power: qpnp-vm-bms: Add QPNP voltage mode(VM) BMS driver

Qualcomm's QPNP Voltage-Mode(VM) PMIC Battery Management System

QPNP PMIC VM BMS provides interface to clients to read properties related

to the battery. Its main function is to calculate the SOC (state of charge)

of the battery based on periodic sampling of the VBAT (battery voltage).

Parent node required properties:

- compatible	: Must be  "qcom,qpnp-vm-bms" for the BM driver.

- reg		: Offset and length of the PMIC peripheral register map.

- interrupts	: The interrupt mappings.

		  The format should be

		  <slave-id peripheral-id interrupt-number>.

- interrupt-names : names for the mapped bms interrupt

		The following interrupts are required:

		0 : leave CV state

		1 : enter CV state

		2 : good ocv generated

		3 : ocv_thr

		4 : fifo update

		5 : fsm state chnaged

Additionally, optional subnodes may be included:

- qcom,batt-pres-status : A subnode with a register address for the SMBB

		battery interface's BATT_PRES_STATUS register. If this node is

		added, then the BMS will try to detect offmode battery removal

		via the battery interface's offmode battery removal circuit.

- qcom,battery-data : A phandle to a node containing the available batterydata

		profiles. See the batterydata bindings documentation for more

		details.

Parent node required properties:

- qcom,v-cutoff-uv : cutoff voltage where the battery is considered dead in

			micro-volts.

- qcom,max-voltage-uv : maximum voltage for the battery in micro-volts.

- qcom,r-conn-mohm : connector resistance in milli-ohms.

- qcom,shutdown-soc-valid-limit : If the ocv upon restart is within this

			distance of the shutdown ocv, the BMS will try to force

			the new SoC to the old one to provide charge continuity.

			That is to say,

				if (abs(shutdown-soc - current-soc) < limit)

				then use old SoC.

- qcom,low-soc-calculate-soc-threshold : The SoC threshold for when

			the periodic calculate_soc work speeds up. This ensures

			SoC is updated in userspace constantly when we are near

			shutdown.

- qcom,low-voltage-threshold : The battery voltage threshold in micro-volts for

			when the BMS tries to wake up and hold a wakelock to

			ensure a clean shutdown.

- qcom,low-voltage-calculate-soc-ms : The time period between subsequent

			SoC recalculations when the current voltage is below

			qcom,low-voltage threshold. This takes precedence over

			qcom,low-soc-calculate-soc-ms.

- qcom,low-soc-calculate-soc-ms : The time period between subsequent

			SoC recalculations when the current SoC is below

			qcom,low-soc-calculate-soc-threshold. This takes

			precedence over qcom,calculate-soc-ms.

- qcom,calculate-soc-ms : The time period between subsequent SoC

			recalculations when the current SoC is above or equal

			qcom,low-soc-calculate-soc-threshold.

- qcom,volatge-soc-timeout-ms : The timeout period after which the module starts

			reporting volage based SOC and does not use the VMBMS

			algorithm for SOC calculation.

- qcom,bms-vadc: Corresponding VADC device's phandle.

Parent node Optional properties

- qcom,s1-sample-interval-ms: The sampling rate in ms of the accumulator in state

			S1. (i.e) the rate at which the accumulator is being

			filled with vbat samples. Minimum value = 0 and

			Maximum value = 2550ms.

- qcom,s2-sample-interval-ms: The sampling rate in ms of the accumulator in state

			S2. (i.e) the rate at which the accumulator is being

			filled with vbat samples. Minimum value = 0 and

			Maximum value = 2550ms.

- qcom,s1-sample-count: The number of samples to be accululated for one FIFO in

			state S1. Possible values are - 0, 4, 8, 16, 32, 64, 128,

			256.

- qcom,s2-sample-count: The number of samples to be accululated for one FIFO in

			state S2. Possible values are - 0, 4, 8, 16, 32, 64, 128,

			256.

- qcom,s1-fifo-legth:	Number of FIFO's to be filled in state S1, to generate

			the fifo_update_done interrupt. Possile values - 0 to 8

- qcom,s2-fifo-legth:	Number of FIFO's to be filled in state S2, to generate

			the fifo_update_done interrupt. Possible values- 0 to 8

- qcom,force-s2-in-charging: Bool property to force the BMS into S2 (CV) state

			during charging

- qcom,force-s3-on-suspend : Bool property to force the BMS into S3 (sleep) state

			while entering into system suspend.

- qcom,report-charger-eoc : Bool property to indicate if BMS needs to indicate

			EOC to charger.

- qcom,ignore-shutdown-soc: A boolean that controls whether BMS will

			try to force the startup SoC to be the same as the

			shutdown SoC. Defining it will make BMS ignore the

			shutdown SoC.

- qcom,use-voltage-soc : A boolean that controls whether BMS will use

			voltage-based SoC instead of a coulomb counter based

			one. Voltage-based SoC will not guarantee linearity.

qcom,batt-pres-status node required properties:

- reg : offset and length of the PMIC LBC battery interface BATT_PRES_STATUS

		register.

qcom,qpnp-chg-pres required properties:

- reg : offset and length of the PMIC LBC charger interafce CHARGER_OPTION

		register.

Example:

pm8916_bms: qcom,qpnp-vm-bms {

	spmi-dev-container;

	compatible = "qcom,qpnp-vm-bms";

	#address-cells = <1>;

	#size-cells = <1>;

	status = "disabled";

	qcom,v-cutoff-uv = <3400000>;

	qcom,max-voltage-uv = <4200000>;

	qcom,r-conn-mohm = <18>;

	qcom,shutdown-soc-valid-limit = <20>;

	qcom,low-soc-calculate-soc-threshold = <15>;

	qcom,low-voltage-threshold = <3420000>;

	qcom,low-voltage-calculate-soc-ms = <1000>;

	qcom,low-soc-calculate-soc-ms = <5000>;

	qcom,calculate-soc-ms = <20000>;

	qcom,volatge-soc-timeout-ms = <60000>;

	qcom,battery-data = <&mtp_batterydata>;

	qcom,bms-vadc = <&pm8916_vadc>;

	qcom,batt-pres-status@1208 {

		reg = <0x1208 0x1>;

	}

	qcom,qpnp-chg-pres@1208 {

		reg = <0x1108 0x1>;

	}

	qcom,bms-bms@4000 {

		reg = <0x4000 0x100>;

		interrupts =	<0x0 0x40 0x0>,

				<0x0 0x40 0x1>,

				<0x0 0x40 0x2>,

				<0x0 0x40 0x3>,

				<0x0 0x40 0x4>,

				<0x0 0x40 0x5>,

		interrupt-names = "leave_cv",

				  "enter_cv",

				  "good_ocv",

				  "ocv_thr",

				  "fifo_updtaed",

				  "fsm_state_change";

	};

};

	  Say Y to enable support for the battery and AC power in the

	  Goldfish emulator.

config QPNP_VM_BMS

	tristate "QPNP Voltage-Mode Battery Monitoring System driver"

	depends on SPMI

	depends on MSM_QPNP_INT

	help

	  Say Y here to enable support for QPNP chip vm-bms device.

	  The voltage-mode (vm) BMS driver uses periodic VBATT

	  readings from the battery to calculate the State of

	  Charge.

config QPNP_BMS

	tristate "QPNP Battery Monitoring System driver"

	depends on SPMI

obj-$(CONFIG_BATTERY_BQ28400)	+= bq28400_battery.o

obj-$(CONFIG_SMB137C_CHARGER)	+= smb137c-charger.o

obj-$(CONFIG_QPNP_BMS)		+= qpnp-bms.o batterydata-lib.o

obj-$(CONFIG_QPNP_VM_BMS)	+= qpnp-vm-bms.o batterydata-lib.o batterydata-interface.o

obj-$(CONFIG_QPNP_CHARGER)	+= qpnp-charger.o

obj-$(CONFIG_CHARGER_SMB347)	+= smb347-charger.o

obj-$(CONFIG_CHARGER_TPS65090)	+= tps65090-charger.o

#if defined(CONFIG_PM8921_BMS) || \

	defined(CONFIG_PM8921_BMS_MODULE) || \

	defined(CONFIG_QPNP_BMS)

	defined(CONFIG_QPNP_BMS) || \

	defined(CONFIG_QPNP_VM_BMS)

extern struct bms_battery_data  palladium_1500_data;

extern struct bms_battery_data  desay_5200_data;

extern struct bms_battery_data  oem_batt_data;