freebsd-dev/sys/dev/acpica/acpi_cmbat.c

/*-
 * Copyright (c) 2000 Munehiro Matsuda
 * Copyright (c) 2000 Takanori Watanabe
 * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD$
 */

#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/ioccom.h>

#include <machine/bus.h>
#include <sys/rman.h>
#include <sys/malloc.h>

#include "acpi.h"
#include <dev/acpica/acpivar.h>
#include <dev/acpica/acpiio.h>

MALLOC_DEFINE(M_ACPICMBAT, "acpicmbat", "ACPI control method battery data");

/* Number of times to retry initialization before giving up. */
#define ACPI_CMBAT_RETRY_MAX	6

/* Check the battery once a minute. */
#define	CMBAT_POLLRATE	(60 * hz)

/* Hooks for the ACPI CA debugging infrastructure */
#define	_COMPONENT	ACPI_BATTERY
ACPI_MODULE_NAME("BATTERY")

#define	ACPI_BATTERY_BST_CHANGE 0x80
#define	ACPI_BATTERY_BIF_CHANGE 0x81

struct acpi_cmbat_softc {
    device_t	    dev;

    struct acpi_bif bif;
    struct acpi_bst bst;
    struct timespec bif_lastupdated;
    struct timespec bst_lastupdated;
    int		    bif_updating;
    int		    bst_updating;

    int		    present;
    int		    cap;
    int		    min;
    int		    full_charge_time;
    int		    initializing;
    int		    phys_unit;
};

static struct timespec	acpi_cmbat_info_lastupdated;

/* XXX: devclass_get_maxunit() don't give us the current allocated units. */
static int		acpi_cmbat_units = 0;

static int		acpi_cmbat_info_expired(struct timespec *);
static void		acpi_cmbat_info_updated(struct timespec *);
static void		acpi_cmbat_get_bst(void *);
static void		acpi_cmbat_get_bif(void *);
static void		acpi_cmbat_notify_handler(ACPI_HANDLE, UINT32, void *);
static int		acpi_cmbat_probe(device_t);
static int		acpi_cmbat_attach(device_t);
static int		acpi_cmbat_detach(device_t);
static int		acpi_cmbat_resume(device_t);
static int		acpi_cmbat_ioctl(u_long, caddr_t, void *);
static int		acpi_cmbat_is_bst_valid(struct acpi_bst*);
static int		acpi_cmbat_is_bif_valid(struct acpi_bif*);
static int		acpi_cmbat_get_total_battinfo(struct acpi_battinfo *);
static void		acpi_cmbat_init_battery(void *);

static device_method_t acpi_cmbat_methods[] = {
    /* Device interface */
    DEVMETHOD(device_probe,	acpi_cmbat_probe),
    DEVMETHOD(device_attach,	acpi_cmbat_attach),
    DEVMETHOD(device_detach,	acpi_cmbat_detach),
    DEVMETHOD(device_resume,	acpi_cmbat_resume),

    {0, 0}
};

static driver_t acpi_cmbat_driver = {
    "acpi_cmbat",
    acpi_cmbat_methods,
    sizeof(struct acpi_cmbat_softc),
};

static devclass_t acpi_cmbat_devclass;
DRIVER_MODULE(acpi_cmbat, acpi, acpi_cmbat_driver, acpi_cmbat_devclass, 0, 0);
MODULE_DEPEND(acpi_cmbat, acpi, 1, 1, 1);

static int
acpi_cmbat_info_expired(struct timespec *lastupdated)
{
    struct timespec	curtime;

    if (lastupdated == NULL)
	return (1);
    if (!timespecisset(lastupdated))
	return (1);

    getnanotime(&curtime);
    timespecsub(&curtime, lastupdated);
    return (curtime.tv_sec < 0 ||
	    curtime.tv_sec > acpi_battery_get_info_expire());
}


static void
acpi_cmbat_info_updated(struct timespec *lastupdated)
{
    if (lastupdated != NULL)
	getnanotime(lastupdated);
}

static void
acpi_cmbat_get_bst(void *context)
{
    device_t	dev;
    struct acpi_cmbat_softc *sc;
    ACPI_STATUS	as;
    ACPI_OBJECT	*res;
    ACPI_HANDLE	h;
    ACPI_BUFFER	bst_buffer;

    dev = context;
    sc = device_get_softc(dev);
    h = acpi_get_handle(dev);

    if (!acpi_cmbat_info_expired(&sc->bst_lastupdated))
	return;
    if (sc->bst_updating)
	return;
    sc->bst_updating = 1;

    bst_buffer.Pointer = NULL;
    bst_buffer.Length = ACPI_ALLOCATE_BUFFER;
    as = AcpiEvaluateObject(h, "_BST", NULL, &bst_buffer);
    if (ACPI_FAILURE(as)) {
	ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
		    "error fetching current battery status -- %s\n",
		    AcpiFormatException(as));
	goto end;
    }

    res = (ACPI_OBJECT *)bst_buffer.Pointer;
    if (!ACPI_PKG_VALID(res, 4)) {
	ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
		    "battery status corrupted\n");
	goto end;
    }

    if (acpi_PkgInt32(res, 0, &sc->bst.state) != 0)
	goto end;
    if (acpi_PkgInt32(res, 1, &sc->bst.rate) != 0)
	goto end;
    if (acpi_PkgInt32(res, 2, &sc->bst.cap) != 0)
	goto end;
    if (acpi_PkgInt32(res, 3, &sc->bst.volt) != 0)
	goto end;
    acpi_cmbat_info_updated(&sc->bst_lastupdated);

end:
    if (bst_buffer.Pointer != NULL)
	AcpiOsFree(bst_buffer.Pointer);
    sc->bst_updating = 0;
}

static void
acpi_cmbat_get_bif(void *context)
{
    device_t	dev;
    struct acpi_cmbat_softc *sc;
    ACPI_STATUS	as;
    ACPI_OBJECT	*res;
    ACPI_HANDLE	h;
    ACPI_BUFFER	bif_buffer;

    dev = context;
    sc = device_get_softc(dev);
    h = acpi_get_handle(dev);

    if (!acpi_cmbat_info_expired(&sc->bif_lastupdated))
	return;
    if (sc->bif_updating)
	return;
    sc->bif_updating = 1;

    bif_buffer.Pointer = NULL;
    bif_buffer.Length = ACPI_ALLOCATE_BUFFER;
    as = AcpiEvaluateObject(h, "_BIF", NULL, &bif_buffer);
    if (ACPI_FAILURE(as)) {
	ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
		    "error fetching current battery info -- %s\n",
		    AcpiFormatException(as));
	goto end;
    }

    res = (ACPI_OBJECT *)bif_buffer.Pointer;
    if (!ACPI_PKG_VALID(res, 13)) {
	ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
		    "battery info corrupted\n");
	goto end;
    }

    if (acpi_PkgInt32(res,  0, &sc->bif.units) != 0)
	goto end;
    if (acpi_PkgInt32(res,  1, &sc->bif.dcap) != 0)
	goto end;
    if (acpi_PkgInt32(res,  2, &sc->bif.lfcap) != 0)
	goto end;
    if (acpi_PkgInt32(res,  3, &sc->bif.btech) != 0)
	goto end;
    if (acpi_PkgInt32(res,  4, &sc->bif.dvol) != 0)
	goto end;
    if (acpi_PkgInt32(res,  5, &sc->bif.wcap) != 0)
	goto end;
    if (acpi_PkgInt32(res,  6, &sc->bif.lcap) != 0)
	goto end;
    if (acpi_PkgInt32(res,  7, &sc->bif.gra1) != 0)
	goto end;
    if (acpi_PkgInt32(res,  8, &sc->bif.gra2) != 0)
	goto end;
    if (acpi_PkgStr(res,  9, sc->bif.model, ACPI_CMBAT_MAXSTRLEN) != 0)
	goto end;
    if (acpi_PkgStr(res, 10, sc->bif.serial, ACPI_CMBAT_MAXSTRLEN) != 0)
	goto end;
    if (acpi_PkgStr(res, 11, sc->bif.type, ACPI_CMBAT_MAXSTRLEN) != 0)
	goto end;
    if (acpi_PkgStr(res, 12, sc->bif.oeminfo, ACPI_CMBAT_MAXSTRLEN) != 0)
	goto end;
    acpi_cmbat_info_updated(&sc->bif_lastupdated);

end:
    if (bif_buffer.Pointer != NULL)
	AcpiOsFree(bif_buffer.Pointer);
    sc->bif_updating = 0;
}

static void
acpi_cmbat_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
{
    device_t dev;
    struct acpi_cmbat_softc	*sc;

    dev = (device_t)context;
    if ((sc = device_get_softc(dev)) == NULL)
	return;

    acpi_UserNotify("CMBAT", h, notify);

    switch (notify) {
    case ACPI_NOTIFY_DEVICE_CHECK:
    case ACPI_BATTERY_BST_CHANGE:
	timespecclear(&sc->bst_lastupdated);
	break;
    case ACPI_NOTIFY_BUS_CHECK:
    case ACPI_BATTERY_BIF_CHANGE:
	timespecclear(&sc->bif_lastupdated);
	AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cmbat_get_bif, dev);
	break;
    default:
	break;
    }
}

static int
acpi_cmbat_probe(device_t dev)
{
    static char *cmbat_ids[] = { "PNP0C0A", NULL };

    if (acpi_disabled("cmbat") ||
	ACPI_ID_PROBE(device_get_parent(dev), dev, cmbat_ids) == NULL)
	return (ENXIO);

    device_set_desc(dev, "Control Method Battery");
    return (0);
}

static int
acpi_cmbat_attach(device_t dev)
{
    int		error;
    ACPI_HANDLE	handle;
    struct acpi_cmbat_softc *sc;

    if ((sc = device_get_softc(dev)) == NULL)
	return (ENXIO);

    handle = acpi_get_handle(dev);

    /*
     * Install a system notify handler in addition to the device notify.
     * Toshiba notebook uses this alternate notify for its battery.
     */
    AcpiInstallNotifyHandler(handle, ACPI_SYSTEM_NOTIFY,
			     acpi_cmbat_notify_handler, dev);
    AcpiInstallNotifyHandler(handle, ACPI_DEVICE_NOTIFY,
			     acpi_cmbat_notify_handler, dev);

    sc->bif_updating = sc->bst_updating = 0;
    sc->dev = dev;

    timespecclear(&sc->bif_lastupdated);
    timespecclear(&sc->bst_lastupdated);

    if (acpi_cmbat_units == 0) {
	error = acpi_register_ioctl(ACPIIO_CMBAT_GET_BIF,
				    acpi_cmbat_ioctl, NULL);
	if (error != 0)
	    return (error);
	error = acpi_register_ioctl(ACPIIO_CMBAT_GET_BST,
				    acpi_cmbat_ioctl, NULL);
	if (error != 0)
		return (error);
    }

    sc->phys_unit = acpi_cmbat_units;
    error = acpi_battery_register(ACPI_BATT_TYPE_CMBAT, sc->phys_unit);
    if (error != 0)
	return (error);

    acpi_cmbat_units++;
    timespecclear(&acpi_cmbat_info_lastupdated);
    sc->initializing = 0;
    AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cmbat_init_battery, dev);

    return (0);
}

static int
acpi_cmbat_detach(device_t dev)
{
    struct acpi_cmbat_softc *sc;

    sc = device_get_softc(dev);
    acpi_battery_remove(ACPI_BATT_TYPE_CMBAT, sc->phys_unit);
    acpi_cmbat_units--;
    return (0);
}

static int
acpi_cmbat_resume(device_t dev)
{
    AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cmbat_init_battery, dev);
    return (0);
}

static int
acpi_cmbat_ioctl(u_long cmd, caddr_t addr, void *arg)
{
    device_t	dev;
    union acpi_battery_ioctl_arg *ioctl_arg;
    struct acpi_cmbat_softc *sc;
    struct acpi_bif	*bifp;
    struct acpi_bst	*bstp;

    ioctl_arg = (union acpi_battery_ioctl_arg *)addr;
    dev = devclass_get_device(acpi_cmbat_devclass, ioctl_arg->unit);
    if (dev == NULL)
	return (ENXIO);
    sc = device_get_softc(dev);
    if (sc == NULL)
	return (ENXIO);

    /*
     * No security check required: information retrieval only.  If
     * new functions are added here, a check might be required.
     */
    switch (cmd) {
    case ACPIIO_CMBAT_GET_BIF:
	acpi_cmbat_get_bif(dev);
	bifp = &ioctl_arg->bif;
	bifp->units = sc->bif.units;
	bifp->dcap = sc->bif.dcap;
	bifp->lfcap = sc->bif.lfcap;
	bifp->btech = sc->bif.btech;
	bifp->dvol = sc->bif.dvol;
	bifp->wcap = sc->bif.wcap;
	bifp->lcap = sc->bif.lcap;
	bifp->gra1 = sc->bif.gra1;
	bifp->gra2 = sc->bif.gra2;
	strncpy(bifp->model, sc->bif.model, sizeof(sc->bif.model));
	strncpy(bifp->serial, sc->bif.serial, sizeof(sc->bif.serial));
	strncpy(bifp->type, sc->bif.type, sizeof(sc->bif.type));
	strncpy(bifp->oeminfo, sc->bif.oeminfo, sizeof(sc->bif.oeminfo));
	break;
    case ACPIIO_CMBAT_GET_BST:
	bstp = &ioctl_arg->bst;
	if (acpi_BatteryIsPresent(dev)) {
	    acpi_cmbat_get_bst(dev);
	    bstp->state = sc->bst.state;
	    bstp->rate = sc->bst.rate;
	    bstp->cap = sc->bst.cap;
	    bstp->volt = sc->bst.volt;
	} else {
	    bstp->state = ACPI_BATT_STAT_NOT_PRESENT;
	}
	break;
    default:
	break;
    }

    return (0);
}

static int
acpi_cmbat_is_bst_valid(struct acpi_bst *bst)
{
    if (bst->state >= ACPI_BATT_STAT_MAX || bst->cap == 0xffffffff ||
	bst->volt == 0xffffffff)

	return (0);
    else
	return (1);
}

static int
acpi_cmbat_is_bif_valid(struct acpi_bif *bif)
{
    if (bif->lfcap == 0)
	return (0);
    else
	return (1);
}

static int
acpi_cmbat_get_total_battinfo(struct acpi_battinfo *battinfo)
{
    int		i;
    int		error;
    int		batt_stat;
    int		valid_rate, valid_units;
    int		cap, min;
    int		total_cap, total_min, total_full;
    device_t	dev;
    struct acpi_cmbat_softc *sc;
    static int	bat_units = 0;
    static struct acpi_cmbat_softc **bat = NULL;

    cap = min = -1;
    batt_stat = ACPI_BATT_STAT_NOT_PRESENT;
    error = 0;

    /* Allocate array of softc pointers */
    if (bat_units != acpi_cmbat_units) {
	if (bat != NULL) {
	    free(bat, M_ACPICMBAT);
	    bat = NULL;
	}
	bat_units = 0;
    }
    if (bat == NULL) {
	bat_units = acpi_cmbat_units;
	bat = malloc(sizeof(struct acpi_cmbat_softc *) * bat_units,
		     M_ACPICMBAT, M_NOWAIT);
	if (bat == NULL) {
	    error = ENOMEM;
	    goto out;
	}

	/* Collect softc pointers */
	for (i = 0; i < acpi_cmbat_units; i++) {
	    if ((dev = devclass_get_device(acpi_cmbat_devclass, i)) == NULL) {
		error = ENXIO;
		goto out;
	    }
	    if ((sc = device_get_softc(dev)) == NULL) {
		error = ENXIO;
		goto out;
	    }
	    bat[i] = sc;
	}
    }

    /* Get battery status, valid rate and valid units */
    batt_stat = valid_rate = valid_units = 0;
    for (i = 0; i < acpi_cmbat_units; i++) {
	bat[i]->present = acpi_BatteryIsPresent(bat[i]->dev);
	if (!bat[i]->present)
	    continue;

	acpi_cmbat_get_bst(bat[i]->dev);

	/* If battery not installed, we get strange values */
	if (!acpi_cmbat_is_bst_valid(&(bat[i]->bst)) ||
	    !acpi_cmbat_is_bif_valid(&(bat[i]->bif))) {

	    bat[i]->present = 0;
	    continue;
	}

	valid_units++;
	bat[i]->cap = 100 * bat[i]->bst.cap / bat[i]->bif.lfcap;
	batt_stat |= bat[i]->bst.state;

	if (bat[i]->bst.rate > 0) {
	    /*
	     * XXX Hack to calculate total battery time.
	     * Systems with 2 or more battries, they may get used
	     * one by one, thus bst.rate is set only to the one
	     * in use. For remaining batteries bst.rate = 0, which
	     * makes it impossible to calculate remaining time.
	     * Some other systems may need sum of bst.rate in
	     * dis-charging state.
	     * There for we sum up the bst.rate that is valid
	     * (in dis-charging state), and use the sum to
	     * calcutate remaining batteries' time.
	     */
	    if (bat[i]->bst.state & ACPI_BATT_STAT_DISCHARG)
		valid_rate += bat[i]->bst.rate;
	}
    }

    /* Calculate total battery capacity and time */
    total_cap = total_min = total_full = 0;
    for (i = 0; i < acpi_cmbat_units; i++) {
	if (!bat[i]->present)
	    continue;

	if (valid_rate > 0) {
	    /* Use the sum of bst.rate */
	    bat[i]->min = 60 * bat[i]->bst.cap / valid_rate;
	} else if (bat[i]->full_charge_time > 0) {
	    bat[i]->min = (bat[i]->full_charge_time * bat[i]->cap) / 100;
	} else {
	    /* Couldn't find valid rate and full battery time */
	    bat[i]->min = 0;
	}
	total_min += bat[i]->min;
	total_cap += bat[i]->cap;
	total_full += bat[i]->full_charge_time;
    }

    /* Battery life */
    if (valid_units == 0) {
	cap = -1;
	batt_stat = ACPI_BATT_STAT_NOT_PRESENT;
    } else {
	cap = total_cap / valid_units;
    }

    /* Battery time */
    if (valid_units == 0) {
	min = -1;
    } else if (valid_rate == 0 || (batt_stat & ACPI_BATT_STAT_CHARGING)) {
	if (total_full == 0)
	    min = -1;
	else
	    min = (total_full * cap) / 100;
    } else {
	min = total_min;
    }
    acpi_cmbat_info_updated(&acpi_cmbat_info_lastupdated);

out:
    battinfo->cap = cap;
    battinfo->min = min;
    battinfo->state = batt_stat;

    return (error);
}

static void
acpi_cmbat_init_battery(void *arg)
{
    int		retry;
    device_t	dev = (device_t)arg;
    struct acpi_cmbat_softc *sc = device_get_softc(dev);

    if (sc->initializing)
	return;

    sc->initializing = 1;
    ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
		"battery initialization start\n");

    for (retry = 0; retry < ACPI_CMBAT_RETRY_MAX; retry++, AcpiOsSleep(10, 0)) {
	sc->present = acpi_BatteryIsPresent(dev);
	if (!sc->present)
	    continue;

	timespecclear(&sc->bst_lastupdated);
	timespecclear(&sc->bif_lastupdated);

	acpi_cmbat_get_bst(dev);
	if (!acpi_cmbat_is_bst_valid(&sc->bst))
	    continue;

	acpi_cmbat_get_bif(dev);
	if (!acpi_cmbat_is_bif_valid(&sc->bif))
	    continue;
	break;
    }

    sc->initializing = 0;
    if (retry == ACPI_CMBAT_RETRY_MAX) {
	ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
		    "battery initialization failed, giving up\n");
    } else {
	ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
		    "battery initialization done, tried %d times\n", retry + 1);
    }
}

/*
 * Public interfaces.
 */
int
acpi_cmbat_get_battinfo(int unit, struct acpi_battinfo *battinfo)
{
    int		error;
    device_t	dev;
    struct acpi_cmbat_softc *sc;

    if (unit == -1)
	return (acpi_cmbat_get_total_battinfo(battinfo));

    if (acpi_cmbat_info_expired(&acpi_cmbat_info_lastupdated)) {
	error = acpi_cmbat_get_total_battinfo(battinfo);
	if (error)
	    goto out;
    }

    error = 0;
    if (unit >= acpi_cmbat_units) {
	error = ENXIO;
	goto out;
    }

    if ((dev = devclass_get_device(acpi_cmbat_devclass, unit)) == NULL) {
	error = ENXIO;
	goto out;
    }
    if ((sc = device_get_softc(dev)) == NULL) {
	error = ENXIO;
	goto out;
    }

    if (!sc->present) {
	battinfo->cap = -1;
	battinfo->min = -1;
	battinfo->state = ACPI_BATT_STAT_NOT_PRESENT;
    } else {
	battinfo->cap = sc->cap;
	battinfo->min = sc->min;
	battinfo->state = sc->bst.state;
    }

out:
    return (error);
}