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  * 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
  80 struct bq27x00_device_info;
  81 struct bq27x00_access_methods {
  82         int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
  83 };
  84
  85 enum bq27x00_chip { BQ27000, BQ27500, BQ27425};
  86
  87 struct 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
 101 struct 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
 119 static 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
 140 static 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
 154 static unsigned int poll_interval = 360;
 155 module_param(poll_interval, uint, 0644);
 156 MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
 157                                 "0 disables polling");
 158
 159 /*
 160  * Common code for BQ27x00 devices
 161  */
 162
 163 static 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  */
 176 static 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  */
 187 static 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  */
 208 static 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  */
 231 static 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  */
 240 static 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  */
 249 static 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  */
 275 static 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  */
 297 static 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  */
 319 static 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  */
 334 static 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  */
 355 static 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  */
 376 static 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
 405 static 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
 460 static 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  */
 479 static 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
 507 static 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
 535 static 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  */
 569 static 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
 585 static 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
 599 static 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
 678 static 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
 686 static 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
 718 static 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  */
 742 static DEFINE_IDR(battery_id);
 743 static DEFINE_MUTEX(battery_mutex);
 744
 745 static 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
 779 static 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         if (bq27x00_powersupply_init(di))
 818                 goto batt_failed_3;
 819
 820         i2c_set_clientdata(client, di);
 821
 822         return 0;
 823
 824 batt_failed_3:
 825         kfree(di);
 826 batt_failed_2:
 827         kfree(name);
 828 batt_failed_1:
 829         mutex_lock(&battery_mutex);
 830         idr_remove(&battery_id, num);
 831         mutex_unlock(&battery_mutex);
 832
 833         return retval;
 834 }
 835
 836 static int bq27x00_battery_remove(struct i2c_client *client)
 837 {
 838         struct bq27x00_device_info *di = i2c_get_clientdata(client);
 839
 840         bq27x00_powersupply_unregister(di);
 841
 842         kfree(di->bat.name);
 843
 844         mutex_lock(&battery_mutex);
 845         idr_remove(&battery_id, di->id);
 846         mutex_unlock(&battery_mutex);
 847
 848         kfree(di);
 849
 850         return 0;
 851 }
 852
 853 static const struct i2c_device_id bq27x00_id[] = {
 854         { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
 855         { "bq27500", BQ27500 },
 856         { "bq27425", BQ27425 },
 857         {},
 858 };
 859 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
 860
 861 static struct i2c_driver bq27x00_battery_driver = {
 862         .driver = {
 863                 .name = "bq27x00-battery",
 864         },
 865         .probe = bq27x00_battery_probe,
 866         .remove = bq27x00_battery_remove,
 867         .id_table = bq27x00_id,
 868 };
 869
 870 static inline int bq27x00_battery_i2c_init(void)
 871 {
 872         int ret = i2c_add_driver(&bq27x00_battery_driver);
 873         if (ret)
 874                 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
 875
 876         return ret;
 877 }
 878
 879 static inline void bq27x00_battery_i2c_exit(void)
 880 {
 881         i2c_del_driver(&bq27x00_battery_driver);
 882 }
 883
 884 #else
 885
 886 static inline int bq27x00_battery_i2c_init(void) { return 0; }
 887 static inline void bq27x00_battery_i2c_exit(void) {};
 888
 889 #endif
 890
 891 /* platform specific code */
 892 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
 893
 894 static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
 895                         bool single)
 896 {
 897         struct device *dev = di->dev;
 898         struct bq27000_platform_data *pdata = dev->platform_data;
 899         unsigned int timeout = 3;
 900         int upper, lower;
 901         int temp;
 902
 903         if (!single) {
 904                 /* Make sure the value has not changed in between reading the
 905                  * lower and the upper part */
 906                 upper = pdata->read(dev, reg + 1);
 907                 do {
 908                         temp = upper;
 909                         if (upper < 0)
 910                                 return upper;
 911
 912                         lower = pdata->read(dev, reg);
 913                         if (lower < 0)
 914                                 return lower;
 915
 916                         upper = pdata->read(dev, reg + 1);
 917                 } while (temp != upper && --timeout);
 918
 919                 if (timeout == 0)
 920                         return -EIO;
 921
 922                 return (upper << 8) | lower;
 923         }
 924
 925         return pdata->read(dev, reg);
 926 }
 927
 928 static int __devinit bq27000_battery_probe(struct platform_device *pdev)
 929 {
 930         struct bq27x00_device_info *di;
 931         struct bq27000_platform_data *pdata = pdev->dev.platform_data;
 932         int ret;
 933
 934         if (!pdata) {
 935                 dev_err(&pdev->dev, "no platform_data supplied\n");
 936                 return -EINVAL;
 937         }
 938
 939         if (!pdata->read) {
 940                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
 941                 return -EINVAL;
 942         }
 943
 944         di = kzalloc(sizeof(*di), GFP_KERNEL);
 945         if (!di) {
 946                 dev_err(&pdev->dev, "failed to allocate device info data\n");
 947                 return -ENOMEM;
 948         }
 949
 950         platform_set_drvdata(pdev, di);
 951
 952         di->dev = &pdev->dev;
 953         di->chip = BQ27000;
 954
 955         di->bat.name = pdata->name ?: dev_name(&pdev->dev);
 956         di->bus.read = &bq27000_read_platform;
 957
 958         ret = bq27x00_powersupply_init(di);
 959         if (ret)
 960                 goto err_free;
 961
 962         return 0;
 963
 964 err_free:
 965         platform_set_drvdata(pdev, NULL);
 966         kfree(di);
 967
 968         return ret;
 969 }
 970
 971 static int __devexit bq27000_battery_remove(struct platform_device *pdev)
 972 {
 973         struct bq27x00_device_info *di = platform_get_drvdata(pdev);
 974
 975         bq27x00_powersupply_unregister(di);
 976
 977         platform_set_drvdata(pdev, NULL);
 978         kfree(di);
 979
 980         return 0;
 981 }
 982
 983 static struct platform_driver bq27000_battery_driver = {
 984         .probe  = bq27000_battery_probe,
 985         .remove = __devexit_p(bq27000_battery_remove),
 986         .driver = {
 987                 .name = "bq27000-battery",
 988                 .owner = THIS_MODULE,
 989         },
 990 };
 991
 992 static inline int bq27x00_battery_platform_init(void)
 993 {
 994         int ret = platform_driver_register(&bq27000_battery_driver);
 995         if (ret)
 996                 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
 997
 998         return ret;
 999 }
1000
1001 static inline void bq27x00_battery_platform_exit(void)
1002 {
1003         platform_driver_unregister(&bq27000_battery_driver);
1004 }
1005
1006 #else
1007
1008 static inline int bq27x00_battery_platform_init(void) { return 0; }
1009 static inline void bq27x00_battery_platform_exit(void) {};
1010
1011 #endif
1012
1013 /*
1014  * Module stuff
1015  */
1016
1017 static int __init bq27x00_battery_init(void)
1018 {
1019         int ret;
1020
1021         ret = bq27x00_battery_i2c_init();
1022         if (ret)
1023                 return ret;
1024
1025         ret = bq27x00_battery_platform_init();
1026         if (ret)
1027                 bq27x00_battery_i2c_exit();
1028
1029         return ret;
1030 }
1031 module_init(bq27x00_battery_init);
1032
1033 static void __exit bq27x00_battery_exit(void)
1034 {
1035         bq27x00_battery_platform_exit();
1036         bq27x00_battery_i2c_exit();
1037 }
1038 module_exit(bq27x00_battery_exit);
1039
1040 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1041 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1042 MODULE_LICENSE("GPL");