1/*
2 * Copyright (c) 2014 Redpine Signals Inc.
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
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include <linux/etherdevice.h>
18#include <linux/if.h>
19#include "rsi_debugfs.h"
20#include "rsi_mgmt.h"
21#include "rsi_common.h"
22#include "rsi_ps.h"
23
24char *str_psstate(enum ps_state state)
25{
26	switch (state) {
27	case PS_NONE:
28		return "PS_NONE";
29	case PS_DISABLE_REQ_SENT:
30		return "PS_DISABLE_REQ_SENT";
31	case PS_ENABLE_REQ_SENT:
32		return "PS_ENABLE_REQ_SENT";
33	case PS_ENABLED:
34		return "PS_ENABLED";
35	default:
36		return "INVALID_STATE";
37	}
38}
39
40static inline void rsi_modify_ps_state(struct rsi_hw *adapter,
41				       enum ps_state nstate)
42{
43	rsi_dbg(INFO_ZONE, "PS state changed %s => %s\n",
44		str_psstate(adapter->ps_state),
45		str_psstate(nstate));
46
47	adapter->ps_state = nstate;
48}
49
50void rsi_default_ps_params(struct rsi_hw *adapter)
51{
52	struct rsi_ps_info *ps_info = &adapter->ps_info;
53
54	ps_info->enabled = true;
55	ps_info->sleep_type = RSI_SLEEP_TYPE_LP;
56	ps_info->tx_threshold = 0;
57	ps_info->rx_threshold = 0;
58	ps_info->tx_hysterisis = 0;
59	ps_info->rx_hysterisis = 0;
60	ps_info->monitor_interval = 0;
61	ps_info->listen_interval = RSI_DEF_LISTEN_INTERVAL;
62	ps_info->num_bcns_per_lis_int = 0;
63	ps_info->dtim_interval_duration = 0;
64	ps_info->num_dtims_per_sleep = 0;
65	ps_info->deep_sleep_wakeup_period = RSI_DEF_DS_WAKEUP_PERIOD;
66}
67
68void rsi_enable_ps(struct rsi_hw *adapter, struct ieee80211_vif *vif)
69{
70	if (adapter->ps_state != PS_NONE) {
71		rsi_dbg(ERR_ZONE,
72			"%s: Cannot accept enable PS in %s state\n",
73			__func__, str_psstate(adapter->ps_state));
74		return;
75	}
76
77	if (rsi_send_ps_request(adapter, true, vif)) {
78		rsi_dbg(ERR_ZONE,
79			"%s: Failed to send PS request to device\n",
80			__func__);
81		return;
82	}
83
84	rsi_modify_ps_state(adapter, PS_ENABLE_REQ_SENT);
85}
86
87/* This function is used to disable power save */
88void rsi_disable_ps(struct rsi_hw *adapter, struct ieee80211_vif *vif)
89{
90	if (adapter->ps_state != PS_ENABLED) {
91		rsi_dbg(ERR_ZONE,
92			"%s: Cannot accept disable PS in %s state\n",
93			__func__, str_psstate(adapter->ps_state));
94		return;
95	}
96
97	if (rsi_send_ps_request(adapter, false, vif)) {
98		rsi_dbg(ERR_ZONE,
99			"%s: Failed to send PS request to device\n",
100			__func__);
101		return;
102	}
103
104	rsi_modify_ps_state(adapter, PS_DISABLE_REQ_SENT);
105}
106
107void rsi_conf_uapsd(struct rsi_hw *adapter, struct ieee80211_vif *vif)
108{
109	int ret;
110
111	if (adapter->ps_state != PS_ENABLED)
112		return;
113
114	ret = rsi_send_ps_request(adapter, false, vif);
115	if (!ret)
116		ret = rsi_send_ps_request(adapter, true, vif);
117	if (ret)
118		rsi_dbg(ERR_ZONE,
119			"%s: Failed to send PS request to device\n",
120			__func__);
121}
122
123int rsi_handle_ps_confirm(struct rsi_hw *adapter, u8 *msg)
124{
125	u16 cfm_type = get_unaligned_le16(msg + PS_CONFIRM_INDEX);
126
127	switch (cfm_type) {
128	case RSI_SLEEP_REQUEST:
129		if (adapter->ps_state == PS_ENABLE_REQ_SENT)
130			rsi_modify_ps_state(adapter, PS_ENABLED);
131		break;
132	case RSI_WAKEUP_REQUEST:
133		if (adapter->ps_state == PS_DISABLE_REQ_SENT)
134			rsi_modify_ps_state(adapter, PS_NONE);
135		break;
136	default:
137		rsi_dbg(ERR_ZONE,
138			"Invalid PS confirm type %x in state %s\n",
139			cfm_type, str_psstate(adapter->ps_state));
140		return -1;
141	}
142
143	return 0;
144}
145
146