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