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22d203ec IPG |
1 | /* |
2 | * Ultra Wide Band | |
3 | * Beacon management | |
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 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/kdev_t.h> | |
32 | #include "uwb-internal.h" | |
33 | ||
34 | #define D_LOCAL 0 | |
35 | #include <linux/uwb/debug.h> | |
36 | ||
37 | /** Start Beaconing command structure */ | |
38 | struct uwb_rc_cmd_start_beacon { | |
39 | struct uwb_rccb rccb; | |
40 | __le16 wBPSTOffset; | |
41 | u8 bChannelNumber; | |
42 | } __attribute__((packed)); | |
43 | ||
44 | ||
45 | static int uwb_rc_start_beacon(struct uwb_rc *rc, u16 bpst_offset, u8 channel) | |
46 | { | |
47 | int result; | |
48 | struct uwb_rc_cmd_start_beacon *cmd; | |
49 | struct uwb_rc_evt_confirm reply; | |
50 | ||
51 | cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); | |
52 | if (cmd == NULL) | |
53 | return -ENOMEM; | |
54 | cmd->rccb.bCommandType = UWB_RC_CET_GENERAL; | |
55 | cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_START_BEACON); | |
56 | cmd->wBPSTOffset = cpu_to_le16(bpst_offset); | |
57 | cmd->bChannelNumber = channel; | |
58 | reply.rceb.bEventType = UWB_RC_CET_GENERAL; | |
59 | reply.rceb.wEvent = UWB_RC_CMD_START_BEACON; | |
60 | result = uwb_rc_cmd(rc, "START-BEACON", &cmd->rccb, sizeof(*cmd), | |
61 | &reply.rceb, sizeof(reply)); | |
62 | if (result < 0) | |
63 | goto error_cmd; | |
64 | if (reply.bResultCode != UWB_RC_RES_SUCCESS) { | |
65 | dev_err(&rc->uwb_dev.dev, | |
66 | "START-BEACON: command execution failed: %s (%d)\n", | |
67 | uwb_rc_strerror(reply.bResultCode), reply.bResultCode); | |
68 | result = -EIO; | |
69 | } | |
70 | error_cmd: | |
71 | kfree(cmd); | |
72 | return result; | |
73 | } | |
74 | ||
75 | static int uwb_rc_stop_beacon(struct uwb_rc *rc) | |
76 | { | |
77 | int result; | |
78 | struct uwb_rccb *cmd; | |
79 | struct uwb_rc_evt_confirm reply; | |
80 | ||
81 | cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); | |
82 | if (cmd == NULL) | |
83 | return -ENOMEM; | |
84 | cmd->bCommandType = UWB_RC_CET_GENERAL; | |
85 | cmd->wCommand = cpu_to_le16(UWB_RC_CMD_STOP_BEACON); | |
86 | reply.rceb.bEventType = UWB_RC_CET_GENERAL; | |
87 | reply.rceb.wEvent = UWB_RC_CMD_STOP_BEACON; | |
88 | result = uwb_rc_cmd(rc, "STOP-BEACON", cmd, sizeof(*cmd), | |
89 | &reply.rceb, sizeof(reply)); | |
90 | if (result < 0) | |
91 | goto error_cmd; | |
92 | if (reply.bResultCode != UWB_RC_RES_SUCCESS) { | |
93 | dev_err(&rc->uwb_dev.dev, | |
94 | "STOP-BEACON: command execution failed: %s (%d)\n", | |
95 | uwb_rc_strerror(reply.bResultCode), reply.bResultCode); | |
96 | result = -EIO; | |
97 | } | |
98 | error_cmd: | |
99 | kfree(cmd); | |
100 | return result; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Start/stop beacons | |
105 | * | |
106 | * @rc: UWB Radio Controller to operate on | |
107 | * @channel: UWB channel on which to beacon (WUSB[table | |
108 | * 5-12]). If -1, stop beaconing. | |
109 | * @bpst_offset: Beacon Period Start Time offset; FIXME-do zero | |
110 | * | |
111 | * According to WHCI 0.95 [4.13.6] the driver will only receive the RCEB | |
112 | * of a SET IE command after the device sent the first beacon that includes | |
113 | * the IEs specified in the SET IE command. So, after we start beaconing we | |
114 | * check if there is anything in the IE cache and call the SET IE command | |
115 | * if needed. | |
116 | */ | |
117 | int uwb_rc_beacon(struct uwb_rc *rc, int channel, unsigned bpst_offset) | |
118 | { | |
119 | int result; | |
120 | struct device *dev = &rc->uwb_dev.dev; | |
121 | ||
122 | mutex_lock(&rc->uwb_dev.mutex); | |
123 | if (channel < 0) | |
124 | channel = -1; | |
125 | if (channel == -1) | |
126 | result = uwb_rc_stop_beacon(rc); | |
127 | else { | |
128 | /* channel >= 0...dah */ | |
129 | result = uwb_rc_start_beacon(rc, bpst_offset, channel); | |
130 | if (result < 0) | |
131 | goto out_up; | |
132 | if (le16_to_cpu(rc->ies->wIELength) > 0) { | |
133 | result = uwb_rc_set_ie(rc, rc->ies); | |
134 | if (result < 0) { | |
135 | dev_err(dev, "Cannot set new IE on device: " | |
136 | "%d\n", result); | |
137 | result = uwb_rc_stop_beacon(rc); | |
138 | channel = -1; | |
139 | bpst_offset = 0; | |
140 | } else | |
141 | result = 0; | |
142 | } | |
143 | } | |
144 | ||
145 | if (result < 0) | |
146 | goto out_up; | |
147 | rc->beaconing = channel; | |
148 | ||
149 | uwb_notify(rc, NULL, uwb_bg_joined(rc) ? UWB_NOTIF_BG_JOIN : UWB_NOTIF_BG_LEAVE); | |
150 | ||
151 | out_up: | |
152 | mutex_unlock(&rc->uwb_dev.mutex); | |
153 | return result; | |
154 | } | |
155 | ||
156 | /* | |
157 | * Beacon cache | |
158 | * | |
159 | * The purpose of this is to speed up the lookup of becon information | |
160 | * when a new beacon arrives. The UWB Daemon uses it also to keep a | |
161 | * tab of which devices are in radio distance and which not. When a | |
162 | * device's beacon stays present for more than a certain amount of | |
163 | * time, it is considered a new, usable device. When a beacon ceases | |
164 | * to be received for a certain amount of time, it is considered that | |
165 | * the device is gone. | |
166 | * | |
167 | * FIXME: use an allocator for the entries | |
168 | * FIXME: use something faster for search than a list | |
169 | */ | |
170 | ||
171 | struct uwb_beca uwb_beca = { | |
172 | .list = LIST_HEAD_INIT(uwb_beca.list), | |
173 | .mutex = __MUTEX_INITIALIZER(uwb_beca.mutex) | |
174 | }; | |
175 | ||
176 | ||
177 | void uwb_bce_kfree(struct kref *_bce) | |
178 | { | |
179 | struct uwb_beca_e *bce = container_of(_bce, struct uwb_beca_e, refcnt); | |
180 | ||
181 | kfree(bce->be); | |
182 | kfree(bce); | |
183 | } | |
184 | ||
185 | ||
186 | /* Find a beacon by dev addr in the cache */ | |
187 | static | |
188 | struct uwb_beca_e *__uwb_beca_find_bydev(const struct uwb_dev_addr *dev_addr) | |
189 | { | |
190 | struct uwb_beca_e *bce, *next; | |
191 | list_for_each_entry_safe(bce, next, &uwb_beca.list, node) { | |
192 | d_printf(6, NULL, "looking for addr %02x:%02x in %02x:%02x\n", | |
193 | dev_addr->data[0], dev_addr->data[1], | |
194 | bce->dev_addr.data[0], bce->dev_addr.data[1]); | |
195 | if (!memcmp(&bce->dev_addr, dev_addr, sizeof(bce->dev_addr))) | |
196 | goto out; | |
197 | } | |
198 | bce = NULL; | |
199 | out: | |
200 | return bce; | |
201 | } | |
202 | ||
203 | /* Find a beacon by dev addr in the cache */ | |
204 | static | |
205 | struct uwb_beca_e *__uwb_beca_find_bymac(const struct uwb_mac_addr *mac_addr) | |
206 | { | |
207 | struct uwb_beca_e *bce, *next; | |
208 | list_for_each_entry_safe(bce, next, &uwb_beca.list, node) { | |
209 | if (!memcmp(bce->mac_addr, mac_addr->data, | |
c15895ef | 210 | sizeof(struct uwb_mac_addr))) |
22d203ec IPG |
211 | goto out; |
212 | } | |
213 | bce = NULL; | |
214 | out: | |
215 | return bce; | |
216 | } | |
217 | ||
218 | /** | |
219 | * uwb_dev_get_by_devaddr - get a UWB device with a specific DevAddr | |
220 | * @rc: the radio controller that saw the device | |
221 | * @devaddr: DevAddr of the UWB device to find | |
222 | * | |
223 | * There may be more than one matching device (in the case of a | |
224 | * DevAddr conflict), but only the first one is returned. | |
225 | */ | |
226 | struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc, | |
227 | const struct uwb_dev_addr *devaddr) | |
228 | { | |
229 | struct uwb_dev *found = NULL; | |
230 | struct uwb_beca_e *bce; | |
231 | ||
232 | mutex_lock(&uwb_beca.mutex); | |
233 | bce = __uwb_beca_find_bydev(devaddr); | |
234 | if (bce) | |
235 | found = uwb_dev_try_get(rc, bce->uwb_dev); | |
236 | mutex_unlock(&uwb_beca.mutex); | |
237 | ||
238 | return found; | |
239 | } | |
240 | ||
241 | /** | |
242 | * uwb_dev_get_by_macaddr - get a UWB device with a specific EUI-48 | |
243 | * @rc: the radio controller that saw the device | |
244 | * @devaddr: EUI-48 of the UWB device to find | |
245 | */ | |
246 | struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc, | |
247 | const struct uwb_mac_addr *macaddr) | |
248 | { | |
249 | struct uwb_dev *found = NULL; | |
250 | struct uwb_beca_e *bce; | |
251 | ||
252 | mutex_lock(&uwb_beca.mutex); | |
253 | bce = __uwb_beca_find_bymac(macaddr); | |
254 | if (bce) | |
255 | found = uwb_dev_try_get(rc, bce->uwb_dev); | |
256 | mutex_unlock(&uwb_beca.mutex); | |
257 | ||
258 | return found; | |
259 | } | |
260 | ||
261 | /* Initialize a beacon cache entry */ | |
262 | static void uwb_beca_e_init(struct uwb_beca_e *bce) | |
263 | { | |
264 | mutex_init(&bce->mutex); | |
265 | kref_init(&bce->refcnt); | |
266 | stats_init(&bce->lqe_stats); | |
267 | stats_init(&bce->rssi_stats); | |
268 | } | |
269 | ||
270 | /* | |
271 | * Add a beacon to the cache | |
272 | * | |
273 | * @be: Beacon event information | |
274 | * @bf: Beacon frame (part of b, really) | |
275 | * @ts_jiffies: Timestamp (in jiffies) when the beacon was received | |
276 | */ | |
277 | struct uwb_beca_e *__uwb_beca_add(struct uwb_rc_evt_beacon *be, | |
278 | struct uwb_beacon_frame *bf, | |
279 | unsigned long ts_jiffies) | |
280 | { | |
281 | struct uwb_beca_e *bce; | |
282 | ||
283 | bce = kzalloc(sizeof(*bce), GFP_KERNEL); | |
284 | if (bce == NULL) | |
285 | return NULL; | |
286 | uwb_beca_e_init(bce); | |
287 | bce->ts_jiffies = ts_jiffies; | |
288 | bce->uwb_dev = NULL; | |
289 | list_add(&bce->node, &uwb_beca.list); | |
290 | return bce; | |
291 | } | |
292 | ||
293 | /* | |
294 | * Wipe out beacon entries that became stale | |
295 | * | |
296 | * Remove associated devicest too. | |
297 | */ | |
298 | void uwb_beca_purge(void) | |
299 | { | |
300 | struct uwb_beca_e *bce, *next; | |
45c16cd9 DV |
301 | unsigned long expires; |
302 | ||
22d203ec IPG |
303 | mutex_lock(&uwb_beca.mutex); |
304 | list_for_each_entry_safe(bce, next, &uwb_beca.list, node) { | |
45c16cd9 DV |
305 | expires = bce->ts_jiffies + msecs_to_jiffies(beacon_timeout_ms); |
306 | if (time_after(jiffies, expires)) { | |
22d203ec IPG |
307 | uwbd_dev_offair(bce); |
308 | list_del(&bce->node); | |
309 | uwb_bce_put(bce); | |
310 | } | |
311 | } | |
312 | mutex_unlock(&uwb_beca.mutex); | |
313 | } | |
314 | ||
315 | /* Clean up the whole beacon cache. Called on shutdown */ | |
316 | void uwb_beca_release(void) | |
317 | { | |
318 | struct uwb_beca_e *bce, *next; | |
319 | mutex_lock(&uwb_beca.mutex); | |
320 | list_for_each_entry_safe(bce, next, &uwb_beca.list, node) { | |
321 | list_del(&bce->node); | |
322 | uwb_bce_put(bce); | |
323 | } | |
324 | mutex_unlock(&uwb_beca.mutex); | |
325 | } | |
326 | ||
327 | static void uwb_beacon_print(struct uwb_rc *rc, struct uwb_rc_evt_beacon *be, | |
328 | struct uwb_beacon_frame *bf) | |
329 | { | |
330 | char macbuf[UWB_ADDR_STRSIZE]; | |
331 | char devbuf[UWB_ADDR_STRSIZE]; | |
332 | char dstbuf[UWB_ADDR_STRSIZE]; | |
333 | ||
334 | uwb_mac_addr_print(macbuf, sizeof(macbuf), &bf->Device_Identifier); | |
335 | uwb_dev_addr_print(devbuf, sizeof(devbuf), &bf->hdr.SrcAddr); | |
336 | uwb_dev_addr_print(dstbuf, sizeof(dstbuf), &bf->hdr.DestAddr); | |
337 | dev_info(&rc->uwb_dev.dev, | |
338 | "BEACON from %s to %s (ch%u offset %u slot %u MAC %s)\n", | |
339 | devbuf, dstbuf, be->bChannelNumber, be->wBPSTOffset, | |
340 | bf->Beacon_Slot_Number, macbuf); | |
341 | } | |
342 | ||
343 | /* | |
344 | * @bce: beacon cache entry, referenced | |
345 | */ | |
346 | ssize_t uwb_bce_print_IEs(struct uwb_dev *uwb_dev, struct uwb_beca_e *bce, | |
347 | char *buf, size_t size) | |
348 | { | |
349 | ssize_t result = 0; | |
350 | struct uwb_rc_evt_beacon *be; | |
351 | struct uwb_beacon_frame *bf; | |
1cde7f68 DV |
352 | int ies_len; |
353 | struct uwb_ie_hdr *ies; | |
22d203ec IPG |
354 | |
355 | mutex_lock(&bce->mutex); | |
1cde7f68 | 356 | |
22d203ec | 357 | be = bce->be; |
1cde7f68 DV |
358 | if (be) { |
359 | bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo; | |
360 | ies_len = be->wBeaconInfoLength - sizeof(struct uwb_beacon_frame); | |
361 | ies = (struct uwb_ie_hdr *)bf->IEData; | |
362 | ||
363 | result = uwb_ie_dump_hex(ies, ies_len, buf, size); | |
364 | } | |
365 | ||
22d203ec | 366 | mutex_unlock(&bce->mutex); |
1cde7f68 | 367 | |
22d203ec IPG |
368 | return result; |
369 | } | |
370 | ||
371 | /* | |
372 | * Verify that the beacon event, frame and IEs are ok | |
373 | */ | |
374 | static int uwb_verify_beacon(struct uwb_rc *rc, struct uwb_event *evt, | |
375 | struct uwb_rc_evt_beacon *be) | |
376 | { | |
377 | int result = -EINVAL; | |
378 | struct uwb_beacon_frame *bf; | |
379 | struct device *dev = &rc->uwb_dev.dev; | |
380 | ||
381 | /* Is there enough data to decode a beacon frame? */ | |
382 | if (evt->notif.size < sizeof(*be) + sizeof(*bf)) { | |
383 | dev_err(dev, "BEACON event: Not enough data to decode " | |
384 | "(%zu vs %zu bytes needed)\n", evt->notif.size, | |
385 | sizeof(*be) + sizeof(*bf)); | |
386 | goto error; | |
387 | } | |
388 | /* FIXME: make sure beacon frame IEs are fine and that the whole thing | |
389 | * is consistent */ | |
390 | result = 0; | |
391 | error: | |
392 | return result; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Handle UWB_RC_EVT_BEACON events | |
397 | * | |
398 | * We check the beacon cache to see how the received beacon fares. If | |
399 | * is there already we refresh the timestamp. If not we create a new | |
400 | * entry. | |
401 | * | |
402 | * According to the WHCI and WUSB specs, only one beacon frame is | |
403 | * allowed per notification block, so we don't bother about scanning | |
404 | * for more. | |
405 | */ | |
406 | int uwbd_evt_handle_rc_beacon(struct uwb_event *evt) | |
407 | { | |
408 | int result = -EINVAL; | |
409 | struct uwb_rc *rc; | |
410 | struct uwb_rc_evt_beacon *be; | |
411 | struct uwb_beacon_frame *bf; | |
412 | struct uwb_beca_e *bce; | |
22d203ec IPG |
413 | unsigned long last_ts; |
414 | ||
415 | rc = evt->rc; | |
416 | be = container_of(evt->notif.rceb, struct uwb_rc_evt_beacon, rceb); | |
417 | result = uwb_verify_beacon(rc, evt, be); | |
418 | if (result < 0) | |
419 | return result; | |
420 | ||
8092d7c9 | 421 | /* FIXME: handle alien beacons. */ |
22d203ec IPG |
422 | if (be->bBeaconType == UWB_RC_BEACON_TYPE_OL_ALIEN || |
423 | be->bBeaconType == UWB_RC_BEACON_TYPE_NOL_ALIEN) { | |
8092d7c9 | 424 | return -ENOSYS; |
22d203ec | 425 | } |
8092d7c9 | 426 | |
22d203ec IPG |
427 | bf = (struct uwb_beacon_frame *) be->BeaconInfo; |
428 | ||
429 | /* | |
430 | * Drop beacons from devices with a NULL EUI-48 -- they cannot | |
431 | * be uniquely identified. | |
432 | * | |
433 | * It's expected that these will all be WUSB devices and they | |
434 | * have a WUSB specific connection method so ignoring them | |
435 | * here shouldn't be a problem. | |
436 | */ | |
437 | if (uwb_mac_addr_bcast(&bf->Device_Identifier)) | |
438 | return 0; | |
439 | ||
440 | mutex_lock(&uwb_beca.mutex); | |
441 | bce = __uwb_beca_find_bymac(&bf->Device_Identifier); | |
442 | if (bce == NULL) { | |
443 | /* Not in there, a new device is pinging */ | |
444 | uwb_beacon_print(evt->rc, be, bf); | |
445 | bce = __uwb_beca_add(be, bf, evt->ts_jiffies); | |
446 | if (bce == NULL) { | |
447 | mutex_unlock(&uwb_beca.mutex); | |
448 | return -ENOMEM; | |
449 | } | |
450 | } | |
451 | mutex_unlock(&uwb_beca.mutex); | |
452 | ||
453 | mutex_lock(&bce->mutex); | |
454 | /* purge old beacon data */ | |
455 | kfree(bce->be); | |
456 | ||
457 | last_ts = bce->ts_jiffies; | |
458 | ||
459 | /* Update commonly used fields */ | |
460 | bce->ts_jiffies = evt->ts_jiffies; | |
461 | bce->be = be; | |
462 | bce->dev_addr = bf->hdr.SrcAddr; | |
463 | bce->mac_addr = &bf->Device_Identifier; | |
464 | be->wBPSTOffset = le16_to_cpu(be->wBPSTOffset); | |
465 | be->wBeaconInfoLength = le16_to_cpu(be->wBeaconInfoLength); | |
466 | stats_add_sample(&bce->lqe_stats, be->bLQI - 7); | |
467 | stats_add_sample(&bce->rssi_stats, be->bRSSI + 18); | |
468 | ||
469 | /* | |
470 | * This might be a beacon from a new device. | |
471 | */ | |
472 | if (bce->uwb_dev == NULL) | |
473 | uwbd_dev_onair(evt->rc, bce); | |
474 | ||
475 | mutex_unlock(&bce->mutex); | |
476 | ||
477 | return 1; /* we keep the event data */ | |
478 | } | |
479 | ||
480 | /* | |
481 | * Handle UWB_RC_EVT_BEACON_SIZE events | |
482 | * | |
483 | * XXXXX | |
484 | */ | |
485 | int uwbd_evt_handle_rc_beacon_size(struct uwb_event *evt) | |
486 | { | |
487 | int result = -EINVAL; | |
488 | struct device *dev = &evt->rc->uwb_dev.dev; | |
489 | struct uwb_rc_evt_beacon_size *bs; | |
490 | ||
491 | /* Is there enough data to decode the event? */ | |
492 | if (evt->notif.size < sizeof(*bs)) { | |
493 | dev_err(dev, "BEACON SIZE notification: Not enough data to " | |
494 | "decode (%zu vs %zu bytes needed)\n", | |
495 | evt->notif.size, sizeof(*bs)); | |
496 | goto error; | |
497 | } | |
498 | bs = container_of(evt->notif.rceb, struct uwb_rc_evt_beacon_size, rceb); | |
499 | if (0) | |
500 | dev_info(dev, "Beacon size changed to %u bytes " | |
501 | "(FIXME: action?)\n", le16_to_cpu(bs->wNewBeaconSize)); | |
502 | else { | |
503 | /* temporary hack until we do something with this message... */ | |
504 | static unsigned count; | |
505 | if (++count % 1000 == 0) | |
506 | dev_info(dev, "Beacon size changed %u times " | |
507 | "(FIXME: action?)\n", count); | |
508 | } | |
509 | result = 0; | |
510 | error: | |
511 | return result; | |
512 | } | |
513 | ||
514 | /** | |
515 | * uwbd_evt_handle_rc_bp_slot_change - handle a BP_SLOT_CHANGE event | |
516 | * @evt: the BP_SLOT_CHANGE notification from the radio controller | |
517 | * | |
518 | * If the event indicates that no beacon period slots were available | |
519 | * then radio controller has transitioned to a non-beaconing state. | |
520 | * Otherwise, simply save the current beacon slot. | |
521 | */ | |
522 | int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *evt) | |
523 | { | |
524 | struct uwb_rc *rc = evt->rc; | |
525 | struct device *dev = &rc->uwb_dev.dev; | |
526 | struct uwb_rc_evt_bp_slot_change *bpsc; | |
527 | ||
528 | if (evt->notif.size < sizeof(*bpsc)) { | |
529 | dev_err(dev, "BP SLOT CHANGE event: Not enough data\n"); | |
530 | return -EINVAL; | |
531 | } | |
532 | bpsc = container_of(evt->notif.rceb, struct uwb_rc_evt_bp_slot_change, rceb); | |
533 | ||
534 | mutex_lock(&rc->uwb_dev.mutex); | |
535 | if (uwb_rc_evt_bp_slot_change_no_slot(bpsc)) { | |
536 | dev_info(dev, "stopped beaconing: No free slots in BP\n"); | |
537 | rc->beaconing = -1; | |
538 | } else | |
539 | rc->uwb_dev.beacon_slot = uwb_rc_evt_bp_slot_change_slot_num(bpsc); | |
540 | mutex_unlock(&rc->uwb_dev.mutex); | |
541 | ||
542 | return 0; | |
543 | } | |
544 | ||
545 | /** | |
546 | * Handle UWB_RC_EVT_BPOIE_CHANGE events | |
547 | * | |
548 | * XXXXX | |
549 | */ | |
550 | struct uwb_ie_bpo { | |
551 | struct uwb_ie_hdr hdr; | |
552 | u8 bp_length; | |
553 | u8 data[]; | |
554 | } __attribute__((packed)); | |
555 | ||
556 | int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *evt) | |
557 | { | |
558 | int result = -EINVAL; | |
559 | struct device *dev = &evt->rc->uwb_dev.dev; | |
560 | struct uwb_rc_evt_bpoie_change *bpoiec; | |
561 | struct uwb_ie_bpo *bpoie; | |
562 | static unsigned count; /* FIXME: this is a temp hack */ | |
563 | size_t iesize; | |
564 | ||
565 | /* Is there enough data to decode it? */ | |
566 | if (evt->notif.size < sizeof(*bpoiec)) { | |
567 | dev_err(dev, "BPOIEC notification: Not enough data to " | |
568 | "decode (%zu vs %zu bytes needed)\n", | |
569 | evt->notif.size, sizeof(*bpoiec)); | |
570 | goto error; | |
571 | } | |
572 | bpoiec = container_of(evt->notif.rceb, struct uwb_rc_evt_bpoie_change, rceb); | |
573 | iesize = le16_to_cpu(bpoiec->wBPOIELength); | |
574 | if (iesize < sizeof(*bpoie)) { | |
575 | dev_err(dev, "BPOIEC notification: Not enough IE data to " | |
576 | "decode (%zu vs %zu bytes needed)\n", | |
577 | iesize, sizeof(*bpoie)); | |
578 | goto error; | |
579 | } | |
580 | if (++count % 1000 == 0) /* Lame placeholder */ | |
581 | dev_info(dev, "BPOIE: %u changes received\n", count); | |
582 | /* | |
583 | * FIXME: At this point we should go over all the IEs in the | |
584 | * bpoiec->BPOIE array and act on each. | |
585 | */ | |
586 | result = 0; | |
587 | error: | |
588 | return result; | |
589 | } | |
590 | ||
591 | /** | |
592 | * uwb_bg_joined - is the RC in a beacon group? | |
593 | * @rc: the radio controller | |
594 | * | |
595 | * Returns true if the radio controller is in a beacon group (even if | |
596 | * it's the sole member). | |
597 | */ | |
598 | int uwb_bg_joined(struct uwb_rc *rc) | |
599 | { | |
600 | return rc->beaconing != -1; | |
601 | } | |
602 | EXPORT_SYMBOL_GPL(uwb_bg_joined); | |
603 | ||
604 | /* | |
605 | * Print beaconing state. | |
606 | */ | |
607 | static ssize_t uwb_rc_beacon_show(struct device *dev, | |
608 | struct device_attribute *attr, char *buf) | |
609 | { | |
610 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
611 | struct uwb_rc *rc = uwb_dev->rc; | |
612 | ssize_t result; | |
613 | ||
614 | mutex_lock(&rc->uwb_dev.mutex); | |
615 | result = sprintf(buf, "%d\n", rc->beaconing); | |
616 | mutex_unlock(&rc->uwb_dev.mutex); | |
617 | return result; | |
618 | } | |
619 | ||
620 | /* | |
621 | * Start beaconing on the specified channel, or stop beaconing. | |
622 | * | |
623 | * The BPST offset of when to start searching for a beacon group to | |
624 | * join may be specified. | |
625 | */ | |
626 | static ssize_t uwb_rc_beacon_store(struct device *dev, | |
627 | struct device_attribute *attr, | |
628 | const char *buf, size_t size) | |
629 | { | |
630 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
631 | struct uwb_rc *rc = uwb_dev->rc; | |
632 | int channel; | |
633 | unsigned bpst_offset = 0; | |
634 | ssize_t result = -EINVAL; | |
635 | ||
636 | result = sscanf(buf, "%d %u\n", &channel, &bpst_offset); | |
637 | if (result >= 1) | |
638 | result = uwb_rc_beacon(rc, channel, bpst_offset); | |
639 | ||
640 | return result < 0 ? result : size; | |
641 | } | |
642 | DEVICE_ATTR(beacon, S_IRUGO | S_IWUSR, uwb_rc_beacon_show, uwb_rc_beacon_store); |