These two patches begin to put new stuff into the
drivers/power/supply/ab8500_bmdata.c for:
A) battery temperature look-up and interpolation, and
B) maintenance charging
Some design choices can be discussed, so I included some
HWMON etc maintainers.
NTC resistor:
For the battery NTC temperature we should note the existing NTC
driver in drivers/hwmon/ntc_thermistor.c with bindings
in Documentation/devicetree/bindings/hwmon/ntc-thermistor.yaml
which is used for stand-alone NTC resistors.
It is probably possible to try to reuse the hwmon code but I
wanted to see if we have buy-in from the hwmon maintainer first.
If yes, I will try to come up with some way of representing the
NTC resistor in the device tree and use it in-tree from the
charging drivers.
Maintenance charging:
I included an infrastructure for maintenance "charging points"
which constitute of a current, a voltage and a safety timer:
struct power_supply_maintenance_charge_table {
int charge_current_max_ua;
int charge_voltage_max_uv;
int charge_safety_timer_minutes;
};
This is all pretty straight-forward if just adding maintenance
charging.
For the bigger picture, however, a charging point can also
include the existing CC/CV current and voltage and the
precharging current and voltage as two charging points,
possibly without corresponding safety timer. If this is
desired I will rework the patch to refactor the existing
currents and voltages into charging points as well.
Linus Walleij (2):
power: supply: ab8500: Standardize NTC battery temp
power: supply: ab8500: Standardize maintenance charging
drivers/power/supply/ab8500-bm.h | 30 --------
drivers/power/supply/ab8500_bmdata.c | 68 +++++++++-------
drivers/power/supply/ab8500_btemp.c | 45 +----------
drivers/power/supply/ab8500_chargalg.c | 41 +++++++---
drivers/power/supply/power_supply_core.c | 63 +++++++++++++++
include/linux/power_supply.h | 98 ++++++++++++++++++++++++
6 files changed, 237 insertions(+), 108 deletions(-)
--
2.31.1
