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initial commit with v2.6.32.60
[linux-2.6.32.60-moxart.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
blobfaa286ff69391e0e1ca7de8a5a771fb7ed71fc03
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2009 Intel Corporation. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
19 * USA
20 *
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * Contact Information:
25 * Intel Linux Wireless <ilw@linux.intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28 #include <linux/types.h>
29 #include <linux/etherdevice.h>
30 #include <net/lib80211.h>
31 #include <net/mac80211.h>
32
33 #include "iwl-eeprom.h"
34 #include "iwl-dev.h"
35 #include "iwl-core.h"
36 #include "iwl-sta.h"
37 #include "iwl-io.h"
38 #include "iwl-helpers.h"
39
40 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
41 * sending probe req. This should be set long enough to hear probe responses
42 * from more than one AP. */
43 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
44 #define IWL_ACTIVE_DWELL_TIME_52 (20)
45
46 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
47 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
48
49 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
50 * Must be set longer than active dwell time.
51 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
52 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
53 #define IWL_PASSIVE_DWELL_TIME_52 (10)
54 #define IWL_PASSIVE_DWELL_BASE (100)
55 #define IWL_CHANNEL_TUNE_TIME 5
56
57
58
59 /**
60 * iwl_scan_cancel - Cancel any currently executing HW scan
61 *
62 * NOTE: priv->mutex is not required before calling this function
63 */
64 int iwl_scan_cancel(struct iwl_priv *priv)
65 {
66 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
67 clear_bit(STATUS_SCANNING, &priv->status);
68 return 0;
69 }
70
71 if (test_bit(STATUS_SCANNING, &priv->status)) {
72 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
73 IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
74 set_bit(STATUS_SCAN_ABORTING, &priv->status);
75 queue_work(priv->workqueue, &priv->abort_scan);
76
77 } else
78 IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
79
80 return test_bit(STATUS_SCANNING, &priv->status);
81 }
82
83 return 0;
84 }
85 EXPORT_SYMBOL(iwl_scan_cancel);
86 /**
87 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
88 * @ms: amount of time to wait (in milliseconds) for scan to abort
89 *
90 * NOTE: priv->mutex must be held before calling this function
91 */
92 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
93 {
94 unsigned long now = jiffies;
95 int ret;
96
97 ret = iwl_scan_cancel(priv);
98 if (ret && ms) {
99 mutex_unlock(&priv->mutex);
100 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
101 test_bit(STATUS_SCANNING, &priv->status))
102 msleep(1);
103 mutex_lock(&priv->mutex);
104
105 return test_bit(STATUS_SCANNING, &priv->status);
106 }
107
108 return ret;
109 }
110 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
111
112 static int iwl_send_scan_abort(struct iwl_priv *priv)
113 {
114 int ret = 0;
115 struct iwl_rx_packet *res;
116 struct iwl_host_cmd cmd = {
117 .id = REPLY_SCAN_ABORT_CMD,
118 .flags = CMD_WANT_SKB,
119 };
120
121 /* If there isn't a scan actively going on in the hardware
122 * then we are in between scan bands and not actually
123 * actively scanning, so don't send the abort command */
124 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
125 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
126 return 0;
127 }
128
129 ret = iwl_send_cmd_sync(priv, &cmd);
130 if (ret) {
131 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
132 return ret;
133 }
134
135 res = (struct iwl_rx_packet *)cmd.reply_skb->data;
136 if (res->u.status != CAN_ABORT_STATUS) {
137 /* The scan abort will return 1 for success or
138 * 2 for "failure". A failure condition can be
139 * due to simply not being in an active scan which
140 * can occur if we send the scan abort before we
141 * the microcode has notified us that a scan is
142 * completed. */
143 IWL_DEBUG_INFO(priv, "SCAN_ABORT returned %d.\n", res->u.status);
144 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
145 clear_bit(STATUS_SCAN_HW, &priv->status);
146 }
147
148 priv->alloc_rxb_skb--;
149 dev_kfree_skb_any(cmd.reply_skb);
150
151 return ret;
152 }
153
154 /* Service response to REPLY_SCAN_CMD (0x80) */
155 static void iwl_rx_reply_scan(struct iwl_priv *priv,
156 struct iwl_rx_mem_buffer *rxb)
157 {
158 #ifdef CONFIG_IWLWIFI_DEBUG
159 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
160 struct iwl_scanreq_notification *notif =
161 (struct iwl_scanreq_notification *)pkt->u.raw;
162
163 IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
164 #endif
165 }
166
167 /* Service SCAN_START_NOTIFICATION (0x82) */
168 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
169 struct iwl_rx_mem_buffer *rxb)
170 {
171 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
172 struct iwl_scanstart_notification *notif =
173 (struct iwl_scanstart_notification *)pkt->u.raw;
174 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
175 IWL_DEBUG_SCAN(priv, "Scan start: "
176 "%d [802.11%s] "
177 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
178 notif->channel,
179 notif->band ? "bg" : "a",
180 le32_to_cpu(notif->tsf_high),
181 le32_to_cpu(notif->tsf_low),
182 notif->status, notif->beacon_timer);
183 }
184
185 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
186 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
187 struct iwl_rx_mem_buffer *rxb)
188 {
189 #ifdef CONFIG_IWLWIFI_DEBUG
190 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
191 struct iwl_scanresults_notification *notif =
192 (struct iwl_scanresults_notification *)pkt->u.raw;
193
194 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
195 "%d [802.11%s] "
196 "(TSF: 0x%08X:%08X) - %d "
197 "elapsed=%lu usec (%dms since last)\n",
198 notif->channel,
199 notif->band ? "bg" : "a",
200 le32_to_cpu(notif->tsf_high),
201 le32_to_cpu(notif->tsf_low),
202 le32_to_cpu(notif->statistics[0]),
203 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf,
204 jiffies_to_msecs(elapsed_jiffies
205 (priv->last_scan_jiffies, jiffies)));
206 #endif
207
208 priv->last_scan_jiffies = jiffies;
209 priv->next_scan_jiffies = 0;
210 }
211
212 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
213 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
214 struct iwl_rx_mem_buffer *rxb)
215 {
216 #ifdef CONFIG_IWLWIFI_DEBUG
217 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
218 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
219
220 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
221 scan_notif->scanned_channels,
222 scan_notif->tsf_low,
223 scan_notif->tsf_high, scan_notif->status);
224 #endif
225
226 /* The HW is no longer scanning */
227 clear_bit(STATUS_SCAN_HW, &priv->status);
228
229 IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n",
230 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
231 "2.4" : "5.2",
232 jiffies_to_msecs(elapsed_jiffies
233 (priv->scan_pass_start, jiffies)));
234
235 /* Remove this scanned band from the list of pending
236 * bands to scan, band G precedes A in order of scanning
237 * as seen in iwl_bg_request_scan */
238 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
239 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
240 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
241 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
242
243 /* If a request to abort was given, or the scan did not succeed
244 * then we reset the scan state machine and terminate,
245 * re-queuing another scan if one has been requested */
246 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
247 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
248 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
249 } else {
250 /* If there are more bands on this scan pass reschedule */
251 if (priv->scan_bands)
252 goto reschedule;
253 }
254
255 priv->last_scan_jiffies = jiffies;
256 priv->next_scan_jiffies = 0;
257 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
258
259 clear_bit(STATUS_SCANNING, &priv->status);
260
261 IWL_DEBUG_INFO(priv, "Scan took %dms\n",
262 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
263
264 queue_work(priv->workqueue, &priv->scan_completed);
265
266 return;
267
268 reschedule:
269 priv->scan_pass_start = jiffies;
270 queue_work(priv->workqueue, &priv->request_scan);
271 }
272
273 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
274 {
275 /* scan handlers */
276 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
277 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
278 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
279 iwl_rx_scan_results_notif;
280 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
281 iwl_rx_scan_complete_notif;
282 }
283 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
284
285 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
286 enum ieee80211_band band,
287 u8 n_probes)
288 {
289 if (band == IEEE80211_BAND_5GHZ)
290 return IWL_ACTIVE_DWELL_TIME_52 +
291 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
292 else
293 return IWL_ACTIVE_DWELL_TIME_24 +
294 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
295 }
296 EXPORT_SYMBOL(iwl_get_active_dwell_time);
297
298 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
299 enum ieee80211_band band)
300 {
301 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
302 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
303 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
304
305 if (iwl_is_associated(priv)) {
306 /* If we're associated, we clamp the maximum passive
307 * dwell time to be 98% of the beacon interval (minus
308 * 2 * channel tune time) */
309 passive = priv->beacon_int;
310 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
311 passive = IWL_PASSIVE_DWELL_BASE;
312 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
313 }
314
315 return passive;
316 }
317 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
318
319 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
320 enum ieee80211_band band,
321 u8 is_active, u8 n_probes,
322 struct iwl_scan_channel *scan_ch)
323 {
324 struct ieee80211_channel *chan;
325 const struct ieee80211_supported_band *sband;
326 const struct iwl_channel_info *ch_info;
327 u16 passive_dwell = 0;
328 u16 active_dwell = 0;
329 int added, i;
330 u16 channel;
331
332 sband = iwl_get_hw_mode(priv, band);
333 if (!sband)
334 return 0;
335
336 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
337 passive_dwell = iwl_get_passive_dwell_time(priv, band);
338
339 if (passive_dwell <= active_dwell)
340 passive_dwell = active_dwell + 1;
341
342 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
343 chan = priv->scan_request->channels[i];
344
345 if (chan->band != band)
346 continue;
347
348 channel = ieee80211_frequency_to_channel(chan->center_freq);
349 scan_ch->channel = cpu_to_le16(channel);
350
351 ch_info = iwl_get_channel_info(priv, band, channel);
352 if (!is_channel_valid(ch_info)) {
353 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
354 channel);
355 continue;
356 }
357
358 if (!is_active || is_channel_passive(ch_info) ||
359 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
360 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
361 else
362 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
363
364 if (n_probes)
365 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
366
367 scan_ch->active_dwell = cpu_to_le16(active_dwell);
368 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
369
370 /* Set txpower levels to defaults */
371 scan_ch->dsp_atten = 110;
372
373 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
374 * power level:
375 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
376 */
377 if (band == IEEE80211_BAND_5GHZ)
378 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
379 else
380 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
381
382 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
383 channel, le32_to_cpu(scan_ch->type),
384 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
385 "ACTIVE" : "PASSIVE",
386 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
387 active_dwell : passive_dwell);
388
389 scan_ch++;
390 added++;
391 }
392
393 IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
394 return added;
395 }
396
397 void iwl_init_scan_params(struct iwl_priv *priv)
398 {
399 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
400 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
401 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
402 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
403 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
404 }
405
406 static int iwl_scan_initiate(struct iwl_priv *priv)
407 {
408 IWL_DEBUG_INFO(priv, "Starting scan...\n");
409 set_bit(STATUS_SCANNING, &priv->status);
410 priv->scan_start = jiffies;
411 priv->scan_pass_start = priv->scan_start;
412
413 queue_work(priv->workqueue, &priv->request_scan);
414
415 return 0;
416 }
417
418 #define IWL_DELAY_NEXT_SCAN (HZ*2)
419
420 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
421 struct cfg80211_scan_request *req)
422 {
423 unsigned long flags;
424 struct iwl_priv *priv = hw->priv;
425 int ret, i;
426
427 IWL_DEBUG_MAC80211(priv, "enter\n");
428
429 mutex_lock(&priv->mutex);
430 spin_lock_irqsave(&priv->lock, flags);
431
432 if (!iwl_is_ready_rf(priv)) {
433 ret = -EIO;
434 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
435 goto out_unlock;
436 }
437
438 if (test_bit(STATUS_SCANNING, &priv->status)) {
439 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
440 ret = -EAGAIN;
441 goto out_unlock;
442 }
443
444 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
445 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
446 ret = -EAGAIN;
447 goto out_unlock;
448 }
449
450 /* We don't schedule scan within next_scan_jiffies period.
451 * Avoid scanning during possible EAPOL exchange, return
452 * success immediately.
453 */
454 if (priv->next_scan_jiffies &&
455 time_after(priv->next_scan_jiffies, jiffies)) {
456 IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n");
457 queue_work(priv->workqueue, &priv->scan_completed);
458 ret = 0;
459 goto out_unlock;
460 }
461
462 /* if we just finished scan ask for delay */
463 if (iwl_is_associated(priv) && priv->last_scan_jiffies &&
464 time_after(priv->last_scan_jiffies + IWL_DELAY_NEXT_SCAN, jiffies)) {
465 IWL_DEBUG_SCAN(priv, "scan rejected: within previous scan period\n");
466 queue_work(priv->workqueue, &priv->scan_completed);
467 ret = 0;
468 goto out_unlock;
469 }
470
471 priv->scan_bands = 0;
472 for (i = 0; i < req->n_channels; i++)
473 priv->scan_bands |= BIT(req->channels[i]->band);
474
475 priv->scan_request = req;
476
477 ret = iwl_scan_initiate(priv);
478
479 IWL_DEBUG_MAC80211(priv, "leave\n");
480
481 out_unlock:
482 spin_unlock_irqrestore(&priv->lock, flags);
483 mutex_unlock(&priv->mutex);
484
485 return ret;
486 }
487 EXPORT_SYMBOL(iwl_mac_hw_scan);
488
489 #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
490
491 void iwl_bg_scan_check(struct work_struct *data)
492 {
493 struct iwl_priv *priv =
494 container_of(data, struct iwl_priv, scan_check.work);
495
496 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
497 return;
498
499 mutex_lock(&priv->mutex);
500 if (test_bit(STATUS_SCANNING, &priv->status) &&
501 !test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
502 IWL_DEBUG_SCAN(priv, "Scan completion watchdog (%dms)\n",
503 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
504
505 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
506 iwl_send_scan_abort(priv);
507 }
508 mutex_unlock(&priv->mutex);
509 }
510 EXPORT_SYMBOL(iwl_bg_scan_check);
511
512 /**
513 * iwl_fill_probe_req - fill in all required fields and IE for probe request
514 */
515
516 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
517 const u8 *ies, int ie_len, int left)
518 {
519 int len = 0;
520 u8 *pos = NULL;
521
522 /* Make sure there is enough space for the probe request,
523 * two mandatory IEs and the data */
524 left -= 24;
525 if (left < 0)
526 return 0;
527
528 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
529 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
530 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
531 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
532 frame->seq_ctrl = 0;
533
534 len += 24;
535
536 /* ...next IE... */
537 pos = &frame->u.probe_req.variable[0];
538
539 /* fill in our indirect SSID IE */
540 left -= 2;
541 if (left < 0)
542 return 0;
543 *pos++ = WLAN_EID_SSID;
544 *pos++ = 0;
545
546 len += 2;
547
548 if (WARN_ON(left < ie_len))
549 return len;
550
551 memcpy(pos, ies, ie_len);
552 len += ie_len;
553 left -= ie_len;
554
555 return (u16)len;
556 }
557 EXPORT_SYMBOL(iwl_fill_probe_req);
558
559 static void iwl_bg_request_scan(struct work_struct *data)
560 {
561 struct iwl_priv *priv =
562 container_of(data, struct iwl_priv, request_scan);
563 struct iwl_host_cmd cmd = {
564 .id = REPLY_SCAN_CMD,
565 .len = sizeof(struct iwl_scan_cmd),
566 .flags = CMD_SIZE_HUGE,
567 };
568 struct iwl_scan_cmd *scan;
569 struct ieee80211_conf *conf = NULL;
570 int ret = 0;
571 u32 rate_flags = 0;
572 u16 cmd_len;
573 u16 rx_chain = 0;
574 enum ieee80211_band band;
575 u8 n_probes = 0;
576 u8 rx_ant = priv->hw_params.valid_rx_ant;
577 u8 rate;
578 bool is_active = false;
579 int chan_mod;
580
581 conf = ieee80211_get_hw_conf(priv->hw);
582
583 mutex_lock(&priv->mutex);
584
585 cancel_delayed_work(&priv->scan_check);
586
587 if (!iwl_is_ready(priv)) {
588 IWL_WARN(priv, "request scan called when driver not ready.\n");
589 goto done;
590 }
591
592 /* Make sure the scan wasn't canceled before this queued work
593 * was given the chance to run... */
594 if (!test_bit(STATUS_SCANNING, &priv->status))
595 goto done;
596
597 /* This should never be called or scheduled if there is currently
598 * a scan active in the hardware. */
599 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
600 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
601 "Ignoring second request.\n");
602 ret = -EIO;
603 goto done;
604 }
605
606 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
607 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
608 goto done;
609 }
610
611 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
612 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
613 goto done;
614 }
615
616 if (iwl_is_rfkill(priv)) {
617 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
618 goto done;
619 }
620
621 if (!test_bit(STATUS_READY, &priv->status)) {
622 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
623 goto done;
624 }
625
626 if (!priv->scan_bands) {
627 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
628 goto done;
629 }
630
631 if (!priv->scan) {
632 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
633 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
634 if (!priv->scan) {
635 ret = -ENOMEM;
636 goto done;
637 }
638 }
639 scan = priv->scan;
640 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
641
642 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
643 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
644
645 if (iwl_is_associated(priv)) {
646 u16 interval = 0;
647 u32 extra;
648 u32 suspend_time = 100;
649 u32 scan_suspend_time = 100;
650 unsigned long flags;
651
652 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
653
654 spin_lock_irqsave(&priv->lock, flags);
655 interval = priv->beacon_int;
656 spin_unlock_irqrestore(&priv->lock, flags);
657
658 scan->suspend_time = 0;
659 scan->max_out_time = cpu_to_le32(200 * 1024);
660 if (!interval)
661 interval = suspend_time;
662
663 extra = (suspend_time / interval) << 22;
664 scan_suspend_time = (extra |
665 ((suspend_time % interval) * 1024));
666 scan->suspend_time = cpu_to_le32(scan_suspend_time);
667 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
668 scan_suspend_time, interval);
669 }
670
671 if (priv->scan_request->n_ssids) {
672 int i, p = 0;
673 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
674 for (i = 0; i < priv->scan_request->n_ssids; i++) {
675 /* always does wildcard anyway */
676 if (!priv->scan_request->ssids[i].ssid_len)
677 continue;
678 scan->direct_scan[p].id = WLAN_EID_SSID;
679 scan->direct_scan[p].len =
680 priv->scan_request->ssids[i].ssid_len;
681 memcpy(scan->direct_scan[p].ssid,
682 priv->scan_request->ssids[i].ssid,
683 priv->scan_request->ssids[i].ssid_len);
684 n_probes++;
685 p++;
686 }
687 is_active = true;
688 } else
689 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
690
691 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
692 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
693 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
694
695
696 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
697 band = IEEE80211_BAND_2GHZ;
698 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
699 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
700 >> RXON_FLG_CHANNEL_MODE_POS;
701 if (chan_mod == CHANNEL_MODE_PURE_40) {
702 rate = IWL_RATE_6M_PLCP;
703 } else {
704 rate = IWL_RATE_1M_PLCP;
705 rate_flags = RATE_MCS_CCK_MSK;
706 }
707 scan->good_CRC_th = 0;
708 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
709 band = IEEE80211_BAND_5GHZ;
710 rate = IWL_RATE_6M_PLCP;
711 /*
712 * If active scaning is requested but a certain channel
713 * is marked passive, we can do active scanning if we
714 * detect transmissions.
715 */
716 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0;
717
718 /* Force use of chains B and C (0x6) for scan Rx for 4965
719 * Avoid A (0x1) because of its off-channel reception on A-band.
720 */
721 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
722 rx_ant = ANT_BC;
723 } else {
724 IWL_WARN(priv, "Invalid scan band count\n");
725 goto done;
726 }
727
728 priv->scan_tx_ant[band] =
729 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
730 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
731 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
732
733 /* MIMO is not used here, but value is required */
734 rx_chain |= ANT_ABC << RXON_RX_CHAIN_VALID_POS;
735 rx_chain |= ANT_ABC << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
736 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
737 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
738 scan->rx_chain = cpu_to_le16(rx_chain);
739 cmd_len = iwl_fill_probe_req(priv,
740 (struct ieee80211_mgmt *)scan->data,
741 priv->scan_request->ie,
742 priv->scan_request->ie_len,
743 IWL_MAX_SCAN_SIZE - sizeof(*scan));
744
745 scan->tx_cmd.len = cpu_to_le16(cmd_len);
746
747 if (iwl_is_monitor_mode(priv))
748 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
749
750 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
751 RXON_FILTER_BCON_AWARE_MSK);
752
753 scan->channel_count =
754 iwl_get_channels_for_scan(priv, band, is_active, n_probes,
755 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
756
757 if (scan->channel_count == 0) {
758 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
759 goto done;
760 }
761
762 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
763 scan->channel_count * sizeof(struct iwl_scan_channel);
764 cmd.data = scan;
765 scan->len = cpu_to_le16(cmd.len);
766
767 set_bit(STATUS_SCAN_HW, &priv->status);
768 ret = iwl_send_cmd_sync(priv, &cmd);
769 if (ret)
770 goto done;
771
772 queue_delayed_work(priv->workqueue, &priv->scan_check,
773 IWL_SCAN_CHECK_WATCHDOG);
774
775 mutex_unlock(&priv->mutex);
776 return;
777
778 done:
779 /* Cannot perform scan. Make sure we clear scanning
780 * bits from status so next scan request can be performed.
781 * If we don't clear scanning status bit here all next scan
782 * will fail
783 */
784 clear_bit(STATUS_SCAN_HW, &priv->status);
785 clear_bit(STATUS_SCANNING, &priv->status);
786 /* inform mac80211 scan aborted */
787 queue_work(priv->workqueue, &priv->scan_completed);
788 mutex_unlock(&priv->mutex);
789 }
790
791 void iwl_bg_abort_scan(struct work_struct *work)
792 {
793 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
794
795 if (!test_bit(STATUS_READY, &priv->status) ||
796 !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
797 return;
798
799 cancel_delayed_work(&priv->scan_check);
800
801 mutex_lock(&priv->mutex);
802 if (test_bit(STATUS_SCAN_ABORTING, &priv->status))
803 iwl_send_scan_abort(priv);
804 mutex_unlock(&priv->mutex);
805 }
806 EXPORT_SYMBOL(iwl_bg_abort_scan);
807
808 void iwl_bg_scan_completed(struct work_struct *work)
809 {
810 struct iwl_priv *priv =
811 container_of(work, struct iwl_priv, scan_completed);
812
813 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
814
815 cancel_delayed_work(&priv->scan_check);
816
817 ieee80211_scan_completed(priv->hw, false);
818
819 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
820 return;
821
822 /* Since setting the TXPOWER may have been deferred while
823 * performing the scan, fire one off */
824 mutex_lock(&priv->mutex);
825 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
826 mutex_unlock(&priv->mutex);
827 }
828 EXPORT_SYMBOL(iwl_bg_scan_completed);
829
830 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
831 {
832 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
833 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
834 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
835 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
836 }
837 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
838
Linux ARM platform port for MOXA ART SoC