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 static 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 .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
.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
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
);
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
);
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: "
177 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
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: "
196 "(TSF: 0x%08X:%08X) - %d "
197 "elapsed=%lu usec (%dms since last)\n",
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
)));
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
,
223 scan_notif
->tsf_high
, scan_notif
->status
);
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
)) ?
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
);
250 /* If there are more bands on this scan pass reschedule */
251 if (priv
->scan_bands
)
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
);
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
)
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
,
289 if (band
== IEEE80211_BAND_5GHZ
)
290 return IWL_ACTIVE_DWELL_TIME_52
+
291 IWL_ACTIVE_DWELL_FACTOR_52GHZ
* (n_probes
+ 1);
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;
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;
332 sband
= iwl_get_hw_mode(priv
, band
);
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
)
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",
358 if (!is_active
|| is_channel_passive(ch_info
) ||
359 (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
))
360 scan_ch
->type
= SCAN_CHANNEL_TYPE_PASSIVE
;
362 scan_ch
->type
= SCAN_CHANNEL_TYPE_ACTIVE
;
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
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;
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
);
393 IWL_DEBUG_SCAN(priv
, "total channels to scan %d \n", 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");
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;
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");
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
))
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");
610 if (test_bit(STATUS_EXIT_PENDING
, &priv
->status
)) {
611 IWL_DEBUG_SCAN(priv
, "Aborting scan due to device shutdown\n");
615 if (test_bit(STATUS_SCAN_ABORTING
, &priv
->status
)) {
616 IWL_DEBUG_HC(priv
, "Scan request while abort pending. Queuing.\n");
620 if (iwl_is_rfkill(priv
)) {
621 IWL_DEBUG_HC(priv
, "Aborting scan due to RF Kill activation\n");
625 if (!test_bit(STATUS_READY
, &priv
->status
)) {
626 IWL_DEBUG_HC(priv
, "Scan request while uninitialized. Queuing.\n");
630 if (!priv
->scan_bands
) {
631 IWL_DEBUG_HC(priv
, "Aborting scan due to no requested bands\n");
636 priv
->scan
= kmalloc(sizeof(struct iwl_scan_cmd
) +
637 IWL_MAX_SCAN_SIZE
, GFP_KERNEL
);
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
)) {
652 u32 suspend_time
= 100;
653 u32 scan_suspend_time
= 100;
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);
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
) {
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
)
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
);
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
;
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
)
728 IWL_WARN(priv
, "Invalid scan band count\n");
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
);
766 cmd
.len
+= le16_to_cpu(scan
->tx_cmd
.len
) +
767 scan
->channel_count
* sizeof(struct iwl_scan_channel
);
769 scan
->len
= cpu_to_le16(cmd
.len
);
771 set_bit(STATUS_SCAN_HW
, &priv
->status
);
772 ret
= iwl_send_cmd_sync(priv
, &cmd
);
776 queue_delayed_work(priv
->workqueue
, &priv
->scan_check
,
777 IWL_SCAN_CHECK_WATCHDOG
);
779 mutex_unlock(&priv
->mutex
);
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
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
))
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
))
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
);