uhid.c revision 1.86
1 /* $NetBSD: uhid.c,v 1.86 2012/03/06 03:35:29 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1998, 2004, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Lennart Augustsson (lennart (at) augustsson.net) at 9 * Carlstedt Research & Technology. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * HID spec: http://www.usb.org/developers/devclass_docs/HID1_11.pdf 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: uhid.c,v 1.86 2012/03/06 03:35:29 mrg Exp $"); 39 40 #include "opt_compat_netbsd.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/kernel.h> 45 #include <sys/malloc.h> 46 #include <sys/signalvar.h> 47 #include <sys/device.h> 48 #include <sys/ioctl.h> 49 #include <sys/conf.h> 50 #include <sys/tty.h> 51 #include <sys/file.h> 52 #include <sys/select.h> 53 #include <sys/proc.h> 54 #include <sys/vnode.h> 55 #include <sys/poll.h> 56 #include <sys/intr.h> 57 58 #include <dev/usb/usb.h> 59 #include <dev/usb/usbhid.h> 60 61 #include <dev/usb/usbdevs.h> 62 #include <dev/usb/usbdi.h> 63 #include <dev/usb/usbdi_util.h> 64 #include <dev/usb/hid.h> 65 #include <dev/usb/usb_quirks.h> 66 67 #include <dev/usb/uhidev.h> 68 69 #ifdef UHID_DEBUG 70 #define DPRINTF(x) if (uhiddebug) printf x 71 #define DPRINTFN(n,x) if (uhiddebug>(n)) printf x 72 int uhiddebug = 0; 73 #else 74 #define DPRINTF(x) 75 #define DPRINTFN(n,x) 76 #endif 77 78 struct uhid_softc { 79 struct uhidev sc_hdev; 80 81 int sc_isize; 82 int sc_osize; 83 int sc_fsize; 84 85 u_char *sc_obuf; 86 87 struct clist sc_q; 88 struct selinfo sc_rsel; 89 proc_t *sc_async; /* process that wants SIGIO */ 90 void *sc_sih; 91 u_char sc_state; /* driver state */ 92 #define UHID_ASLP 0x01 /* waiting for device data */ 93 #define UHID_IMMED 0x02 /* return read data immediately */ 94 95 int sc_refcnt; 96 u_char sc_dying; 97 }; 98 99 #define UHIDUNIT(dev) (minor(dev)) 100 #define UHID_CHUNK 128 /* chunk size for read */ 101 #define UHID_BSIZE 1020 /* buffer size */ 102 103 dev_type_open(uhidopen); 104 dev_type_close(uhidclose); 105 dev_type_read(uhidread); 106 dev_type_write(uhidwrite); 107 dev_type_ioctl(uhidioctl); 108 dev_type_poll(uhidpoll); 109 dev_type_kqfilter(uhidkqfilter); 110 111 const struct cdevsw uhid_cdevsw = { 112 uhidopen, uhidclose, uhidread, uhidwrite, uhidioctl, 113 nostop, notty, uhidpoll, nommap, uhidkqfilter, D_OTHER, 114 }; 115 116 Static void uhid_intr(struct uhidev *, void *, u_int len); 117 Static void uhid_softintr(void *); 118 119 Static int uhid_do_read(struct uhid_softc *, struct uio *uio, int); 120 Static int uhid_do_write(struct uhid_softc *, struct uio *uio, int); 121 Static int uhid_do_ioctl(struct uhid_softc*, u_long, void *, int, struct lwp *); 122 123 int uhid_match(device_t, cfdata_t, void *); 124 void uhid_attach(device_t, device_t, void *); 125 int uhid_detach(device_t, int); 126 int uhid_activate(device_t, enum devact); 127 extern struct cfdriver uhid_cd; 128 CFATTACH_DECL_NEW(uhid, sizeof(struct uhid_softc), uhid_match, uhid_attach, uhid_detach, uhid_activate); 129 130 int 131 uhid_match(device_t parent, cfdata_t match, void *aux) 132 { 133 #ifdef UHID_DEBUG 134 struct uhidev_attach_arg *uha = aux; 135 #endif 136 137 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 138 139 if (match->cf_flags & 1) 140 return (UMATCH_HIGHEST); 141 else 142 return (UMATCH_IFACECLASS_GENERIC); 143 } 144 145 void 146 uhid_attach(device_t parent, device_t self, void *aux) 147 { 148 struct uhid_softc *sc = device_private(self); 149 struct uhidev_attach_arg *uha = aux; 150 int size, repid; 151 void *desc; 152 153 sc->sc_hdev.sc_dev = self; 154 selinit(&sc->sc_rsel); 155 sc->sc_hdev.sc_intr = uhid_intr; 156 sc->sc_hdev.sc_parent = uha->parent; 157 sc->sc_hdev.sc_report_id = uha->reportid; 158 sc->sc_sih = softint_establish(SOFTINT_MPSAFE | SOFTINT_CLOCK, 159 uhid_softintr, sc); 160 161 uhidev_get_report_desc(uha->parent, &desc, &size); 162 repid = uha->reportid; 163 sc->sc_isize = hid_report_size(desc, size, hid_input, repid); 164 sc->sc_osize = hid_report_size(desc, size, hid_output, repid); 165 sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid); 166 167 aprint_naive("\n"); 168 aprint_normal(": input=%d, output=%d, feature=%d\n", 169 sc->sc_isize, sc->sc_osize, sc->sc_fsize); 170 171 if (!pmf_device_register(self, NULL, NULL)) 172 aprint_error_dev(self, "couldn't establish power handler\n"); 173 174 return; 175 } 176 177 int 178 uhid_activate(device_t self, enum devact act) 179 { 180 struct uhid_softc *sc = device_private(self); 181 182 switch (act) { 183 case DVACT_DEACTIVATE: 184 sc->sc_dying = 1; 185 return 0; 186 default: 187 return EOPNOTSUPP; 188 } 189 } 190 191 int 192 uhid_detach(device_t self, int flags) 193 { 194 struct uhid_softc *sc = device_private(self); 195 int s; 196 int maj, mn; 197 198 DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); 199 200 sc->sc_dying = 1; 201 202 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 203 s = splusb(); 204 if (--sc->sc_refcnt >= 0) { 205 /* Wake everyone */ 206 wakeup(&sc->sc_q); 207 /* Wait for processes to go away. */ 208 usb_detach_waitold(sc->sc_hdev.sc_dev); 209 } 210 splx(s); 211 } 212 213 /* locate the major number */ 214 maj = cdevsw_lookup_major(&uhid_cdevsw); 215 216 /* Nuke the vnodes for any open instances (calls close). */ 217 mn = device_unit(self); 218 vdevgone(maj, mn, mn, VCHR); 219 220 #if 0 221 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, 222 sc->sc_hdev.sc_parent->sc_udev, 223 sc->sc_hdev.sc_dev); 224 #endif 225 seldestroy(&sc->sc_rsel); 226 softint_disestablish(sc->sc_sih); 227 228 return (0); 229 } 230 231 void 232 uhid_intr(struct uhidev *addr, void *data, u_int len) 233 { 234 struct uhid_softc *sc = (struct uhid_softc *)addr; 235 236 #ifdef UHID_DEBUG 237 if (uhiddebug > 5) { 238 u_int32_t i; 239 240 DPRINTF(("uhid_intr: data =")); 241 for (i = 0; i < len; i++) 242 DPRINTF((" %02x", ((u_char *)data)[i])); 243 DPRINTF(("\n")); 244 } 245 #endif 246 247 (void)b_to_q(data, len, &sc->sc_q); 248 249 if (sc->sc_state & UHID_ASLP) { 250 sc->sc_state &= ~UHID_ASLP; 251 DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); 252 wakeup(&sc->sc_q); 253 } 254 selnotify(&sc->sc_rsel, 0, 0); 255 if (sc->sc_async != NULL) { 256 DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async)); 257 softint_schedule(sc->sc_sih); 258 } 259 } 260 261 void 262 uhid_softintr(void *cookie) 263 { 264 struct uhid_softc *sc; 265 266 sc = cookie; 267 268 mutex_enter(proc_lock); 269 if (sc->sc_async != NULL) 270 psignal(sc->sc_async, SIGIO); 271 mutex_exit(proc_lock); 272 } 273 274 int 275 uhidopen(dev_t dev, int flag, int mode, 276 struct lwp *l) 277 { 278 struct uhid_softc *sc; 279 int error; 280 281 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 282 if (sc == NULL) 283 return ENXIO; 284 285 DPRINTF(("uhidopen: sc=%p\n", sc)); 286 287 if (sc->sc_dying) 288 return (ENXIO); 289 290 error = uhidev_open(&sc->sc_hdev); 291 if (error) 292 return (error); 293 294 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 295 uhidev_close(&sc->sc_hdev); 296 return (ENOMEM); 297 } 298 sc->sc_obuf = malloc(sc->sc_osize, M_USBDEV, M_WAITOK); 299 sc->sc_state &= ~UHID_IMMED; 300 mutex_enter(proc_lock); 301 sc->sc_async = NULL; 302 mutex_exit(proc_lock); 303 304 return (0); 305 } 306 307 int 308 uhidclose(dev_t dev, int flag, int mode, 309 struct lwp *l) 310 { 311 struct uhid_softc *sc; 312 313 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 314 315 DPRINTF(("uhidclose: sc=%p\n", sc)); 316 317 clfree(&sc->sc_q); 318 free(sc->sc_obuf, M_USBDEV); 319 mutex_enter(proc_lock); 320 sc->sc_async = NULL; 321 mutex_exit(proc_lock); 322 uhidev_close(&sc->sc_hdev); 323 324 return (0); 325 } 326 327 int 328 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 329 { 330 int s; 331 int error = 0; 332 int extra; 333 size_t length; 334 u_char buffer[UHID_CHUNK]; 335 usbd_status err; 336 337 DPRINTFN(1, ("uhidread\n")); 338 if (sc->sc_state & UHID_IMMED) { 339 DPRINTFN(1, ("uhidread immed\n")); 340 extra = sc->sc_hdev.sc_report_id != 0; 341 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 342 buffer, sc->sc_isize + extra); 343 if (err) 344 return (EIO); 345 return (uiomove(buffer+extra, sc->sc_isize, uio)); 346 } 347 348 s = splusb(); 349 while (sc->sc_q.c_cc == 0) { 350 if (flag & IO_NDELAY) { 351 splx(s); 352 return (EWOULDBLOCK); 353 } 354 sc->sc_state |= UHID_ASLP; 355 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 356 error = tsleep(&sc->sc_q, PZERO | PCATCH, "uhidrea", 0); 357 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 358 if (sc->sc_dying) 359 error = EIO; 360 if (error) { 361 sc->sc_state &= ~UHID_ASLP; 362 break; 363 } 364 } 365 splx(s); 366 367 /* Transfer as many chunks as possible. */ 368 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 369 length = min(sc->sc_q.c_cc, uio->uio_resid); 370 if (length > sizeof(buffer)) 371 length = sizeof(buffer); 372 373 /* Remove a small chunk from the input queue. */ 374 (void) q_to_b(&sc->sc_q, buffer, length); 375 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 376 377 /* Copy the data to the user process. */ 378 if ((error = uiomove(buffer, length, uio)) != 0) 379 break; 380 } 381 382 return (error); 383 } 384 385 int 386 uhidread(dev_t dev, struct uio *uio, int flag) 387 { 388 struct uhid_softc *sc; 389 int error; 390 391 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 392 393 sc->sc_refcnt++; 394 error = uhid_do_read(sc, uio, flag); 395 if (--sc->sc_refcnt < 0) 396 usb_detach_wakeupold(sc->sc_hdev.sc_dev); 397 return (error); 398 } 399 400 int 401 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 402 { 403 int error; 404 int size; 405 usbd_status err; 406 407 DPRINTFN(1, ("uhidwrite\n")); 408 409 if (sc->sc_dying) 410 return (EIO); 411 412 size = sc->sc_osize; 413 error = 0; 414 if (uio->uio_resid != size) 415 return (EINVAL); 416 error = uiomove(sc->sc_obuf, size, uio); 417 if (!error) { 418 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 419 sc->sc_obuf, size); 420 if (err) 421 error = EIO; 422 } 423 424 return (error); 425 } 426 427 int 428 uhidwrite(dev_t dev, struct uio *uio, int flag) 429 { 430 struct uhid_softc *sc; 431 int error; 432 433 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 434 435 sc->sc_refcnt++; 436 error = uhid_do_write(sc, uio, flag); 437 if (--sc->sc_refcnt < 0) 438 usb_detach_wakeupold(sc->sc_hdev.sc_dev); 439 return (error); 440 } 441 442 int 443 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr, 444 int flag, struct lwp *l) 445 { 446 struct usb_ctl_report_desc *rd; 447 struct usb_ctl_report *re; 448 u_char buffer[UHID_CHUNK]; 449 int size, extra; 450 usbd_status err; 451 void *desc; 452 453 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 454 455 if (sc->sc_dying) 456 return (EIO); 457 458 switch (cmd) { 459 case FIONBIO: 460 /* All handled in the upper FS layer. */ 461 break; 462 463 case FIOASYNC: 464 mutex_enter(proc_lock); 465 if (*(int *)addr) { 466 if (sc->sc_async != NULL) 467 return (EBUSY); 468 sc->sc_async = l->l_proc; 469 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 470 } else 471 sc->sc_async = NULL; 472 mutex_exit(proc_lock); 473 break; 474 475 /* XXX this is not the most general solution. */ 476 case TIOCSPGRP: 477 mutex_enter(proc_lock); 478 if (sc->sc_async == NULL) { 479 mutex_exit(proc_lock); 480 return (EINVAL); 481 } 482 if (*(int *)addr != sc->sc_async->p_pgid) { 483 mutex_exit(proc_lock); 484 return (EPERM); 485 } 486 mutex_exit(proc_lock); 487 break; 488 489 case FIOSETOWN: 490 mutex_enter(proc_lock); 491 if (sc->sc_async == NULL) { 492 mutex_exit(proc_lock); 493 return (EINVAL); 494 } 495 if (-*(int *)addr != sc->sc_async->p_pgid 496 && *(int *)addr != sc->sc_async->p_pid) { 497 mutex_exit(proc_lock); 498 return (EPERM); 499 } 500 mutex_exit(proc_lock); 501 break; 502 503 case USB_GET_REPORT_DESC: 504 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 505 rd = (struct usb_ctl_report_desc *)addr; 506 size = min(size, sizeof rd->ucrd_data); 507 rd->ucrd_size = size; 508 memcpy(rd->ucrd_data, desc, size); 509 break; 510 511 case USB_SET_IMMED: 512 if (*(int *)addr) { 513 extra = sc->sc_hdev.sc_report_id != 0; 514 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 515 buffer, sc->sc_isize + extra); 516 if (err) 517 return (EOPNOTSUPP); 518 519 sc->sc_state |= UHID_IMMED; 520 } else 521 sc->sc_state &= ~UHID_IMMED; 522 break; 523 524 case USB_GET_REPORT: 525 re = (struct usb_ctl_report *)addr; 526 switch (re->ucr_report) { 527 case UHID_INPUT_REPORT: 528 size = sc->sc_isize; 529 break; 530 case UHID_OUTPUT_REPORT: 531 size = sc->sc_osize; 532 break; 533 case UHID_FEATURE_REPORT: 534 size = sc->sc_fsize; 535 break; 536 default: 537 return (EINVAL); 538 } 539 extra = sc->sc_hdev.sc_report_id != 0; 540 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 541 re->ucr_data, size + extra); 542 if (extra) 543 memcpy(re->ucr_data, re->ucr_data+1, size); 544 if (err) 545 return (EIO); 546 break; 547 548 case USB_SET_REPORT: 549 re = (struct usb_ctl_report *)addr; 550 switch (re->ucr_report) { 551 case UHID_INPUT_REPORT: 552 size = sc->sc_isize; 553 break; 554 case UHID_OUTPUT_REPORT: 555 size = sc->sc_osize; 556 break; 557 case UHID_FEATURE_REPORT: 558 size = sc->sc_fsize; 559 break; 560 default: 561 return (EINVAL); 562 } 563 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 564 re->ucr_data, size); 565 if (err) 566 return (EIO); 567 break; 568 569 case USB_GET_REPORT_ID: 570 *(int *)addr = sc->sc_hdev.sc_report_id; 571 break; 572 573 case USB_GET_DEVICEINFO: 574 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 575 (struct usb_device_info *)addr, 0); 576 break; 577 #ifdef COMPAT_30 578 case USB_GET_DEVICEINFO_OLD: 579 usbd_fill_deviceinfo_old(sc->sc_hdev.sc_parent->sc_udev, 580 (struct usb_device_info_old *)addr, 0); 581 582 break; 583 #endif 584 case USB_GET_STRING_DESC: 585 { 586 struct usb_string_desc *si = (struct usb_string_desc *)addr; 587 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 588 si->usd_string_index, 589 si->usd_language_id, &si->usd_desc, &size); 590 if (err) 591 return (EINVAL); 592 break; 593 } 594 595 default: 596 return (EINVAL); 597 } 598 return (0); 599 } 600 601 int 602 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 603 { 604 struct uhid_softc *sc; 605 int error; 606 607 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 608 609 sc->sc_refcnt++; 610 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 611 if (--sc->sc_refcnt < 0) 612 usb_detach_wakeupold(sc->sc_hdev.sc_dev); 613 return (error); 614 } 615 616 int 617 uhidpoll(dev_t dev, int events, struct lwp *l) 618 { 619 struct uhid_softc *sc; 620 int revents = 0; 621 int s; 622 623 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 624 625 if (sc->sc_dying) 626 return (POLLHUP); 627 628 s = splusb(); 629 if (events & (POLLOUT | POLLWRNORM)) 630 revents |= events & (POLLOUT | POLLWRNORM); 631 if (events & (POLLIN | POLLRDNORM)) { 632 if (sc->sc_q.c_cc > 0) 633 revents |= events & (POLLIN | POLLRDNORM); 634 else 635 selrecord(l, &sc->sc_rsel); 636 } 637 638 splx(s); 639 return (revents); 640 } 641 642 static void 643 filt_uhidrdetach(struct knote *kn) 644 { 645 struct uhid_softc *sc = kn->kn_hook; 646 int s; 647 648 s = splusb(); 649 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 650 splx(s); 651 } 652 653 static int 654 filt_uhidread(struct knote *kn, long hint) 655 { 656 struct uhid_softc *sc = kn->kn_hook; 657 658 kn->kn_data = sc->sc_q.c_cc; 659 return (kn->kn_data > 0); 660 } 661 662 static const struct filterops uhidread_filtops = 663 { 1, NULL, filt_uhidrdetach, filt_uhidread }; 664 665 static const struct filterops uhid_seltrue_filtops = 666 { 1, NULL, filt_uhidrdetach, filt_seltrue }; 667 668 int 669 uhidkqfilter(dev_t dev, struct knote *kn) 670 { 671 struct uhid_softc *sc; 672 struct klist *klist; 673 int s; 674 675 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 676 677 if (sc->sc_dying) 678 return (ENXIO); 679 680 switch (kn->kn_filter) { 681 case EVFILT_READ: 682 klist = &sc->sc_rsel.sel_klist; 683 kn->kn_fop = &uhidread_filtops; 684 break; 685 686 case EVFILT_WRITE: 687 klist = &sc->sc_rsel.sel_klist; 688 kn->kn_fop = &uhid_seltrue_filtops; 689 break; 690 691 default: 692 return (EINVAL); 693 } 694 695 kn->kn_hook = sc; 696 697 s = splusb(); 698 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 699 splx(s); 700 701 return (0); 702 } 703
Indexes created Thu Oct 02 14:10:14 GMT 2025