Here are the data structures with brief descriptions:

cmd
cmd_state
command
controller_state
demod_state
dongle_info_t
dongle_state
e4k_pll_params
e4k_state
gain_comb
llist
option
output_state
pll_settings
r82xx_config
r82xx_freq_range
r82xx_priv
reg_field
reg_field_ops
rtlsdr_config
rtlsdr_dev
rtlsdr_dongle
rtlsdr_tuner_iface
strbuf
tuning_state