ps.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright( c ) 2009-2012  Realtek Corporation.*/

#include "wifi.h"
#include "base.h"
#include "ps.h"
#include <linux/export.h>
#include "btcoexist/rtl_btc.h"

bool rtl_ps_enable_nic( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );
	struct rtl_hal *rtlhal = rtl_hal( rtl_priv( hw ) );
	struct rtl_mac *rtlmac = rtl_mac( rtl_priv( hw ) );

	/*<1> reset trx ring */
	if ( rtlhal->interface == INTF_PCI )
		rtlpriv->intf_ops->reset_trx_ring( hw );

	if ( is_hal_stop( rtlhal ) )
		RT_TRACE( rtlpriv, COMP_ERR, DBG_WARNING,
			 "Driver is already down!\n" );

	/*<2> Enable Adapter */
	if ( rtlpriv->cfg->ops->hw_init( hw ) )
		return false;
	rtlpriv->cfg->ops->set_hw_reg( hw, HW_VAR_RETRY_LIMIT,
			&rtlmac->retry_long );
	RT_CLEAR_PS_LEVEL( ppsc, RT_RF_OFF_LEVL_HALT_NIC );

	rtlpriv->cfg->ops->switch_channel( hw );
	rtlpriv->cfg->ops->set_channel_access( hw );
	rtlpriv->cfg->ops->set_bw_mode( hw,
			cfg80211_get_chandef_type( &hw->conf.chandef ) );

	/*<3> Enable Interrupt */
	rtlpriv->cfg->ops->enable_interrupt( hw );

	/*<enable timer> */
	rtl_watch_dog_timer_callback( &rtlpriv->works.watchdog_timer );

	return true;
}
EXPORT_SYMBOL( rtl_ps_enable_nic );

bool rtl_ps_disable_nic( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );

	/*<1> Stop all timer */
	rtl_deinit_deferred_work( hw, true );

	/*<2> Disable Interrupt */
	rtlpriv->cfg->ops->disable_interrupt( hw );
	tasklet_kill( &rtlpriv->works.irq_tasklet );

	/*<3> Disable Adapter */
	rtlpriv->cfg->ops->hw_disable( hw );

	return true;
}
EXPORT_SYMBOL( rtl_ps_disable_nic );

static bool rtl_ps_set_rf_state( struct ieee80211_hw *hw,
				enum rf_pwrstate state_toset,
				u32 changesource )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );
	bool actionallowed = false;
	u16 rfwait_cnt = 0;

	/*Only one thread can change
	 *the RF state at one time, and others
	 *should wait to be executed.
	 */
	while ( true ) {
		spin_lock( &rtlpriv->locks.rf_ps_lock );
		if ( ppsc->rfchange_inprogress ) {
			spin_unlock( &rtlpriv->locks.rf_ps_lock );

			RT_TRACE( rtlpriv, COMP_ERR, DBG_WARNING,
				 "RF Change in progress! Wait to set..state_toset(%d).\n",
				  state_toset );

			/* Set RF after the previous action is done.  */
			while ( ppsc->rfchange_inprogress ) {
				rfwait_cnt++;
				mdelay( 1 );
				/*Wait too long, return false to avoid
				 *to be stuck here.
				 */
				if ( rfwait_cnt > 100 )
					return false;
			}
		} else {
			ppsc->rfchange_inprogress = true;
			spin_unlock( &rtlpriv->locks.rf_ps_lock );
			break;
		}
	}

	switch ( state_toset ) {
	case ERFON:
		ppsc->rfoff_reason &= ( ~changesource );

		if ( ( changesource == RF_CHANGE_BY_HW ) &&
		    ( ppsc->hwradiooff ) ) {
			ppsc->hwradiooff = false;
		}

		if ( !ppsc->rfoff_reason ) {
			ppsc->rfoff_reason = 0;
			actionallowed = true;
		}

		break;

	case ERFOFF:

		if ( ( changesource == RF_CHANGE_BY_HW ) && !ppsc->hwradiooff ) {
			ppsc->hwradiooff = true;
		}

		ppsc->rfoff_reason |= changesource;
		actionallowed = true;
		break;

	case ERFSLEEP:
		ppsc->rfoff_reason |= changesource;
		actionallowed = true;
		break;

	default:
		pr_err( "switch case %#x not processed\n", state_toset );
		break;
	}

	if ( actionallowed )
		rtlpriv->cfg->ops->set_rf_power_state( hw, state_toset );

	spin_lock( &rtlpriv->locks.rf_ps_lock );
	ppsc->rfchange_inprogress = false;
	spin_unlock( &rtlpriv->locks.rf_ps_lock );

	return actionallowed;
}

static void _rtl_ps_inactive_ps( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_hal *rtlhal = rtl_hal( rtl_priv( hw ) );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );

	ppsc->swrf_processing = true;

	if ( ppsc->inactive_pwrstate == ERFON &&
	    rtlhal->interface == INTF_PCI ) {
		if ( ( ppsc->reg_rfps_level & RT_RF_OFF_LEVL_ASPM ) &&
		    RT_IN_PS_LEVEL( ppsc, RT_PS_LEVEL_ASPM ) ) {
			rtlpriv->intf_ops->disable_aspm( hw );
			RT_CLEAR_PS_LEVEL( ppsc, RT_PS_LEVEL_ASPM );
		}
	}

	rtl_ps_set_rf_state( hw, ppsc->inactive_pwrstate,
			    RF_CHANGE_BY_IPS );

	if ( ppsc->inactive_pwrstate == ERFOFF &&
	    rtlhal->interface == INTF_PCI ) {
		if ( ppsc->reg_rfps_level & RT_RF_OFF_LEVL_ASPM &&
		    !RT_IN_PS_LEVEL( ppsc, RT_PS_LEVEL_ASPM ) ) {
			rtlpriv->intf_ops->enable_aspm( hw );
			RT_SET_PS_LEVEL( ppsc, RT_PS_LEVEL_ASPM );
		}
	}

	ppsc->swrf_processing = false;
}

void rtl_ips_nic_off_wq_callback( void *data )
{
	struct rtl_works *rtlworks =
	    container_of_dwork_rtl( data, struct rtl_works, ips_nic_off_wq );
	struct ieee80211_hw *hw = rtlworks->hw;
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_hal *rtlhal = rtl_hal( rtl_priv( hw ) );
	struct rtl_mac *mac = rtl_mac( rtl_priv( hw ) );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );
	enum rf_pwrstate rtstate;

	if ( mac->opmode != NL80211_IFTYPE_STATION ) {
		RT_TRACE( rtlpriv, COMP_ERR, DBG_WARNING,
			 "not station return\n" );
		return;
	}

	if ( mac->p2p_in_use )
		return;

	if ( mac->link_state > MAC80211_NOLINK )
		return;

	if ( is_hal_stop( rtlhal ) )
		return;

	if ( rtlpriv->sec.being_setkey )
		return;

	if ( rtlpriv->cfg->ops->bt_coex_off_before_lps )
		rtlpriv->cfg->ops->bt_coex_off_before_lps( hw );

	if ( ppsc->inactiveps ) {
		rtstate = ppsc->rfpwr_state;

		/*
		 *Do not enter IPS in the following conditions:
		 *( 1 ) RF is already OFF or Sleep
		 *( 2 ) swrf_processing ( indicates the IPS is still under going )
		 *( 3 ) Connectted ( only disconnected can trigger IPS )
		 *( 4 ) IBSS ( send Beacon )
		 *( 5 ) AP mode ( send Beacon )
		 *( 6 ) monitor mode ( rcv packet )
		 */

		if ( rtstate == ERFON &&
		    !ppsc->swrf_processing &&
		    ( mac->link_state == MAC80211_NOLINK ) &&
		    !mac->act_scanning ) {
			RT_TRACE( rtlpriv, COMP_RF, DBG_TRACE,
				 "IPSEnter(): Turn off RF\n" );

			ppsc->inactive_pwrstate = ERFOFF;
			ppsc->in_powersavemode = true;

			/* call before RF off */
			if ( rtlpriv->cfg->ops->get_btc_status() )
				rtlpriv->btcoexist.btc_ops->btc_ips_notify( rtlpriv,
									ppsc->inactive_pwrstate );

			/*rtl_pci_reset_trx_ring( hw ); */
			_rtl_ps_inactive_ps( hw );
		}
	}
}

void rtl_ips_nic_off( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );

	/* because when link with ap, mac80211 will ask us
	 * to disable nic quickly after scan before linking,
	 * this will cause link failed, so we delay 100ms here
	 */
	queue_delayed_work( rtlpriv->works.rtl_wq,
			   &rtlpriv->works.ips_nic_off_wq, MSECS( 100 ) );
}

/* NOTICE: any opmode should exc nic_on, or disable without
 * nic_on may something wrong, like adhoc TP
 */
void rtl_ips_nic_on( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );
	enum rf_pwrstate rtstate;

	cancel_delayed_work_sync( &rtlpriv->works.ips_nic_off_wq );

	mutex_lock( &rtlpriv->locks.ips_mutex );
	if ( ppsc->inactiveps ) {
		rtstate = ppsc->rfpwr_state;

		if ( rtstate != ERFON &&
		    !ppsc->swrf_processing &&
		    ppsc->rfoff_reason <= RF_CHANGE_BY_IPS ) {

			ppsc->inactive_pwrstate = ERFON;
			ppsc->in_powersavemode = false;
			_rtl_ps_inactive_ps( hw );
			/* call after RF on */
			if ( rtlpriv->cfg->ops->get_btc_status() )
				rtlpriv->btcoexist.btc_ops->btc_ips_notify( rtlpriv,
									ppsc->inactive_pwrstate );
		}
	}
	mutex_unlock( &rtlpriv->locks.ips_mutex );
}
EXPORT_SYMBOL_GPL( rtl_ips_nic_on );

/*for FW LPS*/

/*
 *Determine if we can set Fw into PS mode
 *in current condition.Return TRUE if it
 *can enter PS mode.
 */
static bool rtl_get_fwlps_doze( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_mac *mac = rtl_mac( rtl_priv( hw ) );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );
	u32 ps_timediff;

	ps_timediff = jiffies_to_msecs( jiffies -
				       ppsc->last_delaylps_stamp_jiffies );

	if ( ps_timediff < 2000 ) {
		RT_TRACE( rtlpriv, COMP_POWER, DBG_LOUD,
			 "Delay enter Fw LPS for DHCP, ARP, or EAPOL exchanging state\n" );
		return false;
	}

	if ( mac->link_state != MAC80211_LINKED )
		return false;

	if ( mac->opmode == NL80211_IFTYPE_ADHOC )
		return false;

	return true;
}

/* Change current and default preamble mode.*/
void rtl_lps_set_psmode( struct ieee80211_hw *hw, u8 rt_psmode )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_mac *mac = rtl_mac( rtl_priv( hw ) );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );
	bool enter_fwlps;

	if ( mac->opmode == NL80211_IFTYPE_ADHOC )
		return;

	if ( mac->link_state != MAC80211_LINKED )
		return;

	if ( ppsc->dot11_psmode == rt_psmode && rt_psmode == EACTIVE )
		return;

	/* Update power save mode configured. */
	ppsc->dot11_psmode = rt_psmode;

	/*
	 *<FW control LPS>
	 *1. Enter PS mode
	 *   Set RPWM to Fw to turn RF off and send H2C fw_pwrmode
	 *   cmd to set Fw into PS mode.
	 *2. Leave PS mode
	 *   Send H2C fw_pwrmode cmd to Fw to set Fw into Active
	 *   mode and set RPWM to turn RF on.
	 */

	if ( ( ppsc->fwctrl_lps ) && ppsc->report_linked ) {
		if ( ppsc->dot11_psmode == EACTIVE ) {
			RT_TRACE( rtlpriv, COMP_RF, DBG_DMESG,
				 "FW LPS leave ps_mode:%x\n",
				  FW_PS_ACTIVE_MODE );
			enter_fwlps = false;
			ppsc->pwr_mode = FW_PS_ACTIVE_MODE;
			ppsc->smart_ps = 0;
			rtlpriv->cfg->ops->set_hw_reg( hw, HW_VAR_FW_LPS_ACTION,
						      ( u8 * )( &enter_fwlps ) );
			if ( ppsc->p2p_ps_info.opp_ps )
				rtl_p2p_ps_cmd( hw , P2P_PS_ENABLE );

			if ( rtlpriv->cfg->ops->get_btc_status() )
				rtlpriv->btcoexist.btc_ops->btc_lps_notify( rtlpriv, rt_psmode );
		} else {
			if ( rtl_get_fwlps_doze( hw ) ) {
				RT_TRACE( rtlpriv, COMP_RF, DBG_DMESG,
					 "FW LPS enter ps_mode:%x\n",
					 ppsc->fwctrl_psmode );
				if ( rtlpriv->cfg->ops->get_btc_status() )
					rtlpriv->btcoexist.btc_ops->btc_lps_notify( rtlpriv, rt_psmode );
				enter_fwlps = true;
				ppsc->pwr_mode = ppsc->fwctrl_psmode;
				ppsc->smart_ps = 2;
				rtlpriv->cfg->ops->set_hw_reg( hw,
							HW_VAR_FW_LPS_ACTION,
							( u8 * )( &enter_fwlps ) );

			} else {
				/* Reset the power save related parameters. */
				ppsc->dot11_psmode = EACTIVE;
			}
		}
	}
}

/* Interrupt safe routine to enter the leisure power save mode.*/
static void rtl_lps_enter_core( struct ieee80211_hw *hw )
{
	struct rtl_mac *mac = rtl_mac( rtl_priv( hw ) );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );
	struct rtl_priv *rtlpriv = rtl_priv( hw );

	if ( !ppsc->fwctrl_lps )
		return;

	if ( rtlpriv->sec.being_setkey )
		return;

	if ( rtlpriv->link_info.busytraffic )
		return;

	/*sleep after linked 10s, to let DHCP and 4-way handshake ok enough!! */
	if ( mac->cnt_after_linked < 5 )
		return;

	if ( mac->opmode == NL80211_IFTYPE_ADHOC )
		return;

	if ( mac->link_state != MAC80211_LINKED )
		return;

	mutex_lock( &rtlpriv->locks.lps_mutex );

	/* Don't need to check ( ppsc->dot11_psmode == EACTIVE ), because
	 * bt_ccoexist may ask to enter lps.
	 * In normal case, this constraint move to rtl_lps_set_psmode().
	 */
	RT_TRACE( rtlpriv, COMP_POWER, DBG_LOUD,
		 "Enter 802.11 power save mode...\n" );
	rtl_lps_set_psmode( hw, EAUTOPS );

	mutex_unlock( &rtlpriv->locks.lps_mutex );
}

/* Interrupt safe routine to leave the leisure power save mode.*/
static void rtl_lps_leave_core( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );
	struct rtl_hal *rtlhal = rtl_hal( rtl_priv( hw ) );

	mutex_lock( &rtlpriv->locks.lps_mutex );

	if ( ppsc->fwctrl_lps ) {
		if ( ppsc->dot11_psmode != EACTIVE ) {

			/*FIX ME */
			/*rtlpriv->cfg->ops->enable_interrupt( hw ); */

			if ( ppsc->reg_rfps_level & RT_RF_LPS_LEVEL_ASPM &&
			    RT_IN_PS_LEVEL( ppsc, RT_PS_LEVEL_ASPM ) &&
			    rtlhal->interface == INTF_PCI ) {
				rtlpriv->intf_ops->disable_aspm( hw );
				RT_CLEAR_PS_LEVEL( ppsc, RT_PS_LEVEL_ASPM );
			}

			RT_TRACE( rtlpriv, COMP_POWER, DBG_LOUD,
				 "Busy Traffic,Leave 802.11 power save..\n" );

			rtl_lps_set_psmode( hw, EACTIVE );
		}
	}
	mutex_unlock( &rtlpriv->locks.lps_mutex );
}

/* For sw LPS*/
void rtl_swlps_beacon( struct ieee80211_hw *hw, void *data, unsigned int len )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_mac *mac = rtl_mac( rtl_priv( hw ) );
	struct ieee80211_hdr *hdr = data;
	struct ieee80211_tim_ie *tim_ie;
	u8 *tim;
	u8 tim_len;
	bool u_buffed;
	bool m_buffed;

	if ( mac->opmode != NL80211_IFTYPE_STATION )
		return;

	if ( !rtlpriv->psc.swctrl_lps )
		return;

	if ( rtlpriv->mac80211.link_state != MAC80211_LINKED )
		return;

	if ( !rtlpriv->psc.sw_ps_enabled )
		return;

	if ( rtlpriv->psc.fwctrl_lps )
		return;

	if ( likely( !( hw->conf.flags & IEEE80211_CONF_PS ) ) )
		return;

	/* check if this really is a beacon */
	if ( !ieee80211_is_beacon( hdr->frame_control ) )
		return;

	/* min. beacon length + FCS_LEN */
	if ( len <= 40 + FCS_LEN )
		return;

	/* and only beacons from the associated BSSID, please */
	if ( !ether_addr_equal_64bits( hdr->addr3, rtlpriv->mac80211.bssid ) )
		return;

	rtlpriv->psc.last_beacon = jiffies;

	tim = rtl_find_ie( data, len - FCS_LEN, WLAN_EID_TIM );
	if ( !tim )
		return;

	if ( tim[1] < sizeof( *tim_ie ) )
		return;

	tim_len = tim[1];
	tim_ie = ( struct ieee80211_tim_ie * ) &tim[2];

	if ( !WARN_ON_ONCE( !hw->conf.ps_dtim_period ) )
		rtlpriv->psc.dtim_counter = tim_ie->dtim_count;

	/* Check whenever the PHY can be turned off again. */

	/* 1. What about buffered unicast traffic for our AID? */
	u_buffed = ieee80211_check_tim( tim_ie, tim_len,
				       rtlpriv->mac80211.assoc_id );

	/* 2. Maybe the AP wants to send multicast/broadcast data? */
	m_buffed = tim_ie->bitmap_ctrl & 0x01;
	rtlpriv->psc.multi_buffered = m_buffed;

	/* unicast will process by mac80211 through
	 * set ~IEEE80211_CONF_PS, So we just check
	 * multicast frames here */
	if ( !m_buffed ) {
		/* back to low-power land. and delay is
		 * prevent null power save frame tx fail */
		queue_delayed_work( rtlpriv->works.rtl_wq,
				   &rtlpriv->works.ps_work, MSECS( 5 ) );
	} else {
		RT_TRACE( rtlpriv, COMP_POWER, DBG_DMESG,
			 "u_bufferd: %x, m_buffered: %x\n", u_buffed, m_buffed );
	}
}
EXPORT_SYMBOL_GPL( rtl_swlps_beacon );

void rtl_swlps_rf_awake( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );
	struct rtl_mac *mac = rtl_mac( rtl_priv( hw ) );

	if ( !rtlpriv->psc.swctrl_lps )
		return;
	if ( mac->link_state != MAC80211_LINKED )
		return;

	if ( ppsc->reg_rfps_level & RT_RF_LPS_LEVEL_ASPM &&
	    RT_IN_PS_LEVEL( ppsc, RT_PS_LEVEL_ASPM ) ) {
		rtlpriv->intf_ops->disable_aspm( hw );
		RT_CLEAR_PS_LEVEL( ppsc, RT_PS_LEVEL_ASPM );
	}

	mutex_lock( &rtlpriv->locks.lps_mutex );
	rtl_ps_set_rf_state( hw, ERFON, RF_CHANGE_BY_PS );
	mutex_unlock( &rtlpriv->locks.lps_mutex );
}

void rtl_swlps_rfon_wq_callback( void *data )
{
	struct rtl_works *rtlworks =
	    container_of_dwork_rtl( data, struct rtl_works, ps_rfon_wq );
	struct ieee80211_hw *hw = rtlworks->hw;

	rtl_swlps_rf_awake( hw );
}

void rtl_swlps_rf_sleep( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_mac *mac = rtl_mac( rtl_priv( hw ) );
	struct rtl_ps_ctl *ppsc = rtl_psc( rtl_priv( hw ) );
	u8 sleep_intv;

	if ( !rtlpriv->psc.sw_ps_enabled )
		return;

	if ( ( rtlpriv->sec.being_setkey ) ||
	    ( mac->opmode == NL80211_IFTYPE_ADHOC ) )
		return;

	/*sleep after linked 10s, to let DHCP and 4-way handshake ok enough!! */
	if ( ( mac->link_state != MAC80211_LINKED ) || ( mac->cnt_after_linked < 5 ) )
		return;

	if ( rtlpriv->link_info.busytraffic )
		return;

	spin_lock( &rtlpriv->locks.rf_ps_lock );
	if ( rtlpriv->psc.rfchange_inprogress ) {
		spin_unlock( &rtlpriv->locks.rf_ps_lock );
		return;
	}
	spin_unlock( &rtlpriv->locks.rf_ps_lock );

	mutex_lock( &rtlpriv->locks.lps_mutex );
	rtl_ps_set_rf_state( hw, ERFSLEEP, RF_CHANGE_BY_PS );
	mutex_unlock( &rtlpriv->locks.lps_mutex );

	if ( ppsc->reg_rfps_level & RT_RF_OFF_LEVL_ASPM &&
	    !RT_IN_PS_LEVEL( ppsc, RT_PS_LEVEL_ASPM ) ) {
		rtlpriv->intf_ops->enable_aspm( hw );
		RT_SET_PS_LEVEL( ppsc, RT_PS_LEVEL_ASPM );
	}

	/* here is power save alg, when this beacon is DTIM
	 * we will set sleep time to dtim_period * n;
	 * when this beacon is not DTIM, we will set sleep
	 * time to sleep_intv = rtlpriv->psc.dtim_counter or
	 * MAX_SW_LPS_SLEEP_INTV( default set to 5 ) */

	if ( rtlpriv->psc.dtim_counter == 0 ) {
		if ( hw->conf.ps_dtim_period == 1 )
			sleep_intv = hw->conf.ps_dtim_period * 2;
		else
			sleep_intv = hw->conf.ps_dtim_period;
	} else {
		sleep_intv = rtlpriv->psc.dtim_counter;
	}

	if ( sleep_intv > MAX_SW_LPS_SLEEP_INTV )
		sleep_intv = MAX_SW_LPS_SLEEP_INTV;

	/* this print should always be dtim_conter = 0 &
	 * sleep  = dtim_period, that meaons, we should
	 * awake before every dtim */
	RT_TRACE( rtlpriv, COMP_POWER, DBG_DMESG,
		 "dtim_counter:%x will sleep :%d beacon_intv\n",
		  rtlpriv->psc.dtim_counter, sleep_intv );

	/* we tested that 40ms is enough for sw & hw sw delay */
	queue_delayed_work( rtlpriv->works.rtl_wq, &rtlpriv->works.ps_rfon_wq,
			MSECS( sleep_intv * mac->vif->bss_conf.beacon_int - 40 ) );
}

void rtl_lps_change_work_callback( struct work_struct *work )
{
	struct rtl_works *rtlworks =
	    container_of( work, struct rtl_works, lps_change_work );
	struct ieee80211_hw *hw = rtlworks->hw;
	struct rtl_priv *rtlpriv = rtl_priv( hw );

	if ( rtlpriv->enter_ps )
		rtl_lps_enter_core( hw );
	else
		rtl_lps_leave_core( hw );
}
EXPORT_SYMBOL_GPL( rtl_lps_change_work_callback );

void rtl_lps_enter( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );

	if ( !in_interrupt() )
		return rtl_lps_enter_core( hw );
	rtlpriv->enter_ps = true;
	schedule_work( &rtlpriv->works.lps_change_work );
}
EXPORT_SYMBOL_GPL( rtl_lps_enter );

void rtl_lps_leave( struct ieee80211_hw *hw )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );

	if ( !in_interrupt() )
		return rtl_lps_leave_core( hw );
	rtlpriv->enter_ps = false;
	schedule_work( &rtlpriv->works.lps_change_work );
}
EXPORT_SYMBOL_GPL( rtl_lps_leave );

void rtl_swlps_wq_callback( void *data )
{
	struct rtl_works *rtlworks = container_of_dwork_rtl( data,
				     struct rtl_works,
				     ps_work );
	struct ieee80211_hw *hw = rtlworks->hw;
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	bool ps = false;

	ps = ( hw->conf.flags & IEEE80211_CONF_PS );

	/* we can sleep after ps null send ok */
	if ( rtlpriv->psc.state_inap ) {
		rtl_swlps_rf_sleep( hw );

		if ( rtlpriv->psc.state && !ps ) {
			rtlpriv->psc.sleep_ms = jiffies_to_msecs( jiffies -
						 rtlpriv->psc.last_action );
		}

		if ( ps )
			rtlpriv->psc.last_slept = jiffies;

		rtlpriv->psc.last_action = jiffies;
		rtlpriv->psc.state = ps;
	}
}

static void rtl_p2p_noa_ie( struct ieee80211_hw *hw, void *data,
			   unsigned int len )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct ieee80211_mgmt *mgmt = data;
	struct rtl_p2p_ps_info *p2pinfo = &( rtlpriv->psc.p2p_ps_info );
	u8 *pos, *end, *ie;
	u16 noa_len;
	static u8 p2p_oui_ie_type[4] = {0x50, 0x6f, 0x9a, 0x09};
	u8 noa_num, index , i, noa_index = 0;
	bool find_p2p_ie = false , find_p2p_ps_ie = false;

	pos = ( u8 * )mgmt->u.beacon.variable;
	end = data + len;
	ie = NULL;

	while ( pos + 1 < end ) {
		if ( pos + 2 + pos[1] > end )
			return;

		if ( pos[0] == 221 && pos[1] > 4 ) {
			if ( memcmp( &pos[2], p2p_oui_ie_type, 4 ) == 0 ) {
				ie = pos + 2+4;
				break;
			}
		}
		pos += 2 + pos[1];
	}

	if ( ie == NULL )
		return;
	find_p2p_ie = true;
	/*to find noa ie*/
	while ( ie + 1 < end ) {
		noa_len = le16_to_cpu( *( ( __le16 * )&ie[1] ) );
		if ( ie + 3 + ie[1] > end )
			return;

		if ( ie[0] == 12 ) {
			find_p2p_ps_ie = true;
			if ( ( noa_len - 2 ) % 13 != 0 ) {
				RT_TRACE( rtlpriv, COMP_INIT, DBG_LOUD,
					 "P2P notice of absence: invalid length.%d\n",
					 noa_len );
				return;
			} else {
				noa_num = ( noa_len - 2 ) / 13;
				if ( noa_num > P2P_MAX_NOA_NUM )
					noa_num = P2P_MAX_NOA_NUM;

			}
			noa_index = ie[3];
			if ( rtlpriv->psc.p2p_ps_info.p2p_ps_mode ==
			    P2P_PS_NONE || noa_index != p2pinfo->noa_index ) {
				RT_TRACE( rtlpriv, COMP_FW, DBG_LOUD,
					 "update NOA ie.\n" );
				p2pinfo->noa_index = noa_index;
				p2pinfo->opp_ps = ( ie[4] >> 7 );
				p2pinfo->ctwindow = ie[4] & 0x7F;
				p2pinfo->noa_num = noa_num;
				index = 5;
				for ( i = 0; i < noa_num; i++ ) {
					p2pinfo->noa_count_type[i] =
					 *( u8 * )( ie + index );
					index += 1;
					p2pinfo->noa_duration[i] =
					 le32_to_cpu( *( __le32 * )ie + index );
					index += 4;
					p2pinfo->noa_interval[i] =
					 le32_to_cpu( *( __le32 * )ie + index );
					index += 4;
					p2pinfo->noa_start_time[i] =
					 le32_to_cpu( *( __le32 * )ie + index );
					index += 4;
				}

				if ( p2pinfo->opp_ps == 1 ) {
					p2pinfo->p2p_ps_mode = P2P_PS_CTWINDOW;
					/* Driver should wait LPS entering
					 * CTWindow
					 */
					if ( rtlpriv->psc.fw_current_inpsmode )
						rtl_p2p_ps_cmd( hw,
							       P2P_PS_ENABLE );
				} else if ( p2pinfo->noa_num > 0 ) {
					p2pinfo->p2p_ps_mode = P2P_PS_NOA;
					rtl_p2p_ps_cmd( hw, P2P_PS_ENABLE );
				} else if ( p2pinfo->p2p_ps_mode > P2P_PS_NONE ) {
					rtl_p2p_ps_cmd( hw, P2P_PS_DISABLE );
				}
			}
			break;
		}
		ie += 3 + noa_len;
	}

	if ( find_p2p_ie == true ) {
		if ( ( p2pinfo->p2p_ps_mode > P2P_PS_NONE ) &&
		    ( find_p2p_ps_ie == false ) )
			rtl_p2p_ps_cmd( hw, P2P_PS_DISABLE );
	}
}

static void rtl_p2p_action_ie( struct ieee80211_hw *hw, void *data,
			      unsigned int len )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct ieee80211_mgmt *mgmt = data;
	struct rtl_p2p_ps_info *p2pinfo = &( rtlpriv->psc.p2p_ps_info );
	u8 noa_num, index , i , noa_index = 0;
	u8 *pos, *end, *ie;
	u16 noa_len;
	static u8 p2p_oui_ie_type[4] = {0x50, 0x6f, 0x9a, 0x09};

	pos = ( u8 * )&mgmt->u.action.category;
	end = data + len;
	ie = NULL;

	if ( pos[0] == 0x7f ) {
		if ( memcmp( &pos[1], p2p_oui_ie_type, 4 ) == 0 )
			ie = pos + 3+4;
	}

	if ( ie == NULL )
		return;

	RT_TRACE( rtlpriv, COMP_FW, DBG_LOUD, "action frame find P2P IE.\n" );
	/*to find noa ie*/
	while ( ie + 1 < end ) {
		noa_len = le16_to_cpu( *( __le16 * )&ie[1] );
		if ( ie + 3 + ie[1] > end )
			return;

		if ( ie[0] == 12 ) {
			RT_TRACE( rtlpriv, COMP_FW, DBG_LOUD, "find NOA IE.\n" );
			RT_PRINT_DATA( rtlpriv, COMP_FW, DBG_LOUD, "noa ie ",
				      ie, noa_len );
			if ( ( noa_len - 2 ) % 13 != 0 ) {
				RT_TRACE( rtlpriv, COMP_FW, DBG_LOUD,
					 "P2P notice of absence: invalid length.%d\n",
					 noa_len );
				return;
			} else {
				noa_num = ( noa_len - 2 ) / 13;
				if ( noa_num > P2P_MAX_NOA_NUM )
					noa_num = P2P_MAX_NOA_NUM;

			}
			noa_index = ie[3];
			if ( rtlpriv->psc.p2p_ps_info.p2p_ps_mode ==
			    P2P_PS_NONE || noa_index != p2pinfo->noa_index ) {
				p2pinfo->noa_index = noa_index;
				p2pinfo->opp_ps = ( ie[4] >> 7 );
				p2pinfo->ctwindow = ie[4] & 0x7F;
				p2pinfo->noa_num = noa_num;
				index = 5;
				for ( i = 0; i < noa_num; i++ ) {
					p2pinfo->noa_count_type[i] =
					 *( u8 * )( ie + index );
					index += 1;
					p2pinfo->noa_duration[i] =
					 le32_to_cpu( *( __le32 * )ie + index );
					index += 4;
					p2pinfo->noa_interval[i] =
					 le32_to_cpu( *( __le32 * )ie + index );
					index += 4;
					p2pinfo->noa_start_time[i] =
					 le32_to_cpu( *( __le32 * )ie + index );
					index += 4;
				}

				if ( p2pinfo->opp_ps == 1 ) {
					p2pinfo->p2p_ps_mode = P2P_PS_CTWINDOW;
					/* Driver should wait LPS entering
					 * CTWindow
					 */
					if ( rtlpriv->psc.fw_current_inpsmode )
						rtl_p2p_ps_cmd( hw,
							       P2P_PS_ENABLE );
				} else if ( p2pinfo->noa_num > 0 ) {
					p2pinfo->p2p_ps_mode = P2P_PS_NOA;
					rtl_p2p_ps_cmd( hw, P2P_PS_ENABLE );
				} else if ( p2pinfo->p2p_ps_mode > P2P_PS_NONE ) {
					rtl_p2p_ps_cmd( hw, P2P_PS_DISABLE );
				}
			}
			break;
		}
		ie += 3 + noa_len;
	}
}

void rtl_p2p_ps_cmd( struct ieee80211_hw *hw , u8 p2p_ps_state )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_ps_ctl *rtlps = rtl_psc( rtl_priv( hw ) );
	struct rtl_p2p_ps_info  *p2pinfo = &( rtlpriv->psc.p2p_ps_info );

	RT_TRACE( rtlpriv, COMP_FW, DBG_LOUD, " p2p state %x\n" , p2p_ps_state );
	switch ( p2p_ps_state ) {
	case P2P_PS_DISABLE:
		p2pinfo->p2p_ps_state = p2p_ps_state;
		rtlpriv->cfg->ops->set_hw_reg( hw, HW_VAR_H2C_FW_P2P_PS_OFFLOAD,
					      &p2p_ps_state );
		p2pinfo->noa_index = 0;
		p2pinfo->ctwindow = 0;
		p2pinfo->opp_ps = 0;
		p2pinfo->noa_num = 0;
		p2pinfo->p2p_ps_mode = P2P_PS_NONE;
		if ( rtlps->fw_current_inpsmode ) {
			if ( rtlps->smart_ps == 0 ) {
				rtlps->smart_ps = 2;
				rtlpriv->cfg->ops->set_hw_reg( hw,
					 HW_VAR_H2C_FW_PWRMODE,
					 &rtlps->pwr_mode );
			}

		}
		break;
	case P2P_PS_ENABLE:
		if ( p2pinfo->p2p_ps_mode > P2P_PS_NONE ) {
			p2pinfo->p2p_ps_state = p2p_ps_state;

			if ( p2pinfo->ctwindow > 0 ) {
				if ( rtlps->smart_ps != 0 ) {
					rtlps->smart_ps = 0;
					rtlpriv->cfg->ops->set_hw_reg( hw,
						 HW_VAR_H2C_FW_PWRMODE,
						 &rtlps->pwr_mode );
				}
			}
			rtlpriv->cfg->ops->set_hw_reg( hw,
				 HW_VAR_H2C_FW_P2P_PS_OFFLOAD,
				 &p2p_ps_state );

		}
		break;
	case P2P_PS_SCAN:
	case P2P_PS_SCAN_DONE:
	case P2P_PS_ALLSTASLEEP:
		if ( p2pinfo->p2p_ps_mode > P2P_PS_NONE ) {
			p2pinfo->p2p_ps_state = p2p_ps_state;
			rtlpriv->cfg->ops->set_hw_reg( hw,
				 HW_VAR_H2C_FW_P2P_PS_OFFLOAD,
				 &p2p_ps_state );
		}
		break;
	default:
		break;
	}
	RT_TRACE( rtlpriv, COMP_FW, DBG_LOUD,
		 "ctwindow %x oppps %x\n",
		 p2pinfo->ctwindow , p2pinfo->opp_ps );
	RT_TRACE( rtlpriv, COMP_FW, DBG_LOUD,
		 "count %x duration %x index %x interval %x start time %x noa num %x\n",
		 p2pinfo->noa_count_type[0],
		 p2pinfo->noa_duration[0],
		 p2pinfo->noa_index,
		 p2pinfo->noa_interval[0],
		 p2pinfo->noa_start_time[0],
		 p2pinfo->noa_num );
	RT_TRACE( rtlpriv, COMP_FW, DBG_LOUD, "end\n" );
}

void rtl_p2p_info( struct ieee80211_hw *hw, void *data, unsigned int len )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_mac *mac = rtl_mac( rtl_priv( hw ) );
	struct ieee80211_hdr *hdr = data;

	if ( !mac->p2p )
		return;
	if ( mac->link_state != MAC80211_LINKED )
		return;
	/* min. beacon length + FCS_LEN */
	if ( len <= 40 + FCS_LEN )
		return;

	/* and only beacons from the associated BSSID, please */
	if ( !ether_addr_equal_64bits( hdr->addr3, rtlpriv->mac80211.bssid ) )
		return;

	/* check if this really is a beacon */
	if ( !( ieee80211_is_beacon( hdr->frame_control ) ||
	      ieee80211_is_probe_resp( hdr->frame_control ) ||
	      ieee80211_is_action( hdr->frame_control ) ) )
		return;

	if ( ieee80211_is_action( hdr->frame_control ) )
		rtl_p2p_action_ie( hw , data , len - FCS_LEN );
	else
		rtl_p2p_noa_ie( hw , data , len - FCS_LEN );
}
EXPORT_SYMBOL_GPL( rtl_p2p_info );