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