kernel/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  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  23  *
  24  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/module.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/kernel.h>
  32
  33 #include <linux/acpi.h>
  34 #include <linux/timer.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/delay.h>
  37 #include <linux/power_supply.h>
  38 #include <linux/dmi.h>
  39
  40 #include "sbshc.h"
  41 #include "battery.h"
  42
  43 #define PREFIX "ACPI: "
  44
  45 #define ACPI_SBS_CLASS                  "sbs"
  46 #define ACPI_AC_CLASS                   "ac_adapter"
  47 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  48 #define ACPI_SBS_FILE_INFO              "info"
  49 #define ACPI_SBS_FILE_STATE             "state"
  50 #define ACPI_SBS_FILE_ALARM             "alarm"
  51 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  52 #define ACPI_AC_DIR_NAME                "AC0"
  53
  54 #define ACPI_SBS_NOTIFY_STATUS          0x80
  55 #define ACPI_SBS_NOTIFY_INFO            0x81
  56
  57 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  58 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  59 MODULE_LICENSE("GPL");
  60
  61 static unsigned int cache_time = 1000;
  62 module_param(cache_time, uint, 0644);
  63 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  64
  65 static bool sbs_manager_broken;
  66
  67 #define MAX_SBS_BAT                     4
  68 #define ACPI_SBS_BLOCK_MAX              32
  69
  70 static const struct acpi_device_id sbs_device_ids[] = {
  71         {"ACPI0002", 0},
  72         {"", 0},
  73 };
  74 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  75
  76 struct acpi_battery {
  77         struct power_supply *bat;
  78         struct power_supply_desc bat_desc;
  79         struct acpi_sbs *sbs;
  80         unsigned long update_time;
  81         char name[8];
  82         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  83         char device_name[ACPI_SBS_BLOCK_MAX];
  84         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  85         u16 alarm_capacity;
  86         u16 full_charge_capacity;
  87         u16 design_capacity;
  88         u16 design_voltage;
  89         u16 serial_number;
  90         u16 cycle_count;
  91         u16 temp_now;
  92         u16 voltage_now;
  93         s16 rate_now;
  94         s16 rate_avg;
  95         u16 capacity_now;
  96         u16 state_of_charge;
  97         u16 state;
  98         u16 mode;
  99         u16 spec;
 100         u8 id;
 101         u8 present:1;
 102         u8 have_sysfs_alarm:1;
 103 };
 104
 105 #define to_acpi_battery(x) power_supply_get_drvdata(x)
 106
 107 struct acpi_sbs {
 108         struct power_supply *charger;
 109         struct acpi_device *device;
 110         struct acpi_smb_hc *hc;
 111         struct mutex lock;
 112         struct acpi_battery battery[MAX_SBS_BAT];
 113         u8 batteries_supported:4;
 114         u8 manager_present:1;
 115         u8 charger_present:1;
 116         u8 charger_exists:1;
 117 };
 118
 119 #define to_acpi_sbs(x) power_supply_get_drvdata(x)
 120
 121 static int acpi_sbs_remove(struct acpi_device *device);
 122 static int acpi_battery_get_state(struct acpi_battery *battery);
 123
 124 static inline int battery_scale(int log)
 125 {
 126         int scale = 1;
 127         while (log--)
 128                 scale *= 10;
 129         return scale;
 130 }
 131
 132 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 133 {
 134         return battery_scale((battery->spec & 0x0f00) >> 8);
 135 }
 136
 137 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 138 {
 139         return battery_scale((battery->spec & 0xf000) >> 12);
 140 }
 141
 142 static inline int acpi_battery_mode(struct acpi_battery *battery)
 143 {
 144         return (battery->mode & 0x8000);
 145 }
 146
 147 static inline int acpi_battery_scale(struct acpi_battery *battery)
 148 {
 149         return (acpi_battery_mode(battery) ? 10 : 1) *
 150             acpi_battery_ipscale(battery);
 151 }
 152
 153 static int sbs_get_ac_property(struct power_supply *psy,
 154                                enum power_supply_property psp,
 155                                union power_supply_propval *val)
 156 {
 157         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 158         switch (psp) {
 159         case POWER_SUPPLY_PROP_ONLINE:
 160                 val->intval = sbs->charger_present;
 161                 break;
 162         default:
 163                 return -EINVAL;
 164         }
 165         return 0;
 166 }
 167
 168 static int acpi_battery_technology(struct acpi_battery *battery)
 169 {
 170         if (!strcasecmp("NiCd", battery->device_chemistry))
 171                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 172         if (!strcasecmp("NiMH", battery->device_chemistry))
 173                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 174         if (!strcasecmp("LION", battery->device_chemistry))
 175                 return POWER_SUPPLY_TECHNOLOGY_LION;
 176         if (!strcasecmp("LiP", battery->device_chemistry))
 177                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 178         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 179 }
 180
 181 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 182                                          enum power_supply_property psp,
 183                                          union power_supply_propval *val)
 184 {
 185         struct acpi_battery *battery = to_acpi_battery(psy);
 186
 187         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 188                 return -ENODEV;
 189
 190         acpi_battery_get_state(battery);
 191         switch (psp) {
 192         case POWER_SUPPLY_PROP_STATUS:
 193                 if (battery->rate_now < 0)
 194                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 195                 else if (battery->rate_now > 0)
 196                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 197                 else
 198                         val->intval = POWER_SUPPLY_STATUS_FULL;
 199                 break;
 200         case POWER_SUPPLY_PROP_PRESENT:
 201                 val->intval = battery->present;
 202                 break;
 203         case POWER_SUPPLY_PROP_TECHNOLOGY:
 204                 val->intval = acpi_battery_technology(battery);
 205                 break;
 206         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 207                 val->intval = battery->cycle_count;
 208                 break;
 209         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 210                 val->intval = battery->design_voltage *
 211                         acpi_battery_vscale(battery) * 1000;
 212                 break;
 213         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 214                 val->intval = battery->voltage_now *
 215                                 acpi_battery_vscale(battery) * 1000;
 216                 break;
 217         case POWER_SUPPLY_PROP_CURRENT_NOW:
 218         case POWER_SUPPLY_PROP_POWER_NOW:
 219                 val->intval = abs(battery->rate_now) *
 220                                 acpi_battery_ipscale(battery) * 1000;
 221                 val->intval *= (acpi_battery_mode(battery)) ?
 222                                 (battery->voltage_now *
 223                                 acpi_battery_vscale(battery) / 1000) : 1;
 224                 break;
 225         case POWER_SUPPLY_PROP_CURRENT_AVG:
 226         case POWER_SUPPLY_PROP_POWER_AVG:
 227                 val->intval = abs(battery->rate_avg) *
 228                                 acpi_battery_ipscale(battery) * 1000;
 229                 val->intval *= (acpi_battery_mode(battery)) ?
 230                                 (battery->voltage_now *
 231                                 acpi_battery_vscale(battery) / 1000) : 1;
 232                 break;
 233         case POWER_SUPPLY_PROP_CAPACITY:
 234                 val->intval = battery->state_of_charge;
 235                 break;
 236         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 237         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 238                 val->intval = battery->design_capacity *
 239                         acpi_battery_scale(battery) * 1000;
 240                 break;
 241         case POWER_SUPPLY_PROP_CHARGE_FULL:
 242         case POWER_SUPPLY_PROP_ENERGY_FULL:
 243                 val->intval = battery->full_charge_capacity *
 244                         acpi_battery_scale(battery) * 1000;
 245                 break;
 246         case POWER_SUPPLY_PROP_CHARGE_NOW:
 247         case POWER_SUPPLY_PROP_ENERGY_NOW:
 248                 val->intval = battery->capacity_now *
 249                                 acpi_battery_scale(battery) * 1000;
 250                 break;
 251         case POWER_SUPPLY_PROP_TEMP:
 252                 val->intval = battery->temp_now - 2730; // dK -> dC
 253                 break;
 254         case POWER_SUPPLY_PROP_MODEL_NAME:
 255                 val->strval = battery->device_name;
 256                 break;
 257         case POWER_SUPPLY_PROP_MANUFACTURER:
 258                 val->strval = battery->manufacturer_name;
 259                 break;
 260         default:
 261                 return -EINVAL;
 262         }
 263         return 0;
 264 }
 265
 266 static enum power_supply_property sbs_ac_props[] = {
 267         POWER_SUPPLY_PROP_ONLINE,
 268 };
 269
 270 static enum power_supply_property sbs_charge_battery_props[] = {
 271         POWER_SUPPLY_PROP_STATUS,
 272         POWER_SUPPLY_PROP_PRESENT,
 273         POWER_SUPPLY_PROP_TECHNOLOGY,
 274         POWER_SUPPLY_PROP_CYCLE_COUNT,
 275         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 276         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 277         POWER_SUPPLY_PROP_CURRENT_NOW,
 278         POWER_SUPPLY_PROP_CURRENT_AVG,
 279         POWER_SUPPLY_PROP_CAPACITY,
 280         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 281         POWER_SUPPLY_PROP_CHARGE_FULL,
 282         POWER_SUPPLY_PROP_CHARGE_NOW,
 283         POWER_SUPPLY_PROP_TEMP,
 284         POWER_SUPPLY_PROP_MODEL_NAME,
 285         POWER_SUPPLY_PROP_MANUFACTURER,
 286 };
 287
 288 static enum power_supply_property sbs_energy_battery_props[] = {
 289         POWER_SUPPLY_PROP_STATUS,
 290         POWER_SUPPLY_PROP_PRESENT,
 291         POWER_SUPPLY_PROP_TECHNOLOGY,
 292         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 293         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 294         POWER_SUPPLY_PROP_CURRENT_NOW,
 295         POWER_SUPPLY_PROP_CURRENT_AVG,
 296         POWER_SUPPLY_PROP_POWER_NOW,
 297         POWER_SUPPLY_PROP_POWER_AVG,
 298         POWER_SUPPLY_PROP_CAPACITY,
 299         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 300         POWER_SUPPLY_PROP_ENERGY_FULL,
 301         POWER_SUPPLY_PROP_ENERGY_NOW,
 302         POWER_SUPPLY_PROP_TEMP,
 303         POWER_SUPPLY_PROP_MODEL_NAME,
 304         POWER_SUPPLY_PROP_MANUFACTURER,
 305 };
 306
 307 static const struct power_supply_desc acpi_sbs_charger_desc = {
 308         .name           = "sbs-charger",
 309         .type           = POWER_SUPPLY_TYPE_MAINS,
 310         .properties     = sbs_ac_props,
 311         .num_properties = ARRAY_SIZE(sbs_ac_props),
 312         .get_property   = sbs_get_ac_property,
 313 };
 314
 315 /* --------------------------------------------------------------------------
 316                             Smart Battery System Management
 317    -------------------------------------------------------------------------- */
 318
 319 struct acpi_battery_reader {
 320         u8 command;             /* command for battery */
 321         u8 mode;                /* word or block? */
 322         size_t offset;          /* offset inside struct acpi_sbs_battery */
 323 };
 324
 325 static struct acpi_battery_reader info_readers[] = {
 326         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 327         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 328         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 329         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 330         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 331         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 332         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 333         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 334         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 335         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 336         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 337 };
 338
 339 static struct acpi_battery_reader state_readers[] = {
 340         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 341         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 342         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 343         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 344         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 345         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 346         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 347 };
 348
 349 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 350 {
 351         int result = 0;
 352         u16 battery_system_info;
 353
 354         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 355                                  0x04, (u8 *)&battery_system_info);
 356         if (!result)
 357                 sbs->batteries_supported = battery_system_info & 0x000f;
 358         return result;
 359 }
 360
 361 static int acpi_battery_get_info(struct acpi_battery *battery)
 362 {
 363         int i, result = 0;
 364
 365         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 366                 result = acpi_smbus_read(battery->sbs->hc,
 367                                          info_readers[i].mode,
 368                                          ACPI_SBS_BATTERY,
 369                                          info_readers[i].command,
 370                                          (u8 *) battery +
 371                                                 info_readers[i].offset);
 372                 if (result)
 373                         break;
 374         }
 375         return result;
 376 }
 377
 378 static int acpi_battery_get_state(struct acpi_battery *battery)
 379 {
 380         int i, result = 0;
 381
 382         if (battery->update_time &&
 383             time_before(jiffies, battery->update_time +
 384                                 msecs_to_jiffies(cache_time)))
 385                 return 0;
 386         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 387                 result = acpi_smbus_read(battery->sbs->hc,
 388                                          state_readers[i].mode,
 389                                          ACPI_SBS_BATTERY,
 390                                          state_readers[i].command,
 391                                          (u8 *)battery +
 392                                                 state_readers[i].offset);
 393                 if (result)
 394                         goto end;
 395         }
 396       end:
 397         battery->update_time = jiffies;
 398         return result;
 399 }
 400
 401 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 402 {
 403         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 404                                  ACPI_SBS_BATTERY, 0x01,
 405                                  (u8 *)&battery->alarm_capacity);
 406 }
 407
 408 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 409 {
 410         struct acpi_sbs *sbs = battery->sbs;
 411         u16 value, sel = 1 << (battery->id + 12);
 412
 413         int ret;
 414
 415
 416         if (sbs->manager_present) {
 417                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 418                                 0x01, (u8 *)&value);
 419                 if (ret)
 420                         goto end;
 421                 if ((value & 0xf000) != sel) {
 422                         value &= 0x0fff;
 423                         value |= sel;
 424                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 425                                          ACPI_SBS_MANAGER,
 426                                          0x01, (u8 *)&value, 2);
 427                 if (ret)
 428                         goto end;
 429                 }
 430         }
 431         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 432                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 433       end:
 434         return ret;
 435 }
 436
 437 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 438 {
 439         int result;
 440         u16 status;
 441
 442         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 443                                  0x13, (u8 *) & status);
 444
 445         if (result)
 446                 return result;
 447
 448         /*
 449          * The spec requires that bit 4 always be 1. If it's not set, assume
 450          * that the implementation doesn't support an SBS charger
 451          */
 452         if (!((status >> 4) & 0x1))
 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);