Linux Device Drivers Development

iio_info structure

The struct iio_info structure is used to declare the hooks used by the IIO core in order to read/write channel/attribute values:

struct iio_info { 
   struct module *driver_module; 
   const struct attribute_group *attrs; 
 
   int (*read_raw)(struct iio_dev *indio_dev, 
               struct iio_chan_spec const *chan, 
               int *val, int *val2, long mask); 
 
   int (*write_raw)(struct iio_dev *indio_dev, 
                struct iio_chan_spec const *chan, 
                int val, int val2, long mask); 
    [...] 
}; 

Fields that we are not interested in have been removed:

• driver_module: This is the module structure used to ensure correct ownership of chrdevs, usually set to THIS_MODULE.
• attrs: This represents the device's attributes.
• read_raw: This is the callback run when the user reads a device's  ...