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/*
* linux/drivers/power/fg/fg_ocv.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/time.h>
#include <linux/device.h>
#include <linux/power/ti-fg.h>
#include "fg_ocv.h"
#include "fg_math.h"
/* OCV Lookup table */
#define INTERPOLATE_MAX 1000
unsigned short interpolate(unsigned short value,
unsigned short *table,
unsigned char size)
{
unsigned char i;
unsigned short d;
for (i = 0; i < size; i++)
if (value < table[i])
break;
if ((i > 0) && (i < size)) {
d = (value - table[i-1]) * (INTERPOLATE_MAX/(size-1));
d /= table[i] - table[i-1];
d = d + (i-1) * (INTERPOLATE_MAX/(size-1));
} else {
d = i * DIV_ROUND_CLOSEST(INTERPOLATE_MAX, size);
}
if (d > 1000)
d = 1000;
return d;
}
/*
* Open Circuit Voltage (OCV) correction routine. This function estimates SOC,
* based on the voltage.
*/
void fg_ocv(struct cell_state *cell)
{
int tmp;
dev_dbg(cell->dev, "FG: OCV Correction\n");
/* Reset EL counter */
cell->electronics_load = 0;
cell->cumulative_sleep = 0;
tmp = interpolate(cell->av_voltage, cell->config->ocv->table,
OCV_TABLE_SIZE);
cell->soc = DIV_ROUND_CLOSEST(tmp * MAX_PERCENTAGE, INTERPOLATE_MAX);
cell->nac = DIV_ROUND_CLOSEST(tmp * cell->fcc, INTERPOLATE_MAX);
if (!cell->ocv && cell->init) {
cell->ocv = true;
cell->ocv_enter_q = cell->nac;
dev_dbg(cell->dev, "LRN: Entering OCV, OCVEnterQ = %dmAh\n",
cell->ocv_enter_q);
}
do_gettimeofday(&cell->last_ocv);
}
/* Check if the cell is in Sleep */
bool fg_check_relaxed(struct cell_state *cell)
{
struct timeval now;
do_gettimeofday(&now);
if (!cell->sleep) {
if (abs(cell->cur) <=
cell->config->ocv->sleep_enter_current) {
if (cell->sleep_samples < MAX_UINT8)
cell->sleep_samples++;
if (cell->sleep_samples >=
cell->config->ocv->sleep_enter_samples) {
/* Entering sleep mode */
cell->sleep_timer.tv_sec = now.tv_sec;
cell->el_timer.tv_sec = now.tv_sec;
cell->sleep = true;
dev_dbg(cell->dev, "Sleeping\n");
cell->calibrate = true;
}
} else {
cell->sleep_samples = 0;
}
} else {
/* The battery cell is Sleeping, checking if need to exit
sleep mode count number of seconds that cell spent in
sleep */
cell->cumulative_sleep += now.tv_sec - cell->el_timer.tv_sec;
cell->el_timer.tv_sec = now.tv_sec;
/* Check if we need to reset Sleep */
if (abs(cell->av_current) >
cell->config->ocv->sleep_exit_current) {
if (abs(cell->cur) >
cell->config->ocv->sleep_exit_current) {
if (cell->sleep_samples < MAX_UINT8)
cell->sleep_samples++;
} else {
cell->sleep_samples = 0;
}
/* Check if we need to reset a Sleep timer */
if (cell->sleep_samples >
cell->config->ocv->sleep_exit_samples) {
/* Exit sleep mode */
cell->sleep_timer.tv_sec = 0;
cell->sleep = false;
cell->relax = false;
dev_dbg(cell->dev,
"Not relaxed and not sleeping\n");
}
} else {
cell->sleep_samples = 0;
if (!cell->relax) {
if (now.tv_sec-cell->sleep_timer.tv_sec >
cell->config->ocv->relax_period) {
cell->relax = true;
dev_dbg(cell->dev, "Relaxed\n");
cell->calibrate = true;
}
}
}
}
return cell->relax;
}
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