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/dmi.h> 35 36 #include "sbshc.h" 37 #include "battery.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 static bool sbs_manager_broken; 62 63 #define MAX_SBS_BAT 4 64 #define ACPI_SBS_BLOCK_MAX 32 65 66 static const struct acpi_device_id sbs_device_ids[] = { 67 {"ACPI0002", 0}, 68 {"", 0}, 69 }; 70 MODULE_DEVICE_TABLE(acpi, sbs_device_ids); 71 72 struct acpi_battery { 73 struct power_supply *bat; 74 struct power_supply_desc bat_desc; 75 struct acpi_sbs *sbs; 76 unsigned long update_time; 77 char name[8]; 78 char manufacturer_name[ACPI_SBS_BLOCK_MAX]; 79 char device_name[ACPI_SBS_BLOCK_MAX]; 80 char device_chemistry[ACPI_SBS_BLOCK_MAX]; 81 u16 alarm_capacity; 82 u16 full_charge_capacity; 83 u16 design_capacity; 84 u16 design_voltage; 85 u16 serial_number; 86 u16 cycle_count; 87 u16 temp_now; 88 u16 voltage_now; 89 s16 rate_now; 90 s16 rate_avg; 91 u16 capacity_now; 92 u16 state_of_charge; 93 u16 state; 94 u16 mode; 95 u16 spec; 96 u8 id; 97 u8 present:1; 98 u8 have_sysfs_alarm:1; 99 }; 100 101 #define to_acpi_battery(x) power_supply_get_drvdata(x) 102 103 struct acpi_sbs { 104 struct power_supply *charger; 105 struct acpi_device *device; 106 struct acpi_smb_hc *hc; 107 struct mutex lock; 108 struct acpi_battery battery[MAX_SBS_BAT]; 109 u8 batteries_supported:4; 110 u8 manager_present:1; 111 u8 charger_present:1; 112 u8 charger_exists:1; 113 }; 114 115 #define to_acpi_sbs(x) power_supply_get_drvdata(x) 116 117 static int acpi_sbs_remove(struct acpi_device *device); 118 static int acpi_battery_get_state(struct acpi_battery *battery); 119 120 static inline int battery_scale(int log) 121 { 122 int scale = 1; 123 while (log--) 124 scale *= 10; 125 return scale; 126 } 127 128 static inline int acpi_battery_vscale(struct acpi_battery *battery) 129 { 130 return battery_scale((battery->spec & 0x0f00) >> 8); 131 } 132 133 static inline int acpi_battery_ipscale(struct acpi_battery *battery) 134 { 135 return battery_scale((battery->spec & 0xf000) >> 12); 136 } 137 138 static inline int acpi_battery_mode(struct acpi_battery *battery) 139 { 140 return (battery->mode & 0x8000); 141 } 142 143 static inline int acpi_battery_scale(struct acpi_battery *battery) 144 { 145 return (acpi_battery_mode(battery) ? 10 : 1) * 146 acpi_battery_ipscale(battery); 147 } 148 149 static int sbs_get_ac_property(struct power_supply *psy, 150 enum power_supply_property psp, 151 union power_supply_propval *val) 152 { 153 struct acpi_sbs *sbs = to_acpi_sbs(psy); 154 switch (psp) { 155 case POWER_SUPPLY_PROP_ONLINE: 156 val->intval = sbs->charger_present; 157 break; 158 default: 159 return -EINVAL; 160 } 161 return 0; 162 } 163 164 static int acpi_battery_technology(struct acpi_battery *battery) 165 { 166 if (!strcasecmp("NiCd", battery->device_chemistry)) 167 return POWER_SUPPLY_TECHNOLOGY_NiCd; 168 if (!strcasecmp("NiMH", battery->device_chemistry)) 169 return POWER_SUPPLY_TECHNOLOGY_NiMH; 170 if (!strcasecmp("LION", battery->device_chemistry)) 171 return POWER_SUPPLY_TECHNOLOGY_LION; 172 if (!strcasecmp("LiP", battery->device_chemistry)) 173 return POWER_SUPPLY_TECHNOLOGY_LIPO; 174 return POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 175 } 176 177 static int acpi_sbs_battery_get_property(struct power_supply *psy, 178 enum power_supply_property psp, 179 union power_supply_propval *val) 180 { 181 struct acpi_battery *battery = to_acpi_battery(psy); 182 183 if ((!battery->present) && psp != POWER_SUPPLY_PROP_PRESENT) 184 return -ENODEV; 185 186 acpi_battery_get_state(battery); 187 switch (psp) { 188 case POWER_SUPPLY_PROP_STATUS: 189 if (battery->rate_now < 0) 190 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 191 else if (battery->rate_now > 0) 192 val->intval = POWER_SUPPLY_STATUS_CHARGING; 193 else 194 val->intval = POWER_SUPPLY_STATUS_FULL; 195 break; 196 case POWER_SUPPLY_PROP_PRESENT: 197 val->intval = battery->present; 198 break; 199 case POWER_SUPPLY_PROP_TECHNOLOGY: 200 val->intval = acpi_battery_technology(battery); 201 break; 202 case POWER_SUPPLY_PROP_CYCLE_COUNT: 203 val->intval = battery->cycle_count; 204 break; 205 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 206 val->intval = battery->design_voltage * 207 acpi_battery_vscale(battery) * 1000; 208 break; 209 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 210 val->intval = battery->voltage_now * 211 acpi_battery_vscale(battery) * 1000; 212 break; 213 case POWER_SUPPLY_PROP_CURRENT_NOW: 214 case POWER_SUPPLY_PROP_POWER_NOW: 215 val->intval = abs(battery->rate_now) * 216 acpi_battery_ipscale(battery) * 1000; 217 val->intval *= (acpi_battery_mode(battery)) ? 218 (battery->voltage_now * 219 acpi_battery_vscale(battery) / 1000) : 1; 220 break; 221 case POWER_SUPPLY_PROP_CURRENT_AVG: 222 case POWER_SUPPLY_PROP_POWER_AVG: 223 val->intval = abs(battery->rate_avg) * 224 acpi_battery_ipscale(battery) * 1000; 225 val->intval *= (acpi_battery_mode(battery)) ? 226 (battery->voltage_now * 227 acpi_battery_vscale(battery) / 1000) : 1; 228 break; 229 case POWER_SUPPLY_PROP_CAPACITY: 230 val->intval = battery->state_of_charge; 231 break; 232 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 233 case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN: 234 val->intval = battery->design_capacity * 235 acpi_battery_scale(battery) * 1000; 236 break; 237 case POWER_SUPPLY_PROP_CHARGE_FULL: 238 case POWER_SUPPLY_PROP_ENERGY_FULL: 239 val->intval = battery->full_charge_capacity * 240 acpi_battery_scale(battery) * 1000; 241 break; 242 case POWER_SUPPLY_PROP_CHARGE_NOW: 243 case POWER_SUPPLY_PROP_ENERGY_NOW: 244 val->intval = battery->capacity_now * 245 acpi_battery_scale(battery) * 1000; 246 break; 247 case POWER_SUPPLY_PROP_TEMP: 248 val->intval = battery->temp_now - 2730; // dK -> dC 249 break; 250 case POWER_SUPPLY_PROP_MODEL_NAME: 251 val->strval = battery->device_name; 252 break; 253 case POWER_SUPPLY_PROP_MANUFACTURER: 254 val->strval = battery->manufacturer_name; 255 break; 256 default: 257 return -EINVAL; 258 } 259 return 0; 260 } 261 262 static enum power_supply_property sbs_ac_props[] = { 263 POWER_SUPPLY_PROP_ONLINE, 264 }; 265 266 static enum power_supply_property sbs_charge_battery_props[] = { 267 POWER_SUPPLY_PROP_STATUS, 268 POWER_SUPPLY_PROP_PRESENT, 269 POWER_SUPPLY_PROP_TECHNOLOGY, 270 POWER_SUPPLY_PROP_CYCLE_COUNT, 271 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 272 POWER_SUPPLY_PROP_VOLTAGE_NOW, 273 POWER_SUPPLY_PROP_CURRENT_NOW, 274 POWER_SUPPLY_PROP_CURRENT_AVG, 275 POWER_SUPPLY_PROP_CAPACITY, 276 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 277 POWER_SUPPLY_PROP_CHARGE_FULL, 278 POWER_SUPPLY_PROP_CHARGE_NOW, 279 POWER_SUPPLY_PROP_TEMP, 280 POWER_SUPPLY_PROP_MODEL_NAME, 281 POWER_SUPPLY_PROP_MANUFACTURER, 282 }; 283 284 static enum power_supply_property sbs_energy_battery_props[] = { 285 POWER_SUPPLY_PROP_STATUS, 286 POWER_SUPPLY_PROP_PRESENT, 287 POWER_SUPPLY_PROP_TECHNOLOGY, 288 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 289 POWER_SUPPLY_PROP_VOLTAGE_NOW, 290 POWER_SUPPLY_PROP_CURRENT_NOW, 291 POWER_SUPPLY_PROP_CURRENT_AVG, 292 POWER_SUPPLY_PROP_POWER_NOW, 293 POWER_SUPPLY_PROP_POWER_AVG, 294 POWER_SUPPLY_PROP_CAPACITY, 295 POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN, 296 POWER_SUPPLY_PROP_ENERGY_FULL, 297 POWER_SUPPLY_PROP_ENERGY_NOW, 298 POWER_SUPPLY_PROP_TEMP, 299 POWER_SUPPLY_PROP_MODEL_NAME, 300 POWER_SUPPLY_PROP_MANUFACTURER, 301 }; 302 303 static const struct power_supply_desc acpi_sbs_charger_desc = { 304 .name = "sbs-charger", 305 .type = POWER_SUPPLY_TYPE_MAINS, 306 .properties = sbs_ac_props, 307 .num_properties = ARRAY_SIZE(sbs_ac_props), 308 .get_property = sbs_get_ac_property, 309 }; 310 311 /* -------------------------------------------------------------------------- 312 Smart Battery System Management 313 -------------------------------------------------------------------------- */ 314 315 struct acpi_battery_reader { 316 u8 command; /* command for battery */ 317 u8 mode; /* word or block? */ 318 size_t offset; /* offset inside struct acpi_sbs_battery */ 319 }; 320 321 static struct acpi_battery_reader info_readers[] = { 322 {0x01, SMBUS_READ_WORD, offsetof(struct acpi_battery, alarm_capacity)}, 323 {0x03, SMBUS_READ_WORD, offsetof(struct acpi_battery, mode)}, 324 {0x10, SMBUS_READ_WORD, offsetof(struct acpi_battery, full_charge_capacity)}, 325 {0x17, SMBUS_READ_WORD, offsetof(struct acpi_battery, cycle_count)}, 326 {0x18, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_capacity)}, 327 {0x19, SMBUS_READ_WORD, offsetof(struct acpi_battery, design_voltage)}, 328 {0x1a, SMBUS_READ_WORD, offsetof(struct acpi_battery, spec)}, 329 {0x1c, SMBUS_READ_WORD, offsetof(struct acpi_battery, serial_number)}, 330 {0x20, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, manufacturer_name)}, 331 {0x21, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_name)}, 332 {0x22, SMBUS_READ_BLOCK, offsetof(struct acpi_battery, device_chemistry)}, 333 }; 334 335 static struct acpi_battery_reader state_readers[] = { 336 {0x08, SMBUS_READ_WORD, offsetof(struct acpi_battery, temp_now)}, 337 {0x09, SMBUS_READ_WORD, offsetof(struct acpi_battery, voltage_now)}, 338 {0x0a, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_now)}, 339 {0x0b, SMBUS_READ_WORD, offsetof(struct acpi_battery, rate_avg)}, 340 {0x0f, SMBUS_READ_WORD, offsetof(struct acpi_battery, capacity_now)}, 341 {0x0e, SMBUS_READ_WORD, offsetof(struct acpi_battery, state_of_charge)}, 342 {0x16, SMBUS_READ_WORD, offsetof(struct acpi_battery, state)}, 343 }; 344 345 static int acpi_manager_get_info(struct acpi_sbs *sbs) 346 { 347 int result = 0; 348 u16 battery_system_info; 349 350 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER, 351 0x04, (u8 *)&battery_system_info); 352 if (!result) 353 sbs->batteries_supported = battery_system_info & 0x000f; 354 return result; 355 } 356 357 static int acpi_battery_get_info(struct acpi_battery *battery) 358 { 359 int i, result = 0; 360 361 for (i = 0; i < ARRAY_SIZE(info_readers); ++i) { 362 result = acpi_smbus_read(battery->sbs->hc, 363 info_readers[i].mode, 364 ACPI_SBS_BATTERY, 365 info_readers[i].command, 366 (u8 *) battery + 367 info_readers[i].offset); 368 if (result) 369 break; 370 } 371 return result; 372 } 373 374 static int acpi_battery_get_state(struct acpi_battery *battery) 375 { 376 int i, result = 0; 377 378 if (battery->update_time && 379 time_before(jiffies, battery->update_time + 380 msecs_to_jiffies(cache_time))) 381 return 0; 382 for (i = 0; i < ARRAY_SIZE(state_readers); ++i) { 383 result = acpi_smbus_read(battery->sbs->hc, 384 state_readers[i].mode, 385 ACPI_SBS_BATTERY, 386 state_readers[i].command, 387 (u8 *)battery + 388 state_readers[i].offset); 389 if (result) 390 goto end; 391 } 392 end: 393 battery->update_time = jiffies; 394 return result; 395 } 396 397 static int acpi_battery_get_alarm(struct acpi_battery *battery) 398 { 399 return acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, 400 ACPI_SBS_BATTERY, 0x01, 401 (u8 *)&battery->alarm_capacity); 402 } 403 404 static int acpi_battery_set_alarm(struct acpi_battery *battery) 405 { 406 struct acpi_sbs *sbs = battery->sbs; 407 u16 value, sel = 1 << (battery->id + 12); 408 409 int ret; 410 411 412 if (sbs->manager_present) { 413 ret = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_MANAGER, 414 0x01, (u8 *)&value); 415 if (ret) 416 goto end; 417 if ((value & 0xf000) != sel) { 418 value &= 0x0fff; 419 value |= sel; 420 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, 421 ACPI_SBS_MANAGER, 422 0x01, (u8 *)&value, 2); 423 if (ret) 424 goto end; 425 } 426 } 427 ret = acpi_smbus_write(sbs->hc, SMBUS_WRITE_WORD, ACPI_SBS_BATTERY, 428 0x01, (u8 *)&battery->alarm_capacity, 2); 429 end: 430 return ret; 431 } 432 433 static int acpi_ac_get_present(struct acpi_sbs *sbs) 434 { 435 int result; 436 u16 status; 437 438 result = acpi_smbus_read(sbs->hc, SMBUS_READ_WORD, ACPI_SBS_CHARGER, 439 0x13, (u8 *) & status); 440 441 if (result) 442 return result; 443 444 /* 445 * The spec requires that bit 4 always be 1. If it's not set, assume 446 * that the implementation doesn't support an SBS charger 447 */ 448 if (!((status >> 4) & 0x1)) 449 return -ENODEV; 450 451 sbs->charger_present = (status >> 15) & 0x1; 452 return 0; 453 } 454 455 static ssize_t acpi_battery_alarm_show(struct device *dev, 456 struct device_attribute *attr, 457 char *buf) 458 { 459 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 460 acpi_battery_get_alarm(battery); 461 return sprintf(buf, "%d\n", battery->alarm_capacity * 462 acpi_battery_scale(battery) * 1000); 463 } 464 465 static ssize_t acpi_battery_alarm_store(struct device *dev, 466 struct device_attribute *attr, 467 const char *buf, size_t count) 468 { 469 unsigned long x; 470 struct acpi_battery *battery = to_acpi_battery(dev_get_drvdata(dev)); 471 if (sscanf(buf, "%lu\n", &x) == 1) 472 battery->alarm_capacity = x / 473 (1000 * acpi_battery_scale(battery)); 474 if (battery->present) 475 acpi_battery_set_alarm(battery); 476 return count; 477 } 478 479 static struct device_attribute alarm_attr = { 480 .attr = {.name = "alarm", .mode = 0644}, 481 .show = acpi_battery_alarm_show, 482 .store = acpi_battery_alarm_store, 483 }; 484 485 /* -------------------------------------------------------------------------- 486 Driver Interface 487 -------------------------------------------------------------------------- */ 488 static int acpi_battery_read(struct acpi_battery *battery) 489 { 490 int result = 0, saved_present = battery->present; 491 u16 state; 492 493 if (battery->sbs->manager_present) { 494 result = acpi_smbus_read(battery->sbs->hc, SMBUS_READ_WORD, 495 ACPI_SBS_MANAGER, 0x01, (u8 *)&state); 496 if (!result) 497 battery->present = state & (1 << battery->id); 498 state &= 0x0fff; 499 state |= 1 << (battery->id + 12); 500 acpi_smbus_write(battery->sbs->hc, SMBUS_WRITE_WORD, 501 ACPI_SBS_MANAGER, 0x01, (u8 *)&state, 2); 502 } else if (battery->id == 0) 503 battery->present = 1; 504 505 if (result || !battery->present) 506 return result; 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 = { .drv_data = battery, }; 527 int result; 528 529 battery->id = id; 530 battery->sbs = sbs; 531 result = acpi_battery_read(battery); 532 if (result) 533 return result; 534 535 sprintf(battery->name, ACPI_BATTERY_DIR_NAME, id); 536 battery->bat_desc.name = battery->name; 537 battery->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; 538 if (!acpi_battery_mode(battery)) { 539 battery->bat_desc.properties = sbs_charge_battery_props; 540 battery->bat_desc.num_properties = 541 ARRAY_SIZE(sbs_charge_battery_props); 542 } else { 543 battery->bat_desc.properties = sbs_energy_battery_props; 544 battery->bat_desc.num_properties = 545 ARRAY_SIZE(sbs_energy_battery_props); 546 } 547 battery->bat_desc.get_property = acpi_sbs_battery_get_property; 548 battery->bat = power_supply_register(&sbs->device->dev, 549 &battery->bat_desc, &psy_cfg); 550 if (IS_ERR(battery->bat)) { 551 result = PTR_ERR(battery->bat); 552 battery->bat = NULL; 553 goto end; 554 } 555 556 result = device_create_file(&battery->bat->dev, &alarm_attr); 557 if (result) 558 goto end; 559 battery->have_sysfs_alarm = 1; 560 end: 561 printk(KERN_INFO PREFIX "%s [%s]: Battery Slot [%s] (battery %s)\n", 562 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device), 563 battery->name, battery->present ? "present" : "absent"); 564 return result; 565 } 566 567 static void acpi_battery_remove(struct acpi_sbs *sbs, int id) 568 { 569 struct acpi_battery *battery = &sbs->battery[id]; 570 571 if (battery->bat) { 572 if (battery->have_sysfs_alarm) 573 device_remove_file(&battery->bat->dev, &alarm_attr); 574 power_supply_unregister(battery->bat); 575 } 576 } 577 578 static int acpi_charger_add(struct acpi_sbs *sbs) 579 { 580 int result; 581 struct power_supply_config psy_cfg = { .drv_data = sbs, }; 582 583 result = acpi_ac_get_present(sbs); 584 if (result) 585 goto end; 586 587 sbs->charger_exists = 1; 588 sbs->charger = power_supply_register(&sbs->device->dev, 589 &acpi_sbs_charger_desc, &psy_cfg); 590 if (IS_ERR(sbs->charger)) { 591 result = PTR_ERR(sbs->charger); 592 sbs->charger = NULL; 593 } 594 printk(KERN_INFO PREFIX "%s [%s]: AC Adapter [%s] (%s)\n", 595 ACPI_SBS_DEVICE_NAME, acpi_device_bid(sbs->device), 596 ACPI_AC_DIR_NAME, sbs->charger_present ? "on-line" : "off-line"); 597 end: 598 return result; 599 } 600 601 static void acpi_charger_remove(struct acpi_sbs *sbs) 602 { 603 if (sbs->charger) 604 power_supply_unregister(sbs->charger); 605 } 606 607 static void acpi_sbs_callback(void *context) 608 { 609 int id; 610 struct acpi_sbs *sbs = context; 611 struct acpi_battery *bat; 612 u8 saved_charger_state = sbs->charger_present; 613 u8 saved_battery_state; 614 615 if (sbs->charger_exists) { 616 acpi_ac_get_present(sbs); 617 if (sbs->charger_present != saved_charger_state) 618 kobject_uevent(&sbs->charger->dev.kobj, KOBJ_CHANGE); 619 } 620 621 if (sbs->manager_present) { 622 for (id = 0; id < MAX_SBS_BAT; ++id) { 623 if (!(sbs->batteries_supported & (1 << id))) 624 continue; 625 bat = &sbs->battery[id]; 626 saved_battery_state = bat->present; 627 acpi_battery_read(bat); 628 if (saved_battery_state == bat->present) 629 continue; 630 kobject_uevent(&bat->bat->dev.kobj, KOBJ_CHANGE); 631 } 632 } 633 } 634 635 static int disable_sbs_manager(const struct dmi_system_id *d) 636 { 637 sbs_manager_broken = true; 638 return 0; 639 } 640 641 static struct dmi_system_id acpi_sbs_dmi_table[] = { 642 { 643 .callback = disable_sbs_manager, 644 .ident = "Apple", 645 .matches = { 646 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc.") 647 }, 648 }, 649 { }, 650 }; 651 652 static int acpi_sbs_add(struct acpi_device *device) 653 { 654 struct acpi_sbs *sbs; 655 int result = 0; 656 int id; 657 658 dmi_check_system(acpi_sbs_dmi_table); 659 660 sbs = kzalloc(sizeof(struct acpi_sbs), GFP_KERNEL); 661 if (!sbs) { 662 result = -ENOMEM; 663 goto end; 664 } 665 666 mutex_init(&sbs->lock); 667 668 sbs->hc = acpi_driver_data(device->parent); 669 sbs->device = device; 670 strcpy(acpi_device_name(device), ACPI_SBS_DEVICE_NAME); 671 strcpy(acpi_device_class(device), ACPI_SBS_CLASS); 672 device->driver_data = sbs; 673 674 result = acpi_charger_add(sbs); 675 if (result && result != -ENODEV) 676 goto end; 677 678 result = 0; 679 680 if (!sbs_manager_broken) { 681 result = acpi_manager_get_info(sbs); 682 if (!result) { 683 sbs->manager_present = 1; 684 for (id = 0; id < MAX_SBS_BAT; ++id) 685 if ((sbs->batteries_supported & (1 << id))) 686 acpi_battery_add(sbs, id); 687 } 688 } 689 690 if (!sbs->manager_present) 691 acpi_battery_add(sbs, 0); 692 693 acpi_smbus_register_callback(sbs->hc, acpi_sbs_callback, sbs); 694 end: 695 if (result) 696 acpi_sbs_remove(device); 697 return result; 698 } 699 700 static int acpi_sbs_remove(struct acpi_device *device) 701 { 702 struct acpi_sbs *sbs; 703 int id; 704 705 if (!device) 706 return -EINVAL; 707 sbs = acpi_driver_data(device); 708 if (!sbs) 709 return -EINVAL; 710 mutex_lock(&sbs->lock); 711 acpi_smbus_unregister_callback(sbs->hc); 712 for (id = 0; id < MAX_SBS_BAT; ++id) 713 acpi_battery_remove(sbs, id); 714 acpi_charger_remove(sbs); 715 mutex_unlock(&sbs->lock); 716 mutex_destroy(&sbs->lock); 717 kfree(sbs); 718 return 0; 719 } 720 721 #ifdef CONFIG_PM_SLEEP 722 static int acpi_sbs_resume(struct device *dev) 723 { 724 struct acpi_sbs *sbs; 725 if (!dev) 726 return -EINVAL; 727 sbs = to_acpi_device(dev)->driver_data; 728 acpi_sbs_callback(sbs); 729 return 0; 730 } 731 #else 732 #define acpi_sbs_resume NULL 733 #endif 734 735 static SIMPLE_DEV_PM_OPS(acpi_sbs_pm, NULL, acpi_sbs_resume); 736 737 static struct acpi_driver acpi_sbs_driver = { 738 .name = "sbs", 739 .class = ACPI_SBS_CLASS, 740 .ids = sbs_device_ids, 741 .ops = { 742 .add = acpi_sbs_add, 743 .remove = acpi_sbs_remove, 744 }, 745 .drv.pm = &acpi_sbs_pm, 746 }; 747 748 static int __init acpi_sbs_init(void) 749 { 750 int result = 0; 751 752 if (acpi_disabled) 753 return -ENODEV; 754 755 result = acpi_bus_register_driver(&acpi_sbs_driver); 756 if (result < 0) 757 return -ENODEV; 758 759 return 0; 760 } 761 762 static void __exit acpi_sbs_exit(void) 763 { 764 acpi_bus_unregister_driver(&acpi_sbs_driver); 765 return; 766 } 767 768 module_init(acpi_sbs_init); 769 module_exit(acpi_sbs_exit); 770