1 /* 2 * battery.c - ACPI Battery Driver (Revision: 2.0) 3 * 4 * Copyright (C) 2007 Alexey Starikovskiy <astarikovskiy@suse.de> 5 * Copyright (C) 2004-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com> 6 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> 7 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 8 * 9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or (at 14 * your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 19 * General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License along 22 * with this program; if not, write to the Free Software Foundation, Inc., 23 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 24 * 25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 26 */ 27 28 #include <linux/kernel.h> 29 #include <linux/module.h> 30 #include <linux/init.h> 31 #include <linux/types.h> 32 #include <linux/jiffies.h> 33 34 #ifdef CONFIG_ACPI_PROCFS_POWER 35 #include <linux/proc_fs.h> 36 #include <linux/seq_file.h> 37 #include <asm/uaccess.h> 38 #endif 39 40 #include <acpi/acpi_bus.h> 41 #include <acpi/acpi_drivers.h> 42 43 #ifdef CONFIG_ACPI_SYSFS_POWER 44 #include <linux/power_supply.h> 45 #endif 46 47 #define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF 48 49 #define ACPI_BATTERY_COMPONENT 0x00040000 50 #define ACPI_BATTERY_CLASS "battery" 51 #define ACPI_BATTERY_DEVICE_NAME "Battery" 52 #define ACPI_BATTERY_NOTIFY_STATUS 0x80 53 #define ACPI_BATTERY_NOTIFY_INFO 0x81 54 55 #define _COMPONENT ACPI_BATTERY_COMPONENT 56 57 ACPI_MODULE_NAME("battery"); 58 59 MODULE_AUTHOR("Paul Diefenbaugh"); 60 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 61 MODULE_DESCRIPTION("ACPI Battery Driver"); 62 MODULE_LICENSE("GPL"); 63 64 static unsigned int cache_time = 1000; 65 module_param(cache_time, uint, 0644); 66 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 67 68 #ifdef CONFIG_ACPI_PROCFS_POWER 69 extern struct proc_dir_entry *acpi_lock_battery_dir(void); 70 extern void *acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir); 71 72 enum acpi_battery_files { 73 info_tag = 0, 74 state_tag, 75 alarm_tag, 76 ACPI_BATTERY_NUMFILES, 77 }; 78 79 #endif 80 81 static const struct acpi_device_id battery_device_ids[] = { 82 {"PNP0C0A", 0}, 83 {"", 0}, 84 }; 85 86 MODULE_DEVICE_TABLE(acpi, battery_device_ids); 87 88 89 struct acpi_battery { 90 struct mutex lock; 91 #ifdef CONFIG_ACPI_SYSFS_POWER 92 struct power_supply bat; 93 #endif 94 struct acpi_device *device; 95 unsigned long update_time; 96 int current_now; 97 int capacity_now; 98 int voltage_now; 99 int design_capacity; 100 int full_charge_capacity; 101 int technology; 102 int design_voltage; 103 int design_capacity_warning; 104 int design_capacity_low; 105 int capacity_granularity_1; 106 int capacity_granularity_2; 107 int alarm; 108 char model_number[32]; 109 char serial_number[32]; 110 char type[32]; 111 char oem_info[32]; 112 int state; 113 int power_unit; 114 u8 alarm_present; 115 }; 116 117 #define to_acpi_battery(x) container_of(x, struct acpi_battery, bat); 118 119 inline int acpi_battery_present(struct acpi_battery *battery) 120 { 121 return battery->device->status.battery_present; 122 } 123 124 #ifdef CONFIG_ACPI_SYSFS_POWER 125 static int acpi_battery_technology(struct acpi_battery *battery) 126 { 127 if (!strcasecmp("NiCd", battery->type)) 128 return POWER_SUPPLY_TECHNOLOGY_NiCd; 129 if (!strcasecmp("NiMH", battery->type)) 130 return POWER_SUPPLY_TECHNOLOGY_NiMH; 131 if (!strcasecmp("LION", battery->type)) 132 return POWER_SUPPLY_TECHNOLOGY_LION; 133 if (!strncasecmp("LI-ION", battery->type, 6)) 134 return POWER_SUPPLY_TECHNOLOGY_LION; 135 if (!strcasecmp("LiP", battery->type)) 136 return POWER_SUPPLY_TECHNOLOGY_LIPO; 137 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 138 } 139 140 static int acpi_battery_get_state(struct acpi_battery *battery); 141 142 static int acpi_battery_get_property(struct power_supply *psy, 143 enum power_supply_property psp, 144 union power_supply_propval *val) 145 { 146 struct acpi_battery *battery = to_acpi_battery(psy); 147 148 if (acpi_battery_present(battery)) { 149 /* run battery update only if it is present */ 150 acpi_battery_get_state(battery); 151 } else if (psp != POWER_SUPPLY_PROP_PRESENT) 152 return -ENODEV; 153 switch (psp) { 154 case POWER_SUPPLY_PROP_STATUS: 155 if (battery->state & 0x01) 156 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 157 else if (battery->state & 0x02) 158 val->intval = POWER_SUPPLY_STATUS_CHARGING; 159 else if (battery->state == 0) 160 val->intval = POWER_SUPPLY_STATUS_FULL; 161 else 162 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 163 break; 164 case POWER_SUPPLY_PROP_PRESENT: 165 val->intval = acpi_battery_present(battery); 166 break; 167 case POWER_SUPPLY_PROP_TECHNOLOGY: 168 val->intval = acpi_battery_technology(battery); 169 break; 170 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 171 val->intval = battery->design_voltage * 1000; 172 break; 173 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 174 val->intval = battery->voltage_now * 1000; 175 break; 176 case POWER_SUPPLY_PROP_CURRENT_NOW: 177 val->intval = battery->current_now * 1000; 178 break; 179 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 180 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 181 val->intval = battery->design_capacity * 1000; 182 break; 183 case POWER_SUPPLY_PROP_CHARGE_FULL: 184 case POWER_SUPPLY_PROP_ENERGY_FULL: 185 val->intval = battery->full_charge_capacity * 1000; 186 break; 187 case POWER_SUPPLY_PROP_CHARGE_NOW: 188 case POWER_SUPPLY_PROP_ENERGY_NOW: 189 val->intval = battery->capacity_now * 1000; 190 break; 191 case POWER_SUPPLY_PROP_MODEL_NAME: 192 val->strval = battery->model_number; 193 break; 194 case POWER_SUPPLY_PROP_MANUFACTURER: 195 val->strval = battery->oem_info; 196 break; 197 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 198 val->strval = battery->serial_number; 199 break; 200 default: 201 return -EINVAL; 202 } 203 return 0; 204 } 205 206 static enum power_supply_property charge_battery_props[] = { 207 POWER_SUPPLY_PROP_STATUS, 208 POWER_SUPPLY_PROP_PRESENT, 209 POWER_SUPPLY_PROP_TECHNOLOGY, 210 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 211 POWER_SUPPLY_PROP_VOLTAGE_NOW, 212 POWER_SUPPLY_PROP_CURRENT_NOW, 213 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 214 POWER_SUPPLY_PROP_CHARGE_FULL, 215 POWER_SUPPLY_PROP_CHARGE_NOW, 216 POWER_SUPPLY_PROP_MODEL_NAME, 217 POWER_SUPPLY_PROP_MANUFACTURER, 218 POWER_SUPPLY_PROP_SERIAL_NUMBER, 219 }; 220 221 static enum power_supply_property energy_battery_props[] = { 222 POWER_SUPPLY_PROP_STATUS, 223 POWER_SUPPLY_PROP_PRESENT, 224 POWER_SUPPLY_PROP_TECHNOLOGY, 225 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 226 POWER_SUPPLY_PROP_VOLTAGE_NOW, 227 POWER_SUPPLY_PROP_CURRENT_NOW, 228 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 229 POWER_SUPPLY_PROP_ENERGY_FULL, 230 POWER_SUPPLY_PROP_ENERGY_NOW, 231 POWER_SUPPLY_PROP_MODEL_NAME, 232 POWER_SUPPLY_PROP_MANUFACTURER, 233 POWER_SUPPLY_PROP_SERIAL_NUMBER, 234 }; 235 #endif 236 237 #ifdef CONFIG_ACPI_PROCFS_POWER 238 inline char *acpi_battery_units(struct acpi_battery *battery) 239 { 240 return (battery->power_unit)?"mA":"mW"; 241 } 242 #endif 243 244 /* -------------------------------------------------------------------------- 245 Battery Management 246 -------------------------------------------------------------------------- */ 247 struct acpi_offsets { 248 size_t offset; /* offset inside struct acpi_sbs_battery */ 249 u8 mode; /* int or string? */ 250 }; 251 252 static struct acpi_offsets state_offsets[] = { 253 {offsetof(struct acpi_battery, state), 0}, 254 {offsetof(struct acpi_battery, current_now), 0}, 255 {offsetof(struct acpi_battery, capacity_now), 0}, 256 {offsetof(struct acpi_battery, voltage_now), 0}, 257 }; 258 259 static struct acpi_offsets info_offsets[] = { 260 {offsetof(struct acpi_battery, power_unit), 0}, 261 {offsetof(struct acpi_battery, design_capacity), 0}, 262 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 263 {offsetof(struct acpi_battery, technology), 0}, 264 {offsetof(struct acpi_battery, design_voltage), 0}, 265 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 266 {offsetof(struct acpi_battery, design_capacity_low), 0}, 267 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 268 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 269 {offsetof(struct acpi_battery, model_number), 1}, 270 {offsetof(struct acpi_battery, serial_number), 1}, 271 {offsetof(struct acpi_battery, type), 1}, 272 {offsetof(struct acpi_battery, oem_info), 1}, 273 }; 274 275 static int extract_package(struct acpi_battery *battery, 276 union acpi_object *package, 277 struct acpi_offsets *offsets, int num) 278 { 279 int i; 280 union acpi_object *element; 281 if (package->type != ACPI_TYPE_PACKAGE) 282 return -EFAULT; 283 for (i = 0; i < num; ++i) { 284 if (package->package.count <= i) 285 return -EFAULT; 286 element = &package->package.elements[i]; 287 if (offsets[i].mode) { 288 u8 *ptr = (u8 *)battery + offsets[i].offset; 289 if (element->type == ACPI_TYPE_STRING || 290 element->type == ACPI_TYPE_BUFFER) 291 strncpy(ptr, element->string.pointer, 32); 292 else if (element->type == ACPI_TYPE_INTEGER) { 293 strncpy(ptr, (u8 *)&element->integer.value, 294 sizeof(acpi_integer)); 295 ptr[sizeof(acpi_integer)] = 0; 296 } else 297 *ptr = 0; /* don't have value */ 298 } else { 299 int *x = (int *)((u8 *)battery + offsets[i].offset); 300 *x = (element->type == ACPI_TYPE_INTEGER) ? 301 element->integer.value : -1; 302 } 303 } 304 return 0; 305 } 306 307 static int acpi_battery_get_status(struct acpi_battery *battery) 308 { 309 if (acpi_bus_get_status(battery->device)) { 310 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA")); 311 return -ENODEV; 312 } 313 return 0; 314 } 315 316 static int acpi_battery_get_info(struct acpi_battery *battery) 317 { 318 int result = -EFAULT; 319 acpi_status status = 0; 320 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 321 322 if (!acpi_battery_present(battery)) 323 return 0; 324 mutex_lock(&battery->lock); 325 status = acpi_evaluate_object(battery->device->handle, "_BIF", 326 NULL, &buffer); 327 mutex_unlock(&battery->lock); 328 329 if (ACPI_FAILURE(status)) { 330 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF")); 331 return -ENODEV; 332 } 333 334 result = extract_package(battery, buffer.pointer, 335 info_offsets, ARRAY_SIZE(info_offsets)); 336 kfree(buffer.pointer); 337 return result; 338 } 339 340 static int acpi_battery_get_state(struct acpi_battery *battery) 341 { 342 int result = 0; 343 acpi_status status = 0; 344 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 345 346 if (!acpi_battery_present(battery)) 347 return 0; 348 349 if (battery->update_time && 350 time_before(jiffies, battery->update_time + 351 msecs_to_jiffies(cache_time))) 352 return 0; 353 354 mutex_lock(&battery->lock); 355 status = acpi_evaluate_object(battery->device->handle, "_BST", 356 NULL, &buffer); 357 mutex_unlock(&battery->lock); 358 359 if (ACPI_FAILURE(status)) { 360 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST")); 361 return -ENODEV; 362 } 363 364 result = extract_package(battery, buffer.pointer, 365 state_offsets, ARRAY_SIZE(state_offsets)); 366 battery->update_time = jiffies; 367 kfree(buffer.pointer); 368 return result; 369 } 370 371 static int acpi_battery_set_alarm(struct acpi_battery *battery) 372 { 373 acpi_status status = 0; 374 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER }; 375 struct acpi_object_list arg_list = { 1, &arg0 }; 376 377 if (!acpi_battery_present(battery)|| !battery->alarm_present) 378 return -ENODEV; 379 380 arg0.integer.value = battery->alarm; 381 382 mutex_lock(&battery->lock); 383 status = acpi_evaluate_object(battery->device->handle, "_BTP", 384 &arg_list, NULL); 385 mutex_unlock(&battery->lock); 386 387 if (ACPI_FAILURE(status)) 388 return -ENODEV; 389 390 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm)); 391 return 0; 392 } 393 394 static int acpi_battery_init_alarm(struct acpi_battery *battery) 395 { 396 acpi_status status = AE_OK; 397 acpi_handle handle = NULL; 398 399 /* See if alarms are supported, and if so, set default */ 400 status = acpi_get_handle(battery->device->handle, "_BTP", &handle); 401 if (ACPI_FAILURE(status)) { 402 battery->alarm_present = 0; 403 return 0; 404 } 405 battery->alarm_present = 1; 406 if (!battery->alarm) 407 battery->alarm = battery->design_capacity_warning; 408 return acpi_battery_set_alarm(battery); 409 } 410 411 #ifdef CONFIG_ACPI_SYSFS_POWER 412 static ssize_t acpi_battery_alarm_show(struct device *dev, 413 struct device_attribute *attr, 414 char *buf) 415 { 416 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 417 return sprintf(buf, "%d\n", battery->alarm * 1000); 418 } 419 420 static ssize_t acpi_battery_alarm_store(struct device *dev, 421 struct device_attribute *attr, 422 const char *buf, size_t count) 423 { 424 unsigned long x; 425 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 426 if (sscanf(buf, "%ld\n", &x) == 1) 427 battery->alarm = x/1000; 428 if (acpi_battery_present(battery)) 429 acpi_battery_set_alarm(battery); 430 return count; 431 } 432 433 static struct device_attribute alarm_attr = { 434 .attr = {.name = "alarm", .mode = 0644}, 435 .show = acpi_battery_alarm_show, 436 .store = acpi_battery_alarm_store, 437 }; 438 439 static int sysfs_add_battery(struct acpi_battery *battery) 440 { 441 int result; 442 443 if (battery->power_unit) { 444 battery->bat.properties = charge_battery_props; 445 battery->bat.num_properties = 446 ARRAY_SIZE(charge_battery_props); 447 } else { 448 battery->bat.properties = energy_battery_props; 449 battery->bat.num_properties = 450 ARRAY_SIZE(energy_battery_props); 451 } 452 453 battery->bat.name = acpi_device_bid(battery->device); 454 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY; 455 battery->bat.get_property = acpi_battery_get_property; 456 457 result = power_supply_register(&battery->device->dev, &battery->bat); 458 if (result) 459 return result; 460 return device_create_file(battery->bat.dev, &alarm_attr); 461 } 462 463 static void sysfs_remove_battery(struct acpi_battery *battery) 464 { 465 if (!battery->bat.dev) 466 return; 467 device_remove_file(battery->bat.dev, &alarm_attr); 468 power_supply_unregister(&battery->bat); 469 battery->bat.dev = NULL; 470 } 471 #endif 472 473 static int acpi_battery_update(struct acpi_battery *battery) 474 { 475 int result; 476 result = acpi_battery_get_status(battery); 477 if (result) 478 return result; 479 #ifdef CONFIG_ACPI_SYSFS_POWER 480 if (!acpi_battery_present(battery)) { 481 sysfs_remove_battery(battery); 482 battery->update_time = 0; 483 return 0; 484 } 485 #endif 486 if (!battery->update_time) { 487 result = acpi_battery_get_info(battery); 488 if (result) 489 return result; 490 acpi_battery_init_alarm(battery); 491 } 492 #ifdef CONFIG_ACPI_SYSFS_POWER 493 if (!battery->bat.dev) 494 sysfs_add_battery(battery); 495 #endif 496 return acpi_battery_get_state(battery); 497 } 498 499 /* -------------------------------------------------------------------------- 500 FS Interface (/proc) 501 -------------------------------------------------------------------------- */ 502 503 #ifdef CONFIG_ACPI_PROCFS_POWER 504 static struct proc_dir_entry *acpi_battery_dir; 505 506 static int acpi_battery_print_info(struct seq_file *seq, int result) 507 { 508 struct acpi_battery *battery = seq->private; 509 510 if (result) 511 goto end; 512 513 seq_printf(seq, "present: %s\n", 514 acpi_battery_present(battery)?"yes":"no"); 515 if (!acpi_battery_present(battery)) 516 goto end; 517 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 518 seq_printf(seq, "design capacity: unknown\n"); 519 else 520 seq_printf(seq, "design capacity: %d %sh\n", 521 battery->design_capacity, 522 acpi_battery_units(battery)); 523 524 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 525 seq_printf(seq, "last full capacity: unknown\n"); 526 else 527 seq_printf(seq, "last full capacity: %d %sh\n", 528 battery->full_charge_capacity, 529 acpi_battery_units(battery)); 530 531 seq_printf(seq, "battery technology: %srechargeable\n", 532 (!battery->technology)?"non-":""); 533 534 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 535 seq_printf(seq, "design voltage: unknown\n"); 536 else 537 seq_printf(seq, "design voltage: %d mV\n", 538 battery->design_voltage); 539 seq_printf(seq, "design capacity warning: %d %sh\n", 540 battery->design_capacity_warning, 541 acpi_battery_units(battery)); 542 seq_printf(seq, "design capacity low: %d %sh\n", 543 battery->design_capacity_low, 544 acpi_battery_units(battery)); 545 seq_printf(seq, "capacity granularity 1: %d %sh\n", 546 battery->capacity_granularity_1, 547 acpi_battery_units(battery)); 548 seq_printf(seq, "capacity granularity 2: %d %sh\n", 549 battery->capacity_granularity_2, 550 acpi_battery_units(battery)); 551 seq_printf(seq, "model number: %s\n", battery->model_number); 552 seq_printf(seq, "serial number: %s\n", battery->serial_number); 553 seq_printf(seq, "battery type: %s\n", battery->type); 554 seq_printf(seq, "OEM info: %s\n", battery->oem_info); 555 end: 556 if (result) 557 seq_printf(seq, "ERROR: Unable to read battery info\n"); 558 return result; 559 } 560 561 static int acpi_battery_print_state(struct seq_file *seq, int result) 562 { 563 struct acpi_battery *battery = seq->private; 564 565 if (result) 566 goto end; 567 568 seq_printf(seq, "present: %s\n", 569 acpi_battery_present(battery)?"yes":"no"); 570 if (!acpi_battery_present(battery)) 571 goto end; 572 573 seq_printf(seq, "capacity state: %s\n", 574 (battery->state & 0x04)?"critical":"ok"); 575 if ((battery->state & 0x01) && (battery->state & 0x02)) 576 seq_printf(seq, 577 "charging state: charging/discharging\n"); 578 else if (battery->state & 0x01) 579 seq_printf(seq, "charging state: discharging\n"); 580 else if (battery->state & 0x02) 581 seq_printf(seq, "charging state: charging\n"); 582 else 583 seq_printf(seq, "charging state: charged\n"); 584 585 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN) 586 seq_printf(seq, "present rate: unknown\n"); 587 else 588 seq_printf(seq, "present rate: %d %s\n", 589 battery->current_now, acpi_battery_units(battery)); 590 591 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 592 seq_printf(seq, "remaining capacity: unknown\n"); 593 else 594 seq_printf(seq, "remaining capacity: %d %sh\n", 595 battery->capacity_now, acpi_battery_units(battery)); 596 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 597 seq_printf(seq, "present voltage: unknown\n"); 598 else 599 seq_printf(seq, "present voltage: %d mV\n", 600 battery->voltage_now); 601 end: 602 if (result) 603 seq_printf(seq, "ERROR: Unable to read battery state\n"); 604 605 return result; 606 } 607 608 static int acpi_battery_print_alarm(struct seq_file *seq, int result) 609 { 610 struct acpi_battery *battery = seq->private; 611 612 if (result) 613 goto end; 614 615 if (!acpi_battery_present(battery)) { 616 seq_printf(seq, "present: no\n"); 617 goto end; 618 } 619 seq_printf(seq, "alarm: "); 620 if (!battery->alarm) 621 seq_printf(seq, "unsupported\n"); 622 else 623 seq_printf(seq, "%u %sh\n", battery->alarm, 624 acpi_battery_units(battery)); 625 end: 626 if (result) 627 seq_printf(seq, "ERROR: Unable to read battery alarm\n"); 628 return result; 629 } 630 631 static ssize_t acpi_battery_write_alarm(struct file *file, 632 const char __user * buffer, 633 size_t count, loff_t * ppos) 634 { 635 int result = 0; 636 char alarm_string[12] = { '\0' }; 637 struct seq_file *m = file->private_data; 638 struct acpi_battery *battery = m->private; 639 640 if (!battery || (count > sizeof(alarm_string) - 1)) 641 return -EINVAL; 642 if (!acpi_battery_present(battery)) { 643 result = -ENODEV; 644 goto end; 645 } 646 if (copy_from_user(alarm_string, buffer, count)) { 647 result = -EFAULT; 648 goto end; 649 } 650 alarm_string[count] = '\0'; 651 battery->alarm = simple_strtol(alarm_string, NULL, 0); 652 result = acpi_battery_set_alarm(battery); 653 end: 654 if (!result) 655 return count; 656 return result; 657 } 658 659 typedef int(*print_func)(struct seq_file *seq, int result); 660 661 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = { 662 acpi_battery_print_info, 663 acpi_battery_print_state, 664 acpi_battery_print_alarm, 665 }; 666 667 static int acpi_battery_read(int fid, struct seq_file *seq) 668 { 669 struct acpi_battery *battery = seq->private; 670 int result = acpi_battery_update(battery); 671 return acpi_print_funcs[fid](seq, result); 672 } 673 674 #define DECLARE_FILE_FUNCTIONS(_name) \ 675 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \ 676 { \ 677 return acpi_battery_read(_name##_tag, seq); \ 678 } \ 679 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \ 680 { \ 681 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \ 682 } 683 684 DECLARE_FILE_FUNCTIONS(info); 685 DECLARE_FILE_FUNCTIONS(state); 686 DECLARE_FILE_FUNCTIONS(alarm); 687 688 #undef DECLARE_FILE_FUNCTIONS 689 690 #define FILE_DESCRIPTION_RO(_name) \ 691 { \ 692 .name = __stringify(_name), \ 693 .mode = S_IRUGO, \ 694 .ops = { \ 695 .open = acpi_battery_##_name##_open_fs, \ 696 .read = seq_read, \ 697 .llseek = seq_lseek, \ 698 .release = single_release, \ 699 .owner = THIS_MODULE, \ 700 }, \ 701 } 702 703 #define FILE_DESCRIPTION_RW(_name) \ 704 { \ 705 .name = __stringify(_name), \ 706 .mode = S_IFREG | S_IRUGO | S_IWUSR, \ 707 .ops = { \ 708 .open = acpi_battery_##_name##_open_fs, \ 709 .read = seq_read, \ 710 .llseek = seq_lseek, \ 711 .write = acpi_battery_write_##_name, \ 712 .release = single_release, \ 713 .owner = THIS_MODULE, \ 714 }, \ 715 } 716 717 static struct battery_file { 718 struct file_operations ops; 719 mode_t mode; 720 char *name; 721 } acpi_battery_file[] = { 722 FILE_DESCRIPTION_RO(info), 723 FILE_DESCRIPTION_RO(state), 724 FILE_DESCRIPTION_RW(alarm), 725 }; 726 727 #undef FILE_DESCRIPTION_RO 728 #undef FILE_DESCRIPTION_RW 729 730 static int acpi_battery_add_fs(struct acpi_device *device) 731 { 732 struct proc_dir_entry *entry = NULL; 733 int i; 734 735 if (!acpi_device_dir(device)) { 736 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 737 acpi_battery_dir); 738 if (!acpi_device_dir(device)) 739 return -ENODEV; 740 acpi_device_dir(device)->owner = THIS_MODULE; 741 } 742 743 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) { 744 entry = proc_create_data(acpi_battery_file[i].name, 745 acpi_battery_file[i].mode, 746 acpi_device_dir(device), 747 &acpi_battery_file[i].ops, 748 acpi_driver_data(device)); 749 if (!entry) 750 return -ENODEV; 751 } 752 return 0; 753 } 754 755 static void acpi_battery_remove_fs(struct acpi_device *device) 756 { 757 int i; 758 if (!acpi_device_dir(device)) 759 return; 760 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) 761 remove_proc_entry(acpi_battery_file[i].name, 762 acpi_device_dir(device)); 763 764 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir); 765 acpi_device_dir(device) = NULL; 766 } 767 768 #endif 769 770 /* -------------------------------------------------------------------------- 771 Driver Interface 772 -------------------------------------------------------------------------- */ 773 774 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data) 775 { 776 struct acpi_battery *battery = data; 777 struct acpi_device *device; 778 if (!battery) 779 return; 780 device = battery->device; 781 acpi_battery_update(battery); 782 acpi_bus_generate_proc_event(device, event, 783 acpi_battery_present(battery)); 784 acpi_bus_generate_netlink_event(device->pnp.device_class, 785 device->dev.bus_id, event, 786 acpi_battery_present(battery)); 787 #ifdef CONFIG_ACPI_SYSFS_POWER 788 /* acpi_batter_update could remove power_supply object */ 789 if (battery->bat.dev) 790 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE); 791 #endif 792 } 793 794 static int acpi_battery_add(struct acpi_device *device) 795 { 796 int result = 0; 797 acpi_status status = 0; 798 struct acpi_battery *battery = NULL; 799 if (!device) 800 return -EINVAL; 801 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 802 if (!battery) 803 return -ENOMEM; 804 battery->device = device; 805 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 806 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 807 device->driver_data = battery; 808 mutex_init(&battery->lock); 809 acpi_battery_update(battery); 810 #ifdef CONFIG_ACPI_PROCFS_POWER 811 result = acpi_battery_add_fs(device); 812 if (result) 813 goto end; 814 #endif 815 status = acpi_install_notify_handler(device->handle, 816 ACPI_ALL_NOTIFY, 817 acpi_battery_notify, battery); 818 if (ACPI_FAILURE(status)) { 819 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler")); 820 result = -ENODEV; 821 goto end; 822 } 823 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n", 824 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device), 825 device->status.battery_present ? "present" : "absent"); 826 end: 827 if (result) { 828 #ifdef CONFIG_ACPI_PROCFS_POWER 829 acpi_battery_remove_fs(device); 830 #endif 831 kfree(battery); 832 } 833 return result; 834 } 835 836 static int acpi_battery_remove(struct acpi_device *device, int type) 837 { 838 acpi_status status = 0; 839 struct acpi_battery *battery = NULL; 840 841 if (!device || !acpi_driver_data(device)) 842 return -EINVAL; 843 battery = acpi_driver_data(device); 844 status = acpi_remove_notify_handler(device->handle, 845 ACPI_ALL_NOTIFY, 846 acpi_battery_notify); 847 #ifdef CONFIG_ACPI_PROCFS_POWER 848 acpi_battery_remove_fs(device); 849 #endif 850 #ifdef CONFIG_ACPI_SYSFS_POWER 851 sysfs_remove_battery(battery); 852 #endif 853 mutex_destroy(&battery->lock); 854 kfree(battery); 855 return 0; 856 } 857 858 /* this is needed to learn about changes made in suspended state */ 859 static int acpi_battery_resume(struct acpi_device *device) 860 { 861 struct acpi_battery *battery; 862 if (!device) 863 return -EINVAL; 864 battery = acpi_driver_data(device); 865 battery->update_time = 0; 866 acpi_battery_update(battery); 867 return 0; 868 } 869 870 static struct acpi_driver acpi_battery_driver = { 871 .name = "battery", 872 .class = ACPI_BATTERY_CLASS, 873 .ids = battery_device_ids, 874 .ops = { 875 .add = acpi_battery_add, 876 .resume = acpi_battery_resume, 877 .remove = acpi_battery_remove, 878 }, 879 }; 880 881 static int __init acpi_battery_init(void) 882 { 883 if (acpi_disabled) 884 return -ENODEV; 885 #ifdef CONFIG_ACPI_PROCFS_POWER 886 acpi_battery_dir = acpi_lock_battery_dir(); 887 if (!acpi_battery_dir) 888 return -ENODEV; 889 #endif 890 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) { 891 #ifdef CONFIG_ACPI_PROCFS_POWER 892 acpi_unlock_battery_dir(acpi_battery_dir); 893 #endif 894 return -ENODEV; 895 } 896 return 0; 897 } 898 899 static void __exit acpi_battery_exit(void) 900 { 901 acpi_bus_unregister_driver(&acpi_battery_driver); 902 #ifdef CONFIG_ACPI_PROCFS_POWER 903 acpi_unlock_battery_dir(acpi_battery_dir); 904 #endif 905 } 906 907 module_init(acpi_battery_init); 908 module_exit(acpi_battery_exit); 909