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 };
  87
  88 struct bq25890_state {
  89         u8 online;
  90         u8 chrg_status;
  91         u8 chrg_fault;
  92         u8 vsys_status;
  93         u8 boost_fault;
  94         u8 bat_fault;
  95 };
  96
  97 struct bq25890_device {
  98         struct i2c_client *client;
  99         struct device *dev;
 100         struct power_supply *charger;
 101
 102         struct usb_phy *usb_phy;
 103         struct notifier_block usb_nb;
 104         struct work_struct usb_work;
 105         unsigned long usb_event;
 106
 107         struct regmap *rmap;
 108         struct regmap_field *rmap_fields[F_MAX_FIELDS];
 109
 110         enum bq25890_chip_version chip_version;
 111         struct bq25890_init_data init_data;
 112         struct bq25890_state state;
 113
 114         struct mutex lock; /* protect state data */
 115 };
 116
 117 static const struct regmap_range bq25890_readonly_reg_ranges[] = {
 118         regmap_reg_range(0x0b, 0x0c),
 119         regmap_reg_range(0x0e, 0x13),
 120 };
 121
 122 static const struct regmap_access_table bq25890_writeable_regs = {
 123         .no_ranges = bq25890_readonly_reg_ranges,
 124         .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges),
 125 };
 126
 127 static const struct regmap_range bq25890_volatile_reg_ranges[] = {
 128         regmap_reg_range(0x00, 0x00),
 129         regmap_reg_range(0x02, 0x02),
 130         regmap_reg_range(0x09, 0x09),
 131         regmap_reg_range(0x0b, 0x14),
 132 };
 133
 134 static const struct regmap_access_table bq25890_volatile_regs = {
 135         .yes_ranges = bq25890_volatile_reg_ranges,
 136         .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges),
 137 };
 138
 139 static const struct regmap_config bq25890_regmap_config = {
 140         .reg_bits = 8,
 141         .val_bits = 8,
 142
 143         .max_register = 0x14,
 144         .cache_type = REGCACHE_RBTREE,
 145
 146         .wr_table = &bq25890_writeable_regs,
 147         .volatile_table = &bq25890_volatile_regs,
 148 };
 149
 150 static const struct reg_field bq25890_reg_fields[] = {
 151         /* REG00 */
 152         [F_EN_HIZ]              = REG_FIELD(0x00, 7, 7),
 153         [F_EN_ILIM]             = REG_FIELD(0x00, 6, 6),
 154         [F_IILIM]               = REG_FIELD(0x00, 0, 5),
 155         /* REG01 */
 156         [F_BHOT]                = REG_FIELD(0x01, 6, 7),
 157         [F_BCOLD]               = REG_FIELD(0x01, 5, 5),
 158         [F_VINDPM_OFS]          = REG_FIELD(0x01, 0, 4),
 159         /* REG02 */
 160         [F_CONV_START]          = REG_FIELD(0x02, 7, 7),
 161         [F_CONV_RATE]           = REG_FIELD(0x02, 6, 6),
 162         [F_BOOSTF]              = REG_FIELD(0x02, 5, 5),
 163         [F_ICO_EN]              = REG_FIELD(0x02, 4, 4),
 164         [F_HVDCP_EN]            = REG_FIELD(0x02, 3, 3),  // reserved on BQ25896
 165         [F_MAXC_EN]             = REG_FIELD(0x02, 2, 2),  // reserved on BQ25896
 166         [F_FORCE_DPM]           = REG_FIELD(0x02, 1, 1),
 167         [F_AUTO_DPDM_EN]        = REG_FIELD(0x02, 0, 0),
 168         /* REG03 */
 169         [F_BAT_LOAD_EN]         = REG_FIELD(0x03, 7, 7),
 170         [F_WD_RST]              = REG_FIELD(0x03, 6, 6),
 171         [F_OTG_CFG]             = REG_FIELD(0x03, 5, 5),
 172         [F_CHG_CFG]             = REG_FIELD(0x03, 4, 4),
 173         [F_SYSVMIN]             = REG_FIELD(0x03, 1, 3),
 174         [F_MIN_VBAT_SEL]        = REG_FIELD(0x03, 0, 0), // BQ25896 only
 175         /* REG04 */
 176         [F_PUMPX_EN]            = REG_FIELD(0x04, 7, 7),
 177         [F_ICHG]                = REG_FIELD(0x04, 0, 6),
 178         /* REG05 */
 179         [F_IPRECHG]             = REG_FIELD(0x05, 4, 7),
 180         [F_ITERM]               = REG_FIELD(0x05, 0, 3),
 181         /* REG06 */
 182         [F_VREG]                = REG_FIELD(0x06, 2, 7),
 183         [F_BATLOWV]             = REG_FIELD(0x06, 1, 1),
 184         [F_VRECHG]              = REG_FIELD(0x06, 0, 0),
 185         /* REG07 */
 186         [F_TERM_EN]             = REG_FIELD(0x07, 7, 7),
 187         [F_STAT_DIS]            = REG_FIELD(0x07, 6, 6),
 188         [F_WD]                  = REG_FIELD(0x07, 4, 5),
 189         [F_TMR_EN]              = REG_FIELD(0x07, 3, 3),
 190         [F_CHG_TMR]             = REG_FIELD(0x07, 1, 2),
 191         [F_JEITA_ISET]          = REG_FIELD(0x07, 0, 0), // reserved on BQ25895
 192         /* REG08 */
 193         [F_BATCMP]              = REG_FIELD(0x08, 5, 7),
 194         [F_VCLAMP]              = REG_FIELD(0x08, 2, 4),
 195         [F_TREG]                = REG_FIELD(0x08, 0, 1),
 196         /* REG09 */
 197         [F_FORCE_ICO]           = REG_FIELD(0x09, 7, 7),
 198         [F_TMR2X_EN]            = REG_FIELD(0x09, 6, 6),
 199         [F_BATFET_DIS]          = REG_FIELD(0x09, 5, 5),
 200         [F_JEITA_VSET]          = REG_FIELD(0x09, 4, 4), // reserved on BQ25895
 201         [F_BATFET_DLY]          = REG_FIELD(0x09, 3, 3),
 202         [F_BATFET_RST_EN]       = REG_FIELD(0x09, 2, 2),
 203         [F_PUMPX_UP]            = REG_FIELD(0x09, 1, 1),
 204         [F_PUMPX_DN]            = REG_FIELD(0x09, 0, 0),
 205         /* REG0A */
 206         [F_BOOSTV]              = REG_FIELD(0x0A, 4, 7),
 207         [F_BOOSTI]              = REG_FIELD(0x0A, 0, 2), // reserved on BQ25895
 208         [F_PFM_OTG_DIS]         = REG_FIELD(0x0A, 3, 3), // BQ25896 only
 209         /* REG0B */
 210         [F_VBUS_STAT]           = REG_FIELD(0x0B, 5, 7),
 211         [F_CHG_STAT]            = REG_FIELD(0x0B, 3, 4),
 212         [F_PG_STAT]             = REG_FIELD(0x0B, 2, 2),
 213         [F_SDP_STAT]            = REG_FIELD(0x0B, 1, 1), // reserved on BQ25896
 214         [F_VSYS_STAT]           = REG_FIELD(0x0B, 0, 0),
 215         /* REG0C */
 216         [F_WD_FAULT]            = REG_FIELD(0x0C, 7, 7),
 217         [F_BOOST_FAULT]         = REG_FIELD(0x0C, 6, 6),
 218         [F_CHG_FAULT]           = REG_FIELD(0x0C, 4, 5),
 219         [F_BAT_FAULT]           = REG_FIELD(0x0C, 3, 3),
 220         [F_NTC_FAULT]           = REG_FIELD(0x0C, 0, 2),
 221         /* REG0D */
 222         [F_FORCE_VINDPM]        = REG_FIELD(0x0D, 7, 7),
 223         [F_VINDPM]              = REG_FIELD(0x0D, 0, 6),
 224         /* REG0E */
 225         [F_THERM_STAT]          = REG_FIELD(0x0E, 7, 7),
 226         [F_BATV]                = REG_FIELD(0x0E, 0, 6),
 227         /* REG0F */
 228         [F_SYSV]                = REG_FIELD(0x0F, 0, 6),
 229         /* REG10 */
 230         [F_TSPCT]               = REG_FIELD(0x10, 0, 6),
 231         /* REG11 */
 232         [F_VBUS_GD]             = REG_FIELD(0x11, 7, 7),
 233         [F_VBUSV]               = REG_FIELD(0x11, 0, 6),
 234         /* REG12 */
 235         [F_ICHGR]               = REG_FIELD(0x12, 0, 6),
 236         /* REG13 */
 237         [F_VDPM_STAT]           = REG_FIELD(0x13, 7, 7),
 238         [F_IDPM_STAT]           = REG_FIELD(0x13, 6, 6),
 239         [F_IDPM_LIM]            = REG_FIELD(0x13, 0, 5),
 240         /* REG14 */
 241         [F_REG_RST]             = REG_FIELD(0x14, 7, 7),
 242         [F_ICO_OPTIMIZED]       = REG_FIELD(0x14, 6, 6),
 243         [F_PN]                  = REG_FIELD(0x14, 3, 5),
 244         [F_TS_PROFILE]          = REG_FIELD(0x14, 2, 2),
 245         [F_DEV_REV]             = REG_FIELD(0x14, 0, 1)
 246 };
 247
 248 /*
 249  * Most of the val -> idx conversions can be computed, given the minimum,
 250  * maximum and the step between values. For the rest of conversions, we use
 251  * lookup tables.
 252  */
 253 enum bq25890_table_ids {
 254         /* range tables */
 255         TBL_ICHG,
 256         TBL_ITERM,
 257         TBL_IILIM,
 258         TBL_VREG,
 259         TBL_BOOSTV,
 260         TBL_SYSVMIN,
 261
 262         /* lookup tables */
 263         TBL_TREG,
 264         TBL_BOOSTI,
 265 };
 266
 267 /* Thermal Regulation Threshold lookup table, in degrees Celsius */
 268 static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 };
 269
 270 #define BQ25890_TREG_TBL_SIZE           ARRAY_SIZE(bq25890_treg_tbl)
 271
 272 /* Boost mode current limit lookup table, in uA */
 273 static const u32 bq25890_boosti_tbl[] = {
 274         500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000
 275 };
 276
 277 #define BQ25890_BOOSTI_TBL_SIZE         ARRAY_SIZE(bq25890_boosti_tbl)
 278
 279 struct bq25890_range {
 280         u32 min;
 281         u32 max;
 282         u32 step;
 283 };
 284
 285 struct bq25890_lookup {
 286         const u32 *tbl;
 287         u32 size;
 288 };
 289
 290 static const union {
 291         struct bq25890_range  rt;
 292         struct bq25890_lookup lt;
 293 } bq25890_tables[] = {
 294         /* range tables */
 295         /* TODO: BQ25896 has max ICHG 3008 mA */
 296         [TBL_ICHG] =    { .rt = {0,       5056000, 64000} },     /* uA */
 297         [TBL_ITERM] =   { .rt = {64000,   1024000, 64000} },     /* uA */
 298         [TBL_IILIM] =   { .rt = {50000,   3200000, 50000} },     /* uA */
 299         [TBL_VREG] =    { .rt = {3840000, 4608000, 16000} },     /* uV */
 300         [TBL_BOOSTV] =  { .rt = {4550000, 5510000, 64000} },     /* uV */
 301         [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} },    /* uV */
 302
 303         /* lookup tables */
 304         [TBL_TREG] =    { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
 305         [TBL_BOOSTI] =  { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} }
 306 };
 307
 308 static int bq25890_field_read(struct bq25890_device *bq,
 309                               enum bq25890_fields field_id)
 310 {
 311         int ret;
 312         int val;
 313
 314         ret = regmap_field_read(bq->rmap_fields[field_id], &val);
 315         if (ret < 0)
 316                 return ret;
 317
 318         return val;
 319 }
 320
 321 static int bq25890_field_write(struct bq25890_device *bq,
 322                                enum bq25890_fields field_id, u8 val)
 323 {
 324         return regmap_field_write(bq->rmap_fields[field_id], val);
 325 }
 326
 327 static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id)
 328 {
 329         u8 idx;
 330
 331         if (id >= TBL_TREG) {
 332                 const u32 *tbl = bq25890_tables[id].lt.tbl;
 333                 u32 tbl_size = bq25890_tables[id].lt.size;
 334
 335                 for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++)
 336                         ;
 337         } else {
 338                 const struct bq25890_range *rtbl = &bq25890_tables[id].rt;
 339                 u8 rtbl_size;
 340
 341                 rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1;
 342
 343                 for (idx = 1;
 344                      idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value);
 345                      idx++)
 346                         ;
 347         }
 348
 349         return idx - 1;
 350 }
 351
 352 static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id)
 353 {
 354         const struct bq25890_range *rtbl;
 355
 356         /* lookup table? */
 357         if (id >= TBL_TREG)
 358                 return bq25890_tables[id].lt.tbl[idx];
 359
 360         /* range table */
 361         rtbl = &bq25890_tables[id].rt;
 362
 363         return (rtbl->min + idx * rtbl->step);
 364 }
 365
 366 enum bq25890_status {
 367         STATUS_NOT_CHARGING,
 368         STATUS_PRE_CHARGING,
 369         STATUS_FAST_CHARGING,
 370         STATUS_TERMINATION_DONE,
 371 };
 372
 373 enum bq25890_chrg_fault {
 374         CHRG_FAULT_NORMAL,
 375         CHRG_FAULT_INPUT,
 376         CHRG_FAULT_THERMAL_SHUTDOWN,
 377         CHRG_FAULT_TIMER_EXPIRED,
 378 };
 379
 380 static bool bq25890_is_adc_property(enum power_supply_property psp)
 381 {
 382         switch (psp) {
 383         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 384         case POWER_SUPPLY_PROP_CURRENT_NOW:
 385                 return true;
 386
 387         default:
 388                 return false;
 389         }
 390 }
 391
 392 static irqreturn_t __bq25890_handle_irq(struct bq25890_device *bq);
 393
 394 static int bq25890_power_supply_get_property(struct power_supply *psy,
 395                                              enum power_supply_property psp,
 396                                              union power_supply_propval *val)
 397 {
 398         struct bq25890_device *bq = power_supply_get_drvdata(psy);
 399         struct bq25890_state state;
 400         bool do_adc_conv;
 401         int ret;
 402
 403         mutex_lock(&bq->lock);
 404         /* update state in case we lost an interrupt */
 405         __bq25890_handle_irq(bq);
 406         state = bq->state;
 407         do_adc_conv = !state.online && bq25890_is_adc_property(psp);
 408         if (do_adc_conv)
 409                 bq25890_field_write(bq, F_CONV_START, 1);
 410         mutex_unlock(&bq->lock);
 411
 412         if (do_adc_conv)
 413                 regmap_field_read_poll_timeout(bq->rmap_fields[F_CONV_START],
 414                         ret, !ret, 25000, 1000000);
 415
 416         switch (psp) {
 417         case POWER_SUPPLY_PROP_STATUS:
 418                 if (!state.online)
 419                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 420                 else if (state.chrg_status == STATUS_NOT_CHARGING)
 421                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 422                 else if (state.chrg_status == STATUS_PRE_CHARGING ||
 423                          state.chrg_status == STATUS_FAST_CHARGING)
 424                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 425                 else if (state.chrg_status == STATUS_TERMINATION_DONE)
 426                         val->intval = POWER_SUPPLY_STATUS_FULL;
 427                 else
 428                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 429
 430                 break;
 431
 432         case POWER_SUPPLY_PROP_CHARGE_TYPE:
 433                 if (!state.online || state.chrg_status == STATUS_NOT_CHARGING ||
 434                     state.chrg_status == STATUS_TERMINATION_DONE)
 435                         val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
 436                 else if (state.chrg_status == STATUS_PRE_CHARGING)
 437                         val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
 438                 else if (state.chrg_status == STATUS_FAST_CHARGING)
 439                         val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
 440                 else /* unreachable */
 441                         val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
 442                 break;
 443
 444         case POWER_SUPPLY_PROP_MANUFACTURER:
 445                 val->strval = BQ25890_MANUFACTURER;
 446                 break;
 447
 448         case POWER_SUPPLY_PROP_MODEL_NAME:
 449                 val->strval = bq25890_chip_name[bq->chip_version];
 450                 break;
 451
 452         case POWER_SUPPLY_PROP_ONLINE:
 453                 val->intval = state.online;
 454                 break;
 455
 456         case POWER_SUPPLY_PROP_HEALTH:
 457                 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault)
 458                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 459                 else if (state.bat_fault)
 460                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 461                 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED)
 462                         val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
 463                 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN)
 464                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 465                 else
 466                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 467                 break;
 468
 469         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 470                 val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG);
 471                 break;
 472
 473         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 474                 if (!state.online) {
 475                         val->intval = 0;
 476                         break;
 477                 }
 478
 479                 ret = bq25890_field_read(bq, F_BATV); /* read measured value */
 480                 if (ret < 0)
 481                         return ret;
 482
 483                 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
 484                 val->intval = 2304000 + ret * 20000;
 485                 break;
 486
 487         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 488                 val->intval = bq25890_find_val(bq->init_data.vreg, TBL_VREG);
 489                 break;
 490
 491         case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
 492                 val->intval = bq25890_find_val(bq->init_data.iprechg, TBL_ITERM);
 493                 break;
 494
 495         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 496                 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
 497                 break;
 498
 499         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 500                 ret = bq25890_field_read(bq, F_IILIM);
 501                 if (ret < 0)
 502                         return ret;
 503
 504                 val->intval = bq25890_find_val(ret, TBL_IILIM);
 505                 break;
 506
 507         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 508                 ret = bq25890_field_read(bq, F_SYSV); /* read measured value */
 509                 if (ret < 0)
 510                         return ret;
 511
 512                 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
 513                 val->intval = 2304000 + ret * 20000;
 514                 break;
 515
 516         case POWER_SUPPLY_PROP_CURRENT_NOW:
 517                 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */
 518                 if (ret < 0)
 519                         return ret;
 520
 521                 /* converted_val = ADC_val * 50mA (table 10.3.19) */
 522                 val->intval = ret * -50000;
 523                 break;
 524
 525         default:
 526                 return -EINVAL;
 527         }
 528
 529         return 0;
 530 }
 531
 532 static int bq25890_get_chip_state(struct bq25890_device *bq,
 533                                   struct bq25890_state *state)
 534 {
 535         int i, ret;
 536
 537         struct {
 538                 enum bq25890_fields id;
 539                 u8 *data;
 540         } state_fields[] = {
 541                 {F_CHG_STAT,    &state->chrg_status},
 542                 {F_PG_STAT,     &state->online},
 543                 {F_VSYS_STAT,   &state->vsys_status},
 544                 {F_BOOST_FAULT, &state->boost_fault},
 545                 {F_BAT_FAULT,   &state->bat_fault},
 546                 {F_CHG_FAULT,   &state->chrg_fault}
 547         };
 548
 549         for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
 550                 ret = bq25890_field_read(bq, state_fields[i].id);
 551                 if (ret < 0)
 552                         return ret;
 553
 554                 *state_fields[i].data = ret;
 555         }
 556
 557         dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
 558                 state->chrg_status, state->online, state->vsys_status,
 559                 state->chrg_fault, state->boost_fault, state->bat_fault);
 560
 561         return 0;
 562 }
 563
 564 static irqreturn_t __bq25890_handle_irq(struct bq25890_device *bq)
 565 {
 566         struct bq25890_state new_state;
 567         int ret;
 568
 569         ret = bq25890_get_chip_state(bq, &new_state);
 570         if (ret < 0)
 571                 return IRQ_NONE;
 572
 573         if (!memcmp(&bq->state, &new_state, sizeof(new_state)))
 574                 return IRQ_NONE;
 575
 576         if (!new_state.online && bq->state.online) {        /* power removed */
 577                 /* disable ADC */
 578                 ret = bq25890_field_write(bq, F_CONV_START, 0);
 579                 if (ret < 0)
 580                         goto error;
 581         } else if (new_state.online && !bq->state.online) { /* power inserted */
 582                 /* enable ADC, to have control of charge current/voltage */
 583                 ret = bq25890_field_write(bq, F_CONV_START, 1);
 584                 if (ret < 0)
 585                         goto error;
 586         }
 587
 588         bq->state = new_state;
 589         power_supply_changed(bq->charger);
 590
 591         return IRQ_HANDLED;
 592 error:
 593         dev_err(bq->dev, "Error communicating with the chip: %pe\n",
 594                 ERR_PTR(ret));
 595         return IRQ_HANDLED;
 596 }
 597
 598 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private)
 599 {
 600         struct bq25890_device *bq = private;
 601         irqreturn_t ret;
 602
 603         mutex_lock(&bq->lock);
 604         ret = __bq25890_handle_irq(bq);
 605         mutex_unlock(&bq->lock);
 606
 607         return ret;
 608 }
 609
 610 static int bq25890_chip_reset(struct bq25890_device *bq)
 611 {
 612         int ret;
 613         int rst_check_counter = 10;
 614
 615         ret = bq25890_field_write(bq, F_REG_RST, 1);
 616         if (ret < 0)
 617                 return ret;
 618
 619         do {
 620                 ret = bq25890_field_read(bq, F_REG_RST);
 621                 if (ret < 0)
 622                         return ret;
 623
 624                 usleep_range(5, 10);
 625         } while (ret == 1 && --rst_check_counter);
 626
 627         if (!rst_check_counter)
 628                 return -ETIMEDOUT;
 629
 630         return 0;
 631 }
 632
 633 static int bq25890_hw_init(struct bq25890_device *bq)
 634 {
 635         int ret;
 636         int i;
 637
 638         const struct {
 639                 enum bq25890_fields id;
 640                 u32 value;
 641         } init_data[] = {
 642                 {F_ICHG,         bq->init_data.ichg},
 643                 {F_VREG,         bq->init_data.vreg},
 644                 {F_ITERM,        bq->init_data.iterm},
 645                 {F_IPRECHG,      bq->init_data.iprechg},
 646                 {F_SYSVMIN,      bq->init_data.sysvmin},
 647                 {F_BOOSTV,       bq->init_data.boostv},
 648                 {F_BOOSTI,       bq->init_data.boosti},
 649                 {F_BOOSTF,       bq->init_data.boostf},
 650                 {F_EN_ILIM,      bq->init_data.ilim_en},
 651                 {F_TREG,         bq->init_data.treg}
 652         };
 653
 654         ret = bq25890_chip_reset(bq);
 655         if (ret < 0) {
 656                 dev_dbg(bq->dev, "Reset failed %d\n", ret);
 657                 return ret;
 658         }
 659
 660         /* disable watchdog */
 661         ret = bq25890_field_write(bq, F_WD, 0);
 662         if (ret < 0) {
 663                 dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret);
 664                 return ret;
 665         }
 666
 667         /* initialize currents/voltages and other parameters */
 668         for (i = 0; i < ARRAY_SIZE(init_data); i++) {
 669                 ret = bq25890_field_write(bq, init_data[i].id,
 670                                           init_data[i].value);
 671                 if (ret < 0) {
 672                         dev_dbg(bq->dev, "Writing init data failed %d\n", ret);
 673                         return ret;
 674                 }
 675         }
 676
 677         /* Configure ADC for continuous conversions when charging */
 678         ret = bq25890_field_write(bq, F_CONV_RATE, !!bq->state.online);
 679         if (ret < 0) {
 680                 dev_dbg(bq->dev, "Config ADC failed %d\n", ret);
 681                 return ret;
 682         }
 683
 684         ret = bq25890_get_chip_state(bq, &bq->state);
 685         if (ret < 0) {
 686                 dev_dbg(bq->dev, "Get state failed %d\n", ret);
 687                 return ret;
 688         }
 689
 690         return 0;
 691 }
 692
 693 static const enum power_supply_property bq25890_power_supply_props[] = {
 694         POWER_SUPPLY_PROP_MANUFACTURER,
 695         POWER_SUPPLY_PROP_MODEL_NAME,
 696         POWER_SUPPLY_PROP_STATUS,
 697         POWER_SUPPLY_PROP_CHARGE_TYPE,
 698         POWER_SUPPLY_PROP_ONLINE,
 699         POWER_SUPPLY_PROP_HEALTH,
 700         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 701         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 702         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 703         POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
 704         POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 705         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 706         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 707         POWER_SUPPLY_PROP_CURRENT_NOW,
 708 };
 709
 710 static char *bq25890_charger_supplied_to[] = {
 711         "main-battery",
 712 };
 713
 714 static const struct power_supply_desc bq25890_power_supply_desc = {
 715         .name = "bq25890-charger",
 716         .type = POWER_SUPPLY_TYPE_USB,
 717         .properties = bq25890_power_supply_props,
 718         .num_properties = ARRAY_SIZE(bq25890_power_supply_props),
 719         .get_property = bq25890_power_supply_get_property,
 720 };
 721
 722 static int bq25890_power_supply_init(struct bq25890_device *bq)
 723 {
 724         struct power_supply_config psy_cfg = { .drv_data = bq, };
 725
 726         psy_cfg.supplied_to = bq25890_charger_supplied_to;
 727         psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to);
 728
 729         bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc,
 730                                             &psy_cfg);
 731
 732         return PTR_ERR_OR_ZERO(bq->charger);
 733 }
 734
 735 static void bq25890_usb_work(struct work_struct *data)
 736 {
 737         int ret;
 738         struct bq25890_device *bq =
 739                         container_of(data, struct bq25890_device, usb_work);
 740
 741         switch (bq->usb_event) {
 742         case USB_EVENT_ID:
 743                 /* Enable boost mode */
 744                 ret = bq25890_field_write(bq, F_OTG_CFG, 1);
 745                 if (ret < 0)
 746                         goto error;
 747                 break;
 748
 749         case USB_EVENT_NONE:
 750                 /* Disable boost mode */
 751                 ret = bq25890_field_write(bq, F_OTG_CFG, 0);
 752                 if (ret < 0)
 753                         goto error;
 754
 755                 power_supply_changed(bq->charger);
 756                 break;
 757         }
 758
 759         return;
 760
 761 error:
 762         dev_err(bq->dev, "Error switching to boost/charger mode.\n");
 763 }
 764
 765 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
 766                                 void *priv)
 767 {
 768         struct bq25890_device *bq =
 769                         container_of(nb, struct bq25890_device, usb_nb);
 770
 771         bq->usb_event = val;
 772         queue_work(system_power_efficient_wq, &bq->usb_work);
 773
 774         return NOTIFY_OK;
 775 }
 776
 777 static int bq25890_get_chip_version(struct bq25890_device *bq)
 778 {
 779         int id, rev;
 780
 781         id = bq25890_field_read(bq, F_PN);
 782         if (id < 0) {
 783                 dev_err(bq->dev, "Cannot read chip ID.\n");
 784                 return id;
 785         }
 786
 787         rev = bq25890_field_read(bq, F_DEV_REV);
 788         if (rev < 0) {
 789                 dev_err(bq->dev, "Cannot read chip revision.\n");
 790                 return rev;
 791         }
 792
 793         switch (id) {
 794         case BQ25890_ID:
 795                 bq->chip_version = BQ25890;
 796                 break;
 797
 798         /* BQ25892 and BQ25896 share same ID 0 */
 799         case BQ25896_ID:
 800                 switch (rev) {
 801                 case 2:
 802                         bq->chip_version = BQ25896;
 803                         break;
 804                 case 1:
 805                         bq->chip_version = BQ25892;
 806                         break;
 807                 default:
 808                         dev_err(bq->dev,
 809                                 "Unknown device revision %d, assume BQ25892\n",
 810                                 rev);
 811                         bq->chip_version = BQ25892;
 812                 }
 813                 break;
 814
 815         case BQ25895_ID:
 816                 bq->chip_version = BQ25895;
 817                 break;
 818
 819         default:
 820                 dev_err(bq->dev, "Unknown chip ID %d\n", id);
 821                 return -ENODEV;
 822         }
 823
 824         return 0;
 825 }
 826
 827 static int bq25890_irq_probe(struct bq25890_device *bq)
 828 {
 829         struct gpio_desc *irq;
 830
 831         irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN);
 832         if (IS_ERR(irq)) {
 833                 dev_err(bq->dev, "Could not probe irq pin.\n");
 834                 return PTR_ERR(irq);
 835         }
 836
 837         return gpiod_to_irq(irq);
 838 }
 839
 840 static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
 841 {
 842         int ret;
 843         u32 property;
 844         int i;
 845         struct bq25890_init_data *init = &bq->init_data;
 846         struct {
 847                 char *name;
 848                 bool optional;
 849                 enum bq25890_table_ids tbl_id;
 850                 u8 *conv_data; /* holds converted value from given property */
 851         } props[] = {
 852                 /* required properties */
 853                 {"ti,charge-current", false, TBL_ICHG, &init->ichg},
 854                 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg},
 855                 {"ti,termination-current", false, TBL_ITERM, &init->iterm},
 856                 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg},
 857                 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin},
 858                 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv},
 859                 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},
 860
 861                 /* optional properties */
 862                 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg}
 863         };
 864
 865         /* initialize data for optional properties */
 866         init->treg = 3; /* 120 degrees Celsius */
 867
 868         for (i = 0; i < ARRAY_SIZE(props); i++) {
 869                 ret = device_property_read_u32(bq->dev, props[i].name,
 870                                                &property);
 871                 if (ret < 0) {
 872                         if (props[i].optional)
 873                                 continue;
 874
 875                         dev_err(bq->dev, "Unable to read property %d %s\n", ret,
 876                                 props[i].name);
 877
 878                         return ret;
 879                 }
 880
 881                 *props[i].conv_data = bq25890_find_idx(property,
 882                                                        props[i].tbl_id);
 883         }
 884
 885         return 0;
 886 }
 887
 888 static int bq25890_fw_probe(struct bq25890_device *bq)
 889 {
 890         int ret;
 891         struct bq25890_init_data *init = &bq->init_data;
 892
 893         ret = bq25890_fw_read_u32_props(bq);
 894         if (ret < 0)
 895                 return ret;
 896
 897         init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
 898         init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");
 899
 900         return 0;
 901 }
 902
 903 static int bq25890_probe(struct i2c_client *client,
 904                          const struct i2c_device_id *id)
 905 {
 906         struct device *dev = &client->dev;
 907         struct bq25890_device *bq;
 908         int ret;
 909         int i;
 910
 911         bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
 912         if (!bq)
 913                 return -ENOMEM;
 914
 915         bq->client = client;
 916         bq->dev = dev;
 917
 918         mutex_init(&bq->lock);
 919
 920         bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config);
 921         if (IS_ERR(bq->rmap)) {
 922                 dev_err(dev, "failed to allocate register map\n");
 923                 return PTR_ERR(bq->rmap);
 924         }
 925
 926         for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) {
 927                 const struct reg_field *reg_fields = bq25890_reg_fields;
 928
 929                 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap,
 930                                                              reg_fields[i]);
 931                 if (IS_ERR(bq->rmap_fields[i])) {
 932                         dev_err(dev, "cannot allocate regmap field\n");
 933                         return PTR_ERR(bq->rmap_fields[i]);
 934                 }
 935         }
 936
 937         i2c_set_clientdata(client, bq);
 938
 939         ret = bq25890_get_chip_version(bq);
 940         if (ret) {
 941                 dev_err(dev, "Cannot read chip ID or unknown chip.\n");
 942                 return ret;
 943         }
 944
 945         if (!dev->platform_data) {
 946                 ret = bq25890_fw_probe(bq);
 947                 if (ret < 0) {
 948                         dev_err(dev, "Cannot read device properties.\n");
 949                         return ret;
 950                 }
 951         } else {
 952                 return -ENODEV;
 953         }
 954
 955         ret = bq25890_hw_init(bq);
 956         if (ret < 0) {
 957                 dev_err(dev, "Cannot initialize the chip.\n");
 958                 return ret;
 959         }
 960
 961         if (client->irq <= 0)
 962                 client->irq = bq25890_irq_probe(bq);
 963
 964         if (client->irq < 0) {
 965                 dev_err(dev, "No irq resource found.\n");
 966                 return client->irq;
 967         }
 968
 969         /* OTG reporting */
 970         bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 971         if (!IS_ERR_OR_NULL(bq->usb_phy)) {
 972                 INIT_WORK(&bq->usb_work, bq25890_usb_work);
 973                 bq->usb_nb.notifier_call = bq25890_usb_notifier;
 974                 usb_register_notifier(bq->usb_phy, &bq->usb_nb);
 975         }
 976
 977         ret = devm_request_threaded_irq(dev, client->irq, NULL,
 978                                         bq25890_irq_handler_thread,
 979                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 980                                         BQ25890_IRQ_PIN, bq);
 981         if (ret)
 982                 goto irq_fail;
 983
 984         ret = bq25890_power_supply_init(bq);
 985         if (ret < 0) {
 986                 dev_err(dev, "Failed to register power supply\n");
 987                 goto irq_fail;
 988         }
 989
 990         return 0;
 991
 992 irq_fail:
 993         if (!IS_ERR_OR_NULL(bq->usb_phy))
 994                 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
 995
 996         return ret;
 997 }
 998
 999 static int bq25890_remove(struct i2c_client *client)
1000 {
1001         struct bq25890_device *bq = i2c_get_clientdata(client);
1002
1003         power_supply_unregister(bq->charger);
1004
1005         if (!IS_ERR_OR_NULL(bq->usb_phy))
1006                 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
1007
1008         /* reset all registers to default values */
1009         bq25890_chip_reset(bq);
1010
1011         return 0;
1012 }
1013
1014 #ifdef CONFIG_PM_SLEEP
1015 static int bq25890_suspend(struct device *dev)
1016 {
1017         struct bq25890_device *bq = dev_get_drvdata(dev);
1018
1019         /*
1020          * If charger is removed, while in suspend, make sure ADC is diabled
1021          * since it consumes slightly more power.
1022          */
1023         return bq25890_field_write(bq, F_CONV_RATE, 0);
1024 }
1025
1026 static int bq25890_resume(struct device *dev)
1027 {
1028         int ret;
1029         struct bq25890_device *bq = dev_get_drvdata(dev);
1030
1031         mutex_lock(&bq->lock);
1032
1033         ret = bq25890_get_chip_state(bq, &bq->state);
1034         if (ret < 0)
1035                 goto unlock;
1036
1037         /* Re-enable ADC only if charger is plugged in. */
1038         if (bq->state.online) {
1039                 ret = bq25890_field_write(bq, F_CONV_RATE, 1);
1040                 if (ret < 0)
1041                         goto unlock;
1042         }
1043
1044         /* signal userspace, maybe state changed while suspended */
1045         power_supply_changed(bq->charger);
1046
1047 unlock:
1048         mutex_unlock(&bq->lock);
1049
1050         return ret;
1051 }
1052 #endif
1053
1054 static const struct dev_pm_ops bq25890_pm = {
1055         SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume)
1056 };
1057
1058 static const struct i2c_device_id bq25890_i2c_ids[] = {
1059         { "bq25890", 0 },
1060         { "bq25892", 0 },
1061         { "bq25895", 0 },
1062         { "bq25896", 0 },
1063         {},
1064 };
1065 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
1066
1067 static const struct of_device_id bq25890_of_match[] = {
1068         { .compatible = "ti,bq25890", },
1069         { .compatible = "ti,bq25892", },
1070         { .compatible = "ti,bq25895", },
1071         { .compatible = "ti,bq25896", },
1072         { },
1073 };
1074 MODULE_DEVICE_TABLE(of, bq25890_of_match);
1075
1076 static const struct acpi_device_id bq25890_acpi_match[] = {
1077         {"BQ258900", 0},
1078         {},
1079 };
1080 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match);
1081
1082 static struct i2c_driver bq25890_driver = {
1083         .driver = {
1084                 .name = "bq25890-charger",
1085                 .of_match_table = of_match_ptr(bq25890_of_match),
1086                 .acpi_match_table = ACPI_PTR(bq25890_acpi_match),
1087                 .pm = &bq25890_pm,
1088         },
1089         .probe = bq25890_probe,
1090         .remove = bq25890_remove,
1091         .id_table = bq25890_i2c_ids,
1092 };
1093 module_i2c_driver(bq25890_driver);
1094
1095 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>");
1096 MODULE_DESCRIPTION("bq25890 charger driver");
1097 MODULE_LICENSE("GPL");