Merge branch 'topic/sc6000' into for-linus
[linux-2.6] / drivers / net / wireless / iwlwifi / iwl-scan.c
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 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                 .meta.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.meta.u.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.meta.u.skb);
150
151         return ret;
152 }
153 EXPORT_SYMBOL(iwl_send_scan_abort);
154
155 /* Service response to REPLY_SCAN_CMD (0x80) */
156 static void iwl_rx_reply_scan(struct iwl_priv *priv,
157                               struct iwl_rx_mem_buffer *rxb)
158 {
159 #ifdef CONFIG_IWLWIFI_DEBUG
160         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
161         struct iwl_scanreq_notification *notif =
162             (struct iwl_scanreq_notification *)pkt->u.raw;
163
164         IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
165 #endif
166 }
167
168 /* Service SCAN_START_NOTIFICATION (0x82) */
169 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
170                                     struct iwl_rx_mem_buffer *rxb)
171 {
172         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
173         struct iwl_scanstart_notification *notif =
174             (struct iwl_scanstart_notification *)pkt->u.raw;
175         priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
176         IWL_DEBUG_SCAN(priv, "Scan start: "
177                        "%d [802.11%s] "
178                        "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
179                        notif->channel,
180                        notif->band ? "bg" : "a",
181                        le32_to_cpu(notif->tsf_high),
182                        le32_to_cpu(notif->tsf_low),
183                        notif->status, notif->beacon_timer);
184 }
185
186 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
187 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
188                                       struct iwl_rx_mem_buffer *rxb)
189 {
190 #ifdef CONFIG_IWLWIFI_DEBUG
191         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
192         struct iwl_scanresults_notification *notif =
193             (struct iwl_scanresults_notification *)pkt->u.raw;
194
195         IWL_DEBUG_SCAN(priv, "Scan ch.res: "
196                        "%d [802.11%s] "
197                        "(TSF: 0x%08X:%08X) - %d "
198                        "elapsed=%lu usec (%dms since last)\n",
199                        notif->channel,
200                        notif->band ? "bg" : "a",
201                        le32_to_cpu(notif->tsf_high),
202                        le32_to_cpu(notif->tsf_low),
203                        le32_to_cpu(notif->statistics[0]),
204                        le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf,
205                        jiffies_to_msecs(elapsed_jiffies
206                                         (priv->last_scan_jiffies, jiffies)));
207 #endif
208
209         priv->last_scan_jiffies = jiffies;
210         priv->next_scan_jiffies = 0;
211 }
212
213 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
214 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
215                                        struct iwl_rx_mem_buffer *rxb)
216 {
217 #ifdef CONFIG_IWLWIFI_DEBUG
218         struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
219         struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
220
221         IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
222                        scan_notif->scanned_channels,
223                        scan_notif->tsf_low,
224                        scan_notif->tsf_high, scan_notif->status);
225 #endif
226
227         /* The HW is no longer scanning */
228         clear_bit(STATUS_SCAN_HW, &priv->status);
229
230         IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n",
231                        (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
232                                                 "2.4" : "5.2",
233                        jiffies_to_msecs(elapsed_jiffies
234                                         (priv->scan_pass_start, jiffies)));
235
236         /* Remove this scanned band from the list of pending
237          * bands to scan, band G precedes A in order of scanning
238          * as seen in iwl_bg_request_scan */
239         if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
240                 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
241         else if (priv->scan_bands &  BIT(IEEE80211_BAND_5GHZ))
242                 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
243
244         /* If a request to abort was given, or the scan did not succeed
245          * then we reset the scan state machine and terminate,
246          * re-queuing another scan if one has been requested */
247         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
248                 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
249                 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
250         } else {
251                 /* If there are more bands on this scan pass reschedule */
252                 if (priv->scan_bands)
253                         goto reschedule;
254         }
255
256         priv->last_scan_jiffies = jiffies;
257         priv->next_scan_jiffies = 0;
258         IWL_DEBUG_INFO(priv, "Setting scan to off\n");
259
260         clear_bit(STATUS_SCANNING, &priv->status);
261
262         IWL_DEBUG_INFO(priv, "Scan took %dms\n",
263                 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
264
265         queue_work(priv->workqueue, &priv->scan_completed);
266
267         return;
268
269 reschedule:
270         priv->scan_pass_start = jiffies;
271         queue_work(priv->workqueue, &priv->request_scan);
272 }
273
274 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
275 {
276         /* scan handlers */
277         priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
278         priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
279         priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
280                                         iwl_rx_scan_results_notif;
281         priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
282                                         iwl_rx_scan_complete_notif;
283 }
284 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
285
286 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
287                                      enum ieee80211_band band,
288                                      u8 n_probes)
289 {
290         if (band == IEEE80211_BAND_5GHZ)
291                 return IWL_ACTIVE_DWELL_TIME_52 +
292                         IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
293         else
294                 return IWL_ACTIVE_DWELL_TIME_24 +
295                         IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
296 }
297 EXPORT_SYMBOL(iwl_get_active_dwell_time);
298
299 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
300                                enum ieee80211_band band)
301 {
302         u16 passive = (band == IEEE80211_BAND_2GHZ) ?
303             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
304             IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
305
306         if (iwl_is_associated(priv)) {
307                 /* If we're associated, we clamp the maximum passive
308                  * dwell time to be 98% of the beacon interval (minus
309                  * 2 * channel tune time) */
310                 passive = priv->beacon_int;
311                 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
312                         passive = IWL_PASSIVE_DWELL_BASE;
313                 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
314         }
315
316         return passive;
317 }
318 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
319
320 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
321                                      enum ieee80211_band band,
322                                      u8 is_active, u8 n_probes,
323                                      struct iwl_scan_channel *scan_ch)
324 {
325         const struct ieee80211_channel *channels = NULL;
326         const struct ieee80211_supported_band *sband;
327         const struct iwl_channel_info *ch_info;
328         u16 passive_dwell = 0;
329         u16 active_dwell = 0;
330         int added, i;
331         u16 channel;
332
333         sband = iwl_get_hw_mode(priv, band);
334         if (!sband)
335                 return 0;
336
337         channels = sband->channels;
338
339         active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
340         passive_dwell = iwl_get_passive_dwell_time(priv, band);
341
342         if (passive_dwell <= active_dwell)
343                 passive_dwell = active_dwell + 1;
344
345         for (i = 0, added = 0; i < sband->n_channels; i++) {
346                 if (channels[i].flags & IEEE80211_CHAN_DISABLED)
347                         continue;
348
349                 channel =
350                         ieee80211_frequency_to_channel(channels[i].center_freq);
351                 scan_ch->channel = cpu_to_le16(channel);
352
353                 ch_info = iwl_get_channel_info(priv, band, channel);
354                 if (!is_channel_valid(ch_info)) {
355                         IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
356                                         channel);
357                         continue;
358                 }
359
360                 if (!is_active || is_channel_passive(ch_info) ||
361                     (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
362                         scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
363                 else
364                         scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
365
366                 if (n_probes)
367                         scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
368
369                 scan_ch->active_dwell = cpu_to_le16(active_dwell);
370                 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
371
372                 /* Set txpower levels to defaults */
373                 scan_ch->dsp_atten = 110;
374
375                 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
376                  * power level:
377                  * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
378                  */
379                 if (band == IEEE80211_BAND_5GHZ)
380                         scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
381                 else
382                         scan_ch->tx_gain = ((1 << 5) | (5 << 3));
383
384                 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
385                                channel, le32_to_cpu(scan_ch->type),
386                                (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
387                                 "ACTIVE" : "PASSIVE",
388                                (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
389                                active_dwell : passive_dwell);
390
391                 scan_ch++;
392                 added++;
393         }
394
395         IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
396         return added;
397 }
398
399 void iwl_init_scan_params(struct iwl_priv *priv)
400 {
401         u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
402         if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
403                 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
404         if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
405                 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
406 }
407
408 int iwl_scan_initiate(struct iwl_priv *priv)
409 {
410         if (!iwl_is_ready_rf(priv)) {
411                 IWL_DEBUG_SCAN(priv, "Aborting scan due to not ready.\n");
412                 return -EIO;
413         }
414
415         if (test_bit(STATUS_SCANNING, &priv->status)) {
416                 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
417                 return -EAGAIN;
418         }
419
420         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
421                 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
422                 return -EAGAIN;
423         }
424
425         IWL_DEBUG_INFO(priv, "Starting scan...\n");
426         if (priv->cfg->sku & IWL_SKU_G)
427                 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
428         if (priv->cfg->sku & IWL_SKU_A)
429                 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
430         set_bit(STATUS_SCANNING, &priv->status);
431         priv->scan_start = jiffies;
432         priv->scan_pass_start = priv->scan_start;
433
434         queue_work(priv->workqueue, &priv->request_scan);
435
436         return 0;
437 }
438 EXPORT_SYMBOL(iwl_scan_initiate);
439
440 #define IWL_DELAY_NEXT_SCAN (HZ*2)
441
442 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
443                      struct cfg80211_scan_request *req)
444 {
445         unsigned long flags;
446         struct iwl_priv *priv = hw->priv;
447         int ret;
448         u8 *ssid = NULL;
449         size_t ssid_len = 0;
450
451         if (req->n_ssids) {
452                 ssid = req->ssids[0].ssid;
453                 ssid_len = req->ssids[0].ssid_len;
454         }
455
456         IWL_DEBUG_MAC80211(priv, "enter\n");
457
458         mutex_lock(&priv->mutex);
459         spin_lock_irqsave(&priv->lock, flags);
460
461         if (!iwl_is_ready_rf(priv)) {
462                 ret = -EIO;
463                 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
464                 goto out_unlock;
465         }
466
467         /* We don't schedule scan within next_scan_jiffies period.
468          * Avoid scanning during possible EAPOL exchange, return
469          * success immediately.
470          */
471         if (priv->next_scan_jiffies &&
472             time_after(priv->next_scan_jiffies, jiffies)) {
473                 IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n");
474                 queue_work(priv->workqueue, &priv->scan_completed);
475                 ret = 0;
476                 goto out_unlock;
477         }
478
479         /* if we just finished scan ask for delay */
480         if (iwl_is_associated(priv) && priv->last_scan_jiffies &&
481             time_after(priv->last_scan_jiffies + IWL_DELAY_NEXT_SCAN, jiffies)) {
482                 IWL_DEBUG_SCAN(priv, "scan rejected: within previous scan period\n");
483                 queue_work(priv->workqueue, &priv->scan_completed);
484                 ret = 0;
485                 goto out_unlock;
486         }
487
488         if (ssid_len) {
489                 priv->one_direct_scan = 1;
490                 priv->direct_ssid_len =  ssid_len;
491                 memcpy(priv->direct_ssid, ssid, priv->direct_ssid_len);
492         } else {
493                 priv->one_direct_scan = 0;
494         }
495
496         ret = iwl_scan_initiate(priv);
497
498         IWL_DEBUG_MAC80211(priv, "leave\n");
499
500 out_unlock:
501         spin_unlock_irqrestore(&priv->lock, flags);
502         mutex_unlock(&priv->mutex);
503
504         return ret;
505 }
506 EXPORT_SYMBOL(iwl_mac_hw_scan);
507
508 #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
509
510 void iwl_bg_scan_check(struct work_struct *data)
511 {
512         struct iwl_priv *priv =
513             container_of(data, struct iwl_priv, scan_check.work);
514
515         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
516                 return;
517
518         mutex_lock(&priv->mutex);
519         if (test_bit(STATUS_SCANNING, &priv->status) ||
520             test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
521                 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
522                         "adapter (%dms)\n",
523                         jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
524
525                 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
526                         iwl_send_scan_abort(priv);
527         }
528         mutex_unlock(&priv->mutex);
529 }
530 EXPORT_SYMBOL(iwl_bg_scan_check);
531
532 /**
533  * iwl_supported_rate_to_ie - fill in the supported rate in IE field
534  *
535  * return : set the bit for each supported rate insert in ie
536  */
537 static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
538                                     u16 basic_rate, int *left)
539 {
540         u16 ret_rates = 0, bit;
541         int i;
542         u8 *cnt = ie;
543         u8 *rates = ie + 1;
544
545         for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
546                 if (bit & supported_rate) {
547                         ret_rates |= bit;
548                         rates[*cnt] = iwl_rates[i].ieee |
549                                 ((bit & basic_rate) ? 0x80 : 0x00);
550                         (*cnt)++;
551                         (*left)--;
552                         if ((*left <= 0) ||
553                             (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
554                                 break;
555                 }
556         }
557
558         return ret_rates;
559 }
560
561
562 static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
563                              u8 *pos, int *left)
564 {
565         struct ieee80211_ht_cap *ht_cap;
566
567         if (!sband || !sband->ht_cap.ht_supported)
568                 return;
569
570         if (*left < sizeof(struct ieee80211_ht_cap))
571                 return;
572
573         *pos++ = sizeof(struct ieee80211_ht_cap);
574         ht_cap = (struct ieee80211_ht_cap *) pos;
575
576         ht_cap->cap_info = cpu_to_le16(sband->ht_cap.cap);
577         memcpy(&ht_cap->mcs, &sband->ht_cap.mcs, 16);
578         ht_cap->ampdu_params_info =
579                 (sband->ht_cap.ampdu_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) |
580                 ((sband->ht_cap.ampdu_density << 2) &
581                         IEEE80211_HT_AMPDU_PARM_DENSITY);
582         *left -= sizeof(struct ieee80211_ht_cap);
583 }
584
585 /**
586  * iwl_fill_probe_req - fill in all required fields and IE for probe request
587  */
588
589 u16 iwl_fill_probe_req(struct iwl_priv *priv,
590                        enum ieee80211_band band,
591                        struct ieee80211_mgmt *frame,
592                        int left)
593 {
594         int len = 0;
595         u8 *pos = NULL;
596         u16 active_rates, ret_rates, cck_rates, active_rate_basic;
597         const struct ieee80211_supported_band *sband =
598                                                 iwl_get_hw_mode(priv, band);
599
600
601         /* Make sure there is enough space for the probe request,
602          * two mandatory IEs and the data */
603         left -= 24;
604         if (left < 0)
605                 return 0;
606
607         frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
608         memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
609         memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
610         memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
611         frame->seq_ctrl = 0;
612
613         len += 24;
614
615         /* ...next IE... */
616         pos = &frame->u.probe_req.variable[0];
617
618         /* fill in our indirect SSID IE */
619         left -= 2;
620         if (left < 0)
621                 return 0;
622         *pos++ = WLAN_EID_SSID;
623         *pos++ = 0;
624
625         len += 2;
626
627         /* fill in supported rate */
628         left -= 2;
629         if (left < 0)
630                 return 0;
631
632         *pos++ = WLAN_EID_SUPP_RATES;
633         *pos = 0;
634
635         /* exclude 60M rate */
636         active_rates = priv->rates_mask;
637         active_rates &= ~IWL_RATE_60M_MASK;
638
639         active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
640
641         cck_rates = IWL_CCK_RATES_MASK & active_rates;
642         ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
643                                              active_rate_basic, &left);
644         active_rates &= ~ret_rates;
645
646         ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
647                                              active_rate_basic, &left);
648         active_rates &= ~ret_rates;
649
650         len += 2 + *pos;
651         pos += (*pos) + 1;
652
653         if (active_rates == 0)
654                 goto fill_end;
655
656         /* fill in supported extended rate */
657         /* ...next IE... */
658         left -= 2;
659         if (left < 0)
660                 return 0;
661         /* ... fill it in... */
662         *pos++ = WLAN_EID_EXT_SUPP_RATES;
663         *pos = 0;
664         iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left);
665         if (*pos > 0) {
666                 len += 2 + *pos;
667                 pos += (*pos) + 1;
668         } else {
669                 pos--;
670         }
671
672  fill_end:
673
674         left -= 2;
675         if (left < 0)
676                 return 0;
677
678         *pos++ = WLAN_EID_HT_CAPABILITY;
679         *pos = 0;
680         iwl_ht_cap_to_ie(sband, pos, &left);
681         if (*pos > 0)
682                 len += 2 + *pos;
683
684         return (u16)len;
685 }
686 EXPORT_SYMBOL(iwl_fill_probe_req);
687
688 static void iwl_bg_request_scan(struct work_struct *data)
689 {
690         struct iwl_priv *priv =
691             container_of(data, struct iwl_priv, request_scan);
692         struct iwl_host_cmd cmd = {
693                 .id = REPLY_SCAN_CMD,
694                 .len = sizeof(struct iwl_scan_cmd),
695                 .meta.flags = CMD_SIZE_HUGE,
696         };
697         struct iwl_scan_cmd *scan;
698         struct ieee80211_conf *conf = NULL;
699         int ret = 0;
700         u32 rate_flags = 0;
701         u16 cmd_len;
702         enum ieee80211_band band;
703         u8 n_probes = 2;
704         u8 rx_chain = priv->hw_params.valid_rx_ant;
705         u8 rate;
706         DECLARE_SSID_BUF(ssid);
707
708         conf = ieee80211_get_hw_conf(priv->hw);
709
710         mutex_lock(&priv->mutex);
711
712         cancel_delayed_work(&priv->scan_check);
713
714         if (!iwl_is_ready(priv)) {
715                 IWL_WARN(priv, "request scan called when driver not ready.\n");
716                 goto done;
717         }
718
719         /* Make sure the scan wasn't canceled before this queued work
720          * was given the chance to run... */
721         if (!test_bit(STATUS_SCANNING, &priv->status))
722                 goto done;
723
724         /* This should never be called or scheduled if there is currently
725          * a scan active in the hardware. */
726         if (test_bit(STATUS_SCAN_HW, &priv->status)) {
727                 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
728                                "Ignoring second request.\n");
729                 ret = -EIO;
730                 goto done;
731         }
732
733         if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
734                 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
735                 goto done;
736         }
737
738         if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
739                 IWL_DEBUG_HC(priv, "Scan request while abort pending.  Queuing.\n");
740                 goto done;
741         }
742
743         if (iwl_is_rfkill(priv)) {
744                 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
745                 goto done;
746         }
747
748         if (!test_bit(STATUS_READY, &priv->status)) {
749                 IWL_DEBUG_HC(priv, "Scan request while uninitialized.  Queuing.\n");
750                 goto done;
751         }
752
753         if (!priv->scan_bands) {
754                 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
755                 goto done;
756         }
757
758         if (!priv->scan) {
759                 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
760                                      IWL_MAX_SCAN_SIZE, GFP_KERNEL);
761                 if (!priv->scan) {
762                         ret = -ENOMEM;
763                         goto done;
764                 }
765         }
766         scan = priv->scan;
767         memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
768
769         scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
770         scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
771
772         if (iwl_is_associated(priv)) {
773                 u16 interval = 0;
774                 u32 extra;
775                 u32 suspend_time = 100;
776                 u32 scan_suspend_time = 100;
777                 unsigned long flags;
778
779                 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
780
781                 spin_lock_irqsave(&priv->lock, flags);
782                 interval = priv->beacon_int;
783                 spin_unlock_irqrestore(&priv->lock, flags);
784
785                 scan->suspend_time = 0;
786                 scan->max_out_time = cpu_to_le32(200 * 1024);
787                 if (!interval)
788                         interval = suspend_time;
789
790                 extra = (suspend_time / interval) << 22;
791                 scan_suspend_time = (extra |
792                     ((suspend_time % interval) * 1024));
793                 scan->suspend_time = cpu_to_le32(scan_suspend_time);
794                 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
795                                scan_suspend_time, interval);
796         }
797
798         /* We should add the ability for user to lock to PASSIVE ONLY */
799         if (priv->one_direct_scan) {
800                 IWL_DEBUG_SCAN(priv, "Start direct scan for '%s'\n",
801                                 print_ssid(ssid, priv->direct_ssid,
802                                            priv->direct_ssid_len));
803                 scan->direct_scan[0].id = WLAN_EID_SSID;
804                 scan->direct_scan[0].len = priv->direct_ssid_len;
805                 memcpy(scan->direct_scan[0].ssid,
806                        priv->direct_ssid, priv->direct_ssid_len);
807                 n_probes++;
808         } else {
809                 IWL_DEBUG_SCAN(priv, "Start indirect scan.\n");
810         }
811
812         scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
813         scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
814         scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
815
816
817         if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
818                 band = IEEE80211_BAND_2GHZ;
819                 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
820                 if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) {
821                         rate = IWL_RATE_6M_PLCP;
822                 } else {
823                         rate = IWL_RATE_1M_PLCP;
824                         rate_flags = RATE_MCS_CCK_MSK;
825                 }
826                 scan->good_CRC_th = 0;
827         } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
828                 band = IEEE80211_BAND_5GHZ;
829                 rate = IWL_RATE_6M_PLCP;
830                 scan->good_CRC_th = IWL_GOOD_CRC_TH;
831
832                 /* Force use of chains B and C (0x6) for scan Rx for 4965
833                  * Avoid A (0x1) because of its off-channel reception on A-band.
834                  */
835                 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
836                         rx_chain = 0x6;
837         } else {
838                 IWL_WARN(priv, "Invalid scan band count\n");
839                 goto done;
840         }
841
842         priv->scan_tx_ant[band] =
843                          iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
844         rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
845         scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
846
847         /* MIMO is not used here, but value is required */
848         scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK |
849                                 cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
850                                 (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) |
851                                 (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
852
853         cmd_len = iwl_fill_probe_req(priv, band,
854                                      (struct ieee80211_mgmt *)scan->data,
855                                      IWL_MAX_SCAN_SIZE - sizeof(*scan));
856
857         scan->tx_cmd.len = cpu_to_le16(cmd_len);
858
859         if (priv->iw_mode == NL80211_IFTYPE_MONITOR)
860                 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
861
862         scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
863                                RXON_FILTER_BCON_AWARE_MSK);
864
865         scan->channel_count =
866                 iwl_get_channels_for_scan(priv, band, 1, /* active */
867                         n_probes,
868                         (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
869
870         if (scan->channel_count == 0) {
871                 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
872                 goto done;
873         }
874
875         cmd.len += le16_to_cpu(scan->tx_cmd.len) +
876             scan->channel_count * sizeof(struct iwl_scan_channel);
877         cmd.data = scan;
878         scan->len = cpu_to_le16(cmd.len);
879
880         set_bit(STATUS_SCAN_HW, &priv->status);
881         ret = iwl_send_cmd_sync(priv, &cmd);
882         if (ret)
883                 goto done;
884
885         queue_delayed_work(priv->workqueue, &priv->scan_check,
886                            IWL_SCAN_CHECK_WATCHDOG);
887
888         mutex_unlock(&priv->mutex);
889         return;
890
891  done:
892         /* Cannot perform scan. Make sure we clear scanning
893         * bits from status so next scan request can be performed.
894         * If we don't clear scanning status bit here all next scan
895         * will fail
896         */
897         clear_bit(STATUS_SCAN_HW, &priv->status);
898         clear_bit(STATUS_SCANNING, &priv->status);
899         /* inform mac80211 scan aborted */
900         queue_work(priv->workqueue, &priv->scan_completed);
901         mutex_unlock(&priv->mutex);
902 }
903
904 void iwl_bg_abort_scan(struct work_struct *work)
905 {
906         struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
907
908         if (!iwl_is_ready(priv))
909                 return;
910
911         mutex_lock(&priv->mutex);
912
913         set_bit(STATUS_SCAN_ABORTING, &priv->status);
914         iwl_send_scan_abort(priv);
915
916         mutex_unlock(&priv->mutex);
917 }
918 EXPORT_SYMBOL(iwl_bg_abort_scan);
919
920 void iwl_bg_scan_completed(struct work_struct *work)
921 {
922         struct iwl_priv *priv =
923             container_of(work, struct iwl_priv, scan_completed);
924
925         IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
926
927         cancel_delayed_work(&priv->scan_check);
928
929         ieee80211_scan_completed(priv->hw, false);
930
931         if (test_bit(STATUS_EXIT_PENDING, &priv->status))
932                 return;
933
934         /* Since setting the TXPOWER may have been deferred while
935          * performing the scan, fire one off */
936         mutex_lock(&priv->mutex);
937         iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
938         mutex_unlock(&priv->mutex);
939 }
940 EXPORT_SYMBOL(iwl_bg_scan_completed);
941
942 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
943 {
944         INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
945         INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
946         INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
947         INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
948 }
949 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
950