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iwlwifi: enable active scanning
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / wireless / iwlwifi / iwl-scan.c
blobefc750d2fc5ca988c7fbf5df3686da883b396422
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 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 EXPORT_SYMBOL(iwl_escape_essid);
115
116 /**
117 * iwl_scan_cancel - Cancel any currently executing HW scan
118 *
119 * NOTE: priv->mutex is not required before calling this function
120 */
121 int iwl_scan_cancel(struct iwl_priv *priv)
122 {
123 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
124 clear_bit(STATUS_SCANNING, &priv->status);
125 return 0;
126 }
127
128 if (test_bit(STATUS_SCANNING, &priv->status)) {
129 if (!test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
130 IWL_DEBUG_SCAN("Queuing scan abort.\n");
131 set_bit(STATUS_SCAN_ABORTING, &priv->status);
132 queue_work(priv->workqueue, &priv->abort_scan);
133
134 } else
135 IWL_DEBUG_SCAN("Scan abort already in progress.\n");
136
137 return test_bit(STATUS_SCANNING, &priv->status);
138 }
139
140 return 0;
141 }
142 EXPORT_SYMBOL(iwl_scan_cancel);
143 /**
144 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
145 * @ms: amount of time to wait (in milliseconds) for scan to abort
146 *
147 * NOTE: priv->mutex must be held before calling this function
148 */
149 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
150 {
151 unsigned long now = jiffies;
152 int ret;
153
154 ret = iwl_scan_cancel(priv);
155 if (ret && ms) {
156 mutex_unlock(&priv->mutex);
157 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
158 test_bit(STATUS_SCANNING, &priv->status))
159 msleep(1);
160 mutex_lock(&priv->mutex);
161
162 return test_bit(STATUS_SCANNING, &priv->status);
163 }
164
165 return ret;
166 }
167 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
168
169 static int iwl_send_scan_abort(struct iwl_priv *priv)
170 {
171 int ret = 0;
172 struct iwl_rx_packet *res;
173 struct iwl_host_cmd cmd = {
174 .id = REPLY_SCAN_ABORT_CMD,
175 .meta.flags = CMD_WANT_SKB,
176 };
177
178 /* If there isn't a scan actively going on in the hardware
179 * then we are in between scan bands and not actually
180 * actively scanning, so don't send the abort command */
181 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
182 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
183 return 0;
184 }
185
186 ret = iwl_send_cmd_sync(priv, &cmd);
187 if (ret) {
188 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
189 return ret;
190 }
191
192 res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
193 if (res->u.status != CAN_ABORT_STATUS) {
194 /* The scan abort will return 1 for success or
195 * 2 for "failure". A failure condition can be
196 * due to simply not being in an active scan which
197 * can occur if we send the scan abort before we
198 * the microcode has notified us that a scan is
199 * completed. */
200 IWL_DEBUG_INFO("SCAN_ABORT returned %d.\n", res->u.status);
201 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
202 clear_bit(STATUS_SCAN_HW, &priv->status);
203 }
204
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 struct iwl_rx_packet *pkt = (struct iwl_rx_packet *)rxb->skb->data;
274 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
275
276 IWL_DEBUG_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
277 scan_notif->scanned_channels,
278 scan_notif->tsf_low,
279 scan_notif->tsf_high, scan_notif->status);
280
281 /* The HW is no longer scanning */
282 clear_bit(STATUS_SCAN_HW, &priv->status);
283
284 /* The scan completion notification came in, so kill that timer... */
285 cancel_delayed_work(&priv->scan_check);
286
287 IWL_DEBUG_INFO("Scan pass on %sGHz took %dms\n",
288 (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) ?
289 "2.4" : "5.2",
290 jiffies_to_msecs(elapsed_jiffies
291 (priv->scan_pass_start, jiffies)));
292
293 /* Remove this scanned band from the list of pending
294 * bands to scan, band G precedes A in order of scanning
295 * as seen in iwl_bg_request_scan */
296 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ))
297 priv->scan_bands &= ~BIT(IEEE80211_BAND_2GHZ);
298 else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ))
299 priv->scan_bands &= ~BIT(IEEE80211_BAND_5GHZ);
300
301 /* If a request to abort was given, or the scan did not succeed
302 * then we reset the scan state machine and terminate,
303 * re-queuing another scan if one has been requested */
304 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
305 IWL_DEBUG_INFO("Aborted scan completed.\n");
306 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
307 } else {
308 /* If there are more bands on this scan pass reschedule */
309 if (priv->scan_bands)
310 goto reschedule;
311 }
312
313 priv->last_scan_jiffies = jiffies;
314 priv->next_scan_jiffies = 0;
315 IWL_DEBUG_INFO("Setting scan to off\n");
316
317 clear_bit(STATUS_SCANNING, &priv->status);
318
319 IWL_DEBUG_INFO("Scan took %dms\n",
320 jiffies_to_msecs(elapsed_jiffies(priv->scan_start, jiffies)));
321
322 queue_work(priv->workqueue, &priv->scan_completed);
323
324 return;
325
326 reschedule:
327 priv->scan_pass_start = jiffies;
328 queue_work(priv->workqueue, &priv->request_scan);
329 }
330
331 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
332 {
333 /* scan handlers */
334 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
335 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
336 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
337 iwl_rx_scan_results_notif;
338 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
339 iwl_rx_scan_complete_notif;
340 }
341 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
342
343 static inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
344 enum ieee80211_band band,
345 u8 n_probes)
346 {
347 if (band == IEEE80211_BAND_5GHZ)
348 return IWL_ACTIVE_DWELL_TIME_52 +
349 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
350 else
351 return IWL_ACTIVE_DWELL_TIME_24 +
352 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
353 }
354
355 static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
356 enum ieee80211_band band)
357 {
358 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
359 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
360 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
361
362 if (iwl_is_associated(priv)) {
363 /* If we're associated, we clamp the maximum passive
364 * dwell time to be 98% of the beacon interval (minus
365 * 2 * channel tune time) */
366 passive = priv->beacon_int;
367 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
368 passive = IWL_PASSIVE_DWELL_BASE;
369 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
370 }
371
372 return passive;
373 }
374
375 static int iwl_get_channels_for_scan(struct iwl_priv *priv,
376 enum ieee80211_band band,
377 u8 is_active, u8 n_probes,
378 struct iwl_scan_channel *scan_ch)
379 {
380 const struct ieee80211_channel *channels = NULL;
381 const struct ieee80211_supported_band *sband;
382 const struct iwl_channel_info *ch_info;
383 u16 passive_dwell = 0;
384 u16 active_dwell = 0;
385 int added, i;
386 u16 channel;
387
388 sband = iwl_get_hw_mode(priv, band);
389 if (!sband)
390 return 0;
391
392 channels = sband->channels;
393
394 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
395 passive_dwell = iwl_get_passive_dwell_time(priv, band);
396
397 if (passive_dwell <= active_dwell)
398 passive_dwell = active_dwell + 1;
399
400 for (i = 0, added = 0; i < sband->n_channels; i++) {
401 if (channels[i].flags & IEEE80211_CHAN_DISABLED)
402 continue;
403
404 channel =
405 ieee80211_frequency_to_channel(channels[i].center_freq);
406 scan_ch->channel = cpu_to_le16(channel);
407
408 ch_info = iwl_get_channel_info(priv, band, channel);
409 if (!is_channel_valid(ch_info)) {
410 IWL_DEBUG_SCAN("Channel %d is INVALID for this band.\n",
411 channel);
412 continue;
413 }
414
415 if (!is_active || is_channel_passive(ch_info) ||
416 (channels[i].flags & IEEE80211_CHAN_PASSIVE_SCAN))
417 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
418 else
419 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
420
421 if ((scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) && n_probes)
422 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
423
424 scan_ch->active_dwell = cpu_to_le16(active_dwell);
425 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
426
427 /* Set txpower levels to defaults */
428 scan_ch->dsp_atten = 110;
429
430 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
431 * power level:
432 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
433 */
434 if (band == IEEE80211_BAND_5GHZ)
435 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
436 else
437 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
438
439 IWL_DEBUG_SCAN("Scanning ch=%d prob=0x%X [%s %d]\n",
440 channel, le32_to_cpu(scan_ch->type),
441 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
442 "ACTIVE" : "PASSIVE",
443 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
444 active_dwell : passive_dwell);
445
446 scan_ch++;
447 added++;
448 }
449
450 IWL_DEBUG_SCAN("total channels to scan %d \n", added);
451 return added;
452 }
453
454 void iwl_init_scan_params(struct iwl_priv *priv)
455 {
456 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
457 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = RATE_MCS_ANT_INIT_IND;
458 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
459 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = RATE_MCS_ANT_INIT_IND;
460 }
461
462 int iwl_scan_initiate(struct iwl_priv *priv)
463 {
464 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
465 IWL_ERROR("APs don't scan.\n");
466 return 0;
467 }
468
469 if (!iwl_is_ready_rf(priv)) {
470 IWL_DEBUG_SCAN("Aborting scan due to not ready.\n");
471 return -EIO;
472 }
473
474 if (test_bit(STATUS_SCANNING, &priv->status)) {
475 IWL_DEBUG_SCAN("Scan already in progress.\n");
476 return -EAGAIN;
477 }
478
479 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
480 IWL_DEBUG_SCAN("Scan request while abort pending. "
481 "Queuing.\n");
482 return -EAGAIN;
483 }
484
485 IWL_DEBUG_INFO("Starting scan...\n");
486 if (priv->cfg->sku & IWL_SKU_G)
487 priv->scan_bands |= BIT(IEEE80211_BAND_2GHZ);
488 if (priv->cfg->sku & IWL_SKU_A)
489 priv->scan_bands |= BIT(IEEE80211_BAND_5GHZ);
490 set_bit(STATUS_SCANNING, &priv->status);
491 priv->scan_start = jiffies;
492 priv->scan_pass_start = priv->scan_start;
493
494 queue_work(priv->workqueue, &priv->request_scan);
495
496 return 0;
497 }
498 EXPORT_SYMBOL(iwl_scan_initiate);
499
500 #define IWL_SCAN_CHECK_WATCHDOG (7 * HZ)
501
502 static void iwl_bg_scan_check(struct work_struct *data)
503 {
504 struct iwl_priv *priv =
505 container_of(data, struct iwl_priv, scan_check.work);
506
507 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
508 return;
509
510 mutex_lock(&priv->mutex);
511 if (test_bit(STATUS_SCANNING, &priv->status) ||
512 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
513 IWL_DEBUG(IWL_DL_SCAN, "Scan completion watchdog resetting "
514 "adapter (%dms)\n",
515 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
516
517 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
518 iwl_send_scan_abort(priv);
519 }
520 mutex_unlock(&priv->mutex);
521 }
522 /**
523 * iwl_supported_rate_to_ie - fill in the supported rate in IE field
524 *
525 * return : set the bit for each supported rate insert in ie
526 */
527 static u16 iwl_supported_rate_to_ie(u8 *ie, u16 supported_rate,
528 u16 basic_rate, int *left)
529 {
530 u16 ret_rates = 0, bit;
531 int i;
532 u8 *cnt = ie;
533 u8 *rates = ie + 1;
534
535 for (bit = 1, i = 0; i < IWL_RATE_COUNT; i++, bit <<= 1) {
536 if (bit & supported_rate) {
537 ret_rates |= bit;
538 rates[*cnt] = iwl_rates[i].ieee |
539 ((bit & basic_rate) ? 0x80 : 0x00);
540 (*cnt)++;
541 (*left)--;
542 if ((*left <= 0) ||
543 (*cnt >= IWL_SUPPORTED_RATES_IE_LEN))
544 break;
545 }
546 }
547
548 return ret_rates;
549 }
550
551
552 static void iwl_ht_cap_to_ie(const struct ieee80211_supported_band *sband,
553 u8 *pos, int *left)
554 {
555 struct ieee80211_ht_cap *ht_cap;
556
557 if (!sband || !sband->ht_info.ht_supported)
558 return;
559
560 if (*left < sizeof(struct ieee80211_ht_cap))
561 return;
562
563 *pos++ = sizeof(struct ieee80211_ht_cap);
564 ht_cap = (struct ieee80211_ht_cap *) pos;
565
566 ht_cap->cap_info = cpu_to_le16(sband->ht_info.cap);
567 memcpy(ht_cap->supp_mcs_set, sband->ht_info.supp_mcs_set, 16);
568 ht_cap->ampdu_params_info =
569 (sband->ht_info.ampdu_factor & IEEE80211_HT_CAP_AMPDU_FACTOR) |
570 ((sband->ht_info.ampdu_density << 2) &
571 IEEE80211_HT_CAP_AMPDU_DENSITY);
572 *left -= sizeof(struct ieee80211_ht_cap);
573 }
574
575 /**
576 * iwl_fill_probe_req - fill in all required fields and IE for probe request
577 */
578
579 static u16 iwl_fill_probe_req(struct iwl_priv *priv,
580 enum ieee80211_band band,
581 struct ieee80211_mgmt *frame,
582 int left)
583 {
584 int len = 0;
585 u8 *pos = NULL;
586 u16 active_rates, ret_rates, cck_rates, active_rate_basic;
587 const struct ieee80211_supported_band *sband =
588 iwl_get_hw_mode(priv, band);
589
590
591 /* Make sure there is enough space for the probe request,
592 * two mandatory IEs and the data */
593 left -= 24;
594 if (left < 0)
595 return 0;
596
597 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
598 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
599 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
600 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
601 frame->seq_ctrl = 0;
602
603 len += 24;
604
605 /* ...next IE... */
606 pos = &frame->u.probe_req.variable[0];
607
608 /* fill in our indirect SSID IE */
609 left -= 2;
610 if (left < 0)
611 return 0;
612 *pos++ = WLAN_EID_SSID;
613 *pos++ = 0;
614
615 len += 2;
616
617 /* fill in supported rate */
618 left -= 2;
619 if (left < 0)
620 return 0;
621
622 *pos++ = WLAN_EID_SUPP_RATES;
623 *pos = 0;
624
625 /* exclude 60M rate */
626 active_rates = priv->rates_mask;
627 active_rates &= ~IWL_RATE_60M_MASK;
628
629 active_rate_basic = active_rates & IWL_BASIC_RATES_MASK;
630
631 cck_rates = IWL_CCK_RATES_MASK & active_rates;
632 ret_rates = iwl_supported_rate_to_ie(pos, cck_rates,
633 active_rate_basic, &left);
634 active_rates &= ~ret_rates;
635
636 ret_rates = iwl_supported_rate_to_ie(pos, active_rates,
637 active_rate_basic, &left);
638 active_rates &= ~ret_rates;
639
640 len += 2 + *pos;
641 pos += (*pos) + 1;
642
643 if (active_rates == 0)
644 goto fill_end;
645
646 /* fill in supported extended rate */
647 /* ...next IE... */
648 left -= 2;
649 if (left < 0)
650 return 0;
651 /* ... fill it in... */
652 *pos++ = WLAN_EID_EXT_SUPP_RATES;
653 *pos = 0;
654 iwl_supported_rate_to_ie(pos, active_rates, active_rate_basic, &left);
655 if (*pos > 0) {
656 len += 2 + *pos;
657 pos += (*pos) + 1;
658 } else {
659 pos--;
660 }
661
662 fill_end:
663
664 left -= 2;
665 if (left < 0)
666 return 0;
667
668 *pos++ = WLAN_EID_HT_CAPABILITY;
669 *pos = 0;
670 iwl_ht_cap_to_ie(sband, pos, &left);
671 if (*pos > 0)
672 len += 2 + *pos;
673
674 return (u16)len;
675 }
676
677 static u32 iwl_scan_tx_ant(struct iwl_priv *priv, enum ieee80211_band band)
678 {
679 int i, ind;
680
681 ind = priv->scan_tx_ant[band];
682 for (i = 0; i < priv->hw_params.tx_chains_num; i++) {
683 ind = (ind+1) >= priv->hw_params.tx_chains_num ? 0 : ind+1;
684 if (priv->hw_params.valid_tx_ant & (1 << ind)) {
685 priv->scan_tx_ant[band] = ind;
686 break;
687 }
688 }
689 IWL_DEBUG_SCAN("select TX ANT = %c\n", 'A' + ind);
690 return scan_tx_ant[ind];
691 }
692
693
694 static void iwl_bg_request_scan(struct work_struct *data)
695 {
696 struct iwl_priv *priv =
697 container_of(data, struct iwl_priv, request_scan);
698 struct iwl_host_cmd cmd = {
699 .id = REPLY_SCAN_CMD,
700 .len = sizeof(struct iwl_scan_cmd),
701 .meta.flags = CMD_SIZE_HUGE,
702 };
703 struct iwl_scan_cmd *scan;
704 struct ieee80211_conf *conf = NULL;
705 int ret = 0;
706 u32 tx_ant;
707 u16 cmd_len;
708 enum ieee80211_band band;
709 u8 n_probes = 2;
710 u8 rx_chain = 0x7; /* bitmap: ABC chains */
711
712 conf = ieee80211_get_hw_conf(priv->hw);
713
714 mutex_lock(&priv->mutex);
715
716 if (!iwl_is_ready(priv)) {
717 IWL_WARNING("request scan called when driver not ready.\n");
718 goto done;
719 }
720
721 /* Make sure the scan wasn't cancelled before this queued work
722 * was given the chance to run... */
723 if (!test_bit(STATUS_SCANNING, &priv->status))
724 goto done;
725
726 /* This should never be called or scheduled if there is currently
727 * a scan active in the hardware. */
728 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
729 IWL_DEBUG_INFO("Multiple concurrent scan requests in parallel. "
730 "Ignoring second request.\n");
731 ret = -EIO;
732 goto done;
733 }
734
735 if (test_bit(STATUS_EXIT_PENDING, &priv->status)) {
736 IWL_DEBUG_SCAN("Aborting scan due to device shutdown\n");
737 goto done;
738 }
739
740 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
741 IWL_DEBUG_HC("Scan request while abort pending. Queuing.\n");
742 goto done;
743 }
744
745 if (iwl_is_rfkill(priv)) {
746 IWL_DEBUG_HC("Aborting scan due to RF Kill activation\n");
747 goto done;
748 }
749
750 if (!test_bit(STATUS_READY, &priv->status)) {
751 IWL_DEBUG_HC("Scan request while uninitialized. Queuing.\n");
752 goto done;
753 }
754
755 if (!priv->scan_bands) {
756 IWL_DEBUG_HC("Aborting scan due to no requested bands\n");
757 goto done;
758 }
759
760 if (!priv->scan) {
761 priv->scan = kmalloc(sizeof(struct iwl_scan_cmd) +
762 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
763 if (!priv->scan) {
764 ret = -ENOMEM;
765 goto done;
766 }
767 }
768 scan = priv->scan;
769 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
770
771 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
772 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
773
774 if (iwl_is_associated(priv)) {
775 u16 interval = 0;
776 u32 extra;
777 u32 suspend_time = 100;
778 u32 scan_suspend_time = 100;
779 unsigned long flags;
780
781 IWL_DEBUG_INFO("Scanning while associated...\n");
782
783 spin_lock_irqsave(&priv->lock, flags);
784 interval = priv->beacon_int;
785 spin_unlock_irqrestore(&priv->lock, flags);
786
787 scan->suspend_time = 0;
788 scan->max_out_time = cpu_to_le32(200 * 1024);
789 if (!interval)
790 interval = suspend_time;
791
792 extra = (suspend_time / interval) << 22;
793 scan_suspend_time = (extra |
794 ((suspend_time % interval) * 1024));
795 scan->suspend_time = cpu_to_le32(scan_suspend_time);
796 IWL_DEBUG_SCAN("suspend_time 0x%X beacon interval %d\n",
797 scan_suspend_time, interval);
798 }
799
800 /* We should add the ability for user to lock to PASSIVE ONLY */
801 if (priv->one_direct_scan) {
802 IWL_DEBUG_SCAN("Start direct scan for '%s'\n",
803 iwl_escape_essid(priv->direct_ssid,
804 priv->direct_ssid_len));
805 scan->direct_scan[0].id = WLAN_EID_SSID;
806 scan->direct_scan[0].len = priv->direct_ssid_len;
807 memcpy(scan->direct_scan[0].ssid,
808 priv->direct_ssid, priv->direct_ssid_len);
809 n_probes++;
810 } else if (!iwl_is_associated(priv) && priv->essid_len) {
811 IWL_DEBUG_SCAN("Start direct scan for '%s' (not associated)\n",
812 iwl_escape_essid(priv->essid, priv->essid_len));
813 scan->direct_scan[0].id = WLAN_EID_SSID;
814 scan->direct_scan[0].len = priv->essid_len;
815 memcpy(scan->direct_scan[0].ssid, priv->essid, priv->essid_len);
816 n_probes++;
817 } else {
818 IWL_DEBUG_SCAN("Start indirect scan.\n");
819 }
820
821 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
822 scan->tx_cmd.sta_id = priv->hw_params.bcast_sta_id;
823 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
824
825
826 if (priv->scan_bands & BIT(IEEE80211_BAND_2GHZ)) {
827 band = IEEE80211_BAND_2GHZ;
828 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
829 tx_ant = iwl_scan_tx_ant(priv, band);
830 if (priv->active_rxon.flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK)
831 scan->tx_cmd.rate_n_flags =
832 iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
833 tx_ant);
834 else
835 scan->tx_cmd.rate_n_flags =
836 iwl_hw_set_rate_n_flags(IWL_RATE_1M_PLCP,
837 tx_ant |
838 RATE_MCS_CCK_MSK);
839 scan->good_CRC_th = 0;
840 } else if (priv->scan_bands & BIT(IEEE80211_BAND_5GHZ)) {
841 band = IEEE80211_BAND_5GHZ;
842 tx_ant = iwl_scan_tx_ant(priv, band);
843 scan->tx_cmd.rate_n_flags =
844 iwl_hw_set_rate_n_flags(IWL_RATE_6M_PLCP,
845 tx_ant);
846 scan->good_CRC_th = IWL_GOOD_CRC_TH;
847
848 /* Force use of chains B and C (0x6) for scan Rx for 4965
849 * Avoid A (0x1) because of its off-channel reception on A-band.
850 * MIMO is not used here, but value is required */
851 if ((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965)
852 rx_chain = 0x6;
853 } else {
854 IWL_WARNING("Invalid scan band count\n");
855 goto done;
856 }
857
858 scan->rx_chain = RXON_RX_CHAIN_DRIVER_FORCE_MSK |
859 cpu_to_le16((0x7 << RXON_RX_CHAIN_VALID_POS) |
860 (rx_chain << RXON_RX_CHAIN_FORCE_SEL_POS) |
861 (0x7 << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS));
862
863 cmd_len = iwl_fill_probe_req(priv, band,
864 (struct ieee80211_mgmt *)scan->data,
865 IWL_MAX_SCAN_SIZE - sizeof(*scan));
866
867 scan->tx_cmd.len = cpu_to_le16(cmd_len);
868
869 if (priv->iw_mode == IEEE80211_IF_TYPE_MNTR)
870 scan->filter_flags = RXON_FILTER_PROMISC_MSK;
871
872 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
873 RXON_FILTER_BCON_AWARE_MSK);
874
875 scan->channel_count =
876 iwl_get_channels_for_scan(priv, band, 1, /* active */
877 n_probes,
878 (void *)&scan->data[le16_to_cpu(scan->tx_cmd.len)]);
879
880 if (scan->channel_count == 0) {
881 IWL_DEBUG_SCAN("channel count %d\n", scan->channel_count);
882 goto done;
883 }
884
885 cmd.len += le16_to_cpu(scan->tx_cmd.len) +
886 scan->channel_count * sizeof(struct iwl_scan_channel);
887 cmd.data = scan;
888 scan->len = cpu_to_le16(cmd.len);
889
890 set_bit(STATUS_SCAN_HW, &priv->status);
891 ret = iwl_send_cmd_sync(priv, &cmd);
892 if (ret)
893 goto done;
894
895 queue_delayed_work(priv->workqueue, &priv->scan_check,
896 IWL_SCAN_CHECK_WATCHDOG);
897
898 mutex_unlock(&priv->mutex);
899 return;
900
901 done:
902 /* inform mac80211 scan aborted */
903 queue_work(priv->workqueue, &priv->scan_completed);
904 mutex_unlock(&priv->mutex);
905 }
906
907 static void iwl_bg_abort_scan(struct work_struct *work)
908 {
909 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
910
911 if (!iwl_is_ready(priv))
912 return;
913
914 mutex_lock(&priv->mutex);
915
916 set_bit(STATUS_SCAN_ABORTING, &priv->status);
917 iwl_send_scan_abort(priv);
918
919 mutex_unlock(&priv->mutex);
920 }
921
922 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
923 {
924 /* FIXME: move here when resolved PENDING
925 * INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed); */
926 INIT_WORK(&priv->request_scan, iwl_bg_request_scan);
927 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
928 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
929 }
930 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);
931
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree