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/*
* This file is part of wl1271
*
* Copyright (C) 2008-2009 Nokia Corporation
*
* Contact: Luciano Coelho <luciano.coelho@nokia.com>
*
* 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;
}
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