Commit | Line | Data |
---|---|---|
6e30d7cb LT |
1 | /* |
2 | * usb port device code | |
3 | * | |
4 | * Copyright (C) 2012 Intel Corp | |
5 | * | |
6 | * Author: Lan Tianyu <tianyu.lan@intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
14 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | * for more details. | |
16 | * | |
17 | */ | |
18 | ||
9f7344fb | 19 | #include <linux/slab.h> |
971fcd49 | 20 | #include <linux/pm_qos.h> |
9f7344fb | 21 | |
6e30d7cb LT |
22 | #include "hub.h" |
23 | ||
6c79fe4a DW |
24 | static int usb_port_block_power_off; |
25 | ||
cef7468c LT |
26 | static const struct attribute_group *port_dev_group[]; |
27 | ||
d03f254f GKH |
28 | static ssize_t connect_type_show(struct device *dev, |
29 | struct device_attribute *attr, char *buf) | |
cef7468c LT |
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 | } | |
d03f254f | 51 | static DEVICE_ATTR_RO(connect_type); |
cef7468c | 52 | |
513072d9 LB |
53 | static ssize_t usb3_lpm_permit_show(struct device *dev, |
54 | struct device_attribute *attr, char *buf) | |
55 | { | |
56 | struct usb_port *port_dev = to_usb_port(dev); | |
57 | const char *p; | |
58 | ||
59 | if (port_dev->usb3_lpm_u1_permit) { | |
60 | if (port_dev->usb3_lpm_u2_permit) | |
61 | p = "u1_u2"; | |
62 | else | |
63 | p = "u1"; | |
64 | } else { | |
65 | if (port_dev->usb3_lpm_u2_permit) | |
66 | p = "u2"; | |
67 | else | |
68 | p = "0"; | |
69 | } | |
70 | ||
71 | return sprintf(buf, "%s\n", p); | |
72 | } | |
73 | ||
74 | static ssize_t usb3_lpm_permit_store(struct device *dev, | |
75 | struct device_attribute *attr, | |
76 | const char *buf, size_t count) | |
77 | { | |
78 | struct usb_port *port_dev = to_usb_port(dev); | |
79 | struct usb_device *udev = port_dev->child; | |
80 | struct usb_hcd *hcd; | |
81 | ||
82 | if (!strncmp(buf, "u1_u2", 5)) { | |
83 | port_dev->usb3_lpm_u1_permit = 1; | |
84 | port_dev->usb3_lpm_u2_permit = 1; | |
85 | ||
86 | } else if (!strncmp(buf, "u1", 2)) { | |
87 | port_dev->usb3_lpm_u1_permit = 1; | |
88 | port_dev->usb3_lpm_u2_permit = 0; | |
89 | ||
90 | } else if (!strncmp(buf, "u2", 2)) { | |
91 | port_dev->usb3_lpm_u1_permit = 0; | |
92 | port_dev->usb3_lpm_u2_permit = 1; | |
93 | ||
94 | } else if (!strncmp(buf, "0", 1)) { | |
95 | port_dev->usb3_lpm_u1_permit = 0; | |
96 | port_dev->usb3_lpm_u2_permit = 0; | |
97 | } else | |
98 | return -EINVAL; | |
99 | ||
100 | /* If device is connected to the port, disable or enable lpm | |
101 | * to make new u1 u2 setting take effect immediately. | |
102 | */ | |
103 | if (udev) { | |
104 | hcd = bus_to_hcd(udev->bus); | |
105 | if (!hcd) | |
106 | return -EINVAL; | |
107 | usb_lock_device(udev); | |
108 | mutex_lock(hcd->bandwidth_mutex); | |
109 | if (!usb_disable_lpm(udev)) | |
110 | usb_enable_lpm(udev); | |
111 | mutex_unlock(hcd->bandwidth_mutex); | |
112 | usb_unlock_device(udev); | |
113 | } | |
114 | ||
115 | return count; | |
116 | } | |
117 | static DEVICE_ATTR_RW(usb3_lpm_permit); | |
118 | ||
cef7468c LT |
119 | static struct attribute *port_dev_attrs[] = { |
120 | &dev_attr_connect_type.attr, | |
121 | NULL, | |
122 | }; | |
123 | ||
124 | static struct attribute_group port_dev_attr_grp = { | |
125 | .attrs = port_dev_attrs, | |
126 | }; | |
127 | ||
128 | static const struct attribute_group *port_dev_group[] = { | |
129 | &port_dev_attr_grp, | |
130 | NULL, | |
131 | }; | |
132 | ||
513072d9 LB |
133 | static struct attribute *port_dev_usb3_attrs[] = { |
134 | &dev_attr_usb3_lpm_permit.attr, | |
135 | NULL, | |
136 | }; | |
137 | ||
138 | static struct attribute_group port_dev_usb3_attr_grp = { | |
139 | .attrs = port_dev_usb3_attrs, | |
140 | }; | |
141 | ||
142 | static const struct attribute_group *port_dev_usb3_group[] = { | |
143 | &port_dev_attr_grp, | |
144 | &port_dev_usb3_attr_grp, | |
145 | NULL, | |
146 | }; | |
147 | ||
6e30d7cb LT |
148 | static void usb_port_device_release(struct device *dev) |
149 | { | |
150 | struct usb_port *port_dev = to_usb_port(dev); | |
151 | ||
e3d10505 | 152 | kfree(port_dev->req); |
6e30d7cb LT |
153 | kfree(port_dev); |
154 | } | |
155 | ||
ceb6c9c8 | 156 | #ifdef CONFIG_PM |
971fcd49 LT |
157 | static int usb_port_runtime_resume(struct device *dev) |
158 | { | |
159 | struct usb_port *port_dev = to_usb_port(dev); | |
160 | struct usb_device *hdev = to_usb_device(dev->parent->parent); | |
161 | struct usb_interface *intf = to_usb_interface(dev->parent); | |
ad493e5e | 162 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
7027df36 | 163 | struct usb_device *udev = port_dev->child; |
7ad3c470 | 164 | struct usb_port *peer = port_dev->peer; |
ad493e5e | 165 | int port1 = port_dev->portnum; |
971fcd49 LT |
166 | int retval; |
167 | ||
ad493e5e LT |
168 | if (!hub) |
169 | return -EINVAL; | |
600856c2 | 170 | if (hub->in_reset) { |
d5c3834e | 171 | set_bit(port1, hub->power_bits); |
600856c2 AS |
172 | return 0; |
173 | } | |
ad493e5e | 174 | |
7ad3c470 DW |
175 | /* |
176 | * Power on our usb3 peer before this usb2 port to prevent a usb3 | |
177 | * device from degrading to its usb2 connection | |
178 | */ | |
179 | if (!port_dev->is_superspeed && peer) | |
180 | pm_runtime_get_sync(&peer->dev); | |
181 | ||
971fcd49 | 182 | usb_autopm_get_interface(intf); |
41341261 | 183 | retval = usb_hub_set_port_power(hdev, hub, port1, true); |
7ad3c470 | 184 | msleep(hub_power_on_good_delay(hub)); |
7027df36 | 185 | if (udev && !retval) { |
ad493e5e | 186 | /* |
3cd12f91 DW |
187 | * Our preference is to simply wait for the port to reconnect, |
188 | * as that is the lowest latency method to restart the port. | |
189 | * However, there are cases where toggling port power results in | |
190 | * the host port and the device port getting out of sync causing | |
191 | * a link training live lock. Upon timeout, flag the port as | |
192 | * needing warm reset recovery (to be performed later by | |
193 | * usb_port_resume() as requested via usb_wakeup_notification()) | |
ad493e5e | 194 | */ |
3cd12f91 DW |
195 | if (hub_port_debounce_be_connected(hub, port1) < 0) { |
196 | dev_dbg(&port_dev->dev, "reconnect timeout\n"); | |
197 | if (hub_is_superspeed(hdev)) | |
198 | set_bit(port1, hub->warm_reset_bits); | |
199 | } | |
7027df36 DW |
200 | |
201 | /* Force the child awake to revalidate after the power loss. */ | |
202 | if (!test_and_set_bit(port1, hub->child_usage_bits)) { | |
203 | pm_runtime_get_noresume(&port_dev->dev); | |
204 | pm_request_resume(&udev->dev); | |
205 | } | |
ad493e5e LT |
206 | } |
207 | ||
971fcd49 | 208 | usb_autopm_put_interface(intf); |
7ad3c470 | 209 | |
971fcd49 LT |
210 | return retval; |
211 | } | |
212 | ||
213 | static int usb_port_runtime_suspend(struct device *dev) | |
214 | { | |
215 | struct usb_port *port_dev = to_usb_port(dev); | |
216 | struct usb_device *hdev = to_usb_device(dev->parent->parent); | |
217 | struct usb_interface *intf = to_usb_interface(dev->parent); | |
ad493e5e | 218 | struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
7ad3c470 | 219 | struct usb_port *peer = port_dev->peer; |
ad493e5e | 220 | int port1 = port_dev->portnum; |
971fcd49 LT |
221 | int retval; |
222 | ||
ad493e5e LT |
223 | if (!hub) |
224 | return -EINVAL; | |
600856c2 AS |
225 | if (hub->in_reset) |
226 | return -EBUSY; | |
ad493e5e | 227 | |
971fcd49 LT |
228 | if (dev_pm_qos_flags(&port_dev->dev, PM_QOS_FLAG_NO_POWER_OFF) |
229 | == PM_QOS_FLAGS_ALL) | |
230 | return -EAGAIN; | |
231 | ||
6c79fe4a DW |
232 | if (usb_port_block_power_off) |
233 | return -EBUSY; | |
234 | ||
971fcd49 | 235 | usb_autopm_get_interface(intf); |
41341261 | 236 | retval = usb_hub_set_port_power(hdev, hub, port1, false); |
ad493e5e | 237 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); |
69080584 DW |
238 | if (!port_dev->is_superspeed) |
239 | usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); | |
971fcd49 | 240 | usb_autopm_put_interface(intf); |
7ad3c470 DW |
241 | |
242 | /* | |
243 | * Our peer usb3 port may now be able to suspend, so | |
244 | * asynchronously queue a suspend request to observe that this | |
245 | * usb2 port is now off. | |
246 | */ | |
247 | if (!port_dev->is_superspeed && peer) | |
248 | pm_runtime_put(&peer->dev); | |
249 | ||
971fcd49 LT |
250 | return retval; |
251 | } | |
252 | #endif | |
253 | ||
254 | static const struct dev_pm_ops usb_port_pm_ops = { | |
ceb6c9c8 | 255 | #ifdef CONFIG_PM |
971fcd49 LT |
256 | .runtime_suspend = usb_port_runtime_suspend, |
257 | .runtime_resume = usb_port_runtime_resume, | |
971fcd49 LT |
258 | #endif |
259 | }; | |
260 | ||
6e30d7cb LT |
261 | struct device_type usb_port_device_type = { |
262 | .name = "usb_port", | |
263 | .release = usb_port_device_release, | |
971fcd49 | 264 | .pm = &usb_port_pm_ops, |
6e30d7cb LT |
265 | }; |
266 | ||
d99f6b41 DW |
267 | static struct device_driver usb_port_driver = { |
268 | .name = "usb", | |
269 | .owner = THIS_MODULE, | |
270 | }; | |
271 | ||
b7e38eac | 272 | static int link_peers(struct usb_port *left, struct usb_port *right) |
d8521afe | 273 | { |
7ad3c470 | 274 | struct usb_port *ss_port, *hs_port; |
b7e38eac DW |
275 | int rc; |
276 | ||
d8521afe | 277 | if (left->peer == right && right->peer == left) |
b7e38eac | 278 | return 0; |
d8521afe DW |
279 | |
280 | if (left->peer || right->peer) { | |
281 | struct usb_port *lpeer = left->peer; | |
282 | struct usb_port *rpeer = right->peer; | |
6c79fe4a DW |
283 | char *method; |
284 | ||
285 | if (left->location && left->location == right->location) | |
286 | method = "location"; | |
287 | else | |
288 | method = "default"; | |
289 | ||
6406eeb3 | 290 | pr_debug("usb: failed to peer %s and %s by %s (%s:%s) (%s:%s)\n", |
6c79fe4a DW |
291 | dev_name(&left->dev), dev_name(&right->dev), method, |
292 | dev_name(&left->dev), | |
293 | lpeer ? dev_name(&lpeer->dev) : "none", | |
294 | dev_name(&right->dev), | |
295 | rpeer ? dev_name(&rpeer->dev) : "none"); | |
b7e38eac DW |
296 | return -EBUSY; |
297 | } | |
298 | ||
299 | rc = sysfs_create_link(&left->dev.kobj, &right->dev.kobj, "peer"); | |
300 | if (rc) | |
301 | return rc; | |
302 | rc = sysfs_create_link(&right->dev.kobj, &left->dev.kobj, "peer"); | |
303 | if (rc) { | |
304 | sysfs_remove_link(&left->dev.kobj, "peer"); | |
305 | return rc; | |
d8521afe DW |
306 | } |
307 | ||
7ad3c470 DW |
308 | /* |
309 | * We need to wake the HiSpeed port to make sure we don't race | |
310 | * setting ->peer with usb_port_runtime_suspend(). Otherwise we | |
311 | * may miss a suspend event for the SuperSpeed port. | |
312 | */ | |
313 | if (left->is_superspeed) { | |
314 | ss_port = left; | |
315 | WARN_ON(right->is_superspeed); | |
316 | hs_port = right; | |
317 | } else { | |
318 | ss_port = right; | |
319 | WARN_ON(!right->is_superspeed); | |
320 | hs_port = left; | |
321 | } | |
322 | pm_runtime_get_sync(&hs_port->dev); | |
323 | ||
d8521afe DW |
324 | left->peer = right; |
325 | right->peer = left; | |
b7e38eac | 326 | |
7ad3c470 DW |
327 | /* |
328 | * The SuperSpeed reference is dropped when the HiSpeed port in | |
329 | * this relationship suspends, i.e. when it is safe to allow a | |
330 | * SuperSpeed connection to drop since there is no risk of a | |
331 | * device degrading to its powered-off HiSpeed connection. | |
332 | * | |
333 | * Also, drop the HiSpeed ref taken above. | |
334 | */ | |
335 | pm_runtime_get_sync(&ss_port->dev); | |
336 | pm_runtime_put(&hs_port->dev); | |
337 | ||
b7e38eac DW |
338 | return 0; |
339 | } | |
340 | ||
341 | static void link_peers_report(struct usb_port *left, struct usb_port *right) | |
342 | { | |
343 | int rc; | |
344 | ||
345 | rc = link_peers(left, right); | |
346 | if (rc == 0) { | |
347 | dev_dbg(&left->dev, "peered to %s\n", dev_name(&right->dev)); | |
348 | } else { | |
6406eeb3 | 349 | dev_dbg(&left->dev, "failed to peer to %s (%d)\n", |
b7e38eac DW |
350 | dev_name(&right->dev), rc); |
351 | pr_warn_once("usb: port power management may be unreliable\n"); | |
6c79fe4a | 352 | usb_port_block_power_off = 1; |
b7e38eac | 353 | } |
d8521afe DW |
354 | } |
355 | ||
356 | static void unlink_peers(struct usb_port *left, struct usb_port *right) | |
357 | { | |
7ad3c470 DW |
358 | struct usb_port *ss_port, *hs_port; |
359 | ||
d8521afe DW |
360 | WARN(right->peer != left || left->peer != right, |
361 | "%s and %s are not peers?\n", | |
362 | dev_name(&left->dev), dev_name(&right->dev)); | |
363 | ||
7ad3c470 DW |
364 | /* |
365 | * We wake the HiSpeed port to make sure we don't race its | |
366 | * usb_port_runtime_resume() event which takes a SuperSpeed ref | |
367 | * when ->peer is !NULL. | |
368 | */ | |
369 | if (left->is_superspeed) { | |
370 | ss_port = left; | |
371 | hs_port = right; | |
372 | } else { | |
373 | ss_port = right; | |
374 | hs_port = left; | |
375 | } | |
376 | ||
377 | pm_runtime_get_sync(&hs_port->dev); | |
378 | ||
b7e38eac | 379 | sysfs_remove_link(&left->dev.kobj, "peer"); |
d8521afe | 380 | right->peer = NULL; |
b7e38eac | 381 | sysfs_remove_link(&right->dev.kobj, "peer"); |
d8521afe | 382 | left->peer = NULL; |
7ad3c470 DW |
383 | |
384 | /* Drop the SuperSpeed ref held on behalf of the active HiSpeed port */ | |
385 | pm_runtime_put(&ss_port->dev); | |
386 | ||
387 | /* Drop the ref taken above */ | |
388 | pm_runtime_put(&hs_port->dev); | |
d8521afe DW |
389 | } |
390 | ||
8b1ba80c | 391 | /* |
3bfd659b DW |
392 | * For each usb hub device in the system check to see if it is in the |
393 | * peer domain of the given port_dev, and if it is check to see if it | |
394 | * has a port that matches the given port by location | |
395 | */ | |
396 | static int match_location(struct usb_device *peer_hdev, void *p) | |
397 | { | |
398 | int port1; | |
399 | struct usb_hcd *hcd, *peer_hcd; | |
400 | struct usb_port *port_dev = p, *peer; | |
401 | struct usb_hub *peer_hub = usb_hub_to_struct_hub(peer_hdev); | |
402 | struct usb_device *hdev = to_usb_device(port_dev->dev.parent->parent); | |
403 | ||
404 | if (!peer_hub) | |
405 | return 0; | |
406 | ||
407 | hcd = bus_to_hcd(hdev->bus); | |
408 | peer_hcd = bus_to_hcd(peer_hdev->bus); | |
409 | /* peer_hcd is provisional until we verify it against the known peer */ | |
410 | if (peer_hcd != hcd->shared_hcd) | |
411 | return 0; | |
412 | ||
413 | for (port1 = 1; port1 <= peer_hdev->maxchild; port1++) { | |
414 | peer = peer_hub->ports[port1 - 1]; | |
415 | if (peer && peer->location == port_dev->location) { | |
b7e38eac | 416 | link_peers_report(port_dev, peer); |
3bfd659b DW |
417 | return 1; /* done */ |
418 | } | |
419 | } | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | /* | |
425 | * Find the peer port either via explicit platform firmware "location" | |
426 | * data, the peer hcd for root hubs, or the upstream peer relationship | |
427 | * for all other hubs. | |
8b1ba80c | 428 | */ |
d8521afe DW |
429 | static void find_and_link_peer(struct usb_hub *hub, int port1) |
430 | { | |
431 | struct usb_port *port_dev = hub->ports[port1 - 1], *peer; | |
432 | struct usb_device *hdev = hub->hdev; | |
8b1ba80c DW |
433 | struct usb_device *peer_hdev; |
434 | struct usb_hub *peer_hub; | |
d8521afe | 435 | |
3bfd659b DW |
436 | /* |
437 | * If location data is available then we can only peer this port | |
438 | * by a location match, not the default peer (lest we create a | |
439 | * situation where we need to go back and undo a default peering | |
440 | * when the port is later peered by location data) | |
441 | */ | |
442 | if (port_dev->location) { | |
443 | /* we link the peer in match_location() if found */ | |
444 | usb_for_each_dev(port_dev, match_location); | |
445 | return; | |
446 | } else if (!hdev->parent) { | |
d8521afe DW |
447 | struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
448 | struct usb_hcd *peer_hcd = hcd->shared_hcd; | |
449 | ||
450 | if (!peer_hcd) | |
451 | return; | |
452 | ||
453 | peer_hdev = peer_hcd->self.root_hub; | |
8b1ba80c DW |
454 | } else { |
455 | struct usb_port *upstream; | |
456 | struct usb_device *parent = hdev->parent; | |
457 | struct usb_hub *parent_hub = usb_hub_to_struct_hub(parent); | |
458 | ||
459 | if (!parent_hub) | |
d8521afe DW |
460 | return; |
461 | ||
8b1ba80c DW |
462 | upstream = parent_hub->ports[hdev->portnum - 1]; |
463 | if (!upstream || !upstream->peer) | |
464 | return; | |
d8521afe | 465 | |
8b1ba80c | 466 | peer_hdev = upstream->peer->child; |
d8521afe | 467 | } |
8b1ba80c DW |
468 | |
469 | peer_hub = usb_hub_to_struct_hub(peer_hdev); | |
470 | if (!peer_hub || port1 > peer_hdev->maxchild) | |
471 | return; | |
472 | ||
3bfd659b DW |
473 | /* |
474 | * we found a valid default peer, last check is to make sure it | |
475 | * does not have location data | |
476 | */ | |
8b1ba80c | 477 | peer = peer_hub->ports[port1 - 1]; |
3bfd659b | 478 | if (peer && peer->location == 0) |
b7e38eac | 479 | link_peers_report(port_dev, peer); |
d8521afe DW |
480 | } |
481 | ||
6e30d7cb LT |
482 | int usb_hub_create_port_device(struct usb_hub *hub, int port1) |
483 | { | |
d8521afe | 484 | struct usb_port *port_dev; |
513072d9 | 485 | struct usb_device *hdev = hub->hdev; |
6e30d7cb LT |
486 | int retval; |
487 | ||
488 | port_dev = kzalloc(sizeof(*port_dev), GFP_KERNEL); | |
e3d10505 DW |
489 | if (!port_dev) |
490 | return -ENOMEM; | |
491 | ||
492 | port_dev->req = kzalloc(sizeof(*(port_dev->req)), GFP_KERNEL); | |
493 | if (!port_dev->req) { | |
494 | kfree(port_dev); | |
495 | return -ENOMEM; | |
6e30d7cb LT |
496 | } |
497 | ||
498 | hub->ports[port1 - 1] = port_dev; | |
971fcd49 | 499 | port_dev->portnum = port1; |
d5c3834e | 500 | set_bit(port1, hub->power_bits); |
6e30d7cb | 501 | port_dev->dev.parent = hub->intfdev; |
513072d9 LB |
502 | if (hub_is_superspeed(hdev)) { |
503 | port_dev->usb3_lpm_u1_permit = 1; | |
504 | port_dev->usb3_lpm_u2_permit = 1; | |
505 | port_dev->dev.groups = port_dev_usb3_group; | |
506 | } else | |
507 | port_dev->dev.groups = port_dev_group; | |
6e30d7cb | 508 | port_dev->dev.type = &usb_port_device_type; |
d99f6b41 | 509 | port_dev->dev.driver = &usb_port_driver; |
7ad3c470 DW |
510 | if (hub_is_superspeed(hub->hdev)) |
511 | port_dev->is_superspeed = 1; | |
d99f6b41 DW |
512 | dev_set_name(&port_dev->dev, "%s-port%d", dev_name(&hub->hdev->dev), |
513 | port1); | |
5c79a1e3 | 514 | mutex_init(&port_dev->status_lock); |
6e30d7cb | 515 | retval = device_register(&port_dev->dev); |
e3d10505 DW |
516 | if (retval) { |
517 | put_device(&port_dev->dev); | |
518 | return retval; | |
519 | } | |
520 | ||
521 | /* Set default policy of port-poweroff disabled. */ | |
522 | retval = dev_pm_qos_add_request(&port_dev->dev, port_dev->req, | |
523 | DEV_PM_QOS_FLAGS, PM_QOS_FLAG_NO_POWER_OFF); | |
524 | if (retval < 0) { | |
525 | device_unregister(&port_dev->dev); | |
526 | return retval; | |
527 | } | |
6e30d7cb | 528 | |
d8521afe DW |
529 | find_and_link_peer(hub, port1); |
530 | ||
e3d10505 DW |
531 | /* |
532 | * Enable runtime pm and hold a refernce that hub_configure() | |
533 | * will drop once the PM_QOS_NO_POWER_OFF flag state has been set | |
534 | * and the hub has been fully registered (hdev->maxchild set). | |
535 | */ | |
971fcd49 | 536 | pm_runtime_set_active(&port_dev->dev); |
e3d10505 DW |
537 | pm_runtime_get_noresume(&port_dev->dev); |
538 | pm_runtime_enable(&port_dev->dev); | |
539 | device_enable_async_suspend(&port_dev->dev); | |
f6cced1a | 540 | |
9262c19d | 541 | /* |
e3d10505 DW |
542 | * Keep hidden the ability to enable port-poweroff if the hub |
543 | * does not support power switching. | |
f6cced1a | 544 | */ |
e3d10505 DW |
545 | if (!hub_is_port_power_switchable(hub)) |
546 | return 0; | |
f6cced1a | 547 | |
e3d10505 DW |
548 | /* Attempt to let userspace take over the policy. */ |
549 | retval = dev_pm_qos_expose_flags(&port_dev->dev, | |
550 | PM_QOS_FLAG_NO_POWER_OFF); | |
551 | if (retval < 0) { | |
552 | dev_warn(&port_dev->dev, "failed to expose pm_qos_no_poweroff\n"); | |
553 | return 0; | |
554 | } | |
6e30d7cb | 555 | |
e3d10505 DW |
556 | /* Userspace owns the policy, drop the kernel 'no_poweroff' request. */ |
557 | retval = dev_pm_qos_remove_request(port_dev->req); | |
558 | if (retval >= 0) { | |
559 | kfree(port_dev->req); | |
560 | port_dev->req = NULL; | |
561 | } | |
562 | return 0; | |
6e30d7cb LT |
563 | } |
564 | ||
d8521afe | 565 | void usb_hub_remove_port_device(struct usb_hub *hub, int port1) |
6e30d7cb | 566 | { |
d8521afe DW |
567 | struct usb_port *port_dev = hub->ports[port1 - 1]; |
568 | struct usb_port *peer; | |
6e30d7cb | 569 | |
d8521afe DW |
570 | peer = port_dev->peer; |
571 | if (peer) | |
572 | unlink_peers(port_dev, peer); | |
573 | device_unregister(&port_dev->dev); | |
574 | } |