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bd99954-charger.c
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linux-6.19.14/drivers/power/supply/bd99954-charger.c
1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * ROHM BD99954 charger driver 4 * 5 * Copyright (C) 2020 Rohm Semiconductors 6 * Originally written by: 7 * Mikko Mutanen <mikko.mutanen@fi.rohmeurope.com> 8 * Markus Laine <markus.laine@fi.rohmeurope.com> 9 * Bugs added by: 10 * Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> 11 */ 12 13/* 14 * The battery charging profile of BD99954. 15 * 16 * Curve (1) represents charging current. 17 * Curve (2) represents battery voltage. 18 * 19 * The BD99954 data sheet divides charging to three phases. 20 * a) Trickle-charge with constant current (8). 21 * b) pre-charge with constant current (6) 22 * c) fast-charge, first with constant current (5) phase. After 23 * the battery voltage has reached target level (4) we have constant 24 * voltage phase until charging current has dropped to termination 25 * level (7) 26 * 27 * V ^ ^ I 28 * . . 29 * . . 30 *(4)` `.` ` ` ` ` ` ` ` ` ` ` ` ` ` ----------------------------. 31 * . :/ . 32 * . o----+/:/ ` ` ` ` ` ` ` ` ` ` ` ` `.` ` (5) 33 * . + :: + . 34 * . + /- -- . 35 * . +`/- + . 36 * . o/- -: . 37 * . .s. +` . 38 * . .--+ `/ . 39 * . ..`` + .: . 40 * . -` + -- . 41 * . (2) ...`` + :- . 42 * . ...`` + -: . 43 *(3)` `.`."" ` ` ` `+-------- ` ` ` ` ` ` `.:` ` ` ` ` ` ` ` ` .` ` (6) 44 * . + `:. . 45 * . + -: . 46 * . + -:. . 47 * . + .--. . 48 * . (1) + `.+` ` ` `.` ` (7) 49 * -..............` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` ` + ` ` ` .` ` (8) 50 * . + - 51 * -------------------------------------------------+++++++++--> 52 * | trickle | pre | fast | 53 * 54 * Details of DT properties for different limits can be found from BD99954 55 * device tree binding documentation. 56 */ 57 58#include <linux/delay.h> 59#include <linux/gpio/consumer.h> 60#include <linux/interrupt.h> 61#include <linux/i2c.h> 62#include <linux/kernel.h> 63#include <linux/linear_range.h> 64#include <linux/module.h> 65#include <linux/mod_devicetable.h> 66#include <linux/power_supply.h> 67#include <linux/property.h> 68#include <linux/regmap.h> 69#include <linux/types.h> 70 71#include "bd99954-charger.h" 72 73/* Initial field values, converted to initial register values */ 74struct bd9995x_init_data { 75 u16 vsysreg_set; /* VSYS Regulation Setting */ 76 u16 ibus_lim_set; /* VBUS input current limitation */ 77 u16 icc_lim_set; /* VCC/VACP Input Current Limit Setting */ 78 u16 itrich_set; /* Trickle-charge Current Setting */ 79 u16 iprech_set; /* Pre-Charge Current Setting */ 80 u16 ichg_set; /* Fast-Charge constant current */ 81 u16 vfastchg_reg_set1; /* Fast Charging Regulation Voltage */ 82 u16 vprechg_th_set; /* Pre-charge Voltage Threshold Setting */ 83 u16 vrechg_set; /* Re-charge Battery Voltage Setting */ 84 u16 vbatovp_set; /* Battery Over Voltage Threshold Setting */ 85 u16 iterm_set; /* Charging termination current */ 86}; 87 88struct bd9995x_state { 89 u8 online; 90 u16 chgstm_status; 91 u16 vbat_vsys_status; 92 u16 vbus_vcc_status; 93}; 94 95struct bd9995x_device { 96 struct i2c_client *client; 97 struct device *dev; 98 struct power_supply *charger; 99 100 struct regmap *rmap; 101 struct regmap_field *rmap_fields[F_MAX_FIELDS]; 102 103 int chip_id; 104 int chip_rev; 105 struct bd9995x_init_data init_data; 106 struct bd9995x_state state; 107 108 struct mutex lock; /* Protect state data */ 109}; 110 111static const struct regmap_range bd9995x_readonly_reg_ranges[] = { 112 regmap_reg_range(CHGSTM_STATUS, SEL_ILIM_VAL), 113 regmap_reg_range(IOUT_DACIN_VAL, IOUT_DACIN_VAL), 114 regmap_reg_range(VCC_UCD_STATUS, VCC_IDD_STATUS), 115 regmap_reg_range(VBUS_UCD_STATUS, VBUS_IDD_STATUS), 116 regmap_reg_range(CHIP_ID, CHIP_REV), 117 regmap_reg_range(SYSTEM_STATUS, SYSTEM_STATUS), 118 regmap_reg_range(IBATP_VAL, VBAT_AVE_VAL), 119 regmap_reg_range(VTH_VAL, EXTIADP_AVE_VAL), 120}; 121 122static const struct regmap_access_table bd9995x_writeable_regs = { 123 .no_ranges = bd9995x_readonly_reg_ranges, 124 .n_no_ranges = ARRAY_SIZE(bd9995x_readonly_reg_ranges), 125}; 126 127static const struct regmap_range bd9995x_volatile_reg_ranges[] = { 128 regmap_reg_range(CHGSTM_STATUS, WDT_STATUS), 129 regmap_reg_range(VCC_UCD_STATUS, VCC_IDD_STATUS), 130 regmap_reg_range(VBUS_UCD_STATUS, VBUS_IDD_STATUS), 131 regmap_reg_range(INT0_STATUS, INT7_STATUS), 132 regmap_reg_range(SYSTEM_STATUS, SYSTEM_CTRL_SET), 133 regmap_reg_range(IBATP_VAL, EXTIADP_AVE_VAL), /* Measurement regs */ 134}; 135 136static const struct regmap_access_table bd9995x_volatile_regs = { 137 .yes_ranges = bd9995x_volatile_reg_ranges, 138 .n_yes_ranges = ARRAY_SIZE(bd9995x_volatile_reg_ranges), 139}; 140 141static const struct regmap_range_cfg regmap_range_cfg[] = { 142 { 143 .selector_reg = MAP_SET, 144 .selector_mask = 0xFFFF, 145 .selector_shift = 0, 146 .window_start = 0, 147 .window_len = 0x100, 148 .range_min = 0 * 0x100, 149 .range_max = 3 * 0x100, 150 }, 151}; 152 153static const struct regmap_config bd9995x_regmap_config = { 154 .reg_bits = 8, 155 .val_bits = 16, 156 .reg_stride = 1, 157 158 .max_register = 3 * 0x100, 159 .cache_type = REGCACHE_MAPLE, 160 161 .ranges = regmap_range_cfg, 162 .num_ranges = ARRAY_SIZE(regmap_range_cfg), 163 .val_format_endian = REGMAP_ENDIAN_LITTLE, 164 .wr_table = &bd9995x_writeable_regs, 165 .volatile_table = &bd9995x_volatile_regs, 166}; 167 168enum bd9995x_chrg_fault { 169 CHRG_FAULT_NORMAL, 170 CHRG_FAULT_INPUT, 171 CHRG_FAULT_THERMAL_SHUTDOWN, 172 CHRG_FAULT_TIMER_EXPIRED, 173}; 174 175static int bd9995x_get_prop_batt_health(struct bd9995x_device *bd) 176{ 177 int ret, tmp; 178 179 ret = regmap_field_read(bd->rmap_fields[F_BATTEMP], &tmp); 180 if (ret) 181 return POWER_SUPPLY_HEALTH_UNKNOWN; 182 183 /* TODO: Check these against datasheet page 34 */ 184 185 switch (tmp) { 186 case ROOM: 187 return POWER_SUPPLY_HEALTH_GOOD; 188 case HOT1: 189 case HOT2: 190 case HOT3: 191 return POWER_SUPPLY_HEALTH_OVERHEAT; 192 case COLD1: 193 case COLD2: 194 return POWER_SUPPLY_HEALTH_COLD; 195 case TEMP_DIS: 196 case BATT_OPEN: 197 default: 198 return POWER_SUPPLY_HEALTH_UNKNOWN; 199 } 200} 201 202static int bd9995x_get_prop_charge_type(struct bd9995x_device *bd) 203{ 204 int ret, tmp; 205 206 ret = regmap_field_read(bd->rmap_fields[F_CHGSTM_STATE], &tmp); 207 if (ret) 208 return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; 209 210 switch (tmp) { 211 case CHGSTM_TRICKLE_CHARGE: 212 case CHGSTM_PRE_CHARGE: 213 return POWER_SUPPLY_CHARGE_TYPE_TRICKLE; 214 case CHGSTM_FAST_CHARGE: 215 return POWER_SUPPLY_CHARGE_TYPE_FAST; 216 case CHGSTM_TOP_OFF: 217 case CHGSTM_DONE: 218 case CHGSTM_SUSPEND: 219 return POWER_SUPPLY_CHARGE_TYPE_NONE; 220 default: /* Rest of the states are error related, no charging */ 221 return POWER_SUPPLY_CHARGE_TYPE_NONE; 222 } 223} 224 225static bool bd9995x_get_prop_batt_present(struct bd9995x_device *bd) 226{ 227 int ret, tmp; 228 229 ret = regmap_field_read(bd->rmap_fields[F_BATTEMP], &tmp); 230 if (ret) 231 return false; 232 233 return tmp != BATT_OPEN; 234} 235 236static int bd9995x_get_prop_batt_voltage(struct bd9995x_device *bd) 237{ 238 int ret, tmp; 239 240 ret = regmap_field_read(bd->rmap_fields[F_VBAT_VAL], &tmp); 241 if (ret) 242 return 0; 243 244 tmp = min(tmp, 19200); 245 246 return tmp * 1000; 247} 248 249static int bd9995x_get_prop_batt_current(struct bd9995x_device *bd) 250{ 251 int ret, tmp; 252 253 ret = regmap_field_read(bd->rmap_fields[F_IBATP_VAL], &tmp); 254 if (ret) 255 return 0; 256 257 return tmp * 1000; 258} 259 260#define DEFAULT_BATTERY_TEMPERATURE 250 261 262static int bd9995x_get_prop_batt_temp(struct bd9995x_device *bd) 263{ 264 int ret, tmp; 265 266 ret = regmap_field_read(bd->rmap_fields[F_THERM_VAL], &tmp); 267 if (ret) 268 return DEFAULT_BATTERY_TEMPERATURE; 269 270 return (200 - tmp) * 10; 271} 272 273static int bd9995x_power_supply_get_property(struct power_supply *psy, 274 enum power_supply_property psp, 275 union power_supply_propval *val) 276{ 277 int ret, tmp; 278 struct bd9995x_device *bd = power_supply_get_drvdata(psy); 279 struct bd9995x_state state; 280 281 mutex_lock(&bd->lock); 282 state = bd->state; 283 mutex_unlock(&bd->lock); 284 285 switch (psp) { 286 case POWER_SUPPLY_PROP_STATUS: 287 switch (state.chgstm_status) { 288 case CHGSTM_TRICKLE_CHARGE: 289 case CHGSTM_PRE_CHARGE: 290 case CHGSTM_FAST_CHARGE: 291 case CHGSTM_TOP_OFF: 292 val->intval = POWER_SUPPLY_STATUS_CHARGING; 293 break; 294 295 case CHGSTM_DONE: 296 val->intval = POWER_SUPPLY_STATUS_FULL; 297 break; 298 299 case CHGSTM_SUSPEND: 300 case CHGSTM_TEMPERATURE_ERROR_1: 301 case CHGSTM_TEMPERATURE_ERROR_2: 302 case CHGSTM_TEMPERATURE_ERROR_3: 303 case CHGSTM_TEMPERATURE_ERROR_4: 304 case CHGSTM_TEMPERATURE_ERROR_5: 305 case CHGSTM_TEMPERATURE_ERROR_6: 306 case CHGSTM_TEMPERATURE_ERROR_7: 307 case CHGSTM_THERMAL_SHUT_DOWN_1: 308 case CHGSTM_THERMAL_SHUT_DOWN_2: 309 case CHGSTM_THERMAL_SHUT_DOWN_3: 310 case CHGSTM_THERMAL_SHUT_DOWN_4: 311 case CHGSTM_THERMAL_SHUT_DOWN_5: 312 case CHGSTM_THERMAL_SHUT_DOWN_6: 313 case CHGSTM_THERMAL_SHUT_DOWN_7: 314 case CHGSTM_BATTERY_ERROR: 315 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 316 break; 317 318 default: 319 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 320 break; 321 } 322 break; 323 324 case POWER_SUPPLY_PROP_MANUFACTURER: 325 val->strval = BD9995X_MANUFACTURER; 326 break; 327 328 case POWER_SUPPLY_PROP_ONLINE: 329 val->intval = state.online; 330 break; 331 332 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: 333 ret = regmap_field_read(bd->rmap_fields[F_IBATP_VAL], &tmp); 334 if (ret) 335 return ret; 336 val->intval = tmp * 1000; 337 break; 338 339 case POWER_SUPPLY_PROP_CHARGE_AVG: 340 ret = regmap_field_read(bd->rmap_fields[F_IBATP_AVE_VAL], &tmp); 341 if (ret) 342 return ret; 343 val->intval = tmp * 1000; 344 break; 345 346 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 347 /* 348 * Currently the DT uses this property to give the 349 * target current for fast-charging constant current phase. 350 * I think it is correct in a sense. 351 * 352 * Yet, this prop we read and return here is the programmed 353 * safety limit for combined input currents. This feels 354 * also correct in a sense. 355 * 356 * However, this results a mismatch to DT value and value 357 * read from sysfs. 358 */ 359 ret = regmap_field_read(bd->rmap_fields[F_SEL_ILIM_VAL], &tmp); 360 if (ret) 361 return ret; 362 val->intval = tmp * 1000; 363 break; 364 365 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: 366 if (!state.online) { 367 val->intval = 0; 368 break; 369 } 370 371 ret = regmap_field_read(bd->rmap_fields[F_VFASTCHG_REG_SET1], 372 &tmp); 373 if (ret) 374 return ret; 375 376 /* 377 * The actual range : 2560 to 19200 mV. No matter what the 378 * register says 379 */ 380 val->intval = clamp_val(tmp << 4, 2560, 19200); 381 val->intval *= 1000; 382 break; 383 384 case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: 385 ret = regmap_field_read(bd->rmap_fields[F_ITERM_SET], &tmp); 386 if (ret) 387 return ret; 388 /* Start step is 64 mA */ 389 val->intval = tmp << 6; 390 /* Maximum is 1024 mA - no matter what register says */ 391 val->intval = min(val->intval, 1024); 392 val->intval *= 1000; 393 break; 394 395 /* Battery properties which we access through charger */ 396 case POWER_SUPPLY_PROP_PRESENT: 397 val->intval = bd9995x_get_prop_batt_present(bd); 398 break; 399 400 case POWER_SUPPLY_PROP_VOLTAGE_NOW: 401 val->intval = bd9995x_get_prop_batt_voltage(bd); 402 break; 403 404 case POWER_SUPPLY_PROP_CURRENT_NOW: 405 val->intval = bd9995x_get_prop_batt_current(bd); 406 break; 407 408 case POWER_SUPPLY_PROP_CHARGE_TYPE: 409 val->intval = bd9995x_get_prop_charge_type(bd); 410 break; 411 412 case POWER_SUPPLY_PROP_HEALTH: 413 val->intval = bd9995x_get_prop_batt_health(bd); 414 break; 415 416 case POWER_SUPPLY_PROP_TEMP: 417 val->intval = bd9995x_get_prop_batt_temp(bd); 418 break; 419 420 case POWER_SUPPLY_PROP_TECHNOLOGY: 421 val->intval = POWER_SUPPLY_TECHNOLOGY_LION; 422 break; 423 424 case POWER_SUPPLY_PROP_MODEL_NAME: 425 val->strval = "bd99954"; 426 break; 427 428 default: 429 return -EINVAL; 430 431 } 432 433 return 0; 434} 435 436static int bd9995x_get_chip_state(struct bd9995x_device *bd, 437 struct bd9995x_state *state) 438{ 439 int i, ret, tmp; 440 struct { 441 struct regmap_field *id; 442 u16 *data; 443 } state_fields[] = { 444 { 445 bd->rmap_fields[F_CHGSTM_STATE], &state->chgstm_status, 446 }, { 447 bd->rmap_fields[F_VBAT_VSYS_STATUS], 448 &state->vbat_vsys_status, 449 }, { 450 bd->rmap_fields[F_VBUS_VCC_STATUS], 451 &state->vbus_vcc_status, 452 }, 453 }; 454 455 456 for (i = 0; i < ARRAY_SIZE(state_fields); i++) { 457 ret = regmap_field_read(state_fields[i].id, &tmp); 458 if (ret) 459 return ret; 460 461 *state_fields[i].data = tmp; 462 } 463 464 if (state->vbus_vcc_status & STATUS_VCC_DET || 465 state->vbus_vcc_status & STATUS_VBUS_DET) 466 state->online = 1; 467 else 468 state->online = 0; 469 470 return 0; 471} 472 473static irqreturn_t bd9995x_irq_handler_thread(int irq, void *private) 474{ 475 struct bd9995x_device *bd = private; 476 int ret, status, mask, i; 477 unsigned long tmp; 478 struct bd9995x_state state; 479 480 /* 481 * The bd9995x does not seem to generate big amount of interrupts. 482 * The logic regarding which interrupts can cause relevant 483 * status changes seem to be pretty complex. 484 * 485 * So lets implement really simple and hopefully bullet-proof handler: 486 * It does not really matter which IRQ we handle, we just go and 487 * re-read all interesting statuses + give the framework a nudge. 488 * 489 * Other option would be building a _complex_ and error prone logic 490 * trying to decide what could have been changed (resulting this IRQ 491 * we are now handling). During the normal operation the BD99954 does 492 * not seem to be generating much of interrupts so benefit from such 493 * logic would probably be minimal. 494 */ 495 496 ret = regmap_read(bd->rmap, INT0_STATUS, &status); 497 if (ret) { 498 dev_err(bd->dev, "Failed to read IRQ status\n"); 499 return IRQ_NONE; 500 } 501 502 ret = regmap_field_read(bd->rmap_fields[F_INT0_SET], &mask); 503 if (ret) { 504 dev_err(bd->dev, "Failed to read IRQ mask\n"); 505 return IRQ_NONE; 506 } 507 508 /* Handle only IRQs that are not masked */ 509 status &= mask; 510 tmp = status; 511 512 /* Lowest bit does not represent any sub-registers */ 513 tmp >>= 1; 514 515 /* 516 * Mask and ack IRQs we will handle (+ the idiot bit) 517 */ 518 ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], 0); 519 if (ret) { 520 dev_err(bd->dev, "Failed to mask F_INT0\n"); 521 return IRQ_NONE; 522 } 523 524 ret = regmap_write(bd->rmap, INT0_STATUS, status); 525 if (ret) { 526 dev_err(bd->dev, "Failed to ack F_INT0\n"); 527 goto err_umask; 528 } 529 530 for_each_set_bit(i, &tmp, 7) { 531 int sub_status, sub_mask; 532 static const int sub_status_reg[] = { 533 INT1_STATUS, INT2_STATUS, INT3_STATUS, INT4_STATUS, 534 INT5_STATUS, INT6_STATUS, INT7_STATUS, 535 }; 536 struct regmap_field *sub_mask_f[] = { 537 bd->rmap_fields[F_INT1_SET], 538 bd->rmap_fields[F_INT2_SET], 539 bd->rmap_fields[F_INT3_SET], 540 bd->rmap_fields[F_INT4_SET], 541 bd->rmap_fields[F_INT5_SET], 542 bd->rmap_fields[F_INT6_SET], 543 bd->rmap_fields[F_INT7_SET], 544 }; 545 546 /* Clear sub IRQs */ 547 ret = regmap_read(bd->rmap, sub_status_reg[i], &sub_status); 548 if (ret) { 549 dev_err(bd->dev, "Failed to read IRQ sub-status\n"); 550 goto err_umask; 551 } 552 553 ret = regmap_field_read(sub_mask_f[i], &sub_mask); 554 if (ret) { 555 dev_err(bd->dev, "Failed to read IRQ sub-mask\n"); 556 goto err_umask; 557 } 558 559 /* Ack active sub-statuses */ 560 sub_status &= sub_mask; 561 562 ret = regmap_write(bd->rmap, sub_status_reg[i], sub_status); 563 if (ret) { 564 dev_err(bd->dev, "Failed to ack sub-IRQ\n"); 565 goto err_umask; 566 } 567 } 568 569 ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], mask); 570 if (ret) 571 /* May as well retry once */ 572 goto err_umask; 573 574 /* Read whole chip state */ 575 ret = bd9995x_get_chip_state(bd, &state); 576 if (ret < 0) { 577 dev_err(bd->dev, "Failed to read chip state\n"); 578 } else { 579 mutex_lock(&bd->lock); 580 bd->state = state; 581 mutex_unlock(&bd->lock); 582 583 power_supply_changed(bd->charger); 584 } 585 586 return IRQ_HANDLED; 587 588err_umask: 589 ret = regmap_field_write(bd->rmap_fields[F_INT0_SET], mask); 590 if (ret) 591 dev_err(bd->dev, 592 "Failed to un-mask F_INT0 - IRQ permanently disabled\n"); 593 594 return IRQ_NONE; 595} 596 597static int __bd9995x_chip_reset(struct bd9995x_device *bd) 598{ 599 int ret, state; 600 int rst_check_counter = 10; 601 u16 tmp = ALLRST | OTPLD; 602 603 ret = regmap_raw_write(bd->rmap, SYSTEM_CTRL_SET, &tmp, 2); 604 if (ret < 0) 605 return ret; 606 607 do { 608 ret = regmap_field_read(bd->rmap_fields[F_OTPLD_STATE], &state); 609 if (ret) 610 return ret; 611 612 msleep(10); 613 } while (state == 0 && --rst_check_counter); 614 615 if (!rst_check_counter) { 616 dev_err(bd->dev, "chip reset not completed\n"); 617 return -ETIMEDOUT; 618 } 619 620 tmp = 0; 621 ret = regmap_raw_write(bd->rmap, SYSTEM_CTRL_SET, &tmp, 2); 622 623 return ret; 624} 625 626static int bd9995x_hw_init(struct bd9995x_device *bd) 627{ 628 int ret; 629 int i; 630 struct bd9995x_state state; 631 struct bd9995x_init_data *id = &bd->init_data; 632 633 const struct { 634 enum bd9995x_fields id; 635 u16 value; 636 } init_data[] = { 637 /* Enable the charging trigger after SDP charger attached */ 638 {F_SDP_CHG_TRIG_EN, 1}, 639 /* Enable charging trigger after SDP charger attached */ 640 {F_SDP_CHG_TRIG, 1}, 641 /* Disable charging trigger by BC1.2 detection */ 642 {F_VBUS_BC_DISEN, 1}, 643 /* Disable charging trigger by BC1.2 detection */ 644 {F_VCC_BC_DISEN, 1}, 645 /* Disable automatic limitation of the input current */ 646 {F_ILIM_AUTO_DISEN, 1}, 647 /* Select current limitation when SDP charger attached*/ 648 {F_SDP_500_SEL, 1}, 649 /* Select current limitation when DCP charger attached */ 650 {F_DCP_2500_SEL, 1}, 651 {F_VSYSREG_SET, id->vsysreg_set}, 652 /* Activate USB charging and DC/DC converter */ 653 {F_USB_SUS, 0}, 654 /* DCDC clock: 1200 kHz*/ 655 {F_DCDC_CLK_SEL, 3}, 656 /* Enable charging */ 657 {F_CHG_EN, 1}, 658 /* Disable Input current Limit setting voltage measurement */ 659 {F_EXTIADPEN, 0}, 660 /* Disable input current limiting */ 661 {F_VSYS_PRIORITY, 1}, 662 {F_IBUS_LIM_SET, id->ibus_lim_set}, 663 {F_ICC_LIM_SET, id->icc_lim_set}, 664 /* Charge Termination Current Setting to 0*/ 665 {F_ITERM_SET, id->iterm_set}, 666 /* Trickle-charge Current Setting */ 667 {F_ITRICH_SET, id->itrich_set}, 668 /* Pre-charge Current setting */ 669 {F_IPRECH_SET, id->iprech_set}, 670 /* Fast Charge Current for constant current phase */ 671 {F_ICHG_SET, id->ichg_set}, 672 /* Fast Charge Voltage Regulation Setting */ 673 {F_VFASTCHG_REG_SET1, id->vfastchg_reg_set1}, 674 /* Set Pre-charge Voltage Threshold for trickle charging. */ 675 {F_VPRECHG_TH_SET, id->vprechg_th_set}, 676 {F_VRECHG_SET, id->vrechg_set}, 677 {F_VBATOVP_SET, id->vbatovp_set}, 678 /* Reverse buck boost voltage Setting */ 679 {F_VRBOOST_SET, 0}, 680 /* Disable fast-charging watchdog */ 681 {F_WDT_FST, 0}, 682 /* Disable pre-charging watchdog */ 683 {F_WDT_PRE, 0}, 684 /* Power save off */ 685 {F_POWER_SAVE_MODE, 0}, 686 {F_INT1_SET, INT1_ALL}, 687 {F_INT2_SET, INT2_ALL}, 688 {F_INT3_SET, INT3_ALL}, 689 {F_INT4_SET, INT4_ALL}, 690 {F_INT5_SET, INT5_ALL}, 691 {F_INT6_SET, INT6_ALL}, 692 {F_INT7_SET, INT7_ALL}, 693 }; 694 695 /* 696 * Currently we initialize charger to a known state at startup. 697 * If we want to allow for example the boot code to initialize 698 * charger we should get rid of this. 699 */ 700 ret = __bd9995x_chip_reset(bd); 701 if (ret < 0) 702 return ret; 703 704 /* Initialize currents/voltages and other parameters */ 705 for (i = 0; i < ARRAY_SIZE(init_data); i++) { 706 ret = regmap_field_write(bd->rmap_fields[init_data[i].id], 707 init_data[i].value); 708 if (ret) { 709 dev_err(bd->dev, "failed to initialize charger (%d)\n", 710 ret); 711 return ret; 712 } 713 } 714 715 ret = bd9995x_get_chip_state(bd, &state); 716 if (ret < 0) 717 return ret; 718 719 mutex_lock(&bd->lock); 720 bd->state = state; 721 mutex_unlock(&bd->lock); 722 723 return 0; 724} 725 726static enum power_supply_property bd9995x_power_supply_props[] = { 727 POWER_SUPPLY_PROP_MANUFACTURER, 728 POWER_SUPPLY_PROP_STATUS, 729 POWER_SUPPLY_PROP_ONLINE, 730 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, 731 POWER_SUPPLY_PROP_CHARGE_AVG, 732 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 733 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, 734 POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, 735 /* Battery props we access through charger */ 736 POWER_SUPPLY_PROP_PRESENT, 737 POWER_SUPPLY_PROP_VOLTAGE_NOW, 738 POWER_SUPPLY_PROP_CURRENT_NOW, 739 POWER_SUPPLY_PROP_CHARGE_TYPE, 740 POWER_SUPPLY_PROP_HEALTH, 741 POWER_SUPPLY_PROP_TEMP, 742 POWER_SUPPLY_PROP_TECHNOLOGY, 743 POWER_SUPPLY_PROP_MODEL_NAME, 744}; 745 746static const struct power_supply_desc bd9995x_power_supply_desc = { 747 .name = "bd9995x-charger", 748 .type = POWER_SUPPLY_TYPE_USB, 749 .properties = bd9995x_power_supply_props, 750 .num_properties = ARRAY_SIZE(bd9995x_power_supply_props), 751 .get_property = bd9995x_power_supply_get_property, 752}; 753 754/* 755 * Limit configurations for vbus-input-current and vcc-vacp-input-current 756 * Minimum limit is 0 uA. Max is 511 * 32000 uA = 16352000 uA. This is 757 * configured by writing a register so that each increment in register 758 * value equals to 32000 uA limit increment. 759 * 760 * Eg, value 0x0 is limit 0, value 0x1 is limit 32000, ... 761 * Describe the setting in linear_range table. 762 */ 763static const struct linear_range input_current_limit_ranges[] = { 764 LINEAR_RANGE(0, 0x0, 0x1ff, 32000), 765}; 766 767/* Possible trickle, pre-charging and termination current values */ 768static const struct linear_range charging_current_ranges[] = { 769 LINEAR_RANGE(0, 0x0, 0x10, 64000), 770 LINEAR_RANGE(1024000, 0x11, 0x1f, 0), 771}; 772 773/* 774 * Fast charging voltage regulation, starting re-charging limit 775 * and battery over voltage protection have same possible values 776 */ 777static const struct linear_range charge_voltage_regulation_ranges[] = { 778 LINEAR_RANGE(2560000, 0, 0xA0, 0), 779 LINEAR_RANGE(2560000, 0xA0, 0x4B0, 16000), 780 LINEAR_RANGE(19200000, 0x4B0, 0x7FF, 0), 781}; 782 783/* Possible VSYS voltage regulation values */ 784static const struct linear_range vsys_voltage_regulation_ranges[] = { 785 LINEAR_RANGE(2560000, 0, 0x28, 0), 786 LINEAR_RANGE(2560000, 0x28, 0x12C, 64000), 787 LINEAR_RANGE(19200000, 0x12C, 0x1FF, 0), 788}; 789 790/* Possible settings for switching from trickle to pre-charging limits */ 791static const struct linear_range trickle_to_pre_threshold_ranges[] = { 792 LINEAR_RANGE(2048000, 0, 0x20, 0), 793 LINEAR_RANGE(2048000, 0x20, 0x12C, 64000), 794 LINEAR_RANGE(19200000, 0x12C, 0x1FF, 0), 795}; 796 797/* Possible current values for fast-charging constant current phase */ 798static const struct linear_range fast_charge_current_ranges[] = { 799 LINEAR_RANGE(0, 0, 0xFF, 64000), 800}; 801 802struct battery_init { 803 const char *name; 804 int *info_data; 805 const struct linear_range *range; 806 int ranges; 807 u16 *data; 808}; 809 810struct dt_init { 811 char *prop; 812 const struct linear_range *range; 813 int ranges; 814 u16 *data; 815}; 816 817static int bd9995x_fw_probe(struct bd9995x_device *bd) 818{ 819 int ret; 820 struct power_supply_battery_info *info; 821 u32 property; 822 int i; 823 int regval; 824 bool found; 825 struct bd9995x_init_data *init = &bd->init_data; 826 struct battery_init battery_inits[] = { 827 { 828 .name = "trickle-charging current", 829 .range = &charging_current_ranges[0], 830 .ranges = 2, 831 .data = &init->itrich_set, 832 }, { 833 .name = "pre-charging current", 834 .range = &charging_current_ranges[0], 835 .ranges = 2, 836 .data = &init->iprech_set, 837 }, { 838 .name = "pre-to-trickle charge voltage threshold", 839 .range = &trickle_to_pre_threshold_ranges[0], 840 .ranges = 2, 841 .data = &init->vprechg_th_set, 842 }, { 843 .name = "charging termination current", 844 .range = &charging_current_ranges[0], 845 .ranges = 2, 846 .data = &init->iterm_set, 847 }, { 848 .name = "charging re-start voltage", 849 .range = &charge_voltage_regulation_ranges[0], 850 .ranges = 2, 851 .data = &init->vrechg_set, 852 }, { 853 .name = "battery overvoltage limit", 854 .range = &charge_voltage_regulation_ranges[0], 855 .ranges = 2, 856 .data = &init->vbatovp_set, 857 }, { 858 .name = "fast-charging max current", 859 .range = &fast_charge_current_ranges[0], 860 .ranges = 1, 861 .data = &init->ichg_set, 862 }, { 863 .name = "fast-charging voltage", 864 .range = &charge_voltage_regulation_ranges[0], 865 .ranges = 2, 866 .data = &init->vfastchg_reg_set1, 867 }, 868 }; 869 struct dt_init props[] = { 870 { 871 .prop = "rohm,vsys-regulation-microvolt", 872 .range = &vsys_voltage_regulation_ranges[0], 873 .ranges = 2, 874 .data = &init->vsysreg_set, 875 }, { 876 .prop = "rohm,vbus-input-current-limit-microamp", 877 .range = &input_current_limit_ranges[0], 878 .ranges = 1, 879 .data = &init->ibus_lim_set, 880 }, { 881 .prop = "rohm,vcc-input-current-limit-microamp", 882 .range = &input_current_limit_ranges[0], 883 .ranges = 1, 884 .data = &init->icc_lim_set, 885 }, 886 }; 887 888 /* 889 * The power_supply_get_battery_info() does not support getting values 890 * from ACPI. Let's fix it if ACPI is required here. 891 */ 892 ret = power_supply_get_battery_info(bd->charger, &info); 893 if (ret < 0) 894 return ret; 895 896 /* Put pointers to the generic battery info */ 897 battery_inits[0].info_data = &info->tricklecharge_current_ua; 898 battery_inits[1].info_data = &info->precharge_current_ua; 899 battery_inits[2].info_data = &info->precharge_voltage_max_uv; 900 battery_inits[3].info_data = &info->charge_term_current_ua; 901 battery_inits[4].info_data = &info->charge_restart_voltage_uv; 902 battery_inits[5].info_data = &info->overvoltage_limit_uv; 903 battery_inits[6].info_data = &info->constant_charge_current_max_ua; 904 battery_inits[7].info_data = &info->constant_charge_voltage_max_uv; 905 906 for (i = 0; i < ARRAY_SIZE(battery_inits); i++) { 907 int val = *battery_inits[i].info_data; 908 const struct linear_range *range = battery_inits[i].range; 909 int ranges = battery_inits[i].ranges; 910 911 if (val == -EINVAL) 912 continue; 913 914 ret = linear_range_get_selector_low_array(range, ranges, val, 915 ®val, &found); 916 if (ret) { 917 dev_err(bd->dev, "Unsupported value for %s\n", 918 battery_inits[i].name); 919 920 power_supply_put_battery_info(bd->charger, info); 921 return -EINVAL; 922 } 923 if (!found) { 924 dev_warn(bd->dev, 925 "Unsupported value for %s - using smaller\n", 926 battery_inits[i].name); 927 } 928 *(battery_inits[i].data) = regval; 929 } 930 931 power_supply_put_battery_info(bd->charger, info); 932 933 for (i = 0; i < ARRAY_SIZE(props); i++) { 934 ret = device_property_read_u32(bd->dev, props[i].prop, 935 &property); 936 if (ret < 0) { 937 dev_err(bd->dev, "failed to read %s", props[i].prop); 938 939 return ret; 940 } 941 942 ret = linear_range_get_selector_low_array(props[i].range, 943 props[i].ranges, 944 property, ®val, 945 &found); 946 if (ret) { 947 dev_err(bd->dev, "Unsupported value for '%s'\n", 948 props[i].prop); 949 950 return -EINVAL; 951 } 952 953 if (!found) { 954 dev_warn(bd->dev, 955 "Unsupported value for '%s' - using smaller\n", 956 props[i].prop); 957 } 958 959 *(props[i].data) = regval; 960 } 961 962 return 0; 963} 964 965static void bd9995x_chip_reset(void *bd) 966{ 967 __bd9995x_chip_reset(bd); 968} 969 970static int bd9995x_probe(struct i2c_client *client) 971{ 972 struct device *dev = &client->dev; 973 struct bd9995x_device *bd; 974 struct power_supply_config psy_cfg = {}; 975 int ret; 976 int i; 977 978 bd = devm_kzalloc(dev, sizeof(*bd), GFP_KERNEL); 979 if (!bd) 980 return -ENOMEM; 981 982 bd->client = client; 983 bd->dev = dev; 984 psy_cfg.drv_data = bd; 985 psy_cfg.fwnode = dev_fwnode(dev); 986 987 mutex_init(&bd->lock); 988 989 bd->rmap = devm_regmap_init_i2c(client, &bd9995x_regmap_config); 990 if (IS_ERR(bd->rmap)) { 991 dev_err(dev, "Failed to setup register access via i2c\n"); 992 return PTR_ERR(bd->rmap); 993 } 994 995 for (i = 0; i < ARRAY_SIZE(bd9995x_reg_fields); i++) { 996 const struct reg_field *reg_fields = bd9995x_reg_fields; 997 998 bd->rmap_fields[i] = devm_regmap_field_alloc(dev, bd->rmap, 999 reg_fields[i]); 1000 if (IS_ERR(bd->rmap_fields[i])) { 1001 dev_err(dev, "cannot allocate regmap field\n"); 1002 return PTR_ERR(bd->rmap_fields[i]); 1003 } 1004 } 1005 1006 i2c_set_clientdata(client, bd); 1007 1008 ret = regmap_field_read(bd->rmap_fields[F_CHIP_ID], &bd->chip_id); 1009 if (ret) { 1010 dev_err(dev, "Cannot read chip ID.\n"); 1011 return ret; 1012 } 1013 1014 if (bd->chip_id != BD99954_ID) { 1015 dev_err(dev, "Chip with ID=0x%x, not supported!\n", 1016 bd->chip_id); 1017 return -ENODEV; 1018 } 1019 1020 ret = regmap_field_read(bd->rmap_fields[F_CHIP_REV], &bd->chip_rev); 1021 if (ret) { 1022 dev_err(dev, "Cannot read revision.\n"); 1023 return ret; 1024 } 1025 1026 dev_info(bd->dev, "Found BD99954 chip rev %d\n", bd->chip_rev); 1027 1028 /* 1029 * We need to init the psy before we can call 1030 * power_supply_get_battery_info() for it 1031 */ 1032 bd->charger = devm_power_supply_register(bd->dev, 1033 &bd9995x_power_supply_desc, 1034 &psy_cfg); 1035 if (IS_ERR(bd->charger)) { 1036 dev_err(dev, "Failed to register power supply\n"); 1037 return PTR_ERR(bd->charger); 1038 } 1039 1040 ret = bd9995x_fw_probe(bd); 1041 if (ret < 0) { 1042 dev_err(dev, "Cannot read device properties.\n"); 1043 return ret; 1044 } 1045 1046 ret = bd9995x_hw_init(bd); 1047 if (ret < 0) { 1048 dev_err(dev, "Cannot initialize the chip.\n"); 1049 return ret; 1050 } 1051 1052 ret = devm_add_action_or_reset(dev, bd9995x_chip_reset, bd); 1053 if (ret) 1054 return ret; 1055 1056 return devm_request_threaded_irq(dev, client->irq, NULL, 1057 bd9995x_irq_handler_thread, 1058 IRQF_TRIGGER_LOW | IRQF_ONESHOT, 1059 BD9995X_IRQ_PIN, bd); 1060} 1061 1062static const struct of_device_id bd9995x_of_match[] = { 1063 { .compatible = "rohm,bd99954", }, 1064 { } 1065}; 1066MODULE_DEVICE_TABLE(of, bd9995x_of_match); 1067 1068static struct i2c_driver bd9995x_driver = { 1069 .driver = { 1070 .name = "bd9995x-charger", 1071 .of_match_table = bd9995x_of_match, 1072 }, 1073 .probe = bd9995x_probe, 1074}; 1075module_i2c_driver(bd9995x_driver); 1076 1077MODULE_AUTHOR("Laine Markus <markus.laine@fi.rohmeurope.com>"); 1078MODULE_DESCRIPTION("ROHM BD99954 charger driver"); 1079MODULE_LICENSE("GPL");
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