339 lines
7.9 KiB
C
339 lines
7.9 KiB
C
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/module.h>
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#include <linux/mfd/pm8xxx/batterydata-lib.h>
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int linear_interpolate(int y0, int x0, int y1, int x1, int x)
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{
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if (y0 == y1 || x == x0)
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return y0;
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if (x1 == x0 || x == x1)
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return y1;
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return y0 + ((y1 - y0) * (x - x0) / (x1 - x0));
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}
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int is_between(int left, int right, int value)
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{
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if (left >= right && left >= value && value >= right)
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return 1;
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if (left <= right && left <= value && value <= right)
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return 1;
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return 0;
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}
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static int interpolate_single_lut(struct single_row_lut *lut, int x)
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{
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int i, result;
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if (x < lut->x[0]) {
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pr_debug("x %d less than known range return y = %d lut = %pS\n",
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x, lut->y[0], lut);
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return lut->y[0];
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}
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if (x > lut->x[lut->cols - 1]) {
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pr_debug("x %d more than known range return y = %d lut = %pS\n",
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x, lut->y[lut->cols - 1], lut);
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return lut->y[lut->cols - 1];
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}
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for (i = 0; i < lut->cols; i++)
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if (x <= lut->x[i])
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break;
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if (x == lut->x[i]) {
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result = lut->y[i];
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} else {
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result = linear_interpolate(
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lut->y[i - 1],
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lut->x[i - 1],
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lut->y[i],
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lut->x[i],
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x);
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}
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return result;
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}
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int interpolate_fcc(struct single_row_lut *fcc_temp_lut, int batt_temp)
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{
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/* batt_temp is in tenths of degC - convert it to degC for lookups */
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batt_temp = batt_temp/10;
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return interpolate_single_lut(fcc_temp_lut, batt_temp);
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}
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int interpolate_scalingfactor_fcc(struct single_row_lut *fcc_sf_lut,
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int cycles)
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{
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/*
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* sf table could be null when no battery aging data is available, in
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* that case return 100%
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*/
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if (fcc_sf_lut)
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return interpolate_single_lut(fcc_sf_lut, cycles);
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else
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return 100;
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}
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int interpolate_scalingfactor(struct sf_lut *sf_lut, int row_entry, int pc)
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{
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int i, scalefactorrow1, scalefactorrow2, scalefactor, rows, cols;
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int row1 = 0;
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int row2 = 0;
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/*
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* sf table could be null when no battery aging data is available, in
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* that case return 100%
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*/
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if (!sf_lut)
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return 100;
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rows = sf_lut->rows;
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cols = sf_lut->cols;
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if (pc > sf_lut->percent[0]) {
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pr_debug("pc %d greater than known pc ranges for sfd\n", pc);
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row1 = 0;
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row2 = 0;
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}
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if (pc < sf_lut->percent[rows - 1]) {
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pr_debug("pc %d less than known pc ranges for sf\n", pc);
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row1 = rows - 1;
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row2 = rows - 1;
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}
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for (i = 0; i < rows; i++) {
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if (pc == sf_lut->percent[i]) {
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row1 = i;
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row2 = i;
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break;
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}
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if (pc > sf_lut->percent[i]) {
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row1 = i - 1;
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row2 = i;
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break;
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}
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}
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if (row_entry < sf_lut->row_entries[0])
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row_entry = sf_lut->row_entries[0];
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if (row_entry > sf_lut->row_entries[cols - 1])
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row_entry = sf_lut->row_entries[cols - 1];
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for (i = 0; i < cols; i++)
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if (row_entry <= sf_lut->row_entries[i])
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break;
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if (row_entry == sf_lut->row_entries[i]) {
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scalefactor = linear_interpolate(
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sf_lut->sf[row1][i],
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sf_lut->percent[row1],
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sf_lut->sf[row2][i],
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sf_lut->percent[row2],
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pc);
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return scalefactor;
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}
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scalefactorrow1 = linear_interpolate(
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sf_lut->sf[row1][i - 1],
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sf_lut->row_entries[i - 1],
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sf_lut->sf[row1][i],
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sf_lut->row_entries[i],
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row_entry);
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scalefactorrow2 = linear_interpolate(
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sf_lut->sf[row2][i - 1],
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sf_lut->row_entries[i - 1],
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sf_lut->sf[row2][i],
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sf_lut->row_entries[i],
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row_entry);
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scalefactor = linear_interpolate(
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scalefactorrow1,
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sf_lut->percent[row1],
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scalefactorrow2,
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sf_lut->percent[row2],
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pc);
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return scalefactor;
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}
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/* get ocv given a soc -- reverse lookup */
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int interpolate_ocv(struct pc_temp_ocv_lut *pc_temp_ocv,
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int batt_temp_degc, int pc)
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{
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int i, ocvrow1, ocvrow2, ocv, rows, cols;
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int row1 = 0;
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int row2 = 0;
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rows = pc_temp_ocv->rows;
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cols = pc_temp_ocv->cols;
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if (pc > pc_temp_ocv->percent[0]) {
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pr_debug("pc %d greater than known pc ranges for sfd\n", pc);
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row1 = 0;
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row2 = 0;
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}
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if (pc < pc_temp_ocv->percent[rows - 1]) {
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pr_debug("pc %d less than known pc ranges for sf\n", pc);
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row1 = rows - 1;
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row2 = rows - 1;
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}
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for (i = 0; i < rows; i++) {
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if (pc == pc_temp_ocv->percent[i]) {
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row1 = i;
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row2 = i;
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break;
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}
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if (pc > pc_temp_ocv->percent[i]) {
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row1 = i - 1;
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row2 = i;
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break;
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}
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}
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if (batt_temp_degc < pc_temp_ocv->temp[0])
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batt_temp_degc = pc_temp_ocv->temp[0];
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if (batt_temp_degc > pc_temp_ocv->temp[cols - 1])
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batt_temp_degc = pc_temp_ocv->temp[cols - 1];
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for (i = 0; i < cols; i++)
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if (batt_temp_degc <= pc_temp_ocv->temp[i])
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break;
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if (batt_temp_degc == pc_temp_ocv->temp[i]) {
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ocv = linear_interpolate(
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pc_temp_ocv->ocv[row1][i],
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pc_temp_ocv->percent[row1],
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pc_temp_ocv->ocv[row2][i],
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pc_temp_ocv->percent[row2],
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pc);
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return ocv;
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}
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ocvrow1 = linear_interpolate(
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pc_temp_ocv->ocv[row1][i - 1],
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pc_temp_ocv->temp[i - 1],
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pc_temp_ocv->ocv[row1][i],
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pc_temp_ocv->temp[i],
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batt_temp_degc);
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ocvrow2 = linear_interpolate(
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pc_temp_ocv->ocv[row2][i - 1],
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pc_temp_ocv->temp[i - 1],
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pc_temp_ocv->ocv[row2][i],
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pc_temp_ocv->temp[i],
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batt_temp_degc);
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ocv = linear_interpolate(
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ocvrow1,
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pc_temp_ocv->percent[row1],
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ocvrow2,
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pc_temp_ocv->percent[row2],
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pc);
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return ocv;
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}
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int interpolate_pc(struct pc_temp_ocv_lut *pc_temp_ocv,
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int batt_temp_degc, int ocv)
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{
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int i, j, pcj, pcj_minus_one, pc;
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int rows = pc_temp_ocv->rows;
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int cols = pc_temp_ocv->cols;
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if (batt_temp_degc < pc_temp_ocv->temp[0]) {
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pr_debug("batt_temp %d < known temp range\n", batt_temp_degc);
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batt_temp_degc = pc_temp_ocv->temp[0];
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}
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if (batt_temp_degc > pc_temp_ocv->temp[cols - 1]) {
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pr_debug("batt_temp %d > known temp range\n", batt_temp_degc);
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batt_temp_degc = pc_temp_ocv->temp[cols - 1];
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}
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for (j = 0; j < cols; j++)
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if (batt_temp_degc <= pc_temp_ocv->temp[j])
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break;
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if (batt_temp_degc == pc_temp_ocv->temp[j]) {
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/* found an exact match for temp in the table */
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if (ocv >= pc_temp_ocv->ocv[0][j])
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return pc_temp_ocv->percent[0];
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if (ocv <= pc_temp_ocv->ocv[rows - 1][j])
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return pc_temp_ocv->percent[rows - 1];
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for (i = 0; i < rows; i++) {
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if (ocv >= pc_temp_ocv->ocv[i][j]) {
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if (ocv == pc_temp_ocv->ocv[i][j])
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return pc_temp_ocv->percent[i];
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pc = linear_interpolate(
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pc_temp_ocv->percent[i],
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pc_temp_ocv->ocv[i][j],
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pc_temp_ocv->percent[i - 1],
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pc_temp_ocv->ocv[i - 1][j],
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ocv);
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return pc;
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}
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}
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}
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/*
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* batt_temp_degc is within temperature for
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* column j-1 and j
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*/
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if (ocv >= pc_temp_ocv->ocv[0][j])
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return pc_temp_ocv->percent[0];
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if (ocv <= pc_temp_ocv->ocv[rows - 1][j - 1])
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return pc_temp_ocv->percent[rows - 1];
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pcj_minus_one = 0;
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pcj = 0;
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for (i = 0; i < rows-1; i++) {
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if (pcj == 0
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&& is_between(pc_temp_ocv->ocv[i][j],
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pc_temp_ocv->ocv[i+1][j], ocv)) {
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pcj = linear_interpolate(
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pc_temp_ocv->percent[i],
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pc_temp_ocv->ocv[i][j],
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pc_temp_ocv->percent[i + 1],
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pc_temp_ocv->ocv[i+1][j],
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ocv);
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}
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if (pcj_minus_one == 0
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&& is_between(pc_temp_ocv->ocv[i][j-1],
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pc_temp_ocv->ocv[i+1][j-1], ocv)) {
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pcj_minus_one = linear_interpolate(
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pc_temp_ocv->percent[i],
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pc_temp_ocv->ocv[i][j-1],
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pc_temp_ocv->percent[i + 1],
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pc_temp_ocv->ocv[i+1][j-1],
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ocv);
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}
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if (pcj && pcj_minus_one) {
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pc = linear_interpolate(
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pcj_minus_one,
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pc_temp_ocv->temp[j-1],
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pcj,
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pc_temp_ocv->temp[j],
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batt_temp_degc);
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return pc;
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}
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}
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if (pcj)
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return pcj;
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if (pcj_minus_one)
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return pcj_minus_one;
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pr_debug("%d ocv wasn't found for temp %d in the LUT returning 100%%\n",
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ocv, batt_temp_degc);
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return 100;
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}
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