1 /******************************************************************************
5 * Copyright(c) 2008 - 2010 Intel Corporation. All rights reserved.
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.
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.
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,
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
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>
33 #include "iwl-eeprom.h"
38 #include "iwl-helpers.h"
40 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
41 * sending probe req. This should be set long enough to hear probe responses
42 * from more than one AP. */
43 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
44 #define IWL_ACTIVE_DWELL_TIME_52 (20)
46 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
47 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
49 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
50 * Must be set longer than active dwell time.
51 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
52 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
53 #define IWL_PASSIVE_DWELL_TIME_52 (10)
54 #define IWL_PASSIVE_DWELL_BASE (100)
55 #define IWL_CHANNEL_TUNE_TIME 5
57 static int iwl_send_scan_abort(struct iwl_priv *priv)
60 struct iwl_rx_packet *pkt;
61 struct iwl_host_cmd cmd = {
62 .id = REPLY_SCAN_ABORT_CMD,
63 .flags = CMD_WANT_SKB,
66 /* Exit instantly with error when device is not ready
67 * to receive scan abort command or it does not perform
68 * hardware scan currently */
69 if (!test_bit(STATUS_READY, &priv->status) ||
70 !test_bit(STATUS_GEO_CONFIGURED, &priv->status) ||
71 !test_bit(STATUS_SCAN_HW, &priv->status) ||
72 test_bit(STATUS_FW_ERROR, &priv->status) ||
73 test_bit(STATUS_EXIT_PENDING, &priv->status))
76 ret = iwl_send_cmd_sync(priv, &cmd);
80 pkt = (struct iwl_rx_packet *)cmd.reply_page;
81 if (pkt->u.status != CAN_ABORT_STATUS) {
82 /* The scan abort will return 1 for success or
83 * 2 for "failure". A failure condition can be
84 * due to simply not being in an active scan which
85 * can occur if we send the scan abort before we
86 * the microcode has notified us that a scan is
88 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
92 iwl_free_pages(priv, cmd.reply_page);
96 static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
98 /* check if scan was requested from mac80211 */
99 if (priv->scan_request) {
100 IWL_DEBUG_SCAN(priv, "Complete scan in mac80211\n");
101 ieee80211_scan_completed(priv->hw, aborted);
104 priv->is_internal_short_scan = false;
105 priv->scan_vif = NULL;
106 priv->scan_request = NULL;
109 void iwl_force_scan_end(struct iwl_priv *priv)
111 lockdep_assert_held(&priv->mutex);
113 if (!test_bit(STATUS_SCANNING, &priv->status)) {
114 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
118 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
119 clear_bit(STATUS_SCANNING, &priv->status);
120 clear_bit(STATUS_SCAN_HW, &priv->status);
121 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
122 iwl_complete_scan(priv, true);
125 static void iwl_do_scan_abort(struct iwl_priv *priv)
129 lockdep_assert_held(&priv->mutex);
131 if (!test_bit(STATUS_SCANNING, &priv->status)) {
132 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
136 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
137 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
141 ret = iwl_send_scan_abort(priv);
143 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
144 iwl_force_scan_end(priv);
146 IWL_DEBUG_SCAN(priv, "Sucessfully send scan abort\n");
150 * iwl_scan_cancel - Cancel any currently executing HW scan
152 int iwl_scan_cancel(struct iwl_priv *priv)
154 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
155 queue_work(priv->workqueue, &priv->abort_scan);
160 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
161 * @ms: amount of time to wait (in milliseconds) for scan to abort
164 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
166 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
168 lockdep_assert_held(&priv->mutex);
170 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
172 iwl_do_scan_abort(priv);
174 while (time_before_eq(jiffies, timeout)) {
175 if (!test_bit(STATUS_SCAN_HW, &priv->status))
180 return test_bit(STATUS_SCAN_HW, &priv->status);
183 /* Service response to REPLY_SCAN_CMD (0x80) */
184 static void iwl_rx_reply_scan(struct iwl_priv *priv,
185 struct iwl_rx_mem_buffer *rxb)
187 #ifdef CONFIG_IWLWIFI_DEBUG
188 struct iwl_rx_packet *pkt = rxb_addr(rxb);
189 struct iwl_scanreq_notification *notif =
190 (struct iwl_scanreq_notification *)pkt->u.raw;
192 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
196 /* Service SCAN_START_NOTIFICATION (0x82) */
197 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
198 struct iwl_rx_mem_buffer *rxb)
200 struct iwl_rx_packet *pkt = rxb_addr(rxb);
201 struct iwl_scanstart_notification *notif =
202 (struct iwl_scanstart_notification *)pkt->u.raw;
203 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
204 IWL_DEBUG_SCAN(priv, "Scan start: "
206 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
208 notif->band ? "bg" : "a",
209 le32_to_cpu(notif->tsf_high),
210 le32_to_cpu(notif->tsf_low),
211 notif->status, notif->beacon_timer);
214 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
215 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
216 struct iwl_rx_mem_buffer *rxb)
218 #ifdef CONFIG_IWLWIFI_DEBUG
219 struct iwl_rx_packet *pkt = rxb_addr(rxb);
220 struct iwl_scanresults_notification *notif =
221 (struct iwl_scanresults_notification *)pkt->u.raw;
223 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
225 "(TSF: 0x%08X:%08X) - %d "
226 "elapsed=%lu usec\n",
228 notif->band ? "bg" : "a",
229 le32_to_cpu(notif->tsf_high),
230 le32_to_cpu(notif->tsf_low),
231 le32_to_cpu(notif->statistics[0]),
232 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
236 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
237 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
238 struct iwl_rx_mem_buffer *rxb)
240 struct iwl_rx_packet *pkt = rxb_addr(rxb);
241 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
243 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
244 scan_notif->scanned_channels,
246 scan_notif->tsf_high, scan_notif->status);
248 /* The HW is no longer scanning */
249 clear_bit(STATUS_SCAN_HW, &priv->status);
251 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
252 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
253 jiffies_to_msecs(jiffies - priv->scan_start));
255 queue_work(priv->workqueue, &priv->scan_completed);
257 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
258 iwl_advanced_bt_coexist(priv) &&
259 priv->bt_status != scan_notif->bt_status) {
260 if (scan_notif->bt_status) {
262 if (!priv->bt_ch_announce)
263 priv->bt_traffic_load =
264 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
266 * otherwise, no traffic load information provided
271 priv->bt_traffic_load =
272 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
274 priv->bt_status = scan_notif->bt_status;
275 queue_work(priv->workqueue, &priv->bt_traffic_change_work);
279 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
282 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
283 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
284 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
285 iwl_rx_scan_results_notif;
286 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
287 iwl_rx_scan_complete_notif;
290 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
291 enum ieee80211_band band,
294 if (band == IEEE80211_BAND_5GHZ)
295 return IWL_ACTIVE_DWELL_TIME_52 +
296 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
298 return IWL_ACTIVE_DWELL_TIME_24 +
299 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
302 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
303 enum ieee80211_band band,
304 struct ieee80211_vif *vif)
306 struct iwl_rxon_context *ctx;
307 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
308 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
309 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
311 if (iwl_is_any_associated(priv)) {
313 * If we're associated, we clamp the maximum passive
314 * dwell time to be 98% of the smallest beacon interval
315 * (minus 2 * channel tune time)
317 for_each_context(priv, ctx) {
320 if (!iwl_is_associated_ctx(ctx))
322 value = ctx->vif ? ctx->vif->bss_conf.beacon_int : 0;
323 if ((value > IWL_PASSIVE_DWELL_BASE) || !value)
324 value = IWL_PASSIVE_DWELL_BASE;
325 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
326 passive = min(value, passive);
333 void iwl_init_scan_params(struct iwl_priv *priv)
335 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
336 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
337 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
338 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
339 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
342 static int __must_check iwl_scan_initiate(struct iwl_priv *priv,
343 struct ieee80211_vif *vif,
345 enum ieee80211_band band)
349 lockdep_assert_held(&priv->mutex);
351 if (WARN_ON(!priv->cfg->ops->utils->request_scan))
354 cancel_delayed_work(&priv->scan_check);
356 if (!iwl_is_ready_rf(priv)) {
357 IWL_WARN(priv, "Request scan called when driver not ready.\n");
361 if (test_bit(STATUS_SCAN_HW, &priv->status)) {
363 "Multiple concurrent scan requests in parallel.\n");
367 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
368 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
372 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
373 internal ? "internal short " : "");
375 set_bit(STATUS_SCANNING, &priv->status);
376 priv->is_internal_short_scan = internal;
377 priv->scan_start = jiffies;
378 priv->scan_band = band;
380 ret = priv->cfg->ops->utils->request_scan(priv, vif);
382 clear_bit(STATUS_SCANNING, &priv->status);
383 priv->is_internal_short_scan = false;
387 queue_delayed_work(priv->workqueue, &priv->scan_check,
388 IWL_SCAN_CHECK_WATCHDOG);
393 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
394 struct ieee80211_vif *vif,
395 struct cfg80211_scan_request *req)
397 struct iwl_priv *priv = hw->priv;
400 IWL_DEBUG_MAC80211(priv, "enter\n");
402 if (req->n_channels == 0)
405 mutex_lock(&priv->mutex);
407 if (test_bit(STATUS_SCANNING, &priv->status) &&
408 !priv->is_internal_short_scan) {
409 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
414 /* mac80211 will only ask for one band at a time */
415 priv->scan_request = req;
416 priv->scan_vif = vif;
419 * If an internal scan is in progress, just set
420 * up the scan_request as per above.
422 if (priv->is_internal_short_scan) {
423 IWL_DEBUG_SCAN(priv, "SCAN request during internal scan\n");
426 ret = iwl_scan_initiate(priv, vif, false,
427 req->channels[0]->band);
429 IWL_DEBUG_MAC80211(priv, "leave\n");
432 mutex_unlock(&priv->mutex);
438 * internal short scan, this function should only been called while associated.
439 * It will reset and tune the radio to prevent possible RF related problem
441 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
443 queue_work(priv->workqueue, &priv->start_internal_scan);
446 static void iwl_bg_start_internal_scan(struct work_struct *work)
448 struct iwl_priv *priv =
449 container_of(work, struct iwl_priv, start_internal_scan);
451 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
453 mutex_lock(&priv->mutex);
455 if (priv->is_internal_short_scan == true) {
456 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
460 if (test_bit(STATUS_SCANNING, &priv->status)) {
461 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
465 if (iwl_scan_initiate(priv, NULL, true, priv->band))
466 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
468 mutex_unlock(&priv->mutex);
471 static void iwl_bg_scan_check(struct work_struct *data)
473 struct iwl_priv *priv =
474 container_of(data, struct iwl_priv, scan_check.work);
476 IWL_DEBUG_SCAN(priv, "Scan check work\n");
478 /* Since we are here firmware does not finish scan and
479 * most likely is in bad shape, so we don't bother to
480 * send abort command, just force scan complete to mac80211 */
481 mutex_lock(&priv->mutex);
482 iwl_force_scan_end(priv);
483 mutex_unlock(&priv->mutex);
487 * iwl_fill_probe_req - fill in all required fields and IE for probe request
490 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
491 const u8 *ta, const u8 *ies, int ie_len, int left)
496 /* Make sure there is enough space for the probe request,
497 * two mandatory IEs and the data */
502 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
503 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
504 memcpy(frame->sa, ta, ETH_ALEN);
505 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
511 pos = &frame->u.probe_req.variable[0];
513 /* fill in our indirect SSID IE */
517 *pos++ = WLAN_EID_SSID;
522 if (WARN_ON(left < ie_len))
526 memcpy(pos, ies, ie_len);
533 static void iwl_bg_abort_scan(struct work_struct *work)
535 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
537 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
539 /* We keep scan_check work queued in case when firmware will not
540 * report back scan completed notification */
541 mutex_lock(&priv->mutex);
542 iwl_scan_cancel_timeout(priv, 200);
543 mutex_unlock(&priv->mutex);
546 static void iwl_bg_scan_completed(struct work_struct *work)
548 struct iwl_priv *priv =
549 container_of(work, struct iwl_priv, scan_completed);
552 IWL_DEBUG_SCAN(priv, "Completed %sscan.\n",
553 priv->is_internal_short_scan ? "internal short " : "");
555 cancel_delayed_work(&priv->scan_check);
557 mutex_lock(&priv->mutex);
559 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status);
561 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
563 if (!test_and_clear_bit(STATUS_SCANNING, &priv->status)) {
564 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
568 if (priv->is_internal_short_scan && !aborted) {
571 /* Check if mac80211 requested scan during our internal scan */
572 if (priv->scan_request == NULL)
575 /* If so request a new scan */
576 err = iwl_scan_initiate(priv, priv->scan_vif, false,
577 priv->scan_request->channels[0]->band);
580 "failed to initiate pending scan: %d\n", err);
589 iwl_complete_scan(priv, aborted);
592 /* Can we still talk to firmware ? */
593 if (!iwl_is_ready_rf(priv))
597 * We do not commit power settings while scan is pending,
598 * do it now if the settings changed.
600 iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
601 iwl_set_tx_power(priv, priv->tx_power_next, false);
603 priv->cfg->ops->utils->post_scan(priv);
606 mutex_unlock(&priv->mutex);
609 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
611 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
612 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
613 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
614 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
617 void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
619 cancel_work_sync(&priv->start_internal_scan);
620 cancel_work_sync(&priv->abort_scan);
621 cancel_work_sync(&priv->scan_completed);
623 if (cancel_delayed_work_sync(&priv->scan_check)) {
624 mutex_lock(&priv->mutex);
625 iwl_force_scan_end(priv);
626 mutex_unlock(&priv->mutex);