2 * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
18 * Purpose: Handles 802.11 power management functions
25 * vnt_enable_power_saving - Enable Power Saving Mode
26 * PSvDiasblePowerSaving - Disable Power Saving Mode
27 * vnt_next_tbtt_wakeup - Decide if we need to wake up at next Beacon
43 * Routine Description:
44 * Enable hw power saving functions
51 void vnt_enable_power_saving(struct vnt_private *priv, u16 listen_interval)
53 u16 aid = priv->current_aid | BIT(14) | BIT(15);
55 /* set period of power up before TBTT */
56 vnt_mac_write_word(priv, MAC_REG_PWBT, C_PWBT);
58 if (priv->op_mode != NL80211_IFTYPE_ADHOC)
60 vnt_mac_write_word(priv, MAC_REG_AIDATIM, aid);
62 /* Warren:06-18-2004,the sequence must follow
63 * PSEN->AUTOSLEEP->GO2DOZE
65 /* enable power saving hw function */
66 vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_PSEN);
69 vnt_mac_reg_bits_on(priv, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
71 /* Warren:MUST turn on this once before turn on AUTOSLEEP ,or the
72 * AUTOSLEEP doesn't work
74 vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_GO2DOZE);
76 if (listen_interval >= 2) {
78 /* clear always listen beacon */
79 vnt_mac_reg_bits_off(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
81 /* first time set listen next beacon */
82 vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_LNBCN);
85 /* always listen beacon */
86 vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
88 dev_dbg(&priv->usb->dev, "PS:Power Saving Mode Enable...\n");
93 * Routine Description:
94 * Disable hw power saving functions
101 void vnt_disable_power_saving(struct vnt_private *priv)
104 /* disable power saving hw function */
105 vnt_control_out(priv, MESSAGE_TYPE_DISABLE_PS, 0,
108 /* clear AutoSleep */
109 vnt_mac_reg_bits_off(priv, MAC_REG_PSCFG, PSCFG_AUTOSLEEP);
111 /* set always listen beacon */
112 vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_ALBCN);
117 * Routine Description:
118 * Check if Next TBTT must wake up
125 int vnt_next_tbtt_wakeup(struct vnt_private *priv)
127 struct ieee80211_hw *hw = priv->hw;
128 struct ieee80211_conf *conf = &hw->conf;
131 if (conf->listen_interval > 1) {
132 /* Turn on wake up to listen next beacon */
133 vnt_mac_reg_bits_on(priv, MAC_REG_PSCTL, PSCTL_LNBCN);