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uhid.c revision 1.80
      1 /*	$NetBSD: uhid.c,v 1.80 2008/04/24 15:35:28 ad Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1998, 2004, 2008 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.
     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 1.80 2008/04/24 15:35:28 ad Exp $");
     46 
     47 #include "opt_compat_netbsd.h"
     48 
     49 #include <sys/param.h>
     50 #include <sys/systm.h>
     51 #include <sys/kernel.h>
     52 #include <sys/malloc.h>
     53 #include <sys/signalvar.h>
     54 #include <sys/device.h>
     55 #include <sys/ioctl.h>
     56 #include <sys/conf.h>
     57 #include <sys/tty.h>
     58 #include <sys/file.h>
     59 #include <sys/select.h>
     60 #include <sys/proc.h>
     61 #include <sys/vnode.h>
     62 #include <sys/poll.h>
     63 #include <sys/intr.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/hid.h>
     72 #include <dev/usb/usb_quirks.h>
     73 
     74 #include <dev/usb/uhidev.h>
     75 
     76 #ifdef UHID_DEBUG
     77 #define DPRINTF(x)	if (uhiddebug) logprintf x
     78 #define DPRINTFN(n,x)	if (uhiddebug>(n)) logprintf x
     79 int	uhiddebug = 0;
     80 #else
     81 #define DPRINTF(x)
     82 #define DPRINTFN(n,x)
     83 #endif
     84 
     85 struct uhid_softc {
     86 	struct uhidev sc_hdev;
     87 
     88 	int sc_isize;
     89 	int sc_osize;
     90 	int sc_fsize;
     91 
     92 	u_char *sc_obuf;
     93 
     94 	struct clist sc_q;
     95 	struct selinfo sc_rsel;
     96 	usb_proc_ptr sc_async;	/* process that wants SIGIO */
     97 	void *sc_sih;
     98 	u_char sc_state;	/* driver state */
     99 #define	UHID_ASLP	0x01	/* waiting for device data */
    100 #define UHID_IMMED	0x02	/* return read data immediately */
    101 
    102 	int sc_refcnt;
    103 	u_char sc_dying;
    104 };
    105 
    106 #define	UHIDUNIT(dev)	(minor(dev))
    107 #define	UHID_CHUNK	128	/* chunk size for read */
    108 #define	UHID_BSIZE	1020	/* buffer size */
    109 
    110 dev_type_open(uhidopen);
    111 dev_type_close(uhidclose);
    112 dev_type_read(uhidread);
    113 dev_type_write(uhidwrite);
    114 dev_type_ioctl(uhidioctl);
    115 dev_type_poll(uhidpoll);
    116 dev_type_kqfilter(uhidkqfilter);
    117 
    118 const struct cdevsw uhid_cdevsw = {
    119 	uhidopen, uhidclose, uhidread, uhidwrite, uhidioctl,
    120 	nostop, notty, uhidpoll, nommap, uhidkqfilter, D_OTHER,
    121 };
    122 
    123 Static void uhid_intr(struct uhidev *, void *, u_int len);
    124 Static void uhid_softintr(void *);
    125 
    126 Static int uhid_do_read(struct uhid_softc *, struct uio *uio, int);
    127 Static int uhid_do_write(struct uhid_softc *, struct uio *uio, int);
    128 Static int uhid_do_ioctl(struct uhid_softc*, u_long, void *, int, struct lwp *);
    129 
    130 USB_DECLARE_DRIVER(uhid);
    131 
    132 int
    133 uhid_match(struct device *parent, struct cfdata *match,
    134     void *aux)
    135 {
    136 #ifdef UHID_DEBUG
    137 	struct uhidev_attach_arg *uha = aux;
    138 #endif
    139 
    140 	DPRINTF(("uhid_match: report=%d\n", uha->reportid));
    141 
    142 	if (match->cf_flags & 1)
    143 		return (UMATCH_HIGHEST);
    144 	else
    145 		return (UMATCH_IFACECLASS_GENERIC);
    146 }
    147 
    148 void
    149 uhid_attach(struct device *parent, struct device *self, void *aux)
    150 {
    151 	struct uhid_softc *sc = (struct uhid_softc *)self;
    152 	struct uhidev_attach_arg *uha = aux;
    153 	int size, repid;
    154 	void *desc;
    155 
    156 	selinit(&sc->sc_rsel);
    157 	sc->sc_hdev.sc_intr = uhid_intr;
    158 	sc->sc_hdev.sc_parent = uha->parent;
    159 	sc->sc_hdev.sc_report_id = uha->reportid;
    160 	sc->sc_sih = softint_establish(SOFTINT_MPSAFE | SOFTINT_CLOCK,
    161 	    uhid_softintr, sc);
    162 
    163 	uhidev_get_report_desc(uha->parent, &desc, &size);
    164 	repid = uha->reportid;
    165 	sc->sc_isize = hid_report_size(desc, size, hid_input,   repid);
    166 	sc->sc_osize = hid_report_size(desc, size, hid_output,  repid);
    167 	sc->sc_fsize = hid_report_size(desc, size, hid_feature, repid);
    168 
    169 	printf(": input=%d, output=%d, feature=%d\n",
    170 	       sc->sc_isize, sc->sc_osize, sc->sc_fsize);
    171 
    172 	if (!pmf_device_register(self, NULL, NULL))
    173 		aprint_error_dev(self, "couldn't establish power handler\n");
    174 
    175 	USB_ATTACH_SUCCESS_RETURN;
    176 }
    177 
    178 int
    179 uhid_activate(device_ptr_t self, enum devact act)
    180 {
    181 	struct uhid_softc *sc = (struct uhid_softc *)self;
    182 
    183 	switch (act) {
    184 	case DVACT_ACTIVATE:
    185 		return (EOPNOTSUPP);
    186 
    187 	case DVACT_DEACTIVATE:
    188 		sc->sc_dying = 1;
    189 		break;
    190 	}
    191 	return (0);
    192 }
    193 
    194 int
    195 uhid_detach(struct device *self, int flags)
    196 {
    197 	struct uhid_softc *sc = (struct uhid_softc *)self;
    198 	int s;
    199 	int maj, mn;
    200 
    201 	DPRINTF(("uhid_detach: sc=%p flags=%d\n", sc, flags));
    202 
    203 	sc->sc_dying = 1;
    204 
    205 	if (sc->sc_hdev.sc_state & UHIDEV_OPEN) {
    206 		s = splusb();
    207 		if (--sc->sc_refcnt >= 0) {
    208 			/* Wake everyone */
    209 			wakeup(&sc->sc_q);
    210 			/* Wait for processes to go away. */
    211 			usb_detach_wait(USBDEV(sc->sc_hdev.sc_dev));
    212 		}
    213 		splx(s);
    214 	}
    215 
    216 	/* locate the major number */
    217 #if defined(__NetBSD__)
    218 	maj = cdevsw_lookup_major(&uhid_cdevsw);
    219 #elif defined(__OpenBSD__)
    220 	for (maj = 0; maj < nchrdev; maj++)
    221 		if (cdevsw[maj].d_open == uhidopen)
    222 			break;
    223 #endif
    224 
    225 	/* Nuke the vnodes for any open instances (calls close). */
    226 	mn = device_unit(self);
    227 	vdevgone(maj, mn, mn, VCHR);
    228 
    229 #if 0
    230 	usbd_add_drv_event(USB_EVENT_DRIVER_DETACH,
    231 			   sc->sc_hdev.sc_parent->sc_udev,
    232 			   USBDEV(sc->sc_hdev.sc_dev));
    233 #endif
    234 	seldestroy(&sc->sc_rsel);
    235 	softint_disestablish(sc->sc_sih);
    236 
    237 	return (0);
    238 }
    239 
    240 void
    241 uhid_intr(struct uhidev *addr, void *data, u_int len)
    242 {
    243 	struct uhid_softc *sc = (struct uhid_softc *)addr;
    244 
    245 #ifdef UHID_DEBUG
    246 	if (uhiddebug > 5) {
    247 		u_int32_t i;
    248 
    249 		DPRINTF(("uhid_intr: data ="));
    250 		for (i = 0; i < len; i++)
    251 			DPRINTF((" %02x", ((u_char *)data)[i]));
    252 		DPRINTF(("\n"));
    253 	}
    254 #endif
    255 
    256 	(void)b_to_q(data, len, &sc->sc_q);
    257 
    258 	if (sc->sc_state & UHID_ASLP) {
    259 		sc->sc_state &= ~UHID_ASLP;
    260 		DPRINTFN(5, ("uhid_intr: waking %p\n", &sc->sc_q));
    261 		wakeup(&sc->sc_q);
    262 	}
    263 	selnotify(&sc->sc_rsel, 0, 0);
    264 	if (sc->sc_async != NULL) {
    265 		DPRINTFN(3, ("uhid_intr: sending SIGIO %p\n", sc->sc_async));
    266 		softint_schedule(sc->sc_sih);
    267 	}
    268 }
    269 
    270 void
    271 uhid_softintr(void *cookie)
    272 {
    273 	struct uhid_softc *sc;
    274 
    275 	sc = cookie;
    276 
    277 	mutex_enter(proc_lock);
    278 	if (sc->sc_async != NULL)
    279 		 psignal(sc->sc_async, SIGIO);
    280 	mutex_exit(proc_lock);
    281 }
    282 
    283 int
    284 uhidopen(dev_t dev, int flag, int mode,
    285     struct lwp *l)
    286 {
    287 	struct uhid_softc *sc;
    288 	int error;
    289 
    290 	USB_GET_SC_OPEN(uhid, UHIDUNIT(dev), sc);
    291 
    292 	DPRINTF(("uhidopen: sc=%p\n", sc));
    293 
    294 	if (sc->sc_dying)
    295 		return (ENXIO);
    296 
    297 	error = uhidev_open(&sc->sc_hdev);
    298 	if (error)
    299 		return (error);
    300 
    301 	if (clalloc(&sc->sc_q, UHID_BSIZE, 0) == -1) {
    302 		uhidev_close(&sc->sc_hdev);
    303 		return (ENOMEM);
    304 	}
    305 	sc->sc_obuf = malloc(sc->sc_osize, M_USBDEV, M_WAITOK);
    306 	sc->sc_state &= ~UHID_IMMED;
    307 	mutex_enter(proc_lock);
    308 	sc->sc_async = NULL;
    309 	mutex_exit(proc_lock);
    310 
    311 	return (0);
    312 }
    313 
    314 int
    315 uhidclose(dev_t dev, int flag, int mode,
    316     struct lwp *l)
    317 {
    318 	struct uhid_softc *sc;
    319 
    320 	USB_GET_SC(uhid, UHIDUNIT(dev), sc);
    321 
    322 	DPRINTF(("uhidclose: sc=%p\n", sc));
    323 
    324 	clfree(&sc->sc_q);
    325 	free(sc->sc_obuf, M_USBDEV);
    326 	mutex_enter(proc_lock);
    327 	sc->sc_async = NULL;
    328 	mutex_exit(proc_lock);
    329 	uhidev_close(&sc->sc_hdev);
    330 
    331 	return (0);
    332 }
    333 
    334 int
    335 uhid_do_read(struct uhid_softc *sc, struct uio *uio, int flag)
    336 {
    337 	int s;
    338 	int error = 0;
    339 	int extra;
    340 	size_t length;
    341 	u_char buffer[UHID_CHUNK];
    342 	usbd_status err;
    343 
    344 	DPRINTFN(1, ("uhidread\n"));
    345 	if (sc->sc_state & UHID_IMMED) {
    346 		DPRINTFN(1, ("uhidread immed\n"));
    347 		extra = sc->sc_hdev.sc_report_id != 0;
    348 		err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT,
    349 					buffer, sc->sc_isize + extra);
    350 		if (err)
    351 			return (EIO);
    352 		return (uiomove(buffer+extra, sc->sc_isize, uio));
    353 	}
    354 
    355 	s = splusb();
    356 	while (sc->sc_q.c_cc == 0) {
    357 		if (flag & IO_NDELAY) {
    358 			splx(s);
    359 			return (EWOULDBLOCK);
    360 		}
    361 		sc->sc_state |= UHID_ASLP;
    362 		DPRINTFN(5, ("uhidread: sleep on %p\n", &sc->sc_q));
    363 		error = tsleep(&sc->sc_q, PZERO | PCATCH, "uhidrea", 0);
    364 		DPRINTFN(5, ("uhidread: woke, error=%d\n", error));
    365 		if (sc->sc_dying)
    366 			error = EIO;
    367 		if (error) {
    368 			sc->sc_state &= ~UHID_ASLP;
    369 			break;
    370 		}
    371 	}
    372 	splx(s);
    373 
    374 	/* Transfer as many chunks as possible. */
    375 	while (sc->sc_q.c_cc > 0 && uio->uio_resid > 0 && !error) {
    376 		length = min(sc->sc_q.c_cc, uio->uio_resid);
    377 		if (length > sizeof(buffer))
    378 			length = sizeof(buffer);
    379 
    380 		/* Remove a small chunk from the input queue. */
    381 		(void) q_to_b(&sc->sc_q, buffer, length);
    382 		DPRINTFN(5, ("uhidread: got %lu chars\n", (u_long)length));
    383 
    384 		/* Copy the data to the user process. */
    385 		if ((error = uiomove(buffer, length, uio)) != 0)
    386 			break;
    387 	}
    388 
    389 	return (error);
    390 }
    391 
    392 int
    393 uhidread(dev_t dev, struct uio *uio, int flag)
    394 {
    395 	struct uhid_softc *sc;
    396 	int error;
    397 
    398 	USB_GET_SC(uhid, UHIDUNIT(dev), sc);
    399 
    400 	sc->sc_refcnt++;
    401 	error = uhid_do_read(sc, uio, flag);
    402 	if (--sc->sc_refcnt < 0)
    403 		usb_detach_wakeup(USBDEV(sc->sc_hdev.sc_dev));
    404 	return (error);
    405 }
    406 
    407 int
    408 uhid_do_write(struct uhid_softc *sc, struct uio *uio, int flag)
    409 {
    410 	int error;
    411 	int size;
    412 	usbd_status err;
    413 
    414 	DPRINTFN(1, ("uhidwrite\n"));
    415 
    416 	if (sc->sc_dying)
    417 		return (EIO);
    418 
    419 	size = sc->sc_osize;
    420 	error = 0;
    421 	if (uio->uio_resid != size)
    422 		return (EINVAL);
    423 	error = uiomove(sc->sc_obuf, size, uio);
    424 	if (!error) {
    425 		err = uhidev_set_report(&sc->sc_hdev, UHID_OUTPUT_REPORT,
    426 					sc->sc_obuf, size);
    427 		if (err)
    428 			error = EIO;
    429 	}
    430 
    431 	return (error);
    432 }
    433 
    434 int
    435 uhidwrite(dev_t dev, struct uio *uio, int flag)
    436 {
    437 	struct uhid_softc *sc;
    438 	int error;
    439 
    440 	USB_GET_SC(uhid, UHIDUNIT(dev), sc);
    441 
    442 	sc->sc_refcnt++;
    443 	error = uhid_do_write(sc, uio, flag);
    444 	if (--sc->sc_refcnt < 0)
    445 		usb_detach_wakeup(USBDEV(sc->sc_hdev.sc_dev));
    446 	return (error);
    447 }
    448 
    449 int
    450 uhid_do_ioctl(struct uhid_softc *sc, u_long cmd, void *addr,
    451     int flag, struct lwp *l)
    452 {
    453 	struct usb_ctl_report_desc *rd;
    454 	struct usb_ctl_report *re;
    455 	u_char buffer[UHID_CHUNK];
    456 	int size, extra;
    457 	usbd_status err;
    458 	void *desc;
    459 
    460 	DPRINTFN(2, ("uhidioctl: cmd=%lx\n", cmd));
    461 
    462 	if (sc->sc_dying)
    463 		return (EIO);
    464 
    465 	switch (cmd) {
    466 	case FIONBIO:
    467 		/* All handled in the upper FS layer. */
    468 		break;
    469 
    470 	case FIOASYNC:
    471 		mutex_enter(proc_lock);
    472 		if (*(int *)addr) {
    473 			if (sc->sc_async != NULL)
    474 				return (EBUSY);
    475 			sc->sc_async = l->l_proc;
    476 			DPRINTF(("uhid_do_ioctl: FIOASYNC %p\n", l->l_proc));
    477 		} else
    478 			sc->sc_async = NULL;
    479 		mutex_exit(proc_lock);
    480 		break;
    481 
    482 	/* XXX this is not the most general solution. */
    483 	case TIOCSPGRP:
    484 		mutex_enter(proc_lock);
    485 		if (sc->sc_async == NULL) {
    486 			mutex_exit(proc_lock);
    487 			return (EINVAL);
    488 		}
    489 		if (*(int *)addr != sc->sc_async->p_pgid) {
    490 			mutex_exit(proc_lock);
    491 			return (EPERM);
    492 		}
    493 		mutex_exit(proc_lock);
    494 		break;
    495 
    496 	case FIOSETOWN:
    497 		mutex_enter(proc_lock);
    498 		if (sc->sc_async == NULL) {
    499 			mutex_exit(proc_lock);
    500 			return (EINVAL);
    501 		}
    502 		if (-*(int *)addr != sc->sc_async->p_pgid
    503 		    && *(int *)addr != sc->sc_async->p_pid) {
    504 			mutex_exit(proc_lock);
    505 			return (EPERM);
    506 		}
    507 		mutex_exit(proc_lock);
    508 		break;
    509 
    510 	case USB_GET_REPORT_DESC:
    511 		uhidev_get_report_desc(sc->sc_hdev.sc_parent, &desc, &size);
    512 		rd = (struct usb_ctl_report_desc *)addr;
    513 		size = min(size, sizeof rd->ucrd_data);
    514 		rd->ucrd_size = size;
    515 		memcpy(rd->ucrd_data, desc, size);
    516 		break;
    517 
    518 	case USB_SET_IMMED:
    519 		if (*(int *)addr) {
    520 			extra = sc->sc_hdev.sc_report_id != 0;
    521 			err = uhidev_get_report(&sc->sc_hdev, UHID_INPUT_REPORT,
    522 						buffer, sc->sc_isize + extra);
    523 			if (err)
    524 				return (EOPNOTSUPP);
    525 
    526 			sc->sc_state |=  UHID_IMMED;
    527 		} else
    528 			sc->sc_state &= ~UHID_IMMED;
    529 		break;
    530 
    531 	case USB_GET_REPORT:
    532 		re = (struct usb_ctl_report *)addr;
    533 		switch (re->ucr_report) {
    534 		case UHID_INPUT_REPORT:
    535 			size = sc->sc_isize;
    536 			break;
    537 		case UHID_OUTPUT_REPORT:
    538 			size = sc->sc_osize;
    539 			break;
    540 		case UHID_FEATURE_REPORT:
    541 			size = sc->sc_fsize;
    542 			break;
    543 		default:
    544 			return (EINVAL);
    545 		}
    546 		extra = sc->sc_hdev.sc_report_id != 0;
    547 		err = uhidev_get_report(&sc->sc_hdev, re->ucr_report,
    548 		    re->ucr_data, size + extra);
    549 		if (extra)
    550 			memcpy(re->ucr_data, re->ucr_data+1, size);
    551 		if (err)
    552 			return (EIO);
    553 		break;
    554 
    555 	case USB_SET_REPORT:
    556 		re = (struct usb_ctl_report *)addr;
    557 		switch (re->ucr_report) {
    558 		case UHID_INPUT_REPORT:
    559 			size = sc->sc_isize;
    560 			break;
    561 		case UHID_OUTPUT_REPORT:
    562 			size = sc->sc_osize;
    563 			break;
    564 		case UHID_FEATURE_REPORT:
    565 			size = sc->sc_fsize;
    566 			break;
    567 		default:
    568 			return (EINVAL);
    569 		}
    570 		err = uhidev_set_report(&sc->sc_hdev, re->ucr_report,
    571 		    re->ucr_data, size);
    572 		if (err)
    573 			return (EIO);
    574 		break;
    575 
    576 	case USB_GET_REPORT_ID:
    577 		*(int *)addr = sc->sc_hdev.sc_report_id;
    578 		break;
    579 
    580 	case USB_GET_DEVICEINFO:
    581 		usbd_fill_deviceinfo(sc->sc_hdev.sc_parent->sc_udev,
    582 			             (struct usb_device_info *)addr, 0);
    583 		break;
    584 #ifdef COMPAT_30
    585 	case USB_GET_DEVICEINFO_OLD:
    586 		usbd_fill_deviceinfo_old(sc->sc_hdev.sc_parent->sc_udev,
    587 					 (struct usb_device_info_old *)addr, 0);
    588 
    589 		break;
    590 #endif
    591         case USB_GET_STRING_DESC:
    592 	    {
    593                 struct usb_string_desc *si = (struct usb_string_desc *)addr;
    594                 err = usbd_get_string_desc(sc->sc_hdev.sc_parent->sc_udev,
    595 			si->usd_string_index,
    596                 	si->usd_language_id, &si->usd_desc, &size);
    597                 if (err)
    598                         return (EINVAL);
    599                 break;
    600 	    }
    601 
    602 	default:
    603 		return (EINVAL);
    604 	}
    605 	return (0);
    606 }
    607 
    608 int
    609 uhidioctl(dev_t dev, u_long cmd, void *addr, int flag, struct lwp *l)
    610 {
    611 	struct uhid_softc *sc;
    612 	int error;
    613 
    614 	USB_GET_SC(uhid, UHIDUNIT(dev), sc);
    615 
    616 	sc->sc_refcnt++;
    617 	error = uhid_do_ioctl(sc, cmd, addr, flag, l);
    618 	if (--sc->sc_refcnt < 0)
    619 		usb_detach_wakeup(USBDEV(sc->sc_hdev.sc_dev));
    620 	return (error);
    621 }
    622 
    623 int
    624 uhidpoll(dev_t dev, int events, struct lwp *l)
    625 {
    626 	struct uhid_softc *sc;
    627 	int revents = 0;
    628 	int s;
    629 
    630 	USB_GET_SC(uhid, UHIDUNIT(dev), sc);
    631 
    632 	if (sc->sc_dying)
    633 		return (POLLHUP);
    634 
    635 	s = splusb();
    636 	if (events & (POLLOUT | POLLWRNORM))
    637 		revents |= events & (POLLOUT | POLLWRNORM);
    638 	if (events & (POLLIN | POLLRDNORM)) {
    639 		if (sc->sc_q.c_cc > 0)
    640 			revents |= events & (POLLIN | POLLRDNORM);
    641 		else
    642 			selrecord(l, &sc->sc_rsel);
    643 	}
    644 
    645 	splx(s);
    646 	return (revents);
    647 }
    648 
    649 static void
    650 filt_uhidrdetach(struct knote *kn)
    651 {
    652 	struct uhid_softc *sc = kn->kn_hook;
    653 	int s;
    654 
    655 	s = splusb();
    656 	SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext);
    657 	splx(s);
    658 }
    659 
    660 static int
    661 filt_uhidread(struct knote *kn, long hint)
    662 {
    663 	struct uhid_softc *sc = kn->kn_hook;
    664 
    665 	kn->kn_data = sc->sc_q.c_cc;
    666 	return (kn->kn_data > 0);
    667 }
    668 
    669 static const struct filterops uhidread_filtops =
    670 	{ 1, NULL, filt_uhidrdetach, filt_uhidread };
    671 
    672 static const struct filterops uhid_seltrue_filtops =
    673 	{ 1, NULL, filt_uhidrdetach, filt_seltrue };
    674 
    675 int
    676 uhidkqfilter(dev_t dev, struct knote *kn)
    677 {
    678 	struct uhid_softc *sc;
    679 	struct klist *klist;
    680 	int s;
    681 
    682 	USB_GET_SC(uhid, UHIDUNIT(dev), sc);
    683 
    684 	if (sc->sc_dying)
    685 		return (ENXIO);
    686 
    687 	switch (kn->kn_filter) {
    688 	case EVFILT_READ:
    689 		klist = &sc->sc_rsel.sel_klist;
    690 		kn->kn_fop = &uhidread_filtops;
    691 		break;
    692 
    693 	case EVFILT_WRITE:
    694 		klist = &sc->sc_rsel.sel_klist;
    695 		kn->kn_fop = &uhid_seltrue_filtops;
    696 		break;
    697 
    698 	default:
    699 		return (EINVAL);
    700 	}
    701 
    702 	kn->kn_hook = sc;
    703 
    704 	s = splusb();
    705 	SLIST_INSERT_HEAD(klist, kn, kn_selnext);
    706 	splx(s);
    707 
    708 	return (0);
    709 }
    710