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Tomas Winkler2a421b92008-06-12 09:47:10 +08001/******************************************************************************
2 *
3 * GPL LICENSE SUMMARY
4 *
Wey-Yi Guy901069c2011-04-05 09:42:00 -07005 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
Tomas Winkler2a421b92008-06-12 09:47:10 +08006 *
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:
Winkler, Tomas759ef892008-12-09 11:28:58 -080025 * Intel Linux Wireless <ilw@linux.intel.com>
Tomas Winkler2a421b92008-06-12 09:47:10 +080026 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
27 *****************************************************************************/
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
John W. Linville7e272fc2008-09-24 18:13:14 -040029#include <linux/types.h>
Tomas Winkler2a421b92008-06-12 09:47:10 +080030#include <linux/etherdevice.h>
John W. Linville7e272fc2008-09-24 18:13:14 -040031#include <net/mac80211.h>
Tomas Winkler2a421b92008-06-12 09:47:10 +080032
33#include "iwl-eeprom.h"
34#include "iwl-dev.h"
35#include "iwl-core.h"
Tomas Winkler2a421b92008-06-12 09:47:10 +080036#include "iwl-io.h"
Wey-Yi Guye80d70e2011-06-03 07:54:15 -070037#include "iwl-agn.h"
Emmanuel Grumbachbdfbf092011-07-08 08:46:16 -070038#include "iwl-trans.h"
Tomas Winkler2a421b92008-06-12 09:47:10 +080039
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. */
Tomas Winklerfe905f12008-07-11 11:53:39 +080043#define IWL_ACTIVE_DWELL_TIME_24 (30) /* all times in msec */
44#define IWL_ACTIVE_DWELL_TIME_52 (20)
45
46#define IWL_ACTIVE_DWELL_FACTOR_24GHZ (3)
47#define IWL_ACTIVE_DWELL_FACTOR_52GHZ (2)
Tomas Winkler2a421b92008-06-12 09:47:10 +080048
Tomas Winkler2a421b92008-06-12 09:47:10 +080049/* 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
56
Stanislaw Gruszkacd446002010-09-13 14:46:36 +020057static int iwl_send_scan_abort(struct iwl_priv *priv)
58{
59 int ret;
60 struct iwl_rx_packet *pkt;
61 struct iwl_host_cmd cmd = {
62 .id = REPLY_SCAN_ABORT_CMD,
Emmanuel Grumbache419d622011-07-08 08:46:14 -070063 .flags = CMD_SYNC | CMD_WANT_SKB,
Stanislaw Gruszkacd446002010-09-13 14:46:36 +020064 };
Tomas Winklerfe905f12008-07-11 11:53:39 +080065
Stanislaw Gruszkacd446002010-09-13 14:46:36 +020066 /* Exit instantly with error when device is not ready
67 * to receive scan abort command or it does not perform
68 * hardware scan currently */
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -070069 if (!test_bit(STATUS_READY, &priv->shrd->status) ||
70 !test_bit(STATUS_GEO_CONFIGURED, &priv->shrd->status) ||
71 !test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
72 test_bit(STATUS_FW_ERROR, &priv->shrd->status) ||
73 test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
Stanislaw Gruszkacd446002010-09-13 14:46:36 +020074 return -EIO;
75
Emmanuel Grumbache6bb4c92011-08-25 23:10:48 -070076 ret = iwl_trans_send_cmd(trans(priv), &cmd);
Stanislaw Gruszkacd446002010-09-13 14:46:36 +020077 if (ret)
78 return ret;
79
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
87 * completed. */
Stanislaw Gruszka7cf24422010-09-13 14:46:44 +020088 IWL_DEBUG_SCAN(priv, "SCAN_ABORT ret %d.\n", pkt->u.status);
Stanislaw Gruszkacd446002010-09-13 14:46:36 +020089 ret = -EIO;
90 }
91
Emmanuel Grumbach790428b2011-08-25 23:11:05 -070092 iwl_free_pages(priv->shrd, cmd.reply_page);
Stanislaw Gruszkacd446002010-09-13 14:46:36 +020093 return ret;
94}
95
Stanislaw Gruszka02d8c142010-09-13 14:46:38 +020096static void iwl_complete_scan(struct iwl_priv *priv, bool aborted)
97{
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);
102 }
103
Johannes Bergc6baf7f2011-07-23 10:24:47 -0700104 if (priv->scan_type == IWL_SCAN_ROC) {
105 ieee80211_remain_on_channel_expired(priv->hw);
106 priv->hw_roc_channel = NULL;
107 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
108 }
109
Johannes Berg266af4c72011-03-10 20:13:26 -0800110 priv->scan_type = IWL_SCAN_NORMAL;
Stanislaw Gruszka02d8c142010-09-13 14:46:38 +0200111 priv->scan_vif = NULL;
112 priv->scan_request = NULL;
113}
114
Johannes Berga2fa2462011-09-22 15:14:59 -0700115static void iwl_process_scan_complete(struct iwl_priv *priv)
116{
117 bool aborted;
118
Johannes Berg84b1bec2011-09-22 15:15:00 -0700119 lockdep_assert_held(&priv->shrd->mutex);
120
121 if (!test_and_clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status))
122 return;
123
Johannes Berga2fa2462011-09-22 15:14:59 -0700124 IWL_DEBUG_SCAN(priv, "Completed scan.\n");
125
126 cancel_delayed_work(&priv->scan_check);
127
128 aborted = test_and_clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
129 if (aborted)
130 IWL_DEBUG_SCAN(priv, "Aborted scan completed.\n");
131
132 if (!test_and_clear_bit(STATUS_SCANNING, &priv->shrd->status)) {
133 IWL_DEBUG_SCAN(priv, "Scan already completed.\n");
134 goto out_settings;
135 }
136
137 if (priv->scan_type == IWL_SCAN_ROC) {
138 ieee80211_remain_on_channel_expired(priv->hw);
139 priv->hw_roc_channel = NULL;
140 schedule_delayed_work(&priv->hw_roc_disable_work, 10 * HZ);
141 }
142
143 if (priv->scan_type != IWL_SCAN_NORMAL && !aborted) {
144 int err;
145
146 /* Check if mac80211 requested scan during our internal scan */
147 if (priv->scan_request == NULL)
148 goto out_complete;
149
150 /* If so request a new scan */
151 err = iwl_scan_initiate(priv, priv->scan_vif, IWL_SCAN_NORMAL,
152 priv->scan_request->channels[0]->band);
153 if (err) {
154 IWL_DEBUG_SCAN(priv,
155 "failed to initiate pending scan: %d\n", err);
156 aborted = true;
157 goto out_complete;
158 }
159
160 return;
161 }
162
163out_complete:
164 iwl_complete_scan(priv, aborted);
165
166out_settings:
167 /* Can we still talk to firmware ? */
168 if (!iwl_is_ready_rf(priv->shrd))
169 return;
170
171 iwlagn_post_scan(priv);
172}
173
Stanislaw Gruszkae7e16b92010-09-13 14:46:41 +0200174void iwl_force_scan_end(struct iwl_priv *priv)
Stanislaw Gruszkaf5354c12010-09-13 14:46:39 +0200175{
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -0700176 lockdep_assert_held(&priv->shrd->mutex);
Stanislaw Gruszkae7e16b92010-09-13 14:46:41 +0200177
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -0700178 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
Stanislaw Gruszkae7e16b92010-09-13 14:46:41 +0200179 IWL_DEBUG_SCAN(priv, "Forcing scan end while not scanning\n");
180 return;
181 }
182
Stanislaw Gruszkaf5354c12010-09-13 14:46:39 +0200183 IWL_DEBUG_SCAN(priv, "Forcing scan end\n");
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -0700184 clear_bit(STATUS_SCANNING, &priv->shrd->status);
185 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
186 clear_bit(STATUS_SCAN_ABORTING, &priv->shrd->status);
Johannes Berg84b1bec2011-09-22 15:15:00 -0700187 clear_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
Stanislaw Gruszkaf5354c12010-09-13 14:46:39 +0200188 iwl_complete_scan(priv, true);
189}
190
Stanislaw Gruszkacd446002010-09-13 14:46:36 +0200191static void iwl_do_scan_abort(struct iwl_priv *priv)
192{
193 int ret;
194
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -0700195 lockdep_assert_held(&priv->shrd->mutex);
Stanislaw Gruszkacd446002010-09-13 14:46:36 +0200196
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -0700197 if (!test_bit(STATUS_SCANNING, &priv->shrd->status)) {
Stanislaw Gruszkacd446002010-09-13 14:46:36 +0200198 IWL_DEBUG_SCAN(priv, "Not performing scan to abort\n");
199 return;
200 }
201
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -0700202 if (test_and_set_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
Stanislaw Gruszkacd446002010-09-13 14:46:36 +0200203 IWL_DEBUG_SCAN(priv, "Scan abort in progress\n");
204 return;
205 }
206
207 ret = iwl_send_scan_abort(priv);
208 if (ret) {
209 IWL_DEBUG_SCAN(priv, "Send scan abort failed %d\n", ret);
Stanislaw Gruszkaf5354c12010-09-13 14:46:39 +0200210 iwl_force_scan_end(priv);
Stanislaw Gruszkacd446002010-09-13 14:46:36 +0200211 } else
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300212 IWL_DEBUG_SCAN(priv, "Successfully send scan abort\n");
Stanislaw Gruszkacd446002010-09-13 14:46:36 +0200213}
Tomas Winklerfe905f12008-07-11 11:53:39 +0800214
Tomas Winkler2a421b92008-06-12 09:47:10 +0800215/**
216 * iwl_scan_cancel - Cancel any currently executing HW scan
Tomas Winkler2a421b92008-06-12 09:47:10 +0800217 */
218int iwl_scan_cancel(struct iwl_priv *priv)
219{
Stanislaw Gruszkacd446002010-09-13 14:46:36 +0200220 IWL_DEBUG_SCAN(priv, "Queuing abort scan\n");
Emmanuel Grumbach74e28e42011-08-25 23:10:41 -0700221 queue_work(priv->shrd->workqueue, &priv->abort_scan);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800222 return 0;
223}
Stanislaw Gruszkacd446002010-09-13 14:46:36 +0200224
Tomas Winkler2a421b92008-06-12 09:47:10 +0800225/**
226 * iwl_scan_cancel_timeout - Cancel any currently executing HW scan
227 * @ms: amount of time to wait (in milliseconds) for scan to abort
228 *
Tomas Winkler2a421b92008-06-12 09:47:10 +0800229 */
Johannes Berg98efb4a2011-09-22 15:14:57 -0700230void iwl_scan_cancel_timeout(struct iwl_priv *priv, unsigned long ms)
Tomas Winkler2a421b92008-06-12 09:47:10 +0800231{
Stanislaw Gruszkae693a802010-09-13 14:46:37 +0200232 unsigned long timeout = jiffies + msecs_to_jiffies(ms);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800233
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -0700234 lockdep_assert_held(&priv->shrd->mutex);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800235
Stanislaw Gruszkae693a802010-09-13 14:46:37 +0200236 IWL_DEBUG_SCAN(priv, "Scan cancel timeout\n");
237
238 iwl_do_scan_abort(priv);
239
240 while (time_before_eq(jiffies, timeout)) {
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -0700241 if (!test_bit(STATUS_SCAN_HW, &priv->shrd->status))
Johannes Berg84b1bec2011-09-22 15:15:00 -0700242 goto finished;
Stanislaw Gruszkae693a802010-09-13 14:46:37 +0200243 msleep(20);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800244 }
Johannes Berg84b1bec2011-09-22 15:15:00 -0700245
246 return;
247
248 finished:
249 /*
250 * Now STATUS_SCAN_HW is clear. This means that the
251 * device finished, but the background work is going
252 * to execute at best as soon as we release the mutex.
253 * Since we need to be able to issue a new scan right
254 * after this function returns, run the complete here.
255 * The STATUS_SCAN_COMPLETE bit will then be cleared
256 * and prevent the background work from "completing"
257 * a possible new scan.
258 */
259 iwl_process_scan_complete(priv);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800260}
Tomas Winkler2a421b92008-06-12 09:47:10 +0800261
Tomas Winkler2a421b92008-06-12 09:47:10 +0800262/* Service response to REPLY_SCAN_CMD (0x80) */
Emmanuel Grumbach247c61d2011-09-20 15:37:23 -0700263static int iwl_rx_reply_scan(struct iwl_priv *priv,
264 struct iwl_rx_mem_buffer *rxb,
265 struct iwl_device_cmd *cmd)
Tomas Winkler2a421b92008-06-12 09:47:10 +0800266{
267#ifdef CONFIG_IWLWIFI_DEBUG
Zhu Yi2f301222009-10-09 17:19:45 +0800268 struct iwl_rx_packet *pkt = rxb_addr(rxb);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800269 struct iwl_scanreq_notification *notif =
270 (struct iwl_scanreq_notification *)pkt->u.raw;
271
Stanislaw Gruszka7cf24422010-09-13 14:46:44 +0200272 IWL_DEBUG_SCAN(priv, "Scan request status = 0x%x\n", notif->status);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800273#endif
Emmanuel Grumbach247c61d2011-09-20 15:37:23 -0700274 return 0;
Tomas Winkler2a421b92008-06-12 09:47:10 +0800275}
276
277/* Service SCAN_START_NOTIFICATION (0x82) */
Emmanuel Grumbach247c61d2011-09-20 15:37:23 -0700278static int iwl_rx_scan_start_notif(struct iwl_priv *priv,
279 struct iwl_rx_mem_buffer *rxb,
280 struct iwl_device_cmd *cmd)
Tomas Winkler2a421b92008-06-12 09:47:10 +0800281{
Zhu Yi2f301222009-10-09 17:19:45 +0800282 struct iwl_rx_packet *pkt = rxb_addr(rxb);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800283 struct iwl_scanstart_notification *notif =
284 (struct iwl_scanstart_notification *)pkt->u.raw;
285 priv->scan_start_tsf = le32_to_cpu(notif->tsf_low);
Tomas Winklere1623442009-01-27 14:27:56 -0800286 IWL_DEBUG_SCAN(priv, "Scan start: "
Tomas Winkler2a421b92008-06-12 09:47:10 +0800287 "%d [802.11%s] "
288 "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n",
289 notif->channel,
290 notif->band ? "bg" : "a",
Tomas Winklerfe905f12008-07-11 11:53:39 +0800291 le32_to_cpu(notif->tsf_high),
292 le32_to_cpu(notif->tsf_low),
293 notif->status, notif->beacon_timer);
Johannes Bergc6baf7f2011-07-23 10:24:47 -0700294
Johannes Berg390808d2011-09-20 15:37:22 -0700295 if (priv->scan_type == IWL_SCAN_ROC &&
296 !priv->hw_roc_start_notified) {
Johannes Bergc6baf7f2011-07-23 10:24:47 -0700297 ieee80211_ready_on_channel(priv->hw);
Johannes Berg390808d2011-09-20 15:37:22 -0700298 priv->hw_roc_start_notified = true;
299 }
Emmanuel Grumbach247c61d2011-09-20 15:37:23 -0700300
301 return 0;
Tomas Winkler2a421b92008-06-12 09:47:10 +0800302}
303
304/* Service SCAN_RESULTS_NOTIFICATION (0x83) */
Emmanuel Grumbach247c61d2011-09-20 15:37:23 -0700305static int iwl_rx_scan_results_notif(struct iwl_priv *priv,
306 struct iwl_rx_mem_buffer *rxb,
307 struct iwl_device_cmd *cmd)
Tomas Winkler2a421b92008-06-12 09:47:10 +0800308{
309#ifdef CONFIG_IWLWIFI_DEBUG
Zhu Yi2f301222009-10-09 17:19:45 +0800310 struct iwl_rx_packet *pkt = rxb_addr(rxb);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800311 struct iwl_scanresults_notification *notif =
312 (struct iwl_scanresults_notification *)pkt->u.raw;
313
Tomas Winklere1623442009-01-27 14:27:56 -0800314 IWL_DEBUG_SCAN(priv, "Scan ch.res: "
Tomas Winkler2a421b92008-06-12 09:47:10 +0800315 "%d [802.11%s] "
Wey-Yi Guy1895b362011-09-22 15:14:51 -0700316 "probe status: %u:%u "
Tomas Winkler2a421b92008-06-12 09:47:10 +0800317 "(TSF: 0x%08X:%08X) - %d "
Henry Zhangh220575f2010-01-22 14:22:44 -0800318 "elapsed=%lu usec\n",
Tomas Winkler2a421b92008-06-12 09:47:10 +0800319 notif->channel,
320 notif->band ? "bg" : "a",
Wey-Yi Guy1895b362011-09-22 15:14:51 -0700321 notif->probe_status, notif->num_probe_not_sent,
Tomas Winkler2a421b92008-06-12 09:47:10 +0800322 le32_to_cpu(notif->tsf_high),
323 le32_to_cpu(notif->tsf_low),
324 le32_to_cpu(notif->statistics[0]),
Henry Zhangh220575f2010-01-22 14:22:44 -0800325 le32_to_cpu(notif->tsf_low) - priv->scan_start_tsf);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800326#endif
Emmanuel Grumbach247c61d2011-09-20 15:37:23 -0700327 return 0;
Tomas Winkler2a421b92008-06-12 09:47:10 +0800328}
329
330/* Service SCAN_COMPLETE_NOTIFICATION (0x84) */
Emmanuel Grumbach247c61d2011-09-20 15:37:23 -0700331static int iwl_rx_scan_complete_notif(struct iwl_priv *priv,
332 struct iwl_rx_mem_buffer *rxb,
333 struct iwl_device_cmd *cmd)
Tomas Winkler2a421b92008-06-12 09:47:10 +0800334{
Zhu Yi2f301222009-10-09 17:19:45 +0800335 struct iwl_rx_packet *pkt = rxb_addr(rxb);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800336 struct iwl_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
337
Tomas Winklere1623442009-01-27 14:27:56 -0800338 IWL_DEBUG_SCAN(priv, "Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
Tomas Winkler2a421b92008-06-12 09:47:10 +0800339 scan_notif->scanned_channels,
340 scan_notif->tsf_low,
341 scan_notif->tsf_high, scan_notif->status);
342
Stanislaw Gruszka7cf24422010-09-13 14:46:44 +0200343 IWL_DEBUG_SCAN(priv, "Scan on %sGHz took %dms\n",
Johannes Berg00700ee2010-04-06 04:12:37 -0700344 (priv->scan_band == IEEE80211_BAND_2GHZ) ? "2.4" : "5.2",
Stanislaw Gruszkaef1b21f2010-11-12 08:47:07 +0100345 jiffies_to_msecs(jiffies - priv->scan_start));
Tomas Winkler2a421b92008-06-12 09:47:10 +0800346
Johannes Berg84b1bec2011-09-22 15:15:00 -0700347 /*
348 * When aborting, we run the scan completed background work inline
349 * and the background work must then do nothing. The SCAN_COMPLETE
350 * bit helps implement that logic and thus needs to be set before
351 * queueing the work. Also, since the scan abort waits for SCAN_HW
352 * to clear, we need to set SCAN_COMPLETE before clearing SCAN_HW
353 * to avoid a race there.
354 */
355 set_bit(STATUS_SCAN_COMPLETE, &priv->shrd->status);
356 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
Emmanuel Grumbach74e28e42011-08-25 23:10:41 -0700357 queue_work(priv->shrd->workqueue, &priv->scan_completed);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800358
Wey-Yi Guyf78e5452010-08-23 07:57:15 -0700359 if (priv->iw_mode != NL80211_IFTYPE_ADHOC &&
Stanislaw Gruszka88e58fc2011-01-28 16:47:47 +0100360 iwl_advanced_bt_coexist(priv) &&
Johannes Bergd5926d92010-09-13 14:46:34 +0200361 priv->bt_status != scan_notif->bt_status) {
Wey-Yi Guyf78e5452010-08-23 07:57:15 -0700362 if (scan_notif->bt_status) {
363 /* BT on */
364 if (!priv->bt_ch_announce)
365 priv->bt_traffic_load =
366 IWL_BT_COEX_TRAFFIC_LOAD_HIGH;
367 /*
368 * otherwise, no traffic load information provided
369 * no changes made
370 */
371 } else {
372 /* BT off */
373 priv->bt_traffic_load =
374 IWL_BT_COEX_TRAFFIC_LOAD_NONE;
375 }
376 priv->bt_status = scan_notif->bt_status;
Emmanuel Grumbach74e28e42011-08-25 23:10:41 -0700377 queue_work(priv->shrd->workqueue,
378 &priv->bt_traffic_change_work);
Wey-Yi Guyf78e5452010-08-23 07:57:15 -0700379 }
Emmanuel Grumbach247c61d2011-09-20 15:37:23 -0700380 return 0;
Tomas Winkler2a421b92008-06-12 09:47:10 +0800381}
382
383void iwl_setup_rx_scan_handlers(struct iwl_priv *priv)
384{
385 /* scan handlers */
386 priv->rx_handlers[REPLY_SCAN_CMD] = iwl_rx_reply_scan;
387 priv->rx_handlers[SCAN_START_NOTIFICATION] = iwl_rx_scan_start_notif;
388 priv->rx_handlers[SCAN_RESULTS_NOTIFICATION] =
389 iwl_rx_scan_results_notif;
390 priv->rx_handlers[SCAN_COMPLETE_NOTIFICATION] =
391 iwl_rx_scan_complete_notif;
392}
Tomas Winkler2a421b92008-06-12 09:47:10 +0800393
Johannes Berg6e809a12011-09-20 15:37:20 -0700394static u16 iwl_get_active_dwell_time(struct iwl_priv *priv,
395 enum ieee80211_band band, u8 n_probes)
Tomas Winkler2a421b92008-06-12 09:47:10 +0800396{
397 if (band == IEEE80211_BAND_5GHZ)
Tomas Winklerfe905f12008-07-11 11:53:39 +0800398 return IWL_ACTIVE_DWELL_TIME_52 +
399 IWL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800400 else
Tomas Winklerfe905f12008-07-11 11:53:39 +0800401 return IWL_ACTIVE_DWELL_TIME_24 +
402 IWL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800403}
404
Johannes Berg390808d2011-09-20 15:37:22 -0700405static u16 iwl_limit_dwell(struct iwl_priv *priv, u16 dwell_time)
406{
407 struct iwl_rxon_context *ctx;
408
409 /*
410 * If we're associated, we clamp the dwell time 98%
411 * of the smallest beacon interval (minus 2 * channel
412 * tune time)
413 */
414 for_each_context(priv, ctx) {
415 u16 value;
416
417 if (!iwl_is_associated_ctx(ctx))
418 continue;
419 value = ctx->beacon_int;
420 if (!value)
421 value = IWL_PASSIVE_DWELL_BASE;
422 value = (value * 98) / 100 - IWL_CHANNEL_TUNE_TIME * 2;
423 dwell_time = min(value, dwell_time);
424 }
425
426 return dwell_time;
427}
428
Johannes Berg6e809a12011-09-20 15:37:20 -0700429static u16 iwl_get_passive_dwell_time(struct iwl_priv *priv,
430 enum ieee80211_band band)
Tomas Winkler2a421b92008-06-12 09:47:10 +0800431{
Tomas Winklerfe905f12008-07-11 11:53:39 +0800432 u16 passive = (band == IEEE80211_BAND_2GHZ) ?
Tomas Winkler2a421b92008-06-12 09:47:10 +0800433 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_24 :
434 IWL_PASSIVE_DWELL_BASE + IWL_PASSIVE_DWELL_TIME_52;
435
Johannes Berg390808d2011-09-20 15:37:22 -0700436 return iwl_limit_dwell(priv, passive);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800437}
438
Johannes Berg6e809a12011-09-20 15:37:20 -0700439static int iwl_get_single_channel_for_scan(struct iwl_priv *priv,
440 struct ieee80211_vif *vif,
441 enum ieee80211_band band,
442 struct iwl_scan_channel *scan_ch)
443{
444 const struct ieee80211_supported_band *sband;
445 u16 passive_dwell = 0;
446 u16 active_dwell = 0;
447 int added = 0;
448 u16 channel = 0;
449
450 sband = iwl_get_hw_mode(priv, band);
451 if (!sband) {
452 IWL_ERR(priv, "invalid band\n");
453 return added;
454 }
455
456 active_dwell = iwl_get_active_dwell_time(priv, band, 0);
457 passive_dwell = iwl_get_passive_dwell_time(priv, band);
458
459 if (passive_dwell <= active_dwell)
460 passive_dwell = active_dwell + 1;
461
462 channel = iwl_get_single_channel_number(priv, band);
463 if (channel) {
464 scan_ch->channel = cpu_to_le16(channel);
465 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
466 scan_ch->active_dwell = cpu_to_le16(active_dwell);
467 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
468 /* Set txpower levels to defaults */
469 scan_ch->dsp_atten = 110;
470 if (band == IEEE80211_BAND_5GHZ)
471 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
472 else
473 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
474 added++;
475 } else
476 IWL_ERR(priv, "no valid channel found\n");
477 return added;
478}
479
480static int iwl_get_channels_for_scan(struct iwl_priv *priv,
481 struct ieee80211_vif *vif,
482 enum ieee80211_band band,
483 u8 is_active, u8 n_probes,
484 struct iwl_scan_channel *scan_ch)
485{
486 struct ieee80211_channel *chan;
487 const struct ieee80211_supported_band *sband;
488 const struct iwl_channel_info *ch_info;
489 u16 passive_dwell = 0;
490 u16 active_dwell = 0;
491 int added, i;
492 u16 channel;
493
494 sband = iwl_get_hw_mode(priv, band);
495 if (!sband)
496 return 0;
497
498 active_dwell = iwl_get_active_dwell_time(priv, band, n_probes);
499 passive_dwell = iwl_get_passive_dwell_time(priv, band);
500
501 if (passive_dwell <= active_dwell)
502 passive_dwell = active_dwell + 1;
503
504 for (i = 0, added = 0; i < priv->scan_request->n_channels; i++) {
505 chan = priv->scan_request->channels[i];
506
507 if (chan->band != band)
508 continue;
509
510 channel = chan->hw_value;
511 scan_ch->channel = cpu_to_le16(channel);
512
513 ch_info = iwl_get_channel_info(priv, band, channel);
514 if (!is_channel_valid(ch_info)) {
515 IWL_DEBUG_SCAN(priv,
516 "Channel %d is INVALID for this band.\n",
517 channel);
518 continue;
519 }
520
521 if (!is_active || is_channel_passive(ch_info) ||
522 (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN))
523 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
524 else
525 scan_ch->type = SCAN_CHANNEL_TYPE_ACTIVE;
526
527 if (n_probes)
528 scan_ch->type |= IWL_SCAN_PROBE_MASK(n_probes);
529
530 scan_ch->active_dwell = cpu_to_le16(active_dwell);
531 scan_ch->passive_dwell = cpu_to_le16(passive_dwell);
532
533 /* Set txpower levels to defaults */
534 scan_ch->dsp_atten = 110;
535
536 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
537 * power level:
538 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
539 */
540 if (band == IEEE80211_BAND_5GHZ)
541 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
542 else
543 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
544
545 IWL_DEBUG_SCAN(priv, "Scanning ch=%d prob=0x%X [%s %d]\n",
546 channel, le32_to_cpu(scan_ch->type),
547 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
548 "ACTIVE" : "PASSIVE",
549 (scan_ch->type & SCAN_CHANNEL_TYPE_ACTIVE) ?
550 active_dwell : passive_dwell);
551
552 scan_ch++;
553 added++;
554 }
555
556 IWL_DEBUG_SCAN(priv, "total channels to scan %d\n", added);
557 return added;
558}
559
560static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
561{
562 struct iwl_host_cmd cmd = {
563 .id = REPLY_SCAN_CMD,
564 .len = { sizeof(struct iwl_scan_cmd), },
565 .flags = CMD_SYNC,
566 };
567 struct iwl_scan_cmd *scan;
568 struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
569 u32 rate_flags = 0;
570 u16 cmd_len;
571 u16 rx_chain = 0;
572 enum ieee80211_band band;
573 u8 n_probes = 0;
574 u8 rx_ant = hw_params(priv).valid_rx_ant;
575 u8 rate;
576 bool is_active = false;
577 int chan_mod;
578 u8 active_chains;
579 u8 scan_tx_antennas = hw_params(priv).valid_tx_ant;
580 int ret;
581
582 lockdep_assert_held(&priv->shrd->mutex);
583
584 if (vif)
585 ctx = iwl_rxon_ctx_from_vif(vif);
586
587 if (!priv->scan_cmd) {
588 priv->scan_cmd = kmalloc(sizeof(struct iwl_scan_cmd) +
589 IWL_MAX_SCAN_SIZE, GFP_KERNEL);
590 if (!priv->scan_cmd) {
591 IWL_DEBUG_SCAN(priv,
592 "fail to allocate memory for scan\n");
593 return -ENOMEM;
594 }
595 }
596 scan = priv->scan_cmd;
597 memset(scan, 0, sizeof(struct iwl_scan_cmd) + IWL_MAX_SCAN_SIZE);
598
599 scan->quiet_plcp_th = IWL_PLCP_QUIET_THRESH;
600 scan->quiet_time = IWL_ACTIVE_QUIET_TIME;
601
602 if (priv->scan_type != IWL_SCAN_ROC &&
603 iwl_is_any_associated(priv)) {
604 u16 interval = 0;
605 u32 extra;
606 u32 suspend_time = 100;
607 u32 scan_suspend_time = 100;
608
609 IWL_DEBUG_INFO(priv, "Scanning while associated...\n");
610 switch (priv->scan_type) {
611 case IWL_SCAN_ROC:
612 WARN_ON(1);
613 break;
614 case IWL_SCAN_RADIO_RESET:
615 interval = 0;
616 break;
617 case IWL_SCAN_NORMAL:
618 interval = vif->bss_conf.beacon_int;
619 break;
620 }
621
622 scan->suspend_time = 0;
623 scan->max_out_time = cpu_to_le32(200 * 1024);
624 if (!interval)
625 interval = suspend_time;
626
627 extra = (suspend_time / interval) << 22;
628 scan_suspend_time = (extra |
629 ((suspend_time % interval) * 1024));
630 scan->suspend_time = cpu_to_le32(scan_suspend_time);
631 IWL_DEBUG_SCAN(priv, "suspend_time 0x%X beacon interval %d\n",
632 scan_suspend_time, interval);
633 } else if (priv->scan_type == IWL_SCAN_ROC) {
634 scan->suspend_time = 0;
635 scan->max_out_time = 0;
636 scan->quiet_time = 0;
637 scan->quiet_plcp_th = 0;
638 }
639
640 switch (priv->scan_type) {
641 case IWL_SCAN_RADIO_RESET:
642 IWL_DEBUG_SCAN(priv, "Start internal passive scan.\n");
643 break;
644 case IWL_SCAN_NORMAL:
645 if (priv->scan_request->n_ssids) {
646 int i, p = 0;
647 IWL_DEBUG_SCAN(priv, "Kicking off active scan\n");
648 for (i = 0; i < priv->scan_request->n_ssids; i++) {
649 /* always does wildcard anyway */
650 if (!priv->scan_request->ssids[i].ssid_len)
651 continue;
652 scan->direct_scan[p].id = WLAN_EID_SSID;
653 scan->direct_scan[p].len =
654 priv->scan_request->ssids[i].ssid_len;
655 memcpy(scan->direct_scan[p].ssid,
656 priv->scan_request->ssids[i].ssid,
657 priv->scan_request->ssids[i].ssid_len);
658 n_probes++;
659 p++;
660 }
661 is_active = true;
662 } else
663 IWL_DEBUG_SCAN(priv, "Start passive scan.\n");
664 break;
665 case IWL_SCAN_ROC:
666 IWL_DEBUG_SCAN(priv, "Start ROC scan.\n");
667 break;
668 }
669
670 scan->tx_cmd.tx_flags = TX_CMD_FLG_SEQ_CTL_MSK;
671 scan->tx_cmd.sta_id = ctx->bcast_sta_id;
672 scan->tx_cmd.stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
673
674 switch (priv->scan_band) {
675 case IEEE80211_BAND_2GHZ:
676 scan->flags = RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK;
677 chan_mod = le32_to_cpu(
678 priv->contexts[IWL_RXON_CTX_BSS].active.flags &
679 RXON_FLG_CHANNEL_MODE_MSK)
680 >> RXON_FLG_CHANNEL_MODE_POS;
Johannes Berg3a8aea02011-10-14 12:54:48 -0700681 if ((priv->scan_request && priv->scan_request->no_cck) ||
682 chan_mod == CHANNEL_MODE_PURE_40) {
Johannes Berg6e809a12011-09-20 15:37:20 -0700683 rate = IWL_RATE_6M_PLCP;
684 } else {
685 rate = IWL_RATE_1M_PLCP;
686 rate_flags = RATE_MCS_CCK_MSK;
687 }
688 /*
689 * Internal scans are passive, so we can indiscriminately set
690 * the BT ignore flag on 2.4 GHz since it applies to TX only.
691 */
692 if (priv->cfg->bt_params &&
693 priv->cfg->bt_params->advanced_bt_coexist)
694 scan->tx_cmd.tx_flags |= TX_CMD_FLG_IGNORE_BT;
695 break;
696 case IEEE80211_BAND_5GHZ:
697 rate = IWL_RATE_6M_PLCP;
698 break;
699 default:
700 IWL_WARN(priv, "Invalid scan band\n");
701 return -EIO;
702 }
703
704 /*
705 * If active scanning is requested but a certain channel is
706 * marked passive, we can do active scanning if we detect
707 * transmissions.
708 *
709 * There is an issue with some firmware versions that triggers
710 * a sysassert on a "good CRC threshold" of zero (== disabled),
711 * on a radar channel even though this means that we should NOT
712 * send probes.
713 *
714 * The "good CRC threshold" is the number of frames that we
715 * need to receive during our dwell time on a channel before
716 * sending out probes -- setting this to a huge value will
717 * mean we never reach it, but at the same time work around
718 * the aforementioned issue. Thus use IWL_GOOD_CRC_TH_NEVER
719 * here instead of IWL_GOOD_CRC_TH_DISABLED.
720 *
721 * This was fixed in later versions along with some other
722 * scan changes, and the threshold behaves as a flag in those
723 * versions.
724 */
725 if (priv->new_scan_threshold_behaviour)
726 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
727 IWL_GOOD_CRC_TH_DISABLED;
728 else
729 scan->good_CRC_th = is_active ? IWL_GOOD_CRC_TH_DEFAULT :
730 IWL_GOOD_CRC_TH_NEVER;
731
732 band = priv->scan_band;
733
734 if (priv->cfg->scan_rx_antennas[band])
735 rx_ant = priv->cfg->scan_rx_antennas[band];
736
737 if (band == IEEE80211_BAND_2GHZ &&
738 priv->cfg->bt_params &&
739 priv->cfg->bt_params->advanced_bt_coexist) {
740 /* transmit 2.4 GHz probes only on first antenna */
741 scan_tx_antennas = first_antenna(scan_tx_antennas);
742 }
743
744 priv->scan_tx_ant[band] = iwl_toggle_tx_ant(priv,
745 priv->scan_tx_ant[band],
746 scan_tx_antennas);
747 rate_flags |= iwl_ant_idx_to_flags(priv->scan_tx_ant[band]);
748 scan->tx_cmd.rate_n_flags = iwl_hw_set_rate_n_flags(rate, rate_flags);
749
750 /* In power save mode use one chain, otherwise use all chains */
751 if (test_bit(STATUS_POWER_PMI, &priv->shrd->status)) {
752 /* rx_ant has been set to all valid chains previously */
753 active_chains = rx_ant &
754 ((u8)(priv->chain_noise_data.active_chains));
755 if (!active_chains)
756 active_chains = rx_ant;
757
758 IWL_DEBUG_SCAN(priv, "chain_noise_data.active_chains: %u\n",
759 priv->chain_noise_data.active_chains);
760
761 rx_ant = first_antenna(active_chains);
762 }
763 if (priv->cfg->bt_params &&
764 priv->cfg->bt_params->advanced_bt_coexist &&
765 priv->bt_full_concurrent) {
766 /* operated as 1x1 in full concurrency mode */
767 rx_ant = first_antenna(rx_ant);
768 }
769
770 /* MIMO is not used here, but value is required */
771 rx_chain |=
772 hw_params(priv).valid_rx_ant << RXON_RX_CHAIN_VALID_POS;
773 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_MIMO_SEL_POS;
774 rx_chain |= rx_ant << RXON_RX_CHAIN_FORCE_SEL_POS;
775 rx_chain |= 0x1 << RXON_RX_CHAIN_DRIVER_FORCE_POS;
776 scan->rx_chain = cpu_to_le16(rx_chain);
777 switch (priv->scan_type) {
778 case IWL_SCAN_NORMAL:
779 cmd_len = iwl_fill_probe_req(priv,
780 (struct ieee80211_mgmt *)scan->data,
781 vif->addr,
782 priv->scan_request->ie,
783 priv->scan_request->ie_len,
784 IWL_MAX_SCAN_SIZE - sizeof(*scan));
785 break;
786 case IWL_SCAN_RADIO_RESET:
787 case IWL_SCAN_ROC:
788 /* use bcast addr, will not be transmitted but must be valid */
789 cmd_len = iwl_fill_probe_req(priv,
790 (struct ieee80211_mgmt *)scan->data,
791 iwl_bcast_addr, NULL, 0,
792 IWL_MAX_SCAN_SIZE - sizeof(*scan));
793 break;
794 default:
795 BUG();
796 }
797 scan->tx_cmd.len = cpu_to_le16(cmd_len);
798
799 scan->filter_flags |= (RXON_FILTER_ACCEPT_GRP_MSK |
800 RXON_FILTER_BCON_AWARE_MSK);
801
802 switch (priv->scan_type) {
803 case IWL_SCAN_RADIO_RESET:
804 scan->channel_count =
805 iwl_get_single_channel_for_scan(priv, vif, band,
806 (void *)&scan->data[cmd_len]);
807 break;
808 case IWL_SCAN_NORMAL:
809 scan->channel_count =
810 iwl_get_channels_for_scan(priv, vif, band,
811 is_active, n_probes,
812 (void *)&scan->data[cmd_len]);
813 break;
814 case IWL_SCAN_ROC: {
815 struct iwl_scan_channel *scan_ch;
Johannes Berg390808d2011-09-20 15:37:22 -0700816 int n_chan, i;
817 u16 dwell;
Johannes Berg6e809a12011-09-20 15:37:20 -0700818
Johannes Berg390808d2011-09-20 15:37:22 -0700819 dwell = iwl_limit_dwell(priv, priv->hw_roc_duration);
820 n_chan = DIV_ROUND_UP(priv->hw_roc_duration, dwell);
821
822 scan->channel_count = n_chan;
Johannes Berg6e809a12011-09-20 15:37:20 -0700823
824 scan_ch = (void *)&scan->data[cmd_len];
Johannes Berg6e809a12011-09-20 15:37:20 -0700825
Johannes Berg390808d2011-09-20 15:37:22 -0700826 for (i = 0; i < n_chan; i++) {
827 scan_ch->type = SCAN_CHANNEL_TYPE_PASSIVE;
828 scan_ch->channel =
829 cpu_to_le16(priv->hw_roc_channel->hw_value);
Johannes Berg6e809a12011-09-20 15:37:20 -0700830
Johannes Berg390808d2011-09-20 15:37:22 -0700831 if (i == n_chan - 1)
832 dwell = priv->hw_roc_duration - i * dwell;
833
834 scan_ch->active_dwell =
835 scan_ch->passive_dwell = cpu_to_le16(dwell);
836
837 /* Set txpower levels to defaults */
838 scan_ch->dsp_atten = 110;
839
840 /* NOTE: if we were doing 6Mb OFDM for scans we'd use
841 * power level:
842 * scan_ch->tx_gain = ((1 << 5) | (2 << 3)) | 3;
843 */
844 if (priv->hw_roc_channel->band == IEEE80211_BAND_5GHZ)
845 scan_ch->tx_gain = ((1 << 5) | (3 << 3)) | 3;
846 else
847 scan_ch->tx_gain = ((1 << 5) | (5 << 3));
848
849 scan_ch++;
Johannes Berg6e809a12011-09-20 15:37:20 -0700850 }
Johannes Berg390808d2011-09-20 15:37:22 -0700851 }
852
Johannes Berg6e809a12011-09-20 15:37:20 -0700853 break;
854 }
855
856 if (scan->channel_count == 0) {
857 IWL_DEBUG_SCAN(priv, "channel count %d\n", scan->channel_count);
858 return -EIO;
859 }
860
861 cmd.len[0] += le16_to_cpu(scan->tx_cmd.len) +
862 scan->channel_count * sizeof(struct iwl_scan_channel);
863 cmd.data[0] = scan;
864 cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;
865 scan->len = cpu_to_le16(cmd.len[0]);
866
867 /* set scan bit here for PAN params */
868 set_bit(STATUS_SCAN_HW, &priv->shrd->status);
869
870 ret = iwlagn_set_pan_params(priv);
871 if (ret)
872 return ret;
873
874 ret = iwl_trans_send_cmd(trans(priv), &cmd);
875 if (ret) {
876 clear_bit(STATUS_SCAN_HW, &priv->shrd->status);
877 iwlagn_set_pan_params(priv);
878 }
879
880 return ret;
881}
882
Tomas Winklerf53696d2008-06-12 09:47:12 +0800883void iwl_init_scan_params(struct iwl_priv *priv)
884{
Emmanuel Grumbachd6189122011-08-25 23:10:39 -0700885 u8 ant_idx = fls(hw_params(priv).valid_tx_ant) - 1;
Tomas Winklerf53696d2008-06-12 09:47:12 +0800886 if (!priv->scan_tx_ant[IEEE80211_BAND_5GHZ])
Tomas Winkler76eff182008-10-14 12:32:45 -0700887 priv->scan_tx_ant[IEEE80211_BAND_5GHZ] = ant_idx;
Tomas Winklerf53696d2008-06-12 09:47:12 +0800888 if (!priv->scan_tx_ant[IEEE80211_BAND_2GHZ])
Tomas Winkler76eff182008-10-14 12:32:45 -0700889 priv->scan_tx_ant[IEEE80211_BAND_2GHZ] = ant_idx;
Tomas Winklerf53696d2008-06-12 09:47:12 +0800890}
891
Johannes Berg266af4c72011-03-10 20:13:26 -0800892int __must_check iwl_scan_initiate(struct iwl_priv *priv,
893 struct ieee80211_vif *vif,
894 enum iwl_scan_type scan_type,
895 enum ieee80211_band band)
Tomas Winkler2a421b92008-06-12 09:47:10 +0800896{
Johannes Berg3eecce52010-09-13 14:46:33 +0200897 int ret;
Johannes Berg88be0262010-04-07 00:21:36 -0700898
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -0700899 lockdep_assert_held(&priv->shrd->mutex);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800900
Johannes Berg3eecce52010-09-13 14:46:33 +0200901 cancel_delayed_work(&priv->scan_check);
902
Emmanuel Grumbach845a9c02011-08-25 23:11:04 -0700903 if (!iwl_is_ready_rf(priv->shrd)) {
Stanislaw Gruszka7cf24422010-09-13 14:46:44 +0200904 IWL_WARN(priv, "Request scan called when driver not ready.\n");
Johannes Berg3eecce52010-09-13 14:46:33 +0200905 return -EIO;
906 }
907
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -0700908 if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
Stanislaw Gruszka7cf24422010-09-13 14:46:44 +0200909 IWL_DEBUG_SCAN(priv,
Johannes Berg3eecce52010-09-13 14:46:33 +0200910 "Multiple concurrent scan requests in parallel.\n");
911 return -EBUSY;
912 }
913
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -0700914 if (test_bit(STATUS_SCAN_ABORTING, &priv->shrd->status)) {
Stanislaw Gruszka7cf24422010-09-13 14:46:44 +0200915 IWL_DEBUG_SCAN(priv, "Scan request while abort pending.\n");
Johannes Berg3eecce52010-09-13 14:46:33 +0200916 return -EBUSY;
917 }
918
Stanislaw Gruszka7cf24422010-09-13 14:46:44 +0200919 IWL_DEBUG_SCAN(priv, "Starting %sscan...\n",
Johannes Berg266af4c72011-03-10 20:13:26 -0800920 scan_type == IWL_SCAN_NORMAL ? "" :
Johannes Bergc6baf7f2011-07-23 10:24:47 -0700921 scan_type == IWL_SCAN_ROC ? "remain-on-channel " :
Johannes Berg266af4c72011-03-10 20:13:26 -0800922 "internal short ");
Johannes Berg3eecce52010-09-13 14:46:33 +0200923
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -0700924 set_bit(STATUS_SCANNING, &priv->shrd->status);
Johannes Berg266af4c72011-03-10 20:13:26 -0800925 priv->scan_type = scan_type;
Johannes Berg3eecce52010-09-13 14:46:33 +0200926 priv->scan_start = jiffies;
927 priv->scan_band = band;
928
Don Fry5c3d29f2011-07-08 08:46:29 -0700929 ret = iwlagn_request_scan(priv, vif);
Johannes Berg3eecce52010-09-13 14:46:33 +0200930 if (ret) {
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -0700931 clear_bit(STATUS_SCANNING, &priv->shrd->status);
Johannes Berg266af4c72011-03-10 20:13:26 -0800932 priv->scan_type = IWL_SCAN_NORMAL;
Johannes Berg3eecce52010-09-13 14:46:33 +0200933 return ret;
934 }
935
Emmanuel Grumbach74e28e42011-08-25 23:10:41 -0700936 queue_delayed_work(priv->shrd->workqueue, &priv->scan_check,
Johannes Berg3eecce52010-09-13 14:46:33 +0200937 IWL_SCAN_CHECK_WATCHDOG);
Tomas Winkler2a421b92008-06-12 09:47:10 +0800938
939 return 0;
940}
Tomas Winkler2a421b92008-06-12 09:47:10 +0800941
Wey-Yi Guyade4c642011-10-10 07:27:11 -0700942int iwlagn_mac_hw_scan(struct ieee80211_hw *hw,
Johannes Berga060bbf2010-04-27 11:59:34 +0200943 struct ieee80211_vif *vif,
944 struct cfg80211_scan_request *req)
Abhijeet Kolekare9dde6f62009-02-18 15:54:27 -0800945{
Abhijeet Kolekare9dde6f62009-02-18 15:54:27 -0800946 struct iwl_priv *priv = hw->priv;
Johannes Berg00700ee2010-04-06 04:12:37 -0700947 int ret;
Abhijeet Kolekare9dde6f62009-02-18 15:54:27 -0800948
949 IWL_DEBUG_MAC80211(priv, "enter\n");
950
Johannes Berg00700ee2010-04-06 04:12:37 -0700951 if (req->n_channels == 0)
952 return -EINVAL;
953
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -0700954 mutex_lock(&priv->shrd->mutex);
Abhijeet Kolekare9dde6f62009-02-18 15:54:27 -0800955
Johannes Bergf84b29e2010-05-18 02:29:13 -0700956 /*
957 * If an internal scan is in progress, just set
958 * up the scan_request as per above.
959 */
Johannes Berg266af4c72011-03-10 20:13:26 -0800960 if (priv->scan_type != IWL_SCAN_NORMAL) {
Johannes Berg8bd2c1e2011-09-22 15:14:54 -0700961 IWL_DEBUG_SCAN(priv,
962 "SCAN request during internal scan - defer\n");
963 priv->scan_request = req;
964 priv->scan_vif = vif;
Johannes Bergf84b29e2010-05-18 02:29:13 -0700965 ret = 0;
Johannes Berg8bd2c1e2011-09-22 15:14:54 -0700966 } else {
967 priv->scan_request = req;
968 priv->scan_vif = vif;
969 /*
970 * mac80211 will only ask for one band at a time
971 * so using channels[0] here is ok
972 */
Johannes Berg266af4c72011-03-10 20:13:26 -0800973 ret = iwl_scan_initiate(priv, vif, IWL_SCAN_NORMAL,
Johannes Berg3eecce52010-09-13 14:46:33 +0200974 req->channels[0]->band);
Johannes Berg8bd2c1e2011-09-22 15:14:54 -0700975 if (ret) {
976 priv->scan_request = NULL;
977 priv->scan_vif = NULL;
978 }
979 }
Abhijeet Kolekare9dde6f62009-02-18 15:54:27 -0800980
981 IWL_DEBUG_MAC80211(priv, "leave\n");
982
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -0700983 mutex_unlock(&priv->shrd->mutex);
Abhijeet Kolekare9dde6f62009-02-18 15:54:27 -0800984
985 return ret;
986}
Abhijeet Kolekare9dde6f62009-02-18 15:54:27 -0800987
Wey-Yi Guyafbdd692010-01-22 14:22:43 -0800988/*
989 * internal short scan, this function should only been called while associated.
990 * It will reset and tune the radio to prevent possible RF related problem
991 */
Johannes Berg88be0262010-04-07 00:21:36 -0700992void iwl_internal_short_hw_scan(struct iwl_priv *priv)
Wey-Yi Guyafbdd692010-01-22 14:22:43 -0800993{
Emmanuel Grumbach74e28e42011-08-25 23:10:41 -0700994 queue_work(priv->shrd->workqueue, &priv->start_internal_scan);
Johannes Berg88be0262010-04-07 00:21:36 -0700995}
996
Stanislaw Gruszkac2408792010-07-30 16:41:08 +0200997static void iwl_bg_start_internal_scan(struct work_struct *work)
Johannes Berg88be0262010-04-07 00:21:36 -0700998{
999 struct iwl_priv *priv =
1000 container_of(work, struct iwl_priv, start_internal_scan);
1001
Stanislaw Gruszka7cf24422010-09-13 14:46:44 +02001002 IWL_DEBUG_SCAN(priv, "Start internal scan\n");
1003
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -07001004 mutex_lock(&priv->shrd->mutex);
Wey-Yi Guyafbdd692010-01-22 14:22:43 -08001005
Johannes Berg266af4c72011-03-10 20:13:26 -08001006 if (priv->scan_type == IWL_SCAN_RADIO_RESET) {
Reinette Chatre073d5ea2010-05-13 14:49:44 -07001007 IWL_DEBUG_SCAN(priv, "Internal scan already in progress\n");
1008 goto unlock;
1009 }
1010
Emmanuel Grumbach63013ae2011-08-25 23:10:42 -07001011 if (test_bit(STATUS_SCANNING, &priv->shrd->status)) {
Wey-Yi Guyafbdd692010-01-22 14:22:43 -08001012 IWL_DEBUG_SCAN(priv, "Scan already in progress.\n");
Johannes Berg88be0262010-04-07 00:21:36 -07001013 goto unlock;
Wey-Yi Guyafbdd692010-01-22 14:22:43 -08001014 }
Johannes Berg88be0262010-04-07 00:21:36 -07001015
Johannes Berg266af4c72011-03-10 20:13:26 -08001016 if (iwl_scan_initiate(priv, NULL, IWL_SCAN_RADIO_RESET, priv->band))
Johannes Berg3eecce52010-09-13 14:46:33 +02001017 IWL_DEBUG_SCAN(priv, "failed to start internal short scan\n");
Johannes Berg88be0262010-04-07 00:21:36 -07001018 unlock:
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -07001019 mutex_unlock(&priv->shrd->mutex);
Wey-Yi Guyafbdd692010-01-22 14:22:43 -08001020}
Wey-Yi Guyafbdd692010-01-22 14:22:43 -08001021
Stanislaw Gruszkac2408792010-07-30 16:41:08 +02001022static void iwl_bg_scan_check(struct work_struct *data)
Tomas Winkler2a421b92008-06-12 09:47:10 +08001023{
1024 struct iwl_priv *priv =
1025 container_of(data, struct iwl_priv, scan_check.work);
1026
Stanislaw Gruszka7cf24422010-09-13 14:46:44 +02001027 IWL_DEBUG_SCAN(priv, "Scan check work\n");
1028
Stanislaw Gruszkae7e16b92010-09-13 14:46:41 +02001029 /* Since we are here firmware does not finish scan and
1030 * most likely is in bad shape, so we don't bother to
1031 * send abort command, just force scan complete to mac80211 */
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -07001032 mutex_lock(&priv->shrd->mutex);
Stanislaw Gruszkae7e16b92010-09-13 14:46:41 +02001033 iwl_force_scan_end(priv);
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -07001034 mutex_unlock(&priv->shrd->mutex);
Tomas Winkler2a421b92008-06-12 09:47:10 +08001035}
Samuel Ortiz77fecfb82009-01-23 13:45:12 -08001036
Tomas Winkler2a421b92008-06-12 09:47:10 +08001037/**
Tomas Winkler2a421b92008-06-12 09:47:10 +08001038 * iwl_fill_probe_req - fill in all required fields and IE for probe request
1039 */
Tomas Winklerf53696d2008-06-12 09:47:12 +08001040
Johannes Berg1ecf9fc2009-04-20 14:36:56 -07001041u16 iwl_fill_probe_req(struct iwl_priv *priv, struct ieee80211_mgmt *frame,
Johannes Berg3a0b9aa2010-05-12 03:33:12 -07001042 const u8 *ta, const u8 *ies, int ie_len, int left)
Tomas Winkler2a421b92008-06-12 09:47:10 +08001043{
1044 int len = 0;
1045 u8 *pos = NULL;
Tomas Winklerf53696d2008-06-12 09:47:12 +08001046
Tomas Winkler2a421b92008-06-12 09:47:10 +08001047 /* Make sure there is enough space for the probe request,
1048 * two mandatory IEs and the data */
1049 left -= 24;
1050 if (left < 0)
1051 return 0;
Tomas Winkler2a421b92008-06-12 09:47:10 +08001052
1053 frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
1054 memcpy(frame->da, iwl_bcast_addr, ETH_ALEN);
Johannes Berg3a0b9aa2010-05-12 03:33:12 -07001055 memcpy(frame->sa, ta, ETH_ALEN);
Tomas Winkler2a421b92008-06-12 09:47:10 +08001056 memcpy(frame->bssid, iwl_bcast_addr, ETH_ALEN);
1057 frame->seq_ctrl = 0;
1058
Tomas Winklerf53696d2008-06-12 09:47:12 +08001059 len += 24;
Tomas Winkler2a421b92008-06-12 09:47:10 +08001060
Tomas Winklerf53696d2008-06-12 09:47:12 +08001061 /* ...next IE... */
1062 pos = &frame->u.probe_req.variable[0];
1063
1064 /* fill in our indirect SSID IE */
Tomas Winkler2a421b92008-06-12 09:47:10 +08001065 left -= 2;
1066 if (left < 0)
1067 return 0;
Tomas Winkler2a421b92008-06-12 09:47:10 +08001068 *pos++ = WLAN_EID_SSID;
Reinette Chatre1382c712010-02-25 10:02:19 -08001069 *pos++ = 0;
Tomas Winkler2a421b92008-06-12 09:47:10 +08001070
Reinette Chatre1382c712010-02-25 10:02:19 -08001071 len += 2;
Tomas Winkler2a421b92008-06-12 09:47:10 +08001072
Johannes Berg1ecf9fc2009-04-20 14:36:56 -07001073 if (WARN_ON(left < ie_len))
1074 return len;
Tomas Winkler2a421b92008-06-12 09:47:10 +08001075
Stanislaw Gruszkaeb2ec0f2010-04-16 15:46:41 +02001076 if (ies && ie_len) {
Wey-Yi Guyafbdd692010-01-22 14:22:43 -08001077 memcpy(pos, ies, ie_len);
Stanislaw Gruszkaeb2ec0f2010-04-16 15:46:41 +02001078 len += ie_len;
1079 }
Tomas Winklerf53696d2008-06-12 09:47:12 +08001080
Tomas Winkler2a421b92008-06-12 09:47:10 +08001081 return (u16)len;
1082}
1083
Stanislaw Gruszkac2408792010-07-30 16:41:08 +02001084static void iwl_bg_abort_scan(struct work_struct *work)
Tomas Winkler2a421b92008-06-12 09:47:10 +08001085{
1086 struct iwl_priv *priv = container_of(work, struct iwl_priv, abort_scan);
1087
Stanislaw Gruszka7cf24422010-09-13 14:46:44 +02001088 IWL_DEBUG_SCAN(priv, "Abort scan work\n");
1089
Stanislaw Gruszkae7e16b92010-09-13 14:46:41 +02001090 /* We keep scan_check work queued in case when firmware will not
1091 * report back scan completed notification */
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -07001092 mutex_lock(&priv->shrd->mutex);
Stanislaw Gruszka6bd17582010-09-13 14:46:40 +02001093 iwl_scan_cancel_timeout(priv, 200);
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -07001094 mutex_unlock(&priv->shrd->mutex);
Tomas Winkler2a421b92008-06-12 09:47:10 +08001095}
1096
Johannes Bergf2532472011-09-22 15:14:58 -07001097static void iwl_bg_scan_completed(struct work_struct *work)
1098{
1099 struct iwl_priv *priv =
1100 container_of(work, struct iwl_priv, scan_completed);
1101
1102 mutex_lock(&priv->shrd->mutex);
1103 iwl_process_scan_complete(priv);
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -07001104 mutex_unlock(&priv->shrd->mutex);
Tomas Winklereedda362008-10-06 16:05:32 +08001105}
Tomas Winklereedda362008-10-06 16:05:32 +08001106
Tomas Winkler2a421b92008-06-12 09:47:10 +08001107void iwl_setup_scan_deferred_work(struct iwl_priv *priv)
1108{
Tomas Winklereedda362008-10-06 16:05:32 +08001109 INIT_WORK(&priv->scan_completed, iwl_bg_scan_completed);
Tomas Winkler2a421b92008-06-12 09:47:10 +08001110 INIT_WORK(&priv->abort_scan, iwl_bg_abort_scan);
Johannes Berg88be0262010-04-07 00:21:36 -07001111 INIT_WORK(&priv->start_internal_scan, iwl_bg_start_internal_scan);
Tomas Winkler2a421b92008-06-12 09:47:10 +08001112 INIT_DELAYED_WORK(&priv->scan_check, iwl_bg_scan_check);
1113}
Tomas Winkler2a421b92008-06-12 09:47:10 +08001114
Stanislaw Gruszkae7e16b92010-09-13 14:46:41 +02001115void iwl_cancel_scan_deferred_work(struct iwl_priv *priv)
1116{
1117 cancel_work_sync(&priv->start_internal_scan);
1118 cancel_work_sync(&priv->abort_scan);
1119 cancel_work_sync(&priv->scan_completed);
1120
1121 if (cancel_delayed_work_sync(&priv->scan_check)) {
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -07001122 mutex_lock(&priv->shrd->mutex);
Stanislaw Gruszkae7e16b92010-09-13 14:46:41 +02001123 iwl_force_scan_end(priv);
Emmanuel Grumbach6ac2f832011-08-25 23:10:44 -07001124 mutex_unlock(&priv->shrd->mutex);
Stanislaw Gruszkae7e16b92010-09-13 14:46:41 +02001125 }
1126}