uhid.c revision 1.107
1 /* $NetBSD: uhid.c,v 1.107 2019/03/23 02:19:31 mrg 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 1.107 2019/03/23 02:19:31 mrg 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_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_lock); 328 return EBUSY; 329 } 330 mutex_exit(&sc->sc_lock); 331 332 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 333 return ENOMEM; 334 } 335 336 mutex_enter(&sc->sc_access_lock); 337 error = uhidev_open(&sc->sc_hdev); 338 if (error) { 339 clfree(&sc->sc_q); 340 mutex_exit(&sc->sc_access_lock); 341 return error; 342 } 343 mutex_exit(&sc->sc_access_lock); 344 345 if (sc->sc_osize > 0) 346 sc->sc_obuf = kmem_alloc(sc->sc_osize, KM_SLEEP); 347 else 348 sc->sc_obuf = NULL; 349 sc->sc_state &= ~UHID_IMMED; 350 351 mutex_enter(proc_lock); 352 sc->sc_async = NULL; 353 mutex_exit(proc_lock); 354 355 return 0; 356 } 357 358 int 359 uhidclose(dev_t dev, int flag, int mode, struct lwp *l) 360 { 361 struct uhid_softc *sc; 362 363 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 364 365 DPRINTF(("uhidclose: sc=%p\n", sc)); 366 367 mutex_enter(proc_lock); 368 sc->sc_async = NULL; 369 mutex_exit(proc_lock); 370 371 mutex_enter(&sc->sc_access_lock); 372 373 uhidev_stop(&sc->sc_hdev); 374 375 clfree(&sc->sc_q); 376 if (sc->sc_osize > 0) 377 kmem_free(sc->sc_obuf, sc->sc_osize); 378 379 uhidev_close(&sc->sc_hdev); 380 381 mutex_exit(&sc->sc_access_lock); 382 383 return 0; 384 } 385 386 int 387 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 388 { 389 int error = 0; 390 int extra; 391 size_t length; 392 u_char buffer[UHID_CHUNK]; 393 usbd_status err; 394 395 DPRINTFN(1, ("uhidread\n")); 396 if (sc->sc_state & UHID_IMMED) { 397 DPRINTFN(1, ("uhidread immed\n")); 398 extra = sc->sc_hdev.sc_report_id != 0; 399 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 400 buffer, sc->sc_isize + extra); 401 if (err) 402 return EIO; 403 return uiomove(buffer+extra, sc->sc_isize, uio); 404 } 405 406 mutex_enter(&sc->sc_lock); 407 while (sc->sc_q.c_cc == 0) { 408 if (flag & IO_NDELAY) { 409 mutex_exit(&sc->sc_lock); 410 return EWOULDBLOCK; 411 } 412 sc->sc_state |= UHID_ASLP; 413 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 414 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 415 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 416 if (sc->sc_dying) 417 error = EIO; 418 if (error) { 419 sc->sc_state &= ~UHID_ASLP; 420 break; 421 } 422 } 423 424 /* Transfer as many chunks as possible. */ 425 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 426 length = uimin(sc->sc_q.c_cc, uio->uio_resid); 427 if (length > sizeof(buffer)) 428 length = sizeof(buffer); 429 430 /* Remove a small chunk from the input queue. */ 431 (void) q_to_b(&sc->sc_q, buffer, length); 432 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 433 434 /* Copy the data to the user process. */ 435 mutex_exit(&sc->sc_lock); 436 if ((error = uiomove(buffer, length, uio)) != 0) 437 return error; 438 mutex_enter(&sc->sc_lock); 439 } 440 441 mutex_exit(&sc->sc_lock); 442 return error; 443 } 444 445 int 446 uhidread(dev_t dev, struct uio *uio, int flag) 447 { 448 struct uhid_softc *sc; 449 int error; 450 451 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 452 453 mutex_enter(&sc->sc_lock); 454 sc->sc_refcnt++; 455 mutex_exit(&sc->sc_lock); 456 457 mutex_enter(&sc->sc_access_lock); 458 error = uhid_do_read(sc, uio, flag); 459 mutex_exit(&sc->sc_access_lock); 460 461 mutex_enter(&sc->sc_lock); 462 if (--sc->sc_refcnt < 0) 463 cv_broadcast(&sc->sc_detach_cv); 464 mutex_exit(&sc->sc_lock); 465 return error; 466 } 467 468 int 469 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 470 { 471 int error; 472 int size; 473 usbd_status err; 474 475 DPRINTFN(1, ("uhidwrite\n")); 476 477 if (sc->sc_dying) 478 return EIO; 479 480 size = sc->sc_osize; 481 error = 0; 482 if (uio->uio_resid != size || size == 0) 483 return EINVAL; 484 error = uiomove(sc->sc_obuf, size, uio); 485 if (!error) { 486 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 487 sc->sc_obuf, size); 488 if (err) 489 error = EIO; 490 } 491 492 return error; 493 } 494 495 int 496 uhidwrite(dev_t dev, struct uio *uio, int flag) 497 { 498 struct uhid_softc *sc; 499 int error; 500 501 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 502 503 mutex_enter(&sc->sc_lock); 504 sc->sc_refcnt++; 505 mutex_exit(&sc->sc_lock); 506 507 mutex_enter(&sc->sc_access_lock); 508 error = uhid_do_write(sc, uio, flag); 509 mutex_exit(&sc->sc_access_lock); 510 511 mutex_enter(&sc->sc_lock); 512 if (--sc->sc_refcnt < 0) 513 cv_broadcast(&sc->sc_detach_cv); 514 mutex_exit(&sc->sc_lock); 515 return error; 516 } 517 518 int 519 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr, 520 int flag, struct lwp *l) 521 { 522 struct usb_ctl_report_desc *rd; 523 struct usb_ctl_report *re; 524 u_char buffer[UHID_CHUNK]; 525 int size, extra; 526 usbd_status err; 527 void *desc; 528 529 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 530 531 if (sc->sc_dying) 532 return EIO; 533 534 switch (cmd) { 535 case FIONBIO: 536 /* All handled in the upper FS layer. */ 537 break; 538 539 case FIOASYNC: 540 mutex_enter(proc_lock); 541 if (*(int *)addr) { 542 if (sc->sc_async != NULL) 543 return EBUSY; 544 sc->sc_async = l->l_proc; 545 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 546 } else 547 sc->sc_async = NULL; 548 mutex_exit(proc_lock); 549 break; 550 551 /* XXX this is not the most general solution. */ 552 case TIOCSPGRP: 553 mutex_enter(proc_lock); 554 if (sc->sc_async == NULL) { 555 mutex_exit(proc_lock); 556 return EINVAL; 557 } 558 if (*(int *)addr != sc->sc_async->p_pgid) { 559 mutex_exit(proc_lock); 560 return EPERM; 561 } 562 mutex_exit(proc_lock); 563 break; 564 565 case FIOSETOWN: 566 mutex_enter(proc_lock); 567 if (sc->sc_async == NULL) { 568 mutex_exit(proc_lock); 569 return EINVAL; 570 } 571 if (-*(int *)addr != sc->sc_async->p_pgid 572 && *(int *)addr != sc->sc_async->p_pid) { 573 mutex_exit(proc_lock); 574 return EPERM; 575 } 576 mutex_exit(proc_lock); 577 break; 578 579 case USB_GET_REPORT_DESC: 580 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 581 rd = (struct usb_ctl_report_desc *)addr; 582 size = uimin(size, sizeof(rd->ucrd_data)); 583 rd->ucrd_size = size; 584 memcpy(rd->ucrd_data, desc, size); 585 break; 586 587 case USB_SET_IMMED: 588 if (*(int *)addr) { 589 extra = sc->sc_hdev.sc_report_id != 0; 590 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 591 buffer, sc->sc_isize + extra); 592 if (err) 593 return EOPNOTSUPP; 594 595 sc->sc_state |= UHID_IMMED; 596 } else 597 sc->sc_state &= ~UHID_IMMED; 598 break; 599 600 case USB_GET_REPORT: 601 re = (struct usb_ctl_report *)addr; 602 switch (re->ucr_report) { 603 case UHID_INPUT_REPORT: 604 size = sc->sc_isize; 605 break; 606 case UHID_OUTPUT_REPORT: 607 size = sc->sc_osize; 608 break; 609 case UHID_FEATURE_REPORT: 610 size = sc->sc_fsize; 611 break; 612 default: 613 return EINVAL; 614 } 615 extra = sc->sc_hdev.sc_report_id != 0; 616 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 617 re->ucr_data, size + extra); 618 if (extra) 619 memmove(re->ucr_data, re->ucr_data+1, size); 620 if (err) 621 return EIO; 622 break; 623 624 case USB_SET_REPORT: 625 re = (struct usb_ctl_report *)addr; 626 switch (re->ucr_report) { 627 case UHID_INPUT_REPORT: 628 size = sc->sc_isize; 629 break; 630 case UHID_OUTPUT_REPORT: 631 size = sc->sc_osize; 632 break; 633 case UHID_FEATURE_REPORT: 634 size = sc->sc_fsize; 635 break; 636 default: 637 return EINVAL; 638 } 639 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 640 re->ucr_data, size); 641 if (err) 642 return EIO; 643 break; 644 645 case USB_GET_REPORT_ID: 646 *(int *)addr = sc->sc_hdev.sc_report_id; 647 break; 648 649 case USB_GET_DEVICE_DESC: 650 *(usb_device_descriptor_t *)addr = 651 *usbd_get_device_descriptor(sc->sc_hdev.sc_parent->sc_udev); 652 break; 653 654 case USB_GET_DEVICEINFO: 655 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 656 (struct usb_device_info *)addr, 0); 657 break; 658 case USB_GET_DEVICEINFO_OLD: 659 MODULE_HOOK_CALL(usb_subr_fill_30_hook, 660 (sc->sc_hdev.sc_parent->sc_udev, 661 (struct usb_device_info_old *)addr, 0, 662 usbd_devinfo_vp, usbd_printBCD), 663 enosys(), err); 664 if (err == 0) 665 return 0; 666 break; 667 case USB_GET_STRING_DESC: 668 { 669 struct usb_string_desc *si = (struct usb_string_desc *)addr; 670 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 671 si->usd_string_index, 672 si->usd_language_id, &si->usd_desc, &size); 673 if (err) 674 return EINVAL; 675 break; 676 } 677 678 default: 679 return EINVAL; 680 } 681 return 0; 682 } 683 684 int 685 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 686 { 687 struct uhid_softc *sc; 688 int error; 689 690 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 691 if (sc == NULL) 692 return ENXIO; 693 694 if (sc->sc_dying) 695 return EIO; 696 697 mutex_enter(&sc->sc_lock); 698 sc->sc_refcnt++; 699 mutex_exit(&sc->sc_lock); 700 701 mutex_enter(&sc->sc_access_lock); 702 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 703 mutex_exit(&sc->sc_access_lock); 704 705 mutex_enter(&sc->sc_lock); 706 if (--sc->sc_refcnt < 0) 707 cv_broadcast(&sc->sc_detach_cv); 708 mutex_exit(&sc->sc_lock); 709 return error; 710 } 711 712 int 713 uhidpoll(dev_t dev, int events, struct lwp *l) 714 { 715 struct uhid_softc *sc; 716 int revents = 0; 717 718 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 719 if (sc == NULL) 720 return ENXIO; 721 722 if (sc->sc_dying) 723 return EIO; 724 725 mutex_enter(&sc->sc_lock); 726 if (events & (POLLOUT | POLLWRNORM)) 727 revents |= events & (POLLOUT | POLLWRNORM); 728 if (events & (POLLIN | POLLRDNORM)) { 729 if (sc->sc_q.c_cc > 0) 730 revents |= events & (POLLIN | POLLRDNORM); 731 else 732 selrecord(l, &sc->sc_rsel); 733 } 734 mutex_exit(&sc->sc_lock); 735 736 return revents; 737 } 738 739 static void 740 filt_uhidrdetach(struct knote *kn) 741 { 742 struct uhid_softc *sc = kn->kn_hook; 743 744 mutex_enter(&sc->sc_lock); 745 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 746 mutex_exit(&sc->sc_lock); 747 } 748 749 static int 750 filt_uhidread(struct knote *kn, long hint) 751 { 752 struct uhid_softc *sc = kn->kn_hook; 753 754 kn->kn_data = sc->sc_q.c_cc; 755 return kn->kn_data > 0; 756 } 757 758 static const struct filterops uhidread_filtops = { 759 .f_isfd = 1, 760 .f_attach = NULL, 761 .f_detach = filt_uhidrdetach, 762 .f_event = filt_uhidread, 763 }; 764 765 static const struct filterops uhid_seltrue_filtops = { 766 .f_isfd = 1, 767 .f_attach = NULL, 768 .f_detach = filt_uhidrdetach, 769 .f_event = filt_seltrue, 770 }; 771 772 int 773 uhidkqfilter(dev_t dev, struct knote *kn) 774 { 775 struct uhid_softc *sc; 776 struct klist *klist; 777 778 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 779 780 if (sc->sc_dying) 781 return ENXIO; 782 783 switch (kn->kn_filter) { 784 case EVFILT_READ: 785 klist = &sc->sc_rsel.sel_klist; 786 kn->kn_fop = &uhidread_filtops; 787 break; 788 789 case EVFILT_WRITE: 790 klist = &sc->sc_rsel.sel_klist; 791 kn->kn_fop = &uhid_seltrue_filtops; 792 break; 793 794 default: 795 return EINVAL; 796 } 797 798 kn->kn_hook = sc; 799 800 mutex_enter(&sc->sc_lock); 801 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 802 mutex_exit(&sc->sc_lock); 803 804 return 0; 805 } 806
Indexes created Tue Sep 23 02:09:52 GMT 2025