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 <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/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 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 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 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 = 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 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 = data; 142 ugd.ugd_maxlen = size; 143 ugd.ugd_report_type = k + 1; 144 return (ioctl(fd, USB_SET_REPORT, &ugd)); 145 } 146