drivers/acpi/battery.c

   1 /*
   2  *  acpi_battery.c - ACPI Battery Driver ($Revision: 37 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/seq_file.h>
  32 #include <asm/uaccess.h>
  33
  34 #include <acpi/acpi_bus.h>
  35 #include <acpi/acpi_drivers.h>
  36
  37 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  38
  39 #define ACPI_BATTERY_FORMAT_BIF "NNNNNNNNNSSSS"
  40 #define ACPI_BATTERY_FORMAT_BST "NNNN"
  41
  42 #define ACPI_BATTERY_COMPONENT          0x00040000
  43 #define ACPI_BATTERY_CLASS              "battery"
  44 #define ACPI_BATTERY_HID                "PNP0C0A"
  45 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  46 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  47 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  48 #define ACPI_BATTERY_UNITS_WATTS        "mW"
  49 #define ACPI_BATTERY_UNITS_AMPS         "mA"
  50
  51 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  52
  53 #define ACPI_BATTERY_UPDATE_TIME        0
  54
  55 #define ACPI_BATTERY_NONE_UPDATE        0
  56 #define ACPI_BATTERY_EASY_UPDATE        1
  57 #define ACPI_BATTERY_INIT_UPDATE        2
  58
  59 ACPI_MODULE_NAME("battery");
  60
  61 MODULE_AUTHOR("Paul Diefenbaugh");
  62 MODULE_DESCRIPTION("ACPI Battery Driver");
  63 MODULE_LICENSE("GPL");
  64
  65 static unsigned int update_time = ACPI_BATTERY_UPDATE_TIME;
  66
  67 /* 0 - every time, > 0 - by update_time */
  68 module_param(update_time, uint, 0644);
  69
  70 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  71 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  72
  73 static int acpi_battery_add(struct acpi_device *device);
  74 static int acpi_battery_remove(struct acpi_device *device, int type);
  75 static int acpi_battery_resume(struct acpi_device *device);
  76
  77 static struct acpi_driver acpi_battery_driver = {
  78         .name = "battery",
  79         .class = ACPI_BATTERY_CLASS,
  80         .ids = ACPI_BATTERY_HID,
  81         .ops = {
  82                 .add = acpi_battery_add,
  83                 .resume = acpi_battery_resume,
  84                 .remove = acpi_battery_remove,
  85                 },
  86 };
  87
  88 struct acpi_battery_state {
  89         acpi_integer state;
  90         acpi_integer present_rate;
  91         acpi_integer remaining_capacity;
  92         acpi_integer present_voltage;
  93 };
  94
  95 struct acpi_battery_info {
  96         acpi_integer power_unit;
  97         acpi_integer design_capacity;
  98         acpi_integer last_full_capacity;
  99         acpi_integer battery_technology;
 100         acpi_integer design_voltage;
 101         acpi_integer design_capacity_warning;
 102         acpi_integer design_capacity_low;
 103         acpi_integer battery_capacity_granularity_1;
 104         acpi_integer battery_capacity_granularity_2;
 105         acpi_string model_number;
 106         acpi_string serial_number;
 107         acpi_string battery_type;
 108         acpi_string oem_info;
 109 };
 110
 111 enum acpi_battery_files{
 112         ACPI_BATTERY_INFO = 0,
 113         ACPI_BATTERY_STATE,
 114         ACPI_BATTERY_ALARM,
 115         ACPI_BATTERY_NUMFILES,
 116 };
 117
 118 struct acpi_battery_flags {
 119         u8 battery_present_prev;
 120         u8 alarm_present;
 121         u8 init_update;
 122         u8 update[ACPI_BATTERY_NUMFILES];
 123         u8 power_unit;
 124 };
 125
 126 struct acpi_battery {
 127         struct mutex mutex;
 128         struct acpi_device *device;
 129         struct acpi_battery_flags flags;
 130         struct acpi_buffer bif_data;
 131         struct acpi_buffer bst_data;
 132         unsigned long alarm;
 133         unsigned long update_time[ACPI_BATTERY_NUMFILES];
 134 };
 135
 136 inline int acpi_battery_present(struct acpi_battery *battery)
 137 {
 138         return battery->device->status.battery_present;
 139 }
 140 inline char *acpi_battery_power_units(struct acpi_battery *battery)
 141 {
 142         if (battery->flags.power_unit)
 143                 return ACPI_BATTERY_UNITS_AMPS;
 144         else
 145                 return ACPI_BATTERY_UNITS_WATTS;
 146 }
 147
 148 inline acpi_handle acpi_battery_handle(struct acpi_battery *battery)
 149 {
 150         return battery->device->handle;
 151 }
 152
 153 /* --------------------------------------------------------------------------
 154                                Battery Management
 155    -------------------------------------------------------------------------- */
 156
 157 static void acpi_battery_check_result(struct acpi_battery *battery, int result)
 158 {
 159         if (!battery)
 160                 return;
 161
 162         if (result) {
 163                 battery->flags.init_update = 1;
 164         }
 165 }
 166
 167 static int acpi_battery_extract_package(struct acpi_battery *battery,
 168                                         union acpi_object *package,
 169                                         struct acpi_buffer *format,
 170                                         struct acpi_buffer *data,
 171                                         char *package_name)
 172 {
 173         acpi_status status = AE_OK;
 174         struct acpi_buffer data_null = { 0, NULL };
 175
 176         status = acpi_extract_package(package, format, &data_null);
 177         if (status != AE_BUFFER_OVERFLOW) {
 178                 ACPI_EXCEPTION((AE_INFO, status, "Extracting size %s",
 179                                 package_name));
 180                 return -ENODEV;
 181         }
 182
 183         if (data_null.length != data->length) {
 184                 kfree(data->pointer);
 185                 data->pointer = kzalloc(data_null.length, GFP_KERNEL);
 186                 if (!data->pointer) {
 187                         ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY, "kzalloc()"));
 188                         return -ENOMEM;
 189                 }
 190                 data->length = data_null.length;
 191         }
 192
 193         status = acpi_extract_package(package, format, data);
 194         if (ACPI_FAILURE(status)) {
 195                 ACPI_EXCEPTION((AE_INFO, status, "Extracting %s",
 196                                 package_name));
 197                 return -ENODEV;
 198         }
 199
 200         return 0;
 201 }
 202
 203 static int acpi_battery_get_status(struct acpi_battery *battery)
 204 {
 205         int result = 0;
 206
 207         result = acpi_bus_get_status(battery->device);
 208         if (result) {
 209                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 210                 return -ENODEV;
 211         }
 212         return result;
 213 }
 214
 215 static int acpi_battery_get_info(struct acpi_battery *battery)
 216 {
 217         int result = 0;
 218         acpi_status status = 0;
 219         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 220         struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BIF),
 221                 ACPI_BATTERY_FORMAT_BIF
 222         };
 223         union acpi_object *package = NULL;
 224         struct acpi_buffer *data = NULL;
 225         struct acpi_battery_info *bif = NULL;
 226
 227         battery->update_time[ACPI_BATTERY_INFO] = get_seconds();
 228
 229         if (!acpi_battery_present(battery))
 230                 return 0;
 231
 232         /* Evaluate _BIF */
 233
 234         status =
 235             acpi_evaluate_object(acpi_battery_handle(battery), "_BIF", NULL,
 236                                  &buffer);
 237         if (ACPI_FAILURE(status)) {
 238                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 239                 return -ENODEV;
 240         }
 241
 242         package = buffer.pointer;
 243
 244         data = &battery->bif_data;
 245
 246         /* Extract Package Data */
 247
 248         result =
 249             acpi_battery_extract_package(battery, package, &format, data,
 250                                          "_BIF");
 251         if (result)
 252                 goto end;
 253
 254       end:
 255
 256         kfree(buffer.pointer);
 257
 258         if (!result) {
 259                 bif = data->pointer;
 260                 battery->flags.power_unit = bif->power_unit;
 261         }
 262
 263         return result;
 264 }
 265
 266 static int acpi_battery_get_state(struct acpi_battery *battery)
 267 {
 268         int result = 0;
 269         acpi_status status = 0;
 270         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 271         struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BST),
 272                 ACPI_BATTERY_FORMAT_BST
 273         };
 274         union acpi_object *package = NULL;
 275         struct acpi_buffer *data = NULL;
 276
 277         battery->update_time[ACPI_BATTERY_STATE] = get_seconds();
 278
 279         if (!acpi_battery_present(battery))
 280                 return 0;
 281
 282         /* Evaluate _BST */
 283
 284         status =
 285             acpi_evaluate_object(acpi_battery_handle(battery), "_BST", NULL,
 286                                  &buffer);
 287         if (ACPI_FAILURE(status)) {
 288                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 289                 return -ENODEV;
 290         }
 291
 292         package = buffer.pointer;
 293
 294         data = &battery->bst_data;
 295
 296         /* Extract Package Data */
 297
 298         result =
 299             acpi_battery_extract_package(battery, package, &format, data,
 300                                          "_BST");
 301         if (result)
 302                 goto end;
 303
 304       end:
 305         kfree(buffer.pointer);
 306
 307         return result;
 308 }
 309
 310 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 311 {
 312         battery->update_time[ACPI_BATTERY_ALARM] = get_seconds();
 313
 314         return 0;
 315 }
 316
 317 static int acpi_battery_set_alarm(struct acpi_battery *battery,
 318                                   unsigned long alarm)
 319 {
 320         acpi_status status = 0;
 321         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 322         struct acpi_object_list arg_list = { 1, &arg0 };
 323
 324         battery->update_time[ACPI_BATTERY_ALARM] = get_seconds();
 325
 326         if (!acpi_battery_present(battery))
 327                 return -ENODEV;
 328
 329         if (!battery->flags.alarm_present)
 330                 return -ENODEV;
 331
 332         arg0.integer.value = alarm;
 333
 334         status =
 335             acpi_evaluate_object(acpi_battery_handle(battery), "_BTP",
 336                                  &arg_list, NULL);
 337         if (ACPI_FAILURE(status))
 338                 return -ENODEV;
 339
 340         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", (u32) alarm));
 341
 342         battery->alarm = alarm;
 343
 344         return 0;
 345 }
 346
 347 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 348 {
 349         int result = 0;
 350         acpi_status status = AE_OK;
 351         acpi_handle handle = NULL;
 352         struct acpi_battery_info *bif = battery->bif_data.pointer;
 353         unsigned long alarm = battery->alarm;
 354
 355         /* See if alarms are supported, and if so, set default */
 356
 357         status = acpi_get_handle(acpi_battery_handle(battery), "_BTP", &handle);
 358         if (ACPI_SUCCESS(status)) {
 359                 battery->flags.alarm_present = 1;
 360                 if (!alarm && bif) {
 361                         alarm = bif->design_capacity_warning;
 362                 }
 363                 result = acpi_battery_set_alarm(battery, alarm);
 364                 if (result)
 365                         goto end;
 366         } else {
 367                 battery->flags.alarm_present = 0;
 368         }
 369
 370       end:
 371
 372         return result;
 373 }
 374
 375 static int acpi_battery_init_update(struct acpi_battery *battery)
 376 {
 377         int result = 0;
 378
 379         result = acpi_battery_get_status(battery);
 380         if (result)
 381                 return result;
 382
 383         battery->flags.battery_present_prev = acpi_battery_present(battery);
 384
 385         if (acpi_battery_present(battery)) {
 386                 result = acpi_battery_get_info(battery);
 387                 if (result)
 388                         return result;
 389                 result = acpi_battery_get_state(battery);
 390                 if (result)
 391                         return result;
 392
 393                 acpi_battery_init_alarm(battery);
 394         }
 395
 396         return result;
 397 }
 398
 399 static int acpi_battery_update(struct acpi_battery *battery,
 400                                int update, int *update_result_ptr)
 401 {
 402         int result = 0;
 403         int update_result = ACPI_BATTERY_NONE_UPDATE;
 404
 405         if (!acpi_battery_present(battery)) {
 406                 update = 1;
 407         }
 408
 409         if (battery->flags.init_update) {
 410                 result = acpi_battery_init_update(battery);
 411                 if (result)
 412                         goto end;
 413                 update_result = ACPI_BATTERY_INIT_UPDATE;
 414         } else if (update) {
 415                 result = acpi_battery_get_status(battery);
 416                 if (result)
 417                         goto end;
 418                 if ((!battery->flags.battery_present_prev & acpi_battery_present(battery))
 419                     || (battery->flags.battery_present_prev & !acpi_battery_present(battery))) {
 420                         result = acpi_battery_init_update(battery);
 421                         if (result)
 422                                 goto end;
 423                         update_result = ACPI_BATTERY_INIT_UPDATE;
 424                 } else {
 425                         update_result = ACPI_BATTERY_EASY_UPDATE;
 426                 }
 427         }
 428
 429       end:
 430
 431         battery->flags.init_update = (result != 0);
 432
 433         *update_result_ptr = update_result;
 434
 435         return result;
 436 }
 437
 438 static void acpi_battery_notify_update(struct acpi_battery *battery)
 439 {
 440         acpi_battery_get_status(battery);
 441
 442         if (battery->flags.init_update) {
 443                 return;
 444         }
 445
 446         if ((!battery->flags.battery_present_prev &
 447              acpi_battery_present(battery)) ||
 448             (battery->flags.battery_present_prev &
 449              !acpi_battery_present(battery))) {
 450                 battery->flags.init_update = 1;
 451         } else {
 452                 battery->flags.update[ACPI_BATTERY_INFO] = 1;
 453                 battery->flags.update[ACPI_BATTERY_STATE] = 1;
 454                 battery->flags.update[ACPI_BATTERY_ALARM] = 1;
 455         }
 456 }
 457
 458 /* --------------------------------------------------------------------------
 459                               FS Interface (/proc)
 460    -------------------------------------------------------------------------- */
 461
 462 static struct proc_dir_entry *acpi_battery_dir;
 463
 464 static int acpi_battery_print_info(struct seq_file *seq, int result)
 465 {
 466         struct acpi_battery *battery = seq->private;
 467         struct acpi_battery_info *bif = NULL;
 468         char *units = "?";
 469
 470         if (result)
 471                 goto end;
 472
 473         if (acpi_battery_present(battery))
 474                 seq_printf(seq, "present:                 yes\n");
 475         else {
 476                 seq_printf(seq, "present:                 no\n");
 477                 goto end;
 478         }
 479
 480         bif = battery->bif_data.pointer;
 481         if (!bif) {
 482                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "BIF buffer is NULL"));
 483                 result = -ENODEV;
 484                 goto end;
 485         }
 486
 487         /* Battery Units */
 488
 489         units = acpi_battery_power_units(battery);
 490
 491         if (bif->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 492                 seq_printf(seq, "design capacity:         unknown\n");
 493         else
 494                 seq_printf(seq, "design capacity:         %d %sh\n",
 495                            (u32) bif->design_capacity, units);
 496
 497         if (bif->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 498                 seq_printf(seq, "last full capacity:      unknown\n");
 499         else
 500                 seq_printf(seq, "last full capacity:      %d %sh\n",
 501                            (u32) bif->last_full_capacity, units);
 502
 503         switch ((u32) bif->battery_technology) {
 504         case 0:
 505                 seq_printf(seq, "battery technology:      non-rechargeable\n");
 506                 break;
 507         case 1:
 508                 seq_printf(seq, "battery technology:      rechargeable\n");
 509                 break;
 510         default:
 511                 seq_printf(seq, "battery technology:      unknown\n");
 512                 break;
 513         }
 514
 515         if (bif->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 516                 seq_printf(seq, "design voltage:          unknown\n");
 517         else
 518                 seq_printf(seq, "design voltage:          %d mV\n",
 519                            (u32) bif->design_voltage);
 520         seq_printf(seq, "design capacity warning: %d %sh\n",
 521                    (u32) bif->design_capacity_warning, units);
 522         seq_printf(seq, "design capacity low:     %d %sh\n",
 523                    (u32) bif->design_capacity_low, units);
 524         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 525                    (u32) bif->battery_capacity_granularity_1, units);
 526         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 527                    (u32) bif->battery_capacity_granularity_2, units);
 528         seq_printf(seq, "model number:            %s\n", bif->model_number);
 529         seq_printf(seq, "serial number:           %s\n", bif->serial_number);
 530         seq_printf(seq, "battery type:            %s\n", bif->battery_type);
 531         seq_printf(seq, "OEM info:                %s\n", bif->oem_info);
 532
 533       end:
 534
 535         if (result)
 536                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 537
 538         return result;
 539 }
 540
 541 static int acpi_battery_print_state(struct seq_file *seq, int result)
 542 {
 543         struct acpi_battery *battery = seq->private;
 544         struct acpi_battery_state *bst = NULL;
 545         char *units = "?";
 546
 547         if (result)
 548                 goto end;
 549
 550         if (acpi_battery_present(battery))
 551                 seq_printf(seq, "present:                 yes\n");
 552         else {
 553                 seq_printf(seq, "present:                 no\n");
 554                 goto end;
 555         }
 556
 557         bst = battery->bst_data.pointer;
 558         if (!bst) {
 559                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "BST buffer is NULL"));
 560                 result = -ENODEV;
 561                 goto end;
 562         }
 563
 564         /* Battery Units */
 565
 566         units = acpi_battery_power_units(battery);
 567
 568         if (!(bst->state & 0x04))
 569                 seq_printf(seq, "capacity state:          ok\n");
 570         else
 571                 seq_printf(seq, "capacity state:          critical\n");
 572
 573         if ((bst->state & 0x01) && (bst->state & 0x02)) {
 574                 seq_printf(seq,
 575                            "charging state:          charging/discharging\n");
 576         } else if (bst->state & 0x01)
 577                 seq_printf(seq, "charging state:          discharging\n");
 578         else if (bst->state & 0x02)
 579                 seq_printf(seq, "charging state:          charging\n");
 580         else {
 581                 seq_printf(seq, "charging state:          charged\n");
 582         }
 583
 584         if (bst->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
 585                 seq_printf(seq, "present rate:            unknown\n");
 586         else
 587                 seq_printf(seq, "present rate:            %d %s\n",
 588                            (u32) bst->present_rate, units);
 589
 590         if (bst->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 591                 seq_printf(seq, "remaining capacity:      unknown\n");
 592         else
 593                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 594                            (u32) bst->remaining_capacity, units);
 595
 596         if (bst->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 597                 seq_printf(seq, "present voltage:         unknown\n");
 598         else
 599                 seq_printf(seq, "present voltage:         %d mV\n",
 600                            (u32) bst->present_voltage);
 601
 602       end:
 603
 604         if (result) {
 605                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 606         }
 607
 608         return result;
 609 }
 610
 611 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 612 {
 613         struct acpi_battery *battery = seq->private;
 614         char *units = "?";
 615
 616         if (result)
 617                 goto end;
 618
 619         if (!acpi_battery_present(battery)) {
 620                 seq_printf(seq, "present:                 no\n");
 621                 goto end;
 622         }
 623
 624         /* Battery Units */
 625
 626         units = acpi_battery_power_units(battery);
 627
 628         seq_printf(seq, "alarm:                   ");
 629         if (!battery->alarm)
 630                 seq_printf(seq, "unsupported\n");
 631         else
 632                 seq_printf(seq, "%lu %sh\n", battery->alarm, units);
 633
 634       end:
 635
 636         if (result)
 637                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 638
 639         return result;
 640 }
 641
 642 static ssize_t
 643 acpi_battery_write_alarm(struct file *file,
 644                          const char __user * buffer,
 645                          size_t count, loff_t * ppos)
 646 {
 647         int result = 0;
 648         char alarm_string[12] = { '\0' };
 649         struct seq_file *m = file->private_data;
 650         struct acpi_battery *battery = m->private;
 651         int update_result = ACPI_BATTERY_NONE_UPDATE;
 652
 653         if (!battery || (count > sizeof(alarm_string) - 1))
 654                 return -EINVAL;
 655
 656         mutex_lock(&battery->mutex);
 657
 658         result = acpi_battery_update(battery, 1, &update_result);
 659         if (result) {
 660                 result = -ENODEV;
 661                 goto end;
 662         }
 663
 664         if (!acpi_battery_present(battery)) {
 665                 result = -ENODEV;
 666                 goto end;
 667         }
 668
 669         if (copy_from_user(alarm_string, buffer, count)) {
 670                 result = -EFAULT;
 671                 goto end;
 672         }
 673
 674         alarm_string[count] = '\0';
 675
 676         result = acpi_battery_set_alarm(battery,
 677                                         simple_strtoul(alarm_string, NULL, 0));
 678         if (result)
 679                 goto end;
 680
 681       end:
 682
 683         acpi_battery_check_result(battery, result);
 684
 685         if (!result)
 686                 result = count;
 687
 688         mutex_unlock(&battery->mutex);
 689
 690         return result;
 691 }
 692
 693 typedef int(*print_func)(struct seq_file *seq, int result);
 694 typedef int(*get_func)(struct acpi_battery *battery);
 695
 696 static struct acpi_read_mux {
 697         print_func print;
 698         get_func get;
 699 } acpi_read_funcs[ACPI_BATTERY_NUMFILES] = {
 700         {.get = acpi_battery_get_info, .print = acpi_battery_print_info},
 701         {.get = acpi_battery_get_state, .print = acpi_battery_print_state},
 702         {.get = acpi_battery_get_alarm, .print = acpi_battery_print_alarm},
 703 };
 704
 705 static int acpi_battery_read(int fid, struct seq_file *seq)
 706 {
 707         struct acpi_battery *battery = seq->private;
 708         int result = 0;
 709         int update_result = ACPI_BATTERY_NONE_UPDATE;
 710         int update = 0;
 711
 712         mutex_lock(&battery->mutex);
 713
 714         update = (get_seconds() - battery->update_time[fid] >= update_time);
 715         update = (update | battery->flags.update[fid]);
 716
 717         result = acpi_battery_update(battery, update, &update_result);
 718         if (result)
 719                 goto end;
 720
 721         if (update_result == ACPI_BATTERY_EASY_UPDATE) {
 722                 result = acpi_read_funcs[fid].get(battery);
 723                 if (result)
 724                         goto end;
 725         }
 726
 727       end:
 728         result = acpi_read_funcs[fid].print(seq, result);
 729         acpi_battery_check_result(battery, result);
 730         battery->flags.update[fid] = result;
 731         mutex_unlock(&battery->mutex);
 732         return result;
 733 }
 734
 735 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 736 {
 737         return acpi_battery_read(ACPI_BATTERY_INFO, seq);
 738 }
 739
 740 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 741 {
 742         return acpi_battery_read(ACPI_BATTERY_STATE, seq);
 743 }
 744
 745 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 746 {
 747         return acpi_battery_read(ACPI_BATTERY_ALARM, seq);
 748 }
 749
 750 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 751 {
 752         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 753 }
 754
 755 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 756 {
 757         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 758 }
 759
 760 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 761 {
 762         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 763 }
 764
 765 static struct battery_file {
 766         struct file_operations ops;
 767         mode_t mode;
 768         char *name;
 769 } acpi_battery_file[] = {
 770         {
 771         .name = "info",
 772         .mode = S_IRUGO,
 773         .ops = {
 774         .open = acpi_battery_info_open_fs,
 775         .read = seq_read,
 776         .llseek = seq_lseek,
 777         .release = single_release,
 778         .owner = THIS_MODULE,
 779         },
 780         },
 781         {
 782         .name = "state",
 783         .mode = S_IRUGO,
 784         .ops = {
 785         .open = acpi_battery_state_open_fs,
 786         .read = seq_read,
 787         .llseek = seq_lseek,
 788         .release = single_release,
 789         .owner = THIS_MODULE,
 790         },
 791         },
 792         {
 793         .name = "alarm",
 794         .mode = S_IFREG | S_IRUGO | S_IWUSR,
 795         .ops = {
 796         .open = acpi_battery_alarm_open_fs,
 797         .read = seq_read,
 798         .write = acpi_battery_write_alarm,
 799         .llseek = seq_lseek,
 800         .release = single_release,
 801         .owner = THIS_MODULE,
 802         },
 803         },
 804 };
 805
 806 static int acpi_battery_add_fs(struct acpi_device *device)
 807 {
 808         struct proc_dir_entry *entry = NULL;
 809         int i;
 810
 811         if (!acpi_device_dir(device)) {
 812                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 813                                                      acpi_battery_dir);
 814                 if (!acpi_device_dir(device))
 815                         return -ENODEV;
 816                 acpi_device_dir(device)->owner = THIS_MODULE;
 817         }
 818
 819         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 820                 entry = create_proc_entry(acpi_battery_file[i].name,
 821                                   acpi_battery_file[i].mode, acpi_device_dir(device));
 822                 if (!entry)
 823                         return -ENODEV;
 824                 else {
 825                         entry->proc_fops = &acpi_battery_file[i].ops;
 826                         entry->data = acpi_driver_data(device);
 827                         entry->owner = THIS_MODULE;
 828                 }
 829         }
 830
 831         return 0;
 832 }
 833
 834 static int acpi_battery_remove_fs(struct acpi_device *device)
 835 {
 836         int i;
 837         if (acpi_device_dir(device)) {
 838                 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 839                         remove_proc_entry(acpi_battery_file[i].name,
 840                                   acpi_device_dir(device));
 841                 }
 842                 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 843                 acpi_device_dir(device) = NULL;
 844         }
 845
 846         return 0;
 847 }
 848
 849 /* --------------------------------------------------------------------------
 850                                  Driver Interface
 851    -------------------------------------------------------------------------- */
 852
 853 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
 854 {
 855         struct acpi_battery *battery = data;
 856         struct acpi_device *device = NULL;
 857
 858         if (!battery)
 859                 return;
 860
 861         device = battery->device;
 862
 863         switch (event) {
 864         case ACPI_BATTERY_NOTIFY_STATUS:
 865         case ACPI_BATTERY_NOTIFY_INFO:
 866         case ACPI_NOTIFY_BUS_CHECK:
 867         case ACPI_NOTIFY_DEVICE_CHECK:
 868                 device = battery->device;
 869                 acpi_battery_notify_update(battery);
 870                 acpi_bus_generate_event(device, event,
 871                                         acpi_battery_present(battery));
 872                 break;
 873         default:
 874                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 875                                   "Unsupported event [0x%x]\n", event));
 876                 break;
 877         }
 878
 879         return;
 880 }
 881
 882 static int acpi_battery_add(struct acpi_device *device)
 883 {
 884         int result = 0;
 885         acpi_status status = 0;
 886         struct acpi_battery *battery = NULL;
 887
 888         if (!device)
 889                 return -EINVAL;
 890
 891         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 892         if (!battery)
 893                 return -ENOMEM;
 894
 895         mutex_init(&battery->mutex);
 896
 897         mutex_lock(&battery->mutex);
 898
 899         battery->device = device;
 900         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 901         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 902         acpi_driver_data(device) = battery;
 903
 904         result = acpi_battery_get_status(battery);
 905         if (result)
 906                 goto end;
 907
 908         battery->flags.init_update = 1;
 909
 910         result = acpi_battery_add_fs(device);
 911         if (result)
 912                 goto end;
 913
 914         status = acpi_install_notify_handler(device->handle,
 915                                              ACPI_ALL_NOTIFY,
 916                                              acpi_battery_notify, battery);
 917         if (ACPI_FAILURE(status)) {
 918                 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
 919                 result = -ENODEV;
 920                 goto end;
 921         }
 922
 923         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 924                ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 925                device->status.battery_present ? "present" : "absent");
 926
 927       end:
 928
 929         if (result) {
 930                 acpi_battery_remove_fs(device);
 931                 kfree(battery);
 932         }
 933
 934         mutex_unlock(&battery->mutex);
 935
 936         return result;
 937 }
 938
 939 static int acpi_battery_remove(struct acpi_device *device, int type)
 940 {
 941         acpi_status status = 0;
 942         struct acpi_battery *battery = NULL;
 943
 944         if (!device || !acpi_driver_data(device))
 945                 return -EINVAL;
 946
 947         battery = acpi_driver_data(device);
 948
 949         mutex_lock(&battery->mutex);
 950
 951         status = acpi_remove_notify_handler(device->handle,
 952                                             ACPI_ALL_NOTIFY,
 953                                             acpi_battery_notify);
 954
 955         acpi_battery_remove_fs(device);
 956
 957         kfree(battery->bif_data.pointer);
 958
 959         kfree(battery->bst_data.pointer);
 960
 961         mutex_unlock(&battery->mutex);
 962
 963         mutex_destroy(&battery->mutex);
 964
 965         kfree(battery);
 966
 967         return 0;
 968 }
 969
 970 /* this is needed to learn about changes made in suspended state */
 971 static int acpi_battery_resume(struct acpi_device *device)
 972 {
 973         struct acpi_battery *battery;
 974
 975         if (!device)
 976                 return -EINVAL;
 977
 978         battery = device->driver_data;
 979
 980         battery->flags.init_update = 1;
 981
 982         return 0;
 983 }
 984
 985 static int __init acpi_battery_init(void)
 986 {
 987         int result;
 988
 989         if (acpi_disabled)
 990                 return -ENODEV;
 991
 992         acpi_battery_dir = acpi_lock_battery_dir();
 993         if (!acpi_battery_dir)
 994                 return -ENODEV;
 995
 996         result = acpi_bus_register_driver(&acpi_battery_driver);
 997         if (result < 0) {
 998                 acpi_unlock_battery_dir(acpi_battery_dir);
 999                 return -ENODEV;
1000         }
1001
1002         return 0;
1003 }
1004
1005 static void __exit acpi_battery_exit(void)
1006 {
1007         acpi_bus_unregister_driver(&acpi_battery_driver);
1008
1009         acpi_unlock_battery_dir(acpi_battery_dir);
1010
1011         return;
1012 }
1013
1014 module_init(acpi_battery_init);
1015 module_exit(acpi_battery_exit);