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