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 (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                 if (ret < 0)
 138                         break;
 139                 break;
 140         case EVENT_EXIT_POWER_SAVE_FAIL:
 141                 wl1271_debug(DEBUG_PSM, "PSM exit failed");
 142
 143                 if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
 144                         wl->psm_entry_retry = 0;
 145                         break;
 146                 }
 147
 148                 /* make sure the firmware goes to active mode - the frame to
 149                    be sent next will indicate to the AP, that we are active. */
 150                 ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
 151                                          wl->basic_rate, false);
 152                 break;
 153         case EVENT_EXIT_POWER_SAVE_SUCCESS:
 154         default:
 155                 break;
 156         }
 157
 158         return ret;
 159 }
 160
 161 static void wl1271_event_rssi_trigger(struct wl1271 *wl,
 162                                       struct event_mailbox *mbox)
 163 {
 164         enum nl80211_cqm_rssi_threshold_event event;
 165         s8 metric = mbox->rssi_snr_trigger_metric[0];
 166
 167         wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
 168
 169         if (metric <= wl->rssi_thold)
 170                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
 171         else
 172                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
 173
 174         if (event != wl->last_rssi_event)
 175                 ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
 176         wl->last_rssi_event = event;
 177 }
 178
 179 static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
 180 {
 181         wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
 182         wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
 183         wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
 184 }
 185
 186 static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
 187 {
 188         int ret;
 189         u32 vector;
 190         bool beacon_loss = false;
 191
 192         wl1271_event_mbox_dump(mbox);
 193
 194         vector = le32_to_cpu(mbox->events_vector);
 195         vector &= ~(le32_to_cpu(mbox->events_mask));
 196         wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 197
 198         if (vector & SCAN_COMPLETE_EVENT_ID) {
 199                 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
 200                              mbox->scheduled_scan_status);
 201
 202                 wl1271_scan_stm(wl);
 203         }
 204
 205         /* disable dynamic PS when requested by the firmware */
 206         if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
 207             wl->bss_type == BSS_TYPE_STA_BSS) {
 208                 if (mbox->soft_gemini_sense_info)
 209                         ieee80211_disable_dyn_ps(wl->vif);
 210                 else
 211                         ieee80211_enable_dyn_ps(wl->vif);
 212         }
 213
 214         /*
 215          * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
 216          * filtering) is enabled. Without PSM, the stack will receive all
 217          * beacons and can detect beacon loss by itself.
 218          *
 219          * As there's possibility that the driver disables PSM before receiving
 220          * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
 221          *
 222          */
 223         if (vector & BSS_LOSE_EVENT_ID) {
 224                 wl1271_info("Beacon loss detected.");
 225
 226                 /* indicate to the stack, that beacons have been lost */
 227                 beacon_loss = true;
 228         }
 229
 230         if (vector & PS_REPORT_EVENT_ID) {
 231                 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
 232                 ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
 233                 if (ret < 0)
 234                         return ret;
 235         }
 236
 237         if (vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID)
 238                 wl1271_event_pspoll_delivery_fail(wl);
 239
 240         if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
 241                 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
 242                 if (wl->vif)
 243                         wl1271_event_rssi_trigger(wl, mbox);
 244         }
 245
 246         if (wl->vif && beacon_loss)
 247                 ieee80211_connection_loss(wl->vif);
 248
 249         return 0;
 250 }
 251
 252 int wl1271_event_unmask(struct wl1271 *wl)
 253 {
 254         int ret;
 255
 256         ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
 257         if (ret < 0)
 258                 return ret;
 259
 260         return 0;
 261 }
 262
 263 void wl1271_event_mbox_config(struct wl1271 *wl)
 264 {
 265         wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
 266         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 267
 268         wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 269                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 270 }
 271
 272 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
 273 {
 274         struct event_mailbox mbox;
 275         int ret;
 276
 277         wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 278
 279         if (mbox_num > 1)
 280                 return -EINVAL;
 281
 282         /* first we read the mbox descriptor */
 283         wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 284                     sizeof(struct event_mailbox), false);
 285
 286         /* process the descriptor */
 287         ret = wl1271_event_process(wl, &mbox);
 288         if (ret < 0)
 289                 return ret;
 290
 291         /* then we let the firmware know it can go on...*/
 292         wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 293
 294         return 0;
 295 }