2  * WPA Supplicant - background scan and roaming module: simple
17 #include "scan.h"
30 	int short_scan_count; /* counter for scans using short scan interval */
31 	int max_short_scans; /* maximum times we short-scan before back-off */
52 	/* Try BTM x times, scan on x + 1 */  in bgscan_simple_btm_query()
65 		/* Fall through and do regular scan */  in bgscan_simple_btm_query()
69 	/* Start a new timeout for the next one. We don't have scan callback to  in bgscan_simple_btm_query()
98 	wpa_printf(MSG_DEBUG, "bgscan simple: Request a background scan");  in bgscan_simple_timeout()
100 		wpa_printf(MSG_DEBUG, "bgscan simple: Failed to trigger scan");  in bgscan_simple_timeout()
110 					   "off to long scan interval");  in bgscan_simple_timeout()
114 			 * If we lasted a long scan interval without any  in bgscan_simple_timeout()
115 			 * CQM triggers, decrease the short-scan count,  in bgscan_simple_timeout()
116 			 * which allows 1 more short-scan interval to  in bgscan_simple_timeout()
142 		wpa_printf(MSG_ERROR, "bgscan simple: Missing scan interval "  in bgscan_simple_get_params()
193 		/* Poll for signal info to set initial scan interval */  in bgscan_simple_init()
199 	wpa_printf(MSG_DEBUG, "bgscan simple: Init scan interval: %d",  in bgscan_simple_init()
206 	 * reasonable to assume that a scan was completed recently. This makes  in bgscan_simple_init()
207 	 * us skip an immediate new scan in cases where the current signal  in bgscan_simple_init()
233 	wpa_printf(MSG_DEBUG, "bgscan simple: scan result notification");  in bgscan_simple_notify_scan()
240 	 * A more advanced bgscan could process scan results internally, select  in bgscan_simple_notify_scan()
263 	int scan = 0;  in bgscan_simple_notify_signal_change()  local
283 			 * performed a scan, and we haven't depleted our  in bgscan_simple_notify_signal_change()
284 			 * budget for short-scans, perform a scan  in bgscan_simple_notify_signal_change()
287 			scan = 1;  in bgscan_simple_notify_signal_change()
291 			 * Restart scan interval timer if currently scheduled  in bgscan_simple_notify_signal_change()
292 			 * scan is too far in the future.  in bgscan_simple_notify_signal_change()
309 		 * Signal dropped further 4 dB. Request a new scan if we have  in bgscan_simple_notify_signal_change()
314 			scan = 1;  in bgscan_simple_notify_signal_change()
317 	if (scan) {  in bgscan_simple_notify_signal_change()
318 		wpa_printf(MSG_DEBUG, "bgscan simple: Trigger immediate scan");  in bgscan_simple_notify_signal_change()