1 /* 2 * TI BQ25890 charger driver 3 * 4 * Copyright (C) 2015 Intel Corporation 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 */ 17 18 #include <linux/module.h> 19 #include <linux/i2c.h> 20 #include <linux/power_supply.h> 21 #include <linux/regmap.h> 22 #include <linux/types.h> 23 #include <linux/gpio/consumer.h> 24 #include <linux/interrupt.h> 25 #include <linux/delay.h> 26 #include <linux/usb/phy.h> 27 28 #include <linux/acpi.h> 29 #include <linux/of.h> 30 31 #define BQ25890_MANUFACTURER "Texas Instruments" 32 #define BQ25890_IRQ_PIN "bq25890_irq" 33 34 #define BQ25890_ID 3 35 36 enum bq25890_fields { 37 F_EN_HIZ, F_EN_ILIM, F_IILIM, /* Reg00 */ 38 F_BHOT, F_BCOLD, F_VINDPM_OFS, /* Reg01 */ 39 F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN, 40 F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN, /* Reg02 */ 41 F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN, /* 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_BOOSTI, /* Reg0A */ 51 F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_VSYS_STAT, /* Reg0B */ 52 F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT, 53 F_NTC_FAULT, /* Reg0C */ 54 F_FORCE_VINDPM, F_VINDPM, /* Reg0D */ 55 F_THERM_STAT, F_BATV, /* Reg0E */ 56 F_SYSV, /* Reg0F */ 57 F_TSPCT, /* Reg10 */ 58 F_VBUS_GD, F_VBUSV, /* Reg11 */ 59 F_ICHGR, /* Reg12 */ 60 F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM, /* Reg13 */ 61 F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV, /* Reg14 */ 62 63 F_MAX_FIELDS 64 }; 65 66 /* initial field values, converted to register values */ 67 struct bq25890_init_data { 68 u8 ichg; /* charge current */ 69 u8 vreg; /* regulation voltage */ 70 u8 iterm; /* termination current */ 71 u8 iprechg; /* precharge current */ 72 u8 sysvmin; /* minimum system voltage limit */ 73 u8 boostv; /* boost regulation voltage */ 74 u8 boosti; /* boost current limit */ 75 u8 boostf; /* boost frequency */ 76 u8 ilim_en; /* enable ILIM pin */ 77 u8 treg; /* thermal regulation threshold */ 78 }; 79 80 struct bq25890_state { 81 u8 online; 82 u8 chrg_status; 83 u8 chrg_fault; 84 u8 vsys_status; 85 u8 boost_fault; 86 u8 bat_fault; 87 }; 88 89 struct bq25890_device { 90 struct i2c_client *client; 91 struct device *dev; 92 struct power_supply *charger; 93 94 struct usb_phy *usb_phy; 95 struct notifier_block usb_nb; 96 struct work_struct usb_work; 97 unsigned long usb_event; 98 99 struct regmap *rmap; 100 struct regmap_field *rmap_fields[F_MAX_FIELDS]; 101 102 int chip_id; 103 struct bq25890_init_data init_data; 104 struct bq25890_state state; 105 106 struct mutex lock; /* protect state data */ 107 }; 108 109 static const struct regmap_range bq25890_readonly_reg_ranges[] = { 110 regmap_reg_range(0x0b, 0x0c), 111 regmap_reg_range(0x0e, 0x13), 112 }; 113 114 static const struct regmap_access_table bq25890_writeable_regs = { 115 .no_ranges = bq25890_readonly_reg_ranges, 116 .n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges), 117 }; 118 119 static const struct regmap_range bq25890_volatile_reg_ranges[] = { 120 regmap_reg_range(0x00, 0x00), 121 regmap_reg_range(0x09, 0x09), 122 regmap_reg_range(0x0b, 0x0c), 123 regmap_reg_range(0x0e, 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), 157 [F_MAXC_EN] = REG_FIELD(0x02, 2, 2), 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 /* REG04 */ 167 [F_PUMPX_EN] = REG_FIELD(0x04, 7, 7), 168 [F_ICHG] = REG_FIELD(0x04, 0, 6), 169 /* REG05 */ 170 [F_IPRECHG] = REG_FIELD(0x05, 4, 7), 171 [F_ITERM] = REG_FIELD(0x05, 0, 3), 172 /* REG06 */ 173 [F_VREG] = REG_FIELD(0x06, 2, 7), 174 [F_BATLOWV] = REG_FIELD(0x06, 1, 1), 175 [F_VRECHG] = REG_FIELD(0x06, 0, 0), 176 /* REG07 */ 177 [F_TERM_EN] = REG_FIELD(0x07, 7, 7), 178 [F_STAT_DIS] = REG_FIELD(0x07, 6, 6), 179 [F_WD] = REG_FIELD(0x07, 4, 5), 180 [F_TMR_EN] = REG_FIELD(0x07, 3, 3), 181 [F_CHG_TMR] = REG_FIELD(0x07, 1, 2), 182 [F_JEITA_ISET] = REG_FIELD(0x07, 0, 0), 183 /* REG08 */ 184 [F_BATCMP] = REG_FIELD(0x08, 6, 7), 185 [F_VCLAMP] = REG_FIELD(0x08, 2, 4), 186 [F_TREG] = REG_FIELD(0x08, 0, 1), 187 /* REG09 */ 188 [F_FORCE_ICO] = REG_FIELD(0x09, 7, 7), 189 [F_TMR2X_EN] = REG_FIELD(0x09, 6, 6), 190 [F_BATFET_DIS] = REG_FIELD(0x09, 5, 5), 191 [F_JEITA_VSET] = REG_FIELD(0x09, 4, 4), 192 [F_BATFET_DLY] = REG_FIELD(0x09, 3, 3), 193 [F_BATFET_RST_EN] = REG_FIELD(0x09, 2, 2), 194 [F_PUMPX_UP] = REG_FIELD(0x09, 1, 1), 195 [F_PUMPX_DN] = REG_FIELD(0x09, 0, 0), 196 /* REG0A */ 197 [F_BOOSTV] = REG_FIELD(0x0A, 4, 7), 198 [F_BOOSTI] = REG_FIELD(0x0A, 0, 2), 199 /* REG0B */ 200 [F_VBUS_STAT] = REG_FIELD(0x0B, 5, 7), 201 [F_CHG_STAT] = REG_FIELD(0x0B, 3, 4), 202 [F_PG_STAT] = REG_FIELD(0x0B, 2, 2), 203 [F_SDP_STAT] = REG_FIELD(0x0B, 1, 1), 204 [F_VSYS_STAT] = REG_FIELD(0x0B, 0, 0), 205 /* REG0C */ 206 [F_WD_FAULT] = REG_FIELD(0x0C, 7, 7), 207 [F_BOOST_FAULT] = REG_FIELD(0x0C, 6, 6), 208 [F_CHG_FAULT] = REG_FIELD(0x0C, 4, 5), 209 [F_BAT_FAULT] = REG_FIELD(0x0C, 3, 3), 210 [F_NTC_FAULT] = REG_FIELD(0x0C, 0, 2), 211 /* REG0D */ 212 [F_FORCE_VINDPM] = REG_FIELD(0x0D, 7, 7), 213 [F_VINDPM] = REG_FIELD(0x0D, 0, 6), 214 /* REG0E */ 215 [F_THERM_STAT] = REG_FIELD(0x0E, 7, 7), 216 [F_BATV] = REG_FIELD(0x0E, 0, 6), 217 /* REG0F */ 218 [F_SYSV] = REG_FIELD(0x0F, 0, 6), 219 /* REG10 */ 220 [F_TSPCT] = REG_FIELD(0x10, 0, 6), 221 /* REG11 */ 222 [F_VBUS_GD] = REG_FIELD(0x11, 7, 7), 223 [F_VBUSV] = REG_FIELD(0x11, 0, 6), 224 /* REG12 */ 225 [F_ICHGR] = REG_FIELD(0x12, 0, 6), 226 /* REG13 */ 227 [F_VDPM_STAT] = REG_FIELD(0x13, 7, 7), 228 [F_IDPM_STAT] = REG_FIELD(0x13, 6, 6), 229 [F_IDPM_LIM] = REG_FIELD(0x13, 0, 5), 230 /* REG14 */ 231 [F_REG_RST] = REG_FIELD(0x14, 7, 7), 232 [F_ICO_OPTIMIZED] = REG_FIELD(0x14, 6, 6), 233 [F_PN] = REG_FIELD(0x14, 3, 5), 234 [F_TS_PROFILE] = REG_FIELD(0x14, 2, 2), 235 [F_DEV_REV] = REG_FIELD(0x14, 0, 1) 236 }; 237 238 /* 239 * Most of the val -> idx conversions can be computed, given the minimum, 240 * maximum and the step between values. For the rest of conversions, we use 241 * lookup tables. 242 */ 243 enum bq25890_table_ids { 244 /* range tables */ 245 TBL_ICHG, 246 TBL_ITERM, 247 TBL_IPRECHG, 248 TBL_VREG, 249 TBL_BATCMP, 250 TBL_VCLAMP, 251 TBL_BOOSTV, 252 TBL_SYSVMIN, 253 254 /* lookup tables */ 255 TBL_TREG, 256 TBL_BOOSTI, 257 }; 258 259 /* Thermal Regulation Threshold lookup table, in degrees Celsius */ 260 static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 }; 261 262 #define BQ25890_TREG_TBL_SIZE ARRAY_SIZE(bq25890_treg_tbl) 263 264 /* Boost mode current limit lookup table, in uA */ 265 static const u32 bq25890_boosti_tbl[] = { 266 500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000 267 }; 268 269 #define BQ25890_BOOSTI_TBL_SIZE ARRAY_SIZE(bq25890_boosti_tbl) 270 271 struct bq25890_range { 272 u32 min; 273 u32 max; 274 u32 step; 275 }; 276 277 struct bq25890_lookup { 278 const u32 *tbl; 279 u32 size; 280 }; 281 282 static const union { 283 struct bq25890_range rt; 284 struct bq25890_lookup lt; 285 } bq25890_tables[] = { 286 /* range tables */ 287 [TBL_ICHG] = { .rt = {0, 5056000, 64000} }, /* uA */ 288 [TBL_ITERM] = { .rt = {64000, 1024000, 64000} }, /* uA */ 289 [TBL_VREG] = { .rt = {3840000, 4608000, 16000} }, /* uV */ 290 [TBL_BATCMP] = { .rt = {0, 140, 20} }, /* mOhm */ 291 [TBL_VCLAMP] = { .rt = {0, 224000, 32000} }, /* uV */ 292 [TBL_BOOSTV] = { .rt = {4550000, 5510000, 64000} }, /* uV */ 293 [TBL_SYSVMIN] = { .rt = {3000000, 3700000, 100000} }, /* uV */ 294 295 /* lookup tables */ 296 [TBL_TREG] = { .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} }, 297 [TBL_BOOSTI] = { .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} } 298 }; 299 300 static int bq25890_field_read(struct bq25890_device *bq, 301 enum bq25890_fields field_id) 302 { 303 int ret; 304 int val; 305 306 ret = regmap_field_read(bq->rmap_fields[field_id], &val); 307 if (ret < 0) 308 return ret; 309 310 return val; 311 } 312 313 static int bq25890_field_write(struct bq25890_device *bq, 314 enum bq25890_fields field_id, u8 val) 315 { 316 return regmap_field_write(bq->rmap_fields[field_id], val); 317 } 318 319 static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id) 320 { 321 u8 idx; 322 323 if (id >= TBL_TREG) { 324 const u32 *tbl = bq25890_tables[id].lt.tbl; 325 u32 tbl_size = bq25890_tables[id].lt.size; 326 327 for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++) 328 ; 329 } else { 330 const struct bq25890_range *rtbl = &bq25890_tables[id].rt; 331 u8 rtbl_size; 332 333 rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1; 334 335 for (idx = 1; 336 idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value); 337 idx++) 338 ; 339 } 340 341 return idx - 1; 342 } 343 344 static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id) 345 { 346 const struct bq25890_range *rtbl; 347 348 /* lookup table? */ 349 if (id >= TBL_TREG) 350 return bq25890_tables[id].lt.tbl[idx]; 351 352 /* range table */ 353 rtbl = &bq25890_tables[id].rt; 354 355 return (rtbl->min + idx * rtbl->step); 356 } 357 358 enum bq25890_status { 359 STATUS_NOT_CHARGING, 360 STATUS_PRE_CHARGING, 361 STATUS_FAST_CHARGING, 362 STATUS_TERMINATION_DONE, 363 }; 364 365 enum bq25890_chrg_fault { 366 CHRG_FAULT_NORMAL, 367 CHRG_FAULT_INPUT, 368 CHRG_FAULT_THERMAL_SHUTDOWN, 369 CHRG_FAULT_TIMER_EXPIRED, 370 }; 371 372 static int bq25890_power_supply_get_property(struct power_supply *psy, 373 enum power_supply_property psp, 374 union power_supply_propval *val) 375 { 376 int ret; 377 struct bq25890_device *bq = power_supply_get_drvdata(psy); 378 struct bq25890_state state; 379 380 mutex_lock(&bq->lock); 381 state = bq->state; 382 mutex_unlock(&bq->lock); 383 384 switch (psp) { 385 case POWER_SUPPLY_PROP_STATUS: 386 if (!state.online) 387 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 388 else if (state.chrg_status == STATUS_NOT_CHARGING) 389 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 390 else if (state.chrg_status == STATUS_PRE_CHARGING || 391 state.chrg_status == STATUS_FAST_CHARGING) 392 val->intval = POWER_SUPPLY_STATUS_CHARGING; 393 else if (state.chrg_status == STATUS_TERMINATION_DONE) 394 val->intval = POWER_SUPPLY_STATUS_FULL; 395 else 396 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 397 398 break; 399 400 case POWER_SUPPLY_PROP_MANUFACTURER: 401 val->strval = BQ25890_MANUFACTURER; 402 break; 403 404 case POWER_SUPPLY_PROP_ONLINE: 405 val->intval = state.online; 406 break; 407 408 case POWER_SUPPLY_PROP_HEALTH: 409 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault) 410 val->intval = POWER_SUPPLY_HEALTH_GOOD; 411 else if (state.bat_fault) 412 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 413 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED) 414 val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; 415 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN) 416 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 417 else 418 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 419 break; 420 421 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 422 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */ 423 if (ret < 0) 424 return ret; 425 426 /* converted_val = ADC_val * 50mA (table 10.3.19) */ 427 val->intval = ret * 50000; 428 break; 429 430 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 431 val->intval = bq25890_tables[TBL_ICHG].rt.max; 432 break; 433 434 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 435 if (!state.online) { 436 val->intval = 0; 437 break; 438 } 439 440 ret = bq25890_field_read(bq, F_BATV); /* read measured value */ 441 if (ret < 0) 442 return ret; 443 444 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ 445 val->intval = 2304000 + ret * 20000; 446 break; 447 448 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: 449 val->intval = bq25890_tables[TBL_VREG].rt.max; 450 break; 451 452 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: 453 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM); 454 break; 455 456 default: 457 return -EINVAL; 458 } 459 460 return 0; 461 } 462 463 static int bq25890_get_chip_state(struct bq25890_device *bq, 464 struct bq25890_state *state) 465 { 466 int i, ret; 467 468 struct { 469 enum bq25890_fields id; 470 u8 *data; 471 } state_fields[] = { 472 {F_CHG_STAT, &state->chrg_status}, 473 {F_PG_STAT, &state->online}, 474 {F_VSYS_STAT, &state->vsys_status}, 475 {F_BOOST_FAULT, &state->boost_fault}, 476 {F_BAT_FAULT, &state->bat_fault}, 477 {F_CHG_FAULT, &state->chrg_fault} 478 }; 479 480 for (i = 0; i < ARRAY_SIZE(state_fields); i++) { 481 ret = bq25890_field_read(bq, state_fields[i].id); 482 if (ret < 0) 483 return ret; 484 485 *state_fields[i].data = ret; 486 } 487 488 dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n", 489 state->chrg_status, state->online, state->vsys_status, 490 state->chrg_fault, state->boost_fault, state->bat_fault); 491 492 return 0; 493 } 494 495 static bool bq25890_state_changed(struct bq25890_device *bq, 496 struct bq25890_state *new_state) 497 { 498 struct bq25890_state old_state; 499 500 mutex_lock(&bq->lock); 501 old_state = bq->state; 502 mutex_unlock(&bq->lock); 503 504 return (old_state.chrg_status != new_state->chrg_status || 505 old_state.chrg_fault != new_state->chrg_fault || 506 old_state.online != new_state->online || 507 old_state.bat_fault != new_state->bat_fault || 508 old_state.boost_fault != new_state->boost_fault || 509 old_state.vsys_status != new_state->vsys_status); 510 } 511 512 static void bq25890_handle_state_change(struct bq25890_device *bq, 513 struct bq25890_state *new_state) 514 { 515 int ret; 516 struct bq25890_state old_state; 517 518 mutex_lock(&bq->lock); 519 old_state = bq->state; 520 mutex_unlock(&bq->lock); 521 522 if (!new_state->online) { /* power removed */ 523 /* disable ADC */ 524 ret = bq25890_field_write(bq, F_CONV_START, 0); 525 if (ret < 0) 526 goto error; 527 } else if (!old_state.online) { /* power inserted */ 528 /* enable ADC, to have control of charge current/voltage */ 529 ret = bq25890_field_write(bq, F_CONV_START, 1); 530 if (ret < 0) 531 goto error; 532 } 533 534 return; 535 536 error: 537 dev_err(bq->dev, "Error communicating with the chip.\n"); 538 } 539 540 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private) 541 { 542 struct bq25890_device *bq = private; 543 int ret; 544 struct bq25890_state state; 545 546 ret = bq25890_get_chip_state(bq, &state); 547 if (ret < 0) 548 goto handled; 549 550 if (!bq25890_state_changed(bq, &state)) 551 goto handled; 552 553 bq25890_handle_state_change(bq, &state); 554 555 mutex_lock(&bq->lock); 556 bq->state = state; 557 mutex_unlock(&bq->lock); 558 559 power_supply_changed(bq->charger); 560 561 handled: 562 return IRQ_HANDLED; 563 } 564 565 static int bq25890_chip_reset(struct bq25890_device *bq) 566 { 567 int ret; 568 int rst_check_counter = 10; 569 570 ret = bq25890_field_write(bq, F_REG_RST, 1); 571 if (ret < 0) 572 return ret; 573 574 do { 575 ret = bq25890_field_read(bq, F_REG_RST); 576 if (ret < 0) 577 return ret; 578 579 usleep_range(5, 10); 580 } while (ret == 1 && --rst_check_counter); 581 582 if (!rst_check_counter) 583 return -ETIMEDOUT; 584 585 return 0; 586 } 587 588 static int bq25890_hw_init(struct bq25890_device *bq) 589 { 590 int ret; 591 int i; 592 struct bq25890_state state; 593 594 const struct { 595 enum bq25890_fields id; 596 u32 value; 597 } init_data[] = { 598 {F_ICHG, bq->init_data.ichg}, 599 {F_VREG, bq->init_data.vreg}, 600 {F_ITERM, bq->init_data.iterm}, 601 {F_IPRECHG, bq->init_data.iprechg}, 602 {F_SYSVMIN, bq->init_data.sysvmin}, 603 {F_BOOSTV, bq->init_data.boostv}, 604 {F_BOOSTI, bq->init_data.boosti}, 605 {F_BOOSTF, bq->init_data.boostf}, 606 {F_EN_ILIM, bq->init_data.ilim_en}, 607 {F_TREG, bq->init_data.treg} 608 }; 609 610 ret = bq25890_chip_reset(bq); 611 if (ret < 0) 612 return ret; 613 614 /* disable watchdog */ 615 ret = bq25890_field_write(bq, F_WD, 0); 616 if (ret < 0) 617 return ret; 618 619 /* initialize currents/voltages and other parameters */ 620 for (i = 0; i < ARRAY_SIZE(init_data); i++) { 621 ret = bq25890_field_write(bq, init_data[i].id, 622 init_data[i].value); 623 if (ret < 0) 624 return ret; 625 } 626 627 /* Configure ADC for continuous conversions. This does not enable it. */ 628 ret = bq25890_field_write(bq, F_CONV_RATE, 1); 629 if (ret < 0) 630 return ret; 631 632 ret = bq25890_get_chip_state(bq, &state); 633 if (ret < 0) 634 return ret; 635 636 mutex_lock(&bq->lock); 637 bq->state = state; 638 mutex_unlock(&bq->lock); 639 640 return 0; 641 } 642 643 static enum power_supply_property bq25890_power_supply_props[] = { 644 POWER_SUPPLY_PROP_MANUFACTURER, 645 POWER_SUPPLY_PROP_STATUS, 646 POWER_SUPPLY_PROP_ONLINE, 647 POWER_SUPPLY_PROP_HEALTH, 648 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, 649 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 650 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, 651 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 652 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, 653 }; 654 655 static char *bq25890_charger_supplied_to[] = { 656 "main-battery", 657 }; 658 659 static const struct power_supply_desc bq25890_power_supply_desc = { 660 .name = "bq25890-charger", 661 .type = POWER_SUPPLY_TYPE_USB, 662 .properties = bq25890_power_supply_props, 663 .num_properties = ARRAY_SIZE(bq25890_power_supply_props), 664 .get_property = bq25890_power_supply_get_property, 665 }; 666 667 static int bq25890_power_supply_init(struct bq25890_device *bq) 668 { 669 struct power_supply_config psy_cfg = { .drv_data = bq, }; 670 671 psy_cfg.supplied_to = bq25890_charger_supplied_to; 672 psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to); 673 674 bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc, 675 &psy_cfg); 676 677 return PTR_ERR_OR_ZERO(bq->charger); 678 } 679 680 static void bq25890_usb_work(struct work_struct *data) 681 { 682 int ret; 683 struct bq25890_device *bq = 684 container_of(data, struct bq25890_device, usb_work); 685 686 switch (bq->usb_event) { 687 case USB_EVENT_ID: 688 /* Enable boost mode */ 689 ret = bq25890_field_write(bq, F_OTG_CFG, 1); 690 if (ret < 0) 691 goto error; 692 break; 693 694 case USB_EVENT_NONE: 695 /* Disable boost mode */ 696 ret = bq25890_field_write(bq, F_OTG_CFG, 0); 697 if (ret < 0) 698 goto error; 699 700 power_supply_changed(bq->charger); 701 break; 702 } 703 704 return; 705 706 error: 707 dev_err(bq->dev, "Error switching to boost/charger mode.\n"); 708 } 709 710 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val, 711 void *priv) 712 { 713 struct bq25890_device *bq = 714 container_of(nb, struct bq25890_device, usb_nb); 715 716 bq->usb_event = val; 717 queue_work(system_power_efficient_wq, &bq->usb_work); 718 719 return NOTIFY_OK; 720 } 721 722 static int bq25890_irq_probe(struct bq25890_device *bq) 723 { 724 struct gpio_desc *irq; 725 726 irq = devm_gpiod_get_index(bq->dev, BQ25890_IRQ_PIN, 0, GPIOD_IN); 727 if (IS_ERR(irq)) { 728 dev_err(bq->dev, "Could not probe irq pin.\n"); 729 return PTR_ERR(irq); 730 } 731 732 return gpiod_to_irq(irq); 733 } 734 735 static int bq25890_fw_read_u32_props(struct bq25890_device *bq) 736 { 737 int ret; 738 u32 property; 739 int i; 740 struct bq25890_init_data *init = &bq->init_data; 741 struct { 742 char *name; 743 bool optional; 744 enum bq25890_table_ids tbl_id; 745 u8 *conv_data; /* holds converted value from given property */ 746 } props[] = { 747 /* required properties */ 748 {"ti,charge-current", false, TBL_ICHG, &init->ichg}, 749 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg}, 750 {"ti,termination-current", false, TBL_ITERM, &init->iterm}, 751 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg}, 752 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin}, 753 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv}, 754 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti}, 755 756 /* optional properties */ 757 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg} 758 }; 759 760 /* initialize data for optional properties */ 761 init->treg = 3; /* 120 degrees Celsius */ 762 763 for (i = 0; i < ARRAY_SIZE(props); i++) { 764 ret = device_property_read_u32(bq->dev, props[i].name, 765 &property); 766 if (ret < 0) { 767 if (props[i].optional) 768 continue; 769 770 return ret; 771 } 772 773 *props[i].conv_data = bq25890_find_idx(property, 774 props[i].tbl_id); 775 } 776 777 return 0; 778 } 779 780 static int bq25890_fw_probe(struct bq25890_device *bq) 781 { 782 int ret; 783 struct bq25890_init_data *init = &bq->init_data; 784 785 ret = bq25890_fw_read_u32_props(bq); 786 if (ret < 0) 787 return ret; 788 789 init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin"); 790 init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq"); 791 792 return 0; 793 } 794 795 static int bq25890_probe(struct i2c_client *client, 796 const struct i2c_device_id *id) 797 { 798 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); 799 struct device *dev = &client->dev; 800 struct bq25890_device *bq; 801 int ret; 802 int i; 803 804 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 805 dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); 806 return -ENODEV; 807 } 808 809 bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL); 810 if (!bq) 811 return -ENOMEM; 812 813 bq->client = client; 814 bq->dev = dev; 815 816 mutex_init(&bq->lock); 817 818 bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config); 819 if (IS_ERR(bq->rmap)) { 820 dev_err(dev, "failed to allocate register map\n"); 821 return PTR_ERR(bq->rmap); 822 } 823 824 for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) { 825 const struct reg_field *reg_fields = bq25890_reg_fields; 826 827 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap, 828 reg_fields[i]); 829 if (IS_ERR(bq->rmap_fields[i])) { 830 dev_err(dev, "cannot allocate regmap field\n"); 831 return PTR_ERR(bq->rmap_fields[i]); 832 } 833 } 834 835 i2c_set_clientdata(client, bq); 836 837 bq->chip_id = bq25890_field_read(bq, F_PN); 838 if (bq->chip_id < 0) { 839 dev_err(dev, "Cannot read chip ID.\n"); 840 return bq->chip_id; 841 } 842 843 if (bq->chip_id != BQ25890_ID) { 844 dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id); 845 return -ENODEV; 846 } 847 848 if (!dev->platform_data) { 849 ret = bq25890_fw_probe(bq); 850 if (ret < 0) { 851 dev_err(dev, "Cannot read device properties.\n"); 852 return ret; 853 } 854 } else { 855 return -ENODEV; 856 } 857 858 ret = bq25890_hw_init(bq); 859 if (ret < 0) { 860 dev_err(dev, "Cannot initialize the chip.\n"); 861 return ret; 862 } 863 864 if (client->irq <= 0) 865 client->irq = bq25890_irq_probe(bq); 866 867 if (client->irq < 0) { 868 dev_err(dev, "No irq resource found.\n"); 869 return client->irq; 870 } 871 872 /* OTG reporting */ 873 bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 874 if (!IS_ERR_OR_NULL(bq->usb_phy)) { 875 INIT_WORK(&bq->usb_work, bq25890_usb_work); 876 bq->usb_nb.notifier_call = bq25890_usb_notifier; 877 usb_register_notifier(bq->usb_phy, &bq->usb_nb); 878 } 879 880 ret = devm_request_threaded_irq(dev, client->irq, NULL, 881 bq25890_irq_handler_thread, 882 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 883 BQ25890_IRQ_PIN, bq); 884 if (ret) 885 goto irq_fail; 886 887 ret = bq25890_power_supply_init(bq); 888 if (ret < 0) { 889 dev_err(dev, "Failed to register power supply\n"); 890 goto irq_fail; 891 } 892 893 return 0; 894 895 irq_fail: 896 if (!IS_ERR_OR_NULL(bq->usb_phy)) 897 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); 898 899 return ret; 900 } 901 902 static int bq25890_remove(struct i2c_client *client) 903 { 904 struct bq25890_device *bq = i2c_get_clientdata(client); 905 906 power_supply_unregister(bq->charger); 907 908 if (!IS_ERR_OR_NULL(bq->usb_phy)) 909 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); 910 911 /* reset all registers to default values */ 912 bq25890_chip_reset(bq); 913 914 return 0; 915 } 916 917 #ifdef CONFIG_PM_SLEEP 918 static int bq25890_suspend(struct device *dev) 919 { 920 struct bq25890_device *bq = dev_get_drvdata(dev); 921 922 /* 923 * If charger is removed, while in suspend, make sure ADC is diabled 924 * since it consumes slightly more power. 925 */ 926 return bq25890_field_write(bq, F_CONV_START, 0); 927 } 928 929 static int bq25890_resume(struct device *dev) 930 { 931 int ret; 932 struct bq25890_state state; 933 struct bq25890_device *bq = dev_get_drvdata(dev); 934 935 ret = bq25890_get_chip_state(bq, &state); 936 if (ret < 0) 937 return ret; 938 939 mutex_lock(&bq->lock); 940 bq->state = state; 941 mutex_unlock(&bq->lock); 942 943 /* Re-enable ADC only if charger is plugged in. */ 944 if (state.online) { 945 ret = bq25890_field_write(bq, F_CONV_START, 1); 946 if (ret < 0) 947 return ret; 948 } 949 950 /* signal userspace, maybe state changed while suspended */ 951 power_supply_changed(bq->charger); 952 953 return 0; 954 } 955 #endif 956 957 static const struct dev_pm_ops bq25890_pm = { 958 SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume) 959 }; 960 961 static const struct i2c_device_id bq25890_i2c_ids[] = { 962 { "bq25890", 0 }, 963 {}, 964 }; 965 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids); 966 967 static const struct of_device_id bq25890_of_match[] = { 968 { .compatible = "ti,bq25890", }, 969 { }, 970 }; 971 MODULE_DEVICE_TABLE(of, bq25890_of_match); 972 973 static const struct acpi_device_id bq25890_acpi_match[] = { 974 {"BQ258900", 0}, 975 {}, 976 }; 977 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match); 978 979 static struct i2c_driver bq25890_driver = { 980 .driver = { 981 .name = "bq25890-charger", 982 .of_match_table = of_match_ptr(bq25890_of_match), 983 .acpi_match_table = ACPI_PTR(bq25890_acpi_match), 984 .pm = &bq25890_pm, 985 }, 986 .probe = bq25890_probe, 987 .remove = bq25890_remove, 988 .id_table = bq25890_i2c_ids, 989 }; 990 module_i2c_driver(bq25890_driver); 991 992 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); 993 MODULE_DESCRIPTION("bq25890 charger driver"); 994 MODULE_LICENSE("GPL"); 995