1 /*
2  * Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@gmail.com>
3  *
4  * Permission to use, copy, modify, and/or distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 
19 #include "wcn36xx.h"
20 
21 #define WCN36XX_BMPS_FAIL_THREHOLD 3
22 
wcn36xx_pmc_enter_bmps_state(struct wcn36xx * wcn,struct ieee80211_vif * vif)23 int wcn36xx_pmc_enter_bmps_state(struct wcn36xx *wcn,
24 				 struct ieee80211_vif *vif)
25 {
26 	int ret = 0;
27 	struct wcn36xx_vif *vif_priv = wcn36xx_vif_to_priv(vif);
28 	/* TODO: Make sure the TX chain clean */
29 	ret = wcn36xx_smd_enter_bmps(wcn, vif);
30 	if (!ret) {
31 		wcn36xx_dbg(WCN36XX_DBG_PMC, "Entered BMPS\n");
32 		vif_priv->pw_state = WCN36XX_BMPS;
33 		vif_priv->bmps_fail_ct = 0;
34 		vif->driver_flags |= IEEE80211_VIF_BEACON_FILTER;
35 	} else {
36 		/*
37 		 * One of the reasons why HW will not enter BMPS is because
38 		 * driver is trying to enter bmps before first beacon was
39 		 * received just after auth complete
40 		 */
41 		wcn36xx_err("Can not enter BMPS!\n");
42 
43 		if (vif_priv->bmps_fail_ct++ == WCN36XX_BMPS_FAIL_THREHOLD) {
44 			ieee80211_connection_loss(vif);
45 			vif_priv->bmps_fail_ct = 0;
46 		}
47 	}
48 	return ret;
49 }
50 
wcn36xx_pmc_exit_bmps_state(struct wcn36xx * wcn,struct ieee80211_vif * vif)51 int wcn36xx_pmc_exit_bmps_state(struct wcn36xx *wcn,
52 				struct ieee80211_vif *vif)
53 {
54 	struct wcn36xx_vif *vif_priv = wcn36xx_vif_to_priv(vif);
55 
56 	if (WCN36XX_BMPS != vif_priv->pw_state) {
57 		/* Unbalanced call or last BMPS enter failed */
58 		wcn36xx_dbg(WCN36XX_DBG_PMC,
59 			    "Not in BMPS mode, no need to exit\n");
60 		return -EALREADY;
61 	}
62 	wcn36xx_smd_exit_bmps(wcn, vif);
63 	vif_priv->pw_state = WCN36XX_FULL_POWER;
64 	vif->driver_flags &= ~IEEE80211_VIF_BEACON_FILTER;
65 	return 0;
66 }
67 
wcn36xx_enable_keep_alive_null_packet(struct wcn36xx * wcn,struct ieee80211_vif * vif)68 int wcn36xx_enable_keep_alive_null_packet(struct wcn36xx *wcn,
69 					  struct ieee80211_vif *vif)
70 {
71 	wcn36xx_dbg(WCN36XX_DBG_PMC, "%s\n", __func__);
72 	return wcn36xx_smd_keep_alive_req(wcn, vif,
73 					  WCN36XX_HAL_KEEP_ALIVE_NULL_PKT);
74 }
75