1 /* $NetBSD: data.c,v 1.8 2000/04/02 11:10:53 augustss Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
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 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <assert.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <dev/usb/usb_ioctl.h>
39 #include "usbhid.h"
40 #include "usbvar.h"
41
42 int32_t
hid_get_data(const void * p,const hid_item_t * h)43 hid_get_data(const void *p, const hid_item_t *h)
44 {
45 const uint8_t *buf;
46 uint32_t hpos;
47 uint32_t hsize;
48 uint32_t data;
49 int i, end, offs;
50
51 buf = p;
52
53 /* Skip report ID byte. */
54 if (h->report_ID > 0)
55 buf++;
56
57 hpos = h->pos; /* bit position of data */
58 hsize = h->report_size; /* bit length of data */
59
60 /* Range check and limit */
61 if (hsize == 0)
62 return (0);
63 if (hsize > 32)
64 hsize = 32;
65
66 offs = hpos / 8;
67 end = (hpos + hsize) / 8 - offs;
68 data = 0;
69 for (i = 0; i <= end; i++)
70 data |= buf[offs + i] << (i*8);
71
72 /* Correctly shift down data */
73 data >>= hpos % 8;
74 hsize = 32 - hsize;
75
76 /* Mask and sign extend in one */
77 if ((h->logical_minimum < 0) || (h->logical_maximum < 0))
78 data = (int32_t)((int32_t)data << hsize) >> hsize;
79 else
80 data = (uint32_t)((uint32_t)data << hsize) >> hsize;
81
82 return (data);
83 }
84
85 void
hid_set_data(void * p,const hid_item_t * h,int32_t data)86 hid_set_data(void *p, const hid_item_t *h, int32_t data)
87 {
88 uint8_t *buf;
89 uint32_t hpos;
90 uint32_t hsize;
91 uint32_t mask;
92 int i;
93 int end;
94 int offs;
95
96 buf = p;
97
98 /* Set report ID byte. */
99 if (h->report_ID > 0)
100 *buf++ = h->report_ID & 0xff;
101
102 hpos = h->pos; /* bit position of data */
103 hsize = h->report_size; /* bit length of data */
104
105 if (hsize != 32) {
106 mask = (1 << hsize) - 1;
107 data &= mask;
108 } else
109 mask = ~0;
110
111 data <<= (hpos % 8);
112 mask <<= (hpos % 8);
113 mask = ~mask;
114
115 offs = hpos / 8;
116 end = (hpos + hsize) / 8 - offs;
117
118 for (i = 0; i <= end; i++)
119 buf[offs + i] = (buf[offs + i] & (mask >> (i*8))) |
120 ((data >> (i*8)) & 0xff);
121 }
122
123 int
hid_get_report(int fd,enum hid_kind k,unsigned char * data,unsigned int size)124 hid_get_report(int fd, enum hid_kind k, unsigned char *data, unsigned int size)
125 {
126 struct usb_gen_descriptor ugd;
127
128 memset(&ugd, 0, sizeof(ugd));
129 ugd.ugd_data = hid_pass_ptr(data);
130 ugd.ugd_maxlen = size;
131 ugd.ugd_report_type = k + 1;
132 return (ioctl(fd, USB_GET_REPORT, &ugd));
133 }
134
135 int
hid_set_report(int fd,enum hid_kind k,unsigned char * data,unsigned int size)136 hid_set_report(int fd, enum hid_kind k, unsigned char *data, unsigned int size)
137 {
138 struct usb_gen_descriptor ugd;
139
140 memset(&ugd, 0, sizeof(ugd));
141 ugd.ugd_data = hid_pass_ptr(data);
142 ugd.ugd_maxlen = size;
143 ugd.ugd_report_type = k + 1;
144 return (ioctl(fd, USB_SET_REPORT, &ugd));
145 }
146