uhid.c revision 1.84.8.3
1 /* $NetBSD: uhid.c,v 1.84.8.3 2012/10/30 17:22:08 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 1.84.8.3 2012/10/30 17:22:08 yamt 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 kmutex_t sc_access_lock; /* serialises syscall accesses */ 82 kmutex_t sc_lock; /* protects refcnt, others */ 83 kcondvar_t sc_cv; 84 kcondvar_t sc_detach_cv; 85 86 int sc_isize; 87 int sc_osize; 88 int sc_fsize; 89 90 u_char *sc_obuf; 91 92 struct clist sc_q; 93 struct selinfo sc_rsel; 94 proc_t *sc_async; /* process that wants SIGIO */ 95 void *sc_sih; 96 u_char sc_state; /* driver state */ 97 #define UHID_ASLP 0x01 /* waiting for device data */ 98 #define UHID_IMMED 0x02 /* return read data immediately */ 99 100 int sc_refcnt; 101 u_char sc_dying; 102 }; 103 104 #define UHIDUNIT(dev) (minor(dev)) 105 #define UHID_CHUNK 128 /* chunk size for read */ 106 #define UHID_BSIZE 1020 /* buffer size */ 107 108 dev_type_open(uhidopen); 109 dev_type_close(uhidclose); 110 dev_type_read(uhidread); 111 dev_type_write(uhidwrite); 112 dev_type_ioctl(uhidioctl); 113 dev_type_poll(uhidpoll); 114 dev_type_kqfilter(uhidkqfilter); 115 116 const struct cdevsw uhid_cdevsw = { 117 uhidopen, uhidclose, uhidread, uhidwrite, uhidioctl, 118 nostop, notty, uhidpoll, nommap, uhidkqfilter, D_OTHER | D_MPSAFE, 119 }; 120 121 Static void uhid_intr(struct uhidev *, void *, u_int len); 122 Static void uhid_softintr(void *); 123 124 Static int uhid_do_read(struct uhid_softc *, struct uio *uio, int); 125 Static int uhid_do_write(struct uhid_softc *, struct uio *uio, int); 126 Static int uhid_do_ioctl(struct uhid_softc*, u_long, void *, int, struct lwp *); 127 128 int uhid_match(device_t, cfdata_t, void *); 129 void uhid_attach(device_t, device_t, void *); 130 int uhid_detach(device_t, int); 131 int uhid_activate(device_t, enum devact); 132 extern struct cfdriver uhid_cd; 133 CFATTACH_DECL_NEW(uhid, sizeof(struct uhid_softc), uhid_match, uhid_attach, uhid_detach, uhid_activate); 134 135 int 136 uhid_match(device_t parent, cfdata_t match, void *aux) 137 { 138 #ifdef UHID_DEBUG 139 struct uhidev_attach_arg *uha = aux; 140 #endif 141 142 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 143 144 if (match->cf_flags & 1) 145 return (UMATCH_HIGHEST); 146 else 147 return (UMATCH_IFACECLASS_GENERIC); 148 } 149 150 void 151 uhid_attach(device_t parent, device_t self, void *aux) 152 { 153 struct uhid_softc *sc = device_private(self); 154 struct uhidev_attach_arg *uha = aux; 155 int size, repid; 156 void *desc; 157 158 sc->sc_hdev.sc_dev = self; 159 selinit(&sc->sc_rsel); 160 sc->sc_hdev.sc_intr = uhid_intr; 161 sc->sc_hdev.sc_parent = uha->parent; 162 sc->sc_hdev.sc_report_id = uha->reportid; 163 sc->sc_sih = softint_establish(SOFTINT_MPSAFE | SOFTINT_CLOCK, 164 uhid_softintr, sc); 165 166 uhidev_get_report_desc(uha->parent, &desc, &size); 167 repid = uha->reportid; 168 sc->sc_isize = hid_report_size(desc, size, hid_input, repid); 169 sc->sc_osize = hid_report_size(desc, size, hid_output, repid); 170 sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid); 171 172 aprint_naive("\n"); 173 aprint_normal(": input=%d, output=%d, feature=%d\n", 174 sc->sc_isize, sc->sc_osize, sc->sc_fsize); 175 176 mutex_init(&sc->sc_access_lock, MUTEX_DEFAULT, IPL_NONE); 177 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_USB); 178 cv_init(&sc->sc_cv, "uhidrea"); 179 cv_init(&sc->sc_detach_cv, "uhiddet"); 180 181 if (!pmf_device_register(self, NULL, NULL)) 182 aprint_error_dev(self, "couldn't establish power handler\n"); 183 184 return; 185 } 186 187 int 188 uhid_activate(device_t self, enum devact act) 189 { 190 struct uhid_softc *sc = device_private(self); 191 192 switch (act) { 193 case DVACT_DEACTIVATE: 194 sc->sc_dying = 1; 195 return 0; 196 default: 197 return EOPNOTSUPP; 198 } 199 } 200 201 int 202 uhid_detach(device_t self, int flags) 203 { 204 struct uhid_softc *sc = device_private(self); 205 int maj, mn; 206 207 DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); 208 209 sc->sc_dying = 1; 210 211 mutex_enter(&sc->sc_lock); 212 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 213 if (--sc->sc_refcnt >= 0) { 214 /* Wake everyone */ 215 cv_broadcast(&sc->sc_cv); 216 /* Wait for processes to go away. */ 217 usb_detach_wait(sc->sc_hdev.sc_dev, 218 &sc->sc_detach_cv, &sc->sc_lock); 219 } 220 } 221 mutex_exit(&sc->sc_lock); 222 223 /* locate the major number */ 224 maj = cdevsw_lookup_major(&uhid_cdevsw); 225 226 /* Nuke the vnodes for any open instances (calls close). */ 227 mn = device_unit(self); 228 vdevgone(maj, mn, mn, VCHR); 229 230 #if 0 231 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, 232 sc->sc_hdev.sc_parent->sc_udev, 233 sc->sc_hdev.sc_dev); 234 #endif 235 cv_destroy(&sc->sc_cv); 236 cv_destroy(&sc->sc_detach_cv); 237 mutex_destroy(&sc->sc_lock); 238 mutex_destroy(&sc->sc_access_lock); 239 seldestroy(&sc->sc_rsel); 240 softint_disestablish(sc->sc_sih); 241 242 return (0); 243 } 244 245 void 246 uhid_intr(struct uhidev *addr, void *data, u_int len) 247 { 248 struct uhid_softc *sc = (struct uhid_softc *)addr; 249 250 #ifdef UHID_DEBUG 251 if (uhiddebug > 5) { 252 u_int32_t i; 253 254 DPRINTF(("uhid_intr: data =")); 255 for (i = 0; i < len; i++) 256 DPRINTF((" %02x", ((u_char *)data)[i])); 257 DPRINTF(("\n")); 258 } 259 #endif 260 261 mutex_enter(&sc->sc_lock); 262 (void)b_to_q(data, len, &sc->sc_q); 263 264 if (sc->sc_state & UHID_ASLP) { 265 sc->sc_state &= ~UHID_ASLP; 266 DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); 267 cv_broadcast(&sc->sc_cv); 268 } 269 selnotify(&sc->sc_rsel, 0, 0); 270 if (sc->sc_async != NULL) { 271 DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async)); 272 softint_schedule(sc->sc_sih); 273 } 274 mutex_exit(&sc->sc_lock); 275 } 276 277 void 278 uhid_softintr(void *cookie) 279 { 280 struct uhid_softc *sc; 281 282 sc = cookie; 283 284 mutex_enter(proc_lock); 285 if (sc->sc_async != NULL) 286 psignal(sc->sc_async, SIGIO); 287 mutex_exit(proc_lock); 288 } 289 290 int 291 uhidopen(dev_t dev, int flag, int mode, struct lwp *l) 292 { 293 struct uhid_softc *sc; 294 int error; 295 296 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 297 if (sc == NULL) 298 return ENXIO; 299 300 DPRINTF(("uhidopen: sc=%p\n", sc)); 301 302 if (sc->sc_dying) 303 return (ENXIO); 304 305 mutex_enter(&sc->sc_access_lock); 306 error = uhidev_open(&sc->sc_hdev); 307 if (error) { 308 mutex_exit(&sc->sc_access_lock); 309 return (error); 310 } 311 mutex_exit(&sc->sc_access_lock); 312 313 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 314 mutex_enter(&sc->sc_access_lock); 315 uhidev_close(&sc->sc_hdev); 316 mutex_exit(&sc->sc_access_lock); 317 return (ENOMEM); 318 } 319 sc->sc_obuf = malloc(sc->sc_osize, M_USBDEV, M_WAITOK); 320 sc->sc_state &= ~UHID_IMMED; 321 322 mutex_enter(proc_lock); 323 sc->sc_async = NULL; 324 mutex_exit(proc_lock); 325 326 return (0); 327 } 328 329 int 330 uhidclose(dev_t dev, int flag, int mode, struct lwp *l) 331 { 332 struct uhid_softc *sc; 333 334 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 335 336 DPRINTF(("uhidclose: sc=%p\n", sc)); 337 338 clfree(&sc->sc_q); 339 free(sc->sc_obuf, M_USBDEV); 340 341 mutex_enter(proc_lock); 342 sc->sc_async = NULL; 343 mutex_exit(proc_lock); 344 345 mutex_enter(&sc->sc_access_lock); 346 uhidev_close(&sc->sc_hdev); 347 mutex_exit(&sc->sc_access_lock); 348 349 return (0); 350 } 351 352 int 353 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 354 { 355 int error = 0; 356 int extra; 357 size_t length; 358 u_char buffer[UHID_CHUNK]; 359 usbd_status err; 360 361 DPRINTFN(1, ("uhidread\n")); 362 if (sc->sc_state & UHID_IMMED) { 363 DPRINTFN(1, ("uhidread immed\n")); 364 extra = sc->sc_hdev.sc_report_id != 0; 365 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 366 buffer, sc->sc_isize + extra); 367 if (err) 368 return (EIO); 369 return (uiomove(buffer+extra, sc->sc_isize, uio)); 370 } 371 372 mutex_enter(&sc->sc_lock); 373 while (sc->sc_q.c_cc == 0) { 374 if (flag & IO_NDELAY) { 375 mutex_exit(&sc->sc_lock); 376 return (EWOULDBLOCK); 377 } 378 sc->sc_state |= UHID_ASLP; 379 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 380 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 381 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 382 if (sc->sc_dying) 383 error = EIO; 384 if (error) { 385 sc->sc_state &= ~UHID_ASLP; 386 break; 387 } 388 } 389 mutex_exit(&sc->sc_lock); 390 391 /* Transfer as many chunks as possible. */ 392 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 393 length = min(sc->sc_q.c_cc, uio->uio_resid); 394 if (length > sizeof(buffer)) 395 length = sizeof(buffer); 396 397 /* Remove a small chunk from the input queue. */ 398 (void) q_to_b(&sc->sc_q, buffer, length); 399 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 400 401 /* Copy the data to the user process. */ 402 if ((error = uiomove(buffer, length, uio)) != 0) 403 break; 404 } 405 406 return (error); 407 } 408 409 int 410 uhidread(dev_t dev, struct uio *uio, int flag) 411 { 412 struct uhid_softc *sc; 413 int error; 414 415 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 416 417 mutex_enter(&sc->sc_lock); 418 sc->sc_refcnt++; 419 mutex_exit(&sc->sc_lock); 420 421 mutex_enter(&sc->sc_access_lock); 422 error = uhid_do_read(sc, uio, flag); 423 mutex_exit(&sc->sc_access_lock); 424 425 mutex_enter(&sc->sc_lock); 426 if (--sc->sc_refcnt < 0) 427 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 428 mutex_exit(&sc->sc_lock); 429 return (error); 430 } 431 432 int 433 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 434 { 435 int error; 436 int size; 437 usbd_status err; 438 439 DPRINTFN(1, ("uhidwrite\n")); 440 441 if (sc->sc_dying) 442 return (EIO); 443 444 size = sc->sc_osize; 445 error = 0; 446 if (uio->uio_resid != size) 447 return (EINVAL); 448 error = uiomove(sc->sc_obuf, size, uio); 449 if (!error) { 450 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 451 sc->sc_obuf, size); 452 if (err) 453 error = EIO; 454 } 455 456 return (error); 457 } 458 459 int 460 uhidwrite(dev_t dev, struct uio *uio, int flag) 461 { 462 struct uhid_softc *sc; 463 int error; 464 465 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 466 467 mutex_enter(&sc->sc_lock); 468 sc->sc_refcnt++; 469 mutex_exit(&sc->sc_lock); 470 471 mutex_enter(&sc->sc_access_lock); 472 error = uhid_do_write(sc, uio, flag); 473 mutex_exit(&sc->sc_access_lock); 474 475 mutex_enter(&sc->sc_lock); 476 if (--sc->sc_refcnt < 0) 477 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 478 mutex_exit(&sc->sc_lock); 479 return (error); 480 } 481 482 int 483 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr, 484 int flag, struct lwp *l) 485 { 486 struct usb_ctl_report_desc *rd; 487 struct usb_ctl_report *re; 488 u_char buffer[UHID_CHUNK]; 489 int size, extra; 490 usbd_status err; 491 void *desc; 492 493 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 494 495 if (sc->sc_dying) 496 return (EIO); 497 498 switch (cmd) { 499 case FIONBIO: 500 /* All handled in the upper FS layer. */ 501 break; 502 503 case FIOASYNC: 504 mutex_enter(proc_lock); 505 if (*(int *)addr) { 506 if (sc->sc_async != NULL) 507 return (EBUSY); 508 sc->sc_async = l->l_proc; 509 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 510 } else 511 sc->sc_async = NULL; 512 mutex_exit(proc_lock); 513 break; 514 515 /* XXX this is not the most general solution. */ 516 case TIOCSPGRP: 517 mutex_enter(proc_lock); 518 if (sc->sc_async == NULL) { 519 mutex_exit(proc_lock); 520 return (EINVAL); 521 } 522 if (*(int *)addr != sc->sc_async->p_pgid) { 523 mutex_exit(proc_lock); 524 return (EPERM); 525 } 526 mutex_exit(proc_lock); 527 break; 528 529 case FIOSETOWN: 530 mutex_enter(proc_lock); 531 if (sc->sc_async == NULL) { 532 mutex_exit(proc_lock); 533 return (EINVAL); 534 } 535 if (-*(int *)addr != sc->sc_async->p_pgid 536 && *(int *)addr != sc->sc_async->p_pid) { 537 mutex_exit(proc_lock); 538 return (EPERM); 539 } 540 mutex_exit(proc_lock); 541 break; 542 543 case USB_GET_REPORT_DESC: 544 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 545 rd = (struct usb_ctl_report_desc *)addr; 546 size = min(size, sizeof rd->ucrd_data); 547 rd->ucrd_size = size; 548 memcpy(rd->ucrd_data, desc, size); 549 break; 550 551 case USB_SET_IMMED: 552 if (*(int *)addr) { 553 extra = sc->sc_hdev.sc_report_id != 0; 554 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 555 buffer, sc->sc_isize + extra); 556 if (err) 557 return (EOPNOTSUPP); 558 559 sc->sc_state |= UHID_IMMED; 560 } else 561 sc->sc_state &= ~UHID_IMMED; 562 break; 563 564 case USB_GET_REPORT: 565 re = (struct usb_ctl_report *)addr; 566 switch (re->ucr_report) { 567 case UHID_INPUT_REPORT: 568 size = sc->sc_isize; 569 break; 570 case UHID_OUTPUT_REPORT: 571 size = sc->sc_osize; 572 break; 573 case UHID_FEATURE_REPORT: 574 size = sc->sc_fsize; 575 break; 576 default: 577 return (EINVAL); 578 } 579 extra = sc->sc_hdev.sc_report_id != 0; 580 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 581 re->ucr_data, size + extra); 582 if (extra) 583 memcpy(re->ucr_data, re->ucr_data+1, size); 584 if (err) 585 return (EIO); 586 break; 587 588 case USB_SET_REPORT: 589 re = (struct usb_ctl_report *)addr; 590 switch (re->ucr_report) { 591 case UHID_INPUT_REPORT: 592 size = sc->sc_isize; 593 break; 594 case UHID_OUTPUT_REPORT: 595 size = sc->sc_osize; 596 break; 597 case UHID_FEATURE_REPORT: 598 size = sc->sc_fsize; 599 break; 600 default: 601 return (EINVAL); 602 } 603 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 604 re->ucr_data, size); 605 if (err) 606 return (EIO); 607 break; 608 609 case USB_GET_REPORT_ID: 610 *(int *)addr = sc->sc_hdev.sc_report_id; 611 break; 612 613 case USB_GET_DEVICE_DESC: 614 *(usb_device_descriptor_t *)addr = 615 *usbd_get_device_descriptor(sc->sc_hdev.sc_parent->sc_udev); 616 break; 617 618 case USB_GET_DEVICEINFO: 619 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 620 (struct usb_device_info *)addr, 0); 621 break; 622 #ifdef COMPAT_30 623 case USB_GET_DEVICEINFO_OLD: 624 usbd_fill_deviceinfo_old(sc->sc_hdev.sc_parent->sc_udev, 625 (struct usb_device_info_old *)addr, 0); 626 627 break; 628 #endif 629 case USB_GET_STRING_DESC: 630 { 631 struct usb_string_desc *si = (struct usb_string_desc *)addr; 632 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 633 si->usd_string_index, 634 si->usd_language_id, &si->usd_desc, &size); 635 if (err) 636 return (EINVAL); 637 break; 638 } 639 640 default: 641 return (EINVAL); 642 } 643 return (0); 644 } 645 646 int 647 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 648 { 649 struct uhid_softc *sc; 650 int error; 651 652 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 653 if (sc == NULL) 654 return ENXIO; 655 656 if (sc->sc_dying) 657 return EIO; 658 659 mutex_enter(&sc->sc_lock); 660 sc->sc_refcnt++; 661 mutex_exit(&sc->sc_lock); 662 663 mutex_enter(&sc->sc_access_lock); 664 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 665 mutex_exit(&sc->sc_access_lock); 666 667 mutex_enter(&sc->sc_lock); 668 if (--sc->sc_refcnt < 0) 669 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 670 mutex_exit(&sc->sc_lock); 671 return (error); 672 } 673 674 int 675 uhidpoll(dev_t dev, int events, struct lwp *l) 676 { 677 struct uhid_softc *sc; 678 int revents = 0; 679 680 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 681 if (sc == NULL) 682 return ENXIO; 683 684 if (sc->sc_dying) 685 return EIO; 686 687 mutex_enter(&sc->sc_lock); 688 if (events & (POLLOUT | POLLWRNORM)) 689 revents |= events & (POLLOUT | POLLWRNORM); 690 if (events & (POLLIN | POLLRDNORM)) { 691 if (sc->sc_q.c_cc > 0) 692 revents |= events & (POLLIN | POLLRDNORM); 693 else 694 selrecord(l, &sc->sc_rsel); 695 } 696 mutex_exit(&sc->sc_lock); 697 698 return (revents); 699 } 700 701 static void 702 filt_uhidrdetach(struct knote *kn) 703 { 704 struct uhid_softc *sc = kn->kn_hook; 705 706 mutex_enter(&sc->sc_lock); 707 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 708 mutex_exit(&sc->sc_lock); 709 } 710 711 static int 712 filt_uhidread(struct knote *kn, long hint) 713 { 714 struct uhid_softc *sc = kn->kn_hook; 715 716 kn->kn_data = sc->sc_q.c_cc; 717 return (kn->kn_data > 0); 718 } 719 720 static const struct filterops uhidread_filtops = 721 { 1, NULL, filt_uhidrdetach, filt_uhidread }; 722 723 static const struct filterops uhid_seltrue_filtops = 724 { 1, NULL, filt_uhidrdetach, filt_seltrue }; 725 726 int 727 uhidkqfilter(dev_t dev, struct knote *kn) 728 { 729 struct uhid_softc *sc; 730 struct klist *klist; 731 732 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 733 734 if (sc->sc_dying) 735 return (ENXIO); 736 737 switch (kn->kn_filter) { 738 case EVFILT_READ: 739 klist = &sc->sc_rsel.sel_klist; 740 kn->kn_fop = &uhidread_filtops; 741 break; 742 743 case EVFILT_WRITE: 744 klist = &sc->sc_rsel.sel_klist; 745 kn->kn_fop = &uhid_seltrue_filtops; 746 break; 747 748 default: 749 return (EINVAL); 750 } 751 752 kn->kn_hook = sc; 753 754 mutex_enter(&sc->sc_lock); 755 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 756 mutex_exit(&sc->sc_lock); 757 758 return (0); 759 } 760
Indexes created Thu Oct 02 14:10:14 GMT 2025