drivers/net/wireless/wl12xx/event.c

   1 /*
   2  * This file is part of wl1271
   3  *
   4  * Copyright (C) 2008-2009 Nokia Corporation
   5  *
   6  * Contact: Luciano Coelho <luciano.coelho@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include "wl12xx.h"
  25 #include "reg.h"
  26 #include "io.h"
  27 #include "event.h"
  28 #include "ps.h"
  29 #include "scan.h"
  30 #include "wl12xx_80211.h"
  31
  32 void wl1271_pspoll_work(struct work_struct *work)
  33 {
  34         struct ieee80211_vif *vif;
  35         struct wl12xx_vif *wlvif;
  36         struct delayed_work *dwork;
  37         struct wl1271 *wl;
  38         int ret;
  39
  40         dwork = container_of(work, struct delayed_work, work);
  41         wlvif = container_of(dwork, struct wl12xx_vif, pspoll_work);
  42         vif = container_of((void *)wlvif, struct ieee80211_vif, drv_priv);
  43         wl = wlvif->wl;
  44
  45         wl1271_debug(DEBUG_EVENT, "pspoll work");
  46
  47         mutex_lock(&wl->mutex);
  48
  49         if (unlikely(wl->state == WL1271_STATE_OFF))
  50                 goto out;
  51
  52         if (!test_and_clear_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags))
  53                 goto out;
  54
  55         if (!test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
  56                 goto out;
  57
  58         /*
  59          * if we end up here, then we were in powersave when the pspoll
  60          * delivery failure occurred, and no-one changed state since, so
  61          * we should go back to powersave.
  62          */
  63         ret = wl1271_ps_elp_wakeup(wl);
  64         if (ret < 0)
  65                 goto out;
  66
  67         wl1271_ps_set_mode(wl, wlvif, STATION_POWER_SAVE_MODE,
  68                            wlvif->basic_rate, true);
  69
  70         wl1271_ps_elp_sleep(wl);
  71 out:
  72         mutex_unlock(&wl->mutex);
  73 };
  74
  75 static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl,
  76                                               struct wl12xx_vif *wlvif)
  77 {
  78         int delay = wl->conf.conn.ps_poll_recovery_period;
  79         int ret;
  80
  81         wl->ps_poll_failures++;
  82         if (wl->ps_poll_failures == 1)
  83                 wl1271_info("AP with dysfunctional ps-poll, "
  84                             "trying to work around it.");
  85
  86         /* force active mode receive data from the AP */
  87         if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
  88                 ret = wl1271_ps_set_mode(wl, wlvif, STATION_ACTIVE_MODE,
  89                                          wlvif->basic_rate, true);
  90                 if (ret < 0)
  91                         return;
  92                 set_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags);
  93                 ieee80211_queue_delayed_work(wl->hw, &wlvif->pspoll_work,
  94                                              msecs_to_jiffies(delay));
  95         }
  96
  97         /*
  98          * If already in active mode, lets we should be getting data from
  99          * the AP right away. If we enter PSM too fast after this, and data
 100          * remains on the AP, we will get another event like this, and we'll
 101          * go into active once more.
 102          */
 103 }
 104
 105 static int wl1271_event_ps_report(struct wl1271 *wl,
 106                                   struct wl12xx_vif *wlvif,
 107                                   struct event_mailbox *mbox,
 108                                   bool *beacon_loss)
 109 {
 110         int ret = 0;
 111         u32 total_retries = wl->conf.conn.psm_entry_retries;
 112
 113         wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);
 114
 115         switch (mbox->ps_status) {
 116         case EVENT_ENTER_POWER_SAVE_FAIL:
 117                 wl1271_debug(DEBUG_PSM, "PSM entry failed");
 118
 119                 if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
 120                         /* remain in active mode */
 121                         wl->psm_entry_retry = 0;
 122                         break;
 123                 }
 124
 125                 if (wl->psm_entry_retry < total_retries) {
 126                         wl->psm_entry_retry++;
 127                         ret = wl1271_ps_set_mode(wl, wlvif,
 128                                                  STATION_POWER_SAVE_MODE,
 129                                                  wlvif->basic_rate, true);
 130                 } else {
 131                         wl1271_info("No ack to nullfunc from AP.");
 132                         wl->psm_entry_retry = 0;
 133                         *beacon_loss = true;
 134                 }
 135                 break;
 136         case EVENT_ENTER_POWER_SAVE_SUCCESS:
 137                 wl->psm_entry_retry = 0;
 138
 139                 /* enable beacon filtering */
 140                 ret = wl1271_acx_beacon_filter_opt(wl, wlvif, true);
 141                 if (ret < 0)
 142                         break;
 143
 144                 /*
 145                  * BET has only a minor effect in 5GHz and masks
 146                  * channel switch IEs, so we only enable BET on 2.4GHz
 147                 */
 148                 if (wl->band == IEEE80211_BAND_2GHZ)
 149                         /* enable beacon early termination */
 150                         ret = wl1271_acx_bet_enable(wl, wlvif, true);
 151
 152                 if (wl->ps_compl) {
 153                         complete(wl->ps_compl);
 154                         wl->ps_compl = NULL;
 155                 }
 156                 break;
 157         default:
 158                 break;
 159         }
 160
 161         return ret;
 162 }
 163
 164 static void wl1271_event_rssi_trigger(struct wl1271 *wl,
 165                                       struct event_mailbox *mbox)
 166 {
 167         enum nl80211_cqm_rssi_threshold_event event;
 168         s8 metric = mbox->rssi_snr_trigger_metric[0];
 169
 170         wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
 171
 172         if (metric <= wl->rssi_thold)
 173                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
 174         else
 175                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
 176
 177         if (event != wl->last_rssi_event)
 178                 ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
 179         wl->last_rssi_event = event;
 180 }
 181
 182 static void wl1271_stop_ba_event(struct wl1271 *wl, struct wl12xx_vif *wlvif)
 183 {
 184         if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
 185                 if (!wl->ba_rx_bitmap)
 186                         return;
 187                 ieee80211_stop_rx_ba_session(wl->vif, wl->ba_rx_bitmap,
 188                                              wl->vif->bss_conf.bssid);
 189         } else {
 190                 int i;
 191                 struct wl1271_link *lnk;
 192                 for (i = WL1271_AP_STA_HLID_START; i < AP_MAX_LINKS; i++) {
 193                         lnk = &wl->links[i];
 194                         if (!wl1271_is_active_sta(wl, i) || !lnk->ba_bitmap)
 195                                 continue;
 196
 197                         ieee80211_stop_rx_ba_session(wl->vif,
 198                                                      lnk->ba_bitmap,
 199                                                      lnk->addr);
 200                 }
 201         }
 202 }
 203
 204 static void wl12xx_event_soft_gemini_sense(struct wl1271 *wl,
 205                                                u8 enable)
 206 {
 207         if (enable) {
 208                 /* disable dynamic PS when requested by the firmware */
 209                 ieee80211_disable_dyn_ps(wl->vif);
 210                 set_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
 211         } else {
 212                 ieee80211_enable_dyn_ps(wl->vif);
 213                 clear_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags);
 214                 wl1271_recalc_rx_streaming(wl);
 215         }
 216
 217 }
 218
 219 static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
 220 {
 221         wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
 222         wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
 223         wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
 224 }
 225
 226 static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
 227 {
 228         struct ieee80211_vif *vif = wl->vif; /* TODO: get as param */
 229         struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 230         int ret;
 231         u32 vector;
 232         bool beacon_loss = false;
 233         bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
 234         bool disconnect_sta = false;
 235         unsigned long sta_bitmap = 0;
 236
 237         wl1271_event_mbox_dump(mbox);
 238
 239         vector = le32_to_cpu(mbox->events_vector);
 240         vector &= ~(le32_to_cpu(mbox->events_mask));
 241         wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 242
 243         if (vector & SCAN_COMPLETE_EVENT_ID) {
 244                 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
 245                              mbox->scheduled_scan_status);
 246
 247                 wl1271_scan_stm(wl, wl->scan_vif);
 248         }
 249
 250         if (vector & PERIODIC_SCAN_REPORT_EVENT_ID) {
 251                 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_REPORT_EVENT "
 252                              "(status 0x%0x)", mbox->scheduled_scan_status);
 253
 254                 wl1271_scan_sched_scan_results(wl);
 255         }
 256
 257         if (vector & PERIODIC_SCAN_COMPLETE_EVENT_ID) {
 258                 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_COMPLETE_EVENT "
 259                              "(status 0x%0x)", mbox->scheduled_scan_status);
 260                 if (wl->sched_scanning) {
 261                         wl1271_scan_sched_scan_stop(wl);
 262                         ieee80211_sched_scan_stopped(wl->hw);
 263                 }
 264         }
 265
 266         if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
 267             wlvif->bss_type == BSS_TYPE_STA_BSS)
 268                 wl12xx_event_soft_gemini_sense(wl,
 269                                                mbox->soft_gemini_sense_info);
 270
 271         /*
 272          * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
 273          * filtering) is enabled. Without PSM, the stack will receive all
 274          * beacons and can detect beacon loss by itself.
 275          *
 276          * As there's possibility that the driver disables PSM before receiving
 277          * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
 278          *
 279          */
 280         if ((vector & BSS_LOSE_EVENT_ID) && !is_ap) {
 281                 wl1271_info("Beacon loss detected.");
 282
 283                 /* indicate to the stack, that beacons have been lost */
 284                 beacon_loss = true;
 285         }
 286
 287         if ((vector & PS_REPORT_EVENT_ID) && !is_ap) {
 288                 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
 289                 ret = wl1271_event_ps_report(wl, wlvif, mbox, &beacon_loss);
 290                 if (ret < 0)
 291                         return ret;
 292         }
 293
 294         if ((vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID) && !is_ap)
 295                 wl1271_event_pspoll_delivery_fail(wl, wlvif);
 296
 297         if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
 298                 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
 299                 if (wl->vif)
 300                         wl1271_event_rssi_trigger(wl, mbox);
 301         }
 302
 303         if ((vector & BA_SESSION_RX_CONSTRAINT_EVENT_ID)) {
 304                 wl1271_debug(DEBUG_EVENT, "BA_SESSION_RX_CONSTRAINT_EVENT_ID. "
 305                              "ba_allowed = 0x%x", mbox->rx_ba_allowed);
 306
 307                 wl->ba_allowed = !!mbox->rx_ba_allowed;
 308
 309                 if (wl->vif && !wl->ba_allowed)
 310                         wl1271_stop_ba_event(wl, wlvif);
 311         }
 312
 313         if ((vector & CHANNEL_SWITCH_COMPLETE_EVENT_ID) && !is_ap) {
 314                 wl1271_debug(DEBUG_EVENT, "CHANNEL_SWITCH_COMPLETE_EVENT_ID. "
 315                                           "status = 0x%x",
 316                                           mbox->channel_switch_status);
 317                 /*
 318                  * That event uses for two cases:
 319                  * 1) channel switch complete with status=0
 320                  * 2) channel switch failed status=1
 321                  */
 322                 if (test_and_clear_bit(WL1271_FLAG_CS_PROGRESS, &wl->flags) &&
 323                     (wl->vif))
 324                         ieee80211_chswitch_done(wl->vif,
 325                                 mbox->channel_switch_status ? false : true);
 326         }
 327
 328         if ((vector & DUMMY_PACKET_EVENT_ID)) {
 329                 wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
 330                 if (wl->vif)
 331                         wl1271_tx_dummy_packet(wl);
 332         }
 333
 334         /*
 335          * "TX retries exceeded" has a different meaning according to mode.
 336          * In AP mode the offending station is disconnected.
 337          */
 338         if ((vector & MAX_TX_RETRY_EVENT_ID) && is_ap) {
 339                 wl1271_debug(DEBUG_EVENT, "MAX_TX_RETRY_EVENT_ID");
 340                 sta_bitmap |= le16_to_cpu(mbox->sta_tx_retry_exceeded);
 341                 disconnect_sta = true;
 342         }
 343
 344         if ((vector & INACTIVE_STA_EVENT_ID) && is_ap) {
 345                 wl1271_debug(DEBUG_EVENT, "INACTIVE_STA_EVENT_ID");
 346                 sta_bitmap |= le16_to_cpu(mbox->sta_aging_status);
 347                 disconnect_sta = true;
 348         }
 349
 350         if (is_ap && disconnect_sta) {
 351                 u32 num_packets = wl->conf.tx.max_tx_retries;
 352                 struct ieee80211_sta *sta;
 353                 const u8 *addr;
 354                 int h;
 355
 356                 for (h = find_first_bit(&sta_bitmap, AP_MAX_LINKS);
 357                      h < AP_MAX_LINKS;
 358                      h = find_next_bit(&sta_bitmap, AP_MAX_LINKS, h+1)) {
 359                         if (!wl1271_is_active_sta(wl, h))
 360                                 continue;
 361
 362                         addr = wl->links[h].addr;
 363
 364                         rcu_read_lock();
 365                         sta = ieee80211_find_sta(wl->vif, addr);
 366                         if (sta) {
 367                                 wl1271_debug(DEBUG_EVENT, "remove sta %d", h);
 368                                 ieee80211_report_low_ack(sta, num_packets);
 369                         }
 370                         rcu_read_unlock();
 371                 }
 372         }
 373
 374         if (wl->vif && beacon_loss)
 375                 ieee80211_connection_loss(wl->vif);
 376
 377         return 0;
 378 }
 379
 380 int wl1271_event_unmask(struct wl1271 *wl)
 381 {
 382         int ret;
 383
 384         ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
 385         if (ret < 0)
 386                 return ret;
 387
 388         return 0;
 389 }
 390
 391 void wl1271_event_mbox_config(struct wl1271 *wl)
 392 {
 393         wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
 394         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 395
 396         wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 397                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 398 }
 399
 400 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
 401 {
 402         struct event_mailbox mbox;
 403         int ret;
 404
 405         wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 406
 407         if (mbox_num > 1)
 408                 return -EINVAL;
 409
 410         /* first we read the mbox descriptor */
 411         wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 412                     sizeof(struct event_mailbox), false);
 413
 414         /* process the descriptor */
 415         ret = wl1271_event_process(wl, &mbox);
 416         if (ret < 0)
 417                 return ret;
 418
 419         /* then we let the firmware know it can go on...*/
 420         wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 421
 422         return 0;
 423 }