1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * USB Type-C Connector Class
4  *
5  * Copyright (C) 2017, Intel Corporation
6  * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
7  */
8 
9 #include <linux/module.h>
10 #include <linux/mutex.h>
11 #include <linux/property.h>
12 #include <linux/slab.h>
13 #include <linux/usb/pd_vdo.h>
14 #include <linux/usb/typec_mux.h>
15 #include <linux/usb/typec_retimer.h>
16 
17 #include "bus.h"
18 #include "class.h"
19 #include "pd.h"
20 
21 static DEFINE_IDA(typec_index_ida);
22 
23 struct class typec_class = {
24 	.name = "typec",
25 };
26 
27 /* ------------------------------------------------------------------------- */
28 /* Common attributes */
29 
30 static const char * const typec_accessory_modes[] = {
31 	[TYPEC_ACCESSORY_NONE]		= "none",
32 	[TYPEC_ACCESSORY_AUDIO]		= "analog_audio",
33 	[TYPEC_ACCESSORY_DEBUG]		= "debug",
34 };
35 
36 /* Product types defined in USB PD Specification R3.0 V2.0 */
37 static const char * const product_type_ufp[8] = {
38 	[IDH_PTYPE_NOT_UFP]		= "not_ufp",
39 	[IDH_PTYPE_HUB]			= "hub",
40 	[IDH_PTYPE_PERIPH]		= "peripheral",
41 	[IDH_PTYPE_PSD]			= "psd",
42 	[IDH_PTYPE_AMA]			= "ama",
43 };
44 
45 static const char * const product_type_dfp[8] = {
46 	[IDH_PTYPE_NOT_DFP]		= "not_dfp",
47 	[IDH_PTYPE_DFP_HUB]		= "hub",
48 	[IDH_PTYPE_DFP_HOST]		= "host",
49 	[IDH_PTYPE_DFP_PB]		= "power_brick",
50 };
51 
52 static const char * const product_type_cable[8] = {
53 	[IDH_PTYPE_NOT_CABLE]		= "not_cable",
54 	[IDH_PTYPE_PCABLE]		= "passive",
55 	[IDH_PTYPE_ACABLE]		= "active",
56 	[IDH_PTYPE_VPD]			= "vpd",
57 };
58 
get_pd_identity(struct device * dev)59 static struct usb_pd_identity *get_pd_identity(struct device *dev)
60 {
61 	if (is_typec_partner(dev)) {
62 		struct typec_partner *partner = to_typec_partner(dev);
63 
64 		return partner->identity;
65 	} else if (is_typec_cable(dev)) {
66 		struct typec_cable *cable = to_typec_cable(dev);
67 
68 		return cable->identity;
69 	}
70 	return NULL;
71 }
72 
get_pd_product_type(struct device * dev)73 static const char *get_pd_product_type(struct device *dev)
74 {
75 	struct typec_port *port = to_typec_port(dev->parent);
76 	struct usb_pd_identity *id = get_pd_identity(dev);
77 	const char *ptype = NULL;
78 
79 	if (is_typec_partner(dev)) {
80 		if (!id)
81 			return NULL;
82 
83 		if (port->data_role == TYPEC_HOST)
84 			ptype = product_type_ufp[PD_IDH_PTYPE(id->id_header)];
85 		else
86 			ptype = product_type_dfp[PD_IDH_DFP_PTYPE(id->id_header)];
87 	} else if (is_typec_cable(dev)) {
88 		if (id)
89 			ptype = product_type_cable[PD_IDH_PTYPE(id->id_header)];
90 		else
91 			ptype = to_typec_cable(dev)->active ?
92 				product_type_cable[IDH_PTYPE_ACABLE] :
93 				product_type_cable[IDH_PTYPE_PCABLE];
94 	}
95 
96 	return ptype;
97 }
98 
id_header_show(struct device * dev,struct device_attribute * attr,char * buf)99 static ssize_t id_header_show(struct device *dev, struct device_attribute *attr,
100 			      char *buf)
101 {
102 	struct usb_pd_identity *id = get_pd_identity(dev);
103 
104 	return sprintf(buf, "0x%08x\n", id->id_header);
105 }
106 static DEVICE_ATTR_RO(id_header);
107 
cert_stat_show(struct device * dev,struct device_attribute * attr,char * buf)108 static ssize_t cert_stat_show(struct device *dev, struct device_attribute *attr,
109 			      char *buf)
110 {
111 	struct usb_pd_identity *id = get_pd_identity(dev);
112 
113 	return sprintf(buf, "0x%08x\n", id->cert_stat);
114 }
115 static DEVICE_ATTR_RO(cert_stat);
116 
product_show(struct device * dev,struct device_attribute * attr,char * buf)117 static ssize_t product_show(struct device *dev, struct device_attribute *attr,
118 			    char *buf)
119 {
120 	struct usb_pd_identity *id = get_pd_identity(dev);
121 
122 	return sprintf(buf, "0x%08x\n", id->product);
123 }
124 static DEVICE_ATTR_RO(product);
125 
product_type_vdo1_show(struct device * dev,struct device_attribute * attr,char * buf)126 static ssize_t product_type_vdo1_show(struct device *dev, struct device_attribute *attr,
127 				      char *buf)
128 {
129 	struct usb_pd_identity *id = get_pd_identity(dev);
130 
131 	return sysfs_emit(buf, "0x%08x\n", id->vdo[0]);
132 }
133 static DEVICE_ATTR_RO(product_type_vdo1);
134 
product_type_vdo2_show(struct device * dev,struct device_attribute * attr,char * buf)135 static ssize_t product_type_vdo2_show(struct device *dev, struct device_attribute *attr,
136 				      char *buf)
137 {
138 	struct usb_pd_identity *id = get_pd_identity(dev);
139 
140 	return sysfs_emit(buf, "0x%08x\n", id->vdo[1]);
141 }
142 static DEVICE_ATTR_RO(product_type_vdo2);
143 
product_type_vdo3_show(struct device * dev,struct device_attribute * attr,char * buf)144 static ssize_t product_type_vdo3_show(struct device *dev, struct device_attribute *attr,
145 				      char *buf)
146 {
147 	struct usb_pd_identity *id = get_pd_identity(dev);
148 
149 	return sysfs_emit(buf, "0x%08x\n", id->vdo[2]);
150 }
151 static DEVICE_ATTR_RO(product_type_vdo3);
152 
153 static struct attribute *usb_pd_id_attrs[] = {
154 	&dev_attr_id_header.attr,
155 	&dev_attr_cert_stat.attr,
156 	&dev_attr_product.attr,
157 	&dev_attr_product_type_vdo1.attr,
158 	&dev_attr_product_type_vdo2.attr,
159 	&dev_attr_product_type_vdo3.attr,
160 	NULL
161 };
162 
163 static const struct attribute_group usb_pd_id_group = {
164 	.name = "identity",
165 	.attrs = usb_pd_id_attrs,
166 };
167 
168 static const struct attribute_group *usb_pd_id_groups[] = {
169 	&usb_pd_id_group,
170 	NULL,
171 };
172 
typec_product_type_notify(struct device * dev)173 static void typec_product_type_notify(struct device *dev)
174 {
175 	char *envp[2] = { };
176 	const char *ptype;
177 
178 	ptype = get_pd_product_type(dev);
179 	if (!ptype)
180 		return;
181 
182 	sysfs_notify(&dev->kobj, NULL, "type");
183 
184 	envp[0] = kasprintf(GFP_KERNEL, "PRODUCT_TYPE=%s", ptype);
185 	if (!envp[0])
186 		return;
187 
188 	kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
189 	kfree(envp[0]);
190 }
191 
typec_report_identity(struct device * dev)192 static void typec_report_identity(struct device *dev)
193 {
194 	sysfs_notify(&dev->kobj, "identity", "id_header");
195 	sysfs_notify(&dev->kobj, "identity", "cert_stat");
196 	sysfs_notify(&dev->kobj, "identity", "product");
197 	sysfs_notify(&dev->kobj, "identity", "product_type_vdo1");
198 	sysfs_notify(&dev->kobj, "identity", "product_type_vdo2");
199 	sysfs_notify(&dev->kobj, "identity", "product_type_vdo3");
200 	typec_product_type_notify(dev);
201 }
202 
203 static ssize_t
type_show(struct device * dev,struct device_attribute * attr,char * buf)204 type_show(struct device *dev, struct device_attribute *attr, char *buf)
205 {
206 	const char *ptype;
207 
208 	ptype = get_pd_product_type(dev);
209 	if (!ptype)
210 		return 0;
211 
212 	return sysfs_emit(buf, "%s\n", ptype);
213 }
214 static DEVICE_ATTR_RO(type);
215 
216 static ssize_t usb_power_delivery_revision_show(struct device *dev,
217 						struct device_attribute *attr,
218 						char *buf);
219 static DEVICE_ATTR_RO(usb_power_delivery_revision);
220 
221 /* ------------------------------------------------------------------------- */
222 /* Alternate Modes */
223 
altmode_match(struct device * dev,void * data)224 static int altmode_match(struct device *dev, void *data)
225 {
226 	struct typec_altmode *adev = to_typec_altmode(dev);
227 	struct typec_device_id *id = data;
228 
229 	if (!is_typec_altmode(dev))
230 		return 0;
231 
232 	return ((adev->svid == id->svid) && (adev->mode == id->mode));
233 }
234 
typec_altmode_set_partner(struct altmode * altmode)235 static void typec_altmode_set_partner(struct altmode *altmode)
236 {
237 	struct typec_altmode *adev = &altmode->adev;
238 	struct typec_device_id id = { adev->svid, adev->mode, };
239 	struct typec_port *port = typec_altmode2port(adev);
240 	struct altmode *partner;
241 	struct device *dev;
242 
243 	dev = device_find_child(&port->dev, &id, altmode_match);
244 	if (!dev)
245 		return;
246 
247 	/* Bind the port alt mode to the partner/plug alt mode. */
248 	partner = to_altmode(to_typec_altmode(dev));
249 	altmode->partner = partner;
250 
251 	/* Bind the partner/plug alt mode to the port alt mode. */
252 	if (is_typec_plug(adev->dev.parent)) {
253 		struct typec_plug *plug = to_typec_plug(adev->dev.parent);
254 
255 		partner->plug[plug->index] = altmode;
256 	} else {
257 		partner->partner = altmode;
258 	}
259 }
260 
typec_altmode_put_partner(struct altmode * altmode)261 static void typec_altmode_put_partner(struct altmode *altmode)
262 {
263 	struct altmode *partner = altmode->partner;
264 	struct typec_altmode *adev;
265 	struct typec_altmode *partner_adev;
266 
267 	if (!partner)
268 		return;
269 
270 	adev = &altmode->adev;
271 	partner_adev = &partner->adev;
272 
273 	if (is_typec_plug(adev->dev.parent)) {
274 		struct typec_plug *plug = to_typec_plug(adev->dev.parent);
275 
276 		partner->plug[plug->index] = NULL;
277 	} else {
278 		partner->partner = NULL;
279 	}
280 	put_device(&partner_adev->dev);
281 }
282 
283 /**
284  * typec_altmode_update_active - Report Enter/Exit mode
285  * @adev: Handle to the alternate mode
286  * @active: True when the mode has been entered
287  *
288  * If a partner or cable plug executes Enter/Exit Mode command successfully, the
289  * drivers use this routine to report the updated state of the mode.
290  */
typec_altmode_update_active(struct typec_altmode * adev,bool active)291 void typec_altmode_update_active(struct typec_altmode *adev, bool active)
292 {
293 	char dir[6];
294 
295 	if (adev->active == active)
296 		return;
297 
298 	if (!is_typec_port(adev->dev.parent) && adev->dev.driver) {
299 		if (!active)
300 			module_put(adev->dev.driver->owner);
301 		else
302 			WARN_ON(!try_module_get(adev->dev.driver->owner));
303 	}
304 
305 	adev->active = active;
306 	snprintf(dir, sizeof(dir), "mode%d", adev->mode);
307 	sysfs_notify(&adev->dev.kobj, dir, "active");
308 	sysfs_notify(&adev->dev.kobj, NULL, "active");
309 	kobject_uevent(&adev->dev.kobj, KOBJ_CHANGE);
310 }
311 EXPORT_SYMBOL_GPL(typec_altmode_update_active);
312 
313 /**
314  * typec_altmode2port - Alternate Mode to USB Type-C port
315  * @alt: The Alternate Mode
316  *
317  * Returns handle to the port that a cable plug or partner with @alt is
318  * connected to.
319  */
typec_altmode2port(struct typec_altmode * alt)320 struct typec_port *typec_altmode2port(struct typec_altmode *alt)
321 {
322 	if (is_typec_plug(alt->dev.parent))
323 		return to_typec_port(alt->dev.parent->parent->parent);
324 	if (is_typec_partner(alt->dev.parent))
325 		return to_typec_port(alt->dev.parent->parent);
326 	if (is_typec_port(alt->dev.parent))
327 		return to_typec_port(alt->dev.parent);
328 
329 	return NULL;
330 }
331 EXPORT_SYMBOL_GPL(typec_altmode2port);
332 
333 static ssize_t
vdo_show(struct device * dev,struct device_attribute * attr,char * buf)334 vdo_show(struct device *dev, struct device_attribute *attr, char *buf)
335 {
336 	struct typec_altmode *alt = to_typec_altmode(dev);
337 
338 	return sprintf(buf, "0x%08x\n", alt->vdo);
339 }
340 static DEVICE_ATTR_RO(vdo);
341 
342 static ssize_t
description_show(struct device * dev,struct device_attribute * attr,char * buf)343 description_show(struct device *dev, struct device_attribute *attr, char *buf)
344 {
345 	struct typec_altmode *alt = to_typec_altmode(dev);
346 
347 	return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
348 }
349 static DEVICE_ATTR_RO(description);
350 
351 static ssize_t
active_show(struct device * dev,struct device_attribute * attr,char * buf)352 active_show(struct device *dev, struct device_attribute *attr, char *buf)
353 {
354 	struct typec_altmode *alt = to_typec_altmode(dev);
355 
356 	return sprintf(buf, "%s\n", alt->active ? "yes" : "no");
357 }
358 
active_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)359 static ssize_t active_store(struct device *dev, struct device_attribute *attr,
360 			    const char *buf, size_t size)
361 {
362 	struct typec_altmode *adev = to_typec_altmode(dev);
363 	struct altmode *altmode = to_altmode(adev);
364 	bool enter;
365 	int ret;
366 
367 	ret = kstrtobool(buf, &enter);
368 	if (ret)
369 		return ret;
370 
371 	if (adev->active == enter)
372 		return size;
373 
374 	if (is_typec_port(adev->dev.parent)) {
375 		typec_altmode_update_active(adev, enter);
376 
377 		/* Make sure that the partner exits the mode before disabling */
378 		if (altmode->partner && !enter && altmode->partner->adev.active)
379 			typec_altmode_exit(&altmode->partner->adev);
380 	} else if (altmode->partner) {
381 		if (enter && !altmode->partner->adev.active) {
382 			dev_warn(dev, "port has the mode disabled\n");
383 			return -EPERM;
384 		}
385 	}
386 
387 	/* Note: If there is no driver, the mode will not be entered */
388 	if (adev->ops && adev->ops->activate) {
389 		ret = adev->ops->activate(adev, enter);
390 		if (ret)
391 			return ret;
392 	}
393 
394 	return size;
395 }
396 static DEVICE_ATTR_RW(active);
397 
398 static ssize_t
supported_roles_show(struct device * dev,struct device_attribute * attr,char * buf)399 supported_roles_show(struct device *dev, struct device_attribute *attr,
400 		     char *buf)
401 {
402 	struct altmode *alt = to_altmode(to_typec_altmode(dev));
403 	ssize_t ret;
404 
405 	switch (alt->roles) {
406 	case TYPEC_PORT_SRC:
407 		ret = sprintf(buf, "source\n");
408 		break;
409 	case TYPEC_PORT_SNK:
410 		ret = sprintf(buf, "sink\n");
411 		break;
412 	case TYPEC_PORT_DRP:
413 	default:
414 		ret = sprintf(buf, "source sink\n");
415 		break;
416 	}
417 	return ret;
418 }
419 static DEVICE_ATTR_RO(supported_roles);
420 
421 static ssize_t
mode_show(struct device * dev,struct device_attribute * attr,char * buf)422 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
423 {
424 	struct typec_altmode *adev = to_typec_altmode(dev);
425 
426 	return sprintf(buf, "%u\n", adev->mode);
427 }
428 static DEVICE_ATTR_RO(mode);
429 
430 static ssize_t
svid_show(struct device * dev,struct device_attribute * attr,char * buf)431 svid_show(struct device *dev, struct device_attribute *attr, char *buf)
432 {
433 	struct typec_altmode *adev = to_typec_altmode(dev);
434 
435 	return sprintf(buf, "%04x\n", adev->svid);
436 }
437 static DEVICE_ATTR_RO(svid);
438 
439 static struct attribute *typec_altmode_attrs[] = {
440 	&dev_attr_active.attr,
441 	&dev_attr_mode.attr,
442 	&dev_attr_svid.attr,
443 	&dev_attr_vdo.attr,
444 	NULL
445 };
446 
typec_altmode_attr_is_visible(struct kobject * kobj,struct attribute * attr,int n)447 static umode_t typec_altmode_attr_is_visible(struct kobject *kobj,
448 					     struct attribute *attr, int n)
449 {
450 	struct typec_altmode *adev = to_typec_altmode(kobj_to_dev(kobj));
451 
452 	if (attr == &dev_attr_active.attr)
453 		if (!adev->ops || !adev->ops->activate)
454 			return 0444;
455 
456 	return attr->mode;
457 }
458 
459 static const struct attribute_group typec_altmode_group = {
460 	.is_visible = typec_altmode_attr_is_visible,
461 	.attrs = typec_altmode_attrs,
462 };
463 
464 static const struct attribute_group *typec_altmode_groups[] = {
465 	&typec_altmode_group,
466 	NULL
467 };
468 
altmode_id_get(struct device * dev)469 static int altmode_id_get(struct device *dev)
470 {
471 	struct ida *ids;
472 
473 	if (is_typec_partner(dev))
474 		ids = &to_typec_partner(dev)->mode_ids;
475 	else if (is_typec_plug(dev))
476 		ids = &to_typec_plug(dev)->mode_ids;
477 	else
478 		ids = &to_typec_port(dev)->mode_ids;
479 
480 	return ida_simple_get(ids, 0, 0, GFP_KERNEL);
481 }
482 
altmode_id_remove(struct device * dev,int id)483 static void altmode_id_remove(struct device *dev, int id)
484 {
485 	struct ida *ids;
486 
487 	if (is_typec_partner(dev))
488 		ids = &to_typec_partner(dev)->mode_ids;
489 	else if (is_typec_plug(dev))
490 		ids = &to_typec_plug(dev)->mode_ids;
491 	else
492 		ids = &to_typec_port(dev)->mode_ids;
493 
494 	ida_simple_remove(ids, id);
495 }
496 
typec_altmode_release(struct device * dev)497 static void typec_altmode_release(struct device *dev)
498 {
499 	struct altmode *alt = to_altmode(to_typec_altmode(dev));
500 
501 	if (!is_typec_port(dev->parent))
502 		typec_altmode_put_partner(alt);
503 
504 	altmode_id_remove(alt->adev.dev.parent, alt->id);
505 	kfree(alt);
506 }
507 
508 const struct device_type typec_altmode_dev_type = {
509 	.name = "typec_alternate_mode",
510 	.groups = typec_altmode_groups,
511 	.release = typec_altmode_release,
512 };
513 
514 static struct typec_altmode *
typec_register_altmode(struct device * parent,const struct typec_altmode_desc * desc)515 typec_register_altmode(struct device *parent,
516 		       const struct typec_altmode_desc *desc)
517 {
518 	unsigned int id = altmode_id_get(parent);
519 	bool is_port = is_typec_port(parent);
520 	struct altmode *alt;
521 	int ret;
522 
523 	alt = kzalloc(sizeof(*alt), GFP_KERNEL);
524 	if (!alt) {
525 		altmode_id_remove(parent, id);
526 		return ERR_PTR(-ENOMEM);
527 	}
528 
529 	alt->adev.svid = desc->svid;
530 	alt->adev.mode = desc->mode;
531 	alt->adev.vdo = desc->vdo;
532 	alt->roles = desc->roles;
533 	alt->id = id;
534 
535 	alt->attrs[0] = &dev_attr_vdo.attr;
536 	alt->attrs[1] = &dev_attr_description.attr;
537 	alt->attrs[2] = &dev_attr_active.attr;
538 
539 	if (is_port) {
540 		alt->attrs[3] = &dev_attr_supported_roles.attr;
541 		alt->adev.active = true; /* Enabled by default */
542 	}
543 
544 	sprintf(alt->group_name, "mode%d", desc->mode);
545 	alt->group.name = alt->group_name;
546 	alt->group.attrs = alt->attrs;
547 	alt->groups[0] = &alt->group;
548 
549 	alt->adev.dev.parent = parent;
550 	alt->adev.dev.groups = alt->groups;
551 	alt->adev.dev.type = &typec_altmode_dev_type;
552 	dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id);
553 
554 	/* Link partners and plugs with the ports */
555 	if (!is_port)
556 		typec_altmode_set_partner(alt);
557 
558 	/* The partners are bind to drivers */
559 	if (is_typec_partner(parent))
560 		alt->adev.dev.bus = &typec_bus;
561 
562 	/* Plug alt modes need a class to generate udev events. */
563 	if (is_typec_plug(parent))
564 		alt->adev.dev.class = &typec_class;
565 
566 	ret = device_register(&alt->adev.dev);
567 	if (ret) {
568 		dev_err(parent, "failed to register alternate mode (%d)\n",
569 			ret);
570 		put_device(&alt->adev.dev);
571 		return ERR_PTR(ret);
572 	}
573 
574 	return &alt->adev;
575 }
576 
577 /**
578  * typec_unregister_altmode - Unregister Alternate Mode
579  * @adev: The alternate mode to be unregistered
580  *
581  * Unregister device created with typec_partner_register_altmode(),
582  * typec_plug_register_altmode() or typec_port_register_altmode().
583  */
typec_unregister_altmode(struct typec_altmode * adev)584 void typec_unregister_altmode(struct typec_altmode *adev)
585 {
586 	if (IS_ERR_OR_NULL(adev))
587 		return;
588 	typec_retimer_put(to_altmode(adev)->retimer);
589 	typec_mux_put(to_altmode(adev)->mux);
590 	device_unregister(&adev->dev);
591 }
592 EXPORT_SYMBOL_GPL(typec_unregister_altmode);
593 
594 /* ------------------------------------------------------------------------- */
595 /* Type-C Partners */
596 
accessory_mode_show(struct device * dev,struct device_attribute * attr,char * buf)597 static ssize_t accessory_mode_show(struct device *dev,
598 				   struct device_attribute *attr,
599 				   char *buf)
600 {
601 	struct typec_partner *p = to_typec_partner(dev);
602 
603 	return sprintf(buf, "%s\n", typec_accessory_modes[p->accessory]);
604 }
605 static DEVICE_ATTR_RO(accessory_mode);
606 
supports_usb_power_delivery_show(struct device * dev,struct device_attribute * attr,char * buf)607 static ssize_t supports_usb_power_delivery_show(struct device *dev,
608 						struct device_attribute *attr,
609 						char *buf)
610 {
611 	struct typec_partner *p = to_typec_partner(dev);
612 
613 	return sprintf(buf, "%s\n", p->usb_pd ? "yes" : "no");
614 }
615 static DEVICE_ATTR_RO(supports_usb_power_delivery);
616 
number_of_alternate_modes_show(struct device * dev,struct device_attribute * attr,char * buf)617 static ssize_t number_of_alternate_modes_show(struct device *dev, struct device_attribute *attr,
618 					      char *buf)
619 {
620 	struct typec_partner *partner;
621 	struct typec_plug *plug;
622 	int num_altmodes;
623 
624 	if (is_typec_partner(dev)) {
625 		partner = to_typec_partner(dev);
626 		num_altmodes = partner->num_altmodes;
627 	} else if (is_typec_plug(dev)) {
628 		plug = to_typec_plug(dev);
629 		num_altmodes = plug->num_altmodes;
630 	} else {
631 		return 0;
632 	}
633 
634 	return sysfs_emit(buf, "%d\n", num_altmodes);
635 }
636 static DEVICE_ATTR_RO(number_of_alternate_modes);
637 
638 static struct attribute *typec_partner_attrs[] = {
639 	&dev_attr_accessory_mode.attr,
640 	&dev_attr_supports_usb_power_delivery.attr,
641 	&dev_attr_number_of_alternate_modes.attr,
642 	&dev_attr_type.attr,
643 	&dev_attr_usb_power_delivery_revision.attr,
644 	NULL
645 };
646 
typec_partner_attr_is_visible(struct kobject * kobj,struct attribute * attr,int n)647 static umode_t typec_partner_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
648 {
649 	struct typec_partner *partner = to_typec_partner(kobj_to_dev(kobj));
650 
651 	if (attr == &dev_attr_number_of_alternate_modes.attr) {
652 		if (partner->num_altmodes < 0)
653 			return 0;
654 	}
655 
656 	if (attr == &dev_attr_type.attr)
657 		if (!get_pd_product_type(kobj_to_dev(kobj)))
658 			return 0;
659 
660 	return attr->mode;
661 }
662 
663 static const struct attribute_group typec_partner_group = {
664 	.is_visible = typec_partner_attr_is_visible,
665 	.attrs = typec_partner_attrs
666 };
667 
668 static const struct attribute_group *typec_partner_groups[] = {
669 	&typec_partner_group,
670 	NULL
671 };
672 
typec_partner_release(struct device * dev)673 static void typec_partner_release(struct device *dev)
674 {
675 	struct typec_partner *partner = to_typec_partner(dev);
676 
677 	ida_destroy(&partner->mode_ids);
678 	kfree(partner);
679 }
680 
681 const struct device_type typec_partner_dev_type = {
682 	.name = "typec_partner",
683 	.groups = typec_partner_groups,
684 	.release = typec_partner_release,
685 };
686 
687 /**
688  * typec_partner_set_identity - Report result from Discover Identity command
689  * @partner: The partner updated identity values
690  *
691  * This routine is used to report that the result of Discover Identity USB power
692  * delivery command has become available.
693  */
typec_partner_set_identity(struct typec_partner * partner)694 int typec_partner_set_identity(struct typec_partner *partner)
695 {
696 	if (!partner->identity)
697 		return -EINVAL;
698 
699 	typec_report_identity(&partner->dev);
700 	return 0;
701 }
702 EXPORT_SYMBOL_GPL(typec_partner_set_identity);
703 
704 /**
705  * typec_partner_set_pd_revision - Set the PD revision supported by the partner
706  * @partner: The partner to be updated.
707  * @pd_revision:  USB Power Delivery Specification Revision supported by partner
708  *
709  * This routine is used to report that the PD revision of the port partner has
710  * become available.
711  */
typec_partner_set_pd_revision(struct typec_partner * partner,u16 pd_revision)712 void typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision)
713 {
714 	if (partner->pd_revision == pd_revision)
715 		return;
716 
717 	partner->pd_revision = pd_revision;
718 	sysfs_notify(&partner->dev.kobj, NULL, "usb_power_delivery_revision");
719 	if (pd_revision != 0 && !partner->usb_pd) {
720 		partner->usb_pd = 1;
721 		sysfs_notify(&partner->dev.kobj, NULL,
722 			     "supports_usb_power_delivery");
723 	}
724 	kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
725 }
726 EXPORT_SYMBOL_GPL(typec_partner_set_pd_revision);
727 
728 /**
729  * typec_partner_set_usb_power_delivery - Declare USB Power Delivery Contract.
730  * @partner: The partner device.
731  * @pd: The USB PD instance.
732  *
733  * This routine can be used to declare USB Power Delivery Contract with @partner
734  * by linking @partner to @pd which contains the objects that were used during the
735  * negotiation of the contract.
736  *
737  * If @pd is NULL, the link is removed and the contract with @partner has ended.
738  */
typec_partner_set_usb_power_delivery(struct typec_partner * partner,struct usb_power_delivery * pd)739 int typec_partner_set_usb_power_delivery(struct typec_partner *partner,
740 					 struct usb_power_delivery *pd)
741 {
742 	int ret;
743 
744 	if (IS_ERR_OR_NULL(partner) || partner->pd == pd)
745 		return 0;
746 
747 	if (pd) {
748 		ret = usb_power_delivery_link_device(pd, &partner->dev);
749 		if (ret)
750 			return ret;
751 	} else {
752 		usb_power_delivery_unlink_device(partner->pd, &partner->dev);
753 	}
754 
755 	partner->pd = pd;
756 
757 	return 0;
758 }
759 EXPORT_SYMBOL_GPL(typec_partner_set_usb_power_delivery);
760 
761 /**
762  * typec_partner_set_num_altmodes - Set the number of available partner altmodes
763  * @partner: The partner to be updated.
764  * @num_altmodes: The number of altmodes we want to specify as available.
765  *
766  * This routine is used to report the number of alternate modes supported by the
767  * partner. This value is *not* enforced in alternate mode registration routines.
768  *
769  * @partner.num_altmodes is set to -1 on partner registration, denoting that
770  * a valid value has not been set for it yet.
771  *
772  * Returns 0 on success or negative error number on failure.
773  */
typec_partner_set_num_altmodes(struct typec_partner * partner,int num_altmodes)774 int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes)
775 {
776 	int ret;
777 
778 	if (num_altmodes < 0)
779 		return -EINVAL;
780 
781 	partner->num_altmodes = num_altmodes;
782 	ret = sysfs_update_group(&partner->dev.kobj, &typec_partner_group);
783 	if (ret < 0)
784 		return ret;
785 
786 	sysfs_notify(&partner->dev.kobj, NULL, "number_of_alternate_modes");
787 	kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
788 
789 	return 0;
790 }
791 EXPORT_SYMBOL_GPL(typec_partner_set_num_altmodes);
792 
793 /**
794  * typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode
795  * @partner: USB Type-C Partner that supports the alternate mode
796  * @desc: Description of the alternate mode
797  *
798  * This routine is used to register each alternate mode individually that
799  * @partner has listed in response to Discover SVIDs command. The modes for a
800  * SVID listed in response to Discover Modes command need to be listed in an
801  * array in @desc.
802  *
803  * Returns handle to the alternate mode on success or ERR_PTR on failure.
804  */
805 struct typec_altmode *
typec_partner_register_altmode(struct typec_partner * partner,const struct typec_altmode_desc * desc)806 typec_partner_register_altmode(struct typec_partner *partner,
807 			       const struct typec_altmode_desc *desc)
808 {
809 	return typec_register_altmode(&partner->dev, desc);
810 }
811 EXPORT_SYMBOL_GPL(typec_partner_register_altmode);
812 
813 /**
814  * typec_partner_set_svdm_version - Set negotiated Structured VDM (SVDM) Version
815  * @partner: USB Type-C Partner that supports SVDM
816  * @svdm_version: Negotiated SVDM Version
817  *
818  * This routine is used to save the negotiated SVDM Version.
819  */
typec_partner_set_svdm_version(struct typec_partner * partner,enum usb_pd_svdm_ver svdm_version)820 void typec_partner_set_svdm_version(struct typec_partner *partner,
821 				   enum usb_pd_svdm_ver svdm_version)
822 {
823 	partner->svdm_version = svdm_version;
824 }
825 EXPORT_SYMBOL_GPL(typec_partner_set_svdm_version);
826 
827 /**
828  * typec_partner_usb_power_delivery_register - Register Type-C partner USB Power Delivery Support
829  * @partner: Type-C partner device.
830  * @desc: Description of the USB PD contract.
831  *
832  * This routine is a wrapper around usb_power_delivery_register(). It registers
833  * USB Power Delivery Capabilities for a Type-C partner device. Specifically,
834  * it sets the Type-C partner device as a parent for the resulting USB Power Delivery object.
835  *
836  * Returns handle to struct usb_power_delivery or ERR_PTR.
837  */
838 struct usb_power_delivery *
typec_partner_usb_power_delivery_register(struct typec_partner * partner,struct usb_power_delivery_desc * desc)839 typec_partner_usb_power_delivery_register(struct typec_partner *partner,
840 					  struct usb_power_delivery_desc *desc)
841 {
842 	return usb_power_delivery_register(&partner->dev, desc);
843 }
844 EXPORT_SYMBOL_GPL(typec_partner_usb_power_delivery_register);
845 
846 /**
847  * typec_register_partner - Register a USB Type-C Partner
848  * @port: The USB Type-C Port the partner is connected to
849  * @desc: Description of the partner
850  *
851  * Registers a device for USB Type-C Partner described in @desc.
852  *
853  * Returns handle to the partner on success or ERR_PTR on failure.
854  */
typec_register_partner(struct typec_port * port,struct typec_partner_desc * desc)855 struct typec_partner *typec_register_partner(struct typec_port *port,
856 					     struct typec_partner_desc *desc)
857 {
858 	struct typec_partner *partner;
859 	int ret;
860 
861 	partner = kzalloc(sizeof(*partner), GFP_KERNEL);
862 	if (!partner)
863 		return ERR_PTR(-ENOMEM);
864 
865 	ida_init(&partner->mode_ids);
866 	partner->usb_pd = desc->usb_pd;
867 	partner->accessory = desc->accessory;
868 	partner->num_altmodes = -1;
869 	partner->pd_revision = desc->pd_revision;
870 	partner->svdm_version = port->cap->svdm_version;
871 
872 	if (desc->identity) {
873 		/*
874 		 * Creating directory for the identity only if the driver is
875 		 * able to provide data to it.
876 		 */
877 		partner->dev.groups = usb_pd_id_groups;
878 		partner->identity = desc->identity;
879 	}
880 
881 	partner->dev.class = &typec_class;
882 	partner->dev.parent = &port->dev;
883 	partner->dev.type = &typec_partner_dev_type;
884 	dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev));
885 
886 	ret = device_register(&partner->dev);
887 	if (ret) {
888 		dev_err(&port->dev, "failed to register partner (%d)\n", ret);
889 		put_device(&partner->dev);
890 		return ERR_PTR(ret);
891 	}
892 
893 	return partner;
894 }
895 EXPORT_SYMBOL_GPL(typec_register_partner);
896 
897 /**
898  * typec_unregister_partner - Unregister a USB Type-C Partner
899  * @partner: The partner to be unregistered
900  *
901  * Unregister device created with typec_register_partner().
902  */
typec_unregister_partner(struct typec_partner * partner)903 void typec_unregister_partner(struct typec_partner *partner)
904 {
905 	if (!IS_ERR_OR_NULL(partner))
906 		device_unregister(&partner->dev);
907 }
908 EXPORT_SYMBOL_GPL(typec_unregister_partner);
909 
910 /* ------------------------------------------------------------------------- */
911 /* Type-C Cable Plugs */
912 
typec_plug_release(struct device * dev)913 static void typec_plug_release(struct device *dev)
914 {
915 	struct typec_plug *plug = to_typec_plug(dev);
916 
917 	ida_destroy(&plug->mode_ids);
918 	kfree(plug);
919 }
920 
921 static struct attribute *typec_plug_attrs[] = {
922 	&dev_attr_number_of_alternate_modes.attr,
923 	NULL
924 };
925 
typec_plug_attr_is_visible(struct kobject * kobj,struct attribute * attr,int n)926 static umode_t typec_plug_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
927 {
928 	struct typec_plug *plug = to_typec_plug(kobj_to_dev(kobj));
929 
930 	if (attr == &dev_attr_number_of_alternate_modes.attr) {
931 		if (plug->num_altmodes < 0)
932 			return 0;
933 	}
934 
935 	return attr->mode;
936 }
937 
938 static const struct attribute_group typec_plug_group = {
939 	.is_visible = typec_plug_attr_is_visible,
940 	.attrs = typec_plug_attrs
941 };
942 
943 static const struct attribute_group *typec_plug_groups[] = {
944 	&typec_plug_group,
945 	NULL
946 };
947 
948 const struct device_type typec_plug_dev_type = {
949 	.name = "typec_plug",
950 	.groups = typec_plug_groups,
951 	.release = typec_plug_release,
952 };
953 
954 /**
955  * typec_plug_set_num_altmodes - Set the number of available plug altmodes
956  * @plug: The plug to be updated.
957  * @num_altmodes: The number of altmodes we want to specify as available.
958  *
959  * This routine is used to report the number of alternate modes supported by the
960  * plug. This value is *not* enforced in alternate mode registration routines.
961  *
962  * @plug.num_altmodes is set to -1 on plug registration, denoting that
963  * a valid value has not been set for it yet.
964  *
965  * Returns 0 on success or negative error number on failure.
966  */
typec_plug_set_num_altmodes(struct typec_plug * plug,int num_altmodes)967 int typec_plug_set_num_altmodes(struct typec_plug *plug, int num_altmodes)
968 {
969 	int ret;
970 
971 	if (num_altmodes < 0)
972 		return -EINVAL;
973 
974 	plug->num_altmodes = num_altmodes;
975 	ret = sysfs_update_group(&plug->dev.kobj, &typec_plug_group);
976 	if (ret < 0)
977 		return ret;
978 
979 	sysfs_notify(&plug->dev.kobj, NULL, "number_of_alternate_modes");
980 	kobject_uevent(&plug->dev.kobj, KOBJ_CHANGE);
981 
982 	return 0;
983 }
984 EXPORT_SYMBOL_GPL(typec_plug_set_num_altmodes);
985 
986 /**
987  * typec_plug_register_altmode - Register USB Type-C Cable Plug Alternate Mode
988  * @plug: USB Type-C Cable Plug that supports the alternate mode
989  * @desc: Description of the alternate mode
990  *
991  * This routine is used to register each alternate mode individually that @plug
992  * has listed in response to Discover SVIDs command. The modes for a SVID that
993  * the plug lists in response to Discover Modes command need to be listed in an
994  * array in @desc.
995  *
996  * Returns handle to the alternate mode on success or ERR_PTR on failure.
997  */
998 struct typec_altmode *
typec_plug_register_altmode(struct typec_plug * plug,const struct typec_altmode_desc * desc)999 typec_plug_register_altmode(struct typec_plug *plug,
1000 			    const struct typec_altmode_desc *desc)
1001 {
1002 	return typec_register_altmode(&plug->dev, desc);
1003 }
1004 EXPORT_SYMBOL_GPL(typec_plug_register_altmode);
1005 
1006 /**
1007  * typec_register_plug - Register a USB Type-C Cable Plug
1008  * @cable: USB Type-C Cable with the plug
1009  * @desc: Description of the cable plug
1010  *
1011  * Registers a device for USB Type-C Cable Plug described in @desc. A USB Type-C
1012  * Cable Plug represents a plug with electronics in it that can response to USB
1013  * Power Delivery SOP Prime or SOP Double Prime packages.
1014  *
1015  * Returns handle to the cable plug on success or ERR_PTR on failure.
1016  */
typec_register_plug(struct typec_cable * cable,struct typec_plug_desc * desc)1017 struct typec_plug *typec_register_plug(struct typec_cable *cable,
1018 				       struct typec_plug_desc *desc)
1019 {
1020 	struct typec_plug *plug;
1021 	char name[8];
1022 	int ret;
1023 
1024 	plug = kzalloc(sizeof(*plug), GFP_KERNEL);
1025 	if (!plug)
1026 		return ERR_PTR(-ENOMEM);
1027 
1028 	sprintf(name, "plug%d", desc->index);
1029 
1030 	ida_init(&plug->mode_ids);
1031 	plug->num_altmodes = -1;
1032 	plug->index = desc->index;
1033 	plug->dev.class = &typec_class;
1034 	plug->dev.parent = &cable->dev;
1035 	plug->dev.type = &typec_plug_dev_type;
1036 	dev_set_name(&plug->dev, "%s-%s", dev_name(cable->dev.parent), name);
1037 
1038 	ret = device_register(&plug->dev);
1039 	if (ret) {
1040 		dev_err(&cable->dev, "failed to register plug (%d)\n", ret);
1041 		put_device(&plug->dev);
1042 		return ERR_PTR(ret);
1043 	}
1044 
1045 	return plug;
1046 }
1047 EXPORT_SYMBOL_GPL(typec_register_plug);
1048 
1049 /**
1050  * typec_unregister_plug - Unregister a USB Type-C Cable Plug
1051  * @plug: The cable plug to be unregistered
1052  *
1053  * Unregister device created with typec_register_plug().
1054  */
typec_unregister_plug(struct typec_plug * plug)1055 void typec_unregister_plug(struct typec_plug *plug)
1056 {
1057 	if (!IS_ERR_OR_NULL(plug))
1058 		device_unregister(&plug->dev);
1059 }
1060 EXPORT_SYMBOL_GPL(typec_unregister_plug);
1061 
1062 /* Type-C Cables */
1063 
1064 static const char * const typec_plug_types[] = {
1065 	[USB_PLUG_NONE]		= "unknown",
1066 	[USB_PLUG_TYPE_A]	= "type-a",
1067 	[USB_PLUG_TYPE_B]	= "type-b",
1068 	[USB_PLUG_TYPE_C]	= "type-c",
1069 	[USB_PLUG_CAPTIVE]	= "captive",
1070 };
1071 
plug_type_show(struct device * dev,struct device_attribute * attr,char * buf)1072 static ssize_t plug_type_show(struct device *dev,
1073 			      struct device_attribute *attr, char *buf)
1074 {
1075 	struct typec_cable *cable = to_typec_cable(dev);
1076 
1077 	return sprintf(buf, "%s\n", typec_plug_types[cable->type]);
1078 }
1079 static DEVICE_ATTR_RO(plug_type);
1080 
1081 static struct attribute *typec_cable_attrs[] = {
1082 	&dev_attr_type.attr,
1083 	&dev_attr_plug_type.attr,
1084 	&dev_attr_usb_power_delivery_revision.attr,
1085 	NULL
1086 };
1087 ATTRIBUTE_GROUPS(typec_cable);
1088 
typec_cable_release(struct device * dev)1089 static void typec_cable_release(struct device *dev)
1090 {
1091 	struct typec_cable *cable = to_typec_cable(dev);
1092 
1093 	kfree(cable);
1094 }
1095 
1096 const struct device_type typec_cable_dev_type = {
1097 	.name = "typec_cable",
1098 	.groups = typec_cable_groups,
1099 	.release = typec_cable_release,
1100 };
1101 
cable_match(struct device * dev,void * data)1102 static int cable_match(struct device *dev, void *data)
1103 {
1104 	return is_typec_cable(dev);
1105 }
1106 
1107 /**
1108  * typec_cable_get - Get a reference to the USB Type-C cable
1109  * @port: The USB Type-C Port the cable is connected to
1110  *
1111  * The caller must decrement the reference count with typec_cable_put() after
1112  * use.
1113  */
typec_cable_get(struct typec_port * port)1114 struct typec_cable *typec_cable_get(struct typec_port *port)
1115 {
1116 	struct device *dev;
1117 
1118 	dev = device_find_child(&port->dev, NULL, cable_match);
1119 	if (!dev)
1120 		return NULL;
1121 
1122 	return to_typec_cable(dev);
1123 }
1124 EXPORT_SYMBOL_GPL(typec_cable_get);
1125 
1126 /**
1127  * typec_cable_put - Decrement the reference count on USB Type-C cable
1128  * @cable: The USB Type-C cable
1129  */
typec_cable_put(struct typec_cable * cable)1130 void typec_cable_put(struct typec_cable *cable)
1131 {
1132 	put_device(&cable->dev);
1133 }
1134 EXPORT_SYMBOL_GPL(typec_cable_put);
1135 
1136 /**
1137  * typec_cable_is_active - Check is the USB Type-C cable active or passive
1138  * @cable: The USB Type-C Cable
1139  *
1140  * Return 1 if the cable is active or 0 if it's passive.
1141  */
typec_cable_is_active(struct typec_cable * cable)1142 int typec_cable_is_active(struct typec_cable *cable)
1143 {
1144 	return cable->active;
1145 }
1146 EXPORT_SYMBOL_GPL(typec_cable_is_active);
1147 
1148 /**
1149  * typec_cable_set_identity - Report result from Discover Identity command
1150  * @cable: The cable updated identity values
1151  *
1152  * This routine is used to report that the result of Discover Identity USB power
1153  * delivery command has become available.
1154  */
typec_cable_set_identity(struct typec_cable * cable)1155 int typec_cable_set_identity(struct typec_cable *cable)
1156 {
1157 	if (!cable->identity)
1158 		return -EINVAL;
1159 
1160 	typec_report_identity(&cable->dev);
1161 	return 0;
1162 }
1163 EXPORT_SYMBOL_GPL(typec_cable_set_identity);
1164 
1165 /**
1166  * typec_register_cable - Register a USB Type-C Cable
1167  * @port: The USB Type-C Port the cable is connected to
1168  * @desc: Description of the cable
1169  *
1170  * Registers a device for USB Type-C Cable described in @desc. The cable will be
1171  * parent for the optional cable plug devises.
1172  *
1173  * Returns handle to the cable on success or ERR_PTR on failure.
1174  */
typec_register_cable(struct typec_port * port,struct typec_cable_desc * desc)1175 struct typec_cable *typec_register_cable(struct typec_port *port,
1176 					 struct typec_cable_desc *desc)
1177 {
1178 	struct typec_cable *cable;
1179 	int ret;
1180 
1181 	cable = kzalloc(sizeof(*cable), GFP_KERNEL);
1182 	if (!cable)
1183 		return ERR_PTR(-ENOMEM);
1184 
1185 	cable->type = desc->type;
1186 	cable->active = desc->active;
1187 	cable->pd_revision = desc->pd_revision;
1188 
1189 	if (desc->identity) {
1190 		/*
1191 		 * Creating directory for the identity only if the driver is
1192 		 * able to provide data to it.
1193 		 */
1194 		cable->dev.groups = usb_pd_id_groups;
1195 		cable->identity = desc->identity;
1196 	}
1197 
1198 	cable->dev.class = &typec_class;
1199 	cable->dev.parent = &port->dev;
1200 	cable->dev.type = &typec_cable_dev_type;
1201 	dev_set_name(&cable->dev, "%s-cable", dev_name(&port->dev));
1202 
1203 	ret = device_register(&cable->dev);
1204 	if (ret) {
1205 		dev_err(&port->dev, "failed to register cable (%d)\n", ret);
1206 		put_device(&cable->dev);
1207 		return ERR_PTR(ret);
1208 	}
1209 
1210 	return cable;
1211 }
1212 EXPORT_SYMBOL_GPL(typec_register_cable);
1213 
1214 /**
1215  * typec_unregister_cable - Unregister a USB Type-C Cable
1216  * @cable: The cable to be unregistered
1217  *
1218  * Unregister device created with typec_register_cable().
1219  */
typec_unregister_cable(struct typec_cable * cable)1220 void typec_unregister_cable(struct typec_cable *cable)
1221 {
1222 	if (!IS_ERR_OR_NULL(cable))
1223 		device_unregister(&cable->dev);
1224 }
1225 EXPORT_SYMBOL_GPL(typec_unregister_cable);
1226 
1227 /* ------------------------------------------------------------------------- */
1228 /* USB Type-C ports */
1229 
1230 /**
1231  * typec_port_set_usb_power_delivery - Assign USB PD for port.
1232  * @port: USB Type-C port.
1233  * @pd: USB PD instance.
1234  *
1235  * This routine can be used to set the USB Power Delivery Capabilities for @port
1236  * that it will advertise to the partner.
1237  *
1238  * If @pd is NULL, the assignment is removed.
1239  */
typec_port_set_usb_power_delivery(struct typec_port * port,struct usb_power_delivery * pd)1240 int typec_port_set_usb_power_delivery(struct typec_port *port, struct usb_power_delivery *pd)
1241 {
1242 	int ret;
1243 
1244 	if (IS_ERR_OR_NULL(port) || port->pd == pd)
1245 		return 0;
1246 
1247 	if (pd) {
1248 		ret = usb_power_delivery_link_device(pd, &port->dev);
1249 		if (ret)
1250 			return ret;
1251 	} else {
1252 		usb_power_delivery_unlink_device(port->pd, &port->dev);
1253 	}
1254 
1255 	port->pd = pd;
1256 
1257 	return 0;
1258 }
1259 EXPORT_SYMBOL_GPL(typec_port_set_usb_power_delivery);
1260 
select_usb_power_delivery_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)1261 static ssize_t select_usb_power_delivery_store(struct device *dev,
1262 					       struct device_attribute *attr,
1263 					       const char *buf, size_t size)
1264 {
1265 	struct typec_port *port = to_typec_port(dev);
1266 	struct usb_power_delivery *pd;
1267 
1268 	if (!port->ops || !port->ops->pd_set)
1269 		return -EOPNOTSUPP;
1270 
1271 	pd = usb_power_delivery_find(buf);
1272 	if (!pd)
1273 		return -EINVAL;
1274 
1275 	return port->ops->pd_set(port, pd);
1276 }
1277 
select_usb_power_delivery_show(struct device * dev,struct device_attribute * attr,char * buf)1278 static ssize_t select_usb_power_delivery_show(struct device *dev,
1279 					      struct device_attribute *attr, char *buf)
1280 {
1281 	struct typec_port *port = to_typec_port(dev);
1282 	struct usb_power_delivery **pds;
1283 	int i, ret = 0;
1284 
1285 	if (!port->ops || !port->ops->pd_get)
1286 		return -EOPNOTSUPP;
1287 
1288 	pds = port->ops->pd_get(port);
1289 	if (!pds)
1290 		return 0;
1291 
1292 	for (i = 0; pds[i]; i++) {
1293 		if (pds[i] == port->pd)
1294 			ret += sysfs_emit_at(buf, ret, "[%s] ", dev_name(&pds[i]->dev));
1295 		else
1296 			ret += sysfs_emit_at(buf, ret, "%s ", dev_name(&pds[i]->dev));
1297 	}
1298 
1299 	buf[ret - 1] = '\n';
1300 
1301 	return ret;
1302 }
1303 static DEVICE_ATTR_RW(select_usb_power_delivery);
1304 
1305 static struct attribute *port_attrs[] = {
1306 	&dev_attr_select_usb_power_delivery.attr,
1307 	NULL
1308 };
1309 
port_attr_is_visible(struct kobject * kobj,struct attribute * attr,int n)1310 static umode_t port_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
1311 {
1312 	struct typec_port *port = to_typec_port(kobj_to_dev(kobj));
1313 
1314 	if (!port->pd || !port->ops || !port->ops->pd_get)
1315 		return 0;
1316 	if (!port->ops->pd_set)
1317 		return 0444;
1318 
1319 	return attr->mode;
1320 }
1321 
1322 static const struct attribute_group pd_group = {
1323 	.is_visible = port_attr_is_visible,
1324 	.attrs = port_attrs,
1325 };
1326 
1327 static const char * const typec_orientations[] = {
1328 	[TYPEC_ORIENTATION_NONE]	= "unknown",
1329 	[TYPEC_ORIENTATION_NORMAL]	= "normal",
1330 	[TYPEC_ORIENTATION_REVERSE]	= "reverse",
1331 };
1332 
1333 static const char * const typec_roles[] = {
1334 	[TYPEC_SINK]	= "sink",
1335 	[TYPEC_SOURCE]	= "source",
1336 };
1337 
1338 static const char * const typec_data_roles[] = {
1339 	[TYPEC_DEVICE]	= "device",
1340 	[TYPEC_HOST]	= "host",
1341 };
1342 
1343 static const char * const typec_port_power_roles[] = {
1344 	[TYPEC_PORT_SRC] = "source",
1345 	[TYPEC_PORT_SNK] = "sink",
1346 	[TYPEC_PORT_DRP] = "dual",
1347 };
1348 
1349 static const char * const typec_port_data_roles[] = {
1350 	[TYPEC_PORT_DFP] = "host",
1351 	[TYPEC_PORT_UFP] = "device",
1352 	[TYPEC_PORT_DRD] = "dual",
1353 };
1354 
1355 static const char * const typec_port_types_drp[] = {
1356 	[TYPEC_PORT_SRC] = "dual [source] sink",
1357 	[TYPEC_PORT_SNK] = "dual source [sink]",
1358 	[TYPEC_PORT_DRP] = "[dual] source sink",
1359 };
1360 
1361 static ssize_t
preferred_role_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)1362 preferred_role_store(struct device *dev, struct device_attribute *attr,
1363 		     const char *buf, size_t size)
1364 {
1365 	struct typec_port *port = to_typec_port(dev);
1366 	int role;
1367 	int ret;
1368 
1369 	if (port->cap->type != TYPEC_PORT_DRP) {
1370 		dev_dbg(dev, "Preferred role only supported with DRP ports\n");
1371 		return -EOPNOTSUPP;
1372 	}
1373 
1374 	if (!port->ops || !port->ops->try_role) {
1375 		dev_dbg(dev, "Setting preferred role not supported\n");
1376 		return -EOPNOTSUPP;
1377 	}
1378 
1379 	role = sysfs_match_string(typec_roles, buf);
1380 	if (role < 0) {
1381 		if (sysfs_streq(buf, "none"))
1382 			role = TYPEC_NO_PREFERRED_ROLE;
1383 		else
1384 			return -EINVAL;
1385 	}
1386 
1387 	ret = port->ops->try_role(port, role);
1388 	if (ret)
1389 		return ret;
1390 
1391 	port->prefer_role = role;
1392 	return size;
1393 }
1394 
1395 static ssize_t
preferred_role_show(struct device * dev,struct device_attribute * attr,char * buf)1396 preferred_role_show(struct device *dev, struct device_attribute *attr,
1397 		    char *buf)
1398 {
1399 	struct typec_port *port = to_typec_port(dev);
1400 
1401 	if (port->cap->type != TYPEC_PORT_DRP)
1402 		return 0;
1403 
1404 	if (port->prefer_role < 0)
1405 		return 0;
1406 
1407 	return sprintf(buf, "%s\n", typec_roles[port->prefer_role]);
1408 }
1409 static DEVICE_ATTR_RW(preferred_role);
1410 
data_role_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)1411 static ssize_t data_role_store(struct device *dev,
1412 			       struct device_attribute *attr,
1413 			       const char *buf, size_t size)
1414 {
1415 	struct typec_port *port = to_typec_port(dev);
1416 	int ret;
1417 
1418 	if (!port->ops || !port->ops->dr_set) {
1419 		dev_dbg(dev, "data role swapping not supported\n");
1420 		return -EOPNOTSUPP;
1421 	}
1422 
1423 	ret = sysfs_match_string(typec_data_roles, buf);
1424 	if (ret < 0)
1425 		return ret;
1426 
1427 	mutex_lock(&port->port_type_lock);
1428 	if (port->cap->data != TYPEC_PORT_DRD) {
1429 		ret = -EOPNOTSUPP;
1430 		goto unlock_and_ret;
1431 	}
1432 
1433 	ret = port->ops->dr_set(port, ret);
1434 	if (ret)
1435 		goto unlock_and_ret;
1436 
1437 	ret = size;
1438 unlock_and_ret:
1439 	mutex_unlock(&port->port_type_lock);
1440 	return ret;
1441 }
1442 
data_role_show(struct device * dev,struct device_attribute * attr,char * buf)1443 static ssize_t data_role_show(struct device *dev,
1444 			      struct device_attribute *attr, char *buf)
1445 {
1446 	struct typec_port *port = to_typec_port(dev);
1447 
1448 	if (port->cap->data == TYPEC_PORT_DRD)
1449 		return sprintf(buf, "%s\n", port->data_role == TYPEC_HOST ?
1450 			       "[host] device" : "host [device]");
1451 
1452 	return sprintf(buf, "[%s]\n", typec_data_roles[port->data_role]);
1453 }
1454 static DEVICE_ATTR_RW(data_role);
1455 
power_role_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)1456 static ssize_t power_role_store(struct device *dev,
1457 				struct device_attribute *attr,
1458 				const char *buf, size_t size)
1459 {
1460 	struct typec_port *port = to_typec_port(dev);
1461 	int ret;
1462 
1463 	if (!port->ops || !port->ops->pr_set) {
1464 		dev_dbg(dev, "power role swapping not supported\n");
1465 		return -EOPNOTSUPP;
1466 	}
1467 
1468 	if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
1469 		dev_dbg(dev, "partner unable to swap power role\n");
1470 		return -EIO;
1471 	}
1472 
1473 	ret = sysfs_match_string(typec_roles, buf);
1474 	if (ret < 0)
1475 		return ret;
1476 
1477 	mutex_lock(&port->port_type_lock);
1478 	if (port->port_type != TYPEC_PORT_DRP) {
1479 		dev_dbg(dev, "port type fixed at \"%s\"",
1480 			     typec_port_power_roles[port->port_type]);
1481 		ret = -EOPNOTSUPP;
1482 		goto unlock_and_ret;
1483 	}
1484 
1485 	ret = port->ops->pr_set(port, ret);
1486 	if (ret)
1487 		goto unlock_and_ret;
1488 
1489 	ret = size;
1490 unlock_and_ret:
1491 	mutex_unlock(&port->port_type_lock);
1492 	return ret;
1493 }
1494 
power_role_show(struct device * dev,struct device_attribute * attr,char * buf)1495 static ssize_t power_role_show(struct device *dev,
1496 			       struct device_attribute *attr, char *buf)
1497 {
1498 	struct typec_port *port = to_typec_port(dev);
1499 
1500 	if (port->cap->type == TYPEC_PORT_DRP)
1501 		return sprintf(buf, "%s\n", port->pwr_role == TYPEC_SOURCE ?
1502 			       "[source] sink" : "source [sink]");
1503 
1504 	return sprintf(buf, "[%s]\n", typec_roles[port->pwr_role]);
1505 }
1506 static DEVICE_ATTR_RW(power_role);
1507 
1508 static ssize_t
port_type_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)1509 port_type_store(struct device *dev, struct device_attribute *attr,
1510 			const char *buf, size_t size)
1511 {
1512 	struct typec_port *port = to_typec_port(dev);
1513 	int ret;
1514 	enum typec_port_type type;
1515 
1516 	if (port->cap->type != TYPEC_PORT_DRP ||
1517 	    !port->ops || !port->ops->port_type_set) {
1518 		dev_dbg(dev, "changing port type not supported\n");
1519 		return -EOPNOTSUPP;
1520 	}
1521 
1522 	ret = sysfs_match_string(typec_port_power_roles, buf);
1523 	if (ret < 0)
1524 		return ret;
1525 
1526 	type = ret;
1527 	mutex_lock(&port->port_type_lock);
1528 
1529 	if (port->port_type == type) {
1530 		ret = size;
1531 		goto unlock_and_ret;
1532 	}
1533 
1534 	ret = port->ops->port_type_set(port, type);
1535 	if (ret)
1536 		goto unlock_and_ret;
1537 
1538 	port->port_type = type;
1539 	ret = size;
1540 
1541 unlock_and_ret:
1542 	mutex_unlock(&port->port_type_lock);
1543 	return ret;
1544 }
1545 
1546 static ssize_t
port_type_show(struct device * dev,struct device_attribute * attr,char * buf)1547 port_type_show(struct device *dev, struct device_attribute *attr,
1548 		char *buf)
1549 {
1550 	struct typec_port *port = to_typec_port(dev);
1551 
1552 	if (port->cap->type == TYPEC_PORT_DRP)
1553 		return sprintf(buf, "%s\n",
1554 			       typec_port_types_drp[port->port_type]);
1555 
1556 	return sprintf(buf, "[%s]\n", typec_port_power_roles[port->cap->type]);
1557 }
1558 static DEVICE_ATTR_RW(port_type);
1559 
1560 static const char * const typec_pwr_opmodes[] = {
1561 	[TYPEC_PWR_MODE_USB]	= "default",
1562 	[TYPEC_PWR_MODE_1_5A]	= "1.5A",
1563 	[TYPEC_PWR_MODE_3_0A]	= "3.0A",
1564 	[TYPEC_PWR_MODE_PD]	= "usb_power_delivery",
1565 };
1566 
power_operation_mode_show(struct device * dev,struct device_attribute * attr,char * buf)1567 static ssize_t power_operation_mode_show(struct device *dev,
1568 					 struct device_attribute *attr,
1569 					 char *buf)
1570 {
1571 	struct typec_port *port = to_typec_port(dev);
1572 
1573 	return sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]);
1574 }
1575 static DEVICE_ATTR_RO(power_operation_mode);
1576 
vconn_source_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)1577 static ssize_t vconn_source_store(struct device *dev,
1578 				  struct device_attribute *attr,
1579 				  const char *buf, size_t size)
1580 {
1581 	struct typec_port *port = to_typec_port(dev);
1582 	bool source;
1583 	int ret;
1584 
1585 	if (!port->cap->pd_revision) {
1586 		dev_dbg(dev, "VCONN swap depends on USB Power Delivery\n");
1587 		return -EOPNOTSUPP;
1588 	}
1589 
1590 	if (!port->ops || !port->ops->vconn_set) {
1591 		dev_dbg(dev, "VCONN swapping not supported\n");
1592 		return -EOPNOTSUPP;
1593 	}
1594 
1595 	ret = kstrtobool(buf, &source);
1596 	if (ret)
1597 		return ret;
1598 
1599 	ret = port->ops->vconn_set(port, (enum typec_role)source);
1600 	if (ret)
1601 		return ret;
1602 
1603 	return size;
1604 }
1605 
vconn_source_show(struct device * dev,struct device_attribute * attr,char * buf)1606 static ssize_t vconn_source_show(struct device *dev,
1607 				 struct device_attribute *attr, char *buf)
1608 {
1609 	struct typec_port *port = to_typec_port(dev);
1610 
1611 	return sprintf(buf, "%s\n",
1612 		       port->vconn_role == TYPEC_SOURCE ? "yes" : "no");
1613 }
1614 static DEVICE_ATTR_RW(vconn_source);
1615 
supported_accessory_modes_show(struct device * dev,struct device_attribute * attr,char * buf)1616 static ssize_t supported_accessory_modes_show(struct device *dev,
1617 					      struct device_attribute *attr,
1618 					      char *buf)
1619 {
1620 	struct typec_port *port = to_typec_port(dev);
1621 	ssize_t ret = 0;
1622 	int i;
1623 
1624 	for (i = 0; i < ARRAY_SIZE(port->cap->accessory); i++) {
1625 		if (port->cap->accessory[i])
1626 			ret += sprintf(buf + ret, "%s ",
1627 			       typec_accessory_modes[port->cap->accessory[i]]);
1628 	}
1629 
1630 	if (!ret)
1631 		return sprintf(buf, "none\n");
1632 
1633 	buf[ret - 1] = '\n';
1634 
1635 	return ret;
1636 }
1637 static DEVICE_ATTR_RO(supported_accessory_modes);
1638 
usb_typec_revision_show(struct device * dev,struct device_attribute * attr,char * buf)1639 static ssize_t usb_typec_revision_show(struct device *dev,
1640 				       struct device_attribute *attr,
1641 				       char *buf)
1642 {
1643 	struct typec_port *port = to_typec_port(dev);
1644 	u16 rev = port->cap->revision;
1645 
1646 	return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
1647 }
1648 static DEVICE_ATTR_RO(usb_typec_revision);
1649 
usb_power_delivery_revision_show(struct device * dev,struct device_attribute * attr,char * buf)1650 static ssize_t usb_power_delivery_revision_show(struct device *dev,
1651 						struct device_attribute *attr,
1652 						char *buf)
1653 {
1654 	u16 rev = 0;
1655 
1656 	if (is_typec_partner(dev)) {
1657 		struct typec_partner *partner = to_typec_partner(dev);
1658 
1659 		rev = partner->pd_revision;
1660 	} else if (is_typec_cable(dev)) {
1661 		struct typec_cable *cable = to_typec_cable(dev);
1662 
1663 		rev = cable->pd_revision;
1664 	} else if (is_typec_port(dev)) {
1665 		struct typec_port *p = to_typec_port(dev);
1666 
1667 		rev = p->cap->pd_revision;
1668 	}
1669 	return sysfs_emit(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
1670 }
1671 
orientation_show(struct device * dev,struct device_attribute * attr,char * buf)1672 static ssize_t orientation_show(struct device *dev,
1673 				   struct device_attribute *attr,
1674 				   char *buf)
1675 {
1676 	struct typec_port *port = to_typec_port(dev);
1677 
1678 	return sprintf(buf, "%s\n", typec_orientations[port->orientation]);
1679 }
1680 static DEVICE_ATTR_RO(orientation);
1681 
1682 static struct attribute *typec_attrs[] = {
1683 	&dev_attr_data_role.attr,
1684 	&dev_attr_power_operation_mode.attr,
1685 	&dev_attr_power_role.attr,
1686 	&dev_attr_preferred_role.attr,
1687 	&dev_attr_supported_accessory_modes.attr,
1688 	&dev_attr_usb_power_delivery_revision.attr,
1689 	&dev_attr_usb_typec_revision.attr,
1690 	&dev_attr_vconn_source.attr,
1691 	&dev_attr_port_type.attr,
1692 	&dev_attr_orientation.attr,
1693 	NULL,
1694 };
1695 
typec_attr_is_visible(struct kobject * kobj,struct attribute * attr,int n)1696 static umode_t typec_attr_is_visible(struct kobject *kobj,
1697 				     struct attribute *attr, int n)
1698 {
1699 	struct typec_port *port = to_typec_port(kobj_to_dev(kobj));
1700 
1701 	if (attr == &dev_attr_data_role.attr) {
1702 		if (port->cap->data != TYPEC_PORT_DRD ||
1703 		    !port->ops || !port->ops->dr_set)
1704 			return 0444;
1705 	} else if (attr == &dev_attr_power_role.attr) {
1706 		if (port->cap->type != TYPEC_PORT_DRP ||
1707 		    !port->ops || !port->ops->pr_set)
1708 			return 0444;
1709 	} else if (attr == &dev_attr_vconn_source.attr) {
1710 		if (!port->cap->pd_revision ||
1711 		    !port->ops || !port->ops->vconn_set)
1712 			return 0444;
1713 	} else if (attr == &dev_attr_preferred_role.attr) {
1714 		if (port->cap->type != TYPEC_PORT_DRP ||
1715 		    !port->ops || !port->ops->try_role)
1716 			return 0444;
1717 	} else if (attr == &dev_attr_port_type.attr) {
1718 		if (!port->ops || !port->ops->port_type_set)
1719 			return 0;
1720 		if (port->cap->type != TYPEC_PORT_DRP)
1721 			return 0444;
1722 	} else if (attr == &dev_attr_orientation.attr) {
1723 		if (port->cap->orientation_aware)
1724 			return 0444;
1725 		return 0;
1726 	}
1727 
1728 	return attr->mode;
1729 }
1730 
1731 static const struct attribute_group typec_group = {
1732 	.is_visible = typec_attr_is_visible,
1733 	.attrs = typec_attrs,
1734 };
1735 
1736 static const struct attribute_group *typec_groups[] = {
1737 	&typec_group,
1738 	&pd_group,
1739 	NULL
1740 };
1741 
typec_uevent(const struct device * dev,struct kobj_uevent_env * env)1742 static int typec_uevent(const struct device *dev, struct kobj_uevent_env *env)
1743 {
1744 	int ret;
1745 
1746 	ret = add_uevent_var(env, "TYPEC_PORT=%s", dev_name(dev));
1747 	if (ret)
1748 		dev_err(dev, "failed to add uevent TYPEC_PORT\n");
1749 
1750 	return ret;
1751 }
1752 
typec_release(struct device * dev)1753 static void typec_release(struct device *dev)
1754 {
1755 	struct typec_port *port = to_typec_port(dev);
1756 
1757 	ida_simple_remove(&typec_index_ida, port->id);
1758 	ida_destroy(&port->mode_ids);
1759 	typec_switch_put(port->sw);
1760 	typec_mux_put(port->mux);
1761 	typec_retimer_put(port->retimer);
1762 	kfree(port->cap);
1763 	kfree(port);
1764 }
1765 
1766 const struct device_type typec_port_dev_type = {
1767 	.name = "typec_port",
1768 	.groups = typec_groups,
1769 	.uevent = typec_uevent,
1770 	.release = typec_release,
1771 };
1772 
1773 /* --------------------------------------- */
1774 /* Driver callbacks to report role updates */
1775 
partner_match(struct device * dev,void * data)1776 static int partner_match(struct device *dev, void *data)
1777 {
1778 	return is_typec_partner(dev);
1779 }
1780 
1781 /**
1782  * typec_set_data_role - Report data role change
1783  * @port: The USB Type-C Port where the role was changed
1784  * @role: The new data role
1785  *
1786  * This routine is used by the port drivers to report data role changes.
1787  */
typec_set_data_role(struct typec_port * port,enum typec_data_role role)1788 void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
1789 {
1790 	struct device *partner_dev;
1791 
1792 	if (port->data_role == role)
1793 		return;
1794 
1795 	port->data_role = role;
1796 	sysfs_notify(&port->dev.kobj, NULL, "data_role");
1797 	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1798 
1799 	partner_dev = device_find_child(&port->dev, NULL, partner_match);
1800 	if (!partner_dev)
1801 		return;
1802 
1803 	if (to_typec_partner(partner_dev)->identity)
1804 		typec_product_type_notify(partner_dev);
1805 
1806 	put_device(partner_dev);
1807 }
1808 EXPORT_SYMBOL_GPL(typec_set_data_role);
1809 
1810 /**
1811  * typec_set_pwr_role - Report power role change
1812  * @port: The USB Type-C Port where the role was changed
1813  * @role: The new data role
1814  *
1815  * This routine is used by the port drivers to report power role changes.
1816  */
typec_set_pwr_role(struct typec_port * port,enum typec_role role)1817 void typec_set_pwr_role(struct typec_port *port, enum typec_role role)
1818 {
1819 	if (port->pwr_role == role)
1820 		return;
1821 
1822 	port->pwr_role = role;
1823 	sysfs_notify(&port->dev.kobj, NULL, "power_role");
1824 	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1825 }
1826 EXPORT_SYMBOL_GPL(typec_set_pwr_role);
1827 
1828 /**
1829  * typec_set_vconn_role - Report VCONN source change
1830  * @port: The USB Type-C Port which VCONN role changed
1831  * @role: Source when @port is sourcing VCONN, or Sink when it's not
1832  *
1833  * This routine is used by the port drivers to report if the VCONN source is
1834  * changes.
1835  */
typec_set_vconn_role(struct typec_port * port,enum typec_role role)1836 void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
1837 {
1838 	if (port->vconn_role == role)
1839 		return;
1840 
1841 	port->vconn_role = role;
1842 	sysfs_notify(&port->dev.kobj, NULL, "vconn_source");
1843 	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1844 }
1845 EXPORT_SYMBOL_GPL(typec_set_vconn_role);
1846 
1847 /**
1848  * typec_set_pwr_opmode - Report changed power operation mode
1849  * @port: The USB Type-C Port where the mode was changed
1850  * @opmode: New power operation mode
1851  *
1852  * This routine is used by the port drivers to report changed power operation
1853  * mode in @port. The modes are USB (default), 1.5A, 3.0A as defined in USB
1854  * Type-C specification, and "USB Power Delivery" when the power levels are
1855  * negotiated with methods defined in USB Power Delivery specification.
1856  */
typec_set_pwr_opmode(struct typec_port * port,enum typec_pwr_opmode opmode)1857 void typec_set_pwr_opmode(struct typec_port *port,
1858 			  enum typec_pwr_opmode opmode)
1859 {
1860 	struct device *partner_dev;
1861 
1862 	if (port->pwr_opmode == opmode)
1863 		return;
1864 
1865 	port->pwr_opmode = opmode;
1866 	sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
1867 	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1868 
1869 	partner_dev = device_find_child(&port->dev, NULL, partner_match);
1870 	if (partner_dev) {
1871 		struct typec_partner *partner = to_typec_partner(partner_dev);
1872 
1873 		if (opmode == TYPEC_PWR_MODE_PD && !partner->usb_pd) {
1874 			partner->usb_pd = 1;
1875 			sysfs_notify(&partner_dev->kobj, NULL,
1876 				     "supports_usb_power_delivery");
1877 			kobject_uevent(&partner_dev->kobj, KOBJ_CHANGE);
1878 		}
1879 		put_device(partner_dev);
1880 	}
1881 }
1882 EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
1883 
1884 /**
1885  * typec_find_pwr_opmode - Get the typec power operation mode capability
1886  * @name: power operation mode string
1887  *
1888  * This routine is used to find the typec_pwr_opmode by its string @name.
1889  *
1890  * Returns typec_pwr_opmode if success, otherwise negative error code.
1891  */
typec_find_pwr_opmode(const char * name)1892 int typec_find_pwr_opmode(const char *name)
1893 {
1894 	return match_string(typec_pwr_opmodes,
1895 			    ARRAY_SIZE(typec_pwr_opmodes), name);
1896 }
1897 EXPORT_SYMBOL_GPL(typec_find_pwr_opmode);
1898 
1899 /**
1900  * typec_find_orientation - Convert orientation string to enum typec_orientation
1901  * @name: Orientation string
1902  *
1903  * This routine is used to find the typec_orientation by its string name @name.
1904  *
1905  * Returns the orientation value on success, otherwise negative error code.
1906  */
typec_find_orientation(const char * name)1907 int typec_find_orientation(const char *name)
1908 {
1909 	return match_string(typec_orientations, ARRAY_SIZE(typec_orientations),
1910 			    name);
1911 }
1912 EXPORT_SYMBOL_GPL(typec_find_orientation);
1913 
1914 /**
1915  * typec_find_port_power_role - Get the typec port power capability
1916  * @name: port power capability string
1917  *
1918  * This routine is used to find the typec_port_type by its string name.
1919  *
1920  * Returns typec_port_type if success, otherwise negative error code.
1921  */
typec_find_port_power_role(const char * name)1922 int typec_find_port_power_role(const char *name)
1923 {
1924 	return match_string(typec_port_power_roles,
1925 			    ARRAY_SIZE(typec_port_power_roles), name);
1926 }
1927 EXPORT_SYMBOL_GPL(typec_find_port_power_role);
1928 
1929 /**
1930  * typec_find_power_role - Find the typec one specific power role
1931  * @name: power role string
1932  *
1933  * This routine is used to find the typec_role by its string name.
1934  *
1935  * Returns typec_role if success, otherwise negative error code.
1936  */
typec_find_power_role(const char * name)1937 int typec_find_power_role(const char *name)
1938 {
1939 	return match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
1940 }
1941 EXPORT_SYMBOL_GPL(typec_find_power_role);
1942 
1943 /**
1944  * typec_find_port_data_role - Get the typec port data capability
1945  * @name: port data capability string
1946  *
1947  * This routine is used to find the typec_port_data by its string name.
1948  *
1949  * Returns typec_port_data if success, otherwise negative error code.
1950  */
typec_find_port_data_role(const char * name)1951 int typec_find_port_data_role(const char *name)
1952 {
1953 	return match_string(typec_port_data_roles,
1954 			    ARRAY_SIZE(typec_port_data_roles), name);
1955 }
1956 EXPORT_SYMBOL_GPL(typec_find_port_data_role);
1957 
1958 /* ------------------------------------------ */
1959 /* API for Multiplexer/DeMultiplexer Switches */
1960 
1961 /**
1962  * typec_set_orientation - Set USB Type-C cable plug orientation
1963  * @port: USB Type-C Port
1964  * @orientation: USB Type-C cable plug orientation
1965  *
1966  * Set cable plug orientation for @port.
1967  */
typec_set_orientation(struct typec_port * port,enum typec_orientation orientation)1968 int typec_set_orientation(struct typec_port *port,
1969 			  enum typec_orientation orientation)
1970 {
1971 	int ret;
1972 
1973 	ret = typec_switch_set(port->sw, orientation);
1974 	if (ret)
1975 		return ret;
1976 
1977 	port->orientation = orientation;
1978 	sysfs_notify(&port->dev.kobj, NULL, "orientation");
1979 	kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1980 
1981 	return 0;
1982 }
1983 EXPORT_SYMBOL_GPL(typec_set_orientation);
1984 
1985 /**
1986  * typec_get_orientation - Get USB Type-C cable plug orientation
1987  * @port: USB Type-C Port
1988  *
1989  * Get current cable plug orientation for @port.
1990  */
typec_get_orientation(struct typec_port * port)1991 enum typec_orientation typec_get_orientation(struct typec_port *port)
1992 {
1993 	return port->orientation;
1994 }
1995 EXPORT_SYMBOL_GPL(typec_get_orientation);
1996 
1997 /**
1998  * typec_set_mode - Set mode of operation for USB Type-C connector
1999  * @port: USB Type-C connector
2000  * @mode: Accessory Mode, USB Operation or Safe State
2001  *
2002  * Configure @port for Accessory Mode @mode. This function will configure the
2003  * muxes needed for @mode.
2004  */
typec_set_mode(struct typec_port * port,int mode)2005 int typec_set_mode(struct typec_port *port, int mode)
2006 {
2007 	struct typec_mux_state state = { };
2008 
2009 	state.mode = mode;
2010 
2011 	return typec_mux_set(port->mux, &state);
2012 }
2013 EXPORT_SYMBOL_GPL(typec_set_mode);
2014 
2015 /* --------------------------------------- */
2016 
2017 /**
2018  * typec_get_negotiated_svdm_version - Get negotiated SVDM Version
2019  * @port: USB Type-C Port.
2020  *
2021  * Get the negotiated SVDM Version. The Version is set to the port default
2022  * value stored in typec_capability on partner registration, and updated after
2023  * a successful Discover Identity if the negotiated value is less than the
2024  * default value.
2025  *
2026  * Returns usb_pd_svdm_ver if the partner has been registered otherwise -ENODEV.
2027  */
typec_get_negotiated_svdm_version(struct typec_port * port)2028 int typec_get_negotiated_svdm_version(struct typec_port *port)
2029 {
2030 	enum usb_pd_svdm_ver svdm_version;
2031 	struct device *partner_dev;
2032 
2033 	partner_dev = device_find_child(&port->dev, NULL, partner_match);
2034 	if (!partner_dev)
2035 		return -ENODEV;
2036 
2037 	svdm_version = to_typec_partner(partner_dev)->svdm_version;
2038 	put_device(partner_dev);
2039 
2040 	return svdm_version;
2041 }
2042 EXPORT_SYMBOL_GPL(typec_get_negotiated_svdm_version);
2043 
2044 /**
2045  * typec_get_drvdata - Return private driver data pointer
2046  * @port: USB Type-C port
2047  */
typec_get_drvdata(struct typec_port * port)2048 void *typec_get_drvdata(struct typec_port *port)
2049 {
2050 	return dev_get_drvdata(&port->dev);
2051 }
2052 EXPORT_SYMBOL_GPL(typec_get_drvdata);
2053 
typec_get_fw_cap(struct typec_capability * cap,struct fwnode_handle * fwnode)2054 int typec_get_fw_cap(struct typec_capability *cap,
2055 		     struct fwnode_handle *fwnode)
2056 {
2057 	const char *cap_str;
2058 	int ret;
2059 
2060 	cap->fwnode = fwnode;
2061 
2062 	ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
2063 	if (ret < 0)
2064 		return ret;
2065 
2066 	ret = typec_find_port_power_role(cap_str);
2067 	if (ret < 0)
2068 		return ret;
2069 	cap->type = ret;
2070 
2071 	/* USB data support is optional */
2072 	ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
2073 	if (ret == 0) {
2074 		ret = typec_find_port_data_role(cap_str);
2075 		if (ret < 0)
2076 			return ret;
2077 		cap->data = ret;
2078 	}
2079 
2080 	/* Get the preferred power role for a DRP */
2081 	if (cap->type == TYPEC_PORT_DRP) {
2082 		cap->prefer_role = TYPEC_NO_PREFERRED_ROLE;
2083 
2084 		ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
2085 		if (ret == 0) {
2086 			ret = typec_find_power_role(cap_str);
2087 			if (ret < 0)
2088 				return ret;
2089 			cap->prefer_role = ret;
2090 		}
2091 	}
2092 
2093 	return 0;
2094 }
2095 EXPORT_SYMBOL_GPL(typec_get_fw_cap);
2096 
2097 /**
2098  * typec_port_register_altmode - Register USB Type-C Port Alternate Mode
2099  * @port: USB Type-C Port that supports the alternate mode
2100  * @desc: Description of the alternate mode
2101  *
2102  * This routine is used to register an alternate mode that @port is capable of
2103  * supporting.
2104  *
2105  * Returns handle to the alternate mode on success or ERR_PTR on failure.
2106  */
2107 struct typec_altmode *
typec_port_register_altmode(struct typec_port * port,const struct typec_altmode_desc * desc)2108 typec_port_register_altmode(struct typec_port *port,
2109 			    const struct typec_altmode_desc *desc)
2110 {
2111 	struct typec_altmode *adev;
2112 	struct typec_mux *mux;
2113 	struct typec_retimer *retimer;
2114 
2115 	mux = typec_mux_get(&port->dev);
2116 	if (IS_ERR(mux))
2117 		return ERR_CAST(mux);
2118 
2119 	retimer = typec_retimer_get(&port->dev);
2120 	if (IS_ERR(retimer)) {
2121 		typec_mux_put(mux);
2122 		return ERR_CAST(retimer);
2123 	}
2124 
2125 	adev = typec_register_altmode(&port->dev, desc);
2126 	if (IS_ERR(adev)) {
2127 		typec_retimer_put(retimer);
2128 		typec_mux_put(mux);
2129 	} else {
2130 		to_altmode(adev)->mux = mux;
2131 		to_altmode(adev)->retimer = retimer;
2132 	}
2133 
2134 	return adev;
2135 }
2136 EXPORT_SYMBOL_GPL(typec_port_register_altmode);
2137 
typec_port_register_altmodes(struct typec_port * port,const struct typec_altmode_ops * ops,void * drvdata,struct typec_altmode ** altmodes,size_t n)2138 void typec_port_register_altmodes(struct typec_port *port,
2139 	const struct typec_altmode_ops *ops, void *drvdata,
2140 	struct typec_altmode **altmodes, size_t n)
2141 {
2142 	struct fwnode_handle *altmodes_node, *child;
2143 	struct typec_altmode_desc desc;
2144 	struct typec_altmode *alt;
2145 	size_t index = 0;
2146 	u32 svid, vdo;
2147 	int ret;
2148 
2149 	altmodes_node = device_get_named_child_node(&port->dev, "altmodes");
2150 	if (!altmodes_node)
2151 		return; /* No altmodes specified */
2152 
2153 	fwnode_for_each_child_node(altmodes_node, child) {
2154 		ret = fwnode_property_read_u32(child, "svid", &svid);
2155 		if (ret) {
2156 			dev_err(&port->dev, "Error reading svid for altmode %s\n",
2157 				fwnode_get_name(child));
2158 			continue;
2159 		}
2160 
2161 		ret = fwnode_property_read_u32(child, "vdo", &vdo);
2162 		if (ret) {
2163 			dev_err(&port->dev, "Error reading vdo for altmode %s\n",
2164 				fwnode_get_name(child));
2165 			continue;
2166 		}
2167 
2168 		if (index >= n) {
2169 			dev_err(&port->dev, "Error not enough space for altmode %s\n",
2170 				fwnode_get_name(child));
2171 			continue;
2172 		}
2173 
2174 		desc.svid = svid;
2175 		desc.vdo = vdo;
2176 		desc.mode = index + 1;
2177 		alt = typec_port_register_altmode(port, &desc);
2178 		if (IS_ERR(alt)) {
2179 			dev_err(&port->dev, "Error registering altmode %s\n",
2180 				fwnode_get_name(child));
2181 			continue;
2182 		}
2183 
2184 		alt->ops = ops;
2185 		typec_altmode_set_drvdata(alt, drvdata);
2186 		altmodes[index] = alt;
2187 		index++;
2188 	}
2189 }
2190 EXPORT_SYMBOL_GPL(typec_port_register_altmodes);
2191 
2192 /**
2193  * typec_register_port - Register a USB Type-C Port
2194  * @parent: Parent device
2195  * @cap: Description of the port
2196  *
2197  * Registers a device for USB Type-C Port described in @cap.
2198  *
2199  * Returns handle to the port on success or ERR_PTR on failure.
2200  */
typec_register_port(struct device * parent,const struct typec_capability * cap)2201 struct typec_port *typec_register_port(struct device *parent,
2202 				       const struct typec_capability *cap)
2203 {
2204 	struct typec_port *port;
2205 	int ret;
2206 	int id;
2207 
2208 	port = kzalloc(sizeof(*port), GFP_KERNEL);
2209 	if (!port)
2210 		return ERR_PTR(-ENOMEM);
2211 
2212 	id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL);
2213 	if (id < 0) {
2214 		kfree(port);
2215 		return ERR_PTR(id);
2216 	}
2217 
2218 	switch (cap->type) {
2219 	case TYPEC_PORT_SRC:
2220 		port->pwr_role = TYPEC_SOURCE;
2221 		port->vconn_role = TYPEC_SOURCE;
2222 		break;
2223 	case TYPEC_PORT_SNK:
2224 		port->pwr_role = TYPEC_SINK;
2225 		port->vconn_role = TYPEC_SINK;
2226 		break;
2227 	case TYPEC_PORT_DRP:
2228 		if (cap->prefer_role != TYPEC_NO_PREFERRED_ROLE)
2229 			port->pwr_role = cap->prefer_role;
2230 		else
2231 			port->pwr_role = TYPEC_SINK;
2232 		break;
2233 	}
2234 
2235 	switch (cap->data) {
2236 	case TYPEC_PORT_DFP:
2237 		port->data_role = TYPEC_HOST;
2238 		break;
2239 	case TYPEC_PORT_UFP:
2240 		port->data_role = TYPEC_DEVICE;
2241 		break;
2242 	case TYPEC_PORT_DRD:
2243 		if (cap->prefer_role == TYPEC_SOURCE)
2244 			port->data_role = TYPEC_HOST;
2245 		else
2246 			port->data_role = TYPEC_DEVICE;
2247 		break;
2248 	}
2249 
2250 	ida_init(&port->mode_ids);
2251 	mutex_init(&port->port_type_lock);
2252 
2253 	port->id = id;
2254 	port->ops = cap->ops;
2255 	port->port_type = cap->type;
2256 	port->prefer_role = cap->prefer_role;
2257 
2258 	device_initialize(&port->dev);
2259 	port->dev.class = &typec_class;
2260 	port->dev.parent = parent;
2261 	port->dev.fwnode = cap->fwnode;
2262 	port->dev.type = &typec_port_dev_type;
2263 	dev_set_name(&port->dev, "port%d", id);
2264 	dev_set_drvdata(&port->dev, cap->driver_data);
2265 
2266 	port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL);
2267 	if (!port->cap) {
2268 		put_device(&port->dev);
2269 		return ERR_PTR(-ENOMEM);
2270 	}
2271 
2272 	port->sw = typec_switch_get(&port->dev);
2273 	if (IS_ERR(port->sw)) {
2274 		ret = PTR_ERR(port->sw);
2275 		put_device(&port->dev);
2276 		return ERR_PTR(ret);
2277 	}
2278 
2279 	port->mux = typec_mux_get(&port->dev);
2280 	if (IS_ERR(port->mux)) {
2281 		ret = PTR_ERR(port->mux);
2282 		put_device(&port->dev);
2283 		return ERR_PTR(ret);
2284 	}
2285 
2286 	port->retimer = typec_retimer_get(&port->dev);
2287 	if (IS_ERR(port->retimer)) {
2288 		ret = PTR_ERR(port->retimer);
2289 		put_device(&port->dev);
2290 		return ERR_PTR(ret);
2291 	}
2292 
2293 	port->pd = cap->pd;
2294 
2295 	ret = device_add(&port->dev);
2296 	if (ret) {
2297 		dev_err(parent, "failed to register port (%d)\n", ret);
2298 		put_device(&port->dev);
2299 		return ERR_PTR(ret);
2300 	}
2301 
2302 	ret = usb_power_delivery_link_device(port->pd, &port->dev);
2303 	if (ret) {
2304 		dev_err(&port->dev, "failed to link pd\n");
2305 		device_unregister(&port->dev);
2306 		return ERR_PTR(ret);
2307 	}
2308 
2309 	ret = typec_link_ports(port);
2310 	if (ret)
2311 		dev_warn(&port->dev, "failed to create symlinks (%d)\n", ret);
2312 
2313 	return port;
2314 }
2315 EXPORT_SYMBOL_GPL(typec_register_port);
2316 
2317 /**
2318  * typec_unregister_port - Unregister a USB Type-C Port
2319  * @port: The port to be unregistered
2320  *
2321  * Unregister device created with typec_register_port().
2322  */
typec_unregister_port(struct typec_port * port)2323 void typec_unregister_port(struct typec_port *port)
2324 {
2325 	if (!IS_ERR_OR_NULL(port)) {
2326 		typec_unlink_ports(port);
2327 		typec_port_set_usb_power_delivery(port, NULL);
2328 		device_unregister(&port->dev);
2329 	}
2330 }
2331 EXPORT_SYMBOL_GPL(typec_unregister_port);
2332 
typec_init(void)2333 static int __init typec_init(void)
2334 {
2335 	int ret;
2336 
2337 	ret = bus_register(&typec_bus);
2338 	if (ret)
2339 		return ret;
2340 
2341 	ret = class_register(&typec_mux_class);
2342 	if (ret)
2343 		goto err_unregister_bus;
2344 
2345 	ret = class_register(&retimer_class);
2346 	if (ret)
2347 		goto err_unregister_mux_class;
2348 
2349 	ret = class_register(&typec_class);
2350 	if (ret)
2351 		goto err_unregister_retimer_class;
2352 
2353 	ret = usb_power_delivery_init();
2354 	if (ret)
2355 		goto err_unregister_class;
2356 
2357 	return 0;
2358 
2359 err_unregister_class:
2360 	class_unregister(&typec_class);
2361 
2362 err_unregister_retimer_class:
2363 	class_unregister(&retimer_class);
2364 
2365 err_unregister_mux_class:
2366 	class_unregister(&typec_mux_class);
2367 
2368 err_unregister_bus:
2369 	bus_unregister(&typec_bus);
2370 
2371 	return ret;
2372 }
2373 subsys_initcall(typec_init);
2374 
typec_exit(void)2375 static void __exit typec_exit(void)
2376 {
2377 	usb_power_delivery_exit();
2378 	class_unregister(&typec_class);
2379 	ida_destroy(&typec_index_ida);
2380 	bus_unregister(&typec_bus);
2381 	class_unregister(&typec_mux_class);
2382 	class_unregister(&retimer_class);
2383 }
2384 module_exit(typec_exit);
2385 
2386 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
2387 MODULE_LICENSE("GPL v2");
2388 MODULE_DESCRIPTION("USB Type-C Connector Class");
2389