uhid.c revision 1.92.2.2
1 /* $NetBSD: uhid.c,v 1.92.2.2 2017/04/05 19:54:20 snj 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 1.92.2.2 2017/04/05 19:54:20 snj Exp $"); 39 40 #ifdef _KERNEL_OPT 41 #include "opt_compat_netbsd.h" 42 #include "opt_usb.h" 43 #endif 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/kmem.h> 49 #include <sys/signalvar.h> 50 #include <sys/device.h> 51 #include <sys/ioctl.h> 52 #include <sys/conf.h> 53 #include <sys/tty.h> 54 #include <sys/file.h> 55 #include <sys/select.h> 56 #include <sys/proc.h> 57 #include <sys/vnode.h> 58 #include <sys/poll.h> 59 #include <sys/intr.h> 60 61 #include <dev/usb/usb.h> 62 #include <dev/usb/usbhid.h> 63 64 #include <dev/usb/usbdevs.h> 65 #include <dev/usb/usbdi.h> 66 #include <dev/usb/usbdi_util.h> 67 #include <dev/usb/hid.h> 68 #include <dev/usb/usb_quirks.h> 69 70 #include <dev/usb/uhidev.h> 71 72 #ifdef UHID_DEBUG 73 #define DPRINTF(x) if (uhiddebug) printf x 74 #define DPRINTFN(n,x) if (uhiddebug>(n)) printf x 75 int uhiddebug = 0; 76 #else 77 #define DPRINTF(x) 78 #define DPRINTFN(n,x) 79 #endif 80 81 struct uhid_softc { 82 struct uhidev sc_hdev; 83 84 kmutex_t sc_access_lock; /* serialises syscall accesses */ 85 kmutex_t sc_lock; /* protects refcnt, others */ 86 kcondvar_t sc_cv; 87 kcondvar_t sc_detach_cv; 88 89 int sc_isize; 90 int sc_osize; 91 int sc_fsize; 92 93 u_char *sc_obuf; 94 95 struct clist sc_q; /* protected by sc_lock */ 96 struct selinfo sc_rsel; 97 proc_t *sc_async; /* process that wants SIGIO */ 98 void *sc_sih; 99 u_char sc_state; /* driver state */ 100 #define UHID_ASLP 0x01 /* waiting for device data */ 101 #define UHID_IMMED 0x02 /* return read data immediately */ 102 103 int sc_refcnt; 104 u_char sc_dying; 105 }; 106 107 #define UHIDUNIT(dev) (minor(dev)) 108 #define UHID_CHUNK 128 /* chunk size for read */ 109 #define UHID_BSIZE 1020 /* buffer size */ 110 111 dev_type_open(uhidopen); 112 dev_type_close(uhidclose); 113 dev_type_read(uhidread); 114 dev_type_write(uhidwrite); 115 dev_type_ioctl(uhidioctl); 116 dev_type_poll(uhidpoll); 117 dev_type_kqfilter(uhidkqfilter); 118 119 const struct cdevsw uhid_cdevsw = { 120 .d_open = uhidopen, 121 .d_close = uhidclose, 122 .d_read = uhidread, 123 .d_write = uhidwrite, 124 .d_ioctl = uhidioctl, 125 .d_stop = nostop, 126 .d_tty = notty, 127 .d_poll = uhidpoll, 128 .d_mmap = nommap, 129 .d_kqfilter = uhidkqfilter, 130 .d_discard = nodiscard, 131 .d_flag = D_OTHER 132 }; 133 134 Static void uhid_intr(struct uhidev *, void *, u_int); 135 Static void uhid_softintr(void *); 136 137 Static int uhid_do_read(struct uhid_softc *, struct uio *, int); 138 Static int uhid_do_write(struct uhid_softc *, struct uio *, int); 139 Static int uhid_do_ioctl(struct uhid_softc*, u_long, void *, int, struct lwp *); 140 141 int uhid_match(device_t, cfdata_t, void *); 142 void uhid_attach(device_t, device_t, void *); 143 int uhid_detach(device_t, int); 144 int uhid_activate(device_t, enum devact); 145 extern struct cfdriver uhid_cd; 146 CFATTACH_DECL_NEW(uhid, sizeof(struct uhid_softc), uhid_match, uhid_attach, 147 uhid_detach, uhid_activate); 148 149 int 150 uhid_match(device_t parent, cfdata_t match, void *aux) 151 { 152 #ifdef UHID_DEBUG 153 struct uhidev_attach_arg *uha = aux; 154 #endif 155 156 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 157 158 if (match->cf_flags & 1) 159 return UMATCH_HIGHEST; 160 else 161 return UMATCH_IFACECLASS_GENERIC; 162 } 163 164 void 165 uhid_attach(device_t parent, device_t self, void *aux) 166 { 167 struct uhid_softc *sc = device_private(self); 168 struct uhidev_attach_arg *uha = aux; 169 int size, repid; 170 void *desc; 171 172 sc->sc_hdev.sc_dev = self; 173 selinit(&sc->sc_rsel); 174 sc->sc_hdev.sc_intr = uhid_intr; 175 sc->sc_hdev.sc_parent = uha->parent; 176 sc->sc_hdev.sc_report_id = uha->reportid; 177 sc->sc_sih = softint_establish(SOFTINT_CLOCK, uhid_softintr, sc); 178 179 uhidev_get_report_desc(uha->parent, &desc, &size); 180 repid = uha->reportid; 181 sc->sc_isize = hid_report_size(desc, size, hid_input, repid); 182 sc->sc_osize = hid_report_size(desc, size, hid_output, repid); 183 sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid); 184 185 aprint_naive("\n"); 186 aprint_normal(": input=%d, output=%d, feature=%d\n", 187 sc->sc_isize, sc->sc_osize, sc->sc_fsize); 188 189 mutex_init(&sc->sc_access_lock, MUTEX_DEFAULT, IPL_NONE); 190 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_SOFTUSB); 191 cv_init(&sc->sc_cv, "uhidrea"); 192 cv_init(&sc->sc_detach_cv, "uhiddet"); 193 194 if (!pmf_device_register(self, NULL, NULL)) 195 aprint_error_dev(self, "couldn't establish power handler\n"); 196 197 return; 198 } 199 200 int 201 uhid_activate(device_t self, enum devact act) 202 { 203 struct uhid_softc *sc = device_private(self); 204 205 switch (act) { 206 case DVACT_DEACTIVATE: 207 sc->sc_dying = 1; 208 return 0; 209 default: 210 return EOPNOTSUPP; 211 } 212 } 213 214 int 215 uhid_detach(device_t self, int flags) 216 { 217 struct uhid_softc *sc = device_private(self); 218 int maj, mn; 219 220 DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); 221 222 sc->sc_dying = 1; 223 224 pmf_device_deregister(self); 225 226 mutex_enter(&sc->sc_lock); 227 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 228 if (--sc->sc_refcnt >= 0) { 229 /* Wake everyone */ 230 cv_broadcast(&sc->sc_cv); 231 /* Wait for processes to go away. */ 232 if (cv_timedwait(&sc->sc_detach_cv, &sc->sc_lock, hz * 60)) { 233 printf("%s: %s didn't detach\n", __func__, 234 device_xname(sc->sc_hdev.sc_dev)); 235 } 236 } 237 } 238 mutex_exit(&sc->sc_lock); 239 240 /* locate the major number */ 241 maj = cdevsw_lookup_major(&uhid_cdevsw); 242 243 /* Nuke the vnodes for any open instances (calls close). */ 244 mn = device_unit(self); 245 vdevgone(maj, mn, mn, VCHR); 246 247 #if 0 248 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, 249 sc->sc_hdev.sc_parent->sc_udev, sc->sc_hdev.sc_dev); 250 #endif 251 cv_destroy(&sc->sc_cv); 252 cv_destroy(&sc->sc_detach_cv); 253 mutex_destroy(&sc->sc_lock); 254 mutex_destroy(&sc->sc_access_lock); 255 seldestroy(&sc->sc_rsel); 256 softint_disestablish(sc->sc_sih); 257 258 return 0; 259 } 260 261 void 262 uhid_intr(struct uhidev *addr, void *data, u_int len) 263 { 264 struct uhid_softc *sc = (struct uhid_softc *)addr; 265 266 #ifdef UHID_DEBUG 267 if (uhiddebug > 5) { 268 uint32_t i; 269 270 DPRINTF(("uhid_intr: data =")); 271 for (i = 0; i < len; i++) 272 DPRINTF((" %02x", ((u_char *)data)[i])); 273 DPRINTF(("\n")); 274 } 275 #endif 276 277 mutex_enter(&sc->sc_lock); 278 (void)b_to_q(data, len, &sc->sc_q); 279 280 if (sc->sc_state & UHID_ASLP) { 281 sc->sc_state &= ~UHID_ASLP; 282 DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); 283 cv_broadcast(&sc->sc_cv); 284 } 285 selnotify(&sc->sc_rsel, 0, 0); 286 if (sc->sc_async != NULL) { 287 DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async)); 288 softint_schedule(sc->sc_sih); 289 } 290 mutex_exit(&sc->sc_lock); 291 } 292 293 void 294 uhid_softintr(void *cookie) 295 { 296 struct uhid_softc *sc; 297 298 sc = cookie; 299 300 mutex_enter(proc_lock); 301 if (sc->sc_async != NULL) 302 psignal(sc->sc_async, SIGIO); 303 mutex_exit(proc_lock); 304 } 305 306 int 307 uhidopen(dev_t dev, int flag, int mode, struct lwp *l) 308 { 309 struct uhid_softc *sc; 310 int error; 311 312 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 313 if (sc == NULL) 314 return ENXIO; 315 316 DPRINTF(("uhidopen: sc=%p\n", sc)); 317 318 if (sc->sc_dying) 319 return ENXIO; 320 321 mutex_enter(&sc->sc_access_lock); 322 323 /* 324 * uhid interrupts aren't enabled yet, so setup sc_q now, as 325 * long as they're not already allocated. 326 */ 327 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 328 mutex_exit(&sc->sc_access_lock); 329 return EBUSY; 330 } 331 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 332 mutex_exit(&sc->sc_access_lock); 333 return ENOMEM; 334 } 335 336 error = uhidev_open(&sc->sc_hdev); 337 if (error) { 338 clfree(&sc->sc_q); 339 mutex_exit(&sc->sc_access_lock); 340 return error; 341 } 342 mutex_exit(&sc->sc_access_lock); 343 344 if (sc->sc_osize > 0) 345 sc->sc_obuf = kmem_alloc(sc->sc_osize, KM_SLEEP); 346 else 347 sc->sc_obuf = NULL; 348 sc->sc_state &= ~UHID_IMMED; 349 350 mutex_enter(proc_lock); 351 sc->sc_async = NULL; 352 mutex_exit(proc_lock); 353 354 return 0; 355 } 356 357 int 358 uhidclose(dev_t dev, int flag, int mode, struct lwp *l) 359 { 360 struct uhid_softc *sc; 361 362 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 363 364 DPRINTF(("uhidclose: sc=%p\n", sc)); 365 366 mutex_enter(proc_lock); 367 sc->sc_async = NULL; 368 mutex_exit(proc_lock); 369 370 mutex_enter(&sc->sc_access_lock); 371 372 uhidev_stop(&sc->sc_hdev); 373 374 clfree(&sc->sc_q); 375 if (sc->sc_osize > 0) 376 kmem_free(sc->sc_obuf, sc->sc_osize); 377 378 uhidev_close(&sc->sc_hdev); 379 380 mutex_exit(&sc->sc_access_lock); 381 382 return 0; 383 } 384 385 int 386 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 387 { 388 int error = 0; 389 int extra; 390 size_t length; 391 u_char buffer[UHID_CHUNK]; 392 usbd_status err; 393 394 DPRINTFN(1, ("uhidread\n")); 395 if (sc->sc_state & UHID_IMMED) { 396 DPRINTFN(1, ("uhidread immed\n")); 397 extra = sc->sc_hdev.sc_report_id != 0; 398 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 399 buffer, sc->sc_isize + extra); 400 if (err) 401 return EIO; 402 return uiomove(buffer+extra, sc->sc_isize, uio); 403 } 404 405 mutex_enter(&sc->sc_lock); 406 while (sc->sc_q.c_cc == 0) { 407 if (flag & IO_NDELAY) { 408 mutex_exit(&sc->sc_lock); 409 return EWOULDBLOCK; 410 } 411 sc->sc_state |= UHID_ASLP; 412 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 413 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 414 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 415 if (sc->sc_dying) 416 error = EIO; 417 if (error) { 418 sc->sc_state &= ~UHID_ASLP; 419 break; 420 } 421 } 422 423 /* Transfer as many chunks as possible. */ 424 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 425 length = min(sc->sc_q.c_cc, uio->uio_resid); 426 if (length > sizeof(buffer)) 427 length = sizeof(buffer); 428 429 /* Remove a small chunk from the input queue. */ 430 (void) q_to_b(&sc->sc_q, buffer, length); 431 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 432 433 /* Copy the data to the user process. */ 434 mutex_exit(&sc->sc_lock); 435 if ((error = uiomove(buffer, length, uio)) != 0) 436 return error; 437 mutex_enter(&sc->sc_lock); 438 } 439 440 mutex_exit(&sc->sc_lock); 441 return error; 442 } 443 444 int 445 uhidread(dev_t dev, struct uio *uio, int flag) 446 { 447 struct uhid_softc *sc; 448 int error; 449 450 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 451 452 mutex_enter(&sc->sc_lock); 453 sc->sc_refcnt++; 454 mutex_exit(&sc->sc_lock); 455 456 mutex_enter(&sc->sc_access_lock); 457 error = uhid_do_read(sc, uio, flag); 458 mutex_exit(&sc->sc_access_lock); 459 460 mutex_enter(&sc->sc_lock); 461 if (--sc->sc_refcnt < 0) 462 cv_broadcast(&sc->sc_detach_cv); 463 mutex_exit(&sc->sc_lock); 464 return error; 465 } 466 467 int 468 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 469 { 470 int error; 471 int size; 472 usbd_status err; 473 474 DPRINTFN(1, ("uhidwrite\n")); 475 476 if (sc->sc_dying) 477 return EIO; 478 479 size = sc->sc_osize; 480 error = 0; 481 if (uio->uio_resid != size || size == 0) 482 return EINVAL; 483 error = uiomove(sc->sc_obuf, size, uio); 484 if (!error) { 485 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 486 sc->sc_obuf, size); 487 if (err) 488 error = EIO; 489 } 490 491 return error; 492 } 493 494 int 495 uhidwrite(dev_t dev, struct uio *uio, int flag) 496 { 497 struct uhid_softc *sc; 498 int error; 499 500 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 501 502 mutex_enter(&sc->sc_lock); 503 sc->sc_refcnt++; 504 mutex_exit(&sc->sc_lock); 505 506 mutex_enter(&sc->sc_access_lock); 507 error = uhid_do_write(sc, uio, flag); 508 mutex_exit(&sc->sc_access_lock); 509 510 mutex_enter(&sc->sc_lock); 511 if (--sc->sc_refcnt < 0) 512 cv_broadcast(&sc->sc_detach_cv); 513 mutex_exit(&sc->sc_lock); 514 return error; 515 } 516 517 int 518 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr, 519 int flag, struct lwp *l) 520 { 521 struct usb_ctl_report_desc *rd; 522 struct usb_ctl_report *re; 523 u_char buffer[UHID_CHUNK]; 524 int size, extra; 525 usbd_status err; 526 void *desc; 527 528 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 529 530 if (sc->sc_dying) 531 return EIO; 532 533 switch (cmd) { 534 case FIONBIO: 535 /* All handled in the upper FS layer. */ 536 break; 537 538 case FIOASYNC: 539 mutex_enter(proc_lock); 540 if (*(int *)addr) { 541 if (sc->sc_async != NULL) 542 return EBUSY; 543 sc->sc_async = l->l_proc; 544 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 545 } else 546 sc->sc_async = NULL; 547 mutex_exit(proc_lock); 548 break; 549 550 /* XXX this is not the most general solution. */ 551 case TIOCSPGRP: 552 mutex_enter(proc_lock); 553 if (sc->sc_async == NULL) { 554 mutex_exit(proc_lock); 555 return EINVAL; 556 } 557 if (*(int *)addr != sc->sc_async->p_pgid) { 558 mutex_exit(proc_lock); 559 return EPERM; 560 } 561 mutex_exit(proc_lock); 562 break; 563 564 case FIOSETOWN: 565 mutex_enter(proc_lock); 566 if (sc->sc_async == NULL) { 567 mutex_exit(proc_lock); 568 return EINVAL; 569 } 570 if (-*(int *)addr != sc->sc_async->p_pgid 571 && *(int *)addr != sc->sc_async->p_pid) { 572 mutex_exit(proc_lock); 573 return EPERM; 574 } 575 mutex_exit(proc_lock); 576 break; 577 578 case USB_GET_REPORT_DESC: 579 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 580 rd = (struct usb_ctl_report_desc *)addr; 581 size = min(size, sizeof(rd->ucrd_data)); 582 rd->ucrd_size = size; 583 memcpy(rd->ucrd_data, desc, size); 584 break; 585 586 case USB_SET_IMMED: 587 if (*(int *)addr) { 588 extra = sc->sc_hdev.sc_report_id != 0; 589 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 590 buffer, sc->sc_isize + extra); 591 if (err) 592 return EOPNOTSUPP; 593 594 sc->sc_state |= UHID_IMMED; 595 } else 596 sc->sc_state &= ~UHID_IMMED; 597 break; 598 599 case USB_GET_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 extra = sc->sc_hdev.sc_report_id != 0; 615 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 616 re->ucr_data, size + extra); 617 if (extra) 618 memcpy(re->ucr_data, re->ucr_data+1, size); 619 if (err) 620 return EIO; 621 break; 622 623 case USB_SET_REPORT: 624 re = (struct usb_ctl_report *)addr; 625 switch (re->ucr_report) { 626 case UHID_INPUT_REPORT: 627 size = sc->sc_isize; 628 break; 629 case UHID_OUTPUT_REPORT: 630 size = sc->sc_osize; 631 break; 632 case UHID_FEATURE_REPORT: 633 size = sc->sc_fsize; 634 break; 635 default: 636 return EINVAL; 637 } 638 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 639 re->ucr_data, size); 640 if (err) 641 return EIO; 642 break; 643 644 case USB_GET_REPORT_ID: 645 *(int *)addr = sc->sc_hdev.sc_report_id; 646 break; 647 648 case USB_GET_DEVICE_DESC: 649 *(usb_device_descriptor_t *)addr = 650 *usbd_get_device_descriptor(sc->sc_hdev.sc_parent->sc_udev); 651 break; 652 653 case USB_GET_DEVICEINFO: 654 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 655 (struct usb_device_info *)addr, 0); 656 break; 657 #ifdef COMPAT_30 658 case USB_GET_DEVICEINFO_OLD: 659 usbd_fill_deviceinfo_old(sc->sc_hdev.sc_parent->sc_udev, 660 (struct usb_device_info_old *)addr, 0); 661 662 break; 663 #endif 664 case USB_GET_STRING_DESC: 665 { 666 struct usb_string_desc *si = (struct usb_string_desc *)addr; 667 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 668 si->usd_string_index, 669 si->usd_language_id, &si->usd_desc, &size); 670 if (err) 671 return EINVAL; 672 break; 673 } 674 675 default: 676 return EINVAL; 677 } 678 return 0; 679 } 680 681 int 682 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 683 { 684 struct uhid_softc *sc; 685 int error; 686 687 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 688 if (sc == NULL) 689 return ENXIO; 690 691 if (sc->sc_dying) 692 return EIO; 693 694 mutex_enter(&sc->sc_lock); 695 sc->sc_refcnt++; 696 mutex_exit(&sc->sc_lock); 697 698 mutex_enter(&sc->sc_access_lock); 699 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 700 mutex_exit(&sc->sc_access_lock); 701 702 mutex_enter(&sc->sc_lock); 703 if (--sc->sc_refcnt < 0) 704 cv_broadcast(&sc->sc_detach_cv); 705 mutex_exit(&sc->sc_lock); 706 return error; 707 } 708 709 int 710 uhidpoll(dev_t dev, int events, struct lwp *l) 711 { 712 struct uhid_softc *sc; 713 int revents = 0; 714 715 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 716 if (sc == NULL) 717 return ENXIO; 718 719 if (sc->sc_dying) 720 return EIO; 721 722 mutex_enter(&sc->sc_lock); 723 if (events & (POLLOUT | POLLWRNORM)) 724 revents |= events & (POLLOUT | POLLWRNORM); 725 if (events & (POLLIN | POLLRDNORM)) { 726 if (sc->sc_q.c_cc > 0) 727 revents |= events & (POLLIN | POLLRDNORM); 728 else 729 selrecord(l, &sc->sc_rsel); 730 } 731 mutex_exit(&sc->sc_lock); 732 733 return revents; 734 } 735 736 static void 737 filt_uhidrdetach(struct knote *kn) 738 { 739 struct uhid_softc *sc = kn->kn_hook; 740 741 mutex_enter(&sc->sc_lock); 742 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 743 mutex_exit(&sc->sc_lock); 744 } 745 746 static int 747 filt_uhidread(struct knote *kn, long hint) 748 { 749 struct uhid_softc *sc = kn->kn_hook; 750 751 kn->kn_data = sc->sc_q.c_cc; 752 return kn->kn_data > 0; 753 } 754 755 static const struct filterops uhidread_filtops = 756 { 1, NULL, filt_uhidrdetach, filt_uhidread }; 757 758 static const struct filterops uhid_seltrue_filtops = 759 { 1, NULL, filt_uhidrdetach, filt_seltrue }; 760 761 int 762 uhidkqfilter(dev_t dev, struct knote *kn) 763 { 764 struct uhid_softc *sc; 765 struct klist *klist; 766 767 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 768 769 if (sc->sc_dying) 770 return ENXIO; 771 772 switch (kn->kn_filter) { 773 case EVFILT_READ: 774 klist = &sc->sc_rsel.sel_klist; 775 kn->kn_fop = &uhidread_filtops; 776 break; 777 778 case EVFILT_WRITE: 779 klist = &sc->sc_rsel.sel_klist; 780 kn->kn_fop = &uhid_seltrue_filtops; 781 break; 782 783 default: 784 return EINVAL; 785 } 786 787 kn->kn_hook = sc; 788 789 mutex_enter(&sc->sc_lock); 790 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 791 mutex_exit(&sc->sc_lock); 792 793 return 0; 794 } 795
Indexes created Thu Oct 02 14:10:14 GMT 2025