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                 /* enable beacon early termination */
 137                 ret = wl1271_acx_bet_enable(wl, true);
 138                 if (ret < 0)
 139                         break;
 140
 141                 if (wl->ps_compl) {
 142                         complete(wl->ps_compl);
 143                         wl->ps_compl = NULL;
 144                 }
 145                 break;
 146         default:
 147                 break;
 148         }
 149
 150         return ret;
 151 }
 152
 153 static void wl1271_event_rssi_trigger(struct wl1271 *wl,
 154                                       struct event_mailbox *mbox)
 155 {
 156         enum nl80211_cqm_rssi_threshold_event event;
 157         s8 metric = mbox->rssi_snr_trigger_metric[0];
 158
 159         wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
 160
 161         if (metric <= wl->rssi_thold)
 162                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
 163         else
 164                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
 165
 166         if (event != wl->last_rssi_event)
 167                 ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
 168         wl->last_rssi_event = event;
 169 }
 170
 171 static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
 172 {
 173         wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
 174         wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
 175         wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
 176 }
 177
 178 static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
 179 {
 180         int ret;
 181         u32 vector;
 182         bool beacon_loss = false;
 183         bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS);
 184
 185         wl1271_event_mbox_dump(mbox);
 186
 187         vector = le32_to_cpu(mbox->events_vector);
 188         vector &= ~(le32_to_cpu(mbox->events_mask));
 189         wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 190
 191         if (vector & SCAN_COMPLETE_EVENT_ID) {
 192                 wl1271_debug(DEBUG_EVENT, "status: 0x%x",
 193                              mbox->scheduled_scan_status);
 194
 195                 wl1271_scan_stm(wl);
 196         }
 197
 198         if (vector & PERIODIC_SCAN_REPORT_EVENT_ID) {
 199                 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_REPORT_EVENT "
 200                              "(status 0x%0x)", mbox->scheduled_scan_status);
 201
 202                 wl1271_scan_sched_scan_results(wl);
 203         }
 204
 205         if (vector & PERIODIC_SCAN_COMPLETE_EVENT_ID) {
 206                 wl1271_debug(DEBUG_EVENT, "PERIODIC_SCAN_COMPLETE_EVENT "
 207                              "(status 0x%0x)", mbox->scheduled_scan_status);
 208                 if (wl->sched_scanning) {
 209                         wl1271_scan_sched_scan_stop(wl);
 210                         ieee80211_sched_scan_stopped(wl->hw);
 211                 }
 212         }
 213
 214         /* disable dynamic PS when requested by the firmware */
 215         if (vector & SOFT_GEMINI_SENSE_EVENT_ID &&
 216             wl->bss_type == BSS_TYPE_STA_BSS) {
 217                 if (mbox->soft_gemini_sense_info)
 218                         ieee80211_disable_dyn_ps(wl->vif);
 219                 else
 220                         ieee80211_enable_dyn_ps(wl->vif);
 221         }
 222
 223         /*
 224          * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
 225          * filtering) is enabled. Without PSM, the stack will receive all
 226          * beacons and can detect beacon loss by itself.
 227          *
 228          * As there's possibility that the driver disables PSM before receiving
 229          * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
 230          *
 231          */
 232         if ((vector & BSS_LOSE_EVENT_ID) && !is_ap) {
 233                 wl1271_info("Beacon loss detected.");
 234
 235                 /* indicate to the stack, that beacons have been lost */
 236                 beacon_loss = true;
 237         }
 238
 239         if ((vector & PS_REPORT_EVENT_ID) && !is_ap) {
 240                 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
 241                 ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
 242                 if (ret < 0)
 243                         return ret;
 244         }
 245
 246         if ((vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID) && !is_ap)
 247                 wl1271_event_pspoll_delivery_fail(wl);
 248
 249         if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
 250                 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
 251                 if (wl->vif)
 252                         wl1271_event_rssi_trigger(wl, mbox);
 253         }
 254
 255         if ((vector & DUMMY_PACKET_EVENT_ID) && !is_ap) {
 256                 wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID");
 257                 if (wl->vif)
 258                         wl1271_tx_dummy_packet(wl);
 259         }
 260
 261         if (wl->vif && beacon_loss)
 262                 ieee80211_connection_loss(wl->vif);
 263
 264         return 0;
 265 }
 266
 267 int wl1271_event_unmask(struct wl1271 *wl)
 268 {
 269         int ret;
 270
 271         ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
 272         if (ret < 0)
 273                 return ret;
 274
 275         return 0;
 276 }
 277
 278 void wl1271_event_mbox_config(struct wl1271 *wl)
 279 {
 280         wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
 281         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 282
 283         wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 284                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 285 }
 286
 287 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
 288 {
 289         struct event_mailbox mbox;
 290         int ret;
 291
 292         wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 293
 294         if (mbox_num > 1)
 295                 return -EINVAL;
 296
 297         /* first we read the mbox descriptor */
 298         wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 299                     sizeof(struct event_mailbox), false);
 300
 301         /* process the descriptor */
 302         ret = wl1271_event_process(wl, &mbox);
 303         if (ret < 0)
 304                 return ret;
 305
 306         /* then we let the firmware know it can go on...*/
 307         wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 308
 309         return 0;
 310 }