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         mutex_lock(&battery->lock);
 577         if (!battery->bat.dev) {
 578                 mutex_unlock(&battery->lock);
 579                 return;
 580         }
 581
 582         device_remove_file(battery->bat.dev, &alarm_attr);
 583         power_supply_unregister(&battery->bat);
 584         battery->bat.dev = NULL;
 585         mutex_unlock(&battery->lock);
 586 }
 587
 588 /*
 589  * According to the ACPI spec, some kinds of primary batteries can
 590  * report percentage battery remaining capacity directly to OS.
 591  * In this case, it reports the Last Full Charged Capacity == 100
 592  * and BatteryPresentRate == 0xFFFFFFFF.
 593  *
 594  * Now we found some battery reports percentage remaining capacity
 595  * even if it's rechargeable.
 596  * https://bugzilla.kernel.org/show_bug.cgi?id=15979
 597  *
 598  * Handle this correctly so that they won't break userspace.
 599  */
 600 static void acpi_battery_quirks(struct acpi_battery *battery)
 601 {
 602         if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags))
 603                 return ;
 604
 605         if (battery->full_charge_capacity == 100 &&
 606             battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN &&
 607             battery->capacity_now >=0 && battery->capacity_now <= 100) {
 608                 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags);
 609                 battery->full_charge_capacity = battery->design_capacity;
 610                 battery->capacity_now = (battery->capacity_now *
 611                                 battery->full_charge_capacity) / 100;
 612         }
 613 }
 614
 615 static int acpi_battery_update(struct acpi_battery *battery)
 616 {
 617         int result, old_present = acpi_battery_present(battery);
 618         result = acpi_battery_get_status(battery);
 619         if (result)
 620                 return result;
 621         if (!acpi_battery_present(battery)) {
 622                 sysfs_remove_battery(battery);
 623                 battery->update_time = 0;
 624                 return 0;
 625         }
 626         if (!battery->update_time ||
 627             old_present != acpi_battery_present(battery)) {
 628                 result = acpi_battery_get_info(battery);
 629                 if (result)
 630                         return result;
 631                 acpi_battery_init_alarm(battery);
 632         }
 633         if (!battery->bat.dev) {
 634                 result = sysfs_add_battery(battery);
 635                 if (result)
 636                         return result;
 637         }
 638         result = acpi_battery_get_state(battery);
 639         acpi_battery_quirks(battery);
 640         return result;
 641 }
 642
 643 static void acpi_battery_refresh(struct acpi_battery *battery)
 644 {
 645         if (!battery->bat.dev)
 646                 return;
 647
 648         acpi_battery_get_info(battery);
 649         /* The battery may have changed its reporting units. */
 650         sysfs_remove_battery(battery);
 651         sysfs_add_battery(battery);
 652 }
 653
 654 /* --------------------------------------------------------------------------
 655                               FS Interface (/proc)
 656    -------------------------------------------------------------------------- */
 657
 658 #ifdef CONFIG_ACPI_PROCFS_POWER
 659 static struct proc_dir_entry *acpi_battery_dir;
 660
 661 static int acpi_battery_print_info(struct seq_file *seq, int result)
 662 {
 663         struct acpi_battery *battery = seq->private;
 664
 665         if (result)
 666                 goto end;
 667
 668         seq_printf(seq, "present:                 %s\n",
 669                    acpi_battery_present(battery)?"yes":"no");
 670         if (!acpi_battery_present(battery))
 671                 goto end;
 672         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 673                 seq_printf(seq, "design capacity:         unknown\n");
 674         else
 675                 seq_printf(seq, "design capacity:         %d %sh\n",
 676                            battery->design_capacity,
 677                            acpi_battery_units(battery));
 678
 679         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 680                 seq_printf(seq, "last full capacity:      unknown\n");
 681         else
 682                 seq_printf(seq, "last full capacity:      %d %sh\n",
 683                            battery->full_charge_capacity,
 684                            acpi_battery_units(battery));
 685
 686         seq_printf(seq, "battery technology:      %srechargeable\n",
 687                    (!battery->technology)?"non-":"");
 688
 689         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 690                 seq_printf(seq, "design voltage:          unknown\n");
 691         else
 692                 seq_printf(seq, "design voltage:          %d mV\n",
 693                            battery->design_voltage);
 694         seq_printf(seq, "design capacity warning: %d %sh\n",
 695                    battery->design_capacity_warning,
 696                    acpi_battery_units(battery));
 697         seq_printf(seq, "design capacity low:     %d %sh\n",
 698                    battery->design_capacity_low,
 699                    acpi_battery_units(battery));
 700         seq_printf(seq, "cycle count:             %i\n", battery->cycle_count);
 701         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 702                    battery->capacity_granularity_1,
 703                    acpi_battery_units(battery));
 704         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 705                    battery->capacity_granularity_2,
 706                    acpi_battery_units(battery));
 707         seq_printf(seq, "model number:            %s\n", battery->model_number);
 708         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 709         seq_printf(seq, "battery type:            %s\n", battery->type);
 710         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 711       end:
 712         if (result)
 713                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 714         return result;
 715 }
 716
 717 static int acpi_battery_print_state(struct seq_file *seq, int result)
 718 {
 719         struct acpi_battery *battery = seq->private;
 720
 721         if (result)
 722                 goto end;
 723
 724         seq_printf(seq, "present:                 %s\n",
 725                    acpi_battery_present(battery)?"yes":"no");
 726         if (!acpi_battery_present(battery))
 727                 goto end;
 728
 729         seq_printf(seq, "capacity state:          %s\n",
 730                         (battery->state & 0x04)?"critical":"ok");
 731         if ((battery->state & 0x01) && (battery->state & 0x02))
 732                 seq_printf(seq,
 733                            "charging state:          charging/discharging\n");
 734         else if (battery->state & 0x01)
 735                 seq_printf(seq, "charging state:          discharging\n");
 736         else if (battery->state & 0x02)
 737                 seq_printf(seq, "charging state:          charging\n");
 738         else
 739                 seq_printf(seq, "charging state:          charged\n");
 740
 741         if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN)
 742                 seq_printf(seq, "present rate:            unknown\n");
 743         else
 744                 seq_printf(seq, "present rate:            %d %s\n",
 745                            battery->rate_now, acpi_battery_units(battery));
 746
 747         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 748                 seq_printf(seq, "remaining capacity:      unknown\n");
 749         else
 750                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 751                            battery->capacity_now, acpi_battery_units(battery));
 752         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 753                 seq_printf(seq, "present voltage:         unknown\n");
 754         else
 755                 seq_printf(seq, "present voltage:         %d mV\n",
 756                            battery->voltage_now);
 757       end:
 758         if (result)
 759                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 760
 761         return result;
 762 }
 763
 764 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 765 {
 766         struct acpi_battery *battery = seq->private;
 767
 768         if (result)
 769                 goto end;
 770
 771         if (!acpi_battery_present(battery)) {
 772                 seq_printf(seq, "present:                 no\n");
 773                 goto end;
 774         }
 775         seq_printf(seq, "alarm:                   ");
 776         if (!battery->alarm)
 777                 seq_printf(seq, "unsupported\n");
 778         else
 779                 seq_printf(seq, "%u %sh\n", battery->alarm,
 780                                 acpi_battery_units(battery));
 781       end:
 782         if (result)
 783                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 784         return result;
 785 }
 786
 787 static ssize_t acpi_battery_write_alarm(struct file *file,
 788                                         const char __user * buffer,
 789                                         size_t count, loff_t * ppos)
 790 {
 791         int result = 0;
 792         char alarm_string[12] = { '\0' };
 793         struct seq_file *m = file->private_data;
 794         struct acpi_battery *battery = m->private;
 795
 796         if (!battery || (count > sizeof(alarm_string) - 1))
 797                 return -EINVAL;
 798         if (!acpi_battery_present(battery)) {
 799                 result = -ENODEV;
 800                 goto end;
 801         }
 802         if (copy_from_user(alarm_string, buffer, count)) {
 803                 result = -EFAULT;
 804                 goto end;
 805         }
 806         alarm_string[count] = '\0';
 807         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 808         result = acpi_battery_set_alarm(battery);
 809       end:
 810         if (!result)
 811                 return count;
 812         return result;
 813 }
 814
 815 typedef int(*print_func)(struct seq_file *seq, int result);
 816
 817 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 818         acpi_battery_print_info,
 819         acpi_battery_print_state,
 820         acpi_battery_print_alarm,
 821 };
 822
 823 static int acpi_battery_read(int fid, struct seq_file *seq)
 824 {
 825         struct acpi_battery *battery = seq->private;
 826         int result = acpi_battery_update(battery);
 827         return acpi_print_funcs[fid](seq, result);
 828 }
 829
 830 #define DECLARE_FILE_FUNCTIONS(_name) \
 831 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 832 { \
 833         return acpi_battery_read(_name##_tag, seq); \
 834 } \
 835 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 836 { \
 837         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 838 }
 839
 840 DECLARE_FILE_FUNCTIONS(info);
 841 DECLARE_FILE_FUNCTIONS(state);
 842 DECLARE_FILE_FUNCTIONS(alarm);
 843
 844 #undef DECLARE_FILE_FUNCTIONS
 845
 846 #define FILE_DESCRIPTION_RO(_name) \
 847         { \
 848         .name = __stringify(_name), \
 849         .mode = S_IRUGO, \
 850         .ops = { \
 851                 .open = acpi_battery_##_name##_open_fs, \
 852                 .read = seq_read, \
 853                 .llseek = seq_lseek, \
 854                 .release = single_release, \
 855                 .owner = THIS_MODULE, \
 856                 }, \
 857         }
 858
 859 #define FILE_DESCRIPTION_RW(_name) \
 860         { \
 861         .name = __stringify(_name), \
 862         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 863         .ops = { \
 864                 .open = acpi_battery_##_name##_open_fs, \
 865                 .read = seq_read, \
 866                 .llseek = seq_lseek, \
 867                 .write = acpi_battery_write_##_name, \
 868                 .release = single_release, \
 869                 .owner = THIS_MODULE, \
 870                 }, \
 871         }
 872
 873 static const struct battery_file {
 874         struct file_operations ops;
 875         mode_t mode;
 876         const char *name;
 877 } acpi_battery_file[] = {
 878         FILE_DESCRIPTION_RO(info),
 879         FILE_DESCRIPTION_RO(state),
 880         FILE_DESCRIPTION_RW(alarm),
 881 };
 882
 883 #undef FILE_DESCRIPTION_RO
 884 #undef FILE_DESCRIPTION_RW
 885
 886 static int acpi_battery_add_fs(struct acpi_device *device)
 887 {
 888         struct proc_dir_entry *entry = NULL;
 889         int i;
 890
 891         printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded,"
 892                         " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n");
 893         if (!acpi_device_dir(device)) {
 894                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 895                                                      acpi_battery_dir);
 896                 if (!acpi_device_dir(device))
 897                         return -ENODEV;
 898         }
 899
 900         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 901                 entry = proc_create_data(acpi_battery_file[i].name,
 902                                          acpi_battery_file[i].mode,
 903                                          acpi_device_dir(device),
 904                                          &acpi_battery_file[i].ops,
 905                                          acpi_driver_data(device));
 906                 if (!entry)
 907                         return -ENODEV;
 908         }
 909         return 0;
 910 }
 911
 912 static void acpi_battery_remove_fs(struct acpi_device *device)
 913 {
 914         int i;
 915         if (!acpi_device_dir(device))
 916                 return;
 917         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 918                 remove_proc_entry(acpi_battery_file[i].name,
 919                                   acpi_device_dir(device));
 920
 921         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 922         acpi_device_dir(device) = NULL;
 923 }
 924
 925 #endif
 926
 927 /* --------------------------------------------------------------------------
 928                                  Driver Interface
 929    -------------------------------------------------------------------------- */
 930
 931 static void acpi_battery_notify(struct acpi_device *device, u32 event)
 932 {
 933         struct acpi_battery *battery = acpi_driver_data(device);
 934         struct device *old;
 935
 936         if (!battery)
 937                 return;
 938         old = battery->bat.dev;
 939         if (event == ACPI_BATTERY_NOTIFY_INFO)
 940                 acpi_battery_refresh(battery);
 941         acpi_battery_update(battery);
 942         acpi_bus_generate_proc_event(device, event,
 943                                      acpi_battery_present(battery));
 944         acpi_bus_generate_netlink_event(device->pnp.device_class,
 945                                         dev_name(&device->dev), event,
 946                                         acpi_battery_present(battery));
 947         /* acpi_battery_update could remove power_supply object */
 948         if (old && battery->bat.dev)
 949                 power_supply_changed(&battery->bat);
 950 }
 951
 952 static int battery_notify(struct notifier_block *nb,
 953                                unsigned long mode, void *_unused)
 954 {
 955         struct acpi_battery *battery = container_of(nb, struct acpi_battery,
 956                                                     pm_nb);
 957         switch (mode) {
 958         case PM_POST_HIBERNATION:
 959         case PM_POST_SUSPEND:
 960                 if (battery->bat.dev) {
 961                         sysfs_remove_battery(battery);
 962                         sysfs_add_battery(battery);
 963                 }
 964                 break;
 965         }
 966
 967         return 0;
 968 }
 969
 970 static int acpi_battery_add(struct acpi_device *device)
 971 {
 972         int result = 0;
 973         struct acpi_battery *battery = NULL;
 974         acpi_handle handle;
 975         if (!device)
 976                 return -EINVAL;
 977         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 978         if (!battery)
 979                 return -ENOMEM;
 980         battery->device = device;
 981         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 982         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 983         device->driver_data = battery;
 984         mutex_init(&battery->lock);
 985         if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle,
 986                         "_BIX", &handle)))
 987                 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags);
 988         result = acpi_battery_update(battery);
 989         if (result)
 990                 goto fail;
 991 #ifdef CONFIG_ACPI_PROCFS_POWER
 992         result = acpi_battery_add_fs(device);
 993 #endif
 994         if (result) {
 995 #ifdef CONFIG_ACPI_PROCFS_POWER
 996                 acpi_battery_remove_fs(device);
 997 #endif
 998                 goto fail;
 999         }
1000
1001         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
1002                 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
1003                 device->status.battery_present ? "present" : "absent");
1004
1005         battery->pm_nb.notifier_call = battery_notify;
1006         register_pm_notifier(&battery->pm_nb);
1007
1008         return result;
1009
1010 fail:
1011         sysfs_remove_battery(battery);
1012         mutex_destroy(&battery->lock);
1013         kfree(battery);
1014         return result;
1015 }
1016
1017 static int acpi_battery_remove(struct acpi_device *device, int type)
1018 {
1019         struct acpi_battery *battery = NULL;
1020
1021         if (!device || !acpi_driver_data(device))
1022                 return -EINVAL;
1023         battery = acpi_driver_data(device);
1024         unregister_pm_notifier(&battery->pm_nb);
1025 #ifdef CONFIG_ACPI_PROCFS_POWER
1026         acpi_battery_remove_fs(device);
1027 #endif
1028         sysfs_remove_battery(battery);
1029         mutex_destroy(&battery->lock);
1030         kfree(battery);
1031         return 0;
1032 }
1033
1034 /* this is needed to learn about changes made in suspended state */
1035 static int acpi_battery_resume(struct acpi_device *device)
1036 {
1037         struct acpi_battery *battery;
1038         if (!device)
1039                 return -EINVAL;
1040         battery = acpi_driver_data(device);
1041         battery->update_time = 0;
1042         acpi_battery_update(battery);
1043         return 0;
1044 }
1045
1046 static struct acpi_driver acpi_battery_driver = {
1047         .name = "battery",
1048         .class = ACPI_BATTERY_CLASS,
1049         .ids = battery_device_ids,
1050         .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
1051         .ops = {
1052                 .add = acpi_battery_add,
1053                 .resume = acpi_battery_resume,
1054                 .remove = acpi_battery_remove,
1055                 .notify = acpi_battery_notify,
1056                 },
1057 };
1058
1059 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
1060 {
1061         if (acpi_disabled)
1062                 return;
1063 #ifdef CONFIG_ACPI_PROCFS_POWER
1064         acpi_battery_dir = acpi_lock_battery_dir();
1065         if (!acpi_battery_dir)
1066                 return;
1067 #endif
1068         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
1069 #ifdef CONFIG_ACPI_PROCFS_POWER
1070                 acpi_unlock_battery_dir(acpi_battery_dir);
1071 #endif
1072                 return;
1073         }
1074         return;
1075 }
1076
1077 static int __init acpi_battery_init(void)
1078 {
1079         async_schedule(acpi_battery_init_async, NULL);
1080         return 0;
1081 }
1082
1083 static void __exit acpi_battery_exit(void)
1084 {
1085         acpi_bus_unregister_driver(&acpi_battery_driver);
1086 #ifdef CONFIG_ACPI_PROCFS_POWER
1087         acpi_unlock_battery_dir(acpi_battery_dir);
1088 #endif
1089 }
1090
1091 module_init(acpi_battery_init);
1092 module_exit(acpi_battery_exit);