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NetBSD/sys/dev/apm/apm.c

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/* $NetBSD: apm.c,v 1.1 2000/07/02 09:48:12 takemura Exp $ */
/*-
* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by John Kohl and Christopher G. Demetriou.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* from: sys/arch/i386/i386/apm.c,v 1.49 2000/05/08
*/
#include "opt_apm.h"
#ifdef APM_NOIDLE
#error APM_NOIDLE option deprecated; use APM_NO_IDLE instead
#endif
#if defined(DEBUG) && !defined(APMDEBUG)
#define APMDEBUG
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/kernel.h>
#include <sys/map.h>
#include <sys/proc.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/user.h>
#include <sys/malloc.h>
#include <sys/device.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/poll.h>
#include <sys/conf.h>
#include <dev/apm/apmvar.h>
#include <machine/stdarg.h>
#define APMDEBUG
#if defined(APMDEBUG)
#define DPRINTF(f, x) do { if (apmdebug & (f)) printf x; } while (0)
#define APMDEBUG_INFO 0x01
#define APMDEBUG_APMCALLS 0x02
#define APMDEBUG_EVENTS 0x04
#define APMDEBUG_PROBE 0x10
#define APMDEBUG_ATTACH 0x40
#define APMDEBUG_DEVICE 0x20
#define APMDEBUG_ANOM 0x40
#ifdef APMDEBUG_VALUE
int apmdebug = APMDEBUG_VALUE;
#else
int apmdebug = 0;
#endif
#else
#define DPRINTF(f, x) /**/
#endif
#define APM_NEVENTS 16
struct apm_softc {
struct device sc_dev;
struct selinfo sc_rsel;
struct selinfo sc_xsel;
int sc_flags;
int event_count;
int event_ptr;
int sc_power_state;
struct proc *sc_thread;
struct lock sc_lock;
struct apm_event_info event_list[APM_NEVENTS];
struct apm_accessops *ops;
void *cookie;
};
#define SCFLAG_OREAD 0x0000001
#define SCFLAG_OWRITE 0x0000002
#define SCFLAG_OPEN (SCFLAG_OREAD|SCFLAG_OWRITE)
#define APMUNIT(dev) (minor(dev)&0xf0)
#define APMDEV(dev) (minor(dev)&0x0f)
#define APMDEV_NORMAL 0
#define APMDEV_CTL 8
/*
* A brief note on the locking protocol: it's very simple; we
* assert an exclusive lock any time thread context enters the
* APM module. This is both the APM thread itself, as well as
* user context.
*/
#define APM_LOCK(apmsc) \
(void) lockmgr(&(apmsc)->sc_lock, LK_EXCLUSIVE, NULL)
#define APM_UNLOCK(apmsc) \
(void) lockmgr(&(apmsc)->sc_lock, LK_RELEASE, NULL)
static void apmattach __P((struct device *, struct device *, void *));
static int apmmatch __P((struct device *, struct cfdata *, void *));
static void apm_event_handle __P((struct apm_softc *, u_int, u_int));
static void apm_periodic_check __P((struct apm_softc *));
static void apm_create_thread __P((void *));
static void apm_thread __P((void *));
static void apm_perror __P((const char *, int, ...))
__kprintf_attribute__((__format__(__printf__,1,3)));
#ifdef APM_POWER_PRINT
static void apm_power_print __P((struct apm_softc *, struct apm_power_info *));
#endif
static int apm_record_event __P((struct apm_softc *, u_int));
static void apm_set_ver __P((struct apm_softc *, u_long));
static void apm_standby __P((struct apm_softc *));
static const char *apm_strerror __P((int));
static void apm_suspend __P((struct apm_softc *));
static void apm_resume __P((struct apm_softc *, u_int, u_int));
cdev_decl(apm);
struct cfattach apm_ca = {
sizeof(struct apm_softc), apmmatch, apmattach
};
extern struct cfdriver apm_cd;
/* configurable variables */
int apm_bogus_bios = 0;
#ifdef APM_DISABLE
int apm_enabled = 0;
#else
int apm_enabled = 1;
#endif
#ifdef APM_NO_IDLE
int apm_do_idle = 0;
#else
int apm_do_idle = 1;
#endif
#ifdef APM_NO_STANDBY
int apm_do_standby = 0;
#else
int apm_do_standby = 1;
#endif
#ifdef APM_V10_ONLY
int apm_v11_enabled = 0;
#else
int apm_v11_enabled = 1;
#endif
#ifdef APM_NO_V12
int apm_v12_enabled = 0;
#else
int apm_v12_enabled = 1;
#endif
/* variables used during operation (XXX cgd) */
u_char apm_majver, apm_minver;
int apm_inited;
int apm_standbys, apm_userstandbys, apm_suspends, apm_battlow;
int apm_damn_fool_bios, apm_op_inprog;
int apm_evindex;
static const char *
apm_strerror(code)
int code;
{
switch (code) {
case APM_ERR_PM_DISABLED:
return ("power management disabled");
case APM_ERR_REALALREADY:
return ("real mode interface already connected");
case APM_ERR_NOTCONN:
return ("interface not connected");
case APM_ERR_16ALREADY:
return ("16-bit interface already connected");
case APM_ERR_16NOTSUPP:
return ("16-bit interface not supported");
case APM_ERR_32ALREADY:
return ("32-bit interface already connected");
case APM_ERR_32NOTSUPP:
return ("32-bit interface not supported");
case APM_ERR_UNRECOG_DEV:
return ("unrecognized device ID");
case APM_ERR_ERANGE:
return ("parameter out of range");
case APM_ERR_NOTENGAGED:
return ("interface not engaged");
case APM_ERR_UNABLE:
return ("unable to enter requested state");
case APM_ERR_NOEVENTS:
return ("no pending events");
case APM_ERR_NOT_PRESENT:
return ("no APM present");
default:
return ("unknown error code");
}
}
static void
apm_perror(const char *str, int errinfo, ...) /* XXX cgd */
{
va_list ap;
printf("APM ");
va_start(ap, errinfo);
vprintf(str, ap); /* XXX cgd */
va_end(ap);
printf(": %s\n", apm_strerror(errinfo));
}
#ifdef APM_POWER_PRINT
static void
apm_power_print(sc, pi)
struct apm_softc *sc;
struct apm_power_info *pi;
{
if (APM_BATT_LIFE(regs) != APM_BATT_LIFE_UNKNOWN) {
printf("%s: battery life expectancy: %d%%\n",
sc->sc_dev.dv_xname, APM_BATT_LIFE(regs));
}
printf("%s: A/C state: ", sc->sc_dev.dv_xname);
switch (pi->ac_state) {
case APM_AC_OFF:
printf("off\n");
break;
case APM_AC_ON:
printf("on\n");
break;
case APM_AC_BACKUP:
printf("backup power\n");
break;
default:
case APM_AC_UNKNOWN:
printf("unknown\n");
break;
}
printf("%s: battery charge state:", sc->sc_dev.dv_xname);
switch (pi->battery_state) {
case APM_BATT_HIGH:
printf("high\n");
break;
case APM_BATT_LOW:
printf("low\n");
break;
case APM_BATT_CRITICAL:
printf("critical\n");
break;
case APM_BATT_CHARGING:
printf("charging\n");
break;
case APM_BATT_UNKNOWN:
printf("unknown\n");
break;
default:
printf("undecoded state %x\n", pi->battery_state);
break;
}
if (pi->minutes_left != 0) {
printf("%s: estimated ", sc->sc_dev.dv_xname);
printf("%dh ", pi->minutes_left / 60);
}
return;
}
#endif
static void
apm_suspend(sc)
struct apm_softc *sc;
{
if (sc->sc_power_state == PWR_SUSPEND) {
#ifdef APMDEBUG
printf("%s: apm_suspend: already suspended?\n",
sc->sc_dev.dv_xname);
#endif
return;
}
sc->sc_power_state = PWR_SUSPEND;
dopowerhooks(PWR_SUSPEND);
/* XXX cgd */
(void)sc->ops->set_powstate(sc->cookie, APM_DEV_ALLDEVS, APM_SYS_SUSPEND);
}
static void
apm_standby(sc)
struct apm_softc *sc;
{
if (sc->sc_power_state == PWR_STANDBY) {
#ifdef APMDEBUG
printf("%s: apm_standby: already standing by?\n",
sc->sc_dev.dv_xname);
#endif
return;
}
sc->sc_power_state = PWR_STANDBY;
dopowerhooks(PWR_STANDBY);
/* XXX cgd */
(void)sc->ops->set_powstate(sc->cookie, APM_DEV_ALLDEVS, APM_SYS_STANDBY);
}
static void
apm_resume(sc, event_type, event_info)
struct apm_softc *sc;
u_int event_type, event_info;
{
if (sc->sc_power_state == PWR_RESUME) {
#ifdef APMDEBUG
printf("%s: apm_resume: already running?\n",
sc->sc_dev.dv_xname);
#endif
return;
}
sc->sc_power_state = PWR_RESUME;
/*
* Some system requires its clock to be initialized after hybernation.
*/
/* XXX
initrtclock();
*/
inittodr(time.tv_sec);
dopowerhooks(PWR_RESUME);
apm_record_event(sc, event_type);
}
/*
* return 0 if the user will notice and handle the event,
* return 1 if the kernel driver should do so.
*/
static int
apm_record_event(sc, event_type)
struct apm_softc *sc;
u_int event_type;
{
struct apm_event_info *evp;
if ((sc->sc_flags & SCFLAG_OPEN) == 0)
return 1; /* no user waiting */
if (sc->event_count == APM_NEVENTS)
return 1; /* overflow */
evp = &sc->event_list[sc->event_ptr];
sc->event_count++;
sc->event_ptr++;
sc->event_ptr %= APM_NEVENTS;
evp->type = event_type;
evp->index = ++apm_evindex;
selwakeup(&sc->sc_rsel);
return (sc->sc_flags & SCFLAG_OWRITE) ? 0 : 1; /* user may handle */
}
static void
apm_event_handle(sc, event_code, event_info)
struct apm_softc *sc;
u_int event_code, event_info;
{
int error;
char *code;
struct apm_power_info pi;
switch (event_code) {
case APM_USER_STANDBY_REQ:
DPRINTF(APMDEBUG_EVENTS, ("apmev: user standby request\n"));
if (apm_do_standby) {
if (apm_record_event(sc, event_code))
apm_userstandbys++;
apm_op_inprog++;
(void)sc->ops->set_powstate(sc->cookie,
APM_DEV_ALLDEVS,
APM_LASTREQ_INPROG);
} else {
(void)sc->ops->set_powstate(sc->cookie,
APM_DEV_ALLDEVS,
APM_LASTREQ_REJECTED);
/* in case BIOS hates being spurned */
sc->ops->enable(sc->cookie, 1);
}
break;
case APM_STANDBY_REQ:
DPRINTF(APMDEBUG_EVENTS, ("apmev: system standby request\n"));
if (apm_standbys || apm_suspends) {
DPRINTF(APMDEBUG_EVENTS | APMDEBUG_ANOM,
("damn fool BIOS did not wait for answer\n"));
/* just give up the fight */
apm_damn_fool_bios = 1;
}
if (apm_do_standby) {
if (apm_record_event(sc, event_code))
apm_standbys++;
apm_op_inprog++;
(void)sc->ops->set_powstate(sc->cookie,
APM_DEV_ALLDEVS,
APM_LASTREQ_INPROG);
} else {
(void)sc->ops->set_powstate(sc->cookie,
APM_DEV_ALLDEVS,
APM_LASTREQ_REJECTED);
/* in case BIOS hates being spurned */
sc->ops->enable(sc->cookie, 1);
}
break;
case APM_USER_SUSPEND_REQ:
DPRINTF(APMDEBUG_EVENTS, ("apmev: user suspend request\n"));
if (apm_record_event(sc, event_code))
apm_suspends++;
apm_op_inprog++;
(void)sc->ops->set_powstate(sc->cookie,
APM_DEV_ALLDEVS,
APM_LASTREQ_INPROG);
break;
case APM_SUSPEND_REQ:
DPRINTF(APMDEBUG_EVENTS, ("apmev: system suspend request\n"));
if (apm_standbys || apm_suspends) {
DPRINTF(APMDEBUG_EVENTS | APMDEBUG_ANOM,
("damn fool BIOS did not wait for answer\n"));
/* just give up the fight */
apm_damn_fool_bios = 1;
}
if (apm_record_event(sc, event_code))
apm_suspends++;
apm_op_inprog++;
(void)sc->ops->set_powstate(sc->cookie,
APM_DEV_ALLDEVS,
APM_LASTREQ_INPROG);
break;
case APM_POWER_CHANGE:
DPRINTF(APMDEBUG_EVENTS, ("apmev: power status change\n"));
error = sc->ops->get_powstat(sc->cookie, &pi);
#ifdef APM_POWER_PRINT
/* only print if nobody is catching events. */
if (error == 0 &&
(sc->sc_flags & (SCFLAG_OREAD|SCFLAG_OWRITE)) == 0)
apm_power_print(sc, &pi);
#endif
apm_record_event(sc, event_code);
break;
case APM_NORMAL_RESUME:
DPRINTF(APMDEBUG_EVENTS, ("apmev: resume system\n"));
apm_resume(sc, event_code, event_info);
break;
case APM_CRIT_RESUME:
DPRINTF(APMDEBUG_EVENTS, ("apmev: critical resume system"));
apm_resume(sc, event_code, event_info);
break;
case APM_SYS_STANDBY_RESUME:
DPRINTF(APMDEBUG_EVENTS, ("apmev: system standby resume\n"));
apm_resume(sc, event_code, event_info);
break;
case APM_UPDATE_TIME:
DPRINTF(APMDEBUG_EVENTS, ("apmev: update time\n"));
apm_resume(sc, event_code, event_info);
break;
case APM_CRIT_SUSPEND_REQ:
DPRINTF(APMDEBUG_EVENTS, ("apmev: critical system suspend\n"));
apm_record_event(sc, event_code);
apm_suspend(sc);
break;
case APM_BATTERY_LOW:
DPRINTF(APMDEBUG_EVENTS, ("apmev: battery low\n"));
apm_battlow++;
apm_record_event(sc, event_code);
break;
case APM_CAP_CHANGE:
DPRINTF(APMDEBUG_EVENTS, ("apmev: capability change\n"));
if (apm_minver < 2) {
DPRINTF(APMDEBUG_EVENTS, ("apm: unexpected event\n"));
} else {
u_int numbatts, capflags;
sc->ops->get_capabilities(sc->cookie,
&numbatts, &capflags);
sc->ops->get_powstat(sc->cookie, &pi); /* XXX */
}
break;
default:
switch (event_code >> 8) {
case 0:
code = "reserved system";
break;
case 1:
code = "reserved device";
break;
case 2:
code = "OEM defined";
break;
default:
code = "reserved";
break;
}
printf("APM: %s event code %x\n", code, event_code);
}
}
static void
apm_periodic_check(sc)
struct apm_softc *sc;
{
int error;
u_int event_code, event_info;
/*
* tell the BIOS we're working on it, if asked to do a
* suspend/standby
*/
if (apm_op_inprog)
sc->ops->set_powstate(sc->cookie, APM_DEV_ALLDEVS,
APM_LASTREQ_INPROG);
while ((error = sc->ops->get_event(sc->cookie, &event_code,
&event_info)) == 0
&& !apm_damn_fool_bios)
apm_event_handle(sc, event_code, event_info);
if (error != APM_ERR_NOEVENTS)
apm_perror("get event", error);
if (apm_suspends) {
apm_op_inprog = 0;
apm_suspend(sc);
} else if (apm_standbys || apm_userstandbys) {
apm_op_inprog = 0;
apm_standby(sc);
}
apm_suspends = apm_standbys = apm_battlow = apm_userstandbys = 0;
apm_damn_fool_bios = 0;
}
static void
apm_set_ver(self, detail)
struct apm_softc *self;
u_long detail;
{
if (apm_v12_enabled &&
APM_MAJOR_VERS(detail) == 1 &&
APM_MINOR_VERS(detail) == 2) {
apm_majver = 1;
apm_minver = 2;
goto ok;
}
if (apm_v11_enabled &&
APM_MAJOR_VERS(detail) == 1 &&
APM_MINOR_VERS(detail) == 1) {
apm_majver = 1;
apm_minver = 1;
} else {
apm_majver = 1;
apm_minver = 0;
}
ok:
printf("Power Management spec V%d.%d", apm_majver, apm_minver);
apm_inited = 1;
if (detail & APM_IDLE_SLOWS) {
#ifdef DIAGNOSTIC
/* not relevant often */
printf(" (slowidle)");
#endif
/* leave apm_do_idle at its user-configured setting */
} else
apm_do_idle = 0;
#ifdef DIAGNOSTIC
if (detail & APM_BIOS_PM_DISABLED)
printf(" (BIOS mgmt disabled)");
if (detail & APM_BIOS_PM_DISENGAGED)
printf(" (BIOS managing devices)");
#endif
}
static int
apmmatch(parent, match, aux)
struct device *parent;
struct cfdata *match;
void *aux;
{
/* There can be only one! */
if (apm_inited)
return 0;
return (1);
}
static void
apmattach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct apm_softc *sc = (void *)self;
struct apmdev_attach_args *aaa = aux;
struct apm_power_info pinfo;
u_int numbatts, capflags;
int error;
printf(": ");
sc->ops = aaa->accessops;
sc->cookie = aaa->accesscookie;
switch ((APM_MAJOR_VERS(aaa->apm_detail) << 8) +
APM_MINOR_VERS(aaa->apm_detail)) {
case 0x0100:
apm_v11_enabled = 0;
apm_v12_enabled = 0;
break;
case 0x0101:
apm_v12_enabled = 0;
/* fall through */
case 0x0102:
default:
break;
}
apm_set_ver(sc, aaa->apm_detail); /* prints version info */
printf("\n");
if (apm_minver >= 2)
sc->ops->get_capabilities(sc->cookie, &numbatts, &capflags);
/*
* enable power management
*/
sc->ops->enable(sc->cookie, 1);
error = sc->ops->get_powstat(sc->cookie, &pinfo);
if (error == 0) {
#ifdef APM_POWER_PRINT
apm_power_print(apmsc, &pinfo);
#endif
} else
apm_perror("get power status", error);
sc->ops->cpu_busy(sc->cookie);
lockinit(&sc->sc_lock, PWAIT, "apmlk", 0, 0);
/* Initial state is `resumed'. */
sc->sc_power_state = PWR_RESUME;
/* Do an initial check. */
apm_periodic_check(sc);
/*
* Create a kernel thread to periodically check for APM events,
* and notify other subsystems when they occur.
*/
kthread_create(apm_create_thread, sc);
return;
}
/*
* Print function (for parent devices).
*/
int
apmprint(aux, pnp)
void *aux;
const char *pnp;
{
if (pnp)
printf("apm at %s", pnp);
return (UNCONF);
}
void
apm_create_thread(arg)
void *arg;
{
struct apm_softc *sc = arg;
if (kthread_create1(apm_thread, sc, &sc->sc_thread,
"%s", sc->sc_dev.dv_xname) == 0)
return;
/*
* We were unable to create the APM thread; bail out.
*/
sc->ops->disconnect(sc->cookie);
printf("%s: unable to create thread, kernel APM support disabled\n",
sc->sc_dev.dv_xname);
}
void
apm_thread(arg)
void *arg;
{
struct apm_softc *apmsc = arg;
/*
* Loop forever, doing a periodic check for APM events.
*/
for (;;) {
APM_LOCK(apmsc);
apm_periodic_check(apmsc);
APM_UNLOCK(apmsc);
(void) tsleep(apmsc, PWAIT, "apmev", (8 * hz) / 7);
}
}
int
apmopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
int unit = APMUNIT(dev);
int ctl = APMDEV(dev);
int error = 0;
struct apm_softc *sc;
if (unit >= apm_cd.cd_ndevs)
return ENXIO;
sc = apm_cd.cd_devs[unit];
if (!sc)
return ENXIO;
if (!apm_inited)
return ENXIO;
DPRINTF(APMDEBUG_DEVICE,
("apmopen: pid %d flag %x mode %x\n", p->p_pid, flag, mode));
APM_LOCK(sc);
switch (ctl) {
case APMDEV_CTL:
if (!(flag & FWRITE)) {
error = EINVAL;
break;
}
if (sc->sc_flags & SCFLAG_OWRITE) {
error = EBUSY;
break;
}
sc->sc_flags |= SCFLAG_OWRITE;
break;
case APMDEV_NORMAL:
if (!(flag & FREAD) || (flag & FWRITE)) {
error = EINVAL;
break;
}
sc->sc_flags |= SCFLAG_OREAD;
break;
default:
error = ENXIO;
break;
}
APM_UNLOCK(sc);
return (error);
}
int
apmclose(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
struct apm_softc *sc = apm_cd.cd_devs[APMUNIT(dev)];
int ctl = APMDEV(dev);
DPRINTF(APMDEBUG_DEVICE,
("apmclose: pid %d flag %x mode %x\n", p->p_pid, flag, mode));
APM_LOCK(sc);
switch (ctl) {
case APMDEV_CTL:
sc->sc_flags &= ~SCFLAG_OWRITE;
break;
case APMDEV_NORMAL:
sc->sc_flags &= ~SCFLAG_OREAD;
break;
}
if ((sc->sc_flags & SCFLAG_OPEN) == 0) {
sc->event_count = 0;
sc->event_ptr = 0;
}
APM_UNLOCK(sc);
return 0;
}
int
apmioctl(dev, cmd, data, flag, p)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
struct apm_softc *sc = apm_cd.cd_devs[APMUNIT(dev)];
struct apm_power_info *powerp;
struct apm_event_info *evp;
#if 0
struct apm_ctl *actl;
#endif
int i, error = 0;
APM_LOCK(sc);
switch (cmd) {
case APM_IOC_STANDBY:
if (!apm_do_standby) {
error = EOPNOTSUPP;
break;
}
if ((flag & FWRITE) == 0) {
error = EBADF;
break;
}
apm_userstandbys++;
break;
case APM_IOC_SUSPEND:
if ((flag & FWRITE) == 0) {
error = EBADF;
break;
}
apm_suspends++;
break;
case APM_IOC_NEXTEVENT:
if (!sc->event_count)
error = EAGAIN;
else {
evp = (struct apm_event_info *)data;
i = sc->event_ptr + APM_NEVENTS - sc->event_count;
i %= APM_NEVENTS;
*evp = sc->event_list[i];
sc->event_count--;
}
break;
case APM_IOC_GETPOWER:
powerp = (struct apm_power_info *)data;
if ((error = sc->ops->get_powstat(sc->cookie, powerp)) != 0) {
apm_perror("ioctl get power status", error);
error = EIO;
}
break;
default:
error = ENOTTY;
}
APM_UNLOCK(sc);
return (error);
}
int
apmpoll(dev, events, p)
dev_t dev;
int events;
struct proc *p;
{
struct apm_softc *sc = apm_cd.cd_devs[APMUNIT(dev)];
int revents = 0;
APM_LOCK(sc);
if (events & (POLLIN | POLLRDNORM)) {
if (sc->event_count)
revents |= events & (POLLIN | POLLRDNORM);
else
selrecord(p, &sc->sc_rsel);
}
APM_UNLOCK(sc);
return (revents);
}
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