Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/uhid.c
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1 /* $NetBSD: uhid.c,v 1.60.2.2 2004/07/02 17:17:06 he Exp $ */ 2 3 /* 4 * Copyright (c) 1998 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@augustsson.net) at 9 * Carlstedt Research & Technology. 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 /* 41 * HID spec: http://www.usb.org/developers/devclass_docs/HID1_11.pdf 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: uhid.c,v 1.60.2.2 2004/07/02 17:17:06 he Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/malloc.h> 51 #include <sys/signalvar.h> 52 #include <sys/device.h> 53 #include <sys/ioctl.h> 54 #include <sys/conf.h> 55 #include <sys/tty.h> 56 #include <sys/file.h> 57 #include <sys/select.h> 58 #include <sys/proc.h> 59 #include <sys/vnode.h> 60 #include <sys/poll.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/hid.h> 69 #include <dev/usb/usb_quirks.h> 70 71 #include <dev/usb/uhidev.h> 72 73 #ifdef UHID_DEBUG 74 #define DPRINTF(x) if (uhiddebug) logprintf x 75 #define DPRINTFN(n,x) if (uhiddebug>(n)) logprintf 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 int sc_isize; 86 int sc_osize; 87 int sc_fsize; 88 89 u_char *sc_obuf; 90 91 struct clist sc_q; 92 struct selinfo sc_rsel; 93 usb_proc_ptr sc_async; /* process that wants SIGIO */ 94 u_char sc_state; /* driver state */ 95 #define UHID_ASLP 0x01 /* waiting for device data */ 96 #define UHID_IMMED 0x02 /* return read data immediately */ 97 98 int sc_refcnt; 99 u_char sc_dying; 100 }; 101 102 #define UHIDUNIT(dev) (minor(dev)) 103 #define UHID_CHUNK 128 /* chunk size for read */ 104 #define UHID_BSIZE 1020 /* buffer size */ 105 106 dev_type_open(uhidopen); 107 dev_type_close(uhidclose); 108 dev_type_read(uhidread); 109 dev_type_write(uhidwrite); 110 dev_type_ioctl(uhidioctl); 111 dev_type_poll(uhidpoll); 112 dev_type_kqfilter(uhidkqfilter); 113 114 const struct cdevsw uhid_cdevsw = { 115 uhidopen, uhidclose, uhidread, uhidwrite, uhidioctl, 116 nostop, notty, uhidpoll, nommap, uhidkqfilter, 117 }; 118 119 Static void uhid_intr(struct uhidev *, void *, u_int len); 120 121 Static int uhid_do_read(struct uhid_softc *, struct uio *uio, int); 122 Static int uhid_do_write(struct uhid_softc *, struct uio *uio, int); 123 Static int uhid_do_ioctl(struct uhid_softc*, u_long, caddr_t, int, usb_proc_ptr); 124 125 USB_DECLARE_DRIVER(uhid); 126 127 int 128 uhid_match(struct device *parent, struct cfdata *match, void *aux) 129 { 130 struct uhidev_attach_arg *uha = aux; 131 132 DPRINTF(("uhid_match: report=%d\n", uha->reportid)); 133 134 if (uha->matchlvl) 135 return (uha->matchlvl); 136 return (UMATCH_IFACECLASS_GENERIC); 137 } 138 139 void 140 uhid_attach(struct device *parent, struct device *self, void *aux) 141 { 142 struct uhid_softc *sc = (struct uhid_softc *)self; 143 struct uhidev_attach_arg *uha = aux; 144 int size, repid; 145 void *desc; 146 147 sc->sc_hdev.sc_intr = uhid_intr; 148 sc->sc_hdev.sc_parent = uha->parent; 149 sc->sc_hdev.sc_report_id = uha->reportid; 150 151 uhidev_get_report_desc(uha->parent, &desc, &size); 152 repid = uha->reportid; 153 sc->sc_isize = hid_report_size(desc, size, hid_input, repid); 154 sc->sc_osize = hid_report_size(desc, size, hid_output, repid); 155 sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid); 156 157 printf(": input=%d, output=%d, feature=%d\n", 158 sc->sc_isize, sc->sc_osize, sc->sc_fsize); 159 160 USB_ATTACH_SUCCESS_RETURN; 161 } 162 163 int 164 uhid_activate(device_ptr_t self, enum devact act) 165 { 166 struct uhid_softc *sc = (struct uhid_softc *)self; 167 168 switch (act) { 169 case DVACT_ACTIVATE: 170 return (EOPNOTSUPP); 171 172 case DVACT_DEACTIVATE: 173 sc->sc_dying = 1; 174 break; 175 } 176 return (0); 177 } 178 179 int 180 uhid_detach(struct device *self, int flags) 181 { 182 struct uhid_softc *sc = (struct uhid_softc *)self; 183 int s; 184 int maj, mn; 185 186 DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags)); 187 188 sc->sc_dying = 1; 189 190 if (sc->sc_hdev.sc_state & UHIDEV_OPEN) { 191 s = splusb(); 192 if (--sc->sc_refcnt >= 0) { 193 /* Wake everyone */ 194 wakeup(&sc->sc_q); 195 /* Wait for processes to go away. */ 196 usb_detach_wait(USBDEV(sc->sc_hdev.sc_dev)); 197 } 198 splx(s); 199 } 200 201 /* locate the major number */ 202 #if defined(__NetBSD__) 203 maj = cdevsw_lookup_major(&uhid_cdevsw); 204 #elif defined(__OpenBSD__) 205 for (maj = 0; maj < nchrdev; maj++) 206 if (cdevsw[maj].d_open == uhidopen) 207 break; 208 #endif 209 210 /* Nuke the vnodes for any open instances (calls close). */ 211 mn = self->dv_unit; 212 vdevgone(maj, mn, mn, VCHR); 213 214 #if 0 215 usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, 216 sc->sc_hdev.sc_parent->sc_udev, 217 USBDEV(sc->sc_hdev.sc_dev)); 218 #endif 219 220 return (0); 221 } 222 223 void 224 uhid_intr(struct uhidev *addr, void *data, u_int len) 225 { 226 struct uhid_softc *sc = (struct uhid_softc *)addr; 227 228 #ifdef UHID_DEBUG 229 if (uhiddebug > 5) { 230 u_int32_t i; 231 232 DPRINTF(("uhid_intr: data =")); 233 for (i = 0; i < len; i++) 234 DPRINTF((" %02x", ((u_char *)data)[i])); 235 DPRINTF(("\n")); 236 } 237 #endif 238 239 (void)b_to_q(data, len, &sc->sc_q); 240 241 if (sc->sc_state & UHID_ASLP) { 242 sc->sc_state &= ~UHID_ASLP; 243 DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q)); 244 wakeup(&sc->sc_q); 245 } 246 selnotify(&sc->sc_rsel, 0); 247 if (sc->sc_async != NULL) { 248 DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async)); 249 psignal(sc->sc_async, SIGIO); 250 } 251 } 252 253 int 254 uhidopen(dev_t dev, int flag, int mode, usb_proc_ptr p) 255 { 256 struct uhid_softc *sc; 257 int error; 258 259 USB_GET_SC_OPEN(uhid, UHIDUNIT(dev), sc); 260 261 DPRINTF(("uhidopen: sc=%p\n", sc)); 262 263 if (sc->sc_dying) 264 return (ENXIO); 265 266 error = uhidev_open(&sc->sc_hdev); 267 if (error) 268 return (error); 269 270 if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) { 271 uhidev_close(&sc->sc_hdev); 272 return (ENOMEM); 273 } 274 sc->sc_obuf = malloc(sc->sc_osize, M_USBDEV, M_WAITOK); 275 sc->sc_state &= ~UHID_IMMED; 276 sc->sc_async = NULL; 277 278 return (0); 279 } 280 281 int 282 uhidclose(dev_t dev, int flag, int mode, usb_proc_ptr p) 283 { 284 struct uhid_softc *sc; 285 286 USB_GET_SC(uhid, UHIDUNIT(dev), sc); 287 288 DPRINTF(("uhidclose: sc=%p\n", sc)); 289 290 clfree(&sc->sc_q); 291 free(sc->sc_obuf, M_USBDEV); 292 sc->sc_async = NULL; 293 uhidev_close(&sc->sc_hdev); 294 295 return (0); 296 } 297 298 int 299 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag) 300 { 301 int s; 302 int error = 0; 303 int extra; 304 size_t length; 305 u_char buffer[UHID_CHUNK]; 306 usbd_status err; 307 308 DPRINTFN(1, ("uhidread\n")); 309 if (sc->sc_state & UHID_IMMED) { 310 DPRINTFN(1, ("uhidread immed\n")); 311 extra = sc->sc_hdev.sc_report_id != 0; 312 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 313 buffer, sc->sc_isize + extra); 314 if (err) 315 return (EIO); 316 return (uiomove(buffer+extra, sc->sc_isize, uio)); 317 } 318 319 s = splusb(); 320 while (sc->sc_q.c_cc == 0) { 321 if (flag & IO_NDELAY) { 322 splx(s); 323 return (EWOULDBLOCK); 324 } 325 sc->sc_state |= UHID_ASLP; 326 DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q)); 327 error = tsleep(&sc->sc_q, PZERO | PCATCH, "uhidrea", 0); 328 DPRINTFN(5, ("uhidread: woke, error=%d\n", error)); 329 if (sc->sc_dying) 330 error = EIO; 331 if (error) { 332 sc->sc_state &= ~UHID_ASLP; 333 break; 334 } 335 } 336 splx(s); 337 338 /* Transfer as many chunks as possible. */ 339 while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) { 340 length = min(sc->sc_q.c_cc, uio->uio_resid); 341 if (length > sizeof(buffer)) 342 length = sizeof(buffer); 343 344 /* Remove a small chunk from the input queue. */ 345 (void) q_to_b(&sc->sc_q, buffer, length); 346 DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length)); 347 348 /* Copy the data to the user process. */ 349 if ((error = uiomove(buffer, length, uio)) != 0) 350 break; 351 } 352 353 return (error); 354 } 355 356 int 357 uhidread(dev_t dev, struct uio *uio, int flag) 358 { 359 struct uhid_softc *sc; 360 int error; 361 362 USB_GET_SC(uhid, UHIDUNIT(dev), sc); 363 364 sc->sc_refcnt++; 365 error = uhid_do_read(sc, uio, flag); 366 if (--sc->sc_refcnt < 0) 367 usb_detach_wakeup(USBDEV(sc->sc_hdev.sc_dev)); 368 return (error); 369 } 370 371 int 372 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag) 373 { 374 int error; 375 int size; 376 usbd_status err; 377 378 DPRINTFN(1, ("uhidwrite\n")); 379 380 if (sc->sc_dying) 381 return (EIO); 382 383 size = sc->sc_osize; 384 error = 0; 385 if (uio->uio_resid != size) 386 return (EINVAL); 387 error = uiomove(sc->sc_obuf, size, uio); 388 if (!error) { 389 err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT, 390 sc->sc_obuf, size); 391 if (err) 392 error = EIO; 393 } 394 395 return (error); 396 } 397 398 int 399 uhidwrite(dev_t dev, struct uio *uio, int flag) 400 { 401 struct uhid_softc *sc; 402 int error; 403 404 USB_GET_SC(uhid, UHIDUNIT(dev), sc); 405 406 sc->sc_refcnt++; 407 error = uhid_do_write(sc, uio, flag); 408 if (--sc->sc_refcnt < 0) 409 usb_detach_wakeup(USBDEV(sc->sc_hdev.sc_dev)); 410 return (error); 411 } 412 413 int 414 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, caddr_t addr, 415 int flag, usb_proc_ptr p) 416 { 417 struct usb_ctl_report_desc *rd; 418 struct usb_ctl_report *re; 419 u_char buffer[UHID_CHUNK]; 420 int size, extra; 421 usbd_status err; 422 void *desc; 423 424 DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd)); 425 426 if (sc->sc_dying) 427 return (EIO); 428 429 switch (cmd) { 430 case FIONBIO: 431 /* All handled in the upper FS layer. */ 432 break; 433 434 case FIOASYNC: 435 if (*(int *)addr) { 436 if (sc->sc_async != NULL) 437 return (EBUSY); 438 sc->sc_async = p; 439 DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", p)); 440 } else 441 sc->sc_async = NULL; 442 break; 443 444 /* XXX this is not the most general solution. */ 445 case TIOCSPGRP: 446 if (sc->sc_async == NULL) 447 return (EINVAL); 448 if (*(int *)addr != sc->sc_async->p_pgid) 449 return (EPERM); 450 break; 451 452 case FIOSETOWN: 453 if (sc->sc_async == NULL) 454 return (EINVAL); 455 if (-*(int *)addr != sc->sc_async->p_pgid 456 && *(int *)addr != sc->sc_async->p_pid); 457 return (EPERM); 458 break; 459 460 case USB_GET_REPORT_DESC: 461 uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size); 462 rd = (struct usb_ctl_report_desc *)addr; 463 size = min(size, sizeof rd->ucrd_data); 464 rd->ucrd_size = size; 465 memcpy(rd->ucrd_data, desc, size); 466 break; 467 468 case USB_SET_IMMED: 469 if (*(int *)addr) { 470 extra = sc->sc_hdev.sc_report_id != 0; 471 err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT, 472 buffer, sc->sc_isize + extra); 473 if (err) 474 return (EOPNOTSUPP); 475 476 sc->sc_state |= UHID_IMMED; 477 } else 478 sc->sc_state &= ~UHID_IMMED; 479 break; 480 481 case USB_GET_REPORT: 482 re = (struct usb_ctl_report *)addr; 483 switch (re->ucr_report) { 484 case UHID_INPUT_REPORT: 485 size = sc->sc_isize; 486 break; 487 case UHID_OUTPUT_REPORT: 488 size = sc->sc_osize; 489 break; 490 case UHID_FEATURE_REPORT: 491 size = sc->sc_fsize; 492 break; 493 default: 494 return (EINVAL); 495 } 496 extra = sc->sc_hdev.sc_report_id != 0; 497 err = uhidev_get_report(&sc->sc_hdev, re->ucr_report, 498 re->ucr_data, size + extra); 499 if (extra) 500 memcpy(re->ucr_data, re->ucr_data+1, size); 501 if (err) 502 return (EIO); 503 break; 504 505 case USB_SET_REPORT: 506 re = (struct usb_ctl_report *)addr; 507 switch (re->ucr_report) { 508 case UHID_INPUT_REPORT: 509 size = sc->sc_isize; 510 break; 511 case UHID_OUTPUT_REPORT: 512 size = sc->sc_osize; 513 break; 514 case UHID_FEATURE_REPORT: 515 size = sc->sc_fsize; 516 break; 517 default: 518 return (EINVAL); 519 } 520 err = uhidev_set_report(&sc->sc_hdev, re->ucr_report, 521 re->ucr_data, size); 522 if (err) 523 return (EIO); 524 break; 525 526 case USB_GET_REPORT_ID: 527 *(int *)addr = sc->sc_hdev.sc_report_id; 528 break; 529 530 case USB_GET_DEVICEINFO: 531 usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev, 532 (struct usb_device_info *)addr, 1); 533 break; 534 535 case USB_GET_STRING_DESC: 536 { 537 struct usb_string_desc *si = (struct usb_string_desc *)addr; 538 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev, 539 si->usd_string_index, 540 si->usd_language_id, &si->usd_desc, &size); 541 if (err) 542 return (EINVAL); 543 break; 544 } 545 546 default: 547 return (EINVAL); 548 } 549 return (0); 550 } 551 552 int 553 uhidioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, usb_proc_ptr p) 554 { 555 struct uhid_softc *sc; 556 int error; 557 558 USB_GET_SC(uhid, UHIDUNIT(dev), sc); 559 560 sc->sc_refcnt++; 561 error = uhid_do_ioctl(sc, cmd, addr, flag, p); 562 if (--sc->sc_refcnt < 0) 563 usb_detach_wakeup(USBDEV(sc->sc_hdev.sc_dev)); 564 return (error); 565 } 566 567 int 568 uhidpoll(dev_t dev, int events, usb_proc_ptr p) 569 { 570 struct uhid_softc *sc; 571 int revents = 0; 572 int s; 573 574 USB_GET_SC(uhid, UHIDUNIT(dev), sc); 575 576 if (sc->sc_dying) 577 return (EIO); 578 579 s = splusb(); 580 if (events & (POLLOUT | POLLWRNORM)) 581 revents |= events & (POLLOUT | POLLWRNORM); 582 if (events & (POLLIN | POLLRDNORM)) { 583 if (sc->sc_q.c_cc > 0) 584 revents |= events & (POLLIN | POLLRDNORM); 585 else 586 selrecord(p, &sc->sc_rsel); 587 } 588 589 splx(s); 590 return (revents); 591 } 592 593 static void 594 filt_uhidrdetach(struct knote *kn) 595 { 596 struct uhid_softc *sc = kn->kn_hook; 597 int s; 598 599 s = splusb(); 600 SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext); 601 splx(s); 602 } 603 604 static int 605 filt_uhidread(struct knote *kn, long hint) 606 { 607 struct uhid_softc *sc = kn->kn_hook; 608 609 kn->kn_data = sc->sc_q.c_cc; 610 return (kn->kn_data > 0); 611 } 612 613 static const struct filterops uhidread_filtops = 614 { 1, NULL, filt_uhidrdetach, filt_uhidread }; 615 616 static const struct filterops uhid_seltrue_filtops = 617 { 1, NULL, filt_uhidrdetach, filt_seltrue }; 618 619 int 620 uhidkqfilter(dev_t dev, struct knote *kn) 621 { 622 struct uhid_softc *sc; 623 struct klist *klist; 624 int s; 625 626 USB_GET_SC(uhid, UHIDUNIT(dev), sc); 627 628 if (sc->sc_dying) 629 return (EIO); 630 631 switch (kn->kn_filter) { 632 case EVFILT_READ: 633 klist = &sc->sc_rsel.sel_klist; 634 kn->kn_fop = &uhidread_filtops; 635 break; 636 637 case EVFILT_WRITE: 638 klist = &sc->sc_rsel.sel_klist; 639 kn->kn_fop = &uhid_seltrue_filtops; 640 break; 641 642 default: 643 return (1); 644 } 645 646 kn->kn_hook = sc; 647 648 s = splusb(); 649 SLIST_INSERT_HEAD(klist, kn, kn_selnext); 650 splx(s); 651 652 return (0); 653 }
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