367 lines
9 KiB
C
367 lines
9 KiB
C
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/*
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* Mac80211 power management API for ST-Ericsson CW1200 drivers
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*
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* Copyright (c) 2011, ST-Ericsson
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* Author: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/if_ether.h>
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#include "cw1200.h"
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#include "pm.h"
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#include "sta.h"
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#include "bh.h"
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#include "hwbus.h"
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#define CW1200_BEACON_SKIPPING_MULTIPLIER 3
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struct cw1200_udp_port_filter {
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struct wsm_udp_port_filter_hdr hdr;
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/* Up to 4 filters are allowed. */
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struct wsm_udp_port_filter filters[WSM_MAX_FILTER_ELEMENTS];
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} __packed;
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struct cw1200_ether_type_filter {
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struct wsm_ether_type_filter_hdr hdr;
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/* Up to 4 filters are allowed. */
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struct wsm_ether_type_filter filters[WSM_MAX_FILTER_ELEMENTS];
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} __packed;
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static struct cw1200_udp_port_filter cw1200_udp_port_filter_on = {
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.hdr.num = 2,
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.filters = {
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[0] = {
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.action = WSM_FILTER_ACTION_FILTER_OUT,
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.type = WSM_FILTER_PORT_TYPE_DST,
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.port = __cpu_to_le16(67), /* DHCP Bootps */
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},
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[1] = {
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.action = WSM_FILTER_ACTION_FILTER_OUT,
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.type = WSM_FILTER_PORT_TYPE_DST,
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.port = __cpu_to_le16(68), /* DHCP Bootpc */
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},
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}
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};
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static struct wsm_udp_port_filter_hdr cw1200_udp_port_filter_off = {
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.num = 0,
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};
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#ifndef ETH_P_WAPI
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#define ETH_P_WAPI 0x88B4
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#endif
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static struct cw1200_ether_type_filter cw1200_ether_type_filter_on = {
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.hdr.num = 4,
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.filters = {
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[0] = {
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.action = WSM_FILTER_ACTION_FILTER_IN,
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.type = __cpu_to_le16(ETH_P_IP),
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},
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[1] = {
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.action = WSM_FILTER_ACTION_FILTER_IN,
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.type = __cpu_to_le16(ETH_P_PAE),
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},
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[2] = {
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.action = WSM_FILTER_ACTION_FILTER_IN,
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.type = __cpu_to_le16(ETH_P_WAPI),
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},
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[3] = {
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.action = WSM_FILTER_ACTION_FILTER_IN,
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.type = __cpu_to_le16(ETH_P_ARP),
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},
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},
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};
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static struct wsm_ether_type_filter_hdr cw1200_ether_type_filter_off = {
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.num = 0,
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};
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/* private */
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struct cw1200_suspend_state {
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unsigned long bss_loss_tmo;
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unsigned long join_tmo;
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unsigned long direct_probe;
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unsigned long link_id_gc;
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bool beacon_skipping;
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u8 prev_ps_mode;
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};
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static void cw1200_pm_stay_awake_tmo(struct timer_list *unused)
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{
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/* XXX what's the point of this ? */
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}
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int cw1200_pm_init(struct cw1200_pm_state *pm,
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struct cw1200_common *priv)
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{
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spin_lock_init(&pm->lock);
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timer_setup(&pm->stay_awake, cw1200_pm_stay_awake_tmo, 0);
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return 0;
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}
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void cw1200_pm_deinit(struct cw1200_pm_state *pm)
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{
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del_timer_sync(&pm->stay_awake);
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}
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void cw1200_pm_stay_awake(struct cw1200_pm_state *pm,
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unsigned long tmo)
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{
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long cur_tmo;
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spin_lock_bh(&pm->lock);
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cur_tmo = pm->stay_awake.expires - jiffies;
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if (!timer_pending(&pm->stay_awake) || cur_tmo < (long)tmo)
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mod_timer(&pm->stay_awake, jiffies + tmo);
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spin_unlock_bh(&pm->lock);
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}
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static long cw1200_suspend_work(struct delayed_work *work)
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{
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int ret = cancel_delayed_work(work);
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long tmo;
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if (ret > 0) {
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/* Timer is pending */
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tmo = work->timer.expires - jiffies;
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if (tmo < 0)
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tmo = 0;
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} else {
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tmo = -1;
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}
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return tmo;
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}
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static int cw1200_resume_work(struct cw1200_common *priv,
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struct delayed_work *work,
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unsigned long tmo)
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{
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if ((long)tmo < 0)
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return 1;
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return queue_delayed_work(priv->workqueue, work, tmo);
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}
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int cw1200_can_suspend(struct cw1200_common *priv)
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{
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if (atomic_read(&priv->bh_rx)) {
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wiphy_dbg(priv->hw->wiphy, "Suspend interrupted.\n");
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return 0;
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}
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return 1;
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}
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EXPORT_SYMBOL_GPL(cw1200_can_suspend);
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int cw1200_wow_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
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{
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struct cw1200_common *priv = hw->priv;
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struct cw1200_pm_state *pm_state = &priv->pm_state;
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struct cw1200_suspend_state *state;
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int ret;
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spin_lock_bh(&pm_state->lock);
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ret = timer_pending(&pm_state->stay_awake);
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spin_unlock_bh(&pm_state->lock);
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if (ret)
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return -EAGAIN;
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/* Do not suspend when datapath is not idle */
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if (priv->tx_queue_stats.num_queued)
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return -EBUSY;
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/* Make sure there is no configuration requests in progress. */
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if (!mutex_trylock(&priv->conf_mutex))
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return -EBUSY;
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/* Ensure pending operations are done.
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* Note also that wow_suspend must return in ~2.5sec, before
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* watchdog is triggered.
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*/
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if (priv->channel_switch_in_progress)
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goto revert1;
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/* Do not suspend when join is pending */
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if (priv->join_pending)
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goto revert1;
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/* Do not suspend when scanning */
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if (down_trylock(&priv->scan.lock))
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goto revert1;
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/* Lock TX. */
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wsm_lock_tx_async(priv);
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/* Wait to avoid possible race with bh code.
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* But do not wait too long...
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*/
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if (wait_event_timeout(priv->bh_evt_wq,
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!priv->hw_bufs_used, HZ / 10) <= 0)
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goto revert2;
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/* Set UDP filter */
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wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_on.hdr);
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/* Set ethernet frame type filter */
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wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_on.hdr);
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/* Allocate state */
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state = kzalloc(sizeof(struct cw1200_suspend_state), GFP_KERNEL);
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if (!state)
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goto revert3;
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/* Change to legacy PS while going to suspend */
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if (!priv->vif->p2p &&
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priv->join_status == CW1200_JOIN_STATUS_STA &&
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priv->powersave_mode.mode != WSM_PSM_PS) {
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state->prev_ps_mode = priv->powersave_mode.mode;
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priv->powersave_mode.mode = WSM_PSM_PS;
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cw1200_set_pm(priv, &priv->powersave_mode);
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if (wait_event_interruptible_timeout(priv->ps_mode_switch_done,
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!priv->ps_mode_switch_in_progress, 1*HZ) <= 0) {
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goto revert4;
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}
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}
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/* Store delayed work states. */
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state->bss_loss_tmo =
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cw1200_suspend_work(&priv->bss_loss_work);
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state->join_tmo =
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cw1200_suspend_work(&priv->join_timeout);
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state->direct_probe =
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cw1200_suspend_work(&priv->scan.probe_work);
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state->link_id_gc =
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cw1200_suspend_work(&priv->link_id_gc_work);
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cancel_delayed_work_sync(&priv->clear_recent_scan_work);
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atomic_set(&priv->recent_scan, 0);
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/* Enable beacon skipping */
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if (priv->join_status == CW1200_JOIN_STATUS_STA &&
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priv->join_dtim_period &&
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!priv->has_multicast_subscription) {
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state->beacon_skipping = true;
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wsm_set_beacon_wakeup_period(priv,
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priv->join_dtim_period,
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CW1200_BEACON_SKIPPING_MULTIPLIER * priv->join_dtim_period);
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}
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/* Stop serving thread */
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if (cw1200_bh_suspend(priv))
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goto revert5;
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ret = timer_pending(&priv->mcast_timeout);
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if (ret)
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goto revert6;
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/* Store suspend state */
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pm_state->suspend_state = state;
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/* Enable IRQ wake */
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ret = priv->hwbus_ops->power_mgmt(priv->hwbus_priv, true);
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if (ret) {
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wiphy_err(priv->hw->wiphy,
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"PM request failed: %d. WoW is disabled.\n", ret);
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cw1200_wow_resume(hw);
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return -EBUSY;
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}
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/* Force resume if event is coming from the device. */
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if (atomic_read(&priv->bh_rx)) {
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cw1200_wow_resume(hw);
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return -EAGAIN;
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}
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return 0;
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revert6:
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WARN_ON(cw1200_bh_resume(priv));
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revert5:
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cw1200_resume_work(priv, &priv->bss_loss_work,
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state->bss_loss_tmo);
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cw1200_resume_work(priv, &priv->join_timeout,
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state->join_tmo);
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cw1200_resume_work(priv, &priv->scan.probe_work,
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state->direct_probe);
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cw1200_resume_work(priv, &priv->link_id_gc_work,
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state->link_id_gc);
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revert4:
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kfree(state);
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revert3:
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wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_off);
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wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_off);
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revert2:
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wsm_unlock_tx(priv);
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up(&priv->scan.lock);
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revert1:
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mutex_unlock(&priv->conf_mutex);
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return -EBUSY;
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}
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int cw1200_wow_resume(struct ieee80211_hw *hw)
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{
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struct cw1200_common *priv = hw->priv;
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struct cw1200_pm_state *pm_state = &priv->pm_state;
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struct cw1200_suspend_state *state;
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state = pm_state->suspend_state;
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pm_state->suspend_state = NULL;
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/* Disable IRQ wake */
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priv->hwbus_ops->power_mgmt(priv->hwbus_priv, false);
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/* Scan.lock must be released before BH is resumed other way
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* in case when BSS_LOST command arrived the processing of the
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* command will be delayed.
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*/
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up(&priv->scan.lock);
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/* Resume BH thread */
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WARN_ON(cw1200_bh_resume(priv));
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/* Restores previous PS mode */
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if (!priv->vif->p2p && priv->join_status == CW1200_JOIN_STATUS_STA) {
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priv->powersave_mode.mode = state->prev_ps_mode;
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cw1200_set_pm(priv, &priv->powersave_mode);
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}
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if (state->beacon_skipping) {
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wsm_set_beacon_wakeup_period(priv, priv->beacon_int *
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priv->join_dtim_period >
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MAX_BEACON_SKIP_TIME_MS ? 1 :
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priv->join_dtim_period, 0);
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state->beacon_skipping = false;
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}
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/* Resume delayed work */
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cw1200_resume_work(priv, &priv->bss_loss_work,
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state->bss_loss_tmo);
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cw1200_resume_work(priv, &priv->join_timeout,
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state->join_tmo);
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cw1200_resume_work(priv, &priv->scan.probe_work,
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state->direct_probe);
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cw1200_resume_work(priv, &priv->link_id_gc_work,
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state->link_id_gc);
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/* Remove UDP port filter */
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wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_off);
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/* Remove ethernet frame type filter */
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wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_off);
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/* Unlock datapath */
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wsm_unlock_tx(priv);
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/* Unlock configuration mutex */
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mutex_unlock(&priv->conf_mutex);
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/* Free memory */
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kfree(state);
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return 0;
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}
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