/*
 * In this module we are going to implement the main process functions
 * for FCHG.
 */

#include "fchg/fchg_env.h"
#include "fchg/fchg_func_i.h"
#include "rv/rv_general.h"
#include "rvf/rvf_api.h"
#include "rvm/rvm_use_id_list.h"
#include "abb/abb.h"
#include <string.h>
#include <stdio.h>

extern UINT16 madc_vbat_2_physical(UINT16 adc_val);

void pwr_init_discharge(void)
{
	pwr_ctrl->curr_disch_thresh = 0;
}

static void handle_discharge(void)
{
	UINT16 i;
	char trace[64];

	/* first we need to find the current threshold we are at */
	i = pwr_ctrl->curr_disch_thresh;
	/* is there one below? */
	if (++i == pwr_ctrl->nb_thresholds)
		return;
	/* are we crossing it? */
	if (pwr_ctrl->batt_mv >= pwr_ctrl->batt_thresholds[i].bat_voltage)
		return;
	/* yes, we crossed it - see if we fell even further down */
	while (i < pwr_ctrl->nb_thresholds &&
	       pwr_ctrl->batt_mv < pwr_ctrl->batt_thresholds[i].bat_voltage)
		i++;
	/* the last one was it */
	i--;
	pwr_ctrl->curr_disch_thresh = i;
	sprintf(trace, "Battery fell through %u%% mark",
		pwr_ctrl->batt_thresholds[i].remain_capa);
	rvf_send_trace(trace, strlen(trace), NULL_PARAM,
			RV_TRACE_LEVEL_WARNING, FCHG_USE_ID);
}

static void charge_progress_trace(char *mode, UINT16 ichg)
{
	char trace[64];

	sprintf(trace, "%s charging: Vbat=%u Ichg=%u i2v=%u", mode,
		pwr_ctrl->batt_mv, ichg, pwr_ctrl->i2v_offset);
	rvf_send_trace(trace, strlen(trace), NULL_PARAM,
			RV_TRACE_LEVEL_DEBUG_LOW, FCHG_USE_ID);
}

static void start_i2v_cal(void)
{
	UINT16 bciconf;

	rvf_send_trace("Calibrating i2v offset", 22, NULL_PARAM,
			RV_TRACE_LEVEL_DEBUG_HIGH, FCHG_USE_ID);
	pwr_ctrl->state = FCHG_STATE_I2V_CAL_2;
	bciconf = ABB_Read_Register_on_page(PAGE1, BCICONF);
	bciconf &= 0x3E0;
	bciconf |= pwr_ctrl->config.bciconf;
	ABB_Write_Register_on_page(PAGE1, BCICONF, bciconf);
	/*
	 * Set the CHDISPA bit and start the zero calibration routine
	 * of the I to V converter
	 */
	ABB_Write_Register_on_page(PAGE0, BCICTL2, 0x0010);
	ABB_Write_Register_on_page(PAGE0, BCICTL2, 0x0019);
}

static void start_ci_charging(void)
{
	rvf_send_trace("Start CI charging", 17, NULL_PARAM,
			RV_TRACE_LEVEL_DEBUG_HIGH, FCHG_USE_ID);
	pwr_ctrl->state = FCHG_STATE_CI_CHARGING;
	/* Select constant current charging. The charger is disabled */
	ABB_Write_Register_on_page(PAGE0, BCICTL2, 0x0002);
	/* Program the DAC with the constant current value */
	ABB_Write_Register_on_page(PAGE0, CHGREG,
			pwr_ctrl->config.ci_current + pwr_ctrl->i2v_offset);
	/* Enable the charger */
	ABB_Write_Register_on_page(PAGE0, BCICTL2, 0x0003);
}

static void start_cv_charging(UINT16 code)
{
	rvf_send_trace("Start CV charging", 17, NULL_PARAM,
			RV_TRACE_LEVEL_DEBUG_HIGH, FCHG_USE_ID);
	pwr_ctrl->state = FCHG_STATE_CV_CHARGING;
	/* Select constant voltage charging. The charger is disabled */
	ABB_Write_Register_on_page(PAGE0, BCICTL2, 0);
	/* figure out the DAC code */
	while (code &&
	       madc_vbat_2_physical(code) >= pwr_ctrl->config.charge_to_mv)
		code--;
	code++;
	rvf_send_trace("Voltage (DAC code) ", 19, code,
			RV_TRACE_LEVEL_DEBUG_LOW, FCHG_USE_ID);
	/* Program the DAC with the constant voltage value */
	ABB_Write_Register_on_page(PAGE0, CHGREG, code);
	/* Enable the charger */
	ABB_Write_Register_on_page(PAGE0, BCICTL2, 0x0001);
}

static void start_charge_condition_met(void)
{
	rvf_send_trace("Charge start condition met", 26, NULL_PARAM,
			RV_TRACE_LEVEL_DEBUG_HIGH, FCHG_USE_ID);
	if (pwr_ctrl->config.bciconf)
		start_i2v_cal();
	else {
		pwr_ctrl->i2v_offset = 0;
		start_ci_charging();
	}
}

static int overvoltage_end_charge_check(void)
{
	if (pwr_ctrl->batt_mv < pwr_ctrl->config.overvoltage)
		return 0;
	rvf_send_trace("Stopping charge by overvoltage condition", 40,
			NULL_PARAM, RV_TRACE_LEVEL_DEBUG_HIGH, FCHG_USE_ID);
	ABB_Write_Register_on_page(PAGE0, BCICTL2, 0);
	pwr_init_discharge();
	pwr_ctrl->state = FCHG_STATE_READY_TO_RECHARGE;
	return 1;
}

void pwr_process_adc(struct pwr_adc_ind_s *msg)
{
	pwr_ctrl->batt_mv = madc_vbat_2_physical(msg->data[0]);

	switch (pwr_ctrl->state) {
	case FCHG_STATE_NO_EXT_PWR:
	case FCHG_STATE_PWR_PLUG_TIMER:
	case FCHG_STATE_NO_CHARGING:
		handle_discharge();
		return;
	case FCHG_STATE_READY_TO_CHARGE:
		handle_discharge();
		if (!(msg->data[9] & CHGPRES)) {
			pwr_ctrl->state = FCHG_STATE_NO_EXT_PWR;
			return;
		}
		if (pwr_ctrl->batt_mv >= pwr_ctrl->config.start_thresh)
			start_charge_condition_met();
		return;
	case FCHG_STATE_READY_TO_RECHARGE:
		handle_discharge();
		if (!(msg->data[9] & CHGPRES)) {
			pwr_ctrl->state = FCHG_STATE_NO_EXT_PWR;
			return;
		}
		if (pwr_ctrl->batt_mv >= pwr_ctrl->config.restart_thresh)
			start_charge_condition_met();
		return;
	case FCHG_STATE_I2V_CAL_1:
		if (!(msg->data[9] & CHGPRES)) {
			pwr_ctrl->state = FCHG_STATE_NO_EXT_PWR;
			return;
		}
		if (pwr_ctrl->config.bciconf)
			start_i2v_cal();
		else {
			pwr_ctrl->i2v_offset = 0;
			start_ci_charging();
		}
		return;
	case FCHG_STATE_I2V_CAL_2:
		pwr_ctrl->i2v_offset = msg->data[2];
		ABB_Write_Register_on_page(PAGE0, BCICTL2, 0);
		rvf_send_trace("i2v offset (MADC code) ", 23,
				pwr_ctrl->i2v_offset,
				RV_TRACE_LEVEL_DEBUG_LOW, FCHG_USE_ID);
		if (!(msg->data[9] & CHGPRES)) {
			pwr_ctrl->state = FCHG_STATE_NO_EXT_PWR;
			return;
		}
		start_ci_charging();
		return;
	case FCHG_STATE_CI_CHARGING:
		charge_progress_trace("CI", msg->data[2]);
		if (!(msg->data[9] & CHGPRES)) {
			ABB_Write_Register_on_page(PAGE0, BCICTL2, 0);
			pwr_ctrl->state = FCHG_STATE_NO_EXT_PWR;
			return;
		}
		if (overvoltage_end_charge_check())
			return;
		if (pwr_ctrl->batt_mv >= pwr_ctrl->config.charge_to_mv)
			start_cv_charging(msg->data[0]);
		return;
	case FCHG_STATE_CV_CHARGING:
		charge_progress_trace("CV", msg->data[2]);
		if (!(msg->data[9] & CHGPRES)) {
			ABB_Write_Register_on_page(PAGE0, BCICTL2, 0);
			pwr_ctrl->state = FCHG_STATE_NO_EXT_PWR;
			return;
		}
		if (overvoltage_end_charge_check())
			return;
		if (msg->data[2] >=
		    pwr_ctrl->config.end_current + pwr_ctrl->i2v_offset)
			return;
		rvf_send_trace("Stopping charge by low current condition", 40,
				NULL_PARAM, RV_TRACE_LEVEL_DEBUG_HIGH,
				FCHG_USE_ID);
		ABB_Write_Register_on_page(PAGE0, BCICTL2, 0);
		pwr_init_discharge();
		pwr_ctrl->state = FCHG_STATE_READY_TO_RECHARGE;
		return;
	default:
		rvf_send_trace("Invalid state in pwr_process_adc()", 32,
				pwr_ctrl->state, RV_TRACE_LEVEL_ERROR,
				FCHG_USE_ID);
	}
}

void pwr_handle_timer(void)
{
	if (pwr_ctrl->state != FCHG_STATE_PWR_PLUG_TIMER)
		return;
	rvf_send_trace("Timer expired, ready to charge", 30, NULL_PARAM,
			RV_TRACE_LEVEL_DEBUG_LOW, FCHG_USE_ID);
	pwr_ctrl->state = FCHG_STATE_READY_TO_CHARGE;
}

void pwr_charger_plug(void)
{
	if (pwr_ctrl->state != FCHG_STATE_NO_EXT_PWR) {
		rvf_send_trace("Charger plug event in unexpected state", 38,
				pwr_ctrl->state, RV_TRACE_LEVEL_ERROR,
				FCHG_USE_ID);
		return;
	}
	if (!pwr_ctrl->config_present) {
		rvf_send_trace(
			"Charger plugged in, but no config: won't charge", 47,
			NULL_PARAM, RV_TRACE_LEVEL_ERROR, FCHG_USE_ID);
		pwr_ctrl->state = FCHG_STATE_NO_CHARGING;
		return;
	}
	if (pwr_ctrl->config.start_delay) {
		rvf_send_trace("Charger plug, starting timer", 28, NULL_PARAM,
				RV_TRACE_LEVEL_DEBUG_HIGH, FCHG_USE_ID);
		rvf_start_timer(FCHG_TIMER,
				RVF_MS_TO_TICKS(pwr_ctrl->config.start_delay),
				FALSE);
		pwr_ctrl->state = FCHG_STATE_PWR_PLUG_TIMER;
	} else {
		rvf_send_trace("Charger plug, ready to charge", 29, NULL_PARAM,
				RV_TRACE_LEVEL_DEBUG_HIGH, FCHG_USE_ID);
		pwr_ctrl->state = FCHG_STATE_READY_TO_CHARGE;
	}
}

void pwr_charger_unplug(void)
{
	switch (pwr_ctrl->state) {
	case FCHG_STATE_NO_EXT_PWR:
		rvf_send_trace("Charger unplug, already handled", 31,
				NULL_PARAM, RV_TRACE_LEVEL_DEBUG_LOW,
				FCHG_USE_ID);
		/* nothing to do */
		return;
	case FCHG_STATE_PWR_PLUG_TIMER:
	case FCHG_STATE_READY_TO_CHARGE:
	case FCHG_STATE_READY_TO_RECHARGE:
	case FCHG_STATE_I2V_CAL_1:
	case FCHG_STATE_NO_CHARGING:
		rvf_send_trace("Charger unplug", 14, NULL_PARAM,
				RV_TRACE_LEVEL_DEBUG_LOW, FCHG_USE_ID);
		pwr_ctrl->state = FCHG_STATE_NO_EXT_PWR;
		return;
	case FCHG_STATE_I2V_CAL_2:
	case FCHG_STATE_CI_CHARGING:
	case FCHG_STATE_CV_CHARGING:
		ABB_Write_Register_on_page(PAGE0, BCICTL2, 0);
		rvf_send_trace("Charger unplug, charging stopped", 32,
				NULL_PARAM, RV_TRACE_LEVEL_DEBUG_HIGH,
				FCHG_USE_ID);
		pwr_ctrl->state = FCHG_STATE_NO_EXT_PWR;
		pwr_init_discharge();
		return;
	default:
		rvf_send_trace("Invalid state in pwr_charger_unplug()", 35,
				pwr_ctrl->state, RV_TRACE_LEVEL_ERROR,
				FCHG_USE_ID);
	}
}