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1// SPDX-License-Identifier: GPL-2.02#include <linux/export.h>3#include <linux/power_supply.h>4#include <linux/of.h>5 6#include "ab8500-bm.h"7 8/* Default: under this temperature, charging is stopped */9#define AB8500_TEMP_UNDER 310/* Default: between this temp and AB8500_TEMP_UNDER charging is reduced */11#define AB8500_TEMP_LOW 812/* Default: between this temp and AB8500_TEMP_OVER charging is reduced */13#define AB8500_TEMP_HIGH 4314/* Default: over this temp, charging is stopped */15#define AB8500_TEMP_OVER 4816/* Default: temperature hysteresis */17#define AB8500_TEMP_HYSTERESIS 318 19static struct power_supply_battery_ocv_table ocv_cap_tbl[] = {20 { .ocv = 4186000, .capacity = 100},21 { .ocv = 4163000, .capacity = 99},22 { .ocv = 4114000, .capacity = 95},23 { .ocv = 4068000, .capacity = 90},24 { .ocv = 3990000, .capacity = 80},25 { .ocv = 3926000, .capacity = 70},26 { .ocv = 3898000, .capacity = 65},27 { .ocv = 3866000, .capacity = 60},28 { .ocv = 3833000, .capacity = 55},29 { .ocv = 3812000, .capacity = 50},30 { .ocv = 3787000, .capacity = 40},31 { .ocv = 3768000, .capacity = 30},32 { .ocv = 3747000, .capacity = 25},33 { .ocv = 3730000, .capacity = 20},34 { .ocv = 3705000, .capacity = 15},35 { .ocv = 3699000, .capacity = 14},36 { .ocv = 3684000, .capacity = 12},37 { .ocv = 3672000, .capacity = 9},38 { .ocv = 3657000, .capacity = 7},39 { .ocv = 3638000, .capacity = 6},40 { .ocv = 3556000, .capacity = 4},41 { .ocv = 3424000, .capacity = 2},42 { .ocv = 3317000, .capacity = 1},43 { .ocv = 3094000, .capacity = 0},44};45 46/*47 * Note that the batres_vs_temp table must be strictly sorted by falling48 * temperature values to work. Factory resistance is 300 mOhm and the49 * resistance values to the right are percentages of 300 mOhm.50 */51static struct power_supply_resistance_temp_table temp_to_batres_tbl_thermistor[] = {52 { .temp = 40, .resistance = 40 /* 120 mOhm */ },53 { .temp = 30, .resistance = 45 /* 135 mOhm */ },54 { .temp = 20, .resistance = 55 /* 165 mOhm */ },55 { .temp = 10, .resistance = 77 /* 230 mOhm */ },56 { .temp = 00, .resistance = 108 /* 325 mOhm */ },57 { .temp = -10, .resistance = 158 /* 445 mOhm */ },58 { .temp = -20, .resistance = 198 /* 595 mOhm */ },59};60 61static struct power_supply_maintenance_charge_table ab8500_maint_charg_table[] = {62 {63 /* Maintenance charging phase A, 60 hours */64 .charge_current_max_ua = 400000,65 .charge_voltage_max_uv = 4050000,66 .charge_safety_timer_minutes = 60*60,67 },68 {69 /* Maintenance charging phase B, 200 hours */70 .charge_current_max_ua = 400000,71 .charge_voltage_max_uv = 4000000,72 .charge_safety_timer_minutes = 200*60,73 }74};75 76static const struct ab8500_bm_capacity_levels cap_levels = {77 .critical = 2,78 .low = 10,79 .normal = 70,80 .high = 95,81 .full = 100,82};83 84static const struct ab8500_fg_parameters fg = {85 .recovery_sleep_timer = 10,86 .recovery_total_time = 100,87 .init_timer = 1,88 .init_discard_time = 5,89 .init_total_time = 40,90 .high_curr_time = 60,91 .accu_charging = 30,92 .accu_high_curr = 30,93 .high_curr_threshold_ua = 50000,94 .lowbat_threshold_uv = 3100000,95 .battok_falling_th_sel0 = 2860,96 .battok_raising_th_sel1 = 2860,97 .maint_thres = 95,98 .user_cap_limit = 15,99 .pcut_enable = 1,100 .pcut_max_time = 127,101 .pcut_flag_time = 112,102 .pcut_max_restart = 15,103 .pcut_debounce_time = 2,104};105 106static const struct ab8500_maxim_parameters ab8500_maxi_params = {107 .ena_maxi = true,108 .chg_curr_ua = 910000,109 .wait_cycles = 10,110 .charger_curr_step_ua = 100000,111};112 113static const struct ab8500_bm_charger_parameters chg = {114 .usb_volt_max_uv = 5500000,115 .usb_curr_max_ua = 1500000,116 .ac_volt_max_uv = 7500000,117 .ac_curr_max_ua = 1500000,118};119 120/* This is referenced directly in the charger code */121struct ab8500_bm_data ab8500_bm_data = {122 .main_safety_tmr_h = 4,123 .temp_interval_chg = 20,124 .temp_interval_nochg = 120,125 .usb_safety_tmr_h = 4,126 .bkup_bat_v = BUP_VCH_SEL_2P6V,127 .bkup_bat_i = BUP_ICH_SEL_150UA,128 .capacity_scaling = false,129 .chg_unknown_bat = false,130 .enable_overshoot = false,131 .fg_res = 100,132 .cap_levels = &cap_levels,133 .interval_charging = 5,134 .interval_not_charging = 120,135 .maxi = &ab8500_maxi_params,136 .chg_params = &chg,137 .fg_params = &fg,138};139 140int ab8500_bm_of_probe(struct power_supply *psy,141 struct ab8500_bm_data *bm)142{143 struct power_supply_battery_info *bi;144 struct device *dev = &psy->dev;145 int ret;146 147 ret = power_supply_get_battery_info(psy, &bm->bi);148 if (ret) {149 dev_err(dev, "cannot retrieve battery info\n");150 return ret;151 }152 bi = bm->bi;153 154 /* Fill in defaults for any data missing from the device tree */155 if (bi->charge_full_design_uah < 0)156 /* The default capacity is 612 mAh for unknown batteries */157 bi->charge_full_design_uah = 612000;158 159 /*160 * All of these voltages need to be specified or we will simply161 * fall back to safe defaults.162 */163 if ((bi->voltage_min_design_uv < 0) ||164 (bi->voltage_max_design_uv < 0)) {165 /* Nominal voltage is 3.7V for unknown batteries */166 bi->voltage_min_design_uv = 3700000;167 /* Termination voltage 4.05V */168 bi->voltage_max_design_uv = 4050000;169 }170 171 if (bi->constant_charge_current_max_ua < 0)172 bi->constant_charge_current_max_ua = 400000;173 174 if (bi->constant_charge_voltage_max_uv < 0)175 bi->constant_charge_voltage_max_uv = 4100000;176 177 if (bi->charge_term_current_ua)178 /* Charging stops when we drop below this current */179 bi->charge_term_current_ua = 200000;180 181 if (!bi->maintenance_charge || !bi->maintenance_charge_size) {182 bi->maintenance_charge = ab8500_maint_charg_table;183 bi->maintenance_charge_size = ARRAY_SIZE(ab8500_maint_charg_table);184 }185 186 if (bi->alert_low_temp_charge_current_ua < 0 ||187 bi->alert_low_temp_charge_voltage_uv < 0)188 {189 bi->alert_low_temp_charge_current_ua = 300000;190 bi->alert_low_temp_charge_voltage_uv = 4000000;191 }192 if (bi->alert_high_temp_charge_current_ua < 0 ||193 bi->alert_high_temp_charge_voltage_uv < 0)194 {195 bi->alert_high_temp_charge_current_ua = 300000;196 bi->alert_high_temp_charge_voltage_uv = 4000000;197 }198 199 /*200 * Internal resistance and factory resistance are tightly coupled201 * so both MUST be defined or we fall back to defaults.202 */203 if ((bi->factory_internal_resistance_uohm < 0) ||204 !bi->resist_table) {205 bi->factory_internal_resistance_uohm = 300000;206 bi->resist_table = temp_to_batres_tbl_thermistor;207 bi->resist_table_size = ARRAY_SIZE(temp_to_batres_tbl_thermistor);208 }209 210 /* The default battery is emulated by a resistor at 7K */211 if (bi->bti_resistance_ohm < 0 ||212 bi->bti_resistance_tolerance < 0) {213 bi->bti_resistance_ohm = 7000;214 bi->bti_resistance_tolerance = 20;215 }216 217 if (!bi->ocv_table[0]) {218 /* Default capacity table at say 25 degrees Celsius */219 bi->ocv_temp[0] = 25;220 bi->ocv_table[0] = ocv_cap_tbl;221 bi->ocv_table_size[0] = ARRAY_SIZE(ocv_cap_tbl);222 }223 224 if (bi->temp_min == INT_MIN)225 bi->temp_min = AB8500_TEMP_UNDER;226 if (bi->temp_max == INT_MAX)227 bi->temp_max = AB8500_TEMP_OVER;228 if (bi->temp_alert_min == INT_MIN)229 bi->temp_alert_min = AB8500_TEMP_LOW;230 if (bi->temp_alert_max == INT_MAX)231 bi->temp_alert_max = AB8500_TEMP_HIGH;232 bm->temp_hysteresis = AB8500_TEMP_HYSTERESIS;233 234 return 0;235}236 237void ab8500_bm_of_remove(struct power_supply *psy,238 struct ab8500_bm_data *bm)239{240 power_supply_put_battery_info(psy, bm->bi);241}242