drivers/power/supply/twl4030_madc_battery.c

Source file repositories/reference/linux-study-clean/drivers/power/supply/twl4030_madc_battery.c

File Facts

System
Linux kernel
Corpus path
drivers/power/supply/twl4030_madc_battery.c
Extension
.c
Size
6775 bytes
Lines
238
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 twl4030_madc_battery {
	struct power_supply *psy;
	struct twl4030_madc_bat_platform_data *pdata;
	struct iio_channel *channel_temp;
	struct iio_channel *channel_ichg;
	struct iio_channel *channel_vbat;
};

static enum power_supply_property twl4030_madc_bat_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
};

static int madc_read(struct iio_channel *channel)
{
	int val, err;
	err = iio_read_channel_processed(channel, &val);
	if (err < 0)
		return err;

	return val;
}

static int twl4030_madc_bat_get_charging_status(struct twl4030_madc_battery *bt)
{
	return (madc_read(bt->channel_ichg) > 0) ? 1 : 0;
}

static int twl4030_madc_bat_get_voltage(struct twl4030_madc_battery *bt)
{
	return madc_read(bt->channel_vbat);
}

static int twl4030_madc_bat_get_current(struct twl4030_madc_battery *bt)
{
	return madc_read(bt->channel_ichg) * 1000;
}

static int twl4030_madc_bat_get_temp(struct twl4030_madc_battery *bt)
{
	return madc_read(bt->channel_temp) * 10;
}

static int twl4030_madc_bat_voltscale(struct twl4030_madc_battery *bat,
					int volt)
{
	struct twl4030_madc_bat_calibration *calibration;
	int i, res = 0;

	/* choose charging curve */
	if (twl4030_madc_bat_get_charging_status(bat))
		calibration = bat->pdata->charging;
	else
		calibration = bat->pdata->discharging;

	if (volt > calibration[0].voltage) {
		res = calibration[0].level;
	} else {
		for (i = 0; calibration[i+1].voltage >= 0; i++) {
			if (volt <= calibration[i].voltage &&
					volt >= calibration[i+1].voltage) {
				/* interval found - interpolate within range */
				res = calibration[i].level -
					((calibration[i].voltage - volt) *
					(calibration[i].level -
					calibration[i+1].level)) /
					(calibration[i].voltage -
					calibration[i+1].voltage);
				break;
			}
		}
	}
	return res;
}

static int twl4030_madc_bat_get_property(struct power_supply *psy,
					enum power_supply_property psp,
					union power_supply_propval *val)
{
	struct twl4030_madc_battery *bat = power_supply_get_drvdata(psy);

	switch (psp) {

Annotation

Implementation Notes