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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 <[email protected]>
7  */
8
9 #include <linux/module.h>
10 #include <linux/mutex.h>
11 #include <linux/property.h>
12 #include <linux/slab.h>
13 #include <linux/usb/pd_vdo.h>
14 #include <linux/usb/typec_mux.h>
15 #include <linux/usb/typec_retimer.h>
16 #include <linux/usb.h>
17
18 #include "bus.h"
19 #include "class.h"
20 #include "pd.h"
21
22 static DEFINE_IDA(typec_index_ida);
23
24 struct class typec_class = {
25         .name = "typec",
26 };
27
28 /* ------------------------------------------------------------------------- */
29 /* Common attributes */
30
31 static const char * const typec_accessory_modes[] = {
32         [TYPEC_ACCESSORY_NONE]          = "none",
33         [TYPEC_ACCESSORY_AUDIO]         = "analog_audio",
34         [TYPEC_ACCESSORY_DEBUG]         = "debug",
35 };
36
37 /* Product types defined in USB PD Specification R3.0 V2.0 */
38 static const char * const product_type_ufp[8] = {
39         [IDH_PTYPE_NOT_UFP]             = "not_ufp",
40         [IDH_PTYPE_HUB]                 = "hub",
41         [IDH_PTYPE_PERIPH]              = "peripheral",
42         [IDH_PTYPE_PSD]                 = "psd",
43         [IDH_PTYPE_AMA]                 = "ama",
44 };
45
46 static const char * const product_type_dfp[8] = {
47         [IDH_PTYPE_NOT_DFP]             = "not_dfp",
48         [IDH_PTYPE_DFP_HUB]             = "hub",
49         [IDH_PTYPE_DFP_HOST]            = "host",
50         [IDH_PTYPE_DFP_PB]              = "power_brick",
51 };
52
53 static const char * const product_type_cable[8] = {
54         [IDH_PTYPE_NOT_CABLE]           = "not_cable",
55         [IDH_PTYPE_PCABLE]              = "passive",
56         [IDH_PTYPE_ACABLE]              = "active",
57         [IDH_PTYPE_VPD]                 = "vpd",
58 };
59
60 static struct usb_pd_identity *get_pd_identity(struct device *dev)
61 {
62         if (is_typec_partner(dev)) {
63                 struct typec_partner *partner = to_typec_partner(dev);
64
65                 return partner->identity;
66         } else if (is_typec_cable(dev)) {
67                 struct typec_cable *cable = to_typec_cable(dev);
68
69                 return cable->identity;
70         }
71         return NULL;
72 }
73
74 static const char *get_pd_product_type(struct device *dev)
75 {
76         struct typec_port *port = to_typec_port(dev->parent);
77         struct usb_pd_identity *id = get_pd_identity(dev);
78         const char *ptype = NULL;
79
80         if (is_typec_partner(dev)) {
81                 if (!id)
82                         return NULL;
83
84                 if (port->data_role == TYPEC_HOST)
85                         ptype = product_type_ufp[PD_IDH_PTYPE(id->id_header)];
86                 else
87                         ptype = product_type_dfp[PD_IDH_DFP_PTYPE(id->id_header)];
88         } else if (is_typec_cable(dev)) {
89                 if (id)
90                         ptype = product_type_cable[PD_IDH_PTYPE(id->id_header)];
91                 else
92                         ptype = to_typec_cable(dev)->active ?
93                                 product_type_cable[IDH_PTYPE_ACABLE] :
94                                 product_type_cable[IDH_PTYPE_PCABLE];
95         }
96
97         return ptype;
98 }
99
100 static ssize_t id_header_show(struct device *dev, struct device_attribute *attr,
101                               char *buf)
102 {
103         struct usb_pd_identity *id = get_pd_identity(dev);
104
105         return sprintf(buf, "0x%08x\n", id->id_header);
106 }
107 static DEVICE_ATTR_RO(id_header);
108
109 static ssize_t cert_stat_show(struct device *dev, struct device_attribute *attr,
110                               char *buf)
111 {
112         struct usb_pd_identity *id = get_pd_identity(dev);
113
114         return sprintf(buf, "0x%08x\n", id->cert_stat);
115 }
116 static DEVICE_ATTR_RO(cert_stat);
117
118 static ssize_t product_show(struct device *dev, struct device_attribute *attr,
119                             char *buf)
120 {
121         struct usb_pd_identity *id = get_pd_identity(dev);
122
123         return sprintf(buf, "0x%08x\n", id->product);
124 }
125 static DEVICE_ATTR_RO(product);
126
127 static ssize_t product_type_vdo1_show(struct device *dev, struct device_attribute *attr,
128                                       char *buf)
129 {
130         struct usb_pd_identity *id = get_pd_identity(dev);
131
132         return sysfs_emit(buf, "0x%08x\n", id->vdo[0]);
133 }
134 static DEVICE_ATTR_RO(product_type_vdo1);
135
136 static ssize_t product_type_vdo2_show(struct device *dev, struct device_attribute *attr,
137                                       char *buf)
138 {
139         struct usb_pd_identity *id = get_pd_identity(dev);
140
141         return sysfs_emit(buf, "0x%08x\n", id->vdo[1]);
142 }
143 static DEVICE_ATTR_RO(product_type_vdo2);
144
145 static ssize_t product_type_vdo3_show(struct device *dev, struct device_attribute *attr,
146                                       char *buf)
147 {
148         struct usb_pd_identity *id = get_pd_identity(dev);
149
150         return sysfs_emit(buf, "0x%08x\n", id->vdo[2]);
151 }
152 static DEVICE_ATTR_RO(product_type_vdo3);
153
154 static struct attribute *usb_pd_id_attrs[] = {
155         &dev_attr_id_header.attr,
156         &dev_attr_cert_stat.attr,
157         &dev_attr_product.attr,
158         &dev_attr_product_type_vdo1.attr,
159         &dev_attr_product_type_vdo2.attr,
160         &dev_attr_product_type_vdo3.attr,
161         NULL
162 };
163
164 static const struct attribute_group usb_pd_id_group = {
165         .name = "identity",
166         .attrs = usb_pd_id_attrs,
167 };
168
169 static const struct attribute_group *usb_pd_id_groups[] = {
170         &usb_pd_id_group,
171         NULL,
172 };
173
174 static void typec_product_type_notify(struct device *dev)
175 {
176         char *envp[2] = { };
177         const char *ptype;
178
179         ptype = get_pd_product_type(dev);
180         if (!ptype)
181                 return;
182
183         sysfs_notify(&dev->kobj, NULL, "type");
184
185         envp[0] = kasprintf(GFP_KERNEL, "PRODUCT_TYPE=%s", ptype);
186         if (!envp[0])
187                 return;
188
189         kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
190         kfree(envp[0]);
191 }
192
193 static void typec_report_identity(struct device *dev)
194 {
195         sysfs_notify(&dev->kobj, "identity", "id_header");
196         sysfs_notify(&dev->kobj, "identity", "cert_stat");
197         sysfs_notify(&dev->kobj, "identity", "product");
198         sysfs_notify(&dev->kobj, "identity", "product_type_vdo1");
199         sysfs_notify(&dev->kobj, "identity", "product_type_vdo2");
200         sysfs_notify(&dev->kobj, "identity", "product_type_vdo3");
201         typec_product_type_notify(dev);
202 }
203
204 static ssize_t
205 type_show(struct device *dev, struct device_attribute *attr, char *buf)
206 {
207         const char *ptype;
208
209         ptype = get_pd_product_type(dev);
210         if (!ptype)
211                 return 0;
212
213         return sysfs_emit(buf, "%s\n", ptype);
214 }
215 static DEVICE_ATTR_RO(type);
216
217 static ssize_t usb_power_delivery_revision_show(struct device *dev,
218                                                 struct device_attribute *attr,
219                                                 char *buf);
220 static DEVICE_ATTR_RO(usb_power_delivery_revision);
221
222 /* ------------------------------------------------------------------------- */
223 /* Alternate Modes */
224
225 static int altmode_match(struct device *dev, void *data)
226 {
227         struct typec_altmode *adev = to_typec_altmode(dev);
228         struct typec_device_id *id = data;
229
230         if (!is_typec_altmode(dev))
231                 return 0;
232
233         return ((adev->svid == id->svid) && (adev->mode == id->mode));
234 }
235
236 static void typec_altmode_set_partner(struct altmode *altmode)
237 {
238         struct typec_altmode *adev = &altmode->adev;
239         struct typec_device_id id = { adev->svid, adev->mode, };
240         struct typec_port *port = typec_altmode2port(adev);
241         struct altmode *partner;
242         struct device *dev;
243
244         dev = device_find_child(&port->dev, &id, altmode_match);
245         if (!dev)
246                 return;
247
248         /* Bind the port alt mode to the partner/plug alt mode. */
249         partner = to_altmode(to_typec_altmode(dev));
250         altmode->partner = partner;
251
252         /* Bind the partner/plug alt mode to the port alt mode. */
253         if (is_typec_plug(adev->dev.parent)) {
254                 struct typec_plug *plug = to_typec_plug(adev->dev.parent);
255
256                 partner->plug[plug->index] = altmode;
257         } else {
258                 partner->partner = altmode;
259         }
260 }
261
262 static void typec_altmode_put_partner(struct altmode *altmode)
263 {
264         struct altmode *partner = altmode->partner;
265         struct typec_altmode *adev;
266
267         if (!partner)
268                 return;
269
270         adev = &altmode->adev;
271
272         if (is_typec_plug(adev->dev.parent)) {
273                 struct typec_plug *plug = to_typec_plug(adev->dev.parent);
274
275                 partner->plug[plug->index] = NULL;
276         } else {
277                 partner->partner = NULL;
278         }
279         put_device(&adev->dev);
280 }
281
282 /**
283  * typec_altmode_update_active - Report Enter/Exit mode
284  * @adev: Handle to the alternate mode
285  * @active: True when the mode has been entered
286  *
287  * If a partner or cable plug executes Enter/Exit Mode command successfully, the
288  * drivers use this routine to report the updated state of the mode.
289  */
290 void typec_altmode_update_active(struct typec_altmode *adev, bool active)
291 {
292         char dir[6];
293
294         if (adev->active == active)
295                 return;
296
297         if (!is_typec_port(adev->dev.parent) && adev->dev.driver) {
298                 if (!active)
299                         module_put(adev->dev.driver->owner);
300                 else
301                         WARN_ON(!try_module_get(adev->dev.driver->owner));
302         }
303
304         adev->active = active;
305         snprintf(dir, sizeof(dir), "mode%d", adev->mode);
306         sysfs_notify(&adev->dev.kobj, dir, "active");
307         sysfs_notify(&adev->dev.kobj, NULL, "active");
308         kobject_uevent(&adev->dev.kobj, KOBJ_CHANGE);
309 }
310 EXPORT_SYMBOL_GPL(typec_altmode_update_active);
311
312 /**
313  * typec_altmode2port - Alternate Mode to USB Type-C port
314  * @alt: The Alternate Mode
315  *
316  * Returns handle to the port that a cable plug or partner with @alt is
317  * connected to.
318  */
319 struct typec_port *typec_altmode2port(struct typec_altmode *alt)
320 {
321         if (is_typec_plug(alt->dev.parent))
322                 return to_typec_port(alt->dev.parent->parent->parent);
323         if (is_typec_partner(alt->dev.parent))
324                 return to_typec_port(alt->dev.parent->parent);
325         if (is_typec_port(alt->dev.parent))
326                 return to_typec_port(alt->dev.parent);
327
328         return NULL;
329 }
330 EXPORT_SYMBOL_GPL(typec_altmode2port);
331
332 static ssize_t
333 vdo_show(struct device *dev, struct device_attribute *attr, char *buf)
334 {
335         struct typec_altmode *alt = to_typec_altmode(dev);
336
337         return sprintf(buf, "0x%08x\n", alt->vdo);
338 }
339 static DEVICE_ATTR_RO(vdo);
340
341 static ssize_t
342 description_show(struct device *dev, struct device_attribute *attr, char *buf)
343 {
344         struct typec_altmode *alt = to_typec_altmode(dev);
345
346         return sprintf(buf, "%s\n", alt->desc ? alt->desc : "");
347 }
348 static DEVICE_ATTR_RO(description);
349
350 static ssize_t
351 active_show(struct device *dev, struct device_attribute *attr, char *buf)
352 {
353         struct typec_altmode *alt = to_typec_altmode(dev);
354
355         return sprintf(buf, "%s\n", alt->active ? "yes" : "no");
356 }
357
358 static ssize_t active_store(struct device *dev, struct device_attribute *attr,
359                             const char *buf, size_t size)
360 {
361         struct typec_altmode *adev = to_typec_altmode(dev);
362         struct altmode *altmode = to_altmode(adev);
363         bool enter;
364         int ret;
365
366         ret = kstrtobool(buf, &enter);
367         if (ret)
368                 return ret;
369
370         if (adev->active == enter)
371                 return size;
372
373         if (is_typec_port(adev->dev.parent)) {
374                 typec_altmode_update_active(adev, enter);
375
376                 /* Make sure that the partner exits the mode before disabling */
377                 if (altmode->partner && !enter && altmode->partner->adev.active)
378                         typec_altmode_exit(&altmode->partner->adev);
379         } else if (altmode->partner) {
380                 if (enter && !altmode->partner->adev.active) {
381                         dev_warn(dev, "port has the mode disabled\n");
382                         return -EPERM;
383                 }
384         }
385
386         /* Note: If there is no driver, the mode will not be entered */
387         if (adev->ops && adev->ops->activate) {
388                 ret = adev->ops->activate(adev, enter);
389                 if (ret)
390                         return ret;
391         }
392
393         return size;
394 }
395 static DEVICE_ATTR_RW(active);
396
397 static ssize_t
398 supported_roles_show(struct device *dev, struct device_attribute *attr,
399                      char *buf)
400 {
401         struct altmode *alt = to_altmode(to_typec_altmode(dev));
402         ssize_t ret;
403
404         switch (alt->roles) {
405         case TYPEC_PORT_SRC:
406                 ret = sprintf(buf, "source\n");
407                 break;
408         case TYPEC_PORT_SNK:
409                 ret = sprintf(buf, "sink\n");
410                 break;
411         case TYPEC_PORT_DRP:
412         default:
413                 ret = sprintf(buf, "source sink\n");
414                 break;
415         }
416         return ret;
417 }
418 static DEVICE_ATTR_RO(supported_roles);
419
420 static ssize_t
421 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
422 {
423         struct typec_altmode *adev = to_typec_altmode(dev);
424
425         return sprintf(buf, "%u\n", adev->mode);
426 }
427 static DEVICE_ATTR_RO(mode);
428
429 static ssize_t
430 svid_show(struct device *dev, struct device_attribute *attr, char *buf)
431 {
432         struct typec_altmode *adev = to_typec_altmode(dev);
433
434         return sprintf(buf, "%04x\n", adev->svid);
435 }
436 static DEVICE_ATTR_RO(svid);
437
438 static struct attribute *typec_altmode_attrs[] = {
439         &dev_attr_active.attr,
440         &dev_attr_mode.attr,
441         &dev_attr_svid.attr,
442         &dev_attr_vdo.attr,
443         NULL
444 };
445
446 static umode_t typec_altmode_attr_is_visible(struct kobject *kobj,
447                                              struct attribute *attr, int n)
448 {
449         struct typec_altmode *adev = to_typec_altmode(kobj_to_dev(kobj));
450
451         if (attr == &dev_attr_active.attr)
452                 if (!adev->ops || !adev->ops->activate)
453                         return 0444;
454
455         return attr->mode;
456 }
457
458 static const struct attribute_group typec_altmode_group = {
459         .is_visible = typec_altmode_attr_is_visible,
460         .attrs = typec_altmode_attrs,
461 };
462
463 static const struct attribute_group *typec_altmode_groups[] = {
464         &typec_altmode_group,
465         NULL
466 };
467
468 static int altmode_id_get(struct device *dev)
469 {
470         struct ida *ids;
471
472         if (is_typec_partner(dev))
473                 ids = &to_typec_partner(dev)->mode_ids;
474         else if (is_typec_plug(dev))
475                 ids = &to_typec_plug(dev)->mode_ids;
476         else
477                 ids = &to_typec_port(dev)->mode_ids;
478
479         return ida_simple_get(ids, 0, 0, GFP_KERNEL);
480 }
481
482 static void altmode_id_remove(struct device *dev, int id)
483 {
484         struct ida *ids;
485
486         if (is_typec_partner(dev))
487                 ids = &to_typec_partner(dev)->mode_ids;
488         else if (is_typec_plug(dev))
489                 ids = &to_typec_plug(dev)->mode_ids;
490         else
491                 ids = &to_typec_port(dev)->mode_ids;
492
493         ida_simple_remove(ids, id);
494 }
495
496 static void typec_altmode_release(struct device *dev)
497 {
498         struct altmode *alt = to_altmode(to_typec_altmode(dev));
499
500         if (!is_typec_port(dev->parent))
501                 typec_altmode_put_partner(alt);
502
503         altmode_id_remove(alt->adev.dev.parent, alt->id);
504         kfree(alt);
505 }
506
507 const struct device_type typec_altmode_dev_type = {
508         .name = "typec_alternate_mode",
509         .groups = typec_altmode_groups,
510         .release = typec_altmode_release,
511 };
512
513 static struct typec_altmode *
514 typec_register_altmode(struct device *parent,
515                        const struct typec_altmode_desc *desc)
516 {
517         unsigned int id = altmode_id_get(parent);
518         bool is_port = is_typec_port(parent);
519         struct altmode *alt;
520         int ret;
521
522         alt = kzalloc(sizeof(*alt), GFP_KERNEL);
523         if (!alt) {
524                 altmode_id_remove(parent, id);
525                 return ERR_PTR(-ENOMEM);
526         }
527
528         alt->adev.svid = desc->svid;
529         alt->adev.mode = desc->mode;
530         alt->adev.vdo = desc->vdo;
531         alt->roles = desc->roles;
532         alt->id = id;
533
534         alt->attrs[0] = &dev_attr_vdo.attr;
535         alt->attrs[1] = &dev_attr_description.attr;
536         alt->attrs[2] = &dev_attr_active.attr;
537
538         if (is_port) {
539                 alt->attrs[3] = &dev_attr_supported_roles.attr;
540                 alt->adev.active = true; /* Enabled by default */
541         }
542
543         sprintf(alt->group_name, "mode%d", desc->mode);
544         alt->group.name = alt->group_name;
545         alt->group.attrs = alt->attrs;
546         alt->groups[0] = &alt->group;
547
548         alt->adev.dev.parent = parent;
549         alt->adev.dev.groups = alt->groups;
550         alt->adev.dev.type = &typec_altmode_dev_type;
551         dev_set_name(&alt->adev.dev, "%s.%u", dev_name(parent), id);
552
553         /* Link partners and plugs with the ports */
554         if (!is_port)
555                 typec_altmode_set_partner(alt);
556
557         /* The partners are bind to drivers */
558         if (is_typec_partner(parent))
559                 alt->adev.dev.bus = &typec_bus;
560
561         /* Plug alt modes need a class to generate udev events. */
562         if (is_typec_plug(parent))
563                 alt->adev.dev.class = &typec_class;
564
565         ret = device_register(&alt->adev.dev);
566         if (ret) {
567                 dev_err(parent, "failed to register alternate mode (%d)\n",
568                         ret);
569                 put_device(&alt->adev.dev);
570                 return ERR_PTR(ret);
571         }
572
573         return &alt->adev;
574 }
575
576 /**
577  * typec_unregister_altmode - Unregister Alternate Mode
578  * @adev: The alternate mode to be unregistered
579  *
580  * Unregister device created with typec_partner_register_altmode(),
581  * typec_plug_register_altmode() or typec_port_register_altmode().
582  */
583 void typec_unregister_altmode(struct typec_altmode *adev)
584 {
585         if (IS_ERR_OR_NULL(adev))
586                 return;
587         typec_retimer_put(to_altmode(adev)->retimer);
588         typec_mux_put(to_altmode(adev)->mux);
589         device_unregister(&adev->dev);
590 }
591 EXPORT_SYMBOL_GPL(typec_unregister_altmode);
592
593 /* ------------------------------------------------------------------------- */
594 /* Type-C Partners */
595
596 static ssize_t accessory_mode_show(struct device *dev,
597                                    struct device_attribute *attr,
598                                    char *buf)
599 {
600         struct typec_partner *p = to_typec_partner(dev);
601
602         return sprintf(buf, "%s\n", typec_accessory_modes[p->accessory]);
603 }
604 static DEVICE_ATTR_RO(accessory_mode);
605
606 static ssize_t supports_usb_power_delivery_show(struct device *dev,
607                                                 struct device_attribute *attr,
608                                                 char *buf)
609 {
610         struct typec_partner *p = to_typec_partner(dev);
611
612         return sprintf(buf, "%s\n", p->usb_pd ? "yes" : "no");
613 }
614 static DEVICE_ATTR_RO(supports_usb_power_delivery);
615
616 static ssize_t number_of_alternate_modes_show(struct device *dev, struct device_attribute *attr,
617                                               char *buf)
618 {
619         struct typec_partner *partner;
620         struct typec_plug *plug;
621         int num_altmodes;
622
623         if (is_typec_partner(dev)) {
624                 partner = to_typec_partner(dev);
625                 num_altmodes = partner->num_altmodes;
626         } else if (is_typec_plug(dev)) {
627                 plug = to_typec_plug(dev);
628                 num_altmodes = plug->num_altmodes;
629         } else {
630                 return 0;
631         }
632
633         return sysfs_emit(buf, "%d\n", num_altmodes);
634 }
635 static DEVICE_ATTR_RO(number_of_alternate_modes);
636
637 static struct attribute *typec_partner_attrs[] = {
638         &dev_attr_accessory_mode.attr,
639         &dev_attr_supports_usb_power_delivery.attr,
640         &dev_attr_number_of_alternate_modes.attr,
641         &dev_attr_type.attr,
642         &dev_attr_usb_power_delivery_revision.attr,
643         NULL
644 };
645
646 static umode_t typec_partner_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
647 {
648         struct typec_partner *partner = to_typec_partner(kobj_to_dev(kobj));
649
650         if (attr == &dev_attr_number_of_alternate_modes.attr) {
651                 if (partner->num_altmodes < 0)
652                         return 0;
653         }
654
655         if (attr == &dev_attr_type.attr)
656                 if (!get_pd_product_type(kobj_to_dev(kobj)))
657                         return 0;
658
659         return attr->mode;
660 }
661
662 static const struct attribute_group typec_partner_group = {
663         .is_visible = typec_partner_attr_is_visible,
664         .attrs = typec_partner_attrs
665 };
666
667 static const struct attribute_group *typec_partner_groups[] = {
668         &typec_partner_group,
669         NULL
670 };
671
672 static void typec_partner_release(struct device *dev)
673 {
674         struct typec_partner *partner = to_typec_partner(dev);
675
676         ida_destroy(&partner->mode_ids);
677         kfree(partner);
678 }
679
680 const struct device_type typec_partner_dev_type = {
681         .name = "typec_partner",
682         .groups = typec_partner_groups,
683         .release = typec_partner_release,
684 };
685
686 static void typec_partner_link_device(struct typec_partner *partner, struct device *dev)
687 {
688         int ret;
689
690         ret = sysfs_create_link(&dev->kobj, &partner->dev.kobj, "typec");
691         if (ret)
692                 return;
693
694         ret = sysfs_create_link(&partner->dev.kobj, &dev->kobj, dev_name(dev));
695         if (ret) {
696                 sysfs_remove_link(&dev->kobj, "typec");
697                 return;
698         }
699
700         if (partner->attach)
701                 partner->attach(partner, dev);
702 }
703
704 static void typec_partner_unlink_device(struct typec_partner *partner, struct device *dev)
705 {
706         sysfs_remove_link(&partner->dev.kobj, dev_name(dev));
707         sysfs_remove_link(&dev->kobj, "typec");
708
709         if (partner->deattach)
710                 partner->deattach(partner, dev);
711 }
712
713 /**
714  * typec_partner_set_identity - Report result from Discover Identity command
715  * @partner: The partner updated identity values
716  *
717  * This routine is used to report that the result of Discover Identity USB power
718  * delivery command has become available.
719  */
720 int typec_partner_set_identity(struct typec_partner *partner)
721 {
722         if (!partner->identity)
723                 return -EINVAL;
724
725         typec_report_identity(&partner->dev);
726         return 0;
727 }
728 EXPORT_SYMBOL_GPL(typec_partner_set_identity);
729
730 /**
731  * typec_partner_set_pd_revision - Set the PD revision supported by the partner
732  * @partner: The partner to be updated.
733  * @pd_revision:  USB Power Delivery Specification Revision supported by partner
734  *
735  * This routine is used to report that the PD revision of the port partner has
736  * become available.
737  */
738 void typec_partner_set_pd_revision(struct typec_partner *partner, u16 pd_revision)
739 {
740         if (partner->pd_revision == pd_revision)
741                 return;
742
743         partner->pd_revision = pd_revision;
744         sysfs_notify(&partner->dev.kobj, NULL, "usb_power_delivery_revision");
745         if (pd_revision != 0 && !partner->usb_pd) {
746                 partner->usb_pd = 1;
747                 sysfs_notify(&partner->dev.kobj, NULL,
748                              "supports_usb_power_delivery");
749         }
750         kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
751 }
752 EXPORT_SYMBOL_GPL(typec_partner_set_pd_revision);
753
754 /**
755  * typec_partner_set_usb_power_delivery - Declare USB Power Delivery Contract.
756  * @partner: The partner device.
757  * @pd: The USB PD instance.
758  *
759  * This routine can be used to declare USB Power Delivery Contract with @partner
760  * by linking @partner to @pd which contains the objects that were used during the
761  * negotiation of the contract.
762  *
763  * If @pd is NULL, the link is removed and the contract with @partner has ended.
764  */
765 int typec_partner_set_usb_power_delivery(struct typec_partner *partner,
766                                          struct usb_power_delivery *pd)
767 {
768         int ret;
769
770         if (IS_ERR_OR_NULL(partner) || partner->pd == pd)
771                 return 0;
772
773         if (pd) {
774                 ret = usb_power_delivery_link_device(pd, &partner->dev);
775                 if (ret)
776                         return ret;
777         } else {
778                 usb_power_delivery_unlink_device(partner->pd, &partner->dev);
779         }
780
781         partner->pd = pd;
782
783         return 0;
784 }
785 EXPORT_SYMBOL_GPL(typec_partner_set_usb_power_delivery);
786
787 /**
788  * typec_partner_set_num_altmodes - Set the number of available partner altmodes
789  * @partner: The partner to be updated.
790  * @num_altmodes: The number of altmodes we want to specify as available.
791  *
792  * This routine is used to report the number of alternate modes supported by the
793  * partner. This value is *not* enforced in alternate mode registration routines.
794  *
795  * @partner.num_altmodes is set to -1 on partner registration, denoting that
796  * a valid value has not been set for it yet.
797  *
798  * Returns 0 on success or negative error number on failure.
799  */
800 int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes)
801 {
802         int ret;
803
804         if (num_altmodes < 0)
805                 return -EINVAL;
806
807         partner->num_altmodes = num_altmodes;
808         ret = sysfs_update_group(&partner->dev.kobj, &typec_partner_group);
809         if (ret < 0)
810                 return ret;
811
812         sysfs_notify(&partner->dev.kobj, NULL, "number_of_alternate_modes");
813         kobject_uevent(&partner->dev.kobj, KOBJ_CHANGE);
814
815         return 0;
816 }
817 EXPORT_SYMBOL_GPL(typec_partner_set_num_altmodes);
818
819 /**
820  * typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode
821  * @partner: USB Type-C Partner that supports the alternate mode
822  * @desc: Description of the alternate mode
823  *
824  * This routine is used to register each alternate mode individually that
825  * @partner has listed in response to Discover SVIDs command. The modes for a
826  * SVID listed in response to Discover Modes command need to be listed in an
827  * array in @desc.
828  *
829  * Returns handle to the alternate mode on success or ERR_PTR on failure.
830  */
831 struct typec_altmode *
832 typec_partner_register_altmode(struct typec_partner *partner,
833                                const struct typec_altmode_desc *desc)
834 {
835         return typec_register_altmode(&partner->dev, desc);
836 }
837 EXPORT_SYMBOL_GPL(typec_partner_register_altmode);
838
839 /**
840  * typec_partner_set_svdm_version - Set negotiated Structured VDM (SVDM) Version
841  * @partner: USB Type-C Partner that supports SVDM
842  * @svdm_version: Negotiated SVDM Version
843  *
844  * This routine is used to save the negotiated SVDM Version.
845  */
846 void typec_partner_set_svdm_version(struct typec_partner *partner,
847                                    enum usb_pd_svdm_ver svdm_version)
848 {
849         partner->svdm_version = svdm_version;
850 }
851 EXPORT_SYMBOL_GPL(typec_partner_set_svdm_version);
852
853 /**
854  * typec_partner_usb_power_delivery_register - Register Type-C partner USB Power Delivery Support
855  * @partner: Type-C partner device.
856  * @desc: Description of the USB PD contract.
857  *
858  * This routine is a wrapper around usb_power_delivery_register(). It registers
859  * USB Power Delivery Capabilities for a Type-C partner device. Specifically,
860  * it sets the Type-C partner device as a parent for the resulting USB Power Delivery object.
861  *
862  * Returns handle to struct usb_power_delivery or ERR_PTR.
863  */
864 struct usb_power_delivery *
865 typec_partner_usb_power_delivery_register(struct typec_partner *partner,
866                                           struct usb_power_delivery_desc *desc)
867 {
868         return usb_power_delivery_register(&partner->dev, desc);
869 }
870 EXPORT_SYMBOL_GPL(typec_partner_usb_power_delivery_register);
871
872 /**
873  * typec_register_partner - Register a USB Type-C Partner
874  * @port: The USB Type-C Port the partner is connected to
875  * @desc: Description of the partner
876  *
877  * Registers a device for USB Type-C Partner described in @desc.
878  *
879  * Returns handle to the partner on success or ERR_PTR on failure.
880  */
881 struct typec_partner *typec_register_partner(struct typec_port *port,
882                                              struct typec_partner_desc *desc)
883 {
884         struct typec_partner *partner;
885         int ret;
886
887         partner = kzalloc(sizeof(*partner), GFP_KERNEL);
888         if (!partner)
889                 return ERR_PTR(-ENOMEM);
890
891         ida_init(&partner->mode_ids);
892         partner->usb_pd = desc->usb_pd;
893         partner->accessory = desc->accessory;
894         partner->num_altmodes = -1;
895         partner->pd_revision = desc->pd_revision;
896         partner->svdm_version = port->cap->svdm_version;
897         partner->attach = desc->attach;
898         partner->deattach = desc->deattach;
899
900         if (desc->identity) {
901                 /*
902                  * Creating directory for the identity only if the driver is
903                  * able to provide data to it.
904                  */
905                 partner->dev.groups = usb_pd_id_groups;
906                 partner->identity = desc->identity;
907         }
908
909         partner->dev.class = &typec_class;
910         partner->dev.parent = &port->dev;
911         partner->dev.type = &typec_partner_dev_type;
912         dev_set_name(&partner->dev, "%s-partner", dev_name(&port->dev));
913
914         ret = device_register(&partner->dev);
915         if (ret) {
916                 dev_err(&port->dev, "failed to register partner (%d)\n", ret);
917                 put_device(&partner->dev);
918                 return ERR_PTR(ret);
919         }
920
921         if (port->usb2_dev)
922                 typec_partner_link_device(partner, port->usb2_dev);
923         if (port->usb3_dev)
924                 typec_partner_link_device(partner, port->usb3_dev);
925
926         return partner;
927 }
928 EXPORT_SYMBOL_GPL(typec_register_partner);
929
930 /**
931  * typec_unregister_partner - Unregister a USB Type-C Partner
932  * @partner: The partner to be unregistered
933  *
934  * Unregister device created with typec_register_partner().
935  */
936 void typec_unregister_partner(struct typec_partner *partner)
937 {
938         struct typec_port *port;
939
940         if (IS_ERR_OR_NULL(partner))
941                 return;
942
943         port = to_typec_port(partner->dev.parent);
944
945         if (port->usb2_dev)
946                 typec_partner_unlink_device(partner, port->usb2_dev);
947         if (port->usb3_dev)
948                 typec_partner_unlink_device(partner, port->usb3_dev);
949
950         device_unregister(&partner->dev);
951 }
952 EXPORT_SYMBOL_GPL(typec_unregister_partner);
953
954 /* ------------------------------------------------------------------------- */
955 /* Type-C Cable Plugs */
956
957 static void typec_plug_release(struct device *dev)
958 {
959         struct typec_plug *plug = to_typec_plug(dev);
960
961         ida_destroy(&plug->mode_ids);
962         kfree(plug);
963 }
964
965 static struct attribute *typec_plug_attrs[] = {
966         &dev_attr_number_of_alternate_modes.attr,
967         NULL
968 };
969
970 static umode_t typec_plug_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
971 {
972         struct typec_plug *plug = to_typec_plug(kobj_to_dev(kobj));
973
974         if (attr == &dev_attr_number_of_alternate_modes.attr) {
975                 if (plug->num_altmodes < 0)
976                         return 0;
977         }
978
979         return attr->mode;
980 }
981
982 static const struct attribute_group typec_plug_group = {
983         .is_visible = typec_plug_attr_is_visible,
984         .attrs = typec_plug_attrs
985 };
986
987 static const struct attribute_group *typec_plug_groups[] = {
988         &typec_plug_group,
989         NULL
990 };
991
992 const struct device_type typec_plug_dev_type = {
993         .name = "typec_plug",
994         .groups = typec_plug_groups,
995         .release = typec_plug_release,
996 };
997
998 /**
999  * typec_plug_set_num_altmodes - Set the number of available plug altmodes
1000  * @plug: The plug to be updated.
1001  * @num_altmodes: The number of altmodes we want to specify as available.
1002  *
1003  * This routine is used to report the number of alternate modes supported by the
1004  * plug. This value is *not* enforced in alternate mode registration routines.
1005  *
1006  * @plug.num_altmodes is set to -1 on plug registration, denoting that
1007  * a valid value has not been set for it yet.
1008  *
1009  * Returns 0 on success or negative error number on failure.
1010  */
1011 int typec_plug_set_num_altmodes(struct typec_plug *plug, int num_altmodes)
1012 {
1013         int ret;
1014
1015         if (num_altmodes < 0)
1016                 return -EINVAL;
1017
1018         plug->num_altmodes = num_altmodes;
1019         ret = sysfs_update_group(&plug->dev.kobj, &typec_plug_group);
1020         if (ret < 0)
1021                 return ret;
1022
1023         sysfs_notify(&plug->dev.kobj, NULL, "number_of_alternate_modes");
1024         kobject_uevent(&plug->dev.kobj, KOBJ_CHANGE);
1025
1026         return 0;
1027 }
1028 EXPORT_SYMBOL_GPL(typec_plug_set_num_altmodes);
1029
1030 /**
1031  * typec_plug_register_altmode - Register USB Type-C Cable Plug Alternate Mode
1032  * @plug: USB Type-C Cable Plug that supports the alternate mode
1033  * @desc: Description of the alternate mode
1034  *
1035  * This routine is used to register each alternate mode individually that @plug
1036  * has listed in response to Discover SVIDs command. The modes for a SVID that
1037  * the plug lists in response to Discover Modes command need to be listed in an
1038  * array in @desc.
1039  *
1040  * Returns handle to the alternate mode on success or ERR_PTR on failure.
1041  */
1042 struct typec_altmode *
1043 typec_plug_register_altmode(struct typec_plug *plug,
1044                             const struct typec_altmode_desc *desc)
1045 {
1046         return typec_register_altmode(&plug->dev, desc);
1047 }
1048 EXPORT_SYMBOL_GPL(typec_plug_register_altmode);
1049
1050 /**
1051  * typec_register_plug - Register a USB Type-C Cable Plug
1052  * @cable: USB Type-C Cable with the plug
1053  * @desc: Description of the cable plug
1054  *
1055  * Registers a device for USB Type-C Cable Plug described in @desc. A USB Type-C
1056  * Cable Plug represents a plug with electronics in it that can response to USB
1057  * Power Delivery SOP Prime or SOP Double Prime packages.
1058  *
1059  * Returns handle to the cable plug on success or ERR_PTR on failure.
1060  */
1061 struct typec_plug *typec_register_plug(struct typec_cable *cable,
1062                                        struct typec_plug_desc *desc)
1063 {
1064         struct typec_plug *plug;
1065         char name[8];
1066         int ret;
1067
1068         plug = kzalloc(sizeof(*plug), GFP_KERNEL);
1069         if (!plug)
1070                 return ERR_PTR(-ENOMEM);
1071
1072         sprintf(name, "plug%d", desc->index);
1073
1074         ida_init(&plug->mode_ids);
1075         plug->num_altmodes = -1;
1076         plug->index = desc->index;
1077         plug->dev.class = &typec_class;
1078         plug->dev.parent = &cable->dev;
1079         plug->dev.type = &typec_plug_dev_type;
1080         dev_set_name(&plug->dev, "%s-%s", dev_name(cable->dev.parent), name);
1081
1082         ret = device_register(&plug->dev);
1083         if (ret) {
1084                 dev_err(&cable->dev, "failed to register plug (%d)\n", ret);
1085                 put_device(&plug->dev);
1086                 return ERR_PTR(ret);
1087         }
1088
1089         return plug;
1090 }
1091 EXPORT_SYMBOL_GPL(typec_register_plug);
1092
1093 /**
1094  * typec_unregister_plug - Unregister a USB Type-C Cable Plug
1095  * @plug: The cable plug to be unregistered
1096  *
1097  * Unregister device created with typec_register_plug().
1098  */
1099 void typec_unregister_plug(struct typec_plug *plug)
1100 {
1101         if (!IS_ERR_OR_NULL(plug))
1102                 device_unregister(&plug->dev);
1103 }
1104 EXPORT_SYMBOL_GPL(typec_unregister_plug);
1105
1106 /* Type-C Cables */
1107
1108 static const char * const typec_plug_types[] = {
1109         [USB_PLUG_NONE]         = "unknown",
1110         [USB_PLUG_TYPE_A]       = "type-a",
1111         [USB_PLUG_TYPE_B]       = "type-b",
1112         [USB_PLUG_TYPE_C]       = "type-c",
1113         [USB_PLUG_CAPTIVE]      = "captive",
1114 };
1115
1116 static ssize_t plug_type_show(struct device *dev,
1117                               struct device_attribute *attr, char *buf)
1118 {
1119         struct typec_cable *cable = to_typec_cable(dev);
1120
1121         return sprintf(buf, "%s\n", typec_plug_types[cable->type]);
1122 }
1123 static DEVICE_ATTR_RO(plug_type);
1124
1125 static struct attribute *typec_cable_attrs[] = {
1126         &dev_attr_type.attr,
1127         &dev_attr_plug_type.attr,
1128         &dev_attr_usb_power_delivery_revision.attr,
1129         NULL
1130 };
1131 ATTRIBUTE_GROUPS(typec_cable);
1132
1133 static void typec_cable_release(struct device *dev)
1134 {
1135         struct typec_cable *cable = to_typec_cable(dev);
1136
1137         kfree(cable);
1138 }
1139
1140 const struct device_type typec_cable_dev_type = {
1141         .name = "typec_cable",
1142         .groups = typec_cable_groups,
1143         .release = typec_cable_release,
1144 };
1145
1146 static int cable_match(struct device *dev, void *data)
1147 {
1148         return is_typec_cable(dev);
1149 }
1150
1151 /**
1152  * typec_cable_get - Get a reference to the USB Type-C cable
1153  * @port: The USB Type-C Port the cable is connected to
1154  *
1155  * The caller must decrement the reference count with typec_cable_put() after
1156  * use.
1157  */
1158 struct typec_cable *typec_cable_get(struct typec_port *port)
1159 {
1160         struct device *dev;
1161
1162         dev = device_find_child(&port->dev, NULL, cable_match);
1163         if (!dev)
1164                 return NULL;
1165
1166         return to_typec_cable(dev);
1167 }
1168 EXPORT_SYMBOL_GPL(typec_cable_get);
1169
1170 /**
1171  * typec_cable_put - Decrement the reference count on USB Type-C cable
1172  * @cable: The USB Type-C cable
1173  */
1174 void typec_cable_put(struct typec_cable *cable)
1175 {
1176         put_device(&cable->dev);
1177 }
1178 EXPORT_SYMBOL_GPL(typec_cable_put);
1179
1180 /**
1181  * typec_cable_is_active - Check is the USB Type-C cable active or passive
1182  * @cable: The USB Type-C Cable
1183  *
1184  * Return 1 if the cable is active or 0 if it's passive.
1185  */
1186 int typec_cable_is_active(struct typec_cable *cable)
1187 {
1188         return cable->active;
1189 }
1190 EXPORT_SYMBOL_GPL(typec_cable_is_active);
1191
1192 /**
1193  * typec_cable_set_identity - Report result from Discover Identity command
1194  * @cable: The cable updated identity values
1195  *
1196  * This routine is used to report that the result of Discover Identity USB power
1197  * delivery command has become available.
1198  */
1199 int typec_cable_set_identity(struct typec_cable *cable)
1200 {
1201         if (!cable->identity)
1202                 return -EINVAL;
1203
1204         typec_report_identity(&cable->dev);
1205         return 0;
1206 }
1207 EXPORT_SYMBOL_GPL(typec_cable_set_identity);
1208
1209 /**
1210  * typec_register_cable - Register a USB Type-C Cable
1211  * @port: The USB Type-C Port the cable is connected to
1212  * @desc: Description of the cable
1213  *
1214  * Registers a device for USB Type-C Cable described in @desc. The cable will be
1215  * parent for the optional cable plug devises.
1216  *
1217  * Returns handle to the cable on success or ERR_PTR on failure.
1218  */
1219 struct typec_cable *typec_register_cable(struct typec_port *port,
1220                                          struct typec_cable_desc *desc)
1221 {
1222         struct typec_cable *cable;
1223         int ret;
1224
1225         cable = kzalloc(sizeof(*cable), GFP_KERNEL);
1226         if (!cable)
1227                 return ERR_PTR(-ENOMEM);
1228
1229         cable->type = desc->type;
1230         cable->active = desc->active;
1231         cable->pd_revision = desc->pd_revision;
1232
1233         if (desc->identity) {
1234                 /*
1235                  * Creating directory for the identity only if the driver is
1236                  * able to provide data to it.
1237                  */
1238                 cable->dev.groups = usb_pd_id_groups;
1239                 cable->identity = desc->identity;
1240         }
1241
1242         cable->dev.class = &typec_class;
1243         cable->dev.parent = &port->dev;
1244         cable->dev.type = &typec_cable_dev_type;
1245         dev_set_name(&cable->dev, "%s-cable", dev_name(&port->dev));
1246
1247         ret = device_register(&cable->dev);
1248         if (ret) {
1249                 dev_err(&port->dev, "failed to register cable (%d)\n", ret);
1250                 put_device(&cable->dev);
1251                 return ERR_PTR(ret);
1252         }
1253
1254         return cable;
1255 }
1256 EXPORT_SYMBOL_GPL(typec_register_cable);
1257
1258 /**
1259  * typec_unregister_cable - Unregister a USB Type-C Cable
1260  * @cable: The cable to be unregistered
1261  *
1262  * Unregister device created with typec_register_cable().
1263  */
1264 void typec_unregister_cable(struct typec_cable *cable)
1265 {
1266         if (!IS_ERR_OR_NULL(cable))
1267                 device_unregister(&cable->dev);
1268 }
1269 EXPORT_SYMBOL_GPL(typec_unregister_cable);
1270
1271 /* ------------------------------------------------------------------------- */
1272 /* USB Type-C ports */
1273
1274 /**
1275  * typec_port_set_usb_power_delivery - Assign USB PD for port.
1276  * @port: USB Type-C port.
1277  * @pd: USB PD instance.
1278  *
1279  * This routine can be used to set the USB Power Delivery Capabilities for @port
1280  * that it will advertise to the partner.
1281  *
1282  * If @pd is NULL, the assignment is removed.
1283  */
1284 int typec_port_set_usb_power_delivery(struct typec_port *port, struct usb_power_delivery *pd)
1285 {
1286         int ret;
1287
1288         if (IS_ERR_OR_NULL(port) || port->pd == pd)
1289                 return 0;
1290
1291         if (pd) {
1292                 ret = usb_power_delivery_link_device(pd, &port->dev);
1293                 if (ret)
1294                         return ret;
1295         } else {
1296                 usb_power_delivery_unlink_device(port->pd, &port->dev);
1297         }
1298
1299         port->pd = pd;
1300
1301         return 0;
1302 }
1303 EXPORT_SYMBOL_GPL(typec_port_set_usb_power_delivery);
1304
1305 static ssize_t select_usb_power_delivery_store(struct device *dev,
1306                                                struct device_attribute *attr,
1307                                                const char *buf, size_t size)
1308 {
1309         struct typec_port *port = to_typec_port(dev);
1310         struct usb_power_delivery *pd;
1311
1312         if (!port->ops || !port->ops->pd_set)
1313                 return -EOPNOTSUPP;
1314
1315         pd = usb_power_delivery_find(buf);
1316         if (!pd)
1317                 return -EINVAL;
1318
1319         return port->ops->pd_set(port, pd);
1320 }
1321
1322 static ssize_t select_usb_power_delivery_show(struct device *dev,
1323                                               struct device_attribute *attr, char *buf)
1324 {
1325         struct typec_port *port = to_typec_port(dev);
1326         struct usb_power_delivery **pds;
1327         int i, ret = 0;
1328
1329         if (!port->ops || !port->ops->pd_get)
1330                 return -EOPNOTSUPP;
1331
1332         pds = port->ops->pd_get(port);
1333         if (!pds)
1334                 return 0;
1335
1336         for (i = 0; pds[i]; i++) {
1337                 if (pds[i] == port->pd)
1338                         ret += sysfs_emit_at(buf, ret, "[%s] ", dev_name(&pds[i]->dev));
1339                 else
1340                         ret += sysfs_emit_at(buf, ret, "%s ", dev_name(&pds[i]->dev));
1341         }
1342
1343         buf[ret - 1] = '\n';
1344
1345         return ret;
1346 }
1347 static DEVICE_ATTR_RW(select_usb_power_delivery);
1348
1349 static struct attribute *port_attrs[] = {
1350         &dev_attr_select_usb_power_delivery.attr,
1351         NULL
1352 };
1353
1354 static umode_t port_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
1355 {
1356         struct typec_port *port = to_typec_port(kobj_to_dev(kobj));
1357
1358         if (!port->pd || !port->ops || !port->ops->pd_get)
1359                 return 0;
1360         if (!port->ops->pd_set)
1361                 return 0444;
1362
1363         return attr->mode;
1364 }
1365
1366 static const struct attribute_group pd_group = {
1367         .is_visible = port_attr_is_visible,
1368         .attrs = port_attrs,
1369 };
1370
1371 static const char * const typec_orientations[] = {
1372         [TYPEC_ORIENTATION_NONE]        = "unknown",
1373         [TYPEC_ORIENTATION_NORMAL]      = "normal",
1374         [TYPEC_ORIENTATION_REVERSE]     = "reverse",
1375 };
1376
1377 static const char * const typec_roles[] = {
1378         [TYPEC_SINK]    = "sink",
1379         [TYPEC_SOURCE]  = "source",
1380 };
1381
1382 static const char * const typec_data_roles[] = {
1383         [TYPEC_DEVICE]  = "device",
1384         [TYPEC_HOST]    = "host",
1385 };
1386
1387 static const char * const typec_port_power_roles[] = {
1388         [TYPEC_PORT_SRC] = "source",
1389         [TYPEC_PORT_SNK] = "sink",
1390         [TYPEC_PORT_DRP] = "dual",
1391 };
1392
1393 static const char * const typec_port_data_roles[] = {
1394         [TYPEC_PORT_DFP] = "host",
1395         [TYPEC_PORT_UFP] = "device",
1396         [TYPEC_PORT_DRD] = "dual",
1397 };
1398
1399 static const char * const typec_port_types_drp[] = {
1400         [TYPEC_PORT_SRC] = "dual [source] sink",
1401         [TYPEC_PORT_SNK] = "dual source [sink]",
1402         [TYPEC_PORT_DRP] = "[dual] source sink",
1403 };
1404
1405 static ssize_t
1406 preferred_role_store(struct device *dev, struct device_attribute *attr,
1407                      const char *buf, size_t size)
1408 {
1409         struct typec_port *port = to_typec_port(dev);
1410         int role;
1411         int ret;
1412
1413         if (port->cap->type != TYPEC_PORT_DRP) {
1414                 dev_dbg(dev, "Preferred role only supported with DRP ports\n");
1415                 return -EOPNOTSUPP;
1416         }
1417
1418         if (!port->ops || !port->ops->try_role) {
1419                 dev_dbg(dev, "Setting preferred role not supported\n");
1420                 return -EOPNOTSUPP;
1421         }
1422
1423         role = sysfs_match_string(typec_roles, buf);
1424         if (role < 0) {
1425                 if (sysfs_streq(buf, "none"))
1426                         role = TYPEC_NO_PREFERRED_ROLE;
1427                 else
1428                         return -EINVAL;
1429         }
1430
1431         ret = port->ops->try_role(port, role);
1432         if (ret)
1433                 return ret;
1434
1435         port->prefer_role = role;
1436         return size;
1437 }
1438
1439 static ssize_t
1440 preferred_role_show(struct device *dev, struct device_attribute *attr,
1441                     char *buf)
1442 {
1443         struct typec_port *port = to_typec_port(dev);
1444
1445         if (port->cap->type != TYPEC_PORT_DRP)
1446                 return 0;
1447
1448         if (port->prefer_role < 0)
1449                 return 0;
1450
1451         return sprintf(buf, "%s\n", typec_roles[port->prefer_role]);
1452 }
1453 static DEVICE_ATTR_RW(preferred_role);
1454
1455 static ssize_t data_role_store(struct device *dev,
1456                                struct device_attribute *attr,
1457                                const char *buf, size_t size)
1458 {
1459         struct typec_port *port = to_typec_port(dev);
1460         int ret;
1461
1462         if (!port->ops || !port->ops->dr_set) {
1463                 dev_dbg(dev, "data role swapping not supported\n");
1464                 return -EOPNOTSUPP;
1465         }
1466
1467         ret = sysfs_match_string(typec_data_roles, buf);
1468         if (ret < 0)
1469                 return ret;
1470
1471         mutex_lock(&port->port_type_lock);
1472         if (port->cap->data != TYPEC_PORT_DRD) {
1473                 ret = -EOPNOTSUPP;
1474                 goto unlock_and_ret;
1475         }
1476
1477         ret = port->ops->dr_set(port, ret);
1478         if (ret)
1479                 goto unlock_and_ret;
1480
1481         ret = size;
1482 unlock_and_ret:
1483         mutex_unlock(&port->port_type_lock);
1484         return ret;
1485 }
1486
1487 static ssize_t data_role_show(struct device *dev,
1488                               struct device_attribute *attr, char *buf)
1489 {
1490         struct typec_port *port = to_typec_port(dev);
1491
1492         if (port->cap->data == TYPEC_PORT_DRD)
1493                 return sprintf(buf, "%s\n", port->data_role == TYPEC_HOST ?
1494                                "[host] device" : "host [device]");
1495
1496         return sprintf(buf, "[%s]\n", typec_data_roles[port->data_role]);
1497 }
1498 static DEVICE_ATTR_RW(data_role);
1499
1500 static ssize_t power_role_store(struct device *dev,
1501                                 struct device_attribute *attr,
1502                                 const char *buf, size_t size)
1503 {
1504         struct typec_port *port = to_typec_port(dev);
1505         int ret;
1506
1507         if (!port->ops || !port->ops->pr_set) {
1508                 dev_dbg(dev, "power role swapping not supported\n");
1509                 return -EOPNOTSUPP;
1510         }
1511
1512         if (port->pwr_opmode != TYPEC_PWR_MODE_PD) {
1513                 dev_dbg(dev, "partner unable to swap power role\n");
1514                 return -EIO;
1515         }
1516
1517         ret = sysfs_match_string(typec_roles, buf);
1518         if (ret < 0)
1519                 return ret;
1520
1521         mutex_lock(&port->port_type_lock);
1522         if (port->port_type != TYPEC_PORT_DRP) {
1523                 dev_dbg(dev, "port type fixed at \"%s\"",
1524                              typec_port_power_roles[port->port_type]);
1525                 ret = -EOPNOTSUPP;
1526                 goto unlock_and_ret;
1527         }
1528
1529         ret = port->ops->pr_set(port, ret);
1530         if (ret)
1531                 goto unlock_and_ret;
1532
1533         ret = size;
1534 unlock_and_ret:
1535         mutex_unlock(&port->port_type_lock);
1536         return ret;
1537 }
1538
1539 static ssize_t power_role_show(struct device *dev,
1540                                struct device_attribute *attr, char *buf)
1541 {
1542         struct typec_port *port = to_typec_port(dev);
1543
1544         if (port->cap->type == TYPEC_PORT_DRP)
1545                 return sprintf(buf, "%s\n", port->pwr_role == TYPEC_SOURCE ?
1546                                "[source] sink" : "source [sink]");
1547
1548         return sprintf(buf, "[%s]\n", typec_roles[port->pwr_role]);
1549 }
1550 static DEVICE_ATTR_RW(power_role);
1551
1552 static ssize_t
1553 port_type_store(struct device *dev, struct device_attribute *attr,
1554                         const char *buf, size_t size)
1555 {
1556         struct typec_port *port = to_typec_port(dev);
1557         int ret;
1558         enum typec_port_type type;
1559
1560         if (port->cap->type != TYPEC_PORT_DRP ||
1561             !port->ops || !port->ops->port_type_set) {
1562                 dev_dbg(dev, "changing port type not supported\n");
1563                 return -EOPNOTSUPP;
1564         }
1565
1566         ret = sysfs_match_string(typec_port_power_roles, buf);
1567         if (ret < 0)
1568                 return ret;
1569
1570         type = ret;
1571         mutex_lock(&port->port_type_lock);
1572
1573         if (port->port_type == type) {
1574                 ret = size;
1575                 goto unlock_and_ret;
1576         }
1577
1578         ret = port->ops->port_type_set(port, type);
1579         if (ret)
1580                 goto unlock_and_ret;
1581
1582         port->port_type = type;
1583         ret = size;
1584
1585 unlock_and_ret:
1586         mutex_unlock(&port->port_type_lock);
1587         return ret;
1588 }
1589
1590 static ssize_t
1591 port_type_show(struct device *dev, struct device_attribute *attr,
1592                 char *buf)
1593 {
1594         struct typec_port *port = to_typec_port(dev);
1595
1596         if (port->cap->type == TYPEC_PORT_DRP)
1597                 return sprintf(buf, "%s\n",
1598                                typec_port_types_drp[port->port_type]);
1599
1600         return sprintf(buf, "[%s]\n", typec_port_power_roles[port->cap->type]);
1601 }
1602 static DEVICE_ATTR_RW(port_type);
1603
1604 static const char * const typec_pwr_opmodes[] = {
1605         [TYPEC_PWR_MODE_USB]    = "default",
1606         [TYPEC_PWR_MODE_1_5A]   = "1.5A",
1607         [TYPEC_PWR_MODE_3_0A]   = "3.0A",
1608         [TYPEC_PWR_MODE_PD]     = "usb_power_delivery",
1609 };
1610
1611 static ssize_t power_operation_mode_show(struct device *dev,
1612                                          struct device_attribute *attr,
1613                                          char *buf)
1614 {
1615         struct typec_port *port = to_typec_port(dev);
1616
1617         return sprintf(buf, "%s\n", typec_pwr_opmodes[port->pwr_opmode]);
1618 }
1619 static DEVICE_ATTR_RO(power_operation_mode);
1620
1621 static ssize_t vconn_source_store(struct device *dev,
1622                                   struct device_attribute *attr,
1623                                   const char *buf, size_t size)
1624 {
1625         struct typec_port *port = to_typec_port(dev);
1626         bool source;
1627         int ret;
1628
1629         if (!port->cap->pd_revision) {
1630                 dev_dbg(dev, "VCONN swap depends on USB Power Delivery\n");
1631                 return -EOPNOTSUPP;
1632         }
1633
1634         if (!port->ops || !port->ops->vconn_set) {
1635                 dev_dbg(dev, "VCONN swapping not supported\n");
1636                 return -EOPNOTSUPP;
1637         }
1638
1639         ret = kstrtobool(buf, &source);
1640         if (ret)
1641                 return ret;
1642
1643         ret = port->ops->vconn_set(port, (enum typec_role)source);
1644         if (ret)
1645                 return ret;
1646
1647         return size;
1648 }
1649
1650 static ssize_t vconn_source_show(struct device *dev,
1651                                  struct device_attribute *attr, char *buf)
1652 {
1653         struct typec_port *port = to_typec_port(dev);
1654
1655         return sprintf(buf, "%s\n",
1656                        port->vconn_role == TYPEC_SOURCE ? "yes" : "no");
1657 }
1658 static DEVICE_ATTR_RW(vconn_source);
1659
1660 static ssize_t supported_accessory_modes_show(struct device *dev,
1661                                               struct device_attribute *attr,
1662                                               char *buf)
1663 {
1664         struct typec_port *port = to_typec_port(dev);
1665         ssize_t ret = 0;
1666         int i;
1667
1668         for (i = 0; i < ARRAY_SIZE(port->cap->accessory); i++) {
1669                 if (port->cap->accessory[i])
1670                         ret += sprintf(buf + ret, "%s ",
1671                                typec_accessory_modes[port->cap->accessory[i]]);
1672         }
1673
1674         if (!ret)
1675                 return sprintf(buf, "none\n");
1676
1677         buf[ret - 1] = '\n';
1678
1679         return ret;
1680 }
1681 static DEVICE_ATTR_RO(supported_accessory_modes);
1682
1683 static ssize_t usb_typec_revision_show(struct device *dev,
1684                                        struct device_attribute *attr,
1685                                        char *buf)
1686 {
1687         struct typec_port *port = to_typec_port(dev);
1688         u16 rev = port->cap->revision;
1689
1690         return sprintf(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
1691 }
1692 static DEVICE_ATTR_RO(usb_typec_revision);
1693
1694 static ssize_t usb_power_delivery_revision_show(struct device *dev,
1695                                                 struct device_attribute *attr,
1696                                                 char *buf)
1697 {
1698         u16 rev = 0;
1699
1700         if (is_typec_partner(dev)) {
1701                 struct typec_partner *partner = to_typec_partner(dev);
1702
1703                 rev = partner->pd_revision;
1704         } else if (is_typec_cable(dev)) {
1705                 struct typec_cable *cable = to_typec_cable(dev);
1706
1707                 rev = cable->pd_revision;
1708         } else if (is_typec_port(dev)) {
1709                 struct typec_port *p = to_typec_port(dev);
1710
1711                 rev = p->cap->pd_revision;
1712         }
1713         return sysfs_emit(buf, "%d.%d\n", (rev >> 8) & 0xff, (rev >> 4) & 0xf);
1714 }
1715
1716 static ssize_t orientation_show(struct device *dev,
1717                                    struct device_attribute *attr,
1718                                    char *buf)
1719 {
1720         struct typec_port *port = to_typec_port(dev);
1721
1722         return sprintf(buf, "%s\n", typec_orientations[port->orientation]);
1723 }
1724 static DEVICE_ATTR_RO(orientation);
1725
1726 static struct attribute *typec_attrs[] = {
1727         &dev_attr_data_role.attr,
1728         &dev_attr_power_operation_mode.attr,
1729         &dev_attr_power_role.attr,
1730         &dev_attr_preferred_role.attr,
1731         &dev_attr_supported_accessory_modes.attr,
1732         &dev_attr_usb_power_delivery_revision.attr,
1733         &dev_attr_usb_typec_revision.attr,
1734         &dev_attr_vconn_source.attr,
1735         &dev_attr_port_type.attr,
1736         &dev_attr_orientation.attr,
1737         NULL,
1738 };
1739
1740 static umode_t typec_attr_is_visible(struct kobject *kobj,
1741                                      struct attribute *attr, int n)
1742 {
1743         struct typec_port *port = to_typec_port(kobj_to_dev(kobj));
1744
1745         if (attr == &dev_attr_data_role.attr) {
1746                 if (port->cap->data != TYPEC_PORT_DRD ||
1747                     !port->ops || !port->ops->dr_set)
1748                         return 0444;
1749         } else if (attr == &dev_attr_power_role.attr) {
1750                 if (port->cap->type != TYPEC_PORT_DRP ||
1751                     !port->ops || !port->ops->pr_set)
1752                         return 0444;
1753         } else if (attr == &dev_attr_vconn_source.attr) {
1754                 if (!port->cap->pd_revision ||
1755                     !port->ops || !port->ops->vconn_set)
1756                         return 0444;
1757         } else if (attr == &dev_attr_preferred_role.attr) {
1758                 if (port->cap->type != TYPEC_PORT_DRP ||
1759                     !port->ops || !port->ops->try_role)
1760                         return 0444;
1761         } else if (attr == &dev_attr_port_type.attr) {
1762                 if (!port->ops || !port->ops->port_type_set)
1763                         return 0;
1764                 if (port->cap->type != TYPEC_PORT_DRP)
1765                         return 0444;
1766         } else if (attr == &dev_attr_orientation.attr) {
1767                 if (port->cap->orientation_aware)
1768                         return 0444;
1769                 return 0;
1770         }
1771
1772         return attr->mode;
1773 }
1774
1775 static const struct attribute_group typec_group = {
1776         .is_visible = typec_attr_is_visible,
1777         .attrs = typec_attrs,
1778 };
1779
1780 static const struct attribute_group *typec_groups[] = {
1781         &typec_group,
1782         &pd_group,
1783         NULL
1784 };
1785
1786 static int typec_uevent(const struct device *dev, struct kobj_uevent_env *env)
1787 {
1788         int ret;
1789
1790         ret = add_uevent_var(env, "TYPEC_PORT=%s", dev_name(dev));
1791         if (ret)
1792                 dev_err(dev, "failed to add uevent TYPEC_PORT\n");
1793
1794         return ret;
1795 }
1796
1797 static void typec_release(struct device *dev)
1798 {
1799         struct typec_port *port = to_typec_port(dev);
1800
1801         ida_simple_remove(&typec_index_ida, port->id);
1802         ida_destroy(&port->mode_ids);
1803         typec_switch_put(port->sw);
1804         typec_mux_put(port->mux);
1805         typec_retimer_put(port->retimer);
1806         kfree(port->cap);
1807         kfree(port);
1808 }
1809
1810 const struct device_type typec_port_dev_type = {
1811         .name = "typec_port",
1812         .groups = typec_groups,
1813         .uevent = typec_uevent,
1814         .release = typec_release,
1815 };
1816
1817 /* --------------------------------------- */
1818 /* Driver callbacks to report role updates */
1819
1820 static int partner_match(struct device *dev, void *data)
1821 {
1822         return is_typec_partner(dev);
1823 }
1824
1825 static struct typec_partner *typec_get_partner(struct typec_port *port)
1826 {
1827         struct device *dev;
1828
1829         dev = device_find_child(&port->dev, NULL, partner_match);
1830         if (!dev)
1831                 return NULL;
1832
1833         return to_typec_partner(dev);
1834 }
1835
1836 static void typec_partner_attach(struct typec_connector *con, struct device *dev)
1837 {
1838         struct typec_port *port = container_of(con, struct typec_port, con);
1839         struct typec_partner *partner = typec_get_partner(port);
1840         struct usb_device *udev = to_usb_device(dev);
1841
1842         if (udev->speed < USB_SPEED_SUPER)
1843                 port->usb2_dev = dev;
1844         else
1845                 port->usb3_dev = dev;
1846
1847         if (partner) {
1848                 typec_partner_link_device(partner, dev);
1849                 put_device(&partner->dev);
1850         }
1851 }
1852
1853 static void typec_partner_deattach(struct typec_connector *con, struct device *dev)
1854 {
1855         struct typec_port *port = container_of(con, struct typec_port, con);
1856         struct typec_partner *partner = typec_get_partner(port);
1857
1858         if (partner) {
1859                 typec_partner_unlink_device(partner, dev);
1860                 put_device(&partner->dev);
1861         }
1862
1863         if (port->usb2_dev == dev)
1864                 port->usb2_dev = NULL;
1865         else if (port->usb3_dev == dev)
1866                 port->usb3_dev = NULL;
1867 }
1868
1869 /**
1870  * typec_set_data_role - Report data role change
1871  * @port: The USB Type-C Port where the role was changed
1872  * @role: The new data role
1873  *
1874  * This routine is used by the port drivers to report data role changes.
1875  */
1876 void typec_set_data_role(struct typec_port *port, enum typec_data_role role)
1877 {
1878         struct typec_partner *partner;
1879
1880         if (port->data_role == role)
1881                 return;
1882
1883         port->data_role = role;
1884         sysfs_notify(&port->dev.kobj, NULL, "data_role");
1885         kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1886
1887         partner = typec_get_partner(port);
1888         if (!partner)
1889                 return;
1890
1891         if (partner->identity)
1892                 typec_product_type_notify(&partner->dev);
1893
1894         put_device(&partner->dev);
1895 }
1896 EXPORT_SYMBOL_GPL(typec_set_data_role);
1897
1898 /**
1899  * typec_set_pwr_role - Report power role change
1900  * @port: The USB Type-C Port where the role was changed
1901  * @role: The new data role
1902  *
1903  * This routine is used by the port drivers to report power role changes.
1904  */
1905 void typec_set_pwr_role(struct typec_port *port, enum typec_role role)
1906 {
1907         if (port->pwr_role == role)
1908                 return;
1909
1910         port->pwr_role = role;
1911         sysfs_notify(&port->dev.kobj, NULL, "power_role");
1912         kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1913 }
1914 EXPORT_SYMBOL_GPL(typec_set_pwr_role);
1915
1916 /**
1917  * typec_set_vconn_role - Report VCONN source change
1918  * @port: The USB Type-C Port which VCONN role changed
1919  * @role: Source when @port is sourcing VCONN, or Sink when it's not
1920  *
1921  * This routine is used by the port drivers to report if the VCONN source is
1922  * changes.
1923  */
1924 void typec_set_vconn_role(struct typec_port *port, enum typec_role role)
1925 {
1926         if (port->vconn_role == role)
1927                 return;
1928
1929         port->vconn_role = role;
1930         sysfs_notify(&port->dev.kobj, NULL, "vconn_source");
1931         kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1932 }
1933 EXPORT_SYMBOL_GPL(typec_set_vconn_role);
1934
1935 /**
1936  * typec_set_pwr_opmode - Report changed power operation mode
1937  * @port: The USB Type-C Port where the mode was changed
1938  * @opmode: New power operation mode
1939  *
1940  * This routine is used by the port drivers to report changed power operation
1941  * mode in @port. The modes are USB (default), 1.5A, 3.0A as defined in USB
1942  * Type-C specification, and "USB Power Delivery" when the power levels are
1943  * negotiated with methods defined in USB Power Delivery specification.
1944  */
1945 void typec_set_pwr_opmode(struct typec_port *port,
1946                           enum typec_pwr_opmode opmode)
1947 {
1948         struct device *partner_dev;
1949
1950         if (port->pwr_opmode == opmode)
1951                 return;
1952
1953         port->pwr_opmode = opmode;
1954         sysfs_notify(&port->dev.kobj, NULL, "power_operation_mode");
1955         kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
1956
1957         partner_dev = device_find_child(&port->dev, NULL, partner_match);
1958         if (partner_dev) {
1959                 struct typec_partner *partner = to_typec_partner(partner_dev);
1960
1961                 if (opmode == TYPEC_PWR_MODE_PD && !partner->usb_pd) {
1962                         partner->usb_pd = 1;
1963                         sysfs_notify(&partner_dev->kobj, NULL,
1964                                      "supports_usb_power_delivery");
1965                         kobject_uevent(&partner_dev->kobj, KOBJ_CHANGE);
1966                 }
1967                 put_device(partner_dev);
1968         }
1969 }
1970 EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
1971
1972 /**
1973  * typec_find_pwr_opmode - Get the typec power operation mode capability
1974  * @name: power operation mode string
1975  *
1976  * This routine is used to find the typec_pwr_opmode by its string @name.
1977  *
1978  * Returns typec_pwr_opmode if success, otherwise negative error code.
1979  */
1980 int typec_find_pwr_opmode(const char *name)
1981 {
1982         return match_string(typec_pwr_opmodes,
1983                             ARRAY_SIZE(typec_pwr_opmodes), name);
1984 }
1985 EXPORT_SYMBOL_GPL(typec_find_pwr_opmode);
1986
1987 /**
1988  * typec_find_orientation - Convert orientation string to enum typec_orientation
1989  * @name: Orientation string
1990  *
1991  * This routine is used to find the typec_orientation by its string name @name.
1992  *
1993  * Returns the orientation value on success, otherwise negative error code.
1994  */
1995 int typec_find_orientation(const char *name)
1996 {
1997         return match_string(typec_orientations, ARRAY_SIZE(typec_orientations),
1998                             name);
1999 }
2000 EXPORT_SYMBOL_GPL(typec_find_orientation);
2001
2002 /**
2003  * typec_find_port_power_role - Get the typec port power capability
2004  * @name: port power capability string
2005  *
2006  * This routine is used to find the typec_port_type by its string name.
2007  *
2008  * Returns typec_port_type if success, otherwise negative error code.
2009  */
2010 int typec_find_port_power_role(const char *name)
2011 {
2012         return match_string(typec_port_power_roles,
2013                             ARRAY_SIZE(typec_port_power_roles), name);
2014 }
2015 EXPORT_SYMBOL_GPL(typec_find_port_power_role);
2016
2017 /**
2018  * typec_find_power_role - Find the typec one specific power role
2019  * @name: power role string
2020  *
2021  * This routine is used to find the typec_role by its string name.
2022  *
2023  * Returns typec_role if success, otherwise negative error code.
2024  */
2025 int typec_find_power_role(const char *name)
2026 {
2027         return match_string(typec_roles, ARRAY_SIZE(typec_roles), name);
2028 }
2029 EXPORT_SYMBOL_GPL(typec_find_power_role);
2030
2031 /**
2032  * typec_find_port_data_role - Get the typec port data capability
2033  * @name: port data capability string
2034  *
2035  * This routine is used to find the typec_port_data by its string name.
2036  *
2037  * Returns typec_port_data if success, otherwise negative error code.
2038  */
2039 int typec_find_port_data_role(const char *name)
2040 {
2041         return match_string(typec_port_data_roles,
2042                             ARRAY_SIZE(typec_port_data_roles), name);
2043 }
2044 EXPORT_SYMBOL_GPL(typec_find_port_data_role);
2045
2046 /* ------------------------------------------ */
2047 /* API for Multiplexer/DeMultiplexer Switches */
2048
2049 /**
2050  * typec_set_orientation - Set USB Type-C cable plug orientation
2051  * @port: USB Type-C Port
2052  * @orientation: USB Type-C cable plug orientation
2053  *
2054  * Set cable plug orientation for @port.
2055  */
2056 int typec_set_orientation(struct typec_port *port,
2057                           enum typec_orientation orientation)
2058 {
2059         int ret;
2060
2061         ret = typec_switch_set(port->sw, orientation);
2062         if (ret)
2063                 return ret;
2064
2065         port->orientation = orientation;
2066         sysfs_notify(&port->dev.kobj, NULL, "orientation");
2067         kobject_uevent(&port->dev.kobj, KOBJ_CHANGE);
2068
2069         return 0;
2070 }
2071 EXPORT_SYMBOL_GPL(typec_set_orientation);
2072
2073 /**
2074  * typec_get_orientation - Get USB Type-C cable plug orientation
2075  * @port: USB Type-C Port
2076  *
2077  * Get current cable plug orientation for @port.
2078  */
2079 enum typec_orientation typec_get_orientation(struct typec_port *port)
2080 {
2081         return port->orientation;
2082 }
2083 EXPORT_SYMBOL_GPL(typec_get_orientation);
2084
2085 /**
2086  * typec_set_mode - Set mode of operation for USB Type-C connector
2087  * @port: USB Type-C connector
2088  * @mode: Accessory Mode, USB Operation or Safe State
2089  *
2090  * Configure @port for Accessory Mode @mode. This function will configure the
2091  * muxes needed for @mode.
2092  */
2093 int typec_set_mode(struct typec_port *port, int mode)
2094 {
2095         struct typec_mux_state state = { };
2096
2097         state.mode = mode;
2098
2099         return typec_mux_set(port->mux, &state);
2100 }
2101 EXPORT_SYMBOL_GPL(typec_set_mode);
2102
2103 /* --------------------------------------- */
2104
2105 /**
2106  * typec_get_negotiated_svdm_version - Get negotiated SVDM Version
2107  * @port: USB Type-C Port.
2108  *
2109  * Get the negotiated SVDM Version. The Version is set to the port default
2110  * value stored in typec_capability on partner registration, and updated after
2111  * a successful Discover Identity if the negotiated value is less than the
2112  * default value.
2113  *
2114  * Returns usb_pd_svdm_ver if the partner has been registered otherwise -ENODEV.
2115  */
2116 int typec_get_negotiated_svdm_version(struct typec_port *port)
2117 {
2118         enum usb_pd_svdm_ver svdm_version;
2119         struct device *partner_dev;
2120
2121         partner_dev = device_find_child(&port->dev, NULL, partner_match);
2122         if (!partner_dev)
2123                 return -ENODEV;
2124
2125         svdm_version = to_typec_partner(partner_dev)->svdm_version;
2126         put_device(partner_dev);
2127
2128         return svdm_version;
2129 }
2130 EXPORT_SYMBOL_GPL(typec_get_negotiated_svdm_version);
2131
2132 /**
2133  * typec_get_drvdata - Return private driver data pointer
2134  * @port: USB Type-C port
2135  */
2136 void *typec_get_drvdata(struct typec_port *port)
2137 {
2138         return dev_get_drvdata(&port->dev);
2139 }
2140 EXPORT_SYMBOL_GPL(typec_get_drvdata);
2141
2142 int typec_get_fw_cap(struct typec_capability *cap,
2143                      struct fwnode_handle *fwnode)
2144 {
2145         const char *cap_str;
2146         int ret;
2147
2148         cap->fwnode = fwnode;
2149
2150         ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
2151         if (ret < 0)
2152                 return ret;
2153
2154         ret = typec_find_port_power_role(cap_str);
2155         if (ret < 0)
2156                 return ret;
2157         cap->type = ret;
2158
2159         /* USB data support is optional */
2160         ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
2161         if (ret == 0) {
2162                 ret = typec_find_port_data_role(cap_str);
2163                 if (ret < 0)
2164                         return ret;
2165                 cap->data = ret;
2166         }
2167
2168         /* Get the preferred power role for a DRP */
2169         if (cap->type == TYPEC_PORT_DRP) {
2170                 cap->prefer_role = TYPEC_NO_PREFERRED_ROLE;
2171
2172                 ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
2173                 if (ret == 0) {
2174                         ret = typec_find_power_role(cap_str);
2175                         if (ret < 0)
2176                                 return ret;
2177                         cap->prefer_role = ret;
2178                 }
2179         }
2180
2181         return 0;
2182 }
2183 EXPORT_SYMBOL_GPL(typec_get_fw_cap);
2184
2185 /**
2186  * typec_port_register_altmode - Register USB Type-C Port Alternate Mode
2187  * @port: USB Type-C Port that supports the alternate mode
2188  * @desc: Description of the alternate mode
2189  *
2190  * This routine is used to register an alternate mode that @port is capable of
2191  * supporting.
2192  *
2193  * Returns handle to the alternate mode on success or ERR_PTR on failure.
2194  */
2195 struct typec_altmode *
2196 typec_port_register_altmode(struct typec_port *port,
2197                             const struct typec_altmode_desc *desc)
2198 {
2199         struct typec_altmode *adev;
2200         struct typec_mux *mux;
2201         struct typec_retimer *retimer;
2202
2203         mux = typec_mux_get(&port->dev);
2204         if (IS_ERR(mux))
2205                 return ERR_CAST(mux);
2206
2207         retimer = typec_retimer_get(&port->dev);
2208         if (IS_ERR(retimer)) {
2209                 typec_mux_put(mux);
2210                 return ERR_CAST(retimer);
2211         }
2212
2213         adev = typec_register_altmode(&port->dev, desc);
2214         if (IS_ERR(adev)) {
2215                 typec_retimer_put(retimer);
2216                 typec_mux_put(mux);
2217         } else {
2218                 to_altmode(adev)->mux = mux;
2219                 to_altmode(adev)->retimer = retimer;
2220         }
2221
2222         return adev;
2223 }
2224 EXPORT_SYMBOL_GPL(typec_port_register_altmode);
2225
2226 void typec_port_register_altmodes(struct typec_port *port,
2227         const struct typec_altmode_ops *ops, void *drvdata,
2228         struct typec_altmode **altmodes, size_t n)
2229 {
2230         struct fwnode_handle *altmodes_node, *child;
2231         struct typec_altmode_desc desc;
2232         struct typec_altmode *alt;
2233         size_t index = 0;
2234         u32 svid, vdo;
2235         int ret;
2236
2237         altmodes_node = device_get_named_child_node(&port->dev, "altmodes");
2238         if (!altmodes_node)
2239                 return; /* No altmodes specified */
2240
2241         fwnode_for_each_child_node(altmodes_node, child) {
2242                 ret = fwnode_property_read_u32(child, "svid", &svid);
2243                 if (ret) {
2244                         dev_err(&port->dev, "Error reading svid for altmode %s\n",
2245                                 fwnode_get_name(child));
2246                         continue;
2247                 }
2248
2249                 ret = fwnode_property_read_u32(child, "vdo", &vdo);
2250                 if (ret) {
2251                         dev_err(&port->dev, "Error reading vdo for altmode %s\n",
2252                                 fwnode_get_name(child));
2253                         continue;
2254                 }
2255
2256                 if (index >= n) {
2257                         dev_err(&port->dev, "Error not enough space for altmode %s\n",
2258                                 fwnode_get_name(child));
2259                         continue;
2260                 }
2261
2262                 desc.svid = svid;
2263                 desc.vdo = vdo;
2264                 desc.mode = index + 1;
2265                 alt = typec_port_register_altmode(port, &desc);
2266                 if (IS_ERR(alt)) {
2267                         dev_err(&port->dev, "Error registering altmode %s\n",
2268                                 fwnode_get_name(child));
2269                         continue;
2270                 }
2271
2272                 alt->ops = ops;
2273                 typec_altmode_set_drvdata(alt, drvdata);
2274                 altmodes[index] = alt;
2275                 index++;
2276         }
2277 }
2278 EXPORT_SYMBOL_GPL(typec_port_register_altmodes);
2279
2280 /**
2281  * typec_register_port - Register a USB Type-C Port
2282  * @parent: Parent device
2283  * @cap: Description of the port
2284  *
2285  * Registers a device for USB Type-C Port described in @cap.
2286  *
2287  * Returns handle to the port on success or ERR_PTR on failure.
2288  */
2289 struct typec_port *typec_register_port(struct device *parent,
2290                                        const struct typec_capability *cap)
2291 {
2292         struct typec_port *port;
2293         int ret;
2294         int id;
2295
2296         port = kzalloc(sizeof(*port), GFP_KERNEL);
2297         if (!port)
2298                 return ERR_PTR(-ENOMEM);
2299
2300         id = ida_simple_get(&typec_index_ida, 0, 0, GFP_KERNEL);
2301         if (id < 0) {
2302                 kfree(port);
2303                 return ERR_PTR(id);
2304         }
2305
2306         switch (cap->type) {
2307         case TYPEC_PORT_SRC:
2308                 port->pwr_role = TYPEC_SOURCE;
2309                 port->vconn_role = TYPEC_SOURCE;
2310                 break;
2311         case TYPEC_PORT_SNK:
2312                 port->pwr_role = TYPEC_SINK;
2313                 port->vconn_role = TYPEC_SINK;
2314                 break;
2315         case TYPEC_PORT_DRP:
2316                 if (cap->prefer_role != TYPEC_NO_PREFERRED_ROLE)
2317                         port->pwr_role = cap->prefer_role;
2318                 else
2319                         port->pwr_role = TYPEC_SINK;
2320                 break;
2321         }
2322
2323         switch (cap->data) {
2324         case TYPEC_PORT_DFP:
2325                 port->data_role = TYPEC_HOST;
2326                 break;
2327         case TYPEC_PORT_UFP:
2328                 port->data_role = TYPEC_DEVICE;
2329                 break;
2330         case TYPEC_PORT_DRD:
2331                 if (cap->prefer_role == TYPEC_SOURCE)
2332                         port->data_role = TYPEC_HOST;
2333                 else
2334                         port->data_role = TYPEC_DEVICE;
2335                 break;
2336         }
2337
2338         ida_init(&port->mode_ids);
2339         mutex_init(&port->port_type_lock);
2340
2341         port->id = id;
2342         port->ops = cap->ops;
2343         port->port_type = cap->type;
2344         port->prefer_role = cap->prefer_role;
2345         port->con.attach = typec_partner_attach;
2346         port->con.deattach = typec_partner_deattach;
2347
2348         device_initialize(&port->dev);
2349         port->dev.class = &typec_class;
2350         port->dev.parent = parent;
2351         port->dev.fwnode = cap->fwnode;
2352         port->dev.type = &typec_port_dev_type;
2353         dev_set_name(&port->dev, "port%d", id);
2354         dev_set_drvdata(&port->dev, cap->driver_data);
2355
2356         port->cap = kmemdup(cap, sizeof(*cap), GFP_KERNEL);
2357         if (!port->cap) {
2358                 put_device(&port->dev);
2359                 return ERR_PTR(-ENOMEM);
2360         }
2361
2362         port->sw = typec_switch_get(&port->dev);
2363         if (IS_ERR(port->sw)) {
2364                 ret = PTR_ERR(port->sw);
2365                 put_device(&port->dev);
2366                 return ERR_PTR(ret);
2367         }
2368
2369         port->mux = typec_mux_get(&port->dev);
2370         if (IS_ERR(port->mux)) {
2371                 ret = PTR_ERR(port->mux);
2372                 put_device(&port->dev);
2373                 return ERR_PTR(ret);
2374         }
2375
2376         port->retimer = typec_retimer_get(&port->dev);
2377         if (IS_ERR(port->retimer)) {
2378                 ret = PTR_ERR(port->retimer);
2379                 put_device(&port->dev);
2380                 return ERR_PTR(ret);
2381         }
2382
2383         port->pd = cap->pd;
2384
2385         ret = device_add(&port->dev);
2386         if (ret) {
2387                 dev_err(parent, "failed to register port (%d)\n", ret);
2388                 put_device(&port->dev);
2389                 return ERR_PTR(ret);
2390         }
2391
2392         ret = usb_power_delivery_link_device(port->pd, &port->dev);
2393         if (ret) {
2394                 dev_err(&port->dev, "failed to link pd\n");
2395                 device_unregister(&port->dev);
2396                 return ERR_PTR(ret);
2397         }
2398
2399         ret = typec_link_ports(port);
2400         if (ret)
2401                 dev_warn(&port->dev, "failed to create symlinks (%d)\n", ret);
2402
2403         return port;
2404 }
2405 EXPORT_SYMBOL_GPL(typec_register_port);
2406
2407 /**
2408  * typec_unregister_port - Unregister a USB Type-C Port
2409  * @port: The port to be unregistered
2410  *
2411  * Unregister device created with typec_register_port().
2412  */
2413 void typec_unregister_port(struct typec_port *port)
2414 {
2415         if (!IS_ERR_OR_NULL(port)) {
2416                 typec_unlink_ports(port);
2417                 typec_port_set_usb_power_delivery(port, NULL);
2418                 device_unregister(&port->dev);
2419         }
2420 }
2421 EXPORT_SYMBOL_GPL(typec_unregister_port);
2422
2423 static int __init typec_init(void)
2424 {
2425         int ret;
2426
2427         ret = bus_register(&typec_bus);
2428         if (ret)
2429                 return ret;
2430
2431         ret = class_register(&typec_mux_class);
2432         if (ret)
2433                 goto err_unregister_bus;
2434
2435         ret = class_register(&retimer_class);
2436         if (ret)
2437                 goto err_unregister_mux_class;
2438
2439         ret = class_register(&typec_class);
2440         if (ret)
2441                 goto err_unregister_retimer_class;
2442
2443         ret = usb_power_delivery_init();
2444         if (ret)
2445                 goto err_unregister_class;
2446
2447         return 0;
2448
2449 err_unregister_class:
2450         class_unregister(&typec_class);
2451
2452 err_unregister_retimer_class:
2453         class_unregister(&retimer_class);
2454
2455 err_unregister_mux_class:
2456         class_unregister(&typec_mux_class);
2457
2458 err_unregister_bus:
2459         bus_unregister(&typec_bus);
2460
2461         return ret;
2462 }
2463 subsys_initcall(typec_init);
2464
2465 static void __exit typec_exit(void)
2466 {
2467         usb_power_delivery_exit();
2468         class_unregister(&typec_class);
2469         ida_destroy(&typec_index_ida);
2470         bus_unregister(&typec_bus);
2471         class_unregister(&typec_mux_class);
2472         class_unregister(&retimer_class);
2473 }
2474 module_exit(typec_exit);
2475
2476 MODULE_AUTHOR("Heikki Krogerus <[email protected]>");
2477 MODULE_LICENSE("GPL v2");
2478 MODULE_DESCRIPTION("USB Type-C Connector Class");
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