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/*
* Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
*
* File: power.c
*
* Purpose: Handles 802.11 power management functions
*
* Author: Lyndon Chen
*
* Date: July 17, 2002
*
* Functions:
* vnt_enable_power_saving - Enable Power Saving Mode
* PSvDiasblePowerSaving - Disable Power Saving Mode
* vnt_next_tbtt_wakeup - Decide if we need to wake up at next Beacon
*
* Revision History:
*
*/
#include "mac.h"
#include "device.h"
#include "power.h"
#include "wcmd.h"
#include "rxtx.h"
#include "card.h"
#include "usbpipe.h"
/*
*
* Routine Description:
* Enable hw power saving functions
*
* Return Value:
* None.
*
*/
void vnt_enable_power_saving(struct vnt_private *priv, u16 listen_interval)
{
u16 aid = priv->current_aid | BIT(14) | BIT(15);
/* set period of power up before TBTT */
vnt_mac_write_word(priv, MAC_REG_PWBT, C_PWBT);
if (priv->op_mode != NL80211_IFTYPE_ADHOC)
/* set AID */
vnt_mac_write_word(priv, MAC_REG_AIDATIM, aid);
/* Warren:06-18-2004,the sequence must follow
* PSEN->AUTOSLEEP->GO2DOZE
*/
/* enable power saving hw function */
vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_PSEN);
/* Set AutoSleep */
vnt_mac_reg_bits_on(priv, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
/* Warren:MUST turn on this once before turn on AUTOSLEEP ,or the
* AUTOSLEEP doesn't work
*/
vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_GO2DOZE);
if (listen_interval >= 2) {
/* clear always listen beacon */
vnt_mac_reg_bits_off(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
/* first time set listen next beacon */
vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_LNBCN);
} else
/* always listen beacon */
vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
dev_dbg(&priv->usb->dev, "PS:Power Saving Mode Enable...\n");
}
/*
*
* Routine Description:
* Disable hw power saving functions
*
* Return Value:
* None.
*
*/
void vnt_disable_power_saving(struct vnt_private *priv)
{
/* disable power saving hw function */
vnt_control_out(priv, MESSAGE_TYPE_DISABLE_PS, 0,
0, 0, NULL);
/* clear AutoSleep */
vnt_mac_reg_bits_off(priv, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
/* set always listen beacon */
vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
}
/*
*
* Routine Description:
* Check if Next TBTT must wake up
*
* Return Value:
* None.
*
*/
int vnt_next_tbtt_wakeup(struct vnt_private *priv)
{
struct ieee80211_hw *hw = priv->hw;
struct ieee80211_conf *conf = &hw->conf;
int wake_up = false;
if (conf->listen_interval > 1) {
/* Turn on wake up to listen next beacon */
vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_LNBCN);
wake_up = true;
}
return wake_up;
}
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