1 /* $NetBSD: data.c,v 1.8 2000/04/02 11:10:53 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 * $FreeBSD: head/lib/libusbhid/data.c 225839 2011-09-28 14:52:25Z mav $ 29 */ 30 31 #include <sys/param.h> 32 #include <assert.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <bus/u4b/usb_ioctl.h> 36 #include "usbhid.h" 37 #include "usbvar.h" 38 39 int32_t 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 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 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 = hid_pass_ptr(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 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 = hid_pass_ptr(data); 139 ugd.ugd_maxlen = size; 140 ugd.ugd_report_type = k + 1; 141 return (ioctl(fd, USB_SET_REPORT, &ugd)); 142 } 143