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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  21  */
  22
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/kernel.h>
  28
  29 #include <linux/acpi.h>
  30 #include <linux/timer.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/delay.h>
  33 #include <linux/power_supply.h>
  34 #include <linux/platform_data/x86/apple.h>
  35 #include <acpi/battery.h>
  36
  37 #include "sbshc.h"
  38
  39 #define PREFIX "ACPI: "
  40
  41 #define ACPI_SBS_CLASS                  "sbs"
  42 #define ACPI_AC_CLASS                   "ac_adapter"
  43 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  44 #define ACPI_SBS_FILE_INFO              "info"
  45 #define ACPI_SBS_FILE_STATE             "state"
  46 #define ACPI_SBS_FILE_ALARM             "alarm"
  47 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  48 #define ACPI_AC_DIR_NAME                "AC0"
  49
  50 #define ACPI_SBS_NOTIFY_STATUS          0x80
  51 #define ACPI_SBS_NOTIFY_INFO            0x81
  52
  53 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  54 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  55 MODULE_LICENSE("GPL");
  56
  57 static unsigned int cache_time = 1000;
  58 module_param(cache_time, uint, 0644);
  59 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  60
  61 #define MAX_SBS_BAT                     4
  62 #define ACPI_SBS_BLOCK_MAX              32
  63
  64 static const struct acpi_device_id sbs_device_ids[] = {
  65         {"ACPI0002", 0},
  66         {"", 0},
  67 };
  68 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  69
  70 struct acpi_battery {
  71         struct power_supply *bat;
  72         struct power_supply_desc bat_desc;
  73         struct acpi_sbs *sbs;
  74         unsigned long update_time;
  75         char name[8];
  76         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  77         char device_name[ACPI_SBS_BLOCK_MAX];
  78         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  79         u16 alarm_capacity;
  80         u16 full_charge_capacity;
  81         u16 design_capacity;
  82         u16 design_voltage;
  83         u16 serial_number;
  84         u16 cycle_count;
  85         u16 temp_now;
  86         u16 voltage_now;
  87         s16 rate_now;
  88         s16 rate_avg;
  89         u16 capacity_now;
  90         u16 state_of_charge;
  91         u16 state;
  92         u16 mode;
  93         u16 spec;
  94         u8 id;
  95         u8 present:1;
  96         u8 have_sysfs_alarm:1;
  97 };
  98
  99 #define to_acpi_battery(x) power_supply_get_drvdata(x)
 100
 101 struct acpi_sbs {
 102         struct power_supply *charger;
 103         struct acpi_device *device;
 104         struct acpi_smb_hc *hc;
 105         struct mutex lock;
 106         struct acpi_battery battery[MAX_SBS_BAT];
 107         u8 batteries_supported:4;
 108         u8 manager_present:1;
 109         u8 charger_present:1;
 110         u8 charger_exists:1;
 111 };
 112
 113 #define to_acpi_sbs(x) power_supply_get_drvdata(x)
 114
 115 static int acpi_sbs_remove(struct acpi_device *device);
 116 static int acpi_battery_get_state(struct acpi_battery *battery);
 117
 118 static inline int battery_scale(int log)
 119 {
 120         int scale = 1;
 121         while (log--)
 122                 scale *= 10;
 123         return scale;
 124 }
 125
 126 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 127 {
 128         return battery_scale((battery->spec & 0x0f00) >> 8);
 129 }
 130
 131 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 132 {
 133         return battery_scale((battery->spec & 0xf000) >> 12);
 134 }
 135
 136 static inline int acpi_battery_mode(struct acpi_battery *battery)
 137 {
 138         return (battery->mode & 0x8000);
 139 }
 140
 141 static inline int acpi_battery_scale(struct acpi_battery *battery)
 142 {
 143         return (acpi_battery_mode(battery) ? 10 : 1) *
 144             acpi_battery_ipscale(battery);
 145 }
 146
 147 static int sbs_get_ac_property(struct power_supply *psy,
 148                                enum power_supply_property psp,
 149                                union power_supply_propval *val)
 150 {
 151         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 152         switch (psp) {
 153         case POWER_SUPPLY_PROP_ONLINE:
 154                 val->intval = sbs->charger_present;
 155                 break;
 156         default:
 157                 return -EINVAL;
 158         }
 159         return 0;
 160 }
 161
 162 static int acpi_battery_technology(struct acpi_battery *battery)
 163 {
 164         if (!strcasecmp("NiCd", battery->device_chemistry))
 165                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 166         if (!strcasecmp("NiMH", battery->device_chemistry))
 167                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 168         if (!strcasecmp("LION", battery->device_chemistry))
 169                 return POWER_SUPPLY_TECHNOLOGY_LION;
 170         if (!strcasecmp("LiP", battery->device_chemistry))
 171                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 172         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 173 }
 174
 175 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 176                                          enum power_supply_property psp,
 177                                          union power_supply_propval *val)
 178 {
 179         struct acpi_battery *battery = to_acpi_battery(psy);
 180
 181         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 182                 return -ENODEV;
 183
 184         acpi_battery_get_state(battery);
 185         switch (psp) {
 186         case POWER_SUPPLY_PROP_STATUS:
 187                 if (battery->rate_now < 0)
 188                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 189                 else if (battery->rate_now > 0)
 190                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 191                 else
 192                         val->intval = POWER_SUPPLY_STATUS_FULL;
 193                 break;
 194         case POWER_SUPPLY_PROP_PRESENT:
 195                 val->intval = battery->present;
 196                 break;
 197         case POWER_SUPPLY_PROP_TECHNOLOGY:
 198                 val->intval = acpi_battery_technology(battery);
 199                 break;
 200         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 201                 val->intval = battery->cycle_count;
 202                 break;
 203         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 204                 val->intval = battery->design_voltage *
 205                         acpi_battery_vscale(battery) * 1000;
 206                 break;
 207         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 208                 val->intval = battery->voltage_now *
 209                                 acpi_battery_vscale(battery) * 1000;
 210                 break;
 211         case POWER_SUPPLY_PROP_CURRENT_NOW:
 212         case POWER_SUPPLY_PROP_POWER_NOW:
 213                 val->intval = abs(battery->rate_now) *
 214                                 acpi_battery_ipscale(battery) * 1000;
 215                 val->intval *= (acpi_battery_mode(battery)) ?
 216                                 (battery->voltage_now *
 217                                 acpi_battery_vscale(battery) / 1000) : 1;
 218                 break;
 219         case POWER_SUPPLY_PROP_CURRENT_AVG:
 220         case POWER_SUPPLY_PROP_POWER_AVG:
 221                 val->intval = abs(battery->rate_avg) *
 222                                 acpi_battery_ipscale(battery) * 1000;
 223                 val->intval *= (acpi_battery_mode(battery)) ?
 224                                 (battery->voltage_now *
 225                                 acpi_battery_vscale(battery) / 1000) : 1;
 226                 break;
 227         case POWER_SUPPLY_PROP_CAPACITY:
 228                 val->intval = battery->state_of_charge;
 229                 break;
 230         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 231         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 232                 val->intval = battery->design_capacity *
 233                         acpi_battery_scale(battery) * 1000;
 234                 break;
 235         case POWER_SUPPLY_PROP_CHARGE_FULL:
 236         case POWER_SUPPLY_PROP_ENERGY_FULL:
 237                 val->intval = battery->full_charge_capacity *
 238                         acpi_battery_scale(battery) * 1000;
 239                 break;
 240         case POWER_SUPPLY_PROP_CHARGE_NOW:
 241         case POWER_SUPPLY_PROP_ENERGY_NOW:
 242                 val->intval = battery->capacity_now *
 243                                 acpi_battery_scale(battery) * 1000;
 244                 break;
 245         case POWER_SUPPLY_PROP_TEMP:
 246                 val->intval = battery->temp_now - 2730; // dK -> dC
 247                 break;
 248         case POWER_SUPPLY_PROP_MODEL_NAME:
 249                 val->strval = battery->device_name;
 250                 break;
 251         case POWER_SUPPLY_PROP_MANUFACTURER:
 252                 val->strval = battery->manufacturer_name;
 253                 break;
 254         default:
 255                 return -EINVAL;
 256         }
 257         return 0;
 258 }
 259
 260 static enum power_supply_property sbs_ac_props[] = {
 261         POWER_SUPPLY_PROP_ONLINE,
 262 };
 263
 264 static enum power_supply_property sbs_charge_battery_props[] = {
 265         POWER_SUPPLY_PROP_STATUS,
 266         POWER_SUPPLY_PROP_PRESENT,
 267         POWER_SUPPLY_PROP_TECHNOLOGY,
 268         POWER_SUPPLY_PROP_CYCLE_COUNT,
 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_CAPACITY,
 274         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 275         POWER_SUPPLY_PROP_CHARGE_FULL,
 276         POWER_SUPPLY_PROP_CHARGE_NOW,
 277         POWER_SUPPLY_PROP_TEMP,
 278         POWER_SUPPLY_PROP_MODEL_NAME,
 279         POWER_SUPPLY_PROP_MANUFACTURER,
 280 };
 281
 282 static enum power_supply_property sbs_energy_battery_props[] = {
 283         POWER_SUPPLY_PROP_STATUS,
 284         POWER_SUPPLY_PROP_PRESENT,
 285         POWER_SUPPLY_PROP_TECHNOLOGY,
 286         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 287         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 288         POWER_SUPPLY_PROP_CURRENT_NOW,
 289         POWER_SUPPLY_PROP_CURRENT_AVG,
 290         POWER_SUPPLY_PROP_POWER_NOW,
 291         POWER_SUPPLY_PROP_POWER_AVG,
 292         POWER_SUPPLY_PROP_CAPACITY,
 293         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 294         POWER_SUPPLY_PROP_ENERGY_FULL,
 295         POWER_SUPPLY_PROP_ENERGY_NOW,
 296         POWER_SUPPLY_PROP_TEMP,
 297         POWER_SUPPLY_PROP_MODEL_NAME,
 298         POWER_SUPPLY_PROP_MANUFACTURER,
 299 };
 300
 301 static const struct power_supply_desc acpi_sbs_charger_desc = {
 302         .name           = "sbs-charger",
 303         .type           = POWER_SUPPLY_TYPE_MAINS,
 304         .properties     = sbs_ac_props,
 305         .num_properties = ARRAY_SIZE(sbs_ac_props),
 306         .get_property   = sbs_get_ac_property,
 307 };
 308
 309 /* --------------------------------------------------------------------------
 310                             Smart Battery System Management
 311    -------------------------------------------------------------------------- */
 312
 313 struct acpi_battery_reader {
 314         u8 command;             /* command for battery */
 315         u8 mode;                /* word or block? */
 316         size_t offset;          /* offset inside struct acpi_sbs_battery */
 317 };
 318
 319 static struct acpi_battery_reader info_readers[] = {
 320         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 321         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 322         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 323         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 324         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 325         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 326         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 327         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 328         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 329         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 330         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 331 };
 332
 333 static struct acpi_battery_reader state_readers[] = {
 334         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 335         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 336         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 337         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 338         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 339         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 340         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 341 };
 342
 343 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 344 {
 345         int result = 0;
 346         u16 battery_system_info;
 347
 348         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 349                                  0x04, (u8 *)&battery_system_info);
 350         if (!result)
 351                 sbs->batteries_supported = battery_system_info & 0x000f;
 352         return result;
 353 }
 354
 355 static int acpi_battery_get_info(struct acpi_battery *battery)
 356 {
 357         int i, result = 0;
 358
 359         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 360                 result = acpi_smbus_read(battery->sbs->hc,
 361                                          info_readers[i].mode,
 362                                          ACPI_SBS_BATTERY,
 363                                          info_readers[i].command,
 364                                          (u8 *) battery +
 365                                                 info_readers[i].offset);
 366                 if (result)
 367                         break;
 368         }
 369         return result;
 370 }
 371
 372 static int acpi_battery_get_state(struct acpi_battery *battery)
 373 {
 374         int i, result = 0;
 375
 376         if (battery->update_time &&
 377             time_before(jiffies, battery->update_time +
 378                                 msecs_to_jiffies(cache_time)))
 379                 return 0;
 380         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 381                 result = acpi_smbus_read(battery->sbs->hc,
 382                                          state_readers[i].mode,
 383                                          ACPI_SBS_BATTERY,
 384                                          state_readers[i].command,
 385                                          (u8 *)battery +
 386                                                 state_readers[i].offset);
 387                 if (result)
 388                         goto end;
 389         }
 390       end:
 391         battery->update_time = jiffies;
 392         return result;
 393 }
 394
 395 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 396 {
 397         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 398                                  ACPI_SBS_BATTERY, 0x01,
 399                                  (u8 *)&battery->alarm_capacity);
 400 }
 401
 402 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 403 {
 404         struct acpi_sbs *sbs = battery->sbs;
 405         u16 value, sel = 1 << (battery->id + 12);
 406
 407         int ret;
 408
 409
 410         if (sbs->manager_present) {
 411                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 412                                 0x01, (u8 *)&value);
 413                 if (ret)
 414                         goto end;
 415                 if ((value & 0xf000) != sel) {
 416                         value &= 0x0fff;
 417                         value |= sel;
 418                         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 419                                          ACPI_SBS_MANAGER,
 420                                          0x01, (u8 *)&value, 2);
 421                         if (ret)
 422                                 goto end;
 423                 }
 424         }
 425         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 426                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 427       end:
 428         return ret;
 429 }
 430
 431 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 432 {
 433         int result;
 434         u16 status;
 435
 436         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 437                                  0x13, (u8 *) & status);
 438
 439         if (result)
 440                 return result;
 441
 442         /*
 443          * The spec requires that bit 4 always be 1. If it's not set, assume
 444          * that the implementation doesn't support an SBS charger.
 445          *
 446          * And on some MacBooks a status of 0xffff is always returned, no
 447          * matter whether the charger is plugged in or not, which is also
 448          * wrong, so ignore the SBS charger for those too.
 449          */
 450         if (!((status >> 4) & 0x1) || status == 0xffff)
 451                 return -ENODEV;
 452
 453         sbs->charger_present = (status >> 15) & 0x1;
 454         return 0;
 455 }
 456
 457 static ssize_t acpi_battery_alarm_show(struct device *dev,
 458                                         struct device_attribute *attr,
 459                                         char *buf)
 460 {
 461         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 462         acpi_battery_get_alarm(battery);
 463         return sprintf(buf, "%d\n", battery->alarm_capacity *
 464                                 acpi_battery_scale(battery) * 1000);
 465 }
 466
 467 static ssize_t acpi_battery_alarm_store(struct device *dev,
 468                                         struct device_attribute *attr,
 469                                         const char *buf, size_t count)
 470 {
 471         unsigned long x;
 472         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 473         if (sscanf(buf, "%lu\n", &x) == 1)
 474                 battery->alarm_capacity = x /
 475                         (1000 * acpi_battery_scale(battery));
 476         if (battery->present)
 477                 acpi_battery_set_alarm(battery);
 478         return count;
 479 }
 480
 481 static const struct device_attribute alarm_attr = {
 482         .attr = {.name = "alarm", .mode = 0644},
 483         .show = acpi_battery_alarm_show,
 484         .store = acpi_battery_alarm_store,
 485 };
 486
 487 /* --------------------------------------------------------------------------
 488                                  Driver Interface
 489    -------------------------------------------------------------------------- */
 490 static int acpi_battery_read(struct acpi_battery *battery)
 491 {
 492         int result = 0, saved_present = battery->present;
 493         u16 state;
 494
 495         if (battery->sbs->manager_present) {
 496                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 497                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 498                 if (!result)
 499                         battery->present = state & (1 << battery->id);
 500                 state &= 0x0fff;
 501                 state |= 1 << (battery->id + 12);
 502                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 503                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 504         } else if (battery->id == 0)
 505                 battery->present = 1;
 506
 507         if (result || !battery->present)
 508                 return result;
 509
 510         if (saved_present != battery->present) {
 511                 battery->update_time = 0;
 512                 result = acpi_battery_get_info(battery);
 513                 if (result) {
 514                         battery->present = 0;
 515                         return result;
 516                 }
 517         }
 518         result = acpi_battery_get_state(battery);
 519         if (result)
 520                 battery->present = 0;
 521         return result;
 522 }
 523
 524 /* Smart Battery */
 525 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 526 {
 527         struct acpi_battery *battery = &sbs->battery[id];
 528         struct power_supply_config psy_cfg = { .drv_data = battery, };
 529         int result;
 530
 531         battery->id = id;
 532         battery->sbs = sbs;
 533         result = acpi_battery_read(battery);
 534         if (result)
 535                 return result;
 536
 537         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 538         battery->bat_desc.name = battery->name;
 539         battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 540         if (!acpi_battery_mode(battery)) {
 541                 battery->bat_desc.properties = sbs_charge_battery_props;
 542                 battery->bat_desc.num_properties =
 543                     ARRAY_SIZE(sbs_charge_battery_props);
 544         } else {
 545                 battery->bat_desc.properties = sbs_energy_battery_props;
 546                 battery->bat_desc.num_properties =
 547                     ARRAY_SIZE(sbs_energy_battery_props);
 548         }
 549         battery->bat_desc.get_property = acpi_sbs_battery_get_property;
 550         battery->bat = power_supply_register(&sbs->device->dev,
 551                                         &battery->bat_desc, &psy_cfg);
 552         if (IS_ERR(battery->bat)) {
 553                 result = PTR_ERR(battery->bat);
 554                 battery->bat = NULL;
 555                 goto end;
 556         }
 557
 558         result = device_create_file(&battery->bat->dev, &alarm_attr);
 559         if (result)
 560                 goto end;
 561         battery->have_sysfs_alarm = 1;
 562       end:
 563         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 564                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 565                battery->name, battery->present ? "present" : "absent");
 566         return result;
 567 }
 568
 569 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 570 {
 571         struct acpi_battery *battery = &sbs->battery[id];
 572
 573         if (battery->bat) {
 574                 if (battery->have_sysfs_alarm)
 575                         device_remove_file(&battery->bat->dev, &alarm_attr);
 576                 power_supply_unregister(battery->bat);
 577         }
 578 }
 579
 580 static int acpi_charger_add(struct acpi_sbs *sbs)
 581 {
 582         int result;
 583         struct power_supply_config psy_cfg = { .drv_data = sbs, };
 584
 585         result = acpi_ac_get_present(sbs);
 586         if (result)
 587                 goto end;
 588
 589         sbs->charger_exists = 1;
 590         sbs->charger = power_supply_register(&sbs->device->dev,
 591                                         &acpi_sbs_charger_desc, &psy_cfg);
 592         if (IS_ERR(sbs->charger)) {
 593                 result = PTR_ERR(sbs->charger);
 594                 sbs->charger = NULL;
 595         }
 596         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 597                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 598                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 599       end:
 600         return result;
 601 }
 602
 603 static void acpi_charger_remove(struct acpi_sbs *sbs)
 604 {
 605         if (sbs->charger)
 606                 power_supply_unregister(sbs->charger);
 607 }
 608
 609 static void acpi_sbs_callback(void *context)
 610 {
 611         int id;
 612         struct acpi_sbs *sbs = context;
 613         struct acpi_battery *bat;
 614         u8 saved_charger_state = sbs->charger_present;
 615         u8 saved_battery_state;
 616
 617         if (sbs->charger_exists) {
 618                 acpi_ac_get_present(sbs);
 619                 if (sbs->charger_present != saved_charger_state)
 620                         kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE);
 621         }
 622
 623         if (sbs->manager_present) {
 624                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 625                         if (!(sbs->batteries_supported & (1 << id)))
 626                                 continue;
 627                         bat = &sbs->battery[id];
 628                         saved_battery_state = bat->present;
 629                         acpi_battery_read(bat);
 630                         if (saved_battery_state == bat->present)
 631                                 continue;
 632                         kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE);
 633                 }
 634         }
 635 }
 636
 637 static int acpi_sbs_add(struct acpi_device *device)
 638 {
 639         struct acpi_sbs *sbs;
 640         int result = 0;
 641         int id;
 642
 643         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 644         if (!sbs) {
 645                 result = -ENOMEM;
 646                 goto end;
 647         }
 648
 649         mutex_init(&sbs->lock);
 650
 651         sbs->hc = acpi_driver_data(device->parent);
 652         sbs->device = device;
 653         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 654         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 655         device->driver_data = sbs;
 656
 657         result = acpi_charger_add(sbs);
 658         if (result && result != -ENODEV)
 659                 goto end;
 660
 661         result = 0;
 662
 663         if (!x86_apple_machine) {
 664                 result = acpi_manager_get_info(sbs);
 665                 if (!result) {
 666                         sbs->manager_present = 1;
 667                         for (id = 0; id < MAX_SBS_BAT; ++id)
 668                                 if ((sbs->batteries_supported & (1 << id)))
 669                                         acpi_battery_add(sbs, id);
 670                 }
 671         }
 672
 673         if (!sbs->manager_present)
 674                 acpi_battery_add(sbs, 0);
 675
 676         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 677       end:
 678         if (result)
 679                 acpi_sbs_remove(device);
 680         return result;
 681 }
 682
 683 static int acpi_sbs_remove(struct acpi_device *device)
 684 {
 685         struct acpi_sbs *sbs;
 686         int id;
 687
 688         if (!device)
 689                 return -EINVAL;
 690         sbs = acpi_driver_data(device);
 691         if (!sbs)
 692                 return -EINVAL;
 693         mutex_lock(&sbs->lock);
 694         acpi_smbus_unregister_callback(sbs->hc);
 695         for (id = 0; id < MAX_SBS_BAT; ++id)
 696                 acpi_battery_remove(sbs, id);
 697         acpi_charger_remove(sbs);
 698         mutex_unlock(&sbs->lock);
 699         mutex_destroy(&sbs->lock);
 700         kfree(sbs);
 701         return 0;
 702 }
 703
 704 #ifdef CONFIG_PM_SLEEP
 705 static int acpi_sbs_resume(struct device *dev)
 706 {
 707         struct acpi_sbs *sbs;
 708         if (!dev)
 709                 return -EINVAL;
 710         sbs = to_acpi_device(dev)->driver_data;
 711         acpi_sbs_callback(sbs);
 712         return 0;
 713 }
 714 #else
 715 #define acpi_sbs_resume NULL
 716 #endif
 717
 718 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
 719
 720 static struct acpi_driver acpi_sbs_driver = {
 721         .name = "sbs",
 722         .class = ACPI_SBS_CLASS,
 723         .ids = sbs_device_ids,
 724         .ops = {
 725                 .add = acpi_sbs_add,
 726                 .remove = acpi_sbs_remove,
 727                 },
 728         .drv.pm = &acpi_sbs_pm,
 729 };
 730
 731 static int __init acpi_sbs_init(void)
 732 {
 733         int result = 0;
 734
 735         if (acpi_disabled)
 736                 return -ENODEV;
 737
 738         result = acpi_bus_register_driver(&acpi_sbs_driver);
 739         if (result < 0)
 740                 return -ENODEV;
 741
 742         return 0;
 743 }
 744
 745 static void __exit acpi_sbs_exit(void)
 746 {
 747         acpi_bus_unregister_driver(&acpi_sbs_driver);
 748         return;
 749 }
 750
 751 module_init(acpi_sbs_init);
 752 module_exit(acpi_sbs_exit);