iio_read_max_channel_raw
ret = iio_read_max_channel_raw(env->dac, &env->dac_max);
ret = iio_read_max_channel_raw(dac->dpot, &max);
EXPORT_SYMBOL_GPL(iio_read_max_channel_raw);
ret = iio_read_max_channel_raw(bat->channel, &max_raw);
int iio_read_max_channel_raw(struct iio_channel *chan, int *val);
ret = iio_read_max_channel_raw(chan->iio_chan, &chan->max);