1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Battery driver for One Laptop Per Child board. 4 * 5 * Copyright © 2006-2010 David Woodhouse <dwmw2@infradead.org> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/types.h> 11 #include <linux/err.h> 12 #include <linux/device.h> 13 #include <linux/of.h> 14 #include <linux/platform_device.h> 15 #include <linux/power_supply.h> 16 #include <linux/jiffies.h> 17 #include <linux/sched.h> 18 #include <linux/olpc-ec.h> 19 20 21 #define EC_BAT_VOLTAGE 0x10 /* uint16_t, *9.76/32, mV */ 22 #define EC_BAT_CURRENT 0x11 /* int16_t, *15.625/120, mA */ 23 #define EC_BAT_ACR 0x12 /* int16_t, *6250/15, µAh */ 24 #define EC_BAT_TEMP 0x13 /* uint16_t, *100/256, °C */ 25 #define EC_AMB_TEMP 0x14 /* uint16_t, *100/256, °C */ 26 #define EC_BAT_STATUS 0x15 /* uint8_t, bitmask */ 27 #define EC_BAT_SOC 0x16 /* uint8_t, percentage */ 28 #define EC_BAT_SERIAL 0x17 /* uint8_t[6] */ 29 #define EC_BAT_EEPROM 0x18 /* uint8_t adr as input, uint8_t output */ 30 #define EC_BAT_ERRCODE 0x1f /* uint8_t, bitmask */ 31 32 #define BAT_STAT_PRESENT 0x01 33 #define BAT_STAT_FULL 0x02 34 #define BAT_STAT_LOW 0x04 35 #define BAT_STAT_DESTROY 0x08 36 #define BAT_STAT_AC 0x10 37 #define BAT_STAT_CHARGING 0x20 38 #define BAT_STAT_DISCHARGING 0x40 39 #define BAT_STAT_TRICKLE 0x80 40 41 #define BAT_ERR_INFOFAIL 0x02 42 #define BAT_ERR_OVERVOLTAGE 0x04 43 #define BAT_ERR_OVERTEMP 0x05 44 #define BAT_ERR_GAUGESTOP 0x06 45 #define BAT_ERR_OUT_OF_CONTROL 0x07 46 #define BAT_ERR_ID_FAIL 0x09 47 #define BAT_ERR_ACR_FAIL 0x10 48 49 #define BAT_ADDR_MFR_TYPE 0x5F 50 51 struct olpc_battery_data { 52 struct power_supply *olpc_ac; 53 struct power_supply *olpc_bat; 54 char bat_serial[17]; 55 bool new_proto; 56 bool little_endian; 57 }; 58 59 /********************************************************************* 60 * Power 61 *********************************************************************/ 62 63 static int olpc_ac_get_prop(struct power_supply *psy, 64 enum power_supply_property psp, 65 union power_supply_propval *val) 66 { 67 int ret = 0; 68 uint8_t status; 69 70 switch (psp) { 71 case POWER_SUPPLY_PROP_ONLINE: 72 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); 73 if (ret) 74 return ret; 75 76 val->intval = !!(status & BAT_STAT_AC); 77 break; 78 default: 79 ret = -EINVAL; 80 break; 81 } 82 return ret; 83 } 84 85 static enum power_supply_property olpc_ac_props[] = { 86 POWER_SUPPLY_PROP_ONLINE, 87 }; 88 89 static const struct power_supply_desc olpc_ac_desc = { 90 .name = "olpc_ac", 91 .type = POWER_SUPPLY_TYPE_MAINS, 92 .properties = olpc_ac_props, 93 .num_properties = ARRAY_SIZE(olpc_ac_props), 94 .get_property = olpc_ac_get_prop, 95 }; 96 97 static int olpc_bat_get_status(struct olpc_battery_data *data, 98 union power_supply_propval *val, uint8_t ec_byte) 99 { 100 if (data->new_proto) { 101 if (ec_byte & (BAT_STAT_CHARGING | BAT_STAT_TRICKLE)) 102 val->intval = POWER_SUPPLY_STATUS_CHARGING; 103 else if (ec_byte & BAT_STAT_DISCHARGING) 104 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 105 else if (ec_byte & BAT_STAT_FULL) 106 val->intval = POWER_SUPPLY_STATUS_FULL; 107 else /* er,... */ 108 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 109 } else { 110 /* Older EC didn't report charge/discharge bits */ 111 if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */ 112 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 113 else if (ec_byte & BAT_STAT_FULL) 114 val->intval = POWER_SUPPLY_STATUS_FULL; 115 else /* Not _necessarily_ true but EC doesn't tell all yet */ 116 val->intval = POWER_SUPPLY_STATUS_CHARGING; 117 } 118 119 return 0; 120 } 121 122 static int olpc_bat_get_health(union power_supply_propval *val) 123 { 124 uint8_t ec_byte; 125 int ret; 126 127 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); 128 if (ret) 129 return ret; 130 131 switch (ec_byte) { 132 case 0: 133 val->intval = POWER_SUPPLY_HEALTH_GOOD; 134 break; 135 136 case BAT_ERR_OVERTEMP: 137 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 138 break; 139 140 case BAT_ERR_OVERVOLTAGE: 141 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 142 break; 143 144 case BAT_ERR_INFOFAIL: 145 case BAT_ERR_OUT_OF_CONTROL: 146 case BAT_ERR_ID_FAIL: 147 case BAT_ERR_ACR_FAIL: 148 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 149 break; 150 151 default: 152 /* Eep. We don't know this failure code */ 153 ret = -EIO; 154 } 155 156 return ret; 157 } 158 159 static int olpc_bat_get_mfr(union power_supply_propval *val) 160 { 161 uint8_t ec_byte; 162 int ret; 163 164 ec_byte = BAT_ADDR_MFR_TYPE; 165 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 166 if (ret) 167 return ret; 168 169 switch (ec_byte >> 4) { 170 case 1: 171 val->strval = "Gold Peak"; 172 break; 173 case 2: 174 val->strval = "BYD"; 175 break; 176 default: 177 val->strval = "Unknown"; 178 break; 179 } 180 181 return ret; 182 } 183 184 static int olpc_bat_get_tech(union power_supply_propval *val) 185 { 186 uint8_t ec_byte; 187 int ret; 188 189 ec_byte = BAT_ADDR_MFR_TYPE; 190 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 191 if (ret) 192 return ret; 193 194 switch (ec_byte & 0xf) { 195 case 1: 196 val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH; 197 break; 198 case 2: 199 val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe; 200 break; 201 default: 202 val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN; 203 break; 204 } 205 206 return ret; 207 } 208 209 static int olpc_bat_get_charge_full_design(union power_supply_propval *val) 210 { 211 uint8_t ec_byte; 212 union power_supply_propval tech; 213 int ret, mfr; 214 215 ret = olpc_bat_get_tech(&tech); 216 if (ret) 217 return ret; 218 219 ec_byte = BAT_ADDR_MFR_TYPE; 220 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 221 if (ret) 222 return ret; 223 224 mfr = ec_byte >> 4; 225 226 switch (tech.intval) { 227 case POWER_SUPPLY_TECHNOLOGY_NiMH: 228 switch (mfr) { 229 case 1: /* Gold Peak */ 230 val->intval = 3000000*.8; 231 break; 232 default: 233 return -EIO; 234 } 235 break; 236 237 case POWER_SUPPLY_TECHNOLOGY_LiFe: 238 switch (mfr) { 239 case 1: /* Gold Peak, fall through */ 240 case 2: /* BYD */ 241 val->intval = 2800000; 242 break; 243 default: 244 return -EIO; 245 } 246 break; 247 248 default: 249 return -EIO; 250 } 251 252 return ret; 253 } 254 255 static int olpc_bat_get_charge_now(union power_supply_propval *val) 256 { 257 uint8_t soc; 258 union power_supply_propval full; 259 int ret; 260 261 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &soc, 1); 262 if (ret) 263 return ret; 264 265 ret = olpc_bat_get_charge_full_design(&full); 266 if (ret) 267 return ret; 268 269 val->intval = soc * (full.intval / 100); 270 return 0; 271 } 272 273 static int olpc_bat_get_voltage_max_design(union power_supply_propval *val) 274 { 275 uint8_t ec_byte; 276 union power_supply_propval tech; 277 int mfr; 278 int ret; 279 280 ret = olpc_bat_get_tech(&tech); 281 if (ret) 282 return ret; 283 284 ec_byte = BAT_ADDR_MFR_TYPE; 285 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1); 286 if (ret) 287 return ret; 288 289 mfr = ec_byte >> 4; 290 291 switch (tech.intval) { 292 case POWER_SUPPLY_TECHNOLOGY_NiMH: 293 switch (mfr) { 294 case 1: /* Gold Peak */ 295 val->intval = 6000000; 296 break; 297 default: 298 return -EIO; 299 } 300 break; 301 302 case POWER_SUPPLY_TECHNOLOGY_LiFe: 303 switch (mfr) { 304 case 1: /* Gold Peak */ 305 val->intval = 6400000; 306 break; 307 case 2: /* BYD */ 308 val->intval = 6500000; 309 break; 310 default: 311 return -EIO; 312 } 313 break; 314 315 default: 316 return -EIO; 317 } 318 319 return ret; 320 } 321 322 static u16 ecword_to_cpu(struct olpc_battery_data *data, u16 ec_word) 323 { 324 if (data->little_endian) 325 return le16_to_cpu((__force __le16)ec_word); 326 else 327 return be16_to_cpu((__force __be16)ec_word); 328 } 329 330 /********************************************************************* 331 * Battery properties 332 *********************************************************************/ 333 static int olpc_bat_get_property(struct power_supply *psy, 334 enum power_supply_property psp, 335 union power_supply_propval *val) 336 { 337 struct olpc_battery_data *data = power_supply_get_drvdata(psy); 338 int ret = 0; 339 u16 ec_word; 340 uint8_t ec_byte; 341 __be64 ser_buf; 342 343 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1); 344 if (ret) 345 return ret; 346 347 /* Theoretically there's a race here -- the battery could be 348 removed immediately after we check whether it's present, and 349 then we query for some other property of the now-absent battery. 350 It doesn't matter though -- the EC will return the last-known 351 information, and it's as if we just ran that _little_ bit faster 352 and managed to read it out before the battery went away. */ 353 if (!(ec_byte & (BAT_STAT_PRESENT | BAT_STAT_TRICKLE)) && 354 psp != POWER_SUPPLY_PROP_PRESENT) 355 return -ENODEV; 356 357 switch (psp) { 358 case POWER_SUPPLY_PROP_STATUS: 359 ret = olpc_bat_get_status(data, val, ec_byte); 360 if (ret) 361 return ret; 362 break; 363 case POWER_SUPPLY_PROP_CHARGE_TYPE: 364 if (ec_byte & BAT_STAT_TRICKLE) 365 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; 366 else if (ec_byte & BAT_STAT_CHARGING) 367 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; 368 else 369 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; 370 break; 371 case POWER_SUPPLY_PROP_PRESENT: 372 val->intval = !!(ec_byte & (BAT_STAT_PRESENT | 373 BAT_STAT_TRICKLE)); 374 break; 375 376 case POWER_SUPPLY_PROP_HEALTH: 377 if (ec_byte & BAT_STAT_DESTROY) 378 val->intval = POWER_SUPPLY_HEALTH_DEAD; 379 else { 380 ret = olpc_bat_get_health(val); 381 if (ret) 382 return ret; 383 } 384 break; 385 386 case POWER_SUPPLY_PROP_MANUFACTURER: 387 ret = olpc_bat_get_mfr(val); 388 if (ret) 389 return ret; 390 break; 391 case POWER_SUPPLY_PROP_TECHNOLOGY: 392 ret = olpc_bat_get_tech(val); 393 if (ret) 394 return ret; 395 break; 396 case POWER_SUPPLY_PROP_VOLTAGE_AVG: 397 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 398 ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2); 399 if (ret) 400 return ret; 401 402 val->intval = ecword_to_cpu(data, ec_word) * 9760L / 32; 403 break; 404 case POWER_SUPPLY_PROP_CURRENT_AVG: 405 case POWER_SUPPLY_PROP_CURRENT_NOW: 406 ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2); 407 if (ret) 408 return ret; 409 410 val->intval = ecword_to_cpu(data, ec_word) * 15625L / 120; 411 break; 412 case POWER_SUPPLY_PROP_CAPACITY: 413 ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1); 414 if (ret) 415 return ret; 416 val->intval = ec_byte; 417 break; 418 case POWER_SUPPLY_PROP_CAPACITY_LEVEL: 419 if (ec_byte & BAT_STAT_FULL) 420 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL; 421 else if (ec_byte & BAT_STAT_LOW) 422 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW; 423 else 424 val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL; 425 break; 426 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 427 ret = olpc_bat_get_charge_full_design(val); 428 if (ret) 429 return ret; 430 break; 431 case POWER_SUPPLY_PROP_CHARGE_NOW: 432 ret = olpc_bat_get_charge_now(val); 433 if (ret) 434 return ret; 435 break; 436 case POWER_SUPPLY_PROP_TEMP: 437 ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2); 438 if (ret) 439 return ret; 440 441 val->intval = ecword_to_cpu(data, ec_word) * 10 / 256; 442 break; 443 case POWER_SUPPLY_PROP_TEMP_AMBIENT: 444 ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2); 445 if (ret) 446 return ret; 447 448 val->intval = (int)ecword_to_cpu(data, ec_word) * 10 / 256; 449 break; 450 case POWER_SUPPLY_PROP_CHARGE_COUNTER: 451 ret = olpc_ec_cmd(EC_BAT_ACR, NULL, 0, (void *)&ec_word, 2); 452 if (ret) 453 return ret; 454 455 val->intval = ecword_to_cpu(data, ec_word) * 6250 / 15; 456 break; 457 case POWER_SUPPLY_PROP_SERIAL_NUMBER: 458 ret = olpc_ec_cmd(EC_BAT_SERIAL, NULL, 0, (void *)&ser_buf, 8); 459 if (ret) 460 return ret; 461 462 sprintf(data->bat_serial, "%016llx", (long long)be64_to_cpu(ser_buf)); 463 val->strval = data->bat_serial; 464 break; 465 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 466 ret = olpc_bat_get_voltage_max_design(val); 467 if (ret) 468 return ret; 469 break; 470 default: 471 ret = -EINVAL; 472 break; 473 } 474 475 return ret; 476 } 477 478 static enum power_supply_property olpc_xo1_bat_props[] = { 479 POWER_SUPPLY_PROP_STATUS, 480 POWER_SUPPLY_PROP_CHARGE_TYPE, 481 POWER_SUPPLY_PROP_PRESENT, 482 POWER_SUPPLY_PROP_HEALTH, 483 POWER_SUPPLY_PROP_TECHNOLOGY, 484 POWER_SUPPLY_PROP_VOLTAGE_AVG, 485 POWER_SUPPLY_PROP_VOLTAGE_NOW, 486 POWER_SUPPLY_PROP_CURRENT_AVG, 487 POWER_SUPPLY_PROP_CURRENT_NOW, 488 POWER_SUPPLY_PROP_CAPACITY, 489 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 490 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 491 POWER_SUPPLY_PROP_CHARGE_NOW, 492 POWER_SUPPLY_PROP_TEMP, 493 POWER_SUPPLY_PROP_TEMP_AMBIENT, 494 POWER_SUPPLY_PROP_MANUFACTURER, 495 POWER_SUPPLY_PROP_SERIAL_NUMBER, 496 POWER_SUPPLY_PROP_CHARGE_COUNTER, 497 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 498 }; 499 500 /* XO-1.5 does not have ambient temperature property */ 501 static enum power_supply_property olpc_xo15_bat_props[] = { 502 POWER_SUPPLY_PROP_STATUS, 503 POWER_SUPPLY_PROP_CHARGE_TYPE, 504 POWER_SUPPLY_PROP_PRESENT, 505 POWER_SUPPLY_PROP_HEALTH, 506 POWER_SUPPLY_PROP_TECHNOLOGY, 507 POWER_SUPPLY_PROP_VOLTAGE_AVG, 508 POWER_SUPPLY_PROP_VOLTAGE_NOW, 509 POWER_SUPPLY_PROP_CURRENT_AVG, 510 POWER_SUPPLY_PROP_CURRENT_NOW, 511 POWER_SUPPLY_PROP_CAPACITY, 512 POWER_SUPPLY_PROP_CAPACITY_LEVEL, 513 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 514 POWER_SUPPLY_PROP_CHARGE_NOW, 515 POWER_SUPPLY_PROP_TEMP, 516 POWER_SUPPLY_PROP_MANUFACTURER, 517 POWER_SUPPLY_PROP_SERIAL_NUMBER, 518 POWER_SUPPLY_PROP_CHARGE_COUNTER, 519 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 520 }; 521 522 /* EEPROM reading goes completely around the power_supply API, sadly */ 523 524 #define EEPROM_START 0x20 525 #define EEPROM_END 0x80 526 #define EEPROM_SIZE (EEPROM_END - EEPROM_START) 527 528 static ssize_t olpc_bat_eeprom_read(struct file *filp, struct kobject *kobj, 529 const struct bin_attribute *attr, char *buf, loff_t off, size_t count) 530 { 531 uint8_t ec_byte; 532 int ret; 533 int i; 534 535 for (i = 0; i < count; i++) { 536 ec_byte = EEPROM_START + off + i; 537 ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &buf[i], 1); 538 if (ret) { 539 pr_err("olpc-battery: " 540 "EC_BAT_EEPROM cmd @ 0x%x failed - %d!\n", 541 ec_byte, ret); 542 return -EIO; 543 } 544 } 545 546 return count; 547 } 548 549 static const struct bin_attribute olpc_bat_eeprom = { 550 .attr = { 551 .name = "eeprom", 552 .mode = S_IRUGO, 553 }, 554 .size = EEPROM_SIZE, 555 .read = olpc_bat_eeprom_read, 556 }; 557 558 /* Allow userspace to see the specific error value pulled from the EC */ 559 560 static ssize_t olpc_bat_error_read(struct device *dev, 561 struct device_attribute *attr, char *buf) 562 { 563 uint8_t ec_byte; 564 ssize_t ret; 565 566 ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1); 567 if (ret < 0) 568 return ret; 569 570 return sysfs_emit(buf, "%d\n", ec_byte); 571 } 572 573 static struct device_attribute olpc_bat_error = { 574 .attr = { 575 .name = "error", 576 .mode = S_IRUGO, 577 }, 578 .show = olpc_bat_error_read, 579 }; 580 581 static struct attribute *olpc_bat_sysfs_attrs[] = { 582 &olpc_bat_error.attr, 583 NULL 584 }; 585 586 static const struct bin_attribute *const olpc_bat_sysfs_bin_attrs[] = { 587 &olpc_bat_eeprom, 588 NULL 589 }; 590 591 static const struct attribute_group olpc_bat_sysfs_group = { 592 .attrs = olpc_bat_sysfs_attrs, 593 .bin_attrs = olpc_bat_sysfs_bin_attrs, 594 }; 595 596 static const struct attribute_group *olpc_bat_sysfs_groups[] = { 597 &olpc_bat_sysfs_group, 598 NULL 599 }; 600 601 /********************************************************************* 602 * Initialisation 603 *********************************************************************/ 604 605 static struct power_supply_desc olpc_bat_desc = { 606 .name = "olpc_battery", 607 .get_property = olpc_bat_get_property, 608 .use_for_apm = 1, 609 }; 610 611 static int olpc_battery_suspend(struct platform_device *pdev, 612 pm_message_t state) 613 { 614 struct olpc_battery_data *data = platform_get_drvdata(pdev); 615 616 if (device_may_wakeup(&data->olpc_ac->dev)) 617 olpc_ec_wakeup_set(EC_SCI_SRC_ACPWR); 618 else 619 olpc_ec_wakeup_clear(EC_SCI_SRC_ACPWR); 620 621 if (device_may_wakeup(&data->olpc_bat->dev)) 622 olpc_ec_wakeup_set(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC 623 | EC_SCI_SRC_BATERR); 624 else 625 olpc_ec_wakeup_clear(EC_SCI_SRC_BATTERY | EC_SCI_SRC_BATSOC 626 | EC_SCI_SRC_BATERR); 627 628 return 0; 629 } 630 631 static int olpc_battery_probe(struct platform_device *pdev) 632 { 633 struct power_supply_config bat_psy_cfg = {}; 634 struct power_supply_config ac_psy_cfg = {}; 635 struct olpc_battery_data *data; 636 struct device_node *np; 637 uint8_t status; 638 uint8_t ecver; 639 int ret; 640 641 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); 642 if (!data) 643 return -ENOMEM; 644 platform_set_drvdata(pdev, data); 645 646 /* See if the EC is already there and get the EC revision */ 647 ret = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, &ecver, 1); 648 if (ret) 649 return ret; 650 651 np = of_find_compatible_node(NULL, NULL, "olpc,xo1.75-ec"); 652 if (np) { 653 of_node_put(np); 654 /* XO 1.75 */ 655 data->new_proto = true; 656 data->little_endian = true; 657 } else if (ecver > 0x44) { 658 /* XO 1 or 1.5 with a new EC firmware. */ 659 data->new_proto = true; 660 } else if (ecver < 0x44) { 661 /* 662 * We've seen a number of EC protocol changes; this driver 663 * requires the latest EC protocol, supported by 0x44 and above. 664 */ 665 printk(KERN_NOTICE "OLPC EC version 0x%02x too old for " 666 "battery driver.\n", ecver); 667 return -ENXIO; 668 } 669 670 ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1); 671 if (ret) 672 return ret; 673 674 /* Ignore the status. It doesn't actually matter */ 675 676 ac_psy_cfg.fwnode = dev_fwnode(&pdev->dev); 677 ac_psy_cfg.drv_data = data; 678 679 data->olpc_ac = devm_power_supply_register(&pdev->dev, &olpc_ac_desc, 680 &ac_psy_cfg); 681 if (IS_ERR(data->olpc_ac)) 682 return PTR_ERR(data->olpc_ac); 683 684 if (of_device_is_compatible(pdev->dev.of_node, "olpc,xo1.5-battery")) { 685 /* XO-1.5 */ 686 olpc_bat_desc.properties = olpc_xo15_bat_props; 687 olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo15_bat_props); 688 } else { 689 /* XO-1 */ 690 olpc_bat_desc.properties = olpc_xo1_bat_props; 691 olpc_bat_desc.num_properties = ARRAY_SIZE(olpc_xo1_bat_props); 692 } 693 694 bat_psy_cfg.fwnode = dev_fwnode(&pdev->dev); 695 bat_psy_cfg.drv_data = data; 696 bat_psy_cfg.attr_grp = olpc_bat_sysfs_groups; 697 698 data->olpc_bat = devm_power_supply_register(&pdev->dev, &olpc_bat_desc, 699 &bat_psy_cfg); 700 if (IS_ERR(data->olpc_bat)) 701 return PTR_ERR(data->olpc_bat); 702 703 if (olpc_ec_wakeup_available()) { 704 device_set_wakeup_capable(&data->olpc_ac->dev, true); 705 device_set_wakeup_capable(&data->olpc_bat->dev, true); 706 } 707 708 return 0; 709 } 710 711 static const struct of_device_id olpc_battery_ids[] = { 712 { .compatible = "olpc,xo1-battery" }, 713 { .compatible = "olpc,xo1.5-battery" }, 714 {} 715 }; 716 MODULE_DEVICE_TABLE(of, olpc_battery_ids); 717 718 static struct platform_driver olpc_battery_driver = { 719 .driver = { 720 .name = "olpc-battery", 721 .of_match_table = olpc_battery_ids, 722 }, 723 .probe = olpc_battery_probe, 724 .suspend = olpc_battery_suspend, 725 }; 726 727 module_platform_driver(olpc_battery_driver); 728 729 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); 730 MODULE_LICENSE("GPL"); 731 MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine"); 732