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freebsd-dev/sys/i386/bios/apm.c
Ed Schouten 6bfa9a2d66 Replace all calls to minor() with dev2unit(). 
After I removed all the unit2minor()/minor2unit() calls from the kernel
yesterday, I realised calling minor() everywhere is quite confusing.
Character devices now only have the ability to store a unit number, not
a minor number. Remove the confusion by using dev2unit() everywhere.

This commit could also be considered as a bug fix. A lot of drivers call
minor(), while they should actually be calling dev2unit(). In -CURRENT
this isn't a problem, but it turns out we never had any problem reports
related to that issue in the past. I suspect not many people connect
more than 256 pieces of the same hardware.

Reviewed by:	kib
2008-09-27 08:51:18 +00:00

1575 lines
35 KiB
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/*-
* APM (Advanced Power Management) BIOS Device Driver
*
* Copyright (c) 1994 UKAI, Fumitoshi.
* Copyright (c) 1994-1995 by HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
* Copyright (c) 1996 Nate Williams <nate@FreeBSD.org>
* Copyright (c) 1997 Poul-Henning Kamp <phk@FreeBSD.org>
*
* This software may be used, modified, copied, and distributed, in
* both source and binary form provided that the above copyright and
* these terms are retained. Under no circumstances is the author
* responsible for the proper functioning of this software, nor does
* the author assume any responsibility for damages incurred with its
* use.
*
* Sep, 1994 Implemented on FreeBSD 1.1.5.1R (Toshiba AVS001WD)
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/condvar.h>
#include <sys/eventhandler.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/poll.h>
#include <sys/power.h>
#include <sys/reboot.h>
#include <sys/selinfo.h>
#include <sys/signalvar.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <machine/apm_bios.h>
#include <machine/clock.h>
#include <machine/endian.h>
#include <machine/pc/bios.h>
#include <machine/cpufunc.h>
#include <machine/segments.h>
#include <machine/stdarg.h>
#include <machine/vm86.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_param.h>
#include <i386/bios/apm.h>
/* Used by the apm_saver screen saver module */
int apm_display(int newstate);
struct apm_softc apm_softc;
static void apm_resume(void);
static int apm_bioscall(void);
static int apm_check_function_supported(u_int version, u_int func);
static int apm_pm_func(u_long, void*, ...);
static u_long apm_version;
int apm_evindex;
#define SCFLAG_ONORMAL 0x0000001
#define SCFLAG_OCTL 0x0000002
#define SCFLAG_OPEN (SCFLAG_ONORMAL|SCFLAG_OCTL)
#define APMDEV(dev) (dev2unit(dev)&0x0f)
#define APMDEV_NORMAL 0
#define APMDEV_CTL 8
#ifdef PC98
extern int bios32_apm98(struct bios_regs *, u_int, u_short);
/* PC98's SMM definition */
#define APM_NECSMM_PORT 0x6b8e
#define APM_NECSMM_PORTSZ 1
#define APM_NECSMM_EN 0x10
static __inline void apm_enable_smm(struct apm_softc *);
static __inline void apm_disable_smm(struct apm_softc *);
int apm_necsmm_addr;
u_int32_t apm_necsmm_mask;
#endif
static struct apmhook *hook[NAPM_HOOK]; /* XXX */
#define is_enabled(foo) ((foo) ? "enabled" : "disabled")
/* Map version number to integer (keeps ordering of version numbers) */
#define INTVERSION(major, minor) ((major)*100 + (minor))
static d_open_t apmopen;
static d_close_t apmclose;
static d_write_t apmwrite;
static d_ioctl_t apmioctl;
static d_poll_t apmpoll;
static struct cdevsw apm_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = apmopen,
.d_close = apmclose,
.d_write = apmwrite,
.d_ioctl = apmioctl,
.d_poll = apmpoll,
.d_name = "apm",
};
static int apm_suspend_delay = 1;
static int apm_standby_delay = 1;
static int apm_swab_batt_minutes = 0;
static int apm_debug = 0;
#define APM_DPRINT(args...) do { \
if (apm_debug) { \
printf(args); \
} \
} while (0)
SYSCTL_INT(_machdep, OID_AUTO, apm_suspend_delay, CTLFLAG_RW, &apm_suspend_delay, 1, "");
SYSCTL_INT(_machdep, OID_AUTO, apm_standby_delay, CTLFLAG_RW, &apm_standby_delay, 1, "");
SYSCTL_INT(_debug, OID_AUTO, apm_debug, CTLFLAG_RW, &apm_debug, 0, "");
TUNABLE_INT("machdep.apm_swab_batt_minutes", &apm_swab_batt_minutes);
SYSCTL_INT(_machdep, OID_AUTO, apm_swab_batt_minutes, CTLFLAG_RW,
&apm_swab_batt_minutes, 0, "Byte swap battery time value.");
#ifdef PC98
static __inline void
apm_enable_smm(sc)
struct apm_softc *sc;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
if (apm_necsmm_addr != 0)
bus_space_write_1(iot, ioh, 0,
(bus_space_read_1(iot, ioh, 0) | ~apm_necsmm_mask));
}
static __inline void
apm_disable_smm(sc)
struct apm_softc *sc;
{
bus_space_tag_t iot = sc->sc_iot;
bus_space_handle_t ioh = sc->sc_ioh;
if (apm_necsmm_addr != 0)
bus_space_write_1(iot, ioh, 0,
(bus_space_read_1(iot, ioh, 0) & apm_necsmm_mask));
}
#endif
/*
* return 0 if the function successfull,
* return 1 if the function unsuccessfull,
* return -1 if the function unsupported.
*/
static int
apm_bioscall(void)
{
struct apm_softc *sc = &apm_softc;
int errno = 0;
u_int apm_func = sc->bios.r.eax & 0xff;
if (!apm_check_function_supported(sc->intversion, apm_func)) {
APM_DPRINT("apm_bioscall: function 0x%x is not supported in v%d.%d\n",
apm_func, sc->majorversion, sc->minorversion);
return (-1);
}
sc->bios_busy = 1;
#ifdef PC98
set_bios_selectors(&sc->bios.seg, BIOSCODE_FLAG | BIOSDATA_FLAG);
if (bios32_apm98(&sc->bios.r, sc->bios.entry,
GSEL(GBIOSCODE32_SEL, SEL_KPL)) != 0)
return 1;
#else
if (sc->connectmode == APM_PROT32CONNECT) {
set_bios_selectors(&sc->bios.seg,
BIOSCODE_FLAG | BIOSDATA_FLAG);
errno = bios32(&sc->bios.r,
sc->bios.entry, GSEL(GBIOSCODE32_SEL, SEL_KPL));
} else {
errno = bios16(&sc->bios, NULL);
}
#endif
sc->bios_busy = 0;
return (errno);
}
/* check whether APM function is supported (1) or not (0). */
static int
apm_check_function_supported(u_int version, u_int func)
{
/* except driver version */
if (func == APM_DRVVERSION) {
return (1);
}
#ifdef PC98
if (func == APM_GETPWSTATUS) {
return (1);
}
#endif
switch (version) {
case INTVERSION(1, 0):
if (func > APM_GETPMEVENT) {
return (0); /* not supported */
}
break;
case INTVERSION(1, 1):
if (func > APM_ENGAGEDISENGAGEPM &&
func < APM_OEMFUNC) {
return (0); /* not supported */
}
break;
case INTVERSION(1, 2):
break;
}
return (1); /* supported */
}
/* enable/disable power management */
static int
apm_enable_disable_pm(int enable)
{
struct apm_softc *sc = &apm_softc;
sc->bios.r.eax = (APM_BIOS << 8) | APM_ENABLEDISABLEPM;
if (sc->intversion >= INTVERSION(1, 1))
sc->bios.r.ebx = PMDV_ALLDEV;
else
sc->bios.r.ebx = 0xffff; /* APM version 1.0 only */
sc->bios.r.ecx = enable;
sc->bios.r.edx = 0;
return (apm_bioscall());
}
/* register driver version (APM 1.1 or later) */
static int
apm_driver_version(int version)
{
struct apm_softc *sc = &apm_softc;
sc->bios.r.eax = (APM_BIOS << 8) | APM_DRVVERSION;
sc->bios.r.ebx = 0x0;
sc->bios.r.ecx = version;
sc->bios.r.edx = 0;
if (apm_bioscall() == 0 && sc->bios.r.eax == version)
return (0);
/* Some old BIOSes don't return the connection version in %ax. */
if (sc->bios.r.eax == ((APM_BIOS << 8) | APM_DRVVERSION))
return (0);
return (1);
}
/* engage/disengage power management (APM 1.1 or later) */
static int
apm_engage_disengage_pm(int engage)
{
struct apm_softc *sc = &apm_softc;
sc->bios.r.eax = (APM_BIOS << 8) | APM_ENGAGEDISENGAGEPM;
sc->bios.r.ebx = PMDV_ALLDEV;
sc->bios.r.ecx = engage;
sc->bios.r.edx = 0;
return (apm_bioscall());
}
/* get PM event */
static u_int
apm_getevent(void)
{
struct apm_softc *sc = &apm_softc;
sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPMEVENT;
sc->bios.r.ebx = 0;
sc->bios.r.ecx = 0;
sc->bios.r.edx = 0;
if (apm_bioscall())
return (PMEV_NOEVENT);
return (sc->bios.r.ebx & 0xffff);
}
/* suspend entire system */
static int
apm_suspend_system(int state)
{
struct apm_softc *sc = &apm_softc;
sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
sc->bios.r.ebx = PMDV_ALLDEV;
sc->bios.r.ecx = state;
sc->bios.r.edx = 0;
#ifdef PC98
apm_disable_smm(sc);
#endif
if (apm_bioscall()) {
printf("Entire system suspend failure: errcode = %d\n",
0xff & (sc->bios.r.eax >> 8));
return 1;
}
#ifdef PC98
apm_enable_smm(sc);
#endif
return 0;
}
/* Display control */
/*
* Experimental implementation: My laptop machine can't handle this function
* If your laptop can control the display via APM, please inform me.
* HOSOKAWA, Tatsumi <hosokawa@jp.FreeBSD.org>
*/
int
apm_display(int newstate)
{
struct apm_softc *sc = &apm_softc;
sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
sc->bios.r.ebx = PMDV_DISP0;
sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
sc->bios.r.edx = 0;
if (apm_bioscall() == 0) {
return 0;
}
/* If failed, then try to blank all display devices instead. */
sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
sc->bios.r.ebx = PMDV_DISPALL; /* all display devices */
sc->bios.r.ecx = newstate ? PMST_APMENABLED:PMST_SUSPEND;
sc->bios.r.edx = 0;
if (apm_bioscall() == 0) {
return 0;
}
printf("Display off failure: errcode = %d\n",
0xff & (sc->bios.r.eax >> 8));
return 1;
}
/*
* Turn off the entire system.
*/
static void
apm_power_off(void *junk, int howto)
{
struct apm_softc *sc = &apm_softc;
/* Not halting powering off, or not active */
if (!(howto & RB_POWEROFF) || !apm_softc.active)
return;
sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
sc->bios.r.ebx = PMDV_ALLDEV;
sc->bios.r.ecx = PMST_OFF;
sc->bios.r.edx = 0;
(void) apm_bioscall();
}
/* APM Battery low handler */
static void
apm_battery_low(void)
{
printf("\007\007 * * * BATTERY IS LOW * * * \007\007");
}
/* APM hook manager */
static struct apmhook *
apm_add_hook(struct apmhook **list, struct apmhook *ah)
{
int s;
struct apmhook *p, *prev;
APM_DPRINT("Add hook \"%s\"\n", ah->ah_name);
s = splhigh();
if (ah == NULL)
panic("illegal apm_hook!");
prev = NULL;
for (p = *list; p != NULL; prev = p, p = p->ah_next)
if (p->ah_order > ah->ah_order)
break;
if (prev == NULL) {
ah->ah_next = *list;
*list = ah;
} else {
ah->ah_next = prev->ah_next;
prev->ah_next = ah;
}
splx(s);
return ah;
}
static void
apm_del_hook(struct apmhook **list, struct apmhook *ah)
{
int s;
struct apmhook *p, *prev;
s = splhigh();
prev = NULL;
for (p = *list; p != NULL; prev = p, p = p->ah_next)
if (p == ah)
goto deleteit;
panic("Tried to delete unregistered apm_hook.");
goto nosuchnode;
deleteit:
if (prev != NULL)
prev->ah_next = p->ah_next;
else
*list = p->ah_next;
nosuchnode:
splx(s);
}
/* APM driver calls some functions automatically */
static void
apm_execute_hook(struct apmhook *list)
{
struct apmhook *p;
for (p = list; p != NULL; p = p->ah_next) {
APM_DPRINT("Execute APM hook \"%s.\"\n", p->ah_name);
if ((*(p->ah_fun))(p->ah_arg))
printf("Warning: APM hook \"%s\" failed", p->ah_name);
}
}
/* establish an apm hook */
struct apmhook *
apm_hook_establish(int apmh, struct apmhook *ah)
{
if (apmh < 0 || apmh >= NAPM_HOOK)
return NULL;
return apm_add_hook(&hook[apmh], ah);
}
/* disestablish an apm hook */
void
apm_hook_disestablish(int apmh, struct apmhook *ah)
{
if (apmh < 0 || apmh >= NAPM_HOOK)
return;
apm_del_hook(&hook[apmh], ah);
}
static int apm_record_event(struct apm_softc *, u_int);
static void apm_processevent(void);
static u_int apm_op_inprog = 0;
static void
apm_do_suspend(void)
{
struct apm_softc *sc = &apm_softc;
int error;
if (sc == NULL || sc->initialized == 0)
return;
apm_op_inprog = 0;
sc->suspends = sc->suspend_countdown = 0;
/*
* Be sure to hold Giant across DEVICE_SUSPEND/RESUME since
* non-MPSAFE drivers need this.
*/
mtx_lock(&Giant);
error = DEVICE_SUSPEND(root_bus);
if (error) {
mtx_unlock(&Giant);
return;
}
apm_execute_hook(hook[APM_HOOK_SUSPEND]);
if (apm_suspend_system(PMST_SUSPEND) == 0) {
sc->suspending = 1;
apm_processevent();
} else {
/* Failure, 'resume' the system again */
apm_execute_hook(hook[APM_HOOK_RESUME]);
DEVICE_RESUME(root_bus);
}
mtx_unlock(&Giant);
return;
}
static void
apm_do_standby(void)
{
struct apm_softc *sc = &apm_softc;
if (sc == NULL || sc->initialized == 0)
return;
apm_op_inprog = 0;
sc->standbys = sc->standby_countdown = 0;
/*
* As far as standby, we don't need to execute
* all of suspend hooks.
*/
if (apm_suspend_system(PMST_STANDBY) == 0)
apm_processevent();
return;
}
static void
apm_lastreq_notify(void)
{
struct apm_softc *sc = &apm_softc;
sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
sc->bios.r.ebx = PMDV_ALLDEV;
sc->bios.r.ecx = PMST_LASTREQNOTIFY;
sc->bios.r.edx = 0;
apm_bioscall();
}
static int
apm_lastreq_rejected(void)
{
struct apm_softc *sc = &apm_softc;
if (apm_op_inprog == 0) {
return 1; /* no operation in progress */
}
sc->bios.r.eax = (APM_BIOS << 8) | APM_SETPWSTATE;
sc->bios.r.ebx = PMDV_ALLDEV;
sc->bios.r.ecx = PMST_LASTREQREJECT;
sc->bios.r.edx = 0;
if (apm_bioscall()) {
APM_DPRINT("apm_lastreq_rejected: failed\n");
return 1;
}
apm_op_inprog = 0;
return 0;
}
/*
* Public interface to the suspend/resume:
*
* Execute suspend and resume hook before and after sleep, respectively.
*
*/
void
apm_suspend(int state)
{
struct apm_softc *sc = &apm_softc;
if (sc == NULL || sc->initialized == 0)
return;
switch (state) {
case PMST_SUSPEND:
if (sc->suspends)
return;
sc->suspends++;
sc->suspend_countdown = apm_suspend_delay;
break;
case PMST_STANDBY:
if (sc->standbys)
return;
sc->standbys++;
sc->standby_countdown = apm_standby_delay;
break;
default:
printf("apm_suspend: Unknown Suspend state 0x%x\n", state);
return;
}
apm_op_inprog++;
apm_lastreq_notify();
}
static void
apm_resume(void)
{
struct apm_softc *sc = &apm_softc;
if (sc == NULL || sc->initialized == 0 || sc->suspending == 0)
return;
sc->suspending = 0;
apm_execute_hook(hook[APM_HOOK_RESUME]);
mtx_lock(&Giant);
DEVICE_RESUME(root_bus);
mtx_unlock(&Giant);
return;
}
/* get power status per battery */
static int
apm_get_pwstatus(apm_pwstatus_t app)
{
struct apm_softc *sc = &apm_softc;
if (app->ap_device != PMDV_ALLDEV &&
(app->ap_device < PMDV_BATT0 || app->ap_device > PMDV_BATT_ALL))
return 1;
sc->bios.r.eax = (APM_BIOS << 8) | APM_GETPWSTATUS;
sc->bios.r.ebx = app->ap_device;
sc->bios.r.ecx = 0;
sc->bios.r.edx = 0xffff; /* default to unknown battery time */
if (apm_bioscall())
return 1;
app->ap_acline = (sc->bios.r.ebx >> 8) & 0xff;
app->ap_batt_stat = sc->bios.r.ebx & 0xff;
app->ap_batt_flag = (sc->bios.r.ecx >> 8) & 0xff;
app->ap_batt_life = sc->bios.r.ecx & 0xff;
sc->bios.r.edx &= 0xffff;
if (apm_swab_batt_minutes)
sc->bios.r.edx = __bswap16(sc->bios.r.edx) | 0x8000;
if (sc->bios.r.edx == 0xffff) /* Time is unknown */
app->ap_batt_time = -1;
else if (sc->bios.r.edx & 0x8000) /* Time is in minutes */
app->ap_batt_time = (sc->bios.r.edx & 0x7fff) * 60;
else /* Time is in seconds */
app->ap_batt_time = sc->bios.r.edx;
return 0;
}
/* get APM information */
static int
apm_get_info(apm_info_t aip)
{
struct apm_softc *sc = &apm_softc;
struct apm_pwstatus aps;
bzero(&aps, sizeof(aps));
aps.ap_device = PMDV_ALLDEV;
if (apm_get_pwstatus(&aps))
return 1;
aip->ai_infoversion = 1;
aip->ai_acline = aps.ap_acline;
aip->ai_batt_stat = aps.ap_batt_stat;
aip->ai_batt_life = aps.ap_batt_life;
aip->ai_batt_time = aps.ap_batt_time;
aip->ai_major = (u_int)sc->majorversion;
aip->ai_minor = (u_int)sc->minorversion;
aip->ai_status = (u_int)sc->active;
sc->bios.r.eax = (APM_BIOS << 8) | APM_GETCAPABILITIES;
sc->bios.r.ebx = 0;
sc->bios.r.ecx = 0;
sc->bios.r.edx = 0;
if (apm_bioscall()) {
aip->ai_batteries = 0xffffffff; /* Unknown */
aip->ai_capabilities = 0xff00; /* Unknown, with no bits set */
} else {
aip->ai_batteries = sc->bios.r.ebx & 0xff;
aip->ai_capabilities = sc->bios.r.ecx & 0xff;
}
bzero(aip->ai_spare, sizeof aip->ai_spare);
return 0;
}
/* inform APM BIOS that CPU is idle */
void
apm_cpu_idle(void)
{
struct apm_softc *sc = &apm_softc;
if (sc->active) {
sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUIDLE;
sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
(void) apm_bioscall();
}
/*
* Some APM implementation halts CPU in BIOS, whenever
* "CPU-idle" function are invoked, but swtch() of
* FreeBSD halts CPU, therefore, CPU is halted twice
* in the sched loop. It makes the interrupt latency
* terribly long and be able to cause a serious problem
* in interrupt processing. We prevent it by removing
* "hlt" operation from swtch() and managed it under
* APM driver.
*/
if (!sc->active || sc->always_halt_cpu)
halt(); /* wait for interrupt */
}
/* inform APM BIOS that CPU is busy */
void
apm_cpu_busy(void)
{
struct apm_softc *sc = &apm_softc;
/*
* The APM specification says this is only necessary if your BIOS
* slows down the processor in the idle task, otherwise it's not
* necessary.
*/
if (sc->slow_idle_cpu && sc->active) {
sc->bios.r.eax = (APM_BIOS <<8) | APM_CPUBUSY;
sc->bios.r.edx = sc->bios.r.ecx = sc->bios.r.ebx = 0;
apm_bioscall();
}
}
/*
* APM thread loop.
*
* This routine wakes up from time to time to deal with delaying the
* suspend of the system, or other events.
*/
static void
apm_event_thread(void *arg)
{
struct apm_softc *sc = &apm_softc;
sc->running = 1;
while (sc->active) {
if (apm_op_inprog)
apm_lastreq_notify();
if (sc->standbys && sc->standby_countdown-- <= 0)
apm_do_standby();
if (sc->suspends && sc->suspend_countdown-- <= 0)
apm_do_suspend();
if (!sc->bios_busy)
apm_processevent();
mtx_lock(&sc->mtx);
cv_timedwait(&sc->cv, &sc->mtx, 10 * hz / 9);
mtx_unlock(&sc->mtx);
}
sc->running = 0;
kproc_exit(0);
}
/* enable APM BIOS */
static void
apm_event_enable(void)
{
struct apm_softc *sc = &apm_softc;
APM_DPRINT("called apm_event_enable()\n");
if (sc == NULL || sc->initialized == 0)
return;
/* Start the thread */
sc->active = 1;
if (kproc_create(apm_event_thread, sc, &sc->event_thread, 0, 0,
"apm worker"))
panic("Cannot create apm worker thread");
return;
}
/* disable APM BIOS */
static void
apm_event_disable(void)
{
struct apm_softc *sc = &apm_softc;
APM_DPRINT("called apm_event_disable()\n");
if (sc == NULL || sc->initialized == 0)
return;
mtx_lock(&sc->mtx);
sc->active = 0;
while (sc->running) {
cv_broadcast(&sc->cv);
msleep(sc->event_thread, &sc->mtx, PWAIT, "apmdie", 0);
}
mtx_unlock(&sc->mtx);
sc->event_thread = NULL;
return;
}
/* halt CPU in scheduling loop */
static void
apm_halt_cpu(void)
{
struct apm_softc *sc = &apm_softc;
if (sc == NULL || sc->initialized == 0)
return;
sc->always_halt_cpu = 1;
return;
}
/* don't halt CPU in scheduling loop */
static void
apm_not_halt_cpu(void)
{
struct apm_softc *sc = &apm_softc;
if (sc == NULL || sc->initialized == 0)
return;
sc->always_halt_cpu = 0;
return;
}
/* device driver definitions */
/*
* Module event
*/
static int
apm_modevent(struct module *mod, int event, void *junk)
{
switch (event) {
case MOD_LOAD:
if (!cold)
return (EPERM);
break;
case MOD_UNLOAD:
if (!cold && power_pm_get_type() == POWER_PM_TYPE_APM)
return (EBUSY);
break;
default:
break;
}
return (0);
}
/*
* Create "connection point"
*/
static void
apm_identify(driver_t *driver, device_t parent)
{
device_t child;
if (!cold) {
printf("Don't load this driver from userland!!\n");
return;
}
if (resource_disabled("apm", 0))
return;
child = BUS_ADD_CHILD(parent, 0, "apm", 0);
if (child == NULL)
panic("apm_identify");
}
/*
* probe for APM BIOS
*/
static int
apm_probe(device_t dev)
{
#define APM_KERNBASE KERNBASE
struct vm86frame vmf;
struct apm_softc *sc = &apm_softc;
#ifdef PC98
int rid;
#endif
device_set_desc(dev, "APM BIOS");
if (device_get_unit(dev) > 0) {
printf("apm: Only one APM driver supported.\n");
return ENXIO;
}
if (power_pm_get_type() != POWER_PM_TYPE_NONE &&
power_pm_get_type() != POWER_PM_TYPE_APM) {
printf("apm: Other PM system enabled.\n");
return ENXIO;
}
bzero(&vmf, sizeof(struct vm86frame)); /* safety */
bzero(&apm_softc, sizeof(apm_softc));
vmf.vmf_ah = APM_BIOS;
vmf.vmf_al = APM_INSTCHECK;
vmf.vmf_bx = 0;
if (vm86_intcall(APM_INT, &vmf))
return ENXIO; /* APM not found */
if (vmf.vmf_bx != 0x504d) {
printf("apm: incorrect signature (0x%x)\n", vmf.vmf_bx);
return ENXIO;
}
if ((vmf.vmf_cx & (APM_32BIT_SUPPORT | APM_16BIT_SUPPORT)) == 0) {
printf("apm: protected mode connections are not supported\n");
return ENXIO;
}
apm_version = vmf.vmf_ax;
sc->slow_idle_cpu = ((vmf.vmf_cx & APM_CPUIDLE_SLOW) != 0);
sc->disabled = ((vmf.vmf_cx & APM_DISABLED) != 0);
sc->disengaged = ((vmf.vmf_cx & APM_DISENGAGED) != 0);
vmf.vmf_ah = APM_BIOS;
vmf.vmf_al = APM_DISCONNECT;
vmf.vmf_bx = 0;
vm86_intcall(APM_INT, &vmf); /* disconnect, just in case */
#ifdef PC98
/* PC98 have bogos APM 32bit BIOS */
if ((vmf.vmf_cx & APM_32BIT_SUPPORT) == 0)
return ENXIO;
rid = 0;
bus_set_resource(dev, SYS_RES_IOPORT, rid,
APM_NECSMM_PORT, APM_NECSMM_PORTSZ);
sc->sc_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
APM_NECSMM_PORT, ~0, APM_NECSMM_PORTSZ, RF_ACTIVE);
if (sc->sc_res == NULL) {
printf("apm: cannot open NEC smm device\n");
return ENXIO;
}
bus_release_resource(dev, SYS_RES_IOPORT, rid, sc->sc_res);
vmf.vmf_ah = APM_BIOS;
vmf.vmf_al = APM_PROT32CONNECT;
vmf.vmf_bx = 0;
if (vm86_intcall(APM_INT, &vmf)) {
printf("apm: 32-bit connection error.\n");
return (ENXIO);
}
sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
sc->bios.seg.code32.limit = 0xffff;
sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
sc->bios.seg.code16.limit = 0xffff;
sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
sc->bios.seg.data.limit = 0xffff;
sc->bios.entry = vmf.vmf_ebx;
sc->connectmode = APM_PROT32CONNECT;
#else
if ((vmf.vmf_cx & APM_32BIT_SUPPORT) != 0) {
vmf.vmf_ah = APM_BIOS;
vmf.vmf_al = APM_PROT32CONNECT;
vmf.vmf_bx = 0;
if (vm86_intcall(APM_INT, &vmf)) {
printf("apm: 32-bit connection error.\n");
return (ENXIO);
}
sc->bios.seg.code32.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
sc->bios.seg.code32.limit = 0xffff;
sc->bios.seg.code16.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
sc->bios.seg.code16.limit = 0xffff;
sc->bios.seg.data.base = (vmf.vmf_dx << 4) + APM_KERNBASE;
sc->bios.seg.data.limit = 0xffff;
sc->bios.entry = vmf.vmf_ebx;
sc->connectmode = APM_PROT32CONNECT;
} else {
/* use 16-bit connection */
vmf.vmf_ah = APM_BIOS;
vmf.vmf_al = APM_PROT16CONNECT;
vmf.vmf_bx = 0;
if (vm86_intcall(APM_INT, &vmf)) {
printf("apm: 16-bit connection error.\n");
return (ENXIO);
}
sc->bios.seg.code16.base = (vmf.vmf_ax << 4) + APM_KERNBASE;
sc->bios.seg.code16.limit = 0xffff;
sc->bios.seg.data.base = (vmf.vmf_cx << 4) + APM_KERNBASE;
sc->bios.seg.data.limit = 0xffff;
sc->bios.entry = vmf.vmf_bx;
sc->connectmode = APM_PROT16CONNECT;
}
#endif
return(0);
}
/*
* 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(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 */
if (sc->event_filter[event_type] == 0)
return 1; /* not registered */
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;
selwakeuppri(&sc->sc_rsel, PZERO);
return (sc->sc_flags & SCFLAG_OCTL) ? 0 : 1; /* user may handle */
}
/* Power profile */
static void
apm_power_profile(struct apm_softc *sc)
{
int state;
struct apm_info info;
static int apm_acline = 0;
if (apm_get_info(&info))
return;
if (apm_acline != info.ai_acline) {
apm_acline = info.ai_acline;
state = apm_acline ? POWER_PROFILE_PERFORMANCE : POWER_PROFILE_ECONOMY;
power_profile_set_state(state);
}
}
/* Process APM event */
static void
apm_processevent(void)
{
int apm_event;
struct apm_softc *sc = &apm_softc;
#define OPMEV_DEBUGMESSAGE(symbol) case symbol: \
APM_DPRINT("Received APM Event: " #symbol "\n");
do {
apm_event = apm_getevent();
switch (apm_event) {
OPMEV_DEBUGMESSAGE(PMEV_STANDBYREQ);
if (apm_op_inprog == 0) {
apm_op_inprog++;
if (apm_record_event(sc, apm_event)) {
apm_suspend(PMST_STANDBY);
}
}
break;
OPMEV_DEBUGMESSAGE(PMEV_USERSTANDBYREQ);
if (apm_op_inprog == 0) {
apm_op_inprog++;
if (apm_record_event(sc, apm_event)) {
apm_suspend(PMST_STANDBY);
}
}
break;
OPMEV_DEBUGMESSAGE(PMEV_SUSPENDREQ);
apm_lastreq_notify();
if (apm_op_inprog == 0) {
apm_op_inprog++;
if (apm_record_event(sc, apm_event)) {
apm_do_suspend();
}
}
return; /* XXX skip the rest */
OPMEV_DEBUGMESSAGE(PMEV_USERSUSPENDREQ);
apm_lastreq_notify();
if (apm_op_inprog == 0) {
apm_op_inprog++;
if (apm_record_event(sc, apm_event)) {
apm_do_suspend();
}
}
return; /* XXX skip the rest */
OPMEV_DEBUGMESSAGE(PMEV_CRITSUSPEND);
apm_do_suspend();
break;
OPMEV_DEBUGMESSAGE(PMEV_NORMRESUME);
apm_record_event(sc, apm_event);
apm_resume();
break;
OPMEV_DEBUGMESSAGE(PMEV_CRITRESUME);
apm_record_event(sc, apm_event);
apm_resume();
break;
OPMEV_DEBUGMESSAGE(PMEV_STANDBYRESUME);
apm_record_event(sc, apm_event);
break;
OPMEV_DEBUGMESSAGE(PMEV_BATTERYLOW);
if (apm_record_event(sc, apm_event)) {
apm_battery_low();
apm_suspend(PMST_SUSPEND);
}
break;
OPMEV_DEBUGMESSAGE(PMEV_POWERSTATECHANGE);
apm_record_event(sc, apm_event);
apm_power_profile(sc);
break;
OPMEV_DEBUGMESSAGE(PMEV_UPDATETIME);
apm_record_event(sc, apm_event);
inittodr(0); /* adjust time to RTC */
break;
OPMEV_DEBUGMESSAGE(PMEV_CAPABILITIESCHANGE);
apm_record_event(sc, apm_event);
apm_power_profile(sc);
break;
case PMEV_NOEVENT:
break;
default:
printf("Unknown Original APM Event 0x%x\n", apm_event);
break;
}
} while (apm_event != PMEV_NOEVENT);
#ifdef PC98
apm_disable_smm(sc);
#endif
}
/*
* Attach APM:
*
* Initialize APM driver
*/
static int
apm_attach(device_t dev)
{
struct apm_softc *sc = &apm_softc;
int drv_version;
#ifdef PC98
int rid;
#endif
mtx_init(&sc->mtx, device_get_nameunit(dev), "apm", MTX_DEF);
cv_init(&sc->cv, "cbb cv");
if (device_get_flags(dev) & 0x20)
statclock_disable = 1;
sc->initialized = 0;
/* Must be externally enabled */
sc->active = 0;
/* Always call HLT in idle loop */
sc->always_halt_cpu = 1;
getenv_int("debug.apm_debug", &apm_debug);
/* print bootstrap messages */
APM_DPRINT("apm: APM BIOS version %04lx\n", apm_version);
APM_DPRINT("apm: Code16 0x%08x, Data 0x%08x\n",
sc->bios.seg.code16.base, sc->bios.seg.data.base);
APM_DPRINT("apm: Code entry 0x%08x, Idling CPU %s, Management %s\n",
sc->bios.entry, is_enabled(sc->slow_idle_cpu),
is_enabled(!sc->disabled));
APM_DPRINT("apm: CS_limit=0x%x, DS_limit=0x%x\n",
sc->bios.seg.code16.limit, sc->bios.seg.data.limit);
#ifdef PC98
rid = 0;
sc->sc_res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid,
APM_NECSMM_PORT, ~0, APM_NECSMM_PORTSZ, RF_ACTIVE);
if (sc->sc_res == NULL)
panic("%s: counldn't map I/O ports", device_get_name(dev));
sc->sc_iot = rman_get_bustag(sc->sc_res);
sc->sc_ioh = rman_get_bushandle(sc->sc_res);
if (apm_version==0x112 || apm_version==0x111 || apm_version==0x110)
apm_necsmm_addr = APM_NECSMM_PORT;
else
apm_necsmm_addr = 0;
apm_necsmm_mask = ~APM_NECSMM_EN;
#endif /* PC98 */
/*
* In one test, apm bios version was 1.02; an attempt to register
* a 1.04 driver resulted in a 1.00 connection! Registering a
* 1.02 driver resulted in a 1.02 connection.
*/
drv_version = apm_version > 0x102 ? 0x102 : apm_version;
for (; drv_version > 0x100; drv_version--)
if (apm_driver_version(drv_version) == 0)
break;
sc->minorversion = ((drv_version & 0x00f0) >> 4) * 10 +
((drv_version & 0x000f) >> 0);
sc->majorversion = ((drv_version & 0xf000) >> 12) * 10 +
((apm_version & 0x0f00) >> 8);
sc->intversion = INTVERSION(sc->majorversion, sc->minorversion);
if (sc->intversion >= INTVERSION(1, 1))
APM_DPRINT("apm: Engaged control %s\n", is_enabled(!sc->disengaged));
device_printf(dev, "found APM BIOS v%ld.%ld, connected at v%d.%d\n",
((apm_version & 0xf000) >> 12) * 10 + ((apm_version & 0x0f00) >> 8),
((apm_version & 0x00f0) >> 4) * 10 + ((apm_version & 0x000f) >> 0),
sc->majorversion, sc->minorversion);
APM_DPRINT("apm: Slow Idling CPU %s\n", is_enabled(sc->slow_idle_cpu));
/* enable power management */
if (sc->disabled) {
if (apm_enable_disable_pm(1)) {
APM_DPRINT("apm: *Warning* enable function failed! [%x]\n",
(sc->bios.r.eax >> 8) & 0xff);
}
}
/* engage power managment (APM 1.1 or later) */
if (sc->intversion >= INTVERSION(1, 1) && sc->disengaged) {
if (apm_engage_disengage_pm(1)) {
APM_DPRINT("apm: *Warning* engage function failed err=[%x]",
(sc->bios.r.eax >> 8) & 0xff);
APM_DPRINT(" (Docked or using external power?).\n");
}
}
/* Power the system off using APM */
EVENTHANDLER_REGISTER(shutdown_final, apm_power_off, NULL,
SHUTDOWN_PRI_LAST);
/* Register APM again to pass the correct argument of pm_func. */
power_pm_register(POWER_PM_TYPE_APM, apm_pm_func, sc);
sc->initialized = 1;
sc->suspending = 0;
sc->running = 0;
make_dev(&apm_cdevsw, 0, 0, 5, 0664, "apm");
make_dev(&apm_cdevsw, 8, 0, 5, 0660, "apmctl");
return 0;
}
static int
apmopen(struct cdev *dev, int flag, int fmt, struct thread *td)
{
struct apm_softc *sc = &apm_softc;
int ctl = APMDEV(dev);
if (sc == NULL || sc->initialized == 0)
return (ENXIO);
switch (ctl) {
case APMDEV_CTL:
if (!(flag & FWRITE))
return EINVAL;
if (sc->sc_flags & SCFLAG_OCTL)
return EBUSY;
sc->sc_flags |= SCFLAG_OCTL;
bzero(sc->event_filter, sizeof sc->event_filter);
break;
case APMDEV_NORMAL:
sc->sc_flags |= SCFLAG_ONORMAL;
break;
default:
return ENXIO;
break;
}
return 0;
}
static int
apmclose(struct cdev *dev, int flag, int fmt, struct thread *td)
{
struct apm_softc *sc = &apm_softc;
int ctl = APMDEV(dev);
switch (ctl) {
case APMDEV_CTL:
apm_lastreq_rejected();
sc->sc_flags &= ~SCFLAG_OCTL;
bzero(sc->event_filter, sizeof sc->event_filter);
break;
case APMDEV_NORMAL:
sc->sc_flags &= ~SCFLAG_ONORMAL;
break;
}
if ((sc->sc_flags & SCFLAG_OPEN) == 0) {
sc->event_count = 0;
sc->event_ptr = 0;
}
return 0;
}
static int
apmioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
{
struct apm_softc *sc = &apm_softc;
struct apm_bios_arg *args;
int error = 0;
int ret;
int newstate;
if (sc == NULL || sc->initialized == 0)
return (ENXIO);
APM_DPRINT("APM ioctl: cmd = 0x%lx\n", cmd);
switch (cmd) {
case APMIO_SUSPEND:
if (!(flag & FWRITE))
return (EPERM);
if (sc->active)
apm_suspend(PMST_SUSPEND);
else
error = EINVAL;
break;
case APMIO_STANDBY:
if (!(flag & FWRITE))
return (EPERM);
if (sc->active)
apm_suspend(PMST_STANDBY);
else
error = EINVAL;
break;
case APMIO_GETINFO_OLD:
{
struct apm_info info;
apm_info_old_t aiop;
if (apm_get_info(&info))
error = ENXIO;
aiop = (apm_info_old_t)addr;
aiop->ai_major = info.ai_major;
aiop->ai_minor = info.ai_minor;
aiop->ai_acline = info.ai_acline;
aiop->ai_batt_stat = info.ai_batt_stat;
aiop->ai_batt_life = info.ai_batt_life;
aiop->ai_status = info.ai_status;
}
break;
case APMIO_GETINFO:
if (apm_get_info((apm_info_t)addr))
error = ENXIO;
break;
case APMIO_GETPWSTATUS:
if (apm_get_pwstatus((apm_pwstatus_t)addr))
error = ENXIO;
break;
case APMIO_ENABLE:
if (!(flag & FWRITE))
return (EPERM);
apm_event_enable();
break;
case APMIO_DISABLE:
if (!(flag & FWRITE))
return (EPERM);
apm_event_disable();
break;
case APMIO_HALTCPU:
if (!(flag & FWRITE))
return (EPERM);
apm_halt_cpu();
break;
case APMIO_NOTHALTCPU:
if (!(flag & FWRITE))
return (EPERM);
apm_not_halt_cpu();
break;
case APMIO_DISPLAY:
if (!(flag & FWRITE))
return (EPERM);
newstate = *(int *)addr;
if (apm_display(newstate))
error = ENXIO;
break;
case APMIO_BIOS:
if (!(flag & FWRITE))
return (EPERM);
/* XXX compatibility with the old interface */
args = (struct apm_bios_arg *)addr;
sc->bios.r.eax = args->eax;
sc->bios.r.ebx = args->ebx;
sc->bios.r.ecx = args->ecx;
sc->bios.r.edx = args->edx;
sc->bios.r.esi = args->esi;
sc->bios.r.edi = args->edi;
if ((ret = apm_bioscall())) {
/*
* Return code 1 means bios call was unsuccessful.
* Error code is stored in %ah.
* Return code -1 means bios call was unsupported
* in the APM BIOS version.
*/
if (ret == -1) {
error = EINVAL;
}
} else {
/*
* Return code 0 means bios call was successful.
* We need only %al and can discard %ah.
*/
sc->bios.r.eax &= 0xff;
}
args->eax = sc->bios.r.eax;
args->ebx = sc->bios.r.ebx;
args->ecx = sc->bios.r.ecx;
args->edx = sc->bios.r.edx;
args->esi = sc->bios.r.esi;
args->edi = sc->bios.r.edi;
break;
default:
error = EINVAL;
break;
}
/* for /dev/apmctl */
if (APMDEV(dev) == APMDEV_CTL) {
struct apm_event_info *evp;
int i;
error = 0;
switch (cmd) {
case APMIO_NEXTEVENT:
if (!sc->event_count) {
error = EAGAIN;
} else {
evp = (struct apm_event_info *)addr;
i = sc->event_ptr + APM_NEVENTS - sc->event_count;
i %= APM_NEVENTS;
*evp = sc->event_list[i];
sc->event_count--;
}
break;
case APMIO_REJECTLASTREQ:
if (apm_lastreq_rejected()) {
error = EINVAL;
}
break;
default:
error = EINVAL;
break;
}
}
return error;
}
static int
apmwrite(struct cdev *dev, struct uio *uio, int ioflag)
{
struct apm_softc *sc = &apm_softc;
u_int event_type;
int error;
u_char enabled;
if (APMDEV(dev) != APMDEV_CTL)
return(ENODEV);
if (uio->uio_resid != sizeof(u_int))
return(E2BIG);
if ((error = uiomove((caddr_t)&event_type, sizeof(u_int), uio)))
return(error);
if (event_type < 0 || event_type >= APM_NPMEV)
return(EINVAL);
if (sc->event_filter[event_type] == 0) {
enabled = 1;
} else {
enabled = 0;
}
sc->event_filter[event_type] = enabled;
APM_DPRINT("apmwrite: event 0x%x %s\n", event_type, is_enabled(enabled));
return uio->uio_resid;
}
static int
apmpoll(struct cdev *dev, int events, struct thread *td)
{
struct apm_softc *sc = &apm_softc;
int revents = 0;
if (events & (POLLIN | POLLRDNORM)) {
if (sc->event_count) {
revents |= events & (POLLIN | POLLRDNORM);
} else {
selrecord(td, &sc->sc_rsel);
}
}
return (revents);
}
static device_method_t apm_methods[] = {
/* Device interface */
DEVMETHOD(device_identify, apm_identify),
DEVMETHOD(device_probe, apm_probe),
DEVMETHOD(device_attach, apm_attach),
{ 0, 0 }
};
static driver_t apm_driver = {
"apm",
apm_methods,
1, /* no softc (XXX) */
};
static devclass_t apm_devclass;
DRIVER_MODULE(apm, legacy, apm_driver, apm_devclass, apm_modevent, 0);
MODULE_VERSION(apm, 1);
static int
apm_pm_func(u_long cmd, void *arg, ...)
{
int state, apm_state;
int error;
va_list ap;
error = 0;
switch (cmd) {
case POWER_CMD_SUSPEND:
va_start(ap, arg);
state = va_arg(ap, int);
va_end(ap);
switch (state) {
case POWER_SLEEP_STATE_STANDBY:
apm_state = PMST_STANDBY;
break;
case POWER_SLEEP_STATE_SUSPEND:
case POWER_SLEEP_STATE_HIBERNATE:
apm_state = PMST_SUSPEND;
break;
default:
error = EINVAL;
goto out;
}
apm_suspend(apm_state);
break;
default:
error = EINVAL;
goto out;
}
out:
return (error);
}
static void
apm_pm_register(void *arg)
{
if (!resource_disabled("apm", 0))
power_pm_register(POWER_PM_TYPE_APM, apm_pm_func, NULL);
}
SYSINIT(power, SI_SUB_KLD, SI_ORDER_ANY, apm_pm_register, 0);
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