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 <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
  58 static 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
  80 static enum power_supply_property olpc_ac_props[] = {
  81         POWER_SUPPLY_PROP_ONLINE,
  82 };
  83
  84 static 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
  92 static char bat_serial[17]; /* Ick */
  93
  94 static 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
 118 static 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
 155 static 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
 180 static 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
 205 static 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
 251 static 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
 269 static 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  *********************************************************************/
 321 static 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
 465 static 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 */
 488 static 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
 515 static 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
 541 static 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
 552 static 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
 565 static 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
 577 static struct power_supply olpc_bat = {
 578         .name = "olpc-battery",
 579         .get_property = olpc_bat_get_property,
 580         .use_for_apm = 1,
 581 };
 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         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
 653 error_failed:
 654         device_remove_bin_file(olpc_bat.dev, &olpc_bat_eeprom);
 655 eeprom_failed:
 656         power_supply_unregister(&olpc_bat);
 657 battery_failed:
 658         power_supply_unregister(&olpc_ac);
 659         return ret;
 660 }
 661
 662 static 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
 671 static const struct of_device_id olpc_battery_ids[] __devinitconst = {
 672         { .compatible = "olpc,xo1-battery" },
 673         {}
 674 };
 675 MODULE_DEVICE_TABLE(of, olpc_battery_ids);
 676
 677 static 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
 688 module_platform_driver(olpc_battery_driver);
 689
 690 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 691 MODULE_LICENSE("GPL");
 692 MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");