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