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
  37         dwork = container_of(work, struct delayed_work, work);
  38         wl = container_of(dwork, struct wl1271, pspoll_work);
  39
  40         wl1271_debug(DEBUG_EVENT, "pspoll work");
  41
  42         mutex_lock(&wl->mutex);
  43
  44         if (unlikely(wl->state == WL1271_STATE_OFF))
  45                 goto out;
  46
  47         if (!test_and_clear_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags))
  48                 goto out;
  49
  50         if (!test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
  51                 goto out;
  52
  53         /*
  54          * if we end up here, then we were in powersave when the pspoll
  55          * delivery failure occurred, and no-one changed state since, so
  56          * we should go back to powersave.
  57          */
  58         wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true);
  59
  60 out:
  61         mutex_unlock(&wl->mutex);
  62 };
  63
  64 static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl)
  65 {
  66         int delay = wl->conf.conn.ps_poll_recovery_period;
  67         int ret;
  68
  69         wl->ps_poll_failures++;
  70         if (wl->ps_poll_failures == 1)
  71                 wl1271_info("AP with dysfunctional ps-poll, "
  72                             "trying to work around it.");
  73
  74         /* force active mode receive data from the AP */
  75         if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
  76                 ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
  77                                          wl->basic_rate, true);
  78                 if (ret < 0)
  79                         return;
  80                 set_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags);
  81                 ieee80211_queue_delayed_work(wl->hw, &wl->pspoll_work,
  82                                              msecs_to_jiffies(delay));
  83         }
  84
  85         /*
  86          * If already in active mode, lets we should be getting data from
  87          * the AP right away. If we enter PSM too fast after this, and data
  88          * remains on the AP, we will get another event like this, and we'll
  89          * go into active once more.
  90          */
  91 }
  92
  93 static int wl1271_event_ps_report(struct wl1271 *wl,
  94                                   struct event_mailbox *mbox,
  95                                   bool *beacon_loss)
  96 {
  97         int ret = 0;
  98         u32 total_retries = wl->conf.conn.psm_entry_retries;
  99
 100         wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);
 101
 102         switch (mbox->ps_status) {
 103         case EVENT_ENTER_POWER_SAVE_FAIL:
 104                 wl1271_debug(DEBUG_PSM, "PSM entry failed");
 105
 106                 if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
 107                         /* remain in active mode */
 108                         wl->psm_entry_retry = 0;
 109                         break;
 110                 }
 111
 112                 if (wl->psm_entry_retry < total_retries) {
 113                         wl->psm_entry_retry++;
 114                         ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
 115                                                  wl->basic_rate, true);
 116                 } else {
 117                         wl1271_info("No ack to nullfunc from AP.");
 118                         wl->psm_entry_retry = 0;
 119                         *beacon_loss = true;
 120                 }
 121                 break;
 122         case EVENT_ENTER_POWER_SAVE_SUCCESS:
 123                 wl->psm_entry_retry = 0;
 124
 125                 /* enable beacon filtering */
 126                 ret = wl1271_acx_beacon_filter_opt(wl, true);
 127                 if (ret < 0)
 128                         break;
 129
 130                 /* enable beacon early termination */
 131                 ret = wl1271_acx_bet_enable(wl, true);
 132                 if (ret < 0)
 133                         break;
 134
 135                 /* go to extremely low power mode */
 136                 wl1271_ps_elp_sleep(wl);
 137                 break;
 138         case EVENT_EXIT_POWER_SAVE_FAIL:
 139                 wl1271_debug(DEBUG_PSM, "PSM exit failed");
 140
 141                 if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
 142                         wl->psm_entry_retry = 0;
 143                         break;
 144                 }
 145
 146                 /* make sure the firmware goes to active mode - the frame to
 147                    be sent next will indicate to the AP, that we are active. */
 148                 ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
 149                                          wl->basic_rate, false);
 150                 break;
 151         case EVENT_EXIT_POWER_SAVE_SUCCESS:
 152         default:
 153                 break;
 154         }
 155
 156         return ret;
 157 }
 158
 159 static void wl1271_event_rssi_trigger(struct wl1271 *wl,
 160                                       struct event_mailbox *mbox)
 161 {
 162         enum nl80211_cqm_rssi_threshold_event event;
 163         s8 metric = mbox->rssi_snr_trigger_metric[0];
 164
 165         wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
 166
 167         if (metric <= wl->rssi_thold)
 168                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
 169         else
 170                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
 171
 172         if (event != wl->last_rssi_event)
 173                 ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
 174         wl->last_rssi_event = event;
 175 }
 176
 177 static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
 178 {
 179         wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
 180         wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
 181         wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
 182 }
 183
 184 static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
 185 {
 186         int ret;
 187         u32 vector;
 188         bool beacon_loss = false;
 189         bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
 190
 191         wl1271_event_mbox_dump(mbox);
 192
 193         vector = le32_to_cpu(mbox->events_vector);
 194         vector &= ~(le32_to_cpu(mbox->events_mask));
 195         wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 196
 197         if (vector & SCAN_COMPLETE_EVENT_ID) {
 198                 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
 199                              mbox->scheduled_scan_status);
 200
 201                 wl1271_scan_stm(wl);
 202         }
 203
 204         /* disable dynamic PS when requested by the firmware */
 205         if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
 206             wl->bss_type == BSS_TYPE_STA_BSS) {
 207                 if (mbox->soft_gemini_sense_info)
 208                         ieee80211_disable_dyn_ps(wl->vif);
 209                 else
 210                         ieee80211_enable_dyn_ps(wl->vif);
 211         }
 212
 213         /*
 214          * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
 215          * filtering) is enabled. Without PSM, the stack will receive all
 216          * beacons and can detect beacon loss by itself.
 217          *
 218          * As there's possibility that the driver disables PSM before receiving
 219          * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
 220          *
 221          */
 222         if ((vector & BSS_LOSE_EVENT_ID) && !is_ap) {
 223                 wl1271_info("Beacon loss detected.");
 224
 225                 /* indicate to the stack, that beacons have been lost */
 226                 beacon_loss = true;
 227         }
 228
 229         if ((vector & PS_REPORT_EVENT_ID) && !is_ap) {
 230                 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
 231                 ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
 232                 if (ret < 0)
 233                         return ret;
 234         }
 235
 236         if ((vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID) && !is_ap)
 237                 wl1271_event_pspoll_delivery_fail(wl);
 238
 239         if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
 240                 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
 241                 if (wl->vif)
 242                         wl1271_event_rssi_trigger(wl, mbox);
 243         }
 244
 245         if (wl->vif && beacon_loss)
 246                 ieee80211_connection_loss(wl->vif);
 247
 248         return 0;
 249 }
 250
 251 int wl1271_event_unmask(struct wl1271 *wl)
 252 {
 253         int ret;
 254
 255         ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
 256         if (ret < 0)
 257                 return ret;
 258
 259         return 0;
 260 }
 261
 262 void wl1271_event_mbox_config(struct wl1271 *wl)
 263 {
 264         wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
 265         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 266
 267         wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 268                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 269 }
 270
 271 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
 272 {
 273         struct event_mailbox mbox;
 274         int ret;
 275
 276         wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 277
 278         if (mbox_num > 1)
 279                 return -EINVAL;
 280
 281         /* first we read the mbox descriptor */
 282         wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 283                     sizeof(struct event_mailbox), false);
 284
 285         /* process the descriptor */
 286         ret = wl1271_event_process(wl, &mbox);
 287         if (ret < 0)
 288                 return ret;
 289
 290         /* then we let the firmware know it can go on...*/
 291         wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 292
 293         return 0;
 294 }