drivers/staging/vt6656/power.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
   4  * All rights reserved.
   5  *
   6  * File: power.c
   7  *
   8  * Purpose: Handles 802.11 power management functions
   9  *
  10  * Author: Lyndon Chen
  11  *
  12  * Date: July 17, 2002
  13  *
  14  * Functions:
  15  *      vnt_enable_power_saving - Enable Power Saving Mode
  16  *      PSvDiasblePowerSaving - Disable Power Saving Mode
  17  *      vnt_next_tbtt_wakeup - Decide if we need to wake up at next Beacon
  18  *
  19  * Revision History:
  20  *
  21  */
  22
  23 #include "mac.h"
  24 #include "device.h"
  25 #include "power.h"
  26 #include "wcmd.h"
  27 #include "rxtx.h"
  28 #include "card.h"
  29 #include "usbpipe.h"
  30
  31 /*
  32  *
  33  * Routine Description:
  34  * Enable hw power saving functions
  35  *
  36  * Return Value:
  37  *    None.
  38  *
  39  */
  40
  41 void vnt_enable_power_saving(struct vnt_private *priv, u16 listen_interval)
  42 {
  43         u16 aid = priv->current_aid | BIT(14) | BIT(15);
  44
  45         /* set period of power up before TBTT */
  46         vnt_mac_write_word(priv, MAC_REG_PWBT, C_PWBT);
  47
  48         if (priv->op_mode != NL80211_IFTYPE_ADHOC)
  49                 /* set AID */
  50                 vnt_mac_write_word(priv, MAC_REG_AIDATIM, aid);
  51
  52         /* Warren:06-18-2004,the sequence must follow
  53          * PSEN->AUTOSLEEP->GO2DOZE
  54          */
  55         /* enable power saving hw function */
  56         vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_PSEN);
  57
  58         /* Set AutoSleep */
  59         vnt_mac_reg_bits_on(priv, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
  60
  61         /* Warren:MUST turn on this once before turn on AUTOSLEEP ,or the
  62          * AUTOSLEEP doesn't work
  63          */
  64         vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_GO2DOZE);
  65
  66         if (listen_interval >= 2) {
  67                 /* clear always listen beacon */
  68                 vnt_mac_reg_bits_off(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
  69
  70                 /* first time set listen next beacon */
  71                 vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_LNBCN);
  72         } else {
  73                 /* always listen beacon */
  74                 vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
  75         }
  76
  77         dev_dbg(&priv->usb->dev,  "PS:Power Saving Mode Enable...\n");
  78 }
  79
  80 /*
  81  *
  82  * Routine Description:
  83  * Disable hw power saving functions
  84  *
  85  * Return Value:
  86  *    None.
  87  *
  88  */
  89
  90 void vnt_disable_power_saving(struct vnt_private *priv)
  91 {
  92         /* disable power saving hw function */
  93         vnt_control_out(priv, MESSAGE_TYPE_DISABLE_PS, 0,
  94                         0, 0, NULL);
  95
  96         /* clear AutoSleep */
  97         vnt_mac_reg_bits_off(priv, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
  98
  99         /* set always listen beacon */
 100         vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
 101 }
 102
 103 /*
 104  *
 105  * Routine Description:
 106  * Check if Next TBTT must wake up
 107  *
 108  * Return Value:
 109  *    None.
 110  *
 111  */
 112
 113 int vnt_next_tbtt_wakeup(struct vnt_private *priv)
 114 {
 115         struct ieee80211_hw *hw = priv->hw;
 116         struct ieee80211_conf *conf = &hw->conf;
 117         int wake_up = false;
 118
 119         if (conf->listen_interval > 1) {
 120                 /* Turn on wake up to listen next beacon */
 121                 vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_LNBCN);
 122                 wake_up = true;
 123         }
 124
 125         return wake_up;
 126 }