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/mod_devicetable.h> 14 #include <linux/types.h> 15 #include <linux/err.h> 16 #include <linux/device.h> 17 #include <linux/platform_device.h> 18 #include <linux/power_supply.h> 19 #include <linux/jiffies.h> 20 #include <linux/sched.h> 21 #include <linux/olpc-ec.h> 22 #include <asm/olpc.h> 23 24 25 #define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */ 26 #define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */ 27 #define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */ 28 #define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */ 29 #define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */ 30 #define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */ 31 #define EC_BAT_SOC 0x16 /* uint8_t, percentage */ 32 #define EC_BAT_SERIAL 0x17 /* uint8_t[6] */ 33 #define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */ 34 #define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */ 35 36 #define BAT_STAT_PRESENT 0x01 37 #define BAT_STAT_FULL 0x02 38 #define BAT_STAT_LOW 0x04 39 #define BAT_STAT_DESTROY 0x08 40 #define BAT_STAT_AC 0x10 41 #define BAT_STAT_CHARGING 0x20 42 #define BAT_STAT_DISCHARGING 0x40 43 #define BAT_STAT_TRICKLE 0x80 44 45 #define BAT_ERR_INFOFAIL 0x02 46 #define BAT_ERR_OVERVOLTAGE 0x04 47 #define BAT_ERR_OVERTEMP 0x05 48 #define BAT_ERR_GAUGESTOP 0x06 49 #define BAT_ERR_OUT_OF_CONTROL 0x07 50 #define BAT_ERR_ID_FAIL 0x09 51 #define BAT_ERR_ACR_FAIL 0x10 52 53 #define BAT_ADDR_MFR_TYPE 0x5F 54 55 /********************************************************************* 56 * Power 57 *********************************************************************/ 58 59 static int olpc_ac_get_prop(struct power_supply *psy, 60 enum power_supply_property psp, 61 union power_supply_propval *val) 62 { 63 int ret = 0; 64 uint8_t status; 65 66 switch (psp) { 67 case POWER_SUPPLY_PROP_ONLINE: 68 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); 69 if (ret) 70 return ret; 71 72 val->intval = !!(status & BAT_STAT_AC); 73 break; 74 default: 75 ret = -EINVAL; 76 break; 77 } 78 return ret; 79 } 80 81 static enum power_supply_property olpc_ac_props[] = { 82 POWER_SUPPLY_PROP_ONLINE, 83 }; 84 85 static const struct power_supply_desc olpc_ac_desc = { 86 .name = "olpc-ac", 87 .type = POWER_SUPPLY_TYPE_MAINS, 88 .properties = olpc_ac_props, 89 .num_properties = ARRAY_SIZE(olpc_ac_props), 90 .get_property = olpc_ac_get_prop, 91 }; 92 93 static struct power_supply *olpc_ac; 94 95 static char bat_serial[17]; /* Ick */ 96 97 static int olpc_bat_get_status(union power_supply_propval *val, uint8_t ec_byte) 98 { 99 if (olpc_platform_info.ecver > 0x44) { 100 if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE)) 101 val->intval = POWER_SUPPLY_STATUS_CHARGING; 102 else if (ec_byte & BAT_STAT_DISCHARGING) 103 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 104 else if (ec_byte & BAT_STAT_FULL) 105 val->intval = POWER_SUPPLY_STATUS_FULL; 106 else /* er,... */ 107 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 108 } else { 109 /* Older EC didn't report charge/discharge bits */ 110 if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */ 111 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 112 else if (ec_byte & BAT_STAT_FULL) 113 val->intval = POWER_SUPPLY_STATUS_FULL; 114 else /* Not _necessarily_ true but EC doesn't tell all yet */ 115 val->intval = POWER_SUPPLY_STATUS_CHARGING; 116 } 117 118 return 0; 119 } 120 121 static int olpc_bat_get_health(union power_supply_propval *val) 122 { 123 uint8_t ec_byte; 124 int ret; 125 126 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); 127 if (ret) 128 return ret; 129 130 switch (ec_byte) { 131 case 0: 132 val->intval = POWER_SUPPLY_HEALTH_GOOD; 133 break; 134 135 case BAT_ERR_OVERTEMP: 136 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 137 break; 138 139 case BAT_ERR_OVERVOLTAGE: 140 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 141 break; 142 143 case BAT_ERR_INFOFAIL: 144 case BAT_ERR_OUT_OF_CONTROL: 145 case BAT_ERR_ID_FAIL: 146 case BAT_ERR_ACR_FAIL: 147 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 148 break; 149 150 default: 151 /* Eep. We don't know this failure code */ 152 ret = -EIO; 153 } 154 155 return ret; 156 } 157 158 static int olpc_bat_get_mfr(union power_supply_propval *val) 159 { 160 uint8_t ec_byte; 161 int ret; 162 163 ec_byte = BAT_ADDR_MFR_TYPE; 164 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 165 if (ret) 166 return ret; 167 168 switch (ec_byte >> 4) { 169 case 1: 170 val->strval = "Gold Peak"; 171 break; 172 case 2: 173 val->strval = "BYD"; 174 break; 175 default: 176 val->strval = "Unknown"; 177 break; 178 } 179 180 return ret; 181 } 182 183 static int olpc_bat_get_tech(union power_supply_propval *val) 184 { 185 uint8_t ec_byte; 186 int ret; 187 188 ec_byte = BAT_ADDR_MFR_TYPE; 189 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 190 if (ret) 191 return ret; 192 193 switch (ec_byte & 0xf) { 194 case 1: 195 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; 196 break; 197 case 2: 198 val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe; 199 break; 200 default: 201 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 202 break; 203 } 204 205 return ret; 206 } 207 208 static int olpc_bat_get_charge_full_design(union power_supply_propval *val) 209 { 210 uint8_t ec_byte; 211 union power_supply_propval tech; 212 int ret, mfr; 213 214 ret = olpc_bat_get_tech(&tech); 215 if (ret) 216 return ret; 217 218 ec_byte = BAT_ADDR_MFR_TYPE; 219 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 220 if (ret) 221 return ret; 222 223 mfr = ec_byte >> 4; 224 225 switch (tech.intval) { 226 case POWER_SUPPLY_TECHNOLOGY_NiMH: 227 switch (mfr) { 228 case 1: /* Gold Peak */ 229 val->intval = 3000000*.8; 230 break; 231 default: 232 return -EIO; 233 } 234 break; 235 236 case POWER_SUPPLY_TECHNOLOGY_LiFe: 237 switch (mfr) { 238 case 1: /* Gold Peak, fall through */ 239 case 2: /* BYD */ 240 val->intval = 2800000; 241 break; 242 default: 243 return -EIO; 244 } 245 break; 246 247 default: 248 return -EIO; 249 } 250 251 return ret; 252 } 253 254 static int olpc_bat_get_charge_now(union power_supply_propval *val) 255 { 256 uint8_t soc; 257 union power_supply_propval full; 258 int ret; 259 260 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1); 261 if (ret) 262 return ret; 263 264 ret = olpc_bat_get_charge_full_design(&full); 265 if (ret) 266 return ret; 267 268 val->intval = soc * (full.intval / 100); 269 return 0; 270 } 271 272 static int olpc_bat_get_voltage_max_design(union power_supply_propval *val) 273 { 274 uint8_t ec_byte; 275 union power_supply_propval tech; 276 int mfr; 277 int ret; 278 279 ret = olpc_bat_get_tech(&tech); 280 if (ret) 281 return ret; 282 283 ec_byte = BAT_ADDR_MFR_TYPE; 284 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 285 if (ret) 286 return ret; 287 288 mfr = ec_byte >> 4; 289 290 switch (tech.intval) { 291 case POWER_SUPPLY_TECHNOLOGY_NiMH: 292 switch (mfr) { 293 case 1: /* Gold Peak */ 294 val->intval = 6000000; 295 break; 296 default: 297 return -EIO; 298 } 299 break; 300 301 case POWER_SUPPLY_TECHNOLOGY_LiFe: 302 switch (mfr) { 303 case 1: /* Gold Peak */ 304 val->intval = 6400000; 305 break; 306 case 2: /* BYD */ 307 val->intval = 6500000; 308 break; 309 default: 310 return -EIO; 311 } 312 break; 313 314 default: 315 return -EIO; 316 } 317 318 return ret; 319 } 320 321 /********************************************************************* 322 * Battery properties 323 *********************************************************************/ 324 static int olpc_bat_get_property(struct power_supply *psy, 325 enum power_supply_property psp, 326 union power_supply_propval *val) 327 { 328 int ret = 0; 329 __be16 ec_word; 330 uint8_t ec_byte; 331 __be64 ser_buf; 332 333 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1); 334 if (ret) 335 return ret; 336 337 /* Theoretically there's a race here -- the battery could be 338 removed immediately after we check whether it's present, and 339 then we query for some other property of the now-absent battery. 340 It doesn't matter though -- the EC will return the last-known 341 information, and it's as if we just ran that _little_ bit faster 342 and managed to read it out before the battery went away. */ 343 if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) && 344 psp != POWER_SUPPLY_PROP_PRESENT) 345 return -ENODEV; 346 347 switch (psp) { 348 case POWER_SUPPLY_PROP_STATUS: 349 ret = olpc_bat_get_status(val, ec_byte); 350 if (ret) 351 return ret; 352 break; 353 case POWER_SUPPLY_PROP_CHARGE_TYPE: 354 if (ec_byte & BAT_STAT_TRICKLE) 355 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; 356 else if (ec_byte & BAT_STAT_CHARGING) 357 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; 358 else 359 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; 360 break; 361 case POWER_SUPPLY_PROP_PRESENT: 362 val->intval = !!(ec_byte & (BAT_STAT_PRESENT | 363 BAT_STAT_TRICKLE)); 364 break; 365 366 case POWER_SUPPLY_PROP_HEALTH: 367 if (ec_byte & BAT_STAT_DESTROY) 368 val->intval = POWER_SUPPLY_HEALTH_DEAD; 369 else { 370 ret = olpc_bat_get_health(val); 371 if (ret) 372 return ret; 373 } 374 break; 375 376 case POWER_SUPPLY_PROP_MANUFACTURER: 377 ret = olpc_bat_get_mfr(val); 378 if (ret) 379 return ret; 380 break; 381 case POWER_SUPPLY_PROP_TECHNOLOGY: 382 ret = olpc_bat_get_tech(val); 383 if (ret) 384 return ret; 385 break; 386 case POWER_SUPPLY_PROP_VOLTAGE_AVG: 387 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 388 ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2); 389 if (ret) 390 return ret; 391 392 val->intval = (s16)be16_to_cpu(ec_word) * 9760L / 32; 393 break; 394 case POWER_SUPPLY_PROP_CURRENT_AVG: 395 case POWER_SUPPLY_PROP_CURRENT_NOW: 396 ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2); 397 if (ret) 398 return ret; 399 400 val->intval = (s16)be16_to_cpu(ec_word) * 15625L / 120; 401 break; 402 case POWER_SUPPLY_PROP_CAPACITY: 403 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1); 404 if (ret) 405 return ret; 406 val->intval = ec_byte; 407 break; 408 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 409 if (ec_byte & BAT_STAT_FULL) 410 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 411 else if (ec_byte & BAT_STAT_LOW) 412 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 413 else 414 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 415 break; 416 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 417 ret = olpc_bat_get_charge_full_design(val); 418 if (ret) 419 return ret; 420 break; 421 case POWER_SUPPLY_PROP_CHARGE_NOW: 422 ret = olpc_bat_get_charge_now(val); 423 if (ret) 424 return ret; 425 break; 426 case POWER_SUPPLY_PROP_TEMP: 427 ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2); 428 if (ret) 429 return ret; 430 431 val->intval = (s16)be16_to_cpu(ec_word) * 10 / 256; 432 break; 433 case POWER_SUPPLY_PROP_TEMP_AMBIENT: 434 ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); 435 if (ret) 436 return ret; 437 438 val->intval = (int)be16_to_cpu(ec_word) * 10 / 256; 439 break; 440 case POWER_SUPPLY_PROP_CHARGE_COUNTER: 441 ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2); 442 if (ret) 443 return ret; 444 445 val->intval = (s16)be16_to_cpu(ec_word) * 6250 / 15; 446 break; 447 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 448 ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8); 449 if (ret) 450 return ret; 451 452 sprintf(bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf)); 453 val->strval = bat_serial; 454 break; 455 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 456 ret = olpc_bat_get_voltage_max_design(val); 457 if (ret) 458 return ret; 459 break; 460 default: 461 ret = -EINVAL; 462 break; 463 } 464 465 return ret; 466 } 467 468 static enum power_supply_property olpc_xo1_bat_props[] = { 469 POWER_SUPPLY_PROP_STATUS, 470 POWER_SUPPLY_PROP_CHARGE_TYPE, 471 POWER_SUPPLY_PROP_PRESENT, 472 POWER_SUPPLY_PROP_HEALTH, 473 POWER_SUPPLY_PROP_TECHNOLOGY, 474 POWER_SUPPLY_PROP_VOLTAGE_AVG, 475 POWER_SUPPLY_PROP_VOLTAGE_NOW, 476 POWER_SUPPLY_PROP_CURRENT_AVG, 477 POWER_SUPPLY_PROP_CURRENT_NOW, 478 POWER_SUPPLY_PROP_CAPACITY, 479 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 480 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 481 POWER_SUPPLY_PROP_CHARGE_NOW, 482 POWER_SUPPLY_PROP_TEMP, 483 POWER_SUPPLY_PROP_TEMP_AMBIENT, 484 POWER_SUPPLY_PROP_MANUFACTURER, 485 POWER_SUPPLY_PROP_SERIAL_NUMBER, 486 POWER_SUPPLY_PROP_CHARGE_COUNTER, 487 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 488 }; 489 490 /* XO-1.5 does not have ambient temperature property */ 491 static enum power_supply_property olpc_xo15_bat_props[] = { 492 POWER_SUPPLY_PROP_STATUS, 493 POWER_SUPPLY_PROP_CHARGE_TYPE, 494 POWER_SUPPLY_PROP_PRESENT, 495 POWER_SUPPLY_PROP_HEALTH, 496 POWER_SUPPLY_PROP_TECHNOLOGY, 497 POWER_SUPPLY_PROP_VOLTAGE_AVG, 498 POWER_SUPPLY_PROP_VOLTAGE_NOW, 499 POWER_SUPPLY_PROP_CURRENT_AVG, 500 POWER_SUPPLY_PROP_CURRENT_NOW, 501 POWER_SUPPLY_PROP_CAPACITY, 502 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 503 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 504 POWER_SUPPLY_PROP_CHARGE_NOW, 505 POWER_SUPPLY_PROP_TEMP, 506 POWER_SUPPLY_PROP_MANUFACTURER, 507 POWER_SUPPLY_PROP_SERIAL_NUMBER, 508 POWER_SUPPLY_PROP_CHARGE_COUNTER, 509 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 510 }; 511 512 /* EEPROM reading goes completely around the power_supply API, sadly */ 513 514 #define EEPROM_START 0x20 515 #define EEPROM_END 0x80 516 #define EEPROM_SIZE (EEPROM_END - EEPROM_START) 517 518 static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj, 519 struct bin_attribute *attr, char *buf, loff_t off, size_t count) 520 { 521 uint8_t ec_byte; 522 int ret; 523 int i; 524 525 for (i = 0; i < count; i++) { 526 ec_byte = EEPROM_START + off + i; 527 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1); 528 if (ret) { 529 pr_err("olpc-battery: " 530 "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n", 531 ec_byte, ret); 532 return -EIO; 533 } 534 } 535 536 return count; 537 } 538 539 static const struct bin_attribute olpc_bat_eeprom = { 540 .attr = { 541 .name = "eeprom", 542 .mode = S_IRUGO, 543 }, 544 .size = EEPROM_SIZE, 545 .read = olpc_bat_eeprom_read, 546 }; 547 548 /* Allow userspace to see the specific error value pulled from the EC */ 549 550 static ssize_t olpc_bat_error_read(struct device *dev, 551 struct device_attribute *attr, char *buf) 552 { 553 uint8_t ec_byte; 554 ssize_t ret; 555 556 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); 557 if (ret < 0) 558 return ret; 559 560 return sprintf(buf, "%d\n", ec_byte); 561 } 562 563 static const struct device_attribute olpc_bat_error = { 564 .attr = { 565 .name = "error", 566 .mode = S_IRUGO, 567 }, 568 .show = olpc_bat_error_read, 569 }; 570 571 /********************************************************************* 572 * Initialisation 573 *********************************************************************/ 574 575 static struct power_supply_desc olpc_bat_desc = { 576 .name = "olpc-battery", 577 .get_property = olpc_bat_get_property, 578 .use_for_apm = 1, 579 }; 580 581 static struct power_supply *olpc_bat; 582 583 static 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 } 600 601 static 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 olpc_ac = power_supply_register(&pdev->dev, &olpc_ac_desc, NULL); 623 if (IS_ERR(olpc_ac)) 624 return PTR_ERR(olpc_ac); 625 626 if (olpc_board_at_least(olpc_board_pre(0xd0))) { /* XO-1.5 */ 627 olpc_bat_desc.properties = olpc_xo15_bat_props; 628 olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo15_bat_props); 629 } else { /* XO-1 */ 630 olpc_bat_desc.properties = olpc_xo1_bat_props; 631 olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props); 632 } 633 634 olpc_bat = power_supply_register(&pdev->dev, &olpc_bat_desc, NULL); 635 if (IS_ERR(olpc_bat)) { 636 ret = PTR_ERR(olpc_bat); 637 goto battery_failed; 638 } 639 640 ret = device_create_bin_file(&olpc_bat->dev, &olpc_bat_eeprom); 641 if (ret) 642 goto eeprom_failed; 643 644 ret = device_create_file(&olpc_bat->dev, &olpc_bat_error); 645 if (ret) 646 goto error_failed; 647 648 if (olpc_ec_wakeup_available()) { 649 device_set_wakeup_capable(&olpc_ac->dev, true); 650 device_set_wakeup_capable(&olpc_bat->dev, true); 651 } 652 653 return 0; 654 655 error_failed: 656 device_remove_bin_file(&olpc_bat->dev, &olpc_bat_eeprom); 657 eeprom_failed: 658 power_supply_unregister(olpc_bat); 659 battery_failed: 660 power_supply_unregister(olpc_ac); 661 return ret; 662 } 663 664 static int olpc_battery_remove(struct platform_device *pdev) 665 { 666 device_remove_file(&olpc_bat->dev, &olpc_bat_error); 667 device_remove_bin_file(&olpc_bat->dev, &olpc_bat_eeprom); 668 power_supply_unregister(olpc_bat); 669 power_supply_unregister(olpc_ac); 670 return 0; 671 } 672 673 static const struct of_device_id olpc_battery_ids[] = { 674 { .compatible = "olpc,xo1-battery" }, 675 {} 676 }; 677 MODULE_DEVICE_TABLE(of, olpc_battery_ids); 678 679 static struct platform_driver olpc_battery_driver = { 680 .driver = { 681 .name = "olpc-battery", 682 .of_match_table = olpc_battery_ids, 683 }, 684 .probe = olpc_battery_probe, 685 .remove = olpc_battery_remove, 686 .suspend = olpc_battery_suspend, 687 }; 688 689 module_platform_driver(olpc_battery_driver); 690 691 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); 692 MODULE_LICENSE("GPL"); 693 MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine"); 694