drivers/power/bq27xxx_battery.c

   1 /*
   2  * BQ27xxx battery driver
   3  *
   4  * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
   5  * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
   6  * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
   7  * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
   8  *
   9  * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
  10  *
  11  * This package is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  17  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  18  *
  19  * Datasheets:
  20  * http://www.ti.com/product/bq27000
  21  * http://www.ti.com/product/bq27200
  22  * http://www.ti.com/product/bq27010
  23  * http://www.ti.com/product/bq27210
  24  * http://www.ti.com/product/bq27500
  25  * http://www.ti.com/product/bq27510-g3
  26  * http://www.ti.com/product/bq27520-g4
  27  * http://www.ti.com/product/bq27530-g1
  28  * http://www.ti.com/product/bq27531-g1
  29  * http://www.ti.com/product/bq27541-g1
  30  * http://www.ti.com/product/bq27542-g1
  31  * http://www.ti.com/product/bq27546-g1
  32  * http://www.ti.com/product/bq27742-g1
  33  * http://www.ti.com/product/bq27545-g1
  34  * http://www.ti.com/product/bq27421-g1
  35  * http://www.ti.com/product/bq27425-g1
  36  * http://www.ti.com/product/bq27411-g1
  37  * http://www.ti.com/product/bq27621-g1
  38  */
  39
  40 #include <linux/device.h>
  41 #include <linux/module.h>
  42 #include <linux/param.h>
  43 #include <linux/jiffies.h>
  44 #include <linux/workqueue.h>
  45 #include <linux/delay.h>
  46 #include <linux/platform_device.h>
  47 #include <linux/power_supply.h>
  48 #include <linux/slab.h>
  49 #include <linux/of.h>
  50
  51 #include <linux/power/bq27xxx_battery.h>
  52
  53 #define DRIVER_VERSION          "1.2.0"
  54
  55 #define BQ27XXX_MANUFACTURER    "Texas Instruments"
  56
  57 /* BQ27XXX Flags */
  58 #define BQ27XXX_FLAG_DSC        BIT(0)
  59 #define BQ27XXX_FLAG_SOCF       BIT(1) /* State-of-Charge threshold final */
  60 #define BQ27XXX_FLAG_SOC1       BIT(2) /* State-of-Charge threshold 1 */
  61 #define BQ27XXX_FLAG_FC         BIT(9)
  62 #define BQ27XXX_FLAG_OTD        BIT(14)
  63 #define BQ27XXX_FLAG_OTC        BIT(15)
  64 #define BQ27XXX_FLAG_UT         BIT(14)
  65 #define BQ27XXX_FLAG_OT         BIT(15)
  66
  67 /* BQ27000 has different layout for Flags register */
  68 #define BQ27000_FLAG_EDVF       BIT(0) /* Final End-of-Discharge-Voltage flag */
  69 #define BQ27000_FLAG_EDV1       BIT(1) /* First End-of-Discharge-Voltage flag */
  70 #define BQ27000_FLAG_CI         BIT(4) /* Capacity Inaccurate flag */
  71 #define BQ27000_FLAG_FC         BIT(5)
  72 #define BQ27000_FLAG_CHGS       BIT(7) /* Charge state flag */
  73
  74 #define BQ27XXX_RS                      (20) /* Resistor sense mOhm */
  75 #define BQ27XXX_POWER_CONSTANT          (29200) /* 29.2 µV^2 * 1000 */
  76 #define BQ27XXX_CURRENT_CONSTANT        (3570) /* 3.57 µV * 1000 */
  77
  78 #define INVALID_REG_ADDR        0xff
  79
  80 /*
  81  * bq27xxx_reg_index - Register names
  82  *
  83  * These are indexes into a device's register mapping array.
  84  */
  85
  86 enum bq27xxx_reg_index {
  87         BQ27XXX_REG_CTRL = 0,   /* Control */
  88         BQ27XXX_REG_TEMP,       /* Temperature */
  89         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
  90         BQ27XXX_REG_VOLT,       /* Voltage */
  91         BQ27XXX_REG_AI,         /* Average Current */
  92         BQ27XXX_REG_FLAGS,      /* Flags */
  93         BQ27XXX_REG_TTE,        /* Time-to-Empty */
  94         BQ27XXX_REG_TTF,        /* Time-to-Full */
  95         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
  96         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
  97         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
  98         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
  99         BQ27XXX_REG_CYCT,       /* Cycle Count */
 100         BQ27XXX_REG_AE,         /* Available Energy */
 101         BQ27XXX_REG_SOC,        /* State-of-Charge */
 102         BQ27XXX_REG_DCAP,       /* Design Capacity */
 103         BQ27XXX_REG_AP,         /* Average Power */
 104         BQ27XXX_REG_MAX,        /* sentinel */
 105 };
 106
 107 /* Register mappings */
 108 static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 109         [BQ27000] = {
 110                 [BQ27XXX_REG_CTRL] = 0x00,
 111                 [BQ27XXX_REG_TEMP] = 0x06,
 112                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 113                 [BQ27XXX_REG_VOLT] = 0x08,
 114                 [BQ27XXX_REG_AI] = 0x14,
 115                 [BQ27XXX_REG_FLAGS] = 0x0a,
 116                 [BQ27XXX_REG_TTE] = 0x16,
 117                 [BQ27XXX_REG_TTF] = 0x18,
 118                 [BQ27XXX_REG_TTES] = 0x1c,
 119                 [BQ27XXX_REG_TTECP] = 0x26,
 120                 [BQ27XXX_REG_NAC] = 0x0c,
 121                 [BQ27XXX_REG_FCC] = 0x12,
 122                 [BQ27XXX_REG_CYCT] = 0x2a,
 123                 [BQ27XXX_REG_AE] = 0x22,
 124                 [BQ27XXX_REG_SOC] = 0x0b,
 125                 [BQ27XXX_REG_DCAP] = 0x76,
 126                 [BQ27XXX_REG_AP] = 0x24,
 127         },
 128         [BQ27010] = {
 129                 [BQ27XXX_REG_CTRL] = 0x00,
 130                 [BQ27XXX_REG_TEMP] = 0x06,
 131                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 132                 [BQ27XXX_REG_VOLT] = 0x08,
 133                 [BQ27XXX_REG_AI] = 0x14,
 134                 [BQ27XXX_REG_FLAGS] = 0x0a,
 135                 [BQ27XXX_REG_TTE] = 0x16,
 136                 [BQ27XXX_REG_TTF] = 0x18,
 137                 [BQ27XXX_REG_TTES] = 0x1c,
 138                 [BQ27XXX_REG_TTECP] = 0x26,
 139                 [BQ27XXX_REG_NAC] = 0x0c,
 140                 [BQ27XXX_REG_FCC] = 0x12,
 141                 [BQ27XXX_REG_CYCT] = 0x2a,
 142                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 143                 [BQ27XXX_REG_SOC] = 0x0b,
 144                 [BQ27XXX_REG_DCAP] = 0x76,
 145                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 146         },
 147         [BQ27500] = {
 148                 [BQ27XXX_REG_CTRL] = 0x00,
 149                 [BQ27XXX_REG_TEMP] = 0x06,
 150                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 151                 [BQ27XXX_REG_VOLT] = 0x08,
 152                 [BQ27XXX_REG_AI] = 0x14,
 153                 [BQ27XXX_REG_FLAGS] = 0x0a,
 154                 [BQ27XXX_REG_TTE] = 0x16,
 155                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 156                 [BQ27XXX_REG_TTES] = 0x1a,
 157                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 158                 [BQ27XXX_REG_NAC] = 0x0c,
 159                 [BQ27XXX_REG_FCC] = 0x12,
 160                 [BQ27XXX_REG_CYCT] = 0x2a,
 161                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 162                 [BQ27XXX_REG_SOC] = 0x2c,
 163                 [BQ27XXX_REG_DCAP] = 0x3c,
 164                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 165         },
 166         [BQ27530] = {
 167                 [BQ27XXX_REG_CTRL] = 0x00,
 168                 [BQ27XXX_REG_TEMP] = 0x06,
 169                 [BQ27XXX_REG_INT_TEMP] = 0x32,
 170                 [BQ27XXX_REG_VOLT] = 0x08,
 171                 [BQ27XXX_REG_AI] = 0x14,
 172                 [BQ27XXX_REG_FLAGS] = 0x0a,
 173                 [BQ27XXX_REG_TTE] = 0x16,
 174                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 175                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 176                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 177                 [BQ27XXX_REG_NAC] = 0x0c,
 178                 [BQ27XXX_REG_FCC] = 0x12,
 179                 [BQ27XXX_REG_CYCT] = 0x2a,
 180                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 181                 [BQ27XXX_REG_SOC] = 0x2c,
 182                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 183                 [BQ27XXX_REG_AP] = 0x24,
 184         },
 185         [BQ27541] = {
 186                 [BQ27XXX_REG_CTRL] = 0x00,
 187                 [BQ27XXX_REG_TEMP] = 0x06,
 188                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 189                 [BQ27XXX_REG_VOLT] = 0x08,
 190                 [BQ27XXX_REG_AI] = 0x14,
 191                 [BQ27XXX_REG_FLAGS] = 0x0a,
 192                 [BQ27XXX_REG_TTE] = 0x16,
 193                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 194                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 195                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 196                 [BQ27XXX_REG_NAC] = 0x0c,
 197                 [BQ27XXX_REG_FCC] = 0x12,
 198                 [BQ27XXX_REG_CYCT] = 0x2a,
 199                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 200                 [BQ27XXX_REG_SOC] = 0x2c,
 201                 [BQ27XXX_REG_DCAP] = 0x3c,
 202                 [BQ27XXX_REG_AP] = 0x24,
 203         },
 204         [BQ27545] = {
 205                 [BQ27XXX_REG_CTRL] = 0x00,
 206                 [BQ27XXX_REG_TEMP] = 0x06,
 207                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 208                 [BQ27XXX_REG_VOLT] = 0x08,
 209                 [BQ27XXX_REG_AI] = 0x14,
 210                 [BQ27XXX_REG_FLAGS] = 0x0a,
 211                 [BQ27XXX_REG_TTE] = 0x16,
 212                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 213                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 214                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 215                 [BQ27XXX_REG_NAC] = 0x0c,
 216                 [BQ27XXX_REG_FCC] = 0x12,
 217                 [BQ27XXX_REG_CYCT] = 0x2a,
 218                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 219                 [BQ27XXX_REG_SOC] = 0x2c,
 220                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 221                 [BQ27XXX_REG_AP] = 0x24,
 222         },
 223         [BQ27421] = {
 224                 [BQ27XXX_REG_CTRL] = 0x00,
 225                 [BQ27XXX_REG_TEMP] = 0x02,
 226                 [BQ27XXX_REG_INT_TEMP] = 0x1e,
 227                 [BQ27XXX_REG_VOLT] = 0x04,
 228                 [BQ27XXX_REG_AI] = 0x10,
 229                 [BQ27XXX_REG_FLAGS] = 0x06,
 230                 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
 231                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 232                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 233                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 234                 [BQ27XXX_REG_NAC] = 0x08,
 235                 [BQ27XXX_REG_FCC] = 0x0e,
 236                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 237                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 238                 [BQ27XXX_REG_SOC] = 0x1c,
 239                 [BQ27XXX_REG_DCAP] = 0x3c,
 240                 [BQ27XXX_REG_AP] = 0x18,
 241         },
 242 };
 243
 244 static enum power_supply_property bq27000_battery_props[] = {
 245         POWER_SUPPLY_PROP_STATUS,
 246         POWER_SUPPLY_PROP_PRESENT,
 247         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 248         POWER_SUPPLY_PROP_CURRENT_NOW,
 249         POWER_SUPPLY_PROP_CAPACITY,
 250         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 251         POWER_SUPPLY_PROP_TEMP,
 252         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 253         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 254         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 255         POWER_SUPPLY_PROP_TECHNOLOGY,
 256         POWER_SUPPLY_PROP_CHARGE_FULL,
 257         POWER_SUPPLY_PROP_CHARGE_NOW,
 258         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 259         POWER_SUPPLY_PROP_CYCLE_COUNT,
 260         POWER_SUPPLY_PROP_ENERGY_NOW,
 261         POWER_SUPPLY_PROP_POWER_AVG,
 262         POWER_SUPPLY_PROP_HEALTH,
 263         POWER_SUPPLY_PROP_MANUFACTURER,
 264 };
 265
 266 static enum power_supply_property bq27010_battery_props[] = {
 267         POWER_SUPPLY_PROP_STATUS,
 268         POWER_SUPPLY_PROP_PRESENT,
 269         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 270         POWER_SUPPLY_PROP_CURRENT_NOW,
 271         POWER_SUPPLY_PROP_CAPACITY,
 272         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 273         POWER_SUPPLY_PROP_TEMP,
 274         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 275         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 276         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 277         POWER_SUPPLY_PROP_TECHNOLOGY,
 278         POWER_SUPPLY_PROP_CHARGE_FULL,
 279         POWER_SUPPLY_PROP_CHARGE_NOW,
 280         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 281         POWER_SUPPLY_PROP_CYCLE_COUNT,
 282         POWER_SUPPLY_PROP_HEALTH,
 283         POWER_SUPPLY_PROP_MANUFACTURER,
 284 };
 285
 286 static enum power_supply_property bq27500_battery_props[] = {
 287         POWER_SUPPLY_PROP_STATUS,
 288         POWER_SUPPLY_PROP_PRESENT,
 289         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 290         POWER_SUPPLY_PROP_CURRENT_NOW,
 291         POWER_SUPPLY_PROP_CAPACITY,
 292         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 293         POWER_SUPPLY_PROP_TEMP,
 294         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 295         POWER_SUPPLY_PROP_TECHNOLOGY,
 296         POWER_SUPPLY_PROP_CHARGE_FULL,
 297         POWER_SUPPLY_PROP_CHARGE_NOW,
 298         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 299         POWER_SUPPLY_PROP_CYCLE_COUNT,
 300         POWER_SUPPLY_PROP_HEALTH,
 301         POWER_SUPPLY_PROP_MANUFACTURER,
 302 };
 303
 304 static enum power_supply_property bq27530_battery_props[] = {
 305         POWER_SUPPLY_PROP_STATUS,
 306         POWER_SUPPLY_PROP_PRESENT,
 307         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 308         POWER_SUPPLY_PROP_CURRENT_NOW,
 309         POWER_SUPPLY_PROP_CAPACITY,
 310         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 311         POWER_SUPPLY_PROP_TEMP,
 312         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 313         POWER_SUPPLY_PROP_TECHNOLOGY,
 314         POWER_SUPPLY_PROP_CHARGE_FULL,
 315         POWER_SUPPLY_PROP_CHARGE_NOW,
 316         POWER_SUPPLY_PROP_POWER_AVG,
 317         POWER_SUPPLY_PROP_HEALTH,
 318         POWER_SUPPLY_PROP_CYCLE_COUNT,
 319         POWER_SUPPLY_PROP_MANUFACTURER,
 320 };
 321
 322 static enum power_supply_property bq27541_battery_props[] = {
 323         POWER_SUPPLY_PROP_STATUS,
 324         POWER_SUPPLY_PROP_PRESENT,
 325         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 326         POWER_SUPPLY_PROP_CURRENT_NOW,
 327         POWER_SUPPLY_PROP_CAPACITY,
 328         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 329         POWER_SUPPLY_PROP_TEMP,
 330         POWER_SUPPLY_PROP_TIME_TO_EMPTY_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_POWER_AVG,
 337         POWER_SUPPLY_PROP_HEALTH,
 338         POWER_SUPPLY_PROP_MANUFACTURER,
 339 };
 340
 341 static enum power_supply_property bq27545_battery_props[] = {
 342         POWER_SUPPLY_PROP_STATUS,
 343         POWER_SUPPLY_PROP_PRESENT,
 344         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 345         POWER_SUPPLY_PROP_CURRENT_NOW,
 346         POWER_SUPPLY_PROP_CAPACITY,
 347         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 348         POWER_SUPPLY_PROP_TEMP,
 349         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 350         POWER_SUPPLY_PROP_TECHNOLOGY,
 351         POWER_SUPPLY_PROP_CHARGE_FULL,
 352         POWER_SUPPLY_PROP_CHARGE_NOW,
 353         POWER_SUPPLY_PROP_HEALTH,
 354         POWER_SUPPLY_PROP_CYCLE_COUNT,
 355         POWER_SUPPLY_PROP_POWER_AVG,
 356         POWER_SUPPLY_PROP_MANUFACTURER,
 357 };
 358
 359 static enum power_supply_property bq27421_battery_props[] = {
 360         POWER_SUPPLY_PROP_STATUS,
 361         POWER_SUPPLY_PROP_PRESENT,
 362         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 363         POWER_SUPPLY_PROP_CURRENT_NOW,
 364         POWER_SUPPLY_PROP_CAPACITY,
 365         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 366         POWER_SUPPLY_PROP_TEMP,
 367         POWER_SUPPLY_PROP_TECHNOLOGY,
 368         POWER_SUPPLY_PROP_CHARGE_FULL,
 369         POWER_SUPPLY_PROP_CHARGE_NOW,
 370         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 371         POWER_SUPPLY_PROP_MANUFACTURER,
 372 };
 373
 374 #define BQ27XXX_PROP(_id, _prop)                \
 375         [_id] = {                               \
 376                 .props = _prop,                 \
 377                 .size = ARRAY_SIZE(_prop),      \
 378         }
 379
 380 static struct {
 381         enum power_supply_property *props;
 382         size_t size;
 383 } bq27xxx_battery_props[] = {
 384         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
 385         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
 386         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
 387         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
 388         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
 389         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
 390         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
 391 };
 392
 393 static unsigned int poll_interval = 360;
 394 module_param(poll_interval, uint, 0644);
 395 MODULE_PARM_DESC(poll_interval,
 396                  "battery poll interval in seconds - 0 disables polling");
 397
 398 /*
 399  * Common code for BQ27xxx devices
 400  */
 401
 402 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 403                                bool single)
 404 {
 405         /* Reports EINVAL for invalid/missing registers */
 406         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 407                 return -EINVAL;
 408
 409         return di->bus.read(di, di->regs[reg_index], single);
 410 }
 411
 412 /*
 413  * Return the battery State-of-Charge
 414  * Or < 0 if something fails.
 415  */
 416 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 417 {
 418         int soc;
 419
 420         if (di->chip == BQ27000 || di->chip == BQ27010)
 421                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
 422         else
 423                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 424
 425         if (soc < 0)
 426                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 427
 428         return soc;
 429 }
 430
 431 /*
 432  * Return a battery charge value in µAh
 433  * Or < 0 if something fails.
 434  */
 435 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 436 {
 437         int charge;
 438
 439         charge = bq27xxx_read(di, reg, false);
 440         if (charge < 0) {
 441                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 442                         reg, charge);
 443                 return charge;
 444         }
 445
 446         if (di->chip == BQ27000 || di->chip == BQ27010)
 447                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 448         else
 449                 charge *= 1000;
 450
 451         return charge;
 452 }
 453
 454 /*
 455  * Return the battery Nominal available capacity in µAh
 456  * Or < 0 if something fails.
 457  */
 458 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 459 {
 460         int flags;
 461
 462         if (di->chip == BQ27000 || di->chip == BQ27010) {
 463                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 464                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 465                         return -ENODATA;
 466         }
 467
 468         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 469 }
 470
 471 /*
 472  * Return the battery Full Charge Capacity in µAh
 473  * Or < 0 if something fails.
 474  */
 475 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 476 {
 477         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 478 }
 479
 480 /*
 481  * Return the Design Capacity in µAh
 482  * Or < 0 if something fails.
 483  */
 484 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 485 {
 486         int dcap;
 487
 488         if (di->chip == BQ27000 || di->chip == BQ27010)
 489                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
 490         else
 491                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 492
 493         if (dcap < 0) {
 494                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 495                 return dcap;
 496         }
 497
 498         if (di->chip == BQ27000 || di->chip == BQ27010)
 499                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 500         else
 501                 dcap *= 1000;
 502
 503         return dcap;
 504 }
 505
 506 /*
 507  * Return the battery Available energy in µWh
 508  * Or < 0 if something fails.
 509  */
 510 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 511 {
 512         int ae;
 513
 514         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 515         if (ae < 0) {
 516                 dev_dbg(di->dev, "error reading available energy\n");
 517                 return ae;
 518         }
 519
 520         if (di->chip == BQ27000 || di->chip == BQ27010)
 521                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 522         else
 523                 ae *= 1000;
 524
 525         return ae;
 526 }
 527
 528 /*
 529  * Return the battery temperature in tenths of degree Kelvin
 530  * Or < 0 if something fails.
 531  */
 532 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 533 {
 534         int temp;
 535
 536         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 537         if (temp < 0) {
 538                 dev_err(di->dev, "error reading temperature\n");
 539                 return temp;
 540         }
 541
 542         if (di->chip == BQ27000 || di->chip == BQ27010)
 543                 temp = 5 * temp / 2;
 544
 545         return temp;
 546 }
 547
 548 /*
 549  * Return the battery Cycle count total
 550  * Or < 0 if something fails.
 551  */
 552 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 553 {
 554         int cyct;
 555
 556         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 557         if (cyct < 0)
 558                 dev_err(di->dev, "error reading cycle count total\n");
 559
 560         return cyct;
 561 }
 562
 563 /*
 564  * Read a time register.
 565  * Return < 0 if something fails.
 566  */
 567 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 568 {
 569         int tval;
 570
 571         tval = bq27xxx_read(di, reg, false);
 572         if (tval < 0) {
 573                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 574                         reg, tval);
 575                 return tval;
 576         }
 577
 578         if (tval == 65535)
 579                 return -ENODATA;
 580
 581         return tval * 60;
 582 }
 583
 584 /*
 585  * Read an average power register.
 586  * Return < 0 if something fails.
 587  */
 588 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 589 {
 590         int tval;
 591
 592         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 593         if (tval < 0) {
 594                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 595                         BQ27XXX_REG_AP, tval);
 596                 return tval;
 597         }
 598
 599         if (di->chip == BQ27000 || di->chip == BQ27010)
 600                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 601         else
 602                 return tval;
 603 }
 604
 605 /*
 606  * Returns true if a battery over temperature condition is detected
 607  */
 608 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
 609 {
 610         if (di->chip == BQ27500 || di->chip == BQ27541 || di->chip == BQ27545)
 611                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 612         if (di->chip == BQ27530 || di->chip == BQ27421)
 613                 return flags & BQ27XXX_FLAG_OT;
 614
 615         return false;
 616 }
 617
 618 /*
 619  * Returns true if a battery under temperature condition is detected
 620  */
 621 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
 622 {
 623         if (di->chip == BQ27530 || di->chip == BQ27421)
 624                 return flags & BQ27XXX_FLAG_UT;
 625
 626         return false;
 627 }
 628
 629 /*
 630  * Returns true if a low state of charge condition is detected
 631  */
 632 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
 633 {
 634         if (di->chip == BQ27000 || di->chip == BQ27010)
 635                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
 636         else
 637                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
 638 }
 639
 640 /*
 641  * Read flag register.
 642  * Return < 0 if something fails.
 643  */
 644 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
 645 {
 646         int flags;
 647
 648         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
 649         if (flags < 0) {
 650                 dev_err(di->dev, "error reading flag register:%d\n", flags);
 651                 return flags;
 652         }
 653
 654         /* Unlikely but important to return first */
 655         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
 656                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 657         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
 658                 return POWER_SUPPLY_HEALTH_COLD;
 659         if (unlikely(bq27xxx_battery_dead(di, flags)))
 660                 return POWER_SUPPLY_HEALTH_DEAD;
 661
 662         return POWER_SUPPLY_HEALTH_GOOD;
 663 }
 664
 665 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
 666 {
 667         struct bq27xxx_reg_cache cache = {0, };
 668         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
 669         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 670
 671         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 672         if ((cache.flags & 0xff) == 0xff)
 673                 cache.flags = -1; /* read error */
 674         if (cache.flags >= 0) {
 675                 cache.temperature = bq27xxx_battery_read_temperature(di);
 676                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
 677                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
 678                         cache.capacity = -ENODATA;
 679                         cache.energy = -ENODATA;
 680                         cache.time_to_empty = -ENODATA;
 681                         cache.time_to_empty_avg = -ENODATA;
 682                         cache.time_to_full = -ENODATA;
 683                         cache.charge_full = -ENODATA;
 684                         cache.health = -ENODATA;
 685                 } else {
 686                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
 687                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
 688                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
 689                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
 690                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
 691                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
 692                         cache.charge_full = bq27xxx_battery_read_fcc(di);
 693                         cache.capacity = bq27xxx_battery_read_soc(di);
 694                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
 695                                 cache.energy = bq27xxx_battery_read_energy(di);
 696                         cache.health = bq27xxx_battery_read_health(di);
 697                 }
 698                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
 699                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
 700                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
 701                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
 702
 703                 /* We only have to read charge design full once */
 704                 if (di->charge_design_full <= 0)
 705                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
 706         }
 707
 708         if (di->cache.capacity != cache.capacity)
 709                 power_supply_changed(di->bat);
 710
 711         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 712                 di->cache = cache;
 713
 714         di->last_update = jiffies;
 715 }
 716 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
 717
 718 static void bq27xxx_battery_poll(struct work_struct *work)
 719 {
 720         struct bq27xxx_device_info *di =
 721                         container_of(work, struct bq27xxx_device_info,
 722                                      work.work);
 723
 724         bq27xxx_battery_update(di);
 725
 726         if (poll_interval > 0)
 727                 schedule_delayed_work(&di->work, poll_interval * HZ);
 728 }
 729
 730 /*
 731  * Return the battery average current in µA
 732  * Note that current can be negative signed as well
 733  * Or 0 if something fails.
 734  */
 735 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
 736                                    union power_supply_propval *val)
 737 {
 738         int curr;
 739         int flags;
 740
 741         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
 742         if (curr < 0) {
 743                 dev_err(di->dev, "error reading current\n");
 744                 return curr;
 745         }
 746
 747         if (di->chip == BQ27000 || di->chip == BQ27010) {
 748                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
 749                 if (flags & BQ27000_FLAG_CHGS) {
 750                         dev_dbg(di->dev, "negative current!\n");
 751                         curr = -curr;
 752                 }
 753
 754                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 755         } else {
 756                 /* Other gauges return signed value */
 757                 val->intval = (int)((s16)curr) * 1000;
 758         }
 759
 760         return 0;
 761 }
 762
 763 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
 764                                   union power_supply_propval *val)
 765 {
 766         int status;
 767
 768         if (di->chip == BQ27000 || di->chip == BQ27010) {
 769                 if (di->cache.flags & BQ27000_FLAG_FC)
 770                         status = POWER_SUPPLY_STATUS_FULL;
 771                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 772                         status = POWER_SUPPLY_STATUS_CHARGING;
 773                 else if (power_supply_am_i_supplied(di->bat))
 774                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 775                 else
 776                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 777         } else {
 778                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 779                         status = POWER_SUPPLY_STATUS_FULL;
 780                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
 781                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 782                 else
 783                         status = POWER_SUPPLY_STATUS_CHARGING;
 784         }
 785
 786         val->intval = status;
 787
 788         return 0;
 789 }
 790
 791 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
 792                                           union power_supply_propval *val)
 793 {
 794         int level;
 795
 796         if (di->chip == BQ27000 || di->chip == BQ27010) {
 797                 if (di->cache.flags & BQ27000_FLAG_FC)
 798                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 799                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 800                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 801                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 802                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 803                 else
 804                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 805         } else {
 806                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 807                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 808                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
 809                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 810                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
 811                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 812                 else
 813                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 814         }
 815
 816         val->intval = level;
 817
 818         return 0;
 819 }
 820
 821 /*
 822  * Return the battery Voltage in millivolts
 823  * Or < 0 if something fails.
 824  */
 825 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
 826                                    union power_supply_propval *val)
 827 {
 828         int volt;
 829
 830         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
 831         if (volt < 0) {
 832                 dev_err(di->dev, "error reading voltage\n");
 833                 return volt;
 834         }
 835
 836         val->intval = volt * 1000;
 837
 838         return 0;
 839 }
 840
 841 static int bq27xxx_simple_value(int value,
 842                                 union power_supply_propval *val)
 843 {
 844         if (value < 0)
 845                 return value;
 846
 847         val->intval = value;
 848
 849         return 0;
 850 }
 851
 852 static int bq27xxx_battery_get_property(struct power_supply *psy,
 853                                         enum power_supply_property psp,
 854                                         union power_supply_propval *val)
 855 {
 856         int ret = 0;
 857         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
 858
 859         mutex_lock(&di->lock);
 860         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 861                 cancel_delayed_work_sync(&di->work);
 862                 bq27xxx_battery_poll(&di->work.work);
 863         }
 864         mutex_unlock(&di->lock);
 865
 866         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 867                 return -ENODEV;
 868
 869         switch (psp) {
 870         case POWER_SUPPLY_PROP_STATUS:
 871                 ret = bq27xxx_battery_status(di, val);
 872                 break;
 873         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 874                 ret = bq27xxx_battery_voltage(di, val);
 875                 break;
 876         case POWER_SUPPLY_PROP_PRESENT:
 877                 val->intval = di->cache.flags < 0 ? 0 : 1;
 878                 break;
 879         case POWER_SUPPLY_PROP_CURRENT_NOW:
 880                 ret = bq27xxx_battery_current(di, val);
 881                 break;
 882         case POWER_SUPPLY_PROP_CAPACITY:
 883                 ret = bq27xxx_simple_value(di->cache.capacity, val);
 884                 break;
 885         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 886                 ret = bq27xxx_battery_capacity_level(di, val);
 887                 break;
 888         case POWER_SUPPLY_PROP_TEMP:
 889                 ret = bq27xxx_simple_value(di->cache.temperature, val);
 890                 if (ret == 0)
 891                         val->intval -= 2731; /* convert decidegree k to c */
 892                 break;
 893         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 894                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
 895                 break;
 896         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 897                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
 898                 break;
 899         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 900                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
 901                 break;
 902         case POWER_SUPPLY_PROP_TECHNOLOGY:
 903                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 904                 break;
 905         case POWER_SUPPLY_PROP_CHARGE_NOW:
 906                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
 907                 break;
 908         case POWER_SUPPLY_PROP_CHARGE_FULL:
 909                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
 910                 break;
 911         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 912                 ret = bq27xxx_simple_value(di->charge_design_full, val);
 913                 break;
 914         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 915                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
 916                 break;
 917         case POWER_SUPPLY_PROP_ENERGY_NOW:
 918                 ret = bq27xxx_simple_value(di->cache.energy, val);
 919                 break;
 920         case POWER_SUPPLY_PROP_POWER_AVG:
 921                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
 922                 break;
 923         case POWER_SUPPLY_PROP_HEALTH:
 924                 ret = bq27xxx_simple_value(di->cache.health, val);
 925                 break;
 926         case POWER_SUPPLY_PROP_MANUFACTURER:
 927                 val->strval = BQ27XXX_MANUFACTURER;
 928                 break;
 929         default:
 930                 return -EINVAL;
 931         }
 932
 933         return ret;
 934 }
 935
 936 static void bq27xxx_external_power_changed(struct power_supply *psy)
 937 {
 938         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
 939
 940         cancel_delayed_work_sync(&di->work);
 941         schedule_delayed_work(&di->work, 0);
 942 }
 943
 944 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
 945 {
 946         struct power_supply_desc *psy_desc;
 947         struct power_supply_config psy_cfg = { .drv_data = di, };
 948
 949         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
 950         mutex_init(&di->lock);
 951         di->regs = bq27xxx_regs[di->chip];
 952
 953         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
 954         if (!psy_desc)
 955                 return -ENOMEM;
 956
 957         psy_desc->name = di->name;
 958         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
 959         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
 960         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
 961         psy_desc->get_property = bq27xxx_battery_get_property;
 962         psy_desc->external_power_changed = bq27xxx_external_power_changed;
 963
 964         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
 965         if (IS_ERR(di->bat)) {
 966                 dev_err(di->dev, "failed to register battery\n");
 967                 return PTR_ERR(di->bat);
 968         }
 969
 970         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 971
 972         bq27xxx_battery_update(di);
 973
 974         return 0;
 975 }
 976 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
 977
 978 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
 979 {
 980         /*
 981          * power_supply_unregister call bq27xxx_battery_get_property which
 982          * call bq27xxx_battery_poll.
 983          * Make sure that bq27xxx_battery_poll will not call
 984          * schedule_delayed_work again after unregister (which cause OOPS).
 985          */
 986         poll_interval = 0;
 987
 988         cancel_delayed_work_sync(&di->work);
 989
 990         power_supply_unregister(di->bat);
 991
 992         mutex_destroy(&di->lock);
 993 }
 994 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
 995
 996 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
 997                                          bool single)
 998 {
 999         struct device *dev = di->dev;
1000         struct bq27xxx_platform_data *pdata = dev->platform_data;
1001         unsigned int timeout = 3;
1002         int upper, lower;
1003         int temp;
1004
1005         if (!single) {
1006                 /* Make sure the value has not changed in between reading the
1007                  * lower and the upper part */
1008                 upper = pdata->read(dev, reg + 1);
1009                 do {
1010                         temp = upper;
1011                         if (upper < 0)
1012                                 return upper;
1013
1014                         lower = pdata->read(dev, reg);
1015                         if (lower < 0)
1016                                 return lower;
1017
1018                         upper = pdata->read(dev, reg + 1);
1019                 } while (temp != upper && --timeout);
1020
1021                 if (timeout == 0)
1022                         return -EIO;
1023
1024                 return (upper << 8) | lower;
1025         }
1026
1027         return pdata->read(dev, reg);
1028 }
1029
1030 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1031 {
1032         struct bq27xxx_device_info *di;
1033         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1034
1035         if (!pdata) {
1036                 dev_err(&pdev->dev, "no platform_data supplied\n");
1037                 return -EINVAL;
1038         }
1039
1040         if (!pdata->read) {
1041                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1042                 return -EINVAL;
1043         }
1044
1045         if (!pdata->chip) {
1046                 dev_err(&pdev->dev, "no device supplied\n");
1047                 return -EINVAL;
1048         }
1049
1050         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1051         if (!di)
1052                 return -ENOMEM;
1053
1054         platform_set_drvdata(pdev, di);
1055
1056         di->dev = &pdev->dev;
1057         di->chip = pdata->chip;
1058         di->name = pdata->name ?: dev_name(&pdev->dev);
1059         di->bus.read = bq27xxx_battery_platform_read;
1060
1061         return bq27xxx_battery_setup(di);
1062 }
1063
1064 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1065 {
1066         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1067
1068         bq27xxx_battery_teardown(di);
1069
1070         return 0;
1071 }
1072
1073 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1074         { "bq27000-battery", },
1075         { /* sentinel */ }
1076 };
1077 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1078
1079 #ifdef CONFIG_OF
1080 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1081         { .compatible = "ti,bq27000" },
1082         {},
1083 };
1084 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1085 #endif
1086
1087 static struct platform_driver bq27xxx_battery_platform_driver = {
1088         .probe  = bq27xxx_battery_platform_probe,
1089         .remove = bq27xxx_battery_platform_remove,
1090         .driver = {
1091                 .name = "bq27000-battery",
1092                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1093         },
1094         .id_table = bq27xxx_battery_platform_id_table,
1095 };
1096 module_platform_driver(bq27xxx_battery_platform_driver);
1097
1098 MODULE_ALIAS("platform:bq27000-battery");
1099
1100 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1101 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1102 MODULE_LICENSE("GPL");