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