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1/*
2 * phy.c -- USB phy handling
3 *
4 * Copyright (C) 2004-2013 Texas Instruments
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11#include <linux/kernel.h>
12#include <linux/export.h>
13#include <linux/err.h>
14#include <linux/device.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/of.h>
18
19#include <linux/usb/phy.h>
20
21static LIST_HEAD(phy_list);
22static LIST_HEAD(phy_bind_list);
23static DEFINE_SPINLOCK(phy_lock);
24
25struct phy_devm {
26 struct usb_phy *phy;
27 struct notifier_block *nb;
28};
29
30static struct usb_phy *__usb_find_phy(struct list_head *list,
31 enum usb_phy_type type)
32{
33 struct usb_phy *phy = NULL;
34
35 list_for_each_entry(phy, list, head) {
36 if (phy->type != type)
37 continue;
38
39 return phy;
40 }
41
42 return ERR_PTR(-ENODEV);
43}
44
45static struct usb_phy *__usb_find_phy_dev(struct device *dev,
46 struct list_head *list, u8 index)
47{
48 struct usb_phy_bind *phy_bind = NULL;
49
50 list_for_each_entry(phy_bind, list, list) {
51 if (!(strcmp(phy_bind->dev_name, dev_name(dev))) &&
52 phy_bind->index == index) {
53 if (phy_bind->phy)
54 return phy_bind->phy;
55 else
56 return ERR_PTR(-EPROBE_DEFER);
57 }
58 }
59
60 return ERR_PTR(-ENODEV);
61}
62
63static struct usb_phy *__of_usb_find_phy(struct device_node *node)
64{
65 struct usb_phy *phy;
66
67 if (!of_device_is_available(node))
68 return ERR_PTR(-ENODEV);
69
70 list_for_each_entry(phy, &phy_list, head) {
71 if (node != phy->dev->of_node)
72 continue;
73
74 return phy;
75 }
76
77 return ERR_PTR(-EPROBE_DEFER);
78}
79
80static void devm_usb_phy_release(struct device *dev, void *res)
81{
82 struct usb_phy *phy = *(struct usb_phy **)res;
83
84 usb_put_phy(phy);
85}
86
87static void devm_usb_phy_release2(struct device *dev, void *_res)
88{
89 struct phy_devm *res = _res;
90
91 if (res->nb)
92 usb_unregister_notifier(res->phy, res->nb);
93 usb_put_phy(res->phy);
94}
95
96static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
97{
98 struct usb_phy **phy = res;
99
100 return *phy == match_data;
101}
102
103/**
104 * devm_usb_get_phy - find the USB PHY
105 * @dev - device that requests this phy
106 * @type - the type of the phy the controller requires
107 *
108 * Gets the phy using usb_get_phy(), and associates a device with it using
109 * devres. On driver detach, release function is invoked on the devres data,
110 * then, devres data is freed.
111 *
112 * For use by USB host and peripheral drivers.
113 */
114struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
115{
116 struct usb_phy **ptr, *phy;
117
118 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
119 if (!ptr)
120 return ERR_PTR(-ENOMEM);
121
122 phy = usb_get_phy(type);
123 if (!IS_ERR(phy)) {
124 *ptr = phy;
125 devres_add(dev, ptr);
126 } else
127 devres_free(ptr);
128
129 return phy;
130}
131EXPORT_SYMBOL_GPL(devm_usb_get_phy);
132
133/**
134 * usb_get_phy - find the USB PHY
135 * @type - the type of the phy the controller requires
136 *
137 * Returns the phy driver, after getting a refcount to it; or
138 * -ENODEV if there is no such phy. The caller is responsible for
139 * calling usb_put_phy() to release that count.
140 *
141 * For use by USB host and peripheral drivers.
142 */
143struct usb_phy *usb_get_phy(enum usb_phy_type type)
144{
145 struct usb_phy *phy = NULL;
146 unsigned long flags;
147
148 spin_lock_irqsave(&phy_lock, flags);
149
150 phy = __usb_find_phy(&phy_list, type);
151 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
152 pr_debug("PHY: unable to find transceiver of type %s\n",
153 usb_phy_type_string(type));
154 if (!IS_ERR(phy))
155 phy = ERR_PTR(-ENODEV);
156
157 goto err0;
158 }
159
160 get_device(phy->dev);
161
162err0:
163 spin_unlock_irqrestore(&phy_lock, flags);
164
165 return phy;
166}
167EXPORT_SYMBOL_GPL(usb_get_phy);
168
169/**
170 * devm_usb_get_phy_by_node - find the USB PHY by device_node
171 * @dev - device that requests this phy
172 * @node - the device_node for the phy device.
173 * @nb - a notifier_block to register with the phy.
174 *
175 * Returns the phy driver associated with the given device_node,
176 * after getting a refcount to it, -ENODEV if there is no such phy or
177 * -EPROBE_DEFER if the device is not yet loaded. While at that, it
178 * also associates the device with
179 * the phy using devres. On driver detach, release function is invoked
180 * on the devres data, then, devres data is freed.
181 *
182 * For use by peripheral drivers for devices related to a phy,
183 * such as a charger.
184 */
185struct usb_phy *devm_usb_get_phy_by_node(struct device *dev,
186 struct device_node *node,
187 struct notifier_block *nb)
188{
189 struct usb_phy *phy = ERR_PTR(-ENOMEM);
190 struct phy_devm *ptr;
191 unsigned long flags;
192
193 ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL);
194 if (!ptr) {
195 dev_dbg(dev, "failed to allocate memory for devres\n");
196 goto err0;
197 }
198
199 spin_lock_irqsave(&phy_lock, flags);
200
201 phy = __of_usb_find_phy(node);
202 if (IS_ERR(phy)) {
203 devres_free(ptr);
204 goto err1;
205 }
206
207 if (!try_module_get(phy->dev->driver->owner)) {
208 phy = ERR_PTR(-ENODEV);
209 devres_free(ptr);
210 goto err1;
211 }
212 if (nb)
213 usb_register_notifier(phy, nb);
214 ptr->phy = phy;
215 ptr->nb = nb;
216 devres_add(dev, ptr);
217
218 get_device(phy->dev);
219
220err1:
221 spin_unlock_irqrestore(&phy_lock, flags);
222
223err0:
224
225 return phy;
226}
227EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node);
228
229/**
230 * devm_usb_get_phy_by_phandle - find the USB PHY by phandle
231 * @dev - device that requests this phy
232 * @phandle - name of the property holding the phy phandle value
233 * @index - the index of the phy
234 *
235 * Returns the phy driver associated with the given phandle value,
236 * after getting a refcount to it, -ENODEV if there is no such phy or
237 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
238 * not yet loaded. While at that, it also associates the device with
239 * the phy using devres. On driver detach, release function is invoked
240 * on the devres data, then, devres data is freed.
241 *
242 * For use by USB host and peripheral drivers.
243 */
244struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
245 const char *phandle, u8 index)
246{
247 struct device_node *node;
248 struct usb_phy *phy;
249
250 if (!dev->of_node) {
251 dev_dbg(dev, "device does not have a device node entry\n");
252 return ERR_PTR(-EINVAL);
253 }
254
255 node = of_parse_phandle(dev->of_node, phandle, index);
256 if (!node) {
257 dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
258 dev->of_node->full_name);
259 return ERR_PTR(-ENODEV);
260 }
261 phy = devm_usb_get_phy_by_node(dev, node, NULL);
262 of_node_put(node);
263 return phy;
264}
265EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
266
267/**
268 * usb_get_phy_dev - find the USB PHY
269 * @dev - device that requests this phy
270 * @index - the index of the phy
271 *
272 * Returns the phy driver, after getting a refcount to it; or
273 * -ENODEV if there is no such phy. The caller is responsible for
274 * calling usb_put_phy() to release that count.
275 *
276 * For use by USB host and peripheral drivers.
277 */
278struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index)
279{
280 struct usb_phy *phy = NULL;
281 unsigned long flags;
282
283 spin_lock_irqsave(&phy_lock, flags);
284
285 phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
286 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
287 dev_dbg(dev, "unable to find transceiver\n");
288 if (!IS_ERR(phy))
289 phy = ERR_PTR(-ENODEV);
290
291 goto err0;
292 }
293
294 get_device(phy->dev);
295
296err0:
297 spin_unlock_irqrestore(&phy_lock, flags);
298
299 return phy;
300}
301EXPORT_SYMBOL_GPL(usb_get_phy_dev);
302
303/**
304 * devm_usb_get_phy_dev - find the USB PHY using device ptr and index
305 * @dev - device that requests this phy
306 * @index - the index of the phy
307 *
308 * Gets the phy using usb_get_phy_dev(), and associates a device with it using
309 * devres. On driver detach, release function is invoked on the devres data,
310 * then, devres data is freed.
311 *
312 * For use by USB host and peripheral drivers.
313 */
314struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
315{
316 struct usb_phy **ptr, *phy;
317
318 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
319 if (!ptr)
320 return NULL;
321
322 phy = usb_get_phy_dev(dev, index);
323 if (!IS_ERR(phy)) {
324 *ptr = phy;
325 devres_add(dev, ptr);
326 } else
327 devres_free(ptr);
328
329 return phy;
330}
331EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev);
332
333/**
334 * devm_usb_put_phy - release the USB PHY
335 * @dev - device that wants to release this phy
336 * @phy - the phy returned by devm_usb_get_phy()
337 *
338 * destroys the devres associated with this phy and invokes usb_put_phy
339 * to release the phy.
340 *
341 * For use by USB host and peripheral drivers.
342 */
343void devm_usb_put_phy(struct device *dev, struct usb_phy *phy)
344{
345 int r;
346
347 r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
348 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
349}
350EXPORT_SYMBOL_GPL(devm_usb_put_phy);
351
352/**
353 * usb_put_phy - release the USB PHY
354 * @x: the phy returned by usb_get_phy()
355 *
356 * Releases a refcount the caller received from usb_get_phy().
357 *
358 * For use by USB host and peripheral drivers.
359 */
360void usb_put_phy(struct usb_phy *x)
361{
362 if (x) {
363 struct module *owner = x->dev->driver->owner;
364
365 put_device(x->dev);
366 module_put(owner);
367 }
368}
369EXPORT_SYMBOL_GPL(usb_put_phy);
370
371/**
372 * usb_add_phy - declare the USB PHY
373 * @x: the USB phy to be used; or NULL
374 * @type - the type of this PHY
375 *
376 * This call is exclusively for use by phy drivers, which
377 * coordinate the activities of drivers for host and peripheral
378 * controllers, and in some cases for VBUS current regulation.
379 */
380int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
381{
382 int ret = 0;
383 unsigned long flags;
384 struct usb_phy *phy;
385
386 if (x->type != USB_PHY_TYPE_UNDEFINED) {
387 dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
388 return -EINVAL;
389 }
390
391 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
392
393 spin_lock_irqsave(&phy_lock, flags);
394
395 list_for_each_entry(phy, &phy_list, head) {
396 if (phy->type == type) {
397 ret = -EBUSY;
398 dev_err(x->dev, "transceiver type %s already exists\n",
399 usb_phy_type_string(type));
400 goto out;
401 }
402 }
403
404 x->type = type;
405 list_add_tail(&x->head, &phy_list);
406
407out:
408 spin_unlock_irqrestore(&phy_lock, flags);
409 return ret;
410}
411EXPORT_SYMBOL_GPL(usb_add_phy);
412
413/**
414 * usb_add_phy_dev - declare the USB PHY
415 * @x: the USB phy to be used; or NULL
416 *
417 * This call is exclusively for use by phy drivers, which
418 * coordinate the activities of drivers for host and peripheral
419 * controllers, and in some cases for VBUS current regulation.
420 */
421int usb_add_phy_dev(struct usb_phy *x)
422{
423 struct usb_phy_bind *phy_bind;
424 unsigned long flags;
425
426 if (!x->dev) {
427 dev_err(x->dev, "no device provided for PHY\n");
428 return -EINVAL;
429 }
430
431 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
432
433 spin_lock_irqsave(&phy_lock, flags);
434 list_for_each_entry(phy_bind, &phy_bind_list, list)
435 if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev))))
436 phy_bind->phy = x;
437
438 list_add_tail(&x->head, &phy_list);
439
440 spin_unlock_irqrestore(&phy_lock, flags);
441 return 0;
442}
443EXPORT_SYMBOL_GPL(usb_add_phy_dev);
444
445/**
446 * usb_remove_phy - remove the OTG PHY
447 * @x: the USB OTG PHY to be removed;
448 *
449 * This reverts the effects of usb_add_phy
450 */
451void usb_remove_phy(struct usb_phy *x)
452{
453 unsigned long flags;
454 struct usb_phy_bind *phy_bind;
455
456 spin_lock_irqsave(&phy_lock, flags);
457 if (x) {
458 list_for_each_entry(phy_bind, &phy_bind_list, list)
459 if (phy_bind->phy == x)
460 phy_bind->phy = NULL;
461 list_del(&x->head);
462 }
463 spin_unlock_irqrestore(&phy_lock, flags);
464}
465EXPORT_SYMBOL_GPL(usb_remove_phy);
466
467/**
468 * usb_bind_phy - bind the phy and the controller that uses the phy
469 * @dev_name: the device name of the device that will bind to the phy
470 * @index: index to specify the port number
471 * @phy_dev_name: the device name of the phy
472 *
473 * Fills the phy_bind structure with the dev_name and phy_dev_name. This will
474 * be used when the phy driver registers the phy and when the controller
475 * requests this phy.
476 *
477 * To be used by platform specific initialization code.
478 */
479int usb_bind_phy(const char *dev_name, u8 index,
480 const char *phy_dev_name)
481{
482 struct usb_phy_bind *phy_bind;
483 unsigned long flags;
484
485 phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
486 if (!phy_bind)
487 return -ENOMEM;
488
489 phy_bind->dev_name = dev_name;
490 phy_bind->phy_dev_name = phy_dev_name;
491 phy_bind->index = index;
492
493 spin_lock_irqsave(&phy_lock, flags);
494 list_add_tail(&phy_bind->list, &phy_bind_list);
495 spin_unlock_irqrestore(&phy_lock, flags);
496
497 return 0;
498}
499EXPORT_SYMBOL_GPL(usb_bind_phy);
500
501/**
502 * usb_phy_set_event - set event to phy event
503 * @x: the phy returned by usb_get_phy();
504 *
505 * This sets event to phy event
506 */
507void usb_phy_set_event(struct usb_phy *x, unsigned long event)
508{
509 x->last_event = event;
510}
511EXPORT_SYMBOL_GPL(usb_phy_set_event);
1/*
2 * phy.c -- USB phy handling
3 *
4 * Copyright (C) 2004-2013 Texas Instruments
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11#include <linux/kernel.h>
12#include <linux/export.h>
13#include <linux/err.h>
14#include <linux/device.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/of.h>
18
19#include <linux/usb/phy.h>
20
21static LIST_HEAD(phy_list);
22static LIST_HEAD(phy_bind_list);
23static DEFINE_SPINLOCK(phy_lock);
24
25static struct usb_phy *__usb_find_phy(struct list_head *list,
26 enum usb_phy_type type)
27{
28 struct usb_phy *phy = NULL;
29
30 list_for_each_entry(phy, list, head) {
31 if (phy->type != type)
32 continue;
33
34 return phy;
35 }
36
37 return ERR_PTR(-ENODEV);
38}
39
40static struct usb_phy *__usb_find_phy_dev(struct device *dev,
41 struct list_head *list, u8 index)
42{
43 struct usb_phy_bind *phy_bind = NULL;
44
45 list_for_each_entry(phy_bind, list, list) {
46 if (!(strcmp(phy_bind->dev_name, dev_name(dev))) &&
47 phy_bind->index == index) {
48 if (phy_bind->phy)
49 return phy_bind->phy;
50 else
51 return ERR_PTR(-EPROBE_DEFER);
52 }
53 }
54
55 return ERR_PTR(-ENODEV);
56}
57
58static struct usb_phy *__of_usb_find_phy(struct device_node *node)
59{
60 struct usb_phy *phy;
61
62 list_for_each_entry(phy, &phy_list, head) {
63 if (node != phy->dev->of_node)
64 continue;
65
66 return phy;
67 }
68
69 return ERR_PTR(-ENODEV);
70}
71
72static void devm_usb_phy_release(struct device *dev, void *res)
73{
74 struct usb_phy *phy = *(struct usb_phy **)res;
75
76 usb_put_phy(phy);
77}
78
79static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
80{
81 return res == match_data;
82}
83
84/**
85 * devm_usb_get_phy - find the USB PHY
86 * @dev - device that requests this phy
87 * @type - the type of the phy the controller requires
88 *
89 * Gets the phy using usb_get_phy(), and associates a device with it using
90 * devres. On driver detach, release function is invoked on the devres data,
91 * then, devres data is freed.
92 *
93 * For use by USB host and peripheral drivers.
94 */
95struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
96{
97 struct usb_phy **ptr, *phy;
98
99 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
100 if (!ptr)
101 return ERR_PTR(-ENOMEM);
102
103 phy = usb_get_phy(type);
104 if (!IS_ERR(phy)) {
105 *ptr = phy;
106 devres_add(dev, ptr);
107 } else
108 devres_free(ptr);
109
110 return phy;
111}
112EXPORT_SYMBOL_GPL(devm_usb_get_phy);
113
114/**
115 * usb_get_phy - find the USB PHY
116 * @type - the type of the phy the controller requires
117 *
118 * Returns the phy driver, after getting a refcount to it; or
119 * -ENODEV if there is no such phy. The caller is responsible for
120 * calling usb_put_phy() to release that count.
121 *
122 * For use by USB host and peripheral drivers.
123 */
124struct usb_phy *usb_get_phy(enum usb_phy_type type)
125{
126 struct usb_phy *phy = NULL;
127 unsigned long flags;
128
129 spin_lock_irqsave(&phy_lock, flags);
130
131 phy = __usb_find_phy(&phy_list, type);
132 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
133 pr_debug("PHY: unable to find transceiver of type %s\n",
134 usb_phy_type_string(type));
135 if (!IS_ERR(phy))
136 phy = ERR_PTR(-ENODEV);
137
138 goto err0;
139 }
140
141 get_device(phy->dev);
142
143err0:
144 spin_unlock_irqrestore(&phy_lock, flags);
145
146 return phy;
147}
148EXPORT_SYMBOL_GPL(usb_get_phy);
149
150 /**
151 * devm_usb_get_phy_by_phandle - find the USB PHY by phandle
152 * @dev - device that requests this phy
153 * @phandle - name of the property holding the phy phandle value
154 * @index - the index of the phy
155 *
156 * Returns the phy driver associated with the given phandle value,
157 * after getting a refcount to it, -ENODEV if there is no such phy or
158 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
159 * not yet loaded. While at that, it also associates the device with
160 * the phy using devres. On driver detach, release function is invoked
161 * on the devres data, then, devres data is freed.
162 *
163 * For use by USB host and peripheral drivers.
164 */
165struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
166 const char *phandle, u8 index)
167{
168 struct usb_phy *phy = ERR_PTR(-ENOMEM), **ptr;
169 unsigned long flags;
170 struct device_node *node;
171
172 if (!dev->of_node) {
173 dev_dbg(dev, "device does not have a device node entry\n");
174 return ERR_PTR(-EINVAL);
175 }
176
177 node = of_parse_phandle(dev->of_node, phandle, index);
178 if (!node) {
179 dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
180 dev->of_node->full_name);
181 return ERR_PTR(-ENODEV);
182 }
183
184 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
185 if (!ptr) {
186 dev_dbg(dev, "failed to allocate memory for devres\n");
187 goto err0;
188 }
189
190 spin_lock_irqsave(&phy_lock, flags);
191
192 phy = __of_usb_find_phy(node);
193 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
194 phy = ERR_PTR(-EPROBE_DEFER);
195 devres_free(ptr);
196 goto err1;
197 }
198
199 *ptr = phy;
200 devres_add(dev, ptr);
201
202 get_device(phy->dev);
203
204err1:
205 spin_unlock_irqrestore(&phy_lock, flags);
206
207err0:
208 of_node_put(node);
209
210 return phy;
211}
212EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
213
214/**
215 * usb_get_phy_dev - find the USB PHY
216 * @dev - device that requests this phy
217 * @index - the index of the phy
218 *
219 * Returns the phy driver, after getting a refcount to it; or
220 * -ENODEV if there is no such phy. The caller is responsible for
221 * calling usb_put_phy() to release that count.
222 *
223 * For use by USB host and peripheral drivers.
224 */
225struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index)
226{
227 struct usb_phy *phy = NULL;
228 unsigned long flags;
229
230 spin_lock_irqsave(&phy_lock, flags);
231
232 phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
233 if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
234 dev_dbg(dev, "unable to find transceiver\n");
235 goto err0;
236 }
237
238 get_device(phy->dev);
239
240err0:
241 spin_unlock_irqrestore(&phy_lock, flags);
242
243 return phy;
244}
245EXPORT_SYMBOL_GPL(usb_get_phy_dev);
246
247/**
248 * devm_usb_get_phy_dev - find the USB PHY using device ptr and index
249 * @dev - device that requests this phy
250 * @index - the index of the phy
251 *
252 * Gets the phy using usb_get_phy_dev(), and associates a device with it using
253 * devres. On driver detach, release function is invoked on the devres data,
254 * then, devres data is freed.
255 *
256 * For use by USB host and peripheral drivers.
257 */
258struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
259{
260 struct usb_phy **ptr, *phy;
261
262 ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
263 if (!ptr)
264 return NULL;
265
266 phy = usb_get_phy_dev(dev, index);
267 if (!IS_ERR(phy)) {
268 *ptr = phy;
269 devres_add(dev, ptr);
270 } else
271 devres_free(ptr);
272
273 return phy;
274}
275EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev);
276
277/**
278 * devm_usb_put_phy - release the USB PHY
279 * @dev - device that wants to release this phy
280 * @phy - the phy returned by devm_usb_get_phy()
281 *
282 * destroys the devres associated with this phy and invokes usb_put_phy
283 * to release the phy.
284 *
285 * For use by USB host and peripheral drivers.
286 */
287void devm_usb_put_phy(struct device *dev, struct usb_phy *phy)
288{
289 int r;
290
291 r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
292 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
293}
294EXPORT_SYMBOL_GPL(devm_usb_put_phy);
295
296/**
297 * usb_put_phy - release the USB PHY
298 * @x: the phy returned by usb_get_phy()
299 *
300 * Releases a refcount the caller received from usb_get_phy().
301 *
302 * For use by USB host and peripheral drivers.
303 */
304void usb_put_phy(struct usb_phy *x)
305{
306 if (x) {
307 struct module *owner = x->dev->driver->owner;
308
309 put_device(x->dev);
310 module_put(owner);
311 }
312}
313EXPORT_SYMBOL_GPL(usb_put_phy);
314
315/**
316 * usb_add_phy - declare the USB PHY
317 * @x: the USB phy to be used; or NULL
318 * @type - the type of this PHY
319 *
320 * This call is exclusively for use by phy drivers, which
321 * coordinate the activities of drivers for host and peripheral
322 * controllers, and in some cases for VBUS current regulation.
323 */
324int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
325{
326 int ret = 0;
327 unsigned long flags;
328 struct usb_phy *phy;
329
330 if (x->type != USB_PHY_TYPE_UNDEFINED) {
331 dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
332 return -EINVAL;
333 }
334
335 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
336
337 spin_lock_irqsave(&phy_lock, flags);
338
339 list_for_each_entry(phy, &phy_list, head) {
340 if (phy->type == type) {
341 ret = -EBUSY;
342 dev_err(x->dev, "transceiver type %s already exists\n",
343 usb_phy_type_string(type));
344 goto out;
345 }
346 }
347
348 x->type = type;
349 list_add_tail(&x->head, &phy_list);
350
351out:
352 spin_unlock_irqrestore(&phy_lock, flags);
353 return ret;
354}
355EXPORT_SYMBOL_GPL(usb_add_phy);
356
357/**
358 * usb_add_phy_dev - declare the USB PHY
359 * @x: the USB phy to be used; or NULL
360 *
361 * This call is exclusively for use by phy drivers, which
362 * coordinate the activities of drivers for host and peripheral
363 * controllers, and in some cases for VBUS current regulation.
364 */
365int usb_add_phy_dev(struct usb_phy *x)
366{
367 struct usb_phy_bind *phy_bind;
368 unsigned long flags;
369
370 if (!x->dev) {
371 dev_err(x->dev, "no device provided for PHY\n");
372 return -EINVAL;
373 }
374
375 ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
376
377 spin_lock_irqsave(&phy_lock, flags);
378 list_for_each_entry(phy_bind, &phy_bind_list, list)
379 if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev))))
380 phy_bind->phy = x;
381
382 list_add_tail(&x->head, &phy_list);
383
384 spin_unlock_irqrestore(&phy_lock, flags);
385 return 0;
386}
387EXPORT_SYMBOL_GPL(usb_add_phy_dev);
388
389/**
390 * usb_remove_phy - remove the OTG PHY
391 * @x: the USB OTG PHY to be removed;
392 *
393 * This reverts the effects of usb_add_phy
394 */
395void usb_remove_phy(struct usb_phy *x)
396{
397 unsigned long flags;
398 struct usb_phy_bind *phy_bind;
399
400 spin_lock_irqsave(&phy_lock, flags);
401 if (x) {
402 list_for_each_entry(phy_bind, &phy_bind_list, list)
403 if (phy_bind->phy == x)
404 phy_bind->phy = NULL;
405 list_del(&x->head);
406 }
407 spin_unlock_irqrestore(&phy_lock, flags);
408}
409EXPORT_SYMBOL_GPL(usb_remove_phy);
410
411/**
412 * usb_bind_phy - bind the phy and the controller that uses the phy
413 * @dev_name: the device name of the device that will bind to the phy
414 * @index: index to specify the port number
415 * @phy_dev_name: the device name of the phy
416 *
417 * Fills the phy_bind structure with the dev_name and phy_dev_name. This will
418 * be used when the phy driver registers the phy and when the controller
419 * requests this phy.
420 *
421 * To be used by platform specific initialization code.
422 */
423int usb_bind_phy(const char *dev_name, u8 index,
424 const char *phy_dev_name)
425{
426 struct usb_phy_bind *phy_bind;
427 unsigned long flags;
428
429 phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
430 if (!phy_bind)
431 return -ENOMEM;
432
433 phy_bind->dev_name = dev_name;
434 phy_bind->phy_dev_name = phy_dev_name;
435 phy_bind->index = index;
436
437 spin_lock_irqsave(&phy_lock, flags);
438 list_add_tail(&phy_bind->list, &phy_bind_list);
439 spin_unlock_irqrestore(&phy_lock, flags);
440
441 return 0;
442}
443EXPORT_SYMBOL_GPL(usb_bind_phy);