linux/drivers/power/bq27x00_battery.c
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   1/*
   2 * BQ27x00 battery driver
   3 *
   4 * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
   5 * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
   6 * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
   7 * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
   8 *
   9 * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
  10 *
  11 * This package is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License version 2 as
  13 * published by the Free Software Foundation.
  14 *
  15 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  18 *
  19 */
  20
  21/*
  22 * Datasheets:
  23 * http://focus.ti.com/docs/prod/folders/print/bq27000.html
  24 * http://focus.ti.com/docs/prod/folders/print/bq27500.html
  25 * http://www.ti.com/product/bq27425-g1
  26 */
  27
  28#include <linux/module.h>
  29#include <linux/param.h>
  30#include <linux/jiffies.h>
  31#include <linux/workqueue.h>
  32#include <linux/delay.h>
  33#include <linux/platform_device.h>
  34#include <linux/power_supply.h>
  35#include <linux/idr.h>
  36#include <linux/i2c.h>
  37#include <linux/slab.h>
  38#include <asm/unaligned.h>
  39
  40#include <linux/power/bq27x00_battery.h>
  41
  42#define DRIVER_VERSION                  "1.2.0"
  43
  44#define BQ27x00_REG_TEMP                0x06
  45#define BQ27x00_REG_VOLT                0x08
  46#define BQ27x00_REG_AI                  0x14
  47#define BQ27x00_REG_FLAGS               0x0A
  48#define BQ27x00_REG_TTE                 0x16
  49#define BQ27x00_REG_TTF                 0x18
  50#define BQ27x00_REG_TTECP               0x26
  51#define BQ27x00_REG_NAC                 0x0C /* Nominal available capacity */
  52#define BQ27x00_REG_LMD                 0x12 /* Last measured discharge */
  53#define BQ27x00_REG_CYCT                0x2A /* Cycle count total */
  54#define BQ27x00_REG_AE                  0x22 /* Available energy */
  55#define BQ27x00_POWER_AVG               0x24
  56
  57#define BQ27000_REG_RSOC                0x0B /* Relative State-of-Charge */
  58#define BQ27000_REG_ILMD                0x76 /* Initial last measured discharge */
  59#define BQ27000_FLAG_EDVF               BIT(0) /* Final End-of-Discharge-Voltage flag */
  60#define BQ27000_FLAG_EDV1               BIT(1) /* First End-of-Discharge-Voltage flag */
  61#define BQ27000_FLAG_CI                 BIT(4) /* Capacity Inaccurate flag */
  62#define BQ27000_FLAG_FC                 BIT(5)
  63#define BQ27000_FLAG_CHGS               BIT(7) /* Charge state flag */
  64
  65#define BQ27500_REG_SOC                 0x2C
  66#define BQ27500_REG_DCAP                0x3C /* Design capacity */
  67#define BQ27500_FLAG_DSC                BIT(0)
  68#define BQ27500_FLAG_SOCF               BIT(1) /* State-of-Charge threshold final */
  69#define BQ27500_FLAG_SOC1               BIT(2) /* State-of-Charge threshold 1 */
  70#define BQ27500_FLAG_FC                 BIT(9)
  71#define BQ27500_FLAG_OTC                BIT(15)
  72
  73/* bq27425 register addresses are same as bq27x00 addresses minus 4 */
  74#define BQ27425_REG_OFFSET              0x04
  75#define BQ27425_REG_SOC                 0x18 /* Register address plus offset */
  76
  77#define BQ27000_RS                      20 /* Resistor sense */
  78#define BQ27x00_POWER_CONSTANT          (256 * 29200 / 1000)
  79
  80struct bq27x00_device_info;
  81struct bq27x00_access_methods {
  82        int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
  83};
  84
  85enum bq27x00_chip { BQ27000, BQ27500, BQ27425};
  86
  87struct bq27x00_reg_cache {
  88        int temperature;
  89        int time_to_empty;
  90        int time_to_empty_avg;
  91        int time_to_full;
  92        int charge_full;
  93        int cycle_count;
  94        int capacity;
  95        int energy;
  96        int flags;
  97        int power_avg;
  98        int health;
  99};
 100
 101struct bq27x00_device_info {
 102        struct device           *dev;
 103        int                     id;
 104        enum bq27x00_chip       chip;
 105
 106        struct bq27x00_reg_cache cache;
 107        int charge_design_full;
 108
 109        unsigned long last_update;
 110        struct delayed_work work;
 111
 112        struct power_supply     bat;
 113
 114        struct bq27x00_access_methods bus;
 115
 116        struct mutex lock;
 117};
 118
 119static enum power_supply_property bq27x00_battery_props[] = {
 120        POWER_SUPPLY_PROP_STATUS,
 121        POWER_SUPPLY_PROP_PRESENT,
 122        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 123        POWER_SUPPLY_PROP_CURRENT_NOW,
 124        POWER_SUPPLY_PROP_CAPACITY,
 125        POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 126        POWER_SUPPLY_PROP_TEMP,
 127        POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 128        POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 129        POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 130        POWER_SUPPLY_PROP_TECHNOLOGY,
 131        POWER_SUPPLY_PROP_CHARGE_FULL,
 132        POWER_SUPPLY_PROP_CHARGE_NOW,
 133        POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 134        POWER_SUPPLY_PROP_CYCLE_COUNT,
 135        POWER_SUPPLY_PROP_ENERGY_NOW,
 136        POWER_SUPPLY_PROP_POWER_AVG,
 137        POWER_SUPPLY_PROP_HEALTH,
 138};
 139
 140static enum power_supply_property bq27425_battery_props[] = {
 141        POWER_SUPPLY_PROP_STATUS,
 142        POWER_SUPPLY_PROP_PRESENT,
 143        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 144        POWER_SUPPLY_PROP_CURRENT_NOW,
 145        POWER_SUPPLY_PROP_CAPACITY,
 146        POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 147        POWER_SUPPLY_PROP_TEMP,
 148        POWER_SUPPLY_PROP_TECHNOLOGY,
 149        POWER_SUPPLY_PROP_CHARGE_FULL,
 150        POWER_SUPPLY_PROP_CHARGE_NOW,
 151        POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 152};
 153
 154static unsigned int poll_interval = 360;
 155module_param(poll_interval, uint, 0644);
 156MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
 157                                "0 disables polling");
 158
 159/*
 160 * Common code for BQ27x00 devices
 161 */
 162
 163static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
 164                bool single)
 165{
 166        if (di->chip == BQ27425)
 167                return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
 168        return di->bus.read(di, reg, single);
 169}
 170
 171/*
 172 * Higher versions of the chip like BQ27425 and BQ27500
 173 * differ from BQ27000 and BQ27200 in calculation of certain
 174 * parameters. Hence we need to check for the chip type.
 175 */
 176static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
 177{
 178        if (di->chip == BQ27425 || di->chip == BQ27500)
 179                return true;
 180        return false;
 181}
 182
 183/*
 184 * Return the battery Relative State-of-Charge
 185 * Or < 0 if something fails.
 186 */
 187static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
 188{
 189        int rsoc;
 190
 191        if (di->chip == BQ27500)
 192                rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
 193        else if (di->chip == BQ27425)
 194                rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
 195        else
 196                rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
 197
 198        if (rsoc < 0)
 199                dev_dbg(di->dev, "error reading relative State-of-Charge\n");
 200
 201        return rsoc;
 202}
 203
 204/*
 205 * Return a battery charge value in µAh
 206 * Or < 0 if something fails.
 207 */
 208static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
 209{
 210        int charge;
 211
 212        charge = bq27x00_read(di, reg, false);
 213        if (charge < 0) {
 214                dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 215                        reg, charge);
 216                return charge;
 217        }
 218
 219        if (bq27xxx_is_chip_version_higher(di))
 220                charge *= 1000;
 221        else
 222                charge = charge * 3570 / BQ27000_RS;
 223
 224        return charge;
 225}
 226
 227/*
 228 * Return the battery Nominal available capaciy in µAh
 229 * Or < 0 if something fails.
 230 */
 231static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
 232{
 233        int flags;
 234        bool is_bq27500 = di->chip == BQ27500;
 235        bool is_higher = bq27xxx_is_chip_version_higher(di);
 236
 237        flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
 238        if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
 239                return -ENODATA;
 240
 241        return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
 242}
 243
 244/*
 245 * Return the battery Last measured discharge in µAh
 246 * Or < 0 if something fails.
 247 */
 248static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
 249{
 250        return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
 251}
 252
 253/*
 254 * Return the battery Initial last measured discharge in µAh
 255 * Or < 0 if something fails.
 256 */
 257static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
 258{
 259        int ilmd;
 260
 261        if (bq27xxx_is_chip_version_higher(di))
 262                ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
 263        else
 264                ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
 265
 266        if (ilmd < 0) {
 267                dev_dbg(di->dev, "error reading initial last measured discharge\n");
 268                return ilmd;
 269        }
 270
 271        if (bq27xxx_is_chip_version_higher(di))
 272                ilmd *= 1000;
 273        else
 274                ilmd = ilmd * 256 * 3570 / BQ27000_RS;
 275
 276        return ilmd;
 277}
 278
 279/*
 280 * Return the battery Available energy in µWh
 281 * Or < 0 if something fails.
 282 */
 283static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
 284{
 285        int ae;
 286
 287        ae = bq27x00_read(di, BQ27x00_REG_AE, false);
 288        if (ae < 0) {
 289                dev_dbg(di->dev, "error reading available energy\n");
 290                return ae;
 291        }
 292
 293        if (di->chip == BQ27500)
 294                ae *= 1000;
 295        else
 296                ae = ae * 29200 / BQ27000_RS;
 297
 298        return ae;
 299}
 300
 301/*
 302 * Return the battery temperature in tenths of degree Kelvin
 303 * Or < 0 if something fails.
 304 */
 305static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
 306{
 307        int temp;
 308
 309        temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
 310        if (temp < 0) {
 311                dev_err(di->dev, "error reading temperature\n");
 312                return temp;
 313        }
 314
 315        if (!bq27xxx_is_chip_version_higher(di))
 316                temp = 5 * temp / 2;
 317
 318        return temp;
 319}
 320
 321/*
 322 * Return the battery Cycle count total
 323 * Or < 0 if something fails.
 324 */
 325static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
 326{
 327        int cyct;
 328
 329        cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
 330        if (cyct < 0)
 331                dev_err(di->dev, "error reading cycle count total\n");
 332
 333        return cyct;
 334}
 335
 336/*
 337 * Read a time register.
 338 * Return < 0 if something fails.
 339 */
 340static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
 341{
 342        int tval;
 343
 344        tval = bq27x00_read(di, reg, false);
 345        if (tval < 0) {
 346                dev_dbg(di->dev, "error reading time register %02x: %d\n",
 347                        reg, tval);
 348                return tval;
 349        }
 350
 351        if (tval == 65535)
 352                return -ENODATA;
 353
 354        return tval * 60;
 355}
 356
 357/*
 358 * Read a power avg register.
 359 * Return < 0 if something fails.
 360 */
 361static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
 362{
 363        int tval;
 364
 365        tval = bq27x00_read(di, reg, false);
 366        if (tval < 0) {
 367                dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
 368                        reg, tval);
 369                return tval;
 370        }
 371
 372        if (di->chip == BQ27500)
 373                return tval;
 374        else
 375                return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
 376}
 377
 378/*
 379 * Read flag register.
 380 * Return < 0 if something fails.
 381 */
 382static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
 383{
 384        int tval;
 385
 386        tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 387        if (tval < 0) {
 388                dev_err(di->dev, "error reading flag register:%d\n", tval);
 389                return tval;
 390        }
 391
 392        if ((di->chip == BQ27500)) {
 393                if (tval & BQ27500_FLAG_SOCF)
 394                        tval = POWER_SUPPLY_HEALTH_DEAD;
 395                else if (tval & BQ27500_FLAG_OTC)
 396                        tval = POWER_SUPPLY_HEALTH_OVERHEAT;
 397                else
 398                        tval = POWER_SUPPLY_HEALTH_GOOD;
 399                return tval;
 400        } else {
 401                if (tval & BQ27000_FLAG_EDV1)
 402                        tval = POWER_SUPPLY_HEALTH_DEAD;
 403                else
 404                        tval = POWER_SUPPLY_HEALTH_GOOD;
 405                return tval;
 406        }
 407
 408        return -1;
 409}
 410
 411static void bq27x00_update(struct bq27x00_device_info *di)
 412{
 413        struct bq27x00_reg_cache cache = {0, };
 414        bool is_bq27500 = di->chip == BQ27500;
 415        bool is_bq27425 = di->chip == BQ27425;
 416
 417        cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
 418        if (cache.flags >= 0) {
 419                if (!is_bq27500 && !is_bq27425
 420                                && (cache.flags & BQ27000_FLAG_CI)) {
 421                        dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
 422                        cache.capacity = -ENODATA;
 423                        cache.energy = -ENODATA;
 424                        cache.time_to_empty = -ENODATA;
 425                        cache.time_to_empty_avg = -ENODATA;
 426                        cache.time_to_full = -ENODATA;
 427                        cache.charge_full = -ENODATA;
 428                        cache.health = -ENODATA;
 429                } else {
 430                        cache.capacity = bq27x00_battery_read_rsoc(di);
 431                        if (!is_bq27425) {
 432                                cache.energy = bq27x00_battery_read_energy(di);
 433                                cache.time_to_empty =
 434                                        bq27x00_battery_read_time(di,
 435                                                        BQ27x00_REG_TTE);
 436                                cache.time_to_empty_avg =
 437                                        bq27x00_battery_read_time(di,
 438                                                        BQ27x00_REG_TTECP);
 439                                cache.time_to_full =
 440                                        bq27x00_battery_read_time(di,
 441                                                        BQ27x00_REG_TTF);
 442                        }
 443                        cache.charge_full = bq27x00_battery_read_lmd(di);
 444                        cache.health = bq27x00_battery_read_health(di);
 445                }
 446                cache.temperature = bq27x00_battery_read_temperature(di);
 447                if (!is_bq27425)
 448                        cache.cycle_count = bq27x00_battery_read_cyct(di);
 449                cache.power_avg =
 450                        bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
 451
 452                /* We only have to read charge design full once */
 453                if (di->charge_design_full <= 0)
 454                        di->charge_design_full = bq27x00_battery_read_ilmd(di);
 455        }
 456
 457        if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
 458                di->cache = cache;
 459                power_supply_changed(&di->bat);
 460        }
 461
 462        di->last_update = jiffies;
 463}
 464
 465static void bq27x00_battery_poll(struct work_struct *work)
 466{
 467        struct bq27x00_device_info *di =
 468                container_of(work, struct bq27x00_device_info, work.work);
 469
 470        bq27x00_update(di);
 471
 472        if (poll_interval > 0) {
 473                /* The timer does not have to be accurate. */
 474                set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
 475                schedule_delayed_work(&di->work, poll_interval * HZ);
 476        }
 477}
 478
 479/*
 480 * Return the battery average current in µA
 481 * Note that current can be negative signed as well
 482 * Or 0 if something fails.
 483 */
 484static int bq27x00_battery_current(struct bq27x00_device_info *di,
 485        union power_supply_propval *val)
 486{
 487        int curr;
 488        int flags;
 489
 490        curr = bq27x00_read(di, BQ27x00_REG_AI, false);
 491        if (curr < 0) {
 492                dev_err(di->dev, "error reading current\n");
 493                return curr;
 494        }
 495
 496        if (bq27xxx_is_chip_version_higher(di)) {
 497                /* bq27500 returns signed value */
 498                val->intval = (int)((s16)curr) * 1000;
 499        } else {
 500                flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 501                if (flags & BQ27000_FLAG_CHGS) {
 502                        dev_dbg(di->dev, "negative current!\n");
 503                        curr = -curr;
 504                }
 505
 506                val->intval = curr * 3570 / BQ27000_RS;
 507        }
 508
 509        return 0;
 510}
 511
 512static int bq27x00_battery_status(struct bq27x00_device_info *di,
 513        union power_supply_propval *val)
 514{
 515        int status;
 516
 517        if (bq27xxx_is_chip_version_higher(di)) {
 518                if (di->cache.flags & BQ27500_FLAG_FC)
 519                        status = POWER_SUPPLY_STATUS_FULL;
 520                else if (di->cache.flags & BQ27500_FLAG_DSC)
 521                        status = POWER_SUPPLY_STATUS_DISCHARGING;
 522                else
 523                        status = POWER_SUPPLY_STATUS_CHARGING;
 524        } else {
 525                if (di->cache.flags & BQ27000_FLAG_FC)
 526                        status = POWER_SUPPLY_STATUS_FULL;
 527                else if (di->cache.flags & BQ27000_FLAG_CHGS)
 528                        status = POWER_SUPPLY_STATUS_CHARGING;
 529                else if (power_supply_am_i_supplied(&di->bat))
 530                        status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 531                else
 532                        status = POWER_SUPPLY_STATUS_DISCHARGING;
 533        }
 534
 535        val->intval = status;
 536
 537        return 0;
 538}
 539
 540static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
 541        union power_supply_propval *val)
 542{
 543        int level;
 544
 545        if (bq27xxx_is_chip_version_higher(di)) {
 546                if (di->cache.flags & BQ27500_FLAG_FC)
 547                        level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 548                else if (di->cache.flags & BQ27500_FLAG_SOC1)
 549                        level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 550                else if (di->cache.flags & BQ27500_FLAG_SOCF)
 551                        level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 552                else
 553                        level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 554        } else {
 555                if (di->cache.flags & BQ27000_FLAG_FC)
 556                        level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 557                else if (di->cache.flags & BQ27000_FLAG_EDV1)
 558                        level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 559                else if (di->cache.flags & BQ27000_FLAG_EDVF)
 560                        level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 561                else
 562                        level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 563        }
 564
 565        val->intval = level;
 566
 567        return 0;
 568}
 569
 570/*
 571 * Return the battery Voltage in millivolts
 572 * Or < 0 if something fails.
 573 */
 574static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
 575        union power_supply_propval *val)
 576{
 577        int volt;
 578
 579        volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
 580        if (volt < 0) {
 581                dev_err(di->dev, "error reading voltage\n");
 582                return volt;
 583        }
 584
 585        val->intval = volt * 1000;
 586
 587        return 0;
 588}
 589
 590static int bq27x00_simple_value(int value,
 591        union power_supply_propval *val)
 592{
 593        if (value < 0)
 594                return value;
 595
 596        val->intval = value;
 597
 598        return 0;
 599}
 600
 601#define to_bq27x00_device_info(x) container_of((x), \
 602                                struct bq27x00_device_info, bat);
 603
 604static int bq27x00_battery_get_property(struct power_supply *psy,
 605                                        enum power_supply_property psp,
 606                                        union power_supply_propval *val)
 607{
 608        int ret = 0;
 609        struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 610
 611        mutex_lock(&di->lock);
 612        if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 613                cancel_delayed_work_sync(&di->work);
 614                bq27x00_battery_poll(&di->work.work);
 615        }
 616        mutex_unlock(&di->lock);
 617
 618        if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 619                return -ENODEV;
 620
 621        switch (psp) {
 622        case POWER_SUPPLY_PROP_STATUS:
 623                ret = bq27x00_battery_status(di, val);
 624                break;
 625        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 626                ret = bq27x00_battery_voltage(di, val);
 627                break;
 628        case POWER_SUPPLY_PROP_PRESENT:
 629                val->intval = di->cache.flags < 0 ? 0 : 1;
 630                break;
 631        case POWER_SUPPLY_PROP_CURRENT_NOW:
 632                ret = bq27x00_battery_current(di, val);
 633                break;
 634        case POWER_SUPPLY_PROP_CAPACITY:
 635                ret = bq27x00_simple_value(di->cache.capacity, val);
 636                break;
 637        case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 638                ret = bq27x00_battery_capacity_level(di, val);
 639                break;
 640        case POWER_SUPPLY_PROP_TEMP:
 641                ret = bq27x00_simple_value(di->cache.temperature, val);
 642                if (ret == 0)
 643                        val->intval -= 2731;
 644                break;
 645        case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 646                ret = bq27x00_simple_value(di->cache.time_to_empty, val);
 647                break;
 648        case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 649                ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
 650                break;
 651        case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 652                ret = bq27x00_simple_value(di->cache.time_to_full, val);
 653                break;
 654        case POWER_SUPPLY_PROP_TECHNOLOGY:
 655                val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 656                break;
 657        case POWER_SUPPLY_PROP_CHARGE_NOW:
 658                ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
 659                break;
 660        case POWER_SUPPLY_PROP_CHARGE_FULL:
 661                ret = bq27x00_simple_value(di->cache.charge_full, val);
 662                break;
 663        case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 664                ret = bq27x00_simple_value(di->charge_design_full, val);
 665                break;
 666        case POWER_SUPPLY_PROP_CYCLE_COUNT:
 667                ret = bq27x00_simple_value(di->cache.cycle_count, val);
 668                break;
 669        case POWER_SUPPLY_PROP_ENERGY_NOW:
 670                ret = bq27x00_simple_value(di->cache.energy, val);
 671                break;
 672        case POWER_SUPPLY_PROP_POWER_AVG:
 673                ret = bq27x00_simple_value(di->cache.power_avg, val);
 674                break;
 675        case POWER_SUPPLY_PROP_HEALTH:
 676                ret = bq27x00_simple_value(di->cache.health, val);
 677                break;
 678        default:
 679                return -EINVAL;
 680        }
 681
 682        return ret;
 683}
 684
 685static void bq27x00_external_power_changed(struct power_supply *psy)
 686{
 687        struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 688
 689        cancel_delayed_work_sync(&di->work);
 690        schedule_delayed_work(&di->work, 0);
 691}
 692
 693static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
 694{
 695        int ret;
 696
 697        di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 698        if (di->chip == BQ27425) {
 699                di->bat.properties = bq27425_battery_props;
 700                di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
 701        } else {
 702                di->bat.properties = bq27x00_battery_props;
 703                di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
 704        }
 705        di->bat.get_property = bq27x00_battery_get_property;
 706        di->bat.external_power_changed = bq27x00_external_power_changed;
 707
 708        INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
 709        mutex_init(&di->lock);
 710
 711        ret = power_supply_register(di->dev, &di->bat);
 712        if (ret) {
 713                dev_err(di->dev, "failed to register battery: %d\n", ret);
 714                return ret;
 715        }
 716
 717        dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 718
 719        bq27x00_update(di);
 720
 721        return 0;
 722}
 723
 724static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
 725{
 726        /*
 727         * power_supply_unregister call bq27x00_battery_get_property which
 728         * call bq27x00_battery_poll.
 729         * Make sure that bq27x00_battery_poll will not call
 730         * schedule_delayed_work again after unregister (which cause OOPS).
 731         */
 732        poll_interval = 0;
 733
 734        cancel_delayed_work_sync(&di->work);
 735
 736        power_supply_unregister(&di->bat);
 737
 738        mutex_destroy(&di->lock);
 739}
 740
 741
 742/* i2c specific code */
 743#ifdef CONFIG_BATTERY_BQ27X00_I2C
 744
 745/* If the system has several batteries we need a different name for each
 746 * of them...
 747 */
 748static DEFINE_IDR(battery_id);
 749static DEFINE_MUTEX(battery_mutex);
 750
 751static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
 752{
 753        struct i2c_client *client = to_i2c_client(di->dev);
 754        struct i2c_msg msg[2];
 755        unsigned char data[2];
 756        int ret;
 757
 758        if (!client->adapter)
 759                return -ENODEV;
 760
 761        msg[0].addr = client->addr;
 762        msg[0].flags = 0;
 763        msg[0].buf = &reg;
 764        msg[0].len = sizeof(reg);
 765        msg[1].addr = client->addr;
 766        msg[1].flags = I2C_M_RD;
 767        msg[1].buf = data;
 768        if (single)
 769                msg[1].len = 1;
 770        else
 771                msg[1].len = 2;
 772
 773        ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 774        if (ret < 0)
 775                return ret;
 776
 777        if (!single)
 778                ret = get_unaligned_le16(data);
 779        else
 780                ret = data[0];
 781
 782        return ret;
 783}
 784
 785static int bq27x00_battery_probe(struct i2c_client *client,
 786                                 const struct i2c_device_id *id)
 787{
 788        char *name;
 789        struct bq27x00_device_info *di;
 790        int num;
 791        int retval = 0;
 792
 793        /* Get new ID for the new battery device */
 794        mutex_lock(&battery_mutex);
 795        num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
 796        mutex_unlock(&battery_mutex);
 797        if (num < 0)
 798                return num;
 799
 800        name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
 801        if (!name) {
 802                dev_err(&client->dev, "failed to allocate device name\n");
 803                retval = -ENOMEM;
 804                goto batt_failed_1;
 805        }
 806
 807        di = kzalloc(sizeof(*di), GFP_KERNEL);
 808        if (!di) {
 809                dev_err(&client->dev, "failed to allocate device info data\n");
 810                retval = -ENOMEM;
 811                goto batt_failed_2;
 812        }
 813
 814        di->id = num;
 815        di->dev = &client->dev;
 816        di->chip = id->driver_data;
 817        di->bat.name = name;
 818        di->bus.read = &bq27x00_read_i2c;
 819
 820        retval = bq27x00_powersupply_init(di);
 821        if (retval)
 822                goto batt_failed_3;
 823
 824        i2c_set_clientdata(client, di);
 825
 826        return 0;
 827
 828batt_failed_3:
 829        kfree(di);
 830batt_failed_2:
 831        kfree(name);
 832batt_failed_1:
 833        mutex_lock(&battery_mutex);
 834        idr_remove(&battery_id, num);
 835        mutex_unlock(&battery_mutex);
 836
 837        return retval;
 838}
 839
 840static int bq27x00_battery_remove(struct i2c_client *client)
 841{
 842        struct bq27x00_device_info *di = i2c_get_clientdata(client);
 843
 844        bq27x00_powersupply_unregister(di);
 845
 846        kfree(di->bat.name);
 847
 848        mutex_lock(&battery_mutex);
 849        idr_remove(&battery_id, di->id);
 850        mutex_unlock(&battery_mutex);
 851
 852        kfree(di);
 853
 854        return 0;
 855}
 856
 857static const struct i2c_device_id bq27x00_id[] = {
 858        { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
 859        { "bq27500", BQ27500 },
 860        { "bq27425", BQ27425 },
 861        {},
 862};
 863MODULE_DEVICE_TABLE(i2c, bq27x00_id);
 864
 865static struct i2c_driver bq27x00_battery_driver = {
 866        .driver = {
 867                .name = "bq27x00-battery",
 868        },
 869        .probe = bq27x00_battery_probe,
 870        .remove = bq27x00_battery_remove,
 871        .id_table = bq27x00_id,
 872};
 873
 874static inline int bq27x00_battery_i2c_init(void)
 875{
 876        int ret = i2c_add_driver(&bq27x00_battery_driver);
 877        if (ret)
 878                printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
 879
 880        return ret;
 881}
 882
 883static inline void bq27x00_battery_i2c_exit(void)
 884{
 885        i2c_del_driver(&bq27x00_battery_driver);
 886}
 887
 888#else
 889
 890static inline int bq27x00_battery_i2c_init(void) { return 0; }
 891static inline void bq27x00_battery_i2c_exit(void) {};
 892
 893#endif
 894
 895/* platform specific code */
 896#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
 897
 898static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
 899                        bool single)
 900{
 901        struct device *dev = di->dev;
 902        struct bq27000_platform_data *pdata = dev->platform_data;
 903        unsigned int timeout = 3;
 904        int upper, lower;
 905        int temp;
 906
 907        if (!single) {
 908                /* Make sure the value has not changed in between reading the
 909                 * lower and the upper part */
 910                upper = pdata->read(dev, reg + 1);
 911                do {
 912                        temp = upper;
 913                        if (upper < 0)
 914                                return upper;
 915
 916                        lower = pdata->read(dev, reg);
 917                        if (lower < 0)
 918                                return lower;
 919
 920                        upper = pdata->read(dev, reg + 1);
 921                } while (temp != upper && --timeout);
 922
 923                if (timeout == 0)
 924                        return -EIO;
 925
 926                return (upper << 8) | lower;
 927        }
 928
 929        return pdata->read(dev, reg);
 930}
 931
 932static int bq27000_battery_probe(struct platform_device *pdev)
 933{
 934        struct bq27x00_device_info *di;
 935        struct bq27000_platform_data *pdata = pdev->dev.platform_data;
 936        int ret;
 937
 938        if (!pdata) {
 939                dev_err(&pdev->dev, "no platform_data supplied\n");
 940                return -EINVAL;
 941        }
 942
 943        if (!pdata->read) {
 944                dev_err(&pdev->dev, "no hdq read callback supplied\n");
 945                return -EINVAL;
 946        }
 947
 948        di = kzalloc(sizeof(*di), GFP_KERNEL);
 949        if (!di) {
 950                dev_err(&pdev->dev, "failed to allocate device info data\n");
 951                return -ENOMEM;
 952        }
 953
 954        platform_set_drvdata(pdev, di);
 955
 956        di->dev = &pdev->dev;
 957        di->chip = BQ27000;
 958
 959        di->bat.name = pdata->name ?: dev_name(&pdev->dev);
 960        di->bus.read = &bq27000_read_platform;
 961
 962        ret = bq27x00_powersupply_init(di);
 963        if (ret)
 964                goto err_free;
 965
 966        return 0;
 967
 968err_free:
 969        platform_set_drvdata(pdev, NULL);
 970        kfree(di);
 971
 972        return ret;
 973}
 974
 975static int bq27000_battery_remove(struct platform_device *pdev)
 976{
 977        struct bq27x00_device_info *di = platform_get_drvdata(pdev);
 978
 979        bq27x00_powersupply_unregister(di);
 980
 981        platform_set_drvdata(pdev, NULL);
 982        kfree(di);
 983
 984        return 0;
 985}
 986
 987static struct platform_driver bq27000_battery_driver = {
 988        .probe  = bq27000_battery_probe,
 989        .remove = bq27000_battery_remove,
 990        .driver = {
 991                .name = "bq27000-battery",
 992                .owner = THIS_MODULE,
 993        },
 994};
 995
 996static inline int bq27x00_battery_platform_init(void)
 997{
 998        int ret = platform_driver_register(&bq27000_battery_driver);
 999        if (ret)
1000                printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
1001
1002        return ret;
1003}
1004
1005static inline void bq27x00_battery_platform_exit(void)
1006{
1007        platform_driver_unregister(&bq27000_battery_driver);
1008}
1009
1010#else
1011
1012static inline int bq27x00_battery_platform_init(void) { return 0; }
1013static inline void bq27x00_battery_platform_exit(void) {};
1014
1015#endif
1016
1017/*
1018 * Module stuff
1019 */
1020
1021static int __init bq27x00_battery_init(void)
1022{
1023        int ret;
1024
1025        ret = bq27x00_battery_i2c_init();
1026        if (ret)
1027                return ret;
1028
1029        ret = bq27x00_battery_platform_init();
1030        if (ret)
1031                bq27x00_battery_i2c_exit();
1032
1033        return ret;
1034}
1035module_init(bq27x00_battery_init);
1036
1037static void __exit bq27x00_battery_exit(void)
1038{
1039        bq27x00_battery_platform_exit();
1040        bq27x00_battery_i2c_exit();
1041}
1042module_exit(bq27x00_battery_exit);
1043
1044MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1045MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1046MODULE_LICENSE("GPL");
1047
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