summaryrefslogtreecommitdiffstats
path: root/lib/libusbhid/descr.c
blob: 2ce1bf01b476b658e55c4526ae3a03b6b93b1487 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/*	$NetBSD: descr.c,v 1.9 2000/09/24 02:13:24 augustss Exp $	*/

/*
 * Copyright (c) 1999 Lennart Augustsson <augustss@netbsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/types.h>

#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/ioctl.h>

#include <dev/usb/usb_ioctl.h>

#include "usbhid.h"
#include "usbvar.h"

int
hid_set_immed(int fd, int enable)
{
	int ret;
	ret = ioctl(fd, USB_SET_IMMED, &enable);
#ifdef HID_COMPAT7
	if (ret < 0)
		ret = hid_set_immed_compat7(fd, enable);
#endif
	return (ret);
}

int
hid_get_report_id(int fd)
{
	int temp = -1;
	int ret;

	ret = ioctl(fd, USB_GET_REPORT_ID, &temp);
#ifdef HID_COMPAT7
	if (ret < 0)
		ret = hid_get_report_id_compat7(fd);
	else
#endif
		ret = temp;

	return (ret);
}

report_desc_t
hid_get_report_desc(int fd)
{
	struct usb_gen_descriptor ugd;
	report_desc_t rep;
	void *data;

	memset(&ugd, 0, sizeof(ugd));

	/* get actual length first */
	ugd.ugd_data = NULL;
	ugd.ugd_maxlen = 65535;
	if (ioctl(fd, USB_GET_REPORT_DESC, &ugd) < 0) {
#ifdef HID_COMPAT7
		/* could not read descriptor */
		/* try FreeBSD 7 compat code */
		return (hid_get_report_desc_compat7(fd));
#else
		return (NULL);
#endif
	}

	/*
	 * NOTE: The kernel will return a failure if 
	 * "ugd_actlen" is zero.
	 */
	data = malloc(ugd.ugd_actlen);
	if (data == NULL)
		return (NULL);

	/* fetch actual descriptor */
	ugd.ugd_data = data;
	ugd.ugd_maxlen = ugd.ugd_actlen;
	if (ioctl(fd, USB_GET_REPORT_DESC, &ugd) < 0) {
		/* could not read descriptor */
		free(data);
		return (NULL);
	}

	/* check END_COLLECTION */
	if (((unsigned char *)ugd.ugd_data)[ugd.ugd_actlen -1] != 0xC0) {
		/* invalid end byte */
		free(data);
		return (NULL);
	}

	rep = hid_use_report_desc(data, ugd.ugd_actlen);

	free(data);

	return (rep);
}

report_desc_t
hid_use_report_desc(unsigned char *data, unsigned int size)
{
	report_desc_t r;

	r = malloc(sizeof(*r) + size);
	if (r == 0) {
		errno = ENOMEM;
		return (NULL);
	}
	r->size = size;
	memcpy(r->data, data, size);
	return (r);
}

void
hid_dispose_report_desc(report_desc_t r)
{

	free(r);
}
OpenPOWER on IntegriCloud