linux/drivers/power/supply/olpc_battery.c
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   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
  58static 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
  80static enum power_supply_property olpc_ac_props[] = {
  81        POWER_SUPPLY_PROP_ONLINE,
  82};
  83
  84static 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
  92static struct power_supply *olpc_ac;
  93
  94static char bat_serial[17]; /* Ick */
  95
  96static 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
 120static 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
 157static 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
 182static 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
 207static 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
 253static 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
 271static 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 *********************************************************************/
 323static 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
 467static 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 */
 490static 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
 517static 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
 538static 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
 549static 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
 562static 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
 574static 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
 580static struct power_supply *olpc_bat;
 581
 582static 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
 600static 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
 654error_failed:
 655        device_remove_bin_file(&olpc_bat->dev, &olpc_bat_eeprom);
 656eeprom_failed:
 657        power_supply_unregister(olpc_bat);
 658battery_failed:
 659        power_supply_unregister(olpc_ac);
 660        return ret;
 661}
 662
 663static 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
 672static const struct of_device_id olpc_battery_ids[] = {
 673        { .compatible = "olpc,xo1-battery" },
 674        {}
 675};
 676MODULE_DEVICE_TABLE(of, olpc_battery_ids);
 677
 678static 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
 688module_platform_driver(olpc_battery_driver);
 689
 690MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 691MODULE_LICENSE("GPL");
 692MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");
 693