int (*probe_channels) (struct sr_dev_inst *sdi, struct sr_scpi_hw_info *hwinfo,
struct channel_spec **channels, unsigned int *num_channels,
struct channel_group_spec **channel_groups, unsigned int *num_channel_groups);
int (*probe_channels) (struct sr_dev_inst *sdi, struct sr_scpi_hw_info *hwinfo,
struct channel_spec **channels, unsigned int *num_channels,
struct channel_group_spec **channel_groups, unsigned int *num_channel_groups);