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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/device.h>
10#include <linux/module.h>
11#include <linux/mutex.h>
12#include <linux/property.h>
13#include <linux/slab.h>
14
15#include "bus.h"
16
17struct typec_plug {
18 struct device dev;
19 enum typec_plug_index index;
20 struct ida mode_ids;
21};
22
23struct typec_cable {
24 struct device dev;
25 enum typec_plug_type type;
26 struct usb_pd_identity *identity;
27 unsigned int active:1;
28};
29
30struct typec_partner {
31 struct device dev;
32 unsigned int usb_pd:1;
33 struct usb_pd_identity *identity;
34 enum typec_accessory accessory;
35 struct ida mode_ids;
36};
37
38struct typec_port {
39 unsigned int id;
40 struct device dev;
41 struct ida mode_ids;
42
43 int prefer_role;
44 enum typec_data_role data_role;
45 enum typec_role pwr_role;
46 enum typec_role vconn_role;
47 enum typec_pwr_opmode pwr_opmode;
48 enum typec_port_type port_type;
49 struct mutex port_type_lock;
50
51 enum typec_orientation orientation;
52 struct typec_switch *sw;
53 struct typec_mux *mux;
54
55 const struct typec_capability *cap;
56};
57
58#define to_typec_port(_dev_) container_of(_dev_, struct typec_port, dev)
59#define to_typec_plug(_dev_) container_of(_dev_, struct typec_plug, dev)
60#define to_typec_cable(_dev_) container_of(_dev_, struct typec_cable, dev)
61#define to_typec_partner(_dev_) container_of(_dev_, struct typec_partner, dev)
62
63static const struct device_type typec_partner_dev_type;
64static const struct device_type typec_cable_dev_type;
65static const struct device_type typec_plug_dev_type;
66
67#define is_typec_partner(_dev_) (_dev_->type == &typec_partner_dev_type)
68#define is_typec_cable(_dev_) (_dev_->type == &typec_cable_dev_type)
69#define is_typec_plug(_dev_) (_dev_->type == &typec_plug_dev_type)
70
71static DEFINE_IDA(typec_index_ida);
72static struct class *typec_class;
73
74/* ------------------------------------------------------------------------- */
75/* Common attributes */
76
77static const char * const typec_accessory_modes[] = {
78 [TYPEC_ACCESSORY_NONE] = "none",
79 [TYPEC_ACCESSORY_AUDIO] = "analog_audio",
80 [TYPEC_ACCESSORY_DEBUG] = "debug",
81};
82
83static struct usb_pd_identity *get_pd_identity(struct device *dev)
84{
85 if (is_typec_partner(dev)) {
86 struct typec_partner *partner = to_typec_partner(dev);
87
88 return partner->identity;
89 } else if (is_typec_cable(dev)) {
90 struct typec_cable *cable = to_typec_cable(dev);
91
92 return cable->identity;
93 }
94 return NULL;
95}
96
97static ssize_t id_header_show(struct device *dev, struct device_attribute *attr,
98 char *buf)
99{
100 struct usb_pd_identity *id = get_pd_identity(dev);
101
102 return sprintf(buf, "0x%08x\n", id->id_header);
103}
104static DEVICE_ATTR_RO(id_header);
105
106static ssize_t cert_stat_show(struct device *dev, struct device_attribute *attr,
107 char *buf)
108{
109 struct usb_pd_identity *id = get_pd_identity(dev);
110
111 return sprintf(buf, "0x%08x\n", id->cert_stat);
112}
113static DEVICE_ATTR_RO(cert_stat);
114
115static ssize_t product_show(struct device *dev, struct device_attribute *attr,
116 char *buf)
117{
118 struct usb_pd_identity *id = get_pd_identity(dev);
119
120 return sprintf(buf, "0x%08x\n", id->product);
121}
122static DEVICE_ATTR_RO(product);
123
124static struct attribute *usb_pd_id_attrs[] = {
125 &dev_attr_id_header.attr,
126 &dev_attr_cert_stat.attr,
127 &dev_attr_product.attr,
128 NULL
129};
130
131static const struct attribute_group usb_pd_id_group = {
132 .name = "identity",
133 .attrs = usb_pd_id_attrs,
134};
135
136static const struct attribute_group *usb_pd_id_groups[] = {
137 &usb_pd_id_group,
138 NULL,
139};
140
141static void typec_report_identity(struct device *dev)
142{
143 sysfs_notify(&dev->kobj, "identity", "id_header");
144 sysfs_notify(&dev->kobj, "identity", "cert_stat");
145 sysfs_notify(&dev->kobj, "identity", "product");
146}
147
148/* ------------------------------------------------------------------------- */
149/* Alternate Modes */
150
151static int altmode_match(struct device *dev, void *data)
152{
153 struct typec_altmode *adev = to_typec_altmode(dev);
154 struct typec_device_id *id = data;
155
156 if (!is_typec_altmode(dev))
157 return 0;
158
159 return ((adev->svid == id->svid) && (adev->mode == id->mode));
160}
161
162static void typec_altmode_set_partner(struct altmode *altmode)
163{
164 struct typec_altmode *adev = &altmode->adev;
165 struct typec_device_id id = { adev->svid, adev->mode, };
166 struct typec_port *port = typec_altmode2port(adev);
167 struct altmode *partner;
168 struct device *dev;
169
170 dev = device_find_child(&port->dev, &id, altmode_match);
171 if (!dev)
172 return;
173
174 /* Bind the port alt mode to the partner/plug alt mode. */
175 partner = to_altmode(to_typec_altmode(dev));
176 altmode->partner = partner;
177
178 /* Bind the partner/plug alt mode to the port alt mode. */
179 if (is_typec_plug(adev->dev.parent)) {
180 struct typec_plug *plug = to_typec_plug(adev->dev.parent);
181
182 partner->plug[plug->index] = altmode;
183 } else {
184 partner->partner = altmode;
185 }
186}
187
188static void typec_altmode_put_partner(struct altmode *altmode)
189{
190 struct altmode *partner = altmode->partner;
191 struct typec_altmode *adev;
192
193 if (!partner)
194 return;
195
196 adev = &partner->adev;
197
198 if (is_typec_plug(adev->dev.parent)) {
199 struct typec_plug *plug = to_typec_plug(adev->dev.parent);
200
201 partner->plug[plug->index] = NULL;
202 } else {
203 partner->partner = NULL;
204 }
205 put_device(&adev->dev);
206}
207
208static void *typec_port_match(struct device_connection *con, int ep, void *data)
209{
210 struct device *dev;
211
212 /*
213 * FIXME: Check does the fwnode supports the requested SVID. If it does
214 * we need to return ERR_PTR(-PROBE_DEFER) when there is no device.
215 */
216 if (con->fwnode)
217 return class_find_device_by_fwnode(typec_class, con->fwnode);
218
219 dev = class_find_device_by_name(typec_class, con->endpoint[ep]);
220
221 return dev ? dev : ERR_PTR(-EPROBE_DEFER);
222}
223
224struct typec_altmode *
225typec_altmode_register_notifier(struct device *dev, u16 svid, u8 mode,
226 struct notifier_block *nb)
227{
228 struct typec_device_id id = { svid, mode, };
229 struct device *altmode_dev;
230 struct device *port_dev;
231 struct altmode *altmode;
232 int ret;
233
234 /* Find the port linked to the caller */
235 port_dev = device_connection_find_match(dev, NULL, NULL,
236 typec_port_match);
237 if (IS_ERR_OR_NULL(port_dev))
238 return port_dev ? ERR_CAST(port_dev) : ERR_PTR(-ENODEV);
239
240 /* Find the altmode with matching svid */
241 altmode_dev = device_find_child(port_dev, &id, altmode_match);
242
243 put_device(port_dev);
244
245 if (!altmode_dev)
246 return ERR_PTR(-ENODEV);
247
248 altmode = to_altmode(to_typec_altmode(altmode_dev));
249
250 /* Register notifier */
251 ret = blocking_notifier_chain_register(&altmode->nh, nb);
252 if (ret) {
253 put_device(altmode_dev);
254 return ERR_PTR(ret);
255 }
256
257 return &altmode->adev;
258}
259EXPORT_SYMBOL_GPL(typec_altmode_register_notifier);
260
261void typec_altmode_unregister_notifier(struct typec_altmode *adev,
262 struct notifier_block *nb)
263{
264 struct altmode *altmode = to_altmode(adev);
265
266 blocking_notifier_chain_unregister(&altmode->nh, nb);
267 put_device(&adev->dev);
268}
269EXPORT_SYMBOL_GPL(typec_altmode_unregister_notifier);
270
271/**
272 * typec_altmode_update_active - Report Enter/Exit mode
273 * @adev: Handle to the alternate mode
274 * @active: True when the mode has been entered
275 *
276 * If a partner or cable plug executes Enter/Exit Mode command successfully, the
277 * drivers use this routine to report the updated state of the mode.
278 */
279void typec_altmode_update_active(struct typec_altmode *adev, bool active)
280{
281 char dir[6];
282
283 if (adev->active == active)
284 return;
285
286 if (!is_typec_port(adev->dev.parent) && adev->dev.driver) {
287 if (!active)
288 module_put(adev->dev.driver->owner);
289 else
290 WARN_ON(!try_module_get(adev->dev.driver->owner));
291 }
292
293 adev->active = active;
294 snprintf(dir, sizeof(dir), "mode%d", adev->mode);
295 sysfs_notify(&adev->dev.kobj, dir, "active");
296 sysfs_notify(&adev->dev.kobj, NULL, "active");
297 kobject_uevent(&adev->dev.kobj, KOBJ_CHANGE);
298}
299EXPORT_SYMBOL_GPL(typec_altmode_update_active);
300
301/**
302 * typec_altmode2port - Alternate Mode to USB Type-C port
303 * @alt: The Alternate Mode
304 *
305 * Returns handle to the port that a cable plug or partner with @alt is
306 * connected to.
307 */
308struct typec_port *typec_altmode2port(struct typec_altmode *alt)
309{
310 if (is_typec_plug(alt->dev.parent))
311 return to_typec_port(alt->dev.parent->parent->parent);
312 if (is_typec_partner(alt->dev.parent))
313 return to_typec_port(alt->dev.parent->parent);
314 if (is_typec_port(alt->dev.parent))
315 return to_typec_port(alt->dev.parent);
316
317 return NULL;
318}
319EXPORT_SYMBOL_GPL(typec_altmode2port);
320
321static ssize_t
322vdo_show(struct device *dev, struct device_attribute *attr, char *buf)
323{
324 struct typec_altmode *alt = to_typec_altmode(dev);
325
326 return sprintf(buf, "0x%08x\n", alt->vdo);
327}
328static DEVICE_ATTR_RO(vdo);
329
330static ssize_t
331description_show(struct device *dev, struct device_attribute *attr, char *buf)
332{
333 struct typec_altmode *alt = to_typec_altmode(dev);
334
335 return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
336}
337static DEVICE_ATTR_RO(description);
338
339static ssize_t
340active_show(struct device *dev, struct device_attribute *attr, char *buf)
341{
342 struct typec_altmode *alt = to_typec_altmode(dev);
343
344 return sprintf(buf, "%s\n", alt->active ? "yes" : "no");
345}
346
347static ssize_t active_store(struct device *dev, struct device_attribute *attr,
348 const char *buf, size_t size)
349{
350 struct typec_altmode *adev = to_typec_altmode(dev);
351 struct altmode *altmode = to_altmode(adev);
352 bool enter;
353 int ret;
354
355 ret = kstrtobool(buf, &enter);
356 if (ret)
357 return ret;
358
359 if (adev->active == enter)
360 return size;
361
362 if (is_typec_port(adev->dev.parent)) {
363 typec_altmode_update_active(adev, enter);
364
365 /* Make sure that the partner exits the mode before disabling */
366 if (altmode->partner && !enter && altmode->partner->adev.active)
367 typec_altmode_exit(&altmode->partner->adev);
368 } else if (altmode->partner) {
369 if (enter && !altmode->partner->adev.active) {
370 dev_warn(dev, "port has the mode disabled\n");
371 return -EPERM;
372 }
373 }
374
375 /* Note: If there is no driver, the mode will not be entered */
376 if (adev->ops && adev->ops->activate) {
377 ret = adev->ops->activate(adev, enter);
378 if (ret)
379 return ret;
380 }
381
382 return size;
383}
384static DEVICE_ATTR_RW(active);
385
386static ssize_t
387supported_roles_show(struct device *dev, struct device_attribute *attr,
388 char *buf)
389{
390 struct altmode *alt = to_altmode(to_typec_altmode(dev));
391 ssize_t ret;
392
393 switch (alt->roles) {
394 case TYPEC_PORT_SRC:
395 ret = sprintf(buf, "source\n");
396 break;
397 case TYPEC_PORT_SNK:
398 ret = sprintf(buf, "sink\n");
399 break;
400 case TYPEC_PORT_DRP:
401 default:
402 ret = sprintf(buf, "source sink\n");
403 break;
404 }
405 return ret;
406}
407static DEVICE_ATTR_RO(supported_roles);
408
409static ssize_t
410mode_show(struct device *dev, struct device_attribute *attr, char *buf)
411{
412 struct typec_altmode *adev = to_typec_altmode(dev);
413
414 return sprintf(buf, "%u\n", adev->mode);
415}
416static DEVICE_ATTR_RO(mode);
417
418static ssize_t
419svid_show(struct device *dev, struct device_attribute *attr, char *buf)
420{
421 struct typec_altmode *adev = to_typec_altmode(dev);
422
423 return sprintf(buf, "%04x\n", adev->svid);
424}
425static DEVICE_ATTR_RO(svid);
426
427static struct attribute *typec_altmode_attrs[] = {
428 &dev_attr_active.attr,
429 &dev_attr_mode.attr,
430 &dev_attr_svid.attr,
431 &dev_attr_vdo.attr,
432 NULL
433};
434ATTRIBUTE_GROUPS(typec_altmode);
435
436static int altmode_id_get(struct device *dev)
437{
438 struct ida *ids;
439
440 if (is_typec_partner(dev))
441 ids = &to_typec_partner(dev)->mode_ids;
442 else if (is_typec_plug(dev))
443 ids = &to_typec_plug(dev)->mode_ids;
444 else
445 ids = &to_typec_port(dev)->mode_ids;
446
447 return ida_simple_get(ids, 0, 0, GFP_KERNEL);
448}
449
450static void altmode_id_remove(struct device *dev, int id)
451{
452 struct ida *ids;
453
454 if (is_typec_partner(dev))
455 ids = &to_typec_partner(dev)->mode_ids;
456 else if (is_typec_plug(dev))
457 ids = &to_typec_plug(dev)->mode_ids;
458 else
459 ids = &to_typec_port(dev)->mode_ids;
460
461 ida_simple_remove(ids, id);
462}
463
464static void typec_altmode_release(struct device *dev)
465{
466 struct altmode *alt = to_altmode(to_typec_altmode(dev));
467
468 typec_altmode_put_partner(alt);
469
470 altmode_id_remove(alt->adev.dev.parent, alt->id);
471 kfree(alt);
472}
473
474const struct device_type typec_altmode_dev_type = {
475 .name = "typec_alternate_mode",
476 .groups = typec_altmode_groups,
477 .release = typec_altmode_release,
478};
479
480static struct typec_altmode *
481typec_register_altmode(struct device *parent,
482 const struct typec_altmode_desc *desc)
483{
484 unsigned int id = altmode_id_get(parent);
485 bool is_port = is_typec_port(parent);
486 struct altmode *alt;
487 int ret;
488
489 alt = kzalloc(sizeof(*alt), GFP_KERNEL);
490 if (!alt)
491 return ERR_PTR(-ENOMEM);
492
493 alt->adev.svid = desc->svid;
494 alt->adev.mode = desc->mode;
495 alt->adev.vdo = desc->vdo;
496 alt->roles = desc->roles;
497 alt->id = id;
498
499 alt->attrs[0] = &dev_attr_vdo.attr;
500 alt->attrs[1] = &dev_attr_description.attr;
501 alt->attrs[2] = &dev_attr_active.attr;
502
503 if (is_port) {
504 alt->attrs[3] = &dev_attr_supported_roles.attr;
505 alt->adev.active = true; /* Enabled by default */
506 }
507
508 sprintf(alt->group_name, "mode%d", desc->mode);
509 alt->group.name = alt->group_name;
510 alt->group.attrs = alt->attrs;
511 alt->groups[0] = &alt->group;
512
513 alt->adev.dev.parent = parent;
514 alt->adev.dev.groups = alt->groups;
515 alt->adev.dev.type = &typec_altmode_dev_type;
516 dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id);
517
518 /* Link partners and plugs with the ports */
519 if (is_port)
520 BLOCKING_INIT_NOTIFIER_HEAD(&alt->nh);
521 else
522 typec_altmode_set_partner(alt);
523
524 /* The partners are bind to drivers */
525 if (is_typec_partner(parent))
526 alt->adev.dev.bus = &typec_bus;
527
528 ret = device_register(&alt->adev.dev);
529 if (ret) {
530 dev_err(parent, "failed to register alternate mode (%d)\n",
531 ret);
532 put_device(&alt->adev.dev);
533 return ERR_PTR(ret);
534 }
535
536 return &alt->adev;
537}
538
539/**
540 * typec_unregister_altmode - Unregister Alternate Mode
541 * @adev: The alternate mode to be unregistered
542 *
543 * Unregister device created with typec_partner_register_altmode(),
544 * typec_plug_register_altmode() or typec_port_register_altmode().
545 */
546void typec_unregister_altmode(struct typec_altmode *adev)
547{
548 if (IS_ERR_OR_NULL(adev))
549 return;
550 typec_mux_put(to_altmode(adev)->mux);
551 device_unregister(&adev->dev);
552}
553EXPORT_SYMBOL_GPL(typec_unregister_altmode);
554
555/* ------------------------------------------------------------------------- */
556/* Type-C Partners */
557
558static ssize_t accessory_mode_show(struct device *dev,
559 struct device_attribute *attr,
560 char *buf)
561{
562 struct typec_partner *p = to_typec_partner(dev);
563
564 return sprintf(buf, "%s\n", typec_accessory_modes[p->accessory]);
565}
566static DEVICE_ATTR_RO(accessory_mode);
567
568static ssize_t supports_usb_power_delivery_show(struct device *dev,
569 struct device_attribute *attr,
570 char *buf)
571{
572 struct typec_partner *p = to_typec_partner(dev);
573
574 return sprintf(buf, "%s\n", p->usb_pd ? "yes" : "no");
575}
576static DEVICE_ATTR_RO(supports_usb_power_delivery);
577
578static struct attribute *typec_partner_attrs[] = {
579 &dev_attr_accessory_mode.attr,
580 &dev_attr_supports_usb_power_delivery.attr,
581 NULL
582};
583ATTRIBUTE_GROUPS(typec_partner);
584
585static void typec_partner_release(struct device *dev)
586{
587 struct typec_partner *partner = to_typec_partner(dev);
588
589 ida_destroy(&partner->mode_ids);
590 kfree(partner);
591}
592
593static const struct device_type typec_partner_dev_type = {
594 .name = "typec_partner",
595 .groups = typec_partner_groups,
596 .release = typec_partner_release,
597};
598
599/**
600 * typec_partner_set_identity - Report result from Discover Identity command
601 * @partner: The partner updated identity values
602 *
603 * This routine is used to report that the result of Discover Identity USB power
604 * delivery command has become available.
605 */
606int typec_partner_set_identity(struct typec_partner *partner)
607{
608 if (!partner->identity)
609 return -EINVAL;
610
611 typec_report_identity(&partner->dev);
612 return 0;
613}
614EXPORT_SYMBOL_GPL(typec_partner_set_identity);
615
616/**
617 * typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode
618 * @partner: USB Type-C Partner that supports the alternate mode
619 * @desc: Description of the alternate mode
620 *
621 * This routine is used to register each alternate mode individually that
622 * @partner has listed in response to Discover SVIDs command. The modes for a
623 * SVID listed in response to Discover Modes command need to be listed in an
624 * array in @desc.
625 *
626 * Returns handle to the alternate mode on success or NULL on failure.
627 */
628struct typec_altmode *
629typec_partner_register_altmode(struct typec_partner *partner,
630 const struct typec_altmode_desc *desc)
631{
632 return typec_register_altmode(&partner->dev, desc);
633}
634EXPORT_SYMBOL_GPL(typec_partner_register_altmode);
635
636/**
637 * typec_register_partner - Register a USB Type-C Partner
638 * @port: The USB Type-C Port the partner is connected to
639 * @desc: Description of the partner
640 *
641 * Registers a device for USB Type-C Partner described in @desc.
642 *
643 * Returns handle to the partner on success or ERR_PTR on failure.
644 */
645struct typec_partner *typec_register_partner(struct typec_port *port,
646 struct typec_partner_desc *desc)
647{
648 struct typec_partner *partner;
649 int ret;
650
651 partner = kzalloc(sizeof(*partner), GFP_KERNEL);
652 if (!partner)
653 return ERR_PTR(-ENOMEM);
654
655 ida_init(&partner->mode_ids);
656 partner->usb_pd = desc->usb_pd;
657 partner->accessory = desc->accessory;
658
659 if (desc->identity) {
660 /*
661 * Creating directory for the identity only if the driver is
662 * able to provide data to it.
663 */
664 partner->dev.groups = usb_pd_id_groups;
665 partner->identity = desc->identity;
666 }
667
668 partner->dev.class = typec_class;
669 partner->dev.parent = &port->dev;
670 partner->dev.type = &typec_partner_dev_type;
671 dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev));
672
673 ret = device_register(&partner->dev);
674 if (ret) {
675 dev_err(&port->dev, "failed to register partner (%d)\n", ret);
676 put_device(&partner->dev);
677 return ERR_PTR(ret);
678 }
679
680 return partner;
681}
682EXPORT_SYMBOL_GPL(typec_register_partner);
683
684/**
685 * typec_unregister_partner - Unregister a USB Type-C Partner
686 * @partner: The partner to be unregistered
687 *
688 * Unregister device created with typec_register_partner().
689 */
690void typec_unregister_partner(struct typec_partner *partner)
691{
692 if (!IS_ERR_OR_NULL(partner))
693 device_unregister(&partner->dev);
694}
695EXPORT_SYMBOL_GPL(typec_unregister_partner);
696
697/* ------------------------------------------------------------------------- */
698/* Type-C Cable Plugs */
699
700static void typec_plug_release(struct device *dev)
701{
702 struct typec_plug *plug = to_typec_plug(dev);
703
704 ida_destroy(&plug->mode_ids);
705 kfree(plug);
706}
707
708static const struct device_type typec_plug_dev_type = {
709 .name = "typec_plug",
710 .release = typec_plug_release,
711};
712
713/**
714 * typec_plug_register_altmode - Register USB Type-C Cable Plug Alternate Mode
715 * @plug: USB Type-C Cable Plug that supports the alternate mode
716 * @desc: Description of the alternate mode
717 *
718 * This routine is used to register each alternate mode individually that @plug
719 * has listed in response to Discover SVIDs command. The modes for a SVID that
720 * the plug lists in response to Discover Modes command need to be listed in an
721 * array in @desc.
722 *
723 * Returns handle to the alternate mode on success or ERR_PTR on failure.
724 */
725struct typec_altmode *
726typec_plug_register_altmode(struct typec_plug *plug,
727 const struct typec_altmode_desc *desc)
728{
729 return typec_register_altmode(&plug->dev, desc);
730}
731EXPORT_SYMBOL_GPL(typec_plug_register_altmode);
732
733/**
734 * typec_register_plug - Register a USB Type-C Cable Plug
735 * @cable: USB Type-C Cable with the plug
736 * @desc: Description of the cable plug
737 *
738 * Registers a device for USB Type-C Cable Plug described in @desc. A USB Type-C
739 * Cable Plug represents a plug with electronics in it that can response to USB
740 * Power Delivery SOP Prime or SOP Double Prime packages.
741 *
742 * Returns handle to the cable plug on success or ERR_PTR on failure.
743 */
744struct typec_plug *typec_register_plug(struct typec_cable *cable,
745 struct typec_plug_desc *desc)
746{
747 struct typec_plug *plug;
748 char name[8];
749 int ret;
750
751 plug = kzalloc(sizeof(*plug), GFP_KERNEL);
752 if (!plug)
753 return ERR_PTR(-ENOMEM);
754
755 sprintf(name, "plug%d", desc->index);
756
757 ida_init(&plug->mode_ids);
758 plug->index = desc->index;
759 plug->dev.class = typec_class;
760 plug->dev.parent = &cable->dev;
761 plug->dev.type = &typec_plug_dev_type;
762 dev_set_name(&plug->dev, "%s-%s", dev_name(cable->dev.parent), name);
763
764 ret = device_register(&plug->dev);
765 if (ret) {
766 dev_err(&cable->dev, "failed to register plug (%d)\n", ret);
767 put_device(&plug->dev);
768 return ERR_PTR(ret);
769 }
770
771 return plug;
772}
773EXPORT_SYMBOL_GPL(typec_register_plug);
774
775/**
776 * typec_unregister_plug - Unregister a USB Type-C Cable Plug
777 * @plug: The cable plug to be unregistered
778 *
779 * Unregister device created with typec_register_plug().
780 */
781void typec_unregister_plug(struct typec_plug *plug)
782{
783 if (!IS_ERR_OR_NULL(plug))
784 device_unregister(&plug->dev);
785}
786EXPORT_SYMBOL_GPL(typec_unregister_plug);
787
788/* Type-C Cables */
789
790static ssize_t
791type_show(struct device *dev, struct device_attribute *attr, char *buf)
792{
793 struct typec_cable *cable = to_typec_cable(dev);
794
795 return sprintf(buf, "%s\n", cable->active ? "active" : "passive");
796}
797static DEVICE_ATTR_RO(type);
798
799static const char * const typec_plug_types[] = {
800 [USB_PLUG_NONE] = "unknown",
801 [USB_PLUG_TYPE_A] = "type-a",
802 [USB_PLUG_TYPE_B] = "type-b",
803 [USB_PLUG_TYPE_C] = "type-c",
804 [USB_PLUG_CAPTIVE] = "captive",
805};
806
807static ssize_t plug_type_show(struct device *dev,
808 struct device_attribute *attr, char *buf)
809{
810 struct typec_cable *cable = to_typec_cable(dev);
811
812 return sprintf(buf, "%s\n", typec_plug_types[cable->type]);
813}
814static DEVICE_ATTR_RO(plug_type);
815
816static struct attribute *typec_cable_attrs[] = {
817 &dev_attr_type.attr,
818 &dev_attr_plug_type.attr,
819 NULL
820};
821ATTRIBUTE_GROUPS(typec_cable);
822
823static void typec_cable_release(struct device *dev)
824{
825 struct typec_cable *cable = to_typec_cable(dev);
826
827 kfree(cable);
828}
829
830static const struct device_type typec_cable_dev_type = {
831 .name = "typec_cable",
832 .groups = typec_cable_groups,
833 .release = typec_cable_release,
834};
835
836/**
837 * typec_cable_set_identity - Report result from Discover Identity command
838 * @cable: The cable updated identity values
839 *
840 * This routine is used to report that the result of Discover Identity USB power
841 * delivery command has become available.
842 */
843int typec_cable_set_identity(struct typec_cable *cable)
844{
845 if (!cable->identity)
846 return -EINVAL;
847
848 typec_report_identity(&cable->dev);
849 return 0;
850}
851EXPORT_SYMBOL_GPL(typec_cable_set_identity);
852
853/**
854 * typec_register_cable - Register a USB Type-C Cable
855 * @port: The USB Type-C Port the cable is connected to
856 * @desc: Description of the cable
857 *
858 * Registers a device for USB Type-C Cable described in @desc. The cable will be
859 * parent for the optional cable plug devises.
860 *
861 * Returns handle to the cable on success or ERR_PTR on failure.
862 */
863struct typec_cable *typec_register_cable(struct typec_port *port,
864 struct typec_cable_desc *desc)
865{
866 struct typec_cable *cable;
867 int ret;
868
869 cable = kzalloc(sizeof(*cable), GFP_KERNEL);
870 if (!cable)
871 return ERR_PTR(-ENOMEM);
872
873 cable->type = desc->type;
874 cable->active = desc->active;
875
876 if (desc->identity) {
877 /*
878 * Creating directory for the identity only if the driver is
879 * able to provide data to it.
880 */
881 cable->dev.groups = usb_pd_id_groups;
882 cable->identity = desc->identity;
883 }
884
885 cable->dev.class = typec_class;
886 cable->dev.parent = &port->dev;
887 cable->dev.type = &typec_cable_dev_type;
888 dev_set_name(&cable->dev, "%s-cable", dev_name(&port->dev));
889
890 ret = device_register(&cable->dev);
891 if (ret) {
892 dev_err(&port->dev, "failed to register cable (%d)\n", ret);
893 put_device(&cable->dev);
894 return ERR_PTR(ret);
895 }
896
897 return cable;
898}
899EXPORT_SYMBOL_GPL(typec_register_cable);
900
901/**
902 * typec_unregister_cable - Unregister a USB Type-C Cable
903 * @cable: The cable to be unregistered
904 *
905 * Unregister device created with typec_register_cable().
906 */
907void typec_unregister_cable(struct typec_cable *cable)
908{
909 if (!IS_ERR_OR_NULL(cable))
910 device_unregister(&cable->dev);
911}
912EXPORT_SYMBOL_GPL(typec_unregister_cable);
913
914/* ------------------------------------------------------------------------- */
915/* USB Type-C ports */
916
917static const char * const typec_roles[] = {
918 [TYPEC_SINK] = "sink",
919 [TYPEC_SOURCE] = "source",
920};
921
922static const char * const typec_data_roles[] = {
923 [TYPEC_DEVICE] = "device",
924 [TYPEC_HOST] = "host",
925};
926
927static const char * const typec_port_power_roles[] = {
928 [TYPEC_PORT_SRC] = "source",
929 [TYPEC_PORT_SNK] = "sink",
930 [TYPEC_PORT_DRP] = "dual",
931};
932
933static const char * const typec_port_data_roles[] = {
934 [TYPEC_PORT_DFP] = "host",
935 [TYPEC_PORT_UFP] = "device",
936 [TYPEC_PORT_DRD] = "dual",
937};
938
939static const char * const typec_port_types_drp[] = {
940 [TYPEC_PORT_SRC] = "dual [source] sink",
941 [TYPEC_PORT_SNK] = "dual source [sink]",
942 [TYPEC_PORT_DRP] = "[dual] source sink",
943};
944
945static ssize_t
946preferred_role_store(struct device *dev, struct device_attribute *attr,
947 const char *buf, size_t size)
948{
949 struct typec_port *port = to_typec_port(dev);
950 int role;
951 int ret;
952
953 if (port->cap->type != TYPEC_PORT_DRP) {
954 dev_dbg(dev, "Preferred role only supported with DRP ports\n");
955 return -EOPNOTSUPP;
956 }
957
958 if (!port->cap->try_role) {
959 dev_dbg(dev, "Setting preferred role not supported\n");
960 return -EOPNOTSUPP;
961 }
962
963 role = sysfs_match_string(typec_roles, buf);
964 if (role < 0) {
965 if (sysfs_streq(buf, "none"))
966 role = TYPEC_NO_PREFERRED_ROLE;
967 else
968 return -EINVAL;
969 }
970
971 ret = port->cap->try_role(port->cap, role);
972 if (ret)
973 return ret;
974
975 port->prefer_role = role;
976 return size;
977}
978
979static ssize_t
980preferred_role_show(struct device *dev, struct device_attribute *attr,
981 char *buf)
982{
983 struct typec_port *port = to_typec_port(dev);
984
985 if (port->cap->type != TYPEC_PORT_DRP)
986 return 0;
987
988 if (port->prefer_role < 0)
989 return 0;
990
991 return sprintf(buf, "%s\n", typec_roles[port->prefer_role]);
992}
993static DEVICE_ATTR_RW(preferred_role);
994
995static ssize_t data_role_store(struct device *dev,
996 struct device_attribute *attr,
997 const char *buf, size_t size)
998{
999 struct typec_port *port = to_typec_port(dev);
1000 int ret;
1001
1002 if (!port->cap->dr_set) {
1003 dev_dbg(dev, "data role swapping not supported\n");
1004 return -EOPNOTSUPP;
1005 }
1006
1007 ret = sysfs_match_string(typec_data_roles, buf);
1008 if (ret < 0)
1009 return ret;
1010
1011 mutex_lock(&port->port_type_lock);
1012 if (port->cap->data != TYPEC_PORT_DRD) {
1013 ret = -EOPNOTSUPP;
1014 goto unlock_and_ret;
1015 }
1016
1017 ret = port->cap->dr_set(port->cap, ret);
1018 if (ret)
1019 goto unlock_and_ret;
1020
1021 ret = size;
1022unlock_and_ret:
1023 mutex_unlock(&port->port_type_lock);
1024 return ret;
1025}
1026
1027static ssize_t data_role_show(struct device *dev,
1028 struct device_attribute *attr, char *buf)
1029{
1030 struct typec_port *port = to_typec_port(dev);
1031
1032 if (port->cap->data == TYPEC_PORT_DRD)
1033 return sprintf(buf, "%s\n", port->data_role == TYPEC_HOST ?
1034 "[host] device" : "host [device]");
1035
1036 return sprintf(buf, "[%s]\n", typec_data_roles[port->data_role]);
1037}
1038static DEVICE_ATTR_RW(data_role);
1039
1040static ssize_t power_role_store(struct device *dev,
1041 struct device_attribute *attr,
1042 const char *buf, size_t size)
1043{
1044 struct typec_port *port = to_typec_port(dev);
1045 int ret;
1046
1047 if (!port->cap->pd_revision) {
1048 dev_dbg(dev, "USB Power Delivery not supported\n");
1049 return -EOPNOTSUPP;
1050 }
1051
1052 if (!port->cap->pr_set) {
1053 dev_dbg(dev, "power role swapping not supported\n");
1054 return -EOPNOTSUPP;
1055 }
1056
1057 if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
1058 dev_dbg(dev, "partner unable to swap power role\n");
1059 return -EIO;
1060 }
1061
1062 ret = sysfs_match_string(typec_roles, buf);
1063 if (ret < 0)
1064 return ret;
1065
1066 mutex_lock(&port->port_type_lock);
1067 if (port->port_type != TYPEC_PORT_DRP) {
1068 dev_dbg(dev, "port type fixed at \"%s\"",
1069 typec_port_power_roles[port->port_type]);
1070 ret = -EOPNOTSUPP;
1071 goto unlock_and_ret;
1072 }
1073
1074 ret = port->cap->pr_set(port->cap, ret);
1075 if (ret)
1076 goto unlock_and_ret;
1077
1078 ret = size;
1079unlock_and_ret:
1080 mutex_unlock(&port->port_type_lock);
1081 return ret;
1082}
1083
1084static ssize_t power_role_show(struct device *dev,
1085 struct device_attribute *attr, char *buf)
1086{
1087 struct typec_port *port = to_typec_port(dev);
1088
1089 if (port->cap->type == TYPEC_PORT_DRP)
1090 return sprintf(buf, "%s\n", port->pwr_role == TYPEC_SOURCE ?
1091 "[source] sink" : "source [sink]");
1092
1093 return sprintf(buf, "[%s]\n", typec_roles[port->pwr_role]);
1094}
1095static DEVICE_ATTR_RW(power_role);
1096
1097static ssize_t
1098port_type_store(struct device *dev, struct device_attribute *attr,
1099 const char *buf, size_t size)
1100{
1101 struct typec_port *port = to_typec_port(dev);
1102 int ret;
1103 enum typec_port_type type;
1104
1105 if (!port->cap->port_type_set || port->cap->type != TYPEC_PORT_DRP) {
1106 dev_dbg(dev, "changing port type not supported\n");
1107 return -EOPNOTSUPP;
1108 }
1109
1110 ret = sysfs_match_string(typec_port_power_roles, buf);
1111 if (ret < 0)
1112 return ret;
1113
1114 type = ret;
1115 mutex_lock(&port->port_type_lock);
1116
1117 if (port->port_type == type) {
1118 ret = size;
1119 goto unlock_and_ret;
1120 }
1121
1122 ret = port->cap->port_type_set(port->cap, type);
1123 if (ret)
1124 goto unlock_and_ret;
1125
1126 port->port_type = type;
1127 ret = size;
1128
1129unlock_and_ret:
1130 mutex_unlock(&port->port_type_lock);
1131 return ret;
1132}
1133
1134static ssize_t
1135port_type_show(struct device *dev, struct device_attribute *attr,
1136 char *buf)
1137{
1138 struct typec_port *port = to_typec_port(dev);
1139
1140 if (port->cap->type == TYPEC_PORT_DRP)
1141 return sprintf(buf, "%s\n",
1142 typec_port_types_drp[port->port_type]);
1143
1144 return sprintf(buf, "[%s]\n", typec_port_power_roles[port->cap->type]);
1145}
1146static DEVICE_ATTR_RW(port_type);
1147
1148static const char * const typec_pwr_opmodes[] = {
1149 [TYPEC_PWR_MODE_USB] = "default",
1150 [TYPEC_PWR_MODE_1_5A] = "1.5A",
1151 [TYPEC_PWR_MODE_3_0A] = "3.0A",
1152 [TYPEC_PWR_MODE_PD] = "usb_power_delivery",
1153};
1154
1155static ssize_t power_operation_mode_show(struct device *dev,
1156 struct device_attribute *attr,
1157 char *buf)
1158{
1159 struct typec_port *port = to_typec_port(dev);
1160
1161 return sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]);
1162}
1163static DEVICE_ATTR_RO(power_operation_mode);
1164
1165static ssize_t vconn_source_store(struct device *dev,
1166 struct device_attribute *attr,
1167 const char *buf, size_t size)
1168{
1169 struct typec_port *port = to_typec_port(dev);
1170 bool source;
1171 int ret;
1172
1173 if (!port->cap->pd_revision) {
1174 dev_dbg(dev, "VCONN swap depends on USB Power Delivery\n");
1175 return -EOPNOTSUPP;
1176 }
1177
1178 if (!port->cap->vconn_set) {
1179 dev_dbg(dev, "VCONN swapping not supported\n");
1180 return -EOPNOTSUPP;
1181 }
1182
1183 ret = kstrtobool(buf, &source);
1184 if (ret)
1185 return ret;
1186
1187 ret = port->cap->vconn_set(port->cap, (enum typec_role)source);
1188 if (ret)
1189 return ret;
1190
1191 return size;
1192}
1193
1194static ssize_t vconn_source_show(struct device *dev,
1195 struct device_attribute *attr, char *buf)
1196{
1197 struct typec_port *port = to_typec_port(dev);
1198
1199 return sprintf(buf, "%s\n",
1200 port->vconn_role == TYPEC_SOURCE ? "yes" : "no");
1201}
1202static DEVICE_ATTR_RW(vconn_source);
1203
1204static ssize_t supported_accessory_modes_show(struct device *dev,
1205 struct device_attribute *attr,
1206 char *buf)
1207{
1208 struct typec_port *port = to_typec_port(dev);
1209 ssize_t ret = 0;
1210 int i;
1211
1212 for (i = 0; i < ARRAY_SIZE(port->cap->accessory); i++) {
1213 if (port->cap->accessory[i])
1214 ret += sprintf(buf + ret, "%s ",
1215 typec_accessory_modes[port->cap->accessory[i]]);
1216 }
1217
1218 if (!ret)
1219 return sprintf(buf, "none\n");
1220
1221 buf[ret - 1] = '\n';
1222
1223 return ret;
1224}
1225static DEVICE_ATTR_RO(supported_accessory_modes);
1226
1227static ssize_t usb_typec_revision_show(struct device *dev,
1228 struct device_attribute *attr,
1229 char *buf)
1230{
1231 struct typec_port *port = to_typec_port(dev);
1232 u16 rev = port->cap->revision;
1233
1234 return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
1235}
1236static DEVICE_ATTR_RO(usb_typec_revision);
1237
1238static ssize_t usb_power_delivery_revision_show(struct device *dev,
1239 struct device_attribute *attr,
1240 char *buf)
1241{
1242 struct typec_port *p = to_typec_port(dev);
1243
1244 return sprintf(buf, "%d\n", (p->cap->pd_revision >> 8) & 0xff);
1245}
1246static DEVICE_ATTR_RO(usb_power_delivery_revision);
1247
1248static struct attribute *typec_attrs[] = {
1249 &dev_attr_data_role.attr,
1250 &dev_attr_power_operation_mode.attr,
1251 &dev_attr_power_role.attr,
1252 &dev_attr_preferred_role.attr,
1253 &dev_attr_supported_accessory_modes.attr,
1254 &dev_attr_usb_power_delivery_revision.attr,
1255 &dev_attr_usb_typec_revision.attr,
1256 &dev_attr_vconn_source.attr,
1257 &dev_attr_port_type.attr,
1258 NULL,
1259};
1260ATTRIBUTE_GROUPS(typec);
1261
1262static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
1263{
1264 int ret;
1265
1266 ret = add_uevent_var(env, "TYPEC_PORT=%s", dev_name(dev));
1267 if (ret)
1268 dev_err(dev, "failed to add uevent TYPEC_PORT\n");
1269
1270 return ret;
1271}
1272
1273static void typec_release(struct device *dev)
1274{
1275 struct typec_port *port = to_typec_port(dev);
1276
1277 ida_simple_remove(&typec_index_ida, port->id);
1278 ida_destroy(&port->mode_ids);
1279 typec_switch_put(port->sw);
1280 typec_mux_put(port->mux);
1281 kfree(port);
1282}
1283
1284const struct device_type typec_port_dev_type = {
1285 .name = "typec_port",
1286 .groups = typec_groups,
1287 .uevent = typec_uevent,
1288 .release = typec_release,
1289};
1290
1291/* --------------------------------------- */
1292/* Driver callbacks to report role updates */
1293
1294/**
1295 * typec_set_data_role - Report data role change
1296 * @port: The USB Type-C Port where the role was changed
1297 * @role: The new data role
1298 *
1299 * This routine is used by the port drivers to report data role changes.
1300 */
1301void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
1302{
1303 if (port->data_role == role)
1304 return;
1305
1306 port->data_role = role;
1307 sysfs_notify(&port->dev.kobj, NULL, "data_role");
1308 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1309}
1310EXPORT_SYMBOL_GPL(typec_set_data_role);
1311
1312/**
1313 * typec_set_pwr_role - Report power role change
1314 * @port: The USB Type-C Port where the role was changed
1315 * @role: The new data role
1316 *
1317 * This routine is used by the port drivers to report power role changes.
1318 */
1319void typec_set_pwr_role(struct typec_port *port, enum typec_role role)
1320{
1321 if (port->pwr_role == role)
1322 return;
1323
1324 port->pwr_role = role;
1325 sysfs_notify(&port->dev.kobj, NULL, "power_role");
1326 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1327}
1328EXPORT_SYMBOL_GPL(typec_set_pwr_role);
1329
1330/**
1331 * typec_set_vconn_role - Report VCONN source change
1332 * @port: The USB Type-C Port which VCONN role changed
1333 * @role: Source when @port is sourcing VCONN, or Sink when it's not
1334 *
1335 * This routine is used by the port drivers to report if the VCONN source is
1336 * changes.
1337 */
1338void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
1339{
1340 if (port->vconn_role == role)
1341 return;
1342
1343 port->vconn_role = role;
1344 sysfs_notify(&port->dev.kobj, NULL, "vconn_source");
1345 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1346}
1347EXPORT_SYMBOL_GPL(typec_set_vconn_role);
1348
1349static int partner_match(struct device *dev, void *data)
1350{
1351 return is_typec_partner(dev);
1352}
1353
1354/**
1355 * typec_set_pwr_opmode - Report changed power operation mode
1356 * @port: The USB Type-C Port where the mode was changed
1357 * @opmode: New power operation mode
1358 *
1359 * This routine is used by the port drivers to report changed power operation
1360 * mode in @port. The modes are USB (default), 1.5A, 3.0A as defined in USB
1361 * Type-C specification, and "USB Power Delivery" when the power levels are
1362 * negotiated with methods defined in USB Power Delivery specification.
1363 */
1364void typec_set_pwr_opmode(struct typec_port *port,
1365 enum typec_pwr_opmode opmode)
1366{
1367 struct device *partner_dev;
1368
1369 if (port->pwr_opmode == opmode)
1370 return;
1371
1372 port->pwr_opmode = opmode;
1373 sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
1374 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1375
1376 partner_dev = device_find_child(&port->dev, NULL, partner_match);
1377 if (partner_dev) {
1378 struct typec_partner *partner = to_typec_partner(partner_dev);
1379
1380 if (opmode == TYPEC_PWR_MODE_PD && !partner->usb_pd) {
1381 partner->usb_pd = 1;
1382 sysfs_notify(&partner_dev->kobj, NULL,
1383 "supports_usb_power_delivery");
1384 }
1385 put_device(partner_dev);
1386 }
1387}
1388EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
1389
1390/**
1391 * typec_find_port_power_role - Get the typec port power capability
1392 * @name: port power capability string
1393 *
1394 * This routine is used to find the typec_port_type by its string name.
1395 *
1396 * Returns typec_port_type if success, otherwise negative error code.
1397 */
1398int typec_find_port_power_role(const char *name)
1399{
1400 return match_string(typec_port_power_roles,
1401 ARRAY_SIZE(typec_port_power_roles), name);
1402}
1403EXPORT_SYMBOL_GPL(typec_find_port_power_role);
1404
1405/**
1406 * typec_find_power_role - Find the typec one specific power role
1407 * @name: power role string
1408 *
1409 * This routine is used to find the typec_role by its string name.
1410 *
1411 * Returns typec_role if success, otherwise negative error code.
1412 */
1413int typec_find_power_role(const char *name)
1414{
1415 return match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
1416}
1417EXPORT_SYMBOL_GPL(typec_find_power_role);
1418
1419/**
1420 * typec_find_port_data_role - Get the typec port data capability
1421 * @name: port data capability string
1422 *
1423 * This routine is used to find the typec_port_data by its string name.
1424 *
1425 * Returns typec_port_data if success, otherwise negative error code.
1426 */
1427int typec_find_port_data_role(const char *name)
1428{
1429 return match_string(typec_port_data_roles,
1430 ARRAY_SIZE(typec_port_data_roles), name);
1431}
1432EXPORT_SYMBOL_GPL(typec_find_port_data_role);
1433
1434/* ------------------------------------------ */
1435/* API for Multiplexer/DeMultiplexer Switches */
1436
1437/**
1438 * typec_set_orientation - Set USB Type-C cable plug orientation
1439 * @port: USB Type-C Port
1440 * @orientation: USB Type-C cable plug orientation
1441 *
1442 * Set cable plug orientation for @port.
1443 */
1444int typec_set_orientation(struct typec_port *port,
1445 enum typec_orientation orientation)
1446{
1447 int ret;
1448
1449 if (port->sw) {
1450 ret = port->sw->set(port->sw, orientation);
1451 if (ret)
1452 return ret;
1453 }
1454
1455 port->orientation = orientation;
1456
1457 return 0;
1458}
1459EXPORT_SYMBOL_GPL(typec_set_orientation);
1460
1461/**
1462 * typec_get_orientation - Get USB Type-C cable plug orientation
1463 * @port: USB Type-C Port
1464 *
1465 * Get current cable plug orientation for @port.
1466 */
1467enum typec_orientation typec_get_orientation(struct typec_port *port)
1468{
1469 return port->orientation;
1470}
1471EXPORT_SYMBOL_GPL(typec_get_orientation);
1472
1473/**
1474 * typec_set_mode - Set mode of operation for USB Type-C connector
1475 * @port: USB Type-C connector
1476 * @mode: Accessory Mode, USB Operation or Safe State
1477 *
1478 * Configure @port for Accessory Mode @mode. This function will configure the
1479 * muxes needed for @mode.
1480 */
1481int typec_set_mode(struct typec_port *port, int mode)
1482{
1483 return port->mux ? port->mux->set(port->mux, mode) : 0;
1484}
1485EXPORT_SYMBOL_GPL(typec_set_mode);
1486
1487/* --------------------------------------- */
1488
1489/**
1490 * typec_port_register_altmode - Register USB Type-C Port Alternate Mode
1491 * @port: USB Type-C Port that supports the alternate mode
1492 * @desc: Description of the alternate mode
1493 *
1494 * This routine is used to register an alternate mode that @port is capable of
1495 * supporting.
1496 *
1497 * Returns handle to the alternate mode on success or ERR_PTR on failure.
1498 */
1499struct typec_altmode *
1500typec_port_register_altmode(struct typec_port *port,
1501 const struct typec_altmode_desc *desc)
1502{
1503 struct typec_altmode *adev;
1504 struct typec_mux *mux;
1505
1506 mux = typec_mux_get(&port->dev, desc);
1507 if (IS_ERR(mux))
1508 return ERR_CAST(mux);
1509
1510 adev = typec_register_altmode(&port->dev, desc);
1511 if (IS_ERR(adev))
1512 typec_mux_put(mux);
1513 else
1514 to_altmode(adev)->mux = mux;
1515
1516 return adev;
1517}
1518EXPORT_SYMBOL_GPL(typec_port_register_altmode);
1519
1520/**
1521 * typec_register_port - Register a USB Type-C Port
1522 * @parent: Parent device
1523 * @cap: Description of the port
1524 *
1525 * Registers a device for USB Type-C Port described in @cap.
1526 *
1527 * Returns handle to the port on success or ERR_PTR on failure.
1528 */
1529struct typec_port *typec_register_port(struct device *parent,
1530 const struct typec_capability *cap)
1531{
1532 struct typec_port *port;
1533 int ret;
1534 int id;
1535
1536 port = kzalloc(sizeof(*port), GFP_KERNEL);
1537 if (!port)
1538 return ERR_PTR(-ENOMEM);
1539
1540 id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL);
1541 if (id < 0) {
1542 kfree(port);
1543 return ERR_PTR(id);
1544 }
1545
1546 switch (cap->type) {
1547 case TYPEC_PORT_SRC:
1548 port->pwr_role = TYPEC_SOURCE;
1549 port->vconn_role = TYPEC_SOURCE;
1550 break;
1551 case TYPEC_PORT_SNK:
1552 port->pwr_role = TYPEC_SINK;
1553 port->vconn_role = TYPEC_SINK;
1554 break;
1555 case TYPEC_PORT_DRP:
1556 if (cap->prefer_role != TYPEC_NO_PREFERRED_ROLE)
1557 port->pwr_role = cap->prefer_role;
1558 else
1559 port->pwr_role = TYPEC_SINK;
1560 break;
1561 }
1562
1563 switch (cap->data) {
1564 case TYPEC_PORT_DFP:
1565 port->data_role = TYPEC_HOST;
1566 break;
1567 case TYPEC_PORT_UFP:
1568 port->data_role = TYPEC_DEVICE;
1569 break;
1570 case TYPEC_PORT_DRD:
1571 if (cap->prefer_role == TYPEC_SOURCE)
1572 port->data_role = TYPEC_HOST;
1573 else
1574 port->data_role = TYPEC_DEVICE;
1575 break;
1576 }
1577
1578 ida_init(&port->mode_ids);
1579 mutex_init(&port->port_type_lock);
1580
1581 port->id = id;
1582 port->cap = cap;
1583 port->port_type = cap->type;
1584 port->prefer_role = cap->prefer_role;
1585
1586 device_initialize(&port->dev);
1587 port->dev.class = typec_class;
1588 port->dev.parent = parent;
1589 port->dev.fwnode = cap->fwnode;
1590 port->dev.type = &typec_port_dev_type;
1591 dev_set_name(&port->dev, "port%d", id);
1592
1593 port->sw = typec_switch_get(&port->dev);
1594 if (IS_ERR(port->sw)) {
1595 put_device(&port->dev);
1596 return ERR_CAST(port->sw);
1597 }
1598
1599 port->mux = typec_mux_get(&port->dev, NULL);
1600 if (IS_ERR(port->mux)) {
1601 put_device(&port->dev);
1602 return ERR_CAST(port->mux);
1603 }
1604
1605 ret = device_add(&port->dev);
1606 if (ret) {
1607 dev_err(parent, "failed to register port (%d)\n", ret);
1608 put_device(&port->dev);
1609 return ERR_PTR(ret);
1610 }
1611
1612 return port;
1613}
1614EXPORT_SYMBOL_GPL(typec_register_port);
1615
1616/**
1617 * typec_unregister_port - Unregister a USB Type-C Port
1618 * @port: The port to be unregistered
1619 *
1620 * Unregister device created with typec_register_port().
1621 */
1622void typec_unregister_port(struct typec_port *port)
1623{
1624 if (!IS_ERR_OR_NULL(port))
1625 device_unregister(&port->dev);
1626}
1627EXPORT_SYMBOL_GPL(typec_unregister_port);
1628
1629static int __init typec_init(void)
1630{
1631 int ret;
1632
1633 ret = bus_register(&typec_bus);
1634 if (ret)
1635 return ret;
1636
1637 ret = class_register(&typec_mux_class);
1638 if (ret)
1639 goto err_unregister_bus;
1640
1641 typec_class = class_create(THIS_MODULE, "typec");
1642 if (IS_ERR(typec_class)) {
1643 ret = PTR_ERR(typec_class);
1644 goto err_unregister_mux_class;
1645 }
1646
1647 return 0;
1648
1649err_unregister_mux_class:
1650 class_unregister(&typec_mux_class);
1651
1652err_unregister_bus:
1653 bus_unregister(&typec_bus);
1654
1655 return ret;
1656}
1657subsys_initcall(typec_init);
1658
1659static void __exit typec_exit(void)
1660{
1661 class_destroy(typec_class);
1662 ida_destroy(&typec_index_ida);
1663 bus_unregister(&typec_bus);
1664 class_unregister(&typec_mux_class);
1665}
1666module_exit(typec_exit);
1667
1668MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
1669MODULE_LICENSE("GPL v2");
1670MODULE_DESCRIPTION("USB Type-C Connector Class");