cld: Handle cfg80211 suspend and resume

Two callbacks are exposed from HDD to CFG80211 layer to handle suspend
and resume. During cfg80211 suspend, Ongoing SCAN on each interface is
stopped and MC thread is moved to suspend state. During cfg80211 resume,
MC thread is resumed back.

Change-Id: I1e891c8a773ced2655dbae2ee655aee5332fccfe
CRs-Fixed: 540571

2 files changed, 87 insertions, 1 deletions

diff --git a/CORE/HDD/inc/wlan_hdd_main.h b/CORE/HDD/inc/wlan_hdd_main.h
index 3883033f987c..32a7d190f371 100644
--- a/CORE/HDD/inc/wlan_hdd_main.h
+++ b/CORE/HDD/inc/wlan_hdd_main.h
@@ -107,6 +107,13 @@
 #define WLAN_WAIT_TIME_SESSIONOPENCLOSE  15000
 #define WLAN_WAIT_TIME_ABORTSCAN  2000
 
+#ifdef QCA_WIFI_2_0
+
+/** Maximum time(ms) to wait for mc thread suspend **/
+#define WLAN_WAIT_TIME_MCTHREAD_SUSPEND  1200
+
+#endif
+
 /** Maximum time(ms) to wait for tdls add sta to complete **/
 #define WAIT_TIME_TDLS_ADD_STA      1500
 
diff --git a/CORE/HDD/src/wlan_hdd_cfg80211.c b/CORE/HDD/src/wlan_hdd_cfg80211.c
index 42f827695062..7b5392aa4906 100644
--- a/CORE/HDD/src/wlan_hdd_cfg80211.c
+++ b/CORE/HDD/src/wlan_hdd_cfg80211.c
@@ -91,7 +91,9 @@
 #include "wlan_hdd_tdls.h"
 #endif
 #include "wlan_nv.h"
-
+#ifdef QCA_WIFI_2_0
+#include "vos_sched.h"
+#endif
 #if defined(QCA_WIFI_2_0) && defined(QCA_WIFI_FTM) && !defined(QCA_WIFI_ISOC)
 #include "testmode.h"
 #endif
@@ -8227,6 +8229,79 @@ static int wlan_hdd_cfg80211_set_mac_acl(struct wiphy *wiphy,
 }
 #endif
 
+#ifdef QCA_WIFI_2_0
+int wlan_hdd_cfg80211_suspend_wlan(struct wiphy *wiphy,
+                                   struct cfg80211_wowlan *wow)
+{
+    hdd_context_t *pHddCtx = wiphy_priv(wiphy);
+    pVosSchedContext vosSchedContext = get_vos_sched_ctxt();
+    hdd_adapter_list_node_t *pAdapterNode = NULL, *pNext = NULL;
+    hdd_adapter_t *pAdapter;
+    hdd_scaninfo_t *pScanInfo;
+    VOS_STATUS status;
+    int rc;
+
+    /* Stop ongoing scan on each interface */
+    status =  hdd_get_front_adapter ( pHddCtx, &pAdapterNode );
+    while ( NULL != pAdapterNode && VOS_STATUS_SUCCESS == status )
+    {
+        pAdapter = pAdapterNode->pAdapter;
+        pScanInfo = &pAdapter->scan_info;
+
+        if (pScanInfo->mScanPending && pAdapter->request)
+        {
+           INIT_COMPLETION(pScanInfo->abortscan_event_var);
+           hdd_abort_mac_scan(pHddCtx, pAdapter->sessionId);
+
+           status = wait_for_completion_interruptible_timeout(
+                           &pScanInfo->abortscan_event_var,
+                           msecs_to_jiffies(WLAN_WAIT_TIME_ABORTSCAN));
+           if (!status)
+           {
+              VOS_TRACE( VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
+                         "%s: Timeout occurred while waiting for abort scan" ,
+                         __func__);
+              return -ETIME;
+           }
+        }
+        status = hdd_get_next_adapter ( pHddCtx, pAdapterNode, &pNext );
+        pAdapterNode = pNext;
+    }
+
+    /* Suspend MC thread */
+    set_bit(MC_SUSPEND_EVENT_MASK, &vosSchedContext->mcEventFlag);
+    wake_up_interruptible(&vosSchedContext->mcWaitQueue);
+
+    /* Wait for suspend confirmation from MC thread */
+    rc = wait_for_completion_interruptible_timeout(&pHddCtx->mc_sus_event_var,
+                                 msecs_to_jiffies(WLAN_WAIT_TIME_MCTHREAD_SUSPEND));
+    if (!rc)
+    {
+        clear_bit(MC_SUSPEND_EVENT_MASK, &vosSchedContext->mcEventFlag);
+        VOS_TRACE( VOS_MODULE_ID_HDD, VOS_TRACE_LEVEL_ERROR,
+                   "%s: Failed to stop mc thread", __func__);
+        return -ETIME;
+    }
+
+    pHddCtx->isMcThreadSuspended = TRUE;
+
+    return 0;
+}
+
+int wlan_hdd_cfg80211_resume_wlan(struct wiphy *wiphy)
+{
+    hdd_context_t *pHddCtx = wiphy_priv(wiphy);
+    pVosSchedContext vosSchedContext = get_vos_sched_ctxt();
+
+    /* Resume MC thread */
+    complete(&vosSchedContext->ResumeMcEvent);
+
+    pHddCtx->isMcThreadSuspended = FALSE;
+
+    return 0;
+}
+#endif
+
 /* cfg80211_ops */
 static struct cfg80211_ops wlan_hdd_cfg80211_ops =
 {
@@ -8297,5 +8372,9 @@ static struct cfg80211_ops wlan_hdd_cfg80211_ops =
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0))
      .set_mac_acl = wlan_hdd_cfg80211_set_mac_acl,
 #endif
+#ifdef QCA_WIFI_2_0
+     .suspend = wlan_hdd_cfg80211_suspend_wlan,
+     .resume = wlan_hdd_cfg80211_resume_wlan,
+#endif
 };