Pileus Git - ~andy/linux/blob - 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         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  */
 248 static 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  */
 257 static 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  */
 283 static 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  */
 305 static 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  */
 327 static 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  */
 342 static 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  */
 363 static 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  */
 384 static 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
 413 static 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
 468 static 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  */
 487 static 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
 515 static 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
 543 static 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  */
 577 static 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
 593 static 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
 607 static 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
 686 static 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
 694 static 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
 726 static 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  */
 750 static DEFINE_IDR(battery_id);
 751 static DEFINE_MUTEX(battery_mutex);
 752
 753 static 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
 787 static 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
 833 batt_failed_3:
 834         kfree(di);
 835 batt_failed_2:
 836         kfree(name);
 837 batt_failed_1:
 838         mutex_lock(&battery_mutex);
 839         idr_remove(&battery_id, num);
 840         mutex_unlock(&battery_mutex);
 841
 842         return retval;
 843 }
 844
 845 static 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
 862 static 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 };
 868 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
 869
 870 static 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
 879 static 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
 888 static inline void bq27x00_battery_i2c_exit(void)
 889 {
 890         i2c_del_driver(&bq27x00_battery_driver);
 891 }
 892
 893 #else
 894
 895 static inline int bq27x00_battery_i2c_init(void) { return 0; }
 896 static inline void bq27x00_battery_i2c_exit(void) {};
 897
 898 #endif
 899
 900 /* platform specific code */
 901 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
 902
 903 static 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
 937 static 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
 973 err_free:
 974         platform_set_drvdata(pdev, NULL);
 975         kfree(di);
 976
 977         return ret;
 978 }
 979
 980 static 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
 992 static 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
1001 static 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
1010 static inline void bq27x00_battery_platform_exit(void)
1011 {
1012         platform_driver_unregister(&bq27000_battery_driver);
1013 }
1014
1015 #else
1016
1017 static inline int bq27x00_battery_platform_init(void) { return 0; }
1018 static inline void bq27x00_battery_platform_exit(void) {};
1019
1020 #endif
1021
1022 /*
1023  * Module stuff
1024  */
1025
1026 static 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 }
1040 module_init(bq27x00_battery_init);
1041
1042 static void __exit bq27x00_battery_exit(void)
1043 {
1044         bq27x00_battery_platform_exit();
1045         bq27x00_battery_i2c_exit();
1046 }
1047 module_exit(bq27x00_battery_exit);
1048
1049 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1050 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1051 MODULE_LICENSE("GPL");