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/bq27530-g1
  31  * http://www.ti.com/product/bq27531-g1
  32  * http://www.ti.com/product/bq27541-g1
  33  * http://www.ti.com/product/bq27542-g1
  34  * http://www.ti.com/product/bq27546-g1
  35  * http://www.ti.com/product/bq27742-g1
  36  * http://www.ti.com/product/bq27545-g1
  37  * http://www.ti.com/product/bq27421-g1
  38  * http://www.ti.com/product/bq27425-g1
  39  * http://www.ti.com/product/bq27411-g1
  40  * http://www.ti.com/product/bq27621-g1
  41  */
  42
  43 #include <linux/device.h>
  44 #include <linux/module.h>
  45 #include <linux/mutex.h>
  46 #include <linux/param.h>
  47 #include <linux/jiffies.h>
  48 #include <linux/workqueue.h>
  49 #include <linux/delay.h>
  50 #include <linux/platform_device.h>
  51 #include <linux/power_supply.h>
  52 #include <linux/slab.h>
  53 #include <linux/of.h>
  54
  55 #include <linux/power/bq27xxx_battery.h>
  56
  57 #define DRIVER_VERSION          "1.2.0"
  58
  59 #define BQ27XXX_MANUFACTURER    "Texas Instruments"
  60
  61 /* BQ27XXX Flags */
  62 #define BQ27XXX_FLAG_DSC        BIT(0)
  63 #define BQ27XXX_FLAG_SOCF       BIT(1) /* State-of-Charge threshold final */
  64 #define BQ27XXX_FLAG_SOC1       BIT(2) /* State-of-Charge threshold 1 */
  65 #define BQ27XXX_FLAG_FC         BIT(9)
  66 #define BQ27XXX_FLAG_OTD        BIT(14)
  67 #define BQ27XXX_FLAG_OTC        BIT(15)
  68 #define BQ27XXX_FLAG_UT         BIT(14)
  69 #define BQ27XXX_FLAG_OT         BIT(15)
  70
  71 /* BQ27000 has different layout for Flags register */
  72 #define BQ27000_FLAG_EDVF       BIT(0) /* Final End-of-Discharge-Voltage flag */
  73 #define BQ27000_FLAG_EDV1       BIT(1) /* First End-of-Discharge-Voltage flag */
  74 #define BQ27000_FLAG_CI         BIT(4) /* Capacity Inaccurate flag */
  75 #define BQ27000_FLAG_FC         BIT(5)
  76 #define BQ27000_FLAG_CHGS       BIT(7) /* Charge state flag */
  77
  78 #define BQ27XXX_RS                      (20) /* Resistor sense mOhm */
  79 #define BQ27XXX_POWER_CONSTANT          (29200) /* 29.2 µV^2 * 1000 */
  80 #define BQ27XXX_CURRENT_CONSTANT        (3570) /* 3.57 µV * 1000 */
  81
  82 #define INVALID_REG_ADDR        0xff
  83
  84 /*
  85  * bq27xxx_reg_index - Register names
  86  *
  87  * These are indexes into a device's register mapping array.
  88  */
  89
  90 enum bq27xxx_reg_index {
  91         BQ27XXX_REG_CTRL = 0,   /* Control */
  92         BQ27XXX_REG_TEMP,       /* Temperature */
  93         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
  94         BQ27XXX_REG_VOLT,       /* Voltage */
  95         BQ27XXX_REG_AI,         /* Average Current */
  96         BQ27XXX_REG_FLAGS,      /* Flags */
  97         BQ27XXX_REG_TTE,        /* Time-to-Empty */
  98         BQ27XXX_REG_TTF,        /* Time-to-Full */
  99         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
 100         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
 101         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
 102         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
 103         BQ27XXX_REG_CYCT,       /* Cycle Count */
 104         BQ27XXX_REG_AE,         /* Available Energy */
 105         BQ27XXX_REG_SOC,        /* State-of-Charge */
 106         BQ27XXX_REG_DCAP,       /* Design Capacity */
 107         BQ27XXX_REG_AP,         /* Average Power */
 108         BQ27XXX_REG_MAX,        /* sentinel */
 109 };
 110
 111 /* Register mappings */
 112 static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 113         [BQ27000] = {
 114                 [BQ27XXX_REG_CTRL] = 0x00,
 115                 [BQ27XXX_REG_TEMP] = 0x06,
 116                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 117                 [BQ27XXX_REG_VOLT] = 0x08,
 118                 [BQ27XXX_REG_AI] = 0x14,
 119                 [BQ27XXX_REG_FLAGS] = 0x0a,
 120                 [BQ27XXX_REG_TTE] = 0x16,
 121                 [BQ27XXX_REG_TTF] = 0x18,
 122                 [BQ27XXX_REG_TTES] = 0x1c,
 123                 [BQ27XXX_REG_TTECP] = 0x26,
 124                 [BQ27XXX_REG_NAC] = 0x0c,
 125                 [BQ27XXX_REG_FCC] = 0x12,
 126                 [BQ27XXX_REG_CYCT] = 0x2a,
 127                 [BQ27XXX_REG_AE] = 0x22,
 128                 [BQ27XXX_REG_SOC] = 0x0b,
 129                 [BQ27XXX_REG_DCAP] = 0x76,
 130                 [BQ27XXX_REG_AP] = 0x24,
 131         },
 132         [BQ27010] = {
 133                 [BQ27XXX_REG_CTRL] = 0x00,
 134                 [BQ27XXX_REG_TEMP] = 0x06,
 135                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 136                 [BQ27XXX_REG_VOLT] = 0x08,
 137                 [BQ27XXX_REG_AI] = 0x14,
 138                 [BQ27XXX_REG_FLAGS] = 0x0a,
 139                 [BQ27XXX_REG_TTE] = 0x16,
 140                 [BQ27XXX_REG_TTF] = 0x18,
 141                 [BQ27XXX_REG_TTES] = 0x1c,
 142                 [BQ27XXX_REG_TTECP] = 0x26,
 143                 [BQ27XXX_REG_NAC] = 0x0c,
 144                 [BQ27XXX_REG_FCC] = 0x12,
 145                 [BQ27XXX_REG_CYCT] = 0x2a,
 146                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 147                 [BQ27XXX_REG_SOC] = 0x0b,
 148                 [BQ27XXX_REG_DCAP] = 0x76,
 149                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 150         },
 151         [BQ2750X] = {
 152                 [BQ27XXX_REG_CTRL] = 0x00,
 153                 [BQ27XXX_REG_TEMP] = 0x06,
 154                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 155                 [BQ27XXX_REG_VOLT] = 0x08,
 156                 [BQ27XXX_REG_AI] = 0x14,
 157                 [BQ27XXX_REG_FLAGS] = 0x0a,
 158                 [BQ27XXX_REG_TTE] = 0x16,
 159                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 160                 [BQ27XXX_REG_TTES] = 0x1a,
 161                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 162                 [BQ27XXX_REG_NAC] = 0x0c,
 163                 [BQ27XXX_REG_FCC] = 0x12,
 164                 [BQ27XXX_REG_CYCT] = 0x2a,
 165                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 166                 [BQ27XXX_REG_SOC] = 0x2c,
 167                 [BQ27XXX_REG_DCAP] = 0x3c,
 168                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 169         },
 170         [BQ2751X] = {
 171                 [BQ27XXX_REG_CTRL] = 0x00,
 172                 [BQ27XXX_REG_TEMP] = 0x06,
 173                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 174                 [BQ27XXX_REG_VOLT] = 0x08,
 175                 [BQ27XXX_REG_AI] = 0x14,
 176                 [BQ27XXX_REG_FLAGS] = 0x0a,
 177                 [BQ27XXX_REG_TTE] = 0x16,
 178                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 179                 [BQ27XXX_REG_TTES] = 0x1a,
 180                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 181                 [BQ27XXX_REG_NAC] = 0x0c,
 182                 [BQ27XXX_REG_FCC] = 0x12,
 183                 [BQ27XXX_REG_CYCT] = 0x1e,
 184                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 185                 [BQ27XXX_REG_SOC] = 0x20,
 186                 [BQ27XXX_REG_DCAP] = 0x2e,
 187                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 188         },
 189         [BQ27500] = {
 190                 [BQ27XXX_REG_CTRL] = 0x00,
 191                 [BQ27XXX_REG_TEMP] = 0x06,
 192                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 193                 [BQ27XXX_REG_VOLT] = 0x08,
 194                 [BQ27XXX_REG_AI] = 0x14,
 195                 [BQ27XXX_REG_FLAGS] = 0x0a,
 196                 [BQ27XXX_REG_TTE] = 0x16,
 197                 [BQ27XXX_REG_TTF] = 0x18,
 198                 [BQ27XXX_REG_TTES] = 0x1c,
 199                 [BQ27XXX_REG_TTECP] = 0x26,
 200                 [BQ27XXX_REG_NAC] = 0x0c,
 201                 [BQ27XXX_REG_FCC] = 0x12,
 202                 [BQ27XXX_REG_CYCT] = 0x2a,
 203                 [BQ27XXX_REG_AE] = 0x22,
 204                 [BQ27XXX_REG_SOC] = 0x2c,
 205                 [BQ27XXX_REG_DCAP] = 0x3c,
 206                 [BQ27XXX_REG_AP] = 0x24,
 207         },
 208         [BQ27510G1] = {
 209                 [BQ27XXX_REG_CTRL] = 0x00,
 210                 [BQ27XXX_REG_TEMP] = 0x06,
 211                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 212                 [BQ27XXX_REG_VOLT] = 0x08,
 213                 [BQ27XXX_REG_AI] = 0x14,
 214                 [BQ27XXX_REG_FLAGS] = 0x0a,
 215                 [BQ27XXX_REG_TTE] = 0x16,
 216                 [BQ27XXX_REG_TTF] = 0x18,
 217                 [BQ27XXX_REG_TTES] = 0x1c,
 218                 [BQ27XXX_REG_TTECP] = 0x26,
 219                 [BQ27XXX_REG_NAC] = 0x0c,
 220                 [BQ27XXX_REG_FCC] = 0x12,
 221                 [BQ27XXX_REG_CYCT] = 0x2a,
 222                 [BQ27XXX_REG_AE] = 0x22,
 223                 [BQ27XXX_REG_SOC] = 0x2c,
 224                 [BQ27XXX_REG_DCAP] = 0x3c,
 225                 [BQ27XXX_REG_AP] = 0x24,
 226         },
 227         [BQ27510G2] = {
 228                 [BQ27XXX_REG_CTRL] = 0x00,
 229                 [BQ27XXX_REG_TEMP] = 0x06,
 230                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 231                 [BQ27XXX_REG_VOLT] = 0x08,
 232                 [BQ27XXX_REG_AI] = 0x14,
 233                 [BQ27XXX_REG_FLAGS] = 0x0a,
 234                 [BQ27XXX_REG_TTE] = 0x16,
 235                 [BQ27XXX_REG_TTF] = 0x18,
 236                 [BQ27XXX_REG_TTES] = 0x1c,
 237                 [BQ27XXX_REG_TTECP] = 0x26,
 238                 [BQ27XXX_REG_NAC] = 0x0c,
 239                 [BQ27XXX_REG_FCC] = 0x12,
 240                 [BQ27XXX_REG_CYCT] = 0x2a,
 241                 [BQ27XXX_REG_AE] = 0x22,
 242                 [BQ27XXX_REG_SOC] = 0x2c,
 243                 [BQ27XXX_REG_DCAP] = 0x3c,
 244                 [BQ27XXX_REG_AP] = 0x24,
 245         },
 246         [BQ27510G3] = {
 247                 [BQ27XXX_REG_CTRL] = 0x00,
 248                 [BQ27XXX_REG_TEMP] = 0x06,
 249                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 250                 [BQ27XXX_REG_VOLT] = 0x08,
 251                 [BQ27XXX_REG_AI] = 0x14,
 252                 [BQ27XXX_REG_FLAGS] = 0x0a,
 253                 [BQ27XXX_REG_TTE] = 0x16,
 254                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 255                 [BQ27XXX_REG_TTES] = 0x1a,
 256                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 257                 [BQ27XXX_REG_NAC] = 0x0c,
 258                 [BQ27XXX_REG_FCC] = 0x12,
 259                 [BQ27XXX_REG_CYCT] = 0x1e,
 260                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 261                 [BQ27XXX_REG_SOC] = 0x20,
 262                 [BQ27XXX_REG_DCAP] = 0x2e,
 263                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 264         },
 265         [BQ27520G1] = {
 266                 [BQ27XXX_REG_CTRL] = 0x00,
 267                 [BQ27XXX_REG_TEMP] = 0x06,
 268                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 269                 [BQ27XXX_REG_VOLT] = 0x08,
 270                 [BQ27XXX_REG_AI] = 0x14,
 271                 [BQ27XXX_REG_FLAGS] = 0x0a,
 272                 [BQ27XXX_REG_TTE] = 0x16,
 273                 [BQ27XXX_REG_TTF] = 0x18,
 274                 [BQ27XXX_REG_TTES] = 0x1c,
 275                 [BQ27XXX_REG_TTECP] = 0x26,
 276                 [BQ27XXX_REG_NAC] = 0x0c,
 277                 [BQ27XXX_REG_FCC] = 0x12,
 278                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 279                 [BQ27XXX_REG_AE] = 0x22,
 280                 [BQ27XXX_REG_SOC] = 0x2c,
 281                 [BQ27XXX_REG_DCAP] = 0x3c,
 282                 [BQ27XXX_REG_AP] = 0x24,
 283         },
 284         [BQ27530] = {
 285                 [BQ27XXX_REG_CTRL] = 0x00,
 286                 [BQ27XXX_REG_TEMP] = 0x06,
 287                 [BQ27XXX_REG_INT_TEMP] = 0x32,
 288                 [BQ27XXX_REG_VOLT] = 0x08,
 289                 [BQ27XXX_REG_AI] = 0x14,
 290                 [BQ27XXX_REG_FLAGS] = 0x0a,
 291                 [BQ27XXX_REG_TTE] = 0x16,
 292                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 293                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 294                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 295                 [BQ27XXX_REG_NAC] = 0x0c,
 296                 [BQ27XXX_REG_FCC] = 0x12,
 297                 [BQ27XXX_REG_CYCT] = 0x2a,
 298                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 299                 [BQ27XXX_REG_SOC] = 0x2c,
 300                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 301                 [BQ27XXX_REG_AP] = 0x24,
 302         },
 303         [BQ27541] = {
 304                 [BQ27XXX_REG_CTRL] = 0x00,
 305                 [BQ27XXX_REG_TEMP] = 0x06,
 306                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 307                 [BQ27XXX_REG_VOLT] = 0x08,
 308                 [BQ27XXX_REG_AI] = 0x14,
 309                 [BQ27XXX_REG_FLAGS] = 0x0a,
 310                 [BQ27XXX_REG_TTE] = 0x16,
 311                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 312                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 313                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 314                 [BQ27XXX_REG_NAC] = 0x0c,
 315                 [BQ27XXX_REG_FCC] = 0x12,
 316                 [BQ27XXX_REG_CYCT] = 0x2a,
 317                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 318                 [BQ27XXX_REG_SOC] = 0x2c,
 319                 [BQ27XXX_REG_DCAP] = 0x3c,
 320                 [BQ27XXX_REG_AP] = 0x24,
 321         },
 322         [BQ27545] = {
 323                 [BQ27XXX_REG_CTRL] = 0x00,
 324                 [BQ27XXX_REG_TEMP] = 0x06,
 325                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 326                 [BQ27XXX_REG_VOLT] = 0x08,
 327                 [BQ27XXX_REG_AI] = 0x14,
 328                 [BQ27XXX_REG_FLAGS] = 0x0a,
 329                 [BQ27XXX_REG_TTE] = 0x16,
 330                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 331                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 332                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 333                 [BQ27XXX_REG_NAC] = 0x0c,
 334                 [BQ27XXX_REG_FCC] = 0x12,
 335                 [BQ27XXX_REG_CYCT] = 0x2a,
 336                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 337                 [BQ27XXX_REG_SOC] = 0x2c,
 338                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 339                 [BQ27XXX_REG_AP] = 0x24,
 340         },
 341         [BQ27421] = {
 342                 [BQ27XXX_REG_CTRL] = 0x00,
 343                 [BQ27XXX_REG_TEMP] = 0x02,
 344                 [BQ27XXX_REG_INT_TEMP] = 0x1e,
 345                 [BQ27XXX_REG_VOLT] = 0x04,
 346                 [BQ27XXX_REG_AI] = 0x10,
 347                 [BQ27XXX_REG_FLAGS] = 0x06,
 348                 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
 349                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 350                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 351                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 352                 [BQ27XXX_REG_NAC] = 0x08,
 353                 [BQ27XXX_REG_FCC] = 0x0e,
 354                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 355                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 356                 [BQ27XXX_REG_SOC] = 0x1c,
 357                 [BQ27XXX_REG_DCAP] = 0x3c,
 358                 [BQ27XXX_REG_AP] = 0x18,
 359         },
 360 };
 361
 362 static enum power_supply_property bq27000_battery_props[] = {
 363         POWER_SUPPLY_PROP_STATUS,
 364         POWER_SUPPLY_PROP_PRESENT,
 365         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 366         POWER_SUPPLY_PROP_CURRENT_NOW,
 367         POWER_SUPPLY_PROP_CAPACITY,
 368         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 369         POWER_SUPPLY_PROP_TEMP,
 370         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 371         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 372         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 373         POWER_SUPPLY_PROP_TECHNOLOGY,
 374         POWER_SUPPLY_PROP_CHARGE_FULL,
 375         POWER_SUPPLY_PROP_CHARGE_NOW,
 376         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 377         POWER_SUPPLY_PROP_CYCLE_COUNT,
 378         POWER_SUPPLY_PROP_ENERGY_NOW,
 379         POWER_SUPPLY_PROP_POWER_AVG,
 380         POWER_SUPPLY_PROP_HEALTH,
 381         POWER_SUPPLY_PROP_MANUFACTURER,
 382 };
 383
 384 static enum power_supply_property bq27010_battery_props[] = {
 385         POWER_SUPPLY_PROP_STATUS,
 386         POWER_SUPPLY_PROP_PRESENT,
 387         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 388         POWER_SUPPLY_PROP_CURRENT_NOW,
 389         POWER_SUPPLY_PROP_CAPACITY,
 390         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 391         POWER_SUPPLY_PROP_TEMP,
 392         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 393         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 394         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 395         POWER_SUPPLY_PROP_TECHNOLOGY,
 396         POWER_SUPPLY_PROP_CHARGE_FULL,
 397         POWER_SUPPLY_PROP_CHARGE_NOW,
 398         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 399         POWER_SUPPLY_PROP_CYCLE_COUNT,
 400         POWER_SUPPLY_PROP_HEALTH,
 401         POWER_SUPPLY_PROP_MANUFACTURER,
 402 };
 403
 404 static enum power_supply_property bq2750x_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_TECHNOLOGY,
 414         POWER_SUPPLY_PROP_CHARGE_FULL,
 415         POWER_SUPPLY_PROP_CHARGE_NOW,
 416         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 417         POWER_SUPPLY_PROP_CYCLE_COUNT,
 418         POWER_SUPPLY_PROP_HEALTH,
 419         POWER_SUPPLY_PROP_MANUFACTURER,
 420 };
 421
 422 static enum power_supply_property bq2751x_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_TECHNOLOGY,
 432         POWER_SUPPLY_PROP_CHARGE_FULL,
 433         POWER_SUPPLY_PROP_CHARGE_NOW,
 434         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 435         POWER_SUPPLY_PROP_CYCLE_COUNT,
 436         POWER_SUPPLY_PROP_HEALTH,
 437         POWER_SUPPLY_PROP_MANUFACTURER,
 438 };
 439
 440 static enum power_supply_property bq27500_battery_props[] = {
 441         POWER_SUPPLY_PROP_STATUS,
 442         POWER_SUPPLY_PROP_PRESENT,
 443         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 444         POWER_SUPPLY_PROP_CURRENT_NOW,
 445         POWER_SUPPLY_PROP_CAPACITY,
 446         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 447         POWER_SUPPLY_PROP_TEMP,
 448         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 449         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 450         POWER_SUPPLY_PROP_TECHNOLOGY,
 451         POWER_SUPPLY_PROP_CHARGE_FULL,
 452         POWER_SUPPLY_PROP_CHARGE_NOW,
 453         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 454         POWER_SUPPLY_PROP_CYCLE_COUNT,
 455         POWER_SUPPLY_PROP_ENERGY_NOW,
 456         POWER_SUPPLY_PROP_POWER_AVG,
 457         POWER_SUPPLY_PROP_HEALTH,
 458         POWER_SUPPLY_PROP_MANUFACTURER,
 459 };
 460
 461 static enum power_supply_property bq27510g1_battery_props[] = {
 462         POWER_SUPPLY_PROP_STATUS,
 463         POWER_SUPPLY_PROP_PRESENT,
 464         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 465         POWER_SUPPLY_PROP_CURRENT_NOW,
 466         POWER_SUPPLY_PROP_CAPACITY,
 467         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 468         POWER_SUPPLY_PROP_TEMP,
 469         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 470         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 471         POWER_SUPPLY_PROP_TECHNOLOGY,
 472         POWER_SUPPLY_PROP_CHARGE_FULL,
 473         POWER_SUPPLY_PROP_CHARGE_NOW,
 474         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 475         POWER_SUPPLY_PROP_CYCLE_COUNT,
 476         POWER_SUPPLY_PROP_ENERGY_NOW,
 477         POWER_SUPPLY_PROP_POWER_AVG,
 478         POWER_SUPPLY_PROP_HEALTH,
 479         POWER_SUPPLY_PROP_MANUFACTURER,
 480 };
 481
 482 static enum power_supply_property bq27510g2_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_TIME_TO_FULL_NOW,
 492         POWER_SUPPLY_PROP_TECHNOLOGY,
 493         POWER_SUPPLY_PROP_CHARGE_FULL,
 494         POWER_SUPPLY_PROP_CHARGE_NOW,
 495         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 496         POWER_SUPPLY_PROP_CYCLE_COUNT,
 497         POWER_SUPPLY_PROP_ENERGY_NOW,
 498         POWER_SUPPLY_PROP_POWER_AVG,
 499         POWER_SUPPLY_PROP_HEALTH,
 500         POWER_SUPPLY_PROP_MANUFACTURER,
 501 };
 502
 503 static enum power_supply_property bq27510g3_battery_props[] = {
 504         POWER_SUPPLY_PROP_STATUS,
 505         POWER_SUPPLY_PROP_PRESENT,
 506         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 507         POWER_SUPPLY_PROP_CURRENT_NOW,
 508         POWER_SUPPLY_PROP_CAPACITY,
 509         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 510         POWER_SUPPLY_PROP_TEMP,
 511         POWER_SUPPLY_PROP_TIME_TO_EMPTY_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_HEALTH,
 518         POWER_SUPPLY_PROP_MANUFACTURER,
 519 };
 520
 521 static enum power_supply_property bq27520g1_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_ENERGY_NOW,
 536         POWER_SUPPLY_PROP_POWER_AVG,
 537         POWER_SUPPLY_PROP_HEALTH,
 538         POWER_SUPPLY_PROP_MANUFACTURER,
 539 };
 540
 541 static enum power_supply_property bq27530_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_TECHNOLOGY,
 551         POWER_SUPPLY_PROP_CHARGE_FULL,
 552         POWER_SUPPLY_PROP_CHARGE_NOW,
 553         POWER_SUPPLY_PROP_POWER_AVG,
 554         POWER_SUPPLY_PROP_HEALTH,
 555         POWER_SUPPLY_PROP_CYCLE_COUNT,
 556         POWER_SUPPLY_PROP_MANUFACTURER,
 557 };
 558
 559 static enum power_supply_property bq27541_battery_props[] = {
 560         POWER_SUPPLY_PROP_STATUS,
 561         POWER_SUPPLY_PROP_PRESENT,
 562         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 563         POWER_SUPPLY_PROP_CURRENT_NOW,
 564         POWER_SUPPLY_PROP_CAPACITY,
 565         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 566         POWER_SUPPLY_PROP_TEMP,
 567         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 568         POWER_SUPPLY_PROP_TECHNOLOGY,
 569         POWER_SUPPLY_PROP_CHARGE_FULL,
 570         POWER_SUPPLY_PROP_CHARGE_NOW,
 571         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 572         POWER_SUPPLY_PROP_CYCLE_COUNT,
 573         POWER_SUPPLY_PROP_POWER_AVG,
 574         POWER_SUPPLY_PROP_HEALTH,
 575         POWER_SUPPLY_PROP_MANUFACTURER,
 576 };
 577
 578 static enum power_supply_property bq27545_battery_props[] = {
 579         POWER_SUPPLY_PROP_STATUS,
 580         POWER_SUPPLY_PROP_PRESENT,
 581         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 582         POWER_SUPPLY_PROP_CURRENT_NOW,
 583         POWER_SUPPLY_PROP_CAPACITY,
 584         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 585         POWER_SUPPLY_PROP_TEMP,
 586         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 587         POWER_SUPPLY_PROP_TECHNOLOGY,
 588         POWER_SUPPLY_PROP_CHARGE_FULL,
 589         POWER_SUPPLY_PROP_CHARGE_NOW,
 590         POWER_SUPPLY_PROP_HEALTH,
 591         POWER_SUPPLY_PROP_CYCLE_COUNT,
 592         POWER_SUPPLY_PROP_POWER_AVG,
 593         POWER_SUPPLY_PROP_MANUFACTURER,
 594 };
 595
 596 static enum power_supply_property bq27421_battery_props[] = {
 597         POWER_SUPPLY_PROP_STATUS,
 598         POWER_SUPPLY_PROP_PRESENT,
 599         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 600         POWER_SUPPLY_PROP_CURRENT_NOW,
 601         POWER_SUPPLY_PROP_CAPACITY,
 602         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 603         POWER_SUPPLY_PROP_TEMP,
 604         POWER_SUPPLY_PROP_TECHNOLOGY,
 605         POWER_SUPPLY_PROP_CHARGE_FULL,
 606         POWER_SUPPLY_PROP_CHARGE_NOW,
 607         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 608         POWER_SUPPLY_PROP_MANUFACTURER,
 609 };
 610
 611 #define BQ27XXX_PROP(_id, _prop)                \
 612         [_id] = {                               \
 613                 .props = _prop,                 \
 614                 .size = ARRAY_SIZE(_prop),      \
 615         }
 616
 617 static struct {
 618         enum power_supply_property *props;
 619         size_t size;
 620 } bq27xxx_battery_props[] = {
 621         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
 622         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
 623         BQ27XXX_PROP(BQ2750X, bq2750x_battery_props),
 624         BQ27XXX_PROP(BQ2751X, bq2751x_battery_props),
 625         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
 626         BQ27XXX_PROP(BQ27510G1, bq27510g1_battery_props),
 627         BQ27XXX_PROP(BQ27510G2, bq27510g2_battery_props),
 628         BQ27XXX_PROP(BQ27510G3, bq27510g3_battery_props),
 629         BQ27XXX_PROP(BQ27520G1, bq27520g1_battery_props),
 630         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
 631         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
 632         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
 633         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
 634 };
 635
 636 static DEFINE_MUTEX(bq27xxx_list_lock);
 637 static LIST_HEAD(bq27xxx_battery_devices);
 638
 639 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
 640 {
 641         struct bq27xxx_device_info *di;
 642         unsigned int prev_val = *(unsigned int *) kp->arg;
 643         int ret;
 644
 645         ret = param_set_uint(val, kp);
 646         if (ret < 0 || prev_val == *(unsigned int *) kp->arg)
 647                 return ret;
 648
 649         mutex_lock(&bq27xxx_list_lock);
 650         list_for_each_entry(di, &bq27xxx_battery_devices, list) {
 651                 cancel_delayed_work_sync(&di->work);
 652                 schedule_delayed_work(&di->work, 0);
 653         }
 654         mutex_unlock(&bq27xxx_list_lock);
 655
 656         return ret;
 657 }
 658
 659 static const struct kernel_param_ops param_ops_poll_interval = {
 660         .get = param_get_uint,
 661         .set = poll_interval_param_set,
 662 };
 663
 664 static unsigned int poll_interval = 360;
 665 module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
 666 MODULE_PARM_DESC(poll_interval,
 667                  "battery poll interval in seconds - 0 disables polling");
 668
 669 /*
 670  * Common code for BQ27xxx devices
 671  */
 672
 673 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 674                                bool single)
 675 {
 676         /* Reports EINVAL for invalid/missing registers */
 677         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 678                 return -EINVAL;
 679
 680         return di->bus.read(di, di->regs[reg_index], single);
 681 }
 682
 683 /*
 684  * Return the battery State-of-Charge
 685  * Or < 0 if something fails.
 686  */
 687 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 688 {
 689         int soc;
 690
 691         if (di->chip == BQ27000 || di->chip == BQ27010)
 692                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
 693         else
 694                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 695
 696         if (soc < 0)
 697                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 698
 699         return soc;
 700 }
 701
 702 /*
 703  * Return a battery charge value in µAh
 704  * Or < 0 if something fails.
 705  */
 706 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 707 {
 708         int charge;
 709
 710         charge = bq27xxx_read(di, reg, false);
 711         if (charge < 0) {
 712                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 713                         reg, charge);
 714                 return charge;
 715         }
 716
 717         if (di->chip == BQ27000 || di->chip == BQ27010)
 718                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 719         else
 720                 charge *= 1000;
 721
 722         return charge;
 723 }
 724
 725 /*
 726  * Return the battery Nominal available capacity in µAh
 727  * Or < 0 if something fails.
 728  */
 729 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 730 {
 731         int flags;
 732
 733         if (di->chip == BQ27000 || di->chip == BQ27010) {
 734                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 735                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 736                         return -ENODATA;
 737         }
 738
 739         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 740 }
 741
 742 /*
 743  * Return the battery Full Charge Capacity in µAh
 744  * Or < 0 if something fails.
 745  */
 746 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 747 {
 748         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 749 }
 750
 751 /*
 752  * Return the Design Capacity in µAh
 753  * Or < 0 if something fails.
 754  */
 755 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 756 {
 757         int dcap;
 758
 759         if (di->chip == BQ27000 || di->chip == BQ27010)
 760                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
 761         else
 762                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 763
 764         if (dcap < 0) {
 765                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 766                 return dcap;
 767         }
 768
 769         if (di->chip == BQ27000 || di->chip == BQ27010)
 770                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 771         else
 772                 dcap *= 1000;
 773
 774         return dcap;
 775 }
 776
 777 /*
 778  * Return the battery Available energy in µWh
 779  * Or < 0 if something fails.
 780  */
 781 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 782 {
 783         int ae;
 784
 785         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 786         if (ae < 0) {
 787                 dev_dbg(di->dev, "error reading available energy\n");
 788                 return ae;
 789         }
 790
 791         if (di->chip == BQ27000 || di->chip == BQ27010)
 792                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 793         else
 794                 ae *= 1000;
 795
 796         return ae;
 797 }
 798
 799 /*
 800  * Return the battery temperature in tenths of degree Kelvin
 801  * Or < 0 if something fails.
 802  */
 803 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 804 {
 805         int temp;
 806
 807         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 808         if (temp < 0) {
 809                 dev_err(di->dev, "error reading temperature\n");
 810                 return temp;
 811         }
 812
 813         if (di->chip == BQ27000 || di->chip == BQ27010)
 814                 temp = 5 * temp / 2;
 815
 816         return temp;
 817 }
 818
 819 /*
 820  * Return the battery Cycle count total
 821  * Or < 0 if something fails.
 822  */
 823 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 824 {
 825         int cyct;
 826
 827         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 828         if (cyct < 0)
 829                 dev_err(di->dev, "error reading cycle count total\n");
 830
 831         return cyct;
 832 }
 833
 834 /*
 835  * Read a time register.
 836  * Return < 0 if something fails.
 837  */
 838 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 839 {
 840         int tval;
 841
 842         tval = bq27xxx_read(di, reg, false);
 843         if (tval < 0) {
 844                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 845                         reg, tval);
 846                 return tval;
 847         }
 848
 849         if (tval == 65535)
 850                 return -ENODATA;
 851
 852         return tval * 60;
 853 }
 854
 855 /*
 856  * Read an average power register.
 857  * Return < 0 if something fails.
 858  */
 859 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 860 {
 861         int tval;
 862
 863         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 864         if (tval < 0) {
 865                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 866                         BQ27XXX_REG_AP, tval);
 867                 return tval;
 868         }
 869
 870         if (di->chip == BQ27000 || di->chip == BQ27010)
 871                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 872         else
 873                 return tval;
 874 }
 875
 876 /*
 877  * Returns true if a battery over temperature condition is detected
 878  */
 879 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
 880 {
 881         switch (di->chip) {
 882         case BQ2750X:
 883         case BQ2751X:
 884         case BQ27500:
 885         case BQ27510G1:
 886         case BQ27510G2:
 887         case BQ27510G3:
 888         case BQ27520G1:
 889         case BQ27541:
 890         case BQ27545:
 891                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 892         case BQ27530:
 893         case BQ27421:
 894                 return flags & BQ27XXX_FLAG_OT;
 895         default:
 896                 return false;
 897         }
 898 }
 899
 900 /*
 901  * Returns true if a battery under temperature condition is detected
 902  */
 903 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
 904 {
 905         if (di->chip == BQ27530 || di->chip == BQ27421)
 906                 return flags & BQ27XXX_FLAG_UT;
 907
 908         return false;
 909 }
 910
 911 /*
 912  * Returns true if a low state of charge condition is detected
 913  */
 914 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
 915 {
 916         if (di->chip == BQ27000 || di->chip == BQ27010)
 917                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
 918         else
 919                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
 920 }
 921
 922 /*
 923  * Read flag register.
 924  * Return < 0 if something fails.
 925  */
 926 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
 927 {
 928         int flags;
 929         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 930
 931         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 932         if (flags < 0) {
 933                 dev_err(di->dev, "error reading flag register:%d\n", flags);
 934                 return flags;
 935         }
 936
 937         /* Unlikely but important to return first */
 938         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
 939                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 940         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
 941                 return POWER_SUPPLY_HEALTH_COLD;
 942         if (unlikely(bq27xxx_battery_dead(di, flags)))
 943                 return POWER_SUPPLY_HEALTH_DEAD;
 944
 945         return POWER_SUPPLY_HEALTH_GOOD;
 946 }
 947
 948 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
 949 {
 950         struct bq27xxx_reg_cache cache = {0, };
 951         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
 952         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 953
 954         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 955         if ((cache.flags & 0xff) == 0xff)
 956                 cache.flags = -1; /* read error */
 957         if (cache.flags >= 0) {
 958                 cache.temperature = bq27xxx_battery_read_temperature(di);
 959                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
 960                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
 961                         cache.capacity = -ENODATA;
 962                         cache.energy = -ENODATA;
 963                         cache.time_to_empty = -ENODATA;
 964                         cache.time_to_empty_avg = -ENODATA;
 965                         cache.time_to_full = -ENODATA;
 966                         cache.charge_full = -ENODATA;
 967                         cache.health = -ENODATA;
 968                 } else {
 969                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
 970                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
 971                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
 972                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
 973                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
 974                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
 975                         cache.charge_full = bq27xxx_battery_read_fcc(di);
 976                         cache.capacity = bq27xxx_battery_read_soc(di);
 977                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
 978                                 cache.energy = bq27xxx_battery_read_energy(di);
 979                         cache.health = bq27xxx_battery_read_health(di);
 980                 }
 981                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
 982                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
 983                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
 984                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
 985
 986                 /* We only have to read charge design full once */
 987                 if (di->charge_design_full <= 0)
 988                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
 989         }
 990
 991         if (di->cache.capacity != cache.capacity)
 992                 power_supply_changed(di->bat);
 993
 994         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 995                 di->cache = cache;
 996
 997         di->last_update = jiffies;
 998 }
 999 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
1000
1001 static void bq27xxx_battery_poll(struct work_struct *work)
1002 {
1003         struct bq27xxx_device_info *di =
1004                         container_of(work, struct bq27xxx_device_info,
1005                                      work.work);
1006
1007         bq27xxx_battery_update(di);
1008
1009         if (poll_interval > 0)
1010                 schedule_delayed_work(&di->work, poll_interval * HZ);
1011 }
1012
1013 /*
1014  * Return the battery average current in µA
1015  * Note that current can be negative signed as well
1016  * Or 0 if something fails.
1017  */
1018 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
1019                                    union power_supply_propval *val)
1020 {
1021         int curr;
1022         int flags;
1023
1024         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
1025         if (curr < 0) {
1026                 dev_err(di->dev, "error reading current\n");
1027                 return curr;
1028         }
1029
1030         if (di->chip == BQ27000 || di->chip == BQ27010) {
1031                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
1032                 if (flags & BQ27000_FLAG_CHGS) {
1033                         dev_dbg(di->dev, "negative current!\n");
1034                         curr = -curr;
1035                 }
1036
1037                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
1038         } else {
1039                 /* Other gauges return signed value */
1040                 val->intval = (int)((s16)curr) * 1000;
1041         }
1042
1043         return 0;
1044 }
1045
1046 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
1047                                   union power_supply_propval *val)
1048 {
1049         int status;
1050
1051         if (di->chip == BQ27000 || di->chip == BQ27010) {
1052                 if (di->cache.flags & BQ27000_FLAG_FC)
1053                         status = POWER_SUPPLY_STATUS_FULL;
1054                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
1055                         status = POWER_SUPPLY_STATUS_CHARGING;
1056                 else if (power_supply_am_i_supplied(di->bat))
1057                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1058                 else
1059                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1060         } else {
1061                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1062                         status = POWER_SUPPLY_STATUS_FULL;
1063                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
1064                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1065                 else
1066                         status = POWER_SUPPLY_STATUS_CHARGING;
1067         }
1068
1069         val->intval = status;
1070
1071         return 0;
1072 }
1073
1074 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
1075                                           union power_supply_propval *val)
1076 {
1077         int level;
1078
1079         if (di->chip == BQ27000 || di->chip == BQ27010) {
1080                 if (di->cache.flags & BQ27000_FLAG_FC)
1081                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1082                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
1083                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1084                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
1085                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1086                 else
1087                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1088         } else {
1089                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1090                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1091                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
1092                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1093                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
1094                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1095                 else
1096                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1097         }
1098
1099         val->intval = level;
1100
1101         return 0;
1102 }
1103
1104 /*
1105  * Return the battery Voltage in millivolts
1106  * Or < 0 if something fails.
1107  */
1108 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
1109                                    union power_supply_propval *val)
1110 {
1111         int volt;
1112
1113         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
1114         if (volt < 0) {
1115                 dev_err(di->dev, "error reading voltage\n");
1116                 return volt;
1117         }
1118
1119         val->intval = volt * 1000;
1120
1121         return 0;
1122 }
1123
1124 static int bq27xxx_simple_value(int value,
1125                                 union power_supply_propval *val)
1126 {
1127         if (value < 0)
1128                 return value;
1129
1130         val->intval = value;
1131
1132         return 0;
1133 }
1134
1135 static int bq27xxx_battery_get_property(struct power_supply *psy,
1136                                         enum power_supply_property psp,
1137                                         union power_supply_propval *val)
1138 {
1139         int ret = 0;
1140         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1141
1142         mutex_lock(&di->lock);
1143         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
1144                 cancel_delayed_work_sync(&di->work);
1145                 bq27xxx_battery_poll(&di->work.work);
1146         }
1147         mutex_unlock(&di->lock);
1148
1149         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
1150                 return -ENODEV;
1151
1152         switch (psp) {
1153         case POWER_SUPPLY_PROP_STATUS:
1154                 ret = bq27xxx_battery_status(di, val);
1155                 break;
1156         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1157                 ret = bq27xxx_battery_voltage(di, val);
1158                 break;
1159         case POWER_SUPPLY_PROP_PRESENT:
1160                 val->intval = di->cache.flags < 0 ? 0 : 1;
1161                 break;
1162         case POWER_SUPPLY_PROP_CURRENT_NOW:
1163                 ret = bq27xxx_battery_current(di, val);
1164                 break;
1165         case POWER_SUPPLY_PROP_CAPACITY:
1166                 ret = bq27xxx_simple_value(di->cache.capacity, val);
1167                 break;
1168         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1169                 ret = bq27xxx_battery_capacity_level(di, val);
1170                 break;
1171         case POWER_SUPPLY_PROP_TEMP:
1172                 ret = bq27xxx_simple_value(di->cache.temperature, val);
1173                 if (ret == 0)
1174                         val->intval -= 2731; /* convert decidegree k to c */
1175                 break;
1176         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
1177                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
1178                 break;
1179         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
1180                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
1181                 break;
1182         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
1183                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
1184                 break;
1185         case POWER_SUPPLY_PROP_TECHNOLOGY:
1186                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
1187                 break;
1188         case POWER_SUPPLY_PROP_CHARGE_NOW:
1189                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
1190                 break;
1191         case POWER_SUPPLY_PROP_CHARGE_FULL:
1192                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
1193                 break;
1194         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1195                 ret = bq27xxx_simple_value(di->charge_design_full, val);
1196                 break;
1197         case POWER_SUPPLY_PROP_CYCLE_COUNT:
1198                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
1199                 break;
1200         case POWER_SUPPLY_PROP_ENERGY_NOW:
1201                 ret = bq27xxx_simple_value(di->cache.energy, val);
1202                 break;
1203         case POWER_SUPPLY_PROP_POWER_AVG:
1204                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
1205                 break;
1206         case POWER_SUPPLY_PROP_HEALTH:
1207                 ret = bq27xxx_simple_value(di->cache.health, val);
1208                 break;
1209         case POWER_SUPPLY_PROP_MANUFACTURER:
1210                 val->strval = BQ27XXX_MANUFACTURER;
1211                 break;
1212         default:
1213                 return -EINVAL;
1214         }
1215
1216         return ret;
1217 }
1218
1219 static void bq27xxx_external_power_changed(struct power_supply *psy)
1220 {
1221         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1222
1223         cancel_delayed_work_sync(&di->work);
1224         schedule_delayed_work(&di->work, 0);
1225 }
1226
1227 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1228 {
1229         struct power_supply_desc *psy_desc;
1230         struct power_supply_config psy_cfg = { .drv_data = di, };
1231
1232         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1233         mutex_init(&di->lock);
1234         di->regs = bq27xxx_regs[di->chip];
1235
1236         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1237         if (!psy_desc)
1238                 return -ENOMEM;
1239
1240         psy_desc->name = di->name;
1241         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1242         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
1243         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
1244         psy_desc->get_property = bq27xxx_battery_get_property;
1245         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1246
1247         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1248         if (IS_ERR(di->bat)) {
1249                 dev_err(di->dev, "failed to register battery\n");
1250                 return PTR_ERR(di->bat);
1251         }
1252
1253         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1254
1255         bq27xxx_battery_update(di);
1256
1257         mutex_lock(&bq27xxx_list_lock);
1258         list_add(&di->list, &bq27xxx_battery_devices);
1259         mutex_unlock(&bq27xxx_list_lock);
1260
1261         return 0;
1262 }
1263 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1264
1265 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1266 {
1267         /*
1268          * power_supply_unregister call bq27xxx_battery_get_property which
1269          * call bq27xxx_battery_poll.
1270          * Make sure that bq27xxx_battery_poll will not call
1271          * schedule_delayed_work again after unregister (which cause OOPS).
1272          */
1273         poll_interval = 0;
1274
1275         cancel_delayed_work_sync(&di->work);
1276
1277         power_supply_unregister(di->bat);
1278
1279         mutex_lock(&bq27xxx_list_lock);
1280         list_del(&di->list);
1281         mutex_unlock(&bq27xxx_list_lock);
1282
1283         mutex_destroy(&di->lock);
1284 }
1285 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1286
1287 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1288                                          bool single)
1289 {
1290         struct device *dev = di->dev;
1291         struct bq27xxx_platform_data *pdata = dev->platform_data;
1292         unsigned int timeout = 3;
1293         int upper, lower;
1294         int temp;
1295
1296         if (!single) {
1297                 /* Make sure the value has not changed in between reading the
1298                  * lower and the upper part */
1299                 upper = pdata->read(dev, reg + 1);
1300                 do {
1301                         temp = upper;
1302                         if (upper < 0)
1303                                 return upper;
1304
1305                         lower = pdata->read(dev, reg);
1306                         if (lower < 0)
1307                                 return lower;
1308
1309                         upper = pdata->read(dev, reg + 1);
1310                 } while (temp != upper && --timeout);
1311
1312                 if (timeout == 0)
1313                         return -EIO;
1314
1315                 return (upper << 8) | lower;
1316         }
1317
1318         return pdata->read(dev, reg);
1319 }
1320
1321 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1322 {
1323         struct bq27xxx_device_info *di;
1324         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1325
1326         if (!pdata) {
1327                 dev_err(&pdev->dev, "no platform_data supplied\n");
1328                 return -EINVAL;
1329         }
1330
1331         if (!pdata->read) {
1332                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1333                 return -EINVAL;
1334         }
1335
1336         if (!pdata->chip) {
1337                 dev_err(&pdev->dev, "no device supplied\n");
1338                 return -EINVAL;
1339         }
1340
1341         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1342         if (!di)
1343                 return -ENOMEM;
1344
1345         platform_set_drvdata(pdev, di);
1346
1347         di->dev = &pdev->dev;
1348         di->chip = pdata->chip;
1349         di->name = pdata->name ?: dev_name(&pdev->dev);
1350         di->bus.read = bq27xxx_battery_platform_read;
1351
1352         return bq27xxx_battery_setup(di);
1353 }
1354
1355 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1356 {
1357         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1358
1359         bq27xxx_battery_teardown(di);
1360
1361         return 0;
1362 }
1363
1364 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1365         { "bq27000-battery", },
1366         { /* sentinel */ }
1367 };
1368 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1369
1370 #ifdef CONFIG_OF
1371 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1372         { .compatible = "ti,bq27000" },
1373         {},
1374 };
1375 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1376 #endif
1377
1378 static struct platform_driver bq27xxx_battery_platform_driver = {
1379         .probe  = bq27xxx_battery_platform_probe,
1380         .remove = bq27xxx_battery_platform_remove,
1381         .driver = {
1382                 .name = "bq27000-battery",
1383                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1384         },
1385         .id_table = bq27xxx_battery_platform_id_table,
1386 };
1387 module_platform_driver(bq27xxx_battery_platform_driver);
1388
1389 MODULE_ALIAS("platform:bq27000-battery");
1390
1391 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1392 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1393 MODULE_LICENSE("GPL");