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iwlagn: refactor scan complete
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
blob30100220ce2b896960a5e152829097c66eae9c01
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 void iwl_force_scan_end(struct iwl_priv *priv)
118 {
119 lockdep_assert_held(&priv->shrd->mutex);
120
121 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
122 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
123 return;
124 }
125
126 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
127 clear_bit(STATUS_SCANNING, &priv->shrd->status);
128 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
129 clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
130 iwl_complete_scan(priv, true);
131 }
132
133 static void iwl_do_scan_abort(struct iwl_priv *priv)
134 {
135 int ret;
136
137 lockdep_assert_held(&priv->shrd->mutex);
138
139 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
140 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
141 return;
142 }
143
144 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
145 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
146 return;
147 }
148
149 ret = iwl_send_scan_abort(priv);
150 if (ret) {
151 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
152 iwl_force_scan_end(priv);
153 } else
154 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
155 }
156
157 /**
158 * iwl_scan_cancel - Cancel any currently executing HW scan
159 */
160 int iwl_scan_cancel(struct iwl_priv *priv)
161 {
162 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
163 queue_work(priv->shrd->workqueue, &priv->abort_scan);
164 return 0;
165 }
166
167 /**
168 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
169 * @ms: amount of time to wait (in milliseconds) for scan to abort
170 *
171 */
172 void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
173 {
174 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
175
176 lockdep_assert_held(&priv->shrd->mutex);
177
178 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
179
180 iwl_do_scan_abort(priv);
181
182 while (time_before_eq(jiffies, timeout)) {
183 if (!test_bit(STATUS_SCAN_HW, &priv->shrd->status))
184 break;
185 msleep(20);
186 }
187 }
188
189 /* Service response to REPLY_SCAN_CMD (0x80) */
190 static int iwl_rx_reply_scan(struct iwl_priv *priv,
191 struct iwl_rx_mem_buffer *rxb,
192 struct iwl_device_cmd *cmd)
193 {
194 #ifdef CONFIG_IWLWIFI_DEBUG
195 struct iwl_rx_packet *pkt = rxb_addr(rxb);
196 struct iwl_scanreq_notification *notif =
197 (struct iwl_scanreq_notification *)pkt->u.raw;
198
199 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
200 #endif
201 return 0;
202 }
203
204 /* Service SCAN_START_NOTIFICATION (0x82) */
205 static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
206 struct iwl_rx_mem_buffer *rxb,
207 struct iwl_device_cmd *cmd)
208 {
209 struct iwl_rx_packet *pkt = rxb_addr(rxb);
210 struct iwl_scanstart_notification *notif =
211 (struct iwl_scanstart_notification *)pkt->u.raw;
212 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
213 IWL_DEBUG_SCAN(priv, "Scan start: "
214 "%d [802.11%s] "
215 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
216 notif->channel,
217 notif->band ? "bg" : "a",
218 le32_to_cpu(notif->tsf_high),
219 le32_to_cpu(notif->tsf_low),
220 notif->status, notif->beacon_timer);
221
222 if (priv->scan_type == IWL_SCAN_ROC &&
223 !priv->hw_roc_start_notified) {
224 ieee80211_ready_on_channel(priv->hw);
225 priv->hw_roc_start_notified = true;
226 }
227
228 return 0;
229 }
230
231 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
232 static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
233 struct iwl_rx_mem_buffer *rxb,
234 struct iwl_device_cmd *cmd)
235 {
236 #ifdef CONFIG_IWLWIFI_DEBUG
237 struct iwl_rx_packet *pkt = rxb_addr(rxb);
238 struct iwl_scanresults_notification *notif =
239 (struct iwl_scanresults_notification *)pkt->u.raw;
240
241 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
242 "%d [802.11%s] "
243 "probe status: %u:%u "
244 "(TSF: 0x%08X:%08X) - %d "
245 "elapsed=%lu usec\n",
246 notif->channel,
247 notif->band ? "bg" : "a",
248 notif->probe_status, notif->num_probe_not_sent,
249 le32_to_cpu(notif->tsf_high),
250 le32_to_cpu(notif->tsf_low),
251 le32_to_cpu(notif->statistics[0]),
252 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
253 #endif
254 return 0;
255 }
256
257 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
258 static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
259 struct iwl_rx_mem_buffer *rxb,
260 struct iwl_device_cmd *cmd)
261 {
262 struct iwl_rx_packet *pkt = rxb_addr(rxb);
263 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
264
265 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
266 scan_notif->scanned_channels,
267 scan_notif->tsf_low,
268 scan_notif->tsf_high, scan_notif->status);
269
270 /* The HW is no longer scanning */
271 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
272
273 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
274 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
275 jiffies_to_msecs(jiffies - priv->scan_start));
276
277 queue_work(priv->shrd->workqueue, &priv->scan_completed);
278
279 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
280 iwl_advanced_bt_coexist(priv) &&
281 priv->bt_status != scan_notif->bt_status) {
282 if (scan_notif->bt_status) {
283 /* BT on */
284 if (!priv->bt_ch_announce)
285 priv->bt_traffic_load =
286 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
287 /*
288 * otherwise, no traffic load information provided
289 * no changes made
290 */
291 } else {
292 /* BT off */
293 priv->bt_traffic_load =
294 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
295 }
296 priv->bt_status = scan_notif->bt_status;
297 queue_work(priv->shrd->workqueue,
298 &priv->bt_traffic_change_work);
299 }
300 return 0;
301 }
302
303 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
304 {
305 /* scan handlers */
306 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
307 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
308 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
309 iwl_rx_scan_results_notif;
310 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
311 iwl_rx_scan_complete_notif;
312 }
313
314 static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
315 enum ieee80211_band band, u8 n_probes)
316 {
317 if (band == IEEE80211_BAND_5GHZ)
318 return IWL_ACTIVE_DWELL_TIME_52 +
319 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
320 else
321 return IWL_ACTIVE_DWELL_TIME_24 +
322 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
323 }
324
325 static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
326 {
327 struct iwl_rxon_context *ctx;
328
329 /*
330 * If we're associated, we clamp the dwell time 98%
331 * of the smallest beacon interval (minus 2 * channel
332 * tune time)
333 */
334 for_each_context(priv, ctx) {
335 u16 value;
336
337 if (!iwl_is_associated_ctx(ctx))
338 continue;
339 value = ctx->beacon_int;
340 if (!value)
341 value = IWL_PASSIVE_DWELL_BASE;
342 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
343 dwell_time = min(value, dwell_time);
344 }
345
346 return dwell_time;
347 }
348
349 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
350 enum ieee80211_band band)
351 {
352 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
353 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
354 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
355
356 return iwl_limit_dwell(priv, passive);
357 }
358
359 static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
360 struct ieee80211_vif *vif,
361 enum ieee80211_band band,
362 struct iwl_scan_channel *scan_ch)
363 {
364 const struct ieee80211_supported_band *sband;
365 u16 passive_dwell = 0;
366 u16 active_dwell = 0;
367 int added = 0;
368 u16 channel = 0;
369
370 sband = iwl_get_hw_mode(priv, band);
371 if (!sband) {
372 IWL_ERR(priv, "invalid band\n");
373 return added;
374 }
375
376 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
377 passive_dwell = iwl_get_passive_dwell_time(priv, band);
378
379 if (passive_dwell <= active_dwell)
380 passive_dwell = active_dwell + 1;
381
382 channel = iwl_get_single_channel_number(priv, band);
383 if (channel) {
384 scan_ch->channel = cpu_to_le16(channel);
385 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
386 scan_ch->active_dwell = cpu_to_le16(active_dwell);
387 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
388 /* Set txpower levels to defaults */
389 scan_ch->dsp_atten = 110;
390 if (band == IEEE80211_BAND_5GHZ)
391 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
392 else
393 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
394 added++;
395 } else
396 IWL_ERR(priv, "no valid channel found\n");
397 return added;
398 }
399
400 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
401 struct ieee80211_vif *vif,
402 enum ieee80211_band band,
403 u8 is_active, u8 n_probes,
404 struct iwl_scan_channel *scan_ch)
405 {
406 struct ieee80211_channel *chan;
407 const struct ieee80211_supported_band *sband;
408 const struct iwl_channel_info *ch_info;
409 u16 passive_dwell = 0;
410 u16 active_dwell = 0;
411 int added, i;
412 u16 channel;
413
414 sband = iwl_get_hw_mode(priv, band);
415 if (!sband)
416 return 0;
417
418 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
419 passive_dwell = iwl_get_passive_dwell_time(priv, band);
420
421 if (passive_dwell <= active_dwell)
422 passive_dwell = active_dwell + 1;
423
424 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
425 chan = priv->scan_request->channels[i];
426
427 if (chan->band != band)
428 continue;
429
430 channel = chan->hw_value;
431 scan_ch->channel = cpu_to_le16(channel);
432
433 ch_info = iwl_get_channel_info(priv, band, channel);
434 if (!is_channel_valid(ch_info)) {
435 IWL_DEBUG_SCAN(priv,
436 "Channel %d is INVALID for this band.\n",
437 channel);
438 continue;
439 }
440
441 if (!is_active || is_channel_passive(ch_info) ||
442 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
443 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
444 else
445 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
446
447 if (n_probes)
448 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
449
450 scan_ch->active_dwell = cpu_to_le16(active_dwell);
451 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
452
453 /* Set txpower levels to defaults */
454 scan_ch->dsp_atten = 110;
455
456 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
457 * power level:
458 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
459 */
460 if (band == IEEE80211_BAND_5GHZ)
461 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
462 else
463 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
464
465 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
466 channel, le32_to_cpu(scan_ch->type),
467 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
468 "ACTIVE" : "PASSIVE",
469 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
470 active_dwell : passive_dwell);
471
472 scan_ch++;
473 added++;
474 }
475
476 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
477 return added;
478 }
479
480 static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
481 {
482 struct iwl_host_cmd cmd = {
483 .id = REPLY_SCAN_CMD,
484 .len = { sizeof(struct iwl_scan_cmd), },
485 .flags = CMD_SYNC,
486 };
487 struct iwl_scan_cmd *scan;
488 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
489 u32 rate_flags = 0;
490 u16 cmd_len;
491 u16 rx_chain = 0;
492 enum ieee80211_band band;
493 u8 n_probes = 0;
494 u8 rx_ant = hw_params(priv).valid_rx_ant;
495 u8 rate;
496 bool is_active = false;
497 int chan_mod;
498 u8 active_chains;
499 u8 scan_tx_antennas = hw_params(priv).valid_tx_ant;
500 int ret;
501
502 lockdep_assert_held(&priv->shrd->mutex);
503
504 if (vif)
505 ctx = iwl_rxon_ctx_from_vif(vif);
506
507 if (!priv->scan_cmd) {
508 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
509 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
510 if (!priv->scan_cmd) {
511 IWL_DEBUG_SCAN(priv,
512 "fail to allocate memory for scan\n");
513 return -ENOMEM;
514 }
515 }
516 scan = priv->scan_cmd;
517 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
518
519 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
520 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
521
522 if (priv->scan_type != IWL_SCAN_ROC &&
523 iwl_is_any_associated(priv)) {
524 u16 interval = 0;
525 u32 extra;
526 u32 suspend_time = 100;
527 u32 scan_suspend_time = 100;
528
529 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
530 switch (priv->scan_type) {
531 case IWL_SCAN_ROC:
532 WARN_ON(1);
533 break;
534 case IWL_SCAN_RADIO_RESET:
535 interval = 0;
536 break;
537 case IWL_SCAN_NORMAL:
538 interval = vif->bss_conf.beacon_int;
539 break;
540 }
541
542 scan->suspend_time = 0;
543 scan->max_out_time = cpu_to_le32(200 * 1024);
544 if (!interval)
545 interval = suspend_time;
546
547 extra = (suspend_time / interval) << 22;
548 scan_suspend_time = (extra |
549 ((suspend_time % interval) * 1024));
550 scan->suspend_time = cpu_to_le32(scan_suspend_time);
551 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
552 scan_suspend_time, interval);
553 } else if (priv->scan_type == IWL_SCAN_ROC) {
554 scan->suspend_time = 0;
555 scan->max_out_time = 0;
556 scan->quiet_time = 0;
557 scan->quiet_plcp_th = 0;
558 }
559
560 switch (priv->scan_type) {
561 case IWL_SCAN_RADIO_RESET:
562 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
563 break;
564 case IWL_SCAN_NORMAL:
565 if (priv->scan_request->n_ssids) {
566 int i, p = 0;
567 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
568 for (i = 0; i < priv->scan_request->n_ssids; i++) {
569 /* always does wildcard anyway */
570 if (!priv->scan_request->ssids[i].ssid_len)
571 continue;
572 scan->direct_scan[p].id = WLAN_EID_SSID;
573 scan->direct_scan[p].len =
574 priv->scan_request->ssids[i].ssid_len;
575 memcpy(scan->direct_scan[p].ssid,
576 priv->scan_request->ssids[i].ssid,
577 priv->scan_request->ssids[i].ssid_len);
578 n_probes++;
579 p++;
580 }
581 is_active = true;
582 } else
583 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
584 break;
585 case IWL_SCAN_ROC:
586 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
587 break;
588 }
589
590 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
591 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
592 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
593
594 switch (priv->scan_band) {
595 case IEEE80211_BAND_2GHZ:
596 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
597 chan_mod = le32_to_cpu(
598 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
599 RXON_FLG_CHANNEL_MODE_MSK)
600 >> RXON_FLG_CHANNEL_MODE_POS;
601 if (chan_mod == CHANNEL_MODE_PURE_40) {
602 rate = IWL_RATE_6M_PLCP;
603 } else {
604 rate = IWL_RATE_1M_PLCP;
605 rate_flags = RATE_MCS_CCK_MSK;
606 }
607 /*
608 * Internal scans are passive, so we can indiscriminately set
609 * the BT ignore flag on 2.4 GHz since it applies to TX only.
610 */
611 if (priv->cfg->bt_params &&
612 priv->cfg->bt_params->advanced_bt_coexist)
613 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
614 break;
615 case IEEE80211_BAND_5GHZ:
616 rate = IWL_RATE_6M_PLCP;
617 break;
618 default:
619 IWL_WARN(priv, "Invalid scan band\n");
620 return -EIO;
621 }
622
623 /*
624 * If active scanning is requested but a certain channel is
625 * marked passive, we can do active scanning if we detect
626 * transmissions.
627 *
628 * There is an issue with some firmware versions that triggers
629 * a sysassert on a "good CRC threshold" of zero (== disabled),
630 * on a radar channel even though this means that we should NOT
631 * send probes.
632 *
633 * The "good CRC threshold" is the number of frames that we
634 * need to receive during our dwell time on a channel before
635 * sending out probes -- setting this to a huge value will
636 * mean we never reach it, but at the same time work around
637 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
638 * here instead of IWL_GOOD_CRC_TH_DISABLED.
639 *
640 * This was fixed in later versions along with some other
641 * scan changes, and the threshold behaves as a flag in those
642 * versions.
643 */
644 if (priv->new_scan_threshold_behaviour)
645 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
646 IWL_GOOD_CRC_TH_DISABLED;
647 else
648 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
649 IWL_GOOD_CRC_TH_NEVER;
650
651 band = priv->scan_band;
652
653 if (priv->cfg->scan_rx_antennas[band])
654 rx_ant = priv->cfg->scan_rx_antennas[band];
655
656 if (band == IEEE80211_BAND_2GHZ &&
657 priv->cfg->bt_params &&
658 priv->cfg->bt_params->advanced_bt_coexist) {
659 /* transmit 2.4 GHz probes only on first antenna */
660 scan_tx_antennas = first_antenna(scan_tx_antennas);
661 }
662
663 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
664 priv->scan_tx_ant[band],
665 scan_tx_antennas);
666 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
667 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
668
669 /* In power save mode use one chain, otherwise use all chains */
670 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
671 /* rx_ant has been set to all valid chains previously */
672 active_chains = rx_ant &
673 ((u8)(priv->chain_noise_data.active_chains));
674 if (!active_chains)
675 active_chains = rx_ant;
676
677 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
678 priv->chain_noise_data.active_chains);
679
680 rx_ant = first_antenna(active_chains);
681 }
682 if (priv->cfg->bt_params &&
683 priv->cfg->bt_params->advanced_bt_coexist &&
684 priv->bt_full_concurrent) {
685 /* operated as 1x1 in full concurrency mode */
686 rx_ant = first_antenna(rx_ant);
687 }
688
689 /* MIMO is not used here, but value is required */
690 rx_chain |=
691 hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
692 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
693 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
694 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
695 scan->rx_chain = cpu_to_le16(rx_chain);
696 switch (priv->scan_type) {
697 case IWL_SCAN_NORMAL:
698 cmd_len = iwl_fill_probe_req(priv,
699 (struct ieee80211_mgmt *)scan->data,
700 vif->addr,
701 priv->scan_request->ie,
702 priv->scan_request->ie_len,
703 IWL_MAX_SCAN_SIZE - sizeof(*scan));
704 break;
705 case IWL_SCAN_RADIO_RESET:
706 case IWL_SCAN_ROC:
707 /* use bcast addr, will not be transmitted but must be valid */
708 cmd_len = iwl_fill_probe_req(priv,
709 (struct ieee80211_mgmt *)scan->data,
710 iwl_bcast_addr, NULL, 0,
711 IWL_MAX_SCAN_SIZE - sizeof(*scan));
712 break;
713 default:
714 BUG();
715 }
716 scan->tx_cmd.len = cpu_to_le16(cmd_len);
717
718 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
719 RXON_FILTER_BCON_AWARE_MSK);
720
721 switch (priv->scan_type) {
722 case IWL_SCAN_RADIO_RESET:
723 scan->channel_count =
724 iwl_get_single_channel_for_scan(priv, vif, band,
725 (void *)&scan->data[cmd_len]);
726 break;
727 case IWL_SCAN_NORMAL:
728 scan->channel_count =
729 iwl_get_channels_for_scan(priv, vif, band,
730 is_active, n_probes,
731 (void *)&scan->data[cmd_len]);
732 break;
733 case IWL_SCAN_ROC: {
734 struct iwl_scan_channel *scan_ch;
735 int n_chan, i;
736 u16 dwell;
737
738 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
739 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
740
741 scan->channel_count = n_chan;
742
743 scan_ch = (void *)&scan->data[cmd_len];
744
745 for (i = 0; i < n_chan; i++) {
746 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
747 scan_ch->channel =
748 cpu_to_le16(priv->hw_roc_channel->hw_value);
749
750 if (i == n_chan - 1)
751 dwell = priv->hw_roc_duration - i * dwell;
752
753 scan_ch->active_dwell =
754 scan_ch->passive_dwell = cpu_to_le16(dwell);
755
756 /* Set txpower levels to defaults */
757 scan_ch->dsp_atten = 110;
758
759 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
760 * power level:
761 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
762 */
763 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
764 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
765 else
766 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
767
768 scan_ch++;
769 }
770 }
771
772 break;
773 }
774
775 if (scan->channel_count == 0) {
776 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
777 return -EIO;
778 }
779
780 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
781 scan->channel_count * sizeof(struct iwl_scan_channel);
782 cmd.data[0] = scan;
783 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
784 scan->len = cpu_to_le16(cmd.len[0]);
785
786 /* set scan bit here for PAN params */
787 set_bit(STATUS_SCAN_HW, &priv->shrd->status);
788
789 ret = iwlagn_set_pan_params(priv);
790 if (ret)
791 return ret;
792
793 ret = iwl_trans_send_cmd(trans(priv), &cmd);
794 if (ret) {
795 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
796 iwlagn_set_pan_params(priv);
797 }
798
799 return ret;
800 }
801
802 void iwl_init_scan_params(struct iwl_priv *priv)
803 {
804 u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1;
805 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
806 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
807 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
808 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
809 }
810
811 int __must_check iwl_scan_initiate(struct iwl_priv *priv,
812 struct ieee80211_vif *vif,
813 enum iwl_scan_type scan_type,
814 enum ieee80211_band band)
815 {
816 int ret;
817
818 lockdep_assert_held(&priv->shrd->mutex);
819
820 cancel_delayed_work(&priv->scan_check);
821
822 if (!iwl_is_ready_rf(priv->shrd)) {
823 IWL_WARN(priv, "Request scan called when driver not ready.\n");
824 return -EIO;
825 }
826
827 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
828 IWL_DEBUG_SCAN(priv,
829 "Multiple concurrent scan requests in parallel.\n");
830 return -EBUSY;
831 }
832
833 if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
834 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
835 return -EBUSY;
836 }
837
838 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
839 scan_type == IWL_SCAN_NORMAL ? "" :
840 scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
841 "internal short ");
842
843 set_bit(STATUS_SCANNING, &priv->shrd->status);
844 priv->scan_type = scan_type;
845 priv->scan_start = jiffies;
846 priv->scan_band = band;
847
848 ret = iwlagn_request_scan(priv, vif);
849 if (ret) {
850 clear_bit(STATUS_SCANNING, &priv->shrd->status);
851 priv->scan_type = IWL_SCAN_NORMAL;
852 return ret;
853 }
854
855 queue_delayed_work(priv->shrd->workqueue, &priv->scan_check,
856 IWL_SCAN_CHECK_WATCHDOG);
857
858 return 0;
859 }
860
861 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
862 struct ieee80211_vif *vif,
863 struct cfg80211_scan_request *req)
864 {
865 struct iwl_priv *priv = hw->priv;
866 int ret;
867
868 IWL_DEBUG_MAC80211(priv, "enter\n");
869
870 if (req->n_channels == 0)
871 return -EINVAL;
872
873 mutex_lock(&priv->shrd->mutex);
874
875 /*
876 * If an internal scan is in progress, just set
877 * up the scan_request as per above.
878 */
879 if (priv->scan_type != IWL_SCAN_NORMAL) {
880 IWL_DEBUG_SCAN(priv,
881 "SCAN request during internal scan - defer\n");
882 priv->scan_request = req;
883 priv->scan_vif = vif;
884 ret = 0;
885 } else {
886 priv->scan_request = req;
887 priv->scan_vif = vif;
888 /*
889 * mac80211 will only ask for one band at a time
890 * so using channels[0] here is ok
891 */
892 ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL,
893 req->channels[0]->band);
894 if (ret) {
895 priv->scan_request = NULL;
896 priv->scan_vif = NULL;
897 }
898 }
899
900 IWL_DEBUG_MAC80211(priv, "leave\n");
901
902 mutex_unlock(&priv->shrd->mutex);
903
904 return ret;
905 }
906
907 /*
908 * internal short scan, this function should only been called while associated.
909 * It will reset and tune the radio to prevent possible RF related problem
910 */
911 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
912 {
913 queue_work(priv->shrd->workqueue, &priv->start_internal_scan);
914 }
915
916 static void iwl_bg_start_internal_scan(struct work_struct *work)
917 {
918 struct iwl_priv *priv =
919 container_of(work, struct iwl_priv, start_internal_scan);
920
921 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
922
923 mutex_lock(&priv->shrd->mutex);
924
925 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
926 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
927 goto unlock;
928 }
929
930 if (test_bit(STATUS_SCANNING, &priv->shrd->status)) {
931 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
932 goto unlock;
933 }
934
935 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
936 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
937 unlock:
938 mutex_unlock(&priv->shrd->mutex);
939 }
940
941 static void iwl_bg_scan_check(struct work_struct *data)
942 {
943 struct iwl_priv *priv =
944 container_of(data, struct iwl_priv, scan_check.work);
945
946 IWL_DEBUG_SCAN(priv, "Scan check work\n");
947
948 /* Since we are here firmware does not finish scan and
949 * most likely is in bad shape, so we don't bother to
950 * send abort command, just force scan complete to mac80211 */
951 mutex_lock(&priv->shrd->mutex);
952 iwl_force_scan_end(priv);
953 mutex_unlock(&priv->shrd->mutex);
954 }
955
956 /**
957 * iwl_fill_probe_req - fill in all required fields and IE for probe request
958 */
959
960 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
961 const u8 *ta, const u8 *ies, int ie_len, int left)
962 {
963 int len = 0;
964 u8 *pos = NULL;
965
966 /* Make sure there is enough space for the probe request,
967 * two mandatory IEs and the data */
968 left -= 24;
969 if (left < 0)
970 return 0;
971
972 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
973 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
974 memcpy(frame->sa, ta, ETH_ALEN);
975 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
976 frame->seq_ctrl = 0;
977
978 len += 24;
979
980 /* ...next IE... */
981 pos = &frame->u.probe_req.variable[0];
982
983 /* fill in our indirect SSID IE */
984 left -= 2;
985 if (left < 0)
986 return 0;
987 *pos++ = WLAN_EID_SSID;
988 *pos++ = 0;
989
990 len += 2;
991
992 if (WARN_ON(left < ie_len))
993 return len;
994
995 if (ies && ie_len) {
996 memcpy(pos, ies, ie_len);
997 len += ie_len;
998 }
999
1000 return (u16)len;
1001 }
1002
1003 static void iwl_bg_abort_scan(struct work_struct *work)
1004 {
1005 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1006
1007 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1008
1009 /* We keep scan_check work queued in case when firmware will not
1010 * report back scan completed notification */
1011 mutex_lock(&priv->shrd->mutex);
1012 iwl_scan_cancel_timeout(priv, 200);
1013 mutex_unlock(&priv->shrd->mutex);
1014 }
1015
1016 static void iwl_process_scan_complete(struct iwl_priv *priv)
1017 {
1018 bool aborted;
1019
1020 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
1021
1022 cancel_delayed_work(&priv->scan_check);
1023
1024 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
1025 if (aborted)
1026 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
1027
1028 if (!test_and_clear_bit(STATUS_SCANNING, &priv->shrd->status)) {
1029 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
1030 goto out_settings;
1031 }
1032
1033 if (priv->scan_type == IWL_SCAN_ROC) {
1034 ieee80211_remain_on_channel_expired(priv->hw);
1035 priv->hw_roc_channel = NULL;
1036 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
1037 }
1038
1039 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
1040 int err;
1041
1042 /* Check if mac80211 requested scan during our internal scan */
1043 if (priv->scan_request == NULL)
1044 goto out_complete;
1045
1046 /* If so request a new scan */
1047 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
1048 priv->scan_request->channels[0]->band);
1049 if (err) {
1050 IWL_DEBUG_SCAN(priv,
1051 "failed to initiate pending scan: %d\n", err);
1052 aborted = true;
1053 goto out_complete;
1054 }
1055
1056 return;
1057 }
1058
1059 out_complete:
1060 iwl_complete_scan(priv, aborted);
1061
1062 out_settings:
1063 /* Can we still talk to firmware ? */
1064 if (!iwl_is_ready_rf(priv->shrd))
1065 return;
1066
1067 iwlagn_post_scan(priv);
1068 }
1069
1070 static void iwl_bg_scan_completed(struct work_struct *work)
1071 {
1072 struct iwl_priv *priv =
1073 container_of(work, struct iwl_priv, scan_completed);
1074
1075 mutex_lock(&priv->shrd->mutex);
1076 iwl_process_scan_complete(priv);
1077 mutex_unlock(&priv->shrd->mutex);
1078 }
1079
1080 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1081 {
1082 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
1083 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
1084 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
1085 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1086 }
1087
1088 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1089 {
1090 cancel_work_sync(&priv->start_internal_scan);
1091 cancel_work_sync(&priv->abort_scan);
1092 cancel_work_sync(&priv->scan_completed);
1093
1094 if (cancel_delayed_work_sync(&priv->scan_check)) {
1095 mutex_lock(&priv->shrd->mutex);
1096 iwl_force_scan_end(priv);
1097 mutex_unlock(&priv->shrd->mutex);
1098 }
1099 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree