drivers/power/supply/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-g1
  26  * http://www.ti.com/product/bq27510-g2
  27  * http://www.ti.com/product/bq27510-g3
  28  * http://www.ti.com/product/bq27520-g4
  29  * http://www.ti.com/product/bq27520-g1
  30  * http://www.ti.com/product/bq27520-g2
  31  * http://www.ti.com/product/bq27520-g3
  32  * http://www.ti.com/product/bq27520-g4
  33  * http://www.ti.com/product/bq27530-g1
  34  * http://www.ti.com/product/bq27531-g1
  35  * http://www.ti.com/product/bq27541-g1
  36  * http://www.ti.com/product/bq27542-g1
  37  * http://www.ti.com/product/bq27546-g1
  38  * http://www.ti.com/product/bq27742-g1
  39  * http://www.ti.com/product/bq27545-g1
  40  * http://www.ti.com/product/bq27421-g1
  41  * http://www.ti.com/product/bq27425-g1
  42  * http://www.ti.com/product/bq27411-g1
  43  * http://www.ti.com/product/bq27621-g1
  44  */
  45
  46 #include <linux/device.h>
  47 #include <linux/module.h>
  48 #include <linux/mutex.h>
  49 #include <linux/param.h>
  50 #include <linux/jiffies.h>
  51 #include <linux/workqueue.h>
  52 #include <linux/delay.h>
  53 #include <linux/platform_device.h>
  54 #include <linux/power_supply.h>
  55 #include <linux/slab.h>
  56 #include <linux/of.h>
  57
  58 #include <linux/power/bq27xxx_battery.h>
  59
  60 #define DRIVER_VERSION          "1.2.0"
  61
  62 #define BQ27XXX_MANUFACTURER    "Texas Instruments"
  63
  64 /* BQ27XXX Flags */
  65 #define BQ27XXX_FLAG_DSC        BIT(0)
  66 #define BQ27XXX_FLAG_SOCF       BIT(1) /* State-of-Charge threshold final */
  67 #define BQ27XXX_FLAG_SOC1       BIT(2) /* State-of-Charge threshold 1 */
  68 #define BQ27XXX_FLAG_FC         BIT(9)
  69 #define BQ27XXX_FLAG_OTD        BIT(14)
  70 #define BQ27XXX_FLAG_OTC        BIT(15)
  71 #define BQ27XXX_FLAG_UT         BIT(14)
  72 #define BQ27XXX_FLAG_OT         BIT(15)
  73
  74 /* BQ27000 has different layout for Flags register */
  75 #define BQ27000_FLAG_EDVF       BIT(0) /* Final End-of-Discharge-Voltage flag */
  76 #define BQ27000_FLAG_EDV1       BIT(1) /* First End-of-Discharge-Voltage flag */
  77 #define BQ27000_FLAG_CI         BIT(4) /* Capacity Inaccurate flag */
  78 #define BQ27000_FLAG_FC         BIT(5)
  79 #define BQ27000_FLAG_CHGS       BIT(7) /* Charge state flag */
  80
  81 #define BQ27XXX_RS                      (20) /* Resistor sense mOhm */
  82 #define BQ27XXX_POWER_CONSTANT          (29200) /* 29.2 µV^2 * 1000 */
  83 #define BQ27XXX_CURRENT_CONSTANT        (3570) /* 3.57 µV * 1000 */
  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
  93 enum bq27xxx_reg_index {
  94         BQ27XXX_REG_CTRL = 0,   /* Control */
  95         BQ27XXX_REG_TEMP,       /* Temperature */
  96         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
  97         BQ27XXX_REG_VOLT,       /* Voltage */
  98         BQ27XXX_REG_AI,         /* Average Current */
  99         BQ27XXX_REG_FLAGS,      /* Flags */
 100         BQ27XXX_REG_TTE,        /* Time-to-Empty */
 101         BQ27XXX_REG_TTF,        /* Time-to-Full */
 102         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
 103         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
 104         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
 105         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
 106         BQ27XXX_REG_CYCT,       /* Cycle Count */
 107         BQ27XXX_REG_AE,         /* Available Energy */
 108         BQ27XXX_REG_SOC,        /* State-of-Charge */
 109         BQ27XXX_REG_DCAP,       /* Design Capacity */
 110         BQ27XXX_REG_AP,         /* Average Power */
 111         BQ27XXX_REG_MAX,        /* sentinel */
 112 };
 113
 114 /* Register mappings */
 115 static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 116         [BQ27000] = {
 117                 [BQ27XXX_REG_CTRL] = 0x00,
 118                 [BQ27XXX_REG_TEMP] = 0x06,
 119                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 120                 [BQ27XXX_REG_VOLT] = 0x08,
 121                 [BQ27XXX_REG_AI] = 0x14,
 122                 [BQ27XXX_REG_FLAGS] = 0x0a,
 123                 [BQ27XXX_REG_TTE] = 0x16,
 124                 [BQ27XXX_REG_TTF] = 0x18,
 125                 [BQ27XXX_REG_TTES] = 0x1c,
 126                 [BQ27XXX_REG_TTECP] = 0x26,
 127                 [BQ27XXX_REG_NAC] = 0x0c,
 128                 [BQ27XXX_REG_FCC] = 0x12,
 129                 [BQ27XXX_REG_CYCT] = 0x2a,
 130                 [BQ27XXX_REG_AE] = 0x22,
 131                 [BQ27XXX_REG_SOC] = 0x0b,
 132                 [BQ27XXX_REG_DCAP] = 0x76,
 133                 [BQ27XXX_REG_AP] = 0x24,
 134         },
 135         [BQ27010] = {
 136                 [BQ27XXX_REG_CTRL] = 0x00,
 137                 [BQ27XXX_REG_TEMP] = 0x06,
 138                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 139                 [BQ27XXX_REG_VOLT] = 0x08,
 140                 [BQ27XXX_REG_AI] = 0x14,
 141                 [BQ27XXX_REG_FLAGS] = 0x0a,
 142                 [BQ27XXX_REG_TTE] = 0x16,
 143                 [BQ27XXX_REG_TTF] = 0x18,
 144                 [BQ27XXX_REG_TTES] = 0x1c,
 145                 [BQ27XXX_REG_TTECP] = 0x26,
 146                 [BQ27XXX_REG_NAC] = 0x0c,
 147                 [BQ27XXX_REG_FCC] = 0x12,
 148                 [BQ27XXX_REG_CYCT] = 0x2a,
 149                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 150                 [BQ27XXX_REG_SOC] = 0x0b,
 151                 [BQ27XXX_REG_DCAP] = 0x76,
 152                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 153         },
 154         [BQ2750X] = {
 155                 [BQ27XXX_REG_CTRL] = 0x00,
 156                 [BQ27XXX_REG_TEMP] = 0x06,
 157                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 158                 [BQ27XXX_REG_VOLT] = 0x08,
 159                 [BQ27XXX_REG_AI] = 0x14,
 160                 [BQ27XXX_REG_FLAGS] = 0x0a,
 161                 [BQ27XXX_REG_TTE] = 0x16,
 162                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 163                 [BQ27XXX_REG_TTES] = 0x1a,
 164                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 165                 [BQ27XXX_REG_NAC] = 0x0c,
 166                 [BQ27XXX_REG_FCC] = 0x12,
 167                 [BQ27XXX_REG_CYCT] = 0x2a,
 168                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 169                 [BQ27XXX_REG_SOC] = 0x2c,
 170                 [BQ27XXX_REG_DCAP] = 0x3c,
 171                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 172         },
 173         [BQ2751X] = {
 174                 [BQ27XXX_REG_CTRL] = 0x00,
 175                 [BQ27XXX_REG_TEMP] = 0x06,
 176                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 177                 [BQ27XXX_REG_VOLT] = 0x08,
 178                 [BQ27XXX_REG_AI] = 0x14,
 179                 [BQ27XXX_REG_FLAGS] = 0x0a,
 180                 [BQ27XXX_REG_TTE] = 0x16,
 181                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 182                 [BQ27XXX_REG_TTES] = 0x1a,
 183                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 184                 [BQ27XXX_REG_NAC] = 0x0c,
 185                 [BQ27XXX_REG_FCC] = 0x12,
 186                 [BQ27XXX_REG_CYCT] = 0x1e,
 187                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 188                 [BQ27XXX_REG_SOC] = 0x20,
 189                 [BQ27XXX_REG_DCAP] = 0x2e,
 190                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 191         },
 192         [BQ27500] = {
 193                 [BQ27XXX_REG_CTRL] = 0x00,
 194                 [BQ27XXX_REG_TEMP] = 0x06,
 195                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 196                 [BQ27XXX_REG_VOLT] = 0x08,
 197                 [BQ27XXX_REG_AI] = 0x14,
 198                 [BQ27XXX_REG_FLAGS] = 0x0a,
 199                 [BQ27XXX_REG_TTE] = 0x16,
 200                 [BQ27XXX_REG_TTF] = 0x18,
 201                 [BQ27XXX_REG_TTES] = 0x1c,
 202                 [BQ27XXX_REG_TTECP] = 0x26,
 203                 [BQ27XXX_REG_NAC] = 0x0c,
 204                 [BQ27XXX_REG_FCC] = 0x12,
 205                 [BQ27XXX_REG_CYCT] = 0x2a,
 206                 [BQ27XXX_REG_AE] = 0x22,
 207                 [BQ27XXX_REG_SOC] = 0x2c,
 208                 [BQ27XXX_REG_DCAP] = 0x3c,
 209                 [BQ27XXX_REG_AP] = 0x24,
 210         },
 211         [BQ27510G1] = {
 212                 [BQ27XXX_REG_CTRL] = 0x00,
 213                 [BQ27XXX_REG_TEMP] = 0x06,
 214                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 215                 [BQ27XXX_REG_VOLT] = 0x08,
 216                 [BQ27XXX_REG_AI] = 0x14,
 217                 [BQ27XXX_REG_FLAGS] = 0x0a,
 218                 [BQ27XXX_REG_TTE] = 0x16,
 219                 [BQ27XXX_REG_TTF] = 0x18,
 220                 [BQ27XXX_REG_TTES] = 0x1c,
 221                 [BQ27XXX_REG_TTECP] = 0x26,
 222                 [BQ27XXX_REG_NAC] = 0x0c,
 223                 [BQ27XXX_REG_FCC] = 0x12,
 224                 [BQ27XXX_REG_CYCT] = 0x2a,
 225                 [BQ27XXX_REG_AE] = 0x22,
 226                 [BQ27XXX_REG_SOC] = 0x2c,
 227                 [BQ27XXX_REG_DCAP] = 0x3c,
 228                 [BQ27XXX_REG_AP] = 0x24,
 229         },
 230         [BQ27510G2] = {
 231                 [BQ27XXX_REG_CTRL] = 0x00,
 232                 [BQ27XXX_REG_TEMP] = 0x06,
 233                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 234                 [BQ27XXX_REG_VOLT] = 0x08,
 235                 [BQ27XXX_REG_AI] = 0x14,
 236                 [BQ27XXX_REG_FLAGS] = 0x0a,
 237                 [BQ27XXX_REG_TTE] = 0x16,
 238                 [BQ27XXX_REG_TTF] = 0x18,
 239                 [BQ27XXX_REG_TTES] = 0x1c,
 240                 [BQ27XXX_REG_TTECP] = 0x26,
 241                 [BQ27XXX_REG_NAC] = 0x0c,
 242                 [BQ27XXX_REG_FCC] = 0x12,
 243                 [BQ27XXX_REG_CYCT] = 0x2a,
 244                 [BQ27XXX_REG_AE] = 0x22,
 245                 [BQ27XXX_REG_SOC] = 0x2c,
 246                 [BQ27XXX_REG_DCAP] = 0x3c,
 247                 [BQ27XXX_REG_AP] = 0x24,
 248         },
 249         [BQ27510G3] = {
 250                 [BQ27XXX_REG_CTRL] = 0x00,
 251                 [BQ27XXX_REG_TEMP] = 0x06,
 252                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 253                 [BQ27XXX_REG_VOLT] = 0x08,
 254                 [BQ27XXX_REG_AI] = 0x14,
 255                 [BQ27XXX_REG_FLAGS] = 0x0a,
 256                 [BQ27XXX_REG_TTE] = 0x16,
 257                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 258                 [BQ27XXX_REG_TTES] = 0x1a,
 259                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 260                 [BQ27XXX_REG_NAC] = 0x0c,
 261                 [BQ27XXX_REG_FCC] = 0x12,
 262                 [BQ27XXX_REG_CYCT] = 0x1e,
 263                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 264                 [BQ27XXX_REG_SOC] = 0x20,
 265                 [BQ27XXX_REG_DCAP] = 0x2e,
 266                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 267         },
 268         [BQ27520G1] = {
 269                 [BQ27XXX_REG_CTRL] = 0x00,
 270                 [BQ27XXX_REG_TEMP] = 0x06,
 271                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 272                 [BQ27XXX_REG_VOLT] = 0x08,
 273                 [BQ27XXX_REG_AI] = 0x14,
 274                 [BQ27XXX_REG_FLAGS] = 0x0a,
 275                 [BQ27XXX_REG_TTE] = 0x16,
 276                 [BQ27XXX_REG_TTF] = 0x18,
 277                 [BQ27XXX_REG_TTES] = 0x1c,
 278                 [BQ27XXX_REG_TTECP] = 0x26,
 279                 [BQ27XXX_REG_NAC] = 0x0c,
 280                 [BQ27XXX_REG_FCC] = 0x12,
 281                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 282                 [BQ27XXX_REG_AE] = 0x22,
 283                 [BQ27XXX_REG_SOC] = 0x2c,
 284                 [BQ27XXX_REG_DCAP] = 0x3c,
 285                 [BQ27XXX_REG_AP] = 0x24,
 286         },
 287         [BQ27520G2] = {
 288                 [BQ27XXX_REG_CTRL] = 0x00,
 289                 [BQ27XXX_REG_TEMP] = 0x06,
 290                 [BQ27XXX_REG_INT_TEMP] = 0x36,
 291                 [BQ27XXX_REG_VOLT] = 0x08,
 292                 [BQ27XXX_REG_AI] = 0x14,
 293                 [BQ27XXX_REG_FLAGS] = 0x0a,
 294                 [BQ27XXX_REG_TTE] = 0x16,
 295                 [BQ27XXX_REG_TTF] = 0x18,
 296                 [BQ27XXX_REG_TTES] = 0x1c,
 297                 [BQ27XXX_REG_TTECP] = 0x26,
 298                 [BQ27XXX_REG_NAC] = 0x0c,
 299                 [BQ27XXX_REG_FCC] = 0x12,
 300                 [BQ27XXX_REG_CYCT] = 0x2a,
 301                 [BQ27XXX_REG_AE] = 0x22,
 302                 [BQ27XXX_REG_SOC] = 0x2c,
 303                 [BQ27XXX_REG_DCAP] = 0x3c,
 304                 [BQ27XXX_REG_AP] = 0x24,
 305         },
 306         [BQ27520G3] = {
 307                 [BQ27XXX_REG_CTRL] = 0x00,
 308                 [BQ27XXX_REG_TEMP] = 0x06,
 309                 [BQ27XXX_REG_INT_TEMP] = 0x36,
 310                 [BQ27XXX_REG_VOLT] = 0x08,
 311                 [BQ27XXX_REG_AI] = 0x14,
 312                 [BQ27XXX_REG_FLAGS] = 0x0a,
 313                 [BQ27XXX_REG_TTE] = 0x16,
 314                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 315                 [BQ27XXX_REG_TTES] = 0x1c,
 316                 [BQ27XXX_REG_TTECP] = 0x26,
 317                 [BQ27XXX_REG_NAC] = 0x0c,
 318                 [BQ27XXX_REG_FCC] = 0x12,
 319                 [BQ27XXX_REG_CYCT] = 0x2a,
 320                 [BQ27XXX_REG_AE] = 0x22,
 321                 [BQ27XXX_REG_SOC] = 0x2c,
 322                 [BQ27XXX_REG_DCAP] = 0x3c,
 323                 [BQ27XXX_REG_AP] = 0x24,
 324         },
 325         [BQ27520G4] = {
 326                 [BQ27XXX_REG_CTRL] = 0x00,
 327                 [BQ27XXX_REG_TEMP] = 0x06,
 328                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 329                 [BQ27XXX_REG_VOLT] = 0x08,
 330                 [BQ27XXX_REG_AI] = 0x14,
 331                 [BQ27XXX_REG_FLAGS] = 0x0a,
 332                 [BQ27XXX_REG_TTE] = 0x16,
 333                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 334                 [BQ27XXX_REG_TTES] = 0x1c,
 335                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 336                 [BQ27XXX_REG_NAC] = 0x0c,
 337                 [BQ27XXX_REG_FCC] = 0x12,
 338                 [BQ27XXX_REG_CYCT] = 0x1e,
 339                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 340                 [BQ27XXX_REG_SOC] = 0x20,
 341                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 342                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 343         },
 344         [BQ27530] = {
 345                 [BQ27XXX_REG_CTRL] = 0x00,
 346                 [BQ27XXX_REG_TEMP] = 0x06,
 347                 [BQ27XXX_REG_INT_TEMP] = 0x32,
 348                 [BQ27XXX_REG_VOLT] = 0x08,
 349                 [BQ27XXX_REG_AI] = 0x14,
 350                 [BQ27XXX_REG_FLAGS] = 0x0a,
 351                 [BQ27XXX_REG_TTE] = 0x16,
 352                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 353                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 354                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 355                 [BQ27XXX_REG_NAC] = 0x0c,
 356                 [BQ27XXX_REG_FCC] = 0x12,
 357                 [BQ27XXX_REG_CYCT] = 0x2a,
 358                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 359                 [BQ27XXX_REG_SOC] = 0x2c,
 360                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 361                 [BQ27XXX_REG_AP] = 0x24,
 362         },
 363         [BQ27541] = {
 364                 [BQ27XXX_REG_CTRL] = 0x00,
 365                 [BQ27XXX_REG_TEMP] = 0x06,
 366                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 367                 [BQ27XXX_REG_VOLT] = 0x08,
 368                 [BQ27XXX_REG_AI] = 0x14,
 369                 [BQ27XXX_REG_FLAGS] = 0x0a,
 370                 [BQ27XXX_REG_TTE] = 0x16,
 371                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 372                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 373                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 374                 [BQ27XXX_REG_NAC] = 0x0c,
 375                 [BQ27XXX_REG_FCC] = 0x12,
 376                 [BQ27XXX_REG_CYCT] = 0x2a,
 377                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 378                 [BQ27XXX_REG_SOC] = 0x2c,
 379                 [BQ27XXX_REG_DCAP] = 0x3c,
 380                 [BQ27XXX_REG_AP] = 0x24,
 381         },
 382         [BQ27545] = {
 383                 [BQ27XXX_REG_CTRL] = 0x00,
 384                 [BQ27XXX_REG_TEMP] = 0x06,
 385                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 386                 [BQ27XXX_REG_VOLT] = 0x08,
 387                 [BQ27XXX_REG_AI] = 0x14,
 388                 [BQ27XXX_REG_FLAGS] = 0x0a,
 389                 [BQ27XXX_REG_TTE] = 0x16,
 390                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 391                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 392                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 393                 [BQ27XXX_REG_NAC] = 0x0c,
 394                 [BQ27XXX_REG_FCC] = 0x12,
 395                 [BQ27XXX_REG_CYCT] = 0x2a,
 396                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 397                 [BQ27XXX_REG_SOC] = 0x2c,
 398                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 399                 [BQ27XXX_REG_AP] = 0x24,
 400         },
 401         [BQ27421] = {
 402                 [BQ27XXX_REG_CTRL] = 0x00,
 403                 [BQ27XXX_REG_TEMP] = 0x02,
 404                 [BQ27XXX_REG_INT_TEMP] = 0x1e,
 405                 [BQ27XXX_REG_VOLT] = 0x04,
 406                 [BQ27XXX_REG_AI] = 0x10,
 407                 [BQ27XXX_REG_FLAGS] = 0x06,
 408                 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
 409                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 410                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 411                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 412                 [BQ27XXX_REG_NAC] = 0x08,
 413                 [BQ27XXX_REG_FCC] = 0x0e,
 414                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 415                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 416                 [BQ27XXX_REG_SOC] = 0x1c,
 417                 [BQ27XXX_REG_DCAP] = 0x3c,
 418                 [BQ27XXX_REG_AP] = 0x18,
 419         },
 420 };
 421
 422 static enum power_supply_property bq27000_battery_props[] = {
 423         POWER_SUPPLY_PROP_STATUS,
 424         POWER_SUPPLY_PROP_PRESENT,
 425         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 426         POWER_SUPPLY_PROP_CURRENT_NOW,
 427         POWER_SUPPLY_PROP_CAPACITY,
 428         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 429         POWER_SUPPLY_PROP_TEMP,
 430         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 431         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 432         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 433         POWER_SUPPLY_PROP_TECHNOLOGY,
 434         POWER_SUPPLY_PROP_CHARGE_FULL,
 435         POWER_SUPPLY_PROP_CHARGE_NOW,
 436         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 437         POWER_SUPPLY_PROP_CYCLE_COUNT,
 438         POWER_SUPPLY_PROP_ENERGY_NOW,
 439         POWER_SUPPLY_PROP_POWER_AVG,
 440         POWER_SUPPLY_PROP_HEALTH,
 441         POWER_SUPPLY_PROP_MANUFACTURER,
 442 };
 443
 444 static enum power_supply_property bq27010_battery_props[] = {
 445         POWER_SUPPLY_PROP_STATUS,
 446         POWER_SUPPLY_PROP_PRESENT,
 447         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 448         POWER_SUPPLY_PROP_CURRENT_NOW,
 449         POWER_SUPPLY_PROP_CAPACITY,
 450         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 451         POWER_SUPPLY_PROP_TEMP,
 452         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 453         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 454         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 455         POWER_SUPPLY_PROP_TECHNOLOGY,
 456         POWER_SUPPLY_PROP_CHARGE_FULL,
 457         POWER_SUPPLY_PROP_CHARGE_NOW,
 458         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 459         POWER_SUPPLY_PROP_CYCLE_COUNT,
 460         POWER_SUPPLY_PROP_HEALTH,
 461         POWER_SUPPLY_PROP_MANUFACTURER,
 462 };
 463
 464 static enum power_supply_property bq2750x_battery_props[] = {
 465         POWER_SUPPLY_PROP_STATUS,
 466         POWER_SUPPLY_PROP_PRESENT,
 467         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 468         POWER_SUPPLY_PROP_CURRENT_NOW,
 469         POWER_SUPPLY_PROP_CAPACITY,
 470         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 471         POWER_SUPPLY_PROP_TEMP,
 472         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 473         POWER_SUPPLY_PROP_TECHNOLOGY,
 474         POWER_SUPPLY_PROP_CHARGE_FULL,
 475         POWER_SUPPLY_PROP_CHARGE_NOW,
 476         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 477         POWER_SUPPLY_PROP_CYCLE_COUNT,
 478         POWER_SUPPLY_PROP_HEALTH,
 479         POWER_SUPPLY_PROP_MANUFACTURER,
 480 };
 481
 482 static enum power_supply_property bq2751x_battery_props[] = {
 483         POWER_SUPPLY_PROP_STATUS,
 484         POWER_SUPPLY_PROP_PRESENT,
 485         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 486         POWER_SUPPLY_PROP_CURRENT_NOW,
 487         POWER_SUPPLY_PROP_CAPACITY,
 488         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 489         POWER_SUPPLY_PROP_TEMP,
 490         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 491         POWER_SUPPLY_PROP_TECHNOLOGY,
 492         POWER_SUPPLY_PROP_CHARGE_FULL,
 493         POWER_SUPPLY_PROP_CHARGE_NOW,
 494         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 495         POWER_SUPPLY_PROP_CYCLE_COUNT,
 496         POWER_SUPPLY_PROP_HEALTH,
 497         POWER_SUPPLY_PROP_MANUFACTURER,
 498 };
 499
 500 static enum power_supply_property bq27500_battery_props[] = {
 501         POWER_SUPPLY_PROP_STATUS,
 502         POWER_SUPPLY_PROP_PRESENT,
 503         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 504         POWER_SUPPLY_PROP_CURRENT_NOW,
 505         POWER_SUPPLY_PROP_CAPACITY,
 506         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 507         POWER_SUPPLY_PROP_TEMP,
 508         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 509         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 510         POWER_SUPPLY_PROP_TECHNOLOGY,
 511         POWER_SUPPLY_PROP_CHARGE_FULL,
 512         POWER_SUPPLY_PROP_CHARGE_NOW,
 513         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 514         POWER_SUPPLY_PROP_CYCLE_COUNT,
 515         POWER_SUPPLY_PROP_ENERGY_NOW,
 516         POWER_SUPPLY_PROP_POWER_AVG,
 517         POWER_SUPPLY_PROP_HEALTH,
 518         POWER_SUPPLY_PROP_MANUFACTURER,
 519 };
 520
 521 static enum power_supply_property bq27510g1_battery_props[] = {
 522         POWER_SUPPLY_PROP_STATUS,
 523         POWER_SUPPLY_PROP_PRESENT,
 524         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 525         POWER_SUPPLY_PROP_CURRENT_NOW,
 526         POWER_SUPPLY_PROP_CAPACITY,
 527         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 528         POWER_SUPPLY_PROP_TEMP,
 529         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 530         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 531         POWER_SUPPLY_PROP_TECHNOLOGY,
 532         POWER_SUPPLY_PROP_CHARGE_FULL,
 533         POWER_SUPPLY_PROP_CHARGE_NOW,
 534         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 535         POWER_SUPPLY_PROP_CYCLE_COUNT,
 536         POWER_SUPPLY_PROP_ENERGY_NOW,
 537         POWER_SUPPLY_PROP_POWER_AVG,
 538         POWER_SUPPLY_PROP_HEALTH,
 539         POWER_SUPPLY_PROP_MANUFACTURER,
 540 };
 541
 542 static enum power_supply_property bq27510g2_battery_props[] = {
 543         POWER_SUPPLY_PROP_STATUS,
 544         POWER_SUPPLY_PROP_PRESENT,
 545         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 546         POWER_SUPPLY_PROP_CURRENT_NOW,
 547         POWER_SUPPLY_PROP_CAPACITY,
 548         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 549         POWER_SUPPLY_PROP_TEMP,
 550         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 551         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 552         POWER_SUPPLY_PROP_TECHNOLOGY,
 553         POWER_SUPPLY_PROP_CHARGE_FULL,
 554         POWER_SUPPLY_PROP_CHARGE_NOW,
 555         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 556         POWER_SUPPLY_PROP_CYCLE_COUNT,
 557         POWER_SUPPLY_PROP_ENERGY_NOW,
 558         POWER_SUPPLY_PROP_POWER_AVG,
 559         POWER_SUPPLY_PROP_HEALTH,
 560         POWER_SUPPLY_PROP_MANUFACTURER,
 561 };
 562
 563 static enum power_supply_property bq27510g3_battery_props[] = {
 564         POWER_SUPPLY_PROP_STATUS,
 565         POWER_SUPPLY_PROP_PRESENT,
 566         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 567         POWER_SUPPLY_PROP_CURRENT_NOW,
 568         POWER_SUPPLY_PROP_CAPACITY,
 569         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 570         POWER_SUPPLY_PROP_TEMP,
 571         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 572         POWER_SUPPLY_PROP_TECHNOLOGY,
 573         POWER_SUPPLY_PROP_CHARGE_FULL,
 574         POWER_SUPPLY_PROP_CHARGE_NOW,
 575         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 576         POWER_SUPPLY_PROP_CYCLE_COUNT,
 577         POWER_SUPPLY_PROP_HEALTH,
 578         POWER_SUPPLY_PROP_MANUFACTURER,
 579 };
 580
 581 static enum power_supply_property bq27520g1_battery_props[] = {
 582         POWER_SUPPLY_PROP_STATUS,
 583         POWER_SUPPLY_PROP_PRESENT,
 584         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 585         POWER_SUPPLY_PROP_CURRENT_NOW,
 586         POWER_SUPPLY_PROP_CAPACITY,
 587         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 588         POWER_SUPPLY_PROP_TEMP,
 589         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 590         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 591         POWER_SUPPLY_PROP_TECHNOLOGY,
 592         POWER_SUPPLY_PROP_CHARGE_FULL,
 593         POWER_SUPPLY_PROP_CHARGE_NOW,
 594         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 595         POWER_SUPPLY_PROP_ENERGY_NOW,
 596         POWER_SUPPLY_PROP_POWER_AVG,
 597         POWER_SUPPLY_PROP_HEALTH,
 598         POWER_SUPPLY_PROP_MANUFACTURER,
 599 };
 600
 601 static enum power_supply_property bq27520g2_battery_props[] = {
 602         POWER_SUPPLY_PROP_STATUS,
 603         POWER_SUPPLY_PROP_PRESENT,
 604         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 605         POWER_SUPPLY_PROP_CURRENT_NOW,
 606         POWER_SUPPLY_PROP_CAPACITY,
 607         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 608         POWER_SUPPLY_PROP_TEMP,
 609         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 610         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 611         POWER_SUPPLY_PROP_TECHNOLOGY,
 612         POWER_SUPPLY_PROP_CHARGE_FULL,
 613         POWER_SUPPLY_PROP_CHARGE_NOW,
 614         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 615         POWER_SUPPLY_PROP_CYCLE_COUNT,
 616         POWER_SUPPLY_PROP_ENERGY_NOW,
 617         POWER_SUPPLY_PROP_POWER_AVG,
 618         POWER_SUPPLY_PROP_HEALTH,
 619         POWER_SUPPLY_PROP_MANUFACTURER,
 620 };
 621
 622 static enum power_supply_property bq27520g3_battery_props[] = {
 623         POWER_SUPPLY_PROP_STATUS,
 624         POWER_SUPPLY_PROP_PRESENT,
 625         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 626         POWER_SUPPLY_PROP_CURRENT_NOW,
 627         POWER_SUPPLY_PROP_CAPACITY,
 628         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 629         POWER_SUPPLY_PROP_TEMP,
 630         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 631         POWER_SUPPLY_PROP_TECHNOLOGY,
 632         POWER_SUPPLY_PROP_CHARGE_FULL,
 633         POWER_SUPPLY_PROP_CHARGE_NOW,
 634         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 635         POWER_SUPPLY_PROP_CYCLE_COUNT,
 636         POWER_SUPPLY_PROP_ENERGY_NOW,
 637         POWER_SUPPLY_PROP_POWER_AVG,
 638         POWER_SUPPLY_PROP_HEALTH,
 639         POWER_SUPPLY_PROP_MANUFACTURER,
 640 };
 641
 642 static enum power_supply_property bq27520g4_battery_props[] = {
 643         POWER_SUPPLY_PROP_STATUS,
 644         POWER_SUPPLY_PROP_PRESENT,
 645         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 646         POWER_SUPPLY_PROP_CURRENT_NOW,
 647         POWER_SUPPLY_PROP_CAPACITY,
 648         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 649         POWER_SUPPLY_PROP_TEMP,
 650         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 651         POWER_SUPPLY_PROP_TECHNOLOGY,
 652         POWER_SUPPLY_PROP_CHARGE_FULL,
 653         POWER_SUPPLY_PROP_CHARGE_NOW,
 654         POWER_SUPPLY_PROP_CYCLE_COUNT,
 655         POWER_SUPPLY_PROP_HEALTH,
 656         POWER_SUPPLY_PROP_MANUFACTURER,
 657 };
 658
 659 static enum power_supply_property bq27530_battery_props[] = {
 660         POWER_SUPPLY_PROP_STATUS,
 661         POWER_SUPPLY_PROP_PRESENT,
 662         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 663         POWER_SUPPLY_PROP_CURRENT_NOW,
 664         POWER_SUPPLY_PROP_CAPACITY,
 665         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 666         POWER_SUPPLY_PROP_TEMP,
 667         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 668         POWER_SUPPLY_PROP_TECHNOLOGY,
 669         POWER_SUPPLY_PROP_CHARGE_FULL,
 670         POWER_SUPPLY_PROP_CHARGE_NOW,
 671         POWER_SUPPLY_PROP_POWER_AVG,
 672         POWER_SUPPLY_PROP_HEALTH,
 673         POWER_SUPPLY_PROP_CYCLE_COUNT,
 674         POWER_SUPPLY_PROP_MANUFACTURER,
 675 };
 676
 677 static enum power_supply_property bq27541_battery_props[] = {
 678         POWER_SUPPLY_PROP_STATUS,
 679         POWER_SUPPLY_PROP_PRESENT,
 680         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 681         POWER_SUPPLY_PROP_CURRENT_NOW,
 682         POWER_SUPPLY_PROP_CAPACITY,
 683         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 684         POWER_SUPPLY_PROP_TEMP,
 685         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 686         POWER_SUPPLY_PROP_TECHNOLOGY,
 687         POWER_SUPPLY_PROP_CHARGE_FULL,
 688         POWER_SUPPLY_PROP_CHARGE_NOW,
 689         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 690         POWER_SUPPLY_PROP_CYCLE_COUNT,
 691         POWER_SUPPLY_PROP_POWER_AVG,
 692         POWER_SUPPLY_PROP_HEALTH,
 693         POWER_SUPPLY_PROP_MANUFACTURER,
 694 };
 695
 696 static enum power_supply_property bq27545_battery_props[] = {
 697         POWER_SUPPLY_PROP_STATUS,
 698         POWER_SUPPLY_PROP_PRESENT,
 699         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 700         POWER_SUPPLY_PROP_CURRENT_NOW,
 701         POWER_SUPPLY_PROP_CAPACITY,
 702         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 703         POWER_SUPPLY_PROP_TEMP,
 704         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 705         POWER_SUPPLY_PROP_TECHNOLOGY,
 706         POWER_SUPPLY_PROP_CHARGE_FULL,
 707         POWER_SUPPLY_PROP_CHARGE_NOW,
 708         POWER_SUPPLY_PROP_HEALTH,
 709         POWER_SUPPLY_PROP_CYCLE_COUNT,
 710         POWER_SUPPLY_PROP_POWER_AVG,
 711         POWER_SUPPLY_PROP_MANUFACTURER,
 712 };
 713
 714 static enum power_supply_property bq27421_battery_props[] = {
 715         POWER_SUPPLY_PROP_STATUS,
 716         POWER_SUPPLY_PROP_PRESENT,
 717         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 718         POWER_SUPPLY_PROP_CURRENT_NOW,
 719         POWER_SUPPLY_PROP_CAPACITY,
 720         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 721         POWER_SUPPLY_PROP_TEMP,
 722         POWER_SUPPLY_PROP_TECHNOLOGY,
 723         POWER_SUPPLY_PROP_CHARGE_FULL,
 724         POWER_SUPPLY_PROP_CHARGE_NOW,
 725         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 726         POWER_SUPPLY_PROP_MANUFACTURER,
 727 };
 728
 729 #define BQ27XXX_PROP(_id, _prop)                \
 730         [_id] = {                               \
 731                 .props = _prop,                 \
 732                 .size = ARRAY_SIZE(_prop),      \
 733         }
 734
 735 static struct {
 736         enum power_supply_property *props;
 737         size_t size;
 738 } bq27xxx_battery_props[] = {
 739         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
 740         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
 741         BQ27XXX_PROP(BQ2750X, bq2750x_battery_props),
 742         BQ27XXX_PROP(BQ2751X, bq2751x_battery_props),
 743         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
 744         BQ27XXX_PROP(BQ27510G1, bq27510g1_battery_props),
 745         BQ27XXX_PROP(BQ27510G2, bq27510g2_battery_props),
 746         BQ27XXX_PROP(BQ27510G3, bq27510g3_battery_props),
 747         BQ27XXX_PROP(BQ27520G1, bq27520g1_battery_props),
 748         BQ27XXX_PROP(BQ27520G2, bq27520g2_battery_props),
 749         BQ27XXX_PROP(BQ27520G3, bq27520g3_battery_props),
 750         BQ27XXX_PROP(BQ27520G4, bq27520g4_battery_props),
 751         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
 752         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
 753         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
 754         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
 755 };
 756
 757 static DEFINE_MUTEX(bq27xxx_list_lock);
 758 static LIST_HEAD(bq27xxx_battery_devices);
 759
 760 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
 761 {
 762         struct bq27xxx_device_info *di;
 763         unsigned int prev_val = *(unsigned int *) kp->arg;
 764         int ret;
 765
 766         ret = param_set_uint(val, kp);
 767         if (ret < 0 || prev_val == *(unsigned int *) kp->arg)
 768                 return ret;
 769
 770         mutex_lock(&bq27xxx_list_lock);
 771         list_for_each_entry(di, &bq27xxx_battery_devices, list) {
 772                 cancel_delayed_work_sync(&di->work);
 773                 schedule_delayed_work(&di->work, 0);
 774         }
 775         mutex_unlock(&bq27xxx_list_lock);
 776
 777         return ret;
 778 }
 779
 780 static const struct kernel_param_ops param_ops_poll_interval = {
 781         .get = param_get_uint,
 782         .set = poll_interval_param_set,
 783 };
 784
 785 static unsigned int poll_interval = 360;
 786 module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
 787 MODULE_PARM_DESC(poll_interval,
 788                  "battery poll interval in seconds - 0 disables polling");
 789
 790 /*
 791  * Common code for BQ27xxx devices
 792  */
 793
 794 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 795                                bool single)
 796 {
 797         /* Reports EINVAL for invalid/missing registers */
 798         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 799                 return -EINVAL;
 800
 801         return di->bus.read(di, di->regs[reg_index], single);
 802 }
 803
 804 /*
 805  * Return the battery State-of-Charge
 806  * Or < 0 if something fails.
 807  */
 808 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 809 {
 810         int soc;
 811
 812         if (di->chip == BQ27000 || di->chip == BQ27010)
 813                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
 814         else
 815                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 816
 817         if (soc < 0)
 818                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 819
 820         return soc;
 821 }
 822
 823 /*
 824  * Return a battery charge value in µAh
 825  * Or < 0 if something fails.
 826  */
 827 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 828 {
 829         int charge;
 830
 831         charge = bq27xxx_read(di, reg, false);
 832         if (charge < 0) {
 833                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 834                         reg, charge);
 835                 return charge;
 836         }
 837
 838         if (di->chip == BQ27000 || di->chip == BQ27010)
 839                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 840         else
 841                 charge *= 1000;
 842
 843         return charge;
 844 }
 845
 846 /*
 847  * Return the battery Nominal available capacity in µAh
 848  * Or < 0 if something fails.
 849  */
 850 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 851 {
 852         int flags;
 853
 854         if (di->chip == BQ27000 || di->chip == BQ27010) {
 855                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 856                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 857                         return -ENODATA;
 858         }
 859
 860         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 861 }
 862
 863 /*
 864  * Return the battery Full Charge Capacity in µAh
 865  * Or < 0 if something fails.
 866  */
 867 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 868 {
 869         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 870 }
 871
 872 /*
 873  * Return the Design Capacity in µAh
 874  * Or < 0 if something fails.
 875  */
 876 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 877 {
 878         int dcap;
 879
 880         if (di->chip == BQ27000 || di->chip == BQ27010)
 881                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
 882         else
 883                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 884
 885         if (dcap < 0) {
 886                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 887                 return dcap;
 888         }
 889
 890         if (di->chip == BQ27000 || di->chip == BQ27010)
 891                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 892         else
 893                 dcap *= 1000;
 894
 895         return dcap;
 896 }
 897
 898 /*
 899  * Return the battery Available energy in µWh
 900  * Or < 0 if something fails.
 901  */
 902 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 903 {
 904         int ae;
 905
 906         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 907         if (ae < 0) {
 908                 dev_dbg(di->dev, "error reading available energy\n");
 909                 return ae;
 910         }
 911
 912         if (di->chip == BQ27000 || di->chip == BQ27010)
 913                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 914         else
 915                 ae *= 1000;
 916
 917         return ae;
 918 }
 919
 920 /*
 921  * Return the battery temperature in tenths of degree Kelvin
 922  * Or < 0 if something fails.
 923  */
 924 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 925 {
 926         int temp;
 927
 928         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 929         if (temp < 0) {
 930                 dev_err(di->dev, "error reading temperature\n");
 931                 return temp;
 932         }
 933
 934         if (di->chip == BQ27000 || di->chip == BQ27010)
 935                 temp = 5 * temp / 2;
 936
 937         return temp;
 938 }
 939
 940 /*
 941  * Return the battery Cycle count total
 942  * Or < 0 if something fails.
 943  */
 944 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 945 {
 946         int cyct;
 947
 948         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 949         if (cyct < 0)
 950                 dev_err(di->dev, "error reading cycle count total\n");
 951
 952         return cyct;
 953 }
 954
 955 /*
 956  * Read a time register.
 957  * Return < 0 if something fails.
 958  */
 959 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 960 {
 961         int tval;
 962
 963         tval = bq27xxx_read(di, reg, false);
 964         if (tval < 0) {
 965                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 966                         reg, tval);
 967                 return tval;
 968         }
 969
 970         if (tval == 65535)
 971                 return -ENODATA;
 972
 973         return tval * 60;
 974 }
 975
 976 /*
 977  * Read an average power register.
 978  * Return < 0 if something fails.
 979  */
 980 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 981 {
 982         int tval;
 983
 984         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 985         if (tval < 0) {
 986                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 987                         BQ27XXX_REG_AP, tval);
 988                 return tval;
 989         }
 990
 991         if (di->chip == BQ27000 || di->chip == BQ27010)
 992                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 993         else
 994                 return tval;
 995 }
 996
 997 /*
 998  * Returns true if a battery over temperature condition is detected
 999  */
1000 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
1001 {
1002         switch (di->chip) {
1003         case BQ2750X:
1004         case BQ2751X:
1005         case BQ27500:
1006         case BQ27510G1:
1007         case BQ27510G2:
1008         case BQ27510G3:
1009         case BQ27520G1:
1010         case BQ27520G2:
1011         case BQ27520G3:
1012         case BQ27520G4:
1013         case BQ27541:
1014         case BQ27545:
1015                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
1016         case BQ27530:
1017         case BQ27421:
1018                 return flags & BQ27XXX_FLAG_OT;
1019         default:
1020                 return false;
1021         }
1022 }
1023
1024 /*
1025  * Returns true if a battery under temperature condition is detected
1026  */
1027 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
1028 {
1029         if (di->chip == BQ27530 || di->chip == BQ27421)
1030                 return flags & BQ27XXX_FLAG_UT;
1031
1032         return false;
1033 }
1034
1035 /*
1036  * Returns true if a low state of charge condition is detected
1037  */
1038 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
1039 {
1040         if (di->chip == BQ27000 || di->chip == BQ27010)
1041                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
1042         else
1043                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
1044 }
1045
1046 /*
1047  * Read flag register.
1048  * Return < 0 if something fails.
1049  */
1050 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
1051 {
1052         int flags;
1053         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
1054
1055         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
1056         if (flags < 0) {
1057                 dev_err(di->dev, "error reading flag register:%d\n", flags);
1058                 return flags;
1059         }
1060
1061         /* Unlikely but important to return first */
1062         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
1063                 return POWER_SUPPLY_HEALTH_OVERHEAT;
1064         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
1065                 return POWER_SUPPLY_HEALTH_COLD;
1066         if (unlikely(bq27xxx_battery_dead(di, flags)))
1067                 return POWER_SUPPLY_HEALTH_DEAD;
1068
1069         return POWER_SUPPLY_HEALTH_GOOD;
1070 }
1071
1072 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
1073 {
1074         struct bq27xxx_reg_cache cache = {0, };
1075         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
1076         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
1077
1078         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
1079         if ((cache.flags & 0xff) == 0xff)
1080                 cache.flags = -1; /* read error */
1081         if (cache.flags >= 0) {
1082                 cache.temperature = bq27xxx_battery_read_temperature(di);
1083                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
1084                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
1085                         cache.capacity = -ENODATA;
1086                         cache.energy = -ENODATA;
1087                         cache.time_to_empty = -ENODATA;
1088                         cache.time_to_empty_avg = -ENODATA;
1089                         cache.time_to_full = -ENODATA;
1090                         cache.charge_full = -ENODATA;
1091                         cache.health = -ENODATA;
1092                 } else {
1093                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
1094                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
1095                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
1096                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
1097                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
1098                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
1099                         cache.charge_full = bq27xxx_battery_read_fcc(di);
1100                         cache.capacity = bq27xxx_battery_read_soc(di);
1101                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
1102                                 cache.energy = bq27xxx_battery_read_energy(di);
1103                         cache.health = bq27xxx_battery_read_health(di);
1104                 }
1105                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
1106                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
1107                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
1108                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
1109
1110                 /* We only have to read charge design full once */
1111                 if (di->charge_design_full <= 0)
1112                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
1113         }
1114
1115         if (di->cache.capacity != cache.capacity)
1116                 power_supply_changed(di->bat);
1117
1118         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
1119                 di->cache = cache;
1120
1121         di->last_update = jiffies;
1122 }
1123 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
1124
1125 static void bq27xxx_battery_poll(struct work_struct *work)
1126 {
1127         struct bq27xxx_device_info *di =
1128                         container_of(work, struct bq27xxx_device_info,
1129                                      work.work);
1130
1131         bq27xxx_battery_update(di);
1132
1133         if (poll_interval > 0)
1134                 schedule_delayed_work(&di->work, poll_interval * HZ);
1135 }
1136
1137 /*
1138  * Return the battery average current in µA
1139  * Note that current can be negative signed as well
1140  * Or 0 if something fails.
1141  */
1142 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
1143                                    union power_supply_propval *val)
1144 {
1145         int curr;
1146         int flags;
1147
1148         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
1149         if (curr < 0) {
1150                 dev_err(di->dev, "error reading current\n");
1151                 return curr;
1152         }
1153
1154         if (di->chip == BQ27000 || di->chip == BQ27010) {
1155                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
1156                 if (flags & BQ27000_FLAG_CHGS) {
1157                         dev_dbg(di->dev, "negative current!\n");
1158                         curr = -curr;
1159                 }
1160
1161                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
1162         } else {
1163                 /* Other gauges return signed value */
1164                 val->intval = (int)((s16)curr) * 1000;
1165         }
1166
1167         return 0;
1168 }
1169
1170 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
1171                                   union power_supply_propval *val)
1172 {
1173         int status;
1174
1175         if (di->chip == BQ27000 || di->chip == BQ27010) {
1176                 if (di->cache.flags & BQ27000_FLAG_FC)
1177                         status = POWER_SUPPLY_STATUS_FULL;
1178                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
1179                         status = POWER_SUPPLY_STATUS_CHARGING;
1180                 else if (power_supply_am_i_supplied(di->bat))
1181                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1182                 else
1183                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1184         } else {
1185                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1186                         status = POWER_SUPPLY_STATUS_FULL;
1187                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
1188                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1189                 else
1190                         status = POWER_SUPPLY_STATUS_CHARGING;
1191         }
1192
1193         val->intval = status;
1194
1195         return 0;
1196 }
1197
1198 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
1199                                           union power_supply_propval *val)
1200 {
1201         int level;
1202
1203         if (di->chip == BQ27000 || di->chip == BQ27010) {
1204                 if (di->cache.flags & BQ27000_FLAG_FC)
1205                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1206                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
1207                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1208                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
1209                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1210                 else
1211                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1212         } else {
1213                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1214                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1215                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
1216                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1217                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
1218                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1219                 else
1220                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1221         }
1222
1223         val->intval = level;
1224
1225         return 0;
1226 }
1227
1228 /*
1229  * Return the battery Voltage in millivolts
1230  * Or < 0 if something fails.
1231  */
1232 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
1233                                    union power_supply_propval *val)
1234 {
1235         int volt;
1236
1237         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
1238         if (volt < 0) {
1239                 dev_err(di->dev, "error reading voltage\n");
1240                 return volt;
1241         }
1242
1243         val->intval = volt * 1000;
1244
1245         return 0;
1246 }
1247
1248 static int bq27xxx_simple_value(int value,
1249                                 union power_supply_propval *val)
1250 {
1251         if (value < 0)
1252                 return value;
1253
1254         val->intval = value;
1255
1256         return 0;
1257 }
1258
1259 static int bq27xxx_battery_get_property(struct power_supply *psy,
1260                                         enum power_supply_property psp,
1261                                         union power_supply_propval *val)
1262 {
1263         int ret = 0;
1264         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1265
1266         mutex_lock(&di->lock);
1267         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
1268                 cancel_delayed_work_sync(&di->work);
1269                 bq27xxx_battery_poll(&di->work.work);
1270         }
1271         mutex_unlock(&di->lock);
1272
1273         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
1274                 return -ENODEV;
1275
1276         switch (psp) {
1277         case POWER_SUPPLY_PROP_STATUS:
1278                 ret = bq27xxx_battery_status(di, val);
1279                 break;
1280         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1281                 ret = bq27xxx_battery_voltage(di, val);
1282                 break;
1283         case POWER_SUPPLY_PROP_PRESENT:
1284                 val->intval = di->cache.flags < 0 ? 0 : 1;
1285                 break;
1286         case POWER_SUPPLY_PROP_CURRENT_NOW:
1287                 ret = bq27xxx_battery_current(di, val);
1288                 break;
1289         case POWER_SUPPLY_PROP_CAPACITY:
1290                 ret = bq27xxx_simple_value(di->cache.capacity, val);
1291                 break;
1292         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1293                 ret = bq27xxx_battery_capacity_level(di, val);
1294                 break;
1295         case POWER_SUPPLY_PROP_TEMP:
1296                 ret = bq27xxx_simple_value(di->cache.temperature, val);
1297                 if (ret == 0)
1298                         val->intval -= 2731; /* convert decidegree k to c */
1299                 break;
1300         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
1301                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
1302                 break;
1303         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
1304                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
1305                 break;
1306         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
1307                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
1308                 break;
1309         case POWER_SUPPLY_PROP_TECHNOLOGY:
1310                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
1311                 break;
1312         case POWER_SUPPLY_PROP_CHARGE_NOW:
1313                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
1314                 break;
1315         case POWER_SUPPLY_PROP_CHARGE_FULL:
1316                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
1317                 break;
1318         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1319                 ret = bq27xxx_simple_value(di->charge_design_full, val);
1320                 break;
1321         case POWER_SUPPLY_PROP_CYCLE_COUNT:
1322                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
1323                 break;
1324         case POWER_SUPPLY_PROP_ENERGY_NOW:
1325                 ret = bq27xxx_simple_value(di->cache.energy, val);
1326                 break;
1327         case POWER_SUPPLY_PROP_POWER_AVG:
1328                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
1329                 break;
1330         case POWER_SUPPLY_PROP_HEALTH:
1331                 ret = bq27xxx_simple_value(di->cache.health, val);
1332                 break;
1333         case POWER_SUPPLY_PROP_MANUFACTURER:
1334                 val->strval = BQ27XXX_MANUFACTURER;
1335                 break;
1336         default:
1337                 return -EINVAL;
1338         }
1339
1340         return ret;
1341 }
1342
1343 static void bq27xxx_external_power_changed(struct power_supply *psy)
1344 {
1345         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1346
1347         cancel_delayed_work_sync(&di->work);
1348         schedule_delayed_work(&di->work, 0);
1349 }
1350
1351 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1352 {
1353         struct power_supply_desc *psy_desc;
1354         struct power_supply_config psy_cfg = { .drv_data = di, };
1355
1356         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1357         mutex_init(&di->lock);
1358         di->regs = bq27xxx_regs[di->chip];
1359
1360         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1361         if (!psy_desc)
1362                 return -ENOMEM;
1363
1364         psy_desc->name = di->name;
1365         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1366         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
1367         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
1368         psy_desc->get_property = bq27xxx_battery_get_property;
1369         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1370
1371         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1372         if (IS_ERR(di->bat)) {
1373                 dev_err(di->dev, "failed to register battery\n");
1374                 return PTR_ERR(di->bat);
1375         }
1376
1377         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1378
1379         bq27xxx_battery_update(di);
1380
1381         mutex_lock(&bq27xxx_list_lock);
1382         list_add(&di->list, &bq27xxx_battery_devices);
1383         mutex_unlock(&bq27xxx_list_lock);
1384
1385         return 0;
1386 }
1387 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1388
1389 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1390 {
1391         /*
1392          * power_supply_unregister call bq27xxx_battery_get_property which
1393          * call bq27xxx_battery_poll.
1394          * Make sure that bq27xxx_battery_poll will not call
1395          * schedule_delayed_work again after unregister (which cause OOPS).
1396          */
1397         poll_interval = 0;
1398
1399         cancel_delayed_work_sync(&di->work);
1400
1401         power_supply_unregister(di->bat);
1402
1403         mutex_lock(&bq27xxx_list_lock);
1404         list_del(&di->list);
1405         mutex_unlock(&bq27xxx_list_lock);
1406
1407         mutex_destroy(&di->lock);
1408 }
1409 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1410
1411 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1412                                          bool single)
1413 {
1414         struct device *dev = di->dev;
1415         struct bq27xxx_platform_data *pdata = dev->platform_data;
1416         unsigned int timeout = 3;
1417         int upper, lower;
1418         int temp;
1419
1420         if (!single) {
1421                 /* Make sure the value has not changed in between reading the
1422                  * lower and the upper part */
1423                 upper = pdata->read(dev, reg + 1);
1424                 do {
1425                         temp = upper;
1426                         if (upper < 0)
1427                                 return upper;
1428
1429                         lower = pdata->read(dev, reg);
1430                         if (lower < 0)
1431                                 return lower;
1432
1433                         upper = pdata->read(dev, reg + 1);
1434                 } while (temp != upper && --timeout);
1435
1436                 if (timeout == 0)
1437                         return -EIO;
1438
1439                 return (upper << 8) | lower;
1440         }
1441
1442         return pdata->read(dev, reg);
1443 }
1444
1445 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1446 {
1447         struct bq27xxx_device_info *di;
1448         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1449
1450         if (!pdata) {
1451                 dev_err(&pdev->dev, "no platform_data supplied\n");
1452                 return -EINVAL;
1453         }
1454
1455         if (!pdata->read) {
1456                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1457                 return -EINVAL;
1458         }
1459
1460         if (!pdata->chip) {
1461                 dev_err(&pdev->dev, "no device supplied\n");
1462                 return -EINVAL;
1463         }
1464
1465         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1466         if (!di)
1467                 return -ENOMEM;
1468
1469         platform_set_drvdata(pdev, di);
1470
1471         di->dev = &pdev->dev;
1472         di->chip = pdata->chip;
1473         di->name = pdata->name ?: dev_name(&pdev->dev);
1474         di->bus.read = bq27xxx_battery_platform_read;
1475
1476         return bq27xxx_battery_setup(di);
1477 }
1478
1479 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1480 {
1481         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1482
1483         bq27xxx_battery_teardown(di);
1484
1485         return 0;
1486 }
1487
1488 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1489         { "bq27000-battery", },
1490         { /* sentinel */ }
1491 };
1492 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1493
1494 #ifdef CONFIG_OF
1495 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1496         { .compatible = "ti,bq27000" },
1497         {},
1498 };
1499 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1500 #endif
1501
1502 static struct platform_driver bq27xxx_battery_platform_driver = {
1503         .probe  = bq27xxx_battery_platform_probe,
1504         .remove = bq27xxx_battery_platform_remove,
1505         .driver = {
1506                 .name = "bq27000-battery",
1507                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1508         },
1509         .id_table = bq27xxx_battery_platform_id_table,
1510 };
1511 module_platform_driver(bq27xxx_battery_platform_driver);
1512
1513 MODULE_ALIAS("platform:bq27000-battery");
1514
1515 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1516 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1517 MODULE_LICENSE("GPL");