drivers/power/supply/cros_usbpd-charger.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Power supply driver for ChromeOS EC based USB PD Charger.
   4  *
   5  * Copyright (c) 2014 - 2018 Google, Inc
   6  */
   7
   8 #include <linux/mfd/cros_ec.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_data/cros_ec_commands.h>
  11 #include <linux/platform_data/cros_ec_proto.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/power_supply.h>
  14 #include <linux/slab.h>
  15
  16 #define CHARGER_USBPD_DIR_NAME                  "CROS_USBPD_CHARGER%d"
  17 #define CHARGER_DEDICATED_DIR_NAME              "CROS_DEDICATED_CHARGER"
  18 #define CHARGER_DIR_NAME_LENGTH         (sizeof(CHARGER_USBPD_DIR_NAME) >= \
  19                                          sizeof(CHARGER_DEDICATED_DIR_NAME) ? \
  20                                          sizeof(CHARGER_USBPD_DIR_NAME) : \
  21                                          sizeof(CHARGER_DEDICATED_DIR_NAME))
  22 #define CHARGER_CACHE_UPDATE_DELAY              msecs_to_jiffies(500)
  23 #define CHARGER_MANUFACTURER_MODEL_LENGTH       32
  24
  25 #define DRV_NAME "cros-usbpd-charger"
  26
  27 struct port_data {
  28         int port_number;
  29         char name[CHARGER_DIR_NAME_LENGTH];
  30         char manufacturer[CHARGER_MANUFACTURER_MODEL_LENGTH];
  31         char model_name[CHARGER_MANUFACTURER_MODEL_LENGTH];
  32         struct power_supply *psy;
  33         struct power_supply_desc psy_desc;
  34         int psy_usb_type;
  35         int psy_online;
  36         int psy_status;
  37         int psy_current_max;
  38         int psy_voltage_max_design;
  39         int psy_voltage_now;
  40         int psy_power_max;
  41         struct charger_data *charger;
  42         unsigned long last_update;
  43 };
  44
  45 struct charger_data {
  46         struct device *dev;
  47         struct cros_ec_dev *ec_dev;
  48         struct cros_ec_device *ec_device;
  49         int num_charger_ports;
  50         int num_usbpd_ports;
  51         int num_registered_psy;
  52         struct port_data *ports[EC_USB_PD_MAX_PORTS];
  53         struct notifier_block notifier;
  54 };
  55
  56 static enum power_supply_property cros_usbpd_charger_props[] = {
  57         POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
  58         POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
  59         POWER_SUPPLY_PROP_ONLINE,
  60         POWER_SUPPLY_PROP_STATUS,
  61         POWER_SUPPLY_PROP_CURRENT_MAX,
  62         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
  63         POWER_SUPPLY_PROP_VOLTAGE_NOW,
  64         POWER_SUPPLY_PROP_MODEL_NAME,
  65         POWER_SUPPLY_PROP_MANUFACTURER,
  66         POWER_SUPPLY_PROP_USB_TYPE
  67 };
  68
  69 static enum power_supply_property cros_usbpd_dedicated_charger_props[] = {
  70         POWER_SUPPLY_PROP_ONLINE,
  71         POWER_SUPPLY_PROP_STATUS,
  72         POWER_SUPPLY_PROP_VOLTAGE_NOW,
  73 };
  74
  75 static enum power_supply_usb_type cros_usbpd_charger_usb_types[] = {
  76         POWER_SUPPLY_USB_TYPE_UNKNOWN,
  77         POWER_SUPPLY_USB_TYPE_SDP,
  78         POWER_SUPPLY_USB_TYPE_DCP,
  79         POWER_SUPPLY_USB_TYPE_CDP,
  80         POWER_SUPPLY_USB_TYPE_C,
  81         POWER_SUPPLY_USB_TYPE_PD,
  82         POWER_SUPPLY_USB_TYPE_PD_DRP,
  83         POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID
  84 };
  85
  86 /* Input voltage/current limit in mV/mA. Default to none. */
  87 static u16 input_voltage_limit = EC_POWER_LIMIT_NONE;
  88 static u16 input_current_limit = EC_POWER_LIMIT_NONE;
  89
  90 static bool cros_usbpd_charger_port_is_dedicated(struct port_data *port)
  91 {
  92         return port->port_number >= port->charger->num_usbpd_ports;
  93 }
  94
  95 static int cros_usbpd_charger_ec_command(struct charger_data *charger,
  96                                          unsigned int version,
  97                                          unsigned int command,
  98                                          void *outdata,
  99                                          unsigned int outsize,
 100                                          void *indata,
 101                                          unsigned int insize)
 102 {
 103         struct cros_ec_dev *ec_dev = charger->ec_dev;
 104         struct cros_ec_command *msg;
 105         int ret;
 106
 107         msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
 108         if (!msg)
 109                 return -ENOMEM;
 110
 111         msg->version = version;
 112         msg->command = ec_dev->cmd_offset + command;
 113         msg->outsize = outsize;
 114         msg->insize = insize;
 115
 116         if (outsize)
 117                 memcpy(msg->data, outdata, outsize);
 118
 119         ret = cros_ec_cmd_xfer_status(charger->ec_device, msg);
 120         if (ret >= 0 && insize)
 121                 memcpy(indata, msg->data, insize);
 122
 123         kfree(msg);
 124         return ret;
 125 }
 126
 127 static int cros_usbpd_charger_get_num_ports(struct charger_data *charger)
 128 {
 129         struct ec_response_charge_port_count resp;
 130         int ret;
 131
 132         ret = cros_usbpd_charger_ec_command(charger, 0,
 133                                             EC_CMD_CHARGE_PORT_COUNT,
 134                                             NULL, 0, &resp, sizeof(resp));
 135         if (ret < 0) {
 136                 dev_err(charger->dev,
 137                         "Unable to get the number of ports (err:0x%x)\n", ret);
 138                 return ret;
 139         }
 140
 141         return resp.port_count;
 142 }
 143
 144 static int cros_usbpd_charger_get_usbpd_num_ports(struct charger_data *charger)
 145 {
 146         struct ec_response_usb_pd_ports resp;
 147         int ret;
 148
 149         ret = cros_usbpd_charger_ec_command(charger, 0, EC_CMD_USB_PD_PORTS,
 150                                             NULL, 0, &resp, sizeof(resp));
 151         if (ret < 0) {
 152                 dev_err(charger->dev,
 153                         "Unable to get the number or ports (err:0x%x)\n", ret);
 154                 return ret;
 155         }
 156
 157         return resp.num_ports;
 158 }
 159
 160 static int cros_usbpd_charger_get_discovery_info(struct port_data *port)
 161 {
 162         struct charger_data *charger = port->charger;
 163         struct ec_params_usb_pd_discovery_entry resp;
 164         struct ec_params_usb_pd_info_request req;
 165         int ret;
 166
 167         req.port = port->port_number;
 168
 169         ret = cros_usbpd_charger_ec_command(charger, 0,
 170                                             EC_CMD_USB_PD_DISCOVERY,
 171                                             &req, sizeof(req),
 172                                             &resp, sizeof(resp));
 173         if (ret < 0) {
 174                 dev_err(charger->dev,
 175                         "Unable to query discovery info (err:0x%x)\n", ret);
 176                 return ret;
 177         }
 178
 179         dev_dbg(charger->dev, "Port %d: VID = 0x%x, PID=0x%x, PTYPE=0x%x\n",
 180                 port->port_number, resp.vid, resp.pid, resp.ptype);
 181
 182         snprintf(port->manufacturer, sizeof(port->manufacturer), "%x",
 183                  resp.vid);
 184         snprintf(port->model_name, sizeof(port->model_name), "%x", resp.pid);
 185
 186         return 0;
 187 }
 188
 189 static int cros_usbpd_charger_get_power_info(struct port_data *port)
 190 {
 191         struct charger_data *charger = port->charger;
 192         struct ec_response_usb_pd_power_info resp;
 193         struct ec_params_usb_pd_power_info req;
 194         int last_psy_status, last_psy_usb_type;
 195         struct device *dev = charger->dev;
 196         int ret;
 197
 198         req.port = port->port_number;
 199         ret = cros_usbpd_charger_ec_command(charger, 0,
 200                                             EC_CMD_USB_PD_POWER_INFO,
 201                                             &req, sizeof(req),
 202                                             &resp, sizeof(resp));
 203         if (ret < 0) {
 204                 dev_err(dev, "Unable to query PD power info (err:0x%x)\n", ret);
 205                 return ret;
 206         }
 207
 208         last_psy_status = port->psy_status;
 209         last_psy_usb_type = port->psy_usb_type;
 210
 211         switch (resp.role) {
 212         case USB_PD_PORT_POWER_DISCONNECTED:
 213                 port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 214                 port->psy_online = 0;
 215                 break;
 216         case USB_PD_PORT_POWER_SOURCE:
 217                 port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 218                 port->psy_online = 0;
 219                 break;
 220         case USB_PD_PORT_POWER_SINK:
 221                 port->psy_status = POWER_SUPPLY_STATUS_CHARGING;
 222                 port->psy_online = 1;
 223                 break;
 224         case USB_PD_PORT_POWER_SINK_NOT_CHARGING:
 225                 port->psy_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
 226                 port->psy_online = 1;
 227                 break;
 228         default:
 229                 dev_err(dev, "Unknown role %d\n", resp.role);
 230                 break;
 231         }
 232
 233         port->psy_voltage_max_design = resp.meas.voltage_max;
 234         port->psy_voltage_now = resp.meas.voltage_now;
 235         port->psy_current_max = resp.meas.current_max;
 236         port->psy_power_max = resp.max_power;
 237
 238         switch (resp.type) {
 239         case USB_CHG_TYPE_BC12_SDP:
 240         case USB_CHG_TYPE_VBUS:
 241                 port->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP;
 242                 break;
 243         case USB_CHG_TYPE_NONE:
 244                 /*
 245                  * For dual-role devices when we are a source, the firmware
 246                  * reports the type as NONE. Report such chargers as type
 247                  * USB_PD_DRP.
 248                  */
 249                 if (resp.role == USB_PD_PORT_POWER_SOURCE && resp.dualrole)
 250                         port->psy_usb_type = POWER_SUPPLY_USB_TYPE_PD_DRP;
 251                 else
 252                         port->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP;
 253                 break;
 254         case USB_CHG_TYPE_OTHER:
 255         case USB_CHG_TYPE_PROPRIETARY:
 256                 port->psy_usb_type = POWER_SUPPLY_USB_TYPE_APPLE_BRICK_ID;
 257                 break;
 258         case USB_CHG_TYPE_C:
 259                 port->psy_usb_type = POWER_SUPPLY_USB_TYPE_C;
 260                 break;
 261         case USB_CHG_TYPE_BC12_DCP:
 262                 port->psy_usb_type = POWER_SUPPLY_USB_TYPE_DCP;
 263                 break;
 264         case USB_CHG_TYPE_BC12_CDP:
 265                 port->psy_usb_type = POWER_SUPPLY_USB_TYPE_CDP;
 266                 break;
 267         case USB_CHG_TYPE_PD:
 268                 if (resp.dualrole)
 269                         port->psy_usb_type = POWER_SUPPLY_USB_TYPE_PD_DRP;
 270                 else
 271                         port->psy_usb_type = POWER_SUPPLY_USB_TYPE_PD;
 272                 break;
 273         case USB_CHG_TYPE_UNKNOWN:
 274                 /*
 275                  * While the EC is trying to determine the type of charger that
 276                  * has been plugged in, it will report the charger type as
 277                  * unknown. Additionally since the power capabilities are
 278                  * unknown, report the max current and voltage as zero.
 279                  */
 280                 port->psy_usb_type = POWER_SUPPLY_USB_TYPE_UNKNOWN;
 281                 port->psy_voltage_max_design = 0;
 282                 port->psy_current_max = 0;
 283                 break;
 284         default:
 285                 dev_err(dev, "Port %d: default case!\n", port->port_number);
 286                 port->psy_usb_type = POWER_SUPPLY_USB_TYPE_SDP;
 287         }
 288
 289         if (cros_usbpd_charger_port_is_dedicated(port))
 290                 port->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
 291         else
 292                 port->psy_desc.type = POWER_SUPPLY_TYPE_USB;
 293
 294         dev_dbg(dev,
 295                 "Port %d: type=%d vmax=%d vnow=%d cmax=%d clim=%d pmax=%d\n",
 296                 port->port_number, resp.type, resp.meas.voltage_max,
 297                 resp.meas.voltage_now, resp.meas.current_max,
 298                 resp.meas.current_lim, resp.max_power);
 299
 300         /*
 301          * If power supply type or status changed, explicitly call
 302          * power_supply_changed. This results in udev event getting generated
 303          * and allows user mode apps to react quicker instead of waiting for
 304          * their next poll of power supply status.
 305          */
 306         if (last_psy_usb_type != port->psy_usb_type ||
 307             last_psy_status != port->psy_status)
 308                 power_supply_changed(port->psy);
 309
 310         return 0;
 311 }
 312
 313 static int cros_usbpd_charger_get_port_status(struct port_data *port,
 314                                               bool ratelimit)
 315 {
 316         int ret;
 317
 318         if (ratelimit &&
 319             time_is_after_jiffies(port->last_update +
 320                                   CHARGER_CACHE_UPDATE_DELAY))
 321                 return 0;
 322
 323         ret = cros_usbpd_charger_get_power_info(port);
 324         if (ret < 0)
 325                 return ret;
 326
 327         if (!cros_usbpd_charger_port_is_dedicated(port))
 328                 ret = cros_usbpd_charger_get_discovery_info(port);
 329         port->last_update = jiffies;
 330
 331         return ret;
 332 }
 333
 334 static int cros_usbpd_charger_set_ext_power_limit(struct charger_data *charger,
 335                                                   u16 current_lim,
 336                                                   u16 voltage_lim)
 337 {
 338         struct ec_params_external_power_limit_v1 req;
 339         int ret;
 340
 341         req.current_lim = current_lim;
 342         req.voltage_lim = voltage_lim;
 343
 344         ret = cros_usbpd_charger_ec_command(charger, 0,
 345                                             EC_CMD_EXTERNAL_POWER_LIMIT,
 346                                             &req, sizeof(req), NULL, 0);
 347         if (ret < 0)
 348                 dev_err(charger->dev,
 349                         "Unable to set the 'External Power Limit': %d\n", ret);
 350
 351         return ret;
 352 }
 353
 354 static void cros_usbpd_charger_power_changed(struct power_supply *psy)
 355 {
 356         struct port_data *port = power_supply_get_drvdata(psy);
 357         struct charger_data *charger = port->charger;
 358         int i;
 359
 360         for (i = 0; i < charger->num_registered_psy; i++)
 361                 cros_usbpd_charger_get_port_status(charger->ports[i], false);
 362 }
 363
 364 static int cros_usbpd_charger_get_prop(struct power_supply *psy,
 365                                        enum power_supply_property psp,
 366                                        union power_supply_propval *val)
 367 {
 368         struct port_data *port = power_supply_get_drvdata(psy);
 369         struct charger_data *charger = port->charger;
 370         struct cros_ec_device *ec_device = charger->ec_device;
 371         struct device *dev = charger->dev;
 372         int ret;
 373
 374         /* Only refresh ec_port_status for dynamic properties */
 375         switch (psp) {
 376         case POWER_SUPPLY_PROP_ONLINE:
 377                 /*
 378                  * If mkbp_event_supported, then we can be assured that
 379                  * the driver's state for the online property is consistent
 380                  * with the hardware. However, if we aren't event driven,
 381                  * the optimization before to skip an ec_port_status get
 382                  * and only returned cached values of the online property will
 383                  * cause a delay in detecting a cable attach until one of the
 384                  * other properties are read.
 385                  *
 386                  * Allow an ec_port_status refresh for online property check
 387                  * if we're not already online to check for plug events if
 388                  * not mkbp_event_supported.
 389                  */
 390                 if (ec_device->mkbp_event_supported || port->psy_online)
 391                         break;
 392                 /* fall through */
 393         case POWER_SUPPLY_PROP_CURRENT_MAX:
 394         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 395         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 396                 ret = cros_usbpd_charger_get_port_status(port, true);
 397                 if (ret < 0) {
 398                         dev_err(dev, "Failed to get port status (err:0x%x)\n",
 399                                 ret);
 400                         return -EINVAL;
 401                 }
 402                 break;
 403         default:
 404                 break;
 405         }
 406
 407         switch (psp) {
 408         case POWER_SUPPLY_PROP_ONLINE:
 409                 val->intval = port->psy_online;
 410                 break;
 411         case POWER_SUPPLY_PROP_STATUS:
 412                 val->intval = port->psy_status;
 413                 break;
 414         case POWER_SUPPLY_PROP_CURRENT_MAX:
 415                 val->intval = port->psy_current_max * 1000;
 416                 break;
 417         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 418                 val->intval = port->psy_voltage_max_design * 1000;
 419                 break;
 420         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 421                 val->intval = port->psy_voltage_now * 1000;
 422                 break;
 423         case POWER_SUPPLY_PROP_USB_TYPE:
 424                 val->intval = port->psy_usb_type;
 425                 break;
 426         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 427                 if (input_current_limit == EC_POWER_LIMIT_NONE)
 428                         val->intval = -1;
 429                 else
 430                         val->intval = input_current_limit * 1000;
 431                 break;
 432         case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
 433                 if (input_voltage_limit == EC_POWER_LIMIT_NONE)
 434                         val->intval = -1;
 435                 else
 436                         val->intval = input_voltage_limit * 1000;
 437                 break;
 438         case POWER_SUPPLY_PROP_MODEL_NAME:
 439                 val->strval = port->model_name;
 440                 break;
 441         case POWER_SUPPLY_PROP_MANUFACTURER:
 442                 val->strval = port->manufacturer;
 443                 break;
 444         default:
 445                 return -EINVAL;
 446         }
 447
 448         return 0;
 449 }
 450
 451 static int cros_usbpd_charger_set_prop(struct power_supply *psy,
 452                                        enum power_supply_property psp,
 453                                        const union power_supply_propval *val)
 454 {
 455         struct port_data *port = power_supply_get_drvdata(psy);
 456         struct charger_data *charger = port->charger;
 457         struct device *dev = charger->dev;
 458         u16 intval;
 459         int ret;
 460
 461         /* U16_MAX in mV/mA is the maximum supported value */
 462         if (val->intval >= U16_MAX * 1000)
 463                 return -EINVAL;
 464         /* A negative number is used to clear the limit */
 465         if (val->intval < 0)
 466                 intval = EC_POWER_LIMIT_NONE;
 467         else    /* Convert from uA/uV to mA/mV */
 468                 intval = val->intval / 1000;
 469
 470         switch (psp) {
 471         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 472                 ret = cros_usbpd_charger_set_ext_power_limit(charger, intval,
 473                                                         input_voltage_limit);
 474                 if (ret < 0)
 475                         break;
 476
 477                 input_current_limit = intval;
 478                 if (input_current_limit == EC_POWER_LIMIT_NONE)
 479                         dev_info(dev,
 480                           "External Current Limit cleared for all ports\n");
 481                 else
 482                         dev_info(dev,
 483                           "External Current Limit set to %dmA for all ports\n",
 484                           input_current_limit);
 485                 break;
 486         case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
 487                 ret = cros_usbpd_charger_set_ext_power_limit(charger,
 488                                                         input_current_limit,
 489                                                         intval);
 490                 if (ret < 0)
 491                         break;
 492
 493                 input_voltage_limit = intval;
 494                 if (input_voltage_limit == EC_POWER_LIMIT_NONE)
 495                         dev_info(dev,
 496                           "External Voltage Limit cleared for all ports\n");
 497                 else
 498                         dev_info(dev,
 499                           "External Voltage Limit set to %dmV for all ports\n",
 500                           input_voltage_limit);
 501                 break;
 502         default:
 503                 ret = -EINVAL;
 504         }
 505
 506         return ret;
 507 }
 508
 509 static int cros_usbpd_charger_property_is_writeable(struct power_supply *psy,
 510                                                 enum power_supply_property psp)
 511 {
 512         int ret;
 513
 514         switch (psp) {
 515         case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
 516         case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
 517                 ret = 1;
 518                 break;
 519         default:
 520                 ret = 0;
 521         }
 522
 523         return ret;
 524 }
 525
 526 static int cros_usbpd_charger_ec_event(struct notifier_block *nb,
 527                                        unsigned long queued_during_suspend,
 528                                        void *_notify)
 529 {
 530         struct cros_ec_device *ec_device;
 531         struct charger_data *charger;
 532         u32 host_event;
 533
 534         charger = container_of(nb, struct charger_data, notifier);
 535         ec_device = charger->ec_device;
 536
 537         host_event = cros_ec_get_host_event(ec_device);
 538         if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) {
 539                 cros_usbpd_charger_power_changed(charger->ports[0]->psy);
 540                 return NOTIFY_OK;
 541         } else {
 542                 return NOTIFY_DONE;
 543         }
 544 }
 545
 546 static void cros_usbpd_charger_unregister_notifier(void *data)
 547 {
 548         struct charger_data *charger = data;
 549         struct cros_ec_device *ec_device = charger->ec_device;
 550
 551         blocking_notifier_chain_unregister(&ec_device->event_notifier,
 552                                            &charger->notifier);
 553 }
 554
 555 static int cros_usbpd_charger_probe(struct platform_device *pd)
 556 {
 557         struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
 558         struct cros_ec_device *ec_device = ec_dev->ec_dev;
 559         struct power_supply_desc *psy_desc;
 560         struct device *dev = &pd->dev;
 561         struct charger_data *charger;
 562         struct power_supply *psy;
 563         struct port_data *port;
 564         int ret = -EINVAL;
 565         int i;
 566
 567         charger = devm_kzalloc(dev, sizeof(struct charger_data),
 568                                GFP_KERNEL);
 569         if (!charger)
 570                 return -ENOMEM;
 571
 572         charger->dev = dev;
 573         charger->ec_dev = ec_dev;
 574         charger->ec_device = ec_device;
 575
 576         platform_set_drvdata(pd, charger);
 577
 578         /*
 579          * We need to know the number of USB PD ports in order to know whether
 580          * there is a dedicated port. The dedicated port will always be
 581          * after the USB PD ports, and there should be only one.
 582          */
 583         charger->num_usbpd_ports =
 584                 cros_usbpd_charger_get_usbpd_num_ports(charger);
 585         if (charger->num_usbpd_ports <= 0) {
 586                 /*
 587                  * This can happen on a system that doesn't support USB PD.
 588                  * Log a message, but no need to warn.
 589                  */
 590                 dev_info(dev, "No USB PD charging ports found\n");
 591         }
 592
 593         charger->num_charger_ports = cros_usbpd_charger_get_num_ports(charger);
 594         if (charger->num_charger_ports < 0) {
 595                 /*
 596                  * This can happen on a system that doesn't support USB PD.
 597                  * Log a message, but no need to warn.
 598                  * Older ECs do not support the above command, in that case
 599                  * let's set up the number of charger ports equal to the number
 600                  * of USB PD ports
 601                  */
 602                 dev_info(dev, "Could not get charger port count\n");
 603                 charger->num_charger_ports = charger->num_usbpd_ports;
 604         }
 605
 606         if (charger->num_charger_ports <= 0) {
 607                 /*
 608                  * This can happen on a system that doesn't support USB PD and
 609                  * doesn't have a dedicated port.
 610                  * Log a message, but no need to warn.
 611                  */
 612                 dev_info(dev, "No charging ports found\n");
 613                 ret = -ENODEV;
 614                 goto fail_nowarn;
 615         }
 616
 617         /*
 618          * Sanity checks on the number of ports:
 619          *  there should be at most 1 dedicated port
 620          */
 621         if (charger->num_charger_ports < charger->num_usbpd_ports ||
 622             charger->num_charger_ports > (charger->num_usbpd_ports + 1)) {
 623                 dev_err(dev, "Unexpected number of charge port count\n");
 624                 ret = -EPROTO;
 625                 goto fail_nowarn;
 626         }
 627
 628         for (i = 0; i < charger->num_charger_ports; i++) {
 629                 struct power_supply_config psy_cfg = {};
 630
 631                 port = devm_kzalloc(dev, sizeof(struct port_data), GFP_KERNEL);
 632                 if (!port) {
 633                         ret = -ENOMEM;
 634                         goto fail;
 635                 }
 636
 637                 port->charger = charger;
 638                 port->port_number = i;
 639
 640                 psy_desc = &port->psy_desc;
 641                 psy_desc->get_property = cros_usbpd_charger_get_prop;
 642                 psy_desc->set_property = cros_usbpd_charger_set_prop;
 643                 psy_desc->property_is_writeable =
 644                                 cros_usbpd_charger_property_is_writeable;
 645                 psy_desc->external_power_changed =
 646                                         cros_usbpd_charger_power_changed;
 647                 psy_cfg.drv_data = port;
 648
 649                 if (cros_usbpd_charger_port_is_dedicated(port)) {
 650                         sprintf(port->name, CHARGER_DEDICATED_DIR_NAME);
 651                         psy_desc->type = POWER_SUPPLY_TYPE_MAINS;
 652                         psy_desc->properties =
 653                                 cros_usbpd_dedicated_charger_props;
 654                         psy_desc->num_properties =
 655                                 ARRAY_SIZE(cros_usbpd_dedicated_charger_props);
 656                 } else {
 657                         sprintf(port->name, CHARGER_USBPD_DIR_NAME, i);
 658                         psy_desc->type = POWER_SUPPLY_TYPE_USB;
 659                         psy_desc->properties = cros_usbpd_charger_props;
 660                         psy_desc->num_properties =
 661                                 ARRAY_SIZE(cros_usbpd_charger_props);
 662                         psy_desc->usb_types = cros_usbpd_charger_usb_types;
 663                         psy_desc->num_usb_types =
 664                                 ARRAY_SIZE(cros_usbpd_charger_usb_types);
 665                 }
 666
 667                 psy_desc->name = port->name;
 668
 669                 psy = devm_power_supply_register_no_ws(dev, psy_desc,
 670                                                        &psy_cfg);
 671                 if (IS_ERR(psy)) {
 672                         dev_err(dev, "Failed to register power supply\n");
 673                         continue;
 674                 }
 675                 port->psy = psy;
 676
 677                 charger->ports[charger->num_registered_psy++] = port;
 678         }
 679
 680         if (!charger->num_registered_psy) {
 681                 ret = -ENODEV;
 682                 dev_err(dev, "No power supplies registered\n");
 683                 goto fail;
 684         }
 685
 686         if (ec_device->mkbp_event_supported) {
 687                 /* Get PD events from the EC */
 688                 charger->notifier.notifier_call = cros_usbpd_charger_ec_event;
 689                 ret = blocking_notifier_chain_register(
 690                                                 &ec_device->event_notifier,
 691                                                 &charger->notifier);
 692                 if (ret < 0) {
 693                         dev_warn(dev, "failed to register notifier\n");
 694                 } else {
 695                         ret = devm_add_action_or_reset(dev,
 696                                         cros_usbpd_charger_unregister_notifier,
 697                                         charger);
 698                         if (ret < 0)
 699                                 goto fail;
 700                 }
 701         }
 702
 703         return 0;
 704
 705 fail:
 706         WARN(1, "%s: Failing probe (err:0x%x)\n", dev_name(dev), ret);
 707
 708 fail_nowarn:
 709         dev_info(dev, "Failing probe (err:0x%x)\n", ret);
 710         return ret;
 711 }
 712
 713 #ifdef CONFIG_PM_SLEEP
 714 static int cros_usbpd_charger_resume(struct device *dev)
 715 {
 716         struct charger_data *charger = dev_get_drvdata(dev);
 717         int i;
 718
 719         if (!charger)
 720                 return 0;
 721
 722         for (i = 0; i < charger->num_registered_psy; i++) {
 723                 power_supply_changed(charger->ports[i]->psy);
 724                 charger->ports[i]->last_update =
 725                                 jiffies - CHARGER_CACHE_UPDATE_DELAY;
 726         }
 727
 728         return 0;
 729 }
 730 #endif
 731
 732 static SIMPLE_DEV_PM_OPS(cros_usbpd_charger_pm_ops, NULL,
 733                          cros_usbpd_charger_resume);
 734
 735 static struct platform_driver cros_usbpd_charger_driver = {
 736         .driver = {
 737                 .name = DRV_NAME,
 738                 .pm = &cros_usbpd_charger_pm_ops,
 739         },
 740         .probe = cros_usbpd_charger_probe
 741 };
 742
 743 module_platform_driver(cros_usbpd_charger_driver);
 744
 745 MODULE_LICENSE("GPL");
 746 MODULE_DESCRIPTION("ChromeOS EC USBPD charger");
 747 MODULE_ALIAS("platform:" DRV_NAME);