• Alexandru Ardelean's avatar
    iio: buffer: wrap all buffer attributes into iio_dev_attr · 15097c7a
    Alexandru Ardelean authored
    This change wraps all buffer attributes into iio_dev_attr objects, and
    assigns a reference to the IIO buffer they belong to.
    
    With the addition of multiple IIO buffers per one IIO device, we need a way
    to know which IIO buffer is being enabled/disabled/controlled.
    
    We know that all buffer attributes are device_attributes. So we can wrap
    them with a iio_dev_attr types. In the iio_dev_attr type, we can also hold
    a reference to an IIO buffer.
    So, we end up being able to allocate wrapped attributes for all buffer
    attributes (even the one from other drivers).
    
    The neat part with this mechanism, is that we don't need to add any extra
    cleanup, because these attributes are being added to a dynamic list that
    will get cleaned up via iio_free_chan_devattr_list().
    
    With this change, the 'buffer->scan_el_dev_attr_list' list is being renamed
    to 'buffer->buffer_attr_list', effectively merging (or finalizing the
    merge) of the buffer/ & scan_elements/ attributes internally.
    
    Accessing these new buffer attributes can now be done via
    'to_iio_dev_attr(attr)->buffer' inside the show/store handlers.
    Signed-off-by: default avatarAlexandru Ardelean <alexandru.ardelean@analog.com>
    Link: https://lore.kernel.org/r/20210215104043.91251-15-alexandru.ardelean@analog.comSigned-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
    15097c7a
industrialio-core.c 51.1 KB