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