uhid.c revision 1.92.4.9
1 /* $NetBSD: uhid.c,v 1.92.4.9 2016/05/29 08:44:31 skrll 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 1.92.4.9 2016/05/29 08:44:31 skrll 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, uhid_detach, uhid_activate); 147 148 int 149 uhid_match(device_t parent, cfdata_t match, void *aux) 150 { 151 #ifdef UHID_DEBUG 152 struct uhidev_attach_arg *uha = aux; 153 #endif 154 155 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 156 157 if (match->cf_flags & 1) 158 return UMATCH_HIGHEST; 159 else 160 return UMATCH_IFACECLASS_GENERIC; 161 } 162 163 void 164 uhid_attach(device_t parent, device_t self, void *aux) 165 { 166 struct uhid_softc *sc = device_private(self); 167 struct uhidev_attach_arg *uha = aux; 168 int size, repid; 169 void *desc; 170 171 sc->sc_hdev.sc_dev = self; 172 selinit(&sc->sc_rsel); 173 sc->sc_hdev.sc_intr = uhid_intr; 174 sc->sc_hdev.sc_parent = uha->parent; 175 sc->sc_hdev.sc_report_id = uha->reportid; 176 sc->sc_sih = softint_establish(SOFTINT_CLOCK, 177 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, 248 sc->sc_hdev.sc_dev); 249 #endif 250 cv_destroy(&sc->sc_cv); 251 cv_destroy(&sc->sc_detach_cv); 252 mutex_destroy(&sc->sc_lock); 253 mutex_destroy(&sc->sc_access_lock); 254 seldestroy(&sc->sc_rsel); 255 softint_disestablish(sc->sc_sih); 256 257 return 0; 258 } 259 260 void 261 uhid_intr(struct uhidev *addr, void *data, u_int len) 262 { 263 struct uhid_softc *sc = (struct uhid_softc *)addr; 264 265 #ifdef UHID_DEBUG 266 if (uhiddebug > 5) { 267 uint32_t i; 268 269 DPRINTF(("uhid_intr: data =")); 270 for (i = 0; i < len; i++) 271 DPRINTF((" %02x", ((u_char *)data)[i])); 272 DPRINTF(("\n")); 273 } 274 #endif 275 276 mutex_enter(&sc->sc_lock); 277 (void)b_to_q(data, len, &sc->sc_q); 278 279 if (sc->sc_state & UHID_ASLP) { 280 sc->sc_state &= ~UHID_ASLP; 281 DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); 282 cv_broadcast(&sc->sc_cv); 283 } 284 selnotify(&sc->sc_rsel, 0, 0); 285 if (sc->sc_async != NULL) { 286 DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async)); 287 softint_schedule(sc->sc_sih); 288 } 289 mutex_exit(&sc->sc_lock); 290 } 291 292 void 293 uhid_softintr(void *cookie) 294 { 295 struct uhid_softc *sc; 296 297 sc = cookie; 298 299 mutex_enter(proc_lock); 300 if (sc->sc_async != NULL) 301 psignal(sc->sc_async, SIGIO); 302 mutex_exit(proc_lock); 303 } 304 305 int 306 uhidopen(dev_t dev, int flag, int mode, struct lwp *l) 307 { 308 struct uhid_softc *sc; 309 int error; 310 311 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 312 if (sc == NULL) 313 return ENXIO; 314 315 DPRINTF(("uhidopen: sc=%p\n", sc)); 316 317 if (sc->sc_dying) 318 return ENXIO; 319 320 mutex_enter(&sc->sc_access_lock); 321 322 /* 323 * uhid interrupts aren't enabled yet, so setup sc_q now, as 324 * long as they're not already allocated. 325 */ 326 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 327 mutex_exit(&sc->sc_access_lock); 328 return EBUSY; 329 } 330 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 331 mutex_exit(&sc->sc_access_lock); 332 return ENOMEM; 333 } 334 335 error = uhidev_open(&sc->sc_hdev); 336 if (error) { 337 clfree(&sc->sc_q); 338 mutex_exit(&sc->sc_access_lock); 339 return error; 340 } 341 mutex_exit(&sc->sc_access_lock); 342 343 if (sc->sc_osize > 0) 344 sc->sc_obuf = kmem_alloc(sc->sc_osize, KM_SLEEP); 345 else 346 sc->sc_obuf = NULL; 347 sc->sc_state &= ~UHID_IMMED; 348 349 mutex_enter(proc_lock); 350 sc->sc_async = NULL; 351 mutex_exit(proc_lock); 352 353 return 0; 354 } 355 356 int 357 uhidclose(dev_t dev, int flag, int mode, struct lwp *l) 358 { 359 struct uhid_softc *sc; 360 361 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 362 363 DPRINTF(("uhidclose: sc=%p\n", sc)); 364 365 mutex_enter(proc_lock); 366 sc->sc_async = NULL; 367 mutex_exit(proc_lock); 368 369 mutex_enter(&sc->sc_access_lock); 370 371 uhidev_stop(&sc->sc_hdev); 372 373 clfree(&sc->sc_q); 374 if (sc->sc_osize > 0) 375 kmem_free(sc->sc_obuf, sc->sc_osize); 376 377 uhidev_close(&sc->sc_hdev); 378 379 mutex_exit(&sc->sc_access_lock); 380 381 return 0; 382 } 383 384 int 385 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 386 { 387 int error = 0; 388 int extra; 389 size_t length; 390 u_char buffer[UHID_CHUNK]; 391 usbd_status err; 392 393 DPRINTFN(1, ("uhidread\n")); 394 if (sc->sc_state & UHID_IMMED) { 395 DPRINTFN(1, ("uhidread immed\n")); 396 extra = sc->sc_hdev.sc_report_id != 0; 397 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 398 buffer, sc->sc_isize + extra); 399 if (err) 400 return EIO; 401 return uiomove(buffer+extra, sc->sc_isize, uio); 402 } 403 404 mutex_enter(&sc->sc_lock); 405 while (sc->sc_q.c_cc == 0) { 406 if (flag & IO_NDELAY) { 407 mutex_exit(&sc->sc_lock); 408 return EWOULDBLOCK; 409 } 410 sc->sc_state |= UHID_ASLP; 411 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 412 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 413 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 414 if (sc->sc_dying) 415 error = EIO; 416 if (error) { 417 sc->sc_state &= ~UHID_ASLP; 418 break; 419 } 420 } 421 422 /* Transfer as many chunks as possible. */ 423 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 424 length = min(sc->sc_q.c_cc, uio->uio_resid); 425 if (length > sizeof(buffer)) 426 length = sizeof(buffer); 427 428 /* Remove a small chunk from the input queue. */ 429 (void) q_to_b(&sc->sc_q, buffer, length); 430 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 431 432 /* Copy the data to the user process. */ 433 mutex_exit(&sc->sc_lock); 434 if ((error = uiomove(buffer, length, uio)) != 0) 435 return error; 436 mutex_enter(&sc->sc_lock); 437 } 438 439 mutex_exit(&sc->sc_lock); 440 return error; 441 } 442 443 int 444 uhidread(dev_t dev, struct uio *uio, int flag) 445 { 446 struct uhid_softc *sc; 447 int error; 448 449 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 450 451 mutex_enter(&sc->sc_lock); 452 sc->sc_refcnt++; 453 mutex_exit(&sc->sc_lock); 454 455 mutex_enter(&sc->sc_access_lock); 456 error = uhid_do_read(sc, uio, flag); 457 mutex_exit(&sc->sc_access_lock); 458 459 mutex_enter(&sc->sc_lock); 460 if (--sc->sc_refcnt < 0) 461 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 462 mutex_exit(&sc->sc_lock); 463 return error; 464 } 465 466 int 467 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 468 { 469 int error; 470 int size; 471 usbd_status err; 472 473 DPRINTFN(1, ("uhidwrite\n")); 474 475 if (sc->sc_dying) 476 return EIO; 477 478 size = sc->sc_osize; 479 error = 0; 480 if (uio->uio_resid != size || size == 0) 481 return EINVAL; 482 error = uiomove(sc->sc_obuf, size, uio); 483 if (!error) { 484 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 485 sc->sc_obuf, size); 486 if (err) 487 error = EIO; 488 } 489 490 return error; 491 } 492 493 int 494 uhidwrite(dev_t dev, struct uio *uio, int flag) 495 { 496 struct uhid_softc *sc; 497 int error; 498 499 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 500 501 mutex_enter(&sc->sc_lock); 502 sc->sc_refcnt++; 503 mutex_exit(&sc->sc_lock); 504 505 mutex_enter(&sc->sc_access_lock); 506 error = uhid_do_write(sc, uio, flag); 507 mutex_exit(&sc->sc_access_lock); 508 509 mutex_enter(&sc->sc_lock); 510 if (--sc->sc_refcnt < 0) 511 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 512 mutex_exit(&sc->sc_lock); 513 return error; 514 } 515 516 int 517 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr, 518 int flag, struct lwp *l) 519 { 520 struct usb_ctl_report_desc *rd; 521 struct usb_ctl_report *re; 522 u_char buffer[UHID_CHUNK]; 523 int size, extra; 524 usbd_status err; 525 void *desc; 526 527 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 528 529 if (sc->sc_dying) 530 return EIO; 531 532 switch (cmd) { 533 case FIONBIO: 534 /* All handled in the upper FS layer. */ 535 break; 536 537 case FIOASYNC: 538 mutex_enter(proc_lock); 539 if (*(int *)addr) { 540 if (sc->sc_async != NULL) 541 return EBUSY; 542 sc->sc_async = l->l_proc; 543 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 544 } else 545 sc->sc_async = NULL; 546 mutex_exit(proc_lock); 547 break; 548 549 /* XXX this is not the most general solution. */ 550 case TIOCSPGRP: 551 mutex_enter(proc_lock); 552 if (sc->sc_async == NULL) { 553 mutex_exit(proc_lock); 554 return EINVAL; 555 } 556 if (*(int *)addr != sc->sc_async->p_pgid) { 557 mutex_exit(proc_lock); 558 return EPERM; 559 } 560 mutex_exit(proc_lock); 561 break; 562 563 case FIOSETOWN: 564 mutex_enter(proc_lock); 565 if (sc->sc_async == NULL) { 566 mutex_exit(proc_lock); 567 return EINVAL; 568 } 569 if (-*(int *)addr != sc->sc_async->p_pgid 570 && *(int *)addr != sc->sc_async->p_pid) { 571 mutex_exit(proc_lock); 572 return EPERM; 573 } 574 mutex_exit(proc_lock); 575 break; 576 577 case USB_GET_REPORT_DESC: 578 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 579 rd = (struct usb_ctl_report_desc *)addr; 580 size = min(size, sizeof(rd->ucrd_data)); 581 rd->ucrd_size = size; 582 memcpy(rd->ucrd_data, desc, size); 583 break; 584 585 case USB_SET_IMMED: 586 if (*(int *)addr) { 587 extra = sc->sc_hdev.sc_report_id != 0; 588 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 589 buffer, sc->sc_isize + extra); 590 if (err) 591 return EOPNOTSUPP; 592 593 sc->sc_state |= UHID_IMMED; 594 } else 595 sc->sc_state &= ~UHID_IMMED; 596 break; 597 598 case USB_GET_REPORT: 599 re = (struct usb_ctl_report *)addr; 600 switch (re->ucr_report) { 601 case UHID_INPUT_REPORT: 602 size = sc->sc_isize; 603 break; 604 case UHID_OUTPUT_REPORT: 605 size = sc->sc_osize; 606 break; 607 case UHID_FEATURE_REPORT: 608 size = sc->sc_fsize; 609 break; 610 default: 611 return EINVAL; 612 } 613 extra = sc->sc_hdev.sc_report_id != 0; 614 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 615 re->ucr_data, size + extra); 616 if (extra) 617 memcpy(re->ucr_data, re->ucr_data+1, size); 618 if (err) 619 return EIO; 620 break; 621 622 case USB_SET_REPORT: 623 re = (struct usb_ctl_report *)addr; 624 switch (re->ucr_report) { 625 case UHID_INPUT_REPORT: 626 size = sc->sc_isize; 627 break; 628 case UHID_OUTPUT_REPORT: 629 size = sc->sc_osize; 630 break; 631 case UHID_FEATURE_REPORT: 632 size = sc->sc_fsize; 633 break; 634 default: 635 return EINVAL; 636 } 637 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 638 re->ucr_data, size); 639 if (err) 640 return EIO; 641 break; 642 643 case USB_GET_REPORT_ID: 644 *(int *)addr = sc->sc_hdev.sc_report_id; 645 break; 646 647 case USB_GET_DEVICE_DESC: 648 *(usb_device_descriptor_t *)addr = 649 *usbd_get_device_descriptor(sc->sc_hdev.sc_parent->sc_udev); 650 break; 651 652 case USB_GET_DEVICEINFO: 653 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 654 (struct usb_device_info *)addr, 0); 655 break; 656 #ifdef COMPAT_30 657 case USB_GET_DEVICEINFO_OLD: 658 usbd_fill_deviceinfo_old(sc->sc_hdev.sc_parent->sc_udev, 659 (struct usb_device_info_old *)addr, 0); 660 661 break; 662 #endif 663 case USB_GET_STRING_DESC: 664 { 665 struct usb_string_desc *si = (struct usb_string_desc *)addr; 666 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 667 si->usd_string_index, 668 si->usd_language_id, &si->usd_desc, &size); 669 if (err) 670 return EINVAL; 671 break; 672 } 673 674 default: 675 return EINVAL; 676 } 677 return 0; 678 } 679 680 int 681 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 682 { 683 struct uhid_softc *sc; 684 int error; 685 686 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 687 if (sc == NULL) 688 return ENXIO; 689 690 if (sc->sc_dying) 691 return EIO; 692 693 mutex_enter(&sc->sc_lock); 694 sc->sc_refcnt++; 695 mutex_exit(&sc->sc_lock); 696 697 mutex_enter(&sc->sc_access_lock); 698 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 699 mutex_exit(&sc->sc_access_lock); 700 701 mutex_enter(&sc->sc_lock); 702 if (--sc->sc_refcnt < 0) 703 usb_detach_broadcast(sc->sc_hdev.sc_dev, &sc->sc_detach_cv); 704 mutex_exit(&sc->sc_lock); 705 return error; 706 } 707 708 int 709 uhidpoll(dev_t dev, int events, struct lwp *l) 710 { 711 struct uhid_softc *sc; 712 int revents = 0; 713 714 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 715 if (sc == NULL) 716 return ENXIO; 717 718 if (sc->sc_dying) 719 return EIO; 720 721 mutex_enter(&sc->sc_lock); 722 if (events & (POLLOUT | POLLWRNORM)) 723 revents |= events & (POLLOUT | POLLWRNORM); 724 if (events & (POLLIN | POLLRDNORM)) { 725 if (sc->sc_q.c_cc > 0) 726 revents |= events & (POLLIN | POLLRDNORM); 727 else 728 selrecord(l, &sc->sc_rsel); 729 } 730 mutex_exit(&sc->sc_lock); 731 732 return revents; 733 } 734 735 static void 736 filt_uhidrdetach(struct knote *kn) 737 { 738 struct uhid_softc *sc = kn->kn_hook; 739 740 mutex_enter(&sc->sc_lock); 741 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 742 mutex_exit(&sc->sc_lock); 743 } 744 745 static int 746 filt_uhidread(struct knote *kn, long hint) 747 { 748 struct uhid_softc *sc = kn->kn_hook; 749 750 kn->kn_data = sc->sc_q.c_cc; 751 return kn->kn_data > 0; 752 } 753 754 static const struct filterops uhidread_filtops = 755 { 1, NULL, filt_uhidrdetach, filt_uhidread }; 756 757 static const struct filterops uhid_seltrue_filtops = 758 { 1, NULL, filt_uhidrdetach, filt_seltrue }; 759 760 int 761 uhidkqfilter(dev_t dev, struct knote *kn) 762 { 763 struct uhid_softc *sc; 764 struct klist *klist; 765 766 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 767 768 if (sc->sc_dying) 769 return ENXIO; 770 771 switch (kn->kn_filter) { 772 case EVFILT_READ: 773 klist = &sc->sc_rsel.sel_klist; 774 kn->kn_fop = &uhidread_filtops; 775 break; 776 777 case EVFILT_WRITE: 778 klist = &sc->sc_rsel.sel_klist; 779 kn->kn_fop = &uhid_seltrue_filtops; 780 break; 781 782 default: 783 return EINVAL; 784 } 785 786 kn->kn_hook = sc; 787 788 mutex_enter(&sc->sc_lock); 789 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 790 mutex_exit(&sc->sc_lock); 791 792 return 0; 793 } 794
Indexes created Thu Oct 02 14:10:14 GMT 2025