1 /* 2 * Scan implementation for ST-Ericsson CW1200 mac80211 drivers 3 * 4 * Copyright (c) 2010, ST-Ericsson 5 * Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11 12 #include <linux/sched.h> 13 #include "cw1200.h" 14 #include "scan.h" 15 #include "sta.h" 16 #include "pm.h" 17 18 static void cw1200_scan_restart_delayed(struct cw1200_common *priv); 19 20 static int cw1200_scan_start(struct cw1200_common *priv, struct wsm_scan *scan) 21 { 22 int ret, i; 23 int tmo = 2000; 24 25 switch (priv->join_status) { 26 case CW1200_JOIN_STATUS_PRE_STA: 27 case CW1200_JOIN_STATUS_JOINING: 28 return -EBUSY; 29 default: 30 break; 31 } 32 33 wiphy_dbg(priv->hw->wiphy, "[SCAN] hw req, type %d, %d channels, flags: 0x%x.\n", 34 scan->type, scan->num_channels, scan->flags); 35 36 for (i = 0; i < scan->num_channels; ++i) 37 tmo += scan->ch[i].max_chan_time + 10; 38 39 cancel_delayed_work_sync(&priv->clear_recent_scan_work); 40 atomic_set(&priv->scan.in_progress, 1); 41 atomic_set(&priv->recent_scan, 1); 42 cw1200_pm_stay_awake(&priv->pm_state, msecs_to_jiffies(tmo)); 43 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 44 msecs_to_jiffies(tmo)); 45 ret = wsm_scan(priv, scan); 46 if (ret) { 47 atomic_set(&priv->scan.in_progress, 0); 48 cancel_delayed_work_sync(&priv->scan.timeout); 49 cw1200_scan_restart_delayed(priv); 50 } 51 return ret; 52 } 53 54 int cw1200_hw_scan(struct ieee80211_hw *hw, 55 struct ieee80211_vif *vif, 56 struct ieee80211_scan_request *hw_req) 57 { 58 struct cw1200_common *priv = hw->priv; 59 struct cfg80211_scan_request *req = &hw_req->req; 60 struct wsm_template_frame frame = { 61 .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST, 62 }; 63 int i, ret; 64 65 if (!priv->vif) 66 return -EINVAL; 67 68 /* Scan when P2P_GO corrupt firmware MiniAP mode */ 69 if (priv->join_status == CW1200_JOIN_STATUS_AP) 70 return -EOPNOTSUPP; 71 72 if (req->n_ssids == 1 && !req->ssids[0].ssid_len) 73 req->n_ssids = 0; 74 75 wiphy_dbg(hw->wiphy, "[SCAN] Scan request for %d SSIDs.\n", 76 req->n_ssids); 77 78 if (req->n_ssids > WSM_SCAN_MAX_NUM_OF_SSIDS) 79 return -EINVAL; 80 81 frame.skb = ieee80211_probereq_get(hw, priv->vif->addr, NULL, 0, 82 req->ie_len); 83 if (!frame.skb) 84 return -ENOMEM; 85 86 if (req->ie_len) 87 memcpy(skb_put(frame.skb, req->ie_len), req->ie, req->ie_len); 88 89 /* will be unlocked in cw1200_scan_work() */ 90 down(&priv->scan.lock); 91 mutex_lock(&priv->conf_mutex); 92 93 ret = wsm_set_template_frame(priv, &frame); 94 if (!ret) { 95 /* Host want to be the probe responder. */ 96 ret = wsm_set_probe_responder(priv, true); 97 } 98 if (ret) { 99 mutex_unlock(&priv->conf_mutex); 100 up(&priv->scan.lock); 101 dev_kfree_skb(frame.skb); 102 return ret; 103 } 104 105 wsm_lock_tx(priv); 106 107 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; 115 116 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; 121 } 122 123 mutex_unlock(&priv->conf_mutex); 124 125 if (frame.skb) 126 dev_kfree_skb(frame.skb); 127 queue_work(priv->workqueue, &priv->scan.work); 128 return 0; 129 } 130 131 void cw1200_scan_work(struct work_struct *work) 132 { 133 struct cw1200_common *priv = container_of(work, struct cw1200_common, 134 scan.work); 135 struct ieee80211_channel **it; 136 struct wsm_scan scan = { 137 .type = WSM_SCAN_TYPE_FOREGROUND, 138 .flags = WSM_SCAN_FLAG_SPLIT_METHOD, 139 }; 140 bool first_run = (priv->scan.begin == priv->scan.curr && 141 priv->scan.begin != priv->scan.end); 142 int i; 143 144 if (first_run) { 145 /* Firmware gets crazy if scan request is sent 146 * when STA is joined but not yet associated. 147 * Force unjoin in this case. 148 */ 149 if (cancel_delayed_work_sync(&priv->join_timeout) > 0) 150 cw1200_join_timeout(&priv->join_timeout.work); 151 } 152 153 mutex_lock(&priv->conf_mutex); 154 155 if (first_run) { 156 if (priv->join_status == CW1200_JOIN_STATUS_STA && 157 !(priv->powersave_mode.mode & WSM_PSM_PS)) { 158 struct wsm_set_pm pm = priv->powersave_mode; 159 pm.mode = WSM_PSM_PS; 160 cw1200_set_pm(priv, &pm); 161 } else if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) { 162 /* FW bug: driver has to restart p2p-dev mode 163 * after scan 164 */ 165 cw1200_disable_listening(priv); 166 } 167 } 168 169 if (!priv->scan.req || (priv->scan.curr == priv->scan.end)) { 170 struct cfg80211_scan_info info = { 171 .aborted = priv->scan.status ? 1 : 0, 172 }; 173 174 if (priv->scan.output_power != priv->output_power) 175 wsm_set_output_power(priv, priv->output_power * 10); 176 if (priv->join_status == CW1200_JOIN_STATUS_STA && 177 !(priv->powersave_mode.mode & WSM_PSM_PS)) 178 cw1200_set_pm(priv, &priv->powersave_mode); 179 180 if (priv->scan.status < 0) 181 wiphy_warn(priv->hw->wiphy, 182 "[SCAN] Scan failed (%d).\n", 183 priv->scan.status); 184 else if (priv->scan.req) 185 wiphy_dbg(priv->hw->wiphy, 186 "[SCAN] Scan completed.\n"); 187 else 188 wiphy_dbg(priv->hw->wiphy, 189 "[SCAN] Scan canceled.\n"); 190 191 priv->scan.req = NULL; 192 cw1200_scan_restart_delayed(priv); 193 wsm_unlock_tx(priv); 194 mutex_unlock(&priv->conf_mutex); 195 ieee80211_scan_completed(priv->hw, &info); 196 up(&priv->scan.lock); 197 return; 198 } else { 199 struct ieee80211_channel *first = *priv->scan.curr; 200 for (it = priv->scan.curr + 1, i = 1; 201 it != priv->scan.end && i < WSM_SCAN_MAX_NUM_OF_CHANNELS; 202 ++it, ++i) { 203 if ((*it)->band != first->band) 204 break; 205 if (((*it)->flags ^ first->flags) & 206 IEEE80211_CHAN_NO_IR) 207 break; 208 if (!(first->flags & IEEE80211_CHAN_NO_IR) && 209 (*it)->max_power != first->max_power) 210 break; 211 } 212 scan.band = first->band; 213 214 if (priv->scan.req->no_cck) 215 scan.max_tx_rate = WSM_TRANSMIT_RATE_6; 216 else 217 scan.max_tx_rate = WSM_TRANSMIT_RATE_1; 218 scan.num_probes = 219 (first->flags & IEEE80211_CHAN_NO_IR) ? 0 : 2; 220 scan.num_ssids = priv->scan.n_ssids; 221 scan.ssids = &priv->scan.ssids[0]; 222 scan.num_channels = it - priv->scan.curr; 223 /* TODO: Is it optimal? */ 224 scan.probe_delay = 100; 225 /* It is not stated in WSM specification, however 226 * FW team says that driver may not use FG scan 227 * when joined. 228 */ 229 if (priv->join_status == CW1200_JOIN_STATUS_STA) { 230 scan.type = WSM_SCAN_TYPE_BACKGROUND; 231 scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND; 232 } 233 scan.ch = kzalloc( 234 sizeof(struct wsm_scan_ch) * (it - priv->scan.curr), 235 GFP_KERNEL); 236 if (!scan.ch) { 237 priv->scan.status = -ENOMEM; 238 goto fail; 239 } 240 for (i = 0; i < scan.num_channels; ++i) { 241 scan.ch[i].number = priv->scan.curr[i]->hw_value; 242 if (priv->scan.curr[i]->flags & IEEE80211_CHAN_NO_IR) { 243 scan.ch[i].min_chan_time = 50; 244 scan.ch[i].max_chan_time = 100; 245 } else { 246 scan.ch[i].min_chan_time = 10; 247 scan.ch[i].max_chan_time = 25; 248 } 249 } 250 if (!(first->flags & IEEE80211_CHAN_NO_IR) && 251 priv->scan.output_power != first->max_power) { 252 priv->scan.output_power = first->max_power; 253 wsm_set_output_power(priv, 254 priv->scan.output_power * 10); 255 } 256 priv->scan.status = cw1200_scan_start(priv, &scan); 257 kfree(scan.ch); 258 if (priv->scan.status) 259 goto fail; 260 priv->scan.curr = it; 261 } 262 mutex_unlock(&priv->conf_mutex); 263 return; 264 265 fail: 266 priv->scan.curr = priv->scan.end; 267 mutex_unlock(&priv->conf_mutex); 268 queue_work(priv->workqueue, &priv->scan.work); 269 return; 270 } 271 272 static void cw1200_scan_restart_delayed(struct cw1200_common *priv) 273 { 274 /* FW bug: driver has to restart p2p-dev mode after scan. */ 275 if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) { 276 cw1200_enable_listening(priv); 277 cw1200_update_filtering(priv); 278 } 279 280 if (priv->delayed_unjoin) { 281 priv->delayed_unjoin = false; 282 if (queue_work(priv->workqueue, &priv->unjoin_work) <= 0) 283 wsm_unlock_tx(priv); 284 } else if (priv->delayed_link_loss) { 285 wiphy_dbg(priv->hw->wiphy, "[CQM] Requeue BSS loss.\n"); 286 priv->delayed_link_loss = 0; 287 cw1200_cqm_bssloss_sm(priv, 1, 0, 0); 288 } 289 } 290 291 static void cw1200_scan_complete(struct cw1200_common *priv) 292 { 293 queue_delayed_work(priv->workqueue, &priv->clear_recent_scan_work, HZ); 294 if (priv->scan.direct_probe) { 295 wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe complete.\n"); 296 cw1200_scan_restart_delayed(priv); 297 priv->scan.direct_probe = 0; 298 up(&priv->scan.lock); 299 wsm_unlock_tx(priv); 300 } else { 301 cw1200_scan_work(&priv->scan.work); 302 } 303 } 304 305 void cw1200_scan_failed_cb(struct cw1200_common *priv) 306 { 307 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) 308 /* STA is stopped. */ 309 return; 310 311 if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) { 312 priv->scan.status = -EIO; 313 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0); 314 } 315 } 316 317 318 void cw1200_scan_complete_cb(struct cw1200_common *priv, 319 struct wsm_scan_complete *arg) 320 { 321 if (priv->mode == NL80211_IFTYPE_UNSPECIFIED) 322 /* STA is stopped. */ 323 return; 324 325 if (cancel_delayed_work_sync(&priv->scan.timeout) > 0) { 326 priv->scan.status = 1; 327 queue_delayed_work(priv->workqueue, &priv->scan.timeout, 0); 328 } 329 } 330 331 void cw1200_clear_recent_scan_work(struct work_struct *work) 332 { 333 struct cw1200_common *priv = 334 container_of(work, struct cw1200_common, 335 clear_recent_scan_work.work); 336 atomic_xchg(&priv->recent_scan, 0); 337 } 338 339 void cw1200_scan_timeout(struct work_struct *work) 340 { 341 struct cw1200_common *priv = 342 container_of(work, struct cw1200_common, scan.timeout.work); 343 if (atomic_xchg(&priv->scan.in_progress, 0)) { 344 if (priv->scan.status > 0) { 345 priv->scan.status = 0; 346 } else if (!priv->scan.status) { 347 wiphy_warn(priv->hw->wiphy, 348 "Timeout waiting for scan complete notification.\n"); 349 priv->scan.status = -ETIMEDOUT; 350 priv->scan.curr = priv->scan.end; 351 wsm_stop_scan(priv); 352 } 353 cw1200_scan_complete(priv); 354 } 355 } 356 357 void cw1200_probe_work(struct work_struct *work) 358 { 359 struct cw1200_common *priv = 360 container_of(work, struct cw1200_common, scan.probe_work.work); 361 u8 queue_id = cw1200_queue_get_queue_id(priv->pending_frame_id); 362 struct cw1200_queue *queue = &priv->tx_queue[queue_id]; 363 const struct cw1200_txpriv *txpriv; 364 struct wsm_tx *wsm; 365 struct wsm_template_frame frame = { 366 .frame_type = WSM_FRAME_TYPE_PROBE_REQUEST, 367 }; 368 struct wsm_ssid ssids[1] = {{ 369 .length = 0, 370 } }; 371 struct wsm_scan_ch ch[1] = {{ 372 .min_chan_time = 0, 373 .max_chan_time = 10, 374 } }; 375 struct wsm_scan scan = { 376 .type = WSM_SCAN_TYPE_FOREGROUND, 377 .num_probes = 1, 378 .probe_delay = 0, 379 .num_channels = 1, 380 .ssids = ssids, 381 .ch = ch, 382 }; 383 u8 *ies; 384 size_t ies_len; 385 int ret; 386 387 wiphy_dbg(priv->hw->wiphy, "[SCAN] Direct probe work.\n"); 388 389 mutex_lock(&priv->conf_mutex); 390 if (down_trylock(&priv->scan.lock)) { 391 /* Scan is already in progress. Requeue self. */ 392 schedule(); 393 queue_delayed_work(priv->workqueue, &priv->scan.probe_work, 394 msecs_to_jiffies(100)); 395 mutex_unlock(&priv->conf_mutex); 396 return; 397 } 398 399 /* Make sure we still have a pending probe req */ 400 if (cw1200_queue_get_skb(queue, priv->pending_frame_id, 401 &frame.skb, &txpriv)) { 402 up(&priv->scan.lock); 403 mutex_unlock(&priv->conf_mutex); 404 wsm_unlock_tx(priv); 405 return; 406 } 407 wsm = (struct wsm_tx *)frame.skb->data; 408 scan.max_tx_rate = wsm->max_tx_rate; 409 scan.band = (priv->channel->band == NL80211_BAND_5GHZ) ? 410 WSM_PHY_BAND_5G : WSM_PHY_BAND_2_4G; 411 if (priv->join_status == CW1200_JOIN_STATUS_STA || 412 priv->join_status == CW1200_JOIN_STATUS_IBSS) { 413 scan.type = WSM_SCAN_TYPE_BACKGROUND; 414 scan.flags = WSM_SCAN_FLAG_FORCE_BACKGROUND; 415 } 416 ch[0].number = priv->channel->hw_value; 417 418 skb_pull(frame.skb, txpriv->offset); 419 420 ies = &frame.skb->data[sizeof(struct ieee80211_hdr_3addr)]; 421 ies_len = frame.skb->len - sizeof(struct ieee80211_hdr_3addr); 422 423 if (ies_len) { 424 u8 *ssidie = 425 (u8 *)cfg80211_find_ie(WLAN_EID_SSID, ies, ies_len); 426 if (ssidie && ssidie[1] && ssidie[1] <= sizeof(ssids[0].ssid)) { 427 u8 *nextie = &ssidie[2 + ssidie[1]]; 428 /* Remove SSID from the IE list. It has to be provided 429 * as a separate argument in cw1200_scan_start call 430 */ 431 432 /* Store SSID localy */ 433 ssids[0].length = ssidie[1]; 434 memcpy(ssids[0].ssid, &ssidie[2], ssids[0].length); 435 scan.num_ssids = 1; 436 437 /* Remove SSID from IE list */ 438 ssidie[1] = 0; 439 memmove(&ssidie[2], nextie, &ies[ies_len] - nextie); 440 skb_trim(frame.skb, frame.skb->len - ssids[0].length); 441 } 442 } 443 444 /* FW bug: driver has to restart p2p-dev mode after scan */ 445 if (priv->join_status == CW1200_JOIN_STATUS_MONITOR) 446 cw1200_disable_listening(priv); 447 ret = wsm_set_template_frame(priv, &frame); 448 priv->scan.direct_probe = 1; 449 if (!ret) { 450 wsm_flush_tx(priv); 451 ret = cw1200_scan_start(priv, &scan); 452 } 453 mutex_unlock(&priv->conf_mutex); 454 455 skb_push(frame.skb, txpriv->offset); 456 if (!ret) 457 IEEE80211_SKB_CB(frame.skb)->flags |= IEEE80211_TX_STAT_ACK; 458 BUG_ON(cw1200_queue_remove(queue, priv->pending_frame_id)); 459 460 if (ret) { 461 priv->scan.direct_probe = 0; 462 up(&priv->scan.lock); 463 wsm_unlock_tx(priv); 464 } 465 466 return; 467 } 468