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_fields { 29 F_EN_HIZ, F_EN_ILIM, F_IILIM, /* Reg00 */ 30 F_BHOT, F_BCOLD, F_VINDPM_OFS, /* Reg01 */ 31 F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN, 32 F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN, /* Reg02 */ 33 F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN, /* Reg03 */ 34 F_PUMPX_EN, F_ICHG, /* Reg04 */ 35 F_IPRECHG, F_ITERM, /* Reg05 */ 36 F_VREG, F_BATLOWV, F_VRECHG, /* Reg06 */ 37 F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR, 38 F_JEITA_ISET, /* Reg07 */ 39 F_BATCMP, F_VCLAMP, F_TREG, /* Reg08 */ 40 F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET, 41 F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN, /* Reg09 */ 42 F_BOOSTV, F_BOOSTI, /* Reg0A */ 43 F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */ 44 F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT, 45 F_NTC_FAULT, /* Reg0C */ 46 F_FORCE_VINDPM, F_VINDPM, /* Reg0D */ 47 F_THERM_STAT, F_BATV, /* Reg0E */ 48 F_SYSV, /* Reg0F */ 49 F_TSPCT, /* Reg10 */ 50 F_VBUS_GD, F_VBUSV, /* Reg11 */ 51 F_ICHGR, /* Reg12 */ 52 F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM, /* Reg13 */ 53 F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV, /* Reg14 */ 54 55 F_MAX_FIELDS 56 }; 57 58 /* initial field values, converted to register values */ 59 struct bq25890_init_data { 60 u8 ichg; /* charge current */ 61 u8 vreg; /* regulation voltage */ 62 u8 iterm; /* termination current */ 63 u8 iprechg; /* precharge current */ 64 u8 sysvmin; /* minimum system voltage limit */ 65 u8 boostv; /* boost regulation voltage */ 66 u8 boosti; /* boost current limit */ 67 u8 boostf; /* boost frequency */ 68 u8 ilim_en; /* enable ILIM pin */ 69 u8 treg; /* thermal regulation threshold */ 70 }; 71 72 struct bq25890_state { 73 u8 online; 74 u8 chrg_status; 75 u8 chrg_fault; 76 u8 vsys_status; 77 u8 boost_fault; 78 u8 bat_fault; 79 }; 80 81 struct bq25890_device { 82 struct i2c_client *client; 83 struct device *dev; 84 struct power_supply *charger; 85 86 struct usb_phy *usb_phy; 87 struct notifier_block usb_nb; 88 struct work_struct usb_work; 89 unsigned long usb_event; 90 91 struct regmap *rmap; 92 struct regmap_field *rmap_fields[F_MAX_FIELDS]; 93 94 int chip_id; 95 struct bq25890_init_data init_data; 96 struct bq25890_state state; 97 98 struct mutex lock; /* protect state data */ 99 }; 100 101 static const struct regmap_range bq25890_readonly_reg_ranges[] = { 102 regmap_reg_range(0x0b, 0x0c), 103 regmap_reg_range(0x0e, 0x13), 104 }; 105 106 static const struct regmap_access_table bq25890_writeable_regs = { 107 .no_ranges = bq25890_readonly_reg_ranges, 108 .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges), 109 }; 110 111 static const struct regmap_range bq25890_volatile_reg_ranges[] = { 112 regmap_reg_range(0x00, 0x00), 113 regmap_reg_range(0x09, 0x09), 114 regmap_reg_range(0x0b, 0x0c), 115 regmap_reg_range(0x0e, 0x14), 116 }; 117 118 static const struct regmap_access_table bq25890_volatile_regs = { 119 .yes_ranges = bq25890_volatile_reg_ranges, 120 .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges), 121 }; 122 123 static const struct regmap_config bq25890_regmap_config = { 124 .reg_bits = 8, 125 .val_bits = 8, 126 127 .max_register = 0x14, 128 .cache_type = REGCACHE_RBTREE, 129 130 .wr_table = &bq25890_writeable_regs, 131 .volatile_table = &bq25890_volatile_regs, 132 }; 133 134 static const struct reg_field bq25890_reg_fields[] = { 135 /* REG00 */ 136 [F_EN_HIZ] = REG_FIELD(0x00, 7, 7), 137 [F_EN_ILIM] = REG_FIELD(0x00, 6, 6), 138 [F_IILIM] = REG_FIELD(0x00, 0, 5), 139 /* REG01 */ 140 [F_BHOT] = REG_FIELD(0x01, 6, 7), 141 [F_BCOLD] = REG_FIELD(0x01, 5, 5), 142 [F_VINDPM_OFS] = REG_FIELD(0x01, 0, 4), 143 /* REG02 */ 144 [F_CONV_START] = REG_FIELD(0x02, 7, 7), 145 [F_CONV_RATE] = REG_FIELD(0x02, 6, 6), 146 [F_BOOSTF] = REG_FIELD(0x02, 5, 5), 147 [F_ICO_EN] = REG_FIELD(0x02, 4, 4), 148 [F_HVDCP_EN] = REG_FIELD(0x02, 3, 3), // reserved on BQ25896 149 [F_MAXC_EN] = REG_FIELD(0x02, 2, 2), // reserved on BQ25896 150 [F_FORCE_DPM] = REG_FIELD(0x02, 1, 1), 151 [F_AUTO_DPDM_EN] = REG_FIELD(0x02, 0, 0), 152 /* REG03 */ 153 [F_BAT_LOAD_EN] = REG_FIELD(0x03, 7, 7), 154 [F_WD_RST] = REG_FIELD(0x03, 6, 6), 155 [F_OTG_CFG] = REG_FIELD(0x03, 5, 5), 156 [F_CHG_CFG] = REG_FIELD(0x03, 4, 4), 157 [F_SYSVMIN] = REG_FIELD(0x03, 1, 3), 158 /* MIN_VBAT_SEL on BQ25896 */ 159 /* REG04 */ 160 [F_PUMPX_EN] = REG_FIELD(0x04, 7, 7), 161 [F_ICHG] = REG_FIELD(0x04, 0, 6), 162 /* REG05 */ 163 [F_IPRECHG] = REG_FIELD(0x05, 4, 7), 164 [F_ITERM] = REG_FIELD(0x05, 0, 3), 165 /* REG06 */ 166 [F_VREG] = REG_FIELD(0x06, 2, 7), 167 [F_BATLOWV] = REG_FIELD(0x06, 1, 1), 168 [F_VRECHG] = REG_FIELD(0x06, 0, 0), 169 /* REG07 */ 170 [F_TERM_EN] = REG_FIELD(0x07, 7, 7), 171 [F_STAT_DIS] = REG_FIELD(0x07, 6, 6), 172 [F_WD] = REG_FIELD(0x07, 4, 5), 173 [F_TMR_EN] = REG_FIELD(0x07, 3, 3), 174 [F_CHG_TMR] = REG_FIELD(0x07, 1, 2), 175 [F_JEITA_ISET] = REG_FIELD(0x07, 0, 0), // reserved on BQ25895 176 /* REG08 */ 177 [F_BATCMP] = REG_FIELD(0x08, 5, 7), 178 [F_VCLAMP] = REG_FIELD(0x08, 2, 4), 179 [F_TREG] = REG_FIELD(0x08, 0, 1), 180 /* REG09 */ 181 [F_FORCE_ICO] = REG_FIELD(0x09, 7, 7), 182 [F_TMR2X_EN] = REG_FIELD(0x09, 6, 6), 183 [F_BATFET_DIS] = REG_FIELD(0x09, 5, 5), 184 [F_JEITA_VSET] = REG_FIELD(0x09, 4, 4), // reserved on BQ25895 185 [F_BATFET_DLY] = REG_FIELD(0x09, 3, 3), 186 [F_BATFET_RST_EN] = REG_FIELD(0x09, 2, 2), 187 [F_PUMPX_UP] = REG_FIELD(0x09, 1, 1), 188 [F_PUMPX_DN] = REG_FIELD(0x09, 0, 0), 189 /* REG0A */ 190 [F_BOOSTV] = REG_FIELD(0x0A, 4, 7), 191 /* PFM_OTG_DIS 3 on BQ25896 */ 192 [F_BOOSTI] = REG_FIELD(0x0A, 0, 2), // reserved on BQ25895 193 /* REG0B */ 194 [F_VBUS_STAT] = REG_FIELD(0x0B, 5, 7), 195 [F_CHG_STAT] = REG_FIELD(0x0B, 3, 4), 196 [F_PG_STAT] = REG_FIELD(0x0B, 2, 2), 197 [F_SDP_STAT] = REG_FIELD(0x0B, 1, 1), // reserved on BQ25896 198 [F_VSYS_STAT] = REG_FIELD(0x0B, 0, 0), 199 /* REG0C */ 200 [F_WD_FAULT] = REG_FIELD(0x0C, 7, 7), 201 [F_BOOST_FAULT] = REG_FIELD(0x0C, 6, 6), 202 [F_CHG_FAULT] = REG_FIELD(0x0C, 4, 5), 203 [F_BAT_FAULT] = REG_FIELD(0x0C, 3, 3), 204 [F_NTC_FAULT] = REG_FIELD(0x0C, 0, 2), 205 /* REG0D */ 206 [F_FORCE_VINDPM] = REG_FIELD(0x0D, 7, 7), 207 [F_VINDPM] = REG_FIELD(0x0D, 0, 6), 208 /* REG0E */ 209 [F_THERM_STAT] = REG_FIELD(0x0E, 7, 7), 210 [F_BATV] = REG_FIELD(0x0E, 0, 6), 211 /* REG0F */ 212 [F_SYSV] = REG_FIELD(0x0F, 0, 6), 213 /* REG10 */ 214 [F_TSPCT] = REG_FIELD(0x10, 0, 6), 215 /* REG11 */ 216 [F_VBUS_GD] = REG_FIELD(0x11, 7, 7), 217 [F_VBUSV] = REG_FIELD(0x11, 0, 6), 218 /* REG12 */ 219 [F_ICHGR] = REG_FIELD(0x12, 0, 6), 220 /* REG13 */ 221 [F_VDPM_STAT] = REG_FIELD(0x13, 7, 7), 222 [F_IDPM_STAT] = REG_FIELD(0x13, 6, 6), 223 [F_IDPM_LIM] = REG_FIELD(0x13, 0, 5), 224 /* REG14 */ 225 [F_REG_RST] = REG_FIELD(0x14, 7, 7), 226 [F_ICO_OPTIMIZED] = REG_FIELD(0x14, 6, 6), 227 [F_PN] = REG_FIELD(0x14, 3, 5), 228 [F_TS_PROFILE] = REG_FIELD(0x14, 2, 2), 229 [F_DEV_REV] = REG_FIELD(0x14, 0, 1) 230 }; 231 232 /* 233 * Most of the val -> idx conversions can be computed, given the minimum, 234 * maximum and the step between values. For the rest of conversions, we use 235 * lookup tables. 236 */ 237 enum bq25890_table_ids { 238 /* range tables */ 239 TBL_ICHG, 240 TBL_ITERM, 241 TBL_VREG, 242 TBL_BOOSTV, 243 TBL_SYSVMIN, 244 245 /* lookup tables */ 246 TBL_TREG, 247 TBL_BOOSTI, 248 }; 249 250 /* Thermal Regulation Threshold lookup table, in degrees Celsius */ 251 static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 }; 252 253 #define BQ25890_TREG_TBL_SIZE ARRAY_SIZE(bq25890_treg_tbl) 254 255 /* Boost mode current limit lookup table, in uA */ 256 static const u32 bq25890_boosti_tbl[] = { 257 500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000 258 }; 259 260 #define BQ25890_BOOSTI_TBL_SIZE ARRAY_SIZE(bq25890_boosti_tbl) 261 262 struct bq25890_range { 263 u32 min; 264 u32 max; 265 u32 step; 266 }; 267 268 struct bq25890_lookup { 269 const u32 *tbl; 270 u32 size; 271 }; 272 273 static const union { 274 struct bq25890_range rt; 275 struct bq25890_lookup lt; 276 } bq25890_tables[] = { 277 /* range tables */ 278 [TBL_ICHG] = { .rt = {0, 5056000, 64000} }, /* uA */ 279 [TBL_ITERM] = { .rt = {64000, 1024000, 64000} }, /* uA */ 280 [TBL_VREG] = { .rt = {3840000, 4608000, 16000} }, /* uV */ 281 [TBL_BOOSTV] = { .rt = {4550000, 5510000, 64000} }, /* uV */ 282 [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} }, /* uV */ 283 284 /* lookup tables */ 285 [TBL_TREG] = { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} }, 286 [TBL_BOOSTI] = { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} } 287 }; 288 289 static int bq25890_field_read(struct bq25890_device *bq, 290 enum bq25890_fields field_id) 291 { 292 int ret; 293 int val; 294 295 ret = regmap_field_read(bq->rmap_fields[field_id], &val); 296 if (ret < 0) 297 return ret; 298 299 return val; 300 } 301 302 static int bq25890_field_write(struct bq25890_device *bq, 303 enum bq25890_fields field_id, u8 val) 304 { 305 return regmap_field_write(bq->rmap_fields[field_id], val); 306 } 307 308 static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id) 309 { 310 u8 idx; 311 312 if (id >= TBL_TREG) { 313 const u32 *tbl = bq25890_tables[id].lt.tbl; 314 u32 tbl_size = bq25890_tables[id].lt.size; 315 316 for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++) 317 ; 318 } else { 319 const struct bq25890_range *rtbl = &bq25890_tables[id].rt; 320 u8 rtbl_size; 321 322 rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1; 323 324 for (idx = 1; 325 idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value); 326 idx++) 327 ; 328 } 329 330 return idx - 1; 331 } 332 333 static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id) 334 { 335 const struct bq25890_range *rtbl; 336 337 /* lookup table? */ 338 if (id >= TBL_TREG) 339 return bq25890_tables[id].lt.tbl[idx]; 340 341 /* range table */ 342 rtbl = &bq25890_tables[id].rt; 343 344 return (rtbl->min + idx * rtbl->step); 345 } 346 347 enum bq25890_status { 348 STATUS_NOT_CHARGING, 349 STATUS_PRE_CHARGING, 350 STATUS_FAST_CHARGING, 351 STATUS_TERMINATION_DONE, 352 }; 353 354 enum bq25890_chrg_fault { 355 CHRG_FAULT_NORMAL, 356 CHRG_FAULT_INPUT, 357 CHRG_FAULT_THERMAL_SHUTDOWN, 358 CHRG_FAULT_TIMER_EXPIRED, 359 }; 360 361 static int bq25890_power_supply_get_property(struct power_supply *psy, 362 enum power_supply_property psp, 363 union power_supply_propval *val) 364 { 365 int ret; 366 struct bq25890_device *bq = power_supply_get_drvdata(psy); 367 struct bq25890_state state; 368 369 mutex_lock(&bq->lock); 370 state = bq->state; 371 mutex_unlock(&bq->lock); 372 373 switch (psp) { 374 case POWER_SUPPLY_PROP_STATUS: 375 if (!state.online) 376 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 377 else if (state.chrg_status == STATUS_NOT_CHARGING) 378 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 379 else if (state.chrg_status == STATUS_PRE_CHARGING || 380 state.chrg_status == STATUS_FAST_CHARGING) 381 val->intval = POWER_SUPPLY_STATUS_CHARGING; 382 else if (state.chrg_status == STATUS_TERMINATION_DONE) 383 val->intval = POWER_SUPPLY_STATUS_FULL; 384 else 385 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 386 387 break; 388 389 case POWER_SUPPLY_PROP_MANUFACTURER: 390 val->strval = BQ25890_MANUFACTURER; 391 break; 392 393 case POWER_SUPPLY_PROP_MODEL_NAME: 394 if (bq->chip_id == BQ25890_ID) 395 val->strval = "BQ25890"; 396 else if (bq->chip_id == BQ25895_ID) 397 val->strval = "BQ25895"; 398 else if (bq->chip_id == BQ25896_ID) 399 val->strval = "BQ25896"; 400 else 401 val->strval = "UNKNOWN"; 402 403 break; 404 405 case POWER_SUPPLY_PROP_ONLINE: 406 val->intval = state.online; 407 break; 408 409 case POWER_SUPPLY_PROP_HEALTH: 410 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault) 411 val->intval = POWER_SUPPLY_HEALTH_GOOD; 412 else if (state.bat_fault) 413 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 414 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED) 415 val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; 416 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN) 417 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 418 else 419 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 420 break; 421 422 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 423 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */ 424 if (ret < 0) 425 return ret; 426 427 /* converted_val = ADC_val * 50mA (table 10.3.19) */ 428 val->intval = ret * 50000; 429 break; 430 431 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 432 val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG); 433 break; 434 435 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 436 if (!state.online) { 437 val->intval = 0; 438 break; 439 } 440 441 ret = bq25890_field_read(bq, F_BATV); /* read measured value */ 442 if (ret < 0) 443 return ret; 444 445 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ 446 val->intval = 2304000 + ret * 20000; 447 break; 448 449 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: 450 val->intval = bq25890_find_val(bq->init_data.vreg, TBL_VREG); 451 break; 452 453 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: 454 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM); 455 break; 456 457 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 458 ret = bq25890_field_read(bq, F_SYSV); /* read measured value */ 459 if (ret < 0) 460 return ret; 461 462 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ 463 val->intval = 2304000 + ret * 20000; 464 break; 465 466 default: 467 return -EINVAL; 468 } 469 470 return 0; 471 } 472 473 static int bq25890_get_chip_state(struct bq25890_device *bq, 474 struct bq25890_state *state) 475 { 476 int i, ret; 477 478 struct { 479 enum bq25890_fields id; 480 u8 *data; 481 } state_fields[] = { 482 {F_CHG_STAT, &state->chrg_status}, 483 {F_PG_STAT, &state->online}, 484 {F_VSYS_STAT, &state->vsys_status}, 485 {F_BOOST_FAULT, &state->boost_fault}, 486 {F_BAT_FAULT, &state->bat_fault}, 487 {F_CHG_FAULT, &state->chrg_fault} 488 }; 489 490 for (i = 0; i < ARRAY_SIZE(state_fields); i++) { 491 ret = bq25890_field_read(bq, state_fields[i].id); 492 if (ret < 0) 493 return ret; 494 495 *state_fields[i].data = ret; 496 } 497 498 dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n", 499 state->chrg_status, state->online, state->vsys_status, 500 state->chrg_fault, state->boost_fault, state->bat_fault); 501 502 return 0; 503 } 504 505 static bool bq25890_state_changed(struct bq25890_device *bq, 506 struct bq25890_state *new_state) 507 { 508 struct bq25890_state old_state; 509 510 mutex_lock(&bq->lock); 511 old_state = bq->state; 512 mutex_unlock(&bq->lock); 513 514 return (old_state.chrg_status != new_state->chrg_status || 515 old_state.chrg_fault != new_state->chrg_fault || 516 old_state.online != new_state->online || 517 old_state.bat_fault != new_state->bat_fault || 518 old_state.boost_fault != new_state->boost_fault || 519 old_state.vsys_status != new_state->vsys_status); 520 } 521 522 static void bq25890_handle_state_change(struct bq25890_device *bq, 523 struct bq25890_state *new_state) 524 { 525 int ret; 526 struct bq25890_state old_state; 527 528 mutex_lock(&bq->lock); 529 old_state = bq->state; 530 mutex_unlock(&bq->lock); 531 532 if (!new_state->online) { /* power removed */ 533 /* disable ADC */ 534 ret = bq25890_field_write(bq, F_CONV_START, 0); 535 if (ret < 0) 536 goto error; 537 } else if (!old_state.online) { /* power inserted */ 538 /* enable ADC, to have control of charge current/voltage */ 539 ret = bq25890_field_write(bq, F_CONV_START, 1); 540 if (ret < 0) 541 goto error; 542 } 543 544 return; 545 546 error: 547 dev_err(bq->dev, "Error communicating with the chip.\n"); 548 } 549 550 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private) 551 { 552 struct bq25890_device *bq = private; 553 int ret; 554 struct bq25890_state state; 555 556 ret = bq25890_get_chip_state(bq, &state); 557 if (ret < 0) 558 goto handled; 559 560 if (!bq25890_state_changed(bq, &state)) 561 goto handled; 562 563 bq25890_handle_state_change(bq, &state); 564 565 mutex_lock(&bq->lock); 566 bq->state = state; 567 mutex_unlock(&bq->lock); 568 569 power_supply_changed(bq->charger); 570 571 handled: 572 return IRQ_HANDLED; 573 } 574 575 static int bq25890_chip_reset(struct bq25890_device *bq) 576 { 577 int ret; 578 int rst_check_counter = 10; 579 580 ret = bq25890_field_write(bq, F_REG_RST, 1); 581 if (ret < 0) 582 return ret; 583 584 do { 585 ret = bq25890_field_read(bq, F_REG_RST); 586 if (ret < 0) 587 return ret; 588 589 usleep_range(5, 10); 590 } while (ret == 1 && --rst_check_counter); 591 592 if (!rst_check_counter) 593 return -ETIMEDOUT; 594 595 return 0; 596 } 597 598 static int bq25890_hw_init(struct bq25890_device *bq) 599 { 600 int ret; 601 int i; 602 struct bq25890_state state; 603 604 const struct { 605 enum bq25890_fields id; 606 u32 value; 607 } init_data[] = { 608 {F_ICHG, bq->init_data.ichg}, 609 {F_VREG, bq->init_data.vreg}, 610 {F_ITERM, bq->init_data.iterm}, 611 {F_IPRECHG, bq->init_data.iprechg}, 612 {F_SYSVMIN, bq->init_data.sysvmin}, 613 {F_BOOSTV, bq->init_data.boostv}, 614 {F_BOOSTI, bq->init_data.boosti}, 615 {F_BOOSTF, bq->init_data.boostf}, 616 {F_EN_ILIM, bq->init_data.ilim_en}, 617 {F_TREG, bq->init_data.treg} 618 }; 619 620 ret = bq25890_chip_reset(bq); 621 if (ret < 0) { 622 dev_dbg(bq->dev, "Reset failed %d\n", ret); 623 return ret; 624 } 625 626 /* disable watchdog */ 627 ret = bq25890_field_write(bq, F_WD, 0); 628 if (ret < 0) { 629 dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret); 630 return ret; 631 } 632 633 /* initialize currents/voltages and other parameters */ 634 for (i = 0; i < ARRAY_SIZE(init_data); i++) { 635 ret = bq25890_field_write(bq, init_data[i].id, 636 init_data[i].value); 637 if (ret < 0) { 638 dev_dbg(bq->dev, "Writing init data failed %d\n", ret); 639 return ret; 640 } 641 } 642 643 /* Configure ADC for continuous conversions. This does not enable it. */ 644 ret = bq25890_field_write(bq, F_CONV_RATE, 1); 645 if (ret < 0) { 646 dev_dbg(bq->dev, "Config ADC failed %d\n", ret); 647 return ret; 648 } 649 650 ret = bq25890_get_chip_state(bq, &state); 651 if (ret < 0) { 652 dev_dbg(bq->dev, "Get state failed %d\n", ret); 653 return ret; 654 } 655 656 mutex_lock(&bq->lock); 657 bq->state = state; 658 mutex_unlock(&bq->lock); 659 660 return 0; 661 } 662 663 static enum power_supply_property bq25890_power_supply_props[] = { 664 POWER_SUPPLY_PROP_MANUFACTURER, 665 POWER_SUPPLY_PROP_MODEL_NAME, 666 POWER_SUPPLY_PROP_STATUS, 667 POWER_SUPPLY_PROP_ONLINE, 668 POWER_SUPPLY_PROP_HEALTH, 669 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, 670 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 671 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, 672 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 673 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, 674 POWER_SUPPLY_PROP_VOLTAGE_NOW, 675 }; 676 677 static char *bq25890_charger_supplied_to[] = { 678 "main-battery", 679 }; 680 681 static const struct power_supply_desc bq25890_power_supply_desc = { 682 .name = "bq25890-charger", 683 .type = POWER_SUPPLY_TYPE_USB, 684 .properties = bq25890_power_supply_props, 685 .num_properties = ARRAY_SIZE(bq25890_power_supply_props), 686 .get_property = bq25890_power_supply_get_property, 687 }; 688 689 static int bq25890_power_supply_init(struct bq25890_device *bq) 690 { 691 struct power_supply_config psy_cfg = { .drv_data = bq, }; 692 693 psy_cfg.supplied_to = bq25890_charger_supplied_to; 694 psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to); 695 696 bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc, 697 &psy_cfg); 698 699 return PTR_ERR_OR_ZERO(bq->charger); 700 } 701 702 static void bq25890_usb_work(struct work_struct *data) 703 { 704 int ret; 705 struct bq25890_device *bq = 706 container_of(data, struct bq25890_device, usb_work); 707 708 switch (bq->usb_event) { 709 case USB_EVENT_ID: 710 /* Enable boost mode */ 711 ret = bq25890_field_write(bq, F_OTG_CFG, 1); 712 if (ret < 0) 713 goto error; 714 break; 715 716 case USB_EVENT_NONE: 717 /* Disable boost mode */ 718 ret = bq25890_field_write(bq, F_OTG_CFG, 0); 719 if (ret < 0) 720 goto error; 721 722 power_supply_changed(bq->charger); 723 break; 724 } 725 726 return; 727 728 error: 729 dev_err(bq->dev, "Error switching to boost/charger mode.\n"); 730 } 731 732 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val, 733 void *priv) 734 { 735 struct bq25890_device *bq = 736 container_of(nb, struct bq25890_device, usb_nb); 737 738 bq->usb_event = val; 739 queue_work(system_power_efficient_wq, &bq->usb_work); 740 741 return NOTIFY_OK; 742 } 743 744 static int bq25890_irq_probe(struct bq25890_device *bq) 745 { 746 struct gpio_desc *irq; 747 748 irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN); 749 if (IS_ERR(irq)) { 750 dev_err(bq->dev, "Could not probe irq pin.\n"); 751 return PTR_ERR(irq); 752 } 753 754 return gpiod_to_irq(irq); 755 } 756 757 static int bq25890_fw_read_u32_props(struct bq25890_device *bq) 758 { 759 int ret; 760 u32 property; 761 int i; 762 struct bq25890_init_data *init = &bq->init_data; 763 struct { 764 char *name; 765 bool optional; 766 enum bq25890_table_ids tbl_id; 767 u8 *conv_data; /* holds converted value from given property */ 768 } props[] = { 769 /* required properties */ 770 {"ti,charge-current", false, TBL_ICHG, &init->ichg}, 771 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg}, 772 {"ti,termination-current", false, TBL_ITERM, &init->iterm}, 773 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg}, 774 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin}, 775 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv}, 776 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti}, 777 778 /* optional properties */ 779 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg} 780 }; 781 782 /* initialize data for optional properties */ 783 init->treg = 3; /* 120 degrees Celsius */ 784 785 for (i = 0; i < ARRAY_SIZE(props); i++) { 786 ret = device_property_read_u32(bq->dev, props[i].name, 787 &property); 788 if (ret < 0) { 789 if (props[i].optional) 790 continue; 791 792 dev_err(bq->dev, "Unable to read property %d %s\n", ret, 793 props[i].name); 794 795 return ret; 796 } 797 798 *props[i].conv_data = bq25890_find_idx(property, 799 props[i].tbl_id); 800 } 801 802 return 0; 803 } 804 805 static int bq25890_fw_probe(struct bq25890_device *bq) 806 { 807 int ret; 808 struct bq25890_init_data *init = &bq->init_data; 809 810 ret = bq25890_fw_read_u32_props(bq); 811 if (ret < 0) 812 return ret; 813 814 init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin"); 815 init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq"); 816 817 return 0; 818 } 819 820 static int bq25890_probe(struct i2c_client *client, 821 const struct i2c_device_id *id) 822 { 823 struct i2c_adapter *adapter = client->adapter; 824 struct device *dev = &client->dev; 825 struct bq25890_device *bq; 826 int ret; 827 int i; 828 829 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 830 dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); 831 return -ENODEV; 832 } 833 834 bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL); 835 if (!bq) 836 return -ENOMEM; 837 838 bq->client = client; 839 bq->dev = dev; 840 841 mutex_init(&bq->lock); 842 843 bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config); 844 if (IS_ERR(bq->rmap)) { 845 dev_err(dev, "failed to allocate register map\n"); 846 return PTR_ERR(bq->rmap); 847 } 848 849 for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) { 850 const struct reg_field *reg_fields = bq25890_reg_fields; 851 852 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap, 853 reg_fields[i]); 854 if (IS_ERR(bq->rmap_fields[i])) { 855 dev_err(dev, "cannot allocate regmap field\n"); 856 return PTR_ERR(bq->rmap_fields[i]); 857 } 858 } 859 860 i2c_set_clientdata(client, bq); 861 862 bq->chip_id = bq25890_field_read(bq, F_PN); 863 if (bq->chip_id < 0) { 864 dev_err(dev, "Cannot read chip ID.\n"); 865 return bq->chip_id; 866 } 867 868 if ((bq->chip_id != BQ25890_ID) && (bq->chip_id != BQ25895_ID) 869 && (bq->chip_id != BQ25896_ID)) { 870 dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id); 871 return -ENODEV; 872 } 873 874 if (!dev->platform_data) { 875 ret = bq25890_fw_probe(bq); 876 if (ret < 0) { 877 dev_err(dev, "Cannot read device properties.\n"); 878 return ret; 879 } 880 } else { 881 return -ENODEV; 882 } 883 884 ret = bq25890_hw_init(bq); 885 if (ret < 0) { 886 dev_err(dev, "Cannot initialize the chip.\n"); 887 return ret; 888 } 889 890 if (client->irq <= 0) 891 client->irq = bq25890_irq_probe(bq); 892 893 if (client->irq < 0) { 894 dev_err(dev, "No irq resource found.\n"); 895 return client->irq; 896 } 897 898 /* OTG reporting */ 899 bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 900 if (!IS_ERR_OR_NULL(bq->usb_phy)) { 901 INIT_WORK(&bq->usb_work, bq25890_usb_work); 902 bq->usb_nb.notifier_call = bq25890_usb_notifier; 903 usb_register_notifier(bq->usb_phy, &bq->usb_nb); 904 } 905 906 ret = devm_request_threaded_irq(dev, client->irq, NULL, 907 bq25890_irq_handler_thread, 908 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 909 BQ25890_IRQ_PIN, bq); 910 if (ret) 911 goto irq_fail; 912 913 ret = bq25890_power_supply_init(bq); 914 if (ret < 0) { 915 dev_err(dev, "Failed to register power supply\n"); 916 goto irq_fail; 917 } 918 919 return 0; 920 921 irq_fail: 922 if (!IS_ERR_OR_NULL(bq->usb_phy)) 923 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); 924 925 return ret; 926 } 927 928 static int bq25890_remove(struct i2c_client *client) 929 { 930 struct bq25890_device *bq = i2c_get_clientdata(client); 931 932 power_supply_unregister(bq->charger); 933 934 if (!IS_ERR_OR_NULL(bq->usb_phy)) 935 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); 936 937 /* reset all registers to default values */ 938 bq25890_chip_reset(bq); 939 940 return 0; 941 } 942 943 #ifdef CONFIG_PM_SLEEP 944 static int bq25890_suspend(struct device *dev) 945 { 946 struct bq25890_device *bq = dev_get_drvdata(dev); 947 948 /* 949 * If charger is removed, while in suspend, make sure ADC is diabled 950 * since it consumes slightly more power. 951 */ 952 return bq25890_field_write(bq, F_CONV_START, 0); 953 } 954 955 static int bq25890_resume(struct device *dev) 956 { 957 int ret; 958 struct bq25890_state state; 959 struct bq25890_device *bq = dev_get_drvdata(dev); 960 961 ret = bq25890_get_chip_state(bq, &state); 962 if (ret < 0) 963 return ret; 964 965 mutex_lock(&bq->lock); 966 bq->state = state; 967 mutex_unlock(&bq->lock); 968 969 /* Re-enable ADC only if charger is plugged in. */ 970 if (state.online) { 971 ret = bq25890_field_write(bq, F_CONV_START, 1); 972 if (ret < 0) 973 return ret; 974 } 975 976 /* signal userspace, maybe state changed while suspended */ 977 power_supply_changed(bq->charger); 978 979 return 0; 980 } 981 #endif 982 983 static const struct dev_pm_ops bq25890_pm = { 984 SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume) 985 }; 986 987 static const struct i2c_device_id bq25890_i2c_ids[] = { 988 { "bq25890", 0 }, 989 {}, 990 }; 991 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids); 992 993 static const struct of_device_id bq25890_of_match[] = { 994 { .compatible = "ti,bq25890", }, 995 { }, 996 }; 997 MODULE_DEVICE_TABLE(of, bq25890_of_match); 998 999 static const struct acpi_device_id bq25890_acpi_match[] = { 1000 {"BQ258900", 0}, 1001 {}, 1002 }; 1003 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match); 1004 1005 static struct i2c_driver bq25890_driver = { 1006 .driver = { 1007 .name = "bq25890-charger", 1008 .of_match_table = of_match_ptr(bq25890_of_match), 1009 .acpi_match_table = ACPI_PTR(bq25890_acpi_match), 1010 .pm = &bq25890_pm, 1011 }, 1012 .probe = bq25890_probe, 1013 .remove = bq25890_remove, 1014 .id_table = bq25890_i2c_ids, 1015 }; 1016 module_i2c_driver(bq25890_driver); 1017 1018 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); 1019 MODULE_DESCRIPTION("bq25890 charger driver"); 1020 MODULE_LICENSE("GPL"); 1021