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 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 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 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 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 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 = hid_pass_ptr(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 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 = hid_pass_ptr(data); 140 ugd.ugd_maxlen = size; 141 ugd.ugd_report_type = k + 1; 142 return (ioctl(fd, USB_SET_REPORT, &ugd)); 143 } 144