1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * TI BQ24257 charger driver 4 * 5 * Copyright (C) 2015 Intel Corporation 6 * 7 * Datasheets: 8 * https://www.ti.com/product/bq24250 9 * https://www.ti.com/product/bq24251 10 * https://www.ti.com/product/bq24257 11 */ 12 13 #include <linux/module.h> 14 #include <linux/i2c.h> 15 #include <linux/power_supply.h> 16 #include <linux/regmap.h> 17 #include <linux/types.h> 18 #include <linux/gpio/consumer.h> 19 #include <linux/interrupt.h> 20 #include <linux/delay.h> 21 22 #include <linux/acpi.h> 23 #include <linux/of.h> 24 25 #define BQ24257_REG_1 0x00 26 #define BQ24257_REG_2 0x01 27 #define BQ24257_REG_3 0x02 28 #define BQ24257_REG_4 0x03 29 #define BQ24257_REG_5 0x04 30 #define BQ24257_REG_6 0x05 31 #define BQ24257_REG_7 0x06 32 33 #define BQ24257_MANUFACTURER "Texas Instruments" 34 #define BQ24257_PG_GPIO "pg" 35 36 #define BQ24257_ILIM_SET_DELAY 1000 /* msec */ 37 38 /* 39 * When adding support for new devices make sure that enum bq2425x_chip and 40 * bq2425x_chip_name[] always stay in sync! 41 */ 42 enum bq2425x_chip { 43 BQ24250, 44 BQ24251, 45 BQ24257, 46 }; 47 48 static const char *const bq2425x_chip_name[] = { 49 "bq24250", 50 "bq24251", 51 "bq24257", 52 }; 53 54 enum bq24257_fields { 55 F_WD_FAULT, F_WD_EN, F_STAT, F_FAULT, /* REG 1 */ 56 F_RESET, F_IILIMIT, F_EN_STAT, F_EN_TERM, F_CE, F_HZ_MODE, /* REG 2 */ 57 F_VBAT, F_USB_DET, /* REG 3 */ 58 F_ICHG, F_ITERM, /* REG 4 */ 59 F_LOOP_STATUS, F_LOW_CHG, F_DPDM_EN, F_CE_STATUS, F_VINDPM, /* REG 5 */ 60 F_X2_TMR_EN, F_TMR, F_SYSOFF, F_TS_EN, F_TS_STAT, /* REG 6 */ 61 F_VOVP, F_CLR_VDP, F_FORCE_BATDET, F_FORCE_PTM, /* REG 7 */ 62 63 F_MAX_FIELDS 64 }; 65 66 /* initial field values, converted from uV/uA */ 67 struct bq24257_init_data { 68 u8 ichg; /* charge current */ 69 u8 vbat; /* regulation voltage */ 70 u8 iterm; /* termination current */ 71 u8 iilimit; /* input current limit */ 72 u8 vovp; /* over voltage protection voltage */ 73 u8 vindpm; /* VDMP input threshold voltage */ 74 }; 75 76 struct bq24257_state { 77 u8 status; 78 u8 fault; 79 bool power_good; 80 }; 81 82 struct bq24257_device { 83 struct i2c_client *client; 84 struct device *dev; 85 struct power_supply *charger; 86 87 enum bq2425x_chip chip; 88 89 struct regmap *rmap; 90 struct regmap_field *rmap_fields[F_MAX_FIELDS]; 91 92 struct gpio_desc *pg; 93 94 struct delayed_work iilimit_setup_work; 95 96 struct bq24257_init_data init_data; 97 struct bq24257_state state; 98 99 struct mutex lock; /* protect state data */ 100 101 bool iilimit_autoset_enable; 102 }; 103 104 static bool bq24257_is_volatile_reg(struct device *dev, unsigned int reg) 105 { 106 switch (reg) { 107 case BQ24257_REG_2: 108 case BQ24257_REG_4: 109 return false; 110 111 default: 112 return true; 113 } 114 } 115 116 static const struct regmap_config bq24257_regmap_config = { 117 .reg_bits = 8, 118 .val_bits = 8, 119 120 .max_register = BQ24257_REG_7, 121 .cache_type = REGCACHE_RBTREE, 122 123 .volatile_reg = bq24257_is_volatile_reg, 124 }; 125 126 static const struct reg_field bq24257_reg_fields[] = { 127 /* REG 1 */ 128 [F_WD_FAULT] = REG_FIELD(BQ24257_REG_1, 7, 7), 129 [F_WD_EN] = REG_FIELD(BQ24257_REG_1, 6, 6), 130 [F_STAT] = REG_FIELD(BQ24257_REG_1, 4, 5), 131 [F_FAULT] = REG_FIELD(BQ24257_REG_1, 0, 3), 132 /* REG 2 */ 133 [F_RESET] = REG_FIELD(BQ24257_REG_2, 7, 7), 134 [F_IILIMIT] = REG_FIELD(BQ24257_REG_2, 4, 6), 135 [F_EN_STAT] = REG_FIELD(BQ24257_REG_2, 3, 3), 136 [F_EN_TERM] = REG_FIELD(BQ24257_REG_2, 2, 2), 137 [F_CE] = REG_FIELD(BQ24257_REG_2, 1, 1), 138 [F_HZ_MODE] = REG_FIELD(BQ24257_REG_2, 0, 0), 139 /* REG 3 */ 140 [F_VBAT] = REG_FIELD(BQ24257_REG_3, 2, 7), 141 [F_USB_DET] = REG_FIELD(BQ24257_REG_3, 0, 1), 142 /* REG 4 */ 143 [F_ICHG] = REG_FIELD(BQ24257_REG_4, 3, 7), 144 [F_ITERM] = REG_FIELD(BQ24257_REG_4, 0, 2), 145 /* REG 5 */ 146 [F_LOOP_STATUS] = REG_FIELD(BQ24257_REG_5, 6, 7), 147 [F_LOW_CHG] = REG_FIELD(BQ24257_REG_5, 5, 5), 148 [F_DPDM_EN] = REG_FIELD(BQ24257_REG_5, 4, 4), 149 [F_CE_STATUS] = REG_FIELD(BQ24257_REG_5, 3, 3), 150 [F_VINDPM] = REG_FIELD(BQ24257_REG_5, 0, 2), 151 /* REG 6 */ 152 [F_X2_TMR_EN] = REG_FIELD(BQ24257_REG_6, 7, 7), 153 [F_TMR] = REG_FIELD(BQ24257_REG_6, 5, 6), 154 [F_SYSOFF] = REG_FIELD(BQ24257_REG_6, 4, 4), 155 [F_TS_EN] = REG_FIELD(BQ24257_REG_6, 3, 3), 156 [F_TS_STAT] = REG_FIELD(BQ24257_REG_6, 0, 2), 157 /* REG 7 */ 158 [F_VOVP] = REG_FIELD(BQ24257_REG_7, 5, 7), 159 [F_CLR_VDP] = REG_FIELD(BQ24257_REG_7, 4, 4), 160 [F_FORCE_BATDET] = REG_FIELD(BQ24257_REG_7, 3, 3), 161 [F_FORCE_PTM] = REG_FIELD(BQ24257_REG_7, 2, 2) 162 }; 163 164 static const u32 bq24257_vbat_map[] = { 165 3500000, 3520000, 3540000, 3560000, 3580000, 3600000, 3620000, 3640000, 166 3660000, 3680000, 3700000, 3720000, 3740000, 3760000, 3780000, 3800000, 167 3820000, 3840000, 3860000, 3880000, 3900000, 3920000, 3940000, 3960000, 168 3980000, 4000000, 4020000, 4040000, 4060000, 4080000, 4100000, 4120000, 169 4140000, 4160000, 4180000, 4200000, 4220000, 4240000, 4260000, 4280000, 170 4300000, 4320000, 4340000, 4360000, 4380000, 4400000, 4420000, 4440000 171 }; 172 173 #define BQ24257_VBAT_MAP_SIZE ARRAY_SIZE(bq24257_vbat_map) 174 175 static const u32 bq24257_ichg_map[] = { 176 500000, 550000, 600000, 650000, 700000, 750000, 800000, 850000, 900000, 177 950000, 1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 178 1350000, 1400000, 1450000, 1500000, 1550000, 1600000, 1650000, 1700000, 179 1750000, 1800000, 1850000, 1900000, 1950000, 2000000 180 }; 181 182 #define BQ24257_ICHG_MAP_SIZE ARRAY_SIZE(bq24257_ichg_map) 183 184 static const u32 bq24257_iterm_map[] = { 185 50000, 75000, 100000, 125000, 150000, 175000, 200000, 225000 186 }; 187 188 #define BQ24257_ITERM_MAP_SIZE ARRAY_SIZE(bq24257_iterm_map) 189 190 static const u32 bq24257_iilimit_map[] = { 191 100000, 150000, 500000, 900000, 1500000, 2000000 192 }; 193 194 #define BQ24257_IILIMIT_MAP_SIZE ARRAY_SIZE(bq24257_iilimit_map) 195 196 static const u32 bq24257_vovp_map[] = { 197 6000000, 6500000, 7000000, 8000000, 9000000, 9500000, 10000000, 198 10500000 199 }; 200 201 #define BQ24257_VOVP_MAP_SIZE ARRAY_SIZE(bq24257_vovp_map) 202 203 static const u32 bq24257_vindpm_map[] = { 204 4200000, 4280000, 4360000, 4440000, 4520000, 4600000, 4680000, 205 4760000 206 }; 207 208 #define BQ24257_VINDPM_MAP_SIZE ARRAY_SIZE(bq24257_vindpm_map) 209 210 static int bq24257_field_read(struct bq24257_device *bq, 211 enum bq24257_fields field_id) 212 { 213 int ret; 214 int val; 215 216 ret = regmap_field_read(bq->rmap_fields[field_id], &val); 217 if (ret < 0) 218 return ret; 219 220 return val; 221 } 222 223 static int bq24257_field_write(struct bq24257_device *bq, 224 enum bq24257_fields field_id, u8 val) 225 { 226 return regmap_field_write(bq->rmap_fields[field_id], val); 227 } 228 229 static u8 bq24257_find_idx(u32 value, const u32 *map, u8 map_size) 230 { 231 u8 idx; 232 233 for (idx = 1; idx < map_size; idx++) 234 if (value < map[idx]) 235 break; 236 237 return idx - 1; 238 } 239 240 enum bq24257_status { 241 STATUS_READY, 242 STATUS_CHARGE_IN_PROGRESS, 243 STATUS_CHARGE_DONE, 244 STATUS_FAULT, 245 }; 246 247 enum bq24257_fault { 248 FAULT_NORMAL, 249 FAULT_INPUT_OVP, 250 FAULT_INPUT_UVLO, 251 FAULT_SLEEP, 252 FAULT_BAT_TS, 253 FAULT_BAT_OVP, 254 FAULT_TS, 255 FAULT_TIMER, 256 FAULT_NO_BAT, 257 FAULT_ISET, 258 FAULT_INPUT_LDO_LOW, 259 }; 260 261 static int bq24257_get_input_current_limit(struct bq24257_device *bq, 262 union power_supply_propval *val) 263 { 264 int ret; 265 266 ret = bq24257_field_read(bq, F_IILIMIT); 267 if (ret < 0) 268 return ret; 269 270 /* 271 * The "External ILIM" and "Production & Test" modes are not exposed 272 * through this driver and not being covered by the lookup table. 273 * Should such a mode have become active let's return an error rather 274 * than exceeding the bounds of the lookup table and returning 275 * garbage. 276 */ 277 if (ret >= BQ24257_IILIMIT_MAP_SIZE) 278 return -ENODATA; 279 280 val->intval = bq24257_iilimit_map[ret]; 281 282 return 0; 283 } 284 285 static int bq24257_set_input_current_limit(struct bq24257_device *bq, 286 const union power_supply_propval *val) 287 { 288 /* 289 * Address the case where the user manually sets an input current limit 290 * while the charger auto-detection mechanism is is active. In this 291 * case we want to abort and go straight to the user-specified value. 292 */ 293 if (bq->iilimit_autoset_enable) 294 cancel_delayed_work_sync(&bq->iilimit_setup_work); 295 296 return bq24257_field_write(bq, F_IILIMIT, 297 bq24257_find_idx(val->intval, 298 bq24257_iilimit_map, 299 BQ24257_IILIMIT_MAP_SIZE)); 300 } 301 302 static int bq24257_power_supply_get_property(struct power_supply *psy, 303 enum power_supply_property psp, 304 union power_supply_propval *val) 305 { 306 struct bq24257_device *bq = power_supply_get_drvdata(psy); 307 struct bq24257_state state; 308 309 mutex_lock(&bq->lock); 310 state = bq->state; 311 mutex_unlock(&bq->lock); 312 313 switch (psp) { 314 case POWER_SUPPLY_PROP_STATUS: 315 if (!state.power_good) 316 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 317 else if (state.status == STATUS_READY) 318 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 319 else if (state.status == STATUS_CHARGE_IN_PROGRESS) 320 val->intval = POWER_SUPPLY_STATUS_CHARGING; 321 else if (state.status == STATUS_CHARGE_DONE) 322 val->intval = POWER_SUPPLY_STATUS_FULL; 323 else 324 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 325 break; 326 327 case POWER_SUPPLY_PROP_MANUFACTURER: 328 val->strval = BQ24257_MANUFACTURER; 329 break; 330 331 case POWER_SUPPLY_PROP_MODEL_NAME: 332 val->strval = bq2425x_chip_name[bq->chip]; 333 break; 334 335 case POWER_SUPPLY_PROP_ONLINE: 336 val->intval = state.power_good; 337 break; 338 339 case POWER_SUPPLY_PROP_HEALTH: 340 switch (state.fault) { 341 case FAULT_NORMAL: 342 val->intval = POWER_SUPPLY_HEALTH_GOOD; 343 break; 344 345 case FAULT_INPUT_OVP: 346 case FAULT_BAT_OVP: 347 val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; 348 break; 349 350 case FAULT_TS: 351 case FAULT_BAT_TS: 352 val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; 353 break; 354 355 case FAULT_TIMER: 356 val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; 357 break; 358 359 default: 360 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; 361 break; 362 } 363 364 break; 365 366 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 367 val->intval = bq24257_ichg_map[bq->init_data.ichg]; 368 break; 369 370 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 371 val->intval = bq24257_ichg_map[BQ24257_ICHG_MAP_SIZE - 1]; 372 break; 373 374 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 375 val->intval = bq24257_vbat_map[bq->init_data.vbat]; 376 break; 377 378 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: 379 val->intval = bq24257_vbat_map[BQ24257_VBAT_MAP_SIZE - 1]; 380 break; 381 382 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: 383 val->intval = bq24257_iterm_map[bq->init_data.iterm]; 384 break; 385 386 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 387 return bq24257_get_input_current_limit(bq, val); 388 389 default: 390 return -EINVAL; 391 } 392 393 return 0; 394 } 395 396 static int bq24257_power_supply_set_property(struct power_supply *psy, 397 enum power_supply_property prop, 398 const union power_supply_propval *val) 399 { 400 struct bq24257_device *bq = power_supply_get_drvdata(psy); 401 402 switch (prop) { 403 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 404 return bq24257_set_input_current_limit(bq, val); 405 default: 406 return -EINVAL; 407 } 408 } 409 410 static int bq24257_power_supply_property_is_writeable(struct power_supply *psy, 411 enum power_supply_property psp) 412 { 413 switch (psp) { 414 case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: 415 return true; 416 default: 417 return false; 418 } 419 } 420 421 static int bq24257_get_chip_state(struct bq24257_device *bq, 422 struct bq24257_state *state) 423 { 424 int ret; 425 426 ret = bq24257_field_read(bq, F_STAT); 427 if (ret < 0) 428 return ret; 429 430 state->status = ret; 431 432 ret = bq24257_field_read(bq, F_FAULT); 433 if (ret < 0) 434 return ret; 435 436 state->fault = ret; 437 438 if (bq->pg) 439 state->power_good = !gpiod_get_value_cansleep(bq->pg); 440 else 441 /* 442 * If we have a chip without a dedicated power-good GPIO or 443 * some other explicit bit that would provide this information 444 * assume the power is good if there is no supply related 445 * fault - and not good otherwise. There is a possibility for 446 * other errors to mask that power in fact is not good but this 447 * is probably the best we can do here. 448 */ 449 switch (state->fault) { 450 case FAULT_INPUT_OVP: 451 case FAULT_INPUT_UVLO: 452 case FAULT_INPUT_LDO_LOW: 453 state->power_good = false; 454 break; 455 default: 456 state->power_good = true; 457 } 458 459 return 0; 460 } 461 462 static bool bq24257_state_changed(struct bq24257_device *bq, 463 struct bq24257_state *new_state) 464 { 465 int ret; 466 467 mutex_lock(&bq->lock); 468 ret = (bq->state.status != new_state->status || 469 bq->state.fault != new_state->fault || 470 bq->state.power_good != new_state->power_good); 471 mutex_unlock(&bq->lock); 472 473 return ret; 474 } 475 476 enum bq24257_loop_status { 477 LOOP_STATUS_NONE, 478 LOOP_STATUS_IN_DPM, 479 LOOP_STATUS_IN_CURRENT_LIMIT, 480 LOOP_STATUS_THERMAL, 481 }; 482 483 enum bq24257_in_ilimit { 484 IILIMIT_100, 485 IILIMIT_150, 486 IILIMIT_500, 487 IILIMIT_900, 488 IILIMIT_1500, 489 IILIMIT_2000, 490 IILIMIT_EXT, 491 IILIMIT_NONE, 492 }; 493 494 enum bq24257_vovp { 495 VOVP_6000, 496 VOVP_6500, 497 VOVP_7000, 498 VOVP_8000, 499 VOVP_9000, 500 VOVP_9500, 501 VOVP_10000, 502 VOVP_10500 503 }; 504 505 enum bq24257_vindpm { 506 VINDPM_4200, 507 VINDPM_4280, 508 VINDPM_4360, 509 VINDPM_4440, 510 VINDPM_4520, 511 VINDPM_4600, 512 VINDPM_4680, 513 VINDPM_4760 514 }; 515 516 enum bq24257_port_type { 517 PORT_TYPE_DCP, /* Dedicated Charging Port */ 518 PORT_TYPE_CDP, /* Charging Downstream Port */ 519 PORT_TYPE_SDP, /* Standard Downstream Port */ 520 PORT_TYPE_NON_STANDARD, 521 }; 522 523 enum bq24257_safety_timer { 524 SAFETY_TIMER_45, 525 SAFETY_TIMER_360, 526 SAFETY_TIMER_540, 527 SAFETY_TIMER_NONE, 528 }; 529 530 static int bq24257_iilimit_autoset(struct bq24257_device *bq) 531 { 532 int loop_status; 533 int iilimit; 534 int port_type; 535 int ret; 536 const u8 new_iilimit[] = { 537 [PORT_TYPE_DCP] = IILIMIT_2000, 538 [PORT_TYPE_CDP] = IILIMIT_2000, 539 [PORT_TYPE_SDP] = IILIMIT_500, 540 [PORT_TYPE_NON_STANDARD] = IILIMIT_500 541 }; 542 543 ret = bq24257_field_read(bq, F_LOOP_STATUS); 544 if (ret < 0) 545 goto error; 546 547 loop_status = ret; 548 549 ret = bq24257_field_read(bq, F_IILIMIT); 550 if (ret < 0) 551 goto error; 552 553 iilimit = ret; 554 555 /* 556 * All USB ports should be able to handle 500mA. If not, DPM will lower 557 * the charging current to accommodate the power source. No need to set 558 * a lower IILIMIT value. 559 */ 560 if (loop_status == LOOP_STATUS_IN_DPM && iilimit == IILIMIT_500) 561 return 0; 562 563 ret = bq24257_field_read(bq, F_USB_DET); 564 if (ret < 0) 565 goto error; 566 567 port_type = ret; 568 569 ret = bq24257_field_write(bq, F_IILIMIT, new_iilimit[port_type]); 570 if (ret < 0) 571 goto error; 572 573 ret = bq24257_field_write(bq, F_TMR, SAFETY_TIMER_360); 574 if (ret < 0) 575 goto error; 576 577 ret = bq24257_field_write(bq, F_CLR_VDP, 1); 578 if (ret < 0) 579 goto error; 580 581 dev_dbg(bq->dev, "port/loop = %d/%d -> iilimit = %d\n", 582 port_type, loop_status, new_iilimit[port_type]); 583 584 return 0; 585 586 error: 587 dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__); 588 return ret; 589 } 590 591 static void bq24257_iilimit_setup_work(struct work_struct *work) 592 { 593 struct bq24257_device *bq = container_of(work, struct bq24257_device, 594 iilimit_setup_work.work); 595 596 bq24257_iilimit_autoset(bq); 597 } 598 599 static void bq24257_handle_state_change(struct bq24257_device *bq, 600 struct bq24257_state *new_state) 601 { 602 int ret; 603 struct bq24257_state old_state; 604 605 mutex_lock(&bq->lock); 606 old_state = bq->state; 607 mutex_unlock(&bq->lock); 608 609 /* 610 * Handle BQ2425x state changes observing whether the D+/D- based input 611 * current limit autoset functionality is enabled. 612 */ 613 if (!new_state->power_good) { 614 dev_dbg(bq->dev, "Power removed\n"); 615 if (bq->iilimit_autoset_enable) { 616 cancel_delayed_work_sync(&bq->iilimit_setup_work); 617 618 /* activate D+/D- port detection algorithm */ 619 ret = bq24257_field_write(bq, F_DPDM_EN, 1); 620 if (ret < 0) 621 goto error; 622 } 623 /* 624 * When power is removed always return to the default input 625 * current limit as configured during probe. 626 */ 627 ret = bq24257_field_write(bq, F_IILIMIT, bq->init_data.iilimit); 628 if (ret < 0) 629 goto error; 630 } else if (!old_state.power_good) { 631 dev_dbg(bq->dev, "Power inserted\n"); 632 633 if (bq->iilimit_autoset_enable) 634 /* configure input current limit */ 635 schedule_delayed_work(&bq->iilimit_setup_work, 636 msecs_to_jiffies(BQ24257_ILIM_SET_DELAY)); 637 } else if (new_state->fault == FAULT_NO_BAT) { 638 dev_warn(bq->dev, "Battery removed\n"); 639 } else if (new_state->fault == FAULT_TIMER) { 640 dev_err(bq->dev, "Safety timer expired! Battery dead?\n"); 641 } 642 643 return; 644 645 error: 646 dev_err(bq->dev, "%s: Error communicating with the chip.\n", __func__); 647 } 648 649 static irqreturn_t bq24257_irq_handler_thread(int irq, void *private) 650 { 651 int ret; 652 struct bq24257_device *bq = private; 653 struct bq24257_state state; 654 655 ret = bq24257_get_chip_state(bq, &state); 656 if (ret < 0) 657 return IRQ_HANDLED; 658 659 if (!bq24257_state_changed(bq, &state)) 660 return IRQ_HANDLED; 661 662 dev_dbg(bq->dev, "irq(state changed): status/fault/pg = %d/%d/%d\n", 663 state.status, state.fault, state.power_good); 664 665 bq24257_handle_state_change(bq, &state); 666 667 mutex_lock(&bq->lock); 668 bq->state = state; 669 mutex_unlock(&bq->lock); 670 671 power_supply_changed(bq->charger); 672 673 return IRQ_HANDLED; 674 } 675 676 static int bq24257_hw_init(struct bq24257_device *bq) 677 { 678 int ret; 679 int i; 680 struct bq24257_state state; 681 682 const struct { 683 int field; 684 u32 value; 685 } init_data[] = { 686 {F_ICHG, bq->init_data.ichg}, 687 {F_VBAT, bq->init_data.vbat}, 688 {F_ITERM, bq->init_data.iterm}, 689 {F_VOVP, bq->init_data.vovp}, 690 {F_VINDPM, bq->init_data.vindpm}, 691 }; 692 693 /* 694 * Disable the watchdog timer to prevent the IC from going back to 695 * default settings after 50 seconds of I2C inactivity. 696 */ 697 ret = bq24257_field_write(bq, F_WD_EN, 0); 698 if (ret < 0) 699 return ret; 700 701 /* configure the charge currents and voltages */ 702 for (i = 0; i < ARRAY_SIZE(init_data); i++) { 703 ret = bq24257_field_write(bq, init_data[i].field, 704 init_data[i].value); 705 if (ret < 0) 706 return ret; 707 } 708 709 ret = bq24257_get_chip_state(bq, &state); 710 if (ret < 0) 711 return ret; 712 713 mutex_lock(&bq->lock); 714 bq->state = state; 715 mutex_unlock(&bq->lock); 716 717 if (!bq->iilimit_autoset_enable) { 718 dev_dbg(bq->dev, "manually setting iilimit = %u\n", 719 bq->init_data.iilimit); 720 721 /* program fixed input current limit */ 722 ret = bq24257_field_write(bq, F_IILIMIT, 723 bq->init_data.iilimit); 724 if (ret < 0) 725 return ret; 726 } else if (!state.power_good) 727 /* activate D+/D- detection algorithm */ 728 ret = bq24257_field_write(bq, F_DPDM_EN, 1); 729 else if (state.fault != FAULT_NO_BAT) 730 ret = bq24257_iilimit_autoset(bq); 731 732 return ret; 733 } 734 735 static enum power_supply_property bq24257_power_supply_props[] = { 736 POWER_SUPPLY_PROP_MANUFACTURER, 737 POWER_SUPPLY_PROP_MODEL_NAME, 738 POWER_SUPPLY_PROP_STATUS, 739 POWER_SUPPLY_PROP_ONLINE, 740 POWER_SUPPLY_PROP_HEALTH, 741 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, 742 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 743 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, 744 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 745 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, 746 POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, 747 }; 748 749 static char *bq24257_charger_supplied_to[] = { 750 "main-battery", 751 }; 752 753 static const struct power_supply_desc bq24257_power_supply_desc = { 754 .name = "bq24257-charger", 755 .type = POWER_SUPPLY_TYPE_USB, 756 .properties = bq24257_power_supply_props, 757 .num_properties = ARRAY_SIZE(bq24257_power_supply_props), 758 .get_property = bq24257_power_supply_get_property, 759 .set_property = bq24257_power_supply_set_property, 760 .property_is_writeable = bq24257_power_supply_property_is_writeable, 761 }; 762 763 static ssize_t bq24257_show_ovp_voltage(struct device *dev, 764 struct device_attribute *attr, 765 char *buf) 766 { 767 struct power_supply *psy = dev_get_drvdata(dev); 768 struct bq24257_device *bq = power_supply_get_drvdata(psy); 769 770 return scnprintf(buf, PAGE_SIZE, "%u\n", 771 bq24257_vovp_map[bq->init_data.vovp]); 772 } 773 774 static ssize_t bq24257_show_in_dpm_voltage(struct device *dev, 775 struct device_attribute *attr, 776 char *buf) 777 { 778 struct power_supply *psy = dev_get_drvdata(dev); 779 struct bq24257_device *bq = power_supply_get_drvdata(psy); 780 781 return scnprintf(buf, PAGE_SIZE, "%u\n", 782 bq24257_vindpm_map[bq->init_data.vindpm]); 783 } 784 785 static ssize_t bq24257_sysfs_show_enable(struct device *dev, 786 struct device_attribute *attr, 787 char *buf) 788 { 789 struct power_supply *psy = dev_get_drvdata(dev); 790 struct bq24257_device *bq = power_supply_get_drvdata(psy); 791 int ret; 792 793 if (strcmp(attr->attr.name, "high_impedance_enable") == 0) 794 ret = bq24257_field_read(bq, F_HZ_MODE); 795 else if (strcmp(attr->attr.name, "sysoff_enable") == 0) 796 ret = bq24257_field_read(bq, F_SYSOFF); 797 else 798 return -EINVAL; 799 800 if (ret < 0) 801 return ret; 802 803 return scnprintf(buf, PAGE_SIZE, "%d\n", ret); 804 } 805 806 static ssize_t bq24257_sysfs_set_enable(struct device *dev, 807 struct device_attribute *attr, 808 const char *buf, 809 size_t count) 810 { 811 struct power_supply *psy = dev_get_drvdata(dev); 812 struct bq24257_device *bq = power_supply_get_drvdata(psy); 813 long val; 814 int ret; 815 816 if (kstrtol(buf, 10, &val) < 0) 817 return -EINVAL; 818 819 if (strcmp(attr->attr.name, "high_impedance_enable") == 0) 820 ret = bq24257_field_write(bq, F_HZ_MODE, (bool)val); 821 else if (strcmp(attr->attr.name, "sysoff_enable") == 0) 822 ret = bq24257_field_write(bq, F_SYSOFF, (bool)val); 823 else 824 return -EINVAL; 825 826 if (ret < 0) 827 return ret; 828 829 return count; 830 } 831 832 static DEVICE_ATTR(ovp_voltage, S_IRUGO, bq24257_show_ovp_voltage, NULL); 833 static DEVICE_ATTR(in_dpm_voltage, S_IRUGO, bq24257_show_in_dpm_voltage, NULL); 834 static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO, 835 bq24257_sysfs_show_enable, bq24257_sysfs_set_enable); 836 static DEVICE_ATTR(sysoff_enable, S_IWUSR | S_IRUGO, 837 bq24257_sysfs_show_enable, bq24257_sysfs_set_enable); 838 839 static struct attribute *bq24257_charger_sysfs_attrs[] = { 840 &dev_attr_ovp_voltage.attr, 841 &dev_attr_in_dpm_voltage.attr, 842 &dev_attr_high_impedance_enable.attr, 843 &dev_attr_sysoff_enable.attr, 844 NULL, 845 }; 846 847 ATTRIBUTE_GROUPS(bq24257_charger_sysfs); 848 849 static int bq24257_power_supply_init(struct bq24257_device *bq) 850 { 851 struct power_supply_config psy_cfg = { .drv_data = bq, }; 852 853 psy_cfg.attr_grp = bq24257_charger_sysfs_groups; 854 psy_cfg.supplied_to = bq24257_charger_supplied_to; 855 psy_cfg.num_supplicants = ARRAY_SIZE(bq24257_charger_supplied_to); 856 857 bq->charger = devm_power_supply_register(bq->dev, 858 &bq24257_power_supply_desc, 859 &psy_cfg); 860 861 return PTR_ERR_OR_ZERO(bq->charger); 862 } 863 864 static void bq24257_pg_gpio_probe(struct bq24257_device *bq) 865 { 866 bq->pg = devm_gpiod_get_optional(bq->dev, BQ24257_PG_GPIO, GPIOD_IN); 867 868 if (PTR_ERR(bq->pg) == -EPROBE_DEFER) { 869 dev_info(bq->dev, "probe retry requested for PG pin\n"); 870 return; 871 } else if (IS_ERR(bq->pg)) { 872 dev_err(bq->dev, "error probing PG pin\n"); 873 bq->pg = NULL; 874 return; 875 } 876 877 if (bq->pg) 878 dev_dbg(bq->dev, "probed PG pin = %d\n", desc_to_gpio(bq->pg)); 879 } 880 881 static int bq24257_fw_probe(struct bq24257_device *bq) 882 { 883 int ret; 884 u32 property; 885 886 /* Required properties */ 887 ret = device_property_read_u32(bq->dev, "ti,charge-current", &property); 888 if (ret < 0) 889 return ret; 890 891 bq->init_data.ichg = bq24257_find_idx(property, bq24257_ichg_map, 892 BQ24257_ICHG_MAP_SIZE); 893 894 ret = device_property_read_u32(bq->dev, "ti,battery-regulation-voltage", 895 &property); 896 if (ret < 0) 897 return ret; 898 899 bq->init_data.vbat = bq24257_find_idx(property, bq24257_vbat_map, 900 BQ24257_VBAT_MAP_SIZE); 901 902 ret = device_property_read_u32(bq->dev, "ti,termination-current", 903 &property); 904 if (ret < 0) 905 return ret; 906 907 bq->init_data.iterm = bq24257_find_idx(property, bq24257_iterm_map, 908 BQ24257_ITERM_MAP_SIZE); 909 910 /* Optional properties. If not provided use reasonable default. */ 911 ret = device_property_read_u32(bq->dev, "ti,current-limit", 912 &property); 913 if (ret < 0) { 914 bq->iilimit_autoset_enable = true; 915 916 /* 917 * Explicitly set a default value which will be needed for 918 * devices that don't support the automatic setting of the input 919 * current limit through the charger type detection mechanism. 920 */ 921 bq->init_data.iilimit = IILIMIT_500; 922 } else 923 bq->init_data.iilimit = 924 bq24257_find_idx(property, 925 bq24257_iilimit_map, 926 BQ24257_IILIMIT_MAP_SIZE); 927 928 ret = device_property_read_u32(bq->dev, "ti,ovp-voltage", 929 &property); 930 if (ret < 0) 931 bq->init_data.vovp = VOVP_6500; 932 else 933 bq->init_data.vovp = bq24257_find_idx(property, 934 bq24257_vovp_map, 935 BQ24257_VOVP_MAP_SIZE); 936 937 ret = device_property_read_u32(bq->dev, "ti,in-dpm-voltage", 938 &property); 939 if (ret < 0) 940 bq->init_data.vindpm = VINDPM_4360; 941 else 942 bq->init_data.vindpm = 943 bq24257_find_idx(property, 944 bq24257_vindpm_map, 945 BQ24257_VINDPM_MAP_SIZE); 946 947 return 0; 948 } 949 950 static int bq24257_probe(struct i2c_client *client, 951 const struct i2c_device_id *id) 952 { 953 struct i2c_adapter *adapter = client->adapter; 954 struct device *dev = &client->dev; 955 const struct acpi_device_id *acpi_id; 956 struct bq24257_device *bq; 957 int ret; 958 int i; 959 960 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 961 dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); 962 return -ENODEV; 963 } 964 965 bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL); 966 if (!bq) 967 return -ENOMEM; 968 969 bq->client = client; 970 bq->dev = dev; 971 972 if (ACPI_HANDLE(dev)) { 973 acpi_id = acpi_match_device(dev->driver->acpi_match_table, 974 &client->dev); 975 if (!acpi_id) { 976 dev_err(dev, "Failed to match ACPI device\n"); 977 return -ENODEV; 978 } 979 bq->chip = (enum bq2425x_chip)acpi_id->driver_data; 980 } else { 981 bq->chip = (enum bq2425x_chip)id->driver_data; 982 } 983 984 mutex_init(&bq->lock); 985 986 bq->rmap = devm_regmap_init_i2c(client, &bq24257_regmap_config); 987 if (IS_ERR(bq->rmap)) { 988 dev_err(dev, "failed to allocate register map\n"); 989 return PTR_ERR(bq->rmap); 990 } 991 992 for (i = 0; i < ARRAY_SIZE(bq24257_reg_fields); i++) { 993 const struct reg_field *reg_fields = bq24257_reg_fields; 994 995 bq->rmap_fields[i] = devm_regmap_field_alloc(dev, bq->rmap, 996 reg_fields[i]); 997 if (IS_ERR(bq->rmap_fields[i])) { 998 dev_err(dev, "cannot allocate regmap field\n"); 999 return PTR_ERR(bq->rmap_fields[i]); 1000 } 1001 } 1002 1003 i2c_set_clientdata(client, bq); 1004 1005 if (!dev->platform_data) { 1006 ret = bq24257_fw_probe(bq); 1007 if (ret < 0) { 1008 dev_err(dev, "Cannot read device properties.\n"); 1009 return ret; 1010 } 1011 } else { 1012 return -ENODEV; 1013 } 1014 1015 /* 1016 * The BQ24250 doesn't support the D+/D- based charger type detection 1017 * used for the automatic setting of the input current limit setting so 1018 * explicitly disable that feature. 1019 */ 1020 if (bq->chip == BQ24250) 1021 bq->iilimit_autoset_enable = false; 1022 1023 if (bq->iilimit_autoset_enable) 1024 INIT_DELAYED_WORK(&bq->iilimit_setup_work, 1025 bq24257_iilimit_setup_work); 1026 1027 /* 1028 * The BQ24250 doesn't have a dedicated Power Good (PG) pin so let's 1029 * not probe for it and instead use a SW-based approach to determine 1030 * the PG state. We also use a SW-based approach for all other devices 1031 * if the PG pin is either not defined or can't be probed. 1032 */ 1033 if (bq->chip != BQ24250) 1034 bq24257_pg_gpio_probe(bq); 1035 1036 if (PTR_ERR(bq->pg) == -EPROBE_DEFER) 1037 return PTR_ERR(bq->pg); 1038 else if (!bq->pg) 1039 dev_info(bq->dev, "using SW-based power-good detection\n"); 1040 1041 /* reset all registers to defaults */ 1042 ret = bq24257_field_write(bq, F_RESET, 1); 1043 if (ret < 0) 1044 return ret; 1045 1046 /* 1047 * Put the RESET bit back to 0, in cache. For some reason the HW always 1048 * returns 1 on this bit, so this is the only way to avoid resetting the 1049 * chip every time we update another field in this register. 1050 */ 1051 ret = bq24257_field_write(bq, F_RESET, 0); 1052 if (ret < 0) 1053 return ret; 1054 1055 ret = bq24257_hw_init(bq); 1056 if (ret < 0) { 1057 dev_err(dev, "Cannot initialize the chip.\n"); 1058 return ret; 1059 } 1060 1061 ret = bq24257_power_supply_init(bq); 1062 if (ret < 0) { 1063 dev_err(dev, "Failed to register power supply\n"); 1064 return ret; 1065 } 1066 1067 ret = devm_request_threaded_irq(dev, client->irq, NULL, 1068 bq24257_irq_handler_thread, 1069 IRQF_TRIGGER_FALLING | 1070 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 1071 bq2425x_chip_name[bq->chip], bq); 1072 if (ret) { 1073 dev_err(dev, "Failed to request IRQ #%d\n", client->irq); 1074 return ret; 1075 } 1076 1077 return 0; 1078 } 1079 1080 static int bq24257_remove(struct i2c_client *client) 1081 { 1082 struct bq24257_device *bq = i2c_get_clientdata(client); 1083 1084 if (bq->iilimit_autoset_enable) 1085 cancel_delayed_work_sync(&bq->iilimit_setup_work); 1086 1087 bq24257_field_write(bq, F_RESET, 1); /* reset to defaults */ 1088 1089 return 0; 1090 } 1091 1092 #ifdef CONFIG_PM_SLEEP 1093 static int bq24257_suspend(struct device *dev) 1094 { 1095 struct bq24257_device *bq = dev_get_drvdata(dev); 1096 int ret = 0; 1097 1098 if (bq->iilimit_autoset_enable) 1099 cancel_delayed_work_sync(&bq->iilimit_setup_work); 1100 1101 /* reset all registers to default (and activate standalone mode) */ 1102 ret = bq24257_field_write(bq, F_RESET, 1); 1103 if (ret < 0) 1104 dev_err(bq->dev, "Cannot reset chip to standalone mode.\n"); 1105 1106 return ret; 1107 } 1108 1109 static int bq24257_resume(struct device *dev) 1110 { 1111 int ret; 1112 struct bq24257_device *bq = dev_get_drvdata(dev); 1113 1114 ret = regcache_drop_region(bq->rmap, BQ24257_REG_1, BQ24257_REG_7); 1115 if (ret < 0) 1116 return ret; 1117 1118 ret = bq24257_field_write(bq, F_RESET, 0); 1119 if (ret < 0) 1120 return ret; 1121 1122 ret = bq24257_hw_init(bq); 1123 if (ret < 0) { 1124 dev_err(bq->dev, "Cannot init chip after resume.\n"); 1125 return ret; 1126 } 1127 1128 /* signal userspace, maybe state changed while suspended */ 1129 power_supply_changed(bq->charger); 1130 1131 return 0; 1132 } 1133 #endif 1134 1135 static const struct dev_pm_ops bq24257_pm = { 1136 SET_SYSTEM_SLEEP_PM_OPS(bq24257_suspend, bq24257_resume) 1137 }; 1138 1139 static const struct i2c_device_id bq24257_i2c_ids[] = { 1140 { "bq24250", BQ24250 }, 1141 { "bq24251", BQ24251 }, 1142 { "bq24257", BQ24257 }, 1143 {}, 1144 }; 1145 MODULE_DEVICE_TABLE(i2c, bq24257_i2c_ids); 1146 1147 static const struct of_device_id bq24257_of_match[] = { 1148 { .compatible = "ti,bq24250", }, 1149 { .compatible = "ti,bq24251", }, 1150 { .compatible = "ti,bq24257", }, 1151 { }, 1152 }; 1153 MODULE_DEVICE_TABLE(of, bq24257_of_match); 1154 1155 static const struct acpi_device_id bq24257_acpi_match[] = { 1156 { "BQ242500", BQ24250 }, 1157 { "BQ242510", BQ24251 }, 1158 { "BQ242570", BQ24257 }, 1159 {}, 1160 }; 1161 MODULE_DEVICE_TABLE(acpi, bq24257_acpi_match); 1162 1163 static struct i2c_driver bq24257_driver = { 1164 .driver = { 1165 .name = "bq24257-charger", 1166 .of_match_table = of_match_ptr(bq24257_of_match), 1167 .acpi_match_table = ACPI_PTR(bq24257_acpi_match), 1168 .pm = &bq24257_pm, 1169 }, 1170 .probe = bq24257_probe, 1171 .remove = bq24257_remove, 1172 .id_table = bq24257_i2c_ids, 1173 }; 1174 module_i2c_driver(bq24257_driver); 1175 1176 MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>"); 1177 MODULE_DESCRIPTION("bq24257 charger driver"); 1178 MODULE_LICENSE("GPL"); 1179