size)
135{
136	struct usb_gen_descriptor ugd;
137
138	memset(&ugd, 0, sizeof(ugd));
139	ugd.ugd_data = hid_pass_ptr(data);
140	ugd.ugd_maxlen = size;
141	ugd.ugd_report_type = k + 1;
142	return (ioctl(fd, USB_SET_REPORT, &ugd));
143}
144