/******************************************************************************
 *
 * Copyright(c) 2009-2010  Realtek Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License 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 Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 * wlanfae <wlanfae@realtek.com>
 * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
 * Hsinchu 300, Taiwan.
 *
 * Larry Finger <Larry.Finger@lwfinger.net>
 *
 *****************************************************************************/

#include "wifi.h"
#include "base.h"
#include "ps.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));
	bool init_status = true;

	/*<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 */
	rtlpriv->cfg->ops->hw_init(hw);
	RT_CLEAR_PS_LEVEL(ppsc, RT_RF_OFF_LEVL_HALT_NIC);
	/*init_status = false; */

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

	/*<enable timer> */
	rtl_watch_dog_timer_callback((unsigned long)hw);

	return init_status;
}
EXPORT_SYMBOL(rtl_ps_enable_nic);

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

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

	/*<2> Disable Interrupt */
	rtlpriv->cfg->ops->disable_interrupt(hw);

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

	return status;
}
EXPORT_SYMBOL(rtl_ps_disable_nic);

bool rtl_ps_set_rf_state(struct ieee80211_hw *hw,
			 enum rf_pwrstate state_toset,
			 u32 changesource, bool protect_or_not)
{
	struct rtl_priv *rtlpriv = rtl_priv(hw);
	struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
	enum rf_pwrstate rtstate;
	bool b_actionallowed = false;
	u16 rfwait_cnt = 0;
	unsigned long flag;

	/*protect_or_not = true; */

	if (protect_or_not)
		goto no_protect;

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

			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_irqrestore(&rtlpriv->locks.rf_ps_lock,
					       flag);
			break;
		}
	}

no_protect:
	rtstate = ppsc->rfpwr_state;

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

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

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

		break;

	case ERFOFF:

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

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

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

	default:
		RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
			 ("switch case not process\n"));
		break;
	}

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

	if (!protect_or_not) {
		spin_lock_irqsave(&rtlpriv->locks.rf_ps_lock, flag);
		ppsc->rfchange_inprogress = false;
		spin_unlock_irqrestore(&rtlpriv->locks.rf_ps_lock, flag);
	}

	return b_actionallowed;
}
EXPORT_SYMBOL(rtl_ps_set_rf_state);

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->b_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_RF_OFF_LEVL_ASPM) &&
		    rtlhal->interface == INTF_PCI) {
			rtlpriv->intf_ops->disable_aspm(hw);
			RT_CLEAR_PS_LEVEL(ppsc, RT_RF_OFF_LEVL_ASPM);
		}
	}

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

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

	ppsc->b_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 (is_hal_stop(rtlhal))
		return;

	if (rtlpriv->sec.being_setkey)
		return;

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

		/*
		 *Do not enter IPS in the following conditions:
		 *(1) RF is already OFF or Sleep
		 *(2) b_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->b_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->b_in_powersavemode = true;

			/*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));
}

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;
	unsigned long flags;

	spin_lock_irqsave(&rtlpriv->locks.ips_lock, flags);

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

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

			ppsc->inactive_pwrstate = ERFON;
			ppsc->b_in_powersavemode = false;

			_rtl_ps_inactive_ps(hw);
		}
	}

	spin_unlock_irqrestore(&rtlpriv->locks.ips_lock, flags);
}

/*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.*/
static 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));
	u8 rpwm_val, fw_pwrmode;

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

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

	if (ppsc->dot11_psmode == rt_psmode)
		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->b_fwctrl_lps) && (ppsc->b_leisure_ps) &&
	     ppsc->report_linked) {
		bool b_fw_current_inps;
		if (ppsc->dot11_psmode == EACTIVE) {
			RT_TRACE(rtlpriv, COMP_RF, DBG_DMESG,
				 ("FW LPS leave ps_mode:%x\n",
				  FW_PS_ACTIVE_MODE));

			rpwm_val = 0x0C;	/* RF on */
			fw_pwrmode = FW_PS_ACTIVE_MODE;
			rtlpriv->cfg->ops->set_hw_reg(hw, HW_VAR_SET_RPWM,
					(u8 *) (&rpwm_val));
			rtlpriv->cfg->ops->set_hw_reg(hw,
					HW_VAR_H2C_FW_PWRMODE,
					(u8 *) (&fw_pwrmode));
			b_fw_current_inps = false;

			rtlpriv->cfg->ops->set_hw_reg(hw,
					HW_VAR_FW_PSMODE_STATUS,
					(u8 *) (&b_fw_current_inps));

		} else {
			if (rtl_get_fwlps_doze(hw)) {
				RT_TRACE(rtlpriv, COMP_RF, DBG_DMESG,
						("FW LPS enter ps_mode:%x\n",
						 ppsc->fwctrl_psmode));

				rpwm_val = 0x02;	/* RF off */
				b_fw_current_inps = true;
				rtlpriv->cfg->ops->set_hw_reg(hw,
						HW_VAR_FW_PSMODE_STATUS,
						(u8 *) (&b_fw_current_inps));
				rtlpriv->cfg->ops->set_hw_reg(hw,
						HW_VAR_H2C_FW_PWRMODE,
						(u8 *) (&ppsc->fwctrl_psmode));

				rtlpriv->cfg->ops->set_hw_reg(hw,
						HW_VAR_SET_RPWM,
						(u8 *) (&rpwm_val));
			} else {
				/* Reset the power save related parameters. */
				ppsc->dot11_psmode = EACTIVE;
			}
		}
	}
}

/*Enter the leisure power save mode.*/
void rtl_lps_enter(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);
	unsigned long flag;

	if (!(ppsc->b_fwctrl_lps && ppsc->b_leisure_ps))
		return;

	if (rtlpriv->sec.being_setkey)
		return;

	if (rtlpriv->link_info.b_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;

	spin_lock_irqsave(&rtlpriv->locks.lps_lock, flag);

	if (ppsc->b_leisure_ps) {
		/* Idle for a while if we connect to AP a while ago. */
		if (mac->cnt_after_linked >= 2) {
			if (ppsc->dot11_psmode == EACTIVE) {
				RT_TRACE(rtlpriv, COMP_POWER, DBG_LOUD,
					("Enter 802.11 power save mode...\n"));

				rtl_lps_set_psmode(hw, EAUTOPS);
			}
		}
	}
	spin_unlock_irqrestore(&rtlpriv->locks.lps_lock, flag);
}

/*Leave the leisure power save mode.*/
void rtl_lps_leave(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));
	unsigned long flag;

	spin_lock_irqsave(&rtlpriv->locks.lps_lock, flag);

	if (ppsc->b_fwctrl_lps && ppsc->b_leisure_ps) {
		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_RF_LPS_LEVEL_ASPM) &&
			    rtlhal->interface == INTF_PCI) {
				rtlpriv->intf_ops->disable_aspm(hw);
				RT_CLEAR_PS_LEVEL(ppsc, RT_RF_LPS_LEVEL_ASPM);
			}

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

			rtl_lps_set_psmode(hw, EACTIVE);
		}
	}
	spin_unlock_irqrestore(&rtlpriv->locks.lps_lock, flag);
}