drivers/acpi/sbs.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $)
   4  *
   5  *  Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
   6  *  Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
   7  *  Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu>
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <linux/module.h>
  13 #include <linux/moduleparam.h>
  14 #include <linux/kernel.h>
  15
  16 #include <linux/acpi.h>
  17 #include <linux/timer.h>
  18 #include <linux/jiffies.h>
  19 #include <linux/delay.h>
  20 #include <linux/power_supply.h>
  21 #include <linux/platform_data/x86/apple.h>
  22 #include <acpi/battery.h>
  23
  24 #include "sbshc.h"
  25
  26 #define PREFIX "ACPI: "
  27
  28 #define ACPI_SBS_CLASS                  "sbs"
  29 #define ACPI_AC_CLASS                   "ac_adapter"
  30 #define ACPI_SBS_DEVICE_NAME            "Smart Battery System"
  31 #define ACPI_SBS_FILE_INFO              "info"
  32 #define ACPI_SBS_FILE_STATE             "state"
  33 #define ACPI_SBS_FILE_ALARM             "alarm"
  34 #define ACPI_BATTERY_DIR_NAME           "BAT%i"
  35 #define ACPI_AC_DIR_NAME                "AC0"
  36
  37 #define ACPI_SBS_NOTIFY_STATUS          0x80
  38 #define ACPI_SBS_NOTIFY_INFO            0x81
  39
  40 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  41 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver");
  42 MODULE_LICENSE("GPL");
  43
  44 static unsigned int cache_time = 1000;
  45 module_param(cache_time, uint, 0644);
  46 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  47
  48 #define MAX_SBS_BAT                     4
  49 #define ACPI_SBS_BLOCK_MAX              32
  50
  51 static const struct acpi_device_id sbs_device_ids[] = {
  52         {"ACPI0002", 0},
  53         {"", 0},
  54 };
  55 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  56
  57 struct acpi_battery {
  58         struct power_supply *bat;
  59         struct power_supply_desc bat_desc;
  60         struct acpi_sbs *sbs;
  61         unsigned long update_time;
  62         char name[8];
  63         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  64         char device_name[ACPI_SBS_BLOCK_MAX];
  65         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  66         u16 alarm_capacity;
  67         u16 full_charge_capacity;
  68         u16 design_capacity;
  69         u16 design_voltage;
  70         u16 serial_number;
  71         u16 cycle_count;
  72         u16 temp_now;
  73         u16 voltage_now;
  74         s16 rate_now;
  75         s16 rate_avg;
  76         u16 capacity_now;
  77         u16 state_of_charge;
  78         u16 state;
  79         u16 mode;
  80         u16 spec;
  81         u8 id;
  82         u8 present:1;
  83         u8 have_sysfs_alarm:1;
  84 };
  85
  86 #define to_acpi_battery(x) power_supply_get_drvdata(x)
  87
  88 struct acpi_sbs {
  89         struct power_supply *charger;
  90         struct acpi_device *device;
  91         struct acpi_smb_hc *hc;
  92         struct mutex lock;
  93         struct acpi_battery battery[MAX_SBS_BAT];
  94         u8 batteries_supported:4;
  95         u8 manager_present:1;
  96         u8 charger_present:1;
  97         u8 charger_exists:1;
  98 };
  99
 100 #define to_acpi_sbs(x) power_supply_get_drvdata(x)
 101
 102 static int acpi_sbs_remove(struct acpi_device *device);
 103 static int acpi_battery_get_state(struct acpi_battery *battery);
 104
 105 static inline int battery_scale(int log)
 106 {
 107         int scale = 1;
 108         while (log--)
 109                 scale *= 10;
 110         return scale;
 111 }
 112
 113 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 114 {
 115         return battery_scale((battery->spec & 0x0f00) >> 8);
 116 }
 117
 118 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 119 {
 120         return battery_scale((battery->spec & 0xf000) >> 12);
 121 }
 122
 123 static inline int acpi_battery_mode(struct acpi_battery *battery)
 124 {
 125         return (battery->mode & 0x8000);
 126 }
 127
 128 static inline int acpi_battery_scale(struct acpi_battery *battery)
 129 {
 130         return (acpi_battery_mode(battery) ? 10 : 1) *
 131             acpi_battery_ipscale(battery);
 132 }
 133
 134 static int sbs_get_ac_property(struct power_supply *psy,
 135                                enum power_supply_property psp,
 136                                union power_supply_propval *val)
 137 {
 138         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 139         switch (psp) {
 140         case POWER_SUPPLY_PROP_ONLINE:
 141                 val->intval = sbs->charger_present;
 142                 break;
 143         default:
 144                 return -EINVAL;
 145         }
 146         return 0;
 147 }
 148
 149 static int acpi_battery_technology(struct acpi_battery *battery)
 150 {
 151         if (!strcasecmp("NiCd", battery->device_chemistry))
 152                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 153         if (!strcasecmp("NiMH", battery->device_chemistry))
 154                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 155         if (!strcasecmp("LION", battery->device_chemistry))
 156                 return POWER_SUPPLY_TECHNOLOGY_LION;
 157         if (!strcasecmp("LiP", battery->device_chemistry))
 158                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 159         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 160 }
 161
 162 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 163                                          enum power_supply_property psp,
 164                                          union power_supply_propval *val)
 165 {
 166         struct acpi_battery *battery = to_acpi_battery(psy);
 167
 168         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 169                 return -ENODEV;
 170
 171         acpi_battery_get_state(battery);
 172         switch (psp) {
 173         case POWER_SUPPLY_PROP_STATUS:
 174                 if (battery->rate_now < 0)
 175                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 176                 else if (battery->rate_now > 0)
 177                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 178                 else
 179                         val->intval = POWER_SUPPLY_STATUS_FULL;
 180                 break;
 181         case POWER_SUPPLY_PROP_PRESENT:
 182                 val->intval = battery->present;
 183                 break;
 184         case POWER_SUPPLY_PROP_TECHNOLOGY:
 185                 val->intval = acpi_battery_technology(battery);
 186                 break;
 187         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 188                 val->intval = battery->cycle_count;
 189                 break;
 190         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 191                 val->intval = battery->design_voltage *
 192                         acpi_battery_vscale(battery) * 1000;
 193                 break;
 194         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 195                 val->intval = battery->voltage_now *
 196                                 acpi_battery_vscale(battery) * 1000;
 197                 break;
 198         case POWER_SUPPLY_PROP_CURRENT_NOW:
 199         case POWER_SUPPLY_PROP_POWER_NOW:
 200                 val->intval = abs(battery->rate_now) *
 201                                 acpi_battery_ipscale(battery) * 1000;
 202                 val->intval *= (acpi_battery_mode(battery)) ?
 203                                 (battery->voltage_now *
 204                                 acpi_battery_vscale(battery) / 1000) : 1;
 205                 break;
 206         case POWER_SUPPLY_PROP_CURRENT_AVG:
 207         case POWER_SUPPLY_PROP_POWER_AVG:
 208                 val->intval = abs(battery->rate_avg) *
 209                                 acpi_battery_ipscale(battery) * 1000;
 210                 val->intval *= (acpi_battery_mode(battery)) ?
 211                                 (battery->voltage_now *
 212                                 acpi_battery_vscale(battery) / 1000) : 1;
 213                 break;
 214         case POWER_SUPPLY_PROP_CAPACITY:
 215                 val->intval = battery->state_of_charge;
 216                 break;
 217         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 218         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 219                 val->intval = battery->design_capacity *
 220                         acpi_battery_scale(battery) * 1000;
 221                 break;
 222         case POWER_SUPPLY_PROP_CHARGE_FULL:
 223         case POWER_SUPPLY_PROP_ENERGY_FULL:
 224                 val->intval = battery->full_charge_capacity *
 225                         acpi_battery_scale(battery) * 1000;
 226                 break;
 227         case POWER_SUPPLY_PROP_CHARGE_NOW:
 228         case POWER_SUPPLY_PROP_ENERGY_NOW:
 229                 val->intval = battery->capacity_now *
 230                                 acpi_battery_scale(battery) * 1000;
 231                 break;
 232         case POWER_SUPPLY_PROP_TEMP:
 233                 val->intval = battery->temp_now - 2730; // dK -> dC
 234                 break;
 235         case POWER_SUPPLY_PROP_MODEL_NAME:
 236                 val->strval = battery->device_name;
 237                 break;
 238         case POWER_SUPPLY_PROP_MANUFACTURER:
 239                 val->strval = battery->manufacturer_name;
 240                 break;
 241         default:
 242                 return -EINVAL;
 243         }
 244         return 0;
 245 }
 246
 247 static enum power_supply_property sbs_ac_props[] = {
 248         POWER_SUPPLY_PROP_ONLINE,
 249 };
 250
 251 static enum power_supply_property sbs_charge_battery_props[] = {
 252         POWER_SUPPLY_PROP_STATUS,
 253         POWER_SUPPLY_PROP_PRESENT,
 254         POWER_SUPPLY_PROP_TECHNOLOGY,
 255         POWER_SUPPLY_PROP_CYCLE_COUNT,
 256         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 257         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 258         POWER_SUPPLY_PROP_CURRENT_NOW,
 259         POWER_SUPPLY_PROP_CURRENT_AVG,
 260         POWER_SUPPLY_PROP_CAPACITY,
 261         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 262         POWER_SUPPLY_PROP_CHARGE_FULL,
 263         POWER_SUPPLY_PROP_CHARGE_NOW,
 264         POWER_SUPPLY_PROP_TEMP,
 265         POWER_SUPPLY_PROP_MODEL_NAME,
 266         POWER_SUPPLY_PROP_MANUFACTURER,
 267 };
 268
 269 static enum power_supply_property sbs_energy_battery_props[] = {
 270         POWER_SUPPLY_PROP_STATUS,
 271         POWER_SUPPLY_PROP_PRESENT,
 272         POWER_SUPPLY_PROP_TECHNOLOGY,
 273         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 274         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 275         POWER_SUPPLY_PROP_CURRENT_NOW,
 276         POWER_SUPPLY_PROP_CURRENT_AVG,
 277         POWER_SUPPLY_PROP_POWER_NOW,
 278         POWER_SUPPLY_PROP_POWER_AVG,
 279         POWER_SUPPLY_PROP_CAPACITY,
 280         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 281         POWER_SUPPLY_PROP_ENERGY_FULL,
 282         POWER_SUPPLY_PROP_ENERGY_NOW,
 283         POWER_SUPPLY_PROP_TEMP,
 284         POWER_SUPPLY_PROP_MODEL_NAME,
 285         POWER_SUPPLY_PROP_MANUFACTURER,
 286 };
 287
 288 static const struct power_supply_desc acpi_sbs_charger_desc = {
 289         .name           = "sbs-charger",
 290         .type           = POWER_SUPPLY_TYPE_MAINS,
 291         .properties     = sbs_ac_props,
 292         .num_properties = ARRAY_SIZE(sbs_ac_props),
 293         .get_property   = sbs_get_ac_property,
 294 };
 295
 296 /* --------------------------------------------------------------------------
 297                             Smart Battery System Management
 298    -------------------------------------------------------------------------- */
 299
 300 struct acpi_battery_reader {
 301         u8 command;             /* command for battery */
 302         u8 mode;                /* word or block? */
 303         size_t offset;          /* offset inside struct acpi_sbs_battery */
 304 };
 305
 306 static struct acpi_battery_reader info_readers[] = {
 307         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 308         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 309         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 310         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 311         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 312         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 313         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 314         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 315         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 316         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 317         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 318 };
 319
 320 static struct acpi_battery_reader state_readers[] = {
 321         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 322         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 323         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 324         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 325         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 326         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 327         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 328 };
 329
 330 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 331 {
 332         int result = 0;
 333         u16 battery_system_info;
 334
 335         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 336                                  0x04, (u8 *)&battery_system_info);
 337         if (!result)
 338                 sbs->batteries_supported = battery_system_info & 0x000f;
 339         return result;
 340 }
 341
 342 static int acpi_battery_get_info(struct acpi_battery *battery)
 343 {
 344         int i, result = 0;
 345
 346         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 347                 result = acpi_smbus_read(battery->sbs->hc,
 348                                          info_readers[i].mode,
 349                                          ACPI_SBS_BATTERY,
 350                                          info_readers[i].command,
 351                                          (u8 *) battery +
 352                                                 info_readers[i].offset);
 353                 if (result)
 354                         break;
 355         }
 356         return result;
 357 }
 358
 359 static int acpi_battery_get_state(struct acpi_battery *battery)
 360 {
 361         int i, result = 0;
 362
 363         if (battery->update_time &&
 364             time_before(jiffies, battery->update_time +
 365                                 msecs_to_jiffies(cache_time)))
 366                 return 0;
 367         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 368                 result = acpi_smbus_read(battery->sbs->hc,
 369                                          state_readers[i].mode,
 370                                          ACPI_SBS_BATTERY,
 371                                          state_readers[i].command,
 372                                          (u8 *)battery +
 373                                                 state_readers[i].offset);
 374                 if (result)
 375                         goto end;
 376         }
 377       end:
 378         battery->update_time = jiffies;
 379         return result;
 380 }
 381
 382 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 383 {
 384         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 385                                  ACPI_SBS_BATTERY, 0x01,
 386                                  (u8 *)&battery->alarm_capacity);
 387 }
 388
 389 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 390 {
 391         struct acpi_sbs *sbs = battery->sbs;
 392         u16 value, sel = 1 << (battery->id + 12);
 393
 394         int ret;
 395
 396
 397         if (sbs->manager_present) {
 398                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 399                                 0x01, (u8 *)&value);
 400                 if (ret)
 401                         goto end;
 402                 if ((value & 0xf000) != sel) {
 403                         value &= 0x0fff;
 404                         value |= sel;
 405                         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 406                                          ACPI_SBS_MANAGER,
 407                                          0x01, (u8 *)&value, 2);
 408                         if (ret)
 409                                 goto end;
 410                 }
 411         }
 412         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 413                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 414       end:
 415         return ret;
 416 }
 417
 418 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 419 {
 420         int result;
 421         u16 status;
 422
 423         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 424                                  0x13, (u8 *) & status);
 425
 426         if (result)
 427                 return result;
 428
 429         /*
 430          * The spec requires that bit 4 always be 1. If it's not set, assume
 431          * that the implementation doesn't support an SBS charger.
 432          *
 433          * And on some MacBooks a status of 0xffff is always returned, no
 434          * matter whether the charger is plugged in or not, which is also
 435          * wrong, so ignore the SBS charger for those too.
 436          */
 437         if (!((status >> 4) & 0x1) || status == 0xffff)
 438                 return -ENODEV;
 439
 440         sbs->charger_present = (status >> 15) & 0x1;
 441         return 0;
 442 }
 443
 444 static ssize_t acpi_battery_alarm_show(struct device *dev,
 445                                         struct device_attribute *attr,
 446                                         char *buf)
 447 {
 448         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 449         acpi_battery_get_alarm(battery);
 450         return sprintf(buf, "%d\n", battery->alarm_capacity *
 451                                 acpi_battery_scale(battery) * 1000);
 452 }
 453
 454 static ssize_t acpi_battery_alarm_store(struct device *dev,
 455                                         struct device_attribute *attr,
 456                                         const char *buf, size_t count)
 457 {
 458         unsigned long x;
 459         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 460         if (sscanf(buf, "%lu\n", &x) == 1)
 461                 battery->alarm_capacity = x /
 462                         (1000 * acpi_battery_scale(battery));
 463         if (battery->present)
 464                 acpi_battery_set_alarm(battery);
 465         return count;
 466 }
 467
 468 static const struct device_attribute alarm_attr = {
 469         .attr = {.name = "alarm", .mode = 0644},
 470         .show = acpi_battery_alarm_show,
 471         .store = acpi_battery_alarm_store,
 472 };
 473
 474 /* --------------------------------------------------------------------------
 475                                  Driver Interface
 476    -------------------------------------------------------------------------- */
 477 static int acpi_battery_read(struct acpi_battery *battery)
 478 {
 479         int result = 0, saved_present = battery->present;
 480         u16 state;
 481
 482         if (battery->sbs->manager_present) {
 483                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 484                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 485                 if (!result)
 486                         battery->present = state & (1 << battery->id);
 487                 state &= 0x0fff;
 488                 state |= 1 << (battery->id + 12);
 489                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 490                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 491         } else if (battery->id == 0)
 492                 battery->present = 1;
 493
 494         if (result || !battery->present)
 495                 return result;
 496
 497         if (saved_present != battery->present) {
 498                 battery->update_time = 0;
 499                 result = acpi_battery_get_info(battery);
 500                 if (result) {
 501                         battery->present = 0;
 502                         return result;
 503                 }
 504         }
 505         result = acpi_battery_get_state(battery);
 506         if (result)
 507                 battery->present = 0;
 508         return result;
 509 }
 510
 511 /* Smart Battery */
 512 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 513 {
 514         struct acpi_battery *battery = &sbs->battery[id];
 515         struct power_supply_config psy_cfg = { .drv_data = battery, };
 516         int result;
 517
 518         battery->id = id;
 519         battery->sbs = sbs;
 520         result = acpi_battery_read(battery);
 521         if (result)
 522                 return result;
 523
 524         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 525         battery->bat_desc.name = battery->name;
 526         battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 527         if (!acpi_battery_mode(battery)) {
 528                 battery->bat_desc.properties = sbs_charge_battery_props;
 529                 battery->bat_desc.num_properties =
 530                     ARRAY_SIZE(sbs_charge_battery_props);
 531         } else {
 532                 battery->bat_desc.properties = sbs_energy_battery_props;
 533                 battery->bat_desc.num_properties =
 534                     ARRAY_SIZE(sbs_energy_battery_props);
 535         }
 536         battery->bat_desc.get_property = acpi_sbs_battery_get_property;
 537         battery->bat = power_supply_register(&sbs->device->dev,
 538                                         &battery->bat_desc, &psy_cfg);
 539         if (IS_ERR(battery->bat)) {
 540                 result = PTR_ERR(battery->bat);
 541                 battery->bat = NULL;
 542                 goto end;
 543         }
 544
 545         result = device_create_file(&battery->bat->dev, &alarm_attr);
 546         if (result)
 547                 goto end;
 548         battery->have_sysfs_alarm = 1;
 549       end:
 550         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 551                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 552                battery->name, battery->present ? "present" : "absent");
 553         return result;
 554 }
 555
 556 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 557 {
 558         struct acpi_battery *battery = &sbs->battery[id];
 559
 560         if (battery->bat) {
 561                 if (battery->have_sysfs_alarm)
 562                         device_remove_file(&battery->bat->dev, &alarm_attr);
 563                 power_supply_unregister(battery->bat);
 564         }
 565 }
 566
 567 static int acpi_charger_add(struct acpi_sbs *sbs)
 568 {
 569         int result;
 570         struct power_supply_config psy_cfg = { .drv_data = sbs, };
 571
 572         result = acpi_ac_get_present(sbs);
 573         if (result)
 574                 goto end;
 575
 576         sbs->charger_exists = 1;
 577         sbs->charger = power_supply_register(&sbs->device->dev,
 578                                         &acpi_sbs_charger_desc, &psy_cfg);
 579         if (IS_ERR(sbs->charger)) {
 580                 result = PTR_ERR(sbs->charger);
 581                 sbs->charger = NULL;
 582         }
 583         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 584                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 585                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 586       end:
 587         return result;
 588 }
 589
 590 static void acpi_charger_remove(struct acpi_sbs *sbs)
 591 {
 592         if (sbs->charger)
 593                 power_supply_unregister(sbs->charger);
 594 }
 595
 596 static void acpi_sbs_callback(void *context)
 597 {
 598         int id;
 599         struct acpi_sbs *sbs = context;
 600         struct acpi_battery *bat;
 601         u8 saved_charger_state = sbs->charger_present;
 602         u8 saved_battery_state;
 603
 604         if (sbs->charger_exists) {
 605                 acpi_ac_get_present(sbs);
 606                 if (sbs->charger_present != saved_charger_state)
 607                         kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE);
 608         }
 609
 610         if (sbs->manager_present) {
 611                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 612                         if (!(sbs->batteries_supported & (1 << id)))
 613                                 continue;
 614                         bat = &sbs->battery[id];
 615                         saved_battery_state = bat->present;
 616                         acpi_battery_read(bat);
 617                         if (saved_battery_state == bat->present)
 618                                 continue;
 619                         kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE);
 620                 }
 621         }
 622 }
 623
 624 static int acpi_sbs_add(struct acpi_device *device)
 625 {
 626         struct acpi_sbs *sbs;
 627         int result = 0;
 628         int id;
 629
 630         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 631         if (!sbs) {
 632                 result = -ENOMEM;
 633                 goto end;
 634         }
 635
 636         mutex_init(&sbs->lock);
 637
 638         sbs->hc = acpi_driver_data(device->parent);
 639         sbs->device = device;
 640         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 641         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 642         device->driver_data = sbs;
 643
 644         result = acpi_charger_add(sbs);
 645         if (result && result != -ENODEV)
 646                 goto end;
 647
 648         result = 0;
 649
 650         if (!x86_apple_machine) {
 651                 result = acpi_manager_get_info(sbs);
 652                 if (!result) {
 653                         sbs->manager_present = 1;
 654                         for (id = 0; id < MAX_SBS_BAT; ++id)
 655                                 if ((sbs->batteries_supported & (1 << id)))
 656                                         acpi_battery_add(sbs, id);
 657                 }
 658         }
 659
 660         if (!sbs->manager_present)
 661                 acpi_battery_add(sbs, 0);
 662
 663         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 664       end:
 665         if (result)
 666                 acpi_sbs_remove(device);
 667         return result;
 668 }
 669
 670 static int acpi_sbs_remove(struct acpi_device *device)
 671 {
 672         struct acpi_sbs *sbs;
 673         int id;
 674
 675         if (!device)
 676                 return -EINVAL;
 677         sbs = acpi_driver_data(device);
 678         if (!sbs)
 679                 return -EINVAL;
 680         mutex_lock(&sbs->lock);
 681         acpi_smbus_unregister_callback(sbs->hc);
 682         for (id = 0; id < MAX_SBS_BAT; ++id)
 683                 acpi_battery_remove(sbs, id);
 684         acpi_charger_remove(sbs);
 685         mutex_unlock(&sbs->lock);
 686         mutex_destroy(&sbs->lock);
 687         kfree(sbs);
 688         return 0;
 689 }
 690
 691 #ifdef CONFIG_PM_SLEEP
 692 static int acpi_sbs_resume(struct device *dev)
 693 {
 694         struct acpi_sbs *sbs;
 695         if (!dev)
 696                 return -EINVAL;
 697         sbs = to_acpi_device(dev)->driver_data;
 698         acpi_sbs_callback(sbs);
 699         return 0;
 700 }
 701 #else
 702 #define acpi_sbs_resume NULL
 703 #endif
 704
 705 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
 706
 707 static struct acpi_driver acpi_sbs_driver = {
 708         .name = "sbs",
 709         .class = ACPI_SBS_CLASS,
 710         .ids = sbs_device_ids,
 711         .ops = {
 712                 .add = acpi_sbs_add,
 713                 .remove = acpi_sbs_remove,
 714                 },
 715         .drv.pm = &acpi_sbs_pm,
 716 };
 717
 718 static int __init acpi_sbs_init(void)
 719 {
 720         int result = 0;
 721
 722         if (acpi_disabled)
 723                 return -ENODEV;
 724
 725         result = acpi_bus_register_driver(&acpi_sbs_driver);
 726         if (result < 0)
 727                 return -ENODEV;
 728
 729         return 0;
 730 }
 731
 732 static void __exit acpi_sbs_exit(void)
 733 {
 734         acpi_bus_unregister_driver(&acpi_sbs_driver);
 735         return;
 736 }
 737
 738 module_init(acpi_sbs_init);
 739 module_exit(acpi_sbs_exit);