zmk/app/src/hid.c

/*
 * Copyright (c) 2020 The ZMK Contributors
 *
 * SPDX-License-Identifier: MIT
 */

#include <logging/log.h>
LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);

#include <zmk/hid.h>

static struct zmk_hid_keypad_report kp_report = {.report_id = 1,
                                                 .body = {.modifiers = 0, .keys = {0}}};

static struct zmk_hid_consumer_report consumer_report = {.report_id = 2,
                                                         .body = {.keys = {0, 0, 0, 0, 0, 0}}};

#define _TOGGLE_MOD(mod, state)                                                                    \
    if (modifier > MOD_RGUI) {                                                                     \
        return -EINVAL;                                                                            \
    }                                                                                              \
    WRITE_BIT(kp_report.body.modifiers, mod, state);                                               \
    return 0;

int zmk_hid_register_mod(zmk_mod modifier) { _TOGGLE_MOD(modifier, true); }
int zmk_hid_unregister_mod(zmk_mod modifier) { _TOGGLE_MOD(modifier, false); }

int zmk_hid_register_mods(zmk_mod_flags modifiers) {
    kp_report.body.modifiers |= modifiers;
    return 0;
}

int zmk_hid_unregister_mods(zmk_mod_flags modifiers) {
    kp_report.body.modifiers &= ~modifiers;
    return 0;
}

#define MAX_KEYS 6

#define TOGGLE_KEYPAD(match, val)                                                                  \
    for (int idx = 0; idx < ZMK_HID_KEYPAD_NKRO_SIZE; idx++) {                                     \
        if (kp_report.body.keys[idx] != match) {                                                   \
            continue;                                                                              \
        }                                                                                          \
        kp_report.body.keys[idx] = val;                                                            \
        break;                                                                                     \
    }

#define TOGGLE_CONSUMER(match, val)                                                                \
    for (int idx = 0; idx < MAX_KEYS; idx++) {                                                     \
        if (consumer_report.body.keys[idx] != match) {                                             \
            continue;                                                                              \
        }                                                                                          \
        consumer_report.body.keys[idx] = val;                                                      \
        break;                                                                                     \
    }

int zmk_hid_keypad_press(zmk_key code) {
    if (code >= LCTL && code <= RGUI) {
        return zmk_hid_register_mod(code - LCTL);
    }
    TOGGLE_KEYPAD(0U, code);
    return 0;
};

int zmk_hid_keypad_release(zmk_key code) {
    if (code >= LCTL && code <= RGUI) {
        return zmk_hid_unregister_mod(code - LCTL);
    }
    TOGGLE_KEYPAD(code, 0U);
    return 0;
};

int zmk_hid_consumer_press(zmk_key code) {
    TOGGLE_CONSUMER(0U, code);
    return 0;
};

int zmk_hid_consumer_release(zmk_key code) {
    TOGGLE_CONSUMER(code, 0U);
    return 0;
};

struct zmk_hid_keypad_report *zmk_hid_get_keypad_report() {
    return &kp_report;
}

struct zmk_hid_consumer_report *zmk_hid_get_consumer_report() {
    return &consumer_report;
}