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power: supply: max1720x: add health property

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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: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
Link: https://lore.kernel.org/r/20250204-max1720x_health-v1-1-97ebbe4a0bc5@liebherr.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Dimitri Fedrau 2025-02-04 14:10:31 +01:00 committed by Sebastian Reichel
parent 252e6671d6
commit 4ad5c72670
1 changed files with 47 additions and 0 deletions
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47
drivers/power/supply/max1720x_battery.c
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@ -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