drivers/power/supply/bq25890_charger.c

   1 /*
   2  * TI BQ25890 charger driver
   3  *
   4  * Copyright (C) 2015 Intel Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/i2c.h>
  20 #include <linux/power_supply.h>
  21 #include <linux/regmap.h>
  22 #include <linux/types.h>
  23 #include <linux/gpio/consumer.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/delay.h>
  26 #include <linux/usb/phy.h>
  27
  28 #include <linux/acpi.h>
  29 #include <linux/of.h>
  30
  31 #define BQ25890_MANUFACTURER            "Texas Instruments"
  32 #define BQ25890_IRQ_PIN                 "bq25890_irq"
  33
  34 #define BQ25890_ID                      3
  35 #define BQ25896_ID                      0
  36
  37 enum bq25890_fields {
  38         F_EN_HIZ, F_EN_ILIM, F_IILIM,                                /* Reg00 */
  39         F_BHOT, F_BCOLD, F_VINDPM_OFS,                               /* Reg01 */
  40         F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN,
  41         F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN,          /* Reg02 */
  42         F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN,    /* Reg03 */
  43         F_PUMPX_EN, F_ICHG,                                          /* Reg04 */
  44         F_IPRECHG, F_ITERM,                                          /* Reg05 */
  45         F_VREG, F_BATLOWV, F_VRECHG,                                 /* Reg06 */
  46         F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR,
  47         F_JEITA_ISET,                                                /* Reg07 */
  48         F_BATCMP, F_VCLAMP, F_TREG,                                  /* Reg08 */
  49         F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET,
  50         F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN,       /* Reg09 */
  51         F_BOOSTV, F_BOOSTI,                                          /* Reg0A */
  52         F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */
  53         F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT,
  54         F_NTC_FAULT,                                                 /* Reg0C */
  55         F_FORCE_VINDPM, F_VINDPM,                                    /* Reg0D */
  56         F_THERM_STAT, F_BATV,                                        /* Reg0E */
  57         F_SYSV,                                                      /* Reg0F */
  58         F_TSPCT,                                                     /* Reg10 */
  59         F_VBUS_GD, F_VBUSV,                                          /* Reg11 */
  60         F_ICHGR,                                                     /* Reg12 */
  61         F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM,                        /* Reg13 */
  62         F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV,   /* Reg14 */
  63
  64         F_MAX_FIELDS
  65 };
  66
  67 /* initial field values, converted to register values */
  68 struct bq25890_init_data {
  69         u8 ichg;        /* charge current               */
  70         u8 vreg;        /* regulation voltage           */
  71         u8 iterm;       /* termination current          */
  72         u8 iprechg;     /* precharge current            */
  73         u8 sysvmin;     /* minimum system voltage limit */
  74         u8 boostv;      /* boost regulation voltage     */
  75         u8 boosti;      /* boost current limit          */
  76         u8 boostf;      /* boost frequency              */
  77         u8 ilim_en;     /* enable ILIM pin              */
  78         u8 treg;        /* thermal regulation threshold */
  79 };
  80
  81 struct bq25890_state {
  82         u8 online;
  83         u8 chrg_status;
  84         u8 chrg_fault;
  85         u8 vsys_status;
  86         u8 boost_fault;
  87         u8 bat_fault;
  88 };
  89
  90 struct bq25890_device {
  91         struct i2c_client *client;
  92         struct device *dev;
  93         struct power_supply *charger;
  94
  95         struct usb_phy *usb_phy;
  96         struct notifier_block usb_nb;
  97         struct work_struct usb_work;
  98         unsigned long usb_event;
  99
 100         struct regmap *rmap;
 101         struct regmap_field *rmap_fields[F_MAX_FIELDS];
 102
 103         int chip_id;
 104         struct bq25890_init_data init_data;
 105         struct bq25890_state state;
 106
 107         struct mutex lock; /* protect state data */
 108 };
 109
 110 static const struct regmap_range bq25890_readonly_reg_ranges[] = {
 111         regmap_reg_range(0x0b, 0x0c),
 112         regmap_reg_range(0x0e, 0x13),
 113 };
 114
 115 static const struct regmap_access_table bq25890_writeable_regs = {
 116         .no_ranges = bq25890_readonly_reg_ranges,
 117         .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges),
 118 };
 119
 120 static const struct regmap_range bq25890_volatile_reg_ranges[] = {
 121         regmap_reg_range(0x00, 0x00),
 122         regmap_reg_range(0x09, 0x09),
 123         regmap_reg_range(0x0b, 0x0c),
 124         regmap_reg_range(0x0e, 0x14),
 125 };
 126
 127 static const struct regmap_access_table bq25890_volatile_regs = {
 128         .yes_ranges = bq25890_volatile_reg_ranges,
 129         .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges),
 130 };
 131
 132 static const struct regmap_config bq25890_regmap_config = {
 133         .reg_bits = 8,
 134         .val_bits = 8,
 135
 136         .max_register = 0x14,
 137         .cache_type = REGCACHE_RBTREE,
 138
 139         .wr_table = &bq25890_writeable_regs,
 140         .volatile_table = &bq25890_volatile_regs,
 141 };
 142
 143 static const struct reg_field bq25890_reg_fields[] = {
 144         /* REG00 */
 145         [F_EN_HIZ]              = REG_FIELD(0x00, 7, 7),
 146         [F_EN_ILIM]             = REG_FIELD(0x00, 6, 6),
 147         [F_IILIM]               = REG_FIELD(0x00, 0, 5),
 148         /* REG01 */
 149         [F_BHOT]                = REG_FIELD(0x01, 6, 7),
 150         [F_BCOLD]               = REG_FIELD(0x01, 5, 5),
 151         [F_VINDPM_OFS]          = REG_FIELD(0x01, 0, 4),
 152         /* REG02 */
 153         [F_CONV_START]          = REG_FIELD(0x02, 7, 7),
 154         [F_CONV_RATE]           = REG_FIELD(0x02, 6, 6),
 155         [F_BOOSTF]              = REG_FIELD(0x02, 5, 5),
 156         [F_ICO_EN]              = REG_FIELD(0x02, 4, 4),
 157         [F_HVDCP_EN]            = REG_FIELD(0x02, 3, 3),  // reserved on BQ25896
 158         [F_MAXC_EN]             = REG_FIELD(0x02, 2, 2),  // reserved on BQ25896
 159         [F_FORCE_DPM]           = REG_FIELD(0x02, 1, 1),
 160         [F_AUTO_DPDM_EN]        = REG_FIELD(0x02, 0, 0),
 161         /* REG03 */
 162         [F_BAT_LOAD_EN]         = REG_FIELD(0x03, 7, 7),
 163         [F_WD_RST]              = REG_FIELD(0x03, 6, 6),
 164         [F_OTG_CFG]             = REG_FIELD(0x03, 5, 5),
 165         [F_CHG_CFG]             = REG_FIELD(0x03, 4, 4),
 166         [F_SYSVMIN]             = REG_FIELD(0x03, 1, 3),
 167         /* MIN_VBAT_SEL on BQ25896 */
 168         /* REG04 */
 169         [F_PUMPX_EN]            = REG_FIELD(0x04, 7, 7),
 170         [F_ICHG]                = REG_FIELD(0x04, 0, 6),
 171         /* REG05 */
 172         [F_IPRECHG]             = REG_FIELD(0x05, 4, 7),
 173         [F_ITERM]               = REG_FIELD(0x05, 0, 3),
 174         /* REG06 */
 175         [F_VREG]                = REG_FIELD(0x06, 2, 7),
 176         [F_BATLOWV]             = REG_FIELD(0x06, 1, 1),
 177         [F_VRECHG]              = REG_FIELD(0x06, 0, 0),
 178         /* REG07 */
 179         [F_TERM_EN]             = REG_FIELD(0x07, 7, 7),
 180         [F_STAT_DIS]            = REG_FIELD(0x07, 6, 6),
 181         [F_WD]                  = REG_FIELD(0x07, 4, 5),
 182         [F_TMR_EN]              = REG_FIELD(0x07, 3, 3),
 183         [F_CHG_TMR]             = REG_FIELD(0x07, 1, 2),
 184         [F_JEITA_ISET]          = REG_FIELD(0x07, 0, 0),
 185         /* REG08 */
 186         [F_BATCMP]              = REG_FIELD(0x08, 6, 7), // 5-7 on BQ25896
 187         [F_VCLAMP]              = REG_FIELD(0x08, 2, 4),
 188         [F_TREG]                = REG_FIELD(0x08, 0, 1),
 189         /* REG09 */
 190         [F_FORCE_ICO]           = REG_FIELD(0x09, 7, 7),
 191         [F_TMR2X_EN]            = REG_FIELD(0x09, 6, 6),
 192         [F_BATFET_DIS]          = REG_FIELD(0x09, 5, 5),
 193         [F_JEITA_VSET]          = REG_FIELD(0x09, 4, 4),
 194         [F_BATFET_DLY]          = REG_FIELD(0x09, 3, 3),
 195         [F_BATFET_RST_EN]       = REG_FIELD(0x09, 2, 2),
 196         [F_PUMPX_UP]            = REG_FIELD(0x09, 1, 1),
 197         [F_PUMPX_DN]            = REG_FIELD(0x09, 0, 0),
 198         /* REG0A */
 199         [F_BOOSTV]              = REG_FIELD(0x0A, 4, 7),
 200         /* PFM_OTG_DIS 3 on BQ25896 */
 201         [F_BOOSTI]              = REG_FIELD(0x0A, 0, 2),
 202         /* REG0B */
 203         [F_VBUS_STAT]           = REG_FIELD(0x0B, 5, 7),
 204         [F_CHG_STAT]            = REG_FIELD(0x0B, 3, 4),
 205         [F_PG_STAT]             = REG_FIELD(0x0B, 2, 2),
 206         [F_SDP_STAT]            = REG_FIELD(0x0B, 1, 1), // reserved on BQ25896
 207         [F_VSYS_STAT]           = REG_FIELD(0x0B, 0, 0),
 208         /* REG0C */
 209         [F_WD_FAULT]            = REG_FIELD(0x0C, 7, 7),
 210         [F_BOOST_FAULT]         = REG_FIELD(0x0C, 6, 6),
 211         [F_CHG_FAULT]           = REG_FIELD(0x0C, 4, 5),
 212         [F_BAT_FAULT]           = REG_FIELD(0x0C, 3, 3),
 213         [F_NTC_FAULT]           = REG_FIELD(0x0C, 0, 2),
 214         /* REG0D */
 215         [F_FORCE_VINDPM]        = REG_FIELD(0x0D, 7, 7),
 216         [F_VINDPM]              = REG_FIELD(0x0D, 0, 6),
 217         /* REG0E */
 218         [F_THERM_STAT]          = REG_FIELD(0x0E, 7, 7),
 219         [F_BATV]                = REG_FIELD(0x0E, 0, 6),
 220         /* REG0F */
 221         [F_SYSV]                = REG_FIELD(0x0F, 0, 6),
 222         /* REG10 */
 223         [F_TSPCT]               = REG_FIELD(0x10, 0, 6),
 224         /* REG11 */
 225         [F_VBUS_GD]             = REG_FIELD(0x11, 7, 7),
 226         [F_VBUSV]               = REG_FIELD(0x11, 0, 6),
 227         /* REG12 */
 228         [F_ICHGR]               = REG_FIELD(0x12, 0, 6),
 229         /* REG13 */
 230         [F_VDPM_STAT]           = REG_FIELD(0x13, 7, 7),
 231         [F_IDPM_STAT]           = REG_FIELD(0x13, 6, 6),
 232         [F_IDPM_LIM]            = REG_FIELD(0x13, 0, 5),
 233         /* REG14 */
 234         [F_REG_RST]             = REG_FIELD(0x14, 7, 7),
 235         [F_ICO_OPTIMIZED]       = REG_FIELD(0x14, 6, 6),
 236         [F_PN]                  = REG_FIELD(0x14, 3, 5),
 237         [F_TS_PROFILE]          = REG_FIELD(0x14, 2, 2),
 238         [F_DEV_REV]             = REG_FIELD(0x14, 0, 1)
 239 };
 240
 241 /*
 242  * Most of the val -> idx conversions can be computed, given the minimum,
 243  * maximum and the step between values. For the rest of conversions, we use
 244  * lookup tables.
 245  */
 246 enum bq25890_table_ids {
 247         /* range tables */
 248         TBL_ICHG,
 249         TBL_ITERM,
 250         TBL_VREG,
 251         TBL_BOOSTV,
 252         TBL_SYSVMIN,
 253
 254         /* lookup tables */
 255         TBL_TREG,
 256         TBL_BOOSTI,
 257 };
 258
 259 /* Thermal Regulation Threshold lookup table, in degrees Celsius */
 260 static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 };
 261
 262 #define BQ25890_TREG_TBL_SIZE           ARRAY_SIZE(bq25890_treg_tbl)
 263
 264 /* Boost mode current limit lookup table, in uA */
 265 static const u32 bq25890_boosti_tbl[] = {
 266         500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000
 267 };
 268
 269 #define BQ25890_BOOSTI_TBL_SIZE         ARRAY_SIZE(bq25890_boosti_tbl)
 270
 271 struct bq25890_range {
 272         u32 min;
 273         u32 max;
 274         u32 step;
 275 };
 276
 277 struct bq25890_lookup {
 278         const u32 *tbl;
 279         u32 size;
 280 };
 281
 282 static const union {
 283         struct bq25890_range  rt;
 284         struct bq25890_lookup lt;
 285 } bq25890_tables[] = {
 286         /* range tables */
 287         [TBL_ICHG] =    { .rt = {0,       5056000, 64000} },     /* uA */
 288         [TBL_ITERM] =   { .rt = {64000,   1024000, 64000} },     /* uA */
 289         [TBL_VREG] =    { .rt = {3840000, 4608000, 16000} },     /* uV */
 290         [TBL_BOOSTV] =  { .rt = {4550000, 5510000, 64000} },     /* uV */
 291         [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} },    /* uV */
 292
 293         /* lookup tables */
 294         [TBL_TREG] =    { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
 295         [TBL_BOOSTI] =  { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} }
 296 };
 297
 298 static int bq25890_field_read(struct bq25890_device *bq,
 299                               enum bq25890_fields field_id)
 300 {
 301         int ret;
 302         int val;
 303
 304         ret = regmap_field_read(bq->rmap_fields[field_id], &val);
 305         if (ret < 0)
 306                 return ret;
 307
 308         return val;
 309 }
 310
 311 static int bq25890_field_write(struct bq25890_device *bq,
 312                                enum bq25890_fields field_id, u8 val)
 313 {
 314         return regmap_field_write(bq->rmap_fields[field_id], val);
 315 }
 316
 317 static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id)
 318 {
 319         u8 idx;
 320
 321         if (id >= TBL_TREG) {
 322                 const u32 *tbl = bq25890_tables[id].lt.tbl;
 323                 u32 tbl_size = bq25890_tables[id].lt.size;
 324
 325                 for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++)
 326                         ;
 327         } else {
 328                 const struct bq25890_range *rtbl = &bq25890_tables[id].rt;
 329                 u8 rtbl_size;
 330
 331                 rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1;
 332
 333                 for (idx = 1;
 334                      idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value);
 335                      idx++)
 336                         ;
 337         }
 338
 339         return idx - 1;
 340 }
 341
 342 static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id)
 343 {
 344         const struct bq25890_range *rtbl;
 345
 346         /* lookup table? */
 347         if (id >= TBL_TREG)
 348                 return bq25890_tables[id].lt.tbl[idx];
 349
 350         /* range table */
 351         rtbl = &bq25890_tables[id].rt;
 352
 353         return (rtbl->min + idx * rtbl->step);
 354 }
 355
 356 enum bq25890_status {
 357         STATUS_NOT_CHARGING,
 358         STATUS_PRE_CHARGING,
 359         STATUS_FAST_CHARGING,
 360         STATUS_TERMINATION_DONE,
 361 };
 362
 363 enum bq25890_chrg_fault {
 364         CHRG_FAULT_NORMAL,
 365         CHRG_FAULT_INPUT,
 366         CHRG_FAULT_THERMAL_SHUTDOWN,
 367         CHRG_FAULT_TIMER_EXPIRED,
 368 };
 369
 370 static int bq25890_power_supply_get_property(struct power_supply *psy,
 371                                              enum power_supply_property psp,
 372                                              union power_supply_propval *val)
 373 {
 374         int ret;
 375         struct bq25890_device *bq = power_supply_get_drvdata(psy);
 376         struct bq25890_state state;
 377
 378         mutex_lock(&bq->lock);
 379         state = bq->state;
 380         mutex_unlock(&bq->lock);
 381
 382         switch (psp) {
 383         case POWER_SUPPLY_PROP_STATUS:
 384                 if (!state.online)
 385                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 386                 else if (state.chrg_status == STATUS_NOT_CHARGING)
 387                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 388                 else if (state.chrg_status == STATUS_PRE_CHARGING ||
 389                          state.chrg_status == STATUS_FAST_CHARGING)
 390                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 391                 else if (state.chrg_status == STATUS_TERMINATION_DONE)
 392                         val->intval = POWER_SUPPLY_STATUS_FULL;
 393                 else
 394                         val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
 395
 396                 break;
 397
 398         case POWER_SUPPLY_PROP_MANUFACTURER:
 399                 val->strval = BQ25890_MANUFACTURER;
 400                 break;
 401
 402         case POWER_SUPPLY_PROP_MODEL_NAME:
 403                 if (bq->chip_id == BQ25890_ID)
 404                         val->strval = "BQ25890";
 405                 else if (bq->chip_id == BQ25896_ID)
 406                         val->strval = "BQ25896";
 407                 else
 408                         val->strval = "UNKNOWN";
 409
 410                 break;
 411
 412         case POWER_SUPPLY_PROP_ONLINE:
 413                 val->intval = state.online;
 414                 break;
 415
 416         case POWER_SUPPLY_PROP_HEALTH:
 417                 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault)
 418                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
 419                 else if (state.bat_fault)
 420                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 421                 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED)
 422                         val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
 423                 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN)
 424                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
 425                 else
 426                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 427                 break;
 428
 429         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 430                 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */
 431                 if (ret < 0)
 432                         return ret;
 433
 434                 /* converted_val = ADC_val * 50mA (table 10.3.19) */
 435                 val->intval = ret * 50000;
 436                 break;
 437
 438         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 439                 val->intval = bq25890_tables[TBL_ICHG].rt.max;
 440                 break;
 441
 442         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 443                 if (!state.online) {
 444                         val->intval = 0;
 445                         break;
 446                 }
 447
 448                 ret = bq25890_field_read(bq, F_BATV); /* read measured value */
 449                 if (ret < 0)
 450                         return ret;
 451
 452                 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
 453                 val->intval = 2304000 + ret * 20000;
 454                 break;
 455
 456         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
 457                 val->intval = bq25890_tables[TBL_VREG].rt.max;
 458                 break;
 459
 460         case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
 461                 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
 462                 break;
 463
 464         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 465                 ret = bq25890_field_read(bq, F_SYSV); /* read measured value */
 466                 if (ret < 0)
 467                         return ret;
 468
 469                 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
 470                 val->intval = 2304000 + ret * 20000;
 471                 break;
 472
 473         default:
 474                 return -EINVAL;
 475         }
 476
 477         return 0;
 478 }
 479
 480 static int bq25890_get_chip_state(struct bq25890_device *bq,
 481                                   struct bq25890_state *state)
 482 {
 483         int i, ret;
 484
 485         struct {
 486                 enum bq25890_fields id;
 487                 u8 *data;
 488         } state_fields[] = {
 489                 {F_CHG_STAT,    &state->chrg_status},
 490                 {F_PG_STAT,     &state->online},
 491                 {F_VSYS_STAT,   &state->vsys_status},
 492                 {F_BOOST_FAULT, &state->boost_fault},
 493                 {F_BAT_FAULT,   &state->bat_fault},
 494                 {F_CHG_FAULT,   &state->chrg_fault}
 495         };
 496
 497         for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
 498                 ret = bq25890_field_read(bq, state_fields[i].id);
 499                 if (ret < 0)
 500                         return ret;
 501
 502                 *state_fields[i].data = ret;
 503         }
 504
 505         dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n",
 506                 state->chrg_status, state->online, state->vsys_status,
 507                 state->chrg_fault, state->boost_fault, state->bat_fault);
 508
 509         return 0;
 510 }
 511
 512 static bool bq25890_state_changed(struct bq25890_device *bq,
 513                                   struct bq25890_state *new_state)
 514 {
 515         struct bq25890_state old_state;
 516
 517         mutex_lock(&bq->lock);
 518         old_state = bq->state;
 519         mutex_unlock(&bq->lock);
 520
 521         return (old_state.chrg_status != new_state->chrg_status ||
 522                 old_state.chrg_fault != new_state->chrg_fault   ||
 523                 old_state.online != new_state->online           ||
 524                 old_state.bat_fault != new_state->bat_fault     ||
 525                 old_state.boost_fault != new_state->boost_fault ||
 526                 old_state.vsys_status != new_state->vsys_status);
 527 }
 528
 529 static void bq25890_handle_state_change(struct bq25890_device *bq,
 530                                         struct bq25890_state *new_state)
 531 {
 532         int ret;
 533         struct bq25890_state old_state;
 534
 535         mutex_lock(&bq->lock);
 536         old_state = bq->state;
 537         mutex_unlock(&bq->lock);
 538
 539         if (!new_state->online) {                            /* power removed */
 540                 /* disable ADC */
 541                 ret = bq25890_field_write(bq, F_CONV_START, 0);
 542                 if (ret < 0)
 543                         goto error;
 544         } else if (!old_state.online) {                     /* power inserted */
 545                 /* enable ADC, to have control of charge current/voltage */
 546                 ret = bq25890_field_write(bq, F_CONV_START, 1);
 547                 if (ret < 0)
 548                         goto error;
 549         }
 550
 551         return;
 552
 553 error:
 554         dev_err(bq->dev, "Error communicating with the chip.\n");
 555 }
 556
 557 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private)
 558 {
 559         struct bq25890_device *bq = private;
 560         int ret;
 561         struct bq25890_state state;
 562
 563         ret = bq25890_get_chip_state(bq, &state);
 564         if (ret < 0)
 565                 goto handled;
 566
 567         if (!bq25890_state_changed(bq, &state))
 568                 goto handled;
 569
 570         bq25890_handle_state_change(bq, &state);
 571
 572         mutex_lock(&bq->lock);
 573         bq->state = state;
 574         mutex_unlock(&bq->lock);
 575
 576         power_supply_changed(bq->charger);
 577
 578 handled:
 579         return IRQ_HANDLED;
 580 }
 581
 582 static int bq25890_chip_reset(struct bq25890_device *bq)
 583 {
 584         int ret;
 585         int rst_check_counter = 10;
 586
 587         ret = bq25890_field_write(bq, F_REG_RST, 1);
 588         if (ret < 0)
 589                 return ret;
 590
 591         do {
 592                 ret = bq25890_field_read(bq, F_REG_RST);
 593                 if (ret < 0)
 594                         return ret;
 595
 596                 usleep_range(5, 10);
 597         } while (ret == 1 && --rst_check_counter);
 598
 599         if (!rst_check_counter)
 600                 return -ETIMEDOUT;
 601
 602         return 0;
 603 }
 604
 605 static int bq25890_hw_init(struct bq25890_device *bq)
 606 {
 607         int ret;
 608         int i;
 609         struct bq25890_state state;
 610
 611         const struct {
 612                 enum bq25890_fields id;
 613                 u32 value;
 614         } init_data[] = {
 615                 {F_ICHG,         bq->init_data.ichg},
 616                 {F_VREG,         bq->init_data.vreg},
 617                 {F_ITERM,        bq->init_data.iterm},
 618                 {F_IPRECHG,      bq->init_data.iprechg},
 619                 {F_SYSVMIN,      bq->init_data.sysvmin},
 620                 {F_BOOSTV,       bq->init_data.boostv},
 621                 {F_BOOSTI,       bq->init_data.boosti},
 622                 {F_BOOSTF,       bq->init_data.boostf},
 623                 {F_EN_ILIM,      bq->init_data.ilim_en},
 624                 {F_TREG,         bq->init_data.treg}
 625         };
 626
 627         ret = bq25890_chip_reset(bq);
 628         if (ret < 0) {
 629                 dev_dbg(bq->dev, "Reset failed %d\n", ret);
 630                 return ret;
 631         }
 632
 633         /* disable watchdog */
 634         ret = bq25890_field_write(bq, F_WD, 0);
 635         if (ret < 0) {
 636                 dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret);
 637                 return ret;
 638         }
 639
 640         /* initialize currents/voltages and other parameters */
 641         for (i = 0; i < ARRAY_SIZE(init_data); i++) {
 642                 ret = bq25890_field_write(bq, init_data[i].id,
 643                                           init_data[i].value);
 644                 if (ret < 0) {
 645                         dev_dbg(bq->dev, "Writing init data failed %d\n", ret);
 646                         return ret;
 647                 }
 648         }
 649
 650         /* Configure ADC for continuous conversions. This does not enable it. */
 651         ret = bq25890_field_write(bq, F_CONV_RATE, 1);
 652         if (ret < 0) {
 653                 dev_dbg(bq->dev, "Config ADC failed %d\n", ret);
 654                 return ret;
 655         }
 656
 657         ret = bq25890_get_chip_state(bq, &state);
 658         if (ret < 0) {
 659                 dev_dbg(bq->dev, "Get state failed %d\n", ret);
 660                 return ret;
 661         }
 662
 663         mutex_lock(&bq->lock);
 664         bq->state = state;
 665         mutex_unlock(&bq->lock);
 666
 667         return 0;
 668 }
 669
 670 static enum power_supply_property bq25890_power_supply_props[] = {
 671         POWER_SUPPLY_PROP_MANUFACTURER,
 672         POWER_SUPPLY_PROP_MODEL_NAME,
 673         POWER_SUPPLY_PROP_STATUS,
 674         POWER_SUPPLY_PROP_ONLINE,
 675         POWER_SUPPLY_PROP_HEALTH,
 676         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 677         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 678         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 679         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
 680         POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
 681         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 682 };
 683
 684 static char *bq25890_charger_supplied_to[] = {
 685         "main-battery",
 686 };
 687
 688 static const struct power_supply_desc bq25890_power_supply_desc = {
 689         .name = "bq25890-charger",
 690         .type = POWER_SUPPLY_TYPE_USB,
 691         .properties = bq25890_power_supply_props,
 692         .num_properties = ARRAY_SIZE(bq25890_power_supply_props),
 693         .get_property = bq25890_power_supply_get_property,
 694 };
 695
 696 static int bq25890_power_supply_init(struct bq25890_device *bq)
 697 {
 698         struct power_supply_config psy_cfg = { .drv_data = bq, };
 699
 700         psy_cfg.supplied_to = bq25890_charger_supplied_to;
 701         psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to);
 702
 703         bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc,
 704                                             &psy_cfg);
 705
 706         return PTR_ERR_OR_ZERO(bq->charger);
 707 }
 708
 709 static void bq25890_usb_work(struct work_struct *data)
 710 {
 711         int ret;
 712         struct bq25890_device *bq =
 713                         container_of(data, struct bq25890_device, usb_work);
 714
 715         switch (bq->usb_event) {
 716         case USB_EVENT_ID:
 717                 /* Enable boost mode */
 718                 ret = bq25890_field_write(bq, F_OTG_CFG, 1);
 719                 if (ret < 0)
 720                         goto error;
 721                 break;
 722
 723         case USB_EVENT_NONE:
 724                 /* Disable boost mode */
 725                 ret = bq25890_field_write(bq, F_OTG_CFG, 0);
 726                 if (ret < 0)
 727                         goto error;
 728
 729                 power_supply_changed(bq->charger);
 730                 break;
 731         }
 732
 733         return;
 734
 735 error:
 736         dev_err(bq->dev, "Error switching to boost/charger mode.\n");
 737 }
 738
 739 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
 740                                 void *priv)
 741 {
 742         struct bq25890_device *bq =
 743                         container_of(nb, struct bq25890_device, usb_nb);
 744
 745         bq->usb_event = val;
 746         queue_work(system_power_efficient_wq, &bq->usb_work);
 747
 748         return NOTIFY_OK;
 749 }
 750
 751 static int bq25890_irq_probe(struct bq25890_device *bq)
 752 {
 753         struct gpio_desc *irq;
 754
 755         irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN);
 756         if (IS_ERR(irq)) {
 757                 dev_err(bq->dev, "Could not probe irq pin.\n");
 758                 return PTR_ERR(irq);
 759         }
 760
 761         return gpiod_to_irq(irq);
 762 }
 763
 764 static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
 765 {
 766         int ret;
 767         u32 property;
 768         int i;
 769         struct bq25890_init_data *init = &bq->init_data;
 770         struct {
 771                 char *name;
 772                 bool optional;
 773                 enum bq25890_table_ids tbl_id;
 774                 u8 *conv_data; /* holds converted value from given property */
 775         } props[] = {
 776                 /* required properties */
 777                 {"ti,charge-current", false, TBL_ICHG, &init->ichg},
 778                 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg},
 779                 {"ti,termination-current", false, TBL_ITERM, &init->iterm},
 780                 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg},
 781                 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin},
 782                 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv},
 783                 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},
 784
 785                 /* optional properties */
 786                 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg}
 787         };
 788
 789         /* initialize data for optional properties */
 790         init->treg = 3; /* 120 degrees Celsius */
 791
 792         for (i = 0; i < ARRAY_SIZE(props); i++) {
 793                 ret = device_property_read_u32(bq->dev, props[i].name,
 794                                                &property);
 795                 if (ret < 0) {
 796                         if (props[i].optional)
 797                                 continue;
 798
 799                         dev_err(bq->dev, "Unable to read property %d %s\n", ret,
 800                                 props[i].name);
 801
 802                         return ret;
 803                 }
 804
 805                 *props[i].conv_data = bq25890_find_idx(property,
 806                                                        props[i].tbl_id);
 807         }
 808
 809         return 0;
 810 }
 811
 812 static int bq25890_fw_probe(struct bq25890_device *bq)
 813 {
 814         int ret;
 815         struct bq25890_init_data *init = &bq->init_data;
 816
 817         ret = bq25890_fw_read_u32_props(bq);
 818         if (ret < 0)
 819                 return ret;
 820
 821         init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
 822         init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");
 823
 824         return 0;
 825 }
 826
 827 static int bq25890_probe(struct i2c_client *client,
 828                          const struct i2c_device_id *id)
 829 {
 830         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 831         struct device *dev = &client->dev;
 832         struct bq25890_device *bq;
 833         int ret;
 834         int i;
 835
 836         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 837                 dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
 838                 return -ENODEV;
 839         }
 840
 841         bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
 842         if (!bq)
 843                 return -ENOMEM;
 844
 845         bq->client = client;
 846         bq->dev = dev;
 847
 848         mutex_init(&bq->lock);
 849
 850         bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config);
 851         if (IS_ERR(bq->rmap)) {
 852                 dev_err(dev, "failed to allocate register map\n");
 853                 return PTR_ERR(bq->rmap);
 854         }
 855
 856         for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) {
 857                 const struct reg_field *reg_fields = bq25890_reg_fields;
 858
 859                 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap,
 860                                                              reg_fields[i]);
 861                 if (IS_ERR(bq->rmap_fields[i])) {
 862                         dev_err(dev, "cannot allocate regmap field\n");
 863                         return PTR_ERR(bq->rmap_fields[i]);
 864                 }
 865         }
 866
 867         i2c_set_clientdata(client, bq);
 868
 869         bq->chip_id = bq25890_field_read(bq, F_PN);
 870         if (bq->chip_id < 0) {
 871                 dev_err(dev, "Cannot read chip ID.\n");
 872                 return bq->chip_id;
 873         }
 874
 875         if ((bq->chip_id != BQ25890_ID) && (bq->chip_id != BQ25896_ID)) {
 876                 dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id);
 877                 return -ENODEV;
 878         }
 879
 880         if (!dev->platform_data) {
 881                 ret = bq25890_fw_probe(bq);
 882                 if (ret < 0) {
 883                         dev_err(dev, "Cannot read device properties.\n");
 884                         return ret;
 885                 }
 886         } else {
 887                 return -ENODEV;
 888         }
 889
 890         ret = bq25890_hw_init(bq);
 891         if (ret < 0) {
 892                 dev_err(dev, "Cannot initialize the chip.\n");
 893                 return ret;
 894         }
 895
 896         if (client->irq <= 0)
 897                 client->irq = bq25890_irq_probe(bq);
 898
 899         if (client->irq < 0) {
 900                 dev_err(dev, "No irq resource found.\n");
 901                 return client->irq;
 902         }
 903
 904         /* OTG reporting */
 905         bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 906         if (!IS_ERR_OR_NULL(bq->usb_phy)) {
 907                 INIT_WORK(&bq->usb_work, bq25890_usb_work);
 908                 bq->usb_nb.notifier_call = bq25890_usb_notifier;
 909                 usb_register_notifier(bq->usb_phy, &bq->usb_nb);
 910         }
 911
 912         ret = devm_request_threaded_irq(dev, client->irq, NULL,
 913                                         bq25890_irq_handler_thread,
 914                                         IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 915                                         BQ25890_IRQ_PIN, bq);
 916         if (ret)
 917                 goto irq_fail;
 918
 919         ret = bq25890_power_supply_init(bq);
 920         if (ret < 0) {
 921                 dev_err(dev, "Failed to register power supply\n");
 922                 goto irq_fail;
 923         }
 924
 925         return 0;
 926
 927 irq_fail:
 928         if (!IS_ERR_OR_NULL(bq->usb_phy))
 929                 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
 930
 931         return ret;
 932 }
 933
 934 static int bq25890_remove(struct i2c_client *client)
 935 {
 936         struct bq25890_device *bq = i2c_get_clientdata(client);
 937
 938         power_supply_unregister(bq->charger);
 939
 940         if (!IS_ERR_OR_NULL(bq->usb_phy))
 941                 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);
 942
 943         /* reset all registers to default values */
 944         bq25890_chip_reset(bq);
 945
 946         return 0;
 947 }
 948
 949 #ifdef CONFIG_PM_SLEEP
 950 static int bq25890_suspend(struct device *dev)
 951 {
 952         struct bq25890_device *bq = dev_get_drvdata(dev);
 953
 954         /*
 955          * If charger is removed, while in suspend, make sure ADC is diabled
 956          * since it consumes slightly more power.
 957          */
 958         return bq25890_field_write(bq, F_CONV_START, 0);
 959 }
 960
 961 static int bq25890_resume(struct device *dev)
 962 {
 963         int ret;
 964         struct bq25890_state state;
 965         struct bq25890_device *bq = dev_get_drvdata(dev);
 966
 967         ret = bq25890_get_chip_state(bq, &state);
 968         if (ret < 0)
 969                 return ret;
 970
 971         mutex_lock(&bq->lock);
 972         bq->state = state;
 973         mutex_unlock(&bq->lock);
 974
 975         /* Re-enable ADC only if charger is plugged in. */
 976         if (state.online) {
 977                 ret = bq25890_field_write(bq, F_CONV_START, 1);
 978                 if (ret < 0)
 979                         return ret;
 980         }
 981
 982         /* signal userspace, maybe state changed while suspended */
 983         power_supply_changed(bq->charger);
 984
 985         return 0;
 986 }
 987 #endif
 988
 989 static const struct dev_pm_ops bq25890_pm = {
 990         SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume)
 991 };
 992
 993 static const struct i2c_device_id bq25890_i2c_ids[] = {
 994         { "bq25890", 0 },
 995         {},
 996 };
 997 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);
 998
 999 static const struct of_device_id bq25890_of_match[] = {
1000         { .compatible = "ti,bq25890", },
1001         { },
1002 };
1003 MODULE_DEVICE_TABLE(of, bq25890_of_match);
1004
1005 static const struct acpi_device_id bq25890_acpi_match[] = {
1006         {"BQ258900", 0},
1007         {},
1008 };
1009 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match);
1010
1011 static struct i2c_driver bq25890_driver = {
1012         .driver = {
1013                 .name = "bq25890-charger",
1014                 .of_match_table = of_match_ptr(bq25890_of_match),
1015                 .acpi_match_table = ACPI_PTR(bq25890_acpi_match),
1016                 .pm = &bq25890_pm,
1017         },
1018         .probe = bq25890_probe,
1019         .remove = bq25890_remove,
1020         .id_table = bq25890_i2c_ids,
1021 };
1022 module_i2c_driver(bq25890_driver);
1023
1024 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>");
1025 MODULE_DESCRIPTION("bq25890 charger driver");
1026 MODULE_LICENSE("GPL");