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