The code implements WoW mac80211 callbacks. The suspend strategy
is taken more form Android world, where reject of an ongoing suspend
is something quite normal. I understand that it is not a right
approach for vanilla Linux, where there is no retry in suspend.
TODO for differentiating suspend startegy is written. To be done
when bh is converted to a workqueue.
Signed-off-by: Dmitry Tarnyagin <dmitry.tarnyagin@xxxxxxxxxxxxxx>
---
drivers/staging/cw1200/pm.c | 421 +++++++++++++++++++++++++++++++++++++++++++
drivers/staging/cw1200/pm.h | 41 +++++
2 files changed, 462 insertions(+), 0 deletions(-)
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..1613efa
--- /dev/null
+++ b/drivers/staging/cw1200/pm.c
@@ -0,0 +1,421 @@
+/*
+ * 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;
+ }
+}
+
+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);
+}
+
+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;
+
+ spin_lock_bh(&pm_state->lock);
+ ret = timer_pending(&pm_state->stay_awake);
+ spin_unlock_bh(&pm_state->lock);
+ if (ret)
+ return -EAGAIN;
+
+ /* 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..36afe63
--- /dev/null
+++ b/drivers/staging/cw1200/pm.h
@@ -0,0 +1,41 @@
+/*
+ * 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
+
+/* ******************************************************************** */
+/* mac80211 API */
+
+#ifdef CONFIG_PM
+
+/* extern */ struct cw1200_common;
+/* private */ struct cw1200_suspend_state;
+
+struct cw1200_pm_state {
+ struct cw1200_suspend_state *suspend_state;
+ struct timer_list stay_awake;
+ 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_PM */
+
+#endif
--
1.7.9
--
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