Keymap entry for use in sparse keymap
struct key_entry { int type; u32 code; union {unnamed_union}; };
type
Type of the key entry (KE_KEY, KE_SW, KE_VSW, KE_END); drivers are allowed to extend the list with their own private definitions.
code
Device-specific data identifying the button/switch
{unnamed_union}
anonymous
This structure defines an entry in a sparse keymap used by some input devices for which traditional table-based approach is not suitable.