/* * This file is part of wl1271 * * Copyright (C) 2008-2009 Nokia Corporation * * Contact: Luciano Coelho * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * */ #include "wl12xx.h" #include "reg.h" #include "io.h" #include "event.h" #include "ps.h" #include "scan.h" #include "wl12xx_80211.h" void wl1271_pspoll_work(struct work_struct *work) { struct delayed_work *dwork; struct wl1271 *wl; int ret; dwork = container_of(work, struct delayed_work, work); wl = container_of(dwork, struct wl1271, pspoll_work); wl1271_debug(DEBUG_EVENT, "pspoll work"); mutex_lock(&wl->mutex); if (unlikely(wl->state == WL1271_STATE_OFF)) goto out; if (!test_and_clear_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags)) goto out; if (!test_bit(WL1271_FLAG_STA_ASSOCIATED, &wl->flags)) goto out; /* * if we end up here, then we were in powersave when the pspoll * delivery failure occurred, and no-one changed state since, so * we should go back to powersave. */ ret = wl1271_ps_elp_wakeup(wl); if (ret < 0) goto out; wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true); wl1271_ps_elp_sleep(wl); out: mutex_unlock(&wl->mutex); }; static void wl1271_event_pspoll_delivery_fail(struct wl1271 *wl) { int delay = wl->conf.conn.ps_poll_recovery_period; int ret; wl->ps_poll_failures++; if (wl->ps_poll_failures == 1) wl1271_info("AP with dysfunctional ps-poll, " "trying to work around it."); /* force active mode receive data from the AP */ if (test_bit(WL1271_FLAG_PSM, &wl->flags)) { ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE, wl->basic_rate, true); if (ret < 0) return; set_bit(WL1271_FLAG_PSPOLL_FAILURE, &wl->flags); ieee80211_queue_delayed_work(wl->hw, &wl->pspoll_work, msecs_to_jiffies(delay)); } /* * If already in active mode, lets we should be getting data from * the AP right away. If we enter PSM too fast after this, and data * remains on the AP, we will get another event like this, and we'll * go into active once more. */ } static int wl1271_event_ps_report(struct wl1271 *wl, struct event_mailbox *mbox, bool *beacon_loss) { int ret = 0; u32 total_retries = wl->conf.conn.psm_entry_retries; wl1271_debug(DEBUG_EVENT, "ps_status: 0x%x", mbox->ps_status); switch (mbox->ps_status) { case EVENT_ENTER_POWER_SAVE_FAIL: wl1271_debug(DEBUG_PSM, "PSM entry failed"); if (!test_bit(WL1271_FLAG_PSM, &wl->flags)) { /* remain in active mode */ wl->psm_entry_retry = 0; break; } if (wl->psm_entry_retry < total_retries) { wl->psm_entry_retry++; ret = wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true); } else { wl1271_info("No ack to nullfunc from AP."); wl->psm_entry_retry = 0; *beacon_loss = true; } break; case EVENT_ENTER_POWER_SAVE_SUCCESS: wl->psm_entry_retry = 0; /* enable beacon filtering */ ret = wl1271_acx_beacon_filter_opt(wl, true); if (ret < 0) break; /* enable beacon early termination */ ret = wl1271_acx_bet_enable(wl, true); break; default: break; } return ret; } static void wl1271_event_rssi_trigger(struct wl1271 *wl, struct event_mailbox *mbox) { enum nl80211_cqm_rssi_threshold_event event; s8 metric = mbox->rssi_snr_trigger_metric[0]; wl1271_debug(DEBUG_EVENT, "RSSI trigger metric: %d", metric); if (metric <= wl->rssi_thold) event = NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW; else event = NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH; if (event != wl->last_rssi_event) ieee80211_cqm_rssi_notify(wl->vif, event, GFP_KERNEL); wl->last_rssi_event = event; } static void wl1271_event_mbox_dump(struct event_mailbox *mbox) { wl1271_debug(DEBUG_EVENT, "MBOX DUMP:"); wl1271_debug(DEBUG_EVENT, "\tvector: 0x%x", mbox->events_vector); wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask); } static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox) { int ret; u32 vector; bool beacon_loss = false; bool is_ap = (wl->bss_type == BSS_TYPE_AP_BSS); bool disconnect_sta = false; unsigned long sta_bitmap = 0; wl1271_event_mbox_dump(mbox); vector = le32_to_cpu(mbox->events_vector); vector &= ~(le32_to_cpu(mbox->events_mask)); wl1271_debug(DEBUG_EVENT, "vector: 0x%x", vector); if (vector & SCAN_COMPLETE_EVENT_ID) { wl1271_debug(DEBUG_EVENT, "status: 0x%x", mbox->scheduled_scan_status); wl1271_scan_stm(wl); } /* disable dynamic PS when requested by the firmware */ if (vector & SOFT_GEMINI_SENSE_EVENT_ID && wl->bss_type == BSS_TYPE_STA_BSS) { if (mbox->soft_gemini_sense_info) ieee80211_disable_dyn_ps(wl->vif); else ieee80211_enable_dyn_ps(wl->vif); } /* * The BSS_LOSE_EVENT_ID is only needed while psm (and hence beacon * filtering) is enabled. Without PSM, the stack will receive all * beacons and can detect beacon loss by itself. * * As there's possibility that the driver disables PSM before receiving * BSS_LOSE_EVENT, beacon loss has to be reported to the stack. * */ if ((vector & BSS_LOSE_EVENT_ID) && !is_ap) { wl1271_info("Beacon loss detected."); /* indicate to the stack, that beacons have been lost */ beacon_loss = true; } if ((vector & PS_REPORT_EVENT_ID) && !is_ap) { wl1271_debug(DEBUG_EVENT, "PS_REPORT_EVENT"); ret = wl1271_event_ps_report(wl, mbox, &beacon_loss); if (ret < 0) return ret; } if ((vector & PSPOLL_DELIVERY_FAILURE_EVENT_ID) && !is_ap) wl1271_event_pspoll_delivery_fail(wl); if (vector & RSSI_SNR_TRIGGER_0_EVENT_ID) { wl1271_debug(DEBUG_EVENT, "RSSI_SNR_TRIGGER_0_EVENT"); if (wl->vif) wl1271_event_rssi_trigger(wl, mbox); } if ((vector & DUMMY_PACKET_EVENT_ID) && !is_ap) { wl1271_debug(DEBUG_EVENT, "DUMMY_PACKET_ID_EVENT_ID"); if (wl->vif) wl1271_tx_dummy_packet(wl); } /* * "TX retries exceeded" has a different meaning according to mode. * In AP mode the offending station is disconnected. In STA mode we * report connection loss. */ if (vector & MAX_TX_RETRY_EVENT_ID) { wl1271_debug(DEBUG_EVENT, "MAX_TX_RETRY_EVENT_ID"); if (is_ap) { sta_bitmap |= le16_to_cpu(mbox->sta_tx_retry_exceeded); disconnect_sta = true; } else { beacon_loss = true; } } if ((vector & INACTIVE_STA_EVENT_ID) && is_ap) { wl1271_debug(DEBUG_EVENT, "INACTIVE_STA_EVENT_ID"); sta_bitmap |= le16_to_cpu(mbox->sta_aging_status); disconnect_sta = true; } if (wl->vif && beacon_loss) ieee80211_connection_loss(wl->vif); if (is_ap && disconnect_sta) { u32 num_packets = wl->conf.tx.max_tx_retries; struct ieee80211_sta *sta; const u8 *addr; int h; for (h = find_first_bit(&sta_bitmap, AP_MAX_LINKS); h < AP_MAX_LINKS; h = find_next_bit(&sta_bitmap, AP_MAX_LINKS, h+1)) { if (!wl1271_is_active_sta(wl, h)) continue; addr = wl->links[h].addr; rcu_read_lock(); sta = ieee80211_find_sta(wl->vif, addr); if (sta) { wl1271_debug(DEBUG_EVENT, "remove sta %d", h); ieee80211_report_low_ack(sta, num_packets); } rcu_read_unlock(); } } return 0; } int wl1271_event_unmask(struct wl1271 *wl) { int ret; ret = wl1271_acx_event_mbox_mask(wl, ~(wl->event_mask)); if (ret < 0) return ret; return 0; } void wl1271_event_mbox_config(struct wl1271 *wl) { wl->mbox_ptr[0] = wl1271_read32(wl, REG_EVENT_MAILBOX_PTR); wl->mbox_ptr[1] = wl->mbox_ptr[0] + sizeof(struct event_mailbox); wl1271_debug(DEBUG_EVENT, "MBOX ptrs: 0x%x 0x%x", wl->mbox_ptr[0], wl->mbox_ptr[1]); } int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num) { struct event_mailbox mbox; int ret; wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num); if (mbox_num > 1) return -EINVAL; /* first we read the mbox descriptor */ wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox, sizeof(struct event_mailbox), false); /* process the descriptor */ ret = wl1271_event_process(wl, &mbox); if (ret < 0) return ret; /* then we let the firmware know it can go on...*/ wl1271_write32(wl, ACX_REG_INTERRUPT_TRIG, INTR_TRIG_EVENT_ACK); return 0; }