drivers/power/supply/bq27xxx_battery.c

   1 /*
   2  * BQ27xxx battery driver
   3  *
   4  * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
   5  * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
   6  * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
   7  * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
   8  *
   9  * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
  10  *
  11  * This package is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  17  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  18  *
  19  * Datasheets:
  20  * http://www.ti.com/product/bq27000
  21  * http://www.ti.com/product/bq27200
  22  * http://www.ti.com/product/bq27010
  23  * http://www.ti.com/product/bq27210
  24  * http://www.ti.com/product/bq27500
  25  * http://www.ti.com/product/bq27510-g1
  26  * http://www.ti.com/product/bq27510-g2
  27  * http://www.ti.com/product/bq27510-g3
  28  * http://www.ti.com/product/bq27520-g4
  29  * http://www.ti.com/product/bq27530-g1
  30  * http://www.ti.com/product/bq27531-g1
  31  * http://www.ti.com/product/bq27541-g1
  32  * http://www.ti.com/product/bq27542-g1
  33  * http://www.ti.com/product/bq27546-g1
  34  * http://www.ti.com/product/bq27742-g1
  35  * http://www.ti.com/product/bq27545-g1
  36  * http://www.ti.com/product/bq27421-g1
  37  * http://www.ti.com/product/bq27425-g1
  38  * http://www.ti.com/product/bq27411-g1
  39  * http://www.ti.com/product/bq27621-g1
  40  */
  41
  42 #include <linux/device.h>
  43 #include <linux/module.h>
  44 #include <linux/mutex.h>
  45 #include <linux/param.h>
  46 #include <linux/jiffies.h>
  47 #include <linux/workqueue.h>
  48 #include <linux/delay.h>
  49 #include <linux/platform_device.h>
  50 #include <linux/power_supply.h>
  51 #include <linux/slab.h>
  52 #include <linux/of.h>
  53
  54 #include <linux/power/bq27xxx_battery.h>
  55
  56 #define DRIVER_VERSION          "1.2.0"
  57
  58 #define BQ27XXX_MANUFACTURER    "Texas Instruments"
  59
  60 /* BQ27XXX Flags */
  61 #define BQ27XXX_FLAG_DSC        BIT(0)
  62 #define BQ27XXX_FLAG_SOCF       BIT(1) /* State-of-Charge threshold final */
  63 #define BQ27XXX_FLAG_SOC1       BIT(2) /* State-of-Charge threshold 1 */
  64 #define BQ27XXX_FLAG_FC         BIT(9)
  65 #define BQ27XXX_FLAG_OTD        BIT(14)
  66 #define BQ27XXX_FLAG_OTC        BIT(15)
  67 #define BQ27XXX_FLAG_UT         BIT(14)
  68 #define BQ27XXX_FLAG_OT         BIT(15)
  69
  70 /* BQ27000 has different layout for Flags register */
  71 #define BQ27000_FLAG_EDVF       BIT(0) /* Final End-of-Discharge-Voltage flag */
  72 #define BQ27000_FLAG_EDV1       BIT(1) /* First End-of-Discharge-Voltage flag */
  73 #define BQ27000_FLAG_CI         BIT(4) /* Capacity Inaccurate flag */
  74 #define BQ27000_FLAG_FC         BIT(5)
  75 #define BQ27000_FLAG_CHGS       BIT(7) /* Charge state flag */
  76
  77 #define BQ27XXX_RS                      (20) /* Resistor sense mOhm */
  78 #define BQ27XXX_POWER_CONSTANT          (29200) /* 29.2 µV^2 * 1000 */
  79 #define BQ27XXX_CURRENT_CONSTANT        (3570) /* 3.57 µV * 1000 */
  80
  81 #define INVALID_REG_ADDR        0xff
  82
  83 /*
  84  * bq27xxx_reg_index - Register names
  85  *
  86  * These are indexes into a device's register mapping array.
  87  */
  88
  89 enum bq27xxx_reg_index {
  90         BQ27XXX_REG_CTRL = 0,   /* Control */
  91         BQ27XXX_REG_TEMP,       /* Temperature */
  92         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
  93         BQ27XXX_REG_VOLT,       /* Voltage */
  94         BQ27XXX_REG_AI,         /* Average Current */
  95         BQ27XXX_REG_FLAGS,      /* Flags */
  96         BQ27XXX_REG_TTE,        /* Time-to-Empty */
  97         BQ27XXX_REG_TTF,        /* Time-to-Full */
  98         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
  99         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
 100         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
 101         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
 102         BQ27XXX_REG_CYCT,       /* Cycle Count */
 103         BQ27XXX_REG_AE,         /* Available Energy */
 104         BQ27XXX_REG_SOC,        /* State-of-Charge */
 105         BQ27XXX_REG_DCAP,       /* Design Capacity */
 106         BQ27XXX_REG_AP,         /* Average Power */
 107         BQ27XXX_REG_MAX,        /* sentinel */
 108 };
 109
 110 /* Register mappings */
 111 static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
 112         [BQ27000] = {
 113                 [BQ27XXX_REG_CTRL] = 0x00,
 114                 [BQ27XXX_REG_TEMP] = 0x06,
 115                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 116                 [BQ27XXX_REG_VOLT] = 0x08,
 117                 [BQ27XXX_REG_AI] = 0x14,
 118                 [BQ27XXX_REG_FLAGS] = 0x0a,
 119                 [BQ27XXX_REG_TTE] = 0x16,
 120                 [BQ27XXX_REG_TTF] = 0x18,
 121                 [BQ27XXX_REG_TTES] = 0x1c,
 122                 [BQ27XXX_REG_TTECP] = 0x26,
 123                 [BQ27XXX_REG_NAC] = 0x0c,
 124                 [BQ27XXX_REG_FCC] = 0x12,
 125                 [BQ27XXX_REG_CYCT] = 0x2a,
 126                 [BQ27XXX_REG_AE] = 0x22,
 127                 [BQ27XXX_REG_SOC] = 0x0b,
 128                 [BQ27XXX_REG_DCAP] = 0x76,
 129                 [BQ27XXX_REG_AP] = 0x24,
 130         },
 131         [BQ27010] = {
 132                 [BQ27XXX_REG_CTRL] = 0x00,
 133                 [BQ27XXX_REG_TEMP] = 0x06,
 134                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 135                 [BQ27XXX_REG_VOLT] = 0x08,
 136                 [BQ27XXX_REG_AI] = 0x14,
 137                 [BQ27XXX_REG_FLAGS] = 0x0a,
 138                 [BQ27XXX_REG_TTE] = 0x16,
 139                 [BQ27XXX_REG_TTF] = 0x18,
 140                 [BQ27XXX_REG_TTES] = 0x1c,
 141                 [BQ27XXX_REG_TTECP] = 0x26,
 142                 [BQ27XXX_REG_NAC] = 0x0c,
 143                 [BQ27XXX_REG_FCC] = 0x12,
 144                 [BQ27XXX_REG_CYCT] = 0x2a,
 145                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 146                 [BQ27XXX_REG_SOC] = 0x0b,
 147                 [BQ27XXX_REG_DCAP] = 0x76,
 148                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 149         },
 150         [BQ2750X] = {
 151                 [BQ27XXX_REG_CTRL] = 0x00,
 152                 [BQ27XXX_REG_TEMP] = 0x06,
 153                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 154                 [BQ27XXX_REG_VOLT] = 0x08,
 155                 [BQ27XXX_REG_AI] = 0x14,
 156                 [BQ27XXX_REG_FLAGS] = 0x0a,
 157                 [BQ27XXX_REG_TTE] = 0x16,
 158                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 159                 [BQ27XXX_REG_TTES] = 0x1a,
 160                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 161                 [BQ27XXX_REG_NAC] = 0x0c,
 162                 [BQ27XXX_REG_FCC] = 0x12,
 163                 [BQ27XXX_REG_CYCT] = 0x2a,
 164                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 165                 [BQ27XXX_REG_SOC] = 0x2c,
 166                 [BQ27XXX_REG_DCAP] = 0x3c,
 167                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 168         },
 169         [BQ2751X] = {
 170                 [BQ27XXX_REG_CTRL] = 0x00,
 171                 [BQ27XXX_REG_TEMP] = 0x06,
 172                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 173                 [BQ27XXX_REG_VOLT] = 0x08,
 174                 [BQ27XXX_REG_AI] = 0x14,
 175                 [BQ27XXX_REG_FLAGS] = 0x0a,
 176                 [BQ27XXX_REG_TTE] = 0x16,
 177                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 178                 [BQ27XXX_REG_TTES] = 0x1a,
 179                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 180                 [BQ27XXX_REG_NAC] = 0x0c,
 181                 [BQ27XXX_REG_FCC] = 0x12,
 182                 [BQ27XXX_REG_CYCT] = 0x1e,
 183                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 184                 [BQ27XXX_REG_SOC] = 0x20,
 185                 [BQ27XXX_REG_DCAP] = 0x2e,
 186                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 187         },
 188         [BQ27500] = {
 189                 [BQ27XXX_REG_CTRL] = 0x00,
 190                 [BQ27XXX_REG_TEMP] = 0x06,
 191                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 192                 [BQ27XXX_REG_VOLT] = 0x08,
 193                 [BQ27XXX_REG_AI] = 0x14,
 194                 [BQ27XXX_REG_FLAGS] = 0x0a,
 195                 [BQ27XXX_REG_TTE] = 0x16,
 196                 [BQ27XXX_REG_TTF] = 0x18,
 197                 [BQ27XXX_REG_TTES] = 0x1c,
 198                 [BQ27XXX_REG_TTECP] = 0x26,
 199                 [BQ27XXX_REG_NAC] = 0x0c,
 200                 [BQ27XXX_REG_FCC] = 0x12,
 201                 [BQ27XXX_REG_CYCT] = 0x2a,
 202                 [BQ27XXX_REG_AE] = 0x22,
 203                 [BQ27XXX_REG_SOC] = 0x2c,
 204                 [BQ27XXX_REG_DCAP] = 0x3c,
 205                 [BQ27XXX_REG_AP] = 0x24,
 206         },
 207         [BQ27510G1] = {
 208                 [BQ27XXX_REG_CTRL] = 0x00,
 209                 [BQ27XXX_REG_TEMP] = 0x06,
 210                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 211                 [BQ27XXX_REG_VOLT] = 0x08,
 212                 [BQ27XXX_REG_AI] = 0x14,
 213                 [BQ27XXX_REG_FLAGS] = 0x0a,
 214                 [BQ27XXX_REG_TTE] = 0x16,
 215                 [BQ27XXX_REG_TTF] = 0x18,
 216                 [BQ27XXX_REG_TTES] = 0x1c,
 217                 [BQ27XXX_REG_TTECP] = 0x26,
 218                 [BQ27XXX_REG_NAC] = 0x0c,
 219                 [BQ27XXX_REG_FCC] = 0x12,
 220                 [BQ27XXX_REG_CYCT] = 0x2a,
 221                 [BQ27XXX_REG_AE] = 0x22,
 222                 [BQ27XXX_REG_SOC] = 0x2c,
 223                 [BQ27XXX_REG_DCAP] = 0x3c,
 224                 [BQ27XXX_REG_AP] = 0x24,
 225         },
 226         [BQ27510G2] = {
 227                 [BQ27XXX_REG_CTRL] = 0x00,
 228                 [BQ27XXX_REG_TEMP] = 0x06,
 229                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 230                 [BQ27XXX_REG_VOLT] = 0x08,
 231                 [BQ27XXX_REG_AI] = 0x14,
 232                 [BQ27XXX_REG_FLAGS] = 0x0a,
 233                 [BQ27XXX_REG_TTE] = 0x16,
 234                 [BQ27XXX_REG_TTF] = 0x18,
 235                 [BQ27XXX_REG_TTES] = 0x1c,
 236                 [BQ27XXX_REG_TTECP] = 0x26,
 237                 [BQ27XXX_REG_NAC] = 0x0c,
 238                 [BQ27XXX_REG_FCC] = 0x12,
 239                 [BQ27XXX_REG_CYCT] = 0x2a,
 240                 [BQ27XXX_REG_AE] = 0x22,
 241                 [BQ27XXX_REG_SOC] = 0x2c,
 242                 [BQ27XXX_REG_DCAP] = 0x3c,
 243                 [BQ27XXX_REG_AP] = 0x24,
 244         },
 245         [BQ27510G3] = {
 246                 [BQ27XXX_REG_CTRL] = 0x00,
 247                 [BQ27XXX_REG_TEMP] = 0x06,
 248                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 249                 [BQ27XXX_REG_VOLT] = 0x08,
 250                 [BQ27XXX_REG_AI] = 0x14,
 251                 [BQ27XXX_REG_FLAGS] = 0x0a,
 252                 [BQ27XXX_REG_TTE] = 0x16,
 253                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 254                 [BQ27XXX_REG_TTES] = 0x1a,
 255                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 256                 [BQ27XXX_REG_NAC] = 0x0c,
 257                 [BQ27XXX_REG_FCC] = 0x12,
 258                 [BQ27XXX_REG_CYCT] = 0x1e,
 259                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 260                 [BQ27XXX_REG_SOC] = 0x20,
 261                 [BQ27XXX_REG_DCAP] = 0x2e,
 262                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 263         },
 264         [BQ27530] = {
 265                 [BQ27XXX_REG_CTRL] = 0x00,
 266                 [BQ27XXX_REG_TEMP] = 0x06,
 267                 [BQ27XXX_REG_INT_TEMP] = 0x32,
 268                 [BQ27XXX_REG_VOLT] = 0x08,
 269                 [BQ27XXX_REG_AI] = 0x14,
 270                 [BQ27XXX_REG_FLAGS] = 0x0a,
 271                 [BQ27XXX_REG_TTE] = 0x16,
 272                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 273                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 274                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 275                 [BQ27XXX_REG_NAC] = 0x0c,
 276                 [BQ27XXX_REG_FCC] = 0x12,
 277                 [BQ27XXX_REG_CYCT] = 0x2a,
 278                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 279                 [BQ27XXX_REG_SOC] = 0x2c,
 280                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 281                 [BQ27XXX_REG_AP] = 0x24,
 282         },
 283         [BQ27541] = {
 284                 [BQ27XXX_REG_CTRL] = 0x00,
 285                 [BQ27XXX_REG_TEMP] = 0x06,
 286                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 287                 [BQ27XXX_REG_VOLT] = 0x08,
 288                 [BQ27XXX_REG_AI] = 0x14,
 289                 [BQ27XXX_REG_FLAGS] = 0x0a,
 290                 [BQ27XXX_REG_TTE] = 0x16,
 291                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 292                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 293                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 294                 [BQ27XXX_REG_NAC] = 0x0c,
 295                 [BQ27XXX_REG_FCC] = 0x12,
 296                 [BQ27XXX_REG_CYCT] = 0x2a,
 297                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 298                 [BQ27XXX_REG_SOC] = 0x2c,
 299                 [BQ27XXX_REG_DCAP] = 0x3c,
 300                 [BQ27XXX_REG_AP] = 0x24,
 301         },
 302         [BQ27545] = {
 303                 [BQ27XXX_REG_CTRL] = 0x00,
 304                 [BQ27XXX_REG_TEMP] = 0x06,
 305                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 306                 [BQ27XXX_REG_VOLT] = 0x08,
 307                 [BQ27XXX_REG_AI] = 0x14,
 308                 [BQ27XXX_REG_FLAGS] = 0x0a,
 309                 [BQ27XXX_REG_TTE] = 0x16,
 310                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 311                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 312                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 313                 [BQ27XXX_REG_NAC] = 0x0c,
 314                 [BQ27XXX_REG_FCC] = 0x12,
 315                 [BQ27XXX_REG_CYCT] = 0x2a,
 316                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 317                 [BQ27XXX_REG_SOC] = 0x2c,
 318                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 319                 [BQ27XXX_REG_AP] = 0x24,
 320         },
 321         [BQ27421] = {
 322                 [BQ27XXX_REG_CTRL] = 0x00,
 323                 [BQ27XXX_REG_TEMP] = 0x02,
 324                 [BQ27XXX_REG_INT_TEMP] = 0x1e,
 325                 [BQ27XXX_REG_VOLT] = 0x04,
 326                 [BQ27XXX_REG_AI] = 0x10,
 327                 [BQ27XXX_REG_FLAGS] = 0x06,
 328                 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
 329                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 330                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 331                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 332                 [BQ27XXX_REG_NAC] = 0x08,
 333                 [BQ27XXX_REG_FCC] = 0x0e,
 334                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 335                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 336                 [BQ27XXX_REG_SOC] = 0x1c,
 337                 [BQ27XXX_REG_DCAP] = 0x3c,
 338                 [BQ27XXX_REG_AP] = 0x18,
 339         },
 340 };
 341
 342 static enum power_supply_property bq27000_battery_props[] = {
 343         POWER_SUPPLY_PROP_STATUS,
 344         POWER_SUPPLY_PROP_PRESENT,
 345         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 346         POWER_SUPPLY_PROP_CURRENT_NOW,
 347         POWER_SUPPLY_PROP_CAPACITY,
 348         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 349         POWER_SUPPLY_PROP_TEMP,
 350         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 351         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 352         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 353         POWER_SUPPLY_PROP_TECHNOLOGY,
 354         POWER_SUPPLY_PROP_CHARGE_FULL,
 355         POWER_SUPPLY_PROP_CHARGE_NOW,
 356         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 357         POWER_SUPPLY_PROP_CYCLE_COUNT,
 358         POWER_SUPPLY_PROP_ENERGY_NOW,
 359         POWER_SUPPLY_PROP_POWER_AVG,
 360         POWER_SUPPLY_PROP_HEALTH,
 361         POWER_SUPPLY_PROP_MANUFACTURER,
 362 };
 363
 364 static enum power_supply_property bq27010_battery_props[] = {
 365         POWER_SUPPLY_PROP_STATUS,
 366         POWER_SUPPLY_PROP_PRESENT,
 367         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 368         POWER_SUPPLY_PROP_CURRENT_NOW,
 369         POWER_SUPPLY_PROP_CAPACITY,
 370         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 371         POWER_SUPPLY_PROP_TEMP,
 372         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 373         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 374         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 375         POWER_SUPPLY_PROP_TECHNOLOGY,
 376         POWER_SUPPLY_PROP_CHARGE_FULL,
 377         POWER_SUPPLY_PROP_CHARGE_NOW,
 378         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 379         POWER_SUPPLY_PROP_CYCLE_COUNT,
 380         POWER_SUPPLY_PROP_HEALTH,
 381         POWER_SUPPLY_PROP_MANUFACTURER,
 382 };
 383
 384 static enum power_supply_property bq2750x_battery_props[] = {
 385         POWER_SUPPLY_PROP_STATUS,
 386         POWER_SUPPLY_PROP_PRESENT,
 387         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 388         POWER_SUPPLY_PROP_CURRENT_NOW,
 389         POWER_SUPPLY_PROP_CAPACITY,
 390         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 391         POWER_SUPPLY_PROP_TEMP,
 392         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 393         POWER_SUPPLY_PROP_TECHNOLOGY,
 394         POWER_SUPPLY_PROP_CHARGE_FULL,
 395         POWER_SUPPLY_PROP_CHARGE_NOW,
 396         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 397         POWER_SUPPLY_PROP_CYCLE_COUNT,
 398         POWER_SUPPLY_PROP_HEALTH,
 399         POWER_SUPPLY_PROP_MANUFACTURER,
 400 };
 401
 402 static enum power_supply_property bq2751x_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_TECHNOLOGY,
 412         POWER_SUPPLY_PROP_CHARGE_FULL,
 413         POWER_SUPPLY_PROP_CHARGE_NOW,
 414         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 415         POWER_SUPPLY_PROP_CYCLE_COUNT,
 416         POWER_SUPPLY_PROP_HEALTH,
 417         POWER_SUPPLY_PROP_MANUFACTURER,
 418 };
 419
 420 static enum power_supply_property bq27500_battery_props[] = {
 421         POWER_SUPPLY_PROP_STATUS,
 422         POWER_SUPPLY_PROP_PRESENT,
 423         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 424         POWER_SUPPLY_PROP_CURRENT_NOW,
 425         POWER_SUPPLY_PROP_CAPACITY,
 426         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 427         POWER_SUPPLY_PROP_TEMP,
 428         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 429         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 430         POWER_SUPPLY_PROP_TECHNOLOGY,
 431         POWER_SUPPLY_PROP_CHARGE_FULL,
 432         POWER_SUPPLY_PROP_CHARGE_NOW,
 433         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 434         POWER_SUPPLY_PROP_CYCLE_COUNT,
 435         POWER_SUPPLY_PROP_ENERGY_NOW,
 436         POWER_SUPPLY_PROP_POWER_AVG,
 437         POWER_SUPPLY_PROP_HEALTH,
 438         POWER_SUPPLY_PROP_MANUFACTURER,
 439 };
 440
 441 static enum power_supply_property bq27510g1_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_TIME_TO_FULL_NOW,
 451         POWER_SUPPLY_PROP_TECHNOLOGY,
 452         POWER_SUPPLY_PROP_CHARGE_FULL,
 453         POWER_SUPPLY_PROP_CHARGE_NOW,
 454         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 455         POWER_SUPPLY_PROP_CYCLE_COUNT,
 456         POWER_SUPPLY_PROP_ENERGY_NOW,
 457         POWER_SUPPLY_PROP_POWER_AVG,
 458         POWER_SUPPLY_PROP_HEALTH,
 459         POWER_SUPPLY_PROP_MANUFACTURER,
 460 };
 461
 462 static enum power_supply_property bq27510g2_battery_props[] = {
 463         POWER_SUPPLY_PROP_STATUS,
 464         POWER_SUPPLY_PROP_PRESENT,
 465         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 466         POWER_SUPPLY_PROP_CURRENT_NOW,
 467         POWER_SUPPLY_PROP_CAPACITY,
 468         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 469         POWER_SUPPLY_PROP_TEMP,
 470         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 471         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 472         POWER_SUPPLY_PROP_TECHNOLOGY,
 473         POWER_SUPPLY_PROP_CHARGE_FULL,
 474         POWER_SUPPLY_PROP_CHARGE_NOW,
 475         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 476         POWER_SUPPLY_PROP_CYCLE_COUNT,
 477         POWER_SUPPLY_PROP_ENERGY_NOW,
 478         POWER_SUPPLY_PROP_POWER_AVG,
 479         POWER_SUPPLY_PROP_HEALTH,
 480         POWER_SUPPLY_PROP_MANUFACTURER,
 481 };
 482
 483 static enum power_supply_property bq27510g3_battery_props[] = {
 484         POWER_SUPPLY_PROP_STATUS,
 485         POWER_SUPPLY_PROP_PRESENT,
 486         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 487         POWER_SUPPLY_PROP_CURRENT_NOW,
 488         POWER_SUPPLY_PROP_CAPACITY,
 489         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 490         POWER_SUPPLY_PROP_TEMP,
 491         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 492         POWER_SUPPLY_PROP_TECHNOLOGY,
 493         POWER_SUPPLY_PROP_CHARGE_FULL,
 494         POWER_SUPPLY_PROP_CHARGE_NOW,
 495         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 496         POWER_SUPPLY_PROP_CYCLE_COUNT,
 497         POWER_SUPPLY_PROP_HEALTH,
 498         POWER_SUPPLY_PROP_MANUFACTURER,
 499 };
 500
 501 static enum power_supply_property bq27530_battery_props[] = {
 502         POWER_SUPPLY_PROP_STATUS,
 503         POWER_SUPPLY_PROP_PRESENT,
 504         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 505         POWER_SUPPLY_PROP_CURRENT_NOW,
 506         POWER_SUPPLY_PROP_CAPACITY,
 507         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 508         POWER_SUPPLY_PROP_TEMP,
 509         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 510         POWER_SUPPLY_PROP_TECHNOLOGY,
 511         POWER_SUPPLY_PROP_CHARGE_FULL,
 512         POWER_SUPPLY_PROP_CHARGE_NOW,
 513         POWER_SUPPLY_PROP_POWER_AVG,
 514         POWER_SUPPLY_PROP_HEALTH,
 515         POWER_SUPPLY_PROP_CYCLE_COUNT,
 516         POWER_SUPPLY_PROP_MANUFACTURER,
 517 };
 518
 519 static enum power_supply_property bq27541_battery_props[] = {
 520         POWER_SUPPLY_PROP_STATUS,
 521         POWER_SUPPLY_PROP_PRESENT,
 522         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 523         POWER_SUPPLY_PROP_CURRENT_NOW,
 524         POWER_SUPPLY_PROP_CAPACITY,
 525         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 526         POWER_SUPPLY_PROP_TEMP,
 527         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 528         POWER_SUPPLY_PROP_TECHNOLOGY,
 529         POWER_SUPPLY_PROP_CHARGE_FULL,
 530         POWER_SUPPLY_PROP_CHARGE_NOW,
 531         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 532         POWER_SUPPLY_PROP_CYCLE_COUNT,
 533         POWER_SUPPLY_PROP_POWER_AVG,
 534         POWER_SUPPLY_PROP_HEALTH,
 535         POWER_SUPPLY_PROP_MANUFACTURER,
 536 };
 537
 538 static enum power_supply_property bq27545_battery_props[] = {
 539         POWER_SUPPLY_PROP_STATUS,
 540         POWER_SUPPLY_PROP_PRESENT,
 541         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 542         POWER_SUPPLY_PROP_CURRENT_NOW,
 543         POWER_SUPPLY_PROP_CAPACITY,
 544         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 545         POWER_SUPPLY_PROP_TEMP,
 546         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 547         POWER_SUPPLY_PROP_TECHNOLOGY,
 548         POWER_SUPPLY_PROP_CHARGE_FULL,
 549         POWER_SUPPLY_PROP_CHARGE_NOW,
 550         POWER_SUPPLY_PROP_HEALTH,
 551         POWER_SUPPLY_PROP_CYCLE_COUNT,
 552         POWER_SUPPLY_PROP_POWER_AVG,
 553         POWER_SUPPLY_PROP_MANUFACTURER,
 554 };
 555
 556 static enum power_supply_property bq27421_battery_props[] = {
 557         POWER_SUPPLY_PROP_STATUS,
 558         POWER_SUPPLY_PROP_PRESENT,
 559         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 560         POWER_SUPPLY_PROP_CURRENT_NOW,
 561         POWER_SUPPLY_PROP_CAPACITY,
 562         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 563         POWER_SUPPLY_PROP_TEMP,
 564         POWER_SUPPLY_PROP_TECHNOLOGY,
 565         POWER_SUPPLY_PROP_CHARGE_FULL,
 566         POWER_SUPPLY_PROP_CHARGE_NOW,
 567         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 568         POWER_SUPPLY_PROP_MANUFACTURER,
 569 };
 570
 571 #define BQ27XXX_PROP(_id, _prop)                \
 572         [_id] = {                               \
 573                 .props = _prop,                 \
 574                 .size = ARRAY_SIZE(_prop),      \
 575         }
 576
 577 static struct {
 578         enum power_supply_property *props;
 579         size_t size;
 580 } bq27xxx_battery_props[] = {
 581         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
 582         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
 583         BQ27XXX_PROP(BQ2750X, bq2750x_battery_props),
 584         BQ27XXX_PROP(BQ2751X, bq2751x_battery_props),
 585         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
 586         BQ27XXX_PROP(BQ27510G1, bq27510g1_battery_props),
 587         BQ27XXX_PROP(BQ27510G2, bq27510g2_battery_props),
 588         BQ27XXX_PROP(BQ27510G3, bq27510g3_battery_props),
 589         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
 590         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
 591         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
 592         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
 593 };
 594
 595 static DEFINE_MUTEX(bq27xxx_list_lock);
 596 static LIST_HEAD(bq27xxx_battery_devices);
 597
 598 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
 599 {
 600         struct bq27xxx_device_info *di;
 601         unsigned int prev_val = *(unsigned int *) kp->arg;
 602         int ret;
 603
 604         ret = param_set_uint(val, kp);
 605         if (ret < 0 || prev_val == *(unsigned int *) kp->arg)
 606                 return ret;
 607
 608         mutex_lock(&bq27xxx_list_lock);
 609         list_for_each_entry(di, &bq27xxx_battery_devices, list) {
 610                 cancel_delayed_work_sync(&di->work);
 611                 schedule_delayed_work(&di->work, 0);
 612         }
 613         mutex_unlock(&bq27xxx_list_lock);
 614
 615         return ret;
 616 }
 617
 618 static const struct kernel_param_ops param_ops_poll_interval = {
 619         .get = param_get_uint,
 620         .set = poll_interval_param_set,
 621 };
 622
 623 static unsigned int poll_interval = 360;
 624 module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
 625 MODULE_PARM_DESC(poll_interval,
 626                  "battery poll interval in seconds - 0 disables polling");
 627
 628 /*
 629  * Common code for BQ27xxx devices
 630  */
 631
 632 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 633                                bool single)
 634 {
 635         /* Reports EINVAL for invalid/missing registers */
 636         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 637                 return -EINVAL;
 638
 639         return di->bus.read(di, di->regs[reg_index], single);
 640 }
 641
 642 /*
 643  * Return the battery State-of-Charge
 644  * Or < 0 if something fails.
 645  */
 646 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 647 {
 648         int soc;
 649
 650         if (di->chip == BQ27000 || di->chip == BQ27010)
 651                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
 652         else
 653                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 654
 655         if (soc < 0)
 656                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 657
 658         return soc;
 659 }
 660
 661 /*
 662  * Return a battery charge value in µAh
 663  * Or < 0 if something fails.
 664  */
 665 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 666 {
 667         int charge;
 668
 669         charge = bq27xxx_read(di, reg, false);
 670         if (charge < 0) {
 671                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 672                         reg, charge);
 673                 return charge;
 674         }
 675
 676         if (di->chip == BQ27000 || di->chip == BQ27010)
 677                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 678         else
 679                 charge *= 1000;
 680
 681         return charge;
 682 }
 683
 684 /*
 685  * Return the battery Nominal available capacity in µAh
 686  * Or < 0 if something fails.
 687  */
 688 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 689 {
 690         int flags;
 691
 692         if (di->chip == BQ27000 || di->chip == BQ27010) {
 693                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 694                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 695                         return -ENODATA;
 696         }
 697
 698         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 699 }
 700
 701 /*
 702  * Return the battery Full Charge Capacity in µAh
 703  * Or < 0 if something fails.
 704  */
 705 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 706 {
 707         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 708 }
 709
 710 /*
 711  * Return the Design Capacity in µAh
 712  * Or < 0 if something fails.
 713  */
 714 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 715 {
 716         int dcap;
 717
 718         if (di->chip == BQ27000 || di->chip == BQ27010)
 719                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
 720         else
 721                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 722
 723         if (dcap < 0) {
 724                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 725                 return dcap;
 726         }
 727
 728         if (di->chip == BQ27000 || di->chip == BQ27010)
 729                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 730         else
 731                 dcap *= 1000;
 732
 733         return dcap;
 734 }
 735
 736 /*
 737  * Return the battery Available energy in µWh
 738  * Or < 0 if something fails.
 739  */
 740 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 741 {
 742         int ae;
 743
 744         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 745         if (ae < 0) {
 746                 dev_dbg(di->dev, "error reading available energy\n");
 747                 return ae;
 748         }
 749
 750         if (di->chip == BQ27000 || di->chip == BQ27010)
 751                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 752         else
 753                 ae *= 1000;
 754
 755         return ae;
 756 }
 757
 758 /*
 759  * Return the battery temperature in tenths of degree Kelvin
 760  * Or < 0 if something fails.
 761  */
 762 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 763 {
 764         int temp;
 765
 766         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 767         if (temp < 0) {
 768                 dev_err(di->dev, "error reading temperature\n");
 769                 return temp;
 770         }
 771
 772         if (di->chip == BQ27000 || di->chip == BQ27010)
 773                 temp = 5 * temp / 2;
 774
 775         return temp;
 776 }
 777
 778 /*
 779  * Return the battery Cycle count total
 780  * Or < 0 if something fails.
 781  */
 782 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 783 {
 784         int cyct;
 785
 786         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 787         if (cyct < 0)
 788                 dev_err(di->dev, "error reading cycle count total\n");
 789
 790         return cyct;
 791 }
 792
 793 /*
 794  * Read a time register.
 795  * Return < 0 if something fails.
 796  */
 797 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 798 {
 799         int tval;
 800
 801         tval = bq27xxx_read(di, reg, false);
 802         if (tval < 0) {
 803                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 804                         reg, tval);
 805                 return tval;
 806         }
 807
 808         if (tval == 65535)
 809                 return -ENODATA;
 810
 811         return tval * 60;
 812 }
 813
 814 /*
 815  * Read an average power register.
 816  * Return < 0 if something fails.
 817  */
 818 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 819 {
 820         int tval;
 821
 822         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 823         if (tval < 0) {
 824                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 825                         BQ27XXX_REG_AP, tval);
 826                 return tval;
 827         }
 828
 829         if (di->chip == BQ27000 || di->chip == BQ27010)
 830                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 831         else
 832                 return tval;
 833 }
 834
 835 /*
 836  * Returns true if a battery over temperature condition is detected
 837  */
 838 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
 839 {
 840         switch (di->chip) {
 841         case BQ2750X:
 842         case BQ2751X:
 843         case BQ27500:
 844         case BQ27510G1:
 845         case BQ27510G2:
 846         case BQ27510G3:
 847         case BQ27541:
 848         case BQ27545:
 849                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 850         case BQ27530:
 851         case BQ27421:
 852                 return flags & BQ27XXX_FLAG_OT;
 853         default:
 854                 return false;
 855         }
 856 }
 857
 858 /*
 859  * Returns true if a battery under temperature condition is detected
 860  */
 861 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
 862 {
 863         if (di->chip == BQ27530 || di->chip == BQ27421)
 864                 return flags & BQ27XXX_FLAG_UT;
 865
 866         return false;
 867 }
 868
 869 /*
 870  * Returns true if a low state of charge condition is detected
 871  */
 872 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
 873 {
 874         if (di->chip == BQ27000 || di->chip == BQ27010)
 875                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
 876         else
 877                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
 878 }
 879
 880 /*
 881  * Read flag register.
 882  * Return < 0 if something fails.
 883  */
 884 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
 885 {
 886         int flags;
 887         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 888
 889         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 890         if (flags < 0) {
 891                 dev_err(di->dev, "error reading flag register:%d\n", flags);
 892                 return flags;
 893         }
 894
 895         /* Unlikely but important to return first */
 896         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
 897                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 898         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
 899                 return POWER_SUPPLY_HEALTH_COLD;
 900         if (unlikely(bq27xxx_battery_dead(di, flags)))
 901                 return POWER_SUPPLY_HEALTH_DEAD;
 902
 903         return POWER_SUPPLY_HEALTH_GOOD;
 904 }
 905
 906 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
 907 {
 908         struct bq27xxx_reg_cache cache = {0, };
 909         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
 910         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 911
 912         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 913         if ((cache.flags & 0xff) == 0xff)
 914                 cache.flags = -1; /* read error */
 915         if (cache.flags >= 0) {
 916                 cache.temperature = bq27xxx_battery_read_temperature(di);
 917                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
 918                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
 919                         cache.capacity = -ENODATA;
 920                         cache.energy = -ENODATA;
 921                         cache.time_to_empty = -ENODATA;
 922                         cache.time_to_empty_avg = -ENODATA;
 923                         cache.time_to_full = -ENODATA;
 924                         cache.charge_full = -ENODATA;
 925                         cache.health = -ENODATA;
 926                 } else {
 927                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
 928                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
 929                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
 930                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
 931                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
 932                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
 933                         cache.charge_full = bq27xxx_battery_read_fcc(di);
 934                         cache.capacity = bq27xxx_battery_read_soc(di);
 935                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
 936                                 cache.energy = bq27xxx_battery_read_energy(di);
 937                         cache.health = bq27xxx_battery_read_health(di);
 938                 }
 939                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
 940                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
 941                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
 942                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
 943
 944                 /* We only have to read charge design full once */
 945                 if (di->charge_design_full <= 0)
 946                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
 947         }
 948
 949         if (di->cache.capacity != cache.capacity)
 950                 power_supply_changed(di->bat);
 951
 952         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 953                 di->cache = cache;
 954
 955         di->last_update = jiffies;
 956 }
 957 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
 958
 959 static void bq27xxx_battery_poll(struct work_struct *work)
 960 {
 961         struct bq27xxx_device_info *di =
 962                         container_of(work, struct bq27xxx_device_info,
 963                                      work.work);
 964
 965         bq27xxx_battery_update(di);
 966
 967         if (poll_interval > 0)
 968                 schedule_delayed_work(&di->work, poll_interval * HZ);
 969 }
 970
 971 /*
 972  * Return the battery average current in µA
 973  * Note that current can be negative signed as well
 974  * Or 0 if something fails.
 975  */
 976 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
 977                                    union power_supply_propval *val)
 978 {
 979         int curr;
 980         int flags;
 981
 982         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
 983         if (curr < 0) {
 984                 dev_err(di->dev, "error reading current\n");
 985                 return curr;
 986         }
 987
 988         if (di->chip == BQ27000 || di->chip == BQ27010) {
 989                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 990                 if (flags & BQ27000_FLAG_CHGS) {
 991                         dev_dbg(di->dev, "negative current!\n");
 992                         curr = -curr;
 993                 }
 994
 995                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 996         } else {
 997                 /* Other gauges return signed value */
 998                 val->intval = (int)((s16)curr) * 1000;
 999         }
1000
1001         return 0;
1002 }
1003
1004 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
1005                                   union power_supply_propval *val)
1006 {
1007         int status;
1008
1009         if (di->chip == BQ27000 || di->chip == BQ27010) {
1010                 if (di->cache.flags & BQ27000_FLAG_FC)
1011                         status = POWER_SUPPLY_STATUS_FULL;
1012                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
1013                         status = POWER_SUPPLY_STATUS_CHARGING;
1014                 else if (power_supply_am_i_supplied(di->bat))
1015                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1016                 else
1017                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1018         } else {
1019                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1020                         status = POWER_SUPPLY_STATUS_FULL;
1021                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
1022                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1023                 else
1024                         status = POWER_SUPPLY_STATUS_CHARGING;
1025         }
1026
1027         val->intval = status;
1028
1029         return 0;
1030 }
1031
1032 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
1033                                           union power_supply_propval *val)
1034 {
1035         int level;
1036
1037         if (di->chip == BQ27000 || di->chip == BQ27010) {
1038                 if (di->cache.flags & BQ27000_FLAG_FC)
1039                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1040                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
1041                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1042                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
1043                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1044                 else
1045                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1046         } else {
1047                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1048                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1049                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
1050                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1051                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
1052                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1053                 else
1054                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1055         }
1056
1057         val->intval = level;
1058
1059         return 0;
1060 }
1061
1062 /*
1063  * Return the battery Voltage in millivolts
1064  * Or < 0 if something fails.
1065  */
1066 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
1067                                    union power_supply_propval *val)
1068 {
1069         int volt;
1070
1071         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
1072         if (volt < 0) {
1073                 dev_err(di->dev, "error reading voltage\n");
1074                 return volt;
1075         }
1076
1077         val->intval = volt * 1000;
1078
1079         return 0;
1080 }
1081
1082 static int bq27xxx_simple_value(int value,
1083                                 union power_supply_propval *val)
1084 {
1085         if (value < 0)
1086                 return value;
1087
1088         val->intval = value;
1089
1090         return 0;
1091 }
1092
1093 static int bq27xxx_battery_get_property(struct power_supply *psy,
1094                                         enum power_supply_property psp,
1095                                         union power_supply_propval *val)
1096 {
1097         int ret = 0;
1098         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1099
1100         mutex_lock(&di->lock);
1101         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
1102                 cancel_delayed_work_sync(&di->work);
1103                 bq27xxx_battery_poll(&di->work.work);
1104         }
1105         mutex_unlock(&di->lock);
1106
1107         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
1108                 return -ENODEV;
1109
1110         switch (psp) {
1111         case POWER_SUPPLY_PROP_STATUS:
1112                 ret = bq27xxx_battery_status(di, val);
1113                 break;
1114         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1115                 ret = bq27xxx_battery_voltage(di, val);
1116                 break;
1117         case POWER_SUPPLY_PROP_PRESENT:
1118                 val->intval = di->cache.flags < 0 ? 0 : 1;
1119                 break;
1120         case POWER_SUPPLY_PROP_CURRENT_NOW:
1121                 ret = bq27xxx_battery_current(di, val);
1122                 break;
1123         case POWER_SUPPLY_PROP_CAPACITY:
1124                 ret = bq27xxx_simple_value(di->cache.capacity, val);
1125                 break;
1126         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1127                 ret = bq27xxx_battery_capacity_level(di, val);
1128                 break;
1129         case POWER_SUPPLY_PROP_TEMP:
1130                 ret = bq27xxx_simple_value(di->cache.temperature, val);
1131                 if (ret == 0)
1132                         val->intval -= 2731; /* convert decidegree k to c */
1133                 break;
1134         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
1135                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
1136                 break;
1137         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
1138                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
1139                 break;
1140         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
1141                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
1142                 break;
1143         case POWER_SUPPLY_PROP_TECHNOLOGY:
1144                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
1145                 break;
1146         case POWER_SUPPLY_PROP_CHARGE_NOW:
1147                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
1148                 break;
1149         case POWER_SUPPLY_PROP_CHARGE_FULL:
1150                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
1151                 break;
1152         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1153                 ret = bq27xxx_simple_value(di->charge_design_full, val);
1154                 break;
1155         case POWER_SUPPLY_PROP_CYCLE_COUNT:
1156                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
1157                 break;
1158         case POWER_SUPPLY_PROP_ENERGY_NOW:
1159                 ret = bq27xxx_simple_value(di->cache.energy, val);
1160                 break;
1161         case POWER_SUPPLY_PROP_POWER_AVG:
1162                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
1163                 break;
1164         case POWER_SUPPLY_PROP_HEALTH:
1165                 ret = bq27xxx_simple_value(di->cache.health, val);
1166                 break;
1167         case POWER_SUPPLY_PROP_MANUFACTURER:
1168                 val->strval = BQ27XXX_MANUFACTURER;
1169                 break;
1170         default:
1171                 return -EINVAL;
1172         }
1173
1174         return ret;
1175 }
1176
1177 static void bq27xxx_external_power_changed(struct power_supply *psy)
1178 {
1179         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1180
1181         cancel_delayed_work_sync(&di->work);
1182         schedule_delayed_work(&di->work, 0);
1183 }
1184
1185 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1186 {
1187         struct power_supply_desc *psy_desc;
1188         struct power_supply_config psy_cfg = { .drv_data = di, };
1189
1190         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1191         mutex_init(&di->lock);
1192         di->regs = bq27xxx_regs[di->chip];
1193
1194         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1195         if (!psy_desc)
1196                 return -ENOMEM;
1197
1198         psy_desc->name = di->name;
1199         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1200         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
1201         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
1202         psy_desc->get_property = bq27xxx_battery_get_property;
1203         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1204
1205         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1206         if (IS_ERR(di->bat)) {
1207                 dev_err(di->dev, "failed to register battery\n");
1208                 return PTR_ERR(di->bat);
1209         }
1210
1211         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1212
1213         bq27xxx_battery_update(di);
1214
1215         mutex_lock(&bq27xxx_list_lock);
1216         list_add(&di->list, &bq27xxx_battery_devices);
1217         mutex_unlock(&bq27xxx_list_lock);
1218
1219         return 0;
1220 }
1221 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1222
1223 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1224 {
1225         /*
1226          * power_supply_unregister call bq27xxx_battery_get_property which
1227          * call bq27xxx_battery_poll.
1228          * Make sure that bq27xxx_battery_poll will not call
1229          * schedule_delayed_work again after unregister (which cause OOPS).
1230          */
1231         poll_interval = 0;
1232
1233         cancel_delayed_work_sync(&di->work);
1234
1235         power_supply_unregister(di->bat);
1236
1237         mutex_lock(&bq27xxx_list_lock);
1238         list_del(&di->list);
1239         mutex_unlock(&bq27xxx_list_lock);
1240
1241         mutex_destroy(&di->lock);
1242 }
1243 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1244
1245 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1246                                          bool single)
1247 {
1248         struct device *dev = di->dev;
1249         struct bq27xxx_platform_data *pdata = dev->platform_data;
1250         unsigned int timeout = 3;
1251         int upper, lower;
1252         int temp;
1253
1254         if (!single) {
1255                 /* Make sure the value has not changed in between reading the
1256                  * lower and the upper part */
1257                 upper = pdata->read(dev, reg + 1);
1258                 do {
1259                         temp = upper;
1260                         if (upper < 0)
1261                                 return upper;
1262
1263                         lower = pdata->read(dev, reg);
1264                         if (lower < 0)
1265                                 return lower;
1266
1267                         upper = pdata->read(dev, reg + 1);
1268                 } while (temp != upper && --timeout);
1269
1270                 if (timeout == 0)
1271                         return -EIO;
1272
1273                 return (upper << 8) | lower;
1274         }
1275
1276         return pdata->read(dev, reg);
1277 }
1278
1279 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1280 {
1281         struct bq27xxx_device_info *di;
1282         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1283
1284         if (!pdata) {
1285                 dev_err(&pdev->dev, "no platform_data supplied\n");
1286                 return -EINVAL;
1287         }
1288
1289         if (!pdata->read) {
1290                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1291                 return -EINVAL;
1292         }
1293
1294         if (!pdata->chip) {
1295                 dev_err(&pdev->dev, "no device supplied\n");
1296                 return -EINVAL;
1297         }
1298
1299         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1300         if (!di)
1301                 return -ENOMEM;
1302
1303         platform_set_drvdata(pdev, di);
1304
1305         di->dev = &pdev->dev;
1306         di->chip = pdata->chip;
1307         di->name = pdata->name ?: dev_name(&pdev->dev);
1308         di->bus.read = bq27xxx_battery_platform_read;
1309
1310         return bq27xxx_battery_setup(di);
1311 }
1312
1313 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1314 {
1315         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1316
1317         bq27xxx_battery_teardown(di);
1318
1319         return 0;
1320 }
1321
1322 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1323         { "bq27000-battery", },
1324         { /* sentinel */ }
1325 };
1326 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1327
1328 #ifdef CONFIG_OF
1329 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1330         { .compatible = "ti,bq27000" },
1331         {},
1332 };
1333 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1334 #endif
1335
1336 static struct platform_driver bq27xxx_battery_platform_driver = {
1337         .probe  = bq27xxx_battery_platform_probe,
1338         .remove = bq27xxx_battery_platform_remove,
1339         .driver = {
1340                 .name = "bq27000-battery",
1341                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1342         },
1343         .id_table = bq27xxx_battery_platform_id_table,
1344 };
1345 module_platform_driver(bq27xxx_battery_platform_driver);
1346
1347 MODULE_ALIAS("platform:bq27000-battery");
1348
1349 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1350 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1351 MODULE_LICENSE("GPL");