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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * usb port device code
4 *
5 * Copyright (C) 2012 Intel Corp
6 *
7 * Author: Lan Tianyu <tianyu.lan@intel.com>
8 */
9
10#include <linux/kstrtox.h>
11#include <linux/slab.h>
12#include <linux/pm_qos.h>
13#include <linux/component.h>
14
15#include "hub.h"
16
17static int usb_port_block_power_off;
18
19static const struct attribute_group *port_dev_group[];
20
21static ssize_t early_stop_show(struct device *dev,
22 struct device_attribute *attr, char *buf)
23{
24 struct usb_port *port_dev = to_usb_port(dev);
25
26 return sysfs_emit(buf, "%s\n", port_dev->early_stop ? "yes" : "no");
27}
28
29static ssize_t early_stop_store(struct device *dev, struct device_attribute *attr,
30 const char *buf, size_t count)
31{
32 struct usb_port *port_dev = to_usb_port(dev);
33 bool value;
34
35 if (kstrtobool(buf, &value))
36 return -EINVAL;
37
38 if (value)
39 port_dev->early_stop = 1;
40 else
41 port_dev->early_stop = 0;
42
43 return count;
44}
45static DEVICE_ATTR_RW(early_stop);
46
47static ssize_t disable_show(struct device *dev,
48 struct device_attribute *attr, char *buf)
49{
50 struct usb_port *port_dev = to_usb_port(dev);
51 struct usb_device *hdev = to_usb_device(dev->parent->parent);
52 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
53 struct usb_interface *intf = to_usb_interface(hub->intfdev);
54 int port1 = port_dev->portnum;
55 u16 portstatus, unused;
56 bool disabled;
57 int rc;
58
59 rc = usb_autopm_get_interface(intf);
60 if (rc < 0)
61 return rc;
62
63 usb_lock_device(hdev);
64 if (hub->disconnected) {
65 rc = -ENODEV;
66 goto out_hdev_lock;
67 }
68
69 usb_hub_port_status(hub, port1, &portstatus, &unused);
70 disabled = !usb_port_is_power_on(hub, portstatus);
71
72out_hdev_lock:
73 usb_unlock_device(hdev);
74 usb_autopm_put_interface(intf);
75
76 if (rc)
77 return rc;
78
79 return sysfs_emit(buf, "%s\n", disabled ? "1" : "0");
80}
81
82static ssize_t disable_store(struct device *dev, struct device_attribute *attr,
83 const char *buf, size_t count)
84{
85 struct usb_port *port_dev = to_usb_port(dev);
86 struct usb_device *hdev = to_usb_device(dev->parent->parent);
87 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
88 struct usb_interface *intf = to_usb_interface(hub->intfdev);
89 int port1 = port_dev->portnum;
90 bool disabled;
91 int rc;
92
93 rc = kstrtobool(buf, &disabled);
94 if (rc)
95 return rc;
96
97 rc = usb_autopm_get_interface(intf);
98 if (rc < 0)
99 return rc;
100
101 usb_lock_device(hdev);
102 if (hub->disconnected) {
103 rc = -ENODEV;
104 goto out_hdev_lock;
105 }
106
107 if (disabled && port_dev->child)
108 usb_disconnect(&port_dev->child);
109
110 rc = usb_hub_set_port_power(hdev, hub, port1, !disabled);
111
112 if (disabled) {
113 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
114 if (!port_dev->is_superspeed)
115 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
116 }
117
118 if (!rc)
119 rc = count;
120
121out_hdev_lock:
122 usb_unlock_device(hdev);
123 usb_autopm_put_interface(intf);
124
125 return rc;
126}
127static DEVICE_ATTR_RW(disable);
128
129static ssize_t location_show(struct device *dev,
130 struct device_attribute *attr, char *buf)
131{
132 struct usb_port *port_dev = to_usb_port(dev);
133
134 return sprintf(buf, "0x%08x\n", port_dev->location);
135}
136static DEVICE_ATTR_RO(location);
137
138static ssize_t connect_type_show(struct device *dev,
139 struct device_attribute *attr, char *buf)
140{
141 struct usb_port *port_dev = to_usb_port(dev);
142 char *result;
143
144 switch (port_dev->connect_type) {
145 case USB_PORT_CONNECT_TYPE_HOT_PLUG:
146 result = "hotplug";
147 break;
148 case USB_PORT_CONNECT_TYPE_HARD_WIRED:
149 result = "hardwired";
150 break;
151 case USB_PORT_NOT_USED:
152 result = "not used";
153 break;
154 default:
155 result = "unknown";
156 break;
157 }
158
159 return sprintf(buf, "%s\n", result);
160}
161static DEVICE_ATTR_RO(connect_type);
162
163static ssize_t state_show(struct device *dev,
164 struct device_attribute *attr, char *buf)
165{
166 struct usb_port *port_dev = to_usb_port(dev);
167 enum usb_device_state state = READ_ONCE(port_dev->state);
168
169 return sysfs_emit(buf, "%s\n", usb_state_string(state));
170}
171static DEVICE_ATTR_RO(state);
172
173static ssize_t over_current_count_show(struct device *dev,
174 struct device_attribute *attr, char *buf)
175{
176 struct usb_port *port_dev = to_usb_port(dev);
177
178 return sprintf(buf, "%u\n", port_dev->over_current_count);
179}
180static DEVICE_ATTR_RO(over_current_count);
181
182static ssize_t quirks_show(struct device *dev,
183 struct device_attribute *attr, char *buf)
184{
185 struct usb_port *port_dev = to_usb_port(dev);
186
187 return sprintf(buf, "%08x\n", port_dev->quirks);
188}
189
190static ssize_t quirks_store(struct device *dev, struct device_attribute *attr,
191 const char *buf, size_t count)
192{
193 struct usb_port *port_dev = to_usb_port(dev);
194 u32 value;
195
196 if (kstrtou32(buf, 16, &value))
197 return -EINVAL;
198
199 port_dev->quirks = value;
200 return count;
201}
202static DEVICE_ATTR_RW(quirks);
203
204static ssize_t usb3_lpm_permit_show(struct device *dev,
205 struct device_attribute *attr, char *buf)
206{
207 struct usb_port *port_dev = to_usb_port(dev);
208 const char *p;
209
210 if (port_dev->usb3_lpm_u1_permit) {
211 if (port_dev->usb3_lpm_u2_permit)
212 p = "u1_u2";
213 else
214 p = "u1";
215 } else {
216 if (port_dev->usb3_lpm_u2_permit)
217 p = "u2";
218 else
219 p = "0";
220 }
221
222 return sprintf(buf, "%s\n", p);
223}
224
225static ssize_t usb3_lpm_permit_store(struct device *dev,
226 struct device_attribute *attr,
227 const char *buf, size_t count)
228{
229 struct usb_port *port_dev = to_usb_port(dev);
230 struct usb_device *udev = port_dev->child;
231 struct usb_hcd *hcd;
232
233 if (!strncmp(buf, "u1_u2", 5)) {
234 port_dev->usb3_lpm_u1_permit = 1;
235 port_dev->usb3_lpm_u2_permit = 1;
236
237 } else if (!strncmp(buf, "u1", 2)) {
238 port_dev->usb3_lpm_u1_permit = 1;
239 port_dev->usb3_lpm_u2_permit = 0;
240
241 } else if (!strncmp(buf, "u2", 2)) {
242 port_dev->usb3_lpm_u1_permit = 0;
243 port_dev->usb3_lpm_u2_permit = 1;
244
245 } else if (!strncmp(buf, "0", 1)) {
246 port_dev->usb3_lpm_u1_permit = 0;
247 port_dev->usb3_lpm_u2_permit = 0;
248 } else
249 return -EINVAL;
250
251 /* If device is connected to the port, disable or enable lpm
252 * to make new u1 u2 setting take effect immediately.
253 */
254 if (udev) {
255 hcd = bus_to_hcd(udev->bus);
256 if (!hcd)
257 return -EINVAL;
258 usb_lock_device(udev);
259 mutex_lock(hcd->bandwidth_mutex);
260 if (!usb_disable_lpm(udev))
261 usb_enable_lpm(udev);
262 mutex_unlock(hcd->bandwidth_mutex);
263 usb_unlock_device(udev);
264 }
265
266 return count;
267}
268static DEVICE_ATTR_RW(usb3_lpm_permit);
269
270static struct attribute *port_dev_attrs[] = {
271 &dev_attr_connect_type.attr,
272 &dev_attr_state.attr,
273 &dev_attr_location.attr,
274 &dev_attr_quirks.attr,
275 &dev_attr_over_current_count.attr,
276 &dev_attr_disable.attr,
277 &dev_attr_early_stop.attr,
278 NULL,
279};
280
281static const struct attribute_group port_dev_attr_grp = {
282 .attrs = port_dev_attrs,
283};
284
285static const struct attribute_group *port_dev_group[] = {
286 &port_dev_attr_grp,
287 NULL,
288};
289
290static struct attribute *port_dev_usb3_attrs[] = {
291 &dev_attr_usb3_lpm_permit.attr,
292 NULL,
293};
294
295static const struct attribute_group port_dev_usb3_attr_grp = {
296 .attrs = port_dev_usb3_attrs,
297};
298
299static const struct attribute_group *port_dev_usb3_group[] = {
300 &port_dev_attr_grp,
301 &port_dev_usb3_attr_grp,
302 NULL,
303};
304
305static void usb_port_device_release(struct device *dev)
306{
307 struct usb_port *port_dev = to_usb_port(dev);
308
309 kfree(port_dev->req);
310 kfree(port_dev);
311}
312
313#ifdef CONFIG_PM
314static int usb_port_runtime_resume(struct device *dev)
315{
316 struct usb_port *port_dev = to_usb_port(dev);
317 struct usb_device *hdev = to_usb_device(dev->parent->parent);
318 struct usb_interface *intf = to_usb_interface(dev->parent);
319 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
320 struct usb_device *udev = port_dev->child;
321 struct usb_port *peer = port_dev->peer;
322 int port1 = port_dev->portnum;
323 int retval;
324
325 if (!hub)
326 return -EINVAL;
327 if (hub->in_reset) {
328 set_bit(port1, hub->power_bits);
329 return 0;
330 }
331
332 /*
333 * Power on our usb3 peer before this usb2 port to prevent a usb3
334 * device from degrading to its usb2 connection
335 */
336 if (!port_dev->is_superspeed && peer)
337 pm_runtime_get_sync(&peer->dev);
338
339 retval = usb_autopm_get_interface(intf);
340 if (retval < 0)
341 return retval;
342
343 retval = usb_hub_set_port_power(hdev, hub, port1, true);
344 msleep(hub_power_on_good_delay(hub));
345 if (udev && !retval) {
346 /*
347 * Our preference is to simply wait for the port to reconnect,
348 * as that is the lowest latency method to restart the port.
349 * However, there are cases where toggling port power results in
350 * the host port and the device port getting out of sync causing
351 * a link training live lock. Upon timeout, flag the port as
352 * needing warm reset recovery (to be performed later by
353 * usb_port_resume() as requested via usb_wakeup_notification())
354 */
355 if (hub_port_debounce_be_connected(hub, port1) < 0) {
356 dev_dbg(&port_dev->dev, "reconnect timeout\n");
357 if (hub_is_superspeed(hdev))
358 set_bit(port1, hub->warm_reset_bits);
359 }
360
361 /* Force the child awake to revalidate after the power loss. */
362 if (!test_and_set_bit(port1, hub->child_usage_bits)) {
363 pm_runtime_get_noresume(&port_dev->dev);
364 pm_request_resume(&udev->dev);
365 }
366 }
367
368 usb_autopm_put_interface(intf);
369
370 return retval;
371}
372
373static int usb_port_runtime_suspend(struct device *dev)
374{
375 struct usb_port *port_dev = to_usb_port(dev);
376 struct usb_device *hdev = to_usb_device(dev->parent->parent);
377 struct usb_interface *intf = to_usb_interface(dev->parent);
378 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
379 struct usb_port *peer = port_dev->peer;
380 int port1 = port_dev->portnum;
381 int retval;
382
383 if (!hub)
384 return -EINVAL;
385 if (hub->in_reset)
386 return -EBUSY;
387
388 if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF)
389 == PM_QOS_FLAGS_ALL)
390 return -EAGAIN;
391
392 if (usb_port_block_power_off)
393 return -EBUSY;
394
395 retval = usb_autopm_get_interface(intf);
396 if (retval < 0)
397 return retval;
398
399 retval = usb_hub_set_port_power(hdev, hub, port1, false);
400 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
401 if (!port_dev->is_superspeed)
402 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
403 usb_autopm_put_interface(intf);
404
405 /*
406 * Our peer usb3 port may now be able to suspend, so
407 * asynchronously queue a suspend request to observe that this
408 * usb2 port is now off.
409 */
410 if (!port_dev->is_superspeed && peer)
411 pm_runtime_put(&peer->dev);
412
413 return retval;
414}
415#endif
416
417static void usb_port_shutdown(struct device *dev)
418{
419 struct usb_port *port_dev = to_usb_port(dev);
420
421 if (port_dev->child)
422 usb_disable_usb2_hardware_lpm(port_dev->child);
423}
424
425static const struct dev_pm_ops usb_port_pm_ops = {
426#ifdef CONFIG_PM
427 .runtime_suspend = usb_port_runtime_suspend,
428 .runtime_resume = usb_port_runtime_resume,
429#endif
430};
431
432struct device_type usb_port_device_type = {
433 .name = "usb_port",
434 .release = usb_port_device_release,
435 .pm = &usb_port_pm_ops,
436};
437
438static struct device_driver usb_port_driver = {
439 .name = "usb",
440 .owner = THIS_MODULE,
441 .shutdown = usb_port_shutdown,
442};
443
444static int link_peers(struct usb_port *left, struct usb_port *right)
445{
446 struct usb_port *ss_port, *hs_port;
447 int rc;
448
449 if (left->peer == right && right->peer == left)
450 return 0;
451
452 if (left->peer || right->peer) {
453 struct usb_port *lpeer = left->peer;
454 struct usb_port *rpeer = right->peer;
455 char *method;
456
457 if (left->location && left->location == right->location)
458 method = "location";
459 else
460 method = "default";
461
462 pr_debug("usb: failed to peer %s and %s by %s (%s:%s) (%s:%s)\n",
463 dev_name(&left->dev), dev_name(&right->dev), method,
464 dev_name(&left->dev),
465 lpeer ? dev_name(&lpeer->dev) : "none",
466 dev_name(&right->dev),
467 rpeer ? dev_name(&rpeer->dev) : "none");
468 return -EBUSY;
469 }
470
471 rc = sysfs_create_link(&left->dev.kobj, &right->dev.kobj, "peer");
472 if (rc)
473 return rc;
474 rc = sysfs_create_link(&right->dev.kobj, &left->dev.kobj, "peer");
475 if (rc) {
476 sysfs_remove_link(&left->dev.kobj, "peer");
477 return rc;
478 }
479
480 /*
481 * We need to wake the HiSpeed port to make sure we don't race
482 * setting ->peer with usb_port_runtime_suspend(). Otherwise we
483 * may miss a suspend event for the SuperSpeed port.
484 */
485 if (left->is_superspeed) {
486 ss_port = left;
487 WARN_ON(right->is_superspeed);
488 hs_port = right;
489 } else {
490 ss_port = right;
491 WARN_ON(!right->is_superspeed);
492 hs_port = left;
493 }
494 pm_runtime_get_sync(&hs_port->dev);
495
496 left->peer = right;
497 right->peer = left;
498
499 /*
500 * The SuperSpeed reference is dropped when the HiSpeed port in
501 * this relationship suspends, i.e. when it is safe to allow a
502 * SuperSpeed connection to drop since there is no risk of a
503 * device degrading to its powered-off HiSpeed connection.
504 *
505 * Also, drop the HiSpeed ref taken above.
506 */
507 pm_runtime_get_sync(&ss_port->dev);
508 pm_runtime_put(&hs_port->dev);
509
510 return 0;
511}
512
513static void link_peers_report(struct usb_port *left, struct usb_port *right)
514{
515 int rc;
516
517 rc = link_peers(left, right);
518 if (rc == 0) {
519 dev_dbg(&left->dev, "peered to %s\n", dev_name(&right->dev));
520 } else {
521 dev_dbg(&left->dev, "failed to peer to %s (%d)\n",
522 dev_name(&right->dev), rc);
523 pr_warn_once("usb: port power management may be unreliable\n");
524 usb_port_block_power_off = 1;
525 }
526}
527
528static void unlink_peers(struct usb_port *left, struct usb_port *right)
529{
530 struct usb_port *ss_port, *hs_port;
531
532 WARN(right->peer != left || left->peer != right,
533 "%s and %s are not peers?\n",
534 dev_name(&left->dev), dev_name(&right->dev));
535
536 /*
537 * We wake the HiSpeed port to make sure we don't race its
538 * usb_port_runtime_resume() event which takes a SuperSpeed ref
539 * when ->peer is !NULL.
540 */
541 if (left->is_superspeed) {
542 ss_port = left;
543 hs_port = right;
544 } else {
545 ss_port = right;
546 hs_port = left;
547 }
548
549 pm_runtime_get_sync(&hs_port->dev);
550
551 sysfs_remove_link(&left->dev.kobj, "peer");
552 right->peer = NULL;
553 sysfs_remove_link(&right->dev.kobj, "peer");
554 left->peer = NULL;
555
556 /* Drop the SuperSpeed ref held on behalf of the active HiSpeed port */
557 pm_runtime_put(&ss_port->dev);
558
559 /* Drop the ref taken above */
560 pm_runtime_put(&hs_port->dev);
561}
562
563/*
564 * For each usb hub device in the system check to see if it is in the
565 * peer domain of the given port_dev, and if it is check to see if it
566 * has a port that matches the given port by location
567 */
568static int match_location(struct usb_device *peer_hdev, void *p)
569{
570 int port1;
571 struct usb_hcd *hcd, *peer_hcd;
572 struct usb_port *port_dev = p, *peer;
573 struct usb_hub *peer_hub = usb_hub_to_struct_hub(peer_hdev);
574 struct usb_device *hdev = to_usb_device(port_dev->dev.parent->parent);
575
576 if (!peer_hub || port_dev->connect_type == USB_PORT_NOT_USED)
577 return 0;
578
579 hcd = bus_to_hcd(hdev->bus);
580 peer_hcd = bus_to_hcd(peer_hdev->bus);
581 /* peer_hcd is provisional until we verify it against the known peer */
582 if (peer_hcd != hcd->shared_hcd)
583 return 0;
584
585 for (port1 = 1; port1 <= peer_hdev->maxchild; port1++) {
586 peer = peer_hub->ports[port1 - 1];
587 if (peer && peer->connect_type != USB_PORT_NOT_USED &&
588 peer->location == port_dev->location) {
589 link_peers_report(port_dev, peer);
590 return 1; /* done */
591 }
592 }
593
594 return 0;
595}
596
597/*
598 * Find the peer port either via explicit platform firmware "location"
599 * data, the peer hcd for root hubs, or the upstream peer relationship
600 * for all other hubs.
601 */
602static void find_and_link_peer(struct usb_hub *hub, int port1)
603{
604 struct usb_port *port_dev = hub->ports[port1 - 1], *peer;
605 struct usb_device *hdev = hub->hdev;
606 struct usb_device *peer_hdev;
607 struct usb_hub *peer_hub;
608
609 /*
610 * If location data is available then we can only peer this port
611 * by a location match, not the default peer (lest we create a
612 * situation where we need to go back and undo a default peering
613 * when the port is later peered by location data)
614 */
615 if (port_dev->location) {
616 /* we link the peer in match_location() if found */
617 usb_for_each_dev(port_dev, match_location);
618 return;
619 } else if (!hdev->parent) {
620 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
621 struct usb_hcd *peer_hcd = hcd->shared_hcd;
622
623 if (!peer_hcd)
624 return;
625
626 peer_hdev = peer_hcd->self.root_hub;
627 } else {
628 struct usb_port *upstream;
629 struct usb_device *parent = hdev->parent;
630 struct usb_hub *parent_hub = usb_hub_to_struct_hub(parent);
631
632 if (!parent_hub)
633 return;
634
635 upstream = parent_hub->ports[hdev->portnum - 1];
636 if (!upstream || !upstream->peer)
637 return;
638
639 peer_hdev = upstream->peer->child;
640 }
641
642 peer_hub = usb_hub_to_struct_hub(peer_hdev);
643 if (!peer_hub || port1 > peer_hdev->maxchild)
644 return;
645
646 /*
647 * we found a valid default peer, last check is to make sure it
648 * does not have location data
649 */
650 peer = peer_hub->ports[port1 - 1];
651 if (peer && peer->location == 0)
652 link_peers_report(port_dev, peer);
653}
654
655static int connector_bind(struct device *dev, struct device *connector, void *data)
656{
657 struct usb_port *port_dev = to_usb_port(dev);
658 int ret;
659
660 ret = sysfs_create_link(&dev->kobj, &connector->kobj, "connector");
661 if (ret)
662 return ret;
663
664 ret = sysfs_create_link(&connector->kobj, &dev->kobj, dev_name(dev));
665 if (ret) {
666 sysfs_remove_link(&dev->kobj, "connector");
667 return ret;
668 }
669
670 port_dev->connector = data;
671
672 /*
673 * If there is already USB device connected to the port, letting the
674 * Type-C connector know about it immediately.
675 */
676 if (port_dev->child)
677 typec_attach(port_dev->connector, &port_dev->child->dev);
678
679 return 0;
680}
681
682static void connector_unbind(struct device *dev, struct device *connector, void *data)
683{
684 struct usb_port *port_dev = to_usb_port(dev);
685
686 sysfs_remove_link(&connector->kobj, dev_name(dev));
687 sysfs_remove_link(&dev->kobj, "connector");
688 port_dev->connector = NULL;
689}
690
691static const struct component_ops connector_ops = {
692 .bind = connector_bind,
693 .unbind = connector_unbind,
694};
695
696int usb_hub_create_port_device(struct usb_hub *hub, int port1)
697{
698 struct usb_port *port_dev;
699 struct usb_device *hdev = hub->hdev;
700 int retval;
701
702 port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
703 if (!port_dev)
704 return -ENOMEM;
705
706 port_dev->req = kzalloc(sizeof(*(port_dev->req)), GFP_KERNEL);
707 if (!port_dev->req) {
708 kfree(port_dev);
709 return -ENOMEM;
710 }
711
712 hub->ports[port1 - 1] = port_dev;
713 port_dev->portnum = port1;
714 set_bit(port1, hub->power_bits);
715 port_dev->dev.parent = hub->intfdev;
716 if (hub_is_superspeed(hdev)) {
717 port_dev->is_superspeed = 1;
718 port_dev->usb3_lpm_u1_permit = 1;
719 port_dev->usb3_lpm_u2_permit = 1;
720 port_dev->dev.groups = port_dev_usb3_group;
721 } else
722 port_dev->dev.groups = port_dev_group;
723 port_dev->dev.type = &usb_port_device_type;
724 port_dev->dev.driver = &usb_port_driver;
725 dev_set_name(&port_dev->dev, "%s-port%d", dev_name(&hub->hdev->dev),
726 port1);
727 mutex_init(&port_dev->status_lock);
728 retval = device_register(&port_dev->dev);
729 if (retval) {
730 put_device(&port_dev->dev);
731 return retval;
732 }
733
734 port_dev->state_kn = sysfs_get_dirent(port_dev->dev.kobj.sd, "state");
735 if (!port_dev->state_kn) {
736 dev_err(&port_dev->dev, "failed to sysfs_get_dirent 'state'\n");
737 retval = -ENODEV;
738 goto err_unregister;
739 }
740
741 /* Set default policy of port-poweroff disabled. */
742 retval = dev_pm_qos_add_request(&port_dev->dev, port_dev->req,
743 DEV_PM_QOS_FLAGS, PM_QOS_FLAG_NO_POWER_OFF);
744 if (retval < 0) {
745 goto err_put_kn;
746 }
747
748 retval = component_add(&port_dev->dev, &connector_ops);
749 if (retval) {
750 dev_warn(&port_dev->dev, "failed to add component\n");
751 goto err_put_kn;
752 }
753
754 find_and_link_peer(hub, port1);
755
756 /*
757 * Enable runtime pm and hold a refernce that hub_configure()
758 * will drop once the PM_QOS_NO_POWER_OFF flag state has been set
759 * and the hub has been fully registered (hdev->maxchild set).
760 */
761 pm_runtime_set_active(&port_dev->dev);
762 pm_runtime_get_noresume(&port_dev->dev);
763 pm_runtime_enable(&port_dev->dev);
764 device_enable_async_suspend(&port_dev->dev);
765
766 /*
767 * Keep hidden the ability to enable port-poweroff if the hub
768 * does not support power switching.
769 */
770 if (!hub_is_port_power_switchable(hub))
771 return 0;
772
773 /* Attempt to let userspace take over the policy. */
774 retval = dev_pm_qos_expose_flags(&port_dev->dev,
775 PM_QOS_FLAG_NO_POWER_OFF);
776 if (retval < 0) {
777 dev_warn(&port_dev->dev, "failed to expose pm_qos_no_poweroff\n");
778 return 0;
779 }
780
781 /* Userspace owns the policy, drop the kernel 'no_poweroff' request. */
782 retval = dev_pm_qos_remove_request(port_dev->req);
783 if (retval >= 0) {
784 kfree(port_dev->req);
785 port_dev->req = NULL;
786 }
787 return 0;
788
789err_put_kn:
790 sysfs_put(port_dev->state_kn);
791err_unregister:
792 device_unregister(&port_dev->dev);
793
794 return retval;
795}
796
797void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
798{
799 struct usb_port *port_dev = hub->ports[port1 - 1];
800 struct usb_port *peer;
801
802 peer = port_dev->peer;
803 if (peer)
804 unlink_peers(port_dev, peer);
805 component_del(&port_dev->dev, &connector_ops);
806 sysfs_put(port_dev->state_kn);
807 device_unregister(&port_dev->dev);
808}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * usb port device code
4 *
5 * Copyright (C) 2012 Intel Corp
6 *
7 * Author: Lan Tianyu <tianyu.lan@intel.com>
8 */
9
10#include <linux/kstrtox.h>
11#include <linux/slab.h>
12#include <linux/sysfs.h>
13#include <linux/pm_qos.h>
14#include <linux/component.h>
15#include <linux/usb/of.h>
16
17#include "hub.h"
18
19static int usb_port_block_power_off;
20
21static const struct attribute_group *port_dev_group[];
22
23static ssize_t early_stop_show(struct device *dev,
24 struct device_attribute *attr, char *buf)
25{
26 struct usb_port *port_dev = to_usb_port(dev);
27
28 return sysfs_emit(buf, "%s\n", port_dev->early_stop ? "yes" : "no");
29}
30
31static ssize_t early_stop_store(struct device *dev, struct device_attribute *attr,
32 const char *buf, size_t count)
33{
34 struct usb_port *port_dev = to_usb_port(dev);
35 bool value;
36
37 if (kstrtobool(buf, &value))
38 return -EINVAL;
39
40 if (value)
41 port_dev->early_stop = 1;
42 else
43 port_dev->early_stop = 0;
44
45 return count;
46}
47static DEVICE_ATTR_RW(early_stop);
48
49static ssize_t disable_show(struct device *dev,
50 struct device_attribute *attr, char *buf)
51{
52 struct usb_port *port_dev = to_usb_port(dev);
53 struct usb_device *hdev = to_usb_device(dev->parent->parent);
54 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
55 struct usb_interface *intf = to_usb_interface(dev->parent);
56 int port1 = port_dev->portnum;
57 u16 portstatus, unused;
58 bool disabled;
59 int rc;
60 struct kernfs_node *kn;
61
62 if (!hub)
63 return -ENODEV;
64 hub_get(hub);
65 rc = usb_autopm_get_interface(intf);
66 if (rc < 0)
67 goto out_hub_get;
68
69 /*
70 * Prevent deadlock if another process is concurrently
71 * trying to unregister hdev.
72 */
73 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
74 if (!kn) {
75 rc = -ENODEV;
76 goto out_autopm;
77 }
78 usb_lock_device(hdev);
79 if (hub->disconnected) {
80 rc = -ENODEV;
81 goto out_hdev_lock;
82 }
83
84 usb_hub_port_status(hub, port1, &portstatus, &unused);
85 disabled = !usb_port_is_power_on(hub, portstatus);
86
87 out_hdev_lock:
88 usb_unlock_device(hdev);
89 sysfs_unbreak_active_protection(kn);
90 out_autopm:
91 usb_autopm_put_interface(intf);
92 out_hub_get:
93 hub_put(hub);
94
95 if (rc)
96 return rc;
97
98 return sysfs_emit(buf, "%s\n", disabled ? "1" : "0");
99}
100
101static ssize_t disable_store(struct device *dev, struct device_attribute *attr,
102 const char *buf, size_t count)
103{
104 struct usb_port *port_dev = to_usb_port(dev);
105 struct usb_device *hdev = to_usb_device(dev->parent->parent);
106 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
107 struct usb_interface *intf = to_usb_interface(dev->parent);
108 int port1 = port_dev->portnum;
109 bool disabled;
110 int rc;
111 struct kernfs_node *kn;
112
113 if (!hub)
114 return -ENODEV;
115 rc = kstrtobool(buf, &disabled);
116 if (rc)
117 return rc;
118
119 hub_get(hub);
120 rc = usb_autopm_get_interface(intf);
121 if (rc < 0)
122 goto out_hub_get;
123
124 /*
125 * Prevent deadlock if another process is concurrently
126 * trying to unregister hdev.
127 */
128 kn = sysfs_break_active_protection(&dev->kobj, &attr->attr);
129 if (!kn) {
130 rc = -ENODEV;
131 goto out_autopm;
132 }
133 usb_lock_device(hdev);
134 if (hub->disconnected) {
135 rc = -ENODEV;
136 goto out_hdev_lock;
137 }
138
139 if (disabled && port_dev->child)
140 usb_disconnect(&port_dev->child);
141
142 rc = usb_hub_set_port_power(hdev, hub, port1, !disabled);
143
144 if (disabled) {
145 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
146 if (!port_dev->is_superspeed)
147 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
148 }
149
150 if (!rc)
151 rc = count;
152
153 out_hdev_lock:
154 usb_unlock_device(hdev);
155 sysfs_unbreak_active_protection(kn);
156 out_autopm:
157 usb_autopm_put_interface(intf);
158 out_hub_get:
159 hub_put(hub);
160
161 return rc;
162}
163static DEVICE_ATTR_RW(disable);
164
165static ssize_t location_show(struct device *dev,
166 struct device_attribute *attr, char *buf)
167{
168 struct usb_port *port_dev = to_usb_port(dev);
169
170 return sysfs_emit(buf, "0x%08x\n", port_dev->location);
171}
172static DEVICE_ATTR_RO(location);
173
174static ssize_t connect_type_show(struct device *dev,
175 struct device_attribute *attr, char *buf)
176{
177 struct usb_port *port_dev = to_usb_port(dev);
178 char *result;
179
180 switch (port_dev->connect_type) {
181 case USB_PORT_CONNECT_TYPE_HOT_PLUG:
182 result = "hotplug";
183 break;
184 case USB_PORT_CONNECT_TYPE_HARD_WIRED:
185 result = "hardwired";
186 break;
187 case USB_PORT_NOT_USED:
188 result = "not used";
189 break;
190 default:
191 result = "unknown";
192 break;
193 }
194
195 return sysfs_emit(buf, "%s\n", result);
196}
197static DEVICE_ATTR_RO(connect_type);
198
199static ssize_t state_show(struct device *dev,
200 struct device_attribute *attr, char *buf)
201{
202 struct usb_port *port_dev = to_usb_port(dev);
203 enum usb_device_state state = READ_ONCE(port_dev->state);
204
205 return sysfs_emit(buf, "%s\n", usb_state_string(state));
206}
207static DEVICE_ATTR_RO(state);
208
209static ssize_t over_current_count_show(struct device *dev,
210 struct device_attribute *attr, char *buf)
211{
212 struct usb_port *port_dev = to_usb_port(dev);
213
214 return sysfs_emit(buf, "%u\n", port_dev->over_current_count);
215}
216static DEVICE_ATTR_RO(over_current_count);
217
218static ssize_t quirks_show(struct device *dev,
219 struct device_attribute *attr, char *buf)
220{
221 struct usb_port *port_dev = to_usb_port(dev);
222
223 return sysfs_emit(buf, "%08x\n", port_dev->quirks);
224}
225
226static ssize_t quirks_store(struct device *dev, struct device_attribute *attr,
227 const char *buf, size_t count)
228{
229 struct usb_port *port_dev = to_usb_port(dev);
230 u32 value;
231
232 if (kstrtou32(buf, 16, &value))
233 return -EINVAL;
234
235 port_dev->quirks = value;
236 return count;
237}
238static DEVICE_ATTR_RW(quirks);
239
240static ssize_t usb3_lpm_permit_show(struct device *dev,
241 struct device_attribute *attr, char *buf)
242{
243 struct usb_port *port_dev = to_usb_port(dev);
244 const char *p;
245
246 if (port_dev->usb3_lpm_u1_permit) {
247 if (port_dev->usb3_lpm_u2_permit)
248 p = "u1_u2";
249 else
250 p = "u1";
251 } else {
252 if (port_dev->usb3_lpm_u2_permit)
253 p = "u2";
254 else
255 p = "0";
256 }
257
258 return sysfs_emit(buf, "%s\n", p);
259}
260
261static ssize_t usb3_lpm_permit_store(struct device *dev,
262 struct device_attribute *attr,
263 const char *buf, size_t count)
264{
265 struct usb_port *port_dev = to_usb_port(dev);
266 struct usb_device *udev = port_dev->child;
267 struct usb_hcd *hcd;
268
269 if (!strncmp(buf, "u1_u2", 5)) {
270 port_dev->usb3_lpm_u1_permit = 1;
271 port_dev->usb3_lpm_u2_permit = 1;
272
273 } else if (!strncmp(buf, "u1", 2)) {
274 port_dev->usb3_lpm_u1_permit = 1;
275 port_dev->usb3_lpm_u2_permit = 0;
276
277 } else if (!strncmp(buf, "u2", 2)) {
278 port_dev->usb3_lpm_u1_permit = 0;
279 port_dev->usb3_lpm_u2_permit = 1;
280
281 } else if (!strncmp(buf, "0", 1)) {
282 port_dev->usb3_lpm_u1_permit = 0;
283 port_dev->usb3_lpm_u2_permit = 0;
284 } else
285 return -EINVAL;
286
287 /* If device is connected to the port, disable or enable lpm
288 * to make new u1 u2 setting take effect immediately.
289 */
290 if (udev) {
291 hcd = bus_to_hcd(udev->bus);
292 if (!hcd)
293 return -EINVAL;
294 usb_lock_device(udev);
295 mutex_lock(hcd->bandwidth_mutex);
296 if (!usb_disable_lpm(udev))
297 usb_enable_lpm(udev);
298 mutex_unlock(hcd->bandwidth_mutex);
299 usb_unlock_device(udev);
300 }
301
302 return count;
303}
304static DEVICE_ATTR_RW(usb3_lpm_permit);
305
306static struct attribute *port_dev_attrs[] = {
307 &dev_attr_connect_type.attr,
308 &dev_attr_state.attr,
309 &dev_attr_location.attr,
310 &dev_attr_quirks.attr,
311 &dev_attr_over_current_count.attr,
312 &dev_attr_disable.attr,
313 &dev_attr_early_stop.attr,
314 NULL,
315};
316
317static const struct attribute_group port_dev_attr_grp = {
318 .attrs = port_dev_attrs,
319};
320
321static const struct attribute_group *port_dev_group[] = {
322 &port_dev_attr_grp,
323 NULL,
324};
325
326static struct attribute *port_dev_usb3_attrs[] = {
327 &dev_attr_usb3_lpm_permit.attr,
328 NULL,
329};
330
331static const struct attribute_group port_dev_usb3_attr_grp = {
332 .attrs = port_dev_usb3_attrs,
333};
334
335static const struct attribute_group *port_dev_usb3_group[] = {
336 &port_dev_attr_grp,
337 &port_dev_usb3_attr_grp,
338 NULL,
339};
340
341static void usb_port_device_release(struct device *dev)
342{
343 struct usb_port *port_dev = to_usb_port(dev);
344
345 kfree(port_dev->req);
346 kfree(port_dev);
347}
348
349#ifdef CONFIG_PM
350static int usb_port_runtime_resume(struct device *dev)
351{
352 struct usb_port *port_dev = to_usb_port(dev);
353 struct usb_device *hdev = to_usb_device(dev->parent->parent);
354 struct usb_interface *intf = to_usb_interface(dev->parent);
355 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
356 struct usb_device *udev = port_dev->child;
357 struct usb_port *peer = port_dev->peer;
358 int port1 = port_dev->portnum;
359 int retval;
360
361 if (!hub)
362 return -EINVAL;
363 if (hub->in_reset) {
364 set_bit(port1, hub->power_bits);
365 return 0;
366 }
367
368 /*
369 * Power on our usb3 peer before this usb2 port to prevent a usb3
370 * device from degrading to its usb2 connection
371 */
372 if (!port_dev->is_superspeed && peer)
373 pm_runtime_get_sync(&peer->dev);
374
375 retval = usb_autopm_get_interface(intf);
376 if (retval < 0)
377 return retval;
378
379 retval = usb_hub_set_port_power(hdev, hub, port1, true);
380 msleep(hub_power_on_good_delay(hub));
381 if (udev && !retval) {
382 /*
383 * Our preference is to simply wait for the port to reconnect,
384 * as that is the lowest latency method to restart the port.
385 * However, there are cases where toggling port power results in
386 * the host port and the device port getting out of sync causing
387 * a link training live lock. Upon timeout, flag the port as
388 * needing warm reset recovery (to be performed later by
389 * usb_port_resume() as requested via usb_wakeup_notification())
390 */
391 if (hub_port_debounce_be_connected(hub, port1) < 0) {
392 dev_dbg(&port_dev->dev, "reconnect timeout\n");
393 if (hub_is_superspeed(hdev))
394 set_bit(port1, hub->warm_reset_bits);
395 }
396
397 /* Force the child awake to revalidate after the power loss. */
398 if (!test_and_set_bit(port1, hub->child_usage_bits)) {
399 pm_runtime_get_noresume(&port_dev->dev);
400 pm_request_resume(&udev->dev);
401 }
402 }
403
404 usb_autopm_put_interface(intf);
405
406 return retval;
407}
408
409static int usb_port_runtime_suspend(struct device *dev)
410{
411 struct usb_port *port_dev = to_usb_port(dev);
412 struct usb_device *hdev = to_usb_device(dev->parent->parent);
413 struct usb_interface *intf = to_usb_interface(dev->parent);
414 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
415 struct usb_port *peer = port_dev->peer;
416 int port1 = port_dev->portnum;
417 int retval;
418
419 if (!hub)
420 return -EINVAL;
421 if (hub->in_reset)
422 return -EBUSY;
423
424 if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF)
425 == PM_QOS_FLAGS_ALL)
426 return -EAGAIN;
427
428 if (usb_port_block_power_off)
429 return -EBUSY;
430
431 retval = usb_autopm_get_interface(intf);
432 if (retval < 0)
433 return retval;
434
435 retval = usb_hub_set_port_power(hdev, hub, port1, false);
436 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
437 if (!port_dev->is_superspeed)
438 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
439 usb_autopm_put_interface(intf);
440
441 /*
442 * Our peer usb3 port may now be able to suspend, so
443 * asynchronously queue a suspend request to observe that this
444 * usb2 port is now off.
445 */
446 if (!port_dev->is_superspeed && peer)
447 pm_runtime_put(&peer->dev);
448
449 return retval;
450}
451#endif
452
453static void usb_port_shutdown(struct device *dev)
454{
455 struct usb_port *port_dev = to_usb_port(dev);
456 struct usb_device *udev = port_dev->child;
457
458 if (udev && !udev->port_is_suspended) {
459 usb_disable_usb2_hardware_lpm(udev);
460 usb_unlocked_disable_lpm(udev);
461 }
462}
463
464static const struct dev_pm_ops usb_port_pm_ops = {
465#ifdef CONFIG_PM
466 .runtime_suspend = usb_port_runtime_suspend,
467 .runtime_resume = usb_port_runtime_resume,
468#endif
469};
470
471const struct device_type usb_port_device_type = {
472 .name = "usb_port",
473 .release = usb_port_device_release,
474 .pm = &usb_port_pm_ops,
475};
476
477static struct device_driver usb_port_driver = {
478 .name = "usb",
479 .owner = THIS_MODULE,
480 .shutdown = usb_port_shutdown,
481};
482
483static int link_peers(struct usb_port *left, struct usb_port *right)
484{
485 struct usb_port *ss_port, *hs_port;
486 int rc;
487
488 if (left->peer == right && right->peer == left)
489 return 0;
490
491 if (left->peer || right->peer) {
492 struct usb_port *lpeer = left->peer;
493 struct usb_port *rpeer = right->peer;
494 char *method;
495
496 if (left->location && left->location == right->location)
497 method = "location";
498 else
499 method = "default";
500
501 pr_debug("usb: failed to peer %s and %s by %s (%s:%s) (%s:%s)\n",
502 dev_name(&left->dev), dev_name(&right->dev), method,
503 dev_name(&left->dev),
504 lpeer ? dev_name(&lpeer->dev) : "none",
505 dev_name(&right->dev),
506 rpeer ? dev_name(&rpeer->dev) : "none");
507 return -EBUSY;
508 }
509
510 rc = sysfs_create_link(&left->dev.kobj, &right->dev.kobj, "peer");
511 if (rc)
512 return rc;
513 rc = sysfs_create_link(&right->dev.kobj, &left->dev.kobj, "peer");
514 if (rc) {
515 sysfs_remove_link(&left->dev.kobj, "peer");
516 return rc;
517 }
518
519 /*
520 * We need to wake the HiSpeed port to make sure we don't race
521 * setting ->peer with usb_port_runtime_suspend(). Otherwise we
522 * may miss a suspend event for the SuperSpeed port.
523 */
524 if (left->is_superspeed) {
525 ss_port = left;
526 WARN_ON(right->is_superspeed);
527 hs_port = right;
528 } else {
529 ss_port = right;
530 WARN_ON(!right->is_superspeed);
531 hs_port = left;
532 }
533 pm_runtime_get_sync(&hs_port->dev);
534
535 left->peer = right;
536 right->peer = left;
537
538 /*
539 * The SuperSpeed reference is dropped when the HiSpeed port in
540 * this relationship suspends, i.e. when it is safe to allow a
541 * SuperSpeed connection to drop since there is no risk of a
542 * device degrading to its powered-off HiSpeed connection.
543 *
544 * Also, drop the HiSpeed ref taken above.
545 */
546 pm_runtime_get_sync(&ss_port->dev);
547 pm_runtime_put(&hs_port->dev);
548
549 return 0;
550}
551
552static void link_peers_report(struct usb_port *left, struct usb_port *right)
553{
554 int rc;
555
556 rc = link_peers(left, right);
557 if (rc == 0) {
558 dev_dbg(&left->dev, "peered to %s\n", dev_name(&right->dev));
559 } else {
560 dev_dbg(&left->dev, "failed to peer to %s (%d)\n",
561 dev_name(&right->dev), rc);
562 pr_warn_once("usb: port power management may be unreliable\n");
563 usb_port_block_power_off = 1;
564 }
565}
566
567static void unlink_peers(struct usb_port *left, struct usb_port *right)
568{
569 struct usb_port *ss_port, *hs_port;
570
571 WARN(right->peer != left || left->peer != right,
572 "%s and %s are not peers?\n",
573 dev_name(&left->dev), dev_name(&right->dev));
574
575 /*
576 * We wake the HiSpeed port to make sure we don't race its
577 * usb_port_runtime_resume() event which takes a SuperSpeed ref
578 * when ->peer is !NULL.
579 */
580 if (left->is_superspeed) {
581 ss_port = left;
582 hs_port = right;
583 } else {
584 ss_port = right;
585 hs_port = left;
586 }
587
588 pm_runtime_get_sync(&hs_port->dev);
589
590 sysfs_remove_link(&left->dev.kobj, "peer");
591 right->peer = NULL;
592 sysfs_remove_link(&right->dev.kobj, "peer");
593 left->peer = NULL;
594
595 /* Drop the SuperSpeed ref held on behalf of the active HiSpeed port */
596 pm_runtime_put(&ss_port->dev);
597
598 /* Drop the ref taken above */
599 pm_runtime_put(&hs_port->dev);
600}
601
602/*
603 * For each usb hub device in the system check to see if it is in the
604 * peer domain of the given port_dev, and if it is check to see if it
605 * has a port that matches the given port by location
606 */
607static int match_location(struct usb_device *peer_hdev, void *p)
608{
609 int port1;
610 struct usb_hcd *hcd, *peer_hcd;
611 struct usb_port *port_dev = p, *peer;
612 struct usb_hub *peer_hub = usb_hub_to_struct_hub(peer_hdev);
613 struct usb_device *hdev = to_usb_device(port_dev->dev.parent->parent);
614
615 if (!peer_hub || port_dev->connect_type == USB_PORT_NOT_USED)
616 return 0;
617
618 hcd = bus_to_hcd(hdev->bus);
619 peer_hcd = bus_to_hcd(peer_hdev->bus);
620 /* peer_hcd is provisional until we verify it against the known peer */
621 if (peer_hcd != hcd->shared_hcd)
622 return 0;
623
624 for (port1 = 1; port1 <= peer_hdev->maxchild; port1++) {
625 peer = peer_hub->ports[port1 - 1];
626 if (peer && peer->connect_type != USB_PORT_NOT_USED &&
627 peer->location == port_dev->location) {
628 link_peers_report(port_dev, peer);
629 return 1; /* done */
630 }
631 }
632
633 return 0;
634}
635
636/*
637 * Find the peer port either via explicit platform firmware "location"
638 * data, the peer hcd for root hubs, or the upstream peer relationship
639 * for all other hubs.
640 */
641static void find_and_link_peer(struct usb_hub *hub, int port1)
642{
643 struct usb_port *port_dev = hub->ports[port1 - 1], *peer;
644 struct usb_device *hdev = hub->hdev;
645 struct usb_device *peer_hdev;
646 struct usb_hub *peer_hub;
647
648 /*
649 * If location data is available then we can only peer this port
650 * by a location match, not the default peer (lest we create a
651 * situation where we need to go back and undo a default peering
652 * when the port is later peered by location data)
653 */
654 if (port_dev->location) {
655 /* we link the peer in match_location() if found */
656 usb_for_each_dev(port_dev, match_location);
657 return;
658 } else if (!hdev->parent) {
659 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
660 struct usb_hcd *peer_hcd = hcd->shared_hcd;
661
662 if (!peer_hcd)
663 return;
664
665 peer_hdev = peer_hcd->self.root_hub;
666 } else {
667 struct usb_port *upstream;
668 struct usb_device *parent = hdev->parent;
669 struct usb_hub *parent_hub = usb_hub_to_struct_hub(parent);
670
671 if (!parent_hub)
672 return;
673
674 upstream = parent_hub->ports[hdev->portnum - 1];
675 if (!upstream || !upstream->peer)
676 return;
677
678 peer_hdev = upstream->peer->child;
679 }
680
681 peer_hub = usb_hub_to_struct_hub(peer_hdev);
682 if (!peer_hub || port1 > peer_hdev->maxchild)
683 return;
684
685 /*
686 * we found a valid default peer, last check is to make sure it
687 * does not have location data
688 */
689 peer = peer_hub->ports[port1 - 1];
690 if (peer && peer->location == 0)
691 link_peers_report(port_dev, peer);
692}
693
694static int connector_bind(struct device *dev, struct device *connector, void *data)
695{
696 struct usb_port *port_dev = to_usb_port(dev);
697 int ret;
698
699 ret = sysfs_create_link(&dev->kobj, &connector->kobj, "connector");
700 if (ret)
701 return ret;
702
703 ret = sysfs_create_link(&connector->kobj, &dev->kobj, dev_name(dev));
704 if (ret) {
705 sysfs_remove_link(&dev->kobj, "connector");
706 return ret;
707 }
708
709 port_dev->connector = data;
710
711 /*
712 * If there is already USB device connected to the port, letting the
713 * Type-C connector know about it immediately.
714 */
715 if (port_dev->child)
716 typec_attach(port_dev->connector, &port_dev->child->dev);
717
718 return 0;
719}
720
721static void connector_unbind(struct device *dev, struct device *connector, void *data)
722{
723 struct usb_port *port_dev = to_usb_port(dev);
724
725 sysfs_remove_link(&connector->kobj, dev_name(dev));
726 sysfs_remove_link(&dev->kobj, "connector");
727 port_dev->connector = NULL;
728}
729
730static const struct component_ops connector_ops = {
731 .bind = connector_bind,
732 .unbind = connector_unbind,
733};
734
735int usb_hub_create_port_device(struct usb_hub *hub, int port1)
736{
737 struct usb_port *port_dev;
738 struct usb_device *hdev = hub->hdev;
739 int retval;
740
741 port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
742 if (!port_dev)
743 return -ENOMEM;
744
745 port_dev->req = kzalloc(sizeof(*(port_dev->req)), GFP_KERNEL);
746 if (!port_dev->req) {
747 kfree(port_dev);
748 return -ENOMEM;
749 }
750
751 port_dev->connect_type = usb_of_get_connect_type(hdev, port1);
752 hub->ports[port1 - 1] = port_dev;
753 port_dev->portnum = port1;
754 set_bit(port1, hub->power_bits);
755 port_dev->dev.parent = hub->intfdev;
756 if (hub_is_superspeed(hdev)) {
757 port_dev->is_superspeed = 1;
758 port_dev->usb3_lpm_u1_permit = 1;
759 port_dev->usb3_lpm_u2_permit = 1;
760 port_dev->dev.groups = port_dev_usb3_group;
761 } else
762 port_dev->dev.groups = port_dev_group;
763 port_dev->dev.type = &usb_port_device_type;
764 port_dev->dev.driver = &usb_port_driver;
765 dev_set_name(&port_dev->dev, "%s-port%d", dev_name(&hub->hdev->dev),
766 port1);
767 mutex_init(&port_dev->status_lock);
768 retval = device_register(&port_dev->dev);
769 if (retval) {
770 put_device(&port_dev->dev);
771 return retval;
772 }
773
774 port_dev->state_kn = sysfs_get_dirent(port_dev->dev.kobj.sd, "state");
775 if (!port_dev->state_kn) {
776 dev_err(&port_dev->dev, "failed to sysfs_get_dirent 'state'\n");
777 retval = -ENODEV;
778 goto err_unregister;
779 }
780
781 /* Set default policy of port-poweroff disabled. */
782 retval = dev_pm_qos_add_request(&port_dev->dev, port_dev->req,
783 DEV_PM_QOS_FLAGS, PM_QOS_FLAG_NO_POWER_OFF);
784 if (retval < 0) {
785 goto err_put_kn;
786 }
787
788 retval = component_add(&port_dev->dev, &connector_ops);
789 if (retval) {
790 dev_warn(&port_dev->dev, "failed to add component\n");
791 goto err_put_kn;
792 }
793
794 find_and_link_peer(hub, port1);
795
796 /*
797 * Enable runtime pm and hold a refernce that hub_configure()
798 * will drop once the PM_QOS_NO_POWER_OFF flag state has been set
799 * and the hub has been fully registered (hdev->maxchild set).
800 */
801 pm_runtime_set_active(&port_dev->dev);
802 pm_runtime_get_noresume(&port_dev->dev);
803 pm_runtime_enable(&port_dev->dev);
804 device_enable_async_suspend(&port_dev->dev);
805
806 /*
807 * Keep hidden the ability to enable port-poweroff if the hub
808 * does not support power switching.
809 */
810 if (!hub_is_port_power_switchable(hub))
811 return 0;
812
813 /* Attempt to let userspace take over the policy. */
814 retval = dev_pm_qos_expose_flags(&port_dev->dev,
815 PM_QOS_FLAG_NO_POWER_OFF);
816 if (retval < 0) {
817 dev_warn(&port_dev->dev, "failed to expose pm_qos_no_poweroff\n");
818 return 0;
819 }
820
821 /* Userspace owns the policy, drop the kernel 'no_poweroff' request. */
822 retval = dev_pm_qos_remove_request(port_dev->req);
823 if (retval >= 0) {
824 kfree(port_dev->req);
825 port_dev->req = NULL;
826 }
827 return 0;
828
829err_put_kn:
830 sysfs_put(port_dev->state_kn);
831err_unregister:
832 device_unregister(&port_dev->dev);
833
834 return retval;
835}
836
837void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
838{
839 struct usb_port *port_dev = hub->ports[port1 - 1];
840 struct usb_port *peer;
841
842 peer = port_dev->peer;
843 if (peer)
844 unlink_peers(port_dev, peer);
845 component_del(&port_dev->dev, &connector_ops);
846 sysfs_put(port_dev->state_kn);
847 device_unregister(&port_dev->dev);
848}