Commit | Line | Data |
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04672fe6 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
22d203ec IPG |
2 | /* |
3 | * Ultra Wide Band | |
4 | * Beacon management | |
5 | * | |
6 | * Copyright (C) 2005-2006 Intel Corporation | |
7 | * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> | |
8 | * | |
22d203ec IPG |
9 | * FIXME: docs |
10 | */ | |
22d203ec IPG |
11 | #include <linux/kernel.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/kdev_t.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
22d203ec | 18 | |
bce83697 | 19 | #include "uwb-internal.h" |
22d203ec | 20 | |
bce83697 | 21 | /* Start Beaconing command structure */ |
22d203ec IPG |
22 | struct uwb_rc_cmd_start_beacon { |
23 | struct uwb_rccb rccb; | |
24 | __le16 wBPSTOffset; | |
25 | u8 bChannelNumber; | |
26 | } __attribute__((packed)); | |
27 | ||
28 | ||
29 | static int uwb_rc_start_beacon(struct uwb_rc *rc, u16 bpst_offset, u8 channel) | |
30 | { | |
31 | int result; | |
32 | struct uwb_rc_cmd_start_beacon *cmd; | |
33 | struct uwb_rc_evt_confirm reply; | |
34 | ||
35 | cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); | |
36 | if (cmd == NULL) | |
37 | return -ENOMEM; | |
38 | cmd->rccb.bCommandType = UWB_RC_CET_GENERAL; | |
39 | cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_START_BEACON); | |
40 | cmd->wBPSTOffset = cpu_to_le16(bpst_offset); | |
41 | cmd->bChannelNumber = channel; | |
42 | reply.rceb.bEventType = UWB_RC_CET_GENERAL; | |
43 | reply.rceb.wEvent = UWB_RC_CMD_START_BEACON; | |
44 | result = uwb_rc_cmd(rc, "START-BEACON", &cmd->rccb, sizeof(*cmd), | |
45 | &reply.rceb, sizeof(reply)); | |
46 | if (result < 0) | |
47 | goto error_cmd; | |
48 | if (reply.bResultCode != UWB_RC_RES_SUCCESS) { | |
49 | dev_err(&rc->uwb_dev.dev, | |
50 | "START-BEACON: command execution failed: %s (%d)\n", | |
51 | uwb_rc_strerror(reply.bResultCode), reply.bResultCode); | |
52 | result = -EIO; | |
53 | } | |
54 | error_cmd: | |
55 | kfree(cmd); | |
56 | return result; | |
57 | } | |
58 | ||
59 | static int uwb_rc_stop_beacon(struct uwb_rc *rc) | |
60 | { | |
61 | int result; | |
62 | struct uwb_rccb *cmd; | |
63 | struct uwb_rc_evt_confirm reply; | |
64 | ||
65 | cmd = kzalloc(sizeof(*cmd), GFP_KERNEL); | |
66 | if (cmd == NULL) | |
67 | return -ENOMEM; | |
68 | cmd->bCommandType = UWB_RC_CET_GENERAL; | |
69 | cmd->wCommand = cpu_to_le16(UWB_RC_CMD_STOP_BEACON); | |
70 | reply.rceb.bEventType = UWB_RC_CET_GENERAL; | |
71 | reply.rceb.wEvent = UWB_RC_CMD_STOP_BEACON; | |
72 | result = uwb_rc_cmd(rc, "STOP-BEACON", cmd, sizeof(*cmd), | |
73 | &reply.rceb, sizeof(reply)); | |
74 | if (result < 0) | |
75 | goto error_cmd; | |
76 | if (reply.bResultCode != UWB_RC_RES_SUCCESS) { | |
77 | dev_err(&rc->uwb_dev.dev, | |
78 | "STOP-BEACON: command execution failed: %s (%d)\n", | |
79 | uwb_rc_strerror(reply.bResultCode), reply.bResultCode); | |
80 | result = -EIO; | |
81 | } | |
82 | error_cmd: | |
83 | kfree(cmd); | |
84 | return result; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Start/stop beacons | |
89 | * | |
90 | * @rc: UWB Radio Controller to operate on | |
91 | * @channel: UWB channel on which to beacon (WUSB[table | |
92 | * 5-12]). If -1, stop beaconing. | |
93 | * @bpst_offset: Beacon Period Start Time offset; FIXME-do zero | |
94 | * | |
95 | * According to WHCI 0.95 [4.13.6] the driver will only receive the RCEB | |
96 | * of a SET IE command after the device sent the first beacon that includes | |
97 | * the IEs specified in the SET IE command. So, after we start beaconing we | |
98 | * check if there is anything in the IE cache and call the SET IE command | |
99 | * if needed. | |
100 | */ | |
101 | int uwb_rc_beacon(struct uwb_rc *rc, int channel, unsigned bpst_offset) | |
102 | { | |
103 | int result; | |
104 | struct device *dev = &rc->uwb_dev.dev; | |
105 | ||
f79833a7 | 106 | dev_dbg(dev, "%s: channel = %d\n", __func__, channel); |
22d203ec IPG |
107 | if (channel < 0) |
108 | channel = -1; | |
109 | if (channel == -1) | |
110 | result = uwb_rc_stop_beacon(rc); | |
111 | else { | |
112 | /* channel >= 0...dah */ | |
113 | result = uwb_rc_start_beacon(rc, bpst_offset, channel); | |
7b360ee0 TP |
114 | if (result < 0) { |
115 | dev_err(dev, "Cannot start beaconing: %d\n", result); | |
6fae35f9 | 116 | return result; |
7b360ee0 | 117 | } |
22d203ec IPG |
118 | if (le16_to_cpu(rc->ies->wIELength) > 0) { |
119 | result = uwb_rc_set_ie(rc, rc->ies); | |
120 | if (result < 0) { | |
121 | dev_err(dev, "Cannot set new IE on device: " | |
122 | "%d\n", result); | |
123 | result = uwb_rc_stop_beacon(rc); | |
124 | channel = -1; | |
125 | bpst_offset = 0; | |
6fae35f9 | 126 | } |
22d203ec IPG |
127 | } |
128 | } | |
129 | ||
0996e638 | 130 | if (result >= 0) |
6fae35f9 | 131 | rc->beaconing = channel; |
22d203ec IPG |
132 | return result; |
133 | } | |
134 | ||
135 | /* | |
136 | * Beacon cache | |
137 | * | |
138 | * The purpose of this is to speed up the lookup of becon information | |
139 | * when a new beacon arrives. The UWB Daemon uses it also to keep a | |
140 | * tab of which devices are in radio distance and which not. When a | |
141 | * device's beacon stays present for more than a certain amount of | |
142 | * time, it is considered a new, usable device. When a beacon ceases | |
143 | * to be received for a certain amount of time, it is considered that | |
144 | * the device is gone. | |
145 | * | |
146 | * FIXME: use an allocator for the entries | |
147 | * FIXME: use something faster for search than a list | |
148 | */ | |
149 | ||
22d203ec IPG |
150 | void uwb_bce_kfree(struct kref *_bce) |
151 | { | |
152 | struct uwb_beca_e *bce = container_of(_bce, struct uwb_beca_e, refcnt); | |
153 | ||
154 | kfree(bce->be); | |
155 | kfree(bce); | |
156 | } | |
157 | ||
158 | ||
159 | /* Find a beacon by dev addr in the cache */ | |
160 | static | |
fec1a593 SP |
161 | struct uwb_beca_e *__uwb_beca_find_bydev(struct uwb_rc *rc, |
162 | const struct uwb_dev_addr *dev_addr) | |
22d203ec IPG |
163 | { |
164 | struct uwb_beca_e *bce, *next; | |
fec1a593 | 165 | list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) { |
22d203ec IPG |
166 | if (!memcmp(&bce->dev_addr, dev_addr, sizeof(bce->dev_addr))) |
167 | goto out; | |
168 | } | |
169 | bce = NULL; | |
170 | out: | |
171 | return bce; | |
172 | } | |
173 | ||
174 | /* Find a beacon by dev addr in the cache */ | |
175 | static | |
67d0fb25 | 176 | struct uwb_beca_e *__uwb_beca_find_bymac(struct uwb_rc *rc, |
fec1a593 | 177 | const struct uwb_mac_addr *mac_addr) |
22d203ec IPG |
178 | { |
179 | struct uwb_beca_e *bce, *next; | |
fec1a593 | 180 | list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) { |
22d203ec | 181 | if (!memcmp(bce->mac_addr, mac_addr->data, |
c15895ef | 182 | sizeof(struct uwb_mac_addr))) |
22d203ec IPG |
183 | goto out; |
184 | } | |
185 | bce = NULL; | |
186 | out: | |
187 | return bce; | |
188 | } | |
189 | ||
190 | /** | |
191 | * uwb_dev_get_by_devaddr - get a UWB device with a specific DevAddr | |
192 | * @rc: the radio controller that saw the device | |
193 | * @devaddr: DevAddr of the UWB device to find | |
194 | * | |
195 | * There may be more than one matching device (in the case of a | |
196 | * DevAddr conflict), but only the first one is returned. | |
197 | */ | |
198 | struct uwb_dev *uwb_dev_get_by_devaddr(struct uwb_rc *rc, | |
199 | const struct uwb_dev_addr *devaddr) | |
200 | { | |
201 | struct uwb_dev *found = NULL; | |
202 | struct uwb_beca_e *bce; | |
203 | ||
fec1a593 SP |
204 | mutex_lock(&rc->uwb_beca.mutex); |
205 | bce = __uwb_beca_find_bydev(rc, devaddr); | |
22d203ec IPG |
206 | if (bce) |
207 | found = uwb_dev_try_get(rc, bce->uwb_dev); | |
fec1a593 | 208 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
209 | |
210 | return found; | |
211 | } | |
212 | ||
213 | /** | |
214 | * uwb_dev_get_by_macaddr - get a UWB device with a specific EUI-48 | |
215 | * @rc: the radio controller that saw the device | |
216 | * @devaddr: EUI-48 of the UWB device to find | |
217 | */ | |
218 | struct uwb_dev *uwb_dev_get_by_macaddr(struct uwb_rc *rc, | |
219 | const struct uwb_mac_addr *macaddr) | |
220 | { | |
221 | struct uwb_dev *found = NULL; | |
222 | struct uwb_beca_e *bce; | |
223 | ||
fec1a593 SP |
224 | mutex_lock(&rc->uwb_beca.mutex); |
225 | bce = __uwb_beca_find_bymac(rc, macaddr); | |
22d203ec IPG |
226 | if (bce) |
227 | found = uwb_dev_try_get(rc, bce->uwb_dev); | |
fec1a593 | 228 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
229 | |
230 | return found; | |
231 | } | |
232 | ||
233 | /* Initialize a beacon cache entry */ | |
234 | static void uwb_beca_e_init(struct uwb_beca_e *bce) | |
235 | { | |
236 | mutex_init(&bce->mutex); | |
237 | kref_init(&bce->refcnt); | |
238 | stats_init(&bce->lqe_stats); | |
239 | stats_init(&bce->rssi_stats); | |
240 | } | |
241 | ||
242 | /* | |
243 | * Add a beacon to the cache | |
244 | * | |
245 | * @be: Beacon event information | |
246 | * @bf: Beacon frame (part of b, really) | |
247 | * @ts_jiffies: Timestamp (in jiffies) when the beacon was received | |
248 | */ | |
fec1a593 SP |
249 | static |
250 | struct uwb_beca_e *__uwb_beca_add(struct uwb_rc *rc, | |
251 | struct uwb_rc_evt_beacon *be, | |
22d203ec IPG |
252 | struct uwb_beacon_frame *bf, |
253 | unsigned long ts_jiffies) | |
254 | { | |
255 | struct uwb_beca_e *bce; | |
256 | ||
257 | bce = kzalloc(sizeof(*bce), GFP_KERNEL); | |
258 | if (bce == NULL) | |
259 | return NULL; | |
260 | uwb_beca_e_init(bce); | |
261 | bce->ts_jiffies = ts_jiffies; | |
262 | bce->uwb_dev = NULL; | |
fec1a593 | 263 | list_add(&bce->node, &rc->uwb_beca.list); |
22d203ec IPG |
264 | return bce; |
265 | } | |
266 | ||
267 | /* | |
268 | * Wipe out beacon entries that became stale | |
269 | * | |
270 | * Remove associated devicest too. | |
271 | */ | |
fec1a593 | 272 | void uwb_beca_purge(struct uwb_rc *rc) |
22d203ec IPG |
273 | { |
274 | struct uwb_beca_e *bce, *next; | |
45c16cd9 DV |
275 | unsigned long expires; |
276 | ||
fec1a593 SP |
277 | mutex_lock(&rc->uwb_beca.mutex); |
278 | list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) { | |
45c16cd9 DV |
279 | expires = bce->ts_jiffies + msecs_to_jiffies(beacon_timeout_ms); |
280 | if (time_after(jiffies, expires)) { | |
22d203ec | 281 | uwbd_dev_offair(bce); |
22d203ec IPG |
282 | } |
283 | } | |
fec1a593 | 284 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
285 | } |
286 | ||
287 | /* Clean up the whole beacon cache. Called on shutdown */ | |
fec1a593 | 288 | void uwb_beca_release(struct uwb_rc *rc) |
22d203ec IPG |
289 | { |
290 | struct uwb_beca_e *bce, *next; | |
fec1a593 SP |
291 | |
292 | mutex_lock(&rc->uwb_beca.mutex); | |
293 | list_for_each_entry_safe(bce, next, &rc->uwb_beca.list, node) { | |
22d203ec IPG |
294 | list_del(&bce->node); |
295 | uwb_bce_put(bce); | |
296 | } | |
fec1a593 | 297 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
298 | } |
299 | ||
300 | static void uwb_beacon_print(struct uwb_rc *rc, struct uwb_rc_evt_beacon *be, | |
301 | struct uwb_beacon_frame *bf) | |
302 | { | |
303 | char macbuf[UWB_ADDR_STRSIZE]; | |
304 | char devbuf[UWB_ADDR_STRSIZE]; | |
305 | char dstbuf[UWB_ADDR_STRSIZE]; | |
306 | ||
307 | uwb_mac_addr_print(macbuf, sizeof(macbuf), &bf->Device_Identifier); | |
308 | uwb_dev_addr_print(devbuf, sizeof(devbuf), &bf->hdr.SrcAddr); | |
309 | uwb_dev_addr_print(dstbuf, sizeof(dstbuf), &bf->hdr.DestAddr); | |
310 | dev_info(&rc->uwb_dev.dev, | |
311 | "BEACON from %s to %s (ch%u offset %u slot %u MAC %s)\n", | |
312 | devbuf, dstbuf, be->bChannelNumber, be->wBPSTOffset, | |
313 | bf->Beacon_Slot_Number, macbuf); | |
314 | } | |
315 | ||
316 | /* | |
317 | * @bce: beacon cache entry, referenced | |
318 | */ | |
319 | ssize_t uwb_bce_print_IEs(struct uwb_dev *uwb_dev, struct uwb_beca_e *bce, | |
320 | char *buf, size_t size) | |
321 | { | |
322 | ssize_t result = 0; | |
323 | struct uwb_rc_evt_beacon *be; | |
324 | struct uwb_beacon_frame *bf; | |
1cde7f68 DV |
325 | int ies_len; |
326 | struct uwb_ie_hdr *ies; | |
22d203ec IPG |
327 | |
328 | mutex_lock(&bce->mutex); | |
1cde7f68 | 329 | |
22d203ec | 330 | be = bce->be; |
1cde7f68 DV |
331 | if (be) { |
332 | bf = (struct uwb_beacon_frame *)bce->be->BeaconInfo; | |
333 | ies_len = be->wBeaconInfoLength - sizeof(struct uwb_beacon_frame); | |
334 | ies = (struct uwb_ie_hdr *)bf->IEData; | |
335 | ||
336 | result = uwb_ie_dump_hex(ies, ies_len, buf, size); | |
337 | } | |
338 | ||
22d203ec | 339 | mutex_unlock(&bce->mutex); |
1cde7f68 | 340 | |
22d203ec IPG |
341 | return result; |
342 | } | |
343 | ||
344 | /* | |
345 | * Verify that the beacon event, frame and IEs are ok | |
346 | */ | |
347 | static int uwb_verify_beacon(struct uwb_rc *rc, struct uwb_event *evt, | |
348 | struct uwb_rc_evt_beacon *be) | |
349 | { | |
350 | int result = -EINVAL; | |
351 | struct uwb_beacon_frame *bf; | |
352 | struct device *dev = &rc->uwb_dev.dev; | |
353 | ||
354 | /* Is there enough data to decode a beacon frame? */ | |
355 | if (evt->notif.size < sizeof(*be) + sizeof(*bf)) { | |
356 | dev_err(dev, "BEACON event: Not enough data to decode " | |
357 | "(%zu vs %zu bytes needed)\n", evt->notif.size, | |
358 | sizeof(*be) + sizeof(*bf)); | |
359 | goto error; | |
360 | } | |
361 | /* FIXME: make sure beacon frame IEs are fine and that the whole thing | |
362 | * is consistent */ | |
363 | result = 0; | |
364 | error: | |
365 | return result; | |
366 | } | |
367 | ||
368 | /* | |
369 | * Handle UWB_RC_EVT_BEACON events | |
370 | * | |
371 | * We check the beacon cache to see how the received beacon fares. If | |
372 | * is there already we refresh the timestamp. If not we create a new | |
373 | * entry. | |
374 | * | |
375 | * According to the WHCI and WUSB specs, only one beacon frame is | |
376 | * allowed per notification block, so we don't bother about scanning | |
377 | * for more. | |
378 | */ | |
379 | int uwbd_evt_handle_rc_beacon(struct uwb_event *evt) | |
380 | { | |
381 | int result = -EINVAL; | |
382 | struct uwb_rc *rc; | |
383 | struct uwb_rc_evt_beacon *be; | |
384 | struct uwb_beacon_frame *bf; | |
385 | struct uwb_beca_e *bce; | |
22d203ec IPG |
386 | |
387 | rc = evt->rc; | |
388 | be = container_of(evt->notif.rceb, struct uwb_rc_evt_beacon, rceb); | |
389 | result = uwb_verify_beacon(rc, evt, be); | |
390 | if (result < 0) | |
391 | return result; | |
392 | ||
8092d7c9 | 393 | /* FIXME: handle alien beacons. */ |
22d203ec IPG |
394 | if (be->bBeaconType == UWB_RC_BEACON_TYPE_OL_ALIEN || |
395 | be->bBeaconType == UWB_RC_BEACON_TYPE_NOL_ALIEN) { | |
8092d7c9 | 396 | return -ENOSYS; |
22d203ec | 397 | } |
8092d7c9 | 398 | |
22d203ec IPG |
399 | bf = (struct uwb_beacon_frame *) be->BeaconInfo; |
400 | ||
401 | /* | |
402 | * Drop beacons from devices with a NULL EUI-48 -- they cannot | |
403 | * be uniquely identified. | |
404 | * | |
405 | * It's expected that these will all be WUSB devices and they | |
406 | * have a WUSB specific connection method so ignoring them | |
407 | * here shouldn't be a problem. | |
408 | */ | |
409 | if (uwb_mac_addr_bcast(&bf->Device_Identifier)) | |
410 | return 0; | |
411 | ||
fec1a593 SP |
412 | mutex_lock(&rc->uwb_beca.mutex); |
413 | bce = __uwb_beca_find_bymac(rc, &bf->Device_Identifier); | |
22d203ec IPG |
414 | if (bce == NULL) { |
415 | /* Not in there, a new device is pinging */ | |
416 | uwb_beacon_print(evt->rc, be, bf); | |
fec1a593 | 417 | bce = __uwb_beca_add(rc, be, bf, evt->ts_jiffies); |
22d203ec | 418 | if (bce == NULL) { |
fec1a593 | 419 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
420 | return -ENOMEM; |
421 | } | |
422 | } | |
fec1a593 | 423 | mutex_unlock(&rc->uwb_beca.mutex); |
22d203ec IPG |
424 | |
425 | mutex_lock(&bce->mutex); | |
426 | /* purge old beacon data */ | |
427 | kfree(bce->be); | |
428 | ||
22d203ec IPG |
429 | /* Update commonly used fields */ |
430 | bce->ts_jiffies = evt->ts_jiffies; | |
431 | bce->be = be; | |
432 | bce->dev_addr = bf->hdr.SrcAddr; | |
433 | bce->mac_addr = &bf->Device_Identifier; | |
434 | be->wBPSTOffset = le16_to_cpu(be->wBPSTOffset); | |
435 | be->wBeaconInfoLength = le16_to_cpu(be->wBeaconInfoLength); | |
436 | stats_add_sample(&bce->lqe_stats, be->bLQI - 7); | |
437 | stats_add_sample(&bce->rssi_stats, be->bRSSI + 18); | |
438 | ||
439 | /* | |
440 | * This might be a beacon from a new device. | |
441 | */ | |
442 | if (bce->uwb_dev == NULL) | |
443 | uwbd_dev_onair(evt->rc, bce); | |
444 | ||
445 | mutex_unlock(&bce->mutex); | |
446 | ||
447 | return 1; /* we keep the event data */ | |
448 | } | |
449 | ||
450 | /* | |
451 | * Handle UWB_RC_EVT_BEACON_SIZE events | |
452 | * | |
453 | * XXXXX | |
454 | */ | |
455 | int uwbd_evt_handle_rc_beacon_size(struct uwb_event *evt) | |
456 | { | |
457 | int result = -EINVAL; | |
458 | struct device *dev = &evt->rc->uwb_dev.dev; | |
459 | struct uwb_rc_evt_beacon_size *bs; | |
460 | ||
461 | /* Is there enough data to decode the event? */ | |
462 | if (evt->notif.size < sizeof(*bs)) { | |
463 | dev_err(dev, "BEACON SIZE notification: Not enough data to " | |
464 | "decode (%zu vs %zu bytes needed)\n", | |
465 | evt->notif.size, sizeof(*bs)); | |
466 | goto error; | |
467 | } | |
468 | bs = container_of(evt->notif.rceb, struct uwb_rc_evt_beacon_size, rceb); | |
469 | if (0) | |
470 | dev_info(dev, "Beacon size changed to %u bytes " | |
471 | "(FIXME: action?)\n", le16_to_cpu(bs->wNewBeaconSize)); | |
472 | else { | |
473 | /* temporary hack until we do something with this message... */ | |
474 | static unsigned count; | |
475 | if (++count % 1000 == 0) | |
476 | dev_info(dev, "Beacon size changed %u times " | |
477 | "(FIXME: action?)\n", count); | |
478 | } | |
479 | result = 0; | |
480 | error: | |
481 | return result; | |
482 | } | |
483 | ||
484 | /** | |
485 | * uwbd_evt_handle_rc_bp_slot_change - handle a BP_SLOT_CHANGE event | |
486 | * @evt: the BP_SLOT_CHANGE notification from the radio controller | |
487 | * | |
488 | * If the event indicates that no beacon period slots were available | |
489 | * then radio controller has transitioned to a non-beaconing state. | |
490 | * Otherwise, simply save the current beacon slot. | |
491 | */ | |
492 | int uwbd_evt_handle_rc_bp_slot_change(struct uwb_event *evt) | |
493 | { | |
494 | struct uwb_rc *rc = evt->rc; | |
495 | struct device *dev = &rc->uwb_dev.dev; | |
496 | struct uwb_rc_evt_bp_slot_change *bpsc; | |
497 | ||
498 | if (evt->notif.size < sizeof(*bpsc)) { | |
499 | dev_err(dev, "BP SLOT CHANGE event: Not enough data\n"); | |
500 | return -EINVAL; | |
501 | } | |
502 | bpsc = container_of(evt->notif.rceb, struct uwb_rc_evt_bp_slot_change, rceb); | |
503 | ||
22d203ec | 504 | if (uwb_rc_evt_bp_slot_change_no_slot(bpsc)) { |
f79833a7 | 505 | dev_err(dev, "stopped beaconing: No free slots in BP\n"); |
1fc671b3 | 506 | mutex_lock(&rc->uwb_dev.mutex); |
22d203ec | 507 | rc->beaconing = -1; |
1fc671b3 | 508 | mutex_unlock(&rc->uwb_dev.mutex); |
22d203ec IPG |
509 | } else |
510 | rc->uwb_dev.beacon_slot = uwb_rc_evt_bp_slot_change_slot_num(bpsc); | |
22d203ec IPG |
511 | |
512 | return 0; | |
513 | } | |
514 | ||
515 | /** | |
516 | * Handle UWB_RC_EVT_BPOIE_CHANGE events | |
517 | * | |
518 | * XXXXX | |
519 | */ | |
520 | struct uwb_ie_bpo { | |
521 | struct uwb_ie_hdr hdr; | |
522 | u8 bp_length; | |
523 | u8 data[]; | |
524 | } __attribute__((packed)); | |
525 | ||
526 | int uwbd_evt_handle_rc_bpoie_change(struct uwb_event *evt) | |
527 | { | |
528 | int result = -EINVAL; | |
529 | struct device *dev = &evt->rc->uwb_dev.dev; | |
530 | struct uwb_rc_evt_bpoie_change *bpoiec; | |
531 | struct uwb_ie_bpo *bpoie; | |
532 | static unsigned count; /* FIXME: this is a temp hack */ | |
533 | size_t iesize; | |
534 | ||
535 | /* Is there enough data to decode it? */ | |
536 | if (evt->notif.size < sizeof(*bpoiec)) { | |
537 | dev_err(dev, "BPOIEC notification: Not enough data to " | |
538 | "decode (%zu vs %zu bytes needed)\n", | |
539 | evt->notif.size, sizeof(*bpoiec)); | |
540 | goto error; | |
541 | } | |
542 | bpoiec = container_of(evt->notif.rceb, struct uwb_rc_evt_bpoie_change, rceb); | |
543 | iesize = le16_to_cpu(bpoiec->wBPOIELength); | |
544 | if (iesize < sizeof(*bpoie)) { | |
545 | dev_err(dev, "BPOIEC notification: Not enough IE data to " | |
546 | "decode (%zu vs %zu bytes needed)\n", | |
547 | iesize, sizeof(*bpoie)); | |
548 | goto error; | |
549 | } | |
550 | if (++count % 1000 == 0) /* Lame placeholder */ | |
551 | dev_info(dev, "BPOIE: %u changes received\n", count); | |
552 | /* | |
553 | * FIXME: At this point we should go over all the IEs in the | |
554 | * bpoiec->BPOIE array and act on each. | |
555 | */ | |
556 | result = 0; | |
557 | error: | |
558 | return result; | |
559 | } | |
560 | ||
22d203ec IPG |
561 | /* |
562 | * Print beaconing state. | |
563 | */ | |
564 | static ssize_t uwb_rc_beacon_show(struct device *dev, | |
565 | struct device_attribute *attr, char *buf) | |
566 | { | |
567 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
568 | struct uwb_rc *rc = uwb_dev->rc; | |
569 | ssize_t result; | |
570 | ||
571 | mutex_lock(&rc->uwb_dev.mutex); | |
572 | result = sprintf(buf, "%d\n", rc->beaconing); | |
573 | mutex_unlock(&rc->uwb_dev.mutex); | |
574 | return result; | |
575 | } | |
576 | ||
577 | /* | |
578 | * Start beaconing on the specified channel, or stop beaconing. | |
22d203ec IPG |
579 | */ |
580 | static ssize_t uwb_rc_beacon_store(struct device *dev, | |
581 | struct device_attribute *attr, | |
582 | const char *buf, size_t size) | |
583 | { | |
584 | struct uwb_dev *uwb_dev = to_uwb_dev(dev); | |
585 | struct uwb_rc *rc = uwb_dev->rc; | |
586 | int channel; | |
22d203ec IPG |
587 | ssize_t result = -EINVAL; |
588 | ||
6fae35f9 | 589 | result = sscanf(buf, "%d", &channel); |
22d203ec | 590 | if (result >= 1) |
6fae35f9 | 591 | result = uwb_radio_force_channel(rc, channel); |
22d203ec IPG |
592 | |
593 | return result < 0 ? result : size; | |
594 | } | |
595 | DEVICE_ATTR(beacon, S_IRUGO | S_IWUSR, uwb_rc_beacon_show, uwb_rc_beacon_store); |