Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: 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>
authored by
Dimitri Fedrau
and committed by
Sebastian Reichel
4ad5c726
252e6671
+47
+47
drivers/power/supply/max1720x_battery.c
+47
drivers/power/supply/max1720x_battery.c
···
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/* ModelGauge m5 */
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#define MAX172XX_STATUS 0x00 /* Status */
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#define MAX172XX_STATUS_BAT_ABSENT BIT(3) /* Battery absent */
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#define MAX172XX_STATUS_IMX BIT(6) /* Maximum Current Alert Threshold Exceeded */
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#define MAX172XX_STATUS_VMN BIT(8) /* Minimum Voltage Alert Threshold Exceeded */
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#define MAX172XX_STATUS_TMN BIT(9) /* Minimum Temperature Alert Threshold Exceeded */
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#define MAX172XX_STATUS_VMX BIT(12) /* Maximum Voltage Alert Threshold Exceeded */
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#define MAX172XX_STATUS_TMX BIT(13) /* Maximum Temperature Alert Threshold Exceeded */
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#define MAX172XX_REPCAP 0x05 /* Average capacity */
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#define MAX172XX_REPSOC 0x06 /* Percentage of charge */
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#define MAX172XX_TEMP 0x08 /* Temperature */
···
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};
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static const enum power_supply_property max1720x_battery_props[] = {
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
···
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return val * 156252;
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}
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static int max172xx_battery_health(struct max1720x_device_info *info,
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unsigned int *health)
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{
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unsigned int status;
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int ret;
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ret = regmap_read(info->regmap, MAX172XX_STATUS, &status);
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if (ret < 0)
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return ret;
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if (status & MAX172XX_STATUS_VMN)
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*health = POWER_SUPPLY_HEALTH_DEAD;
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else if (status & MAX172XX_STATUS_VMX)
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*health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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else if (status & MAX172XX_STATUS_TMN)
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*health = POWER_SUPPLY_HEALTH_COLD;
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else if (status & MAX172XX_STATUS_TMX)
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*health = POWER_SUPPLY_HEALTH_OVERHEAT;
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else if (status & MAX172XX_STATUS_IMX)
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*health = POWER_SUPPLY_HEALTH_OVERCURRENT;
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else
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*health = POWER_SUPPLY_HEALTH_GOOD;
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/* Clear events which are not self-clearing to detect next events */
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if (status > 0 && status != MAX172XX_STATUS_IMX) {
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ret = regmap_set_bits(info->regmap, MAX172XX_STATUS,
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MAX172XX_STATUS_VMN |
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MAX172XX_STATUS_VMX |
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MAX172XX_STATUS_TMN |
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MAX172XX_STATUS_TMX);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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static int max1720x_battery_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
···
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_HEALTH:
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ret = max172xx_battery_health(info, ®_val);
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val->intval = reg_val;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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/*
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* POWER_SUPPLY_PROP_PRESENT will always readable via