1===========
2HW consumer
3===========
4An IIO device can be directly connected to another device in hardware. in this
5case the buffers between IIO provider and IIO consumer are handled by hardware.
6The Industrial I/O HW consumer offers a way to bond these IIO devices without
7software buffer for data. The implementation can be found under
8:file:`drivers/iio/buffer/hw-consumer.c`
9
10
11* struct :c:type:`iio_hw_consumer` — Hardware consumer structure
12* :c:func:`iio_hw_consumer_alloc` — Allocate IIO hardware consumer
13* :c:func:`iio_hw_consumer_free` — Free IIO hardware consumer
14* :c:func:`iio_hw_consumer_enable` — Enable IIO hardware consumer
15* :c:func:`iio_hw_consumer_disable` — Disable IIO hardware consumer
16
17
18HW consumer setup
19=================
20
21As standard IIO device the implementation is based on IIO provider/consumer.
22A typical IIO HW consumer setup looks like this::
23
24	static struct iio_hw_consumer *hwc;
25
26	static const struct iio_info adc_info = {
27		.read_raw = adc_read_raw,
28	};
29
30	static int adc_read_raw(struct iio_dev *indio_dev,
31				struct iio_chan_spec const *chan, int *val,
32				int *val2, long mask)
33	{
34		ret = iio_hw_consumer_enable(hwc);
35
36		/* Acquire data */
37
38		ret = iio_hw_consumer_disable(hwc);
39	}
40
41	static int adc_probe(struct platform_device *pdev)
42	{
43		hwc = devm_iio_hw_consumer_alloc(&iio->dev);
44	}
45
46More details
47============
48.. kernel-doc:: include/linux/iio/hw-consumer.h
49.. kernel-doc:: drivers/iio/buffer/industrialio-hw-consumer.c
50   :export:
51
52