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Merge tag 'drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
CommitLineData
2a421b91
TW		 1/******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
fb4961db 5 * Copyright(c) 2008 - 2012 Intel Corporation. All rights reserved.
2a421b91
TW		 6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
19 * USA
20 *
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
23 *
24 * Contact Information:
759ef89f 25 * Intel Linux Wireless <ilw@linux.intel.com>
2a421b91
TW		 26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
5a0e3ad6 28#include <linux/slab.h>
7e272fcf 29#include <linux/types.h>
2a421b91 30#include <linux/etherdevice.h>
7e272fcf 31#include <net/mac80211.h>
2a421b91
TW		 32
33#include "iwl-eeprom.h"
34#include "iwl-dev.h"
2a421b91 35#include "iwl-io.h"
e80d70e9 36#include "iwl-agn.h"
bdfbf092 37#include "iwl-trans.h"
2a421b91
TW		 38
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. */
fe905f1d
TW		 42#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
43#define IWL_ACTIVE_DWELL_TIME_52 (20)
44
45#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
46#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
2a421b91 47
2a421b91
TW		 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
0ed46287 55#define MAX_SCAN_CHANNEL 50
2a421b91 56
cd44600f
SG		 57static int iwl_send_scan_abort(struct iwl_priv *priv)
58{
59 int ret;
cd44600f
SG		 60 struct iwl_host_cmd cmd = {
61 .id = REPLY_SCAN_ABORT_CMD,
e419d62d 62 .flags = CMD_SYNC | CMD_WANT_SKB,
cd44600f 63 };
f8d7c1a1 64 __le32 *status;
fe905f1d 65
cd44600f
SG		 66 /* Exit instantly with error when device is not ready
67 * to receive scan abort command or it does not perform
68 * hardware scan currently */
83626404
DF		 69 if (!test_bit(STATUS_READY, &priv->status) ||
70 !test_bit(STATUS_GEO_CONFIGURED, &priv->status) ||
71 !test_bit(STATUS_SCAN_HW, &priv->status) ||
17acd0b6 72 test_bit(STATUS_FW_ERROR, &priv->status))
cd44600f 73 return -EIO;
fe905f1d 74
e10a0533 75 ret = iwl_dvm_send_cmd(priv, &cmd);
cd44600f
SG		 76 if (ret)
77 return ret;
78
f8d7c1a1
JB		 79 status = (void *)cmd.resp_pkt->data;
80 if (*status != CAN_ABORT_STATUS) {
cd44600f
SG		 81 /* The scan abort will return 1 for success or
82 * 2 for "failure". A failure condition can be
83 * due to simply not being in an active scan which
84 * can occur if we send the scan abort before we
85 * the microcode has notified us that a scan is
86 * completed. */
f8d7c1a1
JB		 87 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n",
88 le32_to_cpu(*status));
cd44600f 89 ret = -EIO;
2a421b91
TW		 90 }
91
65b94a4a 92 iwl_free_resp(&cmd);
cd44600f
SG		 93 return ret;
94}
2a421b91 95
02d8c14b
SG		 96static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
97{
98 /* check if scan was requested from mac80211 */
99 if (priv->scan_request) {
100 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
101 ieee80211_scan_completed(priv->hw, aborted);
102 }
103
c6baf7fb
JB		 104 if (priv->scan_type == IWL_SCAN_ROC) {
105 ieee80211_remain_on_channel_expired(priv->hw);
106 priv->hw_roc_channel = NULL;
107 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
108 }
109
266af4c7 110 priv->scan_type = IWL_SCAN_NORMAL;
02d8c14b
SG		 111 priv->scan_vif = NULL;
112 priv->scan_request = NULL;
113}
114
a2fa2462
JB		 115static void iwl_process_scan_complete(struct iwl_priv *priv)
116{
117 bool aborted;
118
b1eea297 119 lockdep_assert_held(&priv->mutex);
84b1bec6 120
83626404 121 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->status))
84b1bec6
JB		 122 return;
123
a2fa2462
JB		 124 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
125
126 cancel_delayed_work(&priv->scan_check);
127
83626404 128 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
a2fa2462
JB		 129 if (aborted)
130 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
131
83626404 132 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
a2fa2462
JB		 133 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
134 goto out_settings;
135 }
136
137 if (priv->scan_type == IWL_SCAN_ROC) {
138 ieee80211_remain_on_channel_expired(priv->hw);
139 priv->hw_roc_channel = NULL;
140 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
141 }
142
143 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
144 int err;
145
146 /* Check if mac80211 requested scan during our internal scan */
147 if (priv->scan_request == NULL)
148 goto out_complete;
149
150 /* If so request a new scan */
151 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
152 priv->scan_request->channels[0]->band);
153 if (err) {
154 IWL_DEBUG_SCAN(priv,
155 "failed to initiate pending scan: %d\n", err);
156 aborted = true;
157 goto out_complete;
158 }
159
160 return;
161 }
162
163out_complete:
164 iwl_complete_scan(priv, aborted);
165
166out_settings:
167 /* Can we still talk to firmware ? */
83626404 168 if (!iwl_is_ready_rf(priv))
a2fa2462
JB		 169 return;
170
171 iwlagn_post_scan(priv);
172}
173
e7e16b90 174void iwl_force_scan_end(struct iwl_priv *priv)
f5354c17 175{
b1eea297 176 lockdep_assert_held(&priv->mutex);
e7e16b90 177
83626404 178 if (!test_bit(STATUS_SCANNING, &priv->status)) {
e7e16b90
SG		 179 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
180 return;
181 }
182
f5354c17 183 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
83626404
DF		 184 clear_bit(STATUS_SCANNING, &priv->status);
185 clear_bit(STATUS_SCAN_HW, &priv->status);
186 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
187 clear_bit(STATUS_SCAN_COMPLETE, &priv->status);
f5354c17
SG		 188 iwl_complete_scan(priv, true);
189}
190
cd44600f
SG		 191static void iwl_do_scan_abort(struct iwl_priv *priv)
192{
193 int ret;
2a421b91 194
b1eea297 195 lockdep_assert_held(&priv->mutex);
cd44600f 196
83626404 197 if (!test_bit(STATUS_SCANNING, &priv->status)) {
cd44600f
SG		 198 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
199 return;
2a421b91
TW		 200 }
201
83626404 202 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
cd44600f
SG		 203 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
204 return;
205 }
206
207 ret = iwl_send_scan_abort(priv);
208 if (ret) {
209 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
f5354c17 210 iwl_force_scan_end(priv);
cd44600f 211 } else
25985edc 212 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
cd44600f
SG		 213}
214
215/**
216 * iwl_scan_cancel - Cancel any currently executing HW scan
217 */
218int iwl_scan_cancel(struct iwl_priv *priv)
219{
220 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
1ee158d8 221 queue_work(priv->workqueue, &priv->abort_scan);
2a421b91
TW		 222 return 0;
223}
cd44600f 224
2a421b91
TW		 225/**
226 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
227 * @ms: amount of time to wait (in milliseconds) for scan to abort
228 *
2a421b91 229 */
98efb4a5 230void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
2a421b91 231{
e693a802
SG		 232 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
233
b1eea297 234 lockdep_assert_held(&priv->mutex);
2a421b91 235
e693a802 236 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
2a421b91 237
e693a802
SG		 238 iwl_do_scan_abort(priv);
239
240 while (time_before_eq(jiffies, timeout)) {
83626404 241 if (!test_bit(STATUS_SCAN_HW, &priv->status))
84b1bec6 242 goto finished;
e693a802 243 msleep(20);
2a421b91 244 }
84b1bec6
JB		 245
246 return;
247
248 finished:
249 /*
250 * Now STATUS_SCAN_HW is clear. This means that the
251 * device finished, but the background work is going
252 * to execute at best as soon as we release the mutex.
253 * Since we need to be able to issue a new scan right
254 * after this function returns, run the complete here.
255 * The STATUS_SCAN_COMPLETE bit will then be cleared
256 * and prevent the background work from "completing"
257 * a possible new scan.
258 */
259 iwl_process_scan_complete(priv);
2a421b91 260}
2a421b91 261
2a421b91 262/* Service response to REPLY_SCAN_CMD (0x80) */
247c61d6 263static int iwl_rx_reply_scan(struct iwl_priv *priv,
48a2d66f 264 struct iwl_rx_cmd_buffer *rxb,
247c61d6 265 struct iwl_device_cmd *cmd)
2a421b91
TW		 266{
267#ifdef CONFIG_IWLWIFI_DEBUG
2f301227 268 struct iwl_rx_packet *pkt = rxb_addr(rxb);
f8d7c1a1 269 struct iwl_scanreq_notification *notif = (void *)pkt->data;
2a421b91 270
7cf24421 271 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
2a421b91 272#endif
247c61d6 273 return 0;
2a421b91
TW		 274}
275
276/* Service SCAN_START_NOTIFICATION (0x82) */
247c61d6 277static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
48a2d66f 278 struct iwl_rx_cmd_buffer *rxb,
247c61d6 279 struct iwl_device_cmd *cmd)
2a421b91 280{
2f301227 281 struct iwl_rx_packet *pkt = rxb_addr(rxb);
f8d7c1a1
JB		 282 struct iwl_scanstart_notification *notif = (void *)pkt->data;
283
2a421b91 284 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
e1623446 285 IWL_DEBUG_SCAN(priv, "Scan start: "
2a421b91
TW		 286 "%d [802.11%s] "
287 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
288 notif->channel,
289 notif->band ? "bg" : "a",
fe905f1d
TW		 290 le32_to_cpu(notif->tsf_high),
291 le32_to_cpu(notif->tsf_low),
292 notif->status, notif->beacon_timer);
c6baf7fb 293
390808db
JB		 294 if (priv->scan_type == IWL_SCAN_ROC &&
295 !priv->hw_roc_start_notified) {
c6baf7fb 296 ieee80211_ready_on_channel(priv->hw);
390808db
JB		 297 priv->hw_roc_start_notified = true;
298 }
247c61d6
EG		 299
300 return 0;
2a421b91
TW		 301}
302
303/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
247c61d6 304static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
48a2d66f 305 struct iwl_rx_cmd_buffer *rxb,
247c61d6 306 struct iwl_device_cmd *cmd)
2a421b91
TW		 307{
308#ifdef CONFIG_IWLWIFI_DEBUG
2f301227 309 struct iwl_rx_packet *pkt = rxb_addr(rxb);
f8d7c1a1 310 struct iwl_scanresults_notification *notif = (void *)pkt->data;
2a421b91 311
e1623446 312 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
2a421b91 313 "%d [802.11%s] "
1895b36b 314 "probe status: %u:%u "
2a421b91 315 "(TSF: 0x%08X:%08X) - %d "
220575f7 316 "elapsed=%lu usec\n",
2a421b91
TW		 317 notif->channel,
318 notif->band ? "bg" : "a",
1895b36b 319 notif->probe_status, notif->num_probe_not_sent,
2a421b91
TW		 320 le32_to_cpu(notif->tsf_high),
321 le32_to_cpu(notif->tsf_low),
322 le32_to_cpu(notif->statistics[0]),
220575f7 323 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
2a421b91 324#endif
247c61d6 325 return 0;
2a421b91
TW		 326}
327
328/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
247c61d6 329static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
48a2d66f 330 struct iwl_rx_cmd_buffer *rxb,
247c61d6 331 struct iwl_device_cmd *cmd)
2a421b91 332{
2f301227 333 struct iwl_rx_packet *pkt = rxb_addr(rxb);
f8d7c1a1 334 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->data;
2a421b91 335
e1623446 336 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
2a421b91
TW		 337 scan_notif->scanned_channels,
338 scan_notif->tsf_low,
339 scan_notif->tsf_high, scan_notif->status);
340
7cf24421 341 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
00700ee0 342 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
ef1b21f7 343 jiffies_to_msecs(jiffies - priv->scan_start));
2a421b91 344
84b1bec6
JB		 345 /*
346 * When aborting, we run the scan completed background work inline
347 * and the background work must then do nothing. The SCAN_COMPLETE
348 * bit helps implement that logic and thus needs to be set before
349 * queueing the work. Also, since the scan abort waits for SCAN_HW
350 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
351 * to avoid a race there.
352 */
83626404
DF		 353 set_bit(STATUS_SCAN_COMPLETE, &priv->status);
354 clear_bit(STATUS_SCAN_HW, &priv->status);
1ee158d8 355 queue_work(priv->workqueue, &priv->scan_completed);
2a421b91 356
f78e5454 357 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
88e58fc5 358 iwl_advanced_bt_coexist(priv) &&
d5926d9d 359 priv->bt_status != scan_notif->bt_status) {
f78e5454
WYG		 360 if (scan_notif->bt_status) {
361 /* BT on */
362 if (!priv->bt_ch_announce)
363 priv->bt_traffic_load =
364 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
365 /*
366 * otherwise, no traffic load information provided
367 * no changes made
368 */
369 } else {
370 /* BT off */
371 priv->bt_traffic_load =
372 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
373 }
374 priv->bt_status = scan_notif->bt_status;
1ee158d8 375 queue_work(priv->workqueue,
74e28e44 376 &priv->bt_traffic_change_work);
f78e5454 377 }
247c61d6 378 return 0;
2a421b91
TW		 379}
380
381void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
382{
383 /* scan handlers */
384 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
385 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
386 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
387 iwl_rx_scan_results_notif;
388 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
389 iwl_rx_scan_complete_notif;
390}
2a421b91 391
6e809a16
JB		 392static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
393 enum ieee80211_band band, u8 n_probes)
2a421b91
TW		 394{
395 if (band == IEEE80211_BAND_5GHZ)
fe905f1d
TW		 396 return IWL_ACTIVE_DWELL_TIME_52 +
397 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
2a421b91 398 else
fe905f1d
TW		 399 return IWL_ACTIVE_DWELL_TIME_24 +
400 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
2a421b91
TW		 401}
402
390808db
JB		 403static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
404{
405 struct iwl_rxon_context *ctx;
406
407 /*
408 * If we're associated, we clamp the dwell time 98%
409 * of the smallest beacon interval (minus 2 * channel
410 * tune time)
411 */
412 for_each_context(priv, ctx) {
413 u16 value;
414
2ed81710
JB		 415 switch (ctx->staging.dev_type) {
416 case RXON_DEV_TYPE_P2P:
417 /* no timing constraints */
eb32043f 418 continue;
2ed81710
JB		 419 case RXON_DEV_TYPE_ESS:
420 default:
421 /* timing constraints if associated */
422 if (!iwl_is_associated_ctx(ctx))
423 continue;
424 break;
425 case RXON_DEV_TYPE_CP:
426 case RXON_DEV_TYPE_2STA:
427 /*
428 * These seem to always have timers for TBTT
429 * active in uCode even when not associated yet.
430 */
431 break;
432 }
433
390808db
JB		 434 value = ctx->beacon_int;
435 if (!value)
436 value = IWL_PASSIVE_DWELL_BASE;
437 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
438 dwell_time = min(value, dwell_time);
439 }
440
441 return dwell_time;
442}
443
6e809a16
JB		 444static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
445 enum ieee80211_band band)
2a421b91 446{
fe905f1d 447 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
2a421b91
TW		 448 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
449 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
450
390808db 451 return iwl_limit_dwell(priv, passive);
2a421b91
TW		 452}
453
c736f235
MV		 454/* Return valid, unused, channel for a passive scan to reset the RF */
455static u8 iwl_get_single_channel_number(struct iwl_priv *priv,
456 enum ieee80211_band band)
457{
458 const struct iwl_channel_info *ch_info;
459 int i;
460 u8 channel = 0;
461 u8 min, max;
462 struct iwl_rxon_context *ctx;
463
464 if (band == IEEE80211_BAND_5GHZ) {
465 min = 14;
466 max = priv->channel_count;
467 } else {
468 min = 0;
469 max = 14;
470 }
471
472 for (i = min; i < max; i++) {
473 bool busy = false;
474
475 for_each_context(priv, ctx) {
476 busy = priv->channel_info[i].channel ==
477 le16_to_cpu(ctx->staging.channel);
478 if (busy)
479 break;
480 }
481
482 if (busy)
483 continue;
484
485 channel = priv->channel_info[i].channel;
486 ch_info = iwl_get_channel_info(priv, band, channel);
487 if (is_channel_valid(ch_info))
488 break;
489 }
490
491 return channel;
492}
493
6e809a16
JB		 494static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
495 struct ieee80211_vif *vif,
496 enum ieee80211_band band,
497 struct iwl_scan_channel *scan_ch)
498{
499 const struct ieee80211_supported_band *sband;
500 u16 passive_dwell = 0;
501 u16 active_dwell = 0;
502 int added = 0;
503 u16 channel = 0;
504
505 sband = iwl_get_hw_mode(priv, band);
506 if (!sband) {
507 IWL_ERR(priv, "invalid band\n");
508 return added;
509 }
510
511 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
512 passive_dwell = iwl_get_passive_dwell_time(priv, band);
513
514 if (passive_dwell <= active_dwell)
515 passive_dwell = active_dwell + 1;
516
517 channel = iwl_get_single_channel_number(priv, band);
518 if (channel) {
519 scan_ch->channel = cpu_to_le16(channel);
520 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
521 scan_ch->active_dwell = cpu_to_le16(active_dwell);
522 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
523 /* Set txpower levels to defaults */
524 scan_ch->dsp_atten = 110;
525 if (band == IEEE80211_BAND_5GHZ)
526 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
527 else
528 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
529 added++;
530 } else
531 IWL_ERR(priv, "no valid channel found\n");
532 return added;
533}
534
535static int iwl_get_channels_for_scan(struct iwl_priv *priv,
536 struct ieee80211_vif *vif,
537 enum ieee80211_band band,
538 u8 is_active, u8 n_probes,
539 struct iwl_scan_channel *scan_ch)
540{
541 struct ieee80211_channel *chan;
542 const struct ieee80211_supported_band *sband;
543 const struct iwl_channel_info *ch_info;
544 u16 passive_dwell = 0;
545 u16 active_dwell = 0;
546 int added, i;
547 u16 channel;
548
549 sband = iwl_get_hw_mode(priv, band);
550 if (!sband)
551 return 0;
552
553 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
554 passive_dwell = iwl_get_passive_dwell_time(priv, band);
555
556 if (passive_dwell <= active_dwell)
557 passive_dwell = active_dwell + 1;
558
559 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
560 chan = priv->scan_request->channels[i];
561
562 if (chan->band != band)
563 continue;
564
565 channel = chan->hw_value;
566 scan_ch->channel = cpu_to_le16(channel);
567
568 ch_info = iwl_get_channel_info(priv, band, channel);
569 if (!is_channel_valid(ch_info)) {
570 IWL_DEBUG_SCAN(priv,
571 "Channel %d is INVALID for this band.\n",
572 channel);
573 continue;
574 }
575
576 if (!is_active || is_channel_passive(ch_info) ||
577 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
578 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
579 else
580 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
581
582 if (n_probes)
583 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
584
585 scan_ch->active_dwell = cpu_to_le16(active_dwell);
586 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
587
588 /* Set txpower levels to defaults */
589 scan_ch->dsp_atten = 110;
590
591 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
592 * power level:
593 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
594 */
595 if (band == IEEE80211_BAND_5GHZ)
596 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
597 else
598 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
599
600 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
601 channel, le32_to_cpu(scan_ch->type),
602 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
603 "ACTIVE" : "PASSIVE",
604 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
605 active_dwell : passive_dwell);
606
607 scan_ch++;
608 added++;
609 }
610
611 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
612 return added;
613}
614
b443d8d8
JB		 615/**
616 * iwl_fill_probe_req - fill in all required fields and IE for probe request
617 */
618
619static u16 iwl_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
4f9bfbb1
DS		 620 const u8 *ies, int ie_len, const u8 *ssid,
621 u8 ssid_len, int left)
b443d8d8
JB		 622{
623 int len = 0;
624 u8 *pos = NULL;
625
626 /* Make sure there is enough space for the probe request,
627 * two mandatory IEs and the data */
628 left -= 24;
629 if (left < 0)
630 return 0;
631
632 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
633 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
634 memcpy(frame->sa, ta, ETH_ALEN);
635 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
636 frame->seq_ctrl = 0;
637
638 len += 24;
639
640 /* ...next IE... */
641 pos = &frame->u.probe_req.variable[0];
642
4f9bfbb1
DS		 643 /* fill in our SSID IE */
644 left -= ssid_len + 2;
b443d8d8
JB		 645 if (left < 0)
646 return 0;
647 *pos++ = WLAN_EID_SSID;
4f9bfbb1
DS		 648 *pos++ = ssid_len;
649 if (ssid && ssid_len) {
650 memcpy(pos, ssid, ssid_len);
651 pos += ssid_len;
652 }
b443d8d8 653
4f9bfbb1 654 len += ssid_len + 2;
b443d8d8
JB		 655
656 if (WARN_ON(left < ie_len))
657 return len;
658
659 if (ies && ie_len) {
660 memcpy(pos, ies, ie_len);
661 len += ie_len;
662 }
663
664 return (u16)len;
665}
666
6e809a16
JB		 667static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
668{
669 struct iwl_host_cmd cmd = {
670 .id = REPLY_SCAN_CMD,
671 .len = { sizeof(struct iwl_scan_cmd), },
672 .flags = CMD_SYNC,
673 };
674 struct iwl_scan_cmd *scan;
675 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
676 u32 rate_flags = 0;
331d9301 677 u16 cmd_len = 0;
6e809a16
JB		 678 u16 rx_chain = 0;
679 enum ieee80211_band band;
680 u8 n_probes = 0;
9e295116 681 u8 rx_ant = priv->hw_params.valid_rx_ant;
6e809a16
JB		 682 u8 rate;
683 bool is_active = false;
684 int chan_mod;
685 u8 active_chains;
9e295116 686 u8 scan_tx_antennas = priv->hw_params.valid_tx_ant;
6e809a16 687 int ret;
0ed46287
DS		 688 int scan_cmd_size = sizeof(struct iwl_scan_cmd) +
689 MAX_SCAN_CHANNEL * sizeof(struct iwl_scan_channel) +
690 priv->fw->ucode_capa.max_probe_length;
4f9bfbb1
DS		 691 const u8 *ssid = NULL;
692 u8 ssid_len = 0;
0ed46287
DS		 693
694 if (WARN_ON_ONCE(priv->scan_request &&
695 priv->scan_request->n_channels > MAX_SCAN_CHANNEL))
696 return -EINVAL;
6e809a16 697
b1eea297 698 lockdep_assert_held(&priv->mutex);
6e809a16
JB		 699
700 if (vif)
701 ctx = iwl_rxon_ctx_from_vif(vif);
702
703 if (!priv->scan_cmd) {
0ed46287 704 priv->scan_cmd = kmalloc(scan_cmd_size, GFP_KERNEL);
6e809a16
JB		 705 if (!priv->scan_cmd) {
706 IWL_DEBUG_SCAN(priv,
707 "fail to allocate memory for scan\n");
708 return -ENOMEM;
709 }
710 }
711 scan = priv->scan_cmd;
0ed46287 712 memset(scan, 0, scan_cmd_size);
6e809a16
JB		 713
714 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
715 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
716
717 if (priv->scan_type != IWL_SCAN_ROC &&
718 iwl_is_any_associated(priv)) {
719 u16 interval = 0;
720 u32 extra;
721 u32 suspend_time = 100;
722 u32 scan_suspend_time = 100;
723
724 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
725 switch (priv->scan_type) {
726 case IWL_SCAN_ROC:
727 WARN_ON(1);
728 break;
729 case IWL_SCAN_RADIO_RESET:
730 interval = 0;
731 break;
732 case IWL_SCAN_NORMAL:
733 interval = vif->bss_conf.beacon_int;
734 break;
735 }
736
737 scan->suspend_time = 0;
738 scan->max_out_time = cpu_to_le32(200 * 1024);
739 if (!interval)
740 interval = suspend_time;
741
742 extra = (suspend_time / interval) << 22;
743 scan_suspend_time = (extra |
744 ((suspend_time % interval) * 1024));
745 scan->suspend_time = cpu_to_le32(scan_suspend_time);
746 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
747 scan_suspend_time, interval);
748 } else if (priv->scan_type == IWL_SCAN_ROC) {
749 scan->suspend_time = 0;
750 scan->max_out_time = 0;
751 scan->quiet_time = 0;
752 scan->quiet_plcp_th = 0;
753 }
754
755 switch (priv->scan_type) {
756 case IWL_SCAN_RADIO_RESET:
757 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
758 break;
759 case IWL_SCAN_NORMAL:
760 if (priv->scan_request->n_ssids) {
761 int i, p = 0;
762 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
4f9bfbb1
DS		 763 /*
764 * The highest priority SSID is inserted to the
765 * probe request template.
766 */
767 ssid_len = priv->scan_request->ssids[0].ssid_len;
768 ssid = priv->scan_request->ssids[0].ssid;
769
65781af6
DS		 770 /*
771 * Invert the order of ssids, the firmware will invert
772 * it back.
773 */
774 for (i = priv->scan_request->n_ssids - 1; i >= 1; i--) {
6e809a16
JB		 775 scan->direct_scan[p].id = WLAN_EID_SSID;
776 scan->direct_scan[p].len =
777 priv->scan_request->ssids[i].ssid_len;
778 memcpy(scan->direct_scan[p].ssid,
779 priv->scan_request->ssids[i].ssid,
780 priv->scan_request->ssids[i].ssid_len);
781 n_probes++;
782 p++;
783 }
784 is_active = true;
785 } else
786 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
787 break;
788 case IWL_SCAN_ROC:
789 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
790 break;
791 }
792
793 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
794 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
795 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
796
797 switch (priv->scan_band) {
798 case IEEE80211_BAND_2GHZ:
799 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
800 chan_mod = le32_to_cpu(
801 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
802 RXON_FLG_CHANNEL_MODE_MSK)
803 >> RXON_FLG_CHANNEL_MODE_POS;
3a8aea09
JB		 804 if ((priv->scan_request && priv->scan_request->no_cck) ||
805 chan_mod == CHANNEL_MODE_PURE_40) {
6e809a16
JB		 806 rate = IWL_RATE_6M_PLCP;
807 } else {
808 rate = IWL_RATE_1M_PLCP;
809 rate_flags = RATE_MCS_CCK_MSK;
810 }
811 /*
812 * Internal scans are passive, so we can indiscriminately set
813 * the BT ignore flag on 2.4 GHz since it applies to TX only.
814 */
2152268f
EG		 815 if (priv->cfg->bt_params &&
816 priv->cfg->bt_params->advanced_bt_coexist)
6e809a16
JB		 817 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
818 break;
819 case IEEE80211_BAND_5GHZ:
820 rate = IWL_RATE_6M_PLCP;
821 break;
822 default:
823 IWL_WARN(priv, "Invalid scan band\n");
824 return -EIO;
825 }
826
827 /*
828 * If active scanning is requested but a certain channel is
829 * marked passive, we can do active scanning if we detect
830 * transmissions.
831 *
832 * There is an issue with some firmware versions that triggers
833 * a sysassert on a "good CRC threshold" of zero (== disabled),
834 * on a radar channel even though this means that we should NOT
835 * send probes.
836 *
837 * The "good CRC threshold" is the number of frames that we
838 * need to receive during our dwell time on a channel before
839 * sending out probes -- setting this to a huge value will
840 * mean we never reach it, but at the same time work around
841 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
842 * here instead of IWL_GOOD_CRC_TH_DISABLED.
843 *
844 * This was fixed in later versions along with some other
845 * scan changes, and the threshold behaves as a flag in those
846 * versions.
847 */
848 if (priv->new_scan_threshold_behaviour)
849 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
850 IWL_GOOD_CRC_TH_DISABLED;
851 else
852 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
853 IWL_GOOD_CRC_TH_NEVER;
854
855 band = priv->scan_band;
856
6e809a16 857 if (band == IEEE80211_BAND_2GHZ &&
2152268f
EG		 858 priv->cfg->bt_params &&
859 priv->cfg->bt_params->advanced_bt_coexist) {
6e809a16
JB		 860 /* transmit 2.4 GHz probes only on first antenna */
861 scan_tx_antennas = first_antenna(scan_tx_antennas);
862 }
863
864 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
865 priv->scan_tx_ant[band],
866 scan_tx_antennas);
867 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
868 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
869
e5610382
JB		 870 /*
871 * In power save mode while associated use one chain,
872 * otherwise use all chains
873 */
47107e84 874 if (test_bit(STATUS_POWER_PMI, &priv->status) &&
e5610382 875 !(priv->hw->conf.flags & IEEE80211_CONF_IDLE)) {
6e809a16
JB		 876 /* rx_ant has been set to all valid chains previously */
877 active_chains = rx_ant &
878 ((u8)(priv->chain_noise_data.active_chains));
879 if (!active_chains)
880 active_chains = rx_ant;
881
882 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
883 priv->chain_noise_data.active_chains);
884
885 rx_ant = first_antenna(active_chains);
886 }
2152268f
EG		 887 if (priv->cfg->bt_params &&
888 priv->cfg->bt_params->advanced_bt_coexist &&
6e809a16
JB		 889 priv->bt_full_concurrent) {
890 /* operated as 1x1 in full concurrency mode */
891 rx_ant = first_antenna(rx_ant);
892 }
893
894 /* MIMO is not used here, but value is required */
895 rx_chain |=
9e295116 896 priv->hw_params.valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
6e809a16
JB		 897 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
898 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
899 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
900 scan->rx_chain = cpu_to_le16(rx_chain);
901 switch (priv->scan_type) {
902 case IWL_SCAN_NORMAL:
b443d8d8 903 cmd_len = iwl_fill_probe_req(
6e809a16
JB		 904 (struct ieee80211_mgmt *)scan->data,
905 vif->addr,
906 priv->scan_request->ie,
907 priv->scan_request->ie_len,
4f9bfbb1 908 ssid, ssid_len,
0ed46287 909 scan_cmd_size - sizeof(*scan));
6e809a16
JB		 910 break;
911 case IWL_SCAN_RADIO_RESET:
912 case IWL_SCAN_ROC:
913 /* use bcast addr, will not be transmitted but must be valid */
b443d8d8 914 cmd_len = iwl_fill_probe_req(
6e809a16
JB		 915 (struct ieee80211_mgmt *)scan->data,
916 iwl_bcast_addr, NULL, 0,
4f9bfbb1 917 NULL, 0,
0ed46287 918 scan_cmd_size - sizeof(*scan));
6e809a16
JB		 919 break;
920 default:
921 BUG();
922 }
923 scan->tx_cmd.len = cpu_to_le16(cmd_len);
924
925 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
926 RXON_FILTER_BCON_AWARE_MSK);
927
928 switch (priv->scan_type) {
929 case IWL_SCAN_RADIO_RESET:
930 scan->channel_count =
931 iwl_get_single_channel_for_scan(priv, vif, band,
932 (void *)&scan->data[cmd_len]);
933 break;
934 case IWL_SCAN_NORMAL:
935 scan->channel_count =
936 iwl_get_channels_for_scan(priv, vif, band,
937 is_active, n_probes,
938 (void *)&scan->data[cmd_len]);
939 break;
940 case IWL_SCAN_ROC: {
941 struct iwl_scan_channel *scan_ch;
390808db
JB		 942 int n_chan, i;
943 u16 dwell;
944
945 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
946 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
6e809a16 947
390808db 948 scan->channel_count = n_chan;
6e809a16
JB		 949
950 scan_ch = (void *)&scan->data[cmd_len];
6e809a16 951
390808db
JB		 952 for (i = 0; i < n_chan; i++) {
953 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
954 scan_ch->channel =
955 cpu_to_le16(priv->hw_roc_channel->hw_value);
6e809a16 956
390808db
JB		 957 if (i == n_chan - 1)
958 dwell = priv->hw_roc_duration - i * dwell;
959
960 scan_ch->active_dwell =
961 scan_ch->passive_dwell = cpu_to_le16(dwell);
962
963 /* Set txpower levels to defaults */
964 scan_ch->dsp_atten = 110;
965
966 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
967 * power level:
968 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
969 */
970 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
971 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
972 else
973 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
974
975 scan_ch++;
6e809a16 976 }
390808db
JB		 977 }
978
6e809a16
JB		 979 break;
980 }
981
982 if (scan->channel_count == 0) {
983 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
984 return -EIO;
985 }
986
987 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
988 scan->channel_count * sizeof(struct iwl_scan_channel);
989 cmd.data[0] = scan;
990 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
991 scan->len = cpu_to_le16(cmd.len[0]);
992
993 /* set scan bit here for PAN params */
83626404 994 set_bit(STATUS_SCAN_HW, &priv->status);
6e809a16
JB		 995
996 ret = iwlagn_set_pan_params(priv);
997 if (ret)
998 return ret;
999
e10a0533 1000 ret = iwl_dvm_send_cmd(priv, &cmd);
6e809a16 1001 if (ret) {
83626404 1002 clear_bit(STATUS_SCAN_HW, &priv->status);
6e809a16
JB		 1003 iwlagn_set_pan_params(priv);
1004 }
1005
1006 return ret;
1007}
1008
f53696de
TW		 1009void iwl_init_scan_params(struct iwl_priv *priv)
1010{
9e295116 1011 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
f53696de 1012 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
76eff18b 1013 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
f53696de 1014 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
76eff18b 1015 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
f53696de
TW		 1016}
1017
266af4c7
JB		 1018int __must_check iwl_scan_initiate(struct iwl_priv *priv,
1019 struct ieee80211_vif *vif,
1020 enum iwl_scan_type scan_type,
1021 enum ieee80211_band band)
2a421b91 1022{
3eecce52
JB		 1023 int ret;
1024
b1eea297 1025 lockdep_assert_held(&priv->mutex);
88be0264 1026
3eecce52
JB		 1027 cancel_delayed_work(&priv->scan_check);
1028
83626404 1029 if (!iwl_is_ready_rf(priv)) {
7cf24421 1030 IWL_WARN(priv, "Request scan called when driver not ready.\n");
3eecce52
JB		 1031 return -EIO;
1032 }
1033
83626404 1034 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
7cf24421 1035 IWL_DEBUG_SCAN(priv,
3eecce52
JB		 1036 "Multiple concurrent scan requests in parallel.\n");
1037 return -EBUSY;
1038 }
1039
83626404 1040 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
7cf24421 1041 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
3eecce52
JB		 1042 return -EBUSY;
1043 }
1044
7cf24421 1045 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
266af4c7 1046 scan_type == IWL_SCAN_NORMAL ? "" :
c6baf7fb 1047 scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
266af4c7 1048 "internal short ");
3eecce52 1049
83626404 1050 set_bit(STATUS_SCANNING, &priv->status);
266af4c7 1051 priv->scan_type = scan_type;
2a421b91 1052 priv->scan_start = jiffies;
3eecce52 1053 priv->scan_band = band;
2a421b91 1054
5c3d29fc 1055 ret = iwlagn_request_scan(priv, vif);
3eecce52 1056 if (ret) {
83626404 1057 clear_bit(STATUS_SCANNING, &priv->status);
266af4c7 1058 priv->scan_type = IWL_SCAN_NORMAL;
3eecce52
JB		 1059 return ret;
1060 }
b6e4c55a 1061
1ee158d8 1062 queue_delayed_work(priv->workqueue, &priv->scan_check,
3eecce52 1063 IWL_SCAN_CHECK_WATCHDOG);
2a421b91
TW		 1064
1065 return 0;
1066}
2a421b91 1067
e9dde6f6 1068
afbdd69a
WYG		 1069/*
1070 * internal short scan, this function should only been called while associated.
1071 * It will reset and tune the radio to prevent possible RF related problem
1072 */
88be0264 1073void iwl_internal_short_hw_scan(struct iwl_priv *priv)
afbdd69a 1074{
1ee158d8 1075 queue_work(priv->workqueue, &priv->start_internal_scan);
88be0264
JB		 1076}
1077
c240879f 1078static void iwl_bg_start_internal_scan(struct work_struct *work)
88be0264
JB		 1079{
1080 struct iwl_priv *priv =
1081 container_of(work, struct iwl_priv, start_internal_scan);
1082
7cf24421
SG		 1083 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
1084
b1eea297 1085 mutex_lock(&priv->mutex);
afbdd69a 1086
266af4c7 1087 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
073d5eab
RC		 1088 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
1089 goto unlock;
1090 }
1091
83626404 1092 if (test_bit(STATUS_SCANNING, &priv->status)) {
afbdd69a 1093 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
88be0264 1094 goto unlock;
afbdd69a 1095 }
88be0264 1096
266af4c7 1097 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
3eecce52 1098 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
88be0264 1099 unlock:
b1eea297 1100 mutex_unlock(&priv->mutex);
afbdd69a 1101}
afbdd69a 1102
c240879f 1103static void iwl_bg_scan_check(struct work_struct *data)
2a421b91
TW		 1104{
1105 struct iwl_priv *priv =
1106 container_of(data, struct iwl_priv, scan_check.work);
1107
7cf24421
SG		 1108 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1109
e7e16b90
SG		 1110 /* Since we are here firmware does not finish scan and
1111 * most likely is in bad shape, so we don't bother to
1112 * send abort command, just force scan complete to mac80211 */
b1eea297 1113 mutex_lock(&priv->mutex);
e7e16b90 1114 iwl_force_scan_end(priv);
b1eea297 1115 mutex_unlock(&priv->mutex);
2a421b91 1116}
77fecfb8 1117
c240879f 1118static void iwl_bg_abort_scan(struct work_struct *work)
2a421b91
TW		 1119{
1120 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1121
7cf24421
SG		 1122 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1123
e7e16b90
SG		 1124 /* We keep scan_check work queued in case when firmware will not
1125 * report back scan completed notification */
b1eea297 1126 mutex_lock(&priv->mutex);
6bd1758d 1127 iwl_scan_cancel_timeout(priv, 200);
b1eea297 1128 mutex_unlock(&priv->mutex);
2a421b91
TW		 1129}
1130
f253247a
JB		 1131static void iwl_bg_scan_completed(struct work_struct *work)
1132{
1133 struct iwl_priv *priv =
1134 container_of(work, struct iwl_priv, scan_completed);
52a02d15 1135
b1eea297 1136 mutex_lock(&priv->mutex);
f253247a 1137 iwl_process_scan_complete(priv);
b1eea297 1138 mutex_unlock(&priv->mutex);
eedda367 1139}
eedda367 1140
2a421b91
TW		 1141void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1142{
eedda367 1143 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
2a421b91 1144 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
88be0264 1145 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
2a421b91
TW		 1146 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1147}
2a421b91 1148
e7e16b90
SG		 1149void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1150{
1151 cancel_work_sync(&priv->start_internal_scan);
1152 cancel_work_sync(&priv->abort_scan);
1153 cancel_work_sync(&priv->scan_completed);
1154
1155 if (cancel_delayed_work_sync(&priv->scan_check)) {
b1eea297 1156 mutex_lock(&priv->mutex);
e7e16b90 1157 iwl_force_scan_end(priv);
b1eea297 1158 mutex_unlock(&priv->mutex);
e7e16b90
SG		 1159 }
1160}
kernel source for telekom puls (alcatel/mediatek)