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