IIO data structures

An IIO device is represented in the kernel as an instance of struct iio_dev, and described by a struct iio_info structure. All of the important IIO structures are defined in include/linux/iio/iio.h.

iio_dev structure

This structure represents the IIO device, describing the device and the driver. It tells us about:

• How many channels are available on the device
• What modes can the device operate in: one-shot, triggered buffer
• What hooks are available for this driver

struct iio_dev { 
   [...] 
   int modes; 
   int currentmode; 
   struct device dev; 
 
   struct iio_buffer *buffer; 
   int scan_bytes; 
 
   const unsigned long *available_scan_masks; 
   const unsigned long *active_scan_mask; 
   bool scan_timestamp; 
   struct iio_trigger *trig; 
   struct iio_poll_func *pollfunc; 
 
   struct iio_chan_spec const *channels; 
   int num_channels; 
   const char *name; 
   const struct iio_info *info; 
   const struct iio_buffer_setup_ops *setup_ops; 
   struct cdev chrdev; 
...