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 <linux/version.h>
20#include "rsi_debugfs.h"
21#include "rsi_mgmt.h"
22#include "rsi_common.h"
23#include "rsi_ps.h"
24
25char *str_psstate(enum ps_state state)
26{
27	switch (state) {
28	case PS_NONE:
29		return "PS_NONE";
30	case PS_DISABLE_REQ_SENT:
31		return "PS_DISABLE_REQ_SENT";
32	case PS_ENABLE_REQ_SENT:
33		return "PS_ENABLE_REQ_SENT";
34	case PS_ENABLED:
35		return "PS_ENABLED";
36	default:
37		return "INVALID_STATE";
38	}
39}
40
41static inline void rsi_modify_ps_state(struct rsi_hw *adapter,
42				       enum ps_state nstate)
43{
44	rsi_dbg(INFO_ZONE, "PS state changed %s => %s\n",
45		str_psstate(adapter->ps_state),
46		str_psstate(nstate));
47
48	adapter->ps_state = nstate;
49}
50
51void rsi_default_ps_params(struct rsi_hw *adapter)
52{
53	struct rsi_ps_info *ps_info = &adapter->ps_info;
54
55	ps_info->enabled = true;
56	ps_info->sleep_type = RSI_SLEEP_TYPE_LP;
57	ps_info->tx_threshold = 0;
58	ps_info->rx_threshold = 0;
59	ps_info->tx_hysterisis = 0;
60	ps_info->rx_hysterisis = 0;
61	ps_info->monitor_interval = 0;
62	ps_info->listen_interval = RSI_DEF_LISTEN_INTERVAL;
63	ps_info->num_bcns_per_lis_int = 0;
64	ps_info->dtim_interval_duration = 0;
65	ps_info->num_dtims_per_sleep = 0;
66	ps_info->deep_sleep_wakeup_period = RSI_DEF_DS_WAKEUP_PERIOD;
67}
68
69void rsi_enable_ps(struct rsi_hw *adapter, struct ieee80211_vif *vif)
70{
71	if (adapter->ps_state != PS_NONE) {
72		rsi_dbg(ERR_ZONE,
73			"%s: Cannot accept enable PS in %s state\n",
74			__func__, str_psstate(adapter->ps_state));
75		return;
76	}
77
78	if (rsi_send_ps_request(adapter, true, vif)) {
79		rsi_dbg(ERR_ZONE,
80			"%s: Failed to send PS request to device\n",
81			__func__);
82		return;
83	}
84
85	rsi_modify_ps_state(adapter, PS_ENABLE_REQ_SENT);
86}
87
88/* This function is used to disable power save */
89void rsi_disable_ps(struct rsi_hw *adapter, struct ieee80211_vif *vif)
90{
91	if (adapter->ps_state != PS_ENABLED) {
92		rsi_dbg(ERR_ZONE,
93			"%s: Cannot accept disable PS in %s state\n",
94			__func__, str_psstate(adapter->ps_state));
95		return;
96	}
97
98	if (rsi_send_ps_request(adapter, false, vif)) {
99		rsi_dbg(ERR_ZONE,
100			"%s: Failed to send PS request to device\n",
101			__func__);
102		return;
103	}
104
105	rsi_modify_ps_state(adapter, PS_DISABLE_REQ_SENT);
106}
107
108void rsi_conf_uapsd(struct rsi_hw *adapter, struct ieee80211_vif *vif)
109{
110	int ret;
111
112	if (adapter->ps_state != PS_ENABLED)
113		return;
114
115	ret = rsi_send_ps_request(adapter, false, vif);
116	if (!ret)
117		ret = rsi_send_ps_request(adapter, true, vif);
118	if (ret)
119		rsi_dbg(ERR_ZONE,
120			"%s: Failed to send PS request to device\n",
121			__func__);
122}
123
124int rsi_handle_ps_confirm(struct rsi_hw *adapter, u8 *msg)
125{
126	u16 cfm_type = get_unaligned_le16(msg + PS_CONFIRM_INDEX);
127
128	switch (cfm_type) {
129	case RSI_SLEEP_REQUEST:
130		if (adapter->ps_state == PS_ENABLE_REQ_SENT)
131			rsi_modify_ps_state(adapter, PS_ENABLED);
132		break;
133	case RSI_WAKEUP_REQUEST:
134		if (adapter->ps_state == PS_DISABLE_REQ_SENT)
135			rsi_modify_ps_state(adapter, PS_NONE);
136		break;
137	default:
138		rsi_dbg(ERR_ZONE,
139			"Invalid PS confirm type %x in state %s\n",
140			cfm_type, str_psstate(adapter->ps_state));
141		return -1;
142	}
143
144	return 0;
145}
146
147