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 37 #ifdef CONFIG_ACPI_PROCFS_POWER 38 #include <linux/proc_fs.h> 39 #include <linux/seq_file.h> 40 #include <asm/uaccess.h> 41 #endif 42 43 #include <acpi/acpi_bus.h> 44 #include <acpi/acpi_drivers.h> 45 #include <linux/power_supply.h> 46 47 #define PREFIX "ACPI: " 48 49 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF 50 51 #define ACPI_BATTERY_CLASS "battery" 52 #define ACPI_BATTERY_DEVICE_NAME "Battery" 53 #define ACPI_BATTERY_NOTIFY_STATUS 0x80 54 #define ACPI_BATTERY_NOTIFY_INFO 0x81 55 #define ACPI_BATTERY_NOTIFY_THRESHOLD 0x82 56 57 #define _COMPONENT ACPI_BATTERY_COMPONENT 58 59 ACPI_MODULE_NAME("battery"); 60 61 MODULE_AUTHOR("Paul Diefenbaugh"); 62 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 63 MODULE_DESCRIPTION("ACPI Battery Driver"); 64 MODULE_LICENSE("GPL"); 65 66 static unsigned int cache_time = 1000; 67 module_param(cache_time, uint, 0644); 68 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 69 70 #ifdef CONFIG_ACPI_PROCFS_POWER 71 extern struct proc_dir_entry *acpi_lock_battery_dir(void); 72 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir); 73 74 enum acpi_battery_files { 75 info_tag = 0, 76 state_tag, 77 alarm_tag, 78 ACPI_BATTERY_NUMFILES, 79 }; 80 81 #endif 82 83 static const struct acpi_device_id battery_device_ids[] = { 84 {"PNP0C0A", 0}, 85 {"", 0}, 86 }; 87 88 MODULE_DEVICE_TABLE(acpi, battery_device_ids); 89 90 enum { 91 ACPI_BATTERY_ALARM_PRESENT, 92 ACPI_BATTERY_XINFO_PRESENT, 93 /* For buggy DSDTs that report negative 16-bit values for either 94 * charging or discharging current and/or report 0 as 65536 95 * due to bad math. 96 */ 97 ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, 98 ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, 99 }; 100 101 struct acpi_battery { 102 struct mutex lock; 103 struct power_supply bat; 104 struct acpi_device *device; 105 unsigned long update_time; 106 int rate_now; 107 int capacity_now; 108 int voltage_now; 109 int design_capacity; 110 int full_charge_capacity; 111 int technology; 112 int design_voltage; 113 int design_capacity_warning; 114 int design_capacity_low; 115 int cycle_count; 116 int measurement_accuracy; 117 int max_sampling_time; 118 int min_sampling_time; 119 int max_averaging_interval; 120 int min_averaging_interval; 121 int capacity_granularity_1; 122 int capacity_granularity_2; 123 int alarm; 124 char model_number[32]; 125 char serial_number[32]; 126 char type[32]; 127 char oem_info[32]; 128 int state; 129 int power_unit; 130 unsigned long flags; 131 }; 132 133 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat); 134 135 inline int acpi_battery_present(struct acpi_battery *battery) 136 { 137 return battery->device->status.battery_present; 138 } 139 140 static int acpi_battery_technology(struct acpi_battery *battery) 141 { 142 if (!strcasecmp("NiCd", battery->type)) 143 return POWER_SUPPLY_TECHNOLOGY_NiCd; 144 if (!strcasecmp("NiMH", battery->type)) 145 return POWER_SUPPLY_TECHNOLOGY_NiMH; 146 if (!strcasecmp("LION", battery->type)) 147 return POWER_SUPPLY_TECHNOLOGY_LION; 148 if (!strncasecmp("LI-ION", battery->type, 6)) 149 return POWER_SUPPLY_TECHNOLOGY_LION; 150 if (!strcasecmp("LiP", battery->type)) 151 return POWER_SUPPLY_TECHNOLOGY_LIPO; 152 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 153 } 154 155 static int acpi_battery_get_state(struct acpi_battery *battery); 156 157 static int acpi_battery_is_charged(struct acpi_battery *battery) 158 { 159 /* either charging or discharging */ 160 if (battery->state != 0) 161 return 0; 162 163 /* battery not reporting charge */ 164 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN || 165 battery->capacity_now == 0) 166 return 0; 167 168 /* good batteries update full_charge as the batteries degrade */ 169 if (battery->full_charge_capacity == battery->capacity_now) 170 return 1; 171 172 /* fallback to using design values for broken batteries */ 173 if (battery->design_capacity == battery->capacity_now) 174 return 1; 175 176 /* we don't do any sort of metric based on percentages */ 177 return 0; 178 } 179 180 static int acpi_battery_get_property(struct power_supply *psy, 181 enum power_supply_property psp, 182 union power_supply_propval *val) 183 { 184 int ret = 0; 185 struct acpi_battery *battery = to_acpi_battery(psy); 186 187 if (acpi_battery_present(battery)) { 188 /* run battery update only if it is present */ 189 acpi_battery_get_state(battery); 190 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 191 return -ENODEV; 192 switch (psp) { 193 case POWER_SUPPLY_PROP_STATUS: 194 if (battery->state & 0x01) 195 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 196 else if (battery->state & 0x02) 197 val->intval = POWER_SUPPLY_STATUS_CHARGING; 198 else if (acpi_battery_is_charged(battery)) 199 val->intval = POWER_SUPPLY_STATUS_FULL; 200 else 201 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 202 break; 203 case POWER_SUPPLY_PROP_PRESENT: 204 val->intval = acpi_battery_present(battery); 205 break; 206 case POWER_SUPPLY_PROP_TECHNOLOGY: 207 val->intval = acpi_battery_technology(battery); 208 break; 209 case POWER_SUPPLY_PROP_CYCLE_COUNT: 210 val->intval = battery->cycle_count; 211 break; 212 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 213 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 214 ret = -ENODEV; 215 else 216 val->intval = battery->design_voltage * 1000; 217 break; 218 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 219 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 220 ret = -ENODEV; 221 else 222 val->intval = battery->voltage_now * 1000; 223 break; 224 case POWER_SUPPLY_PROP_CURRENT_NOW: 225 case POWER_SUPPLY_PROP_POWER_NOW: 226 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 227 ret = -ENODEV; 228 else 229 val->intval = battery->rate_now * 1000; 230 break; 231 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 232 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 233 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 234 ret = -ENODEV; 235 else 236 val->intval = battery->design_capacity * 1000; 237 break; 238 case POWER_SUPPLY_PROP_CHARGE_FULL: 239 case POWER_SUPPLY_PROP_ENERGY_FULL: 240 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 241 ret = -ENODEV; 242 else 243 val->intval = battery->full_charge_capacity * 1000; 244 break; 245 case POWER_SUPPLY_PROP_CHARGE_NOW: 246 case POWER_SUPPLY_PROP_ENERGY_NOW: 247 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 248 ret = -ENODEV; 249 else 250 val->intval = battery->capacity_now * 1000; 251 break; 252 case POWER_SUPPLY_PROP_MODEL_NAME: 253 val->strval = battery->model_number; 254 break; 255 case POWER_SUPPLY_PROP_MANUFACTURER: 256 val->strval = battery->oem_info; 257 break; 258 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 259 val->strval = battery->serial_number; 260 break; 261 default: 262 ret = -EINVAL; 263 } 264 return ret; 265 } 266 267 static enum power_supply_property charge_battery_props[] = { 268 POWER_SUPPLY_PROP_STATUS, 269 POWER_SUPPLY_PROP_PRESENT, 270 POWER_SUPPLY_PROP_TECHNOLOGY, 271 POWER_SUPPLY_PROP_CYCLE_COUNT, 272 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 273 POWER_SUPPLY_PROP_VOLTAGE_NOW, 274 POWER_SUPPLY_PROP_CURRENT_NOW, 275 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 276 POWER_SUPPLY_PROP_CHARGE_FULL, 277 POWER_SUPPLY_PROP_CHARGE_NOW, 278 POWER_SUPPLY_PROP_MODEL_NAME, 279 POWER_SUPPLY_PROP_MANUFACTURER, 280 POWER_SUPPLY_PROP_SERIAL_NUMBER, 281 }; 282 283 static enum power_supply_property energy_battery_props[] = { 284 POWER_SUPPLY_PROP_STATUS, 285 POWER_SUPPLY_PROP_PRESENT, 286 POWER_SUPPLY_PROP_TECHNOLOGY, 287 POWER_SUPPLY_PROP_CYCLE_COUNT, 288 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 289 POWER_SUPPLY_PROP_VOLTAGE_NOW, 290 POWER_SUPPLY_PROP_POWER_NOW, 291 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 292 POWER_SUPPLY_PROP_ENERGY_FULL, 293 POWER_SUPPLY_PROP_ENERGY_NOW, 294 POWER_SUPPLY_PROP_MODEL_NAME, 295 POWER_SUPPLY_PROP_MANUFACTURER, 296 POWER_SUPPLY_PROP_SERIAL_NUMBER, 297 }; 298 299 #ifdef CONFIG_ACPI_PROCFS_POWER 300 inline char *acpi_battery_units(struct acpi_battery *battery) 301 { 302 return (battery->power_unit)?"mA":"mW"; 303 } 304 #endif 305 306 /* -------------------------------------------------------------------------- 307 Battery Management 308 -------------------------------------------------------------------------- */ 309 struct acpi_offsets { 310 size_t offset; /* offset inside struct acpi_sbs_battery */ 311 u8 mode; /* int or string? */ 312 }; 313 314 static struct acpi_offsets state_offsets[] = { 315 {offsetof(struct acpi_battery, state), 0}, 316 {offsetof(struct acpi_battery, rate_now), 0}, 317 {offsetof(struct acpi_battery, capacity_now), 0}, 318 {offsetof(struct acpi_battery, voltage_now), 0}, 319 }; 320 321 static struct acpi_offsets info_offsets[] = { 322 {offsetof(struct acpi_battery, power_unit), 0}, 323 {offsetof(struct acpi_battery, design_capacity), 0}, 324 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 325 {offsetof(struct acpi_battery, technology), 0}, 326 {offsetof(struct acpi_battery, design_voltage), 0}, 327 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 328 {offsetof(struct acpi_battery, design_capacity_low), 0}, 329 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 330 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 331 {offsetof(struct acpi_battery, model_number), 1}, 332 {offsetof(struct acpi_battery, serial_number), 1}, 333 {offsetof(struct acpi_battery, type), 1}, 334 {offsetof(struct acpi_battery, oem_info), 1}, 335 }; 336 337 static struct acpi_offsets extended_info_offsets[] = { 338 {offsetof(struct acpi_battery, power_unit), 0}, 339 {offsetof(struct acpi_battery, design_capacity), 0}, 340 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 341 {offsetof(struct acpi_battery, technology), 0}, 342 {offsetof(struct acpi_battery, design_voltage), 0}, 343 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 344 {offsetof(struct acpi_battery, design_capacity_low), 0}, 345 {offsetof(struct acpi_battery, cycle_count), 0}, 346 {offsetof(struct acpi_battery, measurement_accuracy), 0}, 347 {offsetof(struct acpi_battery, max_sampling_time), 0}, 348 {offsetof(struct acpi_battery, min_sampling_time), 0}, 349 {offsetof(struct acpi_battery, max_averaging_interval), 0}, 350 {offsetof(struct acpi_battery, min_averaging_interval), 0}, 351 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 352 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 353 {offsetof(struct acpi_battery, model_number), 1}, 354 {offsetof(struct acpi_battery, serial_number), 1}, 355 {offsetof(struct acpi_battery, type), 1}, 356 {offsetof(struct acpi_battery, oem_info), 1}, 357 }; 358 359 static int extract_package(struct acpi_battery *battery, 360 union acpi_object *package, 361 struct acpi_offsets *offsets, int num) 362 { 363 int i; 364 union acpi_object *element; 365 if (package->type != ACPI_TYPE_PACKAGE) 366 return -EFAULT; 367 for (i = 0; i < num; ++i) { 368 if (package->package.count <= i) 369 return -EFAULT; 370 element = &package->package.elements[i]; 371 if (offsets[i].mode) { 372 u8 *ptr = (u8 *)battery + offsets[i].offset; 373 if (element->type == ACPI_TYPE_STRING || 374 element->type == ACPI_TYPE_BUFFER) 375 strncpy(ptr, element->string.pointer, 32); 376 else if (element->type == ACPI_TYPE_INTEGER) { 377 strncpy(ptr, (u8 *)&element->integer.value, 378 sizeof(u64)); 379 ptr[sizeof(u64)] = 0; 380 } else 381 *ptr = 0; /* don't have value */ 382 } else { 383 int *x = (int *)((u8 *)battery + offsets[i].offset); 384 *x = (element->type == ACPI_TYPE_INTEGER) ? 385 element->integer.value : -1; 386 } 387 } 388 return 0; 389 } 390 391 static int acpi_battery_get_status(struct acpi_battery *battery) 392 { 393 if (acpi_bus_get_status(battery->device)) { 394 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA")); 395 return -ENODEV; 396 } 397 return 0; 398 } 399 400 static int acpi_battery_get_info(struct acpi_battery *battery) 401 { 402 int result = -EFAULT; 403 acpi_status status = 0; 404 char *name = test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)? 405 "_BIX" : "_BIF"; 406 407 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 408 409 if (!acpi_battery_present(battery)) 410 return 0; 411 mutex_lock(&battery->lock); 412 status = acpi_evaluate_object(battery->device->handle, name, 413 NULL, &buffer); 414 mutex_unlock(&battery->lock); 415 416 if (ACPI_FAILURE(status)) { 417 ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name)); 418 return -ENODEV; 419 } 420 if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags)) 421 result = extract_package(battery, buffer.pointer, 422 extended_info_offsets, 423 ARRAY_SIZE(extended_info_offsets)); 424 else 425 result = extract_package(battery, buffer.pointer, 426 info_offsets, ARRAY_SIZE(info_offsets)); 427 kfree(buffer.pointer); 428 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 429 battery->full_charge_capacity = battery->design_capacity; 430 return result; 431 } 432 433 static int acpi_battery_get_state(struct acpi_battery *battery) 434 { 435 int result = 0; 436 acpi_status status = 0; 437 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 438 439 if (!acpi_battery_present(battery)) 440 return 0; 441 442 if (battery->update_time && 443 time_before(jiffies, battery->update_time + 444 msecs_to_jiffies(cache_time))) 445 return 0; 446 447 mutex_lock(&battery->lock); 448 status = acpi_evaluate_object(battery->device->handle, "_BST", 449 NULL, &buffer); 450 mutex_unlock(&battery->lock); 451 452 if (ACPI_FAILURE(status)) { 453 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST")); 454 return -ENODEV; 455 } 456 457 result = extract_package(battery, buffer.pointer, 458 state_offsets, ARRAY_SIZE(state_offsets)); 459 battery->update_time = jiffies; 460 kfree(buffer.pointer); 461 462 if (test_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags) && 463 battery->rate_now != -1) 464 battery->rate_now = abs((s16)battery->rate_now); 465 466 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags) 467 && battery->capacity_now >= 0 && battery->capacity_now <= 100) 468 battery->capacity_now = (battery->capacity_now * 469 battery->full_charge_capacity) / 100; 470 return result; 471 } 472 473 static int acpi_battery_set_alarm(struct acpi_battery *battery) 474 { 475 acpi_status status = 0; 476 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER }; 477 struct acpi_object_list arg_list = { 1, &arg0 }; 478 479 if (!acpi_battery_present(battery) || 480 !test_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags)) 481 return -ENODEV; 482 483 arg0.integer.value = battery->alarm; 484 485 mutex_lock(&battery->lock); 486 status = acpi_evaluate_object(battery->device->handle, "_BTP", 487 &arg_list, NULL); 488 mutex_unlock(&battery->lock); 489 490 if (ACPI_FAILURE(status)) 491 return -ENODEV; 492 493 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm)); 494 return 0; 495 } 496 497 static int acpi_battery_init_alarm(struct acpi_battery *battery) 498 { 499 acpi_status status = AE_OK; 500 acpi_handle handle = NULL; 501 502 /* See if alarms are supported, and if so, set default */ 503 status = acpi_get_handle(battery->device->handle, "_BTP", &handle); 504 if (ACPI_FAILURE(status)) { 505 clear_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 506 return 0; 507 } 508 set_bit(ACPI_BATTERY_ALARM_PRESENT, &battery->flags); 509 if (!battery->alarm) 510 battery->alarm = battery->design_capacity_warning; 511 return acpi_battery_set_alarm(battery); 512 } 513 514 static ssize_t acpi_battery_alarm_show(struct device *dev, 515 struct device_attribute *attr, 516 char *buf) 517 { 518 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 519 return sprintf(buf, "%d\n", battery->alarm * 1000); 520 } 521 522 static ssize_t acpi_battery_alarm_store(struct device *dev, 523 struct device_attribute *attr, 524 const char *buf, size_t count) 525 { 526 unsigned long x; 527 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 528 if (sscanf(buf, "%ld\n", &x) == 1) 529 battery->alarm = x/1000; 530 if (acpi_battery_present(battery)) 531 acpi_battery_set_alarm(battery); 532 return count; 533 } 534 535 static struct device_attribute alarm_attr = { 536 .attr = {.name = "alarm", .mode = 0644}, 537 .show = acpi_battery_alarm_show, 538 .store = acpi_battery_alarm_store, 539 }; 540 541 static int sysfs_add_battery(struct acpi_battery *battery) 542 { 543 int result; 544 545 if (battery->power_unit) { 546 battery->bat.properties = charge_battery_props; 547 battery->bat.num_properties = 548 ARRAY_SIZE(charge_battery_props); 549 } else { 550 battery->bat.properties = energy_battery_props; 551 battery->bat.num_properties = 552 ARRAY_SIZE(energy_battery_props); 553 } 554 555 battery->bat.name = acpi_device_bid(battery->device); 556 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY; 557 battery->bat.get_property = acpi_battery_get_property; 558 559 result = power_supply_register(&battery->device->dev, &battery->bat); 560 if (result) 561 return result; 562 return device_create_file(battery->bat.dev, &alarm_attr); 563 } 564 565 static void sysfs_remove_battery(struct acpi_battery *battery) 566 { 567 if (!battery->bat.dev) 568 return; 569 device_remove_file(battery->bat.dev, &alarm_attr); 570 power_supply_unregister(&battery->bat); 571 battery->bat.dev = NULL; 572 } 573 574 static void acpi_battery_quirks(struct acpi_battery *battery) 575 { 576 if (dmi_name_in_vendors("Acer") && battery->power_unit) { 577 set_bit(ACPI_BATTERY_QUIRK_SIGNED16_CURRENT, &battery->flags); 578 } 579 } 580 581 /* 582 * According to the ACPI spec, some kinds of primary batteries can 583 * report percentage battery remaining capacity directly to OS. 584 * In this case, it reports the Last Full Charged Capacity == 100 585 * and BatteryPresentRate == 0xFFFFFFFF. 586 * 587 * Now we found some battery reports percentage remaining capacity 588 * even if it's rechargeable. 589 * https://bugzilla.kernel.org/show_bug.cgi?id=15979 590 * 591 * Handle this correctly so that they won't break userspace. 592 */ 593 static void acpi_battery_quirks2(struct acpi_battery *battery) 594 { 595 if (test_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags)) 596 return ; 597 598 if (battery->full_charge_capacity == 100 && 599 battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN && 600 battery->capacity_now >=0 && battery->capacity_now <= 100) { 601 set_bit(ACPI_BATTERY_QUIRK_PERCENTAGE_CAPACITY, &battery->flags); 602 battery->full_charge_capacity = battery->design_capacity; 603 battery->capacity_now = (battery->capacity_now * 604 battery->full_charge_capacity) / 100; 605 } 606 } 607 608 static int acpi_battery_update(struct acpi_battery *battery) 609 { 610 int result, old_present = acpi_battery_present(battery); 611 result = acpi_battery_get_status(battery); 612 if (result) 613 return result; 614 if (!acpi_battery_present(battery)) { 615 sysfs_remove_battery(battery); 616 battery->update_time = 0; 617 return 0; 618 } 619 if (!battery->update_time || 620 old_present != acpi_battery_present(battery)) { 621 result = acpi_battery_get_info(battery); 622 if (result) 623 return result; 624 acpi_battery_quirks(battery); 625 acpi_battery_init_alarm(battery); 626 } 627 if (!battery->bat.dev) 628 sysfs_add_battery(battery); 629 result = acpi_battery_get_state(battery); 630 acpi_battery_quirks2(battery); 631 return result; 632 } 633 634 /* -------------------------------------------------------------------------- 635 FS Interface (/proc) 636 -------------------------------------------------------------------------- */ 637 638 #ifdef CONFIG_ACPI_PROCFS_POWER 639 static struct proc_dir_entry *acpi_battery_dir; 640 641 static int acpi_battery_print_info(struct seq_file *seq, int result) 642 { 643 struct acpi_battery *battery = seq->private; 644 645 if (result) 646 goto end; 647 648 seq_printf(seq, "present: %s\n", 649 acpi_battery_present(battery)?"yes":"no"); 650 if (!acpi_battery_present(battery)) 651 goto end; 652 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 653 seq_printf(seq, "design capacity: unknown\n"); 654 else 655 seq_printf(seq, "design capacity: %d %sh\n", 656 battery->design_capacity, 657 acpi_battery_units(battery)); 658 659 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 660 seq_printf(seq, "last full capacity: unknown\n"); 661 else 662 seq_printf(seq, "last full capacity: %d %sh\n", 663 battery->full_charge_capacity, 664 acpi_battery_units(battery)); 665 666 seq_printf(seq, "battery technology: %srechargeable\n", 667 (!battery->technology)?"non-":""); 668 669 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 670 seq_printf(seq, "design voltage: unknown\n"); 671 else 672 seq_printf(seq, "design voltage: %d mV\n", 673 battery->design_voltage); 674 seq_printf(seq, "design capacity warning: %d %sh\n", 675 battery->design_capacity_warning, 676 acpi_battery_units(battery)); 677 seq_printf(seq, "design capacity low: %d %sh\n", 678 battery->design_capacity_low, 679 acpi_battery_units(battery)); 680 seq_printf(seq, "cycle count: %i\n", battery->cycle_count); 681 seq_printf(seq, "capacity granularity 1: %d %sh\n", 682 battery->capacity_granularity_1, 683 acpi_battery_units(battery)); 684 seq_printf(seq, "capacity granularity 2: %d %sh\n", 685 battery->capacity_granularity_2, 686 acpi_battery_units(battery)); 687 seq_printf(seq, "model number: %s\n", battery->model_number); 688 seq_printf(seq, "serial number: %s\n", battery->serial_number); 689 seq_printf(seq, "battery type: %s\n", battery->type); 690 seq_printf(seq, "OEM info: %s\n", battery->oem_info); 691 end: 692 if (result) 693 seq_printf(seq, "ERROR: Unable to read battery info\n"); 694 return result; 695 } 696 697 static int acpi_battery_print_state(struct seq_file *seq, int result) 698 { 699 struct acpi_battery *battery = seq->private; 700 701 if (result) 702 goto end; 703 704 seq_printf(seq, "present: %s\n", 705 acpi_battery_present(battery)?"yes":"no"); 706 if (!acpi_battery_present(battery)) 707 goto end; 708 709 seq_printf(seq, "capacity state: %s\n", 710 (battery->state & 0x04)?"critical":"ok"); 711 if ((battery->state & 0x01) && (battery->state & 0x02)) 712 seq_printf(seq, 713 "charging state: charging/discharging\n"); 714 else if (battery->state & 0x01) 715 seq_printf(seq, "charging state: discharging\n"); 716 else if (battery->state & 0x02) 717 seq_printf(seq, "charging state: charging\n"); 718 else 719 seq_printf(seq, "charging state: charged\n"); 720 721 if (battery->rate_now == ACPI_BATTERY_VALUE_UNKNOWN) 722 seq_printf(seq, "present rate: unknown\n"); 723 else 724 seq_printf(seq, "present rate: %d %s\n", 725 battery->rate_now, acpi_battery_units(battery)); 726 727 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 728 seq_printf(seq, "remaining capacity: unknown\n"); 729 else 730 seq_printf(seq, "remaining capacity: %d %sh\n", 731 battery->capacity_now, acpi_battery_units(battery)); 732 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 733 seq_printf(seq, "present voltage: unknown\n"); 734 else 735 seq_printf(seq, "present voltage: %d mV\n", 736 battery->voltage_now); 737 end: 738 if (result) 739 seq_printf(seq, "ERROR: Unable to read battery state\n"); 740 741 return result; 742 } 743 744 static int acpi_battery_print_alarm(struct seq_file *seq, int result) 745 { 746 struct acpi_battery *battery = seq->private; 747 748 if (result) 749 goto end; 750 751 if (!acpi_battery_present(battery)) { 752 seq_printf(seq, "present: no\n"); 753 goto end; 754 } 755 seq_printf(seq, "alarm: "); 756 if (!battery->alarm) 757 seq_printf(seq, "unsupported\n"); 758 else 759 seq_printf(seq, "%u %sh\n", battery->alarm, 760 acpi_battery_units(battery)); 761 end: 762 if (result) 763 seq_printf(seq, "ERROR: Unable to read battery alarm\n"); 764 return result; 765 } 766 767 static ssize_t acpi_battery_write_alarm(struct file *file, 768 const char __user * buffer, 769 size_t count, loff_t * ppos) 770 { 771 int result = 0; 772 char alarm_string[12] = { '\0' }; 773 struct seq_file *m = file->private_data; 774 struct acpi_battery *battery = m->private; 775 776 if (!battery || (count > sizeof(alarm_string) - 1)) 777 return -EINVAL; 778 if (!acpi_battery_present(battery)) { 779 result = -ENODEV; 780 goto end; 781 } 782 if (copy_from_user(alarm_string, buffer, count)) { 783 result = -EFAULT; 784 goto end; 785 } 786 alarm_string[count] = '\0'; 787 battery->alarm = simple_strtol(alarm_string, NULL, 0); 788 result = acpi_battery_set_alarm(battery); 789 end: 790 if (!result) 791 return count; 792 return result; 793 } 794 795 typedef int(*print_func)(struct seq_file *seq, int result); 796 797 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = { 798 acpi_battery_print_info, 799 acpi_battery_print_state, 800 acpi_battery_print_alarm, 801 }; 802 803 static int acpi_battery_read(int fid, struct seq_file *seq) 804 { 805 struct acpi_battery *battery = seq->private; 806 int result = acpi_battery_update(battery); 807 return acpi_print_funcs[fid](seq, result); 808 } 809 810 #define DECLARE_FILE_FUNCTIONS(_name) \ 811 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \ 812 { \ 813 return acpi_battery_read(_name##_tag, seq); \ 814 } \ 815 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \ 816 { \ 817 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \ 818 } 819 820 DECLARE_FILE_FUNCTIONS(info); 821 DECLARE_FILE_FUNCTIONS(state); 822 DECLARE_FILE_FUNCTIONS(alarm); 823 824 #undef DECLARE_FILE_FUNCTIONS 825 826 #define FILE_DESCRIPTION_RO(_name) \ 827 { \ 828 .name = __stringify(_name), \ 829 .mode = S_IRUGO, \ 830 .ops = { \ 831 .open = acpi_battery_##_name##_open_fs, \ 832 .read = seq_read, \ 833 .llseek = seq_lseek, \ 834 .release = single_release, \ 835 .owner = THIS_MODULE, \ 836 }, \ 837 } 838 839 #define FILE_DESCRIPTION_RW(_name) \ 840 { \ 841 .name = __stringify(_name), \ 842 .mode = S_IFREG | S_IRUGO | S_IWUSR, \ 843 .ops = { \ 844 .open = acpi_battery_##_name##_open_fs, \ 845 .read = seq_read, \ 846 .llseek = seq_lseek, \ 847 .write = acpi_battery_write_##_name, \ 848 .release = single_release, \ 849 .owner = THIS_MODULE, \ 850 }, \ 851 } 852 853 static struct battery_file { 854 struct file_operations ops; 855 mode_t mode; 856 const char *name; 857 } acpi_battery_file[] = { 858 FILE_DESCRIPTION_RO(info), 859 FILE_DESCRIPTION_RO(state), 860 FILE_DESCRIPTION_RW(alarm), 861 }; 862 863 #undef FILE_DESCRIPTION_RO 864 #undef FILE_DESCRIPTION_RW 865 866 static int acpi_battery_add_fs(struct acpi_device *device) 867 { 868 struct proc_dir_entry *entry = NULL; 869 int i; 870 871 if (!acpi_device_dir(device)) { 872 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 873 acpi_battery_dir); 874 if (!acpi_device_dir(device)) 875 return -ENODEV; 876 } 877 878 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) { 879 entry = proc_create_data(acpi_battery_file[i].name, 880 acpi_battery_file[i].mode, 881 acpi_device_dir(device), 882 &acpi_battery_file[i].ops, 883 acpi_driver_data(device)); 884 if (!entry) 885 return -ENODEV; 886 } 887 return 0; 888 } 889 890 static void acpi_battery_remove_fs(struct acpi_device *device) 891 { 892 int i; 893 if (!acpi_device_dir(device)) 894 return; 895 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) 896 remove_proc_entry(acpi_battery_file[i].name, 897 acpi_device_dir(device)); 898 899 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir); 900 acpi_device_dir(device) = NULL; 901 } 902 903 #endif 904 905 /* -------------------------------------------------------------------------- 906 Driver Interface 907 -------------------------------------------------------------------------- */ 908 909 static void acpi_battery_notify(struct acpi_device *device, u32 event) 910 { 911 struct acpi_battery *battery = acpi_driver_data(device); 912 struct device *old; 913 914 if (!battery) 915 return; 916 old = battery->bat.dev; 917 acpi_battery_update(battery); 918 acpi_bus_generate_proc_event(device, event, 919 acpi_battery_present(battery)); 920 acpi_bus_generate_netlink_event(device->pnp.device_class, 921 dev_name(&device->dev), event, 922 acpi_battery_present(battery)); 923 /* acpi_battery_update could remove power_supply object */ 924 if (old && battery->bat.dev) 925 power_supply_changed(&battery->bat); 926 } 927 928 static int acpi_battery_add(struct acpi_device *device) 929 { 930 int result = 0; 931 struct acpi_battery *battery = NULL; 932 acpi_handle handle; 933 if (!device) 934 return -EINVAL; 935 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 936 if (!battery) 937 return -ENOMEM; 938 battery->device = device; 939 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 940 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 941 device->driver_data = battery; 942 mutex_init(&battery->lock); 943 if (ACPI_SUCCESS(acpi_get_handle(battery->device->handle, 944 "_BIX", &handle))) 945 set_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags); 946 acpi_battery_update(battery); 947 #ifdef CONFIG_ACPI_PROCFS_POWER 948 result = acpi_battery_add_fs(device); 949 #endif 950 if (!result) { 951 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n", 952 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device), 953 device->status.battery_present ? "present" : "absent"); 954 } else { 955 #ifdef CONFIG_ACPI_PROCFS_POWER 956 acpi_battery_remove_fs(device); 957 #endif 958 kfree(battery); 959 } 960 return result; 961 } 962 963 static int acpi_battery_remove(struct acpi_device *device, int type) 964 { 965 struct acpi_battery *battery = NULL; 966 967 if (!device || !acpi_driver_data(device)) 968 return -EINVAL; 969 battery = acpi_driver_data(device); 970 #ifdef CONFIG_ACPI_PROCFS_POWER 971 acpi_battery_remove_fs(device); 972 #endif 973 sysfs_remove_battery(battery); 974 mutex_destroy(&battery->lock); 975 kfree(battery); 976 return 0; 977 } 978 979 /* this is needed to learn about changes made in suspended state */ 980 static int acpi_battery_resume(struct acpi_device *device) 981 { 982 struct acpi_battery *battery; 983 if (!device) 984 return -EINVAL; 985 battery = acpi_driver_data(device); 986 battery->update_time = 0; 987 acpi_battery_update(battery); 988 return 0; 989 } 990 991 static struct acpi_driver acpi_battery_driver = { 992 .name = "battery", 993 .class = ACPI_BATTERY_CLASS, 994 .ids = battery_device_ids, 995 .flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS, 996 .ops = { 997 .add = acpi_battery_add, 998 .resume = acpi_battery_resume, 999 .remove = acpi_battery_remove, 1000 .notify = acpi_battery_notify, 1001 }, 1002 }; 1003 1004 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie) 1005 { 1006 if (acpi_disabled) 1007 return; 1008 #ifdef CONFIG_ACPI_PROCFS_POWER 1009 acpi_battery_dir = acpi_lock_battery_dir(); 1010 if (!acpi_battery_dir) 1011 return; 1012 #endif 1013 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) { 1014 #ifdef CONFIG_ACPI_PROCFS_POWER 1015 acpi_unlock_battery_dir(acpi_battery_dir); 1016 #endif 1017 return; 1018 } 1019 return; 1020 } 1021 1022 static int __init acpi_battery_init(void) 1023 { 1024 async_schedule(acpi_battery_init_async, NULL); 1025 return 0; 1026 } 1027 1028 static void __exit acpi_battery_exit(void) 1029 { 1030 acpi_bus_unregister_driver(&acpi_battery_driver); 1031 #ifdef CONFIG_ACPI_PROCFS_POWER 1032 acpi_unlock_battery_dir(acpi_battery_dir); 1033 #endif 1034 } 1035 1036 module_init(acpi_battery_init); 1037 module_exit(acpi_battery_exit); 1038