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 <[email protected]>
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 #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
40 int32_t
hid_get_data(const void * p,const hid_item_t * h)41 hid_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
83 void
hid_set_data(void * p,const hid_item_t * h,int32_t data)84 hid_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
121 int
hid_get_report(int fd,enum hid_kind k,unsigned char * data,unsigned int size)122 hid_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 = data;
128 ugd.ugd_maxlen = size;
129 ugd.ugd_report_type = k + 1;
130 return (ioctl(fd, USB_GET_REPORT, &ugd));
131 }
132
133 int
hid_set_report(int fd,enum hid_kind k,unsigned char * data,unsigned int size)134 hid_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 = data;
140 ugd.ugd_maxlen = size;
141 ugd.ugd_report_type = k + 1;
142 return (ioctl(fd, USB_SET_REPORT, &ugd));
143 }
144