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