uhid.c revision 1.89
1 /* $NetBSD: uhid.c,v 1.89 2013/01/05 01:30:17 christos 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 1.89 2013/01/05 01:30:17 christos 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 uhidopen, uhidclose, uhidread, uhidwrite, uhidioctl, 120 nostop, notty, uhidpoll, nommap, uhidkqfilter, D_OTHER | D_MPSAFE, 121 }; 122 123 Static void uhid_intr(struct uhidev *, void *, u_int len); 124 Static void uhid_softintr(void *); 125 126 Static int uhid_do_read(struct uhid_softc *, struct uio *uio, int); 127 Static int uhid_do_write(struct uhid_softc *, struct uio *uio, int); 128 Static int uhid_do_ioctl(struct uhid_softc*, u_long, void *, int, struct lwp *); 129 130 int uhid_match(device_t, cfdata_t, void *); 131 void uhid_attach(device_t, device_t, void *); 132 int uhid_detach(device_t, int); 133 int uhid_activate(device_t, enum devact); 134 extern struct cfdriver uhid_cd; 135 CFATTACH_DECL_NEW(uhid, sizeof(struct uhid_softc), uhid_match, uhid_attach, uhid_detach, uhid_activate); 136 137 int 138 uhid_match(device_t parent, cfdata_t match, void *aux) 139 { 140 #ifdef UHID_DEBUG 141 struct uhidev_attach_arg *uha = aux; 142 #endif 143 144 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 145 146 if (match->cf_flags & 1) 147 return (UMATCH_HIGHEST); 148 else 149 return (UMATCH_IFACECLASS_GENERIC); 150 } 151 152 void 153 uhid_attach(device_t parent, device_t self, void *aux) 154 { 155 struct uhid_softc *sc = device_private(self); 156 struct uhidev_attach_arg *uha = aux; 157 int size, repid; 158 void *desc; 159 160 sc->sc_hdev.sc_dev = self; 161 selinit(&sc->sc_rsel); 162 sc->sc_hdev.sc_intr = uhid_intr; 163 sc->sc_hdev.sc_parent = uha->parent; 164 sc->sc_hdev.sc_report_id = uha->reportid; 165 sc->sc_sih = softint_establish(SOFTINT_MPSAFE | SOFTINT_CLOCK, 166 uhid_softintr, sc); 167 168 uhidev_get_report_desc(uha->parent, &desc, &size); 169 repid = uha->reportid; 170 sc->sc_isize = hid_report_size(desc, size, hid_input, repid); 171 sc->sc_osize = hid_report_size(desc, size, hid_output, repid); 172 sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid); 173 174 aprint_naive("\n"); 175 aprint_normal(": input=%d, output=%d, feature=%d\n", 176 sc->sc_isize, sc->sc_osize, sc->sc_fsize); 177 178 mutex_init(&sc->sc_access_lock, MUTEX_DEFAULT, IPL_NONE); 179 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_USB); 180 cv_init(&sc->sc_cv, "uhidrea"); 181 cv_init(&sc->sc_detach_cv, "uhiddet"); 182 183 if (!pmf_device_register(self, NULL, NULL)) 184 aprint_error_dev(self, "couldn't establish power handler\n"); 185 186 return; 187 } 188 189 int 190 uhid_activate(device_t self, enum devact act) 191 { 192 struct uhid_softc *sc = device_private(self); 193 194 switch (act) { 195 case DVACT_DEACTIVATE: 196 sc->sc_dying = 1; 197 return 0; 198 default: 199 return EOPNOTSUPP; 200 } 201 } 202 203 int 204 uhid_detach(device_t self, int flags) 205 { 206 struct uhid_softc *sc = device_private(self); 207 int maj, mn; 208 209 DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); 210 211 sc->sc_dying = 1; 212 213 mutex_enter(&sc->sc_lock); 214 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 215 if (--sc->sc_refcnt >= 0) { 216 /* Wake everyone */ 217 cv_broadcast(&sc->sc_cv); 218 /* Wait for processes to go away. */ 219 usb_detach_wait(sc->sc_hdev.sc_dev, 220 &sc->sc_detach_cv, &sc->sc_lock); 221 } 222 } 223 mutex_exit(&sc->sc_lock); 224 225 /* locate the major number */ 226 maj = cdevsw_lookup_major(&uhid_cdevsw); 227 228 /* Nuke the vnodes for any open instances (calls close). */ 229 mn = device_unit(self); 230 vdevgone(maj, mn, mn, VCHR); 231 232 #if 0 233 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, 234 sc->sc_hdev.sc_parent->sc_udev, 235 sc->sc_hdev.sc_dev); 236 #endif 237 cv_destroy(&sc->sc_cv); 238 cv_destroy(&sc->sc_detach_cv); 239 mutex_destroy(&sc->sc_lock); 240 mutex_destroy(&sc->sc_access_lock); 241 seldestroy(&sc->sc_rsel); 242 softint_disestablish(sc->sc_sih); 243 244 return (0); 245 } 246 247 void 248 uhid_intr(struct uhidev *addr, void *data, u_int len) 249 { 250 struct uhid_softc *sc = (struct uhid_softc *)addr; 251 252 #ifdef UHID_DEBUG 253 if (uhiddebug > 5) { 254 u_int32_t i; 255 256 DPRINTF(("uhid_intr: data =")); 257 for (i = 0; i < len; i++) 258 DPRINTF((" %02x", ((u_char *)data)[i])); 259 DPRINTF(("\n")); 260 } 261 #endif 262 263 mutex_enter(&sc->sc_lock); 264 (void)b_to_q(data, len, &sc->sc_q); 265 266 if (sc->sc_state & UHID_ASLP) { 267 sc->sc_state &= ~UHID_ASLP; 268 DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); 269 cv_broadcast(&sc->sc_cv); 270 } 271 selnotify(&sc->sc_rsel, 0, 0); 272 if (sc->sc_async != NULL) { 273 DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async)); 274 softint_schedule(sc->sc_sih); 275 } 276 mutex_exit(&sc->sc_lock); 277 } 278 279 void 280 uhid_softintr(void *cookie) 281 { 282 struct uhid_softc *sc; 283 284 sc = cookie; 285 286 mutex_enter(proc_lock); 287 if (sc->sc_async != NULL) 288 psignal(sc->sc_async, SIGIO); 289 mutex_exit(proc_lock); 290 } 291 292 int 293 uhidopen(dev_t dev, int flag, int mode, struct lwp *l) 294 { 295 struct uhid_softc *sc; 296 int error; 297 298 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 299 if (sc == NULL) 300 return ENXIO; 301 302 DPRINTF(("uhidopen: sc=%p\n", sc)); 303 304 if (sc->sc_dying) 305 return (ENXIO); 306 307 mutex_enter(&sc->sc_access_lock); 308 error = uhidev_open(&sc->sc_hdev); 309 if (error) { 310 mutex_exit(&sc->sc_access_lock); 311 return (error); 312 } 313 mutex_exit(&sc->sc_access_lock); 314 315 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 316 mutex_enter(&sc->sc_access_lock); 317 uhidev_close(&sc->sc_hdev); 318 mutex_exit(&sc->sc_access_lock); 319 return (ENOMEM); 320 } 321 sc->sc_obuf = malloc(sc->sc_osize, M_USBDEV, M_WAITOK); 322 sc->sc_state &= ~UHID_IMMED; 323 324 mutex_enter(proc_lock); 325 sc->sc_async = NULL; 326 mutex_exit(proc_lock); 327 328 return (0); 329 } 330 331 int 332 uhidclose(dev_t dev, int flag, int mode, struct lwp *l) 333 { 334 struct uhid_softc *sc; 335 336 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 337 338 DPRINTF(("uhidclose: sc=%p\n", sc)); 339 340 clfree(&sc->sc_q); 341 free(sc->sc_obuf, M_USBDEV); 342 343 mutex_enter(proc_lock); 344 sc->sc_async = NULL; 345 mutex_exit(proc_lock); 346 347 mutex_enter(&sc->sc_access_lock); 348 uhidev_close(&sc->sc_hdev); 349 mutex_exit(&sc->sc_access_lock); 350 351 return (0); 352 } 353 354 int 355 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 356 { 357 int error = 0; 358 int extra; 359 size_t length; 360 u_char buffer[UHID_CHUNK]; 361 usbd_status err; 362 363 DPRINTFN(1, ("uhidread\n")); 364 if (sc->sc_state & UHID_IMMED) { 365 DPRINTFN(1, ("uhidread immed\n")); 366 extra = sc->sc_hdev.sc_report_id != 0; 367 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 368 buffer, sc->sc_isize + extra); 369 if (err) 370 return (EIO); 371 return (uiomove(buffer+extra, sc->sc_isize, uio)); 372 } 373 374 mutex_enter(&sc->sc_lock); 375 while (sc->sc_q.c_cc == 0) { 376 if (flag & IO_NDELAY) { 377 mutex_exit(&sc->sc_lock); 378 return (EWOULDBLOCK); 379 } 380 sc->sc_state |= UHID_ASLP; 381 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 382 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 383 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 384 if (sc->sc_dying) 385 error = EIO; 386 if (error) { 387 sc->sc_state &= ~UHID_ASLP; 388 break; 389 } 390 } 391 mutex_exit(&sc->sc_lock); 392 393 /* Transfer as many chunks as possible. */ 394 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 395 length = min(sc->sc_q.c_cc, uio->uio_resid); 396 if (length > sizeof(buffer)) 397 length = sizeof(buffer); 398 399 /* Remove a small chunk from the input queue. */ 400 (void) q_to_b(&sc->sc_q, buffer, length); 401 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 402 403 /* Copy the data to the user process. */ 404 if ((error = uiomove(buffer, length, uio)) != 0) 405 break; 406 } 407 408 return (error); 409 } 410 411 int 412 uhidread(dev_t dev, struct uio *uio, int flag) 413 { 414 struct uhid_softc *sc; 415 int error; 416 417 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 418 419 mutex_enter(&sc->sc_lock); 420 sc->sc_refcnt++; 421 mutex_exit(&sc->sc_lock); 422 423 mutex_enter(&sc->sc_access_lock); 424 error = uhid_do_read(sc, uio, flag); 425 mutex_exit(&sc->sc_access_lock); 426 427 mutex_enter(&sc->sc_lock); 428 if (--sc->sc_refcnt < 0) 429 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 430 mutex_exit(&sc->sc_lock); 431 return (error); 432 } 433 434 int 435 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 436 { 437 int error; 438 int size; 439 usbd_status err; 440 441 DPRINTFN(1, ("uhidwrite\n")); 442 443 if (sc->sc_dying) 444 return (EIO); 445 446 size = sc->sc_osize; 447 error = 0; 448 if (uio->uio_resid != size) 449 return (EINVAL); 450 error = uiomove(sc->sc_obuf, size, uio); 451 if (!error) { 452 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 453 sc->sc_obuf, size); 454 if (err) 455 error = EIO; 456 } 457 458 return (error); 459 } 460 461 int 462 uhidwrite(dev_t dev, struct uio *uio, int flag) 463 { 464 struct uhid_softc *sc; 465 int error; 466 467 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 468 469 mutex_enter(&sc->sc_lock); 470 sc->sc_refcnt++; 471 mutex_exit(&sc->sc_lock); 472 473 mutex_enter(&sc->sc_access_lock); 474 error = uhid_do_write(sc, uio, flag); 475 mutex_exit(&sc->sc_access_lock); 476 477 mutex_enter(&sc->sc_lock); 478 if (--sc->sc_refcnt < 0) 479 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 480 mutex_exit(&sc->sc_lock); 481 return (error); 482 } 483 484 int 485 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr, 486 int flag, struct lwp *l) 487 { 488 struct usb_ctl_report_desc *rd; 489 struct usb_ctl_report *re; 490 u_char buffer[UHID_CHUNK]; 491 int size, extra; 492 usbd_status err; 493 void *desc; 494 495 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 496 497 if (sc->sc_dying) 498 return (EIO); 499 500 switch (cmd) { 501 case FIONBIO: 502 /* All handled in the upper FS layer. */ 503 break; 504 505 case FIOASYNC: 506 mutex_enter(proc_lock); 507 if (*(int *)addr) { 508 if (sc->sc_async != NULL) 509 return (EBUSY); 510 sc->sc_async = l->l_proc; 511 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 512 } else 513 sc->sc_async = NULL; 514 mutex_exit(proc_lock); 515 break; 516 517 /* XXX this is not the most general solution. */ 518 case TIOCSPGRP: 519 mutex_enter(proc_lock); 520 if (sc->sc_async == NULL) { 521 mutex_exit(proc_lock); 522 return (EINVAL); 523 } 524 if (*(int *)addr != sc->sc_async->p_pgid) { 525 mutex_exit(proc_lock); 526 return (EPERM); 527 } 528 mutex_exit(proc_lock); 529 break; 530 531 case FIOSETOWN: 532 mutex_enter(proc_lock); 533 if (sc->sc_async == NULL) { 534 mutex_exit(proc_lock); 535 return (EINVAL); 536 } 537 if (-*(int *)addr != sc->sc_async->p_pgid 538 && *(int *)addr != sc->sc_async->p_pid) { 539 mutex_exit(proc_lock); 540 return (EPERM); 541 } 542 mutex_exit(proc_lock); 543 break; 544 545 case USB_GET_REPORT_DESC: 546 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 547 rd = (struct usb_ctl_report_desc *)addr; 548 size = min(size, sizeof rd->ucrd_data); 549 rd->ucrd_size = size; 550 memcpy(rd->ucrd_data, desc, size); 551 break; 552 553 case USB_SET_IMMED: 554 if (*(int *)addr) { 555 extra = sc->sc_hdev.sc_report_id != 0; 556 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 557 buffer, sc->sc_isize + extra); 558 if (err) 559 return (EOPNOTSUPP); 560 561 sc->sc_state |= UHID_IMMED; 562 } else 563 sc->sc_state &= ~UHID_IMMED; 564 break; 565 566 case USB_GET_REPORT: 567 re = (struct usb_ctl_report *)addr; 568 switch (re->ucr_report) { 569 case UHID_INPUT_REPORT: 570 size = sc->sc_isize; 571 break; 572 case UHID_OUTPUT_REPORT: 573 size = sc->sc_osize; 574 break; 575 case UHID_FEATURE_REPORT: 576 size = sc->sc_fsize; 577 break; 578 default: 579 return (EINVAL); 580 } 581 extra = sc->sc_hdev.sc_report_id != 0; 582 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 583 re->ucr_data, size + extra); 584 if (extra) 585 memcpy(re->ucr_data, re->ucr_data+1, size); 586 if (err) 587 return (EIO); 588 break; 589 590 case USB_SET_REPORT: 591 re = (struct usb_ctl_report *)addr; 592 switch (re->ucr_report) { 593 case UHID_INPUT_REPORT: 594 size = sc->sc_isize; 595 break; 596 case UHID_OUTPUT_REPORT: 597 size = sc->sc_osize; 598 break; 599 case UHID_FEATURE_REPORT: 600 size = sc->sc_fsize; 601 break; 602 default: 603 return (EINVAL); 604 } 605 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 606 re->ucr_data, size); 607 if (err) 608 return (EIO); 609 break; 610 611 case USB_GET_REPORT_ID: 612 *(int *)addr = sc->sc_hdev.sc_report_id; 613 break; 614 615 case USB_GET_DEVICE_DESC: 616 *(usb_device_descriptor_t *)addr = 617 *usbd_get_device_descriptor(sc->sc_hdev.sc_parent->sc_udev); 618 break; 619 620 case USB_GET_DEVICEINFO: 621 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 622 (struct usb_device_info *)addr, 0); 623 break; 624 #ifdef COMPAT_30 625 case USB_GET_DEVICEINFO_OLD: 626 usbd_fill_deviceinfo_old(sc->sc_hdev.sc_parent->sc_udev, 627 (struct usb_device_info_old *)addr, 0); 628 629 break; 630 #endif 631 case USB_GET_STRING_DESC: 632 { 633 struct usb_string_desc *si = (struct usb_string_desc *)addr; 634 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 635 si->usd_string_index, 636 si->usd_language_id, &si->usd_desc, &size); 637 if (err) 638 return (EINVAL); 639 break; 640 } 641 642 default: 643 return (EINVAL); 644 } 645 return (0); 646 } 647 648 int 649 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 650 { 651 struct uhid_softc *sc; 652 int error; 653 654 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 655 if (sc == NULL) 656 return ENXIO; 657 658 if (sc->sc_dying) 659 return EIO; 660 661 mutex_enter(&sc->sc_lock); 662 sc->sc_refcnt++; 663 mutex_exit(&sc->sc_lock); 664 665 mutex_enter(&sc->sc_access_lock); 666 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 667 mutex_exit(&sc->sc_access_lock); 668 669 mutex_enter(&sc->sc_lock); 670 if (--sc->sc_refcnt < 0) 671 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 672 mutex_exit(&sc->sc_lock); 673 return (error); 674 } 675 676 int 677 uhidpoll(dev_t dev, int events, struct lwp *l) 678 { 679 struct uhid_softc *sc; 680 int revents = 0; 681 682 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 683 if (sc == NULL) 684 return ENXIO; 685 686 if (sc->sc_dying) 687 return EIO; 688 689 mutex_enter(&sc->sc_lock); 690 if (events & (POLLOUT | POLLWRNORM)) 691 revents |= events & (POLLOUT | POLLWRNORM); 692 if (events & (POLLIN | POLLRDNORM)) { 693 if (sc->sc_q.c_cc > 0) 694 revents |= events & (POLLIN | POLLRDNORM); 695 else 696 selrecord(l, &sc->sc_rsel); 697 } 698 mutex_exit(&sc->sc_lock); 699 700 return (revents); 701 } 702 703 static void 704 filt_uhidrdetach(struct knote *kn) 705 { 706 struct uhid_softc *sc = kn->kn_hook; 707 708 mutex_enter(&sc->sc_lock); 709 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 710 mutex_exit(&sc->sc_lock); 711 } 712 713 static int 714 filt_uhidread(struct knote *kn, long hint) 715 { 716 struct uhid_softc *sc = kn->kn_hook; 717 718 kn->kn_data = sc->sc_q.c_cc; 719 return (kn->kn_data > 0); 720 } 721 722 static const struct filterops uhidread_filtops = 723 { 1, NULL, filt_uhidrdetach, filt_uhidread }; 724 725 static const struct filterops uhid_seltrue_filtops = 726 { 1, NULL, filt_uhidrdetach, filt_seltrue }; 727 728 int 729 uhidkqfilter(dev_t dev, struct knote *kn) 730 { 731 struct uhid_softc *sc; 732 struct klist *klist; 733 734 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 735 736 if (sc->sc_dying) 737 return (ENXIO); 738 739 switch (kn->kn_filter) { 740 case EVFILT_READ: 741 klist = &sc->sc_rsel.sel_klist; 742 kn->kn_fop = &uhidread_filtops; 743 break; 744 745 case EVFILT_WRITE: 746 klist = &sc->sc_rsel.sel_klist; 747 kn->kn_fop = &uhid_seltrue_filtops; 748 break; 749 750 default: 751 return (EINVAL); 752 } 753 754 kn->kn_hook = sc; 755 756 mutex_enter(&sc->sc_lock); 757 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 758 mutex_exit(&sc->sc_lock); 759 760 return (0); 761 } 762
Indexes created Wed Sep 24 05:09:52 GMT 2025