drivers/acpi/battery.c

   1 /*
   2  *  battery.c - ACPI Battery Driver (Revision: 2.0)
   3  *
   4  *  Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de>
   5  *  Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com>
   6  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   7  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   8  *
   9  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License as published by
  13  *  the Free Software Foundation; either version 2 of the License, or (at
  14  *  your option) any later version.
  15  *
  16  *  This program is distributed in the hope that it will be useful, but
  17  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  *  General Public License for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with this program; if not, write to the Free Software Foundation, Inc.,
  23  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  24  *
  25  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31 #include <linux/types.h>
  32 #include <linux/jiffies.h>
  33
  34 #ifdef CONFIG_ACPI_PROCFS
  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 #include <linux/power_supply.h>
  44
  45 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF
  46
  47 #define ACPI_BATTERY_COMPONENT          0x00040000
  48 #define ACPI_BATTERY_CLASS              "battery"
  49 #define ACPI_BATTERY_DEVICE_NAME        "Battery"
  50 #define ACPI_BATTERY_NOTIFY_STATUS      0x80
  51 #define ACPI_BATTERY_NOTIFY_INFO        0x81
  52
  53 #define _COMPONENT              ACPI_BATTERY_COMPONENT
  54
  55 ACPI_MODULE_NAME("battery");
  56
  57 MODULE_AUTHOR("Paul Diefenbaugh");
  58 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>");
  59 MODULE_DESCRIPTION("ACPI Battery Driver");
  60 MODULE_LICENSE("GPL");
  61
  62 static unsigned int cache_time = 1000;
  63 module_param(cache_time, uint, 0644);
  64 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
  65
  66 #ifdef CONFIG_ACPI_PROCFS
  67 extern struct proc_dir_entry *acpi_lock_battery_dir(void);
  68 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir);
  69
  70 enum acpi_battery_files {
  71         info_tag = 0,
  72         state_tag,
  73         alarm_tag,
  74         ACPI_BATTERY_NUMFILES,
  75 };
  76
  77 #endif
  78
  79 static const struct acpi_device_id battery_device_ids[] = {
  80         {"PNP0C0A", 0},
  81         {"", 0},
  82 };
  83
  84 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
  85
  86
  87 struct acpi_battery {
  88         struct mutex lock;
  89         struct power_supply bat;
  90         struct acpi_device *device;
  91         unsigned long update_time;
  92         int current_now;
  93         int capacity_now;
  94         int voltage_now;
  95         int design_capacity;
  96         int full_charge_capacity;
  97         int technology;
  98         int design_voltage;
  99         int design_capacity_warning;
 100         int design_capacity_low;
 101         int capacity_granularity_1;
 102         int capacity_granularity_2;
 103         int alarm;
 104         char model_number[32];
 105         char serial_number[32];
 106         char type[32];
 107         char oem_info[32];
 108         int state;
 109         int power_unit;
 110         u8 alarm_present;
 111 };
 112
 113 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat);
 114
 115 inline int acpi_battery_present(struct acpi_battery *battery)
 116 {
 117         return battery->device->status.battery_present;
 118 }
 119
 120 static int acpi_battery_technology(struct acpi_battery *battery)
 121 {
 122         if (!strcasecmp("NiCd", battery->type))
 123                 return POWER_SUPPLY_TECHNOLOGY_NiCd;
 124         if (!strcasecmp("NiMH", battery->type))
 125                 return POWER_SUPPLY_TECHNOLOGY_NiMH;
 126         if (!strcasecmp("LION", battery->type))
 127                 return POWER_SUPPLY_TECHNOLOGY_LION;
 128         if (!strcasecmp("LiP", battery->type))
 129                 return POWER_SUPPLY_TECHNOLOGY_LIPO;
 130         return POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
 131 }
 132
 133 static int acpi_battery_update(struct acpi_battery *battery);
 134
 135 static int acpi_battery_get_property(struct power_supply *psy,
 136                                      enum power_supply_property psp,
 137                                      union power_supply_propval *val)
 138 {
 139         struct acpi_battery *battery = to_acpi_battery(psy);
 140
 141         if ((!acpi_battery_present(battery)) &&
 142              psp != POWER_SUPPLY_PROP_PRESENT)
 143                 return -ENODEV;
 144         acpi_battery_update(battery);
 145         switch (psp) {
 146         case POWER_SUPPLY_PROP_STATUS:
 147                 if (battery->state & 0x01)
 148                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 149                 else if (battery->state & 0x02)
 150                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 151                 else if (battery->state == 0)
 152                         val->intval = POWER_SUPPLY_STATUS_FULL;
 153                 break;
 154         case POWER_SUPPLY_PROP_PRESENT:
 155                 val->intval = acpi_battery_present(battery);
 156                 break;
 157         case POWER_SUPPLY_PROP_TECHNOLOGY:
 158                 val->intval = acpi_battery_technology(battery);
 159                 break;
 160         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 161                 val->intval = battery->design_voltage * 1000;
 162                 break;
 163         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 164                 val->intval = battery->voltage_now * 1000;
 165                 break;
 166         case POWER_SUPPLY_PROP_CURRENT_NOW:
 167                 val->intval = battery->current_now * 1000;
 168                 break;
 169         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 170         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
 171                 val->intval = battery->design_capacity * 1000;
 172                 break;
 173         case POWER_SUPPLY_PROP_CHARGE_FULL:
 174         case POWER_SUPPLY_PROP_ENERGY_FULL:
 175                 val->intval = battery->full_charge_capacity * 1000;
 176                 break;
 177         case POWER_SUPPLY_PROP_CHARGE_NOW:
 178         case POWER_SUPPLY_PROP_ENERGY_NOW:
 179                 val->intval = battery->capacity_now * 1000;
 180                 break;
 181         case POWER_SUPPLY_PROP_MODEL_NAME:
 182                 val->strval = battery->model_number;
 183                 break;
 184         case POWER_SUPPLY_PROP_MANUFACTURER:
 185                 val->strval = battery->oem_info;
 186                 break;
 187         default:
 188                 return -EINVAL;
 189         }
 190         return 0;
 191 }
 192
 193 static enum power_supply_property charge_battery_props[] = {
 194         POWER_SUPPLY_PROP_STATUS,
 195         POWER_SUPPLY_PROP_PRESENT,
 196         POWER_SUPPLY_PROP_TECHNOLOGY,
 197         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 198         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 199         POWER_SUPPLY_PROP_CURRENT_NOW,
 200         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 201         POWER_SUPPLY_PROP_CHARGE_FULL,
 202         POWER_SUPPLY_PROP_CHARGE_NOW,
 203         POWER_SUPPLY_PROP_MODEL_NAME,
 204         POWER_SUPPLY_PROP_MANUFACTURER,
 205 };
 206
 207 static enum power_supply_property energy_battery_props[] = {
 208         POWER_SUPPLY_PROP_STATUS,
 209         POWER_SUPPLY_PROP_PRESENT,
 210         POWER_SUPPLY_PROP_TECHNOLOGY,
 211         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 212         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 213         POWER_SUPPLY_PROP_CURRENT_NOW,
 214         POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
 215         POWER_SUPPLY_PROP_ENERGY_FULL,
 216         POWER_SUPPLY_PROP_ENERGY_NOW,
 217         POWER_SUPPLY_PROP_MODEL_NAME,
 218         POWER_SUPPLY_PROP_MANUFACTURER,
 219 };
 220
 221 #ifdef CONFIG_ACPI_PROCFS
 222 inline char *acpi_battery_units(struct acpi_battery *battery)
 223 {
 224         return (battery->power_unit)?"mA":"mW";
 225 }
 226 #endif
 227
 228 /* --------------------------------------------------------------------------
 229                                Battery Management
 230    -------------------------------------------------------------------------- */
 231 struct acpi_offsets {
 232         size_t offset;          /* offset inside struct acpi_sbs_battery */
 233         u8 mode;                /* int or string? */
 234 };
 235
 236 static struct acpi_offsets state_offsets[] = {
 237         {offsetof(struct acpi_battery, state), 0},
 238         {offsetof(struct acpi_battery, current_now), 0},
 239         {offsetof(struct acpi_battery, capacity_now), 0},
 240         {offsetof(struct acpi_battery, voltage_now), 0},
 241 };
 242
 243 static struct acpi_offsets info_offsets[] = {
 244         {offsetof(struct acpi_battery, power_unit), 0},
 245         {offsetof(struct acpi_battery, design_capacity), 0},
 246         {offsetof(struct acpi_battery, full_charge_capacity), 0},
 247         {offsetof(struct acpi_battery, technology), 0},
 248         {offsetof(struct acpi_battery, design_voltage), 0},
 249         {offsetof(struct acpi_battery, design_capacity_warning), 0},
 250         {offsetof(struct acpi_battery, design_capacity_low), 0},
 251         {offsetof(struct acpi_battery, capacity_granularity_1), 0},
 252         {offsetof(struct acpi_battery, capacity_granularity_2), 0},
 253         {offsetof(struct acpi_battery, model_number), 1},
 254         {offsetof(struct acpi_battery, serial_number), 1},
 255         {offsetof(struct acpi_battery, type), 1},
 256         {offsetof(struct acpi_battery, oem_info), 1},
 257 };
 258
 259 static int extract_package(struct acpi_battery *battery,
 260                            union acpi_object *package,
 261                            struct acpi_offsets *offsets, int num)
 262 {
 263         int i, *x;
 264         union acpi_object *element;
 265         if (package->type != ACPI_TYPE_PACKAGE)
 266                 return -EFAULT;
 267         for (i = 0; i < num; ++i) {
 268                 if (package->package.count <= i)
 269                         return -EFAULT;
 270                 element = &package->package.elements[i];
 271                 if (offsets[i].mode) {
 272                         if (element->type != ACPI_TYPE_STRING &&
 273                             element->type != ACPI_TYPE_BUFFER)
 274                                 return -EFAULT;
 275                         strncpy((u8 *)battery + offsets[i].offset,
 276                                 element->string.pointer, 32);
 277                 } else {
 278                         if (element->type != ACPI_TYPE_INTEGER)
 279                                 return -EFAULT;
 280                         x = (int *)((u8 *)battery + offsets[i].offset);
 281                         *x = element->integer.value;
 282                 }
 283         }
 284         return 0;
 285 }
 286
 287 static int acpi_battery_get_status(struct acpi_battery *battery)
 288 {
 289         if (acpi_bus_get_status(battery->device)) {
 290                 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA"));
 291                 return -ENODEV;
 292         }
 293         return 0;
 294 }
 295
 296 static int acpi_battery_get_info(struct acpi_battery *battery)
 297 {
 298         int result = -EFAULT;
 299         acpi_status status = 0;
 300         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 301
 302         if (!acpi_battery_present(battery))
 303                 return 0;
 304         mutex_lock(&battery->lock);
 305         status = acpi_evaluate_object(battery->device->handle, "_BIF",
 306                                       NULL, &buffer);
 307         mutex_unlock(&battery->lock);
 308
 309         if (ACPI_FAILURE(status)) {
 310                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
 311                 return -ENODEV;
 312         }
 313
 314         result = extract_package(battery, buffer.pointer,
 315                                  info_offsets, ARRAY_SIZE(info_offsets));
 316         kfree(buffer.pointer);
 317         return result;
 318 }
 319
 320 static int acpi_battery_get_state(struct acpi_battery *battery)
 321 {
 322         int result = 0;
 323         acpi_status status = 0;
 324         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 325
 326         if (!acpi_battery_present(battery))
 327                 return 0;
 328
 329         if (battery->update_time &&
 330             time_before(jiffies, battery->update_time +
 331                         msecs_to_jiffies(cache_time)))
 332                 return 0;
 333
 334         mutex_lock(&battery->lock);
 335         status = acpi_evaluate_object(battery->device->handle, "_BST",
 336                                       NULL, &buffer);
 337         mutex_unlock(&battery->lock);
 338
 339         if (ACPI_FAILURE(status)) {
 340                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
 341                 return -ENODEV;
 342         }
 343
 344         result = extract_package(battery, buffer.pointer,
 345                                  state_offsets, ARRAY_SIZE(state_offsets));
 346         battery->update_time = jiffies;
 347         kfree(buffer.pointer);
 348         return result;
 349 }
 350
 351 static int acpi_battery_set_alarm(struct acpi_battery *battery)
 352 {
 353         acpi_status status = 0;
 354         union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER };
 355         struct acpi_object_list arg_list = { 1, &arg0 };
 356
 357         if (!acpi_battery_present(battery)|| !battery->alarm_present)
 358                 return -ENODEV;
 359
 360         arg0.integer.value = battery->alarm;
 361
 362         mutex_lock(&battery->lock);
 363         status = acpi_evaluate_object(battery->device->handle, "_BTP",
 364                                  &arg_list, NULL);
 365         mutex_unlock(&battery->lock);
 366
 367         if (ACPI_FAILURE(status))
 368                 return -ENODEV;
 369
 370         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm));
 371         return 0;
 372 }
 373
 374 static int acpi_battery_init_alarm(struct acpi_battery *battery)
 375 {
 376         acpi_status status = AE_OK;
 377         acpi_handle handle = NULL;
 378
 379         /* See if alarms are supported, and if so, set default */
 380         status = acpi_get_handle(battery->device->handle, "_BTP", &handle);
 381         if (ACPI_FAILURE(status)) {
 382                 battery->alarm_present = 0;
 383                 return 0;
 384         }
 385         battery->alarm_present = 1;
 386         if (!battery->alarm)
 387                 battery->alarm = battery->design_capacity_warning;
 388         return acpi_battery_set_alarm(battery);
 389 }
 390
 391 static ssize_t acpi_battery_alarm_show(struct device *dev,
 392                                         struct device_attribute *attr,
 393                                         char *buf)
 394 {
 395         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 396         return sprintf(buf, "%d\n", battery->alarm * 1000);
 397 }
 398
 399 static ssize_t acpi_battery_alarm_store(struct device *dev,
 400                                         struct device_attribute *attr,
 401                                         const char *buf, size_t count)
 402 {
 403         unsigned long x;
 404         struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev));
 405         if (sscanf(buf, "%ld\n", &x) == 1)
 406                 battery->alarm = x/1000;
 407         if (acpi_battery_present(battery))
 408                 acpi_battery_set_alarm(battery);
 409         return count;
 410 }
 411
 412 static struct device_attribute alarm_attr = {
 413         .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE},
 414         .show = acpi_battery_alarm_show,
 415         .store = acpi_battery_alarm_store,
 416 };
 417
 418 static int sysfs_add_battery(struct acpi_battery *battery)
 419 {
 420         int result;
 421
 422         battery->update_time = 0;
 423         result = acpi_battery_get_info(battery);
 424         acpi_battery_init_alarm(battery);
 425         if (result)
 426                 return result;
 427         if (battery->power_unit) {
 428                 battery->bat.properties = charge_battery_props;
 429                 battery->bat.num_properties =
 430                         ARRAY_SIZE(charge_battery_props);
 431         } else {
 432                 battery->bat.properties = energy_battery_props;
 433                 battery->bat.num_properties =
 434                         ARRAY_SIZE(energy_battery_props);
 435         }
 436
 437         battery->bat.name = acpi_device_bid(battery->device);
 438         battery->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 439         battery->bat.get_property = acpi_battery_get_property;
 440
 441         result = power_supply_register(&battery->device->dev, &battery->bat);
 442         if (result)
 443                 return result;
 444         return device_create_file(battery->bat.dev, &alarm_attr);
 445 }
 446
 447 static void sysfs_remove_battery(struct acpi_battery *battery)
 448 {
 449         if (!battery->bat.dev)
 450                 return;
 451         device_remove_file(battery->bat.dev, &alarm_attr);
 452         power_supply_unregister(&battery->bat);
 453 }
 454
 455 static int acpi_battery_update(struct acpi_battery *battery)
 456 {
 457         int result = acpi_battery_get_status(battery);
 458         if (result)
 459                 return result;
 460         if (!acpi_battery_present(battery)) {
 461                 sysfs_remove_battery(battery);
 462                 return 0;
 463         }
 464         if (!battery->bat.dev)
 465                 sysfs_add_battery(battery);
 466         return acpi_battery_get_state(battery);
 467 }
 468
 469 /* --------------------------------------------------------------------------
 470                               FS Interface (/proc)
 471    -------------------------------------------------------------------------- */
 472
 473 #ifdef CONFIG_ACPI_PROCFS
 474 static struct proc_dir_entry *acpi_battery_dir;
 475
 476 static int acpi_battery_print_info(struct seq_file *seq, int result)
 477 {
 478         struct acpi_battery *battery = seq->private;
 479
 480         if (result)
 481                 goto end;
 482
 483         seq_printf(seq, "present:                 %s\n",
 484                    acpi_battery_present(battery)?"yes":"no");
 485         if (!acpi_battery_present(battery))
 486                 goto end;
 487         if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 488                 seq_printf(seq, "design capacity:         unknown\n");
 489         else
 490                 seq_printf(seq, "design capacity:         %d %sh\n",
 491                            battery->design_capacity,
 492                            acpi_battery_units(battery));
 493
 494         if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
 495                 seq_printf(seq, "last full capacity:      unknown\n");
 496         else
 497                 seq_printf(seq, "last full capacity:      %d %sh\n",
 498                            battery->full_charge_capacity,
 499                            acpi_battery_units(battery));
 500
 501         seq_printf(seq, "battery technology:      %srechargeable\n",
 502                    (!battery->technology)?"non-":"");
 503
 504         if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
 505                 seq_printf(seq, "design voltage:          unknown\n");
 506         else
 507                 seq_printf(seq, "design voltage:          %d mV\n",
 508                            battery->design_voltage);
 509         seq_printf(seq, "design capacity warning: %d %sh\n",
 510                    battery->design_capacity_warning,
 511                    acpi_battery_units(battery));
 512         seq_printf(seq, "design capacity low:     %d %sh\n",
 513                    battery->design_capacity_low,
 514                    acpi_battery_units(battery));
 515         seq_printf(seq, "capacity granularity 1:  %d %sh\n",
 516                    battery->capacity_granularity_1,
 517                    acpi_battery_units(battery));
 518         seq_printf(seq, "capacity granularity 2:  %d %sh\n",
 519                    battery->capacity_granularity_2,
 520                    acpi_battery_units(battery));
 521         seq_printf(seq, "model number:            %s\n", battery->model_number);
 522         seq_printf(seq, "serial number:           %s\n", battery->serial_number);
 523         seq_printf(seq, "battery type:            %s\n", battery->type);
 524         seq_printf(seq, "OEM info:                %s\n", battery->oem_info);
 525       end:
 526         if (result)
 527                 seq_printf(seq, "ERROR: Unable to read battery info\n");
 528         return result;
 529 }
 530
 531 static int acpi_battery_print_state(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
 543         seq_printf(seq, "capacity state:          %s\n",
 544                         (battery->state & 0x04)?"critical":"ok");
 545         if ((battery->state & 0x01) && (battery->state & 0x02))
 546                 seq_printf(seq,
 547                            "charging state:          charging/discharging\n");
 548         else if (battery->state & 0x01)
 549                 seq_printf(seq, "charging state:          discharging\n");
 550         else if (battery->state & 0x02)
 551                 seq_printf(seq, "charging state:          charging\n");
 552         else
 553                 seq_printf(seq, "charging state:          charged\n");
 554
 555         if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN)
 556                 seq_printf(seq, "present rate:            unknown\n");
 557         else
 558                 seq_printf(seq, "present rate:            %d %s\n",
 559                            battery->current_now, acpi_battery_units(battery));
 560
 561         if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN)
 562                 seq_printf(seq, "remaining capacity:      unknown\n");
 563         else
 564                 seq_printf(seq, "remaining capacity:      %d %sh\n",
 565                            battery->capacity_now, acpi_battery_units(battery));
 566         if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN)
 567                 seq_printf(seq, "present voltage:         unknown\n");
 568         else
 569                 seq_printf(seq, "present voltage:         %d mV\n",
 570                            battery->voltage_now);
 571       end:
 572         if (result)
 573                 seq_printf(seq, "ERROR: Unable to read battery state\n");
 574
 575         return result;
 576 }
 577
 578 static int acpi_battery_print_alarm(struct seq_file *seq, int result)
 579 {
 580         struct acpi_battery *battery = seq->private;
 581
 582         if (result)
 583                 goto end;
 584
 585         if (!acpi_battery_present(battery)) {
 586                 seq_printf(seq, "present:                 no\n");
 587                 goto end;
 588         }
 589         seq_printf(seq, "alarm:                   ");
 590         if (!battery->alarm)
 591                 seq_printf(seq, "unsupported\n");
 592         else
 593                 seq_printf(seq, "%u %sh\n", battery->alarm,
 594                                 acpi_battery_units(battery));
 595       end:
 596         if (result)
 597                 seq_printf(seq, "ERROR: Unable to read battery alarm\n");
 598         return result;
 599 }
 600
 601 static ssize_t acpi_battery_write_alarm(struct file *file,
 602                                         const char __user * buffer,
 603                                         size_t count, loff_t * ppos)
 604 {
 605         int result = 0;
 606         char alarm_string[12] = { '\0' };
 607         struct seq_file *m = file->private_data;
 608         struct acpi_battery *battery = m->private;
 609
 610         if (!battery || (count > sizeof(alarm_string) - 1))
 611                 return -EINVAL;
 612         if (!acpi_battery_present(battery)) {
 613                 result = -ENODEV;
 614                 goto end;
 615         }
 616         if (copy_from_user(alarm_string, buffer, count)) {
 617                 result = -EFAULT;
 618                 goto end;
 619         }
 620         alarm_string[count] = '\0';
 621         battery->alarm = simple_strtol(alarm_string, NULL, 0);
 622         result = acpi_battery_set_alarm(battery);
 623       end:
 624         if (!result)
 625                 return count;
 626         return result;
 627 }
 628
 629 typedef int(*print_func)(struct seq_file *seq, int result);
 630
 631 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = {
 632         acpi_battery_print_info,
 633         acpi_battery_print_state,
 634         acpi_battery_print_alarm,
 635 };
 636
 637 static int acpi_battery_read(int fid, struct seq_file *seq)
 638 {
 639         struct acpi_battery *battery = seq->private;
 640         int result = acpi_battery_update(battery);
 641         return acpi_print_funcs[fid](seq, result);
 642 }
 643
 644 #define DECLARE_FILE_FUNCTIONS(_name) \
 645 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \
 646 { \
 647         return acpi_battery_read(_name##_tag, seq); \
 648 } \
 649 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \
 650 { \
 651         return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \
 652 }
 653
 654 DECLARE_FILE_FUNCTIONS(info);
 655 DECLARE_FILE_FUNCTIONS(state);
 656 DECLARE_FILE_FUNCTIONS(alarm);
 657
 658 #undef DECLARE_FILE_FUNCTIONS
 659
 660 #define FILE_DESCRIPTION_RO(_name) \
 661         { \
 662         .name = __stringify(_name), \
 663         .mode = S_IRUGO, \
 664         .ops = { \
 665                 .open = acpi_battery_##_name##_open_fs, \
 666                 .read = seq_read, \
 667                 .llseek = seq_lseek, \
 668                 .release = single_release, \
 669                 .owner = THIS_MODULE, \
 670                 }, \
 671         }
 672
 673 #define FILE_DESCRIPTION_RW(_name) \
 674         { \
 675         .name = __stringify(_name), \
 676         .mode = S_IFREG | S_IRUGO | S_IWUSR, \
 677         .ops = { \
 678                 .open = acpi_battery_##_name##_open_fs, \
 679                 .read = seq_read, \
 680                 .llseek = seq_lseek, \
 681                 .write = acpi_battery_write_##_name, \
 682                 .release = single_release, \
 683                 .owner = THIS_MODULE, \
 684                 }, \
 685         }
 686
 687 static struct battery_file {
 688         struct file_operations ops;
 689         mode_t mode;
 690         char *name;
 691 } acpi_battery_file[] = {
 692         FILE_DESCRIPTION_RO(info),
 693         FILE_DESCRIPTION_RO(state),
 694         FILE_DESCRIPTION_RW(alarm),
 695 };
 696
 697 #undef FILE_DESCRIPTION_RO
 698 #undef FILE_DESCRIPTION_RW
 699
 700 static int acpi_battery_add_fs(struct acpi_device *device)
 701 {
 702         struct proc_dir_entry *entry = NULL;
 703         int i;
 704
 705         if (!acpi_device_dir(device)) {
 706                 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
 707                                                      acpi_battery_dir);
 708                 if (!acpi_device_dir(device))
 709                         return -ENODEV;
 710                 acpi_device_dir(device)->owner = THIS_MODULE;
 711         }
 712
 713         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) {
 714                 entry = create_proc_entry(acpi_battery_file[i].name,
 715                                   acpi_battery_file[i].mode, acpi_device_dir(device));
 716                 if (!entry)
 717                         return -ENODEV;
 718                 else {
 719                         entry->proc_fops = &acpi_battery_file[i].ops;
 720                         entry->data = acpi_driver_data(device);
 721                         entry->owner = THIS_MODULE;
 722                 }
 723         }
 724         return 0;
 725 }
 726
 727 static void acpi_battery_remove_fs(struct acpi_device *device)
 728 {
 729         int i;
 730         if (!acpi_device_dir(device))
 731                 return;
 732         for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i)
 733                 remove_proc_entry(acpi_battery_file[i].name,
 734                                   acpi_device_dir(device));
 735
 736         remove_proc_entry(acpi_device_bid(device), acpi_battery_dir);
 737         acpi_device_dir(device) = NULL;
 738 }
 739
 740 #endif
 741
 742 /* --------------------------------------------------------------------------
 743                                  Driver Interface
 744    -------------------------------------------------------------------------- */
 745
 746 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data)
 747 {
 748         struct acpi_battery *battery = data;
 749         struct acpi_device *device;
 750         if (!battery)
 751                 return;
 752         device = battery->device;
 753         acpi_battery_update(battery);
 754         acpi_bus_generate_proc_event(device, event,
 755                                      acpi_battery_present(battery));
 756         acpi_bus_generate_netlink_event(device->pnp.device_class,
 757                                         device->dev.bus_id, event,
 758                                         acpi_battery_present(battery));
 759         /* acpi_batter_update could remove power_supply object */
 760         if (battery->bat.dev)
 761                 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE);
 762 }
 763
 764 static int acpi_battery_add(struct acpi_device *device)
 765 {
 766         int result = 0;
 767         acpi_status status = 0;
 768         struct acpi_battery *battery = NULL;
 769         if (!device)
 770                 return -EINVAL;
 771         battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL);
 772         if (!battery)
 773                 return -ENOMEM;
 774         battery->device = device;
 775         strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME);
 776         strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS);
 777         acpi_driver_data(device) = battery;
 778         mutex_init(&battery->lock);
 779         acpi_battery_update(battery);
 780 #ifdef CONFIG_ACPI_PROCFS
 781         result = acpi_battery_add_fs(device);
 782         if (result)
 783                 goto end;
 784 #endif
 785         status = acpi_install_notify_handler(device->handle,
 786                                              ACPI_ALL_NOTIFY,
 787                                              acpi_battery_notify, battery);
 788         if (ACPI_FAILURE(status)) {
 789                 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler"));
 790                 result = -ENODEV;
 791                 goto end;
 792         }
 793         printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n",
 794                ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device),
 795                device->status.battery_present ? "present" : "absent");
 796       end:
 797         if (result) {
 798 #ifdef CONFIG_ACPI_PROCFS
 799                 acpi_battery_remove_fs(device);
 800 #endif
 801                 kfree(battery);
 802         }
 803         return result;
 804 }
 805
 806 static int acpi_battery_remove(struct acpi_device *device, int type)
 807 {
 808         acpi_status status = 0;
 809         struct acpi_battery *battery = NULL;
 810
 811         if (!device || !acpi_driver_data(device))
 812                 return -EINVAL;
 813         battery = acpi_driver_data(device);
 814         status = acpi_remove_notify_handler(device->handle,
 815                                             ACPI_ALL_NOTIFY,
 816                                             acpi_battery_notify);
 817 #ifdef CONFIG_ACPI_PROCFS
 818         acpi_battery_remove_fs(device);
 819 #endif
 820         sysfs_remove_battery(battery);
 821         mutex_destroy(&battery->lock);
 822         kfree(battery);
 823         return 0;
 824 }
 825
 826 /* this is needed to learn about changes made in suspended state */
 827 static int acpi_battery_resume(struct acpi_device *device)
 828 {
 829         struct acpi_battery *battery;
 830         if (!device)
 831                 return -EINVAL;
 832         battery = acpi_driver_data(device);
 833         battery->update_time = 0;
 834         acpi_battery_update(battery);
 835         return 0;
 836 }
 837
 838 static struct acpi_driver acpi_battery_driver = {
 839         .name = "battery",
 840         .class = ACPI_BATTERY_CLASS,
 841         .ids = battery_device_ids,
 842         .ops = {
 843                 .add = acpi_battery_add,
 844                 .resume = acpi_battery_resume,
 845                 .remove = acpi_battery_remove,
 846                 },
 847 };
 848
 849 static int __init acpi_battery_init(void)
 850 {
 851         if (acpi_disabled)
 852                 return -ENODEV;
 853 #ifdef CONFIG_ACPI_PROCFS
 854         acpi_battery_dir = acpi_lock_battery_dir();
 855         if (!acpi_battery_dir)
 856                 return -ENODEV;
 857 #endif
 858         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
 859 #ifdef CONFIG_ACPI_PROCFS
 860                 acpi_unlock_battery_dir(acpi_battery_dir);
 861 #endif
 862                 return -ENODEV;
 863         }
 864         return 0;
 865 }
 866
 867 static void __exit acpi_battery_exit(void)
 868 {
 869         acpi_bus_unregister_driver(&acpi_battery_driver);
 870 #ifdef CONFIG_ACPI_PROCFS
 871         acpi_unlock_battery_dir(acpi_battery_dir);
 872 #endif
 873 }
 874
 875 module_init(acpi_battery_init);
 876 module_exit(acpi_battery_exit);