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hwmon: (max6650) Add support for alarms
[deliverable/linux.git] / 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
Linux kernel - Deliverables
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