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 consumeriio_hw_consumer_free()
— Free IIO hardware consumeriio_hw_consumer_enable()
— Enable IIO hardware consumeriio_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);
}