1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $) 4 * 5 * Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de> 6 * Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com> 7 * Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu> 8 */ 9 10 #include <linux/init.h> 11 #include <linux/slab.h> 12 #include <linux/module.h> 13 #include <linux/moduleparam.h> 14 #include <linux/kernel.h> 15 16 #include <linux/acpi.h> 17 #include <linux/timer.h> 18 #include <linux/jiffies.h> 19 #include <linux/delay.h> 20 #include <linux/power_supply.h> 21 #include <linux/platform_data/x86/apple.h> 22 #include <acpi/battery.h> 23 24 #include "sbshc.h" 25 26 #define PREFIX "ACPI: " 27 28 #define ACPI_SBS_CLASS "sbs" 29 #define ACPI_AC_CLASS "ac_adapter" 30 #define ACPI_SBS_DEVICE_NAME "Smart Battery System" 31 #define ACPI_SBS_FILE_INFO "info" 32 #define ACPI_SBS_FILE_STATE "state" 33 #define ACPI_SBS_FILE_ALARM "alarm" 34 #define ACPI_BATTERY_DIR_NAME "BAT%i" 35 #define ACPI_AC_DIR_NAME "AC0" 36 37 #define ACPI_SBS_NOTIFY_STATUS 0x80 38 #define ACPI_SBS_NOTIFY_INFO 0x81 39 40 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 41 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver"); 42 MODULE_LICENSE("GPL"); 43 44 static unsigned int cache_time = 1000; 45 module_param(cache_time, uint, 0644); 46 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 47 48 #define MAX_SBS_BAT 4 49 #define ACPI_SBS_BLOCK_MAX 32 50 51 static const struct acpi_device_id sbs_device_ids[] = { 52 {"ACPI0002", 0}, 53 {"", 0}, 54 }; 55 MODULE_DEVICE_TABLE(acpi, sbs_device_ids); 56 57 struct acpi_battery { 58 struct power_supply *bat; 59 struct power_supply_desc bat_desc; 60 struct acpi_sbs *sbs; 61 unsigned long update_time; 62 char name[8]; 63 char manufacturer_name[ACPI_SBS_BLOCK_MAX]; 64 char device_name[ACPI_SBS_BLOCK_MAX]; 65 char device_chemistry[ACPI_SBS_BLOCK_MAX]; 66 u16 alarm_capacity; 67 u16 full_charge_capacity; 68 u16 design_capacity; 69 u16 design_voltage; 70 u16 serial_number; 71 u16 cycle_count; 72 u16 temp_now; 73 u16 voltage_now; 74 s16 rate_now; 75 s16 rate_avg; 76 u16 capacity_now; 77 u16 state_of_charge; 78 u16 state; 79 u16 mode; 80 u16 spec; 81 u8 id; 82 u8 present:1; 83 u8 have_sysfs_alarm:1; 84 }; 85 86 #define to_acpi_battery(x) power_supply_get_drvdata(x) 87 88 struct acpi_sbs { 89 struct power_supply *charger; 90 struct acpi_device *device; 91 struct acpi_smb_hc *hc; 92 struct mutex lock; 93 struct acpi_battery battery[MAX_SBS_BAT]; 94 u8 batteries_supported:4; 95 u8 manager_present:1; 96 u8 charger_present:1; 97 u8 charger_exists:1; 98 }; 99 100 #define to_acpi_sbs(x) power_supply_get_drvdata(x) 101 102 static int acpi_sbs_remove(struct acpi_device *device); 103 static int acpi_battery_get_state(struct acpi_battery *battery); 104 105 static inline int battery_scale(int log) 106 { 107 int scale = 1; 108 while (log--) 109 scale *= 10; 110 return scale; 111 } 112 113 static inline int acpi_battery_vscale(struct acpi_battery *battery) 114 { 115 return battery_scale((battery->spec & 0x0f00) >> 8); 116 } 117 118 static inline int acpi_battery_ipscale(struct acpi_battery *battery) 119 { 120 return battery_scale((battery->spec & 0xf000) >> 12); 121 } 122 123 static inline int acpi_battery_mode(struct acpi_battery *battery) 124 { 125 return (battery->mode & 0x8000); 126 } 127 128 static inline int acpi_battery_scale(struct acpi_battery *battery) 129 { 130 return (acpi_battery_mode(battery) ? 10 : 1) * 131 acpi_battery_ipscale(battery); 132 } 133 134 static int sbs_get_ac_property(struct power_supply *psy, 135 enum power_supply_property psp, 136 union power_supply_propval *val) 137 { 138 struct acpi_sbs *sbs = to_acpi_sbs(psy); 139 switch (psp) { 140 case POWER_SUPPLY_PROP_ONLINE: 141 val->intval = sbs->charger_present; 142 break; 143 default: 144 return -EINVAL; 145 } 146 return 0; 147 } 148 149 static int acpi_battery_technology(struct acpi_battery *battery) 150 { 151 if (!strcasecmp("NiCd", battery->device_chemistry)) 152 return POWER_SUPPLY_TECHNOLOGY_NiCd; 153 if (!strcasecmp("NiMH", battery->device_chemistry)) 154 return POWER_SUPPLY_TECHNOLOGY_NiMH; 155 if (!strcasecmp("LION", battery->device_chemistry)) 156 return POWER_SUPPLY_TECHNOLOGY_LION; 157 if (!strcasecmp("LiP", battery->device_chemistry)) 158 return POWER_SUPPLY_TECHNOLOGY_LIPO; 159 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 160 } 161 162 static int acpi_sbs_battery_get_property(struct power_supply *psy, 163 enum power_supply_property psp, 164 union power_supply_propval *val) 165 { 166 struct acpi_battery *battery = to_acpi_battery(psy); 167 168 if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT) 169 return -ENODEV; 170 171 acpi_battery_get_state(battery); 172 switch (psp) { 173 case POWER_SUPPLY_PROP_STATUS: 174 if (battery->rate_now < 0) 175 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 176 else if (battery->rate_now > 0) 177 val->intval = POWER_SUPPLY_STATUS_CHARGING; 178 else 179 val->intval = POWER_SUPPLY_STATUS_FULL; 180 break; 181 case POWER_SUPPLY_PROP_PRESENT: 182 val->intval = battery->present; 183 break; 184 case POWER_SUPPLY_PROP_TECHNOLOGY: 185 val->intval = acpi_battery_technology(battery); 186 break; 187 case POWER_SUPPLY_PROP_CYCLE_COUNT: 188 val->intval = battery->cycle_count; 189 break; 190 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 191 val->intval = battery->design_voltage * 192 acpi_battery_vscale(battery) * 1000; 193 break; 194 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 195 val->intval = battery->voltage_now * 196 acpi_battery_vscale(battery) * 1000; 197 break; 198 case POWER_SUPPLY_PROP_CURRENT_NOW: 199 case POWER_SUPPLY_PROP_POWER_NOW: 200 val->intval = abs(battery->rate_now) * 201 acpi_battery_ipscale(battery) * 1000; 202 val->intval *= (acpi_battery_mode(battery)) ? 203 (battery->voltage_now * 204 acpi_battery_vscale(battery) / 1000) : 1; 205 break; 206 case POWER_SUPPLY_PROP_CURRENT_AVG: 207 case POWER_SUPPLY_PROP_POWER_AVG: 208 val->intval = abs(battery->rate_avg) * 209 acpi_battery_ipscale(battery) * 1000; 210 val->intval *= (acpi_battery_mode(battery)) ? 211 (battery->voltage_now * 212 acpi_battery_vscale(battery) / 1000) : 1; 213 break; 214 case POWER_SUPPLY_PROP_CAPACITY: 215 val->intval = battery->state_of_charge; 216 break; 217 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 218 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 219 val->intval = battery->design_capacity * 220 acpi_battery_scale(battery) * 1000; 221 break; 222 case POWER_SUPPLY_PROP_CHARGE_FULL: 223 case POWER_SUPPLY_PROP_ENERGY_FULL: 224 val->intval = battery->full_charge_capacity * 225 acpi_battery_scale(battery) * 1000; 226 break; 227 case POWER_SUPPLY_PROP_CHARGE_NOW: 228 case POWER_SUPPLY_PROP_ENERGY_NOW: 229 val->intval = battery->capacity_now * 230 acpi_battery_scale(battery) * 1000; 231 break; 232 case POWER_SUPPLY_PROP_TEMP: 233 val->intval = battery->temp_now - 2730; // dK -> dC 234 break; 235 case POWER_SUPPLY_PROP_MODEL_NAME: 236 val->strval = battery->device_name; 237 break; 238 case POWER_SUPPLY_PROP_MANUFACTURER: 239 val->strval = battery->manufacturer_name; 240 break; 241 default: 242 return -EINVAL; 243 } 244 return 0; 245 } 246 247 static enum power_supply_property sbs_ac_props[] = { 248 POWER_SUPPLY_PROP_ONLINE, 249 }; 250 251 static enum power_supply_property sbs_charge_battery_props[] = { 252 POWER_SUPPLY_PROP_STATUS, 253 POWER_SUPPLY_PROP_PRESENT, 254 POWER_SUPPLY_PROP_TECHNOLOGY, 255 POWER_SUPPLY_PROP_CYCLE_COUNT, 256 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 257 POWER_SUPPLY_PROP_VOLTAGE_NOW, 258 POWER_SUPPLY_PROP_CURRENT_NOW, 259 POWER_SUPPLY_PROP_CURRENT_AVG, 260 POWER_SUPPLY_PROP_CAPACITY, 261 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 262 POWER_SUPPLY_PROP_CHARGE_FULL, 263 POWER_SUPPLY_PROP_CHARGE_NOW, 264 POWER_SUPPLY_PROP_TEMP, 265 POWER_SUPPLY_PROP_MODEL_NAME, 266 POWER_SUPPLY_PROP_MANUFACTURER, 267 }; 268 269 static enum power_supply_property sbs_energy_battery_props[] = { 270 POWER_SUPPLY_PROP_STATUS, 271 POWER_SUPPLY_PROP_PRESENT, 272 POWER_SUPPLY_PROP_TECHNOLOGY, 273 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 274 POWER_SUPPLY_PROP_VOLTAGE_NOW, 275 POWER_SUPPLY_PROP_CURRENT_NOW, 276 POWER_SUPPLY_PROP_CURRENT_AVG, 277 POWER_SUPPLY_PROP_POWER_NOW, 278 POWER_SUPPLY_PROP_POWER_AVG, 279 POWER_SUPPLY_PROP_CAPACITY, 280 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 281 POWER_SUPPLY_PROP_ENERGY_FULL, 282 POWER_SUPPLY_PROP_ENERGY_NOW, 283 POWER_SUPPLY_PROP_TEMP, 284 POWER_SUPPLY_PROP_MODEL_NAME, 285 POWER_SUPPLY_PROP_MANUFACTURER, 286 }; 287 288 static const struct power_supply_desc acpi_sbs_charger_desc = { 289 .name = "sbs-charger", 290 .type = POWER_SUPPLY_TYPE_MAINS, 291 .properties = sbs_ac_props, 292 .num_properties = ARRAY_SIZE(sbs_ac_props), 293 .get_property = sbs_get_ac_property, 294 }; 295 296 /* -------------------------------------------------------------------------- 297 Smart Battery System Management 298 -------------------------------------------------------------------------- */ 299 300 struct acpi_battery_reader { 301 u8 command; /* command for battery */ 302 u8 mode; /* word or block? */ 303 size_t offset; /* offset inside struct acpi_sbs_battery */ 304 }; 305 306 static struct acpi_battery_reader info_readers[] = { 307 {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)}, 308 {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)}, 309 {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)}, 310 {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)}, 311 {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)}, 312 {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)}, 313 {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)}, 314 {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)}, 315 {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)}, 316 {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)}, 317 {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)}, 318 }; 319 320 static struct acpi_battery_reader state_readers[] = { 321 {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)}, 322 {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)}, 323 {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)}, 324 {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)}, 325 {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)}, 326 {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)}, 327 {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)}, 328 }; 329 330 static int acpi_manager_get_info(struct acpi_sbs *sbs) 331 { 332 int result = 0; 333 u16 battery_system_info; 334 335 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER, 336 0x04, (u8 *)&battery_system_info); 337 if (!result) 338 sbs->batteries_supported = battery_system_info & 0x000f; 339 return result; 340 } 341 342 static int acpi_battery_get_info(struct acpi_battery *battery) 343 { 344 int i, result = 0; 345 346 for (i = 0; i < ARRAY_SIZE(info_readers); ++i) { 347 result = acpi_smbus_read(battery->sbs->hc, 348 info_readers[i].mode, 349 ACPI_SBS_BATTERY, 350 info_readers[i].command, 351 (u8 *) battery + 352 info_readers[i].offset); 353 if (result) 354 break; 355 } 356 return result; 357 } 358 359 static int acpi_battery_get_state(struct acpi_battery *battery) 360 { 361 int i, result = 0; 362 363 if (battery->update_time && 364 time_before(jiffies, battery->update_time + 365 msecs_to_jiffies(cache_time))) 366 return 0; 367 for (i = 0; i < ARRAY_SIZE(state_readers); ++i) { 368 result = acpi_smbus_read(battery->sbs->hc, 369 state_readers[i].mode, 370 ACPI_SBS_BATTERY, 371 state_readers[i].command, 372 (u8 *)battery + 373 state_readers[i].offset); 374 if (result) 375 goto end; 376 } 377 end: 378 battery->update_time = jiffies; 379 return result; 380 } 381 382 static int acpi_battery_get_alarm(struct acpi_battery *battery) 383 { 384 return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, 385 ACPI_SBS_BATTERY, 0x01, 386 (u8 *)&battery->alarm_capacity); 387 } 388 389 static int acpi_battery_set_alarm(struct acpi_battery *battery) 390 { 391 struct acpi_sbs *sbs = battery->sbs; 392 u16 value, sel = 1 << (battery->id + 12); 393 394 int ret; 395 396 397 if (sbs->manager_present) { 398 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER, 399 0x01, (u8 *)&value); 400 if (ret) 401 goto end; 402 if ((value & 0xf000) != sel) { 403 value &= 0x0fff; 404 value |= sel; 405 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, 406 ACPI_SBS_MANAGER, 407 0x01, (u8 *)&value, 2); 408 if (ret) 409 goto end; 410 } 411 } 412 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY, 413 0x01, (u8 *)&battery->alarm_capacity, 2); 414 end: 415 return ret; 416 } 417 418 static int acpi_ac_get_present(struct acpi_sbs *sbs) 419 { 420 int result; 421 u16 status; 422 423 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER, 424 0x13, (u8 *) & status); 425 426 if (result) 427 return result; 428 429 /* 430 * The spec requires that bit 4 always be 1. If it's not set, assume 431 * that the implementation doesn't support an SBS charger. 432 * 433 * And on some MacBooks a status of 0xffff is always returned, no 434 * matter whether the charger is plugged in or not, which is also 435 * wrong, so ignore the SBS charger for those too. 436 */ 437 if (!((status >> 4) & 0x1) || status == 0xffff) 438 return -ENODEV; 439 440 sbs->charger_present = (status >> 15) & 0x1; 441 return 0; 442 } 443 444 static ssize_t acpi_battery_alarm_show(struct device *dev, 445 struct device_attribute *attr, 446 char *buf) 447 { 448 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 449 acpi_battery_get_alarm(battery); 450 return sprintf(buf, "%d\n", battery->alarm_capacity * 451 acpi_battery_scale(battery) * 1000); 452 } 453 454 static ssize_t acpi_battery_alarm_store(struct device *dev, 455 struct device_attribute *attr, 456 const char *buf, size_t count) 457 { 458 unsigned long x; 459 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 460 if (sscanf(buf, "%lu\n", &x) == 1) 461 battery->alarm_capacity = x / 462 (1000 * acpi_battery_scale(battery)); 463 if (battery->present) 464 acpi_battery_set_alarm(battery); 465 return count; 466 } 467 468 static const struct device_attribute alarm_attr = { 469 .attr = {.name = "alarm", .mode = 0644}, 470 .show = acpi_battery_alarm_show, 471 .store = acpi_battery_alarm_store, 472 }; 473 474 /* -------------------------------------------------------------------------- 475 Driver Interface 476 -------------------------------------------------------------------------- */ 477 static int acpi_battery_read(struct acpi_battery *battery) 478 { 479 int result = 0, saved_present = battery->present; 480 u16 state; 481 482 if (battery->sbs->manager_present) { 483 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, 484 ACPI_SBS_MANAGER, 0x01, (u8 *)&state); 485 if (!result) 486 battery->present = state & (1 << battery->id); 487 state &= 0x0fff; 488 state |= 1 << (battery->id + 12); 489 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD, 490 ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2); 491 } else if (battery->id == 0) 492 battery->present = 1; 493 494 if (result || !battery->present) 495 return result; 496 497 if (saved_present != battery->present) { 498 battery->update_time = 0; 499 result = acpi_battery_get_info(battery); 500 if (result) { 501 battery->present = 0; 502 return result; 503 } 504 } 505 result = acpi_battery_get_state(battery); 506 if (result) 507 battery->present = 0; 508 return result; 509 } 510 511 /* Smart Battery */ 512 static int acpi_battery_add(struct acpi_sbs *sbs, int id) 513 { 514 struct acpi_battery *battery = &sbs->battery[id]; 515 struct power_supply_config psy_cfg = { .drv_data = battery, }; 516 int result; 517 518 battery->id = id; 519 battery->sbs = sbs; 520 result = acpi_battery_read(battery); 521 if (result) 522 return result; 523 524 sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id); 525 battery->bat_desc.name = battery->name; 526 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 527 if (!acpi_battery_mode(battery)) { 528 battery->bat_desc.properties = sbs_charge_battery_props; 529 battery->bat_desc.num_properties = 530 ARRAY_SIZE(sbs_charge_battery_props); 531 } else { 532 battery->bat_desc.properties = sbs_energy_battery_props; 533 battery->bat_desc.num_properties = 534 ARRAY_SIZE(sbs_energy_battery_props); 535 } 536 battery->bat_desc.get_property = acpi_sbs_battery_get_property; 537 battery->bat = power_supply_register(&sbs->device->dev, 538 &battery->bat_desc, &psy_cfg); 539 if (IS_ERR(battery->bat)) { 540 result = PTR_ERR(battery->bat); 541 battery->bat = NULL; 542 goto end; 543 } 544 545 result = device_create_file(&battery->bat->dev, &alarm_attr); 546 if (result) 547 goto end; 548 battery->have_sysfs_alarm = 1; 549 end: 550 printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n", 551 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device), 552 battery->name, battery->present ? "present" : "absent"); 553 return result; 554 } 555 556 static void acpi_battery_remove(struct acpi_sbs *sbs, int id) 557 { 558 struct acpi_battery *battery = &sbs->battery[id]; 559 560 if (battery->bat) { 561 if (battery->have_sysfs_alarm) 562 device_remove_file(&battery->bat->dev, &alarm_attr); 563 power_supply_unregister(battery->bat); 564 } 565 } 566 567 static int acpi_charger_add(struct acpi_sbs *sbs) 568 { 569 int result; 570 struct power_supply_config psy_cfg = { .drv_data = sbs, }; 571 572 result = acpi_ac_get_present(sbs); 573 if (result) 574 goto end; 575 576 sbs->charger_exists = 1; 577 sbs->charger = power_supply_register(&sbs->device->dev, 578 &acpi_sbs_charger_desc, &psy_cfg); 579 if (IS_ERR(sbs->charger)) { 580 result = PTR_ERR(sbs->charger); 581 sbs->charger = NULL; 582 } 583 printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n", 584 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device), 585 ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line"); 586 end: 587 return result; 588 } 589 590 static void acpi_charger_remove(struct acpi_sbs *sbs) 591 { 592 if (sbs->charger) 593 power_supply_unregister(sbs->charger); 594 } 595 596 static void acpi_sbs_callback(void *context) 597 { 598 int id; 599 struct acpi_sbs *sbs = context; 600 struct acpi_battery *bat; 601 u8 saved_charger_state = sbs->charger_present; 602 u8 saved_battery_state; 603 604 if (sbs->charger_exists) { 605 acpi_ac_get_present(sbs); 606 if (sbs->charger_present != saved_charger_state) 607 kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE); 608 } 609 610 if (sbs->manager_present) { 611 for (id = 0; id < MAX_SBS_BAT; ++id) { 612 if (!(sbs->batteries_supported & (1 << id))) 613 continue; 614 bat = &sbs->battery[id]; 615 saved_battery_state = bat->present; 616 acpi_battery_read(bat); 617 if (saved_battery_state == bat->present) 618 continue; 619 kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE); 620 } 621 } 622 } 623 624 static int acpi_sbs_add(struct acpi_device *device) 625 { 626 struct acpi_sbs *sbs; 627 int result = 0; 628 int id; 629 630 sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL); 631 if (!sbs) { 632 result = -ENOMEM; 633 goto end; 634 } 635 636 mutex_init(&sbs->lock); 637 638 sbs->hc = acpi_driver_data(device->parent); 639 sbs->device = device; 640 strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME); 641 strcpy(acpi_device_class(device), ACPI_SBS_CLASS); 642 device->driver_data = sbs; 643 644 result = acpi_charger_add(sbs); 645 if (result && result != -ENODEV) 646 goto end; 647 648 result = 0; 649 650 if (!x86_apple_machine) { 651 result = acpi_manager_get_info(sbs); 652 if (!result) { 653 sbs->manager_present = 1; 654 for (id = 0; id < MAX_SBS_BAT; ++id) 655 if ((sbs->batteries_supported & (1 << id))) 656 acpi_battery_add(sbs, id); 657 } 658 } 659 660 if (!sbs->manager_present) 661 acpi_battery_add(sbs, 0); 662 663 acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs); 664 end: 665 if (result) 666 acpi_sbs_remove(device); 667 return result; 668 } 669 670 static int acpi_sbs_remove(struct acpi_device *device) 671 { 672 struct acpi_sbs *sbs; 673 int id; 674 675 if (!device) 676 return -EINVAL; 677 sbs = acpi_driver_data(device); 678 if (!sbs) 679 return -EINVAL; 680 mutex_lock(&sbs->lock); 681 acpi_smbus_unregister_callback(sbs->hc); 682 for (id = 0; id < MAX_SBS_BAT; ++id) 683 acpi_battery_remove(sbs, id); 684 acpi_charger_remove(sbs); 685 mutex_unlock(&sbs->lock); 686 mutex_destroy(&sbs->lock); 687 kfree(sbs); 688 return 0; 689 } 690 691 #ifdef CONFIG_PM_SLEEP 692 static int acpi_sbs_resume(struct device *dev) 693 { 694 struct acpi_sbs *sbs; 695 if (!dev) 696 return -EINVAL; 697 sbs = to_acpi_device(dev)->driver_data; 698 acpi_sbs_callback(sbs); 699 return 0; 700 } 701 #else 702 #define acpi_sbs_resume NULL 703 #endif 704 705 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume); 706 707 static struct acpi_driver acpi_sbs_driver = { 708 .name = "sbs", 709 .class = ACPI_SBS_CLASS, 710 .ids = sbs_device_ids, 711 .ops = { 712 .add = acpi_sbs_add, 713 .remove = acpi_sbs_remove, 714 }, 715 .drv.pm = &acpi_sbs_pm, 716 }; 717 718 static int __init acpi_sbs_init(void) 719 { 720 int result = 0; 721 722 if (acpi_disabled) 723 return -ENODEV; 724 725 result = acpi_bus_register_driver(&acpi_sbs_driver); 726 if (result < 0) 727 return -ENODEV; 728 729 return 0; 730 } 731 732 static void __exit acpi_sbs_exit(void) 733 { 734 acpi_bus_unregister_driver(&acpi_sbs_driver); 735 return; 736 } 737 738 module_init(acpi_sbs_init); 739 module_exit(acpi_sbs_exit); 740