1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * TI BQ25890 charger driver 4 * 5 * Copyright (C) 2015 Intel Corporation 6 */ 7 8 #include <linux/module.h> 9 #include <linux/i2c.h> 10 #include <linux/power_supply.h> 11 #include <linux/regmap.h> 12 #include <linux/types.h> 13 #include <linux/gpio/consumer.h> 14 #include <linux/interrupt.h> 15 #include <linux/delay.h> 16 #include <linux/usb/phy.h> 17 18 #include <linux/acpi.h> 19 #include <linux/of.h> 20 21 #define BQ25890_MANUFACTURER "Texas Instruments" 22 #define BQ25890_IRQ_PIN "bq25890_irq" 23 24 #define BQ25890_ID 3 25 #define BQ25895_ID 7 26 #define BQ25896_ID 0 27 28 enum bq25890_chip_version { 29 BQ25890, 30 BQ25892, 31 BQ25895, 32 BQ25896, 33 }; 34 35 enum bq25890_fields { 36 F_EN_HIZ, F_EN_ILIM, F_IILIM, /* Reg00 */ 37 F_BHOT, F_BCOLD, F_VINDPM_OFS, /* Reg01 */ 38 F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN, 39 F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN, /* Reg02 */ 40 F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN, 41 F_MIN_VBAT_SEL, /* Reg03 */ 42 F_PUMPX_EN, F_ICHG, /* Reg04 */ 43 F_IPRECHG, F_ITERM, /* Reg05 */ 44 F_VREG, F_BATLOWV, F_VRECHG, /* Reg06 */ 45 F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR, 46 F_JEITA_ISET, /* Reg07 */ 47 F_BATCMP, F_VCLAMP, F_TREG, /* Reg08 */ 48 F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET, 49 F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN, /* Reg09 */ 50 F_BOOSTV, F_PFM_OTG_DIS, F_BOOSTI, /* Reg0A */ 51 F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_0B_RSVD, 52 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 enum bq25890_chip_version chip_version; 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, 0x14), 124 }; 125 126 static const struct regmap_access_table bq25890_volatile_regs = { 127 .yes_ranges = bq25890_volatile_reg_ranges, 128 .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges), 129 }; 130 131 static const struct regmap_config bq25890_regmap_config = { 132 .reg_bits = 8, 133 .val_bits = 8, 134 135 .max_register = 0x14, 136 .cache_type = REGCACHE_RBTREE, 137 138 .wr_table = &bq25890_writeable_regs, 139 .volatile_table = &bq25890_volatile_regs, 140 }; 141 142 static const struct reg_field bq25890_reg_fields[] = { 143 /* REG00 */ 144 [F_EN_HIZ] = REG_FIELD(0x00, 7, 7), 145 [F_EN_ILIM] = REG_FIELD(0x00, 6, 6), 146 [F_IILIM] = REG_FIELD(0x00, 0, 5), 147 /* REG01 */ 148 [F_BHOT] = REG_FIELD(0x01, 6, 7), 149 [F_BCOLD] = REG_FIELD(0x01, 5, 5), 150 [F_VINDPM_OFS] = REG_FIELD(0x01, 0, 4), 151 /* REG02 */ 152 [F_CONV_START] = REG_FIELD(0x02, 7, 7), 153 [F_CONV_RATE] = REG_FIELD(0x02, 6, 6), 154 [F_BOOSTF] = REG_FIELD(0x02, 5, 5), 155 [F_ICO_EN] = REG_FIELD(0x02, 4, 4), 156 [F_HVDCP_EN] = REG_FIELD(0x02, 3, 3), // reserved on BQ25896 157 [F_MAXC_EN] = REG_FIELD(0x02, 2, 2), // reserved on BQ25896 158 [F_FORCE_DPM] = REG_FIELD(0x02, 1, 1), 159 [F_AUTO_DPDM_EN] = REG_FIELD(0x02, 0, 0), 160 /* REG03 */ 161 [F_BAT_LOAD_EN] = REG_FIELD(0x03, 7, 7), 162 [F_WD_RST] = REG_FIELD(0x03, 6, 6), 163 [F_OTG_CFG] = REG_FIELD(0x03, 5, 5), 164 [F_CHG_CFG] = REG_FIELD(0x03, 4, 4), 165 [F_SYSVMIN] = REG_FIELD(0x03, 1, 3), 166 [F_MIN_VBAT_SEL] = REG_FIELD(0x03, 0, 0), // BQ25896 only 167 /* REG04 */ 168 [F_PUMPX_EN] = REG_FIELD(0x04, 7, 7), 169 [F_ICHG] = REG_FIELD(0x04, 0, 6), 170 /* REG05 */ 171 [F_IPRECHG] = REG_FIELD(0x05, 4, 7), 172 [F_ITERM] = REG_FIELD(0x05, 0, 3), 173 /* REG06 */ 174 [F_VREG] = REG_FIELD(0x06, 2, 7), 175 [F_BATLOWV] = REG_FIELD(0x06, 1, 1), 176 [F_VRECHG] = REG_FIELD(0x06, 0, 0), 177 /* REG07 */ 178 [F_TERM_EN] = REG_FIELD(0x07, 7, 7), 179 [F_STAT_DIS] = REG_FIELD(0x07, 6, 6), 180 [F_WD] = REG_FIELD(0x07, 4, 5), 181 [F_TMR_EN] = REG_FIELD(0x07, 3, 3), 182 [F_CHG_TMR] = REG_FIELD(0x07, 1, 2), 183 [F_JEITA_ISET] = REG_FIELD(0x07, 0, 0), // reserved on BQ25895 184 /* REG08 */ 185 [F_BATCMP] = REG_FIELD(0x08, 5, 7), 186 [F_VCLAMP] = REG_FIELD(0x08, 2, 4), 187 [F_TREG] = REG_FIELD(0x08, 0, 1), 188 /* REG09 */ 189 [F_FORCE_ICO] = REG_FIELD(0x09, 7, 7), 190 [F_TMR2X_EN] = REG_FIELD(0x09, 6, 6), 191 [F_BATFET_DIS] = REG_FIELD(0x09, 5, 5), 192 [F_JEITA_VSET] = REG_FIELD(0x09, 4, 4), // reserved on BQ25895 193 [F_BATFET_DLY] = REG_FIELD(0x09, 3, 3), 194 [F_BATFET_RST_EN] = REG_FIELD(0x09, 2, 2), 195 [F_PUMPX_UP] = REG_FIELD(0x09, 1, 1), 196 [F_PUMPX_DN] = REG_FIELD(0x09, 0, 0), 197 /* REG0A */ 198 [F_BOOSTV] = REG_FIELD(0x0A, 4, 7), 199 [F_BOOSTI] = REG_FIELD(0x0A, 0, 2), // reserved on BQ25895 200 [F_PFM_OTG_DIS] = REG_FIELD(0x0A, 3, 3), // BQ25896 only 201 /* REG0B */ 202 [F_VBUS_STAT] = REG_FIELD(0x0B, 5, 7), 203 [F_CHG_STAT] = REG_FIELD(0x0B, 3, 4), 204 [F_PG_STAT] = REG_FIELD(0x0B, 2, 2), 205 [F_SDP_STAT] = REG_FIELD(0x0B, 1, 1), // reserved on BQ25896 206 [F_VSYS_STAT] = REG_FIELD(0x0B, 0, 0), 207 /* REG0C */ 208 [F_WD_FAULT] = REG_FIELD(0x0C, 7, 7), 209 [F_BOOST_FAULT] = REG_FIELD(0x0C, 6, 6), 210 [F_CHG_FAULT] = REG_FIELD(0x0C, 4, 5), 211 [F_BAT_FAULT] = REG_FIELD(0x0C, 3, 3), 212 [F_NTC_FAULT] = REG_FIELD(0x0C, 0, 2), 213 /* REG0D */ 214 [F_FORCE_VINDPM] = REG_FIELD(0x0D, 7, 7), 215 [F_VINDPM] = REG_FIELD(0x0D, 0, 6), 216 /* REG0E */ 217 [F_THERM_STAT] = REG_FIELD(0x0E, 7, 7), 218 [F_BATV] = REG_FIELD(0x0E, 0, 6), 219 /* REG0F */ 220 [F_SYSV] = REG_FIELD(0x0F, 0, 6), 221 /* REG10 */ 222 [F_TSPCT] = REG_FIELD(0x10, 0, 6), 223 /* REG11 */ 224 [F_VBUS_GD] = REG_FIELD(0x11, 7, 7), 225 [F_VBUSV] = REG_FIELD(0x11, 0, 6), 226 /* REG12 */ 227 [F_ICHGR] = REG_FIELD(0x12, 0, 6), 228 /* REG13 */ 229 [F_VDPM_STAT] = REG_FIELD(0x13, 7, 7), 230 [F_IDPM_STAT] = REG_FIELD(0x13, 6, 6), 231 [F_IDPM_LIM] = REG_FIELD(0x13, 0, 5), 232 /* REG14 */ 233 [F_REG_RST] = REG_FIELD(0x14, 7, 7), 234 [F_ICO_OPTIMIZED] = REG_FIELD(0x14, 6, 6), 235 [F_PN] = REG_FIELD(0x14, 3, 5), 236 [F_TS_PROFILE] = REG_FIELD(0x14, 2, 2), 237 [F_DEV_REV] = REG_FIELD(0x14, 0, 1) 238 }; 239 240 /* 241 * Most of the val -> idx conversions can be computed, given the minimum, 242 * maximum and the step between values. For the rest of conversions, we use 243 * lookup tables. 244 */ 245 enum bq25890_table_ids { 246 /* range tables */ 247 TBL_ICHG, 248 TBL_ITERM, 249 TBL_VREG, 250 TBL_BOOSTV, 251 TBL_SYSVMIN, 252 253 /* lookup tables */ 254 TBL_TREG, 255 TBL_BOOSTI, 256 }; 257 258 /* Thermal Regulation Threshold lookup table, in degrees Celsius */ 259 static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 }; 260 261 #define BQ25890_TREG_TBL_SIZE ARRAY_SIZE(bq25890_treg_tbl) 262 263 /* Boost mode current limit lookup table, in uA */ 264 static const u32 bq25890_boosti_tbl[] = { 265 500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000 266 }; 267 268 #define BQ25890_BOOSTI_TBL_SIZE ARRAY_SIZE(bq25890_boosti_tbl) 269 270 struct bq25890_range { 271 u32 min; 272 u32 max; 273 u32 step; 274 }; 275 276 struct bq25890_lookup { 277 const u32 *tbl; 278 u32 size; 279 }; 280 281 static const union { 282 struct bq25890_range rt; 283 struct bq25890_lookup lt; 284 } bq25890_tables[] = { 285 /* range tables */ 286 /* TODO: BQ25896 has max ICHG 3008 mA */ 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_version == BQ25890) 404 val->strval = "BQ25890"; 405 else if (bq->chip_version == BQ25892) 406 val->strval = "BQ25892"; 407 else if (bq->chip_version == BQ25895) 408 val->strval = "BQ25895"; 409 else if (bq->chip_version == BQ25896) 410 val->strval = "BQ25896"; 411 else 412 val->strval = "UNKNOWN"; 413 414 break; 415 416 case POWER_SUPPLY_PROP_ONLINE: 417 val->intval = state.online; 418 break; 419 420 case POWER_SUPPLY_PROP_HEALTH: 421 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault) 422 val->intval = POWER_SUPPLY_HEALTH_GOOD; 423 else if (state.bat_fault) 424 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 425 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED) 426 val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; 427 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN) 428 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 429 else 430 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 431 break; 432 433 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 434 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */ 435 if (ret < 0) 436 return ret; 437 438 /* converted_val = ADC_val * 50mA (table 10.3.19) */ 439 val->intval = ret * 50000; 440 break; 441 442 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 443 val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG); 444 break; 445 446 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 447 if (!state.online) { 448 val->intval = 0; 449 break; 450 } 451 452 ret = bq25890_field_read(bq, F_BATV); /* read measured value */ 453 if (ret < 0) 454 return ret; 455 456 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ 457 val->intval = 2304000 + ret * 20000; 458 break; 459 460 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: 461 val->intval = bq25890_find_val(bq->init_data.vreg, TBL_VREG); 462 break; 463 464 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: 465 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM); 466 break; 467 468 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 469 ret = bq25890_field_read(bq, F_SYSV); /* read measured value */ 470 if (ret < 0) 471 return ret; 472 473 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ 474 val->intval = 2304000 + ret * 20000; 475 break; 476 477 default: 478 return -EINVAL; 479 } 480 481 return 0; 482 } 483 484 static int bq25890_get_chip_state(struct bq25890_device *bq, 485 struct bq25890_state *state) 486 { 487 int i, ret; 488 489 struct { 490 enum bq25890_fields id; 491 u8 *data; 492 } state_fields[] = { 493 {F_CHG_STAT, &state->chrg_status}, 494 {F_PG_STAT, &state->online}, 495 {F_VSYS_STAT, &state->vsys_status}, 496 {F_BOOST_FAULT, &state->boost_fault}, 497 {F_BAT_FAULT, &state->bat_fault}, 498 {F_CHG_FAULT, &state->chrg_fault} 499 }; 500 501 for (i = 0; i < ARRAY_SIZE(state_fields); i++) { 502 ret = bq25890_field_read(bq, state_fields[i].id); 503 if (ret < 0) 504 return ret; 505 506 *state_fields[i].data = ret; 507 } 508 509 dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n", 510 state->chrg_status, state->online, state->vsys_status, 511 state->chrg_fault, state->boost_fault, state->bat_fault); 512 513 return 0; 514 } 515 516 static bool bq25890_state_changed(struct bq25890_device *bq, 517 struct bq25890_state *new_state) 518 { 519 struct bq25890_state old_state; 520 521 mutex_lock(&bq->lock); 522 old_state = bq->state; 523 mutex_unlock(&bq->lock); 524 525 return (old_state.chrg_status != new_state->chrg_status || 526 old_state.chrg_fault != new_state->chrg_fault || 527 old_state.online != new_state->online || 528 old_state.bat_fault != new_state->bat_fault || 529 old_state.boost_fault != new_state->boost_fault || 530 old_state.vsys_status != new_state->vsys_status); 531 } 532 533 static void bq25890_handle_state_change(struct bq25890_device *bq, 534 struct bq25890_state *new_state) 535 { 536 int ret; 537 struct bq25890_state old_state; 538 539 mutex_lock(&bq->lock); 540 old_state = bq->state; 541 mutex_unlock(&bq->lock); 542 543 if (!new_state->online) { /* power removed */ 544 /* disable ADC */ 545 ret = bq25890_field_write(bq, F_CONV_START, 0); 546 if (ret < 0) 547 goto error; 548 } else if (!old_state.online) { /* power inserted */ 549 /* enable ADC, to have control of charge current/voltage */ 550 ret = bq25890_field_write(bq, F_CONV_START, 1); 551 if (ret < 0) 552 goto error; 553 } 554 555 return; 556 557 error: 558 dev_err(bq->dev, "Error communicating with the chip.\n"); 559 } 560 561 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private) 562 { 563 struct bq25890_device *bq = private; 564 int ret; 565 struct bq25890_state state; 566 567 ret = bq25890_get_chip_state(bq, &state); 568 if (ret < 0) 569 goto handled; 570 571 if (!bq25890_state_changed(bq, &state)) 572 goto handled; 573 574 bq25890_handle_state_change(bq, &state); 575 576 mutex_lock(&bq->lock); 577 bq->state = state; 578 mutex_unlock(&bq->lock); 579 580 power_supply_changed(bq->charger); 581 582 handled: 583 return IRQ_HANDLED; 584 } 585 586 static int bq25890_chip_reset(struct bq25890_device *bq) 587 { 588 int ret; 589 int rst_check_counter = 10; 590 591 ret = bq25890_field_write(bq, F_REG_RST, 1); 592 if (ret < 0) 593 return ret; 594 595 do { 596 ret = bq25890_field_read(bq, F_REG_RST); 597 if (ret < 0) 598 return ret; 599 600 usleep_range(5, 10); 601 } while (ret == 1 && --rst_check_counter); 602 603 if (!rst_check_counter) 604 return -ETIMEDOUT; 605 606 return 0; 607 } 608 609 static int bq25890_hw_init(struct bq25890_device *bq) 610 { 611 int ret; 612 int i; 613 struct bq25890_state state; 614 615 const struct { 616 enum bq25890_fields id; 617 u32 value; 618 } init_data[] = { 619 {F_ICHG, bq->init_data.ichg}, 620 {F_VREG, bq->init_data.vreg}, 621 {F_ITERM, bq->init_data.iterm}, 622 {F_IPRECHG, bq->init_data.iprechg}, 623 {F_SYSVMIN, bq->init_data.sysvmin}, 624 {F_BOOSTV, bq->init_data.boostv}, 625 {F_BOOSTI, bq->init_data.boosti}, 626 {F_BOOSTF, bq->init_data.boostf}, 627 {F_EN_ILIM, bq->init_data.ilim_en}, 628 {F_TREG, bq->init_data.treg} 629 }; 630 631 ret = bq25890_chip_reset(bq); 632 if (ret < 0) { 633 dev_dbg(bq->dev, "Reset failed %d\n", ret); 634 return ret; 635 } 636 637 /* disable watchdog */ 638 ret = bq25890_field_write(bq, F_WD, 0); 639 if (ret < 0) { 640 dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret); 641 return ret; 642 } 643 644 /* initialize currents/voltages and other parameters */ 645 for (i = 0; i < ARRAY_SIZE(init_data); i++) { 646 ret = bq25890_field_write(bq, init_data[i].id, 647 init_data[i].value); 648 if (ret < 0) { 649 dev_dbg(bq->dev, "Writing init data failed %d\n", ret); 650 return ret; 651 } 652 } 653 654 /* Configure ADC for continuous conversions. This does not enable it. */ 655 ret = bq25890_field_write(bq, F_CONV_RATE, 1); 656 if (ret < 0) { 657 dev_dbg(bq->dev, "Config ADC failed %d\n", ret); 658 return ret; 659 } 660 661 ret = bq25890_get_chip_state(bq, &state); 662 if (ret < 0) { 663 dev_dbg(bq->dev, "Get state failed %d\n", ret); 664 return ret; 665 } 666 667 mutex_lock(&bq->lock); 668 bq->state = state; 669 mutex_unlock(&bq->lock); 670 671 return 0; 672 } 673 674 static enum power_supply_property bq25890_power_supply_props[] = { 675 POWER_SUPPLY_PROP_MANUFACTURER, 676 POWER_SUPPLY_PROP_MODEL_NAME, 677 POWER_SUPPLY_PROP_STATUS, 678 POWER_SUPPLY_PROP_ONLINE, 679 POWER_SUPPLY_PROP_HEALTH, 680 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, 681 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 682 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, 683 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 684 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, 685 POWER_SUPPLY_PROP_VOLTAGE_NOW, 686 }; 687 688 static char *bq25890_charger_supplied_to[] = { 689 "main-battery", 690 }; 691 692 static const struct power_supply_desc bq25890_power_supply_desc = { 693 .name = "bq25890-charger", 694 .type = POWER_SUPPLY_TYPE_USB, 695 .properties = bq25890_power_supply_props, 696 .num_properties = ARRAY_SIZE(bq25890_power_supply_props), 697 .get_property = bq25890_power_supply_get_property, 698 }; 699 700 static int bq25890_power_supply_init(struct bq25890_device *bq) 701 { 702 struct power_supply_config psy_cfg = { .drv_data = bq, }; 703 704 psy_cfg.supplied_to = bq25890_charger_supplied_to; 705 psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to); 706 707 bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc, 708 &psy_cfg); 709 710 return PTR_ERR_OR_ZERO(bq->charger); 711 } 712 713 static void bq25890_usb_work(struct work_struct *data) 714 { 715 int ret; 716 struct bq25890_device *bq = 717 container_of(data, struct bq25890_device, usb_work); 718 719 switch (bq->usb_event) { 720 case USB_EVENT_ID: 721 /* Enable boost mode */ 722 ret = bq25890_field_write(bq, F_OTG_CFG, 1); 723 if (ret < 0) 724 goto error; 725 break; 726 727 case USB_EVENT_NONE: 728 /* Disable boost mode */ 729 ret = bq25890_field_write(bq, F_OTG_CFG, 0); 730 if (ret < 0) 731 goto error; 732 733 power_supply_changed(bq->charger); 734 break; 735 } 736 737 return; 738 739 error: 740 dev_err(bq->dev, "Error switching to boost/charger mode.\n"); 741 } 742 743 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val, 744 void *priv) 745 { 746 struct bq25890_device *bq = 747 container_of(nb, struct bq25890_device, usb_nb); 748 749 bq->usb_event = val; 750 queue_work(system_power_efficient_wq, &bq->usb_work); 751 752 return NOTIFY_OK; 753 } 754 755 static int bq25890_get_chip_version(struct bq25890_device *bq) 756 { 757 int id, rev; 758 759 id = bq25890_field_read(bq, F_PN); 760 if (id < 0) { 761 dev_err(bq->dev, "Cannot read chip ID.\n"); 762 return id; 763 } 764 765 rev = bq25890_field_read(bq, F_DEV_REV); 766 if (rev < 0) { 767 dev_err(bq->dev, "Cannot read chip revision.\n"); 768 return rev; 769 } 770 771 switch (id) { 772 case BQ25890_ID: 773 bq->chip_version = BQ25890; 774 break; 775 776 /* BQ25892 and BQ25896 share same ID 0 */ 777 case BQ25896_ID: 778 switch (rev) { 779 case 2: 780 bq->chip_version = BQ25896; 781 break; 782 case 1: 783 bq->chip_version = BQ25892; 784 break; 785 default: 786 dev_err(bq->dev, 787 "Unknown device revision %d, assume BQ25892\n", 788 rev); 789 bq->chip_version = BQ25892; 790 } 791 break; 792 793 case BQ25895_ID: 794 bq->chip_version = BQ25895; 795 break; 796 797 default: 798 dev_err(bq->dev, "Unknown chip ID %d\n", id); 799 return -ENODEV; 800 } 801 802 return 0; 803 } 804 805 static int bq25890_irq_probe(struct bq25890_device *bq) 806 { 807 struct gpio_desc *irq; 808 809 irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN); 810 if (IS_ERR(irq)) { 811 dev_err(bq->dev, "Could not probe irq pin.\n"); 812 return PTR_ERR(irq); 813 } 814 815 return gpiod_to_irq(irq); 816 } 817 818 static int bq25890_fw_read_u32_props(struct bq25890_device *bq) 819 { 820 int ret; 821 u32 property; 822 int i; 823 struct bq25890_init_data *init = &bq->init_data; 824 struct { 825 char *name; 826 bool optional; 827 enum bq25890_table_ids tbl_id; 828 u8 *conv_data; /* holds converted value from given property */ 829 } props[] = { 830 /* required properties */ 831 {"ti,charge-current", false, TBL_ICHG, &init->ichg}, 832 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg}, 833 {"ti,termination-current", false, TBL_ITERM, &init->iterm}, 834 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg}, 835 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin}, 836 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv}, 837 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti}, 838 839 /* optional properties */ 840 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg} 841 }; 842 843 /* initialize data for optional properties */ 844 init->treg = 3; /* 120 degrees Celsius */ 845 846 for (i = 0; i < ARRAY_SIZE(props); i++) { 847 ret = device_property_read_u32(bq->dev, props[i].name, 848 &property); 849 if (ret < 0) { 850 if (props[i].optional) 851 continue; 852 853 dev_err(bq->dev, "Unable to read property %d %s\n", ret, 854 props[i].name); 855 856 return ret; 857 } 858 859 *props[i].conv_data = bq25890_find_idx(property, 860 props[i].tbl_id); 861 } 862 863 return 0; 864 } 865 866 static int bq25890_fw_probe(struct bq25890_device *bq) 867 { 868 int ret; 869 struct bq25890_init_data *init = &bq->init_data; 870 871 ret = bq25890_fw_read_u32_props(bq); 872 if (ret < 0) 873 return ret; 874 875 init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin"); 876 init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq"); 877 878 return 0; 879 } 880 881 static int bq25890_probe(struct i2c_client *client, 882 const struct i2c_device_id *id) 883 { 884 struct i2c_adapter *adapter = client->adapter; 885 struct device *dev = &client->dev; 886 struct bq25890_device *bq; 887 int ret; 888 int i; 889 890 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 891 dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); 892 return -ENODEV; 893 } 894 895 bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL); 896 if (!bq) 897 return -ENOMEM; 898 899 bq->client = client; 900 bq->dev = dev; 901 902 mutex_init(&bq->lock); 903 904 bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config); 905 if (IS_ERR(bq->rmap)) { 906 dev_err(dev, "failed to allocate register map\n"); 907 return PTR_ERR(bq->rmap); 908 } 909 910 for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) { 911 const struct reg_field *reg_fields = bq25890_reg_fields; 912 913 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap, 914 reg_fields[i]); 915 if (IS_ERR(bq->rmap_fields[i])) { 916 dev_err(dev, "cannot allocate regmap field\n"); 917 return PTR_ERR(bq->rmap_fields[i]); 918 } 919 } 920 921 i2c_set_clientdata(client, bq); 922 923 ret = bq25890_get_chip_version(bq); 924 if (ret) { 925 dev_err(dev, "Cannot read chip ID or unknown chip.\n"); 926 return ret; 927 } 928 929 if (!dev->platform_data) { 930 ret = bq25890_fw_probe(bq); 931 if (ret < 0) { 932 dev_err(dev, "Cannot read device properties.\n"); 933 return ret; 934 } 935 } else { 936 return -ENODEV; 937 } 938 939 ret = bq25890_hw_init(bq); 940 if (ret < 0) { 941 dev_err(dev, "Cannot initialize the chip.\n"); 942 return ret; 943 } 944 945 if (client->irq <= 0) 946 client->irq = bq25890_irq_probe(bq); 947 948 if (client->irq < 0) { 949 dev_err(dev, "No irq resource found.\n"); 950 return client->irq; 951 } 952 953 /* OTG reporting */ 954 bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 955 if (!IS_ERR_OR_NULL(bq->usb_phy)) { 956 INIT_WORK(&bq->usb_work, bq25890_usb_work); 957 bq->usb_nb.notifier_call = bq25890_usb_notifier; 958 usb_register_notifier(bq->usb_phy, &bq->usb_nb); 959 } 960 961 ret = devm_request_threaded_irq(dev, client->irq, NULL, 962 bq25890_irq_handler_thread, 963 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 964 BQ25890_IRQ_PIN, bq); 965 if (ret) 966 goto irq_fail; 967 968 ret = bq25890_power_supply_init(bq); 969 if (ret < 0) { 970 dev_err(dev, "Failed to register power supply\n"); 971 goto irq_fail; 972 } 973 974 return 0; 975 976 irq_fail: 977 if (!IS_ERR_OR_NULL(bq->usb_phy)) 978 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); 979 980 return ret; 981 } 982 983 static int bq25890_remove(struct i2c_client *client) 984 { 985 struct bq25890_device *bq = i2c_get_clientdata(client); 986 987 power_supply_unregister(bq->charger); 988 989 if (!IS_ERR_OR_NULL(bq->usb_phy)) 990 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); 991 992 /* reset all registers to default values */ 993 bq25890_chip_reset(bq); 994 995 return 0; 996 } 997 998 #ifdef CONFIG_PM_SLEEP 999 static int bq25890_suspend(struct device *dev) 1000 { 1001 struct bq25890_device *bq = dev_get_drvdata(dev); 1002 1003 /* 1004 * If charger is removed, while in suspend, make sure ADC is diabled 1005 * since it consumes slightly more power. 1006 */ 1007 return bq25890_field_write(bq, F_CONV_START, 0); 1008 } 1009 1010 static int bq25890_resume(struct device *dev) 1011 { 1012 int ret; 1013 struct bq25890_state state; 1014 struct bq25890_device *bq = dev_get_drvdata(dev); 1015 1016 ret = bq25890_get_chip_state(bq, &state); 1017 if (ret < 0) 1018 return ret; 1019 1020 mutex_lock(&bq->lock); 1021 bq->state = state; 1022 mutex_unlock(&bq->lock); 1023 1024 /* Re-enable ADC only if charger is plugged in. */ 1025 if (state.online) { 1026 ret = bq25890_field_write(bq, F_CONV_START, 1); 1027 if (ret < 0) 1028 return ret; 1029 } 1030 1031 /* signal userspace, maybe state changed while suspended */ 1032 power_supply_changed(bq->charger); 1033 1034 return 0; 1035 } 1036 #endif 1037 1038 static const struct dev_pm_ops bq25890_pm = { 1039 SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume) 1040 }; 1041 1042 static const struct i2c_device_id bq25890_i2c_ids[] = { 1043 { "bq25890", 0 }, 1044 { "bq25892", 0 }, 1045 { "bq25895", 0 }, 1046 { "bq25896", 0 }, 1047 {}, 1048 }; 1049 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids); 1050 1051 static const struct of_device_id bq25890_of_match[] = { 1052 { .compatible = "ti,bq25890", }, 1053 { .compatible = "ti,bq25892", }, 1054 { .compatible = "ti,bq25895", }, 1055 { .compatible = "ti,bq25896", }, 1056 { }, 1057 }; 1058 MODULE_DEVICE_TABLE(of, bq25890_of_match); 1059 1060 static const struct acpi_device_id bq25890_acpi_match[] = { 1061 {"BQ258900", 0}, 1062 {}, 1063 }; 1064 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match); 1065 1066 static struct i2c_driver bq25890_driver = { 1067 .driver = { 1068 .name = "bq25890-charger", 1069 .of_match_table = of_match_ptr(bq25890_of_match), 1070 .acpi_match_table = ACPI_PTR(bq25890_acpi_match), 1071 .pm = &bq25890_pm, 1072 }, 1073 .probe = bq25890_probe, 1074 .remove = bq25890_remove, 1075 .id_table = bq25890_i2c_ids, 1076 }; 1077 module_i2c_driver(bq25890_driver); 1078 1079 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); 1080 MODULE_DESCRIPTION("bq25890 charger driver"); 1081 MODULE_LICENSE("GPL"); 1082