LXR linux/drivers/power/supply/bd99954-charger.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * ROHM BD99954 charger driver
   4 *
   5 * Copyright (C) 2020 Rohm Semiconductors
   6 *      Originally written by:
   7 *              Mikko Mutanen <mikko.mutanen@fi.rohmeurope.com>
   8 *              Markus Laine <markus.laine@fi.rohmeurope.com>
   9 *      Bugs added by:
  10 *              Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
  11 */
  12
  13/*
  14 *   The battery charging profile of BD99954.
  15 *
  16 *   Curve (1) represents charging current.
  17 *   Curve (2) represents battery voltage.
  18 *
  19 *   The BD99954 data sheet divides charging to three phases.
  20 *   a) Trickle-charge with constant current (8).
  21 *   b) pre-charge with constant current (6)
  22 *   c) fast-charge, first with constant current (5) phase. After
  23 *      the battery voltage has reached target level (4) we have constant
  24 *      voltage phase until charging current has dropped to termination
  25 *      level (7)
  26 *
  27 *    V ^                                                        ^ I
  28 *      .                                                        .
  29 *      .                                                        .
  30 *(4)` `.` ` ` ` ` ` ` ` ` ` ` ` ` ` ----------------------------.
  31 *      .                           :/                           .
  32 *      .                     o----+/:/ ` ` ` ` ` ` ` ` ` ` ` ` `.` ` (5)
  33 *      .                     +   ::  +                          .
  34 *      .                     +  /-   --                         .
  35 *      .                     +`/-     +                         .
  36 *      .                     o/-      -:                        .
  37 *      .                    .s.        +`                       .
  38 *      .                  .--+         `/                       .
  39 *      .               ..``  +          .:                      .
  40 *      .             -`      +           --                     .
  41 *      .    (2)  ...``       +            :-                    .
  42 *      .    ...``            +             -:                   .
  43 *(3)` `.`.""  ` ` ` `+-------- ` ` ` ` ` ` `.:` ` ` ` ` ` ` ` ` .` ` (6)
  44 *      .             +                       `:.                .
  45 *      .             +                         -:               .
  46 *      .             +                           -:.            .
  47 *      .             +                             .--.         .
  48 *      .   (1)       +                                `.+` ` ` `.` ` (7)
  49 *      -..............` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` + ` ` ` .` ` (8)
  50 *      .                                                +       -
  51 *      -------------------------------------------------+++++++++-->
  52 *      |   trickle   |  pre  |          fast            |
  53 *
  54 * Details of DT properties for different limits can be found from BD99954
  55 * device tree binding documentation.
  56 */
  57
  58#include <linux/delay.h>
  59#include <linux/gpio/consumer.h>
  60#include <linux/interrupt.h>
  61#include <linux/i2c.h>
  62#include <linux/kernel.h>
  63#include <linux/linear_range.h>
  64#include <linux/module.h>
  65#include <linux/mod_devicetable.h>
  66#include <linux/power_supply.h>
  67#include <linux/property.h>
  68#include <linux/regmap.h>
  69#include <linux/types.h>
  70
  71#include "bd99954-charger.h"
  72
  73struct battery_data {
  74        u16 precharge_current;  /* Trickle-charge Current */
  75        u16 fc_reg_voltage;     /* Fast Charging Regulation Voltage */
  76        u16 voltage_min;
  77        u16 voltage_max;
  78};
  79
  80/* Initial field values, converted to initial register values */
  81struct bd9995x_init_data {
  82        u16 vsysreg_set;        /* VSYS Regulation Setting */
  83        u16 ibus_lim_set;       /* VBUS input current limitation */
  84        u16 icc_lim_set;        /* VCC/VACP Input Current Limit Setting */
  85        u16 itrich_set;         /* Trickle-charge Current Setting */
  86        u16 iprech_set;         /* Pre-Charge Current Setting */
  87        u16 ichg_set;           /* Fast-Charge constant current */
  88        u16 vfastchg_reg_set1;  /* Fast Charging Regulation Voltage */
  89        u16 vprechg_th_set;     /* Pre-charge Voltage Threshold Setting */
  90        u16 vrechg_set;         /* Re-charge Battery Voltage Setting */
  91        u16 vbatovp_set;        /* Battery Over Voltage Threshold Setting */
  92        u16 iterm_set;          /* Charging termination current */
  93};
  94
  95struct bd9995x_state {
  96        u8 online;
  97        u16 chgstm_status;
  98        u16 vbat_vsys_status;
  99        u16 vbus_vcc_status;
 100};
 101
 102struct bd9995x_device {
 103        struct i2c_client *client;
 104        struct device *dev;
 105        struct power_supply *charger;
 106
 107        struct regmap *rmap;
 108        struct regmap_field *rmap_fields[F_MAX_FIELDS];
 109
 110        int chip_id;
 111        int chip_rev;
 112        struct bd9995x_init_data init_data;
 113        struct bd9995x_state state;
 114
 115        struct mutex lock; /* Protect state data */
 116};
 117
 118static const struct regmap_range bd9995x_readonly_reg_ranges[] = {
 119        regmap_reg_range(CHGSTM_STATUS, SEL_ILIM_VAL),
 120        regmap_reg_range(IOUT_DACIN_VAL, IOUT_DACIN_VAL),
 121        regmap_reg_range(VCC_UCD_STATUS, VCC_IDD_STATUS),
 122        regmap_reg_range(VBUS_UCD_STATUS, VBUS_IDD_STATUS),
 123        regmap_reg_range(CHIP_ID, CHIP_REV),
 124        regmap_reg_range(SYSTEM_STATUS, SYSTEM_STATUS),
 125        regmap_reg_range(IBATP_VAL, VBAT_AVE_VAL),
 126        regmap_reg_range(VTH_VAL, EXTIADP_AVE_VAL),
 127};
 128
 129static const struct regmap_access_table bd9995x_writeable_regs = {
 130        .no_ranges = bd9995x_readonly_reg_ranges,
 131        .n_no_ranges = ARRAY_SIZE(bd9995x_readonly_reg_ranges),
 132};
 133
 134static const struct regmap_range bd9995x_volatile_reg_ranges[] = {
 135        regmap_reg_range(CHGSTM_STATUS, WDT_STATUS),
 136        regmap_reg_range(VCC_UCD_STATUS, VCC_IDD_STATUS),
 137        regmap_reg_range(VBUS_UCD_STATUS, VBUS_IDD_STATUS),
 138        regmap_reg_range(INT0_STATUS, INT7_STATUS),
 139        regmap_reg_range(SYSTEM_STATUS, SYSTEM_CTRL_SET),
 140        regmap_reg_range(IBATP_VAL, EXTIADP_AVE_VAL), /* Measurement regs */
 141};
 142
 143static const struct regmap_access_table bd9995x_volatile_regs = {
 144        .yes_ranges = bd9995x_volatile_reg_ranges,
 145        .n_yes_ranges = ARRAY_SIZE(bd9995x_volatile_reg_ranges),
 146};
 147
 148static const struct regmap_range_cfg regmap_range_cfg[] = {
 149        {
 150        .selector_reg     = MAP_SET,
 151        .selector_mask    = 0xFFFF,
 152        .selector_shift   = 0,
 153        .window_start     = 0,
 154        .window_len       = 0x100,
 155        .range_min        = 0 * 0x100,
 156        .range_max        = 3 * 0x100,
 157        },
 158};
 159
 160static const struct regmap_config bd9995x_regmap_config = {
 161        .reg_bits = 8,
 162        .val_bits = 16,
 163        .reg_stride = 1,
 164
 165        .max_register = 3 * 0x100,
 166        .cache_type = REGCACHE_RBTREE,
 167
 168        .ranges = regmap_range_cfg,
 169        .num_ranges = ARRAY_SIZE(regmap_range_cfg),
 170        .val_format_endian = REGMAP_ENDIAN_LITTLE,
 171        .wr_table = &bd9995x_writeable_regs,
 172        .volatile_table = &bd9995x_volatile_regs,
 173};
 174
 175enum bd9995x_chrg_fault {
 176        CHRG_FAULT_NORMAL,
 177        CHRG_FAULT_INPUT,
 178        CHRG_FAULT_THERMAL_SHUTDOWN,
 179        CHRG_FAULT_TIMER_EXPIRED,
 180};
 181
 182static int bd9995x_get_prop_batt_health(struct bd9995x_device *bd)
 183{
 184        int ret, tmp;
 185
 186        ret = regmap_field_read(bd->rmap_fields[F_BATTEMP], &tmp);
 187        if (ret)
 188                return POWER_SUPPLY_HEALTH_UNKNOWN;
 189
 190        /* TODO: Check these against datasheet page 34 */
 191
 192        switch (tmp) {
 193        case ROOM:
 194                return POWER_SUPPLY_HEALTH_GOOD;
 195        case HOT1:
 196        case HOT2:
 197        case HOT3:
 198                return POWER_SUPPLY_HEALTH_OVERHEAT;
 199        case COLD1:
 200        case COLD2:
 201                return POWER_SUPPLY_HEALTH_COLD;
 202        case TEMP_DIS:
 203        case BATT_OPEN:
 204        default:
 205                return POWER_SUPPLY_HEALTH_UNKNOWN;
 206        }
 207}
 208
 209static int bd9995x_get_prop_charge_type(struct bd9995x_device *bd)
 210{
 211        int ret, tmp;
 212
 213        ret = regmap_field_read(bd->rmap_fields[F_CHGSTM_STATE], &tmp);
 214        if (ret)
 215                return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
 216
 217        switch (tmp) {
 218        case CHGSTM_TRICKLE_CHARGE:
 219        case CHGSTM_PRE_CHARGE:
 220                return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
 221        case CHGSTM_FAST_CHARGE:
 222                return POWER_SUPPLY_CHARGE_TYPE_FAST;
 223        case CHGSTM_TOP_OFF:
 224        case CHGSTM_DONE:
 225        case CHGSTM_SUSPEND:
 226                return POWER_SUPPLY_CHARGE_TYPE_NONE;
 227        default: /* Rest of the states are error related, no charging */
 228                return POWER_SUPPLY_CHARGE_TYPE_NONE;
 229        }
 230}
 231
 232static bool bd9995x_get_prop_batt_present(struct bd9995x_device *bd)
 233{
 234        int ret, tmp;
 235
 236        ret = regmap_field_read(bd->rmap_fields[F_BATTEMP], &tmp);
 237        if (ret)
 238                return false;
 239
 240        return tmp != BATT_OPEN;
 241}
 242
 243static int bd9995x_get_prop_batt_voltage(struct bd9995x_device *bd)
 244{
 245        int ret, tmp;
 246
 247        ret = regmap_field_read(bd->rmap_fields[F_VBAT_VAL], &tmp);
 248        if (ret)
 249                return 0;
 250
 251        tmp = min(tmp, 19200);
 252
 253        return tmp * 1000;
 254}
 255
 256static int bd9995x_get_prop_batt_current(struct bd9995x_device *bd)
 257{
 258        int ret, tmp;
 259
 260        ret = regmap_field_read(bd->rmap_fields[F_IBATP_VAL], &tmp);
 261        if (ret)
 262                return 0;
 263
 264        return tmp * 1000;
 265}
 266
 267#define DEFAULT_BATTERY_TEMPERATURE 250
 268
 269static int bd9995x_get_prop_batt_temp(struct bd9995x_device *bd)
 270{
 271        int ret, tmp;
 272
 273        ret = regmap_field_read(bd->rmap_fields[F_THERM_VAL], &tmp);
 274        if (ret)
 275                return DEFAULT_BATTERY_TEMPERATURE;
 276
 277        return (200 - tmp) * 10;
 278}
 279
 280static int bd9995x_power_supply_get_property(struct power_supply *psy,
 281                                             enum power_supply_property psp,
 282                                             union power_supply_propval *val)
 283{
 284        int ret, tmp;
 285        struct bd9995x_device *bd = power_supply_get_drvdata(psy);
 286        struct bd9995x_state state;
 287
 288        mutex_lock(&bd->lock);
 289        state = bd->state;
 290        mutex_unlock(&bd->lock);
 291
 292        switch (psp) {
 293        case POWER_SUPPLY_PROP_STATUS:
 294                switch (state.chgstm_status) {
 295                case CHGSTM_TRICKLE_CHARGE:
 296                case CHGSTM_PRE_CHARGE:
 297                case CHGSTM_FAST_CHARGE:
 298                case CHGSTM_TOP_OFF:
 299                        val->intval = POWER_SUPPLY_STATUS_CHARGING;
 300                        break;
 301
 302                case CHGSTM_DONE:
 303                        val->intval = POWER_SUPPLY_STATUS_FULL;
 304                        break;
 305
 306                case CHGSTM_SUSPEND:
 307                case CHGSTM_TEMPERATURE_ERROR_1:
 308                case CHGSTM_TEMPERATURE_ERROR_2:
 309                case CHGSTM_TEMPERATURE_ERROR_3:
 310                case CHGSTM_TEMPERATURE_ERROR_4:
 311                case CHGSTM_TEMPERATURE_ERROR_5:
 312                case CHGSTM_TEMPERATURE_ERROR_6:
 313                case CHGSTM_TEMPERATURE_ERROR_7:
 314                case CHGSTM_THERMAL_SHUT_DOWN_1:
 315                case CHGSTM_THERMAL_SHUT_DOWN_2:
 316                case CHGSTM_THERMAL_SHUT_DOWN_3:
 317                case CHGSTM_THERMAL_SHUT_DOWN_4:
 318                case CHGSTM_THERMAL_SHUT_DOWN_5:
 319                case CHGSTM_THERMAL_SHUT_DOWN_6:
 320                case CHGSTM_THERMAL_SHUT_DOWN_7:
 321                case CHGSTM_BATTERY_ERROR:
 322                        val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 323                        break;
 324
 325                default:
 326                        val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 327                        break;
 328                }
 329                break;
 330
 331        case POWER_SUPPLY_PROP_MANUFACTURER:
 332                val->strval = BD9995X_MANUFACTURER;
 333                break;
 334
 335        case POWER_SUPPLY_PROP_ONLINE:
 336                val->intval = state.online;
 337                break;
 338
 339        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 340                ret = regmap_field_read(bd->rmap_fields[F_IBATP_VAL], &tmp);
 341                if (ret)
 342                        return ret;
 343                val->intval = tmp * 1000;
 344                break;
 345
 346        case POWER_SUPPLY_PROP_CHARGE_AVG:
 347                ret = regmap_field_read(bd->rmap_fields[F_IBATP_AVE_VAL], &tmp);
 348                if (ret)
 349                        return ret;
 350                val->intval = tmp * 1000;
 351                break;
 352
 353        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 354                /*
 355                 * Currently the DT uses this property to give the
 356                 * target current for fast-charging constant current phase.
 357                 * I think it is correct in a sense.
 358                 *
 359                 * Yet, this prop we read and return here is the programmed
 360                 * safety limit for combined input currents. This feels
 361                 * also correct in a sense.
 362                 *
 363                 * However, this results a mismatch to DT value and value
 364                 * read from sysfs.
 365                 */
 366                ret = regmap_field_read(bd->rmap_fields[F_SEL_ILIM_VAL], &tmp);
 367                if (ret)
 368                        return ret;
 369                val->intval = tmp * 1000;
 370                break;
 371
 372        case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 373                if (!state.online) {
 374                        val->intval = 0;
 375                        break;
 376                }
 377
 378                ret = regmap_field_read(bd->rmap_fields[F_VFASTCHG_REG_SET1],
 379                                        &tmp);
 380                if (ret)
 381                        return ret;
 382
 383                /*
 384                 * The actual range : 2560 to 19200 mV. No matter what the
 385                 * register says
 386                 */
 387                val->intval = clamp_val(tmp << 4, 2560, 19200);
 388                val->intval *= 1000;
 389                break;
 390
 391        case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 392                ret = regmap_field_read(bd->rmap_fields[F_ITERM_SET], &tmp);
 393                if (ret)
 394                        return ret;
 395                /* Start step is 64 mA */
 396                val->intval = tmp << 6;
 397                /* Maximum is 1024 mA - no matter what register says */
 398                val->intval = min(val->intval, 1024);
 399                val->intval *= 1000;
 400                break;
 401
 402        /* Battery properties which we access through charger */
 403        case POWER_SUPPLY_PROP_PRESENT:
 404                val->intval = bd9995x_get_prop_batt_present(bd);
 405                break;
 406
 407        case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 408                val->intval = bd9995x_get_prop_batt_voltage(bd);
 409                break;
 410
 411        case POWER_SUPPLY_PROP_CURRENT_NOW:
 412                val->intval = bd9995x_get_prop_batt_current(bd);
 413                break;
 414
 415        case POWER_SUPPLY_PROP_CHARGE_TYPE:
 416                val->intval = bd9995x_get_prop_charge_type(bd);
 417                break;
 418
 419        case POWER_SUPPLY_PROP_HEALTH:
 420                val->intval = bd9995x_get_prop_batt_health(bd);
 421                break;
 422
 423        case POWER_SUPPLY_PROP_TEMP:
 424                val->intval = bd9995x_get_prop_batt_temp(bd);
 425                break;
 426
 427        case POWER_SUPPLY_PROP_TECHNOLOGY:
 428                val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 429                break;
 430
 431        case POWER_SUPPLY_PROP_MODEL_NAME:
 432                val->strval = "bd99954";
 433                break;
 434
 435        default:
 436                return -EINVAL;
 437
 438        }
 439
 440        return 0;
 441}
 442
 443static int bd9995x_get_chip_state(struct bd9995x_device *bd,
 444                                  struct bd9995x_state *state)
 445{
 446        int i, ret, tmp;
 447        struct {
 448                struct regmap_field *id;
 449                u16 *data;
 450        } state_fields[] = {
 451                {
 452                        bd->rmap_fields[F_CHGSTM_STATE], &state->chgstm_status,
 453                }, {
 454                        bd->rmap_fields[F_VBAT_VSYS_STATUS],
 455                        &state->vbat_vsys_status,
 456                }, {
 457                        bd->rmap_fields[F_VBUS_VCC_STATUS],
 458                        &state->vbus_vcc_status,
 459                },
 460        };
 461
 462
 463        for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
 464                ret = regmap_field_read(state_fields[i].id, &tmp);
 465                if (ret)
 466                        return ret;
 467
 468                *state_fields[i].data = tmp;
 469        }
 470
 471        if (state->vbus_vcc_status & STATUS_VCC_DET ||
 472            state->vbus_vcc_status & STATUS_VBUS_DET)
 473                state->online = 1;
 474        else
 475                state->online = 0;
 476
 477        return 0;
 478}
 479
 480static irqreturn_t bd9995x_irq_handler_thread(int irq, void *private)
 481{
 482        struct bd9995x_device *bd = private;
 483        int ret, status, mask, i;
 484        unsigned long tmp;
 485        struct bd9995x_state state;
 486
 487        /*
 488         * The bd9995x does not seem to generate big amount of interrupts.
 489         * The logic regarding which interrupts can cause relevant
 490         * status changes seem to be pretty complex.
 491         *
 492         * So lets implement really simple and hopefully bullet-proof handler:
 493         * It does not really matter which IRQ we handle, we just go and
 494         * re-read all interesting statuses + give the framework a nudge.
 495         *
 496         * Other option would be building a _complex_ and error prone logic
 497         * trying to decide what could have been changed (resulting this IRQ
 498         * we are now handling). During the normal operation the BD99954 does
 499         * not seem to be generating much of interrupts so benefit from such
 500         * logic would probably be minimal.
 501         */
 502
 503        ret = regmap_read(bd->rmap, INT0_STATUS, &status);
 504        if (ret) {
 505                dev_err(bd->dev, "Failed to read IRQ status\n");
 506                return IRQ_NONE;
 507        }
 508
 509        ret = regmap_field_read(bd->rmap_fields[F_INT0_SET], &mask);
 510        if (ret) {
 511                dev_err(bd->dev, "Failed to read IRQ mask\n");
 512                return IRQ_NONE;
 513        }
 514
 515        /* Handle only IRQs that are not masked */
 516        status &= mask;
 517        tmp = status;
 518
 519        /* Lowest bit does not represent any sub-registers */
 520        tmp >>= 1;
 521
 522        /*
 523         * Mask and ack IRQs we will handle (+ the idiot bit)
 524         */
 525        ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], 0);
 526        if (ret) {
 527                dev_err(bd->dev, "Failed to mask F_INT0\n");
 528                return IRQ_NONE;
 529        }
 530
 531        ret = regmap_write(bd->rmap, INT0_STATUS, status);
 532        if (ret) {
 533                dev_err(bd->dev, "Failed to ack F_INT0\n");
 534                goto err_umask;
 535        }
 536
 537        for_each_set_bit(i, &tmp, 7) {
 538                int sub_status, sub_mask;
 539                int sub_status_reg[] = {
 540                        INT1_STATUS, INT2_STATUS, INT3_STATUS, INT4_STATUS,
 541                        INT5_STATUS, INT6_STATUS, INT7_STATUS,
 542                };
 543                struct regmap_field *sub_mask_f[] = {
 544                        bd->rmap_fields[F_INT1_SET],
 545                        bd->rmap_fields[F_INT2_SET],
 546                        bd->rmap_fields[F_INT3_SET],
 547                        bd->rmap_fields[F_INT4_SET],
 548                        bd->rmap_fields[F_INT5_SET],
 549                        bd->rmap_fields[F_INT6_SET],
 550                        bd->rmap_fields[F_INT7_SET],
 551                };
 552
 553                /* Clear sub IRQs */
 554                ret = regmap_read(bd->rmap, sub_status_reg[i], &sub_status);
 555                if (ret) {
 556                        dev_err(bd->dev, "Failed to read IRQ sub-status\n");
 557                        goto err_umask;
 558                }
 559
 560                ret = regmap_field_read(sub_mask_f[i], &sub_mask);
 561                if (ret) {
 562                        dev_err(bd->dev, "Failed to read IRQ sub-mask\n");
 563                        goto err_umask;
 564                }
 565
 566                /* Ack active sub-statuses */
 567                sub_status &= sub_mask;
 568
 569                ret = regmap_write(bd->rmap, sub_status_reg[i], sub_status);
 570                if (ret) {
 571                        dev_err(bd->dev, "Failed to ack sub-IRQ\n");
 572                        goto err_umask;
 573                }
 574        }
 575
 576        ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], mask);
 577        if (ret)
 578                /* May as well retry once */
 579                goto err_umask;
 580
 581        /* Read whole chip state */
 582        ret = bd9995x_get_chip_state(bd, &state);
 583        if (ret < 0) {
 584                dev_err(bd->dev, "Failed to read chip state\n");
 585        } else {
 586                mutex_lock(&bd->lock);
 587                bd->state = state;
 588                mutex_unlock(&bd->lock);
 589
 590                power_supply_changed(bd->charger);
 591        }
 592
 593        return IRQ_HANDLED;
 594
 595err_umask:
 596        ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], mask);
 597        if (ret)
 598                dev_err(bd->dev,
 599                "Failed to un-mask F_INT0 - IRQ permanently disabled\n");
 600
 601        return IRQ_NONE;
 602}
 603
 604static int __bd9995x_chip_reset(struct bd9995x_device *bd)
 605{
 606        int ret, state;
 607        int rst_check_counter = 10;
 608        u16 tmp = ALLRST | OTPLD;
 609
 610        ret = regmap_raw_write(bd->rmap, SYSTEM_CTRL_SET, &tmp, 2);
 611        if (ret < 0)
 612                return ret;
 613
 614        do {
 615                ret = regmap_field_read(bd->rmap_fields[F_OTPLD_STATE], &state);
 616                if (ret)
 617                        return ret;
 618
 619                msleep(10);
 620        } while (state == 0 && --rst_check_counter);
 621
 622        if (!rst_check_counter) {
 623                dev_err(bd->dev, "chip reset not completed\n");
 624                return -ETIMEDOUT;
 625        }
 626
 627        tmp = 0;
 628        ret = regmap_raw_write(bd->rmap, SYSTEM_CTRL_SET, &tmp, 2);
 629
 630        return ret;
 631}
 632
 633static int bd9995x_hw_init(struct bd9995x_device *bd)
 634{
 635        int ret;
 636        int i;
 637        struct bd9995x_state state;
 638        struct bd9995x_init_data *id = &bd->init_data;
 639
 640        const struct {
 641                enum bd9995x_fields id;
 642                u16 value;
 643        } init_data[] = {
 644                /* Enable the charging trigger after SDP charger attached */
 645                {F_SDP_CHG_TRIG_EN,     1},
 646                /* Enable charging trigger after SDP charger attached */
 647                {F_SDP_CHG_TRIG,        1},
 648                /* Disable charging trigger by BC1.2 detection */
 649                {F_VBUS_BC_DISEN,       1},
 650                /* Disable charging trigger by BC1.2 detection */
 651                {F_VCC_BC_DISEN,        1},
 652                /* Disable automatic limitation of the input current */
 653                {F_ILIM_AUTO_DISEN,     1},
 654                /* Select current limitation when SDP charger attached*/
 655                {F_SDP_500_SEL,         1},
 656                /* Select current limitation when DCP charger attached */
 657                {F_DCP_2500_SEL,        1},
 658                {F_VSYSREG_SET,         id->vsysreg_set},
 659                /* Activate USB charging and DC/DC converter */
 660                {F_USB_SUS,             0},
 661                /* DCDC clock: 1200 kHz*/
 662                {F_DCDC_CLK_SEL,        3},
 663                /* Enable charging */
 664                {F_CHG_EN,              1},
 665                /* Disable Input current Limit setting voltage measurement */
 666                {F_EXTIADPEN,           0},
 667                /* Disable input current limiting */
 668                {F_VSYS_PRIORITY,       1},
 669                {F_IBUS_LIM_SET,        id->ibus_lim_set},
 670                {F_ICC_LIM_SET,         id->icc_lim_set},
 671                /* Charge Termination Current Setting to 0*/
 672                {F_ITERM_SET,           id->iterm_set},
 673                /* Trickle-charge Current Setting */
 674                {F_ITRICH_SET,          id->itrich_set},
 675                /* Pre-charge Current setting */
 676                {F_IPRECH_SET,          id->iprech_set},
 677                /* Fast Charge Current for constant current phase */
 678                {F_ICHG_SET,            id->ichg_set},
 679                /* Fast Charge Voltage Regulation Setting */
 680                {F_VFASTCHG_REG_SET1,   id->vfastchg_reg_set1},
 681                /* Set Pre-charge Voltage Threshold for trickle charging. */
 682                {F_VPRECHG_TH_SET,      id->vprechg_th_set},
 683                {F_VRECHG_SET,          id->vrechg_set},
 684                {F_VBATOVP_SET,         id->vbatovp_set},
 685                /* Reverse buck boost voltage Setting */
 686                {F_VRBOOST_SET,         0},
 687                /* Disable fast-charging watchdog */
 688                {F_WDT_FST,             0},
 689                /* Disable pre-charging watchdog */
 690                {F_WDT_PRE,             0},
 691                /* Power save off */
 692                {F_POWER_SAVE_MODE,     0},
 693                {F_INT1_SET,            INT1_ALL},
 694                {F_INT2_SET,            INT2_ALL},
 695                {F_INT3_SET,            INT3_ALL},
 696                {F_INT4_SET,            INT4_ALL},
 697                {F_INT5_SET,            INT5_ALL},
 698                {F_INT6_SET,            INT6_ALL},
 699                {F_INT7_SET,            INT7_ALL},
 700        };
 701
 702        /*
 703         * Currently we initialize charger to a known state at startup.
 704         * If we want to allow for example the boot code to initialize
 705         * charger we should get rid of this.
 706         */
 707        ret = __bd9995x_chip_reset(bd);
 708        if (ret < 0)
 709                return ret;
 710
 711        /* Initialize currents/voltages and other parameters */
 712        for (i = 0; i < ARRAY_SIZE(init_data); i++) {
 713                ret = regmap_field_write(bd->rmap_fields[init_data[i].id],
 714                                         init_data[i].value);
 715                if (ret) {
 716                        dev_err(bd->dev, "failed to initialize charger (%d)\n",
 717                                ret);
 718                        return ret;
 719                }
 720        }
 721
 722        ret = bd9995x_get_chip_state(bd, &state);
 723        if (ret < 0)
 724                return ret;
 725
 726        mutex_lock(&bd->lock);
 727        bd->state = state;
 728        mutex_unlock(&bd->lock);
 729
 730        return 0;
 731}
 732
 733static enum power_supply_property bd9995x_power_supply_props[] = {
 734        POWER_SUPPLY_PROP_MANUFACTURER,
 735        POWER_SUPPLY_PROP_STATUS,
 736        POWER_SUPPLY_PROP_ONLINE,
 737        POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 738        POWER_SUPPLY_PROP_CHARGE_AVG,
 739        POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 740        POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 741        POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 742        /* Battery props we access through charger */
 743        POWER_SUPPLY_PROP_PRESENT,
 744        POWER_SUPPLY_PROP_VOLTAGE_NOW,
 745        POWER_SUPPLY_PROP_CURRENT_NOW,
 746        POWER_SUPPLY_PROP_CHARGE_TYPE,
 747        POWER_SUPPLY_PROP_HEALTH,
 748        POWER_SUPPLY_PROP_TEMP,
 749        POWER_SUPPLY_PROP_TECHNOLOGY,
 750        POWER_SUPPLY_PROP_MODEL_NAME,
 751};
 752
 753static const struct power_supply_desc bd9995x_power_supply_desc = {
 754        .name = "bd9995x-charger",
 755        .type = POWER_SUPPLY_TYPE_USB,
 756        .properties = bd9995x_power_supply_props,
 757        .num_properties = ARRAY_SIZE(bd9995x_power_supply_props),
 758        .get_property = bd9995x_power_supply_get_property,
 759};
 760
 761/*
 762 * Limit configurations for vbus-input-current and vcc-vacp-input-current
 763 * Minimum limit is 0 uA. Max is 511 * 32000 uA = 16352000 uA. This is
 764 * configured by writing a register so that each increment in register
 765 * value equals to 32000 uA limit increment.
 766 *
 767 * Eg, value 0x0 is limit 0, value 0x1 is limit 32000, ...
 768 * Describe the setting in linear_range table.
 769 */
 770static const struct linear_range input_current_limit_ranges[] = {
 771        {
 772                .min = 0,
 773                .step = 32000,
 774                .min_sel = 0x0,
 775                .max_sel = 0x1ff,
 776        },
 777};
 778
 779/* Possible trickle, pre-charging and termination current values */
 780static const struct linear_range charging_current_ranges[] = {
 781        {
 782                .min = 0,
 783                .step = 64000,
 784                .min_sel = 0x0,
 785                .max_sel = 0x10,
 786        }, {
 787                .min = 1024000,
 788                .step = 0,
 789                .min_sel = 0x11,
 790                .max_sel = 0x1f,
 791        },
 792};
 793
 794/*
 795 * Fast charging voltage regulation, starting re-charging limit
 796 * and battery over voltage protection have same possible values
 797 */
 798static const struct linear_range charge_voltage_regulation_ranges[] = {
 799        {
 800                .min = 2560000,
 801                .step = 0,
 802                .min_sel = 0,
 803                .max_sel = 0xA0,
 804        }, {
 805                .min = 2560000,
 806                .step = 16000,
 807                .min_sel = 0xA0,
 808                .max_sel = 0x4B0,
 809        }, {
 810                .min = 19200000,
 811                .step = 0,
 812                .min_sel = 0x4B0,
 813                .max_sel = 0x7FF,
 814        },
 815};
 816
 817/* Possible VSYS voltage regulation values */
 818static const struct linear_range vsys_voltage_regulation_ranges[] = {
 819        {
 820                .min = 2560000,
 821                .step = 0,
 822                .min_sel = 0,
 823                .max_sel = 0x28,
 824        }, {
 825                .min = 2560000,
 826                .step = 64000,
 827                .min_sel = 0x28,
 828                .max_sel = 0x12C,
 829        }, {
 830                .min = 19200000,
 831                .step = 0,
 832                .min_sel = 0x12C,
 833                .max_sel = 0x1FF,
 834        },
 835};
 836
 837/* Possible settings for switching from trickle to pre-charging limits */
 838static const struct linear_range trickle_to_pre_threshold_ranges[] = {
 839        {
 840                .min = 2048000,
 841                .step = 0,
 842                .min_sel = 0,
 843                .max_sel = 0x20,
 844        }, {
 845                .min = 2048000,
 846                .step = 64000,
 847                .min_sel = 0x20,
 848                .max_sel = 0x12C,
 849        }, {
 850                .min = 19200000,
 851                .step = 0,
 852                .min_sel = 0x12C,
 853                .max_sel = 0x1FF
 854        }
 855};
 856
 857/* Possible current values for fast-charging constant current phase */
 858static const struct linear_range fast_charge_current_ranges[] = {
 859        {
 860                .min = 0,
 861                .step = 64000,
 862                .min_sel = 0,
 863                .max_sel = 0xFF,
 864        }
 865};
 866
 867struct battery_init {
 868        const char *name;
 869        int *info_data;
 870        const struct linear_range *range;
 871        int ranges;
 872        u16 *data;
 873};
 874
 875struct dt_init {
 876        char *prop;
 877        const struct linear_range *range;
 878        int ranges;
 879        u16 *data;
 880};
 881
 882static int bd9995x_fw_probe(struct bd9995x_device *bd)
 883{
 884        int ret;
 885        struct power_supply_battery_info info;
 886        u32 property;
 887        int i;
 888        int regval;
 889        bool found;
 890        struct bd9995x_init_data *init = &bd->init_data;
 891        struct battery_init battery_inits[] = {
 892                {
 893                        .name = "trickle-charging current",
 894                        .info_data = &info.tricklecharge_current_ua,
 895                        .range = &charging_current_ranges[0],
 896                        .ranges = 2,
 897                        .data = &init->itrich_set,
 898                }, {
 899                        .name = "pre-charging current",
 900                        .info_data = &info.precharge_current_ua,
 901                        .range = &charging_current_ranges[0],
 902                        .ranges = 2,
 903                        .data = &init->iprech_set,
 904                }, {
 905                        .name = "pre-to-trickle charge voltage threshold",
 906                        .info_data = &info.precharge_voltage_max_uv,
 907                        .range = &trickle_to_pre_threshold_ranges[0],
 908                        .ranges = 2,
 909                        .data = &init->vprechg_th_set,
 910                }, {
 911                        .name = "charging termination current",
 912                        .info_data = &info.charge_term_current_ua,
 913                        .range = &charging_current_ranges[0],
 914                        .ranges = 2,
 915                        .data = &init->iterm_set,
 916                }, {
 917                        .name = "charging re-start voltage",
 918                        .info_data = &info.charge_restart_voltage_uv,
 919                        .range = &charge_voltage_regulation_ranges[0],
 920                        .ranges = 2,
 921                        .data = &init->vrechg_set,
 922                }, {
 923                        .name = "battery overvoltage limit",
 924                        .info_data = &info.overvoltage_limit_uv,
 925                        .range = &charge_voltage_regulation_ranges[0],
 926                        .ranges = 2,
 927                        .data = &init->vbatovp_set,
 928                }, {
 929                        .name = "fast-charging max current",
 930                        .info_data = &info.constant_charge_current_max_ua,
 931                        .range = &fast_charge_current_ranges[0],
 932                        .ranges = 1,
 933                        .data = &init->ichg_set,
 934                }, {
 935                        .name = "fast-charging voltage",
 936                        .info_data = &info.constant_charge_voltage_max_uv,
 937                        .range = &charge_voltage_regulation_ranges[0],
 938                        .ranges = 2,
 939                        .data = &init->vfastchg_reg_set1,
 940                },
 941        };
 942        struct dt_init props[] = {
 943                {
 944                        .prop = "rohm,vsys-regulation-microvolt",
 945                        .range = &vsys_voltage_regulation_ranges[0],
 946                        .ranges = 2,
 947                        .data = &init->vsysreg_set,
 948                }, {
 949                        .prop = "rohm,vbus-input-current-limit-microamp",
 950                        .range = &input_current_limit_ranges[0],
 951                        .ranges = 1,
 952                        .data = &init->ibus_lim_set,
 953                }, {
 954                        .prop = "rohm,vcc-input-current-limit-microamp",
 955                        .range = &input_current_limit_ranges[0],
 956                        .ranges = 1,
 957                        .data = &init->icc_lim_set,
 958                },
 959        };
 960
 961        /*
 962         * The power_supply_get_battery_info() does not support getting values
 963         * from ACPI. Let's fix it if ACPI is required here.
 964         */
 965        ret = power_supply_get_battery_info(bd->charger, &info);
 966        if (ret < 0)
 967                return ret;
 968
 969        for (i = 0; i < ARRAY_SIZE(battery_inits); i++) {
 970                int val = *battery_inits[i].info_data;
 971                const struct linear_range *range = battery_inits[i].range;
 972                int ranges = battery_inits[i].ranges;
 973
 974                if (val == -EINVAL)
 975                        continue;
 976
 977                ret = linear_range_get_selector_low_array(range, ranges, val,
 978                                                          &regval, &found);
 979                if (ret) {
 980                        dev_err(bd->dev, "Unsupported value for %s\n",
 981                                battery_inits[i].name);
 982
 983                        power_supply_put_battery_info(bd->charger, &info);
 984                        return -EINVAL;
 985                }
 986                if (!found) {
 987                        dev_warn(bd->dev,
 988                                 "Unsupported value for %s - using smaller\n",
 989                                 battery_inits[i].name);
 990                }
 991                *(battery_inits[i].data) = regval;
 992        }
 993
 994        power_supply_put_battery_info(bd->charger, &info);
 995
 996        for (i = 0; i < ARRAY_SIZE(props); i++) {
 997                ret = device_property_read_u32(bd->dev, props[i].prop,
 998                                               &property);
 999                if (ret < 0) {
1000                        dev_err(bd->dev, "failed to read %s", props[i].prop);

1001
1002                        return ret;
1003                }
1004
1005                ret = linear_range_get_selector_low_array(props[i].range,
1006                                                          props[i].ranges,
1007                                                          property, &regval,
1008                                                          &found);
1009                if (ret) {
1010                        dev_err(bd->dev, "Unsupported value for '%s'\n",
1011                                props[i].prop);
1012
1013                        return -EINVAL;
1014                }
1015
1016                if (!found) {
1017                        dev_warn(bd->dev,
1018                                 "Unsupported value for '%s' - using smaller\n",
1019                                 props[i].prop);
1020                }
1021
1022                *(props[i].data) = regval;
1023        }
1024
1025        return 0;
1026}
1027
1028static void bd9995x_chip_reset(void *bd)
1029{
1030        __bd9995x_chip_reset(bd);
1031}
1032
1033static int bd9995x_probe(struct i2c_client *client)
1034{
1035        struct device *dev = &client->dev;
1036        struct bd9995x_device *bd;
1037        struct power_supply_config psy_cfg = {};
1038        int ret;
1039        int i;
1040
1041        bd = devm_kzalloc(dev, sizeof(*bd), GFP_KERNEL);
1042        if (!bd)
1043                return -ENOMEM;
1044
1045        bd->client = client;
1046        bd->dev = dev;
1047        psy_cfg.drv_data = bd;
1048        psy_cfg.of_node = dev->of_node;
1049
1050        mutex_init(&bd->lock);
1051
1052        bd->rmap = devm_regmap_init_i2c(client, &bd9995x_regmap_config);
1053        if (IS_ERR(bd->rmap)) {
1054                dev_err(dev, "Failed to setup register access via i2c\n");
1055                return PTR_ERR(bd->rmap);
1056        }
1057
1058        for (i = 0; i < ARRAY_SIZE(bd9995x_reg_fields); i++) {
1059                const struct reg_field *reg_fields = bd9995x_reg_fields;
1060
1061                bd->rmap_fields[i] = devm_regmap_field_alloc(dev, bd->rmap,
1062                                                             reg_fields[i]);
1063                if (IS_ERR(bd->rmap_fields[i])) {
1064                        dev_err(dev, "cannot allocate regmap field\n");
1065                        return PTR_ERR(bd->rmap_fields[i]);
1066                }
1067        }
1068
1069        i2c_set_clientdata(client, bd);
1070
1071        ret = regmap_field_read(bd->rmap_fields[F_CHIP_ID], &bd->chip_id);
1072        if (ret) {
1073                dev_err(dev, "Cannot read chip ID.\n");
1074                return ret;
1075        }
1076
1077        if (bd->chip_id != BD99954_ID) {
1078                dev_err(dev, "Chip with ID=0x%x, not supported!\n",
1079                        bd->chip_id);
1080                return -ENODEV;
1081        }
1082
1083        ret = regmap_field_read(bd->rmap_fields[F_CHIP_REV], &bd->chip_rev);
1084        if (ret) {
1085                dev_err(dev, "Cannot read revision.\n");
1086                return ret;
1087        }
1088
1089        dev_info(bd->dev, "Found BD99954 chip rev %d\n", bd->chip_rev);
1090
1091        /*
1092         * We need to init the psy before we can call
1093         * power_supply_get_battery_info() for it
1094         */
1095        bd->charger = devm_power_supply_register(bd->dev,
1096                                                 &bd9995x_power_supply_desc,
1097                                                &psy_cfg);
1098        if (IS_ERR(bd->charger)) {
1099                dev_err(dev, "Failed to register power supply\n");
1100                return PTR_ERR(bd->charger);
1101        }
1102
1103        ret = bd9995x_fw_probe(bd);
1104        if (ret < 0) {
1105                dev_err(dev, "Cannot read device properties.\n");
1106                return ret;
1107        }
1108
1109        ret = bd9995x_hw_init(bd);
1110        if (ret < 0) {
1111                dev_err(dev, "Cannot initialize the chip.\n");
1112                return ret;
1113        }
1114
1115        ret = devm_add_action_or_reset(dev, bd9995x_chip_reset, bd);
1116        if (ret)
1117                return ret;
1118
1119        return devm_request_threaded_irq(dev, client->irq, NULL,
1120                                         bd9995x_irq_handler_thread,
1121                                         IRQF_TRIGGER_LOW | IRQF_ONESHOT,
1122                                         BD9995X_IRQ_PIN, bd);
1123}
1124
1125static const struct of_device_id bd9995x_of_match[] = {
1126        { .compatible = "rohm,bd99954", },
1127        { }
1128};
1129MODULE_DEVICE_TABLE(of, bd9995x_of_match);
1130
1131static struct i2c_driver bd9995x_driver = {
1132        .driver = {
1133                .name = "bd9995x-charger",
1134                .of_match_table = bd9995x_of_match,
1135        },
1136        .probe_new = bd9995x_probe,
1137};
1138module_i2c_driver(bd9995x_driver);
1139
1140MODULE_AUTHOR("Laine Markus <markus.laine@fi.rohmeurope.com>");
1141MODULE_DESCRIPTION("ROHM BD99954 charger driver");
1142MODULE_LICENSE("GPL");
1143