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