Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
1 /******************************************************************************
2  *
3  * GPL LICENSE SUMMARY
4  *
5  * Copyright(c) 2008 - 2010 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/mac80211.h>
31
32 #include "iwl-eeprom.h"
33 #include "iwl-dev.h"
34 #include "iwl-core.h"
35 #include "iwl-sta.h"
36 #include "iwl-io.h"
37 #include "iwl-helpers.h"
38
39 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
40  * sending probe req.  This should be set long enough to hear probe responses
41  * from more than one AP.  */
42 #define IWL_ACTIVE_DWELL_TIME_24    (30)       /* all times in msec */
43 #define IWL_ACTIVE_DWELL_TIME_52    (20)
44
45 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
46 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
47
48 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
49  * Must be set longer than active dwell time.
50  * For the most reliable scan, set > AP beacon interval (typically 100msec). */
51 #define IWL_PASSIVE_DWELL_TIME_24   (20)       /* all times in msec */
52 #define IWL_PASSIVE_DWELL_TIME_52   (10)
53 #define IWL_PASSIVE_DWELL_BASE      (100)
54 #define IWL_CHANNEL_TUNE_TIME       5
55
56
57
58 /**
59  * iwl_scan_cancel - Cancel any currently executing HW scan
60  *
61  * NOTE: priv->mutex is not required before calling this function
62  */
63 int iwl_scan_cancel(struct iwl_priv *priv)
64 {
65         if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
66                 clear_bit(STATUS_SCANNING, &priv->status);
67                 return 0;
68         }
69
70         if (test_bit(STATUS_SCANNING, &priv->status)) {
71                 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
72                         IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
73                         set_bit(STATUS_SCAN_ABORTING, &priv->status);
74                         queue_work(priv->workqueue, &priv->abort_scan);
75
76                 } else
77                         IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
78
79                 return test_bit(STATUS_SCANNING, &priv->status);
80         }
81
82         return 0;
83 }
84 EXPORT_SYMBOL(iwl_scan_cancel);
85 /**
86  * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
87  * @ms: amount of time to wait (in milliseconds) for scan to abort
88  *
89  * NOTE: priv->mutex must be held before calling this function
90  */
91 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
92 {
93         unsigned long now = jiffies;
94         int ret;
95
96         ret = iwl_scan_cancel(priv);
97         if (ret && ms) {
98                 mutex_unlock(&priv->mutex);
99                 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
100                                 test_bit(STATUS_SCANNING, &priv->status))
101                         msleep(1);
102                 mutex_lock(&priv->mutex);
103
104                 return test_bit(STATUS_SCANNING, &priv->status);
105         }
106
107         return ret;
108 }
109 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
110
111 static int iwl_send_scan_abort(struct iwl_priv *priv)
112 {
113         int ret = 0;
114         struct iwl_rx_packet *pkt;
115         struct iwl_host_cmd cmd = {
116                 .id = REPLY_SCAN_ABORT_CMD,
117                 .flags = CMD_WANT_SKB,
118         };
119
120         /* If there isn't a scan actively going on in the hardware
121          * then we are in between scan bands and not actually
122          * actively scanning, so don't send the abort command */
123         if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
124                 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
125                 return 0;
126         }
127
128         ret = iwl_send_cmd_sync(priv, &cmd);
129         if (ret) {
130                 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
131                 return ret;
132         }
133
134         pkt = (struct iwl_rx_packet *)cmd.reply_page;
135         if (pkt->u.status != CAN_ABORT_STATUS) {
136                 /* The scan abort will return 1 for success or
137                  * 2 for "failure".  A failure condition can be
138                  * due to simply not being in an active scan which
139                  * can occur if we send the scan abort before we
140                  * the microcode has notified us that a scan is
141                  * completed. */
142                 IWL_DEBUG_INFO(priv, "SCAN_ABORT returned %d.\n", pkt->u.status);
143                 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
144                 clear_bit(STATUS_SCAN_HW, &priv->status);
145         }
146
147         iwl_free_pages(priv, cmd.reply_page);
148
149         return ret;
150 }
151
152 /* Service response to REPLY_SCAN_CMD (0x80) */
153 static void iwl_rx_reply_scan(struct iwl_priv *priv,
154                               struct iwl_rx_mem_buffer *rxb)
155 {
156 #ifdef CONFIG_IWLWIFI_DEBUG
157         struct iwl_rx_packet *pkt = rxb_addr(rxb);
158         struct iwl_scanreq_notification *notif =
159             (struct iwl_scanreq_notification *)pkt->u.raw;
160
161         IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
162 #endif
163 }
164
165 /* Service SCAN_START_NOTIFICATION (0x82) */
166 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
167                                     struct iwl_rx_mem_buffer *rxb)
168 {
169         struct iwl_rx_packet *pkt = rxb_addr(rxb);
170         struct iwl_scanstart_notification *notif =
171             (struct iwl_scanstart_notification *)pkt->u.raw;
172         priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
173         IWL_DEBUG_SCAN(priv, "Scan start: "
174                        "%d [802.11%s] "
175                        "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
176                        notif->channel,
177                        notif->band ? "bg" : "a",
178                        le32_to_cpu(notif->tsf_high),
179                        le32_to_cpu(notif->tsf_low),
180                        notif->status, notif->beacon_timer);
181 }
182
183 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
184 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
185                                       struct iwl_rx_mem_buffer *rxb)
186 {
187 #ifdef CONFIG_IWLWIFI_DEBUG
188         struct iwl_rx_packet *pkt = rxb_addr(rxb);
189         struct iwl_scanresults_notification *notif =
190             (struct iwl_scanresults_notification *)pkt->u.raw;
191
192         IWL_DEBUG_SCAN(priv, "Scan ch.res: "
193                        "%d [802.11%s] "
194                        "(TSF: 0x%08X:%08X) - %d "
195                        "elapsed=%lu usec\n",
196                        notif->channel,
197                        notif->band ? "bg" : "a",
198                        le32_to_cpu(notif->tsf_high),
199                        le32_to_cpu(notif->tsf_low),
200                        le32_to_cpu(notif->statistics[0]),
201                        le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
202 #endif
203
204         if (!priv->is_internal_short_scan)
205                 priv->next_scan_jiffies = 0;
206 }
207
208 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
209 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
210                                        struct iwl_rx_mem_buffer *rxb)
211 {
212 #ifdef CONFIG_IWLWIFI_DEBUG
213         struct iwl_rx_packet *pkt = rxb_addr(rxb);
214         struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
215
216         IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
217                        scan_notif->scanned_channels,
218                        scan_notif->tsf_low,
219                        scan_notif->tsf_high, scan_notif->status);
220 #endif
221
222         /* The HW is no longer scanning */
223         clear_bit(STATUS_SCAN_HW, &priv->status);
224
225         IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n",
226                        (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
227                                                 "2.4" : "5.2",
228                        jiffies_to_msecs(elapsed_jiffies
229                                         (priv->scan_pass_start, jiffies)));
230
231         /* Remove this scanned band from the list of pending
232          * bands to scan, band G precedes A in order of scanning
233          * as seen in iwl_bg_request_scan */
234         if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
235                 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
236         else if (priv->scan_bands &  BIT(IEEE80211_BAND_5GHZ))
237                 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
238
239         /* If a request to abort was given, or the scan did not succeed
240          * then we reset the scan state machine and terminate,
241          * re-queuing another scan if one has been requested */
242         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
243                 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
244                 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
245         } else {
246                 /* If there are more bands on this scan pass reschedule */
247                 if (priv->scan_bands)
248                         goto reschedule;
249         }
250
251         if (!priv->is_internal_short_scan)
252                 priv->next_scan_jiffies = 0;
253
254         IWL_DEBUG_INFO(priv, "Setting scan to off\n");
255
256         clear_bit(STATUS_SCANNING, &priv->status);
257
258         IWL_DEBUG_INFO(priv, "Scan took %dms\n",
259                 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
260
261         queue_work(priv->workqueue, &priv->scan_completed);
262
263         return;
264
265 reschedule:
266         priv->scan_pass_start = jiffies;
267         queue_work(priv->workqueue, &priv->request_scan);
268 }
269
270 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
271 {
272         /* scan handlers */
273         priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
274         priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
275         priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
276                                         iwl_rx_scan_results_notif;
277         priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
278                                         iwl_rx_scan_complete_notif;
279 }
280 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
281
282 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
283                                      enum ieee80211_band band,
284                                      u8 n_probes)
285 {
286         if (band == IEEE80211_BAND_5GHZ)
287                 return IWL_ACTIVE_DWELL_TIME_52 +
288                         IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
289         else
290                 return IWL_ACTIVE_DWELL_TIME_24 +
291                         IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
292 }
293 EXPORT_SYMBOL(iwl_get_active_dwell_time);
294
295 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
296                                enum ieee80211_band band)
297 {
298         u16 passive = (band == IEEE80211_BAND_2GHZ) ?
299             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
300             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
301
302         if (iwl_is_associated(priv)) {
303                 /* If we're associated, we clamp the maximum passive
304                  * dwell time to be 98% of the beacon interval (minus
305                  * 2 * channel tune time) */
306                 passive = priv->beacon_int;
307                 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
308                         passive = IWL_PASSIVE_DWELL_BASE;
309                 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
310         }
311
312         return passive;
313 }
314 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
315
316 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
317                                      enum ieee80211_band band,
318                                      struct iwl_scan_channel *scan_ch)
319 {
320         const struct ieee80211_supported_band *sband;
321         const struct iwl_channel_info *ch_info;
322         u16 passive_dwell = 0;
323         u16 active_dwell = 0;
324         int i, added = 0;
325         u16 channel = 0;
326
327         sband = iwl_get_hw_mode(priv, band);
328         if (!sband) {
329                 IWL_ERR(priv, "invalid band\n");
330                 return added;
331         }
332
333         active_dwell = iwl_get_active_dwell_time(priv, band, 0);
334         passive_dwell = iwl_get_passive_dwell_time(priv, band);
335
336         if (passive_dwell <= active_dwell)
337                 passive_dwell = active_dwell + 1;
338
339         /* only scan single channel, good enough to reset the RF */
340         /* pick the first valid not in-use channel */
341         if (band == IEEE80211_BAND_5GHZ) {
342                 for (i = 14; i < priv->channel_count; i++) {
343                         if (priv->channel_info[i].channel !=
344                             le16_to_cpu(priv->staging_rxon.channel)) {
345                                 channel = priv->channel_info[i].channel;
346                                 ch_info = iwl_get_channel_info(priv,
347                                         band, channel);
348                                 if (is_channel_valid(ch_info))
349                                         break;
350                         }
351                 }
352         } else {
353                 for (i = 0; i < 14; i++) {
354                         if (priv->channel_info[i].channel !=
355                             le16_to_cpu(priv->staging_rxon.channel)) {
356                                         channel =
357                                                 priv->channel_info[i].channel;
358                                         ch_info = iwl_get_channel_info(priv,
359                                                 band, channel);
360                                         if (is_channel_valid(ch_info))
361                                                 break;
362                         }
363                 }
364         }
365         if (channel) {
366                 scan_ch->channel = cpu_to_le16(channel);
367                 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
368                 scan_ch->active_dwell = cpu_to_le16(active_dwell);
369                 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
370                 /* Set txpower levels to defaults */
371                 scan_ch->dsp_atten = 110;
372                 if (band == IEEE80211_BAND_5GHZ)
373                         scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
374                 else
375                         scan_ch->tx_gain = ((1 << 5) | (5 << 3));
376                 added++;
377         } else
378                 IWL_ERR(priv, "no valid channel found\n");
379         return added;
380 }
381
382 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
383                                      enum ieee80211_band band,
384                                      u8 is_active, u8 n_probes,
385                                      struct iwl_scan_channel *scan_ch)
386 {
387         struct ieee80211_channel *chan;
388         const struct ieee80211_supported_band *sband;
389         const struct iwl_channel_info *ch_info;
390         u16 passive_dwell = 0;
391         u16 active_dwell = 0;
392         int added, i;
393         u16 channel;
394
395         sband = iwl_get_hw_mode(priv, band);
396         if (!sband)
397                 return 0;
398
399         active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
400         passive_dwell = iwl_get_passive_dwell_time(priv, band);
401
402         if (passive_dwell <= active_dwell)
403                 passive_dwell = active_dwell + 1;
404
405         for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
406                 chan = priv->scan_request->channels[i];
407
408                 if (chan->band != band)
409                         continue;
410
411                 channel = ieee80211_frequency_to_channel(chan->center_freq);
412                 scan_ch->channel = cpu_to_le16(channel);
413
414                 ch_info = iwl_get_channel_info(priv, band, channel);
415                 if (!is_channel_valid(ch_info)) {
416                         IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
417                                         channel);
418                         continue;
419                 }
420
421                 if (!is_active || is_channel_passive(ch_info) ||
422                     (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
423                         scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
424                 else
425                         scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
426
427                 if (n_probes)
428                         scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
429
430                 scan_ch->active_dwell = cpu_to_le16(active_dwell);
431                 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
432
433                 /* Set txpower levels to defaults */
434                 scan_ch->dsp_atten = 110;
435
436                 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
437                  * power level:
438                  * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
439                  */
440                 if (band == IEEE80211_BAND_5GHZ)
441                         scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
442                 else
443                         scan_ch->tx_gain = ((1 << 5) | (5 << 3));
444
445                 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
446                                channel, le32_to_cpu(scan_ch->type),
447                                (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
448                                 "ACTIVE" : "PASSIVE",
449                                (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
450                                active_dwell : passive_dwell);
451
452                 scan_ch++;
453                 added++;
454         }
455
456         IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
457         return added;
458 }
459
460 void iwl_init_scan_params(struct iwl_priv *priv)
461 {
462         u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
463         if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
464                 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
465         if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
466                 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
467 }
468 EXPORT_SYMBOL(iwl_init_scan_params);
469
470 static int iwl_scan_initiate(struct iwl_priv *priv)
471 {
472         IWL_DEBUG_INFO(priv, "Starting scan...\n");
473         set_bit(STATUS_SCANNING, &priv->status);
474         priv->is_internal_short_scan = false;
475         priv->scan_start = jiffies;
476         priv->scan_pass_start = priv->scan_start;
477
478         queue_work(priv->workqueue, &priv->request_scan);
479
480         return 0;
481 }
482
483 #define IWL_DELAY_NEXT_SCAN (HZ*2)
484
485 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
486                      struct cfg80211_scan_request *req)
487 {
488         unsigned long flags;
489         struct iwl_priv *priv = hw->priv;
490         int ret, i;
491
492         IWL_DEBUG_MAC80211(priv, "enter\n");
493
494         mutex_lock(&priv->mutex);
495         spin_lock_irqsave(&priv->lock, flags);
496
497         if (!iwl_is_ready_rf(priv)) {
498                 ret = -EIO;
499                 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
500                 goto out_unlock;
501         }
502
503         if (test_bit(STATUS_SCANNING, &priv->status)) {
504                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
505                 ret = -EAGAIN;
506                 goto out_unlock;
507         }
508
509         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
510                 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
511                 ret = -EAGAIN;
512                 goto out_unlock;
513         }
514
515         /* We don't schedule scan within next_scan_jiffies period.
516          * Avoid scanning during possible EAPOL exchange, return
517          * success immediately.
518          */
519         if (priv->next_scan_jiffies &&
520             time_after(priv->next_scan_jiffies, jiffies)) {
521                 IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n");
522                 queue_work(priv->workqueue, &priv->scan_completed);
523                 ret = 0;
524                 goto out_unlock;
525         }
526
527         priv->scan_bands = 0;
528         for (i = 0; i < req->n_channels; i++)
529                 priv->scan_bands |= BIT(req->channels[i]->band);
530
531         priv->scan_request = req;
532
533         ret = iwl_scan_initiate(priv);
534
535         IWL_DEBUG_MAC80211(priv, "leave\n");
536
537 out_unlock:
538         spin_unlock_irqrestore(&priv->lock, flags);
539         mutex_unlock(&priv->mutex);
540
541         return ret;
542 }
543 EXPORT_SYMBOL(iwl_mac_hw_scan);
544
545 /*
546  * internal short scan, this function should only been called while associated.
547  * It will reset and tune the radio to prevent possible RF related problem
548  */
549 int iwl_internal_short_hw_scan(struct iwl_priv *priv)
550 {
551         int ret = 0;
552
553         if (!iwl_is_ready_rf(priv)) {
554                 ret = -EIO;
555                 IWL_DEBUG_SCAN(priv, "not ready or exit pending\n");
556                 goto out;
557         }
558         if (test_bit(STATUS_SCANNING, &priv->status)) {
559                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
560                 ret = -EAGAIN;
561                 goto out;
562         }
563         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
564                 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
565                 ret = -EAGAIN;
566                 goto out;
567         }
568
569         priv->scan_bands = 0;
570         if (priv->band == IEEE80211_BAND_5GHZ)
571                 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
572         else
573                 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
574
575         IWL_DEBUG_SCAN(priv, "Start internal short scan...\n");
576         set_bit(STATUS_SCANNING, &priv->status);
577         priv->is_internal_short_scan = true;
578         queue_work(priv->workqueue, &priv->request_scan);
579
580 out:
581         return ret;
582 }
583 EXPORT_SYMBOL(iwl_internal_short_hw_scan);
584
585 #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
586
587 void iwl_bg_scan_check(struct work_struct *data)
588 {
589         struct iwl_priv *priv =
590             container_of(data, struct iwl_priv, scan_check.work);
591
592         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
593                 return;
594
595         mutex_lock(&priv->mutex);
596         if (test_bit(STATUS_SCANNING, &priv->status) ||
597             test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
598                 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
599                         "adapter (%dms)\n",
600                         jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
601
602                 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
603                         iwl_send_scan_abort(priv);
604         }
605         mutex_unlock(&priv->mutex);
606 }
607 EXPORT_SYMBOL(iwl_bg_scan_check);
608
609 /**
610  * iwl_fill_probe_req - fill in all required fields and IE for probe request
611  */
612
613 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
614                        const u8 *ies, int ie_len, int left)
615 {
616         int len = 0;
617         u8 *pos = NULL;
618
619         /* Make sure there is enough space for the probe request,
620          * two mandatory IEs and the data */
621         left -= 24;
622         if (left < 0)
623                 return 0;
624
625         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
626         memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
627         memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
628         memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
629         frame->seq_ctrl = 0;
630
631         len += 24;
632
633         /* ...next IE... */
634         pos = &frame->u.probe_req.variable[0];
635
636         /* fill in our indirect SSID IE */
637         left -= 2;
638         if (left < 0)
639                 return 0;
640         *pos++ = WLAN_EID_SSID;
641         *pos++ = 0;
642
643         len += 2;
644
645         if (WARN_ON(left < ie_len))
646                 return len;
647
648         if (ies)
649                 memcpy(pos, ies, ie_len);
650         len += ie_len;
651         left -= ie_len;
652
653         return (u16)len;
654 }
655 EXPORT_SYMBOL(iwl_fill_probe_req);
656
657 static void iwl_bg_request_scan(struct work_struct *data)
658 {
659         struct iwl_priv *priv =
660             container_of(data, struct iwl_priv, request_scan);
661         struct iwl_host_cmd cmd = {
662                 .id = REPLY_SCAN_CMD,
663                 .len = sizeof(struct iwl_scan_cmd),
664                 .flags = CMD_SIZE_HUGE,
665         };
666         struct iwl_scan_cmd *scan;
667         struct ieee80211_conf *conf = NULL;
668         int ret = 0;
669         u32 rate_flags = 0;
670         u16 cmd_len;
671         u16 rx_chain = 0;
672         enum ieee80211_band band;
673         u8 n_probes = 0;
674         u8 rx_ant = priv->hw_params.valid_rx_ant;
675         u8 rate;
676         bool is_active = false;
677         int  chan_mod;
678         u8 active_chains;
679
680         conf = ieee80211_get_hw_conf(priv->hw);
681
682         mutex_lock(&priv->mutex);
683
684         cancel_delayed_work(&priv->scan_check);
685
686         if (!iwl_is_ready(priv)) {
687                 IWL_WARN(priv, "request scan called when driver not ready.\n");
688                 goto done;
689         }
690
691         /* Make sure the scan wasn't canceled before this queued work
692          * was given the chance to run... */
693         if (!test_bit(STATUS_SCANNING, &priv->status))
694                 goto done;
695
696         /* This should never be called or scheduled if there is currently
697          * a scan active in the hardware. */
698         if (test_bit(STATUS_SCAN_HW, &priv->status)) {
699                 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
700                                "Ignoring second request.\n");
701                 ret = -EIO;
702                 goto done;
703         }
704
705         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
706                 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
707                 goto done;
708         }
709
710         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
711                 IWL_DEBUG_HC(priv, "Scan request while abort pending.  Queuing.\n");
712                 goto done;
713         }
714
715         if (iwl_is_rfkill(priv)) {
716                 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
717                 goto done;
718         }
719
720         if (!test_bit(STATUS_READY, &priv->status)) {
721                 IWL_DEBUG_HC(priv, "Scan request while uninitialized.  Queuing.\n");
722                 goto done;
723         }
724
725         if (!priv->scan_bands) {
726                 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
727                 goto done;
728         }
729
730         if (!priv->scan) {
731                 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
732                                      IWL_MAX_SCAN_SIZE, GFP_KERNEL);
733                 if (!priv->scan) {
734                         ret = -ENOMEM;
735                         goto done;
736                 }
737         }
738         scan = priv->scan;
739         memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
740
741         scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
742         scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
743
744         if (iwl_is_associated(priv)) {
745                 u16 interval = 0;
746                 u32 extra;
747                 u32 suspend_time = 100;
748                 u32 scan_suspend_time = 100;
749                 unsigned long flags;
750
751                 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
752                 spin_lock_irqsave(&priv->lock, flags);
753                 interval = priv->beacon_int;
754                 spin_unlock_irqrestore(&priv->lock, flags);
755
756                 scan->suspend_time = 0;
757                 scan->max_out_time = cpu_to_le32(200 * 1024);
758                 if (!interval)
759                         interval = suspend_time;
760
761                 extra = (suspend_time / interval) << 22;
762                 scan_suspend_time = (extra |
763                     ((suspend_time % interval) * 1024));
764                 scan->suspend_time = cpu_to_le32(scan_suspend_time);
765                 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
766                                scan_suspend_time, interval);
767         }
768
769         if (priv->is_internal_short_scan) {
770                 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
771         } else if (priv->scan_request->n_ssids) {
772                 int i, p = 0;
773                 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
774                 for (i = 0; i < priv->scan_request->n_ssids; i++) {
775                         /* always does wildcard anyway */
776                         if (!priv->scan_request->ssids[i].ssid_len)
777                                 continue;
778                         scan->direct_scan[p].id = WLAN_EID_SSID;
779                         scan->direct_scan[p].len =
780                                 priv->scan_request->ssids[i].ssid_len;
781                         memcpy(scan->direct_scan[p].ssid,
782                                priv->scan_request->ssids[i].ssid,
783                                priv->scan_request->ssids[i].ssid_len);
784                         n_probes++;
785                         p++;
786                 }
787                 is_active = true;
788         } else
789                 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
790
791         scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
792         scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
793         scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
794
795
796         if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
797                 band = IEEE80211_BAND_2GHZ;
798                 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
799                 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
800                                        >> RXON_FLG_CHANNEL_MODE_POS;
801                 if (chan_mod == CHANNEL_MODE_PURE_40) {
802                         rate = IWL_RATE_6M_PLCP;
803                 } else {
804                         rate = IWL_RATE_1M_PLCP;
805                         rate_flags = RATE_MCS_CCK_MSK;
806                 }
807                 scan->good_CRC_th = 0;
808         } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
809                 band = IEEE80211_BAND_5GHZ;
810                 rate = IWL_RATE_6M_PLCP;
811                 /*
812                  * If active scaning is requested but a certain channel
813                  * is marked passive, we can do active scanning if we
814                  * detect transmissions.
815                  */
816                 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0;
817
818                 /* Force use of chains B and C (0x6) for scan Rx for 4965
819                  * Avoid A (0x1) because of its off-channel reception on A-band.
820                  */
821                 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
822                         rx_ant = ANT_BC;
823         } else {
824                 IWL_WARN(priv, "Invalid scan band count\n");
825                 goto done;
826         }
827
828         priv->scan_tx_ant[band] =
829                          iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
830         rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
831         scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
832
833         /* In power save mode use one chain, otherwise use all chains */
834         if (test_bit(STATUS_POWER_PMI, &priv->status)) {
835                 /* rx_ant has been set to all valid chains previously */
836                 active_chains = rx_ant &
837                                 ((u8)(priv->chain_noise_data.active_chains));
838                 if (!active_chains)
839                         active_chains = rx_ant;
840
841                 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
842                                 priv->chain_noise_data.active_chains);
843
844                 rx_ant = first_antenna(active_chains);
845         }
846         /* MIMO is not used here, but value is required */
847         rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
848         rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
849         rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
850         rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
851         scan->rx_chain = cpu_to_le16(rx_chain);
852         if (!priv->is_internal_short_scan) {
853                 cmd_len = iwl_fill_probe_req(priv,
854                                         (struct ieee80211_mgmt *)scan->data,
855                                         priv->scan_request->ie,
856                                         priv->scan_request->ie_len,
857                                         IWL_MAX_SCAN_SIZE - sizeof(*scan));
858         } else {
859                 cmd_len = iwl_fill_probe_req(priv,
860                                         (struct ieee80211_mgmt *)scan->data,
861                                         NULL, 0,
862                                         IWL_MAX_SCAN_SIZE - sizeof(*scan));
863
864         }
865         scan->tx_cmd.len = cpu_to_le16(cmd_len);
866         if (iwl_is_monitor_mode(priv))
867                 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
868
869         scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
870                                RXON_FILTER_BCON_AWARE_MSK);
871
872         if (priv->is_internal_short_scan) {
873                 scan->channel_count =
874                         iwl_get_single_channel_for_scan(priv, band,
875                                 (void *)&scan->data[le16_to_cpu(
876                                 scan->tx_cmd.len)]);
877         } else {
878                 scan->channel_count =
879                         iwl_get_channels_for_scan(priv, band,
880                                 is_active, n_probes,
881                                 (void *)&scan->data[le16_to_cpu(
882                                 scan->tx_cmd.len)]);
883         }
884         if (scan->channel_count == 0) {
885                 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
886                 goto done;
887         }
888
889         cmd.len += le16_to_cpu(scan->tx_cmd.len) +
890             scan->channel_count * sizeof(struct iwl_scan_channel);
891         cmd.data = scan;
892         scan->len = cpu_to_le16(cmd.len);
893
894         set_bit(STATUS_SCAN_HW, &priv->status);
895         ret = iwl_send_cmd_sync(priv, &cmd);
896         if (ret)
897                 goto done;
898
899         queue_delayed_work(priv->workqueue, &priv->scan_check,
900                            IWL_SCAN_CHECK_WATCHDOG);
901
902         mutex_unlock(&priv->mutex);
903         return;
904
905  done:
906         /* Cannot perform scan. Make sure we clear scanning
907         * bits from status so next scan request can be performed.
908         * If we don't clear scanning status bit here all next scan
909         * will fail
910         */
911         clear_bit(STATUS_SCAN_HW, &priv->status);
912         clear_bit(STATUS_SCANNING, &priv->status);
913         /* inform mac80211 scan aborted */
914         queue_work(priv->workqueue, &priv->scan_completed);
915         mutex_unlock(&priv->mutex);
916 }
917
918 void iwl_bg_abort_scan(struct work_struct *work)
919 {
920         struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
921
922         if (!test_bit(STATUS_READY, &priv->status) ||
923             !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
924                 return;
925
926         mutex_lock(&priv->mutex);
927
928         set_bit(STATUS_SCAN_ABORTING, &priv->status);
929         iwl_send_scan_abort(priv);
930
931         mutex_unlock(&priv->mutex);
932 }
933 EXPORT_SYMBOL(iwl_bg_abort_scan);
934
935 void iwl_bg_scan_completed(struct work_struct *work)
936 {
937         struct iwl_priv *priv =
938             container_of(work, struct iwl_priv, scan_completed);
939
940         IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
941
942         cancel_delayed_work(&priv->scan_check);
943
944         if (!priv->is_internal_short_scan)
945                 ieee80211_scan_completed(priv->hw, false);
946         else {
947                 priv->is_internal_short_scan = false;
948                 IWL_DEBUG_SCAN(priv, "internal short scan completed\n");
949         }
950
951         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
952                 return;
953
954         /* Since setting the TXPOWER may have been deferred while
955          * performing the scan, fire one off */
956         mutex_lock(&priv->mutex);
957         iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
958         mutex_unlock(&priv->mutex);
959 }
960 EXPORT_SYMBOL(iwl_bg_scan_completed);
961
962 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
963 {
964         INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
965         INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
966         INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
967         INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
968 }
969 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
970