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