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/*
* linux/drivers/power/fg/fg_edv.c
*
* TI Fuel Gauge driver for Linux
*
* Copyright (C) 2008-2009 Texas Instruments, Inc.
* Author: Texas Instruments, Inc.
*
* This package is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/power/ti-fg.h>
#include "fg_math.h"
#include "fg_edv.h"
/* Current that that is used for the EDV */
#define EDV_CURRENT (cell->config->edv->averaging ? \
cell->av_current : \
cell->cur)
/* Voltage that that is used for the EDV */
#define EDV_VOLTAGE (cell->config->edv->averaging ? \
cell->av_voltage : \
cell->voltage)
/* Init EDV point */
void fg_init_edv(struct cell_state *cell, struct edv_point *edv)
{
if ((cell->edv.percent == edv->percent) && cell->init)
return;
cell->edv.voltage = edv->voltage;
cell->edv.percent = edv->percent;
cell->edv.min_capacity = DIV_ROUND_CLOSEST(cell->fcc * edv->percent,
MAX_PERCENTAGE);
}
/*
* Updates EDV0, EDV1, EDV2 falgs according to SOC. Except when EDV is
* working
*/
void fg_update_edv_flags(struct cell_state *cell)
{
unsigned char soc;
soc = DIV_ROUND_CLOSEST(cell->nac * MAX_PERCENTAGE, cell->fcc);
if (soc > cell->config->edv->edv[2].percent) {
cell->edv2 = false;
cell->edv1 = false;
cell->edv0 = false;
fg_init_edv(cell, &cell->config->edv->edv[2]);
} else if (((soc < cell->config->edv->edv[2].percent) || !cell->init)
&& (soc > cell->config->edv->edv[1].percent)) {
/* If soc == EDV2 at init, start looking for EDV1 */
cell->edv2 = true;
cell->edv1 = false;
cell->edv0 = false;
cell->vdq = false;
fg_init_edv(cell, &cell->config->edv->edv[1]);
} else if ((soc < cell->config->edv->edv[1].percent) || !cell->init) {
/* If soc == EDV1 at init, start looking for EDV0 */
cell->edv2 = true;
cell->edv1 = true;
cell->vdq = false;
if (soc > cell->config->edv->edv[0].percent)
cell->edv0 = false;
if (cell->edv.percent != cell->config->edv->edv[0].percent)
fg_init_edv(cell, &cell->config->edv->edv[0]);
}
}
/* Test EDV point, against current discharge settings and conditions */
short fg_test_edv(struct cell_state *cell)
{
bool bad_load = 0;
/* Checking if Current is Bad (Too Low, ot Too High) */
bad_load |= -cell->cur < (short) cell->config->light_load;
bad_load |= -cell->cur > cell->config->edv->overload_current;
/* Checking if capacity droped below EDV%, restoring if so */
if (cell->nac < cell->edv.min_capacity) {
dev_dbg(cell->dev, "NAC(%d) < EDV Capacity(%d)\n",
cell->nac, cell->edv.min_capacity);
if (bad_load && cell->vdq) {
cell->vdq = false;
dev_dbg(cell->dev,
"LRN: Current out of qualification range"
"Disqual. %d < Cur < %d\n",
cell->config->light_load,
cell->config->edv->overload_current);
}
cell->nac = cell->edv.min_capacity;
}
/* If Voltage is under EDV Voltage, reporting EDV */
if (EDV_VOLTAGE <= cell->edv.voltage) {
dev_dbg(cell->dev, "Voltage %dmV <= EDV %dmV\n",
EDV_VOLTAGE, cell->edv.voltage);
/* If VDQ, checking if it needs to be cleared */
if (bad_load && cell->vdq) {
cell->vdq = false;
dev_dbg(cell->dev,
"LRN: Current out of qualification range"
"Disqual. %d < Cur < %d\n",
cell->config->light_load,
cell->config->edv->overload_current);
}
return true;
}
return false;
}
/*
* EDV targeting routine, that tests EDV point and Adjusts a capacity, based
* on the Voltage and NAC
*/
bool fg_look_for_edv(struct cell_state *cell)
{
if (fg_test_edv(cell)) {
cell->seq_edvs++;
dev_dbg(cell->dev, "EDV: EDV detected #%d\n", cell->seq_edvs);
} else {
cell->seq_edvs = 0;
}
if (cell->seq_edvs > cell->config->edv->seq_edv) {
/* EDV point is reached */
cell->seq_edvs = 0;
dev_dbg(cell->dev, "EDV: EDV reached (%dmV, %dmAh)\n",
EDV_VOLTAGE, cell->edv.min_capacity);
/* Let's check whether discharge cycle is still useable
for learning */
if ((short) cell->voltage <
(short) (cell->edv.voltage -
cell->config->deep_dsg_voltage)) {
dev_dbg(cell->dev, "Learning Cycle isn't qualified\n");
cell->vdq = false;
}
/* Set capacity to the EDV% Level */
if (cell->nac > cell->edv.min_capacity)
cell->nac = cell->edv.min_capacity;
return 1;
}
return 0;
}
/*
* EDV algorithm, should be called on discharge, adjusts NAC, based
* on the discharge conditions. Also set EDV2, 1, 0 flags if needed
*/
void fg_edv(struct cell_state *cell)
{
/* Check if EDV condition reached and we are above EDV0*/
if (!cell->edv0 && fg_look_for_edv(cell)) {
/* EDV2 point reached */
if (!cell->edv2) {
/* todo : recalibrate? */
cell->edv2 = true;
if (cell->vdq) {
dev_dbg(cell->dev, "LRN: Learned Capacity ="
" %d + %d + %d + %d mAh\n",
-cell->learn_q,
cell->ocv_total_q,
cell->learn_offset,
cell->nac);
fg_learn_capacity(cell,
-cell->learn_q +
cell->ocv_total_q +
cell->learn_offset +
cell->nac);
}
cell->vdq = false;
fg_init_edv(cell, &cell->config->edv->edv[1]);
} else if (!cell->edv1) {
/* EDV1 point reached */
cell->edv1 = true;
fg_init_edv(cell, &cell->config->edv->edv[0]);
} else {
/* EDV0 point reached */
cell->edv0 = true;
}
}
}
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