uhid.c revision 1.84.8.5
1 /* $NetBSD: uhid.c,v 1.84.8.5 2014/05/22 11:40:37 yamt 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 1.84.8.5 2014/05/22 11:40:37 yamt 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/malloc.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_flag = D_OTHER | D_MPSAFE 130 }; 131 132 Static void uhid_intr(struct uhidev *, void *, u_int len); 133 Static void uhid_softintr(void *); 134 135 Static int uhid_do_read(struct uhid_softc *, struct uio *uio, int); 136 Static int uhid_do_write(struct uhid_softc *, struct uio *uio, int); 137 Static int uhid_do_ioctl(struct uhid_softc*, u_long, void *, int, struct lwp *); 138 139 int uhid_match(device_t, cfdata_t, void *); 140 void uhid_attach(device_t, device_t, void *); 141 int uhid_detach(device_t, int); 142 int uhid_activate(device_t, enum devact); 143 extern struct cfdriver uhid_cd; 144 CFATTACH_DECL_NEW(uhid, sizeof(struct uhid_softc), uhid_match, uhid_attach, uhid_detach, uhid_activate); 145 146 int 147 uhid_match(device_t parent, cfdata_t match, void *aux) 148 { 149 #ifdef UHID_DEBUG 150 struct uhidev_attach_arg *uha = aux; 151 #endif 152 153 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 154 155 if (match->cf_flags & 1) 156 return (UMATCH_HIGHEST); 157 else 158 return (UMATCH_IFACECLASS_GENERIC); 159 } 160 161 void 162 uhid_attach(device_t parent, device_t self, void *aux) 163 { 164 struct uhid_softc *sc = device_private(self); 165 struct uhidev_attach_arg *uha = aux; 166 int size, repid; 167 void *desc; 168 169 sc->sc_hdev.sc_dev = self; 170 selinit(&sc->sc_rsel); 171 sc->sc_hdev.sc_intr = uhid_intr; 172 sc->sc_hdev.sc_parent = uha->parent; 173 sc->sc_hdev.sc_report_id = uha->reportid; 174 sc->sc_sih = softint_establish(SOFTINT_MPSAFE | SOFTINT_CLOCK, 175 uhid_softintr, sc); 176 177 uhidev_get_report_desc(uha->parent, &desc, &size); 178 repid = uha->reportid; 179 sc->sc_isize = hid_report_size(desc, size, hid_input, repid); 180 sc->sc_osize = hid_report_size(desc, size, hid_output, repid); 181 sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid); 182 183 aprint_naive("\n"); 184 aprint_normal(": input=%d, output=%d, feature=%d\n", 185 sc->sc_isize, sc->sc_osize, sc->sc_fsize); 186 187 mutex_init(&sc->sc_access_lock, MUTEX_DEFAULT, IPL_NONE); 188 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_USB); 189 cv_init(&sc->sc_cv, "uhidrea"); 190 cv_init(&sc->sc_detach_cv, "uhiddet"); 191 192 if (!pmf_device_register(self, NULL, NULL)) 193 aprint_error_dev(self, "couldn't establish power handler\n"); 194 195 return; 196 } 197 198 int 199 uhid_activate(device_t self, enum devact act) 200 { 201 struct uhid_softc *sc = device_private(self); 202 203 switch (act) { 204 case DVACT_DEACTIVATE: 205 sc->sc_dying = 1; 206 return 0; 207 default: 208 return EOPNOTSUPP; 209 } 210 } 211 212 int 213 uhid_detach(device_t self, int flags) 214 { 215 struct uhid_softc *sc = device_private(self); 216 int maj, mn; 217 218 DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); 219 220 sc->sc_dying = 1; 221 222 mutex_enter(&sc->sc_lock); 223 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 224 if (--sc->sc_refcnt >= 0) { 225 /* Wake everyone */ 226 cv_broadcast(&sc->sc_cv); 227 /* Wait for processes to go away. */ 228 usb_detach_wait(sc->sc_hdev.sc_dev, 229 &sc->sc_detach_cv, &sc->sc_lock); 230 } 231 } 232 mutex_exit(&sc->sc_lock); 233 234 /* locate the major number */ 235 maj = cdevsw_lookup_major(&uhid_cdevsw); 236 237 /* Nuke the vnodes for any open instances (calls close). */ 238 mn = device_unit(self); 239 vdevgone(maj, mn, mn, VCHR); 240 241 #if 0 242 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, 243 sc->sc_hdev.sc_parent->sc_udev, 244 sc->sc_hdev.sc_dev); 245 #endif 246 cv_destroy(&sc->sc_cv); 247 cv_destroy(&sc->sc_detach_cv); 248 mutex_destroy(&sc->sc_lock); 249 mutex_destroy(&sc->sc_access_lock); 250 seldestroy(&sc->sc_rsel); 251 softint_disestablish(sc->sc_sih); 252 253 return (0); 254 } 255 256 void 257 uhid_intr(struct uhidev *addr, void *data, u_int len) 258 { 259 struct uhid_softc *sc = (struct uhid_softc *)addr; 260 261 #ifdef UHID_DEBUG 262 if (uhiddebug > 5) { 263 u_int32_t i; 264 265 DPRINTF(("uhid_intr: data =")); 266 for (i = 0; i < len; i++) 267 DPRINTF((" %02x", ((u_char *)data)[i])); 268 DPRINTF(("\n")); 269 } 270 #endif 271 272 mutex_enter(&sc->sc_lock); 273 (void)b_to_q(data, len, &sc->sc_q); 274 275 if (sc->sc_state & UHID_ASLP) { 276 sc->sc_state &= ~UHID_ASLP; 277 DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); 278 cv_broadcast(&sc->sc_cv); 279 } 280 selnotify(&sc->sc_rsel, 0, 0); 281 if (sc->sc_async != NULL) { 282 DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async)); 283 softint_schedule(sc->sc_sih); 284 } 285 mutex_exit(&sc->sc_lock); 286 } 287 288 void 289 uhid_softintr(void *cookie) 290 { 291 struct uhid_softc *sc; 292 293 sc = cookie; 294 295 mutex_enter(proc_lock); 296 if (sc->sc_async != NULL) 297 psignal(sc->sc_async, SIGIO); 298 mutex_exit(proc_lock); 299 } 300 301 int 302 uhidopen(dev_t dev, int flag, int mode, struct lwp *l) 303 { 304 struct uhid_softc *sc; 305 int error; 306 307 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 308 if (sc == NULL) 309 return ENXIO; 310 311 DPRINTF(("uhidopen: sc=%p\n", sc)); 312 313 if (sc->sc_dying) 314 return (ENXIO); 315 316 mutex_enter(&sc->sc_access_lock); 317 error = uhidev_open(&sc->sc_hdev); 318 if (error) { 319 mutex_exit(&sc->sc_access_lock); 320 return (error); 321 } 322 mutex_exit(&sc->sc_access_lock); 323 324 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 325 mutex_enter(&sc->sc_access_lock); 326 uhidev_close(&sc->sc_hdev); 327 mutex_exit(&sc->sc_access_lock); 328 return (ENOMEM); 329 } 330 sc->sc_obuf = malloc(sc->sc_osize, M_USBDEV, M_WAITOK); 331 sc->sc_state &= ~UHID_IMMED; 332 333 mutex_enter(proc_lock); 334 sc->sc_async = NULL; 335 mutex_exit(proc_lock); 336 337 return (0); 338 } 339 340 int 341 uhidclose(dev_t dev, int flag, int mode, struct lwp *l) 342 { 343 struct uhid_softc *sc; 344 345 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 346 347 DPRINTF(("uhidclose: sc=%p\n", sc)); 348 349 clfree(&sc->sc_q); 350 free(sc->sc_obuf, M_USBDEV); 351 352 mutex_enter(proc_lock); 353 sc->sc_async = NULL; 354 mutex_exit(proc_lock); 355 356 mutex_enter(&sc->sc_access_lock); 357 uhidev_close(&sc->sc_hdev); 358 mutex_exit(&sc->sc_access_lock); 359 360 return (0); 361 } 362 363 int 364 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 365 { 366 int error = 0; 367 int extra; 368 size_t length; 369 u_char buffer[UHID_CHUNK]; 370 usbd_status err; 371 372 DPRINTFN(1, ("uhidread\n")); 373 if (sc->sc_state & UHID_IMMED) { 374 DPRINTFN(1, ("uhidread immed\n")); 375 extra = sc->sc_hdev.sc_report_id != 0; 376 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 377 buffer, sc->sc_isize + extra); 378 if (err) 379 return (EIO); 380 return (uiomove(buffer+extra, sc->sc_isize, uio)); 381 } 382 383 mutex_enter(&sc->sc_lock); 384 while (sc->sc_q.c_cc == 0) { 385 if (flag & IO_NDELAY) { 386 mutex_exit(&sc->sc_lock); 387 return (EWOULDBLOCK); 388 } 389 sc->sc_state |= UHID_ASLP; 390 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 391 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 392 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 393 if (sc->sc_dying) 394 error = EIO; 395 if (error) { 396 sc->sc_state &= ~UHID_ASLP; 397 break; 398 } 399 } 400 mutex_exit(&sc->sc_lock); 401 402 /* Transfer as many chunks as possible. */ 403 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 404 length = min(sc->sc_q.c_cc, uio->uio_resid); 405 if (length > sizeof(buffer)) 406 length = sizeof(buffer); 407 408 /* Remove a small chunk from the input queue. */ 409 (void) q_to_b(&sc->sc_q, buffer, length); 410 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 411 412 /* Copy the data to the user process. */ 413 if ((error = uiomove(buffer, length, uio)) != 0) 414 break; 415 } 416 417 return (error); 418 } 419 420 int 421 uhidread(dev_t dev, struct uio *uio, int flag) 422 { 423 struct uhid_softc *sc; 424 int error; 425 426 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 427 428 mutex_enter(&sc->sc_lock); 429 sc->sc_refcnt++; 430 mutex_exit(&sc->sc_lock); 431 432 mutex_enter(&sc->sc_access_lock); 433 error = uhid_do_read(sc, uio, flag); 434 mutex_exit(&sc->sc_access_lock); 435 436 mutex_enter(&sc->sc_lock); 437 if (--sc->sc_refcnt < 0) 438 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 439 mutex_exit(&sc->sc_lock); 440 return (error); 441 } 442 443 int 444 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 445 { 446 int error; 447 int size; 448 usbd_status err; 449 450 DPRINTFN(1, ("uhidwrite\n")); 451 452 if (sc->sc_dying) 453 return (EIO); 454 455 size = sc->sc_osize; 456 error = 0; 457 if (uio->uio_resid != size) 458 return (EINVAL); 459 error = uiomove(sc->sc_obuf, size, uio); 460 if (!error) { 461 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 462 sc->sc_obuf, size); 463 if (err) 464 error = EIO; 465 } 466 467 return (error); 468 } 469 470 int 471 uhidwrite(dev_t dev, struct uio *uio, int flag) 472 { 473 struct uhid_softc *sc; 474 int error; 475 476 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 477 478 mutex_enter(&sc->sc_lock); 479 sc->sc_refcnt++; 480 mutex_exit(&sc->sc_lock); 481 482 mutex_enter(&sc->sc_access_lock); 483 error = uhid_do_write(sc, uio, flag); 484 mutex_exit(&sc->sc_access_lock); 485 486 mutex_enter(&sc->sc_lock); 487 if (--sc->sc_refcnt < 0) 488 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 489 mutex_exit(&sc->sc_lock); 490 return (error); 491 } 492 493 int 494 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr, 495 int flag, struct lwp *l) 496 { 497 struct usb_ctl_report_desc *rd; 498 struct usb_ctl_report *re; 499 u_char buffer[UHID_CHUNK]; 500 int size, extra; 501 usbd_status err; 502 void *desc; 503 504 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 505 506 if (sc->sc_dying) 507 return (EIO); 508 509 switch (cmd) { 510 case FIONBIO: 511 /* All handled in the upper FS layer. */ 512 break; 513 514 case FIOASYNC: 515 mutex_enter(proc_lock); 516 if (*(int *)addr) { 517 if (sc->sc_async != NULL) 518 return (EBUSY); 519 sc->sc_async = l->l_proc; 520 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 521 } else 522 sc->sc_async = NULL; 523 mutex_exit(proc_lock); 524 break; 525 526 /* XXX this is not the most general solution. */ 527 case TIOCSPGRP: 528 mutex_enter(proc_lock); 529 if (sc->sc_async == NULL) { 530 mutex_exit(proc_lock); 531 return (EINVAL); 532 } 533 if (*(int *)addr != sc->sc_async->p_pgid) { 534 mutex_exit(proc_lock); 535 return (EPERM); 536 } 537 mutex_exit(proc_lock); 538 break; 539 540 case FIOSETOWN: 541 mutex_enter(proc_lock); 542 if (sc->sc_async == NULL) { 543 mutex_exit(proc_lock); 544 return (EINVAL); 545 } 546 if (-*(int *)addr != sc->sc_async->p_pgid 547 && *(int *)addr != sc->sc_async->p_pid) { 548 mutex_exit(proc_lock); 549 return (EPERM); 550 } 551 mutex_exit(proc_lock); 552 break; 553 554 case USB_GET_REPORT_DESC: 555 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 556 rd = (struct usb_ctl_report_desc *)addr; 557 size = min(size, sizeof rd->ucrd_data); 558 rd->ucrd_size = size; 559 memcpy(rd->ucrd_data, desc, size); 560 break; 561 562 case USB_SET_IMMED: 563 if (*(int *)addr) { 564 extra = sc->sc_hdev.sc_report_id != 0; 565 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 566 buffer, sc->sc_isize + extra); 567 if (err) 568 return (EOPNOTSUPP); 569 570 sc->sc_state |= UHID_IMMED; 571 } else 572 sc->sc_state &= ~UHID_IMMED; 573 break; 574 575 case USB_GET_REPORT: 576 re = (struct usb_ctl_report *)addr; 577 switch (re->ucr_report) { 578 case UHID_INPUT_REPORT: 579 size = sc->sc_isize; 580 break; 581 case UHID_OUTPUT_REPORT: 582 size = sc->sc_osize; 583 break; 584 case UHID_FEATURE_REPORT: 585 size = sc->sc_fsize; 586 break; 587 default: 588 return (EINVAL); 589 } 590 extra = sc->sc_hdev.sc_report_id != 0; 591 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 592 re->ucr_data, size + extra); 593 if (extra) 594 memcpy(re->ucr_data, re->ucr_data+1, size); 595 if (err) 596 return (EIO); 597 break; 598 599 case USB_SET_REPORT: 600 re = (struct usb_ctl_report *)addr; 601 switch (re->ucr_report) { 602 case UHID_INPUT_REPORT: 603 size = sc->sc_isize; 604 break; 605 case UHID_OUTPUT_REPORT: 606 size = sc->sc_osize; 607 break; 608 case UHID_FEATURE_REPORT: 609 size = sc->sc_fsize; 610 break; 611 default: 612 return (EINVAL); 613 } 614 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 615 re->ucr_data, size); 616 if (err) 617 return (EIO); 618 break; 619 620 case USB_GET_REPORT_ID: 621 *(int *)addr = sc->sc_hdev.sc_report_id; 622 break; 623 624 case USB_GET_DEVICE_DESC: 625 *(usb_device_descriptor_t *)addr = 626 *usbd_get_device_descriptor(sc->sc_hdev.sc_parent->sc_udev); 627 break; 628 629 case USB_GET_DEVICEINFO: 630 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 631 (struct usb_device_info *)addr, 0); 632 break; 633 #ifdef COMPAT_30 634 case USB_GET_DEVICEINFO_OLD: 635 usbd_fill_deviceinfo_old(sc->sc_hdev.sc_parent->sc_udev, 636 (struct usb_device_info_old *)addr, 0); 637 638 break; 639 #endif 640 case USB_GET_STRING_DESC: 641 { 642 struct usb_string_desc *si = (struct usb_string_desc *)addr; 643 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 644 si->usd_string_index, 645 si->usd_language_id, &si->usd_desc, &size); 646 if (err) 647 return (EINVAL); 648 break; 649 } 650 651 default: 652 return (EINVAL); 653 } 654 return (0); 655 } 656 657 int 658 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 659 { 660 struct uhid_softc *sc; 661 int error; 662 663 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 664 if (sc == NULL) 665 return ENXIO; 666 667 if (sc->sc_dying) 668 return EIO; 669 670 mutex_enter(&sc->sc_lock); 671 sc->sc_refcnt++; 672 mutex_exit(&sc->sc_lock); 673 674 mutex_enter(&sc->sc_access_lock); 675 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 676 mutex_exit(&sc->sc_access_lock); 677 678 mutex_enter(&sc->sc_lock); 679 if (--sc->sc_refcnt < 0) 680 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 681 mutex_exit(&sc->sc_lock); 682 return (error); 683 } 684 685 int 686 uhidpoll(dev_t dev, int events, struct lwp *l) 687 { 688 struct uhid_softc *sc; 689 int revents = 0; 690 691 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 692 if (sc == NULL) 693 return ENXIO; 694 695 if (sc->sc_dying) 696 return EIO; 697 698 mutex_enter(&sc->sc_lock); 699 if (events & (POLLOUT | POLLWRNORM)) 700 revents |= events & (POLLOUT | POLLWRNORM); 701 if (events & (POLLIN | POLLRDNORM)) { 702 if (sc->sc_q.c_cc > 0) 703 revents |= events & (POLLIN | POLLRDNORM); 704 else 705 selrecord(l, &sc->sc_rsel); 706 } 707 mutex_exit(&sc->sc_lock); 708 709 return (revents); 710 } 711 712 static void 713 filt_uhidrdetach(struct knote *kn) 714 { 715 struct uhid_softc *sc = kn->kn_hook; 716 717 mutex_enter(&sc->sc_lock); 718 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 719 mutex_exit(&sc->sc_lock); 720 } 721 722 static int 723 filt_uhidread(struct knote *kn, long hint) 724 { 725 struct uhid_softc *sc = kn->kn_hook; 726 727 kn->kn_data = sc->sc_q.c_cc; 728 return (kn->kn_data > 0); 729 } 730 731 static const struct filterops uhidread_filtops = 732 { 1, NULL, filt_uhidrdetach, filt_uhidread }; 733 734 static const struct filterops uhid_seltrue_filtops = 735 { 1, NULL, filt_uhidrdetach, filt_seltrue }; 736 737 int 738 uhidkqfilter(dev_t dev, struct knote *kn) 739 { 740 struct uhid_softc *sc; 741 struct klist *klist; 742 743 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 744 745 if (sc->sc_dying) 746 return (ENXIO); 747 748 switch (kn->kn_filter) { 749 case EVFILT_READ: 750 klist = &sc->sc_rsel.sel_klist; 751 kn->kn_fop = &uhidread_filtops; 752 break; 753 754 case EVFILT_WRITE: 755 klist = &sc->sc_rsel.sel_klist; 756 kn->kn_fop = &uhid_seltrue_filtops; 757 break; 758 759 default: 760 return (EINVAL); 761 } 762 763 kn->kn_hook = sc; 764 765 mutex_enter(&sc->sc_lock); 766 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 767 mutex_exit(&sc->sc_lock); 768 769 return (0); 770 } 771
Indexes created Thu Oct 02 14:10:14 GMT 2025