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Commit d330d0af authored by Xiaozhe Shi's avatar Xiaozhe Shi
Browse files

power: qpnp-fg: configure cutoff voltage via devicetree 



Expose the fuel gauge cutoff voltage in the devicetree, so that users
can configure the zero point of the battery model.

CRs-Fixed: 771380
Change-Id: Ie20509bc5900a636c5624bdea0df04b394ee1c32
Signed-off-by: default avatarXiaozhe Shi <xiaozhes@codeaurora.org>
parent a4df3dc9

Documentation/devicetree/bindings/power/qpnp-fg.txt

+6 −0
Original line number Diff line number Diff line
@@ -65,6 +65,12 @@ Parent node optional properties: 
					power supply framework. The userspace

					will read 0% soc and immediately

					shutdown.

- qcom,fg-cutoff-voltage-mv:		The voltage where the fuel gauge will

					steer the SOC to be zero. For example,

					if the cutoff voltage is set to 3400mv,

					the fuel gauge will try to count SoC so

					that the battery SoC will be 0 when it

					is 3400mV.



qcom,fg-soc node required properties:

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

drivers/power/qpnp-fg.c

+21 −0
Original line number Diff line number Diff line
@@ -120,6 +120,7 @@ enum fg_mem_setting_index { 
	FG_MEM_BCL_MH_THRESHOLD,

	FG_MEM_TERM_CURRENT,

	FG_MEM_IRQ_VOLT_EMPTY,

	FG_MEM_CUTOFF_VOLTAGE,

	FG_MEM_SETTING_MAX,

};
@@ -154,6 +155,7 @@ static struct fg_mem_setting settings[FG_MEM_SETTING_MAX] = { 
	SETTING(BCL_MH_THRESHOLD, 0x47C,   3,      752),

	SETTING(TERM_CURRENT,	 0x40C,   2,      250),

	SETTING(IRQ_VOLT_EMPTY,	 0x458,   3,      3350),

	SETTING(CUTOFF_VOLTAGE,	 0x40C,   0,      3400),

};



#define DATA(_idx, _address, _offset, _length,  _value)	\
@@ -1979,6 +1981,23 @@ static int update_irq_volt_empty(struct fg_chip *chip) 


#define MICROUNITS_TO_ADC_RAW(units)	\

			div64_s64(units * LSB_16B_DENMTR, LSB_16B_NUMRTR)

static int update_cutoff_voltage(struct fg_chip *chip)

{

	u8 data[2];

	u16 converted_voltage_raw;

	s64 voltage_mv = settings[FG_MEM_CUTOFF_VOLTAGE].value;



	converted_voltage_raw = (s16)MICROUNITS_TO_ADC_RAW(voltage_mv * 1000);

	data[0] = cpu_to_le16(converted_voltage_raw) & 0xFF;

	data[1] = cpu_to_le16(converted_voltage_raw) >> 8;



	if (fg_debug_mask & FG_STATUS)

		pr_info("voltage = %lld, converted_raw = %04x, data = %02x %02x\n",

			voltage_mv, converted_voltage_raw, data[0], data[1]);

	return fg_mem_write(chip, data, settings[FG_MEM_CUTOFF_VOLTAGE].address,

				2, settings[FG_MEM_CUTOFF_VOLTAGE].offset, 0);

}



static int update_iterm(struct fg_chip *chip)

{

	u8 data[2];
@@ -2010,6 +2029,7 @@ static int fg_of_init(struct fg_chip *chip) 
	OF_READ_SETTING(FG_MEM_BCL_MH_THRESHOLD, "bcl-mh-threshold-ma",

		rc, 1);

	OF_READ_SETTING(FG_MEM_TERM_CURRENT, "fg-iterm-ma", rc, 1);

	OF_READ_SETTING(FG_MEM_CUTOFF_VOLTAGE, "fg-cutoff-voltage-mv", rc, 1);

	data = of_get_property(chip->spmi->dev.of_node,

			"qcom,thermal-coefficients", &len);

	if (data && len == THERMAL_COEFF_N_BYTES) {
@@ -2644,6 +2664,7 @@ static int fg_hw_init(struct fg_chip *chip) 
	int rc = 0;



	update_iterm(chip);

	update_cutoff_voltage(chip);

	update_irq_volt_empty(chip);

	update_bcl_thresholds(chip);

	rc = fg_set_auto_recharge(chip);