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