drivers/power/supply/max8971_charger.c

Source file repositories/reference/linux-study-clean/drivers/power/supply/max8971_charger.c

File Facts

System
Linux kernel
Corpus path
drivers/power/supply/max8971_charger.c
Extension
.c
Size
19964 bytes
Lines
753
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 max8971_data {
	struct device *dev;
	struct power_supply *psy_mains;

	struct extcon_dev *edev;
	struct notifier_block extcon_nb;
	struct delayed_work extcon_work;

	struct regmap *regmap;
	struct regmap_field *rfield[MAX8971_N_REGMAP_FIELDS];

	enum power_supply_usb_type usb_type;

	u32 fchgt;
	u32 tofft;
	u32 toffs;

	bool present;
};

static int max8971_get_status(struct max8971_data *priv, int *val)
{
	u32 regval;
	int err;

	err = regmap_field_read(priv->rfield[CHG_DTLS], &regval);
	if (err)
		return err;

	switch (regval) {
	case MAX8971_CHARGING_DEAD_BATTERY:
	case MAX8971_CHARGING_PREQUALIFICATION:
	case MAX8971_CHARGING_FAST_CONST_CURRENT:
	case MAX8971_CHARGING_FAST_CONST_VOLTAGE:
	case MAX8971_CHARGING_TOP_OFF:
	case MAX8971_CHARGING_THERMAL_LOOP:
		*val = POWER_SUPPLY_STATUS_CHARGING;
		break;
	case MAX8971_CHARGING_DONE:
		*val = POWER_SUPPLY_STATUS_FULL;
		break;
	case MAX8971_CHARGING_TIMER_FAULT:
		*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;
	case MAX8971_CHARGING_OFF:
	case MAX8971_CHARGING_SUSPENDED_THERMAL:
		*val = POWER_SUPPLY_STATUS_DISCHARGING;
		break;
	default:
		*val = POWER_SUPPLY_STATUS_UNKNOWN;
	}

	return 0;
}

static int max8971_get_charge_type(struct max8971_data *priv, int *val)
{
	u32 regval;
	int err;

	err = regmap_field_read(priv->rfield[CHG_DTLS], &regval);
	if (err)
		return err;

	switch (regval) {
	case MAX8971_CHARGING_DEAD_BATTERY:
	case MAX8971_CHARGING_PREQUALIFICATION:
		*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
		break;
	case MAX8971_CHARGING_FAST_CONST_CURRENT:
	case MAX8971_CHARGING_FAST_CONST_VOLTAGE:
		*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
		break;
	case MAX8971_CHARGING_TOP_OFF:
	case MAX8971_CHARGING_THERMAL_LOOP:
		*val = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
		break;
	case MAX8971_CHARGING_DONE:
	case MAX8971_CHARGING_TIMER_FAULT:
	case MAX8971_CHARGING_SUSPENDED_THERMAL:
	case MAX8971_CHARGING_OFF:
		*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
		break;
	default:
		*val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
	}

	return 0;
}

Annotation

Implementation Notes