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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");
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");