drivers/power/supply/rk817_charger.c

   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 <asm/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, &reg);
 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, &reg);
 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, &reg);
 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, &reg);
 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, &reg);
 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 enum power_supply_usb_type rk817_usb_type[] = {
 677         POWER_SUPPLY_USB_TYPE_DCP,
 678         POWER_SUPPLY_USB_TYPE_UNKNOWN,
 679 };
 680
 681 static const struct power_supply_desc rk817_bat_desc = {
 682         .name = "rk817-battery",
 683         .type = POWER_SUPPLY_TYPE_BATTERY,
 684         .properties = rk817_bat_props,
 685         .num_properties = ARRAY_SIZE(rk817_bat_props),
 686         .get_property = rk817_bat_get_prop,
 687 };
 688
 689 static const struct power_supply_desc rk817_chg_desc = {
 690         .name = "rk817-charger",
 691         .type = POWER_SUPPLY_TYPE_USB,
 692         .usb_types = rk817_usb_type,
 693         .num_usb_types = ARRAY_SIZE(rk817_usb_type),
 694         .properties = rk817_chg_props,
 695         .num_properties = ARRAY_SIZE(rk817_chg_props),
 696         .get_property = rk817_chg_get_prop,
 697 };
 698
 699 static int rk817_read_battery_nvram_values(struct rk817_charger *charger)
 700 {
 701         u8 bulk_reg[3];
 702         int ret;
 703
 704         /* Read the nvram data for full charge capacity. */
 705         ret = regmap_bulk_read(charger->rk808->regmap,
 706                                RK817_GAS_GAUGE_DATA3, bulk_reg, 3);
 707         if (ret < 0)
 708                 return ret;
 709         charger->fcc_mah = get_unaligned_le24(bulk_reg);
 710
 711         /*
 712          * Sanity checking for values equal to zero or less than would be
 713          * practical for this device (BSP Kernel assumes 500mAH or less) for
 714          * practicality purposes. Also check if the value is too large and
 715          * correct it.
 716          */
 717         if ((charger->fcc_mah < 500) ||
 718            ((charger->fcc_mah * 1000) > charger->bat_charge_full_design_uah)) {
 719                 dev_info(charger->dev,
 720                          "Invalid NVRAM max charge, setting to %u uAH\n",
 721                          charger->bat_charge_full_design_uah);
 722                 charger->fcc_mah = charger->bat_charge_full_design_uah / 1000;
 723         }
 724
 725         /*
 726          * Read the nvram for state of charge. Sanity check for values greater
 727          * than 100 (10000) or less than 0, because other things (BSP kernels,
 728          * U-Boot, or even i2cset) can write to this register. If the value is
 729          * off it should get corrected automatically when the voltage drops to
 730          * the min (soc is 0) or when the battery is full (soc is 100).
 731          */
 732         ret = regmap_bulk_read(charger->rk808->regmap,
 733                                RK817_GAS_GAUGE_BAT_R1, bulk_reg, 3);
 734         if (ret < 0)
 735                 return ret;
 736         charger->soc = get_unaligned_le24(bulk_reg);
 737         if (charger->soc > 10000)
 738                 charger->soc = 10000;
 739         if (charger->soc < 0)
 740                 charger->soc = 0;
 741
 742         return 0;
 743 }
 744
 745 static int
 746 rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger,
 747                                 struct power_supply_battery_info *bat_info)
 748 {
 749         struct rk808 *rk808 = charger->rk808;
 750         u8 bulk_reg[4];
 751         u32 boot_voltage, boot_charge_mah;
 752         int ret, reg, off_time, tmp;
 753         bool first_boot;
 754
 755         /*
 756          * Check if the battery is uninitalized. If it is, the columb counter
 757          * needs to be set up.
 758          */
 759         ret = regmap_read(rk808->regmap, RK817_GAS_GAUGE_GG_STS, &reg);
 760         if (ret < 0)
 761                 return ret;
 762         first_boot = reg & RK817_BAT_CON;
 763         /*
 764          * If the battery is uninitialized, use the poweron voltage and an ocv
 765          * lookup to guess our charge. The number won't be very accurate until
 766          * we hit either our minimum voltage (0%) or full charge (100%).
 767          */
 768         if (first_boot) {
 769                 regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_PWRON_VOL_H,
 770                                  bulk_reg, 2);
 771                 tmp = get_unaligned_be16(bulk_reg);
 772                 boot_voltage = (charger->voltage_k * tmp) +
 773                                 1000 * charger->voltage_b;
 774                 /*
 775                  * Since only implementation has no working thermistor, assume
 776                  * 20C for OCV lookup. If lookup fails, report error with OCV
 777                  * table.
 778                  */
 779                 charger->soc = power_supply_batinfo_ocv2cap(bat_info,
 780                                                             boot_voltage,
 781                                                             20) * 1000;
 782                 if (charger->soc < 0)
 783                         charger->soc = 0;
 784
 785                 /* Guess that full charge capacity is the design capacity */
 786                 charger->fcc_mah = charger->bat_charge_full_design_uah / 1000;
 787                 /*
 788                  * Set battery as "set up". BSP driver uses this value even
 789                  * though datasheet claims it's a read-only value.
 790                  */
 791                 regmap_write_bits(rk808->regmap, RK817_GAS_GAUGE_GG_STS,
 792                                   RK817_BAT_CON, 0);
 793                 /* Save nvram values */
 794                 ret = rk817_record_battery_nvram_values(charger);
 795                 if (ret < 0)
 796                         return ret;
 797         } else {
 798                 ret = rk817_read_battery_nvram_values(charger);
 799                 if (ret < 0)
 800                         return ret;
 801
 802                 regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
 803                                  bulk_reg, 4);
 804                 tmp = get_unaligned_be32(bulk_reg);
 805                 if (tmp < 0)
 806                         tmp = 0;
 807                 boot_charge_mah = ADC_TO_CHARGE_UAH(tmp,
 808                                                     charger->res_div) / 1000;
 809                 /*
 810                  * Check if the columb counter has been off for more than 30
 811                  * minutes as it tends to drift downward. If so, re-init soc
 812                  * with the boot voltage instead. Note the unit values for the
 813                  * OFF_CNT register appear to be in decaminutes and stops
 814                  * counting at 2550 (0xFF) minutes. BSP kernel used OCV, but
 815                  * for me occasionally that would show invalid values. Boot
 816                  * voltage is only accurate for me on first poweron (not
 817                  * reboots), but we shouldn't ever encounter an OFF_CNT more
 818                  * than 0 on a reboot anyway.
 819                  */
 820                 regmap_read(rk808->regmap, RK817_GAS_GAUGE_OFF_CNT, &off_time);
 821                 if (off_time >= 3) {
 822                         regmap_bulk_read(rk808->regmap,
 823                                          RK817_GAS_GAUGE_PWRON_VOL_H,
 824                                          bulk_reg, 2);
 825                         tmp = get_unaligned_be16(bulk_reg);
 826                         boot_voltage = (charger->voltage_k * tmp) +
 827                                         1000 * charger->voltage_b;
 828                         charger->soc =
 829                                 power_supply_batinfo_ocv2cap(bat_info,
 830                                                              boot_voltage,
 831                                                              20) * 1000;
 832                 } else {
 833                         charger->soc = (boot_charge_mah * 1000 * 100 /
 834                                         charger->fcc_mah);
 835                 }
 836         }
 837
 838         /*
 839          * Now we have our full charge capacity and soc, init the columb
 840          * counter.
 841          */
 842         boot_charge_mah = charger->soc * charger->fcc_mah / 100 / 1000;
 843         if (boot_charge_mah > charger->fcc_mah)
 844                 boot_charge_mah = charger->fcc_mah;
 845         tmp = CHARGE_TO_ADC(boot_charge_mah, charger->res_div);
 846         put_unaligned_be32(tmp, bulk_reg);
 847         ret = regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_INIT_H3,
 848                           bulk_reg, 4);
 849         if (ret < 0)
 850                 return ret;
 851
 852         /* Set QMAX value to max design capacity. */
 853         tmp = CHARGE_TO_ADC((charger->bat_charge_full_design_uah / 1000),
 854                             charger->res_div);
 855         put_unaligned_be32(tmp, bulk_reg);
 856         ret = regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_MAX_H3,
 857                                 bulk_reg, 4);
 858         if (ret < 0)
 859                 return ret;
 860
 861         return 0;
 862 }
 863
 864 static int rk817_battery_init(struct rk817_charger *charger,
 865                               struct power_supply_battery_info *bat_info)
 866 {
 867         struct rk808 *rk808 = charger->rk808;
 868         u32 tmp, max_chg_vol_mv, max_chg_cur_ma;
 869         u8 max_chg_vol_reg, chg_term_i_reg;
 870         int ret, chg_term_ma, max_chg_cur_reg;
 871         u8 bulk_reg[2];
 872
 873         /* Get initial plug state */
 874         regmap_read(rk808->regmap, RK817_SYS_STS, &tmp);
 875         charger->plugged_in = (tmp & RK817_PLUG_IN_STS);
 876
 877         /*
 878          * Turn on all ADC functions to measure battery, USB, and sys voltage,
 879          * as well as batt temp. Note only tested implementation so far does
 880          * not use a battery with a thermistor.
 881          */
 882         regmap_write(rk808->regmap, RK817_GAS_GAUGE_ADC_CONFIG0, 0xfc);
 883
 884         /*
 885          * Set relax mode voltage sampling interval and ADC offset calibration
 886          * interval to 8 minutes to mirror BSP kernel. Set voltage and current
 887          * modes to average to mirror BSP kernel.
 888          */
 889         regmap_write(rk808->regmap, RK817_GAS_GAUGE_GG_CON, 0x04);
 890
 891         /* Calibrate voltage like the BSP does here. */
 892         rk817_bat_calib_vol(charger);
 893
 894         /* Write relax threshold, derived from sleep enter current. */
 895         tmp = CURRENT_TO_ADC(charger->sleep_enter_current_ua,
 896                              charger->res_div);
 897         put_unaligned_be16(tmp, bulk_reg);
 898         regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_RELAX_THRE_H,
 899                           bulk_reg, 2);
 900
 901         /* Write sleep sample current, derived from sleep filter current. */
 902         tmp = CURRENT_TO_ADC(charger->sleep_filter_current_ua,
 903                              charger->res_div);
 904         put_unaligned_be16(tmp, bulk_reg);
 905         regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_SLEEP_CON_SAMP_CUR_H,
 906                           bulk_reg, 2);
 907
 908         /* Restart battery relax voltage */
 909         regmap_write_bits(rk808->regmap, RK817_GAS_GAUGE_GG_STS,
 910                           RK817_RELAX_VOL_UPD, (0x0 << 2));
 911
 912         /*
 913          * Set OCV Threshold Voltage to 127.5mV. This was hard coded like this
 914          * in the BSP.
 915          */
 916         regmap_write(rk808->regmap, RK817_GAS_GAUGE_OCV_THRE_VOL, 0xff);
 917
 918         /*
 919          * Set maximum charging voltage to battery max voltage. Trying to be
 920          * incredibly safe with these value, as setting them wrong could
 921          * overcharge the battery, which would be very bad.
 922          */
 923         max_chg_vol_mv = bat_info->constant_charge_voltage_max_uv / 1000;
 924         max_chg_cur_ma = bat_info->constant_charge_current_max_ua / 1000;
 925
 926         if (max_chg_vol_mv < 4100) {
 927                 return dev_err_probe(charger->dev, -EINVAL,
 928                        "invalid max charger voltage, value %u unsupported\n",
 929                         max_chg_vol_mv * 1000);
 930         }
 931         if (max_chg_vol_mv > 4450) {
 932                 dev_info(charger->dev,
 933                          "Setting max charge voltage to 4450000uv\n");
 934                 max_chg_vol_mv = 4450;
 935         }
 936
 937         if (max_chg_cur_ma < 500) {
 938                 return dev_err_probe(charger->dev, -EINVAL,
 939                        "invalid max charger current, value %u unsupported\n",
 940                        max_chg_cur_ma * 1000);
 941         }
 942         if (max_chg_cur_ma > 3500)
 943                 dev_info(charger->dev,
 944                          "Setting max charge current to 3500000ua\n");
 945
 946         /*
 947          * Now that the values are sanity checked, if we subtract 4100 from the
 948          * max voltage and divide by 50, we conviently get the exact value for
 949          * the registers, which are 4.1v, 4.15v, 4.2v, 4.25v, 4.3v, 4.35v,
 950          * 4.4v, and 4.45v; these correspond to values 0x00 through 0x07.
 951          */
 952         max_chg_vol_reg = (max_chg_vol_mv - 4100) / 50;
 953
 954         max_chg_cur_reg = rk817_chg_cur_to_reg(max_chg_cur_ma);
 955
 956         if (max_chg_vol_reg < 0 || max_chg_vol_reg > 7) {
 957                 return dev_err_probe(charger->dev, -EINVAL,
 958                        "invalid max charger voltage, value %u unsupported\n",
 959                        max_chg_vol_mv * 1000);
 960         }
 961         if (max_chg_cur_reg < 0 || max_chg_cur_reg > 7) {
 962                 return dev_err_probe(charger->dev, -EINVAL,
 963                        "invalid max charger current, value %u unsupported\n",
 964                        max_chg_cur_ma * 1000);
 965         }
 966
 967         /*
 968          * Write the values to the registers, and deliver an emergency warning
 969          * in the event they are not written correctly.
 970          */
 971         ret = regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_OUT,
 972                                 RK817_CHRG_VOL_SEL, (max_chg_vol_reg << 4));
 973         if (ret) {
 974                 dev_emerg(charger->dev,
 975                           "Danger, unable to set max charger voltage: %u\n",
 976                           ret);
 977         }
 978
 979         ret = regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_OUT,
 980                                 RK817_CHRG_CUR_SEL, max_chg_cur_reg);
 981         if (ret) {
 982                 dev_emerg(charger->dev,
 983                           "Danger, unable to set max charger current: %u\n",
 984                           ret);
 985         }
 986
 987         /* Set charge finishing mode to analog */
 988         regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_TERM,
 989                           RK817_CHRG_TERM_ANA_DIG, (0x0 << 2));
 990
 991         /*
 992          * Set charge finish current, warn if value not in range and keep
 993          * default.
 994          */
 995         chg_term_ma = bat_info->charge_term_current_ua / 1000;
 996         if (chg_term_ma < 150 || chg_term_ma > 400) {
 997                 dev_warn(charger->dev,
 998                          "Invalid charge termination %u, keeping default\n",
 999                          chg_term_ma * 1000);
1000                 chg_term_ma = 200;
1001         }
1002
1003         /*
1004          * Values of 150ma, 200ma, 300ma, and 400ma correspond to 00, 01, 10,
1005          * and 11.
1006          */
1007         chg_term_i_reg = (chg_term_ma - 100) / 100;
1008         regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_TERM,
1009                           RK817_CHRG_TERM_ANA_SEL, chg_term_i_reg);
1010
1011         ret = rk817_read_or_set_full_charge_on_boot(charger, bat_info);
1012         if (ret < 0)
1013                 return ret;
1014
1015         /*
1016          * Set minimum USB input voltage to 4.5v and enable USB voltage input
1017          * limit.
1018          */
1019         regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
1020                           RK817_USB_VLIM_SEL, (0x05 << 4));
1021         regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_VLIM_EN,
1022                           (0x01 << 7));
1023
1024         /*
1025          * Set average USB input current limit to 1.5A and enable USB current
1026          * input limit.
1027          */
1028         regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
1029                           RK817_USB_ILIM_SEL, 0x03);
1030         regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN,
1031                           (0x01 << 3));
1032
1033         return 0;
1034 }
1035
1036 static void rk817_charging_monitor(struct work_struct *work)
1037 {
1038         struct rk817_charger *charger;
1039
1040         charger = container_of(work, struct rk817_charger, work.work);
1041
1042         rk817_read_props(charger);
1043
1044         /* Run every 8 seconds like the BSP driver did. */
1045         queue_delayed_work(system_wq, &charger->work, msecs_to_jiffies(8000));
1046 }
1047
1048 static void rk817_cleanup_node(void *data)
1049 {
1050         struct device_node *node = data;
1051
1052         of_node_put(node);
1053 }
1054
1055 static int rk817_charger_probe(struct platform_device *pdev)
1056 {
1057         struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
1058         struct rk817_charger *charger;
1059         struct device_node *node;
1060         struct power_supply_battery_info *bat_info;
1061         struct device *dev = &pdev->dev;
1062         struct power_supply_config pscfg = {};
1063         int plugin_irq, plugout_irq;
1064         int of_value;
1065         int ret;
1066
1067         node = of_get_child_by_name(dev->parent->of_node, "charger");
1068         if (!node)
1069                 return -ENODEV;
1070
1071         ret = devm_add_action_or_reset(&pdev->dev, rk817_cleanup_node, node);
1072         if (ret)
1073                 return ret;
1074
1075         charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
1076         if (!charger)
1077                 return -ENOMEM;
1078
1079         charger->rk808 = rk808;
1080
1081         charger->dev = &pdev->dev;
1082         platform_set_drvdata(pdev, charger);
1083
1084         rk817_bat_calib_vol(charger);
1085
1086         pscfg.drv_data = charger;
1087         pscfg.of_node = node;
1088
1089         /*
1090          * Get sample resistor value. Note only values of 10000 or 20000
1091          * microohms are allowed. Schematic for my test implementation (an
1092          * Odroid Go Advance) shows a 10 milliohm resistor for reference.
1093          */
1094         ret = of_property_read_u32(node, "rockchip,resistor-sense-micro-ohms",
1095                                    &of_value);
1096         if (ret < 0) {
1097                 return dev_err_probe(dev, ret,
1098                                      "Error reading sample resistor value\n");
1099         }
1100         /*
1101          * Store as a 1 or a 2, since all we really use the value for is as a
1102          * divisor in some calculations.
1103          */
1104         charger->res_div = (of_value == 20000) ? 2 : 1;
1105
1106         /*
1107          * Get sleep enter current value. Not sure what this value is for
1108          * other than to help calibrate the relax threshold.
1109          */
1110         ret = of_property_read_u32(node,
1111                                    "rockchip,sleep-enter-current-microamp",
1112                                    &of_value);
1113         if (ret < 0) {
1114                 return dev_err_probe(dev, ret,
1115                                      "Error reading sleep enter cur value\n");
1116         }
1117         charger->sleep_enter_current_ua = of_value;
1118
1119         /* Get sleep filter current value */
1120         ret = of_property_read_u32(node,
1121                                    "rockchip,sleep-filter-current-microamp",
1122                                    &of_value);
1123         if (ret < 0) {
1124                 return dev_err_probe(dev, ret,
1125                                      "Error reading sleep filter cur value\n");
1126         }
1127
1128         charger->sleep_filter_current_ua = of_value;
1129
1130         charger->bat_ps = devm_power_supply_register(&pdev->dev,
1131                                                      &rk817_bat_desc, &pscfg);
1132         if (IS_ERR(charger->bat_ps))
1133                 return dev_err_probe(dev, -EINVAL,
1134                                      "Battery failed to probe\n");
1135
1136         charger->chg_ps = devm_power_supply_register(&pdev->dev,
1137                                                      &rk817_chg_desc, &pscfg);
1138         if (IS_ERR(charger->chg_ps))
1139                 return dev_err_probe(dev, -EINVAL,
1140                                      "Charger failed to probe\n");
1141
1142         ret = power_supply_get_battery_info(charger->bat_ps,
1143                                             &bat_info);
1144         if (ret) {
1145                 return dev_err_probe(dev, ret,
1146                                      "Unable to get battery info\n");
1147         }
1148
1149         if ((bat_info->charge_full_design_uah <= 0) ||
1150             (bat_info->voltage_min_design_uv <= 0) ||
1151             (bat_info->voltage_max_design_uv <= 0) ||
1152             (bat_info->constant_charge_voltage_max_uv <= 0) ||
1153             (bat_info->constant_charge_current_max_ua <= 0) ||
1154             (bat_info->charge_term_current_ua <= 0)) {
1155                 return dev_err_probe(dev, -EINVAL,
1156                                      "Required bat info missing or invalid\n");
1157         }
1158
1159         charger->bat_charge_full_design_uah = bat_info->charge_full_design_uah;
1160         charger->bat_voltage_min_design_uv = bat_info->voltage_min_design_uv;
1161         charger->bat_voltage_max_design_uv = bat_info->voltage_max_design_uv;
1162
1163         /*
1164          * Has to run after power_supply_get_battery_info as it depends on some
1165          * values discovered from that routine.
1166          */
1167         ret = rk817_battery_init(charger, bat_info);
1168         if (ret)
1169                 return ret;
1170
1171         power_supply_put_battery_info(charger->bat_ps, bat_info);
1172
1173         plugin_irq = platform_get_irq(pdev, 0);
1174         if (plugin_irq < 0)
1175                 return plugin_irq;
1176
1177         plugout_irq = platform_get_irq(pdev, 1);
1178         if (plugout_irq < 0)
1179                 return plugout_irq;
1180
1181         ret = devm_request_threaded_irq(charger->dev, plugin_irq, NULL,
1182                                         rk817_plug_in_isr,
1183                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1184                                         "rk817_plug_in", charger);
1185         if (ret) {
1186                 return dev_err_probe(&pdev->dev, ret,
1187                                       "plug_in_irq request failed!\n");
1188         }
1189
1190         ret = devm_request_threaded_irq(charger->dev, plugout_irq, NULL,
1191                                         rk817_plug_out_isr,
1192                                         IRQF_TRIGGER_RISING | IRQF_ONESHOT,
1193                                         "rk817_plug_out", charger);
1194         if (ret) {
1195                 return dev_err_probe(&pdev->dev, ret,
1196                                      "plug_out_irq request failed!\n");
1197         }
1198
1199         ret = devm_delayed_work_autocancel(&pdev->dev, &charger->work,
1200                                            rk817_charging_monitor);
1201         if (ret)
1202                 return ret;
1203
1204         /* Force the first update immediately. */
1205         mod_delayed_work(system_wq, &charger->work, 0);
1206
1207         return 0;
1208 }
1209
1210 static int __maybe_unused rk817_resume(struct device *dev)
1211 {
1212
1213         struct rk817_charger *charger = dev_get_drvdata(dev);
1214
1215         /* force an immediate update */
1216         mod_delayed_work(system_wq, &charger->work, 0);
1217
1218         return 0;
1219 }
1220
1221 static SIMPLE_DEV_PM_OPS(rk817_charger_pm, NULL, rk817_resume);
1222
1223 static struct platform_driver rk817_charger_driver = {
1224         .probe    = rk817_charger_probe,
1225         .driver   = {
1226                 .name  = "rk817-charger",
1227                 .pm             = &rk817_charger_pm,
1228         },
1229 };
1230 module_platform_driver(rk817_charger_driver);
1231
1232 MODULE_DESCRIPTION("Battery power supply driver for RK817 PMIC");
1233 MODULE_AUTHOR("Maya Matuszczyk <maccraft123mc@gmail.com>");
1234 MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>");
1235 MODULE_LICENSE("GPL");
1236 MODULE_ALIAS("platform:rk817-charger");