Commit 4ad5c726 authored by Dimitri Fedrau's avatar Dimitri Fedrau Committed by Sebastian Reichel
Browse files

power: supply: max1720x: add health property 



Add health property, which checks that temperature, voltage and current are
within limits for the battery. Limits can be programmed in non-volatile
memory.

Signed-off-by: default avatarDimitri Fedrau <dimitri.fedrau@liebherr.com>
Link: https://lore.kernel.org/r/20250204-max1720x_health-v1-1-97ebbe4a0bc5@liebherr.com


Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent 252e6671

drivers/power/supply/max1720x_battery.c

+47 −0
Original line number Diff line number Diff line
@@ -29,6 +29,11 @@ 
/* ModelGauge m5 */

#define MAX172XX_STATUS			0x00	/* Status */

#define MAX172XX_STATUS_BAT_ABSENT	BIT(3)	/* Battery absent */

#define MAX172XX_STATUS_IMX		BIT(6)	/* Maximum Current Alert Threshold Exceeded */

#define MAX172XX_STATUS_VMN		BIT(8)	/* Minimum Voltage Alert Threshold Exceeded */

#define MAX172XX_STATUS_TMN		BIT(9)	/* Minimum Temperature Alert Threshold Exceeded */

#define MAX172XX_STATUS_VMX		BIT(12)	/* Maximum Voltage Alert Threshold Exceeded */

#define MAX172XX_STATUS_TMX		BIT(13)	/* Maximum Temperature Alert Threshold Exceeded */

#define MAX172XX_REPCAP			0x05	/* Average capacity */

#define MAX172XX_REPSOC			0x06	/* Percentage of charge */

#define MAX172XX_TEMP			0x08	/* Temperature */
@@ -250,6 +255,7 @@ static const struct nvmem_cell_info max1720x_nvmem_cells[] = { 
};



static const enum power_supply_property max1720x_battery_props[] = {

	POWER_SUPPLY_PROP_HEALTH,

	POWER_SUPPLY_PROP_PRESENT,

	POWER_SUPPLY_PROP_CAPACITY,

	POWER_SUPPLY_PROP_VOLTAGE_NOW,
@@ -314,6 +320,43 @@ static int max172xx_current_to_voltage(unsigned int reg) 
	return val * 156252;

}



static int max172xx_battery_health(struct max1720x_device_info *info,

				   unsigned int *health)

{

	unsigned int status;

	int ret;



	ret = regmap_read(info->regmap, MAX172XX_STATUS, &status);

	if (ret < 0)

		return ret;



	if (status & MAX172XX_STATUS_VMN)

		*health = POWER_SUPPLY_HEALTH_DEAD;

	else if (status & MAX172XX_STATUS_VMX)

		*health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;

	else if (status & MAX172XX_STATUS_TMN)

		*health = POWER_SUPPLY_HEALTH_COLD;

	else if (status & MAX172XX_STATUS_TMX)

		*health = POWER_SUPPLY_HEALTH_OVERHEAT;

	else if (status & MAX172XX_STATUS_IMX)

		*health = POWER_SUPPLY_HEALTH_OVERCURRENT;

	else

		*health = POWER_SUPPLY_HEALTH_GOOD;



	/* Clear events which are not self-clearing to detect next events */

	if (status > 0 && status != MAX172XX_STATUS_IMX) {

		ret = regmap_set_bits(info->regmap, MAX172XX_STATUS,

				      MAX172XX_STATUS_VMN |

				      MAX172XX_STATUS_VMX |

				      MAX172XX_STATUS_TMN |

				      MAX172XX_STATUS_TMX);

		if (ret < 0)

			return ret;

	}



	return 0;

}



static int max1720x_battery_get_property(struct power_supply *psy,

					 enum power_supply_property psp,

					 union power_supply_propval *val)
@@ -323,6 +366,10 @@ static int max1720x_battery_get_property(struct power_supply *psy, 
	int ret = 0;



	switch (psp) {

	case POWER_SUPPLY_PROP_HEALTH:

		ret = max172xx_battery_health(info, &reg_val);

		val->intval = reg_val;

		break;

	case POWER_SUPPLY_PROP_PRESENT:

		/*

		 * POWER_SUPPLY_PROP_PRESENT will always readable via