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