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 19 static 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 */ 51 static 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 61 static 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 76 /* Default battery type for reference designs is the unknown type */ 77 static struct ab8500_battery_type bat_type_thermistor_unknown = { 78 .resis_high = 0, 79 .resis_low = 0, 80 .low_high_cur_lvl = 300, 81 .low_high_vol_lvl = 4000, 82 }; 83 84 static const struct ab8500_bm_capacity_levels cap_levels = { 85 .critical = 2, 86 .low = 10, 87 .normal = 70, 88 .high = 95, 89 .full = 100, 90 }; 91 92 static const struct ab8500_fg_parameters fg = { 93 .recovery_sleep_timer = 10, 94 .recovery_total_time = 100, 95 .init_timer = 1, 96 .init_discard_time = 5, 97 .init_total_time = 40, 98 .high_curr_time = 60, 99 .accu_charging = 30, 100 .accu_high_curr = 30, 101 .high_curr_threshold_ua = 50000, 102 .lowbat_threshold_uv = 3100000, 103 .battok_falling_th_sel0 = 2860, 104 .battok_raising_th_sel1 = 2860, 105 .maint_thres = 95, 106 .user_cap_limit = 15, 107 .pcut_enable = 1, 108 .pcut_max_time = 127, 109 .pcut_flag_time = 112, 110 .pcut_max_restart = 15, 111 .pcut_debounce_time = 2, 112 }; 113 114 static const struct ab8500_maxim_parameters ab8500_maxi_params = { 115 .ena_maxi = true, 116 .chg_curr_ua = 910000, 117 .wait_cycles = 10, 118 .charger_curr_step_ua = 100000, 119 }; 120 121 static const struct ab8500_bm_charger_parameters chg = { 122 .usb_volt_max_uv = 5500000, 123 .usb_curr_max_ua = 1500000, 124 .ac_volt_max_uv = 7500000, 125 .ac_curr_max_ua = 1500000, 126 }; 127 128 /* This is referenced directly in the charger code */ 129 struct ab8500_bm_data ab8500_bm_data = { 130 .main_safety_tmr_h = 4, 131 .temp_interval_chg = 20, 132 .temp_interval_nochg = 120, 133 .usb_safety_tmr_h = 4, 134 .bkup_bat_v = BUP_VCH_SEL_2P6V, 135 .bkup_bat_i = BUP_ICH_SEL_150UA, 136 .capacity_scaling = false, 137 .chg_unknown_bat = false, 138 .enable_overshoot = false, 139 .fg_res = 100, 140 .cap_levels = &cap_levels, 141 .bat_type = &bat_type_thermistor_unknown, 142 .interval_charging = 5, 143 .interval_not_charging = 120, 144 .maxi = &ab8500_maxi_params, 145 .chg_params = &chg, 146 .fg_params = &fg, 147 }; 148 149 int ab8500_bm_of_probe(struct power_supply *psy, 150 struct ab8500_bm_data *bm) 151 { 152 struct power_supply_battery_info *bi; 153 struct device *dev = &psy->dev; 154 int ret; 155 156 ret = power_supply_get_battery_info(psy, &bm->bi); 157 if (ret) { 158 dev_err(dev, "cannot retrieve battery info\n"); 159 return ret; 160 } 161 bi = bm->bi; 162 163 /* Fill in defaults for any data missing from the device tree */ 164 if (bi->charge_full_design_uah < 0) 165 /* The default capacity is 612 mAh for unknown batteries */ 166 bi->charge_full_design_uah = 612000; 167 168 /* 169 * All of these voltages need to be specified or we will simply 170 * fall back to safe defaults. 171 */ 172 if ((bi->voltage_min_design_uv < 0) || 173 (bi->voltage_max_design_uv < 0)) { 174 /* Nominal voltage is 3.7V for unknown batteries */ 175 bi->voltage_min_design_uv = 3700000; 176 /* Termination voltage 4.05V */ 177 bi->voltage_max_design_uv = 4050000; 178 } 179 180 if (bi->constant_charge_current_max_ua < 0) 181 bi->constant_charge_current_max_ua = 400000; 182 183 if (bi->constant_charge_voltage_max_uv < 0) 184 bi->constant_charge_voltage_max_uv = 4100000; 185 186 if (bi->charge_term_current_ua) 187 /* Charging stops when we drop below this current */ 188 bi->charge_term_current_ua = 200000; 189 190 if (!bi->maintenance_charge || !bi->maintenance_charge_size) { 191 bi->maintenance_charge = ab8500_maint_charg_table; 192 bi->maintenance_charge_size = ARRAY_SIZE(ab8500_maint_charg_table); 193 } 194 195 /* 196 * Internal resistance and factory resistance are tightly coupled 197 * so both MUST be defined or we fall back to defaults. 198 */ 199 if ((bi->factory_internal_resistance_uohm < 0) || 200 !bi->resist_table) { 201 bi->factory_internal_resistance_uohm = 300000; 202 bi->resist_table = temp_to_batres_tbl_thermistor; 203 bi->resist_table_size = ARRAY_SIZE(temp_to_batres_tbl_thermistor); 204 } 205 206 if (!bi->ocv_table[0]) { 207 /* Default capacity table at say 25 degrees Celsius */ 208 bi->ocv_temp[0] = 25; 209 bi->ocv_table[0] = ocv_cap_tbl; 210 bi->ocv_table_size[0] = ARRAY_SIZE(ocv_cap_tbl); 211 } 212 213 if (bi->temp_min == INT_MIN) 214 bi->temp_min = AB8500_TEMP_UNDER; 215 if (bi->temp_max == INT_MAX) 216 bi->temp_max = AB8500_TEMP_OVER; 217 if (bi->temp_alert_min == INT_MIN) 218 bi->temp_alert_min = AB8500_TEMP_LOW; 219 if (bi->temp_alert_max == INT_MAX) 220 bi->temp_alert_max = AB8500_TEMP_HIGH; 221 bm->temp_hysteresis = AB8500_TEMP_HYSTERESIS; 222 223 return 0; 224 } 225 226 void ab8500_bm_of_remove(struct power_supply *psy, 227 struct ab8500_bm_data *bm) 228 { 229 power_supply_put_battery_info(psy, bm->bi); 230 } 231