descr.c revision 187994 
1/*	$NetBSD: descr.c,v 1.9 2000/09/24 02:13:24 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: head/lib/libusbhid/descr.c 187994 2009-02-02 00:49:39Z alfred $");
31
32#include <sys/types.h>
33
34#include <assert.h>
35#include <errno.h>
36#include <stdlib.h>
37#include <string.h>
38#include <unistd.h>
39#include <sys/time.h>
40#include <sys/ioctl.h>
41
42#include <dev/usb2/include/usb2_ioctl.h>
43
44#include "usbhid.h"
45#include "usbvar.h"
46
47int
48hid_set_immed(int fd, int enable)
49{
50	int ret;
51	ret = ioctl(fd, USB_SET_IMMED, &enable);
52	if (ret < 0)
53		ret = hid_set_immed_compat7(fd, enable);
54	return (ret);
55}
56
57int
58hid_get_report_id(int fd)
59{
60	int temp = -1;
61	int ret;
62
63	ret = ioctl(fd, USB_GET_REPORT_ID, &temp);
64	if (ret < 0)
65		ret = hid_get_report_id_compat7(fd);
66	else
67		ret = temp;
68
69	return (ret);
70}
71
72report_desc_t
73hid_get_report_desc(int fd)
74{
75	struct usb2_gen_descriptor ugd;
76	report_desc_t rep;
77	void *data;
78
79	memset(&ugd, 0, sizeof(ugd));
80
81	/* get actual length first */
82	ugd.ugd_data = NULL;
83	ugd.ugd_maxlen = 65535;
84	if (ioctl(fd, USB_GET_REPORT_DESC, &ugd) < 0) {
85		/* could not read descriptor */
86		/* try FreeBSD 7 compat code */
87		return (hid_get_report_desc_compat7(fd));
88	}
89
90	/*
91	 * NOTE: The kernel will return a failure if
92	 * "ugd_actlen" is zero.
93	 */
94	data = malloc(ugd.ugd_actlen);
95	if (data == NULL)
96		return (NULL);
97
98	/* fetch actual descriptor */
99	ugd.ugd_data = data;
100	ugd.ugd_maxlen = ugd.ugd_actlen;
101	if (ioctl(fd, USB_GET_REPORT_DESC, &ugd) < 0) {
102		/* could not read descriptor */
103		free(data);
104		return (NULL);
105	}
106
107	/* check END_COLLECTION */
108	if (((unsigned char *)ugd.ugd_data)[ugd.ugd_actlen -1] != 0xC0) {
109		/* invalid end byte */
110		free(data);
111		return (NULL);
112	}
113
114	rep = hid_use_report_desc(data, ugd.ugd_actlen);
115
116	free(data);
117
118	return (rep);
119}
120
121report_desc_t
122hid_use_report_desc(unsigned char *data, unsigned int size)
123{
124	report_desc_t r;
125
126	r = malloc(sizeof(*r) + size);
127	if (r == 0) {
128		errno = ENOMEM;
129		return (NULL);
130	}
131	r->size = size;
132	memcpy(r->data, data, size);
133	return (r);
134}
135
136void
137hid_dispose_report_desc(report_desc_t r)
138{
139
140	free(r);
141}
142