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/lib80211.h>
31 #include <net/mac80211.h>
33 #include "iwl-eeprom.h"
38 #include "iwl-helpers.h"
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)
46 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
47 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
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
60 * iwl_scan_cancel - Cancel any currently executing HW scan
62 * NOTE: priv->mutex is not required before calling this function
64 int iwl_scan_cancel(struct iwl_priv *priv)
66 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
67 clear_bit(STATUS_SCANNING, &priv->status);
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);
78 IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
80 return test_bit(STATUS_SCANNING, &priv->status);
85 EXPORT_SYMBOL(iwl_scan_cancel);
87 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
88 * @ms: amount of time to wait (in milliseconds) for scan to abort
90 * NOTE: priv->mutex must be held before calling this function
92 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
94 unsigned long now = jiffies;
97 ret = iwl_scan_cancel(priv);
99 mutex_unlock(&priv->mutex);
100 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
101 test_bit(STATUS_SCANNING, &priv->status))
103 mutex_lock(&priv->mutex);
105 return test_bit(STATUS_SCANNING, &priv->status);
110 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
112 int iwl_send_scan_abort(struct iwl_priv *priv)
115 struct iwl_rx_packet *res;
116 struct iwl_host_cmd cmd = {
117 .id = REPLY_SCAN_ABORT_CMD,
118 .meta.flags = CMD_WANT_SKB,
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);
129 ret = iwl_send_cmd_sync(priv, &cmd);
131 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
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
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);
148 priv->alloc_rxb_skb--;
149 dev_kfree_skb_any(cmd.meta.u.skb);
153 EXPORT_SYMBOL(iwl_send_scan_abort);
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)
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;
164 IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
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)
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: "
178 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
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);
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)
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;
195 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
197 "(TSF: 0x%08X:%08X) - %d "
198 "elapsed=%lu usec (%dms since last)\n",
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)));
209 priv->last_scan_jiffies = jiffies;
210 priv->next_scan_jiffies = 0;
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)
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;
221 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
222 scan_notif->scanned_channels,
224 scan_notif->tsf_high, scan_notif->status);
227 /* The HW is no longer scanning */
228 clear_bit(STATUS_SCAN_HW, &priv->status);
230 /* The scan completion notification came in, so kill that timer... */
231 cancel_delayed_work(&priv->scan_check);
233 IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n",
234 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
236 jiffies_to_msecs(elapsed_jiffies
237 (priv->scan_pass_start, jiffies)));
239 /* Remove this scanned band from the list of pending
240 * bands to scan, band G precedes A in order of scanning
241 * as seen in iwl_bg_request_scan */
242 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
243 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
244 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
245 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
247 /* If a request to abort was given, or the scan did not succeed
248 * then we reset the scan state machine and terminate,
249 * re-queuing another scan if one has been requested */
250 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
251 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
252 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
254 /* If there are more bands on this scan pass reschedule */
255 if (priv->scan_bands)
259 priv->last_scan_jiffies = jiffies;
260 priv->next_scan_jiffies = 0;
261 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
263 clear_bit(STATUS_SCANNING, &priv->status);
265 IWL_DEBUG_INFO(priv, "Scan took %dms\n",
266 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
268 queue_work(priv->workqueue, &priv->scan_completed);
273 priv->scan_pass_start = jiffies;
274 queue_work(priv->workqueue, &priv->request_scan);
277 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
280 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
281 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
282 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
283 iwl_rx_scan_results_notif;
284 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
285 iwl_rx_scan_complete_notif;
287 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
289 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
290 enum ieee80211_band band,
293 if (band == IEEE80211_BAND_5GHZ)
294 return IWL_ACTIVE_DWELL_TIME_52 +
295 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
297 return IWL_ACTIVE_DWELL_TIME_24 +
298 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
300 EXPORT_SYMBOL(iwl_get_active_dwell_time);
302 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
303 enum ieee80211_band band)
305 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
306 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
307 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
309 if (iwl_is_associated(priv)) {
310 /* If we're associated, we clamp the maximum passive
311 * dwell time to be 98% of the beacon interval (minus
312 * 2 * channel tune time) */
313 passive = priv->beacon_int;
314 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
315 passive = IWL_PASSIVE_DWELL_BASE;
316 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
321 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
323 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
324 enum ieee80211_band band,
325 u8 is_active, u8 n_probes,
326 struct iwl_scan_channel *scan_ch)
328 const struct ieee80211_channel *channels = NULL;
329 const struct ieee80211_supported_band *sband;
330 const struct iwl_channel_info *ch_info;
331 u16 passive_dwell = 0;
332 u16 active_dwell = 0;
336 sband = iwl_get_hw_mode(priv, band);
340 channels = sband->channels;
342 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
343 passive_dwell = iwl_get_passive_dwell_time(priv, band);
345 if (passive_dwell <= active_dwell)
346 passive_dwell = active_dwell + 1;
348 for (i = 0, added = 0; i < sband->n_channels; i++) {
349 if (channels[i].flags & IEEE80211_CHAN_DISABLED)
353 ieee80211_frequency_to_channel(channels[i].center_freq);
354 scan_ch->channel = cpu_to_le16(channel);
356 ch_info = iwl_get_channel_info(priv, band, channel);
357 if (!is_channel_valid(ch_info)) {
358 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
363 if (!is_active || is_channel_passive(ch_info) ||
364 (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
365 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
367 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
370 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
372 scan_ch->active_dwell = cpu_to_le16(active_dwell);
373 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
375 /* Set txpower levels to defaults */
376 scan_ch->dsp_atten = 110;
378 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
380 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
382 if (band == IEEE80211_BAND_5GHZ)
383 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
385 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
387 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
388 channel, le32_to_cpu(scan_ch->type),
389 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
390 "ACTIVE" : "PASSIVE",
391 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
392 active_dwell : passive_dwell);
398 IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
402 void iwl_init_scan_params(struct iwl_priv *priv)
404 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
405 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
406 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
407 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
408 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
411 int iwl_scan_initiate(struct iwl_priv *priv)
413 if (!iwl_is_ready_rf(priv)) {
414 IWL_DEBUG_SCAN(priv, "Aborting scan due to not ready.\n");
418 if (test_bit(STATUS_SCANNING, &priv->status)) {
419 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
423 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
424 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
428 IWL_DEBUG_INFO(priv, "Starting scan...\n");
429 if (priv->cfg->sku & IWL_SKU_G)
430 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
431 if (priv->cfg->sku & IWL_SKU_A)
432 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
433 set_bit(STATUS_SCANNING, &priv->status);
434 priv->scan_start = jiffies;
435 priv->scan_pass_start = priv->scan_start;
437 queue_work(priv->workqueue, &priv->request_scan);
441 EXPORT_SYMBOL(iwl_scan_initiate);
443 #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
445 void iwl_bg_scan_check(struct work_struct *data)
447 struct iwl_priv *priv =
448 container_of(data, struct iwl_priv, scan_check.work);
450 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
453 mutex_lock(&priv->mutex);
454 if (test_bit(STATUS_SCANNING, &priv->status) ||
455 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
456 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
458 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
460 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
461 iwl_send_scan_abort(priv);
463 mutex_unlock(&priv->mutex);
465 EXPORT_SYMBOL(iwl_bg_scan_check);
468 * iwl_supported_rate_to_ie - fill in the supported rate in IE field
470 * return : set the bit for each supported rate insert in ie
472 static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
473 u16 basic_rate, int *left)
475 u16 ret_rates = 0, bit;
480 for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
481 if (bit & supported_rate) {
483 rates[*cnt] = iwl_rates[i].ieee |
484 ((bit & basic_rate) ? 0x80 : 0x00);
488 (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
497 static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
500 struct ieee80211_ht_cap *ht_cap;
502 if (!sband || !sband->ht_cap.ht_supported)
505 if (*left < sizeof(struct ieee80211_ht_cap))
508 *pos++ = sizeof(struct ieee80211_ht_cap);
509 ht_cap = (struct ieee80211_ht_cap *) pos;
511 ht_cap->cap_info = cpu_to_le16(sband->ht_cap.cap);
512 memcpy(&ht_cap->mcs, &sband->ht_cap.mcs, 16);
513 ht_cap->ampdu_params_info =
514 (sband->ht_cap.ampdu_factor & IEEE80211_HT_AMPDU_PARM_FACTOR) |
515 ((sband->ht_cap.ampdu_density << 2) &
516 IEEE80211_HT_AMPDU_PARM_DENSITY);
517 *left -= sizeof(struct ieee80211_ht_cap);
521 * iwl_fill_probe_req - fill in all required fields and IE for probe request
524 u16 iwl_fill_probe_req(struct iwl_priv *priv,
525 enum ieee80211_band band,
526 struct ieee80211_mgmt *frame,
531 u16 active_rates, ret_rates, cck_rates, active_rate_basic;
532 const struct ieee80211_supported_band *sband =
533 iwl_get_hw_mode(priv, band);
536 /* Make sure there is enough space for the probe request,
537 * two mandatory IEs and the data */
542 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
543 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
544 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
545 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
551 pos = &frame->u.probe_req.variable[0];
553 /* fill in our indirect SSID IE */
557 *pos++ = WLAN_EID_SSID;
562 /* fill in supported rate */
567 *pos++ = WLAN_EID_SUPP_RATES;
570 /* exclude 60M rate */
571 active_rates = priv->rates_mask;
572 active_rates &= ~IWL_RATE_60M_MASK;
574 active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
576 cck_rates = IWL_CCK_RATES_MASK & active_rates;
577 ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
578 active_rate_basic, &left);
579 active_rates &= ~ret_rates;
581 ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
582 active_rate_basic, &left);
583 active_rates &= ~ret_rates;
588 if (active_rates == 0)
591 /* fill in supported extended rate */
596 /* ... fill it in... */
597 *pos++ = WLAN_EID_EXT_SUPP_RATES;
599 iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left);
613 *pos++ = WLAN_EID_HT_CAPABILITY;
615 iwl_ht_cap_to_ie(sband, pos, &left);
621 EXPORT_SYMBOL(iwl_fill_probe_req);
623 static void iwl_bg_request_scan(struct work_struct *data)
625 struct iwl_priv *priv =
626 container_of(data, struct iwl_priv, request_scan);
627 struct iwl_host_cmd cmd = {
628 .id = REPLY_SCAN_CMD,
629 .len = sizeof(struct iwl_scan_cmd),
630 .meta.flags = CMD_SIZE_HUGE,
632 struct iwl_scan_cmd *scan;
633 struct ieee80211_conf *conf = NULL;
637 enum ieee80211_band band;
639 u8 rx_chain = priv->hw_params.valid_rx_ant;
641 DECLARE_SSID_BUF(ssid);
643 conf = ieee80211_get_hw_conf(priv->hw);
645 mutex_lock(&priv->mutex);
647 if (!iwl_is_ready(priv)) {
648 IWL_WARN(priv, "request scan called when driver not ready.\n");
652 /* Make sure the scan wasn't canceled before this queued work
653 * was given the chance to run... */
654 if (!test_bit(STATUS_SCANNING, &priv->status))
657 /* This should never be called or scheduled if there is currently
658 * a scan active in the hardware. */
659 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
660 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
661 "Ignoring second request.\n");
666 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
667 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
671 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
672 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
676 if (iwl_is_rfkill(priv)) {
677 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
681 if (!test_bit(STATUS_READY, &priv->status)) {
682 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
686 if (!priv->scan_bands) {
687 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
692 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
693 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
700 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
702 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
703 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
705 if (iwl_is_associated(priv)) {
708 u32 suspend_time = 100;
709 u32 scan_suspend_time = 100;
712 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
714 spin_lock_irqsave(&priv->lock, flags);
715 interval = priv->beacon_int;
716 spin_unlock_irqrestore(&priv->lock, flags);
718 scan->suspend_time = 0;
719 scan->max_out_time = cpu_to_le32(200 * 1024);
721 interval = suspend_time;
723 extra = (suspend_time / interval) << 22;
724 scan_suspend_time = (extra |
725 ((suspend_time % interval) * 1024));
726 scan->suspend_time = cpu_to_le32(scan_suspend_time);
727 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
728 scan_suspend_time, interval);
731 /* We should add the ability for user to lock to PASSIVE ONLY */
732 if (priv->one_direct_scan) {
733 IWL_DEBUG_SCAN(priv, "Start direct scan for '%s'\n",
734 print_ssid(ssid, priv->direct_ssid,
735 priv->direct_ssid_len));
736 scan->direct_scan[0].id = WLAN_EID_SSID;
737 scan->direct_scan[0].len = priv->direct_ssid_len;
738 memcpy(scan->direct_scan[0].ssid,
739 priv->direct_ssid, priv->direct_ssid_len);
742 IWL_DEBUG_SCAN(priv, "Start indirect scan.\n");
745 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
746 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
747 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
750 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
751 band = IEEE80211_BAND_2GHZ;
752 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
753 if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) {
754 rate = IWL_RATE_6M_PLCP;
756 rate = IWL_RATE_1M_PLCP;
757 rate_flags = RATE_MCS_CCK_MSK;
759 scan->good_CRC_th = 0;
760 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
761 band = IEEE80211_BAND_5GHZ;
762 rate = IWL_RATE_6M_PLCP;
763 scan->good_CRC_th = IWL_GOOD_CRC_TH;
765 /* Force use of chains B and C (0x6) for scan Rx for 4965
766 * Avoid A (0x1) because of its off-channel reception on A-band.
768 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
771 IWL_WARN(priv, "Invalid scan band count\n");
775 priv->scan_tx_ant[band] =
776 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
777 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
778 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
780 /* MIMO is not used here, but value is required */
781 scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK |
782 cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
783 (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) |
784 (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
786 cmd_len = iwl_fill_probe_req(priv, band,
787 (struct ieee80211_mgmt *)scan->data,
788 IWL_MAX_SCAN_SIZE - sizeof(*scan));
790 scan->tx_cmd.len = cpu_to_le16(cmd_len);
792 if (priv->iw_mode == NL80211_IFTYPE_MONITOR)
793 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
795 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
796 RXON_FILTER_BCON_AWARE_MSK);
798 scan->channel_count =
799 iwl_get_channels_for_scan(priv, band, 1, /* active */
801 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
803 if (scan->channel_count == 0) {
804 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
808 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
809 scan->channel_count * sizeof(struct iwl_scan_channel);
811 scan->len = cpu_to_le16(cmd.len);
813 set_bit(STATUS_SCAN_HW, &priv->status);
814 ret = iwl_send_cmd_sync(priv, &cmd);
818 queue_delayed_work(priv->workqueue, &priv->scan_check,
819 IWL_SCAN_CHECK_WATCHDOG);
821 mutex_unlock(&priv->mutex);
825 /* Cannot perform scan. Make sure we clear scanning
826 * bits from status so next scan request can be performed.
827 * If we don't clear scanning status bit here all next scan
830 clear_bit(STATUS_SCAN_HW, &priv->status);
831 clear_bit(STATUS_SCANNING, &priv->status);
832 /* inform mac80211 scan aborted */
833 queue_work(priv->workqueue, &priv->scan_completed);
834 mutex_unlock(&priv->mutex);
837 void iwl_bg_abort_scan(struct work_struct *work)
839 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
841 if (!iwl_is_ready(priv))
844 mutex_lock(&priv->mutex);
846 set_bit(STATUS_SCAN_ABORTING, &priv->status);
847 iwl_send_scan_abort(priv);
849 mutex_unlock(&priv->mutex);
851 EXPORT_SYMBOL(iwl_bg_abort_scan);
853 void iwl_bg_scan_completed(struct work_struct *work)
855 struct iwl_priv *priv =
856 container_of(work, struct iwl_priv, scan_completed);
858 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
860 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
863 ieee80211_scan_completed(priv->hw);
865 /* Since setting the TXPOWER may have been deferred while
866 * performing the scan, fire one off */
867 mutex_lock(&priv->mutex);
868 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
869 mutex_unlock(&priv->mutex);
871 EXPORT_SYMBOL(iwl_bg_scan_completed);
873 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
875 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
876 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
877 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
878 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
880 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);