Pileus Git - ~andy/linux/blob - 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 "wl12xx_80211.h"
  30
  31 static int wl1271_event_scan_complete(struct wl1271 *wl,
  32                                       struct event_mailbox *mbox)
  33 {
  34         wl1271_debug(DEBUG_EVENT, "status: 0x%x",
  35                      mbox->scheduled_scan_status);
  36
  37         if (test_bit(WL1271_FLAG_SCANNING, &wl->flags)) {
  38                 if (wl->scan.state == WL1271_SCAN_BAND_DUAL) {
  39                         /* 2.4 GHz band scanned, scan 5 GHz band, pretend
  40                          * to the wl1271_cmd_scan function that we are not
  41                          * scanning as it checks that.
  42                          */
  43                         clear_bit(WL1271_FLAG_SCANNING, &wl->flags);
  44                         /* FIXME: ie missing! */
  45                         wl1271_cmd_scan(wl, wl->scan.ssid, wl->scan.ssid_len,
  46                                                 NULL, 0,
  47                                                 wl->scan.active,
  48                                                 wl->scan.high_prio,
  49                                                 WL1271_SCAN_BAND_5_GHZ,
  50                                                 wl->scan.probe_requests);
  51                 } else {
  52                         mutex_unlock(&wl->mutex);
  53                         ieee80211_scan_completed(wl->hw, false);
  54                         mutex_lock(&wl->mutex);
  55                         clear_bit(WL1271_FLAG_SCANNING, &wl->flags);
  56                 }
  57         }
  58         return 0;
  59 }
  60
  61 static int wl1271_event_ps_report(struct wl1271 *wl,
  62                                   struct event_mailbox *mbox,
  63                                   bool *beacon_loss)
  64 {
  65         int ret = 0;
  66
  67         wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status);
  68
  69         switch (mbox->ps_status) {
  70         case EVENT_ENTER_POWER_SAVE_FAIL:
  71                 wl1271_debug(DEBUG_PSM, "PSM entry failed");
  72
  73                 if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) {
  74                         /* remain in active mode */
  75                         wl->psm_entry_retry = 0;
  76                         break;
  77                 }
  78
  79                 if (wl->psm_entry_retry < wl->conf.conn.psm_entry_retries) {
  80                         wl->psm_entry_retry++;
  81                         ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE,
  82                                                  true);
  83                 } else {
  84                         wl1271_info("No ack to nullfunc from AP.");
  85                         wl->psm_entry_retry = 0;
  86                         *beacon_loss = true;
  87                 }
  88                 break;
  89         case EVENT_ENTER_POWER_SAVE_SUCCESS:
  90                 wl->psm_entry_retry = 0;
  91
  92                 /* enable beacon filtering */
  93                 ret = wl1271_acx_beacon_filter_opt(wl, true);
  94                 if (ret < 0)
  95                         break;
  96
  97                 /* enable beacon early termination */
  98                 ret = wl1271_acx_bet_enable(wl, true);
  99                 if (ret < 0)
 100                         break;
 101
 102                 /* go to extremely low power mode */
 103                 wl1271_ps_elp_sleep(wl);
 104                 if (ret < 0)
 105                         break;
 106                 break;
 107         case EVENT_EXIT_POWER_SAVE_FAIL:
 108                 wl1271_debug(DEBUG_PSM, "PSM exit failed");
 109
 110                 if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
 111                         wl->psm_entry_retry = 0;
 112                         break;
 113                 }
 114
 115                 /* make sure the firmware goes to active mode - the frame to
 116                    be sent next will indicate to the AP, that we are active. */
 117                 ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
 118                                          false);
 119                 break;
 120         case EVENT_EXIT_POWER_SAVE_SUCCESS:
 121         default:
 122                 break;
 123         }
 124
 125         return ret;
 126 }
 127
 128 static void wl1271_event_rssi_trigger(struct wl1271 *wl,
 129                                       struct event_mailbox *mbox)
 130 {
 131         enum nl80211_cqm_rssi_threshold_event event;
 132         s8 metric = mbox->rssi_snr_trigger_metric[0];
 133
 134         wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric);
 135
 136         if (metric <= wl->rssi_thold)
 137                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW;
 138         else
 139                 event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH;
 140
 141         if (event != wl->last_rssi_event)
 142                 ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL);
 143         wl->last_rssi_event = event;
 144 }
 145
 146 static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
 147 {
 148         wl1271_debug(DEBUG_EVENT, "MBOX DUMP:");
 149         wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
 150         wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
 151 }
 152
 153 static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
 154 {
 155         int ret;
 156         u32 vector;
 157         bool beacon_loss = false;
 158
 159         wl1271_event_mbox_dump(mbox);
 160
 161         vector = le32_to_cpu(mbox->events_vector);
 162         vector &= ~(le32_to_cpu(mbox->events_mask));
 163         wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector);
 164
 165         if (vector & SCAN_COMPLETE_EVENT_ID) {
 166                 ret = wl1271_event_scan_complete(wl, mbox);
 167                 if (ret < 0)
 168                         return ret;
 169         }
 170
 171         /*
 172          * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon
 173          * filtering) is enabled. Without PSM, the stack will receive all
 174          * beacons and can detect beacon loss by itself.
 175          *
 176          * As there's possibility that the driver disables PSM before receiving
 177          * BSS_LOSE_EVENT, beacon loss has to be reported to the stack.
 178          *
 179          */
 180         if (vector & BSS_LOSE_EVENT_ID) {
 181                 wl1271_info("Beacon loss detected.");
 182
 183                 /* indicate to the stack, that beacons have been lost */
 184                 beacon_loss = true;
 185         }
 186
 187         if (vector & PS_REPORT_EVENT_ID) {
 188                 wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT");
 189                 ret = wl1271_event_ps_report(wl, mbox, &beacon_loss);
 190                 if (ret < 0)
 191                         return ret;
 192         }
 193
 194         if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) {
 195                 wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT");
 196                 if (wl->vif)
 197                         wl1271_event_rssi_trigger(wl, mbox);
 198         }
 199
 200         if (wl->vif && beacon_loss)
 201                 ieee80211_connection_loss(wl->vif);
 202
 203         return 0;
 204 }
 205
 206 int wl1271_event_unmask(struct wl1271 *wl)
 207 {
 208         int ret;
 209
 210         ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask));
 211         if (ret < 0)
 212                 return ret;
 213
 214         return 0;
 215 }
 216
 217 void wl1271_event_mbox_config(struct wl1271 *wl)
 218 {
 219         wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR);
 220         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 221
 222         wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 223                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 224 }
 225
 226 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
 227 {
 228         struct event_mailbox mbox;
 229         int ret;
 230
 231         wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 232
 233         if (mbox_num > 1)
 234                 return -EINVAL;
 235
 236         /* first we read the mbox descriptor */
 237         wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 238                     sizeof(struct event_mailbox), false);
 239
 240         /* process the descriptor */
 241         ret = wl1271_event_process(wl, &mbox);
 242         if (ret < 0)
 243                 return ret;
 244
 245         /* then we let the firmware know it can go on...*/
 246         wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 247
 248         return 0;
 249 }