P2P: Restore P2P_SCAN_SPECIFIC

This reverts commit 3df2f4fe99e18f7fb449477a63d13abb3ad4c891 ('P2P:
Remove unused P2P_SCAN_SPECIFIC') with a modification to fit the current
code base.

Signed-off-by: Daichi Ueura <daichi.ueura@sonymobile.com>

src/p2p/p2p.h

@@ -245,6 +245,7 @@ struct p2p_data;
 enum p2p_scan_type {
 	P2P_SCAN_SOCIAL,
 	P2P_SCAN_FULL,
+	P2P_SCAN_SPECIFIC,
 	P2P_SCAN_SOCIAL_PLUS_ONE
 };
 
@@ -545,7 +546,8 @@ struct p2p_config {
 	 * operation to be completed. Type type argument specifies which type
 	 * of scan is to be done. @P2P_SCAN_SOCIAL indicates that only the
 	 * social channels (1, 6, 11) should be scanned. @P2P_SCAN_FULL
-	 * indicates that all channels are to be scanned.
+	 * indicates that all channels are to be scanned. @P2P_SCAN_SPECIFIC
+	 * request a scan of a single channel specified by freq.
 	 * @P2P_SCAN_SOCIAL_PLUS_ONE request scan of all the social channels
 	 * plus one extra channel specified by freq.
 	 *

wpa_supplicant/p2p_supplicant.c

@@ -377,6 +377,13 @@ static int wpas_p2p_scan(void *ctx, enum p2p_scan_type type, int freq,
 		break;
 	case P2P_SCAN_FULL:
 		break;
+	case P2P_SCAN_SPECIFIC:
+		params->freqs = os_calloc(2, sizeof(int));
+		if (params->freqs == NULL)
+			goto fail;
+		params->freqs[0] = freq;
+		params->freqs[1] = 0;
+		break;
 	case P2P_SCAN_SOCIAL_PLUS_ONE:
 		params->freqs = os_calloc(ARRAY_SIZE(social_channels_freq) + 2,
 					  sizeof(int));