iio_read_avail_channel_attribute
EXPORT_SYMBOL_GPL(iio_read_avail_channel_attribute);
ret = iio_read_avail_channel_attribute(chan, vals, &type, length,
ret = iio_read_avail_channel_attribute(bat->channel, &scale_raw,
int iio_read_avail_channel_attribute(struct iio_channel *chan,