drivers/power/supply/axp20x_battery.c

   1 /*
   2  * Battery power supply driver for X-Powers AXP20X and AXP22X PMICs
   3  *
   4  * Copyright 2016 Free Electrons NextThing Co.
   5  *      Quentin Schulz <quentin.schulz@free-electrons.com>
   6  *
   7  * This driver is based on a previous upstreaming attempt by:
   8  *      Bruno Prémont <bonbons@linux-vserver.org>
   9  *
  10  * This file is subject to the terms and conditions of the GNU General
  11  * Public License. See the file "COPYING" in the main directory of this
  12  * archive for more details.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  */
  19
  20 #include <linux/err.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/irq.h>
  23 #include <linux/module.h>
  24 #include <linux/of.h>
  25 #include <linux/of_device.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/power_supply.h>
  28 #include <linux/regmap.h>
  29 #include <linux/slab.h>
  30 #include <linux/time.h>
  31 #include <linux/iio/iio.h>
  32 #include <linux/iio/consumer.h>
  33 #include <linux/mfd/axp20x.h>
  34
  35 #define AXP20X_PWR_STATUS_BAT_CHARGING  BIT(2)
  36
  37 #define AXP20X_PWR_OP_BATT_PRESENT      BIT(5)
  38 #define AXP20X_PWR_OP_BATT_ACTIVATED    BIT(3)
  39
  40 #define AXP209_FG_PERCENT               GENMASK(6, 0)
  41 #define AXP22X_FG_VALID                 BIT(7)
  42
  43 #define AXP20X_CHRG_CTRL1_TGT_VOLT      GENMASK(6, 5)
  44 #define AXP20X_CHRG_CTRL1_TGT_4_1V      (0 << 5)
  45 #define AXP20X_CHRG_CTRL1_TGT_4_15V     (1 << 5)
  46 #define AXP20X_CHRG_CTRL1_TGT_4_2V      (2 << 5)
  47 #define AXP20X_CHRG_CTRL1_TGT_4_36V     (3 << 5)
  48
  49 #define AXP22X_CHRG_CTRL1_TGT_4_22V     (1 << 5)
  50 #define AXP22X_CHRG_CTRL1_TGT_4_24V     (3 << 5)
  51
  52 #define AXP813_CHRG_CTRL1_TGT_4_35V     (3 << 5)
  53
  54 #define AXP20X_CHRG_CTRL1_TGT_CURR      GENMASK(3, 0)
  55
  56 #define AXP20X_V_OFF_MASK               GENMASK(2, 0)
  57
  58 struct axp20x_batt_ps;
  59
  60 struct axp_data {
  61         int     ccc_scale;
  62         int     ccc_offset;
  63         bool    has_fg_valid;
  64         int     (*get_max_voltage)(struct axp20x_batt_ps *batt, int *val);
  65         int     (*set_max_voltage)(struct axp20x_batt_ps *batt, int val);
  66 };
  67
  68 struct axp20x_batt_ps {
  69         struct regmap *regmap;
  70         struct power_supply *batt;
  71         struct device *dev;
  72         struct iio_channel *batt_chrg_i;
  73         struct iio_channel *batt_dischrg_i;
  74         struct iio_channel *batt_v;
  75         /* Maximum constant charge current */
  76         unsigned int max_ccc;
  77         const struct axp_data   *data;
  78 };
  79
  80 static int axp20x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
  81                                           int *val)
  82 {
  83         int ret, reg;
  84
  85         ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, &reg);
  86         if (ret)
  87                 return ret;
  88
  89         switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
  90         case AXP20X_CHRG_CTRL1_TGT_4_1V:
  91                 *val = 4100000;
  92                 break;
  93         case AXP20X_CHRG_CTRL1_TGT_4_15V:
  94                 *val = 4150000;
  95                 break;
  96         case AXP20X_CHRG_CTRL1_TGT_4_2V:
  97                 *val = 4200000;
  98                 break;
  99         case AXP20X_CHRG_CTRL1_TGT_4_36V:
 100                 *val = 4360000;
 101                 break;
 102         default:
 103                 return -EINVAL;
 104         }
 105
 106         return 0;
 107 }
 108
 109 static int axp22x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
 110                                           int *val)
 111 {
 112         int ret, reg;
 113
 114         ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, &reg);
 115         if (ret)
 116                 return ret;
 117
 118         switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
 119         case AXP20X_CHRG_CTRL1_TGT_4_1V:
 120                 *val = 4100000;
 121                 break;
 122         case AXP20X_CHRG_CTRL1_TGT_4_2V:
 123                 *val = 4200000;
 124                 break;
 125         case AXP22X_CHRG_CTRL1_TGT_4_22V:
 126                 *val = 4220000;
 127                 break;
 128         case AXP22X_CHRG_CTRL1_TGT_4_24V:
 129                 *val = 4240000;
 130                 break;
 131         default:
 132                 return -EINVAL;
 133         }
 134
 135         return 0;
 136 }
 137
 138 static int axp813_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
 139                                           int *val)
 140 {
 141         int ret, reg;
 142
 143         ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, &reg);
 144         if (ret)
 145                 return ret;
 146
 147         switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
 148         case AXP20X_CHRG_CTRL1_TGT_4_1V:
 149                 *val = 4100000;
 150                 break;
 151         case AXP20X_CHRG_CTRL1_TGT_4_15V:
 152                 *val = 4150000;
 153                 break;
 154         case AXP20X_CHRG_CTRL1_TGT_4_2V:
 155                 *val = 4200000;
 156                 break;
 157         case AXP813_CHRG_CTRL1_TGT_4_35V:
 158                 *val = 4350000;
 159                 break;
 160         default:
 161                 return -EINVAL;
 162         }
 163
 164         return 0;
 165 }
 166
 167 static int axp20x_get_constant_charge_current(struct axp20x_batt_ps *axp,
 168                                               int *val)
 169 {
 170         int ret;
 171
 172         ret = regmap_read(axp->regmap, AXP20X_CHRG_CTRL1, val);
 173         if (ret)
 174                 return ret;
 175
 176         *val &= AXP20X_CHRG_CTRL1_TGT_CURR;
 177
 178         *val = *val * axp->data->ccc_scale + axp->data->ccc_offset;
 179
 180         return 0;
 181 }
 182
 183 static int axp20x_battery_get_prop(struct power_supply *psy,
 184                                    enum power_supply_property psp,
 185                                    union power_supply_propval *val)
 186 {
 187         struct axp20x_batt_ps *axp20x_batt = power_supply_get_drvdata(psy);
 188         struct iio_channel *chan;
 189         int ret = 0, reg, val1;
 190
 191         switch (psp) {
 192         case POWER_SUPPLY_PROP_PRESENT:
 193         case POWER_SUPPLY_PROP_ONLINE:
 194                 ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
 195                                   &reg);
 196                 if (ret)
 197                         return ret;
 198
 199                 val->intval = !!(reg & AXP20X_PWR_OP_BATT_PRESENT);
 200                 break;
 201
 202         case POWER_SUPPLY_PROP_STATUS:
 203                 ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_INPUT_STATUS,
 204                                   &reg);
 205                 if (ret)
 206                         return ret;
 207
 208                 if (reg & AXP20X_PWR_STATUS_BAT_CHARGING) {
 209                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 210                         return 0;
 211                 }
 212
 213                 ret = iio_read_channel_processed(axp20x_batt->batt_dischrg_i,
 214                                                  &val1);
 215                 if (ret)
 216                         return ret;
 217
 218                 if (val1) {
 219                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 220                         return 0;
 221                 }
 222
 223                 ret = regmap_read(axp20x_batt->regmap, AXP20X_FG_RES, &val1);
 224                 if (ret)
 225                         return ret;
 226
 227                 /*
 228                  * Fuel Gauge data takes 7 bits but the stored value seems to be
 229                  * directly the raw percentage without any scaling to 7 bits.
 230                  */
 231                 if ((val1 & AXP209_FG_PERCENT) == 100)
 232                         val->intval = POWER_SUPPLY_STATUS_FULL;
 233                 else
 234                         val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
 235                 break;
 236
 237         case POWER_SUPPLY_PROP_HEALTH:
 238                 ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
 239                                   &val1);
 240                 if (ret)
 241                         return ret;
 242
 243                 if (val1 & AXP20X_PWR_OP_BATT_ACTIVATED) {
 244                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
 245                         return 0;
 246                 }
 247
 248                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 249                 break;
 250
 251         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 252                 ret = axp20x_get_constant_charge_current(axp20x_batt,
 253                                                          &val->intval);
 254                 if (ret)
 255                         return ret;
 256                 break;
 257
 258         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 259                 val->intval = axp20x_batt->max_ccc;
 260                 break;
 261
 262         case POWER_SUPPLY_PROP_CURRENT_NOW:
 263                 ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_INPUT_STATUS,
 264                                   &reg);
 265                 if (ret)
 266                         return ret;
 267
 268                 if (reg & AXP20X_PWR_STATUS_BAT_CHARGING)
 269                         chan = axp20x_batt->batt_chrg_i;
 270                 else
 271                         chan = axp20x_batt->batt_dischrg_i;
 272
 273                 ret = iio_read_channel_processed(chan, &val->intval);
 274                 if (ret)
 275                         return ret;
 276
 277                 /* IIO framework gives mA but Power Supply framework gives uA */
 278                 val->intval *= 1000;
 279                 break;
 280
 281         case POWER_SUPPLY_PROP_CAPACITY:
 282                 /* When no battery is present, return capacity is 100% */
 283                 ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
 284                                   &reg);
 285                 if (ret)
 286                         return ret;
 287
 288                 if (!(reg & AXP20X_PWR_OP_BATT_PRESENT)) {
 289                         val->intval = 100;
 290                         return 0;
 291                 }
 292
 293                 ret = regmap_read(axp20x_batt->regmap, AXP20X_FG_RES, &reg);
 294                 if (ret)
 295                         return ret;
 296
 297                 if (axp20x_batt->data->has_fg_valid && !(reg & AXP22X_FG_VALID))
 298                         return -EINVAL;
 299
 300                 /*
 301                  * Fuel Gauge data takes 7 bits but the stored value seems to be
 302                  * directly the raw percentage without any scaling to 7 bits.
 303                  */
 304                 val->intval = reg & AXP209_FG_PERCENT;
 305                 break;
 306
 307         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 308                 return axp20x_batt->data->get_max_voltage(axp20x_batt,
 309                                                           &val->intval);
 310
 311         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 312                 ret = regmap_read(axp20x_batt->regmap, AXP20X_V_OFF, &reg);
 313                 if (ret)
 314                         return ret;
 315
 316                 val->intval = 2600000 + 100000 * (reg & AXP20X_V_OFF_MASK);
 317                 break;
 318
 319         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 320                 ret = iio_read_channel_processed(axp20x_batt->batt_v,
 321                                                  &val->intval);
 322                 if (ret)
 323                         return ret;
 324
 325                 /* IIO framework gives mV but Power Supply framework gives uV */
 326                 val->intval *= 1000;
 327                 break;
 328
 329         default:
 330                 return -EINVAL;
 331         }
 332
 333         return 0;
 334 }
 335
 336 static int axp22x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
 337                                           int val)
 338 {
 339         switch (val) {
 340         case 4100000:
 341                 val = AXP20X_CHRG_CTRL1_TGT_4_1V;
 342                 break;
 343
 344         case 4200000:
 345                 val = AXP20X_CHRG_CTRL1_TGT_4_2V;
 346                 break;
 347
 348         default:
 349                 /*
 350                  * AXP20x max voltage can be set to 4.36V and AXP22X max voltage
 351                  * can be set to 4.22V and 4.24V, but these voltages are too
 352                  * high for Lithium based batteries (AXP PMICs are supposed to
 353                  * be used with these kinds of battery).
 354                  */
 355                 return -EINVAL;
 356         }
 357
 358         return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
 359                                   AXP20X_CHRG_CTRL1_TGT_VOLT, val);
 360 }
 361
 362 static int axp20x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
 363                                           int val)
 364 {
 365         switch (val) {
 366         case 4100000:
 367                 val = AXP20X_CHRG_CTRL1_TGT_4_1V;
 368                 break;
 369
 370         case 4150000:
 371                 val = AXP20X_CHRG_CTRL1_TGT_4_15V;
 372                 break;
 373
 374         case 4200000:
 375                 val = AXP20X_CHRG_CTRL1_TGT_4_2V;
 376                 break;
 377
 378         default:
 379                 /*
 380                  * AXP20x max voltage can be set to 4.36V and AXP22X max voltage
 381                  * can be set to 4.22V and 4.24V, but these voltages are too
 382                  * high for Lithium based batteries (AXP PMICs are supposed to
 383                  * be used with these kinds of battery).
 384                  */
 385                 return -EINVAL;
 386         }
 387
 388         return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
 389                                   AXP20X_CHRG_CTRL1_TGT_VOLT, val);
 390 }
 391
 392 static int axp20x_set_constant_charge_current(struct axp20x_batt_ps *axp_batt,
 393                                               int charge_current)
 394 {
 395         if (charge_current > axp_batt->max_ccc)
 396                 return -EINVAL;
 397
 398         charge_current = (charge_current - axp_batt->data->ccc_offset) /
 399                 axp_batt->data->ccc_scale;
 400
 401         if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
 402                 return -EINVAL;
 403
 404         return regmap_update_bits(axp_batt->regmap, AXP20X_CHRG_CTRL1,
 405                                   AXP20X_CHRG_CTRL1_TGT_CURR, charge_current);
 406 }
 407
 408 static int axp20x_set_max_constant_charge_current(struct axp20x_batt_ps *axp,
 409                                                   int charge_current)
 410 {
 411         bool lower_max = false;
 412
 413         charge_current = (charge_current - axp->data->ccc_offset) /
 414                 axp->data->ccc_scale;
 415
 416         if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
 417                 return -EINVAL;
 418
 419         charge_current = charge_current * axp->data->ccc_scale +
 420                 axp->data->ccc_offset;
 421
 422         if (charge_current > axp->max_ccc)
 423                 dev_warn(axp->dev,
 424                          "Setting max constant charge current higher than previously defined. Note that increasing the constant charge current may damage your battery.\n");
 425         else
 426                 lower_max = true;
 427
 428         axp->max_ccc = charge_current;
 429
 430         if (lower_max) {
 431                 int current_cc;
 432
 433                 axp20x_get_constant_charge_current(axp, &current_cc);
 434                 if (current_cc > charge_current)
 435                         axp20x_set_constant_charge_current(axp, charge_current);
 436         }
 437
 438         return 0;
 439 }
 440 static int axp20x_set_voltage_min_design(struct axp20x_batt_ps *axp_batt,
 441                                          int min_voltage)
 442 {
 443         int val1 = (min_voltage - 2600000) / 100000;
 444
 445         if (val1 < 0 || val1 > AXP20X_V_OFF_MASK)
 446                 return -EINVAL;
 447
 448         return regmap_update_bits(axp_batt->regmap, AXP20X_V_OFF,
 449                                   AXP20X_V_OFF_MASK, val1);
 450 }
 451
 452 static int axp20x_battery_set_prop(struct power_supply *psy,
 453                                    enum power_supply_property psp,
 454                                    const union power_supply_propval *val)
 455 {
 456         struct axp20x_batt_ps *axp20x_batt = power_supply_get_drvdata(psy);
 457
 458         switch (psp) {
 459         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 460                 return axp20x_set_voltage_min_design(axp20x_batt, val->intval);
 461
 462         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 463                 return axp20x_batt->data->set_max_voltage(axp20x_batt, val->intval);
 464
 465         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
 466                 return axp20x_set_constant_charge_current(axp20x_batt,
 467                                                           val->intval);
 468         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
 469                 return axp20x_set_max_constant_charge_current(axp20x_batt,
 470                                                               val->intval);
 471
 472         default:
 473                 return -EINVAL;
 474         }
 475 }
 476
 477 static enum power_supply_property axp20x_battery_props[] = {
 478         POWER_SUPPLY_PROP_PRESENT,
 479         POWER_SUPPLY_PROP_ONLINE,
 480         POWER_SUPPLY_PROP_STATUS,
 481         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 482         POWER_SUPPLY_PROP_CURRENT_NOW,
 483         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
 484         POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
 485         POWER_SUPPLY_PROP_HEALTH,
 486         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 487         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 488         POWER_SUPPLY_PROP_CAPACITY,
 489 };
 490
 491 static int axp20x_battery_prop_writeable(struct power_supply *psy,
 492                                          enum power_supply_property psp)
 493 {
 494         return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN ||
 495                psp == POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN ||
 496                psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT ||
 497                psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX;
 498 }
 499
 500 static const struct power_supply_desc axp20x_batt_ps_desc = {
 501         .name = "axp20x-battery",
 502         .type = POWER_SUPPLY_TYPE_BATTERY,
 503         .properties = axp20x_battery_props,
 504         .num_properties = ARRAY_SIZE(axp20x_battery_props),
 505         .property_is_writeable = axp20x_battery_prop_writeable,
 506         .get_property = axp20x_battery_get_prop,
 507         .set_property = axp20x_battery_set_prop,
 508 };
 509
 510 static const struct axp_data axp209_data = {
 511         .ccc_scale = 100000,
 512         .ccc_offset = 300000,
 513         .get_max_voltage = axp20x_battery_get_max_voltage,
 514         .set_max_voltage = axp20x_battery_set_max_voltage,
 515 };
 516
 517 static const struct axp_data axp221_data = {
 518         .ccc_scale = 150000,
 519         .ccc_offset = 300000,
 520         .has_fg_valid = true,
 521         .get_max_voltage = axp22x_battery_get_max_voltage,
 522         .set_max_voltage = axp22x_battery_set_max_voltage,
 523 };
 524
 525 static const struct axp_data axp813_data = {
 526         .ccc_scale = 200000,
 527         .ccc_offset = 200000,
 528         .has_fg_valid = true,
 529         .get_max_voltage = axp813_battery_get_max_voltage,
 530         .set_max_voltage = axp20x_battery_set_max_voltage,
 531 };
 532
 533 static const struct of_device_id axp20x_battery_ps_id[] = {
 534         {
 535                 .compatible = "x-powers,axp209-battery-power-supply",
 536                 .data = (void *)&axp209_data,
 537         }, {
 538                 .compatible = "x-powers,axp221-battery-power-supply",
 539                 .data = (void *)&axp221_data,
 540         }, {
 541                 .compatible = "x-powers,axp813-battery-power-supply",
 542                 .data = (void *)&axp813_data,
 543         }, { /* sentinel */ },
 544 };
 545 MODULE_DEVICE_TABLE(of, axp20x_battery_ps_id);
 546
 547 static int axp20x_power_probe(struct platform_device *pdev)
 548 {
 549         struct axp20x_batt_ps *axp20x_batt;
 550         struct power_supply_config psy_cfg = {};
 551         struct power_supply_battery_info info;
 552         struct device *dev = &pdev->dev;
 553
 554         if (!of_device_is_available(pdev->dev.of_node))
 555                 return -ENODEV;
 556
 557         axp20x_batt = devm_kzalloc(&pdev->dev, sizeof(*axp20x_batt),
 558                                    GFP_KERNEL);
 559         if (!axp20x_batt)
 560                 return -ENOMEM;
 561
 562         axp20x_batt->dev = &pdev->dev;
 563
 564         axp20x_batt->batt_v = devm_iio_channel_get(&pdev->dev, "batt_v");
 565         if (IS_ERR(axp20x_batt->batt_v)) {
 566                 if (PTR_ERR(axp20x_batt->batt_v) == -ENODEV)
 567                         return -EPROBE_DEFER;
 568                 return PTR_ERR(axp20x_batt->batt_v);
 569         }
 570
 571         axp20x_batt->batt_chrg_i = devm_iio_channel_get(&pdev->dev,
 572                                                         "batt_chrg_i");
 573         if (IS_ERR(axp20x_batt->batt_chrg_i)) {
 574                 if (PTR_ERR(axp20x_batt->batt_chrg_i) == -ENODEV)
 575                         return -EPROBE_DEFER;
 576                 return PTR_ERR(axp20x_batt->batt_chrg_i);
 577         }
 578
 579         axp20x_batt->batt_dischrg_i = devm_iio_channel_get(&pdev->dev,
 580                                                            "batt_dischrg_i");
 581         if (IS_ERR(axp20x_batt->batt_dischrg_i)) {
 582                 if (PTR_ERR(axp20x_batt->batt_dischrg_i) == -ENODEV)
 583                         return -EPROBE_DEFER;
 584                 return PTR_ERR(axp20x_batt->batt_dischrg_i);
 585         }
 586
 587         axp20x_batt->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 588         platform_set_drvdata(pdev, axp20x_batt);
 589
 590         psy_cfg.drv_data = axp20x_batt;
 591         psy_cfg.of_node = pdev->dev.of_node;
 592
 593         axp20x_batt->data = (struct axp_data *)of_device_get_match_data(dev);
 594
 595         axp20x_batt->batt = devm_power_supply_register(&pdev->dev,
 596                                                        &axp20x_batt_ps_desc,
 597                                                        &psy_cfg);
 598         if (IS_ERR(axp20x_batt->batt)) {
 599                 dev_err(&pdev->dev, "failed to register power supply: %ld\n",
 600                         PTR_ERR(axp20x_batt->batt));
 601                 return PTR_ERR(axp20x_batt->batt);
 602         }
 603
 604         if (!power_supply_get_battery_info(axp20x_batt->batt, &info)) {
 605                 int vmin = info.voltage_min_design_uv;
 606                 int ccc = info.constant_charge_current_max_ua;
 607
 608                 if (vmin > 0 && axp20x_set_voltage_min_design(axp20x_batt,
 609                                                               vmin))
 610                         dev_err(&pdev->dev,
 611                                 "couldn't set voltage_min_design\n");
 612
 613                 /* Set max to unverified value to be able to set CCC */
 614                 axp20x_batt->max_ccc = ccc;
 615
 616                 if (ccc <= 0 || axp20x_set_constant_charge_current(axp20x_batt,
 617                                                                    ccc)) {
 618                         dev_err(&pdev->dev,
 619                                 "couldn't set constant charge current from DT: fallback to minimum value\n");
 620                         ccc = 300000;
 621                         axp20x_batt->max_ccc = ccc;
 622                         axp20x_set_constant_charge_current(axp20x_batt, ccc);
 623                 }
 624         }
 625
 626         /*
 627          * Update max CCC to a valid value if battery info is present or set it
 628          * to current register value by default.
 629          */
 630         axp20x_get_constant_charge_current(axp20x_batt,
 631                                            &axp20x_batt->max_ccc);
 632
 633         return 0;
 634 }
 635
 636 static struct platform_driver axp20x_batt_driver = {
 637         .probe    = axp20x_power_probe,
 638         .driver   = {
 639                 .name  = "axp20x-battery-power-supply",
 640                 .of_match_table = axp20x_battery_ps_id,
 641         },
 642 };
 643
 644 module_platform_driver(axp20x_batt_driver);
 645
 646 MODULE_DESCRIPTION("Battery power supply driver for AXP20X and AXP22X PMICs");
 647 MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
 648 MODULE_LICENSE("GPL");