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