1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Charger Driver for Rockchip rk817 4 * 5 * Copyright (c) 2021 Maya Matuszczyk <maccraft123mc@gmail.com> 6 * 7 * Authors: Maya Matuszczyk <maccraft123mc@gmail.com> 8 * Chris Morgan <macromorgan@hotmail.com> 9 */ 10 11 #include <linux/unaligned.h> 12 #include <linux/devm-helpers.h> 13 #include <linux/mfd/rk808.h> 14 #include <linux/irq.h> 15 #include <linux/of.h> 16 #include <linux/platform_device.h> 17 #include <linux/power_supply.h> 18 #include <linux/regmap.h> 19 20 /* Charging statuses reported by hardware register */ 21 enum rk817_charge_status { 22 CHRG_OFF, 23 DEAD_CHRG, 24 TRICKLE_CHRG, 25 CC_OR_CV_CHRG, 26 CHARGE_FINISH, 27 USB_OVER_VOL, 28 BAT_TMP_ERR, 29 BAT_TIM_ERR, 30 }; 31 32 /* 33 * Max charging current read to/written from hardware register. 34 * Note how highest value corresponding to 0x7 is the lowest 35 * current, this is per the datasheet. 36 */ 37 enum rk817_chg_cur { 38 CHG_1A, 39 CHG_1_5A, 40 CHG_2A, 41 CHG_2_5A, 42 CHG_2_75A, 43 CHG_3A, 44 CHG_3_5A, 45 CHG_0_5A, 46 }; 47 48 struct rk817_charger { 49 struct device *dev; 50 struct rk808 *rk808; 51 52 struct power_supply *bat_ps; 53 struct power_supply *chg_ps; 54 bool plugged_in; 55 bool battery_present; 56 57 /* 58 * voltage_k and voltage_b values are used to calibrate the ADC 59 * voltage readings. While they are documented in the BSP kernel and 60 * datasheet as voltage_k and voltage_b, there is no further 61 * information explaining them in more detail. 62 */ 63 64 uint32_t voltage_k; 65 uint32_t voltage_b; 66 67 /* 68 * soc - state of charge - like the BSP this is stored as a percentage, 69 * to the thousandth. BSP has a display state of charge (dsoc) and a 70 * remaining state of charge (rsoc). This value will be used for both 71 * purposes here so we don't do any fancy math to try and "smooth" the 72 * charge and just report it as it is. Note for example an soc of 100 73 * is stored as 100000, an soc of 50 is stored as 50000, etc. 74 */ 75 int soc; 76 77 /* 78 * Capacity of battery when fully charged, equal or less than design 79 * capacity depending upon wear. BSP kernel saves to nvram in mAh, 80 * so this value is in mAh not the standard uAh. 81 */ 82 int fcc_mah; 83 84 /* 85 * Calibrate the SOC on a fully charged battery, this way we can use 86 * the calibrated SOC value to correct for columb counter drift. 87 */ 88 bool soc_cal; 89 90 /* Implementation specific immutable properties from device tree */ 91 int res_div; 92 int sleep_enter_current_ua; 93 int sleep_filter_current_ua; 94 int bat_charge_full_design_uah; 95 int bat_voltage_min_design_uv; 96 int bat_voltage_max_design_uv; 97 98 /* Values updated periodically by driver for display. */ 99 int charge_now_uah; 100 int volt_avg_uv; 101 int cur_avg_ua; 102 int max_chg_cur_ua; 103 int max_chg_volt_uv; 104 int charge_status; 105 int charger_input_volt_avg_uv; 106 107 /* Work queue to periodically update values. */ 108 struct delayed_work work; 109 }; 110 111 /* ADC coefficients extracted from BSP kernel */ 112 #define ADC_TO_CURRENT(adc_value, res_div) \ 113 (adc_value * 172 / res_div) 114 115 #define CURRENT_TO_ADC(current, samp_res) \ 116 (current * samp_res / 172) 117 118 #define CHARGE_TO_ADC(capacity, res_div) \ 119 (capacity * res_div * 3600 / 172 * 1000) 120 121 #define ADC_TO_CHARGE_UAH(adc_value, res_div) \ 122 (adc_value / 3600 * 172 / res_div) 123 124 static int rk817_chg_cur_to_reg(u32 chg_cur_ma) 125 { 126 if (chg_cur_ma >= 3500) 127 return CHG_3_5A; 128 else if (chg_cur_ma >= 3000) 129 return CHG_3A; 130 else if (chg_cur_ma >= 2750) 131 return CHG_2_75A; 132 else if (chg_cur_ma >= 2500) 133 return CHG_2_5A; 134 else if (chg_cur_ma >= 2000) 135 return CHG_2A; 136 else if (chg_cur_ma >= 1500) 137 return CHG_1_5A; 138 else if (chg_cur_ma >= 1000) 139 return CHG_1A; 140 else if (chg_cur_ma >= 500) 141 return CHG_0_5A; 142 else 143 return -EINVAL; 144 } 145 146 static int rk817_chg_cur_from_reg(u8 reg) 147 { 148 switch (reg) { 149 case CHG_0_5A: 150 return 500000; 151 case CHG_1A: 152 return 1000000; 153 case CHG_1_5A: 154 return 1500000; 155 case CHG_2A: 156 return 2000000; 157 case CHG_2_5A: 158 return 2500000; 159 case CHG_2_75A: 160 return 2750000; 161 case CHG_3A: 162 return 3000000; 163 case CHG_3_5A: 164 return 3500000; 165 default: 166 return -EINVAL; 167 } 168 } 169 170 static void rk817_bat_calib_vol(struct rk817_charger *charger) 171 { 172 uint32_t vcalib0 = 0; 173 uint32_t vcalib1 = 0; 174 u8 bulk_reg[2]; 175 176 /* calibrate voltage */ 177 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_VCALIB0_H, 178 bulk_reg, 2); 179 vcalib0 = get_unaligned_be16(bulk_reg); 180 181 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_VCALIB1_H, 182 bulk_reg, 2); 183 vcalib1 = get_unaligned_be16(bulk_reg); 184 185 /* values were taken from BSP kernel */ 186 charger->voltage_k = (4025 - 2300) * 1000 / 187 ((vcalib1 - vcalib0) ? (vcalib1 - vcalib0) : 1); 188 charger->voltage_b = 4025 - (charger->voltage_k * vcalib1) / 1000; 189 } 190 191 static void rk817_bat_calib_cur(struct rk817_charger *charger) 192 { 193 u8 bulk_reg[2]; 194 195 /* calibrate current */ 196 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_IOFFSET_H, 197 bulk_reg, 2); 198 regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_CAL_OFFSET_H, 199 bulk_reg, 2); 200 } 201 202 /* 203 * note that only the fcc_mah is really used by this driver, the other values 204 * are to ensure we can remain backwards compatible with the BSP kernel. 205 */ 206 static int rk817_record_battery_nvram_values(struct rk817_charger *charger) 207 { 208 u8 bulk_reg[3]; 209 int ret, rsoc; 210 211 /* 212 * write the soc value to the nvram location used by the BSP kernel 213 * for the dsoc value. 214 */ 215 put_unaligned_le24(charger->soc, bulk_reg); 216 ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_R1, 217 bulk_reg, 3); 218 if (ret < 0) 219 return ret; 220 /* 221 * write the remaining capacity in mah to the nvram location used by 222 * the BSP kernel for the rsoc value. 223 */ 224 rsoc = (charger->soc * charger->fcc_mah) / 100000; 225 put_unaligned_le24(rsoc, bulk_reg); 226 ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_DATA0, 227 bulk_reg, 3); 228 if (ret < 0) 229 return ret; 230 /* write the fcc_mah in mAh, just as the BSP kernel does. */ 231 put_unaligned_le24(charger->fcc_mah, bulk_reg); 232 ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_DATA3, 233 bulk_reg, 3); 234 if (ret < 0) 235 return ret; 236 237 return 0; 238 } 239 240 static int rk817_bat_calib_cap(struct rk817_charger *charger) 241 { 242 struct rk808 *rk808 = charger->rk808; 243 int tmp, charge_now, charge_now_adc, volt_avg; 244 u8 bulk_reg[4]; 245 246 /* Calibrate the soc and fcc on a fully charged battery */ 247 248 if (charger->charge_status == CHARGE_FINISH && (!charger->soc_cal)) { 249 /* 250 * soc should be 100000 and columb counter should show the full 251 * charge capacity. Note that if the device is unplugged for a 252 * period of several days the columb counter will have a large 253 * margin of error, so setting it back to the full charge on 254 * a completed charge cycle should correct this (my device was 255 * showing 33% battery after 3 days unplugged when it should 256 * have been closer to 95% based on voltage and charge 257 * current). 258 */ 259 260 charger->soc = 100000; 261 charge_now_adc = CHARGE_TO_ADC(charger->fcc_mah, 262 charger->res_div); 263 put_unaligned_be32(charge_now_adc, bulk_reg); 264 regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_INIT_H3, 265 bulk_reg, 4); 266 267 charger->soc_cal = 1; 268 dev_dbg(charger->dev, 269 "Fully charged. SOC is %d, full capacity is %d\n", 270 charger->soc, charger->fcc_mah * 1000); 271 } 272 273 /* 274 * The columb counter can drift up slightly, so we should correct for 275 * it. But don't correct it until we're at 100% soc. 276 */ 277 if (charger->charge_status == CHARGE_FINISH && charger->soc_cal) { 278 regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3, 279 bulk_reg, 4); 280 charge_now_adc = get_unaligned_be32(bulk_reg); 281 if (charge_now_adc < 0) 282 return charge_now_adc; 283 charge_now = ADC_TO_CHARGE_UAH(charge_now_adc, 284 charger->res_div); 285 286 /* 287 * Re-init columb counter with updated values to correct drift. 288 */ 289 if (charge_now / 1000 > charger->fcc_mah) { 290 dev_dbg(charger->dev, 291 "Recalibrating columb counter to %d uah\n", 292 charge_now); 293 /* 294 * Order of operations matters here to ensure we keep 295 * enough precision until the last step to keep from 296 * making needless updates to columb counter. 297 */ 298 charge_now_adc = CHARGE_TO_ADC(charger->fcc_mah, 299 charger->res_div); 300 put_unaligned_be32(charge_now_adc, bulk_reg); 301 regmap_bulk_write(rk808->regmap, 302 RK817_GAS_GAUGE_Q_INIT_H3, 303 bulk_reg, 4); 304 } 305 } 306 307 /* 308 * Calibrate the fully charged capacity when we previously had a full 309 * battery (soc_cal = 1) and are now empty (at or below minimum design 310 * voltage). If our columb counter is still positive, subtract that 311 * from our fcc value to get a calibrated fcc, and if our columb 312 * counter is negative add that to our fcc (but not to exceed our 313 * design capacity). 314 */ 315 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_VOL_H, 316 bulk_reg, 2); 317 tmp = get_unaligned_be16(bulk_reg); 318 volt_avg = (charger->voltage_k * tmp) + 1000 * charger->voltage_b; 319 if (volt_avg <= charger->bat_voltage_min_design_uv && 320 charger->soc_cal) { 321 regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3, 322 bulk_reg, 4); 323 charge_now_adc = get_unaligned_be32(bulk_reg); 324 charge_now = ADC_TO_CHARGE_UAH(charge_now_adc, 325 charger->res_div); 326 /* 327 * Note, if charge_now is negative this will add it (what we 328 * want) and if it's positive this will subtract (also what 329 * we want). 330 */ 331 charger->fcc_mah = charger->fcc_mah - (charge_now / 1000); 332 333 dev_dbg(charger->dev, 334 "Recalibrating full charge capacity to %d uah\n", 335 charger->fcc_mah * 1000); 336 } 337 338 /* 339 * Set the SOC to 0 if we are below the minimum system voltage. 340 */ 341 if (volt_avg <= charger->bat_voltage_min_design_uv) { 342 charger->soc = 0; 343 charge_now_adc = CHARGE_TO_ADC(0, charger->res_div); 344 put_unaligned_be32(charge_now_adc, bulk_reg); 345 regmap_bulk_write(rk808->regmap, 346 RK817_GAS_GAUGE_Q_INIT_H3, bulk_reg, 4); 347 dev_warn(charger->dev, 348 "Battery voltage %d below minimum voltage %d\n", 349 volt_avg, charger->bat_voltage_min_design_uv); 350 } 351 352 rk817_record_battery_nvram_values(charger); 353 354 return 0; 355 } 356 357 static void rk817_read_props(struct rk817_charger *charger) 358 { 359 int tmp, reg; 360 u8 bulk_reg[4]; 361 362 /* 363 * Recalibrate voltage and current readings if we need to BSP does both 364 * on CUR_CALIB_UPD, ignoring VOL_CALIB_UPD. Curiously enough, both 365 * documentation and the BSP show that you perform an update if bit 7 366 * is 1, but you clear the status by writing a 1 to bit 7. 367 */ 368 regmap_read(charger->rk808->regmap, RK817_GAS_GAUGE_ADC_CONFIG1, ®); 369 if (reg & RK817_VOL_CUR_CALIB_UPD) { 370 rk817_bat_calib_cur(charger); 371 rk817_bat_calib_vol(charger); 372 regmap_write_bits(charger->rk808->regmap, 373 RK817_GAS_GAUGE_ADC_CONFIG1, 374 RK817_VOL_CUR_CALIB_UPD, 375 RK817_VOL_CUR_CALIB_UPD); 376 } 377 378 /* Update reported charge. */ 379 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3, 380 bulk_reg, 4); 381 tmp = get_unaligned_be32(bulk_reg); 382 charger->charge_now_uah = ADC_TO_CHARGE_UAH(tmp, charger->res_div); 383 if (charger->charge_now_uah < 0) 384 charger->charge_now_uah = 0; 385 if (charger->charge_now_uah > charger->fcc_mah * 1000) 386 charger->charge_now_uah = charger->fcc_mah * 1000; 387 388 /* Update soc based on reported charge. */ 389 charger->soc = charger->charge_now_uah * 100 / charger->fcc_mah; 390 391 /* Update reported voltage. */ 392 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_VOL_H, 393 bulk_reg, 2); 394 tmp = get_unaligned_be16(bulk_reg); 395 charger->volt_avg_uv = (charger->voltage_k * tmp) + 1000 * 396 charger->voltage_b; 397 398 /* 399 * Update reported current. Note value from registers is a signed 16 400 * bit int. 401 */ 402 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_CUR_H, 403 bulk_reg, 2); 404 tmp = (short int)get_unaligned_be16(bulk_reg); 405 charger->cur_avg_ua = ADC_TO_CURRENT(tmp, charger->res_div); 406 407 /* 408 * Update the max charge current. This value shouldn't change, but we 409 * can read it to report what the PMIC says it is instead of simply 410 * returning the default value. 411 */ 412 regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_OUT, ®); 413 charger->max_chg_cur_ua = 414 rk817_chg_cur_from_reg(reg & RK817_CHRG_CUR_SEL); 415 416 /* 417 * Update max charge voltage. Like the max charge current this value 418 * shouldn't change, but we can report what the PMIC says. 419 */ 420 regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_OUT, ®); 421 charger->max_chg_volt_uv = ((((reg & RK817_CHRG_VOL_SEL) >> 4) * 422 50000) + 4100000); 423 424 /* Check if battery still present. */ 425 regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_STS, ®); 426 charger->battery_present = (reg & RK817_BAT_EXS); 427 428 /* Get which type of charge we are using (if any). */ 429 regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_STS, ®); 430 charger->charge_status = (reg >> 4) & 0x07; 431 432 /* 433 * Get charger input voltage. Note that on my example hardware (an 434 * Odroid Go Advance) the voltage of the power connector is measured 435 * on the register labelled USB in the datasheet; I don't know if this 436 * is how it is designed or just a quirk of the implementation. I 437 * believe this will also measure the voltage of the USB output when in 438 * OTG mode, if that is the case we may need to change this in the 439 * future to return 0 if the power supply status is offline (I can't 440 * test this with my current implementation. Also, when the voltage 441 * should be zero sometimes the ADC still shows a single bit (which 442 * would register as 20000uv). When this happens set it to 0. 443 */ 444 regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_USB_VOL_H, 445 bulk_reg, 2); 446 reg = get_unaligned_be16(bulk_reg); 447 if (reg > 1) { 448 tmp = ((charger->voltage_k * reg / 1000 + charger->voltage_b) * 449 60 / 46); 450 charger->charger_input_volt_avg_uv = tmp * 1000; 451 } else { 452 charger->charger_input_volt_avg_uv = 0; 453 } 454 455 /* Calibrate battery capacity and soc. */ 456 rk817_bat_calib_cap(charger); 457 } 458 459 static int rk817_bat_get_prop(struct power_supply *ps, 460 enum power_supply_property prop, 461 union power_supply_propval *val) 462 { 463 struct rk817_charger *charger = power_supply_get_drvdata(ps); 464 465 switch (prop) { 466 case POWER_SUPPLY_PROP_PRESENT: 467 val->intval = charger->battery_present; 468 break; 469 case POWER_SUPPLY_PROP_STATUS: 470 if (charger->cur_avg_ua < 0) { 471 val->intval = POWER_SUPPLY_STATUS_DISCHARGING; 472 break; 473 } 474 switch (charger->charge_status) { 475 case CHRG_OFF: 476 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; 477 break; 478 /* 479 * Dead charge is documented, but not explained. I never 480 * observed it but assume it's a pre-charge for a dead 481 * battery. 482 */ 483 case DEAD_CHRG: 484 case TRICKLE_CHRG: 485 case CC_OR_CV_CHRG: 486 val->intval = POWER_SUPPLY_STATUS_CHARGING; 487 break; 488 case CHARGE_FINISH: 489 val->intval = POWER_SUPPLY_STATUS_FULL; 490 break; 491 default: 492 val->intval = POWER_SUPPLY_STATUS_UNKNOWN; 493 return -EINVAL; 494 495 } 496 break; 497 case POWER_SUPPLY_PROP_CHARGE_TYPE: 498 switch (charger->charge_status) { 499 case CHRG_OFF: 500 case CHARGE_FINISH: 501 val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE; 502 break; 503 case TRICKLE_CHRG: 504 val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; 505 break; 506 case DEAD_CHRG: 507 case CC_OR_CV_CHRG: 508 val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD; 509 break; 510 default: 511 val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; 512 break; 513 } 514 break; 515 case POWER_SUPPLY_PROP_CHARGE_FULL: 516 val->intval = charger->fcc_mah * 1000; 517 break; 518 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: 519 val->intval = charger->bat_charge_full_design_uah; 520 break; 521 case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN: 522 val->intval = 0; 523 break; 524 case POWER_SUPPLY_PROP_CHARGE_NOW: 525 val->intval = charger->charge_now_uah; 526 break; 527 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 528 val->intval = charger->bat_voltage_min_design_uv; 529 break; 530 case POWER_SUPPLY_PROP_CAPACITY: 531 /* Add 500 so that values like 99999 are 100% not 99%. */ 532 val->intval = (charger->soc + 500) / 1000; 533 if (val->intval > 100) 534 val->intval = 100; 535 if (val->intval < 0) 536 val->intval = 0; 537 break; 538 case POWER_SUPPLY_PROP_VOLTAGE_AVG: 539 val->intval = charger->volt_avg_uv; 540 break; 541 case POWER_SUPPLY_PROP_CURRENT_AVG: 542 val->intval = charger->cur_avg_ua; 543 break; 544 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: 545 val->intval = charger->max_chg_cur_ua; 546 break; 547 case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: 548 val->intval = charger->max_chg_volt_uv; 549 break; 550 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 551 val->intval = charger->bat_voltage_max_design_uv; 552 break; 553 default: 554 return -EINVAL; 555 } 556 return 0; 557 } 558 559 static int rk817_chg_get_prop(struct power_supply *ps, 560 enum power_supply_property prop, 561 union power_supply_propval *val) 562 { 563 struct rk817_charger *charger = power_supply_get_drvdata(ps); 564 565 switch (prop) { 566 case POWER_SUPPLY_PROP_ONLINE: 567 val->intval = charger->plugged_in; 568 break; 569 case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN: 570 /* max voltage from datasheet at 5.5v (default 5.0v) */ 571 val->intval = 5500000; 572 break; 573 case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN: 574 /* min voltage from datasheet at 3.8v (default 5.0v) */ 575 val->intval = 3800000; 576 break; 577 case POWER_SUPPLY_PROP_VOLTAGE_AVG: 578 val->intval = charger->charger_input_volt_avg_uv; 579 break; 580 /* 581 * While it's possible that other implementations could use different 582 * USB types, the current implementation for this PMIC (the Odroid Go 583 * Advance) only uses a dedicated charging port with no rx/tx lines. 584 */ 585 case POWER_SUPPLY_PROP_USB_TYPE: 586 val->intval = POWER_SUPPLY_USB_TYPE_DCP; 587 break; 588 default: 589 return -EINVAL; 590 } 591 return 0; 592 593 } 594 595 static irqreturn_t rk817_plug_in_isr(int irq, void *cg) 596 { 597 struct rk817_charger *charger; 598 599 charger = (struct rk817_charger *)cg; 600 charger->plugged_in = 1; 601 power_supply_changed(charger->chg_ps); 602 power_supply_changed(charger->bat_ps); 603 /* try to recalibrate capacity if we hit full charge. */ 604 charger->soc_cal = 0; 605 606 rk817_read_props(charger); 607 608 dev_dbg(charger->dev, "Power Cord Inserted\n"); 609 610 return IRQ_HANDLED; 611 } 612 613 static irqreturn_t rk817_plug_out_isr(int irq, void *cg) 614 { 615 struct rk817_charger *charger; 616 struct rk808 *rk808; 617 618 charger = (struct rk817_charger *)cg; 619 rk808 = charger->rk808; 620 charger->plugged_in = 0; 621 power_supply_changed(charger->bat_ps); 622 power_supply_changed(charger->chg_ps); 623 624 /* 625 * For some reason the bits of RK817_PMIC_CHRG_IN reset whenever the 626 * power cord is unplugged. This was not documented in the BSP kernel 627 * or the datasheet and only discovered by trial and error. Set minimum 628 * USB input voltage to 4.5v and enable USB voltage input limit. 629 */ 630 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, 631 RK817_USB_VLIM_SEL, (0x05 << 4)); 632 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_VLIM_EN, 633 (0x01 << 7)); 634 635 /* 636 * Set average USB input current limit to 1.5A and enable USB current 637 * input limit. 638 */ 639 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, 640 RK817_USB_ILIM_SEL, 0x03); 641 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN, 642 (0x01 << 3)); 643 644 rk817_read_props(charger); 645 646 dev_dbg(charger->dev, "Power Cord Removed\n"); 647 648 return IRQ_HANDLED; 649 } 650 651 static enum power_supply_property rk817_bat_props[] = { 652 POWER_SUPPLY_PROP_PRESENT, 653 POWER_SUPPLY_PROP_STATUS, 654 POWER_SUPPLY_PROP_CHARGE_TYPE, 655 POWER_SUPPLY_PROP_CHARGE_FULL, 656 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 657 POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN, 658 POWER_SUPPLY_PROP_CHARGE_NOW, 659 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, 660 POWER_SUPPLY_PROP_VOLTAGE_AVG, 661 POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, 662 POWER_SUPPLY_PROP_CURRENT_AVG, 663 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 664 POWER_SUPPLY_PROP_CAPACITY, 665 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 666 }; 667 668 static enum power_supply_property rk817_chg_props[] = { 669 POWER_SUPPLY_PROP_ONLINE, 670 POWER_SUPPLY_PROP_USB_TYPE, 671 POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN, 672 POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN, 673 POWER_SUPPLY_PROP_VOLTAGE_AVG, 674 }; 675 676 static const struct power_supply_desc rk817_bat_desc = { 677 .name = "rk817-battery", 678 .type = POWER_SUPPLY_TYPE_BATTERY, 679 .properties = rk817_bat_props, 680 .num_properties = ARRAY_SIZE(rk817_bat_props), 681 .get_property = rk817_bat_get_prop, 682 }; 683 684 static const struct power_supply_desc rk817_chg_desc = { 685 .name = "rk817-charger", 686 .type = POWER_SUPPLY_TYPE_USB, 687 .usb_types = BIT(POWER_SUPPLY_USB_TYPE_DCP) | 688 BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN), 689 .properties = rk817_chg_props, 690 .num_properties = ARRAY_SIZE(rk817_chg_props), 691 .get_property = rk817_chg_get_prop, 692 }; 693 694 static int rk817_read_battery_nvram_values(struct rk817_charger *charger) 695 { 696 u8 bulk_reg[3]; 697 int ret; 698 699 /* Read the nvram data for full charge capacity. */ 700 ret = regmap_bulk_read(charger->rk808->regmap, 701 RK817_GAS_GAUGE_DATA3, bulk_reg, 3); 702 if (ret < 0) 703 return ret; 704 charger->fcc_mah = get_unaligned_le24(bulk_reg); 705 706 /* 707 * Sanity checking for values equal to zero or less than would be 708 * practical for this device (BSP Kernel assumes 500mAH or less) for 709 * practicality purposes. Also check if the value is too large and 710 * correct it. 711 */ 712 if ((charger->fcc_mah < 500) || 713 ((charger->fcc_mah * 1000) > charger->bat_charge_full_design_uah)) { 714 dev_info(charger->dev, 715 "Invalid NVRAM max charge, setting to %u uAH\n", 716 charger->bat_charge_full_design_uah); 717 charger->fcc_mah = charger->bat_charge_full_design_uah / 1000; 718 } 719 720 /* 721 * Read the nvram for state of charge. Sanity check for values greater 722 * than 100 (10000) or less than 0, because other things (BSP kernels, 723 * U-Boot, or even i2cset) can write to this register. If the value is 724 * off it should get corrected automatically when the voltage drops to 725 * the min (soc is 0) or when the battery is full (soc is 100). 726 */ 727 ret = regmap_bulk_read(charger->rk808->regmap, 728 RK817_GAS_GAUGE_BAT_R1, bulk_reg, 3); 729 if (ret < 0) 730 return ret; 731 charger->soc = get_unaligned_le24(bulk_reg); 732 if (charger->soc > 10000) 733 charger->soc = 10000; 734 if (charger->soc < 0) 735 charger->soc = 0; 736 737 return 0; 738 } 739 740 static int 741 rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger, 742 struct power_supply_battery_info *bat_info) 743 { 744 struct rk808 *rk808 = charger->rk808; 745 u8 bulk_reg[4]; 746 u32 boot_voltage, boot_charge_mah; 747 int ret, reg, off_time, tmp; 748 bool first_boot; 749 750 /* 751 * Check if the battery is uninitalized. If it is, the columb counter 752 * needs to be set up. 753 */ 754 ret = regmap_read(rk808->regmap, RK817_GAS_GAUGE_GG_STS, ®); 755 if (ret < 0) 756 return ret; 757 first_boot = reg & RK817_BAT_CON; 758 /* 759 * If the battery is uninitialized, use the poweron voltage and an ocv 760 * lookup to guess our charge. The number won't be very accurate until 761 * we hit either our minimum voltage (0%) or full charge (100%). 762 */ 763 if (first_boot) { 764 regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_PWRON_VOL_H, 765 bulk_reg, 2); 766 tmp = get_unaligned_be16(bulk_reg); 767 boot_voltage = (charger->voltage_k * tmp) + 768 1000 * charger->voltage_b; 769 /* 770 * Since only implementation has no working thermistor, assume 771 * 20C for OCV lookup. If lookup fails, report error with OCV 772 * table. 773 */ 774 charger->soc = power_supply_batinfo_ocv2cap(bat_info, 775 boot_voltage, 776 20) * 1000; 777 if (charger->soc < 0) 778 charger->soc = 0; 779 780 /* Guess that full charge capacity is the design capacity */ 781 charger->fcc_mah = charger->bat_charge_full_design_uah / 1000; 782 /* 783 * Set battery as "set up". BSP driver uses this value even 784 * though datasheet claims it's a read-only value. 785 */ 786 regmap_write_bits(rk808->regmap, RK817_GAS_GAUGE_GG_STS, 787 RK817_BAT_CON, 0); 788 /* Save nvram values */ 789 ret = rk817_record_battery_nvram_values(charger); 790 if (ret < 0) 791 return ret; 792 } else { 793 ret = rk817_read_battery_nvram_values(charger); 794 if (ret < 0) 795 return ret; 796 797 regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3, 798 bulk_reg, 4); 799 tmp = get_unaligned_be32(bulk_reg); 800 if (tmp < 0) 801 tmp = 0; 802 boot_charge_mah = ADC_TO_CHARGE_UAH(tmp, 803 charger->res_div) / 1000; 804 /* 805 * Check if the columb counter has been off for more than 30 806 * minutes as it tends to drift downward. If so, re-init soc 807 * with the boot voltage instead. Note the unit values for the 808 * OFF_CNT register appear to be in decaminutes and stops 809 * counting at 2550 (0xFF) minutes. BSP kernel used OCV, but 810 * for me occasionally that would show invalid values. Boot 811 * voltage is only accurate for me on first poweron (not 812 * reboots), but we shouldn't ever encounter an OFF_CNT more 813 * than 0 on a reboot anyway. 814 */ 815 regmap_read(rk808->regmap, RK817_GAS_GAUGE_OFF_CNT, &off_time); 816 if (off_time >= 3) { 817 regmap_bulk_read(rk808->regmap, 818 RK817_GAS_GAUGE_PWRON_VOL_H, 819 bulk_reg, 2); 820 tmp = get_unaligned_be16(bulk_reg); 821 boot_voltage = (charger->voltage_k * tmp) + 822 1000 * charger->voltage_b; 823 charger->soc = 824 power_supply_batinfo_ocv2cap(bat_info, 825 boot_voltage, 826 20) * 1000; 827 } else { 828 charger->soc = (boot_charge_mah * 1000 * 100 / 829 charger->fcc_mah); 830 } 831 } 832 833 /* 834 * Now we have our full charge capacity and soc, init the columb 835 * counter. 836 */ 837 boot_charge_mah = charger->soc * charger->fcc_mah / 100 / 1000; 838 if (boot_charge_mah > charger->fcc_mah) 839 boot_charge_mah = charger->fcc_mah; 840 tmp = CHARGE_TO_ADC(boot_charge_mah, charger->res_div); 841 put_unaligned_be32(tmp, bulk_reg); 842 ret = regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_INIT_H3, 843 bulk_reg, 4); 844 if (ret < 0) 845 return ret; 846 847 /* Set QMAX value to max design capacity. */ 848 tmp = CHARGE_TO_ADC((charger->bat_charge_full_design_uah / 1000), 849 charger->res_div); 850 put_unaligned_be32(tmp, bulk_reg); 851 ret = regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_MAX_H3, 852 bulk_reg, 4); 853 if (ret < 0) 854 return ret; 855 856 return 0; 857 } 858 859 static int rk817_battery_init(struct rk817_charger *charger, 860 struct power_supply_battery_info *bat_info) 861 { 862 struct rk808 *rk808 = charger->rk808; 863 u32 tmp, max_chg_vol_mv, max_chg_cur_ma; 864 u8 max_chg_vol_reg, chg_term_i_reg; 865 int ret, chg_term_ma, max_chg_cur_reg; 866 u8 bulk_reg[2]; 867 868 /* Get initial plug state */ 869 regmap_read(rk808->regmap, RK817_SYS_STS, &tmp); 870 charger->plugged_in = (tmp & RK817_PLUG_IN_STS); 871 872 /* 873 * Turn on all ADC functions to measure battery, USB, and sys voltage, 874 * as well as batt temp. Note only tested implementation so far does 875 * not use a battery with a thermistor. 876 */ 877 regmap_write(rk808->regmap, RK817_GAS_GAUGE_ADC_CONFIG0, 0xfc); 878 879 /* 880 * Set relax mode voltage sampling interval and ADC offset calibration 881 * interval to 8 minutes to mirror BSP kernel. Set voltage and current 882 * modes to average to mirror BSP kernel. 883 */ 884 regmap_write(rk808->regmap, RK817_GAS_GAUGE_GG_CON, 0x04); 885 886 /* Calibrate voltage like the BSP does here. */ 887 rk817_bat_calib_vol(charger); 888 889 /* Write relax threshold, derived from sleep enter current. */ 890 tmp = CURRENT_TO_ADC(charger->sleep_enter_current_ua, 891 charger->res_div); 892 put_unaligned_be16(tmp, bulk_reg); 893 regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_RELAX_THRE_H, 894 bulk_reg, 2); 895 896 /* Write sleep sample current, derived from sleep filter current. */ 897 tmp = CURRENT_TO_ADC(charger->sleep_filter_current_ua, 898 charger->res_div); 899 put_unaligned_be16(tmp, bulk_reg); 900 regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_SLEEP_CON_SAMP_CUR_H, 901 bulk_reg, 2); 902 903 /* Restart battery relax voltage */ 904 regmap_write_bits(rk808->regmap, RK817_GAS_GAUGE_GG_STS, 905 RK817_RELAX_VOL_UPD, (0x0 << 2)); 906 907 /* 908 * Set OCV Threshold Voltage to 127.5mV. This was hard coded like this 909 * in the BSP. 910 */ 911 regmap_write(rk808->regmap, RK817_GAS_GAUGE_OCV_THRE_VOL, 0xff); 912 913 /* 914 * Set maximum charging voltage to battery max voltage. Trying to be 915 * incredibly safe with these value, as setting them wrong could 916 * overcharge the battery, which would be very bad. 917 */ 918 max_chg_vol_mv = bat_info->constant_charge_voltage_max_uv / 1000; 919 max_chg_cur_ma = bat_info->constant_charge_current_max_ua / 1000; 920 921 if (max_chg_vol_mv < 4100) { 922 return dev_err_probe(charger->dev, -EINVAL, 923 "invalid max charger voltage, value %u unsupported\n", 924 max_chg_vol_mv * 1000); 925 } 926 if (max_chg_vol_mv > 4450) { 927 dev_info(charger->dev, 928 "Setting max charge voltage to 4450000uv\n"); 929 max_chg_vol_mv = 4450; 930 } 931 932 if (max_chg_cur_ma < 500) { 933 return dev_err_probe(charger->dev, -EINVAL, 934 "invalid max charger current, value %u unsupported\n", 935 max_chg_cur_ma * 1000); 936 } 937 if (max_chg_cur_ma > 3500) 938 dev_info(charger->dev, 939 "Setting max charge current to 3500000ua\n"); 940 941 /* 942 * Now that the values are sanity checked, if we subtract 4100 from the 943 * max voltage and divide by 50, we conviently get the exact value for 944 * the registers, which are 4.1v, 4.15v, 4.2v, 4.25v, 4.3v, 4.35v, 945 * 4.4v, and 4.45v; these correspond to values 0x00 through 0x07. 946 */ 947 max_chg_vol_reg = (max_chg_vol_mv - 4100) / 50; 948 949 max_chg_cur_reg = rk817_chg_cur_to_reg(max_chg_cur_ma); 950 951 if (max_chg_vol_reg < 0 || max_chg_vol_reg > 7) { 952 return dev_err_probe(charger->dev, -EINVAL, 953 "invalid max charger voltage, value %u unsupported\n", 954 max_chg_vol_mv * 1000); 955 } 956 if (max_chg_cur_reg < 0 || max_chg_cur_reg > 7) { 957 return dev_err_probe(charger->dev, -EINVAL, 958 "invalid max charger current, value %u unsupported\n", 959 max_chg_cur_ma * 1000); 960 } 961 962 /* 963 * Write the values to the registers, and deliver an emergency warning 964 * in the event they are not written correctly. 965 */ 966 ret = regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_OUT, 967 RK817_CHRG_VOL_SEL, (max_chg_vol_reg << 4)); 968 if (ret) { 969 dev_emerg(charger->dev, 970 "Danger, unable to set max charger voltage: %u\n", 971 ret); 972 } 973 974 ret = regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_OUT, 975 RK817_CHRG_CUR_SEL, max_chg_cur_reg); 976 if (ret) { 977 dev_emerg(charger->dev, 978 "Danger, unable to set max charger current: %u\n", 979 ret); 980 } 981 982 /* Set charge finishing mode to analog */ 983 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_TERM, 984 RK817_CHRG_TERM_ANA_DIG, (0x0 << 2)); 985 986 /* 987 * Set charge finish current, warn if value not in range and keep 988 * default. 989 */ 990 chg_term_ma = bat_info->charge_term_current_ua / 1000; 991 if (chg_term_ma < 150 || chg_term_ma > 400) { 992 dev_warn(charger->dev, 993 "Invalid charge termination %u, keeping default\n", 994 chg_term_ma * 1000); 995 chg_term_ma = 200; 996 } 997 998 /* 999 * Values of 150ma, 200ma, 300ma, and 400ma correspond to 00, 01, 10, 1000 * and 11. 1001 */ 1002 chg_term_i_reg = (chg_term_ma - 100) / 100; 1003 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_TERM, 1004 RK817_CHRG_TERM_ANA_SEL, chg_term_i_reg); 1005 1006 ret = rk817_read_or_set_full_charge_on_boot(charger, bat_info); 1007 if (ret < 0) 1008 return ret; 1009 1010 /* 1011 * Set minimum USB input voltage to 4.5v and enable USB voltage input 1012 * limit. 1013 */ 1014 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, 1015 RK817_USB_VLIM_SEL, (0x05 << 4)); 1016 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_VLIM_EN, 1017 (0x01 << 7)); 1018 1019 /* 1020 * Set average USB input current limit to 1.5A and enable USB current 1021 * input limit. 1022 */ 1023 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, 1024 RK817_USB_ILIM_SEL, 0x03); 1025 regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN, 1026 (0x01 << 3)); 1027 1028 return 0; 1029 } 1030 1031 static void rk817_charging_monitor(struct work_struct *work) 1032 { 1033 struct rk817_charger *charger; 1034 1035 charger = container_of(work, struct rk817_charger, work.work); 1036 1037 rk817_read_props(charger); 1038 1039 /* Run every 8 seconds like the BSP driver did. */ 1040 queue_delayed_work(system_wq, &charger->work, msecs_to_jiffies(8000)); 1041 } 1042 1043 static void rk817_cleanup_node(void *data) 1044 { 1045 struct device_node *node = data; 1046 1047 of_node_put(node); 1048 } 1049 1050 static int rk817_charger_probe(struct platform_device *pdev) 1051 { 1052 struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent); 1053 struct rk817_charger *charger; 1054 struct device_node *node; 1055 struct power_supply_battery_info *bat_info; 1056 struct device *dev = &pdev->dev; 1057 struct power_supply_config pscfg = {}; 1058 int plugin_irq, plugout_irq; 1059 int of_value; 1060 int ret; 1061 1062 node = of_get_child_by_name(dev->parent->of_node, "charger"); 1063 if (!node) 1064 return -ENODEV; 1065 1066 ret = devm_add_action_or_reset(&pdev->dev, rk817_cleanup_node, node); 1067 if (ret) 1068 return ret; 1069 1070 charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); 1071 if (!charger) 1072 return -ENOMEM; 1073 1074 charger->rk808 = rk808; 1075 1076 charger->dev = &pdev->dev; 1077 platform_set_drvdata(pdev, charger); 1078 1079 rk817_bat_calib_vol(charger); 1080 1081 pscfg.drv_data = charger; 1082 pscfg.of_node = node; 1083 1084 /* 1085 * Get sample resistor value. Note only values of 10000 or 20000 1086 * microohms are allowed. Schematic for my test implementation (an 1087 * Odroid Go Advance) shows a 10 milliohm resistor for reference. 1088 */ 1089 ret = of_property_read_u32(node, "rockchip,resistor-sense-micro-ohms", 1090 &of_value); 1091 if (ret < 0) { 1092 return dev_err_probe(dev, ret, 1093 "Error reading sample resistor value\n"); 1094 } 1095 /* 1096 * Store as a 1 or a 2, since all we really use the value for is as a 1097 * divisor in some calculations. 1098 */ 1099 charger->res_div = (of_value == 20000) ? 2 : 1; 1100 1101 /* 1102 * Get sleep enter current value. Not sure what this value is for 1103 * other than to help calibrate the relax threshold. 1104 */ 1105 ret = of_property_read_u32(node, 1106 "rockchip,sleep-enter-current-microamp", 1107 &of_value); 1108 if (ret < 0) { 1109 return dev_err_probe(dev, ret, 1110 "Error reading sleep enter cur value\n"); 1111 } 1112 charger->sleep_enter_current_ua = of_value; 1113 1114 /* Get sleep filter current value */ 1115 ret = of_property_read_u32(node, 1116 "rockchip,sleep-filter-current-microamp", 1117 &of_value); 1118 if (ret < 0) { 1119 return dev_err_probe(dev, ret, 1120 "Error reading sleep filter cur value\n"); 1121 } 1122 1123 charger->sleep_filter_current_ua = of_value; 1124 1125 charger->bat_ps = devm_power_supply_register(&pdev->dev, 1126 &rk817_bat_desc, &pscfg); 1127 if (IS_ERR(charger->bat_ps)) 1128 return dev_err_probe(dev, -EINVAL, 1129 "Battery failed to probe\n"); 1130 1131 charger->chg_ps = devm_power_supply_register(&pdev->dev, 1132 &rk817_chg_desc, &pscfg); 1133 if (IS_ERR(charger->chg_ps)) 1134 return dev_err_probe(dev, -EINVAL, 1135 "Charger failed to probe\n"); 1136 1137 ret = power_supply_get_battery_info(charger->bat_ps, 1138 &bat_info); 1139 if (ret) { 1140 return dev_err_probe(dev, ret, 1141 "Unable to get battery info\n"); 1142 } 1143 1144 if ((bat_info->charge_full_design_uah <= 0) || 1145 (bat_info->voltage_min_design_uv <= 0) || 1146 (bat_info->voltage_max_design_uv <= 0) || 1147 (bat_info->constant_charge_voltage_max_uv <= 0) || 1148 (bat_info->constant_charge_current_max_ua <= 0) || 1149 (bat_info->charge_term_current_ua <= 0)) { 1150 return dev_err_probe(dev, -EINVAL, 1151 "Required bat info missing or invalid\n"); 1152 } 1153 1154 charger->bat_charge_full_design_uah = bat_info->charge_full_design_uah; 1155 charger->bat_voltage_min_design_uv = bat_info->voltage_min_design_uv; 1156 charger->bat_voltage_max_design_uv = bat_info->voltage_max_design_uv; 1157 1158 /* 1159 * Has to run after power_supply_get_battery_info as it depends on some 1160 * values discovered from that routine. 1161 */ 1162 ret = rk817_battery_init(charger, bat_info); 1163 if (ret) 1164 return ret; 1165 1166 power_supply_put_battery_info(charger->bat_ps, bat_info); 1167 1168 plugin_irq = platform_get_irq(pdev, 0); 1169 if (plugin_irq < 0) 1170 return plugin_irq; 1171 1172 plugout_irq = platform_get_irq(pdev, 1); 1173 if (plugout_irq < 0) 1174 return plugout_irq; 1175 1176 ret = devm_request_threaded_irq(charger->dev, plugin_irq, NULL, 1177 rk817_plug_in_isr, 1178 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 1179 "rk817_plug_in", charger); 1180 if (ret) { 1181 return dev_err_probe(&pdev->dev, ret, 1182 "plug_in_irq request failed!\n"); 1183 } 1184 1185 ret = devm_request_threaded_irq(charger->dev, plugout_irq, NULL, 1186 rk817_plug_out_isr, 1187 IRQF_TRIGGER_RISING | IRQF_ONESHOT, 1188 "rk817_plug_out", charger); 1189 if (ret) { 1190 return dev_err_probe(&pdev->dev, ret, 1191 "plug_out_irq request failed!\n"); 1192 } 1193 1194 ret = devm_delayed_work_autocancel(&pdev->dev, &charger->work, 1195 rk817_charging_monitor); 1196 if (ret) 1197 return ret; 1198 1199 /* Force the first update immediately. */ 1200 mod_delayed_work(system_wq, &charger->work, 0); 1201 1202 return 0; 1203 } 1204 1205 static int __maybe_unused rk817_resume(struct device *dev) 1206 { 1207 1208 struct rk817_charger *charger = dev_get_drvdata(dev); 1209 1210 /* force an immediate update */ 1211 mod_delayed_work(system_wq, &charger->work, 0); 1212 1213 return 0; 1214 } 1215 1216 static SIMPLE_DEV_PM_OPS(rk817_charger_pm, NULL, rk817_resume); 1217 1218 static struct platform_driver rk817_charger_driver = { 1219 .probe = rk817_charger_probe, 1220 .driver = { 1221 .name = "rk817-charger", 1222 .pm = &rk817_charger_pm, 1223 }, 1224 }; 1225 module_platform_driver(rk817_charger_driver); 1226 1227 MODULE_DESCRIPTION("Battery power supply driver for RK817 PMIC"); 1228 MODULE_AUTHOR("Maya Matuszczyk <maccraft123mc@gmail.com>"); 1229 MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>"); 1230 MODULE_LICENSE("GPL"); 1231 MODULE_ALIAS("platform:rk817-charger"); 1232