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 #include <linux/power_supply.h>
  46
  47 #define PREFIX "ACPI: "
  48
  49 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  50
  51 #define ACPI_BATTERY_CLASS              "battery"
  52 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  53 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  54 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  55 #define ACPI_BATTERY_NOTIFY_THRESHOLD   0x82
  56
  57 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  58
  59 ACPI_MODULE_NAME("battery");
  60
  61 MODULE_AUTHOR("Paul Diefenbaugh");
  62 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  63 MODULE_DESCRIPTION("ACPI Battery Driver");
  64 MODULE_LICENSE("GPL");
  65
  66 static unsigned int cache_time = 1000;
  67 module_param(cache_time, uint, 0644);
  68 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  69
  70 #ifdef CONFIG_ACPI_PROCFS_POWER
  71 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  72 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  73
  74 enum acpi_battery_files {
  75         info_tag = 0,
  76         state_tag,
  77         alarm_tag,
  78         ACPI_BATTERY_NUMFILES,
  79 };
  80
  81 #endif
  82
  83 static const struct acpi_device_id battery_device_ids[] = {
  84         {"PNP0C0A", 0},
  85         {"", 0},
  86 };
  87
  88 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  89
  90 enum {
  91         ACPI_BATTERY_ALARM_PRESENT,
  92         ACPI_BATTERY_XINFO_PRESENT,
  93         /* For buggy DSDTs that report negative 16-bit values for either
  94          * charging or discharging current and/or report 0 as 65536
  95          * due to bad math.
  96          */
  97         ACPI_BATTERY_QUIRK_SIGNED16_CURRENT,
  98         ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
  99 };
 100
 101 struct acpi_battery {
 102         struct mutex lock;
 103         struct power_supply bat;
 104         struct acpi_device *device;
 105         unsigned long update_time;
 106         int rate_now;
 107         int capacity_now;
 108         int voltage_now;
 109         int design_capacity;
 110         int full_charge_capacity;
 111         int technology;
 112         int design_voltage;
 113         int design_capacity_warning;
 114         int design_capacity_low;
 115         int cycle_count;
 116         int measurement_accuracy;
 117         int max_sampling_time;
 118         int min_sampling_time;
 119         int max_averaging_interval;
 120         int min_averaging_interval;
 121         int capacity_granularity_1;
 122         int capacity_granularity_2;
 123         int alarm;
 124         char model_number[32];
 125         char serial_number[32];
 126         char type[32];
 127         char oem_info[32];
 128         int state;
 129         int power_unit;
 130         unsigned long flags;
 131 };
 132
 133 static int acpi_battery_update(struct acpi_battery *battery);
 134
 135 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 136
 137 inline int acpi_battery_present(struct acpi_battery *battery)
 138 {
 139         return battery->device->status.battery_present;
 140 }
 141
 142 static int acpi_battery_technology(struct acpi_battery *battery)
 143 {
 144         if (!strcasecmp("NiCd", battery->type))
 145                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 146         if (!strcasecmp("NiMH", battery->type))
 147                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 148         if (!strcasecmp("LION", battery->type))
 149                 return POWER_SUPPLY_TECHNOLOGY_LION;
 150         if (!strncasecmp("LI-ION", battery->type, 6))
 151                 return POWER_SUPPLY_TECHNOLOGY_LION;
 152         if (!strcasecmp("LiP", battery->type))
 153                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 154         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 155 }
 156
 157 static int acpi_battery_get_state(struct acpi_battery *battery);
 158
 159 static int acpi_battery_is_charged(struct acpi_battery *battery)
 160 {
 161         /* either charging or discharging */
 162         if (battery->state != 0)
 163                 return 0;
 164
 165         /* battery not reporting charge */
 166         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 167             battery->capacity_now == 0)
 168                 return 0;
 169
 170         /* good batteries update full_charge as the batteries degrade */
 171         if (battery->full_charge_capacity == battery->capacity_now)
 172                 return 1;
 173
 174         /* fallback to using design values for broken batteries */
 175         if (battery->design_capacity == battery->capacity_now)
 176                 return 1;
 177
 178         /* we don't do any sort of metric based on percentages */
 179         return 0;
 180 }
 181
 182 static int acpi_battery_get_property(struct power_supply *psy,
 183                                      enum power_supply_property psp,
 184                                      union power_supply_propval *val)
 185 {
 186         int ret = 0;
 187         struct acpi_battery *battery = to_acpi_battery(psy);
 188
 189         if (acpi_battery_update(battery))
 190                 return -ENODEV;
 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                 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 219                         ret = -ENODEV;
 220                 else
 221                         val->intval = battery->design_voltage * 1000;
 222                 break;
 223         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 224                 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 225                         ret = -ENODEV;
 226                 else
 227                         val->intval = battery->voltage_now * 1000;
 228                 break;
 229         case POWER_SUPPLY_PROP_CURRENT_NOW:
 230         case POWER_SUPPLY_PROP_POWER_NOW:
 231                 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 232                         ret = -ENODEV;
 233                 else
 234                         val->intval = battery->rate_now * 1000;
 235                 break;
 236         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 237         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 238                 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 239                         ret = -ENODEV;
 240                 else
 241                         val->intval = battery->design_capacity * 1000;
 242                 break;
 243         case POWER_SUPPLY_PROP_CHARGE_FULL:
 244         case POWER_SUPPLY_PROP_ENERGY_FULL:
 245                 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 246                         ret = -ENODEV;
 247                 else
 248                         val->intval = battery->full_charge_capacity * 1000;
 249                 break;
 250         case POWER_SUPPLY_PROP_CHARGE_NOW:
 251         case POWER_SUPPLY_PROP_ENERGY_NOW:
 252                 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 253                         ret = -ENODEV;
 254                 else
 255                         val->intval = battery->capacity_now * 1000;
 256                 break;
 257         case POWER_SUPPLY_PROP_MODEL_NAME:
 258                 val->strval = battery->model_number;
 259                 break;
 260         case POWER_SUPPLY_PROP_MANUFACTURER:
 261                 val->strval = battery->oem_info;
 262                 break;
 263         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 264                 val->strval = battery->serial_number;
 265                 break;
 266         default:
 267                 ret = -EINVAL;
 268         }
 269         return ret;
 270 }
 271
 272 static enum power_supply_property charge_battery_props[] = {
 273         POWER_SUPPLY_PROP_STATUS,
 274         POWER_SUPPLY_PROP_PRESENT,
 275         POWER_SUPPLY_PROP_TECHNOLOGY,
 276         POWER_SUPPLY_PROP_CYCLE_COUNT,
 277         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 278         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 279         POWER_SUPPLY_PROP_CURRENT_NOW,
 280         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 281         POWER_SUPPLY_PROP_CHARGE_FULL,
 282         POWER_SUPPLY_PROP_CHARGE_NOW,
 283         POWER_SUPPLY_PROP_MODEL_NAME,
 284         POWER_SUPPLY_PROP_MANUFACTURER,
 285         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 286 };
 287
 288 static enum power_supply_property energy_battery_props[] = {
 289         POWER_SUPPLY_PROP_STATUS,
 290         POWER_SUPPLY_PROP_PRESENT,
 291         POWER_SUPPLY_PROP_TECHNOLOGY,
 292         POWER_SUPPLY_PROP_CYCLE_COUNT,
 293         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 294         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 295         POWER_SUPPLY_PROP_POWER_NOW,
 296         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 297         POWER_SUPPLY_PROP_ENERGY_FULL,
 298         POWER_SUPPLY_PROP_ENERGY_NOW,
 299         POWER_SUPPLY_PROP_MODEL_NAME,
 300         POWER_SUPPLY_PROP_MANUFACTURER,
 301         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 302 };
 303
 304 #ifdef CONFIG_ACPI_PROCFS_POWER
 305 inline char *acpi_battery_units(struct acpi_battery *battery)
 306 {
 307         return (battery->power_unit)?"mA":"mW";
 308 }
 309 #endif
 310
 311 /* --------------------------------------------------------------------------
 312                                Battery Management
 313    -------------------------------------------------------------------------- */
 314 struct acpi_offsets {
 315         size_t offset;          /* offset inside struct acpi_sbs_battery */
 316         u8 mode;                /* int or string? */
 317 };
 318
 319 static struct acpi_offsets state_offsets[] = {
 320         {offsetof(struct acpi_battery, state), 0},
 321         {offsetof(struct acpi_battery, rate_now), 0},
 322         {offsetof(struct acpi_battery, capacity_now), 0},
 323         {offsetof(struct acpi_battery, voltage_now), 0},
 324 };
 325
 326 static struct acpi_offsets info_offsets[] = {
 327         {offsetof(struct acpi_battery, power_unit), 0},
 328         {offsetof(struct acpi_battery, design_capacity), 0},
 329         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 330         {offsetof(struct acpi_battery, technology), 0},
 331         {offsetof(struct acpi_battery, design_voltage), 0},
 332         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 333         {offsetof(struct acpi_battery, design_capacity_low), 0},
 334         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 335         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 336         {offsetof(struct acpi_battery, model_number), 1},
 337         {offsetof(struct acpi_battery, serial_number), 1},
 338         {offsetof(struct acpi_battery, type), 1},
 339         {offsetof(struct acpi_battery, oem_info), 1},
 340 };
 341
 342 static struct acpi_offsets extended_info_offsets[] = {
 343         {offsetof(struct acpi_battery, power_unit), 0},
 344         {offsetof(struct acpi_battery, design_capacity), 0},
 345         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 346         {offsetof(struct acpi_battery, technology), 0},
 347         {offsetof(struct acpi_battery, design_voltage), 0},
 348         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 349         {offsetof(struct acpi_battery, design_capacity_low), 0},
 350         {offsetof(struct acpi_battery, cycle_count), 0},
 351         {offsetof(struct acpi_battery, measurement_accuracy), 0},
 352         {offsetof(struct acpi_battery, max_sampling_time), 0},
 353         {offsetof(struct acpi_battery, min_sampling_time), 0},
 354         {offsetof(struct acpi_battery, max_averaging_interval), 0},
 355         {offsetof(struct acpi_battery, min_averaging_interval), 0},
 356         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 357         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 358         {offsetof(struct acpi_battery, model_number), 1},
 359         {offsetof(struct acpi_battery, serial_number), 1},
 360         {offsetof(struct acpi_battery, type), 1},
 361         {offsetof(struct acpi_battery, oem_info), 1},
 362 };
 363
 364 static int extract_package(struct acpi_battery *battery,
 365                            union acpi_object *package,
 366                            struct acpi_offsets *offsets, int num)
 367 {
 368         int i;
 369         union acpi_object *element;
 370         if (package->type != ACPI_TYPE_PACKAGE)
 371                 return -EFAULT;
 372         for (i = 0; i < num; ++i) {
 373                 if (package->package.count <= i)
 374                         return -EFAULT;
 375                 element = &package->package.elements[i];
 376                 if (offsets[i].mode) {
 377                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 378                         if (element->type == ACPI_TYPE_STRING ||
 379                             element->type == ACPI_TYPE_BUFFER)
 380                                 strncpy(ptr, element->string.pointer, 32);
 381                         else if (element->type == ACPI_TYPE_INTEGER) {
 382                                 strncpy(ptr, (u8 *)&element->integer.value,
 383                                         sizeof(u64));
 384                                 ptr[sizeof(u64)] = 0;
 385                         } else
 386                                 *ptr = 0; /* don't have value */
 387                 } else {
 388                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 389                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 390                                 element->integer.value : -1;
 391                 }
 392         }
 393         return 0;
 394 }
 395
 396 static int acpi_battery_get_status(struct acpi_battery *battery)
 397 {
 398         if (acpi_bus_get_status(battery->device)) {
 399                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 400                 return -ENODEV;
 401         }
 402         return 0;
 403 }
 404
 405 static int acpi_battery_get_info(struct acpi_battery *battery)
 406 {
 407         int result = -EFAULT;
 408         acpi_status status = 0;
 409         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
 410                         "_BIX" : "_BIF";
 411
 412         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 413
 414         if (!acpi_battery_present(battery))
 415                 return 0;
 416         mutex_lock(&battery->lock);
 417         status = acpi_evaluate_object(battery->device->handle, name,
 418                                                 NULL, &buffer);
 419         mutex_unlock(&battery->lock);
 420
 421         if (ACPI_FAILURE(status)) {
 422                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
 423                 return -ENODEV;
 424         }
 425         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
 426                 result = extract_package(battery, buffer.pointer,
 427                                 extended_info_offsets,
 428                                 ARRAY_SIZE(extended_info_offsets));
 429         else
 430                 result = extract_package(battery, buffer.pointer,
 431                                 info_offsets, ARRAY_SIZE(info_offsets));
 432         kfree(buffer.pointer);
 433         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 434                 battery->full_charge_capacity = battery->design_capacity;
 435         return result;
 436 }
 437
 438 static int acpi_battery_get_state(struct acpi_battery *battery)
 439 {
 440         int result = 0;
 441         acpi_status status = 0;
 442         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 443
 444         if (!acpi_battery_present(battery))
 445                 return 0;
 446
 447         if (battery->update_time &&
 448             time_before(jiffies, battery->update_time +
 449                         msecs_to_jiffies(cache_time)))
 450                 return 0;
 451
 452         mutex_lock(&battery->lock);
 453         status = acpi_evaluate_object(battery->device->handle, "_BST",
 454                                       NULL, &buffer);
 455         mutex_unlock(&battery->lock);
 456
 457         if (ACPI_FAILURE(status)) {
 458                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 459                 return -ENODEV;
 460         }
 461
 462         result = extract_package(battery, buffer.pointer,
 463                                  state_offsets, ARRAY_SIZE(state_offsets));
 464         battery->update_time = jiffies;
 465         kfree(buffer.pointer);
 466
 467         if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) &&
 468             battery->rate_now != -1)
 469                 battery->rate_now = abs((s16)battery->rate_now);
 470
 471         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
 472             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
 473                 battery->capacity_now = (battery->capacity_now *
 474                                 battery->full_charge_capacity) / 100;
 475         return result;
 476 }
 477
 478 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 479 {
 480         acpi_status status = 0;
 481         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 482         struct acpi_object_list arg_list = { 1, &arg0 };
 483
 484         if (!acpi_battery_present(battery) ||
 485             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 486                 return -ENODEV;
 487
 488         arg0.integer.value = battery->alarm;
 489
 490         mutex_lock(&battery->lock);
 491         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 492                                  &arg_list, NULL);
 493         mutex_unlock(&battery->lock);
 494
 495         if (ACPI_FAILURE(status))
 496                 return -ENODEV;
 497
 498         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 499         return 0;
 500 }
 501
 502 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 503 {
 504         acpi_status status = AE_OK;
 505         acpi_handle handle = NULL;
 506
 507         /* See if alarms are supported, and if so, set default */
 508         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 509         if (ACPI_FAILURE(status)) {
 510                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 511                 return 0;
 512         }
 513         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 514         if (!battery->alarm)
 515                 battery->alarm = battery->design_capacity_warning;
 516         return acpi_battery_set_alarm(battery);
 517 }
 518
 519 static ssize_t acpi_battery_alarm_show(struct device *dev,
 520                                         struct device_attribute *attr,
 521                                         char *buf)
 522 {
 523         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 524         return sprintf(buf, "%d\n", battery->alarm * 1000);
 525 }
 526
 527 static ssize_t acpi_battery_alarm_store(struct device *dev,
 528                                         struct device_attribute *attr,
 529                                         const char *buf, size_t count)
 530 {
 531         unsigned long x;
 532         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 533         if (sscanf(buf, "%ld\n", &x) == 1)
 534                 battery->alarm = x/1000;
 535         if (acpi_battery_present(battery))
 536                 acpi_battery_set_alarm(battery);
 537         return count;
 538 }
 539
 540 static struct device_attribute alarm_attr = {
 541         .attr = {.name = "alarm", .mode = 0644},
 542         .show = acpi_battery_alarm_show,
 543         .store = acpi_battery_alarm_store,
 544 };
 545
 546 static int sysfs_add_battery(struct acpi_battery *battery)
 547 {
 548         int result;
 549
 550         if (battery->power_unit) {
 551                 battery->bat.properties = charge_battery_props;
 552                 battery->bat.num_properties =
 553                         ARRAY_SIZE(charge_battery_props);
 554         } else {
 555                 battery->bat.properties = energy_battery_props;
 556                 battery->bat.num_properties =
 557                         ARRAY_SIZE(energy_battery_props);
 558         }
 559
 560         battery->bat.name = acpi_device_bid(battery->device);
 561         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 562         battery->bat.get_property = acpi_battery_get_property;
 563
 564         result = power_supply_register(&battery->device->dev, &battery->bat);
 565         if (result)
 566                 return result;
 567         return device_create_file(battery->bat.dev, &alarm_attr);
 568 }
 569
 570 static void sysfs_remove_battery(struct acpi_battery *battery)
 571 {
 572         if (!battery->bat.dev)
 573                 return;
 574         device_remove_file(battery->bat.dev, &alarm_attr);
 575         power_supply_unregister(&battery->bat);
 576         battery->bat.dev = NULL;
 577 }
 578
 579 static void acpi_battery_quirks(struct acpi_battery *battery)
 580 {
 581         if (dmi_name_in_vendors("Acer") && battery->power_unit) {
 582                 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags);
 583         }
 584 }
 585
 586 /*
 587  * According to the ACPI spec, some kinds of primary batteries can
 588  * report percentage battery remaining capacity directly to OS.
 589  * In this case, it reports the Last Full Charged Capacity == 100
 590  * and BatteryPresentRate == 0xFFFFFFFF.
 591  *
 592  * Now we found some battery reports percentage remaining capacity
 593  * even if it's rechargeable.
 594  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 595  *
 596  * Handle this correctly so that they won't break userspace.
 597  */
 598 static void acpi_battery_quirks2(struct acpi_battery *battery)
 599 {
 600         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 601                 return ;
 602
 603         if (battery->full_charge_capacity == 100 &&
 604             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
 605             battery->capacity_now >=0 && battery->capacity_now <= 100) {
 606                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
 607                 battery->full_charge_capacity = battery->design_capacity;
 608                 battery->capacity_now = (battery->capacity_now *
 609                                 battery->full_charge_capacity) / 100;
 610         }
 611 }
 612
 613 static int acpi_battery_update(struct acpi_battery *battery)
 614 {
 615         int result, old_present = acpi_battery_present(battery);
 616         result = acpi_battery_get_status(battery);
 617         if (result)
 618                 return result;
 619         if (!acpi_battery_present(battery)) {
 620                 sysfs_remove_battery(battery);
 621                 battery->update_time = 0;
 622                 return 0;
 623         }
 624         if (!battery->update_time ||
 625             old_present != acpi_battery_present(battery)) {
 626                 result = acpi_battery_get_info(battery);
 627                 if (result)
 628                         return result;
 629                 acpi_battery_quirks(battery);
 630                 acpi_battery_init_alarm(battery);
 631         }
 632         if (!battery->bat.dev)
 633                 sysfs_add_battery(battery);
 634         result = acpi_battery_get_state(battery);
 635         acpi_battery_quirks2(battery);
 636         return result;
 637 }
 638
 639 /* --------------------------------------------------------------------------
 640                               FS Interface (/proc)
 641    -------------------------------------------------------------------------- */
 642
 643 #ifdef CONFIG_ACPI_PROCFS_POWER
 644 static struct proc_dir_entry *acpi_battery_dir;
 645
 646 static int acpi_battery_print_info(struct seq_file *seq, int result)
 647 {
 648         struct acpi_battery *battery = seq->private;
 649
 650         if (result)
 651                 goto end;
 652
 653         seq_printf(seq, "present:                 %s\n",
 654                    acpi_battery_present(battery)?"yes":"no");
 655         if (!acpi_battery_present(battery))
 656                 goto end;
 657         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 658                 seq_printf(seq, "design capacity:         unknown\n");
 659         else
 660                 seq_printf(seq, "design capacity:         %d %sh\n",
 661                            battery->design_capacity,
 662                            acpi_battery_units(battery));
 663
 664         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 665                 seq_printf(seq, "last full capacity:      unknown\n");
 666         else
 667                 seq_printf(seq, "last full capacity:      %d %sh\n",
 668                            battery->full_charge_capacity,
 669                            acpi_battery_units(battery));
 670
 671         seq_printf(seq, "battery technology:      %srechargeable\n",
 672                    (!battery->technology)?"non-":"");
 673
 674         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 675                 seq_printf(seq, "design voltage:          unknown\n");
 676         else
 677                 seq_printf(seq, "design voltage:          %d mV\n",
 678                            battery->design_voltage);
 679         seq_printf(seq, "design capacity warning: %d %sh\n",
 680                    battery->design_capacity_warning,
 681                    acpi_battery_units(battery));
 682         seq_printf(seq, "design capacity low:     %d %sh\n",
 683                    battery->design_capacity_low,
 684                    acpi_battery_units(battery));
 685         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 686         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 687                    battery->capacity_granularity_1,
 688                    acpi_battery_units(battery));
 689         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 690                    battery->capacity_granularity_2,
 691                    acpi_battery_units(battery));
 692         seq_printf(seq, "model number:            %s\n", battery->model_number);
 693         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 694         seq_printf(seq, "battery type:            %s\n", battery->type);
 695         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 696       end:
 697         if (result)
 698                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 699         return result;
 700 }
 701
 702 static int acpi_battery_print_state(struct seq_file *seq, int result)
 703 {
 704         struct acpi_battery *battery = seq->private;
 705
 706         if (result)
 707                 goto end;
 708
 709         seq_printf(seq, "present:                 %s\n",
 710                    acpi_battery_present(battery)?"yes":"no");
 711         if (!acpi_battery_present(battery))
 712                 goto end;
 713
 714         seq_printf(seq, "capacity state:          %s\n",
 715                         (battery->state & 0x04)?"critical":"ok");
 716         if ((battery->state & 0x01) && (battery->state & 0x02))
 717                 seq_printf(seq,
 718                            "charging state:          charging/discharging\n");
 719         else if (battery->state & 0x01)
 720                 seq_printf(seq, "charging state:          discharging\n");
 721         else if (battery->state & 0x02)
 722                 seq_printf(seq, "charging state:          charging\n");
 723         else
 724                 seq_printf(seq, "charging state:          charged\n");
 725
 726         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 727                 seq_printf(seq, "present rate:            unknown\n");
 728         else
 729                 seq_printf(seq, "present rate:            %d %s\n",
 730                            battery->rate_now, acpi_battery_units(battery));
 731
 732         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 733                 seq_printf(seq, "remaining capacity:      unknown\n");
 734         else
 735                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 736                            battery->capacity_now, acpi_battery_units(battery));
 737         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 738                 seq_printf(seq, "present voltage:         unknown\n");
 739         else
 740                 seq_printf(seq, "present voltage:         %d mV\n",
 741                            battery->voltage_now);
 742       end:
 743         if (result)
 744                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 745
 746         return result;
 747 }
 748
 749 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 750 {
 751         struct acpi_battery *battery = seq->private;
 752
 753         if (result)
 754                 goto end;
 755
 756         if (!acpi_battery_present(battery)) {
 757                 seq_printf(seq, "present:                 no\n");
 758                 goto end;
 759         }
 760         seq_printf(seq, "alarm:                   ");
 761         if (!battery->alarm)
 762                 seq_printf(seq, "unsupported\n");
 763         else
 764                 seq_printf(seq, "%u %sh\n", battery->alarm,
 765                                 acpi_battery_units(battery));
 766       end:
 767         if (result)
 768                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 769         return result;
 770 }
 771
 772 static ssize_t acpi_battery_write_alarm(struct file *file,
 773                                         const char __user * buffer,
 774                                         size_t count, loff_t * ppos)
 775 {
 776         int result = 0;
 777         char alarm_string[12] = { '\0' };
 778         struct seq_file *m = file->private_data;
 779         struct acpi_battery *battery = m->private;
 780
 781         if (!battery || (count > sizeof(alarm_string) - 1))
 782                 return -EINVAL;
 783         if (!acpi_battery_present(battery)) {
 784                 result = -ENODEV;
 785                 goto end;
 786         }
 787         if (copy_from_user(alarm_string, buffer, count)) {
 788                 result = -EFAULT;
 789                 goto end;
 790         }
 791         alarm_string[count] = '\0';
 792         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 793         result = acpi_battery_set_alarm(battery);
 794       end:
 795         if (!result)
 796                 return count;
 797         return result;
 798 }
 799
 800 typedef int(*print_func)(struct seq_file *seq, int result);
 801
 802 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 803         acpi_battery_print_info,
 804         acpi_battery_print_state,
 805         acpi_battery_print_alarm,
 806 };
 807
 808 static int acpi_battery_read(int fid, struct seq_file *seq)
 809 {
 810         struct acpi_battery *battery = seq->private;
 811         int result = acpi_battery_update(battery);
 812         return acpi_print_funcs[fid](seq, result);
 813 }
 814
 815 #define DECLARE_FILE_FUNCTIONS(_name) \
 816 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 817 { \
 818         return acpi_battery_read(_name##_tag, seq); \
 819 } \
 820 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 821 { \
 822         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 823 }
 824
 825 DECLARE_FILE_FUNCTIONS(info);
 826 DECLARE_FILE_FUNCTIONS(state);
 827 DECLARE_FILE_FUNCTIONS(alarm);
 828
 829 #undef DECLARE_FILE_FUNCTIONS
 830
 831 #define FILE_DESCRIPTION_RO(_name) \
 832         { \
 833         .name = __stringify(_name), \
 834         .mode = S_IRUGO, \
 835         .ops = { \
 836                 .open = acpi_battery_##_name##_open_fs, \
 837                 .read = seq_read, \
 838                 .llseek = seq_lseek, \
 839                 .release = single_release, \
 840                 .owner = THIS_MODULE, \
 841                 }, \
 842         }
 843
 844 #define FILE_DESCRIPTION_RW(_name) \
 845         { \
 846         .name = __stringify(_name), \
 847         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 848         .ops = { \
 849                 .open = acpi_battery_##_name##_open_fs, \
 850                 .read = seq_read, \
 851                 .llseek = seq_lseek, \
 852                 .write = acpi_battery_write_##_name, \
 853                 .release = single_release, \
 854                 .owner = THIS_MODULE, \
 855                 }, \
 856         }
 857
 858 static struct battery_file {
 859         struct file_operations ops;
 860         mode_t mode;
 861         const char *name;
 862 } acpi_battery_file[] = {
 863         FILE_DESCRIPTION_RO(info),
 864         FILE_DESCRIPTION_RO(state),
 865         FILE_DESCRIPTION_RW(alarm),
 866 };
 867
 868 #undef FILE_DESCRIPTION_RO
 869 #undef FILE_DESCRIPTION_RW
 870
 871 static int acpi_battery_add_fs(struct acpi_device *device)
 872 {
 873         struct proc_dir_entry *entry = NULL;
 874         int i;
 875
 876         if (!acpi_device_dir(device)) {
 877                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 878                                                      acpi_battery_dir);
 879                 if (!acpi_device_dir(device))
 880                         return -ENODEV;
 881         }
 882
 883         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 884                 entry = proc_create_data(acpi_battery_file[i].name,
 885                                          acpi_battery_file[i].mode,
 886                                          acpi_device_dir(device),
 887                                          &acpi_battery_file[i].ops,
 888                                          acpi_driver_data(device));
 889                 if (!entry)
 890                         return -ENODEV;
 891         }
 892         return 0;
 893 }
 894
 895 static void acpi_battery_remove_fs(struct acpi_device *device)
 896 {
 897         int i;
 898         if (!acpi_device_dir(device))
 899                 return;
 900         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 901                 remove_proc_entry(acpi_battery_file[i].name,
 902                                   acpi_device_dir(device));
 903
 904         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 905         acpi_device_dir(device) = NULL;
 906 }
 907
 908 #endif
 909
 910 /* --------------------------------------------------------------------------
 911                                  Driver Interface
 912    -------------------------------------------------------------------------- */
 913
 914 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 915 {
 916         struct acpi_battery *battery = acpi_driver_data(device);
 917         struct device *old;
 918
 919         if (!battery)
 920                 return;
 921         old = battery->bat.dev;
 922         acpi_battery_update(battery);
 923         acpi_bus_generate_proc_event(device, event,
 924                                      acpi_battery_present(battery));
 925         acpi_bus_generate_netlink_event(device->pnp.device_class,
 926                                         dev_name(&device->dev), event,
 927                                         acpi_battery_present(battery));
 928         /* acpi_battery_update could remove power_supply object */
 929         if (old && battery->bat.dev)
 930                 power_supply_changed(&battery->bat);
 931 }
 932
 933 static int acpi_battery_add(struct acpi_device *device)
 934 {
 935         int result = 0;
 936         struct acpi_battery *battery = NULL;
 937         acpi_handle handle;
 938         if (!device)
 939                 return -EINVAL;
 940         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 941         if (!battery)
 942                 return -ENOMEM;
 943         battery->device = device;
 944         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 945         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 946         device->driver_data = battery;
 947         mutex_init(&battery->lock);
 948         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
 949                         "_BIX", &handle)))
 950                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
 951         acpi_battery_update(battery);
 952 #ifdef CONFIG_ACPI_PROCFS_POWER
 953         result = acpi_battery_add_fs(device);
 954 #endif
 955         if (!result) {
 956                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 957                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 958                         device->status.battery_present ? "present" : "absent");
 959         } else {
 960 #ifdef CONFIG_ACPI_PROCFS_POWER
 961                 acpi_battery_remove_fs(device);
 962 #endif
 963                 kfree(battery);
 964         }
 965         return result;
 966 }
 967
 968 static int acpi_battery_remove(struct acpi_device *device, int type)
 969 {
 970         struct acpi_battery *battery = NULL;
 971
 972         if (!device || !acpi_driver_data(device))
 973                 return -EINVAL;
 974         battery = acpi_driver_data(device);
 975 #ifdef CONFIG_ACPI_PROCFS_POWER
 976         acpi_battery_remove_fs(device);
 977 #endif
 978         sysfs_remove_battery(battery);
 979         mutex_destroy(&battery->lock);
 980         kfree(battery);
 981         return 0;
 982 }
 983
 984 /* this is needed to learn about changes made in suspended state */
 985 static int acpi_battery_resume(struct acpi_device *device)
 986 {
 987         struct acpi_battery *battery;
 988         if (!device)
 989                 return -EINVAL;
 990         battery = acpi_driver_data(device);
 991         battery->update_time = 0;
 992         acpi_battery_update(battery);
 993         return 0;
 994 }
 995
 996 static struct acpi_driver acpi_battery_driver = {
 997         .name = "battery",
 998         .class = ACPI_BATTERY_CLASS,
 999         .ids = battery_device_ids,
1000         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1001         .ops = {
1002                 .add = acpi_battery_add,
1003                 .resume = acpi_battery_resume,
1004                 .remove = acpi_battery_remove,
1005                 .notify = acpi_battery_notify,
1006                 },
1007 };
1008
1009 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1010 {
1011         if (acpi_disabled)
1012                 return;
1013 #ifdef CONFIG_ACPI_PROCFS_POWER
1014         acpi_battery_dir = acpi_lock_battery_dir();
1015         if (!acpi_battery_dir)
1016                 return;
1017 #endif
1018         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1019 #ifdef CONFIG_ACPI_PROCFS_POWER
1020                 acpi_unlock_battery_dir(acpi_battery_dir);
1021 #endif
1022                 return;
1023         }
1024         return;
1025 }
1026
1027 static int __init acpi_battery_init(void)
1028 {
1029         async_schedule(acpi_battery_init_async, NULL);
1030         return 0;
1031 }
1032
1033 static void __exit acpi_battery_exit(void)
1034 {
1035         acpi_bus_unregister_driver(&acpi_battery_driver);
1036 #ifdef CONFIG_ACPI_PROCFS_POWER
1037         acpi_unlock_battery_dir(acpi_battery_dir);
1038 #endif
1039 }
1040
1041 module_init(acpi_battery_init);
1042 module_exit(acpi_battery_exit);