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04672fe6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
183b9b59 IPG |
2 | /* |
3 | * Ultra Wide Band | |
4 | * Life cycle of radio controllers | |
5 | * | |
6 | * Copyright (C) 2005-2006 Intel Corporation | |
7 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
8 | * | |
183b9b59 IPG |
9 | * FIXME: docs |
10 | * | |
11 | * A UWB radio controller is also a UWB device, so it embeds one... | |
12 | * | |
13 | * List of RCs comes from the 'struct class uwb_rc_class'. | |
14 | */ | |
15 | ||
16 | #include <linux/kernel.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/device.h> | |
19 | #include <linux/err.h> | |
20 | #include <linux/random.h> | |
21 | #include <linux/kdev_t.h> | |
22 | #include <linux/etherdevice.h> | |
23 | #include <linux/usb.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
475c0a6b | 25 | #include <linux/export.h> |
183b9b59 | 26 | |
183b9b59 IPG |
27 | #include "uwb-internal.h" |
28 | ||
9f3b795a | 29 | static int uwb_rc_index_match(struct device *dev, const void *data) |
183b9b59 | 30 | { |
9f3b795a | 31 | const int *index = data; |
183b9b59 IPG |
32 | struct uwb_rc *rc = dev_get_drvdata(dev); |
33 | ||
34 | if (rc->index == *index) | |
35 | return 1; | |
36 | return 0; | |
37 | } | |
38 | ||
39 | static struct uwb_rc *uwb_rc_find_by_index(int index) | |
40 | { | |
41 | struct device *dev; | |
42 | struct uwb_rc *rc = NULL; | |
43 | ||
44 | dev = class_find_device(&uwb_rc_class, NULL, &index, uwb_rc_index_match); | |
d6124b40 | 45 | if (dev) { |
183b9b59 | 46 | rc = dev_get_drvdata(dev); |
d6124b40 JH |
47 | put_device(dev); |
48 | } | |
49 | ||
183b9b59 IPG |
50 | return rc; |
51 | } | |
52 | ||
53 | static int uwb_rc_new_index(void) | |
54 | { | |
55 | int index = 0; | |
56 | ||
57 | for (;;) { | |
58 | if (!uwb_rc_find_by_index(index)) | |
59 | return index; | |
60 | if (++index < 0) | |
61 | index = 0; | |
62 | } | |
63 | } | |
64 | ||
65 | /** | |
66 | * Release the backing device of a uwb_rc that has been dynamically allocated. | |
67 | */ | |
68 | static void uwb_rc_sys_release(struct device *dev) | |
69 | { | |
70 | struct uwb_dev *uwb_dev = container_of(dev, struct uwb_dev, dev); | |
71 | struct uwb_rc *rc = container_of(uwb_dev, struct uwb_rc, uwb_dev); | |
72 | ||
183b9b59 | 73 | uwb_rc_ie_release(rc); |
183b9b59 IPG |
74 | kfree(rc); |
75 | } | |
76 | ||
77 | ||
78 | void uwb_rc_init(struct uwb_rc *rc) | |
79 | { | |
80 | struct uwb_dev *uwb_dev = &rc->uwb_dev; | |
81 | ||
82 | uwb_dev_init(uwb_dev); | |
83 | rc->uwb_dev.dev.class = &uwb_rc_class; | |
84 | rc->uwb_dev.dev.release = uwb_rc_sys_release; | |
85 | uwb_rc_neh_create(rc); | |
86 | rc->beaconing = -1; | |
87 | rc->scan_type = UWB_SCAN_DISABLED; | |
88 | INIT_LIST_HEAD(&rc->notifs_chain.list); | |
89 | mutex_init(&rc->notifs_chain.mutex); | |
fec1a593 SP |
90 | INIT_LIST_HEAD(&rc->uwb_beca.list); |
91 | mutex_init(&rc->uwb_beca.mutex); | |
183b9b59 IPG |
92 | uwb_drp_avail_init(rc); |
93 | uwb_rc_ie_init(rc); | |
94 | uwb_rsv_init(rc); | |
95 | uwb_rc_pal_init(rc); | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(uwb_rc_init); | |
98 | ||
99 | ||
100 | struct uwb_rc *uwb_rc_alloc(void) | |
101 | { | |
102 | struct uwb_rc *rc; | |
103 | rc = kzalloc(sizeof(*rc), GFP_KERNEL); | |
104 | if (rc == NULL) | |
105 | return NULL; | |
106 | uwb_rc_init(rc); | |
107 | return rc; | |
108 | } | |
109 | EXPORT_SYMBOL_GPL(uwb_rc_alloc); | |
110 | ||
d08e1ad9 TP |
111 | /* |
112 | * Show the ASIE that is broadcast in the UWB beacon by this uwb_rc device. | |
113 | */ | |
114 | static ssize_t ASIE_show(struct device *dev, | |
115 | struct device_attribute *attr, char *buf) | |
116 | { | |
117 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
118 | struct uwb_rc *rc = uwb_dev->rc; | |
119 | struct uwb_ie_hdr *ie; | |
120 | void *ptr; | |
121 | size_t len; | |
122 | int result = 0; | |
123 | ||
124 | /* init empty buffer. */ | |
125 | result = scnprintf(buf, PAGE_SIZE, "\n"); | |
126 | mutex_lock(&rc->ies_mutex); | |
127 | /* walk IEData looking for an ASIE. */ | |
128 | ptr = rc->ies->IEData; | |
129 | len = le16_to_cpu(rc->ies->wIELength); | |
130 | for (;;) { | |
131 | ie = uwb_ie_next(&ptr, &len); | |
132 | if (!ie) | |
133 | break; | |
134 | if (ie->element_id == UWB_APP_SPEC_IE) { | |
135 | result = uwb_ie_dump_hex(ie, | |
136 | ie->length + sizeof(struct uwb_ie_hdr), | |
137 | buf, PAGE_SIZE); | |
138 | break; | |
139 | } | |
140 | } | |
141 | mutex_unlock(&rc->ies_mutex); | |
142 | ||
143 | return result; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Update the ASIE that is broadcast in the UWB beacon by this uwb_rc device. | |
148 | */ | |
149 | static ssize_t ASIE_store(struct device *dev, | |
150 | struct device_attribute *attr, | |
151 | const char *buf, size_t size) | |
152 | { | |
153 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
154 | struct uwb_rc *rc = uwb_dev->rc; | |
155 | char ie_buf[255]; | |
156 | int result, ie_len = 0; | |
157 | const char *cur_ptr = buf; | |
158 | struct uwb_ie_hdr *ie; | |
159 | ||
160 | /* empty string means clear the ASIE. */ | |
161 | if (strlen(buf) <= 1) { | |
162 | uwb_rc_ie_rm(rc, UWB_APP_SPEC_IE); | |
163 | return size; | |
164 | } | |
165 | ||
166 | /* if non-empty string, convert string of hex chars to binary. */ | |
167 | while (ie_len < sizeof(ie_buf)) { | |
168 | int char_count; | |
169 | ||
170 | if (sscanf(cur_ptr, " %02hhX %n", | |
171 | &(ie_buf[ie_len]), &char_count) > 0) { | |
172 | ++ie_len; | |
173 | /* skip chars read from cur_ptr. */ | |
174 | cur_ptr += char_count; | |
175 | } else { | |
176 | break; | |
177 | } | |
178 | } | |
179 | ||
180 | /* validate IE length and type. */ | |
181 | if (ie_len < sizeof(struct uwb_ie_hdr)) { | |
182 | dev_err(dev, "%s: Invalid ASIE size %d.\n", __func__, ie_len); | |
183 | return -EINVAL; | |
184 | } | |
185 | ||
186 | ie = (struct uwb_ie_hdr *)ie_buf; | |
187 | if (ie->element_id != UWB_APP_SPEC_IE) { | |
188 | dev_err(dev, "%s: Invalid IE element type size = 0x%02X.\n", | |
189 | __func__, ie->element_id); | |
190 | return -EINVAL; | |
191 | } | |
192 | ||
193 | /* bounds check length field from user. */ | |
194 | if (ie->length > (ie_len - sizeof(struct uwb_ie_hdr))) | |
195 | ie->length = ie_len - sizeof(struct uwb_ie_hdr); | |
196 | ||
197 | /* | |
198 | * Valid ASIE received. Remove current ASIE then add the new one using | |
199 | * uwb_rc_ie_add. | |
200 | */ | |
201 | uwb_rc_ie_rm(rc, UWB_APP_SPEC_IE); | |
202 | ||
203 | result = uwb_rc_ie_add(rc, ie, ie->length + sizeof(struct uwb_ie_hdr)); | |
204 | ||
205 | return result >= 0 ? size : result; | |
206 | } | |
207 | static DEVICE_ATTR_RW(ASIE); | |
208 | ||
183b9b59 IPG |
209 | static struct attribute *rc_attrs[] = { |
210 | &dev_attr_mac_address.attr, | |
211 | &dev_attr_scan.attr, | |
212 | &dev_attr_beacon.attr, | |
d08e1ad9 | 213 | &dev_attr_ASIE.attr, |
183b9b59 IPG |
214 | NULL, |
215 | }; | |
216 | ||
f892a9bc | 217 | static const struct attribute_group rc_attr_group = { |
183b9b59 IPG |
218 | .attrs = rc_attrs, |
219 | }; | |
220 | ||
221 | /* | |
222 | * Registration of sysfs specific stuff | |
223 | */ | |
224 | static int uwb_rc_sys_add(struct uwb_rc *rc) | |
225 | { | |
226 | return sysfs_create_group(&rc->uwb_dev.dev.kobj, &rc_attr_group); | |
227 | } | |
228 | ||
229 | ||
230 | static void __uwb_rc_sys_rm(struct uwb_rc *rc) | |
231 | { | |
232 | sysfs_remove_group(&rc->uwb_dev.dev.kobj, &rc_attr_group); | |
233 | } | |
234 | ||
235 | /** | |
236 | * uwb_rc_mac_addr_setup - get an RC's EUI-48 address or set it | |
237 | * @rc: the radio controller. | |
238 | * | |
239 | * If the EUI-48 address is 00:00:00:00:00:00 or FF:FF:FF:FF:FF:FF | |
240 | * then a random locally administered EUI-48 is generated and set on | |
241 | * the device. The probability of address collisions is sufficiently | |
242 | * unlikely (1/2^40 = 9.1e-13) that they're not checked for. | |
243 | */ | |
244 | static | |
245 | int uwb_rc_mac_addr_setup(struct uwb_rc *rc) | |
246 | { | |
247 | int result; | |
248 | struct device *dev = &rc->uwb_dev.dev; | |
249 | struct uwb_dev *uwb_dev = &rc->uwb_dev; | |
250 | char devname[UWB_ADDR_STRSIZE]; | |
251 | struct uwb_mac_addr addr; | |
252 | ||
253 | result = uwb_rc_mac_addr_get(rc, &addr); | |
254 | if (result < 0) { | |
255 | dev_err(dev, "cannot retrieve UWB EUI-48 address: %d\n", result); | |
256 | return result; | |
257 | } | |
258 | ||
259 | if (uwb_mac_addr_unset(&addr) || uwb_mac_addr_bcast(&addr)) { | |
25985edc | 260 | addr.data[0] = 0x02; /* locally administered and unicast */ |
183b9b59 IPG |
261 | get_random_bytes(&addr.data[1], sizeof(addr.data)-1); |
262 | ||
263 | result = uwb_rc_mac_addr_set(rc, &addr); | |
264 | if (result < 0) { | |
265 | uwb_mac_addr_print(devname, sizeof(devname), &addr); | |
266 | dev_err(dev, "cannot set EUI-48 address %s: %d\n", | |
267 | devname, result); | |
268 | return result; | |
269 | } | |
270 | } | |
271 | uwb_dev->mac_addr = addr; | |
272 | return 0; | |
273 | } | |
274 | ||
275 | ||
276 | ||
277 | static int uwb_rc_setup(struct uwb_rc *rc) | |
278 | { | |
279 | int result; | |
280 | struct device *dev = &rc->uwb_dev.dev; | |
281 | ||
6fae35f9 | 282 | result = uwb_radio_setup(rc); |
183b9b59 | 283 | if (result < 0) { |
6fae35f9 | 284 | dev_err(dev, "cannot setup UWB radio: %d\n", result); |
183b9b59 IPG |
285 | goto error; |
286 | } | |
287 | result = uwb_rc_mac_addr_setup(rc); | |
288 | if (result < 0) { | |
289 | dev_err(dev, "cannot setup UWB MAC address: %d\n", result); | |
290 | goto error; | |
291 | } | |
292 | result = uwb_rc_dev_addr_assign(rc); | |
293 | if (result < 0) { | |
294 | dev_err(dev, "cannot assign UWB DevAddr: %d\n", result); | |
295 | goto error; | |
296 | } | |
297 | result = uwb_rc_ie_setup(rc); | |
298 | if (result < 0) { | |
299 | dev_err(dev, "cannot setup IE subsystem: %d\n", result); | |
300 | goto error_ie_setup; | |
301 | } | |
183b9b59 IPG |
302 | result = uwb_rsv_setup(rc); |
303 | if (result < 0) { | |
304 | dev_err(dev, "cannot setup reservation subsystem: %d\n", result); | |
305 | goto error_rsv_setup; | |
306 | } | |
307 | uwb_dbg_add_rc(rc); | |
308 | return 0; | |
309 | ||
310 | error_rsv_setup: | |
311 | uwb_rc_ie_release(rc); | |
312 | error_ie_setup: | |
313 | error: | |
314 | return result; | |
315 | } | |
316 | ||
317 | ||
318 | /** | |
319 | * Register a new UWB radio controller | |
320 | * | |
321 | * Did you call uwb_rc_init() on your rc? | |
322 | * | |
323 | * We assume that this is being called with a > 0 refcount on | |
324 | * it [through ops->{get|put}_device(). We'll take our own, though. | |
325 | * | |
326 | * @parent_dev is our real device, the one that provides the actual UWB device | |
327 | */ | |
328 | int uwb_rc_add(struct uwb_rc *rc, struct device *parent_dev, void *priv) | |
329 | { | |
330 | int result; | |
331 | struct device *dev; | |
332 | char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE]; | |
333 | ||
334 | rc->index = uwb_rc_new_index(); | |
335 | ||
336 | dev = &rc->uwb_dev.dev; | |
337 | dev_set_name(dev, "uwb%d", rc->index); | |
338 | ||
339 | rc->priv = priv; | |
340 | ||
fec1a593 SP |
341 | init_waitqueue_head(&rc->uwbd.wq); |
342 | INIT_LIST_HEAD(&rc->uwbd.event_list); | |
343 | spin_lock_init(&rc->uwbd.event_list_lock); | |
344 | ||
345 | uwbd_start(rc); | |
346 | ||
183b9b59 IPG |
347 | result = rc->start(rc); |
348 | if (result < 0) | |
349 | goto error_rc_start; | |
350 | ||
351 | result = uwb_rc_setup(rc); | |
352 | if (result < 0) { | |
353 | dev_err(dev, "cannot setup UWB radio controller: %d\n", result); | |
354 | goto error_rc_setup; | |
355 | } | |
356 | ||
357 | result = uwb_dev_add(&rc->uwb_dev, parent_dev, rc); | |
358 | if (result < 0 && result != -EADDRNOTAVAIL) | |
359 | goto error_dev_add; | |
360 | ||
361 | result = uwb_rc_sys_add(rc); | |
362 | if (result < 0) { | |
363 | dev_err(parent_dev, "cannot register UWB radio controller " | |
364 | "dev attributes: %d\n", result); | |
365 | goto error_sys_add; | |
366 | } | |
367 | ||
368 | uwb_mac_addr_print(macbuf, sizeof(macbuf), &rc->uwb_dev.mac_addr); | |
369 | uwb_dev_addr_print(devbuf, sizeof(devbuf), &rc->uwb_dev.dev_addr); | |
370 | dev_info(dev, | |
371 | "new uwb radio controller (mac %s dev %s) on %s %s\n", | |
372 | macbuf, devbuf, parent_dev->bus->name, dev_name(parent_dev)); | |
373 | rc->ready = 1; | |
374 | return 0; | |
375 | ||
376 | error_sys_add: | |
377 | uwb_dev_rm(&rc->uwb_dev); | |
378 | error_dev_add: | |
379 | error_rc_setup: | |
380 | rc->stop(rc); | |
183b9b59 | 381 | error_rc_start: |
a9e75a38 | 382 | uwbd_stop(rc); |
183b9b59 IPG |
383 | return result; |
384 | } | |
385 | EXPORT_SYMBOL_GPL(uwb_rc_add); | |
386 | ||
387 | ||
388 | static int uwb_dev_offair_helper(struct device *dev, void *priv) | |
389 | { | |
390 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
391 | ||
392 | return __uwb_dev_offair(uwb_dev, uwb_dev->rc); | |
393 | } | |
394 | ||
395 | /* | |
396 | * Remove a Radio Controller; stop beaconing/scanning, disconnect all children | |
397 | */ | |
398 | void uwb_rc_rm(struct uwb_rc *rc) | |
399 | { | |
400 | rc->ready = 0; | |
401 | ||
402 | uwb_dbg_del_rc(rc); | |
58be81ed | 403 | uwb_rsv_remove_all(rc); |
6fae35f9 | 404 | uwb_radio_shutdown(rc); |
183b9b59 IPG |
405 | |
406 | rc->stop(rc); | |
fec1a593 SP |
407 | |
408 | uwbd_stop(rc); | |
58be81ed | 409 | uwb_rc_neh_destroy(rc); |
183b9b59 IPG |
410 | |
411 | uwb_dev_lock(&rc->uwb_dev); | |
412 | rc->priv = NULL; | |
413 | rc->cmd = NULL; | |
414 | uwb_dev_unlock(&rc->uwb_dev); | |
fec1a593 | 415 | mutex_lock(&rc->uwb_beca.mutex); |
183b9b59 IPG |
416 | uwb_dev_for_each(rc, uwb_dev_offair_helper, NULL); |
417 | __uwb_rc_sys_rm(rc); | |
fec1a593 | 418 | mutex_unlock(&rc->uwb_beca.mutex); |
58be81ed | 419 | uwb_rsv_cleanup(rc); |
fec1a593 | 420 | uwb_beca_release(rc); |
183b9b59 IPG |
421 | uwb_dev_rm(&rc->uwb_dev); |
422 | } | |
423 | EXPORT_SYMBOL_GPL(uwb_rc_rm); | |
424 | ||
9f3b795a | 425 | static int find_rc_try_get(struct device *dev, const void *data) |
183b9b59 | 426 | { |
9f3b795a | 427 | const struct uwb_rc *target_rc = data; |
183b9b59 IPG |
428 | struct uwb_rc *rc = dev_get_drvdata(dev); |
429 | ||
430 | if (rc == NULL) { | |
431 | WARN_ON(1); | |
432 | return 0; | |
433 | } | |
434 | if (rc == target_rc) { | |
435 | if (rc->ready == 0) | |
436 | return 0; | |
437 | else | |
438 | return 1; | |
439 | } | |
440 | return 0; | |
441 | } | |
442 | ||
443 | /** | |
444 | * Given a radio controller descriptor, validate and refcount it | |
445 | * | |
446 | * @returns NULL if the rc does not exist or is quiescing; the ptr to | |
447 | * it otherwise. | |
448 | */ | |
449 | struct uwb_rc *__uwb_rc_try_get(struct uwb_rc *target_rc) | |
450 | { | |
451 | struct device *dev; | |
452 | struct uwb_rc *rc = NULL; | |
453 | ||
454 | dev = class_find_device(&uwb_rc_class, NULL, target_rc, | |
455 | find_rc_try_get); | |
456 | if (dev) { | |
457 | rc = dev_get_drvdata(dev); | |
458 | __uwb_rc_get(rc); | |
d6124b40 | 459 | put_device(dev); |
183b9b59 | 460 | } |
d6124b40 | 461 | |
183b9b59 IPG |
462 | return rc; |
463 | } | |
464 | EXPORT_SYMBOL_GPL(__uwb_rc_try_get); | |
465 | ||
466 | /* | |
467 | * RC get for external refcount acquirers... | |
468 | * | |
469 | * Increments the refcount of the device and it's backend modules | |
470 | */ | |
471 | static inline struct uwb_rc *uwb_rc_get(struct uwb_rc *rc) | |
472 | { | |
473 | if (rc->ready == 0) | |
474 | return NULL; | |
475 | uwb_dev_get(&rc->uwb_dev); | |
476 | return rc; | |
477 | } | |
478 | ||
9f3b795a | 479 | static int find_rc_grandpa(struct device *dev, const void *data) |
183b9b59 | 480 | { |
9f3b795a | 481 | const struct device *grandpa_dev = data; |
183b9b59 IPG |
482 | struct uwb_rc *rc = dev_get_drvdata(dev); |
483 | ||
484 | if (rc->uwb_dev.dev.parent->parent == grandpa_dev) { | |
485 | rc = uwb_rc_get(rc); | |
486 | return 1; | |
487 | } | |
488 | return 0; | |
489 | } | |
490 | ||
491 | /** | |
492 | * Locate and refcount a radio controller given a common grand-parent | |
493 | * | |
494 | * @grandpa_dev Pointer to the 'grandparent' device structure. | |
495 | * @returns NULL If the rc does not exist or is quiescing; the ptr to | |
496 | * it otherwise, properly referenced. | |
497 | * | |
498 | * The Radio Control interface (or the UWB Radio Controller) is always | |
499 | * an interface of a device. The parent is the interface, the | |
500 | * grandparent is the device that encapsulates the interface. | |
501 | * | |
502 | * There is no need to lock around as the "grandpa" would be | |
503 | * refcounted by the target, and to remove the referemes, the | |
504 | * uwb_rc_class->sem would have to be taken--we hold it, ergo we | |
505 | * should be safe. | |
506 | */ | |
507 | struct uwb_rc *uwb_rc_get_by_grandpa(const struct device *grandpa_dev) | |
508 | { | |
509 | struct device *dev; | |
510 | struct uwb_rc *rc = NULL; | |
511 | ||
9f3b795a | 512 | dev = class_find_device(&uwb_rc_class, NULL, grandpa_dev, |
183b9b59 | 513 | find_rc_grandpa); |
d6124b40 | 514 | if (dev) { |
183b9b59 | 515 | rc = dev_get_drvdata(dev); |
d6124b40 JH |
516 | put_device(dev); |
517 | } | |
518 | ||
183b9b59 IPG |
519 | return rc; |
520 | } | |
521 | EXPORT_SYMBOL_GPL(uwb_rc_get_by_grandpa); | |
522 | ||
523 | /** | |
524 | * Find a radio controller by device address | |
525 | * | |
526 | * @returns the pointer to the radio controller, properly referenced | |
527 | */ | |
9f3b795a | 528 | static int find_rc_dev(struct device *dev, const void *data) |
183b9b59 | 529 | { |
9f3b795a | 530 | const struct uwb_dev_addr *addr = data; |
183b9b59 IPG |
531 | struct uwb_rc *rc = dev_get_drvdata(dev); |
532 | ||
533 | if (rc == NULL) { | |
534 | WARN_ON(1); | |
535 | return 0; | |
536 | } | |
537 | if (!uwb_dev_addr_cmp(&rc->uwb_dev.dev_addr, addr)) { | |
538 | rc = uwb_rc_get(rc); | |
539 | return 1; | |
540 | } | |
541 | return 0; | |
542 | } | |
543 | ||
544 | struct uwb_rc *uwb_rc_get_by_dev(const struct uwb_dev_addr *addr) | |
545 | { | |
546 | struct device *dev; | |
547 | struct uwb_rc *rc = NULL; | |
548 | ||
9f3b795a | 549 | dev = class_find_device(&uwb_rc_class, NULL, addr, find_rc_dev); |
d6124b40 | 550 | if (dev) { |
183b9b59 | 551 | rc = dev_get_drvdata(dev); |
d6124b40 JH |
552 | put_device(dev); |
553 | } | |
183b9b59 IPG |
554 | |
555 | return rc; | |
556 | } | |
557 | EXPORT_SYMBOL_GPL(uwb_rc_get_by_dev); | |
558 | ||
559 | /** | |
560 | * Drop a reference on a radio controller | |
561 | * | |
562 | * This is the version that should be done by entities external to the | |
563 | * UWB Radio Control stack (ie: clients of the API). | |
564 | */ | |
565 | void uwb_rc_put(struct uwb_rc *rc) | |
566 | { | |
567 | __uwb_rc_put(rc); | |
568 | } | |
569 | EXPORT_SYMBOL_GPL(uwb_rc_put); |