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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 int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
350{
351 struct usb_phy **phy = res;
352
353 return *phy == match_data;
354}
355
356static void usb_charger_init(struct usb_phy *usb_phy)
357{
358 usb_phy->chg_type = UNKNOWN_TYPE;
359 usb_phy->chg_state = USB_CHARGER_DEFAULT;
360 usb_phy_set_default_current(usb_phy);
361 INIT_WORK(&usb_phy->chg_work, usb_phy_notify_charger_work);
362}
363
364static int usb_add_extcon(struct usb_phy *x)
365{
366 int ret;
367
368 if (of_property_read_bool(x->dev->of_node, "extcon")) {
369 x->edev = extcon_get_edev_by_phandle(x->dev, 0);
370 if (IS_ERR(x->edev))
371 return PTR_ERR(x->edev);
372
373 x->id_edev = extcon_get_edev_by_phandle(x->dev, 1);
374 if (IS_ERR(x->id_edev)) {
375 x->id_edev = NULL;
376 dev_info(x->dev, "No separate ID extcon device\n");
377 }
378
379 if (x->vbus_nb.notifier_call) {
380 ret = devm_extcon_register_notifier(x->dev, x->edev,
381 EXTCON_USB,
382 &x->vbus_nb);
383 if (ret < 0) {
384 dev_err(x->dev,
385 "register VBUS notifier failed\n");
386 return ret;
387 }
388 } else {
389 x->type_nb.notifier_call = usb_phy_get_charger_type;
390
391 ret = devm_extcon_register_notifier(x->dev, x->edev,
392 EXTCON_CHG_USB_SDP,
393 &x->type_nb);
394 if (ret) {
395 dev_err(x->dev,
396 "register extcon USB SDP failed.\n");
397 return ret;
398 }
399
400 ret = devm_extcon_register_notifier(x->dev, x->edev,
401 EXTCON_CHG_USB_CDP,
402 &x->type_nb);
403 if (ret) {
404 dev_err(x->dev,
405 "register extcon USB CDP failed.\n");
406 return ret;
407 }
408
409 ret = devm_extcon_register_notifier(x->dev, x->edev,
410 EXTCON_CHG_USB_DCP,
411 &x->type_nb);
412 if (ret) {
413 dev_err(x->dev,
414 "register extcon USB DCP failed.\n");
415 return ret;
416 }
417
418 ret = devm_extcon_register_notifier(x->dev, x->edev,
419 EXTCON_CHG_USB_ACA,
420 &x->type_nb);
421 if (ret) {
422 dev_err(x->dev,
423 "register extcon USB ACA failed.\n");
424 return ret;
425 }
426 }
427
428 if (x->id_nb.notifier_call) {
429 struct extcon_dev *id_ext;
430
431 if (x->id_edev)
432 id_ext = x->id_edev;
433 else
434 id_ext = x->edev;
435
436 ret = devm_extcon_register_notifier(x->dev, id_ext,
437 EXTCON_USB_HOST,
438 &x->id_nb);
439 if (ret < 0) {
440 dev_err(x->dev,
441 "register ID notifier failed\n");
442 return ret;
443 }
444 }
445 }
446
447 if (x->type_nb.notifier_call)
448 __usb_phy_get_charger_type(x);
449
450 return 0;
451}
452
453/**
454 * devm_usb_get_phy - find the USB PHY
455 * @dev: device that requests this phy
456 * @type: the type of the phy the controller requires
457 *
458 * Gets the phy using usb_get_phy(), and associates a device with it using
459 * devres. On driver detach, release function is invoked on the devres data,
460 * then, devres data is freed.
461 *
462 * For use by USB host and peripheral drivers.
463 */
464struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
465{
466 struct usb_phy **ptr, *phy;
467
468 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
469 if (!ptr)
470 return ERR_PTR(-ENOMEM);
471
472 phy = usb_get_phy(type);
473 if (!IS_ERR(phy)) {
474 *ptr = phy;
475 devres_add(dev, ptr);
476 } else
477 devres_free(ptr);
478
479 return phy;
480}
481EXPORT_SYMBOL_GPL(devm_usb_get_phy);
482
483/**
484 * usb_get_phy - find the USB PHY
485 * @type: the type of the phy the controller requires
486 *
487 * Returns the phy driver, after getting a refcount to it; or
488 * -ENODEV if there is no such phy. The caller is responsible for
489 * calling usb_put_phy() to release that count.
490 *
491 * For use by USB host and peripheral drivers.
492 */
493struct usb_phy *usb_get_phy(enum usb_phy_type type)
494{
495 struct usb_phy *phy = NULL;
496 unsigned long flags;
497
498 spin_lock_irqsave(&phy_lock, flags);
499
500 phy = __usb_find_phy(&phy_list, type);
501 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
502 pr_debug("PHY: unable to find transceiver of type %s\n",
503 usb_phy_type_string(type));
504 if (!IS_ERR(phy))
505 phy = ERR_PTR(-ENODEV);
506
507 goto err0;
508 }
509
510 get_device(phy->dev);
511
512err0:
513 spin_unlock_irqrestore(&phy_lock, flags);
514
515 return phy;
516}
517EXPORT_SYMBOL_GPL(usb_get_phy);
518
519/**
520 * devm_usb_get_phy_by_node - find the USB PHY by device_node
521 * @dev: device that requests this phy
522 * @node: the device_node for the phy device.
523 * @nb: a notifier_block to register with the phy.
524 *
525 * Returns the phy driver associated with the given device_node,
526 * after getting a refcount to it, -ENODEV if there is no such phy or
527 * -EPROBE_DEFER if the device is not yet loaded. While at that, it
528 * also associates the device with
529 * the phy using devres. On driver detach, release function is invoked
530 * on the devres data, then, devres data is freed.
531 *
532 * For use by peripheral drivers for devices related to a phy,
533 * such as a charger.
534 */
535struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
536 struct device_node *node,
537 struct notifier_block *nb)
538{
539 struct usb_phy *phy = ERR_PTR(-ENOMEM);
540 struct phy_devm *ptr;
541 unsigned long flags;
542
543 ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL);
544 if (!ptr) {
545 dev_dbg(dev, "failed to allocate memory for devres\n");
546 goto err0;
547 }
548
549 spin_lock_irqsave(&phy_lock, flags);
550
551 phy = __of_usb_find_phy(node);
552 if (IS_ERR(phy)) {
553 devres_free(ptr);
554 goto err1;
555 }
556
557 if (!try_module_get(phy->dev->driver->owner)) {
558 phy = ERR_PTR(-ENODEV);
559 devres_free(ptr);
560 goto err1;
561 }
562 if (nb)
563 usb_register_notifier(phy, nb);
564 ptr->phy = phy;
565 ptr->nb = nb;
566 devres_add(dev, ptr);
567
568 get_device(phy->dev);
569
570err1:
571 spin_unlock_irqrestore(&phy_lock, flags);
572
573err0:
574
575 return phy;
576}
577EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node);
578
579/**
580 * devm_usb_get_phy_by_phandle - find the USB PHY by phandle
581 * @dev: device that requests this phy
582 * @phandle: name of the property holding the phy phandle value
583 * @index: the index of the phy
584 *
585 * Returns the phy driver associated with the given phandle value,
586 * after getting a refcount to it, -ENODEV if there is no such phy or
587 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
588 * not yet loaded. While at that, it also associates the device with
589 * the phy using devres. On driver detach, release function is invoked
590 * on the devres data, then, devres data is freed.
591 *
592 * For use by USB host and peripheral drivers.
593 */
594struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
595 const char *phandle, u8 index)
596{
597 struct device_node *node;
598 struct usb_phy *phy;
599
600 if (!dev->of_node) {
601 dev_dbg(dev, "device does not have a device node entry\n");
602 return ERR_PTR(-EINVAL);
603 }
604
605 node = of_parse_phandle(dev->of_node, phandle, index);
606 if (!node) {
607 dev_dbg(dev, "failed to get %s phandle in %pOF node\n", phandle,
608 dev->of_node);
609 return ERR_PTR(-ENODEV);
610 }
611 phy = devm_usb_get_phy_by_node(dev, node, NULL);
612 of_node_put(node);
613 return phy;
614}
615EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
616
617/**
618 * devm_usb_put_phy - release the USB PHY
619 * @dev: device that wants to release this phy
620 * @phy: the phy returned by devm_usb_get_phy()
621 *
622 * destroys the devres associated with this phy and invokes usb_put_phy
623 * to release the phy.
624 *
625 * For use by USB host and peripheral drivers.
626 */
627void devm_usb_put_phy(struct device *dev, struct usb_phy *phy)
628{
629 int r;
630
631 r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
632 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
633}
634EXPORT_SYMBOL_GPL(devm_usb_put_phy);
635
636/**
637 * usb_put_phy - release the USB PHY
638 * @x: the phy returned by usb_get_phy()
639 *
640 * Releases a refcount the caller received from usb_get_phy().
641 *
642 * For use by USB host and peripheral drivers.
643 */
644void usb_put_phy(struct usb_phy *x)
645{
646 if (x) {
647 struct module *owner = x->dev->driver->owner;
648
649 put_device(x->dev);
650 module_put(owner);
651 }
652}
653EXPORT_SYMBOL_GPL(usb_put_phy);
654
655/**
656 * usb_add_phy: declare the USB PHY
657 * @x: the USB phy to be used; or NULL
658 * @type: the type of this PHY
659 *
660 * This call is exclusively for use by phy drivers, which
661 * coordinate the activities of drivers for host and peripheral
662 * controllers, and in some cases for VBUS current regulation.
663 */
664int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
665{
666 int ret = 0;
667 unsigned long flags;
668 struct usb_phy *phy;
669
670 if (x->type != USB_PHY_TYPE_UNDEFINED) {
671 dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
672 return -EINVAL;
673 }
674
675 usb_charger_init(x);
676 ret = usb_add_extcon(x);
677 if (ret)
678 return ret;
679
680 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
681
682 spin_lock_irqsave(&phy_lock, flags);
683
684 list_for_each_entry(phy, &phy_list, head) {
685 if (phy->type == type) {
686 ret = -EBUSY;
687 dev_err(x->dev, "transceiver type %s already exists\n",
688 usb_phy_type_string(type));
689 goto out;
690 }
691 }
692
693 x->type = type;
694 list_add_tail(&x->head, &phy_list);
695
696out:
697 spin_unlock_irqrestore(&phy_lock, flags);
698 return ret;
699}
700EXPORT_SYMBOL_GPL(usb_add_phy);
701
702static struct device_type usb_phy_dev_type = {
703 .name = "usb_phy",
704 .uevent = usb_phy_uevent,
705};
706
707/**
708 * usb_add_phy_dev - declare the USB PHY
709 * @x: the USB phy to be used; or NULL
710 *
711 * This call is exclusively for use by phy drivers, which
712 * coordinate the activities of drivers for host and peripheral
713 * controllers, and in some cases for VBUS current regulation.
714 */
715int usb_add_phy_dev(struct usb_phy *x)
716{
717 unsigned long flags;
718 int ret;
719
720 if (!x->dev) {
721 dev_err(x->dev, "no device provided for PHY\n");
722 return -EINVAL;
723 }
724
725 usb_charger_init(x);
726 ret = usb_add_extcon(x);
727 if (ret)
728 return ret;
729
730 x->dev->type = &usb_phy_dev_type;
731
732 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
733
734 spin_lock_irqsave(&phy_lock, flags);
735 list_add_tail(&x->head, &phy_list);
736 spin_unlock_irqrestore(&phy_lock, flags);
737
738 return 0;
739}
740EXPORT_SYMBOL_GPL(usb_add_phy_dev);
741
742/**
743 * usb_remove_phy - remove the OTG PHY
744 * @x: the USB OTG PHY to be removed;
745 *
746 * This reverts the effects of usb_add_phy
747 */
748void usb_remove_phy(struct usb_phy *x)
749{
750 unsigned long flags;
751
752 spin_lock_irqsave(&phy_lock, flags);
753 if (x)
754 list_del(&x->head);
755 spin_unlock_irqrestore(&phy_lock, flags);
756}
757EXPORT_SYMBOL_GPL(usb_remove_phy);
758
759/**
760 * usb_phy_set_event - set event to phy event
761 * @x: the phy returned by usb_get_phy();
762 * @event: event to set
763 *
764 * This sets event to phy event
765 */
766void usb_phy_set_event(struct usb_phy *x, unsigned long event)
767{
768 x->last_event = event;
769}
770EXPORT_SYMBOL_GPL(usb_phy_set_event);
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 struct usb_phy *__usb_find_phy(struct list_head *list,
38 enum usb_phy_type type)
39{
40 struct usb_phy *phy = NULL;
41
42 list_for_each_entry(phy, list, head) {
43 if (phy->type != type)
44 continue;
45
46 return phy;
47 }
48
49 return ERR_PTR(-ENODEV);
50}
51
52static struct usb_phy *__of_usb_find_phy(struct device_node *node)
53{
54 struct usb_phy *phy;
55
56 if (!of_device_is_available(node))
57 return ERR_PTR(-ENODEV);
58
59 list_for_each_entry(phy, &phy_list, head) {
60 if (node != phy->dev->of_node)
61 continue;
62
63 return phy;
64 }
65
66 return ERR_PTR(-EPROBE_DEFER);
67}
68
69static void usb_phy_set_default_current(struct usb_phy *usb_phy)
70{
71 usb_phy->chg_cur.sdp_min = DEFAULT_SDP_CUR_MIN;
72 usb_phy->chg_cur.sdp_max = DEFAULT_SDP_CUR_MAX;
73 usb_phy->chg_cur.dcp_min = DEFAULT_DCP_CUR_MIN;
74 usb_phy->chg_cur.dcp_max = DEFAULT_DCP_CUR_MAX;
75 usb_phy->chg_cur.cdp_min = DEFAULT_CDP_CUR_MIN;
76 usb_phy->chg_cur.cdp_max = DEFAULT_CDP_CUR_MAX;
77 usb_phy->chg_cur.aca_min = DEFAULT_ACA_CUR_MIN;
78 usb_phy->chg_cur.aca_max = DEFAULT_ACA_CUR_MAX;
79}
80
81/**
82 * usb_phy_notify_charger_work - notify the USB charger state
83 * @work - the charger work to notify the USB charger state
84 *
85 * This work can be issued when USB charger state has been changed or
86 * USB charger current has been changed, then we can notify the current
87 * what can be drawn to power user and the charger state to userspace.
88 *
89 * If we get the charger type from extcon subsystem, we can notify the
90 * charger state to power user automatically by usb_phy_get_charger_type()
91 * issuing from extcon subsystem.
92 *
93 * If we get the charger type from ->charger_detect() instead of extcon
94 * subsystem, the usb phy driver should issue usb_phy_set_charger_state()
95 * to set charger state when the charger state has been changed.
96 */
97static void usb_phy_notify_charger_work(struct work_struct *work)
98{
99 struct usb_phy *usb_phy = container_of(work, struct usb_phy, chg_work);
100 char uchger_state[50] = { 0 };
101 char *envp[] = { uchger_state, NULL };
102 unsigned int min, max;
103
104 switch (usb_phy->chg_state) {
105 case USB_CHARGER_PRESENT:
106 usb_phy_get_charger_current(usb_phy, &min, &max);
107
108 atomic_notifier_call_chain(&usb_phy->notifier, max, usb_phy);
109 snprintf(uchger_state, ARRAY_SIZE(uchger_state),
110 "USB_CHARGER_STATE=%s", "USB_CHARGER_PRESENT");
111 break;
112 case USB_CHARGER_ABSENT:
113 usb_phy_set_default_current(usb_phy);
114
115 atomic_notifier_call_chain(&usb_phy->notifier, 0, usb_phy);
116 snprintf(uchger_state, ARRAY_SIZE(uchger_state),
117 "USB_CHARGER_STATE=%s", "USB_CHARGER_ABSENT");
118 break;
119 default:
120 dev_warn(usb_phy->dev, "Unknown USB charger state: %d\n",
121 usb_phy->chg_state);
122 return;
123 }
124
125 kobject_uevent_env(&usb_phy->dev->kobj, KOBJ_CHANGE, envp);
126}
127
128static void __usb_phy_get_charger_type(struct usb_phy *usb_phy)
129{
130 if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_SDP) > 0) {
131 usb_phy->chg_type = SDP_TYPE;
132 usb_phy->chg_state = USB_CHARGER_PRESENT;
133 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_CDP) > 0) {
134 usb_phy->chg_type = CDP_TYPE;
135 usb_phy->chg_state = USB_CHARGER_PRESENT;
136 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_DCP) > 0) {
137 usb_phy->chg_type = DCP_TYPE;
138 usb_phy->chg_state = USB_CHARGER_PRESENT;
139 } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_ACA) > 0) {
140 usb_phy->chg_type = ACA_TYPE;
141 usb_phy->chg_state = USB_CHARGER_PRESENT;
142 } else {
143 usb_phy->chg_type = UNKNOWN_TYPE;
144 usb_phy->chg_state = USB_CHARGER_ABSENT;
145 }
146
147 schedule_work(&usb_phy->chg_work);
148}
149
150/**
151 * usb_phy_get_charger_type - get charger type from extcon subsystem
152 * @nb -the notifier block to determine charger type
153 * @state - the cable state
154 * @data - private data
155 *
156 * Determin the charger type from extcon subsystem which also means the
157 * charger state has been chaned, then we should notify this event.
158 */
159static int usb_phy_get_charger_type(struct notifier_block *nb,
160 unsigned long state, void *data)
161{
162 struct usb_phy *usb_phy = container_of(nb, struct usb_phy, type_nb);
163
164 __usb_phy_get_charger_type(usb_phy);
165 return NOTIFY_OK;
166}
167
168/**
169 * usb_phy_set_charger_current - set the USB charger current
170 * @usb_phy - the USB phy to be used
171 * @mA - the current need to be set
172 *
173 * Usually we only change the charger default current when USB finished the
174 * enumeration as one SDP charger. As one SDP charger, usb_phy_set_power()
175 * will issue this function to change charger current when after setting USB
176 * configuration, or suspend/resume USB. For other type charger, we should
177 * use the default charger current and we do not suggest to issue this function
178 * to change the charger current.
179 *
180 * When USB charger current has been changed, we need to notify the power users.
181 */
182void usb_phy_set_charger_current(struct usb_phy *usb_phy, unsigned int mA)
183{
184 switch (usb_phy->chg_type) {
185 case SDP_TYPE:
186 if (usb_phy->chg_cur.sdp_max == mA)
187 return;
188
189 usb_phy->chg_cur.sdp_max = (mA > DEFAULT_SDP_CUR_MAX_SS) ?
190 DEFAULT_SDP_CUR_MAX_SS : mA;
191 break;
192 case DCP_TYPE:
193 if (usb_phy->chg_cur.dcp_max == mA)
194 return;
195
196 usb_phy->chg_cur.dcp_max = (mA > DEFAULT_DCP_CUR_MAX) ?
197 DEFAULT_DCP_CUR_MAX : mA;
198 break;
199 case CDP_TYPE:
200 if (usb_phy->chg_cur.cdp_max == mA)
201 return;
202
203 usb_phy->chg_cur.cdp_max = (mA > DEFAULT_CDP_CUR_MAX) ?
204 DEFAULT_CDP_CUR_MAX : mA;
205 break;
206 case ACA_TYPE:
207 if (usb_phy->chg_cur.aca_max == mA)
208 return;
209
210 usb_phy->chg_cur.aca_max = (mA > DEFAULT_ACA_CUR_MAX) ?
211 DEFAULT_ACA_CUR_MAX : mA;
212 break;
213 default:
214 return;
215 }
216
217 schedule_work(&usb_phy->chg_work);
218}
219EXPORT_SYMBOL_GPL(usb_phy_set_charger_current);
220
221/**
222 * usb_phy_get_charger_current - get the USB charger current
223 * @usb_phy - the USB phy to be used
224 * @min - the minimum current
225 * @max - the maximum current
226 *
227 * Usually we will notify the maximum current to power user, but for some
228 * special case, power user also need the minimum current value. Then the
229 * power user can issue this function to get the suitable current.
230 */
231void usb_phy_get_charger_current(struct usb_phy *usb_phy,
232 unsigned int *min, unsigned int *max)
233{
234 switch (usb_phy->chg_type) {
235 case SDP_TYPE:
236 *min = usb_phy->chg_cur.sdp_min;
237 *max = usb_phy->chg_cur.sdp_max;
238 break;
239 case DCP_TYPE:
240 *min = usb_phy->chg_cur.dcp_min;
241 *max = usb_phy->chg_cur.dcp_max;
242 break;
243 case CDP_TYPE:
244 *min = usb_phy->chg_cur.cdp_min;
245 *max = usb_phy->chg_cur.cdp_max;
246 break;
247 case ACA_TYPE:
248 *min = usb_phy->chg_cur.aca_min;
249 *max = usb_phy->chg_cur.aca_max;
250 break;
251 default:
252 *min = 0;
253 *max = 0;
254 break;
255 }
256}
257EXPORT_SYMBOL_GPL(usb_phy_get_charger_current);
258
259/**
260 * usb_phy_set_charger_state - set the USB charger state
261 * @usb_phy - the USB phy to be used
262 * @state - the new state need to be set for charger
263 *
264 * The usb phy driver can issue this function when the usb phy driver
265 * detected the charger state has been changed, in this case the charger
266 * type should be get from ->charger_detect().
267 */
268void usb_phy_set_charger_state(struct usb_phy *usb_phy,
269 enum usb_charger_state state)
270{
271 if (usb_phy->chg_state == state || !usb_phy->charger_detect)
272 return;
273
274 usb_phy->chg_state = state;
275 if (usb_phy->chg_state == USB_CHARGER_PRESENT)
276 usb_phy->chg_type = usb_phy->charger_detect(usb_phy);
277 else
278 usb_phy->chg_type = UNKNOWN_TYPE;
279
280 schedule_work(&usb_phy->chg_work);
281}
282EXPORT_SYMBOL_GPL(usb_phy_set_charger_state);
283
284static void devm_usb_phy_release(struct device *dev, void *res)
285{
286 struct usb_phy *phy = *(struct usb_phy **)res;
287
288 usb_put_phy(phy);
289}
290
291static void devm_usb_phy_release2(struct device *dev, void *_res)
292{
293 struct phy_devm *res = _res;
294
295 if (res->nb)
296 usb_unregister_notifier(res->phy, res->nb);
297 usb_put_phy(res->phy);
298}
299
300static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
301{
302 struct usb_phy **phy = res;
303
304 return *phy == match_data;
305}
306
307static void usb_charger_init(struct usb_phy *usb_phy)
308{
309 usb_phy->chg_type = UNKNOWN_TYPE;
310 usb_phy->chg_state = USB_CHARGER_DEFAULT;
311 usb_phy_set_default_current(usb_phy);
312 INIT_WORK(&usb_phy->chg_work, usb_phy_notify_charger_work);
313}
314
315static int usb_add_extcon(struct usb_phy *x)
316{
317 int ret;
318
319 if (of_property_read_bool(x->dev->of_node, "extcon")) {
320 x->edev = extcon_get_edev_by_phandle(x->dev, 0);
321 if (IS_ERR(x->edev))
322 return PTR_ERR(x->edev);
323
324 x->id_edev = extcon_get_edev_by_phandle(x->dev, 1);
325 if (IS_ERR(x->id_edev)) {
326 x->id_edev = NULL;
327 dev_info(x->dev, "No separate ID extcon device\n");
328 }
329
330 if (x->vbus_nb.notifier_call) {
331 ret = devm_extcon_register_notifier(x->dev, x->edev,
332 EXTCON_USB,
333 &x->vbus_nb);
334 if (ret < 0) {
335 dev_err(x->dev,
336 "register VBUS notifier failed\n");
337 return ret;
338 }
339 } else {
340 x->type_nb.notifier_call = usb_phy_get_charger_type;
341
342 ret = devm_extcon_register_notifier(x->dev, x->edev,
343 EXTCON_CHG_USB_SDP,
344 &x->type_nb);
345 if (ret) {
346 dev_err(x->dev,
347 "register extcon USB SDP failed.\n");
348 return ret;
349 }
350
351 ret = devm_extcon_register_notifier(x->dev, x->edev,
352 EXTCON_CHG_USB_CDP,
353 &x->type_nb);
354 if (ret) {
355 dev_err(x->dev,
356 "register extcon USB CDP failed.\n");
357 return ret;
358 }
359
360 ret = devm_extcon_register_notifier(x->dev, x->edev,
361 EXTCON_CHG_USB_DCP,
362 &x->type_nb);
363 if (ret) {
364 dev_err(x->dev,
365 "register extcon USB DCP failed.\n");
366 return ret;
367 }
368
369 ret = devm_extcon_register_notifier(x->dev, x->edev,
370 EXTCON_CHG_USB_ACA,
371 &x->type_nb);
372 if (ret) {
373 dev_err(x->dev,
374 "register extcon USB ACA failed.\n");
375 return ret;
376 }
377 }
378
379 if (x->id_nb.notifier_call) {
380 struct extcon_dev *id_ext;
381
382 if (x->id_edev)
383 id_ext = x->id_edev;
384 else
385 id_ext = x->edev;
386
387 ret = devm_extcon_register_notifier(x->dev, id_ext,
388 EXTCON_USB_HOST,
389 &x->id_nb);
390 if (ret < 0) {
391 dev_err(x->dev,
392 "register ID notifier failed\n");
393 return ret;
394 }
395 }
396 }
397
398 if (x->type_nb.notifier_call)
399 __usb_phy_get_charger_type(x);
400
401 return 0;
402}
403
404/**
405 * devm_usb_get_phy - find the USB PHY
406 * @dev - device that requests this phy
407 * @type - the type of the phy the controller requires
408 *
409 * Gets the phy using usb_get_phy(), and associates a device with it using
410 * devres. On driver detach, release function is invoked on the devres data,
411 * then, devres data is freed.
412 *
413 * For use by USB host and peripheral drivers.
414 */
415struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
416{
417 struct usb_phy **ptr, *phy;
418
419 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
420 if (!ptr)
421 return ERR_PTR(-ENOMEM);
422
423 phy = usb_get_phy(type);
424 if (!IS_ERR(phy)) {
425 *ptr = phy;
426 devres_add(dev, ptr);
427 } else
428 devres_free(ptr);
429
430 return phy;
431}
432EXPORT_SYMBOL_GPL(devm_usb_get_phy);
433
434/**
435 * usb_get_phy - find the USB PHY
436 * @type - the type of the phy the controller requires
437 *
438 * Returns the phy driver, after getting a refcount to it; or
439 * -ENODEV if there is no such phy. The caller is responsible for
440 * calling usb_put_phy() to release that count.
441 *
442 * For use by USB host and peripheral drivers.
443 */
444struct usb_phy *usb_get_phy(enum usb_phy_type type)
445{
446 struct usb_phy *phy = NULL;
447 unsigned long flags;
448
449 spin_lock_irqsave(&phy_lock, flags);
450
451 phy = __usb_find_phy(&phy_list, type);
452 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
453 pr_debug("PHY: unable to find transceiver of type %s\n",
454 usb_phy_type_string(type));
455 if (!IS_ERR(phy))
456 phy = ERR_PTR(-ENODEV);
457
458 goto err0;
459 }
460
461 get_device(phy->dev);
462
463err0:
464 spin_unlock_irqrestore(&phy_lock, flags);
465
466 return phy;
467}
468EXPORT_SYMBOL_GPL(usb_get_phy);
469
470/**
471 * devm_usb_get_phy_by_node - find the USB PHY by device_node
472 * @dev - device that requests this phy
473 * @node - the device_node for the phy device.
474 * @nb - a notifier_block to register with the phy.
475 *
476 * Returns the phy driver associated with the given device_node,
477 * after getting a refcount to it, -ENODEV if there is no such phy or
478 * -EPROBE_DEFER if the device is not yet loaded. While at that, it
479 * also associates the device with
480 * the phy using devres. On driver detach, release function is invoked
481 * on the devres data, then, devres data is freed.
482 *
483 * For use by peripheral drivers for devices related to a phy,
484 * such as a charger.
485 */
486struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
487 struct device_node *node,
488 struct notifier_block *nb)
489{
490 struct usb_phy *phy = ERR_PTR(-ENOMEM);
491 struct phy_devm *ptr;
492 unsigned long flags;
493
494 ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL);
495 if (!ptr) {
496 dev_dbg(dev, "failed to allocate memory for devres\n");
497 goto err0;
498 }
499
500 spin_lock_irqsave(&phy_lock, flags);
501
502 phy = __of_usb_find_phy(node);
503 if (IS_ERR(phy)) {
504 devres_free(ptr);
505 goto err1;
506 }
507
508 if (!try_module_get(phy->dev->driver->owner)) {
509 phy = ERR_PTR(-ENODEV);
510 devres_free(ptr);
511 goto err1;
512 }
513 if (nb)
514 usb_register_notifier(phy, nb);
515 ptr->phy = phy;
516 ptr->nb = nb;
517 devres_add(dev, ptr);
518
519 get_device(phy->dev);
520
521err1:
522 spin_unlock_irqrestore(&phy_lock, flags);
523
524err0:
525
526 return phy;
527}
528EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node);
529
530/**
531 * devm_usb_get_phy_by_phandle - find the USB PHY by phandle
532 * @dev - device that requests this phy
533 * @phandle - name of the property holding the phy phandle value
534 * @index - the index of the phy
535 *
536 * Returns the phy driver associated with the given phandle value,
537 * after getting a refcount to it, -ENODEV if there is no such phy or
538 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
539 * not yet loaded. While at that, it also associates the device with
540 * the phy using devres. On driver detach, release function is invoked
541 * on the devres data, then, devres data is freed.
542 *
543 * For use by USB host and peripheral drivers.
544 */
545struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
546 const char *phandle, u8 index)
547{
548 struct device_node *node;
549 struct usb_phy *phy;
550
551 if (!dev->of_node) {
552 dev_dbg(dev, "device does not have a device node entry\n");
553 return ERR_PTR(-EINVAL);
554 }
555
556 node = of_parse_phandle(dev->of_node, phandle, index);
557 if (!node) {
558 dev_dbg(dev, "failed to get %s phandle in %pOF node\n", phandle,
559 dev->of_node);
560 return ERR_PTR(-ENODEV);
561 }
562 phy = devm_usb_get_phy_by_node(dev, node, NULL);
563 of_node_put(node);
564 return phy;
565}
566EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
567
568/**
569 * devm_usb_put_phy - release the USB PHY
570 * @dev - device that wants to release this phy
571 * @phy - the phy returned by devm_usb_get_phy()
572 *
573 * destroys the devres associated with this phy and invokes usb_put_phy
574 * to release the phy.
575 *
576 * For use by USB host and peripheral drivers.
577 */
578void devm_usb_put_phy(struct device *dev, struct usb_phy *phy)
579{
580 int r;
581
582 r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
583 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
584}
585EXPORT_SYMBOL_GPL(devm_usb_put_phy);
586
587/**
588 * usb_put_phy - release the USB PHY
589 * @x: the phy returned by usb_get_phy()
590 *
591 * Releases a refcount the caller received from usb_get_phy().
592 *
593 * For use by USB host and peripheral drivers.
594 */
595void usb_put_phy(struct usb_phy *x)
596{
597 if (x) {
598 struct module *owner = x->dev->driver->owner;
599
600 put_device(x->dev);
601 module_put(owner);
602 }
603}
604EXPORT_SYMBOL_GPL(usb_put_phy);
605
606/**
607 * usb_add_phy - declare the USB PHY
608 * @x: the USB phy to be used; or NULL
609 * @type - the type of this PHY
610 *
611 * This call is exclusively for use by phy drivers, which
612 * coordinate the activities of drivers for host and peripheral
613 * controllers, and in some cases for VBUS current regulation.
614 */
615int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
616{
617 int ret = 0;
618 unsigned long flags;
619 struct usb_phy *phy;
620
621 if (x->type != USB_PHY_TYPE_UNDEFINED) {
622 dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
623 return -EINVAL;
624 }
625
626 usb_charger_init(x);
627 ret = usb_add_extcon(x);
628 if (ret)
629 return ret;
630
631 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
632
633 spin_lock_irqsave(&phy_lock, flags);
634
635 list_for_each_entry(phy, &phy_list, head) {
636 if (phy->type == type) {
637 ret = -EBUSY;
638 dev_err(x->dev, "transceiver type %s already exists\n",
639 usb_phy_type_string(type));
640 goto out;
641 }
642 }
643
644 x->type = type;
645 list_add_tail(&x->head, &phy_list);
646
647out:
648 spin_unlock_irqrestore(&phy_lock, flags);
649 return ret;
650}
651EXPORT_SYMBOL_GPL(usb_add_phy);
652
653/**
654 * usb_add_phy_dev - declare the USB PHY
655 * @x: the USB phy to be used; or NULL
656 *
657 * This call is exclusively for use by phy drivers, which
658 * coordinate the activities of drivers for host and peripheral
659 * controllers, and in some cases for VBUS current regulation.
660 */
661int usb_add_phy_dev(struct usb_phy *x)
662{
663 unsigned long flags;
664 int ret;
665
666 if (!x->dev) {
667 dev_err(x->dev, "no device provided for PHY\n");
668 return -EINVAL;
669 }
670
671 usb_charger_init(x);
672 ret = usb_add_extcon(x);
673 if (ret)
674 return ret;
675
676 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
677
678 spin_lock_irqsave(&phy_lock, flags);
679 list_add_tail(&x->head, &phy_list);
680 spin_unlock_irqrestore(&phy_lock, flags);
681
682 return 0;
683}
684EXPORT_SYMBOL_GPL(usb_add_phy_dev);
685
686/**
687 * usb_remove_phy - remove the OTG PHY
688 * @x: the USB OTG PHY to be removed;
689 *
690 * This reverts the effects of usb_add_phy
691 */
692void usb_remove_phy(struct usb_phy *x)
693{
694 unsigned long flags;
695
696 spin_lock_irqsave(&phy_lock, flags);
697 if (x)
698 list_del(&x->head);
699 spin_unlock_irqrestore(&phy_lock, flags);
700}
701EXPORT_SYMBOL_GPL(usb_remove_phy);
702
703/**
704 * usb_phy_set_event - set event to phy event
705 * @x: the phy returned by usb_get_phy();
706 *
707 * This sets event to phy event
708 */
709void usb_phy_set_event(struct usb_phy *x, unsigned long event)
710{
711 x->last_event = event;
712}
713EXPORT_SYMBOL_GPL(usb_phy_set_event);