drivers/iio/accel/dmard06.c

Source file repositories/reference/linux-study-clean/drivers/iio/accel/dmard06.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/accel/dmard06.c
Extension
.c
Size
5581 bytes
Lines
231
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 dmard06_data {
	struct i2c_client *client;
	u8 chip_id;
};

static const struct iio_chan_spec dmard06_channels[] = {
	DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG),
	DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG),
	DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG),
	DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG),
};

static int dmard06_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	struct dmard06_data *dmard06 = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = i2c_smbus_read_byte_data(dmard06->client,
					       chan->address);
		if (ret < 0) {
			dev_err(&dmard06->client->dev,
				"Error reading data: %d\n", ret);
			return ret;
		}

		*val = sign_extend32(ret, DMARD06_SIGN_BIT);

		if (dmard06->chip_id == DMARD06_CHIP_ID)
			*val = *val >> 1;

		switch (chan->type) {
		case IIO_ACCEL:
			return IIO_VAL_INT;
		case IIO_TEMP:
			if (dmard06->chip_id != DMARD06_CHIP_ID)
				*val = *val / 2;
			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_OFFSET:
		switch (chan->type) {
		case IIO_TEMP:
			*val = DMARD06_TEMP_CENTER_VAL;
			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_ACCEL:
			*val = 0;
			if (dmard06->chip_id == DMARD06_CHIP_ID)
				*val2 = DMARD06_AXIS_SCALE_VAL;
			else
				*val2 = DMARD05_AXIS_SCALE_VAL;
			return IIO_VAL_INT_PLUS_MICRO;
		default:
			return -EINVAL;
		}
	default:
		return -EINVAL;
	}
}

static const struct iio_info dmard06_info = {
	.read_raw	= dmard06_read_raw,
};

static int dmard06_probe(struct i2c_client *client)
{
	int ret;
	struct iio_dev *indio_dev;
	struct dmard06_data *dmard06;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "I2C check functionality failed\n");
		return -ENXIO;
	}

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06));
	if (!indio_dev)
		return -ENOMEM;

	dmard06 = iio_priv(indio_dev);
	dmard06->client = client;

Annotation

Implementation Notes