1 /* $NetBSD: uhid.c,v 1.101 2017/12/10 17:03:07 bouyer 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@augustsson.net) at 9 * Carlstedt Research & Technology and Matthew R. Green (mrg@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 1.101 2017/12/10 17:03:07 bouyer 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/usb_quirks.h> 68 #include <dev/hid/hid.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 usb_detach_wait(sc->sc_hdev.sc_dev, 233 &sc->sc_detach_cv, &sc->sc_lock); 234 } 235 } 236 mutex_exit(&sc->sc_lock); 237 238 /* locate the major number */ 239 maj = cdevsw_lookup_major(&uhid_cdevsw); 240 241 /* Nuke the vnodes for any open instances (calls close). */ 242 mn = device_unit(self); 243 vdevgone(maj, mn, mn, VCHR); 244 245 #if 0 246 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, 247 sc->sc_hdev.sc_parent->sc_udev, 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); 320 321 /* 322 * uhid interrupts aren't enabled yet, so setup sc_q now, as 323 * long as they're not already allocated. 324 */ 325 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 326 mutex_exit(&sc->sc_access_lock); 327 return EBUSY; 328 } 329 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 330 mutex_exit(&sc->sc_access_lock); 331 return ENOMEM; 332 } 333 334 error = uhidev_open(&sc->sc_hdev); 335 if (error) { 336 clfree(&sc->sc_q); 337 mutex_exit(&sc->sc_access_lock); 338 return error; 339 } 340 mutex_exit(&sc->sc_access_lock); 341 342 if (sc->sc_osize > 0) 343 sc->sc_obuf = kmem_alloc(sc->sc_osize, KM_SLEEP); 344 else 345 sc->sc_obuf = NULL; 346 sc->sc_state &= ~UHID_IMMED; 347 348 mutex_enter(proc_lock); 349 sc->sc_async = NULL; 350 mutex_exit(proc_lock); 351 352 return 0; 353 } 354 355 int 356 uhidclose(dev_t dev, int flag, int mode, struct lwp *l) 357 { 358 struct uhid_softc *sc; 359 360 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 361 362 DPRINTF(("uhidclose: sc=%p\n", sc)); 363 364 mutex_enter(proc_lock); 365 sc->sc_async = NULL; 366 mutex_exit(proc_lock); 367 368 mutex_enter(&sc->sc_access_lock); 369 370 uhidev_stop(&sc->sc_hdev); 371 372 clfree(&sc->sc_q); 373 if (sc->sc_osize > 0) 374 kmem_free(sc->sc_obuf, sc->sc_osize); 375 376 uhidev_close(&sc->sc_hdev); 377 378 mutex_exit(&sc->sc_access_lock); 379 380 return 0; 381 } 382 383 int 384 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 385 { 386 int error = 0; 387 int extra; 388 size_t length; 389 u_char buffer[UHID_CHUNK]; 390 usbd_status err; 391 392 DPRINTFN(1, ("uhidread\n")); 393 if (sc->sc_state & UHID_IMMED) { 394 DPRINTFN(1, ("uhidread immed\n")); 395 extra = sc->sc_hdev.sc_report_id != 0; 396 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 397 buffer, sc->sc_isize + extra); 398 if (err) 399 return EIO; 400 return uiomove(buffer+extra, sc->sc_isize, uio); 401 } 402 403 mutex_enter(&sc->sc_lock); 404 while (sc->sc_q.c_cc == 0) { 405 if (flag & IO_NDELAY) { 406 mutex_exit(&sc->sc_lock); 407 return EWOULDBLOCK; 408 } 409 sc->sc_state |= UHID_ASLP; 410 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 411 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 412 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 413 if (sc->sc_dying) 414 error = EIO; 415 if (error) { 416 sc->sc_state &= ~UHID_ASLP; 417 break; 418 } 419 } 420 421 /* Transfer as many chunks as possible. */ 422 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 423 length = min(sc->sc_q.c_cc, uio->uio_resid); 424 if (length > sizeof(buffer)) 425 length = sizeof(buffer); 426 427 /* Remove a small chunk from the input queue. */ 428 (void) q_to_b(&sc->sc_q, buffer, length); 429 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 430 431 /* Copy the data to the user process. */ 432 mutex_exit(&sc->sc_lock); 433 if ((error = uiomove(buffer, length, uio)) != 0) 434 return error; 435 mutex_enter(&sc->sc_lock); 436 } 437 438 mutex_exit(&sc->sc_lock); 439 return error; 440 } 441 442 int 443 uhidread(dev_t dev, struct uio *uio, int flag) 444 { 445 struct uhid_softc *sc; 446 int error; 447 448 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 449 450 mutex_enter(&sc->sc_lock); 451 sc->sc_refcnt++; 452 mutex_exit(&sc->sc_lock); 453 454 mutex_enter(&sc->sc_access_lock); 455 error = uhid_do_read(sc, uio, flag); 456 mutex_exit(&sc->sc_access_lock); 457 458 mutex_enter(&sc->sc_lock); 459 if (--sc->sc_refcnt < 0) 460 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 461 mutex_exit(&sc->sc_lock); 462 return error; 463 } 464 465 int 466 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 467 { 468 int error; 469 int size; 470 usbd_status err; 471 472 DPRINTFN(1, ("uhidwrite\n")); 473 474 if (sc->sc_dying) 475 return EIO; 476 477 size = sc->sc_osize; 478 error = 0; 479 if (uio->uio_resid != size || size == 0) 480 return EINVAL; 481 error = uiomove(sc->sc_obuf, size, uio); 482 if (!error) { 483 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 484 sc->sc_obuf, size); 485 if (err) 486 error = EIO; 487 } 488 489 return error; 490 } 491 492 int 493 uhidwrite(dev_t dev, struct uio *uio, int flag) 494 { 495 struct uhid_softc *sc; 496 int error; 497 498 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 499 500 mutex_enter(&sc->sc_lock); 501 sc->sc_refcnt++; 502 mutex_exit(&sc->sc_lock); 503 504 mutex_enter(&sc->sc_access_lock); 505 error = uhid_do_write(sc, uio, flag); 506 mutex_exit(&sc->sc_access_lock); 507 508 mutex_enter(&sc->sc_lock); 509 if (--sc->sc_refcnt < 0) 510 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 511 mutex_exit(&sc->sc_lock); 512 return error; 513 } 514 515 int 516 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr, 517 int flag, struct lwp *l) 518 { 519 struct usb_ctl_report_desc *rd; 520 struct usb_ctl_report *re; 521 u_char buffer[UHID_CHUNK]; 522 int size, extra; 523 usbd_status err; 524 void *desc; 525 526 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 527 528 if (sc->sc_dying) 529 return EIO; 530 531 switch (cmd) { 532 case FIONBIO: 533 /* All handled in the upper FS layer. */ 534 break; 535 536 case FIOASYNC: 537 mutex_enter(proc_lock); 538 if (*(int *)addr) { 539 if (sc->sc_async != NULL) 540 return EBUSY; 541 sc->sc_async = l->l_proc; 542 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 543 } else 544 sc->sc_async = NULL; 545 mutex_exit(proc_lock); 546 break; 547 548 /* XXX this is not the most general solution. */ 549 case TIOCSPGRP: 550 mutex_enter(proc_lock); 551 if (sc->sc_async == NULL) { 552 mutex_exit(proc_lock); 553 return EINVAL; 554 } 555 if (*(int *)addr != sc->sc_async->p_pgid) { 556 mutex_exit(proc_lock); 557 return EPERM; 558 } 559 mutex_exit(proc_lock); 560 break; 561 562 case FIOSETOWN: 563 mutex_enter(proc_lock); 564 if (sc->sc_async == NULL) { 565 mutex_exit(proc_lock); 566 return EINVAL; 567 } 568 if (-*(int *)addr != sc->sc_async->p_pgid 569 && *(int *)addr != sc->sc_async->p_pid) { 570 mutex_exit(proc_lock); 571 return EPERM; 572 } 573 mutex_exit(proc_lock); 574 break; 575 576 case USB_GET_REPORT_DESC: 577 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 578 rd = (struct usb_ctl_report_desc *)addr; 579 size = min(size, sizeof(rd->ucrd_data)); 580 rd->ucrd_size = size; 581 memcpy(rd->ucrd_data, desc, size); 582 break; 583 584 case USB_SET_IMMED: 585 if (*(int *)addr) { 586 extra = sc->sc_hdev.sc_report_id != 0; 587 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 588 buffer, sc->sc_isize + extra); 589 if (err) 590 return EOPNOTSUPP; 591 592 sc->sc_state |= UHID_IMMED; 593 } else 594 sc->sc_state &= ~UHID_IMMED; 595 break; 596 597 case USB_GET_REPORT: 598 re = (struct usb_ctl_report *)addr; 599 switch (re->ucr_report) { 600 case UHID_INPUT_REPORT: 601 size = sc->sc_isize; 602 break; 603 case UHID_OUTPUT_REPORT: 604 size = sc->sc_osize; 605 break; 606 case UHID_FEATURE_REPORT: 607 size = sc->sc_fsize; 608 break; 609 default: 610 return EINVAL; 611 } 612 extra = sc->sc_hdev.sc_report_id != 0; 613 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 614 re->ucr_data, size + extra); 615 if (extra) 616 memmove(re->ucr_data, re->ucr_data+1, size); 617 if (err) 618 return EIO; 619 break; 620 621 case USB_SET_REPORT: 622 re = (struct usb_ctl_report *)addr; 623 switch (re->ucr_report) { 624 case UHID_INPUT_REPORT: 625 size = sc->sc_isize; 626 break; 627 case UHID_OUTPUT_REPORT: 628 size = sc->sc_osize; 629 break; 630 case UHID_FEATURE_REPORT: 631 size = sc->sc_fsize; 632 break; 633 default: 634 return EINVAL; 635 } 636 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 637 re->ucr_data, size); 638 if (err) 639 return EIO; 640 break; 641 642 case USB_GET_REPORT_ID: 643 *(int *)addr = sc->sc_hdev.sc_report_id; 644 break; 645 646 case USB_GET_DEVICE_DESC: 647 *(usb_device_descriptor_t *)addr = 648 *usbd_get_device_descriptor(sc->sc_hdev.sc_parent->sc_udev); 649 break; 650 651 case USB_GET_DEVICEINFO: 652 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 653 (struct usb_device_info *)addr, 0); 654 break; 655 #ifdef COMPAT_30 656 case USB_GET_DEVICEINFO_OLD: 657 usbd_fill_deviceinfo_old(sc->sc_hdev.sc_parent->sc_udev, 658 (struct usb_device_info_old *)addr, 0); 659 660 break; 661 #endif 662 case USB_GET_STRING_DESC: 663 { 664 struct usb_string_desc *si = (struct usb_string_desc *)addr; 665 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 666 si->usd_string_index, 667 si->usd_language_id, &si->usd_desc, &size); 668 if (err) 669 return EINVAL; 670 break; 671 } 672 673 default: 674 return EINVAL; 675 } 676 return 0; 677 } 678 679 int 680 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 681 { 682 struct uhid_softc *sc; 683 int error; 684 685 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 686 if (sc == NULL) 687 return ENXIO; 688 689 if (sc->sc_dying) 690 return EIO; 691 692 mutex_enter(&sc->sc_lock); 693 sc->sc_refcnt++; 694 mutex_exit(&sc->sc_lock); 695 696 mutex_enter(&sc->sc_access_lock); 697 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 698 mutex_exit(&sc->sc_access_lock); 699 700 mutex_enter(&sc->sc_lock); 701 if (--sc->sc_refcnt < 0) 702 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 703 mutex_exit(&sc->sc_lock); 704 return error; 705 } 706 707 int 708 uhidpoll(dev_t dev, int events, struct lwp *l) 709 { 710 struct uhid_softc *sc; 711 int revents = 0; 712 713 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 714 if (sc == NULL) 715 return ENXIO; 716 717 if (sc->sc_dying) 718 return EIO; 719 720 mutex_enter(&sc->sc_lock); 721 if (events & (POLLOUT | POLLWRNORM)) 722 revents |= events & (POLLOUT | POLLWRNORM); 723 if (events & (POLLIN | POLLRDNORM)) { 724 if (sc->sc_q.c_cc > 0) 725 revents |= events & (POLLIN | POLLRDNORM); 726 else 727 selrecord(l, &sc->sc_rsel); 728 } 729 mutex_exit(&sc->sc_lock); 730 731 return revents; 732 } 733 734 static void 735 filt_uhidrdetach(struct knote *kn) 736 { 737 struct uhid_softc *sc = kn->kn_hook; 738 739 mutex_enter(&sc->sc_lock); 740 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 741 mutex_exit(&sc->sc_lock); 742 } 743 744 static int 745 filt_uhidread(struct knote *kn, long hint) 746 { 747 struct uhid_softc *sc = kn->kn_hook; 748 749 kn->kn_data = sc->sc_q.c_cc; 750 return kn->kn_data > 0; 751 } 752 753 static const struct filterops uhidread_filtops = { 754 .f_isfd = 1, 755 .f_attach = NULL, 756 .f_detach = filt_uhidrdetach, 757 .f_event = filt_uhidread, 758 }; 759 760 static const struct filterops uhid_seltrue_filtops = { 761 .f_isfd = 1, 762 .f_attach = NULL, 763 .f_detach = filt_uhidrdetach, 764 .f_event = filt_seltrue, 765 }; 766 767 int 768 uhidkqfilter(dev_t dev, struct knote *kn) 769 { 770 struct uhid_softc *sc; 771 struct klist *klist; 772 773 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 774 775 if (sc->sc_dying) 776 return ENXIO; 777 778 switch (kn->kn_filter) { 779 case EVFILT_READ: 780 klist = &sc->sc_rsel.sel_klist; 781 kn->kn_fop = &uhidread_filtops; 782 break; 783 784 case EVFILT_WRITE: 785 klist = &sc->sc_rsel.sel_klist; 786 kn->kn_fop = &uhid_seltrue_filtops; 787 break; 788 789 default: 790 return EINVAL; 791 } 792 793 kn->kn_hook = sc; 794 795 mutex_enter(&sc->sc_lock); 796 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 797 mutex_exit(&sc->sc_lock); 798 799 return 0; 800 } 801