driver-api/iio/core.rst

8 :file:`drivers/iio/industrialio-*`
11 ----------------------
13 * struct iio_dev - industrial I/O device
14 * iio_device_alloc() - allocate an :c:type:`iio_dev` from a driver
15 * iio_device_free() - free an :c:type:`iio_dev` from a driver
16 * iio_device_register() - register a device with the IIO subsystem
17 * iio_device_unregister() - unregister a device from the IIO
63   :file:`Documentation/ABI/testing/sysfs-bus-iio` file in the Linux kernel
69 struct iio_chan_spec - specification of a single channel
71 An IIO device channel is a representation of a data channel. An IIO device can
72 have one or multiple channels. For example:
74 * a thermometer sensor has one channel representing the temperature measurement.
80 An IIO channel is described by the struct iio_chan_spec.
82 have to describe its channel as follows::
91 Channel sysfs attributes exposed to userspace are specified in the form of
92 bitmasks. Depending on their shared info, attributes can be set in one of the
96   this channel
103 When there are multiple data channels per channel type we have two ways to
109   channel such as its direction or spectral response. For example, a light
110   sensor can have two channels, one for infrared light and one for both
113   channel is simply another instance with an index specified by the **.channel**
116 Here is how we can make use of the channel's modifiers::
140 This channel's definition will generate two separate sysfs files for raw data
146 one file for processed data:
150 and one shared sysfs file for sampling frequency:
154 Here is how we can make use of the channel's indexing::
160 		   .channel = 0,
166                    .channel = 1,
174   voltage measurement for channel 0.
176   voltage measurement for channel 1.
180 .. kernel-doc:: include/linux/iio/iio.h
181 .. kernel-doc:: drivers/iio/industrialio-core.c