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/idr.h>
  49 #include <linux/i2c.h>
  50 #include <linux/slab.h>
  51 #include <linux/interrupt.h>
  52 #include <asm/unaligned.h>
  53
  54 #include <linux/power/bq27xxx_battery.h>
  55
  56 #define DRIVER_VERSION          "1.2.0"
  57
  58 #define BQ27XXX_MANUFACTURER    "Texas Instruments"
  59
  60 /* BQ27XXX Flags */
  61 #define BQ27XXX_FLAG_DSC        BIT(0)
  62 #define BQ27XXX_FLAG_SOCF       BIT(1) /* State-of-Charge threshold final */
  63 #define BQ27XXX_FLAG_SOC1       BIT(2) /* State-of-Charge threshold 1 */
  64 #define BQ27XXX_FLAG_FC         BIT(9)
  65 #define BQ27XXX_FLAG_OTD        BIT(14)
  66 #define BQ27XXX_FLAG_OTC        BIT(15)
  67 #define BQ27XXX_FLAG_UT         BIT(14)
  68 #define BQ27XXX_FLAG_OT         BIT(15)
  69
  70 /* BQ27000 has different layout for Flags register */
  71 #define BQ27000_FLAG_EDVF       BIT(0) /* Final End-of-Discharge-Voltage flag */
  72 #define BQ27000_FLAG_EDV1       BIT(1) /* First End-of-Discharge-Voltage flag */
  73 #define BQ27000_FLAG_CI         BIT(4) /* Capacity Inaccurate flag */
  74 #define BQ27000_FLAG_FC         BIT(5)
  75 #define BQ27000_FLAG_CHGS       BIT(7) /* Charge state flag */
  76
  77 #define BQ27XXX_RS                      (20) /* Resistor sense mOhm */
  78 #define BQ27XXX_POWER_CONSTANT          (29200) /* 29.2 µV^2 * 1000 */
  79 #define BQ27XXX_CURRENT_CONSTANT        (3570) /* 3.57 µV * 1000 */
  80
  81 struct bq27xxx_device_info;
  82 struct bq27xxx_access_methods {
  83         int (*read)(struct bq27xxx_device_info *di, u8 reg, bool single);
  84 };
  85
  86 #define INVALID_REG_ADDR        0xff
  87
  88 /*
  89  * bq27xxx_reg_index - Register names
  90  *
  91  * These are indexes into a device's register mapping array.
  92  */
  93 enum bq27xxx_reg_index {
  94         BQ27XXX_REG_CTRL = 0,   /* Control */
  95         BQ27XXX_REG_TEMP,       /* Temperature */
  96         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
  97         BQ27XXX_REG_VOLT,       /* Voltage */
  98         BQ27XXX_REG_AI,         /* Average Current */
  99         BQ27XXX_REG_FLAGS,      /* Flags */
 100         BQ27XXX_REG_TTE,        /* Time-to-Empty */
 101         BQ27XXX_REG_TTF,        /* Time-to-Full */
 102         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
 103         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
 104         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
 105         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
 106         BQ27XXX_REG_CYCT,       /* Cycle Count */
 107         BQ27XXX_REG_AE,         /* Available Energy */
 108         BQ27XXX_REG_SOC,        /* State-of-Charge */
 109         BQ27XXX_REG_DCAP,       /* Design Capacity */
 110         BQ27XXX_REG_AP,         /* Average Power */
 111 };
 112
 113 struct bq27xxx_reg_cache {
 114         int temperature;
 115         int time_to_empty;
 116         int time_to_empty_avg;
 117         int time_to_full;
 118         int charge_full;
 119         int cycle_count;
 120         int capacity;
 121         int energy;
 122         int flags;
 123         int power_avg;
 124         int health;
 125 };
 126
 127 struct bq27xxx_device_info {
 128         struct device           *dev;
 129         int                     id;
 130         enum bq27xxx_chip       chip;
 131
 132         struct bq27xxx_reg_cache cache;
 133         int charge_design_full;
 134
 135         unsigned long last_update;
 136         struct delayed_work work;
 137
 138         struct power_supply     *bat;
 139
 140         struct bq27xxx_access_methods bus;
 141
 142         struct mutex lock;
 143
 144         u8 *regs;
 145 };
 146
 147 /* Register mappings */
 148 static u8 bq27000_regs[] = {
 149         0x00,   /* CONTROL      */
 150         0x06,   /* TEMP         */
 151         INVALID_REG_ADDR,       /* INT TEMP - NA*/
 152         0x08,   /* VOLT         */
 153         0x14,   /* AVG CURR     */
 154         0x0a,   /* FLAGS        */
 155         0x16,   /* TTE          */
 156         0x18,   /* TTF          */
 157         0x1c,   /* TTES         */
 158         0x26,   /* TTECP        */
 159         0x0c,   /* NAC          */
 160         0x12,   /* LMD(FCC)     */
 161         0x2a,   /* CYCT         */
 162         0x22,   /* AE           */
 163         0x0b,   /* SOC(RSOC)    */
 164         0x76,   /* DCAP(ILMD)   */
 165         0x24,   /* AP           */
 166 };
 167
 168 static u8 bq27010_regs[] = {
 169         0x00,   /* CONTROL      */
 170         0x06,   /* TEMP         */
 171         INVALID_REG_ADDR,       /* INT TEMP - NA*/
 172         0x08,   /* VOLT         */
 173         0x14,   /* AVG CURR     */
 174         0x0a,   /* FLAGS        */
 175         0x16,   /* TTE          */
 176         0x18,   /* TTF          */
 177         0x1c,   /* TTES         */
 178         0x26,   /* TTECP        */
 179         0x0c,   /* NAC          */
 180         0x12,   /* LMD(FCC)     */
 181         0x2a,   /* CYCT         */
 182         INVALID_REG_ADDR,       /* AE - NA      */
 183         0x0b,   /* SOC(RSOC)    */
 184         0x76,   /* DCAP(ILMD)   */
 185         INVALID_REG_ADDR,       /* AP - NA      */
 186 };
 187
 188 static u8 bq27500_regs[] = {
 189         0x00,   /* CONTROL      */
 190         0x06,   /* TEMP         */
 191         0x28,   /* INT TEMP     */
 192         0x08,   /* VOLT         */
 193         0x14,   /* AVG CURR     */
 194         0x0a,   /* FLAGS        */
 195         0x16,   /* TTE          */
 196         INVALID_REG_ADDR,       /* TTF - NA     */
 197         0x1a,   /* TTES         */
 198         INVALID_REG_ADDR,       /* TTECP - NA   */
 199         0x0c,   /* NAC          */
 200         0x12,   /* LMD(FCC)     */
 201         0x1e,   /* CYCT         */
 202         INVALID_REG_ADDR,       /* AE - NA      */
 203         0x20,   /* SOC(RSOC)    */
 204         0x2e,   /* DCAP(ILMD)   */
 205         INVALID_REG_ADDR,       /* AP - NA      */
 206 };
 207
 208 static u8 bq27530_regs[] = {
 209         0x00,   /* CONTROL      */
 210         0x06,   /* TEMP         */
 211         0x32,   /* INT TEMP     */
 212         0x08,   /* VOLT         */
 213         0x14,   /* AVG CURR     */
 214         0x0a,   /* FLAGS        */
 215         0x16,   /* TTE          */
 216         INVALID_REG_ADDR,       /* TTF - NA     */
 217         INVALID_REG_ADDR,       /* TTES - NA    */
 218         INVALID_REG_ADDR,       /* TTECP - NA   */
 219         0x0c,   /* NAC          */
 220         0x12,   /* LMD(FCC)     */
 221         0x2a,   /* CYCT         */
 222         INVALID_REG_ADDR,       /* AE - NA      */
 223         0x2c,   /* SOC(RSOC)    */
 224         INVALID_REG_ADDR,       /* DCAP - NA    */
 225         0x24,   /* AP           */
 226 };
 227
 228 static u8 bq27541_regs[] = {
 229         0x00,   /* CONTROL      */
 230         0x06,   /* TEMP         */
 231         0x28,   /* INT TEMP     */
 232         0x08,   /* VOLT         */
 233         0x14,   /* AVG CURR     */
 234         0x0a,   /* FLAGS        */
 235         0x16,   /* TTE          */
 236         INVALID_REG_ADDR,       /* TTF - NA     */
 237         INVALID_REG_ADDR,       /* TTES - NA    */
 238         INVALID_REG_ADDR,       /* TTECP - NA   */
 239         0x0c,   /* NAC          */
 240         0x12,   /* LMD(FCC)     */
 241         0x2a,   /* CYCT         */
 242         INVALID_REG_ADDR,       /* AE - NA      */
 243         0x2c,   /* SOC(RSOC)    */
 244         0x3c,   /* DCAP         */
 245         0x76,   /* AP           */
 246 };
 247
 248 static u8 bq27545_regs[] = {
 249         0x00,   /* CONTROL      */
 250         0x06,   /* TEMP         */
 251         0x28,   /* INT TEMP     */
 252         0x08,   /* VOLT         */
 253         0x14,   /* AVG CURR     */
 254         0x0a,   /* FLAGS        */
 255         0x16,   /* TTE          */
 256         INVALID_REG_ADDR,       /* TTF - NA     */
 257         INVALID_REG_ADDR,       /* TTES - NA    */
 258         INVALID_REG_ADDR,       /* TTECP - NA   */
 259         0x0c,   /* NAC          */
 260         0x12,   /* LMD(FCC)     */
 261         0x2a,   /* CYCT         */
 262         INVALID_REG_ADDR,       /* AE - NA      */
 263         0x2c,   /* SOC(RSOC)    */
 264         INVALID_REG_ADDR,       /* DCAP - NA */
 265         0x24,   /* AP           */
 266 };
 267
 268 static u8 bq27421_regs[] = {
 269         0x00,   /* CONTROL      */
 270         0x02,   /* TEMP         */
 271         0x1e,   /* INT TEMP     */
 272         0x04,   /* VOLT         */
 273         0x10,   /* AVG CURR     */
 274         0x06,   /* FLAGS        */
 275         INVALID_REG_ADDR,       /* TTE - NA     */
 276         INVALID_REG_ADDR,       /* TTF - NA     */
 277         INVALID_REG_ADDR,       /* TTES - NA    */
 278         INVALID_REG_ADDR,       /* TTECP - NA   */
 279         0x08,   /* NAC          */
 280         0x0e,   /* FCC          */
 281         INVALID_REG_ADDR,       /* CYCT - NA    */
 282         INVALID_REG_ADDR,       /* AE - NA      */
 283         0x1c,   /* SOC          */
 284         0x3c,   /* DCAP         */
 285         0x18,   /* AP           */
 286 };
 287
 288 static u8 *bq27xxx_regs[] = {
 289         [BQ27000] = bq27000_regs,
 290         [BQ27010] = bq27010_regs,
 291         [BQ27500] = bq27500_regs,
 292         [BQ27530] = bq27530_regs,
 293         [BQ27541] = bq27541_regs,
 294         [BQ27545] = bq27545_regs,
 295         [BQ27421] = bq27421_regs,
 296 };
 297
 298 static enum power_supply_property bq27000_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_TIME_TO_EMPTY_AVG,
 308         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 309         POWER_SUPPLY_PROP_TECHNOLOGY,
 310         POWER_SUPPLY_PROP_CHARGE_FULL,
 311         POWER_SUPPLY_PROP_CHARGE_NOW,
 312         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 313         POWER_SUPPLY_PROP_CYCLE_COUNT,
 314         POWER_SUPPLY_PROP_ENERGY_NOW,
 315         POWER_SUPPLY_PROP_POWER_AVG,
 316         POWER_SUPPLY_PROP_HEALTH,
 317         POWER_SUPPLY_PROP_MANUFACTURER,
 318 };
 319
 320 static enum power_supply_property bq27010_battery_props[] = {
 321         POWER_SUPPLY_PROP_STATUS,
 322         POWER_SUPPLY_PROP_PRESENT,
 323         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 324         POWER_SUPPLY_PROP_CURRENT_NOW,
 325         POWER_SUPPLY_PROP_CAPACITY,
 326         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 327         POWER_SUPPLY_PROP_TEMP,
 328         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 329         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 330         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 331         POWER_SUPPLY_PROP_TECHNOLOGY,
 332         POWER_SUPPLY_PROP_CHARGE_FULL,
 333         POWER_SUPPLY_PROP_CHARGE_NOW,
 334         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 335         POWER_SUPPLY_PROP_CYCLE_COUNT,
 336         POWER_SUPPLY_PROP_HEALTH,
 337         POWER_SUPPLY_PROP_MANUFACTURER,
 338 };
 339
 340 static enum power_supply_property bq27500_battery_props[] = {
 341         POWER_SUPPLY_PROP_STATUS,
 342         POWER_SUPPLY_PROP_PRESENT,
 343         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 344         POWER_SUPPLY_PROP_CURRENT_NOW,
 345         POWER_SUPPLY_PROP_CAPACITY,
 346         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 347         POWER_SUPPLY_PROP_TEMP,
 348         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 349         POWER_SUPPLY_PROP_TECHNOLOGY,
 350         POWER_SUPPLY_PROP_CHARGE_FULL,
 351         POWER_SUPPLY_PROP_CHARGE_NOW,
 352         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 353         POWER_SUPPLY_PROP_CYCLE_COUNT,
 354         POWER_SUPPLY_PROP_HEALTH,
 355         POWER_SUPPLY_PROP_MANUFACTURER,
 356 };
 357
 358 static enum power_supply_property bq27530_battery_props[] = {
 359         POWER_SUPPLY_PROP_STATUS,
 360         POWER_SUPPLY_PROP_PRESENT,
 361         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 362         POWER_SUPPLY_PROP_CURRENT_NOW,
 363         POWER_SUPPLY_PROP_CAPACITY,
 364         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 365         POWER_SUPPLY_PROP_TEMP,
 366         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 367         POWER_SUPPLY_PROP_TECHNOLOGY,
 368         POWER_SUPPLY_PROP_CHARGE_FULL,
 369         POWER_SUPPLY_PROP_CHARGE_NOW,
 370         POWER_SUPPLY_PROP_POWER_AVG,
 371         POWER_SUPPLY_PROP_HEALTH,
 372         POWER_SUPPLY_PROP_CYCLE_COUNT,
 373         POWER_SUPPLY_PROP_MANUFACTURER,
 374 };
 375
 376 static enum power_supply_property bq27541_battery_props[] = {
 377         POWER_SUPPLY_PROP_STATUS,
 378         POWER_SUPPLY_PROP_PRESENT,
 379         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 380         POWER_SUPPLY_PROP_CURRENT_NOW,
 381         POWER_SUPPLY_PROP_CAPACITY,
 382         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 383         POWER_SUPPLY_PROP_TEMP,
 384         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 385         POWER_SUPPLY_PROP_TECHNOLOGY,
 386         POWER_SUPPLY_PROP_CHARGE_FULL,
 387         POWER_SUPPLY_PROP_CHARGE_NOW,
 388         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 389         POWER_SUPPLY_PROP_CYCLE_COUNT,
 390         POWER_SUPPLY_PROP_POWER_AVG,
 391         POWER_SUPPLY_PROP_HEALTH,
 392         POWER_SUPPLY_PROP_MANUFACTURER,
 393 };
 394
 395 static enum power_supply_property bq27545_battery_props[] = {
 396         POWER_SUPPLY_PROP_STATUS,
 397         POWER_SUPPLY_PROP_PRESENT,
 398         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 399         POWER_SUPPLY_PROP_CURRENT_NOW,
 400         POWER_SUPPLY_PROP_CAPACITY,
 401         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 402         POWER_SUPPLY_PROP_TEMP,
 403         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 404         POWER_SUPPLY_PROP_TECHNOLOGY,
 405         POWER_SUPPLY_PROP_CHARGE_FULL,
 406         POWER_SUPPLY_PROP_CHARGE_NOW,
 407         POWER_SUPPLY_PROP_HEALTH,
 408         POWER_SUPPLY_PROP_CYCLE_COUNT,
 409         POWER_SUPPLY_PROP_POWER_AVG,
 410         POWER_SUPPLY_PROP_MANUFACTURER,
 411 };
 412
 413 static enum power_supply_property bq27421_battery_props[] = {
 414         POWER_SUPPLY_PROP_STATUS,
 415         POWER_SUPPLY_PROP_PRESENT,
 416         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 417         POWER_SUPPLY_PROP_CURRENT_NOW,
 418         POWER_SUPPLY_PROP_CAPACITY,
 419         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 420         POWER_SUPPLY_PROP_TEMP,
 421         POWER_SUPPLY_PROP_TECHNOLOGY,
 422         POWER_SUPPLY_PROP_CHARGE_FULL,
 423         POWER_SUPPLY_PROP_CHARGE_NOW,
 424         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 425         POWER_SUPPLY_PROP_MANUFACTURER,
 426 };
 427
 428 #define BQ27XXX_PROP(_id, _prop)                \
 429         [_id] = {                               \
 430                 .props = _prop,                 \
 431                 .size = ARRAY_SIZE(_prop),      \
 432         }
 433
 434 static struct {
 435         enum power_supply_property *props;
 436         size_t size;
 437 } bq27xxx_battery_props[] = {
 438         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
 439         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
 440         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
 441         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
 442         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
 443         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
 444         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
 445 };
 446
 447 static unsigned int poll_interval = 360;
 448 module_param(poll_interval, uint, 0644);
 449 MODULE_PARM_DESC(poll_interval,
 450                  "battery poll interval in seconds - 0 disables polling");
 451
 452 /*
 453  * Common code for BQ27xxx devices
 454  */
 455
 456 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 457                                bool single)
 458 {
 459         /* Reports EINVAL for invalid/missing registers */
 460         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 461                 return -EINVAL;
 462
 463         return di->bus.read(di, di->regs[reg_index], single);
 464 }
 465
 466 /*
 467  * Return the battery State-of-Charge
 468  * Or < 0 if something fails.
 469  */
 470 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 471 {
 472         int soc;
 473
 474         soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 475
 476         if (soc < 0)
 477                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 478
 479         return soc;
 480 }
 481
 482 /*
 483  * Return a battery charge value in µAh
 484  * Or < 0 if something fails.
 485  */
 486 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 487 {
 488         int charge;
 489
 490         charge = bq27xxx_read(di, reg, false);
 491         if (charge < 0) {
 492                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 493                         reg, charge);
 494                 return charge;
 495         }
 496
 497         if (di->chip == BQ27000 || di->chip == BQ27010)
 498                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 499         else
 500                 charge *= 1000;
 501
 502         return charge;
 503 }
 504
 505 /*
 506  * Return the battery Nominal available capacity in µAh
 507  * Or < 0 if something fails.
 508  */
 509 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 510 {
 511         int flags;
 512
 513         if (di->chip == BQ27000 || di->chip == BQ27010) {
 514                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 515                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 516                         return -ENODATA;
 517         }
 518
 519         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 520 }
 521
 522 /*
 523  * Return the battery Full Charge Capacity in µAh
 524  * Or < 0 if something fails.
 525  */
 526 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 527 {
 528         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 529 }
 530
 531 /*
 532  * Return the Design Capacity in µAh
 533  * Or < 0 if something fails.
 534  */
 535 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 536 {
 537         int dcap;
 538
 539         dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 540
 541         if (dcap < 0) {
 542                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 543                 return dcap;
 544         }
 545
 546         if (di->chip == BQ27000 || di->chip == BQ27010)
 547                 dcap *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 548         else
 549                 dcap *= 1000;
 550
 551         return dcap;
 552 }
 553
 554 /*
 555  * Return the battery Available energy in µWh
 556  * Or < 0 if something fails.
 557  */
 558 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 559 {
 560         int ae;
 561
 562         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 563         if (ae < 0) {
 564                 dev_dbg(di->dev, "error reading available energy\n");
 565                 return ae;
 566         }
 567
 568         if (di->chip == BQ27000 || di->chip == BQ27010)
 569                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 570         else
 571                 ae *= 1000;
 572
 573         return ae;
 574 }
 575
 576 /*
 577  * Return the battery temperature in tenths of degree Kelvin
 578  * Or < 0 if something fails.
 579  */
 580 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 581 {
 582         int temp;
 583
 584         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 585         if (temp < 0) {
 586                 dev_err(di->dev, "error reading temperature\n");
 587                 return temp;
 588         }
 589
 590         if (di->chip == BQ27000 || di->chip == BQ27010)
 591                 temp = 5 * temp / 2;
 592
 593         return temp;
 594 }
 595
 596 /*
 597  * Return the battery Cycle count total
 598  * Or < 0 if something fails.
 599  */
 600 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 601 {
 602         int cyct;
 603
 604         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 605         if (cyct < 0)
 606                 dev_err(di->dev, "error reading cycle count total\n");
 607
 608         return cyct;
 609 }
 610
 611 /*
 612  * Read a time register.
 613  * Return < 0 if something fails.
 614  */
 615 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 616 {
 617         int tval;
 618
 619         tval = bq27xxx_read(di, reg, false);
 620         if (tval < 0) {
 621                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 622                         reg, tval);
 623                 return tval;
 624         }
 625
 626         if (tval == 65535)
 627                 return -ENODATA;
 628
 629         return tval * 60;
 630 }
 631
 632 /*
 633  * Read an average power register.
 634  * Return < 0 if something fails.
 635  */
 636 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 637 {
 638         int tval;
 639
 640         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 641         if (tval < 0) {
 642                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 643                         BQ27XXX_REG_AP, tval);
 644                 return tval;
 645         }
 646
 647         if (di->chip == BQ27000 || di->chip == BQ27010)
 648                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 649         else
 650                 return tval;
 651 }
 652
 653 /*
 654  * Returns true if a battery over temperature condition is detected
 655  */
 656 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
 657 {
 658         if (di->chip == BQ27500 || di->chip == BQ27541 || di->chip == BQ27545)
 659                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 660         if (di->chip == BQ27530 || di->chip == BQ27421)
 661                 return flags & BQ27XXX_FLAG_OT;
 662
 663         return false;
 664 }
 665
 666 /*
 667  * Returns true if a battery under temperature condition is detected
 668  */
 669 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
 670 {
 671         if (di->chip == BQ27530 || di->chip == BQ27421)
 672                 return flags & BQ27XXX_FLAG_UT;
 673
 674         return false;
 675 }
 676
 677 /*
 678  * Returns true if a low state of charge condition is detected
 679  */
 680 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
 681 {
 682         if (di->chip == BQ27000 || di->chip == BQ27010)
 683                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
 684         else
 685                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
 686 }
 687
 688 /*
 689  * Read flag register.
 690  * Return < 0 if something fails.
 691  */
 692 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
 693 {
 694         u16 flags;
 695
 696         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
 697         if (flags < 0) {
 698                 dev_err(di->dev, "error reading flag register:%d\n", flags);
 699                 return flags;
 700         }
 701
 702         /* Unlikely but important to return first */
 703         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
 704                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 705         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
 706                 return POWER_SUPPLY_HEALTH_COLD;
 707         if (unlikely(bq27xxx_battery_dead(di, flags)))
 708                 return POWER_SUPPLY_HEALTH_DEAD;
 709
 710         return POWER_SUPPLY_HEALTH_GOOD;
 711 }
 712
 713 static void bq27xxx_battery_update(struct bq27xxx_device_info *di)
 714 {
 715         struct bq27xxx_reg_cache cache = {0, };
 716         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
 717         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 718
 719         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 720         if ((cache.flags & 0xff) == 0xff)
 721                 cache.flags = -1; /* read error */
 722         if (cache.flags >= 0) {
 723                 cache.temperature = bq27xxx_battery_read_temperature(di);
 724                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
 725                         dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
 726                         cache.capacity = -ENODATA;
 727                         cache.energy = -ENODATA;
 728                         cache.time_to_empty = -ENODATA;
 729                         cache.time_to_empty_avg = -ENODATA;
 730                         cache.time_to_full = -ENODATA;
 731                         cache.charge_full = -ENODATA;
 732                         cache.health = -ENODATA;
 733                 } else {
 734                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
 735                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
 736                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
 737                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
 738                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
 739                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
 740                         cache.charge_full = bq27xxx_battery_read_fcc(di);
 741                         cache.capacity = bq27xxx_battery_read_soc(di);
 742                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
 743                                 cache.energy = bq27xxx_battery_read_energy(di);
 744                         cache.health = bq27xxx_battery_read_health(di);
 745                 }
 746                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
 747                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
 748                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
 749                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
 750
 751                 /* We only have to read charge design full once */
 752                 if (di->charge_design_full <= 0)
 753                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
 754         }
 755
 756         if (di->cache.capacity != cache.capacity)
 757                 power_supply_changed(di->bat);
 758
 759         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 760                 di->cache = cache;
 761
 762         di->last_update = jiffies;
 763 }
 764
 765 static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
 766 {
 767         struct bq27xxx_device_info *di = data;
 768
 769         bq27xxx_battery_update(di);
 770
 771         return IRQ_HANDLED;
 772 }
 773
 774 static void bq27xxx_battery_poll(struct work_struct *work)
 775 {
 776         struct bq27xxx_device_info *di =
 777                         container_of(work, struct bq27xxx_device_info,
 778                                      work.work);
 779
 780         bq27xxx_battery_update(di);
 781
 782         if (poll_interval > 0) {
 783                 /* The timer does not have to be accurate. */
 784                 set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
 785                 schedule_delayed_work(&di->work, poll_interval * HZ);
 786         }
 787 }
 788
 789 /*
 790  * Return the battery average current in µA
 791  * Note that current can be negative signed as well
 792  * Or 0 if something fails.
 793  */
 794 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
 795                                    union power_supply_propval *val)
 796 {
 797         int curr;
 798         int flags;
 799
 800         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
 801         if (curr < 0) {
 802                 dev_err(di->dev, "error reading current\n");
 803                 return curr;
 804         }
 805
 806         if (di->chip == BQ27000 || di->chip == BQ27010) {
 807                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
 808                 if (flags & BQ27000_FLAG_CHGS) {
 809                         dev_dbg(di->dev, "negative current!\n");
 810                         curr = -curr;
 811                 }
 812
 813                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 814         } else {
 815                 /* Other gauges return signed value */
 816                 val->intval = (int)((s16)curr) * 1000;
 817         }
 818
 819         return 0;
 820 }
 821
 822 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
 823                                   union power_supply_propval *val)
 824 {
 825         int status;
 826
 827         if (di->chip == BQ27000 || di->chip == BQ27010) {
 828                 if (di->cache.flags & BQ27000_FLAG_FC)
 829                         status = POWER_SUPPLY_STATUS_FULL;
 830                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 831                         status = POWER_SUPPLY_STATUS_CHARGING;
 832                 else if (power_supply_am_i_supplied(di->bat))
 833                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 834                 else
 835                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 836         } else {
 837                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 838                         status = POWER_SUPPLY_STATUS_FULL;
 839                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
 840                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 841                 else
 842                         status = POWER_SUPPLY_STATUS_CHARGING;
 843         }
 844
 845         val->intval = status;
 846
 847         return 0;
 848 }
 849
 850 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
 851                                           union power_supply_propval *val)
 852 {
 853         int level;
 854
 855         if (di->chip == BQ27000 || di->chip == BQ27010) {
 856                 if (di->cache.flags & BQ27000_FLAG_FC)
 857                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 858                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 859                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 860                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 861                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 862                 else
 863                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 864         } else {
 865                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 866                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 867                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
 868                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 869                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
 870                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 871                 else
 872                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 873         }
 874
 875         val->intval = level;
 876
 877         return 0;
 878 }
 879
 880 /*
 881  * Return the battery Voltage in millivolts
 882  * Or < 0 if something fails.
 883  */
 884 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
 885                                    union power_supply_propval *val)
 886 {
 887         int volt;
 888
 889         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
 890         if (volt < 0) {
 891                 dev_err(di->dev, "error reading voltage\n");
 892                 return volt;
 893         }
 894
 895         val->intval = volt * 1000;
 896
 897         return 0;
 898 }
 899
 900 static int bq27xxx_simple_value(int value,
 901                                 union power_supply_propval *val)
 902 {
 903         if (value < 0)
 904                 return value;
 905
 906         val->intval = value;
 907
 908         return 0;
 909 }
 910
 911 static int bq27xxx_battery_get_property(struct power_supply *psy,
 912                                         enum power_supply_property psp,
 913                                         union power_supply_propval *val)
 914 {
 915         int ret = 0;
 916         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
 917
 918         mutex_lock(&di->lock);
 919         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 920                 cancel_delayed_work_sync(&di->work);
 921                 bq27xxx_battery_poll(&di->work.work);
 922         }
 923         mutex_unlock(&di->lock);
 924
 925         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 926                 return -ENODEV;
 927
 928         switch (psp) {
 929         case POWER_SUPPLY_PROP_STATUS:
 930                 ret = bq27xxx_battery_status(di, val);
 931                 break;
 932         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 933                 ret = bq27xxx_battery_voltage(di, val);
 934                 break;
 935         case POWER_SUPPLY_PROP_PRESENT:
 936                 val->intval = di->cache.flags < 0 ? 0 : 1;
 937                 break;
 938         case POWER_SUPPLY_PROP_CURRENT_NOW:
 939                 ret = bq27xxx_battery_current(di, val);
 940                 break;
 941         case POWER_SUPPLY_PROP_CAPACITY:
 942                 ret = bq27xxx_simple_value(di->cache.capacity, val);
 943                 break;
 944         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 945                 ret = bq27xxx_battery_capacity_level(di, val);
 946                 break;
 947         case POWER_SUPPLY_PROP_TEMP:
 948                 ret = bq27xxx_simple_value(di->cache.temperature, val);
 949                 if (ret == 0)
 950                         val->intval -= 2731; /* convert decidegree k to c */
 951                 break;
 952         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 953                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
 954                 break;
 955         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 956                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
 957                 break;
 958         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 959                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
 960                 break;
 961         case POWER_SUPPLY_PROP_TECHNOLOGY:
 962                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 963                 break;
 964         case POWER_SUPPLY_PROP_CHARGE_NOW:
 965                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
 966                 break;
 967         case POWER_SUPPLY_PROP_CHARGE_FULL:
 968                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
 969                 break;
 970         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 971                 ret = bq27xxx_simple_value(di->charge_design_full, val);
 972                 break;
 973         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 974                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
 975                 break;
 976         case POWER_SUPPLY_PROP_ENERGY_NOW:
 977                 ret = bq27xxx_simple_value(di->cache.energy, val);
 978                 break;
 979         case POWER_SUPPLY_PROP_POWER_AVG:
 980                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
 981                 break;
 982         case POWER_SUPPLY_PROP_HEALTH:
 983                 ret = bq27xxx_simple_value(di->cache.health, val);
 984                 break;
 985         case POWER_SUPPLY_PROP_MANUFACTURER:
 986                 val->strval = BQ27XXX_MANUFACTURER;
 987                 break;
 988         default:
 989                 return -EINVAL;
 990         }
 991
 992         return ret;
 993 }
 994
 995 static void bq27xxx_external_power_changed(struct power_supply *psy)
 996 {
 997         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
 998
 999         cancel_delayed_work_sync(&di->work);
1000         schedule_delayed_work(&di->work, 0);
1001 }
1002
1003 static int bq27xxx_powersupply_init(struct bq27xxx_device_info *di,
1004                                     const char *name)
1005 {
1006         int ret;
1007         struct power_supply_desc *psy_desc;
1008         struct power_supply_config psy_cfg = { .drv_data = di, };
1009
1010         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1011         if (!psy_desc)
1012                 return -ENOMEM;
1013
1014         psy_desc->name = name;
1015         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1016         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
1017         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
1018         psy_desc->get_property = bq27xxx_battery_get_property;
1019         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1020
1021         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1022         mutex_init(&di->lock);
1023
1024         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1025         if (IS_ERR(di->bat)) {
1026                 ret = PTR_ERR(di->bat);
1027                 dev_err(di->dev, "failed to register battery: %d\n", ret);
1028                 return ret;
1029         }
1030
1031         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1032
1033         bq27xxx_battery_update(di);
1034
1035         return 0;
1036 }
1037
1038 static void bq27xxx_powersupply_unregister(struct bq27xxx_device_info *di)
1039 {
1040         /*
1041          * power_supply_unregister call bq27xxx_battery_get_property which
1042          * call bq27xxx_battery_poll.
1043          * Make sure that bq27xxx_battery_poll will not call
1044          * schedule_delayed_work again after unregister (which cause OOPS).
1045          */
1046         poll_interval = 0;
1047
1048         cancel_delayed_work_sync(&di->work);
1049
1050         power_supply_unregister(di->bat);
1051
1052         mutex_destroy(&di->lock);
1053 }
1054
1055 /* i2c specific code */
1056 #ifdef CONFIG_BATTERY_BQ27XXX_I2C
1057
1058 /* If the system has several batteries we need a different name for each
1059  * of them...
1060  */
1061 static DEFINE_IDR(battery_id);
1062 static DEFINE_MUTEX(battery_mutex);
1063
1064 static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
1065                                     bool single)
1066 {
1067         struct i2c_client *client = to_i2c_client(di->dev);
1068         struct i2c_msg msg[2];
1069         unsigned char data[2];
1070         int ret;
1071
1072         if (!client->adapter)
1073                 return -ENODEV;
1074
1075         msg[0].addr = client->addr;
1076         msg[0].flags = 0;
1077         msg[0].buf = &reg;
1078         msg[0].len = sizeof(reg);
1079         msg[1].addr = client->addr;
1080         msg[1].flags = I2C_M_RD;
1081         msg[1].buf = data;
1082         if (single)
1083                 msg[1].len = 1;
1084         else
1085                 msg[1].len = 2;
1086
1087         ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
1088         if (ret < 0)
1089                 return ret;
1090
1091         if (!single)
1092                 ret = get_unaligned_le16(data);
1093         else
1094                 ret = data[0];
1095
1096         return ret;
1097 }
1098
1099 static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
1100                                      const struct i2c_device_id *id)
1101 {
1102         char *name;
1103         struct bq27xxx_device_info *di;
1104         int num;
1105         int retval = 0;
1106
1107         /* Get new ID for the new battery device */
1108         mutex_lock(&battery_mutex);
1109         num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
1110         mutex_unlock(&battery_mutex);
1111         if (num < 0)
1112                 return num;
1113
1114         name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
1115         if (!name) {
1116                 retval = -ENOMEM;
1117                 goto batt_failed;
1118         }
1119
1120         di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
1121         if (!di) {
1122                 retval = -ENOMEM;
1123                 goto batt_failed;
1124         }
1125
1126         di->id = num;
1127         di->dev = &client->dev;
1128         di->chip = id->driver_data;
1129         di->bus.read = &bq27xxx_battery_i2c_read;
1130         di->regs = bq27xxx_regs[di->chip];
1131
1132         retval = bq27xxx_powersupply_init(di, name);
1133         if (retval)
1134                 goto batt_failed;
1135
1136         /* Schedule a polling after about 1 min */
1137         schedule_delayed_work(&di->work, 60 * HZ);
1138
1139         i2c_set_clientdata(client, di);
1140
1141         if (client->irq) {
1142                 retval = devm_request_threaded_irq(&client->dev, client->irq,
1143                                 NULL, bq27xxx_battery_irq_handler_thread,
1144                                 IRQF_ONESHOT,
1145                                 name, di);
1146                 if (retval) {
1147                         dev_err(&client->dev,
1148                                 "Unable to register IRQ %d error %d\n",
1149                                 client->irq, retval);
1150                         return retval;
1151                 }
1152         }
1153
1154         return 0;
1155
1156 batt_failed:
1157         mutex_lock(&battery_mutex);
1158         idr_remove(&battery_id, num);
1159         mutex_unlock(&battery_mutex);
1160
1161         return retval;
1162 }
1163
1164 static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
1165 {
1166         struct bq27xxx_device_info *di = i2c_get_clientdata(client);
1167
1168         bq27xxx_powersupply_unregister(di);
1169
1170         mutex_lock(&battery_mutex);
1171         idr_remove(&battery_id, di->id);
1172         mutex_unlock(&battery_mutex);
1173
1174         return 0;
1175 }
1176
1177 static const struct i2c_device_id bq27xxx_id[] = {
1178         { "bq27200", BQ27000 },
1179         { "bq27210", BQ27010 },
1180         { "bq27500", BQ27500 },
1181         { "bq27510", BQ27500 },
1182         { "bq27520", BQ27500 },
1183         { "bq27530", BQ27530 },
1184         { "bq27531", BQ27530 },
1185         { "bq27541", BQ27541 },
1186         { "bq27542", BQ27541 },
1187         { "bq27546", BQ27541 },
1188         { "bq27742", BQ27541 },
1189         { "bq27545", BQ27545 },
1190         { "bq27421", BQ27421 },
1191         { "bq27425", BQ27421 },
1192         { "bq27441", BQ27421 },
1193         { "bq27621", BQ27421 },
1194         {},
1195 };
1196 MODULE_DEVICE_TABLE(i2c, bq27xxx_id);
1197
1198 static struct i2c_driver bq27xxx_battery_i2c_driver = {
1199         .driver = {
1200                 .name = "bq27xxx-battery",
1201         },
1202         .probe = bq27xxx_battery_i2c_probe,
1203         .remove = bq27xxx_battery_i2c_remove,
1204         .id_table = bq27xxx_id,
1205 };
1206
1207 static inline int bq27xxx_battery_i2c_init(void)
1208 {
1209         int ret = i2c_add_driver(&bq27xxx_battery_i2c_driver);
1210
1211         if (ret)
1212                 pr_err("Unable to register BQ27xxx i2c driver\n");
1213
1214         return ret;
1215 }
1216
1217 static inline void bq27xxx_battery_i2c_exit(void)
1218 {
1219         i2c_del_driver(&bq27xxx_battery_i2c_driver);
1220 }
1221
1222 #else
1223
1224 static inline int bq27xxx_battery_i2c_init(void) { return 0; }
1225 static inline void bq27xxx_battery_i2c_exit(void) {};
1226
1227 #endif
1228
1229 /* platform specific code */
1230 #ifdef CONFIG_BATTERY_BQ27XXX_PLATFORM
1231
1232 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1233                                          bool single)
1234 {
1235         struct device *dev = di->dev;
1236         struct bq27xxx_platform_data *pdata = dev->platform_data;
1237         unsigned int timeout = 3;
1238         int upper, lower;
1239         int temp;
1240
1241         if (!single) {
1242                 /* Make sure the value has not changed in between reading the
1243                  * lower and the upper part */
1244                 upper = pdata->read(dev, reg + 1);
1245                 do {
1246                         temp = upper;
1247                         if (upper < 0)
1248                                 return upper;
1249
1250                         lower = pdata->read(dev, reg);
1251                         if (lower < 0)
1252                                 return lower;
1253
1254                         upper = pdata->read(dev, reg + 1);
1255                 } while (temp != upper && --timeout);
1256
1257                 if (timeout == 0)
1258                         return -EIO;
1259
1260                 return (upper << 8) | lower;
1261         }
1262
1263         return pdata->read(dev, reg);
1264 }
1265
1266 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1267 {
1268         struct bq27xxx_device_info *di;
1269         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1270         const char *name;
1271
1272         if (!pdata) {
1273                 dev_err(&pdev->dev, "no platform_data supplied\n");
1274                 return -EINVAL;
1275         }
1276
1277         if (!pdata->read) {
1278                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1279                 return -EINVAL;
1280         }
1281
1282         if (!pdata->chip) {
1283                 dev_err(&pdev->dev, "no device supplied\n");
1284                 return -EINVAL;
1285         }
1286
1287         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1288         if (!di)
1289                 return -ENOMEM;
1290
1291         platform_set_drvdata(pdev, di);
1292
1293         di->dev = &pdev->dev;
1294         di->chip = pdata->chip;
1295
1296         name = pdata->name ?: dev_name(&pdev->dev);
1297         di->bus.read = &bq27xxx_battery_platform_read;
1298
1299         return bq27xxx_powersupply_init(di, name);
1300 }
1301
1302 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1303 {
1304         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1305
1306         bq27xxx_powersupply_unregister(di);
1307
1308         return 0;
1309 }
1310
1311 static struct platform_driver bq27xxx_battery_platform_driver = {
1312         .probe  = bq27xxx_battery_platform_probe,
1313         .remove = bq27xxx_battery_platform_remove,
1314         .driver = {
1315                 .name = "bq27000-battery",
1316         },
1317 };
1318
1319 static inline int bq27xxx_battery_platform_init(void)
1320 {
1321         int ret = platform_driver_register(&bq27xxx_battery_platform_driver);
1322
1323         if (ret)
1324                 pr_err("Unable to register BQ27xxx platform driver\n");
1325
1326         return ret;
1327 }
1328
1329 static inline void bq27xxx_battery_platform_exit(void)
1330 {
1331         platform_driver_unregister(&bq27xxx_battery_platform_driver);
1332 }
1333
1334 #else
1335
1336 static inline int bq27xxx_battery_platform_init(void) { return 0; }
1337 static inline void bq27xxx_battery_platform_exit(void) {};
1338
1339 #endif
1340
1341 /*
1342  * Module stuff
1343  */
1344
1345 static int __init bq27xxx_battery_init(void)
1346 {
1347         int ret;
1348
1349         ret = bq27xxx_battery_i2c_init();
1350         if (ret)
1351                 return ret;
1352
1353         ret = bq27xxx_battery_platform_init();
1354         if (ret)
1355                 bq27xxx_battery_i2c_exit();
1356
1357         return ret;
1358 }
1359 module_init(bq27xxx_battery_init);
1360
1361 static void __exit bq27xxx_battery_exit(void)
1362 {
1363         bq27xxx_battery_platform_exit();
1364         bq27xxx_battery_i2c_exit();
1365 }
1366 module_exit(bq27xxx_battery_exit);
1367
1368 #ifdef CONFIG_BATTERY_BQ27XXX_PLATFORM
1369 MODULE_ALIAS("platform:bq27000-battery");
1370 #endif
1371
1372 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1373 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1374 MODULE_LICENSE("GPL");