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/types.h>
29 #include <linux/etherdevice.h>
30 #include <net/mac80211.h>
32 #include "iwl-eeprom.h"
37 #include "iwl-helpers.h"
39 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
40 * sending probe req. This should be set long enough to hear probe responses
41 * from more than one AP. */
42 #define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
43 #define IWL_ACTIVE_DWELL_TIME_52 (20)
45 #define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
46 #define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
48 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
49 * Must be set longer than active dwell time.
50 * For the most reliable scan, set > AP beacon interval (typically 100msec). */
51 #define IWL_PASSIVE_DWELL_TIME_24 (20) /* all times in msec */
52 #define IWL_PASSIVE_DWELL_TIME_52 (10)
53 #define IWL_PASSIVE_DWELL_BASE (100)
54 #define IWL_CHANNEL_TUNE_TIME 5
59 * iwl_scan_cancel - Cancel any currently executing HW scan
61 * NOTE: priv->mutex is not required before calling this function
63 int iwl_scan_cancel(struct iwl_priv *priv)
65 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
66 clear_bit(STATUS_SCANNING, &priv->status);
70 if (test_bit(STATUS_SCANNING, &priv->status)) {
71 if (!test_and_set_bit(STATUS_SCAN_ABORTING, &priv->status)) {
72 IWL_DEBUG_SCAN(priv, "Queuing scan abort.\n");
73 queue_work(priv->workqueue, &priv->abort_scan);
76 IWL_DEBUG_SCAN(priv, "Scan abort already in progress.\n");
78 return test_bit(STATUS_SCANNING, &priv->status);
83 EXPORT_SYMBOL(iwl_scan_cancel);
85 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
86 * @ms: amount of time to wait (in milliseconds) for scan to abort
88 * NOTE: priv->mutex must be held before calling this function
90 int iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
92 unsigned long now = jiffies;
95 ret = iwl_scan_cancel(priv);
97 mutex_unlock(&priv->mutex);
98 while (!time_after(jiffies, now + msecs_to_jiffies(ms)) &&
99 test_bit(STATUS_SCANNING, &priv->status))
101 mutex_lock(&priv->mutex);
103 return test_bit(STATUS_SCANNING, &priv->status);
108 EXPORT_SYMBOL(iwl_scan_cancel_timeout);
110 static int iwl_send_scan_abort(struct iwl_priv *priv)
113 struct iwl_rx_packet *pkt;
114 struct iwl_host_cmd cmd = {
115 .id = REPLY_SCAN_ABORT_CMD,
116 .flags = CMD_WANT_SKB,
119 /* If there isn't a scan actively going on in the hardware
120 * then we are in between scan bands and not actually
121 * actively scanning, so don't send the abort command */
122 if (!test_bit(STATUS_SCAN_HW, &priv->status)) {
123 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
127 ret = iwl_send_cmd_sync(priv, &cmd);
129 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
133 pkt = (struct iwl_rx_packet *)cmd.reply_page;
134 if (pkt->u.status != CAN_ABORT_STATUS) {
135 /* The scan abort will return 1 for success or
136 * 2 for "failure". A failure condition can be
137 * due to simply not being in an active scan which
138 * can occur if we send the scan abort before we
139 * the microcode has notified us that a scan is
141 IWL_DEBUG_INFO(priv, "SCAN_ABORT returned %d.\n", pkt->u.status);
142 clear_bit(STATUS_SCAN_ABORTING, &priv->status);
143 clear_bit(STATUS_SCAN_HW, &priv->status);
146 iwl_free_pages(priv, cmd.reply_page);
151 /* Service response to REPLY_SCAN_CMD (0x80) */
152 static void iwl_rx_reply_scan(struct iwl_priv *priv,
153 struct iwl_rx_mem_buffer *rxb)
155 #ifdef CONFIG_IWLWIFI_DEBUG
156 struct iwl_rx_packet *pkt = rxb_addr(rxb);
157 struct iwl_scanreq_notification *notif =
158 (struct iwl_scanreq_notification *)pkt->u.raw;
160 IWL_DEBUG_RX(priv, "Scan request status = 0x%x\n", notif->status);
164 /* Service SCAN_START_NOTIFICATION (0x82) */
165 static void iwl_rx_scan_start_notif(struct iwl_priv *priv,
166 struct iwl_rx_mem_buffer *rxb)
168 struct iwl_rx_packet *pkt = rxb_addr(rxb);
169 struct iwl_scanstart_notification *notif =
170 (struct iwl_scanstart_notification *)pkt->u.raw;
171 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
172 IWL_DEBUG_SCAN(priv, "Scan start: "
174 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
176 notif->band ? "bg" : "a",
177 le32_to_cpu(notif->tsf_high),
178 le32_to_cpu(notif->tsf_low),
179 notif->status, notif->beacon_timer);
182 /* Service SCAN_RESULTS_NOTIFICATION (0x83) */
183 static void iwl_rx_scan_results_notif(struct iwl_priv *priv,
184 struct iwl_rx_mem_buffer *rxb)
186 #ifdef CONFIG_IWLWIFI_DEBUG
187 struct iwl_rx_packet *pkt = rxb_addr(rxb);
188 struct iwl_scanresults_notification *notif =
189 (struct iwl_scanresults_notification *)pkt->u.raw;
191 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
193 "(TSF: 0x%08X:%08X) - %d "
194 "elapsed=%lu usec\n",
196 notif->band ? "bg" : "a",
197 le32_to_cpu(notif->tsf_high),
198 le32_to_cpu(notif->tsf_low),
199 le32_to_cpu(notif->statistics[0]),
200 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
204 /* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
205 static void iwl_rx_scan_complete_notif(struct iwl_priv *priv,
206 struct iwl_rx_mem_buffer *rxb)
208 #ifdef CONFIG_IWLWIFI_DEBUG
209 struct iwl_rx_packet *pkt = rxb_addr(rxb);
210 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
212 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
213 scan_notif->scanned_channels,
215 scan_notif->tsf_high, scan_notif->status);
218 /* The HW is no longer scanning */
219 clear_bit(STATUS_SCAN_HW, &priv->status);
221 IWL_DEBUG_INFO(priv, "Scan on %sGHz took %dms\n",
222 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
223 jiffies_to_msecs(elapsed_jiffies
224 (priv->scan_start, jiffies)));
227 * If a request to abort was given, or the scan did not succeed
228 * then we reset the scan state machine and terminate,
229 * re-queuing another scan if one has been requested
231 if (test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->status))
232 IWL_DEBUG_INFO(priv, "Aborted scan completed.\n");
234 IWL_DEBUG_INFO(priv, "Setting scan to off\n");
236 clear_bit(STATUS_SCANNING, &priv->status);
238 queue_work(priv->workqueue, &priv->scan_completed);
241 void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
244 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
245 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
246 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
247 iwl_rx_scan_results_notif;
248 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
249 iwl_rx_scan_complete_notif;
251 EXPORT_SYMBOL(iwl_setup_rx_scan_handlers);
253 inline u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
254 enum ieee80211_band band,
257 if (band == IEEE80211_BAND_5GHZ)
258 return IWL_ACTIVE_DWELL_TIME_52 +
259 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
261 return IWL_ACTIVE_DWELL_TIME_24 +
262 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
264 EXPORT_SYMBOL(iwl_get_active_dwell_time);
266 u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
267 enum ieee80211_band band)
269 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
270 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
271 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
273 if (iwl_is_associated(priv)) {
274 /* If we're associated, we clamp the maximum passive
275 * dwell time to be 98% of the beacon interval (minus
276 * 2 * channel tune time) */
277 passive = priv->beacon_int;
278 if ((passive > IWL_PASSIVE_DWELL_BASE) || !passive)
279 passive = IWL_PASSIVE_DWELL_BASE;
280 passive = (passive * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
285 EXPORT_SYMBOL(iwl_get_passive_dwell_time);
287 void iwl_init_scan_params(struct iwl_priv *priv)
289 u8 ant_idx = fls(priv->hw_params.valid_tx_ant) - 1;
290 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
291 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
292 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
293 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
295 EXPORT_SYMBOL(iwl_init_scan_params);
297 static int iwl_scan_initiate(struct iwl_priv *priv)
299 WARN_ON(!mutex_is_locked(&priv->mutex));
301 IWL_DEBUG_INFO(priv, "Starting scan...\n");
302 set_bit(STATUS_SCANNING, &priv->status);
303 priv->is_internal_short_scan = false;
304 priv->scan_start = jiffies;
306 if (WARN_ON(!priv->cfg->ops->utils->request_scan))
309 priv->cfg->ops->utils->request_scan(priv);
314 int iwl_mac_hw_scan(struct ieee80211_hw *hw,
315 struct ieee80211_vif *vif,
316 struct cfg80211_scan_request *req)
318 struct iwl_priv *priv = hw->priv;
321 IWL_DEBUG_MAC80211(priv, "enter\n");
323 if (req->n_channels == 0)
326 mutex_lock(&priv->mutex);
328 if (!iwl_is_ready_rf(priv)) {
330 IWL_DEBUG_MAC80211(priv, "leave - not ready or exit pending\n");
334 if (test_bit(STATUS_SCANNING, &priv->status)) {
335 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
340 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
341 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
346 /* mac80211 will only ask for one band at a time */
347 priv->scan_band = req->channels[0]->band;
348 priv->scan_request = req;
350 ret = iwl_scan_initiate(priv);
352 IWL_DEBUG_MAC80211(priv, "leave\n");
355 mutex_unlock(&priv->mutex);
359 EXPORT_SYMBOL(iwl_mac_hw_scan);
362 * internal short scan, this function should only been called while associated.
363 * It will reset and tune the radio to prevent possible RF related problem
365 void iwl_internal_short_hw_scan(struct iwl_priv *priv)
367 queue_work(priv->workqueue, &priv->start_internal_scan);
370 static void iwl_bg_start_internal_scan(struct work_struct *work)
372 struct iwl_priv *priv =
373 container_of(work, struct iwl_priv, start_internal_scan);
375 mutex_lock(&priv->mutex);
377 if (!iwl_is_ready_rf(priv)) {
378 IWL_DEBUG_SCAN(priv, "not ready or exit pending\n");
382 if (test_bit(STATUS_SCANNING, &priv->status)) {
383 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
387 if (test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
388 IWL_DEBUG_SCAN(priv, "Scan request while abort pending\n");
392 priv->scan_band = priv->band;
394 IWL_DEBUG_SCAN(priv, "Start internal short scan...\n");
395 set_bit(STATUS_SCANNING, &priv->status);
396 priv->is_internal_short_scan = true;
398 if (WARN_ON(!priv->cfg->ops->utils->request_scan))
401 priv->cfg->ops->utils->request_scan(priv);
403 mutex_unlock(&priv->mutex);
406 void iwl_bg_scan_check(struct work_struct *data)
408 struct iwl_priv *priv =
409 container_of(data, struct iwl_priv, scan_check.work);
411 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
414 mutex_lock(&priv->mutex);
415 if (test_bit(STATUS_SCANNING, &priv->status) ||
416 test_bit(STATUS_SCAN_ABORTING, &priv->status)) {
417 IWL_DEBUG_SCAN(priv, "Scan completion watchdog resetting "
419 jiffies_to_msecs(IWL_SCAN_CHECK_WATCHDOG));
421 if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
422 iwl_send_scan_abort(priv);
424 mutex_unlock(&priv->mutex);
426 EXPORT_SYMBOL(iwl_bg_scan_check);
429 * iwl_fill_probe_req - fill in all required fields and IE for probe request
432 u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
433 const u8 *ies, int ie_len, int left)
438 /* Make sure there is enough space for the probe request,
439 * two mandatory IEs and the data */
444 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
445 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
446 memcpy(frame->sa, priv->mac_addr, ETH_ALEN);
447 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
453 pos = &frame->u.probe_req.variable[0];
455 /* fill in our indirect SSID IE */
459 *pos++ = WLAN_EID_SSID;
464 if (WARN_ON(left < ie_len))
468 memcpy(pos, ies, ie_len);
474 EXPORT_SYMBOL(iwl_fill_probe_req);
476 void iwl_bg_abort_scan(struct work_struct *work)
478 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
480 if (!test_bit(STATUS_READY, &priv->status) ||
481 !test_bit(STATUS_GEO_CONFIGURED, &priv->status))
484 mutex_lock(&priv->mutex);
486 set_bit(STATUS_SCAN_ABORTING, &priv->status);
487 iwl_send_scan_abort(priv);
489 mutex_unlock(&priv->mutex);
491 EXPORT_SYMBOL(iwl_bg_abort_scan);
493 void iwl_bg_scan_completed(struct work_struct *work)
495 struct iwl_priv *priv =
496 container_of(work, struct iwl_priv, scan_completed);
498 IWL_DEBUG_SCAN(priv, "SCAN complete scan\n");
500 cancel_delayed_work(&priv->scan_check);
502 if (!priv->is_internal_short_scan)
503 ieee80211_scan_completed(priv->hw, false);
505 priv->is_internal_short_scan = false;
506 IWL_DEBUG_SCAN(priv, "internal short scan completed\n");
509 if (test_bit(STATUS_EXIT_PENDING, &priv->status))
512 /* Since setting the TXPOWER may have been deferred while
513 * performing the scan, fire one off */
514 mutex_lock(&priv->mutex);
515 iwl_set_tx_power(priv, priv->tx_power_user_lmt, true);
516 mutex_unlock(&priv->mutex);
518 EXPORT_SYMBOL(iwl_bg_scan_completed);
520 void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
522 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
523 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
524 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
525 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
527 EXPORT_SYMBOL(iwl_setup_scan_deferred_work);