drivers/iio/adc/mp2629_adc.c

Source file repositories/reference/linux-study-clean/drivers/iio/adc/mp2629_adc.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/adc/mp2629_adc.c
Extension
.c
Size
4989 bytes
Lines
205
Domain
Driver Families
Bucket
drivers/iio
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 mp2629_adc {
	struct regmap *regmap;
	struct device *dev;
};

static const struct iio_chan_spec mp2629_channels[] = {
	MP2629_ADC_CHAN(BATT_VOLT, IIO_VOLTAGE),
	MP2629_ADC_CHAN(SYSTEM_VOLT, IIO_VOLTAGE),
	MP2629_ADC_CHAN(INPUT_VOLT, IIO_VOLTAGE),
	MP2629_ADC_CHAN(BATT_CURRENT, IIO_CURRENT),
	MP2629_ADC_CHAN(INPUT_CURRENT, IIO_CURRENT)
};

static const struct iio_map mp2629_adc_maps[] = {
	MP2629_MAP(BATT_VOLT, "batt-volt"),
	MP2629_MAP(SYSTEM_VOLT, "system-volt"),
	MP2629_MAP(INPUT_VOLT, "input-volt"),
	MP2629_MAP(BATT_CURRENT, "batt-current"),
	MP2629_MAP(INPUT_CURRENT, "input-current"),
	{ }
};

static int mp2629_read_raw(struct iio_dev *indio_dev,
			struct iio_chan_spec const *chan,
			int *val, int *val2, long mask)
{
	struct mp2629_adc *info = iio_priv(indio_dev);
	unsigned int rval;
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = regmap_read(info->regmap, chan->address, &rval);
		if (ret)
			return ret;

		if (chan->channel == MP2629_INPUT_VOLT)
			rval &= GENMASK(6, 0);
		*val = rval;
		return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE:
		switch (chan->channel) {
		case MP2629_BATT_VOLT:
		case MP2629_SYSTEM_VOLT:
			*val = 20;
			return IIO_VAL_INT;

		case MP2629_INPUT_VOLT:
			*val = 60;
			return IIO_VAL_INT;

		case MP2629_BATT_CURRENT:
			*val = 175;
			*val2 = 10;
			return IIO_VAL_FRACTIONAL;

		case MP2629_INPUT_CURRENT:
			*val = 133;
			*val2 = 10;
			return IIO_VAL_FRACTIONAL;

		default:
			return -EINVAL;
		}

	default:
		return -EINVAL;
	}
}

static const struct iio_info mp2629_adc_info = {
	.read_raw = &mp2629_read_raw,
};

static int mp2629_adc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct mp2629_data *ddata = dev_get_drvdata(dev->parent);
	struct mp2629_adc *info;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(dev, sizeof(*info));
	if (!indio_dev)
		return -ENOMEM;

	info = iio_priv(indio_dev);
	info->regmap = ddata->regmap;
	info->dev = dev;

Annotation

Implementation Notes