olpc_battery.c revision ecc2edd56c49fa31a0a9ed15a7bf810ae79d3b85
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 <asm/olpc.h> 21 22 23#define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */ 24#define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */ 25#define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */ 26#define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */ 27#define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */ 28#define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */ 29#define EC_BAT_SOC 0x16 /* uint8_t, percentage */ 30#define EC_BAT_SERIAL 0x17 /* uint8_t[6] */ 31#define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */ 32#define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */ 33 34#define BAT_STAT_PRESENT 0x01 35#define BAT_STAT_FULL 0x02 36#define BAT_STAT_LOW 0x04 37#define BAT_STAT_DESTROY 0x08 38#define BAT_STAT_AC 0x10 39#define BAT_STAT_CHARGING 0x20 40#define BAT_STAT_DISCHARGING 0x40 41#define BAT_STAT_TRICKLE 0x80 42 43#define BAT_ERR_INFOFAIL 0x02 44#define BAT_ERR_OVERVOLTAGE 0x04 45#define BAT_ERR_OVERTEMP 0x05 46#define BAT_ERR_GAUGESTOP 0x06 47#define BAT_ERR_OUT_OF_CONTROL 0x07 48#define BAT_ERR_ID_FAIL 0x09 49#define BAT_ERR_ACR_FAIL 0x10 50 51#define BAT_ADDR_MFR_TYPE 0x5F 52 53/********************************************************************* 54 * Power 55 *********************************************************************/ 56 57static int olpc_ac_get_prop(struct power_supply *psy, 58 enum power_supply_property psp, 59 union power_supply_propval *val) 60{ 61 int ret = 0; 62 uint8_t status; 63 64 switch (psp) { 65 case POWER_SUPPLY_PROP_ONLINE: 66 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); 67 if (ret) 68 return ret; 69 70 val->intval = !!(status & BAT_STAT_AC); 71 break; 72 default: 73 ret = -EINVAL; 74 break; 75 } 76 return ret; 77} 78 79static enum power_supply_property olpc_ac_props[] = { 80 POWER_SUPPLY_PROP_ONLINE, 81}; 82 83static struct power_supply olpc_ac = { 84 .name = "olpc-ac", 85 .type = POWER_SUPPLY_TYPE_MAINS, 86 .properties = olpc_ac_props, 87 .num_properties = ARRAY_SIZE(olpc_ac_props), 88 .get_property = olpc_ac_get_prop, 89}; 90 91static char bat_serial[17]; /* Ick */ 92 93static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte) 94{ 95 if (olpc_platform_info.ecver > 0x44) { 96 if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE)) 97 val->intval = POWER_SUPPLY_STATUS_CHARGING; 98 else if (ec_byte & BAT_STAT_DISCHARGING) 99 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 100 else if (ec_byte & BAT_STAT_FULL) 101 val->intval = POWER_SUPPLY_STATUS_FULL; 102 else /* er,... */ 103 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 104 } else { 105 /* Older EC didn't report charge/discharge bits */ 106 if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */ 107 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 108 else if (ec_byte & BAT_STAT_FULL) 109 val->intval = POWER_SUPPLY_STATUS_FULL; 110 else /* Not _necessarily_ true but EC doesn't tell all yet */ 111 val->intval = POWER_SUPPLY_STATUS_CHARGING; 112 } 113 114 return 0; 115} 116 117static int olpc_bat_get_health(union power_supply_propval *val) 118{ 119 uint8_t ec_byte; 120 int ret; 121 122 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); 123 if (ret) 124 return ret; 125 126 switch (ec_byte) { 127 case 0: 128 val->intval = POWER_SUPPLY_HEALTH_GOOD; 129 break; 130 131 case BAT_ERR_OVERTEMP: 132 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 133 break; 134 135 case BAT_ERR_OVERVOLTAGE: 136 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 137 break; 138 139 case BAT_ERR_INFOFAIL: 140 case BAT_ERR_OUT_OF_CONTROL: 141 case BAT_ERR_ID_FAIL: 142 case BAT_ERR_ACR_FAIL: 143 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 144 break; 145 146 default: 147 /* Eep. We don't know this failure code */ 148 ret = -EIO; 149 } 150 151 return ret; 152} 153 154static int olpc_bat_get_mfr(union power_supply_propval *val) 155{ 156 uint8_t ec_byte; 157 int ret; 158 159 ec_byte = BAT_ADDR_MFR_TYPE; 160 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 161 if (ret) 162 return ret; 163 164 switch (ec_byte >> 4) { 165 case 1: 166 val->strval = "Gold Peak"; 167 break; 168 case 2: 169 val->strval = "BYD"; 170 break; 171 default: 172 val->strval = "Unknown"; 173 break; 174 } 175 176 return ret; 177} 178 179static int olpc_bat_get_tech(union power_supply_propval *val) 180{ 181 uint8_t ec_byte; 182 int ret; 183 184 ec_byte = BAT_ADDR_MFR_TYPE; 185 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 186 if (ret) 187 return ret; 188 189 switch (ec_byte & 0xf) { 190 case 1: 191 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; 192 break; 193 case 2: 194 val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe; 195 break; 196 default: 197 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 198 break; 199 } 200 201 return ret; 202} 203 204static int olpc_bat_get_charge_full_design(union power_supply_propval *val) 205{ 206 uint8_t ec_byte; 207 union power_supply_propval tech; 208 int ret, mfr; 209 210 ret = olpc_bat_get_tech(&tech); 211 if (ret) 212 return ret; 213 214 ec_byte = BAT_ADDR_MFR_TYPE; 215 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 216 if (ret) 217 return ret; 218 219 mfr = ec_byte >> 4; 220 221 switch (tech.intval) { 222 case POWER_SUPPLY_TECHNOLOGY_NiMH: 223 switch (mfr) { 224 case 1: /* Gold Peak */ 225 val->intval = 3000000*.8; 226 break; 227 default: 228 return -EIO; 229 } 230 break; 231 232 case POWER_SUPPLY_TECHNOLOGY_LiFe: 233 switch (mfr) { 234 case 1: /* Gold Peak, fall through */ 235 case 2: /* BYD */ 236 val->intval = 2800000; 237 break; 238 default: 239 return -EIO; 240 } 241 break; 242 243 default: 244 return -EIO; 245 } 246 247 return ret; 248} 249 250static int olpc_bat_get_charge_now(union power_supply_propval *val) 251{ 252 uint8_t soc; 253 union power_supply_propval full; 254 int ret; 255 256 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1); 257 if (ret) 258 return ret; 259 260 ret = olpc_bat_get_charge_full_design(&full); 261 if (ret) 262 return ret; 263 264 val->intval = soc * (full.intval / 100); 265 return 0; 266} 267 268static int olpc_bat_get_voltage_max_design(union power_supply_propval *val) 269{ 270 uint8_t ec_byte; 271 union power_supply_propval tech; 272 int mfr; 273 int ret; 274 275 ret = olpc_bat_get_tech(&tech); 276 if (ret) 277 return ret; 278 279 ec_byte = BAT_ADDR_MFR_TYPE; 280 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 281 if (ret) 282 return ret; 283 284 mfr = ec_byte >> 4; 285 286 switch (tech.intval) { 287 case POWER_SUPPLY_TECHNOLOGY_NiMH: 288 switch (mfr) { 289 case 1: /* Gold Peak */ 290 val->intval = 6000000; 291 break; 292 default: 293 return -EIO; 294 } 295 break; 296 297 case POWER_SUPPLY_TECHNOLOGY_LiFe: 298 switch (mfr) { 299 case 1: /* Gold Peak */ 300 val->intval = 6400000; 301 break; 302 case 2: /* BYD */ 303 val->intval = 6500000; 304 break; 305 default: 306 return -EIO; 307 } 308 break; 309 310 default: 311 return -EIO; 312 } 313 314 return ret; 315} 316 317/********************************************************************* 318 * Battery properties 319 *********************************************************************/ 320static int olpc_bat_get_property(struct power_supply *psy, 321 enum power_supply_property psp, 322 union power_supply_propval *val) 323{ 324 int ret = 0; 325 __be16 ec_word; 326 uint8_t ec_byte; 327 __be64 ser_buf; 328 329 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1); 330 if (ret) 331 return ret; 332 333 /* Theoretically there's a race here -- the battery could be 334 removed immediately after we check whether it's present, and 335 then we query for some other property of the now-absent battery. 336 It doesn't matter though -- the EC will return the last-known 337 information, and it's as if we just ran that _little_ bit faster 338 and managed to read it out before the battery went away. */ 339 if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) && 340 psp != POWER_SUPPLY_PROP_PRESENT) 341 return -ENODEV; 342 343 switch (psp) { 344 case POWER_SUPPLY_PROP_STATUS: 345 ret = olpc_bat_get_status(val, ec_byte); 346 if (ret) 347 return ret; 348 break; 349 case POWER_SUPPLY_PROP_CHARGE_TYPE: 350 if (ec_byte & BAT_STAT_TRICKLE) 351 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; 352 else if (ec_byte & BAT_STAT_CHARGING) 353 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; 354 else 355 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; 356 break; 357 case POWER_SUPPLY_PROP_PRESENT: 358 val->intval = !!(ec_byte & (BAT_STAT_PRESENT | 359 BAT_STAT_TRICKLE)); 360 break; 361 362 case POWER_SUPPLY_PROP_HEALTH: 363 if (ec_byte & BAT_STAT_DESTROY) 364 val->intval = POWER_SUPPLY_HEALTH_DEAD; 365 else { 366 ret = olpc_bat_get_health(val); 367 if (ret) 368 return ret; 369 } 370 break; 371 372 case POWER_SUPPLY_PROP_MANUFACTURER: 373 ret = olpc_bat_get_mfr(val); 374 if (ret) 375 return ret; 376 break; 377 case POWER_SUPPLY_PROP_TECHNOLOGY: 378 ret = olpc_bat_get_tech(val); 379 if (ret) 380 return ret; 381 break; 382 case POWER_SUPPLY_PROP_VOLTAGE_AVG: 383 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 384 ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2); 385 if (ret) 386 return ret; 387 388 val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32; 389 break; 390 case POWER_SUPPLY_PROP_CURRENT_AVG: 391 case POWER_SUPPLY_PROP_CURRENT_NOW: 392 ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2); 393 if (ret) 394 return ret; 395 396 val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120; 397 break; 398 case POWER_SUPPLY_PROP_CAPACITY: 399 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1); 400 if (ret) 401 return ret; 402 val->intval = ec_byte; 403 break; 404 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 405 if (ec_byte & BAT_STAT_FULL) 406 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 407 else if (ec_byte & BAT_STAT_LOW) 408 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 409 else 410 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 411 break; 412 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 413 ret = olpc_bat_get_charge_full_design(val); 414 if (ret) 415 return ret; 416 break; 417 case POWER_SUPPLY_PROP_CHARGE_NOW: 418 ret = olpc_bat_get_charge_now(val); 419 if (ret) 420 return ret; 421 break; 422 case POWER_SUPPLY_PROP_TEMP: 423 ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2); 424 if (ret) 425 return ret; 426 427 val->intval = (s16)be16_to_cpu(ec_word) * 100 / 256; 428 break; 429 case POWER_SUPPLY_PROP_TEMP_AMBIENT: 430 ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); 431 if (ret) 432 return ret; 433 434 val->intval = (int)be16_to_cpu(ec_word) * 100 / 256; 435 break; 436 case POWER_SUPPLY_PROP_CHARGE_COUNTER: 437 ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2); 438 if (ret) 439 return ret; 440 441 val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15; 442 break; 443 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 444 ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8); 445 if (ret) 446 return ret; 447 448 sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf)); 449 val->strval = bat_serial; 450 break; 451 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 452 ret = olpc_bat_get_voltage_max_design(val); 453 if (ret) 454 return ret; 455 break; 456 default: 457 ret = -EINVAL; 458 break; 459 } 460 461 return ret; 462} 463 464static enum power_supply_property olpc_xo1_bat_props[] = { 465 POWER_SUPPLY_PROP_STATUS, 466 POWER_SUPPLY_PROP_CHARGE_TYPE, 467 POWER_SUPPLY_PROP_PRESENT, 468 POWER_SUPPLY_PROP_HEALTH, 469 POWER_SUPPLY_PROP_TECHNOLOGY, 470 POWER_SUPPLY_PROP_VOLTAGE_AVG, 471 POWER_SUPPLY_PROP_VOLTAGE_NOW, 472 POWER_SUPPLY_PROP_CURRENT_AVG, 473 POWER_SUPPLY_PROP_CURRENT_NOW, 474 POWER_SUPPLY_PROP_CAPACITY, 475 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 476 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 477 POWER_SUPPLY_PROP_CHARGE_NOW, 478 POWER_SUPPLY_PROP_TEMP, 479 POWER_SUPPLY_PROP_TEMP_AMBIENT, 480 POWER_SUPPLY_PROP_MANUFACTURER, 481 POWER_SUPPLY_PROP_SERIAL_NUMBER, 482 POWER_SUPPLY_PROP_CHARGE_COUNTER, 483 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 484}; 485 486/* XO-1.5 does not have ambient temperature property */ 487static enum power_supply_property olpc_xo15_bat_props[] = { 488 POWER_SUPPLY_PROP_STATUS, 489 POWER_SUPPLY_PROP_CHARGE_TYPE, 490 POWER_SUPPLY_PROP_PRESENT, 491 POWER_SUPPLY_PROP_HEALTH, 492 POWER_SUPPLY_PROP_TECHNOLOGY, 493 POWER_SUPPLY_PROP_VOLTAGE_AVG, 494 POWER_SUPPLY_PROP_VOLTAGE_NOW, 495 POWER_SUPPLY_PROP_CURRENT_AVG, 496 POWER_SUPPLY_PROP_CURRENT_NOW, 497 POWER_SUPPLY_PROP_CAPACITY, 498 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 499 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 500 POWER_SUPPLY_PROP_CHARGE_NOW, 501 POWER_SUPPLY_PROP_TEMP, 502 POWER_SUPPLY_PROP_MANUFACTURER, 503 POWER_SUPPLY_PROP_SERIAL_NUMBER, 504 POWER_SUPPLY_PROP_CHARGE_COUNTER, 505 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 506}; 507 508/* EEPROM reading goes completely around the power_supply API, sadly */ 509 510#define EEPROM_START 0x20 511#define EEPROM_END 0x80 512#define EEPROM_SIZE (EEPROM_END - EEPROM_START) 513 514static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj, 515 struct bin_attribute *attr, char *buf, loff_t off, size_t count) 516{ 517 uint8_t ec_byte; 518 int ret; 519 int i; 520 521 if (off >= EEPROM_SIZE) 522 return 0; 523 if (off + count > EEPROM_SIZE) 524 count = EEPROM_SIZE - off; 525 526 for (i = 0; i < count; i++) { 527 ec_byte = EEPROM_START + off + i; 528 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1); 529 if (ret) { 530 pr_err("olpc-battery: " 531 "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n", 532 ec_byte, ret); 533 return -EIO; 534 } 535 } 536 537 return count; 538} 539 540static struct bin_attribute olpc_bat_eeprom = { 541 .attr = { 542 .name = "eeprom", 543 .mode = S_IRUGO, 544 }, 545 .size = 0, 546 .read = olpc_bat_eeprom_read, 547}; 548 549/* Allow userspace to see the specific error value pulled from the EC */ 550 551static ssize_t olpc_bat_error_read(struct device *dev, 552 struct device_attribute *attr, char *buf) 553{ 554 uint8_t ec_byte; 555 ssize_t ret; 556 557 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); 558 if (ret < 0) 559 return ret; 560 561 return sprintf(buf, "%d\n", ec_byte); 562} 563 564static struct device_attribute olpc_bat_error = { 565 .attr = { 566 .name = "error", 567 .mode = S_IRUGO, 568 }, 569 .show = olpc_bat_error_read, 570}; 571 572/********************************************************************* 573 * Initialisation 574 *********************************************************************/ 575 576static struct power_supply olpc_bat = { 577 .name = "olpc-battery", 578 .get_property = olpc_bat_get_property, 579 .use_for_apm = 1, 580}; 581 582static int olpc_battery_suspend(struct platform_device *pdev, 583 pm_message_t state) 584{ 585 if (device_may_wakeup(olpc_ac.dev)) 586 olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR); 587 else 588 olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR); 589 590 if (device_may_wakeup(olpc_bat.dev)) 591 olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC 592 | EC_SCI_SRC_BATERR); 593 else 594 olpc_ec_wakeup_clear(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC 595 | EC_SCI_SRC_BATERR); 596 597 return 0; 598} 599 600static int __devinit olpc_battery_probe(struct platform_device *pdev) 601{ 602 int ret; 603 uint8_t status; 604 605 /* 606 * We've seen a number of EC protocol changes; this driver requires 607 * the latest EC protocol, supported by 0x44 and above. 608 */ 609 if (olpc_platform_info.ecver < 0x44) { 610 printk(KERN_NOTICE "OLPC EC version 0x%02x too old for " 611 "battery driver.\n", olpc_platform_info.ecver); 612 return -ENXIO; 613 } 614 615 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); 616 if (ret) 617 return ret; 618 619 /* Ignore the status. It doesn't actually matter */ 620 621 ret = power_supply_register(&pdev->dev, &olpc_ac); 622 if (ret) 623 return ret; 624 625 if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */ 626 olpc_bat.properties = olpc_xo15_bat_props; 627 olpc_bat.num_properties = ARRAY_SIZE(olpc_xo15_bat_props); 628 } else { /* XO-1 */ 629 olpc_bat.properties = olpc_xo1_bat_props; 630 olpc_bat.num_properties = ARRAY_SIZE(olpc_xo1_bat_props); 631 } 632 633 ret = power_supply_register(&pdev->dev, &olpc_bat); 634 if (ret) 635 goto battery_failed; 636 637 ret = device_create_bin_file(olpc_bat.dev, &olpc_bat_eeprom); 638 if (ret) 639 goto eeprom_failed; 640 641 ret = device_create_file(olpc_bat.dev, &olpc_bat_error); 642 if (ret) 643 goto error_failed; 644 645 if (olpc_ec_wakeup_available()) { 646 device_set_wakeup_capable(olpc_ac.dev, true); 647 device_set_wakeup_capable(olpc_bat.dev, true); 648 } 649 650 return 0; 651 652error_failed: 653 device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom); 654eeprom_failed: 655 power_supply_unregister(&olpc_bat); 656battery_failed: 657 power_supply_unregister(&olpc_ac); 658 return ret; 659} 660 661static int __devexit olpc_battery_remove(struct platform_device *pdev) 662{ 663 device_remove_file(olpc_bat.dev, &olpc_bat_error); 664 device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom); 665 power_supply_unregister(&olpc_bat); 666 power_supply_unregister(&olpc_ac); 667 return 0; 668} 669 670static const struct of_device_id olpc_battery_ids[] __devinitconst = { 671 { .compatible = "olpc,xo1-battery" }, 672 {} 673}; 674MODULE_DEVICE_TABLE(of, olpc_battery_ids); 675 676static struct platform_driver olpc_battery_driver = { 677 .driver = { 678 .name = "olpc-battery", 679 .owner = THIS_MODULE, 680 .of_match_table = olpc_battery_ids, 681 }, 682 .probe = olpc_battery_probe, 683 .remove = __devexit_p(olpc_battery_remove), 684 .suspend = olpc_battery_suspend, 685}; 686 687module_platform_driver(olpc_battery_driver); 688 689MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); 690MODULE_LICENSE("GPL"); 691MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine"); 692