/*
 * 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.
 */


#ifndef FWEH_H_
#define FWEH_H_

#include <asm/unaligned.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/if.h>

/* formward declarations */
struct brcmf_pub;
struct brcmf_if;
struct brcmf_cfg80211_info;
struct brcmf_event;

/* list of firmware events */
#define BRCMF_FWEH_EVENT_ENUM_DEFLIST \
	BRCMF_ENUM_DEF(SET_SSID, 0) \
	BRCMF_ENUM_DEF(JOIN, 1) \
	BRCMF_ENUM_DEF(START, 2) \
	BRCMF_ENUM_DEF(AUTH, 3) \
	BRCMF_ENUM_DEF(AUTH_IND, 4) \
	BRCMF_ENUM_DEF(DEAUTH, 5) \
	BRCMF_ENUM_DEF(DEAUTH_IND, 6) \
	BRCMF_ENUM_DEF(ASSOC, 7) \
	BRCMF_ENUM_DEF(ASSOC_IND, 8) \
	BRCMF_ENUM_DEF(REASSOC, 9) \
	BRCMF_ENUM_DEF(REASSOC_IND, 10) \
	BRCMF_ENUM_DEF(DISASSOC, 11) \
	BRCMF_ENUM_DEF(DISASSOC_IND, 12) \
	BRCMF_ENUM_DEF(QUIET_START, 13) \
	BRCMF_ENUM_DEF(QUIET_END, 14) \
	BRCMF_ENUM_DEF(BEACON_RX, 15) \
	BRCMF_ENUM_DEF(LINK, 16) \
	BRCMF_ENUM_DEF(MIC_ERROR, 17) \
	BRCMF_ENUM_DEF(NDIS_LINK, 18) \
	BRCMF_ENUM_DEF(ROAM, 19) \
	BRCMF_ENUM_DEF(TXFAIL, 20) \
	BRCMF_ENUM_DEF(PMKID_CACHE, 21) \
	BRCMF_ENUM_DEF(RETROGRADE_TSF, 22) \
	BRCMF_ENUM_DEF(PRUNE, 23) \
	BRCMF_ENUM_DEF(AUTOAUTH, 24) \
	BRCMF_ENUM_DEF(EAPOL_MSG, 25) \
	BRCMF_ENUM_DEF(SCAN_COMPLETE, 26) \
	BRCMF_ENUM_DEF(ADDTS_IND, 27) \
	BRCMF_ENUM_DEF(DELTS_IND, 28) \
	BRCMF_ENUM_DEF(BCNSENT_IND, 29) \
	BRCMF_ENUM_DEF(BCNRX_MSG, 30) \
	BRCMF_ENUM_DEF(BCNLOST_MSG, 31) \
	BRCMF_ENUM_DEF(ROAM_PREP, 32) \
	BRCMF_ENUM_DEF(PFN_NET_FOUND, 33) \
	BRCMF_ENUM_DEF(PFN_NET_LOST, 34) \
	BRCMF_ENUM_DEF(RESET_COMPLETE, 35) \
	BRCMF_ENUM_DEF(JOIN_START, 36) \
	BRCMF_ENUM_DEF(ROAM_START, 37) \
	BRCMF_ENUM_DEF(ASSOC_START, 38) \
	BRCMF_ENUM_DEF(IBSS_ASSOC, 39) \
	BRCMF_ENUM_DEF(RADIO, 40) \
	BRCMF_ENUM_DEF(PSM_WATCHDOG, 41) \
	BRCMF_ENUM_DEF(PROBREQ_MSG, 44) \
	BRCMF_ENUM_DEF(SCAN_CONFIRM_IND, 45) \
	BRCMF_ENUM_DEF(PSK_SUP, 46) \
	BRCMF_ENUM_DEF(COUNTRY_CODE_CHANGED, 47) \
	BRCMF_ENUM_DEF(EXCEEDED_MEDIUM_TIME, 48) \
	BRCMF_ENUM_DEF(ICV_ERROR, 49) \
	BRCMF_ENUM_DEF(UNICAST_DECODE_ERROR, 50) \
	BRCMF_ENUM_DEF(MULTICAST_DECODE_ERROR, 51) \
	BRCMF_ENUM_DEF(TRACE, 52) \
	BRCMF_ENUM_DEF(IF, 54) \
	BRCMF_ENUM_DEF(P2P_DISC_LISTEN_COMPLETE, 55) \
	BRCMF_ENUM_DEF(RSSI, 56) \
	BRCMF_ENUM_DEF(PFN_SCAN_COMPLETE, 57) \
	BRCMF_ENUM_DEF(EXTLOG_MSG, 58) \
	BRCMF_ENUM_DEF(ACTION_FRAME, 59) \
	BRCMF_ENUM_DEF(ACTION_FRAME_COMPLETE, 60) \
	BRCMF_ENUM_DEF(PRE_ASSOC_IND, 61) \
	BRCMF_ENUM_DEF(PRE_REASSOC_IND, 62) \
	BRCMF_ENUM_DEF(CHANNEL_ADOPTED, 63) \
	BRCMF_ENUM_DEF(AP_STARTED, 64) \
	BRCMF_ENUM_DEF(DFS_AP_STOP, 65) \
	BRCMF_ENUM_DEF(DFS_AP_RESUME, 66) \
	BRCMF_ENUM_DEF(ESCAN_RESULT, 69) \
	BRCMF_ENUM_DEF(ACTION_FRAME_OFF_CHAN_COMPLETE, 70) \
	BRCMF_ENUM_DEF(PROBERESP_MSG, 71) \
	BRCMF_ENUM_DEF(P2P_PROBEREQ_MSG, 72) \
	BRCMF_ENUM_DEF(DCS_REQUEST, 73) \
	BRCMF_ENUM_DEF(FIFO_CREDIT_MAP, 74) \
	BRCMF_ENUM_DEF(ACTION_FRAME_RX, 75) \
	BRCMF_ENUM_DEF(BCMC_CREDIT_SUPPORT, 127)

#define BRCMF_ENUM_DEF(id, val) \
	BRCMF_E_##id = (val),

/* firmware event codes sent by the dongle */
enum brcmf_fweh_event_code {
	BRCMF_FWEH_EVENT_ENUM_DEFLIST
	BRCMF_E_LAST
};
#undef BRCMF_ENUM_DEF

/* flags field values in struct brcmf_event_msg */
#define BRCMF_EVENT_MSG_LINK		0x01
#define BRCMF_EVENT_MSG_FLUSHTXQ	0x02
#define BRCMF_EVENT_MSG_GROUP		0x04

/**
 * definitions for event packet validation.
 */
#define BRCMF_EVENT_OUI_OFFSET		19
#define BRCM_OUI			"\x00\x10\x18"
#define DOT11_OUI_LEN			3
#define BCMILCP_BCM_SUBTYPE_EVENT	1


/**
 * struct brcmf_event_msg - firmware event message.
 *
 * @version: version information.
 * @flags: event flags.
 * @event_code: firmware event code.
 * @status: status information.
 * @reason: reason code.
 * @auth_type: authentication type.
 * @datalen: lenght of event data buffer.
 * @addr: ether address.
 * @ifname: interface name.
 * @ifidx: interface index.
 * @bsscfgidx: bsscfg index.
 */
struct brcmf_event_msg {
	u16 version;
	u16 flags;
	u32 event_code;
	u32 status;
	u32 reason;
	s32 auth_type;
	u32 datalen;
	u8 addr[ETH_ALEN];
	char ifname[IFNAMSIZ];
	u8 ifidx;
	u8 bsscfgidx;
};

typedef int (*brcmf_fweh_handler_t)(struct brcmf_if *ifp,
				    const struct brcmf_event_msg *evtmsg,
				    void *data);

/**
 * struct brcmf_fweh_info - firmware event handling information.
 *
 * @event_work: event worker.
 * @evt_q_lock: lock for event queue protection.
 * @event_q: event queue.
 * @evt_handler: registered event handlers.
 */
struct brcmf_fweh_info {
	struct work_struct event_work;
	spinlock_t evt_q_lock;
	struct list_head event_q;
	int (*evt_handler[BRCMF_E_LAST])(struct brcmf_if *ifp,
					 const struct brcmf_event_msg *evtmsg,
					 void *data);
};

void brcmf_fweh_attach(struct brcmf_pub *drvr);
void brcmf_fweh_detach(struct brcmf_pub *drvr);
int brcmf_fweh_register(struct brcmf_pub *drvr, enum brcmf_fweh_event_code code,
			int (*handler)(struct brcmf_if *ifp,
				       const struct brcmf_event_msg *evtmsg,
				       void *data));
void brcmf_fweh_unregister(struct brcmf_pub *drvr,
			   enum brcmf_fweh_event_code code);
int brcmf_fweh_activate_events(struct brcmf_if *ifp);
void brcmf_fweh_process_event(struct brcmf_pub *drvr,
			      struct brcmf_event *event_packet);

static inline void brcmf_fweh_process_skb(struct brcmf_pub *drvr,
					  struct sk_buff *skb)
{
	struct brcmf_event *event_packet;
	u8 *data;
	u16 usr_stype;

	/* only process events when protocol matches */
	if (skb->protocol != cpu_to_be16(ETH_P_LINK_CTL))
		return;

	/* check for BRCM oui match */
	event_packet = (struct brcmf_event *)skb_mac_header(skb);
	data = (u8 *)event_packet;
	data += BRCMF_EVENT_OUI_OFFSET;
	if (memcmp(BRCM_OUI, data, DOT11_OUI_LEN))
		return;

	/* final match on usr_subtype */
	data += DOT11_OUI_LEN;
	usr_stype = get_unaligned_be16(data);
	if (usr_stype != BCMILCP_BCM_SUBTYPE_EVENT)
		return;

	brcmf_fweh_process_event(drvr, event_packet);
}

#endif /* FWEH_H_ */