drivers/power/bq27xxx_battery.c

   1 /*
   2  * BQ27xxx 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://www.ti.com/product/bq27000
  21  * http://www.ti.com/product/bq27200
  22  * http://www.ti.com/product/bq27010
  23  * http://www.ti.com/product/bq27210
  24  * http://www.ti.com/product/bq27500
  25  * http://www.ti.com/product/bq27510-g3
  26  * http://www.ti.com/product/bq27520-g4
  27  * http://www.ti.com/product/bq27530-g1
  28  * http://www.ti.com/product/bq27531-g1
  29  * http://www.ti.com/product/bq27541-g1
  30  * http://www.ti.com/product/bq27542-g1
  31  * http://www.ti.com/product/bq27546-g1
  32  * http://www.ti.com/product/bq27742-g1
  33  * http://www.ti.com/product/bq27545-g1
  34  * http://www.ti.com/product/bq27421-g1
  35  * http://www.ti.com/product/bq27425-g1
  36  * http://www.ti.com/product/bq27411-g1
  37  * http://www.ti.com/product/bq27621-g1
  38  */
  39
  40 #include <linux/device.h>
  41 #include <linux/module.h>
  42 #include <linux/param.h>
  43 #include <linux/jiffies.h>
  44 #include <linux/workqueue.h>
  45 #include <linux/delay.h>
  46 #include <linux/platform_device.h>
  47 #include <linux/power_supply.h>
  48 #include <linux/slab.h>
  49 #include <linux/of.h>
  50
  51 #include <linux/power/bq27xxx_battery.h>
  52
  53 #define DRIVER_VERSION          "1.2.0"
  54
  55 #define BQ27XXX_MANUFACTURER    "Texas Instruments"
  56
  57 /* BQ27XXX Flags */
  58 #define BQ27XXX_FLAG_DSC        BIT(0)
  59 #define BQ27XXX_FLAG_SOCF       BIT(1) /* State-of-Charge threshold final */
  60 #define BQ27XXX_FLAG_SOC1       BIT(2) /* State-of-Charge threshold 1 */
  61 #define BQ27XXX_FLAG_FC         BIT(9)
  62 #define BQ27XXX_FLAG_OTD        BIT(14)
  63 #define BQ27XXX_FLAG_OTC        BIT(15)
  64 #define BQ27XXX_FLAG_UT         BIT(14)
  65 #define BQ27XXX_FLAG_OT         BIT(15)
  66
  67 /* BQ27000 has different layout for Flags register */
  68 #define BQ27000_FLAG_EDVF       BIT(0) /* Final End-of-Discharge-Voltage flag */
  69 #define BQ27000_FLAG_EDV1       BIT(1) /* First End-of-Discharge-Voltage flag */
  70 #define BQ27000_FLAG_CI         BIT(4) /* Capacity Inaccurate flag */
  71 #define BQ27000_FLAG_FC         BIT(5)
  72 #define BQ27000_FLAG_CHGS       BIT(7) /* Charge state flag */
  73
  74 #define BQ27XXX_RS                      (20) /* Resistor sense mOhm */
  75 #define BQ27XXX_POWER_CONSTANT          (29200) /* 29.2 µV^2 * 1000 */
  76 #define BQ27XXX_CURRENT_CONSTANT        (3570) /* 3.57 µV * 1000 */
  77
  78 #define INVALID_REG_ADDR        0xff
  79
  80 /*
  81  * bq27xxx_reg_index - Register names
  82  *
  83  * These are indexes into a device's register mapping array.
  84  */
  85 enum bq27xxx_reg_index {
  86         BQ27XXX_REG_CTRL = 0,   /* Control */
  87         BQ27XXX_REG_TEMP,       /* Temperature */
  88         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
  89         BQ27XXX_REG_VOLT,       /* Voltage */
  90         BQ27XXX_REG_AI,         /* Average Current */
  91         BQ27XXX_REG_FLAGS,      /* Flags */
  92         BQ27XXX_REG_TTE,        /* Time-to-Empty */
  93         BQ27XXX_REG_TTF,        /* Time-to-Full */
  94         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
  95         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
  96         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
  97         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
  98         BQ27XXX_REG_CYCT,       /* Cycle Count */
  99         BQ27XXX_REG_AE,         /* Available Energy */
 100         BQ27XXX_REG_SOC,        /* State-of-Charge */
 101         BQ27XXX_REG_DCAP,       /* Design Capacity */
 102         BQ27XXX_REG_AP,         /* Average Power */
 103 };
 104
 105 /* Register mappings */
 106 static u8 bq27000_regs[] = {
 107         0x00,   /* CONTROL      */
 108         0x06,   /* TEMP         */
 109         INVALID_REG_ADDR,       /* INT TEMP - NA*/
 110         0x08,   /* VOLT         */
 111         0x14,   /* AVG CURR     */
 112         0x0a,   /* FLAGS        */
 113         0x16,   /* TTE          */
 114         0x18,   /* TTF          */
 115         0x1c,   /* TTES         */
 116         0x26,   /* TTECP        */
 117         0x0c,   /* NAC          */
 118         0x12,   /* LMD(FCC)     */
 119         0x2a,   /* CYCT         */
 120         0x22,   /* AE           */
 121         0x0b,   /* SOC(RSOC)    */
 122         0x76,   /* DCAP(ILMD)   */
 123         0x24,   /* AP           */
 124 };
 125
 126 static u8 bq27010_regs[] = {
 127         0x00,   /* CONTROL      */
 128         0x06,   /* TEMP         */
 129         INVALID_REG_ADDR,       /* INT TEMP - NA*/
 130         0x08,   /* VOLT         */
 131         0x14,   /* AVG CURR     */
 132         0x0a,   /* FLAGS        */
 133         0x16,   /* TTE          */
 134         0x18,   /* TTF          */
 135         0x1c,   /* TTES         */
 136         0x26,   /* TTECP        */
 137         0x0c,   /* NAC          */
 138         0x12,   /* LMD(FCC)     */
 139         0x2a,   /* CYCT         */
 140         INVALID_REG_ADDR,       /* AE - NA      */
 141         0x0b,   /* SOC(RSOC)    */
 142         0x76,   /* DCAP(ILMD)   */
 143         INVALID_REG_ADDR,       /* AP - NA      */
 144 };
 145
 146 static u8 bq27500_regs[] = {
 147         0x00,   /* CONTROL      */
 148         0x06,   /* TEMP         */
 149         0x28,   /* INT TEMP     */
 150         0x08,   /* VOLT         */
 151         0x14,   /* AVG CURR     */
 152         0x0a,   /* FLAGS        */
 153         0x16,   /* TTE          */
 154         INVALID_REG_ADDR,       /* TTF - NA     */
 155         0x1a,   /* TTES         */
 156         INVALID_REG_ADDR,       /* TTECP - NA   */
 157         0x0c,   /* NAC          */
 158         0x12,   /* LMD(FCC)     */
 159         0x2a,   /* CYCT         */
 160         INVALID_REG_ADDR,       /* AE - NA      */
 161         0x2c,   /* SOC(RSOC)    */
 162         0x3c,   /* DCAP(ILMD)   */
 163         INVALID_REG_ADDR,       /* AP - NA      */
 164 };
 165
 166 static u8 bq27530_regs[] = {
 167         0x00,   /* CONTROL      */
 168         0x06,   /* TEMP         */
 169         0x32,   /* INT TEMP     */
 170         0x08,   /* VOLT         */
 171         0x14,   /* AVG CURR     */
 172         0x0a,   /* FLAGS        */
 173         0x16,   /* TTE          */
 174         INVALID_REG_ADDR,       /* TTF - NA     */
 175         INVALID_REG_ADDR,       /* TTES - NA    */
 176         INVALID_REG_ADDR,       /* TTECP - NA   */
 177         0x0c,   /* NAC          */
 178         0x12,   /* LMD(FCC)     */
 179         0x2a,   /* CYCT         */
 180         INVALID_REG_ADDR,       /* AE - NA      */
 181         0x2c,   /* SOC(RSOC)    */
 182         INVALID_REG_ADDR,       /* DCAP - NA    */
 183         0x24,   /* AP           */
 184 };
 185
 186 static u8 bq27541_regs[] = {
 187         0x00,   /* CONTROL      */
 188         0x06,   /* TEMP         */
 189         0x28,   /* INT TEMP     */
 190         0x08,   /* VOLT         */
 191         0x14,   /* AVG CURR     */
 192         0x0a,   /* FLAGS        */
 193         0x16,   /* TTE          */
 194         INVALID_REG_ADDR,       /* TTF - NA     */
 195         INVALID_REG_ADDR,       /* TTES - NA    */
 196         INVALID_REG_ADDR,       /* TTECP - NA   */
 197         0x0c,   /* NAC          */
 198         0x12,   /* LMD(FCC)     */
 199         0x2a,   /* CYCT         */
 200         INVALID_REG_ADDR,       /* AE - NA      */
 201         0x2c,   /* SOC(RSOC)    */
 202         0x3c,   /* DCAP         */
 203         0x24,   /* AP           */
 204 };
 205
 206 static u8 bq27545_regs[] = {
 207         0x00,   /* CONTROL      */
 208         0x06,   /* TEMP         */
 209         0x28,   /* INT TEMP     */
 210         0x08,   /* VOLT         */
 211         0x14,   /* AVG CURR     */
 212         0x0a,   /* FLAGS        */
 213         0x16,   /* TTE          */
 214         INVALID_REG_ADDR,       /* TTF - NA     */
 215         INVALID_REG_ADDR,       /* TTES - NA    */
 216         INVALID_REG_ADDR,       /* TTECP - NA   */
 217         0x0c,   /* NAC          */
 218         0x12,   /* LMD(FCC)     */
 219         0x2a,   /* CYCT         */
 220         INVALID_REG_ADDR,       /* AE - NA      */
 221         0x2c,   /* SOC(RSOC)    */
 222         INVALID_REG_ADDR,       /* DCAP - NA */
 223         0x24,   /* AP           */
 224 };
 225
 226 static u8 bq27421_regs[] = {
 227         0x00,   /* CONTROL      */
 228         0x02,   /* TEMP         */
 229         0x1e,   /* INT TEMP     */
 230         0x04,   /* VOLT         */
 231         0x10,   /* AVG CURR     */
 232         0x06,   /* FLAGS        */
 233         INVALID_REG_ADDR,       /* TTE - NA     */
 234         INVALID_REG_ADDR,       /* TTF - NA     */
 235         INVALID_REG_ADDR,       /* TTES - NA    */
 236         INVALID_REG_ADDR,       /* TTECP - NA   */
 237         0x08,   /* NAC          */
 238         0x0e,   /* FCC          */
 239         INVALID_REG_ADDR,       /* CYCT - NA    */
 240         INVALID_REG_ADDR,       /* AE - NA      */
 241         0x1c,   /* SOC          */
 242         0x3c,   /* DCAP         */
 243         0x18,   /* AP           */
 244 };
 245
 246 static u8 *bq27xxx_regs[] = {
 247         [BQ27000] = bq27000_regs,
 248         [BQ27010] = bq27010_regs,
 249         [BQ27500] = bq27500_regs,
 250         [BQ27530] = bq27530_regs,
 251         [BQ27541] = bq27541_regs,
 252         [BQ27545] = bq27545_regs,
 253         [BQ27421] = bq27421_regs,
 254 };
 255
 256 static enum power_supply_property bq27000_battery_props[] = {
 257         POWER_SUPPLY_PROP_STATUS,
 258         POWER_SUPPLY_PROP_PRESENT,
 259         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 260         POWER_SUPPLY_PROP_CURRENT_NOW,
 261         POWER_SUPPLY_PROP_CAPACITY,
 262         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 263         POWER_SUPPLY_PROP_TEMP,
 264         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 265         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 266         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 267         POWER_SUPPLY_PROP_TECHNOLOGY,
 268         POWER_SUPPLY_PROP_CHARGE_FULL,
 269         POWER_SUPPLY_PROP_CHARGE_NOW,
 270         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 271         POWER_SUPPLY_PROP_CYCLE_COUNT,
 272         POWER_SUPPLY_PROP_ENERGY_NOW,
 273         POWER_SUPPLY_PROP_POWER_AVG,
 274         POWER_SUPPLY_PROP_HEALTH,
 275         POWER_SUPPLY_PROP_MANUFACTURER,
 276 };
 277
 278 static enum power_supply_property bq27010_battery_props[] = {
 279         POWER_SUPPLY_PROP_STATUS,
 280         POWER_SUPPLY_PROP_PRESENT,
 281         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 282         POWER_SUPPLY_PROP_CURRENT_NOW,
 283         POWER_SUPPLY_PROP_CAPACITY,
 284         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 285         POWER_SUPPLY_PROP_TEMP,
 286         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 287         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 288         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 289         POWER_SUPPLY_PROP_TECHNOLOGY,
 290         POWER_SUPPLY_PROP_CHARGE_FULL,
 291         POWER_SUPPLY_PROP_CHARGE_NOW,
 292         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 293         POWER_SUPPLY_PROP_CYCLE_COUNT,
 294         POWER_SUPPLY_PROP_HEALTH,
 295         POWER_SUPPLY_PROP_MANUFACTURER,
 296 };
 297
 298 static enum power_supply_property bq27500_battery_props[] = {
 299         POWER_SUPPLY_PROP_STATUS,
 300         POWER_SUPPLY_PROP_PRESENT,
 301         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 302         POWER_SUPPLY_PROP_CURRENT_NOW,
 303         POWER_SUPPLY_PROP_CAPACITY,
 304         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 305         POWER_SUPPLY_PROP_TEMP,
 306         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 307         POWER_SUPPLY_PROP_TECHNOLOGY,
 308         POWER_SUPPLY_PROP_CHARGE_FULL,
 309         POWER_SUPPLY_PROP_CHARGE_NOW,
 310         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 311         POWER_SUPPLY_PROP_CYCLE_COUNT,
 312         POWER_SUPPLY_PROP_HEALTH,
 313         POWER_SUPPLY_PROP_MANUFACTURER,
 314 };
 315
 316 static enum power_supply_property bq27530_battery_props[] = {
 317         POWER_SUPPLY_PROP_STATUS,
 318         POWER_SUPPLY_PROP_PRESENT,
 319         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 320         POWER_SUPPLY_PROP_CURRENT_NOW,
 321         POWER_SUPPLY_PROP_CAPACITY,
 322         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 323         POWER_SUPPLY_PROP_TEMP,
 324         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 325         POWER_SUPPLY_PROP_TECHNOLOGY,
 326         POWER_SUPPLY_PROP_CHARGE_FULL,
 327         POWER_SUPPLY_PROP_CHARGE_NOW,
 328         POWER_SUPPLY_PROP_POWER_AVG,
 329         POWER_SUPPLY_PROP_HEALTH,
 330         POWER_SUPPLY_PROP_CYCLE_COUNT,
 331         POWER_SUPPLY_PROP_MANUFACTURER,
 332 };
 333
 334 static enum power_supply_property bq27541_battery_props[] = {
 335         POWER_SUPPLY_PROP_STATUS,
 336         POWER_SUPPLY_PROP_PRESENT,
 337         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 338         POWER_SUPPLY_PROP_CURRENT_NOW,
 339         POWER_SUPPLY_PROP_CAPACITY,
 340         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 341         POWER_SUPPLY_PROP_TEMP,
 342         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 343         POWER_SUPPLY_PROP_TECHNOLOGY,
 344         POWER_SUPPLY_PROP_CHARGE_FULL,
 345         POWER_SUPPLY_PROP_CHARGE_NOW,
 346         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 347         POWER_SUPPLY_PROP_CYCLE_COUNT,
 348         POWER_SUPPLY_PROP_POWER_AVG,
 349         POWER_SUPPLY_PROP_HEALTH,
 350         POWER_SUPPLY_PROP_MANUFACTURER,
 351 };
 352
 353 static enum power_supply_property bq27545_battery_props[] = {
 354         POWER_SUPPLY_PROP_STATUS,
 355         POWER_SUPPLY_PROP_PRESENT,
 356         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 357         POWER_SUPPLY_PROP_CURRENT_NOW,
 358         POWER_SUPPLY_PROP_CAPACITY,
 359         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 360         POWER_SUPPLY_PROP_TEMP,
 361         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 362         POWER_SUPPLY_PROP_TECHNOLOGY,
 363         POWER_SUPPLY_PROP_CHARGE_FULL,
 364         POWER_SUPPLY_PROP_CHARGE_NOW,
 365         POWER_SUPPLY_PROP_HEALTH,
 366         POWER_SUPPLY_PROP_CYCLE_COUNT,
 367         POWER_SUPPLY_PROP_POWER_AVG,
 368         POWER_SUPPLY_PROP_MANUFACTURER,
 369 };
 370
 371 static enum power_supply_property bq27421_battery_props[] = {
 372         POWER_SUPPLY_PROP_STATUS,
 373         POWER_SUPPLY_PROP_PRESENT,
 374         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 375         POWER_SUPPLY_PROP_CURRENT_NOW,
 376         POWER_SUPPLY_PROP_CAPACITY,
 377         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 378         POWER_SUPPLY_PROP_TEMP,
 379         POWER_SUPPLY_PROP_TECHNOLOGY,
 380         POWER_SUPPLY_PROP_CHARGE_FULL,
 381         POWER_SUPPLY_PROP_CHARGE_NOW,
 382         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 383         POWER_SUPPLY_PROP_MANUFACTURER,
 384 };
 385
 386 #define BQ27XXX_PROP(_id, _prop)                \
 387         [_id] = {                               \
 388                 .props = _prop,                 \
 389                 .size = ARRAY_SIZE(_prop),      \
 390         }
 391
 392 static struct {
 393         enum power_supply_property *props;
 394         size_t size;
 395 } bq27xxx_battery_props[] = {
 396         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
 397         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
 398         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
 399         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
 400         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
 401         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
 402         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
 403 };
 404
 405 static unsigned int poll_interval = 360;
 406 module_param(poll_interval, uint, 0644);
 407 MODULE_PARM_DESC(poll_interval,
 408                  "battery poll interval in seconds - 0 disables polling");
 409
 410 /*
 411  * Common code for BQ27xxx devices
 412  */
 413
 414 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 415                                bool single)
 416 {
 417         /* Reports EINVAL for invalid/missing registers */
 418         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 419                 return -EINVAL;
 420
 421         return di->bus.read(di, di->regs[reg_index], single);
 422 }
 423
 424 /*
 425  * Return the battery State-of-Charge
 426  * Or < 0 if something fails.
 427  */
 428 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 429 {
 430         int soc;
 431
 432         if (di->chip == BQ27000 || di->chip == BQ27010)
 433                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
 434         else
 435                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 436
 437         if (soc < 0)
 438                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 439
 440         return soc;
 441 }
 442
 443 /*
 444  * Return a battery charge value in µAh
 445  * Or < 0 if something fails.
 446  */
 447 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 448 {
 449         int charge;
 450
 451         charge = bq27xxx_read(di, reg, false);
 452         if (charge < 0) {
 453                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 454                         reg, charge);
 455                 return charge;
 456         }
 457
 458         if (di->chip == BQ27000 || di->chip == BQ27010)
 459                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 460         else
 461                 charge *= 1000;
 462
 463         return charge;
 464 }
 465
 466 /*
 467  * Return the battery Nominal available capacity in µAh
 468  * Or < 0 if something fails.
 469  */
 470 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 471 {
 472         int flags;
 473
 474         if (di->chip == BQ27000 || di->chip == BQ27010) {
 475                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 476                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 477                         return -ENODATA;
 478         }
 479
 480         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 481 }
 482
 483 /*
 484  * Return the battery Full Charge Capacity in µAh
 485  * Or < 0 if something fails.
 486  */
 487 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 488 {
 489         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 490 }
 491
 492 /*
 493  * Return the Design Capacity in µAh
 494  * Or < 0 if something fails.
 495  */
 496 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 497 {
 498         int dcap;
 499
 500         if (di->chip == BQ27000 || di->chip == BQ27010)
 501                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
 502         else
 503                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 504
 505         if (dcap < 0) {
 506                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 507                 return dcap;
 508         }
 509
 510         if (di->chip == BQ27000 || di->chip == BQ27010)
 511                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 512         else
 513                 dcap *= 1000;
 514
 515         return dcap;
 516 }
 517
 518 /*
 519  * Return the battery Available energy in µWh
 520  * Or < 0 if something fails.
 521  */
 522 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 523 {
 524         int ae;
 525
 526         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 527         if (ae < 0) {
 528                 dev_dbg(di->dev, "error reading available energy\n");
 529                 return ae;
 530         }
 531
 532         if (di->chip == BQ27000 || di->chip == BQ27010)
 533                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 534         else
 535                 ae *= 1000;
 536
 537         return ae;
 538 }
 539
 540 /*
 541  * Return the battery temperature in tenths of degree Kelvin
 542  * Or < 0 if something fails.
 543  */
 544 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 545 {
 546         int temp;
 547
 548         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 549         if (temp < 0) {
 550                 dev_err(di->dev, "error reading temperature\n");
 551                 return temp;
 552         }
 553
 554         if (di->chip == BQ27000 || di->chip == BQ27010)
 555                 temp = 5 * temp / 2;
 556
 557         return temp;
 558 }
 559
 560 /*
 561  * Return the battery Cycle count total
 562  * Or < 0 if something fails.
 563  */
 564 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 565 {
 566         int cyct;
 567
 568         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 569         if (cyct < 0)
 570                 dev_err(di->dev, "error reading cycle count total\n");
 571
 572         return cyct;
 573 }
 574
 575 /*
 576  * Read a time register.
 577  * Return < 0 if something fails.
 578  */
 579 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 580 {
 581         int tval;
 582
 583         tval = bq27xxx_read(di, reg, false);
 584         if (tval < 0) {
 585                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 586                         reg, tval);
 587                 return tval;
 588         }
 589
 590         if (tval == 65535)
 591                 return -ENODATA;
 592
 593         return tval * 60;
 594 }
 595
 596 /*
 597  * Read an average power register.
 598  * Return < 0 if something fails.
 599  */
 600 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 601 {
 602         int tval;
 603
 604         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 605         if (tval < 0) {
 606                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 607                         BQ27XXX_REG_AP, tval);
 608                 return tval;
 609         }
 610
 611         if (di->chip == BQ27000 || di->chip == BQ27010)
 612                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 613         else
 614                 return tval;
 615 }
 616
 617 /*
 618  * Returns true if a battery over temperature condition is detected
 619  */
 620 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
 621 {
 622         if (di->chip == BQ27500 || di->chip == BQ27541 || di->chip == BQ27545)
 623                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 624         if (di->chip == BQ27530 || di->chip == BQ27421)
 625                 return flags & BQ27XXX_FLAG_OT;
 626
 627         return false;
 628 }
 629
 630 /*
 631  * Returns true if a battery under temperature condition is detected
 632  */
 633 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
 634 {
 635         if (di->chip == BQ27530 || di->chip == BQ27421)
 636                 return flags & BQ27XXX_FLAG_UT;
 637
 638         return false;
 639 }
 640
 641 /*
 642  * Returns true if a low state of charge condition is detected
 643  */
 644 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
 645 {
 646         if (di->chip == BQ27000 || di->chip == BQ27010)
 647                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
 648         else
 649                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
 650 }
 651
 652 /*
 653  * Read flag register.
 654  * Return < 0 if something fails.
 655  */
 656 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
 657 {
 658         int flags;
 659
 660         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
 661         if (flags < 0) {
 662                 dev_err(di->dev, "error reading flag register:%d\n", flags);
 663                 return flags;
 664         }
 665
 666         /* Unlikely but important to return first */
 667         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
 668                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 669         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
 670                 return POWER_SUPPLY_HEALTH_COLD;
 671         if (unlikely(bq27xxx_battery_dead(di, flags)))
 672                 return POWER_SUPPLY_HEALTH_DEAD;
 673
 674         return POWER_SUPPLY_HEALTH_GOOD;
 675 }
 676
 677 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
 678 {
 679         struct bq27xxx_reg_cache cache = {0, };
 680         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
 681         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 682
 683         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 684         if ((cache.flags & 0xff) == 0xff)
 685                 cache.flags = -1; /* read error */
 686         if (cache.flags >= 0) {
 687                 cache.temperature = bq27xxx_battery_read_temperature(di);
 688                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
 689                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
 690                         cache.capacity = -ENODATA;
 691                         cache.energy = -ENODATA;
 692                         cache.time_to_empty = -ENODATA;
 693                         cache.time_to_empty_avg = -ENODATA;
 694                         cache.time_to_full = -ENODATA;
 695                         cache.charge_full = -ENODATA;
 696                         cache.health = -ENODATA;
 697                 } else {
 698                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
 699                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
 700                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
 701                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
 702                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
 703                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
 704                         cache.charge_full = bq27xxx_battery_read_fcc(di);
 705                         cache.capacity = bq27xxx_battery_read_soc(di);
 706                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
 707                                 cache.energy = bq27xxx_battery_read_energy(di);
 708                         cache.health = bq27xxx_battery_read_health(di);
 709                 }
 710                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
 711                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
 712                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
 713                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
 714
 715                 /* We only have to read charge design full once */
 716                 if (di->charge_design_full <= 0)
 717                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
 718         }
 719
 720         if (di->cache.capacity != cache.capacity)
 721                 power_supply_changed(di->bat);
 722
 723         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 724                 di->cache = cache;
 725
 726         di->last_update = jiffies;
 727 }
 728 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
 729
 730 static void bq27xxx_battery_poll(struct work_struct *work)
 731 {
 732         struct bq27xxx_device_info *di =
 733                         container_of(work, struct bq27xxx_device_info,
 734                                      work.work);
 735
 736         bq27xxx_battery_update(di);
 737
 738         if (poll_interval > 0)
 739                 schedule_delayed_work(&di->work, poll_interval * HZ);
 740 }
 741
 742 /*
 743  * Return the battery average current in µA
 744  * Note that current can be negative signed as well
 745  * Or 0 if something fails.
 746  */
 747 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
 748                                    union power_supply_propval *val)
 749 {
 750         int curr;
 751         int flags;
 752
 753         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
 754         if (curr < 0) {
 755                 dev_err(di->dev, "error reading current\n");
 756                 return curr;
 757         }
 758
 759         if (di->chip == BQ27000 || di->chip == BQ27010) {
 760                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
 761                 if (flags & BQ27000_FLAG_CHGS) {
 762                         dev_dbg(di->dev, "negative current!\n");
 763                         curr = -curr;
 764                 }
 765
 766                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 767         } else {
 768                 /* Other gauges return signed value */
 769                 val->intval = (int)((s16)curr) * 1000;
 770         }
 771
 772         return 0;
 773 }
 774
 775 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
 776                                   union power_supply_propval *val)
 777 {
 778         int status;
 779
 780         if (di->chip == BQ27000 || di->chip == BQ27010) {
 781                 if (di->cache.flags & BQ27000_FLAG_FC)
 782                         status = POWER_SUPPLY_STATUS_FULL;
 783                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 784                         status = POWER_SUPPLY_STATUS_CHARGING;
 785                 else if (power_supply_am_i_supplied(di->bat))
 786                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 787                 else
 788                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 789         } else {
 790                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 791                         status = POWER_SUPPLY_STATUS_FULL;
 792                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
 793                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 794                 else
 795                         status = POWER_SUPPLY_STATUS_CHARGING;
 796         }
 797
 798         val->intval = status;
 799
 800         return 0;
 801 }
 802
 803 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
 804                                           union power_supply_propval *val)
 805 {
 806         int level;
 807
 808         if (di->chip == BQ27000 || di->chip == BQ27010) {
 809                 if (di->cache.flags & BQ27000_FLAG_FC)
 810                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 811                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 812                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 813                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 814                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 815                 else
 816                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 817         } else {
 818                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 819                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 820                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
 821                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 822                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
 823                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 824                 else
 825                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 826         }
 827
 828         val->intval = level;
 829
 830         return 0;
 831 }
 832
 833 /*
 834  * Return the battery Voltage in millivolts
 835  * Or < 0 if something fails.
 836  */
 837 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
 838                                    union power_supply_propval *val)
 839 {
 840         int volt;
 841
 842         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
 843         if (volt < 0) {
 844                 dev_err(di->dev, "error reading voltage\n");
 845                 return volt;
 846         }
 847
 848         val->intval = volt * 1000;
 849
 850         return 0;
 851 }
 852
 853 static int bq27xxx_simple_value(int value,
 854                                 union power_supply_propval *val)
 855 {
 856         if (value < 0)
 857                 return value;
 858
 859         val->intval = value;
 860
 861         return 0;
 862 }
 863
 864 static int bq27xxx_battery_get_property(struct power_supply *psy,
 865                                         enum power_supply_property psp,
 866                                         union power_supply_propval *val)
 867 {
 868         int ret = 0;
 869         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
 870
 871         mutex_lock(&di->lock);
 872         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 873                 cancel_delayed_work_sync(&di->work);
 874                 bq27xxx_battery_poll(&di->work.work);
 875         }
 876         mutex_unlock(&di->lock);
 877
 878         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 879                 return -ENODEV;
 880
 881         switch (psp) {
 882         case POWER_SUPPLY_PROP_STATUS:
 883                 ret = bq27xxx_battery_status(di, val);
 884                 break;
 885         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 886                 ret = bq27xxx_battery_voltage(di, val);
 887                 break;
 888         case POWER_SUPPLY_PROP_PRESENT:
 889                 val->intval = di->cache.flags < 0 ? 0 : 1;
 890                 break;
 891         case POWER_SUPPLY_PROP_CURRENT_NOW:
 892                 ret = bq27xxx_battery_current(di, val);
 893                 break;
 894         case POWER_SUPPLY_PROP_CAPACITY:
 895                 ret = bq27xxx_simple_value(di->cache.capacity, val);
 896                 break;
 897         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 898                 ret = bq27xxx_battery_capacity_level(di, val);
 899                 break;
 900         case POWER_SUPPLY_PROP_TEMP:
 901                 ret = bq27xxx_simple_value(di->cache.temperature, val);
 902                 if (ret == 0)
 903                         val->intval -= 2731; /* convert decidegree k to c */
 904                 break;
 905         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 906                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
 907                 break;
 908         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 909                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
 910                 break;
 911         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 912                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
 913                 break;
 914         case POWER_SUPPLY_PROP_TECHNOLOGY:
 915                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 916                 break;
 917         case POWER_SUPPLY_PROP_CHARGE_NOW:
 918                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
 919                 break;
 920         case POWER_SUPPLY_PROP_CHARGE_FULL:
 921                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
 922                 break;
 923         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 924                 ret = bq27xxx_simple_value(di->charge_design_full, val);
 925                 break;
 926         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 927                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
 928                 break;
 929         case POWER_SUPPLY_PROP_ENERGY_NOW:
 930                 ret = bq27xxx_simple_value(di->cache.energy, val);
 931                 break;
 932         case POWER_SUPPLY_PROP_POWER_AVG:
 933                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
 934                 break;
 935         case POWER_SUPPLY_PROP_HEALTH:
 936                 ret = bq27xxx_simple_value(di->cache.health, val);
 937                 break;
 938         case POWER_SUPPLY_PROP_MANUFACTURER:
 939                 val->strval = BQ27XXX_MANUFACTURER;
 940                 break;
 941         default:
 942                 return -EINVAL;
 943         }
 944
 945         return ret;
 946 }
 947
 948 static void bq27xxx_external_power_changed(struct power_supply *psy)
 949 {
 950         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
 951
 952         cancel_delayed_work_sync(&di->work);
 953         schedule_delayed_work(&di->work, 0);
 954 }
 955
 956 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
 957 {
 958         struct power_supply_desc *psy_desc;
 959         struct power_supply_config psy_cfg = { .drv_data = di, };
 960
 961         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
 962         mutex_init(&di->lock);
 963         di->regs = bq27xxx_regs[di->chip];
 964
 965         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
 966         if (!psy_desc)
 967                 return -ENOMEM;
 968
 969         psy_desc->name = di->name;
 970         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
 971         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
 972         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
 973         psy_desc->get_property = bq27xxx_battery_get_property;
 974         psy_desc->external_power_changed = bq27xxx_external_power_changed;
 975
 976         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
 977         if (IS_ERR(di->bat)) {
 978                 dev_err(di->dev, "failed to register battery\n");
 979                 return PTR_ERR(di->bat);
 980         }
 981
 982         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 983
 984         bq27xxx_battery_update(di);
 985
 986         return 0;
 987 }
 988 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
 989
 990 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
 991 {
 992         /*
 993          * power_supply_unregister call bq27xxx_battery_get_property which
 994          * call bq27xxx_battery_poll.
 995          * Make sure that bq27xxx_battery_poll will not call
 996          * schedule_delayed_work again after unregister (which cause OOPS).
 997          */
 998         poll_interval = 0;
 999
1000         cancel_delayed_work_sync(&di->work);
1001
1002         power_supply_unregister(di->bat);
1003
1004         mutex_destroy(&di->lock);
1005 }
1006 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1007
1008 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1009                                          bool single)
1010 {
1011         struct device *dev = di->dev;
1012         struct bq27xxx_platform_data *pdata = dev->platform_data;
1013         unsigned int timeout = 3;
1014         int upper, lower;
1015         int temp;
1016
1017         if (!single) {
1018                 /* Make sure the value has not changed in between reading the
1019                  * lower and the upper part */
1020                 upper = pdata->read(dev, reg + 1);
1021                 do {
1022                         temp = upper;
1023                         if (upper < 0)
1024                                 return upper;
1025
1026                         lower = pdata->read(dev, reg);
1027                         if (lower < 0)
1028                                 return lower;
1029
1030                         upper = pdata->read(dev, reg + 1);
1031                 } while (temp != upper && --timeout);
1032
1033                 if (timeout == 0)
1034                         return -EIO;
1035
1036                 return (upper << 8) | lower;
1037         }
1038
1039         return pdata->read(dev, reg);
1040 }
1041
1042 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1043 {
1044         struct bq27xxx_device_info *di;
1045         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1046
1047         if (!pdata) {
1048                 dev_err(&pdev->dev, "no platform_data supplied\n");
1049                 return -EINVAL;
1050         }
1051
1052         if (!pdata->read) {
1053                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1054                 return -EINVAL;
1055         }
1056
1057         if (!pdata->chip) {
1058                 dev_err(&pdev->dev, "no device supplied\n");
1059                 return -EINVAL;
1060         }
1061
1062         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1063         if (!di)
1064                 return -ENOMEM;
1065
1066         platform_set_drvdata(pdev, di);
1067
1068         di->dev = &pdev->dev;
1069         di->chip = pdata->chip;
1070         di->name = pdata->name ?: dev_name(&pdev->dev);
1071         di->bus.read = bq27xxx_battery_platform_read;
1072
1073         return bq27xxx_battery_setup(di);
1074 }
1075
1076 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1077 {
1078         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1079
1080         bq27xxx_battery_teardown(di);
1081
1082         return 0;
1083 }
1084
1085 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1086         { "bq27000-battery", },
1087         { /* sentinel */ }
1088 };
1089 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1090
1091 #ifdef CONFIG_OF
1092 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1093         { .compatible = "ti,bq27000" },
1094         {},
1095 };
1096 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1097 #endif
1098
1099 static struct platform_driver bq27xxx_battery_platform_driver = {
1100         .probe  = bq27xxx_battery_platform_probe,
1101         .remove = bq27xxx_battery_platform_remove,
1102         .driver = {
1103                 .name = "bq27000-battery",
1104                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1105         },
1106         .id_table = bq27xxx_battery_platform_id_table,
1107 };
1108 module_platform_driver(bq27xxx_battery_platform_driver);
1109
1110 MODULE_ALIAS("platform:bq27000-battery");
1111
1112 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1113 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1114 MODULE_LICENSE("GPL");