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
60 * iwl_scan_cancel - Cancel any currently executing HW scan
62 * NOTE: priv->mutex is not required before calling this function
64 int iwl_scan_cancel(struct iwl_priv *priv)
66 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
67 clear_bit(STATUS_SCANNING, &priv->status);
71 if (test_bit(STATUS_SCANNING, &priv->status)) {
72 if (!test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
73 IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
74 queue_work(priv->workqueue, &priv->abort_scan);
77 IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
79 return test_bit(STATUS_SCANNING, &priv->status);
84 EXPORT_SYMBOL(iwl_scan_cancel);
86 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
87 * @ms: amount of time to wait (in milliseconds) for scan to abort
89 * NOTE: priv->mutex must be held before calling this function
91 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
93 unsigned long now = jiffies;
96 ret = iwl_scan_cancel(priv);
98 mutex_unlock(&priv->mutex);
99 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
100 test_bit(STATUS_SCANNING, &priv->status))
102 mutex_lock(&priv->mutex);
104 return test_bit(STATUS_SCANNING, &priv->status);
109 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
111 static int iwl_send_scan_abort(struct iwl_priv *priv)
114 struct iwl_rx_packet *pkt;
115 struct iwl_host_cmd cmd = {
116 .id = REPLY_SCAN_ABORT_CMD,
117 .flags = CMD_WANT_SKB,
120 /* If there isn't a scan actively going on in the hardware
121 * then we are in between scan bands and not actually
122 * actively scanning, so don't send the abort command */
123 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
124 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
128 ret = iwl_send_cmd_sync(priv, &cmd);
130 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
134 pkt = (struct iwl_rx_packet *)cmd.reply_page;
135 if (pkt->u.status != CAN_ABORT_STATUS) {
136 /* The scan abort will return 1 for success or
137 * 2 for "failure". A failure condition can be
138 * due to simply not being in an active scan which
139 * can occur if we send the scan abort before we
140 * the microcode has notified us that a scan is
142 IWL_DEBUG_INFO(priv, "SCAN_ABORT returned %d.\n", pkt->u.status);
143 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
144 clear_bit(STATUS_SCAN_HW, &priv->status);
147 iwl_free_pages(priv, cmd.reply_page);
152 /* Service response to REPLY_SCAN_CMD (0x80) */
153 static void iwl_rx_reply_scan(struct iwl_priv *priv,
154 struct iwl_rx_mem_buffer *rxb)
156 #ifdef CONFIG_IWLWIFI_DEBUG
157 struct iwl_rx_packet *pkt = rxb_addr(rxb);
158 struct iwl_scanreq_notification *notif =
159 (struct iwl_scanreq_notification *)pkt->u.raw;
161 IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
165 /* Service SCAN_START_NOTIFICATION (0x82) */
166 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
167 struct iwl_rx_mem_buffer *rxb)
169 struct iwl_rx_packet *pkt = rxb_addr(rxb);
170 struct iwl_scanstart_notification *notif =
171 (struct iwl_scanstart_notification *)pkt->u.raw;
172 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
173 IWL_DEBUG_SCAN(priv, "Scan start: "
175 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
177 notif->band ? "bg" : "a",
178 le32_to_cpu(notif->tsf_high),
179 le32_to_cpu(notif->tsf_low),
180 notif->status, notif->beacon_timer);
183 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
184 static void iwl_rx_scan_results_notif(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_scanresults_notification *notif =
190 (struct iwl_scanresults_notification *)pkt->u.raw;
192 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
194 "(TSF: 0x%08X:%08X) - %d "
195 "elapsed=%lu usec\n",
197 notif->band ? "bg" : "a",
198 le32_to_cpu(notif->tsf_high),
199 le32_to_cpu(notif->tsf_low),
200 le32_to_cpu(notif->statistics[0]),
201 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
205 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
206 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
207 struct iwl_rx_mem_buffer *rxb)
209 #ifdef CONFIG_IWLWIFI_DEBUG
210 struct iwl_rx_packet *pkt = rxb_addr(rxb);
211 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
213 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
214 scan_notif->scanned_channels,
216 scan_notif->tsf_high, scan_notif->status);
219 /* The HW is no longer scanning */
220 clear_bit(STATUS_SCAN_HW, &priv->status);
222 IWL_DEBUG_INFO(priv, "Scan on %sGHz took %dms\n",
223 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
224 jiffies_to_msecs(elapsed_jiffies
225 (priv->scan_start, jiffies)));
228 * If a request to abort was given, or the scan did not succeed
229 * then we reset the scan state machine and terminate,
230 * re-queuing another scan if one has been requested
232 if (test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status))
233 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
235 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
237 clear_bit(STATUS_SCANNING, &priv->status);
239 queue_work(priv->workqueue, &priv->scan_completed);
242 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
245 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
246 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
247 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
248 iwl_rx_scan_results_notif;
249 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
250 iwl_rx_scan_complete_notif;
252 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
254 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
255 enum ieee80211_band band,
258 if (band == IEEE80211_BAND_5GHZ)
259 return IWL_ACTIVE_DWELL_TIME_52 +
260 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
262 return IWL_ACTIVE_DWELL_TIME_24 +
263 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
265 EXPORT_SYMBOL(iwl_get_active_dwell_time);
267 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
268 enum ieee80211_band band,
269 struct ieee80211_vif *vif)
271 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
272 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
273 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
275 if (iwl_is_associated(priv)) {
276 /* If we're associated, we clamp the maximum passive
277 * dwell time to be 98% of the beacon interval (minus
278 * 2 * channel tune time) */
279 passive = vif ? vif->bss_conf.beacon_int : 0;
280 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
281 passive = IWL_PASSIVE_DWELL_BASE;
282 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
287 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
289 void iwl_init_scan_params(struct iwl_priv *priv)
291 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
292 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
293 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
294 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
295 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
297 EXPORT_SYMBOL(iwl_init_scan_params);
299 static int iwl_scan_initiate(struct iwl_priv *priv, struct ieee80211_vif *vif)
301 WARN_ON(!mutex_is_locked(&priv->mutex));
303 IWL_DEBUG_INFO(priv, "Starting scan...\n");
304 set_bit(STATUS_SCANNING, &priv->status);
305 priv->is_internal_short_scan = false;
306 priv->scan_start = jiffies;
308 if (WARN_ON(!priv->cfg->ops->utils->request_scan))
311 priv->cfg->ops->utils->request_scan(priv, vif);
316 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
317 struct ieee80211_vif *vif,
318 struct cfg80211_scan_request *req)
320 struct iwl_priv *priv = hw->priv;
323 IWL_DEBUG_MAC80211(priv, "enter\n");
325 if (req->n_channels == 0)
328 mutex_lock(&priv->mutex);
330 if (!iwl_is_ready_rf(priv)) {
332 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
336 if (test_bit(STATUS_SCANNING, &priv->status)) {
337 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
342 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
343 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
348 /* mac80211 will only ask for one band at a time */
349 priv->scan_band = req->channels[0]->band;
350 priv->scan_request = req;
352 ret = iwl_scan_initiate(priv, vif);
354 IWL_DEBUG_MAC80211(priv, "leave\n");
357 mutex_unlock(&priv->mutex);
361 EXPORT_SYMBOL(iwl_mac_hw_scan);
364 * internal short scan, this function should only been called while associated.
365 * It will reset and tune the radio to prevent possible RF related problem
367 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
369 queue_work(priv->workqueue, &priv->start_internal_scan);
372 void iwl_bg_start_internal_scan(struct work_struct *work)
374 struct iwl_priv *priv =
375 container_of(work, struct iwl_priv, start_internal_scan);
377 mutex_lock(&priv->mutex);
379 if (priv->is_internal_short_scan == true) {
380 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
384 if (!iwl_is_ready_rf(priv)) {
385 IWL_DEBUG_SCAN(priv, "not ready or exit pending\n");
389 if (test_bit(STATUS_SCANNING, &priv->status)) {
390 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
394 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
395 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
399 priv->scan_band = priv->band;
401 IWL_DEBUG_SCAN(priv, "Start internal short scan...\n");
402 set_bit(STATUS_SCANNING, &priv->status);
403 priv->is_internal_short_scan = true;
405 if (WARN_ON(!priv->cfg->ops->utils->request_scan))
408 priv->cfg->ops->utils->request_scan(priv, NULL);
410 mutex_unlock(&priv->mutex);
412 EXPORT_SYMBOL(iwl_bg_start_internal_scan);
414 void iwl_bg_scan_check(struct work_struct *data)
416 struct iwl_priv *priv =
417 container_of(data, struct iwl_priv, scan_check.work);
419 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
422 mutex_lock(&priv->mutex);
423 if (test_bit(STATUS_SCANNING, &priv->status) ||
424 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
425 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
427 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
429 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
430 iwl_send_scan_abort(priv);
432 mutex_unlock(&priv->mutex);
434 EXPORT_SYMBOL(iwl_bg_scan_check);
437 * iwl_fill_probe_req - fill in all required fields and IE for probe request
440 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
441 const u8 *ta, const u8 *ies, int ie_len, int left)
446 /* Make sure there is enough space for the probe request,
447 * two mandatory IEs and the data */
452 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
453 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
454 memcpy(frame->sa, ta, ETH_ALEN);
455 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
461 pos = &frame->u.probe_req.variable[0];
463 /* fill in our indirect SSID IE */
467 *pos++ = WLAN_EID_SSID;
472 if (WARN_ON(left < ie_len))
476 memcpy(pos, ies, ie_len);
482 EXPORT_SYMBOL(iwl_fill_probe_req);
484 void iwl_bg_abort_scan(struct work_struct *work)
486 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
488 if (!test_bit(STATUS_READY, &priv->status) ||
489 !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
492 mutex_lock(&priv->mutex);
494 set_bit(STATUS_SCAN_ABORTING, &priv->status);
495 iwl_send_scan_abort(priv);
497 mutex_unlock(&priv->mutex);
499 EXPORT_SYMBOL(iwl_bg_abort_scan);
501 void iwl_bg_scan_completed(struct work_struct *work)
503 struct iwl_priv *priv =
504 container_of(work, struct iwl_priv, scan_completed);
505 bool internal = false;
507 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
509 cancel_delayed_work(&priv->scan_check);
511 mutex_lock(&priv->mutex);
512 if (priv->is_internal_short_scan) {
513 priv->is_internal_short_scan = false;
514 IWL_DEBUG_SCAN(priv, "internal short scan completed\n");
517 mutex_unlock(&priv->mutex);
520 * Do not hold mutex here since this will cause mac80211 to call
521 * into driver again into functions that will attempt to take
525 ieee80211_scan_completed(priv->hw, false);
527 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
530 /* Since setting the TXPOWER may have been deferred while
531 * performing the scan, fire one off */
532 mutex_lock(&priv->mutex);
533 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
534 mutex_unlock(&priv->mutex);
536 EXPORT_SYMBOL(iwl_bg_scan_completed);
538 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
540 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
541 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
542 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
543 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
545 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);