1 /* 2 * sbs.c - ACPI Smart Battery System Driver ($Revision: 2.0 $) 3 * 4 * Copyright (c) 2007 Alexey Starikovskiy <astarikovskiy@suse.de> 5 * Copyright (c) 2005-2007 Vladimir Lebedev <vladimir.p.lebedev@intel.com> 6 * Copyright (c) 2005 Rich Townsend <rhdt@bartol.udel.edu> 7 * 8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or (at 13 * your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, but 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 21 */ 22 23 #include <linux/init.h> 24 #include <linux/slab.h> 25 #include <linux/module.h> 26 #include <linux/moduleparam.h> 27 #include <linux/kernel.h> 28 29 #include <linux/acpi.h> 30 #include <linux/timer.h> 31 #include <linux/jiffies.h> 32 #include <linux/delay.h> 33 #include <linux/power_supply.h> 34 #include <linux/platform_data/x86/apple.h> 35 #include <acpi/battery.h> 36 37 #include "sbshc.h" 38 39 #define PREFIX "ACPI: " 40 41 #define ACPI_SBS_CLASS "sbs" 42 #define ACPI_AC_CLASS "ac_adapter" 43 #define ACPI_SBS_DEVICE_NAME "Smart Battery System" 44 #define ACPI_SBS_FILE_INFO "info" 45 #define ACPI_SBS_FILE_STATE "state" 46 #define ACPI_SBS_FILE_ALARM "alarm" 47 #define ACPI_BATTERY_DIR_NAME "BAT%i" 48 #define ACPI_AC_DIR_NAME "AC0" 49 50 #define ACPI_SBS_NOTIFY_STATUS 0x80 51 #define ACPI_SBS_NOTIFY_INFO 0x81 52 53 MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@suse.de>"); 54 MODULE_DESCRIPTION("Smart Battery System ACPI interface driver"); 55 MODULE_LICENSE("GPL"); 56 57 static unsigned int cache_time = 1000; 58 module_param(cache_time, uint, 0644); 59 MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); 60 61 #define MAX_SBS_BAT 4 62 #define ACPI_SBS_BLOCK_MAX 32 63 64 static const struct acpi_device_id sbs_device_ids[] = { 65 {"ACPI0002", 0}, 66 {"", 0}, 67 }; 68 MODULE_DEVICE_TABLE(acpi, sbs_device_ids); 69 70 struct acpi_battery { 71 struct power_supply *bat; 72 struct power_supply_desc bat_desc; 73 struct acpi_sbs *sbs; 74 unsigned long update_time; 75 char name[8]; 76 char manufacturer_name[ACPI_SBS_BLOCK_MAX]; 77 char device_name[ACPI_SBS_BLOCK_MAX]; 78 char device_chemistry[ACPI_SBS_BLOCK_MAX]; 79 u16 alarm_capacity; 80 u16 full_charge_capacity; 81 u16 design_capacity; 82 u16 design_voltage; 83 u16 serial_number; 84 u16 cycle_count; 85 u16 temp_now; 86 u16 voltage_now; 87 s16 rate_now; 88 s16 rate_avg; 89 u16 capacity_now; 90 u16 state_of_charge; 91 u16 state; 92 u16 mode; 93 u16 spec; 94 u8 id; 95 u8 present:1; 96 u8 have_sysfs_alarm:1; 97 }; 98 99 #define to_acpi_battery(x) power_supply_get_drvdata(x) 100 101 struct acpi_sbs { 102 struct power_supply *charger; 103 struct acpi_device *device; 104 struct acpi_smb_hc *hc; 105 struct mutex lock; 106 struct acpi_battery battery[MAX_SBS_BAT]; 107 u8 batteries_supported:4; 108 u8 manager_present:1; 109 u8 charger_present:1; 110 u8 charger_exists:1; 111 }; 112 113 #define to_acpi_sbs(x) power_supply_get_drvdata(x) 114 115 static int acpi_sbs_remove(struct acpi_device *device); 116 static int acpi_battery_get_state(struct acpi_battery *battery); 117 118 static inline int battery_scale(int log) 119 { 120 int scale = 1; 121 while (log--) 122 scale *= 10; 123 return scale; 124 } 125 126 static inline int acpi_battery_vscale(struct acpi_battery *battery) 127 { 128 return battery_scale((battery->spec & 0x0f00) >> 8); 129 } 130 131 static inline int acpi_battery_ipscale(struct acpi_battery *battery) 132 { 133 return battery_scale((battery->spec & 0xf000) >> 12); 134 } 135 136 static inline int acpi_battery_mode(struct acpi_battery *battery) 137 { 138 return (battery->mode & 0x8000); 139 } 140 141 static inline int acpi_battery_scale(struct acpi_battery *battery) 142 { 143 return (acpi_battery_mode(battery) ? 10 : 1) * 144 acpi_battery_ipscale(battery); 145 } 146 147 static int sbs_get_ac_property(struct power_supply *psy, 148 enum power_supply_property psp, 149 union power_supply_propval *val) 150 { 151 struct acpi_sbs *sbs = to_acpi_sbs(psy); 152 switch (psp) { 153 case POWER_SUPPLY_PROP_ONLINE: 154 val->intval = sbs->charger_present; 155 break; 156 default: 157 return -EINVAL; 158 } 159 return 0; 160 } 161 162 static int acpi_battery_technology(struct acpi_battery *battery) 163 { 164 if (!strcasecmp("NiCd", battery->device_chemistry)) 165 return POWER_SUPPLY_TECHNOLOGY_NiCd; 166 if (!strcasecmp("NiMH", battery->device_chemistry)) 167 return POWER_SUPPLY_TECHNOLOGY_NiMH; 168 if (!strcasecmp("LION", battery->device_chemistry)) 169 return POWER_SUPPLY_TECHNOLOGY_LION; 170 if (!strcasecmp("LiP", battery->device_chemistry)) 171 return POWER_SUPPLY_TECHNOLOGY_LIPO; 172 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 173 } 174 175 static int acpi_sbs_battery_get_property(struct power_supply *psy, 176 enum power_supply_property psp, 177 union power_supply_propval *val) 178 { 179 struct acpi_battery *battery = to_acpi_battery(psy); 180 181 if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT) 182 return -ENODEV; 183 184 acpi_battery_get_state(battery); 185 switch (psp) { 186 case POWER_SUPPLY_PROP_STATUS: 187 if (battery->rate_now < 0) 188 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 189 else if (battery->rate_now > 0) 190 val->intval = POWER_SUPPLY_STATUS_CHARGING; 191 else 192 val->intval = POWER_SUPPLY_STATUS_FULL; 193 break; 194 case POWER_SUPPLY_PROP_PRESENT: 195 val->intval = battery->present; 196 break; 197 case POWER_SUPPLY_PROP_TECHNOLOGY: 198 val->intval = acpi_battery_technology(battery); 199 break; 200 case POWER_SUPPLY_PROP_CYCLE_COUNT: 201 val->intval = battery->cycle_count; 202 break; 203 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 204 val->intval = battery->design_voltage * 205 acpi_battery_vscale(battery) * 1000; 206 break; 207 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 208 val->intval = battery->voltage_now * 209 acpi_battery_vscale(battery) * 1000; 210 break; 211 case POWER_SUPPLY_PROP_CURRENT_NOW: 212 case POWER_SUPPLY_PROP_POWER_NOW: 213 val->intval = abs(battery->rate_now) * 214 acpi_battery_ipscale(battery) * 1000; 215 val->intval *= (acpi_battery_mode(battery)) ? 216 (battery->voltage_now * 217 acpi_battery_vscale(battery) / 1000) : 1; 218 break; 219 case POWER_SUPPLY_PROP_CURRENT_AVG: 220 case POWER_SUPPLY_PROP_POWER_AVG: 221 val->intval = abs(battery->rate_avg) * 222 acpi_battery_ipscale(battery) * 1000; 223 val->intval *= (acpi_battery_mode(battery)) ? 224 (battery->voltage_now * 225 acpi_battery_vscale(battery) / 1000) : 1; 226 break; 227 case POWER_SUPPLY_PROP_CAPACITY: 228 val->intval = battery->state_of_charge; 229 break; 230 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 231 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 232 val->intval = battery->design_capacity * 233 acpi_battery_scale(battery) * 1000; 234 break; 235 case POWER_SUPPLY_PROP_CHARGE_FULL: 236 case POWER_SUPPLY_PROP_ENERGY_FULL: 237 val->intval = battery->full_charge_capacity * 238 acpi_battery_scale(battery) * 1000; 239 break; 240 case POWER_SUPPLY_PROP_CHARGE_NOW: 241 case POWER_SUPPLY_PROP_ENERGY_NOW: 242 val->intval = battery->capacity_now * 243 acpi_battery_scale(battery) * 1000; 244 break; 245 case POWER_SUPPLY_PROP_TEMP: 246 val->intval = battery->temp_now - 2730; // dK -> dC 247 break; 248 case POWER_SUPPLY_PROP_MODEL_NAME: 249 val->strval = battery->device_name; 250 break; 251 case POWER_SUPPLY_PROP_MANUFACTURER: 252 val->strval = battery->manufacturer_name; 253 break; 254 default: 255 return -EINVAL; 256 } 257 return 0; 258 } 259 260 static enum power_supply_property sbs_ac_props[] = { 261 POWER_SUPPLY_PROP_ONLINE, 262 }; 263 264 static enum power_supply_property sbs_charge_battery_props[] = { 265 POWER_SUPPLY_PROP_STATUS, 266 POWER_SUPPLY_PROP_PRESENT, 267 POWER_SUPPLY_PROP_TECHNOLOGY, 268 POWER_SUPPLY_PROP_CYCLE_COUNT, 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_CAPACITY, 274 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 275 POWER_SUPPLY_PROP_CHARGE_FULL, 276 POWER_SUPPLY_PROP_CHARGE_NOW, 277 POWER_SUPPLY_PROP_TEMP, 278 POWER_SUPPLY_PROP_MODEL_NAME, 279 POWER_SUPPLY_PROP_MANUFACTURER, 280 }; 281 282 static enum power_supply_property sbs_energy_battery_props[] = { 283 POWER_SUPPLY_PROP_STATUS, 284 POWER_SUPPLY_PROP_PRESENT, 285 POWER_SUPPLY_PROP_TECHNOLOGY, 286 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 287 POWER_SUPPLY_PROP_VOLTAGE_NOW, 288 POWER_SUPPLY_PROP_CURRENT_NOW, 289 POWER_SUPPLY_PROP_CURRENT_AVG, 290 POWER_SUPPLY_PROP_POWER_NOW, 291 POWER_SUPPLY_PROP_POWER_AVG, 292 POWER_SUPPLY_PROP_CAPACITY, 293 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 294 POWER_SUPPLY_PROP_ENERGY_FULL, 295 POWER_SUPPLY_PROP_ENERGY_NOW, 296 POWER_SUPPLY_PROP_TEMP, 297 POWER_SUPPLY_PROP_MODEL_NAME, 298 POWER_SUPPLY_PROP_MANUFACTURER, 299 }; 300 301 static const struct power_supply_desc acpi_sbs_charger_desc = { 302 .name = "sbs-charger", 303 .type = POWER_SUPPLY_TYPE_MAINS, 304 .properties = sbs_ac_props, 305 .num_properties = ARRAY_SIZE(sbs_ac_props), 306 .get_property = sbs_get_ac_property, 307 }; 308 309 /* -------------------------------------------------------------------------- 310 Smart Battery System Management 311 -------------------------------------------------------------------------- */ 312 313 struct acpi_battery_reader { 314 u8 command; /* command for battery */ 315 u8 mode; /* word or block? */ 316 size_t offset; /* offset inside struct acpi_sbs_battery */ 317 }; 318 319 static struct acpi_battery_reader info_readers[] = { 320 {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)}, 321 {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)}, 322 {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)}, 323 {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)}, 324 {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)}, 325 {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)}, 326 {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)}, 327 {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)}, 328 {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)}, 329 {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)}, 330 {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)}, 331 }; 332 333 static struct acpi_battery_reader state_readers[] = { 334 {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)}, 335 {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)}, 336 {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)}, 337 {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)}, 338 {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)}, 339 {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)}, 340 {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)}, 341 }; 342 343 static int acpi_manager_get_info(struct acpi_sbs *sbs) 344 { 345 int result = 0; 346 u16 battery_system_info; 347 348 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER, 349 0x04, (u8 *)&battery_system_info); 350 if (!result) 351 sbs->batteries_supported = battery_system_info & 0x000f; 352 return result; 353 } 354 355 static int acpi_battery_get_info(struct acpi_battery *battery) 356 { 357 int i, result = 0; 358 359 for (i = 0; i < ARRAY_SIZE(info_readers); ++i) { 360 result = acpi_smbus_read(battery->sbs->hc, 361 info_readers[i].mode, 362 ACPI_SBS_BATTERY, 363 info_readers[i].command, 364 (u8 *) battery + 365 info_readers[i].offset); 366 if (result) 367 break; 368 } 369 return result; 370 } 371 372 static int acpi_battery_get_state(struct acpi_battery *battery) 373 { 374 int i, result = 0; 375 376 if (battery->update_time && 377 time_before(jiffies, battery->update_time + 378 msecs_to_jiffies(cache_time))) 379 return 0; 380 for (i = 0; i < ARRAY_SIZE(state_readers); ++i) { 381 result = acpi_smbus_read(battery->sbs->hc, 382 state_readers[i].mode, 383 ACPI_SBS_BATTERY, 384 state_readers[i].command, 385 (u8 *)battery + 386 state_readers[i].offset); 387 if (result) 388 goto end; 389 } 390 end: 391 battery->update_time = jiffies; 392 return result; 393 } 394 395 static int acpi_battery_get_alarm(struct acpi_battery *battery) 396 { 397 return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, 398 ACPI_SBS_BATTERY, 0x01, 399 (u8 *)&battery->alarm_capacity); 400 } 401 402 static int acpi_battery_set_alarm(struct acpi_battery *battery) 403 { 404 struct acpi_sbs *sbs = battery->sbs; 405 u16 value, sel = 1 << (battery->id + 12); 406 407 int ret; 408 409 410 if (sbs->manager_present) { 411 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER, 412 0x01, (u8 *)&value); 413 if (ret) 414 goto end; 415 if ((value & 0xf000) != sel) { 416 value &= 0x0fff; 417 value |= sel; 418 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, 419 ACPI_SBS_MANAGER, 420 0x01, (u8 *)&value, 2); 421 if (ret) 422 goto end; 423 } 424 } 425 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY, 426 0x01, (u8 *)&battery->alarm_capacity, 2); 427 end: 428 return ret; 429 } 430 431 static int acpi_ac_get_present(struct acpi_sbs *sbs) 432 { 433 int result; 434 u16 status; 435 436 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER, 437 0x13, (u8 *) & status); 438 439 if (result) 440 return result; 441 442 /* 443 * The spec requires that bit 4 always be 1. If it's not set, assume 444 * that the implementation doesn't support an SBS charger. 445 * 446 * And on some MacBooks a status of 0xffff is always returned, no 447 * matter whether the charger is plugged in or not, which is also 448 * wrong, so ignore the SBS charger for those too. 449 */ 450 if (!((status >> 4) & 0x1) || status == 0xffff) 451 return -ENODEV; 452 453 sbs->charger_present = (status >> 15) & 0x1; 454 return 0; 455 } 456 457 static ssize_t acpi_battery_alarm_show(struct device *dev, 458 struct device_attribute *attr, 459 char *buf) 460 { 461 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 462 acpi_battery_get_alarm(battery); 463 return sprintf(buf, "%d\n", battery->alarm_capacity * 464 acpi_battery_scale(battery) * 1000); 465 } 466 467 static ssize_t acpi_battery_alarm_store(struct device *dev, 468 struct device_attribute *attr, 469 const char *buf, size_t count) 470 { 471 unsigned long x; 472 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 473 if (sscanf(buf, "%lu\n", &x) == 1) 474 battery->alarm_capacity = x / 475 (1000 * acpi_battery_scale(battery)); 476 if (battery->present) 477 acpi_battery_set_alarm(battery); 478 return count; 479 } 480 481 static const struct device_attribute alarm_attr = { 482 .attr = {.name = "alarm", .mode = 0644}, 483 .show = acpi_battery_alarm_show, 484 .store = acpi_battery_alarm_store, 485 }; 486 487 /* -------------------------------------------------------------------------- 488 Driver Interface 489 -------------------------------------------------------------------------- */ 490 static int acpi_battery_read(struct acpi_battery *battery) 491 { 492 int result = 0, saved_present = battery->present; 493 u16 state; 494 495 if (battery->sbs->manager_present) { 496 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, 497 ACPI_SBS_MANAGER, 0x01, (u8 *)&state); 498 if (!result) 499 battery->present = state & (1 << battery->id); 500 state &= 0x0fff; 501 state |= 1 << (battery->id + 12); 502 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD, 503 ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2); 504 } else if (battery->id == 0) 505 battery->present = 1; 506 507 if (result || !battery->present) 508 return result; 509 510 if (saved_present != battery->present) { 511 battery->update_time = 0; 512 result = acpi_battery_get_info(battery); 513 if (result) { 514 battery->present = 0; 515 return result; 516 } 517 } 518 result = acpi_battery_get_state(battery); 519 if (result) 520 battery->present = 0; 521 return result; 522 } 523 524 /* Smart Battery */ 525 static int acpi_battery_add(struct acpi_sbs *sbs, int id) 526 { 527 struct acpi_battery *battery = &sbs->battery[id]; 528 struct power_supply_config psy_cfg = { .drv_data = battery, }; 529 int result; 530 531 battery->id = id; 532 battery->sbs = sbs; 533 result = acpi_battery_read(battery); 534 if (result) 535 return result; 536 537 sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id); 538 battery->bat_desc.name = battery->name; 539 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 540 if (!acpi_battery_mode(battery)) { 541 battery->bat_desc.properties = sbs_charge_battery_props; 542 battery->bat_desc.num_properties = 543 ARRAY_SIZE(sbs_charge_battery_props); 544 } else { 545 battery->bat_desc.properties = sbs_energy_battery_props; 546 battery->bat_desc.num_properties = 547 ARRAY_SIZE(sbs_energy_battery_props); 548 } 549 battery->bat_desc.get_property = acpi_sbs_battery_get_property; 550 battery->bat = power_supply_register(&sbs->device->dev, 551 &battery->bat_desc, &psy_cfg); 552 if (IS_ERR(battery->bat)) { 553 result = PTR_ERR(battery->bat); 554 battery->bat = NULL; 555 goto end; 556 } 557 558 result = device_create_file(&battery->bat->dev, &alarm_attr); 559 if (result) 560 goto end; 561 battery->have_sysfs_alarm = 1; 562 end: 563 printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n", 564 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device), 565 battery->name, battery->present ? "present" : "absent"); 566 return result; 567 } 568 569 static void acpi_battery_remove(struct acpi_sbs *sbs, int id) 570 { 571 struct acpi_battery *battery = &sbs->battery[id]; 572 573 if (battery->bat) { 574 if (battery->have_sysfs_alarm) 575 device_remove_file(&battery->bat->dev, &alarm_attr); 576 power_supply_unregister(battery->bat); 577 } 578 } 579 580 static int acpi_charger_add(struct acpi_sbs *sbs) 581 { 582 int result; 583 struct power_supply_config psy_cfg = { .drv_data = sbs, }; 584 585 result = acpi_ac_get_present(sbs); 586 if (result) 587 goto end; 588 589 sbs->charger_exists = 1; 590 sbs->charger = power_supply_register(&sbs->device->dev, 591 &acpi_sbs_charger_desc, &psy_cfg); 592 if (IS_ERR(sbs->charger)) { 593 result = PTR_ERR(sbs->charger); 594 sbs->charger = NULL; 595 } 596 printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n", 597 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device), 598 ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line"); 599 end: 600 return result; 601 } 602 603 static void acpi_charger_remove(struct acpi_sbs *sbs) 604 { 605 if (sbs->charger) 606 power_supply_unregister(sbs->charger); 607 } 608 609 static void acpi_sbs_callback(void *context) 610 { 611 int id; 612 struct acpi_sbs *sbs = context; 613 struct acpi_battery *bat; 614 u8 saved_charger_state = sbs->charger_present; 615 u8 saved_battery_state; 616 617 if (sbs->charger_exists) { 618 acpi_ac_get_present(sbs); 619 if (sbs->charger_present != saved_charger_state) 620 kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE); 621 } 622 623 if (sbs->manager_present) { 624 for (id = 0; id < MAX_SBS_BAT; ++id) { 625 if (!(sbs->batteries_supported & (1 << id))) 626 continue; 627 bat = &sbs->battery[id]; 628 saved_battery_state = bat->present; 629 acpi_battery_read(bat); 630 if (saved_battery_state == bat->present) 631 continue; 632 kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE); 633 } 634 } 635 } 636 637 static int acpi_sbs_add(struct acpi_device *device) 638 { 639 struct acpi_sbs *sbs; 640 int result = 0; 641 int id; 642 643 sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL); 644 if (!sbs) { 645 result = -ENOMEM; 646 goto end; 647 } 648 649 mutex_init(&sbs->lock); 650 651 sbs->hc = acpi_driver_data(device->parent); 652 sbs->device = device; 653 strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME); 654 strcpy(acpi_device_class(device), ACPI_SBS_CLASS); 655 device->driver_data = sbs; 656 657 result = acpi_charger_add(sbs); 658 if (result && result != -ENODEV) 659 goto end; 660 661 result = 0; 662 663 if (!x86_apple_machine) { 664 result = acpi_manager_get_info(sbs); 665 if (!result) { 666 sbs->manager_present = 1; 667 for (id = 0; id < MAX_SBS_BAT; ++id) 668 if ((sbs->batteries_supported & (1 << id))) 669 acpi_battery_add(sbs, id); 670 } 671 } 672 673 if (!sbs->manager_present) 674 acpi_battery_add(sbs, 0); 675 676 acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs); 677 end: 678 if (result) 679 acpi_sbs_remove(device); 680 return result; 681 } 682 683 static int acpi_sbs_remove(struct acpi_device *device) 684 { 685 struct acpi_sbs *sbs; 686 int id; 687 688 if (!device) 689 return -EINVAL; 690 sbs = acpi_driver_data(device); 691 if (!sbs) 692 return -EINVAL; 693 mutex_lock(&sbs->lock); 694 acpi_smbus_unregister_callback(sbs->hc); 695 for (id = 0; id < MAX_SBS_BAT; ++id) 696 acpi_battery_remove(sbs, id); 697 acpi_charger_remove(sbs); 698 mutex_unlock(&sbs->lock); 699 mutex_destroy(&sbs->lock); 700 kfree(sbs); 701 return 0; 702 } 703 704 #ifdef CONFIG_PM_SLEEP 705 static int acpi_sbs_resume(struct device *dev) 706 { 707 struct acpi_sbs *sbs; 708 if (!dev) 709 return -EINVAL; 710 sbs = to_acpi_device(dev)->driver_data; 711 acpi_sbs_callback(sbs); 712 return 0; 713 } 714 #else 715 #define acpi_sbs_resume NULL 716 #endif 717 718 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume); 719 720 static struct acpi_driver acpi_sbs_driver = { 721 .name = "sbs", 722 .class = ACPI_SBS_CLASS, 723 .ids = sbs_device_ids, 724 .ops = { 725 .add = acpi_sbs_add, 726 .remove = acpi_sbs_remove, 727 }, 728 .drv.pm = &acpi_sbs_pm, 729 }; 730 731 static int __init acpi_sbs_init(void) 732 { 733 int result = 0; 734 735 if (acpi_disabled) 736 return -ENODEV; 737 738 result = acpi_bus_register_driver(&acpi_sbs_driver); 739 if (result < 0) 740 return -ENODEV; 741 742 return 0; 743 } 744 745 static void __exit acpi_sbs_exit(void) 746 { 747 acpi_bus_unregister_driver(&acpi_sbs_driver); 748 return; 749 } 750 751 module_init(acpi_sbs_init); 752 module_exit(acpi_sbs_exit); 753