drivers/power/supply/axp20x_usb_power.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * AXP20x PMIC USB power supply status driver
   4  *
   5  * Copyright (C) 2015 Hans de Goede <hdegoede@redhat.com>
   6  * Copyright (C) 2014 Bruno Prémont <bonbons@linux-vserver.org>
   7  */
   8
   9 #include <linux/bitops.h>
  10 #include <linux/device.h>
  11 #include <linux/devm-helpers.h>
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel.h>
  15 #include <linux/mfd/axp20x.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/pm.h>
  20 #include <linux/power_supply.h>
  21 #include <linux/regmap.h>
  22 #include <linux/slab.h>
  23 #include <linux/iio/consumer.h>
  24 #include <linux/workqueue.h>
  25
  26 #define DRVNAME "axp20x-usb-power-supply"
  27
  28 #define AXP192_USB_OTG_STATUS           0x04
  29
  30 #define AXP20X_PWR_STATUS_VBUS_PRESENT  BIT(5)
  31 #define AXP20X_PWR_STATUS_VBUS_USED     BIT(4)
  32
  33 #define AXP20X_USB_STATUS_VBUS_VALID    BIT(2)
  34
  35 #define AXP20X_VBUS_VHOLD_uV(b)         (4000000 + (((b) >> 3) & 7) * 100000)
  36 #define AXP20X_VBUS_VHOLD_MASK          GENMASK(5, 3)
  37 #define AXP20X_VBUS_VHOLD_OFFSET        3
  38
  39 #define AXP20X_ADC_EN1_VBUS_CURR        BIT(2)
  40 #define AXP20X_ADC_EN1_VBUS_VOLT        BIT(3)
  41
  42 /*
  43  * Note do not raise the debounce time, we must report Vusb high within
  44  * 100ms otherwise we get Vbus errors in musb.
  45  */
  46 #define DEBOUNCE_TIME                   msecs_to_jiffies(50)
  47
  48 struct axp_data {
  49         const struct power_supply_desc  *power_desc;
  50         const char * const              *irq_names;
  51         unsigned int                    num_irq_names;
  52         const int                       *curr_lim_table;
  53         int                             curr_lim_table_size;
  54         struct reg_field                curr_lim_fld;
  55         struct reg_field                vbus_valid_bit;
  56         struct reg_field                vbus_mon_bit;
  57         struct reg_field                usb_bc_en_bit;
  58         struct reg_field                usb_bc_det_fld;
  59         struct reg_field                vbus_disable_bit;
  60         bool                            vbus_needs_polling: 1;
  61 };
  62
  63 struct axp20x_usb_power {
  64         struct device *dev;
  65         struct regmap *regmap;
  66         struct regmap_field *curr_lim_fld;
  67         struct regmap_field *vbus_valid_bit;
  68         struct regmap_field *vbus_mon_bit;
  69         struct regmap_field *usb_bc_en_bit;
  70         struct regmap_field *usb_bc_det_fld;
  71         struct regmap_field *vbus_disable_bit;
  72         struct power_supply *supply;
  73         const struct axp_data *axp_data;
  74         struct iio_channel *vbus_v;
  75         struct iio_channel *vbus_i;
  76         struct delayed_work vbus_detect;
  77         unsigned int old_status;
  78         unsigned int online;
  79         unsigned int num_irqs;
  80         unsigned int irqs[] __counted_by(num_irqs);
  81 };
  82
  83 static bool axp20x_usb_vbus_needs_polling(struct axp20x_usb_power *power)
  84 {
  85         /*
  86          * Polling is only necessary while VBUS is offline. While online, a
  87          * present->absent transition implies an online->offline transition
  88          * and will trigger the VBUS_REMOVAL IRQ.
  89          */
  90         if (power->axp_data->vbus_needs_polling && !power->online)
  91                 return true;
  92
  93         return false;
  94 }
  95
  96 static irqreturn_t axp20x_usb_power_irq(int irq, void *devid)
  97 {
  98         struct axp20x_usb_power *power = devid;
  99
 100         power_supply_changed(power->supply);
 101
 102         mod_delayed_work(system_power_efficient_wq, &power->vbus_detect, DEBOUNCE_TIME);
 103
 104         return IRQ_HANDLED;
 105 }
 106
 107 static void axp20x_usb_power_poll_vbus(struct work_struct *work)
 108 {
 109         struct axp20x_usb_power *power =
 110                 container_of(work, struct axp20x_usb_power, vbus_detect.work);
 111         unsigned int val;
 112         int ret;
 113
 114         ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &val);
 115         if (ret)
 116                 goto out;
 117
 118         val &= (AXP20X_PWR_STATUS_VBUS_PRESENT | AXP20X_PWR_STATUS_VBUS_USED);
 119         if (val != power->old_status)
 120                 power_supply_changed(power->supply);
 121
 122         if (power->usb_bc_en_bit && (val & AXP20X_PWR_STATUS_VBUS_PRESENT) !=
 123                 (power->old_status & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
 124                 dev_dbg(power->dev, "Cable status changed, re-enabling USB BC");
 125                 ret = regmap_field_write(power->usb_bc_en_bit, 1);
 126                 if (ret)
 127                         dev_err(power->dev, "failed to enable USB BC: errno %d",
 128                                 ret);
 129         }
 130
 131         power->old_status = val;
 132         power->online = val & AXP20X_PWR_STATUS_VBUS_USED;
 133
 134 out:
 135         if (axp20x_usb_vbus_needs_polling(power))
 136                 mod_delayed_work(system_power_efficient_wq, &power->vbus_detect, DEBOUNCE_TIME);
 137 }
 138
 139 static int axp20x_get_usb_type(struct axp20x_usb_power *power,
 140                                union power_supply_propval *val)
 141 {
 142         unsigned int reg;
 143         int ret;
 144
 145         if (!power->usb_bc_det_fld)
 146                 return -EINVAL;
 147
 148         ret = regmap_field_read(power->usb_bc_det_fld, &reg);
 149         if (ret)
 150                 return ret;
 151
 152         switch (reg) {
 153         case 1:
 154                 val->intval = POWER_SUPPLY_USB_TYPE_SDP;
 155                 break;
 156         case 2:
 157                 val->intval = POWER_SUPPLY_USB_TYPE_CDP;
 158                 break;
 159         case 3:
 160                 val->intval = POWER_SUPPLY_USB_TYPE_DCP;
 161                 break;
 162         default:
 163                 val->intval = POWER_SUPPLY_USB_TYPE_UNKNOWN;
 164                 break;
 165         }
 166
 167         return 0;
 168 }
 169
 170 static int axp20x_usb_power_get_property(struct power_supply *psy,
 171         enum power_supply_property psp, union power_supply_propval *val)
 172 {
 173         struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
 174         unsigned int input, v;
 175         int ret;
 176
 177         switch (psp) {
 178         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 179                 ret = regmap_read(power->regmap, AXP20X_VBUS_IPSOUT_MGMT, &v);
 180                 if (ret)
 181                         return ret;
 182
 183                 val->intval = AXP20X_VBUS_VHOLD_uV(v);
 184                 return 0;
 185         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 186                 if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
 187                         ret = iio_read_channel_processed(power->vbus_v,
 188                                                          &val->intval);
 189                         if (ret)
 190                                 return ret;
 191
 192                         /*
 193                          * IIO framework gives mV but Power Supply framework
 194                          * gives uV.
 195                          */
 196                         val->intval *= 1000;
 197                         return 0;
 198                 }
 199
 200                 ret = axp20x_read_variable_width(power->regmap,
 201                                                  AXP20X_VBUS_V_ADC_H, 12);
 202                 if (ret < 0)
 203                         return ret;
 204
 205                 val->intval = ret * 1700; /* 1 step = 1.7 mV */
 206                 return 0;
 207         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 208                 ret = regmap_field_read(power->curr_lim_fld, &v);
 209                 if (ret)
 210                         return ret;
 211
 212                 if (v < power->axp_data->curr_lim_table_size)
 213                         val->intval = power->axp_data->curr_lim_table[v];
 214                 else
 215                         val->intval = power->axp_data->curr_lim_table[
 216                                 power->axp_data->curr_lim_table_size - 1];
 217                 return 0;
 218         case POWER_SUPPLY_PROP_CURRENT_NOW:
 219                 if (IS_ENABLED(CONFIG_AXP20X_ADC)) {
 220                         ret = iio_read_channel_processed(power->vbus_i,
 221                                                          &val->intval);
 222                         if (ret)
 223                                 return ret;
 224
 225                         /*
 226                          * IIO framework gives mA but Power Supply framework
 227                          * gives uA.
 228                          */
 229                         val->intval *= 1000;
 230                         return 0;
 231                 }
 232
 233                 ret = axp20x_read_variable_width(power->regmap,
 234                                                  AXP20X_VBUS_I_ADC_H, 12);
 235                 if (ret < 0)
 236                         return ret;
 237
 238                 val->intval = ret * 375; /* 1 step = 0.375 mA */
 239                 return 0;
 240
 241         case POWER_SUPPLY_PROP_USB_TYPE:
 242                 return axp20x_get_usb_type(power, val);
 243         default:
 244                 break;
 245         }
 246
 247         /* All the properties below need the input-status reg value */
 248         ret = regmap_read(power->regmap, AXP20X_PWR_INPUT_STATUS, &input);
 249         if (ret)
 250                 return ret;
 251
 252         switch (psp) {
 253         case POWER_SUPPLY_PROP_HEALTH:
 254                 if (!(input & AXP20X_PWR_STATUS_VBUS_PRESENT)) {
 255                         val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
 256                         break;
 257                 }
 258
 259                 val->intval = POWER_SUPPLY_HEALTH_GOOD;
 260
 261                 if (power->vbus_valid_bit) {
 262                         ret = regmap_field_read(power->vbus_valid_bit, &v);
 263                         if (ret)
 264                                 return ret;
 265
 266                         if (v == 0)
 267                                 val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
 268                 }
 269
 270                 break;
 271         case POWER_SUPPLY_PROP_PRESENT:
 272                 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_PRESENT);
 273                 break;
 274         case POWER_SUPPLY_PROP_ONLINE:
 275                 val->intval = !!(input & AXP20X_PWR_STATUS_VBUS_USED);
 276                 break;
 277         default:
 278                 return -EINVAL;
 279         }
 280
 281         return 0;
 282 }
 283
 284 static int axp20x_usb_power_set_voltage_min(struct axp20x_usb_power *power,
 285                                             int intval)
 286 {
 287         int val;
 288
 289         switch (intval) {
 290         case 4000000:
 291         case 4100000:
 292         case 4200000:
 293         case 4300000:
 294         case 4400000:
 295         case 4500000:
 296         case 4600000:
 297         case 4700000:
 298                 val = (intval - 4000000) / 100000;
 299                 return regmap_update_bits(power->regmap,
 300                                           AXP20X_VBUS_IPSOUT_MGMT,
 301                                           AXP20X_VBUS_VHOLD_MASK,
 302                                           val << AXP20X_VBUS_VHOLD_OFFSET);
 303         default:
 304                 return -EINVAL;
 305         }
 306
 307         return -EINVAL;
 308 }
 309
 310 static int axp20x_usb_power_set_input_current_limit(struct axp20x_usb_power *power,
 311                                                     int intval)
 312 {
 313         int ret;
 314         unsigned int reg;
 315         const unsigned int max = power->axp_data->curr_lim_table_size;
 316
 317         if (intval == -1)
 318                 return -EINVAL;
 319
 320         /*
 321          * BC1.2 detection can cause a race condition if we try to set a current
 322          * limit while it's in progress. When it finishes it will overwrite the
 323          * current limit we just set.
 324          */
 325         if (power->usb_bc_en_bit) {
 326                 dev_dbg(power->dev,
 327                         "disabling BC1.2 detection because current limit was set");
 328                 ret = regmap_field_write(power->usb_bc_en_bit, 0);
 329                 if (ret)
 330                         return ret;
 331         }
 332
 333         for (reg = max - 1; reg > 0; reg--)
 334                 if (power->axp_data->curr_lim_table[reg] <= intval)
 335                         break;
 336
 337         dev_dbg(power->dev, "setting input current limit reg to %d (%d uA), requested %d uA",
 338                 reg, power->axp_data->curr_lim_table[reg], intval);
 339
 340         return regmap_field_write(power->curr_lim_fld, reg);
 341 }
 342
 343 static int axp20x_usb_power_set_property(struct power_supply *psy,
 344                                          enum power_supply_property psp,
 345                                          const union power_supply_propval *val)
 346 {
 347         struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
 348
 349         switch (psp) {
 350         case POWER_SUPPLY_PROP_ONLINE:
 351                 if (!power->vbus_disable_bit)
 352                         return -EINVAL;
 353
 354                 return regmap_field_write(power->vbus_disable_bit, !val->intval);
 355
 356         case POWER_SUPPLY_PROP_VOLTAGE_MIN:
 357                 return axp20x_usb_power_set_voltage_min(power, val->intval);
 358
 359         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 360                 return axp20x_usb_power_set_input_current_limit(power, val->intval);
 361
 362         default:
 363                 return -EINVAL;
 364         }
 365
 366         return -EINVAL;
 367 }
 368
 369 static int axp20x_usb_power_prop_writeable(struct power_supply *psy,
 370                                            enum power_supply_property psp)
 371 {
 372         struct axp20x_usb_power *power = power_supply_get_drvdata(psy);
 373
 374         /*
 375          * The VBUS path select flag works differently on AXP288 and newer:
 376          *  - On AXP20x and AXP22x, the flag enables VBUS (ignoring N_VBUSEN).
 377          *  - On AXP288 and AXP8xx, the flag disables VBUS (ignoring N_VBUSEN).
 378          * We only expose the control on variants where it can be used to force
 379          * the VBUS input offline.
 380          */
 381         if (psp == POWER_SUPPLY_PROP_ONLINE)
 382                 return power->vbus_disable_bit != NULL;
 383
 384         return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN ||
 385                psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT;
 386 }
 387
 388 static enum power_supply_property axp20x_usb_power_properties[] = {
 389         POWER_SUPPLY_PROP_HEALTH,
 390         POWER_SUPPLY_PROP_PRESENT,
 391         POWER_SUPPLY_PROP_ONLINE,
 392         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 393         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 394         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 395         POWER_SUPPLY_PROP_CURRENT_NOW,
 396 };
 397
 398 static enum power_supply_property axp22x_usb_power_properties[] = {
 399         POWER_SUPPLY_PROP_HEALTH,
 400         POWER_SUPPLY_PROP_PRESENT,
 401         POWER_SUPPLY_PROP_ONLINE,
 402         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 403         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 404 };
 405
 406 static enum power_supply_property axp813_usb_power_properties[] = {
 407         POWER_SUPPLY_PROP_HEALTH,
 408         POWER_SUPPLY_PROP_PRESENT,
 409         POWER_SUPPLY_PROP_ONLINE,
 410         POWER_SUPPLY_PROP_VOLTAGE_MIN,
 411         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
 412         POWER_SUPPLY_PROP_USB_TYPE,
 413 };
 414
 415 static enum power_supply_usb_type axp813_usb_types[] = {
 416         POWER_SUPPLY_USB_TYPE_SDP,
 417         POWER_SUPPLY_USB_TYPE_DCP,
 418         POWER_SUPPLY_USB_TYPE_CDP,
 419         POWER_SUPPLY_USB_TYPE_UNKNOWN,
 420 };
 421
 422 static const struct power_supply_desc axp20x_usb_power_desc = {
 423         .name = "axp20x-usb",
 424         .type = POWER_SUPPLY_TYPE_USB,
 425         .properties = axp20x_usb_power_properties,
 426         .num_properties = ARRAY_SIZE(axp20x_usb_power_properties),
 427         .property_is_writeable = axp20x_usb_power_prop_writeable,
 428         .get_property = axp20x_usb_power_get_property,
 429         .set_property = axp20x_usb_power_set_property,
 430 };
 431
 432 static const struct power_supply_desc axp22x_usb_power_desc = {
 433         .name = "axp20x-usb",
 434         .type = POWER_SUPPLY_TYPE_USB,
 435         .properties = axp22x_usb_power_properties,
 436         .num_properties = ARRAY_SIZE(axp22x_usb_power_properties),
 437         .property_is_writeable = axp20x_usb_power_prop_writeable,
 438         .get_property = axp20x_usb_power_get_property,
 439         .set_property = axp20x_usb_power_set_property,
 440 };
 441
 442 static const struct power_supply_desc axp813_usb_power_desc = {
 443         .name = "axp20x-usb",
 444         .type = POWER_SUPPLY_TYPE_USB,
 445         .properties = axp813_usb_power_properties,
 446         .num_properties = ARRAY_SIZE(axp813_usb_power_properties),
 447         .property_is_writeable = axp20x_usb_power_prop_writeable,
 448         .get_property = axp20x_usb_power_get_property,
 449         .set_property = axp20x_usb_power_set_property,
 450         .usb_types = axp813_usb_types,
 451         .num_usb_types = ARRAY_SIZE(axp813_usb_types),
 452 };
 453
 454 static const char * const axp20x_irq_names[] = {
 455         "VBUS_PLUGIN",
 456         "VBUS_REMOVAL",
 457         "VBUS_VALID",
 458         "VBUS_NOT_VALID",
 459 };
 460
 461 static const char * const axp22x_irq_names[] = {
 462         "VBUS_PLUGIN",
 463         "VBUS_REMOVAL",
 464 };
 465
 466 static int axp192_usb_curr_lim_table[] = {
 467         -1,
 468         -1,
 469         500000,
 470         100000,
 471 };
 472
 473 static int axp20x_usb_curr_lim_table[] = {
 474         900000,
 475         500000,
 476         100000,
 477         -1,
 478 };
 479
 480 static int axp221_usb_curr_lim_table[] = {
 481         900000,
 482         500000,
 483         -1,
 484         -1,
 485 };
 486
 487 static int axp813_usb_curr_lim_table[] = {
 488         100000,
 489         500000,
 490         900000,
 491         1500000,
 492         2000000,
 493         2500000,
 494         3000000,
 495         3500000,
 496         4000000,
 497 };
 498
 499 static const struct axp_data axp192_data = {
 500         .power_desc     = &axp20x_usb_power_desc,
 501         .irq_names      = axp20x_irq_names,
 502         .num_irq_names  = ARRAY_SIZE(axp20x_irq_names),
 503         .curr_lim_table = axp192_usb_curr_lim_table,
 504         .curr_lim_table_size = ARRAY_SIZE(axp192_usb_curr_lim_table),
 505         .curr_lim_fld   = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 0, 1),
 506         .vbus_valid_bit = REG_FIELD(AXP192_USB_OTG_STATUS, 2, 2),
 507         .vbus_mon_bit   = REG_FIELD(AXP20X_VBUS_MON, 3, 3),
 508 };
 509
 510 static const struct axp_data axp202_data = {
 511         .power_desc     = &axp20x_usb_power_desc,
 512         .irq_names      = axp20x_irq_names,
 513         .num_irq_names  = ARRAY_SIZE(axp20x_irq_names),
 514         .curr_lim_table = axp20x_usb_curr_lim_table,
 515         .curr_lim_table_size = ARRAY_SIZE(axp20x_usb_curr_lim_table),
 516         .curr_lim_fld   = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 0, 1),
 517         .vbus_valid_bit = REG_FIELD(AXP20X_USB_OTG_STATUS, 2, 2),
 518         .vbus_mon_bit   = REG_FIELD(AXP20X_VBUS_MON, 3, 3),
 519 };
 520
 521 static const struct axp_data axp221_data = {
 522         .power_desc     = &axp22x_usb_power_desc,
 523         .irq_names      = axp22x_irq_names,
 524         .num_irq_names  = ARRAY_SIZE(axp22x_irq_names),
 525         .curr_lim_table = axp221_usb_curr_lim_table,
 526         .curr_lim_table_size = ARRAY_SIZE(axp221_usb_curr_lim_table),
 527         .curr_lim_fld   = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 0, 1),
 528         .vbus_needs_polling = true,
 529 };
 530
 531 static const struct axp_data axp223_data = {
 532         .power_desc     = &axp22x_usb_power_desc,
 533         .irq_names      = axp22x_irq_names,
 534         .num_irq_names  = ARRAY_SIZE(axp22x_irq_names),
 535         .curr_lim_table = axp20x_usb_curr_lim_table,
 536         .curr_lim_table_size = ARRAY_SIZE(axp20x_usb_curr_lim_table),
 537         .curr_lim_fld   = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 0, 1),
 538         .vbus_needs_polling = true,
 539 };
 540
 541 static const struct axp_data axp813_data = {
 542         .power_desc     = &axp813_usb_power_desc,
 543         .irq_names      = axp22x_irq_names,
 544         .num_irq_names  = ARRAY_SIZE(axp22x_irq_names),
 545         .curr_lim_table = axp813_usb_curr_lim_table,
 546         .curr_lim_table_size = ARRAY_SIZE(axp813_usb_curr_lim_table),
 547         .curr_lim_fld   = REG_FIELD(AXP22X_CHRG_CTRL3, 4, 7),
 548         .usb_bc_en_bit  = REG_FIELD(AXP288_BC_GLOBAL, 0, 0),
 549         .usb_bc_det_fld = REG_FIELD(AXP288_BC_DET_STAT, 5, 7),
 550         .vbus_disable_bit = REG_FIELD(AXP20X_VBUS_IPSOUT_MGMT, 7, 7),
 551         .vbus_needs_polling = true,
 552 };
 553
 554 #ifdef CONFIG_PM_SLEEP
 555 static int axp20x_usb_power_suspend(struct device *dev)
 556 {
 557         struct axp20x_usb_power *power = dev_get_drvdata(dev);
 558         int i = 0;
 559
 560         /*
 561          * Allow wake via VBUS_PLUGIN only.
 562          *
 563          * As nested threaded IRQs are not automatically disabled during
 564          * suspend, we must explicitly disable the remainder of the IRQs.
 565          */
 566         if (device_may_wakeup(&power->supply->dev))
 567                 enable_irq_wake(power->irqs[i++]);
 568         while (i < power->num_irqs)
 569                 disable_irq(power->irqs[i++]);
 570
 571         return 0;
 572 }
 573
 574 static int axp20x_usb_power_resume(struct device *dev)
 575 {
 576         struct axp20x_usb_power *power = dev_get_drvdata(dev);
 577         int i = 0;
 578
 579         if (device_may_wakeup(&power->supply->dev))
 580                 disable_irq_wake(power->irqs[i++]);
 581         while (i < power->num_irqs)
 582                 enable_irq(power->irqs[i++]);
 583
 584         mod_delayed_work(system_power_efficient_wq, &power->vbus_detect, DEBOUNCE_TIME);
 585
 586         return 0;
 587 }
 588 #endif
 589
 590 static SIMPLE_DEV_PM_OPS(axp20x_usb_power_pm_ops, axp20x_usb_power_suspend,
 591                                                   axp20x_usb_power_resume);
 592
 593 static int configure_iio_channels(struct platform_device *pdev,
 594                                   struct axp20x_usb_power *power)
 595 {
 596         power->vbus_v = devm_iio_channel_get(&pdev->dev, "vbus_v");
 597         if (IS_ERR(power->vbus_v)) {
 598                 if (PTR_ERR(power->vbus_v) == -ENODEV)
 599                         return -EPROBE_DEFER;
 600                 return PTR_ERR(power->vbus_v);
 601         }
 602
 603         power->vbus_i = devm_iio_channel_get(&pdev->dev, "vbus_i");
 604         if (IS_ERR(power->vbus_i)) {
 605                 if (PTR_ERR(power->vbus_i) == -ENODEV)
 606                         return -EPROBE_DEFER;
 607                 return PTR_ERR(power->vbus_i);
 608         }
 609
 610         return 0;
 611 }
 612
 613 static int configure_adc_registers(struct axp20x_usb_power *power)
 614 {
 615         /* Enable vbus voltage and current measurement */
 616         return regmap_update_bits(power->regmap, AXP20X_ADC_EN1,
 617                                   AXP20X_ADC_EN1_VBUS_CURR |
 618                                   AXP20X_ADC_EN1_VBUS_VOLT,
 619                                   AXP20X_ADC_EN1_VBUS_CURR |
 620                                   AXP20X_ADC_EN1_VBUS_VOLT);
 621 }
 622
 623 static int axp20x_regmap_field_alloc_optional(struct device *dev,
 624                                               struct regmap *regmap,
 625                                               struct reg_field fdesc,
 626                                               struct regmap_field **fieldp)
 627 {
 628         struct regmap_field *field;
 629
 630         if (fdesc.reg == 0) {
 631                 *fieldp = NULL;
 632                 return 0;
 633         }
 634
 635         field = devm_regmap_field_alloc(dev, regmap, fdesc);
 636         if (IS_ERR(field))
 637                 return PTR_ERR(field);
 638
 639         *fieldp = field;
 640         return 0;
 641 }
 642
 643 static int axp20x_usb_power_probe(struct platform_device *pdev)
 644 {
 645         struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
 646         struct power_supply_config psy_cfg = {};
 647         struct axp20x_usb_power *power;
 648         const struct axp_data *axp_data;
 649         int i, irq, ret;
 650
 651         if (!of_device_is_available(pdev->dev.of_node))
 652                 return -ENODEV;
 653
 654         if (!axp20x) {
 655                 dev_err(&pdev->dev, "Parent drvdata not set\n");
 656                 return -EINVAL;
 657         }
 658
 659         axp_data = of_device_get_match_data(&pdev->dev);
 660
 661         power = devm_kzalloc(&pdev->dev,
 662                              struct_size(power, irqs, axp_data->num_irq_names),
 663                              GFP_KERNEL);
 664         if (!power)
 665                 return -ENOMEM;
 666
 667         platform_set_drvdata(pdev, power);
 668
 669         power->dev = &pdev->dev;
 670         power->axp_data = axp_data;
 671         power->regmap = axp20x->regmap;
 672         power->num_irqs = axp_data->num_irq_names;
 673
 674         power->curr_lim_fld = devm_regmap_field_alloc(&pdev->dev, power->regmap,
 675                                                       axp_data->curr_lim_fld);
 676         if (IS_ERR(power->curr_lim_fld))
 677                 return PTR_ERR(power->curr_lim_fld);
 678
 679         ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap,
 680                                                  axp_data->vbus_valid_bit,
 681                                                  &power->vbus_valid_bit);
 682         if (ret)
 683                 return ret;
 684
 685         ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap,
 686                                                  axp_data->vbus_mon_bit,
 687                                                  &power->vbus_mon_bit);
 688         if (ret)
 689                 return ret;
 690
 691         ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap,
 692                                                  axp_data->usb_bc_en_bit,
 693                                                  &power->usb_bc_en_bit);
 694         if (ret)
 695                 return ret;
 696
 697         ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap,
 698                                                  axp_data->usb_bc_det_fld,
 699                                                  &power->usb_bc_det_fld);
 700         if (ret)
 701                 return ret;
 702
 703         ret = axp20x_regmap_field_alloc_optional(&pdev->dev, power->regmap,
 704                                                  axp_data->vbus_disable_bit,
 705                                                  &power->vbus_disable_bit);
 706         if (ret)
 707                 return ret;
 708
 709         ret = devm_delayed_work_autocancel(&pdev->dev, &power->vbus_detect,
 710                                            axp20x_usb_power_poll_vbus);
 711         if (ret)
 712                 return ret;
 713
 714         if (power->vbus_mon_bit) {
 715                 /* Enable vbus valid checking */
 716                 ret = regmap_field_write(power->vbus_mon_bit, 1);
 717                 if (ret)
 718                         return ret;
 719
 720                 if (IS_ENABLED(CONFIG_AXP20X_ADC))
 721                         ret = configure_iio_channels(pdev, power);
 722                 else
 723                         ret = configure_adc_registers(power);
 724
 725                 if (ret)
 726                         return ret;
 727         }
 728
 729         if (power->usb_bc_en_bit) {
 730                 /* Enable USB Battery Charging specification detection */
 731                 ret = regmap_field_write(power->usb_bc_en_bit, 1);
 732                 if (ret)
 733                         return ret;
 734         }
 735
 736         psy_cfg.of_node = pdev->dev.of_node;
 737         psy_cfg.drv_data = power;
 738
 739         power->supply = devm_power_supply_register(&pdev->dev,
 740                                                    axp_data->power_desc,
 741                                                    &psy_cfg);
 742         if (IS_ERR(power->supply))
 743                 return PTR_ERR(power->supply);
 744
 745         /* Request irqs after registering, as irqs may trigger immediately */
 746         for (i = 0; i < axp_data->num_irq_names; i++) {
 747                 irq = platform_get_irq_byname(pdev, axp_data->irq_names[i]);
 748                 if (irq < 0)
 749                         return irq;
 750
 751                 power->irqs[i] = regmap_irq_get_virq(axp20x->regmap_irqc, irq);
 752                 ret = devm_request_any_context_irq(&pdev->dev, power->irqs[i],
 753                                                    axp20x_usb_power_irq, 0,
 754                                                    DRVNAME, power);
 755                 if (ret < 0) {
 756                         dev_err(&pdev->dev, "Error requesting %s IRQ: %d\n",
 757                                 axp_data->irq_names[i], ret);
 758                         return ret;
 759                 }
 760         }
 761
 762         if (axp20x_usb_vbus_needs_polling(power))
 763                 queue_delayed_work(system_power_efficient_wq, &power->vbus_detect, 0);
 764
 765         return 0;
 766 }
 767
 768 static const struct of_device_id axp20x_usb_power_match[] = {
 769         {
 770                 .compatible = "x-powers,axp192-usb-power-supply",
 771                 .data = &axp192_data,
 772         }, {
 773                 .compatible = "x-powers,axp202-usb-power-supply",
 774                 .data = &axp202_data,
 775         }, {
 776                 .compatible = "x-powers,axp221-usb-power-supply",
 777                 .data = &axp221_data,
 778         }, {
 779                 .compatible = "x-powers,axp223-usb-power-supply",
 780                 .data = &axp223_data,
 781         }, {
 782                 .compatible = "x-powers,axp813-usb-power-supply",
 783                 .data = &axp813_data,
 784         }, { /* sentinel */ }
 785 };
 786 MODULE_DEVICE_TABLE(of, axp20x_usb_power_match);
 787
 788 static struct platform_driver axp20x_usb_power_driver = {
 789         .probe = axp20x_usb_power_probe,
 790         .driver = {
 791                 .name           = DRVNAME,
 792                 .of_match_table = axp20x_usb_power_match,
 793                 .pm             = &axp20x_usb_power_pm_ops,
 794         },
 795 };
 796
 797 module_platform_driver(axp20x_usb_power_driver);
 798
 799 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 800 MODULE_DESCRIPTION("AXP20x PMIC USB power supply status driver");
 801 MODULE_LICENSE("GPL");