wl_cfg80211.c

/*
 * Copyright (c) 2010 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.
 */

/* Toplevel file. Relies on dhd_linux.c to send commands to the dongle. */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/if_arp.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#include <linux/netdevice.h>
#include <linux/bitops.h>
#include <linux/etherdevice.h>
#include <linux/ieee80211.h>
#include <linux/uaccess.h>
#include <net/cfg80211.h>
#include <net/netlink.h>

#include <brcmu_utils.h>
#include <defs.h>
#include <brcmu_wifi.h>
#include "dhd.h"
#include "wl_cfg80211.h"
#include "fwil.h"

#define BRCMF_SCAN_IE_LEN_MAX		2048
#define BRCMF_PNO_VERSION		2
#define BRCMF_PNO_TIME			30
#define BRCMF_PNO_REPEAT		4
#define BRCMF_PNO_FREQ_EXPO_MAX		3
#define BRCMF_PNO_MAX_PFN_COUNT		16
#define BRCMF_PNO_ENABLE_ADAPTSCAN_BIT	6
#define BRCMF_PNO_HIDDEN_BIT		2
#define BRCMF_PNO_WPA_AUTH_ANY		0xFFFFFFFF
#define BRCMF_PNO_SCAN_COMPLETE		1
#define BRCMF_PNO_SCAN_INCOMPLETE	0

#define TLV_LEN_OFF			1	/* length offset */
#define TLV_HDR_LEN			2	/* header length */
#define TLV_BODY_OFF			2	/* body offset */
#define TLV_OUI_LEN			3	/* oui id length */
#define WPA_OUI				"\x00\x50\xF2"	/* WPA OUI */
#define WPA_OUI_TYPE			1
#define RSN_OUI				"\x00\x0F\xAC"	/* RSN OUI */
#define	WME_OUI_TYPE			2

#define VS_IE_FIXED_HDR_LEN		6
#define WPA_IE_VERSION_LEN		2
#define WPA_IE_MIN_OUI_LEN		4
#define WPA_IE_SUITE_COUNT_LEN		2

#define WPA_CIPHER_NONE			0	/* None */
#define WPA_CIPHER_WEP_40		1	/* WEP (40-bit) */
#define WPA_CIPHER_TKIP			2	/* TKIP: default for WPA */
#define WPA_CIPHER_AES_CCM		4	/* AES (CCM) */
#define WPA_CIPHER_WEP_104		5	/* WEP (104-bit) */

#define RSN_AKM_NONE			0	/* None (IBSS) */
#define RSN_AKM_UNSPECIFIED		1	/* Over 802.1x */
#define RSN_AKM_PSK			2	/* Pre-shared Key */
#define RSN_CAP_LEN			2	/* Length of RSN capabilities */
#define RSN_CAP_PTK_REPLAY_CNTR_MASK	0x000C

#define VNDR_IE_CMD_LEN			4	/* length of the set command
						 * string :"add", "del" (+ NUL)
						 */
#define VNDR_IE_COUNT_OFFSET		4
#define VNDR_IE_PKTFLAG_OFFSET		8
#define VNDR_IE_VSIE_OFFSET		12
#define VNDR_IE_HDR_SIZE		12
#define VNDR_IE_BEACON_FLAG		0x1
#define VNDR_IE_PRBRSP_FLAG		0x2
#define MAX_VNDR_IE_NUMBER		5

#define	DOT11_MGMT_HDR_LEN		24	/* d11 management header len */
#define	DOT11_BCN_PRB_FIXED_LEN		12	/* beacon/probe fixed length */

#define BRCMF_ASSOC_PARAMS_FIXED_SIZE \
	(sizeof(struct brcmf_assoc_params_le) - sizeof(u16))

static const u8 ether_bcast[ETH_ALEN] = {255, 255, 255, 255, 255, 255};

static u32 brcmf_dbg_level = WL_DBG_ERR;

static bool check_sys_up(struct wiphy *wiphy)
{
	struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
	if (!test_bit(WL_STATUS_READY, &cfg->status)) {
		WL_INFO("device is not ready : status (%d)\n",
			(int)cfg->status);
		return false;
	}
	return true;
}

#define CHAN2G(_channel, _freq, _flags) {			\
	.band			= IEEE80211_BAND_2GHZ,		\
	.center_freq		= (_freq),			\
	.hw_value		= (_channel),			\
	.flags			= (_flags),			\
	.max_antenna_gain	= 0,				\
	.max_power		= 30,				\
}

#define CHAN5G(_channel, _flags) {				\
	.band			= IEEE80211_BAND_5GHZ,		\
	.center_freq		= 5000 + (5 * (_channel)),	\
	.hw_value		= (_channel),			\
	.flags			= (_flags),			\
	.max_antenna_gain	= 0,				\
	.max_power		= 30,				\
}

#define RATE_TO_BASE100KBPS(rate)   (((rate) * 10) / 2)
#define RATETAB_ENT(_rateid, _flags) \
	{                                                               \
		.bitrate        = RATE_TO_BASE100KBPS(_rateid),     \
		.hw_value       = (_rateid),                            \
		.flags          = (_flags),                             \
	}

static struct ieee80211_rate __wl_rates[] = {
	RATETAB_ENT(BRCM_RATE_1M, 0),
	RATETAB_ENT(BRCM_RATE_2M, IEEE80211_RATE_SHORT_PREAMBLE),
	RATETAB_ENT(BRCM_RATE_5M5, IEEE80211_RATE_SHORT_PREAMBLE),
	RATETAB_ENT(BRCM_RATE_11M, IEEE80211_RATE_SHORT_PREAMBLE),
	RATETAB_ENT(BRCM_RATE_6M, 0),
	RATETAB_ENT(BRCM_RATE_9M, 0),
	RATETAB_ENT(BRCM_RATE_12M, 0),
	RATETAB_ENT(BRCM_RATE_18M, 0),
	RATETAB_ENT(BRCM_RATE_24M, 0),
	RATETAB_ENT(BRCM_RATE_36M, 0),
	RATETAB_ENT(BRCM_RATE_48M, 0),
	RATETAB_ENT(BRCM_RATE_54M, 0),
};

#define wl_a_rates		(__wl_rates + 4)
#define wl_a_rates_size	8
#define wl_g_rates		(__wl_rates + 0)
#define wl_g_rates_size	12

static struct ieee80211_channel __wl_2ghz_channels[] = {
	CHAN2G(1, 2412, 0),
	CHAN2G(2, 2417, 0),
	CHAN2G(3, 2422, 0),
	CHAN2G(4, 2427, 0),
	CHAN2G(5, 2432, 0),
	CHAN2G(6, 2437, 0),
	CHAN2G(7, 2442, 0),
	CHAN2G(8, 2447, 0),
	CHAN2G(9, 2452, 0),
	CHAN2G(10, 2457, 0),
	CHAN2G(11, 2462, 0),
	CHAN2G(12, 2467, 0),
	CHAN2G(13, 2472, 0),
	CHAN2G(14, 2484, 0),
};

static struct ieee80211_channel __wl_5ghz_a_channels[] = {
	CHAN5G(34, 0), CHAN5G(36, 0),
	CHAN5G(38, 0), CHAN5G(40, 0),
	CHAN5G(42, 0), CHAN5G(44, 0),
	CHAN5G(46, 0), CHAN5G(48, 0),
	CHAN5G(52, 0), CHAN5G(56, 0),
	CHAN5G(60, 0), CHAN5G(64, 0),
	CHAN5G(100, 0), CHAN5G(104, 0),
	CHAN5G(108, 0), CHAN5G(112, 0),
	CHAN5G(116, 0), CHAN5G(120, 0),
	CHAN5G(124, 0), CHAN5G(128, 0),
	CHAN5G(132, 0), CHAN5G(136, 0),
	CHAN5G(140, 0), CHAN5G(149, 0),
	CHAN5G(153, 0), CHAN5G(157, 0),
	CHAN5G(161, 0), CHAN5G(165, 0),
	CHAN5G(184, 0), CHAN5G(188, 0),
	CHAN5G(192, 0), CHAN5G(196, 0),
	CHAN5G(200, 0), CHAN5G(204, 0),
	CHAN5G(208, 0), CHAN5G(212, 0),
	CHAN5G(216, 0),
};

static struct ieee80211_channel __wl_5ghz_n_channels[] = {
	CHAN5G(32, 0), CHAN5G(34, 0),
	CHAN5G(36, 0), CHAN5G(38, 0),
	CHAN5G(40, 0), CHAN5G(42, 0),
	CHAN5G(44, 0), CHAN5G(46, 0),
	CHAN5G(48, 0), CHAN5G(50, 0),
	CHAN5G(52, 0), CHAN5G(54, 0),
	CHAN5G(56, 0), CHAN5G(58, 0),
	CHAN5G(60, 0), CHAN5G(62, 0),
	CHAN5G(64, 0), CHAN5G(66, 0),
	CHAN5G(68, 0), CHAN5G(70, 0),
	CHAN5G(72, 0), CHAN5G(74, 0),
	CHAN5G(76, 0), CHAN5G(78, 0),
	CHAN5G(80, 0), CHAN5G(82, 0),
	CHAN5G(84, 0), CHAN5G(86, 0),
	CHAN5G(88, 0), CHAN5G(90, 0),
	CHAN5G(92, 0), CHAN5G(94, 0),
	CHAN5G(96, 0), CHAN5G(98, 0),
	CHAN5G(100, 0), CHAN5G(102, 0),
	CHAN5G(104, 0), CHAN5G(106, 0),
	CHAN5G(108, 0), CHAN5G(110, 0),
	CHAN5G(112, 0), CHAN5G(114, 0),
	CHAN5G(116, 0), CHAN5G(118, 0),
	CHAN5G(120, 0), CHAN5G(122, 0),
	CHAN5G(124, 0), CHAN5G(126, 0),
	CHAN5G(128, 0), CHAN5G(130, 0),
	CHAN5G(132, 0), CHAN5G(134, 0),
	CHAN5G(136, 0), CHAN5G(138, 0),
	CHAN5G(140, 0), CHAN5G(142, 0),
	CHAN5G(144, 0), CHAN5G(145, 0),
	CHAN5G(146, 0), CHAN5G(147, 0),
	CHAN5G(148, 0), CHAN5G(149, 0),
	CHAN5G(150, 0), CHAN5G(151, 0),
	CHAN5G(152, 0), CHAN5G(153, 0),
	CHAN5G(154, 0), CHAN5G(155, 0),
	CHAN5G(156, 0), CHAN5G(157, 0),
	CHAN5G(158, 0), CHAN5G(159, 0),
	CHAN5G(160, 0), CHAN5G(161, 0),
	CHAN5G(162, 0), CHAN5G(163, 0),
	CHAN5G(164, 0), CHAN5G(165, 0),
	CHAN5G(166, 0), CHAN5G(168, 0),
	CHAN5G(170, 0), CHAN5G(172, 0),
	CHAN5G(174, 0), CHAN5G(176, 0),
	CHAN5G(178, 0), CHAN5G(180, 0),
	CHAN5G(182, 0), CHAN5G(184, 0),
	CHAN5G(186, 0), CHAN5G(188, 0),
	CHAN5G(190, 0), CHAN5G(192, 0),
	CHAN5G(194, 0), CHAN5G(196, 0),
	CHAN5G(198, 0), CHAN5G(200, 0),
	CHAN5G(202, 0), CHAN5G(204, 0),
	CHAN5G(206, 0), CHAN5G(208, 0),
	CHAN5G(210, 0), CHAN5G(212, 0),
	CHAN5G(214, 0), CHAN5G(216, 0),
	CHAN5G(218, 0), CHAN5G(220, 0),
	CHAN5G(222, 0), CHAN5G(224, 0),
	CHAN5G(226, 0), CHAN5G(228, 0),
};

static struct ieee80211_supported_band __wl_band_2ghz = {
	.band = IEEE80211_BAND_2GHZ,
	.channels = __wl_2ghz_channels,
	.n_channels = ARRAY_SIZE(__wl_2ghz_channels),
	.bitrates = wl_g_rates,
	.n_bitrates = wl_g_rates_size,
};

static struct ieee80211_supported_band __wl_band_5ghz_a = {
	.band = IEEE80211_BAND_5GHZ,
	.channels = __wl_5ghz_a_channels,
	.n_channels = ARRAY_SIZE(__wl_5ghz_a_channels),
	.bitrates = wl_a_rates,
	.n_bitrates = wl_a_rates_size,
};

static struct ieee80211_supported_band __wl_band_5ghz_n = {
	.band = IEEE80211_BAND_5GHZ,
	.channels = __wl_5ghz_n_channels,
	.n_channels = ARRAY_SIZE(__wl_5ghz_n_channels),
	.bitrates = wl_a_rates,
	.n_bitrates = wl_a_rates_size,
};

static const u32 __wl_cipher_suites[] = {
	WLAN_CIPHER_SUITE_WEP40,
	WLAN_CIPHER_SUITE_WEP104,
	WLAN_CIPHER_SUITE_TKIP,
	WLAN_CIPHER_SUITE_CCMP,
	WLAN_CIPHER_SUITE_AES_CMAC,
};

/* tag_ID/length/value_buffer tuple */
struct brcmf_tlv {
	u8 id;
	u8 len;
	u8 data[1];
};

/* Vendor specific ie. id = 221, oui and type defines exact ie */
struct brcmf_vs_tlv {
	u8 id;
	u8 len;
	u8 oui[3];
	u8 oui_type;
};

struct parsed_vndr_ie_info {
	u8 *ie_ptr;
	u32 ie_len;	/* total length including id & length field */
	struct brcmf_vs_tlv vndrie;
};

struct parsed_vndr_ies {
	u32 count;
	struct parsed_vndr_ie_info ie_info[MAX_VNDR_IE_NUMBER];
};

/* Quarter dBm units to mW
 * Table starts at QDBM_OFFSET, so the first entry is mW for qdBm=153
 * Table is offset so the last entry is largest mW value that fits in
 * a u16.
 */

#define QDBM_OFFSET 153		/* Offset for first entry */
#define QDBM_TABLE_LEN 40	/* Table size */

/* Smallest mW value that will round up to the first table entry, QDBM_OFFSET.
 * Value is ( mW(QDBM_OFFSET - 1) + mW(QDBM_OFFSET) ) / 2
 */
#define QDBM_TABLE_LOW_BOUND 6493	/* Low bound */

/* Largest mW value that will round down to the last table entry,
 * QDBM_OFFSET + QDBM_TABLE_LEN-1.
 * Value is ( mW(QDBM_OFFSET + QDBM_TABLE_LEN - 1) +
 * mW(QDBM_OFFSET + QDBM_TABLE_LEN) ) / 2.
 */
#define QDBM_TABLE_HIGH_BOUND 64938	/* High bound */

static const u16 nqdBm_to_mW_map[QDBM_TABLE_LEN] = {
/* qdBm:	+0	+1	+2	+3	+4	+5	+6	+7 */
/* 153: */ 6683, 7079, 7499, 7943, 8414, 8913, 9441, 10000,
/* 161: */ 10593, 11220, 11885, 12589, 13335, 14125, 14962, 15849,
/* 169: */ 16788, 17783, 18836, 19953, 21135, 22387, 23714, 25119,
/* 177: */ 26607, 28184, 29854, 31623, 33497, 35481, 37584, 39811,
/* 185: */ 42170, 44668, 47315, 50119, 53088, 56234, 59566, 63096
};

static u16 brcmf_qdbm_to_mw(u8 qdbm)
{
	uint factor = 1;
	int idx = qdbm - QDBM_OFFSET;

	if (idx >= QDBM_TABLE_LEN)
		/* clamp to max u16 mW value */
		return 0xFFFF;

	/* scale the qdBm index up to the range of the table 0-40
	 * where an offset of 40 qdBm equals a factor of 10 mW.
	 */
	while (idx < 0) {
		idx += 40;
		factor *= 10;
	}

	/* return the mW value scaled down to the correct factor of 10,
	 * adding in factor/2 to get proper rounding.
	 */
	return (nqdBm_to_mW_map[idx] + factor / 2) / factor;
}

static u8 brcmf_mw_to_qdbm(u16 mw)
{
	u8 qdbm;
	int offset;
	uint mw_uint = mw;
	uint boundary;

	/* handle boundary case */
	if (mw_uint <= 1)
		return 0;

	offset = QDBM_OFFSET;

	/* move mw into the range of the table */
	while (mw_uint < QDBM_TABLE_LOW_BOUND) {
		mw_uint *= 10;
		offset -= 40;
	}

	for (qdbm = 0; qdbm < QDBM_TABLE_LEN - 1; qdbm++) {
		boundary = nqdBm_to_mW_map[qdbm] + (nqdBm_to_mW_map[qdbm + 1] -
						    nqdBm_to_mW_map[qdbm]) / 2;
		if (mw_uint < boundary)
			break;
	}

	qdbm += (u8) offset;

	return qdbm;
}

static void convert_key_from_CPU(struct brcmf_wsec_key *key,
				 struct brcmf_wsec_key_le *key_le)
{
	key_le->index = cpu_to_le32(key->index);
	key_le->len = cpu_to_le32(key->len);
	key_le->algo = cpu_to_le32(key->algo);
	key_le->flags = cpu_to_le32(key->flags);
	key_le->rxiv.hi = cpu_to_le32(key->rxiv.hi);
	key_le->rxiv.lo = cpu_to_le16(key->rxiv.lo);
	key_le->iv_initialized = cpu_to_le32(key->iv_initialized);
	memcpy(key_le->data, key->data, sizeof(key->data));
	memcpy(key_le->ea, key->ea, sizeof(key->ea));
}

static int
send_key_to_dongle(struct brcmf_cfg80211_info *cfg, s32 bssidx,
		   struct net_device *ndev, struct brcmf_wsec_key *key)
{
	int err;
	struct brcmf_wsec_key_le key_le;

	convert_key_from_CPU(key, &key_le);

	brcmf_netdev_wait_pend8021x(ndev);

	err = brcmf_fil_bsscfg_data_set(ndev, "wsec_key", &key_le,
					sizeof(key_le));

	if (err)
		WL_ERR("wsec_key error (%d)\n", err);
	return err;
}

static s32
brcmf_cfg80211_change_iface(struct wiphy *wiphy, struct net_device *ndev,
			 enum nl80211_iftype type, u32 *flags,
			 struct vif_params *params)
{
	struct brcmf_cfg80211_info *cfg = wiphy_to_cfg(wiphy);
	s32 infra = 0;
	s32 ap = 0;
	s32 err = 0;

	WL_TRACE("Enter, ndev=%p, type=%d\n", ndev, type);

	switch (type) {
	case NL80211_IFTYPE_MONITOR:
	case NL80211_IFTYPE_WDS:
		WL_ERR("type (%d) : currently we do not support this type\n",
		       type);
		return -EOPNOTSUPP;
	case NL80211_IFTYPE_ADHOC:
		cfg->conf->mode = WL_MODE_IBSS;
		infra = 0;
		break;
	case NL80211_IFTYPE_STATION:
		cfg->conf->mode = WL_MODE_BSS;
		infra = 1;
		break;
	case NL80211_IFTYPE_AP:
		cfg->conf->mode = WL_MODE_AP;
		ap = 1;
		break;
	default:
		err = -EINVAL;
		goto done;
	}

	if (ap) {
		set_bit(WL_STATUS_AP_CREATING, &cfg->status);
		if (!cfg->ap_info)
			cfg->ap_info = kzalloc(sizeof(*cfg->ap_info),
					       GFP_KERNEL);
		if (!cfg->ap_info) {
			err = -ENOMEM;
			goto done;
		}
		WL_INFO("IF Type = AP\n");
	} else {
		err = brcmf_fil_cmd_int_set(ndev, BRCMF_C_SET_INFRA, infra);
		if (err) {
			WL_ERR("WLC_SET_INFRA error (%d)\n", err);
			err = -EAGAIN;
			goto done;
		}
		WL_INFO("IF Type = %s\n",
			(cfg->conf->mode == WL_MODE_IBSS) ?
			"Adhoc" : "Infra");
	}
	ndev->ieee80211_ptr->iftype = type;

done:
	WL_TRACE("Exit\n");

	return err;
}

/*
 * For now brcmf_find_bssidx will return 0. Once p2p gets implemented this
 * should return the ndev matching bssidx.
 */
static s32
brcmf_find_bssidx(struct brcmf_cfg80211_info *cfg, struct net_device *ndev)
{
	return 0;
}

static void brcmf_set_mpc(struct net_device *ndev, int mpc)
{
	s32 err = 0;
	struct brcmf_cfg80211_info *cfg = ndev_to_cfg(ndev);

	if (test_bit(WL_STATUS_READY, &cfg->status)) {
		err = brcmf_fil_iovar_int_set(ndev, "mpc", mpc);
		if (err) {
			WL_ERR("fail to set mpc\n");
			return;
		}
		WL_INFO("MPC : %d\n", mpc);
	}
}

static void brcmf_iscan_prep(struct brcmf_scan_params_le *params_le,
			     struct brcmf_ssid *ssid)
{
	memcpy(params_le->bssid, ether_bcast, ETH_ALEN);
	params_le->bss_type = DOT11_BSSTYPE_ANY;
	params_le->scan_type = 0;
	params_le->channel_num = 0;
	params_le->nprobes = cpu_to_le32(-1);
	params_le->active_time = cpu_to_le32(-1);
	params_le->passive_time = cpu_to_le32(-1);
	params_le->home_time = cpu_to_le32(-1);
	if (ssid && ssid->SSID_len) {
		params_le->ssid_le.SSID_len = cpu_to_le32(ssid->SSID_len);
		memcpy(&params_le->ssid_le.SSID, ssid->SSID, ssid->SSID_len);
	}
}

static s32
brcmf_run_iscan(struct brcmf_cfg80211_iscan_ctrl *iscan,
		struct brcmf_ssid *ssid, u16 action)
{
	s32 params_size = BRCMF_SCAN_PARAMS_FIXED_SIZE +
			  offsetof(struct brcmf_iscan_params_le, params_le);
	struct brcmf_iscan_params_le *params;
	s32 err = 0;

	if (ssid && ssid->SSID_len)
		params_size += sizeof(struct brcmf_ssid);
	params = kzalloc(params_size, GFP_KERNEL);
	if (!params)
		return -ENOMEM;
	BUG_ON(params_size >= BRCMF_DCMD_SMLEN);

	brcmf_iscan_prep(&params->params_le, ssid);

	params->version = cpu_to_le32(BRCMF_ISCAN_REQ_VERSION);
	params->action = cpu_to_le16(action);
	params->scan_duration = cpu_to_le16(0);

	err = brcmf_fil_iovar_data_set(iscan->ndev, "iscan", params,
				       params_size);
	if (err) {
		if (err == -EBUSY)
			WL_INFO("system busy : iscan canceled\n");
		else
			WL_ERR("error (%d)\n", err);
	}

	kfree(params);
	return err;
}

static s32 brcmf_do_iscan(struct brcmf_cfg80211_info *cfg)
{
	struct brcmf_cfg80211_iscan_ctrl *iscan = cfg_to_iscan(cfg);
	struct net_device *ndev = cfg_to_ndev(cfg);
	struct brcmf_ssid ssid;
	u32 passive_scan;
	s32 err = 0;

	/* Broadcast scan by default */
	memset(&ssid, 0, sizeof(ssid));

	iscan->state = WL_ISCAN_STATE_SCANING;

	passive_scan = cfg->active_scan ? 0 : 1;
	err = brcmf_fil_cmd_int_set(cfg_to_ndev(cfg),
				    BRCMF_C_SET_PASSIVE_SCAN, passive_scan);
	if (err) {
		WL_ERR("error (%d)\n", err);
		return err;
	}
	brcmf_set_mpc(ndev, 0);
	cfg->iscan_kickstart = true;
	err = brcmf_run_iscan(iscan, &ssid, BRCMF_SCAN_ACTION_START);
	if (err) {
		brcmf_set_mpc(ndev, 1);
		cfg->iscan_kickstart = false;
		return err;
	}
	mod_timer(&iscan->timer, jiffies + iscan->timer_ms * HZ / 1000);
	iscan->timer_on = 1;
	return err;
}

static s32
brcmf_cfg80211_iscan(struct wiphy *wiphy, struct net_device *ndev,
		     struct cfg80211_scan_request *request,
		     struct cfg80211_ssid *this_ssid)
{
	struct brcmf_cfg80211_info *cfg = ndev_to_cfg(ndev);
	struct cfg80211_ssid *ssids;
	struct brcmf_cfg80211_scan_req *sr = cfg->scan_req_int;
	u32 passive_scan;
	bool iscan_req;
	bool spec_scan;
	s32 err = 0;
	u32 SSID_len;

	if (test_bit(WL_STATUS_SCANNING, &cfg->status)) {
		WL_ERR("Scanning already : status (%lu)\n", cfg->status);
		return -EAGAIN;
	}
	if (test_bit(WL_STATUS_SCAN_ABORTING, &cfg->status)) {
		WL_ERR("Scanning being aborted : status (%lu)\n",
		       cfg->status);
		return -EAGAIN;
	}
	if (test_bit(WL_STATUS_CONNECTING, &cfg->status)) {
		WL_ERR("Connecting : status (%lu)\n",
		       cfg->status);
		return -EAGAIN;
	}

	iscan_req = false;
	spec_scan = false;
	if (request) {
		/* scan bss */
		ssids = request->ssids;
		if (cfg->iscan_on && (!ssids || !ssids->ssid_len))
			iscan_req = true;
	} else {
		/* scan in ibss */
		/* we don't do iscan in ibss */
		ssids = this_ssid;
	}

	cfg->scan_request = request;
	set_bit(WL_STATUS_SCANNING, &cfg->status);
	if (iscan_req) {
		err = brcmf_do_iscan(cfg);
		if (!err)
			return err;
		else
			goto scan_out;
	} else {
		WL_SCAN("ssid \"%s\", ssid_len (%d)\n",
		       ssids->ssid, ssids->ssid_len);
		memset(&sr->ssid_le, 0, sizeof(sr->ssid_le));
		SSID_len = min_t(u8, sizeof(sr->ssid_le.SSID), ssids->ssid_len);
		sr->ssid_le.SSID_len = cpu_to_le32(0);
		if (SSID_len) {
			memcpy(sr->ssid_le.SSID, ssids->ssid, SSID_len);
			sr->ssid_le.SSID_len = cpu_to_le32(SSID_len);
			spec_scan = true;
		} else {
			WL_SCAN("Broadcast scan\n");
		}

		passive_scan = cfg->active_scan ? 0 : 1;
		err = brcmf_fil_cmd_int_set(ndev, BRCMF_C_SET_PASSIVE_SCAN,
					    passive_scan);
		if (err) {
			WL_ERR("WLC_SET_PASSIVE_SCAN error (%d)\n", err);
			goto scan_out;
		}
		brcmf_set_mpc(ndev, 0);
		err = brcmf_fil_cmd_data_set(ndev, BRCMF_C_SCAN, &sr->ssid_le,
					     sizeof(sr->ssid_le));
		if (err) {
			if (err == -EBUSY)
				WL_INFO("system busy : scan for \"%s\" "
					"canceled\n", sr->ssid_le.SSID);
			else
				WL_ERR("WLC_SCAN error (%d)\n", err);

			brcmf_set_mpc(ndev, 1);
			goto scan_out;
		}
	}

	return 0;

scan_out:
	clear_bit(WL_STATUS_SCANNING, &cfg->status);
	cfg->scan_request = NULL;
	return err;
}

static void brcmf_escan_prep(struct brcmf_scan_params_le *params_le,
			     struct cfg80211_scan_request *request)
{
	u32 n_ssids;
	u32 n_channels;
	s32 i;
	s32 offset;
	u16 chanspec;
	u16 channel;
	struct ieee80211_channel *req_channel;
	char *ptr;
	struct brcmf_ssid_le ssid_le;

	memcpy(params_le->bssid, ether_bcast, ETH_ALEN);
	params_le->bss_type = DOT11_BSSTYPE_ANY;
	params_le->scan_type = 0;
	params_le->channel_num = 0;
	params_le->nprobes = cpu_to_le32(-1);
	params_le->active_time = cpu_to_le32(-1);
	params_le->passive_time = cpu_to_le32(-1);
	params_le->home_time = cpu_to_le32(-1);
	memset(&params_le->ssid_le, 0, sizeof(params_le->ssid_le));

	/* if request is null exit so it will be all channel broadcast scan */
	if (!request)
		return;

	n_ssids = request->n_ssids;
	n_channels = request->n_channels;
	/* Copy channel array if applicable */
	WL_SCAN("### List of channelspecs to scan ### %d\n", n_channels);
	if (n_channels > 0) {
		for (i = 0; i < n_channels; i++) {
			chanspec = 0;
			req_channel = request->channels[i];
			channel = ieee80211_frequency_to_channel(
					req_channel->center_freq);
			if (req_channel->band == IEEE80211_BAND_2GHZ)
				chanspec |= WL_CHANSPEC_BAND_2G;
			else
				chanspec |= WL_CHANSPEC_BAND_5G;

			if (req_channel->flags & IEEE80211_CHAN_NO_HT40) {
				chanspec |= WL_CHANSPEC_BW_20;
				chanspec |= WL_CHANSPEC_CTL_SB_NONE;
			} else {
				chanspec |= WL_CHANSPEC_BW_40;
				if (req_channel->flags &
						IEEE80211_CHAN_NO_HT40PLUS)
					chanspec |= WL_CHANSPEC_CTL_SB_LOWER;
				else
					chanspec |= WL_CHANSPEC_CTL_SB_UPPER;
			}

			chanspec |= (channel & WL_CHANSPEC_CHAN_MASK);
			WL_SCAN("Chan : %d, Channel spec: %x\n",
				channel, chanspec);
			params_le->channel_list[i] = cpu_to_le16(chanspec);
		}
	} else {
		WL_SCAN("Scanning all channels\n");
	}
	/* Copy ssid array if applicable */
	WL_SCAN("### List of SSIDs to scan ### %d\n", n_ssids);
	if (n_ssids > 0) {
		offset = offsetof(struct brcmf_scan_params_le, channel_list) +
				n_channels * sizeof(u16);
		offset = roundup(offset, sizeof(u32));
		ptr = (char *)params_le + offset;
		for (i = 0; i < n_ssids; i++) {
			memset(&ssid_le, 0, sizeof(ssid_le));
			ssid_le.SSID_len =
					cpu_to_le32(request->ssids[i].ssid_len);
			memcpy(ssid_le.SSID, request->ssids[i].ssid,
			       request->ssids[i].ssid_len);
			if (!ssid_le.SSID_len)
				WL_SCAN("%d: Broadcast scan\n", i);
			else
				WL_SCAN("%d: scan for  %s size =%d\n", i,
					ssid_le.SSID, ssid_le.SSID_len);
			memcpy(ptr, &ssid_le, sizeof(ssid_le));
			ptr += sizeof(ssid_le);
		}
	} else {
		WL_SCAN("Broadcast scan %p\n", request->ssids);
		if ((request->ssids) && request->ssids->ssid_len) {
			WL_SCAN("SSID %s len=%d\n", params_le->ssid_le.SSID,
				request->ssids->ssid_len);
			params_le->ssid_le.SSID_len =
				cpu_to_le32(request->ssids->ssid_len);
			memcpy(&params_le->ssid_le.SSID, request->ssids->ssid,
				request->ssids->ssid_len);
		}
	}
	/* Adding mask to channel numbers */
	params_le->channel_num =
		cpu_to_le32((n_ssids << BRCMF_SCAN_PARAMS_NSSID_SHIFT) |
			(n_channels & BRCMF_SCAN_PARAMS_COUNT_MASK));
}

static s32
brcmf_notify_escan_complete(struct brcmf_cfg80211_info *cfg,
			    struct net_device *ndev,
			    bool aborted, bool fw_abort)
{
	struct brcmf_scan_params_le params_le;
	struct cfg80211_scan_request *scan_request;
	s32 err = 0;

	WL_SCAN("Enter\n");

	/* clear scan request, because the FW abort can cause a second call */
	/* to this functon and might cause a double cfg80211_scan_done      */
	scan_request = cfg->scan_request;
	cfg->scan_request = NULL;

	if (timer_pending(&cfg->escan_timeout))
		del_timer_sync(&cfg->escan_timeout);

	if (fw_abort) {
		/* Do a scan abort to stop the driver's scan engine */
		WL_SCAN("ABORT scan in firmware\n");
		memset(&params_le, 0, sizeof(params_le));
		memcpy(params_le.bssid, ether_bcast, ETH_ALEN);
		params_le.bss_type = DOT11_BSSTYPE_ANY;
		params_le.scan_type = 0;
		params_le.channel_num = cpu_to_le32(1);
		params_le.nprobes = cpu_to_le32(1);
		params_le.active_time = cpu_to_le32(-1);
		params_le.passive_time = cpu_to_le32(-1);
		params_le.home_time = cpu_to_le32(-1);
		/* Scan is aborted by setting channel_list[0] to -1 */
		params_le.channel_list[0] = cpu_to_le16(-1);
		/* E-Scan (or anyother type) can be aborted by SCAN */
		err = brcmf_fil_cmd_data_set(ndev, BRCMF_C_SCAN, &params_le,
					     sizeof(params_le));
		if (err)
			WL_ERR("Scan abort  failed\n");
	}
	/*
	 * e-scan can be initiated by scheduled scan
	 * which takes precedence.
	 */
	if (cfg->sched_escan) {
		WL_SCAN("scheduled scan completed\n");
		cfg->sched_escan = false;
		if (!aborted)
			cfg80211_sched_scan_results(cfg_to_wiphy(cfg));
		brcmf_set_mpc(ndev, 1);
	} else if (scan_request) {
		WL_SCAN("ESCAN Completed scan: %s\n",
				aborted ? "Aborted" : "Done");
		cfg80211_scan_done(scan_request, aborted);
		brcmf_set_mpc(ndev, 1);
	}
	if (!test_and_clear_bit(WL_STATUS_SCANNING, &cfg->status)) {
		WL_ERR("Scan complete while device not scanning\n");
		return -EPERM;
	}

	return err;
}

static s32
brcmf_run_escan(struct brcmf_cfg80211_info *cfg, struct net_device *ndev,
		struct cfg80211_scan_request *request, u16 action)
{
	s32 params_size = BRCMF_SCAN_PARAMS_FIXED_SIZE +
			  offsetof(struct brcmf_escan_params_le, params_le);
	struct brcmf_escan_params_le *params;
	s32 err = 0;

	WL_SCAN("E-SCAN START\n");

	if (request != NULL) {
		/* Allocate space for populating ssids in struct */
		params_size += sizeof(u32) * ((request->n_channels + 1) / 2);

		/* Allocate space for populating ssids in struct */
		params_size += sizeof(struct brcmf_ssid) * request->n_ssids;
	}

	params = kzalloc(params_size, GFP_KERNEL);
	if (!params) {
		err = -ENOMEM;
		goto exit;
	}
	BUG_ON(params_size + sizeof("escan") >= BRCMF_DCMD_MEDLEN);
	brcmf_escan_prep(&params->params_le, request);
	params->version = cpu_to_le32(BRCMF_ESCAN_REQ_VERSION);
	params->action = cpu_to_le16(action);
	params->sync_id = cpu_to_le16(0x1234);

	err = brcmf_fil_iovar_data_set(ndev, "escan", params, params_size);
	if (err) {
		if (err == -EBUSY)
			WL_INFO("system busy : escan canceled\n");
		else
			WL_ERR("error (%d)\n", err);
	}

	kfree(params);
exit:
	return err;
}

static s32
brcmf_do_escan(struct brcmf_cfg80211_info *cfg, struct wiphy *wiphy,
	       struct net_device *ndev, struct cfg80211_scan_request *request)
{
	s32 err;
	u32 passive_scan;
	struct brcmf_scan_results *results;

	WL_SCAN("Enter\n");
	cfg->escan_info.ndev = ndev;
	cfg->escan_info.wiphy = wiphy;
	cfg->escan_info.escan_state = WL_ESCAN_STATE_SCANNING;
	passive_scan = cfg->active_scan ? 0 : 1;
	err = brcmf_fil_cmd_int_set(ndev, BRCMF_C_SET_PASSIVE_SCAN,
				    passive_scan);
	if (err) {
		WL_ERR("error (%d)\n", err);
		return err;
	}
	brcmf_set_mpc(ndev, 0);
	results = (struct brcmf_scan_results *)cfg->escan_info.escan_buf;
	results->version = 0;
	results->count = 0;
	results->buflen = WL_ESCAN_RESULTS_FIXED_SIZE;

	err = brcmf_run_escan(cfg, ndev, request, WL_ESCAN_ACTION_START);
	if (err)
		brcmf_set_mpc(ndev, 1);
	return err;
}

static s32
brcmf_cfg80211_escan(struct wiphy *wiphy, struct net_device *ndev,
		     struct cfg80211_scan_request *request,
		     struct cfg80211_ssid *this_ssid)
{
	struct brcmf_cfg80211_info *cfg = ndev_to_cfg(ndev);
	struct cfg80211_ssid *ssids;
	struct brcmf_cfg80211_scan_req *sr = cfg->scan_req_int;
	u32 passive_scan;
	bool escan_req;
	bool spec_scan;
	s32 err;
	u32 SSID_len;

	WL_SCAN("START ESCAN\n");

	if (test_bit(WL_STATUS_SCANNING, &cfg->status)) {
		WL_ERR("Scanning already : status (%lu)\n", cfg->status);
		return -EAGAIN;
	}
	if (test_bit(WL_STATUS_SCAN_ABORTING, &cfg->status)) {
		WL_ERR("Scanning being aborted : status (%lu)\n",
		       cfg->status);
		return -EAGAIN;
	}
	if (test_bit(WL_STATUS_CONNECTING, &cfg->status)) {
		WL_ERR("Connecting : status (%lu)\n",
		       cfg->status);
		return -EAGAIN;
	}

	/* Arm scan timeout timer */
	mod_timer(&cfg->escan_timeout, jiffies +
			WL_ESCAN_TIMER_INTERVAL_MS * HZ / 1000);

	escan_req = false;
	if (request) {
		/* scan bss */
		ssids = request->ssids;
		escan_req = true;
	} else {
		/* scan in ibss */
		/* we don't do escan in ibss */
		ssids = this_ssid;
	}

	cfg->scan_request = request;
	set_bit(WL_STATUS_SCANNING, &cfg->status);
	if (escan_req) {
		err = brcmf_do_escan(cfg, wiphy, ndev, request);
		if (!err)
			return err;
		else
			goto scan_out;
	} else {
		WL_SCAN("ssid \"%s\", ssid_len (%d)\n",
		       ssids->ssid, ssids->ssid_len);
		memset(&sr->ssid_le, 0, sizeof(sr->ssid_le));
		SSID_len = min_t(u8, sizeof(sr->ssid_le.SSID), ssids->ssid_len);
		sr->ssid_le.SSID_len = cpu_to_le32(0);
		spec_scan = false;
		if (SSID_len) {
			memcpy(sr->ssid_le.SSID, ssids->ssid, SSID_len);
			sr->ssid_le.SSID_len = cpu_to_le32(SSID_len);
			spec_scan = true;
		} else
			WL_SCAN("Broadcast scan\n");