Add a simple periodic autoscan module

This module will sets a fixed scanning interval. Thus, the parameter to
this module is following this format: <fixed interval>

Signed-hostap: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>

wpa_supplicant/Android.mk

@@ -1310,6 +1310,12 @@ OBJS += autoscan_exponential.c
 NEED_AUTOSCAN=y
 endif
 
+ifdef CONFIG_AUTOSCAN_PERIODIC
+CFLAGS += -DCONFIG_AUTOSCAN_PERIODIC
+OBJS += autoscan_periodic.c
+NEED_AUTOSCAN=y
+endif
+
 ifdef NEED_AUTOSCAN
 L_CFLAGS += -DCONFIG_AUTOSCAN
 OBJS += autoscan.c

wpa_supplicant/Makefile

@@ -1327,6 +1327,12 @@ OBJS += autoscan_exponential.o
 NEED_AUTOSCAN=y
 endif
 
+ifdef CONFIG_AUTOSCAN_PERIODIC
+CFLAGS += -DCONFIG_AUTOSCAN_PERIODIC
+OBJS += autoscan_periodic.o
+NEED_AUTOSCAN=y
+endif
+
 ifdef NEED_AUTOSCAN
 CFLAGS += -DCONFIG_AUTOSCAN
 OBJS += autoscan.o

wpa_supplicant/autoscan.c

@@ -19,10 +19,17 @@
 extern const struct autoscan_ops autoscan_exponential_ops;
 #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */
 
+#ifdef CONFIG_AUTOSCAN_PERIODIC
+extern const struct autoscan_ops autoscan_periodic_ops;
+#endif /* CONFIG_AUTOSCAN_PERIODIC */
+
 static const struct autoscan_ops * autoscan_modules[] = {
 #ifdef CONFIG_AUTOSCAN_EXPONENTIAL
 	&autoscan_exponential_ops,
 #endif /* CONFIG_AUTOSCAN_EXPONENTIAL */
+#ifdef CONFIG_AUTOSCAN_PERIODIC
+	&autoscan_periodic_ops,
+#endif /* CONFIG_AUTOSCAN_PERIODIC */
 	NULL
 };
 

wpa_supplicant/autoscan_periodic.c

@@ -0,0 +1,85 @@
+/*
+ * WPA Supplicant - auto scan periodic module
+ * Copyright (c) 2012, Intel Corporation. All rights reserved.
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "wpa_supplicant_i.h"
+#include "autoscan.h"
+
+
+struct autoscan_periodic_data {
+	int periodic_interval;
+};
+
+
+static int autoscan_periodic_get_params(struct autoscan_periodic_data *data,
+					const char *params)
+{
+	int interval;
+
+	if (params == NULL)
+		return -1;
+
+	interval = atoi(params);
+
+	if (interval < 0)
+		return -1;
+
+	data->periodic_interval = interval;
+
+	return 0;
+}
+
+
+static void * autoscan_periodic_init(struct wpa_supplicant *wpa_s,
+				     const char *params)
+{
+	struct autoscan_periodic_data *data;
+
+	data = os_zalloc(sizeof(struct autoscan_periodic_data));
+	if (data == NULL)
+		return NULL;
+
+	if (autoscan_periodic_get_params(data, params) < 0) {
+		os_free(data);
+		return NULL;
+	}
+
+	wpa_printf(MSG_DEBUG, "autoscan periodic: interval is %d",
+		   data->periodic_interval);
+
+	return data;
+}
+
+
+static void autoscan_periodic_deinit(void *priv)
+{
+	struct autoscan_periodic_data *data = priv;
+
+	os_free(data);
+}
+
+
+static int autoscan_periodic_notify_scan(void *priv,
+					 struct wpa_scan_results *scan_res)
+{
+	struct autoscan_periodic_data *data = priv;
+
+	wpa_printf(MSG_DEBUG, "autoscan periodic: scan result notification");
+
+	return data->periodic_interval;
+}
+
+
+const struct autoscan_ops autoscan_periodic_ops = {
+	.name = "periodic",
+	.init = autoscan_periodic_init,
+	.deinit = autoscan_periodic_deinit,
+	.notify_scan = autoscan_periodic_notify_scan,
+};

wpa_supplicant/defconfig

@@ -508,3 +508,5 @@ CONFIG_PEERKEY=y
 # Enabling directly a module will enable autoscan support.
 # For exponential module:
 #CONFIG_AUTOSCAN_EXPONENTIAL=y
+# For periodic module:
+#CONFIG_AUTOSCAN_PERIODIC=y

wpa_supplicant/wpa_supplicant.conf

@@ -234,6 +234,9 @@ fast_reauth=1
 #autoscan=exponential:3:300
 # Which means a delay between scans on a base exponential of 3,
 # up to the limit of 300 seconds (3, 9, 27 ... 300)
+# For periodic module, parameters would be <fixed interval>
+#autoscan=periodic:30
+# So a delay of 30 seconds will be applied between each scan
 
 # filter_ssids - SSID-based scan result filtering
 # 0 = do not filter scan results (default)