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 Celsius
 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 -= 2731;
 317        else
 318                temp = ((temp * 5) - 5463) / 2;
 319
 320        return temp;
 321}
 322
 323/*
 324 * Return the battery Cycle count total
 325 * Or < 0 if something fails.
 326 */
 327static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
 328{
 329        int cyct;
 330
 331        cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
 332        if (cyct < 0)
 333                dev_err(di->dev, "error reading cycle count total\n");
 334
 335        return cyct;
 336}
 337
 338/*
 339 * Read a time register.
 340 * Return < 0 if something fails.
 341 */
 342static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
 343{
 344        int tval;
 345
 346        tval = bq27x00_read(di, reg, false);
 347        if (tval < 0) {
 348                dev_dbg(di->dev, "error reading time register %02x: %d\n",
 349                        reg, tval);
 350                return tval;
 351        }
 352
 353        if (tval == 65535)
 354                return -ENODATA;
 355
 356        return tval * 60;
 357}
 358
 359/*
 360 * Read a power avg register.
 361 * Return < 0 if something fails.
 362 */
 363static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
 364{
 365        int tval;
 366
 367        tval = bq27x00_read(di, reg, false);
 368        if (tval < 0) {
 369                dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
 370                        reg, tval);
 371                return tval;
 372        }
 373
 374        if (di->chip == BQ27500)
 375                return tval;
 376        else
 377                return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
 378}
 379
 380/*
 381 * Read flag register.
 382 * Return < 0 if something fails.
 383 */
 384static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
 385{
 386        int tval;
 387
 388        tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 389        if (tval < 0) {
 390                dev_err(di->dev, "error reading flag register:%d\n", tval);
 391                return tval;
 392        }
 393
 394        if ((di->chip == BQ27500)) {
 395                if (tval & BQ27500_FLAG_SOCF)
 396                        tval = POWER_SUPPLY_HEALTH_DEAD;
 397                else if (tval & BQ27500_FLAG_OTC)
 398                        tval = POWER_SUPPLY_HEALTH_OVERHEAT;
 399                else
 400                        tval = POWER_SUPPLY_HEALTH_GOOD;
 401                return tval;
 402        } else {
 403                if (tval & BQ27000_FLAG_EDV1)
 404                        tval = POWER_SUPPLY_HEALTH_DEAD;
 405                else
 406                        tval = POWER_SUPPLY_HEALTH_GOOD;
 407                return tval;
 408        }
 409
 410        return -1;
 411}
 412
 413static void bq27x00_update(struct bq27x00_device_info *di)
 414{
 415        struct bq27x00_reg_cache cache = {0, };
 416        bool is_bq27500 = di->chip == BQ27500;
 417        bool is_bq27425 = di->chip == BQ27425;
 418
 419        cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
 420        if (cache.flags >= 0) {
 421                if (!is_bq27500 && !is_bq27425
 422                                && (cache.flags & BQ27000_FLAG_CI)) {
 423                        dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
 424                        cache.capacity = -ENODATA;
 425                        cache.energy = -ENODATA;
 426                        cache.time_to_empty = -ENODATA;
 427                        cache.time_to_empty_avg = -ENODATA;
 428                        cache.time_to_full = -ENODATA;
 429                        cache.charge_full = -ENODATA;
 430                        cache.health = -ENODATA;
 431                } else {
 432                        cache.capacity = bq27x00_battery_read_rsoc(di);
 433                        if (!is_bq27425) {
 434                                cache.energy = bq27x00_battery_read_energy(di);
 435                                cache.time_to_empty =
 436                                        bq27x00_battery_read_time(di,
 437                                                        BQ27x00_REG_TTE);
 438                                cache.time_to_empty_avg =
 439                                        bq27x00_battery_read_time(di,
 440                                                        BQ27x00_REG_TTECP);
 441                                cache.time_to_full =
 442                                        bq27x00_battery_read_time(di,
 443                                                        BQ27x00_REG_TTF);
 444                        }
 445                        cache.charge_full = bq27x00_battery_read_lmd(di);
 446                        cache.health = bq27x00_battery_read_health(di);
 447                }
 448                cache.temperature = bq27x00_battery_read_temperature(di);
 449                if (!is_bq27425)
 450                        cache.cycle_count = bq27x00_battery_read_cyct(di);
 451                cache.cycle_count = bq27x00_battery_read_cyct(di);
 452                cache.power_avg =
 453                        bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
 454
 455                /* We only have to read charge design full once */
 456                if (di->charge_design_full <= 0)
 457                        di->charge_design_full = bq27x00_battery_read_ilmd(di);
 458        }
 459
 460        if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
 461                di->cache = cache;
 462                power_supply_changed(&di->bat);
 463        }
 464
 465        di->last_update = jiffies;
 466}
 467
 468static void bq27x00_battery_poll(struct work_struct *work)
 469{
 470        struct bq27x00_device_info *di =
 471                container_of(work, struct bq27x00_device_info, work.work);
 472
 473        bq27x00_update(di);
 474
 475        if (poll_interval > 0) {
 476                /* The timer does not have to be accurate. */
 477                set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
 478                schedule_delayed_work(&di->work, poll_interval * HZ);
 479        }
 480}
 481
 482/*
 483 * Return the battery average current in µA
 484 * Note that current can be negative signed as well
 485 * Or 0 if something fails.
 486 */
 487static int bq27x00_battery_current(struct bq27x00_device_info *di,
 488        union power_supply_propval *val)
 489{
 490        int curr;
 491        int flags;
 492
 493        curr = bq27x00_read(di, BQ27x00_REG_AI, false);
 494        if (curr < 0) {
 495                dev_err(di->dev, "error reading current\n");
 496                return curr;
 497        }
 498
 499        if (bq27xxx_is_chip_version_higher(di)) {
 500                /* bq27500 returns signed value */
 501                val->intval = (int)((s16)curr) * 1000;
 502        } else {
 503                flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 504                if (flags & BQ27000_FLAG_CHGS) {
 505                        dev_dbg(di->dev, "negative current!\n");
 506                        curr = -curr;
 507                }
 508
 509                val->intval = curr * 3570 / BQ27000_RS;
 510        }
 511
 512        return 0;
 513}
 514
 515static int bq27x00_battery_status(struct bq27x00_device_info *di,
 516        union power_supply_propval *val)
 517{
 518        int status;
 519
 520        if (bq27xxx_is_chip_version_higher(di)) {
 521                if (di->cache.flags & BQ27500_FLAG_FC)
 522                        status = POWER_SUPPLY_STATUS_FULL;
 523                else if (di->cache.flags & BQ27500_FLAG_DSC)
 524                        status = POWER_SUPPLY_STATUS_DISCHARGING;
 525                else
 526                        status = POWER_SUPPLY_STATUS_CHARGING;
 527        } else {
 528                if (di->cache.flags & BQ27000_FLAG_FC)
 529                        status = POWER_SUPPLY_STATUS_FULL;
 530                else if (di->cache.flags & BQ27000_FLAG_CHGS)
 531                        status = POWER_SUPPLY_STATUS_CHARGING;
 532                else if (power_supply_am_i_supplied(&di->bat))
 533                        status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 534                else
 535                        status = POWER_SUPPLY_STATUS_DISCHARGING;
 536        }
 537
 538        val->intval = status;
 539
 540        return 0;
 541}
 542
 543static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
 544        union power_supply_propval *val)
 545{
 546        int level;
 547
 548        if (bq27xxx_is_chip_version_higher(di)) {
 549                if (di->cache.flags & BQ27500_FLAG_FC)
 550                        level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 551                else if (di->cache.flags & BQ27500_FLAG_SOC1)
 552                        level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 553                else if (di->cache.flags & BQ27500_FLAG_SOCF)
 554                        level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 555                else
 556                        level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 557        } else {
 558                if (di->cache.flags & BQ27000_FLAG_FC)
 559                        level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 560                else if (di->cache.flags & BQ27000_FLAG_EDV1)
 561                        level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 562                else if (di->cache.flags & BQ27000_FLAG_EDVF)
 563                        level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 564                else
 565                        level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 566        }
 567
 568        val->intval = level;
 569
 570        return 0;
 571}
 572
 573/*
 574 * Return the battery Voltage in millivolts
 575 * Or < 0 if something fails.
 576 */
 577static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
 578        union power_supply_propval *val)
 579{
 580        int volt;
 581
 582        volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
 583        if (volt < 0) {
 584                dev_err(di->dev, "error reading voltage\n");
 585                return volt;
 586        }
 587
 588        val->intval = volt * 1000;
 589
 590        return 0;
 591}
 592
 593static int bq27x00_simple_value(int value,
 594        union power_supply_propval *val)
 595{
 596        if (value < 0)
 597                return value;
 598
 599        val->intval = value;
 600
 601        return 0;
 602}
 603
 604#define to_bq27x00_device_info(x) container_of((x), \
 605                                struct bq27x00_device_info, bat);
 606
 607static int bq27x00_battery_get_property(struct power_supply *psy,
 608                                        enum power_supply_property psp,
 609                                        union power_supply_propval *val)
 610{
 611        int ret = 0;
 612        struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 613
 614        mutex_lock(&di->lock);
 615        if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 616                cancel_delayed_work_sync(&di->work);
 617                bq27x00_battery_poll(&di->work.work);
 618        }
 619        mutex_unlock(&di->lock);
 620
 621        if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 622                return -ENODEV;
 623
 624        switch (psp) {
 625        case POWER_SUPPLY_PROP_STATUS:
 626                ret = bq27x00_battery_status(di, val);
 627                break;
 628        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 629                ret = bq27x00_battery_voltage(di, val);
 630                break;
 631        case POWER_SUPPLY_PROP_PRESENT:
 632                val->intval = di->cache.flags < 0 ? 0 : 1;
 633                break;
 634        case POWER_SUPPLY_PROP_CURRENT_NOW:
 635                ret = bq27x00_battery_current(di, val);
 636                break;
 637        case POWER_SUPPLY_PROP_CAPACITY:
 638                ret = bq27x00_simple_value(di->cache.capacity, val);
 639                break;
 640        case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 641                ret = bq27x00_battery_capacity_level(di, val);
 642                break;
 643        case POWER_SUPPLY_PROP_TEMP:
 644                ret = bq27x00_simple_value(di->cache.temperature, val);
 645                break;
 646        case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 647                ret = bq27x00_simple_value(di->cache.time_to_empty, val);
 648                break;
 649        case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 650                ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
 651                break;
 652        case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 653                ret = bq27x00_simple_value(di->cache.time_to_full, val);
 654                break;
 655        case POWER_SUPPLY_PROP_TECHNOLOGY:
 656                val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 657                break;
 658        case POWER_SUPPLY_PROP_CHARGE_NOW:
 659                ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
 660                break;
 661        case POWER_SUPPLY_PROP_CHARGE_FULL:
 662                ret = bq27x00_simple_value(di->cache.charge_full, val);
 663                break;
 664        case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 665                ret = bq27x00_simple_value(di->charge_design_full, val);
 666                break;
 667        case POWER_SUPPLY_PROP_CYCLE_COUNT:
 668                ret = bq27x00_simple_value(di->cache.cycle_count, val);
 669                break;
 670        case POWER_SUPPLY_PROP_ENERGY_NOW:
 671                ret = bq27x00_simple_value(di->cache.energy, val);
 672                break;
 673        case POWER_SUPPLY_PROP_POWER_AVG:
 674                ret = bq27x00_simple_value(di->cache.power_avg, val);
 675                break;
 676        case POWER_SUPPLY_PROP_HEALTH:
 677                ret = bq27x00_simple_value(di->cache.health, val);
 678                break;
 679        default:
 680                return -EINVAL;
 681        }
 682
 683        return ret;
 684}
 685
 686static void bq27x00_external_power_changed(struct power_supply *psy)
 687{
 688        struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 689
 690        cancel_delayed_work_sync(&di->work);
 691        schedule_delayed_work(&di->work, 0);
 692}
 693
 694static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
 695{
 696        int ret;
 697
 698        di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 699        di->chip = BQ27425;
 700        if (di->chip == BQ27425) {
 701                di->bat.properties = bq27425_battery_props;
 702                di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
 703        } else {
 704                di->bat.properties = bq27x00_battery_props;
 705                di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
 706        }
 707        di->bat.get_property = bq27x00_battery_get_property;
 708        di->bat.external_power_changed = bq27x00_external_power_changed;
 709
 710        INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
 711        mutex_init(&di->lock);
 712
 713        ret = power_supply_register(di->dev, &di->bat);
 714        if (ret) {
 715                dev_err(di->dev, "failed to register battery: %d\n", ret);
 716                return ret;
 717        }
 718
 719        dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 720
 721        bq27x00_update(di);
 722
 723        return 0;
 724}
 725
 726static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
 727{
 728        /*
 729         * power_supply_unregister call bq27x00_battery_get_property which
 730         * call bq27x00_battery_poll.
 731         * Make sure that bq27x00_battery_poll will not call
 732         * schedule_delayed_work again after unregister (which cause OOPS).
 733         */
 734        poll_interval = 0;
 735
 736        cancel_delayed_work_sync(&di->work);
 737
 738        power_supply_unregister(&di->bat);
 739
 740        mutex_destroy(&di->lock);
 741}
 742
 743
 744/* i2c specific code */
 745#ifdef CONFIG_BATTERY_BQ27X00_I2C
 746
 747/* If the system has several batteries we need a different name for each
 748 * of them...
 749 */
 750static DEFINE_IDR(battery_id);
 751static DEFINE_MUTEX(battery_mutex);
 752
 753static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
 754{
 755        struct i2c_client *client = to_i2c_client(di->dev);
 756        struct i2c_msg msg[2];
 757        unsigned char data[2];
 758        int ret;
 759
 760        if (!client->adapter)
 761                return -ENODEV;
 762
 763        msg[0].addr = client->addr;
 764        msg[0].flags = 0;
 765        msg[0].buf = &reg;
 766        msg[0].len = sizeof(reg);
 767        msg[1].addr = client->addr;
 768        msg[1].flags = I2C_M_RD;
 769        msg[1].buf = data;
 770        if (single)
 771                msg[1].len = 1;
 772        else
 773                msg[1].len = 2;
 774
 775        ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 776        if (ret < 0)
 777                return ret;
 778
 779        if (!single)
 780                ret = get_unaligned_le16(data);
 781        else
 782                ret = data[0];
 783
 784        return ret;
 785}
 786
 787static int bq27x00_battery_probe(struct i2c_client *client,
 788                                 const struct i2c_device_id *id)
 789{
 790        char *name;
 791        struct bq27x00_device_info *di;
 792        int num;
 793        int retval = 0;
 794
 795        /* Get new ID for the new battery device */
 796        retval = idr_pre_get(&battery_id, GFP_KERNEL);
 797        if (retval == 0)
 798                return -ENOMEM;
 799        mutex_lock(&battery_mutex);
 800        retval = idr_get_new(&battery_id, client, &num);
 801        mutex_unlock(&battery_mutex);
 802        if (retval < 0)
 803                return retval;
 804
 805        name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
 806        if (!name) {
 807                dev_err(&client->dev, "failed to allocate device name\n");
 808                retval = -ENOMEM;
 809                goto batt_failed_1;
 810        }
 811
 812        di = kzalloc(sizeof(*di), GFP_KERNEL);
 813        if (!di) {
 814                dev_err(&client->dev, "failed to allocate device info data\n");
 815                retval = -ENOMEM;
 816                goto batt_failed_2;
 817        }
 818
 819        di->id = num;
 820        di->dev = &client->dev;
 821        di->chip = id->driver_data;
 822        di->bat.name = name;
 823        di->bus.read = &bq27x00_read_i2c;
 824
 825        retval = bq27x00_powersupply_init(di);
 826        if (retval)
 827                goto batt_failed_3;
 828
 829        i2c_set_clientdata(client, di);
 830
 831        return 0;
 832
 833batt_failed_3:
 834        kfree(di);
 835batt_failed_2:
 836        kfree(name);
 837batt_failed_1:
 838        mutex_lock(&battery_mutex);
 839        idr_remove(&battery_id, num);
 840        mutex_unlock(&battery_mutex);
 841
 842        return retval;
 843}
 844
 845static int bq27x00_battery_remove(struct i2c_client *client)
 846{
 847        struct bq27x00_device_info *di = i2c_get_clientdata(client);
 848
 849        bq27x00_powersupply_unregister(di);
 850
 851        kfree(di->bat.name);
 852
 853        mutex_lock(&battery_mutex);
 854        idr_remove(&battery_id, di->id);
 855        mutex_unlock(&battery_mutex);
 856
 857        kfree(di);
 858
 859        return 0;
 860}
 861
 862static const struct i2c_device_id bq27x00_id[] = {
 863        { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
 864        { "bq27500", BQ27500 },
 865        { "bq27425", BQ27425 },
 866        {},
 867};
 868MODULE_DEVICE_TABLE(i2c, bq27x00_id);
 869
 870static struct i2c_driver bq27x00_battery_driver = {
 871        .driver = {
 872                .name = "bq27x00-battery",
 873        },
 874        .probe = bq27x00_battery_probe,
 875        .remove = bq27x00_battery_remove,
 876        .id_table = bq27x00_id,
 877};
 878
 879static inline int bq27x00_battery_i2c_init(void)
 880{
 881        int ret = i2c_add_driver(&bq27x00_battery_driver);
 882        if (ret)
 883                printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
 884
 885        return ret;
 886}
 887
 888static inline void bq27x00_battery_i2c_exit(void)
 889{
 890        i2c_del_driver(&bq27x00_battery_driver);
 891}
 892
 893#else
 894
 895static inline int bq27x00_battery_i2c_init(void) { return 0; }
 896static inline void bq27x00_battery_i2c_exit(void) {};
 897
 898#endif
 899
 900/* platform specific code */
 901#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
 902
 903static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
 904                        bool single)
 905{
 906        struct device *dev = di->dev;
 907        struct bq27000_platform_data *pdata = dev->platform_data;
 908        unsigned int timeout = 3;
 909        int upper, lower;
 910        int temp;
 911
 912        if (!single) {
 913                /* Make sure the value has not changed in between reading the
 914                 * lower and the upper part */
 915                upper = pdata->read(dev, reg + 1);
 916                do {
 917                        temp = upper;
 918                        if (upper < 0)
 919                                return upper;
 920
 921                        lower = pdata->read(dev, reg);
 922                        if (lower < 0)
 923                                return lower;
 924
 925                        upper = pdata->read(dev, reg + 1);
 926                } while (temp != upper && --timeout);
 927
 928                if (timeout == 0)
 929                        return -EIO;
 930
 931                return (upper << 8) | lower;
 932        }
 933
 934        return pdata->read(dev, reg);
 935}
 936
 937static int bq27000_battery_probe(struct platform_device *pdev)
 938{
 939        struct bq27x00_device_info *di;
 940        struct bq27000_platform_data *pdata = pdev->dev.platform_data;
 941        int ret;
 942
 943        if (!pdata) {
 944                dev_err(&pdev->dev, "no platform_data supplied\n");
 945                return -EINVAL;
 946        }
 947
 948        if (!pdata->read) {
 949                dev_err(&pdev->dev, "no hdq read callback supplied\n");
 950                return -EINVAL;
 951        }
 952
 953        di = kzalloc(sizeof(*di), GFP_KERNEL);
 954        if (!di) {
 955                dev_err(&pdev->dev, "failed to allocate device info data\n");
 956                return -ENOMEM;
 957        }
 958
 959        platform_set_drvdata(pdev, di);
 960
 961        di->dev = &pdev->dev;
 962        di->chip = BQ27000;
 963
 964        di->bat.name = pdata->name ?: dev_name(&pdev->dev);
 965        di->bus.read = &bq27000_read_platform;
 966
 967        ret = bq27x00_powersupply_init(di);
 968        if (ret)
 969                goto err_free;
 970
 971        return 0;
 972
 973err_free:
 974        platform_set_drvdata(pdev, NULL);
 975        kfree(di);
 976
 977        return ret;
 978}
 979
 980static int bq27000_battery_remove(struct platform_device *pdev)
 981{
 982        struct bq27x00_device_info *di = platform_get_drvdata(pdev);
 983
 984        bq27x00_powersupply_unregister(di);
 985
 986        platform_set_drvdata(pdev, NULL);
 987        kfree(di);
 988
 989        return 0;
 990}
 991
 992static struct platform_driver bq27000_battery_driver = {
 993        .probe  = bq27000_battery_probe,
 994        .remove = bq27000_battery_remove,
 995        .driver = {
 996                .name = "bq27000-battery",
 997                .owner = THIS_MODULE,
 998        },
 999};
1000
1001static inline int bq27x00_battery_platform_init(void)
1002{
1003        int ret = platform_driver_register(&bq27000_battery_driver);
1004        if (ret)
1005                printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
1006
1007        return ret;
1008}
1009
1010static inline void bq27x00_battery_platform_exit(void)
1011{
1012        platform_driver_unregister(&bq27000_battery_driver);
1013}
1014
1015#else
1016
1017static inline int bq27x00_battery_platform_init(void) { return 0; }
1018static inline void bq27x00_battery_platform_exit(void) {};
1019
1020#endif
1021
1022/*
1023 * Module stuff
1024 */
1025
1026static int __init bq27x00_battery_init(void)
1027{
1028        int ret;
1029
1030        ret = bq27x00_battery_i2c_init();
1031        if (ret)
1032                return ret;
1033
1034        ret = bq27x00_battery_platform_init();
1035        if (ret)
1036                bq27x00_battery_i2c_exit();
1037
1038        return ret;
1039}
1040module_init(bq27x00_battery_init);
1041
1042static void __exit bq27x00_battery_exit(void)
1043{
1044        bq27x00_battery_platform_exit();
1045        bq27x00_battery_i2c_exit();
1046}
1047module_exit(bq27x00_battery_exit);
1048
1049MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1050MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1051MODULE_LICENSE("GPL");
1052
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