Sparse keymap support
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## Sparse keymap support

struct key_entry — keymap entry for use in sparse keymap
sparse_keymap_entry_from_scancode — perform sparse keymap lookup
sparse_keymap_entry_from_keycode — perform sparse keymap lookup
sparse_keymap_setup — set up sparse keymap for an input device
sparse_keymap_free — free memory allocated for sparse keymap
sparse_keymap_report_entry — report event corresponding to given key entry
sparse_keymap_report_event — report event corresponding to given scancode

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