uhid.c revision 1.125
1 /* $NetBSD: uhid.c,v 1.125 2022/03/31 17:43:50 christos 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 1.125 2022/03/31 17:43:50 christos 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/types.h> 47 48 #include <sys/atomic.h> 49 #include <sys/compat_stub.h> 50 #include <sys/conf.h> 51 #include <sys/device.h> 52 #include <sys/file.h> 53 #include <sys/intr.h> 54 #include <sys/ioctl.h> 55 #include <sys/kernel.h> 56 #include <sys/kmem.h> 57 #include <sys/poll.h> 58 #include <sys/proc.h> 59 #include <sys/select.h> 60 #include <sys/signalvar.h> 61 #include <sys/systm.h> 62 #include <sys/tty.h> 63 #include <sys/vnode.h> 64 65 #include <dev/usb/usb.h> 66 #include <dev/usb/usbhid.h> 67 68 #include <dev/usb/usbdevs.h> 69 #include <dev/usb/usbdi.h> 70 #include <dev/usb/usbdi_util.h> 71 #include <dev/usb/usb_quirks.h> 72 #include <dev/hid/hid.h> 73 74 #include <dev/usb/uhidev.h> 75 76 #include "ioconf.h" 77 78 #ifdef UHID_DEBUG 79 #define DPRINTF(x) if (uhiddebug) printf x 80 #define DPRINTFN(n,x) if (uhiddebug>(n)) printf x 81 int uhiddebug = 0; 82 #else 83 #define DPRINTF(x) 84 #define DPRINTFN(n,x) 85 #endif 86 87 struct uhid_softc { 88 device_t sc_dev; 89 struct uhidev *sc_hdev; 90 struct usbd_device *sc_udev; 91 uint8_t sc_report_id; 92 93 kmutex_t sc_lock; 94 kcondvar_t sc_cv; 95 96 int sc_isize; 97 int sc_osize; 98 int sc_fsize; 99 100 u_char *sc_obuf; 101 102 struct clist sc_q; /* protected by sc_lock */ 103 struct selinfo sc_rsel; 104 proc_t *sc_async; /* process that wants SIGIO */ 105 void *sc_sih; 106 volatile uint32_t sc_state; /* driver state */ 107 #define UHID_IMMED 0x02 /* return read data immediately */ 108 109 int sc_raw; 110 enum { 111 UHID_CLOSED, 112 UHID_OPENING, 113 UHID_OPEN, 114 } sc_open; 115 bool sc_closing; 116 }; 117 118 #define UHIDUNIT(dev) (minor(dev)) 119 #define UHID_CHUNK 128 /* chunk size for read */ 120 #define UHID_BSIZE 1020 /* buffer size */ 121 122 static dev_type_open(uhidopen); 123 static dev_type_cancel(uhidcancel); 124 static dev_type_close(uhidclose); 125 static dev_type_read(uhidread); 126 static dev_type_write(uhidwrite); 127 static dev_type_ioctl(uhidioctl); 128 static dev_type_poll(uhidpoll); 129 static dev_type_kqfilter(uhidkqfilter); 130 131 const struct cdevsw uhid_cdevsw = { 132 .d_open = uhidopen, 133 .d_cancel = uhidcancel, 134 .d_close = uhidclose, 135 .d_read = uhidread, 136 .d_write = uhidwrite, 137 .d_ioctl = uhidioctl, 138 .d_stop = nostop, 139 .d_tty = notty, 140 .d_poll = uhidpoll, 141 .d_mmap = nommap, 142 .d_kqfilter = uhidkqfilter, 143 .d_discard = nodiscard, 144 .d_cfdriver = &uhid_cd, 145 .d_devtounit = dev_minor_unit, 146 .d_flag = D_OTHER 147 }; 148 149 static void uhid_intr(void *, void *, u_int); 150 151 static int uhid_match(device_t, cfdata_t, void *); 152 static void uhid_attach(device_t, device_t, void *); 153 static int uhid_detach(device_t, int); 154 155 CFATTACH_DECL_NEW(uhid, sizeof(struct uhid_softc), uhid_match, uhid_attach, 156 uhid_detach, NULL); 157 158 static int 159 uhid_match(device_t parent, cfdata_t match, void *aux) 160 { 161 #ifdef UHID_DEBUG 162 struct uhidev_attach_arg *uha = aux; 163 #endif 164 165 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 166 167 if (match->cf_flags & 1) 168 return UMATCH_HIGHEST; 169 else 170 return UMATCH_IFACECLASS_GENERIC; 171 } 172 173 static void 174 uhid_attach(device_t parent, device_t self, void *aux) 175 { 176 struct uhid_softc *sc = device_private(self); 177 struct uhidev_attach_arg *uha = aux; 178 int size, repid; 179 void *desc; 180 181 sc->sc_dev = self; 182 sc->sc_hdev = uha->parent; 183 sc->sc_udev = uha->uiaa->uiaa_device; 184 sc->sc_report_id = uha->reportid; 185 186 selinit(&sc->sc_rsel); 187 188 uhidev_get_report_desc(uha->parent, &desc, &size); 189 repid = uha->reportid; 190 sc->sc_isize = hid_report_size(desc, size, hid_input, repid); 191 sc->sc_osize = hid_report_size(desc, size, hid_output, repid); 192 sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid); 193 sc->sc_raw = hid_is_collection(desc, size, uha->reportid, 194 HID_USAGE2(HUP_FIDO, HUF_U2FHID)); 195 196 aprint_naive("\n"); 197 aprint_normal(": input=%d, output=%d, feature=%d\n", 198 sc->sc_isize, sc->sc_osize, sc->sc_fsize); 199 200 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_SOFTUSB); 201 cv_init(&sc->sc_cv, "uhidrea"); 202 203 if (!pmf_device_register(self, NULL, NULL)) 204 aprint_error_dev(self, "couldn't establish power handler\n"); 205 206 return; 207 } 208 209 static int 210 uhid_detach(device_t self, int flags) 211 { 212 struct uhid_softc *sc = device_private(self); 213 int maj, mn; 214 215 DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); 216 217 pmf_device_deregister(self); 218 219 /* locate the major number */ 220 maj = cdevsw_lookup_major(&uhid_cdevsw); 221 222 /* Nuke the vnodes for any open instances (calls close). */ 223 mn = device_unit(self); 224 vdevgone(maj, mn, mn, VCHR); 225 226 KASSERTMSG(sc->sc_open == UHID_CLOSED, "open=%d", (int)sc->sc_open); 227 228 cv_destroy(&sc->sc_cv); 229 mutex_destroy(&sc->sc_lock); 230 seldestroy(&sc->sc_rsel); 231 232 return 0; 233 } 234 235 static void 236 uhid_intr(void *cookie, void *data, u_int len) 237 { 238 struct uhid_softc *sc = cookie; 239 240 #ifdef UHID_DEBUG 241 if (uhiddebug > 5) { 242 uint32_t i; 243 244 DPRINTF(("uhid_intr: data =")); 245 for (i = 0; i < len; i++) 246 DPRINTF((" %02x", ((u_char *)data)[i])); 247 DPRINTF(("\n")); 248 } 249 #endif 250 251 mutex_enter(&sc->sc_lock); 252 (void)b_to_q(data, len, &sc->sc_q); 253 254 DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); 255 cv_broadcast(&sc->sc_cv); 256 selnotify(&sc->sc_rsel, 0, NOTE_SUBMIT); 257 if (atomic_load_relaxed(&sc->sc_async) != NULL) { 258 mutex_enter(&proc_lock); 259 if (sc->sc_async != NULL) { 260 DPRINTFN(3, ("uhid_intr: sending SIGIO to %jd\n", 261 (intmax_t)sc->sc_async->p_pid)); 262 psignal(sc->sc_async, SIGIO); 263 } 264 mutex_exit(&proc_lock); 265 } 266 mutex_exit(&sc->sc_lock); 267 } 268 269 static int 270 uhidopen(dev_t dev, int flag, int mode, struct lwp *l) 271 { 272 struct uhid_softc *sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 273 int error; 274 275 DPRINTF(("uhidopen: sc=%p\n", sc)); 276 if (sc == NULL) 277 return ENXIO; 278 279 /* 280 * Try to open. If closing in progress, give up. If already 281 * open (or opening), fail -- opens are exclusive. 282 */ 283 mutex_enter(&sc->sc_lock); 284 if (sc->sc_open != UHID_CLOSED || sc->sc_closing) { 285 mutex_exit(&sc->sc_lock); 286 return EBUSY; 287 } 288 sc->sc_open = UHID_OPENING; 289 atomic_store_relaxed(&sc->sc_state, 0); 290 mutex_exit(&sc->sc_lock); 291 292 /* uhid interrupts aren't enabled yet, so setup sc_q now */ 293 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 294 error = ENOMEM; 295 goto fail0; 296 } 297 298 /* Allocate an output buffer if needed. */ 299 if (sc->sc_osize > 0) 300 sc->sc_obuf = kmem_alloc(sc->sc_osize, KM_SLEEP); 301 else 302 sc->sc_obuf = NULL; 303 304 /* Paranoia: reset SIGIO before enabling interrputs. */ 305 mutex_enter(&proc_lock); 306 atomic_store_relaxed(&sc->sc_async, NULL); 307 mutex_exit(&proc_lock); 308 309 /* Open the uhidev -- after this point we can get interrupts. */ 310 error = uhidev_open(sc->sc_hdev, &uhid_intr, sc); 311 if (error) 312 goto fail1; 313 314 /* We are open for business. */ 315 mutex_enter(&sc->sc_lock); 316 sc->sc_open = UHID_OPEN; 317 cv_broadcast(&sc->sc_cv); 318 mutex_exit(&sc->sc_lock); 319 320 return 0; 321 322 fail1: selnotify(&sc->sc_rsel, POLLHUP, 0); 323 mutex_enter(&proc_lock); 324 atomic_store_relaxed(&sc->sc_async, NULL); 325 mutex_exit(&proc_lock); 326 if (sc->sc_osize > 0) { 327 kmem_free(sc->sc_obuf, sc->sc_osize); 328 sc->sc_obuf = NULL; 329 } 330 clfree(&sc->sc_q); 331 fail0: mutex_enter(&sc->sc_lock); 332 KASSERT(sc->sc_open == UHID_OPENING); 333 sc->sc_open = UHID_CLOSED; 334 cv_broadcast(&sc->sc_cv); 335 atomic_store_relaxed(&sc->sc_state, 0); 336 mutex_exit(&sc->sc_lock); 337 return error; 338 } 339 340 static int 341 uhidcancel(dev_t dev, int flag, int mode, struct lwp *l) 342 { 343 struct uhid_softc *sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 344 345 DPRINTF(("uhidcancel: sc=%p\n", sc)); 346 if (sc == NULL) 347 return 0; 348 349 /* 350 * Mark it closing, wake any waiters, and suspend output. 351 * After this point, no new xfers can be submitted. 352 */ 353 mutex_enter(&sc->sc_lock); 354 sc->sc_closing = true; 355 cv_broadcast(&sc->sc_cv); 356 mutex_exit(&sc->sc_lock); 357 358 uhidev_stop(sc->sc_hdev); 359 360 return 0; 361 } 362 363 static int 364 uhidclose(dev_t dev, int flag, int mode, struct lwp *l) 365 { 366 struct uhid_softc *sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 367 368 DPRINTF(("uhidclose: sc=%p\n", sc)); 369 if (sc == NULL) 370 return 0; 371 372 mutex_enter(&sc->sc_lock); 373 KASSERT(sc->sc_closing); 374 KASSERTMSG(sc->sc_open == UHID_OPEN || sc->sc_open == UHID_CLOSED, 375 "sc_open=%d", sc->sc_open); 376 if (sc->sc_open == UHID_CLOSED) 377 goto out; 378 379 /* Release the lock while we free things. */ 380 mutex_exit(&sc->sc_lock); 381 382 /* Prevent further interrupts. */ 383 uhidev_close(sc->sc_hdev); 384 385 /* Hang up all select/poll. */ 386 selnotify(&sc->sc_rsel, POLLHUP, 0); 387 388 /* Reset SIGIO. */ 389 mutex_enter(&proc_lock); 390 atomic_store_relaxed(&sc->sc_async, NULL); 391 mutex_exit(&proc_lock); 392 393 /* Free the buffer and queue. */ 394 if (sc->sc_osize > 0) { 395 kmem_free(sc->sc_obuf, sc->sc_osize); 396 sc->sc_obuf = NULL; 397 } 398 clfree(&sc->sc_q); 399 400 mutex_enter(&sc->sc_lock); 401 402 /* All set. We are now closed. */ 403 sc->sc_open = UHID_CLOSED; 404 out: KASSERT(sc->sc_open == UHID_CLOSED); 405 sc->sc_closing = false; 406 cv_broadcast(&sc->sc_cv); 407 atomic_store_relaxed(&sc->sc_state, 0); 408 mutex_exit(&sc->sc_lock); 409 410 return 0; 411 } 412 413 static int 414 uhidread(dev_t dev, struct uio *uio, int flag) 415 { 416 struct uhid_softc *sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 417 int error = 0; 418 int extra; 419 size_t length; 420 u_char buffer[UHID_CHUNK]; 421 usbd_status err; 422 423 DPRINTFN(1, ("uhidread\n")); 424 if (atomic_load_relaxed(&sc->sc_state) & UHID_IMMED) { 425 DPRINTFN(1, ("uhidread immed\n")); 426 extra = sc->sc_report_id != 0; 427 if (sc->sc_isize + extra > sizeof(buffer)) 428 return ENOBUFS; 429 err = uhidev_get_report(sc->sc_hdev, UHID_INPUT_REPORT, 430 buffer, sc->sc_isize + extra); 431 if (err) 432 return EIO; 433 return uiomove(buffer+extra, sc->sc_isize, uio); 434 } 435 436 mutex_enter(&sc->sc_lock); 437 while (sc->sc_q.c_cc == 0) { 438 if (flag & IO_NDELAY) { 439 mutex_exit(&sc->sc_lock); 440 return EWOULDBLOCK; 441 } 442 if (sc->sc_closing) { 443 mutex_exit(&sc->sc_lock); 444 return EIO; 445 } 446 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 447 error = cv_wait_sig(&sc->sc_cv, &sc->sc_lock); 448 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 449 if (error) { 450 break; 451 } 452 } 453 454 /* Transfer as many chunks as possible. */ 455 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 456 length = uimin(sc->sc_q.c_cc, uio->uio_resid); 457 if (length > sizeof(buffer)) 458 length = sizeof(buffer); 459 460 /* Remove a small chunk from the input queue. */ 461 (void) q_to_b(&sc->sc_q, buffer, length); 462 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 463 464 /* Copy the data to the user process. */ 465 mutex_exit(&sc->sc_lock); 466 if ((error = uiomove(buffer, length, uio)) != 0) 467 return error; 468 mutex_enter(&sc->sc_lock); 469 } 470 471 mutex_exit(&sc->sc_lock); 472 return error; 473 } 474 475 static int 476 uhidwrite(dev_t dev, struct uio *uio, int flag) 477 { 478 struct uhid_softc *sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 479 int error; 480 int size; 481 usbd_status err; 482 483 DPRINTFN(1, ("uhidwrite\n")); 484 485 size = sc->sc_osize; 486 if (uio->uio_resid != size || size == 0) 487 return EINVAL; 488 error = uiomove(sc->sc_obuf, size, uio); 489 #ifdef UHID_DEBUG 490 if (uhiddebug > 5) { 491 uint32_t i; 492 493 DPRINTF(("%s: outdata[%d] =", device_xname(sc->sc_dev), 494 error)); 495 for (i = 0; i < size; i++) 496 DPRINTF((" %02x", sc->sc_obuf[i])); 497 DPRINTF(("\n")); 498 } 499 #endif 500 if (!error) { 501 if (sc->sc_raw) 502 err = uhidev_write(sc->sc_hdev, sc->sc_obuf, size); 503 else 504 err = uhidev_set_report(sc->sc_hdev, 505 UHID_OUTPUT_REPORT, sc->sc_obuf, size); 506 if (err) { 507 DPRINTF(("%s: err = %d\n", 508 device_xname(sc->sc_dev), err)); 509 error = EIO; 510 } 511 } 512 513 return error; 514 } 515 516 static int 517 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l) 518 { 519 struct uhid_softc *sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 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 switch (cmd) { 530 case FIONBIO: 531 /* All handled in the upper FS layer. */ 532 break; 533 534 case FIOASYNC: 535 mutex_enter(&proc_lock); 536 if (*(int *)addr) { 537 if (sc->sc_async != NULL) { 538 mutex_exit(&proc_lock); 539 return EBUSY; 540 } 541 atomic_store_relaxed(&sc->sc_async, l->l_proc); 542 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc)); 543 } else 544 atomic_store_relaxed(&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_HID_GET_RAW: 577 *(int *)addr = sc->sc_raw; 578 break; 579 580 case USB_HID_SET_RAW: 581 sc->sc_raw = *(int *)addr; 582 break; 583 584 case USB_GET_REPORT_DESC: 585 uhidev_get_report_desc(sc->sc_hdev, &desc, &size); 586 rd = (struct usb_ctl_report_desc *)addr; 587 size = uimin(size, sizeof(rd->ucrd_data)); 588 rd->ucrd_size = size; 589 memcpy(rd->ucrd_data, desc, size); 590 break; 591 592 case USB_SET_IMMED: 593 if (*(int *)addr) { 594 extra = sc->sc_report_id != 0; 595 if (sc->sc_isize + extra > sizeof(buffer)) 596 return ENOBUFS; 597 err = uhidev_get_report(sc->sc_hdev, UHID_INPUT_REPORT, 598 buffer, sc->sc_isize + extra); 599 if (err) 600 return EOPNOTSUPP; 601 602 atomic_or_32(&sc->sc_state, UHID_IMMED); 603 } else 604 atomic_and_32(&sc->sc_state, ~UHID_IMMED); 605 break; 606 607 case USB_GET_REPORT: 608 re = (struct usb_ctl_report *)addr; 609 switch (re->ucr_report) { 610 case UHID_INPUT_REPORT: 611 size = sc->sc_isize; 612 break; 613 case UHID_OUTPUT_REPORT: 614 size = sc->sc_osize; 615 break; 616 case UHID_FEATURE_REPORT: 617 size = sc->sc_fsize; 618 break; 619 default: 620 return EINVAL; 621 } 622 extra = sc->sc_report_id != 0; 623 if (size + extra > sizeof(re->ucr_data)) 624 return ENOBUFS; 625 err = uhidev_get_report(sc->sc_hdev, re->ucr_report, 626 re->ucr_data, size + extra); 627 if (extra) 628 memmove(re->ucr_data, re->ucr_data+1, size); 629 if (err) 630 return EIO; 631 break; 632 633 case USB_SET_REPORT: 634 re = (struct usb_ctl_report *)addr; 635 switch (re->ucr_report) { 636 case UHID_INPUT_REPORT: 637 size = sc->sc_isize; 638 break; 639 case UHID_OUTPUT_REPORT: 640 size = sc->sc_osize; 641 break; 642 case UHID_FEATURE_REPORT: 643 size = sc->sc_fsize; 644 break; 645 default: 646 return EINVAL; 647 } 648 if (size > sizeof(re->ucr_data)) 649 return ENOBUFS; 650 err = uhidev_set_report(sc->sc_hdev, re->ucr_report, 651 re->ucr_data, size); 652 if (err) 653 return EIO; 654 break; 655 656 case USB_GET_REPORT_ID: 657 *(int *)addr = sc->sc_report_id; 658 break; 659 660 case USB_GET_DEVICE_DESC: 661 *(usb_device_descriptor_t *)addr = 662 *usbd_get_device_descriptor(sc->sc_udev); 663 break; 664 665 case USB_GET_DEVICEINFO: 666 usbd_fill_deviceinfo(sc->sc_udev, 667 (struct usb_device_info *)addr, 0); 668 break; 669 case USB_GET_DEVICEINFO_OLD: 670 MODULE_HOOK_CALL(usb_subr_fill_30_hook, 671 (sc->sc_udev, 672 (struct usb_device_info_old *)addr, 0, 673 usbd_devinfo_vp, usbd_printBCD), 674 enosys(), err); 675 if (err == 0) 676 return 0; 677 break; 678 case USB_GET_STRING_DESC: 679 { 680 struct usb_string_desc *si = (struct usb_string_desc *)addr; 681 err = usbd_get_string_desc(sc->sc_udev, 682 si->usd_string_index, 683 si->usd_language_id, &si->usd_desc, &size); 684 if (err) 685 return EINVAL; 686 break; 687 } 688 689 default: 690 return EINVAL; 691 } 692 return 0; 693 } 694 695 static int 696 uhidpoll(dev_t dev, int events, struct lwp *l) 697 { 698 struct uhid_softc *sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 699 int revents = 0; 700 701 mutex_enter(&sc->sc_lock); 702 if (events & (POLLOUT | POLLWRNORM)) 703 revents |= events & (POLLOUT | POLLWRNORM); 704 if (events & (POLLIN | POLLRDNORM)) { 705 if (sc->sc_q.c_cc > 0) 706 revents |= events & (POLLIN | POLLRDNORM); 707 else 708 selrecord(l, &sc->sc_rsel); 709 } 710 mutex_exit(&sc->sc_lock); 711 712 return revents; 713 } 714 715 static void 716 filt_uhidrdetach(struct knote *kn) 717 { 718 struct uhid_softc *sc = kn->kn_hook; 719 720 mutex_enter(&sc->sc_lock); 721 selremove_knote(&sc->sc_rsel, kn); 722 mutex_exit(&sc->sc_lock); 723 } 724 725 static int 726 filt_uhidread(struct knote *kn, long hint) 727 { 728 struct uhid_softc *sc = kn->kn_hook; 729 730 if (hint == NOTE_SUBMIT) 731 KASSERT(mutex_owned(&sc->sc_lock)); 732 else 733 mutex_enter(&sc->sc_lock); 734 735 kn->kn_data = sc->sc_q.c_cc; 736 737 if (hint == NOTE_SUBMIT) 738 KASSERT(mutex_owned(&sc->sc_lock)); 739 else 740 mutex_exit(&sc->sc_lock); 741 742 return kn->kn_data > 0; 743 } 744 745 static const struct filterops uhidread_filtops = { 746 .f_flags = FILTEROP_ISFD, 747 .f_attach = NULL, 748 .f_detach = filt_uhidrdetach, 749 .f_event = filt_uhidread, 750 }; 751 752 static int 753 uhidkqfilter(dev_t dev, struct knote *kn) 754 { 755 struct uhid_softc *sc = device_lookup_private(&uhid_cd, UHIDUNIT(dev)); 756 757 switch (kn->kn_filter) { 758 case EVFILT_READ: 759 kn->kn_fop = &uhidread_filtops; 760 kn->kn_hook = sc; 761 mutex_enter(&sc->sc_lock); 762 selrecord_knote(&sc->sc_rsel, kn); 763 mutex_exit(&sc->sc_lock); 764 return 0; 765 766 case EVFILT_WRITE: 767 kn->kn_fop = &seltrue_filtops; 768 return 0; 769 770 default: 771 return EINVAL; 772 } 773 } 774
Indexes created Tue Sep 23 23:09:58 GMT 2025