ath/wcn36xx/pmc.c

0001 /*
0002  * Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@gmail.com>
0003  *
0004  * Permission to use, copy, modify, and/or distribute this software for any
0005  * purpose with or without fee is hereby granted, provided that the above
0006  * copyright notice and this permission notice appear in all copies.
0007  *
0008  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
0009  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
0010  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
0011  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
0012  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
0013  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
0014  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
0015  */
0016
0017 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0018
0019 #include "wcn36xx.h"
0020
0021 #define WCN36XX_BMPS_FAIL_THREHOLD 3
0022
0023 int wcn36xx_pmc_enter_bmps_state(struct wcn36xx *wcn,
0024                  struct ieee80211_vif *vif)
0025 {
0026     int ret = 0;
0027     struct wcn36xx_vif *vif_priv = wcn36xx_vif_to_priv(vif);
0028     /* TODO: Make sure the TX chain clean */
0029     ret = wcn36xx_smd_enter_bmps(wcn, vif);
0030     if (!ret) {
0031         wcn36xx_dbg(WCN36XX_DBG_PMC, "Entered BMPS\n");
0032         vif_priv->pw_state = WCN36XX_BMPS;
0033         vif_priv->bmps_fail_ct = 0;
0034         vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
0035     } else {
0036         /*
0037          * One of the reasons why HW will not enter BMPS is because
0038          * driver is trying to enter bmps before first beacon was
0039          * received just after auth complete
0040          */
0041         wcn36xx_err("Can not enter BMPS!\n");
0042
0043         if (vif_priv->bmps_fail_ct++ == WCN36XX_BMPS_FAIL_THREHOLD) {
0044             ieee80211_connection_loss(vif);
0045             vif_priv->bmps_fail_ct = 0;
0046         }
0047     }
0048     return ret;
0049 }
0050
0051 int wcn36xx_pmc_exit_bmps_state(struct wcn36xx *wcn,
0052                 struct ieee80211_vif *vif)
0053 {
0054     struct wcn36xx_vif *vif_priv = wcn36xx_vif_to_priv(vif);
0055
0056     if (WCN36XX_BMPS != vif_priv->pw_state) {
0057         /* Unbalanced call or last BMPS enter failed */
0058         wcn36xx_dbg(WCN36XX_DBG_PMC,
0059                 "Not in BMPS mode, no need to exit\n");
0060         return -EALREADY;
0061     }
0062     wcn36xx_smd_exit_bmps(wcn, vif);
0063     vif_priv->pw_state = WCN36XX_FULL_POWER;
0064     vif->driver_flags &= ~IEEE80211_VIF_BEACON_FILTER;
0065     return 0;
0066 }
0067
0068 int wcn36xx_enable_keep_alive_null_packet(struct wcn36xx *wcn,
0069                       struct ieee80211_vif *vif)
0070 {
0071     wcn36xx_dbg(WCN36XX_DBG_PMC, "%s\n", __func__);
0072     return wcn36xx_smd_keep_alive_req(wcn, vif,
0073                       WCN36XX_HAL_KEEP_ALIVE_NULL_PKT);
0074 }