1 /******************************************************************************
5 * Copyright(c) 2008 - 2009 Intel Corporation. All rights reserved.
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.
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.
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,
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
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>
32 #include "iwl-eeprom.h"
37 #include "iwl-helpers.h"
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)
45 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
46 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
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
59 * iwl_scan_cancel - Cancel any currently executing HW scan
61 * NOTE: priv->mutex is not required before calling this function
63 int iwl_scan_cancel(struct iwl_priv *priv)
65 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
66 clear_bit(STATUS_SCANNING, &priv->status);
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);
77 IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
79 return test_bit(STATUS_SCANNING, &priv->status);
84 EXPORT_SYMBOL(iwl_scan_cancel);
86 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
87 * @ms: amount of time to wait (in milliseconds) for scan to abort
89 * NOTE: priv->mutex must be held before calling this function
91 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
93 unsigned long now = jiffies;
96 ret = iwl_scan_cancel(priv);
98 mutex_unlock(&priv->mutex);
99 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
100 test_bit(STATUS_SCANNING, &priv->status))
102 mutex_lock(&priv->mutex);
104 return test_bit(STATUS_SCANNING, &priv->status);
109 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
111 static int iwl_send_scan_abort(struct iwl_priv *priv)
114 struct iwl_rx_packet *pkt;
115 struct iwl_host_cmd cmd = {
116 .id = REPLY_SCAN_ABORT_CMD,
117 .flags = CMD_WANT_SKB,
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);
128 ret = iwl_send_cmd_sync(priv, &cmd);
130 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
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
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);
147 priv->alloc_rxb_page--;
148 free_pages(cmd.reply_page, priv->hw_params.rx_page_order);
153 /* Service response to REPLY_SCAN_CMD (0x80) */
154 static void iwl_rx_reply_scan(struct iwl_priv *priv,
155 struct iwl_rx_mem_buffer *rxb)
157 #ifdef CONFIG_IWLWIFI_DEBUG
158 struct iwl_rx_packet *pkt = rxb_addr(rxb);
159 struct iwl_scanreq_notification *notif =
160 (struct iwl_scanreq_notification *)pkt->u.raw;
162 IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
166 /* Service SCAN_START_NOTIFICATION (0x82) */
167 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
168 struct iwl_rx_mem_buffer *rxb)
170 struct iwl_rx_packet *pkt = rxb_addr(rxb);
171 struct iwl_scanstart_notification *notif =
172 (struct iwl_scanstart_notification *)pkt->u.raw;
173 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
174 IWL_DEBUG_SCAN(priv, "Scan start: "
176 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
178 notif->band ? "bg" : "a",
179 le32_to_cpu(notif->tsf_high),
180 le32_to_cpu(notif->tsf_low),
181 notif->status, notif->beacon_timer);
184 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
185 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
186 struct iwl_rx_mem_buffer *rxb)
188 #ifdef CONFIG_IWLWIFI_DEBUG
189 struct iwl_rx_packet *pkt = rxb_addr(rxb);
190 struct iwl_scanresults_notification *notif =
191 (struct iwl_scanresults_notification *)pkt->u.raw;
193 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
195 "(TSF: 0x%08X:%08X) - %d "
196 "elapsed=%lu usec (%dms since last)\n",
198 notif->band ? "bg" : "a",
199 le32_to_cpu(notif->tsf_high),
200 le32_to_cpu(notif->tsf_low),
201 le32_to_cpu(notif->statistics[0]),
202 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf,
203 jiffies_to_msecs(elapsed_jiffies
204 (priv->last_scan_jiffies, jiffies)));
207 priv->last_scan_jiffies = jiffies;
208 priv->next_scan_jiffies = 0;
211 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
212 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
213 struct iwl_rx_mem_buffer *rxb)
215 #ifdef CONFIG_IWLWIFI_DEBUG
216 struct iwl_rx_packet *pkt = rxb_addr(rxb);
217 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
219 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
220 scan_notif->scanned_channels,
222 scan_notif->tsf_high, scan_notif->status);
225 /* The HW is no longer scanning */
226 clear_bit(STATUS_SCAN_HW, &priv->status);
228 IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n",
229 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
231 jiffies_to_msecs(elapsed_jiffies
232 (priv->scan_pass_start, jiffies)));
234 /* Remove this scanned band from the list of pending
235 * bands to scan, band G precedes A in order of scanning
236 * as seen in iwl_bg_request_scan */
237 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
238 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
239 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
240 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
242 /* If a request to abort was given, or the scan did not succeed
243 * then we reset the scan state machine and terminate,
244 * re-queuing another scan if one has been requested */
245 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
246 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
247 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
249 /* If there are more bands on this scan pass reschedule */
250 if (priv->scan_bands)
254 priv->last_scan_jiffies = jiffies;
255 priv->next_scan_jiffies = 0;
256 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
258 clear_bit(STATUS_SCANNING, &priv->status);
260 IWL_DEBUG_INFO(priv, "Scan took %dms\n",
261 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
263 queue_work(priv->workqueue, &priv->scan_completed);
268 priv->scan_pass_start = jiffies;
269 queue_work(priv->workqueue, &priv->request_scan);
272 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
275 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
276 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
277 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
278 iwl_rx_scan_results_notif;
279 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
280 iwl_rx_scan_complete_notif;
282 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
284 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
285 enum ieee80211_band band,
288 if (band == IEEE80211_BAND_5GHZ)
289 return IWL_ACTIVE_DWELL_TIME_52 +
290 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
292 return IWL_ACTIVE_DWELL_TIME_24 +
293 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
295 EXPORT_SYMBOL(iwl_get_active_dwell_time);
297 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
298 enum ieee80211_band band)
300 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
301 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
302 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
304 if (iwl_is_associated(priv)) {
305 /* If we're associated, we clamp the maximum passive
306 * dwell time to be 98% of the beacon interval (minus
307 * 2 * channel tune time) */
308 passive = priv->beacon_int;
309 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
310 passive = IWL_PASSIVE_DWELL_BASE;
311 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
316 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
318 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
319 enum ieee80211_band band,
320 u8 is_active, u8 n_probes,
321 struct iwl_scan_channel *scan_ch)
323 struct ieee80211_channel *chan;
324 const struct ieee80211_supported_band *sband;
325 const struct iwl_channel_info *ch_info;
326 u16 passive_dwell = 0;
327 u16 active_dwell = 0;
331 sband = iwl_get_hw_mode(priv, band);
335 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
336 passive_dwell = iwl_get_passive_dwell_time(priv, band);
338 if (passive_dwell <= active_dwell)
339 passive_dwell = active_dwell + 1;
341 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
342 chan = priv->scan_request->channels[i];
344 if (chan->band != band)
347 channel = ieee80211_frequency_to_channel(chan->center_freq);
348 scan_ch->channel = cpu_to_le16(channel);
350 ch_info = iwl_get_channel_info(priv, band, channel);
351 if (!is_channel_valid(ch_info)) {
352 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
357 if (!is_active || is_channel_passive(ch_info) ||
358 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
359 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
361 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
364 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
366 scan_ch->active_dwell = cpu_to_le16(active_dwell);
367 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
369 /* Set txpower levels to defaults */
370 scan_ch->dsp_atten = 110;
372 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
374 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
376 if (band == IEEE80211_BAND_5GHZ)
377 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
379 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
381 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
382 channel, le32_to_cpu(scan_ch->type),
383 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
384 "ACTIVE" : "PASSIVE",
385 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
386 active_dwell : passive_dwell);
392 IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
396 void iwl_init_scan_params(struct iwl_priv *priv)
398 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
399 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
400 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
401 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
402 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
404 EXPORT_SYMBOL(iwl_init_scan_params);
406 static int iwl_scan_initiate(struct iwl_priv *priv)
408 if (!iwl_is_ready_rf(priv)) {
409 IWL_DEBUG_SCAN(priv, "Aborting scan due to not ready.\n");
413 if (test_bit(STATUS_SCANNING, &priv->status)) {
414 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
418 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
419 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
423 IWL_DEBUG_INFO(priv, "Starting scan...\n");
424 set_bit(STATUS_SCANNING, &priv->status);
425 priv->scan_start = jiffies;
426 priv->scan_pass_start = priv->scan_start;
428 queue_work(priv->workqueue, &priv->request_scan);
433 #define IWL_DELAY_NEXT_SCAN (HZ*2)
435 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
436 struct cfg80211_scan_request *req)
439 struct iwl_priv *priv = hw->priv;
442 IWL_DEBUG_MAC80211(priv, "enter\n");
444 mutex_lock(&priv->mutex);
445 spin_lock_irqsave(&priv->lock, flags);
447 if (!iwl_is_ready_rf(priv)) {
449 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
453 /* We don't schedule scan within next_scan_jiffies period.
454 * Avoid scanning during possible EAPOL exchange, return
455 * success immediately.
457 if (priv->next_scan_jiffies &&
458 time_after(priv->next_scan_jiffies, jiffies)) {
459 IWL_DEBUG_SCAN(priv, "scan rejected: within next scan period\n");
460 queue_work(priv->workqueue, &priv->scan_completed);
465 /* if we just finished scan ask for delay */
466 if (iwl_is_associated(priv) && priv->last_scan_jiffies &&
467 time_after(priv->last_scan_jiffies + IWL_DELAY_NEXT_SCAN, jiffies)) {
468 IWL_DEBUG_SCAN(priv, "scan rejected: within previous scan period\n");
469 queue_work(priv->workqueue, &priv->scan_completed);
474 priv->scan_bands = 0;
475 for (i = 0; i < req->n_channels; i++)
476 priv->scan_bands |= BIT(req->channels[i]->band);
478 priv->scan_request = req;
480 ret = iwl_scan_initiate(priv);
482 IWL_DEBUG_MAC80211(priv, "leave\n");
485 spin_unlock_irqrestore(&priv->lock, flags);
486 mutex_unlock(&priv->mutex);
490 EXPORT_SYMBOL(iwl_mac_hw_scan);
492 #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
494 void iwl_bg_scan_check(struct work_struct *data)
496 struct iwl_priv *priv =
497 container_of(data, struct iwl_priv, scan_check.work);
499 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
502 mutex_lock(&priv->mutex);
503 if (test_bit(STATUS_SCANNING, &priv->status) ||
504 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
505 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
507 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
509 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
510 iwl_send_scan_abort(priv);
512 mutex_unlock(&priv->mutex);
514 EXPORT_SYMBOL(iwl_bg_scan_check);
517 * iwl_fill_probe_req - fill in all required fields and IE for probe request
520 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
521 const u8 *ies, int ie_len, int left)
526 /* Make sure there is enough space for the probe request,
527 * two mandatory IEs and the data */
532 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
533 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
534 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
535 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
541 pos = &frame->u.probe_req.variable[0];
543 /* fill in our indirect SSID IE */
547 *pos++ = WLAN_EID_SSID;
552 if (WARN_ON(left < ie_len))
555 memcpy(pos, ies, ie_len);
561 EXPORT_SYMBOL(iwl_fill_probe_req);
563 static void iwl_bg_request_scan(struct work_struct *data)
565 struct iwl_priv *priv =
566 container_of(data, struct iwl_priv, request_scan);
567 struct iwl_host_cmd cmd = {
568 .id = REPLY_SCAN_CMD,
569 .len = sizeof(struct iwl_scan_cmd),
570 .flags = CMD_SIZE_HUGE,
572 struct iwl_scan_cmd *scan;
573 struct ieee80211_conf *conf = NULL;
578 enum ieee80211_band band;
580 u8 rx_ant = priv->hw_params.valid_rx_ant;
582 bool is_active = false;
586 conf = ieee80211_get_hw_conf(priv->hw);
588 mutex_lock(&priv->mutex);
590 cancel_delayed_work(&priv->scan_check);
592 if (!iwl_is_ready(priv)) {
593 IWL_WARN(priv, "request scan called when driver not ready.\n");
597 /* Make sure the scan wasn't canceled before this queued work
598 * was given the chance to run... */
599 if (!test_bit(STATUS_SCANNING, &priv->status))
602 /* This should never be called or scheduled if there is currently
603 * a scan active in the hardware. */
604 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
605 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
606 "Ignoring second request.\n");
611 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
612 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
616 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
617 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
621 if (iwl_is_rfkill(priv)) {
622 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
626 if (!test_bit(STATUS_READY, &priv->status)) {
627 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
631 if (!priv->scan_bands) {
632 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
637 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
638 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
645 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
647 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
648 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
650 if (iwl_is_associated(priv)) {
653 u32 suspend_time = 100;
654 u32 scan_suspend_time = 100;
657 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
659 spin_lock_irqsave(&priv->lock, flags);
660 interval = priv->beacon_int;
661 spin_unlock_irqrestore(&priv->lock, flags);
663 scan->suspend_time = 0;
664 scan->max_out_time = cpu_to_le32(200 * 1024);
666 interval = suspend_time;
668 extra = (suspend_time / interval) << 22;
669 scan_suspend_time = (extra |
670 ((suspend_time % interval) * 1024));
671 scan->suspend_time = cpu_to_le32(scan_suspend_time);
672 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
673 scan_suspend_time, interval);
676 if (priv->scan_request->n_ssids) {
678 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
679 for (i = 0; i < priv->scan_request->n_ssids; i++) {
680 /* always does wildcard anyway */
681 if (!priv->scan_request->ssids[i].ssid_len)
683 scan->direct_scan[p].id = WLAN_EID_SSID;
684 scan->direct_scan[p].len =
685 priv->scan_request->ssids[i].ssid_len;
686 memcpy(scan->direct_scan[p].ssid,
687 priv->scan_request->ssids[i].ssid,
688 priv->scan_request->ssids[i].ssid_len);
694 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
696 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
697 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
698 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
701 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
702 band = IEEE80211_BAND_2GHZ;
703 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
704 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
705 >> RXON_FLG_CHANNEL_MODE_POS;
706 if (chan_mod == CHANNEL_MODE_PURE_40) {
707 rate = IWL_RATE_6M_PLCP;
709 rate = IWL_RATE_1M_PLCP;
710 rate_flags = RATE_MCS_CCK_MSK;
712 scan->good_CRC_th = 0;
713 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
714 band = IEEE80211_BAND_5GHZ;
715 rate = IWL_RATE_6M_PLCP;
717 * If active scaning is requested but a certain channel
718 * is marked passive, we can do active scanning if we
719 * detect transmissions.
721 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0;
723 /* Force use of chains B and C (0x6) for scan Rx for 4965
724 * Avoid A (0x1) because of its off-channel reception on A-band.
726 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
729 IWL_WARN(priv, "Invalid scan band count\n");
733 priv->scan_tx_ant[band] =
734 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
735 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
736 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
738 /* In power save mode use one chain, otherwise use all chains */
739 if (test_bit(STATUS_POWER_PMI, &priv->status)) {
740 /* rx_ant has been set to all valid chains previously */
741 active_chains = rx_ant &
742 ((u8)(priv->chain_noise_data.active_chains));
744 active_chains = rx_ant;
746 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
747 priv->chain_noise_data.active_chains);
749 rx_ant = first_antenna(active_chains);
751 /* MIMO is not used here, but value is required */
752 rx_chain |= priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
753 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
754 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
755 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
756 scan->rx_chain = cpu_to_le16(rx_chain);
757 cmd_len = iwl_fill_probe_req(priv,
758 (struct ieee80211_mgmt *)scan->data,
759 priv->scan_request->ie,
760 priv->scan_request->ie_len,
761 IWL_MAX_SCAN_SIZE - sizeof(*scan));
763 scan->tx_cmd.len = cpu_to_le16(cmd_len);
765 if (iwl_is_monitor_mode(priv))
766 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
768 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
769 RXON_FILTER_BCON_AWARE_MSK);
771 scan->channel_count =
772 iwl_get_channels_for_scan(priv, band, is_active, n_probes,
773 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
775 if (scan->channel_count == 0) {
776 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
780 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
781 scan->channel_count * sizeof(struct iwl_scan_channel);
783 scan->len = cpu_to_le16(cmd.len);
785 set_bit(STATUS_SCAN_HW, &priv->status);
786 ret = iwl_send_cmd_sync(priv, &cmd);
790 queue_delayed_work(priv->workqueue, &priv->scan_check,
791 IWL_SCAN_CHECK_WATCHDOG);
793 mutex_unlock(&priv->mutex);
797 /* Cannot perform scan. Make sure we clear scanning
798 * bits from status so next scan request can be performed.
799 * If we don't clear scanning status bit here all next scan
802 clear_bit(STATUS_SCAN_HW, &priv->status);
803 clear_bit(STATUS_SCANNING, &priv->status);
804 /* inform mac80211 scan aborted */
805 queue_work(priv->workqueue, &priv->scan_completed);
806 mutex_unlock(&priv->mutex);
809 void iwl_bg_abort_scan(struct work_struct *work)
811 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
813 if (!test_bit(STATUS_READY, &priv->status) ||
814 !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
817 mutex_lock(&priv->mutex);
819 set_bit(STATUS_SCAN_ABORTING, &priv->status);
820 iwl_send_scan_abort(priv);
822 mutex_unlock(&priv->mutex);
824 EXPORT_SYMBOL(iwl_bg_abort_scan);
826 void iwl_bg_scan_completed(struct work_struct *work)
828 struct iwl_priv *priv =
829 container_of(work, struct iwl_priv, scan_completed);
831 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
833 cancel_delayed_work(&priv->scan_check);
835 ieee80211_scan_completed(priv->hw, false);
837 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
840 /* Since setting the TXPOWER may have been deferred while
841 * performing the scan, fire one off */
842 mutex_lock(&priv->mutex);
843 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
844 mutex_unlock(&priv->mutex);
846 EXPORT_SYMBOL(iwl_bg_scan_completed);
848 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
850 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
851 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
852 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
853 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
855 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);