drivers/net/wireless/wl12xx/wl1271_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 "wl1271.h"
  25 #include "wl1271_reg.h"
  26 #include "wl1271_io.h"
  27 #include "wl1271_event.h"
  28 #include "wl1271_ps.h"
  29 #include "wl1271_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 (!test_and_clear_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags))
  45                 goto out;
  46
  47         if (!test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags))
  48                 goto out;
  49
  50         /*
  51          * if we end up here, then we were in powersave when the pspoll
  52          * delivery failure occurred, and no-one changed state since, so
  53          * we should go back to powersave.
  54          */
  55         wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, true);
  56
  57 out:
  58         mutex_unlock(&wl->mutex);
  59 };
  60
  61 static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl)
  62 {
  63         int delay = wl->conf.conn.ps_poll_recovery_period;
  64         int ret;
  65
  66         wl->ps_poll_failures++;
  67         if (wl->ps_poll_failures == 1)
  68                 wl1271_info("AP with dysfunctional ps-poll, "
  69                             "trying to work around it.");
  70
  71         /* force active mode receive data from the AP */
  72         if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
  73                 ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE, true);
  74                 if (ret < 0)
  75                         return;
  76                 set_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags);
  77                 ieee80211_queue_delayed_work(wl->hw, &wl->pspoll_work,
  78                                              msecs_to_jiffies(delay));
  79         }
  80
  81         /*
  82          * If already in active mode, lets we should be getting data from
  83          * the AP right away. If we enter PSM too fast after this, and data
  84          * remains on the AP, we will get another event like this, and we'll
  85          * go into active once more.
  86          */
  87 }
  88
  89 static int wl1271_event_ps_report(struct wl1271 *wl,
  90                                   struct event_mailbox *mbox,
  91                                   bool *beacon_loss)
  92 {
  93         int ret = 0;
  94
  95         wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);
  96
  97         switch (mbox->ps_status) {
  98         case EVENT_ENTER_POWER_SAVE_FAIL:
  99                 wl1271_debug(DEBUG_PSM, "PSM entry failed");
 100
 101                 if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
 102                         /* remain in active mode */
 103                         wl->psm_entry_retry = 0;
 104                         break;
 105                 }
 106
 107                 if (wl->psm_entry_retry < wl->conf.conn.psm_entry_retries) {
 108                         wl->psm_entry_retry++;
 109                         ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
 110                                                  true);
 111                 } else {
 112                         wl1271_info("No ack to nullfunc from AP.");
 113                         wl->psm_entry_retry = 0;
 114                         *beacon_loss = true;
 115                 }
 116                 break;
 117         case EVENT_ENTER_POWER_SAVE_SUCCESS:
 118                 wl->psm_entry_retry = 0;
 119
 120                 /* enable beacon filtering */
 121                 ret = wl1271_acx_beacon_filter_opt(wl, true);
 122                 if (ret < 0)
 123                         break;
 124
 125                 /* enable beacon early termination */
 126                 ret = wl1271_acx_bet_enable(wl, true);
 127                 if (ret < 0)
 128                         break;
 129
 130                 /* go to extremely low power mode */
 131                 wl1271_ps_elp_sleep(wl);
 132                 if (ret < 0)
 133                         break;
 134                 break;
 135         case EVENT_EXIT_POWER_SAVE_FAIL:
 136                 wl1271_debug(DEBUG_PSM, "PSM exit failed");
 137
 138                 if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
 139                         wl->psm_entry_retry = 0;
 140                         break;
 141                 }
 142
 143                 /* make sure the firmware goes to active mode - the frame to
 144                    be sent next will indicate to the AP, that we are active. */
 145                 ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
 146                                          false);
 147                 break;
 148         case EVENT_EXIT_POWER_SAVE_SUCCESS:
 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_event_mbox_dump(struct event_mailbox *mbox)
 175 {
 176         wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
 177         wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
 178         wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
 179 }
 180
 181 static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
 182 {
 183         int ret;
 184         u32 vector;
 185         bool beacon_loss = false;
 186
 187         wl1271_event_mbox_dump(mbox);
 188
 189         vector = le32_to_cpu(mbox->events_vector);
 190         vector &= ~(le32_to_cpu(mbox->events_mask));
 191         wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 192
 193         if (vector & SCAN_COMPLETE_EVENT_ID) {
 194                 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
 195                              mbox->scheduled_scan_status);
 196
 197                 wl1271_scan_stm(wl);
 198         }
 199
 200         /* disable dynamic PS when requested by the firmware */
 201         if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
 202             wl->bss_type == BSS_TYPE_STA_BSS) {
 203                 if (mbox->soft_gemini_sense_info)
 204                         ieee80211_disable_dyn_ps(wl->vif);
 205                 else
 206                         ieee80211_enable_dyn_ps(wl->vif);
 207         }
 208
 209         /*
 210          * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
 211          * filtering) is enabled. Without PSM, the stack will receive all
 212          * beacons and can detect beacon loss by itself.
 213          *
 214          * As there's possibility that the driver disables PSM before receiving
 215          * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
 216          *
 217          */
 218         if (vector & BSS_LOSE_EVENT_ID) {
 219                 wl1271_info("Beacon loss detected.");
 220
 221                 /* indicate to the stack, that beacons have been lost */
 222                 beacon_loss = true;
 223         }
 224
 225         if (vector & PS_REPORT_EVENT_ID) {
 226                 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
 227                 ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
 228                 if (ret < 0)
 229                         return ret;
 230         }
 231
 232         if (vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID)
 233                 wl1271_event_pspoll_delivery_fail(wl);
 234
 235         if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
 236                 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
 237                 if (wl->vif)
 238                         wl1271_event_rssi_trigger(wl, mbox);
 239         }
 240
 241         if (wl->vif && beacon_loss)
 242                 ieee80211_connection_loss(wl->vif);
 243
 244         return 0;
 245 }
 246
 247 int wl1271_event_unmask(struct wl1271 *wl)
 248 {
 249         int ret;
 250
 251         ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
 252         if (ret < 0)
 253                 return ret;
 254
 255         return 0;
 256 }
 257
 258 void wl1271_event_mbox_config(struct wl1271 *wl)
 259 {
 260         wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
 261         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 262
 263         wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 264                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 265 }
 266
 267 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
 268 {
 269         struct event_mailbox mbox;
 270         int ret;
 271
 272         wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 273
 274         if (mbox_num > 1)
 275                 return -EINVAL;
 276
 277         /* first we read the mbox descriptor */
 278         wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 279                     sizeof(struct event_mailbox), false);
 280
 281         /* process the descriptor */
 282         ret = wl1271_event_process(wl, &mbox);
 283         if (ret < 0)
 284                 return ret;
 285
 286         /* then we let the firmware know it can go on...*/
 287         wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 288
 289         return 0;
 290 }