uhid.c revision 1.110
1 /* $NetBSD: uhid.c,v 1.110 2019/12/01 12:47:10 maxv 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 1.110 2019/12/01 12:47:10 maxv 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 #include "ioconf.h" 74 75 #ifdef UHID_DEBUG 76 #define DPRINTF(x) if (uhiddebug) printf x 77 #define DPRINTFN(n,x) if (uhiddebug>(n)) printf x 78 int uhiddebug = 0; 79 #else 80 #define DPRINTF(x) 81 #define DPRINTFN(n,x) 82 #endif 83 84 struct uhid_softc { 85 struct uhidev sc_hdev; 86 87 kmutex_t sc_access_lock; /* serialises syscall accesses */ 88 kmutex_t sc_lock; /* protects refcnt, others */ 89 kcondvar_t sc_cv; 90 kcondvar_t sc_detach_cv; 91 92 int sc_isize; 93 int sc_osize; 94 int sc_fsize; 95 96 u_char *sc_obuf; 97 98 struct clist sc_q; /* protected by sc_lock */ 99 struct selinfo sc_rsel; 100 proc_t *sc_async; /* process that wants SIGIO */ 101 void *sc_sih; 102 u_char sc_state; /* driver state */ 103 #define UHID_ASLP 0x01 /* waiting for device data */ 104 #define UHID_IMMED 0x02 /* return read data immediately */ 105 106 int sc_refcnt; 107 u_char sc_dying; 108 }; 109 110 #define UHIDUNIT(dev) (minor(dev)) 111 #define UHID_CHUNK 128 /* chunk size for read */ 112 #define UHID_BSIZE 1020 /* buffer size */ 113 114 static dev_type_open(uhidopen); 115 static dev_type_close(uhidclose); 116 static dev_type_read(uhidread); 117 static dev_type_write(uhidwrite); 118 static dev_type_ioctl(uhidioctl); 119 static dev_type_poll(uhidpoll); 120 static dev_type_kqfilter(uhidkqfilter); 121 122 const struct cdevsw uhid_cdevsw = { 123 .d_open = uhidopen, 124 .d_close = uhidclose, 125 .d_read = uhidread, 126 .d_write = uhidwrite, 127 .d_ioctl = uhidioctl, 128 .d_stop = nostop, 129 .d_tty = notty, 130 .d_poll = uhidpoll, 131 .d_mmap = nommap, 132 .d_kqfilter = uhidkqfilter, 133 .d_discard = nodiscard, 134 .d_flag = D_OTHER 135 }; 136 137 Static void uhid_intr(struct uhidev *, void *, u_int); 138 Static void uhid_softintr(void *); 139 140 Static int uhid_do_read(struct uhid_softc *, struct uio *, int); 141 Static int uhid_do_write(struct uhid_softc *, struct uio *, int); 142 Static int uhid_do_ioctl(struct uhid_softc*, u_long, void *, int, struct lwp *); 143 144 static int uhid_match(device_t, cfdata_t, void *); 145 static void uhid_attach(device_t, device_t, void *); 146 static int uhid_detach(device_t, int); 147 static int uhid_activate(device_t, enum devact); 148 149 CFATTACH_DECL_NEW(uhid, sizeof(struct uhid_softc), uhid_match, uhid_attach, 150 uhid_detach, uhid_activate); 151 152 static int 153 uhid_match(device_t parent, cfdata_t match, void *aux) 154 { 155 #ifdef UHID_DEBUG 156 struct uhidev_attach_arg *uha = aux; 157 #endif 158 159 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 160 161 if (match->cf_flags & 1) 162 return UMATCH_HIGHEST; 163 else 164 return UMATCH_IFACECLASS_GENERIC; 165 } 166 167 static void 168 uhid_attach(device_t parent, device_t self, void *aux) 169 { 170 struct uhid_softc *sc = device_private(self); 171 struct uhidev_attach_arg *uha = aux; 172 int size, repid; 173 void *desc; 174 175 sc->sc_hdev.sc_dev = self; 176 selinit(&sc->sc_rsel); 177 sc->sc_hdev.sc_intr = uhid_intr; 178 sc->sc_hdev.sc_parent = uha->parent; 179 sc->sc_hdev.sc_report_id = uha->reportid; 180 sc->sc_sih = softint_establish(SOFTINT_CLOCK, uhid_softintr, sc); 181 182 uhidev_get_report_desc(uha->parent, &desc, &size); 183 repid = uha->reportid; 184 sc->sc_isize = hid_report_size(desc, size, hid_input, repid); 185 sc->sc_osize = hid_report_size(desc, size, hid_output, repid); 186 sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid); 187 188 aprint_naive("\n"); 189 aprint_normal(": input=%d, output=%d, feature=%d\n", 190 sc->sc_isize, sc->sc_osize, sc->sc_fsize); 191 192 mutex_init(&sc->sc_access_lock, MUTEX_DEFAULT, IPL_NONE); 193 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_SOFTUSB); 194 cv_init(&sc->sc_cv, "uhidrea"); 195 cv_init(&sc->sc_detach_cv, "uhiddet"); 196 197 if (!pmf_device_register(self, NULL, NULL)) 198 aprint_error_dev(self, "couldn't establish power handler\n"); 199 200 return; 201 } 202 203 static int 204 uhid_activate(device_t self, enum devact act) 205 { 206 struct uhid_softc *sc = device_private(self); 207 208 switch (act) { 209 case DVACT_DEACTIVATE: 210 sc->sc_dying = 1; 211 return 0; 212 default: 213 return EOPNOTSUPP; 214 } 215 } 216 217 static int 218 uhid_detach(device_t self, int flags) 219 { 220 struct uhid_softc *sc = device_private(self); 221 int maj, mn; 222 223 DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); 224 225 sc->sc_dying = 1; 226 227 pmf_device_deregister(self); 228 229 mutex_enter(&sc->sc_lock); 230 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 231 if (--sc->sc_refcnt >= 0) { 232 /* Wake everyone */ 233 cv_broadcast(&sc->sc_cv); 234 /* Wait for processes to go away. */ 235 if (cv_timedwait(&sc->sc_detach_cv, &sc->sc_lock, hz * 60)) 236 aprint_error_dev(self, ": didn't detach\n"); 237 } 238 } 239 mutex_exit(&sc->sc_lock); 240 241 /* locate the major number */ 242 maj = cdevsw_lookup_major(&uhid_cdevsw); 243 244 /* Nuke the vnodes for any open instances (calls close). */ 245 mn = device_unit(self); 246 vdevgone(maj, mn, mn, VCHR); 247 248 #if 0 249 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, 250 sc->sc_hdev.sc_parent->sc_udev, sc->sc_hdev.sc_dev); 251 #endif 252 cv_destroy(&sc->sc_cv); 253 cv_destroy(&sc->sc_detach_cv); 254 mutex_destroy(&sc->sc_lock); 255 mutex_destroy(&sc->sc_access_lock); 256 seldestroy(&sc->sc_rsel); 257 softint_disestablish(sc->sc_sih); 258 259 return 0; 260 } 261 262 void 263 uhid_intr(struct uhidev *addr, void *data, u_int len) 264 { 265 struct uhid_softc *sc = (struct uhid_softc *)addr; 266 267 #ifdef UHID_DEBUG 268 if (uhiddebug > 5) { 269 uint32_t i; 270 271 DPRINTF(("uhid_intr: data =")); 272 for (i = 0; i < len; i++) 273 DPRINTF((" %02x", ((u_char *)data)[i])); 274 DPRINTF(("\n")); 275 } 276 #endif 277 278 mutex_enter(&sc->sc_lock); 279 (void)b_to_q(data, len, &sc->sc_q); 280 281 if (sc->sc_state & UHID_ASLP) { 282 sc->sc_state &= ~UHID_ASLP; 283 DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); 284 cv_broadcast(&sc->sc_cv); 285 } 286 selnotify(&sc->sc_rsel, 0, 0); 287 if (sc->sc_async != NULL) { 288 DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async)); 289 softint_schedule(sc->sc_sih); 290 } 291 mutex_exit(&sc->sc_lock); 292 } 293 294 void 295 uhid_softintr(void *cookie) 296 { 297 struct uhid_softc *sc; 298 299 sc = cookie; 300 301 mutex_enter(proc_lock); 302 if (sc->sc_async != NULL) 303 psignal(sc->sc_async, SIGIO); 304 mutex_exit(proc_lock); 305 } 306 307 static int 308 uhidopen(dev_t dev, int flag, int mode, struct lwp *l) 309 { 310 struct uhid_softc *sc; 311 int error; 312 313 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 314 if (sc == NULL) 315 return ENXIO; 316 317 DPRINTF(("uhidopen: sc=%p\n", sc)); 318 319 if (sc->sc_dying) 320 return ENXIO; 321 322 mutex_enter(&sc->sc_lock); 323 324 /* 325 * uhid interrupts aren't enabled yet, so setup sc_q now, as 326 * long as they're not already allocated. 327 */ 328 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 329 mutex_exit(&sc->sc_lock); 330 return EBUSY; 331 } 332 mutex_exit(&sc->sc_lock); 333 334 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 335 return ENOMEM; 336 } 337 338 mutex_enter(&sc->sc_access_lock); 339 error = uhidev_open(&sc->sc_hdev); 340 if (error) { 341 clfree(&sc->sc_q); 342 mutex_exit(&sc->sc_access_lock); 343 return error; 344 } 345 mutex_exit(&sc->sc_access_lock); 346 347 if (sc->sc_osize > 0) 348 sc->sc_obuf = kmem_alloc(sc->sc_osize, KM_SLEEP); 349 else 350 sc->sc_obuf = NULL; 351 sc->sc_state &= ~UHID_IMMED; 352 353 mutex_enter(proc_lock); 354 sc->sc_async = NULL; 355 mutex_exit(proc_lock); 356 357 return 0; 358 } 359 360 static int 361 uhidclose(dev_t dev, int flag, int mode, struct lwp *l) 362 { 363 struct uhid_softc *sc; 364 365 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 366 367 DPRINTF(("uhidclose: sc=%p\n", sc)); 368 369 mutex_enter(proc_lock); 370 sc->sc_async = NULL; 371 mutex_exit(proc_lock); 372 373 mutex_enter(&sc->sc_access_lock); 374 375 uhidev_stop(&sc->sc_hdev); 376 377 clfree(&sc->sc_q); 378 if (sc->sc_osize > 0) 379 kmem_free(sc->sc_obuf, sc->sc_osize); 380 381 uhidev_close(&sc->sc_hdev); 382 383 mutex_exit(&sc->sc_access_lock); 384 385 return 0; 386 } 387 388 Static int 389 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 390 { 391 int error = 0; 392 int extra; 393 size_t length; 394 u_char buffer[UHID_CHUNK]; 395 usbd_status err; 396 397 DPRINTFN(1, ("uhidread\n")); 398 if (sc->sc_state & UHID_IMMED) { 399 DPRINTFN(1, ("uhidread immed\n")); 400 extra = sc->sc_hdev.sc_report_id != 0; 401 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 402 buffer, sc->sc_isize + extra); 403 if (err) 404 return EIO; 405 return uiomove(buffer+extra, sc->sc_isize, uio); 406 } 407 408 mutex_enter(&sc->sc_lock); 409 while (sc->sc_q.c_cc == 0) { 410 if (flag & IO_NDELAY) { 411 mutex_exit(&sc->sc_lock); 412 return EWOULDBLOCK; 413 } 414 sc->sc_state |= UHID_ASLP; 415 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 416 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 417 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 418 if (sc->sc_dying) 419 error = EIO; 420 if (error) { 421 sc->sc_state &= ~UHID_ASLP; 422 break; 423 } 424 } 425 426 /* Transfer as many chunks as possible. */ 427 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 428 length = uimin(sc->sc_q.c_cc, uio->uio_resid); 429 if (length > sizeof(buffer)) 430 length = sizeof(buffer); 431 432 /* Remove a small chunk from the input queue. */ 433 (void) q_to_b(&sc->sc_q, buffer, length); 434 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 435 436 /* Copy the data to the user process. */ 437 mutex_exit(&sc->sc_lock); 438 if ((error = uiomove(buffer, length, uio)) != 0) 439 return error; 440 mutex_enter(&sc->sc_lock); 441 } 442 443 mutex_exit(&sc->sc_lock); 444 return error; 445 } 446 447 static int 448 uhidread(dev_t dev, struct uio *uio, int flag) 449 { 450 struct uhid_softc *sc; 451 int error; 452 453 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 454 455 mutex_enter(&sc->sc_lock); 456 sc->sc_refcnt++; 457 mutex_exit(&sc->sc_lock); 458 459 mutex_enter(&sc->sc_access_lock); 460 error = uhid_do_read(sc, uio, flag); 461 mutex_exit(&sc->sc_access_lock); 462 463 mutex_enter(&sc->sc_lock); 464 if (--sc->sc_refcnt < 0) 465 cv_broadcast(&sc->sc_detach_cv); 466 mutex_exit(&sc->sc_lock); 467 return error; 468 } 469 470 Static int 471 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 472 { 473 int error; 474 int size; 475 usbd_status err; 476 477 DPRINTFN(1, ("uhidwrite\n")); 478 479 if (sc->sc_dying) 480 return EIO; 481 482 size = sc->sc_osize; 483 error = 0; 484 if (uio->uio_resid != size || size == 0) 485 return EINVAL; 486 error = uiomove(sc->sc_obuf, size, uio); 487 if (!error) { 488 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 489 sc->sc_obuf, size); 490 if (err) 491 error = EIO; 492 } 493 494 return error; 495 } 496 497 int 498 uhidwrite(dev_t dev, struct uio *uio, int flag) 499 { 500 struct uhid_softc *sc; 501 int error; 502 503 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 504 505 mutex_enter(&sc->sc_lock); 506 sc->sc_refcnt++; 507 mutex_exit(&sc->sc_lock); 508 509 mutex_enter(&sc->sc_access_lock); 510 error = uhid_do_write(sc, uio, flag); 511 mutex_exit(&sc->sc_access_lock); 512 513 mutex_enter(&sc->sc_lock); 514 if (--sc->sc_refcnt < 0) 515 cv_broadcast(&sc->sc_detach_cv); 516 mutex_exit(&sc->sc_lock); 517 return error; 518 } 519 520 int 521 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr, 522 int flag, struct lwp *l) 523 { 524 struct usb_ctl_report_desc *rd; 525 struct usb_ctl_report *re; 526 u_char buffer[UHID_CHUNK]; 527 int size, extra; 528 usbd_status err; 529 void *desc; 530 531 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 532 533 if (sc->sc_dying) 534 return EIO; 535 536 switch (cmd) { 537 case FIONBIO: 538 /* All handled in the upper FS layer. */ 539 break; 540 541 case FIOASYNC: 542 mutex_enter(proc_lock); 543 if (*(int *)addr) { 544 if (sc->sc_async != NULL) 545 return EBUSY; 546 sc->sc_async = l->l_proc; 547 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 548 } else 549 sc->sc_async = NULL; 550 mutex_exit(proc_lock); 551 break; 552 553 /* XXX this is not the most general solution. */ 554 case TIOCSPGRP: 555 mutex_enter(proc_lock); 556 if (sc->sc_async == NULL) { 557 mutex_exit(proc_lock); 558 return EINVAL; 559 } 560 if (*(int *)addr != sc->sc_async->p_pgid) { 561 mutex_exit(proc_lock); 562 return EPERM; 563 } 564 mutex_exit(proc_lock); 565 break; 566 567 case FIOSETOWN: 568 mutex_enter(proc_lock); 569 if (sc->sc_async == NULL) { 570 mutex_exit(proc_lock); 571 return EINVAL; 572 } 573 if (-*(int *)addr != sc->sc_async->p_pgid 574 && *(int *)addr != sc->sc_async->p_pid) { 575 mutex_exit(proc_lock); 576 return EPERM; 577 } 578 mutex_exit(proc_lock); 579 break; 580 581 case USB_GET_REPORT_DESC: 582 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 583 rd = (struct usb_ctl_report_desc *)addr; 584 size = uimin(size, sizeof(rd->ucrd_data)); 585 rd->ucrd_size = size; 586 memcpy(rd->ucrd_data, desc, size); 587 break; 588 589 case USB_SET_IMMED: 590 if (*(int *)addr) { 591 extra = sc->sc_hdev.sc_report_id != 0; 592 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 593 buffer, sc->sc_isize + extra); 594 if (err) 595 return EOPNOTSUPP; 596 597 sc->sc_state |= UHID_IMMED; 598 } else 599 sc->sc_state &= ~UHID_IMMED; 600 break; 601 602 case USB_GET_REPORT: 603 re = (struct usb_ctl_report *)addr; 604 switch (re->ucr_report) { 605 case UHID_INPUT_REPORT: 606 size = sc->sc_isize; 607 break; 608 case UHID_OUTPUT_REPORT: 609 size = sc->sc_osize; 610 break; 611 case UHID_FEATURE_REPORT: 612 size = sc->sc_fsize; 613 break; 614 default: 615 return EINVAL; 616 } 617 extra = sc->sc_hdev.sc_report_id != 0; 618 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 619 re->ucr_data, size + extra); 620 if (extra) 621 memmove(re->ucr_data, re->ucr_data+1, size); 622 if (err) 623 return EIO; 624 break; 625 626 case USB_SET_REPORT: 627 re = (struct usb_ctl_report *)addr; 628 switch (re->ucr_report) { 629 case UHID_INPUT_REPORT: 630 size = sc->sc_isize; 631 break; 632 case UHID_OUTPUT_REPORT: 633 size = sc->sc_osize; 634 break; 635 case UHID_FEATURE_REPORT: 636 size = sc->sc_fsize; 637 break; 638 default: 639 return EINVAL; 640 } 641 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 642 re->ucr_data, size); 643 if (err) 644 return EIO; 645 break; 646 647 case USB_GET_REPORT_ID: 648 *(int *)addr = sc->sc_hdev.sc_report_id; 649 break; 650 651 case USB_GET_DEVICE_DESC: 652 *(usb_device_descriptor_t *)addr = 653 *usbd_get_device_descriptor(sc->sc_hdev.sc_parent->sc_udev); 654 break; 655 656 case USB_GET_DEVICEINFO: 657 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 658 (struct usb_device_info *)addr, 0); 659 break; 660 case USB_GET_DEVICEINFO_OLD: 661 MODULE_HOOK_CALL(usb_subr_fill_30_hook, 662 (sc->sc_hdev.sc_parent->sc_udev, 663 (struct usb_device_info_old *)addr, 0, 664 usbd_devinfo_vp, usbd_printBCD), 665 enosys(), err); 666 if (err == 0) 667 return 0; 668 break; 669 case USB_GET_STRING_DESC: 670 { 671 struct usb_string_desc *si = (struct usb_string_desc *)addr; 672 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 673 si->usd_string_index, 674 si->usd_language_id, &si->usd_desc, &size); 675 if (err) 676 return EINVAL; 677 break; 678 } 679 680 default: 681 return EINVAL; 682 } 683 return 0; 684 } 685 686 static int 687 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 688 { 689 struct uhid_softc *sc; 690 int error; 691 692 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 693 if (sc == NULL) 694 return ENXIO; 695 696 if (sc->sc_dying) 697 return EIO; 698 699 mutex_enter(&sc->sc_lock); 700 sc->sc_refcnt++; 701 mutex_exit(&sc->sc_lock); 702 703 mutex_enter(&sc->sc_access_lock); 704 error = uhid_do_ioctl(sc, cmd, addr, flag, l); 705 mutex_exit(&sc->sc_access_lock); 706 707 mutex_enter(&sc->sc_lock); 708 if (--sc->sc_refcnt < 0) 709 cv_broadcast(&sc->sc_detach_cv); 710 mutex_exit(&sc->sc_lock); 711 return error; 712 } 713 714 static int 715 uhidpoll(dev_t dev, int events, struct lwp *l) 716 { 717 struct uhid_softc *sc; 718 int revents = 0; 719 720 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 721 if (sc == NULL) 722 return ENXIO; 723 724 if (sc->sc_dying) 725 return EIO; 726 727 mutex_enter(&sc->sc_lock); 728 if (events & (POLLOUT | POLLWRNORM)) 729 revents |= events & (POLLOUT | POLLWRNORM); 730 if (events & (POLLIN | POLLRDNORM)) { 731 if (sc->sc_q.c_cc > 0) 732 revents |= events & (POLLIN | POLLRDNORM); 733 else 734 selrecord(l, &sc->sc_rsel); 735 } 736 mutex_exit(&sc->sc_lock); 737 738 return revents; 739 } 740 741 static void 742 filt_uhidrdetach(struct knote *kn) 743 { 744 struct uhid_softc *sc = kn->kn_hook; 745 746 mutex_enter(&sc->sc_lock); 747 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 748 mutex_exit(&sc->sc_lock); 749 } 750 751 static int 752 filt_uhidread(struct knote *kn, long hint) 753 { 754 struct uhid_softc *sc = kn->kn_hook; 755 756 kn->kn_data = sc->sc_q.c_cc; 757 return kn->kn_data > 0; 758 } 759 760 static const struct filterops uhidread_filtops = { 761 .f_isfd = 1, 762 .f_attach = NULL, 763 .f_detach = filt_uhidrdetach, 764 .f_event = filt_uhidread, 765 }; 766 767 static const struct filterops uhid_seltrue_filtops = { 768 .f_isfd = 1, 769 .f_attach = NULL, 770 .f_detach = filt_uhidrdetach, 771 .f_event = filt_seltrue, 772 }; 773 774 static int 775 uhidkqfilter(dev_t dev, struct knote *kn) 776 { 777 struct uhid_softc *sc; 778 struct klist *klist; 779 780 sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 781 782 if (sc->sc_dying) 783 return ENXIO; 784 785 switch (kn->kn_filter) { 786 case EVFILT_READ: 787 klist = &sc->sc_rsel.sel_klist; 788 kn->kn_fop = &uhidread_filtops; 789 break; 790 791 case EVFILT_WRITE: 792 klist = &sc->sc_rsel.sel_klist; 793 kn->kn_fop = &uhid_seltrue_filtops; 794 break; 795 796 default: 797 return EINVAL; 798 } 799 800 kn->kn_hook = sc; 801 802 mutex_enter(&sc->sc_lock); 803 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 804 mutex_exit(&sc->sc_lock); 805 806 return 0; 807 } 808
Indexes created Sat Sep 27 22:09:54 GMT 2025