Add scheduled scan driver operations

In new Linux kernel versions (>=3.0), nl80211 adds scheduled scan
capability. In order to use this feature to its full extent, we need
to support it in the wpa_supplicant core, so that it can also be used
by other drivers.

This commit adds initial scheduled scan support operations and events.

Signed-off-by: Luciano Coelho <coelho@ti.com>

src/drivers/driver.h

@@ -694,6 +694,8 @@ struct wpa_driver_capa {
 	unsigned int flags;
 
 	int max_scan_ssids;
+	int max_sched_scan_ssids;
+	int sched_scan_supported;
 
 	/**
 	 * max_remain_on_chan - Maximum remain-on-channel duration in msec
@@ -2455,6 +2457,35 @@ struct wpa_driver_ops {
 	 * the station gets added by FT-over-DS.
 	 */
 	int (*add_sta_node)(void *priv, const u8 *addr, u16 auth_alg);
+
+	/**
+	 * sched_scan - Request the driver to initiate scheduled scan
+	 * @priv: Private driver interface data
+	 * @params: Scan parameters
+	 * @interval: Interval between scan cycles in milliseconds
+	 * Returns: 0 on success, -1 on failure
+	 *
+	 * This operation should be used for scheduled scan offload to
+	 * the hardware. Every time scan results are available, the
+	 * driver should report scan results event for wpa_supplicant
+	 * which will eventually request the results with
+	 * wpa_driver_get_scan_results2(). This operation is optional
+	 * and if not provided or if it returns -1, we fall back to
+	 * normal host-scheduled scans.
+	 */
+	int (*sched_scan)(void *priv, struct wpa_driver_scan_params *params,
+			  u32 interval);
+
+	/**
+	 * stop_sched_scan - Request the driver to stop a scheduled scan
+	 * @priv: Private driver interface data
+	 * Returns: 0 on success, -1 on failure
+	 *
+	 * This should cause the scheduled scan to be stopped and
+	 * results should stop being sent. Must be supported if
+	 * sched_scan is supported.
+	 */
+	int (*stop_sched_scan)(void *priv);
 };
 
 
@@ -2867,7 +2898,12 @@ enum wpa_event_type {
 	 * completed Group Key Handshake while the host (including
 	 * wpa_supplicant was sleeping).
 	 */
-	EVENT_DRIVER_GTK_REKEY
+	EVENT_DRIVER_GTK_REKEY,
+
+	/**
+	 * EVENT_SCHED_SCAN_STOPPED - Scheduled scan was stopped
+	 */
+	EVENT_SCHED_SCAN_STOPPED
 };
 
 

src/drivers/driver_ndis.c

@@ -3331,5 +3331,7 @@ const struct wpa_driver_ops wpa_driver_ndis_ops = {
 	NULL /* sta_assoc */,
 	NULL /* sta_auth */,
 	NULL /* add_tspec */,
-	NULL /* add_sta_node */
+	NULL /* add_sta_node */,
+	NULL /* sched_scan */,
+	NULL /* stop_sched_scan */
 };