1 /******************************************************************************
2 *
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
5 *
6 * GPL LICENSE SUMMARY
7 *
8 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
22 * USA
23 *
24 * The full GNU General Public License is included in this distribution
25 * in the file called COPYING.
26 *
27 * Contact Information:
28 * Intel Linux Wireless <ilw@linux.intel.com>
29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
30 *
31 * BSD LICENSE
32 *
33 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 *
40 * * Redistributions of source code must retain the above copyright
41 * notice, this list of conditions and the following disclaimer.
42 * * Redistributions in binary form must reproduce the above copyright
43 * notice, this list of conditions and the following disclaimer in
44 * the documentation and/or other materials provided with the
45 * distribution.
46 * * Neither the name Intel Corporation nor the names of its
47 * contributors may be used to endorse or promote products derived
48 * from this software without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
61 *
62 *****************************************************************************/
63
64 #include <linux/kernel.h>
65 #include <linux/module.h>
66 #include <linux/slab.h>
67 #include <linux/init.h>
68
69 #include <net/mac80211.h>
70
71 #include "iwl-debug.h"
72 #include "mvm.h"
73 #include "iwl-modparams.h"
74 #include "fw-api-power.h"
75
76 #define POWER_KEEP_ALIVE_PERIOD_SEC 25
77
iwl_mvm_power_log(struct iwl_mvm * mvm,struct iwl_powertable_cmd * cmd)78 static void iwl_mvm_power_log(struct iwl_mvm *mvm,
79 struct iwl_powertable_cmd *cmd)
80 {
81 IWL_DEBUG_POWER(mvm,
82 "Sending power table command for power level %d, flags = 0x%X\n",
83 iwlmvm_mod_params.power_scheme,
84 le16_to_cpu(cmd->flags));
85 IWL_DEBUG_POWER(mvm, "Keep alive = %u sec\n", cmd->keep_alive_seconds);
86
87 if (cmd->flags & cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK)) {
88 IWL_DEBUG_POWER(mvm, "Rx timeout = %u usec\n",
89 le32_to_cpu(cmd->rx_data_timeout));
90 IWL_DEBUG_POWER(mvm, "Tx timeout = %u usec\n",
91 le32_to_cpu(cmd->tx_data_timeout));
92 IWL_DEBUG_POWER(mvm, "LP RX RSSI threshold = %u\n",
93 cmd->lprx_rssi_threshold);
94 }
95 }
96
iwl_mvm_power_build_cmd(struct iwl_mvm * mvm,struct ieee80211_vif * vif,struct iwl_powertable_cmd * cmd)97 void iwl_mvm_power_build_cmd(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
98 struct iwl_powertable_cmd *cmd)
99 {
100 struct ieee80211_hw *hw = mvm->hw;
101 struct ieee80211_chanctx_conf *chanctx_conf;
102 struct ieee80211_channel *chan;
103 int dtimper, dtimper_msec;
104 int keep_alive;
105 bool radar_detect = false;
106
107 /*
108 * Regardless of power management state the driver must set
109 * keep alive period. FW will use it for sending keep alive NDPs
110 * immediately after association.
111 */
112 cmd->keep_alive_seconds = POWER_KEEP_ALIVE_PERIOD_SEC;
113
114 if (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM)
115 return;
116
117 cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_SAVE_ENA_MSK);
118
119 if (!vif->bss_conf.ps)
120 return;
121
122 cmd->flags |= cpu_to_le16(POWER_FLAGS_POWER_MANAGEMENT_ENA_MSK);
123
124 dtimper = hw->conf.ps_dtim_period ?: 1;
125
126 /* Check if radar detection is required on current channel */
127 rcu_read_lock();
128 chanctx_conf = rcu_dereference(vif->chanctx_conf);
129 WARN_ON(!chanctx_conf);
130 if (chanctx_conf) {
131 chan = chanctx_conf->def.chan;
132 radar_detect = chan->flags & IEEE80211_CHAN_RADAR;
133 }
134 rcu_read_unlock();
135
136 /* Check skip over DTIM conditions */
137 if (!radar_detect && (dtimper <= 10) &&
138 (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_LP))
139 cmd->flags |= cpu_to_le16(POWER_FLAGS_SKIP_OVER_DTIM_MSK);
140
141 /* Check that keep alive period is at least 3 * DTIM */
142 dtimper_msec = dtimper * vif->bss_conf.beacon_int;
143 keep_alive = max_t(int, 3 * dtimper_msec,
144 MSEC_PER_SEC * cmd->keep_alive_seconds);
145 keep_alive = DIV_ROUND_UP(keep_alive, MSEC_PER_SEC);
146 cmd->keep_alive_seconds = keep_alive;
147
148 cmd->rx_data_timeout = cpu_to_le32(100 * USEC_PER_MSEC);
149 cmd->tx_data_timeout = cpu_to_le32(100 * USEC_PER_MSEC);
150 }
151
iwl_mvm_power_update_mode(struct iwl_mvm * mvm,struct ieee80211_vif * vif)152 int iwl_mvm_power_update_mode(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
153 {
154 struct iwl_powertable_cmd cmd = {};
155
156 if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
157 return 0;
158
159 iwl_mvm_power_build_cmd(mvm, vif, &cmd);
160 iwl_mvm_power_log(mvm, &cmd);
161
162 return iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, CMD_SYNC,
163 sizeof(cmd), &cmd);
164 }
165
iwl_mvm_power_disable(struct iwl_mvm * mvm,struct ieee80211_vif * vif)166 int iwl_mvm_power_disable(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
167 {
168 struct iwl_powertable_cmd cmd = {};
169
170 if (vif->type != NL80211_IFTYPE_STATION || vif->p2p)
171 return 0;
172
173 if (iwlmvm_mod_params.power_scheme != IWL_POWER_SCHEME_CAM)
174 cmd.flags |= cpu_to_le16(POWER_FLAGS_POWER_SAVE_ENA_MSK);
175
176 iwl_mvm_power_log(mvm, &cmd);
177
178 return iwl_mvm_send_cmd_pdu(mvm, POWER_TABLE_CMD, CMD_ASYNC,
179 sizeof(cmd), &cmd);
180 }
181