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