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 acpi_sbs *sbs;
  79         unsigned long update_time;
  80         char name[8];
  81         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  82         char device_name[ACPI_SBS_BLOCK_MAX];
  83         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  84         u16 alarm_capacity;
  85         u16 full_charge_capacity;
  86         u16 design_capacity;
  87         u16 design_voltage;
  88         u16 serial_number;
  89         u16 cycle_count;
  90         u16 temp_now;
  91         u16 voltage_now;
  92         s16 rate_now;
  93         s16 rate_avg;
  94         u16 capacity_now;
  95         u16 state_of_charge;
  96         u16 state;
  97         u16 mode;
  98         u16 spec;
  99         u8 id;
 100         u8 present:1;
 101         u8 have_sysfs_alarm:1;
 102 };
 103
 104 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat)
 105
 106 struct acpi_sbs {
 107         struct power_supply charger;
 108         struct acpi_device *device;
 109         struct acpi_smb_hc *hc;
 110         struct mutex lock;
 111         struct acpi_battery battery[MAX_SBS_BAT];
 112         u8 batteries_supported:4;
 113         u8 manager_present:1;
 114         u8 charger_present:1;
 115         u8 charger_exists:1;
 116 };
 117
 118 #define to_acpi_sbs(x) container_of(x, struct acpi_sbs, charger)
 119
 120 static int acpi_sbs_remove(struct acpi_device *device);
 121 static int acpi_battery_get_state(struct acpi_battery *battery);
 122
 123 static inline int battery_scale(int log)
 124 {
 125         int scale = 1;
 126         while (log--)
 127                 scale *= 10;
 128         return scale;
 129 }
 130
 131 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 132 {
 133         return battery_scale((battery->spec & 0x0f00) >> 8);
 134 }
 135
 136 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 137 {
 138         return battery_scale((battery->spec & 0xf000) >> 12);
 139 }
 140
 141 static inline int acpi_battery_mode(struct acpi_battery *battery)
 142 {
 143         return (battery->mode & 0x8000);
 144 }
 145
 146 static inline int acpi_battery_scale(struct acpi_battery *battery)
 147 {
 148         return (acpi_battery_mode(battery) ? 10 : 1) *
 149             acpi_battery_ipscale(battery);
 150 }
 151
 152 static int sbs_get_ac_property(struct power_supply *psy,
 153                                enum power_supply_property psp,
 154                                union power_supply_propval *val)
 155 {
 156         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 157         switch (psp) {
 158         case POWER_SUPPLY_PROP_ONLINE:
 159                 val->intval = sbs->charger_present;
 160                 break;
 161         default:
 162                 return -EINVAL;
 163         }
 164         return 0;
 165 }
 166
 167 static int acpi_battery_technology(struct acpi_battery *battery)
 168 {
 169         if (!strcasecmp("NiCd", battery->device_chemistry))
 170                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 171         if (!strcasecmp("NiMH", battery->device_chemistry))
 172                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 173         if (!strcasecmp("LION", battery->device_chemistry))
 174                 return POWER_SUPPLY_TECHNOLOGY_LION;
 175         if (!strcasecmp("LiP", battery->device_chemistry))
 176                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 177         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 178 }
 179
 180 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 181                                          enum power_supply_property psp,
 182                                          union power_supply_propval *val)
 183 {
 184         struct acpi_battery *battery = to_acpi_battery(psy);
 185
 186         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 187                 return -ENODEV;
 188
 189         acpi_battery_get_state(battery);
 190         switch (psp) {
 191         case POWER_SUPPLY_PROP_STATUS:
 192                 if (battery->rate_now < 0)
 193                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 194                 else if (battery->rate_now > 0)
 195                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 196                 else
 197                         val->intval = POWER_SUPPLY_STATUS_FULL;
 198                 break;
 199         case POWER_SUPPLY_PROP_PRESENT:
 200                 val->intval = battery->present;
 201                 break;
 202         case POWER_SUPPLY_PROP_TECHNOLOGY:
 203                 val->intval = acpi_battery_technology(battery);
 204                 break;
 205         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 206                 val->intval = battery->cycle_count;
 207                 break;
 208         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 209                 val->intval = battery->design_voltage *
 210                         acpi_battery_vscale(battery) * 1000;
 211                 break;
 212         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 213                 val->intval = battery->voltage_now *
 214                                 acpi_battery_vscale(battery) * 1000;
 215                 break;
 216         case POWER_SUPPLY_PROP_CURRENT_NOW:
 217         case POWER_SUPPLY_PROP_POWER_NOW:
 218                 val->intval = abs(battery->rate_now) *
 219                                 acpi_battery_ipscale(battery) * 1000;
 220                 val->intval *= (acpi_battery_mode(battery)) ?
 221                                 (battery->voltage_now *
 222                                 acpi_battery_vscale(battery) / 1000) : 1;
 223                 break;
 224         case POWER_SUPPLY_PROP_CURRENT_AVG:
 225         case POWER_SUPPLY_PROP_POWER_AVG:
 226                 val->intval = abs(battery->rate_avg) *
 227                                 acpi_battery_ipscale(battery) * 1000;
 228                 val->intval *= (acpi_battery_mode(battery)) ?
 229                                 (battery->voltage_now *
 230                                 acpi_battery_vscale(battery) / 1000) : 1;
 231                 break;
 232         case POWER_SUPPLY_PROP_CAPACITY:
 233                 val->intval = battery->state_of_charge;
 234                 break;
 235         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 236         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 237                 val->intval = battery->design_capacity *
 238                         acpi_battery_scale(battery) * 1000;
 239                 break;
 240         case POWER_SUPPLY_PROP_CHARGE_FULL:
 241         case POWER_SUPPLY_PROP_ENERGY_FULL:
 242                 val->intval = battery->full_charge_capacity *
 243                         acpi_battery_scale(battery) * 1000;
 244                 break;
 245         case POWER_SUPPLY_PROP_CHARGE_NOW:
 246         case POWER_SUPPLY_PROP_ENERGY_NOW:
 247                 val->intval = battery->capacity_now *
 248                                 acpi_battery_scale(battery) * 1000;
 249                 break;
 250         case POWER_SUPPLY_PROP_TEMP:
 251                 val->intval = battery->temp_now - 2730; // dK -> dC
 252                 break;
 253         case POWER_SUPPLY_PROP_MODEL_NAME:
 254                 val->strval = battery->device_name;
 255                 break;
 256         case POWER_SUPPLY_PROP_MANUFACTURER:
 257                 val->strval = battery->manufacturer_name;
 258                 break;
 259         default:
 260                 return -EINVAL;
 261         }
 262         return 0;
 263 }
 264
 265 static enum power_supply_property sbs_ac_props[] = {
 266         POWER_SUPPLY_PROP_ONLINE,
 267 };
 268
 269 static enum power_supply_property sbs_charge_battery_props[] = {
 270         POWER_SUPPLY_PROP_STATUS,
 271         POWER_SUPPLY_PROP_PRESENT,
 272         POWER_SUPPLY_PROP_TECHNOLOGY,
 273         POWER_SUPPLY_PROP_CYCLE_COUNT,
 274         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 275         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 276         POWER_SUPPLY_PROP_CURRENT_NOW,
 277         POWER_SUPPLY_PROP_CURRENT_AVG,
 278         POWER_SUPPLY_PROP_CAPACITY,
 279         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 280         POWER_SUPPLY_PROP_CHARGE_FULL,
 281         POWER_SUPPLY_PROP_CHARGE_NOW,
 282         POWER_SUPPLY_PROP_TEMP,
 283         POWER_SUPPLY_PROP_MODEL_NAME,
 284         POWER_SUPPLY_PROP_MANUFACTURER,
 285 };
 286
 287 static enum power_supply_property sbs_energy_battery_props[] = {
 288         POWER_SUPPLY_PROP_STATUS,
 289         POWER_SUPPLY_PROP_PRESENT,
 290         POWER_SUPPLY_PROP_TECHNOLOGY,
 291         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 292         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 293         POWER_SUPPLY_PROP_CURRENT_NOW,
 294         POWER_SUPPLY_PROP_CURRENT_AVG,
 295         POWER_SUPPLY_PROP_POWER_NOW,
 296         POWER_SUPPLY_PROP_POWER_AVG,
 297         POWER_SUPPLY_PROP_CAPACITY,
 298         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 299         POWER_SUPPLY_PROP_ENERGY_FULL,
 300         POWER_SUPPLY_PROP_ENERGY_NOW,
 301         POWER_SUPPLY_PROP_TEMP,
 302         POWER_SUPPLY_PROP_MODEL_NAME,
 303         POWER_SUPPLY_PROP_MANUFACTURER,
 304 };
 305
 306
 307 /* --------------------------------------------------------------------------
 308                             Smart Battery System Management
 309    -------------------------------------------------------------------------- */
 310
 311 struct acpi_battery_reader {
 312         u8 command;             /* command for battery */
 313         u8 mode;                /* word or block? */
 314         size_t offset;          /* offset inside struct acpi_sbs_battery */
 315 };
 316
 317 static struct acpi_battery_reader info_readers[] = {
 318         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 319         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 320         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 321         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 322         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 323         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 324         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 325         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 326         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 327         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 328         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 329 };
 330
 331 static struct acpi_battery_reader state_readers[] = {
 332         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 333         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 334         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 335         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 336         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 337         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 338         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 339 };
 340
 341 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 342 {
 343         int result = 0;
 344         u16 battery_system_info;
 345
 346         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 347                                  0x04, (u8 *)&battery_system_info);
 348         if (!result)
 349                 sbs->batteries_supported = battery_system_info & 0x000f;
 350         return result;
 351 }
 352
 353 static int acpi_battery_get_info(struct acpi_battery *battery)
 354 {
 355         int i, result = 0;
 356
 357         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 358                 result = acpi_smbus_read(battery->sbs->hc,
 359                                          info_readers[i].mode,
 360                                          ACPI_SBS_BATTERY,
 361                                          info_readers[i].command,
 362                                          (u8 *) battery +
 363                                                 info_readers[i].offset);
 364                 if (result)
 365                         break;
 366         }
 367         return result;
 368 }
 369
 370 static int acpi_battery_get_state(struct acpi_battery *battery)
 371 {
 372         int i, result = 0;
 373
 374         if (battery->update_time &&
 375             time_before(jiffies, battery->update_time +
 376                                 msecs_to_jiffies(cache_time)))
 377                 return 0;
 378         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 379                 result = acpi_smbus_read(battery->sbs->hc,
 380                                          state_readers[i].mode,
 381                                          ACPI_SBS_BATTERY,
 382                                          state_readers[i].command,
 383                                          (u8 *)battery +
 384                                                 state_readers[i].offset);
 385                 if (result)
 386                         goto end;
 387         }
 388       end:
 389         battery->update_time = jiffies;
 390         return result;
 391 }
 392
 393 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 394 {
 395         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 396                                  ACPI_SBS_BATTERY, 0x01,
 397                                  (u8 *)&battery->alarm_capacity);
 398 }
 399
 400 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 401 {
 402         struct acpi_sbs *sbs = battery->sbs;
 403         u16 value, sel = 1 << (battery->id + 12);
 404
 405         int ret;
 406
 407
 408         if (sbs->manager_present) {
 409                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 410                                 0x01, (u8 *)&value);
 411                 if (ret)
 412                         goto end;
 413                 if ((value & 0xf000) != sel) {
 414                         value &= 0x0fff;
 415                         value |= sel;
 416                 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 417                                          ACPI_SBS_MANAGER,
 418                                          0x01, (u8 *)&value, 2);
 419                 if (ret)
 420                         goto end;
 421                 }
 422         }
 423         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 424                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 425       end:
 426         return ret;
 427 }
 428
 429 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 430 {
 431         int result;
 432         u16 status;
 433
 434         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 435                                  0x13, (u8 *) & status);
 436
 437         if (result)
 438                 return result;
 439
 440         /*
 441          * The spec requires that bit 4 always be 1. If it's not set, assume
 442          * that the implementation doesn't support an SBS charger
 443          */
 444         if (!((status >> 4) & 0x1))
 445                 return -ENODEV;
 446
 447         sbs->charger_present = (status >> 15) & 0x1;
 448         return 0;
 449 }
 450
 451 static ssize_t acpi_battery_alarm_show(struct device *dev,
 452                                         struct device_attribute *attr,
 453                                         char *buf)
 454 {
 455         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 456         acpi_battery_get_alarm(battery);
 457         return sprintf(buf, "%d\n", battery->alarm_capacity *
 458                                 acpi_battery_scale(battery) * 1000);
 459 }
 460
 461 static ssize_t acpi_battery_alarm_store(struct device *dev,
 462                                         struct device_attribute *attr,
 463                                         const char *buf, size_t count)
 464 {
 465         unsigned long x;
 466         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 467         if (sscanf(buf, "%lu\n", &x) == 1)
 468                 battery->alarm_capacity = x /
 469                         (1000 * acpi_battery_scale(battery));
 470         if (battery->present)
 471                 acpi_battery_set_alarm(battery);
 472         return count;
 473 }
 474
 475 static struct device_attribute alarm_attr = {
 476         .attr = {.name = "alarm", .mode = 0644},
 477         .show = acpi_battery_alarm_show,
 478         .store = acpi_battery_alarm_store,
 479 };
 480
 481 /* --------------------------------------------------------------------------
 482                                  Driver Interface
 483    -------------------------------------------------------------------------- */
 484 static int acpi_battery_read(struct acpi_battery *battery)
 485 {
 486         int result = 0, saved_present = battery->present;
 487         u16 state;
 488
 489         if (battery->sbs->manager_present) {
 490                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 491                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 492                 if (!result)
 493                         battery->present = state & (1 << battery->id);
 494                 state &= 0x0fff;
 495                 state |= 1 << (battery->id + 12);
 496                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 497                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 498         } else if (battery->id == 0)
 499                 battery->present = 1;
 500
 501         if (result || !battery->present)
 502                 return result;
 503
 504         if (saved_present != battery->present) {
 505                 battery->update_time = 0;
 506                 result = acpi_battery_get_info(battery);
 507                 if (result) {
 508                         battery->present = 0;
 509                         return result;
 510                 }
 511         }
 512         result = acpi_battery_get_state(battery);
 513         if (result)
 514                 battery->present = 0;
 515         return result;
 516 }
 517
 518 /* Smart Battery */
 519 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 520 {
 521         struct acpi_battery *battery = &sbs->battery[id];
 522         int result;
 523
 524         battery->id = id;
 525         battery->sbs = sbs;
 526         result = acpi_battery_read(battery);
 527         if (result)
 528                 return result;
 529
 530         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 531         battery->bat.name = battery->name;
 532         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 533         if (!acpi_battery_mode(battery)) {
 534                 battery->bat.properties = sbs_charge_battery_props;
 535                 battery->bat.num_properties =
 536                     ARRAY_SIZE(sbs_charge_battery_props);
 537         } else {
 538                 battery->bat.properties = sbs_energy_battery_props;
 539                 battery->bat.num_properties =
 540                     ARRAY_SIZE(sbs_energy_battery_props);
 541         }
 542         battery->bat.get_property = acpi_sbs_battery_get_property;
 543         result = power_supply_register(&sbs->device->dev, &battery->bat);
 544         if (result)
 545                 goto end;
 546
 547         result = device_create_file(battery->bat.dev, &alarm_attr);
 548         if (result)
 549                 goto end;
 550         battery->have_sysfs_alarm = 1;
 551       end:
 552         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 553                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 554                battery->name, battery->present ? "present" : "absent");
 555         return result;
 556 }
 557
 558 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 559 {
 560         struct acpi_battery *battery = &sbs->battery[id];
 561
 562         if (battery->bat.dev) {
 563                 if (battery->have_sysfs_alarm)
 564                         device_remove_file(battery->bat.dev, &alarm_attr);
 565                 power_supply_unregister(&battery->bat);
 566         }
 567 }
 568
 569 static int acpi_charger_add(struct acpi_sbs *sbs)
 570 {
 571         int result;
 572
 573         result = acpi_ac_get_present(sbs);
 574         if (result)
 575                 goto end;
 576
 577         sbs->charger_exists = 1;
 578         sbs->charger.name = "sbs-charger";
 579         sbs->charger.type = POWER_SUPPLY_TYPE_MAINS;
 580         sbs->charger.properties = sbs_ac_props;
 581         sbs->charger.num_properties = ARRAY_SIZE(sbs_ac_props);
 582         sbs->charger.get_property = sbs_get_ac_property;
 583         power_supply_register(&sbs->device->dev, &sbs->charger);
 584         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 585                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 586                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 587       end:
 588         return result;
 589 }
 590
 591 static void acpi_charger_remove(struct acpi_sbs *sbs)
 592 {
 593         if (sbs->charger.dev)
 594                 power_supply_unregister(&sbs->charger);
 595 }
 596
 597 static void acpi_sbs_callback(void *context)
 598 {
 599         int id;
 600         struct acpi_sbs *sbs = context;
 601         struct acpi_battery *bat;
 602         u8 saved_charger_state = sbs->charger_present;
 603         u8 saved_battery_state;
 604
 605         if (sbs->charger_exists) {
 606                 acpi_ac_get_present(sbs);
 607                 if (sbs->charger_present != saved_charger_state)
 608                         kobject_uevent(&sbs->charger.dev->kobj, KOBJ_CHANGE);
 609         }
 610
 611         if (sbs->manager_present) {
 612                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 613                         if (!(sbs->batteries_supported & (1 << id)))
 614                                 continue;
 615                         bat = &sbs->battery[id];
 616                         saved_battery_state = bat->present;
 617                         acpi_battery_read(bat);
 618                         if (saved_battery_state == bat->present)
 619                                 continue;
 620                         kobject_uevent(&bat->bat.dev->kobj, KOBJ_CHANGE);
 621                 }
 622         }
 623 }
 624
 625 static int disable_sbs_manager(const struct dmi_system_id *d)
 626 {
 627         sbs_manager_broken = true;
 628         return 0;
 629 }
 630
 631 static struct dmi_system_id acpi_sbs_dmi_table[] = {
 632         {
 633                 .callback = disable_sbs_manager,
 634                 .ident = "Apple",
 635                 .matches = {
 636                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc.")
 637                 },
 638         },
 639         { },
 640 };
 641
 642 static int acpi_sbs_add(struct acpi_device *device)
 643 {
 644         struct acpi_sbs *sbs;
 645         int result = 0;
 646         int id;
 647
 648         dmi_check_system(acpi_sbs_dmi_table);
 649
 650         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 651         if (!sbs) {
 652                 result = -ENOMEM;
 653                 goto end;
 654         }
 655
 656         mutex_init(&sbs->lock);
 657
 658         sbs->hc = acpi_driver_data(device->parent);
 659         sbs->device = device;
 660         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 661         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 662         device->driver_data = sbs;
 663
 664         result = acpi_charger_add(sbs);
 665         if (result && result != -ENODEV)
 666                 goto end;
 667
 668         result = 0;
 669
 670         if (!sbs_manager_broken) {
 671                 result = acpi_manager_get_info(sbs);
 672                 if (!result) {
 673                         sbs->manager_present = 0;
 674                         for (id = 0; id < MAX_SBS_BAT; ++id)
 675                                 if ((sbs->batteries_supported & (1 << id)))
 676                                         acpi_battery_add(sbs, id);
 677                 }
 678         }
 679
 680         if (!sbs->manager_present)
 681                 acpi_battery_add(sbs, 0);
 682
 683         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 684       end:
 685         if (result)
 686                 acpi_sbs_remove(device);
 687         return result;
 688 }
 689
 690 static int acpi_sbs_remove(struct acpi_device *device)
 691 {
 692         struct acpi_sbs *sbs;
 693         int id;
 694
 695         if (!device)
 696                 return -EINVAL;
 697         sbs = acpi_driver_data(device);
 698         if (!sbs)
 699                 return -EINVAL;
 700         mutex_lock(&sbs->lock);
 701         acpi_smbus_unregister_callback(sbs->hc);
 702         for (id = 0; id < MAX_SBS_BAT; ++id)
 703                 acpi_battery_remove(sbs, id);
 704         acpi_charger_remove(sbs);
 705         mutex_unlock(&sbs->lock);
 706         mutex_destroy(&sbs->lock);
 707         kfree(sbs);
 708         return 0;
 709 }
 710
 711 #ifdef CONFIG_PM_SLEEP
 712 static int acpi_sbs_resume(struct device *dev)
 713 {
 714         struct acpi_sbs *sbs;
 715         if (!dev)
 716                 return -EINVAL;
 717         sbs = to_acpi_device(dev)->driver_data;
 718         acpi_sbs_callback(sbs);
 719         return 0;
 720 }
 721 #else
 722 #define acpi_sbs_resume NULL
 723 #endif
 724
 725 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
 726
 727 static struct acpi_driver acpi_sbs_driver = {
 728         .name = "sbs",
 729         .class = ACPI_SBS_CLASS,
 730         .ids = sbs_device_ids,
 731         .ops = {
 732                 .add = acpi_sbs_add,
 733                 .remove = acpi_sbs_remove,
 734                 },
 735         .drv.pm = &acpi_sbs_pm,
 736 };
 737
 738 static int __init acpi_sbs_init(void)
 739 {
 740         int result = 0;
 741
 742         if (acpi_disabled)
 743                 return -ENODEV;
 744
 745         result = acpi_bus_register_driver(&acpi_sbs_driver);
 746         if (result < 0)
 747                 return -ENODEV;
 748
 749         return 0;
 750 }
 751
 752 static void __exit acpi_sbs_exit(void)
 753 {
 754         acpi_bus_unregister_driver(&acpi_sbs_driver);
 755         return;
 756 }
 757
 758 module_init(acpi_sbs_init);
 759 module_exit(acpi_sbs_exit);