driver: wifi: siwx91x: Add support for BG Scan

- Added support for background scan
  and configured the default values
  of BG scan configuration

Signed-off-by: Nitin Pandey <[email protected]>

Author: nipandey-01

drivers/wifi/siwx91x/Kconfig.siwx91x

@@ -45,6 +45,70 @@ config NET_MGMT_EVENT_STACK_SIZE
 config NET_MGMT_EVENT_QUEUE_SIZE
 	default 10
 
+
+config WIFI_SILABS_SIWX91X_ADV_SCAN_THRESHOLD
+	int "Advanced scan threshold (in dBm)"
+	default -40
+	help
+	  Configure the default advanced scan threshold for WiFi scanning.
+	  This value determines the signal strength (in dBm) below which
+	  the advanced scan mechanism will be triggered. Adjust this value
+	  to optimize scanning behavior based on your network environment.
+
+config WIFI_SILABS_SIWX91X_ADV_RSSI_TOLERANCE_THRESHOLD
+	int "Advanced RSSI tolerance threshold (in dBm)"
+	default 5
+	help
+	  Configure the default RSSI tolerance threshold for advanced WiFi scanning.
+	  This value determines the acceptable variation in signal strength (in dBm)
+	  during advanced scanning. Adjust this value to fine-tune the sensitivity
+	  of the scanning mechanism to signal fluctuations.
+
+config WIFI_SILABS_SIWX91X_ADV_ACTIVE_SCAN_DURATION
+	int "Advanced active scan duration (in ms)"
+	default 15
+	help
+	  Configure the default advanced active scan duration for WiFi scanning.
+	  This value determines the time (in milliseconds) spent on each
+	  channel during an advanced active scan. Adjust this value to optimize
+	  scanning speed and accuracy based on your network environment.
+
+config WIFI_SILABS_SIWX91X_ADV_PASSIVE_SCAN_DURATION
+	int "Advanced passive scan duration (in ms)"
+	default 20
+	help
+	  Configure the default advanced passive scan duration for WiFi scanning.
+	  This value determines the time (in milliseconds) spent on each
+	  channel during an advanced passive scan. Adjust this value to optimize
+	  scanning speed and accuracy based on your network environment.
+
+config WIFI_SILABS_SIWX91X_ADV_MULTIPROBE
+	int "Advanced multiprobe setting"
+	default 0
+	help
+	  Configure the advanced multiprobe setting for WiFi scanning.
+	  When set to 1, multiple probe requests will be sent to all access
+	  points in addition to the connected SSID during scanning. Adjust
+	  this value to fine-tune scanning behavior based on your network
+	  requirements.
+
+config WIFI_SILABS_SIWX91X_ADV_SCAN_PERIODICITY
+	int "Advanced scan periodicity (in ms)"
+	default 10
+	help
+	  Configure the default advanced scan periodicity for WiFi scanning.
+	  This value determines the interval (in milliseconds) between consecutive
+	  advanced scans. Adjust this value to balance scanning frequency
+	  and power consumption based on your network environment.
+
+config WIFI_SILABS_SIWX91X_ENABLE_INSTANT_SCAN
+	int "Instant scan support"
+	default 1
+	help
+	  Enable support to start an advanced scan immediately. When enabled, the device
+	  can perform an advanced scan without waiting for the periodic
+	  scan interval, enabling quicker detection of available networks.
+
 # Override the WIFI_MGMT_SCAN_SSID_FILT_MAX parameter for the Wi-Fi subsystem.
 # This device supports filtering scan results for only one SSID.
 config WIFI_MGMT_SCAN_SSID_FILT_MAX

drivers/wifi/siwx91x/siwx91x_wifi.c

@@ -479,6 +479,12 @@ static int siwx91x_scan(const struct device *dev, struct wifi_scan_params *z_sca
 			scan_result_cb_t cb)
 {
 	sl_wifi_scan_configuration_t sl_scan_config = { };
+	sl_wifi_advanced_scan_configuration_t advanced_scan_config = {
+		.trigger_level = CONFIG_WIFI_SILABS_SIWX91X_ADV_SCAN_THRESHOLD,
+		.trigger_level_change = CONFIG_WIFI_SILABS_SIWX91X_ADV_RSSI_TOLERANCE_THRESHOLD,
+		.enable_multi_probe = CONFIG_WIFI_SILABS_SIWX91X_ADV_MULTIPROBE,
+		.enable_instant_scan = CONFIG_WIFI_SILABS_SIWX91X_ENABLE_INSTANT_SCAN,
+	};
 	struct siwx91x_dev *sidev = dev->data;
 	sl_wifi_interface_t interface;
 	sl_wifi_ssid_t ssid = { };
@@ -503,17 +509,22 @@ static int siwx91x_scan(const struct device *dev, struct wifi_scan_params *z_sca
 		return -EINVAL;
 	}
 
-	if (z_scan_config->scan_type == WIFI_SCAN_TYPE_ACTIVE) {
-		sl_scan_config.type = SL_WIFI_SCAN_TYPE_ACTIVE;
-		ret = sl_si91x_configure_timeout(SL_SI91X_CHANNEL_ACTIVE_SCAN_TIMEOUT,
-						 z_scan_config->dwell_time_active);
+	if (sidev->state == WIFI_STATE_COMPLETED) {
+		ret = sl_wifi_set_advanced_scan_configuration(&advanced_scan_config);
+		if (ret != SL_STATUS_OK) {
+			LOG_ERR("advanced scan configuration failed with status %x", ret);
+			return -EINVAL;
+		}
+
+		sl_scan_config.type = SL_WIFI_SCAN_TYPE_ADV_SCAN;
+		sl_scan_config.periodic_scan_interval =
+			CONFIG_WIFI_SILABS_SIWX91X_ADV_SCAN_PERIODICITY;
 	} else {
-		sl_scan_config.type = SL_WIFI_SCAN_TYPE_PASSIVE;
-		ret = sl_si91x_configure_timeout(SL_SI91X_CHANNEL_PASSIVE_SCAN_TIMEOUT,
-						 z_scan_config->dwell_time_passive);
-	}
-	if (ret) {
-		return -EINVAL;
+		if (z_scan_config->scan_type == WIFI_SCAN_TYPE_ACTIVE) {
+			sl_scan_config.type = SL_WIFI_SCAN_TYPE_ACTIVE;
+		} else {
+			sl_scan_config.type = SL_WIFI_SCAN_TYPE_PASSIVE;
+		}
 	}
 
 	for (int i = 0; i < ARRAY_SIZE(z_scan_config->band_chan); i++) {