Commit | Line | Data |
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183b9b59 IPG |
1 | /* |
2 | * Ultra Wide Band | |
3 | * Life cycle of radio controllers | |
4 | * | |
5 | * Copyright (C) 2005-2006 Intel Corporation | |
6 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License version | |
10 | * 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
20 | * 02110-1301, USA. | |
21 | * | |
22 | * | |
23 | * FIXME: docs | |
24 | * | |
25 | * A UWB radio controller is also a UWB device, so it embeds one... | |
26 | * | |
27 | * List of RCs comes from the 'struct class uwb_rc_class'. | |
28 | */ | |
29 | ||
30 | #include <linux/kernel.h> | |
31 | #include <linux/string.h> | |
32 | #include <linux/device.h> | |
33 | #include <linux/err.h> | |
34 | #include <linux/random.h> | |
35 | #include <linux/kdev_t.h> | |
36 | #include <linux/etherdevice.h> | |
37 | #include <linux/usb.h> | |
5a0e3ad6 | 38 | #include <linux/slab.h> |
475c0a6b | 39 | #include <linux/export.h> |
183b9b59 | 40 | |
183b9b59 IPG |
41 | #include "uwb-internal.h" |
42 | ||
9f3b795a | 43 | static int uwb_rc_index_match(struct device *dev, const void *data) |
183b9b59 | 44 | { |
9f3b795a | 45 | const int *index = data; |
183b9b59 IPG |
46 | struct uwb_rc *rc = dev_get_drvdata(dev); |
47 | ||
48 | if (rc->index == *index) | |
49 | return 1; | |
50 | return 0; | |
51 | } | |
52 | ||
53 | static struct uwb_rc *uwb_rc_find_by_index(int index) | |
54 | { | |
55 | struct device *dev; | |
56 | struct uwb_rc *rc = NULL; | |
57 | ||
58 | dev = class_find_device(&uwb_rc_class, NULL, &index, uwb_rc_index_match); | |
59 | if (dev) | |
60 | rc = dev_get_drvdata(dev); | |
61 | return rc; | |
62 | } | |
63 | ||
64 | static int uwb_rc_new_index(void) | |
65 | { | |
66 | int index = 0; | |
67 | ||
68 | for (;;) { | |
69 | if (!uwb_rc_find_by_index(index)) | |
70 | return index; | |
71 | if (++index < 0) | |
72 | index = 0; | |
73 | } | |
74 | } | |
75 | ||
76 | /** | |
77 | * Release the backing device of a uwb_rc that has been dynamically allocated. | |
78 | */ | |
79 | static void uwb_rc_sys_release(struct device *dev) | |
80 | { | |
81 | struct uwb_dev *uwb_dev = container_of(dev, struct uwb_dev, dev); | |
82 | struct uwb_rc *rc = container_of(uwb_dev, struct uwb_rc, uwb_dev); | |
83 | ||
183b9b59 | 84 | uwb_rc_ie_release(rc); |
183b9b59 IPG |
85 | kfree(rc); |
86 | } | |
87 | ||
88 | ||
89 | void uwb_rc_init(struct uwb_rc *rc) | |
90 | { | |
91 | struct uwb_dev *uwb_dev = &rc->uwb_dev; | |
92 | ||
93 | uwb_dev_init(uwb_dev); | |
94 | rc->uwb_dev.dev.class = &uwb_rc_class; | |
95 | rc->uwb_dev.dev.release = uwb_rc_sys_release; | |
96 | uwb_rc_neh_create(rc); | |
97 | rc->beaconing = -1; | |
98 | rc->scan_type = UWB_SCAN_DISABLED; | |
99 | INIT_LIST_HEAD(&rc->notifs_chain.list); | |
100 | mutex_init(&rc->notifs_chain.mutex); | |
fec1a593 SP |
101 | INIT_LIST_HEAD(&rc->uwb_beca.list); |
102 | mutex_init(&rc->uwb_beca.mutex); | |
183b9b59 IPG |
103 | uwb_drp_avail_init(rc); |
104 | uwb_rc_ie_init(rc); | |
105 | uwb_rsv_init(rc); | |
106 | uwb_rc_pal_init(rc); | |
107 | } | |
108 | EXPORT_SYMBOL_GPL(uwb_rc_init); | |
109 | ||
110 | ||
111 | struct uwb_rc *uwb_rc_alloc(void) | |
112 | { | |
113 | struct uwb_rc *rc; | |
114 | rc = kzalloc(sizeof(*rc), GFP_KERNEL); | |
115 | if (rc == NULL) | |
116 | return NULL; | |
117 | uwb_rc_init(rc); | |
118 | return rc; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(uwb_rc_alloc); | |
121 | ||
d08e1ad9 TP |
122 | /* |
123 | * Show the ASIE that is broadcast in the UWB beacon by this uwb_rc device. | |
124 | */ | |
125 | static ssize_t ASIE_show(struct device *dev, | |
126 | struct device_attribute *attr, char *buf) | |
127 | { | |
128 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
129 | struct uwb_rc *rc = uwb_dev->rc; | |
130 | struct uwb_ie_hdr *ie; | |
131 | void *ptr; | |
132 | size_t len; | |
133 | int result = 0; | |
134 | ||
135 | /* init empty buffer. */ | |
136 | result = scnprintf(buf, PAGE_SIZE, "\n"); | |
137 | mutex_lock(&rc->ies_mutex); | |
138 | /* walk IEData looking for an ASIE. */ | |
139 | ptr = rc->ies->IEData; | |
140 | len = le16_to_cpu(rc->ies->wIELength); | |
141 | for (;;) { | |
142 | ie = uwb_ie_next(&ptr, &len); | |
143 | if (!ie) | |
144 | break; | |
145 | if (ie->element_id == UWB_APP_SPEC_IE) { | |
146 | result = uwb_ie_dump_hex(ie, | |
147 | ie->length + sizeof(struct uwb_ie_hdr), | |
148 | buf, PAGE_SIZE); | |
149 | break; | |
150 | } | |
151 | } | |
152 | mutex_unlock(&rc->ies_mutex); | |
153 | ||
154 | return result; | |
155 | } | |
156 | ||
157 | /* | |
158 | * Update the ASIE that is broadcast in the UWB beacon by this uwb_rc device. | |
159 | */ | |
160 | static ssize_t ASIE_store(struct device *dev, | |
161 | struct device_attribute *attr, | |
162 | const char *buf, size_t size) | |
163 | { | |
164 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
165 | struct uwb_rc *rc = uwb_dev->rc; | |
166 | char ie_buf[255]; | |
167 | int result, ie_len = 0; | |
168 | const char *cur_ptr = buf; | |
169 | struct uwb_ie_hdr *ie; | |
170 | ||
171 | /* empty string means clear the ASIE. */ | |
172 | if (strlen(buf) <= 1) { | |
173 | uwb_rc_ie_rm(rc, UWB_APP_SPEC_IE); | |
174 | return size; | |
175 | } | |
176 | ||
177 | /* if non-empty string, convert string of hex chars to binary. */ | |
178 | while (ie_len < sizeof(ie_buf)) { | |
179 | int char_count; | |
180 | ||
181 | if (sscanf(cur_ptr, " %02hhX %n", | |
182 | &(ie_buf[ie_len]), &char_count) > 0) { | |
183 | ++ie_len; | |
184 | /* skip chars read from cur_ptr. */ | |
185 | cur_ptr += char_count; | |
186 | } else { | |
187 | break; | |
188 | } | |
189 | } | |
190 | ||
191 | /* validate IE length and type. */ | |
192 | if (ie_len < sizeof(struct uwb_ie_hdr)) { | |
193 | dev_err(dev, "%s: Invalid ASIE size %d.\n", __func__, ie_len); | |
194 | return -EINVAL; | |
195 | } | |
196 | ||
197 | ie = (struct uwb_ie_hdr *)ie_buf; | |
198 | if (ie->element_id != UWB_APP_SPEC_IE) { | |
199 | dev_err(dev, "%s: Invalid IE element type size = 0x%02X.\n", | |
200 | __func__, ie->element_id); | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | /* bounds check length field from user. */ | |
205 | if (ie->length > (ie_len - sizeof(struct uwb_ie_hdr))) | |
206 | ie->length = ie_len - sizeof(struct uwb_ie_hdr); | |
207 | ||
208 | /* | |
209 | * Valid ASIE received. Remove current ASIE then add the new one using | |
210 | * uwb_rc_ie_add. | |
211 | */ | |
212 | uwb_rc_ie_rm(rc, UWB_APP_SPEC_IE); | |
213 | ||
214 | result = uwb_rc_ie_add(rc, ie, ie->length + sizeof(struct uwb_ie_hdr)); | |
215 | ||
216 | return result >= 0 ? size : result; | |
217 | } | |
218 | static DEVICE_ATTR_RW(ASIE); | |
219 | ||
183b9b59 IPG |
220 | static struct attribute *rc_attrs[] = { |
221 | &dev_attr_mac_address.attr, | |
222 | &dev_attr_scan.attr, | |
223 | &dev_attr_beacon.attr, | |
d08e1ad9 | 224 | &dev_attr_ASIE.attr, |
183b9b59 IPG |
225 | NULL, |
226 | }; | |
227 | ||
228 | static struct attribute_group rc_attr_group = { | |
229 | .attrs = rc_attrs, | |
230 | }; | |
231 | ||
232 | /* | |
233 | * Registration of sysfs specific stuff | |
234 | */ | |
235 | static int uwb_rc_sys_add(struct uwb_rc *rc) | |
236 | { | |
237 | return sysfs_create_group(&rc->uwb_dev.dev.kobj, &rc_attr_group); | |
238 | } | |
239 | ||
240 | ||
241 | static void __uwb_rc_sys_rm(struct uwb_rc *rc) | |
242 | { | |
243 | sysfs_remove_group(&rc->uwb_dev.dev.kobj, &rc_attr_group); | |
244 | } | |
245 | ||
246 | /** | |
247 | * uwb_rc_mac_addr_setup - get an RC's EUI-48 address or set it | |
248 | * @rc: the radio controller. | |
249 | * | |
250 | * If the EUI-48 address is 00:00:00:00:00:00 or FF:FF:FF:FF:FF:FF | |
251 | * then a random locally administered EUI-48 is generated and set on | |
252 | * the device. The probability of address collisions is sufficiently | |
253 | * unlikely (1/2^40 = 9.1e-13) that they're not checked for. | |
254 | */ | |
255 | static | |
256 | int uwb_rc_mac_addr_setup(struct uwb_rc *rc) | |
257 | { | |
258 | int result; | |
259 | struct device *dev = &rc->uwb_dev.dev; | |
260 | struct uwb_dev *uwb_dev = &rc->uwb_dev; | |
261 | char devname[UWB_ADDR_STRSIZE]; | |
262 | struct uwb_mac_addr addr; | |
263 | ||
264 | result = uwb_rc_mac_addr_get(rc, &addr); | |
265 | if (result < 0) { | |
266 | dev_err(dev, "cannot retrieve UWB EUI-48 address: %d\n", result); | |
267 | return result; | |
268 | } | |
269 | ||
270 | if (uwb_mac_addr_unset(&addr) || uwb_mac_addr_bcast(&addr)) { | |
25985edc | 271 | addr.data[0] = 0x02; /* locally administered and unicast */ |
183b9b59 IPG |
272 | get_random_bytes(&addr.data[1], sizeof(addr.data)-1); |
273 | ||
274 | result = uwb_rc_mac_addr_set(rc, &addr); | |
275 | if (result < 0) { | |
276 | uwb_mac_addr_print(devname, sizeof(devname), &addr); | |
277 | dev_err(dev, "cannot set EUI-48 address %s: %d\n", | |
278 | devname, result); | |
279 | return result; | |
280 | } | |
281 | } | |
282 | uwb_dev->mac_addr = addr; | |
283 | return 0; | |
284 | } | |
285 | ||
286 | ||
287 | ||
288 | static int uwb_rc_setup(struct uwb_rc *rc) | |
289 | { | |
290 | int result; | |
291 | struct device *dev = &rc->uwb_dev.dev; | |
292 | ||
6fae35f9 | 293 | result = uwb_radio_setup(rc); |
183b9b59 | 294 | if (result < 0) { |
6fae35f9 | 295 | dev_err(dev, "cannot setup UWB radio: %d\n", result); |
183b9b59 IPG |
296 | goto error; |
297 | } | |
298 | result = uwb_rc_mac_addr_setup(rc); | |
299 | if (result < 0) { | |
300 | dev_err(dev, "cannot setup UWB MAC address: %d\n", result); | |
301 | goto error; | |
302 | } | |
303 | result = uwb_rc_dev_addr_assign(rc); | |
304 | if (result < 0) { | |
305 | dev_err(dev, "cannot assign UWB DevAddr: %d\n", result); | |
306 | goto error; | |
307 | } | |
308 | result = uwb_rc_ie_setup(rc); | |
309 | if (result < 0) { | |
310 | dev_err(dev, "cannot setup IE subsystem: %d\n", result); | |
311 | goto error_ie_setup; | |
312 | } | |
183b9b59 IPG |
313 | result = uwb_rsv_setup(rc); |
314 | if (result < 0) { | |
315 | dev_err(dev, "cannot setup reservation subsystem: %d\n", result); | |
316 | goto error_rsv_setup; | |
317 | } | |
318 | uwb_dbg_add_rc(rc); | |
319 | return 0; | |
320 | ||
321 | error_rsv_setup: | |
322 | uwb_rc_ie_release(rc); | |
323 | error_ie_setup: | |
324 | error: | |
325 | return result; | |
326 | } | |
327 | ||
328 | ||
329 | /** | |
330 | * Register a new UWB radio controller | |
331 | * | |
332 | * Did you call uwb_rc_init() on your rc? | |
333 | * | |
334 | * We assume that this is being called with a > 0 refcount on | |
335 | * it [through ops->{get|put}_device(). We'll take our own, though. | |
336 | * | |
337 | * @parent_dev is our real device, the one that provides the actual UWB device | |
338 | */ | |
339 | int uwb_rc_add(struct uwb_rc *rc, struct device *parent_dev, void *priv) | |
340 | { | |
341 | int result; | |
342 | struct device *dev; | |
343 | char macbuf[UWB_ADDR_STRSIZE], devbuf[UWB_ADDR_STRSIZE]; | |
344 | ||
345 | rc->index = uwb_rc_new_index(); | |
346 | ||
347 | dev = &rc->uwb_dev.dev; | |
348 | dev_set_name(dev, "uwb%d", rc->index); | |
349 | ||
350 | rc->priv = priv; | |
351 | ||
fec1a593 SP |
352 | init_waitqueue_head(&rc->uwbd.wq); |
353 | INIT_LIST_HEAD(&rc->uwbd.event_list); | |
354 | spin_lock_init(&rc->uwbd.event_list_lock); | |
355 | ||
356 | uwbd_start(rc); | |
357 | ||
183b9b59 IPG |
358 | result = rc->start(rc); |
359 | if (result < 0) | |
360 | goto error_rc_start; | |
361 | ||
362 | result = uwb_rc_setup(rc); | |
363 | if (result < 0) { | |
364 | dev_err(dev, "cannot setup UWB radio controller: %d\n", result); | |
365 | goto error_rc_setup; | |
366 | } | |
367 | ||
368 | result = uwb_dev_add(&rc->uwb_dev, parent_dev, rc); | |
369 | if (result < 0 && result != -EADDRNOTAVAIL) | |
370 | goto error_dev_add; | |
371 | ||
372 | result = uwb_rc_sys_add(rc); | |
373 | if (result < 0) { | |
374 | dev_err(parent_dev, "cannot register UWB radio controller " | |
375 | "dev attributes: %d\n", result); | |
376 | goto error_sys_add; | |
377 | } | |
378 | ||
379 | uwb_mac_addr_print(macbuf, sizeof(macbuf), &rc->uwb_dev.mac_addr); | |
380 | uwb_dev_addr_print(devbuf, sizeof(devbuf), &rc->uwb_dev.dev_addr); | |
381 | dev_info(dev, | |
382 | "new uwb radio controller (mac %s dev %s) on %s %s\n", | |
383 | macbuf, devbuf, parent_dev->bus->name, dev_name(parent_dev)); | |
384 | rc->ready = 1; | |
385 | return 0; | |
386 | ||
387 | error_sys_add: | |
388 | uwb_dev_rm(&rc->uwb_dev); | |
389 | error_dev_add: | |
390 | error_rc_setup: | |
391 | rc->stop(rc); | |
183b9b59 | 392 | error_rc_start: |
a9e75a38 | 393 | uwbd_stop(rc); |
183b9b59 IPG |
394 | return result; |
395 | } | |
396 | EXPORT_SYMBOL_GPL(uwb_rc_add); | |
397 | ||
398 | ||
399 | static int uwb_dev_offair_helper(struct device *dev, void *priv) | |
400 | { | |
401 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
402 | ||
403 | return __uwb_dev_offair(uwb_dev, uwb_dev->rc); | |
404 | } | |
405 | ||
406 | /* | |
407 | * Remove a Radio Controller; stop beaconing/scanning, disconnect all children | |
408 | */ | |
409 | void uwb_rc_rm(struct uwb_rc *rc) | |
410 | { | |
411 | rc->ready = 0; | |
412 | ||
413 | uwb_dbg_del_rc(rc); | |
58be81ed | 414 | uwb_rsv_remove_all(rc); |
6fae35f9 | 415 | uwb_radio_shutdown(rc); |
183b9b59 IPG |
416 | |
417 | rc->stop(rc); | |
fec1a593 SP |
418 | |
419 | uwbd_stop(rc); | |
58be81ed | 420 | uwb_rc_neh_destroy(rc); |
183b9b59 IPG |
421 | |
422 | uwb_dev_lock(&rc->uwb_dev); | |
423 | rc->priv = NULL; | |
424 | rc->cmd = NULL; | |
425 | uwb_dev_unlock(&rc->uwb_dev); | |
fec1a593 | 426 | mutex_lock(&rc->uwb_beca.mutex); |
183b9b59 IPG |
427 | uwb_dev_for_each(rc, uwb_dev_offair_helper, NULL); |
428 | __uwb_rc_sys_rm(rc); | |
fec1a593 | 429 | mutex_unlock(&rc->uwb_beca.mutex); |
58be81ed | 430 | uwb_rsv_cleanup(rc); |
fec1a593 | 431 | uwb_beca_release(rc); |
183b9b59 IPG |
432 | uwb_dev_rm(&rc->uwb_dev); |
433 | } | |
434 | EXPORT_SYMBOL_GPL(uwb_rc_rm); | |
435 | ||
9f3b795a | 436 | static int find_rc_try_get(struct device *dev, const void *data) |
183b9b59 | 437 | { |
9f3b795a | 438 | const struct uwb_rc *target_rc = data; |
183b9b59 IPG |
439 | struct uwb_rc *rc = dev_get_drvdata(dev); |
440 | ||
441 | if (rc == NULL) { | |
442 | WARN_ON(1); | |
443 | return 0; | |
444 | } | |
445 | if (rc == target_rc) { | |
446 | if (rc->ready == 0) | |
447 | return 0; | |
448 | else | |
449 | return 1; | |
450 | } | |
451 | return 0; | |
452 | } | |
453 | ||
454 | /** | |
455 | * Given a radio controller descriptor, validate and refcount it | |
456 | * | |
457 | * @returns NULL if the rc does not exist or is quiescing; the ptr to | |
458 | * it otherwise. | |
459 | */ | |
460 | struct uwb_rc *__uwb_rc_try_get(struct uwb_rc *target_rc) | |
461 | { | |
462 | struct device *dev; | |
463 | struct uwb_rc *rc = NULL; | |
464 | ||
465 | dev = class_find_device(&uwb_rc_class, NULL, target_rc, | |
466 | find_rc_try_get); | |
467 | if (dev) { | |
468 | rc = dev_get_drvdata(dev); | |
469 | __uwb_rc_get(rc); | |
470 | } | |
471 | return rc; | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(__uwb_rc_try_get); | |
474 | ||
475 | /* | |
476 | * RC get for external refcount acquirers... | |
477 | * | |
478 | * Increments the refcount of the device and it's backend modules | |
479 | */ | |
480 | static inline struct uwb_rc *uwb_rc_get(struct uwb_rc *rc) | |
481 | { | |
482 | if (rc->ready == 0) | |
483 | return NULL; | |
484 | uwb_dev_get(&rc->uwb_dev); | |
485 | return rc; | |
486 | } | |
487 | ||
9f3b795a | 488 | static int find_rc_grandpa(struct device *dev, const void *data) |
183b9b59 | 489 | { |
9f3b795a | 490 | const struct device *grandpa_dev = data; |
183b9b59 IPG |
491 | struct uwb_rc *rc = dev_get_drvdata(dev); |
492 | ||
493 | if (rc->uwb_dev.dev.parent->parent == grandpa_dev) { | |
494 | rc = uwb_rc_get(rc); | |
495 | return 1; | |
496 | } | |
497 | return 0; | |
498 | } | |
499 | ||
500 | /** | |
501 | * Locate and refcount a radio controller given a common grand-parent | |
502 | * | |
503 | * @grandpa_dev Pointer to the 'grandparent' device structure. | |
504 | * @returns NULL If the rc does not exist or is quiescing; the ptr to | |
505 | * it otherwise, properly referenced. | |
506 | * | |
507 | * The Radio Control interface (or the UWB Radio Controller) is always | |
508 | * an interface of a device. The parent is the interface, the | |
509 | * grandparent is the device that encapsulates the interface. | |
510 | * | |
511 | * There is no need to lock around as the "grandpa" would be | |
512 | * refcounted by the target, and to remove the referemes, the | |
513 | * uwb_rc_class->sem would have to be taken--we hold it, ergo we | |
514 | * should be safe. | |
515 | */ | |
516 | struct uwb_rc *uwb_rc_get_by_grandpa(const struct device *grandpa_dev) | |
517 | { | |
518 | struct device *dev; | |
519 | struct uwb_rc *rc = NULL; | |
520 | ||
9f3b795a | 521 | dev = class_find_device(&uwb_rc_class, NULL, grandpa_dev, |
183b9b59 IPG |
522 | find_rc_grandpa); |
523 | if (dev) | |
524 | rc = dev_get_drvdata(dev); | |
525 | return rc; | |
526 | } | |
527 | EXPORT_SYMBOL_GPL(uwb_rc_get_by_grandpa); | |
528 | ||
529 | /** | |
530 | * Find a radio controller by device address | |
531 | * | |
532 | * @returns the pointer to the radio controller, properly referenced | |
533 | */ | |
9f3b795a | 534 | static int find_rc_dev(struct device *dev, const void *data) |
183b9b59 | 535 | { |
9f3b795a | 536 | const struct uwb_dev_addr *addr = data; |
183b9b59 IPG |
537 | struct uwb_rc *rc = dev_get_drvdata(dev); |
538 | ||
539 | if (rc == NULL) { | |
540 | WARN_ON(1); | |
541 | return 0; | |
542 | } | |
543 | if (!uwb_dev_addr_cmp(&rc->uwb_dev.dev_addr, addr)) { | |
544 | rc = uwb_rc_get(rc); | |
545 | return 1; | |
546 | } | |
547 | return 0; | |
548 | } | |
549 | ||
550 | struct uwb_rc *uwb_rc_get_by_dev(const struct uwb_dev_addr *addr) | |
551 | { | |
552 | struct device *dev; | |
553 | struct uwb_rc *rc = NULL; | |
554 | ||
9f3b795a | 555 | dev = class_find_device(&uwb_rc_class, NULL, addr, find_rc_dev); |
183b9b59 IPG |
556 | if (dev) |
557 | rc = dev_get_drvdata(dev); | |
558 | ||
559 | return rc; | |
560 | } | |
561 | EXPORT_SYMBOL_GPL(uwb_rc_get_by_dev); | |
562 | ||
563 | /** | |
564 | * Drop a reference on a radio controller | |
565 | * | |
566 | * This is the version that should be done by entities external to the | |
567 | * UWB Radio Control stack (ie: clients of the API). | |
568 | */ | |
569 | void uwb_rc_put(struct uwb_rc *rc) | |
570 | { | |
571 | __uwb_rc_put(rc); | |
572 | } | |
573 | EXPORT_SYMBOL_GPL(uwb_rc_put); |