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