power: supply: Add driver for Qualcomm PMIC fuel gauge

Ths driver supports the fuel gauge hardware available on PMICs such as PMI8994,
as well as gen 3 fuel gauge hardware available on PMI8998.

Co-developed-by: Caleb Connolly <caleb@connolly.tech>
Co-developed-by: Yassine Oudjana <y.oudjana@protonmail.com>
Signed-off-by: Yassine Oudjana <y.oudjana@protonmail.com>

qcom_fg: expose PROP_STATUS to fix upower not detecting charging status properly

fg: adopt battery info API changes

power: qcom_fg: silence -EPROBE_DEFER error

Sometimes, the devm_power_supply_register function will return
ERR_PTR(-EPROBE_DEFER) to make the driver subsystem probe the fuel guage
later. This is not an error and do not report it as such.

Signed-off-by: Richard Acayan <mailingradian@gmail.com>

power/supply: qcom_fg: add present sysfs property

Present property is required for battery drivers from UPower>=1.90.0
onwards to work properly.

Signed-off-by: Alexander Martinz <amartinz@shiftphones.com>
Signed-off-by: map220v <map220v300@gmail.com>

drivers/power/supply/Kconfig

@@ -1037,4 +1037,12 @@ config FUEL_GAUGE_MM8013
 	  the state of charge, temperature, cycle count, actual and design
 	  capacity, etc.
 
+config BATTERY_QCOM_FG
+	tristate "Qualcomm PMIC fuel gauge driver"
+	depends on MFD_SPMI_PMIC
+	help
+	  Say Y here to enable the Qualcomm PMIC Fuel Gauge driver. This
+	  adds support for battery fuel gauging and state of charge of
+	  battery connected to the fuel gauge.
+
 endif # POWER_SUPPLY

drivers/power/supply/Makefile

@@ -119,3 +119,4 @@ obj-$(CONFIG_CHARGER_SURFACE)	+= surface_charger.o
 obj-$(CONFIG_BATTERY_UG3105)	+= ug3105_battery.o
 obj-$(CONFIG_CHARGER_QCOM_SMB2)	+= qcom_pmi8998_charger.o
 obj-$(CONFIG_FUEL_GAUGE_MM8013)	+= mm8013.o
+obj-$(CONFIG_BATTERY_QCOM_FG)	+= qcom_fg.o