drivers/acpi/battery.c

   1 /*
   2  *  battery.c - ACPI Battery Driver (Revision: 2.0)
   3  *
   4  *  Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
   5  *  Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
   6  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   8  *
   9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or (at
  14  *  your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful, but
  17  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  *  General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with this program; if not, write to the Free Software Foundation, Inc.,
  23  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  24  *
  25  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/types.h>
  32 #include <linux/jiffies.h>
  33 #include <linux/async.h>
  34 #include <linux/dmi.h>
  35 #include <linux/slab.h>
  36
  37 #ifdef CONFIG_ACPI_PROCFS_POWER
  38 #include <linux/proc_fs.h>
  39 #include <linux/seq_file.h>
  40 #include <asm/uaccess.h>
  41 #endif
  42
  43 #include <acpi/acpi_bus.h>
  44 #include <acpi/acpi_drivers.h>
  45
  46 #ifdef CONFIG_ACPI_SYSFS_POWER
  47 #include <linux/power_supply.h>
  48 #endif
  49
  50 #define PREFIX "ACPI: "
  51
  52 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  53
  54 #define ACPI_BATTERY_CLASS              "battery"
  55 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  56 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  57 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  58 #define ACPI_BATTERY_NOTIFY_THRESHOLD   0x82
  59
  60 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  61
  62 ACPI_MODULE_NAME("battery");
  63
  64 MODULE_AUTHOR("Paul Diefenbaugh");
  65 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  66 MODULE_DESCRIPTION("ACPI Battery Driver");
  67 MODULE_LICENSE("GPL");
  68
  69 static unsigned int cache_time = 1000;
  70 module_param(cache_time, uint, 0644);
  71 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  72
  73 #ifdef CONFIG_ACPI_PROCFS_POWER
  74 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  75 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  76
  77 enum acpi_battery_files {
  78         info_tag = 0,
  79         state_tag,
  80         alarm_tag,
  81         ACPI_BATTERY_NUMFILES,
  82 };
  83
  84 #endif
  85
  86 static const struct acpi_device_id battery_device_ids[] = {
  87         {"PNP0C0A", 0},
  88         {"", 0},
  89 };
  90
  91 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  92
  93 enum {
  94         ACPI_BATTERY_ALARM_PRESENT,
  95         ACPI_BATTERY_XINFO_PRESENT,
  96         /* For buggy DSDTs that report negative 16-bit values for either
  97          * charging or discharging current and/or report 0 as 65536
  98          * due to bad math.
  99          */
 100         ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
 101         ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
 102 };
 103
 104 struct acpi_battery {
 105         struct mutex lock;
 106 #ifdef CONFIG_ACPI_SYSFS_POWER
 107         struct power_supply bat;
 108 #endif
 109         struct acpi_device *device;
 110         unsigned long update_time;
 111         int rate_now;
 112         int capacity_now;
 113         int voltage_now;
 114         int design_capacity;
 115         int full_charge_capacity;
 116         int technology;
 117         int design_voltage;
 118         int design_capacity_warning;
 119         int design_capacity_low;
 120         int cycle_count;
 121         int measurement_accuracy;
 122         int max_sampling_time;
 123         int min_sampling_time;
 124         int max_averaging_interval;
 125         int min_averaging_interval;
 126         int capacity_granularity_1;
 127         int capacity_granularity_2;
 128         int alarm;
 129         char model_number[32];
 130         char serial_number[32];
 131         char type[32];
 132         char oem_info[32];
 133         int state;
 134         int power_unit;
 135         unsigned long flags;
 136 };
 137
 138 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 139
 140 inline int acpi_battery_present(struct acpi_battery *battery)
 141 {
 142         return battery->device->status.battery_present;
 143 }
 144
 145 #ifdef CONFIG_ACPI_SYSFS_POWER
 146 static int acpi_battery_technology(struct acpi_battery *battery)
 147 {
 148         if (!strcasecmp("NiCd", battery->type))
 149                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 150         if (!strcasecmp("NiMH", battery->type))
 151                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 152         if (!strcasecmp("LION", battery->type))
 153                 return POWER_SUPPLY_TECHNOLOGY_LION;
 154         if (!strncasecmp("LI-ION", battery->type, 6))
 155                 return POWER_SUPPLY_TECHNOLOGY_LION;
 156         if (!strcasecmp("LiP", battery->type))
 157                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 158         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 159 }
 160
 161 static int acpi_battery_get_state(struct acpi_battery *battery);
 162
 163 static int acpi_battery_is_charged(struct acpi_battery *battery)
 164 {
 165         /* either charging or discharging */
 166         if (battery->state != 0)
 167                 return 0;
 168
 169         /* battery not reporting charge */
 170         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 171             battery->capacity_now == 0)
 172                 return 0;
 173
 174         /* good batteries update full_charge as the batteries degrade */
 175         if (battery->full_charge_capacity == battery->capacity_now)
 176                 return 1;
 177
 178         /* fallback to using design values for broken batteries */
 179         if (battery->design_capacity == battery->capacity_now)
 180                 return 1;
 181
 182         /* we don't do any sort of metric based on percentages */
 183         return 0;
 184 }
 185
 186 static int acpi_battery_get_property(struct power_supply *psy,
 187                                      enum power_supply_property psp,
 188                                      union power_supply_propval *val)
 189 {
 190         struct acpi_battery *battery = to_acpi_battery(psy);
 191
 192         if (acpi_battery_present(battery)) {
 193                 /* run battery update only if it is present */
 194                 acpi_battery_get_state(battery);
 195         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 196                 return -ENODEV;
 197         switch (psp) {
 198         case POWER_SUPPLY_PROP_STATUS:
 199                 if (battery->state & 0x01)
 200                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 201                 else if (battery->state & 0x02)
 202                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 203                 else if (acpi_battery_is_charged(battery))
 204                         val->intval = POWER_SUPPLY_STATUS_FULL;
 205                 else
 206                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 207                 break;
 208         case POWER_SUPPLY_PROP_PRESENT:
 209                 val->intval = acpi_battery_present(battery);
 210                 break;
 211         case POWER_SUPPLY_PROP_TECHNOLOGY:
 212                 val->intval = acpi_battery_technology(battery);
 213                 break;
 214         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 215                 val->intval = battery->cycle_count;
 216                 break;
 217         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 218                 val->intval = battery->design_voltage * 1000;
 219                 break;
 220         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 221                 val->intval = battery->voltage_now * 1000;
 222                 break;
 223         case POWER_SUPPLY_PROP_CURRENT_NOW:
 224         case POWER_SUPPLY_PROP_POWER_NOW:
 225                 val->intval = battery->rate_now * 1000;
 226                 break;
 227         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 228         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 229                 val->intval = battery->design_capacity * 1000;
 230                 break;
 231         case POWER_SUPPLY_PROP_CHARGE_FULL:
 232         case POWER_SUPPLY_PROP_ENERGY_FULL:
 233                 val->intval = battery->full_charge_capacity * 1000;
 234                 break;
 235         case POWER_SUPPLY_PROP_CHARGE_NOW:
 236         case POWER_SUPPLY_PROP_ENERGY_NOW:
 237                 val->intval = battery->capacity_now * 1000;
 238                 break;
 239         case POWER_SUPPLY_PROP_MODEL_NAME:
 240                 val->strval = battery->model_number;
 241                 break;
 242         case POWER_SUPPLY_PROP_MANUFACTURER:
 243                 val->strval = battery->oem_info;
 244                 break;
 245         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 246                 val->strval = battery->serial_number;
 247                 break;
 248         default:
 249                 return -EINVAL;
 250         }
 251         return 0;
 252 }
 253
 254 static enum power_supply_property charge_battery_props[] = {
 255         POWER_SUPPLY_PROP_STATUS,
 256         POWER_SUPPLY_PROP_PRESENT,
 257         POWER_SUPPLY_PROP_TECHNOLOGY,
 258         POWER_SUPPLY_PROP_CYCLE_COUNT,
 259         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 260         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 261         POWER_SUPPLY_PROP_CURRENT_NOW,
 262         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 263         POWER_SUPPLY_PROP_CHARGE_FULL,
 264         POWER_SUPPLY_PROP_CHARGE_NOW,
 265         POWER_SUPPLY_PROP_MODEL_NAME,
 266         POWER_SUPPLY_PROP_MANUFACTURER,
 267         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 268 };
 269
 270 static enum power_supply_property energy_battery_props[] = {
 271         POWER_SUPPLY_PROP_STATUS,
 272         POWER_SUPPLY_PROP_PRESENT,
 273         POWER_SUPPLY_PROP_TECHNOLOGY,
 274         POWER_SUPPLY_PROP_CYCLE_COUNT,
 275         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 276         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 277         POWER_SUPPLY_PROP_POWER_NOW,
 278         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 279         POWER_SUPPLY_PROP_ENERGY_FULL,
 280         POWER_SUPPLY_PROP_ENERGY_NOW,
 281         POWER_SUPPLY_PROP_MODEL_NAME,
 282         POWER_SUPPLY_PROP_MANUFACTURER,
 283         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 284 };
 285 #endif
 286
 287 #ifdef CONFIG_ACPI_PROCFS_POWER
 288 inline char *acpi_battery_units(struct acpi_battery *battery)
 289 {
 290         return (battery->power_unit)?"mA":"mW";
 291 }
 292 #endif
 293
 294 /* --------------------------------------------------------------------------
 295                                Battery Management
 296    -------------------------------------------------------------------------- */
 297 struct acpi_offsets {
 298         size_t offset;          /* offset inside struct acpi_sbs_battery */
 299         u8 mode;                /* int or string? */
 300 };
 301
 302 static struct acpi_offsets state_offsets[] = {
 303         {offsetof(struct acpi_battery, state), 0},
 304         {offsetof(struct acpi_battery, rate_now), 0},
 305         {offsetof(struct acpi_battery, capacity_now), 0},
 306         {offsetof(struct acpi_battery, voltage_now), 0},
 307 };
 308
 309 static struct acpi_offsets info_offsets[] = {
 310         {offsetof(struct acpi_battery, power_unit), 0},
 311         {offsetof(struct acpi_battery, design_capacity), 0},
 312         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 313         {offsetof(struct acpi_battery, technology), 0},
 314         {offsetof(struct acpi_battery, design_voltage), 0},
 315         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 316         {offsetof(struct acpi_battery, design_capacity_low), 0},
 317         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 318         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 319         {offsetof(struct acpi_battery, model_number), 1},
 320         {offsetof(struct acpi_battery, serial_number), 1},
 321         {offsetof(struct acpi_battery, type), 1},
 322         {offsetof(struct acpi_battery, oem_info), 1},
 323 };
 324
 325 static struct acpi_offsets extended_info_offsets[] = {
 326         {offsetof(struct acpi_battery, power_unit), 0},
 327         {offsetof(struct acpi_battery, design_capacity), 0},
 328         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 329         {offsetof(struct acpi_battery, technology), 0},
 330         {offsetof(struct acpi_battery, design_voltage), 0},
 331         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 332         {offsetof(struct acpi_battery, design_capacity_low), 0},
 333         {offsetof(struct acpi_battery, cycle_count), 0},
 334         {offsetof(struct acpi_battery, measurement_accuracy), 0},
 335         {offsetof(struct acpi_battery, max_sampling_time), 0},
 336         {offsetof(struct acpi_battery, min_sampling_time), 0},
 337         {offsetof(struct acpi_battery, max_averaging_interval), 0},
 338         {offsetof(struct acpi_battery, min_averaging_interval), 0},
 339         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 340         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 341         {offsetof(struct acpi_battery, model_number), 1},
 342         {offsetof(struct acpi_battery, serial_number), 1},
 343         {offsetof(struct acpi_battery, type), 1},
 344         {offsetof(struct acpi_battery, oem_info), 1},
 345 };
 346
 347 static int extract_package(struct acpi_battery *battery,
 348                            union acpi_object *package,
 349                            struct acpi_offsets *offsets, int num)
 350 {
 351         int i;
 352         union acpi_object *element;
 353         if (package->type != ACPI_TYPE_PACKAGE)
 354                 return -EFAULT;
 355         for (i = 0; i < num; ++i) {
 356                 if (package->package.count <= i)
 357                         return -EFAULT;
 358                 element = &package->package.elements[i];
 359                 if (offsets[i].mode) {
 360                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 361                         if (element->type == ACPI_TYPE_STRING ||
 362                             element->type == ACPI_TYPE_BUFFER)
 363                                 strncpy(ptr, element->string.pointer, 32);
 364                         else if (element->type == ACPI_TYPE_INTEGER) {
 365                                 strncpy(ptr, (u8 *)&element->integer.value,
 366                                         sizeof(u64));
 367                                 ptr[sizeof(u64)] = 0;
 368                         } else
 369                                 *ptr = 0; /* don't have value */
 370                 } else {
 371                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 372                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 373                                 element->integer.value : -1;
 374                 }
 375         }
 376         return 0;
 377 }
 378
 379 static int acpi_battery_get_status(struct acpi_battery *battery)
 380 {
 381         if (acpi_bus_get_status(battery->device)) {
 382                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 383                 return -ENODEV;
 384         }
 385         return 0;
 386 }
 387
 388 static int acpi_battery_get_info(struct acpi_battery *battery)
 389 {
 390         int result = -EFAULT;
 391         acpi_status status = 0;
 392         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
 393                         "_BIX" : "_BIF";
 394
 395         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 396
 397         if (!acpi_battery_present(battery))
 398                 return 0;
 399         mutex_lock(&battery->lock);
 400         status = acpi_evaluate_object(battery->device->handle, name,
 401                                                 NULL, &buffer);
 402         mutex_unlock(&battery->lock);
 403
 404         if (ACPI_FAILURE(status)) {
 405                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
 406                 return -ENODEV;
 407         }
 408         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
 409                 result = extract_package(battery, buffer.pointer,
 410                                 extended_info_offsets,
 411                                 ARRAY_SIZE(extended_info_offsets));
 412         else
 413                 result = extract_package(battery, buffer.pointer,
 414                                 info_offsets, ARRAY_SIZE(info_offsets));
 415         kfree(buffer.pointer);
 416         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 417                 battery->full_charge_capacity = battery->design_capacity;
 418         return result;
 419 }
 420
 421 static int acpi_battery_get_state(struct acpi_battery *battery)
 422 {
 423         int result = 0;
 424         acpi_status status = 0;
 425         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 426
 427         if (!acpi_battery_present(battery))
 428                 return 0;
 429
 430         if (battery->update_time &&
 431             time_before(jiffies, battery->update_time +
 432                         msecs_to_jiffies(cache_time)))
 433                 return 0;
 434
 435         mutex_lock(&battery->lock);
 436         status = acpi_evaluate_object(battery->device->handle, "_BST",
 437                                       NULL, &buffer);
 438         mutex_unlock(&battery->lock);
 439
 440         if (ACPI_FAILURE(status)) {
 441                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 442                 return -ENODEV;
 443         }
 444
 445         result = extract_package(battery, buffer.pointer,
 446                                  state_offsets, ARRAY_SIZE(state_offsets));
 447         battery->update_time = jiffies;
 448         kfree(buffer.pointer);
 449
 450         if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
 451             battery->rate_now != -1)
 452                 battery->rate_now = abs((s16)battery->rate_now);
 453
 454         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
 455             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
 456                 battery->capacity_now = (battery->capacity_now *
 457                                 battery->full_charge_capacity) / 100;
 458         return result;
 459 }
 460
 461 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 462 {
 463         acpi_status status = 0;
 464         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 465         struct acpi_object_list arg_list = { 1, &arg0 };
 466
 467         if (!acpi_battery_present(battery) ||
 468             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 469                 return -ENODEV;
 470
 471         arg0.integer.value = battery->alarm;
 472
 473         mutex_lock(&battery->lock);
 474         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 475                                  &arg_list, NULL);
 476         mutex_unlock(&battery->lock);
 477
 478         if (ACPI_FAILURE(status))
 479                 return -ENODEV;
 480
 481         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 482         return 0;
 483 }
 484
 485 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 486 {
 487         acpi_status status = AE_OK;
 488         acpi_handle handle = NULL;
 489
 490         /* See if alarms are supported, and if so, set default */
 491         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 492         if (ACPI_FAILURE(status)) {
 493                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 494                 return 0;
 495         }
 496         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 497         if (!battery->alarm)
 498                 battery->alarm = battery->design_capacity_warning;
 499         return acpi_battery_set_alarm(battery);
 500 }
 501
 502 #ifdef CONFIG_ACPI_SYSFS_POWER
 503 static ssize_t acpi_battery_alarm_show(struct device *dev,
 504                                         struct device_attribute *attr,
 505                                         char *buf)
 506 {
 507         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 508         return sprintf(buf, "%d\n", battery->alarm * 1000);
 509 }
 510
 511 static ssize_t acpi_battery_alarm_store(struct device *dev,
 512                                         struct device_attribute *attr,
 513                                         const char *buf, size_t count)
 514 {
 515         unsigned long x;
 516         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 517         if (sscanf(buf, "%ld\n", &x) == 1)
 518                 battery->alarm = x/1000;
 519         if (acpi_battery_present(battery))
 520                 acpi_battery_set_alarm(battery);
 521         return count;
 522 }
 523
 524 static struct device_attribute alarm_attr = {
 525         .attr = {.name = "alarm", .mode = 0644},
 526         .show = acpi_battery_alarm_show,
 527         .store = acpi_battery_alarm_store,
 528 };
 529
 530 static int sysfs_add_battery(struct acpi_battery *battery)
 531 {
 532         int result;
 533
 534         if (battery->power_unit) {
 535                 battery->bat.properties = charge_battery_props;
 536                 battery->bat.num_properties =
 537                         ARRAY_SIZE(charge_battery_props);
 538         } else {
 539                 battery->bat.properties = energy_battery_props;
 540                 battery->bat.num_properties =
 541                         ARRAY_SIZE(energy_battery_props);
 542         }
 543
 544         battery->bat.name = acpi_device_bid(battery->device);
 545         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 546         battery->bat.get_property = acpi_battery_get_property;
 547
 548         result = power_supply_register(&battery->device->dev, &battery->bat);
 549         if (result)
 550                 return result;
 551         return device_create_file(battery->bat.dev, &alarm_attr);
 552 }
 553
 554 static void sysfs_remove_battery(struct acpi_battery *battery)
 555 {
 556         if (!battery->bat.dev)
 557                 return;
 558         device_remove_file(battery->bat.dev, &alarm_attr);
 559         power_supply_unregister(&battery->bat);
 560         battery->bat.dev = NULL;
 561 }
 562 #endif
 563
 564 static void acpi_battery_quirks(struct acpi_battery *battery)
 565 {
 566         if (dmi_name_in_vendors("Acer") && battery->power_unit) {
 567                 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
 568         }
 569 }
 570
 571 /*
 572  * According to the ACPI spec, some kinds of primary batteries can
 573  * report percentage battery remaining capacity directly to OS.
 574  * In this case, it reports the Last Full Charged Capacity == 100
 575  * and BatteryPresentRate == 0xFFFFFFFF.
 576  *
 577  * Now we found some battery reports percentage remaining capacity
 578  * even if it's rechargeable.
 579  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 580  *
 581  * Handle this correctly so that they won't break userspace.
 582  */
 583 static void acpi_battery_quirks2(struct acpi_battery *battery)
 584 {
 585         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 586                 return ;
 587
 588         if (battery->full_charge_capacity == 100 &&
 589             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
 590             battery->capacity_now >=0 && battery->capacity_now <= 100) {
 591                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
 592                 battery->full_charge_capacity = battery->design_capacity;
 593                 battery->capacity_now = (battery->capacity_now *
 594                                 battery->full_charge_capacity) / 100;
 595         }
 596 }
 597
 598 static int acpi_battery_update(struct acpi_battery *battery)
 599 {
 600         int result, old_present = acpi_battery_present(battery);
 601         result = acpi_battery_get_status(battery);
 602         if (result)
 603                 return result;
 604         if (!acpi_battery_present(battery)) {
 605 #ifdef CONFIG_ACPI_SYSFS_POWER
 606                 sysfs_remove_battery(battery);
 607 #endif
 608                 battery->update_time = 0;
 609                 return 0;
 610         }
 611         if (!battery->update_time ||
 612             old_present != acpi_battery_present(battery)) {
 613                 result = acpi_battery_get_info(battery);
 614                 if (result)
 615                         return result;
 616                 acpi_battery_quirks(battery);
 617                 acpi_battery_init_alarm(battery);
 618         }
 619 #ifdef CONFIG_ACPI_SYSFS_POWER
 620         if (!battery->bat.dev)
 621                 sysfs_add_battery(battery);
 622 #endif
 623         result = acpi_battery_get_state(battery);
 624         acpi_battery_quirks2(battery);
 625         return result;
 626 }
 627
 628 /* --------------------------------------------------------------------------
 629                               FS Interface (/proc)
 630    -------------------------------------------------------------------------- */
 631
 632 #ifdef CONFIG_ACPI_PROCFS_POWER
 633 static struct proc_dir_entry *acpi_battery_dir;
 634
 635 static int acpi_battery_print_info(struct seq_file *seq, int result)
 636 {
 637         struct acpi_battery *battery = seq->private;
 638
 639         if (result)
 640                 goto end;
 641
 642         seq_printf(seq, "present:                 %s\n",
 643                    acpi_battery_present(battery)?"yes":"no");
 644         if (!acpi_battery_present(battery))
 645                 goto end;
 646         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 647                 seq_printf(seq, "design capacity:         unknown\n");
 648         else
 649                 seq_printf(seq, "design capacity:         %d %sh\n",
 650                            battery->design_capacity,
 651                            acpi_battery_units(battery));
 652
 653         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 654                 seq_printf(seq, "last full capacity:      unknown\n");
 655         else
 656                 seq_printf(seq, "last full capacity:      %d %sh\n",
 657                            battery->full_charge_capacity,
 658                            acpi_battery_units(battery));
 659
 660         seq_printf(seq, "battery technology:      %srechargeable\n",
 661                    (!battery->technology)?"non-":"");
 662
 663         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 664                 seq_printf(seq, "design voltage:          unknown\n");
 665         else
 666                 seq_printf(seq, "design voltage:          %d mV\n",
 667                            battery->design_voltage);
 668         seq_printf(seq, "design capacity warning: %d %sh\n",
 669                    battery->design_capacity_warning,
 670                    acpi_battery_units(battery));
 671         seq_printf(seq, "design capacity low:     %d %sh\n",
 672                    battery->design_capacity_low,
 673                    acpi_battery_units(battery));
 674         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 675         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 676                    battery->capacity_granularity_1,
 677                    acpi_battery_units(battery));
 678         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 679                    battery->capacity_granularity_2,
 680                    acpi_battery_units(battery));
 681         seq_printf(seq, "model number:            %s\n", battery->model_number);
 682         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 683         seq_printf(seq, "battery type:            %s\n", battery->type);
 684         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 685       end:
 686         if (result)
 687                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 688         return result;
 689 }
 690
 691 static int acpi_battery_print_state(struct seq_file *seq, int result)
 692 {
 693         struct acpi_battery *battery = seq->private;
 694
 695         if (result)
 696                 goto end;
 697
 698         seq_printf(seq, "present:                 %s\n",
 699                    acpi_battery_present(battery)?"yes":"no");
 700         if (!acpi_battery_present(battery))
 701                 goto end;
 702
 703         seq_printf(seq, "capacity state:          %s\n",
 704                         (battery->state & 0x04)?"critical":"ok");
 705         if ((battery->state & 0x01) && (battery->state & 0x02))
 706                 seq_printf(seq,
 707                            "charging state:          charging/discharging\n");
 708         else if (battery->state & 0x01)
 709                 seq_printf(seq, "charging state:          discharging\n");
 710         else if (battery->state & 0x02)
 711                 seq_printf(seq, "charging state:          charging\n");
 712         else
 713                 seq_printf(seq, "charging state:          charged\n");
 714
 715         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 716                 seq_printf(seq, "present rate:            unknown\n");
 717         else
 718                 seq_printf(seq, "present rate:            %d %s\n",
 719                            battery->rate_now, acpi_battery_units(battery));
 720
 721         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 722                 seq_printf(seq, "remaining capacity:      unknown\n");
 723         else
 724                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 725                            battery->capacity_now, acpi_battery_units(battery));
 726         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 727                 seq_printf(seq, "present voltage:         unknown\n");
 728         else
 729                 seq_printf(seq, "present voltage:         %d mV\n",
 730                            battery->voltage_now);
 731       end:
 732         if (result)
 733                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 734
 735         return result;
 736 }
 737
 738 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 739 {
 740         struct acpi_battery *battery = seq->private;
 741
 742         if (result)
 743                 goto end;
 744
 745         if (!acpi_battery_present(battery)) {
 746                 seq_printf(seq, "present:                 no\n");
 747                 goto end;
 748         }
 749         seq_printf(seq, "alarm:                   ");
 750         if (!battery->alarm)
 751                 seq_printf(seq, "unsupported\n");
 752         else
 753                 seq_printf(seq, "%u %sh\n", battery->alarm,
 754                                 acpi_battery_units(battery));
 755       end:
 756         if (result)
 757                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 758         return result;
 759 }
 760
 761 static ssize_t acpi_battery_write_alarm(struct file *file,
 762                                         const char __user * buffer,
 763                                         size_t count, loff_t * ppos)
 764 {
 765         int result = 0;
 766         char alarm_string[12] = { '\0' };
 767         struct seq_file *m = file->private_data;
 768         struct acpi_battery *battery = m->private;
 769
 770         if (!battery || (count > sizeof(alarm_string) - 1))
 771                 return -EINVAL;
 772         if (!acpi_battery_present(battery)) {
 773                 result = -ENODEV;
 774                 goto end;
 775         }
 776         if (copy_from_user(alarm_string, buffer, count)) {
 777                 result = -EFAULT;
 778                 goto end;
 779         }
 780         alarm_string[count] = '\0';
 781         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 782         result = acpi_battery_set_alarm(battery);
 783       end:
 784         if (!result)
 785                 return count;
 786         return result;
 787 }
 788
 789 typedef int(*print_func)(struct seq_file *seq, int result);
 790
 791 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 792         acpi_battery_print_info,
 793         acpi_battery_print_state,
 794         acpi_battery_print_alarm,
 795 };
 796
 797 static int acpi_battery_read(int fid, struct seq_file *seq)
 798 {
 799         struct acpi_battery *battery = seq->private;
 800         int result = acpi_battery_update(battery);
 801         return acpi_print_funcs[fid](seq, result);
 802 }
 803
 804 #define DECLARE_FILE_FUNCTIONS(_name) \
 805 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 806 { \
 807         return acpi_battery_read(_name##_tag, seq); \
 808 } \
 809 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 810 { \
 811         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 812 }
 813
 814 DECLARE_FILE_FUNCTIONS(info);
 815 DECLARE_FILE_FUNCTIONS(state);
 816 DECLARE_FILE_FUNCTIONS(alarm);
 817
 818 #undef DECLARE_FILE_FUNCTIONS
 819
 820 #define FILE_DESCRIPTION_RO(_name) \
 821         { \
 822         .name = __stringify(_name), \
 823         .mode = S_IRUGO, \
 824         .ops = { \
 825                 .open = acpi_battery_##_name##_open_fs, \
 826                 .read = seq_read, \
 827                 .llseek = seq_lseek, \
 828                 .release = single_release, \
 829                 .owner = THIS_MODULE, \
 830                 }, \
 831         }
 832
 833 #define FILE_DESCRIPTION_RW(_name) \
 834         { \
 835         .name = __stringify(_name), \
 836         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 837         .ops = { \
 838                 .open = acpi_battery_##_name##_open_fs, \
 839                 .read = seq_read, \
 840                 .llseek = seq_lseek, \
 841                 .write = acpi_battery_write_##_name, \
 842                 .release = single_release, \
 843                 .owner = THIS_MODULE, \
 844                 }, \
 845         }
 846
 847 static struct battery_file {
 848         struct file_operations ops;
 849         mode_t mode;
 850         const char *name;
 851 } acpi_battery_file[] = {
 852         FILE_DESCRIPTION_RO(info),
 853         FILE_DESCRIPTION_RO(state),
 854         FILE_DESCRIPTION_RW(alarm),
 855 };
 856
 857 #undef FILE_DESCRIPTION_RO
 858 #undef FILE_DESCRIPTION_RW
 859
 860 static int acpi_battery_add_fs(struct acpi_device *device)
 861 {
 862         struct proc_dir_entry *entry = NULL;
 863         int i;
 864
 865         if (!acpi_device_dir(device)) {
 866                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 867                                                      acpi_battery_dir);
 868                 if (!acpi_device_dir(device))
 869                         return -ENODEV;
 870         }
 871
 872         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 873                 entry = proc_create_data(acpi_battery_file[i].name,
 874                                          acpi_battery_file[i].mode,
 875                                          acpi_device_dir(device),
 876                                          &acpi_battery_file[i].ops,
 877                                          acpi_driver_data(device));
 878                 if (!entry)
 879                         return -ENODEV;
 880         }
 881         return 0;
 882 }
 883
 884 static void acpi_battery_remove_fs(struct acpi_device *device)
 885 {
 886         int i;
 887         if (!acpi_device_dir(device))
 888                 return;
 889         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 890                 remove_proc_entry(acpi_battery_file[i].name,
 891                                   acpi_device_dir(device));
 892
 893         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 894         acpi_device_dir(device) = NULL;
 895 }
 896
 897 #endif
 898
 899 /* --------------------------------------------------------------------------
 900                                  Driver Interface
 901    -------------------------------------------------------------------------- */
 902
 903 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 904 {
 905         struct acpi_battery *battery = acpi_driver_data(device);
 906 #ifdef CONFIG_ACPI_SYSFS_POWER
 907         struct device *old;
 908 #endif
 909
 910         if (!battery)
 911                 return;
 912 #ifdef CONFIG_ACPI_SYSFS_POWER
 913         old = battery->bat.dev;
 914 #endif
 915         acpi_battery_update(battery);
 916         acpi_bus_generate_proc_event(device, event,
 917                                      acpi_battery_present(battery));
 918         acpi_bus_generate_netlink_event(device->pnp.device_class,
 919                                         dev_name(&device->dev), event,
 920                                         acpi_battery_present(battery));
 921 #ifdef CONFIG_ACPI_SYSFS_POWER
 922         /* acpi_battery_update could remove power_supply object */
 923         if (old && battery->bat.dev)
 924                 power_supply_changed(&battery->bat);
 925 #endif
 926 }
 927
 928 static int acpi_battery_add(struct acpi_device *device)
 929 {
 930         int result = 0;
 931         struct acpi_battery *battery = NULL;
 932         acpi_handle handle;
 933         if (!device)
 934                 return -EINVAL;
 935         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 936         if (!battery)
 937                 return -ENOMEM;
 938         battery->device = device;
 939         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 940         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 941         device->driver_data = battery;
 942         mutex_init(&battery->lock);
 943         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
 944                         "_BIX", &handle)))
 945                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
 946         acpi_battery_update(battery);
 947 #ifdef CONFIG_ACPI_PROCFS_POWER
 948         result = acpi_battery_add_fs(device);
 949 #endif
 950         if (!result) {
 951                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 952                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 953                         device->status.battery_present ? "present" : "absent");
 954         } else {
 955 #ifdef CONFIG_ACPI_PROCFS_POWER
 956                 acpi_battery_remove_fs(device);
 957 #endif
 958                 kfree(battery);
 959         }
 960         return result;
 961 }
 962
 963 static int acpi_battery_remove(struct acpi_device *device, int type)
 964 {
 965         struct acpi_battery *battery = NULL;
 966
 967         if (!device || !acpi_driver_data(device))
 968                 return -EINVAL;
 969         battery = acpi_driver_data(device);
 970 #ifdef CONFIG_ACPI_PROCFS_POWER
 971         acpi_battery_remove_fs(device);
 972 #endif
 973 #ifdef CONFIG_ACPI_SYSFS_POWER
 974         sysfs_remove_battery(battery);
 975 #endif
 976         mutex_destroy(&battery->lock);
 977         kfree(battery);
 978         return 0;
 979 }
 980
 981 /* this is needed to learn about changes made in suspended state */
 982 static int acpi_battery_resume(struct acpi_device *device)
 983 {
 984         struct acpi_battery *battery;
 985         if (!device)
 986                 return -EINVAL;
 987         battery = acpi_driver_data(device);
 988         battery->update_time = 0;
 989         acpi_battery_update(battery);
 990         return 0;
 991 }
 992
 993 static struct acpi_driver acpi_battery_driver = {
 994         .name = "battery",
 995         .class = ACPI_BATTERY_CLASS,
 996         .ids = battery_device_ids,
 997         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
 998         .ops = {
 999                 .add = acpi_battery_add,
1000                 .resume = acpi_battery_resume,
1001                 .remove = acpi_battery_remove,
1002                 .notify = acpi_battery_notify,
1003                 },
1004 };
1005
1006 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1007 {
1008         if (acpi_disabled)
1009                 return;
1010 #ifdef CONFIG_ACPI_PROCFS_POWER
1011         acpi_battery_dir = acpi_lock_battery_dir();
1012         if (!acpi_battery_dir)
1013                 return;
1014 #endif
1015         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1016 #ifdef CONFIG_ACPI_PROCFS_POWER
1017                 acpi_unlock_battery_dir(acpi_battery_dir);
1018 #endif
1019                 return;
1020         }
1021         return;
1022 }
1023
1024 static int __init acpi_battery_init(void)
1025 {
1026         async_schedule(acpi_battery_init_async, NULL);
1027         return 0;
1028 }
1029
1030 static void __exit acpi_battery_exit(void)
1031 {
1032         acpi_bus_unregister_driver(&acpi_battery_driver);
1033 #ifdef CONFIG_ACPI_PROCFS_POWER
1034         acpi_unlock_battery_dir(acpi_battery_dir);
1035 #endif
1036 }
1037
1038 module_init(acpi_battery_init);
1039 module_exit(acpi_battery_exit);