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apm.c revision 1.16.26.2
      1  1.16.26.2       mjf /*	$NetBSD: apm.c,v 1.16.26.2 2007/12/27 00:43:13 mjf Exp $	*/
      2        1.1    itojun /*	$OpenBSD: apm.c,v 1.5 2002/06/07 07:13:59 miod Exp $	*/
      3        1.1    itojun 
      4        1.1    itojun /*-
      5        1.1    itojun  * Copyright (c) 2001 Alexander Guy.  All rights reserved.
      6        1.1    itojun  * Copyright (c) 1998-2001 Michael Shalayeff. All rights reserved.
      7        1.1    itojun  * Copyright (c) 1995 John T. Kohl.  All rights reserved.
      8        1.1    itojun  *
      9        1.1    itojun  * Redistribution and use in source and binary forms, with or without
     10        1.1    itojun  * modification, are permitted provided that the following conditions
     11        1.1    itojun  * are met:
     12        1.1    itojun  * 1. Redistributions of source code must retain the above copyright
     13        1.1    itojun  *    notice, this list of conditions and the following disclaimer.
     14        1.1    itojun  * 2. Redistributions in binary form must reproduce the above copyright
     15        1.1    itojun  *    notice, this list of conditions and the following disclaimer in the
     16        1.1    itojun  *    documentation and/or other materials provided with the distribution.
     17  1.16.26.2       mjf  * 3. Neither the names of the authors nor the names of contributors
     18        1.1    itojun  *    may be used to endorse or promote products derived from this software
     19        1.1    itojun  *    without specific prior written permission.
     20        1.1    itojun  *
     21  1.16.26.2       mjf  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
     22        1.1    itojun  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23        1.1    itojun  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  1.16.26.2       mjf  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
     25        1.1    itojun  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26        1.1    itojun  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27        1.1    itojun  * OR SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28        1.1    itojun  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29        1.1    itojun  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30        1.1    itojun  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31        1.1    itojun  * SUCH DAMAGE.
     32        1.1    itojun  *
     33        1.1    itojun  */
     34        1.9     lukem 
     35        1.9     lukem #include <sys/cdefs.h>
     36  1.16.26.2       mjf __KERNEL_RCSID(0, "$NetBSD: apm.c,v 1.16.26.2 2007/12/27 00:43:13 mjf Exp $");
     37        1.1    itojun 
     38        1.1    itojun #include "apm.h"
     39        1.1    itojun 
     40        1.1    itojun #if NAPM > 1
     41        1.1    itojun #error only one APM emulation device may be configured
     42        1.1    itojun #endif
     43        1.1    itojun 
     44        1.1    itojun #include <sys/param.h>
     45        1.1    itojun #include <sys/systm.h>
     46        1.1    itojun #include <sys/kernel.h>
     47        1.1    itojun #include <sys/proc.h>
     48        1.1    itojun #include <sys/device.h>
     49        1.1    itojun #include <sys/fcntl.h>
     50        1.1    itojun #include <sys/ioctl.h>
     51  1.16.26.1       mjf #include <sys/mutex.h>
     52        1.1    itojun #ifdef __OpenBSD__
     53        1.1    itojun #include <sys/event.h>
     54        1.1    itojun #endif
     55        1.1    itojun #ifdef __NetBSD__
     56        1.1    itojun #include <sys/select.h>
     57        1.1    itojun #include <sys/poll.h>
     58        1.1    itojun #include <sys/conf.h>
     59        1.1    itojun #endif
     60        1.1    itojun 
     61        1.1    itojun #ifdef __OpenBSD__
     62        1.1    itojun #include <machine/conf.h>
     63        1.1    itojun #endif
     64        1.1    itojun #include <machine/cpu.h>
     65        1.1    itojun #include <machine/apmvar.h>
     66        1.1    itojun 
     67        1.1    itojun #include <macppc/dev/adbvar.h>
     68        1.1    itojun #include <macppc/dev/pm_direct.h>
     69        1.1    itojun 
     70        1.1    itojun #if defined(APMDEBUG)
     71        1.1    itojun #define DPRINTF(x)	printf x
     72        1.1    itojun #else
     73        1.1    itojun #define	DPRINTF(x)	/**/
     74        1.1    itojun #endif
     75        1.1    itojun 
     76        1.1    itojun #define APM_NEVENTS 16
     77        1.1    itojun 
     78        1.1    itojun struct apm_softc {
     79        1.1    itojun 	struct device sc_dev;
     80        1.1    itojun 	struct selinfo sc_rsel;
     81        1.1    itojun #ifdef __OpenBSD__
     82        1.1    itojun 	struct klist sc_note;
     83        1.1    itojun #endif
     84        1.1    itojun 	int    sc_flags;
     85        1.1    itojun 	int	event_count;
     86        1.1    itojun 	int	event_ptr;
     87  1.16.26.1       mjf 	kmutex_t sc_lock;
     88        1.1    itojun 	struct	apm_event_info event_list[APM_NEVENTS];
     89        1.1    itojun };
     90        1.1    itojun 
     91        1.1    itojun /*
     92        1.1    itojun  * A brief note on the locking protocol: it's very simple; we
     93        1.1    itojun  * assert an exclusive lock any time thread context enters the
     94        1.1    itojun  * APM module.  This is both the APM thread itself, as well as
     95        1.1    itojun  * user context.
     96        1.1    itojun  */
     97        1.1    itojun #ifdef __NetBSD__
     98  1.16.26.1       mjf #define	APM_LOCK(apmsc)		mutex_enter(&(apmsc)->sc_lock)
     99  1.16.26.1       mjf #define	APM_UNLOCK(apmsc)	mutex_exit(&(apmsc)->sc_lock)
    100        1.1    itojun #else
    101        1.1    itojun #define APM_LOCK(apmsc)
    102        1.1    itojun #define APM_UNLOCK(apmsc)
    103        1.1    itojun #endif
    104        1.1    itojun 
    105        1.1    itojun int apmmatch(struct device *, struct cfdata *, void *);
    106        1.1    itojun void apmattach(struct device *, struct device *, void *);
    107        1.1    itojun 
    108        1.1    itojun #ifdef __NetBSD__
    109        1.1    itojun #if 0
    110        1.1    itojun static int	apm_record_event __P((struct apm_softc *, u_int));
    111        1.1    itojun #endif
    112        1.1    itojun #endif
    113        1.1    itojun 
    114        1.4   thorpej CFATTACH_DECL(apm, sizeof(struct apm_softc),
    115        1.4   thorpej     apmmatch, apmattach, NULL, NULL);
    116        1.1    itojun 
    117        1.1    itojun #ifdef __OpenBSD__
    118        1.1    itojun struct cfdriver apm_cd = {
    119        1.1    itojun 	NULL, "apm", DV_DULL
    120        1.1    itojun };
    121        1.1    itojun #else
    122        1.1    itojun extern struct cfdriver apm_cd;
    123        1.2   gehenna 
    124        1.2   gehenna dev_type_open(apmopen);
    125        1.2   gehenna dev_type_close(apmclose);
    126        1.2   gehenna dev_type_ioctl(apmioctl);
    127        1.2   gehenna dev_type_poll(apmpoll);
    128        1.5  jdolecek dev_type_kqfilter(apmkqfilter);
    129        1.2   gehenna 
    130        1.2   gehenna const struct cdevsw apm_cdevsw = {
    131        1.2   gehenna 	apmopen, apmclose, noread, nowrite, apmioctl,
    132        1.5  jdolecek 	nostop, notty, apmpoll, nommap, apmkqfilter,
    133        1.2   gehenna };
    134        1.1    itojun #endif
    135        1.1    itojun 
    136        1.1    itojun int	apm_evindex;
    137        1.1    itojun 
    138        1.1    itojun #define	APMUNIT(dev)	(minor(dev)&0xf0)
    139        1.1    itojun #define	APMDEV(dev)	(minor(dev)&0x0f)
    140        1.1    itojun #define APMDEV_NORMAL	0
    141        1.1    itojun #define APMDEV_CTL	8
    142        1.1    itojun 
    143        1.1    itojun /*
    144        1.1    itojun  * Flags to control kernel display
    145        1.1    itojun  *	SCFLAG_NOPRINT:		do not output APM power messages due to
    146        1.1    itojun  *				a power change event.
    147        1.1    itojun  *
    148        1.1    itojun  *	SCFLAG_PCTPRINT:	do not output APM power messages due to
    149        1.1    itojun  *				to a power change event unless the battery
    150        1.1    itojun  *				percentage changes.
    151        1.1    itojun  */
    152        1.1    itojun 
    153        1.1    itojun #define SCFLAG_NOPRINT	0x0008000
    154        1.1    itojun #define SCFLAG_PCTPRINT	0x0004000
    155        1.1    itojun #define SCFLAG_PRINT	(SCFLAG_NOPRINT|SCFLAG_PCTPRINT)
    156        1.1    itojun 
    157        1.1    itojun #define	SCFLAG_OREAD 	(1 << 0)
    158        1.1    itojun #define	SCFLAG_OWRITE	(1 << 1)
    159        1.1    itojun #define	SCFLAG_OPEN	(SCFLAG_OREAD|SCFLAG_OWRITE)
    160        1.1    itojun 
    161        1.1    itojun 
    162        1.1    itojun int
    163        1.1    itojun apmmatch(parent, match, aux)
    164        1.1    itojun 	struct device *parent;
    165        1.1    itojun 	struct cfdata *match;
    166        1.1    itojun 	void *aux;
    167        1.1    itojun {
    168        1.1    itojun 	struct adb_attach_args *aa = (void *)aux;
    169        1.1    itojun 	if (aa->origaddr != ADBADDR_APM ||
    170        1.1    itojun 	    aa->handler_id != ADBADDR_APM ||
    171        1.1    itojun 	    aa->adbaddr != ADBADDR_APM)
    172        1.1    itojun 		return 0;
    173        1.1    itojun 
    174       1.12    briggs 	if (adbHardware != ADB_HW_PMU)
    175        1.1    itojun 		return 0;
    176        1.1    itojun 
    177        1.1    itojun 	return 1;
    178        1.1    itojun }
    179        1.1    itojun 
    180        1.1    itojun void
    181        1.1    itojun apmattach(parent, self, aux)
    182        1.1    itojun 	struct device *parent, *self;
    183        1.1    itojun 	void *aux;
    184        1.1    itojun {
    185       1.10   aymeric 	struct apm_softc *sc = (struct apm_softc *) self;
    186        1.1    itojun 	struct pmu_battery_info info;
    187        1.1    itojun 
    188        1.1    itojun 	pm_battery_info(0, &info);
    189        1.1    itojun 
    190        1.1    itojun 	printf(": battery flags 0x%X, ", info.flags);
    191        1.1    itojun 	printf("%d%% charged\n", ((info.cur_charge * 100) / info.max_charge));
    192       1.10   aymeric 
    193       1.10   aymeric 	sc->sc_flags = 0;
    194       1.10   aymeric 	sc->event_ptr = 0;
    195       1.10   aymeric 	sc->event_count = 0;
    196  1.16.26.1       mjf 	mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
    197        1.1    itojun }
    198        1.1    itojun 
    199        1.1    itojun int
    200       1.15  christos apmopen(dev, flag, mode, l)
    201        1.1    itojun 	dev_t dev;
    202        1.1    itojun 	int flag, mode;
    203       1.15  christos 	struct lwp *l;
    204        1.1    itojun {
    205        1.1    itojun 	struct apm_softc *sc;
    206        1.1    itojun 	int error = 0;
    207        1.1    itojun 
    208        1.1    itojun 	/* apm0 only */
    209        1.1    itojun 	if (!apm_cd.cd_ndevs || APMUNIT(dev) != 0 ||
    210        1.1    itojun 	    !(sc = apm_cd.cd_devs[APMUNIT(dev)]))
    211        1.1    itojun 		return ENXIO;
    212        1.1    itojun 
    213        1.1    itojun 	DPRINTF(("apmopen: dev %d pid %d flag %x mode %x\n",
    214       1.15  christos 	    APMDEV(dev), l->l_proc->p_pid, flag, mode));
    215        1.1    itojun 
    216        1.1    itojun 	APM_LOCK(sc);
    217        1.1    itojun 	switch (APMDEV(dev)) {
    218        1.1    itojun 	case APMDEV_CTL:
    219        1.1    itojun 		if (!(flag & FWRITE)) {
    220        1.1    itojun 			error = EINVAL;
    221        1.1    itojun 			break;
    222        1.1    itojun 		}
    223        1.1    itojun 		if (sc->sc_flags & SCFLAG_OWRITE) {
    224        1.1    itojun 			error = EBUSY;
    225        1.1    itojun 			break;
    226        1.1    itojun 		}
    227        1.1    itojun 		sc->sc_flags |= SCFLAG_OWRITE;
    228        1.1    itojun 		break;
    229        1.1    itojun 	case APMDEV_NORMAL:
    230        1.1    itojun 		if (!(flag & FREAD) || (flag & FWRITE)) {
    231        1.1    itojun 			error = EINVAL;
    232        1.1    itojun 			break;
    233        1.1    itojun 		}
    234        1.1    itojun 		sc->sc_flags |= SCFLAG_OREAD;
    235        1.1    itojun 		break;
    236        1.1    itojun 	default:
    237        1.1    itojun 		error = ENXIO;
    238        1.1    itojun 		break;
    239        1.1    itojun 	}
    240        1.1    itojun 	APM_UNLOCK(sc);
    241        1.1    itojun 	return error;
    242        1.1    itojun }
    243        1.1    itojun 
    244        1.1    itojun int
    245       1.15  christos apmclose(dev, flag, mode, l)
    246        1.1    itojun 	dev_t dev;
    247        1.1    itojun 	int flag, mode;
    248       1.15  christos 	struct lwp *l;
    249        1.1    itojun {
    250        1.1    itojun 	struct apm_softc *sc;
    251        1.1    itojun 
    252        1.1    itojun 	/* apm0 only */
    253        1.1    itojun 	if (!apm_cd.cd_ndevs || APMUNIT(dev) != 0 ||
    254        1.1    itojun 	    !(sc = apm_cd.cd_devs[APMUNIT(dev)]))
    255        1.1    itojun 		return ENXIO;
    256        1.1    itojun 
    257       1.15  christos 	DPRINTF(("apmclose: pid %d flag %x mode %x\n", l->l_proc->p_pid, flag, mode));
    258        1.1    itojun 
    259        1.1    itojun 	APM_LOCK(sc);
    260        1.1    itojun 	switch (APMDEV(dev)) {
    261        1.1    itojun 	case APMDEV_CTL:
    262        1.1    itojun 		sc->sc_flags &= ~SCFLAG_OWRITE;
    263        1.1    itojun 		break;
    264        1.1    itojun 	case APMDEV_NORMAL:
    265        1.1    itojun 		sc->sc_flags &= ~SCFLAG_OREAD;
    266        1.1    itojun 		break;
    267        1.1    itojun 	}
    268        1.1    itojun 	APM_UNLOCK(sc);
    269        1.1    itojun 	return 0;
    270        1.1    itojun }
    271        1.1    itojun 
    272        1.1    itojun int
    273       1.15  christos apmioctl(dev, cmd, data, flag, l)
    274        1.1    itojun 	dev_t dev;
    275        1.1    itojun 	u_long cmd;
    276       1.16  christos 	void *data;
    277        1.1    itojun 	int flag;
    278       1.15  christos 	struct lwp *l;
    279        1.1    itojun {
    280        1.1    itojun 	struct apm_softc *sc;
    281        1.1    itojun 	struct pmu_battery_info batt;
    282        1.1    itojun 	struct apm_power_info *power;
    283        1.1    itojun 	int error = 0;
    284        1.1    itojun 
    285        1.1    itojun 	/* apm0 only */
    286        1.1    itojun 	if (!apm_cd.cd_ndevs || APMUNIT(dev) != 0 ||
    287        1.1    itojun 	    !(sc = apm_cd.cd_devs[APMUNIT(dev)]))
    288        1.1    itojun 		return ENXIO;
    289        1.1    itojun 
    290        1.1    itojun 	APM_LOCK(sc);
    291        1.1    itojun 	switch (cmd) {
    292        1.1    itojun 		/* some ioctl names from linux */
    293        1.1    itojun 	case APM_IOC_STANDBY:
    294        1.1    itojun 		if ((flag & FWRITE) == 0)
    295        1.1    itojun 			error = EBADF;
    296        1.1    itojun 	case APM_IOC_SUSPEND:
    297        1.1    itojun 		if ((flag & FWRITE) == 0)
    298        1.1    itojun 			error = EBADF;
    299        1.1    itojun 		break;
    300        1.1    itojun 	case APM_IOC_PRN_CTL:
    301        1.1    itojun 		if ((flag & FWRITE) == 0)
    302        1.1    itojun 			error = EBADF;
    303        1.1    itojun 		else {
    304       1.14   nathanw 			int op = *(int *)data;
    305       1.14   nathanw 			DPRINTF(( "APM_IOC_PRN_CTL: %d\n", op ));
    306       1.14   nathanw 			switch (op) {
    307        1.1    itojun 			case APM_PRINT_ON:	/* enable printing */
    308        1.1    itojun 				sc->sc_flags &= ~SCFLAG_PRINT;
    309        1.1    itojun 				break;
    310        1.1    itojun 			case APM_PRINT_OFF: /* disable printing */
    311        1.1    itojun 				sc->sc_flags &= ~SCFLAG_PRINT;
    312        1.1    itojun 				sc->sc_flags |= SCFLAG_NOPRINT;
    313        1.1    itojun 				break;
    314        1.1    itojun 			case APM_PRINT_PCT: /* disable some printing */
    315        1.1    itojun 				sc->sc_flags &= ~SCFLAG_PRINT;
    316        1.1    itojun 				sc->sc_flags |= SCFLAG_PCTPRINT;
    317        1.1    itojun 				break;
    318        1.1    itojun 			default:
    319        1.1    itojun 				error = EINVAL;
    320        1.1    itojun 				break;
    321        1.1    itojun 			}
    322        1.1    itojun 		}
    323        1.1    itojun 		break;
    324        1.1    itojun 	case APM_IOC_DEV_CTL:
    325        1.1    itojun 		if ((flag & FWRITE) == 0)
    326        1.1    itojun 			error = EBADF;
    327        1.1    itojun 		break;
    328        1.1    itojun 	case APM_IOC_GETPOWER:
    329        1.1    itojun 	        power = (struct apm_power_info *)data;
    330        1.1    itojun 
    331        1.1    itojun 		pm_battery_info(0, &batt);
    332        1.1    itojun 
    333        1.1    itojun 		power->ac_state = ((batt.flags & PMU_PWR_AC_PRESENT) ?
    334        1.1    itojun 		    APM_AC_ON : APM_AC_OFF);
    335        1.1    itojun 		power->battery_life =
    336        1.1    itojun 		    ((batt.cur_charge * 100) / batt.max_charge);
    337        1.1    itojun 
    338        1.1    itojun 		/*
    339        1.1    itojun 		 * If the battery is charging, return the minutes left until
    340        1.1    itojun 		 * charging is complete. apmd knows this.
    341        1.1    itojun 		 */
    342        1.1    itojun 
    343        1.1    itojun 		if (!(batt.flags & PMU_PWR_BATT_PRESENT)) {
    344        1.1    itojun 			power->battery_state = APM_BATT_UNKNOWN;
    345        1.1    itojun 			power->minutes_left = 0;
    346        1.1    itojun 			power->battery_life = 0;
    347        1.1    itojun 		} else if ((power->ac_state == APM_AC_ON) &&
    348        1.1    itojun 			   (batt.draw > 0)) {
    349       1.13    briggs 			power->minutes_left = batt.secs_remaining / 60;
    350        1.1    itojun 			power->battery_state = APM_BATT_CHARGING;
    351        1.1    itojun 		} else {
    352       1.13    briggs 			power->minutes_left = batt.secs_remaining / 60;
    353        1.1    itojun 
    354        1.1    itojun 			/* XXX - Arbitrary */
    355        1.1    itojun 			if (power->battery_life > 60) {
    356        1.1    itojun 				power->battery_state = APM_BATT_HIGH;
    357        1.1    itojun 			} else if (power->battery_life < 10) {
    358        1.1    itojun 				power->battery_state = APM_BATT_CRITICAL;
    359        1.1    itojun 			} else {
    360        1.1    itojun 				power->battery_state = APM_BATT_LOW;
    361        1.1    itojun 			}
    362        1.1    itojun 		}
    363        1.1    itojun 
    364        1.1    itojun 		break;
    365        1.1    itojun 
    366        1.1    itojun 	default:
    367        1.1    itojun 		error = ENOTTY;
    368        1.1    itojun 	}
    369        1.1    itojun 	APM_UNLOCK(sc);
    370        1.1    itojun 
    371        1.1    itojun 	return error;
    372        1.1    itojun }
    373        1.1    itojun 
    374        1.1    itojun #ifdef __NetBSD__
    375        1.1    itojun #if 0
    376        1.1    itojun /*
    377        1.1    itojun  * return 0 if the user will notice and handle the event,
    378        1.1    itojun  * return 1 if the kernel driver should do so.
    379        1.1    itojun  */
    380        1.1    itojun static int
    381        1.1    itojun apm_record_event(sc, event_type)
    382        1.1    itojun 	struct apm_softc *sc;
    383        1.1    itojun 	u_int event_type;
    384        1.1    itojun {
    385        1.1    itojun 	struct apm_event_info *evp;
    386        1.1    itojun 
    387        1.1    itojun 	if ((sc->sc_flags & SCFLAG_OPEN) == 0)
    388        1.1    itojun 		return 1;		/* no user waiting */
    389        1.1    itojun 	if (sc->event_count == APM_NEVENTS) {
    390        1.1    itojun 		DPRINTF(("apm_record_event: queue full!\n"));
    391        1.1    itojun 		return 1;			/* overflow */
    392        1.1    itojun 	}
    393        1.1    itojun 	evp = &sc->event_list[sc->event_ptr];
    394        1.1    itojun 	sc->event_count++;
    395        1.1    itojun 	sc->event_ptr++;
    396        1.1    itojun 	sc->event_ptr %= APM_NEVENTS;
    397        1.1    itojun 	evp->type = event_type;
    398        1.1    itojun 	evp->index = ++apm_evindex;
    399        1.1    itojun 	selwakeup(&sc->sc_rsel);
    400        1.1    itojun 	return (sc->sc_flags & SCFLAG_OWRITE) ? 0 : 1; /* user may handle */
    401        1.1    itojun }
    402        1.1    itojun #endif
    403        1.1    itojun 
    404        1.1    itojun int
    405       1.15  christos apmpoll(dev, events, l)
    406        1.1    itojun 	dev_t dev;
    407        1.1    itojun 	int events;
    408       1.15  christos 	struct lwp *l;
    409        1.1    itojun {
    410        1.1    itojun 	struct apm_softc *sc = apm_cd.cd_devs[APMUNIT(dev)];
    411        1.1    itojun 	int revents = 0;
    412        1.1    itojun 
    413        1.1    itojun 	APM_LOCK(sc);
    414        1.1    itojun 	if (events & (POLLIN | POLLRDNORM)) {
    415        1.1    itojun 		if (sc->event_count)
    416        1.1    itojun 			revents |= events & (POLLIN | POLLRDNORM);
    417        1.1    itojun 		else
    418       1.15  christos 			selrecord(l, &sc->sc_rsel);
    419        1.1    itojun 	}
    420        1.1    itojun 	APM_UNLOCK(sc);
    421        1.1    itojun 
    422        1.1    itojun 	return (revents);
    423        1.1    itojun }
    424        1.1    itojun #endif
    425        1.1    itojun 
    426        1.5  jdolecek static void
    427        1.5  jdolecek filt_apmrdetach(struct knote *kn)
    428        1.1    itojun {
    429        1.1    itojun 	struct apm_softc *sc = (struct apm_softc *)kn->kn_hook;
    430        1.1    itojun 
    431        1.5  jdolecek 	APM_LOCK(sc);
    432        1.6  christos 	SLIST_REMOVE(&sc->sc_rsel.sel_klist, kn, knote, kn_selnext);
    433        1.5  jdolecek 	APM_UNLOCK(sc);
    434        1.1    itojun }
    435        1.1    itojun 
    436        1.5  jdolecek static int
    437        1.5  jdolecek filt_apmread(struct knote *kn, long hint)
    438        1.1    itojun {
    439        1.5  jdolecek 	struct apm_softc *sc = kn->kn_hook;
    440        1.1    itojun 
    441        1.5  jdolecek 	kn->kn_data = sc->event_count;
    442        1.5  jdolecek 	return (kn->kn_data > 0);
    443        1.1    itojun }
    444        1.1    itojun 
    445        1.5  jdolecek static struct filterops apmread_filtops =
    446        1.5  jdolecek 	{ 1, NULL, filt_apmrdetach, filt_apmread};
    447        1.5  jdolecek 
    448        1.1    itojun int
    449        1.1    itojun apmkqfilter(dev, kn)
    450        1.1    itojun 	dev_t dev;
    451        1.1    itojun 	struct knote *kn;
    452        1.1    itojun {
    453        1.5  jdolecek 	struct apm_softc *sc = apm_cd.cd_devs[APMUNIT(dev)];
    454        1.5  jdolecek 	struct klist *klist;
    455        1.1    itojun 
    456        1.1    itojun 	switch (kn->kn_filter) {
    457        1.1    itojun 	case EVFILT_READ:
    458        1.6  christos 		klist = &sc->sc_rsel.sel_klist;
    459        1.1    itojun 		kn->kn_fop = &apmread_filtops;
    460        1.1    itojun 		break;
    461        1.1    itojun 	default:
    462        1.1    itojun 		return (1);
    463        1.1    itojun 	}
    464        1.1    itojun 
    465        1.5  jdolecek 	kn->kn_hook = sc;
    466        1.5  jdolecek 
    467        1.5  jdolecek 	APM_LOCK(sc);
    468        1.5  jdolecek 	SLIST_INSERT_HEAD(klist, kn, kn_selnext);
    469        1.5  jdolecek 	APM_UNLOCK(sc);
    470        1.1    itojun 
    471        1.1    itojun 	return (0);
    472        1.1    itojun }
    473