sys/dev/acpica5/acpi_battery.c

   1 /*-
   2  * Copyright (c) 2005 Nate Lawson
   3  * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  *
  27  * $FreeBSD: src/sys/dev/acpica/acpi_battery.c,v 1.26 2007/11/20 18:35:36 jkim Exp $
  28  * $DragonFly: src/sys/dev/acpica5/acpi_battery.c,v 1.4 2008/09/29 06:59:45 hasso Exp $
  29  */
  30
  31 #include "opt_acpi.h"
  32 #include <sys/param.h>
  33 #include <sys/kernel.h>
  34 #include <sys/malloc.h>
  35 #include <sys/bus.h>
  36 #include <sys/sysctl.h>
  37 #include <sys/thread2.h>
  38
  39 #include "acpi.h"
  40 #include <dev/acpica5/acpivar.h>
  41 #include <dev/acpica5/acpiio.h>
  42
  43 /* Default seconds before re-sampling the battery state. */
  44 #define ACPI_BATTERY_INFO_EXPIRE        5
  45
  46 static int      acpi_batteries_initted;
  47 static int      acpi_battery_info_expire = ACPI_BATTERY_INFO_EXPIRE;
  48 static struct   acpi_battinfo   acpi_battery_battinfo;
  49 static struct   sysctl_ctx_list acpi_battery_sysctl_ctx;
  50 static struct   sysctl_oid      *acpi_battery_sysctl_tree;
  51
  52 static void acpi_reset_battinfo(struct acpi_battinfo *info);
  53 static void acpi_battery_clean_str(char *str, int len);
  54 static device_t acpi_battery_find_dev(u_int logical_unit);
  55 static int acpi_battery_ioctl(u_long cmd, caddr_t addr, void *arg);
  56 static int acpi_battery_sysctl(SYSCTL_HANDLER_ARGS);
  57 static int acpi_battery_units_sysctl(SYSCTL_HANDLER_ARGS);
  58 static int acpi_battery_init(void);
  59
  60 int
  61 acpi_battery_register(device_t dev)
  62 {
  63     int error;
  64
  65     error = 0;
  66     crit_enter();
  67     if (!acpi_batteries_initted)
  68         error = acpi_battery_init();
  69     crit_exit();
  70     return (error);
  71 }
  72
  73 int
  74 acpi_battery_remove(device_t dev)
  75 {
  76     return (0);
  77 }
  78
  79 int
  80 acpi_battery_get_units(void)
  81 {
  82     devclass_t batt_dc;
  83
  84     batt_dc = devclass_find("battery");
  85     if (batt_dc == NULL)
  86         return (0);
  87     return (devclass_get_count(batt_dc));
  88 }
  89
  90 int
  91 acpi_battery_get_info_expire(void)
  92 {
  93     return (acpi_battery_info_expire);
  94 }
  95
  96 /* Check _BST results for validity. */
  97 int
  98 acpi_battery_bst_valid(struct acpi_bst *bst)
  99 {
 100     return (bst->state < ACPI_BATT_STAT_MAX && bst->cap != ACPI_BATT_UNKNOWN &&
 101         bst->volt != ACPI_BATT_UNKNOWN);
 102 }
 103
 104 /* Check _BIF results for validity. */
 105 int
 106 acpi_battery_bif_valid(struct acpi_bif *bif)
 107 {
 108     return (bif->lfcap != 0);
 109 }
 110
 111 /* Get info about one or all batteries. */
 112 int
 113 acpi_battery_get_battinfo(device_t dev, struct acpi_battinfo *battinfo)
 114 {
 115     int batt_stat, devcount, dev_idx, error, i;
 116     int total_cap, total_min, valid_rate, valid_units;
 117     devclass_t batt_dc;
 118     device_t batt_dev;
 119     struct acpi_bst *bst;
 120     struct acpi_bif *bif;
 121     struct acpi_battinfo *bi;
 122
 123     /*
 124      * Get the battery devclass and max unit for battery devices.  If there
 125      * are none or error, return immediately.
 126      */
 127     batt_dc = devclass_find("battery");
 128     if (batt_dc == NULL)
 129         return (ENXIO);
 130     devcount = devclass_get_maxunit(batt_dc);
 131     if (devcount == 0)
 132         return (ENXIO);
 133
 134     /*
 135      * Allocate storage for all _BST data, their derived battinfo data,
 136      * and the current battery's _BIF data.
 137      */
 138     bst = kmalloc(devcount * sizeof(*bst), M_TEMP, M_WAITOK | M_ZERO);
 139     bi = kmalloc(devcount * sizeof(*bi), M_TEMP, M_WAITOK | M_ZERO);
 140     bif = kmalloc(sizeof(*bif), M_TEMP, M_WAITOK | M_ZERO);
 141
 142     /*
 143      * Pass 1:  for each battery that is present and valid, get its status,
 144      * calculate percent capacity remaining, and sum all the current
 145      * discharge rates.
 146      */
 147     dev_idx = -1;
 148     batt_stat = valid_rate = valid_units = 0;
 149     for (i = 0; i < devcount; i++) {
 150         /* Default info for every battery is "not present". */
 151         acpi_reset_battinfo(&bi[i]);
 152
 153         /*
 154          * Find the device.  Since devcount is in terms of max units, this
 155          * may be a sparse array so skip devices that aren't present.
 156          */
 157         batt_dev = devclass_get_device(batt_dc, i);
 158         if (batt_dev == NULL)
 159             continue;
 160
 161         /* If examining a specific battery and this is it, record its index. */
 162         if (dev != NULL && dev == batt_dev)
 163             dev_idx = i;
 164
 165         /*
 166          * Be sure we can get various info from the battery.  Note that
 167          * acpi_BatteryIsPresent() is not enough because smart batteries only
 168          * return that the device is present.
 169          */
 170         if (!acpi_BatteryIsPresent(batt_dev) ||
 171             ACPI_BATT_GET_STATUS(batt_dev, &bst[i]) != 0 ||
 172             ACPI_BATT_GET_INFO(batt_dev, bif) != 0)
 173             continue;
 174
 175         /* If a battery is not installed, we sometimes get strange values. */
 176         if (!acpi_battery_bst_valid(&bst[i]) ||
 177             !acpi_battery_bif_valid(bif))
 178             continue;
 179
 180         /*
 181          * Record current state.  If both charging and discharging are set,
 182          * ignore the charging flag.
 183          */
 184         valid_units++;
 185         if ((bst[i].state & ACPI_BATT_STAT_DISCHARG) != 0)
 186             bst[i].state &= ~ACPI_BATT_STAT_CHARGING;
 187         batt_stat |= bst[i].state;
 188         bi[i].state = bst[i].state;
 189
 190         /*
 191          * If the battery info is in terms of mA, convert to mW by
 192          * multiplying by the design voltage.  If the design voltage
 193          * is 0 (due to some error reading the battery), skip this
 194          * conversion.
 195          */
 196         if (bif->units == ACPI_BIF_UNITS_MA && bif->dvol != 0) {
 197             bst[i].rate = (bst[i].rate * bif->dvol) / 1000;
 198             bst[i].cap = (bst[i].cap * bif->dvol) / 1000;
 199             bif->lfcap = (bif->lfcap * bif->dvol) / 1000;
 200         }
 201
 202         /* Calculate percent capacity remaining. */
 203         bi[i].cap = (100 * bst[i].cap) / bif->lfcap;
 204
 205         /*
 206          * Some laptops report the "design-capacity" instead of the
 207          * "real-capacity" when the battery is fully charged.  That breaks
 208          * the above arithmetic as it needs to be 100% maximum.
 209          */
 210         if (bi[i].cap > 100)
 211             bi[i].cap = 100;
 212
 213         /*
 214          * On systems with more than one battery, they may get used
 215          * sequentially, thus bst.rate may only signify the one currently
 216          * in use.  For the remaining batteries, bst.rate will be zero,
 217          * which makes it impossible to calculate the total remaining time.
 218          * Therefore, we sum the bst.rate for batteries in the discharging
 219          * state and use the sum to calculate the total remaining time.
 220          */
 221         if (bst[i].rate != ACPI_BATT_UNKNOWN &&
 222             (bst[i].state & ACPI_BATT_STAT_DISCHARG) != 0)
 223             valid_rate += bst[i].rate;
 224     }
 225
 226     /* If the caller asked for a device but we didn't find it, error. */
 227     if (dev != NULL && dev_idx == -1) {
 228         error = ENXIO;
 229         goto out;
 230     }
 231
 232     /* Pass 2:  calculate capacity and remaining time for all batteries. */
 233     total_cap = total_min = 0;
 234     for (i = 0; i < devcount; i++) {
 235         /*
 236          * If any batteries are discharging, use the sum of the bst.rate
 237          * values.  Otherwise, we are on AC power, and there is infinite
 238          * time remaining for this battery until we go offline.
 239          */
 240         if (valid_rate > 0)
 241             bi[i].min = (60 * bst[i].cap) / valid_rate;
 242         else
 243             bi[i].min = 0;
 244         total_min += bi[i].min;
 245
 246         /* If this battery is not present, don't use its capacity. */
 247         if (bi[i].cap != -1)
 248             total_cap += bi[i].cap;
 249     }
 250
 251     /*
 252      * Return total battery percent and time remaining.  If there are
 253      * no valid batteries, report values as unknown.
 254      */
 255     if (valid_units > 0) {
 256         if (dev == NULL) {
 257             battinfo->cap = total_cap / valid_units;
 258             battinfo->min = total_min;
 259             battinfo->state = batt_stat;
 260             battinfo->rate = valid_rate;
 261         } else {
 262             battinfo->cap = bi[dev_idx].cap;
 263             battinfo->min = bi[dev_idx].min;
 264             battinfo->state = bi[dev_idx].state;
 265             battinfo->rate = bst[dev_idx].rate;
 266         }
 267
 268         /*
 269          * If the queried battery has no discharge rate or is charging,
 270          * report that we don't know the remaining time.
 271          */
 272         if (valid_rate == 0 || (battinfo->state & ACPI_BATT_STAT_CHARGING))
 273             battinfo->min = -1;
 274     } else
 275         acpi_reset_battinfo(battinfo);
 276
 277     error = 0;
 278
 279 out:
 280     if (bi)
 281         kfree(bi, M_TEMP);
 282     if (bif)
 283         kfree(bif, M_TEMP);
 284     if (bst)
 285         kfree(bst, M_TEMP);
 286     return (error);
 287 }
 288
 289 static void
 290 acpi_reset_battinfo(struct acpi_battinfo *info)
 291 {
 292     info->cap = -1;
 293     info->min = -1;
 294     info->state = ACPI_BATT_STAT_NOT_PRESENT;
 295     info->rate = -1;
 296 }
 297
 298 /* Make string printable, removing invalid chars. */
 299 static void
 300 acpi_battery_clean_str(char *str, int len)
 301 {
 302     int i;
 303
 304     for (i = 0; i < len && *str != '\0'; i++, str++) {
 305         if (!isprint(*str))
 306             *str = '?';
 307     }
 308
 309     /* NUL-terminate the string if we reached the end. */
 310     if (i == len)
 311         *str = '\0';
 312 }
 313
 314 /*
 315  * The battery interface deals with devices and methods but userland
 316  * expects a logical unit number.  Convert a logical unit to a device_t.
 317  */
 318 static device_t
 319 acpi_battery_find_dev(u_int logical_unit)
 320 {
 321     int found_unit, i, maxunit;
 322     device_t dev;
 323     devclass_t batt_dc;
 324
 325     dev = NULL;
 326     found_unit = 0;
 327     batt_dc = devclass_find("battery");
 328     maxunit = devclass_get_maxunit(batt_dc);
 329     for (i = 0; i < maxunit; i++) {
 330         dev = devclass_get_device(batt_dc, i);
 331         if (dev == NULL)
 332             continue;
 333         if (logical_unit == found_unit)
 334             break;
 335         found_unit++;
 336         dev = NULL;
 337     }
 338
 339     return (dev);
 340 }
 341
 342 static int
 343 acpi_battery_ioctl(u_long cmd, caddr_t addr, void *arg)
 344 {
 345     union acpi_battery_ioctl_arg *ioctl_arg;
 346     int error, unit;
 347     device_t dev;
 348
 349     /* For commands that use the ioctl_arg struct, validate it first. */
 350     error = ENXIO;
 351     unit = 0;
 352     dev = NULL;
 353     ioctl_arg = NULL;
 354     if (IOCPARM_LEN(cmd) == sizeof(*ioctl_arg)) {
 355         ioctl_arg = (union acpi_battery_ioctl_arg *)addr;
 356         unit = ioctl_arg->unit;
 357         if (unit != ACPI_BATTERY_ALL_UNITS)
 358             dev = acpi_battery_find_dev(unit);
 359     }
 360
 361     /*
 362      * No security check required: information retrieval only.  If
 363      * new functions are added here, a check might be required.
 364      */
 365     switch (cmd) {
 366     case ACPIIO_BATT_GET_UNITS:
 367         *(int *)addr = acpi_battery_get_units();
 368         error = 0;
 369         break;
 370     case ACPIIO_BATT_GET_BATTINFO:
 371         if (dev != NULL || unit == ACPI_BATTERY_ALL_UNITS) {
 372             bzero(&ioctl_arg->battinfo, sizeof(ioctl_arg->battinfo));
 373             error = acpi_battery_get_battinfo(dev, &ioctl_arg->battinfo);
 374         }
 375         break;
 376     case ACPIIO_BATT_GET_BIF:
 377         if (dev != NULL) {
 378             bzero(&ioctl_arg->bif, sizeof(ioctl_arg->bif));
 379             error = ACPI_BATT_GET_INFO(dev, &ioctl_arg->bif);
 380
 381             /*
 382              * Remove invalid characters.  Perhaps this should be done
 383              * within a convenience function so all callers get the
 384              * benefit.
 385              */
 386             acpi_battery_clean_str(ioctl_arg->bif.model,
 387                 sizeof(ioctl_arg->bif.model));
 388             acpi_battery_clean_str(ioctl_arg->bif.serial,
 389                 sizeof(ioctl_arg->bif.serial));
 390             acpi_battery_clean_str(ioctl_arg->bif.type,
 391                 sizeof(ioctl_arg->bif.type));
 392             acpi_battery_clean_str(ioctl_arg->bif.oeminfo,
 393                 sizeof(ioctl_arg->bif.oeminfo));
 394         }
 395         break;
 396     case ACPIIO_BATT_GET_BST:
 397         if (dev != NULL) {
 398             bzero(&ioctl_arg->bst, sizeof(ioctl_arg->bst));
 399             error = ACPI_BATT_GET_STATUS(dev, &ioctl_arg->bst);
 400         }
 401         break;
 402     default:
 403         error = EINVAL;
 404     }
 405
 406     return (error);
 407 }
 408
 409 static int
 410 acpi_battery_sysctl(SYSCTL_HANDLER_ARGS)
 411 {
 412     int val, error;
 413
 414     acpi_battery_get_battinfo(NULL, &acpi_battery_battinfo);
 415     val = *(u_int *)oidp->oid_arg1;
 416     error = sysctl_handle_int(oidp, &val, 0, req);
 417     return (error);
 418 }
 419
 420 static int
 421 acpi_battery_units_sysctl(SYSCTL_HANDLER_ARGS)
 422 {
 423     int count, error;
 424
 425     count = acpi_battery_get_units();
 426     error = sysctl_handle_int(oidp, &count, 0, req);
 427     return (error);
 428 }
 429
 430 static int
 431 acpi_battery_init(void)
 432 {
 433     struct acpi_softc   *sc;
 434     device_t             dev;
 435     int                  error;
 436
 437     error = ENXIO;
 438     dev = devclass_get_device(devclass_find("acpi"), 0);
 439     if (dev == NULL)
 440         goto out;
 441     sc = device_get_softc(dev);
 442
 443     error = acpi_register_ioctl(ACPIIO_BATT_GET_UNITS, acpi_battery_ioctl,
 444         NULL);
 445     if (error != 0)
 446         goto out;
 447     error = acpi_register_ioctl(ACPIIO_BATT_GET_BATTINFO, acpi_battery_ioctl,
 448         NULL);
 449     if (error != 0)
 450         goto out;
 451     error = acpi_register_ioctl(ACPIIO_BATT_GET_BIF, acpi_battery_ioctl, NULL);
 452     if (error != 0)
 453         goto out;
 454     error = acpi_register_ioctl(ACPIIO_BATT_GET_BST, acpi_battery_ioctl, NULL);
 455     if (error != 0)
 456         goto out;
 457
 458     sysctl_ctx_init(&acpi_battery_sysctl_ctx);
 459     acpi_battery_sysctl_tree = SYSCTL_ADD_NODE(&acpi_battery_sysctl_ctx,
 460         SYSCTL_CHILDREN(sc->acpi_sysctl_tree), OID_AUTO, "battery", CTLFLAG_RD,
 461         0, "battery status and info");
 462     SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
 463         SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
 464         OID_AUTO, "life", CTLTYPE_INT | CTLFLAG_RD,
 465         &acpi_battery_battinfo.cap, 0, acpi_battery_sysctl, "I",
 466         "percent capacity remaining");
 467     SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
 468         SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
 469         OID_AUTO, "time", CTLTYPE_INT | CTLFLAG_RD,
 470         &acpi_battery_battinfo.min, 0, acpi_battery_sysctl, "I",
 471         "remaining time in minutes");
 472     SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
 473         SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
 474         OID_AUTO, "state", CTLTYPE_INT | CTLFLAG_RD,
 475         &acpi_battery_battinfo.state, 0, acpi_battery_sysctl, "I",
 476         "current status flags");
 477     SYSCTL_ADD_PROC(&acpi_battery_sysctl_ctx,
 478         SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
 479         OID_AUTO, "units", CTLTYPE_INT | CTLFLAG_RD,
 480         NULL, 0, acpi_battery_units_sysctl, "I", "number of batteries");
 481     SYSCTL_ADD_INT(&acpi_battery_sysctl_ctx,
 482         SYSCTL_CHILDREN(acpi_battery_sysctl_tree),
 483         OID_AUTO, "info_expire", CTLFLAG_RW,
 484         &acpi_battery_info_expire, 0,
 485         "time in seconds until info is refreshed");
 486
 487     acpi_batteries_initted = TRUE;
 488
 489 out:
 490     if (error != 0) {
 491         acpi_deregister_ioctl(ACPIIO_BATT_GET_UNITS, acpi_battery_ioctl);
 492         acpi_deregister_ioctl(ACPIIO_BATT_GET_BATTINFO, acpi_battery_ioctl);
 493         acpi_deregister_ioctl(ACPIIO_BATT_GET_BIF, acpi_battery_ioctl);
 494         acpi_deregister_ioctl(ACPIIO_BATT_GET_BST, acpi_battery_ioctl);
 495     }
 496     return (error);
 497 }