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