err.no Git - linux-2.6/blob - 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_COMPONENT          0x00040000
  40 #define ACPI_BATTERY_CLASS              "battery"
  41 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  42 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  43 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  44 #define ACPI_BATTERY_UNITS_WATTS        "mW"
  45 #define ACPI_BATTERY_UNITS_AMPS         "mA"
  46
  47 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  48
  49 #define ACPI_BATTERY_UPDATE_TIME        0
  50
  51 #define ACPI_BATTERY_NONE_UPDATE        0
  52 #define ACPI_BATTERY_EASY_UPDATE        1
  53 #define ACPI_BATTERY_INIT_UPDATE        2
  54
  55 ACPI_MODULE_NAME("battery");
  56
  57 MODULE_AUTHOR("Paul Diefenbaugh");
  58 MODULE_DESCRIPTION("ACPI Battery Driver");
  59 MODULE_LICENSE("GPL");
  60
  61 static unsigned int update_time = ACPI_BATTERY_UPDATE_TIME;
  62
  63 /* 0 - every time, > 0 - by update_time */
  64 module_param(update_time, uint, 0644);
  65
  66 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  67 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  68
  69 static int acpi_battery_add(struct acpi_device *device);
  70 static int acpi_battery_remove(struct acpi_device *device, int type);
  71 static int acpi_battery_resume(struct acpi_device *device);
  72
  73 static const struct acpi_device_id battery_device_ids[] = {
  74         {"PNP0C0A", 0},
  75         {"", 0},
  76 };
  77 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  78
  79 static struct acpi_driver acpi_battery_driver = {
  80         .name = "battery",
  81         .class = ACPI_BATTERY_CLASS,
  82         .ids = battery_device_ids,
  83         .ops = {
  84                 .add = acpi_battery_add,
  85                 .resume = acpi_battery_resume,
  86                 .remove = acpi_battery_remove,
  87                 },
  88 };
  89
  90 enum acpi_battery_files {
  91         ACPI_BATTERY_INFO = 0,
  92         ACPI_BATTERY_STATE,
  93         ACPI_BATTERY_ALARM,
  94         ACPI_BATTERY_NUMFILES,
  95 };
  96
  97 struct acpi_battery {
  98         struct acpi_device *device;
  99         struct mutex lock;
 100         unsigned long alarm;
 101         unsigned long update_time[ACPI_BATTERY_NUMFILES];
 102         int state;
 103         int present_rate;
 104         int remaining_capacity;
 105         int present_voltage;
 106         int power_unit;
 107         int design_capacity;
 108         int last_full_capacity;
 109         int technology;
 110         int design_voltage;
 111         int design_capacity_warning;
 112         int design_capacity_low;
 113         int capacity_granularity_1;
 114         int capacity_granularity_2;
 115         char model_number[32];
 116         char serial_number[32];
 117         char type[32];
 118         char oem_info[32];
 119         u8 present_prev;
 120         u8 alarm_present;
 121         u8 init_update;
 122         u8 update[ACPI_BATTERY_NUMFILES];
 123 };
 124
 125 inline int acpi_battery_present(struct acpi_battery *battery)
 126 {
 127         return battery->device->status.battery_present;
 128 }
 129
 130 inline char *acpi_battery_power_units(struct acpi_battery *battery)
 131 {
 132         if (battery->power_unit)
 133                 return ACPI_BATTERY_UNITS_AMPS;
 134         else
 135                 return ACPI_BATTERY_UNITS_WATTS;
 136 }
 137
 138 inline acpi_handle acpi_battery_handle(struct acpi_battery *battery)
 139 {
 140         return battery->device->handle;
 141 }
 142
 143 /* --------------------------------------------------------------------------
 144                                Battery Management
 145    -------------------------------------------------------------------------- */
 146
 147 static void acpi_battery_check_result(struct acpi_battery *battery, int result)
 148 {
 149         if (!battery)
 150                 return;
 151
 152         if (result) {
 153                 battery->init_update = 1;
 154         }
 155 }
 156
 157 struct acpi_offsets {
 158         size_t offset;          /* offset inside struct acpi_sbs_battery */
 159         u8 mode;                /* int or string? */
 160 };
 161
 162 static struct acpi_offsets state_offsets[] = {
 163         {offsetof(struct acpi_battery, state), 0},
 164         {offsetof(struct acpi_battery, present_rate), 0},
 165         {offsetof(struct acpi_battery, remaining_capacity), 0},
 166         {offsetof(struct acpi_battery, present_voltage), 0},
 167 };
 168
 169 static struct acpi_offsets info_offsets[] = {
 170         {offsetof(struct acpi_battery, power_unit), 0},
 171         {offsetof(struct acpi_battery, design_capacity), 0},
 172         {offsetof(struct acpi_battery, last_full_capacity), 0},
 173         {offsetof(struct acpi_battery, technology), 0},
 174         {offsetof(struct acpi_battery, design_voltage), 0},
 175         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 176         {offsetof(struct acpi_battery, design_capacity_low), 0},
 177         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 178         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 179         {offsetof(struct acpi_battery, model_number), 1},
 180         {offsetof(struct acpi_battery, serial_number), 1},
 181         {offsetof(struct acpi_battery, type), 1},
 182         {offsetof(struct acpi_battery, oem_info), 1},
 183 };
 184
 185 static int extract_package(struct acpi_battery *battery,
 186                            union acpi_object *package,
 187                            struct acpi_offsets *offsets, int num)
 188 {
 189         int i, *x;
 190         union acpi_object *element;
 191         if (package->type != ACPI_TYPE_PACKAGE)
 192                 return -EFAULT;
 193         for (i = 0; i < num; ++i) {
 194                 if (package->package.count <= i)
 195                         return -EFAULT;
 196                 element = &package->package.elements[i];
 197                 if (offsets[i].mode) {
 198                         if (element->type != ACPI_TYPE_STRING &&
 199                             element->type != ACPI_TYPE_BUFFER)
 200                                 return -EFAULT;
 201                         strncpy((u8 *)battery + offsets[i].offset,
 202                                 element->string.pointer, 32);
 203                 } else {
 204                         if (element->type != ACPI_TYPE_INTEGER)
 205                                 return -EFAULT;
 206                         x = (int *)((u8 *)battery + offsets[i].offset);
 207                         *x = element->integer.value;
 208                 }
 209         }
 210         return 0;
 211 }
 212
 213 static int acpi_battery_get_status(struct acpi_battery *battery)
 214 {
 215         int result = 0;
 216
 217         result = acpi_bus_get_status(battery->device);
 218         if (result) {
 219                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 220                 return -ENODEV;
 221         }
 222         return result;
 223 }
 224
 225 static int acpi_battery_get_info(struct acpi_battery *battery)
 226 {
 227         int result = 0;
 228         acpi_status status = 0;
 229         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 230
 231         battery->update_time[ACPI_BATTERY_INFO] = get_seconds();
 232         if (!acpi_battery_present(battery))
 233                 return 0;
 234         mutex_lock(&battery->lock);
 235         status = acpi_evaluate_object(acpi_battery_handle(battery), "_BIF",
 236                                       NULL, &buffer);
 237         mutex_unlock(&battery->lock);
 238         if (ACPI_FAILURE(status)) {
 239                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 240                 return -ENODEV;
 241         }
 242         result = extract_package(battery, buffer.pointer,
 243                                  info_offsets, ARRAY_SIZE(info_offsets));
 244         kfree(buffer.pointer);
 245         return result;
 246 }
 247
 248 static int acpi_battery_get_state(struct acpi_battery *battery)
 249 {
 250         int result = 0;
 251         acpi_status status = 0;
 252         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 253
 254         battery->update_time[ACPI_BATTERY_STATE] = get_seconds();
 255
 256         if (!acpi_battery_present(battery))
 257                 return 0;
 258
 259         mutex_lock(&battery->lock);
 260         status = acpi_evaluate_object(acpi_battery_handle(battery), "_BST",
 261                                       NULL, &buffer);
 262         mutex_unlock(&battery->lock);
 263
 264         if (ACPI_FAILURE(status)) {
 265                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 266                 return -ENODEV;
 267         }
 268         result = extract_package(battery, buffer.pointer,
 269                                  state_offsets, ARRAY_SIZE(state_offsets));
 270         kfree(buffer.pointer);
 271         return result;
 272 }
 273
 274 static int acpi_battery_get_alarm(struct acpi_battery *battery)
 275 {
 276         battery->update_time[ACPI_BATTERY_ALARM] = get_seconds();
 277
 278         return 0;
 279 }
 280
 281 static int acpi_battery_set_alarm(struct acpi_battery *battery,
 282                                   unsigned long alarm)
 283 {
 284         acpi_status status = 0;
 285         union acpi_object arg0 = { ACPI_TYPE_INTEGER };
 286         struct acpi_object_list arg_list = { 1, &arg0 };
 287
 288         battery->update_time[ACPI_BATTERY_ALARM] = get_seconds();
 289
 290         if (!acpi_battery_present(battery))
 291                 return -ENODEV;
 292
 293         if (!battery->alarm_present)
 294                 return -ENODEV;
 295
 296         arg0.integer.value = alarm;
 297
 298         mutex_lock(&battery->lock);
 299         status = acpi_evaluate_object(acpi_battery_handle(battery), "_BTP",
 300                                       &arg_list, NULL);
 301         mutex_unlock(&battery->lock);
 302         if (ACPI_FAILURE(status))
 303                 return -ENODEV;
 304
 305         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", (u32) alarm));
 306
 307         battery->alarm = alarm;
 308
 309         return 0;
 310 }
 311
 312 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 313 {
 314         int result = 0;
 315         acpi_status status = AE_OK;
 316         acpi_handle handle = NULL;
 317         unsigned long alarm = battery->alarm;
 318
 319         /* See if alarms are supported, and if so, set default */
 320
 321         status = acpi_get_handle(acpi_battery_handle(battery), "_BTP", &handle);
 322         if (ACPI_SUCCESS(status)) {
 323                 battery->alarm_present = 1;
 324                 if (!alarm) {
 325                         alarm = battery->design_capacity_warning;
 326                 }
 327                 result = acpi_battery_set_alarm(battery, alarm);
 328                 if (result)
 329                         goto end;
 330         } else {
 331                 battery->alarm_present = 0;
 332         }
 333
 334       end:
 335
 336         return result;
 337 }
 338
 339 static int acpi_battery_init_update(struct acpi_battery *battery)
 340 {
 341         int result = 0;
 342
 343         result = acpi_battery_get_status(battery);
 344         if (result)
 345                 return result;
 346
 347         battery->present_prev = acpi_battery_present(battery);
 348
 349         if (acpi_battery_present(battery)) {
 350                 result = acpi_battery_get_info(battery);
 351                 if (result)
 352                         return result;
 353                 result = acpi_battery_get_state(battery);
 354                 if (result)
 355                         return result;
 356
 357                 acpi_battery_init_alarm(battery);
 358         }
 359
 360         return result;
 361 }
 362
 363 static int acpi_battery_update(struct acpi_battery *battery,
 364                                int update, int *update_result_ptr)
 365 {
 366         int result = 0;
 367         int update_result = ACPI_BATTERY_NONE_UPDATE;
 368
 369         if (!acpi_battery_present(battery)) {
 370                 update = 1;
 371         }
 372
 373         if (battery->init_update) {
 374                 result = acpi_battery_init_update(battery);
 375                 if (result)
 376                         goto end;
 377                 update_result = ACPI_BATTERY_INIT_UPDATE;
 378         } else if (update) {
 379                 result = acpi_battery_get_status(battery);
 380                 if (result)
 381                         goto end;
 382                 if ((!battery->present_prev & acpi_battery_present(battery))
 383                     || (battery->present_prev & !acpi_battery_present(battery))) {
 384                         result = acpi_battery_init_update(battery);
 385                         if (result)
 386                                 goto end;
 387                         update_result = ACPI_BATTERY_INIT_UPDATE;
 388                 } else {
 389                         update_result = ACPI_BATTERY_EASY_UPDATE;
 390                 }
 391         }
 392
 393       end:
 394
 395         battery->init_update = (result != 0);
 396
 397         *update_result_ptr = update_result;
 398
 399         return result;
 400 }
 401
 402 static void acpi_battery_notify_update(struct acpi_battery *battery)
 403 {
 404         acpi_battery_get_status(battery);
 405
 406         if (battery->init_update) {
 407                 return;
 408         }
 409
 410         if ((!battery->present_prev &
 411              acpi_battery_present(battery)) ||
 412             (battery->present_prev &
 413              !acpi_battery_present(battery))) {
 414                 battery->init_update = 1;
 415         } else {
 416                 battery->update[ACPI_BATTERY_INFO] = 1;
 417                 battery->update[ACPI_BATTERY_STATE] = 1;
 418                 battery->update[ACPI_BATTERY_ALARM] = 1;
 419         }
 420 }
 421
 422 /* --------------------------------------------------------------------------
 423                               FS Interface (/proc)
 424    -------------------------------------------------------------------------- */
 425
 426 static struct proc_dir_entry *acpi_battery_dir;
 427
 428 static int acpi_battery_print_info(struct seq_file *seq, int result)
 429 {
 430         struct acpi_battery *battery = seq->private;
 431         char *units = "?";
 432
 433         if (result)
 434                 goto end;
 435
 436         if (acpi_battery_present(battery))
 437                 seq_printf(seq, "present:                 yes\n");
 438         else {
 439                 seq_printf(seq, "present:                 no\n");
 440                 goto end;
 441         }
 442
 443         /* Battery Units */
 444
 445         units = acpi_battery_power_units(battery);
 446
 447         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 448                 seq_printf(seq, "design capacity:         unknown\n");
 449         else
 450                 seq_printf(seq, "design capacity:         %d %sh\n",
 451                            (u32) battery->design_capacity, units);
 452
 453         if (battery->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 454                 seq_printf(seq, "last full capacity:      unknown\n");
 455         else
 456                 seq_printf(seq, "last full capacity:      %d %sh\n",
 457                            (u32) battery->last_full_capacity, units);
 458
 459         switch ((u32) battery->technology) {
 460         case 0:
 461                 seq_printf(seq, "battery technology:      non-rechargeable\n");
 462                 break;
 463         case 1:
 464                 seq_printf(seq, "battery technology:      rechargeable\n");
 465                 break;
 466         default:
 467                 seq_printf(seq, "battery technology:      unknown\n");
 468                 break;
 469         }
 470
 471         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 472                 seq_printf(seq, "design voltage:          unknown\n");
 473         else
 474                 seq_printf(seq, "design voltage:          %d mV\n",
 475                            (u32) battery->design_voltage);
 476         seq_printf(seq, "design capacity warning: %d %sh\n",
 477                    (u32) battery->design_capacity_warning, units);
 478         seq_printf(seq, "design capacity low:     %d %sh\n",
 479                    (u32) battery->design_capacity_low, units);
 480         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 481                    (u32) battery->capacity_granularity_1, units);
 482         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 483                    (u32) battery->capacity_granularity_2, units);
 484         seq_printf(seq, "model number:            %s\n", battery->model_number);
 485         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 486         seq_printf(seq, "battery type:            %s\n", battery->type);
 487         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 488
 489       end:
 490
 491         if (result)
 492                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 493
 494         return result;
 495 }
 496
 497 static int acpi_battery_print_state(struct seq_file *seq, int result)
 498 {
 499         struct acpi_battery *battery = seq->private;
 500         char *units = "?";
 501
 502         if (result)
 503                 goto end;
 504
 505         if (acpi_battery_present(battery))
 506                 seq_printf(seq, "present:                 yes\n");
 507         else {
 508                 seq_printf(seq, "present:                 no\n");
 509                 goto end;
 510         }
 511
 512         /* Battery Units */
 513
 514         units = acpi_battery_power_units(battery);
 515
 516         if (!(battery->state & 0x04))
 517                 seq_printf(seq, "capacity state:          ok\n");
 518         else
 519                 seq_printf(seq, "capacity state:          critical\n");
 520
 521         if ((battery->state & 0x01) && (battery->state & 0x02)) {
 522                 seq_printf(seq,
 523                            "charging state:          charging/discharging\n");
 524         } else if (battery->state & 0x01)
 525                 seq_printf(seq, "charging state:          discharging\n");
 526         else if (battery->state & 0x02)
 527                 seq_printf(seq, "charging state:          charging\n");
 528         else {
 529                 seq_printf(seq, "charging state:          charged\n");
 530         }
 531
 532         if (battery->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
 533                 seq_printf(seq, "present rate:            unknown\n");
 534         else
 535                 seq_printf(seq, "present rate:            %d %s\n",
 536                            (u32) battery->present_rate, units);
 537
 538         if (battery->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 539                 seq_printf(seq, "remaining capacity:      unknown\n");
 540         else
 541                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 542                            (u32) battery->remaining_capacity, units);
 543
 544         if (battery->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 545                 seq_printf(seq, "present voltage:         unknown\n");
 546         else
 547                 seq_printf(seq, "present voltage:         %d mV\n",
 548                            (u32) battery->present_voltage);
 549
 550       end:
 551
 552         if (result) {
 553                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 554         }
 555
 556         return result;
 557 }
 558
 559 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 560 {
 561         struct acpi_battery *battery = seq->private;
 562         char *units = "?";
 563
 564         if (result)
 565                 goto end;
 566
 567         if (!acpi_battery_present(battery)) {
 568                 seq_printf(seq, "present:                 no\n");
 569                 goto end;
 570         }
 571
 572         /* Battery Units */
 573
 574         units = acpi_battery_power_units(battery);
 575
 576         seq_printf(seq, "alarm:                   ");
 577         if (!battery->alarm)
 578                 seq_printf(seq, "unsupported\n");
 579         else
 580                 seq_printf(seq, "%lu %sh\n", battery->alarm, units);
 581
 582       end:
 583
 584         if (result)
 585                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 586
 587         return result;
 588 }
 589
 590 static ssize_t
 591 acpi_battery_write_alarm(struct file *file,
 592                          const char __user * buffer,
 593                          size_t count, loff_t * ppos)
 594 {
 595         int result = 0;
 596         char alarm_string[12] = { '\0' };
 597         struct seq_file *m = file->private_data;
 598         struct acpi_battery *battery = m->private;
 599         int update_result = ACPI_BATTERY_NONE_UPDATE;
 600
 601         if (!battery || (count > sizeof(alarm_string) - 1))
 602                 return -EINVAL;
 603
 604         result = acpi_battery_update(battery, 1, &update_result);
 605         if (result) {
 606                 result = -ENODEV;
 607                 goto end;
 608         }
 609
 610         if (!acpi_battery_present(battery)) {
 611                 result = -ENODEV;
 612                 goto end;
 613         }
 614
 615         if (copy_from_user(alarm_string, buffer, count)) {
 616                 result = -EFAULT;
 617                 goto end;
 618         }
 619
 620         alarm_string[count] = '\0';
 621
 622         result = acpi_battery_set_alarm(battery,
 623                                         simple_strtoul(alarm_string, NULL, 0));
 624         if (result)
 625                 goto end;
 626
 627       end:
 628
 629         acpi_battery_check_result(battery, result);
 630
 631         if (!result)
 632                 result = count;
 633         return result;
 634 }
 635
 636 typedef int(*print_func)(struct seq_file *seq, int result);
 637 typedef int(*get_func)(struct acpi_battery *battery);
 638
 639 static struct acpi_read_mux {
 640         print_func print;
 641         get_func get;
 642 } acpi_read_funcs[ACPI_BATTERY_NUMFILES] = {
 643         {.get = acpi_battery_get_info, .print = acpi_battery_print_info},
 644         {.get = acpi_battery_get_state, .print = acpi_battery_print_state},
 645         {.get = acpi_battery_get_alarm, .print = acpi_battery_print_alarm},
 646 };
 647
 648 static int acpi_battery_read(int fid, struct seq_file *seq)
 649 {
 650         struct acpi_battery *battery = seq->private;
 651         int result = 0;
 652         int update_result = ACPI_BATTERY_NONE_UPDATE;
 653         int update = 0;
 654
 655         update = (get_seconds() - battery->update_time[fid] >= update_time);
 656         update = (update | battery->update[fid]);
 657
 658         result = acpi_battery_update(battery, update, &update_result);
 659         if (result)
 660                 goto end;
 661
 662         if (update_result == ACPI_BATTERY_EASY_UPDATE) {
 663                 result = acpi_read_funcs[fid].get(battery);
 664                 if (result)
 665                         goto end;
 666         }
 667
 668       end:
 669         result = acpi_read_funcs[fid].print(seq, result);
 670         acpi_battery_check_result(battery, result);
 671         battery->update[fid] = result;
 672         return result;
 673 }
 674
 675 static int acpi_battery_read_info(struct seq_file *seq, void *offset)
 676 {
 677         return acpi_battery_read(ACPI_BATTERY_INFO, seq);
 678 }
 679
 680 static int acpi_battery_read_state(struct seq_file *seq, void *offset)
 681 {
 682         return acpi_battery_read(ACPI_BATTERY_STATE, seq);
 683 }
 684
 685 static int acpi_battery_read_alarm(struct seq_file *seq, void *offset)
 686 {
 687         return acpi_battery_read(ACPI_BATTERY_ALARM, seq);
 688 }
 689
 690 static int acpi_battery_info_open_fs(struct inode *inode, struct file *file)
 691 {
 692         return single_open(file, acpi_battery_read_info, PDE(inode)->data);
 693 }
 694
 695 static int acpi_battery_state_open_fs(struct inode *inode, struct file *file)
 696 {
 697         return single_open(file, acpi_battery_read_state, PDE(inode)->data);
 698 }
 699
 700 static int acpi_battery_alarm_open_fs(struct inode *inode, struct file *file)
 701 {
 702         return single_open(file, acpi_battery_read_alarm, PDE(inode)->data);
 703 }
 704
 705 static struct battery_file {
 706         struct file_operations ops;
 707         mode_t mode;
 708         char *name;
 709 } acpi_battery_file[] = {
 710         {
 711         .name = "info",
 712         .mode = S_IRUGO,
 713         .ops = {
 714         .open = acpi_battery_info_open_fs,
 715         .read = seq_read,
 716         .llseek = seq_lseek,
 717         .release = single_release,
 718         .owner = THIS_MODULE,
 719         },
 720         },
 721         {
 722         .name = "state",
 723         .mode = S_IRUGO,
 724         .ops = {
 725         .open = acpi_battery_state_open_fs,
 726         .read = seq_read,
 727         .llseek = seq_lseek,
 728         .release = single_release,
 729         .owner = THIS_MODULE,
 730         },
 731         },
 732         {
 733         .name = "alarm",
 734         .mode = S_IFREG | S_IRUGO | S_IWUSR,
 735         .ops = {
 736         .open = acpi_battery_alarm_open_fs,
 737         .read = seq_read,
 738         .write = acpi_battery_write_alarm,
 739         .llseek = seq_lseek,
 740         .release = single_release,
 741         .owner = THIS_MODULE,
 742         },
 743         },
 744 };
 745
 746 static int acpi_battery_add_fs(struct acpi_device *device)
 747 {
 748         struct proc_dir_entry *entry = NULL;
 749         int i;
 750
 751         if (!acpi_device_dir(device)) {
 752                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 753                                                      acpi_battery_dir);
 754                 if (!acpi_device_dir(device))
 755                         return -ENODEV;
 756                 acpi_device_dir(device)->owner = THIS_MODULE;
 757         }
 758
 759         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 760                 entry = create_proc_entry(acpi_battery_file[i].name,
 761                                   acpi_battery_file[i].mode, acpi_device_dir(device));
 762                 if (!entry)
 763                         return -ENODEV;
 764                 else {
 765                         entry->proc_fops = &acpi_battery_file[i].ops;
 766                         entry->data = acpi_driver_data(device);
 767                         entry->owner = THIS_MODULE;
 768                 }
 769         }
 770
 771         return 0;
 772 }
 773
 774 static int acpi_battery_remove_fs(struct acpi_device *device)
 775 {
 776         int i;
 777         if (acpi_device_dir(device)) {
 778                 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 779                         remove_proc_entry(acpi_battery_file[i].name,
 780                                   acpi_device_dir(device));
 781                 }
 782                 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 783                 acpi_device_dir(device) = NULL;
 784         }
 785
 786         return 0;
 787 }
 788
 789 /* --------------------------------------------------------------------------
 790                                  Driver Interface
 791    -------------------------------------------------------------------------- */
 792
 793 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
 794 {
 795         struct acpi_battery *battery = data;
 796         struct acpi_device *device = NULL;
 797
 798         if (!battery)
 799                 return;
 800
 801         device = battery->device;
 802
 803         switch (event) {
 804         case ACPI_BATTERY_NOTIFY_STATUS:
 805         case ACPI_BATTERY_NOTIFY_INFO:
 806         case ACPI_NOTIFY_BUS_CHECK:
 807         case ACPI_NOTIFY_DEVICE_CHECK:
 808                 device = battery->device;
 809                 acpi_battery_notify_update(battery);
 810                 acpi_bus_generate_proc_event(device, event,
 811                                         acpi_battery_present(battery));
 812                 acpi_bus_generate_netlink_event(device->pnp.device_class,
 813                                                   device->dev.bus_id, event,
 814                                                   acpi_battery_present(battery));
 815                 break;
 816         default:
 817                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 818                                   "Unsupported event [0x%x]\n", event));
 819                 break;
 820         }
 821
 822         return;
 823 }
 824
 825 static int acpi_battery_add(struct acpi_device *device)
 826 {
 827         int result = 0;
 828         acpi_status status = 0;
 829         struct acpi_battery *battery = NULL;
 830
 831         if (!device)
 832                 return -EINVAL;
 833
 834         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 835         if (!battery)
 836                 return -ENOMEM;
 837
 838         battery->device = device;
 839         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 840         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 841         acpi_driver_data(device) = battery;
 842         mutex_init(&battery->lock);
 843         result = acpi_battery_get_status(battery);
 844         if (result)
 845                 goto end;
 846
 847         battery->init_update = 1;
 848
 849         result = acpi_battery_add_fs(device);
 850         if (result)
 851                 goto end;
 852
 853         status = acpi_install_notify_handler(device->handle,
 854                                              ACPI_ALL_NOTIFY,
 855                                              acpi_battery_notify, battery);
 856         if (ACPI_FAILURE(status)) {
 857                 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
 858                 result = -ENODEV;
 859                 goto end;
 860         }
 861
 862         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 863                ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 864                device->status.battery_present ? "present" : "absent");
 865
 866       end:
 867
 868         if (result) {
 869                 acpi_battery_remove_fs(device);
 870                 kfree(battery);
 871         }
 872
 873         return result;
 874 }
 875
 876 static int acpi_battery_remove(struct acpi_device *device, int type)
 877 {
 878         acpi_status status = 0;
 879         struct acpi_battery *battery = NULL;
 880
 881         if (!device || !acpi_driver_data(device))
 882                 return -EINVAL;
 883
 884         battery = acpi_driver_data(device);
 885
 886         status = acpi_remove_notify_handler(device->handle,
 887                                             ACPI_ALL_NOTIFY,
 888                                             acpi_battery_notify);
 889
 890         acpi_battery_remove_fs(device);
 891         mutex_destroy(&battery->lock);
 892         kfree(battery);
 893
 894         return 0;
 895 }
 896
 897 /* this is needed to learn about changes made in suspended state */
 898 static int acpi_battery_resume(struct acpi_device *device)
 899 {
 900         struct acpi_battery *battery;
 901
 902         if (!device)
 903                 return -EINVAL;
 904
 905         battery = device->driver_data;
 906
 907         battery->init_update = 1;
 908
 909         return 0;
 910 }
 911
 912 static int __init acpi_battery_init(void)
 913 {
 914         int result;
 915
 916         if (acpi_disabled)
 917                 return -ENODEV;
 918
 919         acpi_battery_dir = acpi_lock_battery_dir();
 920         if (!acpi_battery_dir)
 921                 return -ENODEV;
 922
 923         result = acpi_bus_register_driver(&acpi_battery_driver);
 924         if (result < 0) {
 925                 acpi_unlock_battery_dir(acpi_battery_dir);
 926                 return -ENODEV;
 927         }
 928
 929         return 0;
 930 }
 931
 932 static void __exit acpi_battery_exit(void)
 933 {
 934         acpi_bus_unregister_driver(&acpi_battery_driver);
 935
 936         acpi_unlock_battery_dir(acpi_battery_dir);
 937
 938         return;
 939 }
 940
 941 module_init(acpi_battery_init);
 942 module_exit(acpi_battery_exit);