?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
iwlagn: rename all the mac80211 callback functions
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
blob55f1f86796a632541dd08ea18763011723144098
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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:
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/slab.h>
29 #include <linux/types.h>
30 #include <linux/etherdevice.h>
31 #include <net/mac80211.h>
32
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"
39 #include "iwl-agn.h"
40 #include "iwl-trans.h"
41
42 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
43 * sending probe req. This should be set long enough to hear probe responses
44 * from more than one AP. */
45 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
46 #define IWL_ACTIVE_DWELL_TIME_52 (20)
47
48 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
49 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
50
51 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
52 * Must be set longer than active dwell time.
53 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
54 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
55 #define IWL_PASSIVE_DWELL_TIME_52 (10)
56 #define IWL_PASSIVE_DWELL_BASE (100)
57 #define IWL_CHANNEL_TUNE_TIME 5
58
59 static int iwl_send_scan_abort(struct iwl_priv *priv)
60 {
61 int ret;
62 struct iwl_rx_packet *pkt;
63 struct iwl_host_cmd cmd = {
64 .id = REPLY_SCAN_ABORT_CMD,
65 .flags = CMD_SYNC | CMD_WANT_SKB,
66 };
67
68 /* Exit instantly with error when device is not ready
69 * to receive scan abort command or it does not perform
70 * hardware scan currently */
71 if (!test_bit(STATUS_READY, &priv->shrd->status) ||
72 !test_bit(STATUS_GEO_CONFIGURED, &priv->shrd->status) ||
73 !test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
74 test_bit(STATUS_FW_ERROR, &priv->shrd->status) ||
75 test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
76 return -EIO;
77
78 ret = iwl_trans_send_cmd(trans(priv), &cmd);
79 if (ret)
80 return ret;
81
82 pkt = (struct iwl_rx_packet *)cmd.reply_page;
83 if (pkt->u.status != CAN_ABORT_STATUS) {
84 /* The scan abort will return 1 for success or
85 * 2 for "failure". A failure condition can be
86 * due to simply not being in an active scan which
87 * can occur if we send the scan abort before we
88 * the microcode has notified us that a scan is
89 * completed. */
90 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
91 ret = -EIO;
92 }
93
94 iwl_free_pages(priv->shrd, cmd.reply_page);
95 return ret;
96 }
97
98 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
99 {
100 /* check if scan was requested from mac80211 */
101 if (priv->scan_request) {
102 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
103 ieee80211_scan_completed(priv->hw, aborted);
104 }
105
106 if (priv->scan_type == IWL_SCAN_ROC) {
107 ieee80211_remain_on_channel_expired(priv->hw);
108 priv->hw_roc_channel = NULL;
109 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
110 }
111
112 priv->scan_type = IWL_SCAN_NORMAL;
113 priv->scan_vif = NULL;
114 priv->scan_request = NULL;
115 }
116
117 static void iwl_process_scan_complete(struct iwl_priv *priv)
118 {
119 bool aborted;
120
121 lockdep_assert_held(&priv->shrd->mutex);
122
123 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status))
124 return;
125
126 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
127
128 cancel_delayed_work(&priv->scan_check);
129
130 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
131 if (aborted)
132 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
133
134 if (!test_and_clear_bit(STATUS_SCANNING, &priv->shrd->status)) {
135 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
136 goto out_settings;
137 }
138
139 if (priv->scan_type == IWL_SCAN_ROC) {
140 ieee80211_remain_on_channel_expired(priv->hw);
141 priv->hw_roc_channel = NULL;
142 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
143 }
144
145 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
146 int err;
147
148 /* Check if mac80211 requested scan during our internal scan */
149 if (priv->scan_request == NULL)
150 goto out_complete;
151
152 /* If so request a new scan */
153 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
154 priv->scan_request->channels[0]->band);
155 if (err) {
156 IWL_DEBUG_SCAN(priv,
157 "failed to initiate pending scan: %d\n", err);
158 aborted = true;
159 goto out_complete;
160 }
161
162 return;
163 }
164
165 out_complete:
166 iwl_complete_scan(priv, aborted);
167
168 out_settings:
169 /* Can we still talk to firmware ? */
170 if (!iwl_is_ready_rf(priv->shrd))
171 return;
172
173 iwlagn_post_scan(priv);
174 }
175
176 void iwl_force_scan_end(struct iwl_priv *priv)
177 {
178 lockdep_assert_held(&priv->shrd->mutex);
179
180 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
181 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
182 return;
183 }
184
185 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
186 clear_bit(STATUS_SCANNING, &priv->shrd->status);
187 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
188 clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
189 clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
190 iwl_complete_scan(priv, true);
191 }
192
193 static void iwl_do_scan_abort(struct iwl_priv *priv)
194 {
195 int ret;
196
197 lockdep_assert_held(&priv->shrd->mutex);
198
199 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
200 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
201 return;
202 }
203
204 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
205 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
206 return;
207 }
208
209 ret = iwl_send_scan_abort(priv);
210 if (ret) {
211 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
212 iwl_force_scan_end(priv);
213 } else
214 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
215 }
216
217 /**
218 * iwl_scan_cancel - Cancel any currently executing HW scan
219 */
220 int iwl_scan_cancel(struct iwl_priv *priv)
221 {
222 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
223 queue_work(priv->shrd->workqueue, &priv->abort_scan);
224 return 0;
225 }
226
227 /**
228 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
229 * @ms: amount of time to wait (in milliseconds) for scan to abort
230 *
231 */
232 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
233 {
234 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
235
236 lockdep_assert_held(&priv->shrd->mutex);
237
238 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
239
240 iwl_do_scan_abort(priv);
241
242 while (time_before_eq(jiffies, timeout)) {
243 if (!test_bit(STATUS_SCAN_HW, &priv->shrd->status))
244 goto finished;
245 msleep(20);
246 }
247
248 return;
249
250 finished:
251 /*
252 * Now STATUS_SCAN_HW is clear. This means that the
253 * device finished, but the background work is going
254 * to execute at best as soon as we release the mutex.
255 * Since we need to be able to issue a new scan right
256 * after this function returns, run the complete here.
257 * The STATUS_SCAN_COMPLETE bit will then be cleared
258 * and prevent the background work from "completing"
259 * a possible new scan.
260 */
261 iwl_process_scan_complete(priv);
262 }
263
264 /* Service response to REPLY_SCAN_CMD (0x80) */
265 static int iwl_rx_reply_scan(struct iwl_priv *priv,
266 struct iwl_rx_mem_buffer *rxb,
267 struct iwl_device_cmd *cmd)
268 {
269 #ifdef CONFIG_IWLWIFI_DEBUG
270 struct iwl_rx_packet *pkt = rxb_addr(rxb);
271 struct iwl_scanreq_notification *notif =
272 (struct iwl_scanreq_notification *)pkt->u.raw;
273
274 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
275 #endif
276 return 0;
277 }
278
279 /* Service SCAN_START_NOTIFICATION (0x82) */
280 static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
281 struct iwl_rx_mem_buffer *rxb,
282 struct iwl_device_cmd *cmd)
283 {
284 struct iwl_rx_packet *pkt = rxb_addr(rxb);
285 struct iwl_scanstart_notification *notif =
286 (struct iwl_scanstart_notification *)pkt->u.raw;
287 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
288 IWL_DEBUG_SCAN(priv, "Scan start: "
289 "%d [802.11%s] "
290 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
291 notif->channel,
292 notif->band ? "bg" : "a",
293 le32_to_cpu(notif->tsf_high),
294 le32_to_cpu(notif->tsf_low),
295 notif->status, notif->beacon_timer);
296
297 if (priv->scan_type == IWL_SCAN_ROC &&
298 !priv->hw_roc_start_notified) {
299 ieee80211_ready_on_channel(priv->hw);
300 priv->hw_roc_start_notified = true;
301 }
302
303 return 0;
304 }
305
306 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
307 static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
308 struct iwl_rx_mem_buffer *rxb,
309 struct iwl_device_cmd *cmd)
310 {
311 #ifdef CONFIG_IWLWIFI_DEBUG
312 struct iwl_rx_packet *pkt = rxb_addr(rxb);
313 struct iwl_scanresults_notification *notif =
314 (struct iwl_scanresults_notification *)pkt->u.raw;
315
316 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
317 "%d [802.11%s] "
318 "probe status: %u:%u "
319 "(TSF: 0x%08X:%08X) - %d "
320 "elapsed=%lu usec\n",
321 notif->channel,
322 notif->band ? "bg" : "a",
323 notif->probe_status, notif->num_probe_not_sent,
324 le32_to_cpu(notif->tsf_high),
325 le32_to_cpu(notif->tsf_low),
326 le32_to_cpu(notif->statistics[0]),
327 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
328 #endif
329 return 0;
330 }
331
332 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
333 static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
334 struct iwl_rx_mem_buffer *rxb,
335 struct iwl_device_cmd *cmd)
336 {
337 struct iwl_rx_packet *pkt = rxb_addr(rxb);
338 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
339
340 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
341 scan_notif->scanned_channels,
342 scan_notif->tsf_low,
343 scan_notif->tsf_high, scan_notif->status);
344
345 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
346 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
347 jiffies_to_msecs(jiffies - priv->scan_start));
348
349 /*
350 * When aborting, we run the scan completed background work inline
351 * and the background work must then do nothing. The SCAN_COMPLETE
352 * bit helps implement that logic and thus needs to be set before
353 * queueing the work. Also, since the scan abort waits for SCAN_HW
354 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
355 * to avoid a race there.
356 */
357 set_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
358 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
359 queue_work(priv->shrd->workqueue, &priv->scan_completed);
360
361 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
362 iwl_advanced_bt_coexist(priv) &&
363 priv->bt_status != scan_notif->bt_status) {
364 if (scan_notif->bt_status) {
365 /* BT on */
366 if (!priv->bt_ch_announce)
367 priv->bt_traffic_load =
368 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
369 /*
370 * otherwise, no traffic load information provided
371 * no changes made
372 */
373 } else {
374 /* BT off */
375 priv->bt_traffic_load =
376 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
377 }
378 priv->bt_status = scan_notif->bt_status;
379 queue_work(priv->shrd->workqueue,
380 &priv->bt_traffic_change_work);
381 }
382 return 0;
383 }
384
385 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
386 {
387 /* scan handlers */
388 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
389 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
390 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
391 iwl_rx_scan_results_notif;
392 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
393 iwl_rx_scan_complete_notif;
394 }
395
396 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
397 enum ieee80211_band band, u8 n_probes)
398 {
399 if (band == IEEE80211_BAND_5GHZ)
400 return IWL_ACTIVE_DWELL_TIME_52 +
401 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
402 else
403 return IWL_ACTIVE_DWELL_TIME_24 +
404 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
405 }
406
407 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
408 {
409 struct iwl_rxon_context *ctx;
410
411 /*
412 * If we're associated, we clamp the dwell time 98%
413 * of the smallest beacon interval (minus 2 * channel
414 * tune time)
415 */
416 for_each_context(priv, ctx) {
417 u16 value;
418
419 if (!iwl_is_associated_ctx(ctx))
420 continue;
421 value = ctx->beacon_int;
422 if (!value)
423 value = IWL_PASSIVE_DWELL_BASE;
424 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
425 dwell_time = min(value, dwell_time);
426 }
427
428 return dwell_time;
429 }
430
431 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
432 enum ieee80211_band band)
433 {
434 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
435 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
436 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
437
438 return iwl_limit_dwell(priv, passive);
439 }
440
441 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
442 struct ieee80211_vif *vif,
443 enum ieee80211_band band,
444 struct iwl_scan_channel *scan_ch)
445 {
446 const struct ieee80211_supported_band *sband;
447 u16 passive_dwell = 0;
448 u16 active_dwell = 0;
449 int added = 0;
450 u16 channel = 0;
451
452 sband = iwl_get_hw_mode(priv, band);
453 if (!sband) {
454 IWL_ERR(priv, "invalid band\n");
455 return added;
456 }
457
458 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
459 passive_dwell = iwl_get_passive_dwell_time(priv, band);
460
461 if (passive_dwell <= active_dwell)
462 passive_dwell = active_dwell + 1;
463
464 channel = iwl_get_single_channel_number(priv, band);
465 if (channel) {
466 scan_ch->channel = cpu_to_le16(channel);
467 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
468 scan_ch->active_dwell = cpu_to_le16(active_dwell);
469 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
470 /* Set txpower levels to defaults */
471 scan_ch->dsp_atten = 110;
472 if (band == IEEE80211_BAND_5GHZ)
473 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
474 else
475 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
476 added++;
477 } else
478 IWL_ERR(priv, "no valid channel found\n");
479 return added;
480 }
481
482 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
483 struct ieee80211_vif *vif,
484 enum ieee80211_band band,
485 u8 is_active, u8 n_probes,
486 struct iwl_scan_channel *scan_ch)
487 {
488 struct ieee80211_channel *chan;
489 const struct ieee80211_supported_band *sband;
490 const struct iwl_channel_info *ch_info;
491 u16 passive_dwell = 0;
492 u16 active_dwell = 0;
493 int added, i;
494 u16 channel;
495
496 sband = iwl_get_hw_mode(priv, band);
497 if (!sband)
498 return 0;
499
500 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
501 passive_dwell = iwl_get_passive_dwell_time(priv, band);
502
503 if (passive_dwell <= active_dwell)
504 passive_dwell = active_dwell + 1;
505
506 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
507 chan = priv->scan_request->channels[i];
508
509 if (chan->band != band)
510 continue;
511
512 channel = chan->hw_value;
513 scan_ch->channel = cpu_to_le16(channel);
514
515 ch_info = iwl_get_channel_info(priv, band, channel);
516 if (!is_channel_valid(ch_info)) {
517 IWL_DEBUG_SCAN(priv,
518 "Channel %d is INVALID for this band.\n",
519 channel);
520 continue;
521 }
522
523 if (!is_active || is_channel_passive(ch_info) ||
524 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
525 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
526 else
527 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
528
529 if (n_probes)
530 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
531
532 scan_ch->active_dwell = cpu_to_le16(active_dwell);
533 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
534
535 /* Set txpower levels to defaults */
536 scan_ch->dsp_atten = 110;
537
538 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
539 * power level:
540 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
541 */
542 if (band == IEEE80211_BAND_5GHZ)
543 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
544 else
545 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
546
547 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
548 channel, le32_to_cpu(scan_ch->type),
549 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
550 "ACTIVE" : "PASSIVE",
551 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
552 active_dwell : passive_dwell);
553
554 scan_ch++;
555 added++;
556 }
557
558 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
559 return added;
560 }
561
562 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
563 {
564 struct iwl_host_cmd cmd = {
565 .id = REPLY_SCAN_CMD,
566 .len = { sizeof(struct iwl_scan_cmd), },
567 .flags = CMD_SYNC,
568 };
569 struct iwl_scan_cmd *scan;
570 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
571 u32 rate_flags = 0;
572 u16 cmd_len;
573 u16 rx_chain = 0;
574 enum ieee80211_band band;
575 u8 n_probes = 0;
576 u8 rx_ant = hw_params(priv).valid_rx_ant;
577 u8 rate;
578 bool is_active = false;
579 int chan_mod;
580 u8 active_chains;
581 u8 scan_tx_antennas = hw_params(priv).valid_tx_ant;
582 int ret;
583
584 lockdep_assert_held(&priv->shrd->mutex);
585
586 if (vif)
587 ctx = iwl_rxon_ctx_from_vif(vif);
588
589 if (!priv->scan_cmd) {
590 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
591 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
592 if (!priv->scan_cmd) {
593 IWL_DEBUG_SCAN(priv,
594 "fail to allocate memory for scan\n");
595 return -ENOMEM;
596 }
597 }
598 scan = priv->scan_cmd;
599 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
600
601 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
602 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
603
604 if (priv->scan_type != IWL_SCAN_ROC &&
605 iwl_is_any_associated(priv)) {
606 u16 interval = 0;
607 u32 extra;
608 u32 suspend_time = 100;
609 u32 scan_suspend_time = 100;
610
611 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
612 switch (priv->scan_type) {
613 case IWL_SCAN_ROC:
614 WARN_ON(1);
615 break;
616 case IWL_SCAN_RADIO_RESET:
617 interval = 0;
618 break;
619 case IWL_SCAN_NORMAL:
620 interval = vif->bss_conf.beacon_int;
621 break;
622 }
623
624 scan->suspend_time = 0;
625 scan->max_out_time = cpu_to_le32(200 * 1024);
626 if (!interval)
627 interval = suspend_time;
628
629 extra = (suspend_time / interval) << 22;
630 scan_suspend_time = (extra |
631 ((suspend_time % interval) * 1024));
632 scan->suspend_time = cpu_to_le32(scan_suspend_time);
633 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
634 scan_suspend_time, interval);
635 } else if (priv->scan_type == IWL_SCAN_ROC) {
636 scan->suspend_time = 0;
637 scan->max_out_time = 0;
638 scan->quiet_time = 0;
639 scan->quiet_plcp_th = 0;
640 }
641
642 switch (priv->scan_type) {
643 case IWL_SCAN_RADIO_RESET:
644 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
645 break;
646 case IWL_SCAN_NORMAL:
647 if (priv->scan_request->n_ssids) {
648 int i, p = 0;
649 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
650 for (i = 0; i < priv->scan_request->n_ssids; i++) {
651 /* always does wildcard anyway */
652 if (!priv->scan_request->ssids[i].ssid_len)
653 continue;
654 scan->direct_scan[p].id = WLAN_EID_SSID;
655 scan->direct_scan[p].len =
656 priv->scan_request->ssids[i].ssid_len;
657 memcpy(scan->direct_scan[p].ssid,
658 priv->scan_request->ssids[i].ssid,
659 priv->scan_request->ssids[i].ssid_len);
660 n_probes++;
661 p++;
662 }
663 is_active = true;
664 } else
665 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
666 break;
667 case IWL_SCAN_ROC:
668 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
669 break;
670 }
671
672 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
673 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
674 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
675
676 switch (priv->scan_band) {
677 case IEEE80211_BAND_2GHZ:
678 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
679 chan_mod = le32_to_cpu(
680 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
681 RXON_FLG_CHANNEL_MODE_MSK)
682 >> RXON_FLG_CHANNEL_MODE_POS;
683 if (chan_mod == CHANNEL_MODE_PURE_40) {
684 rate = IWL_RATE_6M_PLCP;
685 } else {
686 rate = IWL_RATE_1M_PLCP;
687 rate_flags = RATE_MCS_CCK_MSK;
688 }
689 /*
690 * Internal scans are passive, so we can indiscriminately set
691 * the BT ignore flag on 2.4 GHz since it applies to TX only.
692 */
693 if (priv->cfg->bt_params &&
694 priv->cfg->bt_params->advanced_bt_coexist)
695 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
696 break;
697 case IEEE80211_BAND_5GHZ:
698 rate = IWL_RATE_6M_PLCP;
699 break;
700 default:
701 IWL_WARN(priv, "Invalid scan band\n");
702 return -EIO;
703 }
704
705 /*
706 * If active scanning is requested but a certain channel is
707 * marked passive, we can do active scanning if we detect
708 * transmissions.
709 *
710 * There is an issue with some firmware versions that triggers
711 * a sysassert on a "good CRC threshold" of zero (== disabled),
712 * on a radar channel even though this means that we should NOT
713 * send probes.
714 *
715 * The "good CRC threshold" is the number of frames that we
716 * need to receive during our dwell time on a channel before
717 * sending out probes -- setting this to a huge value will
718 * mean we never reach it, but at the same time work around
719 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
720 * here instead of IWL_GOOD_CRC_TH_DISABLED.
721 *
722 * This was fixed in later versions along with some other
723 * scan changes, and the threshold behaves as a flag in those
724 * versions.
725 */
726 if (priv->new_scan_threshold_behaviour)
727 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
728 IWL_GOOD_CRC_TH_DISABLED;
729 else
730 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
731 IWL_GOOD_CRC_TH_NEVER;
732
733 band = priv->scan_band;
734
735 if (priv->cfg->scan_rx_antennas[band])
736 rx_ant = priv->cfg->scan_rx_antennas[band];
737
738 if (band == IEEE80211_BAND_2GHZ &&
739 priv->cfg->bt_params &&
740 priv->cfg->bt_params->advanced_bt_coexist) {
741 /* transmit 2.4 GHz probes only on first antenna */
742 scan_tx_antennas = first_antenna(scan_tx_antennas);
743 }
744
745 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
746 priv->scan_tx_ant[band],
747 scan_tx_antennas);
748 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
749 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
750
751 /* In power save mode use one chain, otherwise use all chains */
752 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
753 /* rx_ant has been set to all valid chains previously */
754 active_chains = rx_ant &
755 ((u8)(priv->chain_noise_data.active_chains));
756 if (!active_chains)
757 active_chains = rx_ant;
758
759 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
760 priv->chain_noise_data.active_chains);
761
762 rx_ant = first_antenna(active_chains);
763 }
764 if (priv->cfg->bt_params &&
765 priv->cfg->bt_params->advanced_bt_coexist &&
766 priv->bt_full_concurrent) {
767 /* operated as 1x1 in full concurrency mode */
768 rx_ant = first_antenna(rx_ant);
769 }
770
771 /* MIMO is not used here, but value is required */
772 rx_chain |=
773 hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
774 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
775 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
776 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
777 scan->rx_chain = cpu_to_le16(rx_chain);
778 switch (priv->scan_type) {
779 case IWL_SCAN_NORMAL:
780 cmd_len = iwl_fill_probe_req(priv,
781 (struct ieee80211_mgmt *)scan->data,
782 vif->addr,
783 priv->scan_request->ie,
784 priv->scan_request->ie_len,
785 IWL_MAX_SCAN_SIZE - sizeof(*scan));
786 break;
787 case IWL_SCAN_RADIO_RESET:
788 case IWL_SCAN_ROC:
789 /* use bcast addr, will not be transmitted but must be valid */
790 cmd_len = iwl_fill_probe_req(priv,
791 (struct ieee80211_mgmt *)scan->data,
792 iwl_bcast_addr, NULL, 0,
793 IWL_MAX_SCAN_SIZE - sizeof(*scan));
794 break;
795 default:
796 BUG();
797 }
798 scan->tx_cmd.len = cpu_to_le16(cmd_len);
799
800 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
801 RXON_FILTER_BCON_AWARE_MSK);
802
803 switch (priv->scan_type) {
804 case IWL_SCAN_RADIO_RESET:
805 scan->channel_count =
806 iwl_get_single_channel_for_scan(priv, vif, band,
807 (void *)&scan->data[cmd_len]);
808 break;
809 case IWL_SCAN_NORMAL:
810 scan->channel_count =
811 iwl_get_channels_for_scan(priv, vif, band,
812 is_active, n_probes,
813 (void *)&scan->data[cmd_len]);
814 break;
815 case IWL_SCAN_ROC: {
816 struct iwl_scan_channel *scan_ch;
817 int n_chan, i;
818 u16 dwell;
819
820 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
821 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
822
823 scan->channel_count = n_chan;
824
825 scan_ch = (void *)&scan->data[cmd_len];
826
827 for (i = 0; i < n_chan; i++) {
828 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
829 scan_ch->channel =
830 cpu_to_le16(priv->hw_roc_channel->hw_value);
831
832 if (i == n_chan - 1)
833 dwell = priv->hw_roc_duration - i * dwell;
834
835 scan_ch->active_dwell =
836 scan_ch->passive_dwell = cpu_to_le16(dwell);
837
838 /* Set txpower levels to defaults */
839 scan_ch->dsp_atten = 110;
840
841 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
842 * power level:
843 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
844 */
845 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
846 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
847 else
848 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
849
850 scan_ch++;
851 }
852 }
853
854 break;
855 }
856
857 if (scan->channel_count == 0) {
858 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
859 return -EIO;
860 }
861
862 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
863 scan->channel_count * sizeof(struct iwl_scan_channel);
864 cmd.data[0] = scan;
865 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
866 scan->len = cpu_to_le16(cmd.len[0]);
867
868 /* set scan bit here for PAN params */
869 set_bit(STATUS_SCAN_HW, &priv->shrd->status);
870
871 ret = iwlagn_set_pan_params(priv);
872 if (ret)
873 return ret;
874
875 ret = iwl_trans_send_cmd(trans(priv), &cmd);
876 if (ret) {
877 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
878 iwlagn_set_pan_params(priv);
879 }
880
881 return ret;
882 }
883
884 void iwl_init_scan_params(struct iwl_priv *priv)
885 {
886 u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1;
887 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
888 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
889 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
890 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
891 }
892
893 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
894 struct ieee80211_vif *vif,
895 enum iwl_scan_type scan_type,
896 enum ieee80211_band band)
897 {
898 int ret;
899
900 lockdep_assert_held(&priv->shrd->mutex);
901
902 cancel_delayed_work(&priv->scan_check);
903
904 if (!iwl_is_ready_rf(priv->shrd)) {
905 IWL_WARN(priv, "Request scan called when driver not ready.\n");
906 return -EIO;
907 }
908
909 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
910 IWL_DEBUG_SCAN(priv,
911 "Multiple concurrent scan requests in parallel.\n");
912 return -EBUSY;
913 }
914
915 if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
916 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
917 return -EBUSY;
918 }
919
920 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
921 scan_type == IWL_SCAN_NORMAL ? "" :
922 scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
923 "internal short ");
924
925 set_bit(STATUS_SCANNING, &priv->shrd->status);
926 priv->scan_type = scan_type;
927 priv->scan_start = jiffies;
928 priv->scan_band = band;
929
930 ret = iwlagn_request_scan(priv, vif);
931 if (ret) {
932 clear_bit(STATUS_SCANNING, &priv->shrd->status);
933 priv->scan_type = IWL_SCAN_NORMAL;
934 return ret;
935 }
936
937 queue_delayed_work(priv->shrd->workqueue, &priv->scan_check,
938 IWL_SCAN_CHECK_WATCHDOG);
939
940 return 0;
941 }
942
943 int iwlagn_mac_hw_scan(struct ieee80211_hw *hw,
944 struct ieee80211_vif *vif,
945 struct cfg80211_scan_request *req)
946 {
947 struct iwl_priv *priv = hw->priv;
948 int ret;
949
950 IWL_DEBUG_MAC80211(priv, "enter\n");
951
952 if (req->n_channels == 0)
953 return -EINVAL;
954
955 mutex_lock(&priv->shrd->mutex);
956
957 /*
958 * If an internal scan is in progress, just set
959 * up the scan_request as per above.
960 */
961 if (priv->scan_type != IWL_SCAN_NORMAL) {
962 IWL_DEBUG_SCAN(priv,
963 "SCAN request during internal scan - defer\n");
964 priv->scan_request = req;
965 priv->scan_vif = vif;
966 ret = 0;
967 } else {
968 priv->scan_request = req;
969 priv->scan_vif = vif;
970 /*
971 * mac80211 will only ask for one band at a time
972 * so using channels[0] here is ok
973 */
974 ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL,
975 req->channels[0]->band);
976 if (ret) {
977 priv->scan_request = NULL;
978 priv->scan_vif = NULL;
979 }
980 }
981
982 IWL_DEBUG_MAC80211(priv, "leave\n");
983
984 mutex_unlock(&priv->shrd->mutex);
985
986 return ret;
987 }
988
989 /*
990 * internal short scan, this function should only been called while associated.
991 * It will reset and tune the radio to prevent possible RF related problem
992 */
993 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
994 {
995 queue_work(priv->shrd->workqueue, &priv->start_internal_scan);
996 }
997
998 static void iwl_bg_start_internal_scan(struct work_struct *work)
999 {
1000 struct iwl_priv *priv =
1001 container_of(work, struct iwl_priv, start_internal_scan);
1002
1003 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
1004
1005 mutex_lock(&priv->shrd->mutex);
1006
1007 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
1008 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
1009 goto unlock;
1010 }
1011
1012 if (test_bit(STATUS_SCANNING, &priv->shrd->status)) {
1013 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
1014 goto unlock;
1015 }
1016
1017 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
1018 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
1019 unlock:
1020 mutex_unlock(&priv->shrd->mutex);
1021 }
1022
1023 static void iwl_bg_scan_check(struct work_struct *data)
1024 {
1025 struct iwl_priv *priv =
1026 container_of(data, struct iwl_priv, scan_check.work);
1027
1028 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1029
1030 /* Since we are here firmware does not finish scan and
1031 * most likely is in bad shape, so we don't bother to
1032 * send abort command, just force scan complete to mac80211 */
1033 mutex_lock(&priv->shrd->mutex);
1034 iwl_force_scan_end(priv);
1035 mutex_unlock(&priv->shrd->mutex);
1036 }
1037
1038 /**
1039 * iwl_fill_probe_req - fill in all required fields and IE for probe request
1040 */
1041
1042 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
1043 const u8 *ta, const u8 *ies, int ie_len, int left)
1044 {
1045 int len = 0;
1046 u8 *pos = NULL;
1047
1048 /* Make sure there is enough space for the probe request,
1049 * two mandatory IEs and the data */
1050 left -= 24;
1051 if (left < 0)
1052 return 0;
1053
1054 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
1055 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
1056 memcpy(frame->sa, ta, ETH_ALEN);
1057 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
1058 frame->seq_ctrl = 0;
1059
1060 len += 24;
1061
1062 /* ...next IE... */
1063 pos = &frame->u.probe_req.variable[0];
1064
1065 /* fill in our indirect SSID IE */
1066 left -= 2;
1067 if (left < 0)
1068 return 0;
1069 *pos++ = WLAN_EID_SSID;
1070 *pos++ = 0;
1071
1072 len += 2;
1073
1074 if (WARN_ON(left < ie_len))
1075 return len;
1076
1077 if (ies && ie_len) {
1078 memcpy(pos, ies, ie_len);
1079 len += ie_len;
1080 }
1081
1082 return (u16)len;
1083 }
1084
1085 static void iwl_bg_abort_scan(struct work_struct *work)
1086 {
1087 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1088
1089 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1090
1091 /* We keep scan_check work queued in case when firmware will not
1092 * report back scan completed notification */
1093 mutex_lock(&priv->shrd->mutex);
1094 iwl_scan_cancel_timeout(priv, 200);
1095 mutex_unlock(&priv->shrd->mutex);
1096 }
1097
1098 static void iwl_bg_scan_completed(struct work_struct *work)
1099 {
1100 struct iwl_priv *priv =
1101 container_of(work, struct iwl_priv, scan_completed);
1102
1103 mutex_lock(&priv->shrd->mutex);
1104 iwl_process_scan_complete(priv);
1105 mutex_unlock(&priv->shrd->mutex);
1106 }
1107
1108 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1109 {
1110 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1111 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1112 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1113 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1114 }
1115
1116 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1117 {
1118 cancel_work_sync(&priv->start_internal_scan);
1119 cancel_work_sync(&priv->abort_scan);
1120 cancel_work_sync(&priv->scan_completed);
1121
1122 if (cancel_delayed_work_sync(&priv->scan_check)) {
1123 mutex_lock(&priv->shrd->mutex);
1124 iwl_force_scan_end(priv);
1125 mutex_unlock(&priv->shrd->mutex);
1126 }
1127 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree