grange[0] = g_variant_new_uint64(MIN_NUM_SAMPLES);
grange[1] = g_variant_new_uint64(devc->max_samples / num_channels);
*data = g_variant_new_tuple(grange, 2);
grange[0] = g_variant_new_uint64(MIN_NUM_SAMPLES);
grange[1] = g_variant_new_uint64(devc->max_samples / num_channels);
*data = g_variant_new_tuple(grange, 2);