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/platform_data/x86/apple.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 #define MAX_SBS_BAT                     4
  62 #define ACPI_SBS_BLOCK_MAX              32
  63
  64 static const struct acpi_device_id sbs_device_ids[] = {
  65         {"ACPI0002", 0},
  66         {"", 0},
  67 };
  68 MODULE_DEVICE_TABLE(acpi, sbs_device_ids);
  69
  70 struct acpi_battery {
  71         struct power_supply *bat;
  72         struct power_supply_desc bat_desc;
  73         struct acpi_sbs *sbs;
  74         unsigned long update_time;
  75         char name[8];
  76         char manufacturer_name[ACPI_SBS_BLOCK_MAX];
  77         char device_name[ACPI_SBS_BLOCK_MAX];
  78         char device_chemistry[ACPI_SBS_BLOCK_MAX];
  79         u16 alarm_capacity;
  80         u16 full_charge_capacity;
  81         u16 design_capacity;
  82         u16 design_voltage;
  83         u16 serial_number;
  84         u16 cycle_count;
  85         u16 temp_now;
  86         u16 voltage_now;
  87         s16 rate_now;
  88         s16 rate_avg;
  89         u16 capacity_now;
  90         u16 state_of_charge;
  91         u16 state;
  92         u16 mode;
  93         u16 spec;
  94         u8 id;
  95         u8 present:1;
  96         u8 have_sysfs_alarm:1;
  97 };
  98
  99 #define to_acpi_battery(x) power_supply_get_drvdata(x)
 100
 101 struct acpi_sbs {
 102         struct power_supply *charger;
 103         struct acpi_device *device;
 104         struct acpi_smb_hc *hc;
 105         struct mutex lock;
 106         struct acpi_battery battery[MAX_SBS_BAT];
 107         u8 batteries_supported:4;
 108         u8 manager_present:1;
 109         u8 charger_present:1;
 110         u8 charger_exists:1;
 111 };
 112
 113 #define to_acpi_sbs(x) power_supply_get_drvdata(x)
 114
 115 static int acpi_sbs_remove(struct acpi_device *device);
 116 static int acpi_battery_get_state(struct acpi_battery *battery);
 117
 118 static inline int battery_scale(int log)
 119 {
 120         int scale = 1;
 121         while (log--)
 122                 scale *= 10;
 123         return scale;
 124 }
 125
 126 static inline int acpi_battery_vscale(struct acpi_battery *battery)
 127 {
 128         return battery_scale((battery->spec & 0x0f00) >> 8);
 129 }
 130
 131 static inline int acpi_battery_ipscale(struct acpi_battery *battery)
 132 {
 133         return battery_scale((battery->spec & 0xf000) >> 12);
 134 }
 135
 136 static inline int acpi_battery_mode(struct acpi_battery *battery)
 137 {
 138         return (battery->mode & 0x8000);
 139 }
 140
 141 static inline int acpi_battery_scale(struct acpi_battery *battery)
 142 {
 143         return (acpi_battery_mode(battery) ? 10 : 1) *
 144             acpi_battery_ipscale(battery);
 145 }
 146
 147 static int sbs_get_ac_property(struct power_supply *psy,
 148                                enum power_supply_property psp,
 149                                union power_supply_propval *val)
 150 {
 151         struct acpi_sbs *sbs = to_acpi_sbs(psy);
 152         switch (psp) {
 153         case POWER_SUPPLY_PROP_ONLINE:
 154                 val->intval = sbs->charger_present;
 155                 break;
 156         default:
 157                 return -EINVAL;
 158         }
 159         return 0;
 160 }
 161
 162 static int acpi_battery_technology(struct acpi_battery *battery)
 163 {
 164         if (!strcasecmp("NiCd", battery->device_chemistry))
 165                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 166         if (!strcasecmp("NiMH", battery->device_chemistry))
 167                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 168         if (!strcasecmp("LION", battery->device_chemistry))
 169                 return POWER_SUPPLY_TECHNOLOGY_LION;
 170         if (!strcasecmp("LiP", battery->device_chemistry))
 171                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 172         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 173 }
 174
 175 static int acpi_sbs_battery_get_property(struct power_supply *psy,
 176                                          enum power_supply_property psp,
 177                                          union power_supply_propval *val)
 178 {
 179         struct acpi_battery *battery = to_acpi_battery(psy);
 180
 181         if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT)
 182                 return -ENODEV;
 183
 184         acpi_battery_get_state(battery);
 185         switch (psp) {
 186         case POWER_SUPPLY_PROP_STATUS:
 187                 if (battery->rate_now < 0)
 188                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 189                 else if (battery->rate_now > 0)
 190                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 191                 else
 192                         val->intval = POWER_SUPPLY_STATUS_FULL;
 193                 break;
 194         case POWER_SUPPLY_PROP_PRESENT:
 195                 val->intval = battery->present;
 196                 break;
 197         case POWER_SUPPLY_PROP_TECHNOLOGY:
 198                 val->intval = acpi_battery_technology(battery);
 199                 break;
 200         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 201                 val->intval = battery->cycle_count;
 202                 break;
 203         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 204                 val->intval = battery->design_voltage *
 205                         acpi_battery_vscale(battery) * 1000;
 206                 break;
 207         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 208                 val->intval = battery->voltage_now *
 209                                 acpi_battery_vscale(battery) * 1000;
 210                 break;
 211         case POWER_SUPPLY_PROP_CURRENT_NOW:
 212         case POWER_SUPPLY_PROP_POWER_NOW:
 213                 val->intval = abs(battery->rate_now) *
 214                                 acpi_battery_ipscale(battery) * 1000;
 215                 val->intval *= (acpi_battery_mode(battery)) ?
 216                                 (battery->voltage_now *
 217                                 acpi_battery_vscale(battery) / 1000) : 1;
 218                 break;
 219         case POWER_SUPPLY_PROP_CURRENT_AVG:
 220         case POWER_SUPPLY_PROP_POWER_AVG:
 221                 val->intval = abs(battery->rate_avg) *
 222                                 acpi_battery_ipscale(battery) * 1000;
 223                 val->intval *= (acpi_battery_mode(battery)) ?
 224                                 (battery->voltage_now *
 225                                 acpi_battery_vscale(battery) / 1000) : 1;
 226                 break;
 227         case POWER_SUPPLY_PROP_CAPACITY:
 228                 val->intval = battery->state_of_charge;
 229                 break;
 230         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 231         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 232                 val->intval = battery->design_capacity *
 233                         acpi_battery_scale(battery) * 1000;
 234                 break;
 235         case POWER_SUPPLY_PROP_CHARGE_FULL:
 236         case POWER_SUPPLY_PROP_ENERGY_FULL:
 237                 val->intval = battery->full_charge_capacity *
 238                         acpi_battery_scale(battery) * 1000;
 239                 break;
 240         case POWER_SUPPLY_PROP_CHARGE_NOW:
 241         case POWER_SUPPLY_PROP_ENERGY_NOW:
 242                 val->intval = battery->capacity_now *
 243                                 acpi_battery_scale(battery) * 1000;
 244                 break;
 245         case POWER_SUPPLY_PROP_TEMP:
 246                 val->intval = battery->temp_now - 2730; // dK -> dC
 247                 break;
 248         case POWER_SUPPLY_PROP_MODEL_NAME:
 249                 val->strval = battery->device_name;
 250                 break;
 251         case POWER_SUPPLY_PROP_MANUFACTURER:
 252                 val->strval = battery->manufacturer_name;
 253                 break;
 254         default:
 255                 return -EINVAL;
 256         }
 257         return 0;
 258 }
 259
 260 static enum power_supply_property sbs_ac_props[] = {
 261         POWER_SUPPLY_PROP_ONLINE,
 262 };
 263
 264 static enum power_supply_property sbs_charge_battery_props[] = {
 265         POWER_SUPPLY_PROP_STATUS,
 266         POWER_SUPPLY_PROP_PRESENT,
 267         POWER_SUPPLY_PROP_TECHNOLOGY,
 268         POWER_SUPPLY_PROP_CYCLE_COUNT,
 269         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 270         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 271         POWER_SUPPLY_PROP_CURRENT_NOW,
 272         POWER_SUPPLY_PROP_CURRENT_AVG,
 273         POWER_SUPPLY_PROP_CAPACITY,
 274         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 275         POWER_SUPPLY_PROP_CHARGE_FULL,
 276         POWER_SUPPLY_PROP_CHARGE_NOW,
 277         POWER_SUPPLY_PROP_TEMP,
 278         POWER_SUPPLY_PROP_MODEL_NAME,
 279         POWER_SUPPLY_PROP_MANUFACTURER,
 280 };
 281
 282 static enum power_supply_property sbs_energy_battery_props[] = {
 283         POWER_SUPPLY_PROP_STATUS,
 284         POWER_SUPPLY_PROP_PRESENT,
 285         POWER_SUPPLY_PROP_TECHNOLOGY,
 286         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 287         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 288         POWER_SUPPLY_PROP_CURRENT_NOW,
 289         POWER_SUPPLY_PROP_CURRENT_AVG,
 290         POWER_SUPPLY_PROP_POWER_NOW,
 291         POWER_SUPPLY_PROP_POWER_AVG,
 292         POWER_SUPPLY_PROP_CAPACITY,
 293         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 294         POWER_SUPPLY_PROP_ENERGY_FULL,
 295         POWER_SUPPLY_PROP_ENERGY_NOW,
 296         POWER_SUPPLY_PROP_TEMP,
 297         POWER_SUPPLY_PROP_MODEL_NAME,
 298         POWER_SUPPLY_PROP_MANUFACTURER,
 299 };
 300
 301 static const struct power_supply_desc acpi_sbs_charger_desc = {
 302         .name           = "sbs-charger",
 303         .type           = POWER_SUPPLY_TYPE_MAINS,
 304         .properties     = sbs_ac_props,
 305         .num_properties = ARRAY_SIZE(sbs_ac_props),
 306         .get_property   = sbs_get_ac_property,
 307 };
 308
 309 /* --------------------------------------------------------------------------
 310                             Smart Battery System Management
 311    -------------------------------------------------------------------------- */
 312
 313 struct acpi_battery_reader {
 314         u8 command;             /* command for battery */
 315         u8 mode;                /* word or block? */
 316         size_t offset;          /* offset inside struct acpi_sbs_battery */
 317 };
 318
 319 static struct acpi_battery_reader info_readers[] = {
 320         {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)},
 321         {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)},
 322         {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)},
 323         {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)},
 324         {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)},
 325         {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)},
 326         {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)},
 327         {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)},
 328         {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)},
 329         {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)},
 330         {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)},
 331 };
 332
 333 static struct acpi_battery_reader state_readers[] = {
 334         {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)},
 335         {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)},
 336         {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)},
 337         {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)},
 338         {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)},
 339         {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)},
 340         {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)},
 341 };
 342
 343 static int acpi_manager_get_info(struct acpi_sbs *sbs)
 344 {
 345         int result = 0;
 346         u16 battery_system_info;
 347
 348         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 349                                  0x04, (u8 *)&battery_system_info);
 350         if (!result)
 351                 sbs->batteries_supported = battery_system_info & 0x000f;
 352         return result;
 353 }
 354
 355 static int acpi_battery_get_info(struct acpi_battery *battery)
 356 {
 357         int i, result = 0;
 358
 359         for (i = 0; i < ARRAY_SIZE(info_readers); ++i) {
 360                 result = acpi_smbus_read(battery->sbs->hc,
 361                                          info_readers[i].mode,
 362                                          ACPI_SBS_BATTERY,
 363                                          info_readers[i].command,
 364                                          (u8 *) battery +
 365                                                 info_readers[i].offset);
 366                 if (result)
 367                         break;
 368         }
 369         return result;
 370 }
 371
 372 static int acpi_battery_get_state(struct acpi_battery *battery)
 373 {
 374         int i, result = 0;
 375
 376         if (battery->update_time &&
 377             time_before(jiffies, battery->update_time +
 378                                 msecs_to_jiffies(cache_time)))
 379                 return 0;
 380         for (i = 0; i < ARRAY_SIZE(state_readers); ++i) {
 381                 result = acpi_smbus_read(battery->sbs->hc,
 382                                          state_readers[i].mode,
 383                                          ACPI_SBS_BATTERY,
 384                                          state_readers[i].command,
 385                                          (u8 *)battery +
 386                                                 state_readers[i].offset);
 387                 if (result)
 388                         goto end;
 389         }
 390       end:
 391         battery->update_time = jiffies;
 392         return result;
 393 }
 394
 395 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 396 {
 397         return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 398                                  ACPI_SBS_BATTERY, 0x01,
 399                                  (u8 *)&battery->alarm_capacity);
 400 }
 401
 402 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 403 {
 404         struct acpi_sbs *sbs = battery->sbs;
 405         u16 value, sel = 1 << (battery->id + 12);
 406
 407         int ret;
 408
 409
 410         if (sbs->manager_present) {
 411                 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER,
 412                                 0x01, (u8 *)&value);
 413                 if (ret)
 414                         goto end;
 415                 if ((value & 0xf000) != sel) {
 416                         value &= 0x0fff;
 417                         value |= sel;
 418                         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD,
 419                                          ACPI_SBS_MANAGER,
 420                                          0x01, (u8 *)&value, 2);
 421                         if (ret)
 422                                 goto end;
 423                 }
 424         }
 425         ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY,
 426                                 0x01, (u8 *)&battery->alarm_capacity, 2);
 427       end:
 428         return ret;
 429 }
 430
 431 static int acpi_ac_get_present(struct acpi_sbs *sbs)
 432 {
 433         int result;
 434         u16 status;
 435
 436         result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER,
 437                                  0x13, (u8 *) & status);
 438
 439         if (result)
 440                 return result;
 441
 442         /*
 443          * The spec requires that bit 4 always be 1. If it's not set, assume
 444          * that the implementation doesn't support an SBS charger
 445          */
 446         if (!((status >> 4) & 0x1))
 447                 return -ENODEV;
 448
 449         sbs->charger_present = (status >> 15) & 0x1;
 450         return 0;
 451 }
 452
 453 static ssize_t acpi_battery_alarm_show(struct device *dev,
 454                                         struct device_attribute *attr,
 455                                         char *buf)
 456 {
 457         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 458         acpi_battery_get_alarm(battery);
 459         return sprintf(buf, "%d\n", battery->alarm_capacity *
 460                                 acpi_battery_scale(battery) * 1000);
 461 }
 462
 463 static ssize_t acpi_battery_alarm_store(struct device *dev,
 464                                         struct device_attribute *attr,
 465                                         const char *buf, size_t count)
 466 {
 467         unsigned long x;
 468         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 469         if (sscanf(buf, "%lu\n", &x) == 1)
 470                 battery->alarm_capacity = x /
 471                         (1000 * acpi_battery_scale(battery));
 472         if (battery->present)
 473                 acpi_battery_set_alarm(battery);
 474         return count;
 475 }
 476
 477 static const struct device_attribute alarm_attr = {
 478         .attr = {.name = "alarm", .mode = 0644},
 479         .show = acpi_battery_alarm_show,
 480         .store = acpi_battery_alarm_store,
 481 };
 482
 483 /* --------------------------------------------------------------------------
 484                                  Driver Interface
 485    -------------------------------------------------------------------------- */
 486 static int acpi_battery_read(struct acpi_battery *battery)
 487 {
 488         int result = 0, saved_present = battery->present;
 489         u16 state;
 490
 491         if (battery->sbs->manager_present) {
 492                 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD,
 493                                 ACPI_SBS_MANAGER, 0x01, (u8 *)&state);
 494                 if (!result)
 495                         battery->present = state & (1 << battery->id);
 496                 state &= 0x0fff;
 497                 state |= 1 << (battery->id + 12);
 498                 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD,
 499                                   ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2);
 500         } else if (battery->id == 0)
 501                 battery->present = 1;
 502
 503         if (result || !battery->present)
 504                 return result;
 505
 506         if (saved_present != battery->present) {
 507                 battery->update_time = 0;
 508                 result = acpi_battery_get_info(battery);
 509                 if (result) {
 510                         battery->present = 0;
 511                         return result;
 512                 }
 513         }
 514         result = acpi_battery_get_state(battery);
 515         if (result)
 516                 battery->present = 0;
 517         return result;
 518 }
 519
 520 /* Smart Battery */
 521 static int acpi_battery_add(struct acpi_sbs *sbs, int id)
 522 {
 523         struct acpi_battery *battery = &sbs->battery[id];
 524         struct power_supply_config psy_cfg = { .drv_data = battery, };
 525         int result;
 526
 527         battery->id = id;
 528         battery->sbs = sbs;
 529         result = acpi_battery_read(battery);
 530         if (result)
 531                 return result;
 532
 533         sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id);
 534         battery->bat_desc.name = battery->name;
 535         battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY;
 536         if (!acpi_battery_mode(battery)) {
 537                 battery->bat_desc.properties = sbs_charge_battery_props;
 538                 battery->bat_desc.num_properties =
 539                     ARRAY_SIZE(sbs_charge_battery_props);
 540         } else {
 541                 battery->bat_desc.properties = sbs_energy_battery_props;
 542                 battery->bat_desc.num_properties =
 543                     ARRAY_SIZE(sbs_energy_battery_props);
 544         }
 545         battery->bat_desc.get_property = acpi_sbs_battery_get_property;
 546         battery->bat = power_supply_register(&sbs->device->dev,
 547                                         &battery->bat_desc, &psy_cfg);
 548         if (IS_ERR(battery->bat)) {
 549                 result = PTR_ERR(battery->bat);
 550                 battery->bat = NULL;
 551                 goto end;
 552         }
 553
 554         result = device_create_file(&battery->bat->dev, &alarm_attr);
 555         if (result)
 556                 goto end;
 557         battery->have_sysfs_alarm = 1;
 558       end:
 559         printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n",
 560                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 561                battery->name, battery->present ? "present" : "absent");
 562         return result;
 563 }
 564
 565 static void acpi_battery_remove(struct acpi_sbs *sbs, int id)
 566 {
 567         struct acpi_battery *battery = &sbs->battery[id];
 568
 569         if (battery->bat) {
 570                 if (battery->have_sysfs_alarm)
 571                         device_remove_file(&battery->bat->dev, &alarm_attr);
 572                 power_supply_unregister(battery->bat);
 573         }
 574 }
 575
 576 static int acpi_charger_add(struct acpi_sbs *sbs)
 577 {
 578         int result;
 579         struct power_supply_config psy_cfg = { .drv_data = sbs, };
 580
 581         result = acpi_ac_get_present(sbs);
 582         if (result)
 583                 goto end;
 584
 585         sbs->charger_exists = 1;
 586         sbs->charger = power_supply_register(&sbs->device->dev,
 587                                         &acpi_sbs_charger_desc, &psy_cfg);
 588         if (IS_ERR(sbs->charger)) {
 589                 result = PTR_ERR(sbs->charger);
 590                 sbs->charger = NULL;
 591         }
 592         printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n",
 593                ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device),
 594                ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line");
 595       end:
 596         return result;
 597 }
 598
 599 static void acpi_charger_remove(struct acpi_sbs *sbs)
 600 {
 601         if (sbs->charger)
 602                 power_supply_unregister(sbs->charger);
 603 }
 604
 605 static void acpi_sbs_callback(void *context)
 606 {
 607         int id;
 608         struct acpi_sbs *sbs = context;
 609         struct acpi_battery *bat;
 610         u8 saved_charger_state = sbs->charger_present;
 611         u8 saved_battery_state;
 612
 613         if (sbs->charger_exists) {
 614                 acpi_ac_get_present(sbs);
 615                 if (sbs->charger_present != saved_charger_state)
 616                         kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE);
 617         }
 618
 619         if (sbs->manager_present) {
 620                 for (id = 0; id < MAX_SBS_BAT; ++id) {
 621                         if (!(sbs->batteries_supported & (1 << id)))
 622                                 continue;
 623                         bat = &sbs->battery[id];
 624                         saved_battery_state = bat->present;
 625                         acpi_battery_read(bat);
 626                         if (saved_battery_state == bat->present)
 627                                 continue;
 628                         kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE);
 629                 }
 630         }
 631 }
 632
 633 static int acpi_sbs_add(struct acpi_device *device)
 634 {
 635         struct acpi_sbs *sbs;
 636         int result = 0;
 637         int id;
 638
 639         sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL);
 640         if (!sbs) {
 641                 result = -ENOMEM;
 642                 goto end;
 643         }
 644
 645         mutex_init(&sbs->lock);
 646
 647         sbs->hc = acpi_driver_data(device->parent);
 648         sbs->device = device;
 649         strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME);
 650         strcpy(acpi_device_class(device), ACPI_SBS_CLASS);
 651         device->driver_data = sbs;
 652
 653         result = acpi_charger_add(sbs);
 654         if (result && result != -ENODEV)
 655                 goto end;
 656
 657         result = 0;
 658
 659         if (!x86_apple_machine) {
 660                 result = acpi_manager_get_info(sbs);
 661                 if (!result) {
 662                         sbs->manager_present = 1;
 663                         for (id = 0; id < MAX_SBS_BAT; ++id)
 664                                 if ((sbs->batteries_supported & (1 << id)))
 665                                         acpi_battery_add(sbs, id);
 666                 }
 667         }
 668
 669         if (!sbs->manager_present)
 670                 acpi_battery_add(sbs, 0);
 671
 672         acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs);
 673       end:
 674         if (result)
 675                 acpi_sbs_remove(device);
 676         return result;
 677 }
 678
 679 static int acpi_sbs_remove(struct acpi_device *device)
 680 {
 681         struct acpi_sbs *sbs;
 682         int id;
 683
 684         if (!device)
 685                 return -EINVAL;
 686         sbs = acpi_driver_data(device);
 687         if (!sbs)
 688                 return -EINVAL;
 689         mutex_lock(&sbs->lock);
 690         acpi_smbus_unregister_callback(sbs->hc);
 691         for (id = 0; id < MAX_SBS_BAT; ++id)
 692                 acpi_battery_remove(sbs, id);
 693         acpi_charger_remove(sbs);
 694         mutex_unlock(&sbs->lock);
 695         mutex_destroy(&sbs->lock);
 696         kfree(sbs);
 697         return 0;
 698 }
 699
 700 #ifdef CONFIG_PM_SLEEP
 701 static int acpi_sbs_resume(struct device *dev)
 702 {
 703         struct acpi_sbs *sbs;
 704         if (!dev)
 705                 return -EINVAL;
 706         sbs = to_acpi_device(dev)->driver_data;
 707         acpi_sbs_callback(sbs);
 708         return 0;
 709 }
 710 #else
 711 #define acpi_sbs_resume NULL
 712 #endif
 713
 714 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume);
 715
 716 static struct acpi_driver acpi_sbs_driver = {
 717         .name = "sbs",
 718         .class = ACPI_SBS_CLASS,
 719         .ids = sbs_device_ids,
 720         .ops = {
 721                 .add = acpi_sbs_add,
 722                 .remove = acpi_sbs_remove,
 723                 },
 724         .drv.pm = &acpi_sbs_pm,
 725 };
 726
 727 static int __init acpi_sbs_init(void)
 728 {
 729         int result = 0;
 730
 731         if (acpi_disabled)
 732                 return -ENODEV;
 733
 734         result = acpi_bus_register_driver(&acpi_sbs_driver);
 735         if (result < 0)
 736                 return -ENODEV;
 737
 738         return 0;
 739 }
 740
 741 static void __exit acpi_sbs_exit(void)
 742 {
 743         acpi_bus_unregister_driver(&acpi_sbs_driver);
 744         return;
 745 }
 746
 747 module_init(acpi_sbs_init);
 748 module_exit(acpi_sbs_exit);