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