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