drivers/power/supply/ucs1002_power.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Driver for UCS1002 Programmable USB Port Power Controller
   4  *
   5  * Copyright (C) 2019 Zodiac Inflight Innovations
   6  */
   7 #include <linux/bits.h>
   8 #include <linux/freezer.h>
   9 #include <linux/gpio/consumer.h>
  10 #include <linux/i2c.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/kernel.h>
  13 #include <linux/kthread.h>
  14 #include <linux/device.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/of_irq.h>
  18 #include <linux/power_supply.h>
  19 #include <linux/regmap.h>
  20 #include <linux/regulator/driver.h>
  21 #include <linux/regulator/of_regulator.h>
  22
  23 /* UCS1002 Registers */
  24 #define UCS1002_REG_CURRENT_MEASUREMENT 0x00
  25
  26 /*
  27  * The Total Accumulated Charge registers store the total accumulated
  28  * charge delivered from the VS source to a portable device. The total
  29  * value is calculated using four registers, from 01h to 04h. The bit
  30  * weighting of the registers is given in mA/hrs.
  31  */
  32 #define UCS1002_REG_TOTAL_ACC_CHARGE    0x01
  33
  34 /* Other Status Register */
  35 #define UCS1002_REG_OTHER_STATUS        0x0f
  36 #  define F_ADET_PIN                    BIT(4)
  37 #  define F_CHG_ACT                     BIT(3)
  38
  39 /* Interrupt Status */
  40 #define UCS1002_REG_INTERRUPT_STATUS    0x10
  41 #  define F_ERR                         BIT(7)
  42 #  define F_DISCHARGE_ERR               BIT(6)
  43 #  define F_RESET                       BIT(5)
  44 #  define F_MIN_KEEP_OUT                BIT(4)
  45 #  define F_TSD                         BIT(3)
  46 #  define F_OVER_VOLT                   BIT(2)
  47 #  define F_BACK_VOLT                   BIT(1)
  48 #  define F_OVER_ILIM                   BIT(0)
  49
  50 /* Pin Status Register */
  51 #define UCS1002_REG_PIN_STATUS          0x14
  52 #  define UCS1002_PWR_STATE_MASK        0x03
  53 #  define F_PWR_EN_PIN                  BIT(6)
  54 #  define F_M2_PIN                      BIT(5)
  55 #  define F_M1_PIN                      BIT(4)
  56 #  define F_EM_EN_PIN                   BIT(3)
  57 #  define F_SEL_PIN                     BIT(2)
  58 #  define F_ACTIVE_MODE_MASK            GENMASK(5, 3)
  59 #  define F_ACTIVE_MODE_PASSTHROUGH     F_M2_PIN
  60 #  define F_ACTIVE_MODE_DEDICATED       F_EM_EN_PIN
  61 #  define F_ACTIVE_MODE_BC12_DCP        (F_M2_PIN | F_EM_EN_PIN)
  62 #  define F_ACTIVE_MODE_BC12_SDP        F_M1_PIN
  63 #  define F_ACTIVE_MODE_BC12_CDP        (F_M1_PIN | F_M2_PIN | F_EM_EN_PIN)
  64
  65 /* General Configuration Register */
  66 #define UCS1002_REG_GENERAL_CFG         0x15
  67 #  define F_RATION_EN                   BIT(3)
  68
  69 /* Emulation Configuration Register */
  70 #define UCS1002_REG_EMU_CFG             0x16
  71
  72 /* Switch Configuration Register */
  73 #define UCS1002_REG_SWITCH_CFG          0x17
  74 #  define F_PIN_IGNORE                  BIT(7)
  75 #  define F_EM_EN_SET                   BIT(5)
  76 #  define F_M2_SET                      BIT(4)
  77 #  define F_M1_SET                      BIT(3)
  78 #  define F_S0_SET                      BIT(2)
  79 #  define F_PWR_EN_SET                  BIT(1)
  80 #  define F_LATCH_SET                   BIT(0)
  81 #  define V_SET_ACTIVE_MODE_MASK        GENMASK(5, 3)
  82 #  define V_SET_ACTIVE_MODE_PASSTHROUGH F_M2_SET
  83 #  define V_SET_ACTIVE_MODE_DEDICATED   F_EM_EN_SET
  84 #  define V_SET_ACTIVE_MODE_BC12_DCP    (F_M2_SET | F_EM_EN_SET)
  85 #  define V_SET_ACTIVE_MODE_BC12_SDP    F_M1_SET
  86 #  define V_SET_ACTIVE_MODE_BC12_CDP    (F_M1_SET | F_M2_SET | F_EM_EN_SET)
  87
  88 /* Current Limit Register */
  89 #define UCS1002_REG_ILIMIT              0x19
  90 #  define UCS1002_ILIM_SW_MASK          GENMASK(3, 0)
  91
  92 /* Product ID */
  93 #define UCS1002_REG_PRODUCT_ID          0xfd
  94 #  define UCS1002_PRODUCT_ID            0x4e
  95
  96 /* Manufacture name */
  97 #define UCS1002_MANUFACTURER            "SMSC"
  98
  99 struct ucs1002_info {
 100         struct power_supply *charger;
 101         struct i2c_client *client;
 102         struct regmap *regmap;
 103         struct regulator_desc *regulator_descriptor;
 104         struct regulator_dev *rdev;
 105         bool present;
 106         bool output_disable;
 107         struct delayed_work health_poll;
 108         int health;
 109
 110 };
 111
 112 static enum power_supply_property ucs1002_props[] = {
 113         POWER_SUPPLY_PROP_ONLINE,
 114         POWER_SUPPLY_PROP_CHARGE_NOW,
 115         POWER_SUPPLY_PROP_CURRENT_NOW,
 116         POWER_SUPPLY_PROP_CURRENT_MAX,
 117         POWER_SUPPLY_PROP_PRESENT, /* the presence of PED */
 118         POWER_SUPPLY_PROP_MANUFACTURER,
 119         POWER_SUPPLY_PROP_USB_TYPE,
 120         POWER_SUPPLY_PROP_HEALTH,
 121 };
 122
 123 static int ucs1002_get_online(struct ucs1002_info *info,
 124                               union power_supply_propval *val)
 125 {
 126         unsigned int reg;
 127         int ret;
 128
 129         ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, &reg);
 130         if (ret)
 131                 return ret;
 132
 133         val->intval = !!(reg & F_CHG_ACT);
 134
 135         return 0;
 136 }
 137
 138 static int ucs1002_get_charge(struct ucs1002_info *info,
 139                               union power_supply_propval *val)
 140 {
 141         /*
 142          * To fit within 32 bits some values are rounded (uA/h)
 143          *
 144          * For Total Accumulated Charge Middle Low Byte register, addr
 145          * 03h, byte 2
 146          *
 147          *   B0: 0.01084 mA/h rounded to 11 uA/h
 148          *   B1: 0.02169 mA/h rounded to 22 uA/h
 149          *   B2: 0.04340 mA/h rounded to 43 uA/h
 150          *   B3: 0.08676 mA/h rounded to 87 uA/h
 151          *   B4: 0.17350 mA/h rounded to 173 uÁ/h
 152          *
 153          * For Total Accumulated Charge Low Byte register, addr 04h,
 154          * byte 3
 155          *
 156          *   B6: 0.00271 mA/h rounded to 3 uA/h
 157          *   B7: 0.005422 mA/h rounded to 5 uA/h
 158          */
 159         static const int bit_weights_uAh[BITS_PER_TYPE(u32)] = {
 160                 /*
 161                  * Bit corresponding to low byte (offset 0x04)
 162                  * B0 B1 B2 B3 B4 B5 B6 B7
 163                  */
 164                 0, 0, 0, 0, 0, 0, 3, 5,
 165                 /*
 166                  * Bit corresponding to middle low byte (offset 0x03)
 167                  * B0 B1 B2 B3 B4 B5 B6 B7
 168                  */
 169                 11, 22, 43, 87, 173, 347, 694, 1388,
 170                 /*
 171                  * Bit corresponding to middle high byte (offset 0x02)
 172                  * B0 B1 B2 B3 B4 B5 B6 B7
 173                  */
 174                 2776, 5552, 11105, 22210, 44420, 88840, 177700, 355400,
 175                 /*
 176                  * Bit corresponding to high byte (offset 0x01)
 177                  * B0 B1 B2 B3 B4 B5 B6 B7
 178                  */
 179                 710700, 1421000, 2843000, 5685000, 11371000, 22742000,
 180                 45484000, 90968000,
 181         };
 182         unsigned long total_acc_charger;
 183         unsigned int reg;
 184         int i, ret;
 185
 186         ret = regmap_bulk_read(info->regmap, UCS1002_REG_TOTAL_ACC_CHARGE,
 187                                &reg, sizeof(u32));
 188         if (ret)
 189                 return ret;
 190
 191         total_acc_charger = be32_to_cpu(reg); /* BE as per offsets above */
 192         val->intval = 0;
 193
 194         for_each_set_bit(i, &total_acc_charger, ARRAY_SIZE(bit_weights_uAh))
 195                 val->intval += bit_weights_uAh[i];
 196
 197         return 0;
 198 }
 199
 200 static int ucs1002_get_current(struct ucs1002_info *info,
 201                                union power_supply_propval *val)
 202 {
 203         /*
 204          * The Current Measurement register stores the measured
 205          * current value delivered to the portable device. The range
 206          * is from 9.76 mA to 2.5 A.
 207          */
 208         static const int bit_weights_uA[BITS_PER_TYPE(u8)] = {
 209                 9760, 19500, 39000, 78100, 156200, 312300, 624600, 1249300,
 210         };
 211         unsigned long current_measurement;
 212         unsigned int reg;
 213         int i, ret;
 214
 215         ret = regmap_read(info->regmap, UCS1002_REG_CURRENT_MEASUREMENT, &reg);
 216         if (ret)
 217                 return ret;
 218
 219         current_measurement = reg;
 220         val->intval = 0;
 221
 222         for_each_set_bit(i, &current_measurement, ARRAY_SIZE(bit_weights_uA))
 223                 val->intval += bit_weights_uA[i];
 224
 225         return 0;
 226 }
 227
 228 /*
 229  * The Current Limit register stores the maximum current used by the
 230  * port switch. The range is from 500mA to 2.5 A.
 231  */
 232 static const u32 ucs1002_current_limit_uA[] = {
 233         500000, 900000, 1000000, 1200000, 1500000, 1800000, 2000000, 2500000,
 234 };
 235
 236 static int ucs1002_get_max_current(struct ucs1002_info *info,
 237                                    union power_supply_propval *val)
 238 {
 239         unsigned int reg;
 240         int ret;
 241
 242         if (info->output_disable) {
 243                 val->intval = 0;
 244                 return 0;
 245         }
 246
 247         ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, &reg);
 248         if (ret)
 249                 return ret;
 250
 251         val->intval = ucs1002_current_limit_uA[reg & UCS1002_ILIM_SW_MASK];
 252
 253         return 0;
 254 }
 255
 256 static int ucs1002_set_max_current(struct ucs1002_info *info, u32 val)
 257 {
 258         unsigned int reg;
 259         int ret, idx;
 260
 261         if (val == 0) {
 262                 info->output_disable = true;
 263                 regulator_disable_regmap(info->rdev);
 264                 return 0;
 265         }
 266
 267         for (idx = 0; idx < ARRAY_SIZE(ucs1002_current_limit_uA); idx++) {
 268                 if (val == ucs1002_current_limit_uA[idx])
 269                         break;
 270         }
 271
 272         if (idx == ARRAY_SIZE(ucs1002_current_limit_uA))
 273                 return -EINVAL;
 274
 275         ret = regmap_write(info->regmap, UCS1002_REG_ILIMIT, idx);
 276         if (ret)
 277                 return ret;
 278         /*
 279          * Any current limit setting exceeding the one set via ILIM
 280          * pin will be rejected, so we read out freshly changed limit
 281          * to make sure that it took effect.
 282          */
 283         ret = regmap_read(info->regmap, UCS1002_REG_ILIMIT, &reg);
 284         if (ret)
 285                 return ret;
 286
 287         if (reg != idx)
 288                 return -EINVAL;
 289
 290         info->output_disable = false;
 291
 292         if (info->rdev && info->rdev->use_count &&
 293             !regulator_is_enabled_regmap(info->rdev))
 294                 regulator_enable_regmap(info->rdev);
 295
 296         return 0;
 297 }
 298
 299 static enum power_supply_usb_type ucs1002_usb_types[] = {
 300         POWER_SUPPLY_USB_TYPE_PD,
 301         POWER_SUPPLY_USB_TYPE_SDP,
 302         POWER_SUPPLY_USB_TYPE_DCP,
 303         POWER_SUPPLY_USB_TYPE_CDP,
 304         POWER_SUPPLY_USB_TYPE_UNKNOWN,
 305 };
 306
 307 static int ucs1002_set_usb_type(struct ucs1002_info *info, int val)
 308 {
 309         unsigned int mode;
 310
 311         if (val < 0 || val >= ARRAY_SIZE(ucs1002_usb_types))
 312                 return -EINVAL;
 313
 314         switch (ucs1002_usb_types[val]) {
 315         case POWER_SUPPLY_USB_TYPE_PD:
 316                 mode = V_SET_ACTIVE_MODE_DEDICATED;
 317                 break;
 318         case POWER_SUPPLY_USB_TYPE_SDP:
 319                 mode = V_SET_ACTIVE_MODE_BC12_SDP;
 320                 break;
 321         case POWER_SUPPLY_USB_TYPE_DCP:
 322                 mode = V_SET_ACTIVE_MODE_BC12_DCP;
 323                 break;
 324         case POWER_SUPPLY_USB_TYPE_CDP:
 325                 mode = V_SET_ACTIVE_MODE_BC12_CDP;
 326                 break;
 327         default:
 328                 return -EINVAL;
 329         }
 330
 331         return regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG,
 332                                   V_SET_ACTIVE_MODE_MASK, mode);
 333 }
 334
 335 static int ucs1002_get_usb_type(struct ucs1002_info *info,
 336                                 union power_supply_propval *val)
 337 {
 338         enum power_supply_usb_type type;
 339         unsigned int reg;
 340         int ret;
 341
 342         ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, &reg);
 343         if (ret)
 344                 return ret;
 345
 346         switch (reg & F_ACTIVE_MODE_MASK) {
 347         default:
 348                 type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
 349                 break;
 350         case F_ACTIVE_MODE_DEDICATED:
 351                 type = POWER_SUPPLY_USB_TYPE_PD;
 352                 break;
 353         case F_ACTIVE_MODE_BC12_SDP:
 354                 type = POWER_SUPPLY_USB_TYPE_SDP;
 355                 break;
 356         case F_ACTIVE_MODE_BC12_DCP:
 357                 type = POWER_SUPPLY_USB_TYPE_DCP;
 358                 break;
 359         case F_ACTIVE_MODE_BC12_CDP:
 360                 type = POWER_SUPPLY_USB_TYPE_CDP;
 361                 break;
 362         }
 363
 364         val->intval = type;
 365
 366         return 0;
 367 }
 368
 369 static int ucs1002_get_property(struct power_supply *psy,
 370                                 enum power_supply_property psp,
 371                                 union power_supply_propval *val)
 372 {
 373         struct ucs1002_info *info = power_supply_get_drvdata(psy);
 374
 375         switch (psp) {
 376         case POWER_SUPPLY_PROP_ONLINE:
 377                 return ucs1002_get_online(info, val);
 378         case POWER_SUPPLY_PROP_CHARGE_NOW:
 379                 return ucs1002_get_charge(info, val);
 380         case POWER_SUPPLY_PROP_CURRENT_NOW:
 381                 return ucs1002_get_current(info, val);
 382         case POWER_SUPPLY_PROP_CURRENT_MAX:
 383                 return ucs1002_get_max_current(info, val);
 384         case POWER_SUPPLY_PROP_USB_TYPE:
 385                 return ucs1002_get_usb_type(info, val);
 386         case POWER_SUPPLY_PROP_HEALTH:
 387                 return val->intval = info->health;
 388         case POWER_SUPPLY_PROP_PRESENT:
 389                 val->intval = info->present;
 390                 return 0;
 391         case POWER_SUPPLY_PROP_MANUFACTURER:
 392                 val->strval = UCS1002_MANUFACTURER;
 393                 return 0;
 394         default:
 395                 return -EINVAL;
 396         }
 397 }
 398
 399 static int ucs1002_set_property(struct power_supply *psy,
 400                                 enum power_supply_property psp,
 401                                 const union power_supply_propval *val)
 402 {
 403         struct ucs1002_info *info = power_supply_get_drvdata(psy);
 404
 405         switch (psp) {
 406         case POWER_SUPPLY_PROP_CURRENT_MAX:
 407                 return ucs1002_set_max_current(info, val->intval);
 408         case POWER_SUPPLY_PROP_USB_TYPE:
 409                 return ucs1002_set_usb_type(info, val->intval);
 410         default:
 411                 return -EINVAL;
 412         }
 413 }
 414
 415 static int ucs1002_property_is_writeable(struct power_supply *psy,
 416                                          enum power_supply_property psp)
 417 {
 418         switch (psp) {
 419         case POWER_SUPPLY_PROP_CURRENT_MAX:
 420         case POWER_SUPPLY_PROP_USB_TYPE:
 421                 return true;
 422         default:
 423                 return false;
 424         }
 425 }
 426
 427 static const struct power_supply_desc ucs1002_charger_desc = {
 428         .name                   = "ucs1002",
 429         .type                   = POWER_SUPPLY_TYPE_USB,
 430         .usb_types              = ucs1002_usb_types,
 431         .num_usb_types          = ARRAY_SIZE(ucs1002_usb_types),
 432         .get_property           = ucs1002_get_property,
 433         .set_property           = ucs1002_set_property,
 434         .property_is_writeable  = ucs1002_property_is_writeable,
 435         .properties             = ucs1002_props,
 436         .num_properties         = ARRAY_SIZE(ucs1002_props),
 437 };
 438
 439 static void ucs1002_health_poll(struct work_struct *work)
 440 {
 441         struct ucs1002_info *info = container_of(work, struct ucs1002_info,
 442                                                  health_poll.work);
 443         int ret;
 444         u32 reg;
 445
 446         ret = regmap_read(info->regmap, UCS1002_REG_INTERRUPT_STATUS, &reg);
 447         if (ret)
 448                 return;
 449
 450         /* bad health and no status change, just schedule us again in a while */
 451         if ((reg & F_ERR) && info->health != POWER_SUPPLY_HEALTH_GOOD) {
 452                 schedule_delayed_work(&info->health_poll,
 453                                       msecs_to_jiffies(2000));
 454                 return;
 455         }
 456
 457         if (reg & F_TSD)
 458                 info->health = POWER_SUPPLY_HEALTH_OVERHEAT;
 459         else if (reg & (F_OVER_VOLT | F_BACK_VOLT))
 460                 info->health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
 461         else if (reg & F_OVER_ILIM)
 462                 info->health = POWER_SUPPLY_HEALTH_OVERCURRENT;
 463         else if (reg & (F_DISCHARGE_ERR | F_MIN_KEEP_OUT))
 464                 info->health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 465         else
 466                 info->health = POWER_SUPPLY_HEALTH_GOOD;
 467
 468         sysfs_notify(&info->charger->dev.kobj, NULL, "health");
 469 }
 470
 471 static irqreturn_t ucs1002_charger_irq(int irq, void *data)
 472 {
 473         int ret, regval;
 474         bool present;
 475         struct ucs1002_info *info = data;
 476
 477         present = info->present;
 478
 479         ret = regmap_read(info->regmap, UCS1002_REG_OTHER_STATUS, &regval);
 480         if (ret)
 481                 return IRQ_HANDLED;
 482
 483         /* update attached status */
 484         info->present = regval & F_ADET_PIN;
 485
 486         /* notify the change */
 487         if (present != info->present)
 488                 power_supply_changed(info->charger);
 489
 490         return IRQ_HANDLED;
 491 }
 492
 493 static irqreturn_t ucs1002_alert_irq(int irq, void *data)
 494 {
 495         struct ucs1002_info *info = data;
 496
 497         mod_delayed_work(system_wq, &info->health_poll, 0);
 498
 499         return IRQ_HANDLED;
 500 }
 501
 502 static int ucs1002_regulator_enable(struct regulator_dev *rdev)
 503 {
 504         struct ucs1002_info *info = rdev_get_drvdata(rdev);
 505
 506         /*
 507          * If the output is disabled due to 0 maximum current, just pretend the
 508          * enable did work. The regulator will be enabled as soon as we get a
 509          * a non-zero maximum current budget.
 510          */
 511         if (info->output_disable)
 512                 return 0;
 513
 514         return regulator_enable_regmap(rdev);
 515 }
 516
 517 static const struct regulator_ops ucs1002_regulator_ops = {
 518         .is_enabled     = regulator_is_enabled_regmap,
 519         .enable         = ucs1002_regulator_enable,
 520         .disable        = regulator_disable_regmap,
 521 };
 522
 523 static const struct regulator_desc ucs1002_regulator_descriptor = {
 524         .name           = "ucs1002-vbus",
 525         .ops            = &ucs1002_regulator_ops,
 526         .type           = REGULATOR_VOLTAGE,
 527         .owner          = THIS_MODULE,
 528         .enable_reg     = UCS1002_REG_SWITCH_CFG,
 529         .enable_mask    = F_PWR_EN_SET,
 530         .enable_val     = F_PWR_EN_SET,
 531         .fixed_uV       = 5000000,
 532         .n_voltages     = 1,
 533 };
 534
 535 static int ucs1002_probe(struct i2c_client *client)
 536 {
 537         struct device *dev = &client->dev;
 538         struct power_supply_config charger_config = {};
 539         const struct regmap_config regmap_config = {
 540                 .reg_bits = 8,
 541                 .val_bits = 8,
 542         };
 543         struct regulator_config regulator_config = {};
 544         int irq_a_det, irq_alert, ret;
 545         struct ucs1002_info *info;
 546         unsigned int regval;
 547
 548         info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
 549         if (!info)
 550                 return -ENOMEM;
 551
 552         info->regmap = devm_regmap_init_i2c(client, &regmap_config);
 553         ret = PTR_ERR_OR_ZERO(info->regmap);
 554         if (ret) {
 555                 dev_err(dev, "Regmap initialization failed: %d\n", ret);
 556                 return ret;
 557         }
 558
 559         info->client = client;
 560
 561         irq_a_det = of_irq_get_byname(dev->of_node, "a_det");
 562         irq_alert = of_irq_get_byname(dev->of_node, "alert");
 563
 564         charger_config.of_node = dev->of_node;
 565         charger_config.drv_data = info;
 566
 567         ret = regmap_read(info->regmap, UCS1002_REG_PRODUCT_ID, &regval);
 568         if (ret) {
 569                 dev_err(dev, "Failed to read product ID: %d\n", ret);
 570                 return ret;
 571         }
 572
 573         if (regval != UCS1002_PRODUCT_ID) {
 574                 dev_err(dev,
 575                         "Product ID does not match (0x%02x != 0x%02x)\n",
 576                         regval, UCS1002_PRODUCT_ID);
 577                 return -ENODEV;
 578         }
 579
 580         /* Enable charge rationing by default */
 581         ret = regmap_update_bits(info->regmap, UCS1002_REG_GENERAL_CFG,
 582                                  F_RATION_EN, F_RATION_EN);
 583         if (ret) {
 584                 dev_err(dev, "Failed to read general config: %d\n", ret);
 585                 return ret;
 586         }
 587
 588         /*
 589          * Ignore the M1, M2, PWR_EN, and EM_EN pin states. Set active
 590          * mode selection to BC1.2 CDP.
 591          */
 592         ret = regmap_update_bits(info->regmap, UCS1002_REG_SWITCH_CFG,
 593                                  V_SET_ACTIVE_MODE_MASK | F_PIN_IGNORE,
 594                                  V_SET_ACTIVE_MODE_BC12_CDP | F_PIN_IGNORE);
 595         if (ret) {
 596                 dev_err(dev, "Failed to configure default mode: %d\n", ret);
 597                 return ret;
 598         }
 599         /*
 600          * Be safe and set initial current limit to 500mA
 601          */
 602         ret = ucs1002_set_max_current(info, 500000);
 603         if (ret) {
 604                 dev_err(dev, "Failed to set max current default: %d\n", ret);
 605                 return ret;
 606         }
 607
 608         info->charger = devm_power_supply_register(dev, &ucs1002_charger_desc,
 609                                                    &charger_config);
 610         ret = PTR_ERR_OR_ZERO(info->charger);
 611         if (ret) {
 612                 dev_err(dev, "Failed to register power supply: %d\n", ret);
 613                 return ret;
 614         }
 615
 616         ret = regmap_read(info->regmap, UCS1002_REG_PIN_STATUS, &regval);
 617         if (ret) {
 618                 dev_err(dev, "Failed to read pin status: %d\n", ret);
 619                 return ret;
 620         }
 621
 622         info->regulator_descriptor =
 623                 devm_kmemdup(dev, &ucs1002_regulator_descriptor,
 624                              sizeof(ucs1002_regulator_descriptor),
 625                              GFP_KERNEL);
 626         if (!info->regulator_descriptor)
 627                 return -ENOMEM;
 628
 629         info->regulator_descriptor->enable_is_inverted = !(regval & F_SEL_PIN);
 630
 631         regulator_config.dev = dev;
 632         regulator_config.of_node = dev->of_node;
 633         regulator_config.regmap = info->regmap;
 634         regulator_config.driver_data = info;
 635
 636         info->rdev = devm_regulator_register(dev, info->regulator_descriptor,
 637                                        &regulator_config);
 638         ret = PTR_ERR_OR_ZERO(info->rdev);
 639         if (ret) {
 640                 dev_err(dev, "Failed to register VBUS regulator: %d\n", ret);
 641                 return ret;
 642         }
 643
 644         info->health = POWER_SUPPLY_HEALTH_GOOD;
 645         INIT_DELAYED_WORK(&info->health_poll, ucs1002_health_poll);
 646
 647         if (irq_a_det > 0) {
 648                 ret = devm_request_threaded_irq(dev, irq_a_det, NULL,
 649                                                 ucs1002_charger_irq,
 650                                                 IRQF_ONESHOT,
 651                                                 "ucs1002-a_det", info);
 652                 if (ret) {
 653                         dev_err(dev, "Failed to request A_DET threaded irq: %d\n",
 654                                 ret);
 655                         return ret;
 656                 }
 657         }
 658
 659         if (irq_alert > 0) {
 660                 ret = devm_request_irq(dev, irq_alert, ucs1002_alert_irq,
 661                                        0,"ucs1002-alert", info);
 662                 if (ret) {
 663                         dev_err(dev, "Failed to request ALERT threaded irq: %d\n",
 664                                 ret);
 665                         return ret;
 666                 }
 667         }
 668
 669         return 0;
 670 }
 671
 672 static const struct of_device_id ucs1002_of_match[] = {
 673         { .compatible = "microchip,ucs1002", },
 674         { /* sentinel */ },
 675 };
 676 MODULE_DEVICE_TABLE(of, ucs1002_of_match);
 677
 678 static struct i2c_driver ucs1002_driver = {
 679         .driver = {
 680                    .name = "ucs1002",
 681                    .of_match_table = ucs1002_of_match,
 682         },
 683         .probe = ucs1002_probe,
 684 };
 685 module_i2c_driver(ucs1002_driver);
 686
 687 MODULE_DESCRIPTION("Microchip UCS1002 Programmable USB Port Power Controller");
 688 MODULE_AUTHOR("Enric Balletbo Serra <enric.balletbo@collabora.com>");
 689 MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
 690 MODULE_LICENSE("GPL");