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                 cancel_delayed_work_sync(&di->work);
 837                 schedule_delayed_work(&di->work, 0);
 838         }
 839         mutex_unlock(&bq27xxx_list_lock);
 840
 841         return ret;
 842 }
 843
 844 static const struct kernel_param_ops param_ops_poll_interval = {
 845         .get = param_get_uint,
 846         .set = poll_interval_param_set,
 847 };
 848
 849 static unsigned int poll_interval = 360;
 850 module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
 851 MODULE_PARM_DESC(poll_interval,
 852                  "battery poll interval in seconds - 0 disables polling");
 853
 854 /*
 855  * Common code for BQ27xxx devices
 856  */
 857
 858 static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
 859                                bool single)
 860 {
 861         int ret;
 862
 863         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 864                 return -EINVAL;
 865
 866         ret = di->bus.read(di, di->regs[reg_index], single);
 867         if (ret < 0)
 868                 dev_dbg(di->dev, "failed to read register 0x%02x (index %d)\n",
 869                         di->regs[reg_index], reg_index);
 870
 871         return ret;
 872 }
 873
 874 static inline int bq27xxx_write(struct bq27xxx_device_info *di, int reg_index,
 875                                 u16 value, bool single)
 876 {
 877         int ret;
 878
 879         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 880                 return -EINVAL;
 881
 882         if (!di->bus.write)
 883                 return -EPERM;
 884
 885         ret = di->bus.write(di, di->regs[reg_index], value, single);
 886         if (ret < 0)
 887                 dev_dbg(di->dev, "failed to write register 0x%02x (index %d)\n",
 888                         di->regs[reg_index], reg_index);
 889
 890         return ret;
 891 }
 892
 893 static inline int bq27xxx_read_block(struct bq27xxx_device_info *di, int reg_index,
 894                                      u8 *data, int len)
 895 {
 896         int ret;
 897
 898         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 899                 return -EINVAL;
 900
 901         if (!di->bus.read_bulk)
 902                 return -EPERM;
 903
 904         ret = di->bus.read_bulk(di, di->regs[reg_index], data, len);
 905         if (ret < 0)
 906                 dev_dbg(di->dev, "failed to read_bulk register 0x%02x (index %d)\n",
 907                         di->regs[reg_index], reg_index);
 908
 909         return ret;
 910 }
 911
 912 static inline int bq27xxx_write_block(struct bq27xxx_device_info *di, int reg_index,
 913                                       u8 *data, int len)
 914 {
 915         int ret;
 916
 917         if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
 918                 return -EINVAL;
 919
 920         if (!di->bus.write_bulk)
 921                 return -EPERM;
 922
 923         ret = di->bus.write_bulk(di, di->regs[reg_index], data, len);
 924         if (ret < 0)
 925                 dev_dbg(di->dev, "failed to write_bulk register 0x%02x (index %d)\n",
 926                         di->regs[reg_index], reg_index);
 927
 928         return ret;
 929 }
 930
 931 static int bq27xxx_battery_seal(struct bq27xxx_device_info *di)
 932 {
 933         int ret;
 934
 935         ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, BQ27XXX_SEALED, false);
 936         if (ret < 0) {
 937                 dev_err(di->dev, "bus error on seal: %d\n", ret);
 938                 return ret;
 939         }
 940
 941         return 0;
 942 }
 943
 944 static int bq27xxx_battery_unseal(struct bq27xxx_device_info *di)
 945 {
 946         int ret;
 947
 948         if (di->unseal_key == 0) {
 949                 dev_err(di->dev, "unseal failed due to missing key\n");
 950                 return -EINVAL;
 951         }
 952
 953         ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, (u16)(di->unseal_key >> 16), false);
 954         if (ret < 0)
 955                 goto out;
 956
 957         ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, (u16)di->unseal_key, false);
 958         if (ret < 0)
 959                 goto out;
 960
 961         return 0;
 962
 963 out:
 964         dev_err(di->dev, "bus error on unseal: %d\n", ret);
 965         return ret;
 966 }
 967
 968 static u8 bq27xxx_battery_checksum_dm_block(struct bq27xxx_dm_buf *buf)
 969 {
 970         u16 sum = 0;
 971         int i;
 972
 973         for (i = 0; i < BQ27XXX_DM_SZ; i++)
 974                 sum += buf->data[i];
 975         sum &= 0xff;
 976
 977         return 0xff - sum;
 978 }
 979
 980 static int bq27xxx_battery_read_dm_block(struct bq27xxx_device_info *di,
 981                                          struct bq27xxx_dm_buf *buf)
 982 {
 983         int ret;
 984
 985         buf->has_data = false;
 986
 987         ret = bq27xxx_write(di, BQ27XXX_DM_CLASS, buf->class, true);
 988         if (ret < 0)
 989                 goto out;
 990
 991         ret = bq27xxx_write(di, BQ27XXX_DM_BLOCK, buf->block, true);
 992         if (ret < 0)
 993                 goto out;
 994
 995         BQ27XXX_MSLEEP(1);
 996
 997         ret = bq27xxx_read_block(di, BQ27XXX_DM_DATA, buf->data, BQ27XXX_DM_SZ);
 998         if (ret < 0)
 999                 goto out;
1000
1001         ret = bq27xxx_read(di, BQ27XXX_DM_CKSUM, true);
1002         if (ret < 0)
1003                 goto out;
1004
1005         if ((u8)ret != bq27xxx_battery_checksum_dm_block(buf)) {
1006                 ret = -EINVAL;
1007                 goto out;
1008         }
1009
1010         buf->has_data = true;
1011         buf->dirty = false;
1012
1013         return 0;
1014
1015 out:
1016         dev_err(di->dev, "bus error reading chip memory: %d\n", ret);
1017         return ret;
1018 }
1019
1020 static void bq27xxx_battery_update_dm_block(struct bq27xxx_device_info *di,
1021                                             struct bq27xxx_dm_buf *buf,
1022                                             enum bq27xxx_dm_reg_id reg_id,
1023                                             unsigned int val)
1024 {
1025         struct bq27xxx_dm_reg *reg = &di->dm_regs[reg_id];
1026         const char *str = bq27xxx_dm_reg_name[reg_id];
1027         u16 *prev = bq27xxx_dm_reg_ptr(buf, reg);
1028
1029         if (prev == NULL) {
1030                 dev_warn(di->dev, "buffer does not match %s dm spec\n", str);
1031                 return;
1032         }
1033
1034         if (reg->bytes != 2) {
1035                 dev_warn(di->dev, "%s dm spec has unsupported byte size\n", str);
1036                 return;
1037         }
1038
1039         if (!buf->has_data)
1040                 return;
1041
1042         if (be16_to_cpup(prev) == val) {
1043                 dev_info(di->dev, "%s has %u\n", str, val);
1044                 return;
1045         }
1046
1047 #ifdef CONFIG_BATTERY_BQ27XXX_DT_UPDATES_NVM
1048         if (!(di->opts & BQ27XXX_O_RAM) && !bq27xxx_dt_to_nvm) {
1049 #else
1050         if (!(di->opts & BQ27XXX_O_RAM)) {
1051 #endif
1052                 /* devicetree and NVM differ; defer to NVM */
1053                 dev_warn(di->dev, "%s has %u; update to %u disallowed "
1054 #ifdef CONFIG_BATTERY_BQ27XXX_DT_UPDATES_NVM
1055                          "by dt_monitored_battery_updates_nvm=0"
1056 #else
1057                          "for flash/NVM data memory"
1058 #endif
1059                          "\n", str, be16_to_cpup(prev), val);
1060                 return;
1061         }
1062
1063         dev_info(di->dev, "update %s to %u\n", str, val);
1064
1065         *prev = cpu_to_be16(val);
1066         buf->dirty = true;
1067 }
1068
1069 static int bq27xxx_battery_cfgupdate_priv(struct bq27xxx_device_info *di, bool active)
1070 {
1071         const int limit = 100;
1072         u16 cmd = active ? BQ27XXX_SET_CFGUPDATE : BQ27XXX_SOFT_RESET;
1073         int ret, try = limit;
1074
1075         ret = bq27xxx_write(di, BQ27XXX_REG_CTRL, cmd, false);
1076         if (ret < 0)
1077                 return ret;
1078
1079         do {
1080                 BQ27XXX_MSLEEP(25);
1081                 ret = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
1082                 if (ret < 0)
1083                         return ret;
1084         } while (!!(ret & BQ27XXX_FLAG_CFGUP) != active && --try);
1085
1086         if (!try && di->chip != BQ27425) { // 425 has a bug
1087                 dev_err(di->dev, "timed out waiting for cfgupdate flag %d\n", active);
1088                 return -EINVAL;
1089         }
1090
1091         if (limit - try > 3)
1092                 dev_warn(di->dev, "cfgupdate %d, retries %d\n", active, limit - try);
1093
1094         return 0;
1095 }
1096
1097 static inline int bq27xxx_battery_set_cfgupdate(struct bq27xxx_device_info *di)
1098 {
1099         int ret = bq27xxx_battery_cfgupdate_priv(di, true);
1100         if (ret < 0 && ret != -EINVAL)
1101                 dev_err(di->dev, "bus error on set_cfgupdate: %d\n", ret);
1102
1103         return ret;
1104 }
1105
1106 static inline int bq27xxx_battery_soft_reset(struct bq27xxx_device_info *di)
1107 {
1108         int ret = bq27xxx_battery_cfgupdate_priv(di, false);
1109         if (ret < 0 && ret != -EINVAL)
1110                 dev_err(di->dev, "bus error on soft_reset: %d\n", ret);
1111
1112         return ret;
1113 }
1114
1115 static int bq27xxx_battery_write_dm_block(struct bq27xxx_device_info *di,
1116                                           struct bq27xxx_dm_buf *buf)
1117 {
1118         bool cfgup = di->opts & BQ27XXX_O_CFGUP;
1119         int ret;
1120
1121         if (!buf->dirty)
1122                 return 0;
1123
1124         if (cfgup) {
1125                 ret = bq27xxx_battery_set_cfgupdate(di);
1126                 if (ret < 0)
1127                         return ret;
1128         }
1129
1130         ret = bq27xxx_write(di, BQ27XXX_DM_CTRL, 0, true);
1131         if (ret < 0)
1132                 goto out;
1133
1134         ret = bq27xxx_write(di, BQ27XXX_DM_CLASS, buf->class, true);
1135         if (ret < 0)
1136                 goto out;
1137
1138         ret = bq27xxx_write(di, BQ27XXX_DM_BLOCK, buf->block, true);
1139         if (ret < 0)
1140                 goto out;
1141
1142         BQ27XXX_MSLEEP(1);
1143
1144         ret = bq27xxx_write_block(di, BQ27XXX_DM_DATA, buf->data, BQ27XXX_DM_SZ);
1145         if (ret < 0)
1146                 goto out;
1147
1148         ret = bq27xxx_write(di, BQ27XXX_DM_CKSUM,
1149                             bq27xxx_battery_checksum_dm_block(buf), true);
1150         if (ret < 0)
1151                 goto out;
1152
1153         /* DO NOT read BQ27XXX_DM_CKSUM here to verify it! That may cause NVM
1154          * corruption on the '425 chip (and perhaps others), which can damage
1155          * the chip.
1156          */
1157
1158         if (cfgup) {
1159                 BQ27XXX_MSLEEP(1);
1160                 ret = bq27xxx_battery_soft_reset(di);
1161                 if (ret < 0)
1162                         return ret;
1163         } else {
1164                 BQ27XXX_MSLEEP(100); /* flash DM updates in <100ms */
1165         }
1166
1167         buf->dirty = false;
1168
1169         return 0;
1170
1171 out:
1172         if (cfgup)
1173                 bq27xxx_battery_soft_reset(di);
1174
1175         dev_err(di->dev, "bus error writing chip memory: %d\n", ret);
1176         return ret;
1177 }
1178
1179 static void bq27xxx_battery_set_config(struct bq27xxx_device_info *di,
1180                                        struct power_supply_battery_info *info)
1181 {
1182         struct bq27xxx_dm_buf bd = BQ27XXX_DM_BUF(di, BQ27XXX_DM_DESIGN_CAPACITY);
1183         struct bq27xxx_dm_buf bt = BQ27XXX_DM_BUF(di, BQ27XXX_DM_TERMINATE_VOLTAGE);
1184         bool updated;
1185
1186         if (bq27xxx_battery_unseal(di) < 0)
1187                 return;
1188
1189         if (info->charge_full_design_uah != -EINVAL &&
1190             info->energy_full_design_uwh != -EINVAL) {
1191                 bq27xxx_battery_read_dm_block(di, &bd);
1192                 /* assume design energy & capacity are in same block */
1193                 bq27xxx_battery_update_dm_block(di, &bd,
1194                                         BQ27XXX_DM_DESIGN_CAPACITY,
1195                                         info->charge_full_design_uah / 1000);
1196                 bq27xxx_battery_update_dm_block(di, &bd,
1197                                         BQ27XXX_DM_DESIGN_ENERGY,
1198                                         info->energy_full_design_uwh / 1000);
1199         }
1200
1201         if (info->voltage_min_design_uv != -EINVAL) {
1202                 bool same = bd.class == bt.class && bd.block == bt.block;
1203                 if (!same)
1204                         bq27xxx_battery_read_dm_block(di, &bt);
1205                 bq27xxx_battery_update_dm_block(di, same ? &bd : &bt,
1206                                         BQ27XXX_DM_TERMINATE_VOLTAGE,
1207                                         info->voltage_min_design_uv / 1000);
1208         }
1209
1210         updated = bd.dirty || bt.dirty;
1211
1212         bq27xxx_battery_write_dm_block(di, &bd);
1213         bq27xxx_battery_write_dm_block(di, &bt);
1214
1215         bq27xxx_battery_seal(di);
1216
1217         if (updated && !(di->opts & BQ27XXX_O_CFGUP)) {
1218                 bq27xxx_write(di, BQ27XXX_REG_CTRL, BQ27XXX_RESET, false);
1219                 BQ27XXX_MSLEEP(300); /* reset time is not documented */
1220         }
1221         /* assume bq27xxx_battery_update() is called hereafter */
1222 }
1223
1224 static void bq27xxx_battery_settings(struct bq27xxx_device_info *di)
1225 {
1226         struct power_supply_battery_info info = {};
1227         unsigned int min, max;
1228
1229         if (power_supply_get_battery_info(di->bat, &info) < 0)
1230                 return;
1231
1232         if (!di->dm_regs) {
1233                 dev_warn(di->dev, "data memory update not supported for chip\n");
1234                 return;
1235         }
1236
1237         if (info.energy_full_design_uwh != info.charge_full_design_uah) {
1238                 if (info.energy_full_design_uwh == -EINVAL)
1239                         dev_warn(di->dev, "missing battery:energy-full-design-microwatt-hours\n");
1240                 else if (info.charge_full_design_uah == -EINVAL)
1241                         dev_warn(di->dev, "missing battery:charge-full-design-microamp-hours\n");
1242         }
1243
1244         /* assume min == 0 */
1245         max = di->dm_regs[BQ27XXX_DM_DESIGN_ENERGY].max;
1246         if (info.energy_full_design_uwh > max * 1000) {
1247                 dev_err(di->dev, "invalid battery:energy-full-design-microwatt-hours %d\n",
1248                         info.energy_full_design_uwh);
1249                 info.energy_full_design_uwh = -EINVAL;
1250         }
1251
1252         /* assume min == 0 */
1253         max = di->dm_regs[BQ27XXX_DM_DESIGN_CAPACITY].max;
1254         if (info.charge_full_design_uah > max * 1000) {
1255                 dev_err(di->dev, "invalid battery:charge-full-design-microamp-hours %d\n",
1256                         info.charge_full_design_uah);
1257                 info.charge_full_design_uah = -EINVAL;
1258         }
1259
1260         min = di->dm_regs[BQ27XXX_DM_TERMINATE_VOLTAGE].min;
1261         max = di->dm_regs[BQ27XXX_DM_TERMINATE_VOLTAGE].max;
1262         if ((info.voltage_min_design_uv < min * 1000 ||
1263              info.voltage_min_design_uv > max * 1000) &&
1264              info.voltage_min_design_uv != -EINVAL) {
1265                 dev_err(di->dev, "invalid battery:voltage-min-design-microvolt %d\n",
1266                         info.voltage_min_design_uv);
1267                 info.voltage_min_design_uv = -EINVAL;
1268         }
1269
1270         if ((info.energy_full_design_uwh != -EINVAL &&
1271              info.charge_full_design_uah != -EINVAL) ||
1272              info.voltage_min_design_uv  != -EINVAL)
1273                 bq27xxx_battery_set_config(di, &info);
1274 }
1275
1276 /*
1277  * Return the battery State-of-Charge
1278  * Or < 0 if something fails.
1279  */
1280 static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
1281 {
1282         int soc;
1283
1284         if (di->opts & BQ27XXX_O_ZERO)
1285                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
1286         else
1287                 soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
1288
1289         if (soc < 0)
1290                 dev_dbg(di->dev, "error reading State-of-Charge\n");
1291
1292         return soc;
1293 }
1294
1295 /*
1296  * Return a battery charge value in µAh
1297  * Or < 0 if something fails.
1298  */
1299 static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
1300 {
1301         int charge;
1302
1303         charge = bq27xxx_read(di, reg, false);
1304         if (charge < 0) {
1305                 dev_dbg(di->dev, "error reading charge register %02x: %d\n",
1306                         reg, charge);
1307                 return charge;
1308         }
1309
1310         if (di->opts & BQ27XXX_O_ZERO)
1311                 charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
1312         else
1313                 charge *= 1000;
1314
1315         return charge;
1316 }
1317
1318 /*
1319  * Return the battery Nominal available capacity in µAh
1320  * Or < 0 if something fails.
1321  */
1322 static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
1323 {
1324         int flags;
1325
1326         if (di->opts & BQ27XXX_O_ZERO) {
1327                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
1328                 if (flags >= 0 && (flags & BQ27000_FLAG_CI))
1329                         return -ENODATA;
1330         }
1331
1332         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
1333 }
1334
1335 /*
1336  * Return the battery Full Charge Capacity in µAh
1337  * Or < 0 if something fails.
1338  */
1339 static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
1340 {
1341         return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
1342 }
1343
1344 /*
1345  * Return the Design Capacity in µAh
1346  * Or < 0 if something fails.
1347  */
1348 static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
1349 {
1350         int dcap;
1351
1352         if (di->opts & BQ27XXX_O_ZERO)
1353                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
1354         else
1355                 dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
1356
1357         if (dcap < 0) {
1358                 dev_dbg(di->dev, "error reading initial last measured discharge\n");
1359                 return dcap;
1360         }
1361
1362         if (di->opts & BQ27XXX_O_ZERO)
1363                 dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
1364         else
1365                 dcap *= 1000;
1366
1367         return dcap;
1368 }
1369
1370 /*
1371  * Return the battery Available energy in µWh
1372  * Or < 0 if something fails.
1373  */
1374 static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
1375 {
1376         int ae;
1377
1378         ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
1379         if (ae < 0) {
1380                 dev_dbg(di->dev, "error reading available energy\n");
1381                 return ae;
1382         }
1383
1384         if (di->opts & BQ27XXX_O_ZERO)
1385                 ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
1386         else
1387                 ae *= 1000;
1388
1389         return ae;
1390 }
1391
1392 /*
1393  * Return the battery temperature in tenths of degree Kelvin
1394  * Or < 0 if something fails.
1395  */
1396 static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
1397 {
1398         int temp;
1399
1400         temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
1401         if (temp < 0) {
1402                 dev_err(di->dev, "error reading temperature\n");
1403                 return temp;
1404         }
1405
1406         if (di->opts & BQ27XXX_O_ZERO)
1407                 temp = 5 * temp / 2;
1408
1409         return temp;
1410 }
1411
1412 /*
1413  * Return the battery Cycle count total
1414  * Or < 0 if something fails.
1415  */
1416 static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
1417 {
1418         int cyct;
1419
1420         cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
1421         if (cyct < 0)
1422                 dev_err(di->dev, "error reading cycle count total\n");
1423
1424         return cyct;
1425 }
1426
1427 /*
1428  * Read a time register.
1429  * Return < 0 if something fails.
1430  */
1431 static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
1432 {
1433         int tval;
1434
1435         tval = bq27xxx_read(di, reg, false);
1436         if (tval < 0) {
1437                 dev_dbg(di->dev, "error reading time register %02x: %d\n",
1438                         reg, tval);
1439                 return tval;
1440         }
1441
1442         if (tval == 65535)
1443                 return -ENODATA;
1444
1445         return tval * 60;
1446 }
1447
1448 /*
1449  * Returns true if a battery over temperature condition is detected
1450  */
1451 static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
1452 {
1453         if (di->opts & BQ27XXX_O_OTDC)
1454                 return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
1455         if (di->opts & BQ27XXX_O_UTOT)
1456                 return flags & BQ27XXX_FLAG_OT;
1457
1458         return false;
1459 }
1460
1461 /*
1462  * Returns true if a battery under temperature condition is detected
1463  */
1464 static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
1465 {
1466         if (di->opts & BQ27XXX_O_UTOT)
1467                 return flags & BQ27XXX_FLAG_UT;
1468
1469         return false;
1470 }
1471
1472 /*
1473  * Returns true if a low state of charge condition is detected
1474  */
1475 static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
1476 {
1477         if (di->opts & BQ27XXX_O_ZERO)
1478                 return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
1479         else
1480                 return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
1481 }
1482
1483 /*
1484  * Read flag register.
1485  * Return < 0 if something fails.
1486  */
1487 static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
1488 {
1489         int flags;
1490         bool has_singe_flag = di->opts & BQ27XXX_O_ZERO;
1491
1492         flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
1493         if (flags < 0) {
1494                 dev_err(di->dev, "error reading flag register:%d\n", flags);
1495                 return flags;
1496         }
1497
1498         /* Unlikely but important to return first */
1499         if (unlikely(bq27xxx_battery_overtemp(di, flags)))
1500                 return POWER_SUPPLY_HEALTH_OVERHEAT;
1501         if (unlikely(bq27xxx_battery_undertemp(di, flags)))
1502                 return POWER_SUPPLY_HEALTH_COLD;
1503         if (unlikely(bq27xxx_battery_dead(di, flags)))
1504                 return POWER_SUPPLY_HEALTH_DEAD;
1505
1506         return POWER_SUPPLY_HEALTH_GOOD;
1507 }
1508
1509 void bq27xxx_battery_update(struct bq27xxx_device_info *di)
1510 {
1511         struct bq27xxx_reg_cache cache = {0, };
1512         bool has_ci_flag = di->opts & BQ27XXX_O_ZERO;
1513         bool has_singe_flag = di->opts & BQ27XXX_O_ZERO;
1514
1515         cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
1516         if ((cache.flags & 0xff) == 0xff)
1517                 cache.flags = -1; /* read error */
1518         if (cache.flags >= 0) {
1519                 cache.temperature = bq27xxx_battery_read_temperature(di);
1520                 if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
1521                         dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
1522                         cache.capacity = -ENODATA;
1523                         cache.energy = -ENODATA;
1524                         cache.time_to_empty = -ENODATA;
1525                         cache.time_to_empty_avg = -ENODATA;
1526                         cache.time_to_full = -ENODATA;
1527                         cache.charge_full = -ENODATA;
1528                         cache.health = -ENODATA;
1529                 } else {
1530                         if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
1531                                 cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
1532                         if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
1533                                 cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
1534                         if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
1535                                 cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
1536                         cache.charge_full = bq27xxx_battery_read_fcc(di);
1537                         cache.capacity = bq27xxx_battery_read_soc(di);
1538                         if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
1539                                 cache.energy = bq27xxx_battery_read_energy(di);
1540                         cache.health = bq27xxx_battery_read_health(di);
1541                 }
1542                 if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
1543                         cache.cycle_count = bq27xxx_battery_read_cyct(di);
1544
1545                 /* We only have to read charge design full once */
1546                 if (di->charge_design_full <= 0)
1547                         di->charge_design_full = bq27xxx_battery_read_dcap(di);
1548         }
1549
1550         if (di->cache.capacity != cache.capacity)
1551                 power_supply_changed(di->bat);
1552
1553         if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
1554                 di->cache = cache;
1555
1556         di->last_update = jiffies;
1557 }
1558 EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
1559
1560 static void bq27xxx_battery_poll(struct work_struct *work)
1561 {
1562         struct bq27xxx_device_info *di =
1563                         container_of(work, struct bq27xxx_device_info,
1564                                      work.work);
1565
1566         bq27xxx_battery_update(di);
1567
1568         if (poll_interval > 0)
1569                 schedule_delayed_work(&di->work, poll_interval * HZ);
1570 }
1571
1572 /*
1573  * Return the battery average current in µA
1574  * Note that current can be negative signed as well
1575  * Or 0 if something fails.
1576  */
1577 static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
1578                                    union power_supply_propval *val)
1579 {
1580         int curr;
1581         int flags;
1582
1583         curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
1584         if (curr < 0) {
1585                 dev_err(di->dev, "error reading current\n");
1586                 return curr;
1587         }
1588
1589         if (di->opts & BQ27XXX_O_ZERO) {
1590                 flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
1591                 if (flags & BQ27000_FLAG_CHGS) {
1592                         dev_dbg(di->dev, "negative current!\n");
1593                         curr = -curr;
1594                 }
1595
1596                 val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
1597         } else {
1598                 /* Other gauges return signed value */
1599                 val->intval = (int)((s16)curr) * 1000;
1600         }
1601
1602         return 0;
1603 }
1604
1605 /*
1606  * Get the average power in µW
1607  * Return < 0 if something fails.
1608  */
1609 static int bq27xxx_battery_pwr_avg(struct bq27xxx_device_info *di,
1610                                    union power_supply_propval *val)
1611 {
1612         int power;
1613
1614         power = bq27xxx_read(di, BQ27XXX_REG_AP, false);
1615         if (power < 0) {
1616                 dev_err(di->dev,
1617                         "error reading average power register %02x: %d\n",
1618                         BQ27XXX_REG_AP, power);
1619                 return power;
1620         }
1621
1622         if (di->opts & BQ27XXX_O_ZERO)
1623                 val->intval = (power * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
1624         else
1625                 /* Other gauges return a signed value in units of 10mW */
1626                 val->intval = (int)((s16)power) * 10000;
1627
1628         return 0;
1629 }
1630
1631 static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
1632                                   union power_supply_propval *val)
1633 {
1634         int status;
1635
1636         if (di->opts & BQ27XXX_O_ZERO) {
1637                 if (di->cache.flags & BQ27000_FLAG_FC)
1638                         status = POWER_SUPPLY_STATUS_FULL;
1639                 else if (di->cache.flags & BQ27000_FLAG_CHGS)
1640                         status = POWER_SUPPLY_STATUS_CHARGING;
1641                 else if (power_supply_am_i_supplied(di->bat))
1642                         status = POWER_SUPPLY_STATUS_NOT_CHARGING;
1643                 else
1644                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1645         } else {
1646                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1647                         status = POWER_SUPPLY_STATUS_FULL;
1648                 else if (di->cache.flags & BQ27XXX_FLAG_DSC)
1649                         status = POWER_SUPPLY_STATUS_DISCHARGING;
1650                 else
1651                         status = POWER_SUPPLY_STATUS_CHARGING;
1652         }
1653
1654         val->intval = status;
1655
1656         return 0;
1657 }
1658
1659 static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
1660                                           union power_supply_propval *val)
1661 {
1662         int level;
1663
1664         if (di->opts & BQ27XXX_O_ZERO) {
1665                 if (di->cache.flags & BQ27000_FLAG_FC)
1666                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1667                 else if (di->cache.flags & BQ27000_FLAG_EDV1)
1668                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1669                 else if (di->cache.flags & BQ27000_FLAG_EDVF)
1670                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1671                 else
1672                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1673         } else {
1674                 if (di->cache.flags & BQ27XXX_FLAG_FC)
1675                         level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
1676                 else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
1677                         level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
1678                 else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
1679                         level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
1680                 else
1681                         level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
1682         }
1683
1684         val->intval = level;
1685
1686         return 0;
1687 }
1688
1689 /*
1690  * Return the battery Voltage in millivolts
1691  * Or < 0 if something fails.
1692  */
1693 static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
1694                                    union power_supply_propval *val)
1695 {
1696         int volt;
1697
1698         volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
1699         if (volt < 0) {
1700                 dev_err(di->dev, "error reading voltage\n");
1701                 return volt;
1702         }
1703
1704         val->intval = volt * 1000;
1705
1706         return 0;
1707 }
1708
1709 static int bq27xxx_simple_value(int value,
1710                                 union power_supply_propval *val)
1711 {
1712         if (value < 0)
1713                 return value;
1714
1715         val->intval = value;
1716
1717         return 0;
1718 }
1719
1720 static int bq27xxx_battery_get_property(struct power_supply *psy,
1721                                         enum power_supply_property psp,
1722                                         union power_supply_propval *val)
1723 {
1724         int ret = 0;
1725         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1726
1727         mutex_lock(&di->lock);
1728         if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
1729                 cancel_delayed_work_sync(&di->work);
1730                 bq27xxx_battery_poll(&di->work.work);
1731         }
1732         mutex_unlock(&di->lock);
1733
1734         if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
1735                 return -ENODEV;
1736
1737         switch (psp) {
1738         case POWER_SUPPLY_PROP_STATUS:
1739                 ret = bq27xxx_battery_status(di, val);
1740                 break;
1741         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1742                 ret = bq27xxx_battery_voltage(di, val);
1743                 break;
1744         case POWER_SUPPLY_PROP_PRESENT:
1745                 val->intval = di->cache.flags < 0 ? 0 : 1;
1746                 break;
1747         case POWER_SUPPLY_PROP_CURRENT_NOW:
1748                 ret = bq27xxx_battery_current(di, val);
1749                 break;
1750         case POWER_SUPPLY_PROP_CAPACITY:
1751                 ret = bq27xxx_simple_value(di->cache.capacity, val);
1752                 break;
1753         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
1754                 ret = bq27xxx_battery_capacity_level(di, val);
1755                 break;
1756         case POWER_SUPPLY_PROP_TEMP:
1757                 ret = bq27xxx_simple_value(di->cache.temperature, val);
1758                 if (ret == 0)
1759                         val->intval -= 2731; /* convert decidegree k to c */
1760                 break;
1761         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
1762                 ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
1763                 break;
1764         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
1765                 ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
1766                 break;
1767         case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
1768                 ret = bq27xxx_simple_value(di->cache.time_to_full, val);
1769                 break;
1770         case POWER_SUPPLY_PROP_TECHNOLOGY:
1771                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
1772                 break;
1773         case POWER_SUPPLY_PROP_CHARGE_NOW:
1774                 ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
1775                 break;
1776         case POWER_SUPPLY_PROP_CHARGE_FULL:
1777                 ret = bq27xxx_simple_value(di->cache.charge_full, val);
1778                 break;
1779         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
1780                 ret = bq27xxx_simple_value(di->charge_design_full, val);
1781                 break;
1782         /*
1783          * TODO: Implement these to make registers set from
1784          * power_supply_battery_info visible in sysfs.
1785          */
1786         case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
1787         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
1788                 return -EINVAL;
1789         case POWER_SUPPLY_PROP_CYCLE_COUNT:
1790                 ret = bq27xxx_simple_value(di->cache.cycle_count, val);
1791                 break;
1792         case POWER_SUPPLY_PROP_ENERGY_NOW:
1793                 ret = bq27xxx_simple_value(di->cache.energy, val);
1794                 break;
1795         case POWER_SUPPLY_PROP_POWER_AVG:
1796                 ret = bq27xxx_battery_pwr_avg(di, val);
1797                 break;
1798         case POWER_SUPPLY_PROP_HEALTH:
1799                 ret = bq27xxx_simple_value(di->cache.health, val);
1800                 break;
1801         case POWER_SUPPLY_PROP_MANUFACTURER:
1802                 val->strval = BQ27XXX_MANUFACTURER;
1803                 break;
1804         default:
1805                 return -EINVAL;
1806         }
1807
1808         return ret;
1809 }
1810
1811 static void bq27xxx_external_power_changed(struct power_supply *psy)
1812 {
1813         struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
1814
1815         cancel_delayed_work_sync(&di->work);
1816         schedule_delayed_work(&di->work, 0);
1817 }
1818
1819 int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
1820 {
1821         struct power_supply_desc *psy_desc;
1822         struct power_supply_config psy_cfg = {
1823                 .of_node = di->dev->of_node,
1824                 .drv_data = di,
1825         };
1826
1827         INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
1828         mutex_init(&di->lock);
1829
1830         di->regs       = bq27xxx_chip_data[di->chip].regs;
1831         di->unseal_key = bq27xxx_chip_data[di->chip].unseal_key;
1832         di->dm_regs    = bq27xxx_chip_data[di->chip].dm_regs;
1833         di->opts       = bq27xxx_chip_data[di->chip].opts;
1834
1835         psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
1836         if (!psy_desc)
1837                 return -ENOMEM;
1838
1839         psy_desc->name = di->name;
1840         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
1841         psy_desc->properties = bq27xxx_chip_data[di->chip].props;
1842         psy_desc->num_properties = bq27xxx_chip_data[di->chip].props_size;
1843         psy_desc->get_property = bq27xxx_battery_get_property;
1844         psy_desc->external_power_changed = bq27xxx_external_power_changed;
1845
1846         di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
1847         if (IS_ERR(di->bat)) {
1848                 if (PTR_ERR(di->bat) == -EPROBE_DEFER)
1849                         dev_dbg(di->dev, "failed to register battery, deferring probe\n");
1850                 else
1851                         dev_err(di->dev, "failed to register battery\n");
1852                 return PTR_ERR(di->bat);
1853         }
1854
1855         bq27xxx_battery_settings(di);
1856         bq27xxx_battery_update(di);
1857
1858         mutex_lock(&bq27xxx_list_lock);
1859         list_add(&di->list, &bq27xxx_battery_devices);
1860         mutex_unlock(&bq27xxx_list_lock);
1861
1862         return 0;
1863 }
1864 EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
1865
1866 void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
1867 {
1868         /*
1869          * power_supply_unregister call bq27xxx_battery_get_property which
1870          * call bq27xxx_battery_poll.
1871          * Make sure that bq27xxx_battery_poll will not call
1872          * schedule_delayed_work again after unregister (which cause OOPS).
1873          */
1874         poll_interval = 0;
1875
1876         cancel_delayed_work_sync(&di->work);
1877
1878         power_supply_unregister(di->bat);
1879
1880         mutex_lock(&bq27xxx_list_lock);
1881         list_del(&di->list);
1882         mutex_unlock(&bq27xxx_list_lock);
1883
1884         mutex_destroy(&di->lock);
1885 }
1886 EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
1887
1888 MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
1889 MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
1890 MODULE_LICENSE("GPL");