HW consumer

An IIO device can be directly connected to another device in hardware. In this case the buffers between IIO provider and IIO consumer are handled by hardware. The Industrial I/O HW consumer offers a way to bond these IIO devices without software buffer for data. The implementation can be found under drivers/iio/buffer/hw-consumer.c

  • struct iio_hw_consumer — Hardware consumer structure

  • iio_hw_consumer_alloc() — Allocate IIO hardware consumer

  • iio_hw_consumer_free() — Free IIO hardware consumer

  • iio_hw_consumer_enable() — Enable IIO hardware consumer

  • iio_hw_consumer_disable() — Disable IIO hardware consumer

HW consumer setup

As standard IIO device the implementation is based on IIO provider/consumer. A typical IIO HW consumer setup looks like this:

static struct iio_hw_consumer *hwc;

static const struct iio_info adc_info = {
        .read_raw = adc_read_raw,
};

static int adc_read_raw(struct iio_dev *indio_dev,
                        struct iio_chan_spec const *chan, int *val,
                        int *val2, long mask)
{
        ret = iio_hw_consumer_enable(hwc);

        /* Acquire data */

        ret = iio_hw_consumer_disable(hwc);
}

static int adc_probe(struct platform_device *pdev)
{
        hwc = devm_iio_hw_consumer_alloc(&iio->dev);
}

More details

Error

kernel-doc missing