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/dmi.h>
  35
  36 #include "sbshc.h"
  37 #include "battery.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 static bool sbs_manager_broken;
  62
  63 #define MAX_SBS_BAT                     4
  64 #define ACPI_SBS_BLOCK_MAX              32
  65
  66 static const struct acpi_device_id sbs_device_ids[] = {
  67         {"ACPI0002", 0},
  68         {"", 0},
  69 };
  70 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  71
  72 struct acpi_battery {
  73         struct power_supply *bat;
  74         struct power_supply_desc bat_desc;
  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) power_supply_get_drvdata(x)
 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) power_supply_get_drvdata(x)
 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 static const struct power_supply_desc acpi_sbs_charger_desc = {
 304         .name           = "sbs-charger",
 305         .type           = POWER_SUPPLY_TYPE_MAINS,
 306         .properties     = sbs_ac_props,
 307         .num_properties = ARRAY_SIZE(sbs_ac_props),
 308         .get_property   = sbs_get_ac_property,
 309 };
 310
 311 /* --------------------------------------------------------------------------
 312                             Smart Battery System Management
 313    -------------------------------------------------------------------------- */
 314
 315 struct acpi_battery_reader {
 316         u8 command;             /* command for battery */
 317         u8 mode;                /* word or block? */
 318         size_t offset;          /* offset inside struct acpi_sbs_battery */
 319 };
 320
 321 static struct acpi_battery_reader info_readers[] = {
 322         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 323         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 324         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 325         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 326         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 327         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 328         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 329         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 330         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 331         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 332         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 333 };
 334
 335 static struct acpi_battery_reader state_readers[] = {
 336         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 337         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 338         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 339         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 340         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 341         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 342         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 343 };
 344
 345 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 346 {
 347         int result = 0;
 348         u16 battery_system_info;
 349
 350         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 351                                  0x04, (u8 *)&battery_system_info);
 352         if (!result)
 353                 sbs->batteries_supported = battery_system_info & 0x000f;
 354         return result;
 355 }
 356
 357 static int acpi_battery_get_info(struct acpi_battery *battery)
 358 {
 359         int i, result = 0;
 360
 361         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 362                 result = acpi_smbus_read(battery->sbs->hc,
 363                                          info_readers[i].mode,
 364                                          ACPI_SBS_BATTERY,
 365                                          info_readers[i].command,
 366                                          (u8 *) battery +
 367                                                 info_readers[i].offset);
 368                 if (result)
 369                         break;
 370         }
 371         return result;
 372 }
 373
 374 static int acpi_battery_get_state(struct acpi_battery *battery)
 375 {
 376         int i, result = 0;
 377
 378         if (battery->update_time &&
 379             time_before(jiffies, battery->update_time +
 380                                 msecs_to_jiffies(cache_time)))
 381                 return 0;
 382         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 383                 result = acpi_smbus_read(battery->sbs->hc,
 384                                          state_readers[i].mode,
 385                                          ACPI_SBS_BATTERY,
 386                                          state_readers[i].command,
 387                                          (u8 *)battery +
 388                                                 state_readers[i].offset);
 389                 if (result)
 390                         goto end;
 391         }
 392       end:
 393         battery->update_time = jiffies;
 394         return result;
 395 }
 396
 397 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 398 {
 399         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 400                                  ACPI_SBS_BATTERY, 0x01,
 401                                  (u8 *)&battery->alarm_capacity);
 402 }
 403
 404 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 405 {
 406         struct acpi_sbs *sbs = battery->sbs;
 407         u16 value, sel = 1 << (battery->id + 12);
 408
 409         int ret;
 410
 411
 412         if (sbs->manager_present) {
 413                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 414                                 0x01, (u8 *)&value);
 415                 if (ret)
 416                         goto end;
 417                 if ((value & 0xf000) != sel) {
 418                         value &= 0x0fff;
 419                         value |= sel;
 420                         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 421                                          ACPI_SBS_MANAGER,
 422                                          0x01, (u8 *)&value, 2);
 423                         if (ret)
 424                                 goto end;
 425                 }
 426         }
 427         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 428                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 429       end:
 430         return ret;
 431 }
 432
 433 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 434 {
 435         int result;
 436         u16 status;
 437
 438         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 439                                  0x13, (u8 *) & status);
 440
 441         if (result)
 442                 return result;
 443
 444         /*
 445          * The spec requires that bit 4 always be 1. If it's not set, assume
 446          * that the implementation doesn't support an SBS charger
 447          */
 448         if (!((status >> 4) & 0x1))
 449                 return -ENODEV;
 450
 451         sbs->charger_present = (status >> 15) & 0x1;
 452         return 0;
 453 }
 454
 455 static ssize_t acpi_battery_alarm_show(struct device *dev,
 456                                         struct device_attribute *attr,
 457                                         char *buf)
 458 {
 459         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 460         acpi_battery_get_alarm(battery);
 461         return sprintf(buf, "%d\n", battery->alarm_capacity *
 462                                 acpi_battery_scale(battery) * 1000);
 463 }
 464
 465 static ssize_t acpi_battery_alarm_store(struct device *dev,
 466                                         struct device_attribute *attr,
 467                                         const char *buf, size_t count)
 468 {
 469         unsigned long x;
 470         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 471         if (sscanf(buf, "%lu\n", &x) == 1)
 472                 battery->alarm_capacity = x /
 473                         (1000 * acpi_battery_scale(battery));
 474         if (battery->present)
 475                 acpi_battery_set_alarm(battery);
 476         return count;
 477 }
 478
 479 static struct device_attribute alarm_attr = {
 480         .attr = {.name = "alarm", .mode = 0644},
 481         .show = acpi_battery_alarm_show,
 482         .store = acpi_battery_alarm_store,
 483 };
 484
 485 /* --------------------------------------------------------------------------
 486                                  Driver Interface
 487    -------------------------------------------------------------------------- */
 488 static int acpi_battery_read(struct acpi_battery *battery)
 489 {
 490         int result = 0, saved_present = battery->present;
 491         u16 state;
 492
 493         if (battery->sbs->manager_present) {
 494                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 495                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 496                 if (!result)
 497                         battery->present = state & (1 << battery->id);
 498                 state &= 0x0fff;
 499                 state |= 1 << (battery->id + 12);
 500                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 501                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 502         } else if (battery->id == 0)
 503                 battery->present = 1;
 504
 505         if (result || !battery->present)
 506                 return result;
 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 = { .drv_data = battery, };
 527         int result;
 528
 529         battery->id = id;
 530         battery->sbs = sbs;
 531         result = acpi_battery_read(battery);
 532         if (result)
 533                 return result;
 534
 535         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 536         battery->bat_desc.name = battery->name;
 537         battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 538         if (!acpi_battery_mode(battery)) {
 539                 battery->bat_desc.properties = sbs_charge_battery_props;
 540                 battery->bat_desc.num_properties =
 541                     ARRAY_SIZE(sbs_charge_battery_props);
 542         } else {
 543                 battery->bat_desc.properties = sbs_energy_battery_props;
 544                 battery->bat_desc.num_properties =
 545                     ARRAY_SIZE(sbs_energy_battery_props);
 546         }
 547         battery->bat_desc.get_property = acpi_sbs_battery_get_property;
 548         battery->bat = power_supply_register(&sbs->device->dev,
 549                                         &battery->bat_desc, &psy_cfg);
 550         if (IS_ERR(battery->bat)) {
 551                 result = PTR_ERR(battery->bat);
 552                 battery->bat = NULL;
 553                 goto end;
 554         }
 555
 556         result = device_create_file(&battery->bat->dev, &alarm_attr);
 557         if (result)
 558                 goto end;
 559         battery->have_sysfs_alarm = 1;
 560       end:
 561         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 562                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 563                battery->name, battery->present ? "present" : "absent");
 564         return result;
 565 }
 566
 567 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 568 {
 569         struct acpi_battery *battery = &sbs->battery[id];
 570
 571         if (battery->bat) {
 572                 if (battery->have_sysfs_alarm)
 573                         device_remove_file(&battery->bat->dev, &alarm_attr);
 574                 power_supply_unregister(battery->bat);
 575         }
 576 }
 577
 578 static int acpi_charger_add(struct acpi_sbs *sbs)
 579 {
 580         int result;
 581         struct power_supply_config psy_cfg = { .drv_data = sbs, };
 582
 583         result = acpi_ac_get_present(sbs);
 584         if (result)
 585                 goto end;
 586
 587         sbs->charger_exists = 1;
 588         sbs->charger = power_supply_register(&sbs->device->dev,
 589                                         &acpi_sbs_charger_desc, &psy_cfg);
 590         if (IS_ERR(sbs->charger)) {
 591                 result = PTR_ERR(sbs->charger);
 592                 sbs->charger = NULL;
 593         }
 594         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 595                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 596                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 597       end:
 598         return result;
 599 }
 600
 601 static void acpi_charger_remove(struct acpi_sbs *sbs)
 602 {
 603         if (sbs->charger)
 604                 power_supply_unregister(sbs->charger);
 605 }
 606
 607 static void acpi_sbs_callback(void *context)
 608 {
 609         int id;
 610         struct acpi_sbs *sbs = context;
 611         struct acpi_battery *bat;
 612         u8 saved_charger_state = sbs->charger_present;
 613         u8 saved_battery_state;
 614
 615         if (sbs->charger_exists) {
 616                 acpi_ac_get_present(sbs);
 617                 if (sbs->charger_present != saved_charger_state)
 618                         kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE);
 619         }
 620
 621         if (sbs->manager_present) {
 622                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 623                         if (!(sbs->batteries_supported & (1 << id)))
 624                                 continue;
 625                         bat = &sbs->battery[id];
 626                         saved_battery_state = bat->present;
 627                         acpi_battery_read(bat);
 628                         if (saved_battery_state == bat->present)
 629                                 continue;
 630                         kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE);
 631                 }
 632         }
 633 }
 634
 635 static int disable_sbs_manager(const struct dmi_system_id *d)
 636 {
 637         sbs_manager_broken = true;
 638         return 0;
 639 }
 640
 641 static struct dmi_system_id acpi_sbs_dmi_table[] = {
 642         {
 643                 .callback = disable_sbs_manager,
 644                 .ident = "Apple",
 645                 .matches = {
 646                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc.")
 647                 },
 648         },
 649         { },
 650 };
 651
 652 static int acpi_sbs_add(struct acpi_device *device)
 653 {
 654         struct acpi_sbs *sbs;
 655         int result = 0;
 656         int id;
 657
 658         dmi_check_system(acpi_sbs_dmi_table);
 659
 660         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 661         if (!sbs) {
 662                 result = -ENOMEM;
 663                 goto end;
 664         }
 665
 666         mutex_init(&sbs->lock);
 667
 668         sbs->hc = acpi_driver_data(device->parent);
 669         sbs->device = device;
 670         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 671         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 672         device->driver_data = sbs;
 673
 674         result = acpi_charger_add(sbs);
 675         if (result && result != -ENODEV)
 676                 goto end;
 677
 678         result = 0;
 679
 680         if (!sbs_manager_broken) {
 681                 result = acpi_manager_get_info(sbs);
 682                 if (!result) {
 683                         sbs->manager_present = 1;
 684                         for (id = 0; id < MAX_SBS_BAT; ++id)
 685                                 if ((sbs->batteries_supported & (1 << id)))
 686                                         acpi_battery_add(sbs, id);
 687                 }
 688         }
 689
 690         if (!sbs->manager_present)
 691                 acpi_battery_add(sbs, 0);
 692
 693         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 694       end:
 695         if (result)
 696                 acpi_sbs_remove(device);
 697         return result;
 698 }
 699
 700 static int acpi_sbs_remove(struct acpi_device *device)
 701 {
 702         struct acpi_sbs *sbs;
 703         int id;
 704
 705         if (!device)
 706                 return -EINVAL;
 707         sbs = acpi_driver_data(device);
 708         if (!sbs)
 709                 return -EINVAL;
 710         mutex_lock(&sbs->lock);
 711         acpi_smbus_unregister_callback(sbs->hc);
 712         for (id = 0; id < MAX_SBS_BAT; ++id)
 713                 acpi_battery_remove(sbs, id);
 714         acpi_charger_remove(sbs);
 715         mutex_unlock(&sbs->lock);
 716         mutex_destroy(&sbs->lock);
 717         kfree(sbs);
 718         return 0;
 719 }
 720
 721 #ifdef CONFIG_PM_SLEEP
 722 static int acpi_sbs_resume(struct device *dev)
 723 {
 724         struct acpi_sbs *sbs;
 725         if (!dev)
 726                 return -EINVAL;
 727         sbs = to_acpi_device(dev)->driver_data;
 728         acpi_sbs_callback(sbs);
 729         return 0;
 730 }
 731 #else
 732 #define acpi_sbs_resume NULL
 733 #endif
 734
 735 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
 736
 737 static struct acpi_driver acpi_sbs_driver = {
 738         .name = "sbs",
 739         .class = ACPI_SBS_CLASS,
 740         .ids = sbs_device_ids,
 741         .ops = {
 742                 .add = acpi_sbs_add,
 743                 .remove = acpi_sbs_remove,
 744                 },
 745         .drv.pm = &acpi_sbs_pm,
 746 };
 747
 748 static int __init acpi_sbs_init(void)
 749 {
 750         int result = 0;
 751
 752         if (acpi_disabled)
 753                 return -ENODEV;
 754
 755         result = acpi_bus_register_driver(&acpi_sbs_driver);
 756         if (result < 0)
 757                 return -ENODEV;
 758
 759         return 0;
 760 }
 761
 762 static void __exit acpi_sbs_exit(void)
 763 {
 764         acpi_bus_unregister_driver(&acpi_sbs_driver);
 765         return;
 766 }
 767
 768 module_init(acpi_sbs_init);
 769 module_exit(acpi_sbs_exit);