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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/module.h> 26 #include <linux/init.h> 27 #include <linux/types.h> 28 #include <linux/jiffies.h> 29 #include <linux/async.h> 30 #include <linux/dmi.h> 31 #include <linux/delay.h> 32 #include <linux/slab.h> 33 #include <linux/suspend.h> 34 #include <asm/unaligned.h> 35 36 #ifdef CONFIG_ACPI_PROCFS_POWER 37 #include <linux/proc_fs.h> 38 #include <linux/seq_file.h> 39 #include <linux/uaccess.h> 40 #endif 41 42 #include <linux/acpi.h> 43 #include <linux/power_supply.h> 44 45 #include "battery.h" 46 47 #define PREFIX "ACPI: " 48 49 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF 50 51 #define ACPI_BATTERY_DEVICE_NAME "Battery" 52 53 /* Battery power unit: 0 means mW, 1 means mA */ 54 #define ACPI_BATTERY_POWER_UNIT_MA 1 55 56 #define ACPI_BATTERY_STATE_DISCHARGING 0x1 57 #define ACPI_BATTERY_STATE_CHARGING 0x2 58 #define ACPI_BATTERY_STATE_CRITICAL 0x4 59 60 #define _COMPONENT ACPI_BATTERY_COMPONENT 61 62 ACPI_MODULE_NAME("battery"); 63 64 MODULE_AUTHOR("Paul Diefenbaugh"); 65 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 66 MODULE_DESCRIPTION("ACPI Battery Driver"); 67 MODULE_LICENSE("GPL"); 68 69 static async_cookie_t async_cookie; 70 static int battery_bix_broken_package; 71 static int battery_notification_delay_ms; 72 static unsigned int cache_time = 1000; 73 module_param(cache_time, uint, 0644); 74 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 75 76 #ifdef CONFIG_ACPI_PROCFS_POWER 77 extern struct proc_dir_entry *acpi_lock_battery_dir(void); 78 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir); 79 80 enum acpi_battery_files { 81 info_tag = 0, 82 state_tag, 83 alarm_tag, 84 ACPI_BATTERY_NUMFILES, 85 }; 86 87 #endif 88 89 static const struct acpi_device_id battery_device_ids[] = { 90 {"PNP0C0A", 0}, 91 {"", 0}, 92 }; 93 94 MODULE_DEVICE_TABLE(acpi, battery_device_ids); 95 96 enum { 97 ACPI_BATTERY_ALARM_PRESENT, 98 ACPI_BATTERY_XINFO_PRESENT, 99 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 100 /* On Lenovo Thinkpad models from 2010 and 2011, the power unit 101 switches between mWh and mAh depending on whether the system 102 is running on battery or not. When mAh is the unit, most 103 reported values are incorrect and need to be adjusted by 104 10000/design_voltage. Verified on x201, t410, t410s, and x220. 105 Pre-2010 and 2012 models appear to always report in mWh and 106 are thus unaffected (tested with t42, t61, t500, x200, x300, 107 and x230). Also, in mid-2012 Lenovo issued a BIOS update for 108 the 2011 models that fixes the issue (tested on x220 with a 109 post-1.29 BIOS), but as of Nov. 2012, no such update is 110 available for the 2010 models. */ 111 ACPI_BATTERY_QUIRK_THINKPAD_MAH, 112 }; 113 114 struct acpi_battery { 115 struct mutex lock; 116 struct mutex sysfs_lock; 117 struct power_supply *bat; 118 struct power_supply_desc bat_desc; 119 struct acpi_device *device; 120 struct notifier_block pm_nb; 121 unsigned long update_time; 122 int revision; 123 int rate_now; 124 int capacity_now; 125 int voltage_now; 126 int design_capacity; 127 int full_charge_capacity; 128 int technology; 129 int design_voltage; 130 int design_capacity_warning; 131 int design_capacity_low; 132 int cycle_count; 133 int measurement_accuracy; 134 int max_sampling_time; 135 int min_sampling_time; 136 int max_averaging_interval; 137 int min_averaging_interval; 138 int capacity_granularity_1; 139 int capacity_granularity_2; 140 int alarm; 141 char model_number[32]; 142 char serial_number[32]; 143 char type[32]; 144 char oem_info[32]; 145 int state; 146 int power_unit; 147 unsigned long flags; 148 }; 149 150 #define to_acpi_battery(x) power_supply_get_drvdata(x) 151 152 static inline int acpi_battery_present(struct acpi_battery *battery) 153 { 154 return battery->device->status.battery_present; 155 } 156 157 static int acpi_battery_technology(struct acpi_battery *battery) 158 { 159 if (!strcasecmp("NiCd", battery->type)) 160 return POWER_SUPPLY_TECHNOLOGY_NiCd; 161 if (!strcasecmp("NiMH", battery->type)) 162 return POWER_SUPPLY_TECHNOLOGY_NiMH; 163 if (!strcasecmp("LION", battery->type)) 164 return POWER_SUPPLY_TECHNOLOGY_LION; 165 if (!strncasecmp("LI-ION", battery->type, 6)) 166 return POWER_SUPPLY_TECHNOLOGY_LION; 167 if (!strcasecmp("LiP", battery->type)) 168 return POWER_SUPPLY_TECHNOLOGY_LIPO; 169 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 170 } 171 172 static int acpi_battery_get_state(struct acpi_battery *battery); 173 174 static int acpi_battery_is_charged(struct acpi_battery *battery) 175 { 176 /* charging, discharging or critical low */ 177 if (battery->state != 0) 178 return 0; 179 180 /* battery not reporting charge */ 181 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 182 battery->capacity_now == 0) 183 return 0; 184 185 /* good batteries update full_charge as the batteries degrade */ 186 if (battery->full_charge_capacity == battery->capacity_now) 187 return 1; 188 189 /* fallback to using design values for broken batteries */ 190 if (battery->design_capacity == battery->capacity_now) 191 return 1; 192 193 /* we don't do any sort of metric based on percentages */ 194 return 0; 195 } 196 197 static int acpi_battery_get_property(struct power_supply *psy, 198 enum power_supply_property psp, 199 union power_supply_propval *val) 200 { 201 int ret = 0; 202 struct acpi_battery *battery = to_acpi_battery(psy); 203 204 if (acpi_battery_present(battery)) { 205 /* run battery update only if it is present */ 206 acpi_battery_get_state(battery); 207 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 208 return -ENODEV; 209 switch (psp) { 210 case POWER_SUPPLY_PROP_STATUS: 211 if (battery->state & ACPI_BATTERY_STATE_DISCHARGING) 212 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 213 else if (battery->state & ACPI_BATTERY_STATE_CHARGING) 214 val->intval = POWER_SUPPLY_STATUS_CHARGING; 215 else if (acpi_battery_is_charged(battery)) 216 val->intval = POWER_SUPPLY_STATUS_FULL; 217 else 218 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 219 break; 220 case POWER_SUPPLY_PROP_PRESENT: 221 val->intval = acpi_battery_present(battery); 222 break; 223 case POWER_SUPPLY_PROP_TECHNOLOGY: 224 val->intval = acpi_battery_technology(battery); 225 break; 226 case POWER_SUPPLY_PROP_CYCLE_COUNT: 227 val->intval = battery->cycle_count; 228 break; 229 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 230 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 231 ret = -ENODEV; 232 else 233 val->intval = battery->design_voltage * 1000; 234 break; 235 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 236 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 237 ret = -ENODEV; 238 else 239 val->intval = battery->voltage_now * 1000; 240 break; 241 case POWER_SUPPLY_PROP_CURRENT_NOW: 242 case POWER_SUPPLY_PROP_POWER_NOW: 243 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 244 ret = -ENODEV; 245 else 246 val->intval = battery->rate_now * 1000; 247 break; 248 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 249 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 250 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 251 ret = -ENODEV; 252 else 253 val->intval = battery->design_capacity * 1000; 254 break; 255 case POWER_SUPPLY_PROP_CHARGE_FULL: 256 case POWER_SUPPLY_PROP_ENERGY_FULL: 257 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 258 ret = -ENODEV; 259 else 260 val->intval = battery->full_charge_capacity * 1000; 261 break; 262 case POWER_SUPPLY_PROP_CHARGE_NOW: 263 case POWER_SUPPLY_PROP_ENERGY_NOW: 264 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 265 ret = -ENODEV; 266 else 267 val->intval = battery->capacity_now * 1000; 268 break; 269 case POWER_SUPPLY_PROP_CAPACITY: 270 if (battery->capacity_now && battery->full_charge_capacity) 271 val->intval = battery->capacity_now * 100/ 272 battery->full_charge_capacity; 273 else 274 val->intval = 0; 275 break; 276 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 277 if (battery->state & ACPI_BATTERY_STATE_CRITICAL) 278 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL; 279 else if (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 280 (battery->capacity_now <= battery->alarm)) 281 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 282 else if (acpi_battery_is_charged(battery)) 283 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 284 else 285 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 286 break; 287 case POWER_SUPPLY_PROP_MODEL_NAME: 288 val->strval = battery->model_number; 289 break; 290 case POWER_SUPPLY_PROP_MANUFACTURER: 291 val->strval = battery->oem_info; 292 break; 293 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 294 val->strval = battery->serial_number; 295 break; 296 default: 297 ret = -EINVAL; 298 } 299 return ret; 300 } 301 302 static enum power_supply_property charge_battery_props[] = { 303 POWER_SUPPLY_PROP_STATUS, 304 POWER_SUPPLY_PROP_PRESENT, 305 POWER_SUPPLY_PROP_TECHNOLOGY, 306 POWER_SUPPLY_PROP_CYCLE_COUNT, 307 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 308 POWER_SUPPLY_PROP_VOLTAGE_NOW, 309 POWER_SUPPLY_PROP_CURRENT_NOW, 310 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 311 POWER_SUPPLY_PROP_CHARGE_FULL, 312 POWER_SUPPLY_PROP_CHARGE_NOW, 313 POWER_SUPPLY_PROP_CAPACITY, 314 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 315 POWER_SUPPLY_PROP_MODEL_NAME, 316 POWER_SUPPLY_PROP_MANUFACTURER, 317 POWER_SUPPLY_PROP_SERIAL_NUMBER, 318 }; 319 320 static enum power_supply_property energy_battery_props[] = { 321 POWER_SUPPLY_PROP_STATUS, 322 POWER_SUPPLY_PROP_PRESENT, 323 POWER_SUPPLY_PROP_TECHNOLOGY, 324 POWER_SUPPLY_PROP_CYCLE_COUNT, 325 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 326 POWER_SUPPLY_PROP_VOLTAGE_NOW, 327 POWER_SUPPLY_PROP_POWER_NOW, 328 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 329 POWER_SUPPLY_PROP_ENERGY_FULL, 330 POWER_SUPPLY_PROP_ENERGY_NOW, 331 POWER_SUPPLY_PROP_CAPACITY, 332 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 333 POWER_SUPPLY_PROP_MODEL_NAME, 334 POWER_SUPPLY_PROP_MANUFACTURER, 335 POWER_SUPPLY_PROP_SERIAL_NUMBER, 336 }; 337 338 /* -------------------------------------------------------------------------- 339 Battery Management 340 -------------------------------------------------------------------------- */ 341 struct acpi_offsets { 342 size_t offset; /* offset inside struct acpi_sbs_battery */ 343 u8 mode; /* int or string? */ 344 }; 345 346 static const struct acpi_offsets state_offsets[] = { 347 {offsetof(struct acpi_battery, state), 0}, 348 {offsetof(struct acpi_battery, rate_now), 0}, 349 {offsetof(struct acpi_battery, capacity_now), 0}, 350 {offsetof(struct acpi_battery, voltage_now), 0}, 351 }; 352 353 static const struct acpi_offsets info_offsets[] = { 354 {offsetof(struct acpi_battery, power_unit), 0}, 355 {offsetof(struct acpi_battery, design_capacity), 0}, 356 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 357 {offsetof(struct acpi_battery, technology), 0}, 358 {offsetof(struct acpi_battery, design_voltage), 0}, 359 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 360 {offsetof(struct acpi_battery, design_capacity_low), 0}, 361 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 362 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 363 {offsetof(struct acpi_battery, model_number), 1}, 364 {offsetof(struct acpi_battery, serial_number), 1}, 365 {offsetof(struct acpi_battery, type), 1}, 366 {offsetof(struct acpi_battery, oem_info), 1}, 367 }; 368 369 static const struct acpi_offsets extended_info_offsets[] = { 370 {offsetof(struct acpi_battery, revision), 0}, 371 {offsetof(struct acpi_battery, power_unit), 0}, 372 {offsetof(struct acpi_battery, design_capacity), 0}, 373 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 374 {offsetof(struct acpi_battery, technology), 0}, 375 {offsetof(struct acpi_battery, design_voltage), 0}, 376 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 377 {offsetof(struct acpi_battery, design_capacity_low), 0}, 378 {offsetof(struct acpi_battery, cycle_count), 0}, 379 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 380 {offsetof(struct acpi_battery, max_sampling_time), 0}, 381 {offsetof(struct acpi_battery, min_sampling_time), 0}, 382 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 383 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 384 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 385 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 386 {offsetof(struct acpi_battery, model_number), 1}, 387 {offsetof(struct acpi_battery, serial_number), 1}, 388 {offsetof(struct acpi_battery, type), 1}, 389 {offsetof(struct acpi_battery, oem_info), 1}, 390 }; 391 392 static int extract_package(struct acpi_battery *battery, 393 union acpi_object *package, 394 const struct acpi_offsets *offsets, int num) 395 { 396 int i; 397 union acpi_object *element; 398 if (package->type != ACPI_TYPE_PACKAGE) 399 return -EFAULT; 400 for (i = 0; i < num; ++i) { 401 if (package->package.count <= i) 402 return -EFAULT; 403 element = &package->package.elements[i]; 404 if (offsets[i].mode) { 405 u8 *ptr = (u8 *)battery + offsets[i].offset; 406 if (element->type == ACPI_TYPE_STRING || 407 element->type == ACPI_TYPE_BUFFER) 408 strncpy(ptr, element->string.pointer, 32); 409 else if (element->type == ACPI_TYPE_INTEGER) { 410 strncpy(ptr, (u8 *)&element->integer.value, 411 sizeof(u64)); 412 ptr[sizeof(u64)] = 0; 413 } else 414 *ptr = 0; /* don't have value */ 415 } else { 416 int *x = (int *)((u8 *)battery + offsets[i].offset); 417 *x = (element->type == ACPI_TYPE_INTEGER) ? 418 element->integer.value : -1; 419 } 420 } 421 return 0; 422 } 423 424 static int acpi_battery_get_status(struct acpi_battery *battery) 425 { 426 if (acpi_bus_get_status(battery->device)) { 427 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA")); 428 return -ENODEV; 429 } 430 return 0; 431 } 432 433 434 static int extract_battery_info(const int use_bix, 435 struct acpi_battery *battery, 436 const struct acpi_buffer *buffer) 437 { 438 int result = -EFAULT; 439 440 if (use_bix && battery_bix_broken_package) 441 result = extract_package(battery, buffer->pointer, 442 extended_info_offsets + 1, 443 ARRAY_SIZE(extended_info_offsets) - 1); 444 else if (use_bix) 445 result = extract_package(battery, buffer->pointer, 446 extended_info_offsets, 447 ARRAY_SIZE(extended_info_offsets)); 448 else 449 result = extract_package(battery, buffer->pointer, 450 info_offsets, ARRAY_SIZE(info_offsets)); 451 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 452 battery->full_charge_capacity = battery->design_capacity; 453 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 454 battery->power_unit && battery->design_voltage) { 455 battery->design_capacity = battery->design_capacity * 456 10000 / battery->design_voltage; 457 battery->full_charge_capacity = battery->full_charge_capacity * 458 10000 / battery->design_voltage; 459 battery->design_capacity_warning = 460 battery->design_capacity_warning * 461 10000 / battery->design_voltage; 462 /* Curiously, design_capacity_low, unlike the rest of them, 463 is correct. */ 464 /* capacity_granularity_* equal 1 on the systems tested, so 465 it's impossible to tell if they would need an adjustment 466 or not if their values were higher. */ 467 } 468 return result; 469 } 470 471 static int acpi_battery_get_info(struct acpi_battery *battery) 472 { 473 const int xinfo = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 474 int use_bix; 475 int result = -ENODEV; 476 477 if (!acpi_battery_present(battery)) 478 return 0; 479 480 481 for (use_bix = xinfo ? 1 : 0; use_bix >= 0; use_bix--) { 482 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 483 acpi_status status = AE_ERROR; 484 485 mutex_lock(&battery->lock); 486 status = acpi_evaluate_object(battery->device->handle, 487 use_bix ? "_BIX":"_BIF", 488 NULL, &buffer); 489 mutex_unlock(&battery->lock); 490 491 if (ACPI_FAILURE(status)) { 492 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", 493 use_bix ? "_BIX":"_BIF")); 494 } else { 495 result = extract_battery_info(use_bix, 496 battery, 497 &buffer); 498 499 kfree(buffer.pointer); 500 break; 501 } 502 } 503 504 if (!result && !use_bix && xinfo) 505 pr_warn(FW_BUG "The _BIX method is broken, using _BIF.\n"); 506 507 return result; 508 } 509 510 static int acpi_battery_get_state(struct acpi_battery *battery) 511 { 512 int result = 0; 513 acpi_status status = 0; 514 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 515 516 if (!acpi_battery_present(battery)) 517 return 0; 518 519 if (battery->update_time && 520 time_before(jiffies, battery->update_time + 521 msecs_to_jiffies(cache_time))) 522 return 0; 523 524 mutex_lock(&battery->lock); 525 status = acpi_evaluate_object(battery->device->handle, "_BST", 526 NULL, &buffer); 527 mutex_unlock(&battery->lock); 528 529 if (ACPI_FAILURE(status)) { 530 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST")); 531 return -ENODEV; 532 } 533 534 result = extract_package(battery, buffer.pointer, 535 state_offsets, ARRAY_SIZE(state_offsets)); 536 battery->update_time = jiffies; 537 kfree(buffer.pointer); 538 539 /* For buggy DSDTs that report negative 16-bit values for either 540 * charging or discharging current and/or report 0 as 65536 541 * due to bad math. 542 */ 543 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA && 544 battery->rate_now != ACPI_BATTERY_VALUE_UNKNOWN && 545 (s16)(battery->rate_now) < 0) { 546 battery->rate_now = abs((s16)battery->rate_now); 547 printk_once(KERN_WARNING FW_BUG 548 "battery: (dis)charge rate invalid.\n"); 549 } 550 551 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 552 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 553 battery->capacity_now = (battery->capacity_now * 554 battery->full_charge_capacity) / 100; 555 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags) && 556 battery->power_unit && battery->design_voltage) { 557 battery->capacity_now = battery->capacity_now * 558 10000 / battery->design_voltage; 559 } 560 return result; 561 } 562 563 static int acpi_battery_set_alarm(struct acpi_battery *battery) 564 { 565 acpi_status status = 0; 566 567 if (!acpi_battery_present(battery) || 568 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 569 return -ENODEV; 570 571 mutex_lock(&battery->lock); 572 status = acpi_execute_simple_method(battery->device->handle, "_BTP", 573 battery->alarm); 574 mutex_unlock(&battery->lock); 575 576 if (ACPI_FAILURE(status)) 577 return -ENODEV; 578 579 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm)); 580 return 0; 581 } 582 583 static int acpi_battery_init_alarm(struct acpi_battery *battery) 584 { 585 /* See if alarms are supported, and if so, set default */ 586 if (!acpi_has_method(battery->device->handle, "_BTP")) { 587 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 588 return 0; 589 } 590 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 591 if (!battery->alarm) 592 battery->alarm = battery->design_capacity_warning; 593 return acpi_battery_set_alarm(battery); 594 } 595 596 static ssize_t acpi_battery_alarm_show(struct device *dev, 597 struct device_attribute *attr, 598 char *buf) 599 { 600 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 601 return sprintf(buf, "%d\n", battery->alarm * 1000); 602 } 603 604 static ssize_t acpi_battery_alarm_store(struct device *dev, 605 struct device_attribute *attr, 606 const char *buf, size_t count) 607 { 608 unsigned long x; 609 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 610 if (sscanf(buf, "%lu\n", &x) == 1) 611 battery->alarm = x/1000; 612 if (acpi_battery_present(battery)) 613 acpi_battery_set_alarm(battery); 614 return count; 615 } 616 617 static struct device_attribute alarm_attr = { 618 .attr = {.name = "alarm", .mode = 0644}, 619 .show = acpi_battery_alarm_show, 620 .store = acpi_battery_alarm_store, 621 }; 622 623 static int sysfs_add_battery(struct acpi_battery *battery) 624 { 625 struct power_supply_config psy_cfg = { .drv_data = battery, }; 626 627 if (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) { 628 battery->bat_desc.properties = charge_battery_props; 629 battery->bat_desc.num_properties = 630 ARRAY_SIZE(charge_battery_props); 631 } else { 632 battery->bat_desc.properties = energy_battery_props; 633 battery->bat_desc.num_properties = 634 ARRAY_SIZE(energy_battery_props); 635 } 636 637 battery->bat_desc.name = acpi_device_bid(battery->device); 638 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 639 battery->bat_desc.get_property = acpi_battery_get_property; 640 641 battery->bat = power_supply_register_no_ws(&battery->device->dev, 642 &battery->bat_desc, &psy_cfg); 643 644 if (IS_ERR(battery->bat)) { 645 int result = PTR_ERR(battery->bat); 646 647 battery->bat = NULL; 648 return result; 649 } 650 return device_create_file(&battery->bat->dev, &alarm_attr); 651 } 652 653 static void sysfs_remove_battery(struct acpi_battery *battery) 654 { 655 mutex_lock(&battery->sysfs_lock); 656 if (!battery->bat) { 657 mutex_unlock(&battery->sysfs_lock); 658 return; 659 } 660 661 device_remove_file(&battery->bat->dev, &alarm_attr); 662 power_supply_unregister(battery->bat); 663 battery->bat = NULL; 664 mutex_unlock(&battery->sysfs_lock); 665 } 666 667 static void find_battery(const struct dmi_header *dm, void *private) 668 { 669 struct acpi_battery *battery = (struct acpi_battery *)private; 670 /* Note: the hardcoded offsets below have been extracted from 671 the source code of dmidecode. */ 672 if (dm->type == DMI_ENTRY_PORTABLE_BATTERY && dm->length >= 8) { 673 const u8 *dmi_data = (const u8 *)(dm + 1); 674 int dmi_capacity = get_unaligned((const u16 *)(dmi_data + 6)); 675 if (dm->length >= 18) 676 dmi_capacity *= dmi_data[17]; 677 if (battery->design_capacity * battery->design_voltage / 1000 678 != dmi_capacity && 679 battery->design_capacity * 10 == dmi_capacity) 680 set_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 681 &battery->flags); 682 } 683 } 684 685 /* 686 * According to the ACPI spec, some kinds of primary batteries can 687 * report percentage battery remaining capacity directly to OS. 688 * In this case, it reports the Last Full Charged Capacity == 100 689 * and BatteryPresentRate == 0xFFFFFFFF. 690 * 691 * Now we found some battery reports percentage remaining capacity 692 * even if it's rechargeable. 693 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 694 * 695 * Handle this correctly so that they won't break userspace. 696 */ 697 static void acpi_battery_quirks(struct acpi_battery *battery) 698 { 699 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 700 return; 701 702 if (battery->full_charge_capacity == 100 && 703 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 704 battery->capacity_now >= 0 && battery->capacity_now <= 100) { 705 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 706 battery->full_charge_capacity = battery->design_capacity; 707 battery->capacity_now = (battery->capacity_now * 708 battery->full_charge_capacity) / 100; 709 } 710 711 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, &battery->flags)) 712 return; 713 714 if (battery->power_unit && dmi_name_in_vendors("LENOVO")) { 715 const char *s; 716 s = dmi_get_system_info(DMI_PRODUCT_VERSION); 717 if (s && !strncasecmp(s, "ThinkPad", 8)) { 718 dmi_walk(find_battery, battery); 719 if (test_bit(ACPI_BATTERY_QUIRK_THINKPAD_MAH, 720 &battery->flags) && 721 battery->design_voltage) { 722 battery->design_capacity = 723 battery->design_capacity * 724 10000 / battery->design_voltage; 725 battery->full_charge_capacity = 726 battery->full_charge_capacity * 727 10000 / battery->design_voltage; 728 battery->design_capacity_warning = 729 battery->design_capacity_warning * 730 10000 / battery->design_voltage; 731 battery->capacity_now = battery->capacity_now * 732 10000 / battery->design_voltage; 733 } 734 } 735 } 736 } 737 738 static int acpi_battery_update(struct acpi_battery *battery, bool resume) 739 { 740 int result, old_present = acpi_battery_present(battery); 741 result = acpi_battery_get_status(battery); 742 if (result) 743 return result; 744 if (!acpi_battery_present(battery)) { 745 sysfs_remove_battery(battery); 746 battery->update_time = 0; 747 return 0; 748 } 749 750 if (resume) 751 return 0; 752 753 if (!battery->update_time || 754 old_present != acpi_battery_present(battery)) { 755 result = acpi_battery_get_info(battery); 756 if (result) 757 return result; 758 acpi_battery_init_alarm(battery); 759 } 760 761 result = acpi_battery_get_state(battery); 762 if (result) 763 return result; 764 acpi_battery_quirks(battery); 765 766 if (!battery->bat) { 767 result = sysfs_add_battery(battery); 768 if (result) 769 return result; 770 } 771 772 /* 773 * Wakeup the system if battery is critical low 774 * or lower than the alarm level 775 */ 776 if ((battery->state & ACPI_BATTERY_STATE_CRITICAL) || 777 (test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags) && 778 (battery->capacity_now <= battery->alarm))) 779 pm_wakeup_event(&battery->device->dev, 0); 780 781 return result; 782 } 783 784 static void acpi_battery_refresh(struct acpi_battery *battery) 785 { 786 int power_unit; 787 788 if (!battery->bat) 789 return; 790 791 power_unit = battery->power_unit; 792 793 acpi_battery_get_info(battery); 794 795 if (power_unit == battery->power_unit) 796 return; 797 798 /* The battery has changed its reporting units. */ 799 sysfs_remove_battery(battery); 800 sysfs_add_battery(battery); 801 } 802 803 /* -------------------------------------------------------------------------- 804 FS Interface (/proc) 805 -------------------------------------------------------------------------- */ 806 807 #ifdef CONFIG_ACPI_PROCFS_POWER 808 static struct proc_dir_entry *acpi_battery_dir; 809 810 static const char *acpi_battery_units(const struct acpi_battery *battery) 811 { 812 return (battery->power_unit == ACPI_BATTERY_POWER_UNIT_MA) ? 813 "mA" : "mW"; 814 } 815 816 static int acpi_battery_print_info(struct seq_file *seq, int result) 817 { 818 struct acpi_battery *battery = seq->private; 819 820 if (result) 821 goto end; 822 823 seq_printf(seq, "present: %s\n", 824 acpi_battery_present(battery) ? "yes" : "no"); 825 if (!acpi_battery_present(battery)) 826 goto end; 827 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 828 seq_printf(seq, "design capacity: unknown\n"); 829 else 830 seq_printf(seq, "design capacity: %d %sh\n", 831 battery->design_capacity, 832 acpi_battery_units(battery)); 833 834 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 835 seq_printf(seq, "last full capacity: unknown\n"); 836 else 837 seq_printf(seq, "last full capacity: %d %sh\n", 838 battery->full_charge_capacity, 839 acpi_battery_units(battery)); 840 841 seq_printf(seq, "battery technology: %srechargeable\n", 842 (!battery->technology)?"non-":""); 843 844 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 845 seq_printf(seq, "design voltage: unknown\n"); 846 else 847 seq_printf(seq, "design voltage: %d mV\n", 848 battery->design_voltage); 849 seq_printf(seq, "design capacity warning: %d %sh\n", 850 battery->design_capacity_warning, 851 acpi_battery_units(battery)); 852 seq_printf(seq, "design capacity low: %d %sh\n", 853 battery->design_capacity_low, 854 acpi_battery_units(battery)); 855 seq_printf(seq, "cycle count: %i\n", battery->cycle_count); 856 seq_printf(seq, "capacity granularity 1: %d %sh\n", 857 battery->capacity_granularity_1, 858 acpi_battery_units(battery)); 859 seq_printf(seq, "capacity granularity 2: %d %sh\n", 860 battery->capacity_granularity_2, 861 acpi_battery_units(battery)); 862 seq_printf(seq, "model number: %s\n", battery->model_number); 863 seq_printf(seq, "serial number: %s\n", battery->serial_number); 864 seq_printf(seq, "battery type: %s\n", battery->type); 865 seq_printf(seq, "OEM info: %s\n", battery->oem_info); 866 end: 867 if (result) 868 seq_printf(seq, "ERROR: Unable to read battery info\n"); 869 return result; 870 } 871 872 static int acpi_battery_print_state(struct seq_file *seq, int result) 873 { 874 struct acpi_battery *battery = seq->private; 875 876 if (result) 877 goto end; 878 879 seq_printf(seq, "present: %s\n", 880 acpi_battery_present(battery) ? "yes" : "no"); 881 if (!acpi_battery_present(battery)) 882 goto end; 883 884 seq_printf(seq, "capacity state: %s\n", 885 (battery->state & 0x04) ? "critical" : "ok"); 886 if ((battery->state & 0x01) && (battery->state & 0x02)) 887 seq_printf(seq, 888 "charging state: charging/discharging\n"); 889 else if (battery->state & 0x01) 890 seq_printf(seq, "charging state: discharging\n"); 891 else if (battery->state & 0x02) 892 seq_printf(seq, "charging state: charging\n"); 893 else 894 seq_printf(seq, "charging state: charged\n"); 895 896 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 897 seq_printf(seq, "present rate: unknown\n"); 898 else 899 seq_printf(seq, "present rate: %d %s\n", 900 battery->rate_now, acpi_battery_units(battery)); 901 902 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 903 seq_printf(seq, "remaining capacity: unknown\n"); 904 else 905 seq_printf(seq, "remaining capacity: %d %sh\n", 906 battery->capacity_now, acpi_battery_units(battery)); 907 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 908 seq_printf(seq, "present voltage: unknown\n"); 909 else 910 seq_printf(seq, "present voltage: %d mV\n", 911 battery->voltage_now); 912 end: 913 if (result) 914 seq_printf(seq, "ERROR: Unable to read battery state\n"); 915 916 return result; 917 } 918 919 static int acpi_battery_print_alarm(struct seq_file *seq, int result) 920 { 921 struct acpi_battery *battery = seq->private; 922 923 if (result) 924 goto end; 925 926 if (!acpi_battery_present(battery)) { 927 seq_printf(seq, "present: no\n"); 928 goto end; 929 } 930 seq_printf(seq, "alarm: "); 931 if (!battery->alarm) 932 seq_printf(seq, "unsupported\n"); 933 else 934 seq_printf(seq, "%u %sh\n", battery->alarm, 935 acpi_battery_units(battery)); 936 end: 937 if (result) 938 seq_printf(seq, "ERROR: Unable to read battery alarm\n"); 939 return result; 940 } 941 942 static ssize_t acpi_battery_write_alarm(struct file *file, 943 const char __user * buffer, 944 size_t count, loff_t * ppos) 945 { 946 int result = 0; 947 char alarm_string[12] = { '\0' }; 948 struct seq_file *m = file->private_data; 949 struct acpi_battery *battery = m->private; 950 951 if (!battery || (count > sizeof(alarm_string) - 1)) 952 return -EINVAL; 953 if (!acpi_battery_present(battery)) { 954 result = -ENODEV; 955 goto end; 956 } 957 if (copy_from_user(alarm_string, buffer, count)) { 958 result = -EFAULT; 959 goto end; 960 } 961 alarm_string[count] = '\0'; 962 if (kstrtoint(alarm_string, 0, &battery->alarm)) { 963 result = -EINVAL; 964 goto end; 965 } 966 result = acpi_battery_set_alarm(battery); 967 end: 968 if (!result) 969 return count; 970 return result; 971 } 972 973 typedef int(*print_func)(struct seq_file *seq, int result); 974 975 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = { 976 acpi_battery_print_info, 977 acpi_battery_print_state, 978 acpi_battery_print_alarm, 979 }; 980 981 static int acpi_battery_read(int fid, struct seq_file *seq) 982 { 983 struct acpi_battery *battery = seq->private; 984 int result = acpi_battery_update(battery, false); 985 return acpi_print_funcs[fid](seq, result); 986 } 987 988 #define DECLARE_FILE_FUNCTIONS(_name) \ 989 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \ 990 { \ 991 return acpi_battery_read(_name##_tag, seq); \ 992 } \ 993 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \ 994 { \ 995 return single_open(file, acpi_battery_read_##_name, PDE_DATA(inode)); \ 996 } 997 998 DECLARE_FILE_FUNCTIONS(info); 999 DECLARE_FILE_FUNCTIONS(state); 1000 DECLARE_FILE_FUNCTIONS(alarm); 1001 1002 #undef DECLARE_FILE_FUNCTIONS 1003 1004 #define FILE_DESCRIPTION_RO(_name) \ 1005 { \ 1006 .name = __stringify(_name), \ 1007 .mode = S_IRUGO, \ 1008 .ops = { \ 1009 .open = acpi_battery_##_name##_open_fs, \ 1010 .read = seq_read, \ 1011 .llseek = seq_lseek, \ 1012 .release = single_release, \ 1013 .owner = THIS_MODULE, \ 1014 }, \ 1015 } 1016 1017 #define FILE_DESCRIPTION_RW(_name) \ 1018 { \ 1019 .name = __stringify(_name), \ 1020 .mode = S_IFREG | S_IRUGO | S_IWUSR, \ 1021 .ops = { \ 1022 .open = acpi_battery_##_name##_open_fs, \ 1023 .read = seq_read, \ 1024 .llseek = seq_lseek, \ 1025 .write = acpi_battery_write_##_name, \ 1026 .release = single_release, \ 1027 .owner = THIS_MODULE, \ 1028 }, \ 1029 } 1030 1031 static const struct battery_file { 1032 struct file_operations ops; 1033 umode_t mode; 1034 const char *name; 1035 } acpi_battery_file[] = { 1036 FILE_DESCRIPTION_RO(info), 1037 FILE_DESCRIPTION_RO(state), 1038 FILE_DESCRIPTION_RW(alarm), 1039 }; 1040 1041 #undef FILE_DESCRIPTION_RO 1042 #undef FILE_DESCRIPTION_RW 1043 1044 static int acpi_battery_add_fs(struct acpi_device *device) 1045 { 1046 struct proc_dir_entry *entry = NULL; 1047 int i; 1048 1049 printk(KERN_WARNING PREFIX "Deprecated procfs I/F for battery is loaded," 1050 " please retry with CONFIG_ACPI_PROCFS_POWER cleared\n"); 1051 if (!acpi_device_dir(device)) { 1052 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 1053 acpi_battery_dir); 1054 if (!acpi_device_dir(device)) 1055 return -ENODEV; 1056 } 1057 1058 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) { 1059 entry = proc_create_data(acpi_battery_file[i].name, 1060 acpi_battery_file[i].mode, 1061 acpi_device_dir(device), 1062 &acpi_battery_file[i].ops, 1063 acpi_driver_data(device)); 1064 if (!entry) 1065 return -ENODEV; 1066 } 1067 return 0; 1068 } 1069 1070 static void acpi_battery_remove_fs(struct acpi_device *device) 1071 { 1072 int i; 1073 if (!acpi_device_dir(device)) 1074 return; 1075 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) 1076 remove_proc_entry(acpi_battery_file[i].name, 1077 acpi_device_dir(device)); 1078 1079 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir); 1080 acpi_device_dir(device) = NULL; 1081 } 1082 1083 #endif 1084 1085 /* -------------------------------------------------------------------------- 1086 Driver Interface 1087 -------------------------------------------------------------------------- */ 1088 1089 static void acpi_battery_notify(struct acpi_device *device, u32 event) 1090 { 1091 struct acpi_battery *battery = acpi_driver_data(device); 1092 struct power_supply *old; 1093 1094 if (!battery) 1095 return; 1096 old = battery->bat; 1097 /* 1098 * On Acer Aspire V5-573G notifications are sometimes triggered too 1099 * early. For example, when AC is unplugged and notification is 1100 * triggered, battery state is still reported as "Full", and changes to 1101 * "Discharging" only after short delay, without any notification. 1102 */ 1103 if (battery_notification_delay_ms > 0) 1104 msleep(battery_notification_delay_ms); 1105 if (event == ACPI_BATTERY_NOTIFY_INFO) 1106 acpi_battery_refresh(battery); 1107 acpi_battery_update(battery, false); 1108 acpi_bus_generate_netlink_event(device->pnp.device_class, 1109 dev_name(&device->dev), event, 1110 acpi_battery_present(battery)); 1111 acpi_notifier_call_chain(device, event, acpi_battery_present(battery)); 1112 /* acpi_battery_update could remove power_supply object */ 1113 if (old && battery->bat) 1114 power_supply_changed(battery->bat); 1115 } 1116 1117 static int battery_notify(struct notifier_block *nb, 1118 unsigned long mode, void *_unused) 1119 { 1120 struct acpi_battery *battery = container_of(nb, struct acpi_battery, 1121 pm_nb); 1122 int result; 1123 1124 switch (mode) { 1125 case PM_POST_HIBERNATION: 1126 case PM_POST_SUSPEND: 1127 if (!acpi_battery_present(battery)) 1128 return 0; 1129 1130 if (!battery->bat) { 1131 result = acpi_battery_get_info(battery); 1132 if (result) 1133 return result; 1134 1135 result = sysfs_add_battery(battery); 1136 if (result) 1137 return result; 1138 } else 1139 acpi_battery_refresh(battery); 1140 1141 acpi_battery_init_alarm(battery); 1142 acpi_battery_get_state(battery); 1143 break; 1144 } 1145 1146 return 0; 1147 } 1148 1149 static int __init 1150 battery_bix_broken_package_quirk(const struct dmi_system_id *d) 1151 { 1152 battery_bix_broken_package = 1; 1153 return 0; 1154 } 1155 1156 static int __init 1157 battery_notification_delay_quirk(const struct dmi_system_id *d) 1158 { 1159 battery_notification_delay_ms = 1000; 1160 return 0; 1161 } 1162 1163 static const struct dmi_system_id bat_dmi_table[] __initconst = { 1164 { 1165 .callback = battery_bix_broken_package_quirk, 1166 .ident = "NEC LZ750/LS", 1167 .matches = { 1168 DMI_MATCH(DMI_SYS_VENDOR, "NEC"), 1169 DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"), 1170 }, 1171 }, 1172 { 1173 .callback = battery_notification_delay_quirk, 1174 .ident = "Acer Aspire V5-573G", 1175 .matches = { 1176 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1177 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire V5-573G"), 1178 }, 1179 }, 1180 {}, 1181 }; 1182 1183 /* 1184 * Some machines'(E,G Lenovo Z480) ECs are not stable 1185 * during boot up and this causes battery driver fails to be 1186 * probed due to failure of getting battery information 1187 * from EC sometimes. After several retries, the operation 1188 * may work. So add retry code here and 20ms sleep between 1189 * every retries. 1190 */ 1191 static int acpi_battery_update_retry(struct acpi_battery *battery) 1192 { 1193 int retry, ret; 1194 1195 for (retry = 5; retry; retry--) { 1196 ret = acpi_battery_update(battery, false); 1197 if (!ret) 1198 break; 1199 1200 msleep(20); 1201 } 1202 return ret; 1203 } 1204 1205 static int acpi_battery_add(struct acpi_device *device) 1206 { 1207 int result = 0; 1208 struct acpi_battery *battery = NULL; 1209 1210 if (!device) 1211 return -EINVAL; 1212 1213 if (device->dep_unmet) 1214 return -EPROBE_DEFER; 1215 1216 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 1217 if (!battery) 1218 return -ENOMEM; 1219 battery->device = device; 1220 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 1221 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 1222 device->driver_data = battery; 1223 mutex_init(&battery->lock); 1224 mutex_init(&battery->sysfs_lock); 1225 if (acpi_has_method(battery->device->handle, "_BIX")) 1226 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 1227 1228 result = acpi_battery_update_retry(battery); 1229 if (result) 1230 goto fail; 1231 1232 #ifdef CONFIG_ACPI_PROCFS_POWER 1233 result = acpi_battery_add_fs(device); 1234 #endif 1235 if (result) { 1236 #ifdef CONFIG_ACPI_PROCFS_POWER 1237 acpi_battery_remove_fs(device); 1238 #endif 1239 goto fail; 1240 } 1241 1242 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n", 1243 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device), 1244 device->status.battery_present ? "present" : "absent"); 1245 1246 battery->pm_nb.notifier_call = battery_notify; 1247 register_pm_notifier(&battery->pm_nb); 1248 1249 device_init_wakeup(&device->dev, 1); 1250 1251 return result; 1252 1253 fail: 1254 sysfs_remove_battery(battery); 1255 mutex_destroy(&battery->lock); 1256 mutex_destroy(&battery->sysfs_lock); 1257 kfree(battery); 1258 return result; 1259 } 1260 1261 static int acpi_battery_remove(struct acpi_device *device) 1262 { 1263 struct acpi_battery *battery = NULL; 1264 1265 if (!device || !acpi_driver_data(device)) 1266 return -EINVAL; 1267 device_init_wakeup(&device->dev, 0); 1268 battery = acpi_driver_data(device); 1269 unregister_pm_notifier(&battery->pm_nb); 1270 #ifdef CONFIG_ACPI_PROCFS_POWER 1271 acpi_battery_remove_fs(device); 1272 #endif 1273 sysfs_remove_battery(battery); 1274 mutex_destroy(&battery->lock); 1275 mutex_destroy(&battery->sysfs_lock); 1276 kfree(battery); 1277 return 0; 1278 } 1279 1280 #ifdef CONFIG_PM_SLEEP 1281 /* this is needed to learn about changes made in suspended state */ 1282 static int acpi_battery_resume(struct device *dev) 1283 { 1284 struct acpi_battery *battery; 1285 1286 if (!dev) 1287 return -EINVAL; 1288 1289 battery = acpi_driver_data(to_acpi_device(dev)); 1290 if (!battery) 1291 return -EINVAL; 1292 1293 battery->update_time = 0; 1294 acpi_battery_update(battery, true); 1295 return 0; 1296 } 1297 #else 1298 #define acpi_battery_resume NULL 1299 #endif 1300 1301 static SIMPLE_DEV_PM_OPS(acpi_battery_pm, NULL, acpi_battery_resume); 1302 1303 static struct acpi_driver acpi_battery_driver = { 1304 .name = "battery", 1305 .class = ACPI_BATTERY_CLASS, 1306 .ids = battery_device_ids, 1307 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 1308 .ops = { 1309 .add = acpi_battery_add, 1310 .remove = acpi_battery_remove, 1311 .notify = acpi_battery_notify, 1312 }, 1313 .drv.pm = &acpi_battery_pm, 1314 }; 1315 1316 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1317 { 1318 int result; 1319 1320 dmi_check_system(bat_dmi_table); 1321 1322 #ifdef CONFIG_ACPI_PROCFS_POWER 1323 acpi_battery_dir = acpi_lock_battery_dir(); 1324 if (!acpi_battery_dir) 1325 return; 1326 #endif 1327 result = acpi_bus_register_driver(&acpi_battery_driver); 1328 #ifdef CONFIG_ACPI_PROCFS_POWER 1329 if (result < 0) 1330 acpi_unlock_battery_dir(acpi_battery_dir); 1331 #endif 1332 } 1333 1334 static int __init acpi_battery_init(void) 1335 { 1336 if (acpi_disabled) 1337 return -ENODEV; 1338 1339 async_cookie = async_schedule(acpi_battery_init_async, NULL); 1340 return 0; 1341 } 1342 1343 static void __exit acpi_battery_exit(void) 1344 { 1345 async_synchronize_cookie(async_cookie + 1); 1346 acpi_bus_unregister_driver(&acpi_battery_driver); 1347 #ifdef CONFIG_ACPI_PROCFS_POWER 1348 acpi_unlock_battery_dir(acpi_battery_dir); 1349 #endif 1350 } 1351 1352 module_init(acpi_battery_init); 1353 module_exit(acpi_battery_exit); 1354