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         int ret;
 439
 440         ret = param_set_uint(val, kp);
 441         if (ret < 0)
 442                 return ret;
 443
 444         mutex_lock(&bq27xxx_list_lock);
 445         list_for_each_entry(di, &bq27xxx_battery_devices, list) {
 446                 cancel_delayed_work_sync(&di->work);
 447                 schedule_delayed_work(&di->work, 0);
 448         }
 449         mutex_unlock(&bq27xxx_list_lock);
 450
 451         return ret;
 452 }
 453
 454 static const struct kernel_param_ops param_ops_poll_interval = {
 455         .get = param_get_uint,
 456         .set = poll_interval_param_set,
 457 };
 458
 459 static unsigned int poll_interval = 360;
 460 module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
 461 MODULE_PARM_DESC(poll_interval,
 462                  "battery poll interval in seconds - 0 disables polling");
 463
 464 /*
 465  * Common code for BQ27xxx devices
 466  */
 467
 468 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 469                                bool single)
 470 {
 471         /* Reports EINVAL for invalid/missing registers */
 472         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 473                 return -EINVAL;
 474
 475         return di->bus.read(di, di->regs[reg_index], single);
 476 }
 477
 478 /*
 479  * Return the battery State-of-Charge
 480  * Or < 0 if something fails.
 481  */
 482 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
 483 {
 484         int soc;
 485
 486         if (di->chip == BQ27000 || di->chip == BQ27010)
 487                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
 488         else
 489                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
 490
 491         if (soc < 0)
 492                 dev_dbg(di->dev, "error reading State-of-Charge\n");
 493
 494         return soc;
 495 }
 496
 497 /*
 498  * Return a battery charge value in µAh
 499  * Or < 0 if something fails.
 500  */
 501 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
 502 {
 503         int charge;
 504
 505         charge = bq27xxx_read(di, reg, false);
 506         if (charge < 0) {
 507                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
 508                         reg, charge);
 509                 return charge;
 510         }
 511
 512         if (di->chip == BQ27000 || di->chip == BQ27010)
 513                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 514         else
 515                 charge *= 1000;
 516
 517         return charge;
 518 }
 519
 520 /*
 521  * Return the battery Nominal available capacity in µAh
 522  * Or < 0 if something fails.
 523  */
 524 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
 525 {
 526         int flags;
 527
 528         if (di->chip == BQ27000 || di->chip == BQ27010) {
 529                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 530                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
 531                         return -ENODATA;
 532         }
 533
 534         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
 535 }
 536
 537 /*
 538  * Return the battery Full Charge Capacity in µAh
 539  * Or < 0 if something fails.
 540  */
 541 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
 542 {
 543         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
 544 }
 545
 546 /*
 547  * Return the Design Capacity in µAh
 548  * Or < 0 if something fails.
 549  */
 550 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
 551 {
 552         int dcap;
 553
 554         if (di->chip == BQ27000 || di->chip == BQ27010)
 555                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
 556         else
 557                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
 558
 559         if (dcap < 0) {
 560                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
 561                 return dcap;
 562         }
 563
 564         if (di->chip == BQ27000 || di->chip == BQ27010)
 565                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 566         else
 567                 dcap *= 1000;
 568
 569         return dcap;
 570 }
 571
 572 /*
 573  * Return the battery Available energy in µWh
 574  * Or < 0 if something fails.
 575  */
 576 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
 577 {
 578         int ae;
 579
 580         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
 581         if (ae < 0) {
 582                 dev_dbg(di->dev, "error reading available energy\n");
 583                 return ae;
 584         }
 585
 586         if (di->chip == BQ27000 || di->chip == BQ27010)
 587                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
 588         else
 589                 ae *= 1000;
 590
 591         return ae;
 592 }
 593
 594 /*
 595  * Return the battery temperature in tenths of degree Kelvin
 596  * Or < 0 if something fails.
 597  */
 598 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
 599 {
 600         int temp;
 601
 602         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
 603         if (temp < 0) {
 604                 dev_err(di->dev, "error reading temperature\n");
 605                 return temp;
 606         }
 607
 608         if (di->chip == BQ27000 || di->chip == BQ27010)
 609                 temp = 5 * temp / 2;
 610
 611         return temp;
 612 }
 613
 614 /*
 615  * Return the battery Cycle count total
 616  * Or < 0 if something fails.
 617  */
 618 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
 619 {
 620         int cyct;
 621
 622         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
 623         if (cyct < 0)
 624                 dev_err(di->dev, "error reading cycle count total\n");
 625
 626         return cyct;
 627 }
 628
 629 /*
 630  * Read a time register.
 631  * Return < 0 if something fails.
 632  */
 633 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
 634 {
 635         int tval;
 636
 637         tval = bq27xxx_read(di, reg, false);
 638         if (tval < 0) {
 639                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
 640                         reg, tval);
 641                 return tval;
 642         }
 643
 644         if (tval == 65535)
 645                 return -ENODATA;
 646
 647         return tval * 60;
 648 }
 649
 650 /*
 651  * Read an average power register.
 652  * Return < 0 if something fails.
 653  */
 654 static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
 655 {
 656         int tval;
 657
 658         tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
 659         if (tval < 0) {
 660                 dev_err(di->dev, "error reading average power register  %02x: %d\n",
 661                         BQ27XXX_REG_AP, tval);
 662                 return tval;
 663         }
 664
 665         if (di->chip == BQ27000 || di->chip == BQ27010)
 666                 return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
 667         else
 668                 return tval;
 669 }
 670
 671 /*
 672  * Returns true if a battery over temperature condition is detected
 673  */
 674 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
 675 {
 676         if (di->chip == BQ27500 || di->chip == BQ27510 ||
 677             di->chip == BQ27541 || di->chip == BQ27545)
 678                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
 679         if (di->chip == BQ27530 || di->chip == BQ27421)
 680                 return flags & BQ27XXX_FLAG_OT;
 681
 682         return false;
 683 }
 684
 685 /*
 686  * Returns true if a battery under temperature condition is detected
 687  */
 688 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
 689 {
 690         if (di->chip == BQ27530 || di->chip == BQ27421)
 691                 return flags & BQ27XXX_FLAG_UT;
 692
 693         return false;
 694 }
 695
 696 /*
 697  * Returns true if a low state of charge condition is detected
 698  */
 699 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
 700 {
 701         if (di->chip == BQ27000 || di->chip == BQ27010)
 702                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
 703         else
 704                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
 705 }
 706
 707 /*
 708  * Read flag register.
 709  * Return < 0 if something fails.
 710  */
 711 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
 712 {
 713         int flags;
 714         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 715
 716         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 717         if (flags < 0) {
 718                 dev_err(di->dev, "error reading flag register:%d\n", flags);
 719                 return flags;
 720         }
 721
 722         /* Unlikely but important to return first */
 723         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
 724                 return POWER_SUPPLY_HEALTH_OVERHEAT;
 725         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
 726                 return POWER_SUPPLY_HEALTH_COLD;
 727         if (unlikely(bq27xxx_battery_dead(di, flags)))
 728                 return POWER_SUPPLY_HEALTH_DEAD;
 729
 730         return POWER_SUPPLY_HEALTH_GOOD;
 731 }
 732
 733 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
 734 {
 735         struct bq27xxx_reg_cache cache = {0, };
 736         bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
 737         bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
 738
 739         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
 740         if ((cache.flags & 0xff) == 0xff)
 741                 cache.flags = -1; /* read error */
 742         if (cache.flags >= 0) {
 743                 cache.temperature = bq27xxx_battery_read_temperature(di);
 744                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
 745                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
 746                         cache.capacity = -ENODATA;
 747                         cache.energy = -ENODATA;
 748                         cache.time_to_empty = -ENODATA;
 749                         cache.time_to_empty_avg = -ENODATA;
 750                         cache.time_to_full = -ENODATA;
 751                         cache.charge_full = -ENODATA;
 752                         cache.health = -ENODATA;
 753                 } else {
 754                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
 755                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
 756                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
 757                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
 758                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
 759                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
 760                         cache.charge_full = bq27xxx_battery_read_fcc(di);
 761                         cache.capacity = bq27xxx_battery_read_soc(di);
 762                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
 763                                 cache.energy = bq27xxx_battery_read_energy(di);
 764                         cache.health = bq27xxx_battery_read_health(di);
 765                 }
 766                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
 767                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
 768                 if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
 769                         cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
 770
 771                 /* We only have to read charge design full once */
 772                 if (di->charge_design_full <= 0)
 773                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
 774         }
 775
 776         if (di->cache.capacity != cache.capacity)
 777                 power_supply_changed(di->bat);
 778
 779         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
 780                 di->cache = cache;
 781
 782         di->last_update = jiffies;
 783 }
 784 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
 785
 786 static void bq27xxx_battery_poll(struct work_struct *work)
 787 {
 788         struct bq27xxx_device_info *di =
 789                         container_of(work, struct bq27xxx_device_info,
 790                                      work.work);
 791
 792         bq27xxx_battery_update(di);
 793
 794         if (poll_interval > 0)
 795                 schedule_delayed_work(&di->work, poll_interval * HZ);
 796 }
 797
 798 /*
 799  * Return the battery average current in µA
 800  * Note that current can be negative signed as well
 801  * Or 0 if something fails.
 802  */
 803 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
 804                                    union power_supply_propval *val)
 805 {
 806         int curr;
 807         int flags;
 808
 809         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
 810         if (curr < 0) {
 811                 dev_err(di->dev, "error reading current\n");
 812                 return curr;
 813         }
 814
 815         if (di->chip == BQ27000 || di->chip == BQ27010) {
 816                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
 817                 if (flags & BQ27000_FLAG_CHGS) {
 818                         dev_dbg(di->dev, "negative current!\n");
 819                         curr = -curr;
 820                 }
 821
 822                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
 823         } else {
 824                 /* Other gauges return signed value */
 825                 val->intval = (int)((s16)curr) * 1000;
 826         }
 827
 828         return 0;
 829 }
 830
 831 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
 832                                   union power_supply_propval *val)
 833 {
 834         int status;
 835
 836         if (di->chip == BQ27000 || di->chip == BQ27010) {
 837                 if (di->cache.flags & BQ27000_FLAG_FC)
 838                         status = POWER_SUPPLY_STATUS_FULL;
 839                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
 840                         status = POWER_SUPPLY_STATUS_CHARGING;
 841                 else if (power_supply_am_i_supplied(di->bat))
 842                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 843                 else
 844                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 845         } else {
 846                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 847                         status = POWER_SUPPLY_STATUS_FULL;
 848                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
 849                         status = POWER_SUPPLY_STATUS_DISCHARGING;
 850                 else
 851                         status = POWER_SUPPLY_STATUS_CHARGING;
 852         }
 853
 854         val->intval = status;
 855
 856         return 0;
 857 }
 858
 859 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
 860                                           union power_supply_propval *val)
 861 {
 862         int level;
 863
 864         if (di->chip == BQ27000 || di->chip == BQ27010) {
 865                 if (di->cache.flags & BQ27000_FLAG_FC)
 866                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 867                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
 868                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 869                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
 870                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 871                 else
 872                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 873         } else {
 874                 if (di->cache.flags & BQ27XXX_FLAG_FC)
 875                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 876                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
 877                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 878                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
 879                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 880                 else
 881                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 882         }
 883
 884         val->intval = level;
 885
 886         return 0;
 887 }
 888
 889 /*
 890  * Return the battery Voltage in millivolts
 891  * Or < 0 if something fails.
 892  */
 893 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
 894                                    union power_supply_propval *val)
 895 {
 896         int volt;
 897
 898         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
 899         if (volt < 0) {
 900                 dev_err(di->dev, "error reading voltage\n");
 901                 return volt;
 902         }
 903
 904         val->intval = volt * 1000;
 905
 906         return 0;
 907 }
 908
 909 static int bq27xxx_simple_value(int value,
 910                                 union power_supply_propval *val)
 911 {
 912         if (value < 0)
 913                 return value;
 914
 915         val->intval = value;
 916
 917         return 0;
 918 }
 919
 920 static int bq27xxx_battery_get_property(struct power_supply *psy,
 921                                         enum power_supply_property psp,
 922                                         union power_supply_propval *val)
 923 {
 924         int ret = 0;
 925         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
 926
 927         mutex_lock(&di->lock);
 928         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
 929                 cancel_delayed_work_sync(&di->work);
 930                 bq27xxx_battery_poll(&di->work.work);
 931         }
 932         mutex_unlock(&di->lock);
 933
 934         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
 935                 return -ENODEV;
 936
 937         switch (psp) {
 938         case POWER_SUPPLY_PROP_STATUS:
 939                 ret = bq27xxx_battery_status(di, val);
 940                 break;
 941         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 942                 ret = bq27xxx_battery_voltage(di, val);
 943                 break;
 944         case POWER_SUPPLY_PROP_PRESENT:
 945                 val->intval = di->cache.flags < 0 ? 0 : 1;
 946                 break;
 947         case POWER_SUPPLY_PROP_CURRENT_NOW:
 948                 ret = bq27xxx_battery_current(di, val);
 949                 break;
 950         case POWER_SUPPLY_PROP_CAPACITY:
 951                 ret = bq27xxx_simple_value(di->cache.capacity, val);
 952                 break;
 953         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 954                 ret = bq27xxx_battery_capacity_level(di, val);
 955                 break;
 956         case POWER_SUPPLY_PROP_TEMP:
 957                 ret = bq27xxx_simple_value(di->cache.temperature, val);
 958                 if (ret == 0)
 959                         val->intval -= 2731; /* convert decidegree k to c */
 960                 break;
 961         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 962                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
 963                 break;
 964         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
 965                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
 966                 break;
 967         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
 968                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
 969                 break;
 970         case POWER_SUPPLY_PROP_TECHNOLOGY:
 971                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 972                 break;
 973         case POWER_SUPPLY_PROP_CHARGE_NOW:
 974                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
 975                 break;
 976         case POWER_SUPPLY_PROP_CHARGE_FULL:
 977                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
 978                 break;
 979         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 980                 ret = bq27xxx_simple_value(di->charge_design_full, val);
 981                 break;
 982         case POWER_SUPPLY_PROP_CYCLE_COUNT:
 983                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
 984                 break;
 985         case POWER_SUPPLY_PROP_ENERGY_NOW:
 986                 ret = bq27xxx_simple_value(di->cache.energy, val);
 987                 break;
 988         case POWER_SUPPLY_PROP_POWER_AVG:
 989                 ret = bq27xxx_simple_value(di->cache.power_avg, val);
 990                 break;
 991         case POWER_SUPPLY_PROP_HEALTH:
 992                 ret = bq27xxx_simple_value(di->cache.health, val);
 993                 break;
 994         case POWER_SUPPLY_PROP_MANUFACTURER:
 995                 val->strval = BQ27XXX_MANUFACTURER;
 996                 break;
 997         default:
 998                 return -EINVAL;
 999         }
1000
1001         return ret;
1002 }
1003
1004 static void bq27xxx_external_power_changed(struct power_supply *psy)
1005 {
1006         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1007
1008         cancel_delayed_work_sync(&di->work);
1009         schedule_delayed_work(&di->work, 0);
1010 }
1011
1012 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1013 {
1014         struct power_supply_desc *psy_desc;
1015         struct power_supply_config psy_cfg = { .drv_data = di, };
1016
1017         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1018         mutex_init(&di->lock);
1019         di->regs = bq27xxx_regs[di->chip];
1020
1021         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1022         if (!psy_desc)
1023                 return -ENOMEM;
1024
1025         psy_desc->name = di->name;
1026         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1027         psy_desc->properties = bq27xxx_battery_props[di->chip].props;
1028         psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
1029         psy_desc->get_property = bq27xxx_battery_get_property;
1030         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1031
1032         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1033         if (IS_ERR(di->bat)) {
1034                 if (PTR_ERR(di->bat) == -EPROBE_DEFER)
1035                         dev_dbg(di->dev, "failed to register battery, deferring probe\n");
1036                 else
1037                         dev_err(di->dev, "failed to register battery\n");
1038                 return PTR_ERR(di->bat);
1039         }
1040
1041         dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
1042
1043         bq27xxx_battery_update(di);
1044
1045         mutex_lock(&bq27xxx_list_lock);
1046         list_add(&di->list, &bq27xxx_battery_devices);
1047         mutex_unlock(&bq27xxx_list_lock);
1048
1049         return 0;
1050 }
1051 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1052
1053 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1054 {
1055         /*
1056          * power_supply_unregister call bq27xxx_battery_get_property which
1057          * call bq27xxx_battery_poll.
1058          * Make sure that bq27xxx_battery_poll will not call
1059          * schedule_delayed_work again after unregister (which cause OOPS).
1060          */
1061         poll_interval = 0;
1062
1063         cancel_delayed_work_sync(&di->work);
1064
1065         power_supply_unregister(di->bat);
1066
1067         mutex_lock(&bq27xxx_list_lock);
1068         list_del(&di->list);
1069         mutex_unlock(&bq27xxx_list_lock);
1070
1071         mutex_destroy(&di->lock);
1072 }
1073 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1074
1075 static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
1076                                          bool single)
1077 {
1078         struct device *dev = di->dev;
1079         struct bq27xxx_platform_data *pdata = dev->platform_data;
1080         unsigned int timeout = 3;
1081         int upper, lower;
1082         int temp;
1083
1084         if (!single) {
1085                 /* Make sure the value has not changed in between reading the
1086                  * lower and the upper part */
1087                 upper = pdata->read(dev, reg + 1);
1088                 do {
1089                         temp = upper;
1090                         if (upper < 0)
1091                                 return upper;
1092
1093                         lower = pdata->read(dev, reg);
1094                         if (lower < 0)
1095                                 return lower;
1096
1097                         upper = pdata->read(dev, reg + 1);
1098                 } while (temp != upper && --timeout);
1099
1100                 if (timeout == 0)
1101                         return -EIO;
1102
1103                 return (upper << 8) | lower;
1104         }
1105
1106         return pdata->read(dev, reg);
1107 }
1108
1109 static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
1110 {
1111         struct bq27xxx_device_info *di;
1112         struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
1113
1114         if (!pdata) {
1115                 dev_err(&pdev->dev, "no platform_data supplied\n");
1116                 return -EINVAL;
1117         }
1118
1119         if (!pdata->read) {
1120                 dev_err(&pdev->dev, "no hdq read callback supplied\n");
1121                 return -EINVAL;
1122         }
1123
1124         if (!pdata->chip) {
1125                 dev_err(&pdev->dev, "no device supplied\n");
1126                 return -EINVAL;
1127         }
1128
1129         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
1130         if (!di)
1131                 return -ENOMEM;
1132
1133         platform_set_drvdata(pdev, di);
1134
1135         di->dev = &pdev->dev;
1136         di->chip = pdata->chip;
1137         di->name = pdata->name ?: dev_name(&pdev->dev);
1138         di->bus.read = bq27xxx_battery_platform_read;
1139
1140         return bq27xxx_battery_setup(di);
1141 }
1142
1143 static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
1144 {
1145         struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
1146
1147         bq27xxx_battery_teardown(di);
1148
1149         return 0;
1150 }
1151
1152 static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
1153         { "bq27000-battery", },
1154         { /* sentinel */ }
1155 };
1156 MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
1157
1158 #ifdef CONFIG_OF
1159 static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
1160         { .compatible = "ti,bq27000" },
1161         {},
1162 };
1163 MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
1164 #endif
1165
1166 static struct platform_driver bq27xxx_battery_platform_driver = {
1167         .probe  = bq27xxx_battery_platform_probe,
1168         .remove = bq27xxx_battery_platform_remove,
1169         .driver = {
1170                 .name = "bq27000-battery",
1171                 .of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
1172         },
1173         .id_table = bq27xxx_battery_platform_id_table,
1174 };
1175 module_platform_driver(bq27xxx_battery_platform_driver);
1176
1177 MODULE_ALIAS("platform:bq27000-battery");
1178
1179 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1180 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1181 MODULE_LICENSE("GPL");