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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 const struct typec_operations *ops;
57};
58
59#define to_typec_port(_dev_) container_of(_dev_, struct typec_port, dev)
60#define to_typec_plug(_dev_) container_of(_dev_, struct typec_plug, dev)
61#define to_typec_cable(_dev_) container_of(_dev_, struct typec_cable, dev)
62#define to_typec_partner(_dev_) container_of(_dev_, struct typec_partner, dev)
63
64static const struct device_type typec_partner_dev_type;
65static const struct device_type typec_cable_dev_type;
66static const struct device_type typec_plug_dev_type;
67
68#define is_typec_partner(_dev_) (_dev_->type == &typec_partner_dev_type)
69#define is_typec_cable(_dev_) (_dev_->type == &typec_cable_dev_type)
70#define is_typec_plug(_dev_) (_dev_->type == &typec_plug_dev_type)
71
72static DEFINE_IDA(typec_index_ida);
73static struct class *typec_class;
74
75/* ------------------------------------------------------------------------- */
76/* Common attributes */
77
78static const char * const typec_accessory_modes[] = {
79 [TYPEC_ACCESSORY_NONE] = "none",
80 [TYPEC_ACCESSORY_AUDIO] = "analog_audio",
81 [TYPEC_ACCESSORY_DEBUG] = "debug",
82};
83
84static struct usb_pd_identity *get_pd_identity(struct device *dev)
85{
86 if (is_typec_partner(dev)) {
87 struct typec_partner *partner = to_typec_partner(dev);
88
89 return partner->identity;
90 } else if (is_typec_cable(dev)) {
91 struct typec_cable *cable = to_typec_cable(dev);
92
93 return cable->identity;
94 }
95 return NULL;
96}
97
98static ssize_t id_header_show(struct device *dev, struct device_attribute *attr,
99 char *buf)
100{
101 struct usb_pd_identity *id = get_pd_identity(dev);
102
103 return sprintf(buf, "0x%08x\n", id->id_header);
104}
105static DEVICE_ATTR_RO(id_header);
106
107static ssize_t cert_stat_show(struct device *dev, struct device_attribute *attr,
108 char *buf)
109{
110 struct usb_pd_identity *id = get_pd_identity(dev);
111
112 return sprintf(buf, "0x%08x\n", id->cert_stat);
113}
114static DEVICE_ATTR_RO(cert_stat);
115
116static ssize_t product_show(struct device *dev, struct device_attribute *attr,
117 char *buf)
118{
119 struct usb_pd_identity *id = get_pd_identity(dev);
120
121 return sprintf(buf, "0x%08x\n", id->product);
122}
123static DEVICE_ATTR_RO(product);
124
125static struct attribute *usb_pd_id_attrs[] = {
126 &dev_attr_id_header.attr,
127 &dev_attr_cert_stat.attr,
128 &dev_attr_product.attr,
129 NULL
130};
131
132static const struct attribute_group usb_pd_id_group = {
133 .name = "identity",
134 .attrs = usb_pd_id_attrs,
135};
136
137static const struct attribute_group *usb_pd_id_groups[] = {
138 &usb_pd_id_group,
139 NULL,
140};
141
142static void typec_report_identity(struct device *dev)
143{
144 sysfs_notify(&dev->kobj, "identity", "id_header");
145 sysfs_notify(&dev->kobj, "identity", "cert_stat");
146 sysfs_notify(&dev->kobj, "identity", "product");
147}
148
149/* ------------------------------------------------------------------------- */
150/* Alternate Modes */
151
152static int altmode_match(struct device *dev, void *data)
153{
154 struct typec_altmode *adev = to_typec_altmode(dev);
155 struct typec_device_id *id = data;
156
157 if (!is_typec_altmode(dev))
158 return 0;
159
160 return ((adev->svid == id->svid) && (adev->mode == id->mode));
161}
162
163static void typec_altmode_set_partner(struct altmode *altmode)
164{
165 struct typec_altmode *adev = &altmode->adev;
166 struct typec_device_id id = { adev->svid, adev->mode, };
167 struct typec_port *port = typec_altmode2port(adev);
168 struct altmode *partner;
169 struct device *dev;
170
171 dev = device_find_child(&port->dev, &id, altmode_match);
172 if (!dev)
173 return;
174
175 /* Bind the port alt mode to the partner/plug alt mode. */
176 partner = to_altmode(to_typec_altmode(dev));
177 altmode->partner = partner;
178
179 /* Bind the partner/plug alt mode to the port alt mode. */
180 if (is_typec_plug(adev->dev.parent)) {
181 struct typec_plug *plug = to_typec_plug(adev->dev.parent);
182
183 partner->plug[plug->index] = altmode;
184 } else {
185 partner->partner = altmode;
186 }
187}
188
189static void typec_altmode_put_partner(struct altmode *altmode)
190{
191 struct altmode *partner = altmode->partner;
192 struct typec_altmode *adev;
193
194 if (!partner)
195 return;
196
197 adev = &partner->adev;
198
199 if (is_typec_plug(adev->dev.parent)) {
200 struct typec_plug *plug = to_typec_plug(adev->dev.parent);
201
202 partner->plug[plug->index] = NULL;
203 } else {
204 partner->partner = NULL;
205 }
206 put_device(&adev->dev);
207}
208
209/**
210 * typec_altmode_update_active - Report Enter/Exit mode
211 * @adev: Handle to the alternate mode
212 * @active: True when the mode has been entered
213 *
214 * If a partner or cable plug executes Enter/Exit Mode command successfully, the
215 * drivers use this routine to report the updated state of the mode.
216 */
217void typec_altmode_update_active(struct typec_altmode *adev, bool active)
218{
219 char dir[6];
220
221 if (adev->active == active)
222 return;
223
224 if (!is_typec_port(adev->dev.parent) && adev->dev.driver) {
225 if (!active)
226 module_put(adev->dev.driver->owner);
227 else
228 WARN_ON(!try_module_get(adev->dev.driver->owner));
229 }
230
231 adev->active = active;
232 snprintf(dir, sizeof(dir), "mode%d", adev->mode);
233 sysfs_notify(&adev->dev.kobj, dir, "active");
234 sysfs_notify(&adev->dev.kobj, NULL, "active");
235 kobject_uevent(&adev->dev.kobj, KOBJ_CHANGE);
236}
237EXPORT_SYMBOL_GPL(typec_altmode_update_active);
238
239/**
240 * typec_altmode2port - Alternate Mode to USB Type-C port
241 * @alt: The Alternate Mode
242 *
243 * Returns handle to the port that a cable plug or partner with @alt is
244 * connected to.
245 */
246struct typec_port *typec_altmode2port(struct typec_altmode *alt)
247{
248 if (is_typec_plug(alt->dev.parent))
249 return to_typec_port(alt->dev.parent->parent->parent);
250 if (is_typec_partner(alt->dev.parent))
251 return to_typec_port(alt->dev.parent->parent);
252 if (is_typec_port(alt->dev.parent))
253 return to_typec_port(alt->dev.parent);
254
255 return NULL;
256}
257EXPORT_SYMBOL_GPL(typec_altmode2port);
258
259static ssize_t
260vdo_show(struct device *dev, struct device_attribute *attr, char *buf)
261{
262 struct typec_altmode *alt = to_typec_altmode(dev);
263
264 return sprintf(buf, "0x%08x\n", alt->vdo);
265}
266static DEVICE_ATTR_RO(vdo);
267
268static ssize_t
269description_show(struct device *dev, struct device_attribute *attr, char *buf)
270{
271 struct typec_altmode *alt = to_typec_altmode(dev);
272
273 return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
274}
275static DEVICE_ATTR_RO(description);
276
277static ssize_t
278active_show(struct device *dev, struct device_attribute *attr, char *buf)
279{
280 struct typec_altmode *alt = to_typec_altmode(dev);
281
282 return sprintf(buf, "%s\n", alt->active ? "yes" : "no");
283}
284
285static ssize_t active_store(struct device *dev, struct device_attribute *attr,
286 const char *buf, size_t size)
287{
288 struct typec_altmode *adev = to_typec_altmode(dev);
289 struct altmode *altmode = to_altmode(adev);
290 bool enter;
291 int ret;
292
293 ret = kstrtobool(buf, &enter);
294 if (ret)
295 return ret;
296
297 if (adev->active == enter)
298 return size;
299
300 if (is_typec_port(adev->dev.parent)) {
301 typec_altmode_update_active(adev, enter);
302
303 /* Make sure that the partner exits the mode before disabling */
304 if (altmode->partner && !enter && altmode->partner->adev.active)
305 typec_altmode_exit(&altmode->partner->adev);
306 } else if (altmode->partner) {
307 if (enter && !altmode->partner->adev.active) {
308 dev_warn(dev, "port has the mode disabled\n");
309 return -EPERM;
310 }
311 }
312
313 /* Note: If there is no driver, the mode will not be entered */
314 if (adev->ops && adev->ops->activate) {
315 ret = adev->ops->activate(adev, enter);
316 if (ret)
317 return ret;
318 }
319
320 return size;
321}
322static DEVICE_ATTR_RW(active);
323
324static ssize_t
325supported_roles_show(struct device *dev, struct device_attribute *attr,
326 char *buf)
327{
328 struct altmode *alt = to_altmode(to_typec_altmode(dev));
329 ssize_t ret;
330
331 switch (alt->roles) {
332 case TYPEC_PORT_SRC:
333 ret = sprintf(buf, "source\n");
334 break;
335 case TYPEC_PORT_SNK:
336 ret = sprintf(buf, "sink\n");
337 break;
338 case TYPEC_PORT_DRP:
339 default:
340 ret = sprintf(buf, "source sink\n");
341 break;
342 }
343 return ret;
344}
345static DEVICE_ATTR_RO(supported_roles);
346
347static ssize_t
348mode_show(struct device *dev, struct device_attribute *attr, char *buf)
349{
350 struct typec_altmode *adev = to_typec_altmode(dev);
351
352 return sprintf(buf, "%u\n", adev->mode);
353}
354static DEVICE_ATTR_RO(mode);
355
356static ssize_t
357svid_show(struct device *dev, struct device_attribute *attr, char *buf)
358{
359 struct typec_altmode *adev = to_typec_altmode(dev);
360
361 return sprintf(buf, "%04x\n", adev->svid);
362}
363static DEVICE_ATTR_RO(svid);
364
365static struct attribute *typec_altmode_attrs[] = {
366 &dev_attr_active.attr,
367 &dev_attr_mode.attr,
368 &dev_attr_svid.attr,
369 &dev_attr_vdo.attr,
370 NULL
371};
372
373static umode_t typec_altmode_attr_is_visible(struct kobject *kobj,
374 struct attribute *attr, int n)
375{
376 struct typec_altmode *adev = to_typec_altmode(kobj_to_dev(kobj));
377
378 if (attr == &dev_attr_active.attr)
379 if (!adev->ops || !adev->ops->activate)
380 return 0444;
381
382 return attr->mode;
383}
384
385static struct attribute_group typec_altmode_group = {
386 .is_visible = typec_altmode_attr_is_visible,
387 .attrs = typec_altmode_attrs,
388};
389
390static const struct attribute_group *typec_altmode_groups[] = {
391 &typec_altmode_group,
392 NULL
393};
394
395static int altmode_id_get(struct device *dev)
396{
397 struct ida *ids;
398
399 if (is_typec_partner(dev))
400 ids = &to_typec_partner(dev)->mode_ids;
401 else if (is_typec_plug(dev))
402 ids = &to_typec_plug(dev)->mode_ids;
403 else
404 ids = &to_typec_port(dev)->mode_ids;
405
406 return ida_simple_get(ids, 0, 0, GFP_KERNEL);
407}
408
409static void altmode_id_remove(struct device *dev, int id)
410{
411 struct ida *ids;
412
413 if (is_typec_partner(dev))
414 ids = &to_typec_partner(dev)->mode_ids;
415 else if (is_typec_plug(dev))
416 ids = &to_typec_plug(dev)->mode_ids;
417 else
418 ids = &to_typec_port(dev)->mode_ids;
419
420 ida_simple_remove(ids, id);
421}
422
423static void typec_altmode_release(struct device *dev)
424{
425 struct altmode *alt = to_altmode(to_typec_altmode(dev));
426
427 typec_altmode_put_partner(alt);
428
429 altmode_id_remove(alt->adev.dev.parent, alt->id);
430 kfree(alt);
431}
432
433const struct device_type typec_altmode_dev_type = {
434 .name = "typec_alternate_mode",
435 .groups = typec_altmode_groups,
436 .release = typec_altmode_release,
437};
438
439static struct typec_altmode *
440typec_register_altmode(struct device *parent,
441 const struct typec_altmode_desc *desc)
442{
443 unsigned int id = altmode_id_get(parent);
444 bool is_port = is_typec_port(parent);
445 struct altmode *alt;
446 int ret;
447
448 alt = kzalloc(sizeof(*alt), GFP_KERNEL);
449 if (!alt)
450 return ERR_PTR(-ENOMEM);
451
452 alt->adev.svid = desc->svid;
453 alt->adev.mode = desc->mode;
454 alt->adev.vdo = desc->vdo;
455 alt->roles = desc->roles;
456 alt->id = id;
457
458 alt->attrs[0] = &dev_attr_vdo.attr;
459 alt->attrs[1] = &dev_attr_description.attr;
460 alt->attrs[2] = &dev_attr_active.attr;
461
462 if (is_port) {
463 alt->attrs[3] = &dev_attr_supported_roles.attr;
464 alt->adev.active = true; /* Enabled by default */
465 }
466
467 sprintf(alt->group_name, "mode%d", desc->mode);
468 alt->group.name = alt->group_name;
469 alt->group.attrs = alt->attrs;
470 alt->groups[0] = &alt->group;
471
472 alt->adev.dev.parent = parent;
473 alt->adev.dev.groups = alt->groups;
474 alt->adev.dev.type = &typec_altmode_dev_type;
475 dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id);
476
477 /* Link partners and plugs with the ports */
478 if (!is_port)
479 typec_altmode_set_partner(alt);
480
481 /* The partners are bind to drivers */
482 if (is_typec_partner(parent))
483 alt->adev.dev.bus = &typec_bus;
484
485 ret = device_register(&alt->adev.dev);
486 if (ret) {
487 dev_err(parent, "failed to register alternate mode (%d)\n",
488 ret);
489 put_device(&alt->adev.dev);
490 return ERR_PTR(ret);
491 }
492
493 return &alt->adev;
494}
495
496/**
497 * typec_unregister_altmode - Unregister Alternate Mode
498 * @adev: The alternate mode to be unregistered
499 *
500 * Unregister device created with typec_partner_register_altmode(),
501 * typec_plug_register_altmode() or typec_port_register_altmode().
502 */
503void typec_unregister_altmode(struct typec_altmode *adev)
504{
505 if (IS_ERR_OR_NULL(adev))
506 return;
507 typec_mux_put(to_altmode(adev)->mux);
508 device_unregister(&adev->dev);
509}
510EXPORT_SYMBOL_GPL(typec_unregister_altmode);
511
512/* ------------------------------------------------------------------------- */
513/* Type-C Partners */
514
515static ssize_t accessory_mode_show(struct device *dev,
516 struct device_attribute *attr,
517 char *buf)
518{
519 struct typec_partner *p = to_typec_partner(dev);
520
521 return sprintf(buf, "%s\n", typec_accessory_modes[p->accessory]);
522}
523static DEVICE_ATTR_RO(accessory_mode);
524
525static ssize_t supports_usb_power_delivery_show(struct device *dev,
526 struct device_attribute *attr,
527 char *buf)
528{
529 struct typec_partner *p = to_typec_partner(dev);
530
531 return sprintf(buf, "%s\n", p->usb_pd ? "yes" : "no");
532}
533static DEVICE_ATTR_RO(supports_usb_power_delivery);
534
535static struct attribute *typec_partner_attrs[] = {
536 &dev_attr_accessory_mode.attr,
537 &dev_attr_supports_usb_power_delivery.attr,
538 NULL
539};
540ATTRIBUTE_GROUPS(typec_partner);
541
542static void typec_partner_release(struct device *dev)
543{
544 struct typec_partner *partner = to_typec_partner(dev);
545
546 ida_destroy(&partner->mode_ids);
547 kfree(partner);
548}
549
550static const struct device_type typec_partner_dev_type = {
551 .name = "typec_partner",
552 .groups = typec_partner_groups,
553 .release = typec_partner_release,
554};
555
556/**
557 * typec_partner_set_identity - Report result from Discover Identity command
558 * @partner: The partner updated identity values
559 *
560 * This routine is used to report that the result of Discover Identity USB power
561 * delivery command has become available.
562 */
563int typec_partner_set_identity(struct typec_partner *partner)
564{
565 if (!partner->identity)
566 return -EINVAL;
567
568 typec_report_identity(&partner->dev);
569 return 0;
570}
571EXPORT_SYMBOL_GPL(typec_partner_set_identity);
572
573/**
574 * typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode
575 * @partner: USB Type-C Partner that supports the alternate mode
576 * @desc: Description of the alternate mode
577 *
578 * This routine is used to register each alternate mode individually that
579 * @partner has listed in response to Discover SVIDs command. The modes for a
580 * SVID listed in response to Discover Modes command need to be listed in an
581 * array in @desc.
582 *
583 * Returns handle to the alternate mode on success or ERR_PTR on failure.
584 */
585struct typec_altmode *
586typec_partner_register_altmode(struct typec_partner *partner,
587 const struct typec_altmode_desc *desc)
588{
589 return typec_register_altmode(&partner->dev, desc);
590}
591EXPORT_SYMBOL_GPL(typec_partner_register_altmode);
592
593/**
594 * typec_register_partner - Register a USB Type-C Partner
595 * @port: The USB Type-C Port the partner is connected to
596 * @desc: Description of the partner
597 *
598 * Registers a device for USB Type-C Partner described in @desc.
599 *
600 * Returns handle to the partner on success or ERR_PTR on failure.
601 */
602struct typec_partner *typec_register_partner(struct typec_port *port,
603 struct typec_partner_desc *desc)
604{
605 struct typec_partner *partner;
606 int ret;
607
608 partner = kzalloc(sizeof(*partner), GFP_KERNEL);
609 if (!partner)
610 return ERR_PTR(-ENOMEM);
611
612 ida_init(&partner->mode_ids);
613 partner->usb_pd = desc->usb_pd;
614 partner->accessory = desc->accessory;
615
616 if (desc->identity) {
617 /*
618 * Creating directory for the identity only if the driver is
619 * able to provide data to it.
620 */
621 partner->dev.groups = usb_pd_id_groups;
622 partner->identity = desc->identity;
623 }
624
625 partner->dev.class = typec_class;
626 partner->dev.parent = &port->dev;
627 partner->dev.type = &typec_partner_dev_type;
628 dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev));
629
630 ret = device_register(&partner->dev);
631 if (ret) {
632 dev_err(&port->dev, "failed to register partner (%d)\n", ret);
633 put_device(&partner->dev);
634 return ERR_PTR(ret);
635 }
636
637 return partner;
638}
639EXPORT_SYMBOL_GPL(typec_register_partner);
640
641/**
642 * typec_unregister_partner - Unregister a USB Type-C Partner
643 * @partner: The partner to be unregistered
644 *
645 * Unregister device created with typec_register_partner().
646 */
647void typec_unregister_partner(struct typec_partner *partner)
648{
649 if (!IS_ERR_OR_NULL(partner))
650 device_unregister(&partner->dev);
651}
652EXPORT_SYMBOL_GPL(typec_unregister_partner);
653
654/* ------------------------------------------------------------------------- */
655/* Type-C Cable Plugs */
656
657static void typec_plug_release(struct device *dev)
658{
659 struct typec_plug *plug = to_typec_plug(dev);
660
661 ida_destroy(&plug->mode_ids);
662 kfree(plug);
663}
664
665static const struct device_type typec_plug_dev_type = {
666 .name = "typec_plug",
667 .release = typec_plug_release,
668};
669
670/**
671 * typec_plug_register_altmode - Register USB Type-C Cable Plug Alternate Mode
672 * @plug: USB Type-C Cable Plug that supports the alternate mode
673 * @desc: Description of the alternate mode
674 *
675 * This routine is used to register each alternate mode individually that @plug
676 * has listed in response to Discover SVIDs command. The modes for a SVID that
677 * the plug lists in response to Discover Modes command need to be listed in an
678 * array in @desc.
679 *
680 * Returns handle to the alternate mode on success or ERR_PTR on failure.
681 */
682struct typec_altmode *
683typec_plug_register_altmode(struct typec_plug *plug,
684 const struct typec_altmode_desc *desc)
685{
686 return typec_register_altmode(&plug->dev, desc);
687}
688EXPORT_SYMBOL_GPL(typec_plug_register_altmode);
689
690/**
691 * typec_register_plug - Register a USB Type-C Cable Plug
692 * @cable: USB Type-C Cable with the plug
693 * @desc: Description of the cable plug
694 *
695 * Registers a device for USB Type-C Cable Plug described in @desc. A USB Type-C
696 * Cable Plug represents a plug with electronics in it that can response to USB
697 * Power Delivery SOP Prime or SOP Double Prime packages.
698 *
699 * Returns handle to the cable plug on success or ERR_PTR on failure.
700 */
701struct typec_plug *typec_register_plug(struct typec_cable *cable,
702 struct typec_plug_desc *desc)
703{
704 struct typec_plug *plug;
705 char name[8];
706 int ret;
707
708 plug = kzalloc(sizeof(*plug), GFP_KERNEL);
709 if (!plug)
710 return ERR_PTR(-ENOMEM);
711
712 sprintf(name, "plug%d", desc->index);
713
714 ida_init(&plug->mode_ids);
715 plug->index = desc->index;
716 plug->dev.class = typec_class;
717 plug->dev.parent = &cable->dev;
718 plug->dev.type = &typec_plug_dev_type;
719 dev_set_name(&plug->dev, "%s-%s", dev_name(cable->dev.parent), name);
720
721 ret = device_register(&plug->dev);
722 if (ret) {
723 dev_err(&cable->dev, "failed to register plug (%d)\n", ret);
724 put_device(&plug->dev);
725 return ERR_PTR(ret);
726 }
727
728 return plug;
729}
730EXPORT_SYMBOL_GPL(typec_register_plug);
731
732/**
733 * typec_unregister_plug - Unregister a USB Type-C Cable Plug
734 * @plug: The cable plug to be unregistered
735 *
736 * Unregister device created with typec_register_plug().
737 */
738void typec_unregister_plug(struct typec_plug *plug)
739{
740 if (!IS_ERR_OR_NULL(plug))
741 device_unregister(&plug->dev);
742}
743EXPORT_SYMBOL_GPL(typec_unregister_plug);
744
745/* Type-C Cables */
746
747static ssize_t
748type_show(struct device *dev, struct device_attribute *attr, char *buf)
749{
750 struct typec_cable *cable = to_typec_cable(dev);
751
752 return sprintf(buf, "%s\n", cable->active ? "active" : "passive");
753}
754static DEVICE_ATTR_RO(type);
755
756static const char * const typec_plug_types[] = {
757 [USB_PLUG_NONE] = "unknown",
758 [USB_PLUG_TYPE_A] = "type-a",
759 [USB_PLUG_TYPE_B] = "type-b",
760 [USB_PLUG_TYPE_C] = "type-c",
761 [USB_PLUG_CAPTIVE] = "captive",
762};
763
764static ssize_t plug_type_show(struct device *dev,
765 struct device_attribute *attr, char *buf)
766{
767 struct typec_cable *cable = to_typec_cable(dev);
768
769 return sprintf(buf, "%s\n", typec_plug_types[cable->type]);
770}
771static DEVICE_ATTR_RO(plug_type);
772
773static struct attribute *typec_cable_attrs[] = {
774 &dev_attr_type.attr,
775 &dev_attr_plug_type.attr,
776 NULL
777};
778ATTRIBUTE_GROUPS(typec_cable);
779
780static void typec_cable_release(struct device *dev)
781{
782 struct typec_cable *cable = to_typec_cable(dev);
783
784 kfree(cable);
785}
786
787static const struct device_type typec_cable_dev_type = {
788 .name = "typec_cable",
789 .groups = typec_cable_groups,
790 .release = typec_cable_release,
791};
792
793static int cable_match(struct device *dev, void *data)
794{
795 return is_typec_cable(dev);
796}
797
798/**
799 * typec_cable_get - Get a reference to the USB Type-C cable
800 * @port: The USB Type-C Port the cable is connected to
801 *
802 * The caller must decrement the reference count with typec_cable_put() after
803 * use.
804 */
805struct typec_cable *typec_cable_get(struct typec_port *port)
806{
807 struct device *dev;
808
809 dev = device_find_child(&port->dev, NULL, cable_match);
810 if (!dev)
811 return NULL;
812
813 return to_typec_cable(dev);
814}
815EXPORT_SYMBOL_GPL(typec_cable_get);
816
817/**
818 * typec_cable_put - Decrement the reference count on USB Type-C cable
819 * @cable: The USB Type-C cable
820 */
821void typec_cable_put(struct typec_cable *cable)
822{
823 put_device(&cable->dev);
824}
825EXPORT_SYMBOL_GPL(typec_cable_put);
826
827/**
828 * typec_cable_is_active - Check is the USB Type-C cable active or passive
829 * @cable: The USB Type-C Cable
830 *
831 * Return 1 if the cable is active or 0 if it's passive.
832 */
833int typec_cable_is_active(struct typec_cable *cable)
834{
835 return cable->active;
836}
837EXPORT_SYMBOL_GPL(typec_cable_is_active);
838
839/**
840 * typec_cable_set_identity - Report result from Discover Identity command
841 * @cable: The cable updated identity values
842 *
843 * This routine is used to report that the result of Discover Identity USB power
844 * delivery command has become available.
845 */
846int typec_cable_set_identity(struct typec_cable *cable)
847{
848 if (!cable->identity)
849 return -EINVAL;
850
851 typec_report_identity(&cable->dev);
852 return 0;
853}
854EXPORT_SYMBOL_GPL(typec_cable_set_identity);
855
856/**
857 * typec_register_cable - Register a USB Type-C Cable
858 * @port: The USB Type-C Port the cable is connected to
859 * @desc: Description of the cable
860 *
861 * Registers a device for USB Type-C Cable described in @desc. The cable will be
862 * parent for the optional cable plug devises.
863 *
864 * Returns handle to the cable on success or ERR_PTR on failure.
865 */
866struct typec_cable *typec_register_cable(struct typec_port *port,
867 struct typec_cable_desc *desc)
868{
869 struct typec_cable *cable;
870 int ret;
871
872 cable = kzalloc(sizeof(*cable), GFP_KERNEL);
873 if (!cable)
874 return ERR_PTR(-ENOMEM);
875
876 cable->type = desc->type;
877 cable->active = desc->active;
878
879 if (desc->identity) {
880 /*
881 * Creating directory for the identity only if the driver is
882 * able to provide data to it.
883 */
884 cable->dev.groups = usb_pd_id_groups;
885 cable->identity = desc->identity;
886 }
887
888 cable->dev.class = typec_class;
889 cable->dev.parent = &port->dev;
890 cable->dev.type = &typec_cable_dev_type;
891 dev_set_name(&cable->dev, "%s-cable", dev_name(&port->dev));
892
893 ret = device_register(&cable->dev);
894 if (ret) {
895 dev_err(&port->dev, "failed to register cable (%d)\n", ret);
896 put_device(&cable->dev);
897 return ERR_PTR(ret);
898 }
899
900 return cable;
901}
902EXPORT_SYMBOL_GPL(typec_register_cable);
903
904/**
905 * typec_unregister_cable - Unregister a USB Type-C Cable
906 * @cable: The cable to be unregistered
907 *
908 * Unregister device created with typec_register_cable().
909 */
910void typec_unregister_cable(struct typec_cable *cable)
911{
912 if (!IS_ERR_OR_NULL(cable))
913 device_unregister(&cable->dev);
914}
915EXPORT_SYMBOL_GPL(typec_unregister_cable);
916
917/* ------------------------------------------------------------------------- */
918/* USB Type-C ports */
919
920static const char * const typec_orientations[] = {
921 [TYPEC_ORIENTATION_NONE] = "unknown",
922 [TYPEC_ORIENTATION_NORMAL] = "normal",
923 [TYPEC_ORIENTATION_REVERSE] = "reverse",
924};
925
926static const char * const typec_roles[] = {
927 [TYPEC_SINK] = "sink",
928 [TYPEC_SOURCE] = "source",
929};
930
931static const char * const typec_data_roles[] = {
932 [TYPEC_DEVICE] = "device",
933 [TYPEC_HOST] = "host",
934};
935
936static const char * const typec_port_power_roles[] = {
937 [TYPEC_PORT_SRC] = "source",
938 [TYPEC_PORT_SNK] = "sink",
939 [TYPEC_PORT_DRP] = "dual",
940};
941
942static const char * const typec_port_data_roles[] = {
943 [TYPEC_PORT_DFP] = "host",
944 [TYPEC_PORT_UFP] = "device",
945 [TYPEC_PORT_DRD] = "dual",
946};
947
948static const char * const typec_port_types_drp[] = {
949 [TYPEC_PORT_SRC] = "dual [source] sink",
950 [TYPEC_PORT_SNK] = "dual source [sink]",
951 [TYPEC_PORT_DRP] = "[dual] source sink",
952};
953
954static ssize_t
955preferred_role_store(struct device *dev, struct device_attribute *attr,
956 const char *buf, size_t size)
957{
958 struct typec_port *port = to_typec_port(dev);
959 int role;
960 int ret;
961
962 if (port->cap->type != TYPEC_PORT_DRP) {
963 dev_dbg(dev, "Preferred role only supported with DRP ports\n");
964 return -EOPNOTSUPP;
965 }
966
967 if (!port->ops || !port->ops->try_role) {
968 dev_dbg(dev, "Setting preferred role not supported\n");
969 return -EOPNOTSUPP;
970 }
971
972 role = sysfs_match_string(typec_roles, buf);
973 if (role < 0) {
974 if (sysfs_streq(buf, "none"))
975 role = TYPEC_NO_PREFERRED_ROLE;
976 else
977 return -EINVAL;
978 }
979
980 ret = port->ops->try_role(port, role);
981 if (ret)
982 return ret;
983
984 port->prefer_role = role;
985 return size;
986}
987
988static ssize_t
989preferred_role_show(struct device *dev, struct device_attribute *attr,
990 char *buf)
991{
992 struct typec_port *port = to_typec_port(dev);
993
994 if (port->cap->type != TYPEC_PORT_DRP)
995 return 0;
996
997 if (port->prefer_role < 0)
998 return 0;
999
1000 return sprintf(buf, "%s\n", typec_roles[port->prefer_role]);
1001}
1002static DEVICE_ATTR_RW(preferred_role);
1003
1004static ssize_t data_role_store(struct device *dev,
1005 struct device_attribute *attr,
1006 const char *buf, size_t size)
1007{
1008 struct typec_port *port = to_typec_port(dev);
1009 int ret;
1010
1011 if (!port->ops || !port->ops->dr_set) {
1012 dev_dbg(dev, "data role swapping not supported\n");
1013 return -EOPNOTSUPP;
1014 }
1015
1016 ret = sysfs_match_string(typec_data_roles, buf);
1017 if (ret < 0)
1018 return ret;
1019
1020 mutex_lock(&port->port_type_lock);
1021 if (port->cap->data != TYPEC_PORT_DRD) {
1022 ret = -EOPNOTSUPP;
1023 goto unlock_and_ret;
1024 }
1025
1026 ret = port->ops->dr_set(port, ret);
1027 if (ret)
1028 goto unlock_and_ret;
1029
1030 ret = size;
1031unlock_and_ret:
1032 mutex_unlock(&port->port_type_lock);
1033 return ret;
1034}
1035
1036static ssize_t data_role_show(struct device *dev,
1037 struct device_attribute *attr, char *buf)
1038{
1039 struct typec_port *port = to_typec_port(dev);
1040
1041 if (port->cap->data == TYPEC_PORT_DRD)
1042 return sprintf(buf, "%s\n", port->data_role == TYPEC_HOST ?
1043 "[host] device" : "host [device]");
1044
1045 return sprintf(buf, "[%s]\n", typec_data_roles[port->data_role]);
1046}
1047static DEVICE_ATTR_RW(data_role);
1048
1049static ssize_t power_role_store(struct device *dev,
1050 struct device_attribute *attr,
1051 const char *buf, size_t size)
1052{
1053 struct typec_port *port = to_typec_port(dev);
1054 int ret;
1055
1056 if (!port->ops || !port->ops->pr_set) {
1057 dev_dbg(dev, "power role swapping not supported\n");
1058 return -EOPNOTSUPP;
1059 }
1060
1061 if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
1062 dev_dbg(dev, "partner unable to swap power role\n");
1063 return -EIO;
1064 }
1065
1066 ret = sysfs_match_string(typec_roles, buf);
1067 if (ret < 0)
1068 return ret;
1069
1070 mutex_lock(&port->port_type_lock);
1071 if (port->port_type != TYPEC_PORT_DRP) {
1072 dev_dbg(dev, "port type fixed at \"%s\"",
1073 typec_port_power_roles[port->port_type]);
1074 ret = -EOPNOTSUPP;
1075 goto unlock_and_ret;
1076 }
1077
1078 ret = port->ops->pr_set(port, ret);
1079 if (ret)
1080 goto unlock_and_ret;
1081
1082 ret = size;
1083unlock_and_ret:
1084 mutex_unlock(&port->port_type_lock);
1085 return ret;
1086}
1087
1088static ssize_t power_role_show(struct device *dev,
1089 struct device_attribute *attr, char *buf)
1090{
1091 struct typec_port *port = to_typec_port(dev);
1092
1093 if (port->cap->type == TYPEC_PORT_DRP)
1094 return sprintf(buf, "%s\n", port->pwr_role == TYPEC_SOURCE ?
1095 "[source] sink" : "source [sink]");
1096
1097 return sprintf(buf, "[%s]\n", typec_roles[port->pwr_role]);
1098}
1099static DEVICE_ATTR_RW(power_role);
1100
1101static ssize_t
1102port_type_store(struct device *dev, struct device_attribute *attr,
1103 const char *buf, size_t size)
1104{
1105 struct typec_port *port = to_typec_port(dev);
1106 int ret;
1107 enum typec_port_type type;
1108
1109 if (port->cap->type != TYPEC_PORT_DRP ||
1110 !port->ops || !port->ops->port_type_set) {
1111 dev_dbg(dev, "changing port type not supported\n");
1112 return -EOPNOTSUPP;
1113 }
1114
1115 ret = sysfs_match_string(typec_port_power_roles, buf);
1116 if (ret < 0)
1117 return ret;
1118
1119 type = ret;
1120 mutex_lock(&port->port_type_lock);
1121
1122 if (port->port_type == type) {
1123 ret = size;
1124 goto unlock_and_ret;
1125 }
1126
1127 ret = port->ops->port_type_set(port, type);
1128 if (ret)
1129 goto unlock_and_ret;
1130
1131 port->port_type = type;
1132 ret = size;
1133
1134unlock_and_ret:
1135 mutex_unlock(&port->port_type_lock);
1136 return ret;
1137}
1138
1139static ssize_t
1140port_type_show(struct device *dev, struct device_attribute *attr,
1141 char *buf)
1142{
1143 struct typec_port *port = to_typec_port(dev);
1144
1145 if (port->cap->type == TYPEC_PORT_DRP)
1146 return sprintf(buf, "%s\n",
1147 typec_port_types_drp[port->port_type]);
1148
1149 return sprintf(buf, "[%s]\n", typec_port_power_roles[port->cap->type]);
1150}
1151static DEVICE_ATTR_RW(port_type);
1152
1153static const char * const typec_pwr_opmodes[] = {
1154 [TYPEC_PWR_MODE_USB] = "default",
1155 [TYPEC_PWR_MODE_1_5A] = "1.5A",
1156 [TYPEC_PWR_MODE_3_0A] = "3.0A",
1157 [TYPEC_PWR_MODE_PD] = "usb_power_delivery",
1158};
1159
1160static ssize_t power_operation_mode_show(struct device *dev,
1161 struct device_attribute *attr,
1162 char *buf)
1163{
1164 struct typec_port *port = to_typec_port(dev);
1165
1166 return sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]);
1167}
1168static DEVICE_ATTR_RO(power_operation_mode);
1169
1170static ssize_t vconn_source_store(struct device *dev,
1171 struct device_attribute *attr,
1172 const char *buf, size_t size)
1173{
1174 struct typec_port *port = to_typec_port(dev);
1175 bool source;
1176 int ret;
1177
1178 if (!port->cap->pd_revision) {
1179 dev_dbg(dev, "VCONN swap depends on USB Power Delivery\n");
1180 return -EOPNOTSUPP;
1181 }
1182
1183 if (!port->ops || !port->ops->vconn_set) {
1184 dev_dbg(dev, "VCONN swapping not supported\n");
1185 return -EOPNOTSUPP;
1186 }
1187
1188 ret = kstrtobool(buf, &source);
1189 if (ret)
1190 return ret;
1191
1192 ret = port->ops->vconn_set(port, (enum typec_role)source);
1193 if (ret)
1194 return ret;
1195
1196 return size;
1197}
1198
1199static ssize_t vconn_source_show(struct device *dev,
1200 struct device_attribute *attr, char *buf)
1201{
1202 struct typec_port *port = to_typec_port(dev);
1203
1204 return sprintf(buf, "%s\n",
1205 port->vconn_role == TYPEC_SOURCE ? "yes" : "no");
1206}
1207static DEVICE_ATTR_RW(vconn_source);
1208
1209static ssize_t supported_accessory_modes_show(struct device *dev,
1210 struct device_attribute *attr,
1211 char *buf)
1212{
1213 struct typec_port *port = to_typec_port(dev);
1214 ssize_t ret = 0;
1215 int i;
1216
1217 for (i = 0; i < ARRAY_SIZE(port->cap->accessory); i++) {
1218 if (port->cap->accessory[i])
1219 ret += sprintf(buf + ret, "%s ",
1220 typec_accessory_modes[port->cap->accessory[i]]);
1221 }
1222
1223 if (!ret)
1224 return sprintf(buf, "none\n");
1225
1226 buf[ret - 1] = '\n';
1227
1228 return ret;
1229}
1230static DEVICE_ATTR_RO(supported_accessory_modes);
1231
1232static ssize_t usb_typec_revision_show(struct device *dev,
1233 struct device_attribute *attr,
1234 char *buf)
1235{
1236 struct typec_port *port = to_typec_port(dev);
1237 u16 rev = port->cap->revision;
1238
1239 return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
1240}
1241static DEVICE_ATTR_RO(usb_typec_revision);
1242
1243static ssize_t usb_power_delivery_revision_show(struct device *dev,
1244 struct device_attribute *attr,
1245 char *buf)
1246{
1247 struct typec_port *p = to_typec_port(dev);
1248
1249 return sprintf(buf, "%d\n", (p->cap->pd_revision >> 8) & 0xff);
1250}
1251static DEVICE_ATTR_RO(usb_power_delivery_revision);
1252
1253static ssize_t orientation_show(struct device *dev,
1254 struct device_attribute *attr,
1255 char *buf)
1256{
1257 struct typec_port *port = to_typec_port(dev);
1258
1259 return sprintf(buf, "%s\n", typec_orientations[port->orientation]);
1260}
1261static DEVICE_ATTR_RO(orientation);
1262
1263static struct attribute *typec_attrs[] = {
1264 &dev_attr_data_role.attr,
1265 &dev_attr_power_operation_mode.attr,
1266 &dev_attr_power_role.attr,
1267 &dev_attr_preferred_role.attr,
1268 &dev_attr_supported_accessory_modes.attr,
1269 &dev_attr_usb_power_delivery_revision.attr,
1270 &dev_attr_usb_typec_revision.attr,
1271 &dev_attr_vconn_source.attr,
1272 &dev_attr_port_type.attr,
1273 &dev_attr_orientation.attr,
1274 NULL,
1275};
1276
1277static umode_t typec_attr_is_visible(struct kobject *kobj,
1278 struct attribute *attr, int n)
1279{
1280 struct typec_port *port = to_typec_port(kobj_to_dev(kobj));
1281
1282 if (attr == &dev_attr_data_role.attr) {
1283 if (port->cap->data != TYPEC_PORT_DRD ||
1284 !port->ops || !port->ops->dr_set)
1285 return 0444;
1286 } else if (attr == &dev_attr_power_role.attr) {
1287 if (port->cap->type != TYPEC_PORT_DRP ||
1288 !port->ops || !port->ops->pr_set)
1289 return 0444;
1290 } else if (attr == &dev_attr_vconn_source.attr) {
1291 if (!port->cap->pd_revision ||
1292 !port->ops || !port->ops->vconn_set)
1293 return 0444;
1294 } else if (attr == &dev_attr_preferred_role.attr) {
1295 if (port->cap->type != TYPEC_PORT_DRP ||
1296 !port->ops || !port->ops->try_role)
1297 return 0444;
1298 } else if (attr == &dev_attr_port_type.attr) {
1299 if (!port->ops || !port->ops->port_type_set)
1300 return 0;
1301 if (port->cap->type != TYPEC_PORT_DRP)
1302 return 0444;
1303 } else if (attr == &dev_attr_orientation.attr) {
1304 if (port->cap->orientation_aware)
1305 return 0444;
1306 return 0;
1307 }
1308
1309 return attr->mode;
1310}
1311
1312static struct attribute_group typec_group = {
1313 .is_visible = typec_attr_is_visible,
1314 .attrs = typec_attrs,
1315};
1316
1317static const struct attribute_group *typec_groups[] = {
1318 &typec_group,
1319 NULL
1320};
1321
1322static int typec_uevent(struct device *dev, struct kobj_uevent_env *env)
1323{
1324 int ret;
1325
1326 ret = add_uevent_var(env, "TYPEC_PORT=%s", dev_name(dev));
1327 if (ret)
1328 dev_err(dev, "failed to add uevent TYPEC_PORT\n");
1329
1330 return ret;
1331}
1332
1333static void typec_release(struct device *dev)
1334{
1335 struct typec_port *port = to_typec_port(dev);
1336
1337 ida_simple_remove(&typec_index_ida, port->id);
1338 ida_destroy(&port->mode_ids);
1339 typec_switch_put(port->sw);
1340 typec_mux_put(port->mux);
1341 kfree(port->cap);
1342 kfree(port);
1343}
1344
1345const struct device_type typec_port_dev_type = {
1346 .name = "typec_port",
1347 .groups = typec_groups,
1348 .uevent = typec_uevent,
1349 .release = typec_release,
1350};
1351
1352/* --------------------------------------- */
1353/* Driver callbacks to report role updates */
1354
1355/**
1356 * typec_set_data_role - Report data role change
1357 * @port: The USB Type-C Port where the role was changed
1358 * @role: The new data role
1359 *
1360 * This routine is used by the port drivers to report data role changes.
1361 */
1362void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
1363{
1364 if (port->data_role == role)
1365 return;
1366
1367 port->data_role = role;
1368 sysfs_notify(&port->dev.kobj, NULL, "data_role");
1369 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1370}
1371EXPORT_SYMBOL_GPL(typec_set_data_role);
1372
1373/**
1374 * typec_set_pwr_role - Report power role change
1375 * @port: The USB Type-C Port where the role was changed
1376 * @role: The new data role
1377 *
1378 * This routine is used by the port drivers to report power role changes.
1379 */
1380void typec_set_pwr_role(struct typec_port *port, enum typec_role role)
1381{
1382 if (port->pwr_role == role)
1383 return;
1384
1385 port->pwr_role = role;
1386 sysfs_notify(&port->dev.kobj, NULL, "power_role");
1387 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1388}
1389EXPORT_SYMBOL_GPL(typec_set_pwr_role);
1390
1391/**
1392 * typec_set_vconn_role - Report VCONN source change
1393 * @port: The USB Type-C Port which VCONN role changed
1394 * @role: Source when @port is sourcing VCONN, or Sink when it's not
1395 *
1396 * This routine is used by the port drivers to report if the VCONN source is
1397 * changes.
1398 */
1399void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
1400{
1401 if (port->vconn_role == role)
1402 return;
1403
1404 port->vconn_role = role;
1405 sysfs_notify(&port->dev.kobj, NULL, "vconn_source");
1406 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1407}
1408EXPORT_SYMBOL_GPL(typec_set_vconn_role);
1409
1410static int partner_match(struct device *dev, void *data)
1411{
1412 return is_typec_partner(dev);
1413}
1414
1415/**
1416 * typec_set_pwr_opmode - Report changed power operation mode
1417 * @port: The USB Type-C Port where the mode was changed
1418 * @opmode: New power operation mode
1419 *
1420 * This routine is used by the port drivers to report changed power operation
1421 * mode in @port. The modes are USB (default), 1.5A, 3.0A as defined in USB
1422 * Type-C specification, and "USB Power Delivery" when the power levels are
1423 * negotiated with methods defined in USB Power Delivery specification.
1424 */
1425void typec_set_pwr_opmode(struct typec_port *port,
1426 enum typec_pwr_opmode opmode)
1427{
1428 struct device *partner_dev;
1429
1430 if (port->pwr_opmode == opmode)
1431 return;
1432
1433 port->pwr_opmode = opmode;
1434 sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
1435 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1436
1437 partner_dev = device_find_child(&port->dev, NULL, partner_match);
1438 if (partner_dev) {
1439 struct typec_partner *partner = to_typec_partner(partner_dev);
1440
1441 if (opmode == TYPEC_PWR_MODE_PD && !partner->usb_pd) {
1442 partner->usb_pd = 1;
1443 sysfs_notify(&partner_dev->kobj, NULL,
1444 "supports_usb_power_delivery");
1445 }
1446 put_device(partner_dev);
1447 }
1448}
1449EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
1450
1451/**
1452 * typec_find_orientation - Convert orientation string to enum typec_orientation
1453 * @name: Orientation string
1454 *
1455 * This routine is used to find the typec_orientation by its string name @name.
1456 *
1457 * Returns the orientation value on success, otherwise negative error code.
1458 */
1459int typec_find_orientation(const char *name)
1460{
1461 return match_string(typec_orientations, ARRAY_SIZE(typec_orientations),
1462 name);
1463}
1464EXPORT_SYMBOL_GPL(typec_find_orientation);
1465
1466/**
1467 * typec_find_port_power_role - Get the typec port power capability
1468 * @name: port power capability string
1469 *
1470 * This routine is used to find the typec_port_type by its string name.
1471 *
1472 * Returns typec_port_type if success, otherwise negative error code.
1473 */
1474int typec_find_port_power_role(const char *name)
1475{
1476 return match_string(typec_port_power_roles,
1477 ARRAY_SIZE(typec_port_power_roles), name);
1478}
1479EXPORT_SYMBOL_GPL(typec_find_port_power_role);
1480
1481/**
1482 * typec_find_power_role - Find the typec one specific power role
1483 * @name: power role string
1484 *
1485 * This routine is used to find the typec_role by its string name.
1486 *
1487 * Returns typec_role if success, otherwise negative error code.
1488 */
1489int typec_find_power_role(const char *name)
1490{
1491 return match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
1492}
1493EXPORT_SYMBOL_GPL(typec_find_power_role);
1494
1495/**
1496 * typec_find_port_data_role - Get the typec port data capability
1497 * @name: port data capability string
1498 *
1499 * This routine is used to find the typec_port_data by its string name.
1500 *
1501 * Returns typec_port_data if success, otherwise negative error code.
1502 */
1503int typec_find_port_data_role(const char *name)
1504{
1505 return match_string(typec_port_data_roles,
1506 ARRAY_SIZE(typec_port_data_roles), name);
1507}
1508EXPORT_SYMBOL_GPL(typec_find_port_data_role);
1509
1510/* ------------------------------------------ */
1511/* API for Multiplexer/DeMultiplexer Switches */
1512
1513/**
1514 * typec_set_orientation - Set USB Type-C cable plug orientation
1515 * @port: USB Type-C Port
1516 * @orientation: USB Type-C cable plug orientation
1517 *
1518 * Set cable plug orientation for @port.
1519 */
1520int typec_set_orientation(struct typec_port *port,
1521 enum typec_orientation orientation)
1522{
1523 int ret;
1524
1525 ret = typec_switch_set(port->sw, orientation);
1526 if (ret)
1527 return ret;
1528
1529 port->orientation = orientation;
1530 sysfs_notify(&port->dev.kobj, NULL, "orientation");
1531 kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1532
1533 return 0;
1534}
1535EXPORT_SYMBOL_GPL(typec_set_orientation);
1536
1537/**
1538 * typec_get_orientation - Get USB Type-C cable plug orientation
1539 * @port: USB Type-C Port
1540 *
1541 * Get current cable plug orientation for @port.
1542 */
1543enum typec_orientation typec_get_orientation(struct typec_port *port)
1544{
1545 return port->orientation;
1546}
1547EXPORT_SYMBOL_GPL(typec_get_orientation);
1548
1549/**
1550 * typec_set_mode - Set mode of operation for USB Type-C connector
1551 * @port: USB Type-C connector
1552 * @mode: Accessory Mode, USB Operation or Safe State
1553 *
1554 * Configure @port for Accessory Mode @mode. This function will configure the
1555 * muxes needed for @mode.
1556 */
1557int typec_set_mode(struct typec_port *port, int mode)
1558{
1559 struct typec_mux_state state = { };
1560
1561 state.mode = mode;
1562
1563 return typec_mux_set(port->mux, &state);
1564}
1565EXPORT_SYMBOL_GPL(typec_set_mode);
1566
1567/* --------------------------------------- */
1568
1569/**
1570 * typec_get_drvdata - Return private driver data pointer
1571 * @port: USB Type-C port
1572 */
1573void *typec_get_drvdata(struct typec_port *port)
1574{
1575 return dev_get_drvdata(&port->dev);
1576}
1577EXPORT_SYMBOL_GPL(typec_get_drvdata);
1578
1579/**
1580 * typec_port_register_altmode - Register USB Type-C Port Alternate Mode
1581 * @port: USB Type-C Port that supports the alternate mode
1582 * @desc: Description of the alternate mode
1583 *
1584 * This routine is used to register an alternate mode that @port is capable of
1585 * supporting.
1586 *
1587 * Returns handle to the alternate mode on success or ERR_PTR on failure.
1588 */
1589struct typec_altmode *
1590typec_port_register_altmode(struct typec_port *port,
1591 const struct typec_altmode_desc *desc)
1592{
1593 struct typec_altmode *adev;
1594 struct typec_mux *mux;
1595
1596 mux = typec_mux_get(&port->dev, desc);
1597 if (IS_ERR(mux))
1598 return ERR_CAST(mux);
1599
1600 adev = typec_register_altmode(&port->dev, desc);
1601 if (IS_ERR(adev))
1602 typec_mux_put(mux);
1603 else
1604 to_altmode(adev)->mux = mux;
1605
1606 return adev;
1607}
1608EXPORT_SYMBOL_GPL(typec_port_register_altmode);
1609
1610/**
1611 * typec_register_port - Register a USB Type-C Port
1612 * @parent: Parent device
1613 * @cap: Description of the port
1614 *
1615 * Registers a device for USB Type-C Port described in @cap.
1616 *
1617 * Returns handle to the port on success or ERR_PTR on failure.
1618 */
1619struct typec_port *typec_register_port(struct device *parent,
1620 const struct typec_capability *cap)
1621{
1622 struct typec_port *port;
1623 int ret;
1624 int id;
1625
1626 port = kzalloc(sizeof(*port), GFP_KERNEL);
1627 if (!port)
1628 return ERR_PTR(-ENOMEM);
1629
1630 id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL);
1631 if (id < 0) {
1632 kfree(port);
1633 return ERR_PTR(id);
1634 }
1635
1636 switch (cap->type) {
1637 case TYPEC_PORT_SRC:
1638 port->pwr_role = TYPEC_SOURCE;
1639 port->vconn_role = TYPEC_SOURCE;
1640 break;
1641 case TYPEC_PORT_SNK:
1642 port->pwr_role = TYPEC_SINK;
1643 port->vconn_role = TYPEC_SINK;
1644 break;
1645 case TYPEC_PORT_DRP:
1646 if (cap->prefer_role != TYPEC_NO_PREFERRED_ROLE)
1647 port->pwr_role = cap->prefer_role;
1648 else
1649 port->pwr_role = TYPEC_SINK;
1650 break;
1651 }
1652
1653 switch (cap->data) {
1654 case TYPEC_PORT_DFP:
1655 port->data_role = TYPEC_HOST;
1656 break;
1657 case TYPEC_PORT_UFP:
1658 port->data_role = TYPEC_DEVICE;
1659 break;
1660 case TYPEC_PORT_DRD:
1661 if (cap->prefer_role == TYPEC_SOURCE)
1662 port->data_role = TYPEC_HOST;
1663 else
1664 port->data_role = TYPEC_DEVICE;
1665 break;
1666 }
1667
1668 ida_init(&port->mode_ids);
1669 mutex_init(&port->port_type_lock);
1670
1671 port->id = id;
1672 port->ops = cap->ops;
1673 port->port_type = cap->type;
1674 port->prefer_role = cap->prefer_role;
1675
1676 device_initialize(&port->dev);
1677 port->dev.class = typec_class;
1678 port->dev.parent = parent;
1679 port->dev.fwnode = cap->fwnode;
1680 port->dev.type = &typec_port_dev_type;
1681 dev_set_name(&port->dev, "port%d", id);
1682 dev_set_drvdata(&port->dev, cap->driver_data);
1683
1684 port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL);
1685 if (!port->cap) {
1686 put_device(&port->dev);
1687 return ERR_PTR(-ENOMEM);
1688 }
1689
1690 port->sw = typec_switch_get(&port->dev);
1691 if (IS_ERR(port->sw)) {
1692 ret = PTR_ERR(port->sw);
1693 put_device(&port->dev);
1694 return ERR_PTR(ret);
1695 }
1696
1697 port->mux = typec_mux_get(&port->dev, NULL);
1698 if (IS_ERR(port->mux)) {
1699 ret = PTR_ERR(port->mux);
1700 put_device(&port->dev);
1701 return ERR_PTR(ret);
1702 }
1703
1704 ret = device_add(&port->dev);
1705 if (ret) {
1706 dev_err(parent, "failed to register port (%d)\n", ret);
1707 put_device(&port->dev);
1708 return ERR_PTR(ret);
1709 }
1710
1711 return port;
1712}
1713EXPORT_SYMBOL_GPL(typec_register_port);
1714
1715/**
1716 * typec_unregister_port - Unregister a USB Type-C Port
1717 * @port: The port to be unregistered
1718 *
1719 * Unregister device created with typec_register_port().
1720 */
1721void typec_unregister_port(struct typec_port *port)
1722{
1723 if (!IS_ERR_OR_NULL(port))
1724 device_unregister(&port->dev);
1725}
1726EXPORT_SYMBOL_GPL(typec_unregister_port);
1727
1728static int __init typec_init(void)
1729{
1730 int ret;
1731
1732 ret = bus_register(&typec_bus);
1733 if (ret)
1734 return ret;
1735
1736 ret = class_register(&typec_mux_class);
1737 if (ret)
1738 goto err_unregister_bus;
1739
1740 typec_class = class_create(THIS_MODULE, "typec");
1741 if (IS_ERR(typec_class)) {
1742 ret = PTR_ERR(typec_class);
1743 goto err_unregister_mux_class;
1744 }
1745
1746 return 0;
1747
1748err_unregister_mux_class:
1749 class_unregister(&typec_mux_class);
1750
1751err_unregister_bus:
1752 bus_unregister(&typec_bus);
1753
1754 return ret;
1755}
1756subsys_initcall(typec_init);
1757
1758static void __exit typec_exit(void)
1759{
1760 class_destroy(typec_class);
1761 ida_destroy(&typec_index_ida);
1762 bus_unregister(&typec_bus);
1763 class_unregister(&typec_mux_class);
1764}
1765module_exit(typec_exit);
1766
1767MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
1768MODULE_LICENSE("GPL v2");
1769MODULE_DESCRIPTION("USB Type-C Connector Class");