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        return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
 234}
 235
 236/*
 237 * Return the battery Last measured discharge in µAh
 238 * Or < 0 if something fails.
 239 */
 240static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
 241{
 242        return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
 243}
 244
 245/*
 246 * Return the battery Initial last measured discharge in µAh
 247 * Or < 0 if something fails.
 248 */
 249static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
 250{
 251        int ilmd;
 252
 253        if (bq27xxx_is_chip_version_higher(di))
 254                ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
 255        else
 256                ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
 257
 258        if (ilmd < 0) {
 259                dev_dbg(di->dev, "error reading initial last measured discharge\n");
 260                return ilmd;
 261        }
 262
 263        if (bq27xxx_is_chip_version_higher(di))
 264                ilmd *= 1000;
 265        else
 266                ilmd = ilmd * 256 * 3570 / BQ27000_RS;
 267
 268        return ilmd;
 269}
 270
 271/*
 272 * Return the battery Available energy in µWh
 273 * Or < 0 if something fails.
 274 */
 275static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
 276{
 277        int ae;
 278
 279        ae = bq27x00_read(di, BQ27x00_REG_AE, false);
 280        if (ae < 0) {
 281                dev_dbg(di->dev, "error reading available energy\n");
 282                return ae;
 283        }
 284
 285        if (di->chip == BQ27500)
 286                ae *= 1000;
 287        else
 288                ae = ae * 29200 / BQ27000_RS;
 289
 290        return ae;
 291}
 292
 293/*
 294 * Return the battery temperature in tenths of degree Celsius
 295 * Or < 0 if something fails.
 296 */
 297static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
 298{
 299        int temp;
 300
 301        temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
 302        if (temp < 0) {
 303                dev_err(di->dev, "error reading temperature\n");
 304                return temp;
 305        }
 306
 307        if (bq27xxx_is_chip_version_higher(di))
 308                temp -= 2731;
 309        else
 310                temp = ((temp * 5) - 5463) / 2;
 311
 312        return temp;
 313}
 314
 315/*
 316 * Return the battery Cycle count total
 317 * Or < 0 if something fails.
 318 */
 319static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
 320{
 321        int cyct;
 322
 323        cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
 324        if (cyct < 0)
 325                dev_err(di->dev, "error reading cycle count total\n");
 326
 327        return cyct;
 328}
 329
 330/*
 331 * Read a time register.
 332 * Return < 0 if something fails.
 333 */
 334static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
 335{
 336        int tval;
 337
 338        tval = bq27x00_read(di, reg, false);
 339        if (tval < 0) {
 340                dev_dbg(di->dev, "error reading time register %02x: %d\n",
 341                        reg, tval);
 342                return tval;
 343        }
 344
 345        if (tval == 65535)
 346                return -ENODATA;
 347
 348        return tval * 60;
 349}
 350
 351/*
 352 * Read a power avg register.
 353 * Return < 0 if something fails.
 354 */
 355static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
 356{
 357        int tval;
 358
 359        tval = bq27x00_read(di, reg, false);
 360        if (tval < 0) {
 361                dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
 362                        reg, tval);
 363                return tval;
 364        }
 365
 366        if (di->chip == BQ27500)
 367                return tval;
 368        else
 369                return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
 370}
 371
 372/*
 373 * Read flag register.
 374 * Return < 0 if something fails.
 375 */
 376static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
 377{
 378        int tval;
 379
 380        tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 381        if (tval < 0) {
 382                dev_err(di->dev, "error reading flag register:%d\n", tval);
 383                return tval;
 384        }
 385
 386        if ((di->chip == BQ27500)) {
 387                if (tval & BQ27500_FLAG_SOCF)
 388                        tval = POWER_SUPPLY_HEALTH_DEAD;
 389                else if (tval & BQ27500_FLAG_OTC)
 390                        tval = POWER_SUPPLY_HEALTH_OVERHEAT;
 391                else
 392                        tval = POWER_SUPPLY_HEALTH_GOOD;
 393                return tval;
 394        } else {
 395                if (tval & BQ27000_FLAG_EDV1)
 396                        tval = POWER_SUPPLY_HEALTH_DEAD;
 397                else
 398                        tval = POWER_SUPPLY_HEALTH_GOOD;
 399                return tval;
 400        }
 401
 402        return -1;
 403}
 404
 405static void bq27x00_update(struct bq27x00_device_info *di)
 406{
 407        struct bq27x00_reg_cache cache = {0, };
 408        bool is_bq27500 = di->chip == BQ27500;
 409        bool is_bq27425 = di->chip == BQ27425;
 410
 411        cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
 412        if (cache.flags >= 0) {
 413                if (!is_bq27500 && !is_bq27425
 414                                && (cache.flags & BQ27000_FLAG_CI)) {
 415                        dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
 416                        cache.capacity = -ENODATA;
 417                        cache.energy = -ENODATA;
 418                        cache.time_to_empty = -ENODATA;
 419                        cache.time_to_empty_avg = -ENODATA;
 420                        cache.time_to_full = -ENODATA;
 421                        cache.charge_full = -ENODATA;
 422                        cache.health = -ENODATA;
 423                } else {
 424                        cache.capacity = bq27x00_battery_read_rsoc(di);
 425                        if (!is_bq27425) {
 426                                cache.energy = bq27x00_battery_read_energy(di);
 427                                cache.time_to_empty =
 428                                        bq27x00_battery_read_time(di,
 429                                                        BQ27x00_REG_TTE);
 430                                cache.time_to_empty_avg =
 431                                        bq27x00_battery_read_time(di,
 432                                                        BQ27x00_REG_TTECP);
 433                                cache.time_to_full =
 434                                        bq27x00_battery_read_time(di,
 435                                                        BQ27x00_REG_TTF);
 436                        }
 437                        cache.charge_full = bq27x00_battery_read_lmd(di);
 438                        cache.health = bq27x00_battery_read_health(di);
 439                }
 440                cache.temperature = bq27x00_battery_read_temperature(di);
 441                if (!is_bq27425)
 442                        cache.cycle_count = bq27x00_battery_read_cyct(di);
 443                cache.cycle_count = bq27x00_battery_read_cyct(di);
 444                cache.power_avg =
 445                        bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
 446
 447                /* We only have to read charge design full once */
 448                if (di->charge_design_full <= 0)
 449                        di->charge_design_full = bq27x00_battery_read_ilmd(di);
 450        }
 451
 452        if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
 453                di->cache = cache;
 454                power_supply_changed(&di->bat);
 455        }
 456
 457        di->last_update = jiffies;
 458}
 459
 460static void bq27x00_battery_poll(struct work_struct *work)
 461{
 462        struct bq27x00_device_info *di =
 463                container_of(work, struct bq27x00_device_info, work.work);
 464
 465        bq27x00_update(di);
 466
 467        if (poll_interval > 0) {
 468                /* The timer does not have to be accurate. */
 469                set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
 470                schedule_delayed_work(&di->work, poll_interval * HZ);
 471        }
 472}
 473
 474/*
 475 * Return the battery average current in µA
 476 * Note that current can be negative signed as well
 477 * Or 0 if something fails.
 478 */
 479static int bq27x00_battery_current(struct bq27x00_device_info *di,
 480        union power_supply_propval *val)
 481{
 482        int curr;
 483        int flags;
 484
 485        curr = bq27x00_read(di, BQ27x00_REG_AI, false);
 486        if (curr < 0) {
 487                dev_err(di->dev, "error reading current\n");
 488                return curr;
 489        }
 490
 491        if (bq27xxx_is_chip_version_higher(di)) {
 492                /* bq27500 returns signed value */
 493                val->intval = (int)((s16)curr) * 1000;
 494        } else {
 495                flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 496                if (flags & BQ27000_FLAG_CHGS) {
 497                        dev_dbg(di->dev, "negative current!\n");
 498                        curr = -curr;
 499                }
 500
 501                val->intval = curr * 3570 / BQ27000_RS;
 502        }
 503
 504        return 0;
 505}
 506
 507static int bq27x00_battery_status(struct bq27x00_device_info *di,
 508        union power_supply_propval *val)
 509{
 510        int status;
 511
 512        if (bq27xxx_is_chip_version_higher(di)) {
 513                if (di->cache.flags & BQ27500_FLAG_FC)
 514                        status = POWER_SUPPLY_STATUS_FULL;
 515                else if (di->cache.flags & BQ27500_FLAG_DSC)
 516                        status = POWER_SUPPLY_STATUS_DISCHARGING;
 517                else
 518                        status = POWER_SUPPLY_STATUS_CHARGING;
 519        } else {
 520                if (di->cache.flags & BQ27000_FLAG_FC)
 521                        status = POWER_SUPPLY_STATUS_FULL;
 522                else if (di->cache.flags & BQ27000_FLAG_CHGS)
 523                        status = POWER_SUPPLY_STATUS_CHARGING;
 524                else if (power_supply_am_i_supplied(&di->bat))
 525                        status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 526                else
 527                        status = POWER_SUPPLY_STATUS_DISCHARGING;
 528        }
 529
 530        val->intval = status;
 531
 532        return 0;
 533}
 534
 535static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
 536        union power_supply_propval *val)
 537{
 538        int level;
 539
 540        if (bq27xxx_is_chip_version_higher(di)) {
 541                if (di->cache.flags & BQ27500_FLAG_FC)
 542                        level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 543                else if (di->cache.flags & BQ27500_FLAG_SOC1)
 544                        level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 545                else if (di->cache.flags & BQ27500_FLAG_SOCF)
 546                        level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 547                else
 548                        level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 549        } else {
 550                if (di->cache.flags & BQ27000_FLAG_FC)
 551                        level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 552                else if (di->cache.flags & BQ27000_FLAG_EDV1)
 553                        level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 554                else if (di->cache.flags & BQ27000_FLAG_EDVF)
 555                        level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 556                else
 557                        level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 558        }
 559
 560        val->intval = level;
 561
 562        return 0;
 563}
 564
 565/*
 566 * Return the battery Voltage in millivolts
 567 * Or < 0 if something fails.
 568 */
 569static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
 570        union power_supply_propval *val)
 571{
 572        int volt;
 573
 574        volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
 575        if (volt < 0) {
 576                dev_err(di->dev, "error reading voltage\n");
 577                return volt;
 578        }
 579
 580        val->intval = volt * 1000;
 581
 582        return 0;
 583}
 584
 585static int bq27x00_simple_value(int value,
 586        union power_supply_propval *val)
 587{
 588        if (value < 0)
 589                return value;
 590
 591        val->intval = value;
 592
 593        return 0;
 594}
 595
 596#define to_bq27x00_device_info(x) container_of((x), \
 597                                struct bq27x00_device_info, bat);
 598
 599static int bq27x00_battery_get_property(struct power_supply *psy,
 600                                        enum power_supply_property psp,
 601                                        union power_supply_propval *val)
 602{
 603        int ret = 0;
 604        struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 605
 606        mutex_lock(&di->lock);
 607        if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 608                cancel_delayed_work_sync(&di->work);
 609                bq27x00_battery_poll(&di->work.work);
 610        }
 611        mutex_unlock(&di->lock);
 612
 613        if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 614                return -ENODEV;
 615
 616        switch (psp) {
 617        case POWER_SUPPLY_PROP_STATUS:
 618                ret = bq27x00_battery_status(di, val);
 619                break;
 620        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 621                ret = bq27x00_battery_voltage(di, val);
 622                break;
 623        case POWER_SUPPLY_PROP_PRESENT:
 624                val->intval = di->cache.flags < 0 ? 0 : 1;
 625                break;
 626        case POWER_SUPPLY_PROP_CURRENT_NOW:
 627                ret = bq27x00_battery_current(di, val);
 628                break;
 629        case POWER_SUPPLY_PROP_CAPACITY:
 630                ret = bq27x00_simple_value(di->cache.capacity, val);
 631                break;
 632        case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 633                ret = bq27x00_battery_capacity_level(di, val);
 634                break;
 635        case POWER_SUPPLY_PROP_TEMP:
 636                ret = bq27x00_simple_value(di->cache.temperature, val);
 637                break;
 638        case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 639                ret = bq27x00_simple_value(di->cache.time_to_empty, val);
 640                break;
 641        case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 642                ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
 643                break;
 644        case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 645                ret = bq27x00_simple_value(di->cache.time_to_full, val);
 646                break;
 647        case POWER_SUPPLY_PROP_TECHNOLOGY:
 648                val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 649                break;
 650        case POWER_SUPPLY_PROP_CHARGE_NOW:
 651                ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
 652                break;
 653        case POWER_SUPPLY_PROP_CHARGE_FULL:
 654                ret = bq27x00_simple_value(di->cache.charge_full, val);
 655                break;
 656        case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 657                ret = bq27x00_simple_value(di->charge_design_full, val);
 658                break;
 659        case POWER_SUPPLY_PROP_CYCLE_COUNT:
 660                ret = bq27x00_simple_value(di->cache.cycle_count, val);
 661                break;
 662        case POWER_SUPPLY_PROP_ENERGY_NOW:
 663                ret = bq27x00_simple_value(di->cache.energy, val);
 664                break;
 665        case POWER_SUPPLY_PROP_POWER_AVG:
 666                ret = bq27x00_simple_value(di->cache.power_avg, val);
 667                break;
 668        case POWER_SUPPLY_PROP_HEALTH:
 669                ret = bq27x00_simple_value(di->cache.health, val);
 670                break;
 671        default:
 672                return -EINVAL;
 673        }
 674
 675        return ret;
 676}
 677
 678static void bq27x00_external_power_changed(struct power_supply *psy)
 679{
 680        struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 681
 682        cancel_delayed_work_sync(&di->work);
 683        schedule_delayed_work(&di->work, 0);
 684}
 685
 686static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
 687{
 688        int ret;
 689
 690        di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 691        di->chip = BQ27425;
 692        if (di->chip == BQ27425) {
 693                di->bat.properties = bq27425_battery_props;
 694                di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
 695        } else {
 696                di->bat.properties = bq27x00_battery_props;
 697                di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
 698        }
 699        di->bat.get_property = bq27x00_battery_get_property;
 700        di->bat.external_power_changed = bq27x00_external_power_changed;
 701
 702        INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
 703        mutex_init(&di->lock);
 704
 705        ret = power_supply_register(di->dev, &di->bat);
 706        if (ret) {
 707                dev_err(di->dev, "failed to register battery: %d\n", ret);
 708                return ret;
 709        }
 710
 711        dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 712
 713        bq27x00_update(di);
 714
 715        return 0;
 716}
 717
 718static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
 719{
 720        /*
 721         * power_supply_unregister call bq27x00_battery_get_property which
 722         * call bq27x00_battery_poll.
 723         * Make sure that bq27x00_battery_poll will not call
 724         * schedule_delayed_work again after unregister (which cause OOPS).
 725         */
 726        poll_interval = 0;
 727
 728        cancel_delayed_work_sync(&di->work);
 729
 730        power_supply_unregister(&di->bat);
 731
 732        mutex_destroy(&di->lock);
 733}
 734
 735
 736/* i2c specific code */
 737#ifdef CONFIG_BATTERY_BQ27X00_I2C
 738
 739/* If the system has several batteries we need a different name for each
 740 * of them...
 741 */
 742static DEFINE_IDR(battery_id);
 743static DEFINE_MUTEX(battery_mutex);
 744
 745static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
 746{
 747        struct i2c_client *client = to_i2c_client(di->dev);
 748        struct i2c_msg msg[2];
 749        unsigned char data[2];
 750        int ret;
 751
 752        if (!client->adapter)
 753                return -ENODEV;
 754
 755        msg[0].addr = client->addr;
 756        msg[0].flags = 0;
 757        msg[0].buf = &reg;
 758        msg[0].len = sizeof(reg);
 759        msg[1].addr = client->addr;
 760        msg[1].flags = I2C_M_RD;
 761        msg[1].buf = data;
 762        if (single)
 763                msg[1].len = 1;
 764        else
 765                msg[1].len = 2;
 766
 767        ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 768        if (ret < 0)
 769                return ret;
 770
 771        if (!single)
 772                ret = get_unaligned_le16(data);
 773        else
 774                ret = data[0];
 775
 776        return ret;
 777}
 778
 779static int bq27x00_battery_probe(struct i2c_client *client,
 780                                 const struct i2c_device_id *id)
 781{
 782        char *name;
 783        struct bq27x00_device_info *di;
 784        int num;
 785        int retval = 0;
 786
 787        /* Get new ID for the new battery device */
 788        retval = idr_pre_get(&battery_id, GFP_KERNEL);
 789        if (retval == 0)
 790                return -ENOMEM;
 791        mutex_lock(&battery_mutex);
 792        retval = idr_get_new(&battery_id, client, &num);
 793        mutex_unlock(&battery_mutex);
 794        if (retval < 0)
 795                return retval;
 796
 797        name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
 798        if (!name) {
 799                dev_err(&client->dev, "failed to allocate device name\n");
 800                retval = -ENOMEM;
 801                goto batt_failed_1;
 802        }
 803
 804        di = kzalloc(sizeof(*di), GFP_KERNEL);
 805        if (!di) {
 806                dev_err(&client->dev, "failed to allocate device info data\n");
 807                retval = -ENOMEM;
 808                goto batt_failed_2;
 809        }
 810
 811        di->id = num;
 812        di->dev = &client->dev;
 813        di->chip = id->driver_data;
 814        di->bat.name = name;
 815        di->bus.read = &bq27x00_read_i2c;
 816
 817        retval = bq27x00_powersupply_init(di);
 818        if (retval)
 819                goto batt_failed_3;
 820
 821        i2c_set_clientdata(client, di);
 822
 823        return 0;
 824
 825batt_failed_3:
 826        kfree(di);
 827batt_failed_2:
 828        kfree(name);
 829batt_failed_1:
 830        mutex_lock(&battery_mutex);
 831        idr_remove(&battery_id, num);
 832        mutex_unlock(&battery_mutex);
 833
 834        return retval;
 835}
 836
 837static int bq27x00_battery_remove(struct i2c_client *client)
 838{
 839        struct bq27x00_device_info *di = i2c_get_clientdata(client);
 840
 841        bq27x00_powersupply_unregister(di);
 842
 843        kfree(di->bat.name);
 844
 845        mutex_lock(&battery_mutex);
 846        idr_remove(&battery_id, di->id);
 847        mutex_unlock(&battery_mutex);
 848
 849        kfree(di);
 850
 851        return 0;
 852}
 853
 854static const struct i2c_device_id bq27x00_id[] = {
 855        { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
 856        { "bq27500", BQ27500 },
 857        { "bq27425", BQ27425 },
 858        {},
 859};
 860MODULE_DEVICE_TABLE(i2c, bq27x00_id);
 861
 862static struct i2c_driver bq27x00_battery_driver = {
 863        .driver = {
 864                .name = "bq27x00-battery",
 865        },
 866        .probe = bq27x00_battery_probe,
 867        .remove = bq27x00_battery_remove,
 868        .id_table = bq27x00_id,
 869};
 870
 871static inline int bq27x00_battery_i2c_init(void)
 872{
 873        int ret = i2c_add_driver(&bq27x00_battery_driver);
 874        if (ret)
 875                printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
 876
 877        return ret;
 878}
 879
 880static inline void bq27x00_battery_i2c_exit(void)
 881{
 882        i2c_del_driver(&bq27x00_battery_driver);
 883}
 884
 885#else
 886
 887static inline int bq27x00_battery_i2c_init(void) { return 0; }
 888static inline void bq27x00_battery_i2c_exit(void) {};
 889
 890#endif
 891
 892/* platform specific code */
 893#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
 894
 895static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
 896                        bool single)
 897{
 898        struct device *dev = di->dev;
 899        struct bq27000_platform_data *pdata = dev->platform_data;
 900        unsigned int timeout = 3;
 901        int upper, lower;
 902        int temp;
 903
 904        if (!single) {
 905                /* Make sure the value has not changed in between reading the
 906                 * lower and the upper part */
 907                upper = pdata->read(dev, reg + 1);
 908                do {
 909                        temp = upper;
 910                        if (upper < 0)
 911                                return upper;
 912
 913                        lower = pdata->read(dev, reg);
 914                        if (lower < 0)
 915                                return lower;
 916
 917                        upper = pdata->read(dev, reg + 1);
 918                } while (temp != upper && --timeout);
 919
 920                if (timeout == 0)
 921                        return -EIO;
 922
 923                return (upper << 8) | lower;
 924        }
 925
 926        return pdata->read(dev, reg);
 927}
 928
 929static int __devinit bq27000_battery_probe(struct platform_device *pdev)
 930{
 931        struct bq27x00_device_info *di;
 932        struct bq27000_platform_data *pdata = pdev->dev.platform_data;
 933        int ret;
 934
 935        if (!pdata) {
 936                dev_err(&pdev->dev, "no platform_data supplied\n");
 937                return -EINVAL;
 938        }
 939
 940        if (!pdata->read) {
 941                dev_err(&pdev->dev, "no hdq read callback supplied\n");
 942                return -EINVAL;
 943        }
 944
 945        di = kzalloc(sizeof(*di), GFP_KERNEL);
 946        if (!di) {
 947                dev_err(&pdev->dev, "failed to allocate device info data\n");
 948                return -ENOMEM;
 949        }
 950
 951        platform_set_drvdata(pdev, di);
 952
 953        di->dev = &pdev->dev;
 954        di->chip = BQ27000;
 955
 956        di->bat.name = pdata->name ?: dev_name(&pdev->dev);
 957        di->bus.read = &bq27000_read_platform;
 958
 959        ret = bq27x00_powersupply_init(di);
 960        if (ret)
 961                goto err_free;
 962
 963        return 0;
 964
 965err_free:
 966        platform_set_drvdata(pdev, NULL);
 967        kfree(di);
 968
 969        return ret;
 970}
 971
 972static int __devexit bq27000_battery_remove(struct platform_device *pdev)
 973{
 974        struct bq27x00_device_info *di = platform_get_drvdata(pdev);
 975
 976        bq27x00_powersupply_unregister(di);
 977
 978        platform_set_drvdata(pdev, NULL);
 979        kfree(di);
 980
 981        return 0;
 982}
 983
 984static struct platform_driver bq27000_battery_driver = {
 985        .probe  = bq27000_battery_probe,
 986        .remove = __devexit_p(bq27000_battery_remove),
 987        .driver = {
 988                .name = "bq27000-battery",
 989                .owner = THIS_MODULE,
 990        },
 991};
 992
 993static inline int bq27x00_battery_platform_init(void)
 994{
 995        int ret = platform_driver_register(&bq27000_battery_driver);
 996        if (ret)
 997                printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
 998
 999        return ret;
1000}
1001
1002static inline void bq27x00_battery_platform_exit(void)
1003{
1004        platform_driver_unregister(&bq27000_battery_driver);
1005}
1006
1007#else
1008
1009static inline int bq27x00_battery_platform_init(void) { return 0; }
1010static inline void bq27x00_battery_platform_exit(void) {};
1011
1012#endif
1013
1014/*
1015 * Module stuff
1016 */
1017
1018static int __init bq27x00_battery_init(void)
1019{
1020        int ret;
1021
1022        ret = bq27x00_battery_i2c_init();
1023        if (ret)
1024                return ret;
1025
1026        ret = bq27x00_battery_platform_init();
1027        if (ret)
1028                bq27x00_battery_i2c_exit();
1029
1030        return ret;
1031}
1032module_init(bq27x00_battery_init);
1033
1034static void __exit bq27x00_battery_exit(void)
1035{
1036        bq27x00_battery_platform_exit();
1037        bq27x00_battery_i2c_exit();
1038}
1039module_exit(bq27x00_battery_exit);
1040
1041MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1042MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1043MODULE_LICENSE("GPL");
1044
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