drivers/power/bq27x00_battery.c

   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  */
  26
  27 #include <linux/module.h>
  28 #include <linux/param.h>
  29 #include <linux/jiffies.h>
  30 #include <linux/workqueue.h>
  31 #include <linux/delay.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/power_supply.h>
  34 #include <linux/idr.h>
  35 #include <linux/i2c.h>
  36 #include <linux/slab.h>
  37 #include <asm/unaligned.h>
  38
  39 #include <linux/power/bq27x00_battery.h>
  40
  41 #define DRIVER_VERSION                  "1.2.0"
  42
  43 #define BQ27x00_REG_TEMP                0x06
  44 #define BQ27x00_REG_VOLT                0x08
  45 #define BQ27x00_REG_AI                  0x14
  46 #define BQ27x00_REG_FLAGS               0x0A
  47 #define BQ27x00_REG_TTE                 0x16
  48 #define BQ27x00_REG_TTF                 0x18
  49 #define BQ27x00_REG_TTECP               0x26
  50 #define BQ27x00_REG_NAC                 0x0C /* Nominal available capacity */
  51 #define BQ27x00_REG_LMD                 0x12 /* Last measured discharge */
  52 #define BQ27x00_REG_CYCT                0x2A /* Cycle count total */
  53 #define BQ27x00_REG_AE                  0x22 /* Available energy */
  54 #define BQ27x00_POWER_AVG               0x24
  55
  56 #define BQ27000_REG_RSOC                0x0B /* Relative State-of-Charge */
  57 #define BQ27000_REG_ILMD                0x76 /* Initial last measured discharge */
  58 #define BQ27000_FLAG_EDVF               BIT(0) /* Final End-of-Discharge-Voltage flag */
  59 #define BQ27000_FLAG_EDV1               BIT(1) /* First End-of-Discharge-Voltage flag */
  60 #define BQ27000_FLAG_CI                 BIT(4) /* Capacity Inaccurate flag */
  61 #define BQ27000_FLAG_FC                 BIT(5)
  62 #define BQ27000_FLAG_CHGS               BIT(7) /* Charge state flag */
  63
  64 #define BQ27500_REG_SOC                 0x2C
  65 #define BQ27500_REG_DCAP                0x3C /* Design capacity */
  66 #define BQ27500_FLAG_DSC                BIT(0)
  67 #define BQ27500_FLAG_SOCF               BIT(1) /* State-of-Charge threshold final */
  68 #define BQ27500_FLAG_SOC1               BIT(2) /* State-of-Charge threshold 1 */
  69 #define BQ27500_FLAG_FC                 BIT(9)
  70 #define BQ27500_FLAG_OTC                BIT(15)
  71
  72 #define BQ27000_RS                      20 /* Resistor sense */
  73 #define BQ27x00_POWER_CONSTANT          (256 * 29200 / 1000)
  74
  75 struct bq27x00_device_info;
  76 struct bq27x00_access_methods {
  77         int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
  78 };
  79
  80 enum bq27x00_chip { BQ27000, BQ27500 };
  81
  82 struct bq27x00_reg_cache {
  83         int temperature;
  84         int time_to_empty;
  85         int time_to_empty_avg;
  86         int time_to_full;
  87         int charge_full;
  88         int cycle_count;
  89         int capacity;
  90         int energy;
  91         int flags;
  92         int power_avg;
  93         int health;
  94 };
  95
  96 struct bq27x00_device_info {
  97         struct device           *dev;
  98         int                     id;
  99         enum bq27x00_chip       chip;
 100
 101         struct bq27x00_reg_cache cache;
 102         int charge_design_full;
 103
 104         unsigned long last_update;
 105         struct delayed_work work;
 106
 107         struct power_supply     bat;
 108
 109         struct bq27x00_access_methods bus;
 110
 111         struct mutex lock;
 112 };
 113
 114 static enum power_supply_property bq27x00_battery_props[] = {
 115         POWER_SUPPLY_PROP_STATUS,
 116         POWER_SUPPLY_PROP_PRESENT,
 117         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 118         POWER_SUPPLY_PROP_CURRENT_NOW,
 119         POWER_SUPPLY_PROP_CAPACITY,
 120         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 121         POWER_SUPPLY_PROP_TEMP,
 122         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 123         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 124         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 125         POWER_SUPPLY_PROP_TECHNOLOGY,
 126         POWER_SUPPLY_PROP_CHARGE_FULL,
 127         POWER_SUPPLY_PROP_CHARGE_NOW,
 128         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 129         POWER_SUPPLY_PROP_CYCLE_COUNT,
 130         POWER_SUPPLY_PROP_ENERGY_NOW,
 131         POWER_SUPPLY_PROP_POWER_AVG,
 132         POWER_SUPPLY_PROP_HEALTH,
 133 };
 134
 135 static unsigned int poll_interval = 360;
 136 module_param(poll_interval, uint, 0644);
 137 MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
 138                                 "0 disables polling");
 139
 140 /*
 141  * Common code for BQ27x00 devices
 142  */
 143
 144 static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
 145                 bool single)
 146 {
 147         return di->bus.read(di, reg, single);
 148 }
 149
 150 /*
 151  * Return the battery Relative State-of-Charge
 152  * Or < 0 if something fails.
 153  */
 154 static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
 155 {
 156         int rsoc;
 157
 158         if (di->chip == BQ27500)
 159                 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
 160         else
 161                 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
 162
 163         if (rsoc < 0)
 164                 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
 165
 166         return rsoc;
 167 }
 168
 169 /*
 170  * Return a battery charge value in µAh
 171  * Or < 0 if something fails.
 172  */
 173 static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
 174 {
 175         int charge;
 176
 177         charge = bq27x00_read(di, reg, false);
 178         if (charge < 0) {
 179                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 180                         reg, charge);
 181                 return charge;
 182         }
 183
 184         if (di->chip == BQ27500)
 185                 charge *= 1000;
 186         else
 187                 charge = charge * 3570 / BQ27000_RS;
 188
 189         return charge;
 190 }
 191
 192 /*
 193  * Return the battery Nominal available capaciy in µAh
 194  * Or < 0 if something fails.
 195  */
 196 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
 197 {
 198         return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
 199 }
 200
 201 /*
 202  * Return the battery Last measured discharge in µAh
 203  * Or < 0 if something fails.
 204  */
 205 static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
 206 {
 207         return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
 208 }
 209
 210 /*
 211  * Return the battery Initial last measured discharge in µAh
 212  * Or < 0 if something fails.
 213  */
 214 static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
 215 {
 216         int ilmd;
 217
 218         if (di->chip == BQ27500)
 219                 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
 220         else
 221                 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
 222
 223         if (ilmd < 0) {
 224                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 225                 return ilmd;
 226         }
 227
 228         if (di->chip == BQ27500)
 229                 ilmd *= 1000;
 230         else
 231                 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
 232
 233         return ilmd;
 234 }
 235
 236 /*
 237  * Return the battery Available energy in µWh
 238  * Or < 0 if something fails.
 239  */
 240 static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
 241 {
 242         int ae;
 243
 244         ae = bq27x00_read(di, BQ27x00_REG_AE, false);
 245         if (ae < 0) {
 246                 dev_dbg(di->dev, "error reading available energy\n");
 247                 return ae;
 248         }
 249
 250         if (di->chip == BQ27500)
 251                 ae *= 1000;
 252         else
 253                 ae = ae * 29200 / BQ27000_RS;
 254
 255         return ae;
 256 }
 257
 258 /*
 259  * Return the battery temperature in tenths of degree Celsius
 260  * Or < 0 if something fails.
 261  */
 262 static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
 263 {
 264         int temp;
 265
 266         temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
 267         if (temp < 0) {
 268                 dev_err(di->dev, "error reading temperature\n");
 269                 return temp;
 270         }
 271
 272         if (di->chip == BQ27500)
 273                 temp -= 2731;
 274         else
 275                 temp = ((temp * 5) - 5463) / 2;
 276
 277         return temp;
 278 }
 279
 280 /*
 281  * Return the battery Cycle count total
 282  * Or < 0 if something fails.
 283  */
 284 static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
 285 {
 286         int cyct;
 287
 288         cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
 289         if (cyct < 0)
 290                 dev_err(di->dev, "error reading cycle count total\n");
 291
 292         return cyct;
 293 }
 294
 295 /*
 296  * Read a time register.
 297  * Return < 0 if something fails.
 298  */
 299 static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
 300 {
 301         int tval;
 302
 303         tval = bq27x00_read(di, reg, false);
 304         if (tval < 0) {
 305                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 306                         reg, tval);
 307                 return tval;
 308         }
 309
 310         if (tval == 65535)
 311                 return -ENODATA;
 312
 313         return tval * 60;
 314 }
 315
 316 /*
 317  * Read a power avg register.
 318  * Return < 0 if something fails.
 319  */
 320 static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
 321 {
 322         int tval;
 323
 324         tval = bq27x00_read(di, reg, false);
 325         if (tval < 0) {
 326                 dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
 327                         reg, tval);
 328                 return tval;
 329         }
 330
 331         if (di->chip == BQ27500)
 332                 return tval;
 333         else
 334                 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
 335 }
 336
 337 /*
 338  * Read flag register.
 339  * Return < 0 if something fails.
 340  */
 341 static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
 342 {
 343         int tval;
 344
 345         tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 346         if (tval < 0) {
 347                 dev_err(di->dev, "error reading flag register:%d\n", tval);
 348                 return tval;
 349         }
 350
 351         if ((di->chip == BQ27500)) {
 352                 if (tval & BQ27500_FLAG_SOCF)
 353                         tval = POWER_SUPPLY_HEALTH_DEAD;
 354                 else if (tval & BQ27500_FLAG_OTC)
 355                         tval = POWER_SUPPLY_HEALTH_OVERHEAT;
 356                 else
 357                         tval = POWER_SUPPLY_HEALTH_GOOD;
 358                 return tval;
 359         } else {
 360                 if (tval & BQ27000_FLAG_EDV1)
 361                         tval = POWER_SUPPLY_HEALTH_DEAD;
 362                 else
 363                         tval = POWER_SUPPLY_HEALTH_GOOD;
 364                 return tval;
 365         }
 366
 367         return -1;
 368 }
 369
 370 static void bq27x00_update(struct bq27x00_device_info *di)
 371 {
 372         struct bq27x00_reg_cache cache = {0, };
 373         bool is_bq27500 = di->chip == BQ27500;
 374
 375         cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
 376         if (cache.flags >= 0) {
 377                 if (!is_bq27500 && (cache.flags & BQ27000_FLAG_CI)) {
 378                         dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
 379                         cache.capacity = -ENODATA;
 380                         cache.energy = -ENODATA;
 381                         cache.time_to_empty = -ENODATA;
 382                         cache.time_to_empty_avg = -ENODATA;
 383                         cache.time_to_full = -ENODATA;
 384                         cache.charge_full = -ENODATA;
 385                         cache.health = -ENODATA;
 386                 } else {
 387                         cache.capacity = bq27x00_battery_read_rsoc(di);
 388                         cache.energy = bq27x00_battery_read_energy(di);
 389                         cache.time_to_empty = bq27x00_battery_read_time(di, BQ27x00_REG_TTE);
 390                         cache.time_to_empty_avg = bq27x00_battery_read_time(di, BQ27x00_REG_TTECP);
 391                         cache.time_to_full = bq27x00_battery_read_time(di, BQ27x00_REG_TTF);
 392                         cache.charge_full = bq27x00_battery_read_lmd(di);
 393                         cache.health = bq27x00_battery_read_health(di);
 394                 }
 395                 cache.temperature = bq27x00_battery_read_temperature(di);
 396                 cache.cycle_count = bq27x00_battery_read_cyct(di);
 397                 cache.power_avg =
 398                         bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
 399
 400                 /* We only have to read charge design full once */
 401                 if (di->charge_design_full <= 0)
 402                         di->charge_design_full = bq27x00_battery_read_ilmd(di);
 403         }
 404
 405         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
 406                 di->cache = cache;
 407                 power_supply_changed(&di->bat);
 408         }
 409
 410         di->last_update = jiffies;
 411 }
 412
 413 static void bq27x00_battery_poll(struct work_struct *work)
 414 {
 415         struct bq27x00_device_info *di =
 416                 container_of(work, struct bq27x00_device_info, work.work);
 417
 418         bq27x00_update(di);
 419
 420         if (poll_interval > 0) {
 421                 /* The timer does not have to be accurate. */
 422                 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
 423                 schedule_delayed_work(&di->work, poll_interval * HZ);
 424         }
 425 }
 426
 427 /*
 428  * Return the battery average current in µA
 429  * Note that current can be negative signed as well
 430  * Or 0 if something fails.
 431  */
 432 static int bq27x00_battery_current(struct bq27x00_device_info *di,
 433         union power_supply_propval *val)
 434 {
 435         int curr;
 436         int flags;
 437
 438         curr = bq27x00_read(di, BQ27x00_REG_AI, false);
 439         if (curr < 0) {
 440                 dev_err(di->dev, "error reading current\n");
 441                 return curr;
 442         }
 443
 444         if (di->chip == BQ27500) {
 445                 /* bq27500 returns signed value */
 446                 val->intval = (int)((s16)curr) * 1000;
 447         } else {
 448                 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 449                 if (flags & BQ27000_FLAG_CHGS) {
 450                         dev_dbg(di->dev, "negative current!\n");
 451                         curr = -curr;
 452                 }
 453
 454                 val->intval = curr * 3570 / BQ27000_RS;
 455         }
 456
 457         return 0;
 458 }
 459
 460 static int bq27x00_battery_status(struct bq27x00_device_info *di,
 461         union power_supply_propval *val)
 462 {
 463         int status;
 464
 465         if (di->chip == BQ27500) {
 466                 if (di->cache.flags & BQ27500_FLAG_FC)
 467                         status = POWER_SUPPLY_STATUS_FULL;
 468                 else if (di->cache.flags & BQ27500_FLAG_DSC)
 469                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 470                 else
 471                         status = POWER_SUPPLY_STATUS_CHARGING;
 472         } else {
 473                 if (di->cache.flags & BQ27000_FLAG_FC)
 474                         status = POWER_SUPPLY_STATUS_FULL;
 475                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 476                         status = POWER_SUPPLY_STATUS_CHARGING;
 477                 else if (power_supply_am_i_supplied(&di->bat))
 478                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 479                 else
 480                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 481         }
 482
 483         val->intval = status;
 484
 485         return 0;
 486 }
 487
 488 static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
 489         union power_supply_propval *val)
 490 {
 491         int level;
 492
 493         if (di->chip == BQ27500) {
 494                 if (di->cache.flags & BQ27500_FLAG_FC)
 495                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 496                 else if (di->cache.flags & BQ27500_FLAG_SOC1)
 497                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 498                 else if (di->cache.flags & BQ27500_FLAG_SOCF)
 499                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 500                 else
 501                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 502         } else {
 503                 if (di->cache.flags & BQ27000_FLAG_FC)
 504                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 505                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 506                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 507                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 508                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 509                 else
 510                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 511         }
 512
 513         val->intval = level;
 514
 515         return 0;
 516 }
 517
 518 /*
 519  * Return the battery Voltage in millivolts
 520  * Or < 0 if something fails.
 521  */
 522 static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
 523         union power_supply_propval *val)
 524 {
 525         int volt;
 526
 527         volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
 528         if (volt < 0) {
 529                 dev_err(di->dev, "error reading voltage\n");
 530                 return volt;
 531         }
 532
 533         val->intval = volt * 1000;
 534
 535         return 0;
 536 }
 537
 538 static int bq27x00_simple_value(int value,
 539         union power_supply_propval *val)
 540 {
 541         if (value < 0)
 542                 return value;
 543
 544         val->intval = value;
 545
 546         return 0;
 547 }
 548
 549 #define to_bq27x00_device_info(x) container_of((x), \
 550                                 struct bq27x00_device_info, bat);
 551
 552 static int bq27x00_battery_get_property(struct power_supply *psy,
 553                                         enum power_supply_property psp,
 554                                         union power_supply_propval *val)
 555 {
 556         int ret = 0;
 557         struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 558
 559         mutex_lock(&di->lock);
 560         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 561                 cancel_delayed_work_sync(&di->work);
 562                 bq27x00_battery_poll(&di->work.work);
 563         }
 564         mutex_unlock(&di->lock);
 565
 566         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 567                 return -ENODEV;
 568
 569         switch (psp) {
 570         case POWER_SUPPLY_PROP_STATUS:
 571                 ret = bq27x00_battery_status(di, val);
 572                 break;
 573         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 574                 ret = bq27x00_battery_voltage(di, val);
 575                 break;
 576         case POWER_SUPPLY_PROP_PRESENT:
 577                 val->intval = di->cache.flags < 0 ? 0 : 1;
 578                 break;
 579         case POWER_SUPPLY_PROP_CURRENT_NOW:
 580                 ret = bq27x00_battery_current(di, val);
 581                 break;
 582         case POWER_SUPPLY_PROP_CAPACITY:
 583                 ret = bq27x00_simple_value(di->cache.capacity, val);
 584                 break;
 585         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 586                 ret = bq27x00_battery_capacity_level(di, val);
 587                 break;
 588         case POWER_SUPPLY_PROP_TEMP:
 589                 ret = bq27x00_simple_value(di->cache.temperature, val);
 590                 break;
 591         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 592                 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
 593                 break;
 594         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 595                 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
 596                 break;
 597         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 598                 ret = bq27x00_simple_value(di->cache.time_to_full, val);
 599                 break;
 600         case POWER_SUPPLY_PROP_TECHNOLOGY:
 601                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 602                 break;
 603         case POWER_SUPPLY_PROP_CHARGE_NOW:
 604                 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
 605                 break;
 606         case POWER_SUPPLY_PROP_CHARGE_FULL:
 607                 ret = bq27x00_simple_value(di->cache.charge_full, val);
 608                 break;
 609         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 610                 ret = bq27x00_simple_value(di->charge_design_full, val);
 611                 break;
 612         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 613                 ret = bq27x00_simple_value(di->cache.cycle_count, val);
 614                 break;
 615         case POWER_SUPPLY_PROP_ENERGY_NOW:
 616                 ret = bq27x00_simple_value(di->cache.energy, val);
 617                 break;
 618         case POWER_SUPPLY_PROP_POWER_AVG:
 619                 ret = bq27x00_simple_value(di->cache.power_avg, val);
 620                 break;
 621         case POWER_SUPPLY_PROP_HEALTH:
 622                 ret = bq27x00_simple_value(di->cache.health, val);
 623                 break;
 624         default:
 625                 return -EINVAL;
 626         }
 627
 628         return ret;
 629 }
 630
 631 static void bq27x00_external_power_changed(struct power_supply *psy)
 632 {
 633         struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 634
 635         cancel_delayed_work_sync(&di->work);
 636         schedule_delayed_work(&di->work, 0);
 637 }
 638
 639 static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
 640 {
 641         int ret;
 642
 643         di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 644         di->bat.properties = bq27x00_battery_props;
 645         di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
 646         di->bat.get_property = bq27x00_battery_get_property;
 647         di->bat.external_power_changed = bq27x00_external_power_changed;
 648
 649         INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
 650         mutex_init(&di->lock);
 651
 652         ret = power_supply_register(di->dev, &di->bat);
 653         if (ret) {
 654                 dev_err(di->dev, "failed to register battery: %d\n", ret);
 655                 return ret;
 656         }
 657
 658         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 659
 660         bq27x00_update(di);
 661
 662         return 0;
 663 }
 664
 665 static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
 666 {
 667         /*
 668          * power_supply_unregister call bq27x00_battery_get_property which
 669          * call bq27x00_battery_poll.
 670          * Make sure that bq27x00_battery_poll will not call
 671          * schedule_delayed_work again after unregister (which cause OOPS).
 672          */
 673         poll_interval = 0;
 674
 675         cancel_delayed_work_sync(&di->work);
 676
 677         power_supply_unregister(&di->bat);
 678
 679         mutex_destroy(&di->lock);
 680 }
 681
 682
 683 /* i2c specific code */
 684 #ifdef CONFIG_BATTERY_BQ27X00_I2C
 685
 686 /* If the system has several batteries we need a different name for each
 687  * of them...
 688  */
 689 static DEFINE_IDR(battery_id);
 690 static DEFINE_MUTEX(battery_mutex);
 691
 692 static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
 693 {
 694         struct i2c_client *client = to_i2c_client(di->dev);
 695         struct i2c_msg msg[2];
 696         unsigned char data[2];
 697         int ret;
 698
 699         if (!client->adapter)
 700                 return -ENODEV;
 701
 702         msg[0].addr = client->addr;
 703         msg[0].flags = 0;
 704         msg[0].buf = &reg;
 705         msg[0].len = sizeof(reg);
 706         msg[1].addr = client->addr;
 707         msg[1].flags = I2C_M_RD;
 708         msg[1].buf = data;
 709         if (single)
 710                 msg[1].len = 1;
 711         else
 712                 msg[1].len = 2;
 713
 714         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 715         if (ret < 0)
 716                 return ret;
 717
 718         if (!single)
 719                 ret = get_unaligned_le16(data);
 720         else
 721                 ret = data[0];
 722
 723         return ret;
 724 }
 725
 726 static int bq27x00_battery_probe(struct i2c_client *client,
 727                                  const struct i2c_device_id *id)
 728 {
 729         char *name;
 730         struct bq27x00_device_info *di;
 731         int num;
 732         int retval = 0;
 733
 734         /* Get new ID for the new battery device */
 735         retval = idr_pre_get(&battery_id, GFP_KERNEL);
 736         if (retval == 0)
 737                 return -ENOMEM;
 738         mutex_lock(&battery_mutex);
 739         retval = idr_get_new(&battery_id, client, &num);
 740         mutex_unlock(&battery_mutex);
 741         if (retval < 0)
 742                 return retval;
 743
 744         name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
 745         if (!name) {
 746                 dev_err(&client->dev, "failed to allocate device name\n");
 747                 retval = -ENOMEM;
 748                 goto batt_failed_1;
 749         }
 750
 751         di = kzalloc(sizeof(*di), GFP_KERNEL);
 752         if (!di) {
 753                 dev_err(&client->dev, "failed to allocate device info data\n");
 754                 retval = -ENOMEM;
 755                 goto batt_failed_2;
 756         }
 757
 758         di->id = num;
 759         di->dev = &client->dev;
 760         di->chip = id->driver_data;
 761         di->bat.name = name;
 762         di->bus.read = &bq27x00_read_i2c;
 763
 764         if (bq27x00_powersupply_init(di))
 765                 goto batt_failed_3;
 766
 767         i2c_set_clientdata(client, di);
 768
 769         return 0;
 770
 771 batt_failed_3:
 772         kfree(di);
 773 batt_failed_2:
 774         kfree(name);
 775 batt_failed_1:
 776         mutex_lock(&battery_mutex);
 777         idr_remove(&battery_id, num);
 778         mutex_unlock(&battery_mutex);
 779
 780         return retval;
 781 }
 782
 783 static int bq27x00_battery_remove(struct i2c_client *client)
 784 {
 785         struct bq27x00_device_info *di = i2c_get_clientdata(client);
 786
 787         bq27x00_powersupply_unregister(di);
 788
 789         kfree(di->bat.name);
 790
 791         mutex_lock(&battery_mutex);
 792         idr_remove(&battery_id, di->id);
 793         mutex_unlock(&battery_mutex);
 794
 795         kfree(di);
 796
 797         return 0;
 798 }
 799
 800 static const struct i2c_device_id bq27x00_id[] = {
 801         { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
 802         { "bq27500", BQ27500 },
 803         {},
 804 };
 805 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
 806
 807 static struct i2c_driver bq27x00_battery_driver = {
 808         .driver = {
 809                 .name = "bq27x00-battery",
 810         },
 811         .probe = bq27x00_battery_probe,
 812         .remove = bq27x00_battery_remove,
 813         .id_table = bq27x00_id,
 814 };
 815
 816 static inline int bq27x00_battery_i2c_init(void)
 817 {
 818         int ret = i2c_add_driver(&bq27x00_battery_driver);
 819         if (ret)
 820                 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
 821
 822         return ret;
 823 }
 824
 825 static inline void bq27x00_battery_i2c_exit(void)
 826 {
 827         i2c_del_driver(&bq27x00_battery_driver);
 828 }
 829
 830 #else
 831
 832 static inline int bq27x00_battery_i2c_init(void) { return 0; }
 833 static inline void bq27x00_battery_i2c_exit(void) {};
 834
 835 #endif
 836
 837 /* platform specific code */
 838 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
 839
 840 static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
 841                         bool single)
 842 {
 843         struct device *dev = di->dev;
 844         struct bq27000_platform_data *pdata = dev->platform_data;
 845         unsigned int timeout = 3;
 846         int upper, lower;
 847         int temp;
 848
 849         if (!single) {
 850                 /* Make sure the value has not changed in between reading the
 851                  * lower and the upper part */
 852                 upper = pdata->read(dev, reg + 1);
 853                 do {
 854                         temp = upper;
 855                         if (upper < 0)
 856                                 return upper;
 857
 858                         lower = pdata->read(dev, reg);
 859                         if (lower < 0)
 860                                 return lower;
 861
 862                         upper = pdata->read(dev, reg + 1);
 863                 } while (temp != upper && --timeout);
 864
 865                 if (timeout == 0)
 866                         return -EIO;
 867
 868                 return (upper << 8) | lower;
 869         }
 870
 871         return pdata->read(dev, reg);
 872 }
 873
 874 static int __devinit bq27000_battery_probe(struct platform_device *pdev)
 875 {
 876         struct bq27x00_device_info *di;
 877         struct bq27000_platform_data *pdata = pdev->dev.platform_data;
 878         int ret;
 879
 880         if (!pdata) {
 881                 dev_err(&pdev->dev, "no platform_data supplied\n");
 882                 return -EINVAL;
 883         }
 884
 885         if (!pdata->read) {
 886                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
 887                 return -EINVAL;
 888         }
 889
 890         di = kzalloc(sizeof(*di), GFP_KERNEL);
 891         if (!di) {
 892                 dev_err(&pdev->dev, "failed to allocate device info data\n");
 893                 return -ENOMEM;
 894         }
 895
 896         platform_set_drvdata(pdev, di);
 897
 898         di->dev = &pdev->dev;
 899         di->chip = BQ27000;
 900
 901         di->bat.name = pdata->name ?: dev_name(&pdev->dev);
 902         di->bus.read = &bq27000_read_platform;
 903
 904         ret = bq27x00_powersupply_init(di);
 905         if (ret)
 906                 goto err_free;
 907
 908         return 0;
 909
 910 err_free:
 911         platform_set_drvdata(pdev, NULL);
 912         kfree(di);
 913
 914         return ret;
 915 }
 916
 917 static int __devexit bq27000_battery_remove(struct platform_device *pdev)
 918 {
 919         struct bq27x00_device_info *di = platform_get_drvdata(pdev);
 920
 921         bq27x00_powersupply_unregister(di);
 922
 923         platform_set_drvdata(pdev, NULL);
 924         kfree(di);
 925
 926         return 0;
 927 }
 928
 929 static struct platform_driver bq27000_battery_driver = {
 930         .probe  = bq27000_battery_probe,
 931         .remove = __devexit_p(bq27000_battery_remove),
 932         .driver = {
 933                 .name = "bq27000-battery",
 934                 .owner = THIS_MODULE,
 935         },
 936 };
 937
 938 static inline int bq27x00_battery_platform_init(void)
 939 {
 940         int ret = platform_driver_register(&bq27000_battery_driver);
 941         if (ret)
 942                 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
 943
 944         return ret;
 945 }
 946
 947 static inline void bq27x00_battery_platform_exit(void)
 948 {
 949         platform_driver_unregister(&bq27000_battery_driver);
 950 }
 951
 952 #else
 953
 954 static inline int bq27x00_battery_platform_init(void) { return 0; }
 955 static inline void bq27x00_battery_platform_exit(void) {};
 956
 957 #endif
 958
 959 /*
 960  * Module stuff
 961  */
 962
 963 static int __init bq27x00_battery_init(void)
 964 {
 965         int ret;
 966
 967         ret = bq27x00_battery_i2c_init();
 968         if (ret)
 969                 return ret;
 970
 971         ret = bq27x00_battery_platform_init();
 972         if (ret)
 973                 bq27x00_battery_i2c_exit();
 974
 975         return ret;
 976 }
 977 module_init(bq27x00_battery_init);
 978
 979 static void __exit bq27x00_battery_exit(void)
 980 {
 981         bq27x00_battery_platform_exit();
 982         bq27x00_battery_i2c_exit();
 983 }
 984 module_exit(bq27x00_battery_exit);
 985
 986 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
 987 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
 988 MODULE_LICENSE("GPL");