ab8500_bmdata.c (7322B)
1// SPDX-License-Identifier: GPL-2.0 2#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 3 10/* Default: between this temp and AB8500_TEMP_UNDER charging is reduced */ 11#define AB8500_TEMP_LOW 8 12/* Default: between this temp and AB8500_TEMP_OVER charging is reduced */ 13#define AB8500_TEMP_HIGH 43 14/* Default: over this temp, charging is stopped */ 15#define AB8500_TEMP_OVER 48 16/* Default: temperature hysteresis */ 17#define AB8500_TEMP_HYSTERESIS 3 18 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 falling 48 * temperature values to work. Factory resistance is 300 mOhm and the 49 * 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 simply 161 * 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 coupled 201 * 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}