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10#include <linux/slab.h>
11#include <linux/pm_qos.h>
12
13#include "hub.h"
14
15static int usb_port_block_power_off;
16
17static const struct attribute_group *port_dev_group[];
18
19static ssize_t location_show(struct device *dev,
20 struct device_attribute *attr, char *buf)
21{
22 struct usb_port *port_dev = to_usb_port(dev);
23
24 return sprintf(buf, "0x%08x\n", port_dev->location);
25}
26static DEVICE_ATTR_RO(location);
27
28static ssize_t connect_type_show(struct device *dev,
29 struct device_attribute *attr, char *buf)
30{
31 struct usb_port *port_dev = to_usb_port(dev);
32 char *result;
33
34 switch (port_dev->connect_type) {
35 case USB_PORT_CONNECT_TYPE_HOT_PLUG:
36 result = "hotplug";
37 break;
38 case USB_PORT_CONNECT_TYPE_HARD_WIRED:
39 result = "hardwired";
40 break;
41 case USB_PORT_NOT_USED:
42 result = "not used";
43 break;
44 default:
45 result = "unknown";
46 break;
47 }
48
49 return sprintf(buf, "%s\n", result);
50}
51static DEVICE_ATTR_RO(connect_type);
52
53static ssize_t over_current_count_show(struct device *dev,
54 struct device_attribute *attr, char *buf)
55{
56 struct usb_port *port_dev = to_usb_port(dev);
57
58 return sprintf(buf, "%u\n", port_dev->over_current_count);
59}
60static DEVICE_ATTR_RO(over_current_count);
61
62static ssize_t quirks_show(struct device *dev,
63 struct device_attribute *attr, char *buf)
64{
65 struct usb_port *port_dev = to_usb_port(dev);
66
67 return sprintf(buf, "%08x\n", port_dev->quirks);
68}
69
70static ssize_t quirks_store(struct device *dev, struct device_attribute *attr,
71 const char *buf, size_t count)
72{
73 struct usb_port *port_dev = to_usb_port(dev);
74 u32 value;
75
76 if (kstrtou32(buf, 16, &value))
77 return -EINVAL;
78
79 port_dev->quirks = value;
80 return count;
81}
82static DEVICE_ATTR_RW(quirks);
83
84static ssize_t usb3_lpm_permit_show(struct device *dev,
85 struct device_attribute *attr, char *buf)
86{
87 struct usb_port *port_dev = to_usb_port(dev);
88 const char *p;
89
90 if (port_dev->usb3_lpm_u1_permit) {
91 if (port_dev->usb3_lpm_u2_permit)
92 p = "u1_u2";
93 else
94 p = "u1";
95 } else {
96 if (port_dev->usb3_lpm_u2_permit)
97 p = "u2";
98 else
99 p = "0";
100 }
101
102 return sprintf(buf, "%s\n", p);
103}
104
105static ssize_t usb3_lpm_permit_store(struct device *dev,
106 struct device_attribute *attr,
107 const char *buf, size_t count)
108{
109 struct usb_port *port_dev = to_usb_port(dev);
110 struct usb_device *udev = port_dev->child;
111 struct usb_hcd *hcd;
112
113 if (!strncmp(buf, "u1_u2", 5)) {
114 port_dev->usb3_lpm_u1_permit = 1;
115 port_dev->usb3_lpm_u2_permit = 1;
116
117 } else if (!strncmp(buf, "u1", 2)) {
118 port_dev->usb3_lpm_u1_permit = 1;
119 port_dev->usb3_lpm_u2_permit = 0;
120
121 } else if (!strncmp(buf, "u2", 2)) {
122 port_dev->usb3_lpm_u1_permit = 0;
123 port_dev->usb3_lpm_u2_permit = 1;
124
125 } else if (!strncmp(buf, "0", 1)) {
126 port_dev->usb3_lpm_u1_permit = 0;
127 port_dev->usb3_lpm_u2_permit = 0;
128 } else
129 return -EINVAL;
130
131
132
133
134 if (udev) {
135 hcd = bus_to_hcd(udev->bus);
136 if (!hcd)
137 return -EINVAL;
138 usb_lock_device(udev);
139 mutex_lock(hcd->bandwidth_mutex);
140 if (!usb_disable_lpm(udev))
141 usb_enable_lpm(udev);
142 mutex_unlock(hcd->bandwidth_mutex);
143 usb_unlock_device(udev);
144 }
145
146 return count;
147}
148static DEVICE_ATTR_RW(usb3_lpm_permit);
149
150static struct attribute *port_dev_attrs[] = {
151 &dev_attr_connect_type.attr,
152 &dev_attr_location.attr,
153 &dev_attr_quirks.attr,
154 &dev_attr_over_current_count.attr,
155 NULL,
156};
157
158static struct attribute_group port_dev_attr_grp = {
159 .attrs = port_dev_attrs,
160};
161
162static const struct attribute_group *port_dev_group[] = {
163 &port_dev_attr_grp,
164 NULL,
165};
166
167static struct attribute *port_dev_usb3_attrs[] = {
168 &dev_attr_usb3_lpm_permit.attr,
169 NULL,
170};
171
172static struct attribute_group port_dev_usb3_attr_grp = {
173 .attrs = port_dev_usb3_attrs,
174};
175
176static const struct attribute_group *port_dev_usb3_group[] = {
177 &port_dev_attr_grp,
178 &port_dev_usb3_attr_grp,
179 NULL,
180};
181
182static void usb_port_device_release(struct device *dev)
183{
184 struct usb_port *port_dev = to_usb_port(dev);
185
186 kfree(port_dev->req);
187 kfree(port_dev);
188}
189
190#ifdef CONFIG_PM
191static int usb_port_runtime_resume(struct device *dev)
192{
193 struct usb_port *port_dev = to_usb_port(dev);
194 struct usb_device *hdev = to_usb_device(dev->parent->parent);
195 struct usb_interface *intf = to_usb_interface(dev->parent);
196 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
197 struct usb_device *udev = port_dev->child;
198 struct usb_port *peer = port_dev->peer;
199 int port1 = port_dev->portnum;
200 int retval;
201
202 if (!hub)
203 return -EINVAL;
204 if (hub->in_reset) {
205 set_bit(port1, hub->power_bits);
206 return 0;
207 }
208
209
210
211
212
213 if (!port_dev->is_superspeed && peer)
214 pm_runtime_get_sync(&peer->dev);
215
216 usb_autopm_get_interface(intf);
217 retval = usb_hub_set_port_power(hdev, hub, port1, true);
218 msleep(hub_power_on_good_delay(hub));
219 if (udev && !retval) {
220
221
222
223
224
225
226
227
228
229 if (hub_port_debounce_be_connected(hub, port1) < 0) {
230 dev_dbg(&port_dev->dev, "reconnect timeout\n");
231 if (hub_is_superspeed(hdev))
232 set_bit(port1, hub->warm_reset_bits);
233 }
234
235
236 if (!test_and_set_bit(port1, hub->child_usage_bits)) {
237 pm_runtime_get_noresume(&port_dev->dev);
238 pm_request_resume(&udev->dev);
239 }
240 }
241
242 usb_autopm_put_interface(intf);
243
244 return retval;
245}
246
247static int usb_port_runtime_suspend(struct device *dev)
248{
249 struct usb_port *port_dev = to_usb_port(dev);
250 struct usb_device *hdev = to_usb_device(dev->parent->parent);
251 struct usb_interface *intf = to_usb_interface(dev->parent);
252 struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
253 struct usb_port *peer = port_dev->peer;
254 int port1 = port_dev->portnum;
255 int retval;
256
257 if (!hub)
258 return -EINVAL;
259 if (hub->in_reset)
260 return -EBUSY;
261
262 if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF)
263 == PM_QOS_FLAGS_ALL)
264 return -EAGAIN;
265
266 if (usb_port_block_power_off)
267 return -EBUSY;
268
269 usb_autopm_get_interface(intf);
270 retval = usb_hub_set_port_power(hdev, hub, port1, false);
271 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
272 if (!port_dev->is_superspeed)
273 usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
274 usb_autopm_put_interface(intf);
275
276
277
278
279
280
281 if (!port_dev->is_superspeed && peer)
282 pm_runtime_put(&peer->dev);
283
284 return retval;
285}
286#endif
287
288static const struct dev_pm_ops usb_port_pm_ops = {
289#ifdef CONFIG_PM
290 .runtime_suspend = usb_port_runtime_suspend,
291 .runtime_resume = usb_port_runtime_resume,
292#endif
293};
294
295struct device_type usb_port_device_type = {
296 .name = "usb_port",
297 .release = usb_port_device_release,
298 .pm = &usb_port_pm_ops,
299};
300
301static struct device_driver usb_port_driver = {
302 .name = "usb",
303 .owner = THIS_MODULE,
304};
305
306static int link_peers(struct usb_port *left, struct usb_port *right)
307{
308 struct usb_port *ss_port, *hs_port;
309 int rc;
310
311 if (left->peer == right && right->peer == left)
312 return 0;
313
314 if (left->peer || right->peer) {
315 struct usb_port *lpeer = left->peer;
316 struct usb_port *rpeer = right->peer;
317 char *method;
318
319 if (left->location && left->location == right->location)
320 method = "location";
321 else
322 method = "default";
323
324 pr_debug("usb: failed to peer %s and %s by %s (%s:%s) (%s:%s)\n",
325 dev_name(&left->dev), dev_name(&right->dev), method,
326 dev_name(&left->dev),
327 lpeer ? dev_name(&lpeer->dev) : "none",
328 dev_name(&right->dev),
329 rpeer ? dev_name(&rpeer->dev) : "none");
330 return -EBUSY;
331 }
332
333 rc = sysfs_create_link(&left->dev.kobj, &right->dev.kobj, "peer");
334 if (rc)
335 return rc;
336 rc = sysfs_create_link(&right->dev.kobj, &left->dev.kobj, "peer");
337 if (rc) {
338 sysfs_remove_link(&left->dev.kobj, "peer");
339 return rc;
340 }
341
342
343
344
345
346
347 if (left->is_superspeed) {
348 ss_port = left;
349 WARN_ON(right->is_superspeed);
350 hs_port = right;
351 } else {
352 ss_port = right;
353 WARN_ON(!right->is_superspeed);
354 hs_port = left;
355 }
356 pm_runtime_get_sync(&hs_port->dev);
357
358 left->peer = right;
359 right->peer = left;
360
361
362
363
364
365
366
367
368
369 pm_runtime_get_sync(&ss_port->dev);
370 pm_runtime_put(&hs_port->dev);
371
372 return 0;
373}
374
375static void link_peers_report(struct usb_port *left, struct usb_port *right)
376{
377 int rc;
378
379 rc = link_peers(left, right);
380 if (rc == 0) {
381 dev_dbg(&left->dev, "peered to %s\n", dev_name(&right->dev));
382 } else {
383 dev_dbg(&left->dev, "failed to peer to %s (%d)\n",
384 dev_name(&right->dev), rc);
385 pr_warn_once("usb: port power management may be unreliable\n");
386 usb_port_block_power_off = 1;
387 }
388}
389
390static void unlink_peers(struct usb_port *left, struct usb_port *right)
391{
392 struct usb_port *ss_port, *hs_port;
393
394 WARN(right->peer != left || left->peer != right,
395 "%s and %s are not peers?\n",
396 dev_name(&left->dev), dev_name(&right->dev));
397
398
399
400
401
402
403 if (left->is_superspeed) {
404 ss_port = left;
405 hs_port = right;
406 } else {
407 ss_port = right;
408 hs_port = left;
409 }
410
411 pm_runtime_get_sync(&hs_port->dev);
412
413 sysfs_remove_link(&left->dev.kobj, "peer");
414 right->peer = NULL;
415 sysfs_remove_link(&right->dev.kobj, "peer");
416 left->peer = NULL;
417
418
419 pm_runtime_put(&ss_port->dev);
420
421
422 pm_runtime_put(&hs_port->dev);
423}
424
425
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427
428
429
430static int match_location(struct usb_device *peer_hdev, void *p)
431{
432 int port1;
433 struct usb_hcd *hcd, *peer_hcd;
434 struct usb_port *port_dev = p, *peer;
435 struct usb_hub *peer_hub = usb_hub_to_struct_hub(peer_hdev);
436 struct usb_device *hdev = to_usb_device(port_dev->dev.parent->parent);
437
438 if (!peer_hub)
439 return 0;
440
441 hcd = bus_to_hcd(hdev->bus);
442 peer_hcd = bus_to_hcd(peer_hdev->bus);
443
444 if (peer_hcd != hcd->shared_hcd)
445 return 0;
446
447 for (port1 = 1; port1 <= peer_hdev->maxchild; port1++) {
448 peer = peer_hub->ports[port1 - 1];
449 if (peer && peer->location == port_dev->location) {
450 link_peers_report(port_dev, peer);
451 return 1;
452 }
453 }
454
455 return 0;
456}
457
458
459
460
461
462
463static void find_and_link_peer(struct usb_hub *hub, int port1)
464{
465 struct usb_port *port_dev = hub->ports[port1 - 1], *peer;
466 struct usb_device *hdev = hub->hdev;
467 struct usb_device *peer_hdev;
468 struct usb_hub *peer_hub;
469
470
471
472
473
474
475
476 if (port_dev->location) {
477
478 usb_for_each_dev(port_dev, match_location);
479 return;
480 } else if (!hdev->parent) {
481 struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
482 struct usb_hcd *peer_hcd = hcd->shared_hcd;
483
484 if (!peer_hcd)
485 return;
486
487 peer_hdev = peer_hcd->self.root_hub;
488 } else {
489 struct usb_port *upstream;
490 struct usb_device *parent = hdev->parent;
491 struct usb_hub *parent_hub = usb_hub_to_struct_hub(parent);
492
493 if (!parent_hub)
494 return;
495
496 upstream = parent_hub->ports[hdev->portnum - 1];
497 if (!upstream || !upstream->peer)
498 return;
499
500 peer_hdev = upstream->peer->child;
501 }
502
503 peer_hub = usb_hub_to_struct_hub(peer_hdev);
504 if (!peer_hub || port1 > peer_hdev->maxchild)
505 return;
506
507
508
509
510
511 peer = peer_hub->ports[port1 - 1];
512 if (peer && peer->location == 0)
513 link_peers_report(port_dev, peer);
514}
515
516int usb_hub_create_port_device(struct usb_hub *hub, int port1)
517{
518 struct usb_port *port_dev;
519 struct usb_device *hdev = hub->hdev;
520 int retval;
521
522 port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL);
523 if (!port_dev)
524 return -ENOMEM;
525
526 port_dev->req = kzalloc(sizeof(*(port_dev->req)), GFP_KERNEL);
527 if (!port_dev->req) {
528 kfree(port_dev);
529 return -ENOMEM;
530 }
531
532 hub->ports[port1 - 1] = port_dev;
533 port_dev->portnum = port1;
534 set_bit(port1, hub->power_bits);
535 port_dev->dev.parent = hub->intfdev;
536 if (hub_is_superspeed(hdev)) {
537 port_dev->usb3_lpm_u1_permit = 1;
538 port_dev->usb3_lpm_u2_permit = 1;
539 port_dev->dev.groups = port_dev_usb3_group;
540 } else
541 port_dev->dev.groups = port_dev_group;
542 port_dev->dev.type = &usb_port_device_type;
543 port_dev->dev.driver = &usb_port_driver;
544 if (hub_is_superspeed(hub->hdev))
545 port_dev->is_superspeed = 1;
546 dev_set_name(&port_dev->dev, "%s-port%d", dev_name(&hub->hdev->dev),
547 port1);
548 mutex_init(&port_dev->status_lock);
549 retval = device_register(&port_dev->dev);
550 if (retval) {
551 put_device(&port_dev->dev);
552 return retval;
553 }
554
555
556 retval = dev_pm_qos_add_request(&port_dev->dev, port_dev->req,
557 DEV_PM_QOS_FLAGS, PM_QOS_FLAG_NO_POWER_OFF);
558 if (retval < 0) {
559 device_unregister(&port_dev->dev);
560 return retval;
561 }
562
563 find_and_link_peer(hub, port1);
564
565
566
567
568
569
570 pm_runtime_set_active(&port_dev->dev);
571 pm_runtime_get_noresume(&port_dev->dev);
572 pm_runtime_enable(&port_dev->dev);
573 device_enable_async_suspend(&port_dev->dev);
574
575
576
577
578
579 if (!hub_is_port_power_switchable(hub))
580 return 0;
581
582
583 retval = dev_pm_qos_expose_flags(&port_dev->dev,
584 PM_QOS_FLAG_NO_POWER_OFF);
585 if (retval < 0) {
586 dev_warn(&port_dev->dev, "failed to expose pm_qos_no_poweroff\n");
587 return 0;
588 }
589
590
591 retval = dev_pm_qos_remove_request(port_dev->req);
592 if (retval >= 0) {
593 kfree(port_dev->req);
594 port_dev->req = NULL;
595 }
596 return 0;
597}
598
599void usb_hub_remove_port_device(struct usb_hub *hub, int port1)
600{
601 struct usb_port *port_dev = hub->ports[port1 - 1];
602 struct usb_port *peer;
603
604 peer = port_dev->peer;
605 if (peer)
606 unlink_peers(port_dev, peer);
607 device_unregister(&port_dev->dev);
608}
609