uhid.c revision 1.92.4.4
1 /* $NetBSD: uhid.c,v 1.92.4.4 2014/12/05 09:37:49 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 1998, 2004, 2008, 2012 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 and Matthew R. Green (mrg (at) eterna.com.au). 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 1.92.4.4 2014/12/05 09:37:49 skrll Exp $"); 39 40 #ifdef _KERNEL_OPT 41 #include "opt_compat_netbsd.h" 42 #endif 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/kmem.h> 48 #include <sys/signalvar.h> 49 #include <sys/device.h> 50 #include <sys/ioctl.h> 51 #include <sys/conf.h> 52 #include <sys/tty.h> 53 #include <sys/file.h> 54 #include <sys/select.h> 55 #include <sys/proc.h> 56 #include <sys/vnode.h> 57 #include <sys/poll.h> 58 #include <sys/intr.h> 59 60 #include <dev/usb/usb.h> 61 #include <dev/usb/usbhid.h> 62 63 #include <dev/usb/usbdevs.h> 64 #include <dev/usb/usbdi.h> 65 #include <dev/usb/usbdi_util.h> 66 #include <dev/usb/hid.h> 67 #include <dev/usb/usb_quirks.h> 68 69 #include <dev/usb/uhidev.h> 70 71 #ifdef UHID_DEBUG 72 #define DPRINTF(x) if (uhiddebug) printf x 73 #define DPRINTFN(n,x) if (uhiddebug>(n)) printf x 74 int uhiddebug = 0; 75 #else 76 #define DPRINTF(x) 77 #define DPRINTFN(n,x) 78 #endif 79 80 struct uhid_softc { 81 struct uhidev sc_hdev; 82 83 kmutex_t sc_access_lock; /* serialises syscall accesses */ 84 kmutex_t sc_lock; /* protects refcnt, others */ 85 kcondvar_t sc_cv; 86 kcondvar_t sc_detach_cv; 87 88 int sc_isize; 89 int sc_osize; 90 int sc_fsize; 91 92 u_char *sc_obuf; 93 94 struct clist sc_q; 95 struct selinfo sc_rsel; 96 proc_t *sc_async; /* process that wants SIGIO */ 97 void *sc_sih; 98 u_char sc_state; /* driver state */ 99 #define UHID_ASLP 0x01 /* waiting for device data */ 100 #define UHID_IMMED 0x02 /* return read data immediately */ 101 102 int sc_refcnt; 103 u_char sc_dying; 104 }; 105 106 #define UHIDUNIT(dev) (minor(dev)) 107 #define UHID_CHUNK 128 /* chunk size for read */ 108 #define UHID_BSIZE 1020 /* buffer size */ 109 110 dev_type_open(uhidopen); 111 dev_type_close(uhidclose); 112 dev_type_read(uhidread); 113 dev_type_write(uhidwrite); 114 dev_type_ioctl(uhidioctl); 115 dev_type_poll(uhidpoll); 116 dev_type_kqfilter(uhidkqfilter); 117 118 const struct cdevsw uhid_cdevsw = { 119 .d_open = uhidopen, 120 .d_close = uhidclose, 121 .d_read = uhidread, 122 .d_write = uhidwrite, 123 .d_ioctl = uhidioctl, 124 .d_stop = nostop, 125 .d_tty = notty, 126 .d_poll = uhidpoll, 127 .d_mmap = nommap, 128 .d_kqfilter = uhidkqfilter, 129 .d_discard = nodiscard, 130 .d_flag = D_OTHER | D_MPSAFE 131 }; 132 133 Static void uhid_intr(struct uhidev *, void *, u_int len); 134 Static void uhid_softintr(void *); 135 136 Static int uhid_do_read(struct uhid_softc *, struct uio *uio, int); 137 Static int uhid_do_write(struct uhid_softc *, struct uio *uio, int); 138 Static int uhid_do_ioctl(struct uhid_softc*, u_long, void *, int, struct lwp *); 139 140 int uhid_match(device_t, cfdata_t, void *); 141 void uhid_attach(device_t, device_t, void *); 142 int uhid_detach(device_t, int); 143 int uhid_activate(device_t, enum devact); 144 extern struct cfdriver uhid_cd; 145 CFATTACH_DECL_NEW(uhid, sizeof(struct uhid_softc), uhid_match, uhid_attach, uhid_detach, uhid_activate); 146 147 int 148 uhid_match(device_t parent, cfdata_t match, void *aux) 149 { 150 #ifdef UHID_DEBUG 151 struct uhidev_attach_arg *uha = aux; 152 #endif 153 154 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 155 156 if (match->cf_flags & 1) 157 return UMATCH_HIGHEST; 158 else 159 return UMATCH_IFACECLASS_GENERIC; 160 } 161 162 void 163 uhid_attach(device_t parent, device_t self, void *aux) 164 { 165 struct uhid_softc *sc = device_private(self); 166 struct uhidev_attach_arg *uha = aux; 167 int size, repid; 168 void *desc; 169 170 sc->sc_hdev.sc_dev = self; 171 selinit(&sc->sc_rsel); 172 sc->sc_hdev.sc_intr = uhid_intr; 173 sc->sc_hdev.sc_parent = uha->parent; 174 sc->sc_hdev.sc_report_id = uha->reportid; 175 sc->sc_sih = softint_establish(SOFTINT_MPSAFE | SOFTINT_CLOCK, 176 uhid_softintr, sc); 177 178 uhidev_get_report_desc(uha->parent, &desc, &size); 179 repid = uha->reportid; 180 sc->sc_isize = hid_report_size(desc, size, hid_input, repid); 181 sc->sc_osize = hid_report_size(desc, size, hid_output, repid); 182 sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid); 183 184 aprint_naive("\n"); 185 aprint_normal(": input=%d, output=%d, feature=%d\n", 186 sc->sc_isize, sc->sc_osize, sc->sc_fsize); 187 188 mutex_init(&sc->sc_access_lock, MUTEX_DEFAULT, IPL_NONE); 189 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_USB); 190 cv_init(&sc->sc_cv, "uhidrea"); 191 cv_init(&sc->sc_detach_cv, "uhiddet"); 192 193 if (!pmf_device_register(self, NULL, NULL)) 194 aprint_error_dev(self, "couldn't establish power handler\n"); 195 196 return; 197 } 198 199 int 200 uhid_activate(device_t self, enum devact act) 201 { 202 struct uhid_softc *sc = device_private(self); 203 204 switch (act) { 205 case DVACT_DEACTIVATE: 206 sc->sc_dying = 1; 207 return 0; 208 default: 209 return EOPNOTSUPP; 210 } 211 } 212 213 int 214 uhid_detach(device_t self, int flags) 215 { 216 struct uhid_softc *sc = device_private(self); 217 int maj, mn; 218 219 DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); 220 221 sc->sc_dying = 1; 222 223 pmf_device_deregister(self); 224 225 mutex_enter(&sc->sc_lock); 226 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 227 if (--sc->sc_refcnt >= 0) { 228 /* Wake everyone */ 229 cv_broadcast(&sc->sc_cv); 230 /* Wait for processes to go away. */ 231 usb_detach_wait(sc->sc_hdev.sc_dev, 232 &sc->sc_detach_cv, &sc->sc_lock); 233 } 234 } 235 mutex_exit(&sc->sc_lock); 236 237 /* locate the major number */ 238 maj = cdevsw_lookup_major(&uhid_cdevsw); 239 240 /* Nuke the vnodes for any open instances (calls close). */ 241 mn = device_unit(self); 242 vdevgone(maj, mn, mn, VCHR); 243 244 #if 0 245 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, 246 sc->sc_hdev.sc_parent->sc_udev, 247 sc->sc_hdev.sc_dev); 248 #endif 249 cv_destroy(&sc->sc_cv); 250 cv_destroy(&sc->sc_detach_cv); 251 mutex_destroy(&sc->sc_lock); 252 mutex_destroy(&sc->sc_access_lock); 253 seldestroy(&sc->sc_rsel); 254 softint_disestablish(sc->sc_sih); 255 256 return 0; 257 } 258 259 void 260 uhid_intr(struct uhidev *addr, void *data, u_int len) 261 { 262 struct uhid_softc *sc = (struct uhid_softc *)addr; 263 264 #ifdef UHID_DEBUG 265 if (uhiddebug > 5) { 266 uint32_t i; 267 268 DPRINTF(("uhid_intr: data =")); 269 for (i = 0; i < len; i++) 270 DPRINTF((" %02x", ((u_char *)data)[i])); 271 DPRINTF(("\n")); 272 } 273 #endif 274 275 mutex_enter(&sc->sc_lock); 276 (void)b_to_q(data, len, &sc->sc_q); 277 278 if (sc->sc_state & UHID_ASLP) { 279 sc->sc_state &= ~UHID_ASLP; 280 DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); 281 cv_broadcast(&sc->sc_cv); 282 } 283 selnotify(&sc->sc_rsel, 0, 0); 284 if (sc->sc_async != NULL) { 285 DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async)); 286 softint_schedule(sc->sc_sih); 287 } 288 mutex_exit(&sc->sc_lock); 289 } 290 291 void 292 uhid_softintr(void *cookie) 293 { 294 struct uhid_softc *sc; 295 296 sc = cookie; 297 298 mutex_enter(proc_lock); 299 if (sc->sc_async != NULL) 300 psignal(sc->sc_async, SIGIO); 301 mutex_exit(proc_lock); 302 } 303 304 int 305 uhidopen(dev_t dev, int flag, int mode, struct lwp *l) 306 { 307 struct uhid_softc *sc; 308 int error; 309 310 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 311 if (sc == NULL) 312 return ENXIO; 313 314 DPRINTF(("uhidopen: sc=%p\n", sc)); 315 316 if (sc->sc_dying) 317 return ENXIO; 318 319 mutex_enter(&sc->sc_access_lock); 320 error = uhidev_open(&sc->sc_hdev); 321 if (error) { 322 mutex_exit(&sc->sc_access_lock); 323 return error; 324 } 325 mutex_exit(&sc->sc_access_lock); 326 327 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 328 mutex_enter(&sc->sc_access_lock); 329 uhidev_close(&sc->sc_hdev); 330 mutex_exit(&sc->sc_access_lock); 331 return ENOMEM; 332 } 333 sc->sc_obuf = kmem_alloc(sc->sc_osize, KM_SLEEP); 334 sc->sc_state &= ~UHID_IMMED; 335 336 mutex_enter(proc_lock); 337 sc->sc_async = NULL; 338 mutex_exit(proc_lock); 339 340 return 0; 341 } 342 343 int 344 uhidclose(dev_t dev, int flag, int mode, struct lwp *l) 345 { 346 struct uhid_softc *sc; 347 348 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 349 350 DPRINTF(("uhidclose: sc=%p\n", sc)); 351 352 clfree(&sc->sc_q); 353 kmem_free(sc->sc_obuf, sc->sc_osize); 354 355 mutex_enter(proc_lock); 356 sc->sc_async = NULL; 357 mutex_exit(proc_lock); 358 359 mutex_enter(&sc->sc_access_lock); 360 uhidev_close(&sc->sc_hdev); 361 mutex_exit(&sc->sc_access_lock); 362 363 return 0; 364 } 365 366 int 367 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 368 { 369 int error = 0; 370 int extra; 371 size_t length; 372 u_char buffer[UHID_CHUNK]; 373 usbd_status err; 374 375 DPRINTFN(1, ("uhidread\n")); 376 if (sc->sc_state & UHID_IMMED) { 377 DPRINTFN(1, ("uhidread immed\n")); 378 extra = sc->sc_hdev.sc_report_id != 0; 379 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 380 buffer, sc->sc_isize + extra); 381 if (err) 382 return EIO; 383 return uiomove(buffer+extra, sc->sc_isize, uio); 384 } 385 386 mutex_enter(&sc->sc_lock); 387 while (sc->sc_q.c_cc == 0) { 388 if (flag & IO_NDELAY) { 389 mutex_exit(&sc->sc_lock); 390 return EWOULDBLOCK; 391 } 392 sc->sc_state |= UHID_ASLP; 393 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 394 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 395 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 396 if (sc->sc_dying) 397 error = EIO; 398 if (error) { 399 sc->sc_state &= ~UHID_ASLP; 400 break; 401 } 402 } 403 mutex_exit(&sc->sc_lock); 404 405 /* Transfer as many chunks as possible. */ 406 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 407 length = min(sc->sc_q.c_cc, uio->uio_resid); 408 if (length > sizeof(buffer)) 409 length = sizeof(buffer); 410 411 /* Remove a small chunk from the input queue. */ 412 (void) q_to_b(&sc->sc_q, buffer, length); 413 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 414 415 /* Copy the data to the user process. */ 416 if ((error = uiomove(buffer, length, uio)) != 0) 417 break; 418 } 419 420 return error; 421 } 422 423 int 424 uhidread(dev_t dev, struct uio *uio, int flag) 425 { 426 struct uhid_softc *sc; 427 int error; 428 429 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 430 431 mutex_enter(&sc->sc_lock); 432 sc->sc_refcnt++; 433 mutex_exit(&sc->sc_lock); 434 435 mutex_enter(&sc->sc_access_lock); 436 error = uhid_do_read(sc, uio, flag); 437 mutex_exit(&sc->sc_access_lock); 438 439 mutex_enter(&sc->sc_lock); 440 if (--sc->sc_refcnt < 0) 441 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 442 mutex_exit(&sc->sc_lock); 443 return error; 444 } 445 446 int 447 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 448 { 449 int error; 450 int size; 451 usbd_status err; 452 453 DPRINTFN(1, ("uhidwrite\n")); 454 455 if (sc->sc_dying) 456 return EIO; 457 458 size = sc->sc_osize; 459 error = 0; 460 if (uio->uio_resid != size) 461 return EINVAL; 462 error = uiomove(sc->sc_obuf, size, uio); 463 if (!error) { 464 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 465 sc->sc_obuf, size); 466 if (err) 467 error = EIO; 468 } 469 470 return error; 471 } 472 473 int 474 uhidwrite(dev_t dev, struct uio *uio, int flag) 475 { 476 struct uhid_softc *sc; 477 int error; 478 479 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 480 481 mutex_enter(&sc->sc_lock); 482 sc->sc_refcnt++; 483 mutex_exit(&sc->sc_lock); 484 485 mutex_enter(&sc->sc_access_lock); 486 error = uhid_do_write(sc, uio, flag); 487 mutex_exit(&sc->sc_access_lock); 488 489 mutex_enter(&sc->sc_lock); 490 if (--sc->sc_refcnt < 0) 491 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 492 mutex_exit(&sc->sc_lock); 493 return error; 494 } 495 496 int 497 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr, 498 int flag, struct lwp *l) 499 { 500 struct usb_ctl_report_desc *rd; 501 struct usb_ctl_report *re; 502 u_char buffer[UHID_CHUNK]; 503 int size, extra; 504 usbd_status err; 505 void *desc; 506 507 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 508 509 if (sc->sc_dying) 510 return EIO; 511 512 switch (cmd) { 513 case FIONBIO: 514 /* All handled in the upper FS layer. */ 515 break; 516 517 case FIOASYNC: 518 mutex_enter(proc_lock); 519 if (*(int *)addr) { 520 if (sc->sc_async != NULL) 521 return EBUSY; 522 sc->sc_async = l->l_proc; 523 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 524 } else 525 sc->sc_async = NULL; 526 mutex_exit(proc_lock); 527 break; 528 529 /* XXX this is not the most general solution. */ 530 case TIOCSPGRP: 531 mutex_enter(proc_lock); 532 if (sc->sc_async == NULL) { 533 mutex_exit(proc_lock); 534 return EINVAL; 535 } 536 if (*(int *)addr != sc->sc_async->p_pgid) { 537 mutex_exit(proc_lock); 538 return EPERM; 539 } 540 mutex_exit(proc_lock); 541 break; 542 543 case FIOSETOWN: 544 mutex_enter(proc_lock); 545 if (sc->sc_async == NULL) { 546 mutex_exit(proc_lock); 547 return EINVAL; 548 } 549 if (-*(int *)addr != sc->sc_async->p_pgid 550 && *(int *)addr != sc->sc_async->p_pid) { 551 mutex_exit(proc_lock); 552 return EPERM; 553 } 554 mutex_exit(proc_lock); 555 break; 556 557 case USB_GET_REPORT_DESC: 558 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 559 rd = (struct usb_ctl_report_desc *)addr; 560 size = min(size, sizeof rd->ucrd_data); 561 rd->ucrd_size = size; 562 memcpy(rd->ucrd_data, desc, size); 563 break; 564 565 case USB_SET_IMMED: 566 if (*(int *)addr) { 567 extra = sc->sc_hdev.sc_report_id != 0; 568 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 569 buffer, sc->sc_isize + extra); 570 if (err) 571 return EOPNOTSUPP; 572 573 sc->sc_state |= UHID_IMMED; 574 } else 575 sc->sc_state &= ~UHID_IMMED; 576 break; 577 578 case USB_GET_REPORT: 579 re = (struct usb_ctl_report *)addr; 580 switch (re->ucr_report) { 581 case UHID_INPUT_REPORT: 582 size = sc->sc_isize; 583 break; 584 case UHID_OUTPUT_REPORT: 585 size = sc->sc_osize; 586 break; 587 case UHID_FEATURE_REPORT: 588 size = sc->sc_fsize; 589 break; 590 default: 591 return EINVAL; 592 } 593 extra = sc->sc_hdev.sc_report_id != 0; 594 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 595 re->ucr_data, size + extra); 596 if (extra) 597 memcpy(re->ucr_data, re->ucr_data+1, size); 598 if (err) 599 return EIO; 600 break; 601 602 case USB_SET_REPORT: 603 re = (struct usb_ctl_report *)addr; 604 switch (re->ucr_report) { 605 case UHID_INPUT_REPORT: 606 size = sc->sc_isize; 607 break; 608 case UHID_OUTPUT_REPORT: 609 size = sc->sc_osize; 610 break; 611 case UHID_FEATURE_REPORT: 612 size = sc->sc_fsize; 613 break; 614 default: 615 return EINVAL; 616 } 617 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 618 re->ucr_data, size); 619 if (err) 620 return EIO; 621 break; 622 623 case USB_GET_REPORT_ID: 624 *(int *)addr = sc->sc_hdev.sc_report_id; 625 break; 626 627 case USB_GET_DEVICE_DESC: 628 *(usb_device_descriptor_t *)addr = 629 *usbd_get_device_descriptor(sc->sc_hdev.sc_parent->sc_udev); 630 break; 631 632 case USB_GET_DEVICEINFO: 633 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 634 (struct usb_device_info *)addr, 0); 635 break; 636 #ifdef COMPAT_30 637 case USB_GET_DEVICEINFO_OLD: 638 usbd_fill_deviceinfo_old(sc->sc_hdev.sc_parent->sc_udev, 639 (struct usb_device_info_old *)addr, 0); 640 641 break; 642 #endif 643 case USB_GET_STRING_DESC: 644 { 645 struct usb_string_desc *si = (struct usb_string_desc *)addr; 646 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 647 si->usd_string_index, 648 si->usd_language_id, &si->usd_desc, &size); 649 if (err) 650 return EINVAL; 651 break; 652 } 653 654 default: 655 return EINVAL; 656 } 657 return 0; 658 } 659 660 int 661 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 662 { 663 struct uhid_softc *sc; 664 int error; 665 666 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 667 if (sc == NULL) 668 return ENXIO; 669 670 if (sc->sc_dying) 671 return EIO; 672 673 mutex_enter(&sc->sc_lock); 674 sc->sc_refcnt++; 675 mutex_exit(&sc->sc_lock); 676 677 mutex_enter(&sc->sc_access_lock); 678 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 679 mutex_exit(&sc->sc_access_lock); 680 681 mutex_enter(&sc->sc_lock); 682 if (--sc->sc_refcnt < 0) 683 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 684 mutex_exit(&sc->sc_lock); 685 return error; 686 } 687 688 int 689 uhidpoll(dev_t dev, int events, struct lwp *l) 690 { 691 struct uhid_softc *sc; 692 int revents = 0; 693 694 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 695 if (sc == NULL) 696 return ENXIO; 697 698 if (sc->sc_dying) 699 return EIO; 700 701 mutex_enter(&sc->sc_lock); 702 if (events & (POLLOUT | POLLWRNORM)) 703 revents |= events & (POLLOUT | POLLWRNORM); 704 if (events & (POLLIN | POLLRDNORM)) { 705 if (sc->sc_q.c_cc > 0) 706 revents |= events & (POLLIN | POLLRDNORM); 707 else 708 selrecord(l, &sc->sc_rsel); 709 } 710 mutex_exit(&sc->sc_lock); 711 712 return revents; 713 } 714 715 static void 716 filt_uhidrdetach(struct knote *kn) 717 { 718 struct uhid_softc *sc = kn->kn_hook; 719 720 mutex_enter(&sc->sc_lock); 721 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 722 mutex_exit(&sc->sc_lock); 723 } 724 725 static int 726 filt_uhidread(struct knote *kn, long hint) 727 { 728 struct uhid_softc *sc = kn->kn_hook; 729 730 kn->kn_data = sc->sc_q.c_cc; 731 return kn->kn_data > 0; 732 } 733 734 static const struct filterops uhidread_filtops = 735 { 1, NULL, filt_uhidrdetach, filt_uhidread }; 736 737 static const struct filterops uhid_seltrue_filtops = 738 { 1, NULL, filt_uhidrdetach, filt_seltrue }; 739 740 int 741 uhidkqfilter(dev_t dev, struct knote *kn) 742 { 743 struct uhid_softc *sc; 744 struct klist *klist; 745 746 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 747 748 if (sc->sc_dying) 749 return ENXIO; 750 751 switch (kn->kn_filter) { 752 case EVFILT_READ: 753 klist = &sc->sc_rsel.sel_klist; 754 kn->kn_fop = &uhidread_filtops; 755 break; 756 757 case EVFILT_WRITE: 758 klist = &sc->sc_rsel.sel_klist; 759 kn->kn_fop = &uhid_seltrue_filtops; 760 break; 761 762 default: 763 return EINVAL; 764 } 765 766 kn->kn_hook = sc; 767 768 mutex_enter(&sc->sc_lock); 769 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 770 mutex_exit(&sc->sc_lock); 771 772 return 0; 773 } 774
Indexes created Thu Oct 02 14:10:14 GMT 2025