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/platform_data/cros_ec_commands.h>
10 #include <linux/platform_data/cros_ec_proto.h>
11 #include <linux/platform_data/cros_usbpd_notify.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 		fallthrough;
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 host_event,
522 				       void *_notify)
523 {
524 	struct charger_data *charger = container_of(nb, struct charger_data,
525 						    notifier);
526 
527 	cros_usbpd_charger_power_changed(charger->ports[0]->psy);
528 	return NOTIFY_OK;
529 }
530 
531 static void cros_usbpd_charger_unregister_notifier(void *data)
532 {
533 	struct charger_data *charger = data;
534 
535 	cros_usbpd_unregister_notify(&charger->notifier);
536 }
537 
538 static int cros_usbpd_charger_probe(struct platform_device *pd)
539 {
540 	struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent);
541 	struct cros_ec_device *ec_device = ec_dev->ec_dev;
542 	struct power_supply_desc *psy_desc;
543 	struct device *dev = &pd->dev;
544 	struct charger_data *charger;
545 	struct power_supply *psy;
546 	struct port_data *port;
547 	int ret = -EINVAL;
548 	int i;
549 
550 	charger = devm_kzalloc(dev, sizeof(struct charger_data),
551 			       GFP_KERNEL);
552 	if (!charger)
553 		return -ENOMEM;
554 
555 	charger->dev = dev;
556 	charger->ec_dev = ec_dev;
557 	charger->ec_device = ec_device;
558 
559 	platform_set_drvdata(pd, charger);
560 
561 	/*
562 	 * We need to know the number of USB PD ports in order to know whether
563 	 * there is a dedicated port. The dedicated port will always be
564 	 * after the USB PD ports, and there should be only one.
565 	 */
566 	charger->num_usbpd_ports =
567 		cros_usbpd_charger_get_usbpd_num_ports(charger);
568 	if (charger->num_usbpd_ports <= 0) {
569 		/*
570 		 * This can happen on a system that doesn't support USB PD.
571 		 * Log a message, but no need to warn.
572 		 */
573 		dev_info(dev, "No USB PD charging ports found\n");
574 	}
575 
576 	charger->num_charger_ports = cros_usbpd_charger_get_num_ports(charger);
577 	if (charger->num_charger_ports < 0) {
578 		/*
579 		 * This can happen on a system that doesn't support USB PD.
580 		 * Log a message, but no need to warn.
581 		 * Older ECs do not support the above command, in that case
582 		 * let's set up the number of charger ports equal to the number
583 		 * of USB PD ports
584 		 */
585 		dev_info(dev, "Could not get charger port count\n");
586 		charger->num_charger_ports = charger->num_usbpd_ports;
587 	}
588 
589 	if (charger->num_charger_ports <= 0) {
590 		/*
591 		 * This can happen on a system that doesn't support USB PD and
592 		 * doesn't have a dedicated port.
593 		 * Log a message, but no need to warn.
594 		 */
595 		dev_info(dev, "No charging ports found\n");
596 		ret = -ENODEV;
597 		goto fail_nowarn;
598 	}
599 
600 	/*
601 	 * Sanity checks on the number of ports:
602 	 *  there should be at most 1 dedicated port
603 	 */
604 	if (charger->num_charger_ports < charger->num_usbpd_ports ||
605 	    charger->num_charger_ports > (charger->num_usbpd_ports + 1)) {
606 		dev_err(dev, "Unexpected number of charge port count\n");
607 		ret = -EPROTO;
608 		goto fail_nowarn;
609 	}
610 
611 	for (i = 0; i < charger->num_charger_ports; i++) {
612 		struct power_supply_config psy_cfg = {};
613 
614 		port = devm_kzalloc(dev, sizeof(struct port_data), GFP_KERNEL);
615 		if (!port) {
616 			ret = -ENOMEM;
617 			goto fail;
618 		}
619 
620 		port->charger = charger;
621 		port->port_number = i;
622 
623 		psy_desc = &port->psy_desc;
624 		psy_desc->get_property = cros_usbpd_charger_get_prop;
625 		psy_desc->set_property = cros_usbpd_charger_set_prop;
626 		psy_desc->property_is_writeable =
627 				cros_usbpd_charger_property_is_writeable;
628 		psy_desc->external_power_changed =
629 					cros_usbpd_charger_power_changed;
630 		psy_cfg.drv_data = port;
631 
632 		if (cros_usbpd_charger_port_is_dedicated(port)) {
633 			sprintf(port->name, CHARGER_DEDICATED_DIR_NAME);
634 			psy_desc->type = POWER_SUPPLY_TYPE_MAINS;
635 			psy_desc->properties =
636 				cros_usbpd_dedicated_charger_props;
637 			psy_desc->num_properties =
638 				ARRAY_SIZE(cros_usbpd_dedicated_charger_props);
639 		} else {
640 			sprintf(port->name, CHARGER_USBPD_DIR_NAME, i);
641 			psy_desc->type = POWER_SUPPLY_TYPE_USB;
642 			psy_desc->properties = cros_usbpd_charger_props;
643 			psy_desc->num_properties =
644 				ARRAY_SIZE(cros_usbpd_charger_props);
645 			psy_desc->usb_types = cros_usbpd_charger_usb_types;
646 			psy_desc->num_usb_types =
647 				ARRAY_SIZE(cros_usbpd_charger_usb_types);
648 		}
649 
650 		psy_desc->name = port->name;
651 
652 		psy = devm_power_supply_register_no_ws(dev, psy_desc,
653 						       &psy_cfg);
654 		if (IS_ERR(psy)) {
655 			dev_err(dev, "Failed to register power supply\n");
656 			continue;
657 		}
658 		port->psy = psy;
659 
660 		charger->ports[charger->num_registered_psy++] = port;
661 	}
662 
663 	if (!charger->num_registered_psy) {
664 		ret = -ENODEV;
665 		dev_err(dev, "No power supplies registered\n");
666 		goto fail;
667 	}
668 
669 	/* Get PD events from the EC */
670 	charger->notifier.notifier_call = cros_usbpd_charger_ec_event;
671 	ret = cros_usbpd_register_notify(&charger->notifier);
672 	if (ret < 0) {
673 		dev_warn(dev, "failed to register notifier\n");
674 	} else {
675 		ret = devm_add_action_or_reset(dev,
676 				cros_usbpd_charger_unregister_notifier,
677 				charger);
678 		if (ret < 0)
679 			goto fail;
680 	}
681 
682 	return 0;
683 
684 fail:
685 	WARN(1, "%s: Failing probe (err:0x%x)\n", dev_name(dev), ret);
686 
687 fail_nowarn:
688 	dev_info(dev, "Failing probe (err:0x%x)\n", ret);
689 	return ret;
690 }
691 
692 #ifdef CONFIG_PM_SLEEP
693 static int cros_usbpd_charger_resume(struct device *dev)
694 {
695 	struct charger_data *charger = dev_get_drvdata(dev);
696 	int i;
697 
698 	if (!charger)
699 		return 0;
700 
701 	for (i = 0; i < charger->num_registered_psy; i++) {
702 		power_supply_changed(charger->ports[i]->psy);
703 		charger->ports[i]->last_update =
704 				jiffies - CHARGER_CACHE_UPDATE_DELAY;
705 	}
706 
707 	return 0;
708 }
709 #endif
710 
711 static SIMPLE_DEV_PM_OPS(cros_usbpd_charger_pm_ops, NULL,
712 			 cros_usbpd_charger_resume);
713 
714 static struct platform_driver cros_usbpd_charger_driver = {
715 	.driver = {
716 		.name = DRV_NAME,
717 		.pm = &cros_usbpd_charger_pm_ops,
718 	},
719 	.probe = cros_usbpd_charger_probe
720 };
721 
722 module_platform_driver(cros_usbpd_charger_driver);
723 
724 MODULE_LICENSE("GPL");
725 MODULE_DESCRIPTION("ChromeOS EC USBPD charger");
726 MODULE_ALIAS("platform:" DRV_NAME);
727