/*
 * Copyright (C) 2016 Phytec Messtechnik GmbH
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

/**
 * @defgroup    drivers_kw2xrf KW2x radio-driver
 * @ingroup     drivers_netdev
 * @brief       Device driver for the NXP CR20A and KW2xD radios
 * @{
 *
 * @file
 * @brief       Interface definition for the kw2xrf driver
 *
 * @author      Johann Fischer <j.fischer@phytec.de>
 * @author      Jonas Remmert <j.remmert@phytec.de>
 * @author      Sebastian Meiling <s@mlng.net>
 */

#ifndef KW2XRF_H
#define KW2XRF_H

#include <stdint.h>

#include "board.h"
#include "periph/spi.h"
#include "periph/gpio.h"
#include "net/netdev.h"
#include "net/netdev/ieee802154.h"
#include "net/gnrc/nettype.h"
#include "thread.h"
#include "net/ieee802154/radio.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @brief   Maximum packet length
 */
#define KW2XRF_MAX_PKT_LENGTH           (IEEE802154_FRAME_LEN_MAX)

/**
 * @defgroup drivers_kw2xrf_config     CR20A and KW2xD radio driver compile configuration
 * @ingroup config_drivers_netdev
 * @{
 */
/**
 * @brief Default channel used after initialization.
 */
#ifndef KW2XRF_DEFAULT_CHANNEL
#define KW2XRF_DEFAULT_CHANNEL          (CONFIG_IEEE802154_DEFAULT_CHANNEL)
#endif
/** @} */

/**
 * @name    Allowed range of channels
 *
 * @{
 */
#define KW2XRF_MIN_CHANNEL              (11U)
#define KW2XRF_MAX_CHANNEL              (26U)
/** @} */

/**
 * @brief   Default TX_POWER in dbm used after initialization
 */
#define KW2XRF_DEFAULT_TX_POWER         (CONFIG_IEEE802154_DEFAULT_TXPOWER)

/**
 * @brief   Maximum output power of the kw2x device in dBm
 */
#define KW2XDRF_OUTPUT_POWER_MAX       (8)

/**
 * @brief   Minimum output power of the kw2x device in dBm
 */
#define KW2XDRF_OUTPUT_POWER_MIN       (-35)

/**
 * @brief   Internal device option flags
 *
 * `0x00ff` is reserved for general IEEE 802.15.4 flags
 * (see @ref netdev_ieee802154_t)
 *
 * @{
 */
#define KW2XRF_OPT_SRC_ADDR_LONG    (NETDEV_IEEE802154_SRC_MODE_LONG)  /**< legacy define */
#define KW2XRF_OPT_RAWDUMP          (NETDEV_IEEE802154_RAW)            /**< legacy define */
#define KW2XRF_OPT_ACK_REQ          (NETDEV_IEEE802154_ACK_REQ)        /**< legacy define */

#define KW2XRF_OPT_AUTOCCA          (0x0100)    /**< CCA before TX active */
#define KW2XRF_OPT_PROMISCUOUS      (0x0200)    /**< promiscuous mode
                                                  *   active */
#define KW2XRF_OPT_PRELOADING       (0x0400)    /**< preloading enabled */
#define KW2XRF_OPT_AUTOACK          (0x8000)    /**< enable automatically ACK
                                                  *   for incommint packet */
/** @} */

/**
 * @brief   Struct holding all params needed for device initialization
 */
typedef struct kw2xrf_params {
    spi_t spi;                          /**< SPI bus the device is connected to */
    spi_clk_t spi_clk;                  /**< SPI clock speed to use */
    gpio_t cs_pin;                      /**< GPIO pin connected to chip select */
    gpio_t int_pin;                     /**< GPIO pin connected to the interrupt pin */
    gpio_t rst_pin;                     /**< GPIO pin connected to RST_B */
} kw2xrf_params_t;

/**
 * @brief   Device descriptor for KW2XRF radio devices
 *
 * @extends netdev_ieee802154_t
 */
typedef struct {
    /**
     * @brief   device specific fields
     * @{
     */
    thread_t *thread;                   /**< Network driver thread, for providing feedback from IRQ handler */
    const kw2xrf_params_t *params;      /**< parameters for initialization */
    uint8_t buf[KW2XRF_MAX_PKT_LENGTH]; /**< Buffer for incoming or outgoing packets */
    uint8_t state;                      /**< current state of the radio */
    uint8_t tx_frame_len;               /**< length of the current TX frame */
    uint8_t idle_state;                 /**< state to return to after sending */
    uint8_t pending_tx;                 /**< keep track of pending TX calls
                                             this is required to know when to
                                             return to @ref kw2xrf_t::idle_state */
    int16_t tx_power;                   /**< The current tx-power setting of the device */
    bool    ack_requested;              /**< ACK was requested for last frame */
    bool    ch_clear;                   /**< CCA indicated channel clear */
    bool    waiting_for_cca;            /**< Indicate whether CCA is still ongoing */
    bool    tx_done;                    /**< Indicate whether TX completed */
    bool    ack_rcvd;                   /**< Indicate if ACK was received for last transmission */
    bool    cca_before_tx;              /**< true if CCA shall be performed before TX */
    bool    tx_cca_pending;             /**< true a manual CCA was started and a TX should be triggered on channel clear indication */
    /** @} */
} kw2xrf_t;

/**
 * @brief   Initialize the given KW2XRF device
 * @param[out] dev          device descriptor
 * @param[in]  params       parameters for device initialization
 * @param[in]  hal          pointer to IEEE 802.15.4 Radio HAL descriptor
 * @param[in]  cb           isr callback
 * @param[in]  ctx          context pointer handed to isr
 *
 * @return                  0 on success
 * @return                  <0 on error
 */
int kw2xrf_init(kw2xrf_t *dev, const kw2xrf_params_t *params, ieee802154_dev_t *hal,
                gpio_cb_t cb, void *ctx);

/**
 * @brief   Configure radio with default values
 *
 * @param[in] dev           device to reset
 */
void kw2xrf_reset_phy(kw2xrf_t *dev);

/**
 * @brief   IRQ Handler for the KW2XRF device
 *
 * @param[in] dev           pointer to the IEEE 802.15.4 Radio HAL descriptor
 */
void kw2xrf_radio_hal_irq_handler(void *dev);

#ifdef __cplusplus
}
#endif

#endif /* KW2XRF_H */
/** @} */