hid.c revision 1.1
1 /* $NetBSD: hid.c,v 1.1 2017/12/10 17:03:07 bouyer Exp $ */ 2 /* $FreeBSD: src/sys/dev/usb/hid.c,v 1.11 1999/11/17 22:33:39 n_hibma Exp $ */ 3 4 /* 5 * Copyright (c) 1998 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Lennart Augustsson (lennart (at) augustsson.net) at 10 * Carlstedt Research & Technology. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: hid.c,v 1.1 2017/12/10 17:03:07 bouyer Exp $"); 36 37 #ifdef _KERNEL_OPT 38 #include "opt_usb.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/kmem.h> 45 46 #include <dev/usb/usb.h> 47 #include <dev/usb/usbhid.h> 48 49 #include <dev/hid/hid.h> 50 51 #ifdef UHIDEV_DEBUG 52 #define DPRINTF(x) if (uhidevdebug) printf x 53 #define DPRINTFN(n,x) if (uhidevdebug>(n)) printf x 54 extern int uhidevdebug; 55 #else 56 #define DPRINTF(x) 57 #define DPRINTFN(n,x) 58 #endif 59 60 Static void hid_clear_local(struct hid_item *); 61 62 #define MAXUSAGE 256 63 struct hid_data { 64 const u_char *start; 65 const u_char *end; 66 const u_char *p; 67 struct hid_item cur; 68 int32_t usages[MAXUSAGE]; 69 int nu; 70 int minset; 71 int multi; 72 int multimax; 73 enum hid_kind kind; 74 }; 75 76 Static void 77 hid_clear_local(struct hid_item *c) 78 { 79 80 DPRINTFN(5,("hid_clear_local\n")); 81 c->usage = 0; 82 c->usage_minimum = 0; 83 c->usage_maximum = 0; 84 c->designator_index = 0; 85 c->designator_minimum = 0; 86 c->designator_maximum = 0; 87 c->string_index = 0; 88 c->string_minimum = 0; 89 c->string_maximum = 0; 90 c->set_delimiter = 0; 91 } 92 93 struct hid_data * 94 hid_start_parse(const void *d, int len, enum hid_kind kind) 95 { 96 struct hid_data *s; 97 98 s = kmem_zalloc(sizeof(*s), KM_SLEEP); 99 s->start = s->p = d; 100 s->end = (const char *)d + len; 101 s->kind = kind; 102 return s; 103 } 104 105 void 106 hid_end_parse(struct hid_data *s) 107 { 108 109 while (s->cur.next != NULL) { 110 struct hid_item *hi = s->cur.next->next; 111 kmem_free(s->cur.next, sizeof(*s->cur.next)); 112 s->cur.next = hi; 113 } 114 kmem_free(s, sizeof(*s)); 115 } 116 117 int 118 hid_get_item(struct hid_data *s, struct hid_item *h) 119 { 120 struct hid_item *c = &s->cur; 121 unsigned int bTag, bType, bSize; 122 uint32_t oldpos; 123 const u_char *data; 124 int32_t dval; 125 const u_char *p; 126 struct hid_item *hi; 127 int i; 128 enum hid_kind retkind; 129 130 top: 131 DPRINTFN(5,("hid_get_item: multi=%d multimax=%d\n", 132 s->multi, s->multimax)); 133 if (s->multimax != 0) { 134 if (s->multi < s->multimax) { 135 c->usage = s->usages[min(s->multi, s->nu-1)]; 136 s->multi++; 137 *h = *c; 138 c->loc.pos += c->loc.size; 139 h->next = NULL; 140 DPRINTFN(5,("return multi\n")); 141 return 1; 142 } else { 143 c->loc.count = s->multimax; 144 s->multimax = 0; 145 s->nu = 0; 146 hid_clear_local(c); 147 } 148 } 149 for (;;) { 150 p = s->p; 151 if (p >= s->end) 152 return 0; 153 154 bSize = *p++; 155 if (bSize == 0xfe) { 156 /* long item */ 157 bSize = *p++; 158 bSize |= *p++ << 8; 159 bTag = *p++; 160 data = p; 161 p += bSize; 162 bType = 0xff; /* XXX what should it be */ 163 } else { 164 /* short item */ 165 bTag = bSize >> 4; 166 bType = (bSize >> 2) & 3; 167 bSize &= 3; 168 if (bSize == 3) bSize = 4; 169 data = p; 170 p += bSize; 171 } 172 s->p = p; 173 switch(bSize) { 174 case 0: 175 dval = 0; 176 break; 177 case 1: 178 dval = (int8_t)*data++; 179 break; 180 case 2: 181 dval = *data++; 182 dval |= *data++ << 8; 183 dval = (int16_t)dval; 184 break; 185 case 4: 186 dval = *data++; 187 dval |= *data++ << 8; 188 dval |= *data++ << 16; 189 dval |= *data++ << 24; 190 dval = (int32_t)dval; 191 break; 192 default: 193 aprint_normal("BAD LENGTH %d\n", bSize); 194 continue; 195 } 196 197 DPRINTFN(5,("hid_get_item: bType=%d bTag=%d dval=%d\n", 198 bType, bTag, dval)); 199 switch (bType) { 200 case 0: /* Main */ 201 switch (bTag) { 202 case 8: /* Input */ 203 retkind = hid_input; 204 ret: 205 if (s->kind != retkind) { 206 s->minset = 0; 207 s->nu = 0; 208 hid_clear_local(c); 209 continue; 210 } 211 c->kind = retkind; 212 c->flags = dval; 213 if (c->flags & HIO_VARIABLE) { 214 s->multimax = c->loc.count; 215 s->multi = 0; 216 c->loc.count = 1; 217 if (s->minset) { 218 for (i = c->usage_minimum; 219 i <= c->usage_maximum; 220 i++) { 221 s->usages[s->nu] = i; 222 if (s->nu < MAXUSAGE-1) 223 s->nu++; 224 } 225 s->minset = 0; 226 } 227 goto top; 228 } else { 229 if (s->minset) 230 c->usage = c->usage_minimum; 231 *h = *c; 232 h->next = NULL; 233 c->loc.pos += 234 c->loc.size * c->loc.count; 235 s->minset = 0; 236 s->nu = 0; 237 hid_clear_local(c); 238 return 1; 239 } 240 case 9: /* Output */ 241 retkind = hid_output; 242 goto ret; 243 case 10: /* Collection */ 244 c->kind = hid_collection; 245 c->collection = dval; 246 c->collevel++; 247 *h = *c; 248 hid_clear_local(c); 249 s->nu = 0; 250 return 1; 251 case 11: /* Feature */ 252 retkind = hid_feature; 253 goto ret; 254 case 12: /* End collection */ 255 c->kind = hid_endcollection; 256 c->collevel--; 257 *h = *c; 258 s->nu = 0; 259 return 1; 260 default: 261 aprint_normal("Main bTag=%d\n", bTag); 262 break; 263 } 264 break; 265 case 1: /* Global */ 266 switch (bTag) { 267 case 0: 268 c->_usage_page = dval << 16; 269 break; 270 case 1: 271 c->logical_minimum = dval; 272 break; 273 case 2: 274 c->logical_maximum = dval; 275 break; 276 case 3: 277 c->physical_minimum = dval; 278 break; 279 case 4: 280 c->physical_maximum = dval; 281 break; 282 case 5: 283 c->unit_exponent = dval; 284 break; 285 case 6: 286 c->unit = dval; 287 break; 288 case 7: 289 c->loc.size = dval; 290 break; 291 case 8: 292 c->report_ID = dval; 293 c->loc.pos = 0; 294 break; 295 case 9: 296 c->loc.count = dval; 297 break; 298 case 10: /* Push */ 299 hi = kmem_alloc(sizeof(*hi), KM_SLEEP); 300 *hi = *c; 301 c->next = hi; 302 break; 303 case 11: /* Pop */ 304 hi = c->next; 305 if (hi == NULL) 306 break; 307 oldpos = c->loc.pos; 308 *c = *hi; 309 c->loc.pos = oldpos; 310 kmem_free(hi, sizeof(*hi)); 311 break; 312 default: 313 aprint_normal("Global bTag=%d\n", bTag); 314 break; 315 } 316 break; 317 case 2: /* Local */ 318 switch (bTag) { 319 case 0: 320 if (bSize == 1) 321 dval = c->_usage_page | (dval&0xff); 322 else if (bSize == 2) 323 dval = c->_usage_page | (dval&0xffff); 324 c->usage = dval; 325 if (s->nu < MAXUSAGE) 326 s->usages[s->nu++] = dval; 327 /* else XXX */ 328 break; 329 case 1: 330 s->minset = 1; 331 if (bSize == 1) 332 dval = c->_usage_page | (dval&0xff); 333 else if (bSize == 2) 334 dval = c->_usage_page | (dval&0xffff); 335 c->usage_minimum = dval; 336 break; 337 case 2: 338 if (bSize == 1) 339 dval = c->_usage_page | (dval&0xff); 340 else if (bSize == 2) 341 dval = c->_usage_page | (dval&0xffff); 342 c->usage_maximum = dval; 343 break; 344 case 3: 345 c->designator_index = dval; 346 break; 347 case 4: 348 c->designator_minimum = dval; 349 break; 350 case 5: 351 c->designator_maximum = dval; 352 break; 353 case 7: 354 c->string_index = dval; 355 break; 356 case 8: 357 c->string_minimum = dval; 358 break; 359 case 9: 360 c->string_maximum = dval; 361 break; 362 case 10: 363 c->set_delimiter = dval; 364 break; 365 default: 366 aprint_normal("Local bTag=%d\n", bTag); 367 break; 368 } 369 break; 370 default: 371 aprint_normal("default bType=%d\n", bType); 372 break; 373 } 374 } 375 } 376 377 int 378 hid_report_size(const void *buf, int len, enum hid_kind k, uint8_t id) 379 { 380 struct hid_data *d; 381 struct hid_item h; 382 int lo, hi; 383 384 h.report_ID = 0; 385 lo = hi = -1; 386 DPRINTFN(2,("hid_report_size: kind=%d id=%d\n", k, id)); 387 for (d = hid_start_parse(buf, len, k); hid_get_item(d, &h); ) { 388 DPRINTFN(2,("hid_report_size: item kind=%d id=%d pos=%d " 389 "size=%d count=%d\n", 390 h.kind, h.report_ID, h.loc.pos, h.loc.size, 391 h.loc.count)); 392 if (h.report_ID == id && h.kind == k) { 393 if (lo < 0) { 394 lo = h.loc.pos; 395 #ifdef DIAGNOSTIC 396 if (lo != 0) { 397 aprint_normal("hid_report_size:" 398 " lo != 0\n"); 399 } 400 #endif 401 } 402 hi = h.loc.pos + h.loc.size * h.loc.count; 403 DPRINTFN(2,("hid_report_size: lo=%d hi=%d\n", lo, hi)); 404 } 405 } 406 hid_end_parse(d); 407 return (hi - lo + 7) / 8; 408 } 409 410 int 411 hid_locate(const void *desc, int size, uint32_t u, uint8_t id, enum hid_kind k, 412 struct hid_location *loc, uint32_t *flags) 413 { 414 struct hid_data *d; 415 struct hid_item h; 416 417 h.report_ID = 0; 418 DPRINTFN(5,("hid_locate: enter usage=0x%x kind=%d id=%d\n", u, k, id)); 419 for (d = hid_start_parse(desc, size, k); hid_get_item(d, &h); ) { 420 DPRINTFN(5,("hid_locate: usage=0x%x kind=%d id=%d flags=0x%x\n", 421 h.usage, h.kind, h.report_ID, h.flags)); 422 if (h.kind == k && !(h.flags & HIO_CONST) && 423 h.usage == u && h.report_ID == id) { 424 if (loc != NULL) 425 *loc = h.loc; 426 if (flags != NULL) 427 *flags = h.flags; 428 hid_end_parse(d); 429 return 1; 430 } 431 } 432 hid_end_parse(d); 433 if (loc != NULL) 434 loc->size = 0; 435 return 0; 436 } 437 438 long 439 hid_get_data(const u_char *buf, const struct hid_location *loc) 440 { 441 u_int hsize = loc->size; 442 u_long data; 443 444 if (hsize == 0) 445 return 0; 446 447 data = hid_get_udata(buf, loc); 448 if (data < (1UL << (hsize - 1)) || hsize == sizeof(data) * NBBY) 449 return data; 450 return data - (1UL << hsize); 451 } 452 453 u_long 454 hid_get_udata(const u_char *buf, const struct hid_location *loc) 455 { 456 u_int hpos = loc->pos; 457 u_int hsize = loc->size; 458 u_int i, num, off; 459 u_long data; 460 461 if (hsize == 0) 462 return 0; 463 464 data = 0; 465 off = hpos / 8; 466 num = (hpos + hsize + 7) / 8 - off; 467 468 for (i = 0; i < num; i++) 469 data |= (unsigned long)buf[off + i] << (i * 8); 470 471 data >>= hpos % 8; 472 if (hsize < sizeof(data) * NBBY) 473 data &= (1UL << hsize) - 1; 474 475 DPRINTFN(10,("hid_get_udata: loc %d/%d = %lu\n", hpos, hsize, data)); 476 return data; 477 } 478 479 /* 480 * hid_is_collection(desc, size, id, usage) 481 * 482 * This function is broken in the following way. 483 * 484 * It is used to discover if the given 'id' is part of 'usage' collection 485 * in the descriptor in order to match report id against device type. 486 * 487 * The semantics of hid_start_parse() means though, that only a single 488 * kind of report is considered. The current HID code that uses this for 489 * matching is actually only looking for input reports, so this works 490 * for now. 491 * 492 * This function could try all report kinds (input, output and feature) 493 * consecutively if necessary, but it may be better to integrate the 494 * libusbhid code which can consider multiple report kinds simultaneously 495 * 496 * Needs some thought. 497 */ 498 int 499 hid_is_collection(const void *desc, int size, uint8_t id, uint32_t usage) 500 { 501 struct hid_data *hd; 502 struct hid_item hi; 503 uint32_t coll_usage = ~0; 504 505 hd = hid_start_parse(desc, size, hid_input); 506 if (hd == NULL) 507 return 0; 508 509 DPRINTFN(2,("hid_is_collection: id=%d usage=0x%x\n", id, usage)); 510 while (hid_get_item(hd, &hi)) { 511 DPRINTFN(2,("hid_is_collection: kind=%d id=%d usage=0x%x" 512 "(0x%x)\n", 513 hi.kind, hi.report_ID, hi.usage, coll_usage)); 514 515 if (hi.kind == hid_collection && 516 hi.collection == HCOLL_APPLICATION) 517 coll_usage = hi.usage; 518 519 if (hi.kind == hid_endcollection) 520 coll_usage = ~0; 521 522 if (hi.kind == hid_input && 523 coll_usage == usage && 524 hi.report_ID == id) { 525 DPRINTFN(2,("hid_is_collection: found\n")); 526 hid_end_parse(hd); 527 return 1; 528 } 529 } 530 DPRINTFN(2,("hid_is_collection: not found\n")); 531 hid_end_parse(hd); 532 return 0; 533 } 534
Indexes created Tue Oct 21 19:09:51 GMT 2025