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-g3
  27  * http://www.ti.com/product/bq27520-g4
  28  * http://www.ti.com/product/bq27530-g1
  29  * http://www.ti.com/product/bq27531-g1
  30  * http://www.ti.com/product/bq27541-g1
  31  * http://www.ti.com/product/bq27542-g1
  32  * http://www.ti.com/product/bq27546-g1
  33  * http://www.ti.com/product/bq27742-g1
  34  * http://www.ti.com/product/bq27545-g1
  35  * http://www.ti.com/product/bq27421-g1
  36  * http://www.ti.com/product/bq27425-g1
  37  * http://www.ti.com/product/bq27411-g1
  38  * http://www.ti.com/product/bq27621-g1
  39  */
  40
  41 #include <linux/device.h>
  42 #include <linux/module.h>
  43 #include <linux/mutex.h>
  44 #include <linux/param.h>
  45 #include <linux/jiffies.h>
  46 #include <linux/workqueue.h>
  47 #include <linux/delay.h>
  48 #include <linux/platform_device.h>
  49 #include <linux/power_supply.h>
  50 #include <linux/slab.h>
  51 #include <linux/of.h>
  52
  53 #include <linux/power/bq27xxx_battery.h>
  54
  55 #define DRIVER_VERSION          "1.2.0"
  56
  57 #define BQ27XXX_MANUFACTURER    "Texas Instruments"
  58
  59 /* BQ27XXX Flags */
  60 #define BQ27XXX_FLAG_DSC        BIT(0)
  61 #define BQ27XXX_FLAG_SOCF       BIT(1) /* State-of-Charge threshold final */
  62 #define BQ27XXX_FLAG_SOC1       BIT(2) /* State-of-Charge threshold 1 */
  63 #define BQ27XXX_FLAG_FC         BIT(9)
  64 #define BQ27XXX_FLAG_OTD        BIT(14)
  65 #define BQ27XXX_FLAG_OTC        BIT(15)
  66 #define BQ27XXX_FLAG_UT         BIT(14)
  67 #define BQ27XXX_FLAG_OT         BIT(15)
  68
  69 /* BQ27000 has different layout for Flags register */
  70 #define BQ27000_FLAG_EDVF       BIT(0) /* Final End-of-Discharge-Voltage flag */
  71 #define BQ27000_FLAG_EDV1       BIT(1) /* First End-of-Discharge-Voltage flag */
  72 #define BQ27000_FLAG_CI         BIT(4) /* Capacity Inaccurate flag */
  73 #define BQ27000_FLAG_FC         BIT(5)
  74 #define BQ27000_FLAG_CHGS       BIT(7) /* Charge state flag */
  75
  76 #define BQ27XXX_RS                      (20) /* Resistor sense mOhm */
  77 #define BQ27XXX_POWER_CONSTANT          (29200) /* 29.2 µV^2 * 1000 */
  78 #define BQ27XXX_CURRENT_CONSTANT        (3570) /* 3.57 µV * 1000 */
  79
  80 #define INVALID_REG_ADDR        0xff
  81
  82 /*
  83  * bq27xxx_reg_index - Register names
  84  *
  85  * These are indexes into a device's register mapping array.
  86  */
  87
  88 enum bq27xxx_reg_index {
  89         BQ27XXX_REG_CTRL = 0,   /* Control */
  90         BQ27XXX_REG_TEMP,       /* Temperature */
  91         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
  92         BQ27XXX_REG_VOLT,       /* Voltage */
  93         BQ27XXX_REG_AI,         /* Average Current */
  94         BQ27XXX_REG_FLAGS,      /* Flags */
  95         BQ27XXX_REG_TTE,        /* Time-to-Empty */
  96         BQ27XXX_REG_TTF,        /* Time-to-Full */
  97         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
  98         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
  99         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
 100         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
 101         BQ27XXX_REG_CYCT,       /* Cycle Count */
 102         BQ27XXX_REG_AE,         /* Available Energy */
 103         BQ27XXX_REG_SOC,        /* State-of-Charge */
 104         BQ27XXX_REG_DCAP,       /* Design Capacity */
 105         BQ27XXX_REG_AP,         /* Average Power */
 106         BQ27XXX_REG_MAX,        /* sentinel */
 107 };
 108
 109 /* Register mappings */
 110 static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 111         [BQ27000] = {
 112                 [BQ27XXX_REG_CTRL] = 0x00,
 113                 [BQ27XXX_REG_TEMP] = 0x06,
 114                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 115                 [BQ27XXX_REG_VOLT] = 0x08,
 116                 [BQ27XXX_REG_AI] = 0x14,
 117                 [BQ27XXX_REG_FLAGS] = 0x0a,
 118                 [BQ27XXX_REG_TTE] = 0x16,
 119                 [BQ27XXX_REG_TTF] = 0x18,
 120                 [BQ27XXX_REG_TTES] = 0x1c,
 121                 [BQ27XXX_REG_TTECP] = 0x26,
 122                 [BQ27XXX_REG_NAC] = 0x0c,
 123                 [BQ27XXX_REG_FCC] = 0x12,
 124                 [BQ27XXX_REG_CYCT] = 0x2a,
 125                 [BQ27XXX_REG_AE] = 0x22,
 126                 [BQ27XXX_REG_SOC] = 0x0b,
 127                 [BQ27XXX_REG_DCAP] = 0x76,
 128                 [BQ27XXX_REG_AP] = 0x24,
 129         },
 130         [BQ27010] = {
 131                 [BQ27XXX_REG_CTRL] = 0x00,
 132                 [BQ27XXX_REG_TEMP] = 0x06,
 133                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 134                 [BQ27XXX_REG_VOLT] = 0x08,
 135                 [BQ27XXX_REG_AI] = 0x14,
 136                 [BQ27XXX_REG_FLAGS] = 0x0a,
 137                 [BQ27XXX_REG_TTE] = 0x16,
 138                 [BQ27XXX_REG_TTF] = 0x18,
 139                 [BQ27XXX_REG_TTES] = 0x1c,
 140                 [BQ27XXX_REG_TTECP] = 0x26,
 141                 [BQ27XXX_REG_NAC] = 0x0c,
 142                 [BQ27XXX_REG_FCC] = 0x12,
 143                 [BQ27XXX_REG_CYCT] = 0x2a,
 144                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 145                 [BQ27XXX_REG_SOC] = 0x0b,
 146                 [BQ27XXX_REG_DCAP] = 0x76,
 147                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 148         },
 149         [BQ2750X] = {
 150                 [BQ27XXX_REG_CTRL] = 0x00,
 151                 [BQ27XXX_REG_TEMP] = 0x06,
 152                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 153                 [BQ27XXX_REG_VOLT] = 0x08,
 154                 [BQ27XXX_REG_AI] = 0x14,
 155                 [BQ27XXX_REG_FLAGS] = 0x0a,
 156                 [BQ27XXX_REG_TTE] = 0x16,
 157                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 158                 [BQ27XXX_REG_TTES] = 0x1a,
 159                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 160                 [BQ27XXX_REG_NAC] = 0x0c,
 161                 [BQ27XXX_REG_FCC] = 0x12,
 162                 [BQ27XXX_REG_CYCT] = 0x2a,
 163                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 164                 [BQ27XXX_REG_SOC] = 0x2c,
 165                 [BQ27XXX_REG_DCAP] = 0x3c,
 166                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 167         },
 168         [BQ2751X] = {
 169                 [BQ27XXX_REG_CTRL] = 0x00,
 170                 [BQ27XXX_REG_TEMP] = 0x06,
 171                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 172                 [BQ27XXX_REG_VOLT] = 0x08,
 173                 [BQ27XXX_REG_AI] = 0x14,
 174                 [BQ27XXX_REG_FLAGS] = 0x0a,
 175                 [BQ27XXX_REG_TTE] = 0x16,
 176                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 177                 [BQ27XXX_REG_TTES] = 0x1a,
 178                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 179                 [BQ27XXX_REG_NAC] = 0x0c,
 180                 [BQ27XXX_REG_FCC] = 0x12,
 181                 [BQ27XXX_REG_CYCT] = 0x1e,
 182                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 183                 [BQ27XXX_REG_SOC] = 0x20,
 184                 [BQ27XXX_REG_DCAP] = 0x2e,
 185                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 186         },
 187         [BQ27500] = {
 188                 [BQ27XXX_REG_CTRL] = 0x00,
 189                 [BQ27XXX_REG_TEMP] = 0x06,
 190                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 191                 [BQ27XXX_REG_VOLT] = 0x08,
 192                 [BQ27XXX_REG_AI] = 0x14,
 193                 [BQ27XXX_REG_FLAGS] = 0x0a,
 194                 [BQ27XXX_REG_TTE] = 0x16,
 195                 [BQ27XXX_REG_TTF] = 0x18,
 196                 [BQ27XXX_REG_TTES] = 0x1c,
 197                 [BQ27XXX_REG_TTECP] = 0x26,
 198                 [BQ27XXX_REG_NAC] = 0x0c,
 199                 [BQ27XXX_REG_FCC] = 0x12,
 200                 [BQ27XXX_REG_CYCT] = 0x2a,
 201                 [BQ27XXX_REG_AE] = 0x22,
 202                 [BQ27XXX_REG_SOC] = 0x2c,
 203                 [BQ27XXX_REG_DCAP] = 0x3c,
 204                 [BQ27XXX_REG_AP] = 0x24,
 205         },
 206         [BQ27510G1] = {
 207                 [BQ27XXX_REG_CTRL] = 0x00,
 208                 [BQ27XXX_REG_TEMP] = 0x06,
 209                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 210                 [BQ27XXX_REG_VOLT] = 0x08,
 211                 [BQ27XXX_REG_AI] = 0x14,
 212                 [BQ27XXX_REG_FLAGS] = 0x0a,
 213                 [BQ27XXX_REG_TTE] = 0x16,
 214                 [BQ27XXX_REG_TTF] = 0x18,
 215                 [BQ27XXX_REG_TTES] = 0x1c,
 216                 [BQ27XXX_REG_TTECP] = 0x26,
 217                 [BQ27XXX_REG_NAC] = 0x0c,
 218                 [BQ27XXX_REG_FCC] = 0x12,
 219                 [BQ27XXX_REG_CYCT] = 0x2a,
 220                 [BQ27XXX_REG_AE] = 0x22,
 221                 [BQ27XXX_REG_SOC] = 0x2c,
 222                 [BQ27XXX_REG_DCAP] = 0x3c,
 223                 [BQ27XXX_REG_AP] = 0x24,
 224         },
 225         [BQ27530] = {
 226                 [BQ27XXX_REG_CTRL] = 0x00,
 227                 [BQ27XXX_REG_TEMP] = 0x06,
 228                 [BQ27XXX_REG_INT_TEMP] = 0x32,
 229                 [BQ27XXX_REG_VOLT] = 0x08,
 230                 [BQ27XXX_REG_AI] = 0x14,
 231                 [BQ27XXX_REG_FLAGS] = 0x0a,
 232                 [BQ27XXX_REG_TTE] = 0x16,
 233                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 234                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 235                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 236                 [BQ27XXX_REG_NAC] = 0x0c,
 237                 [BQ27XXX_REG_FCC] = 0x12,
 238                 [BQ27XXX_REG_CYCT] = 0x2a,
 239                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 240                 [BQ27XXX_REG_SOC] = 0x2c,
 241                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 242                 [BQ27XXX_REG_AP] = 0x24,
 243         },
 244         [BQ27541] = {
 245                 [BQ27XXX_REG_CTRL] = 0x00,
 246                 [BQ27XXX_REG_TEMP] = 0x06,
 247                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 248                 [BQ27XXX_REG_VOLT] = 0x08,
 249                 [BQ27XXX_REG_AI] = 0x14,
 250                 [BQ27XXX_REG_FLAGS] = 0x0a,
 251                 [BQ27XXX_REG_TTE] = 0x16,
 252                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 253                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 254                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 255                 [BQ27XXX_REG_NAC] = 0x0c,
 256                 [BQ27XXX_REG_FCC] = 0x12,
 257                 [BQ27XXX_REG_CYCT] = 0x2a,
 258                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 259                 [BQ27XXX_REG_SOC] = 0x2c,
 260                 [BQ27XXX_REG_DCAP] = 0x3c,
 261                 [BQ27XXX_REG_AP] = 0x24,
 262         },
 263         [BQ27545] = {
 264                 [BQ27XXX_REG_CTRL] = 0x00,
 265                 [BQ27XXX_REG_TEMP] = 0x06,
 266                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 267                 [BQ27XXX_REG_VOLT] = 0x08,
 268                 [BQ27XXX_REG_AI] = 0x14,
 269                 [BQ27XXX_REG_FLAGS] = 0x0a,
 270                 [BQ27XXX_REG_TTE] = 0x16,
 271                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 272                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 273                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 274                 [BQ27XXX_REG_NAC] = 0x0c,
 275                 [BQ27XXX_REG_FCC] = 0x12,
 276                 [BQ27XXX_REG_CYCT] = 0x2a,
 277                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 278                 [BQ27XXX_REG_SOC] = 0x2c,
 279                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 280                 [BQ27XXX_REG_AP] = 0x24,
 281         },
 282         [BQ27421] = {
 283                 [BQ27XXX_REG_CTRL] = 0x00,
 284                 [BQ27XXX_REG_TEMP] = 0x02,
 285                 [BQ27XXX_REG_INT_TEMP] = 0x1e,
 286                 [BQ27XXX_REG_VOLT] = 0x04,
 287                 [BQ27XXX_REG_AI] = 0x10,
 288                 [BQ27XXX_REG_FLAGS] = 0x06,
 289                 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
 290                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 291                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 292                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 293                 [BQ27XXX_REG_NAC] = 0x08,
 294                 [BQ27XXX_REG_FCC] = 0x0e,
 295                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 296                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 297                 [BQ27XXX_REG_SOC] = 0x1c,
 298                 [BQ27XXX_REG_DCAP] = 0x3c,
 299                 [BQ27XXX_REG_AP] = 0x18,
 300         },
 301 };
 302
 303 static enum power_supply_property bq27000_battery_props[] = {
 304         POWER_SUPPLY_PROP_STATUS,
 305         POWER_SUPPLY_PROP_PRESENT,
 306         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 307         POWER_SUPPLY_PROP_CURRENT_NOW,
 308         POWER_SUPPLY_PROP_CAPACITY,
 309         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 310         POWER_SUPPLY_PROP_TEMP,
 311         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 312         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 313         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 314         POWER_SUPPLY_PROP_TECHNOLOGY,
 315         POWER_SUPPLY_PROP_CHARGE_FULL,
 316         POWER_SUPPLY_PROP_CHARGE_NOW,
 317         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 318         POWER_SUPPLY_PROP_CYCLE_COUNT,
 319         POWER_SUPPLY_PROP_ENERGY_NOW,
 320         POWER_SUPPLY_PROP_POWER_AVG,
 321         POWER_SUPPLY_PROP_HEALTH,
 322         POWER_SUPPLY_PROP_MANUFACTURER,
 323 };
 324
 325 static enum power_supply_property bq27010_battery_props[] = {
 326         POWER_SUPPLY_PROP_STATUS,
 327         POWER_SUPPLY_PROP_PRESENT,
 328         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 329         POWER_SUPPLY_PROP_CURRENT_NOW,
 330         POWER_SUPPLY_PROP_CAPACITY,
 331         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 332         POWER_SUPPLY_PROP_TEMP,
 333         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 334         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 335         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 336         POWER_SUPPLY_PROP_TECHNOLOGY,
 337         POWER_SUPPLY_PROP_CHARGE_FULL,
 338         POWER_SUPPLY_PROP_CHARGE_NOW,
 339         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 340         POWER_SUPPLY_PROP_CYCLE_COUNT,
 341         POWER_SUPPLY_PROP_HEALTH,
 342         POWER_SUPPLY_PROP_MANUFACTURER,
 343 };
 344
 345 static enum power_supply_property bq2750x_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_TECHNOLOGY,
 355         POWER_SUPPLY_PROP_CHARGE_FULL,
 356         POWER_SUPPLY_PROP_CHARGE_NOW,
 357         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 358         POWER_SUPPLY_PROP_CYCLE_COUNT,
 359         POWER_SUPPLY_PROP_HEALTH,
 360         POWER_SUPPLY_PROP_MANUFACTURER,
 361 };
 362
 363 static enum power_supply_property bq2751x_battery_props[] = {
 364         POWER_SUPPLY_PROP_STATUS,
 365         POWER_SUPPLY_PROP_PRESENT,
 366         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 367         POWER_SUPPLY_PROP_CURRENT_NOW,
 368         POWER_SUPPLY_PROP_CAPACITY,
 369         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 370         POWER_SUPPLY_PROP_TEMP,
 371         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 372         POWER_SUPPLY_PROP_TECHNOLOGY,
 373         POWER_SUPPLY_PROP_CHARGE_FULL,
 374         POWER_SUPPLY_PROP_CHARGE_NOW,
 375         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 376         POWER_SUPPLY_PROP_CYCLE_COUNT,
 377         POWER_SUPPLY_PROP_HEALTH,
 378         POWER_SUPPLY_PROP_MANUFACTURER,
 379 };
 380
 381 static enum power_supply_property bq27500_battery_props[] = {
 382         POWER_SUPPLY_PROP_STATUS,
 383         POWER_SUPPLY_PROP_PRESENT,
 384         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 385         POWER_SUPPLY_PROP_CURRENT_NOW,
 386         POWER_SUPPLY_PROP_CAPACITY,
 387         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 388         POWER_SUPPLY_PROP_TEMP,
 389         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 390         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 391         POWER_SUPPLY_PROP_TECHNOLOGY,
 392         POWER_SUPPLY_PROP_CHARGE_FULL,
 393         POWER_SUPPLY_PROP_CHARGE_NOW,
 394         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 395         POWER_SUPPLY_PROP_CYCLE_COUNT,
 396         POWER_SUPPLY_PROP_ENERGY_NOW,
 397         POWER_SUPPLY_PROP_POWER_AVG,
 398         POWER_SUPPLY_PROP_HEALTH,
 399         POWER_SUPPLY_PROP_MANUFACTURER,
 400 };
 401
 402 static enum power_supply_property bq27510g1_battery_props[] = {
 403         POWER_SUPPLY_PROP_STATUS,
 404         POWER_SUPPLY_PROP_PRESENT,
 405         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 406         POWER_SUPPLY_PROP_CURRENT_NOW,
 407         POWER_SUPPLY_PROP_CAPACITY,
 408         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 409         POWER_SUPPLY_PROP_TEMP,
 410         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 411         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 412         POWER_SUPPLY_PROP_TECHNOLOGY,
 413         POWER_SUPPLY_PROP_CHARGE_FULL,
 414         POWER_SUPPLY_PROP_CHARGE_NOW,
 415         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 416         POWER_SUPPLY_PROP_CYCLE_COUNT,
 417         POWER_SUPPLY_PROP_ENERGY_NOW,
 418         POWER_SUPPLY_PROP_POWER_AVG,
 419         POWER_SUPPLY_PROP_HEALTH,
 420         POWER_SUPPLY_PROP_MANUFACTURER,
 421 };
 422
 423 static enum power_supply_property bq27530_battery_props[] = {
 424         POWER_SUPPLY_PROP_STATUS,
 425         POWER_SUPPLY_PROP_PRESENT,
 426         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 427         POWER_SUPPLY_PROP_CURRENT_NOW,
 428         POWER_SUPPLY_PROP_CAPACITY,
 429         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 430         POWER_SUPPLY_PROP_TEMP,
 431         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 432         POWER_SUPPLY_PROP_TECHNOLOGY,
 433         POWER_SUPPLY_PROP_CHARGE_FULL,
 434         POWER_SUPPLY_PROP_CHARGE_NOW,
 435         POWER_SUPPLY_PROP_POWER_AVG,
 436         POWER_SUPPLY_PROP_HEALTH,
 437         POWER_SUPPLY_PROP_CYCLE_COUNT,
 438         POWER_SUPPLY_PROP_MANUFACTURER,
 439 };
 440
 441 static enum power_supply_property bq27541_battery_props[] = {
 442         POWER_SUPPLY_PROP_STATUS,
 443         POWER_SUPPLY_PROP_PRESENT,
 444         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 445         POWER_SUPPLY_PROP_CURRENT_NOW,
 446         POWER_SUPPLY_PROP_CAPACITY,
 447         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 448         POWER_SUPPLY_PROP_TEMP,
 449         POWER_SUPPLY_PROP_TIME_TO_EMPTY_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_POWER_AVG,
 456         POWER_SUPPLY_PROP_HEALTH,
 457         POWER_SUPPLY_PROP_MANUFACTURER,
 458 };
 459
 460 static enum power_supply_property bq27545_battery_props[] = {
 461         POWER_SUPPLY_PROP_STATUS,
 462         POWER_SUPPLY_PROP_PRESENT,
 463         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 464         POWER_SUPPLY_PROP_CURRENT_NOW,
 465         POWER_SUPPLY_PROP_CAPACITY,
 466         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 467         POWER_SUPPLY_PROP_TEMP,
 468         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 469         POWER_SUPPLY_PROP_TECHNOLOGY,
 470         POWER_SUPPLY_PROP_CHARGE_FULL,
 471         POWER_SUPPLY_PROP_CHARGE_NOW,
 472         POWER_SUPPLY_PROP_HEALTH,
 473         POWER_SUPPLY_PROP_CYCLE_COUNT,
 474         POWER_SUPPLY_PROP_POWER_AVG,
 475         POWER_SUPPLY_PROP_MANUFACTURER,
 476 };
 477
 478 static enum power_supply_property bq27421_battery_props[] = {
 479         POWER_SUPPLY_PROP_STATUS,
 480         POWER_SUPPLY_PROP_PRESENT,
 481         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 482         POWER_SUPPLY_PROP_CURRENT_NOW,
 483         POWER_SUPPLY_PROP_CAPACITY,
 484         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 485         POWER_SUPPLY_PROP_TEMP,
 486         POWER_SUPPLY_PROP_TECHNOLOGY,
 487         POWER_SUPPLY_PROP_CHARGE_FULL,
 488         POWER_SUPPLY_PROP_CHARGE_NOW,
 489         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 490         POWER_SUPPLY_PROP_MANUFACTURER,
 491 };
 492
 493 #define BQ27XXX_PROP(_id, _prop)                \
 494         [_id] = {                               \
 495                 .props = _prop,                 \
 496                 .size = ARRAY_SIZE(_prop),      \
 497         }
 498
 499 static struct {
 500         enum power_supply_property *props;
 501         size_t size;
 502 } bq27xxx_battery_props[] = {
 503         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
 504         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
 505         BQ27XXX_PROP(BQ2750X, bq2750x_battery_props),
 506         BQ27XXX_PROP(BQ2751X, bq2751x_battery_props),
 507         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
 508         BQ27XXX_PROP(BQ27510G1, bq27510g1_battery_props),
 509         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
 510         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
 511         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
 512         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
 513 };
 514
 515 static DEFINE_MUTEX(bq27xxx_list_lock);
 516 static LIST_HEAD(bq27xxx_battery_devices);
 517
 518 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
 519 {
 520         struct bq27xxx_device_info *di;
 521         unsigned int prev_val = *(unsigned int *) kp->arg;
 522         int ret;
 523
 524         ret = param_set_uint(val, kp);
 525         if (ret < 0 || prev_val == *(unsigned int *) kp->arg)
 526                 return ret;
 527
 528         mutex_lock(&bq27xxx_list_lock);
 529         list_for_each_entry(di, &bq27xxx_battery_devices, list) {
 530                 cancel_delayed_work_sync(&di->work);
 531                 schedule_delayed_work(&di->work, 0);
 532         }
 533         mutex_unlock(&bq27xxx_list_lock);
 534
 535         return ret;
 536 }
 537
 538 static const struct kernel_param_ops param_ops_poll_interval = {
 539         .get = param_get_uint,
 540         .set = poll_interval_param_set,
 541 };
 542
 543 static unsigned int poll_interval = 360;
 544 module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
 545 MODULE_PARM_DESC(poll_interval,
 546                  "battery poll interval in seconds - 0 disables polling");
 547
 548 /*
 549  * Common code for BQ27xxx devices
 550  */
 551
 552 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 553                                bool single)
 554 {
 555         /* Reports EINVAL for invalid/missing registers */
 556         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 557                 return -EINVAL;
 558
 559         return di->bus.read(di, di->regs[reg_index], single);
 560 }
 561
 562 /*
 563  * Return the battery State-of-Charge
 564  * Or < 0 if something fails.
 565  */
 566 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 567 {
 568         int soc;
 569
 570         if (di->chip == BQ27000 || di->chip == BQ27010)
 571                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
 572         else
 573                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 574
 575         if (soc < 0)
 576                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 577
 578         return soc;
 579 }
 580
 581 /*
 582  * Return a battery charge value in µAh
 583  * Or < 0 if something fails.
 584  */
 585 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 586 {
 587         int charge;
 588
 589         charge = bq27xxx_read(di, reg, false);
 590         if (charge < 0) {
 591                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 592                         reg, charge);
 593                 return charge;
 594         }
 595
 596         if (di->chip == BQ27000 || di->chip == BQ27010)
 597                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 598         else
 599                 charge *= 1000;
 600
 601         return charge;
 602 }
 603
 604 /*
 605  * Return the battery Nominal available capacity in µAh
 606  * Or < 0 if something fails.
 607  */
 608 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 609 {
 610         int flags;
 611
 612         if (di->chip == BQ27000 || di->chip == BQ27010) {
 613                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 614                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 615                         return -ENODATA;
 616         }
 617
 618         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 619 }
 620
 621 /*
 622  * Return the battery Full Charge Capacity in µAh
 623  * Or < 0 if something fails.
 624  */
 625 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 626 {
 627         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 628 }
 629
 630 /*
 631  * Return the Design Capacity in µAh
 632  * Or < 0 if something fails.
 633  */
 634 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 635 {
 636         int dcap;
 637
 638         if (di->chip == BQ27000 || di->chip == BQ27010)
 639                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
 640         else
 641                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 642
 643         if (dcap < 0) {
 644                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 645                 return dcap;
 646         }
 647
 648         if (di->chip == BQ27000 || di->chip == BQ27010)
 649                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 650         else
 651                 dcap *= 1000;
 652
 653         return dcap;
 654 }
 655
 656 /*
 657  * Return the battery Available energy in µWh
 658  * Or < 0 if something fails.
 659  */
 660 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 661 {
 662         int ae;
 663
 664         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 665         if (ae < 0) {
 666                 dev_dbg(di->dev, "error reading available energy\n");
 667                 return ae;
 668         }
 669
 670         if (di->chip == BQ27000 || di->chip == BQ27010)
 671                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 672         else
 673                 ae *= 1000;
 674
 675         return ae;
 676 }
 677
 678 /*
 679  * Return the battery temperature in tenths of degree Kelvin
 680  * Or < 0 if something fails.
 681  */
 682 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 683 {
 684         int temp;
 685
 686         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 687         if (temp < 0) {
 688                 dev_err(di->dev, "error reading temperature\n");
 689                 return temp;
 690         }
 691
 692         if (di->chip == BQ27000 || di->chip == BQ27010)
 693                 temp = 5 * temp / 2;
 694
 695         return temp;
 696 }
 697
 698 /*
 699  * Return the battery Cycle count total
 700  * Or < 0 if something fails.
 701  */
 702 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 703 {
 704         int cyct;
 705
 706         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 707         if (cyct < 0)
 708                 dev_err(di->dev, "error reading cycle count total\n");
 709
 710         return cyct;
 711 }
 712
 713 /*
 714  * Read a time register.
 715  * Return < 0 if something fails.
 716  */
 717 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 718 {
 719         int tval;
 720
 721         tval = bq27xxx_read(di, reg, false);
 722         if (tval < 0) {
 723                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 724                         reg, tval);
 725                 return tval;
 726         }
 727
 728         if (tval == 65535)
 729                 return -ENODATA;
 730
 731         return tval * 60;
 732 }
 733
 734 /*
 735  * Read an average power register.
 736  * Return < 0 if something fails.
 737  */
 738 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 739 {
 740         int tval;
 741
 742         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 743         if (tval < 0) {
 744                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 745                         BQ27XXX_REG_AP, tval);
 746                 return tval;
 747         }
 748
 749         if (di->chip == BQ27000 || di->chip == BQ27010)
 750                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 751         else
 752                 return tval;
 753 }
 754
 755 /*
 756  * Returns true if a battery over temperature condition is detected
 757  */
 758 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
 759 {
 760         switch (di->chip) {
 761         case BQ2750X:
 762         case BQ2751X:
 763         case BQ27500:
 764         case BQ27510G1:
 765         case BQ27541:
 766         case BQ27545:
 767                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 768         case BQ27530:
 769         case BQ27421:
 770                 return flags & BQ27XXX_FLAG_OT;
 771         default:
 772                 return false;
 773         }
 774 }
 775
 776 /*
 777  * Returns true if a battery under temperature condition is detected
 778  */
 779 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
 780 {
 781         if (di->chip == BQ27530 || di->chip == BQ27421)
 782                 return flags & BQ27XXX_FLAG_UT;
 783
 784         return false;
 785 }
 786
 787 /*
 788  * Returns true if a low state of charge condition is detected
 789  */
 790 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
 791 {
 792         if (di->chip == BQ27000 || di->chip == BQ27010)
 793                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
 794         else
 795                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
 796 }
 797
 798 /*
 799  * Read flag register.
 800  * Return < 0 if something fails.
 801  */
 802 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
 803 {
 804         int flags;
 805         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 806
 807         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 808         if (flags < 0) {
 809                 dev_err(di->dev, "error reading flag register:%d\n", flags);
 810                 return flags;
 811         }
 812
 813         /* Unlikely but important to return first */
 814         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
 815                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 816         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
 817                 return POWER_SUPPLY_HEALTH_COLD;
 818         if (unlikely(bq27xxx_battery_dead(di, flags)))
 819                 return POWER_SUPPLY_HEALTH_DEAD;
 820
 821         return POWER_SUPPLY_HEALTH_GOOD;
 822 }
 823
 824 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
 825 {
 826         struct bq27xxx_reg_cache cache = {0, };
 827         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
 828         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 829
 830         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 831         if ((cache.flags & 0xff) == 0xff)
 832                 cache.flags = -1; /* read error */
 833         if (cache.flags >= 0) {
 834                 cache.temperature = bq27xxx_battery_read_temperature(di);
 835                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
 836                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
 837                         cache.capacity = -ENODATA;
 838                         cache.energy = -ENODATA;
 839                         cache.time_to_empty = -ENODATA;
 840                         cache.time_to_empty_avg = -ENODATA;
 841                         cache.time_to_full = -ENODATA;
 842                         cache.charge_full = -ENODATA;
 843                         cache.health = -ENODATA;
 844                 } else {
 845                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
 846                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
 847                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
 848                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
 849                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
 850                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
 851                         cache.charge_full = bq27xxx_battery_read_fcc(di);
 852                         cache.capacity = bq27xxx_battery_read_soc(di);
 853                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
 854                                 cache.energy = bq27xxx_battery_read_energy(di);
 855                         cache.health = bq27xxx_battery_read_health(di);
 856                 }
 857                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
 858                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
 859                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
 860                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
 861
 862                 /* We only have to read charge design full once */
 863                 if (di->charge_design_full <= 0)
 864                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
 865         }
 866
 867         if (di->cache.capacity != cache.capacity)
 868                 power_supply_changed(di->bat);
 869
 870         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 871                 di->cache = cache;
 872
 873         di->last_update = jiffies;
 874 }
 875 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
 876
 877 static void bq27xxx_battery_poll(struct work_struct *work)
 878 {
 879         struct bq27xxx_device_info *di =
 880                         container_of(work, struct bq27xxx_device_info,
 881                                      work.work);
 882
 883         bq27xxx_battery_update(di);
 884
 885         if (poll_interval > 0)
 886                 schedule_delayed_work(&di->work, poll_interval * HZ);
 887 }
 888
 889 /*
 890  * Return the battery average current in µA
 891  * Note that current can be negative signed as well
 892  * Or 0 if something fails.
 893  */
 894 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
 895                                    union power_supply_propval *val)
 896 {
 897         int curr;
 898         int flags;
 899
 900         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
 901         if (curr < 0) {
 902                 dev_err(di->dev, "error reading current\n");
 903                 return curr;
 904         }
 905
 906         if (di->chip == BQ27000 || di->chip == BQ27010) {
 907                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 908                 if (flags & BQ27000_FLAG_CHGS) {
 909                         dev_dbg(di->dev, "negative current!\n");
 910                         curr = -curr;
 911                 }
 912
 913                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 914         } else {
 915                 /* Other gauges return signed value */
 916                 val->intval = (int)((s16)curr) * 1000;
 917         }
 918
 919         return 0;
 920 }
 921
 922 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
 923                                   union power_supply_propval *val)
 924 {
 925         int status;
 926
 927         if (di->chip == BQ27000 || di->chip == BQ27010) {
 928                 if (di->cache.flags & BQ27000_FLAG_FC)
 929                         status = POWER_SUPPLY_STATUS_FULL;
 930                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 931                         status = POWER_SUPPLY_STATUS_CHARGING;
 932                 else if (power_supply_am_i_supplied(di->bat))
 933                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 934                 else
 935                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 936         } else {
 937                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 938                         status = POWER_SUPPLY_STATUS_FULL;
 939                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
 940                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 941                 else
 942                         status = POWER_SUPPLY_STATUS_CHARGING;
 943         }
 944
 945         val->intval = status;
 946
 947         return 0;
 948 }
 949
 950 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
 951                                           union power_supply_propval *val)
 952 {
 953         int level;
 954
 955         if (di->chip == BQ27000 || di->chip == BQ27010) {
 956                 if (di->cache.flags & BQ27000_FLAG_FC)
 957                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 958                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 959                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 960                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 961                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 962                 else
 963                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 964         } else {
 965                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 966                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 967                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
 968                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 969                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
 970                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 971                 else
 972                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 973         }
 974
 975         val->intval = level;
 976
 977         return 0;
 978 }
 979
 980 /*
 981  * Return the battery Voltage in millivolts
 982  * Or < 0 if something fails.
 983  */
 984 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
 985                                    union power_supply_propval *val)
 986 {
 987         int volt;
 988
 989         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
 990         if (volt < 0) {
 991                 dev_err(di->dev, "error reading voltage\n");
 992                 return volt;
 993         }
 994
 995         val->intval = volt * 1000;
 996
 997         return 0;
 998 }
 999
1000 static int bq27xxx_simple_value(int value,
1001                                 union power_supply_propval *val)
1002 {
1003         if (value < 0)
1004                 return value;
1005
1006         val->intval = value;
1007
1008         return 0;
1009 }
1010
1011 static int bq27xxx_battery_get_property(struct power_supply *psy,
1012                                         enum power_supply_property psp,
1013                                         union power_supply_propval *val)
1014 {
1015         int ret = 0;
1016         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1017
1018         mutex_lock(&di->lock);
1019         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
1020                 cancel_delayed_work_sync(&di->work);
1021                 bq27xxx_battery_poll(&di->work.work);
1022         }
1023         mutex_unlock(&di->lock);
1024
1025         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
1026                 return -ENODEV;
1027
1028         switch (psp) {
1029         case POWER_SUPPLY_PROP_STATUS:
1030                 ret = bq27xxx_battery_status(di, val);
1031                 break;
1032         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1033                 ret = bq27xxx_battery_voltage(di, val);
1034                 break;
1035         case POWER_SUPPLY_PROP_PRESENT:
1036                 val->intval = di->cache.flags < 0 ? 0 : 1;
1037                 break;
1038         case POWER_SUPPLY_PROP_CURRENT_NOW:
1039                 ret = bq27xxx_battery_current(di, val);
1040                 break;
1041         case POWER_SUPPLY_PROP_CAPACITY:
1042                 ret = bq27xxx_simple_value(di->cache.capacity, val);
1043                 break;
1044         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1045                 ret = bq27xxx_battery_capacity_level(di, val);
1046                 break;
1047         case POWER_SUPPLY_PROP_TEMP:
1048                 ret = bq27xxx_simple_value(di->cache.temperature, val);
1049                 if (ret == 0)
1050                         val->intval -= 2731; /* convert decidegree k to c */
1051                 break;
1052         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
1053                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
1054                 break;
1055         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
1056                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
1057                 break;
1058         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
1059                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
1060                 break;
1061         case POWER_SUPPLY_PROP_TECHNOLOGY:
1062                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
1063                 break;
1064         case POWER_SUPPLY_PROP_CHARGE_NOW:
1065                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
1066                 break;
1067         case POWER_SUPPLY_PROP_CHARGE_FULL:
1068                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
1069                 break;
1070         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1071                 ret = bq27xxx_simple_value(di->charge_design_full, val);
1072                 break;
1073         case POWER_SUPPLY_PROP_CYCLE_COUNT:
1074                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
1075                 break;
1076         case POWER_SUPPLY_PROP_ENERGY_NOW:
1077                 ret = bq27xxx_simple_value(di->cache.energy, val);
1078                 break;
1079         case POWER_SUPPLY_PROP_POWER_AVG:
1080                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
1081                 break;
1082         case POWER_SUPPLY_PROP_HEALTH:
1083                 ret = bq27xxx_simple_value(di->cache.health, val);
1084                 break;
1085         case POWER_SUPPLY_PROP_MANUFACTURER:
1086                 val->strval = BQ27XXX_MANUFACTURER;
1087                 break;
1088         default:
1089                 return -EINVAL;
1090         }
1091
1092         return ret;
1093 }
1094
1095 static void bq27xxx_external_power_changed(struct power_supply *psy)
1096 {
1097         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1098
1099         cancel_delayed_work_sync(&di->work);
1100         schedule_delayed_work(&di->work, 0);
1101 }
1102
1103 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1104 {
1105         struct power_supply_desc *psy_desc;
1106         struct power_supply_config psy_cfg = { .drv_data = di, };
1107
1108         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1109         mutex_init(&di->lock);
1110         di->regs = bq27xxx_regs[di->chip];
1111
1112         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1113         if (!psy_desc)
1114                 return -ENOMEM;
1115
1116         psy_desc->name = di->name;
1117         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1118         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
1119         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
1120         psy_desc->get_property = bq27xxx_battery_get_property;
1121         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1122
1123         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1124         if (IS_ERR(di->bat)) {
1125                 dev_err(di->dev, "failed to register battery\n");
1126                 return PTR_ERR(di->bat);
1127         }
1128
1129         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1130
1131         bq27xxx_battery_update(di);
1132
1133         mutex_lock(&bq27xxx_list_lock);
1134         list_add(&di->list, &bq27xxx_battery_devices);
1135         mutex_unlock(&bq27xxx_list_lock);
1136
1137         return 0;
1138 }
1139 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1140
1141 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1142 {
1143         /*
1144          * power_supply_unregister call bq27xxx_battery_get_property which
1145          * call bq27xxx_battery_poll.
1146          * Make sure that bq27xxx_battery_poll will not call
1147          * schedule_delayed_work again after unregister (which cause OOPS).
1148          */
1149         poll_interval = 0;
1150
1151         cancel_delayed_work_sync(&di->work);
1152
1153         power_supply_unregister(di->bat);
1154
1155         mutex_lock(&bq27xxx_list_lock);
1156         list_del(&di->list);
1157         mutex_unlock(&bq27xxx_list_lock);
1158
1159         mutex_destroy(&di->lock);
1160 }
1161 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1162
1163 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1164                                          bool single)
1165 {
1166         struct device *dev = di->dev;
1167         struct bq27xxx_platform_data *pdata = dev->platform_data;
1168         unsigned int timeout = 3;
1169         int upper, lower;
1170         int temp;
1171
1172         if (!single) {
1173                 /* Make sure the value has not changed in between reading the
1174                  * lower and the upper part */
1175                 upper = pdata->read(dev, reg + 1);
1176                 do {
1177                         temp = upper;
1178                         if (upper < 0)
1179                                 return upper;
1180
1181                         lower = pdata->read(dev, reg);
1182                         if (lower < 0)
1183                                 return lower;
1184
1185                         upper = pdata->read(dev, reg + 1);
1186                 } while (temp != upper && --timeout);
1187
1188                 if (timeout == 0)
1189                         return -EIO;
1190
1191                 return (upper << 8) | lower;
1192         }
1193
1194         return pdata->read(dev, reg);
1195 }
1196
1197 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1198 {
1199         struct bq27xxx_device_info *di;
1200         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1201
1202         if (!pdata) {
1203                 dev_err(&pdev->dev, "no platform_data supplied\n");
1204                 return -EINVAL;
1205         }
1206
1207         if (!pdata->read) {
1208                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1209                 return -EINVAL;
1210         }
1211
1212         if (!pdata->chip) {
1213                 dev_err(&pdev->dev, "no device supplied\n");
1214                 return -EINVAL;
1215         }
1216
1217         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1218         if (!di)
1219                 return -ENOMEM;
1220
1221         platform_set_drvdata(pdev, di);
1222
1223         di->dev = &pdev->dev;
1224         di->chip = pdata->chip;
1225         di->name = pdata->name ?: dev_name(&pdev->dev);
1226         di->bus.read = bq27xxx_battery_platform_read;
1227
1228         return bq27xxx_battery_setup(di);
1229 }
1230
1231 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1232 {
1233         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1234
1235         bq27xxx_battery_teardown(di);
1236
1237         return 0;
1238 }
1239
1240 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1241         { "bq27000-battery", },
1242         { /* sentinel */ }
1243 };
1244 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1245
1246 #ifdef CONFIG_OF
1247 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1248         { .compatible = "ti,bq27000" },
1249         {},
1250 };
1251 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1252 #endif
1253
1254 static struct platform_driver bq27xxx_battery_platform_driver = {
1255         .probe  = bq27xxx_battery_platform_probe,
1256         .remove = bq27xxx_battery_platform_remove,
1257         .driver = {
1258                 .name = "bq27000-battery",
1259                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1260         },
1261         .id_table = bq27xxx_battery_platform_id_table,
1262 };
1263 module_platform_driver(bq27xxx_battery_platform_driver);
1264
1265 MODULE_ALIAS("platform:bq27000-battery");
1266
1267 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1268 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1269 MODULE_LICENSE("GPL");