drivers/power/supply/bq25890_charger.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * TI BQ25890 charger driver
   4  *
   5  * Copyright (C) 2015 Intel Corporation
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/i2c.h>
  10 #include <linux/power_supply.h>
  11 #include <linux/regmap.h>
  12 #include <linux/types.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/delay.h>
  16 #include <linux/usb/phy.h>
  17
  18 #include <linux/acpi.h>
  19 #include <linux/of.h>
  20
  21 #define BQ25890_MANUFACTURER            "Texas Instruments"
  22 #define BQ25890_IRQ_PIN                 "bq25890_irq"
  23
  24 #define BQ25890_ID                      3
  25 #define BQ25895_ID                      7
  26 #define BQ25896_ID                      0
  27
  28 enum bq25890_chip_version {
  29         BQ25890,
  30         BQ25892,
  31         BQ25895,
  32         BQ25896,
  33 };
  34
  35 static const char *const bq25890_chip_name[] = {
  36         "BQ25890",
  37         "BQ25892",
  38         "BQ25895",
  39         "BQ25896",
  40 };
  41
  42 enum bq25890_fields {
  43         F_EN_HIZ, F_EN_ILIM, F_IILIM,                                /* Reg00 */
  44         F_BHOT, F_BCOLD, F_VINDPM_OFS,                               /* Reg01 */
  45         F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN,
  46         F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN,          /* Reg02 */
  47         F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN,
  48         F_MIN_VBAT_SEL,                                              /* Reg03 */
  49         F_PUMPX_EN, F_ICHG,                                          /* Reg04 */
  50         F_IPRECHG, F_ITERM,                                          /* Reg05 */
  51         F_VREG, F_BATLOWV, F_VRECHG,                                 /* Reg06 */
  52         F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR,
  53         F_JEITA_ISET,                                                /* Reg07 */
  54         F_BATCMP, F_VCLAMP, F_TREG,                                  /* Reg08 */
  55         F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET,
  56         F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN,       /* Reg09 */
  57         F_BOOSTV, F_PFM_OTG_DIS, F_BOOSTI,                           /* Reg0A */
  58         F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_0B_RSVD,
  59         F_VSYS_STAT,                                                 /* Reg0B */
  60         F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT,
  61         F_NTC_FAULT,                                                 /* Reg0C */
  62         F_FORCE_VINDPM, F_VINDPM,                                    /* Reg0D */
  63         F_THERM_STAT, F_BATV,                                        /* Reg0E */
  64         F_SYSV,                                                      /* Reg0F */
  65         F_TSPCT,                                                     /* Reg10 */
  66         F_VBUS_GD, F_VBUSV,                                          /* Reg11 */
  67         F_ICHGR,                                                     /* Reg12 */
  68         F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM,                        /* Reg13 */
  69         F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV,   /* Reg14 */
  70
  71         F_MAX_FIELDS
  72 };
  73
  74 /* initial field values, converted to register values */
  75 struct bq25890_init_data {
  76         u8 ichg;        /* charge current               */
  77         u8 vreg;        /* regulation voltage           */
  78         u8 iterm;       /* termination current          */
  79         u8 iprechg;     /* precharge current            */
  80         u8 sysvmin;     /* minimum system voltage limit */
  81         u8 boostv;      /* boost regulation voltage     */
  82         u8 boosti;      /* boost current limit          */
  83         u8 boostf;      /* boost frequency              */
  84         u8 ilim_en;     /* enable ILIM pin              */
  85         u8 treg;        /* thermal regulation threshold */
  86         u8 rbatcomp;    /* IBAT sense resistor value    */
  87         u8 vclamp;      /* IBAT compensation voltage limit */
  88 };
  89
  90 struct bq25890_state {
  91         u8 online;
  92         u8 chrg_status;
  93         u8 chrg_fault;
  94         u8 vsys_status;
  95         u8 boost_fault;
  96         u8 bat_fault;
  97 };
  98
  99 struct bq25890_device {
 100         struct i2c_client *client;
 101         struct device *dev;
 102         struct power_supply *charger;
 103
 104         struct usb_phy *usb_phy;
 105         struct notifier_block usb_nb;
 106         struct work_struct usb_work;
 107         unsigned long usb_event;
 108
 109         struct regmap *rmap;
 110         struct regmap_field *rmap_fields[F_MAX_FIELDS];
 111
 112         enum bq25890_chip_version chip_version;
 113         struct bq25890_init_data init_data;
 114         struct bq25890_state state;
 115
 116         struct mutex lock; /* protect state data */
 117 };
 118
 119 static const struct regmap_range bq25890_readonly_reg_ranges[] = {
 120         regmap_reg_range(0x0b, 0x0c),
 121         regmap_reg_range(0x0e, 0x13),
 122 };
 123
 124 static const struct regmap_access_table bq25890_writeable_regs = {
 125         .no_ranges = bq25890_readonly_reg_ranges,
 126         .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges),
 127 };
 128
 129 static const struct regmap_range bq25890_volatile_reg_ranges[] = {
 130         regmap_reg_range(0x00, 0x00),
 131         regmap_reg_range(0x02, 0x02),
 132         regmap_reg_range(0x09, 0x09),
 133         regmap_reg_range(0x0b, 0x14),
 134 };
 135
 136 static const struct regmap_access_table bq25890_volatile_regs = {
 137         .yes_ranges = bq25890_volatile_reg_ranges,
 138         .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges),
 139 };
 140
 141 static const struct regmap_config bq25890_regmap_config = {
 142         .reg_bits = 8,
 143         .val_bits = 8,
 144
 145         .max_register = 0x14,
 146         .cache_type = REGCACHE_RBTREE,
 147
 148         .wr_table = &bq25890_writeable_regs,
 149         .volatile_table = &bq25890_volatile_regs,
 150 };
 151
 152 static const struct reg_field bq25890_reg_fields[] = {
 153         /* REG00 */
 154         [F_EN_HIZ]              = REG_FIELD(0x00, 7, 7),
 155         [F_EN_ILIM]             = REG_FIELD(0x00, 6, 6),
 156         [F_IILIM]               = REG_FIELD(0x00, 0, 5),
 157         /* REG01 */
 158         [F_BHOT]                = REG_FIELD(0x01, 6, 7),
 159         [F_BCOLD]               = REG_FIELD(0x01, 5, 5),
 160         [F_VINDPM_OFS]          = REG_FIELD(0x01, 0, 4),
 161         /* REG02 */
 162         [F_CONV_START]          = REG_FIELD(0x02, 7, 7),
 163         [F_CONV_RATE]           = REG_FIELD(0x02, 6, 6),
 164         [F_BOOSTF]              = REG_FIELD(0x02, 5, 5),
 165         [F_ICO_EN]              = REG_FIELD(0x02, 4, 4),
 166         [F_HVDCP_EN]            = REG_FIELD(0x02, 3, 3),  // reserved on BQ25896
 167         [F_MAXC_EN]             = REG_FIELD(0x02, 2, 2),  // reserved on BQ25896
 168         [F_FORCE_DPM]           = REG_FIELD(0x02, 1, 1),
 169         [F_AUTO_DPDM_EN]        = REG_FIELD(0x02, 0, 0),
 170         /* REG03 */
 171         [F_BAT_LOAD_EN]         = REG_FIELD(0x03, 7, 7),
 172         [F_WD_RST]              = REG_FIELD(0x03, 6, 6),
 173         [F_OTG_CFG]             = REG_FIELD(0x03, 5, 5),
 174         [F_CHG_CFG]             = REG_FIELD(0x03, 4, 4),
 175         [F_SYSVMIN]             = REG_FIELD(0x03, 1, 3),
 176         [F_MIN_VBAT_SEL]        = REG_FIELD(0x03, 0, 0), // BQ25896 only
 177         /* REG04 */
 178         [F_PUMPX_EN]            = REG_FIELD(0x04, 7, 7),
 179         [F_ICHG]                = REG_FIELD(0x04, 0, 6),
 180         /* REG05 */
 181         [F_IPRECHG]             = REG_FIELD(0x05, 4, 7),
 182         [F_ITERM]               = REG_FIELD(0x05, 0, 3),
 183         /* REG06 */
 184         [F_VREG]                = REG_FIELD(0x06, 2, 7),
 185         [F_BATLOWV]             = REG_FIELD(0x06, 1, 1),
 186         [F_VRECHG]              = REG_FIELD(0x06, 0, 0),
 187         /* REG07 */
 188         [F_TERM_EN]             = REG_FIELD(0x07, 7, 7),
 189         [F_STAT_DIS]            = REG_FIELD(0x07, 6, 6),
 190         [F_WD]                  = REG_FIELD(0x07, 4, 5),
 191         [F_TMR_EN]              = REG_FIELD(0x07, 3, 3),
 192         [F_CHG_TMR]             = REG_FIELD(0x07, 1, 2),
 193         [F_JEITA_ISET]          = REG_FIELD(0x07, 0, 0), // reserved on BQ25895
 194         /* REG08 */
 195         [F_BATCMP]              = REG_FIELD(0x08, 5, 7),
 196         [F_VCLAMP]              = REG_FIELD(0x08, 2, 4),
 197         [F_TREG]                = REG_FIELD(0x08, 0, 1),
 198         /* REG09 */
 199         [F_FORCE_ICO]           = REG_FIELD(0x09, 7, 7),
 200         [F_TMR2X_EN]            = REG_FIELD(0x09, 6, 6),
 201         [F_BATFET_DIS]          = REG_FIELD(0x09, 5, 5),
 202         [F_JEITA_VSET]          = REG_FIELD(0x09, 4, 4), // reserved on BQ25895
 203         [F_BATFET_DLY]          = REG_FIELD(0x09, 3, 3),
 204         [F_BATFET_RST_EN]       = REG_FIELD(0x09, 2, 2),
 205         [F_PUMPX_UP]            = REG_FIELD(0x09, 1, 1),
 206         [F_PUMPX_DN]            = REG_FIELD(0x09, 0, 0),
 207         /* REG0A */
 208         [F_BOOSTV]              = REG_FIELD(0x0A, 4, 7),
 209         [F_BOOSTI]              = REG_FIELD(0x0A, 0, 2), // reserved on BQ25895
 210         [F_PFM_OTG_DIS]         = REG_FIELD(0x0A, 3, 3), // BQ25896 only
 211         /* REG0B */
 212         [F_VBUS_STAT]           = REG_FIELD(0x0B, 5, 7),
 213         [F_CHG_STAT]            = REG_FIELD(0x0B, 3, 4),
 214         [F_PG_STAT]             = REG_FIELD(0x0B, 2, 2),
 215         [F_SDP_STAT]            = REG_FIELD(0x0B, 1, 1), // reserved on BQ25896
 216         [F_VSYS_STAT]           = REG_FIELD(0x0B, 0, 0),
 217         /* REG0C */
 218         [F_WD_FAULT]            = REG_FIELD(0x0C, 7, 7),
 219         [F_BOOST_FAULT]         = REG_FIELD(0x0C, 6, 6),
 220         [F_CHG_FAULT]           = REG_FIELD(0x0C, 4, 5),
 221         [F_BAT_FAULT]           = REG_FIELD(0x0C, 3, 3),
 222         [F_NTC_FAULT]           = REG_FIELD(0x0C, 0, 2),
 223         /* REG0D */
 224         [F_FORCE_VINDPM]        = REG_FIELD(0x0D, 7, 7),
 225         [F_VINDPM]              = REG_FIELD(0x0D, 0, 6),
 226         /* REG0E */
 227         [F_THERM_STAT]          = REG_FIELD(0x0E, 7, 7),
 228         [F_BATV]                = REG_FIELD(0x0E, 0, 6),
 229         /* REG0F */
 230         [F_SYSV]                = REG_FIELD(0x0F, 0, 6),
 231         /* REG10 */
 232         [F_TSPCT]               = REG_FIELD(0x10, 0, 6),
 233         /* REG11 */
 234         [F_VBUS_GD]             = REG_FIELD(0x11, 7, 7),
 235         [F_VBUSV]               = REG_FIELD(0x11, 0, 6),
 236         /* REG12 */
 237         [F_ICHGR]               = REG_FIELD(0x12, 0, 6),
 238         /* REG13 */
 239         [F_VDPM_STAT]           = REG_FIELD(0x13, 7, 7),
 240         [F_IDPM_STAT]           = REG_FIELD(0x13, 6, 6),
 241         [F_IDPM_LIM]            = REG_FIELD(0x13, 0, 5),
 242         /* REG14 */
 243         [F_REG_RST]             = REG_FIELD(0x14, 7, 7),
 244         [F_ICO_OPTIMIZED]       = REG_FIELD(0x14, 6, 6),
 245         [F_PN]                  = REG_FIELD(0x14, 3, 5),
 246         [F_TS_PROFILE]          = REG_FIELD(0x14, 2, 2),
 247         [F_DEV_REV]             = REG_FIELD(0x14, 0, 1)
 248 };
 249
 250 /*
 251  * Most of the val -> idx conversions can be computed, given the minimum,
 252  * maximum and the step between values. For the rest of conversions, we use
 253  * lookup tables.
 254  */
 255 enum bq25890_table_ids {
 256         /* range tables */
 257         TBL_ICHG,
 258         TBL_ITERM,
 259         TBL_IILIM,
 260         TBL_VREG,
 261         TBL_BOOSTV,
 262         TBL_SYSVMIN,
 263         TBL_VBATCOMP,
 264         TBL_RBATCOMP,
 265
 266         /* lookup tables */
 267         TBL_TREG,
 268         TBL_BOOSTI,
 269 };
 270
 271 /* Thermal Regulation Threshold lookup table, in degrees Celsius */
 272 static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 };
 273
 274 #define BQ25890_TREG_TBL_SIZE           ARRAY_SIZE(bq25890_treg_tbl)
 275
 276 /* Boost mode current limit lookup table, in uA */
 277 static const u32 bq25890_boosti_tbl[] = {
 278         500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000
 279 };
 280
 281 #define BQ25890_BOOSTI_TBL_SIZE         ARRAY_SIZE(bq25890_boosti_tbl)
 282
 283 struct bq25890_range {
 284         u32 min;
 285         u32 max;
 286         u32 step;
 287 };
 288
 289 struct bq25890_lookup {
 290         const u32 *tbl;
 291         u32 size;
 292 };
 293
 294 static const union {
 295         struct bq25890_range  rt;
 296         struct bq25890_lookup lt;
 297 } bq25890_tables[] = {
 298         /* range tables */
 299         /* TODO: BQ25896 has max ICHG 3008 mA */
 300         [TBL_ICHG] =    { .rt = {0,       5056000, 64000} },     /* uA */
 301         [TBL_ITERM] =   { .rt = {64000,   1024000, 64000} },     /* uA */
 302         [TBL_IILIM] =   { .rt = {100000,  3250000, 50000} },     /* uA */
 303         [TBL_VREG] =    { .rt = {3840000, 4608000, 16000} },     /* uV */
 304         [TBL_BOOSTV] =  { .rt = {4550000, 5510000, 64000} },     /* uV */
 305         [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} },    /* uV */
 306         [TBL_VBATCOMP] ={ .rt = {0,        224000, 32000} },     /* uV */
 307         [TBL_RBATCOMP] ={ .rt = {0,        140000, 20000} },     /* uOhm */
 308
 309         /* lookup tables */
 310         [TBL_TREG] =    { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
 311         [TBL_BOOSTI] =  { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} }
 312 };
 313
 314 static int bq25890_field_read(struct bq25890_device *bq,
 315                               enum bq25890_fields field_id)
 316 {
 317         int ret;
 318         int val;
 319
 320         ret = regmap_field_read(bq->rmap_fields[field_id], &val);
 321         if (ret < 0)
 322                 return ret;
 323
 324         return val;
 325 }
 326
 327 static int bq25890_field_write(struct bq25890_device *bq,
 328                                enum bq25890_fields field_id, u8 val)
 329 {
 330         return regmap_field_write(bq->rmap_fields[field_id], val);
 331 }
 332
 333 static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id)
 334 {
 335         u8 idx;
 336
 337         if (id >= TBL_TREG) {
 338                 const u32 *tbl = bq25890_tables[id].lt.tbl;
 339                 u32 tbl_size = bq25890_tables[id].lt.size;
 340
 341                 for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++)
 342                         ;
 343         } else {
 344                 const struct bq25890_range *rtbl = &bq25890_tables[id].rt;
 345                 u8 rtbl_size;
 346
 347                 rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1;
 348
 349                 for (idx = 1;
 350                      idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value);
 351                      idx++)
 352                         ;
 353         }
 354
 355         return idx - 1;
 356 }
 357
 358 static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id)
 359 {
 360         const struct bq25890_range *rtbl;
 361
 362         /* lookup table? */
 363         if (id >= TBL_TREG)
 364                 return bq25890_tables[id].lt.tbl[idx];
 365
 366         /* range table */
 367         rtbl = &bq25890_tables[id].rt;
 368
 369         return (rtbl->min + idx * rtbl->step);
 370 }
 371
 372 enum bq25890_status {
 373         STATUS_NOT_CHARGING,
 374         STATUS_PRE_CHARGING,
 375         STATUS_FAST_CHARGING,
 376         STATUS_TERMINATION_DONE,
 377 };
 378
 379 enum bq25890_chrg_fault {
 380         CHRG_FAULT_NORMAL,
 381         CHRG_FAULT_INPUT,
 382         CHRG_FAULT_THERMAL_SHUTDOWN,
 383         CHRG_FAULT_TIMER_EXPIRED,
 384 };
 385
 386 static bool bq25890_is_adc_property(enum power_supply_property psp)
 387 {
 388         switch (psp) {
 389         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 390         case POWER_SUPPLY_PROP_CURRENT_NOW:
 391                 return true;
 392
 393         default:
 394                 return false;
 395         }
 396 }
 397
 398 static irqreturn_t __bq25890_handle_irq(struct bq25890_device *bq);
 399
 400 static int bq25890_power_supply_get_property(struct power_supply *psy,
 401                                              enum power_supply_property psp,
 402                                              union power_supply_propval *val)
 403 {
 404         struct bq25890_device *bq = power_supply_get_drvdata(psy);
 405         struct bq25890_state state;
 406         bool do_adc_conv;
 407         int ret;
 408
 409         mutex_lock(&bq->lock);
 410         /* update state in case we lost an interrupt */
 411         __bq25890_handle_irq(bq);
 412         state = bq->state;
 413         do_adc_conv = !state.online && bq25890_is_adc_property(psp);
 414         if (do_adc_conv)
 415                 bq25890_field_write(bq, F_CONV_START, 1);
 416         mutex_unlock(&bq->lock);
 417
 418         if (do_adc_conv)
 419                 regmap_field_read_poll_timeout(bq->rmap_fields[F_CONV_START],
 420                         ret, !ret, 25000, 1000000);
 421
 422         switch (psp) {
 423         case POWER_SUPPLY_PROP_STATUS:
 424                 if (!state.online)
 425                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 426                 else if (state.chrg_status == STATUS_NOT_CHARGING)
 427                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 428                 else if (state.chrg_status == STATUS_PRE_CHARGING ||
 429                          state.chrg_status == STATUS_FAST_CHARGING)
 430                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 431                 else if (state.chrg_status == STATUS_TERMINATION_DONE)
 432                         val->intval = POWER_SUPPLY_STATUS_FULL;
 433                 else
 434                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 435
 436                 break;
 437
 438         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 439                 if (!state.online || state.chrg_status == STATUS_NOT_CHARGING ||
 440                     state.chrg_status == STATUS_TERMINATION_DONE)
 441                         val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
 442                 else if (state.chrg_status == STATUS_PRE_CHARGING)
 443                         val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
 444                 else if (state.chrg_status == STATUS_FAST_CHARGING)
 445                         val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
 446                 else /* unreachable */
 447                         val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
 448                 break;
 449
 450         case POWER_SUPPLY_PROP_MANUFACTURER:
 451                 val->strval = BQ25890_MANUFACTURER;
 452                 break;
 453
 454         case POWER_SUPPLY_PROP_MODEL_NAME:
 455                 val->strval = bq25890_chip_name[bq->chip_version];
 456                 break;
 457
 458         case POWER_SUPPLY_PROP_ONLINE:
 459                 val->intval = state.online;
 460                 break;
 461
 462         case POWER_SUPPLY_PROP_HEALTH:
 463                 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault)
 464                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 465                 else if (state.bat_fault)
 466                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 467                 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED)
 468                         val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
 469                 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN)
 470                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 471                 else
 472                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 473                 break;
 474
 475         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 476                 val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG);
 477                 break;
 478
 479         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 480                 if (!state.online) {
 481                         val->intval = 0;
 482                         break;
 483                 }
 484
 485                 ret = bq25890_field_read(bq, F_BATV); /* read measured value */
 486                 if (ret < 0)
 487                         return ret;
 488
 489                 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
 490                 val->intval = 2304000 + ret * 20000;
 491                 break;
 492
 493         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 494                 val->intval = bq25890_find_val(bq->init_data.vreg, TBL_VREG);
 495                 break;
 496
 497         case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 498                 val->intval = bq25890_find_val(bq->init_data.iprechg, TBL_ITERM);
 499                 break;
 500
 501         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 502                 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
 503                 break;
 504
 505         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 506                 ret = bq25890_field_read(bq, F_IILIM);
 507                 if (ret < 0)
 508                         return ret;
 509
 510                 val->intval = bq25890_find_val(ret, TBL_IILIM);
 511                 break;
 512
 513         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 514                 ret = bq25890_field_read(bq, F_SYSV); /* read measured value */
 515                 if (ret < 0)
 516                         return ret;
 517
 518                 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
 519                 val->intval = 2304000 + ret * 20000;
 520                 break;
 521
 522         case POWER_SUPPLY_PROP_CURRENT_NOW:
 523                 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */
 524                 if (ret < 0)
 525                         return ret;
 526
 527                 /* converted_val = ADC_val * 50mA (table 10.3.19) */
 528                 val->intval = ret * -50000;
 529                 break;
 530
 531         default:
 532                 return -EINVAL;
 533         }
 534
 535         return 0;
 536 }
 537
 538 static int bq25890_get_chip_state(struct bq25890_device *bq,
 539                                   struct bq25890_state *state)
 540 {
 541         int i, ret;
 542
 543         struct {
 544                 enum bq25890_fields id;
 545                 u8 *data;
 546         } state_fields[] = {
 547                 {F_CHG_STAT,    &state->chrg_status},
 548                 {F_PG_STAT,     &state->online},
 549                 {F_VSYS_STAT,   &state->vsys_status},
 550                 {F_BOOST_FAULT, &state->boost_fault},
 551                 {F_BAT_FAULT,   &state->bat_fault},
 552                 {F_CHG_FAULT,   &state->chrg_fault}
 553         };
 554
 555         for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
 556                 ret = bq25890_field_read(bq, state_fields[i].id);
 557                 if (ret < 0)
 558                         return ret;
 559
 560                 *state_fields[i].data = ret;
 561         }
 562
 563         dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
 564                 state->chrg_status, state->online, state->vsys_status,
 565                 state->chrg_fault, state->boost_fault, state->bat_fault);
 566
 567         return 0;
 568 }
 569
 570 static irqreturn_t __bq25890_handle_irq(struct bq25890_device *bq)
 571 {
 572         struct bq25890_state new_state;
 573         int ret;
 574
 575         ret = bq25890_get_chip_state(bq, &new_state);
 576         if (ret < 0)
 577                 return IRQ_NONE;
 578
 579         if (!memcmp(&bq->state, &new_state, sizeof(new_state)))
 580                 return IRQ_NONE;
 581
 582         if (!new_state.online && bq->state.online) {        /* power removed */
 583                 /* disable ADC */
 584                 ret = bq25890_field_write(bq, F_CONV_START, 0);
 585                 if (ret < 0)
 586                         goto error;
 587         } else if (new_state.online && !bq->state.online) { /* power inserted */
 588                 /* enable ADC, to have control of charge current/voltage */
 589                 ret = bq25890_field_write(bq, F_CONV_START, 1);
 590                 if (ret < 0)
 591                         goto error;
 592         }
 593
 594         bq->state = new_state;
 595         power_supply_changed(bq->charger);
 596
 597         return IRQ_HANDLED;
 598 error:
 599         dev_err(bq->dev, "Error communicating with the chip: %pe\n",
 600                 ERR_PTR(ret));
 601         return IRQ_HANDLED;
 602 }
 603
 604 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private)
 605 {
 606         struct bq25890_device *bq = private;
 607         irqreturn_t ret;
 608
 609         mutex_lock(&bq->lock);
 610         ret = __bq25890_handle_irq(bq);
 611         mutex_unlock(&bq->lock);
 612
 613         return ret;
 614 }
 615
 616 static int bq25890_chip_reset(struct bq25890_device *bq)
 617 {
 618         int ret;
 619         int rst_check_counter = 10;
 620
 621         ret = bq25890_field_write(bq, F_REG_RST, 1);
 622         if (ret < 0)
 623                 return ret;
 624
 625         do {
 626                 ret = bq25890_field_read(bq, F_REG_RST);
 627                 if (ret < 0)
 628                         return ret;
 629
 630                 usleep_range(5, 10);
 631         } while (ret == 1 && --rst_check_counter);
 632
 633         if (!rst_check_counter)
 634                 return -ETIMEDOUT;
 635
 636         return 0;
 637 }
 638
 639 static int bq25890_hw_init(struct bq25890_device *bq)
 640 {
 641         int ret;
 642         int i;
 643
 644         const struct {
 645                 enum bq25890_fields id;
 646                 u32 value;
 647         } init_data[] = {
 648                 {F_ICHG,         bq->init_data.ichg},
 649                 {F_VREG,         bq->init_data.vreg},
 650                 {F_ITERM,        bq->init_data.iterm},
 651                 {F_IPRECHG,      bq->init_data.iprechg},
 652                 {F_SYSVMIN,      bq->init_data.sysvmin},
 653                 {F_BOOSTV,       bq->init_data.boostv},
 654                 {F_BOOSTI,       bq->init_data.boosti},
 655                 {F_BOOSTF,       bq->init_data.boostf},
 656                 {F_EN_ILIM,      bq->init_data.ilim_en},
 657                 {F_TREG,         bq->init_data.treg},
 658                 {F_BATCMP,       bq->init_data.rbatcomp},
 659                 {F_VCLAMP,       bq->init_data.vclamp},
 660         };
 661
 662         ret = bq25890_chip_reset(bq);
 663         if (ret < 0) {
 664                 dev_dbg(bq->dev, "Reset failed %d\n", ret);
 665                 return ret;
 666         }
 667
 668         /* disable watchdog */
 669         ret = bq25890_field_write(bq, F_WD, 0);
 670         if (ret < 0) {
 671                 dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret);
 672                 return ret;
 673         }
 674
 675         /* initialize currents/voltages and other parameters */
 676         for (i = 0; i < ARRAY_SIZE(init_data); i++) {
 677                 ret = bq25890_field_write(bq, init_data[i].id,
 678                                           init_data[i].value);
 679                 if (ret < 0) {
 680                         dev_dbg(bq->dev, "Writing init data failed %d\n", ret);
 681                         return ret;
 682                 }
 683         }
 684
 685         /* Configure ADC for continuous conversions when charging */
 686         ret = bq25890_field_write(bq, F_CONV_RATE, !!bq->state.online);
 687         if (ret < 0) {
 688                 dev_dbg(bq->dev, "Config ADC failed %d\n", ret);
 689                 return ret;
 690         }
 691
 692         ret = bq25890_get_chip_state(bq, &bq->state);
 693         if (ret < 0) {
 694                 dev_dbg(bq->dev, "Get state failed %d\n", ret);
 695                 return ret;
 696         }
 697
 698         return 0;
 699 }
 700
 701 static const enum power_supply_property bq25890_power_supply_props[] = {
 702         POWER_SUPPLY_PROP_MANUFACTURER,
 703         POWER_SUPPLY_PROP_MODEL_NAME,
 704         POWER_SUPPLY_PROP_STATUS,
 705         POWER_SUPPLY_PROP_CHARGE_TYPE,
 706         POWER_SUPPLY_PROP_ONLINE,
 707         POWER_SUPPLY_PROP_HEALTH,
 708         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 709         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 710         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 711         POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
 712         POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 713         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 714         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 715         POWER_SUPPLY_PROP_CURRENT_NOW,
 716 };
 717
 718 static char *bq25890_charger_supplied_to[] = {
 719         "main-battery",
 720 };
 721
 722 static const struct power_supply_desc bq25890_power_supply_desc = {
 723         .name = "bq25890-charger",
 724         .type = POWER_SUPPLY_TYPE_USB,
 725         .properties = bq25890_power_supply_props,
 726         .num_properties = ARRAY_SIZE(bq25890_power_supply_props),
 727         .get_property = bq25890_power_supply_get_property,
 728 };
 729
 730 static int bq25890_power_supply_init(struct bq25890_device *bq)
 731 {
 732         struct power_supply_config psy_cfg = { .drv_data = bq, };
 733
 734         psy_cfg.supplied_to = bq25890_charger_supplied_to;
 735         psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to);
 736
 737         bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc,
 738                                             &psy_cfg);
 739
 740         return PTR_ERR_OR_ZERO(bq->charger);
 741 }
 742
 743 static void bq25890_usb_work(struct work_struct *data)
 744 {
 745         int ret;
 746         struct bq25890_device *bq =
 747                         container_of(data, struct bq25890_device, usb_work);
 748
 749         switch (bq->usb_event) {
 750         case USB_EVENT_ID:
 751                 /* Enable boost mode */
 752                 ret = bq25890_field_write(bq, F_OTG_CFG, 1);
 753                 if (ret < 0)
 754                         goto error;
 755                 break;
 756
 757         case USB_EVENT_NONE:
 758                 /* Disable boost mode */
 759                 ret = bq25890_field_write(bq, F_OTG_CFG, 0);
 760                 if (ret < 0)
 761                         goto error;
 762
 763                 power_supply_changed(bq->charger);
 764                 break;
 765         }
 766
 767         return;
 768
 769 error:
 770         dev_err(bq->dev, "Error switching to boost/charger mode.\n");
 771 }
 772
 773 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
 774                                 void *priv)
 775 {
 776         struct bq25890_device *bq =
 777                         container_of(nb, struct bq25890_device, usb_nb);
 778
 779         bq->usb_event = val;
 780         queue_work(system_power_efficient_wq, &bq->usb_work);
 781
 782         return NOTIFY_OK;
 783 }
 784
 785 static int bq25890_get_chip_version(struct bq25890_device *bq)
 786 {
 787         int id, rev;
 788
 789         id = bq25890_field_read(bq, F_PN);
 790         if (id < 0) {
 791                 dev_err(bq->dev, "Cannot read chip ID.\n");
 792                 return id;
 793         }
 794
 795         rev = bq25890_field_read(bq, F_DEV_REV);
 796         if (rev < 0) {
 797                 dev_err(bq->dev, "Cannot read chip revision.\n");
 798                 return rev;
 799         }
 800
 801         switch (id) {
 802         case BQ25890_ID:
 803                 bq->chip_version = BQ25890;
 804                 break;
 805
 806         /* BQ25892 and BQ25896 share same ID 0 */
 807         case BQ25896_ID:
 808                 switch (rev) {
 809                 case 2:
 810                         bq->chip_version = BQ25896;
 811                         break;
 812                 case 1:
 813                         bq->chip_version = BQ25892;
 814                         break;
 815                 default:
 816                         dev_err(bq->dev,
 817                                 "Unknown device revision %d, assume BQ25892\n",
 818                                 rev);
 819                         bq->chip_version = BQ25892;
 820                 }
 821                 break;
 822
 823         case BQ25895_ID:
 824                 bq->chip_version = BQ25895;
 825                 break;
 826
 827         default:
 828                 dev_err(bq->dev, "Unknown chip ID %d\n", id);
 829                 return -ENODEV;
 830         }
 831
 832         return 0;
 833 }
 834
 835 static int bq25890_irq_probe(struct bq25890_device *bq)
 836 {
 837         struct gpio_desc *irq;
 838
 839         irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN);
 840         if (IS_ERR(irq)) {
 841                 dev_err(bq->dev, "Could not probe irq pin.\n");
 842                 return PTR_ERR(irq);
 843         }
 844
 845         return gpiod_to_irq(irq);
 846 }
 847
 848 static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
 849 {
 850         int ret;
 851         u32 property;
 852         int i;
 853         struct bq25890_init_data *init = &bq->init_data;
 854         struct {
 855                 char *name;
 856                 bool optional;
 857                 enum bq25890_table_ids tbl_id;
 858                 u8 *conv_data; /* holds converted value from given property */
 859         } props[] = {
 860                 /* required properties */
 861                 {"ti,charge-current", false, TBL_ICHG, &init->ichg},
 862                 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg},
 863                 {"ti,termination-current", false, TBL_ITERM, &init->iterm},
 864                 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg},
 865                 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin},
 866                 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv},
 867                 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},
 868
 869                 /* optional properties */
 870                 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg},
 871                 {"ti,ibatcomp-micro-ohms", true, TBL_RBATCOMP, &init->rbatcomp},
 872                 {"ti,ibatcomp-clamp-microvolt", true, TBL_VBATCOMP, &init->vclamp},
 873         };
 874
 875         /* initialize data for optional properties */
 876         init->treg = 3; /* 120 degrees Celsius */
 877         init->rbatcomp = init->vclamp = 0; /* IBAT compensation disabled */
 878
 879         for (i = 0; i < ARRAY_SIZE(props); i++) {
 880                 ret = device_property_read_u32(bq->dev, props[i].name,
 881                                                &property);
 882                 if (ret < 0) {
 883                         if (props[i].optional)
 884                                 continue;
 885
 886                         dev_err(bq->dev, "Unable to read property %d %s\n", ret,
 887                                 props[i].name);
 888
 889                         return ret;
 890                 }
 891
 892                 *props[i].conv_data = bq25890_find_idx(property,
 893                                                        props[i].tbl_id);
 894         }
 895
 896         return 0;
 897 }
 898
 899 static int bq25890_fw_probe(struct bq25890_device *bq)
 900 {
 901         int ret;
 902         struct bq25890_init_data *init = &bq->init_data;
 903
 904         ret = bq25890_fw_read_u32_props(bq);
 905         if (ret < 0)
 906                 return ret;
 907
 908         init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
 909         init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");
 910
 911         return 0;
 912 }
 913
 914 static int bq25890_probe(struct i2c_client *client,
 915                          const struct i2c_device_id *id)
 916 {
 917         struct device *dev = &client->dev;
 918         struct bq25890_device *bq;
 919         int ret;
 920         int i;
 921
 922         bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
 923         if (!bq)
 924                 return -ENOMEM;
 925
 926         bq->client = client;
 927         bq->dev = dev;
 928
 929         mutex_init(&bq->lock);
 930
 931         bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config);
 932         if (IS_ERR(bq->rmap)) {
 933                 dev_err(dev, "failed to allocate register map\n");
 934                 return PTR_ERR(bq->rmap);
 935         }
 936
 937         for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) {
 938                 const struct reg_field *reg_fields = bq25890_reg_fields;
 939
 940                 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap,
 941                                                              reg_fields[i]);
 942                 if (IS_ERR(bq->rmap_fields[i])) {
 943                         dev_err(dev, "cannot allocate regmap field\n");
 944                         return PTR_ERR(bq->rmap_fields[i]);
 945                 }
 946         }
 947
 948         i2c_set_clientdata(client, bq);
 949
 950         ret = bq25890_get_chip_version(bq);
 951         if (ret) {
 952                 dev_err(dev, "Cannot read chip ID or unknown chip.\n");
 953                 return ret;
 954         }
 955
 956         if (!dev->platform_data) {
 957                 ret = bq25890_fw_probe(bq);
 958                 if (ret < 0) {
 959                         dev_err(dev, "Cannot read device properties.\n");
 960                         return ret;
 961                 }
 962         } else {
 963                 return -ENODEV;
 964         }
 965
 966         ret = bq25890_hw_init(bq);
 967         if (ret < 0) {
 968                 dev_err(dev, "Cannot initialize the chip.\n");
 969                 return ret;
 970         }
 971
 972         if (client->irq <= 0)
 973                 client->irq = bq25890_irq_probe(bq);
 974
 975         if (client->irq < 0) {
 976                 dev_err(dev, "No irq resource found.\n");
 977                 return client->irq;
 978         }
 979
 980         /* OTG reporting */
 981         bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 982         if (!IS_ERR_OR_NULL(bq->usb_phy)) {
 983                 INIT_WORK(&bq->usb_work, bq25890_usb_work);
 984                 bq->usb_nb.notifier_call = bq25890_usb_notifier;
 985                 usb_register_notifier(bq->usb_phy, &bq->usb_nb);
 986         }
 987
 988         ret = devm_request_threaded_irq(dev, client->irq, NULL,
 989                                         bq25890_irq_handler_thread,
 990                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 991                                         BQ25890_IRQ_PIN, bq);
 992         if (ret)
 993                 goto irq_fail;
 994
 995         ret = bq25890_power_supply_init(bq);
 996         if (ret < 0) {
 997                 dev_err(dev, "Failed to register power supply\n");
 998                 goto irq_fail;
 999         }
1000
1001         return 0;
1002
1003 irq_fail:
1004         if (!IS_ERR_OR_NULL(bq->usb_phy))
1005                 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
1006
1007         return ret;
1008 }
1009
1010 static int bq25890_remove(struct i2c_client *client)
1011 {
1012         struct bq25890_device *bq = i2c_get_clientdata(client);
1013
1014         power_supply_unregister(bq->charger);
1015
1016         if (!IS_ERR_OR_NULL(bq->usb_phy))
1017                 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
1018
1019         /* reset all registers to default values */
1020         bq25890_chip_reset(bq);
1021
1022         return 0;
1023 }
1024
1025 #ifdef CONFIG_PM_SLEEP
1026 static int bq25890_suspend(struct device *dev)
1027 {
1028         struct bq25890_device *bq = dev_get_drvdata(dev);
1029
1030         /*
1031          * If charger is removed, while in suspend, make sure ADC is diabled
1032          * since it consumes slightly more power.
1033          */
1034         return bq25890_field_write(bq, F_CONV_RATE, 0);
1035 }
1036
1037 static int bq25890_resume(struct device *dev)
1038 {
1039         int ret;
1040         struct bq25890_device *bq = dev_get_drvdata(dev);
1041
1042         mutex_lock(&bq->lock);
1043
1044         ret = bq25890_get_chip_state(bq, &bq->state);
1045         if (ret < 0)
1046                 goto unlock;
1047
1048         /* Re-enable ADC only if charger is plugged in. */
1049         if (bq->state.online) {
1050                 ret = bq25890_field_write(bq, F_CONV_RATE, 1);
1051                 if (ret < 0)
1052                         goto unlock;
1053         }
1054
1055         /* signal userspace, maybe state changed while suspended */
1056         power_supply_changed(bq->charger);
1057
1058 unlock:
1059         mutex_unlock(&bq->lock);
1060
1061         return ret;
1062 }
1063 #endif
1064
1065 static const struct dev_pm_ops bq25890_pm = {
1066         SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume)
1067 };
1068
1069 static const struct i2c_device_id bq25890_i2c_ids[] = {
1070         { "bq25890", 0 },
1071         { "bq25892", 0 },
1072         { "bq25895", 0 },
1073         { "bq25896", 0 },
1074         {},
1075 };
1076 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
1077
1078 static const struct of_device_id bq25890_of_match[] = {
1079         { .compatible = "ti,bq25890", },
1080         { .compatible = "ti,bq25892", },
1081         { .compatible = "ti,bq25895", },
1082         { .compatible = "ti,bq25896", },
1083         { },
1084 };
1085 MODULE_DEVICE_TABLE(of, bq25890_of_match);
1086
1087 #ifdef CONFIG_ACPI
1088 static const struct acpi_device_id bq25890_acpi_match[] = {
1089         {"BQ258900", 0},
1090         {},
1091 };
1092 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match);
1093 #endif
1094
1095 static struct i2c_driver bq25890_driver = {
1096         .driver = {
1097                 .name = "bq25890-charger",
1098                 .of_match_table = of_match_ptr(bq25890_of_match),
1099                 .acpi_match_table = ACPI_PTR(bq25890_acpi_match),
1100                 .pm = &bq25890_pm,
1101         },
1102         .probe = bq25890_probe,
1103         .remove = bq25890_remove,
1104         .id_table = bq25890_i2c_ids,
1105 };
1106 module_i2c_driver(bq25890_driver);
1107
1108 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>");
1109 MODULE_DESCRIPTION("bq25890 charger driver");
1110 MODULE_LICENSE("GPL");