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Merge tag 'zonefs-5.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal...
[linux.git] / drivers / usb / phy / phy.c
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
29 static LIST_HEAD(phy_list);
30 static DEFINE_SPINLOCK(phy_lock);
31
32 struct phy_devm {
33         struct usb_phy *phy;
34         struct notifier_block *nb;
35 };
36
37 static 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
45 static 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
51 static 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
66 static 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
83 static struct usb_phy *__device_to_usb_phy(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                         break;
90         }
91
92         return usb_phy;
93 }
94
95 static 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  */
123 static 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
148 static int usb_phy_uevent(struct device *dev, struct kobj_uevent_env *env)
149 {
150         struct usb_phy *usb_phy;
151         char uchger_state[50] = { 0 };
152         char uchger_type[50] = { 0 };
153
154         usb_phy = __device_to_usb_phy(dev);
155
156         snprintf(uchger_state, ARRAY_SIZE(uchger_state),
157                  "USB_CHARGER_STATE=%s", usb_chger_state[usb_phy->chg_state]);
158
159         snprintf(uchger_type, ARRAY_SIZE(uchger_type),
160                  "USB_CHARGER_TYPE=%s", usb_chger_type[usb_phy->chg_type]);
161
162         if (add_uevent_var(env, uchger_state))
163                 return -ENOMEM;
164
165         if (add_uevent_var(env, uchger_type))
166                 return -ENOMEM;
167
168         return 0;
169 }
170
171 static void __usb_phy_get_charger_type(struct usb_phy *usb_phy)
172 {
173         if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_SDP) > 0) {
174                 usb_phy->chg_type = SDP_TYPE;
175                 usb_phy->chg_state = USB_CHARGER_PRESENT;
176         } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_CDP) > 0) {
177                 usb_phy->chg_type = CDP_TYPE;
178                 usb_phy->chg_state = USB_CHARGER_PRESENT;
179         } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_DCP) > 0) {
180                 usb_phy->chg_type = DCP_TYPE;
181                 usb_phy->chg_state = USB_CHARGER_PRESENT;
182         } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_ACA) > 0) {
183                 usb_phy->chg_type = ACA_TYPE;
184                 usb_phy->chg_state = USB_CHARGER_PRESENT;
185         } else {
186                 usb_phy->chg_type = UNKNOWN_TYPE;
187                 usb_phy->chg_state = USB_CHARGER_ABSENT;
188         }
189
190         schedule_work(&usb_phy->chg_work);
191 }
192
193 /**
194  * usb_phy_get_charger_type - get charger type from extcon subsystem
195  * @nb: the notifier block to determine charger type
196  * @state: the cable state
197  * @data: private data
198  *
199  * Determin the charger type from extcon subsystem which also means the
200  * charger state has been chaned, then we should notify this event.
201  */
202 static int usb_phy_get_charger_type(struct notifier_block *nb,
203                                     unsigned long state, void *data)
204 {
205         struct usb_phy *usb_phy = container_of(nb, struct usb_phy, type_nb);
206
207         __usb_phy_get_charger_type(usb_phy);
208         return NOTIFY_OK;
209 }
210
211 /**
212  * usb_phy_set_charger_current - set the USB charger current
213  * @usb_phy: the USB phy to be used
214  * @mA: the current need to be set
215  *
216  * Usually we only change the charger default current when USB finished the
217  * enumeration as one SDP charger. As one SDP charger, usb_phy_set_power()
218  * will issue this function to change charger current when after setting USB
219  * configuration, or suspend/resume USB. For other type charger, we should
220  * use the default charger current and we do not suggest to issue this function
221  * to change the charger current.
222  *
223  * When USB charger current has been changed, we need to notify the power users.
224  */
225 void usb_phy_set_charger_current(struct usb_phy *usb_phy, unsigned int mA)
226 {
227         switch (usb_phy->chg_type) {
228         case SDP_TYPE:
229                 if (usb_phy->chg_cur.sdp_max == mA)
230                         return;
231
232                 usb_phy->chg_cur.sdp_max = (mA > DEFAULT_SDP_CUR_MAX_SS) ?
233                         DEFAULT_SDP_CUR_MAX_SS : mA;
234                 break;
235         case DCP_TYPE:
236                 if (usb_phy->chg_cur.dcp_max == mA)
237                         return;
238
239                 usb_phy->chg_cur.dcp_max = (mA > DEFAULT_DCP_CUR_MAX) ?
240                         DEFAULT_DCP_CUR_MAX : mA;
241                 break;
242         case CDP_TYPE:
243                 if (usb_phy->chg_cur.cdp_max == mA)
244                         return;
245
246                 usb_phy->chg_cur.cdp_max = (mA > DEFAULT_CDP_CUR_MAX) ?
247                         DEFAULT_CDP_CUR_MAX : mA;
248                 break;
249         case ACA_TYPE:
250                 if (usb_phy->chg_cur.aca_max == mA)
251                         return;
252
253                 usb_phy->chg_cur.aca_max = (mA > DEFAULT_ACA_CUR_MAX) ?
254                         DEFAULT_ACA_CUR_MAX : mA;
255                 break;
256         default:
257                 return;
258         }
259
260         schedule_work(&usb_phy->chg_work);
261 }
262 EXPORT_SYMBOL_GPL(usb_phy_set_charger_current);
263
264 /**
265  * usb_phy_get_charger_current - get the USB charger current
266  * @usb_phy: the USB phy to be used
267  * @min: the minimum current
268  * @max: the maximum current
269  *
270  * Usually we will notify the maximum current to power user, but for some
271  * special case, power user also need the minimum current value. Then the
272  * power user can issue this function to get the suitable current.
273  */
274 void usb_phy_get_charger_current(struct usb_phy *usb_phy,
275                                  unsigned int *min, unsigned int *max)
276 {
277         switch (usb_phy->chg_type) {
278         case SDP_TYPE:
279                 *min = usb_phy->chg_cur.sdp_min;
280                 *max = usb_phy->chg_cur.sdp_max;
281                 break;
282         case DCP_TYPE:
283                 *min = usb_phy->chg_cur.dcp_min;
284                 *max = usb_phy->chg_cur.dcp_max;
285                 break;
286         case CDP_TYPE:
287                 *min = usb_phy->chg_cur.cdp_min;
288                 *max = usb_phy->chg_cur.cdp_max;
289                 break;
290         case ACA_TYPE:
291                 *min = usb_phy->chg_cur.aca_min;
292                 *max = usb_phy->chg_cur.aca_max;
293                 break;
294         default:
295                 *min = 0;
296                 *max = 0;
297                 break;
298         }
299 }
300 EXPORT_SYMBOL_GPL(usb_phy_get_charger_current);
301
302 /**
303  * usb_phy_set_charger_state - set the USB charger state
304  * @usb_phy: the USB phy to be used
305  * @state: the new state need to be set for charger
306  *
307  * The usb phy driver can issue this function when the usb phy driver
308  * detected the charger state has been changed, in this case the charger
309  * type should be get from ->charger_detect().
310  */
311 void usb_phy_set_charger_state(struct usb_phy *usb_phy,
312                                enum usb_charger_state state)
313 {
314         if (usb_phy->chg_state == state || !usb_phy->charger_detect)
315                 return;
316
317         usb_phy->chg_state = state;
318         if (usb_phy->chg_state == USB_CHARGER_PRESENT)
319                 usb_phy->chg_type = usb_phy->charger_detect(usb_phy);
320         else
321                 usb_phy->chg_type = UNKNOWN_TYPE;
322
323         schedule_work(&usb_phy->chg_work);
324 }
325 EXPORT_SYMBOL_GPL(usb_phy_set_charger_state);
326
327 static void devm_usb_phy_release(struct device *dev, void *res)
328 {
329         struct usb_phy *phy = *(struct usb_phy **)res;
330
331         usb_put_phy(phy);
332 }
333
334 static void devm_usb_phy_release2(struct device *dev, void *_res)
335 {
336         struct phy_devm *res = _res;
337
338         if (res->nb)
339                 usb_unregister_notifier(res->phy, res->nb);
340         usb_put_phy(res->phy);
341 }
342
343 static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
344 {
345         struct usb_phy **phy = res;
346
347         return *phy == match_data;
348 }
349
350 static void usb_charger_init(struct usb_phy *usb_phy)
351 {
352         usb_phy->chg_type = UNKNOWN_TYPE;
353         usb_phy->chg_state = USB_CHARGER_DEFAULT;
354         usb_phy_set_default_current(usb_phy);
355         INIT_WORK(&usb_phy->chg_work, usb_phy_notify_charger_work);
356 }
357
358 static int usb_add_extcon(struct usb_phy *x)
359 {
360         int ret;
361
362         if (of_property_read_bool(x->dev->of_node, "extcon")) {
363                 x->edev = extcon_get_edev_by_phandle(x->dev, 0);
364                 if (IS_ERR(x->edev))
365                         return PTR_ERR(x->edev);
366
367                 x->id_edev = extcon_get_edev_by_phandle(x->dev, 1);
368                 if (IS_ERR(x->id_edev)) {
369                         x->id_edev = NULL;
370                         dev_info(x->dev, "No separate ID extcon device\n");
371                 }
372
373                 if (x->vbus_nb.notifier_call) {
374                         ret = devm_extcon_register_notifier(x->dev, x->edev,
375                                                             EXTCON_USB,
376                                                             &x->vbus_nb);
377                         if (ret < 0) {
378                                 dev_err(x->dev,
379                                         "register VBUS notifier failed\n");
380                                 return ret;
381                         }
382                 } else {
383                         x->type_nb.notifier_call = usb_phy_get_charger_type;
384
385                         ret = devm_extcon_register_notifier(x->dev, x->edev,
386                                                             EXTCON_CHG_USB_SDP,
387                                                             &x->type_nb);
388                         if (ret) {
389                                 dev_err(x->dev,
390                                         "register extcon USB SDP failed.\n");
391                                 return ret;
392                         }
393
394                         ret = devm_extcon_register_notifier(x->dev, x->edev,
395                                                             EXTCON_CHG_USB_CDP,
396                                                             &x->type_nb);
397                         if (ret) {
398                                 dev_err(x->dev,
399                                         "register extcon USB CDP failed.\n");
400                                 return ret;
401                         }
402
403                         ret = devm_extcon_register_notifier(x->dev, x->edev,
404                                                             EXTCON_CHG_USB_DCP,
405                                                             &x->type_nb);
406                         if (ret) {
407                                 dev_err(x->dev,
408                                         "register extcon USB DCP failed.\n");
409                                 return ret;
410                         }
411
412                         ret = devm_extcon_register_notifier(x->dev, x->edev,
413                                                             EXTCON_CHG_USB_ACA,
414                                                             &x->type_nb);
415                         if (ret) {
416                                 dev_err(x->dev,
417                                         "register extcon USB ACA failed.\n");
418                                 return ret;
419                         }
420                 }
421
422                 if (x->id_nb.notifier_call) {
423                         struct extcon_dev *id_ext;
424
425                         if (x->id_edev)
426                                 id_ext = x->id_edev;
427                         else
428                                 id_ext = x->edev;
429
430                         ret = devm_extcon_register_notifier(x->dev, id_ext,
431                                                             EXTCON_USB_HOST,
432                                                             &x->id_nb);
433                         if (ret < 0) {
434                                 dev_err(x->dev,
435                                         "register ID notifier failed\n");
436                                 return ret;
437                         }
438                 }
439         }
440
441         if (x->type_nb.notifier_call)
442                 __usb_phy_get_charger_type(x);
443
444         return 0;
445 }
446
447 /**
448  * devm_usb_get_phy - find the USB PHY
449  * @dev: device that requests this phy
450  * @type: the type of the phy the controller requires
451  *
452  * Gets the phy using usb_get_phy(), and associates a device with it using
453  * devres. On driver detach, release function is invoked on the devres data,
454  * then, devres data is freed.
455  *
456  * For use by USB host and peripheral drivers.
457  */
458 struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
459 {
460         struct usb_phy **ptr, *phy;
461
462         ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
463         if (!ptr)
464                 return ERR_PTR(-ENOMEM);
465
466         phy = usb_get_phy(type);
467         if (!IS_ERR(phy)) {
468                 *ptr = phy;
469                 devres_add(dev, ptr);
470         } else
471                 devres_free(ptr);
472
473         return phy;
474 }
475 EXPORT_SYMBOL_GPL(devm_usb_get_phy);
476
477 /**
478  * usb_get_phy - find the USB PHY
479  * @type: the type of the phy the controller requires
480  *
481  * Returns the phy driver, after getting a refcount to it; or
482  * -ENODEV if there is no such phy.  The caller is responsible for
483  * calling usb_put_phy() to release that count.
484  *
485  * For use by USB host and peripheral drivers.
486  */
487 struct usb_phy *usb_get_phy(enum usb_phy_type type)
488 {
489         struct usb_phy  *phy = NULL;
490         unsigned long   flags;
491
492         spin_lock_irqsave(&phy_lock, flags);
493
494         phy = __usb_find_phy(&phy_list, type);
495         if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
496                 pr_debug("PHY: unable to find transceiver of type %s\n",
497                         usb_phy_type_string(type));
498                 if (!IS_ERR(phy))
499                         phy = ERR_PTR(-ENODEV);
500
501                 goto err0;
502         }
503
504         get_device(phy->dev);
505
506 err0:
507         spin_unlock_irqrestore(&phy_lock, flags);
508
509         return phy;
510 }
511 EXPORT_SYMBOL_GPL(usb_get_phy);
512
513 /**
514  * devm_usb_get_phy_by_node - find the USB PHY by device_node
515  * @dev: device that requests this phy
516  * @node: the device_node for the phy device.
517  * @nb: a notifier_block to register with the phy.
518  *
519  * Returns the phy driver associated with the given device_node,
520  * after getting a refcount to it, -ENODEV if there is no such phy or
521  * -EPROBE_DEFER if the device is not yet loaded. While at that, it
522  * also associates the device with
523  * the phy using devres. On driver detach, release function is invoked
524  * on the devres data, then, devres data is freed.
525  *
526  * For use by peripheral drivers for devices related to a phy,
527  * such as a charger.
528  */
529 struct  usb_phy *devm_usb_get_phy_by_node(struct device *dev,
530                                           struct device_node *node,
531                                           struct notifier_block *nb)
532 {
533         struct usb_phy  *phy = ERR_PTR(-ENOMEM);
534         struct phy_devm *ptr;
535         unsigned long   flags;
536
537         ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL);
538         if (!ptr) {
539                 dev_dbg(dev, "failed to allocate memory for devres\n");
540                 goto err0;
541         }
542
543         spin_lock_irqsave(&phy_lock, flags);
544
545         phy = __of_usb_find_phy(node);
546         if (IS_ERR(phy)) {
547                 devres_free(ptr);
548                 goto err1;
549         }
550
551         if (!try_module_get(phy->dev->driver->owner)) {
552                 phy = ERR_PTR(-ENODEV);
553                 devres_free(ptr);
554                 goto err1;
555         }
556         if (nb)
557                 usb_register_notifier(phy, nb);
558         ptr->phy = phy;
559         ptr->nb = nb;
560         devres_add(dev, ptr);
561
562         get_device(phy->dev);
563
564 err1:
565         spin_unlock_irqrestore(&phy_lock, flags);
566
567 err0:
568
569         return phy;
570 }
571 EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node);
572
573 /**
574  * devm_usb_get_phy_by_phandle - find the USB PHY by phandle
575  * @dev: device that requests this phy
576  * @phandle: name of the property holding the phy phandle value
577  * @index: the index of the phy
578  *
579  * Returns the phy driver associated with the given phandle value,
580  * after getting a refcount to it, -ENODEV if there is no such phy or
581  * -EPROBE_DEFER if there is a phandle to the phy, but the device is
582  * not yet loaded. While at that, it also associates the device with
583  * the phy using devres. On driver detach, release function is invoked
584  * on the devres data, then, devres data is freed.
585  *
586  * For use by USB host and peripheral drivers.
587  */
588 struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
589         const char *phandle, u8 index)
590 {
591         struct device_node *node;
592         struct usb_phy  *phy;
593
594         if (!dev->of_node) {
595                 dev_dbg(dev, "device does not have a device node entry\n");
596                 return ERR_PTR(-EINVAL);
597         }
598
599         node = of_parse_phandle(dev->of_node, phandle, index);
600         if (!node) {
601                 dev_dbg(dev, "failed to get %s phandle in %pOF node\n", phandle,
602                         dev->of_node);
603                 return ERR_PTR(-ENODEV);
604         }
605         phy = devm_usb_get_phy_by_node(dev, node, NULL);
606         of_node_put(node);
607         return phy;
608 }
609 EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
610
611 /**
612  * devm_usb_put_phy - release the USB PHY
613  * @dev: device that wants to release this phy
614  * @phy: the phy returned by devm_usb_get_phy()
615  *
616  * destroys the devres associated with this phy and invokes usb_put_phy
617  * to release the phy.
618  *
619  * For use by USB host and peripheral drivers.
620  */
621 void devm_usb_put_phy(struct device *dev, struct usb_phy *phy)
622 {
623         int r;
624
625         r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
626         dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
627 }
628 EXPORT_SYMBOL_GPL(devm_usb_put_phy);
629
630 /**
631  * usb_put_phy - release the USB PHY
632  * @x: the phy returned by usb_get_phy()
633  *
634  * Releases a refcount the caller received from usb_get_phy().
635  *
636  * For use by USB host and peripheral drivers.
637  */
638 void usb_put_phy(struct usb_phy *x)
639 {
640         if (x) {
641                 struct module *owner = x->dev->driver->owner;
642
643                 put_device(x->dev);
644                 module_put(owner);
645         }
646 }
647 EXPORT_SYMBOL_GPL(usb_put_phy);
648
649 /**
650  * usb_add_phy: declare the USB PHY
651  * @x: the USB phy to be used; or NULL
652  * @type: the type of this PHY
653  *
654  * This call is exclusively for use by phy drivers, which
655  * coordinate the activities of drivers for host and peripheral
656  * controllers, and in some cases for VBUS current regulation.
657  */
658 int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
659 {
660         int             ret = 0;
661         unsigned long   flags;
662         struct usb_phy  *phy;
663
664         if (x->type != USB_PHY_TYPE_UNDEFINED) {
665                 dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
666                 return -EINVAL;
667         }
668
669         usb_charger_init(x);
670         ret = usb_add_extcon(x);
671         if (ret)
672                 return ret;
673
674         ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
675
676         spin_lock_irqsave(&phy_lock, flags);
677
678         list_for_each_entry(phy, &phy_list, head) {
679                 if (phy->type == type) {
680                         ret = -EBUSY;
681                         dev_err(x->dev, "transceiver type %s already exists\n",
682                                                 usb_phy_type_string(type));
683                         goto out;
684                 }
685         }
686
687         x->type = type;
688         list_add_tail(&x->head, &phy_list);
689
690 out:
691         spin_unlock_irqrestore(&phy_lock, flags);
692         return ret;
693 }
694 EXPORT_SYMBOL_GPL(usb_add_phy);
695
696 static struct device_type usb_phy_dev_type = {
697         .name = "usb_phy",
698         .uevent = usb_phy_uevent,
699 };
700
701 /**
702  * usb_add_phy_dev - declare the USB PHY
703  * @x: the USB phy to be used; or NULL
704  *
705  * This call is exclusively for use by phy drivers, which
706  * coordinate the activities of drivers for host and peripheral
707  * controllers, and in some cases for VBUS current regulation.
708  */
709 int usb_add_phy_dev(struct usb_phy *x)
710 {
711         unsigned long flags;
712         int ret;
713
714         if (!x->dev) {
715                 dev_err(x->dev, "no device provided for PHY\n");
716                 return -EINVAL;
717         }
718
719         usb_charger_init(x);
720         ret = usb_add_extcon(x);
721         if (ret)
722                 return ret;
723
724         x->dev->type = &usb_phy_dev_type;
725
726         ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
727
728         spin_lock_irqsave(&phy_lock, flags);
729         list_add_tail(&x->head, &phy_list);
730         spin_unlock_irqrestore(&phy_lock, flags);
731
732         return 0;
733 }
734 EXPORT_SYMBOL_GPL(usb_add_phy_dev);
735
736 /**
737  * usb_remove_phy - remove the OTG PHY
738  * @x: the USB OTG PHY to be removed;
739  *
740  * This reverts the effects of usb_add_phy
741  */
742 void usb_remove_phy(struct usb_phy *x)
743 {
744         unsigned long   flags;
745
746         spin_lock_irqsave(&phy_lock, flags);
747         if (x)
748                 list_del(&x->head);
749         spin_unlock_irqrestore(&phy_lock, flags);
750 }
751 EXPORT_SYMBOL_GPL(usb_remove_phy);
752
753 /**
754  * usb_phy_set_event - set event to phy event
755  * @x: the phy returned by usb_get_phy();
756  * @event: event to set
757  *
758  * This sets event to phy event
759  */
760 void usb_phy_set_event(struct usb_phy *x, unsigned long event)
761 {
762         x->last_event = event;
763 }
764 EXPORT_SYMBOL_GPL(usb_phy_set_event);
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