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iwlwifi: remove uneeded declarations
[linux/fpc-iii.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
blobd026aaf6233570cd715fd8139ecdbab6300cd4c2
1 /******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
5 * Copyright(c) 2008 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 * Tomas Winkler <tomas.winkler@intel.com>
26 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
28 #include <net/mac80211.h>
29 #include <linux/etherdevice.h>
30
31 #include "iwl-eeprom.h"
32 #include "iwl-dev.h"
33 #include "iwl-core.h"
34 #include "iwl-sta.h"
35 #include "iwl-io.h"
36 #include "iwl-helpers.h"
37
38 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
39 * sending probe req. This should be set long enough to hear probe responses
40 * from more than one AP. */
41 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
42 #define IWL_ACTIVE_DWELL_TIME_52 (20)
43
44 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
45 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
46
47 /* For faster active scanning, scan will move to the next channel if fewer than
48 * PLCP_QUIET_THRESH packets are heard on this channel within
49 * ACTIVE_QUIET_TIME after sending probe request. This shortens the dwell
50 * time if it's a quiet channel (nothing responded to our probe, and there's
51 * no other traffic).
52 * Disable "quiet" feature by setting PLCP_QUIET_THRESH to 0. */
53 #define IWL_PLCP_QUIET_THRESH __constant_cpu_to_le16(1) /* packets */
54 #define IWL_ACTIVE_QUIET_TIME __constant_cpu_to_le16(10) /* msec */
55
56 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
57 * Must be set longer than active dwell time.
58 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
59 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
60 #define IWL_PASSIVE_DWELL_TIME_52 (10)
61 #define IWL_PASSIVE_DWELL_BASE (100)
62 #define IWL_CHANNEL_TUNE_TIME 5
63
64 #define IWL_SCAN_PROBE_MASK(n) cpu_to_le32((BIT(n) | (BIT(n) - BIT(1))))
65
66
67 static int scan_tx_ant[3] = {
68 RATE_MCS_ANT_A_MSK, RATE_MCS_ANT_B_MSK, RATE_MCS_ANT_C_MSK
69 };
70
71
72
73 static int iwl_is_empty_essid(const char *essid, int essid_len)
74 {
75 /* Single white space is for Linksys APs */
76 if (essid_len == 1 && essid[0] == ' ')
77 return 1;
78
79 /* Otherwise, if the entire essid is 0, we assume it is hidden */
80 while (essid_len) {
81 essid_len--;
82 if (essid[essid_len] != '\0')
83 return 0;
84 }
85
86 return 1;
87 }
88
89
90
91 static const char *iwl_escape_essid(const char *essid, u8 essid_len)
92 {
93 static char escaped[IW_ESSID_MAX_SIZE * 2 + 1];
94 const char *s = essid;
95 char *d = escaped;
96
97 if (iwl_is_empty_essid(essid, essid_len)) {
98 memcpy(escaped, "<hidden>", sizeof("<hidden>"));
99 return escaped;
100 }
101
102 essid_len = min(essid_len, (u8) IW_ESSID_MAX_SIZE);
103 while (essid_len--) {
104 if (*s == '\0') {
105 *d++ = '\\';
106 *d++ = '0';
107 s++;
108 } else
109 *d++ = *s++;
110 }
111 *d = '\0';
112 return escaped;
113 }
114
115 /**
116 * iwl_scan_cancel - Cancel any currently executing HW scan
117 *
118 * NOTE: priv->mutex is not required before calling this function
119 */
120 int iwl_scan_cancel(struct iwl_priv *priv)
121 {
122 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
123 clear_bit(STATUS_SCANNING, &priv->status);
124 return 0;
125 }
126
127 if (test_bit(STATUS_SCANNING, &priv->status)) {
128 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
129 IWL_DEBUG_SCAN("Queuing scan abort.\n");
130 set_bit(STATUS_SCAN_ABORTING, &priv->status);
131 queue_work(priv->workqueue, &priv->abort_scan);
132
133 } else
134 IWL_DEBUG_SCAN("Scan abort already in progress.\n");
135
136 return test_bit(STATUS_SCANNING, &priv->status);
137 }
138
139 return 0;
140 }
141 EXPORT_SYMBOL(iwl_scan_cancel);
142 /**
143 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
144 * @ms: amount of time to wait (in milliseconds) for scan to abort
145 *
146 * NOTE: priv->mutex must be held before calling this function
147 */
148 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
149 {
150 unsigned long now = jiffies;
151 int ret;
152
153 ret = iwl_scan_cancel(priv);
154 if (ret && ms) {
155 mutex_unlock(&priv->mutex);
156 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
157 test_bit(STATUS_SCANNING, &priv->status))
158 msleep(1);
159 mutex_lock(&priv->mutex);
160
161 return test_bit(STATUS_SCANNING, &priv->status);
162 }
163
164 return ret;
165 }
166 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
167
168 static int iwl_send_scan_abort(struct iwl_priv *priv)
169 {
170 int ret = 0;
171 struct iwl_rx_packet *res;
172 struct iwl_host_cmd cmd = {
173 .id = REPLY_SCAN_ABORT_CMD,
174 .meta.flags = CMD_WANT_SKB,
175 };
176
177 /* If there isn't a scan actively going on in the hardware
178 * then we are in between scan bands and not actually
179 * actively scanning, so don't send the abort command */
180 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
181 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
182 return 0;
183 }
184
185 ret = iwl_send_cmd_sync(priv, &cmd);
186 if (ret) {
187 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
188 return ret;
189 }
190
191 res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
192 if (res->u.status != CAN_ABORT_STATUS) {
193 /* The scan abort will return 1 for success or
194 * 2 for "failure". A failure condition can be
195 * due to simply not being in an active scan which
196 * can occur if we send the scan abort before we
197 * the microcode has notified us that a scan is
198 * completed. */
199 IWL_DEBUG_INFO("SCAN_ABORT returned %d.\n", res->u.status);
200 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
201 clear_bit(STATUS_SCAN_HW, &priv->status);
202 }
203
204 priv->alloc_rxb_skb--;
205 dev_kfree_skb_any(cmd.meta.u.skb);
206
207 return ret;
208 }
209
210
211 /* Service response to REPLY_SCAN_CMD (0x80) */
212 static void iwl_rx_reply_scan(struct iwl_priv *priv,
213 struct iwl_rx_mem_buffer *rxb)
214 {
215 #ifdef CONFIG_IWLWIFI_DEBUG
216 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
217 struct iwl_scanreq_notification *notif =
218 (struct iwl_scanreq_notification *)pkt->u.raw;
219
220 IWL_DEBUG_RX("Scan request status = 0x%x\n", notif->status);
221 #endif
222 }
223
224 /* Service SCAN_START_NOTIFICATION (0x82) */
225 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
226 struct iwl_rx_mem_buffer *rxb)
227 {
228 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
229 struct iwl_scanstart_notification *notif =
230 (struct iwl_scanstart_notification *)pkt->u.raw;
231 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
232 IWL_DEBUG_SCAN("Scan start: "
233 "%d [802.11%s] "
234 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
235 notif->channel,
236 notif->band ? "bg" : "a",
237 le32_to_cpu(notif->tsf_high),
238 le32_to_cpu(notif->tsf_low),
239 notif->status, notif->beacon_timer);
240 }
241
242 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
243 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
244 struct iwl_rx_mem_buffer *rxb)
245 {
246 #ifdef CONFIG_IWLWIFI_DEBUG
247 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
248 struct iwl_scanresults_notification *notif =
249 (struct iwl_scanresults_notification *)pkt->u.raw;
250
251 IWL_DEBUG_SCAN("Scan ch.res: "
252 "%d [802.11%s] "
253 "(TSF: 0x%08X:%08X) - %d "
254 "elapsed=%lu usec (%dms since last)\n",
255 notif->channel,
256 notif->band ? "bg" : "a",
257 le32_to_cpu(notif->tsf_high),
258 le32_to_cpu(notif->tsf_low),
259 le32_to_cpu(notif->statistics[0]),
260 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf,
261 jiffies_to_msecs(elapsed_jiffies
262 (priv->last_scan_jiffies, jiffies)));
263 #endif
264
265 priv->last_scan_jiffies = jiffies;
266 priv->next_scan_jiffies = 0;
267 }
268
269 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
270 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
271 struct iwl_rx_mem_buffer *rxb)
272 {
273 #ifdef CONFIG_IWLWIFI_DEBUG
274 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
275 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
276
277 IWL_DEBUG_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
278 scan_notif->scanned_channels,
279 scan_notif->tsf_low,
280 scan_notif->tsf_high, scan_notif->status);
281 #endif
282
283 /* The HW is no longer scanning */
284 clear_bit(STATUS_SCAN_HW, &priv->status);
285
286 /* The scan completion notification came in, so kill that timer... */
287 cancel_delayed_work(&priv->scan_check);
288
289 IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n",
290 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
291 "2.4" : "5.2",
292 jiffies_to_msecs(elapsed_jiffies
293 (priv->scan_pass_start, jiffies)));
294
295 /* Remove this scanned band from the list of pending
296 * bands to scan, band G precedes A in order of scanning
297 * as seen in iwl_bg_request_scan */
298 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
299 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
300 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
301 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
302
303 /* If a request to abort was given, or the scan did not succeed
304 * then we reset the scan state machine and terminate,
305 * re-queuing another scan if one has been requested */
306 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
307 IWL_DEBUG_INFO("Aborted scan completed.\n");
308 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
309 } else {
310 /* If there are more bands on this scan pass reschedule */
311 if (priv->scan_bands)
312 goto reschedule;
313 }
314
315 priv->last_scan_jiffies = jiffies;
316 priv->next_scan_jiffies = 0;
317 IWL_DEBUG_INFO("Setting scan to off\n");
318
319 clear_bit(STATUS_SCANNING, &priv->status);
320
321 IWL_DEBUG_INFO("Scan took %dms\n",
322 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
323
324 queue_work(priv->workqueue, &priv->scan_completed);
325
326 return;
327
328 reschedule:
329 priv->scan_pass_start = jiffies;
330 queue_work(priv->workqueue, &priv->request_scan);
331 }
332
333 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
334 {
335 /* scan handlers */
336 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
337 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
338 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
339 iwl_rx_scan_results_notif;
340 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
341 iwl_rx_scan_complete_notif;
342 }
343 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
344
345 static inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
346 enum ieee80211_band band,
347 u8 n_probes)
348 {
349 if (band == IEEE80211_BAND_5GHZ)
350 return IWL_ACTIVE_DWELL_TIME_52 +
351 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
352 else
353 return IWL_ACTIVE_DWELL_TIME_24 +
354 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
355 }
356
357 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
358 enum ieee80211_band band)
359 {
360 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
361 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
362 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
363
364 if (iwl_is_associated(priv)) {
365 /* If we're associated, we clamp the maximum passive
366 * dwell time to be 98% of the beacon interval (minus
367 * 2 * channel tune time) */
368 passive = priv->beacon_int;
369 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
370 passive = IWL_PASSIVE_DWELL_BASE;
371 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
372 }
373
374 return passive;
375 }
376
377 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
378 enum ieee80211_band band,
379 u8 is_active, u8 n_probes,
380 struct iwl_scan_channel *scan_ch)
381 {
382 const struct ieee80211_channel *channels = NULL;
383 const struct ieee80211_supported_band *sband;
384 const struct iwl_channel_info *ch_info;
385 u16 passive_dwell = 0;
386 u16 active_dwell = 0;
387 int added, i;
388 u16 channel;
389
390 sband = iwl_get_hw_mode(priv, band);
391 if (!sband)
392 return 0;
393
394 channels = sband->channels;
395
396 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
397 passive_dwell = iwl_get_passive_dwell_time(priv, band);
398
399 if (passive_dwell <= active_dwell)
400 passive_dwell = active_dwell + 1;
401
402 for (i = 0, added = 0; i < sband->n_channels; i++) {
403 if (channels[i].flags & IEEE80211_CHAN_DISABLED)
404 continue;
405
406 channel =
407 ieee80211_frequency_to_channel(channels[i].center_freq);
408 scan_ch->channel = cpu_to_le16(channel);
409
410 ch_info = iwl_get_channel_info(priv, band, channel);
411 if (!is_channel_valid(ch_info)) {
412 IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n",
413 channel);
414 continue;
415 }
416
417 if (!is_active || is_channel_passive(ch_info) ||
418 (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
419 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
420 else
421 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
422
423 if (n_probes)
424 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
425
426 scan_ch->active_dwell = cpu_to_le16(active_dwell);
427 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
428
429 /* Set txpower levels to defaults */
430 scan_ch->dsp_atten = 110;
431
432 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
433 * power level:
434 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
435 */
436 if (band == IEEE80211_BAND_5GHZ)
437 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
438 else
439 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
440
441 IWL_DEBUG_SCAN("Scanning ch=%d prob=0x%X [%s %d]\n",
442 channel, le32_to_cpu(scan_ch->type),
443 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
444 "ACTIVE" : "PASSIVE",
445 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
446 active_dwell : passive_dwell);
447
448 scan_ch++;
449 added++;
450 }
451
452 IWL_DEBUG_SCAN("total channels to scan %d \n", added);
453 return added;
454 }
455
456 void iwl_init_scan_params(struct iwl_priv *priv)
457 {
458 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
459 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = RATE_MCS_ANT_INIT_IND;
460 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
461 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = RATE_MCS_ANT_INIT_IND;
462 }
463
464 int iwl_scan_initiate(struct iwl_priv *priv)
465 {
466 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
467 IWL_ERROR("APs don't scan.\n");
468 return 0;
469 }
470
471 if (!iwl_is_ready_rf(priv)) {
472 IWL_DEBUG_SCAN("Aborting scan due to not ready.\n");
473 return -EIO;
474 }
475
476 if (test_bit(STATUS_SCANNING, &priv->status)) {
477 IWL_DEBUG_SCAN("Scan already in progress.\n");
478 return -EAGAIN;
479 }
480
481 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
482 IWL_DEBUG_SCAN("Scan request while abort pending. "
483 "Queuing.\n");
484 return -EAGAIN;
485 }
486
487 IWL_DEBUG_INFO("Starting scan...\n");
488 if (priv->cfg->sku & IWL_SKU_G)
489 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
490 if (priv->cfg->sku & IWL_SKU_A)
491 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
492 set_bit(STATUS_SCANNING, &priv->status);
493 priv->scan_start = jiffies;
494 priv->scan_pass_start = priv->scan_start;
495
496 queue_work(priv->workqueue, &priv->request_scan);
497
498 return 0;
499 }
500 EXPORT_SYMBOL(iwl_scan_initiate);
501
502 #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
503
504 static void iwl_bg_scan_check(struct work_struct *data)
505 {
506 struct iwl_priv *priv =
507 container_of(data, struct iwl_priv, scan_check.work);
508
509 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
510 return;
511
512 mutex_lock(&priv->mutex);
513 if (test_bit(STATUS_SCANNING, &priv->status) ||
514 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
515 IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting "
516 "adapter (%dms)\n",
517 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
518
519 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
520 iwl_send_scan_abort(priv);
521 }
522 mutex_unlock(&priv->mutex);
523 }
524 /**
525 * iwl_supported_rate_to_ie - fill in the supported rate in IE field
526 *
527 * return : set the bit for each supported rate insert in ie
528 */
529 static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
530 u16 basic_rate, int *left)
531 {
532 u16 ret_rates = 0, bit;
533 int i;
534 u8 *cnt = ie;
535 u8 *rates = ie + 1;
536
537 for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
538 if (bit & supported_rate) {
539 ret_rates |= bit;
540 rates[*cnt] = iwl_rates[i].ieee |
541 ((bit & basic_rate) ? 0x80 : 0x00);
542 (*cnt)++;
543 (*left)--;
544 if ((*left <= 0) ||
545 (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
546 break;
547 }
548 }
549
550 return ret_rates;
551 }
552
553
554 static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
555 u8 *pos, int *left)
556 {
557 struct ieee80211_ht_cap *ht_cap;
558
559 if (!sband || !sband->ht_info.ht_supported)
560 return;
561
562 if (*left < sizeof(struct ieee80211_ht_cap))
563 return;
564
565 *pos++ = sizeof(struct ieee80211_ht_cap);
566 ht_cap = (struct ieee80211_ht_cap *) pos;
567
568 ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap);
569 memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16);
570 ht_cap->ampdu_params_info =
571 (sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) |
572 ((sband->ht_info.ampdu_density << 2) &
573 IEEE80211_HT_CAP_AMPDU_DENSITY);
574 *left -= sizeof(struct ieee80211_ht_cap);
575 }
576
577 /**
578 * iwl_fill_probe_req - fill in all required fields and IE for probe request
579 */
580
581 static u16 iwl_fill_probe_req(struct iwl_priv *priv,
582 enum ieee80211_band band,
583 struct ieee80211_mgmt *frame,
584 int left)
585 {
586 int len = 0;
587 u8 *pos = NULL;
588 u16 active_rates, ret_rates, cck_rates, active_rate_basic;
589 const struct ieee80211_supported_band *sband =
590 iwl_get_hw_mode(priv, band);
591
592
593 /* Make sure there is enough space for the probe request,
594 * two mandatory IEs and the data */
595 left -= 24;
596 if (left < 0)
597 return 0;
598
599 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
600 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
601 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
602 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
603 frame->seq_ctrl = 0;
604
605 len += 24;
606
607 /* ...next IE... */
608 pos = &frame->u.probe_req.variable[0];
609
610 /* fill in our indirect SSID IE */
611 left -= 2;
612 if (left < 0)
613 return 0;
614 *pos++ = WLAN_EID_SSID;
615 *pos++ = 0;
616
617 len += 2;
618
619 /* fill in supported rate */
620 left -= 2;
621 if (left < 0)
622 return 0;
623
624 *pos++ = WLAN_EID_SUPP_RATES;
625 *pos = 0;
626
627 /* exclude 60M rate */
628 active_rates = priv->rates_mask;
629 active_rates &= ~IWL_RATE_60M_MASK;
630
631 active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
632
633 cck_rates = IWL_CCK_RATES_MASK & active_rates;
634 ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
635 active_rate_basic, &left);
636 active_rates &= ~ret_rates;
637
638 ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
639 active_rate_basic, &left);
640 active_rates &= ~ret_rates;
641
642 len += 2 + *pos;
643 pos += (*pos) + 1;
644
645 if (active_rates == 0)
646 goto fill_end;
647
648 /* fill in supported extended rate */
649 /* ...next IE... */
650 left -= 2;
651 if (left < 0)
652 return 0;
653 /* ... fill it in... */
654 *pos++ = WLAN_EID_EXT_SUPP_RATES;
655 *pos = 0;
656 iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left);
657 if (*pos > 0) {
658 len += 2 + *pos;
659 pos += (*pos) + 1;
660 } else {
661 pos--;
662 }
663
664 fill_end:
665
666 left -= 2;
667 if (left < 0)
668 return 0;
669
670 *pos++ = WLAN_EID_HT_CAPABILITY;
671 *pos = 0;
672 iwl_ht_cap_to_ie(sband, pos, &left);
673 if (*pos > 0)
674 len += 2 + *pos;
675
676 return (u16)len;
677 }
678
679 static u32 iwl_scan_tx_ant(struct iwl_priv *priv, enum ieee80211_band band)
680 {
681 int i, ind;
682
683 ind = priv->scan_tx_ant[band];
684 for (i = 0; i < priv->hw_params.tx_chains_num; i++) {
685 ind = (ind+1) >= priv->hw_params.tx_chains_num ? 0 : ind+1;
686 if (priv->hw_params.valid_tx_ant & (1 << ind)) {
687 priv->scan_tx_ant[band] = ind;
688 break;
689 }
690 }
691 IWL_DEBUG_SCAN("select TX ANT = %c\n", 'A' + ind);
692 return scan_tx_ant[ind];
693 }
694
695
696 static void iwl_bg_request_scan(struct work_struct *data)
697 {
698 struct iwl_priv *priv =
699 container_of(data, struct iwl_priv, request_scan);
700 struct iwl_host_cmd cmd = {
701 .id = REPLY_SCAN_CMD,
702 .len = sizeof(struct iwl_scan_cmd),
703 .meta.flags = CMD_SIZE_HUGE,
704 };
705 struct iwl_scan_cmd *scan;
706 struct ieee80211_conf *conf = NULL;
707 int ret = 0;
708 u32 tx_ant;
709 u16 cmd_len;
710 enum ieee80211_band band;
711 u8 n_probes = 2;
712 u8 rx_chain = 0x7; /* bitmap: ABC chains */
713
714 conf = ieee80211_get_hw_conf(priv->hw);
715
716 mutex_lock(&priv->mutex);
717
718 if (!iwl_is_ready(priv)) {
719 IWL_WARNING("request scan called when driver not ready.\n");
720 goto done;
721 }
722
723 /* Make sure the scan wasn't cancelled before this queued work
724 * was given the chance to run... */
725 if (!test_bit(STATUS_SCANNING, &priv->status))
726 goto done;
727
728 /* This should never be called or scheduled if there is currently
729 * a scan active in the hardware. */
730 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
731 IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. "
732 "Ignoring second request.\n");
733 ret = -EIO;
734 goto done;
735 }
736
737 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
738 IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n");
739 goto done;
740 }
741
742 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
743 IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n");
744 goto done;
745 }
746
747 if (iwl_is_rfkill(priv)) {
748 IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n");
749 goto done;
750 }
751
752 if (!test_bit(STATUS_READY, &priv->status)) {
753 IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n");
754 goto done;
755 }
756
757 if (!priv->scan_bands) {
758 IWL_DEBUG_HC("Aborting scan due to no requested bands\n");
759 goto done;
760 }
761
762 if (!priv->scan) {
763 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
764 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
765 if (!priv->scan) {
766 ret = -ENOMEM;
767 goto done;
768 }
769 }
770 scan = priv->scan;
771 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
772
773 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
774 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
775
776 if (iwl_is_associated(priv)) {
777 u16 interval = 0;
778 u32 extra;
779 u32 suspend_time = 100;
780 u32 scan_suspend_time = 100;
781 unsigned long flags;
782
783 IWL_DEBUG_INFO("Scanning while associated...\n");
784
785 spin_lock_irqsave(&priv->lock, flags);
786 interval = priv->beacon_int;
787 spin_unlock_irqrestore(&priv->lock, flags);
788
789 scan->suspend_time = 0;
790 scan->max_out_time = cpu_to_le32(200 * 1024);
791 if (!interval)
792 interval = suspend_time;
793
794 extra = (suspend_time / interval) << 22;
795 scan_suspend_time = (extra |
796 ((suspend_time % interval) * 1024));
797 scan->suspend_time = cpu_to_le32(scan_suspend_time);
798 IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n",
799 scan_suspend_time, interval);
800 }
801
802 /* We should add the ability for user to lock to PASSIVE ONLY */
803 if (priv->one_direct_scan) {
804 IWL_DEBUG_SCAN("Start direct scan for '%s'\n",
805 iwl_escape_essid(priv->direct_ssid,
806 priv->direct_ssid_len));
807 scan->direct_scan[0].id = WLAN_EID_SSID;
808 scan->direct_scan[0].len = priv->direct_ssid_len;
809 memcpy(scan->direct_scan[0].ssid,
810 priv->direct_ssid, priv->direct_ssid_len);
811 n_probes++;
812 } else if (!iwl_is_associated(priv) && priv->essid_len) {
813 IWL_DEBUG_SCAN("Start direct scan for '%s' (not associated)\n",
814 iwl_escape_essid(priv->essid, priv->essid_len));
815 scan->direct_scan[0].id = WLAN_EID_SSID;
816 scan->direct_scan[0].len = priv->essid_len;
817 memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len);
818 n_probes++;
819 } else {
820 IWL_DEBUG_SCAN("Start indirect scan.\n");
821 }
822
823 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
824 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
825 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
826
827
828 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
829 band = IEEE80211_BAND_2GHZ;
830 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
831 tx_ant = iwl_scan_tx_ant(priv, band);
832 if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK)
833 scan->tx_cmd.rate_n_flags =
834 iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
835 tx_ant);
836 else
837 scan->tx_cmd.rate_n_flags =
838 iwl_hw_set_rate_n_flags(IWL_RATE_1M_PLCP,
839 tx_ant |
840 RATE_MCS_CCK_MSK);
841 scan->good_CRC_th = 0;
842 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
843 band = IEEE80211_BAND_5GHZ;
844 tx_ant = iwl_scan_tx_ant(priv, band);
845 scan->tx_cmd.rate_n_flags =
846 iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
847 tx_ant);
848 scan->good_CRC_th = IWL_GOOD_CRC_TH;
849
850 /* Force use of chains B and C (0x6) for scan Rx for 4965
851 * Avoid A (0x1) because of its off-channel reception on A-band.
852 * MIMO is not used here, but value is required */
853 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
854 rx_chain = 0x6;
855 } else {
856 IWL_WARNING("Invalid scan band count\n");
857 goto done;
858 }
859
860 scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK |
861 cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
862 (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) |
863 (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
864
865 cmd_len = iwl_fill_probe_req(priv, band,
866 (struct ieee80211_mgmt *)scan->data,
867 IWL_MAX_SCAN_SIZE - sizeof(*scan));
868
869 scan->tx_cmd.len = cpu_to_le16(cmd_len);
870
871 if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR)
872 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
873
874 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
875 RXON_FILTER_BCON_AWARE_MSK);
876
877 scan->channel_count =
878 iwl_get_channels_for_scan(priv, band, 1, /* active */
879 n_probes,
880 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
881
882 if (scan->channel_count == 0) {
883 IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count);
884 goto done;
885 }
886
887 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
888 scan->channel_count * sizeof(struct iwl_scan_channel);
889 cmd.data = scan;
890 scan->len = cpu_to_le16(cmd.len);
891
892 set_bit(STATUS_SCAN_HW, &priv->status);
893 ret = iwl_send_cmd_sync(priv, &cmd);
894 if (ret)
895 goto done;
896
897 queue_delayed_work(priv->workqueue, &priv->scan_check,
898 IWL_SCAN_CHECK_WATCHDOG);
899
900 mutex_unlock(&priv->mutex);
901 return;
902
903 done:
904 /* inform mac80211 scan aborted */
905 queue_work(priv->workqueue, &priv->scan_completed);
906 mutex_unlock(&priv->mutex);
907 }
908
909 static void iwl_bg_abort_scan(struct work_struct *work)
910 {
911 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
912
913 if (!iwl_is_ready(priv))
914 return;
915
916 mutex_lock(&priv->mutex);
917
918 set_bit(STATUS_SCAN_ABORTING, &priv->status);
919 iwl_send_scan_abort(priv);
920
921 mutex_unlock(&priv->mutex);
922 }
923
924 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
925 {
926 /* FIXME: move here when resolved PENDING
927 * INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); */
928 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
929 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
930 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
931 }
932 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
933
Linux with added FPC-III support