  We investigate the Wigner distributions for $u$ and $d$ quarks in a
light-front quark-diquark model of a proton to unravel the spatial and spin
structure. The light-front wave functions are modeled from the soft-wall
AdS/QCD prediction. We consider the contributions from both the scalar and the
axial vector diquarks. The Wigner distributions for unpolarized, longitudinally
polarized, and transversely polarized protons are presented in the transverse
momentum plane as well as in the transverse impact parameter plane. The Wigner
distributions satisfy a Soffer-bound-type inequality. We also evaluate all the
leading twist GTMDs and show their scale evolution. The spin-spin correlations
between the quark and the proton are investigated
