/*
 * Copyright (c) 2017, George Oikonomou - http://www.spd.gr
 * 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 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 the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 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.
 */
/*---------------------------------------------------------------------------*/
/**
 * \addtogroup cc26xx-gpio-hal
 * @{
 *
 * \file
 *     Implementation file for the CC13xx/CC26xx GPIO HAL functions
 */
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "dev/gpio-hal.h"

#include <ti/devices/DeviceFamily.h>
#include DeviceFamily_constructPath(driverlib/gpio.h)

#include <ti/drivers/PIN.h>
#include <ti/drivers/pin/PINCC26XX.h>

#include <stdint.h>
/*---------------------------------------------------------------------------*/
static PIN_Config pin_config[] =
{
  PIN_TERMINATE
};

static PIN_State  pin_state;
static PIN_Handle pin_handle;
/*---------------------------------------------------------------------------*/
static void
from_hal_cfg(gpio_hal_pin_cfg_t cfg, PIN_Config *pin_cfg, PIN_Config *pin_mask)
{
  cfg &= GPIO_HAL_PIN_BM_ALL;

  /* Input config */
  if (cfg & GPIO_HAL_PIN_BM_INPUT) {
    *pin_mask |= PIN_BM_INPUT_MODE;

    if ((cfg & GPIO_HAL_PIN_BM_INPUT_HYSTERESIS) == GPIO_HAL_PIN_CFG_INPUT_HYSTERESIS) {
      *pin_cfg |= PIN_HYSTERESIS;
    }

    switch (cfg & GPIO_HAL_PIN_BM_INPUT_PULLING) {
    case GPIO_HAL_PIN_CFG_INPUT_NOPULL:   *pin_cfg |= PIN_NOPULL;   break;
    case GPIO_HAL_PIN_CFG_INPUT_PULLUP:   *pin_cfg |= PIN_PULLUP;   break;
    case GPIO_HAL_PIN_CFG_INPUT_PULLDOWN: *pin_cfg |= PIN_PULLDOWN; break;
    }
  }

  /* Output config */
  if (cfg & GPIO_HAL_PIN_BM_OUTPUT) {
    *pin_mask |= PIN_BM_OUTPUT_MODE;

    switch (cfg & GPIO_HAL_PIN_BM_OUTPUT_BUF) {
    case GPIO_HAL_PIN_CFG_OUTPUT_PUSHPULL:   *pin_cfg |= PIN_PUSHPULL;   break;
    case GPIO_HAL_PIN_CFG_OUTPUT_OPENDRAIN:  *pin_cfg |= PIN_OPENDRAIN;  break;
    case GPIO_HAL_PIN_CFG_OUTPUT_OPENSOURCE: *pin_cfg |= PIN_OPENSOURCE; break;
    }

    if ((cfg & GPIO_HAL_PIN_BM_OUTPUT_SLEWCTRL) == GPIO_HAL_PIN_CFG_OUTPUT_SLEWCTRL) {
      *pin_cfg |= PIN_SLEWCTRL;
    }

    switch (cfg & GPIO_HAL_PIN_BM_OUTPUT_DRVSTR) {
    case GPIO_HAL_PIN_CFG_OUTPUT_DRVSTR_MIN: *pin_cfg |= PIN_DRVSTR_MIN; break;
    case GPIO_HAL_PIN_CFG_OUTPUT_DRVSTR_MED: *pin_cfg |= PIN_DRVSTR_MED; break;
    case GPIO_HAL_PIN_CFG_OUTPUT_DRVSTR_MAX: *pin_cfg |= PIN_DRVSTR_MAX; break;
    }
  }

  /* Interrupt config */
  if (cfg & GPIO_HAL_PIN_BM_INT) {
    *pin_mask |= PIN_BM_IRQ;

    switch (cfg & GPIO_HAL_PIN_BM_OUTPUT_BUF) {
    case GPIO_HAL_PIN_CFG_INT_DISABLE: *pin_cfg |= PIN_IRQ_DIS;       break;
    case GPIO_HAL_PIN_CFG_INT_FALLING: *pin_cfg |= PIN_IRQ_NEGEDGE;   break;
    case GPIO_HAL_PIN_CFG_INT_RISING:  *pin_cfg |= PIN_IRQ_POSEDGE;   break;
    case GPIO_HAL_PIN_CFG_INT_BOTH:    *pin_cfg |= PIN_IRQ_BOTHEDGES; break;
    }
  }
}
/*---------------------------------------------------------------------------*/
static void
to_hal_cfg(PIN_Config pin_cfg, gpio_hal_pin_cfg_t *cfg)
{
  /* Input config */
  if (pin_cfg & PIN_BM_INPUT_MODE) {
    if ((pin_cfg & PIN_BM_HYSTERESIS) == PIN_HYSTERESIS) {
      *cfg |= GPIO_HAL_PIN_BM_INPUT_HYSTERESIS;
    }

    switch (pin_cfg & PIN_BM_PULLING) {
    case PIN_NOPULL:   *cfg |= GPIO_HAL_PIN_CFG_INPUT_NOPULL;   break;
    case PIN_PULLUP:   *cfg |= GPIO_HAL_PIN_CFG_INPUT_PULLUP;   break;
    case PIN_PULLDOWN: *cfg |= GPIO_HAL_PIN_CFG_INPUT_PULLDOWN; break;
    }
  }

  /* Output config */
  if (pin_cfg & PIN_BM_OUTPUT_MODE) {
    switch (pin_cfg & PIN_BM_OUTPUT_BUF) {
    case PIN_PUSHPULL:   *cfg |= GPIO_HAL_PIN_CFG_OUTPUT_PUSHPULL;   break;
    case PIN_OPENDRAIN:  *cfg |= GPIO_HAL_PIN_CFG_OUTPUT_OPENDRAIN;  break;
    case PIN_OPENSOURCE: *cfg |= GPIO_HAL_PIN_CFG_OUTPUT_OPENSOURCE; break;
    }

    if ((pin_cfg & PIN_BM_SLEWCTRL) == PIN_SLEWCTRL) {
      *cfg |= GPIO_HAL_PIN_CFG_OUTPUT_SLEWCTRL;
    }

    switch (pin_cfg & PIN_BM_DRVSTR) {
    case PIN_DRVSTR_MIN: *cfg |= GPIO_HAL_PIN_CFG_OUTPUT_DRVSTR_MIN; break;
    case PIN_DRVSTR_MED: *cfg |= GPIO_HAL_PIN_CFG_OUTPUT_DRVSTR_MED; break;
    case PIN_DRVSTR_MAX: *cfg |= GPIO_HAL_PIN_CFG_OUTPUT_DRVSTR_MAX; break;
    }
  }

  /* Interrupt config */
  if (pin_cfg & PIN_BM_IRQ) {
    switch (pin_cfg & PIN_BM_IRQ) {
    case PIN_IRQ_DIS:       *cfg |= GPIO_HAL_PIN_CFG_INT_DISABLE; break;
    case PIN_IRQ_NEGEDGE:   *cfg |= GPIO_HAL_PIN_CFG_INT_FALLING; break;
    case PIN_IRQ_POSEDGE:   *cfg |= GPIO_HAL_PIN_CFG_INT_RISING;  break;
    case PIN_IRQ_BOTHEDGES: *cfg |= GPIO_HAL_PIN_CFG_INT_BOTH;    break;
    }
  }
}
/*---------------------------------------------------------------------------*/
static void
gpio_int_cb(PIN_Handle handle, PIN_Id pin_id)
{
  /* Unused args */
  (void)handle;

  gpio_hal_event_handler(gpio_hal_pin_to_mask(pin_id));
}

/*---------------------------------------------------------------------------*/
void
gpio_hal_arch_init(void)
{
  /* No error checking */
  pin_handle = PIN_open(&pin_state, pin_config);
  PIN_registerIntCb(pin_handle, gpio_int_cb);
}
/*---------------------------------------------------------------------------*/
void
gpio_hal_arch_interrupt_enable(gpio_hal_pin_t pin, gpio_hal_pin_cfg_t cfg)
{
  PIN_add(pin_handle, PIN_getConfig(pin));

  cfg &= GPIO_HAL_PIN_BM_INT;

  PIN_Config int_cfg = PIN_IRQ_DIS;
  switch (cfg) {
  case GPIO_HAL_PIN_CFG_INT_FALLING: int_cfg |= PIN_IRQ_NEGEDGE;   break;
  case GPIO_HAL_PIN_CFG_INT_RISING:  int_cfg |= PIN_IRQ_POSEDGE;   break;
  case GPIO_HAL_PIN_CFG_INT_BOTH:    int_cfg |= PIN_IRQ_BOTHEDGES; break;
  }

  PIN_setInterrupt(pin_handle, pin | int_cfg);
}
/*---------------------------------------------------------------------------*/
void
gpio_hal_arch_interrupt_disable(gpio_hal_pin_t pin)
{
  PIN_add(pin_handle, PIN_getConfig(pin));

  PIN_setInterrupt(pin_handle, pin | PIN_IRQ_DIS);
}
/*---------------------------------------------------------------------------*/
void
gpio_hal_arch_pin_cfg_set(gpio_hal_pin_t pin, gpio_hal_pin_cfg_t cfg)
{
  PIN_add(pin_handle, PIN_getConfig(pin));

  /* Clear settings that we are about to change, keep everything else */
  PIN_Config pin_cfg = 0;
  PIN_Config pin_mask = 0;

  from_hal_cfg(cfg, &pin_cfg, &pin_mask);

  PIN_setConfig(pin_handle, pin_mask, pin | pin_cfg);
}
/*---------------------------------------------------------------------------*/
gpio_hal_pin_cfg_t
gpio_hal_arch_pin_cfg_get(gpio_hal_pin_t pin)
{
  PIN_Config pin_cfg = PIN_getConfig(pin);
  gpio_hal_pin_cfg_t cfg = 0;

  to_hal_cfg(pin_cfg, &cfg);

  return cfg;
}
/*---------------------------------------------------------------------------*/
gpio_hal_pin_mask_t
gpio_hal_arch_read_pins(gpio_hal_pin_mask_t pins)
{
  /* For pins configured as output we need to read DOUT31_0 */
  gpio_hal_pin_mask_t oe_pins = GPIO_getOutputEnableMultiDio(pins);

  pins &= ~oe_pins;

  return (HWREG(GPIO_BASE + GPIO_O_DOUT31_0) & oe_pins) |
          GPIO_readMultiDio(pins);
}
/*---------------------------------------------------------------------------*/
uint8_t
gpio_hal_arch_read_pin(gpio_hal_pin_t pin)
{
  return (GPIO_getOutputEnableDio(pin))
    ? PINCC26XX_getOutputValue(pin)
    : PINCC26XX_getInputValue(pin);
}
/*---------------------------------------------------------------------------*/
/** @} */