FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_cmbat.c

     /*-
      * Copyright (c) 2005 Nate Lawson
      * 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: src/sys/dev/acpica/acpi_cmbat.c,v 1.46.8.1 2009/04/15 03:14:26 kensmith Exp $
     */
    
    #include "opt_acpi.h"
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/bus.h>
    
    #include <sys/rman.h>
    
    #include "acpi.h"
    #include <dev/acpica/acpivar.h>
    #include <dev/acpica/acpiio.h>
    
    /* 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;
        int             flags;
    
        struct acpi_bif bif;
        struct acpi_bst bst;
        struct timespec bst_lastupdated;
    };
    
    ACPI_SERIAL_DECL(cmbat, "ACPI cmbat");
    
    static int              acpi_cmbat_probe(device_t dev);
    static int              acpi_cmbat_attach(device_t dev);
    static int              acpi_cmbat_detach(device_t dev);
    static int              acpi_cmbat_resume(device_t dev);
    static void             acpi_cmbat_notify_handler(ACPI_HANDLE h, UINT32 notify,
                                void *context);
    static int              acpi_cmbat_info_expired(struct timespec *lastupdated);
    static void             acpi_cmbat_info_updated(struct timespec *lastupdated);
    static void             acpi_cmbat_get_bst(void *arg);
    static void             acpi_cmbat_get_bif_task(void *arg);
    static void             acpi_cmbat_get_bif(void *arg);
    static int              acpi_cmbat_bst(device_t dev, struct acpi_bst *bstp);
    static int              acpi_cmbat_bif(device_t dev, struct acpi_bif *bifp);
    static void             acpi_cmbat_init_battery(void *arg);
    
    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),
    
        /* ACPI battery interface */
        DEVMETHOD(acpi_batt_get_info, acpi_cmbat_bif),
        DEVMETHOD(acpi_batt_get_status, acpi_cmbat_bst),
    
        DEVMETHOD_END
    };
    
    static driver_t acpi_cmbat_driver = {
        "battery",
        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, NULL, NULL);
   MODULE_DEPEND(acpi_cmbat, acpi, 1, 1, 1);
   
   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, "ACPI Control Method Battery");
       return (0);
   }
   
   static int
   acpi_cmbat_attach(device_t dev)
   {
       int         error;
       ACPI_HANDLE handle;
       struct acpi_cmbat_softc *sc;
   
       sc = device_get_softc(dev);
       handle = acpi_get_handle(dev);
       sc->dev = dev;
   
       ACPI_SERIAL_INIT(cmbat);
   
       timespecclear(&sc->bst_lastupdated);
   
       error = acpi_battery_register(dev);
       if (error != 0) {
           device_printf(dev, "registering battery failed\n");
           return (error);
       }
   
       /*
        * Install a system notify handler in addition to the device notify.
        * Toshiba notebook uses this alternate notify for its battery.
        */
       AcpiInstallNotifyHandler(handle, ACPI_ALL_NOTIFY,
           acpi_cmbat_notify_handler, dev);
   
       AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cmbat_init_battery, dev);
   
       return (0);
   }
   
   static int
   acpi_cmbat_detach(device_t dev)
   {
       ACPI_HANDLE handle;
   
       handle = acpi_get_handle(dev);
       AcpiRemoveNotifyHandler(handle, ACPI_ALL_NOTIFY, acpi_cmbat_notify_handler);
       acpi_battery_remove(dev);
       return (0);
   }
   
   static int
   acpi_cmbat_resume(device_t dev)
   {
   
       AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cmbat_init_battery, dev);
       return (0);
   }
   
   static void
   acpi_cmbat_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
   {
       struct acpi_cmbat_softc *sc;
       device_t dev;
   
       dev = (device_t)context;
       sc = device_get_softc(dev);
   
       switch (notify) {
       case ACPI_NOTIFY_DEVICE_CHECK:
       case ACPI_BATTERY_BST_CHANGE:
           /*
            * Clear the last updated time.  The next call to retrieve the
            * battery status will get the new value for us.
            */
           timespecclear(&sc->bst_lastupdated);
           break;
       case ACPI_NOTIFY_BUS_CHECK:
       case ACPI_BATTERY_BIF_CHANGE:
           /*
            * Queue a callback to get the current battery info from thread
            * context.  It's not safe to block in a notify handler.
            */
           AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cmbat_get_bif_task, dev);
           break;
       }
   
       acpi_UserNotify("CMBAT", h, notify);
   }
   
   static int
   acpi_cmbat_info_expired(struct timespec *lastupdated)
   {
       struct timespec     curtime;
   
       ACPI_SERIAL_ASSERT(cmbat);
   
       if (lastupdated == NULL)
           return (TRUE);
       if (!timespecisset(lastupdated))
           return (TRUE);
   
       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)
   {
   
       ACPI_SERIAL_ASSERT(cmbat);
   
       if (lastupdated != NULL)
           getnanotime(lastupdated);
   }
   
   static void
   acpi_cmbat_get_bst(void *arg)
   {
       struct acpi_cmbat_softc *sc;
       ACPI_STATUS as;
       ACPI_OBJECT *res;
       ACPI_HANDLE h;
       ACPI_BUFFER bst_buffer;
       device_t dev;
   
       ACPI_SERIAL_ASSERT(cmbat);
   
       dev = arg;
       sc = device_get_softc(dev);
       h = acpi_get_handle(dev);
       bst_buffer.Pointer = NULL;
       bst_buffer.Length = ACPI_ALLOCATE_BUFFER;
   
       if (!acpi_cmbat_info_expired(&sc->bst_lastupdated))
           goto end;
   
       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);
   
       /* XXX If all batteries are critical, perhaps we should suspend. */
       if (sc->bst.state & ACPI_BATT_STAT_CRITICAL) {
           if ((sc->flags & ACPI_BATT_STAT_CRITICAL) == 0) {
               sc->flags |= ACPI_BATT_STAT_CRITICAL;
               device_printf(dev, "critically low charge!\n");
           }
       } else
           sc->flags &= ~ACPI_BATT_STAT_CRITICAL;
   
   end:
       if (bst_buffer.Pointer != NULL)
           AcpiOsFree(bst_buffer.Pointer);
   }
   
   /* XXX There should be a cleaner way to do this locking. */
   static void
   acpi_cmbat_get_bif_task(void *arg)
   {
   
       ACPI_SERIAL_BEGIN(cmbat);
       acpi_cmbat_get_bif(arg);
       ACPI_SERIAL_END(cmbat);
   }
   
   static void
   acpi_cmbat_get_bif(void *arg)
   {
       struct acpi_cmbat_softc *sc;
       ACPI_STATUS as;
       ACPI_OBJECT *res;
       ACPI_HANDLE h;
       ACPI_BUFFER bif_buffer;
       device_t dev;
   
       ACPI_SERIAL_ASSERT(cmbat);
   
       dev = arg;
       sc = device_get_softc(dev);
       h = acpi_get_handle(dev);
       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;
   
   end:
       if (bif_buffer.Pointer != NULL)
           AcpiOsFree(bif_buffer.Pointer);
   }
   
   static int
   acpi_cmbat_bif(device_t dev, struct acpi_bif *bifp)
   {
       struct acpi_cmbat_softc *sc;
   
       sc = device_get_softc(dev);
   
       /*
        * Just copy the data.  The only value that should change is the
        * last-full capacity, so we only update when we get a notify that says
        * the info has changed.  Many systems apparently take a long time to
        * process a _BIF call so we avoid it if possible.
        */
       ACPI_SERIAL_BEGIN(cmbat);
       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));
       ACPI_SERIAL_END(cmbat);
   
       return (0);
   }
   
   static int
   acpi_cmbat_bst(device_t dev, struct acpi_bst *bstp)
   {
       struct acpi_cmbat_softc *sc;
   
       sc = device_get_softc(dev);
   
       ACPI_SERIAL_BEGIN(cmbat);
       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;
       ACPI_SERIAL_END(cmbat);
   
       return (0);
   }
   
   static void
   acpi_cmbat_init_battery(void *arg)
   {
       struct acpi_cmbat_softc *sc;
       int         retry, valid;
       device_t    dev;
   
       dev = (device_t)arg;
       sc = device_get_softc(dev);
       ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
                   "battery initialization start\n");
   
       /*
        * Try repeatedly to get valid data from the battery.  Since the
        * embedded controller isn't always ready just after boot, we may have
        * to wait a while.
        */
       for (retry = 0; retry < ACPI_CMBAT_RETRY_MAX; retry++, AcpiOsSleep(10000)) {
           /* batteries on DOCK can be ejected w/ DOCK during retrying */
           if (!device_is_attached(dev))
               return;
   
           if (!acpi_BatteryIsPresent(dev))
               continue;
   
           /*
            * Only query the battery if this is the first try or the specific
            * type of info is still invalid.
            */
           ACPI_SERIAL_BEGIN(cmbat);
           if (retry == 0 || !acpi_battery_bst_valid(&sc->bst)) {
               timespecclear(&sc->bst_lastupdated);
               acpi_cmbat_get_bst(dev);
           }
           if (retry == 0 || !acpi_battery_bif_valid(&sc->bif))
               acpi_cmbat_get_bif(dev);
   
           valid = acpi_battery_bst_valid(&sc->bst) &&
               acpi_battery_bif_valid(&sc->bif);
           ACPI_SERIAL_END(cmbat);
   
           if (valid)
               break;
       }
   
       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);
       }
   }

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