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