From 338e1f465738acec2d2ca5f9ef2d390456a5d752 Mon Sep 17 00:00:00 2001
From: Chih-Wei Huang <cwhuang@linux.org.tw>
Date: Wed, 7 Sep 2016 02:44:44 +0800
Subject: [PATCH] Unload/reload wifi driver on suspend/resume

---
 Android.mk |  2 +-
 power.c    | 22 ++++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/Android.mk b/Android.mk
index 7dd518b..469a4ee 100644
--- a/Android.mk
+++ b/Android.mk
@@ -15,7 +15,7 @@ include $(CLEAR_VARS)
 LOCAL_MODULE := power.x86
 LOCAL_MODULE_RELATIVE_PATH := hw
 LOCAL_SRC_FILES := power.c
-LOCAL_SHARED_LIBRARIES := liblog
+LOCAL_SHARED_LIBRARIES := liblog libcutils
 LOCAL_MODULE_TAGS := optional
 
 include $(BUILD_SHARED_LIBRARY)
diff --git a/power.c b/power.c
index 845e0a2..328a2e0 100644
--- a/power.c
+++ b/power.c
@@ -21,6 +21,10 @@
 
 #include <hardware/hardware.h>
 #include <hardware/power.h>
+#include <cutils/properties.h>
+#include <cutils/probe_module.h>
+
+extern int delete_module(const char *, unsigned int);
 
 #define SYS_CPU "/sys/devices/system/cpu"
 #define CPU_ONLINE "1"
@@ -51,6 +55,24 @@ static void power_init(struct power_module *module)
 
 static void power_set_interactive(struct power_module *module, int on)
 {
+    char mod[PROPERTY_VALUE_MAX];
+    if ((!property_get("wlan.no-unload-driver", mod, NULL) || strcmp(mod, "1"))
+            && property_get("wlan.modname", mod, NULL)) {
+        if (on) {
+            if (insmod_by_dep(mod, "", NULL, 0, NULL)) {
+                ALOGE("insmod %s failed", mod);
+            } else {
+                ALOGD("reload %s OK", mod);
+            }
+        } else {
+            if (delete_module(mod, O_NONBLOCK)) {
+                ALOGE("rmmod %s failed", mod);
+            } else {
+                ALOGD("unload %s OK", mod);
+            }
+        }
+    }
+
     set_nonboot_cpu_state(on ? CPU_ONLINE : CPU_OFFLINE);
 }
 
-- 
2.11.0