drivers/iio/adc/max11205.c

Source file repositories/reference/linux-study-clean/drivers/iio/adc/max11205.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/adc/max11205.c
Extension
.c
Size
4336 bytes
Lines
181
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 max11205_chip_info {
	unsigned int	out_data_rate;
	const char	*name;
};

struct max11205_state {
	const struct max11205_chip_info	*chip_info;
	struct regulator		*vref;
	struct ad_sigma_delta		sd;
};

static const struct ad_sigma_delta_info max11205_sigma_delta_info = {
	.has_registers = false,
};

static int max11205_read_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int *val, int *val2, long mask)
{
	struct max11205_state *st = iio_priv(indio_dev);
	int reg_mv;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		return ad_sigma_delta_single_conversion(indio_dev, chan, val);
	case IIO_CHAN_INFO_SCALE:
		reg_mv = regulator_get_voltage(st->vref);
		if (reg_mv < 0)
			return reg_mv;
		reg_mv /= 1000;
		*val = reg_mv;
		*val2 = MAX11205_BIT_SCALE;
		return IIO_VAL_FRACTIONAL_LOG2;
	case IIO_CHAN_INFO_SAMP_FREQ:
		*val = st->chip_info->out_data_rate;
		return IIO_VAL_INT;
	default:
		return -EINVAL;
	}
}

static const struct iio_info max11205_iio_info = {
	.read_raw = max11205_read_raw,
	.validate_trigger = ad_sd_validate_trigger,
};

static const struct iio_chan_spec max11205_channels[] = {
	{
		.type = IIO_VOLTAGE,
		.indexed = 1,
		.scan_type = {
			.sign = 's',
			.realbits = 16,
			.storagebits = 16,
			.endianness = IIO_BE,
		},
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
				      BIT(IIO_CHAN_INFO_SAMP_FREQ) |
				      BIT(IIO_CHAN_INFO_SCALE),
	},
};

static const struct max11205_chip_info max11205_chip_info[] = {
	[TYPE_MAX11205A] = {
		.out_data_rate = MAX11205A_OUT_DATA_RATE,
		.name = "max11205a",
	},
	[TYPE_MAX11205B] = {
		.out_data_rate = MAX11205B_OUT_DATA_RATE,
		.name = "max11205b",
	},
};

static void max11205_reg_disable(void *reg)
{
	regulator_disable(reg);
}

static int max11205_probe(struct spi_device *spi)
{
	struct max11205_state *st;
	struct iio_dev *indio_dev;
	int ret;

	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
	if (!indio_dev)
		return -ENOMEM;

	st = iio_priv(indio_dev);

Annotation

Implementation Notes