drivers/power/supply/lt3651-charger.c

Source file repositories/reference/linux-study-clean/drivers/power/supply/lt3651-charger.c

File Facts

System
Linux kernel
Corpus path
drivers/power/supply/lt3651-charger.c
Extension
.c
Size
5998 bytes
Lines
208
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 lt3651_charger {
	struct power_supply *charger;
	struct power_supply_desc charger_desc;
	struct gpio_desc *acpr_gpio;
	struct gpio_desc *fault_gpio;
	struct gpio_desc *chrg_gpio;
};

static irqreturn_t lt3651_charger_irq(int irq, void *devid)
{
	struct power_supply *charger = devid;

	power_supply_changed(charger);

	return IRQ_HANDLED;
}

static inline struct lt3651_charger *psy_to_lt3651_charger(
	struct power_supply *psy)
{
	return power_supply_get_drvdata(psy);
}

static int lt3651_charger_get_property(struct power_supply *psy,
		enum power_supply_property psp, union power_supply_propval *val)
{
	struct lt3651_charger *lt3651_charger = psy_to_lt3651_charger(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (!lt3651_charger->chrg_gpio) {
			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
			break;
		}
		if (gpiod_get_value(lt3651_charger->chrg_gpio))
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = gpiod_get_value(lt3651_charger->acpr_gpio);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		if (!lt3651_charger->fault_gpio) {
			val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
			break;
		}
		if (!gpiod_get_value(lt3651_charger->fault_gpio)) {
			val->intval = POWER_SUPPLY_HEALTH_GOOD;
			break;
		}
		/*
		 * If the fault pin is active, the chrg pin explains the type
		 * of failure.
		 */
		if (!lt3651_charger->chrg_gpio) {
			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
			break;
		}
		val->intval = gpiod_get_value(lt3651_charger->chrg_gpio) ?
				POWER_SUPPLY_HEALTH_OVERHEAT :
				POWER_SUPPLY_HEALTH_DEAD;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static enum power_supply_property lt3651_charger_properties[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_HEALTH,
};

static int lt3651_charger_probe(struct platform_device *pdev)
{
	struct power_supply_config psy_cfg = {};
	struct lt3651_charger *lt3651_charger;
	struct power_supply_desc *charger_desc;
	int ret;

	lt3651_charger = devm_kzalloc(&pdev->dev, sizeof(*lt3651_charger),
					GFP_KERNEL);
	if (!lt3651_charger)
		return -ENOMEM;

	lt3651_charger->acpr_gpio = devm_gpiod_get(&pdev->dev,
					"lltc,acpr", GPIOD_IN);

Annotation

Implementation Notes