/*   ==================================================================

     >>>>>>>>>>>>>>>>>>>>>>> COPYRIGHT NOTICE <<<<<<<<<<<<<<<<<<<<<<<<<
     ------------------------------------------------------------------
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     ------------------------------------------------------------------

       IMPORTANT: THIS FILE IS USED BY OR GENERATED BY the LATTICE PROPEL™
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     ================================================================== */

#include "i2c_monitor.h"
#include <stddef.h>

unsigned char i2c_mon_init(struct i2c_mon_instance *this_i2cmon,
			   unsigned int base_addr)
{
	volatile struct i2c_mon_dev *dev;
	if (NULL == this_i2cmon) {
		return 1;
	}
	this_i2cmon->base_addr = base_addr;
	this_i2cmon->num_entry = 0;
	this_i2cmon->event_det_cnt = 0;
	this_i2cmon->int_en = 0;
	this_i2cmon->evt_entry_num = 0;

	return 0;
}

unsigned char i2c_mon_conf(struct i2c_mon_instance *this_i2cmon,
			   struct i2c_mon_entry *entry_data,
			   unsigned int entry_num)
{
	volatile struct i2c_mon_entry *dev_entry;
	if (NULL == this_i2cmon) {
		return 1;
	}
	dev_entry = (struct i2c_mon_entry *) this_i2cmon->base_addr;

	if (entry_num <= this_i2cmon->num_entry) {
		for (int i = 0; i < entry_num; i++) {
			*dev_entry++ = *entry_data++;
		}
	} else {
		return 1;
	}
	return 0;
}

// disable/enable for each entry
unsigned char i2c_mon_enable(struct i2c_mon_instance *this_i2cmon,
			     unsigned int mon_en)
{
	if (NULL == this_i2cmon) {
		return 1;
	}
	volatile struct i2c_mon_dev *dev =
	    (struct i2c_mon_dev *) (this_i2cmon->base_addr +
				    I2C_MON_DEV_OFFSET);

	if (mon_en) {
		dev->i2cbf_cr |= I2CBF_DET_EN;
	} else {
		dev->i2cbf_cr &= (~I2CBF_DET_EN);
	}

	return 0;
}

unsigned char i2c_mon_bus_stop(struct i2c_mon_instance *this_i2cmon,
			       unsigned char bus_stop)
{
	if (NULL == this_i2cmon) {
		return 1;
	}
	volatile struct i2c_mon_dev *dev =
	    (struct i2c_mon_dev *) (this_i2cmon->base_addr +
				    I2C_MON_DEV_OFFSET);

	if (bus_stop) {
		// stop the bus
		dev->i2cbf_cr |= I2CBF_BUS_STOP;
	} else {
		// release the bus
		dev->i2cbf_cr &= (~I2CBF_BUS_STOP);
	}

	return 0;
}

unsigned char i2c_mon_status_get(struct i2c_mon_instance *this_i2cmon,
				 unsigned char *event_cnt,
				 unsigned int *dct_evt)
{
	if (NULL == this_i2cmon) {
		return 1;
	}
	volatile struct i2c_mon_dev *dev =
	    (struct i2c_mon_dev *) (this_i2cmon->base_addr +
				    I2C_MON_DEV_OFFSET);

	// disable int to avoid confliction
	dev->i2cbf_intenr &= (~I2CBF_INT_EN);
	*event_cnt = this_i2cmon->event_det_cnt;
	*dct_evt = this_i2cmon->evt_entry_num;

	this_i2cmon->evt_entry_num = 0;
	this_i2cmon->event_det_cnt = 0;

	// enable the int
	dev->i2cbf_intenr |= I2CBF_INT_EN;

	return 0;
}

void i2c_mon_isr(unsigned int intr_level, void *ctx)
{
	unsigned char status = 0;
	struct i2c_mon_instance *this_i2cmon =
	    (struct i2c_mon_instance *) ctx;
	volatile struct i2c_mon_dev *dev =
	    (struct i2c_mon_dev *) (this_i2cmon->base_addr +
				    I2C_MON_DEV_OFFSET);

	// read back the current detected event
	status = dev->i2cbf_sr;

	if (status & I2CBF_ENT_DET) {
		this_i2cmon->event_det_cnt += 1;
		this_i2cmon->evt_entry_num =
		    (1 << (status & I2CBF_ENT_NUM_MASK));

		// clear the interrupt
		dev->i2cbf_intsetr = I2CBF_INT_EN;
	}

	return;
}