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