brcmfmac: add peer-to-peer group discovery support

First part for P2P support. It is a variation on the existing
scanning functionality and is used to discover peer-to-peer
group owners and/or peer-to-peer devices in listen state.

Tested with wpa_cli/wpa_supplicant v2.0-devel.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@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>

1 files changed, 734 insertions, 0 deletions

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/p2p.c b/drivers/net/wireless/brcm80211/brcmfmac/p2p.c
new file mode 100644
index 000000000000..22d9de81e08f
--- /dev/null
+++ b/drivers/net/wireless/brcm80211/brcmfmac/p2p.c
@@ -0,0 +1,734 @@
+/*
+ * Copyright (c) 2012 Broadcom Corporation
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+#include <linux/slab.h>
+#include <linux/netdevice.h>
+#include <net/cfg80211.h>
+
+#include <brcmu_wifi.h>
+#include <brcmu_utils.h>
+#include <defs.h>
+#include <dhd.h>
+#include <dhd_dbg.h>
+#include "fwil.h"
+#include "p2p.h"
+#include "wl_cfg80211.h"
+
+/* parameters used for p2p escan */
+#define P2PAPI_SCAN_NPROBES 1
+#define P2PAPI_SCAN_DWELL_TIME_MS 80
+#define P2PAPI_SCAN_SOCIAL_DWELL_TIME_MS 40
+#define P2PAPI_SCAN_HOME_TIME_MS 60
+#define P2PAPI_SCAN_NPROBS_TIME_MS 30
+#define P2PAPI_SCAN_AF_SEARCH_DWELL_TIME_MS 100
+#define WL_SCAN_CONNECT_DWELL_TIME_MS 200
+#define WL_SCAN_JOIN_PROBE_INTERVAL_MS 20
+
+#define BRCMF_P2P_WILDCARD_SSID		"DIRECT-"
+#define BRCMF_P2P_WILDCARD_SSID_LEN	(sizeof(BRCMF_P2P_WILDCARD_SSID) - 1)
+
+#define SOCIAL_CHAN_1		1
+#define SOCIAL_CHAN_2		6
+#define SOCIAL_CHAN_3		11
+#define SOCIAL_CHAN_CNT		3
+#define AF_PEER_SEARCH_CNT	2
+
+/**
+ * struct brcmf_p2p_disc_st_le - set discovery state in firmware.
+ *
+ * @state: requested discovery state (see enum brcmf_p2p_disc_state).
+ * @chspec: channel parameter for %WL_P2P_DISC_ST_LISTEN state.
+ * @dwell: dwell time in ms for %WL_P2P_DISC_ST_LISTEN state.
+ */
+struct brcmf_p2p_disc_st_le {
+	u8 state;
+	__le16 chspec;
+	__le16 dwell;
+};
+
+/**
+ * enum brcmf_p2p_disc_state - P2P discovery state values
+ *
+ * @WL_P2P_DISC_ST_SCAN: P2P discovery with wildcard SSID and P2P IE.
+ * @WL_P2P_DISC_ST_LISTEN: P2P discovery off-channel for specified time.
+ * @WL_P2P_DISC_ST_SEARCH: P2P discovery with P2P wildcard SSID and P2P IE.
+ */
+enum brcmf_p2p_disc_state {
+	WL_P2P_DISC_ST_SCAN,
+	WL_P2P_DISC_ST_LISTEN,
+	WL_P2P_DISC_ST_SEARCH
+};
+
+/**
+ * struct brcmf_p2p_scan_le - P2P specific scan request.
+ *
+ * @type: type of scan method requested (values: 'E' or 'S').
+ * @reserved: reserved (ignored).
+ * @eparams: parameters used for type 'E'.
+ * @sparams: parameters used for type 'S'.
+ */
+struct brcmf_p2p_scan_le {
+	u8 type;
+	u8 reserved[3];
+	union {
+		struct brcmf_escan_params_le eparams;
+		struct brcmf_scan_params_le sparams;
+	};
+};
+
+static struct brcmf_cfg80211_vif *p2p_discover_vif(struct brcmf_p2p_info *p2p)
+{
+	return p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
+}
+
+/**
+ * brcmf_p2p_set_firmware() - prepare firmware for peer-to-peer operation.
+ *
+ * @p2p: P2P specific data.
+ */
+static int brcmf_p2p_set_firmware(struct brcmf_p2p_info *p2p)
+{
+	struct net_device *ndev = cfg_to_ndev(p2p->cfg);
+	u8 null_eth_addr[] = { 0, 0, 0, 0, 0, 0 };
+	s32 ret = 0;
+
+	brcmf_fil_iovar_int_set(netdev_priv(ndev), "apsta", 1);
+
+	/* In case of COB type, firmware has default mac address
+	 * After Initializing firmware, we have to set current mac address to
+	 * firmware for P2P device address
+	 */
+	ret = brcmf_fil_iovar_data_set(netdev_priv(ndev), "p2p_da_override",
+				       null_eth_addr, sizeof(null_eth_addr));
+	if (ret)
+		brcmf_err("failed to update device address ret %d\n", ret);
+
+	return ret;
+}
+
+/**
+ * brcmf_p2p_generate_bss_mac() - derive mac addresses for P2P.
+ *
+ * @p2p: P2P specific data.
+ *
+ * P2P needs mac addresses for P2P device and interface. These are
+ * derived from the primary net device, ie. the permanent ethernet
+ * address of the device.
+ */
+static void brcmf_p2p_generate_bss_mac(struct brcmf_p2p_info *p2p)
+{
+	struct net_device *ndev = cfg_to_ndev(p2p->cfg);
+
+	/* Generate the P2P Device Address.  This consists of the device's
+	 * primary MAC address with the locally administered bit set.
+	 */
+	memcpy(p2p->dev_addr, ndev->dev_addr, ETH_ALEN);
+	p2p->dev_addr[0] |= 0x02;
+
+	/* Generate the P2P Interface Address.  If the discovery and connection
+	 * BSSCFGs need to simultaneously co-exist, then this address must be
+	 * different from the P2P Device Address, but also locally administered.
+	 */
+	memcpy(p2p->int_addr, p2p->dev_addr, ETH_ALEN);
+	p2p->int_addr[4] ^= 0x80;
+}
+
+/**
+ * brcmf_p2p_scan_is_p2p_request() - is cfg80211 scan request a P2P scan.
+ *
+ * @request: the scan request as received from cfg80211.
+ *
+ * returns true if one of the ssids in the request matches the
+ * P2P wildcard ssid; otherwise returns false.
+ */
+static bool brcmf_p2p_scan_is_p2p_request(struct cfg80211_scan_request *request)
+{
+	struct cfg80211_ssid *ssids = request->ssids;
+	int i;
+
+	for (i = 0; i < request->n_ssids; i++) {
+		if (ssids[i].ssid_len != BRCMF_P2P_WILDCARD_SSID_LEN)
+			continue;
+
+		brcmf_dbg(INFO, "comparing ssid \"%s\"", ssids[i].ssid);
+		if (!memcmp(BRCMF_P2P_WILDCARD_SSID, ssids[i].ssid,
+			    BRCMF_P2P_WILDCARD_SSID_LEN))
+			return true;
+	}
+	return false;
+}
+
+/**
+ * brcmf_p2p_set_discover_state - set discover state in firmware.
+ *
+ * @ifp: low-level interface object.
+ * @state: discover state to set.
+ * @chanspec: channel parameters (for state @WL_P2P_DISC_ST_LISTEN only).
+ * @listen_ms: duration to listen (for state @WL_P2P_DISC_ST_LISTEN only).
+ */
+static s32 brcmf_p2p_set_discover_state(struct brcmf_if *ifp, u8 state,
+					u16 chanspec, u16 listen_ms)
+{
+	struct brcmf_p2p_disc_st_le discover_state;
+	s32 ret = 0;
+	brcmf_dbg(TRACE, "enter\n");
+
+	discover_state.state = state;
+	discover_state.chspec = cpu_to_le16(chanspec);
+	discover_state.dwell = cpu_to_le16(listen_ms);
+	ret = brcmf_fil_bsscfg_data_set(ifp, "p2p_state", &discover_state,
+					sizeof(discover_state));
+	return ret;
+}
+
+/**
+ * brcmf_p2p_discover_disable_search() - reset discover state.
+ *
+ * @p2p: P2P specific data.
+ *
+ * Reset the discover state to @WL_P2P_DISC_ST_SCAN. Returns 0 on success.
+ */
+static s32 brcmf_p2p_discover_disable_search(struct brcmf_p2p_info *p2p)
+{
+	struct brcmf_cfg80211_vif *vif = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
+	struct brcmf_p2p_disc_st_le discovery_mode;
+	int ret;
+
+	/*
+	 * vif presence indicates discovery is initialized.
+	 */
+	if (!vif)
+		return -ENODEV;
+
+	ret = brcmf_fil_bsscfg_data_get(vif->ifp, "p2p_state",
+					&discovery_mode,
+					sizeof(discovery_mode));
+	if (!ret && discovery_mode.state != WL_P2P_DISC_ST_SCAN)
+		ret = brcmf_p2p_set_discover_state(vif->ifp,
+						  WL_P2P_DISC_ST_SCAN, 0, 0);
+	return ret;
+}
+
+/**
+ * brcmf_p2p_init_discovery() - enable discovery in the firmware.
+ *
+ * @p2p: P2P specific data.
+ *
+ * Configures the firmware to allow P2P peer discovery. Creates the
+ * virtual interface and consequently the P2P device for it.
+ */
+static s32 brcmf_p2p_init_discovery(struct brcmf_p2p_info *p2p)
+{
+	struct net_device *ndev = cfg_to_ndev(p2p->cfg);
+	struct brcmf_cfg80211_vif *vif;
+	struct brcmf_if *ifp;
+	struct p2p_bss *bss_dev;
+	s32 index;
+	s32 ret;
+
+	brcmf_dbg(TRACE, "enter\n");
+
+	bss_dev = &p2p->bss_idx[P2PAPI_BSSCFG_DEVICE];
+	if (bss_dev->vif != NULL) {
+		brcmf_dbg(INFO, "do nothing, already initialized\n");
+		return 0;
+	}
+
+	/* Enable P2P Discovery in the firmware */
+	ret = brcmf_fil_iovar_int_set(netdev_priv(ndev), "p2p_disc", 1);
+	if (ret < 0) {
+		brcmf_err("set discover error\n");
+		return ret;
+	}
+
+	/* obtain bsscfg index for P2P discovery */
+	ret = brcmf_fil_iovar_int_get(netdev_priv(ndev), "p2p_dev", &index);
+	if (ret < 0) {
+		brcmf_err("retrieving discover bsscfg index failed\n");
+		return ret;
+	}
+
+	/*
+	 * need brcmf_if for setting the discovery state.
+	 */
+	ifp = kzalloc(sizeof(*vif->ifp), GFP_KERNEL);
+	if (!ifp) {
+		brcmf_err("could not create discovery if\n");
+		return -ENOMEM;
+	}
+
+	/* set required fields */
+	ifp->drvr = p2p->cfg->pub;
+	ifp->ifidx = 0;
+	ifp->bssidx = index;
+
+	/* Set the initial discovery state to SCAN */
+	ret = brcmf_p2p_set_discover_state(ifp, WL_P2P_DISC_ST_SCAN, 0, 0);
+
+	if (ret != 0) {
+		brcmf_err("unable to set WL_P2P_DISC_ST_SCAN\n");
+		(void)brcmf_fil_iovar_int_set(netdev_priv(ndev), "p2p_disc", 0);
+		kfree(ifp);
+		return ret;
+	}
+
+	/* create a vif for it */
+	vif = brcmf_alloc_vif(p2p->cfg, NULL, NL80211_IFTYPE_P2P_DEVICE, false);
+	if (IS_ERR(vif)) {
+		brcmf_err("could not create discovery vif\n");
+		kfree(ifp);
+		return PTR_ERR(vif);
+	}
+
+	vif->ifp = ifp;
+	ifp->vif = vif;
+	bss_dev->vif = vif;
+
+	return 0;
+}
+
+/**
+ * brcmf_p2p_deinit_discovery() - disable P2P device discovery.
+ *
+ * @p2p: P2P specific data.
+ *
+ * Resets the discovery state and disables it in firmware. The virtual
+ * interface and P2P device are freed.
+ */
+static s32 brcmf_p2p_deinit_discovery(struct brcmf_p2p_info *p2p)
+{
+	struct net_device *ndev = cfg_to_ndev(p2p->cfg);
+	struct brcmf_if *ifp;
+	struct p2p_bss *bss_dev;
+	brcmf_dbg(TRACE, "enter\n");
+
+	bss_dev = &p2p->bss_idx[P2PAPI_BSSCFG_DEVICE];
+	if (bss_dev->vif == NULL) {
+		brcmf_err("do nothing, not initialized\n");
+		return -EINVAL;
+	}
+
+	ifp = bss_dev->vif->ifp;
+
+	/* Set the discovery state to SCAN */
+	(void)brcmf_p2p_set_discover_state(ifp, WL_P2P_DISC_ST_SCAN, 0, 0);
+
+	/* Disable P2P discovery in the firmware */
+	(void)brcmf_fil_iovar_int_set(netdev_priv(ndev), "p2p_disc", 0);
+
+	/* remove discovery interface */
+	brcmf_free_vif(bss_dev->vif);
+	bss_dev->vif = NULL;
+	kfree(ifp);
+
+	return 0;
+}
+
+/**
+ * brcmf_p2p_enable_discovery() - initialize and configure discovery.
+ *
+ * @p2p: P2P specific data.
+ * @ie: buffer containing information elements.
+ * @ie_len: length of @ie buffer.
+ *
+ * Initializes the discovery device and configure the virtual interface.
+ */
+static int brcmf_p2p_enable_discovery(struct brcmf_p2p_info *p2p,
+				      const u8 *ie, u32 ie_len)
+{
+	struct brcmf_cfg80211_vif *vif;
+	s32 ret = 0;
+
+	brcmf_dbg(TRACE, "enter\n");
+	vif = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
+	if (vif) {
+		brcmf_dbg(INFO,
+			  "DISCOVERY init already done, just process IE\n");
+		goto set_ie;
+	}
+
+	ret = brcmf_p2p_init_discovery(p2p);
+	if (ret < 0) {
+		brcmf_err("init discovery error %d\n", ret);
+		goto exit;
+	}
+
+	vif = p2p->bss_idx[P2PAPI_BSSCFG_DEVICE].vif;
+
+	/*
+	 * Set wsec to any non-zero value in the discovery bsscfg
+	 * to ensure our P2P probe responses have the privacy bit
+	 * set in the 802.11 WPA IE. Some peer devices may not
+	 * initiate WPS with us if this bit is not set.
+	 */
+	ret = brcmf_fil_bsscfg_int_set(vif->ifp, "wsec", AES_ENABLED);
+	if (ret < 0)
+		brcmf_err("wsec error %d\n", ret);
+
+set_ie:
+	if (ie_len) {
+		ret = brcmf_vif_set_mgmt_ie(vif, BRCMF_VNDR_IE_PRBREQ_FLAG,
+					    ie, ie_len);
+
+		if (ret < 0) {
+			brcmf_err("set probreq ie occurs error %d\n", ret);
+			goto exit;
+		}
+	}
+exit:
+	return ret;
+}
+
+/*
+ * brcmf_p2p_escan() - initiate a P2P scan.
+ *
+ * @p2p: P2P specific data.
+ * @num_chans: number of channels to scan.
+ * @chanspecs: channel parameters for @num_chans channels.
+ * @search_state: P2P discover state to use.
+ * @action: scan action to pass to firmware.
+ * @bss_type: type of P2P bss.
+ */
+static s32 brcmf_p2p_escan(struct brcmf_p2p_info *p2p, u32 num_chans,
+			   u16 chanspecs[], s32 search_state, u16 action,
+			   enum p2p_bss_type bss_type)
+{
+	s32 ret = 0;
+	s32 memsize = offsetof(struct brcmf_p2p_scan_le,
+			       eparams.params_le.channel_list);
+	s32 nprobes;
+	s32 active;
+	u32 i;
+	u8 *memblk;
+	struct brcmf_cfg80211_vif *vif;
+	struct brcmf_p2p_scan_le *p2p_params;
+	struct brcmf_scan_params_le *sparams;
+	struct brcmf_ssid ssid;
+
+	/* add padding if uneven */
+	if (num_chans % 2)
+		memsize += sizeof(__le16);
+	memsize += num_chans * sizeof(__le16);
+	memblk = kzalloc(memsize, GFP_KERNEL);
+	if (!memblk)
+		return -ENOMEM;
+
+	vif = p2p->bss_idx[bss_type].vif;
+	if (vif == NULL) {
+		brcmf_err("no vif for bss type %d\n", bss_type);
+		ret = -EINVAL;
+		goto exit;
+	}
+
+	switch (search_state) {
+	case WL_P2P_DISC_ST_SEARCH:
+		/*
+		 * If we in SEARCH STATE, we don't need to set SSID explictly
+		 * because dongle use P2P WILDCARD internally by default
+		 */
+		/* use null ssid */
+		ssid.SSID_len = 0;
+		memset(ssid.SSID, 0, sizeof(ssid.SSID));
+		break;
+	case WL_P2P_DISC_ST_SCAN:
+		/*
+		 * wpa_supplicant has p2p_find command with type social or
+		 * progressive. For progressive, we need to set the ssid to
+		 * P2P WILDCARD because we just do broadcast scan unless
+		 * setting SSID.
+		 */
+		ssid.SSID_len = BRCMF_P2P_WILDCARD_SSID_LEN;
+		memcpy(ssid.SSID, BRCMF_P2P_WILDCARD_SSID, ssid.SSID_len);
+		break;
+	default:
+		brcmf_err(" invalid search state %d\n", search_state);
+		ret = -EINVAL;
+		goto exit;
+	}
+
+	brcmf_p2p_set_discover_state(vif->ifp, search_state, 0, 0);
+
+	/*
+	 * set p2p scan parameters.
+	 */
+	p2p_params = (struct brcmf_p2p_scan_le *)memblk;
+	p2p_params->type = 'E';
+
+	/* determine the scan engine parameters */
+	sparams = &p2p_params->eparams.params_le;
+	sparams->bss_type = DOT11_BSSTYPE_ANY;
+	if (p2p->cfg->active_scan)
+		sparams->scan_type = 0;
+	else
+		sparams->scan_type = 1;
+
+	memset(&sparams->bssid, 0xFF, ETH_ALEN);
+	if (ssid.SSID_len)
+		memcpy(sparams->ssid_le.SSID, ssid.SSID, ssid.SSID_len);
+	sparams->ssid_le.SSID_len = cpu_to_le32(ssid.SSID_len);
+	sparams->home_time = cpu_to_le32(P2PAPI_SCAN_HOME_TIME_MS);
+
+	/*
+	 * SOCIAL_CHAN_CNT + 1 takes care of the Progressive scan
+	 * supported by the supplicant.
+	 */
+	if (num_chans == SOCIAL_CHAN_CNT || num_chans == (SOCIAL_CHAN_CNT + 1))
+		active = P2PAPI_SCAN_SOCIAL_DWELL_TIME_MS;
+	else if (num_chans == AF_PEER_SEARCH_CNT)
+		active = P2PAPI_SCAN_AF_SEARCH_DWELL_TIME_MS;
+	else if (wl_get_vif_state_all(p2p->cfg, BRCMF_VIF_STATUS_CONNECTED))
+		active = -1;
+	else
+		active = P2PAPI_SCAN_DWELL_TIME_MS;
+
+	/* Override scan params to find a peer for a connection */
+	if (num_chans == 1) {
+		active = WL_SCAN_CONNECT_DWELL_TIME_MS;
+		/* XXX WAR to sync with presence period of VSDB GO.
+		 * send probe request more frequently
+		 */
+		nprobes = active / WL_SCAN_JOIN_PROBE_INTERVAL_MS;
+	} else {
+		nprobes = active / P2PAPI_SCAN_NPROBS_TIME_MS;
+	}
+
+	if (nprobes <= 0)
+		nprobes = 1;
+
+	brcmf_dbg(INFO, "nprobes # %d, active_time %d\n", nprobes, active);
+	sparams->active_time = cpu_to_le32(active);
+	sparams->nprobes = cpu_to_le32(nprobes);
+	sparams->passive_time = cpu_to_le32(-1);
+	sparams->channel_num = cpu_to_le32(num_chans &
+					   BRCMF_SCAN_PARAMS_COUNT_MASK);
+	for (i = 0; i < num_chans; i++)
+		sparams->channel_list[i] = cpu_to_le16(chanspecs[i]);
+
+	/* set the escan specific parameters */
+	p2p_params->eparams.version = cpu_to_le32(BRCMF_ESCAN_REQ_VERSION);
+	p2p_params->eparams.action =  cpu_to_le16(action);
+	p2p_params->eparams.sync_id = cpu_to_le16(0x1234);
+	/* perform p2p scan on primary device */
+	ret = brcmf_fil_bsscfg_data_set(vif->ifp, "p2p_scan", memblk, memsize);
+	if (!ret)
+		set_bit(BRCMF_SCAN_STATUS_BUSY, &p2p->cfg->scan_status);
+exit:
+	kfree(memblk);
+	return ret;
+}
+
+/**
+ * brcmf_p2p_run_escan() - escan callback for peer-to-peer.
+ *
+ * @cfg: driver private data for cfg80211 interface.
+ * @ndev: net device for which scan is requested.
+ * @request: scan request from cfg80211.
+ * @action: scan action.
+ *
+ * Determines the P2P discovery state based to scan request parameters and
+ * validates the channels in the request.
+ */
+static s32 brcmf_p2p_run_escan(struct brcmf_cfg80211_info *cfg,
+			       struct net_device *ndev,
+			       struct cfg80211_scan_request *request,
+			       u16 action)
+{
+	struct brcmf_p2p_info *p2p = &cfg->p2p;
+	s32 err = 0;
+	s32 search_state = WL_P2P_DISC_ST_SCAN;
+	struct brcmf_cfg80211_vif *vif;
+	struct net_device *dev = NULL;
+	int i, num_nodfs = 0;
+	u16 *chanspecs;
+
+	brcmf_dbg(TRACE, "enter\n");
+
+	if (!request) {
+		err = -EINVAL;
+		goto exit;
+	}
+
+	if (request->n_channels) {
+		chanspecs = kcalloc(request->n_channels, sizeof(*chanspecs),
+				    GFP_KERNEL);
+		if (!chanspecs) {
+			err = -ENOMEM;
+			goto exit;
+		}
+		vif = p2p->bss_idx[P2PAPI_BSSCFG_CONNECTION].vif;
+		if (vif)
+			dev = vif->wdev.netdev;
+		if (request->n_channels == 3 &&
+		    request->channels[0]->hw_value == SOCIAL_CHAN_1 &&
+		    request->channels[1]->hw_value == SOCIAL_CHAN_2 &&
+		    request->channels[2]->hw_value == SOCIAL_CHAN_3) {
+			/* SOCIAL CHANNELS 1, 6, 11 */
+			search_state = WL_P2P_DISC_ST_SEARCH;
+			brcmf_dbg(INFO, "P2P SEARCH PHASE START\n");
+		} else if (dev != NULL && vif->mode == WL_MODE_AP) {
+			/* If you are already a GO, then do SEARCH only */
+			brcmf_dbg(INFO, "Already a GO. Do SEARCH Only\n");
+			search_state = WL_P2P_DISC_ST_SEARCH;
+		} else {
+			brcmf_dbg(INFO, "P2P SCAN STATE START\n");
+		}
+
+		/*
+		 * no P2P scanning on passive or DFS channels.
+		 */
+		for (i = 0; i < request->n_channels; i++) {
+			struct ieee80211_channel *chan = request->channels[i];
+
+			if (chan->flags & (IEEE80211_CHAN_RADAR |
+					   IEEE80211_CHAN_PASSIVE_SCAN))
+				continue;
+
+			chanspecs[i] = channel_to_chanspec(chan);
+			brcmf_dbg(INFO, "%d: chan=%d, channel spec=%x\n",
+				  num_nodfs, chan->hw_value, chanspecs[i]);
+			num_nodfs++;
+		}
+		err = brcmf_p2p_escan(p2p, num_nodfs, chanspecs, search_state,
+				      action, P2PAPI_BSSCFG_DEVICE);
+	}
+exit:
+	if (err)
+		brcmf_err("error (%d)\n", err);
+	return err;
+}
+
+/**
+ * brcmf_p2p_scan_prep() - prepare scan based on request.
+ *
+ * @wiphy: wiphy device.
+ * @request: scan request from cfg80211.
+ *
+ * Prepare the scan appropriately for type of scan requested. Overrides the
+ * escan .run() callback for peer-to-peer scanning.
+ */
+int brcmf_p2p_scan_prep(struct wiphy *wiphy,
+			struct cfg80211_scan_request *request)
+{
+	struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
+	struct brcmf_p2p_info *p2p = &cfg->p2p;
+	int err = 0;
+
+	if (brcmf_p2p_scan_is_p2p_request(request)) {
+		/* find my listen channel */
+		err = cfg80211_get_p2p_attr(request->ie, request->ie_len,
+				      IEEE80211_P2P_ATTR_LISTEN_CHANNEL,
+				      &p2p->listen_channel, 1);
+		if (err < 0)
+			return err;
+
+		clear_bit(BRCMF_P2P_STATUS_GO_NEG_PHASE, &p2p->status);
+		brcmf_dbg(INFO, "P2P: GO_NEG_PHASE status cleared\n");
+
+		err = brcmf_p2p_enable_discovery(p2p, request->ie,
+						 request->ie_len);
+
+		/*
+		 * override .run_escan() callback.
+		 */
+		cfg->escan_info.run = brcmf_p2p_run_escan;
+	} else {
+		/*
+		 * legacy scan trigger
+		 * So, we have to disable p2p discovery if p2p discovery is on
+		 */
+		(void)brcmf_p2p_discover_disable_search(p2p);
+
+		/*
+		 * clear p2p vendor ies for probe request set by
+		 * previous p2p related scan(s).
+		 */
+		if (p2p_discover_vif(p2p))
+			err = brcmf_vif_set_mgmt_ie(p2p_discover_vif(p2p),
+						    BRCMF_VNDR_IE_PRBREQ_FLAG,
+						    request->ie,
+						    request->ie_len);
+	}
+	return err;
+}
+
+/**
+ * brcmf_p2p_attach() - attach for P2P.
+ *
+ * @cfg: driver private data for cfg80211 interface.
+ */
+void brcmf_p2p_attach(struct brcmf_cfg80211_info *cfg)
+{
+	struct brcmf_p2p_info *p2p;
+
+	p2p = &cfg->p2p;
+
+	p2p->cfg = cfg;
+	brcmf_p2p_set_firmware(p2p);
+	brcmf_p2p_generate_bss_mac(p2p);
+}
+
+/**
+ * brcmf_p2p_detach() - detach P2P.
+ *
+ * @p2p: P2P specific data.
+ */
+void brcmf_p2p_detach(struct brcmf_p2p_info *p2p)
+{
+	brcmf_p2p_deinit_discovery(p2p);
+	/* just set it all to zero */
+	memset(p2p, 0, sizeof(*p2p));
+}
+
+/**
+ * brcmf_p2p_add_vif() - create a new P2P virtual interface.
+ *
+ * @wiphy: wiphy device of new interface.
+ * @name: name of the new interface.
+ * @type: nl80211 interface type.
+ * @flags: TBD
+ * @params: TBD
+ *
+ * TODO: not yet supported.
+ */
+struct wireless_dev *brcmf_p2p_add_vif(struct wiphy *wiphy, const char *name,
+				       enum nl80211_iftype type, u32 *flags,
+				       struct vif_params *params)
+{
+	brcmf_err("enter - not supported yet\n");
+	brcmf_dbg(INFO, "adding vif \"%s\" (type=%d)\n", name, type);
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
+/**
+ * brcmf_p2p_del_vif() - delete a P2P virtual interface.
+ *
+ * @wiphy: wiphy device of interface.
+ * @wdev: wireless device of interface.
+ *
+ * TODO: not yet supported.
+ */
+int brcmf_p2p_del_vif(struct wiphy *wiphy, struct wireless_dev *wdev)
+{
+	struct brcmf_cfg80211_vif *vif;
+
+	vif = container_of(wdev, struct brcmf_cfg80211_vif, wdev);
+	if (wdev->netdev)
+		brcmf_dbg(INFO, "deleting vif \"%s\"\n", wdev->netdev->name);
+	else
+		brcmf_dbg(INFO, "deleting vif \"wdev-%u\"\n",
+			  wdev->identifier);
+	brcmf_err("enter - not supported yet\n");
+	return -EOPNOTSUPP;
+}