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 BQ25896_ID                      0
  26
  27 enum bq25890_fields {
  28         F_EN_HIZ, F_EN_ILIM, F_IILIM,                                /* Reg00 */
  29         F_BHOT, F_BCOLD, F_VINDPM_OFS,                               /* Reg01 */
  30         F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN,
  31         F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN,          /* Reg02 */
  32         F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN,    /* Reg03 */
  33         F_PUMPX_EN, F_ICHG,                                          /* Reg04 */
  34         F_IPRECHG, F_ITERM,                                          /* Reg05 */
  35         F_VREG, F_BATLOWV, F_VRECHG,                                 /* Reg06 */
  36         F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR,
  37         F_JEITA_ISET,                                                /* Reg07 */
  38         F_BATCMP, F_VCLAMP, F_TREG,                                  /* Reg08 */
  39         F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET,
  40         F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN,       /* Reg09 */
  41         F_BOOSTV, F_BOOSTI,                                          /* Reg0A */
  42         F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */
  43         F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT,
  44         F_NTC_FAULT,                                                 /* Reg0C */
  45         F_FORCE_VINDPM, F_VINDPM,                                    /* Reg0D */
  46         F_THERM_STAT, F_BATV,                                        /* Reg0E */
  47         F_SYSV,                                                      /* Reg0F */
  48         F_TSPCT,                                                     /* Reg10 */
  49         F_VBUS_GD, F_VBUSV,                                          /* Reg11 */
  50         F_ICHGR,                                                     /* Reg12 */
  51         F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM,                        /* Reg13 */
  52         F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV,   /* Reg14 */
  53
  54         F_MAX_FIELDS
  55 };
  56
  57 /* initial field values, converted to register values */
  58 struct bq25890_init_data {
  59         u8 ichg;        /* charge current               */
  60         u8 vreg;        /* regulation voltage           */
  61         u8 iterm;       /* termination current          */
  62         u8 iprechg;     /* precharge current            */
  63         u8 sysvmin;     /* minimum system voltage limit */
  64         u8 boostv;      /* boost regulation voltage     */
  65         u8 boosti;      /* boost current limit          */
  66         u8 boostf;      /* boost frequency              */
  67         u8 ilim_en;     /* enable ILIM pin              */
  68         u8 treg;        /* thermal regulation threshold */
  69 };
  70
  71 struct bq25890_state {
  72         u8 online;
  73         u8 chrg_status;
  74         u8 chrg_fault;
  75         u8 vsys_status;
  76         u8 boost_fault;
  77         u8 bat_fault;
  78 };
  79
  80 struct bq25890_device {
  81         struct i2c_client *client;
  82         struct device *dev;
  83         struct power_supply *charger;
  84
  85         struct usb_phy *usb_phy;
  86         struct notifier_block usb_nb;
  87         struct work_struct usb_work;
  88         unsigned long usb_event;
  89
  90         struct regmap *rmap;
  91         struct regmap_field *rmap_fields[F_MAX_FIELDS];
  92
  93         int chip_id;
  94         struct bq25890_init_data init_data;
  95         struct bq25890_state state;
  96
  97         struct mutex lock; /* protect state data */
  98 };
  99
 100 static const struct regmap_range bq25890_readonly_reg_ranges[] = {
 101         regmap_reg_range(0x0b, 0x0c),
 102         regmap_reg_range(0x0e, 0x13),
 103 };
 104
 105 static const struct regmap_access_table bq25890_writeable_regs = {
 106         .no_ranges = bq25890_readonly_reg_ranges,
 107         .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges),
 108 };
 109
 110 static const struct regmap_range bq25890_volatile_reg_ranges[] = {
 111         regmap_reg_range(0x00, 0x00),
 112         regmap_reg_range(0x09, 0x09),
 113         regmap_reg_range(0x0b, 0x0c),
 114         regmap_reg_range(0x0e, 0x14),
 115 };
 116
 117 static const struct regmap_access_table bq25890_volatile_regs = {
 118         .yes_ranges = bq25890_volatile_reg_ranges,
 119         .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges),
 120 };
 121
 122 static const struct regmap_config bq25890_regmap_config = {
 123         .reg_bits = 8,
 124         .val_bits = 8,
 125
 126         .max_register = 0x14,
 127         .cache_type = REGCACHE_RBTREE,
 128
 129         .wr_table = &bq25890_writeable_regs,
 130         .volatile_table = &bq25890_volatile_regs,
 131 };
 132
 133 static const struct reg_field bq25890_reg_fields[] = {
 134         /* REG00 */
 135         [F_EN_HIZ]              = REG_FIELD(0x00, 7, 7),
 136         [F_EN_ILIM]             = REG_FIELD(0x00, 6, 6),
 137         [F_IILIM]               = REG_FIELD(0x00, 0, 5),
 138         /* REG01 */
 139         [F_BHOT]                = REG_FIELD(0x01, 6, 7),
 140         [F_BCOLD]               = REG_FIELD(0x01, 5, 5),
 141         [F_VINDPM_OFS]          = REG_FIELD(0x01, 0, 4),
 142         /* REG02 */
 143         [F_CONV_START]          = REG_FIELD(0x02, 7, 7),
 144         [F_CONV_RATE]           = REG_FIELD(0x02, 6, 6),
 145         [F_BOOSTF]              = REG_FIELD(0x02, 5, 5),
 146         [F_ICO_EN]              = REG_FIELD(0x02, 4, 4),
 147         [F_HVDCP_EN]            = REG_FIELD(0x02, 3, 3),  // reserved on BQ25896
 148         [F_MAXC_EN]             = REG_FIELD(0x02, 2, 2),  // reserved on BQ25896
 149         [F_FORCE_DPM]           = REG_FIELD(0x02, 1, 1),
 150         [F_AUTO_DPDM_EN]        = REG_FIELD(0x02, 0, 0),
 151         /* REG03 */
 152         [F_BAT_LOAD_EN]         = REG_FIELD(0x03, 7, 7),
 153         [F_WD_RST]              = REG_FIELD(0x03, 6, 6),
 154         [F_OTG_CFG]             = REG_FIELD(0x03, 5, 5),
 155         [F_CHG_CFG]             = REG_FIELD(0x03, 4, 4),
 156         [F_SYSVMIN]             = REG_FIELD(0x03, 1, 3),
 157         /* MIN_VBAT_SEL on BQ25896 */
 158         /* REG04 */
 159         [F_PUMPX_EN]            = REG_FIELD(0x04, 7, 7),
 160         [F_ICHG]                = REG_FIELD(0x04, 0, 6),
 161         /* REG05 */
 162         [F_IPRECHG]             = REG_FIELD(0x05, 4, 7),
 163         [F_ITERM]               = REG_FIELD(0x05, 0, 3),
 164         /* REG06 */
 165         [F_VREG]                = REG_FIELD(0x06, 2, 7),
 166         [F_BATLOWV]             = REG_FIELD(0x06, 1, 1),
 167         [F_VRECHG]              = REG_FIELD(0x06, 0, 0),
 168         /* REG07 */
 169         [F_TERM_EN]             = REG_FIELD(0x07, 7, 7),
 170         [F_STAT_DIS]            = REG_FIELD(0x07, 6, 6),
 171         [F_WD]                  = REG_FIELD(0x07, 4, 5),
 172         [F_TMR_EN]              = REG_FIELD(0x07, 3, 3),
 173         [F_CHG_TMR]             = REG_FIELD(0x07, 1, 2),
 174         [F_JEITA_ISET]          = REG_FIELD(0x07, 0, 0),
 175         /* REG08 */
 176         [F_BATCMP]              = REG_FIELD(0x08, 5, 7),
 177         [F_VCLAMP]              = REG_FIELD(0x08, 2, 4),
 178         [F_TREG]                = REG_FIELD(0x08, 0, 1),
 179         /* REG09 */
 180         [F_FORCE_ICO]           = REG_FIELD(0x09, 7, 7),
 181         [F_TMR2X_EN]            = REG_FIELD(0x09, 6, 6),
 182         [F_BATFET_DIS]          = REG_FIELD(0x09, 5, 5),
 183         [F_JEITA_VSET]          = REG_FIELD(0x09, 4, 4),
 184         [F_BATFET_DLY]          = REG_FIELD(0x09, 3, 3),
 185         [F_BATFET_RST_EN]       = REG_FIELD(0x09, 2, 2),
 186         [F_PUMPX_UP]            = REG_FIELD(0x09, 1, 1),
 187         [F_PUMPX_DN]            = REG_FIELD(0x09, 0, 0),
 188         /* REG0A */
 189         [F_BOOSTV]              = REG_FIELD(0x0A, 4, 7),
 190         /* PFM_OTG_DIS 3 on BQ25896 */
 191         [F_BOOSTI]              = REG_FIELD(0x0A, 0, 2),
 192         /* REG0B */
 193         [F_VBUS_STAT]           = REG_FIELD(0x0B, 5, 7),
 194         [F_CHG_STAT]            = REG_FIELD(0x0B, 3, 4),
 195         [F_PG_STAT]             = REG_FIELD(0x0B, 2, 2),
 196         [F_SDP_STAT]            = REG_FIELD(0x0B, 1, 1), // reserved on BQ25896
 197         [F_VSYS_STAT]           = REG_FIELD(0x0B, 0, 0),
 198         /* REG0C */
 199         [F_WD_FAULT]            = REG_FIELD(0x0C, 7, 7),
 200         [F_BOOST_FAULT]         = REG_FIELD(0x0C, 6, 6),
 201         [F_CHG_FAULT]           = REG_FIELD(0x0C, 4, 5),
 202         [F_BAT_FAULT]           = REG_FIELD(0x0C, 3, 3),
 203         [F_NTC_FAULT]           = REG_FIELD(0x0C, 0, 2),
 204         /* REG0D */
 205         [F_FORCE_VINDPM]        = REG_FIELD(0x0D, 7, 7),
 206         [F_VINDPM]              = REG_FIELD(0x0D, 0, 6),
 207         /* REG0E */
 208         [F_THERM_STAT]          = REG_FIELD(0x0E, 7, 7),
 209         [F_BATV]                = REG_FIELD(0x0E, 0, 6),
 210         /* REG0F */
 211         [F_SYSV]                = REG_FIELD(0x0F, 0, 6),
 212         /* REG10 */
 213         [F_TSPCT]               = REG_FIELD(0x10, 0, 6),
 214         /* REG11 */
 215         [F_VBUS_GD]             = REG_FIELD(0x11, 7, 7),
 216         [F_VBUSV]               = REG_FIELD(0x11, 0, 6),
 217         /* REG12 */
 218         [F_ICHGR]               = REG_FIELD(0x12, 0, 6),
 219         /* REG13 */
 220         [F_VDPM_STAT]           = REG_FIELD(0x13, 7, 7),
 221         [F_IDPM_STAT]           = REG_FIELD(0x13, 6, 6),
 222         [F_IDPM_LIM]            = REG_FIELD(0x13, 0, 5),
 223         /* REG14 */
 224         [F_REG_RST]             = REG_FIELD(0x14, 7, 7),
 225         [F_ICO_OPTIMIZED]       = REG_FIELD(0x14, 6, 6),
 226         [F_PN]                  = REG_FIELD(0x14, 3, 5),
 227         [F_TS_PROFILE]          = REG_FIELD(0x14, 2, 2),
 228         [F_DEV_REV]             = REG_FIELD(0x14, 0, 1)
 229 };
 230
 231 /*
 232  * Most of the val -> idx conversions can be computed, given the minimum,
 233  * maximum and the step between values. For the rest of conversions, we use
 234  * lookup tables.
 235  */
 236 enum bq25890_table_ids {
 237         /* range tables */
 238         TBL_ICHG,
 239         TBL_ITERM,
 240         TBL_VREG,
 241         TBL_BOOSTV,
 242         TBL_SYSVMIN,
 243
 244         /* lookup tables */
 245         TBL_TREG,
 246         TBL_BOOSTI,
 247 };
 248
 249 /* Thermal Regulation Threshold lookup table, in degrees Celsius */
 250 static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 };
 251
 252 #define BQ25890_TREG_TBL_SIZE           ARRAY_SIZE(bq25890_treg_tbl)
 253
 254 /* Boost mode current limit lookup table, in uA */
 255 static const u32 bq25890_boosti_tbl[] = {
 256         500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000
 257 };
 258
 259 #define BQ25890_BOOSTI_TBL_SIZE         ARRAY_SIZE(bq25890_boosti_tbl)
 260
 261 struct bq25890_range {
 262         u32 min;
 263         u32 max;
 264         u32 step;
 265 };
 266
 267 struct bq25890_lookup {
 268         const u32 *tbl;
 269         u32 size;
 270 };
 271
 272 static const union {
 273         struct bq25890_range  rt;
 274         struct bq25890_lookup lt;
 275 } bq25890_tables[] = {
 276         /* range tables */
 277         [TBL_ICHG] =    { .rt = {0,       5056000, 64000} },     /* uA */
 278         [TBL_ITERM] =   { .rt = {64000,   1024000, 64000} },     /* uA */
 279         [TBL_VREG] =    { .rt = {3840000, 4608000, 16000} },     /* uV */
 280         [TBL_BOOSTV] =  { .rt = {4550000, 5510000, 64000} },     /* uV */
 281         [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} },    /* uV */
 282
 283         /* lookup tables */
 284         [TBL_TREG] =    { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
 285         [TBL_BOOSTI] =  { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} }
 286 };
 287
 288 static int bq25890_field_read(struct bq25890_device *bq,
 289                               enum bq25890_fields field_id)
 290 {
 291         int ret;
 292         int val;
 293
 294         ret = regmap_field_read(bq->rmap_fields[field_id], &val);
 295         if (ret < 0)
 296                 return ret;
 297
 298         return val;
 299 }
 300
 301 static int bq25890_field_write(struct bq25890_device *bq,
 302                                enum bq25890_fields field_id, u8 val)
 303 {
 304         return regmap_field_write(bq->rmap_fields[field_id], val);
 305 }
 306
 307 static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id)
 308 {
 309         u8 idx;
 310
 311         if (id >= TBL_TREG) {
 312                 const u32 *tbl = bq25890_tables[id].lt.tbl;
 313                 u32 tbl_size = bq25890_tables[id].lt.size;
 314
 315                 for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++)
 316                         ;
 317         } else {
 318                 const struct bq25890_range *rtbl = &bq25890_tables[id].rt;
 319                 u8 rtbl_size;
 320
 321                 rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1;
 322
 323                 for (idx = 1;
 324                      idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value);
 325                      idx++)
 326                         ;
 327         }
 328
 329         return idx - 1;
 330 }
 331
 332 static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id)
 333 {
 334         const struct bq25890_range *rtbl;
 335
 336         /* lookup table? */
 337         if (id >= TBL_TREG)
 338                 return bq25890_tables[id].lt.tbl[idx];
 339
 340         /* range table */
 341         rtbl = &bq25890_tables[id].rt;
 342
 343         return (rtbl->min + idx * rtbl->step);
 344 }
 345
 346 enum bq25890_status {
 347         STATUS_NOT_CHARGING,
 348         STATUS_PRE_CHARGING,
 349         STATUS_FAST_CHARGING,
 350         STATUS_TERMINATION_DONE,
 351 };
 352
 353 enum bq25890_chrg_fault {
 354         CHRG_FAULT_NORMAL,
 355         CHRG_FAULT_INPUT,
 356         CHRG_FAULT_THERMAL_SHUTDOWN,
 357         CHRG_FAULT_TIMER_EXPIRED,
 358 };
 359
 360 static int bq25890_power_supply_get_property(struct power_supply *psy,
 361                                              enum power_supply_property psp,
 362                                              union power_supply_propval *val)
 363 {
 364         int ret;
 365         struct bq25890_device *bq = power_supply_get_drvdata(psy);
 366         struct bq25890_state state;
 367
 368         mutex_lock(&bq->lock);
 369         state = bq->state;
 370         mutex_unlock(&bq->lock);
 371
 372         switch (psp) {
 373         case POWER_SUPPLY_PROP_STATUS:
 374                 if (!state.online)
 375                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 376                 else if (state.chrg_status == STATUS_NOT_CHARGING)
 377                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 378                 else if (state.chrg_status == STATUS_PRE_CHARGING ||
 379                          state.chrg_status == STATUS_FAST_CHARGING)
 380                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 381                 else if (state.chrg_status == STATUS_TERMINATION_DONE)
 382                         val->intval = POWER_SUPPLY_STATUS_FULL;
 383                 else
 384                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 385
 386                 break;
 387
 388         case POWER_SUPPLY_PROP_MANUFACTURER:
 389                 val->strval = BQ25890_MANUFACTURER;
 390                 break;
 391
 392         case POWER_SUPPLY_PROP_MODEL_NAME:
 393                 if (bq->chip_id == BQ25890_ID)
 394                         val->strval = "BQ25890";
 395                 else if (bq->chip_id == BQ25896_ID)
 396                         val->strval = "BQ25896";
 397                 else
 398                         val->strval = "UNKNOWN";
 399
 400                 break;
 401
 402         case POWER_SUPPLY_PROP_ONLINE:
 403                 val->intval = state.online;
 404                 break;
 405
 406         case POWER_SUPPLY_PROP_HEALTH:
 407                 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault)
 408                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 409                 else if (state.bat_fault)
 410                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 411                 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED)
 412                         val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
 413                 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN)
 414                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 415                 else
 416                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 417                 break;
 418
 419         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 420                 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */
 421                 if (ret < 0)
 422                         return ret;
 423
 424                 /* converted_val = ADC_val * 50mA (table 10.3.19) */
 425                 val->intval = ret * 50000;
 426                 break;
 427
 428         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 429                 val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG);
 430                 break;
 431
 432         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 433                 if (!state.online) {
 434                         val->intval = 0;
 435                         break;
 436                 }
 437
 438                 ret = bq25890_field_read(bq, F_BATV); /* read measured value */
 439                 if (ret < 0)
 440                         return ret;
 441
 442                 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
 443                 val->intval = 2304000 + ret * 20000;
 444                 break;
 445
 446         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 447                 val->intval = bq25890_find_val(bq->init_data.vreg, TBL_VREG);
 448                 break;
 449
 450         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 451                 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
 452                 break;
 453
 454         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 455                 ret = bq25890_field_read(bq, F_SYSV); /* read measured value */
 456                 if (ret < 0)
 457                         return ret;
 458
 459                 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
 460                 val->intval = 2304000 + ret * 20000;
 461                 break;
 462
 463         default:
 464                 return -EINVAL;
 465         }
 466
 467         return 0;
 468 }
 469
 470 static int bq25890_get_chip_state(struct bq25890_device *bq,
 471                                   struct bq25890_state *state)
 472 {
 473         int i, ret;
 474
 475         struct {
 476                 enum bq25890_fields id;
 477                 u8 *data;
 478         } state_fields[] = {
 479                 {F_CHG_STAT,    &state->chrg_status},
 480                 {F_PG_STAT,     &state->online},
 481                 {F_VSYS_STAT,   &state->vsys_status},
 482                 {F_BOOST_FAULT, &state->boost_fault},
 483                 {F_BAT_FAULT,   &state->bat_fault},
 484                 {F_CHG_FAULT,   &state->chrg_fault}
 485         };
 486
 487         for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
 488                 ret = bq25890_field_read(bq, state_fields[i].id);
 489                 if (ret < 0)
 490                         return ret;
 491
 492                 *state_fields[i].data = ret;
 493         }
 494
 495         dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
 496                 state->chrg_status, state->online, state->vsys_status,
 497                 state->chrg_fault, state->boost_fault, state->bat_fault);
 498
 499         return 0;
 500 }
 501
 502 static bool bq25890_state_changed(struct bq25890_device *bq,
 503                                   struct bq25890_state *new_state)
 504 {
 505         struct bq25890_state old_state;
 506
 507         mutex_lock(&bq->lock);
 508         old_state = bq->state;
 509         mutex_unlock(&bq->lock);
 510
 511         return (old_state.chrg_status != new_state->chrg_status ||
 512                 old_state.chrg_fault != new_state->chrg_fault   ||
 513                 old_state.online != new_state->online           ||
 514                 old_state.bat_fault != new_state->bat_fault     ||
 515                 old_state.boost_fault != new_state->boost_fault ||
 516                 old_state.vsys_status != new_state->vsys_status);
 517 }
 518
 519 static void bq25890_handle_state_change(struct bq25890_device *bq,
 520                                         struct bq25890_state *new_state)
 521 {
 522         int ret;
 523         struct bq25890_state old_state;
 524
 525         mutex_lock(&bq->lock);
 526         old_state = bq->state;
 527         mutex_unlock(&bq->lock);
 528
 529         if (!new_state->online) {                            /* power removed */
 530                 /* disable ADC */
 531                 ret = bq25890_field_write(bq, F_CONV_START, 0);
 532                 if (ret < 0)
 533                         goto error;
 534         } else if (!old_state.online) {                     /* power inserted */
 535                 /* enable ADC, to have control of charge current/voltage */
 536                 ret = bq25890_field_write(bq, F_CONV_START, 1);
 537                 if (ret < 0)
 538                         goto error;
 539         }
 540
 541         return;
 542
 543 error:
 544         dev_err(bq->dev, "Error communicating with the chip.\n");
 545 }
 546
 547 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private)
 548 {
 549         struct bq25890_device *bq = private;
 550         int ret;
 551         struct bq25890_state state;
 552
 553         ret = bq25890_get_chip_state(bq, &state);
 554         if (ret < 0)
 555                 goto handled;
 556
 557         if (!bq25890_state_changed(bq, &state))
 558                 goto handled;
 559
 560         bq25890_handle_state_change(bq, &state);
 561
 562         mutex_lock(&bq->lock);
 563         bq->state = state;
 564         mutex_unlock(&bq->lock);
 565
 566         power_supply_changed(bq->charger);
 567
 568 handled:
 569         return IRQ_HANDLED;
 570 }
 571
 572 static int bq25890_chip_reset(struct bq25890_device *bq)
 573 {
 574         int ret;
 575         int rst_check_counter = 10;
 576
 577         ret = bq25890_field_write(bq, F_REG_RST, 1);
 578         if (ret < 0)
 579                 return ret;
 580
 581         do {
 582                 ret = bq25890_field_read(bq, F_REG_RST);
 583                 if (ret < 0)
 584                         return ret;
 585
 586                 usleep_range(5, 10);
 587         } while (ret == 1 && --rst_check_counter);
 588
 589         if (!rst_check_counter)
 590                 return -ETIMEDOUT;
 591
 592         return 0;
 593 }
 594
 595 static int bq25890_hw_init(struct bq25890_device *bq)
 596 {
 597         int ret;
 598         int i;
 599         struct bq25890_state state;
 600
 601         const struct {
 602                 enum bq25890_fields id;
 603                 u32 value;
 604         } init_data[] = {
 605                 {F_ICHG,         bq->init_data.ichg},
 606                 {F_VREG,         bq->init_data.vreg},
 607                 {F_ITERM,        bq->init_data.iterm},
 608                 {F_IPRECHG,      bq->init_data.iprechg},
 609                 {F_SYSVMIN,      bq->init_data.sysvmin},
 610                 {F_BOOSTV,       bq->init_data.boostv},
 611                 {F_BOOSTI,       bq->init_data.boosti},
 612                 {F_BOOSTF,       bq->init_data.boostf},
 613                 {F_EN_ILIM,      bq->init_data.ilim_en},
 614                 {F_TREG,         bq->init_data.treg}
 615         };
 616
 617         ret = bq25890_chip_reset(bq);
 618         if (ret < 0) {
 619                 dev_dbg(bq->dev, "Reset failed %d\n", ret);
 620                 return ret;
 621         }
 622
 623         /* disable watchdog */
 624         ret = bq25890_field_write(bq, F_WD, 0);
 625         if (ret < 0) {
 626                 dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret);
 627                 return ret;
 628         }
 629
 630         /* initialize currents/voltages and other parameters */
 631         for (i = 0; i < ARRAY_SIZE(init_data); i++) {
 632                 ret = bq25890_field_write(bq, init_data[i].id,
 633                                           init_data[i].value);
 634                 if (ret < 0) {
 635                         dev_dbg(bq->dev, "Writing init data failed %d\n", ret);
 636                         return ret;
 637                 }
 638         }
 639
 640         /* Configure ADC for continuous conversions. This does not enable it. */
 641         ret = bq25890_field_write(bq, F_CONV_RATE, 1);
 642         if (ret < 0) {
 643                 dev_dbg(bq->dev, "Config ADC failed %d\n", ret);
 644                 return ret;
 645         }
 646
 647         ret = bq25890_get_chip_state(bq, &state);
 648         if (ret < 0) {
 649                 dev_dbg(bq->dev, "Get state failed %d\n", ret);
 650                 return ret;
 651         }
 652
 653         mutex_lock(&bq->lock);
 654         bq->state = state;
 655         mutex_unlock(&bq->lock);
 656
 657         return 0;
 658 }
 659
 660 static enum power_supply_property bq25890_power_supply_props[] = {
 661         POWER_SUPPLY_PROP_MANUFACTURER,
 662         POWER_SUPPLY_PROP_MODEL_NAME,
 663         POWER_SUPPLY_PROP_STATUS,
 664         POWER_SUPPLY_PROP_ONLINE,
 665         POWER_SUPPLY_PROP_HEALTH,
 666         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 667         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 668         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 669         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 670         POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 671         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 672 };
 673
 674 static char *bq25890_charger_supplied_to[] = {
 675         "main-battery",
 676 };
 677
 678 static const struct power_supply_desc bq25890_power_supply_desc = {
 679         .name = "bq25890-charger",
 680         .type = POWER_SUPPLY_TYPE_USB,
 681         .properties = bq25890_power_supply_props,
 682         .num_properties = ARRAY_SIZE(bq25890_power_supply_props),
 683         .get_property = bq25890_power_supply_get_property,
 684 };
 685
 686 static int bq25890_power_supply_init(struct bq25890_device *bq)
 687 {
 688         struct power_supply_config psy_cfg = { .drv_data = bq, };
 689
 690         psy_cfg.supplied_to = bq25890_charger_supplied_to;
 691         psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to);
 692
 693         bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc,
 694                                             &psy_cfg);
 695
 696         return PTR_ERR_OR_ZERO(bq->charger);
 697 }
 698
 699 static void bq25890_usb_work(struct work_struct *data)
 700 {
 701         int ret;
 702         struct bq25890_device *bq =
 703                         container_of(data, struct bq25890_device, usb_work);
 704
 705         switch (bq->usb_event) {
 706         case USB_EVENT_ID:
 707                 /* Enable boost mode */
 708                 ret = bq25890_field_write(bq, F_OTG_CFG, 1);
 709                 if (ret < 0)
 710                         goto error;
 711                 break;
 712
 713         case USB_EVENT_NONE:
 714                 /* Disable boost mode */
 715                 ret = bq25890_field_write(bq, F_OTG_CFG, 0);
 716                 if (ret < 0)
 717                         goto error;
 718
 719                 power_supply_changed(bq->charger);
 720                 break;
 721         }
 722
 723         return;
 724
 725 error:
 726         dev_err(bq->dev, "Error switching to boost/charger mode.\n");
 727 }
 728
 729 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
 730                                 void *priv)
 731 {
 732         struct bq25890_device *bq =
 733                         container_of(nb, struct bq25890_device, usb_nb);
 734
 735         bq->usb_event = val;
 736         queue_work(system_power_efficient_wq, &bq->usb_work);
 737
 738         return NOTIFY_OK;
 739 }
 740
 741 static int bq25890_irq_probe(struct bq25890_device *bq)
 742 {
 743         struct gpio_desc *irq;
 744
 745         irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN);
 746         if (IS_ERR(irq)) {
 747                 dev_err(bq->dev, "Could not probe irq pin.\n");
 748                 return PTR_ERR(irq);
 749         }
 750
 751         return gpiod_to_irq(irq);
 752 }
 753
 754 static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
 755 {
 756         int ret;
 757         u32 property;
 758         int i;
 759         struct bq25890_init_data *init = &bq->init_data;
 760         struct {
 761                 char *name;
 762                 bool optional;
 763                 enum bq25890_table_ids tbl_id;
 764                 u8 *conv_data; /* holds converted value from given property */
 765         } props[] = {
 766                 /* required properties */
 767                 {"ti,charge-current", false, TBL_ICHG, &init->ichg},
 768                 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg},
 769                 {"ti,termination-current", false, TBL_ITERM, &init->iterm},
 770                 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg},
 771                 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin},
 772                 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv},
 773                 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},
 774
 775                 /* optional properties */
 776                 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg}
 777         };
 778
 779         /* initialize data for optional properties */
 780         init->treg = 3; /* 120 degrees Celsius */
 781
 782         for (i = 0; i < ARRAY_SIZE(props); i++) {
 783                 ret = device_property_read_u32(bq->dev, props[i].name,
 784                                                &property);
 785                 if (ret < 0) {
 786                         if (props[i].optional)
 787                                 continue;
 788
 789                         dev_err(bq->dev, "Unable to read property %d %s\n", ret,
 790                                 props[i].name);
 791
 792                         return ret;
 793                 }
 794
 795                 *props[i].conv_data = bq25890_find_idx(property,
 796                                                        props[i].tbl_id);
 797         }
 798
 799         return 0;
 800 }
 801
 802 static int bq25890_fw_probe(struct bq25890_device *bq)
 803 {
 804         int ret;
 805         struct bq25890_init_data *init = &bq->init_data;
 806
 807         ret = bq25890_fw_read_u32_props(bq);
 808         if (ret < 0)
 809                 return ret;
 810
 811         init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
 812         init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");
 813
 814         return 0;
 815 }
 816
 817 static int bq25890_probe(struct i2c_client *client,
 818                          const struct i2c_device_id *id)
 819 {
 820         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 821         struct device *dev = &client->dev;
 822         struct bq25890_device *bq;
 823         int ret;
 824         int i;
 825
 826         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 827                 dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
 828                 return -ENODEV;
 829         }
 830
 831         bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
 832         if (!bq)
 833                 return -ENOMEM;
 834
 835         bq->client = client;
 836         bq->dev = dev;
 837
 838         mutex_init(&bq->lock);
 839
 840         bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config);
 841         if (IS_ERR(bq->rmap)) {
 842                 dev_err(dev, "failed to allocate register map\n");
 843                 return PTR_ERR(bq->rmap);
 844         }
 845
 846         for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) {
 847                 const struct reg_field *reg_fields = bq25890_reg_fields;
 848
 849                 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap,
 850                                                              reg_fields[i]);
 851                 if (IS_ERR(bq->rmap_fields[i])) {
 852                         dev_err(dev, "cannot allocate regmap field\n");
 853                         return PTR_ERR(bq->rmap_fields[i]);
 854                 }
 855         }
 856
 857         i2c_set_clientdata(client, bq);
 858
 859         bq->chip_id = bq25890_field_read(bq, F_PN);
 860         if (bq->chip_id < 0) {
 861                 dev_err(dev, "Cannot read chip ID.\n");
 862                 return bq->chip_id;
 863         }
 864
 865         if ((bq->chip_id != BQ25890_ID) && (bq->chip_id != BQ25896_ID)) {
 866                 dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id);
 867                 return -ENODEV;
 868         }
 869
 870         if (!dev->platform_data) {
 871                 ret = bq25890_fw_probe(bq);
 872                 if (ret < 0) {
 873                         dev_err(dev, "Cannot read device properties.\n");
 874                         return ret;
 875                 }
 876         } else {
 877                 return -ENODEV;
 878         }
 879
 880         ret = bq25890_hw_init(bq);
 881         if (ret < 0) {
 882                 dev_err(dev, "Cannot initialize the chip.\n");
 883                 return ret;
 884         }
 885
 886         if (client->irq <= 0)
 887                 client->irq = bq25890_irq_probe(bq);
 888
 889         if (client->irq < 0) {
 890                 dev_err(dev, "No irq resource found.\n");
 891                 return client->irq;
 892         }
 893
 894         /* OTG reporting */
 895         bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 896         if (!IS_ERR_OR_NULL(bq->usb_phy)) {
 897                 INIT_WORK(&bq->usb_work, bq25890_usb_work);
 898                 bq->usb_nb.notifier_call = bq25890_usb_notifier;
 899                 usb_register_notifier(bq->usb_phy, &bq->usb_nb);
 900         }
 901
 902         ret = devm_request_threaded_irq(dev, client->irq, NULL,
 903                                         bq25890_irq_handler_thread,
 904                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 905                                         BQ25890_IRQ_PIN, bq);
 906         if (ret)
 907                 goto irq_fail;
 908
 909         ret = bq25890_power_supply_init(bq);
 910         if (ret < 0) {
 911                 dev_err(dev, "Failed to register power supply\n");
 912                 goto irq_fail;
 913         }
 914
 915         return 0;
 916
 917 irq_fail:
 918         if (!IS_ERR_OR_NULL(bq->usb_phy))
 919                 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
 920
 921         return ret;
 922 }
 923
 924 static int bq25890_remove(struct i2c_client *client)
 925 {
 926         struct bq25890_device *bq = i2c_get_clientdata(client);
 927
 928         power_supply_unregister(bq->charger);
 929
 930         if (!IS_ERR_OR_NULL(bq->usb_phy))
 931                 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
 932
 933         /* reset all registers to default values */
 934         bq25890_chip_reset(bq);
 935
 936         return 0;
 937 }
 938
 939 #ifdef CONFIG_PM_SLEEP
 940 static int bq25890_suspend(struct device *dev)
 941 {
 942         struct bq25890_device *bq = dev_get_drvdata(dev);
 943
 944         /*
 945          * If charger is removed, while in suspend, make sure ADC is diabled
 946          * since it consumes slightly more power.
 947          */
 948         return bq25890_field_write(bq, F_CONV_START, 0);
 949 }
 950
 951 static int bq25890_resume(struct device *dev)
 952 {
 953         int ret;
 954         struct bq25890_state state;
 955         struct bq25890_device *bq = dev_get_drvdata(dev);
 956
 957         ret = bq25890_get_chip_state(bq, &state);
 958         if (ret < 0)
 959                 return ret;
 960
 961         mutex_lock(&bq->lock);
 962         bq->state = state;
 963         mutex_unlock(&bq->lock);
 964
 965         /* Re-enable ADC only if charger is plugged in. */
 966         if (state.online) {
 967                 ret = bq25890_field_write(bq, F_CONV_START, 1);
 968                 if (ret < 0)
 969                         return ret;
 970         }
 971
 972         /* signal userspace, maybe state changed while suspended */
 973         power_supply_changed(bq->charger);
 974
 975         return 0;
 976 }
 977 #endif
 978
 979 static const struct dev_pm_ops bq25890_pm = {
 980         SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume)
 981 };
 982
 983 static const struct i2c_device_id bq25890_i2c_ids[] = {
 984         { "bq25890", 0 },
 985         {},
 986 };
 987 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
 988
 989 static const struct of_device_id bq25890_of_match[] = {
 990         { .compatible = "ti,bq25890", },
 991         { },
 992 };
 993 MODULE_DEVICE_TABLE(of, bq25890_of_match);
 994
 995 static const struct acpi_device_id bq25890_acpi_match[] = {
 996         {"BQ258900", 0},
 997         {},
 998 };
 999 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match);
1000
1001 static struct i2c_driver bq25890_driver = {
1002         .driver = {
1003                 .name = "bq25890-charger",
1004                 .of_match_table = of_match_ptr(bq25890_of_match),
1005                 .acpi_match_table = ACPI_PTR(bq25890_acpi_match),
1006                 .pm = &bq25890_pm,
1007         },
1008         .probe = bq25890_probe,
1009         .remove = bq25890_remove,
1010         .id_table = bq25890_i2c_ids,
1011 };
1012 module_i2c_driver(bq25890_driver);
1013
1014 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>");
1015 MODULE_DESCRIPTION("bq25890 charger driver");
1016 MODULE_LICENSE("GPL");