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/bq27530-g1
  32  * http://www.ti.com/product/bq27531-g1
  33  * http://www.ti.com/product/bq27541-g1
  34  * http://www.ti.com/product/bq27542-g1
  35  * http://www.ti.com/product/bq27546-g1
  36  * http://www.ti.com/product/bq27742-g1
  37  * http://www.ti.com/product/bq27545-g1
  38  * http://www.ti.com/product/bq27421-g1
  39  * http://www.ti.com/product/bq27425-g1
  40  * http://www.ti.com/product/bq27411-g1
  41  * http://www.ti.com/product/bq27621-g1
  42  */
  43
  44 #include <linux/device.h>
  45 #include <linux/module.h>
  46 #include <linux/mutex.h>
  47 #include <linux/param.h>
  48 #include <linux/jiffies.h>
  49 #include <linux/workqueue.h>
  50 #include <linux/delay.h>
  51 #include <linux/platform_device.h>
  52 #include <linux/power_supply.h>
  53 #include <linux/slab.h>
  54 #include <linux/of.h>
  55
  56 #include <linux/power/bq27xxx_battery.h>
  57
  58 #define DRIVER_VERSION          "1.2.0"
  59
  60 #define BQ27XXX_MANUFACTURER    "Texas Instruments"
  61
  62 /* BQ27XXX Flags */
  63 #define BQ27XXX_FLAG_DSC        BIT(0)
  64 #define BQ27XXX_FLAG_SOCF       BIT(1) /* State-of-Charge threshold final */
  65 #define BQ27XXX_FLAG_SOC1       BIT(2) /* State-of-Charge threshold 1 */
  66 #define BQ27XXX_FLAG_FC         BIT(9)
  67 #define BQ27XXX_FLAG_OTD        BIT(14)
  68 #define BQ27XXX_FLAG_OTC        BIT(15)
  69 #define BQ27XXX_FLAG_UT         BIT(14)
  70 #define BQ27XXX_FLAG_OT         BIT(15)
  71
  72 /* BQ27000 has different layout for Flags register */
  73 #define BQ27000_FLAG_EDVF       BIT(0) /* Final End-of-Discharge-Voltage flag */
  74 #define BQ27000_FLAG_EDV1       BIT(1) /* First End-of-Discharge-Voltage flag */
  75 #define BQ27000_FLAG_CI         BIT(4) /* Capacity Inaccurate flag */
  76 #define BQ27000_FLAG_FC         BIT(5)
  77 #define BQ27000_FLAG_CHGS       BIT(7) /* Charge state flag */
  78
  79 #define BQ27XXX_RS                      (20) /* Resistor sense mOhm */
  80 #define BQ27XXX_POWER_CONSTANT          (29200) /* 29.2 µV^2 * 1000 */
  81 #define BQ27XXX_CURRENT_CONSTANT        (3570) /* 3.57 µV * 1000 */
  82
  83 #define INVALID_REG_ADDR        0xff
  84
  85 /*
  86  * bq27xxx_reg_index - Register names
  87  *
  88  * These are indexes into a device's register mapping array.
  89  */
  90
  91 enum bq27xxx_reg_index {
  92         BQ27XXX_REG_CTRL = 0,   /* Control */
  93         BQ27XXX_REG_TEMP,       /* Temperature */
  94         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
  95         BQ27XXX_REG_VOLT,       /* Voltage */
  96         BQ27XXX_REG_AI,         /* Average Current */
  97         BQ27XXX_REG_FLAGS,      /* Flags */
  98         BQ27XXX_REG_TTE,        /* Time-to-Empty */
  99         BQ27XXX_REG_TTF,        /* Time-to-Full */
 100         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
 101         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
 102         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
 103         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
 104         BQ27XXX_REG_CYCT,       /* Cycle Count */
 105         BQ27XXX_REG_AE,         /* Available Energy */
 106         BQ27XXX_REG_SOC,        /* State-of-Charge */
 107         BQ27XXX_REG_DCAP,       /* Design Capacity */
 108         BQ27XXX_REG_AP,         /* Average Power */
 109         BQ27XXX_REG_MAX,        /* sentinel */
 110 };
 111
 112 /* Register mappings */
 113 static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 114         [BQ27000] = {
 115                 [BQ27XXX_REG_CTRL] = 0x00,
 116                 [BQ27XXX_REG_TEMP] = 0x06,
 117                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 118                 [BQ27XXX_REG_VOLT] = 0x08,
 119                 [BQ27XXX_REG_AI] = 0x14,
 120                 [BQ27XXX_REG_FLAGS] = 0x0a,
 121                 [BQ27XXX_REG_TTE] = 0x16,
 122                 [BQ27XXX_REG_TTF] = 0x18,
 123                 [BQ27XXX_REG_TTES] = 0x1c,
 124                 [BQ27XXX_REG_TTECP] = 0x26,
 125                 [BQ27XXX_REG_NAC] = 0x0c,
 126                 [BQ27XXX_REG_FCC] = 0x12,
 127                 [BQ27XXX_REG_CYCT] = 0x2a,
 128                 [BQ27XXX_REG_AE] = 0x22,
 129                 [BQ27XXX_REG_SOC] = 0x0b,
 130                 [BQ27XXX_REG_DCAP] = 0x76,
 131                 [BQ27XXX_REG_AP] = 0x24,
 132         },
 133         [BQ27010] = {
 134                 [BQ27XXX_REG_CTRL] = 0x00,
 135                 [BQ27XXX_REG_TEMP] = 0x06,
 136                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 137                 [BQ27XXX_REG_VOLT] = 0x08,
 138                 [BQ27XXX_REG_AI] = 0x14,
 139                 [BQ27XXX_REG_FLAGS] = 0x0a,
 140                 [BQ27XXX_REG_TTE] = 0x16,
 141                 [BQ27XXX_REG_TTF] = 0x18,
 142                 [BQ27XXX_REG_TTES] = 0x1c,
 143                 [BQ27XXX_REG_TTECP] = 0x26,
 144                 [BQ27XXX_REG_NAC] = 0x0c,
 145                 [BQ27XXX_REG_FCC] = 0x12,
 146                 [BQ27XXX_REG_CYCT] = 0x2a,
 147                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 148                 [BQ27XXX_REG_SOC] = 0x0b,
 149                 [BQ27XXX_REG_DCAP] = 0x76,
 150                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 151         },
 152         [BQ2750X] = {
 153                 [BQ27XXX_REG_CTRL] = 0x00,
 154                 [BQ27XXX_REG_TEMP] = 0x06,
 155                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 156                 [BQ27XXX_REG_VOLT] = 0x08,
 157                 [BQ27XXX_REG_AI] = 0x14,
 158                 [BQ27XXX_REG_FLAGS] = 0x0a,
 159                 [BQ27XXX_REG_TTE] = 0x16,
 160                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 161                 [BQ27XXX_REG_TTES] = 0x1a,
 162                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 163                 [BQ27XXX_REG_NAC] = 0x0c,
 164                 [BQ27XXX_REG_FCC] = 0x12,
 165                 [BQ27XXX_REG_CYCT] = 0x2a,
 166                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 167                 [BQ27XXX_REG_SOC] = 0x2c,
 168                 [BQ27XXX_REG_DCAP] = 0x3c,
 169                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 170         },
 171         [BQ2751X] = {
 172                 [BQ27XXX_REG_CTRL] = 0x00,
 173                 [BQ27XXX_REG_TEMP] = 0x06,
 174                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 175                 [BQ27XXX_REG_VOLT] = 0x08,
 176                 [BQ27XXX_REG_AI] = 0x14,
 177                 [BQ27XXX_REG_FLAGS] = 0x0a,
 178                 [BQ27XXX_REG_TTE] = 0x16,
 179                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 180                 [BQ27XXX_REG_TTES] = 0x1a,
 181                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 182                 [BQ27XXX_REG_NAC] = 0x0c,
 183                 [BQ27XXX_REG_FCC] = 0x12,
 184                 [BQ27XXX_REG_CYCT] = 0x1e,
 185                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 186                 [BQ27XXX_REG_SOC] = 0x20,
 187                 [BQ27XXX_REG_DCAP] = 0x2e,
 188                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 189         },
 190         [BQ27500] = {
 191                 [BQ27XXX_REG_CTRL] = 0x00,
 192                 [BQ27XXX_REG_TEMP] = 0x06,
 193                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 194                 [BQ27XXX_REG_VOLT] = 0x08,
 195                 [BQ27XXX_REG_AI] = 0x14,
 196                 [BQ27XXX_REG_FLAGS] = 0x0a,
 197                 [BQ27XXX_REG_TTE] = 0x16,
 198                 [BQ27XXX_REG_TTF] = 0x18,
 199                 [BQ27XXX_REG_TTES] = 0x1c,
 200                 [BQ27XXX_REG_TTECP] = 0x26,
 201                 [BQ27XXX_REG_NAC] = 0x0c,
 202                 [BQ27XXX_REG_FCC] = 0x12,
 203                 [BQ27XXX_REG_CYCT] = 0x2a,
 204                 [BQ27XXX_REG_AE] = 0x22,
 205                 [BQ27XXX_REG_SOC] = 0x2c,
 206                 [BQ27XXX_REG_DCAP] = 0x3c,
 207                 [BQ27XXX_REG_AP] = 0x24,
 208         },
 209         [BQ27510G1] = {
 210                 [BQ27XXX_REG_CTRL] = 0x00,
 211                 [BQ27XXX_REG_TEMP] = 0x06,
 212                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 213                 [BQ27XXX_REG_VOLT] = 0x08,
 214                 [BQ27XXX_REG_AI] = 0x14,
 215                 [BQ27XXX_REG_FLAGS] = 0x0a,
 216                 [BQ27XXX_REG_TTE] = 0x16,
 217                 [BQ27XXX_REG_TTF] = 0x18,
 218                 [BQ27XXX_REG_TTES] = 0x1c,
 219                 [BQ27XXX_REG_TTECP] = 0x26,
 220                 [BQ27XXX_REG_NAC] = 0x0c,
 221                 [BQ27XXX_REG_FCC] = 0x12,
 222                 [BQ27XXX_REG_CYCT] = 0x2a,
 223                 [BQ27XXX_REG_AE] = 0x22,
 224                 [BQ27XXX_REG_SOC] = 0x2c,
 225                 [BQ27XXX_REG_DCAP] = 0x3c,
 226                 [BQ27XXX_REG_AP] = 0x24,
 227         },
 228         [BQ27510G2] = {
 229                 [BQ27XXX_REG_CTRL] = 0x00,
 230                 [BQ27XXX_REG_TEMP] = 0x06,
 231                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 232                 [BQ27XXX_REG_VOLT] = 0x08,
 233                 [BQ27XXX_REG_AI] = 0x14,
 234                 [BQ27XXX_REG_FLAGS] = 0x0a,
 235                 [BQ27XXX_REG_TTE] = 0x16,
 236                 [BQ27XXX_REG_TTF] = 0x18,
 237                 [BQ27XXX_REG_TTES] = 0x1c,
 238                 [BQ27XXX_REG_TTECP] = 0x26,
 239                 [BQ27XXX_REG_NAC] = 0x0c,
 240                 [BQ27XXX_REG_FCC] = 0x12,
 241                 [BQ27XXX_REG_CYCT] = 0x2a,
 242                 [BQ27XXX_REG_AE] = 0x22,
 243                 [BQ27XXX_REG_SOC] = 0x2c,
 244                 [BQ27XXX_REG_DCAP] = 0x3c,
 245                 [BQ27XXX_REG_AP] = 0x24,
 246         },
 247         [BQ27510G3] = {
 248                 [BQ27XXX_REG_CTRL] = 0x00,
 249                 [BQ27XXX_REG_TEMP] = 0x06,
 250                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 251                 [BQ27XXX_REG_VOLT] = 0x08,
 252                 [BQ27XXX_REG_AI] = 0x14,
 253                 [BQ27XXX_REG_FLAGS] = 0x0a,
 254                 [BQ27XXX_REG_TTE] = 0x16,
 255                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 256                 [BQ27XXX_REG_TTES] = 0x1a,
 257                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 258                 [BQ27XXX_REG_NAC] = 0x0c,
 259                 [BQ27XXX_REG_FCC] = 0x12,
 260                 [BQ27XXX_REG_CYCT] = 0x1e,
 261                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 262                 [BQ27XXX_REG_SOC] = 0x20,
 263                 [BQ27XXX_REG_DCAP] = 0x2e,
 264                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 265         },
 266         [BQ27520G1] = {
 267                 [BQ27XXX_REG_CTRL] = 0x00,
 268                 [BQ27XXX_REG_TEMP] = 0x06,
 269                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 270                 [BQ27XXX_REG_VOLT] = 0x08,
 271                 [BQ27XXX_REG_AI] = 0x14,
 272                 [BQ27XXX_REG_FLAGS] = 0x0a,
 273                 [BQ27XXX_REG_TTE] = 0x16,
 274                 [BQ27XXX_REG_TTF] = 0x18,
 275                 [BQ27XXX_REG_TTES] = 0x1c,
 276                 [BQ27XXX_REG_TTECP] = 0x26,
 277                 [BQ27XXX_REG_NAC] = 0x0c,
 278                 [BQ27XXX_REG_FCC] = 0x12,
 279                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 280                 [BQ27XXX_REG_AE] = 0x22,
 281                 [BQ27XXX_REG_SOC] = 0x2c,
 282                 [BQ27XXX_REG_DCAP] = 0x3c,
 283                 [BQ27XXX_REG_AP] = 0x24,
 284         },
 285         [BQ27520G2] = {
 286                 [BQ27XXX_REG_CTRL] = 0x00,
 287                 [BQ27XXX_REG_TEMP] = 0x06,
 288                 [BQ27XXX_REG_INT_TEMP] = 0x36,
 289                 [BQ27XXX_REG_VOLT] = 0x08,
 290                 [BQ27XXX_REG_AI] = 0x14,
 291                 [BQ27XXX_REG_FLAGS] = 0x0a,
 292                 [BQ27XXX_REG_TTE] = 0x16,
 293                 [BQ27XXX_REG_TTF] = 0x18,
 294                 [BQ27XXX_REG_TTES] = 0x1c,
 295                 [BQ27XXX_REG_TTECP] = 0x26,
 296                 [BQ27XXX_REG_NAC] = 0x0c,
 297                 [BQ27XXX_REG_FCC] = 0x12,
 298                 [BQ27XXX_REG_CYCT] = 0x2a,
 299                 [BQ27XXX_REG_AE] = 0x22,
 300                 [BQ27XXX_REG_SOC] = 0x2c,
 301                 [BQ27XXX_REG_DCAP] = 0x3c,
 302                 [BQ27XXX_REG_AP] = 0x24,
 303         },
 304         [BQ27530] = {
 305                 [BQ27XXX_REG_CTRL] = 0x00,
 306                 [BQ27XXX_REG_TEMP] = 0x06,
 307                 [BQ27XXX_REG_INT_TEMP] = 0x32,
 308                 [BQ27XXX_REG_VOLT] = 0x08,
 309                 [BQ27XXX_REG_AI] = 0x14,
 310                 [BQ27XXX_REG_FLAGS] = 0x0a,
 311                 [BQ27XXX_REG_TTE] = 0x16,
 312                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 313                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 314                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 315                 [BQ27XXX_REG_NAC] = 0x0c,
 316                 [BQ27XXX_REG_FCC] = 0x12,
 317                 [BQ27XXX_REG_CYCT] = 0x2a,
 318                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 319                 [BQ27XXX_REG_SOC] = 0x2c,
 320                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 321                 [BQ27XXX_REG_AP] = 0x24,
 322         },
 323         [BQ27541] = {
 324                 [BQ27XXX_REG_CTRL] = 0x00,
 325                 [BQ27XXX_REG_TEMP] = 0x06,
 326                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 327                 [BQ27XXX_REG_VOLT] = 0x08,
 328                 [BQ27XXX_REG_AI] = 0x14,
 329                 [BQ27XXX_REG_FLAGS] = 0x0a,
 330                 [BQ27XXX_REG_TTE] = 0x16,
 331                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 332                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 333                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 334                 [BQ27XXX_REG_NAC] = 0x0c,
 335                 [BQ27XXX_REG_FCC] = 0x12,
 336                 [BQ27XXX_REG_CYCT] = 0x2a,
 337                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 338                 [BQ27XXX_REG_SOC] = 0x2c,
 339                 [BQ27XXX_REG_DCAP] = 0x3c,
 340                 [BQ27XXX_REG_AP] = 0x24,
 341         },
 342         [BQ27545] = {
 343                 [BQ27XXX_REG_CTRL] = 0x00,
 344                 [BQ27XXX_REG_TEMP] = 0x06,
 345                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 346                 [BQ27XXX_REG_VOLT] = 0x08,
 347                 [BQ27XXX_REG_AI] = 0x14,
 348                 [BQ27XXX_REG_FLAGS] = 0x0a,
 349                 [BQ27XXX_REG_TTE] = 0x16,
 350                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 351                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 352                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 353                 [BQ27XXX_REG_NAC] = 0x0c,
 354                 [BQ27XXX_REG_FCC] = 0x12,
 355                 [BQ27XXX_REG_CYCT] = 0x2a,
 356                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 357                 [BQ27XXX_REG_SOC] = 0x2c,
 358                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 359                 [BQ27XXX_REG_AP] = 0x24,
 360         },
 361         [BQ27421] = {
 362                 [BQ27XXX_REG_CTRL] = 0x00,
 363                 [BQ27XXX_REG_TEMP] = 0x02,
 364                 [BQ27XXX_REG_INT_TEMP] = 0x1e,
 365                 [BQ27XXX_REG_VOLT] = 0x04,
 366                 [BQ27XXX_REG_AI] = 0x10,
 367                 [BQ27XXX_REG_FLAGS] = 0x06,
 368                 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
 369                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 370                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 371                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 372                 [BQ27XXX_REG_NAC] = 0x08,
 373                 [BQ27XXX_REG_FCC] = 0x0e,
 374                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 375                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 376                 [BQ27XXX_REG_SOC] = 0x1c,
 377                 [BQ27XXX_REG_DCAP] = 0x3c,
 378                 [BQ27XXX_REG_AP] = 0x18,
 379         },
 380 };
 381
 382 static enum power_supply_property bq27000_battery_props[] = {
 383         POWER_SUPPLY_PROP_STATUS,
 384         POWER_SUPPLY_PROP_PRESENT,
 385         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 386         POWER_SUPPLY_PROP_CURRENT_NOW,
 387         POWER_SUPPLY_PROP_CAPACITY,
 388         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 389         POWER_SUPPLY_PROP_TEMP,
 390         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 391         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 392         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 393         POWER_SUPPLY_PROP_TECHNOLOGY,
 394         POWER_SUPPLY_PROP_CHARGE_FULL,
 395         POWER_SUPPLY_PROP_CHARGE_NOW,
 396         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 397         POWER_SUPPLY_PROP_CYCLE_COUNT,
 398         POWER_SUPPLY_PROP_ENERGY_NOW,
 399         POWER_SUPPLY_PROP_POWER_AVG,
 400         POWER_SUPPLY_PROP_HEALTH,
 401         POWER_SUPPLY_PROP_MANUFACTURER,
 402 };
 403
 404 static enum power_supply_property bq27010_battery_props[] = {
 405         POWER_SUPPLY_PROP_STATUS,
 406         POWER_SUPPLY_PROP_PRESENT,
 407         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 408         POWER_SUPPLY_PROP_CURRENT_NOW,
 409         POWER_SUPPLY_PROP_CAPACITY,
 410         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 411         POWER_SUPPLY_PROP_TEMP,
 412         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 413         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 414         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 415         POWER_SUPPLY_PROP_TECHNOLOGY,
 416         POWER_SUPPLY_PROP_CHARGE_FULL,
 417         POWER_SUPPLY_PROP_CHARGE_NOW,
 418         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 419         POWER_SUPPLY_PROP_CYCLE_COUNT,
 420         POWER_SUPPLY_PROP_HEALTH,
 421         POWER_SUPPLY_PROP_MANUFACTURER,
 422 };
 423
 424 static enum power_supply_property bq2750x_battery_props[] = {
 425         POWER_SUPPLY_PROP_STATUS,
 426         POWER_SUPPLY_PROP_PRESENT,
 427         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 428         POWER_SUPPLY_PROP_CURRENT_NOW,
 429         POWER_SUPPLY_PROP_CAPACITY,
 430         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 431         POWER_SUPPLY_PROP_TEMP,
 432         POWER_SUPPLY_PROP_TIME_TO_EMPTY_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_HEALTH,
 439         POWER_SUPPLY_PROP_MANUFACTURER,
 440 };
 441
 442 static enum power_supply_property bq2751x_battery_props[] = {
 443         POWER_SUPPLY_PROP_STATUS,
 444         POWER_SUPPLY_PROP_PRESENT,
 445         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 446         POWER_SUPPLY_PROP_CURRENT_NOW,
 447         POWER_SUPPLY_PROP_CAPACITY,
 448         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 449         POWER_SUPPLY_PROP_TEMP,
 450         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 451         POWER_SUPPLY_PROP_TECHNOLOGY,
 452         POWER_SUPPLY_PROP_CHARGE_FULL,
 453         POWER_SUPPLY_PROP_CHARGE_NOW,
 454         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 455         POWER_SUPPLY_PROP_CYCLE_COUNT,
 456         POWER_SUPPLY_PROP_HEALTH,
 457         POWER_SUPPLY_PROP_MANUFACTURER,
 458 };
 459
 460 static enum power_supply_property bq27500_battery_props[] = {
 461         POWER_SUPPLY_PROP_STATUS,
 462         POWER_SUPPLY_PROP_PRESENT,
 463         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 464         POWER_SUPPLY_PROP_CURRENT_NOW,
 465         POWER_SUPPLY_PROP_CAPACITY,
 466         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 467         POWER_SUPPLY_PROP_TEMP,
 468         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 469         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 470         POWER_SUPPLY_PROP_TECHNOLOGY,
 471         POWER_SUPPLY_PROP_CHARGE_FULL,
 472         POWER_SUPPLY_PROP_CHARGE_NOW,
 473         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 474         POWER_SUPPLY_PROP_CYCLE_COUNT,
 475         POWER_SUPPLY_PROP_ENERGY_NOW,
 476         POWER_SUPPLY_PROP_POWER_AVG,
 477         POWER_SUPPLY_PROP_HEALTH,
 478         POWER_SUPPLY_PROP_MANUFACTURER,
 479 };
 480
 481 static enum power_supply_property bq27510g1_battery_props[] = {
 482         POWER_SUPPLY_PROP_STATUS,
 483         POWER_SUPPLY_PROP_PRESENT,
 484         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 485         POWER_SUPPLY_PROP_CURRENT_NOW,
 486         POWER_SUPPLY_PROP_CAPACITY,
 487         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 488         POWER_SUPPLY_PROP_TEMP,
 489         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 490         POWER_SUPPLY_PROP_TIME_TO_FULL_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_ENERGY_NOW,
 497         POWER_SUPPLY_PROP_POWER_AVG,
 498         POWER_SUPPLY_PROP_HEALTH,
 499         POWER_SUPPLY_PROP_MANUFACTURER,
 500 };
 501
 502 static enum power_supply_property bq27510g2_battery_props[] = {
 503         POWER_SUPPLY_PROP_STATUS,
 504         POWER_SUPPLY_PROP_PRESENT,
 505         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 506         POWER_SUPPLY_PROP_CURRENT_NOW,
 507         POWER_SUPPLY_PROP_CAPACITY,
 508         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 509         POWER_SUPPLY_PROP_TEMP,
 510         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 511         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 512         POWER_SUPPLY_PROP_TECHNOLOGY,
 513         POWER_SUPPLY_PROP_CHARGE_FULL,
 514         POWER_SUPPLY_PROP_CHARGE_NOW,
 515         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 516         POWER_SUPPLY_PROP_CYCLE_COUNT,
 517         POWER_SUPPLY_PROP_ENERGY_NOW,
 518         POWER_SUPPLY_PROP_POWER_AVG,
 519         POWER_SUPPLY_PROP_HEALTH,
 520         POWER_SUPPLY_PROP_MANUFACTURER,
 521 };
 522
 523 static enum power_supply_property bq27510g3_battery_props[] = {
 524         POWER_SUPPLY_PROP_STATUS,
 525         POWER_SUPPLY_PROP_PRESENT,
 526         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 527         POWER_SUPPLY_PROP_CURRENT_NOW,
 528         POWER_SUPPLY_PROP_CAPACITY,
 529         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 530         POWER_SUPPLY_PROP_TEMP,
 531         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 532         POWER_SUPPLY_PROP_TECHNOLOGY,
 533         POWER_SUPPLY_PROP_CHARGE_FULL,
 534         POWER_SUPPLY_PROP_CHARGE_NOW,
 535         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 536         POWER_SUPPLY_PROP_CYCLE_COUNT,
 537         POWER_SUPPLY_PROP_HEALTH,
 538         POWER_SUPPLY_PROP_MANUFACTURER,
 539 };
 540
 541 static enum power_supply_property bq27520g1_battery_props[] = {
 542         POWER_SUPPLY_PROP_STATUS,
 543         POWER_SUPPLY_PROP_PRESENT,
 544         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 545         POWER_SUPPLY_PROP_CURRENT_NOW,
 546         POWER_SUPPLY_PROP_CAPACITY,
 547         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 548         POWER_SUPPLY_PROP_TEMP,
 549         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 550         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 551         POWER_SUPPLY_PROP_TECHNOLOGY,
 552         POWER_SUPPLY_PROP_CHARGE_FULL,
 553         POWER_SUPPLY_PROP_CHARGE_NOW,
 554         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 555         POWER_SUPPLY_PROP_ENERGY_NOW,
 556         POWER_SUPPLY_PROP_POWER_AVG,
 557         POWER_SUPPLY_PROP_HEALTH,
 558         POWER_SUPPLY_PROP_MANUFACTURER,
 559 };
 560
 561 static enum power_supply_property bq27520g2_battery_props[] = {
 562         POWER_SUPPLY_PROP_STATUS,
 563         POWER_SUPPLY_PROP_PRESENT,
 564         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 565         POWER_SUPPLY_PROP_CURRENT_NOW,
 566         POWER_SUPPLY_PROP_CAPACITY,
 567         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 568         POWER_SUPPLY_PROP_TEMP,
 569         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 570         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 571         POWER_SUPPLY_PROP_TECHNOLOGY,
 572         POWER_SUPPLY_PROP_CHARGE_FULL,
 573         POWER_SUPPLY_PROP_CHARGE_NOW,
 574         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 575         POWER_SUPPLY_PROP_CYCLE_COUNT,
 576         POWER_SUPPLY_PROP_ENERGY_NOW,
 577         POWER_SUPPLY_PROP_POWER_AVG,
 578         POWER_SUPPLY_PROP_HEALTH,
 579         POWER_SUPPLY_PROP_MANUFACTURER,
 580 };
 581
 582 static enum power_supply_property bq27530_battery_props[] = {
 583         POWER_SUPPLY_PROP_STATUS,
 584         POWER_SUPPLY_PROP_PRESENT,
 585         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 586         POWER_SUPPLY_PROP_CURRENT_NOW,
 587         POWER_SUPPLY_PROP_CAPACITY,
 588         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 589         POWER_SUPPLY_PROP_TEMP,
 590         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 591         POWER_SUPPLY_PROP_TECHNOLOGY,
 592         POWER_SUPPLY_PROP_CHARGE_FULL,
 593         POWER_SUPPLY_PROP_CHARGE_NOW,
 594         POWER_SUPPLY_PROP_POWER_AVG,
 595         POWER_SUPPLY_PROP_HEALTH,
 596         POWER_SUPPLY_PROP_CYCLE_COUNT,
 597         POWER_SUPPLY_PROP_MANUFACTURER,
 598 };
 599
 600 static enum power_supply_property bq27541_battery_props[] = {
 601         POWER_SUPPLY_PROP_STATUS,
 602         POWER_SUPPLY_PROP_PRESENT,
 603         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 604         POWER_SUPPLY_PROP_CURRENT_NOW,
 605         POWER_SUPPLY_PROP_CAPACITY,
 606         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 607         POWER_SUPPLY_PROP_TEMP,
 608         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 609         POWER_SUPPLY_PROP_TECHNOLOGY,
 610         POWER_SUPPLY_PROP_CHARGE_FULL,
 611         POWER_SUPPLY_PROP_CHARGE_NOW,
 612         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 613         POWER_SUPPLY_PROP_CYCLE_COUNT,
 614         POWER_SUPPLY_PROP_POWER_AVG,
 615         POWER_SUPPLY_PROP_HEALTH,
 616         POWER_SUPPLY_PROP_MANUFACTURER,
 617 };
 618
 619 static enum power_supply_property bq27545_battery_props[] = {
 620         POWER_SUPPLY_PROP_STATUS,
 621         POWER_SUPPLY_PROP_PRESENT,
 622         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 623         POWER_SUPPLY_PROP_CURRENT_NOW,
 624         POWER_SUPPLY_PROP_CAPACITY,
 625         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 626         POWER_SUPPLY_PROP_TEMP,
 627         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 628         POWER_SUPPLY_PROP_TECHNOLOGY,
 629         POWER_SUPPLY_PROP_CHARGE_FULL,
 630         POWER_SUPPLY_PROP_CHARGE_NOW,
 631         POWER_SUPPLY_PROP_HEALTH,
 632         POWER_SUPPLY_PROP_CYCLE_COUNT,
 633         POWER_SUPPLY_PROP_POWER_AVG,
 634         POWER_SUPPLY_PROP_MANUFACTURER,
 635 };
 636
 637 static enum power_supply_property bq27421_battery_props[] = {
 638         POWER_SUPPLY_PROP_STATUS,
 639         POWER_SUPPLY_PROP_PRESENT,
 640         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 641         POWER_SUPPLY_PROP_CURRENT_NOW,
 642         POWER_SUPPLY_PROP_CAPACITY,
 643         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 644         POWER_SUPPLY_PROP_TEMP,
 645         POWER_SUPPLY_PROP_TECHNOLOGY,
 646         POWER_SUPPLY_PROP_CHARGE_FULL,
 647         POWER_SUPPLY_PROP_CHARGE_NOW,
 648         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 649         POWER_SUPPLY_PROP_MANUFACTURER,
 650 };
 651
 652 #define BQ27XXX_PROP(_id, _prop)                \
 653         [_id] = {                               \
 654                 .props = _prop,                 \
 655                 .size = ARRAY_SIZE(_prop),      \
 656         }
 657
 658 static struct {
 659         enum power_supply_property *props;
 660         size_t size;
 661 } bq27xxx_battery_props[] = {
 662         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
 663         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
 664         BQ27XXX_PROP(BQ2750X, bq2750x_battery_props),
 665         BQ27XXX_PROP(BQ2751X, bq2751x_battery_props),
 666         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
 667         BQ27XXX_PROP(BQ27510G1, bq27510g1_battery_props),
 668         BQ27XXX_PROP(BQ27510G2, bq27510g2_battery_props),
 669         BQ27XXX_PROP(BQ27510G3, bq27510g3_battery_props),
 670         BQ27XXX_PROP(BQ27520G1, bq27520g1_battery_props),
 671         BQ27XXX_PROP(BQ27520G2, bq27520g2_battery_props),
 672         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
 673         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
 674         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
 675         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
 676 };
 677
 678 static DEFINE_MUTEX(bq27xxx_list_lock);
 679 static LIST_HEAD(bq27xxx_battery_devices);
 680
 681 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
 682 {
 683         struct bq27xxx_device_info *di;
 684         unsigned int prev_val = *(unsigned int *) kp->arg;
 685         int ret;
 686
 687         ret = param_set_uint(val, kp);
 688         if (ret < 0 || prev_val == *(unsigned int *) kp->arg)
 689                 return ret;
 690
 691         mutex_lock(&bq27xxx_list_lock);
 692         list_for_each_entry(di, &bq27xxx_battery_devices, list) {
 693                 cancel_delayed_work_sync(&di->work);
 694                 schedule_delayed_work(&di->work, 0);
 695         }
 696         mutex_unlock(&bq27xxx_list_lock);
 697
 698         return ret;
 699 }
 700
 701 static const struct kernel_param_ops param_ops_poll_interval = {
 702         .get = param_get_uint,
 703         .set = poll_interval_param_set,
 704 };
 705
 706 static unsigned int poll_interval = 360;
 707 module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
 708 MODULE_PARM_DESC(poll_interval,
 709                  "battery poll interval in seconds - 0 disables polling");
 710
 711 /*
 712  * Common code for BQ27xxx devices
 713  */
 714
 715 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 716                                bool single)
 717 {
 718         /* Reports EINVAL for invalid/missing registers */
 719         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 720                 return -EINVAL;
 721
 722         return di->bus.read(di, di->regs[reg_index], single);
 723 }
 724
 725 /*
 726  * Return the battery State-of-Charge
 727  * Or < 0 if something fails.
 728  */
 729 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 730 {
 731         int soc;
 732
 733         if (di->chip == BQ27000 || di->chip == BQ27010)
 734                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
 735         else
 736                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 737
 738         if (soc < 0)
 739                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 740
 741         return soc;
 742 }
 743
 744 /*
 745  * Return a battery charge value in µAh
 746  * Or < 0 if something fails.
 747  */
 748 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 749 {
 750         int charge;
 751
 752         charge = bq27xxx_read(di, reg, false);
 753         if (charge < 0) {
 754                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 755                         reg, charge);
 756                 return charge;
 757         }
 758
 759         if (di->chip == BQ27000 || di->chip == BQ27010)
 760                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 761         else
 762                 charge *= 1000;
 763
 764         return charge;
 765 }
 766
 767 /*
 768  * Return the battery Nominal available capacity in µAh
 769  * Or < 0 if something fails.
 770  */
 771 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 772 {
 773         int flags;
 774
 775         if (di->chip == BQ27000 || di->chip == BQ27010) {
 776                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 777                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 778                         return -ENODATA;
 779         }
 780
 781         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 782 }
 783
 784 /*
 785  * Return the battery Full Charge Capacity in µAh
 786  * Or < 0 if something fails.
 787  */
 788 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 789 {
 790         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 791 }
 792
 793 /*
 794  * Return the Design Capacity in µAh
 795  * Or < 0 if something fails.
 796  */
 797 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 798 {
 799         int dcap;
 800
 801         if (di->chip == BQ27000 || di->chip == BQ27010)
 802                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
 803         else
 804                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 805
 806         if (dcap < 0) {
 807                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 808                 return dcap;
 809         }
 810
 811         if (di->chip == BQ27000 || di->chip == BQ27010)
 812                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 813         else
 814                 dcap *= 1000;
 815
 816         return dcap;
 817 }
 818
 819 /*
 820  * Return the battery Available energy in µWh
 821  * Or < 0 if something fails.
 822  */
 823 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 824 {
 825         int ae;
 826
 827         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 828         if (ae < 0) {
 829                 dev_dbg(di->dev, "error reading available energy\n");
 830                 return ae;
 831         }
 832
 833         if (di->chip == BQ27000 || di->chip == BQ27010)
 834                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 835         else
 836                 ae *= 1000;
 837
 838         return ae;
 839 }
 840
 841 /*
 842  * Return the battery temperature in tenths of degree Kelvin
 843  * Or < 0 if something fails.
 844  */
 845 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 846 {
 847         int temp;
 848
 849         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 850         if (temp < 0) {
 851                 dev_err(di->dev, "error reading temperature\n");
 852                 return temp;
 853         }
 854
 855         if (di->chip == BQ27000 || di->chip == BQ27010)
 856                 temp = 5 * temp / 2;
 857
 858         return temp;
 859 }
 860
 861 /*
 862  * Return the battery Cycle count total
 863  * Or < 0 if something fails.
 864  */
 865 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 866 {
 867         int cyct;
 868
 869         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 870         if (cyct < 0)
 871                 dev_err(di->dev, "error reading cycle count total\n");
 872
 873         return cyct;
 874 }
 875
 876 /*
 877  * Read a time register.
 878  * Return < 0 if something fails.
 879  */
 880 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 881 {
 882         int tval;
 883
 884         tval = bq27xxx_read(di, reg, false);
 885         if (tval < 0) {
 886                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 887                         reg, tval);
 888                 return tval;
 889         }
 890
 891         if (tval == 65535)
 892                 return -ENODATA;
 893
 894         return tval * 60;
 895 }
 896
 897 /*
 898  * Read an average power register.
 899  * Return < 0 if something fails.
 900  */
 901 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 902 {
 903         int tval;
 904
 905         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 906         if (tval < 0) {
 907                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 908                         BQ27XXX_REG_AP, tval);
 909                 return tval;
 910         }
 911
 912         if (di->chip == BQ27000 || di->chip == BQ27010)
 913                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 914         else
 915                 return tval;
 916 }
 917
 918 /*
 919  * Returns true if a battery over temperature condition is detected
 920  */
 921 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
 922 {
 923         switch (di->chip) {
 924         case BQ2750X:
 925         case BQ2751X:
 926         case BQ27500:
 927         case BQ27510G1:
 928         case BQ27510G2:
 929         case BQ27510G3:
 930         case BQ27520G1:
 931         case BQ27520G2:
 932         case BQ27541:
 933         case BQ27545:
 934                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 935         case BQ27530:
 936         case BQ27421:
 937                 return flags & BQ27XXX_FLAG_OT;
 938         default:
 939                 return false;
 940         }
 941 }
 942
 943 /*
 944  * Returns true if a battery under temperature condition is detected
 945  */
 946 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
 947 {
 948         if (di->chip == BQ27530 || di->chip == BQ27421)
 949                 return flags & BQ27XXX_FLAG_UT;
 950
 951         return false;
 952 }
 953
 954 /*
 955  * Returns true if a low state of charge condition is detected
 956  */
 957 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
 958 {
 959         if (di->chip == BQ27000 || di->chip == BQ27010)
 960                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
 961         else
 962                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
 963 }
 964
 965 /*
 966  * Read flag register.
 967  * Return < 0 if something fails.
 968  */
 969 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
 970 {
 971         int flags;
 972         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 973
 974         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 975         if (flags < 0) {
 976                 dev_err(di->dev, "error reading flag register:%d\n", flags);
 977                 return flags;
 978         }
 979
 980         /* Unlikely but important to return first */
 981         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
 982                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 983         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
 984                 return POWER_SUPPLY_HEALTH_COLD;
 985         if (unlikely(bq27xxx_battery_dead(di, flags)))
 986                 return POWER_SUPPLY_HEALTH_DEAD;
 987
 988         return POWER_SUPPLY_HEALTH_GOOD;
 989 }
 990
 991 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
 992 {
 993         struct bq27xxx_reg_cache cache = {0, };
 994         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
 995         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 996
 997         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 998         if ((cache.flags & 0xff) == 0xff)
 999                 cache.flags = -1; /* read error */
1000         if (cache.flags >= 0) {
1001                 cache.temperature = bq27xxx_battery_read_temperature(di);
1002                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
1003                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
1004                         cache.capacity = -ENODATA;
1005                         cache.energy = -ENODATA;
1006                         cache.time_to_empty = -ENODATA;
1007                         cache.time_to_empty_avg = -ENODATA;
1008                         cache.time_to_full = -ENODATA;
1009                         cache.charge_full = -ENODATA;
1010                         cache.health = -ENODATA;
1011                 } else {
1012                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
1013                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
1014                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
1015                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
1016                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
1017                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
1018                         cache.charge_full = bq27xxx_battery_read_fcc(di);
1019                         cache.capacity = bq27xxx_battery_read_soc(di);
1020                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
1021                                 cache.energy = bq27xxx_battery_read_energy(di);
1022                         cache.health = bq27xxx_battery_read_health(di);
1023                 }
1024                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
1025                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
1026                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
1027                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
1028
1029                 /* We only have to read charge design full once */
1030                 if (di->charge_design_full <= 0)
1031                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
1032         }
1033
1034         if (di->cache.capacity != cache.capacity)
1035                 power_supply_changed(di->bat);
1036
1037         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
1038                 di->cache = cache;
1039
1040         di->last_update = jiffies;
1041 }
1042 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
1043
1044 static void bq27xxx_battery_poll(struct work_struct *work)
1045 {
1046         struct bq27xxx_device_info *di =
1047                         container_of(work, struct bq27xxx_device_info,
1048                                      work.work);
1049
1050         bq27xxx_battery_update(di);
1051
1052         if (poll_interval > 0)
1053                 schedule_delayed_work(&di->work, poll_interval * HZ);
1054 }
1055
1056 /*
1057  * Return the battery average current in µA
1058  * Note that current can be negative signed as well
1059  * Or 0 if something fails.
1060  */
1061 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
1062                                    union power_supply_propval *val)
1063 {
1064         int curr;
1065         int flags;
1066
1067         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
1068         if (curr < 0) {
1069                 dev_err(di->dev, "error reading current\n");
1070                 return curr;
1071         }
1072
1073         if (di->chip == BQ27000 || di->chip == BQ27010) {
1074                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
1075                 if (flags & BQ27000_FLAG_CHGS) {
1076                         dev_dbg(di->dev, "negative current!\n");
1077                         curr = -curr;
1078                 }
1079
1080                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
1081         } else {
1082                 /* Other gauges return signed value */
1083                 val->intval = (int)((s16)curr) * 1000;
1084         }
1085
1086         return 0;
1087 }
1088
1089 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
1090                                   union power_supply_propval *val)
1091 {
1092         int status;
1093
1094         if (di->chip == BQ27000 || di->chip == BQ27010) {
1095                 if (di->cache.flags & BQ27000_FLAG_FC)
1096                         status = POWER_SUPPLY_STATUS_FULL;
1097                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
1098                         status = POWER_SUPPLY_STATUS_CHARGING;
1099                 else if (power_supply_am_i_supplied(di->bat))
1100                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1101                 else
1102                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1103         } else {
1104                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1105                         status = POWER_SUPPLY_STATUS_FULL;
1106                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
1107                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1108                 else
1109                         status = POWER_SUPPLY_STATUS_CHARGING;
1110         }
1111
1112         val->intval = status;
1113
1114         return 0;
1115 }
1116
1117 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
1118                                           union power_supply_propval *val)
1119 {
1120         int level;
1121
1122         if (di->chip == BQ27000 || di->chip == BQ27010) {
1123                 if (di->cache.flags & BQ27000_FLAG_FC)
1124                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1125                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
1126                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1127                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
1128                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1129                 else
1130                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1131         } else {
1132                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1133                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1134                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
1135                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1136                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
1137                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1138                 else
1139                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1140         }
1141
1142         val->intval = level;
1143
1144         return 0;
1145 }
1146
1147 /*
1148  * Return the battery Voltage in millivolts
1149  * Or < 0 if something fails.
1150  */
1151 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
1152                                    union power_supply_propval *val)
1153 {
1154         int volt;
1155
1156         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
1157         if (volt < 0) {
1158                 dev_err(di->dev, "error reading voltage\n");
1159                 return volt;
1160         }
1161
1162         val->intval = volt * 1000;
1163
1164         return 0;
1165 }
1166
1167 static int bq27xxx_simple_value(int value,
1168                                 union power_supply_propval *val)
1169 {
1170         if (value < 0)
1171                 return value;
1172
1173         val->intval = value;
1174
1175         return 0;
1176 }
1177
1178 static int bq27xxx_battery_get_property(struct power_supply *psy,
1179                                         enum power_supply_property psp,
1180                                         union power_supply_propval *val)
1181 {
1182         int ret = 0;
1183         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1184
1185         mutex_lock(&di->lock);
1186         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
1187                 cancel_delayed_work_sync(&di->work);
1188                 bq27xxx_battery_poll(&di->work.work);
1189         }
1190         mutex_unlock(&di->lock);
1191
1192         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
1193                 return -ENODEV;
1194
1195         switch (psp) {
1196         case POWER_SUPPLY_PROP_STATUS:
1197                 ret = bq27xxx_battery_status(di, val);
1198                 break;
1199         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1200                 ret = bq27xxx_battery_voltage(di, val);
1201                 break;
1202         case POWER_SUPPLY_PROP_PRESENT:
1203                 val->intval = di->cache.flags < 0 ? 0 : 1;
1204                 break;
1205         case POWER_SUPPLY_PROP_CURRENT_NOW:
1206                 ret = bq27xxx_battery_current(di, val);
1207                 break;
1208         case POWER_SUPPLY_PROP_CAPACITY:
1209                 ret = bq27xxx_simple_value(di->cache.capacity, val);
1210                 break;
1211         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1212                 ret = bq27xxx_battery_capacity_level(di, val);
1213                 break;
1214         case POWER_SUPPLY_PROP_TEMP:
1215                 ret = bq27xxx_simple_value(di->cache.temperature, val);
1216                 if (ret == 0)
1217                         val->intval -= 2731; /* convert decidegree k to c */
1218                 break;
1219         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
1220                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
1221                 break;
1222         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
1223                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
1224                 break;
1225         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
1226                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
1227                 break;
1228         case POWER_SUPPLY_PROP_TECHNOLOGY:
1229                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
1230                 break;
1231         case POWER_SUPPLY_PROP_CHARGE_NOW:
1232                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
1233                 break;
1234         case POWER_SUPPLY_PROP_CHARGE_FULL:
1235                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
1236                 break;
1237         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1238                 ret = bq27xxx_simple_value(di->charge_design_full, val);
1239                 break;
1240         case POWER_SUPPLY_PROP_CYCLE_COUNT:
1241                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
1242                 break;
1243         case POWER_SUPPLY_PROP_ENERGY_NOW:
1244                 ret = bq27xxx_simple_value(di->cache.energy, val);
1245                 break;
1246         case POWER_SUPPLY_PROP_POWER_AVG:
1247                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
1248                 break;
1249         case POWER_SUPPLY_PROP_HEALTH:
1250                 ret = bq27xxx_simple_value(di->cache.health, val);
1251                 break;
1252         case POWER_SUPPLY_PROP_MANUFACTURER:
1253                 val->strval = BQ27XXX_MANUFACTURER;
1254                 break;
1255         default:
1256                 return -EINVAL;
1257         }
1258
1259         return ret;
1260 }
1261
1262 static void bq27xxx_external_power_changed(struct power_supply *psy)
1263 {
1264         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1265
1266         cancel_delayed_work_sync(&di->work);
1267         schedule_delayed_work(&di->work, 0);
1268 }
1269
1270 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1271 {
1272         struct power_supply_desc *psy_desc;
1273         struct power_supply_config psy_cfg = { .drv_data = di, };
1274
1275         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1276         mutex_init(&di->lock);
1277         di->regs = bq27xxx_regs[di->chip];
1278
1279         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1280         if (!psy_desc)
1281                 return -ENOMEM;
1282
1283         psy_desc->name = di->name;
1284         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1285         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
1286         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
1287         psy_desc->get_property = bq27xxx_battery_get_property;
1288         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1289
1290         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1291         if (IS_ERR(di->bat)) {
1292                 dev_err(di->dev, "failed to register battery\n");
1293                 return PTR_ERR(di->bat);
1294         }
1295
1296         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1297
1298         bq27xxx_battery_update(di);
1299
1300         mutex_lock(&bq27xxx_list_lock);
1301         list_add(&di->list, &bq27xxx_battery_devices);
1302         mutex_unlock(&bq27xxx_list_lock);
1303
1304         return 0;
1305 }
1306 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1307
1308 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1309 {
1310         /*
1311          * power_supply_unregister call bq27xxx_battery_get_property which
1312          * call bq27xxx_battery_poll.
1313          * Make sure that bq27xxx_battery_poll will not call
1314          * schedule_delayed_work again after unregister (which cause OOPS).
1315          */
1316         poll_interval = 0;
1317
1318         cancel_delayed_work_sync(&di->work);
1319
1320         power_supply_unregister(di->bat);
1321
1322         mutex_lock(&bq27xxx_list_lock);
1323         list_del(&di->list);
1324         mutex_unlock(&bq27xxx_list_lock);
1325
1326         mutex_destroy(&di->lock);
1327 }
1328 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1329
1330 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1331                                          bool single)
1332 {
1333         struct device *dev = di->dev;
1334         struct bq27xxx_platform_data *pdata = dev->platform_data;
1335         unsigned int timeout = 3;
1336         int upper, lower;
1337         int temp;
1338
1339         if (!single) {
1340                 /* Make sure the value has not changed in between reading the
1341                  * lower and the upper part */
1342                 upper = pdata->read(dev, reg + 1);
1343                 do {
1344                         temp = upper;
1345                         if (upper < 0)
1346                                 return upper;
1347
1348                         lower = pdata->read(dev, reg);
1349                         if (lower < 0)
1350                                 return lower;
1351
1352                         upper = pdata->read(dev, reg + 1);
1353                 } while (temp != upper && --timeout);
1354
1355                 if (timeout == 0)
1356                         return -EIO;
1357
1358                 return (upper << 8) | lower;
1359         }
1360
1361         return pdata->read(dev, reg);
1362 }
1363
1364 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1365 {
1366         struct bq27xxx_device_info *di;
1367         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1368
1369         if (!pdata) {
1370                 dev_err(&pdev->dev, "no platform_data supplied\n");
1371                 return -EINVAL;
1372         }
1373
1374         if (!pdata->read) {
1375                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1376                 return -EINVAL;
1377         }
1378
1379         if (!pdata->chip) {
1380                 dev_err(&pdev->dev, "no device supplied\n");
1381                 return -EINVAL;
1382         }
1383
1384         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1385         if (!di)
1386                 return -ENOMEM;
1387
1388         platform_set_drvdata(pdev, di);
1389
1390         di->dev = &pdev->dev;
1391         di->chip = pdata->chip;
1392         di->name = pdata->name ?: dev_name(&pdev->dev);
1393         di->bus.read = bq27xxx_battery_platform_read;
1394
1395         return bq27xxx_battery_setup(di);
1396 }
1397
1398 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1399 {
1400         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1401
1402         bq27xxx_battery_teardown(di);
1403
1404         return 0;
1405 }
1406
1407 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1408         { "bq27000-battery", },
1409         { /* sentinel */ }
1410 };
1411 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1412
1413 #ifdef CONFIG_OF
1414 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1415         { .compatible = "ti,bq27000" },
1416         {},
1417 };
1418 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1419 #endif
1420
1421 static struct platform_driver bq27xxx_battery_platform_driver = {
1422         .probe  = bq27xxx_battery_platform_probe,
1423         .remove = bq27xxx_battery_platform_remove,
1424         .driver = {
1425                 .name = "bq27000-battery",
1426                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1427         },
1428         .id_table = bq27xxx_battery_platform_id_table,
1429 };
1430 module_platform_driver(bq27xxx_battery_platform_driver);
1431
1432 MODULE_ALIAS("platform:bq27000-battery");
1433
1434 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1435 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1436 MODULE_LICENSE("GPL");