[ARM] pxa: Gumstix Verdex PCMCIA support
[linux-2.6/verdex.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
blob4f3a108fa9901e1c9ee314ea59020838dfb99120
1 /******************************************************************************
3 * GPL LICENSE SUMMARY
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,
19 * USA
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"
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"
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
59 /**
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);
68 return 0;
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);
77 } else
78 IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
80 return test_bit(STATUS_SCANNING, &priv->status);
83 return 0;
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
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;
95 int ret;
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);
105 return test_bit(STATUS_SCANNING, &priv->status);
108 return ret;
110 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
112 static int iwl_send_scan_abort(struct iwl_priv *priv)
114 int ret = 0;
115 struct iwl_rx_packet *res;
116 struct iwl_host_cmd cmd = {
117 .id = REPLY_SCAN_ABORT_CMD,
118 .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);
126 return 0;
129 ret = iwl_send_cmd_sync(priv, &cmd);
130 if (ret) {
131 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
132 return ret;
135 res = (struct iwl_rx_packet *)cmd.reply_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);
148 priv->alloc_rxb_skb--;
149 dev_kfree_skb_any(cmd.reply_skb);
151 return ret;
154 /* Service response to REPLY_SCAN_CMD (0x80) */
155 static void iwl_rx_reply_scan(struct iwl_priv *priv,
156 struct iwl_rx_mem_buffer *rxb)
158 #ifdef CONFIG_IWLWIFI_DEBUG
159 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
160 struct iwl_scanreq_notification *notif =
161 (struct iwl_scanreq_notification *)pkt->u.raw;
163 IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
164 #endif
167 /* Service SCAN_START_NOTIFICATION (0x82) */
168 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
169 struct iwl_rx_mem_buffer *rxb)
171 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
172 struct iwl_scanstart_notification *notif =
173 (struct iwl_scanstart_notification *)pkt->u.raw;
174 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
175 IWL_DEBUG_SCAN(priv, "Scan start: "
176 "%d [802.11%s] "
177 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
178 notif->channel,
179 notif->band ? "bg" : "a",
180 le32_to_cpu(notif->tsf_high),
181 le32_to_cpu(notif->tsf_low),
182 notif->status, notif->beacon_timer);
185 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
186 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
187 struct iwl_rx_mem_buffer *rxb)
189 #ifdef CONFIG_IWLWIFI_DEBUG
190 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
191 struct iwl_scanresults_notification *notif =
192 (struct iwl_scanresults_notification *)pkt->u.raw;
194 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
195 "%d [802.11%s] "
196 "(TSF: 0x%08X:%08X) - %d "
197 "elapsed=%lu usec (%dms since last)\n",
198 notif->channel,
199 notif->band ? "bg" : "a",
200 le32_to_cpu(notif->tsf_high),
201 le32_to_cpu(notif->tsf_low),
202 le32_to_cpu(notif->statistics[0]),
203 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf,
204 jiffies_to_msecs(elapsed_jiffies
205 (priv->last_scan_jiffies, jiffies)));
206 #endif
208 priv->last_scan_jiffies = jiffies;
209 priv->next_scan_jiffies = 0;
212 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
213 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
214 struct iwl_rx_mem_buffer *rxb)
216 #ifdef CONFIG_IWLWIFI_DEBUG
217 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
218 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
220 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
221 scan_notif->scanned_channels,
222 scan_notif->tsf_low,
223 scan_notif->tsf_high, scan_notif->status);
224 #endif
226 /* The HW is no longer scanning */
227 clear_bit(STATUS_SCAN_HW, &priv->status);
229 IWL_DEBUG_INFO(priv, "Scan pass on %sGHz took %dms\n",
230 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
231 "2.4" : "5.2",
232 jiffies_to_msecs(elapsed_jiffies
233 (priv->scan_pass_start, jiffies)));
235 /* Remove this scanned band from the list of pending
236 * bands to scan, band G precedes A in order of scanning
237 * as seen in iwl_bg_request_scan */
238 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
239 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
240 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
241 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
243 /* If a request to abort was given, or the scan did not succeed
244 * then we reset the scan state machine and terminate,
245 * re-queuing another scan if one has been requested */
246 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
247 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
248 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
249 } else {
250 /* If there are more bands on this scan pass reschedule */
251 if (priv->scan_bands)
252 goto reschedule;
255 priv->last_scan_jiffies = jiffies;
256 priv->next_scan_jiffies = 0;
257 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
259 clear_bit(STATUS_SCANNING, &priv->status);
261 IWL_DEBUG_INFO(priv, "Scan took %dms\n",
262 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
264 queue_work(priv->workqueue, &priv->scan_completed);
266 return;
268 reschedule:
269 priv->scan_pass_start = jiffies;
270 queue_work(priv->workqueue, &priv->request_scan);
273 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
275 /* scan handlers */
276 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
277 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
278 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
279 iwl_rx_scan_results_notif;
280 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
281 iwl_rx_scan_complete_notif;
283 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
285 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
286 enum ieee80211_band band,
287 u8 n_probes)
289 if (band == IEEE80211_BAND_5GHZ)
290 return IWL_ACTIVE_DWELL_TIME_52 +
291 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
292 else
293 return IWL_ACTIVE_DWELL_TIME_24 +
294 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
296 EXPORT_SYMBOL(iwl_get_active_dwell_time);
298 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
299 enum ieee80211_band band)
301 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
302 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
303 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
305 if (iwl_is_associated(priv)) {
306 /* If we're associated, we clamp the maximum passive
307 * dwell time to be 98% of the beacon interval (minus
308 * 2 * channel tune time) */
309 passive = priv->beacon_int;
310 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
311 passive = IWL_PASSIVE_DWELL_BASE;
312 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
315 return passive;
317 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
319 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
320 enum ieee80211_band band,
321 u8 is_active, u8 n_probes,
322 struct iwl_scan_channel *scan_ch)
324 struct ieee80211_channel *chan;
325 const struct ieee80211_supported_band *sband;
326 const struct iwl_channel_info *ch_info;
327 u16 passive_dwell = 0;
328 u16 active_dwell = 0;
329 int added, i;
330 u16 channel;
332 sband = iwl_get_hw_mode(priv, band);
333 if (!sband)
334 return 0;
336 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
337 passive_dwell = iwl_get_passive_dwell_time(priv, band);
339 if (passive_dwell <= active_dwell)
340 passive_dwell = active_dwell + 1;
342 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
343 chan = priv->scan_request->channels[i];
345 if (chan->band != band)
346 continue;
348 channel = ieee80211_frequency_to_channel(chan->center_freq);
349 scan_ch->channel = cpu_to_le16(channel);
351 ch_info = iwl_get_channel_info(priv, band, channel);
352 if (!is_channel_valid(ch_info)) {
353 IWL_DEBUG_SCAN(priv, "Channel %d is INVALID for this band.\n",
354 channel);
355 continue;
358 if (!is_active || is_channel_passive(ch_info) ||
359 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
360 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
361 else
362 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
364 if (n_probes)
365 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
367 scan_ch->active_dwell = cpu_to_le16(active_dwell);
368 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
370 /* Set txpower levels to defaults */
371 scan_ch->dsp_atten = 110;
373 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
374 * power level:
375 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
377 if (band == IEEE80211_BAND_5GHZ)
378 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
379 else
380 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
382 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
383 channel, le32_to_cpu(scan_ch->type),
384 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
385 "ACTIVE" : "PASSIVE",
386 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
387 active_dwell : passive_dwell);
389 scan_ch++;
390 added++;
393 IWL_DEBUG_SCAN(priv, "total channels to scan %d \n", added);
394 return added;
397 void iwl_init_scan_params(struct iwl_priv *priv)
399 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
400 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
401 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
402 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
403 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
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");
410 return -EIO;
413 if (test_bit(STATUS_SCANNING, &priv->status)) {
414 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
415 return -EAGAIN;
418 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
419 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
420 return -EAGAIN;
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);
430 return 0;
433 #define IWL_DELAY_NEXT_SCAN (HZ*2)
435 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
436 struct cfg80211_scan_request *req)
438 unsigned long flags;
439 struct iwl_priv *priv = hw->priv;
440 int ret, i;
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)) {
448 ret = -EIO;
449 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
450 goto out_unlock;
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);
461 ret = 0;
462 goto out_unlock;
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);
470 ret = 0;
471 goto out_unlock;
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");
484 out_unlock:
485 spin_unlock_irqrestore(&priv->lock, flags);
486 mutex_unlock(&priv->mutex);
488 return ret;
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))
500 return;
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 "
506 "adapter (%dms)\n",
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)
523 int len = 0;
524 u8 *pos = NULL;
526 /* Make sure there is enough space for the probe request,
527 * two mandatory IEs and the data */
528 left -= 24;
529 if (left < 0)
530 return 0;
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);
536 frame->seq_ctrl = 0;
538 len += 24;
540 /* ...next IE... */
541 pos = &frame->u.probe_req.variable[0];
543 /* fill in our indirect SSID IE */
544 left -= 2;
545 if (left < 0)
546 return 0;
547 *pos++ = WLAN_EID_SSID;
548 *pos++ = 0;
550 len += 2;
552 if (WARN_ON(left < ie_len))
553 return len;
555 memcpy(pos, ies, ie_len);
556 len += ie_len;
557 left -= ie_len;
559 return (u16)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;
574 int ret = 0;
575 u32 rate_flags = 0;
576 u16 cmd_len;
577 u16 rx_chain = 0;
578 enum ieee80211_band band;
579 u8 n_probes = 0;
580 u8 rx_ant = priv->hw_params.valid_rx_ant;
581 u8 rate;
582 bool is_active = false;
583 int chan_mod;
585 conf = ieee80211_get_hw_conf(priv->hw);
587 mutex_lock(&priv->mutex);
589 cancel_delayed_work(&priv->scan_check);
591 if (!iwl_is_ready(priv)) {
592 IWL_WARN(priv, "request scan called when driver not ready.\n");
593 goto done;
596 /* Make sure the scan wasn't canceled before this queued work
597 * was given the chance to run... */
598 if (!test_bit(STATUS_SCANNING, &priv->status))
599 goto done;
601 /* This should never be called or scheduled if there is currently
602 * a scan active in the hardware. */
603 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
604 IWL_DEBUG_INFO(priv, "Multiple concurrent scan requests in parallel. "
605 "Ignoring second request.\n");
606 ret = -EIO;
607 goto done;
610 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
611 IWL_DEBUG_SCAN(priv, "Aborting scan due to device shutdown\n");
612 goto done;
615 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
616 IWL_DEBUG_HC(priv, "Scan request while abort pending. Queuing.\n");
617 goto done;
620 if (iwl_is_rfkill(priv)) {
621 IWL_DEBUG_HC(priv, "Aborting scan due to RF Kill activation\n");
622 goto done;
625 if (!test_bit(STATUS_READY, &priv->status)) {
626 IWL_DEBUG_HC(priv, "Scan request while uninitialized. Queuing.\n");
627 goto done;
630 if (!priv->scan_bands) {
631 IWL_DEBUG_HC(priv, "Aborting scan due to no requested bands\n");
632 goto done;
635 if (!priv->scan) {
636 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
637 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
638 if (!priv->scan) {
639 ret = -ENOMEM;
640 goto done;
643 scan = priv->scan;
644 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
646 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
647 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
649 if (iwl_is_associated(priv)) {
650 u16 interval = 0;
651 u32 extra;
652 u32 suspend_time = 100;
653 u32 scan_suspend_time = 100;
654 unsigned long flags;
656 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
658 spin_lock_irqsave(&priv->lock, flags);
659 interval = priv->beacon_int;
660 spin_unlock_irqrestore(&priv->lock, flags);
662 scan->suspend_time = 0;
663 scan->max_out_time = cpu_to_le32(200 * 1024);
664 if (!interval)
665 interval = suspend_time;
667 extra = (suspend_time / interval) << 22;
668 scan_suspend_time = (extra |
669 ((suspend_time % interval) * 1024));
670 scan->suspend_time = cpu_to_le32(scan_suspend_time);
671 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
672 scan_suspend_time, interval);
675 if (priv->scan_request->n_ssids) {
676 int i, p = 0;
677 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
678 for (i = 0; i < priv->scan_request->n_ssids; i++) {
679 /* always does wildcard anyway */
680 if (!priv->scan_request->ssids[i].ssid_len)
681 continue;
682 scan->direct_scan[p].id = WLAN_EID_SSID;
683 scan->direct_scan[p].len =
684 priv->scan_request->ssids[i].ssid_len;
685 memcpy(scan->direct_scan[p].ssid,
686 priv->scan_request->ssids[i].ssid,
687 priv->scan_request->ssids[i].ssid_len);
688 n_probes++;
689 p++;
691 is_active = true;
692 } else
693 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
695 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
696 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
697 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
700 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
701 band = IEEE80211_BAND_2GHZ;
702 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
703 chan_mod = le32_to_cpu(priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_MSK)
704 >> RXON_FLG_CHANNEL_MODE_POS;
705 if (chan_mod == CHANNEL_MODE_PURE_40) {
706 rate = IWL_RATE_6M_PLCP;
707 } else {
708 rate = IWL_RATE_1M_PLCP;
709 rate_flags = RATE_MCS_CCK_MSK;
711 scan->good_CRC_th = 0;
712 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
713 band = IEEE80211_BAND_5GHZ;
714 rate = IWL_RATE_6M_PLCP;
716 * If active scaning is requested but a certain channel
717 * is marked passive, we can do active scanning if we
718 * detect transmissions.
720 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH : 0;
722 /* Force use of chains B and C (0x6) for scan Rx for 4965
723 * Avoid A (0x1) because of its off-channel reception on A-band.
725 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
726 rx_ant = ANT_BC;
727 } else {
728 IWL_WARN(priv, "Invalid scan band count\n");
729 goto done;
732 priv->scan_tx_ant[band] =
733 iwl_toggle_tx_ant(priv, priv->scan_tx_ant[band]);
734 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
735 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
737 /* MIMO is not used here, but value is required */
738 rx_chain |= ANT_ABC << RXON_RX_CHAIN_VALID_POS;
739 rx_chain |= ANT_ABC << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
740 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
741 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
742 scan->rx_chain = cpu_to_le16(rx_chain);
743 cmd_len = iwl_fill_probe_req(priv,
744 (struct ieee80211_mgmt *)scan->data,
745 priv->scan_request->ie,
746 priv->scan_request->ie_len,
747 IWL_MAX_SCAN_SIZE - sizeof(*scan));
749 scan->tx_cmd.len = cpu_to_le16(cmd_len);
751 if (iwl_is_monitor_mode(priv))
752 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
754 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
755 RXON_FILTER_BCON_AWARE_MSK);
757 scan->channel_count =
758 iwl_get_channels_for_scan(priv, band, is_active, n_probes,
759 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
761 if (scan->channel_count == 0) {
762 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
763 goto done;
766 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
767 scan->channel_count * sizeof(struct iwl_scan_channel);
768 cmd.data = scan;
769 scan->len = cpu_to_le16(cmd.len);
771 set_bit(STATUS_SCAN_HW, &priv->status);
772 ret = iwl_send_cmd_sync(priv, &cmd);
773 if (ret)
774 goto done;
776 queue_delayed_work(priv->workqueue, &priv->scan_check,
777 IWL_SCAN_CHECK_WATCHDOG);
779 mutex_unlock(&priv->mutex);
780 return;
782 done:
783 /* Cannot perform scan. Make sure we clear scanning
784 * bits from status so next scan request can be performed.
785 * If we don't clear scanning status bit here all next scan
786 * will fail
788 clear_bit(STATUS_SCAN_HW, &priv->status);
789 clear_bit(STATUS_SCANNING, &priv->status);
790 /* inform mac80211 scan aborted */
791 queue_work(priv->workqueue, &priv->scan_completed);
792 mutex_unlock(&priv->mutex);
795 void iwl_bg_abort_scan(struct work_struct *work)
797 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
799 if (!test_bit(STATUS_READY, &priv->status) ||
800 !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
801 return;
803 mutex_lock(&priv->mutex);
805 set_bit(STATUS_SCAN_ABORTING, &priv->status);
806 iwl_send_scan_abort(priv);
808 mutex_unlock(&priv->mutex);
810 EXPORT_SYMBOL(iwl_bg_abort_scan);
812 void iwl_bg_scan_completed(struct work_struct *work)
814 struct iwl_priv *priv =
815 container_of(work, struct iwl_priv, scan_completed);
817 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
819 cancel_delayed_work(&priv->scan_check);
821 ieee80211_scan_completed(priv->hw, false);
823 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
824 return;
826 /* Since setting the TXPOWER may have been deferred while
827 * performing the scan, fire one off */
828 mutex_lock(&priv->mutex);
829 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
830 mutex_unlock(&priv->mutex);
832 EXPORT_SYMBOL(iwl_bg_scan_completed);
834 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
836 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
837 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
838 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
839 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
841 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);