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-g3
  26  * http://www.ti.com/product/bq27520-g4
  27  * http://www.ti.com/product/bq27530-g1
  28  * http://www.ti.com/product/bq27531-g1
  29  * http://www.ti.com/product/bq27541-g1
  30  * http://www.ti.com/product/bq27542-g1
  31  * http://www.ti.com/product/bq27546-g1
  32  * http://www.ti.com/product/bq27742-g1
  33  * http://www.ti.com/product/bq27545-g1
  34  * http://www.ti.com/product/bq27421-g1
  35  * http://www.ti.com/product/bq27425-g1
  36  * http://www.ti.com/product/bq27411-g1
  37  * http://www.ti.com/product/bq27621-g1
  38  */
  39
  40 #include <linux/device.h>
  41 #include <linux/module.h>
  42 #include <linux/mutex.h>
  43 #include <linux/param.h>
  44 #include <linux/jiffies.h>
  45 #include <linux/workqueue.h>
  46 #include <linux/delay.h>
  47 #include <linux/platform_device.h>
  48 #include <linux/power_supply.h>
  49 #include <linux/slab.h>
  50 #include <linux/of.h>
  51
  52 #include <linux/power/bq27xxx_battery.h>
  53
  54 #define DRIVER_VERSION          "1.2.0"
  55
  56 #define BQ27XXX_MANUFACTURER    "Texas Instruments"
  57
  58 /* BQ27XXX Flags */
  59 #define BQ27XXX_FLAG_DSC        BIT(0)
  60 #define BQ27XXX_FLAG_SOCF       BIT(1) /* State-of-Charge threshold final */
  61 #define BQ27XXX_FLAG_SOC1       BIT(2) /* State-of-Charge threshold 1 */
  62 #define BQ27XXX_FLAG_FC         BIT(9)
  63 #define BQ27XXX_FLAG_OTD        BIT(14)
  64 #define BQ27XXX_FLAG_OTC        BIT(15)
  65 #define BQ27XXX_FLAG_UT         BIT(14)
  66 #define BQ27XXX_FLAG_OT         BIT(15)
  67
  68 /* BQ27000 has different layout for Flags register */
  69 #define BQ27000_FLAG_EDVF       BIT(0) /* Final End-of-Discharge-Voltage flag */
  70 #define BQ27000_FLAG_EDV1       BIT(1) /* First End-of-Discharge-Voltage flag */
  71 #define BQ27000_FLAG_CI         BIT(4) /* Capacity Inaccurate flag */
  72 #define BQ27000_FLAG_FC         BIT(5)
  73 #define BQ27000_FLAG_CHGS       BIT(7) /* Charge state flag */
  74
  75 #define BQ27XXX_RS                      (20) /* Resistor sense mOhm */
  76 #define BQ27XXX_POWER_CONSTANT          (29200) /* 29.2 µV^2 * 1000 */
  77 #define BQ27XXX_CURRENT_CONSTANT        (3570) /* 3.57 µV * 1000 */
  78
  79 #define INVALID_REG_ADDR        0xff
  80
  81 /*
  82  * bq27xxx_reg_index - Register names
  83  *
  84  * These are indexes into a device's register mapping array.
  85  */
  86
  87 enum bq27xxx_reg_index {
  88         BQ27XXX_REG_CTRL = 0,   /* Control */
  89         BQ27XXX_REG_TEMP,       /* Temperature */
  90         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
  91         BQ27XXX_REG_VOLT,       /* Voltage */
  92         BQ27XXX_REG_AI,         /* Average Current */
  93         BQ27XXX_REG_FLAGS,      /* Flags */
  94         BQ27XXX_REG_TTE,        /* Time-to-Empty */
  95         BQ27XXX_REG_TTF,        /* Time-to-Full */
  96         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
  97         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
  98         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
  99         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
 100         BQ27XXX_REG_CYCT,       /* Cycle Count */
 101         BQ27XXX_REG_AE,         /* Available Energy */
 102         BQ27XXX_REG_SOC,        /* State-of-Charge */
 103         BQ27XXX_REG_DCAP,       /* Design Capacity */
 104         BQ27XXX_REG_AP,         /* Average Power */
 105         BQ27XXX_REG_MAX,        /* sentinel */
 106 };
 107
 108 /* Register mappings */
 109 static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 110         [BQ27000] = {
 111                 [BQ27XXX_REG_CTRL] = 0x00,
 112                 [BQ27XXX_REG_TEMP] = 0x06,
 113                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 114                 [BQ27XXX_REG_VOLT] = 0x08,
 115                 [BQ27XXX_REG_AI] = 0x14,
 116                 [BQ27XXX_REG_FLAGS] = 0x0a,
 117                 [BQ27XXX_REG_TTE] = 0x16,
 118                 [BQ27XXX_REG_TTF] = 0x18,
 119                 [BQ27XXX_REG_TTES] = 0x1c,
 120                 [BQ27XXX_REG_TTECP] = 0x26,
 121                 [BQ27XXX_REG_NAC] = 0x0c,
 122                 [BQ27XXX_REG_FCC] = 0x12,
 123                 [BQ27XXX_REG_CYCT] = 0x2a,
 124                 [BQ27XXX_REG_AE] = 0x22,
 125                 [BQ27XXX_REG_SOC] = 0x0b,
 126                 [BQ27XXX_REG_DCAP] = 0x76,
 127                 [BQ27XXX_REG_AP] = 0x24,
 128         },
 129         [BQ27010] = {
 130                 [BQ27XXX_REG_CTRL] = 0x00,
 131                 [BQ27XXX_REG_TEMP] = 0x06,
 132                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 133                 [BQ27XXX_REG_VOLT] = 0x08,
 134                 [BQ27XXX_REG_AI] = 0x14,
 135                 [BQ27XXX_REG_FLAGS] = 0x0a,
 136                 [BQ27XXX_REG_TTE] = 0x16,
 137                 [BQ27XXX_REG_TTF] = 0x18,
 138                 [BQ27XXX_REG_TTES] = 0x1c,
 139                 [BQ27XXX_REG_TTECP] = 0x26,
 140                 [BQ27XXX_REG_NAC] = 0x0c,
 141                 [BQ27XXX_REG_FCC] = 0x12,
 142                 [BQ27XXX_REG_CYCT] = 0x2a,
 143                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 144                 [BQ27XXX_REG_SOC] = 0x0b,
 145                 [BQ27XXX_REG_DCAP] = 0x76,
 146                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 147         },
 148         [BQ2750X] = {
 149                 [BQ27XXX_REG_CTRL] = 0x00,
 150                 [BQ27XXX_REG_TEMP] = 0x06,
 151                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 152                 [BQ27XXX_REG_VOLT] = 0x08,
 153                 [BQ27XXX_REG_AI] = 0x14,
 154                 [BQ27XXX_REG_FLAGS] = 0x0a,
 155                 [BQ27XXX_REG_TTE] = 0x16,
 156                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 157                 [BQ27XXX_REG_TTES] = 0x1a,
 158                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 159                 [BQ27XXX_REG_NAC] = 0x0c,
 160                 [BQ27XXX_REG_FCC] = 0x12,
 161                 [BQ27XXX_REG_CYCT] = 0x2a,
 162                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 163                 [BQ27XXX_REG_SOC] = 0x2c,
 164                 [BQ27XXX_REG_DCAP] = 0x3c,
 165                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 166         },
 167         [BQ2751X] = {
 168                 [BQ27XXX_REG_CTRL] = 0x00,
 169                 [BQ27XXX_REG_TEMP] = 0x06,
 170                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 171                 [BQ27XXX_REG_VOLT] = 0x08,
 172                 [BQ27XXX_REG_AI] = 0x14,
 173                 [BQ27XXX_REG_FLAGS] = 0x0a,
 174                 [BQ27XXX_REG_TTE] = 0x16,
 175                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 176                 [BQ27XXX_REG_TTES] = 0x1a,
 177                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 178                 [BQ27XXX_REG_NAC] = 0x0c,
 179                 [BQ27XXX_REG_FCC] = 0x12,
 180                 [BQ27XXX_REG_CYCT] = 0x1e,
 181                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 182                 [BQ27XXX_REG_SOC] = 0x20,
 183                 [BQ27XXX_REG_DCAP] = 0x2e,
 184                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 185         },
 186         [BQ27500] = {
 187                 [BQ27XXX_REG_CTRL] = 0x00,
 188                 [BQ27XXX_REG_TEMP] = 0x06,
 189                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 190                 [BQ27XXX_REG_VOLT] = 0x08,
 191                 [BQ27XXX_REG_AI] = 0x14,
 192                 [BQ27XXX_REG_FLAGS] = 0x0a,
 193                 [BQ27XXX_REG_TTE] = 0x16,
 194                 [BQ27XXX_REG_TTF] = 0x18,
 195                 [BQ27XXX_REG_TTES] = 0x1c,
 196                 [BQ27XXX_REG_TTECP] = 0x26,
 197                 [BQ27XXX_REG_NAC] = 0x0c,
 198                 [BQ27XXX_REG_FCC] = 0x12,
 199                 [BQ27XXX_REG_CYCT] = 0x2a,
 200                 [BQ27XXX_REG_AE] = 0x22,
 201                 [BQ27XXX_REG_SOC] = 0x2c,
 202                 [BQ27XXX_REG_DCAP] = 0x3c,
 203                 [BQ27XXX_REG_AP] = 0x24,
 204         },
 205         [BQ27530] = {
 206                 [BQ27XXX_REG_CTRL] = 0x00,
 207                 [BQ27XXX_REG_TEMP] = 0x06,
 208                 [BQ27XXX_REG_INT_TEMP] = 0x32,
 209                 [BQ27XXX_REG_VOLT] = 0x08,
 210                 [BQ27XXX_REG_AI] = 0x14,
 211                 [BQ27XXX_REG_FLAGS] = 0x0a,
 212                 [BQ27XXX_REG_TTE] = 0x16,
 213                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 214                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 215                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 216                 [BQ27XXX_REG_NAC] = 0x0c,
 217                 [BQ27XXX_REG_FCC] = 0x12,
 218                 [BQ27XXX_REG_CYCT] = 0x2a,
 219                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 220                 [BQ27XXX_REG_SOC] = 0x2c,
 221                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 222                 [BQ27XXX_REG_AP] = 0x24,
 223         },
 224         [BQ27541] = {
 225                 [BQ27XXX_REG_CTRL] = 0x00,
 226                 [BQ27XXX_REG_TEMP] = 0x06,
 227                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 228                 [BQ27XXX_REG_VOLT] = 0x08,
 229                 [BQ27XXX_REG_AI] = 0x14,
 230                 [BQ27XXX_REG_FLAGS] = 0x0a,
 231                 [BQ27XXX_REG_TTE] = 0x16,
 232                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 233                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 234                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 235                 [BQ27XXX_REG_NAC] = 0x0c,
 236                 [BQ27XXX_REG_FCC] = 0x12,
 237                 [BQ27XXX_REG_CYCT] = 0x2a,
 238                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 239                 [BQ27XXX_REG_SOC] = 0x2c,
 240                 [BQ27XXX_REG_DCAP] = 0x3c,
 241                 [BQ27XXX_REG_AP] = 0x24,
 242         },
 243         [BQ27545] = {
 244                 [BQ27XXX_REG_CTRL] = 0x00,
 245                 [BQ27XXX_REG_TEMP] = 0x06,
 246                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 247                 [BQ27XXX_REG_VOLT] = 0x08,
 248                 [BQ27XXX_REG_AI] = 0x14,
 249                 [BQ27XXX_REG_FLAGS] = 0x0a,
 250                 [BQ27XXX_REG_TTE] = 0x16,
 251                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 252                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 253                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 254                 [BQ27XXX_REG_NAC] = 0x0c,
 255                 [BQ27XXX_REG_FCC] = 0x12,
 256                 [BQ27XXX_REG_CYCT] = 0x2a,
 257                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 258                 [BQ27XXX_REG_SOC] = 0x2c,
 259                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 260                 [BQ27XXX_REG_AP] = 0x24,
 261         },
 262         [BQ27421] = {
 263                 [BQ27XXX_REG_CTRL] = 0x00,
 264                 [BQ27XXX_REG_TEMP] = 0x02,
 265                 [BQ27XXX_REG_INT_TEMP] = 0x1e,
 266                 [BQ27XXX_REG_VOLT] = 0x04,
 267                 [BQ27XXX_REG_AI] = 0x10,
 268                 [BQ27XXX_REG_FLAGS] = 0x06,
 269                 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
 270                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 271                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 272                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 273                 [BQ27XXX_REG_NAC] = 0x08,
 274                 [BQ27XXX_REG_FCC] = 0x0e,
 275                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 276                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 277                 [BQ27XXX_REG_SOC] = 0x1c,
 278                 [BQ27XXX_REG_DCAP] = 0x3c,
 279                 [BQ27XXX_REG_AP] = 0x18,
 280         },
 281 };
 282
 283 static enum power_supply_property bq27000_battery_props[] = {
 284         POWER_SUPPLY_PROP_STATUS,
 285         POWER_SUPPLY_PROP_PRESENT,
 286         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 287         POWER_SUPPLY_PROP_CURRENT_NOW,
 288         POWER_SUPPLY_PROP_CAPACITY,
 289         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 290         POWER_SUPPLY_PROP_TEMP,
 291         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 292         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 293         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 294         POWER_SUPPLY_PROP_TECHNOLOGY,
 295         POWER_SUPPLY_PROP_CHARGE_FULL,
 296         POWER_SUPPLY_PROP_CHARGE_NOW,
 297         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 298         POWER_SUPPLY_PROP_CYCLE_COUNT,
 299         POWER_SUPPLY_PROP_ENERGY_NOW,
 300         POWER_SUPPLY_PROP_POWER_AVG,
 301         POWER_SUPPLY_PROP_HEALTH,
 302         POWER_SUPPLY_PROP_MANUFACTURER,
 303 };
 304
 305 static enum power_supply_property bq27010_battery_props[] = {
 306         POWER_SUPPLY_PROP_STATUS,
 307         POWER_SUPPLY_PROP_PRESENT,
 308         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 309         POWER_SUPPLY_PROP_CURRENT_NOW,
 310         POWER_SUPPLY_PROP_CAPACITY,
 311         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 312         POWER_SUPPLY_PROP_TEMP,
 313         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 314         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 315         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 316         POWER_SUPPLY_PROP_TECHNOLOGY,
 317         POWER_SUPPLY_PROP_CHARGE_FULL,
 318         POWER_SUPPLY_PROP_CHARGE_NOW,
 319         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 320         POWER_SUPPLY_PROP_CYCLE_COUNT,
 321         POWER_SUPPLY_PROP_HEALTH,
 322         POWER_SUPPLY_PROP_MANUFACTURER,
 323 };
 324
 325 static enum power_supply_property bq2750x_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_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_HEALTH,
 340         POWER_SUPPLY_PROP_MANUFACTURER,
 341 };
 342
 343 static enum power_supply_property bq2751x_battery_props[] = {
 344         POWER_SUPPLY_PROP_STATUS,
 345         POWER_SUPPLY_PROP_PRESENT,
 346         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 347         POWER_SUPPLY_PROP_CURRENT_NOW,
 348         POWER_SUPPLY_PROP_CAPACITY,
 349         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 350         POWER_SUPPLY_PROP_TEMP,
 351         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 352         POWER_SUPPLY_PROP_TECHNOLOGY,
 353         POWER_SUPPLY_PROP_CHARGE_FULL,
 354         POWER_SUPPLY_PROP_CHARGE_NOW,
 355         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 356         POWER_SUPPLY_PROP_CYCLE_COUNT,
 357         POWER_SUPPLY_PROP_HEALTH,
 358         POWER_SUPPLY_PROP_MANUFACTURER,
 359 };
 360
 361 static enum power_supply_property bq27500_battery_props[] = {
 362         POWER_SUPPLY_PROP_STATUS,
 363         POWER_SUPPLY_PROP_PRESENT,
 364         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 365         POWER_SUPPLY_PROP_CURRENT_NOW,
 366         POWER_SUPPLY_PROP_CAPACITY,
 367         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 368         POWER_SUPPLY_PROP_TEMP,
 369         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 370         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 371         POWER_SUPPLY_PROP_TECHNOLOGY,
 372         POWER_SUPPLY_PROP_CHARGE_FULL,
 373         POWER_SUPPLY_PROP_CHARGE_NOW,
 374         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 375         POWER_SUPPLY_PROP_CYCLE_COUNT,
 376         POWER_SUPPLY_PROP_ENERGY_NOW,
 377         POWER_SUPPLY_PROP_POWER_AVG,
 378         POWER_SUPPLY_PROP_HEALTH,
 379         POWER_SUPPLY_PROP_MANUFACTURER,
 380 };
 381
 382 static enum power_supply_property bq27530_battery_props[] = {
 383         POWER_SUPPLY_PROP_STATUS,
 384         POWER_SUPPLY_PROP_PRESENT,
 385         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 386         POWER_SUPPLY_PROP_CURRENT_NOW,
 387         POWER_SUPPLY_PROP_CAPACITY,
 388         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 389         POWER_SUPPLY_PROP_TEMP,
 390         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 391         POWER_SUPPLY_PROP_TECHNOLOGY,
 392         POWER_SUPPLY_PROP_CHARGE_FULL,
 393         POWER_SUPPLY_PROP_CHARGE_NOW,
 394         POWER_SUPPLY_PROP_POWER_AVG,
 395         POWER_SUPPLY_PROP_HEALTH,
 396         POWER_SUPPLY_PROP_CYCLE_COUNT,
 397         POWER_SUPPLY_PROP_MANUFACTURER,
 398 };
 399
 400 static enum power_supply_property bq27541_battery_props[] = {
 401         POWER_SUPPLY_PROP_STATUS,
 402         POWER_SUPPLY_PROP_PRESENT,
 403         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 404         POWER_SUPPLY_PROP_CURRENT_NOW,
 405         POWER_SUPPLY_PROP_CAPACITY,
 406         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 407         POWER_SUPPLY_PROP_TEMP,
 408         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 409         POWER_SUPPLY_PROP_TECHNOLOGY,
 410         POWER_SUPPLY_PROP_CHARGE_FULL,
 411         POWER_SUPPLY_PROP_CHARGE_NOW,
 412         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 413         POWER_SUPPLY_PROP_CYCLE_COUNT,
 414         POWER_SUPPLY_PROP_POWER_AVG,
 415         POWER_SUPPLY_PROP_HEALTH,
 416         POWER_SUPPLY_PROP_MANUFACTURER,
 417 };
 418
 419 static enum power_supply_property bq27545_battery_props[] = {
 420         POWER_SUPPLY_PROP_STATUS,
 421         POWER_SUPPLY_PROP_PRESENT,
 422         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 423         POWER_SUPPLY_PROP_CURRENT_NOW,
 424         POWER_SUPPLY_PROP_CAPACITY,
 425         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 426         POWER_SUPPLY_PROP_TEMP,
 427         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 428         POWER_SUPPLY_PROP_TECHNOLOGY,
 429         POWER_SUPPLY_PROP_CHARGE_FULL,
 430         POWER_SUPPLY_PROP_CHARGE_NOW,
 431         POWER_SUPPLY_PROP_HEALTH,
 432         POWER_SUPPLY_PROP_CYCLE_COUNT,
 433         POWER_SUPPLY_PROP_POWER_AVG,
 434         POWER_SUPPLY_PROP_MANUFACTURER,
 435 };
 436
 437 static enum power_supply_property bq27421_battery_props[] = {
 438         POWER_SUPPLY_PROP_STATUS,
 439         POWER_SUPPLY_PROP_PRESENT,
 440         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 441         POWER_SUPPLY_PROP_CURRENT_NOW,
 442         POWER_SUPPLY_PROP_CAPACITY,
 443         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 444         POWER_SUPPLY_PROP_TEMP,
 445         POWER_SUPPLY_PROP_TECHNOLOGY,
 446         POWER_SUPPLY_PROP_CHARGE_FULL,
 447         POWER_SUPPLY_PROP_CHARGE_NOW,
 448         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 449         POWER_SUPPLY_PROP_MANUFACTURER,
 450 };
 451
 452 #define BQ27XXX_PROP(_id, _prop)                \
 453         [_id] = {                               \
 454                 .props = _prop,                 \
 455                 .size = ARRAY_SIZE(_prop),      \
 456         }
 457
 458 static struct {
 459         enum power_supply_property *props;
 460         size_t size;
 461 } bq27xxx_battery_props[] = {
 462         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
 463         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
 464         BQ27XXX_PROP(BQ2750X, bq2750x_battery_props),
 465         BQ27XXX_PROP(BQ2751X, bq2751x_battery_props),
 466         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
 467         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
 468         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
 469         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
 470         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
 471 };
 472
 473 static DEFINE_MUTEX(bq27xxx_list_lock);
 474 static LIST_HEAD(bq27xxx_battery_devices);
 475
 476 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
 477 {
 478         struct bq27xxx_device_info *di;
 479         unsigned int prev_val = *(unsigned int *) kp->arg;
 480         int ret;
 481
 482         ret = param_set_uint(val, kp);
 483         if (ret < 0 || prev_val == *(unsigned int *) kp->arg)
 484                 return ret;
 485
 486         mutex_lock(&bq27xxx_list_lock);
 487         list_for_each_entry(di, &bq27xxx_battery_devices, list) {
 488                 cancel_delayed_work_sync(&di->work);
 489                 schedule_delayed_work(&di->work, 0);
 490         }
 491         mutex_unlock(&bq27xxx_list_lock);
 492
 493         return ret;
 494 }
 495
 496 static const struct kernel_param_ops param_ops_poll_interval = {
 497         .get = param_get_uint,
 498         .set = poll_interval_param_set,
 499 };
 500
 501 static unsigned int poll_interval = 360;
 502 module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
 503 MODULE_PARM_DESC(poll_interval,
 504                  "battery poll interval in seconds - 0 disables polling");
 505
 506 /*
 507  * Common code for BQ27xxx devices
 508  */
 509
 510 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 511                                bool single)
 512 {
 513         /* Reports EINVAL for invalid/missing registers */
 514         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 515                 return -EINVAL;
 516
 517         return di->bus.read(di, di->regs[reg_index], single);
 518 }
 519
 520 /*
 521  * Return the battery State-of-Charge
 522  * Or < 0 if something fails.
 523  */
 524 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 525 {
 526         int soc;
 527
 528         if (di->chip == BQ27000 || di->chip == BQ27010)
 529                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
 530         else
 531                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 532
 533         if (soc < 0)
 534                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 535
 536         return soc;
 537 }
 538
 539 /*
 540  * Return a battery charge value in µAh
 541  * Or < 0 if something fails.
 542  */
 543 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 544 {
 545         int charge;
 546
 547         charge = bq27xxx_read(di, reg, false);
 548         if (charge < 0) {
 549                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 550                         reg, charge);
 551                 return charge;
 552         }
 553
 554         if (di->chip == BQ27000 || di->chip == BQ27010)
 555                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 556         else
 557                 charge *= 1000;
 558
 559         return charge;
 560 }
 561
 562 /*
 563  * Return the battery Nominal available capacity in µAh
 564  * Or < 0 if something fails.
 565  */
 566 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 567 {
 568         int flags;
 569
 570         if (di->chip == BQ27000 || di->chip == BQ27010) {
 571                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 572                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 573                         return -ENODATA;
 574         }
 575
 576         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 577 }
 578
 579 /*
 580  * Return the battery Full Charge Capacity in µAh
 581  * Or < 0 if something fails.
 582  */
 583 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 584 {
 585         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 586 }
 587
 588 /*
 589  * Return the Design Capacity in µAh
 590  * Or < 0 if something fails.
 591  */
 592 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 593 {
 594         int dcap;
 595
 596         if (di->chip == BQ27000 || di->chip == BQ27010)
 597                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
 598         else
 599                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 600
 601         if (dcap < 0) {
 602                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 603                 return dcap;
 604         }
 605
 606         if (di->chip == BQ27000 || di->chip == BQ27010)
 607                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 608         else
 609                 dcap *= 1000;
 610
 611         return dcap;
 612 }
 613
 614 /*
 615  * Return the battery Available energy in µWh
 616  * Or < 0 if something fails.
 617  */
 618 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 619 {
 620         int ae;
 621
 622         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 623         if (ae < 0) {
 624                 dev_dbg(di->dev, "error reading available energy\n");
 625                 return ae;
 626         }
 627
 628         if (di->chip == BQ27000 || di->chip == BQ27010)
 629                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 630         else
 631                 ae *= 1000;
 632
 633         return ae;
 634 }
 635
 636 /*
 637  * Return the battery temperature in tenths of degree Kelvin
 638  * Or < 0 if something fails.
 639  */
 640 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 641 {
 642         int temp;
 643
 644         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 645         if (temp < 0) {
 646                 dev_err(di->dev, "error reading temperature\n");
 647                 return temp;
 648         }
 649
 650         if (di->chip == BQ27000 || di->chip == BQ27010)
 651                 temp = 5 * temp / 2;
 652
 653         return temp;
 654 }
 655
 656 /*
 657  * Return the battery Cycle count total
 658  * Or < 0 if something fails.
 659  */
 660 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 661 {
 662         int cyct;
 663
 664         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 665         if (cyct < 0)
 666                 dev_err(di->dev, "error reading cycle count total\n");
 667
 668         return cyct;
 669 }
 670
 671 /*
 672  * Read a time register.
 673  * Return < 0 if something fails.
 674  */
 675 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 676 {
 677         int tval;
 678
 679         tval = bq27xxx_read(di, reg, false);
 680         if (tval < 0) {
 681                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 682                         reg, tval);
 683                 return tval;
 684         }
 685
 686         if (tval == 65535)
 687                 return -ENODATA;
 688
 689         return tval * 60;
 690 }
 691
 692 /*
 693  * Read an average power register.
 694  * Return < 0 if something fails.
 695  */
 696 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 697 {
 698         int tval;
 699
 700         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 701         if (tval < 0) {
 702                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 703                         BQ27XXX_REG_AP, tval);
 704                 return tval;
 705         }
 706
 707         if (di->chip == BQ27000 || di->chip == BQ27010)
 708                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 709         else
 710                 return tval;
 711 }
 712
 713 /*
 714  * Returns true if a battery over temperature condition is detected
 715  */
 716 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
 717 {
 718         switch (di->chip) {
 719         case BQ2750X:
 720         case BQ2751X:
 721         case BQ27500:
 722         case BQ27541:
 723         case BQ27545:
 724                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 725         case BQ27530:
 726         case BQ27421:
 727                 return flags & BQ27XXX_FLAG_OT;
 728         default:
 729                 return false;
 730         }
 731 }
 732
 733 /*
 734  * Returns true if a battery under temperature condition is detected
 735  */
 736 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
 737 {
 738         if (di->chip == BQ27530 || di->chip == BQ27421)
 739                 return flags & BQ27XXX_FLAG_UT;
 740
 741         return false;
 742 }
 743
 744 /*
 745  * Returns true if a low state of charge condition is detected
 746  */
 747 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
 748 {
 749         if (di->chip == BQ27000 || di->chip == BQ27010)
 750                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
 751         else
 752                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
 753 }
 754
 755 /*
 756  * Read flag register.
 757  * Return < 0 if something fails.
 758  */
 759 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
 760 {
 761         int flags;
 762         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 763
 764         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 765         if (flags < 0) {
 766                 dev_err(di->dev, "error reading flag register:%d\n", flags);
 767                 return flags;
 768         }
 769
 770         /* Unlikely but important to return first */
 771         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
 772                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 773         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
 774                 return POWER_SUPPLY_HEALTH_COLD;
 775         if (unlikely(bq27xxx_battery_dead(di, flags)))
 776                 return POWER_SUPPLY_HEALTH_DEAD;
 777
 778         return POWER_SUPPLY_HEALTH_GOOD;
 779 }
 780
 781 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
 782 {
 783         struct bq27xxx_reg_cache cache = {0, };
 784         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
 785         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 786
 787         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 788         if ((cache.flags & 0xff) == 0xff)
 789                 cache.flags = -1; /* read error */
 790         if (cache.flags >= 0) {
 791                 cache.temperature = bq27xxx_battery_read_temperature(di);
 792                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
 793                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
 794                         cache.capacity = -ENODATA;
 795                         cache.energy = -ENODATA;
 796                         cache.time_to_empty = -ENODATA;
 797                         cache.time_to_empty_avg = -ENODATA;
 798                         cache.time_to_full = -ENODATA;
 799                         cache.charge_full = -ENODATA;
 800                         cache.health = -ENODATA;
 801                 } else {
 802                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
 803                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
 804                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
 805                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
 806                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
 807                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
 808                         cache.charge_full = bq27xxx_battery_read_fcc(di);
 809                         cache.capacity = bq27xxx_battery_read_soc(di);
 810                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
 811                                 cache.energy = bq27xxx_battery_read_energy(di);
 812                         cache.health = bq27xxx_battery_read_health(di);
 813                 }
 814                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
 815                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
 816                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
 817                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
 818
 819                 /* We only have to read charge design full once */
 820                 if (di->charge_design_full <= 0)
 821                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
 822         }
 823
 824         if (di->cache.capacity != cache.capacity)
 825                 power_supply_changed(di->bat);
 826
 827         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 828                 di->cache = cache;
 829
 830         di->last_update = jiffies;
 831 }
 832 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
 833
 834 static void bq27xxx_battery_poll(struct work_struct *work)
 835 {
 836         struct bq27xxx_device_info *di =
 837                         container_of(work, struct bq27xxx_device_info,
 838                                      work.work);
 839
 840         bq27xxx_battery_update(di);
 841
 842         if (poll_interval > 0)
 843                 schedule_delayed_work(&di->work, poll_interval * HZ);
 844 }
 845
 846 /*
 847  * Return the battery average current in µA
 848  * Note that current can be negative signed as well
 849  * Or 0 if something fails.
 850  */
 851 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
 852                                    union power_supply_propval *val)
 853 {
 854         int curr;
 855         int flags;
 856
 857         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
 858         if (curr < 0) {
 859                 dev_err(di->dev, "error reading current\n");
 860                 return curr;
 861         }
 862
 863         if (di->chip == BQ27000 || di->chip == BQ27010) {
 864                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 865                 if (flags & BQ27000_FLAG_CHGS) {
 866                         dev_dbg(di->dev, "negative current!\n");
 867                         curr = -curr;
 868                 }
 869
 870                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 871         } else {
 872                 /* Other gauges return signed value */
 873                 val->intval = (int)((s16)curr) * 1000;
 874         }
 875
 876         return 0;
 877 }
 878
 879 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
 880                                   union power_supply_propval *val)
 881 {
 882         int status;
 883
 884         if (di->chip == BQ27000 || di->chip == BQ27010) {
 885                 if (di->cache.flags & BQ27000_FLAG_FC)
 886                         status = POWER_SUPPLY_STATUS_FULL;
 887                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 888                         status = POWER_SUPPLY_STATUS_CHARGING;
 889                 else if (power_supply_am_i_supplied(di->bat))
 890                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 891                 else
 892                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 893         } else {
 894                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 895                         status = POWER_SUPPLY_STATUS_FULL;
 896                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
 897                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 898                 else
 899                         status = POWER_SUPPLY_STATUS_CHARGING;
 900         }
 901
 902         val->intval = status;
 903
 904         return 0;
 905 }
 906
 907 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
 908                                           union power_supply_propval *val)
 909 {
 910         int level;
 911
 912         if (di->chip == BQ27000 || di->chip == BQ27010) {
 913                 if (di->cache.flags & BQ27000_FLAG_FC)
 914                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 915                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 916                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 917                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 918                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 919                 else
 920                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 921         } else {
 922                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 923                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 924                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
 925                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 926                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
 927                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 928                 else
 929                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 930         }
 931
 932         val->intval = level;
 933
 934         return 0;
 935 }
 936
 937 /*
 938  * Return the battery Voltage in millivolts
 939  * Or < 0 if something fails.
 940  */
 941 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
 942                                    union power_supply_propval *val)
 943 {
 944         int volt;
 945
 946         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
 947         if (volt < 0) {
 948                 dev_err(di->dev, "error reading voltage\n");
 949                 return volt;
 950         }
 951
 952         val->intval = volt * 1000;
 953
 954         return 0;
 955 }
 956
 957 static int bq27xxx_simple_value(int value,
 958                                 union power_supply_propval *val)
 959 {
 960         if (value < 0)
 961                 return value;
 962
 963         val->intval = value;
 964
 965         return 0;
 966 }
 967
 968 static int bq27xxx_battery_get_property(struct power_supply *psy,
 969                                         enum power_supply_property psp,
 970                                         union power_supply_propval *val)
 971 {
 972         int ret = 0;
 973         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
 974
 975         mutex_lock(&di->lock);
 976         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 977                 cancel_delayed_work_sync(&di->work);
 978                 bq27xxx_battery_poll(&di->work.work);
 979         }
 980         mutex_unlock(&di->lock);
 981
 982         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 983                 return -ENODEV;
 984
 985         switch (psp) {
 986         case POWER_SUPPLY_PROP_STATUS:
 987                 ret = bq27xxx_battery_status(di, val);
 988                 break;
 989         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 990                 ret = bq27xxx_battery_voltage(di, val);
 991                 break;
 992         case POWER_SUPPLY_PROP_PRESENT:
 993                 val->intval = di->cache.flags < 0 ? 0 : 1;
 994                 break;
 995         case POWER_SUPPLY_PROP_CURRENT_NOW:
 996                 ret = bq27xxx_battery_current(di, val);
 997                 break;
 998         case POWER_SUPPLY_PROP_CAPACITY:
 999                 ret = bq27xxx_simple_value(di->cache.capacity, val);
1000                 break;
1001         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1002                 ret = bq27xxx_battery_capacity_level(di, val);
1003                 break;
1004         case POWER_SUPPLY_PROP_TEMP:
1005                 ret = bq27xxx_simple_value(di->cache.temperature, val);
1006                 if (ret == 0)
1007                         val->intval -= 2731; /* convert decidegree k to c */
1008                 break;
1009         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
1010                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
1011                 break;
1012         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
1013                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
1014                 break;
1015         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
1016                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
1017                 break;
1018         case POWER_SUPPLY_PROP_TECHNOLOGY:
1019                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
1020                 break;
1021         case POWER_SUPPLY_PROP_CHARGE_NOW:
1022                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
1023                 break;
1024         case POWER_SUPPLY_PROP_CHARGE_FULL:
1025                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
1026                 break;
1027         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1028                 ret = bq27xxx_simple_value(di->charge_design_full, val);
1029                 break;
1030         case POWER_SUPPLY_PROP_CYCLE_COUNT:
1031                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
1032                 break;
1033         case POWER_SUPPLY_PROP_ENERGY_NOW:
1034                 ret = bq27xxx_simple_value(di->cache.energy, val);
1035                 break;
1036         case POWER_SUPPLY_PROP_POWER_AVG:
1037                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
1038                 break;
1039         case POWER_SUPPLY_PROP_HEALTH:
1040                 ret = bq27xxx_simple_value(di->cache.health, val);
1041                 break;
1042         case POWER_SUPPLY_PROP_MANUFACTURER:
1043                 val->strval = BQ27XXX_MANUFACTURER;
1044                 break;
1045         default:
1046                 return -EINVAL;
1047         }
1048
1049         return ret;
1050 }
1051
1052 static void bq27xxx_external_power_changed(struct power_supply *psy)
1053 {
1054         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1055
1056         cancel_delayed_work_sync(&di->work);
1057         schedule_delayed_work(&di->work, 0);
1058 }
1059
1060 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1061 {
1062         struct power_supply_desc *psy_desc;
1063         struct power_supply_config psy_cfg = { .drv_data = di, };
1064
1065         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1066         mutex_init(&di->lock);
1067         di->regs = bq27xxx_regs[di->chip];
1068
1069         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1070         if (!psy_desc)
1071                 return -ENOMEM;
1072
1073         psy_desc->name = di->name;
1074         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1075         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
1076         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
1077         psy_desc->get_property = bq27xxx_battery_get_property;
1078         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1079
1080         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1081         if (IS_ERR(di->bat)) {
1082                 dev_err(di->dev, "failed to register battery\n");
1083                 return PTR_ERR(di->bat);
1084         }
1085
1086         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1087
1088         bq27xxx_battery_update(di);
1089
1090         mutex_lock(&bq27xxx_list_lock);
1091         list_add(&di->list, &bq27xxx_battery_devices);
1092         mutex_unlock(&bq27xxx_list_lock);
1093
1094         return 0;
1095 }
1096 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1097
1098 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1099 {
1100         /*
1101          * power_supply_unregister call bq27xxx_battery_get_property which
1102          * call bq27xxx_battery_poll.
1103          * Make sure that bq27xxx_battery_poll will not call
1104          * schedule_delayed_work again after unregister (which cause OOPS).
1105          */
1106         poll_interval = 0;
1107
1108         cancel_delayed_work_sync(&di->work);
1109
1110         power_supply_unregister(di->bat);
1111
1112         mutex_lock(&bq27xxx_list_lock);
1113         list_del(&di->list);
1114         mutex_unlock(&bq27xxx_list_lock);
1115
1116         mutex_destroy(&di->lock);
1117 }
1118 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1119
1120 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1121                                          bool single)
1122 {
1123         struct device *dev = di->dev;
1124         struct bq27xxx_platform_data *pdata = dev->platform_data;
1125         unsigned int timeout = 3;
1126         int upper, lower;
1127         int temp;
1128
1129         if (!single) {
1130                 /* Make sure the value has not changed in between reading the
1131                  * lower and the upper part */
1132                 upper = pdata->read(dev, reg + 1);
1133                 do {
1134                         temp = upper;
1135                         if (upper < 0)
1136                                 return upper;
1137
1138                         lower = pdata->read(dev, reg);
1139                         if (lower < 0)
1140                                 return lower;
1141
1142                         upper = pdata->read(dev, reg + 1);
1143                 } while (temp != upper && --timeout);
1144
1145                 if (timeout == 0)
1146                         return -EIO;
1147
1148                 return (upper << 8) | lower;
1149         }
1150
1151         return pdata->read(dev, reg);
1152 }
1153
1154 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1155 {
1156         struct bq27xxx_device_info *di;
1157         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1158
1159         if (!pdata) {
1160                 dev_err(&pdev->dev, "no platform_data supplied\n");
1161                 return -EINVAL;
1162         }
1163
1164         if (!pdata->read) {
1165                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1166                 return -EINVAL;
1167         }
1168
1169         if (!pdata->chip) {
1170                 dev_err(&pdev->dev, "no device supplied\n");
1171                 return -EINVAL;
1172         }
1173
1174         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1175         if (!di)
1176                 return -ENOMEM;
1177
1178         platform_set_drvdata(pdev, di);
1179
1180         di->dev = &pdev->dev;
1181         di->chip = pdata->chip;
1182         di->name = pdata->name ?: dev_name(&pdev->dev);
1183         di->bus.read = bq27xxx_battery_platform_read;
1184
1185         return bq27xxx_battery_setup(di);
1186 }
1187
1188 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1189 {
1190         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1191
1192         bq27xxx_battery_teardown(di);
1193
1194         return 0;
1195 }
1196
1197 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1198         { "bq27000-battery", },
1199         { /* sentinel */ }
1200 };
1201 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1202
1203 #ifdef CONFIG_OF
1204 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1205         { .compatible = "ti,bq27000" },
1206         {},
1207 };
1208 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1209 #endif
1210
1211 static struct platform_driver bq27xxx_battery_platform_driver = {
1212         .probe  = bq27xxx_battery_platform_probe,
1213         .remove = bq27xxx_battery_platform_remove,
1214         .driver = {
1215                 .name = "bq27000-battery",
1216                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1217         },
1218         .id_table = bq27xxx_battery_platform_id_table,
1219 };
1220 module_platform_driver(bq27xxx_battery_platform_driver);
1221
1222 MODULE_ALIAS("platform:bq27000-battery");
1223
1224 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1225 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1226 MODULE_LICENSE("GPL");