drivers/net/wireless/brcm80211/brcmfmac/p2p.c

/*
 * 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;
}