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  * http://www.ti.com/product/BQ27742-G1
  27  */
  28
  29 #include <linux/device.h>
  30 #include <linux/module.h>
  31 #include <linux/param.h>
  32 #include <linux/jiffies.h>
  33 #include <linux/workqueue.h>
  34 #include <linux/delay.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/power_supply.h>
  37 #include <linux/idr.h>
  38 #include <linux/i2c.h>
  39 #include <linux/slab.h>
  40 #include <asm/unaligned.h>
  41
  42 #include <linux/power/bq27x00_battery.h>
  43
  44 #define DRIVER_VERSION                  "1.2.0"
  45
  46 #define BQ27x00_REG_TEMP                0x06
  47 #define BQ27x00_REG_VOLT                0x08
  48 #define BQ27x00_REG_AI                  0x14
  49 #define BQ27x00_REG_FLAGS               0x0A
  50 #define BQ27x00_REG_TTE                 0x16
  51 #define BQ27x00_REG_TTF                 0x18
  52 #define BQ27x00_REG_TTECP               0x26
  53 #define BQ27x00_REG_NAC                 0x0C /* Nominal available capacity */
  54 #define BQ27x00_REG_LMD                 0x12 /* Last measured discharge */
  55 #define BQ27x00_REG_CYCT                0x2A /* Cycle count total */
  56 #define BQ27x00_REG_AE                  0x22 /* Available energy */
  57 #define BQ27x00_POWER_AVG               0x24
  58
  59 #define BQ27000_REG_RSOC                0x0B /* Relative State-of-Charge */
  60 #define BQ27000_REG_ILMD                0x76 /* Initial last measured discharge */
  61 #define BQ27000_FLAG_EDVF               BIT(0) /* Final End-of-Discharge-Voltage flag */
  62 #define BQ27000_FLAG_EDV1               BIT(1) /* First End-of-Discharge-Voltage flag */
  63 #define BQ27000_FLAG_CI                 BIT(4) /* Capacity Inaccurate flag */
  64 #define BQ27000_FLAG_FC                 BIT(5)
  65 #define BQ27000_FLAG_CHGS               BIT(7) /* Charge state flag */
  66
  67 #define BQ27500_REG_SOC                 0x2C
  68 #define BQ27500_REG_DCAP                0x3C /* Design capacity */
  69 #define BQ27500_FLAG_DSC                BIT(0)
  70 #define BQ27500_FLAG_SOCF               BIT(1) /* State-of-Charge threshold final */
  71 #define BQ27500_FLAG_SOC1               BIT(2) /* State-of-Charge threshold 1 */
  72 #define BQ27500_FLAG_FC                 BIT(9)
  73 #define BQ27500_FLAG_OTC                BIT(15)
  74
  75 #define BQ27742_POWER_AVG               0x76
  76
  77 /* bq27425 register addresses are same as bq27x00 addresses minus 4 */
  78 #define BQ27425_REG_OFFSET              0x04
  79 #define BQ27425_REG_SOC         (0x1C + BQ27425_REG_OFFSET)
  80 #define BQ27425_REG_DCAP                (0x3C + BQ27425_REG_OFFSET)
  81
  82 #define BQ27000_RS                      20 /* Resistor sense */
  83 #define BQ27x00_POWER_CONSTANT          (256 * 29200 / 1000)
  84
  85 struct bq27x00_device_info;
  86 struct bq27x00_access_methods {
  87         int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
  88 };
  89
  90 enum bq27x00_chip { BQ27000, BQ27500, BQ27425, BQ27742};
  91
  92 struct bq27x00_reg_cache {
  93         int temperature;
  94         int time_to_empty;
  95         int time_to_empty_avg;
  96         int time_to_full;
  97         int charge_full;
  98         int cycle_count;
  99         int capacity;
 100         int energy;
 101         int flags;
 102         int power_avg;
 103         int health;
 104 };
 105
 106 struct bq27x00_device_info {
 107         struct device           *dev;
 108         int                     id;
 109         enum bq27x00_chip       chip;
 110
 111         struct bq27x00_reg_cache cache;
 112         int charge_design_full;
 113
 114         unsigned long last_update;
 115         struct delayed_work work;
 116
 117         struct power_supply     bat;
 118
 119         struct bq27x00_access_methods bus;
 120
 121         struct mutex lock;
 122 };
 123
 124 static enum power_supply_property bq27x00_battery_props[] = {
 125         POWER_SUPPLY_PROP_STATUS,
 126         POWER_SUPPLY_PROP_PRESENT,
 127         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 128         POWER_SUPPLY_PROP_CURRENT_NOW,
 129         POWER_SUPPLY_PROP_CAPACITY,
 130         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 131         POWER_SUPPLY_PROP_TEMP,
 132         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 133         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 134         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 135         POWER_SUPPLY_PROP_TECHNOLOGY,
 136         POWER_SUPPLY_PROP_CHARGE_FULL,
 137         POWER_SUPPLY_PROP_CHARGE_NOW,
 138         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 139         POWER_SUPPLY_PROP_CYCLE_COUNT,
 140         POWER_SUPPLY_PROP_ENERGY_NOW,
 141         POWER_SUPPLY_PROP_POWER_AVG,
 142         POWER_SUPPLY_PROP_HEALTH,
 143 };
 144
 145 static enum power_supply_property bq27425_battery_props[] = {
 146         POWER_SUPPLY_PROP_STATUS,
 147         POWER_SUPPLY_PROP_PRESENT,
 148         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 149         POWER_SUPPLY_PROP_CURRENT_NOW,
 150         POWER_SUPPLY_PROP_CAPACITY,
 151         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 152         POWER_SUPPLY_PROP_TEMP,
 153         POWER_SUPPLY_PROP_TECHNOLOGY,
 154         POWER_SUPPLY_PROP_CHARGE_FULL,
 155         POWER_SUPPLY_PROP_CHARGE_NOW,
 156         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 157 };
 158
 159 static enum power_supply_property bq27742_battery_props[] = {
 160         POWER_SUPPLY_PROP_STATUS,
 161         POWER_SUPPLY_PROP_PRESENT,
 162         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 163         POWER_SUPPLY_PROP_CURRENT_NOW,
 164         POWER_SUPPLY_PROP_CAPACITY,
 165         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 166         POWER_SUPPLY_PROP_TEMP,
 167         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 168         POWER_SUPPLY_PROP_TECHNOLOGY,
 169         POWER_SUPPLY_PROP_CHARGE_FULL,
 170         POWER_SUPPLY_PROP_CHARGE_NOW,
 171         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 172         POWER_SUPPLY_PROP_CYCLE_COUNT,
 173         POWER_SUPPLY_PROP_POWER_AVG,
 174         POWER_SUPPLY_PROP_HEALTH,
 175 };
 176
 177 static unsigned int poll_interval = 360;
 178 module_param(poll_interval, uint, 0644);
 179 MODULE_PARM_DESC(poll_interval, "battery poll interval in seconds - " \
 180                                 "0 disables polling");
 181
 182 /*
 183  * Common code for BQ27x00 devices
 184  */
 185
 186 static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
 187                 bool single)
 188 {
 189         if (di->chip == BQ27425)
 190                 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
 191         return di->bus.read(di, reg, single);
 192 }
 193
 194 /*
 195  * Higher versions of the chip like BQ27425 and BQ27500
 196  * differ from BQ27000 and BQ27200 in calculation of certain
 197  * parameters. Hence we need to check for the chip type.
 198  */
 199 static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
 200 {
 201         if (di->chip == BQ27425 || di->chip == BQ27500 || di->chip == BQ27742)
 202                 return true;
 203         return false;
 204 }
 205
 206 /*
 207  * Return the battery Relative State-of-Charge
 208  * Or < 0 if something fails.
 209  */
 210 static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
 211 {
 212         int rsoc;
 213
 214         if (di->chip == BQ27500 || di->chip == BQ27742)
 215                 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
 216         else if (di->chip == BQ27425)
 217                 rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
 218         else
 219                 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
 220
 221         if (rsoc < 0)
 222                 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
 223
 224         return rsoc;
 225 }
 226
 227 /*
 228  * Return a battery charge value in µAh
 229  * Or < 0 if something fails.
 230  */
 231 static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
 232 {
 233         int charge;
 234
 235         charge = bq27x00_read(di, reg, false);
 236         if (charge < 0) {
 237                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 238                         reg, charge);
 239                 return charge;
 240         }
 241
 242         if (bq27xxx_is_chip_version_higher(di))
 243                 charge *= 1000;
 244         else
 245                 charge = charge * 3570 / BQ27000_RS;
 246
 247         return charge;
 248 }
 249
 250 /*
 251  * Return the battery Nominal available capaciy in µAh
 252  * Or < 0 if something fails.
 253  */
 254 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
 255 {
 256         int flags;
 257         bool is_bq27500 = di->chip == BQ27500;
 258         bool is_bq27742 = di->chip == BQ27742;
 259         bool is_higher = bq27xxx_is_chip_version_higher(di);
 260         bool flags_1b = !(is_bq27500 || is_bq27742);
 261
 262         flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
 263         if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
 264                 return -ENODATA;
 265
 266         return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
 267 }
 268
 269 /*
 270  * Return the battery Last measured discharge in µAh
 271  * Or < 0 if something fails.
 272  */
 273 static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
 274 {
 275         return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
 276 }
 277
 278 /*
 279  * Return the battery Initial last measured discharge in µAh
 280  * Or < 0 if something fails.
 281  */
 282 static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
 283 {
 284         int ilmd;
 285
 286         if (bq27xxx_is_chip_version_higher(di)) {
 287                 if (di->chip == BQ27425)
 288                         ilmd = bq27x00_read(di, BQ27425_REG_DCAP, false);
 289                 else
 290                         ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
 291         } else
 292                 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
 293
 294         if (ilmd < 0) {
 295                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 296                 return ilmd;
 297         }
 298
 299         if (bq27xxx_is_chip_version_higher(di))
 300                 ilmd *= 1000;
 301         else
 302                 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
 303
 304         return ilmd;
 305 }
 306
 307 /*
 308  * Return the battery Available energy in µWh
 309  * Or < 0 if something fails.
 310  */
 311 static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
 312 {
 313         int ae;
 314
 315         ae = bq27x00_read(di, BQ27x00_REG_AE, false);
 316         if (ae < 0) {
 317                 dev_dbg(di->dev, "error reading available energy\n");
 318                 return ae;
 319         }
 320
 321         if (di->chip == BQ27500)
 322                 ae *= 1000;
 323         else
 324                 ae = ae * 29200 / BQ27000_RS;
 325
 326         return ae;
 327 }
 328
 329 /*
 330  * Return the battery temperature in tenths of degree Kelvin
 331  * Or < 0 if something fails.
 332  */
 333 static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
 334 {
 335         int temp;
 336
 337         temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
 338         if (temp < 0) {
 339                 dev_err(di->dev, "error reading temperature\n");
 340                 return temp;
 341         }
 342
 343         if (!bq27xxx_is_chip_version_higher(di))
 344                 temp = 5 * temp / 2;
 345
 346         return temp;
 347 }
 348
 349 /*
 350  * Return the battery Cycle count total
 351  * Or < 0 if something fails.
 352  */
 353 static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
 354 {
 355         int cyct;
 356
 357         cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
 358         if (cyct < 0)
 359                 dev_err(di->dev, "error reading cycle count total\n");
 360
 361         return cyct;
 362 }
 363
 364 /*
 365  * Read a time register.
 366  * Return < 0 if something fails.
 367  */
 368 static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
 369 {
 370         int tval;
 371
 372         tval = bq27x00_read(di, reg, false);
 373         if (tval < 0) {
 374                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 375                         reg, tval);
 376                 return tval;
 377         }
 378
 379         if (tval == 65535)
 380                 return -ENODATA;
 381
 382         return tval * 60;
 383 }
 384
 385 /*
 386  * Read a power avg register.
 387  * Return < 0 if something fails.
 388  */
 389 static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
 390 {
 391         int tval;
 392
 393         tval = bq27x00_read(di, reg, false);
 394         if (tval < 0) {
 395                 dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
 396                         reg, tval);
 397                 return tval;
 398         }
 399
 400         if (di->chip == BQ27500)
 401                 return tval;
 402         else
 403                 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
 404 }
 405
 406 /*
 407  * Read flag register.
 408  * Return < 0 if something fails.
 409  */
 410 static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
 411 {
 412         int tval;
 413
 414         tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 415         if (tval < 0) {
 416                 dev_err(di->dev, "error reading flag register:%d\n", tval);
 417                 return tval;
 418         }
 419
 420         if ((di->chip == BQ27500)) {
 421                 if (tval & BQ27500_FLAG_SOCF)
 422                         tval = POWER_SUPPLY_HEALTH_DEAD;
 423                 else if (tval & BQ27500_FLAG_OTC)
 424                         tval = POWER_SUPPLY_HEALTH_OVERHEAT;
 425                 else
 426                         tval = POWER_SUPPLY_HEALTH_GOOD;
 427                 return tval;
 428         } else {
 429                 if (tval & BQ27000_FLAG_EDV1)
 430                         tval = POWER_SUPPLY_HEALTH_DEAD;
 431                 else
 432                         tval = POWER_SUPPLY_HEALTH_GOOD;
 433                 return tval;
 434         }
 435
 436         return -1;
 437 }
 438
 439 static void bq27x00_update(struct bq27x00_device_info *di)
 440 {
 441         struct bq27x00_reg_cache cache = {0, };
 442         bool is_bq27500 = di->chip == BQ27500;
 443         bool is_bq27425 = di->chip == BQ27425;
 444         bool is_bq27742 = di->chip == BQ27742;
 445         bool flags_1b = !(is_bq27500 || is_bq27742);
 446
 447         cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
 448         if ((cache.flags & 0xff) == 0xff)
 449                 /* read error */
 450                 cache.flags = -1;
 451         if (cache.flags >= 0) {
 452                 if (!is_bq27500 && !is_bq27425 && !is_bq27742
 453                                 && (cache.flags & BQ27000_FLAG_CI)) {
 454                         dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
 455                         cache.capacity = -ENODATA;
 456                         cache.energy = -ENODATA;
 457                         cache.time_to_empty = -ENODATA;
 458                         cache.time_to_empty_avg = -ENODATA;
 459                         cache.time_to_full = -ENODATA;
 460                         cache.charge_full = -ENODATA;
 461                         cache.health = -ENODATA;
 462                 } else {
 463                         cache.capacity = bq27x00_battery_read_rsoc(di);
 464                         if (is_bq27742)
 465                                 cache.time_to_empty =
 466                                         bq27x00_battery_read_time(di,
 467                                                         BQ27x00_REG_TTE);
 468                         else if (!is_bq27425) {
 469                                 cache.energy = bq27x00_battery_read_energy(di);
 470                                 cache.time_to_empty =
 471                                         bq27x00_battery_read_time(di,
 472                                                         BQ27x00_REG_TTE);
 473                                 cache.time_to_empty_avg =
 474                                         bq27x00_battery_read_time(di,
 475                                                         BQ27x00_REG_TTECP);
 476                                 cache.time_to_full =
 477                                         bq27x00_battery_read_time(di,
 478                                                         BQ27x00_REG_TTF);
 479                         }
 480                         cache.charge_full = bq27x00_battery_read_lmd(di);
 481                         cache.health = bq27x00_battery_read_health(di);
 482                 }
 483                 cache.temperature = bq27x00_battery_read_temperature(di);
 484                 if (!is_bq27425)
 485                         cache.cycle_count = bq27x00_battery_read_cyct(di);
 486                 if (is_bq27742)
 487                         cache.power_avg =
 488                                 bq27x00_battery_read_pwr_avg(di,
 489                                                 BQ27742_POWER_AVG);
 490                 else
 491                         cache.power_avg =
 492                                 bq27x00_battery_read_pwr_avg(di,
 493                                                 BQ27x00_POWER_AVG);
 494
 495                 /* We only have to read charge design full once */
 496                 if (di->charge_design_full <= 0)
 497                         di->charge_design_full = bq27x00_battery_read_ilmd(di);
 498         }
 499
 500         if (di->cache.capacity != cache.capacity)
 501                 power_supply_changed(&di->bat);
 502
 503         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 504                 di->cache = cache;
 505
 506         di->last_update = jiffies;
 507 }
 508
 509 static void bq27x00_battery_poll(struct work_struct *work)
 510 {
 511         struct bq27x00_device_info *di =
 512                 container_of(work, struct bq27x00_device_info, work.work);
 513
 514         bq27x00_update(di);
 515
 516         if (poll_interval > 0) {
 517                 /* The timer does not have to be accurate. */
 518                 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
 519                 schedule_delayed_work(&di->work, poll_interval * HZ);
 520         }
 521 }
 522
 523 /*
 524  * Return the battery average current in µA
 525  * Note that current can be negative signed as well
 526  * Or 0 if something fails.
 527  */
 528 static int bq27x00_battery_current(struct bq27x00_device_info *di,
 529         union power_supply_propval *val)
 530 {
 531         int curr;
 532         int flags;
 533
 534         curr = bq27x00_read(di, BQ27x00_REG_AI, false);
 535         if (curr < 0) {
 536                 dev_err(di->dev, "error reading current\n");
 537                 return curr;
 538         }
 539
 540         if (bq27xxx_is_chip_version_higher(di)) {
 541                 /* bq27500 returns signed value */
 542                 val->intval = (int)((s16)curr) * 1000;
 543         } else {
 544                 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 545                 if (flags & BQ27000_FLAG_CHGS) {
 546                         dev_dbg(di->dev, "negative current!\n");
 547                         curr = -curr;
 548                 }
 549
 550                 val->intval = curr * 3570 / BQ27000_RS;
 551         }
 552
 553         return 0;
 554 }
 555
 556 static int bq27x00_battery_status(struct bq27x00_device_info *di,
 557         union power_supply_propval *val)
 558 {
 559         int status;
 560
 561         if (bq27xxx_is_chip_version_higher(di)) {
 562                 if (di->cache.flags & BQ27500_FLAG_FC)
 563                         status = POWER_SUPPLY_STATUS_FULL;
 564                 else if (di->cache.flags & BQ27500_FLAG_DSC)
 565                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 566                 else
 567                         status = POWER_SUPPLY_STATUS_CHARGING;
 568         } else {
 569                 if (di->cache.flags & BQ27000_FLAG_FC)
 570                         status = POWER_SUPPLY_STATUS_FULL;
 571                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 572                         status = POWER_SUPPLY_STATUS_CHARGING;
 573                 else if (power_supply_am_i_supplied(&di->bat))
 574                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 575                 else
 576                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 577         }
 578
 579         val->intval = status;
 580
 581         return 0;
 582 }
 583
 584 static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
 585         union power_supply_propval *val)
 586 {
 587         int level;
 588
 589         if (bq27xxx_is_chip_version_higher(di)) {
 590                 if (di->cache.flags & BQ27500_FLAG_FC)
 591                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 592                 else if (di->cache.flags & BQ27500_FLAG_SOC1)
 593                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 594                 else if (di->cache.flags & BQ27500_FLAG_SOCF)
 595                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 596                 else
 597                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 598         } else {
 599                 if (di->cache.flags & BQ27000_FLAG_FC)
 600                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 601                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 602                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 603                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 604                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 605                 else
 606                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 607         }
 608
 609         val->intval = level;
 610
 611         return 0;
 612 }
 613
 614 /*
 615  * Return the battery Voltage in millivolts
 616  * Or < 0 if something fails.
 617  */
 618 static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
 619         union power_supply_propval *val)
 620 {
 621         int volt;
 622
 623         volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
 624         if (volt < 0) {
 625                 dev_err(di->dev, "error reading voltage\n");
 626                 return volt;
 627         }
 628
 629         val->intval = volt * 1000;
 630
 631         return 0;
 632 }
 633
 634 static int bq27x00_simple_value(int value,
 635         union power_supply_propval *val)
 636 {
 637         if (value < 0)
 638                 return value;
 639
 640         val->intval = value;
 641
 642         return 0;
 643 }
 644
 645 #define to_bq27x00_device_info(x) container_of((x), \
 646                                 struct bq27x00_device_info, bat);
 647
 648 static int bq27x00_battery_get_property(struct power_supply *psy,
 649                                         enum power_supply_property psp,
 650                                         union power_supply_propval *val)
 651 {
 652         int ret = 0;
 653         struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 654
 655         mutex_lock(&di->lock);
 656         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 657                 cancel_delayed_work_sync(&di->work);
 658                 bq27x00_battery_poll(&di->work.work);
 659         }
 660         mutex_unlock(&di->lock);
 661
 662         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 663                 return -ENODEV;
 664
 665         switch (psp) {
 666         case POWER_SUPPLY_PROP_STATUS:
 667                 ret = bq27x00_battery_status(di, val);
 668                 break;
 669         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 670                 ret = bq27x00_battery_voltage(di, val);
 671                 break;
 672         case POWER_SUPPLY_PROP_PRESENT:
 673                 val->intval = di->cache.flags < 0 ? 0 : 1;
 674                 break;
 675         case POWER_SUPPLY_PROP_CURRENT_NOW:
 676                 ret = bq27x00_battery_current(di, val);
 677                 break;
 678         case POWER_SUPPLY_PROP_CAPACITY:
 679                 ret = bq27x00_simple_value(di->cache.capacity, val);
 680                 break;
 681         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 682                 ret = bq27x00_battery_capacity_level(di, val);
 683                 break;
 684         case POWER_SUPPLY_PROP_TEMP:
 685                 ret = bq27x00_simple_value(di->cache.temperature, val);
 686                 if (ret == 0)
 687                         val->intval -= 2731;
 688                 break;
 689         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 690                 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
 691                 break;
 692         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 693                 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
 694                 break;
 695         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 696                 ret = bq27x00_simple_value(di->cache.time_to_full, val);
 697                 break;
 698         case POWER_SUPPLY_PROP_TECHNOLOGY:
 699                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 700                 break;
 701         case POWER_SUPPLY_PROP_CHARGE_NOW:
 702                 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
 703                 break;
 704         case POWER_SUPPLY_PROP_CHARGE_FULL:
 705                 ret = bq27x00_simple_value(di->cache.charge_full, val);
 706                 break;
 707         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 708                 ret = bq27x00_simple_value(di->charge_design_full, val);
 709                 break;
 710         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 711                 ret = bq27x00_simple_value(di->cache.cycle_count, val);
 712                 break;
 713         case POWER_SUPPLY_PROP_ENERGY_NOW:
 714                 ret = bq27x00_simple_value(di->cache.energy, val);
 715                 break;
 716         case POWER_SUPPLY_PROP_POWER_AVG:
 717                 ret = bq27x00_simple_value(di->cache.power_avg, val);
 718                 break;
 719         case POWER_SUPPLY_PROP_HEALTH:
 720                 ret = bq27x00_simple_value(di->cache.health, val);
 721                 break;
 722         default:
 723                 return -EINVAL;
 724         }
 725
 726         return ret;
 727 }
 728
 729 static void bq27x00_external_power_changed(struct power_supply *psy)
 730 {
 731         struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
 732
 733         cancel_delayed_work_sync(&di->work);
 734         schedule_delayed_work(&di->work, 0);
 735 }
 736
 737 static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
 738 {
 739         int ret;
 740
 741         di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
 742         if (di->chip == BQ27425) {
 743                 di->bat.properties = bq27425_battery_props;
 744                 di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
 745         } else if (di->chip == BQ27742) {
 746                 di->bat.properties = bq27742_battery_props;
 747                 di->bat.num_properties = ARRAY_SIZE(bq27742_battery_props);
 748         } else {
 749                 di->bat.properties = bq27x00_battery_props;
 750                 di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
 751         }
 752         di->bat.get_property = bq27x00_battery_get_property;
 753         di->bat.external_power_changed = bq27x00_external_power_changed;
 754
 755         INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
 756         mutex_init(&di->lock);
 757
 758         ret = power_supply_register(di->dev, &di->bat);
 759         if (ret) {
 760                 dev_err(di->dev, "failed to register battery: %d\n", ret);
 761                 return ret;
 762         }
 763
 764         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 765
 766         bq27x00_update(di);
 767
 768         return 0;
 769 }
 770
 771 static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
 772 {
 773         /*
 774          * power_supply_unregister call bq27x00_battery_get_property which
 775          * call bq27x00_battery_poll.
 776          * Make sure that bq27x00_battery_poll will not call
 777          * schedule_delayed_work again after unregister (which cause OOPS).
 778          */
 779         poll_interval = 0;
 780
 781         cancel_delayed_work_sync(&di->work);
 782
 783         power_supply_unregister(&di->bat);
 784
 785         mutex_destroy(&di->lock);
 786 }
 787
 788
 789 /* i2c specific code */
 790 #ifdef CONFIG_BATTERY_BQ27X00_I2C
 791
 792 /* If the system has several batteries we need a different name for each
 793  * of them...
 794  */
 795 static DEFINE_IDR(battery_id);
 796 static DEFINE_MUTEX(battery_mutex);
 797
 798 static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
 799 {
 800         struct i2c_client *client = to_i2c_client(di->dev);
 801         struct i2c_msg msg[2];
 802         unsigned char data[2];
 803         int ret;
 804
 805         if (!client->adapter)
 806                 return -ENODEV;
 807
 808         msg[0].addr = client->addr;
 809         msg[0].flags = 0;
 810         msg[0].buf = &reg;
 811         msg[0].len = sizeof(reg);
 812         msg[1].addr = client->addr;
 813         msg[1].flags = I2C_M_RD;
 814         msg[1].buf = data;
 815         if (single)
 816                 msg[1].len = 1;
 817         else
 818                 msg[1].len = 2;
 819
 820         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 821         if (ret < 0)
 822                 return ret;
 823
 824         if (!single)
 825                 ret = get_unaligned_le16(data);
 826         else
 827                 ret = data[0];
 828
 829         return ret;
 830 }
 831
 832 static int bq27x00_battery_probe(struct i2c_client *client,
 833                                  const struct i2c_device_id *id)
 834 {
 835         char *name;
 836         struct bq27x00_device_info *di;
 837         int num;
 838         int retval = 0;
 839
 840         /* Get new ID for the new battery device */
 841         mutex_lock(&battery_mutex);
 842         num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
 843         mutex_unlock(&battery_mutex);
 844         if (num < 0)
 845                 return num;
 846
 847         name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
 848         if (!name) {
 849                 dev_err(&client->dev, "failed to allocate device name\n");
 850                 retval = -ENOMEM;
 851                 goto batt_failed_1;
 852         }
 853
 854         di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
 855         if (!di) {
 856                 dev_err(&client->dev, "failed to allocate device info data\n");
 857                 retval = -ENOMEM;
 858                 goto batt_failed_2;
 859         }
 860
 861         di->id = num;
 862         di->dev = &client->dev;
 863         di->chip = id->driver_data;
 864         di->bat.name = name;
 865         di->bus.read = &bq27x00_read_i2c;
 866
 867         retval = bq27x00_powersupply_init(di);
 868         if (retval)
 869                 goto batt_failed_2;
 870
 871         i2c_set_clientdata(client, di);
 872
 873         return 0;
 874
 875 batt_failed_2:
 876         kfree(name);
 877 batt_failed_1:
 878         mutex_lock(&battery_mutex);
 879         idr_remove(&battery_id, num);
 880         mutex_unlock(&battery_mutex);
 881
 882         return retval;
 883 }
 884
 885 static int bq27x00_battery_remove(struct i2c_client *client)
 886 {
 887         struct bq27x00_device_info *di = i2c_get_clientdata(client);
 888
 889         bq27x00_powersupply_unregister(di);
 890
 891         kfree(di->bat.name);
 892
 893         mutex_lock(&battery_mutex);
 894         idr_remove(&battery_id, di->id);
 895         mutex_unlock(&battery_mutex);
 896
 897         return 0;
 898 }
 899
 900 static const struct i2c_device_id bq27x00_id[] = {
 901         { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
 902         { "bq27500", BQ27500 },
 903         { "bq27425", BQ27425 },
 904         { "bq27742", BQ27742 },
 905         {},
 906 };
 907 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
 908
 909 static struct i2c_driver bq27x00_battery_driver = {
 910         .driver = {
 911                 .name = "bq27x00-battery",
 912         },
 913         .probe = bq27x00_battery_probe,
 914         .remove = bq27x00_battery_remove,
 915         .id_table = bq27x00_id,
 916 };
 917
 918 static inline int bq27x00_battery_i2c_init(void)
 919 {
 920         int ret = i2c_add_driver(&bq27x00_battery_driver);
 921         if (ret)
 922                 printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
 923
 924         return ret;
 925 }
 926
 927 static inline void bq27x00_battery_i2c_exit(void)
 928 {
 929         i2c_del_driver(&bq27x00_battery_driver);
 930 }
 931
 932 #else
 933
 934 static inline int bq27x00_battery_i2c_init(void) { return 0; }
 935 static inline void bq27x00_battery_i2c_exit(void) {};
 936
 937 #endif
 938
 939 /* platform specific code */
 940 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
 941
 942 static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
 943                         bool single)
 944 {
 945         struct device *dev = di->dev;
 946         struct bq27000_platform_data *pdata = dev->platform_data;
 947         unsigned int timeout = 3;
 948         int upper, lower;
 949         int temp;
 950
 951         if (!single) {
 952                 /* Make sure the value has not changed in between reading the
 953                  * lower and the upper part */
 954                 upper = pdata->read(dev, reg + 1);
 955                 do {
 956                         temp = upper;
 957                         if (upper < 0)
 958                                 return upper;
 959
 960                         lower = pdata->read(dev, reg);
 961                         if (lower < 0)
 962                                 return lower;
 963
 964                         upper = pdata->read(dev, reg + 1);
 965                 } while (temp != upper && --timeout);
 966
 967                 if (timeout == 0)
 968                         return -EIO;
 969
 970                 return (upper << 8) | lower;
 971         }
 972
 973         return pdata->read(dev, reg);
 974 }
 975
 976 static int bq27000_battery_probe(struct platform_device *pdev)
 977 {
 978         struct bq27x00_device_info *di;
 979         struct bq27000_platform_data *pdata = pdev->dev.platform_data;
 980
 981         if (!pdata) {
 982                 dev_err(&pdev->dev, "no platform_data supplied\n");
 983                 return -EINVAL;
 984         }
 985
 986         if (!pdata->read) {
 987                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
 988                 return -EINVAL;
 989         }
 990
 991         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
 992         if (!di) {
 993                 dev_err(&pdev->dev, "failed to allocate device info data\n");
 994                 return -ENOMEM;
 995         }
 996
 997         platform_set_drvdata(pdev, di);
 998
 999         di->dev = &pdev->dev;
1000         di->chip = BQ27000;
1001
1002         di->bat.name = pdata->name ?: dev_name(&pdev->dev);
1003         di->bus.read = &bq27000_read_platform;
1004
1005         return bq27x00_powersupply_init(di);
1006 }
1007
1008 static int bq27000_battery_remove(struct platform_device *pdev)
1009 {
1010         struct bq27x00_device_info *di = platform_get_drvdata(pdev);
1011
1012         bq27x00_powersupply_unregister(di);
1013
1014         return 0;
1015 }
1016
1017 static struct platform_driver bq27000_battery_driver = {
1018         .probe  = bq27000_battery_probe,
1019         .remove = bq27000_battery_remove,
1020         .driver = {
1021                 .name = "bq27000-battery",
1022         },
1023 };
1024
1025 static inline int bq27x00_battery_platform_init(void)
1026 {
1027         int ret = platform_driver_register(&bq27000_battery_driver);
1028         if (ret)
1029                 printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
1030
1031         return ret;
1032 }
1033
1034 static inline void bq27x00_battery_platform_exit(void)
1035 {
1036         platform_driver_unregister(&bq27000_battery_driver);
1037 }
1038
1039 #else
1040
1041 static inline int bq27x00_battery_platform_init(void) { return 0; }
1042 static inline void bq27x00_battery_platform_exit(void) {};
1043
1044 #endif
1045
1046 /*
1047  * Module stuff
1048  */
1049
1050 static int __init bq27x00_battery_init(void)
1051 {
1052         int ret;
1053
1054         ret = bq27x00_battery_i2c_init();
1055         if (ret)
1056                 return ret;
1057
1058         ret = bq27x00_battery_platform_init();
1059         if (ret)
1060                 bq27x00_battery_i2c_exit();
1061
1062         return ret;
1063 }
1064 module_init(bq27x00_battery_init);
1065
1066 static void __exit bq27x00_battery_exit(void)
1067 {
1068         bq27x00_battery_platform_exit();
1069         bq27x00_battery_i2c_exit();
1070 }
1071 module_exit(bq27x00_battery_exit);
1072
1073 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1074 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1075 MODULE_LICENSE("GPL");