drivers/power/supply/olpc_battery.c

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