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5fd54ace | 1 | // SPDX-License-Identifier: GPL-2.0+ |
cedf8602 SH |
2 | /* |
3 | * phy.c -- USB phy handling | |
4 | * | |
5 | * Copyright (C) 2004-2013 Texas Instruments | |
cedf8602 SH |
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 | ||
a9081a00 BW |
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 | ||
cedf8602 SH |
29 | static LIST_HEAD(phy_list); |
30 | static LIST_HEAD(phy_bind_list); | |
31 | static DEFINE_SPINLOCK(phy_lock); | |
32 | ||
e842b84c N |
33 | struct phy_devm { |
34 | struct usb_phy *phy; | |
35 | struct notifier_block *nb; | |
36 | }; | |
37 | ||
cedf8602 SH |
38 | static struct usb_phy *__usb_find_phy(struct list_head *list, |
39 | enum usb_phy_type type) | |
40 | { | |
41 | struct usb_phy *phy = NULL; | |
42 | ||
43 | list_for_each_entry(phy, list, head) { | |
44 | if (phy->type != type) | |
45 | continue; | |
46 | ||
47 | return phy; | |
48 | } | |
49 | ||
0df8fc37 | 50 | return ERR_PTR(-ENODEV); |
cedf8602 SH |
51 | } |
52 | ||
53 | static struct usb_phy *__usb_find_phy_dev(struct device *dev, | |
54 | struct list_head *list, u8 index) | |
55 | { | |
56 | struct usb_phy_bind *phy_bind = NULL; | |
57 | ||
58 | list_for_each_entry(phy_bind, list, list) { | |
59 | if (!(strcmp(phy_bind->dev_name, dev_name(dev))) && | |
60 | phy_bind->index == index) { | |
61 | if (phy_bind->phy) | |
62 | return phy_bind->phy; | |
63 | else | |
64 | return ERR_PTR(-EPROBE_DEFER); | |
65 | } | |
66 | } | |
67 | ||
68 | return ERR_PTR(-ENODEV); | |
69 | } | |
70 | ||
71 | static struct usb_phy *__of_usb_find_phy(struct device_node *node) | |
72 | { | |
73 | struct usb_phy *phy; | |
74 | ||
c818a94c TR |
75 | if (!of_device_is_available(node)) |
76 | return ERR_PTR(-ENODEV); | |
77 | ||
cedf8602 SH |
78 | list_for_each_entry(phy, &phy_list, head) { |
79 | if (node != phy->dev->of_node) | |
80 | continue; | |
81 | ||
82 | return phy; | |
83 | } | |
84 | ||
9c9d8249 | 85 | return ERR_PTR(-EPROBE_DEFER); |
cedf8602 SH |
86 | } |
87 | ||
a9081a00 BW |
88 | static void usb_phy_set_default_current(struct usb_phy *usb_phy) |
89 | { | |
90 | usb_phy->chg_cur.sdp_min = DEFAULT_SDP_CUR_MIN; | |
91 | usb_phy->chg_cur.sdp_max = DEFAULT_SDP_CUR_MAX; | |
92 | usb_phy->chg_cur.dcp_min = DEFAULT_DCP_CUR_MIN; | |
93 | usb_phy->chg_cur.dcp_max = DEFAULT_DCP_CUR_MAX; | |
94 | usb_phy->chg_cur.cdp_min = DEFAULT_CDP_CUR_MIN; | |
95 | usb_phy->chg_cur.cdp_max = DEFAULT_CDP_CUR_MAX; | |
96 | usb_phy->chg_cur.aca_min = DEFAULT_ACA_CUR_MIN; | |
97 | usb_phy->chg_cur.aca_max = DEFAULT_ACA_CUR_MAX; | |
98 | } | |
99 | ||
100 | /** | |
101 | * usb_phy_notify_charger_work - notify the USB charger state | |
102 | * @work - the charger work to notify the USB charger state | |
103 | * | |
104 | * This work can be issued when USB charger state has been changed or | |
105 | * USB charger current has been changed, then we can notify the current | |
106 | * what can be drawn to power user and the charger state to userspace. | |
107 | * | |
108 | * If we get the charger type from extcon subsystem, we can notify the | |
109 | * charger state to power user automatically by usb_phy_get_charger_type() | |
110 | * issuing from extcon subsystem. | |
111 | * | |
112 | * If we get the charger type from ->charger_detect() instead of extcon | |
113 | * subsystem, the usb phy driver should issue usb_phy_set_charger_state() | |
114 | * to set charger state when the charger state has been changed. | |
115 | */ | |
116 | static void usb_phy_notify_charger_work(struct work_struct *work) | |
117 | { | |
118 | struct usb_phy *usb_phy = container_of(work, struct usb_phy, chg_work); | |
119 | char uchger_state[50] = { 0 }; | |
120 | char *envp[] = { uchger_state, NULL }; | |
121 | unsigned int min, max; | |
122 | ||
123 | switch (usb_phy->chg_state) { | |
124 | case USB_CHARGER_PRESENT: | |
125 | usb_phy_get_charger_current(usb_phy, &min, &max); | |
126 | ||
127 | atomic_notifier_call_chain(&usb_phy->notifier, max, usb_phy); | |
128 | snprintf(uchger_state, ARRAY_SIZE(uchger_state), | |
129 | "USB_CHARGER_STATE=%s", "USB_CHARGER_PRESENT"); | |
130 | break; | |
131 | case USB_CHARGER_ABSENT: | |
132 | usb_phy_set_default_current(usb_phy); | |
133 | ||
134 | atomic_notifier_call_chain(&usb_phy->notifier, 0, usb_phy); | |
135 | snprintf(uchger_state, ARRAY_SIZE(uchger_state), | |
136 | "USB_CHARGER_STATE=%s", "USB_CHARGER_ABSENT"); | |
137 | break; | |
138 | default: | |
139 | dev_warn(usb_phy->dev, "Unknown USB charger state: %d\n", | |
140 | usb_phy->chg_state); | |
141 | return; | |
142 | } | |
143 | ||
144 | kobject_uevent_env(&usb_phy->dev->kobj, KOBJ_CHANGE, envp); | |
145 | } | |
146 | ||
147 | static void __usb_phy_get_charger_type(struct usb_phy *usb_phy) | |
148 | { | |
149 | if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_SDP) > 0) { | |
150 | usb_phy->chg_type = SDP_TYPE; | |
151 | usb_phy->chg_state = USB_CHARGER_PRESENT; | |
152 | } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_CDP) > 0) { | |
153 | usb_phy->chg_type = CDP_TYPE; | |
154 | usb_phy->chg_state = USB_CHARGER_PRESENT; | |
155 | } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_DCP) > 0) { | |
156 | usb_phy->chg_type = DCP_TYPE; | |
157 | usb_phy->chg_state = USB_CHARGER_PRESENT; | |
158 | } else if (extcon_get_state(usb_phy->edev, EXTCON_CHG_USB_ACA) > 0) { | |
159 | usb_phy->chg_type = ACA_TYPE; | |
160 | usb_phy->chg_state = USB_CHARGER_PRESENT; | |
161 | } else { | |
162 | usb_phy->chg_type = UNKNOWN_TYPE; | |
163 | usb_phy->chg_state = USB_CHARGER_ABSENT; | |
164 | } | |
165 | ||
166 | schedule_work(&usb_phy->chg_work); | |
167 | } | |
168 | ||
169 | /** | |
170 | * usb_phy_get_charger_type - get charger type from extcon subsystem | |
171 | * @nb -the notifier block to determine charger type | |
172 | * @state - the cable state | |
173 | * @data - private data | |
174 | * | |
175 | * Determin the charger type from extcon subsystem which also means the | |
176 | * charger state has been chaned, then we should notify this event. | |
177 | */ | |
178 | static int usb_phy_get_charger_type(struct notifier_block *nb, | |
179 | unsigned long state, void *data) | |
180 | { | |
181 | struct usb_phy *usb_phy = container_of(nb, struct usb_phy, type_nb); | |
182 | ||
183 | __usb_phy_get_charger_type(usb_phy); | |
184 | return NOTIFY_OK; | |
185 | } | |
186 | ||
187 | /** | |
188 | * usb_phy_set_charger_current - set the USB charger current | |
189 | * @usb_phy - the USB phy to be used | |
190 | * @mA - the current need to be set | |
191 | * | |
192 | * Usually we only change the charger default current when USB finished the | |
193 | * enumeration as one SDP charger. As one SDP charger, usb_phy_set_power() | |
194 | * will issue this function to change charger current when after setting USB | |
195 | * configuration, or suspend/resume USB. For other type charger, we should | |
196 | * use the default charger current and we do not suggest to issue this function | |
197 | * to change the charger current. | |
198 | * | |
199 | * When USB charger current has been changed, we need to notify the power users. | |
200 | */ | |
201 | void usb_phy_set_charger_current(struct usb_phy *usb_phy, unsigned int mA) | |
202 | { | |
203 | switch (usb_phy->chg_type) { | |
204 | case SDP_TYPE: | |
205 | if (usb_phy->chg_cur.sdp_max == mA) | |
206 | return; | |
207 | ||
208 | usb_phy->chg_cur.sdp_max = (mA > DEFAULT_SDP_CUR_MAX_SS) ? | |
209 | DEFAULT_SDP_CUR_MAX_SS : mA; | |
210 | break; | |
211 | case DCP_TYPE: | |
212 | if (usb_phy->chg_cur.dcp_max == mA) | |
213 | return; | |
214 | ||
215 | usb_phy->chg_cur.dcp_max = (mA > DEFAULT_DCP_CUR_MAX) ? | |
216 | DEFAULT_DCP_CUR_MAX : mA; | |
217 | break; | |
218 | case CDP_TYPE: | |
219 | if (usb_phy->chg_cur.cdp_max == mA) | |
220 | return; | |
221 | ||
222 | usb_phy->chg_cur.cdp_max = (mA > DEFAULT_CDP_CUR_MAX) ? | |
223 | DEFAULT_CDP_CUR_MAX : mA; | |
224 | break; | |
225 | case ACA_TYPE: | |
226 | if (usb_phy->chg_cur.aca_max == mA) | |
227 | return; | |
228 | ||
229 | usb_phy->chg_cur.aca_max = (mA > DEFAULT_ACA_CUR_MAX) ? | |
230 | DEFAULT_ACA_CUR_MAX : mA; | |
231 | break; | |
232 | default: | |
233 | return; | |
234 | } | |
235 | ||
236 | schedule_work(&usb_phy->chg_work); | |
237 | } | |
238 | EXPORT_SYMBOL_GPL(usb_phy_set_charger_current); | |
239 | ||
240 | /** | |
241 | * usb_phy_get_charger_current - get the USB charger current | |
242 | * @usb_phy - the USB phy to be used | |
243 | * @min - the minimum current | |
244 | * @max - the maximum current | |
245 | * | |
246 | * Usually we will notify the maximum current to power user, but for some | |
247 | * special case, power user also need the minimum current value. Then the | |
248 | * power user can issue this function to get the suitable current. | |
249 | */ | |
250 | void usb_phy_get_charger_current(struct usb_phy *usb_phy, | |
251 | unsigned int *min, unsigned int *max) | |
252 | { | |
253 | switch (usb_phy->chg_type) { | |
254 | case SDP_TYPE: | |
255 | *min = usb_phy->chg_cur.sdp_min; | |
256 | *max = usb_phy->chg_cur.sdp_max; | |
257 | break; | |
258 | case DCP_TYPE: | |
259 | *min = usb_phy->chg_cur.dcp_min; | |
260 | *max = usb_phy->chg_cur.dcp_max; | |
261 | break; | |
262 | case CDP_TYPE: | |
263 | *min = usb_phy->chg_cur.cdp_min; | |
264 | *max = usb_phy->chg_cur.cdp_max; | |
265 | break; | |
266 | case ACA_TYPE: | |
267 | *min = usb_phy->chg_cur.aca_min; | |
268 | *max = usb_phy->chg_cur.aca_max; | |
269 | break; | |
270 | default: | |
271 | *min = 0; | |
272 | *max = 0; | |
273 | break; | |
274 | } | |
275 | } | |
276 | EXPORT_SYMBOL_GPL(usb_phy_get_charger_current); | |
277 | ||
278 | /** | |
279 | * usb_phy_set_charger_state - set the USB charger state | |
280 | * @usb_phy - the USB phy to be used | |
281 | * @state - the new state need to be set for charger | |
282 | * | |
283 | * The usb phy driver can issue this function when the usb phy driver | |
284 | * detected the charger state has been changed, in this case the charger | |
285 | * type should be get from ->charger_detect(). | |
286 | */ | |
287 | void usb_phy_set_charger_state(struct usb_phy *usb_phy, | |
288 | enum usb_charger_state state) | |
289 | { | |
290 | if (usb_phy->chg_state == state || !usb_phy->charger_detect) | |
291 | return; | |
292 | ||
293 | usb_phy->chg_state = state; | |
294 | if (usb_phy->chg_state == USB_CHARGER_PRESENT) | |
295 | usb_phy->chg_type = usb_phy->charger_detect(usb_phy); | |
296 | else | |
297 | usb_phy->chg_type = UNKNOWN_TYPE; | |
298 | ||
299 | schedule_work(&usb_phy->chg_work); | |
300 | } | |
301 | EXPORT_SYMBOL_GPL(usb_phy_set_charger_state); | |
302 | ||
cedf8602 SH |
303 | static void devm_usb_phy_release(struct device *dev, void *res) |
304 | { | |
305 | struct usb_phy *phy = *(struct usb_phy **)res; | |
306 | ||
307 | usb_put_phy(phy); | |
308 | } | |
309 | ||
e842b84c N |
310 | static void devm_usb_phy_release2(struct device *dev, void *_res) |
311 | { | |
312 | struct phy_devm *res = _res; | |
313 | ||
314 | if (res->nb) | |
315 | usb_unregister_notifier(res->phy, res->nb); | |
316 | usb_put_phy(res->phy); | |
317 | } | |
318 | ||
cedf8602 SH |
319 | static int devm_usb_phy_match(struct device *dev, void *res, void *match_data) |
320 | { | |
869aee0f AL |
321 | struct usb_phy **phy = res; |
322 | ||
323 | return *phy == match_data; | |
cedf8602 SH |
324 | } |
325 | ||
7d21114d BW |
326 | static int usb_add_extcon(struct usb_phy *x) |
327 | { | |
328 | int ret; | |
329 | ||
330 | if (of_property_read_bool(x->dev->of_node, "extcon")) { | |
331 | x->edev = extcon_get_edev_by_phandle(x->dev, 0); | |
332 | if (IS_ERR(x->edev)) | |
333 | return PTR_ERR(x->edev); | |
334 | ||
335 | x->id_edev = extcon_get_edev_by_phandle(x->dev, 1); | |
336 | if (IS_ERR(x->id_edev)) { | |
337 | x->id_edev = NULL; | |
338 | dev_info(x->dev, "No separate ID extcon device\n"); | |
339 | } | |
340 | ||
341 | if (x->vbus_nb.notifier_call) { | |
342 | ret = devm_extcon_register_notifier(x->dev, x->edev, | |
343 | EXTCON_USB, | |
344 | &x->vbus_nb); | |
345 | if (ret < 0) { | |
346 | dev_err(x->dev, | |
347 | "register VBUS notifier failed\n"); | |
348 | return ret; | |
349 | } | |
a9081a00 BW |
350 | } else { |
351 | x->type_nb.notifier_call = usb_phy_get_charger_type; | |
352 | ||
353 | ret = devm_extcon_register_notifier(x->dev, x->edev, | |
354 | EXTCON_CHG_USB_SDP, | |
355 | &x->type_nb); | |
356 | if (ret) { | |
357 | dev_err(x->dev, | |
358 | "register extcon USB SDP failed.\n"); | |
359 | return ret; | |
360 | } | |
361 | ||
362 | ret = devm_extcon_register_notifier(x->dev, x->edev, | |
363 | EXTCON_CHG_USB_CDP, | |
364 | &x->type_nb); | |
365 | if (ret) { | |
366 | dev_err(x->dev, | |
367 | "register extcon USB CDP failed.\n"); | |
368 | return ret; | |
369 | } | |
370 | ||
371 | ret = devm_extcon_register_notifier(x->dev, x->edev, | |
372 | EXTCON_CHG_USB_DCP, | |
373 | &x->type_nb); | |
374 | if (ret) { | |
375 | dev_err(x->dev, | |
376 | "register extcon USB DCP failed.\n"); | |
377 | return ret; | |
378 | } | |
379 | ||
380 | ret = devm_extcon_register_notifier(x->dev, x->edev, | |
381 | EXTCON_CHG_USB_ACA, | |
382 | &x->type_nb); | |
383 | if (ret) { | |
384 | dev_err(x->dev, | |
385 | "register extcon USB ACA failed.\n"); | |
386 | return ret; | |
387 | } | |
7d21114d BW |
388 | } |
389 | ||
390 | if (x->id_nb.notifier_call) { | |
391 | struct extcon_dev *id_ext; | |
392 | ||
393 | if (x->id_edev) | |
394 | id_ext = x->id_edev; | |
395 | else | |
396 | id_ext = x->edev; | |
397 | ||
398 | ret = devm_extcon_register_notifier(x->dev, id_ext, | |
399 | EXTCON_USB_HOST, | |
400 | &x->id_nb); | |
401 | if (ret < 0) { | |
402 | dev_err(x->dev, | |
403 | "register ID notifier failed\n"); | |
404 | return ret; | |
405 | } | |
406 | } | |
407 | } | |
408 | ||
a9081a00 BW |
409 | usb_phy_set_default_current(x); |
410 | INIT_WORK(&x->chg_work, usb_phy_notify_charger_work); | |
411 | x->chg_type = UNKNOWN_TYPE; | |
412 | x->chg_state = USB_CHARGER_DEFAULT; | |
413 | if (x->type_nb.notifier_call) | |
414 | __usb_phy_get_charger_type(x); | |
415 | ||
7d21114d BW |
416 | return 0; |
417 | } | |
418 | ||
cedf8602 SH |
419 | /** |
420 | * devm_usb_get_phy - find the USB PHY | |
421 | * @dev - device that requests this phy | |
422 | * @type - the type of the phy the controller requires | |
423 | * | |
424 | * Gets the phy using usb_get_phy(), and associates a device with it using | |
425 | * devres. On driver detach, release function is invoked on the devres data, | |
426 | * then, devres data is freed. | |
427 | * | |
428 | * For use by USB host and peripheral drivers. | |
429 | */ | |
430 | struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type) | |
431 | { | |
432 | struct usb_phy **ptr, *phy; | |
433 | ||
434 | ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL); | |
435 | if (!ptr) | |
7f4d1e7b | 436 | return ERR_PTR(-ENOMEM); |
cedf8602 SH |
437 | |
438 | phy = usb_get_phy(type); | |
439 | if (!IS_ERR(phy)) { | |
440 | *ptr = phy; | |
441 | devres_add(dev, ptr); | |
442 | } else | |
443 | devres_free(ptr); | |
444 | ||
445 | return phy; | |
446 | } | |
110ff6d0 | 447 | EXPORT_SYMBOL_GPL(devm_usb_get_phy); |
cedf8602 SH |
448 | |
449 | /** | |
450 | * usb_get_phy - find the USB PHY | |
451 | * @type - the type of the phy the controller requires | |
452 | * | |
453 | * Returns the phy driver, after getting a refcount to it; or | |
454 | * -ENODEV if there is no such phy. The caller is responsible for | |
455 | * calling usb_put_phy() to release that count. | |
456 | * | |
457 | * For use by USB host and peripheral drivers. | |
458 | */ | |
459 | struct usb_phy *usb_get_phy(enum usb_phy_type type) | |
460 | { | |
461 | struct usb_phy *phy = NULL; | |
462 | unsigned long flags; | |
463 | ||
464 | spin_lock_irqsave(&phy_lock, flags); | |
465 | ||
466 | phy = __usb_find_phy(&phy_list, type); | |
467 | if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) { | |
e9d123a5 | 468 | pr_debug("PHY: unable to find transceiver of type %s\n", |
cedf8602 | 469 | usb_phy_type_string(type)); |
9dc9cb0c MK |
470 | if (!IS_ERR(phy)) |
471 | phy = ERR_PTR(-ENODEV); | |
472 | ||
cedf8602 SH |
473 | goto err0; |
474 | } | |
475 | ||
476 | get_device(phy->dev); | |
477 | ||
478 | err0: | |
479 | spin_unlock_irqrestore(&phy_lock, flags); | |
480 | ||
481 | return phy; | |
482 | } | |
110ff6d0 | 483 | EXPORT_SYMBOL_GPL(usb_get_phy); |
cedf8602 | 484 | |
fb1928de | 485 | /** |
e842b84c | 486 | * devm_usb_get_phy_by_node - find the USB PHY by device_node |
cedf8602 | 487 | * @dev - device that requests this phy |
e842b84c N |
488 | * @node - the device_node for the phy device. |
489 | * @nb - a notifier_block to register with the phy. | |
cedf8602 | 490 | * |
e842b84c | 491 | * Returns the phy driver associated with the given device_node, |
cedf8602 | 492 | * after getting a refcount to it, -ENODEV if there is no such phy or |
e842b84c N |
493 | * -EPROBE_DEFER if the device is not yet loaded. While at that, it |
494 | * also associates the device with | |
cedf8602 SH |
495 | * the phy using devres. On driver detach, release function is invoked |
496 | * on the devres data, then, devres data is freed. | |
497 | * | |
e842b84c N |
498 | * For use by peripheral drivers for devices related to a phy, |
499 | * such as a charger. | |
cedf8602 | 500 | */ |
e842b84c N |
501 | struct usb_phy *devm_usb_get_phy_by_node(struct device *dev, |
502 | struct device_node *node, | |
503 | struct notifier_block *nb) | |
cedf8602 | 504 | { |
e842b84c N |
505 | struct usb_phy *phy = ERR_PTR(-ENOMEM); |
506 | struct phy_devm *ptr; | |
cedf8602 | 507 | unsigned long flags; |
cedf8602 | 508 | |
e842b84c | 509 | ptr = devres_alloc(devm_usb_phy_release2, sizeof(*ptr), GFP_KERNEL); |
cedf8602 SH |
510 | if (!ptr) { |
511 | dev_dbg(dev, "failed to allocate memory for devres\n"); | |
512 | goto err0; | |
513 | } | |
514 | ||
515 | spin_lock_irqsave(&phy_lock, flags); | |
516 | ||
517 | phy = __of_usb_find_phy(node); | |
c818a94c TR |
518 | if (IS_ERR(phy)) { |
519 | devres_free(ptr); | |
520 | goto err1; | |
521 | } | |
1290a958 | 522 | |
c818a94c TR |
523 | if (!try_module_get(phy->dev->driver->owner)) { |
524 | phy = ERR_PTR(-ENODEV); | |
cedf8602 SH |
525 | devres_free(ptr); |
526 | goto err1; | |
527 | } | |
e842b84c N |
528 | if (nb) |
529 | usb_register_notifier(phy, nb); | |
530 | ptr->phy = phy; | |
531 | ptr->nb = nb; | |
cedf8602 SH |
532 | devres_add(dev, ptr); |
533 | ||
534 | get_device(phy->dev); | |
535 | ||
536 | err1: | |
537 | spin_unlock_irqrestore(&phy_lock, flags); | |
538 | ||
539 | err0: | |
cedf8602 SH |
540 | |
541 | return phy; | |
542 | } | |
e842b84c N |
543 | EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_node); |
544 | ||
545 | /** | |
546 | * devm_usb_get_phy_by_phandle - find the USB PHY by phandle | |
547 | * @dev - device that requests this phy | |
548 | * @phandle - name of the property holding the phy phandle value | |
549 | * @index - the index of the phy | |
550 | * | |
551 | * Returns the phy driver associated with the given phandle value, | |
552 | * after getting a refcount to it, -ENODEV if there is no such phy or | |
553 | * -EPROBE_DEFER if there is a phandle to the phy, but the device is | |
554 | * not yet loaded. While at that, it also associates the device with | |
555 | * the phy using devres. On driver detach, release function is invoked | |
556 | * on the devres data, then, devres data is freed. | |
557 | * | |
558 | * For use by USB host and peripheral drivers. | |
559 | */ | |
560 | struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev, | |
561 | const char *phandle, u8 index) | |
562 | { | |
563 | struct device_node *node; | |
564 | struct usb_phy *phy; | |
565 | ||
566 | if (!dev->of_node) { | |
567 | dev_dbg(dev, "device does not have a device node entry\n"); | |
568 | return ERR_PTR(-EINVAL); | |
569 | } | |
570 | ||
571 | node = of_parse_phandle(dev->of_node, phandle, index); | |
572 | if (!node) { | |
d9241ff2 RH |
573 | dev_dbg(dev, "failed to get %s phandle in %pOF node\n", phandle, |
574 | dev->of_node); | |
e842b84c N |
575 | return ERR_PTR(-ENODEV); |
576 | } | |
577 | phy = devm_usb_get_phy_by_node(dev, node, NULL); | |
578 | of_node_put(node); | |
579 | return phy; | |
580 | } | |
110ff6d0 | 581 | EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle); |
cedf8602 SH |
582 | |
583 | /** | |
584 | * usb_get_phy_dev - find the USB PHY | |
585 | * @dev - device that requests this phy | |
586 | * @index - the index of the phy | |
587 | * | |
588 | * Returns the phy driver, after getting a refcount to it; or | |
589 | * -ENODEV if there is no such phy. The caller is responsible for | |
590 | * calling usb_put_phy() to release that count. | |
591 | * | |
592 | * For use by USB host and peripheral drivers. | |
593 | */ | |
594 | struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index) | |
595 | { | |
596 | struct usb_phy *phy = NULL; | |
597 | unsigned long flags; | |
598 | ||
599 | spin_lock_irqsave(&phy_lock, flags); | |
600 | ||
601 | phy = __usb_find_phy_dev(dev, &phy_bind_list, index); | |
602 | if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) { | |
e9d123a5 | 603 | dev_dbg(dev, "unable to find transceiver\n"); |
2c4e3dbf AS |
604 | if (!IS_ERR(phy)) |
605 | phy = ERR_PTR(-ENODEV); | |
606 | ||
cedf8602 SH |
607 | goto err0; |
608 | } | |
609 | ||
610 | get_device(phy->dev); | |
611 | ||
612 | err0: | |
613 | spin_unlock_irqrestore(&phy_lock, flags); | |
614 | ||
615 | return phy; | |
616 | } | |
110ff6d0 | 617 | EXPORT_SYMBOL_GPL(usb_get_phy_dev); |
cedf8602 SH |
618 | |
619 | /** | |
620 | * devm_usb_get_phy_dev - find the USB PHY using device ptr and index | |
621 | * @dev - device that requests this phy | |
622 | * @index - the index of the phy | |
623 | * | |
624 | * Gets the phy using usb_get_phy_dev(), and associates a device with it using | |
625 | * devres. On driver detach, release function is invoked on the devres data, | |
626 | * then, devres data is freed. | |
627 | * | |
628 | * For use by USB host and peripheral drivers. | |
629 | */ | |
630 | struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index) | |
631 | { | |
632 | struct usb_phy **ptr, *phy; | |
633 | ||
634 | ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL); | |
635 | if (!ptr) | |
636 | return NULL; | |
637 | ||
638 | phy = usb_get_phy_dev(dev, index); | |
639 | if (!IS_ERR(phy)) { | |
640 | *ptr = phy; | |
641 | devres_add(dev, ptr); | |
642 | } else | |
643 | devres_free(ptr); | |
644 | ||
645 | return phy; | |
646 | } | |
110ff6d0 | 647 | EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev); |
cedf8602 SH |
648 | |
649 | /** | |
650 | * devm_usb_put_phy - release the USB PHY | |
651 | * @dev - device that wants to release this phy | |
652 | * @phy - the phy returned by devm_usb_get_phy() | |
653 | * | |
654 | * destroys the devres associated with this phy and invokes usb_put_phy | |
655 | * to release the phy. | |
656 | * | |
657 | * For use by USB host and peripheral drivers. | |
658 | */ | |
659 | void devm_usb_put_phy(struct device *dev, struct usb_phy *phy) | |
660 | { | |
661 | int r; | |
662 | ||
663 | r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy); | |
664 | dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); | |
665 | } | |
110ff6d0 | 666 | EXPORT_SYMBOL_GPL(devm_usb_put_phy); |
cedf8602 SH |
667 | |
668 | /** | |
669 | * usb_put_phy - release the USB PHY | |
670 | * @x: the phy returned by usb_get_phy() | |
671 | * | |
672 | * Releases a refcount the caller received from usb_get_phy(). | |
673 | * | |
674 | * For use by USB host and peripheral drivers. | |
675 | */ | |
676 | void usb_put_phy(struct usb_phy *x) | |
677 | { | |
678 | if (x) { | |
679 | struct module *owner = x->dev->driver->owner; | |
680 | ||
681 | put_device(x->dev); | |
682 | module_put(owner); | |
683 | } | |
684 | } | |
110ff6d0 | 685 | EXPORT_SYMBOL_GPL(usb_put_phy); |
cedf8602 SH |
686 | |
687 | /** | |
688 | * usb_add_phy - declare the USB PHY | |
689 | * @x: the USB phy to be used; or NULL | |
690 | * @type - the type of this PHY | |
691 | * | |
692 | * This call is exclusively for use by phy drivers, which | |
693 | * coordinate the activities of drivers for host and peripheral | |
694 | * controllers, and in some cases for VBUS current regulation. | |
695 | */ | |
696 | int usb_add_phy(struct usb_phy *x, enum usb_phy_type type) | |
697 | { | |
698 | int ret = 0; | |
699 | unsigned long flags; | |
700 | struct usb_phy *phy; | |
701 | ||
702 | if (x->type != USB_PHY_TYPE_UNDEFINED) { | |
703 | dev_err(x->dev, "not accepting initialized PHY %s\n", x->label); | |
704 | return -EINVAL; | |
705 | } | |
706 | ||
7d21114d BW |
707 | ret = usb_add_extcon(x); |
708 | if (ret) | |
709 | return ret; | |
710 | ||
31e32227 NZ |
711 | ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier); |
712 | ||
cedf8602 SH |
713 | spin_lock_irqsave(&phy_lock, flags); |
714 | ||
715 | list_for_each_entry(phy, &phy_list, head) { | |
716 | if (phy->type == type) { | |
717 | ret = -EBUSY; | |
718 | dev_err(x->dev, "transceiver type %s already exists\n", | |
719 | usb_phy_type_string(type)); | |
720 | goto out; | |
721 | } | |
722 | } | |
723 | ||
724 | x->type = type; | |
725 | list_add_tail(&x->head, &phy_list); | |
726 | ||
727 | out: | |
728 | spin_unlock_irqrestore(&phy_lock, flags); | |
729 | return ret; | |
730 | } | |
110ff6d0 | 731 | EXPORT_SYMBOL_GPL(usb_add_phy); |
cedf8602 SH |
732 | |
733 | /** | |
734 | * usb_add_phy_dev - declare the USB PHY | |
735 | * @x: the USB phy to be used; or NULL | |
736 | * | |
737 | * This call is exclusively for use by phy drivers, which | |
738 | * coordinate the activities of drivers for host and peripheral | |
739 | * controllers, and in some cases for VBUS current regulation. | |
740 | */ | |
741 | int usb_add_phy_dev(struct usb_phy *x) | |
742 | { | |
743 | struct usb_phy_bind *phy_bind; | |
744 | unsigned long flags; | |
7d21114d | 745 | int ret; |
cedf8602 SH |
746 | |
747 | if (!x->dev) { | |
748 | dev_err(x->dev, "no device provided for PHY\n"); | |
749 | return -EINVAL; | |
750 | } | |
751 | ||
7d21114d BW |
752 | ret = usb_add_extcon(x); |
753 | if (ret) | |
754 | return ret; | |
755 | ||
31e32227 NZ |
756 | ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier); |
757 | ||
cedf8602 SH |
758 | spin_lock_irqsave(&phy_lock, flags); |
759 | list_for_each_entry(phy_bind, &phy_bind_list, list) | |
760 | if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev)))) | |
761 | phy_bind->phy = x; | |
762 | ||
763 | list_add_tail(&x->head, &phy_list); | |
764 | ||
765 | spin_unlock_irqrestore(&phy_lock, flags); | |
766 | return 0; | |
767 | } | |
110ff6d0 | 768 | EXPORT_SYMBOL_GPL(usb_add_phy_dev); |
cedf8602 SH |
769 | |
770 | /** | |
771 | * usb_remove_phy - remove the OTG PHY | |
772 | * @x: the USB OTG PHY to be removed; | |
773 | * | |
774 | * This reverts the effects of usb_add_phy | |
775 | */ | |
776 | void usb_remove_phy(struct usb_phy *x) | |
777 | { | |
778 | unsigned long flags; | |
779 | struct usb_phy_bind *phy_bind; | |
780 | ||
781 | spin_lock_irqsave(&phy_lock, flags); | |
782 | if (x) { | |
783 | list_for_each_entry(phy_bind, &phy_bind_list, list) | |
784 | if (phy_bind->phy == x) | |
785 | phy_bind->phy = NULL; | |
786 | list_del(&x->head); | |
787 | } | |
788 | spin_unlock_irqrestore(&phy_lock, flags); | |
789 | } | |
110ff6d0 | 790 | EXPORT_SYMBOL_GPL(usb_remove_phy); |
cedf8602 SH |
791 | |
792 | /** | |
793 | * usb_bind_phy - bind the phy and the controller that uses the phy | |
794 | * @dev_name: the device name of the device that will bind to the phy | |
795 | * @index: index to specify the port number | |
796 | * @phy_dev_name: the device name of the phy | |
797 | * | |
798 | * Fills the phy_bind structure with the dev_name and phy_dev_name. This will | |
799 | * be used when the phy driver registers the phy and when the controller | |
800 | * requests this phy. | |
801 | * | |
802 | * To be used by platform specific initialization code. | |
803 | */ | |
19d8cedd | 804 | int usb_bind_phy(const char *dev_name, u8 index, |
cedf8602 SH |
805 | const char *phy_dev_name) |
806 | { | |
807 | struct usb_phy_bind *phy_bind; | |
808 | unsigned long flags; | |
809 | ||
810 | phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL); | |
e9d123a5 | 811 | if (!phy_bind) |
cedf8602 | 812 | return -ENOMEM; |
cedf8602 SH |
813 | |
814 | phy_bind->dev_name = dev_name; | |
815 | phy_bind->phy_dev_name = phy_dev_name; | |
816 | phy_bind->index = index; | |
817 | ||
818 | spin_lock_irqsave(&phy_lock, flags); | |
819 | list_add_tail(&phy_bind->list, &phy_bind_list); | |
820 | spin_unlock_irqrestore(&phy_lock, flags); | |
821 | ||
822 | return 0; | |
823 | } | |
824 | EXPORT_SYMBOL_GPL(usb_bind_phy); | |
df9f7b31 KR |
825 | |
826 | /** | |
827 | * usb_phy_set_event - set event to phy event | |
828 | * @x: the phy returned by usb_get_phy(); | |
829 | * | |
830 | * This sets event to phy event | |
831 | */ | |
832 | void usb_phy_set_event(struct usb_phy *x, unsigned long event) | |
833 | { | |
834 | x->last_event = event; | |
835 | } | |
836 | EXPORT_SYMBOL_GPL(usb_phy_set_event); |