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  * Datasheets:
  20  * http://focus.ti.com/docs/prod/folders/print/bq27000.html
  21  * http://focus.ti.com/docs/prod/folders/print/bq27500.html
  22  * http://www.ti.com/product/bq27425-g1
  23  * http://www.ti.com/product/BQ27742-G1
  24  * http://www.ti.com/product/BQ27510-G3
  25  */
  26
  27 #include <linux/device.h>
  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 BQ27XXX_MANUFACTURER    "Texas Instruments"
  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 #define BQ27510_REG_SOC         0x20
  78 #define BQ27510_REG_DCAP        0x2E /* Design capacity */
  79 #define BQ27510_REG_CYCT        0x1E /* Cycle count total */
  80
  81 /* bq27425 register addresses are same as bq27x00 addresses minus 4 */
  82 #define BQ27425_REG_OFFSET      0x04
  83 #define BQ27425_REG_SOC         (0x1C + BQ27425_REG_OFFSET)
  84 #define BQ27425_REG_DCAP        (0x3C + BQ27425_REG_OFFSET)
  85
  86 #define BQ27000_RS                      20 /* Resistor sense */
  87 #define BQ27x00_POWER_CONSTANT          (256 * 29200 / 1000)
  88
  89 struct bq27x00_device_info;
  90 struct bq27x00_access_methods {
  91         int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
  92 };
  93
  94 enum bq27x00_chip { BQ27000, BQ27500, BQ27425, BQ27742, BQ27510};
  95
  96 struct bq27x00_reg_cache {
  97         int temperature;
  98         int time_to_empty;
  99         int time_to_empty_avg;
 100         int time_to_full;
 101         int charge_full;
 102         int cycle_count;
 103         int capacity;
 104         int energy;
 105         int flags;
 106         int power_avg;
 107         int health;
 108 };
 109
 110 struct bq27x00_device_info {
 111         struct device           *dev;
 112         int                     id;
 113         enum bq27x00_chip       chip;
 114
 115         struct bq27x00_reg_cache cache;
 116         int charge_design_full;
 117
 118         unsigned long last_update;
 119         struct delayed_work work;
 120
 121         struct power_supply     *bat;
 122
 123         struct bq27x00_access_methods bus;
 124
 125         struct mutex lock;
 126 };
 127
 128 static enum power_supply_property bq27x00_battery_props[] = {
 129         POWER_SUPPLY_PROP_STATUS,
 130         POWER_SUPPLY_PROP_PRESENT,
 131         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 132         POWER_SUPPLY_PROP_CURRENT_NOW,
 133         POWER_SUPPLY_PROP_CAPACITY,
 134         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 135         POWER_SUPPLY_PROP_TEMP,
 136         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 137         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 138         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 139         POWER_SUPPLY_PROP_TECHNOLOGY,
 140         POWER_SUPPLY_PROP_CHARGE_FULL,
 141         POWER_SUPPLY_PROP_CHARGE_NOW,
 142         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 143         POWER_SUPPLY_PROP_CYCLE_COUNT,
 144         POWER_SUPPLY_PROP_ENERGY_NOW,
 145         POWER_SUPPLY_PROP_POWER_AVG,
 146         POWER_SUPPLY_PROP_HEALTH,
 147         POWER_SUPPLY_PROP_MANUFACTURER,
 148 };
 149
 150 static enum power_supply_property bq27425_battery_props[] = {
 151         POWER_SUPPLY_PROP_STATUS,
 152         POWER_SUPPLY_PROP_PRESENT,
 153         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 154         POWER_SUPPLY_PROP_CURRENT_NOW,
 155         POWER_SUPPLY_PROP_CAPACITY,
 156         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 157         POWER_SUPPLY_PROP_TEMP,
 158         POWER_SUPPLY_PROP_TECHNOLOGY,
 159         POWER_SUPPLY_PROP_CHARGE_FULL,
 160         POWER_SUPPLY_PROP_CHARGE_NOW,
 161         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 162         POWER_SUPPLY_PROP_MANUFACTURER,
 163 };
 164
 165 static enum power_supply_property bq27742_battery_props[] = {
 166         POWER_SUPPLY_PROP_STATUS,
 167         POWER_SUPPLY_PROP_PRESENT,
 168         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 169         POWER_SUPPLY_PROP_CURRENT_NOW,
 170         POWER_SUPPLY_PROP_CAPACITY,
 171         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 172         POWER_SUPPLY_PROP_TEMP,
 173         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 174         POWER_SUPPLY_PROP_TECHNOLOGY,
 175         POWER_SUPPLY_PROP_CHARGE_FULL,
 176         POWER_SUPPLY_PROP_CHARGE_NOW,
 177         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 178         POWER_SUPPLY_PROP_CYCLE_COUNT,
 179         POWER_SUPPLY_PROP_POWER_AVG,
 180         POWER_SUPPLY_PROP_HEALTH,
 181         POWER_SUPPLY_PROP_MANUFACTURER,
 182 };
 183
 184 static enum power_supply_property bq27510_battery_props[] = {
 185         POWER_SUPPLY_PROP_STATUS,
 186         POWER_SUPPLY_PROP_PRESENT,
 187         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 188         POWER_SUPPLY_PROP_CURRENT_NOW,
 189         POWER_SUPPLY_PROP_CAPACITY,
 190         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 191         POWER_SUPPLY_PROP_TEMP,
 192         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 193         POWER_SUPPLY_PROP_TECHNOLOGY,
 194         POWER_SUPPLY_PROP_CHARGE_FULL,
 195         POWER_SUPPLY_PROP_CHARGE_NOW,
 196         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 197         POWER_SUPPLY_PROP_CYCLE_COUNT,
 198         POWER_SUPPLY_PROP_POWER_AVG,
 199         POWER_SUPPLY_PROP_HEALTH,
 200         POWER_SUPPLY_PROP_MANUFACTURER,
 201 };
 202
 203 static unsigned int poll_interval = 360;
 204 module_param(poll_interval, uint, 0644);
 205 MODULE_PARM_DESC(poll_interval,
 206                  "battery poll interval in seconds - 0 disables polling");
 207
 208 /*
 209  * Common code for BQ27x00 devices
 210  */
 211
 212 static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
 213                                bool single)
 214 {
 215         if (di->chip == BQ27425)
 216                 return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
 217         return di->bus.read(di, reg, single);
 218 }
 219
 220 /*
 221  * Higher versions of the chip like BQ27425 and BQ27500
 222  * differ from BQ27000 and BQ27200 in calculation of certain
 223  * parameters. Hence we need to check for the chip type.
 224  */
 225 static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
 226 {
 227         if (di->chip == BQ27425 || di->chip == BQ27500 || di->chip == BQ27742
 228             || di->chip == BQ27510)
 229                 return true;
 230         return false;
 231 }
 232
 233 /*
 234  * Return the battery Relative State-of-Charge
 235  * Or < 0 if something fails.
 236  */
 237 static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
 238 {
 239         int rsoc;
 240
 241         if (di->chip == BQ27500 || di->chip == BQ27742)
 242                 rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
 243         else if (di->chip == BQ27510)
 244                 rsoc = bq27x00_read(di, BQ27510_REG_SOC, false);
 245         else if (di->chip == BQ27425)
 246                 rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
 247         else
 248                 rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
 249
 250         if (rsoc < 0)
 251                 dev_dbg(di->dev, "error reading relative State-of-Charge\n");
 252
 253         return rsoc;
 254 }
 255
 256 /*
 257  * Return a battery charge value in µAh
 258  * Or < 0 if something fails.
 259  */
 260 static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
 261 {
 262         int charge;
 263
 264         charge = bq27x00_read(di, reg, false);
 265         if (charge < 0) {
 266                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 267                         reg, charge);
 268                 return charge;
 269         }
 270
 271         if (bq27xxx_is_chip_version_higher(di))
 272                 charge *= 1000;
 273         else
 274                 charge = charge * 3570 / BQ27000_RS;
 275
 276         return charge;
 277 }
 278
 279 /*
 280  * Return the battery Nominal available capaciy in µAh
 281  * Or < 0 if something fails.
 282  */
 283 static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
 284 {
 285         int flags;
 286         bool is_bq27500 = di->chip == BQ27500;
 287         bool is_bq27742 = di->chip == BQ27742;
 288         bool is_higher = bq27xxx_is_chip_version_higher(di);
 289         bool flags_1b = !(is_bq27500 || is_bq27742);
 290
 291         flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
 292         if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
 293                 return -ENODATA;
 294
 295         return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
 296 }
 297
 298 /*
 299  * Return the battery Last measured discharge in µAh
 300  * Or < 0 if something fails.
 301  */
 302 static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
 303 {
 304         return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
 305 }
 306
 307 /*
 308  * Return the battery Initial last measured discharge in µAh
 309  * Or < 0 if something fails.
 310  */
 311 static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
 312 {
 313         int ilmd;
 314
 315         if (bq27xxx_is_chip_version_higher(di)) {
 316                 if (di->chip == BQ27425)
 317                         ilmd = bq27x00_read(di, BQ27425_REG_DCAP, false);
 318                 else if (di->chip == BQ27510)
 319                         ilmd = bq27x00_read(di, BQ27510_REG_DCAP, false);
 320                 else
 321                         ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
 322         } else {
 323                 ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
 324         }
 325
 326         if (ilmd < 0) {
 327                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 328                 return ilmd;
 329         }
 330
 331         if (bq27xxx_is_chip_version_higher(di))
 332                 ilmd *= 1000;
 333         else
 334                 ilmd = ilmd * 256 * 3570 / BQ27000_RS;
 335
 336         return ilmd;
 337 }
 338
 339 /*
 340  * Return the battery Available energy in µWh
 341  * Or < 0 if something fails.
 342  */
 343 static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
 344 {
 345         int ae;
 346
 347         ae = bq27x00_read(di, BQ27x00_REG_AE, false);
 348         if (ae < 0) {
 349                 dev_dbg(di->dev, "error reading available energy\n");
 350                 return ae;
 351         }
 352
 353         if (di->chip == BQ27500)
 354                 ae *= 1000;
 355         else
 356                 ae = ae * 29200 / BQ27000_RS;
 357
 358         return ae;
 359 }
 360
 361 /*
 362  * Return the battery temperature in tenths of degree Kelvin
 363  * Or < 0 if something fails.
 364  */
 365 static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
 366 {
 367         int temp;
 368
 369         temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
 370         if (temp < 0) {
 371                 dev_err(di->dev, "error reading temperature\n");
 372                 return temp;
 373         }
 374
 375         if (!bq27xxx_is_chip_version_higher(di))
 376                 temp = 5 * temp / 2;
 377
 378         return temp;
 379 }
 380
 381 /*
 382  * Return the battery Cycle count total
 383  * Or < 0 if something fails.
 384  */
 385 static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
 386 {
 387         int cyct;
 388
 389         if (di->chip == BQ27510)
 390                 cyct = bq27x00_read(di, BQ27510_REG_CYCT, false);
 391         else
 392                 cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
 393         if (cyct < 0)
 394                 dev_err(di->dev, "error reading cycle count total\n");
 395
 396         return cyct;
 397 }
 398
 399 /*
 400  * Read a time register.
 401  * Return < 0 if something fails.
 402  */
 403 static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
 404 {
 405         int tval;
 406
 407         tval = bq27x00_read(di, reg, false);
 408         if (tval < 0) {
 409                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 410                         reg, tval);
 411                 return tval;
 412         }
 413
 414         if (tval == 65535)
 415                 return -ENODATA;
 416
 417         return tval * 60;
 418 }
 419
 420 /*
 421  * Read a power avg register.
 422  * Return < 0 if something fails.
 423  */
 424 static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
 425 {
 426         int tval;
 427
 428         tval = bq27x00_read(di, reg, false);
 429         if (tval < 0) {
 430                 dev_err(di->dev, "error reading power avg rgister  %02x: %d\n",
 431                         reg, tval);
 432                 return tval;
 433         }
 434
 435         if (di->chip == BQ27500)
 436                 return tval;
 437         else
 438                 return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
 439 }
 440
 441 /*
 442  * Read flag register.
 443  * Return < 0 if something fails.
 444  */
 445 static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
 446 {
 447         int tval;
 448
 449         tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 450         if (tval < 0) {
 451                 dev_err(di->dev, "error reading flag register:%d\n", tval);
 452                 return tval;
 453         }
 454
 455         if (di->chip == BQ27500) {
 456                 if (tval & BQ27500_FLAG_SOCF)
 457                         tval = POWER_SUPPLY_HEALTH_DEAD;
 458                 else if (tval & BQ27500_FLAG_OTC)
 459                         tval = POWER_SUPPLY_HEALTH_OVERHEAT;
 460                 else
 461                         tval = POWER_SUPPLY_HEALTH_GOOD;
 462                 return tval;
 463         } else if (di->chip == BQ27510) {
 464                 if (tval & BQ27500_FLAG_OTC)
 465                         return POWER_SUPPLY_HEALTH_OVERHEAT;
 466                 return POWER_SUPPLY_HEALTH_GOOD;
 467         } else {
 468                 if (tval & BQ27000_FLAG_EDV1)
 469                         tval = POWER_SUPPLY_HEALTH_DEAD;
 470                 else
 471                         tval = POWER_SUPPLY_HEALTH_GOOD;
 472                 return tval;
 473         }
 474
 475         return -1;
 476 }
 477
 478 static void bq27x00_update(struct bq27x00_device_info *di)
 479 {
 480         struct bq27x00_reg_cache cache = {0, };
 481         bool is_bq27500 = di->chip == BQ27500;
 482         bool is_bq27510 = di->chip == BQ27510;
 483         bool is_bq27425 = di->chip == BQ27425;
 484         bool is_bq27742 = di->chip == BQ27742;
 485         bool flags_1b = !(is_bq27500 || is_bq27742);
 486
 487         cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, flags_1b);
 488         if ((cache.flags & 0xff) == 0xff)
 489                 /* read error */
 490                 cache.flags = -1;
 491         if (cache.flags >= 0) {
 492                 if (!is_bq27500 && !is_bq27425 && !is_bq27742 && !is_bq27510
 493                                 && (cache.flags & BQ27000_FLAG_CI)) {
 494                         dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
 495                         cache.capacity = -ENODATA;
 496                         cache.energy = -ENODATA;
 497                         cache.time_to_empty = -ENODATA;
 498                         cache.time_to_empty_avg = -ENODATA;
 499                         cache.time_to_full = -ENODATA;
 500                         cache.charge_full = -ENODATA;
 501                         cache.health = -ENODATA;
 502                 } else {
 503                         cache.capacity = bq27x00_battery_read_rsoc(di);
 504                         if (is_bq27742 || is_bq27510)
 505                                 cache.time_to_empty =
 506                                         bq27x00_battery_read_time(di,
 507                                                         BQ27x00_REG_TTE);
 508                         else if (!is_bq27425) {
 509                                 cache.energy = bq27x00_battery_read_energy(di);
 510                                 cache.time_to_empty =
 511                                         bq27x00_battery_read_time(di,
 512                                                         BQ27x00_REG_TTE);
 513                                 cache.time_to_empty_avg =
 514                                         bq27x00_battery_read_time(di,
 515                                                         BQ27x00_REG_TTECP);
 516                                 cache.time_to_full =
 517                                         bq27x00_battery_read_time(di,
 518                                                         BQ27x00_REG_TTF);
 519                         }
 520                         cache.charge_full = bq27x00_battery_read_lmd(di);
 521                         cache.health = bq27x00_battery_read_health(di);
 522                 }
 523                 cache.temperature = bq27x00_battery_read_temperature(di);
 524                 if (!is_bq27425)
 525                         cache.cycle_count = bq27x00_battery_read_cyct(di);
 526                 if (is_bq27742)
 527                         cache.power_avg =
 528                                 bq27x00_battery_read_pwr_avg(di,
 529                                                 BQ27742_POWER_AVG);
 530                 else
 531                         cache.power_avg =
 532                                 bq27x00_battery_read_pwr_avg(di,
 533                                                 BQ27x00_POWER_AVG);
 534
 535                 /* We only have to read charge design full once */
 536                 if (di->charge_design_full <= 0)
 537                         di->charge_design_full = bq27x00_battery_read_ilmd(di);
 538         }
 539
 540         if (di->cache.capacity != cache.capacity)
 541                 power_supply_changed(di->bat);
 542
 543         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 544                 di->cache = cache;
 545
 546         di->last_update = jiffies;
 547 }
 548
 549 static void bq27x00_battery_poll(struct work_struct *work)
 550 {
 551         struct bq27x00_device_info *di =
 552                 container_of(work, struct bq27x00_device_info, work.work);
 553
 554         bq27x00_update(di);
 555
 556         if (poll_interval > 0) {
 557                 /* The timer does not have to be accurate. */
 558                 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
 559                 schedule_delayed_work(&di->work, poll_interval * HZ);
 560         }
 561 }
 562
 563 /*
 564  * Return the battery average current in µA
 565  * Note that current can be negative signed as well
 566  * Or 0 if something fails.
 567  */
 568 static int bq27x00_battery_current(struct bq27x00_device_info *di,
 569                                    union power_supply_propval *val)
 570 {
 571         int curr;
 572         int flags;
 573
 574         curr = bq27x00_read(di, BQ27x00_REG_AI, false);
 575         if (curr < 0) {
 576                 dev_err(di->dev, "error reading current\n");
 577                 return curr;
 578         }
 579
 580         if (bq27xxx_is_chip_version_higher(di)) {
 581                 /* bq27500 returns signed value */
 582                 val->intval = (int)((s16)curr) * 1000;
 583         } else {
 584                 flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
 585                 if (flags & BQ27000_FLAG_CHGS) {
 586                         dev_dbg(di->dev, "negative current!\n");
 587                         curr = -curr;
 588                 }
 589
 590                 val->intval = curr * 3570 / BQ27000_RS;
 591         }
 592
 593         return 0;
 594 }
 595
 596 static int bq27x00_battery_status(struct bq27x00_device_info *di,
 597                                   union power_supply_propval *val)
 598 {
 599         int status;
 600
 601         if (bq27xxx_is_chip_version_higher(di)) {
 602                 if (di->cache.flags & BQ27500_FLAG_FC)
 603                         status = POWER_SUPPLY_STATUS_FULL;
 604                 else if (di->cache.flags & BQ27500_FLAG_DSC)
 605                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 606                 else
 607                         status = POWER_SUPPLY_STATUS_CHARGING;
 608         } else {
 609                 if (di->cache.flags & BQ27000_FLAG_FC)
 610                         status = POWER_SUPPLY_STATUS_FULL;
 611                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 612                         status = POWER_SUPPLY_STATUS_CHARGING;
 613                 else if (power_supply_am_i_supplied(di->bat))
 614                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 615                 else
 616                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 617         }
 618
 619         val->intval = status;
 620
 621         return 0;
 622 }
 623
 624 static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
 625                                           union power_supply_propval *val)
 626 {
 627         int level;
 628
 629         if (bq27xxx_is_chip_version_higher(di)) {
 630                 if (di->cache.flags & BQ27500_FLAG_FC)
 631                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 632                 else if (di->cache.flags & BQ27500_FLAG_SOC1)
 633                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 634                 else if (di->cache.flags & BQ27500_FLAG_SOCF)
 635                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 636                 else
 637                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 638         } else {
 639                 if (di->cache.flags & BQ27000_FLAG_FC)
 640                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 641                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 642                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 643                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 644                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 645                 else
 646                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 647         }
 648
 649         val->intval = level;
 650
 651         return 0;
 652 }
 653
 654 /*
 655  * Return the battery Voltage in millivolts
 656  * Or < 0 if something fails.
 657  */
 658 static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
 659                                    union power_supply_propval *val)
 660 {
 661         int volt;
 662
 663         volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
 664         if (volt < 0) {
 665                 dev_err(di->dev, "error reading voltage\n");
 666                 return volt;
 667         }
 668
 669         val->intval = volt * 1000;
 670
 671         return 0;
 672 }
 673
 674 static int bq27x00_simple_value(int value,
 675                                 union power_supply_propval *val)
 676 {
 677         if (value < 0)
 678                 return value;
 679
 680         val->intval = value;
 681
 682         return 0;
 683 }
 684
 685 static int bq27x00_battery_get_property(struct power_supply *psy,
 686                                         enum power_supply_property psp,
 687                                         union power_supply_propval *val)
 688 {
 689         int ret = 0;
 690         struct bq27x00_device_info *di = power_supply_get_drvdata(psy);
 691
 692         mutex_lock(&di->lock);
 693         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 694                 cancel_delayed_work_sync(&di->work);
 695                 bq27x00_battery_poll(&di->work.work);
 696         }
 697         mutex_unlock(&di->lock);
 698
 699         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 700                 return -ENODEV;
 701
 702         switch (psp) {
 703         case POWER_SUPPLY_PROP_STATUS:
 704                 ret = bq27x00_battery_status(di, val);
 705                 break;
 706         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 707                 ret = bq27x00_battery_voltage(di, val);
 708                 break;
 709         case POWER_SUPPLY_PROP_PRESENT:
 710                 val->intval = di->cache.flags < 0 ? 0 : 1;
 711                 break;
 712         case POWER_SUPPLY_PROP_CURRENT_NOW:
 713                 ret = bq27x00_battery_current(di, val);
 714                 break;
 715         case POWER_SUPPLY_PROP_CAPACITY:
 716                 ret = bq27x00_simple_value(di->cache.capacity, val);
 717                 break;
 718         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 719                 ret = bq27x00_battery_capacity_level(di, val);
 720                 break;
 721         case POWER_SUPPLY_PROP_TEMP:
 722                 ret = bq27x00_simple_value(di->cache.temperature, val);
 723                 if (ret == 0)
 724                         val->intval -= 2731;
 725                 break;
 726         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 727                 ret = bq27x00_simple_value(di->cache.time_to_empty, val);
 728                 break;
 729         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 730                 ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
 731                 break;
 732         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 733                 ret = bq27x00_simple_value(di->cache.time_to_full, val);
 734                 break;
 735         case POWER_SUPPLY_PROP_TECHNOLOGY:
 736                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 737                 break;
 738         case POWER_SUPPLY_PROP_CHARGE_NOW:
 739                 ret = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
 740                 break;
 741         case POWER_SUPPLY_PROP_CHARGE_FULL:
 742                 ret = bq27x00_simple_value(di->cache.charge_full, val);
 743                 break;
 744         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 745                 ret = bq27x00_simple_value(di->charge_design_full, val);
 746                 break;
 747         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 748                 ret = bq27x00_simple_value(di->cache.cycle_count, val);
 749                 break;
 750         case POWER_SUPPLY_PROP_ENERGY_NOW:
 751                 ret = bq27x00_simple_value(di->cache.energy, val);
 752                 break;
 753         case POWER_SUPPLY_PROP_POWER_AVG:
 754                 ret = bq27x00_simple_value(di->cache.power_avg, val);
 755                 break;
 756         case POWER_SUPPLY_PROP_HEALTH:
 757                 ret = bq27x00_simple_value(di->cache.health, val);
 758                 break;
 759         case POWER_SUPPLY_PROP_MANUFACTURER:
 760                 val->strval = BQ27XXX_MANUFACTURER;
 761                 break;
 762         default:
 763                 return -EINVAL;
 764         }
 765
 766         return ret;
 767 }
 768
 769 static void bq27x00_external_power_changed(struct power_supply *psy)
 770 {
 771         struct bq27x00_device_info *di = power_supply_get_drvdata(psy);
 772
 773         cancel_delayed_work_sync(&di->work);
 774         schedule_delayed_work(&di->work, 0);
 775 }
 776
 777 static int bq27x00_powersupply_init(struct bq27x00_device_info *di,
 778                                     const char *name)
 779 {
 780         int ret;
 781         struct power_supply_desc *psy_desc;
 782         struct power_supply_config psy_cfg = { .drv_data = di, };
 783
 784         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
 785         if (!psy_desc)
 786                 return -ENOMEM;
 787
 788         psy_desc->name = name;
 789         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
 790         if (di->chip == BQ27425) {
 791                 psy_desc->properties = bq27425_battery_props;
 792                 psy_desc->num_properties = ARRAY_SIZE(bq27425_battery_props);
 793         } else if (di->chip == BQ27742) {
 794                 psy_desc->properties = bq27742_battery_props;
 795                 psy_desc->num_properties = ARRAY_SIZE(bq27742_battery_props);
 796         } else if (di->chip == BQ27510) {
 797                 psy_desc->properties = bq27510_battery_props;
 798                 psy_desc->num_properties = ARRAY_SIZE(bq27510_battery_props);
 799         } else {
 800                 psy_desc->properties = bq27x00_battery_props;
 801                 psy_desc->num_properties = ARRAY_SIZE(bq27x00_battery_props);
 802         }
 803         psy_desc->get_property = bq27x00_battery_get_property;
 804         psy_desc->external_power_changed = bq27x00_external_power_changed;
 805
 806         INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
 807         mutex_init(&di->lock);
 808
 809         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
 810         if (IS_ERR(di->bat)) {
 811                 ret = PTR_ERR(di->bat);
 812                 dev_err(di->dev, "failed to register battery: %d\n", ret);
 813                 return ret;
 814         }
 815
 816         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 817
 818         bq27x00_update(di);
 819
 820         return 0;
 821 }
 822
 823 static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
 824 {
 825         /*
 826          * power_supply_unregister call bq27x00_battery_get_property which
 827          * call bq27x00_battery_poll.
 828          * Make sure that bq27x00_battery_poll will not call
 829          * schedule_delayed_work again after unregister (which cause OOPS).
 830          */
 831         poll_interval = 0;
 832
 833         cancel_delayed_work_sync(&di->work);
 834
 835         power_supply_unregister(di->bat);
 836
 837         mutex_destroy(&di->lock);
 838 }
 839
 840 /* i2c specific code */
 841 #ifdef CONFIG_BATTERY_BQ27X00_I2C
 842
 843 /* If the system has several batteries we need a different name for each
 844  * of them...
 845  */
 846 static DEFINE_IDR(battery_id);
 847 static DEFINE_MUTEX(battery_mutex);
 848
 849 static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
 850 {
 851         struct i2c_client *client = to_i2c_client(di->dev);
 852         struct i2c_msg msg[2];
 853         unsigned char data[2];
 854         int ret;
 855
 856         if (!client->adapter)
 857                 return -ENODEV;
 858
 859         msg[0].addr = client->addr;
 860         msg[0].flags = 0;
 861         msg[0].buf = &reg;
 862         msg[0].len = sizeof(reg);
 863         msg[1].addr = client->addr;
 864         msg[1].flags = I2C_M_RD;
 865         msg[1].buf = data;
 866         if (single)
 867                 msg[1].len = 1;
 868         else
 869                 msg[1].len = 2;
 870
 871         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
 872         if (ret < 0)
 873                 return ret;
 874
 875         if (!single)
 876                 ret = get_unaligned_le16(data);
 877         else
 878                 ret = data[0];
 879
 880         return ret;
 881 }
 882
 883 static int bq27x00_battery_probe(struct i2c_client *client,
 884                                  const struct i2c_device_id *id)
 885 {
 886         char *name;
 887         struct bq27x00_device_info *di;
 888         int num;
 889         int retval = 0;
 890
 891         /* Get new ID for the new battery device */
 892         mutex_lock(&battery_mutex);
 893         num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
 894         mutex_unlock(&battery_mutex);
 895         if (num < 0)
 896                 return num;
 897
 898         name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
 899         if (!name) {
 900                 retval = -ENOMEM;
 901                 goto batt_failed;
 902         }
 903
 904         di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
 905         if (!di) {
 906                 retval = -ENOMEM;
 907                 goto batt_failed;
 908         }
 909
 910         di->id = num;
 911         di->dev = &client->dev;
 912         di->chip = id->driver_data;
 913         di->bus.read = &bq27x00_read_i2c;
 914
 915         retval = bq27x00_powersupply_init(di, name);
 916         if (retval)
 917                 goto batt_failed;
 918
 919         i2c_set_clientdata(client, di);
 920
 921         return 0;
 922
 923 batt_failed:
 924         mutex_lock(&battery_mutex);
 925         idr_remove(&battery_id, num);
 926         mutex_unlock(&battery_mutex);
 927
 928         return retval;
 929 }
 930
 931 static int bq27x00_battery_remove(struct i2c_client *client)
 932 {
 933         struct bq27x00_device_info *di = i2c_get_clientdata(client);
 934
 935         bq27x00_powersupply_unregister(di);
 936
 937         mutex_lock(&battery_mutex);
 938         idr_remove(&battery_id, di->id);
 939         mutex_unlock(&battery_mutex);
 940
 941         return 0;
 942 }
 943
 944 static const struct i2c_device_id bq27x00_id[] = {
 945         { "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
 946         { "bq27500", BQ27500 },
 947         { "bq27425", BQ27425 },
 948         { "bq27742", BQ27742 },
 949         { "bq27510", BQ27510 },
 950         {},
 951 };
 952 MODULE_DEVICE_TABLE(i2c, bq27x00_id);
 953
 954 static struct i2c_driver bq27x00_battery_driver = {
 955         .driver = {
 956                 .name = "bq27x00-battery",
 957         },
 958         .probe = bq27x00_battery_probe,
 959         .remove = bq27x00_battery_remove,
 960         .id_table = bq27x00_id,
 961 };
 962
 963 static inline int bq27x00_battery_i2c_init(void)
 964 {
 965         int ret = i2c_add_driver(&bq27x00_battery_driver);
 966
 967         if (ret)
 968                 pr_err("Unable to register BQ27x00 i2c driver\n");
 969
 970         return ret;
 971 }
 972
 973 static inline void bq27x00_battery_i2c_exit(void)
 974 {
 975         i2c_del_driver(&bq27x00_battery_driver);
 976 }
 977
 978 #else
 979
 980 static inline int bq27x00_battery_i2c_init(void) { return 0; }
 981 static inline void bq27x00_battery_i2c_exit(void) {};
 982
 983 #endif
 984
 985 /* platform specific code */
 986 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
 987
 988 static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
 989                                  bool single)
 990 {
 991         struct device *dev = di->dev;
 992         struct bq27000_platform_data *pdata = dev->platform_data;
 993         unsigned int timeout = 3;
 994         int upper, lower;
 995         int temp;
 996
 997         if (!single) {
 998                 /* Make sure the value has not changed in between reading the
 999                  * lower and the upper part */
1000                 upper = pdata->read(dev, reg + 1);
1001                 do {
1002                         temp = upper;
1003                         if (upper < 0)
1004                                 return upper;
1005
1006                         lower = pdata->read(dev, reg);
1007                         if (lower < 0)
1008                                 return lower;
1009
1010                         upper = pdata->read(dev, reg + 1);
1011                 } while (temp != upper && --timeout);
1012
1013                 if (timeout == 0)
1014                         return -EIO;
1015
1016                 return (upper << 8) | lower;
1017         }
1018
1019         return pdata->read(dev, reg);
1020 }
1021
1022 static int bq27000_battery_probe(struct platform_device *pdev)
1023 {
1024         struct bq27x00_device_info *di;
1025         struct bq27000_platform_data *pdata = pdev->dev.platform_data;
1026         const char *name;
1027
1028         if (!pdata) {
1029                 dev_err(&pdev->dev, "no platform_data supplied\n");
1030                 return -EINVAL;
1031         }
1032
1033         if (!pdata->read) {
1034                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1035                 return -EINVAL;
1036         }
1037
1038         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1039         if (!di)
1040                 return -ENOMEM;
1041
1042         platform_set_drvdata(pdev, di);
1043
1044         di->dev = &pdev->dev;
1045         di->chip = BQ27000;
1046
1047         name = pdata->name ?: dev_name(&pdev->dev);
1048         di->bus.read = &bq27000_read_platform;
1049
1050         return bq27x00_powersupply_init(di, name);
1051 }
1052
1053 static int bq27000_battery_remove(struct platform_device *pdev)
1054 {
1055         struct bq27x00_device_info *di = platform_get_drvdata(pdev);
1056
1057         bq27x00_powersupply_unregister(di);
1058
1059         return 0;
1060 }
1061
1062 static struct platform_driver bq27000_battery_driver = {
1063         .probe  = bq27000_battery_probe,
1064         .remove = bq27000_battery_remove,
1065         .driver = {
1066                 .name = "bq27000-battery",
1067         },
1068 };
1069
1070 static inline int bq27x00_battery_platform_init(void)
1071 {
1072         int ret = platform_driver_register(&bq27000_battery_driver);
1073
1074         if (ret)
1075                 pr_err("Unable to register BQ27000 platform driver\n");
1076
1077         return ret;
1078 }
1079
1080 static inline void bq27x00_battery_platform_exit(void)
1081 {
1082         platform_driver_unregister(&bq27000_battery_driver);
1083 }
1084
1085 #else
1086
1087 static inline int bq27x00_battery_platform_init(void) { return 0; }
1088 static inline void bq27x00_battery_platform_exit(void) {};
1089
1090 #endif
1091
1092 /*
1093  * Module stuff
1094  */
1095
1096 static int __init bq27x00_battery_init(void)
1097 {
1098         int ret;
1099
1100         ret = bq27x00_battery_i2c_init();
1101         if (ret)
1102                 return ret;
1103
1104         ret = bq27x00_battery_platform_init();
1105         if (ret)
1106                 bq27x00_battery_i2c_exit();
1107
1108         return ret;
1109 }
1110 module_init(bq27x00_battery_init);
1111
1112 static void __exit bq27x00_battery_exit(void)
1113 {
1114         bq27x00_battery_platform_exit();
1115         bq27x00_battery_i2c_exit();
1116 }
1117 module_exit(bq27x00_battery_exit);
1118
1119 #ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
1120 MODULE_ALIAS("platform:bq27000-battery");
1121 #endif
1122
1123 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1124 MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
1125 MODULE_LICENSE("GPL");