[Keyboard] Add Torn keyboard (#10207)

* Add Torn keyboard

* Apply suggestions from code review

Co-authored-by: Nick Brassel <nick@tzarc.org>

* Remove via json file

* Add mcp23081_pin_t

* Apply suggestions from code review

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Drashna Jaelre <drashna@live.com>

* Apply suggestions from code review

Co-authored-by: Ryan <fauxpark@gmail.com>

Co-authored-by: Richard Titmuss <richardt@spotify.com>
Co-authored-by: Nick Brassel <nick@tzarc.org>
Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>
Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

14 files changed, 861 insertions, 0 deletions

diff --git a/keyboards/torn/config.h b/keyboards/torn/config.h
new file mode 100644
index 0000000000..6cd6c2808e
--- /dev/null
+++ b/keyboards/torn/config.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2020 Richard Titmuss <richard.titmuss@gmail.com>
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "config_common.h"
+
+/* USB Device descriptor parameter */
+/* VID & PID from vusb project, see tmk_core/protocol/vusb/USB-IDs-for-free.txt"*/
+#define VENDOR_ID 0x7274
+#define PRODUCT_ID 0x0001
+#define DEVICE_VER 0x0000
+#define MANUFACTURER richard.titmuss
+#define PRODUCT Torn
+
+/* key matrix size */
+#define MATRIX_ROWS 4
+#define MATRIX_COLS 12
+
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+ */
+#define MATRIX_ROW_PINS \
+    { D4, D1, D0, D5 }
+#define MATRIX_COL_PINS \
+    { B3, B4, B5, B0, D7, D6 }
+#define UNUSED_PINS
+
+#define SECONDARY_ROW_PINS \
+    { (1 << 5), (1 << 6), (1 << 7), (1 << 4) }
+#define SECONDARY_COL_PINS \
+    { (1 << 3), (1 << 2), (1 << 1), (1 << 0), (1 << 15), (1 << 14) }
+
+/* COL2ROW, ROW2COL*/
+#define DIODE_DIRECTION COL2ROW
+
+#define ENCODERS_PAD_A \
+    { B2 }
+#define ENCODERS_PAD_B \
+    { B1 }
+
+#define USB_MAX_POWER_CONSUMPTION 100
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCE 5
+
+#define OLED_TIMEOUT 60000
diff --git a/keyboards/torn/info.json b/keyboards/torn/info.json
new file mode 100644
index 0000000000..340eb73597
--- /dev/null
+++ b/keyboards/torn/info.json
@@ -0,0 +1,57 @@
+{
+  "keyboard_name": "Torn / Split Through Hole",
+  "url": "https://github.com/rtitmuss/torn",
+  "maintainer": "rtitmuss",
+  "width": 15,
+  "height": 4.55,
+  "layouts": {
+    "LAYOUT_split_3x6_4": {
+      "layout": [
+        {"label":"SW1",  "x":0, "y":0.375},
+        {"label":"SW2",  "x":1, "y":0.375},
+        {"label":"SW3",  "x":2, "y":0.125},
+        {"label":"SW4",  "x":3, "y":0},
+        {"label":"SW5",  "x":4, "y":0.125},
+        {"label":"SW6",  "x":5, "y":0.25},
+        {"label":"SW23", "x":9, "y":0.25},
+        {"label":"SW24", "x":10, "y":0.125},
+        {"label":"SW25", "x":11, "y":0},
+        {"label":"SW26", "x":12, "y":0.125},
+        {"label":"SW27", "x":13, "y":0.375},
+        {"label":"SW28", "x":14, "y":0.375},
+        {"label":"SW7",  "x":0, "y":1.375},
+        {"label":"SW8",  "x":1, "y":1.375},
+        {"label":"SW9",  "x":2, "y":1.125},
+        {"label":"SW10", "x":3, "y":1},
+        {"label":"SW11", "x":4, "y":1.125},
+        {"label":"SW12", "x":5, "y":1.25},
+        {"label":"SW29", "x":9, "y":1.25},
+        {"label":"SW30", "x":10, "y":1.125},
+        {"label":"SW31", "x":11, "y":1},
+        {"label":"SW32", "x":12, "y":1.125},
+        {"label":"SW33", "x":13, "y":1.375},
+        {"label":"SW34", "x":14, "y":1.375},
+        {"label":"SW13", "x":0, "y":2.375},
+        {"label":"SW14", "x":1, "y":2.375},
+        {"label":"SW15", "x":2, "y":2.125},
+        {"label":"SW16", "x":3, "y":2},
+        {"label":"SW17", "x":4, "y":2.125},
+        {"label":"SW18", "x":5, "y":2.25},
+        {"label":"SW35", "x":9, "y":2.25},
+        {"label":"SW36", "x":10, "y":2.125},
+        {"label":"SW37", "x":11, "y":2},
+        {"label":"SW38", "x":12, "y":2.125},
+        {"label":"SW39", "x":13, "y":2.375},
+        {"label":"SW40", "x":14, "y":2.375},
+        {"label":"SW19", "x":3, "y":3.1},
+        {"label":"SW20", "x":4, "y":3.25},
+        {"label":"SW21", "x":5, "y":3.40},
+        {"label":"SW22", "x":6, "y":3.55},
+        {"label":"SW41", "x":8, "y":3.55},
+        {"label":"SW42", "x":9, "y":3.40},
+        {"label":"SW43", "x":10, "y":3.25},
+        {"label":"SW44", "x":11, "y":3.1}
+      ]
+    }
+  }
+}
diff --git a/keyboards/torn/keymaps/default/keymap.c b/keyboards/torn/keymaps/default/keymap.c
new file mode 100644
index 0000000000..7c91325bdc
--- /dev/null
+++ b/keyboards/torn/keymaps/default/keymap.c
@@ -0,0 +1,119 @@
+/* Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include QMK_KEYBOARD_H
+
+enum torn_layers { _QWERTY, _LOWER, _RAISE, _ADJUST };
+
+#define S_BSPC LSFT_T(KC_BSPC)
+#define R_DEL LT(_RAISE, KC_DEL)
+#define G_ENT LGUI_T(KC_ENT)
+#define L_SPC LT(_LOWER, KC_SPC)
+
+// clang-format off
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+/* Qwerty
+ * ,-----------------------------------------.    ,-----------------------------------------.
+ * | Tab  |   Q  |   W  |   E  |   R  |   T  |    |   Y  |   U  |   I  |   O  |   P  |  '   |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * | `    |   A  |   S  |   D  |   F  |   G  |    |   H  |   J  |   K  |   L  |   ;  |  [   |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * | \    |   Z  |   X  |   C  |   V  |   B  |    |   N  |   M  |   ,  |   .  |   /  |  ]   |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ *               | ____ | Ctrl | Bksp | Del  |    |Enter |Space | Alt  | ____ |
+ *               |      |      |Shift |Raise |    | Gui  |Lower |      |      |
+ *               `---------------------------'    `---------------------------'
+ */
+[_QWERTY] = LAYOUT_split_3x6_4(
+    KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,      KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_QUOT,
+    KC_GRV,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,      KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_LBRC,
+    KC_BSLS, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,      KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RBRC ,
+                      _______, KC_LCTL, S_BSPC,  R_DEL,     G_ENT,   L_SPC,   KC_RALT, _______
+),
+
+/* Lower
+ * ,-----------------------------------------.    ,-----------------------------------------.
+ * | Esc  |   !  |   @  |   #  |   $  |   %  |    |   ^  |   &  |   *  |   (  |   )  |      |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * | =    |   1  |   2  |   3  |   4  |   5  |    |   6  |   7  |   8  |   9  |   0  |  -   |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * | _    |      |      |      |      |      |    |      |      |   ,  |   .  |   /  |  +   |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ *               | ____ | Ctrl | Bksp | Del  |    |Enter |Space | Alt  | ____ |
+ *               |      |      |Shift |Raise |    | Gui  |Lower |      |      |
+ *               `---------------------------'    `---------------------------'
+ */
+[_LOWER] = LAYOUT_split_3x6_4(
+    KC_ESC,  KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC,   KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, _______,
+    KC_EQL,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,      KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_PMNS,
+    KC_UNDS, _______, _______, _______, _______, _______,   _______, _______, KC_COMM, KC_DOT,  KC_SLSH, KC_PPLS,
+                      KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+),
+
+/* Raise
+ * ,-----------------------------------------.    ,-----------------------------------------.
+ * |      |  F1  |  F2  |  F3  |  F4  |  F5  |    |      |   &  |   *  |   (  |   )  |      |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * |      |  F6  |  F7  |  F8  |  F9  |  F10 |    | Home | Left | Down | Right| End  | PgUp |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * |      |  F11 |  F12 |      |      |      |    |      |      |      |      |      | PgDn |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ *               | ____ | Ctrl | Bksp | Del  |    |Enter |Space | Alt  | ____ |
+ *               |      |      |Shift |Raise |    | Gui  |Lower |      |      |
+ *               `---------------------------'    `---------------------------'
+ */
+[_RAISE] = LAYOUT_split_3x6_4(
+    _______, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,     _______, S(A(KC_LEFT)), KC_UP, S(A(KC_RGHT)), _______, _______,
+    _______, KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,    KC_HOME, KC_LEFT, KC_DOWN, KC_RGHT, KC_END,  KC_PGUP,
+    _______, KC_F11,  KC_F12,  _______, _______, _______,   A(KC_BSPC), A(KC_LEFT), S(KC_DOWN), A(KC_RGHT), _______, KC_PGDN ,
+                      KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+),
+
+/* Adjust (Lower + Raise)
+ * ,-----------------------------------------.    ,-----------------------------------------.
+ * |      |      |      |      |      |      |    |      |      |      |      |      |      |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * |      |      |      |      |      |      |    |      |      |      |      |      |      |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * |      |      |      |      |      |      |    |      |      |      |      |      |      |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ *               | ____ | Ctrl | Bksp | Del  |    |Enter |Space | Alt  | ____ |
+ *               |      |      |Shift |Raise |    | Gui  |Lower |      |      |
+ *               `---------------------------'    `---------------------------'
+ */
+[_ADJUST] = LAYOUT_split_3x6_4(
+    _______, _______, _______, _______, _______, _______,   _______, _______, _______, _______, _______, _______,
+    _______, _______, _______, _______, _______, _______,   _______, _______, _______, _______, _______, _______,
+    _______, _______, _______, _______, _______, _______,   _______, _______, _______, _______, _______, _______,
+                      KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+)
+
+};
+
+const uint16_t PROGMEM encoder_keymaps[][2][2] = {
+    [_QWERTY] =  { { C(S(KC_TAB)), C(KC_TAB) },     { KC_PGDN,      KC_PGUP } },
+    [_LOWER]  =  { { C(KC_LEFT),   C(KC_RGHT) },    { KC__VOLDOWN,  KC__VOLUP } },
+    [_RAISE]  =  { { KC_TRNS,      KC_TRNS },       { G(KC_TAB),    G(S(KC_TAB)) } },
+    [_ADJUST] =  { { KC_TRNS,      KC_TRNS },       { KC_TRNS,      KC_TRNS } },
+};
+// clang-format on
+
+layer_state_t layer_state_set_user(layer_state_t state) {
+    torn_set_led(0, IS_LAYER_ON_STATE(state, _RAISE));
+    torn_set_led(1, IS_LAYER_ON_STATE(state, _LOWER));
+    return state;
+}
diff --git a/keyboards/torn/keymaps/via/keymap.c b/keyboards/torn/keymaps/via/keymap.c
new file mode 100644
index 0000000000..7c91325bdc
--- /dev/null
+++ b/keyboards/torn/keymaps/via/keymap.c
@@ -0,0 +1,119 @@
+/* Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include QMK_KEYBOARD_H
+
+enum torn_layers { _QWERTY, _LOWER, _RAISE, _ADJUST };
+
+#define S_BSPC LSFT_T(KC_BSPC)
+#define R_DEL LT(_RAISE, KC_DEL)
+#define G_ENT LGUI_T(KC_ENT)
+#define L_SPC LT(_LOWER, KC_SPC)
+
+// clang-format off
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+/* Qwerty
+ * ,-----------------------------------------.    ,-----------------------------------------.
+ * | Tab  |   Q  |   W  |   E  |   R  |   T  |    |   Y  |   U  |   I  |   O  |   P  |  '   |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * | `    |   A  |   S  |   D  |   F  |   G  |    |   H  |   J  |   K  |   L  |   ;  |  [   |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * | \    |   Z  |   X  |   C  |   V  |   B  |    |   N  |   M  |   ,  |   .  |   /  |  ]   |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ *               | ____ | Ctrl | Bksp | Del  |    |Enter |Space | Alt  | ____ |
+ *               |      |      |Shift |Raise |    | Gui  |Lower |      |      |
+ *               `---------------------------'    `---------------------------'
+ */
+[_QWERTY] = LAYOUT_split_3x6_4(
+    KC_TAB,  KC_Q,    KC_W,    KC_E,    KC_R,    KC_T,      KC_Y,    KC_U,    KC_I,    KC_O,    KC_P,    KC_QUOT,
+    KC_GRV,  KC_A,    KC_S,    KC_D,    KC_F,    KC_G,      KC_H,    KC_J,    KC_K,    KC_L,    KC_SCLN, KC_LBRC,
+    KC_BSLS, KC_Z,    KC_X,    KC_C,    KC_V,    KC_B,      KC_N,    KC_M,    KC_COMM, KC_DOT,  KC_SLSH, KC_RBRC ,
+                      _______, KC_LCTL, S_BSPC,  R_DEL,     G_ENT,   L_SPC,   KC_RALT, _______
+),
+
+/* Lower
+ * ,-----------------------------------------.    ,-----------------------------------------.
+ * | Esc  |   !  |   @  |   #  |   $  |   %  |    |   ^  |   &  |   *  |   (  |   )  |      |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * | =    |   1  |   2  |   3  |   4  |   5  |    |   6  |   7  |   8  |   9  |   0  |  -   |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * | _    |      |      |      |      |      |    |      |      |   ,  |   .  |   /  |  +   |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ *               | ____ | Ctrl | Bksp | Del  |    |Enter |Space | Alt  | ____ |
+ *               |      |      |Shift |Raise |    | Gui  |Lower |      |      |
+ *               `---------------------------'    `---------------------------'
+ */
+[_LOWER] = LAYOUT_split_3x6_4(
+    KC_ESC,  KC_EXLM, KC_AT,   KC_HASH, KC_DLR,  KC_PERC,   KC_CIRC, KC_AMPR, KC_ASTR, KC_LPRN, KC_RPRN, _______,
+    KC_EQL,  KC_1,    KC_2,    KC_3,    KC_4,    KC_5,      KC_6,    KC_7,    KC_8,    KC_9,    KC_0,    KC_PMNS,
+    KC_UNDS, _______, _______, _______, _______, _______,   _______, _______, KC_COMM, KC_DOT,  KC_SLSH, KC_PPLS,
+                      KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+),
+
+/* Raise
+ * ,-----------------------------------------.    ,-----------------------------------------.
+ * |      |  F1  |  F2  |  F3  |  F4  |  F5  |    |      |   &  |   *  |   (  |   )  |      |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * |      |  F6  |  F7  |  F8  |  F9  |  F10 |    | Home | Left | Down | Right| End  | PgUp |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * |      |  F11 |  F12 |      |      |      |    |      |      |      |      |      | PgDn |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ *               | ____ | Ctrl | Bksp | Del  |    |Enter |Space | Alt  | ____ |
+ *               |      |      |Shift |Raise |    | Gui  |Lower |      |      |
+ *               `---------------------------'    `---------------------------'
+ */
+[_RAISE] = LAYOUT_split_3x6_4(
+    _______, KC_F1,   KC_F2,   KC_F3,   KC_F4,   KC_F5,     _______, S(A(KC_LEFT)), KC_UP, S(A(KC_RGHT)), _______, _______,
+    _______, KC_F6,   KC_F7,   KC_F8,   KC_F9,   KC_F10,    KC_HOME, KC_LEFT, KC_DOWN, KC_RGHT, KC_END,  KC_PGUP,
+    _______, KC_F11,  KC_F12,  _______, _______, _______,   A(KC_BSPC), A(KC_LEFT), S(KC_DOWN), A(KC_RGHT), _______, KC_PGDN ,
+                      KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+),
+
+/* Adjust (Lower + Raise)
+ * ,-----------------------------------------.    ,-----------------------------------------.
+ * |      |      |      |      |      |      |    |      |      |      |      |      |      |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * |      |      |      |      |      |      |    |      |      |      |      |      |      |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ * |      |      |      |      |      |      |    |      |      |      |      |      |      |
+ * |------+------+------+------+------+------|    |------+------+------+------+------+------|
+ *               | ____ | Ctrl | Bksp | Del  |    |Enter |Space | Alt  | ____ |
+ *               |      |      |Shift |Raise |    | Gui  |Lower |      |      |
+ *               `---------------------------'    `---------------------------'
+ */
+[_ADJUST] = LAYOUT_split_3x6_4(
+    _______, _______, _______, _______, _______, _______,   _______, _______, _______, _______, _______, _______,
+    _______, _______, _______, _______, _______, _______,   _______, _______, _______, _______, _______, _______,
+    _______, _______, _______, _______, _______, _______,   _______, _______, _______, _______, _______, _______,
+                      KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS,   KC_TRNS, KC_TRNS, KC_TRNS, KC_TRNS
+)
+
+};
+
+const uint16_t PROGMEM encoder_keymaps[][2][2] = {
+    [_QWERTY] =  { { C(S(KC_TAB)), C(KC_TAB) },     { KC_PGDN,      KC_PGUP } },
+    [_LOWER]  =  { { C(KC_LEFT),   C(KC_RGHT) },    { KC__VOLDOWN,  KC__VOLUP } },
+    [_RAISE]  =  { { KC_TRNS,      KC_TRNS },       { G(KC_TAB),    G(S(KC_TAB)) } },
+    [_ADJUST] =  { { KC_TRNS,      KC_TRNS },       { KC_TRNS,      KC_TRNS } },
+};
+// clang-format on
+
+layer_state_t layer_state_set_user(layer_state_t state) {
+    torn_set_led(0, IS_LAYER_ON_STATE(state, _RAISE));
+    torn_set_led(1, IS_LAYER_ON_STATE(state, _LOWER));
+    return state;
+}
diff --git a/keyboards/torn/keymaps/via/rules.mk b/keyboards/torn/keymaps/via/rules.mk
new file mode 100644
index 0000000000..36b7ba9cbc
--- /dev/null
+++ b/keyboards/torn/keymaps/via/rules.mk
@@ -0,0 +1,2 @@
+VIA_ENABLE = yes
+LTO_ENABLE = yes
diff --git a/keyboards/torn/matrix.c b/keyboards/torn/matrix.c
new file mode 100644
index 0000000000..dd7fa1e2e1
--- /dev/null
+++ b/keyboards/torn/matrix.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
+ * Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include QMK_KEYBOARD_H
+#include "mcp23018.h"
+
+#define SPLIT_MATRIX_COLS (MATRIX_COLS / 2)
+#define SECONDARY_ROW_OFFSET (MATRIX_ROWS / 2)
+
+typedef uint16_t mcp23018_pin_t;
+
+static const pin_t          row_pins[MATRIX_ROWS]                 = MATRIX_ROW_PINS;
+static const pin_t          col_pins[SPLIT_MATRIX_COLS]           = MATRIX_COL_PINS;
+static const mcp23018_pin_t secondary_row_pins[MATRIX_ROWS]       = SECONDARY_ROW_PINS;
+static const mcp23018_pin_t secondary_col_pins[SPLIT_MATRIX_COLS] = SECONDARY_COL_PINS;
+
+static void select_row(uint8_t row) {
+    setPinOutput(row_pins[row]);
+    writePinLow(row_pins[row]);
+}
+
+static void unselect_row(uint8_t row) { setPinInputHigh(row_pins[row]); }
+
+static void unselect_rows(void) {
+    for (uint8_t x = 0; x < MATRIX_ROWS; x++) {
+        setPinInputHigh(row_pins[x]);
+    }
+}
+
+static void select_secondary_row(uint8_t row) {
+    uint8_t gpioa = 0xFF & ~secondary_row_pins[row];
+    mcp23018_writeReg(GPIOA, &gpioa, 1);
+}
+
+static void init_pins(void) {
+    unselect_rows();
+    for (uint8_t x = 0; x < SPLIT_MATRIX_COLS; x++) {
+        setPinInputHigh(col_pins[x]);
+    }
+}
+
+static matrix_row_t read_cols(void) {
+    matrix_row_t state = 0;
+
+    // For each col...
+    for (uint8_t col_index = 0; col_index < SPLIT_MATRIX_COLS; col_index++) {
+        // Select the col pin to read (active low)
+        uint8_t pin_state = readPin(col_pins[col_index]);
+
+        // Populate the matrix row with the state of the col pin
+        state |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
+    }
+
+    return state;
+}
+
+static matrix_row_t read_secondary_cols(void) {
+    matrix_row_t state = 0;
+
+    uint8_t mcp23018_pin_state[2];
+    if (mcp23018_readReg(GPIOA, mcp23018_pin_state, 2)) {
+        return 0;
+    }
+
+    uint16_t pins = mcp23018_pin_state[0] | (mcp23018_pin_state[1] << 8);
+
+    for (uint8_t col_index = 0; col_index < SPLIT_MATRIX_COLS; col_index++) {
+        uint16_t pin_state = pins & (secondary_col_pins[col_index]);
+        state |= pin_state ? 0 : (MATRIX_ROW_SHIFTER << col_index);
+    }
+
+    return state;
+}
+
+static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row) {
+    matrix_row_t last_row_value = current_matrix[current_row];
+
+    select_row(current_row);
+    select_secondary_row(current_row);
+
+    current_matrix[current_row] = read_cols() | (read_secondary_cols() << 6);
+
+    unselect_row(current_row);
+
+    return (last_row_value != current_matrix[current_row]);
+}
+
+void matrix_init_custom(void) { init_pins(); }
+
+bool matrix_scan_custom(matrix_row_t current_matrix[]) {
+    bool changed = false;
+
+    for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
+        changed |= read_cols_on_row(current_matrix, current_row);
+    }
+
+    return changed;
+}
diff --git a/keyboards/torn/mcp23018.c b/keyboards/torn/mcp23018.c
new file mode 100644
index 0000000000..c180f1dae5
--- /dev/null
+++ b/keyboards/torn/mcp23018.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
+ * Copyright 2012-2018 Jun Wako, Jack Humbert, Yiancar
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include QMK_KEYBOARD_H
+#include "i2c_master.h"
+#include "mcp23018.h"
+
+#define MCP23018_ADDR 0b0100000
+
+#define MCP23018_TIMEOUT 100
+
+static i2c_status_t mcp23018_status = I2C_STATUS_ERROR;
+
+void msp23018_init(void) {
+    mcp23018_status = I2C_STATUS_SUCCESS;
+
+    // Set pin direction
+    uint8_t iodir[] = {0b00001111, 0b11111111};
+    mcp23018_writeReg(IODIRA, iodir, 2);
+
+    // Set pull-up
+    uint8_t gppu[] = {0b00001111, 0b11111000};
+    mcp23018_writeReg(GPPUA, gppu, 2);
+
+    // LEDs output high
+    uint8_t gpio[] = {0b00000000, 0b00000111};
+    mcp23018_writeReg(GPIOA, gpio, 2);
+}
+
+bool mcp23018_reset_required(void) { return mcp23018_status != I2C_STATUS_SUCCESS; }
+
+i2c_status_t mcp23018_writeReg(uint8_t regaddr, const uint8_t* data, uint16_t length) {
+    if (mcp23018_status) {
+        return mcp23018_status;
+    }
+
+    mcp23018_status = i2c_writeReg((MCP23018_ADDR << 1), regaddr, data, length, MCP23018_TIMEOUT);
+    return mcp23018_status;
+}
+
+i2c_status_t mcp23018_readReg(uint8_t regaddr, uint8_t* data, uint16_t length) {
+    if (mcp23018_status) {
+        return mcp23018_status;
+    }
+
+    mcp23018_status = i2c_readReg((MCP23018_ADDR << 1), regaddr, data, length, MCP23018_TIMEOUT);
+    return mcp23018_status;
+}
diff --git a/keyboards/torn/mcp23018.h b/keyboards/torn/mcp23018.h
new file mode 100644
index 0000000000..17ecaa5a7c
--- /dev/null
+++ b/keyboards/torn/mcp23018.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2020 Richard Titmuss (richard.titmuss@gmail.com)
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#define IODIRA 0x00
+#define IODIRB 0x01
+#define GPPUA 0x0C
+#define GPPUB 0x0D
+#define GPIOA 0x12
+#define GPIOB 0x13
+
+typedef int16_t mcp23018_status_t;
+
+void              msp23018_init(void);
+bool              mcp23018_reset_required(void);
+mcp23018_status_t mcp23018_writeReg(uint8_t regaddr, const uint8_t* data, uint16_t length);
+mcp23018_status_t mcp23018_readReg(uint8_t regaddr, uint8_t* data, uint16_t length);
diff --git a/keyboards/torn/readme.md b/keyboards/torn/readme.md
new file mode 100644
index 0000000000..ffe9a2d9c2
--- /dev/null
+++ b/keyboards/torn/readme.md
@@ -0,0 +1,21 @@
+# TORN// Split Through Hole
+
+![torn](https://raw.githubusercontent.com/rtitmuss/torn/master/doc/img/torn.jpg)
+
+The split keyboard kit made by through hole components only.
+
+The design has been inspired by the Corne, Plaid and Discipline keyboards.
+
+* Keyboard Maintainer: [rtitmuss](https://github.com/rtitmuss)
+* Hardware Supported: TORN, atmega328p
+* Hardware Availability: [GitHub](https://github.com/rtitmuss/torn)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make torn:default
+
+Flashing example for this keyboard:
+
+    make torn:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
diff --git a/keyboards/torn/rules.mk b/keyboards/torn/rules.mk
new file mode 100644
index 0000000000..caf544d137
--- /dev/null
+++ b/keyboards/torn/rules.mk
@@ -0,0 +1,27 @@
+# MCU name
+MCU = atmega328p
+
+# Bootloader selection
+BOOTLOADER = USBasp
+
+# Build Options
+#   change yes to no to disable
+#
+BOOTMAGIC_ENABLE = no       # Virtual DIP switch configuration
+MOUSEKEY_ENABLE = no        # Mouse keys
+EXTRAKEY_ENABLE = no        # Audio control and System control
+CONSOLE_ENABLE = no         # Console for debug
+COMMAND_ENABLE = no         # Commands for debug and configuration
+# Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
+RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
+ENCODER_ENABLE = yes        # Enable rotary encoder
+OLED_DRIVER_ENABLE = yes
+CUSTOM_MATRIX = lite
+
+SRC += matrix.c \
+    mcp23018.c \
+    torn_encoder.c \
+    torn_oled.c
+QUANTUM_LIB_SRC += i2c_master.c
diff --git a/keyboards/torn/torn.c b/keyboards/torn/torn.c
new file mode 100644
index 0000000000..ef5060e602
--- /dev/null
+++ b/keyboards/torn/torn.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2020 Richard Titmuss <richard.titmuss@gmail.com>
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+#include "torn.h"
+#include "i2c_master.h"
+#include "mcp23018.h"
+
+static uint8_t led_state[3] = {1, 1, 1};
+
+void matrix_init_kb(void) {
+    // put your keyboard start-up code here
+    // runs once when the firmware starts up
+    i2c_init();
+
+    matrix_init_user();
+}
+
+void matrix_scan_kb(void) {
+    // put your looping keyboard code here
+    // runs every cycle (a lot)
+    if (mcp23018_reset_required()) {
+        msp23018_init();
+        secondary_encoder_init();
+        // torn_set_led(2, 1);
+    }
+
+    matrix_scan_user();
+    secondary_encoder_read();
+}
+
+void torn_set_led(uint8_t led, bool state) {
+    led_state[led] = !state;
+
+    // toggle leds by setting the pin direction
+    uint8_t iodir = 0b11111000 | led_state[0] << 2 | led_state[1] << 1 | led_state[2];
+    mcp23018_writeReg(IODIRB, &iodir, 1);
+}
diff --git a/keyboards/torn/torn.h b/keyboards/torn/torn.h
new file mode 100644
index 0000000000..c25b5c2a0c
--- /dev/null
+++ b/keyboards/torn/torn.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2020 Richard Titmuss <richard.titmuss@gmail.com>
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "quantum.h"
+
+#define ___ KC_NO
+
+// clang-format off
+#define LAYOUT_split_3x6_4( \
+	k00, k01, k02, k03, k04, k05,   k06, k07, k08, k09, k0a, k0b, \
+	k10, k11, k12, k13, k14, k15,   k16, k17, k18, k19, k1a, k1b, \
+	k20, k21, k22, k23, k24, k25,   k26, k27, k28, k29, k2a, k2b, \
+	          k32, k33, k34, k35,   k36, k37, k38, k39 \
+) { \
+	{ k00, k01, k02, k03, k04, k05,   k06, k07, k08, k09, k0a, k0b }, \
+	{ k10, k11, k12, k13, k14, k15,   k16, k17, k18, k19, k1a, k1b }, \
+	{ k20, k21, k22, k23, k24, k25,   k26, k27, k28, k29, k2a, k2b }, \
+	{ ___, ___, k32, k33, k34, k35,   k36, k37, k38, k39, ___, ___ } \
+}
+// clang-format on
+
+void torn_set_led(uint8_t led, bool on);
+
+void secondary_encoder_read(void);
+void secondary_encoder_init(void);
diff --git a/keyboards/torn/torn_encoder.c b/keyboards/torn/torn_encoder.c
new file mode 100644
index 0000000000..ef9b0873fb
--- /dev/null
+++ b/keyboards/torn/torn_encoder.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2020 Richard Titmuss <richard.titmuss@gmail.com>
+ * Copyright 2018 Jack Humbert <jack.humb@gmail.com>
+ *
+ * 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 2 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 <http://www.gnu.org/licenses/>.
+ */
+
+#include "torn.h"
+#include "mcp23018.h"
+
+#ifndef ENCODER_RESOLUTION
+#    define ENCODER_RESOLUTION 4
+#endif
+
+#define ENCODER_CLOCKWISE true
+#define ENCODER_COUNTER_CLOCKWISE false
+
+static int8_t encoder_LUT[] = {0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0};
+
+static uint8_t encoder_state  = 0;
+static int8_t  encoder_pulses = 0;
+
+extern const uint16_