drivers/power/supply/lp8788-charger.c

Source file repositories/reference/linux-study-clean/drivers/power/supply/lp8788-charger.c

File Facts

System
Linux kernel
Corpus path
drivers/power/supply/lp8788-charger.c
Extension
.c
Size
18003 bytes
Lines
730
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 lp8788_chg_irq {
	enum lp8788_int_id which;
	int virq;
};

/*
 * struct lp8788_charger
 * @lp           : used for accessing the registers of mfd lp8788 device
 * @charger      : power supply driver for the battery charger
 * @battery      : power supply driver for the battery
 * @charger_work : work queue for charger input interrupts
 * @chan         : iio channels for getting adc values
 *                 eg) battery voltage, capacity and temperature
 * @irqs         : charger dedicated interrupts
 * @num_irqs     : total numbers of charger interrupts
 * @pdata        : charger platform specific data
 */
struct lp8788_charger {
	struct lp8788 *lp;
	struct power_supply *charger;
	struct power_supply *battery;
	struct work_struct charger_work;
	struct iio_channel *chan[LP8788_NUM_CHG_ADC];
	struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
	int num_irqs;
	struct lp8788_charger_platform_data *pdata;
};

static char *battery_supplied_to[] = {
	LP8788_BATTERY_NAME,
};

static enum power_supply_property lp8788_charger_prop[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_CURRENT_MAX,
};

static enum power_supply_property lp8788_battery_prop[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_TEMP,
};

static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
{
	u8 data;

	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
	data &= LP8788_CHG_INPUT_STATE_M;

	return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
}

static int lp8788_charger_get_property(struct power_supply *psy,
					enum power_supply_property psp,
					union power_supply_propval *val)
{
	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent);
	u8 read;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = lp8788_is_charger_detected(pchg);
		break;
	case POWER_SUPPLY_PROP_CURRENT_MAX:
		lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
		val->intval = LP8788_ISEL_STEP *
				(min_t(int, read, LP8788_ISEL_MAX) + 1);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int lp8788_get_battery_status(struct lp8788_charger *pchg,
				union power_supply_propval *val)
{
	enum lp8788_charging_state state;
	u8 data;
	int ret;

	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
	if (ret)

Annotation

Implementation Notes