/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 *
 * 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 COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>

#include <net/mac80211.h>

#include "iwl-debug.h"
#include "mvm.h"
#include "iwl-modparams.h"
#include "fw-api-power.h"

#define POWER_KEEP_ALIVE_PERIOD_SEC    25

static void iwl_mvm_power_build_cmd(struct iwl_mvm *mvm,
				    struct ieee80211_vif *vif,
				    struct iwl_powertable_cmd *cmd)
{
	struct ieee80211_hw *hw = mvm->hw;
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
	int dtimper, dtimper_msec;
	int keep_alive;
	bool radar_detect = false;

	if ((!vif->bss_conf.ps) ||
	    (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM))
		return;

	cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK |
				  POWER_FLAGS_POWER_SAVE_ENA_MSK);

	dtimper = hw->conf.ps_dtim_period ?: 1;

	/* Check if radar detection is required on current channel */
	rcu_read_lock();
	chanctx_conf = rcu_dereference(vif->chanctx_conf);
	WARN_ON(!chanctx_conf);
	if (chanctx_conf) {
		chan = chanctx_conf->def.chan;
		radar_detect = chan->flags & IEEE80211_CHAN_RADAR;
	}
	rcu_read_unlock();

	/* Check skip over DTIM conditions */
	if (!radar_detect && (dtimper <= 10) &&
	    (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_LP))
		cmd->flags |= cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK);

	/* Check that keep alive period is at least 3 * DTIM */
	dtimper_msec = dtimper * vif->bss_conf.beacon_int;
	keep_alive = max_t(int, 3 * dtimper_msec,
			   MSEC_PER_SEC * POWER_KEEP_ALIVE_PERIOD_SEC);
	keep_alive = DIV_ROUND_UP(keep_alive, MSEC_PER_SEC);

	cmd->keep_alive_seconds = keep_alive;

	if (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_LP) {
		/* TODO: Also for D3 (device sleep / WoWLAN) */
		cmd->rx_data_timeout = cpu_to_le32(10);
		cmd->tx_data_timeout = cpu_to_le32(10);
	} else {
		cmd->rx_data_timeout = cpu_to_le32(50);
		cmd->tx_data_timeout = cpu_to_le32(50);
	}
}

int iwl_mvm_power_update_mode(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
	struct iwl_powertable_cmd cmd = {};

	if (!iwlwifi_mod_params.power_save) {
		IWL_DEBUG_POWER(mvm, "Power management is not allowed\n");
		return 0;
	}

	if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
		return 0;

	iwl_mvm_power_build_cmd(mvm, vif, &cmd);

	IWL_DEBUG_POWER(mvm,
			"Sending power table command for power level %d, flags = 0x%X\n",
			iwlmvm_mod_params.power_scheme, le16_to_cpu(cmd.flags));

	if (cmd.flags & cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK)) {
		IWL_DEBUG_POWER(mvm, "Keep alive = %u sec\n",
				cmd.keep_alive_seconds);
		IWL_DEBUG_POWER(mvm, "Rx timeout = %u usec\n",
				le32_to_cpu(cmd.rx_data_timeout));
		IWL_DEBUG_POWER(mvm, "Tx timeout = %u usec\n",
				le32_to_cpu(cmd.tx_data_timeout));
		IWL_DEBUG_POWER(mvm, "LP RX RSSI threshold = %u\n",
				cmd.lprx_rssi_threshold);
	}

	return iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, CMD_SYNC,
				    sizeof(cmd), &cmd);
}

int iwl_mvm_power_disable(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
	struct iwl_powertable_cmd cmd = {};

	if (!iwlwifi_mod_params.power_save) {
		IWL_DEBUG_POWER(mvm, "Power management is not allowed\n");
		return 0;
	}

	if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
		return 0;

	IWL_DEBUG_POWER(mvm,
			"Sending power table command power level %d, flags = 0x%X\n",
			iwlmvm_mod_params.power_scheme, le16_to_cpu(cmd.flags));

	return iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, CMD_ASYNC,
				    sizeof(cmd), &cmd);
}

#ifdef CONFIG_IWLWIFI_DEBUGFS
void iwl_power_get_params(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			  struct iwl_powertable_cmd *cmd)
{
	iwl_mvm_power_build_cmd(mvm, vif, cmd);
}
#endif /* CONFIG_IWLWIFI_DEBUGFS */