/*
 * Broadcom Dongle Host Driver (DHD), RTT
 *
 * Copyright (C) 1999-2017, Broadcom Corporation
 * 
 *      Unless you and Broadcom execute a separate written software license
 * agreement governing use of this software, this software is licensed to you
 * under the terms of the GNU General Public License version 2 (the "GPL"),
 * available at http://www.broadcom.com/licenses/GPLv2.php, with the
 * following added to such license:
 * 
 *      As a special exception, the copyright holders of this software give you
 * permission to link this software with independent modules, and to copy and
 * distribute the resulting executable under terms of your choice, provided that
 * you also meet, for each linked independent module, the terms and conditions of
 * the license of that module.  An independent module is a module which is not
 * derived from this software.  The special exception does not apply to any
 * modifications of the software.
 * 
 *      Notwithstanding the above, under no circumstances may you combine this
 * software in any way with any other Broadcom software provided under a license
 * other than the GPL, without Broadcom's express prior written consent.
 *
 *
 * <<Broadcom-WL-IPTag/Open:>>
 *
 * $Id$
 */
#ifndef __DHD_RTT_H__
#define __DHD_RTT_H__

#include "dngl_stats.h"

#define RTT_MAX_TARGET_CNT 50
#define RTT_MAX_FRAME_CNT 25
#define RTT_MAX_RETRY_CNT 10
#define DEFAULT_FTM_CNT 6
#define DEFAULT_RETRY_CNT 6
#define DEFAULT_FTM_FREQ 5180
#define DEFAULT_FTM_CNTR_FREQ0 5210

#define TARGET_INFO_SIZE(count) (sizeof(rtt_target_info_t) * count)

#define TARGET_TYPE(target) (target->type)

#ifndef BIT
#define BIT(x) (1 << (x))
#endif

/* DSSS, CCK and 802.11n rates in [500kbps] units */
#define WL_MAXRATE	108	/* in 500kbps units */
#define WL_RATE_1M	2	/* in 500kbps units */
#define WL_RATE_2M	4	/* in 500kbps units */
#define WL_RATE_5M5	11	/* in 500kbps units */
#define WL_RATE_11M	22	/* in 500kbps units */
#define WL_RATE_6M	12	/* in 500kbps units */
#define WL_RATE_9M	18	/* in 500kbps units */
#define WL_RATE_12M	24	/* in 500kbps units */
#define WL_RATE_18M	36	/* in 500kbps units */
#define WL_RATE_24M	48	/* in 500kbps units */
#define WL_RATE_36M	72	/* in 500kbps units */
#define WL_RATE_48M	96	/* in 500kbps units */
#define WL_RATE_54M	108	/* in 500kbps units */
#define GET_RTTSTATE(dhd) ((rtt_status_info_t *)dhd->rtt_state)

enum rtt_role {
	RTT_INITIATOR = 0,
	RTT_TARGET = 1
};
enum rtt_status {
	RTT_STOPPED = 0,
	RTT_STARTED = 1,
	RTT_ENABLED = 2
};
typedef int64_t wifi_timestamp; /* In microseconds (us) */
typedef int64_t wifi_timespan;
typedef int32 wifi_rssi_rtt;

typedef enum {
	RTT_INVALID,
	RTT_ONE_WAY,
	RTT_TWO_WAY,
	RTT_AUTO
} rtt_type_t;

typedef enum {
	RTT_PEER_STA,
	RTT_PEER_AP,
	RTT_PEER_P2P,
	RTT_PEER_NAN,
	RTT_PEER_INVALID
} rtt_peer_type_t;

typedef enum rtt_reason {
    RTT_REASON_SUCCESS,
    RTT_REASON_FAILURE,
    RTT_REASON_FAIL_NO_RSP,
    RTT_REASON_FAIL_INVALID_TS, /* Invalid timestamp */
    RTT_REASON_FAIL_PROTOCOL, /* 11mc protocol failed */
    RTT_REASON_FAIL_REJECTED,
    RTT_REASON_FAIL_NOT_SCHEDULED_YET,
    RTT_REASON_FAIL_SCHEDULE, /* schedule failed */
    RTT_REASON_FAIL_TM_TIMEOUT,
    RTT_REASON_FAIL_AP_ON_DIFF_CHANNEL,
    RTT_REASON_FAIL_NO_CAPABILITY,
    RTT_REASON_FAIL_BUSY_TRY_LATER,
    RTT_REASON_ABORTED
} rtt_reason_t;

enum {
	RTT_CAP_ONE_WAY	 = BIT(0),
	/* IEEE802.11mc */
	RTT_CAP_FTM_WAY  = BIT(1)
};

enum {
	RTT_FEATURE_LCI = BIT(0),
	RTT_FEATURE_LCR = BIT(1),
	RTT_FEATURE_PREAMBLE = BIT(2),
	RTT_FEATURE_BW = BIT(3)
};

enum {
	RTT_PREAMBLE_LEGACY = BIT(0),
	RTT_PREAMBLE_HT = BIT(1),
	RTT_PREAMBLE_VHT = BIT(2)
};


enum {
	RTT_BW_5 = BIT(0),
	RTT_BW_10 = BIT(1),
	RTT_BW_20 = BIT(2),
	RTT_BW_40 = BIT(3),
	RTT_BW_80 = BIT(4),
	RTT_BW_160 = BIT(5)
};
#define FTM_MAX_NUM_BURST_EXP	14
#define HAS_11MC_CAP(cap) (cap & RTT_CAP_FTM_WAY)
#define HAS_ONEWAY_CAP(cap) (cap & RTT_CAP_ONE_WAY)
#define HAS_RTT_CAP(cap) (HAS_ONEWAY_CAP(cap) || HAS_11MC_CAP(cap))

typedef struct wifi_channel_info {
	wifi_channel_width_t width;
	wifi_channel center_freq; /* primary 20 MHz channel */
	wifi_channel center_freq0; /* center freq (MHz) first segment */
	wifi_channel center_freq1; /* center freq (MHz) second segment valid for 80 + 80 */
} wifi_channel_info_t;

typedef struct wifi_rate {
	uint32 preamble :3; /* 0: OFDM, 1: CCK, 2 : HT, 3: VHT, 4..7 reserved */
	uint32 nss		:2; /* 1 : 1x1, 2: 2x2, 3: 3x3, 4: 4x4 */
	uint32 bw		:3; /* 0: 20Mhz, 1: 40Mhz, 2: 80Mhz, 3: 160Mhz */
	/* OFDM/CCK rate code would be as per IEEE std in the unit of 0.5 mb
	* HT/VHT it would be mcs index
	*/
	uint32 rateMcsIdx :8;
	uint32 reserved :16; /* reserved */
	uint32 bitrate;	/* unit of 100 Kbps */
} wifi_rate_t;

typedef struct rtt_target_info {
	struct ether_addr addr;
	rtt_type_t type; /* rtt_type */
	rtt_peer_type_t peer; /* peer type */
	wifi_channel_info_t channel; /* channel information */
	chanspec_t chanspec; /* chanspec for channel */
	bool	disable; /* disable for RTT measurement */
	/*
	* Time interval between bursts (units: 100 ms).
	* Applies to 1-sided and 2-sided RTT multi-burst requests.
	* Range: 0-31, 0: no preference by initiator (2-sided RTT)
	*/
	uint32	burst_period;
	/*
	* Total number of RTT bursts to be executed. It will be
	* specified in the same way as the parameter "Number of
	* Burst Exponent" found in the FTM frame format. It
	* applies to both: 1-sided RTT and 2-sided RTT. Valid
	* values are 0 to 15 as defined in 802.11mc std.
	* 0 means single shot
	* The implication of this parameter on the maximum
	* number of RTT results is the following:
	* for 1-sided RTT: max num of RTT results = (2^num_burst)*(num_frames_per_burst)
	* for 2-sided RTT: max num of RTT results = (2^num_burst)*(num_frames_per_burst - 1)
	*/
	uint16 num_burst;
	/*
	* num of frames per burst.
	* Minimum value = 1, Maximum value = 31
	* For 2-sided this equals the number of FTM frames
	* to be attempted in a single burst. This also
	* equals the number of FTM frames that the
	* initiator will request that the responder send
	* in a single frame
	*/
    uint32 num_frames_per_burst;
	/* num of frames in each RTT burst
	 * for single side, measurement result num = frame number
	 * for 2 side RTT, measurement result num  = frame number - 1
	 */
	uint32 num_retries_per_ftm; /* retry time for RTT measurment frame */
	/* following fields are only valid for 2 side RTT */
	uint32 num_retries_per_ftmr;
	uint8  LCI_request;
	uint8  LCR_request;
	/*
	* Applies to 1-sided and 2-sided RTT. Valid values will
	* be 2-11 and 15 as specified by the 802.11mc std for
	* the FTM parameter burst duration. In a multi-burst
	* request, if responder overrides with larger value,
	* the initiator will return failure. In a single-burst
	* request if responder overrides with larger value,
	* the initiator will sent TMR_STOP to terminate RTT
	* at the end of the burst_duration it requested.
	*/
	uint32 burst_duration;
	uint8  preamble; /* 1 - Legacy, 2 - HT, 4 - VHT */
	uint8  bw;  /* 5, 10, 20, 40, 80, 160 */
} rtt_target_info_t;

typedef struct rtt_config_params {
	int8 rtt_target_cnt;
	rtt_target_info_t *target_info;
} rtt_config_params_t;

typedef struct rtt_status_info {
    dhd_pub_t *dhd;
    int8 status;   /* current status for the current entry */
    int8 txchain; /* current device tx chain */
    int8 mpc; /* indicate we change mpc mode */
    int pm; /* to save current value of pm */
    int8 pm_restore; /* flag to reset the old value of pm */
    int8 cur_idx; /* current entry to do RTT */
    bool all_cancel; /* cancel all request once we got the cancel requet */
    uint32 flags; /* indicate whether device is configured as initiator or target */
    struct capability {
		int32 proto     :8;
		int32 feature   :8;
		int32 preamble  :8;
		int32 bw        :8;
	} rtt_capa; /* rtt capability */
    struct mutex rtt_mutex;
    rtt_config_params_t rtt_config;
    struct work_struct work;
    struct list_head noti_fn_list;
    struct list_head rtt_results_cache; /* store results for RTT */
} rtt_status_info_t;

typedef struct rtt_report {
	struct ether_addr addr;
	unsigned int burst_num; /* # of burst inside a multi-burst request */
	unsigned int ftm_num; /* total RTT measurement frames attempted */
	unsigned int success_num; /* total successful RTT measurement frames */
	uint8  num_per_burst_peer; /* max number of FTM number per burst the peer support */
	rtt_reason_t status; /* raging status */
	/* in s, 11mc only, only for RTT_REASON_FAIL_BUSY_TRY_LATER, 1- 31s */
	uint8 retry_after_duration;
	rtt_type_t type; /* rtt type */
	wifi_rssi_rtt  rssi; /* average rssi in 0.5 dB steps e.g. 143 implies -71.5 dB */
	wifi_rssi_rtt  rssi_spread; /* rssi spread in 0.5 db steps e.g. 5 implies 2.5 spread */
	/*
	* 1-sided RTT: TX rate of RTT frame.
	* 2-sided RTT: TX rate of initiator's Ack in response to FTM frame.
	*/
	wifi_rate_t tx_rate;
	/*
	* 1-sided RTT: TX rate of Ack from other side.
	* 2-sided RTT: TX rate of FTM frame coming from responder.
	*/
	wifi_rate_t rx_rate;
	wifi_timespan rtt;	/*  round trip time in 0.1 nanoseconds */
	wifi_timespan rtt_sd;	/* rtt standard deviation in 0.1 nanoseconds */
	wifi_timespan rtt_spread; /* difference between max and min rtt times recorded */
	int distance; /* distance in cm (optional) */
	int distance_sd; /* standard deviation in cm (optional) */
	int distance_spread; /* difference between max and min distance recorded (optional) */
	wifi_timestamp ts; /* time of the measurement (in microseconds since boot) */
	int burst_duration; /* in ms, how long the FW time is to fininish one burst measurement */
	int negotiated_burst_num; /* Number of bursts allowed by the responder */
	bcm_tlv_t *LCI; /* LCI Report */
	bcm_tlv_t *LCR; /* Location Civic Report */
} rtt_report_t;
#define RTT_REPORT_SIZE (sizeof(rtt_report_t))

/* rtt_results_header to maintain rtt result list per mac address */
typedef struct rtt_results_header {
	struct ether_addr peer_mac;
	uint32 result_cnt;
	uint32 result_tot_len; /* sum of report_len of rtt_result */
	struct list_head list;
	struct list_head result_list;
} rtt_results_header_t;

/* rtt_result to link all of rtt_report */
typedef struct rtt_result {
	struct list_head list;
	struct rtt_report report;
	int32 report_len; /* total length of rtt_report */
} rtt_result_t;

/* RTT Capabilities */
typedef struct rtt_capabilities {
	uint8 rtt_one_sided_supported;  /* if 1-sided rtt data collection is supported */
	uint8 rtt_ftm_supported;        /* if ftm rtt data collection is supported */
	uint8 lci_support;		/* location configuration information */
	uint8 lcr_support;		/* Civic Location */
	uint8 preamble_support;         /* bit mask indicate what preamble is supported */
	uint8 bw_support;               /* bit mask indicate what BW is supported */
} rtt_capabilities_t;


/* RTT responder information */
typedef struct wifi_rtt_responder {
	wifi_channel_info channel;   /* channel of responder */
	uint8 preamble;             /* preamble supported by responder */
} wifi_rtt_responder_t;

typedef void (*dhd_rtt_compl_noti_fn)(void *ctx, void *rtt_data);
/* Linux wrapper to call common dhd_rtt_set_cfg */
int
dhd_dev_rtt_set_cfg(struct net_device *dev, void *buf);

int
dhd_dev_rtt_cancel_cfg(struct net_device *dev, struct ether_addr *mac_list, int mac_cnt);

int
dhd_dev_rtt_register_noti_callback(struct net_device *dev, void *ctx,
	dhd_rtt_compl_noti_fn noti_fn);

int
dhd_dev_rtt_unregister_noti_callback(struct net_device *dev, dhd_rtt_compl_noti_fn noti_fn);

int
dhd_dev_rtt_capability(struct net_device *dev, rtt_capabilities_t *capa);

#ifdef WL_CFG80211
int
dhd_dev_rtt_avail_channel(struct net_device *dev, wifi_channel_info *channel_info);
#endif /* WL_CFG80211 */

int
dhd_dev_rtt_enable_responder(struct net_device *dev, wifi_channel_info *channel_info);

int
dhd_dev_rtt_cancel_responder(struct net_device *dev);
/* export to upper layer */
chanspec_t
dhd_rtt_convert_to_chspec(wifi_channel_info_t channel);

int
dhd_rtt_idx_to_burst_duration(uint idx);

int
dhd_rtt_set_cfg(dhd_pub_t *dhd, rtt_config_params_t *params);

int
dhd_rtt_stop(dhd_pub_t *dhd, struct ether_addr *mac_list, int mac_cnt);


int
dhd_rtt_register_noti_callback(dhd_pub_t *dhd, void *ctx, dhd_rtt_compl_noti_fn noti_fn);

int
dhd_rtt_unregister_noti_callback(dhd_pub_t *dhd, dhd_rtt_compl_noti_fn noti_fn);

int
dhd_rtt_event_handler(dhd_pub_t *dhd, wl_event_msg_t *event, void *event_data);

int
dhd_rtt_capability(dhd_pub_t *dhd, rtt_capabilities_t *capa);

int
dhd_rtt_avail_channel(dhd_pub_t *dhd, wifi_channel_info *channel_info);

int
dhd_rtt_enable_responder(dhd_pub_t *dhd, wifi_channel_info *channel_info);

int
dhd_rtt_cancel_responder(dhd_pub_t *dhd);

int
dhd_rtt_init(dhd_pub_t *dhd);

int
dhd_rtt_deinit(dhd_pub_t *dhd);
#endif /* __DHD_RTT_H__ */