drivers/acpi/sbs.c

   1 /*
   2  *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
   3  *
   4  *  Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
   5  *  Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
   6  *  Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
   7  *
   8  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or (at
  13  *  your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful, but
  16  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  *  General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/module.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/kernel.h>
  32
  33 #include <linux/acpi.h>
  34 #include <linux/timer.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/delay.h>
  37 #include <linux/power_supply.h>
  38
  39 #include "sbshc.h"
  40 #include "battery.h"
  41
  42 #define PREFIX "ACPI: "
  43
  44 #define ACPI_SBS_CLASS                  "sbs"
  45 #define ACPI_AC_CLASS                   "ac_adapter"
  46 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  47 #define ACPI_SBS_FILE_INFO              "info"
  48 #define ACPI_SBS_FILE_STATE             "state"
  49 #define ACPI_SBS_FILE_ALARM             "alarm"
  50 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  51 #define ACPI_AC_DIR_NAME                "AC0"
  52
  53 #define ACPI_SBS_NOTIFY_STATUS          0x80
  54 #define ACPI_SBS_NOTIFY_INFO            0x81
  55
  56 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  57 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  58 MODULE_LICENSE("GPL");
  59
  60 static unsigned int cache_time = 1000;
  61 module_param(cache_time, uint, 0644);
  62 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  63
  64 #define MAX_SBS_BAT                     4
  65 #define ACPI_SBS_BLOCK_MAX              32
  66
  67 static const struct acpi_device_id sbs_device_ids[] = {
  68         {"ACPI0002", 0},
  69         {"", 0},
  70 };
  71 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  72
  73 struct acpi_battery {
  74         struct power_supply bat;
  75         struct acpi_sbs *sbs;
  76         unsigned long update_time;
  77         char name[8];
  78         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  79         char device_name[ACPI_SBS_BLOCK_MAX];
  80         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  81         u16 alarm_capacity;
  82         u16 full_charge_capacity;
  83         u16 design_capacity;
  84         u16 design_voltage;
  85         u16 serial_number;
  86         u16 cycle_count;
  87         u16 temp_now;
  88         u16 voltage_now;
  89         s16 rate_now;
  90         s16 rate_avg;
  91         u16 capacity_now;
  92         u16 state_of_charge;
  93         u16 state;
  94         u16 mode;
  95         u16 spec;
  96         u8 id;
  97         u8 present:1;
  98         u8 have_sysfs_alarm:1;
  99 };
 100
 101 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
 102
 103 struct acpi_sbs {
 104         struct power_supply charger;
 105         struct acpi_device *device;
 106         struct acpi_smb_hc *hc;
 107         struct mutex lock;
 108         struct acpi_battery battery[MAX_SBS_BAT];
 109         u8 batteries_supported:4;
 110         u8 manager_present:1;
 111         u8 charger_present:1;
 112         u8 charger_exists:1;
 113 };
 114
 115 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 116
 117 static int acpi_sbs_remove(struct acpi_device *device);
 118 static int acpi_battery_get_state(struct acpi_battery *battery);
 119
 120 static inline int battery_scale(int log)
 121 {
 122         int scale = 1;
 123         while (log--)
 124                 scale *= 10;
 125         return scale;
 126 }
 127
 128 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 129 {
 130         return battery_scale((battery->spec & 0x0f00) >> 8);
 131 }
 132
 133 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 134 {
 135         return battery_scale((battery->spec & 0xf000) >> 12);
 136 }
 137
 138 static inline int acpi_battery_mode(struct acpi_battery *battery)
 139 {
 140         return (battery->mode & 0x8000);
 141 }
 142
 143 static inline int acpi_battery_scale(struct acpi_battery *battery)
 144 {
 145         return (acpi_battery_mode(battery) ? 10 : 1) *
 146             acpi_battery_ipscale(battery);
 147 }
 148
 149 static int sbs_get_ac_property(struct power_supply *psy,
 150                                enum power_supply_property psp,
 151                                union power_supply_propval *val)
 152 {
 153         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 154         switch (psp) {
 155         case POWER_SUPPLY_PROP_ONLINE:
 156                 val->intval = sbs->charger_present;
 157                 break;
 158         default:
 159                 return -EINVAL;
 160         }
 161         return 0;
 162 }
 163
 164 static int acpi_battery_technology(struct acpi_battery *battery)
 165 {
 166         if (!strcasecmp("NiCd", battery->device_chemistry))
 167                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 168         if (!strcasecmp("NiMH", battery->device_chemistry))
 169                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 170         if (!strcasecmp("LION", battery->device_chemistry))
 171                 return POWER_SUPPLY_TECHNOLOGY_LION;
 172         if (!strcasecmp("LiP", battery->device_chemistry))
 173                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 174         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 175 }
 176
 177 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 178                                          enum power_supply_property psp,
 179                                          union power_supply_propval *val)
 180 {
 181         struct acpi_battery *battery = to_acpi_battery(psy);
 182
 183         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 184                 return -ENODEV;
 185
 186         acpi_battery_get_state(battery);
 187         switch (psp) {
 188         case POWER_SUPPLY_PROP_STATUS:
 189                 if (battery->rate_now < 0)
 190                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 191                 else if (battery->rate_now > 0)
 192                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 193                 else
 194                         val->intval = POWER_SUPPLY_STATUS_FULL;
 195                 break;
 196         case POWER_SUPPLY_PROP_PRESENT:
 197                 val->intval = battery->present;
 198                 break;
 199         case POWER_SUPPLY_PROP_TECHNOLOGY:
 200                 val->intval = acpi_battery_technology(battery);
 201                 break;
 202         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 203                 val->intval = battery->cycle_count;
 204                 break;
 205         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 206                 val->intval = battery->design_voltage *
 207                         acpi_battery_vscale(battery) * 1000;
 208                 break;
 209         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 210                 val->intval = battery->voltage_now *
 211                                 acpi_battery_vscale(battery) * 1000;
 212                 break;
 213         case POWER_SUPPLY_PROP_CURRENT_NOW:
 214         case POWER_SUPPLY_PROP_POWER_NOW:
 215                 val->intval = abs(battery->rate_now) *
 216                                 acpi_battery_ipscale(battery) * 1000;
 217                 val->intval *= (acpi_battery_mode(battery)) ?
 218                                 (battery->voltage_now *
 219                                 acpi_battery_vscale(battery) / 1000) : 1;
 220                 break;
 221         case POWER_SUPPLY_PROP_CURRENT_AVG:
 222         case POWER_SUPPLY_PROP_POWER_AVG:
 223                 val->intval = abs(battery->rate_avg) *
 224                                 acpi_battery_ipscale(battery) * 1000;
 225                 val->intval *= (acpi_battery_mode(battery)) ?
 226                                 (battery->voltage_now *
 227                                 acpi_battery_vscale(battery) / 1000) : 1;
 228                 break;
 229         case POWER_SUPPLY_PROP_CAPACITY:
 230                 val->intval = battery->state_of_charge;
 231                 break;
 232         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 233         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 234                 val->intval = battery->design_capacity *
 235                         acpi_battery_scale(battery) * 1000;
 236                 break;
 237         case POWER_SUPPLY_PROP_CHARGE_FULL:
 238         case POWER_SUPPLY_PROP_ENERGY_FULL:
 239                 val->intval = battery->full_charge_capacity *
 240                         acpi_battery_scale(battery) * 1000;
 241                 break;
 242         case POWER_SUPPLY_PROP_CHARGE_NOW:
 243         case POWER_SUPPLY_PROP_ENERGY_NOW:
 244                 val->intval = battery->capacity_now *
 245                                 acpi_battery_scale(battery) * 1000;
 246                 break;
 247         case POWER_SUPPLY_PROP_TEMP:
 248                 val->intval = battery->temp_now - 2730; // dK -> dC
 249                 break;
 250         case POWER_SUPPLY_PROP_MODEL_NAME:
 251                 val->strval = battery->device_name;
 252                 break;
 253         case POWER_SUPPLY_PROP_MANUFACTURER:
 254                 val->strval = battery->manufacturer_name;
 255                 break;
 256         default:
 257                 return -EINVAL;
 258         }
 259         return 0;
 260 }
 261
 262 static enum power_supply_property sbs_ac_props[] = {
 263         POWER_SUPPLY_PROP_ONLINE,
 264 };
 265
 266 static enum power_supply_property sbs_charge_battery_props[] = {
 267         POWER_SUPPLY_PROP_STATUS,
 268         POWER_SUPPLY_PROP_PRESENT,
 269         POWER_SUPPLY_PROP_TECHNOLOGY,
 270         POWER_SUPPLY_PROP_CYCLE_COUNT,
 271         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 272         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 273         POWER_SUPPLY_PROP_CURRENT_NOW,
 274         POWER_SUPPLY_PROP_CURRENT_AVG,
 275         POWER_SUPPLY_PROP_CAPACITY,
 276         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 277         POWER_SUPPLY_PROP_CHARGE_FULL,
 278         POWER_SUPPLY_PROP_CHARGE_NOW,
 279         POWER_SUPPLY_PROP_TEMP,
 280         POWER_SUPPLY_PROP_MODEL_NAME,
 281         POWER_SUPPLY_PROP_MANUFACTURER,
 282 };
 283
 284 static enum power_supply_property sbs_energy_battery_props[] = {
 285         POWER_SUPPLY_PROP_STATUS,
 286         POWER_SUPPLY_PROP_PRESENT,
 287         POWER_SUPPLY_PROP_TECHNOLOGY,
 288         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 289         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 290         POWER_SUPPLY_PROP_CURRENT_NOW,
 291         POWER_SUPPLY_PROP_CURRENT_AVG,
 292         POWER_SUPPLY_PROP_POWER_NOW,
 293         POWER_SUPPLY_PROP_POWER_AVG,
 294         POWER_SUPPLY_PROP_CAPACITY,
 295         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 296         POWER_SUPPLY_PROP_ENERGY_FULL,
 297         POWER_SUPPLY_PROP_ENERGY_NOW,
 298         POWER_SUPPLY_PROP_TEMP,
 299         POWER_SUPPLY_PROP_MODEL_NAME,
 300         POWER_SUPPLY_PROP_MANUFACTURER,
 301 };
 302
 303
 304 /* --------------------------------------------------------------------------
 305                             Smart Battery System Management
 306    -------------------------------------------------------------------------- */
 307
 308 struct acpi_battery_reader {
 309         u8 command;             /* command for battery */
 310         u8 mode;                /* word or block? */
 311         size_t offset;          /* offset inside struct acpi_sbs_battery */
 312 };
 313
 314 static struct acpi_battery_reader info_readers[] = {
 315         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 316         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 317         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 318         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 319         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 320         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 321         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 322         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 323         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 324         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 325         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 326 };
 327
 328 static struct acpi_battery_reader state_readers[] = {
 329         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 330         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 331         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 332         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 333         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 334         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 335         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 336 };
 337
 338 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 339 {
 340         int result = 0;
 341         u16 battery_system_info;
 342
 343         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 344                                  0x04, (u8 *)&battery_system_info);
 345         if (!result)
 346                 sbs->batteries_supported = battery_system_info & 0x000f;
 347         return result;
 348 }
 349
 350 static int acpi_battery_get_info(struct acpi_battery *battery)
 351 {
 352         int i, result = 0;
 353
 354         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 355                 result = acpi_smbus_read(battery->sbs->hc,
 356                                          info_readers[i].mode,
 357                                          ACPI_SBS_BATTERY,
 358                                          info_readers[i].command,
 359                                          (u8 *) battery +
 360                                                 info_readers[i].offset);
 361                 if (result)
 362                         break;
 363         }
 364         return result;
 365 }
 366
 367 static int acpi_battery_get_state(struct acpi_battery *battery)
 368 {
 369         int i, result = 0;
 370
 371         if (battery->update_time &&
 372             time_before(jiffies, battery->update_time +
 373                                 msecs_to_jiffies(cache_time)))
 374                 return 0;
 375         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 376                 result = acpi_smbus_read(battery->sbs->hc,
 377                                          state_readers[i].mode,
 378                                          ACPI_SBS_BATTERY,
 379                                          state_readers[i].command,
 380                                          (u8 *)battery +
 381                                                 state_readers[i].offset);
 382                 if (result)
 383                         goto end;
 384         }
 385       end:
 386         battery->update_time = jiffies;
 387         return result;
 388 }
 389
 390 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 391 {
 392         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 393                                  ACPI_SBS_BATTERY, 0x01,
 394                                  (u8 *)&battery->alarm_capacity);
 395 }
 396
 397 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 398 {
 399         struct acpi_sbs *sbs = battery->sbs;
 400         u16 value, sel = 1 << (battery->id + 12);
 401
 402         int ret;
 403
 404
 405         if (sbs->manager_present) {
 406                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 407                                 0x01, (u8 *)&value);
 408                 if (ret)
 409                         goto end;
 410                 if ((value & 0xf000) != sel) {
 411                         value &= 0x0fff;
 412                         value |= sel;
 413                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 414                                          ACPI_SBS_MANAGER,
 415                                          0x01, (u8 *)&value, 2);
 416                 if (ret)
 417                         goto end;
 418                 }
 419         }
 420         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 421                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 422       end:
 423         return ret;
 424 }
 425
 426 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 427 {
 428         int result;
 429         u16 status;
 430
 431         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 432                                  0x13, (u8 *) & status);
 433
 434         if (result)
 435                 return result;
 436
 437         /*
 438          * The spec requires that bit 4 always be 1. If it's not set, assume
 439          * that the implementation doesn't support an SBS charger
 440          */
 441         if (!(status >> 4) & 0x1)
 442                 return -ENODEV;
 443
 444         sbs->charger_present = (status >> 15) & 0x1;
 445         return 0;
 446 }
 447
 448 static ssize_t acpi_battery_alarm_show(struct device *dev,
 449                                         struct device_attribute *attr,
 450                                         char *buf)
 451 {
 452         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 453         acpi_battery_get_alarm(battery);
 454         return sprintf(buf, "%d\n", battery->alarm_capacity *
 455                                 acpi_battery_scale(battery) * 1000);
 456 }
 457
 458 static ssize_t acpi_battery_alarm_store(struct device *dev,
 459                                         struct device_attribute *attr,
 460                                         const char *buf, size_t count)
 461 {
 462         unsigned long x;
 463         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 464         if (sscanf(buf, "%lu\n", &x) == 1)
 465                 battery->alarm_capacity = x /
 466                         (1000 * acpi_battery_scale(battery));
 467         if (battery->present)
 468                 acpi_battery_set_alarm(battery);
 469         return count;
 470 }
 471
 472 static struct device_attribute alarm_attr = {
 473         .attr = {.name = "alarm", .mode = 0644},
 474         .show = acpi_battery_alarm_show,
 475         .store = acpi_battery_alarm_store,
 476 };
 477
 478 /* --------------------------------------------------------------------------
 479                                  Driver Interface
 480    -------------------------------------------------------------------------- */
 481 static int acpi_battery_read(struct acpi_battery *battery)
 482 {
 483         int result = 0, saved_present = battery->present;
 484         u16 state;
 485
 486         if (battery->sbs->manager_present) {
 487                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 488                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 489                 if (!result)
 490                         battery->present = state & (1 << battery->id);
 491                 state &= 0x0fff;
 492                 state |= 1 << (battery->id + 12);
 493                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 494                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 495         } else if (battery->id == 0)
 496                 battery->present = 1;
 497         if (result || !battery->present)
 498                 return result;
 499
 500         if (saved_present != battery->present) {
 501                 battery->update_time = 0;
 502                 result = acpi_battery_get_info(battery);
 503                 if (result)
 504                         return result;
 505         }
 506         result = acpi_battery_get_state(battery);
 507         return result;
 508 }
 509
 510 /* Smart Battery */
 511 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 512 {
 513         struct acpi_battery *battery = &sbs->battery[id];
 514         int result;
 515
 516         battery->id = id;
 517         battery->sbs = sbs;
 518         result = acpi_battery_read(battery);
 519         if (result)
 520                 return result;
 521
 522         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 523         battery->bat.name = battery->name;
 524         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 525         if (!acpi_battery_mode(battery)) {
 526                 battery->bat.properties = sbs_charge_battery_props;
 527                 battery->bat.num_properties =
 528                     ARRAY_SIZE(sbs_charge_battery_props);
 529         } else {
 530                 battery->bat.properties = sbs_energy_battery_props;
 531                 battery->bat.num_properties =
 532                     ARRAY_SIZE(sbs_energy_battery_props);
 533         }
 534         battery->bat.get_property = acpi_sbs_battery_get_property;
 535         result = power_supply_register(&sbs->device->dev, &battery->bat);
 536         if (result)
 537                 goto end;
 538         result = device_create_file(battery->bat.dev, &alarm_attr);
 539         if (result)
 540                 goto end;
 541         battery->have_sysfs_alarm = 1;
 542       end:
 543         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 544                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 545                battery->name, battery->present ? "present" : "absent");
 546         return result;
 547 }
 548
 549 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 550 {
 551         struct acpi_battery *battery = &sbs->battery[id];
 552
 553         if (battery->bat.dev) {
 554                 if (battery->have_sysfs_alarm)
 555                         device_remove_file(battery->bat.dev, &alarm_attr);
 556                 power_supply_unregister(&battery->bat);
 557         }
 558 }
 559
 560 static int acpi_charger_add(struct acpi_sbs *sbs)
 561 {
 562         int result;
 563
 564         result = acpi_ac_get_present(sbs);
 565         if (result)
 566                 goto end;
 567
 568         sbs->charger_exists = 1;
 569         sbs->charger.name = "sbs-charger";
 570         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 571         sbs->charger.properties = sbs_ac_props;
 572         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 573         sbs->charger.get_property = sbs_get_ac_property;
 574         power_supply_register(&sbs->device->dev, &sbs->charger);
 575         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 576                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 577                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 578       end:
 579         return result;
 580 }
 581
 582 static void acpi_charger_remove(struct acpi_sbs *sbs)
 583 {
 584         if (sbs->charger.dev)
 585                 power_supply_unregister(&sbs->charger);
 586 }
 587
 588 static void acpi_sbs_callback(void *context)
 589 {
 590         int id;
 591         struct acpi_sbs *sbs = context;
 592         struct acpi_battery *bat;
 593         u8 saved_charger_state = sbs->charger_present;
 594         u8 saved_battery_state;
 595
 596         if (sbs->charger_exists) {
 597                 acpi_ac_get_present(sbs);
 598                 if (sbs->charger_present != saved_charger_state)
 599                         kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 600         }
 601
 602         if (sbs->manager_present) {
 603                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 604                         if (!(sbs->batteries_supported & (1 << id)))
 605                                 continue;
 606                         bat = &sbs->battery[id];
 607                         saved_battery_state = bat->present;
 608                         acpi_battery_read(bat);
 609                         if (saved_battery_state == bat->present)
 610                                 continue;
 611                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 612                 }
 613         }
 614 }
 615
 616 static int acpi_sbs_add(struct acpi_device *device)
 617 {
 618         struct acpi_sbs *sbs;
 619         int result = 0;
 620         int id;
 621
 622         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 623         if (!sbs) {
 624                 result = -ENOMEM;
 625                 goto end;
 626         }
 627
 628         mutex_init(&sbs->lock);
 629
 630         sbs->hc = acpi_driver_data(device->parent);
 631         sbs->device = device;
 632         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 633         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 634         device->driver_data = sbs;
 635
 636         result = acpi_charger_add(sbs);
 637         if (result && result != -ENODEV)
 638                 goto end;
 639
 640         result = acpi_manager_get_info(sbs);
 641         if (!result) {
 642                 sbs->manager_present = 1;
 643                 for (id = 0; id < MAX_SBS_BAT; ++id)
 644                         if ((sbs->batteries_supported & (1 << id)))
 645                                 acpi_battery_add(sbs, id);
 646         } else
 647                 acpi_battery_add(sbs, 0);
 648         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 649       end:
 650         if (result)
 651                 acpi_sbs_remove(device);
 652         return result;
 653 }
 654
 655 static int acpi_sbs_remove(struct acpi_device *device)
 656 {
 657         struct acpi_sbs *sbs;
 658         int id;
 659
 660         if (!device)
 661                 return -EINVAL;
 662         sbs = acpi_driver_data(device);
 663         if (!sbs)
 664                 return -EINVAL;
 665         mutex_lock(&sbs->lock);
 666         acpi_smbus_unregister_callback(sbs->hc);
 667         for (id = 0; id < MAX_SBS_BAT; ++id)
 668                 acpi_battery_remove(sbs, id);
 669         acpi_charger_remove(sbs);
 670         mutex_unlock(&sbs->lock);
 671         mutex_destroy(&sbs->lock);
 672         kfree(sbs);
 673         return 0;
 674 }
 675
 676 #ifdef CONFIG_PM_SLEEP
 677 static int acpi_sbs_resume(struct device *dev)
 678 {
 679         struct acpi_sbs *sbs;
 680         if (!dev)
 681                 return -EINVAL;
 682         sbs = to_acpi_device(dev)->driver_data;
 683         acpi_sbs_callback(sbs);
 684         return 0;
 685 }
 686 #else
 687 #define acpi_sbs_resume NULL
 688 #endif
 689
 690 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
 691
 692 static struct acpi_driver acpi_sbs_driver = {
 693         .name = "sbs",
 694         .class = ACPI_SBS_CLASS,
 695         .ids = sbs_device_ids,
 696         .ops = {
 697                 .add = acpi_sbs_add,
 698                 .remove = acpi_sbs_remove,
 699                 },
 700         .drv.pm = &acpi_sbs_pm,
 701 };
 702
 703 static int __init acpi_sbs_init(void)
 704 {
 705         int result = 0;
 706
 707         if (acpi_disabled)
 708                 return -ENODEV;
 709
 710         result = acpi_bus_register_driver(&acpi_sbs_driver);
 711         if (result < 0)
 712                 return -ENODEV;
 713
 714         return 0;
 715 }
 716
 717 static void __exit acpi_sbs_exit(void)
 718 {
 719         acpi_bus_unregister_driver(&acpi_sbs_driver);
 720         return;
 721 }
 722
 723 module_init(acpi_sbs_init);
 724 module_exit(acpi_sbs_exit);