include/linux/power_supply.h

1 /* SPDX-License-Identifier: GPL-2.0-only */
226 /* Run-time specific power supply configuration */
349 	int temp;	/* celsius */  member
350 	int resistance;	/* internal resistance percent */  member
355 	int ri_uohm;	/* Internal resistance in microohm */
359  * struct power_supply_maintenance_charge_table - setting for maintenace charging
392  *  +-------------------------------------------------------------------> t
394  * Practically this means that the Li-ions are wandering back and forth in the
405  *  +-------------------------------------------------------------------> t
407  * Maintenance charging uses the voltages from this table: a table of settings
416  * As an example, a Samsung EB425161LA Lithium-Ion battery is CC/CV charged
431  * the expected stand-by current. Also overvoltage protection will be applied
443  * struct power_supply_battery_info - information about batteries
502  * @factory_internal_resistance_uohm: the internal resistance of the battery
503  *   at fabrication time, expressed in microohms. This resistance will vary
505  *   nominal ballpark figure. This internal resistance is given for the state
507  * @factory_internal_resistance_charging_uohm: the internal resistance of the
509  *   The charging process will affect the internal resistance of the battery
510  *   so this value provides a better resistance under these circumstances.
511  *   This resistance will vary depending on the lifetime and charge of the
515  *   indicating which capacity table to use for a certain temperature, since
541  * @resist_table: this is a table that correlates a battery temperature to the
542  *   expected internal resistance at this temperature. The resistance is given
544  *   resistance of the battery is usually necessary for calculating the open
547  *   by temperature: highest temperature with lowest resistance first, lowest
548  *   temperature with highest resistance last.
550  * @vbat2ri_discharging: this is a table that correlates Battery voltage (VBAT)
551  *   to internal resistance (Ri). The resistance is given in microohm for the
552  *   corresponding voltage in microvolts. The internal resistance is used to
554  *   of the battery. These voltages to resistance tables apply when the battery
555  *   is discharging. The table must be ordered descending by voltage: highest
558  *   table.
561  *   internal resistance characteristics so a separate table is needed.*
562  *   The table must be ordered descending by voltage: highest voltage first.
564  *   table.
565  * @bti_resistance_ohm: The Battery Type Indicator (BIT) nominal resistance
569  * @bti_resistance_tolerance: The tolerance in percent of the BTI resistance,
570  *   for example 10 for +/- 10%, if the bti_resistance is set to 7000 and the
571  *   tolerance is 10% we will detect a proper battery if the BTI resistance
579  * The default field value is -EINVAL or NULL for pointers.
588  * |                                               --- overvoltage_limit_uv
601  * +------------------------------------------------------------------> time
618  * +-----------------------------------------------------------------> time
629  * 2. Next a small initial pre-charge current (precharge_current_ua)
670  * many chargers uses a so-called fuel gauge or coloumb counter that measure
671  * how much charge goes into the battery and how much goes out (+/- leak
675  * the open circuit voltage with a look-up table to determine the rough
677  * with an ideal voltage source (V) in series with an internal resistance (Ri)
680  *      +-------> IBAT >----------------+
684  *      o <----------        |          |
686  *    .---.         |        |          |
688  *    '---'         |        |          |
690  *  GND +-------------------------------+
692  * If we disconnect the load (here simplified as a fixed resistance Rload)
705  *   OCV = VBAT - (IBAT * Ri)
713  * resistance change, and it will affect the VBAT under load, so correlating
721  * the purpose of the table resist_table: this will take a temperature and
805 extern int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
809 				int temp, int *table_len);
811 					int ocv, int temp);
813 power_supply_temp2resist_simple(struct power_supply_resistance_temp_table *table,
814 				int table_len, int temp);
820 					      int resistance);
841 	return ((info->vbat2ri_discharging != NULL) &&  in power_supply_supports_vbat2ri()
842 		info->vbat2ri_discharging_size > 0);  in power_supply_supports_vbat2ri()
848 	return ((info->resist_table != NULL) &&  in power_supply_supports_temp2ri()
849 		info->resist_table_size > 0);  in power_supply_supports_temp2ri()
855 static inline int power_supply_is_system_supplied(void) { return -ENOSYS; }  in power_supply_is_system_supplied()
981 	return -EOPNOTSUPP;  in power_supply_charge_behaviour_show()
987 	return -EOPNOTSUPP;  in power_supply_charge_behaviour_parse()