The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_cmbat.c

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    1 /*-
    2  * Copyright (c) 2005 Nate Lawson
    3  * Copyright (c) 2000 Munehiro Matsuda
    4  * Copyright (c) 2000 Takanori Watanabe
    5  * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   32 
   33 #include "opt_acpi.h"
   34 #include <sys/param.h>
   35 #include <sys/kernel.h>
   36 #include <sys/module.h>
   37 #include <sys/bus.h>
   38 #include <sys/ioccom.h>
   39 
   40 #include <machine/bus.h>
   41 #include <sys/rman.h>
   42 #include <sys/malloc.h>
   43 
   44 #include <contrib/dev/acpica/include/acpi.h>
   45 
   46 #include <dev/acpica/acpivar.h>
   47 #include <dev/acpica/acpiio.h>
   48 
   49 static MALLOC_DEFINE(M_ACPICMBAT, "acpicmbat",
   50     "ACPI control method battery data");
   51 
   52 /* Number of times to retry initialization before giving up. */
   53 #define ACPI_CMBAT_RETRY_MAX    6
   54 
   55 /* Check the battery once a minute. */
   56 #define CMBAT_POLLRATE          (60 * hz)
   57 
   58 /* Hooks for the ACPI CA debugging infrastructure */
   59 #define _COMPONENT      ACPI_BATTERY
   60 ACPI_MODULE_NAME("BATTERY")
   61 
   62 #define ACPI_BATTERY_BST_CHANGE 0x80
   63 #define ACPI_BATTERY_BIF_CHANGE 0x81
   64 #define ACPI_BATTERY_BIX_CHANGE ACPI_BATTERY_BIF_CHANGE
   65 
   66 struct acpi_cmbat_softc {
   67     device_t        dev;
   68     int             flags;
   69 
   70     struct acpi_bix bix;
   71     struct acpi_bst bst;
   72     struct timespec bst_lastupdated;
   73 };
   74 
   75 ACPI_SERIAL_DECL(cmbat, "ACPI cmbat");
   76 
   77 static int              acpi_cmbat_probe(device_t dev);
   78 static int              acpi_cmbat_attach(device_t dev);
   79 static int              acpi_cmbat_detach(device_t dev);
   80 static int              acpi_cmbat_resume(device_t dev);
   81 static void             acpi_cmbat_notify_handler(ACPI_HANDLE h, UINT32 notify,
   82                             void *context);
   83 static int              acpi_cmbat_info_expired(struct timespec *lastupdated);
   84 static void             acpi_cmbat_info_updated(struct timespec *lastupdated);
   85 static void             acpi_cmbat_get_bst(void *arg);
   86 static void             acpi_cmbat_get_bix_task(void *arg);
   87 static void             acpi_cmbat_get_bix(void *arg);
   88 static int              acpi_cmbat_bst(device_t, struct acpi_bst *);
   89 static int              acpi_cmbat_bix(device_t, void *, size_t);
   90 static void             acpi_cmbat_init_battery(void *arg);
   91 
   92 static device_method_t acpi_cmbat_methods[] = {
   93     /* Device interface */
   94     DEVMETHOD(device_probe,     acpi_cmbat_probe),
   95     DEVMETHOD(device_attach,    acpi_cmbat_attach),
   96     DEVMETHOD(device_detach,    acpi_cmbat_detach),
   97     DEVMETHOD(device_resume,    acpi_cmbat_resume),
   98 
   99     /* ACPI battery interface */
  100     DEVMETHOD(acpi_batt_get_info, acpi_cmbat_bix),
  101     DEVMETHOD(acpi_batt_get_status, acpi_cmbat_bst),
  102 
  103     DEVMETHOD_END
  104 };
  105 
  106 static driver_t acpi_cmbat_driver = {
  107     "battery",
  108     acpi_cmbat_methods,
  109     sizeof(struct acpi_cmbat_softc),
  110 };
  111 
  112 static devclass_t acpi_cmbat_devclass;
  113 DRIVER_MODULE(acpi_cmbat, acpi, acpi_cmbat_driver, acpi_cmbat_devclass, 0, 0);
  114 MODULE_DEPEND(acpi_cmbat, acpi, 1, 1, 1);
  115 
  116 static int
  117 acpi_cmbat_probe(device_t dev)
  118 {
  119     static char *cmbat_ids[] = { "PNP0C0A", NULL };
  120 
  121     if (acpi_disabled("cmbat") ||
  122         ACPI_ID_PROBE(device_get_parent(dev), dev, cmbat_ids) == NULL)
  123         return (ENXIO);
  124 
  125     device_set_desc(dev, "ACPI Control Method Battery");
  126     return (0);
  127 }
  128 
  129 static int
  130 acpi_cmbat_attach(device_t dev)
  131 {
  132     int         error;
  133     ACPI_HANDLE handle;
  134     struct acpi_cmbat_softc *sc;
  135 
  136     sc = device_get_softc(dev);
  137     handle = acpi_get_handle(dev);
  138     sc->dev = dev;
  139 
  140     timespecclear(&sc->bst_lastupdated);
  141 
  142     error = acpi_battery_register(dev);
  143     if (error != 0) {
  144         device_printf(dev, "registering battery failed\n");
  145         return (error);
  146     }
  147 
  148     /*
  149      * Install a system notify handler in addition to the device notify.
  150      * Toshiba notebook uses this alternate notify for its battery.
  151      */
  152     AcpiInstallNotifyHandler(handle, ACPI_ALL_NOTIFY,
  153         acpi_cmbat_notify_handler, dev);
  154 
  155     AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cmbat_init_battery, dev);
  156 
  157     return (0);
  158 }
  159 
  160 static int
  161 acpi_cmbat_detach(device_t dev)
  162 {
  163     ACPI_HANDLE handle;
  164 
  165     handle = acpi_get_handle(dev);
  166     AcpiRemoveNotifyHandler(handle, ACPI_ALL_NOTIFY, acpi_cmbat_notify_handler);
  167     acpi_battery_remove(dev);
  168 
  169     /*
  170      * Force any pending notification handler calls to complete by
  171      * requesting cmbat serialisation while freeing and clearing the
  172      * softc pointer:
  173      */
  174     ACPI_SERIAL_BEGIN(cmbat);
  175     device_set_softc(dev, NULL);
  176     ACPI_SERIAL_END(cmbat);
  177 
  178     return (0);
  179 }
  180 
  181 static int
  182 acpi_cmbat_resume(device_t dev)
  183 {
  184 
  185     AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cmbat_init_battery, dev);
  186     return (0);
  187 }
  188 
  189 static void
  190 acpi_cmbat_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
  191 {
  192     struct acpi_cmbat_softc *sc;
  193     device_t dev;
  194 
  195     dev = (device_t)context;
  196     sc = device_get_softc(dev);
  197 
  198     switch (notify) {
  199     case ACPI_NOTIFY_DEVICE_CHECK:
  200     case ACPI_BATTERY_BST_CHANGE:
  201         /*
  202          * Clear the last updated time.  The next call to retrieve the
  203          * battery status will get the new value for us.
  204          */
  205         timespecclear(&sc->bst_lastupdated);
  206         break;
  207     case ACPI_NOTIFY_BUS_CHECK:
  208     case ACPI_BATTERY_BIX_CHANGE:
  209         /*
  210          * Queue a callback to get the current battery info from thread
  211          * context.  It's not safe to block in a notify handler.
  212          */
  213         AcpiOsExecute(OSL_NOTIFY_HANDLER, acpi_cmbat_get_bix_task, dev);
  214         break;
  215     }
  216 
  217     acpi_UserNotify("CMBAT", h, notify);
  218 }
  219 
  220 static int
  221 acpi_cmbat_info_expired(struct timespec *lastupdated)
  222 {
  223     struct timespec     curtime;
  224 
  225     ACPI_SERIAL_ASSERT(cmbat);
  226 
  227     if (lastupdated == NULL)
  228         return (TRUE);
  229     if (!timespecisset(lastupdated))
  230         return (TRUE);
  231 
  232     getnanotime(&curtime);
  233     timespecsub(&curtime, lastupdated);
  234     return (curtime.tv_sec < 0 ||
  235             curtime.tv_sec > acpi_battery_get_info_expire());
  236 }
  237 
  238 static void
  239 acpi_cmbat_info_updated(struct timespec *lastupdated)
  240 {
  241 
  242     ACPI_SERIAL_ASSERT(cmbat);
  243 
  244     if (lastupdated != NULL)
  245         getnanotime(lastupdated);
  246 }
  247 
  248 static void
  249 acpi_cmbat_get_bst(void *arg)
  250 {
  251     struct acpi_cmbat_softc *sc;
  252     ACPI_STATUS as;
  253     ACPI_OBJECT *res;
  254     ACPI_HANDLE h;
  255     ACPI_BUFFER bst_buffer;
  256     device_t dev;
  257 
  258     ACPI_SERIAL_ASSERT(cmbat);
  259 
  260     dev = arg;
  261     sc = device_get_softc(dev);
  262     h = acpi_get_handle(dev);
  263     bst_buffer.Pointer = NULL;
  264     bst_buffer.Length = ACPI_ALLOCATE_BUFFER;
  265 
  266     if (!acpi_cmbat_info_expired(&sc->bst_lastupdated))
  267         goto end;
  268 
  269     as = AcpiEvaluateObject(h, "_BST", NULL, &bst_buffer);
  270     if (ACPI_FAILURE(as)) {
  271         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  272             "error fetching current battery status -- %s\n",
  273             AcpiFormatException(as));
  274         goto end;
  275     }
  276 
  277     res = (ACPI_OBJECT *)bst_buffer.Pointer;
  278     if (!ACPI_PKG_VALID(res, 4)) {
  279         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  280             "battery status corrupted\n");
  281         goto end;
  282     }
  283 
  284     if (acpi_PkgInt32(res, 0, &sc->bst.state) != 0)
  285         goto end;
  286     if (acpi_PkgInt32(res, 1, &sc->bst.rate) != 0)
  287         goto end;
  288     if (acpi_PkgInt32(res, 2, &sc->bst.cap) != 0)
  289         goto end;
  290     if (acpi_PkgInt32(res, 3, &sc->bst.volt) != 0)
  291         goto end;
  292     acpi_cmbat_info_updated(&sc->bst_lastupdated);
  293 
  294     /* Clear out undefined/extended bits that might be set by hardware. */
  295     sc->bst.state &= ACPI_BATT_STAT_BST_MASK;
  296     if ((sc->bst.state & ACPI_BATT_STAT_INVALID) == ACPI_BATT_STAT_INVALID)
  297         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  298             "battery reports simultaneous charging and discharging\n");
  299 
  300     /* XXX If all batteries are critical, perhaps we should suspend. */
  301     if (sc->bst.state & ACPI_BATT_STAT_CRITICAL) {
  302         if ((sc->flags & ACPI_BATT_STAT_CRITICAL) == 0) {
  303             sc->flags |= ACPI_BATT_STAT_CRITICAL;
  304             device_printf(dev, "critically low charge!\n");
  305         }
  306     } else
  307         sc->flags &= ~ACPI_BATT_STAT_CRITICAL;
  308 
  309 end:
  310     AcpiOsFree(bst_buffer.Pointer);
  311 }
  312 
  313 /* XXX There should be a cleaner way to do this locking. */
  314 static void
  315 acpi_cmbat_get_bix_task(void *arg)
  316 {
  317 
  318     ACPI_SERIAL_BEGIN(cmbat);
  319     acpi_cmbat_get_bix(arg);
  320     ACPI_SERIAL_END(cmbat);
  321 }
  322 
  323 static void
  324 acpi_cmbat_get_bix(void *arg)
  325 {
  326     struct acpi_cmbat_softc *sc;
  327     ACPI_STATUS as;
  328     ACPI_OBJECT *res;
  329     ACPI_HANDLE h;
  330     ACPI_BUFFER bix_buffer;
  331     device_t dev;
  332     int i, n;
  333     const struct {
  334             enum { _BIX, _BIF } type;
  335             char *name;
  336     } bobjs[] = {
  337             { _BIX, "_BIX"},
  338             { _BIF, "_BIF"},
  339     };
  340 
  341     ACPI_SERIAL_ASSERT(cmbat);
  342 
  343     dev = arg;
  344     sc = device_get_softc(dev);
  345     h = acpi_get_handle(dev);
  346     bix_buffer.Pointer = NULL;
  347     bix_buffer.Length = ACPI_ALLOCATE_BUFFER;
  348 
  349     for (n = 0; n < sizeof(bobjs); n++) {
  350         as = AcpiEvaluateObject(h, bobjs[n].name, NULL, &bix_buffer);
  351         if (!ACPI_FAILURE(as)) {
  352             res = (ACPI_OBJECT *)bix_buffer.Pointer;
  353             break;
  354         }
  355         AcpiOsFree(bix_buffer.Pointer);
  356         bix_buffer.Pointer = NULL;
  357         bix_buffer.Length = ACPI_ALLOCATE_BUFFER;
  358     }
  359     /* Both _BIF and _BIX were not found. */
  360     if (n == sizeof(bobjs)) {
  361         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  362             "error fetching current battery info -- %s\n",
  363             AcpiFormatException(as));
  364         goto end;
  365     }
  366 
  367     /*
  368      * ACPI _BIX and _BIF revision mismatch check:
  369      *
  370      * 1. _BIF has no revision field.  The number of fields must be 13.
  371      *
  372      * 2. _BIX has a revision field.  As of ACPI 6.3 it must be "" or
  373      *    "1".  The number of fields will be checked---20 and 21,
  374      *    respectively.
  375      *
  376      *    If the revision number is grater than "1" and the number of
  377      *    fields is grater than 21, it will be treated as compatible with
  378      *    ACPI 6.0 _BIX.  If not, it will be ignored.
  379      */
  380     i = 0;
  381     switch (bobjs[n].type) {
  382     case _BIX:
  383         if (acpi_PkgInt16(res, i++, &sc->bix.rev) != 0) {
  384             ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  385                 "_BIX revision error\n");
  386             goto end;
  387         }
  388 #define ACPI_BIX_REV_MISMATCH_ERR(x, r) do {                    \
  389         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),     \
  390             "_BIX revision mismatch (%u != %u)\n", x, r);       \
  391         goto end;                                               \
  392         } while (0)
  393 
  394         if (ACPI_PKG_VALID_EQ(res, 21)) {       /* ACPI 6.0 _BIX */
  395             /*
  396              * Some models have rev.0 _BIX with 21 members.
  397              * In that case, treat the first 20 members as rev.0 _BIX.
  398              */
  399             if (sc->bix.rev != ACPI_BIX_REV_0 &&
  400                 sc->bix.rev != ACPI_BIX_REV_1)
  401                 ACPI_BIX_REV_MISMATCH_ERR(sc->bix.rev, ACPI_BIX_REV_1);
  402         } else if (ACPI_PKG_VALID_EQ(res, 20)) {/* ACPI 4.0 _BIX */
  403             if (sc->bix.rev != ACPI_BIX_REV_0)
  404                 ACPI_BIX_REV_MISMATCH_ERR(sc->bix.rev, ACPI_BIX_REV_0);
  405         } else if (ACPI_PKG_VALID(res, 22)) {
  406             /* _BIX with 22 or more members. */
  407             if (ACPI_BIX_REV_MIN_CHECK(sc->bix.rev, ACPI_BIX_REV_1 + 1)) {
  408                 /*
  409                  * Unknown revision number.
  410                  * Assume 21 members are compatible with 6.0 _BIX.
  411                  */
  412                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  413                     "Unknown _BIX revision(%u). "
  414                     "Assuming compatible with revision %u.\n",
  415                     sc->bix.rev, ACPI_BIX_REV_1);
  416             } else {
  417                 /*
  418                  * Known revision number.  Ignore the extra members.
  419                  */
  420                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  421                     "Extra objects found in _BIX were ignored.\n");
  422             }
  423         } else {
  424                 /* Invalid _BIX.  Ignore it. */
  425                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  426                     "Invalid _BIX found (rev=%u, count=%u).  Ignored.\n",
  427                     sc->bix.rev, res->Package.Count);
  428                 goto end;
  429         }
  430         break;
  431 #undef  ACPI_BIX_REV_MISMATCH_ERR
  432     case _BIF:
  433         if (ACPI_PKG_VALID_EQ(res, 13)) /* _BIF */
  434             sc->bix.rev = ACPI_BIX_REV_BIF;
  435         else {
  436                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  437                     "Invalid _BIF found (count=%u).  Ignored.\n",
  438                     res->Package.Count);
  439                 goto end;
  440         }
  441         break;
  442     }
  443 
  444     ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  445         "rev = %04x\n", sc->bix.rev);
  446 #define BIX_GETU32(NAME)        do {                    \
  447     ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev), \
  448         #NAME " = %u\n", sc->bix.NAME);                 \
  449     if (acpi_PkgInt32(res, i++, &sc->bix.NAME) != 0)    \
  450             goto end;                                   \
  451     } while (0)
  452 
  453     BIX_GETU32(units);
  454     BIX_GETU32(dcap);
  455     BIX_GETU32(lfcap);
  456     BIX_GETU32(btech);
  457     BIX_GETU32(dvol);
  458     BIX_GETU32(wcap);
  459     BIX_GETU32(lcap);
  460     if (ACPI_BIX_REV_MIN_CHECK(sc->bix.rev, ACPI_BIX_REV_0)) {
  461             BIX_GETU32(cycles);
  462             BIX_GETU32(accuracy);
  463             BIX_GETU32(stmax);
  464             BIX_GETU32(stmin);
  465             BIX_GETU32(aimax);
  466             BIX_GETU32(aimin);
  467     }
  468     BIX_GETU32(gra1);
  469     BIX_GETU32(gra2);
  470     if (acpi_PkgStr(res, i++, sc->bix.model, ACPI_CMBAT_MAXSTRLEN) != 0)
  471             goto end;
  472     if (acpi_PkgStr(res, i++, sc->bix.serial, ACPI_CMBAT_MAXSTRLEN) != 0)
  473             goto end;
  474     if (acpi_PkgStr(res, i++, sc->bix.type, ACPI_CMBAT_MAXSTRLEN) != 0)
  475             goto end;
  476     if (acpi_PkgStr(res, i++, sc->bix.oeminfo, ACPI_CMBAT_MAXSTRLEN) != 0)
  477             goto end;
  478     if (ACPI_BIX_REV_MIN_CHECK(sc->bix.rev, ACPI_BIX_REV_1))
  479             BIX_GETU32(scap);
  480 #undef  BIX_GETU32
  481 end:
  482     AcpiOsFree(bix_buffer.Pointer);
  483 }
  484 
  485 static int
  486 acpi_cmbat_bix(device_t dev, void *bix, size_t len)
  487 {
  488     struct acpi_cmbat_softc *sc;
  489 
  490     if (len != sizeof(struct acpi_bix) &&
  491         len != sizeof(struct acpi_bif))
  492             return (-1);
  493 
  494     sc = device_get_softc(dev);
  495 
  496     /*
  497      * Just copy the data.  The only value that should change is the
  498      * last-full capacity, so we only update when we get a notify that says
  499      * the info has changed.  Many systems apparently take a long time to
  500      * process a _BI[FX] call so we avoid it if possible.
  501      */
  502     ACPI_SERIAL_BEGIN(cmbat);
  503     memcpy(bix, &sc->bix, len);
  504     ACPI_SERIAL_END(cmbat);
  505 
  506     return (0);
  507 }
  508 
  509 static int
  510 acpi_cmbat_bst(device_t dev, struct acpi_bst *bst)
  511 {
  512     struct acpi_cmbat_softc *sc;
  513 
  514     sc = device_get_softc(dev);
  515 
  516     ACPI_SERIAL_BEGIN(cmbat);
  517     if (acpi_BatteryIsPresent(dev)) {
  518         acpi_cmbat_get_bst(dev);
  519         memcpy(bst, &sc->bst, sizeof(*bst));
  520     } else
  521         bst->state = ACPI_BATT_STAT_NOT_PRESENT;
  522     ACPI_SERIAL_END(cmbat);
  523 
  524     return (0);
  525 }
  526 
  527 static void
  528 acpi_cmbat_init_battery(void *arg)
  529 {
  530     struct acpi_cmbat_softc *sc;
  531     int         retry, valid;
  532     device_t    dev;
  533 
  534     dev = (device_t)arg;
  535     ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  536         "battery enitialization start\n");
  537 
  538     /*
  539      * Try repeatedly to get valid data from the battery.  Since the
  540      * embedded controller isn't always ready just after boot, we may have
  541      * to wait a while.
  542      */
  543     for (retry = 0; retry < ACPI_CMBAT_RETRY_MAX; retry++, AcpiOsSleep(10000)) {
  544         /*
  545          * Batteries on DOCK can be ejected w/ DOCK during retrying.
  546          *
  547          * If there is a valid softc pointer the device may be in
  548          * attaching, attached or detaching state. If the state is
  549          * different from attached retry getting the device state
  550          * until it becomes stable. This solves a race if the ACPI
  551          * notification handler is called during attach, because
  552          * device_is_attached() doesn't return non-zero until after
  553          * the attach code has been executed.
  554          */
  555         ACPI_SERIAL_BEGIN(cmbat);
  556         sc = device_get_softc(dev);
  557         if (sc == NULL) {
  558             ACPI_SERIAL_END(cmbat);
  559             return;
  560         }
  561 
  562         if (!acpi_BatteryIsPresent(dev) || !device_is_attached(dev)) {
  563             ACPI_SERIAL_END(cmbat);
  564             continue;
  565         }
  566 
  567         /*
  568          * Only query the battery if this is the first try or the specific
  569          * type of info is still invalid.
  570          */
  571         if (retry == 0 || !acpi_battery_bst_valid(&sc->bst)) {
  572             timespecclear(&sc->bst_lastupdated);
  573             acpi_cmbat_get_bst(dev);
  574         }
  575         if (retry == 0 || !acpi_battery_bix_valid(&sc->bix))
  576             acpi_cmbat_get_bix(dev);
  577 
  578         valid = acpi_battery_bst_valid(&sc->bst) &&
  579             acpi_battery_bix_valid(&sc->bix);
  580         ACPI_SERIAL_END(cmbat);
  581 
  582         if (valid)
  583             break;
  584     }
  585 
  586     if (retry == ACPI_CMBAT_RETRY_MAX) {
  587         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  588             "battery initialization failed, giving up\n");
  589     } else {
  590         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
  591             "battery initialization done, tried %d times\n", retry + 1);
  592     }
  593 }

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