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          * And on some MacBooks a status of 0xffff is always returned, no
 449          * matter whether the charger is plugged in or not, which is also
 450          * wrong, so ignore the SBS charger for those too.
 451          */
 452         if (!((status >> 4) & 0x1) || status == 0xffff)
 453                 return -ENODEV;
 454
 455         sbs->charger_present = (status >> 15) & 0x1;
 456         return 0;
 457 }
 458
 459 static ssize_t acpi_battery_alarm_show(struct device *dev,
 460                                         struct device_attribute *attr,
 461                                         char *buf)
 462 {
 463         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 464         acpi_battery_get_alarm(battery);
 465         return sprintf(buf, "%d\n", battery->alarm_capacity *
 466                                 acpi_battery_scale(battery) * 1000);
 467 }
 468
 469 static ssize_t acpi_battery_alarm_store(struct device *dev,
 470                                         struct device_attribute *attr,
 471                                         const char *buf, size_t count)
 472 {
 473         unsigned long x;
 474         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 475         if (sscanf(buf, "%lu\n", &x) == 1)
 476                 battery->alarm_capacity = x /
 477                         (1000 * acpi_battery_scale(battery));
 478         if (battery->present)
 479                 acpi_battery_set_alarm(battery);
 480         return count;
 481 }
 482
 483 static struct device_attribute alarm_attr = {
 484         .attr = {.name = "alarm", .mode = 0644},
 485         .show = acpi_battery_alarm_show,
 486         .store = acpi_battery_alarm_store,
 487 };
 488
 489 /* --------------------------------------------------------------------------
 490                                  Driver Interface
 491    -------------------------------------------------------------------------- */
 492 static int acpi_battery_read(struct acpi_battery *battery)
 493 {
 494         int result = 0, saved_present = battery->present;
 495         u16 state;
 496
 497         if (battery->sbs->manager_present) {
 498                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 499                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 500                 if (!result)
 501                         battery->present = state & (1 << battery->id);
 502                 state &= 0x0fff;
 503                 state |= 1 << (battery->id + 12);
 504                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 505                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 506         } else if (battery->id == 0)
 507                 battery->present = 1;
 508
 509         if (result || !battery->present)
 510                 return result;
 511
 512         if (saved_present != battery->present) {
 513                 battery->update_time = 0;
 514                 result = acpi_battery_get_info(battery);
 515                 if (result) {
 516                         battery->present = 0;
 517                         return result;
 518                 }
 519         }
 520         result = acpi_battery_get_state(battery);
 521         if (result)
 522                 battery->present = 0;
 523         return result;
 524 }
 525
 526 /* Smart Battery */
 527 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 528 {
 529         struct acpi_battery *battery = &sbs->battery[id];
 530         struct power_supply_config psy_cfg = { .drv_data = battery, };
 531         int result;
 532
 533         battery->id = id;
 534         battery->sbs = sbs;
 535         result = acpi_battery_read(battery);
 536         if (result)
 537                 return result;
 538
 539         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 540         battery->bat_desc.name = battery->name;
 541         battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 542         if (!acpi_battery_mode(battery)) {
 543                 battery->bat_desc.properties = sbs_charge_battery_props;
 544                 battery->bat_desc.num_properties =
 545                     ARRAY_SIZE(sbs_charge_battery_props);
 546         } else {
 547                 battery->bat_desc.properties = sbs_energy_battery_props;
 548                 battery->bat_desc.num_properties =
 549                     ARRAY_SIZE(sbs_energy_battery_props);
 550         }
 551         battery->bat_desc.get_property = acpi_sbs_battery_get_property;
 552         battery->bat = power_supply_register(&sbs->device->dev,
 553                                         &battery->bat_desc, &psy_cfg);
 554         if (IS_ERR(battery->bat)) {
 555                 result = PTR_ERR(battery->bat);
 556                 battery->bat = NULL;
 557                 goto end;
 558         }
 559
 560         result = device_create_file(&battery->bat->dev, &alarm_attr);
 561         if (result)
 562                 goto end;
 563         battery->have_sysfs_alarm = 1;
 564       end:
 565         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 566                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 567                battery->name, battery->present ? "present" : "absent");
 568         return result;
 569 }
 570
 571 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 572 {
 573         struct acpi_battery *battery = &sbs->battery[id];
 574
 575         if (battery->bat) {
 576                 if (battery->have_sysfs_alarm)
 577                         device_remove_file(&battery->bat->dev, &alarm_attr);
 578                 power_supply_unregister(battery->bat);
 579         }
 580 }
 581
 582 static int acpi_charger_add(struct acpi_sbs *sbs)
 583 {
 584         int result;
 585         struct power_supply_config psy_cfg = { .drv_data = sbs, };
 586
 587         result = acpi_ac_get_present(sbs);
 588         if (result)
 589                 goto end;
 590
 591         sbs->charger_exists = 1;
 592         sbs->charger = power_supply_register(&sbs->device->dev,
 593                                         &acpi_sbs_charger_desc, &psy_cfg);
 594         if (IS_ERR(sbs->charger)) {
 595                 result = PTR_ERR(sbs->charger);
 596                 sbs->charger = NULL;
 597         }
 598         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 599                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 600                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 601       end:
 602         return result;
 603 }
 604
 605 static void acpi_charger_remove(struct acpi_sbs *sbs)
 606 {
 607         if (sbs->charger)
 608                 power_supply_unregister(sbs->charger);
 609 }
 610
 611 static void acpi_sbs_callback(void *context)
 612 {
 613         int id;
 614         struct acpi_sbs *sbs = context;
 615         struct acpi_battery *bat;
 616         u8 saved_charger_state = sbs->charger_present;
 617         u8 saved_battery_state;
 618
 619         if (sbs->charger_exists) {
 620                 acpi_ac_get_present(sbs);
 621                 if (sbs->charger_present != saved_charger_state)
 622                         kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE);
 623         }
 624
 625         if (sbs->manager_present) {
 626                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 627                         if (!(sbs->batteries_supported & (1 << id)))
 628                                 continue;
 629                         bat = &sbs->battery[id];
 630                         saved_battery_state = bat->present;
 631                         acpi_battery_read(bat);
 632                         if (saved_battery_state == bat->present)
 633                                 continue;
 634                         kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE);
 635                 }
 636         }
 637 }
 638
 639 static int disable_sbs_manager(const struct dmi_system_id *d)
 640 {
 641         sbs_manager_broken = true;
 642         return 0;
 643 }
 644
 645 static struct dmi_system_id acpi_sbs_dmi_table[] = {
 646         {
 647                 .callback = disable_sbs_manager,
 648                 .ident = "Apple",
 649                 .matches = {
 650                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc.")
 651                 },
 652         },
 653         { },
 654 };
 655
 656 static int acpi_sbs_add(struct acpi_device *device)
 657 {
 658         struct acpi_sbs *sbs;
 659         int result = 0;
 660         int id;
 661
 662         dmi_check_system(acpi_sbs_dmi_table);
 663
 664         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 665         if (!sbs) {
 666                 result = -ENOMEM;
 667                 goto end;
 668         }
 669
 670         mutex_init(&sbs->lock);
 671
 672         sbs->hc = acpi_driver_data(device->parent);
 673         sbs->device = device;
 674         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 675         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 676         device->driver_data = sbs;
 677
 678         result = acpi_charger_add(sbs);
 679         if (result && result != -ENODEV)
 680                 goto end;
 681
 682         result = 0;
 683
 684         if (!sbs_manager_broken) {
 685                 result = acpi_manager_get_info(sbs);
 686                 if (!result) {
 687                         sbs->manager_present = 1;
 688                         for (id = 0; id < MAX_SBS_BAT; ++id)
 689                                 if ((sbs->batteries_supported & (1 << id)))
 690                                         acpi_battery_add(sbs, id);
 691                 }
 692         }
 693
 694         if (!sbs->manager_present)
 695                 acpi_battery_add(sbs, 0);
 696
 697         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 698       end:
 699         if (result)
 700                 acpi_sbs_remove(device);
 701         return result;
 702 }
 703
 704 static int acpi_sbs_remove(struct acpi_device *device)
 705 {
 706         struct acpi_sbs *sbs;
 707         int id;
 708
 709         if (!device)
 710                 return -EINVAL;
 711         sbs = acpi_driver_data(device);
 712         if (!sbs)
 713                 return -EINVAL;
 714         mutex_lock(&sbs->lock);
 715         acpi_smbus_unregister_callback(sbs->hc);
 716         for (id = 0; id < MAX_SBS_BAT; ++id)
 717                 acpi_battery_remove(sbs, id);
 718         acpi_charger_remove(sbs);
 719         mutex_unlock(&sbs->lock);
 720         mutex_destroy(&sbs->lock);
 721         kfree(sbs);
 722         return 0;
 723 }
 724
 725 #ifdef CONFIG_PM_SLEEP
 726 static int acpi_sbs_resume(struct device *dev)
 727 {
 728         struct acpi_sbs *sbs;
 729         if (!dev)
 730                 return -EINVAL;
 731         sbs = to_acpi_device(dev)->driver_data;
 732         acpi_sbs_callback(sbs);
 733         return 0;
 734 }
 735 #else
 736 #define acpi_sbs_resume NULL
 737 #endif
 738
 739 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
 740
 741 static struct acpi_driver acpi_sbs_driver = {
 742         .name = "sbs",
 743         .class = ACPI_SBS_CLASS,
 744         .ids = sbs_device_ids,
 745         .ops = {
 746                 .add = acpi_sbs_add,
 747                 .remove = acpi_sbs_remove,
 748                 },
 749         .drv.pm = &acpi_sbs_pm,
 750 };
 751
 752 static int __init acpi_sbs_init(void)
 753 {
 754         int result = 0;
 755
 756         if (acpi_disabled)
 757                 return -ENODEV;
 758
 759         result = acpi_bus_register_driver(&acpi_sbs_driver);
 760         if (result < 0)
 761                 return -ENODEV;
 762
 763         return 0;
 764 }
 765
 766 static void __exit acpi_sbs_exit(void)
 767 {
 768         acpi_bus_unregister_driver(&acpi_sbs_driver);
 769         return;
 770 }
 771
 772 module_init(acpi_sbs_init);
 773 module_exit(acpi_sbs_exit);