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