unified_retro_keyboard/firmware/asdf/src/asdf_hook.h

// -*- mode: C; tab-width: 4 ; indent-tabs-mode: nil -*-
//
// Unfified Keyboard Project
// ASDF keyboard firmware
//
// asdf_hook.h
//
// Definitions and prototypes for configurable function hooks
//
// Copyright 2019 David Fenyes
// This program is free software: you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free Software
// Foundation, either version 3 of the License, or (at your option) any later
// version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
// details.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <https://www.gnu.org/licenses/>.
//

#if !defined(ASDF_HOOKS_H)
#define ASDF_HOOKS_H

// These are "hooks" output identifiers that can be mapped to the real outputs using
// keymap initializer commands.
typedef enum {
  ASDF_HOOK_NULL,
  ASDF_HOOK_SCANNER,
  ASDF_HOOK_OUTPUT,
  ASDF_HOOK_EACH_SCAN,
  ASDF_NUM_HOOKS,
} asdf_hook_id_t;

#define ASDF_HOOK_KEYMAP_SETUP ASDF_NUM_HOOKS

// Each keymap specifies an array of initializer structs to configure function hooks,
// specifying the hook ID and mapped function.

typedef void (*asdf_hook_function_t)(void);

typedef struct {
  asdf_hook_id_t hook_id;
  asdf_hook_function_t hook_func;
} asdf_hook_initializer_t;


// PROCEDURE: asdf_hook_execute
// INPUTS: (asdf_hook_id_t) hook_id: The hook for which to execute attache functions.
// OUTPUTS: none
// DESCRIPTION: if the hook ID is valid, then execute the function attached to the hook.
// SIDE EFFECTS: variable depending on the hooks.
void asdf_hook_execute(asdf_hook_id_t hook_id);

// PROCEDURE: asdf_hook_get
// INPUTS: (asdf_hook_id_t) hook_id: The hook for which to retrieve the attached
// function.
// OUTPUTS: none
// DESCRIPTION: if the hook ID is valid, then retrieve the function attached to the hook.
// SIDE EFFECTS: none
asdf_hook_function_t asdf_hook_get(asdf_hook_id_t hook_id);

// PROCEDURE: asdf_hook_init
// INPUTS: (asdf_hook_initializer_t *) initializer_list - contains the hook
//         initializer list for the selected keymap.
// OUTPUTS: none
// DESCRIPTION: Initializes function hooks for the selected keymap. If a
// function is assigned to the "KEYMAP_SETUP" hook, then execute the function.
// There is no actual slot where KEYMAP_SETUP functions are stored.
void asdf_hook_init(asdf_hook_initializer_t *const initializer_list);

#endif /* !defined (ASDF_HOOKS_H) */

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