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 default: 198 return -EINVAL; 199 } 200 return 0; 201 } 202 203 static enum power_supply_property charge_battery_props[] = { 204 POWER_SUPPLY_PROP_STATUS, 205 POWER_SUPPLY_PROP_PRESENT, 206 POWER_SUPPLY_PROP_TECHNOLOGY, 207 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 208 POWER_SUPPLY_PROP_VOLTAGE_NOW, 209 POWER_SUPPLY_PROP_CURRENT_NOW, 210 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 211 POWER_SUPPLY_PROP_CHARGE_FULL, 212 POWER_SUPPLY_PROP_CHARGE_NOW, 213 POWER_SUPPLY_PROP_MODEL_NAME, 214 POWER_SUPPLY_PROP_MANUFACTURER, 215 }; 216 217 static enum power_supply_property energy_battery_props[] = { 218 POWER_SUPPLY_PROP_STATUS, 219 POWER_SUPPLY_PROP_PRESENT, 220 POWER_SUPPLY_PROP_TECHNOLOGY, 221 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 222 POWER_SUPPLY_PROP_VOLTAGE_NOW, 223 POWER_SUPPLY_PROP_CURRENT_NOW, 224 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 225 POWER_SUPPLY_PROP_ENERGY_FULL, 226 POWER_SUPPLY_PROP_ENERGY_NOW, 227 POWER_SUPPLY_PROP_MODEL_NAME, 228 POWER_SUPPLY_PROP_MANUFACTURER, 229 }; 230 #endif 231 232 #ifdef CONFIG_ACPI_PROCFS_POWER 233 inline char *acpi_battery_units(struct acpi_battery *battery) 234 { 235 return (battery->power_unit)?"mA":"mW"; 236 } 237 #endif 238 239 /* -------------------------------------------------------------------------- 240 Battery Management 241 -------------------------------------------------------------------------- */ 242 struct acpi_offsets { 243 size_t offset; /* offset inside struct acpi_sbs_battery */ 244 u8 mode; /* int or string? */ 245 }; 246 247 static struct acpi_offsets state_offsets[] = { 248 {offsetof(struct acpi_battery, state), 0}, 249 {offsetof(struct acpi_battery, current_now), 0}, 250 {offsetof(struct acpi_battery, capacity_now), 0}, 251 {offsetof(struct acpi_battery, voltage_now), 0}, 252 }; 253 254 static struct acpi_offsets info_offsets[] = { 255 {offsetof(struct acpi_battery, power_unit), 0}, 256 {offsetof(struct acpi_battery, design_capacity), 0}, 257 {offsetof(struct acpi_battery, full_charge_capacity), 0}, 258 {offsetof(struct acpi_battery, technology), 0}, 259 {offsetof(struct acpi_battery, design_voltage), 0}, 260 {offsetof(struct acpi_battery, design_capacity_warning), 0}, 261 {offsetof(struct acpi_battery, design_capacity_low), 0}, 262 {offsetof(struct acpi_battery, capacity_granularity_1), 0}, 263 {offsetof(struct acpi_battery, capacity_granularity_2), 0}, 264 {offsetof(struct acpi_battery, model_number), 1}, 265 {offsetof(struct acpi_battery, serial_number), 1}, 266 {offsetof(struct acpi_battery, type), 1}, 267 {offsetof(struct acpi_battery, oem_info), 1}, 268 }; 269 270 static int extract_package(struct acpi_battery *battery, 271 union acpi_object *package, 272 struct acpi_offsets *offsets, int num) 273 { 274 int i; 275 union acpi_object *element; 276 if (package->type != ACPI_TYPE_PACKAGE) 277 return -EFAULT; 278 for (i = 0; i < num; ++i) { 279 if (package->package.count <= i) 280 return -EFAULT; 281 element = &package->package.elements[i]; 282 if (offsets[i].mode) { 283 u8 *ptr = (u8 *)battery + offsets[i].offset; 284 if (element->type == ACPI_TYPE_STRING || 285 element->type == ACPI_TYPE_BUFFER) 286 strncpy(ptr, element->string.pointer, 32); 287 else if (element->type == ACPI_TYPE_INTEGER) { 288 strncpy(ptr, (u8 *)&element->integer.value, 289 sizeof(acpi_integer)); 290 ptr[sizeof(acpi_integer)] = 0; 291 } else return -EFAULT; 292 } else { 293 if (element->type == ACPI_TYPE_INTEGER) { 294 int *x = (int *)((u8 *)battery + 295 offsets[i].offset); 296 *x = element->integer.value; 297 } else return -EFAULT; 298 } 299 } 300 return 0; 301 } 302 303 static int acpi_battery_get_status(struct acpi_battery *battery) 304 { 305 if (acpi_bus_get_status(battery->device)) { 306 ACPI_EXCEPTION((AE_INFO, AE_ERROR, "Evaluating _STA")); 307 return -ENODEV; 308 } 309 return 0; 310 } 311 312 static int acpi_battery_get_info(struct acpi_battery *battery) 313 { 314 int result = -EFAULT; 315 acpi_status status = 0; 316 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 317 318 if (!acpi_battery_present(battery)) 319 return 0; 320 mutex_lock(&battery->lock); 321 status = acpi_evaluate_object(battery->device->handle, "_BIF", 322 NULL, &buffer); 323 mutex_unlock(&battery->lock); 324 325 if (ACPI_FAILURE(status)) { 326 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF")); 327 return -ENODEV; 328 } 329 330 result = extract_package(battery, buffer.pointer, 331 info_offsets, ARRAY_SIZE(info_offsets)); 332 kfree(buffer.pointer); 333 return result; 334 } 335 336 static int acpi_battery_get_state(struct acpi_battery *battery) 337 { 338 int result = 0; 339 acpi_status status = 0; 340 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 341 342 if (!acpi_battery_present(battery)) 343 return 0; 344 345 if (battery->update_time && 346 time_before(jiffies, battery->update_time + 347 msecs_to_jiffies(cache_time))) 348 return 0; 349 350 mutex_lock(&battery->lock); 351 status = acpi_evaluate_object(battery->device->handle, "_BST", 352 NULL, &buffer); 353 mutex_unlock(&battery->lock); 354 355 if (ACPI_FAILURE(status)) { 356 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST")); 357 return -ENODEV; 358 } 359 360 result = extract_package(battery, buffer.pointer, 361 state_offsets, ARRAY_SIZE(state_offsets)); 362 battery->update_time = jiffies; 363 kfree(buffer.pointer); 364 return result; 365 } 366 367 static int acpi_battery_set_alarm(struct acpi_battery *battery) 368 { 369 acpi_status status = 0; 370 union acpi_object arg0 = { .type = ACPI_TYPE_INTEGER }; 371 struct acpi_object_list arg_list = { 1, &arg0 }; 372 373 if (!acpi_battery_present(battery)|| !battery->alarm_present) 374 return -ENODEV; 375 376 arg0.integer.value = battery->alarm; 377 378 mutex_lock(&battery->lock); 379 status = acpi_evaluate_object(battery->device->handle, "_BTP", 380 &arg_list, NULL); 381 mutex_unlock(&battery->lock); 382 383 if (ACPI_FAILURE(status)) 384 return -ENODEV; 385 386 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Alarm set to %d\n", battery->alarm)); 387 return 0; 388 } 389 390 static int acpi_battery_init_alarm(struct acpi_battery *battery) 391 { 392 acpi_status status = AE_OK; 393 acpi_handle handle = NULL; 394 395 /* See if alarms are supported, and if so, set default */ 396 status = acpi_get_handle(battery->device->handle, "_BTP", &handle); 397 if (ACPI_FAILURE(status)) { 398 battery->alarm_present = 0; 399 return 0; 400 } 401 battery->alarm_present = 1; 402 if (!battery->alarm) 403 battery->alarm = battery->design_capacity_warning; 404 return acpi_battery_set_alarm(battery); 405 } 406 407 #ifdef CONFIG_ACPI_SYSFS_POWER 408 static ssize_t acpi_battery_alarm_show(struct device *dev, 409 struct device_attribute *attr, 410 char *buf) 411 { 412 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 413 return sprintf(buf, "%d\n", battery->alarm * 1000); 414 } 415 416 static ssize_t acpi_battery_alarm_store(struct device *dev, 417 struct device_attribute *attr, 418 const char *buf, size_t count) 419 { 420 unsigned long x; 421 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 422 if (sscanf(buf, "%ld\n", &x) == 1) 423 battery->alarm = x/1000; 424 if (acpi_battery_present(battery)) 425 acpi_battery_set_alarm(battery); 426 return count; 427 } 428 429 static struct device_attribute alarm_attr = { 430 .attr = {.name = "alarm", .mode = 0644, .owner = THIS_MODULE}, 431 .show = acpi_battery_alarm_show, 432 .store = acpi_battery_alarm_store, 433 }; 434 435 static int sysfs_add_battery(struct acpi_battery *battery) 436 { 437 int result; 438 439 if (battery->power_unit) { 440 battery->bat.properties = charge_battery_props; 441 battery->bat.num_properties = 442 ARRAY_SIZE(charge_battery_props); 443 } else { 444 battery->bat.properties = energy_battery_props; 445 battery->bat.num_properties = 446 ARRAY_SIZE(energy_battery_props); 447 } 448 449 battery->bat.name = acpi_device_bid(battery->device); 450 battery->bat.type = POWER_SUPPLY_TYPE_BATTERY; 451 battery->bat.get_property = acpi_battery_get_property; 452 453 result = power_supply_register(&battery->device->dev, &battery->bat); 454 if (result) 455 return result; 456 return device_create_file(battery->bat.dev, &alarm_attr); 457 } 458 459 static void sysfs_remove_battery(struct acpi_battery *battery) 460 { 461 if (!battery->bat.dev) 462 return; 463 device_remove_file(battery->bat.dev, &alarm_attr); 464 power_supply_unregister(&battery->bat); 465 battery->bat.dev = NULL; 466 } 467 #endif 468 469 static int acpi_battery_update(struct acpi_battery *battery) 470 { 471 int result; 472 result = acpi_battery_get_status(battery); 473 if (result) 474 return result; 475 #ifdef CONFIG_ACPI_SYSFS_POWER 476 if (!acpi_battery_present(battery)) { 477 sysfs_remove_battery(battery); 478 battery->update_time = 0; 479 return 0; 480 } 481 #endif 482 if (!battery->update_time) { 483 result = acpi_battery_get_info(battery); 484 if (result) 485 return result; 486 acpi_battery_init_alarm(battery); 487 } 488 #ifdef CONFIG_ACPI_SYSFS_POWER 489 if (!battery->bat.dev) 490 sysfs_add_battery(battery); 491 #endif 492 return acpi_battery_get_state(battery); 493 } 494 495 /* -------------------------------------------------------------------------- 496 FS Interface (/proc) 497 -------------------------------------------------------------------------- */ 498 499 #ifdef CONFIG_ACPI_PROCFS_POWER 500 static struct proc_dir_entry *acpi_battery_dir; 501 502 static int acpi_battery_print_info(struct seq_file *seq, int result) 503 { 504 struct acpi_battery *battery = seq->private; 505 506 if (result) 507 goto end; 508 509 seq_printf(seq, "present: %s\n", 510 acpi_battery_present(battery)?"yes":"no"); 511 if (!acpi_battery_present(battery)) 512 goto end; 513 if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 514 seq_printf(seq, "design capacity: unknown\n"); 515 else 516 seq_printf(seq, "design capacity: %d %sh\n", 517 battery->design_capacity, 518 acpi_battery_units(battery)); 519 520 if (battery->full_charge_capacity == ACPI_BATTERY_VALUE_UNKNOWN) 521 seq_printf(seq, "last full capacity: unknown\n"); 522 else 523 seq_printf(seq, "last full capacity: %d %sh\n", 524 battery->full_charge_capacity, 525 acpi_battery_units(battery)); 526 527 seq_printf(seq, "battery technology: %srechargeable\n", 528 (!battery->technology)?"non-":""); 529 530 if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN) 531 seq_printf(seq, "design voltage: unknown\n"); 532 else 533 seq_printf(seq, "design voltage: %d mV\n", 534 battery->design_voltage); 535 seq_printf(seq, "design capacity warning: %d %sh\n", 536 battery->design_capacity_warning, 537 acpi_battery_units(battery)); 538 seq_printf(seq, "design capacity low: %d %sh\n", 539 battery->design_capacity_low, 540 acpi_battery_units(battery)); 541 seq_printf(seq, "capacity granularity 1: %d %sh\n", 542 battery->capacity_granularity_1, 543 acpi_battery_units(battery)); 544 seq_printf(seq, "capacity granularity 2: %d %sh\n", 545 battery->capacity_granularity_2, 546 acpi_battery_units(battery)); 547 seq_printf(seq, "model number: %s\n", battery->model_number); 548 seq_printf(seq, "serial number: %s\n", battery->serial_number); 549 seq_printf(seq, "battery type: %s\n", battery->type); 550 seq_printf(seq, "OEM info: %s\n", battery->oem_info); 551 end: 552 if (result) 553 seq_printf(seq, "ERROR: Unable to read battery info\n"); 554 return result; 555 } 556 557 static int acpi_battery_print_state(struct seq_file *seq, int result) 558 { 559 struct acpi_battery *battery = seq->private; 560 561 if (result) 562 goto end; 563 564 seq_printf(seq, "present: %s\n", 565 acpi_battery_present(battery)?"yes":"no"); 566 if (!acpi_battery_present(battery)) 567 goto end; 568 569 seq_printf(seq, "capacity state: %s\n", 570 (battery->state & 0x04)?"critical":"ok"); 571 if ((battery->state & 0x01) && (battery->state & 0x02)) 572 seq_printf(seq, 573 "charging state: charging/discharging\n"); 574 else if (battery->state & 0x01) 575 seq_printf(seq, "charging state: discharging\n"); 576 else if (battery->state & 0x02) 577 seq_printf(seq, "charging state: charging\n"); 578 else 579 seq_printf(seq, "charging state: charged\n"); 580 581 if (battery->current_now == ACPI_BATTERY_VALUE_UNKNOWN) 582 seq_printf(seq, "present rate: unknown\n"); 583 else 584 seq_printf(seq, "present rate: %d %s\n", 585 battery->current_now, acpi_battery_units(battery)); 586 587 if (battery->capacity_now == ACPI_BATTERY_VALUE_UNKNOWN) 588 seq_printf(seq, "remaining capacity: unknown\n"); 589 else 590 seq_printf(seq, "remaining capacity: %d %sh\n", 591 battery->capacity_now, acpi_battery_units(battery)); 592 if (battery->voltage_now == ACPI_BATTERY_VALUE_UNKNOWN) 593 seq_printf(seq, "present voltage: unknown\n"); 594 else 595 seq_printf(seq, "present voltage: %d mV\n", 596 battery->voltage_now); 597 end: 598 if (result) 599 seq_printf(seq, "ERROR: Unable to read battery state\n"); 600 601 return result; 602 } 603 604 static int acpi_battery_print_alarm(struct seq_file *seq, int result) 605 { 606 struct acpi_battery *battery = seq->private; 607 608 if (result) 609 goto end; 610 611 if (!acpi_battery_present(battery)) { 612 seq_printf(seq, "present: no\n"); 613 goto end; 614 } 615 seq_printf(seq, "alarm: "); 616 if (!battery->alarm) 617 seq_printf(seq, "unsupported\n"); 618 else 619 seq_printf(seq, "%u %sh\n", battery->alarm, 620 acpi_battery_units(battery)); 621 end: 622 if (result) 623 seq_printf(seq, "ERROR: Unable to read battery alarm\n"); 624 return result; 625 } 626 627 static ssize_t acpi_battery_write_alarm(struct file *file, 628 const char __user * buffer, 629 size_t count, loff_t * ppos) 630 { 631 int result = 0; 632 char alarm_string[12] = { '\0' }; 633 struct seq_file *m = file->private_data; 634 struct acpi_battery *battery = m->private; 635 636 if (!battery || (count > sizeof(alarm_string) - 1)) 637 return -EINVAL; 638 if (!acpi_battery_present(battery)) { 639 result = -ENODEV; 640 goto end; 641 } 642 if (copy_from_user(alarm_string, buffer, count)) { 643 result = -EFAULT; 644 goto end; 645 } 646 alarm_string[count] = '\0'; 647 battery->alarm = simple_strtol(alarm_string, NULL, 0); 648 result = acpi_battery_set_alarm(battery); 649 end: 650 if (!result) 651 return count; 652 return result; 653 } 654 655 typedef int(*print_func)(struct seq_file *seq, int result); 656 657 static print_func acpi_print_funcs[ACPI_BATTERY_NUMFILES] = { 658 acpi_battery_print_info, 659 acpi_battery_print_state, 660 acpi_battery_print_alarm, 661 }; 662 663 static int acpi_battery_read(int fid, struct seq_file *seq) 664 { 665 struct acpi_battery *battery = seq->private; 666 int result = acpi_battery_update(battery); 667 return acpi_print_funcs[fid](seq, result); 668 } 669 670 #define DECLARE_FILE_FUNCTIONS(_name) \ 671 static int acpi_battery_read_##_name(struct seq_file *seq, void *offset) \ 672 { \ 673 return acpi_battery_read(_name##_tag, seq); \ 674 } \ 675 static int acpi_battery_##_name##_open_fs(struct inode *inode, struct file *file) \ 676 { \ 677 return single_open(file, acpi_battery_read_##_name, PDE(inode)->data); \ 678 } 679 680 DECLARE_FILE_FUNCTIONS(info); 681 DECLARE_FILE_FUNCTIONS(state); 682 DECLARE_FILE_FUNCTIONS(alarm); 683 684 #undef DECLARE_FILE_FUNCTIONS 685 686 #define FILE_DESCRIPTION_RO(_name) \ 687 { \ 688 .name = __stringify(_name), \ 689 .mode = S_IRUGO, \ 690 .ops = { \ 691 .open = acpi_battery_##_name##_open_fs, \ 692 .read = seq_read, \ 693 .llseek = seq_lseek, \ 694 .release = single_release, \ 695 .owner = THIS_MODULE, \ 696 }, \ 697 } 698 699 #define FILE_DESCRIPTION_RW(_name) \ 700 { \ 701 .name = __stringify(_name), \ 702 .mode = S_IFREG | S_IRUGO | S_IWUSR, \ 703 .ops = { \ 704 .open = acpi_battery_##_name##_open_fs, \ 705 .read = seq_read, \ 706 .llseek = seq_lseek, \ 707 .write = acpi_battery_write_##_name, \ 708 .release = single_release, \ 709 .owner = THIS_MODULE, \ 710 }, \ 711 } 712 713 static struct battery_file { 714 struct file_operations ops; 715 mode_t mode; 716 char *name; 717 } acpi_battery_file[] = { 718 FILE_DESCRIPTION_RO(info), 719 FILE_DESCRIPTION_RO(state), 720 FILE_DESCRIPTION_RW(alarm), 721 }; 722 723 #undef FILE_DESCRIPTION_RO 724 #undef FILE_DESCRIPTION_RW 725 726 static int acpi_battery_add_fs(struct acpi_device *device) 727 { 728 struct proc_dir_entry *entry = NULL; 729 int i; 730 731 if (!acpi_device_dir(device)) { 732 acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), 733 acpi_battery_dir); 734 if (!acpi_device_dir(device)) 735 return -ENODEV; 736 acpi_device_dir(device)->owner = THIS_MODULE; 737 } 738 739 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) { 740 entry = create_proc_entry(acpi_battery_file[i].name, 741 acpi_battery_file[i].mode, acpi_device_dir(device)); 742 if (!entry) 743 return -ENODEV; 744 else { 745 entry->proc_fops = &acpi_battery_file[i].ops; 746 entry->data = acpi_driver_data(device); 747 entry->owner = THIS_MODULE; 748 } 749 } 750 return 0; 751 } 752 753 static void acpi_battery_remove_fs(struct acpi_device *device) 754 { 755 int i; 756 if (!acpi_device_dir(device)) 757 return; 758 for (i = 0; i < ACPI_BATTERY_NUMFILES; ++i) 759 remove_proc_entry(acpi_battery_file[i].name, 760 acpi_device_dir(device)); 761 762 remove_proc_entry(acpi_device_bid(device), acpi_battery_dir); 763 acpi_device_dir(device) = NULL; 764 } 765 766 #endif 767 768 /* -------------------------------------------------------------------------- 769 Driver Interface 770 -------------------------------------------------------------------------- */ 771 772 static void acpi_battery_notify(acpi_handle handle, u32 event, void *data) 773 { 774 struct acpi_battery *battery = data; 775 struct acpi_device *device; 776 if (!battery) 777 return; 778 device = battery->device; 779 acpi_battery_update(battery); 780 acpi_bus_generate_proc_event(device, event, 781 acpi_battery_present(battery)); 782 acpi_bus_generate_netlink_event(device->pnp.device_class, 783 device->dev.bus_id, event, 784 acpi_battery_present(battery)); 785 #ifdef CONFIG_ACPI_SYSFS_POWER 786 /* acpi_batter_update could remove power_supply object */ 787 if (battery->bat.dev) 788 kobject_uevent(&battery->bat.dev->kobj, KOBJ_CHANGE); 789 #endif 790 } 791 792 static int acpi_battery_add(struct acpi_device *device) 793 { 794 int result = 0; 795 acpi_status status = 0; 796 struct acpi_battery *battery = NULL; 797 if (!device) 798 return -EINVAL; 799 battery = kzalloc(sizeof(struct acpi_battery), GFP_KERNEL); 800 if (!battery) 801 return -ENOMEM; 802 battery->device = device; 803 strcpy(acpi_device_name(device), ACPI_BATTERY_DEVICE_NAME); 804 strcpy(acpi_device_class(device), ACPI_BATTERY_CLASS); 805 acpi_driver_data(device) = battery; 806 mutex_init(&battery->lock); 807 acpi_battery_update(battery); 808 #ifdef CONFIG_ACPI_PROCFS_POWER 809 result = acpi_battery_add_fs(device); 810 if (result) 811 goto end; 812 #endif 813 status = acpi_install_notify_handler(device->handle, 814 ACPI_ALL_NOTIFY, 815 acpi_battery_notify, battery); 816 if (ACPI_FAILURE(status)) { 817 ACPI_EXCEPTION((AE_INFO, status, "Installing notify handler")); 818 result = -ENODEV; 819 goto end; 820 } 821 printk(KERN_INFO PREFIX "%s Slot [%s] (battery %s)\n", 822 ACPI_BATTERY_DEVICE_NAME, acpi_device_bid(device), 823 device->status.battery_present ? "present" : "absent"); 824 end: 825 if (result) { 826 #ifdef CONFIG_ACPI_PROCFS_POWER 827 acpi_battery_remove_fs(device); 828 #endif 829 kfree(battery); 830 } 831 return result; 832 } 833 834 static int acpi_battery_remove(struct acpi_device *device, int type) 835 { 836 acpi_status status = 0; 837 struct acpi_battery *battery = NULL; 838 839 if (!device || !acpi_driver_data(device)) 840 return -EINVAL; 841 battery = acpi_driver_data(device); 842 status = acpi_remove_notify_handler(device->handle, 843 ACPI_ALL_NOTIFY, 844 acpi_battery_notify); 845 #ifdef CONFIG_ACPI_PROCFS_POWER 846 acpi_battery_remove_fs(device); 847 #endif 848 #ifdef CONFIG_ACPI_SYSFS_POWER 849 sysfs_remove_battery(battery); 850 #endif 851 mutex_destroy(&battery->lock); 852 kfree(battery); 853 return 0; 854 } 855 856 /* this is needed to learn about changes made in suspended state */ 857 static int acpi_battery_resume(struct acpi_device *device) 858 { 859 struct acpi_battery *battery; 860 if (!device) 861 return -EINVAL; 862 battery = acpi_driver_data(device); 863 battery->update_time = 0; 864 acpi_battery_update(battery); 865 return 0; 866 } 867 868 static struct acpi_driver acpi_battery_driver = { 869 .name = "battery", 870 .class = ACPI_BATTERY_CLASS, 871 .ids = battery_device_ids, 872 .ops = { 873 .add = acpi_battery_add, 874 .resume = acpi_battery_resume, 875 .remove = acpi_battery_remove, 876 }, 877 }; 878 879 static int __init acpi_battery_init(void) 880 { 881 if (acpi_disabled) 882 return -ENODEV; 883 #ifdef CONFIG_ACPI_PROCFS_POWER 884 acpi_battery_dir = acpi_lock_battery_dir(); 885 if (!acpi_battery_dir) 886 return -ENODEV; 887 #endif 888 if (acpi_bus_register_driver(&acpi_battery_driver) < 0) { 889 #ifdef CONFIG_ACPI_PROCFS_POWER 890 acpi_unlock_battery_dir(acpi_battery_dir); 891 #endif 892 return -ENODEV; 893 } 894 return 0; 895 } 896 897 static void __exit acpi_battery_exit(void) 898 { 899 acpi_bus_unregister_driver(&acpi_battery_driver); 900 #ifdef CONFIG_ACPI_PROCFS_POWER 901 acpi_unlock_battery_dir(acpi_battery_dir); 902 #endif 903 } 904 905 module_init(acpi_battery_init); 906 module_exit(acpi_battery_exit); 907