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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 | */ | |
22d203ec IPG |
25 | #include <linux/kernel.h> |
26 | #include <linux/init.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/device.h> | |
29 | #include <linux/err.h> | |
30 | #include <linux/kdev_t.h> | |
22d203ec | 31 | |
bce83697 | 32 | #include "uwb-internal.h" |
22d203ec | 33 | |
bce83697 | 34 | /* Start Beaconing command structure */ |
22d203ec IPG |
35 | struct uwb_rc_cmd_start_beacon { |
36 | struct uwb_rccb rccb; | |
37 | __le16 wBPSTOffset; | |
38 | u8 bChannelNumber; | |
39 | } __attribute__((packed)); | |
40 | ||
41 | ||
42 | static int uwb_rc_start_beacon(struct uwb_rc *rc, u16 bpst_offset, u8 channel) | |
43 | { | |
44 | int result; | |
45 | struct uwb_rc_cmd_start_beacon *cmd; | |
46 | struct uwb_rc_evt_confirm reply; | |
47 | ||
48 | cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); | |
49 | if (cmd == NULL) | |
50 | return -ENOMEM; | |
51 | cmd->rccb.bCommandType = UWB_RC_CET_GENERAL; | |
52 | cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_START_BEACON); | |
53 | cmd->wBPSTOffset = cpu_to_le16(bpst_offset); | |
54 | cmd->bChannelNumber = channel; | |
55 | reply.rceb.bEventType = UWB_RC_CET_GENERAL; | |
56 | reply.rceb.wEvent = UWB_RC_CMD_START_BEACON; | |
57 | result = uwb_rc_cmd(rc, "START-BEACON", &cmd->rccb, sizeof(*cmd), | |
58 | &reply.rceb, sizeof(reply)); | |
59 | if (result < 0) | |
60 | goto error_cmd; | |
61 | if (reply.bResultCode != UWB_RC_RES_SUCCESS) { | |
62 | dev_err(&rc->uwb_dev.dev, | |
63 | "START-BEACON: command execution failed: %s (%d)\n", | |
64 | uwb_rc_strerror(reply.bResultCode), reply.bResultCode); | |
65 | result = -EIO; | |
66 | } | |
67 | error_cmd: | |
68 | kfree(cmd); | |
69 | return result; | |
70 | } | |
71 | ||
72 | static int uwb_rc_stop_beacon(struct uwb_rc *rc) | |
73 | { | |
74 | int result; | |
75 | struct uwb_rccb *cmd; | |
76 | struct uwb_rc_evt_confirm reply; | |
77 | ||
78 | cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); | |
79 | if (cmd == NULL) | |
80 | return -ENOMEM; | |
81 | cmd->bCommandType = UWB_RC_CET_GENERAL; | |
82 | cmd->wCommand = cpu_to_le16(UWB_RC_CMD_STOP_BEACON); | |
83 | reply.rceb.bEventType = UWB_RC_CET_GENERAL; | |
84 | reply.rceb.wEvent = UWB_RC_CMD_STOP_BEACON; | |
85 | result = uwb_rc_cmd(rc, "STOP-BEACON", cmd, sizeof(*cmd), | |
86 | &reply.rceb, sizeof(reply)); | |
87 | if (result < 0) | |
88 | goto error_cmd; | |
89 | if (reply.bResultCode != UWB_RC_RES_SUCCESS) { | |
90 | dev_err(&rc->uwb_dev.dev, | |
91 | "STOP-BEACON: command execution failed: %s (%d)\n", | |
92 | uwb_rc_strerror(reply.bResultCode), reply.bResultCode); | |
93 | result = -EIO; | |
94 | } | |
95 | error_cmd: | |
96 | kfree(cmd); | |
97 | return result; | |
98 | } | |
99 | ||
100 | /* | |
101 | * Start/stop beacons | |
102 | * | |
103 | * @rc: UWB Radio Controller to operate on | |
104 | * @channel: UWB channel on which to beacon (WUSB[table | |
105 | * 5-12]). If -1, stop beaconing. | |
106 | * @bpst_offset: Beacon Period Start Time offset; FIXME-do zero | |
107 | * | |
108 | * According to WHCI 0.95 [4.13.6] the driver will only receive the RCEB | |
109 | * of a SET IE command after the device sent the first beacon that includes | |
110 | * the IEs specified in the SET IE command. So, after we start beaconing we | |
111 | * check if there is anything in the IE cache and call the SET IE command | |
112 | * if needed. | |
113 | */ | |
114 | int uwb_rc_beacon(struct uwb_rc *rc, int channel, unsigned bpst_offset) | |
115 | { | |
116 | int result; | |
117 | struct device *dev = &rc->uwb_dev.dev; | |
118 | ||
22d203ec IPG |
119 | if (channel < 0) |
120 | channel = -1; | |
121 | if (channel == -1) | |
122 | result = uwb_rc_stop_beacon(rc); | |
123 | else { | |
124 | /* channel >= 0...dah */ | |
125 | result = uwb_rc_start_beacon(rc, bpst_offset, channel); | |
126 | if (result < 0) | |
6fae35f9 | 127 | return result; |
22d203ec IPG |
128 | if (le16_to_cpu(rc->ies->wIELength) > 0) { |
129 | result = uwb_rc_set_ie(rc, rc->ies); | |
130 | if (result < 0) { | |
131 | dev_err(dev, "Cannot set new IE on device: " | |
132 | "%d\n", result); | |
133 | result = uwb_rc_stop_beacon(rc); | |
134 | channel = -1; | |
135 | bpst_offset = 0; | |
6fae35f9 | 136 | } |
22d203ec IPG |
137 | } |
138 | } | |
139 | ||
0996e638 | 140 | if (result >= 0) |
6fae35f9 | 141 | rc->beaconing = channel; |
22d203ec IPG |
142 | return result; |
143 | } | |
144 | ||
145 | /* | |
146 | * Beacon cache | |
147 | * | |
148 | * The purpose of this is to speed up the lookup of becon information | |
149 | * when a new beacon arrives. The UWB Daemon uses it also to keep a | |
150 | * tab of which devices are in radio distance and which not. When a | |
151 | * device's beacon stays present for more than a certain amount of | |
152 | * time, it is considered a new, usable device. When a beacon ceases | |
153 | * to be received for a certain amount of time, it is considered that | |
154 | * the device is gone. | |
155 | * | |
156 | * FIXME: use an allocator for the entries | |
157 | * FIXME: use something faster for search than a list | |
158 | */ | |
159 | ||
22d203ec IPG |
160 | void uwb_bce_kfree(struct kref *_bce) |
161 | { | |
162 | struct uwb_beca_e *bce = container_of(_bce, struct uwb_beca_e, refcnt); | |
163 | ||
164 | kfree(bce->be); | |
165 | kfree(bce); | |
166 | } | |
167 | ||
168 | ||
169 | /* Find a beacon by dev addr in the cache */ | |
170 | static | |
fec1a593 SP |
171 | struct uwb_beca_e *__uwb_beca_find_bydev(struct uwb_rc *rc, |
172 | const struct uwb_dev_addr *dev_addr) | |
22d203ec IPG |
173 | { |
174 | struct uwb_beca_e *bce, *next; | |
fec1a593 | 175 | list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) { |
22d203ec IPG |
176 | if (!memcmp(&bce->dev_addr, dev_addr, sizeof(bce->dev_addr))) |
177 | goto out; | |
178 | } | |
179 | bce = NULL; | |
180 | out: | |
181 | return bce; | |
182 | } | |
183 | ||
184 | /* Find a beacon by dev addr in the cache */ | |
185 | static | |
fec1a593 SP |
186 | struct uwb_beca_e *__uwb_beca_find_bymac(struct uwb_rc *rc, |
187 | const struct uwb_mac_addr *mac_addr) | |
22d203ec IPG |
188 | { |
189 | struct uwb_beca_e *bce, *next; | |
fec1a593 | 190 | list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) { |
22d203ec | 191 | if (!memcmp(bce->mac_addr, mac_addr->data, |
c15895ef | 192 | sizeof(struct uwb_mac_addr))) |
22d203ec IPG |
193 | goto out; |
194 | } | |
195 | bce = NULL; | |
196 | out: | |
197 | return bce; | |
198 | } | |
199 | ||
200 | /** | |
201 | * uwb_dev_get_by_devaddr - get a UWB device with a specific DevAddr | |
202 | * @rc: the radio controller that saw the device | |
203 | * @devaddr: DevAddr of the UWB device to find | |
204 | * | |
205 | * There may be more than one matching device (in the case of a | |
206 | * DevAddr conflict), but only the first one is returned. | |
207 | */ | |
208 | struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc, | |
209 | const struct uwb_dev_addr *devaddr) | |
210 | { | |
211 | struct uwb_dev *found = NULL; | |
212 | struct uwb_beca_e *bce; | |
213 | ||
fec1a593 SP |
214 | mutex_lock(&rc->uwb_beca.mutex); |
215 | bce = __uwb_beca_find_bydev(rc, devaddr); | |
22d203ec IPG |
216 | if (bce) |
217 | found = uwb_dev_try_get(rc, bce->uwb_dev); | |
fec1a593 | 218 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
219 | |
220 | return found; | |
221 | } | |
222 | ||
223 | /** | |
224 | * uwb_dev_get_by_macaddr - get a UWB device with a specific EUI-48 | |
225 | * @rc: the radio controller that saw the device | |
226 | * @devaddr: EUI-48 of the UWB device to find | |
227 | */ | |
228 | struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc, | |
229 | const struct uwb_mac_addr *macaddr) | |
230 | { | |
231 | struct uwb_dev *found = NULL; | |
232 | struct uwb_beca_e *bce; | |
233 | ||
fec1a593 SP |
234 | mutex_lock(&rc->uwb_beca.mutex); |
235 | bce = __uwb_beca_find_bymac(rc, macaddr); | |
22d203ec IPG |
236 | if (bce) |
237 | found = uwb_dev_try_get(rc, bce->uwb_dev); | |
fec1a593 | 238 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
239 | |
240 | return found; | |
241 | } | |
242 | ||
243 | /* Initialize a beacon cache entry */ | |
244 | static void uwb_beca_e_init(struct uwb_beca_e *bce) | |
245 | { | |
246 | mutex_init(&bce->mutex); | |
247 | kref_init(&bce->refcnt); | |
248 | stats_init(&bce->lqe_stats); | |
249 | stats_init(&bce->rssi_stats); | |
250 | } | |
251 | ||
252 | /* | |
253 | * Add a beacon to the cache | |
254 | * | |
255 | * @be: Beacon event information | |
256 | * @bf: Beacon frame (part of b, really) | |
257 | * @ts_jiffies: Timestamp (in jiffies) when the beacon was received | |
258 | */ | |
fec1a593 SP |
259 | static |
260 | struct uwb_beca_e *__uwb_beca_add(struct uwb_rc *rc, | |
261 | struct uwb_rc_evt_beacon *be, | |
22d203ec IPG |
262 | struct uwb_beacon_frame *bf, |
263 | unsigned long ts_jiffies) | |
264 | { | |
265 | struct uwb_beca_e *bce; | |
266 | ||
267 | bce = kzalloc(sizeof(*bce), GFP_KERNEL); | |
268 | if (bce == NULL) | |
269 | return NULL; | |
270 | uwb_beca_e_init(bce); | |
271 | bce->ts_jiffies = ts_jiffies; | |
272 | bce->uwb_dev = NULL; | |
fec1a593 | 273 | list_add(&bce->node, &rc->uwb_beca.list); |
22d203ec IPG |
274 | return bce; |
275 | } | |
276 | ||
277 | /* | |
278 | * Wipe out beacon entries that became stale | |
279 | * | |
280 | * Remove associated devicest too. | |
281 | */ | |
fec1a593 | 282 | void uwb_beca_purge(struct uwb_rc *rc) |
22d203ec IPG |
283 | { |
284 | struct uwb_beca_e *bce, *next; | |
45c16cd9 DV |
285 | unsigned long expires; |
286 | ||
fec1a593 SP |
287 | mutex_lock(&rc->uwb_beca.mutex); |
288 | list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) { | |
45c16cd9 DV |
289 | expires = bce->ts_jiffies + msecs_to_jiffies(beacon_timeout_ms); |
290 | if (time_after(jiffies, expires)) { | |
22d203ec | 291 | uwbd_dev_offair(bce); |
22d203ec IPG |
292 | } |
293 | } | |
fec1a593 | 294 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
295 | } |
296 | ||
297 | /* Clean up the whole beacon cache. Called on shutdown */ | |
fec1a593 | 298 | void uwb_beca_release(struct uwb_rc *rc) |
22d203ec IPG |
299 | { |
300 | struct uwb_beca_e *bce, *next; | |
fec1a593 SP |
301 | |
302 | mutex_lock(&rc->uwb_beca.mutex); | |
303 | list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) { | |
22d203ec IPG |
304 | list_del(&bce->node); |
305 | uwb_bce_put(bce); | |
306 | } | |
fec1a593 | 307 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
308 | } |
309 | ||
310 | static void uwb_beacon_print(struct uwb_rc *rc, struct uwb_rc_evt_beacon *be, | |
311 | struct uwb_beacon_frame *bf) | |
312 | { | |
313 | char macbuf[UWB_ADDR_STRSIZE]; | |
314 | char devbuf[UWB_ADDR_STRSIZE]; | |
315 | char dstbuf[UWB_ADDR_STRSIZE]; | |
316 | ||
317 | uwb_mac_addr_print(macbuf, sizeof(macbuf), &bf->Device_Identifier); | |
318 | uwb_dev_addr_print(devbuf, sizeof(devbuf), &bf->hdr.SrcAddr); | |
319 | uwb_dev_addr_print(dstbuf, sizeof(dstbuf), &bf->hdr.DestAddr); | |
320 | dev_info(&rc->uwb_dev.dev, | |
321 | "BEACON from %s to %s (ch%u offset %u slot %u MAC %s)\n", | |
322 | devbuf, dstbuf, be->bChannelNumber, be->wBPSTOffset, | |
323 | bf->Beacon_Slot_Number, macbuf); | |
324 | } | |
325 | ||
326 | /* | |
327 | * @bce: beacon cache entry, referenced | |
328 | */ | |
329 | ssize_t uwb_bce_print_IEs(struct uwb_dev *uwb_dev, struct uwb_beca_e *bce, | |
330 | char *buf, size_t size) | |
331 | { | |
332 | ssize_t result = 0; | |
333 | struct uwb_rc_evt_beacon *be; | |
334 | struct uwb_beacon_frame *bf; | |
1cde7f68 DV |
335 | int ies_len; |
336 | struct uwb_ie_hdr *ies; | |
22d203ec IPG |
337 | |
338 | mutex_lock(&bce->mutex); | |
1cde7f68 | 339 | |
22d203ec | 340 | be = bce->be; |
1cde7f68 DV |
341 | if (be) { |
342 | bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo; | |
343 | ies_len = be->wBeaconInfoLength - sizeof(struct uwb_beacon_frame); | |
344 | ies = (struct uwb_ie_hdr *)bf->IEData; | |
345 | ||
346 | result = uwb_ie_dump_hex(ies, ies_len, buf, size); | |
347 | } | |
348 | ||
22d203ec | 349 | mutex_unlock(&bce->mutex); |
1cde7f68 | 350 | |
22d203ec IPG |
351 | return result; |
352 | } | |
353 | ||
354 | /* | |
355 | * Verify that the beacon event, frame and IEs are ok | |
356 | */ | |
357 | static int uwb_verify_beacon(struct uwb_rc *rc, struct uwb_event *evt, | |
358 | struct uwb_rc_evt_beacon *be) | |
359 | { | |
360 | int result = -EINVAL; | |
361 | struct uwb_beacon_frame *bf; | |
362 | struct device *dev = &rc->uwb_dev.dev; | |
363 | ||
364 | /* Is there enough data to decode a beacon frame? */ | |
365 | if (evt->notif.size < sizeof(*be) + sizeof(*bf)) { | |
366 | dev_err(dev, "BEACON event: Not enough data to decode " | |
367 | "(%zu vs %zu bytes needed)\n", evt->notif.size, | |
368 | sizeof(*be) + sizeof(*bf)); | |
369 | goto error; | |
370 | } | |
371 | /* FIXME: make sure beacon frame IEs are fine and that the whole thing | |
372 | * is consistent */ | |
373 | result = 0; | |
374 | error: | |
375 | return result; | |
376 | } | |
377 | ||
378 | /* | |
379 | * Handle UWB_RC_EVT_BEACON events | |
380 | * | |
381 | * We check the beacon cache to see how the received beacon fares. If | |
382 | * is there already we refresh the timestamp. If not we create a new | |
383 | * entry. | |
384 | * | |
385 | * According to the WHCI and WUSB specs, only one beacon frame is | |
386 | * allowed per notification block, so we don't bother about scanning | |
387 | * for more. | |
388 | */ | |
389 | int uwbd_evt_handle_rc_beacon(struct uwb_event *evt) | |
390 | { | |
391 | int result = -EINVAL; | |
392 | struct uwb_rc *rc; | |
393 | struct uwb_rc_evt_beacon *be; | |
394 | struct uwb_beacon_frame *bf; | |
395 | struct uwb_beca_e *bce; | |
22d203ec IPG |
396 | unsigned long last_ts; |
397 | ||
398 | rc = evt->rc; | |
399 | be = container_of(evt->notif.rceb, struct uwb_rc_evt_beacon, rceb); | |
400 | result = uwb_verify_beacon(rc, evt, be); | |
401 | if (result < 0) | |
402 | return result; | |
403 | ||
8092d7c9 | 404 | /* FIXME: handle alien beacons. */ |
22d203ec IPG |
405 | if (be->bBeaconType == UWB_RC_BEACON_TYPE_OL_ALIEN || |
406 | be->bBeaconType == UWB_RC_BEACON_TYPE_NOL_ALIEN) { | |
8092d7c9 | 407 | return -ENOSYS; |
22d203ec | 408 | } |
8092d7c9 | 409 | |
22d203ec IPG |
410 | bf = (struct uwb_beacon_frame *) be->BeaconInfo; |
411 | ||
412 | /* | |
413 | * Drop beacons from devices with a NULL EUI-48 -- they cannot | |
414 | * be uniquely identified. | |
415 | * | |
416 | * It's expected that these will all be WUSB devices and they | |
417 | * have a WUSB specific connection method so ignoring them | |
418 | * here shouldn't be a problem. | |
419 | */ | |
420 | if (uwb_mac_addr_bcast(&bf->Device_Identifier)) | |
421 | return 0; | |
422 | ||
fec1a593 SP |
423 | mutex_lock(&rc->uwb_beca.mutex); |
424 | bce = __uwb_beca_find_bymac(rc, &bf->Device_Identifier); | |
22d203ec IPG |
425 | if (bce == NULL) { |
426 | /* Not in there, a new device is pinging */ | |
427 | uwb_beacon_print(evt->rc, be, bf); | |
fec1a593 | 428 | bce = __uwb_beca_add(rc, be, bf, evt->ts_jiffies); |
22d203ec | 429 | if (bce == NULL) { |
fec1a593 | 430 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
431 | return -ENOMEM; |
432 | } | |
433 | } | |
fec1a593 | 434 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
435 | |
436 | mutex_lock(&bce->mutex); | |
437 | /* purge old beacon data */ | |
438 | kfree(bce->be); | |
439 | ||
440 | last_ts = bce->ts_jiffies; | |
441 | ||
442 | /* Update commonly used fields */ | |
443 | bce->ts_jiffies = evt->ts_jiffies; | |
444 | bce->be = be; | |
445 | bce->dev_addr = bf->hdr.SrcAddr; | |
446 | bce->mac_addr = &bf->Device_Identifier; | |
447 | be->wBPSTOffset = le16_to_cpu(be->wBPSTOffset); | |
448 | be->wBeaconInfoLength = le16_to_cpu(be->wBeaconInfoLength); | |
449 | stats_add_sample(&bce->lqe_stats, be->bLQI - 7); | |
450 | stats_add_sample(&bce->rssi_stats, be->bRSSI + 18); | |
451 | ||
452 | /* | |
453 | * This might be a beacon from a new device. | |
454 | */ | |
455 | if (bce->uwb_dev == NULL) | |
456 | uwbd_dev_onair(evt->rc, bce); | |
457 | ||
458 | mutex_unlock(&bce->mutex); | |
459 | ||
460 | return 1; /* we keep the event data */ | |
461 | } | |
462 | ||
463 | /* | |
464 | * Handle UWB_RC_EVT_BEACON_SIZE events | |
465 | * | |
466 | * XXXXX | |
467 | */ | |
468 | int uwbd_evt_handle_rc_beacon_size(struct uwb_event *evt) | |
469 | { | |
470 | int result = -EINVAL; | |
471 | struct device *dev = &evt->rc->uwb_dev.dev; | |
472 | struct uwb_rc_evt_beacon_size *bs; | |
473 | ||
474 | /* Is there enough data to decode the event? */ | |
475 | if (evt->notif.size < sizeof(*bs)) { | |
476 | dev_err(dev, "BEACON SIZE notification: Not enough data to " | |
477 | "decode (%zu vs %zu bytes needed)\n", | |
478 | evt->notif.size, sizeof(*bs)); | |
479 | goto error; | |
480 | } | |
481 | bs = container_of(evt->notif.rceb, struct uwb_rc_evt_beacon_size, rceb); | |
482 | if (0) | |
483 | dev_info(dev, "Beacon size changed to %u bytes " | |
484 | "(FIXME: action?)\n", le16_to_cpu(bs->wNewBeaconSize)); | |
485 | else { | |
486 | /* temporary hack until we do something with this message... */ | |
487 | static unsigned count; | |
488 | if (++count % 1000 == 0) | |
489 | dev_info(dev, "Beacon size changed %u times " | |
490 | "(FIXME: action?)\n", count); | |
491 | } | |
492 | result = 0; | |
493 | error: | |
494 | return result; | |
495 | } | |
496 | ||
497 | /** | |
498 | * uwbd_evt_handle_rc_bp_slot_change - handle a BP_SLOT_CHANGE event | |
499 | * @evt: the BP_SLOT_CHANGE notification from the radio controller | |
500 | * | |
501 | * If the event indicates that no beacon period slots were available | |
502 | * then radio controller has transitioned to a non-beaconing state. | |
503 | * Otherwise, simply save the current beacon slot. | |
504 | */ | |
505 | int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *evt) | |
506 | { | |
507 | struct uwb_rc *rc = evt->rc; | |
508 | struct device *dev = &rc->uwb_dev.dev; | |
509 | struct uwb_rc_evt_bp_slot_change *bpsc; | |
510 | ||
511 | if (evt->notif.size < sizeof(*bpsc)) { | |
512 | dev_err(dev, "BP SLOT CHANGE event: Not enough data\n"); | |
513 | return -EINVAL; | |
514 | } | |
515 | bpsc = container_of(evt->notif.rceb, struct uwb_rc_evt_bp_slot_change, rceb); | |
516 | ||
517 | mutex_lock(&rc->uwb_dev.mutex); | |
518 | if (uwb_rc_evt_bp_slot_change_no_slot(bpsc)) { | |
519 | dev_info(dev, "stopped beaconing: No free slots in BP\n"); | |
520 | rc->beaconing = -1; | |
521 | } else | |
522 | rc->uwb_dev.beacon_slot = uwb_rc_evt_bp_slot_change_slot_num(bpsc); | |
523 | mutex_unlock(&rc->uwb_dev.mutex); | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | /** | |
529 | * Handle UWB_RC_EVT_BPOIE_CHANGE events | |
530 | * | |
531 | * XXXXX | |
532 | */ | |
533 | struct uwb_ie_bpo { | |
534 | struct uwb_ie_hdr hdr; | |
535 | u8 bp_length; | |
536 | u8 data[]; | |
537 | } __attribute__((packed)); | |
538 | ||
539 | int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *evt) | |
540 | { | |
541 | int result = -EINVAL; | |
542 | struct device *dev = &evt->rc->uwb_dev.dev; | |
543 | struct uwb_rc_evt_bpoie_change *bpoiec; | |
544 | struct uwb_ie_bpo *bpoie; | |
545 | static unsigned count; /* FIXME: this is a temp hack */ | |
546 | size_t iesize; | |
547 | ||
548 | /* Is there enough data to decode it? */ | |
549 | if (evt->notif.size < sizeof(*bpoiec)) { | |
550 | dev_err(dev, "BPOIEC notification: Not enough data to " | |
551 | "decode (%zu vs %zu bytes needed)\n", | |
552 | evt->notif.size, sizeof(*bpoiec)); | |
553 | goto error; | |
554 | } | |
555 | bpoiec = container_of(evt->notif.rceb, struct uwb_rc_evt_bpoie_change, rceb); | |
556 | iesize = le16_to_cpu(bpoiec->wBPOIELength); | |
557 | if (iesize < sizeof(*bpoie)) { | |
558 | dev_err(dev, "BPOIEC notification: Not enough IE data to " | |
559 | "decode (%zu vs %zu bytes needed)\n", | |
560 | iesize, sizeof(*bpoie)); | |
561 | goto error; | |
562 | } | |
563 | if (++count % 1000 == 0) /* Lame placeholder */ | |
564 | dev_info(dev, "BPOIE: %u changes received\n", count); | |
565 | /* | |
566 | * FIXME: At this point we should go over all the IEs in the | |
567 | * bpoiec->BPOIE array and act on each. | |
568 | */ | |
569 | result = 0; | |
570 | error: | |
571 | return result; | |
572 | } | |
573 | ||
22d203ec IPG |
574 | /* |
575 | * Print beaconing state. | |
576 | */ | |
577 | static ssize_t uwb_rc_beacon_show(struct device *dev, | |
578 | struct device_attribute *attr, char *buf) | |
579 | { | |
580 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
581 | struct uwb_rc *rc = uwb_dev->rc; | |
582 | ssize_t result; | |
583 | ||
584 | mutex_lock(&rc->uwb_dev.mutex); | |
585 | result = sprintf(buf, "%d\n", rc->beaconing); | |
586 | mutex_unlock(&rc->uwb_dev.mutex); | |
587 | return result; | |
588 | } | |
589 | ||
590 | /* | |
591 | * Start beaconing on the specified channel, or stop beaconing. | |
22d203ec IPG |
592 | */ |
593 | static ssize_t uwb_rc_beacon_store(struct device *dev, | |
594 | struct device_attribute *attr, | |
595 | const char *buf, size_t size) | |
596 | { | |
597 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
598 | struct uwb_rc *rc = uwb_dev->rc; | |
599 | int channel; | |
22d203ec IPG |
600 | ssize_t result = -EINVAL; |
601 | ||
6fae35f9 | 602 | result = sscanf(buf, "%d", &channel); |
22d203ec | 603 | if (result >= 1) |
6fae35f9 | 604 | result = uwb_radio_force_channel(rc, channel); |
22d203ec IPG |
605 | |
606 | return result < 0 ? result : size; | |
607 | } | |
608 | DEVICE_ATTR(beacon, S_IRUGO | S_IWUSR, uwb_rc_beacon_show, uwb_rc_beacon_store); |