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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * phy.c -- USB phy handling
4 *
5 * Copyright (C) 2004-2013 Texas Instruments
6 */
7#include <linux/kernel.h>
8#include <linux/export.h>
9#include <linux/err.h>
10#include <linux/device.h>
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/of.h>
14
15#include <linux/usb/phy.h>
16
17/* Default current range by charger type. */
18#define DEFAULT_SDP_CUR_MIN 2
19#define DEFAULT_SDP_CUR_MAX 500
20#define DEFAULT_SDP_CUR_MIN_SS 150
21#define DEFAULT_SDP_CUR_MAX_SS 900
22#define DEFAULT_DCP_CUR_MIN 500
23#define DEFAULT_DCP_CUR_MAX 5000
24#define DEFAULT_CDP_CUR_MIN 1500
25#define DEFAULT_CDP_CUR_MAX 5000
26#define DEFAULT_ACA_CUR_MIN 1500
27#define DEFAULT_ACA_CUR_MAX 5000
28
29static LIST_HEAD(phy_list);
30static DEFINE_SPINLOCK(phy_lock);
31
32struct phy_devm {
33 struct usb_phy *phy;
34 struct notifier_block *nb;
35};
36
37static const char *const usb_chger_type[] = {
38 [UNKNOWN_TYPE] = "USB_CHARGER_UNKNOWN_TYPE",
39 [SDP_TYPE] = "USB_CHARGER_SDP_TYPE",
40 [CDP_TYPE] = "USB_CHARGER_CDP_TYPE",
41 [DCP_TYPE] = "USB_CHARGER_DCP_TYPE",
42 [ACA_TYPE] = "USB_CHARGER_ACA_TYPE",
43};
44
45static const char *const usb_chger_state[] = {
46 [USB_CHARGER_DEFAULT] = "USB_CHARGER_DEFAULT",
47 [USB_CHARGER_PRESENT] = "USB_CHARGER_PRESENT",
48 [USB_CHARGER_ABSENT] = "USB_CHARGER_ABSENT",
49};
50
51static struct usb_phy *__usb_find_phy(struct list_head *list,
52 enum usb_phy_type type)
53{
54 struct usb_phy *phy = NULL;
55
56 list_for_each_entry(phy, list, head) {
57 if (phy->type != type)
58 continue;
59
60 return phy;
61 }
62
63 return ERR_PTR(-ENODEV);
64}
65
66static struct usb_phy *__of_usb_find_phy(struct device_node *node)
67{
68 struct usb_phy *phy;
69
70 if (!of_device_is_available(node))
71 return ERR_PTR(-ENODEV);
72
73 list_for_each_entry(phy, &phy_list, head) {
74 if (node != phy->dev->of_node)
75 continue;
76
77 return phy;
78 }
79
80 return ERR_PTR(-EPROBE_DEFER);
81}
82
83static struct usb_phy *__device_to_usb_phy(const struct device *dev)
84{
85 struct usb_phy *usb_phy;
86
87 list_for_each_entry(usb_phy, &phy_list, head) {
88 if (usb_phy->dev == dev)
89 return usb_phy;
90 }
91
92 return NULL;
93}
94
95static void usb_phy_set_default_current(struct usb_phy *usb_phy)
96{
97 usb_phy->chg_cur.sdp_min = DEFAULT_SDP_CUR_MIN;
98 usb_phy->chg_cur.sdp_max = DEFAULT_SDP_CUR_MAX;
99 usb_phy->chg_cur.dcp_min = DEFAULT_DCP_CUR_MIN;
100 usb_phy->chg_cur.dcp_max = DEFAULT_DCP_CUR_MAX;
101 usb_phy->chg_cur.cdp_min = DEFAULT_CDP_CUR_MIN;
102 usb_phy->chg_cur.cdp_max = DEFAULT_CDP_CUR_MAX;
103 usb_phy->chg_cur.aca_min = DEFAULT_ACA_CUR_MIN;
104 usb_phy->chg_cur.aca_max = DEFAULT_ACA_CUR_MAX;
105}
106
107/**
108 * usb_phy_notify_charger_work - notify the USB charger state
109 * @work: the charger work to notify the USB charger state
110 *
111 * This work can be issued when USB charger state has been changed or
112 * USB charger current has been changed, then we can notify the current
113 * what can be drawn to power user and the charger state to userspace.
114 *
115 * If we get the charger type from extcon subsystem, we can notify the
116 * charger state to power user automatically by usb_phy_get_charger_type()
117 * issuing from extcon subsystem.
118 *
119 * If we get the charger type from ->charger_detect() instead of extcon
120 * subsystem, the usb phy driver should issue usb_phy_set_charger_state()
121 * to set charger state when the charger state has been changed.
122 */
123static void usb_phy_notify_charger_work(struct work_struct *work)
124{
125 struct usb_phy *usb_phy = container_of(work, struct usb_phy, chg_work);
126 unsigned int min, max;
127
128 switch (usb_phy->chg_state) {
129 case USB_CHARGER_PRESENT:
130 usb_phy_get_charger_current(usb_phy, &min, &max);
131
132 atomic_notifier_call_chain(&usb_phy->notifier, max, usb_phy);
133 break;
134 case USB_CHARGER_ABSENT:
135 usb_phy_set_default_current(usb_phy);
136
137 atomic_notifier_call_chain(&usb_phy->notifier, 0, usb_phy);
138 break;
139 default:
140 dev_warn(usb_phy->dev, "Unknown USB charger state: %d\n",
141 usb_phy->chg_state);
142 return;
143 }
144
145 kobject_uevent(&usb_phy->dev->kobj, KOBJ_CHANGE);
146}
147
148static int usb_phy_uevent(const struct device *dev, struct kobj_uevent_env *env)
149{
150 const struct usb_phy *usb_phy;
151 char uchger_state[50] = { 0 };
152 char uchger_type[50] = { 0 };
153 unsigned long flags;
154
155 spin_lock_irqsave(&phy_lock, flags);
156 usb_phy = __device_to_usb_phy(dev);
157 spin_unlock_irqrestore(&phy_lock, flags);
158
159 if (!usb_phy)
160 return -ENODEV;
161
162 snprintf(uchger_state, ARRAY_SIZE(uchger_state),
163 "USB_CHARGER_STATE=%s", usb_chger_state[usb_phy->chg_state]);
164
165 snprintf(uchger_type, ARRAY_SIZE(uchger_type),
166 "USB_CHARGER_TYPE=%s", usb_chger_type[usb_phy->chg_type]);
167
168 if (add_uevent_var(env, uchger_state))
169 return -ENOMEM;
170
171 if (add_uevent_var(env, uchger_type))
172 return -ENOMEM;
173
174 return 0;
175}
176
177static void __usb_phy_get_charger_type(struct usb_phy *usb_phy)
178{
179 if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_SDP) > 0) {
180 usb_phy->chg_type = SDP_TYPE;
181 usb_phy->chg_state = USB_CHARGER_PRESENT;
182 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_CDP) > 0) {
183 usb_phy->chg_type = CDP_TYPE;
184 usb_phy->chg_state = USB_CHARGER_PRESENT;
185 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_DCP) > 0) {
186 usb_phy->chg_type = DCP_TYPE;
187 usb_phy->chg_state = USB_CHARGER_PRESENT;
188 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_ACA) > 0) {
189 usb_phy->chg_type = ACA_TYPE;
190 usb_phy->chg_state = USB_CHARGER_PRESENT;
191 } else {
192 usb_phy->chg_type = UNKNOWN_TYPE;
193 usb_phy->chg_state = USB_CHARGER_ABSENT;
194 }
195
196 schedule_work(&usb_phy->chg_work);
197}
198
199/**
200 * usb_phy_get_charger_type - get charger type from extcon subsystem
201 * @nb: the notifier block to determine charger type
202 * @state: the cable state
203 * @data: private data
204 *
205 * Determin the charger type from extcon subsystem which also means the
206 * charger state has been chaned, then we should notify this event.
207 */
208static int usb_phy_get_charger_type(struct notifier_block *nb,
209 unsigned long state, void *data)
210{
211 struct usb_phy *usb_phy = container_of(nb, struct usb_phy, type_nb);
212
213 __usb_phy_get_charger_type(usb_phy);
214 return NOTIFY_OK;
215}
216
217/**
218 * usb_phy_set_charger_current - set the USB charger current
219 * @usb_phy: the USB phy to be used
220 * @mA: the current need to be set
221 *
222 * Usually we only change the charger default current when USB finished the
223 * enumeration as one SDP charger. As one SDP charger, usb_phy_set_power()
224 * will issue this function to change charger current when after setting USB
225 * configuration, or suspend/resume USB. For other type charger, we should
226 * use the default charger current and we do not suggest to issue this function
227 * to change the charger current.
228 *
229 * When USB charger current has been changed, we need to notify the power users.
230 */
231void usb_phy_set_charger_current(struct usb_phy *usb_phy, unsigned int mA)
232{
233 switch (usb_phy->chg_type) {
234 case SDP_TYPE:
235 if (usb_phy->chg_cur.sdp_max == mA)
236 return;
237
238 usb_phy->chg_cur.sdp_max = (mA > DEFAULT_SDP_CUR_MAX_SS) ?
239 DEFAULT_SDP_CUR_MAX_SS : mA;
240 break;
241 case DCP_TYPE:
242 if (usb_phy->chg_cur.dcp_max == mA)
243 return;
244
245 usb_phy->chg_cur.dcp_max = (mA > DEFAULT_DCP_CUR_MAX) ?
246 DEFAULT_DCP_CUR_MAX : mA;
247 break;
248 case CDP_TYPE:
249 if (usb_phy->chg_cur.cdp_max == mA)
250 return;
251
252 usb_phy->chg_cur.cdp_max = (mA > DEFAULT_CDP_CUR_MAX) ?
253 DEFAULT_CDP_CUR_MAX : mA;
254 break;
255 case ACA_TYPE:
256 if (usb_phy->chg_cur.aca_max == mA)
257 return;
258
259 usb_phy->chg_cur.aca_max = (mA > DEFAULT_ACA_CUR_MAX) ?
260 DEFAULT_ACA_CUR_MAX : mA;
261 break;
262 default:
263 return;
264 }
265
266 schedule_work(&usb_phy->chg_work);
267}
268EXPORT_SYMBOL_GPL(usb_phy_set_charger_current);
269
270/**
271 * usb_phy_get_charger_current - get the USB charger current
272 * @usb_phy: the USB phy to be used
273 * @min: the minimum current
274 * @max: the maximum current
275 *
276 * Usually we will notify the maximum current to power user, but for some
277 * special case, power user also need the minimum current value. Then the
278 * power user can issue this function to get the suitable current.
279 */
280void usb_phy_get_charger_current(struct usb_phy *usb_phy,
281 unsigned int *min, unsigned int *max)
282{
283 switch (usb_phy->chg_type) {
284 case SDP_TYPE:
285 *min = usb_phy->chg_cur.sdp_min;
286 *max = usb_phy->chg_cur.sdp_max;
287 break;
288 case DCP_TYPE:
289 *min = usb_phy->chg_cur.dcp_min;
290 *max = usb_phy->chg_cur.dcp_max;
291 break;
292 case CDP_TYPE:
293 *min = usb_phy->chg_cur.cdp_min;
294 *max = usb_phy->chg_cur.cdp_max;
295 break;
296 case ACA_TYPE:
297 *min = usb_phy->chg_cur.aca_min;
298 *max = usb_phy->chg_cur.aca_max;
299 break;
300 default:
301 *min = 0;
302 *max = 0;
303 break;
304 }
305}
306EXPORT_SYMBOL_GPL(usb_phy_get_charger_current);
307
308/**
309 * usb_phy_set_charger_state - set the USB charger state
310 * @usb_phy: the USB phy to be used
311 * @state: the new state need to be set for charger
312 *
313 * The usb phy driver can issue this function when the usb phy driver
314 * detected the charger state has been changed, in this case the charger
315 * type should be get from ->charger_detect().
316 */
317void usb_phy_set_charger_state(struct usb_phy *usb_phy,
318 enum usb_charger_state state)
319{
320 if (usb_phy->chg_state == state || !usb_phy->charger_detect)
321 return;
322
323 usb_phy->chg_state = state;
324 if (usb_phy->chg_state == USB_CHARGER_PRESENT)
325 usb_phy->chg_type = usb_phy->charger_detect(usb_phy);
326 else
327 usb_phy->chg_type = UNKNOWN_TYPE;
328
329 schedule_work(&usb_phy->chg_work);
330}
331EXPORT_SYMBOL_GPL(usb_phy_set_charger_state);
332
333static void devm_usb_phy_release(struct device *dev, void *res)
334{
335 struct usb_phy *phy = *(struct usb_phy **)res;
336
337 usb_put_phy(phy);
338}
339
340static void devm_usb_phy_release2(struct device *dev, void *_res)
341{
342 struct phy_devm *res = _res;
343
344 if (res->nb)
345 usb_unregister_notifier(res->phy, res->nb);
346 usb_put_phy(res->phy);
347}
348
349static void usb_charger_init(struct usb_phy *usb_phy)
350{
351 usb_phy->chg_type = UNKNOWN_TYPE;
352 usb_phy->chg_state = USB_CHARGER_DEFAULT;
353 usb_phy_set_default_current(usb_phy);
354 INIT_WORK(&usb_phy->chg_work, usb_phy_notify_charger_work);
355}
356
357static int usb_add_extcon(struct usb_phy *x)
358{
359 int ret;
360
361 if (of_property_present(x->dev->of_node, "extcon")) {
362 x->edev = extcon_get_edev_by_phandle(x->dev, 0);
363 if (IS_ERR(x->edev))
364 return PTR_ERR(x->edev);
365
366 x->id_edev = extcon_get_edev_by_phandle(x->dev, 1);
367 if (IS_ERR(x->id_edev)) {
368 x->id_edev = NULL;
369 dev_info(x->dev, "No separate ID extcon device\n");
370 }
371
372 if (x->vbus_nb.notifier_call) {
373 ret = devm_extcon_register_notifier(x->dev, x->edev,
374 EXTCON_USB,
375 &x->vbus_nb);
376 if (ret < 0) {
377 dev_err(x->dev,
378 "register VBUS notifier failed\n");
379 return ret;
380 }
381 } else {
382 x->type_nb.notifier_call = usb_phy_get_charger_type;
383
384 ret = devm_extcon_register_notifier(x->dev, x->edev,
385 EXTCON_CHG_USB_SDP,
386 &x->type_nb);
387 if (ret) {
388 dev_err(x->dev,
389 "register extcon USB SDP failed.\n");
390 return ret;
391 }
392
393 ret = devm_extcon_register_notifier(x->dev, x->edev,
394 EXTCON_CHG_USB_CDP,
395 &x->type_nb);
396 if (ret) {
397 dev_err(x->dev,
398 "register extcon USB CDP failed.\n");
399 return ret;
400 }
401
402 ret = devm_extcon_register_notifier(x->dev, x->edev,
403 EXTCON_CHG_USB_DCP,
404 &x->type_nb);
405 if (ret) {
406 dev_err(x->dev,
407 "register extcon USB DCP failed.\n");
408 return ret;
409 }
410
411 ret = devm_extcon_register_notifier(x->dev, x->edev,
412 EXTCON_CHG_USB_ACA,
413 &x->type_nb);
414 if (ret) {
415 dev_err(x->dev,
416 "register extcon USB ACA failed.\n");
417 return ret;
418 }
419 }
420
421 if (x->id_nb.notifier_call) {
422 struct extcon_dev *id_ext;
423
424 if (x->id_edev)
425 id_ext = x->id_edev;
426 else
427 id_ext = x->edev;
428
429 ret = devm_extcon_register_notifier(x->dev, id_ext,
430 EXTCON_USB_HOST,
431 &x->id_nb);
432 if (ret < 0) {
433 dev_err(x->dev,
434 "register ID notifier failed\n");
435 return ret;
436 }
437 }
438 }
439
440 if (x->type_nb.notifier_call)
441 __usb_phy_get_charger_type(x);
442
443 return 0;
444}
445
446/**
447 * devm_usb_get_phy - find the USB PHY
448 * @dev: device that requests this phy
449 * @type: the type of the phy the controller requires
450 *
451 * Gets the phy using usb_get_phy(), and associates a device with it using
452 * devres. On driver detach, release function is invoked on the devres data,
453 * then, devres data is freed.
454 *
455 * For use by USB host and peripheral drivers.
456 */
457struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
458{
459 struct usb_phy **ptr, *phy;
460
461 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
462 if (!ptr)
463 return ERR_PTR(-ENOMEM);
464
465 phy = usb_get_phy(type);
466 if (!IS_ERR(phy)) {
467 *ptr = phy;
468 devres_add(dev, ptr);
469 } else
470 devres_free(ptr);
471
472 return phy;
473}
474EXPORT_SYMBOL_GPL(devm_usb_get_phy);
475
476/**
477 * usb_get_phy - find the USB PHY
478 * @type: the type of the phy the controller requires
479 *
480 * Returns the phy driver, after getting a refcount to it; or
481 * -ENODEV if there is no such phy. The caller is responsible for
482 * calling usb_put_phy() to release that count.
483 *
484 * For use by USB host and peripheral drivers.
485 */
486struct usb_phy *usb_get_phy(enum usb_phy_type type)
487{
488 struct usb_phy *phy = NULL;
489 unsigned long flags;
490
491 spin_lock_irqsave(&phy_lock, flags);
492
493 phy = __usb_find_phy(&phy_list, type);
494 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
495 pr_debug("PHY: unable to find transceiver of type %s\n",
496 usb_phy_type_string(type));
497 if (!IS_ERR(phy))
498 phy = ERR_PTR(-ENODEV);
499
500 goto err0;
501 }
502
503 get_device(phy->dev);
504
505err0:
506 spin_unlock_irqrestore(&phy_lock, flags);
507
508 return phy;
509}
510EXPORT_SYMBOL_GPL(usb_get_phy);
511
512/**
513 * devm_usb_get_phy_by_node - find the USB PHY by device_node
514 * @dev: device that requests this phy
515 * @node: the device_node for the phy device.
516 * @nb: a notifier_block to register with the phy.
517 *
518 * Returns the phy driver associated with the given device_node,
519 * after getting a refcount to it, -ENODEV if there is no such phy or
520 * -EPROBE_DEFER if the device is not yet loaded. While at that, it
521 * also associates the device with
522 * the phy using devres. On driver detach, release function is invoked
523 * on the devres data, then, devres data is freed.
524 *
525 * For use by peripheral drivers for devices related to a phy,
526 * such as a charger.
527 */
528struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
529 struct device_node *node,
530 struct notifier_block *nb)
531{
532 struct usb_phy *phy = ERR_PTR(-ENOMEM);
533 struct phy_devm *ptr;
534 unsigned long flags;
535
536 ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL);
537 if (!ptr) {
538 dev_dbg(dev, "failed to allocate memory for devres\n");
539 goto err0;
540 }
541
542 spin_lock_irqsave(&phy_lock, flags);
543
544 phy = __of_usb_find_phy(node);
545 if (IS_ERR(phy)) {
546 devres_free(ptr);
547 goto err1;
548 }
549
550 if (!try_module_get(phy->dev->driver->owner)) {
551 phy = ERR_PTR(-ENODEV);
552 devres_free(ptr);
553 goto err1;
554 }
555 if (nb)
556 usb_register_notifier(phy, nb);
557 ptr->phy = phy;
558 ptr->nb = nb;
559 devres_add(dev, ptr);
560
561 get_device(phy->dev);
562
563err1:
564 spin_unlock_irqrestore(&phy_lock, flags);
565
566err0:
567
568 return phy;
569}
570EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node);
571
572/**
573 * devm_usb_get_phy_by_phandle - find the USB PHY by phandle
574 * @dev: device that requests this phy
575 * @phandle: name of the property holding the phy phandle value
576 * @index: the index of the phy
577 *
578 * Returns the phy driver associated with the given phandle value,
579 * after getting a refcount to it, -ENODEV if there is no such phy or
580 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
581 * not yet loaded. While at that, it also associates the device with
582 * the phy using devres. On driver detach, release function is invoked
583 * on the devres data, then, devres data is freed.
584 *
585 * For use by USB host and peripheral drivers.
586 */
587struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
588 const char *phandle, u8 index)
589{
590 struct device_node *node;
591 struct usb_phy *phy;
592
593 if (!dev->of_node) {
594 dev_dbg(dev, "device does not have a device node entry\n");
595 return ERR_PTR(-EINVAL);
596 }
597
598 node = of_parse_phandle(dev->of_node, phandle, index);
599 if (!node) {
600 dev_dbg(dev, "failed to get %s phandle in %pOF node\n", phandle,
601 dev->of_node);
602 return ERR_PTR(-ENODEV);
603 }
604 phy = devm_usb_get_phy_by_node(dev, node, NULL);
605 of_node_put(node);
606 return phy;
607}
608EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
609
610/**
611 * usb_put_phy - release the USB PHY
612 * @x: the phy returned by usb_get_phy()
613 *
614 * Releases a refcount the caller received from usb_get_phy().
615 *
616 * For use by USB host and peripheral drivers.
617 */
618void usb_put_phy(struct usb_phy *x)
619{
620 if (x) {
621 struct module *owner = x->dev->driver->owner;
622
623 put_device(x->dev);
624 module_put(owner);
625 }
626}
627EXPORT_SYMBOL_GPL(usb_put_phy);
628
629/**
630 * usb_add_phy: declare the USB PHY
631 * @x: the USB phy to be used; or NULL
632 * @type: the type of this PHY
633 *
634 * This call is exclusively for use by phy drivers, which
635 * coordinate the activities of drivers for host and peripheral
636 * controllers, and in some cases for VBUS current regulation.
637 */
638int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
639{
640 int ret = 0;
641 unsigned long flags;
642 struct usb_phy *phy;
643
644 if (x->type != USB_PHY_TYPE_UNDEFINED) {
645 dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
646 return -EINVAL;
647 }
648
649 INIT_LIST_HEAD(&x->head);
650
651 usb_charger_init(x);
652 ret = usb_add_extcon(x);
653 if (ret)
654 return ret;
655
656 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
657
658 spin_lock_irqsave(&phy_lock, flags);
659
660 list_for_each_entry(phy, &phy_list, head) {
661 if (phy->type == type) {
662 ret = -EBUSY;
663 dev_err(x->dev, "transceiver type %s already exists\n",
664 usb_phy_type_string(type));
665 goto out;
666 }
667 }
668
669 x->type = type;
670 list_add_tail(&x->head, &phy_list);
671
672out:
673 spin_unlock_irqrestore(&phy_lock, flags);
674 return ret;
675}
676EXPORT_SYMBOL_GPL(usb_add_phy);
677
678static const struct device_type usb_phy_dev_type = {
679 .name = "usb_phy",
680 .uevent = usb_phy_uevent,
681};
682
683/**
684 * usb_add_phy_dev - declare the USB PHY
685 * @x: the USB phy to be used; or NULL
686 *
687 * This call is exclusively for use by phy drivers, which
688 * coordinate the activities of drivers for host and peripheral
689 * controllers, and in some cases for VBUS current regulation.
690 */
691int usb_add_phy_dev(struct usb_phy *x)
692{
693 unsigned long flags;
694 int ret;
695
696 if (!x->dev) {
697 dev_err(x->dev, "no device provided for PHY\n");
698 return -EINVAL;
699 }
700
701 INIT_LIST_HEAD(&x->head);
702
703 usb_charger_init(x);
704 ret = usb_add_extcon(x);
705 if (ret)
706 return ret;
707
708 x->dev->type = &usb_phy_dev_type;
709
710 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
711
712 spin_lock_irqsave(&phy_lock, flags);
713 list_add_tail(&x->head, &phy_list);
714 spin_unlock_irqrestore(&phy_lock, flags);
715
716 return 0;
717}
718EXPORT_SYMBOL_GPL(usb_add_phy_dev);
719
720/**
721 * usb_remove_phy - remove the OTG PHY
722 * @x: the USB OTG PHY to be removed;
723 *
724 * This reverts the effects of usb_add_phy
725 */
726void usb_remove_phy(struct usb_phy *x)
727{
728 unsigned long flags;
729
730 spin_lock_irqsave(&phy_lock, flags);
731 if (x)
732 list_del(&x->head);
733 spin_unlock_irqrestore(&phy_lock, flags);
734}
735EXPORT_SYMBOL_GPL(usb_remove_phy);
736
737/**
738 * usb_phy_set_event - set event to phy event
739 * @x: the phy returned by usb_get_phy();
740 * @event: event to set
741 *
742 * This sets event to phy event
743 */
744void usb_phy_set_event(struct usb_phy *x, unsigned long event)
745{
746 x->last_event = event;
747}
748EXPORT_SYMBOL_GPL(usb_phy_set_event);