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
39 int32_t
hid_get_data(const void * p,const hid_item_t * h)40 hid_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
82 void
hid_set_data(void * p,const hid_item_t * h,int32_t data)83 hid_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
120 int
hid_get_report(int fd,enum hid_kind k,unsigned char * data,unsigned int size)121 hid_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
132 int
hid_set_report(int fd,enum hid_kind k,unsigned char * data,unsigned int size)133 hid_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