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 = client->adapter; 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"); 1017