drivers/iio/gyro/adis16130.c

Source file repositories/reference/linux-study-clean/drivers/iio/gyro/adis16130.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/gyro/adis16130.c
Extension
.c
Size
4556 bytes
Lines
176
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 adis16130_state {
	struct spi_device		*us;
	struct mutex			buf_lock;
	u8				buf[4] __aligned(IIO_DMA_MINALIGN);
};

static int adis16130_spi_read(struct iio_dev *indio_dev, u8 reg_addr, u32 *val)
{
	int ret;
	struct adis16130_state *st = iio_priv(indio_dev);
	struct spi_transfer xfer = {
		.tx_buf = st->buf,
		.rx_buf = st->buf,
		.len = 4,
	};

	mutex_lock(&st->buf_lock);

	st->buf[0] = ADIS16130_CON_RD | reg_addr;
	st->buf[1] = st->buf[2] = st->buf[3] = 0;

	ret = spi_sync_transfer(st->us, &xfer, 1);
	if (ret == 0)
		*val = get_unaligned_be24(&st->buf[1]);
	mutex_unlock(&st->buf_lock);

	return ret;
}

static int adis16130_read_raw(struct iio_dev *indio_dev,
			      struct iio_chan_spec const *chan,
			      int *val, int *val2,
			      long mask)
{
	int ret;
	u32 temp;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		/* Take the iio_dev status lock */
		ret = adis16130_spi_read(indio_dev, chan->address, &temp);
		if (ret)
			return ret;
		*val = temp;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_ANGL_VEL:
			/* 0 degree = 838860, 250 degree = 14260608 */
			*val = 250;
			*val2 = 336440817; /* RAD_TO_DEGREE(14260608 - 8388608) */
			return IIO_VAL_FRACTIONAL;
		case IIO_TEMP:
			/* 0C = 8036283, 105C = 9516048 */
			*val = 105000;
			*val2 = 9516048 - 8036283;
			return IIO_VAL_FRACTIONAL;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_OFFSET:
		switch (chan->type) {
		case IIO_ANGL_VEL:
			*val = -8388608;
			return IIO_VAL_INT;
		case IIO_TEMP:
			*val = -8036283;
			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
	}

	return -EINVAL;
}

static const struct iio_chan_spec adis16130_channels[] = {
	{
		.type = IIO_ANGL_VEL,
		.modified = 1,
		.channel2 = IIO_MOD_Z,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
			BIT(IIO_CHAN_INFO_SCALE) |
			BIT(IIO_CHAN_INFO_OFFSET),
		.address = ADIS16130_RATEDATA,
	}, {
		.type = IIO_TEMP,
		.indexed = 1,
		.channel = 0,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |

Annotation

Implementation Notes