1 /* 2 * battery.c - ACPI Battery Driver (Revision: 2.0) 3 * 4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de> 5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com> 6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 8 * 9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or (at 14 * your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License along 22 * with this program; if not, write to the Free Software Foundation, Inc., 23 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 24 * 25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 26 */ 27 28 #include <linux/kernel.h> 29 #include <linux/module.h> 30 #include <linux/init.h> 31 #include <linux/types.h> 32 #include <linux/jiffies.h> 33 #include <linux/async.h> 34 #include <linux/dmi.h> 35 #include <linux/slab.h> 36 #include <linux/suspend.h> 37 38 #ifdef CONFIG_ACPI_PROCFS_POWER 39 #include <linux/proc_fs.h> 40 #include <linux/seq_file.h> 41 #include <asm/uaccess.h> 42 #endif 43 44 #include <acpi/acpi_bus.h> 45 #include <acpi/acpi_drivers.h> 46 #include <linux/power_supply.h> 47 48 #define PREFIX "ACPI: " 49 50 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF 51 52 #define ACPI_BATTERY_CLASS "battery" 53 #define ACPI_BATTERY_DEVICE_NAME "Battery" 54 #define ACPI_BATTERY_NOTIFY_STATUS 0x80 55 #define ACPI_BATTERY_NOTIFY_INFO 0x81 56 #define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82 57 58 /* Battery power unit: 0 means mW, 1 means mA */ 59 #define ACPI_BATTERY_POWER_UNIT_MA 1 60 61 #define _COMPONENT ACPI_BATTERY_COMPONENT 62 63 ACPI_MODULE_NAME("battery"); 64 65 MODULE_AUTHOR("Paul Diefenbaugh"); 66 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 67 MODULE_DESCRIPTION("ACPI Battery Driver"); 68 MODULE_LICENSE("GPL"); 69 70 static unsigned int cache_time = 1000; 71 module_param(cache_time, uint, 0644); 72 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 73 74 #ifdef CONFIG_ACPI_PROCFS_POWER 75 extern struct proc_dir_entry *acpi_lock_battery_dir(void); 76 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir); 77 78 enum acpi_battery_files { 79 info_tag = 0, 80 state_tag, 81 alarm_tag, 82 ACPI_BATTERY_NUMFILES, 83 }; 84 85 #endif 86 87 static const struct acpi_device_id battery_device_ids[] = { 88 {"PNP0C0A", 0}, 89 {"", 0}, 90 }; 91 92 MODULE_DEVICE_TABLE(acpi, battery_device_ids); 93 94 enum { 95 ACPI_BATTERY_ALARM_PRESENT, 96 ACPI_BATTERY_XINFO_PRESENT, 97 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 98 }; 99 100 struct acpi_battery { 101 struct mutex lock; 102 struct mutex sysfs_lock; 103 struct power_supply bat; 104 struct acpi_device *device; 105 struct notifier_block pm_nb; 106 unsigned long update_time; 107 int rate_now; 108 int capacity_now; 109 int voltage_now; 110 int design_capacity; 111 int full_charge_capacity; 112 int technology; 113 int design_voltage; 114 int design_capacity_warning; 115 int design_capacity_low; 116 int cycle_count; 117 int measurement_accuracy; 118 int max_sampling_time; 119 int min_sampling_time; 120 int max_averaging_interval; 121 int min_averaging_interval; 122 int capacity_granularity_1; 123 int capacity_granularity_2; 124 int alarm; 125 char model_number[32]; 126 char serial_number[32]; 127 char type[32]; 128 char oem_info[32]; 129 int state; 130 int power_unit; 131 unsigned long flags; 132 }; 133 134 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat) 135 136 inline int acpi_battery_present(struct acpi_battery *battery) 137 { 138 return battery->device->status.battery_present; 139 } 140 141 static int acpi_battery_technology(struct acpi_battery *battery) 142 { 143 if (!strcasecmp("NiCd", battery->type)) 144 return POWER_SUPPLY_TECHNOLOGY_NiCd; 145 if (!strcasecmp("NiMH", battery->type)) 146 return POWER_SUPPLY_TECHNOLOGY_NiMH; 147 if (!strcasecmp("LION", battery->type)) 148 return POWER_SUPPLY_TECHNOLOGY_LION; 149 if (!strncasecmp("LI-ION", battery->type, 6)) 150 return POWER_SUPPLY_TECHNOLOGY_LION; 151 if (!strcasecmp("LiP", battery->type)) 152 return POWER_SUPPLY_TECHNOLOGY_LIPO; 153 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 154 } 155 156 static int acpi_battery_get_state(struct acpi_battery *battery); 157 158 static int acpi_battery_is_charged(struct acpi_battery *battery) 159 { 160 /* either charging or discharging */ 161 if (battery->state != 0) 162 return 0; 163 164 /* battery not reporting charge */ 165 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 166 battery->capacity_now == 0) 167 return 0; 168 169 /* good batteries update full_charge as the batteries degrade */ 170 if (battery->full_charge_capacity == battery->capacity_now) 171 return 1; 172 173 /* fallback to using design values for broken batteries */ 174 if (battery->design_capacity == battery->capacity_now) 175 return 1; 176 177 /* we don't do any sort of metric based on percentages */ 178 return 0; 179 } 180 181 static int acpi_battery_get_property(struct power_supply *psy, 182 enum power_supply_property psp, 183 union power_supply_propval *val) 184 { 185 int ret = 0; 186 struct acpi_battery *battery = to_acpi_battery(psy); 187 188 if (acpi_battery_present(battery)) { 189 /* run battery update only if it is present */ 190 acpi_battery_get_state(battery); 191 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 192 return -ENODEV; 193 switch (psp) { 194 case POWER_SUPPLY_PROP_STATUS: 195 if (battery->state & 0x01) 196 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 197 else if (battery->state & 0x02) 198 val->intval = POWER_SUPPLY_STATUS_CHARGING; 199 else if (acpi_battery_is_charged(battery)) 200 val->intval = POWER_SUPPLY_STATUS_FULL; 201 else 202 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 203 break; 204 case POWER_SUPPLY_PROP_PRESENT: 205 val->intval = acpi_battery_present(battery); 206 break; 207 case POWER_SUPPLY_PROP_TECHNOLOGY: 208 val->intval = acpi_battery_technology(battery); 209 break; 210 case POWER_SUPPLY_PROP_CYCLE_COUNT: 211 val->intval = battery->cycle_count; 212 break; 213 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 214 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 215 ret = -ENODEV; 216 else 217 val->intval = battery->design_voltage * 1000; 218 break; 219 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 220 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 221 ret = -ENODEV; 222 else 223 val->intval = battery->voltage_now * 1000; 224 break; 225 case POWER_SUPPLY_PROP_CURRENT_NOW: 226 case POWER_SUPPLY_PROP_POWER_NOW: 227 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 228 ret = -ENODEV; 229 else 230 val->intval = battery->rate_now * 1000; 231 break; 232 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 233 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 234 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 235 ret = -ENODEV; 236 else 237 val->intval = battery->design_capacity * 1000; 238 break; 239 case POWER_SUPPLY_PROP_CHARGE_FULL: 240 case POWER_SUPPLY_PROP_ENERGY_FULL: 241 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 242 ret = -ENODEV; 243 else 244 val->intval = battery->full_charge_capacity * 1000; 245 break; 246 case POWER_SUPPLY_PROP_CHARGE_NOW: 247 case POWER_SUPPLY_PROP_ENERGY_NOW: 248 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 249 ret = -ENODEV; 250 else 251 val->intval = battery->capacity_now * 1000; 252 break; 253 case POWER_SUPPLY_PROP_MODEL_NAME: 254 val->strval = battery->model_number; 255 break; 256 case POWER_SUPPLY_PROP_MANUFACTURER: 257 val->strval = battery->oem_info; 258 break; 259 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 260 val->strval = battery->serial_number; 261 break; 262 default: 263 ret = -EINVAL; 264 } 265 return ret; 266 } 267 268 static enum power_supply_property charge_battery_props[] = { 269 POWER_SUPPLY_PROP_STATUS, 270 POWER_SUPPLY_PROP_PRESENT, 271 POWER_SUPPLY_PROP_TECHNOLOGY, 272 POWER_SUPPLY_PROP_CYCLE_COUNT, 273 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 274 POWER_SUPPLY_PROP_VOLTAGE_NOW, 275 POWER_SUPPLY_PROP_CURRENT_NOW, 276 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 277 POWER_SUPPLY_PROP_CHARGE_FULL, 278 POWER_SUPPLY_PROP_CHARGE_NOW, 279 POWER_SUPPLY_PROP_MODEL_NAME, 280 POWER_SUPPLY_PROP_MANUFACTURER, 281 POWER_SUPPLY_PROP_SERIAL_NUMBER, 282 }; 283 284 static enum power_supply_property energy_battery_props[] = { 285 POWER_SUPPLY_PROP_STATUS, 286 POWER_SUPPLY_PROP_PRESENT, 287 POWER_SUPPLY_PROP_TECHNOLOGY, 288 POWER_SUPPLY_PROP_CYCLE_COUNT, 289 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 290 POWER_SUPPLY_PROP_VOLTAGE_NOW, 291 POWER_SUPPLY_PROP_POWER_NOW, 292 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 293 POWER_SUPPLY_PROP_ENERGY_FULL, 294 POWER_SUPPLY_PROP_ENERGY_NOW, 295 POWER_SUPPLY_PROP_MODEL_NAME, 296 POWER_SUPPLY_PROP_MANUFACTURER, 297 POWER_SUPPLY_PROP_SERIAL_NUMBER, 298 }; 299 300 #ifdef CONFIG_ACPI_PROCFS_POWER 301 inline char *acpi_battery_units(struct acpi_battery *battery) 302 { 303 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ? 304 "mA" : "mW"; 305 } 306 #endif 307 308 /* -------------------------------------------------------------------------- 309 Battery Management 310 -------------------------------------------------------------------------- */ 311 struct acpi_offsets { 312 size_t offset; /* offset inside struct acpi_sbs_battery */ 313 u8 mode; /* int or string? */ 314 }; 315 316 static struct acpi_offsets state_offsets[] = { 317 {offsetof(struct acpi_battery, state), 0}, 318 {offsetof(struct acpi_battery, rate_now), 0}, 319 {offsetof(struct acpi_battery, capacity_now), 0}, 320 {offsetof(struct acpi_battery, voltage_now), 0}, 321 }; 322 323 static struct acpi_offsets info_offsets[] = { 324 {offsetof(struct acpi_battery, power_unit), 0}, 325 {offsetof(struct acpi_battery, design_capacity), 0}, 326 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 327 {offsetof(struct acpi_battery, technology), 0}, 328 {offsetof(struct acpi_battery, design_voltage), 0}, 329 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 330 {offsetof(struct acpi_battery, design_capacity_low), 0}, 331 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 332 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 333 {offsetof(struct acpi_battery, model_number), 1}, 334 {offsetof(struct acpi_battery, serial_number), 1}, 335 {offsetof(struct acpi_battery, type), 1}, 336 {offsetof(struct acpi_battery, oem_info), 1}, 337 }; 338 339 static struct acpi_offsets extended_info_offsets[] = { 340 {offsetof(struct acpi_battery, power_unit), 0}, 341 {offsetof(struct acpi_battery, design_capacity), 0}, 342 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 343 {offsetof(struct acpi_battery, technology), 0}, 344 {offsetof(struct acpi_battery, design_voltage), 0}, 345 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 346 {offsetof(struct acpi_battery, design_capacity_low), 0}, 347 {offsetof(struct acpi_battery, cycle_count), 0}, 348 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 349 {offsetof(struct acpi_battery, max_sampling_time), 0}, 350 {offsetof(struct acpi_battery, min_sampling_time), 0}, 351 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 352 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 353 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 354 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 355 {offsetof(struct acpi_battery, model_number), 1}, 356 {offsetof(struct acpi_battery, serial_number), 1}, 357 {offsetof(struct acpi_battery, type), 1}, 358 {offsetof(struct acpi_battery, oem_info), 1}, 359 }; 360 361 static int extract_package(struct acpi_battery *battery, 362 union acpi_object *package, 363 struct acpi_offsets *offsets, int num) 364 { 365 int i; 366 union acpi_object *element; 367 if (package->type != ACPI_TYPE_PACKAGE) 368 return -EFAULT; 369 for (i = 0; i < num; ++i) { 370 if (package->package.count <= i) 371 return -EFAULT; 372 element = &package->package.elements[i]; 373 if (offsets[i].mode) { 374 u8 *ptr = (u8 *)battery + offsets[i].offset; 375 if (element->type == ACPI_TYPE_STRING || 376 element->type == ACPI_TYPE_BUFFER) 377 strncpy(ptr, element->string.pointer, 32); 378 else if (element->type == ACPI_TYPE_INTEGER) { 379 strncpy(ptr, (u8 *)&element->integer.value, 380 sizeof(u64)); 381 ptr[sizeof(u64)] = 0; 382 } else 383 *ptr = 0; /* don't have value */ 384 } else { 385 int *x = (int *)((u8 *)battery + offsets[i].offset); 386 *x = (element->type == ACPI_TYPE_INTEGER) ? 387 element->integer.value : -1; 388 } 389 } 390 return 0; 391 } 392 393 static int acpi_battery_get_status(struct acpi_battery *battery) 394 { 395 if (acpi_bus_get_status(battery->device)) { 396 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA")); 397 return -ENODEV; 398 } 399 return 0; 400 } 401 402 static int acpi_battery_get_info(struct acpi_battery *battery) 403 { 404 int result = -EFAULT; 405 acpi_status status = 0; 406 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)? 407 "_BIX" : "_BIF"; 408 409 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 410 411 if (!acpi_battery_present(battery)) 412 return 0; 413 mutex_lock(&battery->lock); 414 status = acpi_evaluate_object(battery->device->handle, name, 415 NULL, &buffer); 416 mutex_unlock(&battery->lock); 417 418 if (ACPI_FAILURE(status)) { 419 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name)); 420 return -ENODEV; 421 } 422 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)) 423 result = extract_package(battery, buffer.pointer, 424 extended_info_offsets, 425 ARRAY_SIZE(extended_info_offsets)); 426 else 427 result = extract_package(battery, buffer.pointer, 428 info_offsets, ARRAY_SIZE(info_offsets)); 429 kfree(buffer.pointer); 430 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 431 battery->full_charge_capacity = battery->design_capacity; 432 return result; 433 } 434 435 static int acpi_battery_get_state(struct acpi_battery *battery) 436 { 437 int result = 0; 438 acpi_status status = 0; 439 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 440 441 if (!acpi_battery_present(battery)) 442 return 0; 443 444 if (battery->update_time && 445 time_before(jiffies, battery->update_time + 446 msecs_to_jiffies(cache_time))) 447 return 0; 448 449 mutex_lock(&battery->lock); 450 status = acpi_evaluate_object(battery->device->handle, "_BST", 451 NULL, &buffer); 452 mutex_unlock(&battery->lock); 453 454 if (ACPI_FAILURE(status)) { 455 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST")); 456 return -ENODEV; 457 } 458 459 result = extract_package(battery, buffer.pointer, 460 state_offsets, ARRAY_SIZE(state_offsets)); 461 battery->update_time = jiffies; 462 kfree(buffer.pointer); 463 464 /* For buggy DSDTs that report negative 16-bit values for either 465 * charging or discharging current and/or report 0 as 65536 466 * due to bad math. 467 */ 468 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 469 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 470 (s16)(battery->rate_now) < 0) { 471 battery->rate_now = abs((s16)battery->rate_now); 472 printk_once(KERN_WARNING FW_BUG "battery: (dis)charge rate" 473 " invalid.\n"); 474 } 475 476 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 477 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 478 battery->capacity_now = (battery->capacity_now * 479 battery->full_charge_capacity) / 100; 480 return result; 481 } 482 483 static int acpi_battery_set_alarm(struct acpi_battery *battery) 484 { 485 acpi_status status = 0; 486 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER }; 487 struct acpi_object_list arg_list = { 1, &arg0 }; 488 489 if (!acpi_battery_present(battery) || 490 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 491 return -ENODEV; 492 493 arg0.integer.value = battery->alarm; 494 495 mutex_lock(&battery->lock); 496 status = acpi_evaluate_object(battery->device->handle, "_BTP", 497 &arg_list, NULL); 498 mutex_unlock(&battery->lock); 499 500 if (ACPI_FAILURE(status)) 501 return -ENODEV; 502 503 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm)); 504 return 0; 505 } 506 507 static int acpi_battery_init_alarm(struct acpi_battery *battery) 508 { 509 acpi_status status = AE_OK; 510 acpi_handle handle = NULL; 511 512 /* See if alarms are supported, and if so, set default */ 513 status = acpi_get_handle(battery->device->handle, "_BTP", &handle); 514 if (ACPI_FAILURE(status)) { 515 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 516 return 0; 517 } 518 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 519 if (!battery->alarm) 520 battery->alarm = battery->design_capacity_warning; 521 return acpi_battery_set_alarm(battery); 522 } 523 524 static ssize_t acpi_battery_alarm_show(struct device *dev, 525 struct device_attribute *attr, 526 char *buf) 527 { 528 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 529 return sprintf(buf, "%d\n", battery->alarm * 1000); 530 } 531 532 static ssize_t acpi_battery_alarm_store(struct device *dev, 533 struct device_attribute *attr, 534 const char *buf, size_t count) 535 { 536 unsigned long x; 537 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 538 if (sscanf(buf, "%ld\n", &x) == 1) 539 battery->alarm = x/1000; 540 if (acpi_battery_present(battery)) 541 acpi_battery_set_alarm(battery); 542 return count; 543 } 544 545 static struct device_attribute alarm_attr = { 546 .attr = {.name = "alarm", .mode = 0644}, 547 .show = acpi_battery_alarm_show, 548 .store = acpi_battery_alarm_store, 549 }; 550 551 static int sysfs_add_battery(struct acpi_battery *battery) 552 { 553 int result; 554 555 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 556 battery->bat.properties = charge_battery_props; 557 battery->bat.num_properties = 558 ARRAY_SIZE(charge_battery_props); 559 } else { 560 battery->bat.properties = energy_battery_props; 561 battery->bat.num_properties = 562 ARRAY_SIZE(energy_battery_props); 563 } 564 565 battery->bat.name = acpi_device_bid(battery->device); 566 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY; 567 battery->bat.get_property = acpi_battery_get_property; 568 569 result = power_supply_register(&battery->device->dev, &battery->bat); 570 if (result) 571 return result; 572 return device_create_file(battery->bat.dev, &alarm_attr); 573 } 574 575 static void sysfs_remove_battery(struct acpi_battery *battery) 576 { 577 mutex_lock(&battery->sysfs_lock); 578 if (!battery->bat.dev) { 579 mutex_unlock(&battery->sysfs_lock); 580 return; 581 } 582 583 device_remove_file(battery->bat.dev, &alarm_attr); 584 power_supply_unregister(&battery->bat); 585 battery->bat.dev = NULL; 586 mutex_unlock(&battery->sysfs_lock); 587 } 588 589 /* 590 * According to the ACPI spec, some kinds of primary batteries can 591 * report percentage battery remaining capacity directly to OS. 592 * In this case, it reports the Last Full Charged Capacity == 100 593 * and BatteryPresentRate == 0xFFFFFFFF. 594 * 595 * Now we found some battery reports percentage remaining capacity 596 * even if it's rechargeable. 597 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 598 * 599 * Handle this correctly so that they won't break userspace. 600 */ 601 static void acpi_battery_quirks(struct acpi_battery *battery) 602 { 603 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 604 return ; 605 606 if (battery->full_charge_capacity == 100 && 607 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 608 battery->capacity_now >=0 && battery->capacity_now <= 100) { 609 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 610 battery->full_charge_capacity = battery->design_capacity; 611 battery->capacity_now = (battery->capacity_now * 612 battery->full_charge_capacity) / 100; 613 } 614 } 615 616 static int acpi_battery_update(struct acpi_battery *battery) 617 { 618 int result, old_present = acpi_battery_present(battery); 619 result = acpi_battery_get_status(battery); 620 if (result) 621 return result; 622 if (!acpi_battery_present(battery)) { 623 sysfs_remove_battery(battery); 624 battery->update_time = 0; 625 return 0; 626 } 627 if (!battery->update_time || 628 old_present != acpi_battery_present(battery)) { 629 result = acpi_battery_get_info(battery); 630 if (result) 631 return result; 632 acpi_battery_init_alarm(battery); 633 } 634 if (!battery->bat.dev) { 635 result = sysfs_add_battery(battery); 636 if (result) 637 return result; 638 } 639 result = acpi_battery_get_state(battery); 640 acpi_battery_quirks(battery); 641 return result; 642 } 643 644 static void acpi_battery_refresh(struct acpi_battery *battery) 645 { 646 int power_unit; 647 648 if (!battery->bat.dev) 649 return; 650 651 power_unit = battery->power_unit; 652 653 acpi_battery_get_info(battery); 654 655 if (power_unit == battery->power_unit) 656 return; 657 658 /* The battery has changed its reporting units. */ 659 sysfs_remove_battery(battery); 660 sysfs_add_battery(battery); 661 } 662 663 /* -------------------------------------------------------------------------- 664 FS Interface (/proc) 665 -------------------------------------------------------------------------- */ 666 667 #ifdef CONFIG_ACPI_PROCFS_POWER 668 static struct proc_dir_entry *acpi_battery_dir; 669 670 static int acpi_battery_print_info(struct seq_file *seq, int result) 671 { 672 struct acpi_battery *battery = seq->private; 673 674 if (result) 675 goto end; 676 677 seq_printf(seq, "present: %s\n", 678 acpi_battery_present(battery)?"yes":"no"); 679 if (!acpi_battery_present(battery)) 680 goto end; 681 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 682 seq_printf(seq, "design capacity: unknown\n"); 683 else 684 seq_printf(seq, "design capacity: %d %sh\n", 685 battery->design_capacity, 686 acpi_battery_units(battery)); 687 688 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 689 seq_printf(seq, "last full capacity: unknown\n"); 690 else 691 seq_printf(seq, "last full capacity: %d %sh\n", 692 battery->full_charge_capacity, 693 acpi_battery_units(battery)); 694 695 seq_printf(seq, "battery technology: %srechargeable\n", 696 (!battery->technology)?"non-":""); 697 698 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 699 seq_printf(seq, "design voltage: unknown\n"); 700 else 701 seq_printf(seq, "design voltage: %d mV\n", 702 battery->design_voltage); 703 seq_printf(seq, "design capacity warning: %d %sh\n", 704 battery->design_capacity_warning, 705 acpi_battery_units(battery)); 706 seq_printf(seq, "design capacity low: %d %sh\n", 707 battery->design_capacity_low, 708 acpi_battery_units(battery)); 709 seq_printf(seq, "cycle count: %i\n", battery->cycle_count); 710 seq_printf(seq, "capacity granularity 1: %d %sh\n", 711 battery->capacity_granularity_1, 712 acpi_battery_units(battery)); 713 seq_printf(seq, "capacity granularity 2: %d %sh\n", 714 battery->capacity_granularity_2, 715 acpi_battery_units(battery)); 716 seq_printf(seq, "model number: %s\n", battery->model_number); 717 seq_printf(seq, "serial number: %s\n", battery->serial_number); 718 seq_printf(seq, "battery type: %s\n", battery->type); 719 seq_printf(seq, "OEM info: %s\n", battery->oem_info); 720 end: 721 if (result) 722 seq_printf(seq, "ERROR: Unable to read battery info\n"); 723 return result; 724 } 725 726 static int acpi_battery_print_state(struct seq_file *seq, int result) 727 { 728 struct acpi_battery *battery = seq->private; 729 730 if (result) 731 goto end; 732 733 seq_printf(seq, "present: %s\n", 734 acpi_battery_present(battery)?"yes":"no"); 735 if (!acpi_battery_present(battery)) 736 goto end; 737 738 seq_printf(seq, "capacity state: %s\n", 739 (battery->state & 0x04)?"critical":"ok"); 740 if ((battery->state & 0x01) && (battery->state & 0x02)) 741 seq_printf(seq, 742 "charging state: charging/discharging\n"); 743 else if (battery->state & 0x01) 744 seq_printf(seq, "charging state: discharging\n"); 745 else if (battery->state & 0x02) 746 seq_printf(seq, "charging state: charging\n"); 747 else 748 seq_printf(seq, "charging state: charged\n"); 749 750 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 751 seq_printf(seq, "present rate: unknown\n"); 752 else 753 seq_printf(seq, "present rate: %d %s\n", 754 battery->rate_now, acpi_battery_units(battery)); 755 756 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 757 seq_printf(seq, "remaining capacity: unknown\n"); 758 else 759 seq_printf(seq, "remaining capacity: %d %sh\n", 760 battery->capacity_now, acpi_battery_units(battery)); 761 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 762 seq_printf(seq, "present voltage: unknown\n"); 763 else 764 seq_printf(seq, "present voltage: %d mV\n", 765 battery->voltage_now); 766 end: 767 if (result) 768 seq_printf(seq, "ERROR: Unable to read battery state\n"); 769 770 return result; 771 } 772 773 static int acpi_battery_print_alarm(struct seq_file *seq, int result) 774 { 775 struct acpi_battery *battery = seq->private; 776 777 if (result) 778 goto end; 779 780 if (!acpi_battery_present(battery)) { 781 seq_printf(seq, "present: no\n"); 782 goto end; 783 } 784 seq_printf(seq, "alarm: "); 785 if (!battery->alarm) 786 seq_printf(seq, "unsupported\n"); 787 else 788 seq_printf(seq, "%u %sh\n", battery->alarm, 789 acpi_battery_units(battery)); 790 end: 791 if (result) 792 seq_printf(seq, "ERROR: Unable to read battery alarm\n"); 793 return result; 794 } 795 796 static ssize_t acpi_battery_write_alarm(struct file *file, 797 const char __user * buffer, 798 size_t count, loff_t * ppos) 799 { 800 int result = 0; 801 char alarm_string[12] = { '\0' }; 802 struct seq_file *m = file->private_data; 803 struct acpi_battery *battery = m->private; 804 805 if (!battery || (count > sizeof(alarm_string) - 1)) 806 return -EINVAL; 807 if (!acpi_battery_present(battery)) { 808 result = -ENODEV; 809 goto end; 810 } 811 if (copy_from_user(alarm_string, buffer, count)) { 812 result = -EFAULT; 813 goto end; 814 } 815 alarm_string[count] = '\0'; 816 battery->alarm = simple_strtol(alarm_string, NULL, 0); 817 result = acpi_battery_set_alarm(battery); 818 end: 819 if (!result) 820 return count; 821 return result; 822 } 823 824 typedef int(*print_func)(struct seq_file *seq, int result); 825 826 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = { 827 acpi_battery_print_info, 828 acpi_battery_print_state, 829 acpi_battery_print_alarm, 830 }; 831 832 static int acpi_battery_read(int fid, struct seq_file *seq) 833 { 834 struct acpi_battery *battery = seq->private; 835 int result = acpi_battery_update(battery); 836 return acpi_print_funcs[fid](seq, result); 837 } 838 839 #define DECLARE_FILE_FUNCTIONS(_name) \ 840 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \ 841 { \ 842 return acpi_battery_read(_name##_tag, seq); \ 843 } \ 844 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \ 845 { \ 846 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \ 847 } 848 849 DECLARE_FILE_FUNCTIONS(info); 850 DECLARE_FILE_FUNCTIONS(state); 851 DECLARE_FILE_FUNCTIONS(alarm); 852 853 #undef DECLARE_FILE_FUNCTIONS 854 855 #define FILE_DESCRIPTION_RO(_name) \ 856 { \ 857 .name = __stringify(_name), \ 858 .mode = S_IRUGO, \ 859 .ops = { \ 860 .open = acpi_battery_##_name##_open_fs, \ 861 .read = seq_read, \ 862 .llseek = seq_lseek, \ 863 .release = single_release, \ 864 .owner = THIS_MODULE, \ 865 }, \ 866 } 867 868 #define FILE_DESCRIPTION_RW(_name) \ 869 { \ 870 .name = __stringify(_name), \ 871 .mode = S_IFREG | S_IRUGO | S_IWUSR, \ 872 .ops = { \ 873 .open = acpi_battery_##_name##_open_fs, \ 874 .read = seq_read, \ 875 .llseek = seq_lseek, \ 876 .write = acpi_battery_write_##_name, \ 877 .release = single_release, \ 878 .owner = THIS_MODULE, \ 879 }, \ 880 } 881 882 static const struct battery_file { 883 struct file_operations ops; 884 umode_t mode; 885 const char *name; 886 } acpi_battery_file[] = { 887 FILE_DESCRIPTION_RO(info), 888 FILE_DESCRIPTION_RO(state), 889 FILE_DESCRIPTION_RW(alarm), 890 }; 891 892 #undef FILE_DESCRIPTION_RO 893 #undef FILE_DESCRIPTION_RW 894 895 static int acpi_battery_add_fs(struct acpi_device *device) 896 { 897 struct proc_dir_entry *entry = NULL; 898 int i; 899 900 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded," 901 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 902 if (!acpi_device_dir(device)) { 903 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 904 acpi_battery_dir); 905 if (!acpi_device_dir(device)) 906 return -ENODEV; 907 } 908 909 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) { 910 entry = proc_create_data(acpi_battery_file[i].name, 911 acpi_battery_file[i].mode, 912 acpi_device_dir(device), 913 &acpi_battery_file[i].ops, 914 acpi_driver_data(device)); 915 if (!entry) 916 return -ENODEV; 917 } 918 return 0; 919 } 920 921 static void acpi_battery_remove_fs(struct acpi_device *device) 922 { 923 int i; 924 if (!acpi_device_dir(device)) 925 return; 926 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) 927 remove_proc_entry(acpi_battery_file[i].name, 928 acpi_device_dir(device)); 929 930 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir); 931 acpi_device_dir(device) = NULL; 932 } 933 934 #endif 935 936 /* -------------------------------------------------------------------------- 937 Driver Interface 938 -------------------------------------------------------------------------- */ 939 940 static void acpi_battery_notify(struct acpi_device *device, u32 event) 941 { 942 struct acpi_battery *battery = acpi_driver_data(device); 943 struct device *old; 944 945 if (!battery) 946 return; 947 old = battery->bat.dev; 948 if (event == ACPI_BATTERY_NOTIFY_INFO) 949 acpi_battery_refresh(battery); 950 acpi_battery_update(battery); 951 acpi_bus_generate_proc_event(device, event, 952 acpi_battery_present(battery)); 953 acpi_bus_generate_netlink_event(device->pnp.device_class, 954 dev_name(&device->dev), event, 955 acpi_battery_present(battery)); 956 /* acpi_battery_update could remove power_supply object */ 957 if (old && battery->bat.dev) 958 power_supply_changed(&battery->bat); 959 } 960 961 static int battery_notify(struct notifier_block *nb, 962 unsigned long mode, void *_unused) 963 { 964 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 965 pm_nb); 966 switch (mode) { 967 case PM_POST_HIBERNATION: 968 case PM_POST_SUSPEND: 969 if (battery->bat.dev) { 970 sysfs_remove_battery(battery); 971 sysfs_add_battery(battery); 972 } 973 break; 974 } 975 976 return 0; 977 } 978 979 static int acpi_battery_add(struct acpi_device *device) 980 { 981 int result = 0; 982 struct acpi_battery *battery = NULL; 983 acpi_handle handle; 984 if (!device) 985 return -EINVAL; 986 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 987 if (!battery) 988 return -ENOMEM; 989 battery->device = device; 990 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 991 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 992 device->driver_data = battery; 993 mutex_init(&battery->lock); 994 mutex_init(&battery->sysfs_lock); 995 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle, 996 "_BIX", &handle))) 997 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 998 result = acpi_battery_update(battery); 999 if (result) 1000 goto fail; 1001 #ifdef CONFIG_ACPI_PROCFS_POWER 1002 result = acpi_battery_add_fs(device); 1003 #endif 1004 if (result) { 1005 #ifdef CONFIG_ACPI_PROCFS_POWER 1006 acpi_battery_remove_fs(device); 1007 #endif 1008 goto fail; 1009 } 1010 1011 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n", 1012 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device), 1013 device->status.battery_present ? "present" : "absent"); 1014 1015 battery->pm_nb.notifier_call = battery_notify; 1016 register_pm_notifier(&battery->pm_nb); 1017 1018 return result; 1019 1020 fail: 1021 sysfs_remove_battery(battery); 1022 mutex_destroy(&battery->lock); 1023 mutex_destroy(&battery->sysfs_lock); 1024 kfree(battery); 1025 return result; 1026 } 1027 1028 static int acpi_battery_remove(struct acpi_device *device, int type) 1029 { 1030 struct acpi_battery *battery = NULL; 1031 1032 if (!device || !acpi_driver_data(device)) 1033 return -EINVAL; 1034 battery = acpi_driver_data(device); 1035 unregister_pm_notifier(&battery->pm_nb); 1036 #ifdef CONFIG_ACPI_PROCFS_POWER 1037 acpi_battery_remove_fs(device); 1038 #endif 1039 sysfs_remove_battery(battery); 1040 mutex_destroy(&battery->lock); 1041 mutex_destroy(&battery->sysfs_lock); 1042 kfree(battery); 1043 return 0; 1044 } 1045 1046 /* this is needed to learn about changes made in suspended state */ 1047 static int acpi_battery_resume(struct acpi_device *device) 1048 { 1049 struct acpi_battery *battery; 1050 if (!device) 1051 return -EINVAL; 1052 battery = acpi_driver_data(device); 1053 battery->update_time = 0; 1054 acpi_battery_update(battery); 1055 return 0; 1056 } 1057 1058 static struct acpi_driver acpi_battery_driver = { 1059 .name = "battery", 1060 .class = ACPI_BATTERY_CLASS, 1061 .ids = battery_device_ids, 1062 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 1063 .ops = { 1064 .add = acpi_battery_add, 1065 .resume = acpi_battery_resume, 1066 .remove = acpi_battery_remove, 1067 .notify = acpi_battery_notify, 1068 }, 1069 }; 1070 1071 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1072 { 1073 if (acpi_disabled) 1074 return; 1075 #ifdef CONFIG_ACPI_PROCFS_POWER 1076 acpi_battery_dir = acpi_lock_battery_dir(); 1077 if (!acpi_battery_dir) 1078 return; 1079 #endif 1080 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) { 1081 #ifdef CONFIG_ACPI_PROCFS_POWER 1082 acpi_unlock_battery_dir(acpi_battery_dir); 1083 #endif 1084 return; 1085 } 1086 return; 1087 } 1088 1089 static int __init acpi_battery_init(void) 1090 { 1091 async_schedule(acpi_battery_init_async, NULL); 1092 return 0; 1093 } 1094 1095 static void __exit acpi_battery_exit(void) 1096 { 1097 acpi_bus_unregister_driver(&acpi_battery_driver); 1098 #ifdef CONFIG_ACPI_PROCFS_POWER 1099 acpi_unlock_battery_dir(acpi_battery_dir); 1100 #endif 1101 } 1102 1103 module_init(acpi_battery_init); 1104 module_exit(acpi_battery_exit); 1105