uhid.c revision 1.106
1 /* $NetBSD: uhid.c,v 1.106 2019/03/01 11:06:56 pgoyette 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 1.106 2019/03/01 11:06:56 pgoyette 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 #include <sys/compat_stub.h> 61 62 #include <dev/usb/usb.h> 63 #include <dev/usb/usbhid.h> 64 65 #include <dev/usb/usbdevs.h> 66 #include <dev/usb/usbdi.h> 67 #include <dev/usb/usbdi_util.h> 68 #include <dev/usb/usb_quirks.h> 69 #include <dev/hid/hid.h> 70 71 #include <dev/usb/uhidev.h> 72 73 #ifdef UHID_DEBUG 74 #define DPRINTF(x) if (uhiddebug) printf x 75 #define DPRINTFN(n,x) if (uhiddebug>(n)) printf x 76 int uhiddebug = 0; 77 #else 78 #define DPRINTF(x) 79 #define DPRINTFN(n,x) 80 #endif 81 82 struct uhid_softc { 83 struct uhidev sc_hdev; 84 85 kmutex_t sc_access_lock; /* serialises syscall accesses */ 86 kmutex_t sc_lock; /* protects refcnt, others */ 87 kcondvar_t sc_cv; 88 kcondvar_t sc_detach_cv; 89 90 int sc_isize; 91 int sc_osize; 92 int sc_fsize; 93 94 u_char *sc_obuf; 95 96 struct clist sc_q; /* protected by sc_lock */ 97 struct selinfo sc_rsel; 98 proc_t *sc_async; /* process that wants SIGIO */ 99 void *sc_sih; 100 u_char sc_state; /* driver state */ 101 #define UHID_ASLP 0x01 /* waiting for device data */ 102 #define UHID_IMMED 0x02 /* return read data immediately */ 103 104 int sc_refcnt; 105 u_char sc_dying; 106 }; 107 108 #define UHIDUNIT(dev) (minor(dev)) 109 #define UHID_CHUNK 128 /* chunk size for read */ 110 #define UHID_BSIZE 1020 /* buffer size */ 111 112 dev_type_open(uhidopen); 113 dev_type_close(uhidclose); 114 dev_type_read(uhidread); 115 dev_type_write(uhidwrite); 116 dev_type_ioctl(uhidioctl); 117 dev_type_poll(uhidpoll); 118 dev_type_kqfilter(uhidkqfilter); 119 120 const struct cdevsw uhid_cdevsw = { 121 .d_open = uhidopen, 122 .d_close = uhidclose, 123 .d_read = uhidread, 124 .d_write = uhidwrite, 125 .d_ioctl = uhidioctl, 126 .d_stop = nostop, 127 .d_tty = notty, 128 .d_poll = uhidpoll, 129 .d_mmap = nommap, 130 .d_kqfilter = uhidkqfilter, 131 .d_discard = nodiscard, 132 .d_flag = D_OTHER 133 }; 134 135 Static void uhid_intr(struct uhidev *, void *, u_int); 136 Static void uhid_softintr(void *); 137 138 Static int uhid_do_read(struct uhid_softc *, struct uio *, int); 139 Static int uhid_do_write(struct uhid_softc *, struct uio *, int); 140 Static int uhid_do_ioctl(struct uhid_softc*, u_long, void *, int, struct lwp *); 141 142 int uhid_match(device_t, cfdata_t, void *); 143 void uhid_attach(device_t, device_t, void *); 144 int uhid_detach(device_t, int); 145 int uhid_activate(device_t, enum devact); 146 extern struct cfdriver uhid_cd; 147 CFATTACH_DECL_NEW(uhid, sizeof(struct uhid_softc), uhid_match, uhid_attach, 148 uhid_detach, uhid_activate); 149 150 int 151 uhid_match(device_t parent, cfdata_t match, void *aux) 152 { 153 #ifdef UHID_DEBUG 154 struct uhidev_attach_arg *uha = aux; 155 #endif 156 157 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 158 159 if (match->cf_flags & 1) 160 return UMATCH_HIGHEST; 161 else 162 return UMATCH_IFACECLASS_GENERIC; 163 } 164 165 void 166 uhid_attach(device_t parent, device_t self, void *aux) 167 { 168 struct uhid_softc *sc = device_private(self); 169 struct uhidev_attach_arg *uha = aux; 170 int size, repid; 171 void *desc; 172 173 sc->sc_hdev.sc_dev = self; 174 selinit(&sc->sc_rsel); 175 sc->sc_hdev.sc_intr = uhid_intr; 176 sc->sc_hdev.sc_parent = uha->parent; 177 sc->sc_hdev.sc_report_id = uha->reportid; 178 sc->sc_sih = softint_establish(SOFTINT_CLOCK, uhid_softintr, sc); 179 180 uhidev_get_report_desc(uha->parent, &desc, &size); 181 repid = uha->reportid; 182 sc->sc_isize = hid_report_size(desc, size, hid_input, repid); 183 sc->sc_osize = hid_report_size(desc, size, hid_output, repid); 184 sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid); 185 186 aprint_naive("\n"); 187 aprint_normal(": input=%d, output=%d, feature=%d\n", 188 sc->sc_isize, sc->sc_osize, sc->sc_fsize); 189 190 mutex_init(&sc->sc_access_lock, MUTEX_DEFAULT, IPL_NONE); 191 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_SOFTUSB); 192 cv_init(&sc->sc_cv, "uhidrea"); 193 cv_init(&sc->sc_detach_cv, "uhiddet"); 194 195 if (!pmf_device_register(self, NULL, NULL)) 196 aprint_error_dev(self, "couldn't establish power handler\n"); 197 198 return; 199 } 200 201 int 202 uhid_activate(device_t self, enum devact act) 203 { 204 struct uhid_softc *sc = device_private(self); 205 206 switch (act) { 207 case DVACT_DEACTIVATE: 208 sc->sc_dying = 1; 209 return 0; 210 default: 211 return EOPNOTSUPP; 212 } 213 } 214 215 int 216 uhid_detach(device_t self, int flags) 217 { 218 struct uhid_softc *sc = device_private(self); 219 int maj, mn; 220 221 DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); 222 223 sc->sc_dying = 1; 224 225 pmf_device_deregister(self); 226 227 mutex_enter(&sc->sc_lock); 228 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 229 if (--sc->sc_refcnt >= 0) { 230 /* Wake everyone */ 231 cv_broadcast(&sc->sc_cv); 232 /* Wait for processes to go away. */ 233 if (cv_timedwait(&sc->sc_detach_cv, &sc->sc_lock, hz * 60)) 234 aprint_error_dev(self, ": didn't detach\n"); 235 } 236 } 237 mutex_exit(&sc->sc_lock); 238 239 /* locate the major number */ 240 maj = cdevsw_lookup_major(&uhid_cdevsw); 241 242 /* Nuke the vnodes for any open instances (calls close). */ 243 mn = device_unit(self); 244 vdevgone(maj, mn, mn, VCHR); 245 246 #if 0 247 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, 248 sc->sc_hdev.sc_parent->sc_udev, 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 = uimin(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 cv_broadcast(&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 cv_broadcast(&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 = uimin(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 memmove(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 case USB_GET_DEVICEINFO_OLD: 657 MODULE_HOOK_CALL(usb_subr_fill_30_hook, 658 (sc->sc_hdev.sc_parent->sc_udev, 659 (struct usb_device_info_old *)addr, 0, 660 usbd_devinfo_vp, usbd_printBCD), 661 enosys(), err); 662 if (err == 0) 663 return 0; 664 break; 665 case USB_GET_STRING_DESC: 666 { 667 struct usb_string_desc *si = (struct usb_string_desc *)addr; 668 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 669 si->usd_string_index, 670 si->usd_language_id, &si->usd_desc, &size); 671 if (err) 672 return EINVAL; 673 break; 674 } 675 676 default: 677 return EINVAL; 678 } 679 return 0; 680 } 681 682 int 683 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 684 { 685 struct uhid_softc *sc; 686 int error; 687 688 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 689 if (sc == NULL) 690 return ENXIO; 691 692 if (sc->sc_dying) 693 return EIO; 694 695 mutex_enter(&sc->sc_lock); 696 sc->sc_refcnt++; 697 mutex_exit(&sc->sc_lock); 698 699 mutex_enter(&sc->sc_access_lock); 700 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 701 mutex_exit(&sc->sc_access_lock); 702 703 mutex_enter(&sc->sc_lock); 704 if (--sc->sc_refcnt < 0) 705 cv_broadcast(&sc->sc_detach_cv); 706 mutex_exit(&sc->sc_lock); 707 return error; 708 } 709 710 int 711 uhidpoll(dev_t dev, int events, struct lwp *l) 712 { 713 struct uhid_softc *sc; 714 int revents = 0; 715 716 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 717 if (sc == NULL) 718 return ENXIO; 719 720 if (sc->sc_dying) 721 return EIO; 722 723 mutex_enter(&sc->sc_lock); 724 if (events & (POLLOUT | POLLWRNORM)) 725 revents |= events & (POLLOUT | POLLWRNORM); 726 if (events & (POLLIN | POLLRDNORM)) { 727 if (sc->sc_q.c_cc > 0) 728 revents |= events & (POLLIN | POLLRDNORM); 729 else 730 selrecord(l, &sc->sc_rsel); 731 } 732 mutex_exit(&sc->sc_lock); 733 734 return revents; 735 } 736 737 static void 738 filt_uhidrdetach(struct knote *kn) 739 { 740 struct uhid_softc *sc = kn->kn_hook; 741 742 mutex_enter(&sc->sc_lock); 743 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 744 mutex_exit(&sc->sc_lock); 745 } 746 747 static int 748 filt_uhidread(struct knote *kn, long hint) 749 { 750 struct uhid_softc *sc = kn->kn_hook; 751 752 kn->kn_data = sc->sc_q.c_cc; 753 return kn->kn_data > 0; 754 } 755 756 static const struct filterops uhidread_filtops = { 757 .f_isfd = 1, 758 .f_attach = NULL, 759 .f_detach = filt_uhidrdetach, 760 .f_event = filt_uhidread, 761 }; 762 763 static const struct filterops uhid_seltrue_filtops = { 764 .f_isfd = 1, 765 .f_attach = NULL, 766 .f_detach = filt_uhidrdetach, 767 .f_event = filt_seltrue, 768 }; 769 770 int 771 uhidkqfilter(dev_t dev, struct knote *kn) 772 { 773 struct uhid_softc *sc; 774 struct klist *klist; 775 776 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 777 778 if (sc->sc_dying) 779 return ENXIO; 780 781 switch (kn->kn_filter) { 782 case EVFILT_READ: 783 klist = &sc->sc_rsel.sel_klist; 784 kn->kn_fop = &uhidread_filtops; 785 break; 786 787 case EVFILT_WRITE: 788 klist = &sc->sc_rsel.sel_klist; 789 kn->kn_fop = &uhid_seltrue_filtops; 790 break; 791 792 default: 793 return EINVAL; 794 } 795 796 kn->kn_hook = sc; 797 798 mutex_enter(&sc->sc_lock); 799 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 800 mutex_exit(&sc->sc_lock); 801 802 return 0; 803 } 804
Indexes created Thu Oct 02 14:10:14 GMT 2025