drivers/power/olpc_battery.c

   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
  57 static 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
  79 static enum power_supply_property olpc_ac_props[] = {
  80         POWER_SUPPLY_PROP_ONLINE,
  81 };
  82
  83 static 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
  91 static char bat_serial[17]; /* Ick */
  92
  93 static 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
 117 static 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
 154 static 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
 179 static 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
 204 static 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
 250 static 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
 268 static 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  *********************************************************************/
 320 static 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
 464 static 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 */
 487 static 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
 514 static 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
 540 static 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
 551 static 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
 564 static 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
 576 static struct power_supply olpc_bat = {
 577         .name = "olpc-battery",
 578         .get_property = olpc_bat_get_property,
 579         .use_for_apm = 1,
 580 };
 581
 582 static 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
 600 static 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
 652 error_failed:
 653         device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
 654 eeprom_failed:
 655         power_supply_unregister(&olpc_bat);
 656 battery_failed:
 657         power_supply_unregister(&olpc_ac);
 658         return ret;
 659 }
 660
 661 static 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
 670 static const struct of_device_id olpc_battery_ids[] __devinitconst = {
 671         { .compatible = "olpc,xo1-battery" },
 672         {}
 673 };
 674 MODULE_DEVICE_TABLE(of, olpc_battery_ids);
 675
 676 static 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
 687 module_platform_driver(olpc_battery_driver);
 688
 689 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 690 MODULE_LICENSE("GPL");
 691 MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");