sys/dev/usb/usb_hid.c

   1 /*      $NetBSD: hid.c,v 1.17 2001/11/13 06:24:53 lukem Exp $   */
   2
   3
   4 #include <sys/cdefs.h>
   5 __FBSDID("$FreeBSD$");
   6 /*-
   7  * Copyright (c) 1998 The NetBSD Foundation, Inc.
   8  * All rights reserved.
   9  *
  10  * This code is derived from software contributed to The NetBSD Foundation
  11  * by Lennart Augustsson (lennart@augustsson.net) at
  12  * Carlstedt Research & Technology.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33  * POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <sys/stdint.h>
  37 #include <sys/stddef.h>
  38 #include <sys/param.h>
  39 #include <sys/queue.h>
  40 #include <sys/types.h>
  41 #include <sys/systm.h>
  42 #include <sys/kernel.h>
  43 #include <sys/bus.h>
  44 #include <sys/module.h>
  45 #include <sys/lock.h>
  46 #include <sys/mutex.h>
  47 #include <sys/condvar.h>
  48 #include <sys/sysctl.h>
  49 #include <sys/sx.h>
  50 #include <sys/unistd.h>
  51 #include <sys/callout.h>
  52 #include <sys/malloc.h>
  53 #include <sys/priv.h>
  54
  55 #include <dev/usb/usb.h>
  56 #include <dev/usb/usbdi.h>
  57 #include <dev/usb/usbdi_util.h>
  58 #include <dev/usb/usbhid.h>
  59
  60 #define USB_DEBUG_VAR usb_debug
  61
  62 #include <dev/usb/usb_core.h>
  63 #include <dev/usb/usb_debug.h>
  64 #include <dev/usb/usb_process.h>
  65 #include <dev/usb/usb_device.h>
  66 #include <dev/usb/usb_request.h>
  67
  68 static void hid_clear_local(struct hid_item *);
  69 static uint8_t hid_get_byte(struct hid_data *s, const uint16_t wSize);
  70
  71 #define MAXUSAGE 64
  72 #define MAXPUSH 4
  73 #define MAXID 16
  74
  75 struct hid_pos_data {
  76         int32_t rid;
  77         uint32_t pos;
  78 };
  79
  80 struct hid_data {
  81         const uint8_t *start;
  82         const uint8_t *end;
  83         const uint8_t *p;
  84         struct hid_item cur[MAXPUSH];
  85         struct hid_pos_data last_pos[MAXID];
  86         int32_t usages_min[MAXUSAGE];
  87         int32_t usages_max[MAXUSAGE];
  88         int32_t usage_last;     /* last seen usage */
  89         uint32_t loc_size;      /* last seen size */
  90         uint32_t loc_count;     /* last seen count */
  91         uint8_t kindset;        /* we have 5 kinds so 8 bits are enough */
  92         uint8_t pushlevel;      /* current pushlevel */
  93         uint8_t ncount;         /* end usage item count */
  94         uint8_t icount;         /* current usage item count */
  95         uint8_t nusage;         /* end "usages_min/max" index */
  96         uint8_t iusage;         /* current "usages_min/max" index */
  97         uint8_t ousage;         /* current "usages_min/max" offset */
  98         uint8_t susage;         /* usage set flags */
  99 };
 100
 101 /*------------------------------------------------------------------------*
 102  *      hid_clear_local
 103  *------------------------------------------------------------------------*/
 104 static void
 105 hid_clear_local(struct hid_item *c)
 106 {
 107
 108         c->loc.count = 0;
 109         c->loc.size = 0;
 110         c->usage = 0;
 111         c->usage_minimum = 0;
 112         c->usage_maximum = 0;
 113         c->designator_index = 0;
 114         c->designator_minimum = 0;
 115         c->designator_maximum = 0;
 116         c->string_index = 0;
 117         c->string_minimum = 0;
 118         c->string_maximum = 0;
 119         c->set_delimiter = 0;
 120 }
 121
 122 static void
 123 hid_switch_rid(struct hid_data *s, struct hid_item *c, int32_t next_rID)
 124 {
 125         uint8_t i;
 126
 127         /* check for same report ID - optimise */
 128
 129         if (c->report_ID == next_rID)
 130                 return;
 131
 132         /* save current position for current rID */
 133
 134         if (c->report_ID == 0) {
 135                 i = 0;
 136         } else {
 137                 for (i = 1; i != MAXID; i++) {
 138                         if (s->last_pos[i].rid == c->report_ID)
 139                                 break;
 140                         if (s->last_pos[i].rid == 0)
 141                                 break;
 142                 }
 143         }
 144         if (i != MAXID) {
 145                 s->last_pos[i].rid = c->report_ID;
 146                 s->last_pos[i].pos = c->loc.pos;
 147         }
 148
 149         /* store next report ID */
 150
 151         c->report_ID = next_rID;
 152
 153         /* lookup last position for next rID */
 154
 155         if (next_rID == 0) {
 156                 i = 0;
 157         } else {
 158                 for (i = 1; i != MAXID; i++) {
 159                         if (s->last_pos[i].rid == next_rID)
 160                                 break;
 161                         if (s->last_pos[i].rid == 0)
 162                                 break;
 163                 }
 164         }
 165         if (i != MAXID) {
 166                 s->last_pos[i].rid = next_rID;
 167                 c->loc.pos = s->last_pos[i].pos;
 168         } else {
 169                 DPRINTF("Out of RID entries, position is set to zero!\n");
 170                 c->loc.pos = 0;
 171         }
 172 }
 173
 174 /*------------------------------------------------------------------------*
 175  *      hid_start_parse
 176  *------------------------------------------------------------------------*/
 177 struct hid_data *
 178 hid_start_parse(const void *d, usb_size_t len, int kindset)
 179 {
 180         struct hid_data *s;
 181
 182         if ((kindset-1) & kindset) {
 183                 DPRINTFN(0, "Only one bit can be "
 184                     "set in the kindset\n");
 185                 return (NULL);
 186         }
 187
 188         s = malloc(sizeof *s, M_TEMP, M_WAITOK | M_ZERO);
 189         s->start = s->p = d;
 190         s->end = ((const uint8_t *)d) + len;
 191         s->kindset = kindset;
 192         return (s);
 193 }
 194
 195 /*------------------------------------------------------------------------*
 196  *      hid_end_parse
 197  *------------------------------------------------------------------------*/
 198 void
 199 hid_end_parse(struct hid_data *s)
 200 {
 201         if (s == NULL)
 202                 return;
 203
 204         free(s, M_TEMP);
 205 }
 206
 207 /*------------------------------------------------------------------------*
 208  *      get byte from HID descriptor
 209  *------------------------------------------------------------------------*/
 210 static uint8_t
 211 hid_get_byte(struct hid_data *s, const uint16_t wSize)
 212 {
 213         const uint8_t *ptr;
 214         uint8_t retval;
 215
 216         ptr = s->p;
 217
 218         /* check if end is reached */
 219         if (ptr == s->end)
 220                 return (0);
 221
 222         /* read out a byte */
 223         retval = *ptr;
 224
 225         /* check if data pointer can be advanced by "wSize" bytes */
 226         if ((s->end - ptr) < wSize)
 227                 ptr = s->end;
 228         else
 229                 ptr += wSize;
 230
 231         /* update pointer */
 232         s->p = ptr;
 233
 234         return (retval);
 235 }
 236
 237 /*------------------------------------------------------------------------*
 238  *      hid_get_item
 239  *------------------------------------------------------------------------*/
 240 int
 241 hid_get_item(struct hid_data *s, struct hid_item *h)
 242 {
 243         struct hid_item *c;
 244         unsigned int bTag, bType, bSize;
 245         uint32_t oldpos;
 246         int32_t mask;
 247         int32_t dval;
 248
 249         if (s == NULL)
 250                 return (0);
 251
 252         c = &s->cur[s->pushlevel];
 253
 254  top:
 255         /* check if there is an array of items */
 256         if (s->icount < s->ncount) {
 257                 /* get current usage */
 258                 if (s->iusage < s->nusage) {
 259                         dval = s->usages_min[s->iusage] + s->ousage;
 260                         c->usage = dval;
 261                         s->usage_last = dval;
 262                         if (dval == s->usages_max[s->iusage]) {
 263                                 s->iusage ++;
 264                                 s->ousage = 0;
 265                         } else {
 266                                 s->ousage ++;
 267                         }
 268                 } else {
 269                         DPRINTFN(1, "Using last usage\n");
 270                         dval = s->usage_last;
 271                 }
 272                 s->icount ++;
 273                 /*
 274                  * Only copy HID item, increment position and return
 275                  * if correct kindset!
 276                  */
 277                 if (s->kindset & (1 << c->kind)) {
 278                         *h = *c;
 279                         DPRINTFN(1, "%u,%u,%u\n", h->loc.pos,
 280                             h->loc.size, h->loc.count);
 281                         c->loc.pos += c->loc.size * c->loc.count;
 282                         return (1);
 283                 }
 284         }
 285
 286         /* reset state variables */
 287         s->icount = 0;
 288         s->ncount = 0;
 289         s->iusage = 0;
 290         s->nusage = 0;
 291         s->susage = 0;
 292         s->ousage = 0;
 293         hid_clear_local(c);
 294
 295         /* get next item */
 296         while (s->p != s->end) {
 297
 298                 bSize = hid_get_byte(s, 1);
 299                 if (bSize == 0xfe) {
 300                         /* long item */
 301                         bSize = hid_get_byte(s, 1);
 302                         bSize |= hid_get_byte(s, 1) << 8;
 303                         bTag = hid_get_byte(s, 1);
 304                         bType = 0xff;   /* XXX what should it be */
 305                 } else {
 306                         /* short item */
 307                         bTag = bSize >> 4;
 308                         bType = (bSize >> 2) & 3;
 309                         bSize &= 3;
 310                         if (bSize == 3)
 311                                 bSize = 4;
 312                 }
 313                 switch (bSize) {
 314                 case 0:
 315                         dval = 0;
 316                         mask = 0;
 317                         break;
 318                 case 1:
 319                         dval = (int8_t)hid_get_byte(s, 1);
 320                         mask = 0xFF;
 321                         break;
 322                 case 2:
 323                         dval = hid_get_byte(s, 1);
 324                         dval |= hid_get_byte(s, 1) << 8;
 325                         dval = (int16_t)dval;
 326                         mask = 0xFFFF;
 327                         break;
 328                 case 4:
 329                         dval = hid_get_byte(s, 1);
 330                         dval |= hid_get_byte(s, 1) << 8;
 331                         dval |= hid_get_byte(s, 1) << 16;
 332                         dval |= hid_get_byte(s, 1) << 24;
 333                         mask = 0xFFFFFFFF;
 334                         break;
 335                 default:
 336                         dval = hid_get_byte(s, bSize);
 337                         DPRINTFN(0, "bad length %u (data=0x%02x)\n",
 338                             bSize, dval);
 339                         continue;
 340                 }
 341
 342                 switch (bType) {
 343                 case 0:         /* Main */
 344                         switch (bTag) {
 345                         case 8: /* Input */
 346                                 c->kind = hid_input;
 347                                 c->flags = dval;
 348                 ret:
 349                                 c->loc.count = s->loc_count;
 350                                 c->loc.size = s->loc_size;
 351
 352                                 if (c->flags & HIO_VARIABLE) {
 353                                         /* range check usage count */
 354                                         if (c->loc.count > 255) {
 355                                                 DPRINTFN(0, "Number of "
 356                                                     "items(%u) truncated to 255\n",
 357                                                     (unsigned)(c->loc.count));
 358                                                 s->ncount = 255;
 359                                         } else
 360                                                 s->ncount = c->loc.count;
 361
 362                                         /*
 363                                          * The "top" loop will return
 364                                          * one and one item:
 365                                          */
 366                                         c->loc.count = 1;
 367                                 } else {
 368                                         s->ncount = 1;
 369                                 }
 370                                 goto top;
 371
 372                         case 9: /* Output */
 373                                 c->kind = hid_output;
 374                                 c->flags = dval;
 375                                 goto ret;
 376                         case 10:        /* Collection */
 377                                 c->kind = hid_collection;
 378                                 c->collection = dval;
 379                                 c->collevel++;
 380                                 c->usage = s->usage_last;
 381                                 *h = *c;
 382                                 return (1);
 383                         case 11:        /* Feature */
 384                                 c->kind = hid_feature;
 385                                 c->flags = dval;
 386                                 goto ret;
 387                         case 12:        /* End collection */
 388                                 c->kind = hid_endcollection;
 389                                 if (c->collevel == 0) {
 390                                         DPRINTFN(0, "invalid end collection\n");
 391                                         return (0);
 392                                 }
 393                                 c->collevel--;
 394                                 *h = *c;
 395                                 return (1);
 396                         default:
 397                                 DPRINTFN(0, "Main bTag=%d\n", bTag);
 398                                 break;
 399                         }
 400                         break;
 401                 case 1:         /* Global */
 402                         switch (bTag) {
 403                         case 0:
 404                                 c->_usage_page = dval << 16;
 405                                 break;
 406                         case 1:
 407                                 c->logical_minimum = dval;
 408                                 break;
 409                         case 2:
 410                                 c->logical_maximum = dval;
 411                                 break;
 412                         case 3:
 413                                 c->physical_minimum = dval;
 414                                 break;
 415                         case 4:
 416                                 c->physical_maximum = dval;
 417                                 break;
 418                         case 5:
 419                                 c->unit_exponent = dval;
 420                                 break;
 421                         case 6:
 422                                 c->unit = dval;
 423                                 break;
 424                         case 7:
 425                                 /* mask because value is unsigned */
 426                                 s->loc_size = dval & mask;
 427                                 break;
 428                         case 8:
 429                                 hid_switch_rid(s, c, dval & mask);
 430                                 break;
 431                         case 9:
 432                                 /* mask because value is unsigned */
 433                                 s->loc_count = dval & mask;
 434                                 break;
 435                         case 10:        /* Push */
 436                                 /* stop parsing, if invalid push level */
 437                                 if ((s->pushlevel + 1) >= MAXPUSH) {
 438                                         DPRINTFN(0, "Cannot push item @ %d\n", s->pushlevel);
 439                                         return (0);
 440                                 }
 441                                 s->pushlevel ++;
 442                                 s->cur[s->pushlevel] = *c;
 443                                 /* store size and count */
 444                                 c->loc.size = s->loc_size;
 445                                 c->loc.count = s->loc_count;
 446                                 /* update current item pointer */
 447                                 c = &s->cur[s->pushlevel];
 448                                 break;
 449                         case 11:        /* Pop */
 450                                 /* stop parsing, if invalid push level */
 451                                 if (s->pushlevel == 0) {
 452                                         DPRINTFN(0, "Cannot pop item @ 0\n");
 453                                         return (0);
 454                                 }
 455                                 s->pushlevel --;
 456                                 /* preserve position */
 457                                 oldpos = c->loc.pos;
 458                                 c = &s->cur[s->pushlevel];
 459                                 /* restore size and count */
 460                                 s->loc_size = c->loc.size;
 461                                 s->loc_count = c->loc.count;
 462                                 /* set default item location */
 463                                 c->loc.pos = oldpos;
 464                                 c->loc.size = 0;
 465                                 c->loc.count = 0;
 466                                 break;
 467                         default:
 468                                 DPRINTFN(0, "Global bTag=%d\n", bTag);
 469                                 break;
 470                         }
 471                         break;
 472                 case 2:         /* Local */
 473                         switch (bTag) {
 474                         case 0:
 475                                 if (bSize != 4)
 476                                         dval = (dval & mask) | c->_usage_page;
 477
 478                                 /* set last usage, in case of a collection */
 479                                 s->usage_last = dval;
 480
 481                                 if (s->nusage < MAXUSAGE) {
 482                                         s->usages_min[s->nusage] = dval;
 483                                         s->usages_max[s->nusage] = dval;
 484                                         s->nusage ++;
 485                                 } else {
 486                                         DPRINTFN(0, "max usage reached\n");
 487                                 }
 488
 489                                 /* clear any pending usage sets */
 490                                 s->susage = 0;
 491                                 break;
 492                         case 1:
 493                                 s->susage |= 1;
 494
 495                                 if (bSize != 4)
 496                                         dval = (dval & mask) | c->_usage_page;
 497                                 c->usage_minimum = dval;
 498
 499                                 goto check_set;
 500                         case 2:
 501                                 s->susage |= 2;
 502
 503                                 if (bSize != 4)
 504                                         dval = (dval & mask) | c->_usage_page;
 505                                 c->usage_maximum = dval;
 506
 507                         check_set:
 508                                 if (s->susage != 3)
 509                                         break;
 510
 511                                 /* sanity check */
 512                                 if ((s->nusage < MAXUSAGE) &&
 513                                     (c->usage_minimum <= c->usage_maximum)) {
 514                                         /* add usage range */
 515                                         s->usages_min[s->nusage] =
 516                                             c->usage_minimum;
 517                                         s->usages_max[s->nusage] =
 518                                             c->usage_maximum;
 519                                         s->nusage ++;
 520                                 } else {
 521                                         DPRINTFN(0, "Usage set dropped\n");
 522                                 }
 523                                 s->susage = 0;
 524                                 break;
 525                         case 3:
 526                                 c->designator_index = dval;
 527                                 break;
 528                         case 4:
 529                                 c->designator_minimum = dval;
 530                                 break;
 531                         case 5:
 532                                 c->designator_maximum = dval;
 533                                 break;
 534                         case 7:
 535                                 c->string_index = dval;
 536                                 break;
 537                         case 8:
 538                                 c->string_minimum = dval;
 539                                 break;
 540                         case 9:
 541                                 c->string_maximum = dval;
 542                                 break;
 543                         case 10:
 544                                 c->set_delimiter = dval;
 545                                 break;
 546                         default:
 547                                 DPRINTFN(0, "Local bTag=%d\n", bTag);
 548                                 break;
 549                         }
 550                         break;
 551                 default:
 552                         DPRINTFN(0, "default bType=%d\n", bType);
 553                         break;
 554                 }
 555         }
 556         return (0);
 557 }
 558
 559 /*------------------------------------------------------------------------*
 560  *      hid_report_size
 561  *------------------------------------------------------------------------*/
 562 int
 563 hid_report_size(const void *buf, usb_size_t len, enum hid_kind k, uint8_t *id)
 564 {
 565         struct hid_data *d;
 566         struct hid_item h;
 567         uint32_t temp;
 568         uint32_t hpos;
 569         uint32_t lpos;
 570         uint8_t any_id;
 571
 572         any_id = 0;
 573         hpos = 0;
 574         lpos = 0xFFFFFFFF;
 575
 576         for (d = hid_start_parse(buf, len, 1 << k); hid_get_item(d, &h);) {
 577                 if (h.kind == k) {
 578                         /* check for ID-byte presense */
 579                         if ((h.report_ID != 0) && !any_id) {
 580                                 if (id != NULL)
 581                                         *id = h.report_ID;
 582                                 any_id = 1;
 583                         }
 584                         /* compute minimum */
 585                         if (lpos > h.loc.pos)
 586                                 lpos = h.loc.pos;
 587                         /* compute end position */
 588                         temp = h.loc.pos + (h.loc.size * h.loc.count);
 589                         /* compute maximum */
 590                         if (hpos < temp)
 591                                 hpos = temp;
 592                 }
 593         }
 594         hid_end_parse(d);
 595
 596         /* safety check - can happen in case of currupt descriptors */
 597         if (lpos > hpos)
 598                 temp = 0;
 599         else
 600                 temp = hpos - lpos;
 601
 602         /* check for ID byte */
 603         if (any_id)
 604                 temp += 8;
 605         else if (id != NULL)
 606                 *id = 0;
 607
 608         /* return length in bytes rounded up */
 609         return ((temp + 7) / 8);
 610 }
 611
 612 /*------------------------------------------------------------------------*
 613  *      hid_locate
 614  *------------------------------------------------------------------------*/
 615 int
 616 hid_locate(const void *desc, usb_size_t size, int32_t u, enum hid_kind k,
 617     uint8_t index, struct hid_location *loc, uint32_t *flags, uint8_t *id)
 618 {
 619         struct hid_data *d;
 620         struct hid_item h;
 621
 622         for (d = hid_start_parse(desc, size, 1 << k); hid_get_item(d, &h);) {
 623                 if (h.kind == k && !(h.flags & HIO_CONST) && h.usage == u) {
 624                         if (index--)
 625                                 continue;
 626                         if (loc != NULL)
 627                                 *loc = h.loc;
 628                         if (flags != NULL)
 629                                 *flags = h.flags;
 630                         if (id != NULL)
 631                                 *id = h.report_ID;
 632                         hid_end_parse(d);
 633                         return (1);
 634                 }
 635         }
 636         if (loc != NULL)
 637                 loc->size = 0;
 638         if (flags != NULL)
 639                 *flags = 0;
 640         if (id != NULL)
 641                 *id = 0;
 642         hid_end_parse(d);
 643         return (0);
 644 }
 645
 646 /*------------------------------------------------------------------------*
 647  *      hid_get_data
 648  *------------------------------------------------------------------------*/
 649 static uint32_t
 650 hid_get_data_sub(const uint8_t *buf, usb_size_t len, struct hid_location *loc,
 651     int is_signed)
 652 {
 653         uint32_t hpos = loc->pos;
 654         uint32_t hsize = loc->size;
 655         uint32_t data;
 656         uint32_t rpos;
 657         uint8_t n;
 658
 659         DPRINTFN(11, "hid_get_data: loc %d/%d\n", hpos, hsize);
 660
 661         /* Range check and limit */
 662         if (hsize == 0)
 663                 return (0);
 664         if (hsize > 32)
 665                 hsize = 32;
 666
 667         /* Get data in a safe way */
 668         data = 0;
 669         rpos = (hpos / 8);
 670         n = (hsize + 7) / 8;
 671         rpos += n;
 672         while (n--) {
 673                 rpos--;
 674                 if (rpos < len)
 675                         data |= buf[rpos] << (8 * n);
 676         }
 677
 678         /* Correctly shift down data */
 679         data = (data >> (hpos % 8));
 680         n = 32 - hsize;
 681
 682         /* Mask and sign extend in one */
 683         if (is_signed != 0)
 684                 data = (int32_t)((int32_t)data << n) >> n;
 685         else
 686                 data = (uint32_t)((uint32_t)data << n) >> n;
 687
 688         DPRINTFN(11, "hid_get_data: loc %d/%d = %lu\n",
 689             loc->pos, loc->size, (long)data);
 690         return (data);
 691 }
 692
 693 int32_t
 694 hid_get_data(const uint8_t *buf, usb_size_t len, struct hid_location *loc)
 695 {
 696         return (hid_get_data_sub(buf, len, loc, 1));
 697 }
 698
 699 uint32_t
 700 hid_get_data_unsigned(const uint8_t *buf, usb_size_t len, struct hid_location *loc)
 701 {
 702         return (hid_get_data_sub(buf, len, loc, 0));
 703 }
 704
 705 /*------------------------------------------------------------------------*
 706  *      hid_put_data
 707  *------------------------------------------------------------------------*/
 708 void
 709 hid_put_data_unsigned(uint8_t *buf, usb_size_t len,
 710     struct hid_location *loc, unsigned int value)
 711 {
 712         uint32_t hpos = loc->pos;
 713         uint32_t hsize = loc->size;
 714         uint64_t data;
 715         uint64_t mask;
 716         uint32_t rpos;
 717         uint8_t n;
 718
 719         DPRINTFN(11, "hid_put_data: loc %d/%d = %u\n", hpos, hsize, value);
 720
 721         /* Range check and limit */
 722         if (hsize == 0)
 723                 return;
 724         if (hsize > 32)
 725                 hsize = 32;
 726
 727         /* Put data in a safe way */
 728         rpos = (hpos / 8);
 729         n = (hsize + 7) / 8;
 730         data = ((uint64_t)value) << (hpos % 8);
 731         mask = ((1ULL << hsize) - 1ULL) << (hpos % 8);
 732         rpos += n;
 733         while (n--) {
 734                 rpos--;
 735                 if (rpos < len) {
 736                         buf[rpos] &= ~(mask >> (8 * n));
 737                         buf[rpos] |= (data >> (8 * n));
 738                 }
 739         }
 740 }
 741
 742 /*------------------------------------------------------------------------*
 743  *      hid_is_collection
 744  *------------------------------------------------------------------------*/
 745 int
 746 hid_is_collection(const void *desc, usb_size_t size, int32_t usage)
 747 {
 748         struct hid_data *hd;
 749         struct hid_item hi;
 750         int err;
 751
 752         hd = hid_start_parse(desc, size, hid_input);
 753         if (hd == NULL)
 754                 return (0);
 755
 756         while ((err = hid_get_item(hd, &hi))) {
 757                  if (hi.kind == hid_collection &&
 758                      hi.usage == usage)
 759                         break;
 760         }
 761         hid_end_parse(hd);
 762         return (err);
 763 }
 764
 765 /*------------------------------------------------------------------------*
 766  *      hid_get_descriptor_from_usb
 767  *
 768  * This function will search for a HID descriptor between two USB
 769  * interface descriptors.
 770  *
 771  * Return values:
 772  * NULL: No more HID descriptors.
 773  * Else: Pointer to HID descriptor.
 774  *------------------------------------------------------------------------*/
 775 struct usb_hid_descriptor *
 776 hid_get_descriptor_from_usb(struct usb_config_descriptor *cd,
 777     struct usb_interface_descriptor *id)
 778 {
 779         struct usb_descriptor *desc = (void *)id;
 780
 781         if (desc == NULL) {
 782                 return (NULL);
 783         }
 784         while ((desc = usb_desc_foreach(cd, desc))) {
 785                 if ((desc->bDescriptorType == UDESC_HID) &&
 786                     (desc->bLength >= USB_HID_DESCRIPTOR_SIZE(0))) {
 787                         return (void *)desc;
 788                 }
 789                 if (desc->bDescriptorType == UDESC_INTERFACE) {
 790                         break;
 791                 }
 792         }
 793         return (NULL);
 794 }
 795
 796 /*------------------------------------------------------------------------*
 797  *      usbd_req_get_hid_desc
 798  *
 799  * This function will read out an USB report descriptor from the USB
 800  * device.
 801  *
 802  * Return values:
 803  * NULL: Failure.
 804  * Else: Success. The pointer should eventually be passed to free().
 805  *------------------------------------------------------------------------*/
 806 usb_error_t
 807 usbd_req_get_hid_desc(struct usb_device *udev, struct mtx *mtx,
 808     void **descp, uint16_t *sizep,
 809     struct malloc_type *mem, uint8_t iface_index)
 810 {
 811         struct usb_interface *iface = usbd_get_iface(udev, iface_index);
 812         struct usb_hid_descriptor *hid;
 813         usb_error_t err;
 814
 815         if ((iface == NULL) || (iface->idesc == NULL)) {
 816                 return (USB_ERR_INVAL);
 817         }
 818         hid = hid_get_descriptor_from_usb
 819             (usbd_get_config_descriptor(udev), iface->idesc);
 820
 821         if (hid == NULL) {
 822                 return (USB_ERR_IOERROR);
 823         }
 824         *sizep = UGETW(hid->descrs[0].wDescriptorLength);
 825         if (*sizep == 0) {
 826                 return (USB_ERR_IOERROR);
 827         }
 828         if (mtx)
 829                 mtx_unlock(mtx);
 830
 831         *descp = malloc(*sizep, mem, M_ZERO | M_WAITOK);
 832
 833         if (mtx)
 834                 mtx_lock(mtx);
 835
 836         if (*descp == NULL) {
 837                 return (USB_ERR_NOMEM);
 838         }
 839         err = usbd_req_get_report_descriptor
 840             (udev, mtx, *descp, *sizep, iface_index);
 841
 842         if (err) {
 843                 free(*descp, mem);
 844                 *descp = NULL;
 845                 return (err);
 846         }
 847         return (USB_ERR_NORMAL_COMPLETION);
 848 }
 849
 850 /*------------------------------------------------------------------------*
 851  *      hid_is_mouse
 852  *
 853  * This function will decide if a USB descriptor belongs to a USB mouse.
 854  *
 855  * Return values:
 856  * Zero: Not a USB mouse.
 857  * Else: Is a USB mouse.
 858  *------------------------------------------------------------------------*/
 859 int
 860 hid_is_mouse(const void *d_ptr, uint16_t d_len)
 861 {
 862         struct hid_data *hd;
 863         struct hid_item hi;
 864         int mdepth;
 865         int found;
 866
 867         hd = hid_start_parse(d_ptr, d_len, 1 << hid_input);
 868         if (hd == NULL)
 869                 return (0);
 870
 871         mdepth = 0;
 872         found = 0;
 873
 874         while (hid_get_item(hd, &hi)) {
 875                 switch (hi.kind) {
 876                 case hid_collection:
 877                         if (mdepth != 0)
 878                                 mdepth++;
 879                         else if (hi.collection == 1 &&
 880                              hi.usage ==
 881                               HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_MOUSE))
 882                                 mdepth++;
 883                         break;
 884                 case hid_endcollection:
 885                         if (mdepth != 0)
 886                                 mdepth--;
 887                         break;
 888                 case hid_input:
 889                         if (mdepth == 0)
 890                                 break;
 891                         if (hi.usage ==
 892                              HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_X) &&
 893                             (hi.flags & (HIO_CONST|HIO_RELATIVE)) == HIO_RELATIVE)
 894                                 found++;
 895                         if (hi.usage ==
 896                              HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_Y) &&
 897                             (hi.flags & (HIO_CONST|HIO_RELATIVE)) == HIO_RELATIVE)
 898                                 found++;
 899                         break;
 900                 default:
 901                         break;
 902                 }
 903         }
 904         hid_end_parse(hd);
 905         return (found);
 906 }
 907
 908 /*------------------------------------------------------------------------*
 909  *      hid_is_keyboard
 910  *
 911  * This function will decide if a USB descriptor belongs to a USB keyboard.
 912  *
 913  * Return values:
 914  * Zero: Not a USB keyboard.
 915  * Else: Is a USB keyboard.
 916  *------------------------------------------------------------------------*/
 917 int
 918 hid_is_keyboard(const void *d_ptr, uint16_t d_len)
 919 {
 920         if (hid_is_collection(d_ptr, d_len,
 921             HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_KEYBOARD)))
 922                 return (1);
 923         return (0);
 924 }