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/device.h>
  29 #include <linux/module.h>
  30 #include <linux/param.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/workqueue.h>
  33 #include <linux/delay.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/power_supply.h>
  36 #include <linux/idr.h>
  37 #include <linux/i2c.h>
  38 #include <linux/slab.h>
  39 #include <asm/unaligned.h>
  40
  41 #include <linux/power/bq27x00_battery.h>
  42
  43 #define DRIVER_VERSION                  "1.2.0"
  44
  45 #define BQ27x00_REG_TEMP                0x06
  46 #define BQ27x00_REG_VOLT                0x08
  47 #define BQ27x00_REG_AI                  0x14
  48 #define BQ27x00_REG_FLAGS               0x0A
  49 #define BQ27x00_REG_TTE                 0x16
  50 #define BQ27x00_REG_TTF                 0x18
  51 #define BQ27x00_REG_TTECP               0x26
  52 #define BQ27x00_REG_NAC                 0x0C /* Nominal available capacity */
  53 #define BQ27x00_REG_LMD                 0x12 /* Last measured discharge */
  54 #define BQ27x00_REG_CYCT                0x2A /* Cycle count total */
  55 #define BQ27x00_REG_AE                  0x22 /* Available energy */
  56 #define BQ27x00_POWER_AVG               0x24
  57
  58 #define BQ27000_REG_RSOC                0x0B /* Relative State-of-Charge */
  59 #define BQ27000_REG_ILMD                0x76 /* Initial last measured discharge */
  60 #define BQ27000_FLAG_EDVF               BIT(0) /* Final End-of-Discharge-Voltage flag */
  61 #define BQ27000_FLAG_EDV1               BIT(1) /* First End-of-Discharge-Voltage flag */
  62 #define BQ27000_FLAG_CI                 BIT(4) /* Capacity Inaccurate flag */
  63 #define BQ27000_FLAG_FC                 BIT(5)
  64 #define BQ27000_FLAG_CHGS               BIT(7) /* Charge state flag */
  65
  66 #define BQ27500_REG_SOC                 0x2C
  67 #define BQ27500_REG_DCAP                0x3C /* Design capacity */
  68 #define BQ27500_FLAG_DSC                BIT(0)
  69 #define BQ27500_FLAG_SOCF               BIT(1) /* State-of-Charge threshold final */
  70 #define BQ27500_FLAG_SOC1               BIT(2) /* State-of-Charge threshold 1 */
  71 #define BQ27500_FLAG_FC                 BIT(9)
  72 #define BQ27500_FLAG_OTC                BIT(15)
  73
  74 /* bq27425 register addresses are same as bq27x00 addresses minus 4 */
  75 #define BQ27425_REG_OFFSET              0x04
  76 #define BQ27425_REG_SOC                 0x18 /* Register address plus offset */
  77
  78 #define BQ27000_RS                      20 /* Resistor sense */
  79 #define BQ27x00_POWER_CONSTANT          (256 * 29200 / 1000)
  80
  81 struct bq27x00_device_info;
  82 struct bq27x00_access_methods {
  83         int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
  84 };
  85
  86 enum bq27x00_chip { BQ27000, BQ27500, BQ27425};
  87
  88 struct bq27x00_reg_cache {
  89         int temperature;
  90         int time_to_empty;
  91         int time_to_empty_avg;
  92         int time_to_full;
  93         int charge_full;
  94         int cycle_count;
  95         int capacity;
  96         int energy;
  97         int flags;
  98         int power_avg;
  99         int health;
 100 };
 101
 102 struct bq27x00_device_info {
 103         struct device           *dev;
 104         int                     id;
 105         enum bq27x00_chip       chip;
 106
 107         struct bq27x00_reg_cache cache;
 108         int charge_design_full;
 109
 110         unsigned long last_update;
 111         struct delayed_work work;
 112
 113         struct power_supply     bat;
 114
 115         struct bq27x00_access_methods bus;
 116
 117         struct mutex lock;
 118 };
 119
 120 static enum power_supply_property bq27x00_battery_props[] = {
 121         POWER_SUPPLY_PROP_STATUS,
 122         POWER_SUPPLY_PROP_PRESENT,
 123         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 124         POWER_SUPPLY_PROP_CURRENT_NOW,
 125         POWER_SUPPLY_PROP_CAPACITY,
 126         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 127         POWER_SUPPLY_PROP_TEMP,
 128         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 129         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 130         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 131         POWER_SUPPLY_PROP_TECHNOLOGY,
 132         POWER_SUPPLY_PROP_CHARGE_FULL,
 133         POWER_SUPPLY_PROP_CHARGE_NOW,
 134         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 135         POWER_SUPPLY_PROP_CYCLE_COUNT,
 136         POWER_SUPPLY_PROP_ENERGY_NOW,
 137         POWER_SUPPLY_PROP_POWER_AVG,
 138         POWER_SUPPLY_PROP_HEALTH,
 139 };
 140
 141 static enum power_supply_property bq27425_battery_props[] = {
 142         POWER_SUPPLY_PROP_STATUS,
 143         POWER_SUPPLY_PROP_PRESENT,
 144         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 145         POWER_SUPPLY_PROP_CURRENT_NOW,
 146         POWER_SUPPLY_PROP_CAPACITY,
 147         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 148         POWER_SUPPLY_PROP_TEMP,
 149         POWER_SUPPLY_PROP_TECHNOLOGY,
 150         POWER_SUPPLY_PROP_CHARGE_FULL,
 151         POWER_SUPPLY_PROP_CHARGE_NOW,
 152         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 153 };
 154
 155 static unsigned int poll_interval = 360;
 156 module_param(poll_interval, uint, 0644);
 157 MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
 158                                 "0 disables polling");
 159
 160 /*
 161  * Common code for BQ27x00 devices
 162  */
 163
 164 static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
 165                 bool single)
 166 {
 167         if (di->chip == BQ27425)
 168                 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
 169         return di->bus.read(di, reg, single);
 170 }
 171
 172 /*
 173  * Higher versions of the chip like BQ27425 and BQ27500
 174  * differ from BQ27000 and BQ27200 in calculation of certain
 175  * parameters. Hence we need to check for the chip type.
 176  */
 177 static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
 178 {
 179         if (di->chip == BQ27425 || di->chip == BQ27500)
 180                 return true;
 181         return false;
 182 }
 183
 184 /*
 185  * Return the battery Relative State-of-Charge
 186  * Or < 0 if something fails.
 187  */
 188 static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
 189 {
 190         int rsoc;
 191
 192         if (di->chip == BQ27500)
 193                 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
 194         else if (di->chip == BQ27425)
 195                 rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
 196         else
 197                 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
 198
 199         if (rsoc < 0)
 200                 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
 201
 202         return rsoc;
 203 }
 204
 205 /*
 206  * Return a battery charge value in µAh
 207  * Or < 0 if something fails.
 208  */
 209 static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
 210 {
 211         int charge;
 212
 213         charge = bq27x00_read(di, reg, false);
 214         if (charge < 0) {
 215                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 216                         reg, charge);
 217                 return charge;
 218         }
 219
 220         if (bq27xxx_is_chip_version_higher(di))
 221                 charge *= 1000;
 222         else
 223                 charge = charge * 3570 / BQ27000_RS;
 224
 225         return charge;
 226 }
 227
 228 /*
 229  * Return the battery Nominal available capaciy in µAh
 230  * Or < 0 if something fails.
 231  */
 232 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
 233 {
 234         int flags;
 235         bool is_bq27500 = di->chip == BQ27500;
 236         bool is_higher = bq27xxx_is_chip_version_higher(di);
 237
 238         flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
 239         if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
 240                 return -ENODATA;
 241
 242         return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
 243 }
 244
 245 /*
 246  * Return the battery Last measured discharge in µAh
 247  * Or < 0 if something fails.
 248  */
 249 static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
 250 {
 251         return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
 252 }
 253
 254 /*
 255  * Return the battery Initial last measured discharge in µAh
 256  * Or < 0 if something fails.
 257  */
 258 static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
 259 {
 260         int ilmd;
 261
 262         if (bq27xxx_is_chip_version_higher(di))
 263                 ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
 264         else
 265                 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
 266
 267         if (ilmd < 0) {
 268                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 269                 return ilmd;
 270         }
 271
 272         if (bq27xxx_is_chip_version_higher(di))
 273                 ilmd *= 1000;
 274         else
 275                 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
 276
 277         return ilmd;
 278 }
 279
 280 /*
 281  * Return the battery Available energy in µWh
 282  * Or < 0 if something fails.
 283  */
 284 static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
 285 {
 286         int ae;
 287
 288         ae = bq27x00_read(di, BQ27x00_REG_AE, false);
 289         if (ae < 0) {
 290                 dev_dbg(di->dev, "error reading available energy\n");
 291                 return ae;
 292         }
 293
 294         if (di->chip == BQ27500)
 295                 ae *= 1000;
 296         else
 297                 ae = ae * 29200 / BQ27000_RS;
 298
 299         return ae;
 300 }
 301
 302 /*
 303  * Return the battery temperature in tenths of degree Kelvin
 304  * Or < 0 if something fails.
 305  */
 306 static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
 307 {
 308         int temp;
 309
 310         temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
 311         if (temp < 0) {
 312                 dev_err(di->dev, "error reading temperature\n");
 313                 return temp;
 314         }
 315
 316         if (!bq27xxx_is_chip_version_higher(di))
 317                 temp = 5 * temp / 2;
 318
 319         return temp;
 320 }
 321
 322 /*
 323  * Return the battery Cycle count total
 324  * Or < 0 if something fails.
 325  */
 326 static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
 327 {
 328         int cyct;
 329
 330         cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
 331         if (cyct < 0)
 332                 dev_err(di->dev, "error reading cycle count total\n");
 333
 334         return cyct;
 335 }
 336
 337 /*
 338  * Read a time register.
 339  * Return < 0 if something fails.
 340  */
 341 static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
 342 {
 343         int tval;
 344
 345         tval = bq27x00_read(di, reg, false);
 346         if (tval < 0) {
 347                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 348                         reg, tval);
 349                 return tval;
 350         }
 351
 352         if (tval == 65535)
 353                 return -ENODATA;
 354
 355         return tval * 60;
 356 }
 357
 358 /*
 359  * Read a power avg register.
 360  * Return < 0 if something fails.
 361  */
 362 static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
 363 {
 364         int tval;
 365
 366         tval = bq27x00_read(di, reg, false);
 367         if (tval < 0) {
 368                 dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
 369                         reg, tval);
 370                 return tval;
 371         }
 372
 373         if (di->chip == BQ27500)
 374                 return tval;
 375         else
 376                 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
 377 }
 378
 379 /*
 380  * Read flag register.
 381  * Return < 0 if something fails.
 382  */
 383 static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
 384 {
 385         int tval;
 386
 387         tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 388         if (tval < 0) {
 389                 dev_err(di->dev, "error reading flag register:%d\n", tval);
 390                 return tval;
 391         }
 392
 393         if ((di->chip == BQ27500)) {
 394                 if (tval & BQ27500_FLAG_SOCF)
 395                         tval = POWER_SUPPLY_HEALTH_DEAD;
 396                 else if (tval & BQ27500_FLAG_OTC)
 397                         tval = POWER_SUPPLY_HEALTH_OVERHEAT;
 398                 else
 399                         tval = POWER_SUPPLY_HEALTH_GOOD;
 400                 return tval;
 401         } else {
 402                 if (tval & BQ27000_FLAG_EDV1)
 403                         tval = POWER_SUPPLY_HEALTH_DEAD;
 404                 else
 405                         tval = POWER_SUPPLY_HEALTH_GOOD;
 406                 return tval;
 407         }
 408
 409         return -1;
 410 }
 411
 412 static void bq27x00_update(struct bq27x00_device_info *di)
 413 {
 414         struct bq27x00_reg_cache cache = {0, };
 415         bool is_bq27500 = di->chip == BQ27500;
 416         bool is_bq27425 = di->chip == BQ27425;
 417
 418         cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
 419         if ((cache.flags & 0xff) == 0xff)
 420                 /* read error */
 421                 cache.flags = -1;
 422         if (cache.flags >= 0) {
 423                 if (!is_bq27500 && !is_bq27425
 424                                 && (cache.flags & BQ27000_FLAG_CI)) {
 425                         dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
 426                         cache.capacity = -ENODATA;
 427                         cache.energy = -ENODATA;
 428                         cache.time_to_empty = -ENODATA;
 429                         cache.time_to_empty_avg = -ENODATA;
 430                         cache.time_to_full = -ENODATA;
 431                         cache.charge_full = -ENODATA;
 432                         cache.health = -ENODATA;
 433                 } else {
 434                         cache.capacity = bq27x00_battery_read_rsoc(di);
 435                         if (!is_bq27425) {
 436                                 cache.energy = bq27x00_battery_read_energy(di);
 437                                 cache.time_to_empty =
 438                                         bq27x00_battery_read_time(di,
 439                                                         BQ27x00_REG_TTE);
 440                                 cache.time_to_empty_avg =
 441                                         bq27x00_battery_read_time(di,
 442                                                         BQ27x00_REG_TTECP);
 443                                 cache.time_to_full =
 444                                         bq27x00_battery_read_time(di,
 445                                                         BQ27x00_REG_TTF);
 446                         }
 447                         cache.charge_full = bq27x00_battery_read_lmd(di);
 448                         cache.health = bq27x00_battery_read_health(di);
 449                 }
 450                 cache.temperature = bq27x00_battery_read_temperature(di);
 451                 if (!is_bq27425)
 452                         cache.cycle_count = bq27x00_battery_read_cyct(di);
 453                 cache.power_avg =
 454                         bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
 455
 456                 /* We only have to read charge design full once */
 457                 if (di->charge_design_full <= 0)
 458                         di->charge_design_full = bq27x00_battery_read_ilmd(di);
 459         }
 460
 461         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
 462                 di->cache = cache;
 463                 power_supply_changed(&di->bat);
 464         }
 465
 466         di->last_update = jiffies;
 467 }
 468
 469 static void bq27x00_battery_poll(struct work_struct *work)
 470 {
 471         struct bq27x00_device_info *di =
 472                 container_of(work, struct bq27x00_device_info, work.work);
 473
 474         bq27x00_update(di);
 475
 476         if (poll_interval > 0) {
 477                 /* The timer does not have to be accurate. */
 478                 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
 479                 schedule_delayed_work(&di->work, poll_interval * HZ);
 480         }
 481 }
 482
 483 /*
 484  * Return the battery average current in µA
 485  * Note that current can be negative signed as well
 486  * Or 0 if something fails.
 487  */
 488 static int bq27x00_battery_current(struct bq27x00_device_info *di,
 489         union power_supply_propval *val)
 490 {
 491         int curr;
 492         int flags;
 493
 494         curr = bq27x00_read(di, BQ27x00_REG_AI, false);
 495         if (curr < 0) {
 496                 dev_err(di->dev, "error reading current\n");
 497                 return curr;
 498         }
 499
 500         if (bq27xxx_is_chip_version_higher(di)) {
 501                 /* bq27500 returns signed value */
 502                 val->intval = (int)((s16)curr) * 1000;
 503         } else {
 504                 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 505                 if (flags & BQ27000_FLAG_CHGS) {
 506                         dev_dbg(di->dev, "negative current!\n");
 507                         curr = -curr;
 508                 }
 509
 510                 val->intval = curr * 3570 / BQ27000_RS;
 511         }
 512
 513         return 0;
 514 }
 515
 516 static int bq27x00_battery_status(struct bq27x00_device_info *di,
 517         union power_supply_propval *val)
 518 {
 519         int status;
 520
 521         if (bq27xxx_is_chip_version_higher(di)) {
 522                 if (di->cache.flags & BQ27500_FLAG_FC)
 523                         status = POWER_SUPPLY_STATUS_FULL;
 524                 else if (di->cache.flags & BQ27500_FLAG_DSC)
 525                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 526                 else
 527                         status = POWER_SUPPLY_STATUS_CHARGING;
 528         } else {
 529                 if (di->cache.flags & BQ27000_FLAG_FC)
 530                         status = POWER_SUPPLY_STATUS_FULL;
 531                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 532                         status = POWER_SUPPLY_STATUS_CHARGING;
 533                 else if (power_supply_am_i_supplied(&di->bat))
 534                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 535                 else
 536                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 537         }
 538
 539         val->intval = status;
 540
 541         return 0;
 542 }
 543
 544 static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
 545         union power_supply_propval *val)
 546 {
 547         int level;
 548
 549         if (bq27xxx_is_chip_version_higher(di)) {
 550                 if (di->cache.flags & BQ27500_FLAG_FC)
 551                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 552                 else if (di->cache.flags & BQ27500_FLAG_SOC1)
 553                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 554                 else if (di->cache.flags & BQ27500_FLAG_SOCF)
 555                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 556                 else
 557                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 558         } else {
 559                 if (di->cache.flags & BQ27000_FLAG_FC)
 560                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 561                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 562                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 563                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 564                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 565                 else
 566                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 567         }
 568
 569         val->intval = level;
 570
 571         return 0;
 572 }
 573
 574 /*
 575  * Return the battery Voltage in millivolts
 576  * Or < 0 if something fails.
 577  */
 578 static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
 579         union power_supply_propval *val)
 580 {
 581         int volt;
 582
 583         volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
 584         if (volt < 0) {
 585                 dev_err(di->dev, "error reading voltage\n");
 586                 return volt;
 587         }
 588
 589         val->intval = volt * 1000;
 590
 591         return 0;
 592 }
 593
 594 static int bq27x00_simple_value(int value,
 595         union power_supply_propval *val)
 596 {
 597         if (value < 0)
 598                 return value;
 599
 600         val->intval = value;
 601
 602         return 0;
 603 }
 604
 605 #define to_bq27x00_device_info(x) container_of((x), \
 606                                 struct bq27x00_device_info, bat);
 607
 608 static int bq27x00_battery_get_property(struct power_supply *psy,
 609                                         enum power_supply_property psp,
 610                                         union power_supply_propval *val)
 611 {
 612         int ret = 0;
 613         struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 614
 615         mutex_lock(&di->lock);
 616         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 617                 cancel_delayed_work_sync(&di->work);
 618                 bq27x00_battery_poll(&di->work.work);
 619         }
 620         mutex_unlock(&di->lock);
 621
 622         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 623                 return -ENODEV;
 624
 625         switch (psp) {
 626         case POWER_SUPPLY_PROP_STATUS:
 627                 ret = bq27x00_battery_status(di, val);
 628                 break;
 629         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 630                 ret = bq27x00_battery_voltage(di, val);
 631                 break;
 632         case POWER_SUPPLY_PROP_PRESENT:
 633                 val->intval = di->cache.flags < 0 ? 0 : 1;
 634                 break;
 635         case POWER_SUPPLY_PROP_CURRENT_NOW:
 636                 ret = bq27x00_battery_current(di, val);
 637                 break;
 638         case POWER_SUPPLY_PROP_CAPACITY:
 639                 ret = bq27x00_simple_value(di->cache.capacity, val);
 640                 break;
 641         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 642                 ret = bq27x00_battery_capacity_level(di, val);
 643                 break;
 644         case POWER_SUPPLY_PROP_TEMP:
 645                 ret = bq27x00_simple_value(di->cache.temperature, val);
 646                 if (ret == 0)
 647                         val->intval -= 2731;
 648                 break;
 649         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 650                 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
 651                 break;
 652         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 653                 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
 654                 break;
 655         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 656                 ret = bq27x00_simple_value(di->cache.time_to_full, val);
 657                 break;
 658         case POWER_SUPPLY_PROP_TECHNOLOGY:
 659                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 660                 break;
 661         case POWER_SUPPLY_PROP_CHARGE_NOW:
 662                 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
 663                 break;
 664         case POWER_SUPPLY_PROP_CHARGE_FULL:
 665                 ret = bq27x00_simple_value(di->cache.charge_full, val);
 666                 break;
 667         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 668                 ret = bq27x00_simple_value(di->charge_design_full, val);
 669                 break;
 670         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 671                 ret = bq27x00_simple_value(di->cache.cycle_count, val);
 672                 break;
 673         case POWER_SUPPLY_PROP_ENERGY_NOW:
 674                 ret = bq27x00_simple_value(di->cache.energy, val);
 675                 break;
 676         case POWER_SUPPLY_PROP_POWER_AVG:
 677                 ret = bq27x00_simple_value(di->cache.power_avg, val);
 678                 break;
 679         case POWER_SUPPLY_PROP_HEALTH:
 680                 ret = bq27x00_simple_value(di->cache.health, val);
 681                 break;
 682         default:
 683                 return -EINVAL;
 684         }
 685
 686         return ret;
 687 }
 688
 689 static void bq27x00_external_power_changed(struct power_supply *psy)
 690 {
 691         struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 692
 693         cancel_delayed_work_sync(&di->work);
 694         schedule_delayed_work(&di->work, 0);
 695 }
 696
 697 static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
 698 {
 699         int ret;
 700
 701         di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 702         if (di->chip == BQ27425) {
 703                 di->bat.properties = bq27425_battery_props;
 704                 di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
 705         } else {
 706                 di->bat.properties = bq27x00_battery_props;
 707                 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
 708         }
 709         di->bat.get_property = bq27x00_battery_get_property;
 710         di->bat.external_power_changed = bq27x00_external_power_changed;
 711
 712         INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
 713         mutex_init(&di->lock);
 714
 715         ret = power_supply_register(di->dev, &di->bat);
 716         if (ret) {
 717                 dev_err(di->dev, "failed to register battery: %d\n", ret);
 718                 return ret;
 719         }
 720
 721         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 722
 723         bq27x00_update(di);
 724
 725         return 0;
 726 }
 727
 728 static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
 729 {
 730         /*
 731          * power_supply_unregister call bq27x00_battery_get_property which
 732          * call bq27x00_battery_poll.
 733          * Make sure that bq27x00_battery_poll will not call
 734          * schedule_delayed_work again after unregister (which cause OOPS).
 735          */
 736         poll_interval = 0;
 737
 738         cancel_delayed_work_sync(&di->work);
 739
 740         power_supply_unregister(&di->bat);
 741
 742         mutex_destroy(&di->lock);
 743 }
 744
 745
 746 /* i2c specific code */
 747 #ifdef CONFIG_BATTERY_BQ27X00_I2C
 748
 749 /* If the system has several batteries we need a different name for each
 750  * of them...
 751  */
 752 static DEFINE_IDR(battery_id);
 753 static DEFINE_MUTEX(battery_mutex);
 754
 755 static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
 756 {
 757         struct i2c_client *client = to_i2c_client(di->dev);
 758         struct i2c_msg msg[2];
 759         unsigned char data[2];
 760         int ret;
 761
 762         if (!client->adapter)
 763                 return -ENODEV;
 764
 765         msg[0].addr = client->addr;
 766         msg[0].flags = 0;
 767         msg[0].buf = &reg;
 768         msg[0].len = sizeof(reg);
 769         msg[1].addr = client->addr;
 770         msg[1].flags = I2C_M_RD;
 771         msg[1].buf = data;
 772         if (single)
 773                 msg[1].len = 1;
 774         else
 775                 msg[1].len = 2;
 776
 777         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 778         if (ret < 0)
 779                 return ret;
 780
 781         if (!single)
 782                 ret = get_unaligned_le16(data);
 783         else
 784                 ret = data[0];
 785
 786         return ret;
 787 }
 788
 789 static int bq27x00_battery_probe(struct i2c_client *client,
 790                                  const struct i2c_device_id *id)
 791 {
 792         char *name;
 793         struct bq27x00_device_info *di;
 794         int num;
 795         int retval = 0;
 796
 797         /* Get new ID for the new battery device */
 798         mutex_lock(&battery_mutex);
 799         num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
 800         mutex_unlock(&battery_mutex);
 801         if (num < 0)
 802                 return num;
 803
 804         name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
 805         if (!name) {
 806                 dev_err(&client->dev, "failed to allocate device name\n");
 807                 retval = -ENOMEM;
 808                 goto batt_failed_1;
 809         }
 810
 811         di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
 812         if (!di) {
 813                 dev_err(&client->dev, "failed to allocate device info data\n");
 814                 retval = -ENOMEM;
 815                 goto batt_failed_2;
 816         }
 817
 818         di->id = num;
 819         di->dev = &client->dev;
 820         di->chip = id->driver_data;
 821         di->bat.name = name;
 822         di->bus.read = &bq27x00_read_i2c;
 823
 824         retval = bq27x00_powersupply_init(di);
 825         if (retval)
 826                 goto batt_failed_2;
 827
 828         i2c_set_clientdata(client, di);
 829
 830         return 0;
 831
 832 batt_failed_2:
 833         kfree(name);
 834 batt_failed_1:
 835         mutex_lock(&battery_mutex);
 836         idr_remove(&battery_id, num);
 837         mutex_unlock(&battery_mutex);
 838
 839         return retval;
 840 }
 841
 842 static int bq27x00_battery_remove(struct i2c_client *client)
 843 {
 844         struct bq27x00_device_info *di = i2c_get_clientdata(client);
 845
 846         bq27x00_powersupply_unregister(di);
 847
 848         kfree(di->bat.name);
 849
 850         mutex_lock(&battery_mutex);
 851         idr_remove(&battery_id, di->id);
 852         mutex_unlock(&battery_mutex);
 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
 937         if (!pdata) {
 938                 dev_err(&pdev->dev, "no platform_data supplied\n");
 939                 return -EINVAL;
 940         }
 941
 942         if (!pdata->read) {
 943                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
 944                 return -EINVAL;
 945         }
 946
 947         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
 948         if (!di) {
 949                 dev_err(&pdev->dev, "failed to allocate device info data\n");
 950                 return -ENOMEM;
 951         }
 952
 953         platform_set_drvdata(pdev, di);
 954
 955         di->dev = &pdev->dev;
 956         di->chip = BQ27000;
 957
 958         di->bat.name = pdata->name ?: dev_name(&pdev->dev);
 959         di->bus.read = &bq27000_read_platform;
 960
 961         return bq27x00_powersupply_init(di);
 962 }
 963
 964 static int bq27000_battery_remove(struct platform_device *pdev)
 965 {
 966         struct bq27x00_device_info *di = platform_get_drvdata(pdev);
 967
 968         bq27x00_powersupply_unregister(di);
 969
 970         return 0;
 971 }
 972
 973 static struct platform_driver bq27000_battery_driver = {
 974         .probe  = bq27000_battery_probe,
 975         .remove = bq27000_battery_remove,
 976         .driver = {
 977                 .name = "bq27000-battery",
 978                 .owner = THIS_MODULE,
 979         },
 980 };
 981
 982 static inline int bq27x00_battery_platform_init(void)
 983 {
 984         int ret = platform_driver_register(&bq27000_battery_driver);
 985         if (ret)
 986                 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
 987
 988         return ret;
 989 }
 990
 991 static inline void bq27x00_battery_platform_exit(void)
 992 {
 993         platform_driver_unregister(&bq27000_battery_driver);
 994 }
 995
 996 #else
 997
 998 static inline int bq27x00_battery_platform_init(void) { return 0; }
 999 static inline void bq27x00_battery_platform_exit(void) {};
1000
1001 #endif
1002
1003 /*
1004  * Module stuff
1005  */
1006
1007 static int __init bq27x00_battery_init(void)
1008 {
1009         int ret;
1010
1011         ret = bq27x00_battery_i2c_init();
1012         if (ret)
1013                 return ret;
1014
1015         ret = bq27x00_battery_platform_init();
1016         if (ret)
1017                 bq27x00_battery_i2c_exit();
1018
1019         return ret;
1020 }
1021 module_init(bq27x00_battery_init);
1022
1023 static void __exit bq27x00_battery_exit(void)
1024 {
1025         bq27x00_battery_platform_exit();
1026         bq27x00_battery_i2c_exit();
1027 }
1028 module_exit(bq27x00_battery_exit);
1029
1030 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1031 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1032 MODULE_LICENSE("GPL");