The goal here is to minimize host wakeups by utilizing as many harware
filters as possible. This may make sense in cell phone applications,
but it's not generic enough to be universally useful.
I haven't looked into the WoWLAN subsystem to see if there's a better
way to do this yet, hence this patch series. :)
Signed-off-by: Solomon Peachy <pizza@xxxxxxxxxxxx>
---
drivers/staging/cw1200/pm.c | 459 ++++++++++++++++++++++++++++++++++++++++++++
drivers/staging/cw1200/pm.h | 49 +++++
2 files changed, 508 insertions(+)
create mode 100644 drivers/staging/cw1200/pm.c
create mode 100644 drivers/staging/cw1200/pm.h
diff --git a/drivers/staging/cw1200/pm.c b/drivers/staging/cw1200/pm.c
new file mode 100644
index 0000000..98796cb
--- /dev/null
+++ b/drivers/staging/cw1200/pm.c
@@ -0,0 +1,459 @@
+/*
+ * Mac80211 power management API for ST-Ericsson CW1200 drivers
+ *
+ * Copyright (c) 2011, ST-Ericsson
+ * Author: Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/if_ether.h>
+#include "cw1200.h"
+#include "pm.h"
+#include "sta.h"
+#include "bh.h"
+#include "sbus.h"
+
+#define CW1200_BEACON_SKIPPING_MULTIPLIER 3
+
+struct cw1200_udp_port_filter {
+ struct wsm_udp_port_filter_hdr hdr;
+ struct wsm_udp_port_filter dhcp;
+ struct wsm_udp_port_filter upnp;
+} __packed;
+
+struct cw1200_ether_type_filter {
+ struct wsm_ether_type_filter_hdr hdr;
+ struct wsm_ether_type_filter ip;
+ struct wsm_ether_type_filter pae;
+ struct wsm_ether_type_filter wapi;
+} __packed;
+
+static struct cw1200_udp_port_filter cw1200_udp_port_filter_on = {
+ .hdr.nrFilters = 2,
+ .dhcp = {
+ .filterAction = WSM_FILTER_ACTION_FILTER_OUT,
+ .portType = WSM_FILTER_PORT_TYPE_DST,
+ .udpPort = __cpu_to_le16(67),
+ },
+ .upnp = {
+ .filterAction = WSM_FILTER_ACTION_FILTER_OUT,
+ .portType = WSM_FILTER_PORT_TYPE_DST,
+ .udpPort = __cpu_to_le16(1900),
+ },
+ /* Please add other known ports to be filtered out here and
+ * update nrFilters field in the header.
+ * Up to 4 filters are allowed. */
+};
+
+static struct wsm_udp_port_filter_hdr cw1200_udp_port_filter_off = {
+ .nrFilters = 0,
+};
+
+#ifndef ETH_P_WAPI
+#define ETH_P_WAPI 0x88B4
+#endif
+
+static struct cw1200_ether_type_filter cw1200_ether_type_filter_on = {
+ .hdr.nrFilters = 3,
+ .ip = {
+ .filterAction = WSM_FILTER_ACTION_FILTER_IN,
+ .etherType = __cpu_to_le16(ETH_P_IP),
+ },
+ .pae = {
+ .filterAction = WSM_FILTER_ACTION_FILTER_IN,
+ .etherType = __cpu_to_le16(ETH_P_PAE),
+ },
+ .wapi = {
+ .filterAction = WSM_FILTER_ACTION_FILTER_IN,
+ .etherType = __cpu_to_le16(ETH_P_WAPI),
+ },
+ /* Please add other known ether types to be filtered out here and
+ * update nrFilters field in the header.
+ * Up to 4 filters are allowed. */
+};
+
+static struct wsm_ether_type_filter_hdr cw1200_ether_type_filter_off = {
+ .nrFilters = 0,
+};
+
+static int cw1200_suspend_late(struct device *dev);
+static void cw1200_pm_release(struct device *dev);
+static int cw1200_pm_probe(struct platform_device *pdev);
+
+/* private */
+struct cw1200_suspend_state {
+ unsigned long bss_loss_tmo;
+ unsigned long connection_loss_tmo;
+ unsigned long join_tmo;
+ unsigned long direct_probe;
+ unsigned long link_id_gc;
+ bool beacon_skipping;
+};
+
+static const struct dev_pm_ops cw1200_pm_ops = {
+ .suspend_noirq = cw1200_suspend_late,
+};
+
+static struct platform_driver cw1200_power_driver = {
+ .probe = cw1200_pm_probe,
+ .driver = {
+ .name = "cw1200_power",
+ .pm = &cw1200_pm_ops,
+ },
+};
+
+static int cw1200_pm_init_common(struct cw1200_pm_state *pm,
+ struct cw1200_common *priv)
+{
+ int ret;
+
+ spin_lock_init(&pm->lock);
+ ret = platform_driver_register(&cw1200_power_driver);
+ if (ret)
+ return ret;
+ pm->pm_dev = platform_device_alloc("cw1200_power", 0);
+ if (!pm->pm_dev) {
+ platform_driver_unregister(&cw1200_power_driver);
+ return -ENOMEM;
+ }
+
+ pm->pm_dev->dev.platform_data = priv;
+ ret = platform_device_add(pm->pm_dev);
+ if (ret) {
+ kfree(pm->pm_dev);
+ pm->pm_dev = NULL;
+ }
+
+ return ret;
+}
+
+static void cw1200_pm_deinit_common(struct cw1200_pm_state *pm)
+{
+ platform_driver_unregister(&cw1200_power_driver);
+ if (pm->pm_dev) {
+ pm->pm_dev->dev.platform_data = NULL;
+ platform_device_unregister(pm->pm_dev);
+ pm->pm_dev = NULL;
+ }
+}
+
+#ifdef CONFIG_WAKELOCK
+
+int cw1200_pm_init(struct cw1200_pm_state *pm,
+ struct cw1200_common *priv)
+{
+ int ret = cw1200_pm_init_common(pm, priv);
+ if (!ret)
+ wake_lock_init(&pm->wakelock,
+ WAKE_LOCK_SUSPEND, "cw1200_wlan");
+ return ret;
+}
+
+void cw1200_pm_deinit(struct cw1200_pm_state *pm)
+{
+ if (wake_lock_active(&pm->wakelock))
+ wake_unlock(&pm->wakelock);
+ wake_lock_destroy(&pm->wakelock);
+ cw1200_pm_deinit_common(pm);
+}
+
+void cw1200_pm_stay_awake(struct cw1200_pm_state *pm,
+ unsigned long tmo)
+{
+ long cur_tmo;
+ spin_lock_bh(&pm->lock);
+ cur_tmo = pm->wakelock.ws.timer_expires - jiffies;
+ if (!wake_lock_active(&pm->wakelock) ||
+ cur_tmo < (long)tmo)
+ wake_lock_timeout(&pm->wakelock, tmo);
+ spin_unlock_bh(&pm->lock);
+}
+
+#else /* CONFIG_WAKELOCK */
+
+static void cw1200_pm_stay_awake_tmo(unsigned long arg)
+{
+}
+
+int cw1200_pm_init(struct cw1200_pm_state *pm,
+ struct cw1200_common *priv)
+{
+ int ret = cw1200_pm_init_common(pm, priv);
+ if (!ret) {
+ init_timer(&pm->stay_awake);
+ pm->stay_awake.data = (unsigned long)pm;
+ pm->stay_awake.function = cw1200_pm_stay_awake_tmo;
+ }
+ return ret;
+}
+
+void cw1200_pm_deinit(struct cw1200_pm_state *pm)
+{
+ del_timer_sync(&pm->stay_awake);
+ cw1200_pm_deinit_common(pm);
+}
+
+void cw1200_pm_stay_awake(struct cw1200_pm_state *pm,
+ unsigned long tmo)
+{
+ long cur_tmo;
+ spin_lock_bh(&pm->lock);
+ cur_tmo = pm->stay_awake.expires - jiffies;
+ if (!timer_pending(&pm->stay_awake) ||
+ cur_tmo < (long)tmo)
+ mod_timer(&pm->stay_awake, jiffies + tmo);
+ spin_unlock_bh(&pm->lock);
+}
+
+#endif /* CONFIG_WAKELOCK */
+
+static long cw1200_suspend_work(struct delayed_work *work)
+{
+ int ret = cancel_delayed_work(work);
+ long tmo;
+ if (ret > 0) {
+ /* Timer is pending */
+ tmo = work->timer.expires - jiffies;
+ if (tmo < 0)
+ tmo = 0;
+ } else {
+ tmo = -1;
+ }
+ return tmo;
+}
+
+static int cw1200_resume_work(struct cw1200_common *priv,
+ struct delayed_work *work,
+ unsigned long tmo)
+{
+ if ((long)tmo < 0)
+ return 1;
+
+ return queue_delayed_work(priv->workqueue, work, tmo);
+}
+
+static int cw1200_suspend_late(struct device *dev)
+{
+ struct cw1200_common *priv = dev->platform_data;
+ if (atomic_read(&priv->bh_rx)) {
+ wiphy_dbg(priv->hw->wiphy,
+ "%s: Suspend interrupted.\n",
+ __func__);
+ return -EAGAIN;
+ }
+ return 0;
+}
+
+static void cw1200_pm_release(struct device *dev)
+{
+}
+
+static int cw1200_pm_probe(struct platform_device *pdev)
+{
+ pdev->dev.release = cw1200_pm_release;
+ return 0;
+}
+
+int cw1200_wow_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
+{
+ struct cw1200_common *priv = hw->priv;
+ struct cw1200_pm_state *pm_state = &priv->pm_state;
+ struct cw1200_suspend_state *state;
+ int ret;
+
+#ifndef CONFIG_WAKELOCK
+ spin_lock_bh(&pm_state->lock);
+ ret = timer_pending(&pm_state->stay_awake);
+ spin_unlock_bh(&pm_state->lock);
+ if (ret)
+ return -EAGAIN;
+#endif
+
+ /* Do not suspend when datapath is not idle */
+ if (priv->tx_queue_stats.num_queued)
+ return -EBUSY;
+
+ /* Make sure there is no configuration requests in progress. */
+ if (!mutex_trylock(&priv->conf_mutex))
+ return -EBUSY;
+
+ /* Ensure pending operations are done.
+ * Note also that wow_suspend must return in ~2.5sec, before
+ * watchdog is triggered. */
+ if (priv->channel_switch_in_progress)
+ goto revert1;
+
+ /* Do not suspend when join work is scheduled */
+ if (work_pending(&priv->join_work))
+ goto revert1;
+
+ /* Do not suspend when scanning */
+ if (down_trylock(&priv->scan.lock))
+ goto revert1;
+
+ /* Lock TX. */
+ wsm_lock_tx_async(priv);
+
+ /* Wait to avoid possible race with bh code.
+ * But do not wait too long... */
+ if (wait_event_timeout(priv->bh_evt_wq,
+ !priv->hw_bufs_used, HZ / 10) <= 0)
+ goto revert2;
+
+ /* Set UDP filter */
+ wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_on.hdr);
+
+ /* Set ethernet frame type filter */
+ wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_on.hdr);
+
+ /* Allocate state */
+ state = kzalloc(sizeof(struct cw1200_suspend_state), GFP_KERNEL);
+ if (!state)
+ goto revert3;
+
+ /* Store delayed work states. */
+ state->bss_loss_tmo =
+ cw1200_suspend_work(&priv->bss_loss_work);
+ state->connection_loss_tmo =
+ cw1200_suspend_work(&priv->connection_loss_work);
+ state->join_tmo =
+ cw1200_suspend_work(&priv->join_timeout);
+ state->direct_probe =
+ cw1200_suspend_work(&priv->scan.probe_work);
+ state->link_id_gc =
+ cw1200_suspend_work(&priv->link_id_gc_work);
+
+ /* Enable beacon skipping */
+ if (priv->join_status == CW1200_JOIN_STATUS_STA
+ && priv->join_dtim_period
+ && !priv->has_multicast_subscription) {
+ state->beacon_skipping = true;
+ wsm_set_beacon_wakeup_period(priv,
+ priv->join_dtim_period,
+ CW1200_BEACON_SKIPPING_MULTIPLIER *
+ priv->join_dtim_period);
+ }
+
+ /* Stop serving thread */
+ if (cw1200_bh_suspend(priv))
+ goto revert4;
+
+ ret = timer_pending(&priv->mcast_timeout);
+ if (ret)
+ goto revert5;
+
+ /* Cancel block ack stat timer */
+ del_timer_sync(&priv->ba_timer);
+
+ /* Store suspend state */
+ pm_state->suspend_state = state;
+
+ /* Enable IRQ wake */
+ ret = priv->sbus_ops->power_mgmt(priv->sbus_priv, true);
+ if (ret) {
+ wiphy_err(priv->hw->wiphy,
+ "%s: PM request failed: %d. WoW is disabled.\n",
+ __func__, ret);
+ cw1200_wow_resume(hw);
+ return -EBUSY;
+ }
+
+ /* Force resume if event is coming from the device. */
+ if (atomic_read(&priv->bh_rx)) {
+ cw1200_wow_resume(hw);
+ return -EAGAIN;
+ }
+
+ return 0;
+
+revert5:
+ WARN_ON(cw1200_bh_resume(priv));
+revert4:
+ cw1200_resume_work(priv, &priv->bss_loss_work,
+ state->bss_loss_tmo);
+ cw1200_resume_work(priv, &priv->connection_loss_work,
+ state->connection_loss_tmo);
+ cw1200_resume_work(priv, &priv->join_timeout,
+ state->join_tmo);
+ cw1200_resume_work(priv, &priv->scan.probe_work,
+ state->direct_probe);
+ cw1200_resume_work(priv, &priv->link_id_gc_work,
+ state->link_id_gc);
+ kfree(state);
+revert3:
+ wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_off);
+ wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_off);
+revert2:
+ wsm_unlock_tx(priv);
+ up(&priv->scan.lock);
+revert1:
+ mutex_unlock(&priv->conf_mutex);
+ return -EBUSY;
+}
+
+int cw1200_wow_resume(struct ieee80211_hw *hw)
+{
+ struct cw1200_common *priv = hw->priv;
+ struct cw1200_pm_state *pm_state = &priv->pm_state;
+ struct cw1200_suspend_state *state;
+
+ state = pm_state->suspend_state;
+ pm_state->suspend_state = NULL;
+
+ /* Disable IRQ wake */
+ priv->sbus_ops->power_mgmt(priv->sbus_priv, false);
+
+ /* Resume BH thread */
+ WARN_ON(cw1200_bh_resume(priv));
+
+ if (state->beacon_skipping) {
+ wsm_set_beacon_wakeup_period(priv, priv->beacon_int *
+ priv->join_dtim_period >
+ MAX_BEACON_SKIP_TIME_MS ? 1 :
+ priv->join_dtim_period, 0);
+ state->beacon_skipping = false;
+ }
+
+ /* Resume delayed work */
+ cw1200_resume_work(priv, &priv->bss_loss_work,
+ state->bss_loss_tmo);
+ cw1200_resume_work(priv, &priv->connection_loss_work,
+ state->connection_loss_tmo);
+ cw1200_resume_work(priv, &priv->join_timeout,
+ state->join_tmo);
+ cw1200_resume_work(priv, &priv->scan.probe_work,
+ state->direct_probe);
+ cw1200_resume_work(priv, &priv->link_id_gc_work,
+ state->link_id_gc);
+
+ /* Restart block ack stat */
+ spin_lock_bh(&priv->ba_lock);
+ if (priv->ba_cnt)
+ mod_timer(&priv->ba_timer,
+ jiffies + CW1200_BLOCK_ACK_INTERVAL);
+ spin_unlock_bh(&priv->ba_lock);
+
+ /* Remove UDP port filter */
+ wsm_set_udp_port_filter(priv, &cw1200_udp_port_filter_off);
+
+ /* Remove ethernet frame type filter */
+ wsm_set_ether_type_filter(priv, &cw1200_ether_type_filter_off);
+
+ /* Unlock datapath */
+ wsm_unlock_tx(priv);
+
+ /* Unlock scan */
+ up(&priv->scan.lock);
+
+ /* Unlock configuration mutex */
+ mutex_unlock(&priv->conf_mutex);
+
+ /* Free memory */
+ kfree(state);
+
+ return 0;
+}
diff --git a/drivers/staging/cw1200/pm.h b/drivers/staging/cw1200/pm.h
new file mode 100644
index 0000000..10e314c
--- /dev/null
+++ b/drivers/staging/cw1200/pm.h
@@ -0,0 +1,49 @@
+/*
+ * Mac80211 power management interface for ST-Ericsson CW1200 mac80211 drivers
+ *
+ * Copyright (c) 2011, ST-Ericsson
+ * Author: Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef PM_H_INCLUDED
+#define PM_H_INCLUDED
+
+#ifdef CONFIG_WAKELOCK
+#include <linux/wakelock.h>
+#endif
+
+/* ******************************************************************** */
+/* mac80211 API */
+
+#ifdef CONFIG_CW1200_PM
+
+/* extern */ struct cw1200_common;
+/* private */ struct cw1200_suspend_state;
+
+struct cw1200_pm_state {
+ struct cw1200_suspend_state *suspend_state;
+#ifdef CONFIG_WAKELOCK
+ struct wake_lock wakelock;
+#else
+ struct timer_list stay_awake;
+#endif
+ struct platform_device *pm_dev;
+ spinlock_t lock;
+};
+
+int cw1200_pm_init(struct cw1200_pm_state *pm,
+ struct cw1200_common *priv);
+void cw1200_pm_deinit(struct cw1200_pm_state *pm);
+void cw1200_pm_stay_awake(struct cw1200_pm_state *pm,
+ unsigned long tmo);
+int cw1200_wow_suspend(struct ieee80211_hw *hw,
+ struct cfg80211_wowlan *wowlan);
+int cw1200_wow_resume(struct ieee80211_hw *hw);
+
+#endif /* CONFIG_CW1200_PM */
+
+#endif
--
1.7.11.7
--
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