drivers/acpi/sbs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
   4  *
   5  *  Copyright (c) 2007 Alexey Starikovskiy <[email protected]>
   6  *  Copyright (c) 2005-2007 Vladimir Lebedev <[email protected]>
   7  *  Copyright (c) 2005 Rich Townsend <[email protected]>
   8  */
   9
  10 #define pr_fmt(fmt) "ACPI: " fmt
  11
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <linux/module.h>
  15 #include <linux/moduleparam.h>
  16 #include <linux/kernel.h>
  17
  18 #include <linux/acpi.h>
  19 #include <linux/timer.h>
  20 #include <linux/jiffies.h>
  21 #include <linux/delay.h>
  22 #include <linux/power_supply.h>
  23 #include <linux/platform_data/x86/apple.h>
  24 #include <acpi/battery.h>
  25
  26 #include "sbshc.h"
  27
  28 #define ACPI_SBS_CLASS                  "sbs"
  29 #define ACPI_AC_CLASS                   "ac_adapter"
  30 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  31 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  32 #define ACPI_AC_DIR_NAME                "AC0"
  33
  34 #define ACPI_SBS_NOTIFY_STATUS          0x80
  35 #define ACPI_SBS_NOTIFY_INFO            0x81
  36
  37 MODULE_AUTHOR("Alexey Starikovskiy <[email protected]>");
  38 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  39 MODULE_LICENSE("GPL");
  40
  41 static unsigned int cache_time = 1000;
  42 module_param(cache_time, uint, 0644);
  43 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  44
  45 #define MAX_SBS_BAT                     4
  46 #define ACPI_SBS_BLOCK_MAX              32
  47
  48 static const struct acpi_device_id sbs_device_ids[] = {
  49         {"ACPI0002", 0},
  50         {"", 0},
  51 };
  52 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  53
  54 struct acpi_battery {
  55         struct power_supply *bat;
  56         struct power_supply_desc bat_desc;
  57         struct acpi_sbs *sbs;
  58         unsigned long update_time;
  59         char name[8];
  60         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  61         char device_name[ACPI_SBS_BLOCK_MAX];
  62         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  63         u16 alarm_capacity;
  64         u16 full_charge_capacity;
  65         u16 design_capacity;
  66         u16 design_voltage;
  67         u16 serial_number;
  68         u16 cycle_count;
  69         u16 temp_now;
  70         u16 voltage_now;
  71         s16 rate_now;
  72         s16 rate_avg;
  73         u16 capacity_now;
  74         u16 state_of_charge;
  75         u16 state;
  76         u16 mode;
  77         u16 spec;
  78         u8 id;
  79         u8 present:1;
  80 };
  81
  82 #define to_acpi_battery(x) power_supply_get_drvdata(x)
  83
  84 struct acpi_sbs {
  85         struct power_supply *charger;
  86         struct acpi_device *device;
  87         struct acpi_smb_hc *hc;
  88         struct mutex lock;
  89         struct acpi_battery battery[MAX_SBS_BAT];
  90         u8 batteries_supported:4;
  91         u8 manager_present:1;
  92         u8 charger_present:1;
  93         u8 charger_exists:1;
  94 };
  95
  96 #define to_acpi_sbs(x) power_supply_get_drvdata(x)
  97
  98 static void acpi_sbs_remove(struct acpi_device *device);
  99 static int acpi_battery_get_state(struct acpi_battery *battery);
 100
 101 static inline int battery_scale(int log)
 102 {
 103         int scale = 1;
 104         while (log--)
 105                 scale *= 10;
 106         return scale;
 107 }
 108
 109 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 110 {
 111         return battery_scale((battery->spec & 0x0f00) >> 8);
 112 }
 113
 114 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 115 {
 116         return battery_scale((battery->spec & 0xf000) >> 12);
 117 }
 118
 119 static inline int acpi_battery_mode(struct acpi_battery *battery)
 120 {
 121         return (battery->mode & 0x8000);
 122 }
 123
 124 static inline int acpi_battery_scale(struct acpi_battery *battery)
 125 {
 126         return (acpi_battery_mode(battery) ? 10 : 1) *
 127             acpi_battery_ipscale(battery);
 128 }
 129
 130 static int sbs_get_ac_property(struct power_supply *psy,
 131                                enum power_supply_property psp,
 132                                union power_supply_propval *val)
 133 {
 134         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 135         switch (psp) {
 136         case POWER_SUPPLY_PROP_ONLINE:
 137                 val->intval = sbs->charger_present;
 138                 break;
 139         default:
 140                 return -EINVAL;
 141         }
 142         return 0;
 143 }
 144
 145 static int acpi_battery_technology(struct acpi_battery *battery)
 146 {
 147         if (!strcasecmp("NiCd", battery->device_chemistry))
 148                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 149         if (!strcasecmp("NiMH", battery->device_chemistry))
 150                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 151         if (!strcasecmp("LION", battery->device_chemistry))
 152                 return POWER_SUPPLY_TECHNOLOGY_LION;
 153         if (!strcasecmp("LiP", battery->device_chemistry))
 154                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 155         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 156 }
 157
 158 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 159                                          enum power_supply_property psp,
 160                                          union power_supply_propval *val)
 161 {
 162         struct acpi_battery *battery = to_acpi_battery(psy);
 163
 164         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 165                 return -ENODEV;
 166
 167         acpi_battery_get_state(battery);
 168         switch (psp) {
 169         case POWER_SUPPLY_PROP_STATUS:
 170                 if (battery->rate_now < 0)
 171                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 172                 else if (battery->rate_now > 0)
 173                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 174                 else
 175                         val->intval = POWER_SUPPLY_STATUS_FULL;
 176                 break;
 177         case POWER_SUPPLY_PROP_PRESENT:
 178                 val->intval = battery->present;
 179                 break;
 180         case POWER_SUPPLY_PROP_TECHNOLOGY:
 181                 val->intval = acpi_battery_technology(battery);
 182                 break;
 183         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 184                 val->intval = battery->cycle_count;
 185                 break;
 186         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 187                 val->intval = battery->design_voltage *
 188                         acpi_battery_vscale(battery) * 1000;
 189                 break;
 190         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 191                 val->intval = battery->voltage_now *
 192                                 acpi_battery_vscale(battery) * 1000;
 193                 break;
 194         case POWER_SUPPLY_PROP_CURRENT_NOW:
 195         case POWER_SUPPLY_PROP_POWER_NOW:
 196                 val->intval = abs(battery->rate_now) *
 197                                 acpi_battery_ipscale(battery) * 1000;
 198                 val->intval *= (acpi_battery_mode(battery)) ?
 199                                 (battery->voltage_now *
 200                                 acpi_battery_vscale(battery) / 1000) : 1;
 201                 break;
 202         case POWER_SUPPLY_PROP_CURRENT_AVG:
 203         case POWER_SUPPLY_PROP_POWER_AVG:
 204                 val->intval = abs(battery->rate_avg) *
 205                                 acpi_battery_ipscale(battery) * 1000;
 206                 val->intval *= (acpi_battery_mode(battery)) ?
 207                                 (battery->voltage_now *
 208                                 acpi_battery_vscale(battery) / 1000) : 1;
 209                 break;
 210         case POWER_SUPPLY_PROP_CAPACITY:
 211                 val->intval = battery->state_of_charge;
 212                 break;
 213         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 214         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 215                 val->intval = battery->design_capacity *
 216                         acpi_battery_scale(battery) * 1000;
 217                 break;
 218         case POWER_SUPPLY_PROP_CHARGE_FULL:
 219         case POWER_SUPPLY_PROP_ENERGY_FULL:
 220                 val->intval = battery->full_charge_capacity *
 221                         acpi_battery_scale(battery) * 1000;
 222                 break;
 223         case POWER_SUPPLY_PROP_CHARGE_NOW:
 224         case POWER_SUPPLY_PROP_ENERGY_NOW:
 225                 val->intval = battery->capacity_now *
 226                                 acpi_battery_scale(battery) * 1000;
 227                 break;
 228         case POWER_SUPPLY_PROP_TEMP:
 229                 val->intval = battery->temp_now - 2730; // dK -> dC
 230                 break;
 231         case POWER_SUPPLY_PROP_MODEL_NAME:
 232                 val->strval = battery->device_name;
 233                 break;
 234         case POWER_SUPPLY_PROP_MANUFACTURER:
 235                 val->strval = battery->manufacturer_name;
 236                 break;
 237         default:
 238                 return -EINVAL;
 239         }
 240         return 0;
 241 }
 242
 243 static const enum power_supply_property sbs_ac_props[] = {
 244         POWER_SUPPLY_PROP_ONLINE,
 245 };
 246
 247 static const enum power_supply_property sbs_charge_battery_props[] = {
 248         POWER_SUPPLY_PROP_STATUS,
 249         POWER_SUPPLY_PROP_PRESENT,
 250         POWER_SUPPLY_PROP_TECHNOLOGY,
 251         POWER_SUPPLY_PROP_CYCLE_COUNT,
 252         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 253         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 254         POWER_SUPPLY_PROP_CURRENT_NOW,
 255         POWER_SUPPLY_PROP_CURRENT_AVG,
 256         POWER_SUPPLY_PROP_CAPACITY,
 257         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 258         POWER_SUPPLY_PROP_CHARGE_FULL,
 259         POWER_SUPPLY_PROP_CHARGE_NOW,
 260         POWER_SUPPLY_PROP_TEMP,
 261         POWER_SUPPLY_PROP_MODEL_NAME,
 262         POWER_SUPPLY_PROP_MANUFACTURER,
 263 };
 264
 265 static const enum power_supply_property sbs_energy_battery_props[] = {
 266         POWER_SUPPLY_PROP_STATUS,
 267         POWER_SUPPLY_PROP_PRESENT,
 268         POWER_SUPPLY_PROP_TECHNOLOGY,
 269         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 270         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 271         POWER_SUPPLY_PROP_CURRENT_NOW,
 272         POWER_SUPPLY_PROP_CURRENT_AVG,
 273         POWER_SUPPLY_PROP_POWER_NOW,
 274         POWER_SUPPLY_PROP_POWER_AVG,
 275         POWER_SUPPLY_PROP_CAPACITY,
 276         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 277         POWER_SUPPLY_PROP_ENERGY_FULL,
 278         POWER_SUPPLY_PROP_ENERGY_NOW,
 279         POWER_SUPPLY_PROP_TEMP,
 280         POWER_SUPPLY_PROP_MODEL_NAME,
 281         POWER_SUPPLY_PROP_MANUFACTURER,
 282 };
 283
 284 static const struct power_supply_desc acpi_sbs_charger_desc = {
 285         .name           = "sbs-charger",
 286         .type           = POWER_SUPPLY_TYPE_MAINS,
 287         .properties     = sbs_ac_props,
 288         .num_properties = ARRAY_SIZE(sbs_ac_props),
 289         .get_property   = sbs_get_ac_property,
 290 };
 291
 292 /* --------------------------------------------------------------------------
 293                             Smart Battery System Management
 294    -------------------------------------------------------------------------- */
 295
 296 struct acpi_battery_reader {
 297         u8 command;             /* command for battery */
 298         u8 mode;                /* word or block? */
 299         size_t offset;          /* offset inside struct acpi_sbs_battery */
 300 };
 301
 302 static struct acpi_battery_reader info_readers[] = {
 303         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 304         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 305         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 306         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 307         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 308         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 309         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 310         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 311         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 312         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 313         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 314 };
 315
 316 static struct acpi_battery_reader state_readers[] = {
 317         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 318         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 319         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 320         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 321         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 322         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 323         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 324 };
 325
 326 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 327 {
 328         int result = 0;
 329         u16 battery_system_info;
 330
 331         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 332                                  0x04, (u8 *)&battery_system_info);
 333         if (!result)
 334                 sbs->batteries_supported = battery_system_info & 0x000f;
 335         return result;
 336 }
 337
 338 static int acpi_battery_get_info(struct acpi_battery *battery)
 339 {
 340         int i, result = 0;
 341
 342         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 343                 result = acpi_smbus_read(battery->sbs->hc,
 344                                          info_readers[i].mode,
 345                                          ACPI_SBS_BATTERY,
 346                                          info_readers[i].command,
 347                                          (u8 *) battery +
 348                                                 info_readers[i].offset);
 349                 if (result)
 350                         break;
 351         }
 352         return result;
 353 }
 354
 355 static int acpi_battery_get_state(struct acpi_battery *battery)
 356 {
 357         int i, result = 0;
 358
 359         if (battery->update_time &&
 360             time_before(jiffies, battery->update_time +
 361                                 msecs_to_jiffies(cache_time)))
 362                 return 0;
 363         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 364                 result = acpi_smbus_read(battery->sbs->hc,
 365                                          state_readers[i].mode,
 366                                          ACPI_SBS_BATTERY,
 367                                          state_readers[i].command,
 368                                          (u8 *)battery +
 369                                                 state_readers[i].offset);
 370                 if (result)
 371                         goto end;
 372         }
 373       end:
 374         battery->update_time = jiffies;
 375         return result;
 376 }
 377
 378 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 379 {
 380         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 381                                  ACPI_SBS_BATTERY, 0x01,
 382                                  (u8 *)&battery->alarm_capacity);
 383 }
 384
 385 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 386 {
 387         struct acpi_sbs *sbs = battery->sbs;
 388         u16 value, sel = 1 << (battery->id + 12);
 389
 390         int ret;
 391
 392
 393         if (sbs->manager_present) {
 394                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 395                                 0x01, (u8 *)&value);
 396                 if (ret)
 397                         goto end;
 398                 if ((value & 0xf000) != sel) {
 399                         value &= 0x0fff;
 400                         value |= sel;
 401                         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 402                                          ACPI_SBS_MANAGER,
 403                                          0x01, (u8 *)&value, 2);
 404                         if (ret)
 405                                 goto end;
 406                 }
 407         }
 408         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 409                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 410       end:
 411         return ret;
 412 }
 413
 414 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 415 {
 416         int result;
 417         u16 status;
 418
 419         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 420                                  0x13, (u8 *) & status);
 421
 422         if (result)
 423                 return result;
 424
 425         /*
 426          * The spec requires that bit 4 always be 1. If it's not set, assume
 427          * that the implementation doesn't support an SBS charger.
 428          *
 429          * And on some MacBooks a status of 0xffff is always returned, no
 430          * matter whether the charger is plugged in or not, which is also
 431          * wrong, so ignore the SBS charger for those too.
 432          */
 433         if (!((status >> 4) & 0x1) || status == 0xffff)
 434                 return -ENODEV;
 435
 436         sbs->charger_present = (status >> 15) & 0x1;
 437         return 0;
 438 }
 439
 440 static ssize_t acpi_battery_alarm_show(struct device *dev,
 441                                         struct device_attribute *attr,
 442                                         char *buf)
 443 {
 444         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 445         acpi_battery_get_alarm(battery);
 446         return sprintf(buf, "%d\n", battery->alarm_capacity *
 447                                 acpi_battery_scale(battery) * 1000);
 448 }
 449
 450 static ssize_t acpi_battery_alarm_store(struct device *dev,
 451                                         struct device_attribute *attr,
 452                                         const char *buf, size_t count)
 453 {
 454         unsigned long x;
 455         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 456         if (sscanf(buf, "%lu\n", &x) == 1)
 457                 battery->alarm_capacity = x /
 458                         (1000 * acpi_battery_scale(battery));
 459         if (battery->present)
 460                 acpi_battery_set_alarm(battery);
 461         return count;
 462 }
 463
 464 static struct device_attribute alarm_attr = {
 465         .attr = {.name = "alarm", .mode = 0644},
 466         .show = acpi_battery_alarm_show,
 467         .store = acpi_battery_alarm_store,
 468 };
 469
 470 static struct attribute *acpi_battery_attrs[] = {
 471         &alarm_attr.attr,
 472         NULL
 473 };
 474 ATTRIBUTE_GROUPS(acpi_battery);
 475
 476 /* --------------------------------------------------------------------------
 477                                  Driver Interface
 478    -------------------------------------------------------------------------- */
 479 static int acpi_battery_read(struct acpi_battery *battery)
 480 {
 481         int result, saved_present = battery->present;
 482         u16 state;
 483
 484         if (battery->sbs->manager_present) {
 485                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 486                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 487                 if (result)
 488                         return result;
 489
 490                 battery->present = state & (1 << battery->id);
 491                 if (!battery->present)
 492                         return 0;
 493
 494                 /* Masking necessary for Smart Battery Selectors */
 495                 state = 0x0fff;
 496                 state |= 1 << (battery->id + 12);
 497                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 498                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 499         } else {
 500                 if (battery->id == 0) {
 501                         battery->present = 1;
 502                 } else {
 503                         if (!battery->present)
 504                                 return 0;
 505                 }
 506         }
 507
 508         if (saved_present != battery->present) {
 509                 battery->update_time = 0;
 510                 result = acpi_battery_get_info(battery);
 511                 if (result) {
 512                         battery->present = 0;
 513                         return result;
 514                 }
 515         }
 516         result = acpi_battery_get_state(battery);
 517         if (result)
 518                 battery->present = 0;
 519         return result;
 520 }
 521
 522 /* Smart Battery */
 523 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 524 {
 525         struct acpi_battery *battery = &sbs->battery[id];
 526         struct power_supply_config psy_cfg = {
 527                 .drv_data = battery,
 528                 .attr_grp = acpi_battery_groups,
 529         };
 530         int result;
 531
 532         battery->id = id;
 533         battery->sbs = sbs;
 534         result = acpi_battery_read(battery);
 535         if (result)
 536                 return result;
 537
 538         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 539         battery->bat_desc.name = battery->name;
 540         battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 541         if (!acpi_battery_mode(battery)) {
 542                 battery->bat_desc.properties = sbs_charge_battery_props;
 543                 battery->bat_desc.num_properties =
 544                     ARRAY_SIZE(sbs_charge_battery_props);
 545         } else {
 546                 battery->bat_desc.properties = sbs_energy_battery_props;
 547                 battery->bat_desc.num_properties =
 548                     ARRAY_SIZE(sbs_energy_battery_props);
 549         }
 550         battery->bat_desc.get_property = acpi_sbs_battery_get_property;
 551         battery->bat = power_supply_register(&sbs->device->dev,
 552                                         &battery->bat_desc, &psy_cfg);
 553         if (IS_ERR(battery->bat)) {
 554                 result = PTR_ERR(battery->bat);
 555                 battery->bat = NULL;
 556                 goto end;
 557         }
 558
 559       end:
 560         pr_info("%s [%s]: Battery Slot [%s] (battery %s)\n",
 561                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 562                battery->name, battery->present ? "present" : "absent");
 563         return result;
 564 }
 565
 566 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 567 {
 568         struct acpi_battery *battery = &sbs->battery[id];
 569
 570         if (battery->bat)
 571                 power_supply_unregister(battery->bat);
 572 }
 573
 574 static int acpi_charger_add(struct acpi_sbs *sbs)
 575 {
 576         int result;
 577         struct power_supply_config psy_cfg = { .drv_data = sbs, };
 578
 579         result = acpi_ac_get_present(sbs);
 580         if (result)
 581                 goto end;
 582
 583         sbs->charger_exists = 1;
 584         sbs->charger = power_supply_register(&sbs->device->dev,
 585                                         &acpi_sbs_charger_desc, &psy_cfg);
 586         if (IS_ERR(sbs->charger)) {
 587                 result = PTR_ERR(sbs->charger);
 588                 sbs->charger = NULL;
 589         }
 590         pr_info("%s [%s]: AC Adapter [%s] (%s)\n",
 591                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 592                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 593 end:
 594         return result;
 595 }
 596
 597 static void acpi_charger_remove(struct acpi_sbs *sbs)
 598 {
 599         if (sbs->charger)
 600                 power_supply_unregister(sbs->charger);
 601 }
 602
 603 static void acpi_sbs_callback(void *context)
 604 {
 605         int id;
 606         struct acpi_sbs *sbs = context;
 607         struct acpi_battery *bat;
 608         u8 saved_charger_state = sbs->charger_present;
 609         u8 saved_battery_state;
 610
 611         if (sbs->charger_exists) {
 612                 acpi_ac_get_present(sbs);
 613                 if (sbs->charger_present != saved_charger_state)
 614                         power_supply_changed(sbs->charger);
 615         }
 616
 617         if (sbs->manager_present) {
 618                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 619                         if (!(sbs->batteries_supported & (1 << id)))
 620                                 continue;
 621                         bat = &sbs->battery[id];
 622                         saved_battery_state = bat->present;
 623                         acpi_battery_read(bat);
 624                         if (saved_battery_state == bat->present)
 625                                 continue;
 626                         power_supply_changed(bat->bat);
 627                 }
 628         }
 629 }
 630
 631 static int acpi_sbs_add(struct acpi_device *device)
 632 {
 633         struct acpi_sbs *sbs;
 634         int result = 0;
 635         int id;
 636
 637         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 638         if (!sbs) {
 639                 result = -ENOMEM;
 640                 goto end;
 641         }
 642
 643         mutex_init(&sbs->lock);
 644
 645         sbs->hc = acpi_driver_data(acpi_dev_parent(device));
 646         sbs->device = device;
 647         strscpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 648         strscpy(acpi_device_class(device), ACPI_SBS_CLASS);
 649         device->driver_data = sbs;
 650
 651         result = acpi_charger_add(sbs);
 652         if (result && result != -ENODEV)
 653                 goto end;
 654
 655         result = 0;
 656
 657         if (!x86_apple_machine) {
 658                 result = acpi_manager_get_info(sbs);
 659                 if (!result) {
 660                         sbs->manager_present = 1;
 661                         for (id = 0; id < MAX_SBS_BAT; ++id)
 662                                 if ((sbs->batteries_supported & (1 << id)))
 663                                         acpi_battery_add(sbs, id);
 664                 }
 665         }
 666
 667         if (!sbs->manager_present)
 668                 acpi_battery_add(sbs, 0);
 669
 670         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 671 end:
 672         if (result)
 673                 acpi_sbs_remove(device);
 674         return result;
 675 }
 676
 677 static void acpi_sbs_remove(struct acpi_device *device)
 678 {
 679         struct acpi_sbs *sbs;
 680         int id;
 681
 682         if (!device)
 683                 return;
 684         sbs = acpi_driver_data(device);
 685         if (!sbs)
 686                 return;
 687         mutex_lock(&sbs->lock);
 688         acpi_smbus_unregister_callback(sbs->hc);
 689         for (id = 0; id < MAX_SBS_BAT; ++id)
 690                 acpi_battery_remove(sbs, id);
 691         acpi_charger_remove(sbs);
 692         mutex_unlock(&sbs->lock);
 693         mutex_destroy(&sbs->lock);
 694         kfree(sbs);
 695 }
 696
 697 #ifdef CONFIG_PM_SLEEP
 698 static int acpi_sbs_resume(struct device *dev)
 699 {
 700         struct acpi_sbs *sbs;
 701         if (!dev)
 702                 return -EINVAL;
 703         sbs = to_acpi_device(dev)->driver_data;
 704         acpi_sbs_callback(sbs);
 705         return 0;
 706 }
 707 #else
 708 #define acpi_sbs_resume NULL
 709 #endif
 710
 711 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
 712
 713 static struct acpi_driver acpi_sbs_driver = {
 714         .name = "sbs",
 715         .class = ACPI_SBS_CLASS,
 716         .ids = sbs_device_ids,
 717         .ops = {
 718                 .add = acpi_sbs_add,
 719                 .remove = acpi_sbs_remove,
 720                 },
 721         .drv.pm = &acpi_sbs_pm,
 722 };
 723 module_acpi_driver(acpi_sbs_driver);