1 // SPDX-License-Identifier: GPL-2.0-only
3 * Scan implementation for ST-Ericsson CW1200 mac80211 drivers
5 * Copyright (c) 2010, ST-Ericsson
6 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
9 #include <linux/sched.h>
15 static void cw1200_scan_restart_delayed(struct cw1200_common *priv);
17 static int cw1200_scan_start(struct cw1200_common *priv, struct wsm_scan *scan)
22 switch (priv->join_status) {
23 case CW1200_JOIN_STATUS_PRE_STA:
24 case CW1200_JOIN_STATUS_JOINING:
30 wiphy_dbg(priv->hw->wiphy, "[SCAN] hw req, type %d, %d channels, flags: 0x%x.\n",
31 scan->type, scan->num_channels, scan->flags);
33 for (i = 0; i < scan->num_channels; ++i)
34 tmo += scan->ch[i].max_chan_time + 10;
36 cancel_delayed_work_sync(&priv->clear_recent_scan_work);
37 atomic_set(&priv->scan.in_progress, 1);
38 atomic_set(&priv->recent_scan, 1);
39 cw1200_pm_stay_awake(&priv->pm_state, msecs_to_jiffies(tmo));
40 queue_delayed_work(priv->workqueue, &priv->scan.timeout,
41 msecs_to_jiffies(tmo));
42 ret = wsm_scan(priv, scan);
44 atomic_set(&priv->scan.in_progress, 0);
45 cancel_delayed_work_sync(&priv->scan.timeout);
46 cw1200_scan_restart_delayed(priv);
51 int cw1200_hw_scan(struct ieee80211_hw *hw,
52 struct ieee80211_vif *vif,
53 struct ieee80211_scan_request *hw_req)
55 struct cw1200_common *priv = hw->priv;
56 struct cfg80211_scan_request *req = &hw_req->req;
57 struct wsm_template_frame frame = {
58 .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST,
65 /* Scan when P2P_GO corrupt firmware MiniAP mode */
66 if (priv->join_status == CW1200_JOIN_STATUS_AP)
69 if (req->n_ssids == 1 && !req->ssids[0].ssid_len)
72 wiphy_dbg(hw->wiphy, "[SCAN] Scan request for %d SSIDs.\n",
75 if (req->n_ssids > WSM_SCAN_MAX_NUM_OF_SSIDS)
78 /* will be unlocked in cw1200_scan_work() */
79 down(&priv->scan.lock);
80 mutex_lock(&priv->conf_mutex);
82 frame.skb = ieee80211_probereq_get(hw, priv->vif->addr, NULL, 0,
85 mutex_unlock(&priv->conf_mutex);
91 skb_put_data(frame.skb, req->ie, req->ie_len);
93 ret = wsm_set_template_frame(priv, &frame);
95 /* Host want to be the probe responder. */
96 ret = wsm_set_probe_responder(priv, true);
99 dev_kfree_skb(frame.skb);
100 mutex_unlock(&priv->conf_mutex);
101 up(&priv->scan.lock);
107 BUG_ON(priv->scan.req);
108 priv->scan.req = req;
109 priv->scan.n_ssids = 0;
110 priv->scan.status = 0;
111 priv->scan.begin = &req->channels[0];
112 priv->scan.curr = priv->scan.begin;
113 priv->scan.end = &req->channels[req->n_channels];
114 priv->scan.output_power = priv->output_power;
116 for (i = 0; i < req->n_ssids; ++i) {
117 struct wsm_ssid *dst = &priv->scan.ssids[priv->scan.n_ssids];
118 memcpy(&dst->ssid[0], req->ssids[i].ssid, sizeof(dst->ssid));
119 dst->length = req->ssids[i].ssid_len;
120 ++priv->scan.n_ssids;
124 dev_kfree_skb(frame.skb);
125 mutex_unlock(&priv->conf_mutex);
126 queue_work(priv->workqueue, &priv->scan.work);
130 void cw1200_scan_work(struct work_struct *work)
132 struct cw1200_common *priv = container_of(work, struct cw1200_common,
134 struct ieee80211_channel **it;
135 struct wsm_scan scan = {
136 .type = WSM_SCAN_TYPE_FOREGROUND,
137 .flags = WSM_SCAN_FLAG_SPLIT_METHOD,
139 bool first_run = (priv->scan.begin == priv->scan.curr &&
140 priv->scan.begin != priv->scan.end);
144 /* Firmware gets crazy if scan request is sent
145 * when STA is joined but not yet associated.
146 * Force unjoin in this case.
148 if (cancel_delayed_work_sync(&priv->join_timeout) > 0)
149 cw1200_join_timeout(&priv->join_timeout.work);
152 mutex_lock(&priv->conf_mutex);
155 if (priv->join_status == CW1200_JOIN_STATUS_STA &&
156 !(priv->powersave_mode.mode & WSM_PSM_PS)) {
157 struct wsm_set_pm pm = priv->powersave_mode;
158 pm.mode = WSM_PSM_PS;
159 cw1200_set_pm(priv, &pm);
160 } else if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) {
161 /* FW bug: driver has to restart p2p-dev mode
164 cw1200_disable_listening(priv);
168 if (!priv->scan.req || (priv->scan.curr == priv->scan.end)) {
169 struct cfg80211_scan_info info = {
170 .aborted = priv->scan.status ? 1 : 0,
173 if (priv->scan.output_power != priv->output_power)
174 wsm_set_output_power(priv, priv->output_power * 10);
175 if (priv->join_status == CW1200_JOIN_STATUS_STA &&
176 !(priv->powersave_mode.mode & WSM_PSM_PS))
177 cw1200_set_pm(priv, &priv->powersave_mode);
179 if (priv->scan.status < 0)
180 wiphy_warn(priv->hw->wiphy,
181 "[SCAN] Scan failed (%d).\n",
183 else if (priv->scan.req)
184 wiphy_dbg(priv->hw->wiphy,
185 "[SCAN] Scan completed.\n");
187 wiphy_dbg(priv->hw->wiphy,
188 "[SCAN] Scan canceled.\n");
190 priv->scan.req = NULL;
191 cw1200_scan_restart_delayed(priv);
193 mutex_unlock(&priv->conf_mutex);
194 ieee80211_scan_completed(priv->hw, &info);
195 up(&priv->scan.lock);
198 struct ieee80211_channel *first = *priv->scan.curr;
199 for (it = priv->scan.curr + 1, i = 1;
200 it != priv->scan.end && i < WSM_SCAN_MAX_NUM_OF_CHANNELS;
202 if ((*it)->band != first->band)
204 if (((*it)->flags ^ first->flags) &
205 IEEE80211_CHAN_NO_IR)
207 if (!(first->flags & IEEE80211_CHAN_NO_IR) &&
208 (*it)->max_power != first->max_power)
211 scan.band = first->band;
213 if (priv->scan.req->no_cck)
214 scan.max_tx_rate = WSM_TRANSMIT_RATE_6;
216 scan.max_tx_rate = WSM_TRANSMIT_RATE_1;
218 (first->flags & IEEE80211_CHAN_NO_IR) ? 0 : 2;
219 scan.num_ssids = priv->scan.n_ssids;
220 scan.ssids = &priv->scan.ssids[0];
221 scan.num_channels = it - priv->scan.curr;
222 /* TODO: Is it optimal? */
223 scan.probe_delay = 100;
224 /* It is not stated in WSM specification, however
225 * FW team says that driver may not use FG scan
228 if (priv->join_status == CW1200_JOIN_STATUS_STA) {
229 scan.type = WSM_SCAN_TYPE_BACKGROUND;
230 scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND;
232 scan.ch = kcalloc(it - priv->scan.curr,
233 sizeof(struct wsm_scan_ch),
236 priv->scan.status = -ENOMEM;
239 for (i = 0; i < scan.num_channels; ++i) {
240 scan.ch[i].number = priv->scan.curr[i]->hw_value;
241 if (priv->scan.curr[i]->flags & IEEE80211_CHAN_NO_IR) {
242 scan.ch[i].min_chan_time = 50;
243 scan.ch[i].max_chan_time = 100;
245 scan.ch[i].min_chan_time = 10;
246 scan.ch[i].max_chan_time = 25;
249 if (!(first->flags & IEEE80211_CHAN_NO_IR) &&
250 priv->scan.output_power != first->max_power) {
251 priv->scan.output_power = first->max_power;
252 wsm_set_output_power(priv,
253 priv->scan.output_power * 10);
255 priv->scan.status = cw1200_scan_start(priv, &scan);
257 if (priv->scan.status)
259 priv->scan.curr = it;
261 mutex_unlock(&priv->conf_mutex);
265 priv->scan.curr = priv->scan.end;
266 mutex_unlock(&priv->conf_mutex);
267 queue_work(priv->workqueue, &priv->scan.work);
271 static void cw1200_scan_restart_delayed(struct cw1200_common *priv)
273 /* FW bug: driver has to restart p2p-dev mode after scan. */
274 if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) {
275 cw1200_enable_listening(priv);
276 cw1200_update_filtering(priv);
279 if (priv->delayed_unjoin) {
280 priv->delayed_unjoin = false;
281 if (queue_work(priv->workqueue, &priv->unjoin_work) <= 0)
283 } else if (priv->delayed_link_loss) {
284 wiphy_dbg(priv->hw->wiphy, "[CQM] Requeue BSS loss.\n");
285 priv->delayed_link_loss = 0;
286 cw1200_cqm_bssloss_sm(priv, 1, 0, 0);
290 static void cw1200_scan_complete(struct cw1200_common *priv)
292 queue_delayed_work(priv->workqueue, &priv->clear_recent_scan_work, HZ);
293 if (priv->scan.direct_probe) {
294 wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe complete.\n");
295 cw1200_scan_restart_delayed(priv);
296 priv->scan.direct_probe = 0;
297 up(&priv->scan.lock);
300 cw1200_scan_work(&priv->scan.work);
304 void cw1200_scan_failed_cb(struct cw1200_common *priv)
306 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
307 /* STA is stopped. */
310 if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) {
311 priv->scan.status = -EIO;
312 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0);
317 void cw1200_scan_complete_cb(struct cw1200_common *priv,
318 struct wsm_scan_complete *arg)
320 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED)
321 /* STA is stopped. */
324 if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) {
325 priv->scan.status = 1;
326 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0);
330 void cw1200_clear_recent_scan_work(struct work_struct *work)
332 struct cw1200_common *priv =
333 container_of(work, struct cw1200_common,
334 clear_recent_scan_work.work);
335 atomic_xchg(&priv->recent_scan, 0);
338 void cw1200_scan_timeout(struct work_struct *work)
340 struct cw1200_common *priv =
341 container_of(work, struct cw1200_common, scan.timeout.work);
342 if (atomic_xchg(&priv->scan.in_progress, 0)) {
343 if (priv->scan.status > 0) {
344 priv->scan.status = 0;
345 } else if (!priv->scan.status) {
346 wiphy_warn(priv->hw->wiphy,
347 "Timeout waiting for scan complete notification.\n");
348 priv->scan.status = -ETIMEDOUT;
349 priv->scan.curr = priv->scan.end;
352 cw1200_scan_complete(priv);
356 void cw1200_probe_work(struct work_struct *work)
358 struct cw1200_common *priv =
359 container_of(work, struct cw1200_common, scan.probe_work.work);
360 u8 queue_id = cw1200_queue_get_queue_id(priv->pending_frame_id);
361 struct cw1200_queue *queue = &priv->tx_queue[queue_id];
362 const struct cw1200_txpriv *txpriv;
364 struct wsm_template_frame frame = {
365 .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST,
367 struct wsm_ssid ssids[1] = {{
370 struct wsm_scan_ch ch[1] = {{
374 struct wsm_scan scan = {
375 .type = WSM_SCAN_TYPE_FOREGROUND,
386 wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe work.\n");
388 mutex_lock(&priv->conf_mutex);
389 if (down_trylock(&priv->scan.lock)) {
390 /* Scan is already in progress. Requeue self. */
392 queue_delayed_work(priv->workqueue, &priv->scan.probe_work,
393 msecs_to_jiffies(100));
394 mutex_unlock(&priv->conf_mutex);
398 /* Make sure we still have a pending probe req */
399 if (cw1200_queue_get_skb(queue, priv->pending_frame_id,
400 &frame.skb, &txpriv)) {
401 up(&priv->scan.lock);
402 mutex_unlock(&priv->conf_mutex);
406 wsm = (struct wsm_tx *)frame.skb->data;
407 scan.max_tx_rate = wsm->max_tx_rate;
408 scan.band = (priv->channel->band == NL80211_BAND_5GHZ) ?
409 WSM_PHY_BAND_5G : WSM_PHY_BAND_2_4G;
410 if (priv->join_status == CW1200_JOIN_STATUS_STA ||
411 priv->join_status == CW1200_JOIN_STATUS_IBSS) {
412 scan.type = WSM_SCAN_TYPE_BACKGROUND;
413 scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND;
415 ch[0].number = priv->channel->hw_value;
417 skb_pull(frame.skb, txpriv->offset);
419 ies = &frame.skb->data[sizeof(struct ieee80211_hdr_3addr)];
420 ies_len = frame.skb->len - sizeof(struct ieee80211_hdr_3addr);
424 (u8 *)cfg80211_find_ie(WLAN_EID_SSID, ies, ies_len);
425 if (ssidie && ssidie[1] && ssidie[1] <= sizeof(ssids[0].ssid)) {
426 u8 *nextie = &ssidie[2 + ssidie[1]];
427 /* Remove SSID from the IE list. It has to be provided
428 * as a separate argument in cw1200_scan_start call
431 /* Store SSID localy */
432 ssids[0].length = ssidie[1];
433 memcpy(ssids[0].ssid, &ssidie[2], ssids[0].length);
436 /* Remove SSID from IE list */
438 memmove(&ssidie[2], nextie, &ies[ies_len] - nextie);
439 skb_trim(frame.skb, frame.skb->len - ssids[0].length);
443 /* FW bug: driver has to restart p2p-dev mode after scan */
444 if (priv->join_status == CW1200_JOIN_STATUS_MONITOR)
445 cw1200_disable_listening(priv);
446 ret = wsm_set_template_frame(priv, &frame);
447 priv->scan.direct_probe = 1;
450 ret = cw1200_scan_start(priv, &scan);
452 mutex_unlock(&priv->conf_mutex);
454 skb_push(frame.skb, txpriv->offset);
456 IEEE80211_SKB_CB(frame.skb)->flags |= IEEE80211_TX_STAT_ACK;
457 BUG_ON(cw1200_queue_remove(queue, priv->pending_frame_id));
460 priv->scan.direct_probe = 0;
461 up(&priv->scan.lock);