1 =================
2 Triggered Buffers
3 =================
4
5 Now that we know what buffers and triggers are
6
7 IIO triggered buffer setup
8 ==========================
9
10 * :c:func:`iio_triggered_buffer_setup` — Set
11 * :c:func:`iio_triggered_buffer_cleanup` — F
12 :c:func:`iio_triggered_buffer_setup`
13 * struct iio_buffer_setup_ops — buffer setup
14
15 A typical triggered buffer setup looks like th
16
17 const struct iio_buffer_setup_ops sensor_b
18 .preenable = sensor_buffer_preenable,
19 .postenable = sensor_buffer_postenable
20 .postdisable = sensor_buffer_postdisabl
21 .predisable = sensor_buffer_predisable
22 };
23
24 irqreturn_t sensor_iio_pollfunc(int irq, v
25 {
26 pf->timestamp = iio_get_time_ns((struc
27 return IRQ_WAKE_THREAD;
28 }
29
30 irqreturn_t sensor_trigger_handler(int irq
31 {
32 u16 buf[8];
33 int i = 0;
34
35 /* read data for each active channel *
36 for_each_set_bit(bit, active_scan_mask
37 buf[i++] = sensor_get_data(bit)
38
39 iio_push_to_buffers_with_timestamp(ind
40
41 iio_trigger_notify_done(trigger);
42 return IRQ_HANDLED;
43 }
44
45 /* setup triggered buffer, usually in prob
46 iio_triggered_buffer_setup(indio_dev, sens
47 sensor_trigger_
48 sensor_buffer_s
49
50 The important things to notice here are:
51
52 * :c:type:`iio_buffer_setup_ops`, the buffer s
53 predefined points in the buffer configuratio
54 after disable). If not specified, the IIO co
55 iio_triggered_buffer_setup_ops.
56 * **sensor_iio_pollfunc**, the function that w
57 function. It should do as little processing
58 interrupt context. The most common operation
59 timestamp and for this reason one can use th
60 :c:func:`iio_pollfunc_store_time` function.
61 * **sensor_trigger_handler**, the function tha
62 the poll function. This runs in the context
63 processing takes place here. It usually read
64 stores it in the internal buffer together wi
65 top half.
66
67 More details
68 ============
69 .. kernel-doc:: drivers/iio/buffer/industriali
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