drivers/net/wireless/wl1251/event.c

   1 /*
   2  * This file is part of wl1251
   3  *
   4  * Copyright (c) 1998-2007 Texas Instruments Incorporated
   5  * Copyright (C) 2008 Nokia Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  19  * 02110-1301 USA
  20  *
  21  */
  22
  23 #include "wl1251.h"
  24 #include "reg.h"
  25 #include "io.h"
  26 #include "event.h"
  27 #include "ps.h"
  28
  29 static int wl1251_event_scan_complete(struct wl1251 *wl,
  30                                       struct event_mailbox *mbox)
  31 {
  32         wl1251_debug(DEBUG_EVENT, "status: 0x%x, channels: %d",
  33                      mbox->scheduled_scan_status,
  34                      mbox->scheduled_scan_channels);
  35
  36         if (wl->scanning) {
  37                 ieee80211_scan_completed(wl->hw, false);
  38                 wl1251_debug(DEBUG_MAC80211, "mac80211 hw scan completed");
  39                 wl->scanning = false;
  40         }
  41
  42         return 0;
  43 }
  44
  45 static void wl1251_event_mbox_dump(struct event_mailbox *mbox)
  46 {
  47         wl1251_debug(DEBUG_EVENT, "MBOX DUMP:");
  48         wl1251_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector);
  49         wl1251_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
  50 }
  51
  52 static int wl1251_event_process(struct wl1251 *wl, struct event_mailbox *mbox)
  53 {
  54         int ret;
  55         u32 vector;
  56
  57         wl1251_event_mbox_dump(mbox);
  58
  59         vector = mbox->events_vector & ~(mbox->events_mask);
  60         wl1251_debug(DEBUG_EVENT, "vector: 0x%x", vector);
  61
  62         if (vector & SCAN_COMPLETE_EVENT_ID) {
  63                 ret = wl1251_event_scan_complete(wl, mbox);
  64                 if (ret < 0)
  65                         return ret;
  66         }
  67
  68         if (vector & BSS_LOSE_EVENT_ID) {
  69                 wl1251_debug(DEBUG_EVENT, "BSS_LOSE_EVENT");
  70
  71                 if (wl->psm_requested && wl->psm) {
  72                         ret = wl1251_ps_set_mode(wl, STATION_ACTIVE_MODE);
  73                         if (ret < 0)
  74                                 return ret;
  75                 }
  76         }
  77
  78         if (vector & SYNCHRONIZATION_TIMEOUT_EVENT_ID && wl->psm) {
  79                 wl1251_debug(DEBUG_EVENT, "SYNCHRONIZATION_TIMEOUT_EVENT");
  80
  81                 /* indicate to the stack, that beacons have been lost */
  82                 ieee80211_beacon_loss(wl->vif);
  83         }
  84
  85         if (vector & REGAINED_BSS_EVENT_ID) {
  86                 if (wl->psm_requested) {
  87                         ret = wl1251_ps_set_mode(wl, STATION_POWER_SAVE_MODE);
  88                         if (ret < 0)
  89                                 return ret;
  90                 }
  91         }
  92
  93         if (wl->vif && wl->rssi_thold) {
  94                 if (vector & ROAMING_TRIGGER_LOW_RSSI_EVENT_ID) {
  95                         wl1251_debug(DEBUG_EVENT,
  96                                      "ROAMING_TRIGGER_LOW_RSSI_EVENT");
  97                         ieee80211_cqm_rssi_notify(wl->vif,
  98                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
  99                                 GFP_KERNEL);
 100                 }
 101
 102                 if (vector & ROAMING_TRIGGER_REGAINED_RSSI_EVENT_ID) {
 103                         wl1251_debug(DEBUG_EVENT,
 104                                      "ROAMING_TRIGGER_REGAINED_RSSI_EVENT");
 105                         ieee80211_cqm_rssi_notify(wl->vif,
 106                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
 107                                 GFP_KERNEL);
 108                 }
 109         }
 110
 111         return 0;
 112 }
 113
 114 /*
 115  * Poll the mailbox event field until any of the bits in the mask is set or a
 116  * timeout occurs (WL1251_EVENT_TIMEOUT in msecs)
 117  */
 118 int wl1251_event_wait(struct wl1251 *wl, u32 mask, int timeout_ms)
 119 {
 120         u32 events_vector, event;
 121         unsigned long timeout;
 122
 123         timeout = jiffies + msecs_to_jiffies(timeout_ms);
 124
 125         do {
 126                 if (time_after(jiffies, timeout))
 127                         return -ETIMEDOUT;
 128
 129                 msleep(1);
 130
 131                 /* read from both event fields */
 132                 wl1251_mem_read(wl, wl->mbox_ptr[0], &events_vector,
 133                                 sizeof(events_vector));
 134                 event = events_vector & mask;
 135                 wl1251_mem_read(wl, wl->mbox_ptr[1], &events_vector,
 136                                 sizeof(events_vector));
 137                 event |= events_vector & mask;
 138         } while (!event);
 139
 140         return 0;
 141 }
 142
 143 int wl1251_event_unmask(struct wl1251 *wl)
 144 {
 145         int ret;
 146
 147         ret = wl1251_acx_event_mbox_mask(wl, ~(wl->event_mask));
 148         if (ret < 0)
 149                 return ret;
 150
 151         return 0;
 152 }
 153
 154 void wl1251_event_mbox_config(struct wl1251 *wl)
 155 {
 156         wl->mbox_ptr[0] = wl1251_reg_read32(wl, REG_EVENT_MAILBOX_PTR);
 157         wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox);
 158
 159         wl1251_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x",
 160                      wl->mbox_ptr[0], wl->mbox_ptr[1]);
 161 }
 162
 163 int wl1251_event_handle(struct wl1251 *wl, u8 mbox_num)
 164 {
 165         struct event_mailbox mbox;
 166         int ret;
 167
 168         wl1251_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
 169
 170         if (mbox_num > 1)
 171                 return -EINVAL;
 172
 173         /* first we read the mbox descriptor */
 174         wl1251_mem_read(wl, wl->mbox_ptr[mbox_num], &mbox,
 175                             sizeof(struct event_mailbox));
 176
 177         /* process the descriptor */
 178         ret = wl1251_event_process(wl, &mbox);
 179         if (ret < 0)
 180                 return ret;
 181
 182         /* then we let the firmware know it can go on...*/
 183         wl1251_reg_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK);
 184
 185         return 0;
 186 }