linux/drivers/power/supply/bq25890_charger.c
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   1/*
   2 * TI BQ25890 charger driver
   3 *
   4 * Copyright (C) 2015 Intel Corporation
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * This program is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 */
  17
  18#include <linux/module.h>
  19#include <linux/i2c.h>
  20#include <linux/power_supply.h>
  21#include <linux/regmap.h>
  22#include <linux/types.h>
  23#include <linux/gpio/consumer.h>
  24#include <linux/interrupt.h>
  25#include <linux/delay.h>
  26#include <linux/usb/phy.h>
  27
  28#include <linux/acpi.h>
  29#include <linux/of.h>
  30
  31#define BQ25890_MANUFACTURER            "Texas Instruments"
  32#define BQ25890_IRQ_PIN                 "bq25890_irq"
  33
  34#define BQ25890_ID                      3
  35
  36enum bq25890_fields {
  37        F_EN_HIZ, F_EN_ILIM, F_IILIM,                                /* Reg00 */
  38        F_BHOT, F_BCOLD, F_VINDPM_OFS,                               /* Reg01 */
  39        F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN,
  40        F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN,          /* Reg02 */
  41        F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN,    /* Reg03 */
  42        F_PUMPX_EN, F_ICHG,                                          /* Reg04 */
  43        F_IPRECHG, F_ITERM,                                          /* Reg05 */
  44        F_VREG, F_BATLOWV, F_VRECHG,                                 /* Reg06 */
  45        F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR,
  46        F_JEITA_ISET,                                                /* Reg07 */
  47        F_BATCMP, F_VCLAMP, F_TREG,                                  /* Reg08 */
  48        F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET,
  49        F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN,       /* Reg09 */
  50        F_BOOSTV, F_BOOSTI,                                          /* Reg0A */
  51        F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */
  52        F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT,
  53        F_NTC_FAULT,                                                 /* Reg0C */
  54        F_FORCE_VINDPM, F_VINDPM,                                    /* Reg0D */
  55        F_THERM_STAT, F_BATV,                                        /* Reg0E */
  56        F_SYSV,                                                      /* Reg0F */
  57        F_TSPCT,                                                     /* Reg10 */
  58        F_VBUS_GD, F_VBUSV,                                          /* Reg11 */
  59        F_ICHGR,                                                     /* Reg12 */
  60        F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM,                        /* Reg13 */
  61        F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV,   /* Reg14 */
  62
  63        F_MAX_FIELDS
  64};
  65
  66/* initial field values, converted to register values */
  67struct bq25890_init_data {
  68        u8 ichg;        /* charge current               */
  69        u8 vreg;        /* regulation voltage           */
  70        u8 iterm;       /* termination current          */
  71        u8 iprechg;     /* precharge current            */
  72        u8 sysvmin;     /* minimum system voltage limit */
  73        u8 boostv;      /* boost regulation voltage     */
  74        u8 boosti;      /* boost current limit          */
  75        u8 boostf;      /* boost frequency              */
  76        u8 ilim_en;     /* enable ILIM pin              */
  77        u8 treg;        /* thermal regulation threshold */
  78};
  79
  80struct bq25890_state {
  81        u8 online;
  82        u8 chrg_status;
  83        u8 chrg_fault;
  84        u8 vsys_status;
  85        u8 boost_fault;
  86        u8 bat_fault;
  87};
  88
  89struct bq25890_device {
  90        struct i2c_client *client;
  91        struct device *dev;
  92        struct power_supply *charger;
  93
  94        struct usb_phy *usb_phy;
  95        struct notifier_block usb_nb;
  96        struct work_struct usb_work;
  97        unsigned long usb_event;
  98
  99        struct regmap *rmap;
 100        struct regmap_field *rmap_fields[F_MAX_FIELDS];
 101
 102        int chip_id;
 103        struct bq25890_init_data init_data;
 104        struct bq25890_state state;
 105
 106        struct mutex lock; /* protect state data */
 107};
 108
 109static const struct regmap_range bq25890_readonly_reg_ranges[] = {
 110        regmap_reg_range(0x0b, 0x0c),
 111        regmap_reg_range(0x0e, 0x13),
 112};
 113
 114static const struct regmap_access_table bq25890_writeable_regs = {
 115        .no_ranges = bq25890_readonly_reg_ranges,
 116        .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges),
 117};
 118
 119static const struct regmap_range bq25890_volatile_reg_ranges[] = {
 120        regmap_reg_range(0x00, 0x00),
 121        regmap_reg_range(0x09, 0x09),
 122        regmap_reg_range(0x0b, 0x0c),
 123        regmap_reg_range(0x0e, 0x14),
 124};
 125
 126static const struct regmap_access_table bq25890_volatile_regs = {
 127        .yes_ranges = bq25890_volatile_reg_ranges,
 128        .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges),
 129};
 130
 131static const struct regmap_config bq25890_regmap_config = {
 132        .reg_bits = 8,
 133        .val_bits = 8,
 134
 135        .max_register = 0x14,
 136        .cache_type = REGCACHE_RBTREE,
 137
 138        .wr_table = &bq25890_writeable_regs,
 139        .volatile_table = &bq25890_volatile_regs,
 140};
 141
 142static const struct reg_field bq25890_reg_fields[] = {
 143        /* REG00 */
 144        [F_EN_HIZ]              = REG_FIELD(0x00, 7, 7),
 145        [F_EN_ILIM]             = REG_FIELD(0x00, 6, 6),
 146        [F_IILIM]               = REG_FIELD(0x00, 0, 5),
 147        /* REG01 */
 148        [F_BHOT]                = REG_FIELD(0x01, 6, 7),
 149        [F_BCOLD]               = REG_FIELD(0x01, 5, 5),
 150        [F_VINDPM_OFS]          = REG_FIELD(0x01, 0, 4),
 151        /* REG02 */
 152        [F_CONV_START]          = REG_FIELD(0x02, 7, 7),
 153        [F_CONV_RATE]           = REG_FIELD(0x02, 6, 6),
 154        [F_BOOSTF]              = REG_FIELD(0x02, 5, 5),
 155        [F_ICO_EN]              = REG_FIELD(0x02, 4, 4),
 156        [F_HVDCP_EN]            = REG_FIELD(0x02, 3, 3),
 157        [F_MAXC_EN]             = REG_FIELD(0x02, 2, 2),
 158        [F_FORCE_DPM]           = REG_FIELD(0x02, 1, 1),
 159        [F_AUTO_DPDM_EN]        = REG_FIELD(0x02, 0, 0),
 160        /* REG03 */
 161        [F_BAT_LOAD_EN]         = REG_FIELD(0x03, 7, 7),
 162        [F_WD_RST]              = REG_FIELD(0x03, 6, 6),
 163        [F_OTG_CFG]             = REG_FIELD(0x03, 5, 5),
 164        [F_CHG_CFG]             = REG_FIELD(0x03, 4, 4),
 165        [F_SYSVMIN]             = REG_FIELD(0x03, 1, 3),
 166        /* REG04 */
 167        [F_PUMPX_EN]            = REG_FIELD(0x04, 7, 7),
 168        [F_ICHG]                = REG_FIELD(0x04, 0, 6),
 169        /* REG05 */
 170        [F_IPRECHG]             = REG_FIELD(0x05, 4, 7),
 171        [F_ITERM]               = REG_FIELD(0x05, 0, 3),
 172        /* REG06 */
 173        [F_VREG]                = REG_FIELD(0x06, 2, 7),
 174        [F_BATLOWV]             = REG_FIELD(0x06, 1, 1),
 175        [F_VRECHG]              = REG_FIELD(0x06, 0, 0),
 176        /* REG07 */
 177        [F_TERM_EN]             = REG_FIELD(0x07, 7, 7),
 178        [F_STAT_DIS]            = REG_FIELD(0x07, 6, 6),
 179        [F_WD]                  = REG_FIELD(0x07, 4, 5),
 180        [F_TMR_EN]              = REG_FIELD(0x07, 3, 3),
 181        [F_CHG_TMR]             = REG_FIELD(0x07, 1, 2),
 182        [F_JEITA_ISET]          = REG_FIELD(0x07, 0, 0),
 183        /* REG08 */
 184        [F_BATCMP]              = REG_FIELD(0x08, 6, 7),
 185        [F_VCLAMP]              = REG_FIELD(0x08, 2, 4),
 186        [F_TREG]                = REG_FIELD(0x08, 0, 1),
 187        /* REG09 */
 188        [F_FORCE_ICO]           = REG_FIELD(0x09, 7, 7),
 189        [F_TMR2X_EN]            = REG_FIELD(0x09, 6, 6),
 190        [F_BATFET_DIS]          = REG_FIELD(0x09, 5, 5),
 191        [F_JEITA_VSET]          = REG_FIELD(0x09, 4, 4),
 192        [F_BATFET_DLY]          = REG_FIELD(0x09, 3, 3),
 193        [F_BATFET_RST_EN]       = REG_FIELD(0x09, 2, 2),
 194        [F_PUMPX_UP]            = REG_FIELD(0x09, 1, 1),
 195        [F_PUMPX_DN]            = REG_FIELD(0x09, 0, 0),
 196        /* REG0A */
 197        [F_BOOSTV]              = REG_FIELD(0x0A, 4, 7),
 198        [F_BOOSTI]              = REG_FIELD(0x0A, 0, 2),
 199        /* REG0B */
 200        [F_VBUS_STAT]           = REG_FIELD(0x0B, 5, 7),
 201        [F_CHG_STAT]            = REG_FIELD(0x0B, 3, 4),
 202        [F_PG_STAT]             = REG_FIELD(0x0B, 2, 2),
 203        [F_SDP_STAT]            = REG_FIELD(0x0B, 1, 1),
 204        [F_VSYS_STAT]           = REG_FIELD(0x0B, 0, 0),
 205        /* REG0C */
 206        [F_WD_FAULT]            = REG_FIELD(0x0C, 7, 7),
 207        [F_BOOST_FAULT]         = REG_FIELD(0x0C, 6, 6),
 208        [F_CHG_FAULT]           = REG_FIELD(0x0C, 4, 5),
 209        [F_BAT_FAULT]           = REG_FIELD(0x0C, 3, 3),
 210        [F_NTC_FAULT]           = REG_FIELD(0x0C, 0, 2),
 211        /* REG0D */
 212        [F_FORCE_VINDPM]        = REG_FIELD(0x0D, 7, 7),
 213        [F_VINDPM]              = REG_FIELD(0x0D, 0, 6),
 214        /* REG0E */
 215        [F_THERM_STAT]          = REG_FIELD(0x0E, 7, 7),
 216        [F_BATV]                = REG_FIELD(0x0E, 0, 6),
 217        /* REG0F */
 218        [F_SYSV]                = REG_FIELD(0x0F, 0, 6),
 219        /* REG10 */
 220        [F_TSPCT]               = REG_FIELD(0x10, 0, 6),
 221        /* REG11 */
 222        [F_VBUS_GD]             = REG_FIELD(0x11, 7, 7),
 223        [F_VBUSV]               = REG_FIELD(0x11, 0, 6),
 224        /* REG12 */
 225        [F_ICHGR]               = REG_FIELD(0x12, 0, 6),
 226        /* REG13 */
 227        [F_VDPM_STAT]           = REG_FIELD(0x13, 7, 7),
 228        [F_IDPM_STAT]           = REG_FIELD(0x13, 6, 6),
 229        [F_IDPM_LIM]            = REG_FIELD(0x13, 0, 5),
 230        /* REG14 */
 231        [F_REG_RST]             = REG_FIELD(0x14, 7, 7),
 232        [F_ICO_OPTIMIZED]       = REG_FIELD(0x14, 6, 6),
 233        [F_PN]                  = REG_FIELD(0x14, 3, 5),
 234        [F_TS_PROFILE]          = REG_FIELD(0x14, 2, 2),
 235        [F_DEV_REV]             = REG_FIELD(0x14, 0, 1)
 236};
 237
 238/*
 239 * Most of the val -> idx conversions can be computed, given the minimum,
 240 * maximum and the step between values. For the rest of conversions, we use
 241 * lookup tables.
 242 */
 243enum bq25890_table_ids {
 244        /* range tables */
 245        TBL_ICHG,
 246        TBL_ITERM,
 247        TBL_IPRECHG,
 248        TBL_VREG,
 249        TBL_BATCMP,
 250        TBL_VCLAMP,
 251        TBL_BOOSTV,
 252        TBL_SYSVMIN,
 253
 254        /* lookup tables */
 255        TBL_TREG,
 256        TBL_BOOSTI,
 257};
 258
 259/* Thermal Regulation Threshold lookup table, in degrees Celsius */
 260static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 };
 261
 262#define BQ25890_TREG_TBL_SIZE           ARRAY_SIZE(bq25890_treg_tbl)
 263
 264/* Boost mode current limit lookup table, in uA */
 265static const u32 bq25890_boosti_tbl[] = {
 266        500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000
 267};
 268
 269#define BQ25890_BOOSTI_TBL_SIZE         ARRAY_SIZE(bq25890_boosti_tbl)
 270
 271struct bq25890_range {
 272        u32 min;
 273        u32 max;
 274        u32 step;
 275};
 276
 277struct bq25890_lookup {
 278        const u32 *tbl;
 279        u32 size;
 280};
 281
 282static const union {
 283        struct bq25890_range  rt;
 284        struct bq25890_lookup lt;
 285} bq25890_tables[] = {
 286        /* range tables */
 287        [TBL_ICHG] =    { .rt = {0,       5056000, 64000} },     /* uA */
 288        [TBL_ITERM] =   { .rt = {64000,   1024000, 64000} },     /* uA */
 289        [TBL_VREG] =    { .rt = {3840000, 4608000, 16000} },     /* uV */
 290        [TBL_BATCMP] =  { .rt = {0,       140,     20} },        /* mOhm */
 291        [TBL_VCLAMP] =  { .rt = {0,       224000,  32000} },     /* uV */
 292        [TBL_BOOSTV] =  { .rt = {4550000, 5510000, 64000} },     /* uV */
 293        [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} },    /* uV */
 294
 295        /* lookup tables */
 296        [TBL_TREG] =    { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
 297        [TBL_BOOSTI] =  { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} }
 298};
 299
 300static int bq25890_field_read(struct bq25890_device *bq,
 301                              enum bq25890_fields field_id)
 302{
 303        int ret;
 304        int val;
 305
 306        ret = regmap_field_read(bq->rmap_fields[field_id], &val);
 307        if (ret < 0)
 308                return ret;
 309
 310        return val;
 311}
 312
 313static int bq25890_field_write(struct bq25890_device *bq,
 314                               enum bq25890_fields field_id, u8 val)
 315{
 316        return regmap_field_write(bq->rmap_fields[field_id], val);
 317}
 318
 319static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id)
 320{
 321        u8 idx;
 322
 323        if (id >= TBL_TREG) {
 324                const u32 *tbl = bq25890_tables[id].lt.tbl;
 325                u32 tbl_size = bq25890_tables[id].lt.size;
 326
 327                for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++)
 328                        ;
 329        } else {
 330                const struct bq25890_range *rtbl = &bq25890_tables[id].rt;
 331                u8 rtbl_size;
 332
 333                rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1;
 334
 335                for (idx = 1;
 336                     idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value);
 337                     idx++)
 338                        ;
 339        }
 340
 341        return idx - 1;
 342}
 343
 344static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id)
 345{
 346        const struct bq25890_range *rtbl;
 347
 348        /* lookup table? */
 349        if (id >= TBL_TREG)
 350                return bq25890_tables[id].lt.tbl[idx];
 351
 352        /* range table */
 353        rtbl = &bq25890_tables[id].rt;
 354
 355        return (rtbl->min + idx * rtbl->step);
 356}
 357
 358enum bq25890_status {
 359        STATUS_NOT_CHARGING,
 360        STATUS_PRE_CHARGING,
 361        STATUS_FAST_CHARGING,
 362        STATUS_TERMINATION_DONE,
 363};
 364
 365enum bq25890_chrg_fault {
 366        CHRG_FAULT_NORMAL,
 367        CHRG_FAULT_INPUT,
 368        CHRG_FAULT_THERMAL_SHUTDOWN,
 369        CHRG_FAULT_TIMER_EXPIRED,
 370};
 371
 372static int bq25890_power_supply_get_property(struct power_supply *psy,
 373                                             enum power_supply_property psp,
 374                                             union power_supply_propval *val)
 375{
 376        int ret;
 377        struct bq25890_device *bq = power_supply_get_drvdata(psy);
 378        struct bq25890_state state;
 379
 380        mutex_lock(&bq->lock);
 381        state = bq->state;
 382        mutex_unlock(&bq->lock);
 383
 384        switch (psp) {
 385        case POWER_SUPPLY_PROP_STATUS:
 386                if (!state.online)
 387                        val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 388                else if (state.chrg_status == STATUS_NOT_CHARGING)
 389                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 390                else if (state.chrg_status == STATUS_PRE_CHARGING ||
 391                         state.chrg_status == STATUS_FAST_CHARGING)
 392                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
 393                else if (state.chrg_status == STATUS_TERMINATION_DONE)
 394                        val->intval = POWER_SUPPLY_STATUS_FULL;
 395                else
 396                        val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 397
 398                break;
 399
 400        case POWER_SUPPLY_PROP_MANUFACTURER:
 401                val->strval = BQ25890_MANUFACTURER;
 402                break;
 403
 404        case POWER_SUPPLY_PROP_ONLINE:
 405                val->intval = state.online;
 406                break;
 407
 408        case POWER_SUPPLY_PROP_HEALTH:
 409                if (!state.chrg_fault && !state.bat_fault && !state.boost_fault)
 410                        val->intval = POWER_SUPPLY_HEALTH_GOOD;
 411                else if (state.bat_fault)
 412                        val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 413                else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED)
 414                        val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
 415                else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN)
 416                        val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 417                else
 418                        val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 419                break;
 420
 421        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 422                ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */
 423                if (ret < 0)
 424                        return ret;
 425
 426                /* converted_val = ADC_val * 50mA (table 10.3.19) */
 427                val->intval = ret * 50000;
 428                break;
 429
 430        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 431                val->intval = bq25890_tables[TBL_ICHG].rt.max;
 432                break;
 433
 434        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 435                if (!state.online) {
 436                        val->intval = 0;
 437                        break;
 438                }
 439
 440                ret = bq25890_field_read(bq, F_BATV); /* read measured value */
 441                if (ret < 0)
 442                        return ret;
 443
 444                /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
 445                val->intval = 2304000 + ret * 20000;
 446                break;
 447
 448        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 449                val->intval = bq25890_tables[TBL_VREG].rt.max;
 450                break;
 451
 452        case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 453                val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
 454                break;
 455
 456        default:
 457                return -EINVAL;
 458        }
 459
 460        return 0;
 461}
 462
 463static int bq25890_get_chip_state(struct bq25890_device *bq,
 464                                  struct bq25890_state *state)
 465{
 466        int i, ret;
 467
 468        struct {
 469                enum bq25890_fields id;
 470                u8 *data;
 471        } state_fields[] = {
 472                {F_CHG_STAT,    &state->chrg_status},
 473                {F_PG_STAT,     &state->online},
 474                {F_VSYS_STAT,   &state->vsys_status},
 475                {F_BOOST_FAULT, &state->boost_fault},
 476                {F_BAT_FAULT,   &state->bat_fault},
 477                {F_CHG_FAULT,   &state->chrg_fault}
 478        };
 479
 480        for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
 481                ret = bq25890_field_read(bq, state_fields[i].id);
 482                if (ret < 0)
 483                        return ret;
 484
 485                *state_fields[i].data = ret;
 486        }
 487
 488        dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
 489                state->chrg_status, state->online, state->vsys_status,
 490                state->chrg_fault, state->boost_fault, state->bat_fault);
 491
 492        return 0;
 493}
 494
 495static bool bq25890_state_changed(struct bq25890_device *bq,
 496                                  struct bq25890_state *new_state)
 497{
 498        struct bq25890_state old_state;
 499
 500        mutex_lock(&bq->lock);
 501        old_state = bq->state;
 502        mutex_unlock(&bq->lock);
 503
 504        return (old_state.chrg_status != new_state->chrg_status ||
 505                old_state.chrg_fault != new_state->chrg_fault   ||
 506                old_state.online != new_state->online           ||
 507                old_state.bat_fault != new_state->bat_fault     ||
 508                old_state.boost_fault != new_state->boost_fault ||
 509                old_state.vsys_status != new_state->vsys_status);
 510}
 511
 512static void bq25890_handle_state_change(struct bq25890_device *bq,
 513                                        struct bq25890_state *new_state)
 514{
 515        int ret;
 516        struct bq25890_state old_state;
 517
 518        mutex_lock(&bq->lock);
 519        old_state = bq->state;
 520        mutex_unlock(&bq->lock);
 521
 522        if (!new_state->online) {                            /* power removed */
 523                /* disable ADC */
 524                ret = bq25890_field_write(bq, F_CONV_START, 0);
 525                if (ret < 0)
 526                        goto error;
 527        } else if (!old_state.online) {                     /* power inserted */
 528                /* enable ADC, to have control of charge current/voltage */
 529                ret = bq25890_field_write(bq, F_CONV_START, 1);
 530                if (ret < 0)
 531                        goto error;
 532        }
 533
 534        return;
 535
 536error:
 537        dev_err(bq->dev, "Error communicating with the chip.\n");
 538}
 539
 540static irqreturn_t bq25890_irq_handler_thread(int irq, void *private)
 541{
 542        struct bq25890_device *bq = private;
 543        int ret;
 544        struct bq25890_state state;
 545
 546        ret = bq25890_get_chip_state(bq, &state);
 547        if (ret < 0)
 548                goto handled;
 549
 550        if (!bq25890_state_changed(bq, &state))
 551                goto handled;
 552
 553        bq25890_handle_state_change(bq, &state);
 554
 555        mutex_lock(&bq->lock);
 556        bq->state = state;
 557        mutex_unlock(&bq->lock);
 558
 559        power_supply_changed(bq->charger);
 560
 561handled:
 562        return IRQ_HANDLED;
 563}
 564
 565static int bq25890_chip_reset(struct bq25890_device *bq)
 566{
 567        int ret;
 568        int rst_check_counter = 10;
 569
 570        ret = bq25890_field_write(bq, F_REG_RST, 1);
 571        if (ret < 0)
 572                return ret;
 573
 574        do {
 575                ret = bq25890_field_read(bq, F_REG_RST);
 576                if (ret < 0)
 577                        return ret;
 578
 579                usleep_range(5, 10);
 580        } while (ret == 1 && --rst_check_counter);
 581
 582        if (!rst_check_counter)
 583                return -ETIMEDOUT;
 584
 585        return 0;
 586}
 587
 588static int bq25890_hw_init(struct bq25890_device *bq)
 589{
 590        int ret;
 591        int i;
 592        struct bq25890_state state;
 593
 594        const struct {
 595                enum bq25890_fields id;
 596                u32 value;
 597        } init_data[] = {
 598                {F_ICHG,         bq->init_data.ichg},
 599                {F_VREG,         bq->init_data.vreg},
 600                {F_ITERM,        bq->init_data.iterm},
 601                {F_IPRECHG,      bq->init_data.iprechg},
 602                {F_SYSVMIN,      bq->init_data.sysvmin},
 603                {F_BOOSTV,       bq->init_data.boostv},
 604                {F_BOOSTI,       bq->init_data.boosti},
 605                {F_BOOSTF,       bq->init_data.boostf},
 606                {F_EN_ILIM,      bq->init_data.ilim_en},
 607                {F_TREG,         bq->init_data.treg}
 608        };
 609
 610        ret = bq25890_chip_reset(bq);
 611        if (ret < 0)
 612                return ret;
 613
 614        /* disable watchdog */
 615        ret = bq25890_field_write(bq, F_WD, 0);
 616        if (ret < 0)
 617                return ret;
 618
 619        /* initialize currents/voltages and other parameters */
 620        for (i = 0; i < ARRAY_SIZE(init_data); i++) {
 621                ret = bq25890_field_write(bq, init_data[i].id,
 622                                          init_data[i].value);
 623                if (ret < 0)
 624                        return ret;
 625        }
 626
 627        /* Configure ADC for continuous conversions. This does not enable it. */
 628        ret = bq25890_field_write(bq, F_CONV_RATE, 1);
 629        if (ret < 0)
 630                return ret;
 631
 632        ret = bq25890_get_chip_state(bq, &state);
 633        if (ret < 0)
 634                return ret;
 635
 636        mutex_lock(&bq->lock);
 637        bq->state = state;
 638        mutex_unlock(&bq->lock);
 639
 640        return 0;
 641}
 642
 643static enum power_supply_property bq25890_power_supply_props[] = {
 644        POWER_SUPPLY_PROP_MANUFACTURER,
 645        POWER_SUPPLY_PROP_STATUS,
 646        POWER_SUPPLY_PROP_ONLINE,
 647        POWER_SUPPLY_PROP_HEALTH,
 648        POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 649        POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 650        POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 651        POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 652        POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 653};
 654
 655static char *bq25890_charger_supplied_to[] = {
 656        "main-battery",
 657};
 658
 659static const struct power_supply_desc bq25890_power_supply_desc = {
 660        .name = "bq25890-charger",
 661        .type = POWER_SUPPLY_TYPE_USB,
 662        .properties = bq25890_power_supply_props,
 663        .num_properties = ARRAY_SIZE(bq25890_power_supply_props),
 664        .get_property = bq25890_power_supply_get_property,
 665};
 666
 667static int bq25890_power_supply_init(struct bq25890_device *bq)
 668{
 669        struct power_supply_config psy_cfg = { .drv_data = bq, };
 670
 671        psy_cfg.supplied_to = bq25890_charger_supplied_to;
 672        psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to);
 673
 674        bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc,
 675                                            &psy_cfg);
 676
 677        return PTR_ERR_OR_ZERO(bq->charger);
 678}
 679
 680static void bq25890_usb_work(struct work_struct *data)
 681{
 682        int ret;
 683        struct bq25890_device *bq =
 684                        container_of(data, struct bq25890_device, usb_work);
 685
 686        switch (bq->usb_event) {
 687        case USB_EVENT_ID:
 688                /* Enable boost mode */
 689                ret = bq25890_field_write(bq, F_OTG_CFG, 1);
 690                if (ret < 0)
 691                        goto error;
 692                break;
 693
 694        case USB_EVENT_NONE:
 695                /* Disable boost mode */
 696                ret = bq25890_field_write(bq, F_OTG_CFG, 0);
 697                if (ret < 0)
 698                        goto error;
 699
 700                power_supply_changed(bq->charger);
 701                break;
 702        }
 703
 704        return;
 705
 706error:
 707        dev_err(bq->dev, "Error switching to boost/charger mode.\n");
 708}
 709
 710static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
 711                                void *priv)
 712{
 713        struct bq25890_device *bq =
 714                        container_of(nb, struct bq25890_device, usb_nb);
 715
 716        bq->usb_event = val;
 717        queue_work(system_power_efficient_wq, &bq->usb_work);
 718
 719        return NOTIFY_OK;
 720}
 721
 722static int bq25890_irq_probe(struct bq25890_device *bq)
 723{
 724        struct gpio_desc *irq;
 725
 726        irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN);
 727        if (IS_ERR(irq)) {
 728                dev_err(bq->dev, "Could not probe irq pin.\n");
 729                return PTR_ERR(irq);
 730        }
 731
 732        return gpiod_to_irq(irq);
 733}
 734
 735static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
 736{
 737        int ret;
 738        u32 property;
 739        int i;
 740        struct bq25890_init_data *init = &bq->init_data;
 741        struct {
 742                char *name;
 743                bool optional;
 744                enum bq25890_table_ids tbl_id;
 745                u8 *conv_data; /* holds converted value from given property */
 746        } props[] = {
 747                /* required properties */
 748                {"ti,charge-current", false, TBL_ICHG, &init->ichg},
 749                {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg},
 750                {"ti,termination-current", false, TBL_ITERM, &init->iterm},
 751                {"ti,precharge-current", false, TBL_ITERM, &init->iprechg},
 752                {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin},
 753                {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv},
 754                {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},
 755
 756                /* optional properties */
 757                {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg}
 758        };
 759
 760        /* initialize data for optional properties */
 761        init->treg = 3; /* 120 degrees Celsius */
 762
 763        for (i = 0; i < ARRAY_SIZE(props); i++) {
 764                ret = device_property_read_u32(bq->dev, props[i].name,
 765                                               &property);
 766                if (ret < 0) {
 767                        if (props[i].optional)
 768                                continue;
 769
 770                        return ret;
 771                }
 772
 773                *props[i].conv_data = bq25890_find_idx(property,
 774                                                       props[i].tbl_id);
 775        }
 776
 777        return 0;
 778}
 779
 780static int bq25890_fw_probe(struct bq25890_device *bq)
 781{
 782        int ret;
 783        struct bq25890_init_data *init = &bq->init_data;
 784
 785        ret = bq25890_fw_read_u32_props(bq);
 786        if (ret < 0)
 787                return ret;
 788
 789        init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
 790        init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");
 791
 792        return 0;
 793}
 794
 795static int bq25890_probe(struct i2c_client *client,
 796                         const struct i2c_device_id *id)
 797{
 798        struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 799        struct device *dev = &client->dev;
 800        struct bq25890_device *bq;
 801        int ret;
 802        int i;
 803
 804        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 805                dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
 806                return -ENODEV;
 807        }
 808
 809        bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
 810        if (!bq)
 811                return -ENOMEM;
 812
 813        bq->client = client;
 814        bq->dev = dev;
 815
 816        mutex_init(&bq->lock);
 817
 818        bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config);
 819        if (IS_ERR(bq->rmap)) {
 820                dev_err(dev, "failed to allocate register map\n");
 821                return PTR_ERR(bq->rmap);
 822        }
 823
 824        for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) {
 825                const struct reg_field *reg_fields = bq25890_reg_fields;
 826
 827                bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap,
 828                                                             reg_fields[i]);
 829                if (IS_ERR(bq->rmap_fields[i])) {
 830                        dev_err(dev, "cannot allocate regmap field\n");
 831                        return PTR_ERR(bq->rmap_fields[i]);
 832                }
 833        }
 834
 835        i2c_set_clientdata(client, bq);
 836
 837        bq->chip_id = bq25890_field_read(bq, F_PN);
 838        if (bq->chip_id < 0) {
 839                dev_err(dev, "Cannot read chip ID.\n");
 840                return bq->chip_id;
 841        }
 842
 843        if (bq->chip_id != BQ25890_ID) {
 844                dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id);
 845                return -ENODEV;
 846        }
 847
 848        if (!dev->platform_data) {
 849                ret = bq25890_fw_probe(bq);
 850                if (ret < 0) {
 851                        dev_err(dev, "Cannot read device properties.\n");
 852                        return ret;
 853                }
 854        } else {
 855                return -ENODEV;
 856        }
 857
 858        ret = bq25890_hw_init(bq);
 859        if (ret < 0) {
 860                dev_err(dev, "Cannot initialize the chip.\n");
 861                return ret;
 862        }
 863
 864        if (client->irq <= 0)
 865                client->irq = bq25890_irq_probe(bq);
 866
 867        if (client->irq < 0) {
 868                dev_err(dev, "No irq resource found.\n");
 869                return client->irq;
 870        }
 871
 872        /* OTG reporting */
 873        bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 874        if (!IS_ERR_OR_NULL(bq->usb_phy)) {
 875                INIT_WORK(&bq->usb_work, bq25890_usb_work);
 876                bq->usb_nb.notifier_call = bq25890_usb_notifier;
 877                usb_register_notifier(bq->usb_phy, &bq->usb_nb);
 878        }
 879
 880        ret = devm_request_threaded_irq(dev, client->irq, NULL,
 881                                        bq25890_irq_handler_thread,
 882                                        IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 883                                        BQ25890_IRQ_PIN, bq);
 884        if (ret)
 885                goto irq_fail;
 886
 887        ret = bq25890_power_supply_init(bq);
 888        if (ret < 0) {
 889                dev_err(dev, "Failed to register power supply\n");
 890                goto irq_fail;
 891        }
 892
 893        return 0;
 894
 895irq_fail:
 896        if (!IS_ERR_OR_NULL(bq->usb_phy))
 897                usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
 898
 899        return ret;
 900}
 901
 902static int bq25890_remove(struct i2c_client *client)
 903{
 904        struct bq25890_device *bq = i2c_get_clientdata(client);
 905
 906        power_supply_unregister(bq->charger);
 907
 908        if (!IS_ERR_OR_NULL(bq->usb_phy))
 909                usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
 910
 911        /* reset all registers to default values */
 912        bq25890_chip_reset(bq);
 913
 914        return 0;
 915}
 916
 917#ifdef CONFIG_PM_SLEEP
 918static int bq25890_suspend(struct device *dev)
 919{
 920        struct bq25890_device *bq = dev_get_drvdata(dev);
 921
 922        /*
 923         * If charger is removed, while in suspend, make sure ADC is diabled
 924         * since it consumes slightly more power.
 925         */
 926        return bq25890_field_write(bq, F_CONV_START, 0);
 927}
 928
 929static int bq25890_resume(struct device *dev)
 930{
 931        int ret;
 932        struct bq25890_state state;
 933        struct bq25890_device *bq = dev_get_drvdata(dev);
 934
 935        ret = bq25890_get_chip_state(bq, &state);
 936        if (ret < 0)
 937                return ret;
 938
 939        mutex_lock(&bq->lock);
 940        bq->state = state;
 941        mutex_unlock(&bq->lock);
 942
 943        /* Re-enable ADC only if charger is plugged in. */
 944        if (state.online) {
 945                ret = bq25890_field_write(bq, F_CONV_START, 1);
 946                if (ret < 0)
 947                        return ret;
 948        }
 949
 950        /* signal userspace, maybe state changed while suspended */
 951        power_supply_changed(bq->charger);
 952
 953        return 0;
 954}
 955#endif
 956
 957static const struct dev_pm_ops bq25890_pm = {
 958        SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume)
 959};
 960
 961static const struct i2c_device_id bq25890_i2c_ids[] = {
 962        { "bq25890", 0 },
 963        {},
 964};
 965MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
 966
 967static const struct of_device_id bq25890_of_match[] = {
 968        { .compatible = "ti,bq25890", },
 969        { },
 970};
 971MODULE_DEVICE_TABLE(of, bq25890_of_match);
 972
 973static const struct acpi_device_id bq25890_acpi_match[] = {
 974        {"BQ258900", 0},
 975        {},
 976};
 977MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match);
 978
 979static struct i2c_driver bq25890_driver = {
 980        .driver = {
 981                .name = "bq25890-charger",
 982                .of_match_table = of_match_ptr(bq25890_of_match),
 983                .acpi_match_table = ACPI_PTR(bq25890_acpi_match),
 984                .pm = &bq25890_pm,
 985        },
 986        .probe = bq25890_probe,
 987        .remove = bq25890_remove,
 988        .id_table = bq25890_i2c_ids,
 989};
 990module_i2c_driver(bq25890_driver);
 991
 992MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>");
 993MODULE_DESCRIPTION("bq25890 charger driver");
 994MODULE_LICENSE("GPL");
 995