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 #include <linux/suspend.h>
  37
  38 #ifdef CONFIG_ACPI_PROCFS_POWER
  39 #include <linux/proc_fs.h>
  40 #include <linux/seq_file.h>
  41 #include <asm/uaccess.h>
  42 #endif
  43
  44 #include <acpi/acpi_bus.h>
  45 #include <acpi/acpi_drivers.h>
  46 #include <linux/power_supply.h>
  47
  48 #define PREFIX "ACPI: "
  49
  50 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  51
  52 #define ACPI_BATTERY_CLASS              "battery"
  53 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  54 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  55 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  56 #define ACPI_BATTERY_NOTIFY_THRESHOLD   0x82
  57
  58 /* Battery power unit: 0 means mW, 1 means mA */
  59 #define ACPI_BATTERY_POWER_UNIT_MA      1
  60
  61 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  62
  63 ACPI_MODULE_NAME("battery");
  64
  65 MODULE_AUTHOR("Paul Diefenbaugh");
  66 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  67 MODULE_DESCRIPTION("ACPI Battery Driver");
  68 MODULE_LICENSE("GPL");
  69
  70 static unsigned int cache_time = 1000;
  71 module_param(cache_time, uint, 0644);
  72 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  73
  74 #ifdef CONFIG_ACPI_PROCFS_POWER
  75 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  76 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  77
  78 enum acpi_battery_files {
  79         info_tag = 0,
  80         state_tag,
  81         alarm_tag,
  82         ACPI_BATTERY_NUMFILES,
  83 };
  84
  85 #endif
  86
  87 static const struct acpi_device_id battery_device_ids[] = {
  88         {"PNP0C0A", 0},
  89         {"", 0},
  90 };
  91
  92 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  93
  94 enum {
  95         ACPI_BATTERY_ALARM_PRESENT,
  96         ACPI_BATTERY_XINFO_PRESENT,
  97         ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY,
  98 };
  99
 100 struct acpi_battery {
 101         struct mutex lock;
 102         struct power_supply bat;
 103         struct acpi_device *device;
 104         struct notifier_block pm_nb;
 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 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 134
 135 inline int acpi_battery_present(struct acpi_battery *battery)
 136 {
 137         return battery->device->status.battery_present;
 138 }
 139
 140 static int acpi_battery_technology(struct acpi_battery *battery)
 141 {
 142         if (!strcasecmp("NiCd", battery->type))
 143                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 144         if (!strcasecmp("NiMH", battery->type))
 145                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 146         if (!strcasecmp("LION", battery->type))
 147                 return POWER_SUPPLY_TECHNOLOGY_LION;
 148         if (!strncasecmp("LI-ION", battery->type, 6))
 149                 return POWER_SUPPLY_TECHNOLOGY_LION;
 150         if (!strcasecmp("LiP", battery->type))
 151                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 152         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 153 }
 154
 155 static int acpi_battery_get_state(struct acpi_battery *battery);
 156
 157 static int acpi_battery_is_charged(struct acpi_battery *battery)
 158 {
 159         /* either charging or discharging */
 160         if (battery->state != 0)
 161                 return 0;
 162
 163         /* battery not reporting charge */
 164         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN ||
 165             battery->capacity_now == 0)
 166                 return 0;
 167
 168         /* good batteries update full_charge as the batteries degrade */
 169         if (battery->full_charge_capacity == battery->capacity_now)
 170                 return 1;
 171
 172         /* fallback to using design values for broken batteries */
 173         if (battery->design_capacity == battery->capacity_now)
 174                 return 1;
 175
 176         /* we don't do any sort of metric based on percentages */
 177         return 0;
 178 }
 179
 180 static int acpi_battery_get_property(struct power_supply *psy,
 181                                      enum power_supply_property psp,
 182                                      union power_supply_propval *val)
 183 {
 184         int ret = 0;
 185         struct acpi_battery *battery = to_acpi_battery(psy);
 186
 187         if (acpi_battery_present(battery)) {
 188                 /* run battery update only if it is present */
 189                 acpi_battery_get_state(battery);
 190         } else if (psp != POWER_SUPPLY_PROP_PRESENT)
 191                 return -ENODEV;
 192         switch (psp) {
 193         case POWER_SUPPLY_PROP_STATUS:
 194                 if (battery->state & 0x01)
 195                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 196                 else if (battery->state & 0x02)
 197                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 198                 else if (acpi_battery_is_charged(battery))
 199                         val->intval = POWER_SUPPLY_STATUS_FULL;
 200                 else
 201                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 202                 break;
 203         case POWER_SUPPLY_PROP_PRESENT:
 204                 val->intval = acpi_battery_present(battery);
 205                 break;
 206         case POWER_SUPPLY_PROP_TECHNOLOGY:
 207                 val->intval = acpi_battery_technology(battery);
 208                 break;
 209         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 210                 val->intval = battery->cycle_count;
 211                 break;
 212         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 213                 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 214                         ret = -ENODEV;
 215                 else
 216                         val->intval = battery->design_voltage * 1000;
 217                 break;
 218         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 219                 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 220                         ret = -ENODEV;
 221                 else
 222                         val->intval = battery->voltage_now * 1000;
 223                 break;
 224         case POWER_SUPPLY_PROP_CURRENT_NOW:
 225         case POWER_SUPPLY_PROP_POWER_NOW:
 226                 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 227                         ret = -ENODEV;
 228                 else
 229                         val->intval = battery->rate_now * 1000;
 230                 break;
 231         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 232         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 233                 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 234                         ret = -ENODEV;
 235                 else
 236                         val->intval = battery->design_capacity * 1000;
 237                 break;
 238         case POWER_SUPPLY_PROP_CHARGE_FULL:
 239         case POWER_SUPPLY_PROP_ENERGY_FULL:
 240                 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 241                         ret = -ENODEV;
 242                 else
 243                         val->intval = battery->full_charge_capacity * 1000;
 244                 break;
 245         case POWER_SUPPLY_PROP_CHARGE_NOW:
 246         case POWER_SUPPLY_PROP_ENERGY_NOW:
 247                 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 248                         ret = -ENODEV;
 249                 else
 250                         val->intval = battery->capacity_now * 1000;
 251                 break;
 252         case POWER_SUPPLY_PROP_MODEL_NAME:
 253                 val->strval = battery->model_number;
 254                 break;
 255         case POWER_SUPPLY_PROP_MANUFACTURER:
 256                 val->strval = battery->oem_info;
 257                 break;
 258         case POWER_SUPPLY_PROP_SERIAL_NUMBER:
 259                 val->strval = battery->serial_number;
 260                 break;
 261         default:
 262                 ret = -EINVAL;
 263         }
 264         return ret;
 265 }
 266
 267 static enum power_supply_property charge_battery_props[] = {
 268         POWER_SUPPLY_PROP_STATUS,
 269         POWER_SUPPLY_PROP_PRESENT,
 270         POWER_SUPPLY_PROP_TECHNOLOGY,
 271         POWER_SUPPLY_PROP_CYCLE_COUNT,
 272         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 273         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 274         POWER_SUPPLY_PROP_CURRENT_NOW,
 275         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 276         POWER_SUPPLY_PROP_CHARGE_FULL,
 277         POWER_SUPPLY_PROP_CHARGE_NOW,
 278         POWER_SUPPLY_PROP_MODEL_NAME,
 279         POWER_SUPPLY_PROP_MANUFACTURER,
 280         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 281 };
 282
 283 static enum power_supply_property energy_battery_props[] = {
 284         POWER_SUPPLY_PROP_STATUS,
 285         POWER_SUPPLY_PROP_PRESENT,
 286         POWER_SUPPLY_PROP_TECHNOLOGY,
 287         POWER_SUPPLY_PROP_CYCLE_COUNT,
 288         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 289         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 290         POWER_SUPPLY_PROP_POWER_NOW,
 291         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 292         POWER_SUPPLY_PROP_ENERGY_FULL,
 293         POWER_SUPPLY_PROP_ENERGY_NOW,
 294         POWER_SUPPLY_PROP_MODEL_NAME,
 295         POWER_SUPPLY_PROP_MANUFACTURER,
 296         POWER_SUPPLY_PROP_SERIAL_NUMBER,
 297 };
 298
 299 #ifdef CONFIG_ACPI_PROCFS_POWER
 300 inline char *acpi_battery_units(struct acpi_battery *battery)
 301 {
 302         return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ?
 303                 "mA" : "mW";
 304 }
 305 #endif
 306
 307 /* --------------------------------------------------------------------------
 308                                Battery Management
 309    -------------------------------------------------------------------------- */
 310 struct acpi_offsets {
 311         size_t offset;          /* offset inside struct acpi_sbs_battery */
 312         u8 mode;                /* int or string? */
 313 };
 314
 315 static struct acpi_offsets state_offsets[] = {
 316         {offsetof(struct acpi_battery, state), 0},
 317         {offsetof(struct acpi_battery, rate_now), 0},
 318         {offsetof(struct acpi_battery, capacity_now), 0},
 319         {offsetof(struct acpi_battery, voltage_now), 0},
 320 };
 321
 322 static struct acpi_offsets info_offsets[] = {
 323         {offsetof(struct acpi_battery, power_unit), 0},
 324         {offsetof(struct acpi_battery, design_capacity), 0},
 325         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 326         {offsetof(struct acpi_battery, technology), 0},
 327         {offsetof(struct acpi_battery, design_voltage), 0},
 328         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 329         {offsetof(struct acpi_battery, design_capacity_low), 0},
 330         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 331         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 332         {offsetof(struct acpi_battery, model_number), 1},
 333         {offsetof(struct acpi_battery, serial_number), 1},
 334         {offsetof(struct acpi_battery, type), 1},
 335         {offsetof(struct acpi_battery, oem_info), 1},
 336 };
 337
 338 static struct acpi_offsets extended_info_offsets[] = {
 339         {offsetof(struct acpi_battery, power_unit), 0},
 340         {offsetof(struct acpi_battery, design_capacity), 0},
 341         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 342         {offsetof(struct acpi_battery, technology), 0},
 343         {offsetof(struct acpi_battery, design_voltage), 0},
 344         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 345         {offsetof(struct acpi_battery, design_capacity_low), 0},
 346         {offsetof(struct acpi_battery, cycle_count), 0},
 347         {offsetof(struct acpi_battery, measurement_accuracy), 0},
 348         {offsetof(struct acpi_battery, max_sampling_time), 0},
 349         {offsetof(struct acpi_battery, min_sampling_time), 0},
 350         {offsetof(struct acpi_battery, max_averaging_interval), 0},
 351         {offsetof(struct acpi_battery, min_averaging_interval), 0},
 352         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 353         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 354         {offsetof(struct acpi_battery, model_number), 1},
 355         {offsetof(struct acpi_battery, serial_number), 1},
 356         {offsetof(struct acpi_battery, type), 1},
 357         {offsetof(struct acpi_battery, oem_info), 1},
 358 };
 359
 360 static int extract_package(struct acpi_battery *battery,
 361                            union acpi_object *package,
 362                            struct acpi_offsets *offsets, int num)
 363 {
 364         int i;
 365         union acpi_object *element;
 366         if (package->type != ACPI_TYPE_PACKAGE)
 367                 return -EFAULT;
 368         for (i = 0; i < num; ++i) {
 369                 if (package->package.count <= i)
 370                         return -EFAULT;
 371                 element = &package->package.elements[i];
 372                 if (offsets[i].mode) {
 373                         u8 *ptr = (u8 *)battery + offsets[i].offset;
 374                         if (element->type == ACPI_TYPE_STRING ||
 375                             element->type == ACPI_TYPE_BUFFER)
 376                                 strncpy(ptr, element->string.pointer, 32);
 377                         else if (element->type == ACPI_TYPE_INTEGER) {
 378                                 strncpy(ptr, (u8 *)&element->integer.value,
 379                                         sizeof(u64));
 380                                 ptr[sizeof(u64)] = 0;
 381                         } else
 382                                 *ptr = 0; /* don't have value */
 383                 } else {
 384                         int *x = (int *)((u8 *)battery + offsets[i].offset);
 385                         *x = (element->type == ACPI_TYPE_INTEGER) ?
 386                                 element->integer.value : -1;
 387                 }
 388         }
 389         return 0;
 390 }
 391
 392 static int acpi_battery_get_status(struct acpi_battery *battery)
 393 {
 394         if (acpi_bus_get_status(battery->device)) {
 395                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 396                 return -ENODEV;
 397         }
 398         return 0;
 399 }
 400
 401 static int acpi_battery_get_info(struct acpi_battery *battery)
 402 {
 403         int result = -EFAULT;
 404         acpi_status status = 0;
 405         char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)?
 406                         "_BIX" : "_BIF";
 407
 408         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 409
 410         if (!acpi_battery_present(battery))
 411                 return 0;
 412         mutex_lock(&battery->lock);
 413         status = acpi_evaluate_object(battery->device->handle, name,
 414                                                 NULL, &buffer);
 415         mutex_unlock(&battery->lock);
 416
 417         if (ACPI_FAILURE(status)) {
 418                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
 419                 return -ENODEV;
 420         }
 421         if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
 422                 result = extract_package(battery, buffer.pointer,
 423                                 extended_info_offsets,
 424                                 ARRAY_SIZE(extended_info_offsets));
 425         else
 426                 result = extract_package(battery, buffer.pointer,
 427                                 info_offsets, ARRAY_SIZE(info_offsets));
 428         kfree(buffer.pointer);
 429         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 430                 battery->full_charge_capacity = battery->design_capacity;
 431         return result;
 432 }
 433
 434 static int acpi_battery_get_state(struct acpi_battery *battery)
 435 {
 436         int result = 0;
 437         acpi_status status = 0;
 438         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 439
 440         if (!acpi_battery_present(battery))
 441                 return 0;
 442
 443         if (battery->update_time &&
 444             time_before(jiffies, battery->update_time +
 445                         msecs_to_jiffies(cache_time)))
 446                 return 0;
 447
 448         mutex_lock(&battery->lock);
 449         status = acpi_evaluate_object(battery->device->handle, "_BST",
 450                                       NULL, &buffer);
 451         mutex_unlock(&battery->lock);
 452
 453         if (ACPI_FAILURE(status)) {
 454                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 455                 return -ENODEV;
 456         }
 457
 458         result = extract_package(battery, buffer.pointer,
 459                                  state_offsets, ARRAY_SIZE(state_offsets));
 460         battery->update_time = jiffies;
 461         kfree(buffer.pointer);
 462
 463         /* For buggy DSDTs that report negative 16-bit values for either
 464          * charging or discharging current and/or report 0 as 65536
 465          * due to bad math.
 466          */
 467         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA &&
 468                 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN &&
 469                 (s16)(battery->rate_now) < 0) {
 470                 battery->rate_now = abs((s16)battery->rate_now);
 471                 printk_once(KERN_WARNING FW_BUG "battery: (dis)charge rate"
 472                         " invalid.\n");
 473         }
 474
 475         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)
 476             && battery->capacity_now >= 0 && battery->capacity_now <= 100)
 477                 battery->capacity_now = (battery->capacity_now *
 478                                 battery->full_charge_capacity) / 100;
 479         return result;
 480 }
 481
 482 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 483 {
 484         acpi_status status = 0;
 485         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 486         struct acpi_object_list arg_list = { 1, &arg0 };
 487
 488         if (!acpi_battery_present(battery) ||
 489             !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags))
 490                 return -ENODEV;
 491
 492         arg0.integer.value = battery->alarm;
 493
 494         mutex_lock(&battery->lock);
 495         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 496                                  &arg_list, NULL);
 497         mutex_unlock(&battery->lock);
 498
 499         if (ACPI_FAILURE(status))
 500                 return -ENODEV;
 501
 502         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 503         return 0;
 504 }
 505
 506 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 507 {
 508         acpi_status status = AE_OK;
 509         acpi_handle handle = NULL;
 510
 511         /* See if alarms are supported, and if so, set default */
 512         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 513         if (ACPI_FAILURE(status)) {
 514                 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 515                 return 0;
 516         }
 517         set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags);
 518         if (!battery->alarm)
 519                 battery->alarm = battery->design_capacity_warning;
 520         return acpi_battery_set_alarm(battery);
 521 }
 522
 523 static ssize_t acpi_battery_alarm_show(struct device *dev,
 524                                         struct device_attribute *attr,
 525                                         char *buf)
 526 {
 527         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 528         return sprintf(buf, "%d\n", battery->alarm * 1000);
 529 }
 530
 531 static ssize_t acpi_battery_alarm_store(struct device *dev,
 532                                         struct device_attribute *attr,
 533                                         const char *buf, size_t count)
 534 {
 535         unsigned long x;
 536         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 537         if (sscanf(buf, "%ld\n", &x) == 1)
 538                 battery->alarm = x/1000;
 539         if (acpi_battery_present(battery))
 540                 acpi_battery_set_alarm(battery);
 541         return count;
 542 }
 543
 544 static struct device_attribute alarm_attr = {
 545         .attr = {.name = "alarm", .mode = 0644},
 546         .show = acpi_battery_alarm_show,
 547         .store = acpi_battery_alarm_store,
 548 };
 549
 550 static int sysfs_add_battery(struct acpi_battery *battery)
 551 {
 552         int result;
 553
 554         if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) {
 555                 battery->bat.properties = charge_battery_props;
 556                 battery->bat.num_properties =
 557                         ARRAY_SIZE(charge_battery_props);
 558         } else {
 559                 battery->bat.properties = energy_battery_props;
 560                 battery->bat.num_properties =
 561                         ARRAY_SIZE(energy_battery_props);
 562         }
 563
 564         battery->bat.name = acpi_device_bid(battery->device);
 565         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 566         battery->bat.get_property = acpi_battery_get_property;
 567
 568         result = power_supply_register(&battery->device->dev, &battery->bat);
 569         if (result)
 570                 return result;
 571         return device_create_file(battery->bat.dev, &alarm_attr);
 572 }
 573
 574 static void sysfs_remove_battery(struct acpi_battery *battery)
 575 {
 576         if (!battery->bat.dev)
 577                 return;
 578         device_remove_file(battery->bat.dev, &alarm_attr);
 579         power_supply_unregister(&battery->bat);
 580         battery->bat.dev = NULL;
 581 }
 582
 583 /*
 584  * According to the ACPI spec, some kinds of primary batteries can
 585  * report percentage battery remaining capacity directly to OS.
 586  * In this case, it reports the Last Full Charged Capacity == 100
 587  * and BatteryPresentRate == 0xFFFFFFFF.
 588  *
 589  * Now we found some battery reports percentage remaining capacity
 590  * even if it's rechargeable.
 591  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 592  *
 593  * Handle this correctly so that they won't break userspace.
 594  */
 595 static void acpi_battery_quirks(struct acpi_battery *battery)
 596 {
 597         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 598                 return ;
 599
 600         if (battery->full_charge_capacity == 100 &&
 601             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
 602             battery->capacity_now >=0 && battery->capacity_now <= 100) {
 603                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
 604                 battery->full_charge_capacity = battery->design_capacity;
 605                 battery->capacity_now = (battery->capacity_now *
 606                                 battery->full_charge_capacity) / 100;
 607         }
 608 }
 609
 610 static int acpi_battery_update(struct acpi_battery *battery)
 611 {
 612         int result, old_present = acpi_battery_present(battery);
 613         result = acpi_battery_get_status(battery);
 614         if (result)
 615                 return result;
 616         if (!acpi_battery_present(battery)) {
 617                 sysfs_remove_battery(battery);
 618                 battery->update_time = 0;
 619                 return 0;
 620         }
 621         if (!battery->update_time ||
 622             old_present != acpi_battery_present(battery)) {
 623                 result = acpi_battery_get_info(battery);
 624                 if (result)
 625                         return result;
 626                 acpi_battery_init_alarm(battery);
 627         }
 628         if (!battery->bat.dev)
 629                 sysfs_add_battery(battery);
 630         result = acpi_battery_get_state(battery);
 631         acpi_battery_quirks(battery);
 632         return result;
 633 }
 634
 635 static void acpi_battery_refresh(struct acpi_battery *battery)
 636 {
 637         if (!battery->bat.dev)
 638                 return;
 639
 640         acpi_battery_get_info(battery);
 641         /* The battery may have changed its reporting units. */
 642         sysfs_remove_battery(battery);
 643         sysfs_add_battery(battery);
 644 }
 645
 646 /* --------------------------------------------------------------------------
 647                               FS Interface (/proc)
 648    -------------------------------------------------------------------------- */
 649
 650 #ifdef CONFIG_ACPI_PROCFS_POWER
 651 static struct proc_dir_entry *acpi_battery_dir;
 652
 653 static int acpi_battery_print_info(struct seq_file *seq, int result)
 654 {
 655         struct acpi_battery *battery = seq->private;
 656
 657         if (result)
 658                 goto end;
 659
 660         seq_printf(seq, "present:                 %s\n",
 661                    acpi_battery_present(battery)?"yes":"no");
 662         if (!acpi_battery_present(battery))
 663                 goto end;
 664         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 665                 seq_printf(seq, "design capacity:         unknown\n");
 666         else
 667                 seq_printf(seq, "design capacity:         %d %sh\n",
 668                            battery->design_capacity,
 669                            acpi_battery_units(battery));
 670
 671         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 672                 seq_printf(seq, "last full capacity:      unknown\n");
 673         else
 674                 seq_printf(seq, "last full capacity:      %d %sh\n",
 675                            battery->full_charge_capacity,
 676                            acpi_battery_units(battery));
 677
 678         seq_printf(seq, "battery technology:      %srechargeable\n",
 679                    (!battery->technology)?"non-":"");
 680
 681         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 682                 seq_printf(seq, "design voltage:          unknown\n");
 683         else
 684                 seq_printf(seq, "design voltage:          %d mV\n",
 685                            battery->design_voltage);
 686         seq_printf(seq, "design capacity warning: %d %sh\n",
 687                    battery->design_capacity_warning,
 688                    acpi_battery_units(battery));
 689         seq_printf(seq, "design capacity low:     %d %sh\n",
 690                    battery->design_capacity_low,
 691                    acpi_battery_units(battery));
 692         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 693         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 694                    battery->capacity_granularity_1,
 695                    acpi_battery_units(battery));
 696         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 697                    battery->capacity_granularity_2,
 698                    acpi_battery_units(battery));
 699         seq_printf(seq, "model number:            %s\n", battery->model_number);
 700         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 701         seq_printf(seq, "battery type:            %s\n", battery->type);
 702         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 703       end:
 704         if (result)
 705                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 706         return result;
 707 }
 708
 709 static int acpi_battery_print_state(struct seq_file *seq, int result)
 710 {
 711         struct acpi_battery *battery = seq->private;
 712
 713         if (result)
 714                 goto end;
 715
 716         seq_printf(seq, "present:                 %s\n",
 717                    acpi_battery_present(battery)?"yes":"no");
 718         if (!acpi_battery_present(battery))
 719                 goto end;
 720
 721         seq_printf(seq, "capacity state:          %s\n",
 722                         (battery->state & 0x04)?"critical":"ok");
 723         if ((battery->state & 0x01) && (battery->state & 0x02))
 724                 seq_printf(seq,
 725                            "charging state:          charging/discharging\n");
 726         else if (battery->state & 0x01)
 727                 seq_printf(seq, "charging state:          discharging\n");
 728         else if (battery->state & 0x02)
 729                 seq_printf(seq, "charging state:          charging\n");
 730         else
 731                 seq_printf(seq, "charging state:          charged\n");
 732
 733         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 734                 seq_printf(seq, "present rate:            unknown\n");
 735         else
 736                 seq_printf(seq, "present rate:            %d %s\n",
 737                            battery->rate_now, acpi_battery_units(battery));
 738
 739         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 740                 seq_printf(seq, "remaining capacity:      unknown\n");
 741         else
 742                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 743                            battery->capacity_now, acpi_battery_units(battery));
 744         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 745                 seq_printf(seq, "present voltage:         unknown\n");
 746         else
 747                 seq_printf(seq, "present voltage:         %d mV\n",
 748                            battery->voltage_now);
 749       end:
 750         if (result)
 751                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 752
 753         return result;
 754 }
 755
 756 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 757 {
 758         struct acpi_battery *battery = seq->private;
 759
 760         if (result)
 761                 goto end;
 762
 763         if (!acpi_battery_present(battery)) {
 764                 seq_printf(seq, "present:                 no\n");
 765                 goto end;
 766         }
 767         seq_printf(seq, "alarm:                   ");
 768         if (!battery->alarm)
 769                 seq_printf(seq, "unsupported\n");
 770         else
 771                 seq_printf(seq, "%u %sh\n", battery->alarm,
 772                                 acpi_battery_units(battery));
 773       end:
 774         if (result)
 775                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 776         return result;
 777 }
 778
 779 static ssize_t acpi_battery_write_alarm(struct file *file,
 780                                         const char __user * buffer,
 781                                         size_t count, loff_t * ppos)
 782 {
 783         int result = 0;
 784         char alarm_string[12] = { '\0' };
 785         struct seq_file *m = file->private_data;
 786         struct acpi_battery *battery = m->private;
 787
 788         if (!battery || (count > sizeof(alarm_string) - 1))
 789                 return -EINVAL;
 790         if (!acpi_battery_present(battery)) {
 791                 result = -ENODEV;
 792                 goto end;
 793         }
 794         if (copy_from_user(alarm_string, buffer, count)) {
 795                 result = -EFAULT;
 796                 goto end;
 797         }
 798         alarm_string[count] = '\0';
 799         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 800         result = acpi_battery_set_alarm(battery);
 801       end:
 802         if (!result)
 803                 return count;
 804         return result;
 805 }
 806
 807 typedef int(*print_func)(struct seq_file *seq, int result);
 808
 809 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 810         acpi_battery_print_info,
 811         acpi_battery_print_state,
 812         acpi_battery_print_alarm,
 813 };
 814
 815 static int acpi_battery_read(int fid, struct seq_file *seq)
 816 {
 817         struct acpi_battery *battery = seq->private;
 818         int result = acpi_battery_update(battery);
 819         return acpi_print_funcs[fid](seq, result);
 820 }
 821
 822 #define DECLARE_FILE_FUNCTIONS(_name) \
 823 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 824 { \
 825         return acpi_battery_read(_name##_tag, seq); \
 826 } \
 827 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 828 { \
 829         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 830 }
 831
 832 DECLARE_FILE_FUNCTIONS(info);
 833 DECLARE_FILE_FUNCTIONS(state);
 834 DECLARE_FILE_FUNCTIONS(alarm);
 835
 836 #undef DECLARE_FILE_FUNCTIONS
 837
 838 #define FILE_DESCRIPTION_RO(_name) \
 839         { \
 840         .name = __stringify(_name), \
 841         .mode = S_IRUGO, \
 842         .ops = { \
 843                 .open = acpi_battery_##_name##_open_fs, \
 844                 .read = seq_read, \
 845                 .llseek = seq_lseek, \
 846                 .release = single_release, \
 847                 .owner = THIS_MODULE, \
 848                 }, \
 849         }
 850
 851 #define FILE_DESCRIPTION_RW(_name) \
 852         { \
 853         .name = __stringify(_name), \
 854         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 855         .ops = { \
 856                 .open = acpi_battery_##_name##_open_fs, \
 857                 .read = seq_read, \
 858                 .llseek = seq_lseek, \
 859                 .write = acpi_battery_write_##_name, \
 860                 .release = single_release, \
 861                 .owner = THIS_MODULE, \
 862                 }, \
 863         }
 864
 865 static struct battery_file {
 866         struct file_operations ops;
 867         mode_t mode;
 868         const char *name;
 869 } acpi_battery_file[] = {
 870         FILE_DESCRIPTION_RO(info),
 871         FILE_DESCRIPTION_RO(state),
 872         FILE_DESCRIPTION_RW(alarm),
 873 };
 874
 875 #undef FILE_DESCRIPTION_RO
 876 #undef FILE_DESCRIPTION_RW
 877
 878 static int acpi_battery_add_fs(struct acpi_device *device)
 879 {
 880         struct proc_dir_entry *entry = NULL;
 881         int i;
 882
 883         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
 884                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 885         if (!acpi_device_dir(device)) {
 886                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 887                                                      acpi_battery_dir);
 888                 if (!acpi_device_dir(device))
 889                         return -ENODEV;
 890         }
 891
 892         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 893                 entry = proc_create_data(acpi_battery_file[i].name,
 894                                          acpi_battery_file[i].mode,
 895                                          acpi_device_dir(device),
 896                                          &acpi_battery_file[i].ops,
 897                                          acpi_driver_data(device));
 898                 if (!entry)
 899                         return -ENODEV;
 900         }
 901         return 0;
 902 }
 903
 904 static void acpi_battery_remove_fs(struct acpi_device *device)
 905 {
 906         int i;
 907         if (!acpi_device_dir(device))
 908                 return;
 909         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 910                 remove_proc_entry(acpi_battery_file[i].name,
 911                                   acpi_device_dir(device));
 912
 913         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 914         acpi_device_dir(device) = NULL;
 915 }
 916
 917 #endif
 918
 919 /* --------------------------------------------------------------------------
 920                                  Driver Interface
 921    -------------------------------------------------------------------------- */
 922
 923 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 924 {
 925         struct acpi_battery *battery = acpi_driver_data(device);
 926         struct device *old;
 927
 928         if (!battery)
 929                 return;
 930         old = battery->bat.dev;
 931         if (event == ACPI_BATTERY_NOTIFY_INFO)
 932                 acpi_battery_refresh(battery);
 933         acpi_battery_update(battery);
 934         acpi_bus_generate_proc_event(device, event,
 935                                      acpi_battery_present(battery));
 936         acpi_bus_generate_netlink_event(device->pnp.device_class,
 937                                         dev_name(&device->dev), event,
 938                                         acpi_battery_present(battery));
 939         /* acpi_battery_update could remove power_supply object */
 940         if (old && battery->bat.dev)
 941                 power_supply_changed(&battery->bat);
 942 }
 943
 944 static int battery_notify(struct notifier_block *nb,
 945                                unsigned long mode, void *_unused)
 946 {
 947         struct acpi_battery *battery = container_of(nb, struct acpi_battery,
 948                                                     pm_nb);
 949         switch (mode) {
 950         case PM_POST_HIBERNATION:
 951         case PM_POST_SUSPEND:
 952                 sysfs_remove_battery(battery);
 953                 sysfs_add_battery(battery);
 954                 break;
 955         }
 956
 957         return 0;
 958 }
 959
 960 static int acpi_battery_add(struct acpi_device *device)
 961 {
 962         int result = 0;
 963         struct acpi_battery *battery = NULL;
 964         acpi_handle handle;
 965         if (!device)
 966                 return -EINVAL;
 967         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 968         if (!battery)
 969                 return -ENOMEM;
 970         battery->device = device;
 971         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 972         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 973         device->driver_data = battery;
 974         mutex_init(&battery->lock);
 975         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
 976                         "_BIX", &handle)))
 977                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
 978         acpi_battery_update(battery);
 979 #ifdef CONFIG_ACPI_PROCFS_POWER
 980         result = acpi_battery_add_fs(device);
 981 #endif
 982         if (!result) {
 983                 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 984                         ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 985                         device->status.battery_present ? "present" : "absent");
 986         } else {
 987 #ifdef CONFIG_ACPI_PROCFS_POWER
 988                 acpi_battery_remove_fs(device);
 989 #endif
 990                 kfree(battery);
 991         }
 992
 993         battery->pm_nb.notifier_call = battery_notify;
 994         register_pm_notifier(&battery->pm_nb);
 995
 996         return result;
 997 }
 998
 999 static int acpi_battery_remove(struct acpi_device *device, int type)
1000 {
1001         struct acpi_battery *battery = NULL;
1002
1003         if (!device || !acpi_driver_data(device))
1004                 return -EINVAL;
1005         battery = acpi_driver_data(device);
1006         unregister_pm_notifier(&battery->pm_nb);
1007 #ifdef CONFIG_ACPI_PROCFS_POWER
1008         acpi_battery_remove_fs(device);
1009 #endif
1010         sysfs_remove_battery(battery);
1011         mutex_destroy(&battery->lock);
1012         kfree(battery);
1013         return 0;
1014 }
1015
1016 /* this is needed to learn about changes made in suspended state */
1017 static int acpi_battery_resume(struct acpi_device *device)
1018 {
1019         struct acpi_battery *battery;
1020         if (!device)
1021                 return -EINVAL;
1022         battery = acpi_driver_data(device);
1023         battery->update_time = 0;
1024         acpi_battery_update(battery);
1025         return 0;
1026 }
1027
1028 static struct acpi_driver acpi_battery_driver = {
1029         .name = "battery",
1030         .class = ACPI_BATTERY_CLASS,
1031         .ids = battery_device_ids,
1032         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1033         .ops = {
1034                 .add = acpi_battery_add,
1035                 .resume = acpi_battery_resume,
1036                 .remove = acpi_battery_remove,
1037                 .notify = acpi_battery_notify,
1038                 },
1039 };
1040
1041 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1042 {
1043         if (acpi_disabled)
1044                 return;
1045 #ifdef CONFIG_ACPI_PROCFS_POWER
1046         acpi_battery_dir = acpi_lock_battery_dir();
1047         if (!acpi_battery_dir)
1048                 return;
1049 #endif
1050         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1051 #ifdef CONFIG_ACPI_PROCFS_POWER
1052                 acpi_unlock_battery_dir(acpi_battery_dir);
1053 #endif
1054                 return;
1055         }
1056         return;
1057 }
1058
1059 static int __init acpi_battery_init(void)
1060 {
1061         async_schedule(acpi_battery_init_async, NULL);
1062         return 0;
1063 }
1064
1065 static void __exit acpi_battery_exit(void)
1066 {
1067         acpi_bus_unregister_driver(&acpi_battery_driver);
1068 #ifdef CONFIG_ACPI_PROCFS_POWER
1069         acpi_unlock_battery_dir(acpi_battery_dir);
1070 #endif
1071 }
1072
1073 module_init(acpi_battery_init);
1074 module_exit(acpi_battery_exit);