Merge remote-tracking branch 'origin/develop'

18 files changed, 1987 insertions, 77 deletions

diff --git a/drivers/led/issi/is31fl3731-simple.c b/drivers/led/issi/is31fl3731-simple.c
index f51e2e38af..3abe9ea337 100644
--- a/drivers/led/issi/is31fl3731-simple.c
+++ b/drivers/led/issi/is31fl3731-simple.c
@@ -42,13 +42,13 @@
 #define ISSI_REG_PICTUREFRAME 0x01
 
 // Not defined in the datasheet -- See AN for IC
-#define ISSI_REG_GHOST_IMAGE_PREVENTION 0xC2  // Set bit 4 to enable de-ghosting
+#define ISSI_REG_GHOST_IMAGE_PREVENTION 0xC2 // Set bit 4 to enable de-ghosting
 
 #define ISSI_REG_SHUTDOWN 0x0A
 #define ISSI_REG_AUDIOSYNC 0x06
 
 #define ISSI_COMMANDREGISTER 0xFD
-#define ISSI_BANK_FUNCTIONREG 0x0B  // helpfully called 'page nine'
+#define ISSI_BANK_FUNCTIONREG 0x0B // helpfully called 'page nine'
 
 #ifndef ISSI_TIMEOUT
 #    define ISSI_TIMEOUT 100
@@ -148,7 +148,7 @@ void IS31FL3731_init(uint8_t addr) {
 
     // enable software shutdown
     IS31FL3731_write_register(addr, ISSI_REG_SHUTDOWN, 0x00);
-#ifdef ISSI_3731_DEGHOST  // set to enable de-ghosting of the array
+#ifdef ISSI_3731_DEGHOST // set to enable de-ghosting of the array
     IS31FL3731_write_register(addr, ISSI_REG_GHOST_IMAGE_PREVENTION, 0x10);
 #endif
 
diff --git a/drivers/led/issi/is31fl3731.c b/drivers/led/issi/is31fl3731.c
index e6190a6b90..9c6c29f081 100644
--- a/drivers/led/issi/is31fl3731.c
+++ b/drivers/led/issi/is31fl3731.c
@@ -41,13 +41,13 @@
 #define ISSI_REG_PICTUREFRAME 0x01
 
 // Not defined in the datasheet -- See AN for IC
-#define ISSI_REG_GHOST_IMAGE_PREVENTION 0xC2  // Set bit 4 to enable de-ghosting
+#define ISSI_REG_GHOST_IMAGE_PREVENTION 0xC2 // Set bit 4 to enable de-ghosting
 
 #define ISSI_REG_SHUTDOWN 0x0A
 #define ISSI_REG_AUDIOSYNC 0x06
 
 #define ISSI_COMMANDREGISTER 0xFD
-#define ISSI_BANK_FUNCTIONREG 0x0B  // helpfully called 'page nine'
+#define ISSI_BANK_FUNCTIONREG 0x0B // helpfully called 'page nine'
 
 #ifndef ISSI_TIMEOUT
 #    define ISSI_TIMEOUT 100
@@ -136,7 +136,7 @@ void IS31FL3731_init(uint8_t addr) {
 
     // enable software shutdown
     IS31FL3731_write_register(addr, ISSI_REG_SHUTDOWN, 0x00);
-#ifdef ISSI_3731_DEGHOST  // set to enable de-ghosting of the array
+#ifdef ISSI_3731_DEGHOST // set to enable de-ghosting of the array
     IS31FL3731_write_register(addr, ISSI_REG_GHOST_IMAGE_PREVENTION, 0x10);
 #endif
 
diff --git a/drivers/led/issi/is31fl3733-simple.c b/drivers/led/issi/is31fl3733-simple.c
new file mode 100644
index 0000000000..af006f756d
--- /dev/null
+++ b/drivers/led/issi/is31fl3733-simple.c
@@ -0,0 +1,248 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2021 Doni Crosby
+ * Copyright 2021 Leo Deng
+ *
+ * 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 "is31fl3733-simple.h"
+#include "i2c_master.h"
+#include "wait.h"
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR1 represents A1:A0 of the 7-bit address.
+// ADDR2 represents A3:A2 of the 7-bit address.
+// The result is: 0b101(ADDR2)(ADDR1)
+#define ISSI_ADDR_DEFAULT 0x50
+
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_INTERRUPTMASKREGISTER 0xF0
+#define ISSI_INTERRUPTSTATUSREGISTER 0xF1
+
+#define ISSI_PAGE_LEDCONTROL 0x00 // PG0
+#define ISSI_PAGE_PWM 0x01        // PG1
+#define ISSI_PAGE_AUTOBREATH 0x02 // PG2
+#define ISSI_PAGE_FUNCTION 0x03   // PG3
+
+#define ISSI_REG_CONFIGURATION 0x00 // PG3
+#define ISSI_REG_GLOBALCURRENT 0x01 // PG3
+#define ISSI_REG_RESET 0x11         // PG3
+#define ISSI_REG_SWPULLUP 0x0F      // PG3
+#define ISSI_REG_CSPULLUP 0x10      // PG3
+
+#ifndef ISSI_TIMEOUT
+#    define ISSI_TIMEOUT 100
+#endif
+
+#ifndef ISSI_PERSISTENCE
+#    define ISSI_PERSISTENCE 0
+#endif
+
+#ifndef ISSI_PWM_FREQUENCY
+#    define ISSI_PWM_FREQUENCY 0b000 // PFS - IS31FL3733B only
+#endif
+
+#ifndef ISSI_SWPULLUP
+#    define ISSI_SWPULLUP PUR_0R
+#endif
+
+#ifndef ISSI_CSPULLUP
+#    define ISSI_CSPULLUP PUR_0R
+#endif
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20];
+
+// These buffers match the IS31FL3733 PWM registers.
+// The control buffers match the PG0 LED On/Off registers.
+// Storing them like this is optimal for I2C transfers to the registers.
+// We could optimize this and take out the unused registers from these
+// buffers and the transfers in IS31FL3733_write_pwm_buffer() but it's
+// probably not worth the extra complexity.
+uint8_t g_pwm_buffer[LED_DRIVER_COUNT][192];
+bool    g_pwm_buffer_update_required[LED_DRIVER_COUNT] = {false};
+
+/* There's probably a better way to init this... */
+#if LED_DRIVER_COUNT == 1
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][24] = {{0}};
+#elif LED_DRIVER_COUNT == 2
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][24] = {{0}, {0}};
+#elif LED_DRIVER_COUNT == 3
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][24] = {{0}, {0}, {0}};
+#elif LED_DRIVER_COUNT == 4
+uint8_t g_led_control_registers[LED_DRIVER_COUNT][24] = {{0}, {0}, {0}, {0}};
+#endif
+bool g_led_control_registers_update_required[LED_DRIVER_COUNT] = {false};
+
+bool IS31FL3733_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    // If the transaction fails function returns false.
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) != 0) {
+            return false;
+        }
+    }
+#else
+    if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) != 0) {
+        return false;
+    }
+#endif
+    return true;
+}
+
+bool IS31FL3733_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // Assumes PG1 is already selected.
+    // If any of the transactions fails function returns false.
+    // Transmit PWM registers in 12 transfers of 16 bytes.
+    // g_twi_transfer_buffer[] is 20 bytes
+
+    // Iterate over the pwm_buffer contents at 16 byte intervals.
+    for (int i = 0; i < 192; i += 16) {
+        g_twi_transfer_buffer[0] = i;
+        // Copy the data from i to i+15.
+        // Device will auto-increment register for data after the first byte
+        // Thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer.
+        for (int j = 0; j < 16; j++) {
+            g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
+        }
+
+#if ISSI_PERSISTENCE > 0
+        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) != 0) {
+                return false;
+            }
+        }
+#else
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) != 0) {
+            return false;
+        }
+#endif
+    }
+    return true;
+}
+
+void IS31FL3733_init(uint8_t addr, uint8_t sync) {
+    // In order to avoid the LEDs being driven with garbage data
+    // in the LED driver's PWM registers, shutdown is enabled last.
+    // Set up the mode and other settings, clear the PWM registers,
+    // then disable software shutdown.
+    // Sync is passed so set it according to the datasheet.
+
+    // Unlock the command register.
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG0
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+    // Turn off all LEDs.
+    for (int i = 0x00; i <= 0x17; i++) {
+        IS31FL3733_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG1
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+    // Set PWM on all LEDs to 0
+    // No need to setup Breath registers to PWM as that is the default.
+    for (int i = 0x00; i <= 0xBF; i++) {
+        IS31FL3733_write_register(addr, i, 0x00);
+    }
+
+    // Unlock the command register.
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+
+    // Select PG3
+    IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_FUNCTION);
+    // Set de-ghost pull-up resistors (SWx)
+    IS31FL3733_write_register(addr, ISSI_REG_SWPULLUP, ISSI_SWPULLUP);
+    // Set de-ghost pull-down resistors (CSx)
+    IS31FL3733_write_register(addr, ISSI_REG_CSPULLUP, ISSI_CSPULLUP);
+    // Set global current to maximum.
+    IS31FL3733_write_register(addr, ISSI_REG_GLOBALCURRENT, 0xFF);
+    // Disable software shutdown.
+    IS31FL3733_write_register(addr, ISSI_REG_CONFIGURATION, ((sync & 0b11) << 6) | ((ISSI_PWM_FREQUENCY & 0b111) << 3) | 0x01);
+
+    // Wait 10ms to ensure the device has woken up.
+    wait_ms(10);
+}
+
+void IS31FL3733_set_value(int index, uint8_t value) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+
+        g_pwm_buffer[led.driver][led.v]          = value;
+        g_pwm_buffer_update_required[led.driver] = true;
+    }
+}
+
+void IS31FL3733_set_value_all(uint8_t value) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL3733_set_value(i, value);
+    }
+}
+
+void IS31FL3733_set_led_control_register(uint8_t index, bool value) {
+    is31_led led = g_is31_leds[index];
+
+    uint8_t control_register = led.v / 8;
+    uint8_t bit_value        = led.v % 8;
+
+    if (value) {
+        g_led_control_registers[led.driver][control_register] |= (1 << bit_value);
+    } else {
+        g_led_control_registers[led.driver][control_register] &= ~(1 << bit_value);
+    }
+
+    g_led_control_registers_update_required[led.driver] = true;
+}
+
+void IS31FL3733_update_pwm_buffers(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        // Firstly we need to unlock the command register and select PG1.
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
+
+        // If any of the transactions fail we risk writing dirty PG0,
+        // refresh page 0 just in case.
+        if (!IS31FL3733_write_pwm_buffer(addr, g_pwm_buffer[index])) {
+            g_led_control_registers_update_required[index] = true;
+        }
+        g_pwm_buffer_update_required[index] = false;
+    }
+}
+
+void IS31FL3733_update_led_control_registers(uint8_t addr, uint8_t index) {
+    if (g_led_control_registers_update_required[index]) {
+        // Firstly we need to unlock the command register and select PG0
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
+        IS31FL3733_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
+        for (int i = 0; i < 24; i++) {
+            IS31FL3733_write_register(addr, i, g_led_control_registers[index][i]);
+        }
+        g_led_control_registers_update_required[index] = false;
+    }
+}
diff --git a/drivers/led/issi/is31fl3733-simple.h b/drivers/led/issi/is31fl3733-simple.h
new file mode 100644
index 0000000000..f5253e3101
--- /dev/null
+++ b/drivers/led/issi/is31fl3733-simple.h
@@ -0,0 +1,260 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2021 Doni Crosby
+ * Copyright 2021 Leo Deng
+ *
+ * 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 <stdint.h>
+#include <stdbool.h>
+#include "progmem.h"
+
+typedef struct is31_led {
+    uint8_t driver : 2;
+    uint8_t v;
+} __attribute__((packed)) is31_led;
+
+extern const is31_led __flash g_is31_leds[DRIVER_LED_TOTAL];
+
+void IS31FL3733_init(uint8_t addr, uint8_t sync);
+bool IS31FL3733_write_register(uint8_t addr, uint8_t reg, uint8_t data);
+bool IS31FL3733_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer);
+
+void IS31FL3733_set_value(int index, uint8_t value);
+void IS31FL3733_set_value_all(uint8_t value);
+
+void IS31FL3733_set_led_control_register(uint8_t index, bool value);
+
+// This should not be called from an interrupt
+// (eg. from a timer interrupt).
+// Call this while idle (in between matrix scans).
+// If the buffer is dirty, it will update the driver with the buffer.
+void IS31FL3733_update_pwm_buffers(uint8_t addr, uint8_t index);
+void IS31FL3733_update_led_control_registers(uint8_t addr, uint8_t index);
+
+#define PUR_0R 0x00   // No PUR resistor
+#define PUR_05KR 0x02 // 0.5k Ohm resistor in t_NOL
+#define PUR_3KR 0x03  // 3.0k Ohm resistor on all the time
+#define PUR_4KR 0x04  // 4.0k Ohm resistor on all the time
+#define PUR_8KR 0x05  // 8.0k Ohm resistor on all the time
+#define PUR_16KR 0x06 // 16k Ohm resistor on all the time
+#define PUR_32KR 0x07 // 32k Ohm resistor in t_NOL
+
+#define A_1 0x00
+#define A_2 0x01
+#define A_3 0x02
+#define A_4 0x03
+#define A_5 0x04
+#define A_6 0x05
+#define A_7 0x06
+#define A_8 0x07
+#define A_9 0x08
+#define A_10 0x09
+#define A_11 0x0A
+#define A_12 0x0B
+#define A_13 0x0C
+#define A_14 0x0D
+#define A_15 0x0E
+#define A_16 0x0F
+
+#define B_1 0x10
+#define B_2 0x11
+#define B_3 0x12
+#define B_4 0x13
+#define B_5 0x14
+#define B_6 0x15
+#define B_7 0x16
+#define B_8 0x17
+#define B_9 0x18
+#define B_10 0x19
+#define B_11 0x1A
+#define B_12 0x1B
+#define B_13 0x1C
+#define B_14 0x1D
+#define B_15 0x1E
+#define B_16 0x1F
+
+#define C_1 0x20
+#define C_2 0x21
+#define C_3 0x22
+#define C_4 0x23
+#define C_5 0x24
+#define C_6 0x25
+#define C_7 0x26
+#define C_8 0x27
+#define C_9 0x28
+#define C_10 0x29
+#define C_11 0x2A
+#define C_12 0x2B
+#define C_13 0x2C
+#define C_14 0x2D
+#define C_15 0x2E
+#define C_16 0x2F
+
+#define D_1 0x30
+#define D_2 0x31
+#define D_3 0x32
+#define D_4 0x33
+#define D_5 0x34
+#define D_6 0x35
+#define D_7 0x36
+#define D_8 0x37
+#define D_9 0x38
+#define D_10 0x39
+#define D_11 0x3A
+#define D_12 0x3B
+#define D_13 0x3C
+#define D_14 0x3D
+#define D_15 0x3E
+#define D_16 0x3F
+
+#define E_1 0x40
+#define E_2 0x41
+#define E_3 0x42
+#define E_4 0x43
+#define E_5 0x44
+#define E_6 0x45
+#define E_7 0x46
+#define E_8 0x47
+#define E_9 0x48
+#define E_10 0x49
+#define E_11 0x4A
+#define E_12 0x4B
+#define E_13 0x4C
+#define E_14 0x4D
+#define E_15 0x4E
+#define E_16 0x4F
+
+#define F_1 0x50
+#define F_2 0x51
+#define F_3 0x52
+#define F_4 0x53
+#define F_5 0x54
+#define F_6 0x55
+#define F_7 0x56
+#define F_8 0x57
+#define F_9 0x58
+#define F_10 0x59
+#define F_11 0x5A
+#define F_12 0x5B
+#define F_13 0x5C
+#define F_14 0x5D
+#define F_15 0x5E
+#define F_16 0x5F
+
+#define G_1 0x60
+#define G_2 0x61
+#define G_3 0x62
+#define G_4 0x63
+#define G_5 0x64
+#define G_6 0x65
+#define G_7 0x66
+#define G_8 0x67
+#define G_9 0x68
+#define G_10 0x69
+#define G_11 0x6A
+#define G_12 0x6B
+#define G_13 0x6C
+#define G_14 0x6D
+#define G_15 0x6E
+#define G_16 0x6F
+
+#define H_1 0x70
+#define H_2 0x71
+#define H_3 0x72
+#define H_4 0x73
+#define H_5 0x74
+#define H_6 0x75
+#define H_7 0x76
+#define H_8 0x77
+#define H_9 0x78
+#define H_10 0x79
+#define H_11 0x7A
+#define H_12 0x7B
+#define H_13 0x7C
+#define H_14 0x7D
+#define H_15 0x7E
+#define H_16 0x7F
+
+#define I_1 0x80
+#define I_2 0x81
+#define I_3 0x82
+#define I_4 0x83
+#define I_5 0x84
+#define I_6 0x85
+#define I_7 0x86
+#define I_8 0x87
+#define I_9 0x88
+#define I_10 0x89
+#define I_11 0x8A
+#define I_12 0x8B
+#define I_13 0x8C
+#define I_14 0x8D
+#define I_15 0x8E
+#define I_16 0x8F
+
+#define J_1 0x90
+#define J_2 0x91
+#define J_3 0x92
+#define J_4 0x93
+#define J_5 0x94
+#define J_6 0x95
+#define J_7 0x96
+#define J_8 0x97
+#define J_9 0x98
+#define J_10 0x99
+#define J_11 0x9A
+#define J_12 0x9B
+#define J_13 0x9C
+#define J_14 0x9D
+#define J_15 0x9E
+#define J_16 0x9F
+
+#define K_1 0xA0
+#define K_2 0xA1
+#define K_3 0xA2
+#define K_4 0xA3
+#define K_5 0xA4
+#define K_6 0xA5
+#define K_7 0xA6
+#define K_8 0xA7
+#define K_9 0xA8
+#define K_10 0xA9
+#define K_11 0xAA
+#define K_12 0xAB
+#define K_13 0xAC
+#define K_14 0xAD
+#define K_15 0xAE
+#define K_16 0xAF
+
+#define L_1 0xB0
+#define L_2 0xB1
+#define L_3 0xB2
+#define L_4 0xB3
+#define L_5 0xB4
+#define L_6 0xB5
+#define L_7 0xB6
+#define L_8 0xB7
+#define L_9 0xB8
+#define L_10 0xB9
+#define L_11 0xBA
+#define L_12 0xBB
+#define L_13 0xBC
+#define L_14 0xBD
+#define L_15 0xBE
+#define L_16 0xBF
diff --git a/drivers/led/issi/is31fl3733.c b/drivers/led/issi/is31fl3733.c
index 696491d070..a2fdaa90fa 100644
--- a/drivers/led/issi/is31fl3733.c
+++ b/drivers/led/issi/is31fl3733.c
@@ -38,16 +38,16 @@
 #define ISSI_INTERRUPTMASKREGISTER 0xF0
 #define ISSI_INTERRUPTSTATUSREGISTER 0xF1
 
-#define ISSI_PAGE_LEDCONTROL 0x00  // PG0
-#define ISSI_PAGE_PWM 0x01         // PG1
-#define ISSI_PAGE_AUTOBREATH 0x02  // PG2
-#define ISSI_PAGE_FUNCTION 0x03    // PG3
+#define ISSI_PAGE_LEDCONTROL 0x00 // PG0
+#define ISSI_PAGE_PWM 0x01        // PG1
+#define ISSI_PAGE_AUTOBREATH 0x02 // PG2
+#define ISSI_PAGE_FUNCTION 0x03   // PG3
 
-#define ISSI_REG_CONFIGURATION 0x00  // PG3
-#define ISSI_REG_GLOBALCURRENT 0x01  // PG3
-#define ISSI_REG_RESET 0x11          // PG3
-#define ISSI_REG_SWPULLUP 0x0F       // PG3
-#define ISSI_REG_CSPULLUP 0x10       // PG3
+#define ISSI_REG_CONFIGURATION 0x00 // PG3
+#define ISSI_REG_GLOBALCURRENT 0x01 // PG3
+#define ISSI_REG_RESET 0x11         // PG3
+#define ISSI_REG_SWPULLUP 0x0F      // PG3
+#define ISSI_REG_CSPULLUP 0x10      // PG3
 
 #ifndef ISSI_TIMEOUT
 #    define ISSI_TIMEOUT 100
@@ -58,7 +58,7 @@
 #endif
 
 #ifndef ISSI_PWM_FREQUENCY
-#    define ISSI_PWM_FREQUENCY 0b000  // PFS - IS31FL3733B only
+#    define ISSI_PWM_FREQUENCY 0b000 // PFS - IS31FL3733B only
 #endif
 
 #ifndef ISSI_SWPULLUP
diff --git a/drivers/led/issi/is31fl3733.h b/drivers/led/issi/is31fl3733.h
index c5d62fed85..7653dd17c0 100644
--- a/drivers/led/issi/is31fl3733.h
+++ b/drivers/led/issi/is31fl3733.h
@@ -48,13 +48,13 @@ void IS31FL3733_set_led_control_register(uint8_t index, bool red, bool green, bo
 void IS31FL3733_update_pwm_buffers(uint8_t addr, uint8_t index);
 void IS31FL3733_update_led_control_registers(uint8_t addr, uint8_t index);
 
-#define PUR_0R 0x00    // No PUR resistor
-#define PUR_05KR 0x02  // 0.5k Ohm resistor in t_NOL
-#define PUR_3KR 0x03   // 3.0k Ohm resistor on all the time
-#define PUR_4KR 0x04   // 4.0k Ohm resistor on all the time
-#define PUR_8KR 0x05   // 8.0k Ohm resistor on all the time
-#define PUR_16KR 0x06  // 16k Ohm resistor on all the time
-#define PUR_32KR 0x07  // 32k Ohm resistor in t_NOL
+#define PUR_0R 0x00   // No PUR resistor
+#define PUR_05KR 0x02 // 0.5k Ohm resistor in t_NOL
+#define PUR_3KR 0x03  // 3.0k Ohm resistor on all the time
+#define PUR_4KR 0x04  // 4.0k Ohm resistor on all the time
+#define PUR_8KR 0x05  // 8.0k Ohm resistor on all the time
+#define PUR_16KR 0x06 // 16k Ohm resistor on all the time
+#define PUR_32KR 0x07 // 32k Ohm resistor in t_NOL
 
 #define A_1 0x00
 #define A_2 0x01
diff --git a/drivers/led/issi/is31fl3736.c b/drivers/led/issi/is31fl3736.c
index c9a871118d..7752a3f6cb 100644
--- a/drivers/led/issi/is31fl3736.c
+++ b/drivers/led/issi/is31fl3736.c
@@ -36,16 +36,16 @@
 #define ISSI_INTERRUPTMASKREGISTER 0xF0
 #define ISSI_INTERRUPTSTATUSREGISTER 0xF1
 
-#define ISSI_PAGE_LEDCONTROL 0x00  // PG0
-#define ISSI_PAGE_PWM 0x01         // PG1
-#define ISSI_PAGE_AUTOBREATH 0x02  // PG2
-#define ISSI_PAGE_FUNCTION 0x03    // PG3
-
-#define ISSI_REG_CONFIGURATION 0x00  // PG3
-#define ISSI_REG_GLOBALCURRENT 0x01  // PG3
-#define ISSI_REG_RESET 0x11          // PG3
-#define ISSI_REG_SWPULLUP 0x0F       // PG3
-#define ISSI_REG_CSPULLUP 0x10       // PG3
+#define ISSI_PAGE_LEDCONTROL 0x00 // PG0
+#define ISSI_PAGE_PWM 0x01        // PG1
+#define ISSI_PAGE_AUTOBREATH 0x02 // PG2
+#define ISSI_PAGE_FUNCTION 0x03   // PG3
+
+#define ISSI_REG_CONFIGURATION 0x00 // PG3
+#define ISSI_REG_GLOBALCURRENT 0x01 // PG3
+#define ISSI_REG_RESET 0x11         // PG3
+#define ISSI_REG_SWPULLUP 0x0F      // PG3
+#define ISSI_REG_CSPULLUP 0x10      // PG3
 
 #ifndef ISSI_TIMEOUT
 #    define ISSI_TIMEOUT 100
diff --git a/drivers/led/issi/is31fl3736.h b/drivers/led/issi/is31fl3736.h
index 9fbe1cc577..f126034615 100644
--- a/drivers/led/issi/is31fl3736.h
+++ b/drivers/led/issi/is31fl3736.h
@@ -61,14 +61,14 @@ void IS31FL3736_mono_set_led_control_register(uint8_t index, bool enabled);
 void IS31FL3736_update_pwm_buffers(uint8_t addr1, uint8_t addr2);
 void IS31FL3736_update_led_control_registers(uint8_t addr1, uint8_t addr2);
 
-#define PUR_0R 0x00    // No PUR resistor
-#define PUR_05KR 0x01  // 0.5k Ohm resistor
-#define PUR_1KR 0x02   // 1.0k Ohm resistor
-#define PUR_2KR 0x03   // 2.0k Ohm resistor
-#define PUR_4KR 0x04   // 4.0k Ohm resistor
-#define PUR_8KR 0x05   // 8.0k Ohm resistor
-#define PUR_16KR 0x06  // 16k Ohm resistor
-#define PUR_32KR 0x07  // 32k Ohm resistor
+#define PUR_0R 0x00   // No PUR resistor
+#define PUR_05KR 0x01 // 0.5k Ohm resistor
+#define PUR_1KR 0x02  // 1.0k Ohm resistor
+#define PUR_2KR 0x03  // 2.0k Ohm resistor
+#define PUR_4KR 0x04  // 4.0k Ohm resistor
+#define PUR_8KR 0x05  // 8.0k Ohm resistor
+#define PUR_16KR 0x06 // 16k Ohm resistor
+#define PUR_32KR 0x07 // 32k Ohm resistor
 
 #define A_1 0x00
 #define A_2 0x02
diff --git a/drivers/led/issi/is31fl3737.c b/drivers/led/issi/is31fl3737.c
index 0722e18869..9f2a13de45 100644
--- a/drivers/led/issi/is31fl3737.c
+++ b/drivers/led/issi/is31fl3737.c
@@ -38,16 +38,16 @@
 #define ISSI_INTERRUPTMASKREGISTER 0xF0
 #define ISSI_INTERRUPTSTATUSREGISTER 0xF1
 
-#define ISSI_PAGE_LEDCONTROL 0x00  // PG0
-#define ISSI_PAGE_PWM 0x01         // PG1
-#define ISSI_PAGE_AUTOBREATH 0x02  // PG2
-#define ISSI_PAGE_FUNCTION 0x03    // PG3
-
-#define ISSI_REG_CONFIGURATION 0x00  // PG3
-#define ISSI_REG_GLOBALCURRENT 0x01  // PG3
-#define ISSI_REG_RESET 0x11          // PG3
-#define ISSI_REG_SWPULLUP 0x0F       // PG3
-#define ISSI_REG_CSPULLUP 0x10       // PG3
+#define ISSI_PAGE_LEDCONTROL 0x00 // PG0
+#define ISSI_PAGE_PWM 0x01        // PG1
+#define ISSI_PAGE_AUTOBREATH 0x02 // PG2
+#define ISSI_PAGE_FUNCTION 0x03   // PG3
+
+#define ISSI_REG_CONFIGURATION 0x00 // PG3
+#define ISSI_REG_GLOBALCURRENT 0x01 // PG3
+#define ISSI_REG_RESET 0x11         // PG3
+#define ISSI_REG_SWPULLUP 0x0F      // PG3
+#define ISSI_REG_CSPULLUP 0x10      // PG3
 
 #ifndef ISSI_TIMEOUT
 #    define ISSI_TIMEOUT 100
diff --git a/drivers/led/issi/is31fl3737.h b/drivers/led/issi/is31fl3737.h
index 31b1a22267..ddb70a9df5 100644
--- a/drivers/led/issi/is31fl3737.h
+++ b/drivers/led/issi/is31fl3737.h
@@ -48,14 +48,14 @@ void IS31FL3737_set_led_control_register(uint8_t index, bool red, bool green, bo
 void IS31FL3737_update_pwm_buffers(uint8_t addr1, uint8_t addr2);
 void IS31FL3737_update_led_control_registers(uint8_t addr1, uint8_t addr2);
 
-#define PUR_0R 0x00    // No PUR resistor
-#define PUR_05KR 0x01  // 0.5k Ohm resistor in t_NOL
-#define PUR_1KR 0x02   // 1.0k Ohm resistor in t_NOL
-#define PUR_2KR 0x03   // 2.0k Ohm resistor in t_NOL
-#define PUR_4KR 0x04   // 4.0k Ohm resistor in t_NOL
-#define PUR_8KR 0x05   // 8.0k Ohm resistor in t_NOL
-#define PUR_16KR 0x06  // 16k Ohm resistor in t_NOL
-#define PUR_32KR 0x07  // 32k Ohm resistor in t_NOL
+#define PUR_0R 0x00   // No PUR resistor
+#define PUR_05KR 0x01 // 0.5k Ohm resistor in t_NOL
+#define PUR_1KR 0x02  // 1.0k Ohm resistor in t_NOL
+#define PUR_2KR 0x03  // 2.0k Ohm resistor in t_NOL
+#define PUR_4KR 0x04  // 4.0k Ohm resistor in t_NOL
+#define PUR_8KR 0x05  // 8.0k Ohm resistor in t_NOL
+#define PUR_16KR 0x06 // 16k Ohm resistor in t_NOL
+#define PUR_32KR 0x07 // 32k Ohm resistor in t_NOL
 
 #define A_1 0x00
 #define A_2 0x01
diff --git a/drivers/led/issi/is31fl3741.c b/drivers/led/issi/is31fl3741.c
index 8d347a5e60..393b0179b5 100644
--- a/drivers/led/issi/is31fl3741.c
+++ b/drivers/led/issi/is31fl3741.c
@@ -42,16 +42,16 @@
 #define ISSI_INTERRUPTSTATUSREGISTER 0xF1
 #define ISSI_IDREGISTER 0xFC
 
-#define ISSI_PAGE_PWM0 0x00       // PG0
-#define ISSI_PAGE_PWM1 0x01       // PG1
-#define ISSI_PAGE_SCALING_0 0x02  // PG2
-#define ISSI_PAGE_SCALING_1 0x03  // PG3
-#define ISSI_PAGE_FUNCTION 0x04   // PG4
-
-#define ISSI_REG_CONFIGURATION 0x00  // PG4
-#define ISSI_REG_GLOBALCURRENT 0x01  // PG4
-#define ISSI_REG_PULLDOWNUP 0x02     // PG4
-#define ISSI_REG_RESET 0x3F          // PG4
+#define ISSI_PAGE_PWM0 0x00      // PG0
+#define ISSI_PAGE_PWM1 0x01      // PG1
+#define ISSI_PAGE_SCALING_0 0x02 // PG2
+#define ISSI_PAGE_SCALING_1 0x03 // PG3
+#define ISSI_PAGE_FUNCTION 0x04  // PG4
+
+#define ISSI_REG_CONFIGURATION 0x00 // PG4
+#define ISSI_REG_GLOBALCURRENT 0x01 // PG4
+#define ISSI_REG_PULLDOWNUP 0x02    // PG4
+#define ISSI_REG_RESET 0x3F         // PG4
 
 #ifndef ISSI_TIMEOUT
 #    define ISSI_TIMEOUT 100
diff --git a/drivers/led/issi/is31fl3741.h b/drivers/led/issi/is31fl3741.h
index 8154f8be70..3bdb23bd2d 100644
--- a/drivers/led/issi/is31fl3741.h
+++ b/drivers/led/issi/is31fl3741.h
@@ -51,14 +51,14 @@ void IS31FL3741_set_scaling_registers(const is31_led *pled, uint8_t red, uint8_t
 
 void IS31FL3741_set_pwm_buffer(const is31_led *pled, uint8_t red, uint8_t green, uint8_t blue);
 
-#define PUR_0R 0x00    // No PUR resistor
-#define PUR_05KR 0x01  // 0.5k Ohm resistor
-#define PUR_1KR 0x02   // 1.0k Ohm resistor
-#define PUR_2KR 0x03   // 2.0k Ohm resistor
-#define PUR_4KR 0x04   // 4.0k Ohm resistor
-#define PUR_8KR 0x05   // 8.0k Ohm resistor
-#define PUR_16KR 0x06  // 16k Ohm resistor
-#define PUR_32KR 0x07  // 32k Ohm resistor
+#define PUR_0R 0x00   // No PUR resistor
+#define PUR_05KR 0x01 // 0.5k Ohm resistor
+#define PUR_1KR 0x02  // 1.0k Ohm resistor
+#define PUR_2KR 0x03  // 2.0k Ohm resistor
+#define PUR_4KR 0x04  // 4.0k Ohm resistor
+#define PUR_8KR 0x05  // 8.0k Ohm resistor
+#define PUR_16KR 0x06 // 16k Ohm resistor
+#define PUR_32KR 0x07 // 32k Ohm resistor
 
 #define CS1_SW1 0x00
 #define CS2_SW1 0x01
diff --git a/drivers/led/issi/is31fl3742.h b/drivers/led/issi/is31fl3742.h
new file mode 100644
index 0000000000..c96f12d0f1
--- /dev/null
+++ b/drivers/led/issi/is31fl3742.h
@@ -0,0 +1,299 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2020 MelGeek
+ * Copyright 2021 MasterSpoon
+ *
+ * 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
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR represents A1:A0 of the 7-bit address.
+// The result is: 0b01100(ADDR)
+#ifndef DRIVER_ADDR_1
+#    define DRIVER_ADDR_1 0b0110000
+#endif
+
+// Command Registers
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_IDREGISTER 0xFC
+#define ISSI_REGISTER_UNLOCK 0xC5
+
+// Response Registers
+#define ISSI_PAGE_PWM 0x00
+#define ISSI_PAGE_SCALING 0x02
+#define ISSI_PAGE_FUNCTION 0x04
+
+// Registers under Function Register
+#define ISSI_REG_CONFIGURATION 0x00
+#define ISSI_REG_GLOBALCURRENT 0x01
+#define ISSI_REG_PULLDOWNUP 0x02
+#define ISSI_REG_SSR 0x41
+#define ISSI_REG_RESET 0x3F
+#define ISSI_REG_PWM_SET 0x36
+
+// Set defaults for Function Registers
+#ifndef ISSI_CONFIGURATION
+#    define ISSI_CONFIGURATION 0x31
+#endif
+#ifndef ISSI_GLOBALCURRENT
+#    define ISSI_GLOBALCURRENT 0xFF
+#endif
+#ifndef ISSI_PULLDOWNUP
+#    define ISSI_PULLDOWNUP 0x55
+#endif
+#ifndef ISSI_PWM_SET
+#    define ISSI_PWM_SET 0x00
+#endif
+
+// Set defaults for Spread Spectrum Register
+#ifndef ISSI_SSR_1
+#    define ISSI_SSR_1 0x00
+#endif
+#ifndef ISSI_SSR_2
+#    define ISSI_SSR_2 0x00
+#endif
+#ifndef ISSI_SSR_3
+#    define ISSI_SSR_3 0x00
+#endif
+#ifndef ISSI_SSR_4
+#    define ISSI_SSR_4 0x00
+#endif
+
+// Set defaults for Scaling registers
+#ifndef ISSI_SCAL_RED
+#    define ISSI_SCAL_RED 0xFF
+#endif
+#ifndef ISSI_SCAL_BLUE
+#    define ISSI_SCAL_BLUE 0xFF
+#endif
+#ifndef ISSI_SCAL_GREEN
+#    define ISSI_SCAL_GREEN 0xFF
+#endif
+#define ISSI_SCAL_RED_OFF 0x00
+#define ISSI_SCAL_GREEN_OFF 0x00
+#define ISSI_SCAL_BLUE_OFF 0x00
+
+#ifndef ISSI_SCAL_LED
+#    define ISSI_SCAL_LED 0xFF
+#endif
+#define ISSI_SCAL_LED_OFF 0x00
+
+// Set buffer sizes
+#define ISSI_MAX_LEDS 180
+#define ISSI_SCALING_SIZE 180
+#define ISSI_PWM_TRF_SIZE 18
+#define ISSI_SCALING_TRF_SIZE 18
+
+// Location of 1st bit for PWM and Scaling registers
+#define ISSI_PWM_REG_1ST 0x00
+#define ISSI_SCL_REG_1ST 0x00
+
+// Map CS SW locations to order in PWM / Scaling buffers
+// This matches the ORDER in the Datasheet Register not the POSITION
+// It will always count from 0x00 to (ISSI_MAX_LEDS - 1)
+#define CS1_SW1 0x00
+#define CS2_SW1 0x01
+#define CS3_SW1 0x02
+#define CS4_SW1 0x03
+#define CS5_SW1 0x04
+#define CS6_SW1 0x05
+#define CS7_SW1 0x06
+#define CS8_SW1 0x07
+#define CS9_SW1 0x08
+#define CS10_SW1 0x09
+#define CS11_SW1 0x0A
+#define CS12_SW1 0x0B
+#define CS13_SW1 0x0C
+#define CS14_SW1 0x0D
+#define CS15_SW1 0x0E
+#define CS16_SW1 0x0F
+#define CS17_SW1 0x10
+#define CS18_SW1 0x11
+#define CS19_SW1 0x12
+#define CS20_SW1 0x13
+#define CS21_SW1 0x14
+#define CS22_SW1 0x15
+#define CS23_SW1 0x16
+#define CS24_SW1 0x17
+#define CS25_SW1 0x18
+#define CS26_SW1 0x19
+#define CS27_SW1 0x1A
+#define CS28_SW1 0x1B
+#define CS29_SW1 0x1C
+#define CS30_SW1 0x1D
+
+#define CS1_SW2 0x1E
+#define CS2_SW2 0x1F
+#define CS3_SW2 0x20
+#define CS4_SW2 0x21
+#define CS5_SW2 0x22
+#define CS6_SW2 0x23
+#define CS7_SW2 0x24
+#define CS8_SW2 0x25
+#define CS9_SW2 0x26
+#define CS10_SW2 0x27
+#define CS11_SW2 0x28
+#define CS12_SW2 0x29
+#define CS13_SW2 0x2A
+#define CS14_SW2 0x2B
+#define CS15_SW2 0x2C
+#define CS16_SW2 0x2D
+#define CS17_SW2 0x2E
+#define CS18_SW2 0x2F
+#define CS19_SW2 0x30
+#define CS20_SW2 0x31
+#define CS21_SW2 0x32
+#define CS22_SW2 0x33
+#define CS23_SW2 0x34
+#define CS24_SW2 0x35
+#define CS25_SW2 0x36
+#define CS26_SW2 0x37
+#define CS27_SW2 0x38
+#define CS28_SW2 0x39
+#define CS29_SW2 0x3A
+#define CS30_SW2 0x3B
+
+#define CS1_SW3 0x3C
+#define CS2_SW3 0x3D
+#define CS3_SW3 0x3E
+#define CS4_SW3 0x3F
+#define CS5_SW3 0x40
+#define CS6_SW3 0x41
+#define CS7_SW3 0x42
+#define CS8_SW3 0x43
+#define CS9_SW3 0x44
+#define CS10_SW3 0x45
+#define CS11_SW3 0x46
+#define CS12_SW3 0x47
+#define CS13_SW3 0x48
+#define CS14_SW3 0x49
+#define CS15_SW3 0x4A
+#define CS16_SW3 0x4B
+#define CS17_SW3 0x4C
+#define CS18_SW3 0x4D
+#define CS19_SW3 0x4E
+#define CS20_SW3 0x4F
+#define CS21_SW3 0x50
+#define CS22_SW3 0x51
+#define CS23_SW3 0x52
+#define CS24_SW3 0x53
+#define CS25_SW3 0x54
+#define CS26_SW3 0x55
+#define CS27_SW3 0x56
+#define CS28_SW3 0x57
+#define CS29_SW3 0x58
+#define CS30_SW3 0x59
+
+#define CS1_SW4 0x5A
+#define CS2_SW4 0x5B
+#define CS3_SW4 0x5C
+#define CS4_SW4 0x5D
+#define CS5_SW4 0x5E
+#define CS6_SW4 0x5F
+#define CS7_SW4 0x60
+#define CS8_SW4 0x61
+#define CS9_SW4 0x62
+#define CS10_SW4 0x63
+#define CS11_SW4 0x64
+#define CS12_SW4 0x65
+#define CS13_SW4 0x66
+#define CS14_SW4 0x67
+#define CS15_SW4 0x68
+#define CS16_SW4 0x69
+#define CS17_SW4 0x6A
+#define CS18_SW4 0x6B
+#define CS19_SW4 0x6C
+#define CS20_SW4 0x6D
+#define CS21_SW4 0x6E
+#define CS22_SW4 0x6F
+#define CS23_SW4 0x70
+#define CS24_SW4 0x71
+#define CS25_SW4 0x72
+#define CS26_SW4 0x73
+#define CS27_SW4 0x74
+#define CS28_SW4 0x75
+#define CS29_SW4 0x76
+#define CS30_SW4 0x77
+
+#define CS1_SW5 0x78
+#define CS2_SW5 0x79
+#define CS3_SW5 0x7A
+#define CS4_SW5 0x7B
+#define CS5_SW5 0x7C
+#define CS6_SW5 0x7D
+#define CS7_SW5 0x7E
+#define CS8_SW5 0x7F
+#define CS9_SW5 0x80
+#define CS10_SW5 0x81
+#define CS11_SW5 0x82
+#define CS12_SW5 0x83
+#define CS13_SW5 0x84
+#define CS14_SW5 0x85
+#define CS15_SW5 0x86
+#define CS16_SW5 0x87
+#define CS17_SW5 0x88
+#define CS18_SW5 0x89
+#define CS19_SW5 0x8A
+#define CS20_SW5 0x8B
+#define CS21_SW5 0x8C
+#define CS22_SW5 0x8D
+#define CS23_SW5 0x8E
+#define CS24_SW5 0x8F
+#define CS25_SW5 0x90
+#define CS26_SW5 0x91
+#define CS27_SW5 0x92
+#define CS28_SW5 0x93
+#define CS29_SW5 0x94
+#define CS30_SW5 0x95
+
+#define CS1_SW6 0x96
+#define CS2_SW6 0x97
+#define CS3_SW6 0x98
+#define CS4_SW6 0x99
+#define CS5_SW6 0x9A
+#define CS6_SW6 0x9B
+#define CS7_SW6 0x9C
+#define CS8_SW6 0x9D
+#define CS9_SW6 0x9E
+#define CS10_SW6 0x9F
+#define CS11_SW6 0xA0
+#define CS12_SW6 0xA1
+#define CS13_SW6 0xA2
+#define CS14_SW6 0xA3
+#define CS15_SW6 0xA4
+#define CS16_SW6 0xA5
+#define CS17_SW6 0xA6
+#define CS18_SW6 0xA7
+#define CS19_SW6 0xA8
+#define CS20_SW6 0xA9
+#define CS21_SW6 0xAA
+#define CS22_SW6 0xAB
+#define CS23_SW6 0xAC
+#define CS24_SW6 0xAD
+#define CS25_SW6 0xAE
+#define CS26_SW6 0xAF
+#define CS27_SW6 0xB0
+#define CS28_SW6 0xB1
+#define CS29_SW6 0xB2
+#define CS30_SW6 0xB3
diff --git a/drivers/led/issi/is31fl3743.h b/drivers/led/issi/is31fl3743.h
new file mode 100644
index 0000000000..d8fcd79096
--- /dev/null
+++ b/drivers/led/issi/is31fl3743.h
@@ -0,0 +1,327 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2020 MelGeek
+ * Copyright 2021 MasterSpoon
+ *
+ * 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
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR1 represents A1:A0 of the 7-bit address.
+// ADDR2 represents A3:A2 of the 7-bit address.
+// The result is: 0b010(ADDR2)(ADDR1)
+#ifndef DRIVER_ADDR_1
+#    define DRIVER_ADDR_1 0b0100000
+#endif
+
+// Set defaults for Spread Spectrum Register
+#ifndef ISSI_SSR_1
+#    if DRIVER_COUNT == 1
+#        define ISSI_SSR_1 0x00
+#    else
+#        define ISSI_SSR_1 0xC0
+#    endif
+#endif
+#ifndef ISSI_SSR_2
+#    define ISSI_SSR_2 0x80
+#endif
+#ifndef ISSI_SSR_3
+#    define ISSI_SSR_3 0x80
+#endif
+#ifndef ISSI_SSR_4
+#    define ISSI_SSR_4 0x80
+#endif
+
+// Command Registers
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_IDREGISTER 0xFC
+#define ISSI_REGISTER_UNLOCK 0xC5
+
+// Response Registers
+#define ISSI_PAGE_PWM 0x00
+#define ISSI_PAGE_SCALING 0x01
+#define ISSI_PAGE_FUNCTION 0x02
+
+// Registers under Function Register
+#define ISSI_REG_CONFIGURATION 0x00
+#define ISSI_REG_GLOBALCURRENT 0x01
+#define ISSI_REG_PULLDOWNUP 0x02
+#define ISSI_REG_TEMP 0x24
+#define ISSI_REG_SSR 0x25
+#define ISSI_REG_RESET 0x2F
+
+// Set defaults for Function Registers
+#ifndef ISSI_CONFIGURATION
+#    define ISSI_CONFIGURATION 0x01
+#endif
+#ifndef ISSI_GLOBALCURRENT
+#    define ISSI_GLOBALCURRENT 0xFF
+#endif
+#ifndef ISSI_PULLDOWNUP
+#    define ISSI_PULLDOWNUP 0x33
+#endif
+#ifndef ISSI_TEMP
+#    define ISSI_TEMP 0x00
+#endif
+
+// Set defaults for Scaling registers
+#ifndef ISSI_SCAL_RED
+#    define ISSI_SCAL_RED 0xFF
+#endif
+#ifndef ISSI_SCAL_BLUE
+#    define ISSI_SCAL_BLUE 0xFF
+#endif
+#ifndef ISSI_SCAL_GREEN
+#    define ISSI_SCAL_GREEN 0xFF
+#endif
+#define ISSI_SCAL_RED_OFF 0x00
+#define ISSI_SCAL_GREEN_OFF 0x00
+#define ISSI_SCAL_BLUE_OFF 0x00
+
+#ifndef ISSI_SCAL_LED
+#    define ISSI_SCAL_LED 0xFF
+#endif
+#define ISSI_SCAL_LED_OFF 0x00
+
+// Set buffer sizes
+#define ISSI_MAX_LEDS 198
+#define ISSI_SCALING_SIZE 198
+#define ISSI_PWM_TRF_SIZE 18
+#define ISSI_SCALING_TRF_SIZE 18
+
+// Location of 1st bit for PWM and Scaling registers
+#define ISSI_PWM_REG_1ST 0x01
+#define ISSI_SCL_REG_1ST 0x01
+
+// Map CS SW locations to order in PWM / Scaling buffers
+// This matches the ORDER in the Datasheet Register not the POSITION
+// It will always count from 0x00 to (ISSI_MAX_LEDS - 1)
+#define CS1_SW1 0x00
+#define CS2_SW1 0x01
+#define CS3_SW1 0x02
+#define CS4_SW1 0x03
+#define CS5_SW1 0x04
+#define CS6_SW1 0x05
+#define CS7_SW1 0x06
+#define CS8_SW1 0x07
+#define CS9_SW1 0x08
+#define CS10_SW1 0x09
+#define CS11_SW1 0x0A
+#define CS12_SW1 0x0B
+#define CS13_SW1 0x0C
+#define CS14_SW1 0x0D
+#define CS15_SW1 0x0E
+#define CS16_SW1 0x0F
+#define CS17_SW1 0x10
+#define CS18_SW1 0x11
+
+#define CS1_SW2 0x12
+#define CS2_SW2 0x13
+#define CS3_SW2 0x14
+#define CS4_SW2 0x15
+#define CS5_SW2 0x16
+#define CS6_SW2 0x17
+#define CS7_SW2 0x18
+#define CS8_SW2 0x19
+#define CS9_SW2 0x1A
+#define CS10_SW2 0x1B
+#define CS11_SW2 0x1C
+#define CS12_SW2 0x1D
+#define CS13_SW2 0x1E
+#define CS14_SW2 0x1F
+#define CS15_SW2 0x20
+#define CS16_SW2 0x21
+#define CS17_SW2 0x22
+#define CS18_SW2 0x23
+
+#define CS1_SW3 0x24
+#define CS2_SW3 0x25
+#define CS3_SW3 0x26
+#define CS4_SW3 0x27
+#define CS5_SW3 0x28
+#define CS6_SW3 0x29
+#define CS7_SW3 0x2A
+#define CS8_SW3 0x2B
+#define CS9_SW3 0x2C
+#define CS10_SW3 0x2D
+#define CS11_SW3 0x2E
+#define CS12_SW3 0x2F
+#define CS13_SW3 0x30
+#define CS14_SW3 0x31
+#define CS15_SW3 0x32
+#define CS16_SW3 0x33
+#define CS17_SW3 0x34
+#define CS18_SW3 0x35
+
+#define CS1_SW4 0x36
+#define CS2_SW4 0x37
+#define CS3_SW4 0x38
+#define CS4_SW4 0x39
+#define CS5_SW4 0x3A
+#define CS6_SW4 0x3B
+#define CS7_SW4 0x3C
+#define CS8_SW4 0x3D
+#define CS9_SW4 0x3E
+#define CS10_SW4 0x3F
+#define CS11_SW4 0x40
+#define CS12_SW4 0x41
+#define CS13_SW4 0x42
+#define CS14_SW4 0x43
+#define CS15_SW4 0x44
+#define CS16_SW4 0x45
+#define CS17_SW4 0x46
+#define CS18_SW4 0x47
+
+#define CS1_SW5 0x48
+#define CS2_SW5 0x49
+#define CS3_SW5 0x4A
+#define CS4_SW5 0x4B
+#define CS5_SW5 0x4C
+#define CS6_SW5 0x4D
+#define CS7_SW5 0x4E
+#define CS8_SW5 0x4F
+#define CS9_SW5 0x50
+#define CS10_SW5 0x51
+#define CS11_SW5 0x52
+#define CS12_SW5 0x53
+#define CS13_SW5 0x54
+#define CS14_SW5 0x55
+#define CS15_SW5 0x56
+#define CS16_SW5 0x57
+#define CS17_SW5 0x58
+#define CS18_SW5 0x59
+
+#define CS1_SW6 0x5A
+#define CS2_SW6 0x5B
+#define CS3_SW6 0x5C
+#define CS4_SW6 0x5D
+#define CS5_SW6 0x5E
+#define CS6_SW6 0x5F
+#define CS7_SW6 0x60
+#define CS8_SW6 0x61
+#define CS9_SW6 0x62
+#define CS10_SW6 0x63
+#define CS11_SW6 0x64
+#define CS12_SW6 0x65
+#define CS13_SW6 0x66
+#define CS14_SW6 0x67
+#define CS15_SW6 0x68
+#define CS16_SW6 0x69
+#define CS17_SW6 0x6A
+#define CS18_SW6 0x6B
+
+#define CS1_SW7 0x6C
+#define CS2_SW7 0x6D
+#define CS3_SW7 0x6E
+#define CS4_SW7 0x6F
+#define CS5_SW7 0x70
+#define CS6_SW7 0x71
+#define CS7_SW7 0x72
+#define CS8_SW7 0x73
+#define CS9_SW7 0x74
+#define CS10_SW7 0x75
+#define CS11_SW7 0x76
+#define CS12_SW7 0x77
+#define CS13_SW7 0x78
+#define CS14_SW7 0x79
+#define CS15_SW7 0x7A
+#define CS16_SW7 0x7B
+#define CS17_SW7 0x7C
+#define CS18_SW7 0x7D
+
+#define CS1_SW8 0x7E
+#define CS2_SW8 0x7F
+#define CS3_SW8 0x80
+#define CS4_SW8 0x81
+#define CS5_SW8 0x82
+#define CS6_SW8 0x83
+#define CS7_SW8 0x84
+#define CS8_SW8 0x85
+#define CS9_SW8 0x86
+#define CS10_SW8 0x87
+#define CS11_SW8 0x88
+#define CS12_SW8 0x89
+#define CS13_SW8 0x8A
+#define CS14_SW8 0x8B
+#define CS15_SW8 0x8C
+#define CS16_SW8 0x8D
+#define CS17_SW8 0x8E
+#define CS18_SW8 0x8F
+
+#define CS1_SW9 0x90
+#define CS2_SW9 0x91
+#define CS3_SW9 0x92
+#define CS4_SW9 0x93
+#define CS5_SW9 0x94
+#define CS6_SW9 0x95
+#define CS7_SW9 0x96
+#define CS8_SW9 0x97
+#define CS9_SW9 0x98
+#define CS10_SW9 0x99
+#define CS11_SW9 0x9A
+#define CS12_SW9 0x9B
+#define CS13_SW9 0x9C
+#define CS14_SW9 0x9D
+#define CS15_SW9 0x9E
+#define CS16_SW9 0x9F
+#define CS17_SW9 0xA0
+#define CS18_SW9 0xA1
+
+#define CS1_SW10 0xA2
+#define CS2_SW10 0xA3
+#define CS3_SW10 0xA4
+#define CS4_SW10 0xA5
+#define CS5_SW10 0xA6
+#define CS6_SW10 0xA7
+#define CS7_SW10 0xA8
+#define CS8_SW10 0xA9
+#define CS9_SW10 0xAA
+#define CS10_SW10 0xAB
+#define CS11_SW10 0xAC
+#define CS12_SW10 0xAD
+#define CS13_SW10 0xAE
+#define CS14_SW10 0xAF
+#define CS15_SW10 0xB0
+#define CS16_SW10 0xB1
+#define CS17_SW10 0xB2
+#define CS18_SW10 0xB3
+
+#define CS1_SW11 0xB4
+#define CS2_SW11 0xB5
+#define CS3_SW11 0xB6
+#define CS4_SW11 0xB7
+#define CS5_SW11 0xB8
+#define CS6_SW11 0xB9
+#define CS7_SW11 0xBA
+#define CS8_SW11 0xBB
+#define CS9_SW11 0xBC
+#define CS10_SW11 0xBD
+#define CS11_SW11 0xBE
+#define CS12_SW11 0xBF
+#define CS13_SW11 0xC0
+#define CS14_SW11 0xC1
+#define CS15_SW11 0xC2
+#define CS16_SW11 0xC3
+#define CS17_SW11 0xC4
+#define CS18_SW11 0xC5
diff --git a/drivers/led/issi/is31fl3745.h b/drivers/led/issi/is31fl3745.h
new file mode 100644
index 0000000000..ca5dd4a986
--- /dev/null
+++ b/drivers/led/issi/is31fl3745.h
@@ -0,0 +1,270 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2020 MelGeek
+ * Copyright 2021 MasterSpoon
+ *
+ * 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
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR1 represents A1:A0 of the 7-bit address.
+// ADDR2 represents A3:A2 of the 7-bit address.
+// The result is: 0b010(ADDR2)(ADDR1)
+#ifndef DRIVER_ADDR_1
+#    define DRIVER_ADDR_1 0b0100000
+#endif
+
+// Set defaults for Spread Spectrum Register
+#ifndef ISSI_SSR_1
+#    if DRIVER_COUNT == 1
+#        define ISSI_SSR_1 0x00
+#    else
+#        define ISSI_SSR_1 0xC0
+#    endif
+#endif
+#ifndef ISSI_SSR_2
+#    define ISSI_SSR_2 0x80
+#endif
+#ifndef ISSI_SSR_3
+#    define ISSI_SSR_3 0x80
+#endif
+#ifndef ISSI_SSR_4
+#    define ISSI_SSR_4 0x80
+#endif
+
+// Command Registers
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_IDREGISTER 0xFC
+#define ISSI_REGISTER_UNLOCK 0xC5
+
+// Response Registers
+#define ISSI_PAGE_PWM 0x00
+#define ISSI_PAGE_SCALING 0x01
+#define ISSI_PAGE_FUNCTION 0x02
+
+// Registers under Function Register
+#define ISSI_REG_CONFIGURATION 0x00
+#define ISSI_REG_GLOBALCURRENT 0x01
+#define ISSI_REG_PULLDOWNUP 0x02
+#define ISSI_REG_TEMP 0x24
+#define ISSI_REG_SSR 0x25
+#define ISSI_REG_RESET 0x2F
+
+// Set defaults for Function Registers
+#ifndef ISSI_CONFIGURATION
+#    define ISSI_CONFIGURATION 0x31
+#endif
+#ifndef ISSI_GLOBALCURRENT
+#    define ISSI_GLOBALCURRENT 0xFF
+#endif
+#ifndef ISSI_PULLDOWNUP
+#    define ISSI_PULLDOWNUP 0x33
+#endif
+#ifndef ISSI_TEMP
+#    define ISSI_TEMP 0x00
+#endif
+
+// Set defaults for Scaling registers
+#ifndef ISSI_SCAL_RED
+#    define ISSI_SCAL_RED 0xFF
+#endif
+#ifndef ISSI_SCAL_BLUE
+#    define ISSI_SCAL_BLUE 0xFF
+#endif
+#ifndef ISSI_SCAL_GREEN
+#    define ISSI_SCAL_GREEN 0xFF
+#endif
+#define ISSI_SCAL_RED_OFF 0x00
+#define ISSI_SCAL_GREEN_OFF 0x00
+#define ISSI_SCAL_BLUE_OFF 0x00
+
+#ifndef ISSI_SCAL_LED
+#    define ISSI_SCAL_LED 0xFF
+#endif
+#define ISSI_SCAL_LED_OFF 0x00
+
+// Set buffer sizes
+#define ISSI_MAX_LEDS 144
+#define ISSI_SCALING_SIZE 144
+#define ISSI_PWM_TRF_SIZE 18
+#define ISSI_SCALING_TRF_SIZE 18
+
+// Location of 1st bit for PWM and Scaling registers
+#define ISSI_PWM_REG_1ST 0x01
+#define ISSI_SCL_REG_1ST 0x01
+
+// Map CS SW locations to order in PWM / Scaling buffers
+// This matches the ORDER in the Datasheet Register not the POSITION
+// It will always count from 0x00 to (ISSI_MAX_LEDS - 1)
+#define CS1_SW1 0x00
+#define CS2_SW1 0x01
+#define CS3_SW1 0x02
+#define CS4_SW1 0x03
+#define CS5_SW1 0x04
+#define CS6_SW1 0x05
+#define CS7_SW1 0x06
+#define CS8_SW1 0x07
+#define CS9_SW1 0x08
+#define CS10_SW1 0x09
+#define CS11_SW1 0x0A
+#define CS12_SW1 0x0B
+#define CS13_SW1 0x0C
+#define CS14_SW1 0x0D
+#define CS15_SW1 0x0E
+#define CS16_SW1 0x0F
+#define CS17_SW1 0x10
+#define CS18_SW1 0x11
+
+#define CS1_SW2 0x12
+#define CS2_SW2 0x13
+#define CS3_SW2 0x14
+#define CS4_SW2 0x15
+#define CS5_SW2 0x16
+#define CS6_SW2 0x17
+#define CS7_SW2 0x18
+#define CS8_SW2 0x19
+#define CS9_SW2 0x1A
+#define CS10_SW2 0x1B
+#define CS11_SW2 0x1C
+#define CS12_SW2 0x1D
+#define CS13_SW2 0x1E
+#define CS14_SW2 0x1F
+#define CS15_SW2 0x20
+#define CS16_SW2 0x21
+#define CS17_SW2 0x22
+#define CS18_SW2 0x23
+
+#define CS1_SW3 0x24
+#define CS2_SW3 0x25
+#define CS3_SW3 0x26
+#define CS4_SW3 0x27
+#define CS5_SW3 0x28
+#define CS6_SW3 0x29
+#define CS7_SW3 0x2A
+#define CS8_SW3 0x2B
+#define CS9_SW3 0x2C
+#define CS10_SW3 0x2D
+#define CS11_SW3 0x2E
+#define CS12_SW3 0x2F
+#define CS13_SW3 0x30
+#define CS14_SW3 0x31
+#define CS15_SW3 0x32
+#define CS16_SW3 0x33
+#define CS17_SW3 0x34
+#define CS18_SW3 0x35
+
+#define CS1_SW4 0x36
+#define CS2_SW4 0x37
+#define CS3_SW4 0x38
+#define CS4_SW4 0x39
+#define CS5_SW4 0x3A
+#define CS6_SW4 0x3B
+#define CS7_SW4 0x3C
+#define CS8_SW4 0x3D
+#define CS9_SW4 0x3E
+#define CS10_SW4 0x3F
+#define CS11_SW4 0x40
+#define CS12_SW4 0x41
+#define CS13_SW4 0x42
+#define CS14_SW4 0x43
+#define CS15_SW4 0x44
+#define CS16_SW4 0x45
+#define CS17_SW4 0x46
+#define CS18_SW4 0x47
+
+#define CS1_SW5 0x48
+#define CS2_SW5 0x49
+#define CS3_SW5 0x4A
+#define CS4_SW5 0x4B
+#define CS5_SW5 0x4C
+#define CS6_SW5 0x4D
+#define CS7_SW5 0x4E
+#define CS8_SW5 0x4F
+#define CS9_SW5 0x50
+#define CS10_SW5 0x51
+#define CS11_SW5 0x52
+#define CS12_SW5 0x53
+#define CS13_SW5 0x54
+#define CS14_SW5 0x55
+#define CS15_SW5 0x56
+#define CS16_SW5 0x57
+#define CS17_SW5 0x58
+#define CS18_SW5 0x59
+
+#define CS1_SW6 0x5A
+#define CS2_SW6 0x5B
+#define CS3_SW6 0x5C
+#define CS4_SW6 0x5D
+#define CS5_SW6 0x5E
+#define CS6_SW6 0x5F
+#define CS7_SW6 0x60
+#define CS8_SW6 0x61
+#define CS9_SW6 0x62
+#define CS10_SW6 0x63
+#define CS11_SW6 0x64
+#define CS12_SW6 0x65
+#define CS13_SW6 0x66
+#define CS14_SW6 0x67
+#define CS15_SW6 0x68
+#define CS16_SW6 0x69
+#define CS17_SW6 0x6A
+#define CS18_SW6 0x6B
+
+#define CS1_SW7 0x6C
+#define CS2_SW7 0x6D
+#define CS3_SW7 0x6E
+#define CS4_SW7 0x6F
+#define CS5_SW7 0x70
+#define CS6_SW7 0x71
+#define CS7_SW7 0x72
+#define CS8_SW7 0x73
+#define CS9_SW7 0x74
+#define CS10_SW7 0x75
+#define CS11_SW7 0x76
+#define CS12_SW7 0x77
+#define CS13_SW7 0x78
+#define CS14_SW7 0x79
+#define CS15_SW7 0x7A
+#define CS16_SW7 0x7B
+#define CS17_SW7 0x7C
+#define CS18_SW7 0x7D
+
+#define CS1_SW8 0x7E
+#define CS2_SW8 0x7F
+#define CS3_SW8 0x80
+#define CS4_SW8 0x81
+#define CS5_SW8 0x82
+#define CS6_SW8 0x83
+#define CS7_SW8 0x84
+#define CS8_SW8 0x85
+#define CS9_SW8 0x86
+#define CS10_SW8 0x87
+#define CS11_SW8 0x88
+#define CS12_SW8 0x89
+#define CS13_SW8 0x8A
+#define CS14_SW8 0x8B
+#define CS15_SW8 0x8C
+#define CS16_SW8 0x8D
+#define CS17_SW8 0x8E
+#define CS18_SW8 0x8F
diff --git a/drivers/led/issi/is31fl3746.h b/drivers/led/issi/is31fl3746.h
new file mode 100644
index 0000000000..f89f281533
--- /dev/null
+++ b/drivers/led/issi/is31fl3746.h
@@ -0,0 +1,198 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2020 MelGeek
+ * Copyright 2021 MasterSpoon
+ *
+ * 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
+
+// This is a 7-bit address, that gets left-shifted and bit 0
+// set to 0 for write, 1 for read (as per I2C protocol)
+// The address will vary depending on your wiring:
+// 00 <-> GND
+// 01 <-> SCL
+// 10 <-> SDA
+// 11 <-> VCC
+// ADDR1 represents A1:A0 of the 7-bit address.
+// ADDR2 represents A3:A2 of the 7-bit address.
+// The result is: 0b110(ADDR2)(ADDR1)
+#ifndef DRIVER_ADDR_1
+#    define DRIVER_ADDR_1 0b1100000
+#endif
+
+// Set defaults for Spread Spectrum Register
+#ifndef ISSI_SSR_1
+#    define ISSI_SSR_1 0x00
+#endif
+#ifndef ISSI_SSR_2
+#    define ISSI_SSR_2 0x00
+#endif
+#ifndef ISSI_SSR_3
+#    define ISSI_SSR_3 0x00
+#endif
+#ifndef ISSI_SSR_4
+#    define ISSI_SSR_4 0x00
+#endif
+
+// Command Registers
+#define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
+#define ISSI_COMMANDREGISTER 0xFD
+#define ISSI_IDREGISTER 0xFC
+#define ISSI_REGISTER_UNLOCK 0xC5
+
+// Response Registers
+#define ISSI_PAGE_PWM 0x00
+#define ISSI_PAGE_SCALING 0x01
+#define ISSI_PAGE_FUNCTION 0x01
+
+// Registers under Function Register
+#define ISSI_REG_CONFIGURATION 0x50
+#define ISSI_REG_GLOBALCURRENT 0x51
+#define ISSI_REG_PULLDOWNUP 0x52
+#define ISSI_REG_TEMP 0x5F
+#define ISSI_REG_SSR 0x60
+#define ISSI_REG_RESET 0x8F
+#define ISSI_REG_PWM_ENABLE 0xE0
+#define ISSI_REG_PWM_SET 0xE2
+
+// Set defaults for Function Registers
+#ifndef ISSI_CONFIGURATION
+#    define ISSI_CONFIGURATION 0x01
+#endif
+#ifndef ISSI_GLOBALCURRENT
+#    define ISSI_GLOBALCURRENT 0xFF
+#endif
+#ifndef ISSI_PULLDOWNUP
+#    define ISSI_PULLDOWNUP 0x33
+#endif
+#ifndef ISSI_TEMP
+#    define ISSI_TEMP 0x00
+#endif
+#ifndef ISSI_PWM_ENABLE
+#    define ISSI_PWM_ENABLE 0x00
+#endif
+#ifndef ISSI_PWM_SET
+#    define ISSI_PWM_SET 0x00
+#endif
+
+// Set defaults for Scaling registers
+#ifndef ISSI_SCAL_RED
+#    define ISSI_SCAL_RED 0xFF
+#endif
+#ifndef ISSI_SCAL_BLUE
+#    define ISSI_SCAL_BLUE 0xFF
+#endif
+#ifndef ISSI_SCAL_GREEN
+#    define ISSI_SCAL_GREEN 0xFF
+#endif
+#define ISSI_SCAL_RED_OFF 0x00
+#define ISSI_SCAL_GREEN_OFF 0x00
+#define ISSI_SCAL_BLUE_OFF 0x00
+
+#ifndef ISSI_SCAL_LED
+#    define ISSI_SCAL_LED 0xFF
+#endif
+#define ISSI_SCAL_LED_OFF 0x00
+
+// Set buffer sizes
+#define ISSI_MAX_LEDS 72
+#define ISSI_SCALING_SIZE 72
+#define ISSI_PWM_TRF_SIZE 18
+#define ISSI_SCALING_TRF_SIZE 18
+
+// Location of 1st bit for PWM and Scaling registers
+#define ISSI_PWM_REG_1ST 0x01
+#define ISSI_SCL_REG_1ST 0x01
+
+// Map CS SW locations to order in PWM / Scaling buffers
+// This matches the ORDER in the Datasheet Register not the POSITION
+// It will always count from 0x00 to (ISSI_MAX_LEDS - 1)
+#define CS1_SW1 0x00
+#define CS2_SW1 0x01
+#define CS3_SW1 0x02
+#define CS4_SW1 0x03
+#define CS5_SW1 0x04
+#define CS6_SW1 0x05
+#define CS7_SW1 0x06
+#define CS8_SW1 0x07
+#define CS9_SW1 0x08
+#define CS10_SW1 0x09
+#define CS11_SW1 0x0A
+#define CS12_SW1 0x0B
+#define CS13_SW1 0x0C
+#define CS14_SW1 0x0D
+#define CS15_SW1 0x0E
+#define CS16_SW1 0x0F
+#define CS17_SW1 0x10
+#define CS18_SW1 0x11
+
+#define CS1_SW2 0x12
+#define CS2_SW2 0x13
+#define CS3_SW2 0x14
+#define CS4_SW2 0x15
+#define CS5_SW2 0x16
+#define CS6_SW2 0x17
+#define CS7_SW2 0x18
+#define CS8_SW2 0x19
+#define CS9_SW2 0x1A
+#define CS10_SW2 0x1B
+#define CS11_SW2 0x1C
+#define CS12_SW2 0x1D
+#define CS13_SW2 0x1E
+#define CS14_SW2 0x1F
+#define CS15_SW2 0x20
+#define CS16_SW2 0x21
+#define CS17_SW2 0x22
+#define CS18_SW2 0x23
+
+#define CS1_SW3 0x24
+#define CS2_SW3 0x25
+#define CS3_SW3 0x26
+#define CS4_SW3 0x27
+#define CS5_SW3 0x28
+#define CS6_SW3 0x29
+#define CS7_SW3 0x2A
+#define CS8_SW3 0x2B
+#define CS9_SW3 0x2C
+#define CS10_SW3 0x2D
+#define CS11_SW3 0x2E
+#define CS12_SW3 0x2F
+#define CS13_SW3 0x30
+#define CS14_SW3 0x31
+#define CS15_SW3 0x32
+#define CS16_SW3 0x33
+#define CS17_SW3 0x34
+#define CS18_SW3 0x35
+
+#define CS1_SW4 0x36
+#define CS2_SW4 0x37
+#define CS3_SW4 0x38
+#define CS4_SW4 0x39
+#define CS5_SW4 0x3A
+#define CS6_SW4 0x3B
+#define CS7_SW4 0x3C
+#define CS8_SW4 0x3D
+#define CS9_SW4 0x3E
+#define CS10_SW4 0x3F
+#define CS11_SW4 0x40
+#define CS12_SW4 0x41
+#define CS13_SW4 0x42
+#define CS14_SW4 0x43
+#define CS15_SW4 0x44
+#define CS16_SW4 0x45
+#define CS17_SW4 0x46
+#define CS18_SW4 0x47
diff --git a/drivers/led/issi/is31flcommon.c b/drivers/led/issi/is31flcommon.c
new file mode 100644
index 0000000000..9f4b2123ff
--- /dev/null
+++ b/drivers/led/issi/is31flcommon.c
@@ -0,0 +1,230 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2020 MelGeek
+ * Copyright 2021 MasterSpoon
+ *
+ * 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 "is31flcommon.h"
+#include "i2c_master.h"
+#include "wait.h"
+#include <string.h>
+
+// Set defaults for Timeout and Persistence
+#ifndef ISSI_TIMEOUT
+#    define ISSI_TIMEOUT 100
+#endif
+#ifndef ISSI_PERSISTENCE
+#    define ISSI_PERSISTENCE 0
+#endif
+
+// Transfer buffer for TWITransmitData()
+uint8_t g_twi_transfer_buffer[20];
+
+// These buffers match the PWM & scaling registers.
+// Storing them like this is optimal for I2C transfers to the registers.
+uint8_t g_pwm_buffer[DRIVER_COUNT][ISSI_MAX_LEDS];
+bool    g_pwm_buffer_update_required[DRIVER_COUNT] = {false};
+
+uint8_t g_scaling_buffer[DRIVER_COUNT][ISSI_SCALING_SIZE];
+bool    g_scaling_buffer_update_required[DRIVER_COUNT] = {false};
+
+// For writing of single register entry
+void IS31FL_write_single_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    // Set register address and register data ready to write
+    g_twi_transfer_buffer[0] = reg;
+    g_twi_transfer_buffer[1] = data;
+
+#if ISSI_PERSISTENCE > 0
+    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0) break;
+    }
+#else
+    i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
+#endif
+}
+
+// For writing of mulitple register entries to make use of address auto increment
+// Once the controller has been called and we have written the first bit of data
+// the controller will move to the next register meaning we can write sequential blocks.
+bool IS31FL_write_multi_registers(uint8_t addr, uint8_t *source_buffer, uint8_t buffer_size, uint8_t transfer_size, uint8_t start_reg_addr) {
+    // Split the buffer into chunks to transfer
+    for (int i = 0; i < buffer_size; i += transfer_size) {
+        // Set the first entry of transfer buffer to the first register we want to write
+        g_twi_transfer_buffer[0] = i + start_reg_addr;
+        // Copy the section of our source buffer into the transfer buffer after first register address
+        memcpy(g_twi_transfer_buffer + 1, source_buffer + i, transfer_size);
+
+#if ISSI_PERSISTENCE > 0
+        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, transfer_size + 1, ISSI_TIMEOUT) != 0) {
+                return false;
+            }
+        }
+#else
+        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, transfer_size + 1, ISSI_TIMEOUT) != 0) {
+            return false;
+        }
+#endif
+    }
+    return true;
+}
+
+void IS31FL_unlock_register(uint8_t addr, uint8_t page) {
+    // unlock the command register and select Page to write
+    IS31FL_write_single_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, ISSI_REGISTER_UNLOCK);
+    IS31FL_write_single_register(addr, ISSI_COMMANDREGISTER, page);
+}
+
+void IS31FL_common_init(uint8_t addr, uint8_t ssr) {
+    // Setup phase, need to take out of software shutdown and configure
+    // ISSI_SSR_x is passed to allow Master / Slave setting where applicable
+
+    // Unlock the command register & select Function Register
+    IS31FL_unlock_register(addr, ISSI_PAGE_FUNCTION);
+    // Set Configuration Register to remove Software shutdown
+    IS31FL_write_single_register(addr, ISSI_REG_CONFIGURATION, ISSI_CONFIGURATION);
+    // Set Golbal Current Control Register
+    IS31FL_write_single_register(addr, ISSI_REG_GLOBALCURRENT, ISSI_GLOBALCURRENT);
+    // Set Pull up & Down for SWx CSy
+    IS31FL_write_single_register(addr, ISSI_REG_PULLDOWNUP, ISSI_PULLDOWNUP);
+// Set Tempature Status
+#ifdef ISSI_REG_TEMP
+    IS31FL_write_single_register(addr, ISSI_REG_TEMP, ISSI_TEMP);
+#endif
+    // Set Spread Spectrum Register, passed through as sets SYNC function
+    IS31FL_write_single_register(addr, ISSI_REG_SSR, ssr);
+// Set PWM Frequency Enable Register if applicable
+#ifdef ISSI_REG_PWM_ENABLE
+    IS31FL_write_single_register(addr, ISSI_REG_PWM_ENABLE, ISSI_PWM_ENABLE);
+#endif
+// Set PWM Frequency Register if applicable
+#ifdef ISSI_REG_PWM_SET
+    IS31FL_write_single_register(addr, ISSI_REG_PWM_SET, ISSI_PWM_SET);
+#endif
+
+    // Wait 10ms to ensure the device has woken up.
+    wait_ms(10);
+}
+
+void IS31FL_common_update_pwm_register(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        // Queue up the correct page
+        IS31FL_unlock_register(addr, ISSI_PAGE_PWM);
+        // Hand off the update to IS31FL_write_multi_registers
+        IS31FL_write_multi_registers(addr, g_pwm_buffer[index], ISSI_MAX_LEDS, ISSI_PWM_TRF_SIZE, ISSI_PWM_REG_1ST);
+        // Update flags that pwm_buffer has been updated
+        g_pwm_buffer_update_required[index] = false;
+    }
+}
+
+#ifdef ISSI_MANUAL_SCALING
+void IS31FL_set_manual_scaling_buffer(void) {
+    for (int i = 0; i < ISSI_MANUAL_SCALING; i++) {
+        is31_led scale = g_is31_scaling[i];
+        if (scale.driver >= 0 && scale.driver < DRIVER_LED_TOTAL) {
+            is31_led led = g_is31_leds[scale.driver];
+
+#    ifdef RGB_MATRIX_ENABLE
+            g_scaling_buffer[led.driver][led.r] = scale.r;
+            g_scaling_buffer[led.driver][led.g] = scale.g;
+            g_scaling_buffer[led.driver][led.b] = scale.b;
+#    elif defined(LED_MATRIX_ENABLE)
+            g_scaling_buffer[led.driver][led.v] = scale.v;
+#    endif
+            g_scaling_buffer_update_required[led.driver] = true;
+        }
+    }
+}
+#endif
+
+void IS31FL_common_update_scaling_register(uint8_t addr, uint8_t index) {
+    if (g_scaling_buffer_update_required[index]) {
+        // Queue up the correct page
+        IS31FL_unlock_register(addr, ISSI_PAGE_SCALING);
+        // Hand off the update to IS31FL_write_multi_registers
+        IS31FL_write_multi_registers(addr, g_scaling_buffer[index], ISSI_SCALING_SIZE, ISSI_SCALING_TRF_SIZE, ISSI_SCL_REG_1ST);
+        // Update flags that scaling_buffer has been updated
+        g_scaling_buffer_update_required[index] = false;
+    }
+}
+
+#ifdef RGB_MATRIX_ENABLE
+// Colour is set by adjusting PWM register
+void IS31FL_RGB_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+
+        g_pwm_buffer[led.driver][led.r]          = red;
+        g_pwm_buffer[led.driver][led.g]          = green;
+        g_pwm_buffer[led.driver][led.b]          = blue;
+        g_pwm_buffer_update_required[led.driver] = true;
+    }
+}
+
+void IS31FL_RGB_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL_RGB_set_color(i, red, green, blue);
+    }
+}
+
+// Setup Scaling register that decides the peak current of each LED
+void IS31FL_RGB_set_scaling_buffer(uint8_t index, bool red, bool green, bool blue) {
+    is31_led led = g_is31_leds[index];
+    if (red) {
+        g_scaling_buffer[led.driver][led.r] = ISSI_SCAL_RED;
+    } else {
+        g_scaling_buffer[led.driver][led.r] = ISSI_SCAL_RED_OFF;
+    }
+    if (green) {
+        g_scaling_buffer[led.driver][led.g] = ISSI_SCAL_GREEN;
+    } else {
+        g_scaling_buffer[led.driver][led.g] = ISSI_SCAL_GREEN_OFF;
+    }
+    if (blue) {
+        g_scaling_buffer[led.driver][led.b] = ISSI_SCAL_BLUE;
+    } else {
+        g_scaling_buffer[led.driver][led.b] = ISSI_SCAL_BLUE_OFF;
+    }
+    g_scaling_buffer_update_required[led.driver] = true;
+}
+
+#elif defined(LED_MATRIX_ENABLE)
+// LED Matrix Specific scripts
+void IS31FL_simple_set_scaling_buffer(uint8_t index, bool value) {
+    is31_led led = g_is31_leds[index];
+    if (value) {
+        g_scaling_buffer[led.driver][led.v] = ISSI_SCAL_LED;
+    } else {
+        g_scaling_buffer[led.driver][led.v] = ISSI_SCAL_LED_OFF;
+    }
+    g_scaling_buffer_update_required[led.driver] = true;
+}
+
+void IS31FL_simple_set_brightness(int index, uint8_t value) {
+    if (index >= 0 && index < DRIVER_LED_TOTAL) {
+        is31_led led = g_is31_leds[index];
+        g_pwm_buffer[led.driver][led.v] = value;
+        g_pwm_buffer_update_required[led.driver] = true;
+    }
+}
+
+void IS31FL_simple_set_brigntness_all(uint8_t value) {
+    for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
+        IS31FL_simple_set_brightness(i, value);
+    }
+}
+#endif
diff --git a/drivers/led/issi/is31flcommon.h b/drivers/led/issi/is31flcommon.h
new file mode 100644
index 0000000000..77e9665e32
--- /dev/null
+++ b/drivers/led/issi/is31flcommon.h
@@ -0,0 +1,78 @@
+/* Copyright 2017 Jason Williams
+ * Copyright 2018 Jack Humbert
+ * Copyright 2018 Yiancar
+ * Copyright 2020 MelGeek
+ * Copyright 2021 MasterSpoon
+ *
+ * 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 <stdint.h>
+#include <stdbool.h>
+#include "progmem.h"
+
+// Which variant header file to use
+#ifdef IS31FL3742A
+#    include "is31fl3742.h"
+#elif defined(IS31FL3743A)
+#    include "is31fl3743.h"
+#elif defined(IS31FL3745)
+#    include "is31fl3745.h"
+#elif defined(IS31FL3746A)
+#    include "is31fl3746.h"
+#endif
+
+#ifdef RGB_MATRIX_ENABLE
+typedef struct is31_led {
+    uint8_t driver;
+    uint8_t r;
+    uint8_t g;
+    uint8_t b;
+} __attribute__((packed)) is31_led;
+
+#elif defined(LED_MATRIX_ENABLE)
+typedef struct is31_led {
+    uint8_t driver;
+    uint8_t v;
+} __attribute__((packed)) is31_led;
+#endif
+
+#ifdef ISSI_MANUAL_SCALING
+extern const is31_led __flash g_is31_scaling[];
+void                          IS31FL_set_manual_scaling_buffer(void);
+#endif
+
+extern const is31_led __flash g_is31_leds[DRIVER_LED_TOTAL];
+
+void IS31FL_write_single_register(uint8_t addr, uint8_t reg, uint8_t data);
+bool IS31FL_write_multi_registers(uint8_t addr, uint8_t *source_buffer, uint8_t buffer_size, uint8_t transfer_size, uint8_t start_reg_addr);
+void IS31FL_unlock_register(uint8_t addr, uint8_t page);
+void IS31FL_common_init(uint8_t addr, uint8_t ssr);
+
+void IS31FL_common_update_pwm_register(uint8_t addr, uint8_t index);
+void IS31FL_common_update_scaling_register(uint8_t addr, uint8_t index);
+
+#ifdef RGB_MATRIX_ENABLE
+// RGB Matrix Specific scripts
+void IS31FL_RGB_set_color(int index, uint8_t red, uint8_t green, uint8_t blue);
+void IS31FL_RGB_set_color_all(uint8_t red, uint8_t green, uint8_t blue);
+void IS31FL_RGB_set_scaling_buffer(uint8_t index, bool red, bool green, bool blue);
+#elif defined(LED_MATRIX_ENABLE)
+// LED Matrix Specific scripts
+void IS31FL_simple_set_scaling_buffer(uint8_t index, bool value);
+void IS31FL_simple_set_brightness(int index, uint8_t value);
+void IS31FL_simple_set_brigntness_all(uint8_t value);
+#endif