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