// SPDX-License-Identifier: GPL-2.0
#include <linux/export.h>
#include <linux/power_supply.h>
#include <linux/of.h>
#include "ab8500-bm.h"
/* Default: under this temperature, charging is stopped */
#define AB8500_TEMP_UNDER 3
/* Default: between this temp and AB8500_TEMP_UNDER charging is reduced */
#define AB8500_TEMP_LOW 8
/* Default: between this temp and AB8500_TEMP_OVER charging is reduced */
#define AB8500_TEMP_HIGH 43
/* Default: over this temp, charging is stopped */
#define AB8500_TEMP_OVER 48
/* Default: temperature hysteresis */
#define AB8500_TEMP_HYSTERESIS 3
static struct power_supply_battery_ocv_table ocv_cap_tbl[] = {
{ .ocv = 4186000, .capacity = 100},
{ .ocv = 4163000, .capacity = 99},
{ .ocv = 4114000, .capacity = 95},
{ .ocv = 4068000, .capacity = 90},
{ .ocv = 3990000, .capacity = 80},
{ .ocv = 3926000, .capacity = 70},
{ .ocv = 3898000, .capacity = 65},
{ .ocv = 3866000, .capacity = 60},
{ .ocv = 3833000, .capacity = 55},
{ .ocv = 3812000, .capacity = 50},
{ .ocv = 3787000, .capacity = 40},
{ .ocv = 3768000, .capacity = 30},
{ .ocv = 3747000, .capacity = 25},
{ .ocv = 3730000, .capacity = 20},
{ .ocv = 3705000, .capacity = 15},
{ .ocv = 3699000, .capacity = 14},
{ .ocv = 3684000, .capacity = 12},
{ .ocv = 3672000, .capacity = 9},
{ .ocv = 3657000, .capacity = 7},
{ .ocv = 3638000, .capacity = 6},
{ .ocv = 3556000, .capacity = 4},
{ .ocv = 3424000, .capacity = 2},
{ .ocv = 3317000, .capacity = 1},
{ .ocv = 3094000, .capacity = 0},
};
/*
* Note that the batres_vs_temp table must be strictly sorted by falling
* temperature values to work. Factory resistance is 300 mOhm and the
* resistance values to the right are percentages of 300 mOhm.
*/
static struct power_supply_resistance_temp_table temp_to_batres_tbl_thermistor[] = {
{ .temp = 40, .resistance = 40 /* 120 mOhm */ },
{ .temp = 30, .resistance = 45 /* 135 mOhm */ },
{ .temp = 20, .resistance = 55 /* 165 mOhm */ },
{ .temp = 10, .resistance = 77 /* 230 mOhm */ },
{ .temp = 00, .resistance = 108 /* 325 mOhm */ },
{ .temp = -10, .resistance = 158 /* 445 mOhm */ },
{ .temp = -20, .resistance = 198 /* 595 mOhm */ },
};
static struct power_supply_maintenance_charge_table ab8500_maint_charg_table[] = {
{
/* Maintenance charging phase A, 60 hours */
.charge_current_max_ua = 400000,
.charge_voltage_max_uv = 4050000,
.charge_safety_timer_minutes = 60*60,
},
{
/* Maintenance charging phase B, 200 hours */
.charge_current_max_ua = 400000,
.charge_voltage_max_uv = 4000000,
.charge_safety_timer_minutes = 200*60,
}
};
static const struct ab8500_bm_capacity_levels cap_levels = {
.critical = 2,
.low = 10,
.normal = 70,
.high = 95,
.full = 100,
};
static const struct ab8500_fg_parameters fg = {
.recovery_sleep_timer = 10,
.recovery_total_time = 100,
.init_timer = 1,
.init_discard_time = 5,
.init_total_time = 40,
.high_curr_time = 60,
.accu_charging = 30,
.accu_high_curr = 30,
.high_curr_threshold_ua = 50000,
.lowbat_threshold_uv = 3100000,
.battok_falling_th_sel0 = 2860,
.battok_raising_th_sel1 = 2860,
.maint_thres = 95,
.user_cap_limit = 15,
.pcut_enable = 1,
.pcut_max_time = 127,
.pcut_flag_time = 112,
.pcut_max_restart = 15,
.pcut_debounce_time = 2,
};
static const struct ab8500_maxim_parameters ab8500_maxi_params = {
.ena_maxi = true,
.chg_curr_ua = 910000,
.wait_cycles = 10,
.charger_curr_step_ua = 100000,
};
static const struct ab8500_bm_charger_parameters chg = {
.usb_volt_max_uv = 5500000,
.usb_curr_max_ua = 1500000,
.ac_volt_max_uv = 7500000,
.ac_curr_max_ua = 1500000,
};
/* This is referenced directly in the charger code */
struct ab8500_bm_data ab8500_bm_data = {
.main_safety_tmr_h = 4,
.temp_interval_chg = 20,
.temp_interval_nochg = 120,
.usb_safety_tmr_h = 4,
.bkup_bat_v = BUP_VCH_SEL_2P6V,
.bkup_bat_i = BUP_ICH_SEL_150UA,
.capacity_scaling = false,
.chg_unknown_bat = false,
.enable_overshoot = false,
.fg_res = 100,
.cap_levels = &cap_levels,
.interval_charging = 5,
.interval_not_charging = 120,
.maxi = &ab8500_maxi_params,
.chg_params = &chg,
.fg_params = &fg,
};
int ab8500_bm_of_probe(struct power_supply *psy,
struct ab8500_bm_data *bm)
{
struct power_supply_battery_info *bi;
struct device *dev = &psy->dev;
int ret;
ret = power_supply_get_battery_info(psy, &bm->bi);
if (ret) {
dev_err(dev, "cannot retrieve battery info\n");
return ret;
}
bi = bm->bi;
/* Fill in defaults for any data missing from the device tree */
if (bi->charge_full_design_uah < 0)
/* The default capacity is 612 mAh for unknown batteries */
bi->charge_full_design_uah = 612000;
/*
* All of these voltages need to be specified or we will simply
* fall back to safe defaults.
*/
if ((bi->voltage_min_design_uv < 0) ||
(bi->voltage_max_design_uv < 0)) {
/* Nominal voltage is 3.7V for unknown batteries */
bi->voltage_min_design_uv = 3700000;
/* Termination voltage 4.05V */
bi->voltage_max_design_uv = 4050000;
}
if (bi->constant_charge_current_max_ua < 0)
bi->constant_charge_current_max_ua = 400000;
if (bi->constant_charge_voltage_max_uv < 0)
bi->constant_charge_voltage_max_uv = 4100000;
if (bi->charge_term_current_ua)
/* Charging stops when we drop below this current */
bi->charge_term_current_ua = 200000;
if (!bi->maintenance_charge || !bi->maintenance_charge_size) {
bi->maintenance_charge = ab8500_maint_charg_table;
bi->maintenance_charge_size = ARRAY_SIZE(ab8500_maint_charg_table);
}
if (bi->alert_low_temp_charge_current_ua < 0 ||
bi->alert_low_temp_charge_voltage_uv < 0)
{
bi->alert_low_temp_charge_current_ua = 300000;
bi->alert_low_temp_charge_voltage_uv = 4000000;
}
if (bi->alert_high_temp_charge_current_ua < 0 ||
bi->alert_high_temp_charge_voltage_uv < 0)
{
bi->alert_high_temp_charge_current_ua = 300000;
bi->alert_high_temp_charge_voltage_uv = 4000000;
}
/*
* Internal resistance and factory resistance are tightly coupled
* so both MUST be defined or we fall back to defaults.
*/
if ((bi->factory_internal_resistance_uohm < 0) ||
!bi->resist_table) {
bi->factory_internal_resistance_uohm = 300000;
bi->resist_table = temp_to_batres_tbl_thermistor;
bi->resist_table_size = ARRAY_SIZE(temp_to_batres_tbl_thermistor);
}
/* The default battery is emulated by a resistor at 7K */
if (bi->bti_resistance_ohm < 0 ||
bi->bti_resistance_tolerance < 0) {
bi->bti_resistance_ohm = 7000;
bi->bti_resistance_tolerance = 20;
}
if (!bi->ocv_table[0]) {
/* Default capacity table at say 25 degrees Celsius */
bi->ocv_temp[0] = 25;
bi->ocv_table[0] = ocv_cap_tbl;
bi->ocv_table_size[0] = ARRAY_SIZE(ocv_cap_tbl);
}
if (bi->temp_min == INT_MIN)
bi->temp_min = AB8500_TEMP_UNDER;
if (bi->temp_max == INT_MAX)
bi->temp_max = AB8500_TEMP_OVER;
if (bi->temp_alert_min == INT_MIN)
bi->temp_alert_min = AB8500_TEMP_LOW;
if (bi->temp_alert_max == INT_MAX)
bi->temp_alert_max = AB8500_TEMP_HIGH;
bm->temp_hysteresis = AB8500_TEMP_HYSTERESIS;
return 0;
}
void ab8500_bm_of_remove(struct power_supply *psy,
struct ab8500_bm_data *bm)
{
power_supply_put_battery_info(psy, bm->bi);
}