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         [BQ27500] = {
 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         [BQ27510] = {
 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         [BQ27530] = {
 187                 [BQ27XXX_REG_CTRL] = 0x00,
 188                 [BQ27XXX_REG_TEMP] = 0x06,
 189                 [BQ27XXX_REG_INT_TEMP] = 0x32,
 190                 [BQ27XXX_REG_VOLT] = 0x08,
 191                 [BQ27XXX_REG_AI] = 0x14,
 192                 [BQ27XXX_REG_FLAGS] = 0x0a,
 193                 [BQ27XXX_REG_TTE] = 0x16,
 194                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 195                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 196                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 197                 [BQ27XXX_REG_NAC] = 0x0c,
 198                 [BQ27XXX_REG_FCC] = 0x12,
 199                 [BQ27XXX_REG_CYCT] = 0x2a,
 200                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 201                 [BQ27XXX_REG_SOC] = 0x2c,
 202                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 203                 [BQ27XXX_REG_AP] = 0x24,
 204         },
 205         [BQ27541] = {
 206                 [BQ27XXX_REG_CTRL] = 0x00,
 207                 [BQ27XXX_REG_TEMP] = 0x06,
 208                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 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] = 0x3c,
 222                 [BQ27XXX_REG_AP] = 0x24,
 223         },
 224         [BQ27545] = {
 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] = INVALID_REG_ADDR,
 241                 [BQ27XXX_REG_AP] = 0x24,
 242         },
 243         [BQ27421] = {
 244                 [BQ27XXX_REG_CTRL] = 0x00,
 245                 [BQ27XXX_REG_TEMP] = 0x02,
 246                 [BQ27XXX_REG_INT_TEMP] = 0x1e,
 247                 [BQ27XXX_REG_VOLT] = 0x04,
 248                 [BQ27XXX_REG_AI] = 0x10,
 249                 [BQ27XXX_REG_FLAGS] = 0x06,
 250                 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
 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] = 0x08,
 255                 [BQ27XXX_REG_FCC] = 0x0e,
 256                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 257                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 258                 [BQ27XXX_REG_SOC] = 0x1c,
 259                 [BQ27XXX_REG_DCAP] = 0x3c,
 260                 [BQ27XXX_REG_AP] = 0x18,
 261         },
 262 };
 263
 264 static enum power_supply_property bq27000_battery_props[] = {
 265         POWER_SUPPLY_PROP_STATUS,
 266         POWER_SUPPLY_PROP_PRESENT,
 267         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 268         POWER_SUPPLY_PROP_CURRENT_NOW,
 269         POWER_SUPPLY_PROP_CAPACITY,
 270         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 271         POWER_SUPPLY_PROP_TEMP,
 272         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 273         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 274         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 275         POWER_SUPPLY_PROP_TECHNOLOGY,
 276         POWER_SUPPLY_PROP_CHARGE_FULL,
 277         POWER_SUPPLY_PROP_CHARGE_NOW,
 278         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 279         POWER_SUPPLY_PROP_CYCLE_COUNT,
 280         POWER_SUPPLY_PROP_ENERGY_NOW,
 281         POWER_SUPPLY_PROP_POWER_AVG,
 282         POWER_SUPPLY_PROP_HEALTH,
 283         POWER_SUPPLY_PROP_MANUFACTURER,
 284 };
 285
 286 static enum power_supply_property bq27010_battery_props[] = {
 287         POWER_SUPPLY_PROP_STATUS,
 288         POWER_SUPPLY_PROP_PRESENT,
 289         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 290         POWER_SUPPLY_PROP_CURRENT_NOW,
 291         POWER_SUPPLY_PROP_CAPACITY,
 292         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 293         POWER_SUPPLY_PROP_TEMP,
 294         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 295         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 296         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 297         POWER_SUPPLY_PROP_TECHNOLOGY,
 298         POWER_SUPPLY_PROP_CHARGE_FULL,
 299         POWER_SUPPLY_PROP_CHARGE_NOW,
 300         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 301         POWER_SUPPLY_PROP_CYCLE_COUNT,
 302         POWER_SUPPLY_PROP_HEALTH,
 303         POWER_SUPPLY_PROP_MANUFACTURER,
 304 };
 305
 306 static enum power_supply_property bq27500_battery_props[] = {
 307         POWER_SUPPLY_PROP_STATUS,
 308         POWER_SUPPLY_PROP_PRESENT,
 309         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 310         POWER_SUPPLY_PROP_CURRENT_NOW,
 311         POWER_SUPPLY_PROP_CAPACITY,
 312         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 313         POWER_SUPPLY_PROP_TEMP,
 314         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 315         POWER_SUPPLY_PROP_TECHNOLOGY,
 316         POWER_SUPPLY_PROP_CHARGE_FULL,
 317         POWER_SUPPLY_PROP_CHARGE_NOW,
 318         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 319         POWER_SUPPLY_PROP_CYCLE_COUNT,
 320         POWER_SUPPLY_PROP_HEALTH,
 321         POWER_SUPPLY_PROP_MANUFACTURER,
 322 };
 323
 324 static enum power_supply_property bq27510_battery_props[] = {
 325         POWER_SUPPLY_PROP_STATUS,
 326         POWER_SUPPLY_PROP_PRESENT,
 327         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 328         POWER_SUPPLY_PROP_CURRENT_NOW,
 329         POWER_SUPPLY_PROP_CAPACITY,
 330         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 331         POWER_SUPPLY_PROP_TEMP,
 332         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 333         POWER_SUPPLY_PROP_TECHNOLOGY,
 334         POWER_SUPPLY_PROP_CHARGE_FULL,
 335         POWER_SUPPLY_PROP_CHARGE_NOW,
 336         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 337         POWER_SUPPLY_PROP_CYCLE_COUNT,
 338         POWER_SUPPLY_PROP_HEALTH,
 339         POWER_SUPPLY_PROP_MANUFACTURER,
 340 };
 341
 342 static enum power_supply_property bq27530_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_TECHNOLOGY,
 352         POWER_SUPPLY_PROP_CHARGE_FULL,
 353         POWER_SUPPLY_PROP_CHARGE_NOW,
 354         POWER_SUPPLY_PROP_POWER_AVG,
 355         POWER_SUPPLY_PROP_HEALTH,
 356         POWER_SUPPLY_PROP_CYCLE_COUNT,
 357         POWER_SUPPLY_PROP_MANUFACTURER,
 358 };
 359
 360 static enum power_supply_property bq27541_battery_props[] = {
 361         POWER_SUPPLY_PROP_STATUS,
 362         POWER_SUPPLY_PROP_PRESENT,
 363         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 364         POWER_SUPPLY_PROP_CURRENT_NOW,
 365         POWER_SUPPLY_PROP_CAPACITY,
 366         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 367         POWER_SUPPLY_PROP_TEMP,
 368         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 369         POWER_SUPPLY_PROP_TECHNOLOGY,
 370         POWER_SUPPLY_PROP_CHARGE_FULL,
 371         POWER_SUPPLY_PROP_CHARGE_NOW,
 372         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 373         POWER_SUPPLY_PROP_CYCLE_COUNT,
 374         POWER_SUPPLY_PROP_POWER_AVG,
 375         POWER_SUPPLY_PROP_HEALTH,
 376         POWER_SUPPLY_PROP_MANUFACTURER,
 377 };
 378
 379 static enum power_supply_property bq27545_battery_props[] = {
 380         POWER_SUPPLY_PROP_STATUS,
 381         POWER_SUPPLY_PROP_PRESENT,
 382         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 383         POWER_SUPPLY_PROP_CURRENT_NOW,
 384         POWER_SUPPLY_PROP_CAPACITY,
 385         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 386         POWER_SUPPLY_PROP_TEMP,
 387         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 388         POWER_SUPPLY_PROP_TECHNOLOGY,
 389         POWER_SUPPLY_PROP_CHARGE_FULL,
 390         POWER_SUPPLY_PROP_CHARGE_NOW,
 391         POWER_SUPPLY_PROP_HEALTH,
 392         POWER_SUPPLY_PROP_CYCLE_COUNT,
 393         POWER_SUPPLY_PROP_POWER_AVG,
 394         POWER_SUPPLY_PROP_MANUFACTURER,
 395 };
 396
 397 static enum power_supply_property bq27421_battery_props[] = {
 398         POWER_SUPPLY_PROP_STATUS,
 399         POWER_SUPPLY_PROP_PRESENT,
 400         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 401         POWER_SUPPLY_PROP_CURRENT_NOW,
 402         POWER_SUPPLY_PROP_CAPACITY,
 403         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 404         POWER_SUPPLY_PROP_TEMP,
 405         POWER_SUPPLY_PROP_TECHNOLOGY,
 406         POWER_SUPPLY_PROP_CHARGE_FULL,
 407         POWER_SUPPLY_PROP_CHARGE_NOW,
 408         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 409         POWER_SUPPLY_PROP_MANUFACTURER,
 410 };
 411
 412 #define BQ27XXX_PROP(_id, _prop)                \
 413         [_id] = {                               \
 414                 .props = _prop,                 \
 415                 .size = ARRAY_SIZE(_prop),      \
 416         }
 417
 418 static struct {
 419         enum power_supply_property *props;
 420         size_t size;
 421 } bq27xxx_battery_props[] = {
 422         BQ27XXX_PROP(BQ27000, bq27000_battery_props),
 423         BQ27XXX_PROP(BQ27010, bq27010_battery_props),
 424         BQ27XXX_PROP(BQ27500, bq27500_battery_props),
 425         BQ27XXX_PROP(BQ27510, bq27510_battery_props),
 426         BQ27XXX_PROP(BQ27530, bq27530_battery_props),
 427         BQ27XXX_PROP(BQ27541, bq27541_battery_props),
 428         BQ27XXX_PROP(BQ27545, bq27545_battery_props),
 429         BQ27XXX_PROP(BQ27421, bq27421_battery_props),
 430 };
 431
 432 static DEFINE_MUTEX(bq27xxx_list_lock);
 433 static LIST_HEAD(bq27xxx_battery_devices);
 434
 435 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
 436 {
 437         struct bq27xxx_device_info *di;
 438         unsigned int prev_val = *(unsigned int *) kp->arg;
 439         int ret;
 440
 441         ret = param_set_uint(val, kp);
 442         if (ret < 0 || prev_val == *(unsigned int *) kp->arg)
 443                 return ret;
 444
 445         mutex_lock(&bq27xxx_list_lock);
 446         list_for_each_entry(di, &bq27xxx_battery_devices, list) {
 447                 cancel_delayed_work_sync(&di->work);
 448                 schedule_delayed_work(&di->work, 0);
 449         }
 450         mutex_unlock(&bq27xxx_list_lock);
 451
 452         return ret;
 453 }
 454
 455 static const struct kernel_param_ops param_ops_poll_interval = {
 456         .get = param_get_uint,
 457         .set = poll_interval_param_set,
 458 };
 459
 460 static unsigned int poll_interval = 360;
 461 module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
 462 MODULE_PARM_DESC(poll_interval,
 463                  "battery poll interval in seconds - 0 disables polling");
 464
 465 /*
 466  * Common code for BQ27xxx devices
 467  */
 468
 469 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 470                                bool single)
 471 {
 472         /* Reports EINVAL for invalid/missing registers */
 473         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 474                 return -EINVAL;
 475
 476         return di->bus.read(di, di->regs[reg_index], single);
 477 }
 478
 479 /*
 480  * Return the battery State-of-Charge
 481  * Or < 0 if something fails.
 482  */
 483 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 484 {
 485         int soc;
 486
 487         if (di->chip == BQ27000 || di->chip == BQ27010)
 488                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
 489         else
 490                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 491
 492         if (soc < 0)
 493                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 494
 495         return soc;
 496 }
 497
 498 /*
 499  * Return a battery charge value in µAh
 500  * Or < 0 if something fails.
 501  */
 502 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 503 {
 504         int charge;
 505
 506         charge = bq27xxx_read(di, reg, false);
 507         if (charge < 0) {
 508                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 509                         reg, charge);
 510                 return charge;
 511         }
 512
 513         if (di->chip == BQ27000 || di->chip == BQ27010)
 514                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 515         else
 516                 charge *= 1000;
 517
 518         return charge;
 519 }
 520
 521 /*
 522  * Return the battery Nominal available capacity in µAh
 523  * Or < 0 if something fails.
 524  */
 525 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 526 {
 527         int flags;
 528
 529         if (di->chip == BQ27000 || di->chip == BQ27010) {
 530                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 531                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 532                         return -ENODATA;
 533         }
 534
 535         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 536 }
 537
 538 /*
 539  * Return the battery Full Charge Capacity in µAh
 540  * Or < 0 if something fails.
 541  */
 542 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 543 {
 544         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 545 }
 546
 547 /*
 548  * Return the Design Capacity in µAh
 549  * Or < 0 if something fails.
 550  */
 551 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 552 {
 553         int dcap;
 554
 555         if (di->chip == BQ27000 || di->chip == BQ27010)
 556                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
 557         else
 558                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 559
 560         if (dcap < 0) {
 561                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 562                 return dcap;
 563         }
 564
 565         if (di->chip == BQ27000 || di->chip == BQ27010)
 566                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 567         else
 568                 dcap *= 1000;
 569
 570         return dcap;
 571 }
 572
 573 /*
 574  * Return the battery Available energy in µWh
 575  * Or < 0 if something fails.
 576  */
 577 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 578 {
 579         int ae;
 580
 581         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 582         if (ae < 0) {
 583                 dev_dbg(di->dev, "error reading available energy\n");
 584                 return ae;
 585         }
 586
 587         if (di->chip == BQ27000 || di->chip == BQ27010)
 588                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 589         else
 590                 ae *= 1000;
 591
 592         return ae;
 593 }
 594
 595 /*
 596  * Return the battery temperature in tenths of degree Kelvin
 597  * Or < 0 if something fails.
 598  */
 599 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 600 {
 601         int temp;
 602
 603         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 604         if (temp < 0) {
 605                 dev_err(di->dev, "error reading temperature\n");
 606                 return temp;
 607         }
 608
 609         if (di->chip == BQ27000 || di->chip == BQ27010)
 610                 temp = 5 * temp / 2;
 611
 612         return temp;
 613 }
 614
 615 /*
 616  * Return the battery Cycle count total
 617  * Or < 0 if something fails.
 618  */
 619 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 620 {
 621         int cyct;
 622
 623         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 624         if (cyct < 0)
 625                 dev_err(di->dev, "error reading cycle count total\n");
 626
 627         return cyct;
 628 }
 629
 630 /*
 631  * Read a time register.
 632  * Return < 0 if something fails.
 633  */
 634 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 635 {
 636         int tval;
 637
 638         tval = bq27xxx_read(di, reg, false);
 639         if (tval < 0) {
 640                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 641                         reg, tval);
 642                 return tval;
 643         }
 644
 645         if (tval == 65535)
 646                 return -ENODATA;
 647
 648         return tval * 60;
 649 }
 650
 651 /*
 652  * Read an average power register.
 653  * Return < 0 if something fails.
 654  */
 655 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 656 {
 657         int tval;
 658
 659         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 660         if (tval < 0) {
 661                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 662                         BQ27XXX_REG_AP, tval);
 663                 return tval;
 664         }
 665
 666         if (di->chip == BQ27000 || di->chip == BQ27010)
 667                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 668         else
 669                 return tval;
 670 }
 671
 672 /*
 673  * Returns true if a battery over temperature condition is detected
 674  */
 675 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
 676 {
 677         if (di->chip == BQ27500 || di->chip == BQ27510 ||
 678             di->chip == BQ27541 || di->chip == BQ27545)
 679                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 680         if (di->chip == BQ27530 || di->chip == BQ27421)
 681                 return flags & BQ27XXX_FLAG_OT;
 682
 683         return false;
 684 }
 685
 686 /*
 687  * Returns true if a battery under temperature condition is detected
 688  */
 689 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
 690 {
 691         if (di->chip == BQ27530 || di->chip == BQ27421)
 692                 return flags & BQ27XXX_FLAG_UT;
 693
 694         return false;
 695 }
 696
 697 /*
 698  * Returns true if a low state of charge condition is detected
 699  */
 700 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
 701 {
 702         if (di->chip == BQ27000 || di->chip == BQ27010)
 703                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
 704         else
 705                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
 706 }
 707
 708 /*
 709  * Read flag register.
 710  * Return < 0 if something fails.
 711  */
 712 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
 713 {
 714         int flags;
 715         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 716
 717         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 718         if (flags < 0) {
 719                 dev_err(di->dev, "error reading flag register:%d\n", flags);
 720                 return flags;
 721         }
 722
 723         /* Unlikely but important to return first */
 724         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
 725                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 726         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
 727                 return POWER_SUPPLY_HEALTH_COLD;
 728         if (unlikely(bq27xxx_battery_dead(di, flags)))
 729                 return POWER_SUPPLY_HEALTH_DEAD;
 730
 731         return POWER_SUPPLY_HEALTH_GOOD;
 732 }
 733
 734 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
 735 {
 736         struct bq27xxx_reg_cache cache = {0, };
 737         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
 738         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 739
 740         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 741         if ((cache.flags & 0xff) == 0xff)
 742                 cache.flags = -1; /* read error */
 743         if (cache.flags >= 0) {
 744                 cache.temperature = bq27xxx_battery_read_temperature(di);
 745                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
 746                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
 747                         cache.capacity = -ENODATA;
 748                         cache.energy = -ENODATA;
 749                         cache.time_to_empty = -ENODATA;
 750                         cache.time_to_empty_avg = -ENODATA;
 751                         cache.time_to_full = -ENODATA;
 752                         cache.charge_full = -ENODATA;
 753                         cache.health = -ENODATA;
 754                 } else {
 755                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
 756                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
 757                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
 758                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
 759                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
 760                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
 761                         cache.charge_full = bq27xxx_battery_read_fcc(di);
 762                         cache.capacity = bq27xxx_battery_read_soc(di);
 763                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
 764                                 cache.energy = bq27xxx_battery_read_energy(di);
 765                         cache.health = bq27xxx_battery_read_health(di);
 766                 }
 767                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
 768                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
 769                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
 770                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
 771
 772                 /* We only have to read charge design full once */
 773                 if (di->charge_design_full <= 0)
 774                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
 775         }
 776
 777         if (di->cache.capacity != cache.capacity)
 778                 power_supply_changed(di->bat);
 779
 780         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 781                 di->cache = cache;
 782
 783         di->last_update = jiffies;
 784 }
 785 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
 786
 787 static void bq27xxx_battery_poll(struct work_struct *work)
 788 {
 789         struct bq27xxx_device_info *di =
 790                         container_of(work, struct bq27xxx_device_info,
 791                                      work.work);
 792
 793         bq27xxx_battery_update(di);
 794
 795         if (poll_interval > 0)
 796                 schedule_delayed_work(&di->work, poll_interval * HZ);
 797 }
 798
 799 /*
 800  * Return the battery average current in µA
 801  * Note that current can be negative signed as well
 802  * Or 0 if something fails.
 803  */
 804 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
 805                                    union power_supply_propval *val)
 806 {
 807         int curr;
 808         int flags;
 809
 810         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
 811         if (curr < 0) {
 812                 dev_err(di->dev, "error reading current\n");
 813                 return curr;
 814         }
 815
 816         if (di->chip == BQ27000 || di->chip == BQ27010) {
 817                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 818                 if (flags & BQ27000_FLAG_CHGS) {
 819                         dev_dbg(di->dev, "negative current!\n");
 820                         curr = -curr;
 821                 }
 822
 823                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 824         } else {
 825                 /* Other gauges return signed value */
 826                 val->intval = (int)((s16)curr) * 1000;
 827         }
 828
 829         return 0;
 830 }
 831
 832 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
 833                                   union power_supply_propval *val)
 834 {
 835         int status;
 836
 837         if (di->chip == BQ27000 || di->chip == BQ27010) {
 838                 if (di->cache.flags & BQ27000_FLAG_FC)
 839                         status = POWER_SUPPLY_STATUS_FULL;
 840                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 841                         status = POWER_SUPPLY_STATUS_CHARGING;
 842                 else if (power_supply_am_i_supplied(di->bat))
 843                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 844                 else
 845                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 846         } else {
 847                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 848                         status = POWER_SUPPLY_STATUS_FULL;
 849                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
 850                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 851                 else
 852                         status = POWER_SUPPLY_STATUS_CHARGING;
 853         }
 854
 855         val->intval = status;
 856
 857         return 0;
 858 }
 859
 860 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
 861                                           union power_supply_propval *val)
 862 {
 863         int level;
 864
 865         if (di->chip == BQ27000 || di->chip == BQ27010) {
 866                 if (di->cache.flags & BQ27000_FLAG_FC)
 867                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 868                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 869                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 870                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 871                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 872                 else
 873                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 874         } else {
 875                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 876                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 877                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
 878                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 879                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
 880                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 881                 else
 882                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 883         }
 884
 885         val->intval = level;
 886
 887         return 0;
 888 }
 889
 890 /*
 891  * Return the battery Voltage in millivolts
 892  * Or < 0 if something fails.
 893  */
 894 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
 895                                    union power_supply_propval *val)
 896 {
 897         int volt;
 898
 899         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
 900         if (volt < 0) {
 901                 dev_err(di->dev, "error reading voltage\n");
 902                 return volt;
 903         }
 904
 905         val->intval = volt * 1000;
 906
 907         return 0;
 908 }
 909
 910 static int bq27xxx_simple_value(int value,
 911                                 union power_supply_propval *val)
 912 {
 913         if (value < 0)
 914                 return value;
 915
 916         val->intval = value;
 917
 918         return 0;
 919 }
 920
 921 static int bq27xxx_battery_get_property(struct power_supply *psy,
 922                                         enum power_supply_property psp,
 923                                         union power_supply_propval *val)
 924 {
 925         int ret = 0;
 926         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
 927
 928         mutex_lock(&di->lock);
 929         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 930                 cancel_delayed_work_sync(&di->work);
 931                 bq27xxx_battery_poll(&di->work.work);
 932         }
 933         mutex_unlock(&di->lock);
 934
 935         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 936                 return -ENODEV;
 937
 938         switch (psp) {
 939         case POWER_SUPPLY_PROP_STATUS:
 940                 ret = bq27xxx_battery_status(di, val);
 941                 break;
 942         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 943                 ret = bq27xxx_battery_voltage(di, val);
 944                 break;
 945         case POWER_SUPPLY_PROP_PRESENT:
 946                 val->intval = di->cache.flags < 0 ? 0 : 1;
 947                 break;
 948         case POWER_SUPPLY_PROP_CURRENT_NOW:
 949                 ret = bq27xxx_battery_current(di, val);
 950                 break;
 951         case POWER_SUPPLY_PROP_CAPACITY:
 952                 ret = bq27xxx_simple_value(di->cache.capacity, val);
 953                 break;
 954         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 955                 ret = bq27xxx_battery_capacity_level(di, val);
 956                 break;
 957         case POWER_SUPPLY_PROP_TEMP:
 958                 ret = bq27xxx_simple_value(di->cache.temperature, val);
 959                 if (ret == 0)
 960                         val->intval -= 2731; /* convert decidegree k to c */
 961                 break;
 962         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 963                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
 964                 break;
 965         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 966                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
 967                 break;
 968         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 969                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
 970                 break;
 971         case POWER_SUPPLY_PROP_TECHNOLOGY:
 972                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 973                 break;
 974         case POWER_SUPPLY_PROP_CHARGE_NOW:
 975                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
 976                 break;
 977         case POWER_SUPPLY_PROP_CHARGE_FULL:
 978                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
 979                 break;
 980         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 981                 ret = bq27xxx_simple_value(di->charge_design_full, val);
 982                 break;
 983         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 984                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
 985                 break;
 986         case POWER_SUPPLY_PROP_ENERGY_NOW:
 987                 ret = bq27xxx_simple_value(di->cache.energy, val);
 988                 break;
 989         case POWER_SUPPLY_PROP_POWER_AVG:
 990                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
 991                 break;
 992         case POWER_SUPPLY_PROP_HEALTH:
 993                 ret = bq27xxx_simple_value(di->cache.health, val);
 994                 break;
 995         case POWER_SUPPLY_PROP_MANUFACTURER:
 996                 val->strval = BQ27XXX_MANUFACTURER;
 997                 break;
 998         default:
 999                 return -EINVAL;
1000         }
1001
1002         return ret;
1003 }
1004
1005 static void bq27xxx_external_power_changed(struct power_supply *psy)
1006 {
1007         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1008
1009         cancel_delayed_work_sync(&di->work);
1010         schedule_delayed_work(&di->work, 0);
1011 }
1012
1013 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1014 {
1015         struct power_supply_desc *psy_desc;
1016         struct power_supply_config psy_cfg = { .drv_data = di, };
1017
1018         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1019         mutex_init(&di->lock);
1020         di->regs = bq27xxx_regs[di->chip];
1021
1022         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1023         if (!psy_desc)
1024                 return -ENOMEM;
1025
1026         psy_desc->name = di->name;
1027         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1028         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
1029         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
1030         psy_desc->get_property = bq27xxx_battery_get_property;
1031         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1032
1033         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1034         if (IS_ERR(di->bat)) {
1035                 dev_err(di->dev, "failed to register battery\n");
1036                 return PTR_ERR(di->bat);
1037         }
1038
1039         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1040
1041         bq27xxx_battery_update(di);
1042
1043         mutex_lock(&bq27xxx_list_lock);
1044         list_add(&di->list, &bq27xxx_battery_devices);
1045         mutex_unlock(&bq27xxx_list_lock);
1046
1047         return 0;
1048 }
1049 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1050
1051 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1052 {
1053         /*
1054          * power_supply_unregister call bq27xxx_battery_get_property which
1055          * call bq27xxx_battery_poll.
1056          * Make sure that bq27xxx_battery_poll will not call
1057          * schedule_delayed_work again after unregister (which cause OOPS).
1058          */
1059         poll_interval = 0;
1060
1061         cancel_delayed_work_sync(&di->work);
1062
1063         power_supply_unregister(di->bat);
1064
1065         mutex_lock(&bq27xxx_list_lock);
1066         list_del(&di->list);
1067         mutex_unlock(&bq27xxx_list_lock);
1068
1069         mutex_destroy(&di->lock);
1070 }
1071 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1072
1073 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1074                                          bool single)
1075 {
1076         struct device *dev = di->dev;
1077         struct bq27xxx_platform_data *pdata = dev->platform_data;
1078         unsigned int timeout = 3;
1079         int upper, lower;
1080         int temp;
1081
1082         if (!single) {
1083                 /* Make sure the value has not changed in between reading the
1084                  * lower and the upper part */
1085                 upper = pdata->read(dev, reg + 1);
1086                 do {
1087                         temp = upper;
1088                         if (upper < 0)
1089                                 return upper;
1090
1091                         lower = pdata->read(dev, reg);
1092                         if (lower < 0)
1093                                 return lower;
1094
1095                         upper = pdata->read(dev, reg + 1);
1096                 } while (temp != upper && --timeout);
1097
1098                 if (timeout == 0)
1099                         return -EIO;
1100
1101                 return (upper << 8) | lower;
1102         }
1103
1104         return pdata->read(dev, reg);
1105 }
1106
1107 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1108 {
1109         struct bq27xxx_device_info *di;
1110         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1111
1112         if (!pdata) {
1113                 dev_err(&pdev->dev, "no platform_data supplied\n");
1114                 return -EINVAL;
1115         }
1116
1117         if (!pdata->read) {
1118                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1119                 return -EINVAL;
1120         }
1121
1122         if (!pdata->chip) {
1123                 dev_err(&pdev->dev, "no device supplied\n");
1124                 return -EINVAL;
1125         }
1126
1127         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1128         if (!di)
1129                 return -ENOMEM;
1130
1131         platform_set_drvdata(pdev, di);
1132
1133         di->dev = &pdev->dev;
1134         di->chip = pdata->chip;
1135         di->name = pdata->name ?: dev_name(&pdev->dev);
1136         di->bus.read = bq27xxx_battery_platform_read;
1137
1138         return bq27xxx_battery_setup(di);
1139 }
1140
1141 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1142 {
1143         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1144
1145         bq27xxx_battery_teardown(di);
1146
1147         return 0;
1148 }
1149
1150 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1151         { "bq27000-battery", },
1152         { /* sentinel */ }
1153 };
1154 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1155
1156 #ifdef CONFIG_OF
1157 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1158         { .compatible = "ti,bq27000" },
1159         {},
1160 };
1161 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1162 #endif
1163
1164 static struct platform_driver bq27xxx_battery_platform_driver = {
1165         .probe  = bq27xxx_battery_platform_probe,
1166         .remove = bq27xxx_battery_platform_remove,
1167         .driver = {
1168                 .name = "bq27000-battery",
1169                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1170         },
1171         .id_table = bq27xxx_battery_platform_id_table,
1172 };
1173 module_platform_driver(bq27xxx_battery_platform_driver);
1174
1175 MODULE_ALIAS("platform:bq27000-battery");
1176
1177 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1178 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1179 MODULE_LICENSE("GPL");