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Commit eed97842 authored by Xiaozhe Shi's avatar Xiaozhe Shi
Browse files

power: qpnp-fg: configure irq_volt_empty in the fuel gauge 



The empty soc interrupt in the fuel gauge is the last line of defense
for the fuel gauge to report 0% before the phone runs out of battery
power. Allow the threshold at which this interrupt triggers at to be
configured via the device tree in the fuel gauge driver as
qcom,irq-volt-empty-mv.

CRs-Fixed: 758265
Change-Id: I6f6fa07e3cca1119d7ff6e6cab9e20100e0eea80
Signed-off-by: default avatarXiaozhe Shi <xiaozhes@codeaurora.org>
parent bbf9c0b8

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

+8 −0
Original line number Diff line number Diff line
@@ -57,6 +57,14 @@ Parent node optional properties: 
					property is in milliamps and should be

					positive (e.g. 100mA to terminate at

					-100mA).

- qcom,irq-volt-empty-mv:		The voltage threshold that the empty

					soc interrupt will be triggered. When

					the empty soc interrupt fires, battery

					soc will be pulled to 0 and the

					userspace will be notified via the

					power supply framework. The userspace

					will read 0% soc and immediately

					shutdown.



qcom,fg-soc node required properties:

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

drivers/power/qpnp-fg.c

+20 −0
Original line number Diff line number Diff line
@@ -119,6 +119,7 @@ enum fg_mem_setting_index { 
	FG_MEM_BCL_LM_THRESHOLD,

	FG_MEM_BCL_MH_THRESHOLD,

	FG_MEM_TERM_CURRENT,

	FG_MEM_IRQ_VOLT_EMPTY,

	FG_MEM_SETTING_MAX,

};
@@ -151,6 +152,7 @@ static struct fg_mem_setting settings[FG_MEM_SETTING_MAX] = { 
	SETTING(BCL_LM_THRESHOLD, 0x47C,   2,      50),

	SETTING(BCL_MH_THRESHOLD, 0x47C,   3,      752),

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

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

};



#define DATA(_idx, _address, _offset, _length,  _value)	\
@@ -1950,6 +1952,22 @@ static void update_bcl_thresholds(struct fg_chip *chip) 
			data[lm_offset], data[mh_offset]);

}



#define VOLT_UV_TO_VOLTCMP8(volt_uv)	\

			((volt_uv - 2500000) / 9766)

static int update_irq_volt_empty(struct fg_chip *chip)

{

	u8 data;

	int volt_mv = settings[FG_MEM_IRQ_VOLT_EMPTY].value;



	data = (u8)VOLT_UV_TO_VOLTCMP8(volt_mv * 1000);



	if (fg_debug_mask & FG_STATUS)

		pr_info("voltage = %d, converted_raw = %04x\n", volt_mv, data);

	return fg_mem_write(chip, &data,

			settings[FG_MEM_IRQ_VOLT_EMPTY].address, 1,

			settings[FG_MEM_IRQ_VOLT_EMPTY].offset, 0);

}



#define CURRENT_UA_TO_ADC_RAW(cur_ua)	\

			(cur_ua * LSB_16B_DENMTR / LSB_16B_NUMRTR)

static int update_iterm(struct fg_chip *chip)
@@ -1990,6 +2008,7 @@ static int fg_of_init(struct fg_chip *chip) 
		chip->use_thermal_coefficients = true;

	}

	OF_READ_SETTING(FG_MEM_RESUME_SOC, "resume-soc", rc, 1);

	OF_READ_SETTING(FG_MEM_IRQ_VOLT_EMPTY, "irq-volt-empty-mv", rc, 1);



	/* Get the use-otp-profile property */

	chip->use_otp_profile = of_property_read_bool(
@@ -2611,6 +2630,7 @@ static int fg_hw_init(struct fg_chip *chip) 
	int rc = 0;



	update_iterm(chip);

	update_irq_volt_empty(chip);

	update_bcl_thresholds(chip);

	rc = fg_set_auto_recharge(chip);

	if (rc) {