drivers/power/supply/max77693_charger.c

Source file repositories/reference/linux-study-clean/drivers/power/supply/max77693_charger.c

File Facts

System
Linux kernel
Corpus path
drivers/power/supply/max77693_charger.c
Extension
.c
Size
19705 bytes
Lines
809
Domain
Driver Families
Bucket
drivers/power
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct max77693_charger {
	struct device		*dev;
	struct max77693_dev	*max77693;
	struct power_supply	*charger;

	u32 constant_volt;
	u32 min_system_volt;
	u32 thermal_regulation_temp;
	u32 batttery_overcurrent;
	u32 charge_input_threshold_volt;
};

static int max77693_get_charger_state(struct regmap *regmap, int *val)
{
	int ret;
	unsigned int data;

	ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data);
	if (ret < 0)
		return ret;

	data &= CHG_DETAILS_01_CHG_MASK;
	data >>= CHG_DETAILS_01_CHG_SHIFT;

	switch (data) {
	case MAX77693_CHARGING_PREQUALIFICATION:
	case MAX77693_CHARGING_FAST_CONST_CURRENT:
	case MAX77693_CHARGING_FAST_CONST_VOLTAGE:
	case MAX77693_CHARGING_TOP_OFF:
	/* In high temp the charging current is reduced, but still charging */
	case MAX77693_CHARGING_HIGH_TEMP:
		*val = POWER_SUPPLY_STATUS_CHARGING;
		break;
	case MAX77693_CHARGING_DONE:
		*val = POWER_SUPPLY_STATUS_FULL;
		break;
	case MAX77693_CHARGING_TIMER_EXPIRED:
	case MAX77693_CHARGING_THERMISTOR_SUSPEND:
		*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;
	case MAX77693_CHARGING_OFF:
	case MAX77693_CHARGING_OVER_TEMP:
	case MAX77693_CHARGING_WATCHDOG_EXPIRED:
		*val = POWER_SUPPLY_STATUS_DISCHARGING;
		break;
	case MAX77693_CHARGING_RESERVED:
	default:
		*val = POWER_SUPPLY_STATUS_UNKNOWN;
	}

	return 0;
}

static int max77693_get_charge_type(struct regmap *regmap, int *val)
{
	int ret;
	unsigned int data;

	ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data);
	if (ret < 0)
		return ret;

	data &= CHG_DETAILS_01_CHG_MASK;
	data >>= CHG_DETAILS_01_CHG_SHIFT;

	switch (data) {
	case MAX77693_CHARGING_PREQUALIFICATION:
	/*
	 * Top-off: trickle or fast? In top-off the current varies between
	 * 100 and 250 mA. It is higher than prequalification current.
	 */
	case MAX77693_CHARGING_TOP_OFF:
		*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
		break;
	case MAX77693_CHARGING_FAST_CONST_CURRENT:
	case MAX77693_CHARGING_FAST_CONST_VOLTAGE:
	/* In high temp the charging current is reduced, but still charging */
	case MAX77693_CHARGING_HIGH_TEMP:
		*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
		break;
	case MAX77693_CHARGING_DONE:
	case MAX77693_CHARGING_TIMER_EXPIRED:
	case MAX77693_CHARGING_THERMISTOR_SUSPEND:
	case MAX77693_CHARGING_OFF:
	case MAX77693_CHARGING_OVER_TEMP:
	case MAX77693_CHARGING_WATCHDOG_EXPIRED:
		*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
		break;
	case MAX77693_CHARGING_RESERVED:
	default:

Annotation

Implementation Notes