olpc_battery.c revision 415ec69fb1861fc377c65cb30ddc76999891b8e1
1/* 2 * Battery driver for One Laptop Per Child board. 3 * 4 * Copyright © 2006-2010 David Woodhouse <dwmw2@infradead.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11#include <linux/kernel.h> 12#include <linux/module.h> 13#include <linux/types.h> 14#include <linux/err.h> 15#include <linux/device.h> 16#include <linux/platform_device.h> 17#include <linux/power_supply.h> 18#include <linux/jiffies.h> 19#include <linux/sched.h> 20#include <linux/olpc-ec.h> 21#include <asm/olpc.h> 22 23 24#define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */ 25#define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */ 26#define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */ 27#define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */ 28#define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */ 29#define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */ 30#define EC_BAT_SOC 0x16 /* uint8_t, percentage */ 31#define EC_BAT_SERIAL 0x17 /* uint8_t[6] */ 32#define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */ 33#define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */ 34 35#define BAT_STAT_PRESENT 0x01 36#define BAT_STAT_FULL 0x02 37#define BAT_STAT_LOW 0x04 38#define BAT_STAT_DESTROY 0x08 39#define BAT_STAT_AC 0x10 40#define BAT_STAT_CHARGING 0x20 41#define BAT_STAT_DISCHARGING 0x40 42#define BAT_STAT_TRICKLE 0x80 43 44#define BAT_ERR_INFOFAIL 0x02 45#define BAT_ERR_OVERVOLTAGE 0x04 46#define BAT_ERR_OVERTEMP 0x05 47#define BAT_ERR_GAUGESTOP 0x06 48#define BAT_ERR_OUT_OF_CONTROL 0x07 49#define BAT_ERR_ID_FAIL 0x09 50#define BAT_ERR_ACR_FAIL 0x10 51 52#define BAT_ADDR_MFR_TYPE 0x5F 53 54/********************************************************************* 55 * Power 56 *********************************************************************/ 57 58static int olpc_ac_get_prop(struct power_supply *psy, 59 enum power_supply_property psp, 60 union power_supply_propval *val) 61{ 62 int ret = 0; 63 uint8_t status; 64 65 switch (psp) { 66 case POWER_SUPPLY_PROP_ONLINE: 67 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); 68 if (ret) 69 return ret; 70 71 val->intval = !!(status & BAT_STAT_AC); 72 break; 73 default: 74 ret = -EINVAL; 75 break; 76 } 77 return ret; 78} 79 80static enum power_supply_property olpc_ac_props[] = { 81 POWER_SUPPLY_PROP_ONLINE, 82}; 83 84static struct power_supply olpc_ac = { 85 .name = "olpc-ac", 86 .type = POWER_SUPPLY_TYPE_MAINS, 87 .properties = olpc_ac_props, 88 .num_properties = ARRAY_SIZE(olpc_ac_props), 89 .get_property = olpc_ac_get_prop, 90}; 91 92static char bat_serial[17]; /* Ick */ 93 94static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte) 95{ 96 if (olpc_platform_info.ecver > 0x44) { 97 if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE)) 98 val->intval = POWER_SUPPLY_STATUS_CHARGING; 99 else if (ec_byte & BAT_STAT_DISCHARGING) 100 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 101 else if (ec_byte & BAT_STAT_FULL) 102 val->intval = POWER_SUPPLY_STATUS_FULL; 103 else /* er,... */ 104 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 105 } else { 106 /* Older EC didn't report charge/discharge bits */ 107 if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */ 108 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 109 else if (ec_byte & BAT_STAT_FULL) 110 val->intval = POWER_SUPPLY_STATUS_FULL; 111 else /* Not _necessarily_ true but EC doesn't tell all yet */ 112 val->intval = POWER_SUPPLY_STATUS_CHARGING; 113 } 114 115 return 0; 116} 117 118static int olpc_bat_get_health(union power_supply_propval *val) 119{ 120 uint8_t ec_byte; 121 int ret; 122 123 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); 124 if (ret) 125 return ret; 126 127 switch (ec_byte) { 128 case 0: 129 val->intval = POWER_SUPPLY_HEALTH_GOOD; 130 break; 131 132 case BAT_ERR_OVERTEMP: 133 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 134 break; 135 136 case BAT_ERR_OVERVOLTAGE: 137 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 138 break; 139 140 case BAT_ERR_INFOFAIL: 141 case BAT_ERR_OUT_OF_CONTROL: 142 case BAT_ERR_ID_FAIL: 143 case BAT_ERR_ACR_FAIL: 144 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 145 break; 146 147 default: 148 /* Eep. We don't know this failure code */ 149 ret = -EIO; 150 } 151 152 return ret; 153} 154 155static int olpc_bat_get_mfr(union power_supply_propval *val) 156{ 157 uint8_t ec_byte; 158 int ret; 159 160 ec_byte = BAT_ADDR_MFR_TYPE; 161 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 162 if (ret) 163 return ret; 164 165 switch (ec_byte >> 4) { 166 case 1: 167 val->strval = "Gold Peak"; 168 break; 169 case 2: 170 val->strval = "BYD"; 171 break; 172 default: 173 val->strval = "Unknown"; 174 break; 175 } 176 177 return ret; 178} 179 180static int olpc_bat_get_tech(union power_supply_propval *val) 181{ 182 uint8_t ec_byte; 183 int ret; 184 185 ec_byte = BAT_ADDR_MFR_TYPE; 186 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 187 if (ret) 188 return ret; 189 190 switch (ec_byte & 0xf) { 191 case 1: 192 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; 193 break; 194 case 2: 195 val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe; 196 break; 197 default: 198 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 199 break; 200 } 201 202 return ret; 203} 204 205static int olpc_bat_get_charge_full_design(union power_supply_propval *val) 206{ 207 uint8_t ec_byte; 208 union power_supply_propval tech; 209 int ret, mfr; 210 211 ret = olpc_bat_get_tech(&tech); 212 if (ret) 213 return ret; 214 215 ec_byte = BAT_ADDR_MFR_TYPE; 216 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 217 if (ret) 218 return ret; 219 220 mfr = ec_byte >> 4; 221 222 switch (tech.intval) { 223 case POWER_SUPPLY_TECHNOLOGY_NiMH: 224 switch (mfr) { 225 case 1: /* Gold Peak */ 226 val->intval = 3000000*.8; 227 break; 228 default: 229 return -EIO; 230 } 231 break; 232 233 case POWER_SUPPLY_TECHNOLOGY_LiFe: 234 switch (mfr) { 235 case 1: /* Gold Peak, fall through */ 236 case 2: /* BYD */ 237 val->intval = 2800000; 238 break; 239 default: 240 return -EIO; 241 } 242 break; 243 244 default: 245 return -EIO; 246 } 247 248 return ret; 249} 250 251static int olpc_bat_get_charge_now(union power_supply_propval *val) 252{ 253 uint8_t soc; 254 union power_supply_propval full; 255 int ret; 256 257 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1); 258 if (ret) 259 return ret; 260 261 ret = olpc_bat_get_charge_full_design(&full); 262 if (ret) 263 return ret; 264 265 val->intval = soc * (full.intval / 100); 266 return 0; 267} 268 269static int olpc_bat_get_voltage_max_design(union power_supply_propval *val) 270{ 271 uint8_t ec_byte; 272 union power_supply_propval tech; 273 int mfr; 274 int ret; 275 276 ret = olpc_bat_get_tech(&tech); 277 if (ret) 278 return ret; 279 280 ec_byte = BAT_ADDR_MFR_TYPE; 281 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 282 if (ret) 283 return ret; 284 285 mfr = ec_byte >> 4; 286 287 switch (tech.intval) { 288 case POWER_SUPPLY_TECHNOLOGY_NiMH: 289 switch (mfr) { 290 case 1: /* Gold Peak */ 291 val->intval = 6000000; 292 break; 293 default: 294 return -EIO; 295 } 296 break; 297 298 case POWER_SUPPLY_TECHNOLOGY_LiFe: 299 switch (mfr) { 300 case 1: /* Gold Peak */ 301 val->intval = 6400000; 302 break; 303 case 2: /* BYD */ 304 val->intval = 6500000; 305 break; 306 default: 307 return -EIO; 308 } 309 break; 310 311 default: 312 return -EIO; 313 } 314 315 return ret; 316} 317 318/********************************************************************* 319 * Battery properties 320 *********************************************************************/ 321static int olpc_bat_get_property(struct power_supply *psy, 322 enum power_supply_property psp, 323 union power_supply_propval *val) 324{ 325 int ret = 0; 326 __be16 ec_word; 327 uint8_t ec_byte; 328 __be64 ser_buf; 329 330 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1); 331 if (ret) 332 return ret; 333 334 /* Theoretically there's a race here -- the battery could be 335 removed immediately after we check whether it's present, and 336 then we query for some other property of the now-absent battery. 337 It doesn't matter though -- the EC will return the last-known 338 information, and it's as if we just ran that _little_ bit faster 339 and managed to read it out before the battery went away. */ 340 if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) && 341 psp != POWER_SUPPLY_PROP_PRESENT) 342 return -ENODEV; 343 344 switch (psp) { 345 case POWER_SUPPLY_PROP_STATUS: 346 ret = olpc_bat_get_status(val, ec_byte); 347 if (ret) 348 return ret; 349 break; 350 case POWER_SUPPLY_PROP_CHARGE_TYPE: 351 if (ec_byte & BAT_STAT_TRICKLE) 352 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; 353 else if (ec_byte & BAT_STAT_CHARGING) 354 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; 355 else 356 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; 357 break; 358 case POWER_SUPPLY_PROP_PRESENT: 359 val->intval = !!(ec_byte & (BAT_STAT_PRESENT | 360 BAT_STAT_TRICKLE)); 361 break; 362 363 case POWER_SUPPLY_PROP_HEALTH: 364 if (ec_byte & BAT_STAT_DESTROY) 365 val->intval = POWER_SUPPLY_HEALTH_DEAD; 366 else { 367 ret = olpc_bat_get_health(val); 368 if (ret) 369 return ret; 370 } 371 break; 372 373 case POWER_SUPPLY_PROP_MANUFACTURER: 374 ret = olpc_bat_get_mfr(val); 375 if (ret) 376 return ret; 377 break; 378 case POWER_SUPPLY_PROP_TECHNOLOGY: 379 ret = olpc_bat_get_tech(val); 380 if (ret) 381 return ret; 382 break; 383 case POWER_SUPPLY_PROP_VOLTAGE_AVG: 384 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 385 ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2); 386 if (ret) 387 return ret; 388 389 val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32; 390 break; 391 case POWER_SUPPLY_PROP_CURRENT_AVG: 392 case POWER_SUPPLY_PROP_CURRENT_NOW: 393 ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2); 394 if (ret) 395 return ret; 396 397 val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120; 398 break; 399 case POWER_SUPPLY_PROP_CAPACITY: 400 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1); 401 if (ret) 402 return ret; 403 val->intval = ec_byte; 404 break; 405 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 406 if (ec_byte & BAT_STAT_FULL) 407 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 408 else if (ec_byte & BAT_STAT_LOW) 409 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 410 else 411 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 412 break; 413 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 414 ret = olpc_bat_get_charge_full_design(val); 415 if (ret) 416 return ret; 417 break; 418 case POWER_SUPPLY_PROP_CHARGE_NOW: 419 ret = olpc_bat_get_charge_now(val); 420 if (ret) 421 return ret; 422 break; 423 case POWER_SUPPLY_PROP_TEMP: 424 ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2); 425 if (ret) 426 return ret; 427 428 val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256; 429 break; 430 case POWER_SUPPLY_PROP_TEMP_AMBIENT: 431 ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); 432 if (ret) 433 return ret; 434 435 val->intval = (int)be16_to_cpu(ec_word) * 100 / 256; 436 break; 437 case POWER_SUPPLY_PROP_CHARGE_COUNTER: 438 ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2); 439 if (ret) 440 return ret; 441 442 val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15; 443 break; 444 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 445 ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8); 446 if (ret) 447 return ret; 448 449 sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf)); 450 val->strval = bat_serial; 451 break; 452 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 453 ret = olpc_bat_get_voltage_max_design(val); 454 if (ret) 455 return ret; 456 break; 457 default: 458 ret = -EINVAL; 459 break; 460 } 461 462 return ret; 463} 464 465static enum power_supply_property olpc_xo1_bat_props[] = { 466 POWER_SUPPLY_PROP_STATUS, 467 POWER_SUPPLY_PROP_CHARGE_TYPE, 468 POWER_SUPPLY_PROP_PRESENT, 469 POWER_SUPPLY_PROP_HEALTH, 470 POWER_SUPPLY_PROP_TECHNOLOGY, 471 POWER_SUPPLY_PROP_VOLTAGE_AVG, 472 POWER_SUPPLY_PROP_VOLTAGE_NOW, 473 POWER_SUPPLY_PROP_CURRENT_AVG, 474 POWER_SUPPLY_PROP_CURRENT_NOW, 475 POWER_SUPPLY_PROP_CAPACITY, 476 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 477 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 478 POWER_SUPPLY_PROP_CHARGE_NOW, 479 POWER_SUPPLY_PROP_TEMP, 480 POWER_SUPPLY_PROP_TEMP_AMBIENT, 481 POWER_SUPPLY_PROP_MANUFACTURER, 482 POWER_SUPPLY_PROP_SERIAL_NUMBER, 483 POWER_SUPPLY_PROP_CHARGE_COUNTER, 484 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 485}; 486 487/* XO-1.5 does not have ambient temperature property */ 488static enum power_supply_property olpc_xo15_bat_props[] = { 489 POWER_SUPPLY_PROP_STATUS, 490 POWER_SUPPLY_PROP_CHARGE_TYPE, 491 POWER_SUPPLY_PROP_PRESENT, 492 POWER_SUPPLY_PROP_HEALTH, 493 POWER_SUPPLY_PROP_TECHNOLOGY, 494 POWER_SUPPLY_PROP_VOLTAGE_AVG, 495 POWER_SUPPLY_PROP_VOLTAGE_NOW, 496 POWER_SUPPLY_PROP_CURRENT_AVG, 497 POWER_SUPPLY_PROP_CURRENT_NOW, 498 POWER_SUPPLY_PROP_CAPACITY, 499 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 500 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 501 POWER_SUPPLY_PROP_CHARGE_NOW, 502 POWER_SUPPLY_PROP_TEMP, 503 POWER_SUPPLY_PROP_MANUFACTURER, 504 POWER_SUPPLY_PROP_SERIAL_NUMBER, 505 POWER_SUPPLY_PROP_CHARGE_COUNTER, 506 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 507}; 508 509/* EEPROM reading goes completely around the power_supply API, sadly */ 510 511#define EEPROM_START 0x20 512#define EEPROM_END 0x80 513#define EEPROM_SIZE (EEPROM_END - EEPROM_START) 514 515static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj, 516 struct bin_attribute *attr, char *buf, loff_t off, size_t count) 517{ 518 uint8_t ec_byte; 519 int ret; 520 int i; 521 522 if (off >= EEPROM_SIZE) 523 return 0; 524 if (off + count > EEPROM_SIZE) 525 count = EEPROM_SIZE - off; 526 527 for (i = 0; i < count; i++) { 528 ec_byte = EEPROM_START + off + i; 529 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1); 530 if (ret) { 531 pr_err("olpc-battery: " 532 "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n", 533 ec_byte, ret); 534 return -EIO; 535 } 536 } 537 538 return count; 539} 540 541static struct bin_attribute olpc_bat_eeprom = { 542 .attr = { 543 .name = "eeprom", 544 .mode = S_IRUGO, 545 }, 546 .size = 0, 547 .read = olpc_bat_eeprom_read, 548}; 549 550/* Allow userspace to see the specific error value pulled from the EC */ 551 552static ssize_t olpc_bat_error_read(struct device *dev, 553 struct device_attribute *attr, char *buf) 554{ 555 uint8_t ec_byte; 556 ssize_t ret; 557 558 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); 559 if (ret < 0) 560 return ret; 561 562 return sprintf(buf, "%d\n", ec_byte); 563} 564 565static struct device_attribute olpc_bat_error = { 566 .attr = { 567 .name = "error", 568 .mode = S_IRUGO, 569 }, 570 .show = olpc_bat_error_read, 571}; 572 573/********************************************************************* 574 * Initialisation 575 *********************************************************************/ 576 577static struct power_supply olpc_bat = { 578 .name = "olpc-battery", 579 .get_property = olpc_bat_get_property, 580 .use_for_apm = 1, 581}; 582 583static int olpc_battery_suspend(struct platform_device *pdev, 584 pm_message_t state) 585{ 586 if (device_may_wakeup(olpc_ac.dev)) 587 olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR); 588 else 589 olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR); 590 591 if (device_may_wakeup(olpc_bat.dev)) 592 olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC 593 | EC_SCI_SRC_BATERR); 594 else 595 olpc_ec_wakeup_clear(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC 596 | EC_SCI_SRC_BATERR); 597 598 return 0; 599} 600 601static int olpc_battery_probe(struct platform_device *pdev) 602{ 603 int ret; 604 uint8_t status; 605 606 /* 607 * We've seen a number of EC protocol changes; this driver requires 608 * the latest EC protocol, supported by 0x44 and above. 609 */ 610 if (olpc_platform_info.ecver < 0x44) { 611 printk(KERN_NOTICE "OLPC EC version 0x%02x too old for " 612 "battery driver.\n", olpc_platform_info.ecver); 613 return -ENXIO; 614 } 615 616 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); 617 if (ret) 618 return ret; 619 620 /* Ignore the status. It doesn't actually matter */ 621 622 ret = power_supply_register(&pdev->dev, &olpc_ac); 623 if (ret) 624 return ret; 625 626 if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */ 627 olpc_bat.properties = olpc_xo15_bat_props; 628 olpc_bat.num_properties = ARRAY_SIZE(olpc_xo15_bat_props); 629 } else { /* XO-1 */ 630 olpc_bat.properties = olpc_xo1_bat_props; 631 olpc_bat.num_properties = ARRAY_SIZE(olpc_xo1_bat_props); 632 } 633 634 ret = power_supply_register(&pdev->dev, &olpc_bat); 635 if (ret) 636 goto battery_failed; 637 638 ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom); 639 if (ret) 640 goto eeprom_failed; 641 642 ret = device_create_file(olpc_bat.dev, &olpc_bat_error); 643 if (ret) 644 goto error_failed; 645 646 if (olpc_ec_wakeup_available()) { 647 device_set_wakeup_capable(olpc_ac.dev, true); 648 device_set_wakeup_capable(olpc_bat.dev, true); 649 } 650 651 return 0; 652 653error_failed: 654 device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom); 655eeprom_failed: 656 power_supply_unregister(&olpc_bat); 657battery_failed: 658 power_supply_unregister(&olpc_ac); 659 return ret; 660} 661 662static int olpc_battery_remove(struct platform_device *pdev) 663{ 664 device_remove_file(olpc_bat.dev, &olpc_bat_error); 665 device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom); 666 power_supply_unregister(&olpc_bat); 667 power_supply_unregister(&olpc_ac); 668 return 0; 669} 670 671static const struct of_device_id olpc_battery_ids[] __devinitconst = { 672 { .compatible = "olpc,xo1-battery" }, 673 {} 674}; 675MODULE_DEVICE_TABLE(of, olpc_battery_ids); 676 677static struct platform_driver olpc_battery_driver = { 678 .driver = { 679 .name = "olpc-battery", 680 .owner = THIS_MODULE, 681 .of_match_table = olpc_battery_ids, 682 }, 683 .probe = olpc_battery_probe, 684 .remove = olpc_battery_remove, 685 .suspend = olpc_battery_suspend, 686}; 687 688module_platform_driver(olpc_battery_driver); 689 690MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); 691MODULE_LICENSE("GPL"); 692MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine"); 693