/* 
 * Copyright (c) 2015 Nordic Semiconductor ASA
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 *   1. Redistributions of source code must retain the above copyright notice, this list 
 *      of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form, except as embedded into a Nordic Semiconductor ASA 
 *      integrated circuit in a product or a software update for such product, must reproduce 
 *      the above copyright notice, this list of conditions and the following disclaimer in 
 *      the documentation and/or other materials provided with the distribution.
 *
 *   3. Neither the name of Nordic Semiconductor ASA nor the names of its contributors may be 
 *      used to endorse or promote products derived from this software without specific prior 
 *      written permission.
 *
 *   4. This software, with or without modification, must only be used with a 
 *      Nordic Semiconductor ASA integrated circuit.
 *
 *   5. Any software provided in binary or object form under this license must not be reverse 
 *      engineered, decompiled, modified and/or disassembled. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */
#include "sdk_common.h"
#if NRF_MODULE_ENABLED(LPCOMP)
#include "nrf_drv_lpcomp.h"
#include "nrf_assert.h"
#include "nrf_error.h"
#include "nrf_soc.h"
#include "nrf_drv_common.h"
#include "app_util_platform.h"
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

#define NRF_LOG_MODULE_NAME "LPCOMP"

#if LPCOMP_CONFIG_LOG_ENABLED
#define NRF_LOG_LEVEL       LPCOMP_CONFIG_LOG_LEVEL
#define NRF_LOG_INFO_COLOR  LPCOMP_CONFIG_INFO_COLOR
#define NRF_LOG_DEBUG_COLOR LPCOMP_CONFIG_DEBUG_COLOR
#define EVT_TO_STR(event)   (event == NRF_LPCOMP_EVENT_READY ? "NRF_LPCOMP_EVENT_READY" :                \
                            (event == NRF_LPCOMP_EVENT_DOWN ? "NRF_LPCOMP_EVENT_DOWN" :                  \
                            (event == NRF_LPCOMP_EVENT_UP ? "NRF_LPCOMP_EVENT_UP" :                      \
                            (event == NRF_LPCOMP_EVENT_CROSS ? "NRF_LPCOMP_EVENT_CROSS" : "UNKNOWN EVENT"))))
#else //LPCOMP_CONFIG_LOG_ENABLED
#define EVT_TO_STR(event)   ""
#define NRF_LOG_LEVEL       0
#endif //LPCOMP_CONFIG_LOG_ENABLED
#include "nrf_log.h"
#include "nrf_log_ctrl.h"


static lpcomp_events_handler_t m_lpcomp_events_handler = NULL;
static nrf_drv_state_t         m_state = NRF_DRV_STATE_UNINITIALIZED;

#if NRF_MODULE_ENABLED(PERIPHERAL_RESOURCE_SHARING)
    #define IRQ_HANDLER_NAME     irq_handler_for_lpcomp
    #define IRQ_HANDLER          static void IRQ_HANDLER_NAME(void)

    IRQ_HANDLER;
#else
    #define IRQ_HANDLER void LPCOMP_IRQHandler(void)
#endif // NRF_MODULE_ENABLED(PERIPHERAL_RESOURCE_SHARING)

static void lpcomp_execute_handler(nrf_lpcomp_event_t event, uint32_t event_mask)
{
    if ( nrf_lpcomp_event_check(event) && nrf_lpcomp_int_enable_check(event_mask) )
    {
        nrf_lpcomp_event_clear(event);
        NRF_LOG_DEBUG("Event: %s.\r\n", (uint32_t)EVT_TO_STR(event));

        m_lpcomp_events_handler(event);
    }
}


IRQ_HANDLER
{
    lpcomp_execute_handler(NRF_LPCOMP_EVENT_READY, LPCOMP_INTENSET_READY_Msk);
    lpcomp_execute_handler(NRF_LPCOMP_EVENT_DOWN, LPCOMP_INTENSET_DOWN_Msk);
    lpcomp_execute_handler(NRF_LPCOMP_EVENT_UP, LPCOMP_INTENSET_UP_Msk);
    lpcomp_execute_handler(NRF_LPCOMP_EVENT_CROSS, LPCOMP_INTENSET_CROSS_Msk);
}


ret_code_t nrf_drv_lpcomp_init(const nrf_drv_lpcomp_config_t * p_config,
                               lpcomp_events_handler_t   events_handler)
{
    ASSERT(p_config);
    ret_code_t err_code;

    if (m_state != NRF_DRV_STATE_UNINITIALIZED)
    { // LPCOMP driver is already initialized
        err_code = NRF_ERROR_INVALID_STATE;
        NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
        return err_code;
    }

#if NRF_MODULE_ENABLED(PERIPHERAL_RESOURCE_SHARING)
    if (nrf_drv_common_per_res_acquire(NRF_LPCOMP, IRQ_HANDLER_NAME) != NRF_SUCCESS)
    {
        err_code = NRF_ERROR_BUSY;
        NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
        return err_code;
    }
#endif

    nrf_lpcomp_configure(&(p_config->hal) );

    if (events_handler)
    {
        m_lpcomp_events_handler = events_handler;
    }
    else
    {
        err_code = NRF_ERROR_INVALID_PARAM;
        NRF_LOG_WARNING("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
        return err_code;
    }

    nrf_lpcomp_input_select(p_config->input);

    switch (p_config->hal.detection)
    {
        case NRF_LPCOMP_DETECT_UP:
            nrf_lpcomp_int_enable(LPCOMP_INTENSET_UP_Msk);
            break;

        case NRF_LPCOMP_DETECT_DOWN:
            nrf_lpcomp_int_enable(LPCOMP_INTENSET_DOWN_Msk);
            break;

        case NRF_LPCOMP_DETECT_CROSS:
            nrf_lpcomp_int_enable(LPCOMP_INTENSET_CROSS_Msk);
            break;

        default:
            break;
    }
    nrf_lpcomp_shorts_enable(NRF_LPCOMP_SHORT_READY_SAMPLE_MASK);

    nrf_drv_common_irq_enable(LPCOMP_IRQn, p_config->interrupt_priority);

    m_state = NRF_DRV_STATE_INITIALIZED;

    err_code = NRF_SUCCESS;
    NRF_LOG_INFO("Function: %s, error code: %s.\r\n", (uint32_t)__func__, (uint32_t)ERR_TO_STR(err_code));
    return err_code;
}


void nrf_drv_lpcomp_uninit(void)
{
    ASSERT(m_state != NRF_DRV_STATE_UNINITIALIZED);
    nrf_drv_common_irq_disable(LPCOMP_IRQn);
    nrf_drv_lpcomp_disable();
#if NRF_MODULE_ENABLED(PERIPHERAL_RESOURCE_SHARING)
    nrf_drv_common_per_res_release(NRF_LPCOMP);
#endif
    m_state = NRF_DRV_STATE_UNINITIALIZED;
    m_lpcomp_events_handler = NULL;
    NRF_LOG_INFO("Uninitialized.\r\n");
}

void nrf_drv_lpcomp_enable(void)
{
    ASSERT(m_state == NRF_DRV_STATE_INITIALIZED);
    nrf_lpcomp_enable();
    nrf_lpcomp_task_trigger(NRF_LPCOMP_TASK_START);
    m_state = NRF_DRV_STATE_POWERED_ON;
    NRF_LOG_INFO("Enabled.\r\n");
}

void nrf_drv_lpcomp_disable(void)
{
    ASSERT(m_state == NRF_DRV_STATE_POWERED_ON);
    nrf_lpcomp_disable();
    nrf_lpcomp_task_trigger(NRF_LPCOMP_TASK_STOP);
    m_state = NRF_DRV_STATE_POWERED_ON;
    NRF_LOG_INFO("Disabled.\r\n");
}

void nrf_drv_lpcomp_event_handler_register(lpcomp_events_handler_t lpcomp_events_handler)
{
    m_lpcomp_events_handler = lpcomp_events_handler;
}

#endif //NRF_MODULE_ENABLED(LPCOMP)
