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  * Copyright (C) 2017 Liam Breck <kernel@networkimprov.net>
   9  *
  10  * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
  11  *
  12  * This package is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  *
  16  * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  18  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  19  *
  20  * Datasheets:
  21  * http://www.ti.com/product/bq27000
  22  * http://www.ti.com/product/bq27200
  23  * http://www.ti.com/product/bq27010
  24  * http://www.ti.com/product/bq27210
  25  * http://www.ti.com/product/bq27500
  26  * http://www.ti.com/product/bq27510-g1
  27  * http://www.ti.com/product/bq27510-g2
  28  * http://www.ti.com/product/bq27510-g3
  29  * http://www.ti.com/product/bq27520-g4
  30  * http://www.ti.com/product/bq27520-g1
  31  * http://www.ti.com/product/bq27520-g2
  32  * http://www.ti.com/product/bq27520-g3
  33  * http://www.ti.com/product/bq27520-g4
  34  * http://www.ti.com/product/bq27530-g1
  35  * http://www.ti.com/product/bq27531-g1
  36  * http://www.ti.com/product/bq27541-g1
  37  * http://www.ti.com/product/bq27542-g1
  38  * http://www.ti.com/product/bq27546-g1
  39  * http://www.ti.com/product/bq27742-g1
  40  * http://www.ti.com/product/bq27545-g1
  41  * http://www.ti.com/product/bq27421-g1
  42  * http://www.ti.com/product/bq27425-g1
  43  * http://www.ti.com/product/bq27411-g1
  44  * http://www.ti.com/product/bq27621-g1
  45  */
  46
  47 #include <linux/device.h>
  48 #include <linux/module.h>
  49 #include <linux/mutex.h>
  50 #include <linux/param.h>
  51 #include <linux/jiffies.h>
  52 #include <linux/workqueue.h>
  53 #include <linux/delay.h>
  54 #include <linux/platform_device.h>
  55 #include <linux/power_supply.h>
  56 #include <linux/slab.h>
  57 #include <linux/of.h>
  58
  59 #include <linux/power/bq27xxx_battery.h>
  60
  61 #define BQ27XXX_MANUFACTURER    "Texas Instruments"
  62
  63 /* BQ27XXX Flags */
  64 #define BQ27XXX_FLAG_DSC        BIT(0)
  65 #define BQ27XXX_FLAG_SOCF       BIT(1) /* State-of-Charge threshold final */
  66 #define BQ27XXX_FLAG_SOC1       BIT(2) /* State-of-Charge threshold 1 */
  67 #define BQ27XXX_FLAG_CFGUP      BIT(4)
  68 #define BQ27XXX_FLAG_FC         BIT(9)
  69 #define BQ27XXX_FLAG_OTD        BIT(14)
  70 #define BQ27XXX_FLAG_OTC        BIT(15)
  71 #define BQ27XXX_FLAG_UT         BIT(14)
  72 #define BQ27XXX_FLAG_OT         BIT(15)
  73
  74 /* BQ27000 has different layout for Flags register */
  75 #define BQ27000_FLAG_EDVF       BIT(0) /* Final End-of-Discharge-Voltage flag */
  76 #define BQ27000_FLAG_EDV1       BIT(1) /* First End-of-Discharge-Voltage flag */
  77 #define BQ27000_FLAG_CI         BIT(4) /* Capacity Inaccurate flag */
  78 #define BQ27000_FLAG_FC         BIT(5)
  79 #define BQ27000_FLAG_CHGS       BIT(7) /* Charge state flag */
  80
  81 /* control register params */
  82 #define BQ27XXX_SEALED                  0x20
  83 #define BQ27XXX_SET_CFGUPDATE           0x13
  84 #define BQ27XXX_SOFT_RESET              0x42
  85 #define BQ27XXX_RESET                   0x41
  86
  87 #define BQ27XXX_RS                      (20) /* Resistor sense mOhm */
  88 #define BQ27XXX_POWER_CONSTANT          (29200) /* 29.2 µV^2 * 1000 */
  89 #define BQ27XXX_CURRENT_CONSTANT        (3570) /* 3.57 µV * 1000 */
  90
  91 #define INVALID_REG_ADDR        0xff
  92
  93 /*
  94  * bq27xxx_reg_index - Register names
  95  *
  96  * These are indexes into a device's register mapping array.
  97  */
  98
  99 enum bq27xxx_reg_index {
 100         BQ27XXX_REG_CTRL = 0,   /* Control */
 101         BQ27XXX_REG_TEMP,       /* Temperature */
 102         BQ27XXX_REG_INT_TEMP,   /* Internal Temperature */
 103         BQ27XXX_REG_VOLT,       /* Voltage */
 104         BQ27XXX_REG_AI,         /* Average Current */
 105         BQ27XXX_REG_FLAGS,      /* Flags */
 106         BQ27XXX_REG_TTE,        /* Time-to-Empty */
 107         BQ27XXX_REG_TTF,        /* Time-to-Full */
 108         BQ27XXX_REG_TTES,       /* Time-to-Empty Standby */
 109         BQ27XXX_REG_TTECP,      /* Time-to-Empty at Constant Power */
 110         BQ27XXX_REG_NAC,        /* Nominal Available Capacity */
 111         BQ27XXX_REG_FCC,        /* Full Charge Capacity */
 112         BQ27XXX_REG_CYCT,       /* Cycle Count */
 113         BQ27XXX_REG_AE,         /* Available Energy */
 114         BQ27XXX_REG_SOC,        /* State-of-Charge */
 115         BQ27XXX_REG_DCAP,       /* Design Capacity */
 116         BQ27XXX_REG_AP,         /* Average Power */
 117         BQ27XXX_DM_CTRL,        /* Block Data Control */
 118         BQ27XXX_DM_CLASS,       /* Data Class */
 119         BQ27XXX_DM_BLOCK,       /* Data Block */
 120         BQ27XXX_DM_DATA,        /* Block Data */
 121         BQ27XXX_DM_CKSUM,       /* Block Data Checksum */
 122         BQ27XXX_REG_MAX,        /* sentinel */
 123 };
 124
 125 #define BQ27XXX_DM_REG_ROWS \
 126         [BQ27XXX_DM_CTRL] = 0x61,  \
 127         [BQ27XXX_DM_CLASS] = 0x3e, \
 128         [BQ27XXX_DM_BLOCK] = 0x3f, \
 129         [BQ27XXX_DM_DATA] = 0x40,  \
 130         [BQ27XXX_DM_CKSUM] = 0x60
 131
 132 /* Register mappings */
 133 static u8
 134         bq27000_regs[BQ27XXX_REG_MAX] = {
 135                 [BQ27XXX_REG_CTRL] = 0x00,
 136                 [BQ27XXX_REG_TEMP] = 0x06,
 137                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 138                 [BQ27XXX_REG_VOLT] = 0x08,
 139                 [BQ27XXX_REG_AI] = 0x14,
 140                 [BQ27XXX_REG_FLAGS] = 0x0a,
 141                 [BQ27XXX_REG_TTE] = 0x16,
 142                 [BQ27XXX_REG_TTF] = 0x18,
 143                 [BQ27XXX_REG_TTES] = 0x1c,
 144                 [BQ27XXX_REG_TTECP] = 0x26,
 145                 [BQ27XXX_REG_NAC] = 0x0c,
 146                 [BQ27XXX_REG_FCC] = 0x12,
 147                 [BQ27XXX_REG_CYCT] = 0x2a,
 148                 [BQ27XXX_REG_AE] = 0x22,
 149                 [BQ27XXX_REG_SOC] = 0x0b,
 150                 [BQ27XXX_REG_DCAP] = 0x76,
 151                 [BQ27XXX_REG_AP] = 0x24,
 152                 [BQ27XXX_DM_CTRL] = INVALID_REG_ADDR,
 153                 [BQ27XXX_DM_CLASS] = INVALID_REG_ADDR,
 154                 [BQ27XXX_DM_BLOCK] = INVALID_REG_ADDR,
 155                 [BQ27XXX_DM_DATA] = INVALID_REG_ADDR,
 156                 [BQ27XXX_DM_CKSUM] = INVALID_REG_ADDR,
 157         },
 158         bq27010_regs[BQ27XXX_REG_MAX] = {
 159                 [BQ27XXX_REG_CTRL] = 0x00,
 160                 [BQ27XXX_REG_TEMP] = 0x06,
 161                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 162                 [BQ27XXX_REG_VOLT] = 0x08,
 163                 [BQ27XXX_REG_AI] = 0x14,
 164                 [BQ27XXX_REG_FLAGS] = 0x0a,
 165                 [BQ27XXX_REG_TTE] = 0x16,
 166                 [BQ27XXX_REG_TTF] = 0x18,
 167                 [BQ27XXX_REG_TTES] = 0x1c,
 168                 [BQ27XXX_REG_TTECP] = 0x26,
 169                 [BQ27XXX_REG_NAC] = 0x0c,
 170                 [BQ27XXX_REG_FCC] = 0x12,
 171                 [BQ27XXX_REG_CYCT] = 0x2a,
 172                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 173                 [BQ27XXX_REG_SOC] = 0x0b,
 174                 [BQ27XXX_REG_DCAP] = 0x76,
 175                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 176                 [BQ27XXX_DM_CTRL] = INVALID_REG_ADDR,
 177                 [BQ27XXX_DM_CLASS] = INVALID_REG_ADDR,
 178                 [BQ27XXX_DM_BLOCK] = INVALID_REG_ADDR,
 179                 [BQ27XXX_DM_DATA] = INVALID_REG_ADDR,
 180                 [BQ27XXX_DM_CKSUM] = INVALID_REG_ADDR,
 181         },
 182         bq2750x_regs[BQ27XXX_REG_MAX] = {
 183                 [BQ27XXX_REG_CTRL] = 0x00,
 184                 [BQ27XXX_REG_TEMP] = 0x06,
 185                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 186                 [BQ27XXX_REG_VOLT] = 0x08,
 187                 [BQ27XXX_REG_AI] = 0x14,
 188                 [BQ27XXX_REG_FLAGS] = 0x0a,
 189                 [BQ27XXX_REG_TTE] = 0x16,
 190                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 191                 [BQ27XXX_REG_TTES] = 0x1a,
 192                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 193                 [BQ27XXX_REG_NAC] = 0x0c,
 194                 [BQ27XXX_REG_FCC] = 0x12,
 195                 [BQ27XXX_REG_CYCT] = 0x2a,
 196                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 197                 [BQ27XXX_REG_SOC] = 0x2c,
 198                 [BQ27XXX_REG_DCAP] = 0x3c,
 199                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 200                 BQ27XXX_DM_REG_ROWS,
 201         },
 202 #define bq2751x_regs bq27510g3_regs
 203 #define bq2752x_regs bq27510g3_regs
 204         bq27500_regs[BQ27XXX_REG_MAX] = {
 205                 [BQ27XXX_REG_CTRL] = 0x00,
 206                 [BQ27XXX_REG_TEMP] = 0x06,
 207                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 208                 [BQ27XXX_REG_VOLT] = 0x08,
 209                 [BQ27XXX_REG_AI] = 0x14,
 210                 [BQ27XXX_REG_FLAGS] = 0x0a,
 211                 [BQ27XXX_REG_TTE] = 0x16,
 212                 [BQ27XXX_REG_TTF] = 0x18,
 213                 [BQ27XXX_REG_TTES] = 0x1c,
 214                 [BQ27XXX_REG_TTECP] = 0x26,
 215                 [BQ27XXX_REG_NAC] = 0x0c,
 216                 [BQ27XXX_REG_FCC] = 0x12,
 217                 [BQ27XXX_REG_CYCT] = 0x2a,
 218                 [BQ27XXX_REG_AE] = 0x22,
 219                 [BQ27XXX_REG_SOC] = 0x2c,
 220                 [BQ27XXX_REG_DCAP] = 0x3c,
 221                 [BQ27XXX_REG_AP] = 0x24,
 222                 BQ27XXX_DM_REG_ROWS,
 223         },
 224 #define bq27510g1_regs bq27500_regs
 225 #define bq27510g2_regs bq27500_regs
 226         bq27510g3_regs[BQ27XXX_REG_MAX] = {
 227                 [BQ27XXX_REG_CTRL] = 0x00,
 228                 [BQ27XXX_REG_TEMP] = 0x06,
 229                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 230                 [BQ27XXX_REG_VOLT] = 0x08,
 231                 [BQ27XXX_REG_AI] = 0x14,
 232                 [BQ27XXX_REG_FLAGS] = 0x0a,
 233                 [BQ27XXX_REG_TTE] = 0x16,
 234                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 235                 [BQ27XXX_REG_TTES] = 0x1a,
 236                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 237                 [BQ27XXX_REG_NAC] = 0x0c,
 238                 [BQ27XXX_REG_FCC] = 0x12,
 239                 [BQ27XXX_REG_CYCT] = 0x1e,
 240                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 241                 [BQ27XXX_REG_SOC] = 0x20,
 242                 [BQ27XXX_REG_DCAP] = 0x2e,
 243                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 244                 BQ27XXX_DM_REG_ROWS,
 245         },
 246         bq27520g1_regs[BQ27XXX_REG_MAX] = {
 247                 [BQ27XXX_REG_CTRL] = 0x00,
 248                 [BQ27XXX_REG_TEMP] = 0x06,
 249                 [BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
 250                 [BQ27XXX_REG_VOLT] = 0x08,
 251                 [BQ27XXX_REG_AI] = 0x14,
 252                 [BQ27XXX_REG_FLAGS] = 0x0a,
 253                 [BQ27XXX_REG_TTE] = 0x16,
 254                 [BQ27XXX_REG_TTF] = 0x18,
 255                 [BQ27XXX_REG_TTES] = 0x1c,
 256                 [BQ27XXX_REG_TTECP] = 0x26,
 257                 [BQ27XXX_REG_NAC] = 0x0c,
 258                 [BQ27XXX_REG_FCC] = 0x12,
 259                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 260                 [BQ27XXX_REG_AE] = 0x22,
 261                 [BQ27XXX_REG_SOC] = 0x2c,
 262                 [BQ27XXX_REG_DCAP] = 0x3c,
 263                 [BQ27XXX_REG_AP] = 0x24,
 264                 BQ27XXX_DM_REG_ROWS,
 265         },
 266         bq27520g2_regs[BQ27XXX_REG_MAX] = {
 267                 [BQ27XXX_REG_CTRL] = 0x00,
 268                 [BQ27XXX_REG_TEMP] = 0x06,
 269                 [BQ27XXX_REG_INT_TEMP] = 0x36,
 270                 [BQ27XXX_REG_VOLT] = 0x08,
 271                 [BQ27XXX_REG_AI] = 0x14,
 272                 [BQ27XXX_REG_FLAGS] = 0x0a,
 273                 [BQ27XXX_REG_TTE] = 0x16,
 274                 [BQ27XXX_REG_TTF] = 0x18,
 275                 [BQ27XXX_REG_TTES] = 0x1c,
 276                 [BQ27XXX_REG_TTECP] = 0x26,
 277                 [BQ27XXX_REG_NAC] = 0x0c,
 278                 [BQ27XXX_REG_FCC] = 0x12,
 279                 [BQ27XXX_REG_CYCT] = 0x2a,
 280                 [BQ27XXX_REG_AE] = 0x22,
 281                 [BQ27XXX_REG_SOC] = 0x2c,
 282                 [BQ27XXX_REG_DCAP] = 0x3c,
 283                 [BQ27XXX_REG_AP] = 0x24,
 284                 BQ27XXX_DM_REG_ROWS,
 285         },
 286         bq27520g3_regs[BQ27XXX_REG_MAX] = {
 287                 [BQ27XXX_REG_CTRL] = 0x00,
 288                 [BQ27XXX_REG_TEMP] = 0x06,
 289                 [BQ27XXX_REG_INT_TEMP] = 0x36,
 290                 [BQ27XXX_REG_VOLT] = 0x08,
 291                 [BQ27XXX_REG_AI] = 0x14,
 292                 [BQ27XXX_REG_FLAGS] = 0x0a,
 293                 [BQ27XXX_REG_TTE] = 0x16,
 294                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 295                 [BQ27XXX_REG_TTES] = 0x1c,
 296                 [BQ27XXX_REG_TTECP] = 0x26,
 297                 [BQ27XXX_REG_NAC] = 0x0c,
 298                 [BQ27XXX_REG_FCC] = 0x12,
 299                 [BQ27XXX_REG_CYCT] = 0x2a,
 300                 [BQ27XXX_REG_AE] = 0x22,
 301                 [BQ27XXX_REG_SOC] = 0x2c,
 302                 [BQ27XXX_REG_DCAP] = 0x3c,
 303                 [BQ27XXX_REG_AP] = 0x24,
 304                 BQ27XXX_DM_REG_ROWS,
 305         },
 306         bq27520g4_regs[BQ27XXX_REG_MAX] = {
 307                 [BQ27XXX_REG_CTRL] = 0x00,
 308                 [BQ27XXX_REG_TEMP] = 0x06,
 309                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 310                 [BQ27XXX_REG_VOLT] = 0x08,
 311                 [BQ27XXX_REG_AI] = 0x14,
 312                 [BQ27XXX_REG_FLAGS] = 0x0a,
 313                 [BQ27XXX_REG_TTE] = 0x16,
 314                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 315                 [BQ27XXX_REG_TTES] = 0x1c,
 316                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 317                 [BQ27XXX_REG_NAC] = 0x0c,
 318                 [BQ27XXX_REG_FCC] = 0x12,
 319                 [BQ27XXX_REG_CYCT] = 0x1e,
 320                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 321                 [BQ27XXX_REG_SOC] = 0x20,
 322                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 323                 [BQ27XXX_REG_AP] = INVALID_REG_ADDR,
 324                 BQ27XXX_DM_REG_ROWS,
 325         },
 326         bq27530_regs[BQ27XXX_REG_MAX] = {
 327                 [BQ27XXX_REG_CTRL] = 0x00,
 328                 [BQ27XXX_REG_TEMP] = 0x06,
 329                 [BQ27XXX_REG_INT_TEMP] = 0x32,
 330                 [BQ27XXX_REG_VOLT] = 0x08,
 331                 [BQ27XXX_REG_AI] = 0x14,
 332                 [BQ27XXX_REG_FLAGS] = 0x0a,
 333                 [BQ27XXX_REG_TTE] = 0x16,
 334                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 335                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 336                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 337                 [BQ27XXX_REG_NAC] = 0x0c,
 338                 [BQ27XXX_REG_FCC] = 0x12,
 339                 [BQ27XXX_REG_CYCT] = 0x2a,
 340                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 341                 [BQ27XXX_REG_SOC] = 0x2c,
 342                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 343                 [BQ27XXX_REG_AP] = 0x24,
 344                 BQ27XXX_DM_REG_ROWS,
 345         },
 346 #define bq27531_regs bq27530_regs
 347         bq27541_regs[BQ27XXX_REG_MAX] = {
 348                 [BQ27XXX_REG_CTRL] = 0x00,
 349                 [BQ27XXX_REG_TEMP] = 0x06,
 350                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 351                 [BQ27XXX_REG_VOLT] = 0x08,
 352                 [BQ27XXX_REG_AI] = 0x14,
 353                 [BQ27XXX_REG_FLAGS] = 0x0a,
 354                 [BQ27XXX_REG_TTE] = 0x16,
 355                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 356                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 357                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 358                 [BQ27XXX_REG_NAC] = 0x0c,
 359                 [BQ27XXX_REG_FCC] = 0x12,
 360                 [BQ27XXX_REG_CYCT] = 0x2a,
 361                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 362                 [BQ27XXX_REG_SOC] = 0x2c,
 363                 [BQ27XXX_REG_DCAP] = 0x3c,
 364                 [BQ27XXX_REG_AP] = 0x24,
 365                 BQ27XXX_DM_REG_ROWS,
 366         },
 367 #define bq27542_regs bq27541_regs
 368 #define bq27546_regs bq27541_regs
 369 #define bq27742_regs bq27541_regs
 370         bq27545_regs[BQ27XXX_REG_MAX] = {
 371                 [BQ27XXX_REG_CTRL] = 0x00,
 372                 [BQ27XXX_REG_TEMP] = 0x06,
 373                 [BQ27XXX_REG_INT_TEMP] = 0x28,
 374                 [BQ27XXX_REG_VOLT] = 0x08,
 375                 [BQ27XXX_REG_AI] = 0x14,
 376                 [BQ27XXX_REG_FLAGS] = 0x0a,
 377                 [BQ27XXX_REG_TTE] = 0x16,
 378                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 379                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 380                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 381                 [BQ27XXX_REG_NAC] = 0x0c,
 382                 [BQ27XXX_REG_FCC] = 0x12,
 383                 [BQ27XXX_REG_CYCT] = 0x2a,
 384                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 385                 [BQ27XXX_REG_SOC] = 0x2c,
 386                 [BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
 387                 [BQ27XXX_REG_AP] = 0x24,
 388                 BQ27XXX_DM_REG_ROWS,
 389         },
 390         bq27421_regs[BQ27XXX_REG_MAX] = {
 391                 [BQ27XXX_REG_CTRL] = 0x00,
 392                 [BQ27XXX_REG_TEMP] = 0x02,
 393                 [BQ27XXX_REG_INT_TEMP] = 0x1e,
 394                 [BQ27XXX_REG_VOLT] = 0x04,
 395                 [BQ27XXX_REG_AI] = 0x10,
 396                 [BQ27XXX_REG_FLAGS] = 0x06,
 397                 [BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
 398                 [BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
 399                 [BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
 400                 [BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
 401                 [BQ27XXX_REG_NAC] = 0x08,
 402                 [BQ27XXX_REG_FCC] = 0x0e,
 403                 [BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
 404                 [BQ27XXX_REG_AE] = INVALID_REG_ADDR,
 405                 [BQ27XXX_REG_SOC] = 0x1c,
 406                 [BQ27XXX_REG_DCAP] = 0x3c,
 407                 [BQ27XXX_REG_AP] = 0x18,
 408                 BQ27XXX_DM_REG_ROWS,
 409         };
 410 #define bq27425_regs bq27421_regs
 411 #define bq27441_regs bq27421_regs
 412 #define bq27621_regs bq27421_regs
 413
 414 static enum power_supply_property bq27000_props[] = {
 415         POWER_SUPPLY_PROP_STATUS,
 416         POWER_SUPPLY_PROP_PRESENT,
 417         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 418         POWER_SUPPLY_PROP_CURRENT_NOW,
 419         POWER_SUPPLY_PROP_CAPACITY,
 420         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 421         POWER_SUPPLY_PROP_TEMP,
 422         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 423         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 424         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 425         POWER_SUPPLY_PROP_TECHNOLOGY,
 426         POWER_SUPPLY_PROP_CHARGE_FULL,
 427         POWER_SUPPLY_PROP_CHARGE_NOW,
 428         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 429         POWER_SUPPLY_PROP_CYCLE_COUNT,
 430         POWER_SUPPLY_PROP_ENERGY_NOW,
 431         POWER_SUPPLY_PROP_POWER_AVG,
 432         POWER_SUPPLY_PROP_HEALTH,
 433         POWER_SUPPLY_PROP_MANUFACTURER,
 434 };
 435
 436 static enum power_supply_property bq27010_props[] = {
 437         POWER_SUPPLY_PROP_STATUS,
 438         POWER_SUPPLY_PROP_PRESENT,
 439         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 440         POWER_SUPPLY_PROP_CURRENT_NOW,
 441         POWER_SUPPLY_PROP_CAPACITY,
 442         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 443         POWER_SUPPLY_PROP_TEMP,
 444         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 445         POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
 446         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 447         POWER_SUPPLY_PROP_TECHNOLOGY,
 448         POWER_SUPPLY_PROP_CHARGE_FULL,
 449         POWER_SUPPLY_PROP_CHARGE_NOW,
 450         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 451         POWER_SUPPLY_PROP_CYCLE_COUNT,
 452         POWER_SUPPLY_PROP_HEALTH,
 453         POWER_SUPPLY_PROP_MANUFACTURER,
 454 };
 455
 456 #define bq2750x_props bq27510g3_props
 457 #define bq2751x_props bq27510g3_props
 458 #define bq2752x_props bq27510g3_props
 459
 460 static enum power_supply_property bq27500_props[] = {
 461         POWER_SUPPLY_PROP_STATUS,
 462         POWER_SUPPLY_PROP_PRESENT,
 463         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 464         POWER_SUPPLY_PROP_CURRENT_NOW,
 465         POWER_SUPPLY_PROP_CAPACITY,
 466         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 467         POWER_SUPPLY_PROP_TEMP,
 468         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 469         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 470         POWER_SUPPLY_PROP_TECHNOLOGY,
 471         POWER_SUPPLY_PROP_CHARGE_FULL,
 472         POWER_SUPPLY_PROP_CHARGE_NOW,
 473         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 474         POWER_SUPPLY_PROP_CYCLE_COUNT,
 475         POWER_SUPPLY_PROP_ENERGY_NOW,
 476         POWER_SUPPLY_PROP_POWER_AVG,
 477         POWER_SUPPLY_PROP_HEALTH,
 478         POWER_SUPPLY_PROP_MANUFACTURER,
 479 };
 480 #define bq27510g1_props bq27500_props
 481 #define bq27510g2_props bq27500_props
 482
 483 static enum power_supply_property bq27510g3_props[] = {
 484         POWER_SUPPLY_PROP_STATUS,
 485         POWER_SUPPLY_PROP_PRESENT,
 486         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 487         POWER_SUPPLY_PROP_CURRENT_NOW,
 488         POWER_SUPPLY_PROP_CAPACITY,
 489         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 490         POWER_SUPPLY_PROP_TEMP,
 491         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 492         POWER_SUPPLY_PROP_TECHNOLOGY,
 493         POWER_SUPPLY_PROP_CHARGE_FULL,
 494         POWER_SUPPLY_PROP_CHARGE_NOW,
 495         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 496         POWER_SUPPLY_PROP_CYCLE_COUNT,
 497         POWER_SUPPLY_PROP_HEALTH,
 498         POWER_SUPPLY_PROP_MANUFACTURER,
 499 };
 500
 501 static enum power_supply_property bq27520g1_props[] = {
 502         POWER_SUPPLY_PROP_STATUS,
 503         POWER_SUPPLY_PROP_PRESENT,
 504         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 505         POWER_SUPPLY_PROP_CURRENT_NOW,
 506         POWER_SUPPLY_PROP_CAPACITY,
 507         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 508         POWER_SUPPLY_PROP_TEMP,
 509         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 510         POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
 511         POWER_SUPPLY_PROP_TECHNOLOGY,
 512         POWER_SUPPLY_PROP_CHARGE_FULL,
 513         POWER_SUPPLY_PROP_CHARGE_NOW,
 514         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 515         POWER_SUPPLY_PROP_ENERGY_NOW,
 516         POWER_SUPPLY_PROP_POWER_AVG,
 517         POWER_SUPPLY_PROP_HEALTH,
 518         POWER_SUPPLY_PROP_MANUFACTURER,
 519 };
 520
 521 #define bq27520g2_props bq27500_props
 522
 523 static enum power_supply_property bq27520g3_props[] = {
 524         POWER_SUPPLY_PROP_STATUS,
 525         POWER_SUPPLY_PROP_PRESENT,
 526         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 527         POWER_SUPPLY_PROP_CURRENT_NOW,
 528         POWER_SUPPLY_PROP_CAPACITY,
 529         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 530         POWER_SUPPLY_PROP_TEMP,
 531         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 532         POWER_SUPPLY_PROP_TECHNOLOGY,
 533         POWER_SUPPLY_PROP_CHARGE_FULL,
 534         POWER_SUPPLY_PROP_CHARGE_NOW,
 535         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 536         POWER_SUPPLY_PROP_CYCLE_COUNT,
 537         POWER_SUPPLY_PROP_ENERGY_NOW,
 538         POWER_SUPPLY_PROP_POWER_AVG,
 539         POWER_SUPPLY_PROP_HEALTH,
 540         POWER_SUPPLY_PROP_MANUFACTURER,
 541 };
 542
 543 static enum power_supply_property bq27520g4_props[] = {
 544         POWER_SUPPLY_PROP_STATUS,
 545         POWER_SUPPLY_PROP_PRESENT,
 546         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 547         POWER_SUPPLY_PROP_CURRENT_NOW,
 548         POWER_SUPPLY_PROP_CAPACITY,
 549         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 550         POWER_SUPPLY_PROP_TEMP,
 551         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 552         POWER_SUPPLY_PROP_TECHNOLOGY,
 553         POWER_SUPPLY_PROP_CHARGE_FULL,
 554         POWER_SUPPLY_PROP_CHARGE_NOW,
 555         POWER_SUPPLY_PROP_CYCLE_COUNT,
 556         POWER_SUPPLY_PROP_HEALTH,
 557         POWER_SUPPLY_PROP_MANUFACTURER,
 558 };
 559
 560 static enum power_supply_property bq27530_props[] = {
 561         POWER_SUPPLY_PROP_STATUS,
 562         POWER_SUPPLY_PROP_PRESENT,
 563         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 564         POWER_SUPPLY_PROP_CURRENT_NOW,
 565         POWER_SUPPLY_PROP_CAPACITY,
 566         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 567         POWER_SUPPLY_PROP_TEMP,
 568         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 569         POWER_SUPPLY_PROP_TECHNOLOGY,
 570         POWER_SUPPLY_PROP_CHARGE_FULL,
 571         POWER_SUPPLY_PROP_CHARGE_NOW,
 572         POWER_SUPPLY_PROP_POWER_AVG,
 573         POWER_SUPPLY_PROP_HEALTH,
 574         POWER_SUPPLY_PROP_CYCLE_COUNT,
 575         POWER_SUPPLY_PROP_MANUFACTURER,
 576 };
 577 #define bq27531_props bq27530_props
 578
 579 static enum power_supply_property bq27541_props[] = {
 580         POWER_SUPPLY_PROP_STATUS,
 581         POWER_SUPPLY_PROP_PRESENT,
 582         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 583         POWER_SUPPLY_PROP_CURRENT_NOW,
 584         POWER_SUPPLY_PROP_CAPACITY,
 585         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 586         POWER_SUPPLY_PROP_TEMP,
 587         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 588         POWER_SUPPLY_PROP_TECHNOLOGY,
 589         POWER_SUPPLY_PROP_CHARGE_FULL,
 590         POWER_SUPPLY_PROP_CHARGE_NOW,
 591         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 592         POWER_SUPPLY_PROP_CYCLE_COUNT,
 593         POWER_SUPPLY_PROP_POWER_AVG,
 594         POWER_SUPPLY_PROP_HEALTH,
 595         POWER_SUPPLY_PROP_MANUFACTURER,
 596 };
 597 #define bq27542_props bq27541_props
 598 #define bq27546_props bq27541_props
 599 #define bq27742_props bq27541_props
 600
 601 static enum power_supply_property bq27545_props[] = {
 602         POWER_SUPPLY_PROP_STATUS,
 603         POWER_SUPPLY_PROP_PRESENT,
 604         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 605         POWER_SUPPLY_PROP_CURRENT_NOW,
 606         POWER_SUPPLY_PROP_CAPACITY,
 607         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 608         POWER_SUPPLY_PROP_TEMP,
 609         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 610         POWER_SUPPLY_PROP_TECHNOLOGY,
 611         POWER_SUPPLY_PROP_CHARGE_FULL,
 612         POWER_SUPPLY_PROP_CHARGE_NOW,
 613         POWER_SUPPLY_PROP_HEALTH,
 614         POWER_SUPPLY_PROP_CYCLE_COUNT,
 615         POWER_SUPPLY_PROP_POWER_AVG,
 616         POWER_SUPPLY_PROP_MANUFACTURER,
 617 };
 618
 619 static enum power_supply_property bq27421_props[] = {
 620         POWER_SUPPLY_PROP_STATUS,
 621         POWER_SUPPLY_PROP_PRESENT,
 622         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 623         POWER_SUPPLY_PROP_CURRENT_NOW,
 624         POWER_SUPPLY_PROP_CAPACITY,
 625         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 626         POWER_SUPPLY_PROP_TEMP,
 627         POWER_SUPPLY_PROP_TECHNOLOGY,
 628         POWER_SUPPLY_PROP_CHARGE_FULL,
 629         POWER_SUPPLY_PROP_CHARGE_NOW,
 630         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 631         POWER_SUPPLY_PROP_MANUFACTURER,
 632 };
 633 #define bq27425_props bq27421_props
 634 #define bq27441_props bq27421_props
 635 #define bq27621_props bq27421_props
 636
 637 struct bq27xxx_dm_reg {
 638         u8 subclass_id;
 639         u8 offset;
 640         u8 bytes;
 641         u16 min, max;
 642 };
 643
 644 enum bq27xxx_dm_reg_id {
 645         BQ27XXX_DM_DESIGN_CAPACITY = 0,
 646         BQ27XXX_DM_DESIGN_ENERGY,
 647         BQ27XXX_DM_TERMINATE_VOLTAGE,
 648 };
 649
 650 #define bq27000_dm_regs 0
 651 #define bq27010_dm_regs 0
 652 #define bq2750x_dm_regs 0
 653 #define bq2751x_dm_regs 0
 654 #define bq2752x_dm_regs 0
 655
 656 #if 0 /* not yet tested */
 657 static struct bq27xxx_dm_reg bq27500_dm_regs[] = {
 658         [BQ27XXX_DM_DESIGN_CAPACITY]   = { 48, 10, 2,    0, 65535 },
 659         [BQ27XXX_DM_DESIGN_ENERGY]     = { }, /* missing on chip */
 660         [BQ27XXX_DM_TERMINATE_VOLTAGE] = { 80, 48, 2, 1000, 32767 },
 661 };
 662 #else
 663 #define bq27500_dm_regs 0
 664 #endif
 665
 666 /* todo create data memory definitions from datasheets and test on chips */
 667 #define bq27510g1_dm_regs 0
 668 #define bq27510g2_dm_regs 0
 669 #define bq27510g3_dm_regs 0
 670 #define bq27520g1_dm_regs 0
 671 #define bq27520g2_dm_regs 0
 672 #define bq27520g3_dm_regs 0
 673 #define bq27520g4_dm_regs 0
 674 #define bq27530_dm_regs 0
 675 #define bq27531_dm_regs 0
 676 #define bq27541_dm_regs 0
 677 #define bq27542_dm_regs 0
 678 #define bq27546_dm_regs 0
 679 #define bq27742_dm_regs 0
 680
 681 #if 0 /* not yet tested */
 682 static struct bq27xxx_dm_reg bq27545_dm_regs[] = {
 683         [BQ27XXX_DM_DESIGN_CAPACITY]   = { 48, 23, 2,    0, 32767 },
 684         [BQ27XXX_DM_DESIGN_ENERGY]     = { 48, 25, 2,    0, 32767 },
 685         [BQ27XXX_DM_TERMINATE_VOLTAGE] = { 80, 67, 2, 2800,  3700 },
 686 };
 687 #else
 688 #define bq27545_dm_regs 0
 689 #endif
 690
 691 static struct bq27xxx_dm_reg bq27421_dm_regs[] = {
 692         [BQ27XXX_DM_DESIGN_CAPACITY]   = { 82, 10, 2,    0,  8000 },
 693         [BQ27XXX_DM_DESIGN_ENERGY]     = { 82, 12, 2,    0, 32767 },
 694         [BQ27XXX_DM_TERMINATE_VOLTAGE] = { 82, 16, 2, 2500,  3700 },
 695 };
 696
 697 static struct bq27xxx_dm_reg bq27425_dm_regs[] = {
 698         [BQ27XXX_DM_DESIGN_CAPACITY]   = { 82, 12, 2,    0, 32767 },
 699         [BQ27XXX_DM_DESIGN_ENERGY]     = { 82, 14, 2,    0, 32767 },
 700         [BQ27XXX_DM_TERMINATE_VOLTAGE] = { 82, 18, 2, 2800,  3700 },
 701 };
 702
 703 #if 0 /* not yet tested */
 704 #define bq27441_dm_regs bq27421_dm_regs
 705 #else
 706 #define bq27441_dm_regs 0
 707 #endif
 708
 709 #if 0 /* not yet tested */
 710 static struct bq27xxx_dm_reg bq27621_dm_regs[] = {
 711         [BQ27XXX_DM_DESIGN_CAPACITY]   = { 82, 3, 2,    0,  8000 },
 712         [BQ27XXX_DM_DESIGN_ENERGY]     = { 82, 5, 2,    0, 32767 },
 713         [BQ27XXX_DM_TERMINATE_VOLTAGE] = { 82, 9, 2, 2500,  3700 },
 714 };
 715 #else
 716 #define bq27621_dm_regs 0
 717 #endif
 718
 719 #define BQ27XXX_O_ZERO  0x00000001
 720 #define BQ27XXX_O_OTDC  0x00000002
 721 #define BQ27XXX_O_UTOT  0x00000004
 722 #define BQ27XXX_O_CFGUP 0x00000008
 723 #define BQ27XXX_O_RAM   0x00000010
 724
 725 #define BQ27XXX_DATA(ref, key, opt) {           \
 726         .opts = (opt),                          \
 727         .unseal_key = key,                      \
 728         .regs  = ref##_regs,                    \
 729         .dm_regs = ref##_dm_regs,               \
 730         .props = ref##_props,                   \
 731         .props_size = ARRAY_SIZE(ref##_props) }
 732
 733 static struct {
 734         u32 opts;
 735         u32 unseal_key;
 736         u8 *regs;
 737         struct bq27xxx_dm_reg *dm_regs;
 738         enum power_supply_property *props;
 739         size_t props_size;
 740 } bq27xxx_chip_data[] = {
 741         [BQ27000]   = BQ27XXX_DATA(bq27000,   0         , BQ27XXX_O_ZERO),
 742         [BQ27010]   = BQ27XXX_DATA(bq27010,   0         , BQ27XXX_O_ZERO),
 743         [BQ2750X]   = BQ27XXX_DATA(bq2750x,   0         , BQ27XXX_O_OTDC),
 744         [BQ2751X]   = BQ27XXX_DATA(bq2751x,   0         , BQ27XXX_O_OTDC),
 745         [BQ2752X]   = BQ27XXX_DATA(bq2752x,   0         , BQ27XXX_O_OTDC),
 746         [BQ27500]   = BQ27XXX_DATA(bq27500,   0x04143672, BQ27XXX_O_OTDC),
 747         [BQ27510G1] = BQ27XXX_DATA(bq27510g1, 0         , BQ27XXX_O_OTDC),
 748         [BQ27510G2] = BQ27XXX_DATA(bq27510g2, 0         , BQ27XXX_O_OTDC),
 749         [BQ27510G3] = BQ27XXX_DATA(bq27510g3, 0         , BQ27XXX_O_OTDC),
 750         [BQ27520G1] = BQ27XXX_DATA(bq27520g1, 0         , BQ27XXX_O_OTDC),
 751         [BQ27520G2] = BQ27XXX_DATA(bq27520g2, 0         , BQ27XXX_O_OTDC),
 752         [BQ27520G3] = BQ27XXX_DATA(bq27520g3, 0         , BQ27XXX_O_OTDC),
 753         [BQ27520G4] = BQ27XXX_DATA(bq27520g4, 0         , BQ27XXX_O_OTDC),
 754         [BQ27530]   = BQ27XXX_DATA(bq27530,   0         , BQ27XXX_O_UTOT),
 755         [BQ27531]   = BQ27XXX_DATA(bq27531,   0         , BQ27XXX_O_UTOT),
 756         [BQ27541]   = BQ27XXX_DATA(bq27541,   0         , BQ27XXX_O_OTDC),
 757         [BQ27542]   = BQ27XXX_DATA(bq27542,   0         , BQ27XXX_O_OTDC),
 758         [BQ27546]   = BQ27XXX_DATA(bq27546,   0         , BQ27XXX_O_OTDC),
 759         [BQ27742]   = BQ27XXX_DATA(bq27742,   0         , BQ27XXX_O_OTDC),
 760         [BQ27545]   = BQ27XXX_DATA(bq27545,   0x04143672, BQ27XXX_O_OTDC),
 761         [BQ27421]   = BQ27XXX_DATA(bq27421,   0x80008000, BQ27XXX_O_UTOT | BQ27XXX_O_CFGUP | BQ27XXX_O_RAM),
 762         [BQ27425]   = BQ27XXX_DATA(bq27425,   0x04143672, BQ27XXX_O_UTOT | BQ27XXX_O_CFGUP),
 763         [BQ27441]   = BQ27XXX_DATA(bq27441,   0x80008000, BQ27XXX_O_UTOT | BQ27XXX_O_CFGUP | BQ27XXX_O_RAM),
 764         [BQ27621]   = BQ27XXX_DATA(bq27621,   0x80008000, BQ27XXX_O_UTOT | BQ27XXX_O_CFGUP | BQ27XXX_O_RAM),
 765 };
 766
 767 static DEFINE_MUTEX(bq27xxx_list_lock);
 768 static LIST_HEAD(bq27xxx_battery_devices);
 769
 770 #define BQ27XXX_MSLEEP(i) usleep_range((i)*1000, (i)*1000+500)
 771
 772 #define BQ27XXX_DM_SZ   32
 773
 774 /**
 775  * struct bq27xxx_dm_buf - chip data memory buffer
 776  * @class: data memory subclass_id
 777  * @block: data memory block number
 778  * @data: data from/for the block
 779  * @has_data: true if data has been filled by read
 780  * @dirty: true if data has changed since last read/write
 781  *
 782  * Encapsulates info required to manage chip data memory blocks.
 783  */
 784 struct bq27xxx_dm_buf {
 785         u8 class;
 786         u8 block;
 787         u8 data[BQ27XXX_DM_SZ];
 788         bool has_data, dirty;
 789 };
 790
 791 #define BQ27XXX_DM_BUF(di, i) { \
 792         .class = (di)->dm_regs[i].subclass_id, \
 793         .block = (di)->dm_regs[i].offset / BQ27XXX_DM_SZ, \
 794 }
 795
 796 static inline u16 *bq27xxx_dm_reg_ptr(struct bq27xxx_dm_buf *buf,
 797                                       struct bq27xxx_dm_reg *reg)
 798 {
 799         if (buf->class == reg->subclass_id &&
 800             buf->block == reg->offset / BQ27XXX_DM_SZ)
 801                 return (u16 *) (buf->data + reg->offset % BQ27XXX_DM_SZ);
 802
 803         return NULL;
 804 }
 805
 806 static const char * const bq27xxx_dm_reg_name[] = {
 807         [BQ27XXX_DM_DESIGN_CAPACITY] = "design-capacity",
 808         [BQ27XXX_DM_DESIGN_ENERGY] = "design-energy",
 809         [BQ27XXX_DM_TERMINATE_VOLTAGE] = "terminate-voltage",
 810 };
 811
 812
 813 static bool bq27xxx_dt_to_nvm = true;
 814 module_param_named(dt_monitored_battery_updates_nvm, bq27xxx_dt_to_nvm, bool, 0444);
 815 MODULE_PARM_DESC(dt_monitored_battery_updates_nvm,
 816         "Devicetree monitored-battery config updates data memory on NVM/flash chips.\n"
 817         "Users must set this =0 when installing a different type of battery!\n"
 818         "Default is =1."
 819 #ifndef CONFIG_BATTERY_BQ27XXX_DT_UPDATES_NVM
 820         "\nSetting this affects future kernel updates, not the current configuration."
 821 #endif
 822 );
 823
 824 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
 825 {
 826         struct bq27xxx_device_info *di;
 827         unsigned int prev_val = *(unsigned int *) kp->arg;
 828         int ret;
 829
 830         ret = param_set_uint(val, kp);
 831         if (ret < 0 || prev_val == *(unsigned int *) kp->arg)
 832                 return ret;
 833
 834         mutex_lock(&bq27xxx_list_lock);
 835         list_for_each_entry(di, &bq27xxx_battery_devices, list)
 836                 mod_delayed_work(system_wq, &di->work, 0);
 837         mutex_unlock(&bq27xxx_list_lock);
 838
 839         return ret;
 840 }
 841
 842 static const struct kernel_param_ops param_ops_poll_interval = {
 843         .get = param_get_uint,
 844         .set = poll_interval_param_set,
 845 };
 846
 847 static unsigned int poll_interval = 360;
 848 module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
 849 MODULE_PARM_DESC(poll_interval,
 850                  "battery poll interval in seconds - 0 disables polling");
 851
 852 /*
 853  * Common code for BQ27xxx devices
 854  */
 855
 856 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 857                                bool single)
 858 {
 859         int ret;
 860
 861         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 862                 return -EINVAL;
 863
 864         ret = di->bus.read(di, di->regs[reg_index], single);
 865         if (ret < 0)
 866                 dev_dbg(di->dev, "failed to read register 0x%02x (index %d)\n",
 867                         di->regs[reg_index], reg_index);
 868
 869         return ret;
 870 }
 871
 872 static inline int bq27xxx_write(struct bq27xxx_device_info *di, int reg_index,
 873                                 u16 value, bool single)
 874 {
 875         int ret;
 876
 877         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 878                 return -EINVAL;
 879
 880         if (!di->bus.write)
 881                 return -EPERM;
 882
 883         ret = di->bus.write(di, di->regs[reg_index], value, single);
 884         if (ret < 0)
 885                 dev_dbg(di->dev, "failed to write register 0x%02x (index %d)\n",
 886                         di->regs[reg_index], reg_index);
 887
 888         return ret;
 889 }
 890
 891 static inline int bq27xxx_read_block(struct bq27xxx_device_info *di, int reg_index,
 892                                      u8 *data, int len)
 893 {
 894         int ret;
 895
 896         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 897                 return -EINVAL;
 898
 899         if (!di->bus.read_bulk)
 900                 return -EPERM;
 901
 902         ret = di->bus.read_bulk(di, di->regs[reg_index], data, len);
 903         if (ret < 0)
 904                 dev_dbg(di->dev, "failed to read_bulk register 0x%02x (index %d)\n",
 905                         di->regs[reg_index], reg_index);
 906
 907         return ret;
 908 }
 909
 910 static inline int bq27xxx_write_block(struct bq27xxx_device_info *di, int reg_index,
 911                                       u8 *data, int len)
 912 {
 913         int ret;
 914
 915         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 916                 return -EINVAL;
 917
 918         if (!di->bus.write_bulk)
 919                 return -EPERM;
 920
 921         ret = di->bus.write_bulk(di, di->regs[reg_index], data, len);
 922         if (ret < 0)
 923                 dev_dbg(di->dev, "failed to write_bulk register 0x%02x (index %d)\n",
 924                         di->regs[reg_index], reg_index);
 925
 926         return ret;
 927 }
 928
 929 static int bq27xxx_battery_seal(struct bq27xxx_device_info *di)
 930 {
 931         int ret;
 932
 933         ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, BQ27XXX_SEALED, false);
 934         if (ret < 0) {
 935                 dev_err(di->dev, "bus error on seal: %d\n", ret);
 936                 return ret;
 937         }
 938
 939         return 0;
 940 }
 941
 942 static int bq27xxx_battery_unseal(struct bq27xxx_device_info *di)
 943 {
 944         int ret;
 945
 946         if (di->unseal_key == 0) {
 947                 dev_err(di->dev, "unseal failed due to missing key\n");
 948                 return -EINVAL;
 949         }
 950
 951         ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, (u16)(di->unseal_key >> 16), false);
 952         if (ret < 0)
 953                 goto out;
 954
 955         ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, (u16)di->unseal_key, false);
 956         if (ret < 0)
 957                 goto out;
 958
 959         return 0;
 960
 961 out:
 962         dev_err(di->dev, "bus error on unseal: %d\n", ret);
 963         return ret;
 964 }
 965
 966 static u8 bq27xxx_battery_checksum_dm_block(struct bq27xxx_dm_buf *buf)
 967 {
 968         u16 sum = 0;
 969         int i;
 970
 971         for (i = 0; i < BQ27XXX_DM_SZ; i++)
 972                 sum += buf->data[i];
 973         sum &= 0xff;
 974
 975         return 0xff - sum;
 976 }
 977
 978 static int bq27xxx_battery_read_dm_block(struct bq27xxx_device_info *di,
 979                                          struct bq27xxx_dm_buf *buf)
 980 {
 981         int ret;
 982
 983         buf->has_data = false;
 984
 985         ret = bq27xxx_write(di, BQ27XXX_DM_CLASS, buf->class, true);
 986         if (ret < 0)
 987                 goto out;
 988
 989         ret = bq27xxx_write(di, BQ27XXX_DM_BLOCK, buf->block, true);
 990         if (ret < 0)
 991                 goto out;
 992
 993         BQ27XXX_MSLEEP(1);
 994
 995         ret = bq27xxx_read_block(di, BQ27XXX_DM_DATA, buf->data, BQ27XXX_DM_SZ);
 996         if (ret < 0)
 997                 goto out;
 998
 999         ret = bq27xxx_read(di, BQ27XXX_DM_CKSUM, true);
1000         if (ret < 0)
1001                 goto out;
1002
1003         if ((u8)ret != bq27xxx_battery_checksum_dm_block(buf)) {
1004                 ret = -EINVAL;
1005                 goto out;
1006         }
1007
1008         buf->has_data = true;
1009         buf->dirty = false;
1010
1011         return 0;
1012
1013 out:
1014         dev_err(di->dev, "bus error reading chip memory: %d\n", ret);
1015         return ret;
1016 }
1017
1018 static void bq27xxx_battery_update_dm_block(struct bq27xxx_device_info *di,
1019                                             struct bq27xxx_dm_buf *buf,
1020                                             enum bq27xxx_dm_reg_id reg_id,
1021                                             unsigned int val)
1022 {
1023         struct bq27xxx_dm_reg *reg = &di->dm_regs[reg_id];
1024         const char *str = bq27xxx_dm_reg_name[reg_id];
1025         u16 *prev = bq27xxx_dm_reg_ptr(buf, reg);
1026
1027         if (prev == NULL) {
1028                 dev_warn(di->dev, "buffer does not match %s dm spec\n", str);
1029                 return;
1030         }
1031
1032         if (reg->bytes != 2) {
1033                 dev_warn(di->dev, "%s dm spec has unsupported byte size\n", str);
1034                 return;
1035         }
1036
1037         if (!buf->has_data)
1038                 return;
1039
1040         if (be16_to_cpup(prev) == val) {
1041                 dev_info(di->dev, "%s has %u\n", str, val);
1042                 return;
1043         }
1044
1045 #ifdef CONFIG_BATTERY_BQ27XXX_DT_UPDATES_NVM
1046         if (!(di->opts & BQ27XXX_O_RAM) && !bq27xxx_dt_to_nvm) {
1047 #else
1048         if (!(di->opts & BQ27XXX_O_RAM)) {
1049 #endif
1050                 /* devicetree and NVM differ; defer to NVM */
1051                 dev_warn(di->dev, "%s has %u; update to %u disallowed "
1052 #ifdef CONFIG_BATTERY_BQ27XXX_DT_UPDATES_NVM
1053                          "by dt_monitored_battery_updates_nvm=0"
1054 #else
1055                          "for flash/NVM data memory"
1056 #endif
1057                          "\n", str, be16_to_cpup(prev), val);
1058                 return;
1059         }
1060
1061         dev_info(di->dev, "update %s to %u\n", str, val);
1062
1063         *prev = cpu_to_be16(val);
1064         buf->dirty = true;
1065 }
1066
1067 static int bq27xxx_battery_cfgupdate_priv(struct bq27xxx_device_info *di, bool active)
1068 {
1069         const int limit = 100;
1070         u16 cmd = active ? BQ27XXX_SET_CFGUPDATE : BQ27XXX_SOFT_RESET;
1071         int ret, try = limit;
1072
1073         ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, cmd, false);
1074         if (ret < 0)
1075                 return ret;
1076
1077         do {
1078                 BQ27XXX_MSLEEP(25);
1079                 ret = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
1080                 if (ret < 0)
1081                         return ret;
1082         } while (!!(ret & BQ27XXX_FLAG_CFGUP) != active && --try);
1083
1084         if (!try && di->chip != BQ27425) { // 425 has a bug
1085                 dev_err(di->dev, "timed out waiting for cfgupdate flag %d\n", active);
1086                 return -EINVAL;
1087         }
1088
1089         if (limit - try > 3)
1090                 dev_warn(di->dev, "cfgupdate %d, retries %d\n", active, limit - try);
1091
1092         return 0;
1093 }
1094
1095 static inline int bq27xxx_battery_set_cfgupdate(struct bq27xxx_device_info *di)
1096 {
1097         int ret = bq27xxx_battery_cfgupdate_priv(di, true);
1098         if (ret < 0 && ret != -EINVAL)
1099                 dev_err(di->dev, "bus error on set_cfgupdate: %d\n", ret);
1100
1101         return ret;
1102 }
1103
1104 static inline int bq27xxx_battery_soft_reset(struct bq27xxx_device_info *di)
1105 {
1106         int ret = bq27xxx_battery_cfgupdate_priv(di, false);
1107         if (ret < 0 && ret != -EINVAL)
1108                 dev_err(di->dev, "bus error on soft_reset: %d\n", ret);
1109
1110         return ret;
1111 }
1112
1113 static int bq27xxx_battery_write_dm_block(struct bq27xxx_device_info *di,
1114                                           struct bq27xxx_dm_buf *buf)
1115 {
1116         bool cfgup = di->opts & BQ27XXX_O_CFGUP;
1117         int ret;
1118
1119         if (!buf->dirty)
1120                 return 0;
1121
1122         if (cfgup) {
1123                 ret = bq27xxx_battery_set_cfgupdate(di);
1124                 if (ret < 0)
1125                         return ret;
1126         }
1127
1128         ret = bq27xxx_write(di, BQ27XXX_DM_CTRL, 0, true);
1129         if (ret < 0)
1130                 goto out;
1131
1132         ret = bq27xxx_write(di, BQ27XXX_DM_CLASS, buf->class, true);
1133         if (ret < 0)
1134                 goto out;
1135
1136         ret = bq27xxx_write(di, BQ27XXX_DM_BLOCK, buf->block, true);
1137         if (ret < 0)
1138                 goto out;
1139
1140         BQ27XXX_MSLEEP(1);
1141
1142         ret = bq27xxx_write_block(di, BQ27XXX_DM_DATA, buf->data, BQ27XXX_DM_SZ);
1143         if (ret < 0)
1144                 goto out;
1145
1146         ret = bq27xxx_write(di, BQ27XXX_DM_CKSUM,
1147                             bq27xxx_battery_checksum_dm_block(buf), true);
1148         if (ret < 0)
1149                 goto out;
1150
1151         /* DO NOT read BQ27XXX_DM_CKSUM here to verify it! That may cause NVM
1152          * corruption on the '425 chip (and perhaps others), which can damage
1153          * the chip.
1154          */
1155
1156         if (cfgup) {
1157                 BQ27XXX_MSLEEP(1);
1158                 ret = bq27xxx_battery_soft_reset(di);
1159                 if (ret < 0)
1160                         return ret;
1161         } else {
1162                 BQ27XXX_MSLEEP(100); /* flash DM updates in <100ms */
1163         }
1164
1165         buf->dirty = false;
1166
1167         return 0;
1168
1169 out:
1170         if (cfgup)
1171                 bq27xxx_battery_soft_reset(di);
1172
1173         dev_err(di->dev, "bus error writing chip memory: %d\n", ret);
1174         return ret;
1175 }
1176
1177 static void bq27xxx_battery_set_config(struct bq27xxx_device_info *di,
1178                                        struct power_supply_battery_info *info)
1179 {
1180         struct bq27xxx_dm_buf bd = BQ27XXX_DM_BUF(di, BQ27XXX_DM_DESIGN_CAPACITY);
1181         struct bq27xxx_dm_buf bt = BQ27XXX_DM_BUF(di, BQ27XXX_DM_TERMINATE_VOLTAGE);
1182         bool updated;
1183
1184         if (bq27xxx_battery_unseal(di) < 0)
1185                 return;
1186
1187         if (info->charge_full_design_uah != -EINVAL &&
1188             info->energy_full_design_uwh != -EINVAL) {
1189                 bq27xxx_battery_read_dm_block(di, &bd);
1190                 /* assume design energy & capacity are in same block */
1191                 bq27xxx_battery_update_dm_block(di, &bd,
1192                                         BQ27XXX_DM_DESIGN_CAPACITY,
1193                                         info->charge_full_design_uah / 1000);
1194                 bq27xxx_battery_update_dm_block(di, &bd,
1195                                         BQ27XXX_DM_DESIGN_ENERGY,
1196                                         info->energy_full_design_uwh / 1000);
1197         }
1198
1199         if (info->voltage_min_design_uv != -EINVAL) {
1200                 bool same = bd.class == bt.class && bd.block == bt.block;
1201                 if (!same)
1202                         bq27xxx_battery_read_dm_block(di, &bt);
1203                 bq27xxx_battery_update_dm_block(di, same ? &bd : &bt,
1204                                         BQ27XXX_DM_TERMINATE_VOLTAGE,
1205                                         info->voltage_min_design_uv / 1000);
1206         }
1207
1208         updated = bd.dirty || bt.dirty;
1209
1210         bq27xxx_battery_write_dm_block(di, &bd);
1211         bq27xxx_battery_write_dm_block(di, &bt);
1212
1213         bq27xxx_battery_seal(di);
1214
1215         if (updated && !(di->opts & BQ27XXX_O_CFGUP)) {
1216                 bq27xxx_write(di, BQ27XXX_REG_CTRL, BQ27XXX_RESET, false);
1217                 BQ27XXX_MSLEEP(300); /* reset time is not documented */
1218         }
1219         /* assume bq27xxx_battery_update() is called hereafter */
1220 }
1221
1222 static void bq27xxx_battery_settings(struct bq27xxx_device_info *di)
1223 {
1224         struct power_supply_battery_info info = {};
1225         unsigned int min, max;
1226
1227         if (power_supply_get_battery_info(di->bat, &info) < 0)
1228                 return;
1229
1230         if (!di->dm_regs) {
1231                 dev_warn(di->dev, "data memory update not supported for chip\n");
1232                 return;
1233         }
1234
1235         if (info.energy_full_design_uwh != info.charge_full_design_uah) {
1236                 if (info.energy_full_design_uwh == -EINVAL)
1237                         dev_warn(di->dev, "missing battery:energy-full-design-microwatt-hours\n");
1238                 else if (info.charge_full_design_uah == -EINVAL)
1239                         dev_warn(di->dev, "missing battery:charge-full-design-microamp-hours\n");
1240         }
1241
1242         /* assume min == 0 */
1243         max = di->dm_regs[BQ27XXX_DM_DESIGN_ENERGY].max;
1244         if (info.energy_full_design_uwh > max * 1000) {
1245                 dev_err(di->dev, "invalid battery:energy-full-design-microwatt-hours %d\n",
1246                         info.energy_full_design_uwh);
1247                 info.energy_full_design_uwh = -EINVAL;
1248         }
1249
1250         /* assume min == 0 */
1251         max = di->dm_regs[BQ27XXX_DM_DESIGN_CAPACITY].max;
1252         if (info.charge_full_design_uah > max * 1000) {
1253                 dev_err(di->dev, "invalid battery:charge-full-design-microamp-hours %d\n",
1254                         info.charge_full_design_uah);
1255                 info.charge_full_design_uah = -EINVAL;
1256         }
1257
1258         min = di->dm_regs[BQ27XXX_DM_TERMINATE_VOLTAGE].min;
1259         max = di->dm_regs[BQ27XXX_DM_TERMINATE_VOLTAGE].max;
1260         if ((info.voltage_min_design_uv < min * 1000 ||
1261              info.voltage_min_design_uv > max * 1000) &&
1262              info.voltage_min_design_uv != -EINVAL) {
1263                 dev_err(di->dev, "invalid battery:voltage-min-design-microvolt %d\n",
1264                         info.voltage_min_design_uv);
1265                 info.voltage_min_design_uv = -EINVAL;
1266         }
1267
1268         if ((info.energy_full_design_uwh != -EINVAL &&
1269              info.charge_full_design_uah != -EINVAL) ||
1270              info.voltage_min_design_uv  != -EINVAL)
1271                 bq27xxx_battery_set_config(di, &info);
1272 }
1273
1274 /*
1275  * Return the battery State-of-Charge
1276  * Or < 0 if something fails.
1277  */
1278 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
1279 {
1280         int soc;
1281
1282         if (di->opts & BQ27XXX_O_ZERO)
1283                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
1284         else
1285                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
1286
1287         if (soc < 0)
1288                 dev_dbg(di->dev, "error reading State-of-Charge\n");
1289
1290         return soc;
1291 }
1292
1293 /*
1294  * Return a battery charge value in µAh
1295  * Or < 0 if something fails.
1296  */
1297 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
1298 {
1299         int charge;
1300
1301         charge = bq27xxx_read(di, reg, false);
1302         if (charge < 0) {
1303                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
1304                         reg, charge);
1305                 return charge;
1306         }
1307
1308         if (di->opts & BQ27XXX_O_ZERO)
1309                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
1310         else
1311                 charge *= 1000;
1312
1313         return charge;
1314 }
1315
1316 /*
1317  * Return the battery Nominal available capacity in µAh
1318  * Or < 0 if something fails.
1319  */
1320 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
1321 {
1322         int flags;
1323
1324         if (di->opts & BQ27XXX_O_ZERO) {
1325                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
1326                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
1327                         return -ENODATA;
1328         }
1329
1330         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
1331 }
1332
1333 /*
1334  * Return the battery Full Charge Capacity in µAh
1335  * Or < 0 if something fails.
1336  */
1337 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
1338 {
1339         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
1340 }
1341
1342 /*
1343  * Return the Design Capacity in µAh
1344  * Or < 0 if something fails.
1345  */
1346 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
1347 {
1348         int dcap;
1349
1350         if (di->opts & BQ27XXX_O_ZERO)
1351                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
1352         else
1353                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
1354
1355         if (dcap < 0) {
1356                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
1357                 return dcap;
1358         }
1359
1360         if (di->opts & BQ27XXX_O_ZERO)
1361                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
1362         else
1363                 dcap *= 1000;
1364
1365         return dcap;
1366 }
1367
1368 /*
1369  * Return the battery Available energy in µWh
1370  * Or < 0 if something fails.
1371  */
1372 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
1373 {
1374         int ae;
1375
1376         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
1377         if (ae < 0) {
1378                 dev_dbg(di->dev, "error reading available energy\n");
1379                 return ae;
1380         }
1381
1382         if (di->opts & BQ27XXX_O_ZERO)
1383                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
1384         else
1385                 ae *= 1000;
1386
1387         return ae;
1388 }
1389
1390 /*
1391  * Return the battery temperature in tenths of degree Kelvin
1392  * Or < 0 if something fails.
1393  */
1394 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
1395 {
1396         int temp;
1397
1398         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
1399         if (temp < 0) {
1400                 dev_err(di->dev, "error reading temperature\n");
1401                 return temp;
1402         }
1403
1404         if (di->opts & BQ27XXX_O_ZERO)
1405                 temp = 5 * temp / 2;
1406
1407         return temp;
1408 }
1409
1410 /*
1411  * Return the battery Cycle count total
1412  * Or < 0 if something fails.
1413  */
1414 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
1415 {
1416         int cyct;
1417
1418         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
1419         if (cyct < 0)
1420                 dev_err(di->dev, "error reading cycle count total\n");
1421
1422         return cyct;
1423 }
1424
1425 /*
1426  * Read a time register.
1427  * Return < 0 if something fails.
1428  */
1429 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
1430 {
1431         int tval;
1432
1433         tval = bq27xxx_read(di, reg, false);
1434         if (tval < 0) {
1435                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
1436                         reg, tval);
1437                 return tval;
1438         }
1439
1440         if (tval == 65535)
1441                 return -ENODATA;
1442
1443         return tval * 60;
1444 }
1445
1446 /*
1447  * Returns true if a battery over temperature condition is detected
1448  */
1449 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
1450 {
1451         if (di->opts & BQ27XXX_O_OTDC)
1452                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
1453         if (di->opts & BQ27XXX_O_UTOT)
1454                 return flags & BQ27XXX_FLAG_OT;
1455
1456         return false;
1457 }
1458
1459 /*
1460  * Returns true if a battery under temperature condition is detected
1461  */
1462 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
1463 {
1464         if (di->opts & BQ27XXX_O_UTOT)
1465                 return flags & BQ27XXX_FLAG_UT;
1466
1467         return false;
1468 }
1469
1470 /*
1471  * Returns true if a low state of charge condition is detected
1472  */
1473 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
1474 {
1475         if (di->opts & BQ27XXX_O_ZERO)
1476                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
1477         else
1478                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
1479 }
1480
1481 /*
1482  * Read flag register.
1483  * Return < 0 if something fails.
1484  */
1485 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
1486 {
1487         int flags;
1488         bool has_singe_flag = di->opts & BQ27XXX_O_ZERO;
1489
1490         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
1491         if (flags < 0) {
1492                 dev_err(di->dev, "error reading flag register:%d\n", flags);
1493                 return flags;
1494         }
1495
1496         /* Unlikely but important to return first */
1497         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
1498                 return POWER_SUPPLY_HEALTH_OVERHEAT;
1499         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
1500                 return POWER_SUPPLY_HEALTH_COLD;
1501         if (unlikely(bq27xxx_battery_dead(di, flags)))
1502                 return POWER_SUPPLY_HEALTH_DEAD;
1503
1504         return POWER_SUPPLY_HEALTH_GOOD;
1505 }
1506
1507 static void bq27xxx_battery_update_unlocked(struct bq27xxx_device_info *di)
1508 {
1509         struct bq27xxx_reg_cache cache = {0, };
1510         bool has_ci_flag = di->opts & BQ27XXX_O_ZERO;
1511         bool has_singe_flag = di->opts & BQ27XXX_O_ZERO;
1512
1513         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
1514         if ((cache.flags & 0xff) == 0xff)
1515                 cache.flags = -1; /* read error */
1516         if (cache.flags >= 0) {
1517                 cache.temperature = bq27xxx_battery_read_temperature(di);
1518                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
1519                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
1520                         cache.capacity = -ENODATA;
1521                         cache.energy = -ENODATA;
1522                         cache.time_to_empty = -ENODATA;
1523                         cache.time_to_empty_avg = -ENODATA;
1524                         cache.time_to_full = -ENODATA;
1525                         cache.charge_full = -ENODATA;
1526                         cache.health = -ENODATA;
1527                 } else {
1528                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
1529                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
1530                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
1531                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
1532                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
1533                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
1534                         cache.charge_full = bq27xxx_battery_read_fcc(di);
1535                         cache.capacity = bq27xxx_battery_read_soc(di);
1536                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
1537                                 cache.energy = bq27xxx_battery_read_energy(di);
1538                         cache.health = bq27xxx_battery_read_health(di);
1539                 }
1540                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
1541                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
1542
1543                 /* We only have to read charge design full once */
1544                 if (di->charge_design_full <= 0)
1545                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
1546         }
1547
1548         if (di->cache.capacity != cache.capacity)
1549                 power_supply_changed(di->bat);
1550
1551         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
1552                 di->cache = cache;
1553
1554         di->last_update = jiffies;
1555
1556         if (!di->removed && poll_interval > 0)
1557                 mod_delayed_work(system_wq, &di->work, poll_interval * HZ);
1558 }
1559
1560 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
1561 {
1562         mutex_lock(&di->lock);
1563         bq27xxx_battery_update_unlocked(di);
1564         mutex_unlock(&di->lock);
1565 }
1566 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
1567
1568 static void bq27xxx_battery_poll(struct work_struct *work)
1569 {
1570         struct bq27xxx_device_info *di =
1571                         container_of(work, struct bq27xxx_device_info,
1572                                      work.work);
1573
1574         bq27xxx_battery_update(di);
1575 }
1576
1577 /*
1578  * Return the battery average current in µA
1579  * Note that current can be negative signed as well
1580  * Or 0 if something fails.
1581  */
1582 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
1583                                    union power_supply_propval *val)
1584 {
1585         int curr;
1586         int flags;
1587
1588         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
1589         if (curr < 0) {
1590                 dev_err(di->dev, "error reading current\n");
1591                 return curr;
1592         }
1593
1594         if (di->opts & BQ27XXX_O_ZERO) {
1595                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
1596                 if (flags & BQ27000_FLAG_CHGS) {
1597                         dev_dbg(di->dev, "negative current!\n");
1598                         curr = -curr;
1599                 }
1600
1601                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
1602         } else {
1603                 /* Other gauges return signed value */
1604                 val->intval = (int)((s16)curr) * 1000;
1605         }
1606
1607         return 0;
1608 }
1609
1610 /*
1611  * Get the average power in µW
1612  * Return < 0 if something fails.
1613  */
1614 static int bq27xxx_battery_pwr_avg(struct bq27xxx_device_info *di,
1615                                    union power_supply_propval *val)
1616 {
1617         int power;
1618
1619         power = bq27xxx_read(di, BQ27XXX_REG_AP, false);
1620         if (power < 0) {
1621                 dev_err(di->dev,
1622                         "error reading average power register %02x: %d\n",
1623                         BQ27XXX_REG_AP, power);
1624                 return power;
1625         }
1626
1627         if (di->opts & BQ27XXX_O_ZERO)
1628                 val->intval = (power * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
1629         else
1630                 /* Other gauges return a signed value in units of 10mW */
1631                 val->intval = (int)((s16)power) * 10000;
1632
1633         return 0;
1634 }
1635
1636 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
1637                                   union power_supply_propval *val)
1638 {
1639         int status;
1640
1641         if (di->opts & BQ27XXX_O_ZERO) {
1642                 if (di->cache.flags & BQ27000_FLAG_FC)
1643                         status = POWER_SUPPLY_STATUS_FULL;
1644                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
1645                         status = POWER_SUPPLY_STATUS_CHARGING;
1646                 else if (power_supply_am_i_supplied(di->bat))
1647                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1648                 else
1649                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1650         } else {
1651                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1652                         status = POWER_SUPPLY_STATUS_FULL;
1653                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
1654                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1655                 else
1656                         status = POWER_SUPPLY_STATUS_CHARGING;
1657         }
1658
1659         val->intval = status;
1660
1661         return 0;
1662 }
1663
1664 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
1665                                           union power_supply_propval *val)
1666 {
1667         int level;
1668
1669         if (di->opts & BQ27XXX_O_ZERO) {
1670                 if (di->cache.flags & BQ27000_FLAG_FC)
1671                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1672                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
1673                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1674                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
1675                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1676                 else
1677                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1678         } else {
1679                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1680                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1681                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
1682                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1683                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
1684                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1685                 else
1686                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1687         }
1688
1689         val->intval = level;
1690
1691         return 0;
1692 }
1693
1694 /*
1695  * Return the battery Voltage in millivolts
1696  * Or < 0 if something fails.
1697  */
1698 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
1699                                    union power_supply_propval *val)
1700 {
1701         int volt;
1702
1703         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
1704         if (volt < 0) {
1705                 dev_err(di->dev, "error reading voltage\n");
1706                 return volt;
1707         }
1708
1709         val->intval = volt * 1000;
1710
1711         return 0;
1712 }
1713
1714 static int bq27xxx_simple_value(int value,
1715                                 union power_supply_propval *val)
1716 {
1717         if (value < 0)
1718                 return value;
1719
1720         val->intval = value;
1721
1722         return 0;
1723 }
1724
1725 static int bq27xxx_battery_get_property(struct power_supply *psy,
1726                                         enum power_supply_property psp,
1727                                         union power_supply_propval *val)
1728 {
1729         int ret = 0;
1730         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1731
1732         mutex_lock(&di->lock);
1733         if (time_is_before_jiffies(di->last_update + 5 * HZ))
1734                 bq27xxx_battery_update_unlocked(di);
1735         mutex_unlock(&di->lock);
1736
1737         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
1738                 return -ENODEV;
1739
1740         switch (psp) {
1741         case POWER_SUPPLY_PROP_STATUS:
1742                 ret = bq27xxx_battery_status(di, val);
1743                 break;
1744         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1745                 ret = bq27xxx_battery_voltage(di, val);
1746                 break;
1747         case POWER_SUPPLY_PROP_PRESENT:
1748                 val->intval = di->cache.flags < 0 ? 0 : 1;
1749                 break;
1750         case POWER_SUPPLY_PROP_CURRENT_NOW:
1751                 ret = bq27xxx_battery_current(di, val);
1752                 break;
1753         case POWER_SUPPLY_PROP_CAPACITY:
1754                 ret = bq27xxx_simple_value(di->cache.capacity, val);
1755                 break;
1756         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1757                 ret = bq27xxx_battery_capacity_level(di, val);
1758                 break;
1759         case POWER_SUPPLY_PROP_TEMP:
1760                 ret = bq27xxx_simple_value(di->cache.temperature, val);
1761                 if (ret == 0)
1762                         val->intval -= 2731; /* convert decidegree k to c */
1763                 break;
1764         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
1765                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
1766                 break;
1767         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
1768                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
1769                 break;
1770         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
1771                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
1772                 break;
1773         case POWER_SUPPLY_PROP_TECHNOLOGY:
1774                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
1775                 break;
1776         case POWER_SUPPLY_PROP_CHARGE_NOW:
1777                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
1778                 break;
1779         case POWER_SUPPLY_PROP_CHARGE_FULL:
1780                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
1781                 break;
1782         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1783                 ret = bq27xxx_simple_value(di->charge_design_full, val);
1784                 break;
1785         /*
1786          * TODO: Implement these to make registers set from
1787          * power_supply_battery_info visible in sysfs.
1788          */
1789         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
1790         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
1791                 return -EINVAL;
1792         case POWER_SUPPLY_PROP_CYCLE_COUNT:
1793                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
1794                 break;
1795         case POWER_SUPPLY_PROP_ENERGY_NOW:
1796                 ret = bq27xxx_simple_value(di->cache.energy, val);
1797                 break;
1798         case POWER_SUPPLY_PROP_POWER_AVG:
1799                 ret = bq27xxx_battery_pwr_avg(di, val);
1800                 break;
1801         case POWER_SUPPLY_PROP_HEALTH:
1802                 ret = bq27xxx_simple_value(di->cache.health, val);
1803                 break;
1804         case POWER_SUPPLY_PROP_MANUFACTURER:
1805                 val->strval = BQ27XXX_MANUFACTURER;
1806                 break;
1807         default:
1808                 return -EINVAL;
1809         }
1810
1811         return ret;
1812 }
1813
1814 static void bq27xxx_external_power_changed(struct power_supply *psy)
1815 {
1816         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1817
1818         /* After charger plug in/out wait 0.5s for things to stabilize */
1819         mod_delayed_work(system_wq, &di->work, HZ / 2);
1820 }
1821
1822 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1823 {
1824         struct power_supply_desc *psy_desc;
1825         struct power_supply_config psy_cfg = {
1826                 .of_node = di->dev->of_node,
1827                 .drv_data = di,
1828         };
1829
1830         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1831         mutex_init(&di->lock);
1832
1833         di->regs       = bq27xxx_chip_data[di->chip].regs;
1834         di->unseal_key = bq27xxx_chip_data[di->chip].unseal_key;
1835         di->dm_regs    = bq27xxx_chip_data[di->chip].dm_regs;
1836         di->opts       = bq27xxx_chip_data[di->chip].opts;
1837
1838         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1839         if (!psy_desc)
1840                 return -ENOMEM;
1841
1842         psy_desc->name = di->name;
1843         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1844         psy_desc->properties = bq27xxx_chip_data[di->chip].props;
1845         psy_desc->num_properties = bq27xxx_chip_data[di->chip].props_size;
1846         psy_desc->get_property = bq27xxx_battery_get_property;
1847         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1848
1849         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1850         if (IS_ERR(di->bat)) {
1851                 if (PTR_ERR(di->bat) == -EPROBE_DEFER)
1852                         dev_dbg(di->dev, "failed to register battery, deferring probe\n");
1853                 else
1854                         dev_err(di->dev, "failed to register battery\n");
1855                 return PTR_ERR(di->bat);
1856         }
1857
1858         bq27xxx_battery_settings(di);
1859         bq27xxx_battery_update(di);
1860
1861         mutex_lock(&bq27xxx_list_lock);
1862         list_add(&di->list, &bq27xxx_battery_devices);
1863         mutex_unlock(&bq27xxx_list_lock);
1864
1865         return 0;
1866 }
1867 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1868
1869 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1870 {
1871         mutex_lock(&bq27xxx_list_lock);
1872         list_del(&di->list);
1873         mutex_unlock(&bq27xxx_list_lock);
1874
1875         /* Set removed to avoid bq27xxx_battery_update() re-queuing the work */
1876         mutex_lock(&di->lock);
1877         di->removed = true;
1878         mutex_unlock(&di->lock);
1879
1880         cancel_delayed_work_sync(&di->work);
1881
1882         power_supply_unregister(di->bat);
1883         mutex_destroy(&di->lock);
1884 }
1885 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1886
1887 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1888 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1889 MODULE_LICENSE("GPL");