brcmfmac: introduce scheduled scan support

This change add support for NL80211 scheduled scan. This may be used to
offload scanning to the device, which may give the host opportunity to
sleep. The newer versions of wpa_supplicant have support for this
functionality.
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.h

@@ -295,6 +295,87 @@ struct escan_info {
 	struct net_device *ndev;
 };
 
+/**
+ * struct brcmf_pno_param_le - PNO scan configuration parameters
+ *
+ * @version: PNO parameters version.
+ * @scan_freq: scan frequency.
+ * @lost_network_timeout: #sec. to declare discovered network as lost.
+ * @flags: Bit field to control features of PFN such as sort criteria auto
+ *	enable switch and background scan.
+ * @rssi_margin: Margin to avoid jitter for choosing a PFN based on RSSI sort
+ *	criteria.
+ * @bestn: number of best networks in each scan.
+ * @mscan: number of scans recorded.
+ * @repeat: minimum number of scan intervals before scan frequency changes
+ *	in adaptive scan.
+ * @exp: exponent of 2 for maximum scan interval.
+ * @slow_freq: slow scan period.
+ */
+struct brcmf_pno_param_le {
+	__le32 version;
+	__le32 scan_freq;
+	__le32 lost_network_timeout;
+	__le16 flags;
+	__le16 rssi_margin;
+	u8 bestn;
+	u8 mscan;
+	u8 repeat;
+	u8 exp;
+	__le32 slow_freq;
+};
+
+/**
+ * struct brcmf_pno_net_param_le - scan parameters per preferred network.
+ *
+ * @ssid: ssid name and its length.
+ * @flags: bit2: hidden.
+ * @infra: BSS vs IBSS.
+ * @auth: Open vs Closed.
+ * @wpa_auth: WPA type.
+ * @wsec: wsec value.
+ */
+struct brcmf_pno_net_param_le {
+	struct brcmf_ssid_le ssid;
+	__le32 flags;
+	__le32 infra;
+	__le32 auth;
+	__le32 wpa_auth;
+	__le32 wsec;
+};
+
+/**
+ * struct brcmf_pno_net_info_le - information per found network.
+ *
+ * @bssid: BSS network identifier.
+ * @channel: channel number only.
+ * @SSID_len: length of ssid.
+ * @SSID: ssid characters.
+ * @RSSI: receive signal strength (in dBm).
+ * @timestamp: age in seconds.
+ */
+struct brcmf_pno_net_info_le {
+	u8 bssid[ETH_ALEN];
+	u8 channel;
+	u8 SSID_len;
+	u8 SSID[32];
+	__le16	RSSI;
+	__le16	timestamp;
+};
+
+/**
+ * struct brcmf_pno_scanresults_le - result returned in PNO NET FOUND event.
+ *
+ * @version: PNO version identifier.
+ * @status: indicates completion status of PNO scan.
+ * @count: amount of brcmf_pno_net_info_le entries appended.
+ */
+struct brcmf_pno_scanresults_le {
+	__le32 version;
+	__le32 status;
+	__le32 count;
+};
+
 /* dongle private data of cfg80211 interface */
 struct brcmf_cfg80211_priv {
 	struct wireless_dev *wdev;	/* representing wl cfg80211 device */
@@ -325,6 +406,7 @@ struct brcmf_cfg80211_priv {
 	bool iscan_on;		/* iscan on/off switch */
 	bool iscan_kickstart;	/* indicate iscan already started */
 	bool active_scan;	/* current scan mode */
+	bool sched_escan;	/* e-scan for scheduled scan support running */
 	bool ibss_starter;	/* indicates this sta is ibss starter */
 	bool link_up;		/* link/connection up flag */
 	bool pwr_save;		/* indicate whether dongle to support