sys/dev/acpica/acpi_cmbat.c

   1 /*-
   2  * Copyright (c) 2000 Munehiro Matsuda
   3  * Copyright (c) 2000 Takanori Watanabe
   4  * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sys/dev/acpica/acpi_cmbat.c,v 1.22.2.1 2003/08/22 20:49:20 jhb Exp $
  29  *      $DragonFly: src/sys/dev/acpica/Attic/acpi_cmbat.c,v 1.2 2004/05/05 22:19:23 dillon Exp $
  30  */
  31
  32 #include "opt_acpi.h"
  33 #include <sys/param.h>
  34 #include <sys/kernel.h>
  35 #include <sys/bus.h>
  36 #include <sys/ioccom.h>
  37 #include <sys/conf.h>
  38
  39 #include <machine/bus.h>
  40 #include <machine/resource.h>
  41 #include <sys/rman.h>
  42 #include <sys/malloc.h>
  43
  44 #include  "acpi.h"
  45
  46 #include <dev/acpica/acpivar.h>
  47 #include <dev/acpica/acpiio.h>
  48
  49 MALLOC_DEFINE(M_ACPICMBAT, "acpicmbat", "ACPI control method battery data");
  50
  51 #define CMBAT_POLLRATE  (60 * hz)
  52
  53 /*
  54  * Hooks for the ACPI CA debugging infrastructure
  55  */
  56 #define _COMPONENT      ACPI_BATTERY
  57 ACPI_MODULE_NAME("BATTERY")
  58
  59 #define ACPI_BATTERY_BST_CHANGE 0x80
  60 #define ACPI_BATTERY_BIF_CHANGE 0x81
  61
  62 #define PKG_GETINT(res, tmp, idx, dest, label) do {                     \
  63         tmp = &res->Package.Elements[idx];                              \
  64         if (tmp == NULL) {                                              \
  65                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),     \
  66                     "%s: PKG_GETINT error, idx = %d\n.", __func__, idx); \
  67                 goto label;                                             \
  68         }                                                               \
  69         if (tmp->Type != ACPI_TYPE_INTEGER)                             \
  70                 goto label;                                             \
  71         dest = tmp->Integer.Value;                                      \
  72 } while (0)
  73
  74 #define PKG_GETSTR(res, tmp, idx, dest, size, label) do {               \
  75         size_t  length;                                                 \
  76         length = size;                                                  \
  77         tmp = &res->Package.Elements[idx];                              \
  78         if (tmp == NULL) {                                              \
  79                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),     \
  80                     "%s: PKG_GETSTR error, idx = %d\n.", __func__, idx); \
  81                 goto label;                                             \
  82         }                                                               \
  83         bzero(dest, sizeof(dest));                                      \
  84         switch (tmp->Type) {                                            \
  85         case ACPI_TYPE_STRING:                                          \
  86                 if (tmp->String.Length < length) {                      \
  87                         length = tmp->String.Length;                    \
  88                 }                                                       \
  89                 strncpy(dest, tmp->String.Pointer, length);             \
  90                 break;                                                  \
  91         case ACPI_TYPE_BUFFER:                                          \
  92                 if (tmp->Buffer.Length < length) {                      \
  93                         length = tmp->Buffer.Length;                    \
  94                 }                                                       \
  95                 strncpy(dest, tmp->Buffer.Pointer, length);             \
  96                 break;                                                  \
  97         default:                                                        \
  98                 goto label;                                             \
  99         }                                                               \
 100         dest[sizeof(dest)-1] = '\0';                                    \
 101 } while (0)
 102
 103 struct acpi_cmbat_softc {
 104         device_t        dev;
 105
 106         struct acpi_bif bif;
 107         struct acpi_bst bst;
 108         struct timespec bif_lastupdated;
 109         struct timespec bst_lastupdated;
 110         int             bif_updating;
 111         int             bst_updating;
 112
 113         int             present;
 114         int             cap;
 115         int             min;
 116         int             full_charge_time;
 117         int             initializing;
 118 };
 119
 120 static struct timespec   acpi_cmbat_info_lastupdated;
 121
 122 /* XXX: devclass_get_maxunit() don't give us the current allocated units... */
 123 static int               acpi_cmbat_units = 0;
 124
 125 static int               acpi_cmbat_info_expired(struct timespec *);
 126 static void              acpi_cmbat_info_updated(struct timespec *);
 127 static void              acpi_cmbat_get_bst(void *);
 128 static void              acpi_cmbat_get_bif(void *);
 129 static void              acpi_cmbat_notify_handler(ACPI_HANDLE, UINT32, void *);
 130 static int               acpi_cmbat_probe(device_t);
 131 static int               acpi_cmbat_attach(device_t);
 132 static int               acpi_cmbat_resume(device_t);
 133 static int               acpi_cmbat_ioctl(u_long, caddr_t, void *);
 134 static int               acpi_cmbat_is_bst_valid(struct acpi_bst*);
 135 static int               acpi_cmbat_is_bif_valid(struct acpi_bif*);
 136 static int               acpi_cmbat_get_total_battinfo(struct acpi_battinfo *);
 137 static void              acpi_cmbat_init_battery(void *);
 138
 139 static __inline int
 140 acpi_cmbat_info_expired(struct timespec *lastupdated)
 141 {
 142         struct timespec curtime;
 143
 144         if (lastupdated == NULL) {
 145                 return (1);
 146         }
 147
 148         if (!timespecisset(lastupdated)) {
 149                 return (1);
 150         }
 151
 152         getnanotime(&curtime);
 153         timespecsub(&curtime, lastupdated);
 154         return ((curtime.tv_sec < 0 || curtime.tv_sec > acpi_battery_get_info_expire()));
 155 }
 156
 157
 158 static __inline void
 159 acpi_cmbat_info_updated(struct timespec *lastupdated)
 160 {
 161
 162         if (lastupdated != NULL) {
 163                 getnanotime(lastupdated);
 164         }
 165 }
 166
 167 static void
 168 acpi_cmbat_get_bst(void *context)
 169 {
 170         device_t        dev;
 171         struct acpi_cmbat_softc *sc;
 172         ACPI_STATUS     as;
 173         ACPI_OBJECT     *res, *tmp;
 174         ACPI_HANDLE     h;
 175         ACPI_BUFFER     bst_buffer;
 176
 177         dev = context;
 178         sc = device_get_softc(dev);
 179         h = acpi_get_handle(dev);
 180         bst_buffer.Pointer = NULL;
 181
 182         if (!acpi_cmbat_info_expired(&sc->bst_lastupdated)) {
 183                 return;
 184         }
 185
 186         if (sc->bst_updating) {
 187                 return;
 188         }
 189         sc->bst_updating = 1;
 190
 191         bst_buffer.Length = ACPI_ALLOCATE_BUFFER;
 192         if (ACPI_FAILURE(as = AcpiEvaluateObject(h, "_BST", NULL, &bst_buffer))) {
 193                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
 194                     "error fetching current battery status -- %s\n",
 195                     AcpiFormatException(as));
 196                 goto end;
 197         }
 198
 199         res = (ACPI_OBJECT *)bst_buffer.Pointer;
 200
 201         if ((res == NULL) || (res->Type != ACPI_TYPE_PACKAGE) || (res->Package.Count != 4)) {
 202                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
 203                     "battery status corrupted\n");
 204                 goto end;
 205         }
 206
 207         PKG_GETINT(res, tmp, 0, sc->bst.state, end);
 208         PKG_GETINT(res, tmp, 1, sc->bst.rate, end);
 209         PKG_GETINT(res, tmp, 2, sc->bst.cap, end);
 210         PKG_GETINT(res, tmp, 3, sc->bst.volt, end);
 211         acpi_cmbat_info_updated(&sc->bst_lastupdated);
 212 end:
 213         if (bst_buffer.Pointer != NULL)
 214                 AcpiOsFree(bst_buffer.Pointer);
 215         sc->bst_updating = 0;
 216 }
 217
 218 static void
 219 acpi_cmbat_get_bif(void *context)
 220 {
 221         device_t        dev;
 222         struct acpi_cmbat_softc *sc;
 223         ACPI_STATUS     as;
 224         ACPI_OBJECT     *res, *tmp;
 225         ACPI_HANDLE     h;
 226         ACPI_BUFFER     bif_buffer;
 227
 228         dev = context;
 229         sc = device_get_softc(dev);
 230         h = acpi_get_handle(dev);
 231         bif_buffer.Pointer = NULL;
 232
 233         if (!acpi_cmbat_info_expired(&sc->bif_lastupdated)) {
 234                 return;
 235         }
 236
 237         if (sc->bif_updating) {
 238                 return;
 239         }
 240         sc->bif_updating = 1;
 241
 242         bif_buffer.Length = ACPI_ALLOCATE_BUFFER;
 243         if (ACPI_FAILURE(as = AcpiEvaluateObject(h, "_BIF", NULL, &bif_buffer))) {
 244                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
 245                     "error fetching current battery info -- %s\n",
 246                     AcpiFormatException(as));
 247                 goto end;
 248         }
 249
 250         res = (ACPI_OBJECT *)bif_buffer.Pointer;
 251
 252         if ((res == NULL) || (res->Type != ACPI_TYPE_PACKAGE) || (res->Package.Count != 13)) {
 253                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
 254                     "battery info corrupted\n");
 255                 goto end;
 256         }
 257
 258         PKG_GETINT(res, tmp,  0, sc->bif.unit, end);
 259         PKG_GETINT(res, tmp,  1, sc->bif.dcap, end);
 260         PKG_GETINT(res, tmp,  2, sc->bif.lfcap, end);
 261         PKG_GETINT(res, tmp,  3, sc->bif.btech, end);
 262         PKG_GETINT(res, tmp,  4, sc->bif.dvol, end);
 263         PKG_GETINT(res, tmp,  5, sc->bif.wcap, end);
 264         PKG_GETINT(res, tmp,  6, sc->bif.lcap, end);
 265         PKG_GETINT(res, tmp,  7, sc->bif.gra1, end);
 266         PKG_GETINT(res, tmp,  8, sc->bif.gra2, end);
 267         PKG_GETSTR(res, tmp,  9, sc->bif.model, ACPI_CMBAT_MAXSTRLEN, end);
 268         PKG_GETSTR(res, tmp, 10, sc->bif.serial, ACPI_CMBAT_MAXSTRLEN, end);
 269         PKG_GETSTR(res, tmp, 11, sc->bif.type, ACPI_CMBAT_MAXSTRLEN, end);
 270         PKG_GETSTR(res, tmp, 12, sc->bif.oeminfo, ACPI_CMBAT_MAXSTRLEN, end);
 271         acpi_cmbat_info_updated(&sc->bif_lastupdated);
 272 end:
 273         if (bif_buffer.Pointer != NULL)
 274                 AcpiOsFree(bif_buffer.Pointer);
 275         sc->bif_updating = 0;
 276 }
 277
 278 static void
 279 acpi_cmbat_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context)
 280 {
 281         device_t        dev;
 282         struct acpi_cmbat_softc *sc;
 283
 284         dev = (device_t)context;
 285         if ((sc = device_get_softc(dev)) == NULL) {
 286                 return;
 287         }
 288
 289         switch (notify) {
 290         case ACPI_BATTERY_BST_CHANGE:
 291                 timespecclear(&sc->bst_lastupdated);
 292                 break;
 293         case ACPI_BATTERY_BIF_CHANGE:
 294                 timespecclear(&sc->bif_lastupdated);
 295                 AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cmbat_get_bif, dev);
 296                 break;
 297         default:
 298                 break;
 299         }
 300 }
 301
 302 static int
 303 acpi_cmbat_probe(device_t dev)
 304 {
 305
 306         if ((acpi_get_type(dev) == ACPI_TYPE_DEVICE) &&
 307             !acpi_disabled("cmbat") &&
 308             acpi_MatchHid(dev, "PNP0C0A")) {
 309                 /*
 310                  * Set device description.
 311                  */
 312                 device_set_desc(dev, "Control method Battery");
 313                 return (0);
 314         }
 315         return (ENXIO);
 316 }
 317
 318 static int
 319 acpi_cmbat_attach(device_t dev)
 320 {
 321         int             error;
 322         ACPI_HANDLE     handle;
 323         struct acpi_cmbat_softc *sc;
 324
 325         if ((sc = device_get_softc(dev)) == NULL) {
 326                 return (ENXIO);
 327         }
 328
 329         handle = acpi_get_handle(dev);
 330
 331         AcpiInstallNotifyHandler(handle, ACPI_DEVICE_NOTIFY,
 332                                  acpi_cmbat_notify_handler, dev);
 333
 334         sc->bif_updating = sc->bst_updating = 0;
 335         sc->dev = dev;
 336
 337         timespecclear(&sc->bif_lastupdated);
 338         timespecclear(&sc->bst_lastupdated);
 339
 340         if (acpi_cmbat_units == 0) {
 341                 if ((error = acpi_register_ioctl(ACPIIO_CMBAT_GET_BIF,
 342                                 acpi_cmbat_ioctl, NULL)) != 0) {
 343                         return (error);
 344                 }
 345                 if ((error = acpi_register_ioctl(ACPIIO_CMBAT_GET_BST,
 346                                 acpi_cmbat_ioctl, NULL)) != 0) {
 347                         return (error);
 348                 }
 349         }
 350
 351         if ((error = acpi_battery_register(ACPI_BATT_TYPE_CMBAT,
 352                         acpi_cmbat_units)) != 0) {
 353                 return (error);
 354         }
 355
 356         acpi_cmbat_units++;
 357         timespecclear(&acpi_cmbat_info_lastupdated);
 358         sc->initializing = 0;
 359
 360         AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cmbat_init_battery, dev);
 361         return (0);
 362 }
 363
 364 static int
 365 acpi_cmbat_resume(device_t dev)
 366 {
 367
 368         AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cmbat_init_battery, dev);
 369         return (0);
 370 }
 371
 372 static device_method_t acpi_cmbat_methods[] = {
 373         /* Device interface */
 374         DEVMETHOD(device_probe,         acpi_cmbat_probe),
 375         DEVMETHOD(device_attach,        acpi_cmbat_attach),
 376         DEVMETHOD(device_resume,        acpi_cmbat_resume),
 377
 378         {0, 0}
 379 };
 380
 381 static driver_t acpi_cmbat_driver = {
 382         "acpi_cmbat",
 383         acpi_cmbat_methods,
 384         sizeof(struct acpi_cmbat_softc),
 385 };
 386
 387 static devclass_t acpi_cmbat_devclass;
 388 DRIVER_MODULE(acpi_cmbat, acpi, acpi_cmbat_driver, acpi_cmbat_devclass, 0, 0);
 389
 390 static int
 391 acpi_cmbat_ioctl(u_long cmd, caddr_t addr, void *arg)
 392 {
 393         device_t        dev;
 394         union acpi_battery_ioctl_arg *ioctl_arg;
 395         struct acpi_cmbat_softc *sc;
 396         struct acpi_bif *bifp;
 397         struct acpi_bst *bstp;
 398
 399         ioctl_arg = (union acpi_battery_ioctl_arg *)addr;
 400         if ((dev = devclass_get_device(acpi_cmbat_devclass,
 401                         ioctl_arg->unit)) == NULL) {
 402                 return (ENXIO);
 403         }
 404
 405         if ((sc = device_get_softc(dev)) == NULL) {
 406                 return (ENXIO);
 407         }
 408
 409         /*
 410          * No security check required: information retrieval only.  If
 411          * new functions are added here, a check might be required.
 412          */
 413
 414         switch (cmd) {
 415         case ACPIIO_CMBAT_GET_BIF:
 416                 acpi_cmbat_get_bif(dev);
 417                 bifp = &ioctl_arg->bif;
 418                 bifp->unit = sc->bif.unit;
 419                 bifp->dcap = sc->bif.dcap;
 420                 bifp->lfcap = sc->bif.lfcap;
 421                 bifp->btech = sc->bif.btech;
 422                 bifp->dvol = sc->bif.dvol;
 423                 bifp->wcap = sc->bif.wcap;
 424                 bifp->lcap = sc->bif.lcap;
 425                 bifp->gra1 = sc->bif.gra1;
 426                 bifp->gra2 = sc->bif.gra2;
 427                 strncpy(bifp->model, sc->bif.model, sizeof(sc->bif.model));
 428                 strncpy(bifp->serial, sc->bif.serial, sizeof(sc->bif.serial));
 429                 strncpy(bifp->type, sc->bif.type, sizeof(sc->bif.type));
 430                 strncpy(bifp->oeminfo, sc->bif.oeminfo, sizeof(sc->bif.oeminfo));
 431                 break;
 432
 433         case ACPIIO_CMBAT_GET_BST:
 434                 bstp = &ioctl_arg->bst;
 435                 if (acpi_BatteryIsPresent(dev)) {
 436                         acpi_cmbat_get_bst(dev);
 437                         bstp->state = sc->bst.state;
 438                         bstp->rate = sc->bst.rate;
 439                         bstp->cap = sc->bst.cap;
 440                         bstp->volt = sc->bst.volt;
 441                 } else
 442                         bstp->state = ACPI_BATT_STAT_NOT_PRESENT;
 443                 break;
 444         }
 445
 446         return (0);
 447 }
 448
 449 static __inline int
 450 acpi_cmbat_is_bst_valid(struct acpi_bst *bst)
 451 {
 452         if (bst->state >= ACPI_BATT_STAT_MAX ||
 453             bst->cap == 0xffffffff ||
 454             bst->volt == 0xffffffff) {
 455                 return (0);
 456         }
 457
 458         return (1);
 459 }
 460
 461 static __inline int
 462 acpi_cmbat_is_bif_valid(struct acpi_bif *bif)
 463 {
 464         if (bif->lfcap == 0) {
 465                 return (0);
 466         }
 467
 468         return (1);
 469 }
 470
 471 static int
 472 acpi_cmbat_get_total_battinfo(struct acpi_battinfo *battinfo)
 473 {
 474         int             i;
 475         int             error;
 476         int             batt_stat;
 477         int             valid_rate, valid_units;
 478         int             cap, min;
 479         int             total_cap, total_min, total_full;
 480         device_t        dev;
 481         struct acpi_cmbat_softc *sc;
 482         static int      bat_units = 0;
 483         static struct acpi_cmbat_softc **bat = NULL;
 484
 485         cap = min = -1;
 486         batt_stat = ACPI_BATT_STAT_NOT_PRESENT;
 487         error = 0;
 488
 489         /* Allocate array of softc pointers */
 490         if (bat_units != acpi_cmbat_units) {
 491                 if (bat != NULL) {
 492                         free(bat, M_ACPICMBAT);
 493                         bat = NULL;
 494                 }
 495                 bat_units = 0;
 496         }
 497         if (bat == NULL) {
 498                 bat_units = acpi_cmbat_units;
 499                 bat = malloc(sizeof(struct acpi_cmbat_softc *) * bat_units,
 500                              M_ACPICMBAT, M_INTWAIT);
 501
 502                 /* Collect softc pointers */
 503                 for (i = 0; i < acpi_cmbat_units; i++) {
 504                         if ((dev = devclass_get_device(acpi_cmbat_devclass, i)) == NULL) {
 505                                 error = ENXIO;
 506                                 goto out;
 507                         }
 508
 509                         if ((sc = device_get_softc(dev)) == NULL) {
 510                                 error = ENXIO;
 511                                 goto out;
 512                         }
 513
 514                         bat[i] = sc;
 515                 }
 516         }
 517
 518         /* Get battery status, valid rate and valid units */
 519         batt_stat = valid_rate = valid_units = 0;
 520         for (i = 0; i < acpi_cmbat_units; i++) {
 521                 bat[i]->present = acpi_BatteryIsPresent(bat[i]->dev);
 522                 if (!bat[i]->present)
 523                         continue;
 524
 525                 acpi_cmbat_get_bst(bat[i]->dev);
 526
 527                 /* If battey not installed, we get strange values */
 528                 if (!acpi_cmbat_is_bst_valid(&(bat[i]->bst)) ||
 529                     !acpi_cmbat_is_bif_valid(&(bat[i]->bif))) {
 530                         bat[i]->present = 0;
 531                         continue;
 532                 }
 533
 534                 valid_units++;
 535
 536                 bat[i]->cap = 100 * bat[i]->bst.cap / bat[i]->bif.lfcap;
 537
 538                 batt_stat |= bat[i]->bst.state;
 539
 540                 if (bat[i]->bst.rate > 0) {
 541                         /*
 542                          * XXX Hack to calculate total battery time.
 543                          * Systems with 2 or more battries, they may get used
 544                          * one by one, thus bst.rate is set only to the one
 545                          * in use. For remaining batteries bst.rate = 0, which
 546                          * makes it impossible to calculate remaining time.
 547                          * Some other systems may need sum of bst.rate in
 548                          * dis-charging state.
 549                          * There for we sum up the bst.rate that is valid
 550                          * (in dis-charging state), and use the sum to
 551                          * calcutate remaining batteries' time.
 552                          */
 553                         if (bat[i]->bst.state & ACPI_BATT_STAT_DISCHARG) {
 554                                 valid_rate += bat[i]->bst.rate;
 555                         }
 556                 }
 557         }
 558
 559         /* Calculate total battery capacity and time */
 560         total_cap = total_min = total_full = 0;
 561         for (i = 0; i < acpi_cmbat_units; i++) {
 562                 if (!bat[i]->present) {
 563                         continue;
 564                 }
 565
 566                 if (valid_rate > 0) {
 567                         /* Use the sum of bst.rate */
 568                         bat[i]->min = 60 * bat[i]->bst.cap / valid_rate;
 569                 } else if (bat[i]->full_charge_time > 0) {
 570                         bat[i]->min = (bat[i]->full_charge_time * bat[i]->cap) / 100;
 571                 } else {
 572                         /* Couldn't find valid rate and full battery time */
 573                         bat[i]->min = 0;
 574                 }
 575                 total_min += bat[i]->min;
 576                 total_cap += bat[i]->cap;
 577                 total_full += bat[i]->full_charge_time;
 578         }
 579
 580         /* Battery life */
 581         if (valid_units == 0) {
 582                 cap = -1;
 583                 batt_stat = ACPI_BATT_STAT_NOT_PRESENT;
 584         } else {
 585                 cap = total_cap / valid_units;
 586         }
 587
 588         /* Battery time */
 589         if (valid_units == 0) {
 590                 min = -1;
 591         } else if (valid_rate == 0 || (batt_stat & ACPI_BATT_STAT_CHARGING)) {
 592                 if (total_full == 0) {
 593                         min = -1;
 594                 } else {
 595                         min = (total_full * cap) / 100;
 596                 }
 597         } else {
 598                 min = total_min;
 599         }
 600
 601         acpi_cmbat_info_updated(&acpi_cmbat_info_lastupdated);
 602 out:
 603         battinfo->cap = cap;
 604         battinfo->min = min;
 605         battinfo->state = batt_stat;
 606
 607         return (error);
 608 }
 609
 610 static void
 611 acpi_cmbat_init_battery(void *arg)
 612 {
 613         int             retry;
 614         device_t        dev = (device_t)arg;
 615         struct acpi_cmbat_softc *sc = device_get_softc(dev);
 616 #define ACPI_CMBAT_RETRY_MAX    6
 617
 618         if (sc->initializing) {
 619                 return;
 620         }
 621
 622         sc->initializing = 1;
 623
 624         ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
 625                     "battery initialization start\n");
 626
 627         for (retry = 0; retry < ACPI_CMBAT_RETRY_MAX; retry++, AcpiOsSleep(10, 0)) {
 628                 sc->present = acpi_BatteryIsPresent(dev);
 629                 if (!sc->present) {
 630                         continue;
 631                 }
 632
 633                 timespecclear(&sc->bst_lastupdated);
 634                 timespecclear(&sc->bif_lastupdated);
 635
 636                 acpi_cmbat_get_bst(dev);
 637
 638                 if (!acpi_cmbat_is_bst_valid(&sc->bst)) {
 639                         continue;
 640                 }
 641
 642                 acpi_cmbat_get_bif(dev);
 643
 644                 if (!acpi_cmbat_is_bif_valid(&sc->bif)) {
 645                         continue;
 646                 }
 647
 648                 break;
 649         }
 650
 651         if (retry == ACPI_CMBAT_RETRY_MAX)
 652                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
 653                             "battery initialization failed, giving up\n");
 654         else
 655                 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev),
 656                             "battery initialization done, tried %d times\n",
 657                             retry+1);
 658
 659         sc->initializing = 0;
 660 }
 661
 662 /*
 663  * Public interfaces.
 664  */
 665
 666 int
 667 acpi_cmbat_get_battinfo(int unit, struct acpi_battinfo *battinfo)
 668 {
 669         int             error;
 670         device_t        dev;
 671         struct acpi_cmbat_softc *sc;
 672
 673         if (unit == -1) {
 674                 return (acpi_cmbat_get_total_battinfo(battinfo));
 675         }
 676
 677         if (acpi_cmbat_info_expired(&acpi_cmbat_info_lastupdated)) {
 678                 error = acpi_cmbat_get_total_battinfo(battinfo);
 679                 if (error) {
 680                         goto out;
 681                 }
 682         }
 683
 684         error = 0;
 685         if (unit >= acpi_cmbat_units) {
 686                 error = ENXIO;
 687                 goto out;
 688         }
 689
 690         if ((dev = devclass_get_device(acpi_cmbat_devclass, unit)) == NULL) {
 691                 error = ENXIO;
 692                 goto out;
 693         }
 694
 695         if ((sc = device_get_softc(dev)) == NULL) {
 696                 error = ENXIO;
 697                 goto out;
 698         }
 699
 700         if (!sc->present) {
 701                 battinfo->cap = -1;
 702                 battinfo->min = -1;
 703                 battinfo->state = ACPI_BATT_STAT_NOT_PRESENT;
 704         } else {
 705                 battinfo->cap = sc->cap;
 706                 battinfo->min = sc->min;
 707                 battinfo->state = sc->bst.state;
 708         }
 709 out:
 710         return (error);
 711 }
 712