power: supply: core: Add new "charge_types" property

Add a new "charge_types" property, this is identical to "charge_type" but
reading returns a list of supported charge-types with the currently active
type surrounded by square brackets, e.g.:

Fast [Standard] "Long_Life"

This has the advantage over the existing "charge_type" property that this
allows userspace to find out which charge-types are supported for writable
charge_type properties.

Drivers which already support "charge_type" can easily add support for
this by setting power_supply_desc.charge_types to a bitmask representing
valid charge_type values. The existing "charge_type" get_property() and
set_property() code paths can be re-used for "charge_types".

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20241211174451.355421-3-hdegoede@redhat.com


Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>