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 #define BQ25896_ID 0 36 37 enum bq25890_fields { 38 F_EN_HIZ, F_EN_ILIM, F_IILIM, /* Reg00 */ 39 F_BHOT, F_BCOLD, F_VINDPM_OFS, /* Reg01 */ 40 F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN, 41 F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN, /* Reg02 */ 42 F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN, /* Reg03 */ 43 F_PUMPX_EN, F_ICHG, /* Reg04 */ 44 F_IPRECHG, F_ITERM, /* Reg05 */ 45 F_VREG, F_BATLOWV, F_VRECHG, /* Reg06 */ 46 F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR, 47 F_JEITA_ISET, /* Reg07 */ 48 F_BATCMP, F_VCLAMP, F_TREG, /* Reg08 */ 49 F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET, 50 F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN, /* Reg09 */ 51 F_BOOSTV, F_BOOSTI, /* Reg0A */ 52 F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, 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 int chip_id; 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, 0x0c), 124 regmap_reg_range(0x0e, 0x14), 125 }; 126 127 static const struct regmap_access_table bq25890_volatile_regs = { 128 .yes_ranges = bq25890_volatile_reg_ranges, 129 .n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges), 130 }; 131 132 static const struct regmap_config bq25890_regmap_config = { 133 .reg_bits = 8, 134 .val_bits = 8, 135 136 .max_register = 0x14, 137 .cache_type = REGCACHE_RBTREE, 138 139 .wr_table = &bq25890_writeable_regs, 140 .volatile_table = &bq25890_volatile_regs, 141 }; 142 143 static const struct reg_field bq25890_reg_fields[] = { 144 /* REG00 */ 145 [F_EN_HIZ] = REG_FIELD(0x00, 7, 7), 146 [F_EN_ILIM] = REG_FIELD(0x00, 6, 6), 147 [F_IILIM] = REG_FIELD(0x00, 0, 5), 148 /* REG01 */ 149 [F_BHOT] = REG_FIELD(0x01, 6, 7), 150 [F_BCOLD] = REG_FIELD(0x01, 5, 5), 151 [F_VINDPM_OFS] = REG_FIELD(0x01, 0, 4), 152 /* REG02 */ 153 [F_CONV_START] = REG_FIELD(0x02, 7, 7), 154 [F_CONV_RATE] = REG_FIELD(0x02, 6, 6), 155 [F_BOOSTF] = REG_FIELD(0x02, 5, 5), 156 [F_ICO_EN] = REG_FIELD(0x02, 4, 4), 157 [F_HVDCP_EN] = REG_FIELD(0x02, 3, 3), // reserved on BQ25896 158 [F_MAXC_EN] = REG_FIELD(0x02, 2, 2), // reserved on BQ25896 159 [F_FORCE_DPM] = REG_FIELD(0x02, 1, 1), 160 [F_AUTO_DPDM_EN] = REG_FIELD(0x02, 0, 0), 161 /* REG03 */ 162 [F_BAT_LOAD_EN] = REG_FIELD(0x03, 7, 7), 163 [F_WD_RST] = REG_FIELD(0x03, 6, 6), 164 [F_OTG_CFG] = REG_FIELD(0x03, 5, 5), 165 [F_CHG_CFG] = REG_FIELD(0x03, 4, 4), 166 [F_SYSVMIN] = REG_FIELD(0x03, 1, 3), 167 /* MIN_VBAT_SEL on BQ25896 */ 168 /* REG04 */ 169 [F_PUMPX_EN] = REG_FIELD(0x04, 7, 7), 170 [F_ICHG] = REG_FIELD(0x04, 0, 6), 171 /* REG05 */ 172 [F_IPRECHG] = REG_FIELD(0x05, 4, 7), 173 [F_ITERM] = REG_FIELD(0x05, 0, 3), 174 /* REG06 */ 175 [F_VREG] = REG_FIELD(0x06, 2, 7), 176 [F_BATLOWV] = REG_FIELD(0x06, 1, 1), 177 [F_VRECHG] = REG_FIELD(0x06, 0, 0), 178 /* REG07 */ 179 [F_TERM_EN] = REG_FIELD(0x07, 7, 7), 180 [F_STAT_DIS] = REG_FIELD(0x07, 6, 6), 181 [F_WD] = REG_FIELD(0x07, 4, 5), 182 [F_TMR_EN] = REG_FIELD(0x07, 3, 3), 183 [F_CHG_TMR] = REG_FIELD(0x07, 1, 2), 184 [F_JEITA_ISET] = REG_FIELD(0x07, 0, 0), 185 /* REG08 */ 186 [F_BATCMP] = REG_FIELD(0x08, 6, 7), // 5-7 on BQ25896 187 [F_VCLAMP] = REG_FIELD(0x08, 2, 4), 188 [F_TREG] = REG_FIELD(0x08, 0, 1), 189 /* REG09 */ 190 [F_FORCE_ICO] = REG_FIELD(0x09, 7, 7), 191 [F_TMR2X_EN] = REG_FIELD(0x09, 6, 6), 192 [F_BATFET_DIS] = REG_FIELD(0x09, 5, 5), 193 [F_JEITA_VSET] = REG_FIELD(0x09, 4, 4), 194 [F_BATFET_DLY] = REG_FIELD(0x09, 3, 3), 195 [F_BATFET_RST_EN] = REG_FIELD(0x09, 2, 2), 196 [F_PUMPX_UP] = REG_FIELD(0x09, 1, 1), 197 [F_PUMPX_DN] = REG_FIELD(0x09, 0, 0), 198 /* REG0A */ 199 [F_BOOSTV] = REG_FIELD(0x0A, 4, 7), 200 /* PFM_OTG_DIS 3 on BQ25896 */ 201 [F_BOOSTI] = REG_FIELD(0x0A, 0, 2), 202 /* REG0B */ 203 [F_VBUS_STAT] = REG_FIELD(0x0B, 5, 7), 204 [F_CHG_STAT] = REG_FIELD(0x0B, 3, 4), 205 [F_PG_STAT] = REG_FIELD(0x0B, 2, 2), 206 [F_SDP_STAT] = REG_FIELD(0x0B, 1, 1), // reserved on BQ25896 207 [F_VSYS_STAT] = REG_FIELD(0x0B, 0, 0), 208 /* REG0C */ 209 [F_WD_FAULT] = REG_FIELD(0x0C, 7, 7), 210 [F_BOOST_FAULT] = REG_FIELD(0x0C, 6, 6), 211 [F_CHG_FAULT] = REG_FIELD(0x0C, 4, 5), 212 [F_BAT_FAULT] = REG_FIELD(0x0C, 3, 3), 213 [F_NTC_FAULT] = REG_FIELD(0x0C, 0, 2), 214 /* REG0D */ 215 [F_FORCE_VINDPM] = REG_FIELD(0x0D, 7, 7), 216 [F_VINDPM] = REG_FIELD(0x0D, 0, 6), 217 /* REG0E */ 218 [F_THERM_STAT] = REG_FIELD(0x0E, 7, 7), 219 [F_BATV] = REG_FIELD(0x0E, 0, 6), 220 /* REG0F */ 221 [F_SYSV] = REG_FIELD(0x0F, 0, 6), 222 /* REG10 */ 223 [F_TSPCT] = REG_FIELD(0x10, 0, 6), 224 /* REG11 */ 225 [F_VBUS_GD] = REG_FIELD(0x11, 7, 7), 226 [F_VBUSV] = REG_FIELD(0x11, 0, 6), 227 /* REG12 */ 228 [F_ICHGR] = REG_FIELD(0x12, 0, 6), 229 /* REG13 */ 230 [F_VDPM_STAT] = REG_FIELD(0x13, 7, 7), 231 [F_IDPM_STAT] = REG_FIELD(0x13, 6, 6), 232 [F_IDPM_LIM] = REG_FIELD(0x13, 0, 5), 233 /* REG14 */ 234 [F_REG_RST] = REG_FIELD(0x14, 7, 7), 235 [F_ICO_OPTIMIZED] = REG_FIELD(0x14, 6, 6), 236 [F_PN] = REG_FIELD(0x14, 3, 5), 237 [F_TS_PROFILE] = REG_FIELD(0x14, 2, 2), 238 [F_DEV_REV] = REG_FIELD(0x14, 0, 1) 239 }; 240 241 /* 242 * Most of the val -> idx conversions can be computed, given the minimum, 243 * maximum and the step between values. For the rest of conversions, we use 244 * lookup tables. 245 */ 246 enum bq25890_table_ids { 247 /* range tables */ 248 TBL_ICHG, 249 TBL_ITERM, 250 TBL_VREG, 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_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_id == BQ25890_ID) 404 val->strval = "BQ25890"; 405 else if (bq->chip_id == BQ25896_ID) 406 val->strval = "BQ25896"; 407 else 408 val->strval = "UNKNOWN"; 409 410 break; 411 412 case POWER_SUPPLY_PROP_ONLINE: 413 val->intval = state.online; 414 break; 415 416 case POWER_SUPPLY_PROP_HEALTH: 417 if (!state.chrg_fault && !state.bat_fault && !state.boost_fault) 418 val->intval = POWER_SUPPLY_HEALTH_GOOD; 419 else if (state.bat_fault) 420 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 421 else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED) 422 val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; 423 else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN) 424 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 425 else 426 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 427 break; 428 429 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 430 ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */ 431 if (ret < 0) 432 return ret; 433 434 /* converted_val = ADC_val * 50mA (table 10.3.19) */ 435 val->intval = ret * 50000; 436 break; 437 438 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 439 val->intval = bq25890_tables[TBL_ICHG].rt.max; 440 break; 441 442 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 443 if (!state.online) { 444 val->intval = 0; 445 break; 446 } 447 448 ret = bq25890_field_read(bq, F_BATV); /* read measured value */ 449 if (ret < 0) 450 return ret; 451 452 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ 453 val->intval = 2304000 + ret * 20000; 454 break; 455 456 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: 457 val->intval = bq25890_tables[TBL_VREG].rt.max; 458 break; 459 460 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: 461 val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM); 462 break; 463 464 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 465 ret = bq25890_field_read(bq, F_SYSV); /* read measured value */ 466 if (ret < 0) 467 return ret; 468 469 /* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */ 470 val->intval = 2304000 + ret * 20000; 471 break; 472 473 default: 474 return -EINVAL; 475 } 476 477 return 0; 478 } 479 480 static int bq25890_get_chip_state(struct bq25890_device *bq, 481 struct bq25890_state *state) 482 { 483 int i, ret; 484 485 struct { 486 enum bq25890_fields id; 487 u8 *data; 488 } state_fields[] = { 489 {F_CHG_STAT, &state->chrg_status}, 490 {F_PG_STAT, &state->online}, 491 {F_VSYS_STAT, &state->vsys_status}, 492 {F_BOOST_FAULT, &state->boost_fault}, 493 {F_BAT_FAULT, &state->bat_fault}, 494 {F_CHG_FAULT, &state->chrg_fault} 495 }; 496 497 for (i = 0; i < ARRAY_SIZE(state_fields); i++) { 498 ret = bq25890_field_read(bq, state_fields[i].id); 499 if (ret < 0) 500 return ret; 501 502 *state_fields[i].data = ret; 503 } 504 505 dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT=%d/%d/%d\n", 506 state->chrg_status, state->online, state->vsys_status, 507 state->chrg_fault, state->boost_fault, state->bat_fault); 508 509 return 0; 510 } 511 512 static bool bq25890_state_changed(struct bq25890_device *bq, 513 struct bq25890_state *new_state) 514 { 515 struct bq25890_state old_state; 516 517 mutex_lock(&bq->lock); 518 old_state = bq->state; 519 mutex_unlock(&bq->lock); 520 521 return (old_state.chrg_status != new_state->chrg_status || 522 old_state.chrg_fault != new_state->chrg_fault || 523 old_state.online != new_state->online || 524 old_state.bat_fault != new_state->bat_fault || 525 old_state.boost_fault != new_state->boost_fault || 526 old_state.vsys_status != new_state->vsys_status); 527 } 528 529 static void bq25890_handle_state_change(struct bq25890_device *bq, 530 struct bq25890_state *new_state) 531 { 532 int ret; 533 struct bq25890_state old_state; 534 535 mutex_lock(&bq->lock); 536 old_state = bq->state; 537 mutex_unlock(&bq->lock); 538 539 if (!new_state->online) { /* power removed */ 540 /* disable ADC */ 541 ret = bq25890_field_write(bq, F_CONV_START, 0); 542 if (ret < 0) 543 goto error; 544 } else if (!old_state.online) { /* power inserted */ 545 /* enable ADC, to have control of charge current/voltage */ 546 ret = bq25890_field_write(bq, F_CONV_START, 1); 547 if (ret < 0) 548 goto error; 549 } 550 551 return; 552 553 error: 554 dev_err(bq->dev, "Error communicating with the chip.\n"); 555 } 556 557 static irqreturn_t bq25890_irq_handler_thread(int irq, void *private) 558 { 559 struct bq25890_device *bq = private; 560 int ret; 561 struct bq25890_state state; 562 563 ret = bq25890_get_chip_state(bq, &state); 564 if (ret < 0) 565 goto handled; 566 567 if (!bq25890_state_changed(bq, &state)) 568 goto handled; 569 570 bq25890_handle_state_change(bq, &state); 571 572 mutex_lock(&bq->lock); 573 bq->state = state; 574 mutex_unlock(&bq->lock); 575 576 power_supply_changed(bq->charger); 577 578 handled: 579 return IRQ_HANDLED; 580 } 581 582 static int bq25890_chip_reset(struct bq25890_device *bq) 583 { 584 int ret; 585 int rst_check_counter = 10; 586 587 ret = bq25890_field_write(bq, F_REG_RST, 1); 588 if (ret < 0) 589 return ret; 590 591 do { 592 ret = bq25890_field_read(bq, F_REG_RST); 593 if (ret < 0) 594 return ret; 595 596 usleep_range(5, 10); 597 } while (ret == 1 && --rst_check_counter); 598 599 if (!rst_check_counter) 600 return -ETIMEDOUT; 601 602 return 0; 603 } 604 605 static int bq25890_hw_init(struct bq25890_device *bq) 606 { 607 int ret; 608 int i; 609 struct bq25890_state state; 610 611 const struct { 612 enum bq25890_fields id; 613 u32 value; 614 } init_data[] = { 615 {F_ICHG, bq->init_data.ichg}, 616 {F_VREG, bq->init_data.vreg}, 617 {F_ITERM, bq->init_data.iterm}, 618 {F_IPRECHG, bq->init_data.iprechg}, 619 {F_SYSVMIN, bq->init_data.sysvmin}, 620 {F_BOOSTV, bq->init_data.boostv}, 621 {F_BOOSTI, bq->init_data.boosti}, 622 {F_BOOSTF, bq->init_data.boostf}, 623 {F_EN_ILIM, bq->init_data.ilim_en}, 624 {F_TREG, bq->init_data.treg} 625 }; 626 627 ret = bq25890_chip_reset(bq); 628 if (ret < 0) { 629 dev_dbg(bq->dev, "Reset failed %d\n", ret); 630 return ret; 631 } 632 633 /* disable watchdog */ 634 ret = bq25890_field_write(bq, F_WD, 0); 635 if (ret < 0) { 636 dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret); 637 return ret; 638 } 639 640 /* initialize currents/voltages and other parameters */ 641 for (i = 0; i < ARRAY_SIZE(init_data); i++) { 642 ret = bq25890_field_write(bq, init_data[i].id, 643 init_data[i].value); 644 if (ret < 0) { 645 dev_dbg(bq->dev, "Writing init data failed %d\n", ret); 646 return ret; 647 } 648 } 649 650 /* Configure ADC for continuous conversions. This does not enable it. */ 651 ret = bq25890_field_write(bq, F_CONV_RATE, 1); 652 if (ret < 0) { 653 dev_dbg(bq->dev, "Config ADC failed %d\n", ret); 654 return ret; 655 } 656 657 ret = bq25890_get_chip_state(bq, &state); 658 if (ret < 0) { 659 dev_dbg(bq->dev, "Get state failed %d\n", ret); 660 return ret; 661 } 662 663 mutex_lock(&bq->lock); 664 bq->state = state; 665 mutex_unlock(&bq->lock); 666 667 return 0; 668 } 669 670 static enum power_supply_property bq25890_power_supply_props[] = { 671 POWER_SUPPLY_PROP_MANUFACTURER, 672 POWER_SUPPLY_PROP_MODEL_NAME, 673 POWER_SUPPLY_PROP_STATUS, 674 POWER_SUPPLY_PROP_ONLINE, 675 POWER_SUPPLY_PROP_HEALTH, 676 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, 677 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 678 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, 679 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 680 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, 681 POWER_SUPPLY_PROP_VOLTAGE_NOW, 682 }; 683 684 static char *bq25890_charger_supplied_to[] = { 685 "main-battery", 686 }; 687 688 static const struct power_supply_desc bq25890_power_supply_desc = { 689 .name = "bq25890-charger", 690 .type = POWER_SUPPLY_TYPE_USB, 691 .properties = bq25890_power_supply_props, 692 .num_properties = ARRAY_SIZE(bq25890_power_supply_props), 693 .get_property = bq25890_power_supply_get_property, 694 }; 695 696 static int bq25890_power_supply_init(struct bq25890_device *bq) 697 { 698 struct power_supply_config psy_cfg = { .drv_data = bq, }; 699 700 psy_cfg.supplied_to = bq25890_charger_supplied_to; 701 psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to); 702 703 bq->charger = power_supply_register(bq->dev, &bq25890_power_supply_desc, 704 &psy_cfg); 705 706 return PTR_ERR_OR_ZERO(bq->charger); 707 } 708 709 static void bq25890_usb_work(struct work_struct *data) 710 { 711 int ret; 712 struct bq25890_device *bq = 713 container_of(data, struct bq25890_device, usb_work); 714 715 switch (bq->usb_event) { 716 case USB_EVENT_ID: 717 /* Enable boost mode */ 718 ret = bq25890_field_write(bq, F_OTG_CFG, 1); 719 if (ret < 0) 720 goto error; 721 break; 722 723 case USB_EVENT_NONE: 724 /* Disable boost mode */ 725 ret = bq25890_field_write(bq, F_OTG_CFG, 0); 726 if (ret < 0) 727 goto error; 728 729 power_supply_changed(bq->charger); 730 break; 731 } 732 733 return; 734 735 error: 736 dev_err(bq->dev, "Error switching to boost/charger mode.\n"); 737 } 738 739 static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val, 740 void *priv) 741 { 742 struct bq25890_device *bq = 743 container_of(nb, struct bq25890_device, usb_nb); 744 745 bq->usb_event = val; 746 queue_work(system_power_efficient_wq, &bq->usb_work); 747 748 return NOTIFY_OK; 749 } 750 751 static int bq25890_irq_probe(struct bq25890_device *bq) 752 { 753 struct gpio_desc *irq; 754 755 irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN); 756 if (IS_ERR(irq)) { 757 dev_err(bq->dev, "Could not probe irq pin.\n"); 758 return PTR_ERR(irq); 759 } 760 761 return gpiod_to_irq(irq); 762 } 763 764 static int bq25890_fw_read_u32_props(struct bq25890_device *bq) 765 { 766 int ret; 767 u32 property; 768 int i; 769 struct bq25890_init_data *init = &bq->init_data; 770 struct { 771 char *name; 772 bool optional; 773 enum bq25890_table_ids tbl_id; 774 u8 *conv_data; /* holds converted value from given property */ 775 } props[] = { 776 /* required properties */ 777 {"ti,charge-current", false, TBL_ICHG, &init->ichg}, 778 {"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg}, 779 {"ti,termination-current", false, TBL_ITERM, &init->iterm}, 780 {"ti,precharge-current", false, TBL_ITERM, &init->iprechg}, 781 {"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin}, 782 {"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv}, 783 {"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti}, 784 785 /* optional properties */ 786 {"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg} 787 }; 788 789 /* initialize data for optional properties */ 790 init->treg = 3; /* 120 degrees Celsius */ 791 792 for (i = 0; i < ARRAY_SIZE(props); i++) { 793 ret = device_property_read_u32(bq->dev, props[i].name, 794 &property); 795 if (ret < 0) { 796 if (props[i].optional) 797 continue; 798 799 dev_err(bq->dev, "Unable to read property %d %s\n", ret, 800 props[i].name); 801 802 return ret; 803 } 804 805 *props[i].conv_data = bq25890_find_idx(property, 806 props[i].tbl_id); 807 } 808 809 return 0; 810 } 811 812 static int bq25890_fw_probe(struct bq25890_device *bq) 813 { 814 int ret; 815 struct bq25890_init_data *init = &bq->init_data; 816 817 ret = bq25890_fw_read_u32_props(bq); 818 if (ret < 0) 819 return ret; 820 821 init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin"); 822 init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq"); 823 824 return 0; 825 } 826 827 static int bq25890_probe(struct i2c_client *client, 828 const struct i2c_device_id *id) 829 { 830 struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); 831 struct device *dev = &client->dev; 832 struct bq25890_device *bq; 833 int ret; 834 int i; 835 836 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 837 dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); 838 return -ENODEV; 839 } 840 841 bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL); 842 if (!bq) 843 return -ENOMEM; 844 845 bq->client = client; 846 bq->dev = dev; 847 848 mutex_init(&bq->lock); 849 850 bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config); 851 if (IS_ERR(bq->rmap)) { 852 dev_err(dev, "failed to allocate register map\n"); 853 return PTR_ERR(bq->rmap); 854 } 855 856 for (i = 0; i < ARRAY_SIZE(bq25890_reg_fields); i++) { 857 const struct reg_field *reg_fields = bq25890_reg_fields; 858 859 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap, 860 reg_fields[i]); 861 if (IS_ERR(bq->rmap_fields[i])) { 862 dev_err(dev, "cannot allocate regmap field\n"); 863 return PTR_ERR(bq->rmap_fields[i]); 864 } 865 } 866 867 i2c_set_clientdata(client, bq); 868 869 bq->chip_id = bq25890_field_read(bq, F_PN); 870 if (bq->chip_id < 0) { 871 dev_err(dev, "Cannot read chip ID.\n"); 872 return bq->chip_id; 873 } 874 875 if ((bq->chip_id != BQ25890_ID) && (bq->chip_id != BQ25896_ID)) { 876 dev_err(dev, "Chip with ID=%d, not supported!\n", bq->chip_id); 877 return -ENODEV; 878 } 879 880 if (!dev->platform_data) { 881 ret = bq25890_fw_probe(bq); 882 if (ret < 0) { 883 dev_err(dev, "Cannot read device properties.\n"); 884 return ret; 885 } 886 } else { 887 return -ENODEV; 888 } 889 890 ret = bq25890_hw_init(bq); 891 if (ret < 0) { 892 dev_err(dev, "Cannot initialize the chip.\n"); 893 return ret; 894 } 895 896 if (client->irq <= 0) 897 client->irq = bq25890_irq_probe(bq); 898 899 if (client->irq < 0) { 900 dev_err(dev, "No irq resource found.\n"); 901 return client->irq; 902 } 903 904 /* OTG reporting */ 905 bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); 906 if (!IS_ERR_OR_NULL(bq->usb_phy)) { 907 INIT_WORK(&bq->usb_work, bq25890_usb_work); 908 bq->usb_nb.notifier_call = bq25890_usb_notifier; 909 usb_register_notifier(bq->usb_phy, &bq->usb_nb); 910 } 911 912 ret = devm_request_threaded_irq(dev, client->irq, NULL, 913 bq25890_irq_handler_thread, 914 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 915 BQ25890_IRQ_PIN, bq); 916 if (ret) 917 goto irq_fail; 918 919 ret = bq25890_power_supply_init(bq); 920 if (ret < 0) { 921 dev_err(dev, "Failed to register power supply\n"); 922 goto irq_fail; 923 } 924 925 return 0; 926 927 irq_fail: 928 if (!IS_ERR_OR_NULL(bq->usb_phy)) 929 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); 930 931 return ret; 932 } 933 934 static int bq25890_remove(struct i2c_client *client) 935 { 936 struct bq25890_device *bq = i2c_get_clientdata(client); 937 938 power_supply_unregister(bq->charger); 939 940 if (!IS_ERR_OR_NULL(bq->usb_phy)) 941 usb_unregister_notifier(bq->usb_phy, &bq->usb_nb); 942 943 /* reset all registers to default values */ 944 bq25890_chip_reset(bq); 945 946 return 0; 947 } 948 949 #ifdef CONFIG_PM_SLEEP 950 static int bq25890_suspend(struct device *dev) 951 { 952 struct bq25890_device *bq = dev_get_drvdata(dev); 953 954 /* 955 * If charger is removed, while in suspend, make sure ADC is diabled 956 * since it consumes slightly more power. 957 */ 958 return bq25890_field_write(bq, F_CONV_START, 0); 959 } 960 961 static int bq25890_resume(struct device *dev) 962 { 963 int ret; 964 struct bq25890_state state; 965 struct bq25890_device *bq = dev_get_drvdata(dev); 966 967 ret = bq25890_get_chip_state(bq, &state); 968 if (ret < 0) 969 return ret; 970 971 mutex_lock(&bq->lock); 972 bq->state = state; 973 mutex_unlock(&bq->lock); 974 975 /* Re-enable ADC only if charger is plugged in. */ 976 if (state.online) { 977 ret = bq25890_field_write(bq, F_CONV_START, 1); 978 if (ret < 0) 979 return ret; 980 } 981 982 /* signal userspace, maybe state changed while suspended */ 983 power_supply_changed(bq->charger); 984 985 return 0; 986 } 987 #endif 988 989 static const struct dev_pm_ops bq25890_pm = { 990 SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume) 991 }; 992 993 static const struct i2c_device_id bq25890_i2c_ids[] = { 994 { "bq25890", 0 }, 995 {}, 996 }; 997 MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids); 998 999 static const struct of_device_id bq25890_of_match[] = { 1000 { .compatible = "ti,bq25890", }, 1001 { }, 1002 }; 1003 MODULE_DEVICE_TABLE(of, bq25890_of_match); 1004 1005 static const struct acpi_device_id bq25890_acpi_match[] = { 1006 {"BQ258900", 0}, 1007 {}, 1008 }; 1009 MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match); 1010 1011 static struct i2c_driver bq25890_driver = { 1012 .driver = { 1013 .name = "bq25890-charger", 1014 .of_match_table = of_match_ptr(bq25890_of_match), 1015 .acpi_match_table = ACPI_PTR(bq25890_acpi_match), 1016 .pm = &bq25890_pm, 1017 }, 1018 .probe = bq25890_probe, 1019 .remove = bq25890_remove, 1020 .id_table = bq25890_i2c_ids, 1021 }; 1022 module_i2c_driver(bq25890_driver); 1023 1024 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); 1025 MODULE_DESCRIPTION("bq25890 charger driver"); 1026 MODULE_LICENSE("GPL"); 1027