1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * TI BQ25890 charger driver 4 * 5 * Copyright (C) 2015 Intel Corporation 6 */ 7 8 #include <linux/module.h> 9 #include <linux/i2c.h> 10 #include <linux/power_supply.h> 11 #include <linux/regmap.h> 12 #include <linux/types.h> 13 #include <linux/gpio/consumer.h> 14 #include <linux/interrupt.h> 15 #include <linux/delay.h> 16 #include <linux/usb/phy.h> 17 18 #include <linux/acpi.h> 19 #include <linux/of.h> 20 21 #define BQ25890_MANUFACTURER "Texas Instruments" 22 #define BQ25890_IRQ_PIN "bq25890_irq" 23 24 #define BQ25890_ID 3 25 #define BQ25895_ID 7 26 #define BQ25896_ID 0 27 28 enum bq25890_chip_version { 29 BQ25890, 30 BQ25892, 31 BQ25895, 32 BQ25896, 33 }; 34 35 static const char *const bq25890_chip_name[] = { 36 "BQ25890", 37 "BQ25892", 38 "BQ25895", 39 "BQ25896", 40 }; 41 42 enum bq25890_fields { 43 F_EN_HIZ, F_EN_ILIM, F_IILIM, /* Reg00 */ 44 F_BHOT, F_BCOLD, F_VINDPM_OFS, /* Reg01 */ 45 F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN, 46 F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN, /* Reg02 */ 47 F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN, 48 F_MIN_VBAT_SEL, /* Reg03 */ 49 F_PUMPX_EN, F_ICHG, /* Reg04 */ 50 F_IPRECHG, F_ITERM, /* Reg05 */ 51 F_VREG, F_BATLOWV, F_VRECHG, /* Reg06 */ 52 F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR, 53 F_JEITA_ISET, /* Reg07 */ 54 F_BATCMP, F_VCLAMP, F_TREG, /* Reg08 */ 55 F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET, 56 F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN, /* Reg09 */ 57 F_BOOSTV, F_PFM_OTG_DIS, F_BOOSTI, /* Reg0A */ 58 F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_0B_RSVD, 59 F_VSYS_STAT, /* Reg0B */ 60 F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT, 61 F_NTC_FAULT, /* Reg0C */ 62 F_FORCE_VINDPM, F_VINDPM, /* Reg0D */ 63 F_THERM_STAT, F_BATV, /* Reg0E */ 64 F_SYSV, /* Reg0F */ 65 F_TSPCT, /* Reg10 */ 66 F_VBUS_GD, F_VBUSV, /* Reg11 */ 67 F_ICHGR, /* Reg12 */ 68 F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM, /* Reg13 */ 69 F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV, /* Reg14 */ 70 71 F_MAX_FIELDS 72 }; 73 74 /* initial field values, converted to register values */ 75 struct bq25890_init_data { 76 u8 ichg; /* charge current */ 77 u8 vreg; /* regulation voltage */ 78 u8 iterm; /* termination current */ 79 u8 iprechg; /* precharge current */ 80 u8 sysvmin; /* minimum system voltage limit */ 81 u8 boostv; /* boost regulation voltage */ 82 u8 boosti; /* boost current limit */ 83 u8 boostf; /* boost frequency */ 84 u8 ilim_en; /* enable ILIM pin */ 85 u8 treg; /* thermal regulation threshold */ 86 u8 rbatcomp; /* IBAT sense resistor value */ 87 u8 vclamp; /* IBAT compensation voltage limit */ 88 }; 89 90 struct bq25890_state { 91 u8 online; 92 u8 chrg_status; 93 u8 chrg_fault; 94 u8 vsys_status; 95 u8 boost_fault; 96 u8 bat_fault; 97 }; 98 99 struct bq25890_device { 100 struct i2c_client *client; 101 struct device *dev; 102 struct power_supply *charger; 103 104 struct usb_phy *usb_phy; 105 struct notifier_block usb_nb; 106 struct work_struct usb_work; 107 unsigned long usb_event; 108 109 struct regmap *rmap; 110 struct regmap_field *rmap_fields[F_MAX_FIELDS]; 111 112 enum bq25890_chip_version chip_version; 113 struct bq25890_init_data init_data; 114 struct bq25890_state state; 115 116 struct mutex lock; /* protect state data */ 117 }; 118 119 static const struct regmap_range bq25890_readonly_reg_ranges[] = { 120 regmap_reg_range(0x0b, 0x0c), 121 regmap_reg_range(0x0e, 0x13), 122 }; 123 124 static const struct regmap_access_table bq25890_writeable_regs = { 125 .no_ranges = bq25890_readonly_reg_ranges, 126 .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges), 127 }; 128 129 static const struct regmap_range bq25890_volatile_reg_ranges[] = { 130 regmap_reg_range(0x00, 0x00), 131 regmap_reg_range(0x02, 0x02), 132 regmap_reg_range(0x09, 0x09), 133 regmap_reg_range(0x0b, 0x14), 134 }; 135 136 static const struct regmap_access_table bq25890_volatile_regs = { 137 .yes_ranges = bq25890_volatile_reg_ranges, 138 .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges), 139 }; 140 141 static const struct regmap_config bq25890_regmap_config = { 142 .reg_bits = 8, 143 .val_bits = 8, 144 145 .max_register = 0x14, 146 .cache_type = REGCACHE_RBTREE, 147 148 .wr_table = &bq25890_writeable_regs, 149 .volatile_table = &bq25890_volatile_regs, 150 }; 151 152 static const struct reg_field bq25890_reg_fields[] = { 153 /* REG00 */ 154 [F_EN_HIZ] = REG_FIELD(0x00, 7, 7), 155 [F_EN_ILIM] = REG_FIELD(0x00, 6, 6), 156 [F_IILIM] = REG_FIELD(0x00, 0, 5), 157 /* REG01 */ 158 [F_BHOT] = REG_FIELD(0x01, 6, 7), 159 [F_BCOLD] = REG_FIELD(0x01, 5, 5), 160 [F_VINDPM_OFS] = REG_FIELD(0x01, 0, 4), 161 /* REG02 */ 162 [F_CONV_START] = REG_FIELD(0x02, 7, 7), 163 [F_CONV_RATE] = REG_FIELD(0x02, 6, 6), 164 [F_BOOSTF] = REG_FIELD(0x02, 5, 5), 165 [F_ICO_EN] = REG_FIELD(0x02, 4, 4), 166 [F_HVDCP_EN] = REG_FIELD(0x02, 3, 3), // reserved on BQ25896 167 [F_MAXC_EN] = REG_FIELD(0x02, 2, 2), // reserved on BQ25896 168 [F_FORCE_DPM] = REG_FIELD(0x02, 1, 1), 169 [F_AUTO_DPDM_EN] = REG_FIELD(0x02, 0, 0), 170 /* REG03 */ 171 [F_BAT_LOAD_EN] = REG_FIELD(0x03, 7, 7), 172 [F_WD_RST] = REG_FIELD(0x03, 6, 6), 173 [F_OTG_CFG] = REG_FIELD(0x03, 5, 5), 174 [F_CHG_CFG] = REG_FIELD(0x03, 4, 4), 175 [F_SYSVMIN] = REG_FIELD(0x03, 1, 3), 176 [F_MIN_VBAT_SEL] = REG_FIELD(0x03, 0, 0), // BQ25896 only 177 /* REG04 */ 178 [F_PUMPX_EN] = REG_FIELD(0x04, 7, 7), 179 [F_ICHG] = REG_FIELD(0x04, 0, 6), 180 /* REG05 */ 181 [F_IPRECHG] = REG_FIELD(0x05, 4, 7), 182 [F_ITERM] = REG_FIELD(0x05, 0, 3), 183 /* REG06 */ 184 [F_VREG] = REG_FIELD(0x06, 2, 7), 185 [F_BATLOWV] = REG_FIELD(0x06, 1, 1), 186 [F_VRECHG] = REG_FIELD(0x06, 0, 0), 187 /* REG07 */ 188 [F_TERM_EN] = REG_FIELD(0x07, 7, 7), 189 [F_STAT_DIS] = REG_FIELD(0x07, 6, 6), 190 [F_WD] = REG_FIELD(0x07, 4, 5), 191 [F_TMR_EN] = REG_FIELD(0x07, 3, 3), 192 [F_CHG_TMR] = REG_FIELD(0x07, 1, 2), 193 [F_JEITA_ISET] = REG_FIELD(0x07, 0, 0), // reserved on BQ25895 194 /* REG08 */ 195 [F_BATCMP] = REG_FIELD(0x08, 5, 7), 196 [F_VCLAMP] = REG_FIELD(0x08, 2, 4), 197 [F_TREG] = REG_FIELD(0x08, 0, 1), 198 /* REG09 */ 199 [F_FORCE_ICO] = REG_FIELD(0x09, 7, 7), 200 [F_TMR2X_EN] = REG_FIELD(0x09, 6, 6), 201 [F_BATFET_DIS] = REG_FIELD(0x09, 5, 5), 202 [F_JEITA_VSET] = REG_FIELD(0x09, 4, 4), // reserved on BQ25895 203 [F_BATFET_DLY] = REG_FIELD(0x09, 3, 3), 204 [F_BATFET_RST_EN] = REG_FIELD(0x09, 2, 2), 205 [F_PUMPX_UP] = REG_FIELD(0x09, 1, 1), 206 [F_PUMPX_DN] = REG_FIELD(0x09, 0, 0), 207 /* REG0A */ 208 [F_BOOSTV] = REG_FIELD(0x0A, 4, 7), 209 [F_BOOSTI] = REG_FIELD(0x0A, 0, 2), // reserved on BQ25895 210 [F_PFM_OTG_DIS] = REG_FIELD(0x0A, 3, 3), // BQ25896 only 211 /* REG0B */ 212 [F_VBUS_STAT] = REG_FIELD(0x0B, 5, 7), 213 [F_CHG_STAT] = REG_FIELD(0x0B, 3, 4), 214 [F_PG_STAT] = REG_FIELD(0x0B, 2, 2), 215 [F_SDP_STAT] = REG_FIELD(0x0B, 1, 1), // reserved on BQ25896 216 [F_VSYS_STAT] = REG_FIELD(0x0B, 0, 0), 217 /* REG0C */ 218 [F_WD_FAULT] = REG_FIELD(0x0C, 7, 7), 219 [F_BOOST_FAULT] = REG_FIELD(0x0C, 6, 6), 220 [F_CHG_FAULT] = REG_FIELD(0x0C, 4, 5), 221 [F_BAT_FAULT] = REG_FIELD(0x0C, 3, 3), 222 [F_NTC_FAULT] = REG_FIELD(0x0C, 0, 2), 223 /* REG0D */ 224 [F_FORCE_VINDPM] = REG_FIELD(0x0D, 7, 7), 225 [F_VINDPM] = REG_FIELD(0x0D, 0, 6), 226 /* REG0E */ 227 [F_THERM_STAT] = REG_FIELD(0x0E, 7, 7), 228 [F_BATV] = REG_FIELD(0x0E, 0, 6), 229 /* REG0F */ 230 [F_SYSV] = REG_FIELD(0x0F, 0, 6), 231 /* REG10 */ 232 [F_TSPCT] = REG_FIELD(0x10, 0, 6), 233 /* REG11 */ 234 [F_VBUS_GD] = REG_FIELD(0x11, 7, 7), 235 [F_VBUSV] = REG_FIELD(0x11, 0, 6), 236 /* REG12 */ 237 [F_ICHGR] = REG_FIELD(0x12, 0, 6), 238 /* REG13 */ 239 [F_VDPM_STAT] = REG_FIELD(0x13, 7, 7), 240 [F_IDPM_STAT] = REG_FIELD(0x13, 6, 6), 241 [F_IDPM_LIM] = REG_FIELD(0x13, 0, 5), 242 /* REG14 */ 243 [F_REG_RST] = REG_FIELD(0x14, 7, 7), 244 [F_ICO_OPTIMIZED] = REG_FIELD(0x14, 6, 6), 245 [F_PN] = REG_FIELD(0x14, 3, 5), 246 [F_TS_PROFILE] = REG_FIELD(0x14, 2, 2), 247 [F_DEV_REV] = REG_FIELD(0x14, 0, 1) 248 }; 249 250 /* 251 * Most of the val -> idx conversions can be computed, given the minimum, 252 * maximum and the step between values. For the rest of conversions, we use 253 * lookup tables. 254 */ 255 enum bq25890_table_ids { 256 /* range tables */ 257 TBL_ICHG, 258 TBL_ITERM, 259 TBL_IILIM, 260 TBL_VREG, 261 TBL_BOOSTV, 262 TBL_SYSVMIN, 263 TBL_VBATCOMP, 264 TBL_RBATCOMP, 265 266 /* lookup tables */ 267 TBL_TREG, 268 TBL_BOOSTI, 269 }; 270 271 /* Thermal Regulation Threshold lookup table, in degrees Celsius */ 272 static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 }; 273 274 #define BQ25890_TREG_TBL_SIZE ARRAY_SIZE(bq25890_treg_tbl) 275 276 /* Boost mode current limit lookup table, in uA */ 277 static const u32 bq25890_boosti_tbl[] = { 278 500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000 279 }; 280 281 #define BQ25890_BOOSTI_TBL_SIZE ARRAY_SIZE(bq25890_boosti_tbl) 282 283 struct bq25890_range { 284 u32 min; 285 u32 max; 286 u32 step; 287 }; 288 289 struct bq25890_lookup { 290 const u32 *tbl; 291 u32 size; 292 }; 293 294 static const union { 295 struct bq25890_range rt; 296 struct bq25890_lookup lt; 297 } bq25890_tables[] = { 298 /* range tables */ 299 /* TODO: BQ25896 has max ICHG 3008 mA */ 300 [TBL_ICHG] = { .rt = {0, 5056000, 64000} }, /* uA */ 301 [TBL_ITERM] = { .rt = {64000, 1024000, 64000} }, /* uA */ 302 [TBL_IILIM] = { .rt = {100000, 3250000, 50000} }, /* uA */ 303 [TBL_VREG] = { .rt = {3840000, 4608000, 16000} }, /* uV */ 304 [TBL_BOOSTV] = { .rt = {4550000, 5510000, 64000} }, /* uV */ 305 [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} }, /* uV */ 306 [TBL_VBATCOMP] ={ .rt = {0, 224000, 32000} }, /* uV */ 307 [TBL_RBATCOMP] ={ .rt = {0, 140000, 20000} }, /* uOhm */ 308 309 /* lookup tables */ 310 [TBL_TREG] = { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} }, 311 [TBL_BOOSTI] = { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} } 312 }; 313 314 static int bq25890_field_read(struct bq25890_device *bq, 315 enum bq25890_fields field_id) 316 { 317 int ret; 318 int val; 319 320 ret = regmap_field_read(bq->rmap_fields[field_id], &val); 321 if (ret < 0) 322 return ret; 323 324 return val; 325 } 326 327 static int bq25890_field_write(struct bq25890_device *bq, 328 enum bq25890_fields field_id, u8 val) 329 { 330 return regmap_field_write(bq->rmap_fields[field_id], val); 331 } 332 333 static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id) 334 { 335 u8 idx; 336 337 if (id >= TBL_TREG) { 338 const u32 *tbl = bq25890_tables[id].lt.tbl; 339 u32 tbl_size = bq25890_tables[id].lt.size; 340 341 for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++) 342 ; 343 } else { 344 const struct bq25890_range *rtbl = &bq25890_tables[id].rt; 345 u8 rtbl_size; 346 347 rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1; 348 349 for (idx = 1; 350 idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value); 351 idx++) 352 ; 353 } 354 355 return idx - 1; 356 } 357 358 static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id) 359 { 360 const struct bq25890_range *rtbl; 361 362 /* lookup table? */ 363 if (id >= TBL_TREG) 364 return bq25890_tables[id].lt.tbl[idx]; 365 366 /* range table */ 367 rtbl = &bq25890_tables[id].rt; 368 369 return (rtbl->min + idx * rtbl->step); 370 } 371 372 enum bq25890_status { 373 STATUS_NOT_CHARGING, 374 STATUS_PRE_CHARGING, 375 STATUS_FAST_CHARGING, 376 STATUS_TERMINATION_DONE, 377 }; 378 379 enum bq25890_chrg_fault { 380 CHRG_FAULT_NORMAL, 381 CHRG_FAULT_INPUT, 382 CHRG_FAULT_THERMAL_SHUTDOWN, 383 CHRG_FAULT_TIMER_EXPIRED, 384 }; 385 386 static bool bq25890_is_adc_property(enum power_supply_property psp) 387 { 388 switch (psp) { 389 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 390 case POWER_SUPPLY_PROP_CURRENT_NOW: 391 return true; 392 393 default: 394 return false; 395 } 396 } 397 398 static irqreturn_t __bq25890_handle_irq(struct bq25890_device *bq); 399 400 static int bq25890_power_supply_get_property(struct power_supply *psy, 401 enum power_supply_property psp, 402 union power_supply_propval *val) 403 { 404 struct bq25890_device *bq = power_supply_get_drvdata(psy); 405 struct bq25890_state state; 406 bool do_adc_conv; 407 int ret; 408 409 mutex_lock(&bq->lock); 410 /* update state in case we lost an interrupt */ 411 __bq25890_handle_irq(bq); 412 state = bq->state; 413 do_adc_conv = !state.online && bq25890_is_adc_property(psp); 414 if (do_adc_conv) 415 bq25890_field_write(bq, F_CONV_START, 1); 416 mutex_unlock(&bq->lock); 417 418 if (do_adc_conv) 419 regmap_field_read_poll_timeout(bq->rmap_fields[F_CONV_START], 420 ret, !ret, 25000, 1000000); 421 422 switch (psp) { 423 case POWER_SUPPLY_PROP_STATUS: 424 if (!state.online) 425 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 426 else if (state.chrg_status == STATUS_NOT_CHARGING) 427 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 428 else if (state.chrg_status == STATUS_PRE_CHARGING || 429 state.chrg_status == STATUS_FAST_CHARGING) 430 val->intval = POWER_SUPPLY_STATUS_CHARGING; 431 else if (state.chrg_status == STATUS_TERMINATION_DONE) 432 val->intval = POWER_SUPPLY_STATUS_FULL; 433 else 434 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 435 436 break; 437 438 case POWER_SUPPLY_PROP_CHARGE_TYPE: 439 if (!state.online || state.chrg_status == STATUS_NOT_CHARGING || 440 state.chrg_status == STATUS_TERMINATION_DONE) 441 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; 442 else if (state.chrg_status == STATUS_PRE_CHARGING) 443 val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD; 444 else if (state.chrg_status == STATUS_FAST_CHARGING) 445 val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST; 446 else /* unreachable */ 447 val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; 448 break; 449 450 case POWER_SUPPLY_PROP_MANUFACTURER: 451 val->strval = BQ25890_MANUFACTURER; 452 break; 453 454 case POWER_SUPPLY_PROP_MODEL_NAME: 455 val->strval = bq25890_chip_name[bq->chip_version]; 456 break; 457 458 case POWER_SUPPLY_PROP_ONLINE: 459 val->intval = state.online; 460 break; 461 462 case POWER_SUPPLY_PROP_HEALTH: 463 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault) 464 val->intval = POWER_SUPPLY_HEALTH_GOOD; 465 else if (state.bat_fault) 466 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 467 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED) 468 val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; 469 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN) 470 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 471 else 472 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 473 break; 474 475 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 476 val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG); 477 break; 478 479 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 480 if (!state.online) { 481 val->intval = 0; 482 break; 483 } 484 485 ret = bq25890_field_read(bq, F_BATV); /* read measured value */ 486 if (ret < 0) 487 return ret; 488 489 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ 490 val->intval = 2304000 + ret * 20000; 491 break; 492 493 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: 494 val->intval = bq25890_find_val(bq->init_data.vreg, TBL_VREG); 495 break; 496 497 case POWER_SUPPLY_PROP_PRECHARGE_CURRENT: 498 val->intval = bq25890_find_val(bq->init_data.iprechg, TBL_ITERM); 499 break; 500 501 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: 502 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM); 503 break; 504 505 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 506 ret = bq25890_field_read(bq, F_IILIM); 507 if (ret < 0) 508 return ret; 509 510 val->intval = bq25890_find_val(ret, TBL_IILIM); 511 break; 512 513 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 514 ret = bq25890_field_read(bq, F_SYSV); /* read measured value */ 515 if (ret < 0) 516 return ret; 517 518 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ 519 val->intval = 2304000 + ret * 20000; 520 break; 521 522 case POWER_SUPPLY_PROP_CURRENT_NOW: 523 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */ 524 if (ret < 0) 525 return ret; 526 527 /* converted_val = ADC_val * 50mA (table 10.3.19) */ 528 val->intval = ret * -50000; 529 break; 530 531 default: 532 return -EINVAL; 533 } 534 535 return 0; 536 } 537 538 static int bq25890_get_chip_state(struct bq25890_device *bq, 539 struct bq25890_state *state) 540 { 541 int i, ret; 542 543 struct { 544 enum bq25890_fields id; 545 u8 *data; 546 } state_fields[] = { 547 {F_CHG_STAT, &state->chrg_status}, 548 {F_PG_STAT, &state->online}, 549 {F_VSYS_STAT, &state->vsys_status}, 550 {F_BOOST_FAULT, &state->boost_fault}, 551 {F_BAT_FAULT, &state->bat_fault}, 552 {F_CHG_FAULT, &state->chrg_fault} 553 }; 554 555 for (i = 0; i < ARRAY_SIZE(state_fields); i++) { 556 ret = bq25890_field_read(bq, state_fields[i].id); 557 if (ret < 0) 558 return ret; 559 560 *state_fields[i].data = ret; 561 } 562 563 dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n", 564 state->chrg_status, state->online, state->vsys_status, 565 state->chrg_fault, state->boost_fault, state->bat_fault); 566 567 return 0; 568 } 569 570 static irqreturn_t __bq25890_handle_irq(struct bq25890_device *bq) 571 { 572 struct bq25890_state new_state; 573 int ret; 574 575 ret = bq25890_get_chip_state(bq, &new_state); 576 if (ret < 0) 577 return IRQ_NONE; 578 579 if (!memcmp(&bq->state, &new_state, sizeof(new_state))) 580 return IRQ_NONE; 581 582 if (!new_state.online && bq->state.online) { /* power removed */ 583 /* disable ADC */ 584 ret = bq25890_field_write(bq, F_CONV_START, 0); 585 if (ret < 0) 586 goto error; 587 } else if (new_state.online && !bq->state.online) { /* power inserted */ 588 /* enable ADC, to have control of charge current/voltage */ 589 ret = bq25890_field_write(bq, F_CONV_START, 1); 590 if (ret < 0) 591 goto error; 592 } 593 594 bq->state = new_state; 595 power_supply_changed(bq->charger); 596 597 return IRQ_HANDLED; 598 error: 599 dev_err(bq->dev, "Error communicating with the chip: %pe\n", 600 ERR_PTR(ret)); 601 return IRQ_HANDLED; 602 } 603 604 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private) 605 { 606 struct bq25890_device *bq = private; 607 irqreturn_t ret; 608 609 mutex_lock(&bq->lock); 610 ret = __bq25890_handle_irq(bq); 611 mutex_unlock(&bq->lock); 612 613 return ret; 614 } 615 616 static int bq25890_chip_reset(struct bq25890_device *bq) 617 { 618 int ret; 619 int rst_check_counter = 10; 620 621 ret = bq25890_field_write(bq, F_REG_RST, 1); 622 if (ret < 0) 623 return ret; 624 625 do { 626 ret = bq25890_field_read(bq, F_REG_RST); 627 if (ret < 0) 628 return ret; 629 630 usleep_range(5, 10); 631 } while (ret == 1 && --rst_check_counter); 632 633 if (!rst_check_counter) 634 return -ETIMEDOUT; 635 636 return 0; 637 } 638 639 static int bq25890_hw_init(struct bq25890_device *bq) 640 { 641 int ret; 642 int i; 643 644 const struct { 645 enum bq25890_fields id; 646 u32 value; 647 } init_data[] = { 648 {F_ICHG, bq->init_data.ichg}, 649 {F_VREG, bq->init_data.vreg}, 650 {F_ITERM, bq->init_data.iterm}, 651 {F_IPRECHG, bq->init_data.iprechg}, 652 {F_SYSVMIN, bq->init_data.sysvmin}, 653 {F_BOOSTV, bq->init_data.boostv}, 654 {F_BOOSTI, bq->init_data.boosti}, 655 {F_BOOSTF, bq->init_data.boostf}, 656 {F_EN_ILIM, bq->init_data.ilim_en}, 657 {F_TREG, bq->init_data.treg}, 658 {F_BATCMP, bq->init_data.rbatcomp}, 659 {F_VCLAMP, bq->init_data.vclamp}, 660 }; 661 662 ret = bq25890_chip_reset(bq); 663 if (ret < 0) { 664 dev_dbg(bq->dev, "Reset failed %d\n", ret); 665 return ret; 666 } 667 668 /* disable watchdog */ 669 ret = bq25890_field_write(bq, F_WD, 0); 670 if (ret < 0) { 671 dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret); 672 return ret; 673 } 674 675 /* initialize currents/voltages and other parameters */ 676 for (i = 0; i < ARRAY_SIZE(init_data); i++) { 677 ret = bq25890_field_write(bq, init_data[i].id, 678 init_data[i].value); 679 if (ret < 0) { 680 dev_dbg(bq->dev, "Writing init data failed %d\n", ret); 681 return ret; 682 } 683 } 684 685 /* Configure ADC for continuous conversions when charging */ 686 ret = bq25890_field_write(bq, F_CONV_RATE, !!bq->state.online); 687 if (ret < 0) { 688 dev_dbg(bq->dev, "Config ADC failed %d\n", ret); 689 return ret; 690 } 691 692 ret = bq25890_get_chip_state(bq, &bq->state); 693 if (ret < 0) { 694 dev_dbg(bq->dev, "Get state failed %d\n", ret); 695 return ret; 696 } 697 698 return 0; 699 } 700 701 static const enum power_supply_property bq25890_power_supply_props[] = { 702 POWER_SUPPLY_PROP_MANUFACTURER, 703 POWER_SUPPLY_PROP_MODEL_NAME, 704 POWER_SUPPLY_PROP_STATUS, 705 POWER_SUPPLY_PROP_CHARGE_TYPE, 706 POWER_SUPPLY_PROP_ONLINE, 707 POWER_SUPPLY_PROP_HEALTH, 708 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 709 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, 710 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 711 POWER_SUPPLY_PROP_PRECHARGE_CURRENT, 712 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, 713 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, 714 POWER_SUPPLY_PROP_VOLTAGE_NOW, 715 POWER_SUPPLY_PROP_CURRENT_NOW, 716 }; 717 718 static char *bq25890_charger_supplied_to[] = { 719 "main-battery", 720 }; 721 722 static const struct power_supply_desc bq25890_power_supply_desc = { 723 .name = "bq25890-charger", 724 .type = POWER_SUPPLY_TYPE_USB, 725 .properties = bq25890_power_supply_props, 726 .num_properties = ARRAY_SIZE(bq25890_power_supply_props), 727 .get_property = bq25890_power_supply_get_property, 728 }; 729 730 static int bq25890_power_supply_init(struct bq25890_device *bq) 731 { 732 struct power_supply_config psy_cfg = { .drv_data = bq, }; 733 734 psy_cfg.supplied_to = bq25890_charger_supplied_to; 735 psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to); 736 737 bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc, 738 &psy_cfg); 739 740 return PTR_ERR_OR_ZERO(bq->charger); 741 } 742 743 static void bq25890_usb_work(struct work_struct *data) 744 { 745 int ret; 746 struct bq25890_device *bq = 747 container_of(data, struct bq25890_device, usb_work); 748 749 switch (bq->usb_event) { 750 case USB_EVENT_ID: 751 /* Enable boost mode */ 752 ret = bq25890_field_write(bq, F_OTG_CFG, 1); 753 if (ret < 0) 754 goto error; 755 break; 756 757 case USB_EVENT_NONE: 758 /* Disable boost mode */ 759 ret = bq25890_field_write(bq, F_OTG_CFG, 0); 760 if (ret < 0) 761 goto error; 762 763 power_supply_changed(bq->charger); 764 break; 765 } 766 767 return; 768 769 error: 770 dev_err(bq->dev, "Error switching to boost/charger mode.\n"); 771 } 772 773 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val, 774 void *priv) 775 { 776 struct bq25890_device *bq = 777 container_of(nb, struct bq25890_device, usb_nb); 778 779 bq->usb_event = val; 780 queue_work(system_power_efficient_wq, &bq->usb_work); 781 782 return NOTIFY_OK; 783 } 784 785 static int bq25890_get_chip_version(struct bq25890_device *bq) 786 { 787 int id, rev; 788 789 id = bq25890_field_read(bq, F_PN); 790 if (id < 0) { 791 dev_err(bq->dev, "Cannot read chip ID.\n"); 792 return id; 793 } 794 795 rev = bq25890_field_read(bq, F_DEV_REV); 796 if (rev < 0) { 797 dev_err(bq->dev, "Cannot read chip revision.\n"); 798 return rev; 799 } 800 801 switch (id) { 802 case BQ25890_ID: 803 bq->chip_version = BQ25890; 804 break; 805 806 /* BQ25892 and BQ25896 share same ID 0 */ 807 case BQ25896_ID: 808 switch (rev) { 809 case 2: 810 bq->chip_version = BQ25896; 811 break; 812 case 1: 813 bq->chip_version = BQ25892; 814 break; 815 default: 816 dev_err(bq->dev, 817 "Unknown device revision %d, assume BQ25892\n", 818 rev); 819 bq->chip_version = BQ25892; 820 } 821 break; 822 823 case BQ25895_ID: 824 bq->chip_version = BQ25895; 825 break; 826 827 default: 828 dev_err(bq->dev, "Unknown chip ID %d\n", id); 829 return -ENODEV; 830 } 831 832 return 0; 833 } 834 835 static int bq25890_irq_probe(struct bq25890_device *bq) 836 { 837 struct gpio_desc *irq; 838 839 irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN); 840 if (IS_ERR(irq)) { 841 dev_err(bq->dev, "Could not probe irq pin.\n"); 842 return PTR_ERR(irq); 843 } 844 845 return gpiod_to_irq(irq); 846 } 847 848 static int bq25890_fw_read_u32_props(struct bq25890_device *bq) 849 { 850 int ret; 851 u32 property; 852 int i; 853 struct bq25890_init_data *init = &bq->init_data; 854 struct { 855 char *name; 856 bool optional; 857 enum bq25890_table_ids tbl_id; 858 u8 *conv_data; /* holds converted value from given property */ 859 } props[] = { 860 /* required properties */ 861 {"ti,charge-current", false, TBL_ICHG, &init->ichg}, 862 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg}, 863 {"ti,termination-current", false, TBL_ITERM, &init->iterm}, 864 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg}, 865 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin}, 866 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv}, 867 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti}, 868 869 /* optional properties */ 870 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg}, 871 {"ti,ibatcomp-micro-ohms", true, TBL_RBATCOMP, &init->rbatcomp}, 872 {"ti,ibatcomp-clamp-microvolt", true, TBL_VBATCOMP, &init->vclamp}, 873 }; 874 875 /* initialize data for optional properties */ 876 init->treg = 3; /* 120 degrees Celsius */ 877 init->rbatcomp = init->vclamp = 0; /* IBAT compensation disabled */ 878 879 for (i = 0; i < ARRAY_SIZE(props); i++) { 880 ret = device_property_read_u32(bq->dev, props[i].name, 881 &property); 882 if (ret < 0) { 883 if (props[i].optional) 884 continue; 885 886 dev_err(bq->dev, "Unable to read property %d %s\n", ret, 887 props[i].name); 888 889 return ret; 890 } 891 892 *props[i].conv_data = bq25890_find_idx(property, 893 props[i].tbl_id); 894 } 895 896 return 0; 897 } 898 899 static int bq25890_fw_probe(struct bq25890_device *bq) 900 { 901 int ret; 902 struct bq25890_init_data *init = &bq->init_data; 903 904 ret = bq25890_fw_read_u32_props(bq); 905 if (ret < 0) 906 return ret; 907 908 init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin"); 909 init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq"); 910 911 return 0; 912 } 913 914 static int bq25890_probe(struct i2c_client *client, 915 const struct i2c_device_id *id) 916 { 917 struct device *dev = &client->dev; 918 struct bq25890_device *bq; 919 int ret; 920 int i; 921 922 bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL); 923 if (!bq) 924 return -ENOMEM; 925 926 bq->client = client; 927 bq->dev = dev; 928 929 mutex_init(&bq->lock); 930 931 bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config); 932 if (IS_ERR(bq->rmap)) { 933 dev_err(dev, "failed to allocate register map\n"); 934 return PTR_ERR(bq->rmap); 935 } 936 937 for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) { 938 const struct reg_field *reg_fields = bq25890_reg_fields; 939 940 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap, 941 reg_fields[i]); 942 if (IS_ERR(bq->rmap_fields[i])) { 943 dev_err(dev, "cannot allocate regmap field\n"); 944 return PTR_ERR(bq->rmap_fields[i]); 945 } 946 } 947 948 i2c_set_clientdata(client, bq); 949 950 ret = bq25890_get_chip_version(bq); 951 if (ret) { 952 dev_err(dev, "Cannot read chip ID or unknown chip.\n"); 953 return ret; 954 } 955 956 if (!dev->platform_data) { 957 ret = bq25890_fw_probe(bq); 958 if (ret < 0) { 959 dev_err(dev, "Cannot read device properties.\n"); 960 return ret; 961 } 962 } else { 963 return -ENODEV; 964 } 965 966 ret = bq25890_hw_init(bq); 967 if (ret < 0) { 968 dev_err(dev, "Cannot initialize the chip.\n"); 969 return ret; 970 } 971 972 if (client->irq <= 0) 973 client->irq = bq25890_irq_probe(bq); 974 975 if (client->irq < 0) { 976 dev_err(dev, "No irq resource found.\n"); 977 return client->irq; 978 } 979 980 /* OTG reporting */ 981 bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 982 if (!IS_ERR_OR_NULL(bq->usb_phy)) { 983 INIT_WORK(&bq->usb_work, bq25890_usb_work); 984 bq->usb_nb.notifier_call = bq25890_usb_notifier; 985 usb_register_notifier(bq->usb_phy, &bq->usb_nb); 986 } 987 988 ret = devm_request_threaded_irq(dev, client->irq, NULL, 989 bq25890_irq_handler_thread, 990 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 991 BQ25890_IRQ_PIN, bq); 992 if (ret) 993 goto irq_fail; 994 995 ret = bq25890_power_supply_init(bq); 996 if (ret < 0) { 997 dev_err(dev, "Failed to register power supply\n"); 998 goto irq_fail; 999 } 1000 1001 return 0; 1002 1003 irq_fail: 1004 if (!IS_ERR_OR_NULL(bq->usb_phy)) 1005 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); 1006 1007 return ret; 1008 } 1009 1010 static int bq25890_remove(struct i2c_client *client) 1011 { 1012 struct bq25890_device *bq = i2c_get_clientdata(client); 1013 1014 power_supply_unregister(bq->charger); 1015 1016 if (!IS_ERR_OR_NULL(bq->usb_phy)) 1017 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); 1018 1019 /* reset all registers to default values */ 1020 bq25890_chip_reset(bq); 1021 1022 return 0; 1023 } 1024 1025 #ifdef CONFIG_PM_SLEEP 1026 static int bq25890_suspend(struct device *dev) 1027 { 1028 struct bq25890_device *bq = dev_get_drvdata(dev); 1029 1030 /* 1031 * If charger is removed, while in suspend, make sure ADC is diabled 1032 * since it consumes slightly more power. 1033 */ 1034 return bq25890_field_write(bq, F_CONV_RATE, 0); 1035 } 1036 1037 static int bq25890_resume(struct device *dev) 1038 { 1039 int ret; 1040 struct bq25890_device *bq = dev_get_drvdata(dev); 1041 1042 mutex_lock(&bq->lock); 1043 1044 ret = bq25890_get_chip_state(bq, &bq->state); 1045 if (ret < 0) 1046 goto unlock; 1047 1048 /* Re-enable ADC only if charger is plugged in. */ 1049 if (bq->state.online) { 1050 ret = bq25890_field_write(bq, F_CONV_RATE, 1); 1051 if (ret < 0) 1052 goto unlock; 1053 } 1054 1055 /* signal userspace, maybe state changed while suspended */ 1056 power_supply_changed(bq->charger); 1057 1058 unlock: 1059 mutex_unlock(&bq->lock); 1060 1061 return ret; 1062 } 1063 #endif 1064 1065 static const struct dev_pm_ops bq25890_pm = { 1066 SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume) 1067 }; 1068 1069 static const struct i2c_device_id bq25890_i2c_ids[] = { 1070 { "bq25890", 0 }, 1071 { "bq25892", 0 }, 1072 { "bq25895", 0 }, 1073 { "bq25896", 0 }, 1074 {}, 1075 }; 1076 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids); 1077 1078 static const struct of_device_id bq25890_of_match[] = { 1079 { .compatible = "ti,bq25890", }, 1080 { .compatible = "ti,bq25892", }, 1081 { .compatible = "ti,bq25895", }, 1082 { .compatible = "ti,bq25896", }, 1083 { }, 1084 }; 1085 MODULE_DEVICE_TABLE(of, bq25890_of_match); 1086 1087 #ifdef CONFIG_ACPI 1088 static const struct acpi_device_id bq25890_acpi_match[] = { 1089 {"BQ258900", 0}, 1090 {}, 1091 }; 1092 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match); 1093 #endif 1094 1095 static struct i2c_driver bq25890_driver = { 1096 .driver = { 1097 .name = "bq25890-charger", 1098 .of_match_table = of_match_ptr(bq25890_of_match), 1099 .acpi_match_table = ACPI_PTR(bq25890_acpi_match), 1100 .pm = &bq25890_pm, 1101 }, 1102 .probe = bq25890_probe, 1103 .remove = bq25890_remove, 1104 .id_table = bq25890_i2c_ids, 1105 }; 1106 module_i2c_driver(bq25890_driver); 1107 1108 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); 1109 MODULE_DESCRIPTION("bq25890 charger driver"); 1110 MODULE_LICENSE("GPL"); 1111