drivers/net/wireless/wl12xx/event.c - linux - Git at Google

 /*
  * 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;

 	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.
 	 */
 	wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true);

 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);
 		if (ret < 0)
 			break;

 		/* go to extremely low power mode */
 		wl1271_ps_elp_sleep(wl);
 		break;
 	case EVENT_EXIT_POWER_SAVE_FAIL:
 		wl1271_debug(DEBUG_PSM, "PSM exit failed");

 		if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
 			wl->psm_entry_retry = 0;
 			break;
 		}

 		/* make sure the firmware goes to active mode - the frame to
 		   be sent next will indicate to the AP, that we are active. */
 		ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
 					 wl->basic_rate, false);
 		break;
 	case EVENT_EXIT_POWER_SAVE_SUCCESS:
 	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;

 	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) {
 		wl1271_info("Beacon loss detected.");

 		/* indicate to the stack, that beacons have been lost */
 		beacon_loss = true;
 	}

 	if (vector & PS_REPORT_EVENT_ID) {
 		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)
 		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 (wl->vif && beacon_loss)
 		ieee80211_connection_loss(wl->vif);

 	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;
 }
	/*
	* 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;

	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.
	*/
	wl1271_ps_set_mode(wl, STATION_POWER_SAVE_MODE, wl->basic_rate, true);

	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);
	if (ret < 0)
	break;

	/* go to extremely low power mode */
	wl1271_ps_elp_sleep(wl);
	break;
	case EVENT_EXIT_POWER_SAVE_FAIL:
	wl1271_debug(DEBUG_PSM, "PSM exit failed");

	if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
	wl->psm_entry_retry = 0;
	break;
	}

	/* make sure the firmware goes to active mode - the frame to
	be sent next will indicate to the AP, that we are active. */
	ret = wl1271_ps_set_mode(wl, STATION_ACTIVE_MODE,
	wl->basic_rate, false);
	break;
	case EVENT_EXIT_POWER_SAVE_SUCCESS:
	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;

	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) {
	wl1271_info("Beacon loss detected.");

	/* indicate to the stack, that beacons have been lost */
	beacon_loss = true;
	}

	if (vector & PS_REPORT_EVENT_ID) {
	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)
	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 (wl->vif && beacon_loss)
	ieee80211_connection_loss(wl->vif);

	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;
	}