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 * $FreeBSD$ 29 */ 30 31 #include "opt_acpi.h" 32 #include <sys/param.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/bus.h> 36 #include <sys/ioccom.h> 37 38 #include <machine/bus.h> 39 #include <sys/rman.h> 40 #include <sys/malloc.h> 41 42 #include "acpi.h" 43 #include <dev/acpica/acpivar.h> 44 #include <dev/acpica/acpiio.h> 45 46 MALLOC_DEFINE(M_ACPICMBAT, "acpicmbat", "ACPI control method battery data"); 47 48 /* Number of times to retry initialization before giving up. */ 49 #define ACPI_CMBAT_RETRY_MAX 6 50 51 /* Check the battery once a minute. */ 52 #define CMBAT_POLLRATE (60 * hz) 53 54 /* Hooks for the ACPI CA debugging infrastructure */ 55 #define _COMPONENT ACPI_BATTERY 56 ACPI_MODULE_NAME("BATTERY") 57 58 #define ACPI_BATTERY_BST_CHANGE 0x80 59 #define ACPI_BATTERY_BIF_CHANGE 0x81 60 61 struct acpi_cmbat_softc { 62 device_t dev; 63 64 struct acpi_bif bif; 65 struct acpi_bst bst; 66 struct timespec bif_lastupdated; 67 struct timespec bst_lastupdated; 68 int bif_updating; 69 int bst_updating; 70 71 int present; 72 int cap; 73 int min; 74 int full_charge_time; 75 int initializing; 76 int phys_unit; 77 }; 78 79 static struct timespec acpi_cmbat_info_lastupdated; 80 81 /* XXX: devclass_get_maxunit() don't give us the current allocated units. */ 82 static int acpi_cmbat_units = 0; 83 84 static int acpi_cmbat_info_expired(struct timespec *); 85 static void acpi_cmbat_info_updated(struct timespec *); 86 static void acpi_cmbat_get_bst(void *); 87 static void acpi_cmbat_get_bif(void *); 88 static void acpi_cmbat_notify_handler(ACPI_HANDLE, UINT32, void *); 89 static int acpi_cmbat_probe(device_t); 90 static int acpi_cmbat_attach(device_t); 91 static int acpi_cmbat_detach(device_t); 92 static int acpi_cmbat_resume(device_t); 93 static int acpi_cmbat_ioctl(u_long, caddr_t, void *); 94 static int acpi_cmbat_is_bst_valid(struct acpi_bst*); 95 static int acpi_cmbat_is_bif_valid(struct acpi_bif*); 96 static int acpi_cmbat_get_total_battinfo(struct acpi_battinfo *); 97 static void acpi_cmbat_init_battery(void *); 98 99 static device_method_t acpi_cmbat_methods[] = { 100 /* Device interface */ 101 DEVMETHOD(device_probe, acpi_cmbat_probe), 102 DEVMETHOD(device_attach, acpi_cmbat_attach), 103 DEVMETHOD(device_detach, acpi_cmbat_detach), 104 DEVMETHOD(device_resume, acpi_cmbat_resume), 105 106 {0, 0} 107 }; 108 109 static driver_t acpi_cmbat_driver = { 110 "acpi_cmbat", 111 acpi_cmbat_methods, 112 sizeof(struct acpi_cmbat_softc), 113 }; 114 115 static devclass_t acpi_cmbat_devclass; 116 DRIVER_MODULE(acpi_cmbat, acpi, acpi_cmbat_driver, acpi_cmbat_devclass, 0, 0); 117 MODULE_DEPEND(acpi_cmbat, acpi, 1, 1, 1); 118 119 static int 120 acpi_cmbat_info_expired(struct timespec *lastupdated) 121 { 122 struct timespec curtime; 123 124 if (lastupdated == NULL) 125 return (1); 126 if (!timespecisset(lastupdated)) 127 return (1); 128 129 getnanotime(&curtime); 130 timespecsub(&curtime, lastupdated); 131 return (curtime.tv_sec < 0 || 132 curtime.tv_sec > acpi_battery_get_info_expire()); 133 } 134 135 136 static void 137 acpi_cmbat_info_updated(struct timespec *lastupdated) 138 { 139 if (lastupdated != NULL) 140 getnanotime(lastupdated); 141 } 142 143 static void 144 acpi_cmbat_get_bst(void *context) 145 { 146 device_t dev; 147 struct acpi_cmbat_softc *sc; 148 ACPI_STATUS as; 149 ACPI_OBJECT *res; 150 ACPI_HANDLE h; 151 ACPI_BUFFER bst_buffer; 152 153 dev = context; 154 sc = device_get_softc(dev); 155 h = acpi_get_handle(dev); 156 157 if (!acpi_cmbat_info_expired(&sc->bst_lastupdated)) 158 return; 159 if (sc->bst_updating) 160 return; 161 sc->bst_updating = 1; 162 163 bst_buffer.Pointer = NULL; 164 bst_buffer.Length = ACPI_ALLOCATE_BUFFER; 165 as = AcpiEvaluateObject(h, "_BST", NULL, &bst_buffer); 166 if (ACPI_FAILURE(as)) { 167 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev), 168 "error fetching current battery status -- %s\n", 169 AcpiFormatException(as)); 170 goto end; 171 } 172 173 res = (ACPI_OBJECT *)bst_buffer.Pointer; 174 if (!ACPI_PKG_VALID(res, 4)) { 175 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev), 176 "battery status corrupted\n"); 177 goto end; 178 } 179 180 if (acpi_PkgInt32(res, 0, &sc->bst.state) != 0) 181 goto end; 182 if (acpi_PkgInt32(res, 1, &sc->bst.rate) != 0) 183 goto end; 184 if (acpi_PkgInt32(res, 2, &sc->bst.cap) != 0) 185 goto end; 186 if (acpi_PkgInt32(res, 3, &sc->bst.volt) != 0) 187 goto end; 188 acpi_cmbat_info_updated(&sc->bst_lastupdated); 189 190 end: 191 if (bst_buffer.Pointer != NULL) 192 AcpiOsFree(bst_buffer.Pointer); 193 sc->bst_updating = 0; 194 } 195 196 static void 197 acpi_cmbat_get_bif(void *context) 198 { 199 device_t dev; 200 struct acpi_cmbat_softc *sc; 201 ACPI_STATUS as; 202 ACPI_OBJECT *res; 203 ACPI_HANDLE h; 204 ACPI_BUFFER bif_buffer; 205 206 dev = context; 207 sc = device_get_softc(dev); 208 h = acpi_get_handle(dev); 209 210 if (!acpi_cmbat_info_expired(&sc->bif_lastupdated)) 211 return; 212 if (sc->bif_updating) 213 return; 214 sc->bif_updating = 1; 215 216 bif_buffer.Pointer = NULL; 217 bif_buffer.Length = ACPI_ALLOCATE_BUFFER; 218 as = AcpiEvaluateObject(h, "_BIF", NULL, &bif_buffer); 219 if (ACPI_FAILURE(as)) { 220 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev), 221 "error fetching current battery info -- %s\n", 222 AcpiFormatException(as)); 223 goto end; 224 } 225 226 res = (ACPI_OBJECT *)bif_buffer.Pointer; 227 if (!ACPI_PKG_VALID(res, 13)) { 228 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev), 229 "battery info corrupted\n"); 230 goto end; 231 } 232 233 if (acpi_PkgInt32(res, 0, &sc->bif.units) != 0) 234 goto end; 235 if (acpi_PkgInt32(res, 1, &sc->bif.dcap) != 0) 236 goto end; 237 if (acpi_PkgInt32(res, 2, &sc->bif.lfcap) != 0) 238 goto end; 239 if (acpi_PkgInt32(res, 3, &sc->bif.btech) != 0) 240 goto end; 241 if (acpi_PkgInt32(res, 4, &sc->bif.dvol) != 0) 242 goto end; 243 if (acpi_PkgInt32(res, 5, &sc->bif.wcap) != 0) 244 goto end; 245 if (acpi_PkgInt32(res, 6, &sc->bif.lcap) != 0) 246 goto end; 247 if (acpi_PkgInt32(res, 7, &sc->bif.gra1) != 0) 248 goto end; 249 if (acpi_PkgInt32(res, 8, &sc->bif.gra2) != 0) 250 goto end; 251 if (acpi_PkgStr(res, 9, sc->bif.model, ACPI_CMBAT_MAXSTRLEN) != 0) 252 goto end; 253 if (acpi_PkgStr(res, 10, sc->bif.serial, ACPI_CMBAT_MAXSTRLEN) != 0) 254 goto end; 255 if (acpi_PkgStr(res, 11, sc->bif.type, ACPI_CMBAT_MAXSTRLEN) != 0) 256 goto end; 257 if (acpi_PkgStr(res, 12, sc->bif.oeminfo, ACPI_CMBAT_MAXSTRLEN) != 0) 258 goto end; 259 acpi_cmbat_info_updated(&sc->bif_lastupdated); 260 261 end: 262 if (bif_buffer.Pointer != NULL) 263 AcpiOsFree(bif_buffer.Pointer); 264 sc->bif_updating = 0; 265 } 266 267 static void 268 acpi_cmbat_notify_handler(ACPI_HANDLE h, UINT32 notify, void *context) 269 { 270 device_t dev; 271 struct acpi_cmbat_softc *sc; 272 273 dev = (device_t)context; 274 if ((sc = device_get_softc(dev)) == NULL) 275 return; 276 277 acpi_UserNotify("CMBAT", h, notify); 278 279 switch (notify) { 280 case ACPI_NOTIFY_DEVICE_CHECK: 281 case ACPI_BATTERY_BST_CHANGE: 282 timespecclear(&sc->bst_lastupdated); 283 break; 284 case ACPI_NOTIFY_BUS_CHECK: 285 case ACPI_BATTERY_BIF_CHANGE: 286 timespecclear(&sc->bif_lastupdated); 287 AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cmbat_get_bif, dev); 288 break; 289 default: 290 break; 291 } 292 } 293 294 static int 295 acpi_cmbat_probe(device_t dev) 296 { 297 static char *cmbat_ids[] = { "PNP0C0A", NULL }; 298 299 if (acpi_disabled("cmbat") || 300 ACPI_ID_PROBE(device_get_parent(dev), dev, cmbat_ids) == NULL) 301 return (ENXIO); 302 303 device_set_desc(dev, "Control Method Battery"); 304 return (0); 305 } 306 307 static int 308 acpi_cmbat_attach(device_t dev) 309 { 310 int error; 311 ACPI_HANDLE handle; 312 struct acpi_cmbat_softc *sc; 313 314 if ((sc = device_get_softc(dev)) == NULL) 315 return (ENXIO); 316 317 handle = acpi_get_handle(dev); 318 319 /* 320 * Install a system notify handler in addition to the device notify. 321 * Toshiba notebook uses this alternate notify for its battery. 322 */ 323 AcpiInstallNotifyHandler(handle, ACPI_ALL_NOTIFY, 324 acpi_cmbat_notify_handler, dev); 325 326 sc->bif_updating = sc->bst_updating = 0; 327 sc->dev = dev; 328 329 timespecclear(&sc->bif_lastupdated); 330 timespecclear(&sc->bst_lastupdated); 331 332 if (acpi_cmbat_units == 0) { 333 error = acpi_register_ioctl(ACPIIO_CMBAT_GET_BIF, 334 acpi_cmbat_ioctl, NULL); 335 if (error != 0) 336 return (error); 337 error = acpi_register_ioctl(ACPIIO_CMBAT_GET_BST, 338 acpi_cmbat_ioctl, NULL); 339 if (error != 0) 340 return (error); 341 } 342 343 sc->phys_unit = acpi_cmbat_units; 344 error = acpi_battery_register(ACPI_BATT_TYPE_CMBAT, sc->phys_unit); 345 if (error != 0) 346 return (error); 347 348 acpi_cmbat_units++; 349 timespecclear(&acpi_cmbat_info_lastupdated); 350 sc->initializing = 0; 351 AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cmbat_init_battery, dev); 352 353 return (0); 354 } 355 356 static int 357 acpi_cmbat_detach(device_t dev) 358 { 359 struct acpi_cmbat_softc *sc; 360 361 sc = device_get_softc(dev); 362 acpi_battery_remove(ACPI_BATT_TYPE_CMBAT, sc->phys_unit); 363 acpi_cmbat_units--; 364 return (0); 365 } 366 367 static int 368 acpi_cmbat_resume(device_t dev) 369 { 370 AcpiOsQueueForExecution(OSD_PRIORITY_LO, acpi_cmbat_init_battery, dev); 371 return (0); 372 } 373 374 static int 375 acpi_cmbat_ioctl(u_long cmd, caddr_t addr, void *arg) 376 { 377 device_t dev; 378 union acpi_battery_ioctl_arg *ioctl_arg; 379 struct acpi_cmbat_softc *sc; 380 struct acpi_bif *bifp; 381 struct acpi_bst *bstp; 382 383 ioctl_arg = (union acpi_battery_ioctl_arg *)addr; 384 dev = devclass_get_device(acpi_cmbat_devclass, ioctl_arg->unit); 385 if (dev == NULL) 386 return (ENXIO); 387 sc = device_get_softc(dev); 388 if (sc == NULL) 389 return (ENXIO); 390 391 /* 392 * No security check required: information retrieval only. If 393 * new functions are added here, a check might be required. 394 */ 395 switch (cmd) { 396 case ACPIIO_CMBAT_GET_BIF: 397 acpi_cmbat_get_bif(dev); 398 bifp = &ioctl_arg->bif; 399 bifp->units = sc->bif.units; 400 bifp->dcap = sc->bif.dcap; 401 bifp->lfcap = sc->bif.lfcap; 402 bifp->btech = sc->bif.btech; 403 bifp->dvol = sc->bif.dvol; 404 bifp->wcap = sc->bif.wcap; 405 bifp->lcap = sc->bif.lcap; 406 bifp->gra1 = sc->bif.gra1; 407 bifp->gra2 = sc->bif.gra2; 408 strncpy(bifp->model, sc->bif.model, sizeof(sc->bif.model)); 409 strncpy(bifp->serial, sc->bif.serial, sizeof(sc->bif.serial)); 410 strncpy(bifp->type, sc->bif.type, sizeof(sc->bif.type)); 411 strncpy(bifp->oeminfo, sc->bif.oeminfo, sizeof(sc->bif.oeminfo)); 412 break; 413 case ACPIIO_CMBAT_GET_BST: 414 bstp = &ioctl_arg->bst; 415 if (acpi_BatteryIsPresent(dev)) { 416 acpi_cmbat_get_bst(dev); 417 bstp->state = sc->bst.state; 418 bstp->rate = sc->bst.rate; 419 bstp->cap = sc->bst.cap; 420 bstp->volt = sc->bst.volt; 421 } else { 422 bstp->state = ACPI_BATT_STAT_NOT_PRESENT; 423 } 424 break; 425 default: 426 break; 427 } 428 429 return (0); 430 } 431 432 static int 433 acpi_cmbat_is_bst_valid(struct acpi_bst *bst) 434 { 435 if (bst->state >= ACPI_BATT_STAT_MAX || bst->cap == 0xffffffff || 436 bst->volt == 0xffffffff) 437 438 return (0); 439 else 440 return (1); 441 } 442 443 static int 444 acpi_cmbat_is_bif_valid(struct acpi_bif *bif) 445 { 446 if (bif->lfcap == 0) 447 return (0); 448 else 449 return (1); 450 } 451 452 static int 453 acpi_cmbat_get_total_battinfo(struct acpi_battinfo *battinfo) 454 { 455 int i; 456 int error; 457 int batt_stat; 458 int valid_rate, valid_units; 459 int cap, min; 460 int total_cap, total_min, total_full; 461 device_t dev; 462 struct acpi_cmbat_softc *sc; 463 static int bat_units = 0; 464 static struct acpi_cmbat_softc **bat = NULL; 465 466 cap = min = -1; 467 batt_stat = ACPI_BATT_STAT_NOT_PRESENT; 468 error = 0; 469 470 /* Allocate array of softc pointers */ 471 if (bat_units != acpi_cmbat_units) { 472 if (bat != NULL) { 473 free(bat, M_ACPICMBAT); 474 bat = NULL; 475 } 476 bat_units = 0; 477 } 478 if (bat == NULL) { 479 bat_units = acpi_cmbat_units; 480 bat = malloc(sizeof(struct acpi_cmbat_softc *) * bat_units, 481 M_ACPICMBAT, M_NOWAIT); 482 if (bat == NULL) { 483 error = ENOMEM; 484 goto out; 485 } 486 487 /* Collect softc pointers */ 488 for (i = 0; i < acpi_cmbat_units; i++) { 489 if ((dev = devclass_get_device(acpi_cmbat_devclass, i)) == NULL) { 490 error = ENXIO; 491 goto out; 492 } 493 if ((sc = device_get_softc(dev)) == NULL) { 494 error = ENXIO; 495 goto out; 496 } 497 bat[i] = sc; 498 } 499 } 500 501 /* Get battery status, valid rate and valid units */ 502 batt_stat = valid_rate = valid_units = 0; 503 for (i = 0; i < acpi_cmbat_units; i++) { 504 bat[i]->present = acpi_BatteryIsPresent(bat[i]->dev); 505 if (!bat[i]->present) 506 continue; 507 508 acpi_cmbat_get_bst(bat[i]->dev); 509 510 /* If battery not installed, we get strange values */ 511 if (!acpi_cmbat_is_bst_valid(&(bat[i]->bst)) || 512 !acpi_cmbat_is_bif_valid(&(bat[i]->bif))) { 513 514 bat[i]->present = 0; 515 continue; 516 } 517 518 valid_units++; 519 bat[i]->cap = 100 * bat[i]->bst.cap / bat[i]->bif.lfcap; 520 521 /* 522 * Some laptops report the "design-capacity" instead of the 523 * "real-capacity" when the battery is fully charged. 524 * That breaks the above arithmetic as it needs to be 100% maximum. 525 */ 526 if (bat[i]->cap > 100) 527 bat[i]->cap = 100; 528 529 batt_stat |= bat[i]->bst.state; 530 531 if (bat[i]->bst.rate > 0) { 532 /* 533 * XXX Hack to calculate total battery time. 534 * Systems with 2 or more battries, they may get used 535 * one by one, thus bst.rate is set only to the one 536 * in use. For remaining batteries bst.rate = 0, which 537 * makes it impossible to calculate remaining time. 538 * Some other systems may need sum of bst.rate in 539 * dis-charging state. 540 * There for we sum up the bst.rate that is valid 541 * (in dis-charging state), and use the sum to 542 * calcutate remaining batteries' time. 543 */ 544 if (bat[i]->bst.state & ACPI_BATT_STAT_DISCHARG) 545 valid_rate += bat[i]->bst.rate; 546 } 547 } 548 549 /* Calculate total battery capacity and time */ 550 total_cap = total_min = total_full = 0; 551 for (i = 0; i < acpi_cmbat_units; i++) { 552 if (!bat[i]->present) 553 continue; 554 555 if (valid_rate > 0) { 556 /* Use the sum of bst.rate */ 557 bat[i]->min = 60 * bat[i]->bst.cap / valid_rate; 558 } else if (bat[i]->full_charge_time > 0) { 559 bat[i]->min = (bat[i]->full_charge_time * bat[i]->cap) / 100; 560 } else { 561 /* Couldn't find valid rate and full battery time */ 562 bat[i]->min = 0; 563 } 564 total_min += bat[i]->min; 565 total_cap += bat[i]->cap; 566 total_full += bat[i]->full_charge_time; 567 } 568 569 /* Battery life */ 570 if (valid_units == 0) { 571 cap = -1; 572 batt_stat = ACPI_BATT_STAT_NOT_PRESENT; 573 } else { 574 cap = total_cap / valid_units; 575 } 576 577 /* Battery time */ 578 if (valid_units == 0) { 579 min = -1; 580 } else if (valid_rate == 0 || (batt_stat & ACPI_BATT_STAT_CHARGING)) { 581 if (total_full == 0) 582 min = -1; 583 else 584 min = (total_full * cap) / 100; 585 } else { 586 min = total_min; 587 } 588 acpi_cmbat_info_updated(&acpi_cmbat_info_lastupdated); 589 590 out: 591 battinfo->cap = cap; 592 battinfo->min = min; 593 battinfo->state = batt_stat; 594 595 return (error); 596 } 597 598 static void 599 acpi_cmbat_init_battery(void *arg) 600 { 601 int retry; 602 device_t dev = (device_t)arg; 603 struct acpi_cmbat_softc *sc = device_get_softc(dev); 604 605 if (sc->initializing) 606 return; 607 608 sc->initializing = 1; 609 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev), 610 "battery initialization start\n"); 611 612 for (retry = 0; retry < ACPI_CMBAT_RETRY_MAX; retry++, AcpiOsSleep(10, 0)) { 613 sc->present = acpi_BatteryIsPresent(dev); 614 if (!sc->present) 615 continue; 616 617 timespecclear(&sc->bst_lastupdated); 618 timespecclear(&sc->bif_lastupdated); 619 620 acpi_cmbat_get_bst(dev); 621 if (!acpi_cmbat_is_bst_valid(&sc->bst)) 622 continue; 623 624 acpi_cmbat_get_bif(dev); 625 if (!acpi_cmbat_is_bif_valid(&sc->bif)) 626 continue; 627 break; 628 } 629 630 sc->initializing = 0; 631 if (retry == ACPI_CMBAT_RETRY_MAX) { 632 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev), 633 "battery initialization failed, giving up\n"); 634 } else { 635 ACPI_VPRINT(dev, acpi_device_get_parent_softc(dev), 636 "battery initialization done, tried %d times\n", retry + 1); 637 } 638 } 639 640 /* 641 * Public interfaces. 642 */ 643 int 644 acpi_cmbat_get_battinfo(int unit, struct acpi_battinfo *battinfo) 645 { 646 int error; 647 device_t dev; 648 struct acpi_cmbat_softc *sc; 649 650 if (unit == -1) 651 return (acpi_cmbat_get_total_battinfo(battinfo)); 652 653 if (acpi_cmbat_info_expired(&acpi_cmbat_info_lastupdated)) { 654 error = acpi_cmbat_get_total_battinfo(battinfo); 655 if (error) 656 goto out; 657 } 658 659 error = 0; 660 if (unit >= acpi_cmbat_units) { 661 error = ENXIO; 662 goto out; 663 } 664 665 if ((dev = devclass_get_device(acpi_cmbat_devclass, unit)) == NULL) { 666 error = ENXIO; 667 goto out; 668 } 669 if ((sc = device_get_softc(dev)) == NULL) { 670 error = ENXIO; 671 goto out; 672 } 673 674 if (!sc->present) { 675 battinfo->cap = -1; 676 battinfo->min = -1; 677 battinfo->state = ACPI_BATT_STAT_NOT_PRESENT; 678 } else { 679 battinfo->cap = sc->cap; 680 battinfo->min = sc->min; 681 battinfo->state = sc->bst.state; 682 } 683 684 out: 685 return (error); 686 } 687