LED drivers: extract IS31FL3746A from IS31COMMON (#22637)

11 files changed, 828 insertions, 207 deletions

diff --git a/builddefs/common_features.mk b/builddefs/common_features.mk
index d5446a54c8..cfdc63f1d4 100644
--- a/builddefs/common_features.mk
+++ b/builddefs/common_features.mk
@@ -414,10 +414,9 @@ ifeq ($(strip $(LED_MATRIX_ENABLE)), yes)
     endif
 
     ifeq ($(strip $(LED_MATRIX_DRIVER)), is31fl3746a)
-        OPT_DEFS += -DIS31FLCOMMON
         I2C_DRIVER_REQUIRED = yes
         COMMON_VPATH += $(DRIVER_PATH)/led/issi
-        SRC += is31flcommon.c
+        SRC += is31fl3746a-simple.c
     endif
 
     ifeq ($(strip $(LED_MATRIX_DRIVER)), snled27351)
@@ -518,10 +517,9 @@ ifeq ($(strip $(RGB_MATRIX_ENABLE)), yes)
     endif
 
     ifeq ($(strip $(RGB_MATRIX_DRIVER)), is31fl3746a)
-        OPT_DEFS += -DIS31FLCOMMON
         I2C_DRIVER_REQUIRED = yes
         COMMON_VPATH += $(DRIVER_PATH)/led/issi
-        SRC += is31flcommon.c
+        SRC += is31fl3746a.c
     endif
 
     ifeq ($(strip $(RGB_MATRIX_DRIVER)), snled27351)
diff --git a/drivers/led/issi/is31fl3746.h b/drivers/led/issi/is31fl3746.h
deleted file mode 100644
index f89f281533..0000000000
--- a/drivers/led/issi/is31fl3746.h
+++ /dev/null
@@ -1,198 +0,0 @@
-/* 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/is31fl3746a-simple.c b/drivers/led/issi/is31fl3746a-simple.c
new file mode 100644
index 0000000000..3a29c511cb
--- /dev/null
+++ b/drivers/led/issi/is31fl3746a-simple.c
@@ -0,0 +1,208 @@
+#include "is31fl3746a-simple.h"
+#include <string.h>
+#include "i2c_master.h"
+#include "wait.h"
+
+#define IS31FL3746A_PWM_REGISTER_COUNT 72
+#define IS31FL3746A_SCALING_REGISTER_COUNT 72
+
+#ifndef IS31FL3746A_I2C_TIMEOUT
+#    define IS31FL3746A_I2C_TIMEOUT 100
+#endif
+
+#ifndef IS31FL3746A_I2C_PERSISTENCE
+#    define IS31FL3746A_I2C_PERSISTENCE 0
+#endif
+
+#ifndef IS31FL3746A_CONFIGURATION
+#    define IS31FL3746A_CONFIGURATION 0x01
+#endif
+
+#ifndef IS31FL3746A_PWM_FREQUENCY
+#    define IS31FL3746A_PWM_FREQUENCY IS31FL3746A_PWM_FREQUENCY_29K_HZ
+#endif
+
+#ifndef IS31FL3746A_SW_PULLDOWN
+#    define IS31FL3746A_SW_PULLDOWN IS31FL3746A_PDR_2K_OHM_SW_OFF
+#endif
+
+#ifndef IS31FL3746A_CS_PULLUP
+#    define IS31FL3746A_CS_PULLUP IS31FL3746A_PUR_2K_OHM_CS_OFF
+#endif
+
+#ifndef IS31FL3746A_GLOBAL_CURRENT
+#    define IS31FL3746A_GLOBAL_CURRENT 0xFF
+#endif
+
+uint8_t i2c_transfer_buffer[20] = {0xFF};
+
+uint8_t g_pwm_buffer[IS31FL3746A_DRIVER_COUNT][IS31FL3746A_PWM_REGISTER_COUNT];
+bool    g_pwm_buffer_update_required[IS31FL3746A_DRIVER_COUNT]        = {false};
+bool    g_scaling_registers_update_required[IS31FL3746A_DRIVER_COUNT] = {false};
+
+uint8_t g_scaling_registers[IS31FL3746A_DRIVER_COUNT][IS31FL3746A_SCALING_REGISTER_COUNT];
+
+void is31fl3746a_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    i2c_transfer_buffer[0] = reg;
+    i2c_transfer_buffer[1] = data;
+
+#if IS31FL3746A_I2C_PERSISTENCE > 0
+    for (uint8_t i = 0; i < IS31FL3746A_I2C_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, i2c_transfer_buffer, 2, IS31FL3746A_I2C_TIMEOUT) == 0) break;
+    }
+#else
+    i2c_transmit(addr << 1, i2c_transfer_buffer, 2, IS31FL3746A_I2C_TIMEOUT);
+#endif
+}
+
+void is31fl3746a_select_page(uint8_t addr, uint8_t page) {
+    is31fl3746a_write_register(addr, IS31FL3746A_REG_COMMAND_WRITE_LOCK, IS31FL3746A_COMMAND_WRITE_LOCK_MAGIC);
+    is31fl3746a_write_register(addr, IS31FL3746A_REG_COMMAND, page);
+}
+
+void is31fl3746a_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // Assumes page 0 is already selected.
+    // If any of the transactions fails function returns false.
+    // Transmit PWM registers in 12 transfers of 16 bytes.
+    // i2c_transfer_buffer[] is 20 bytes
+
+    // Iterate over the pwm_buffer contents at 16 byte intervals.
+    for (int i = 0; i < IS31FL3746A_PWM_REGISTER_COUNT; i += 16) {
+        i2c_transfer_buffer[0] = i + 1;
+        // 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.
+        memcpy(i2c_transfer_buffer + 1, pwm_buffer + i, 16);
+
+#if IS31FL3746A_I2C_PERSISTENCE > 0
+        for (uint8_t i = 0; i < IS31FL3746A_I2C_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, i2c_transfer_buffer, 17, IS31FL3746A_I2C_TIMEOUT) != 0) break;
+        }
+#else
+        i2c_transmit(addr << 1, i2c_transfer_buffer, 17, IS31FL3746A_I2C_TIMEOUT);
+#endif
+    }
+}
+
+void is31fl3746a_init_drivers(void) {
+    i2c_init();
+
+    is31fl3746a_init(IS31FL3746A_I2C_ADDRESS_1);
+#if defined(IS31FL3746A_I2C_ADDRESS_2)
+    is31fl3746a_init(IS31FL3746A_I2C_ADDRESS_2);
+#    if defined(IS31FL3746A_I2C_ADDRESS_3)
+    is31fl3746a_init(IS31FL3746A_I2C_ADDRESS_3);
+#        if defined(IS31FL3746A_I2C_ADDRESS_4)
+    is31fl3746a_init(IS31FL3746A_I2C_ADDRESS_4);
+#        endif
+#    endif
+#endif
+
+    for (int i = 0; i < IS31FL3746A_LED_COUNT; i++) {
+        is31fl3746a_set_scaling_register(i, 0xFF);
+    }
+
+    is31fl3746a_update_scaling_registers(IS31FL3746A_I2C_ADDRESS_1, 0);
+#if defined(IS31FL3746A_I2C_ADDRESS_2)
+    is31fl3746a_update_scaling_registers(IS31FL3746A_I2C_ADDRESS_2, 1);
+#    if defined(IS31FL3746A_I2C_ADDRESS_3)
+    is31fl3746a_update_scaling_registers(IS31FL3746A_I2C_ADDRESS_3, 2);
+#        if defined(IS31FL3746A_I2C_ADDRESS_4)
+    is31fl3746a_update_scaling_registers(IS31FL3746A_I2C_ADDRESS_4, 3);
+#        endif
+#    endif
+#endif
+}
+
+void is31fl3746a_init(uint8_t addr) {
+    // 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.
+
+    is31fl3746a_select_page(addr, IS31FL3746A_COMMAND_SCALING);
+
+    // Turn off all LEDs.
+    for (int i = 0; i < IS31FL3746A_SCALING_REGISTER_COUNT; i++) {
+        is31fl3746a_write_register(addr, i + 1, 0x00);
+    }
+
+    is31fl3746a_select_page(addr, IS31FL3746A_COMMAND_PWM);
+
+    for (int i = 0; i < IS31FL3746A_PWM_REGISTER_COUNT; i++) {
+        is31fl3746a_write_register(addr, i + 1, 0x00);
+    }
+
+    is31fl3746a_select_page(addr, IS31FL3746A_COMMAND_FUNCTION);
+
+    is31fl3746a_write_register(addr, IS31FL3746A_FUNCTION_REG_PULLDOWNUP, (IS31FL3746A_SW_PULLDOWN << 4) | IS31FL3746A_CS_PULLUP);
+    is31fl3746a_write_register(addr, IS31FL3746A_FUNCTION_REG_GLOBAL_CURRENT, IS31FL3746A_GLOBAL_CURRENT);
+    is31fl3746a_write_register(addr, IS31FL3746A_FUNCTION_REG_PWM_ENABLE, 0x01);
+    is31fl3746a_write_register(addr, IS31FL3746A_FUNCTION_REG_PWM_FREQUENCY, IS31FL3746A_PWM_FREQUENCY);
+    is31fl3746a_write_register(addr, IS31FL3746A_FUNCTION_REG_CONFIGURATION, IS31FL3746A_CONFIGURATION);
+
+    // Wait 10ms to ensure the device has woken up.
+    wait_ms(10);
+}
+
+void is31fl3746a_set_color(int index, uint8_t value) {
+    is31fl3746a_led_t led;
+    if (index >= 0 && index < IS31FL3746A_LED_COUNT) {
+        memcpy_P(&led, (&g_is31fl3746a_leds[index]), sizeof(led));
+
+        if (g_pwm_buffer[led.driver][led.v] == value) {
+            return;
+        }
+        g_pwm_buffer_update_required[led.driver] = true;
+        g_pwm_buffer[led.driver][led.v]          = value;
+    }
+}
+
+void is31fl3746a_set_value_all(uint8_t value) {
+    for (int i = 0; i < IS31FL3746A_LED_COUNT; i++) {
+        is31fl3746a_set_value(i, value);
+    }
+}
+
+void is31fl3746a_set_scaling_register(uint8_t index, uint8_t value) {
+    is31fl3746a_led_t led;
+    memcpy_P(&led, (&g_is31fl3746a_leds[index]), sizeof(led));
+
+    g_scaling_registers[led.driver][led.v] = value;
+
+    g_scaling_registers_update_required[led.driver] = true;
+}
+
+void is31fl3746a_update_pwm_buffers(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        is31fl3746a_select_page(addr, IS31FL3746A_COMMAND_PWM);
+
+        is31fl3746a_write_pwm_buffer(addr, g_pwm_buffer[index]);
+    }
+
+    g_pwm_buffer_update_required[index] = false;
+}
+
+void is31fl3746a_update_scaling_registers(uint8_t addr, uint8_t index) {
+    if (g_scaling_registers_update_required[index]) {
+        is31fl3746a_select_page(addr, IS31FL3746A_COMMAND_SCALING);
+
+        for (int i = 0; i < IS31FL3746A_SCALING_REGISTER_COUNT; i++) {
+            is31fl3746a_write_register(addr, i + 1, g_scaling_registers[index][i]);
+        }
+        g_scaling_registers_update_required[index] = false;
+    }
+}
+
+void is31fl3746a_flush(void) {
+    is31fl3746a_update_pwm_buffers(IS31FL3746A_I2C_ADDRESS_1, 0);
+#if defined(IS31FL3746A_I2C_ADDRESS_2)
+    is31fl3746a_update_pwm_buffers(IS31FL3746A_I2C_ADDRESS_2, 1);
+#    if defined(IS31FL3746A_I2C_ADDRESS_3)
+    is31fl3746a_update_pwm_buffers(IS31FL3746A_I2C_ADDRESS_3, 2);
+#        if defined(IS31FL3746A_I2C_ADDRESS_4)
+    is31fl3746a_update_pwm_buffers(IS31FL3746A_I2C_ADDRESS_4, 3);
+#        endif
+#    endif
+#endif
+}
diff --git a/drivers/led/issi/is31fl3746a-simple.h b/drivers/led/issi/is31fl3746a-simple.h
new file mode 100644
index 0000000000..eda644ad19
--- /dev/null
+++ b/drivers/led/issi/is31fl3746a-simple.h
@@ -0,0 +1,192 @@
+/* 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"
+#include "util.h"
+
+#define IS31FL3746A_REG_ID 0xFC
+
+#define IS31FL3746A_REG_COMMAND 0xFD
+
+#define IS31FL3746A_COMMAND_PWM 0x00
+#define IS31FL3746A_COMMAND_SCALING 0x01
+#define IS31FL3746A_COMMAND_FUNCTION 0x01
+
+#define IS31FL3746A_FUNCTION_REG_CONFIGURATION 0x50
+#define IS31FL3746A_FUNCTION_REG_GLOBAL_CURRENT 0x51
+#define IS31FL3746A_FUNCTION_REG_PULLDOWNUP 0x52
+#define IS31FL3746A_FUNCTION_REG_TEMPERATURE 0x5F
+#define IS31FL3746A_FUNCTION_REG_SPREAD_SPECTRUM 0x60
+#define IS31FL3746A_FUNCTION_REG_RESET 0x8F
+#define IS31FL3746A_FUNCTION_REG_PWM_ENABLE 0xE0
+#define IS31FL3746A_FUNCTION_REG_PWM_FREQUENCY 0xE2
+
+#define IS31FL3746A_REG_COMMAND_WRITE_LOCK 0xFE
+#define IS31FL3746A_COMMAND_WRITE_LOCK_MAGIC 0xC5
+
+#define IS31FL3746A_I2C_ADDRESS_GND_GND 0x60
+#define IS31FL3746A_I2C_ADDRESS_GND_SCL 0x61
+#define IS31FL3746A_I2C_ADDRESS_GND_SDA 0x62
+#define IS31FL3746A_I2C_ADDRESS_GND_VCC 0x63
+#define IS31FL3746A_I2C_ADDRESS_SCL_GND 0x64
+#define IS31FL3746A_I2C_ADDRESS_SCL_SCL 0x65
+#define IS31FL3746A_I2C_ADDRESS_SCL_SDA 0x66
+#define IS31FL3746A_I2C_ADDRESS_SCL_VCC 0x67
+#define IS31FL3746A_I2C_ADDRESS_SDA_GND 0x68
+#define IS31FL3746A_I2C_ADDRESS_SDA_SCL 0x69
+#define IS31FL3746A_I2C_ADDRESS_SDA_SDA 0x6A
+#define IS31FL3746A_I2C_ADDRESS_SDA_VCC 0x6B
+#define IS31FL3746A_I2C_ADDRESS_VCC_GND 0x6C
+#define IS31FL3746A_I2C_ADDRESS_VCC_SCL 0x6D
+#define IS31FL3746A_I2C_ADDRESS_VCC_SDA 0x6E
+#define IS31FL3746A_I2C_ADDRESS_VCC_VCC 0x6F
+
+#if defined(LED_MATRIX_IS31FL3746A)
+#    define IS31FL3746A_LED_COUNT LED_MATRIX_LED_COUNT
+#endif
+
+typedef struct is31fl3746a_led_t {
+    uint8_t driver : 2;
+    uint8_t v;
+} PACKED is31fl3746a_led_t;
+
+extern const is31fl3746a_led_t PROGMEM g_is31fl3746a_leds[IS31FL3746A_LED_COUNT];
+
+void is31fl3746a_init_drivers(void);
+void is31fl3746a_init(uint8_t addr, uint8_t sync);
+void is31fl3746a_write_register(uint8_t addr, uint8_t reg, uint8_t data);
+void is31fl3746a_select_page(uint8_t addr, uint8_t page);
+void is31fl3746a_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer);
+
+void is31fl3746a_set_value(int index, uint8_t value);
+void is31fl3746a_set_value_all(uint8_t value);
+
+void is31fl3746a_set_scaling_register(uint8_t index, uint8_t value);
+
+void is31fl3746a_update_pwm_buffers(uint8_t addr, uint8_t index);
+void is31fl3746a_update_scaling_registers(uint8_t addr, uint8_t index);
+
+void is31fl3746a_flush(void);
+
+#define IS31FL3746A_PDR_0_OHM 0b000          // No pull-down resistor
+#define IS31FL3746A_PDR_0K5_OHM_SW_OFF 0b001 // 0.5 kOhm resistor in SWx off time
+#define IS31FL3746A_PDR_1K_OHM_SW_OFF 0b010  // 1 kOhm resistor in SWx off time
+#define IS31FL3746A_PDR_2K_OHM_SW_OFF 0b011  // 2 kOhm resistor in SWx off time
+#define IS31FL3746A_PDR_1K_OHM 0b100         // 1 kOhm resistor
+#define IS31FL3746A_PDR_2K_OHM 0b101         // 2 kOhm resistor
+#define IS31FL3746A_PDR_4K_OHM 0b110         // 4 kOhm resistor
+#define IS31FL3746A_PDR_8K_OHM 0b111         // 8 kOhm resistor
+
+#define IS31FL3746A_PUR_0_OHM 0b000          // No pull-up resistor
+#define IS31FL3746A_PUR_0K5_OHM_CS_OFF 0b001 // 0.5 kOhm resistor in CSy off time
+#define IS31FL3746A_PUR_1K_OHM_CS_OFF 0b010  // 1 kOhm resistor in CSy off time
+#define IS31FL3746A_PUR_2K_OHM_CS_OFF 0b011  // 2 kOhm resistor in CSy off time
+#define IS31FL3746A_PUR_1K_OHM 0b100         // 1 kOhm resistor
+#define IS31FL3746A_PUR_2K_OHM 0b101         // 2 kOhm resistor
+#define IS31FL3746A_PUR_4K_OHM 0b110         // 4 kOhm resistor
+#define IS31FL3746A_PUR_8K_OHM 0b111         // 8 kOhm resistor
+
+#define IS31FL3746A_PWM_FREQUENCY_29K_HZ 0b000
+#define IS31FL3746A_PWM_FREQUENCY_14K5_HZ 0b001
+#define IS31FL3746A_PWM_FREQUENCY_7K25_HZ 0b010
+#define IS31FL3746A_PWM_FREQUENCY_3K63_HZ 0b011
+#define IS31FL3746A_PWM_FREQUENCY_1K81_HZ 0b100
+#define IS31FL3746A_PWM_FREQUENCY_906_HZ 0b101
+#define IS31FL3746A_PWM_FREQUENCY_453_HZ 0b110
+
+#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/is31fl3746a.c b/drivers/led/issi/is31fl3746a.c
new file mode 100644
index 0000000000..5a3001f02f
--- /dev/null
+++ b/drivers/led/issi/is31fl3746a.c
@@ -0,0 +1,212 @@
+#include "is31fl3746a.h"
+#include <string.h>
+#include "i2c_master.h"
+#include "wait.h"
+
+#define IS31FL3746A_PWM_REGISTER_COUNT 72
+#define IS31FL3746A_SCALING_REGISTER_COUNT 72
+
+#ifndef IS31FL3746A_I2C_TIMEOUT
+#    define IS31FL3746A_I2C_TIMEOUT 100
+#endif
+
+#ifndef IS31FL3746A_I2C_PERSISTENCE
+#    define IS31FL3746A_I2C_PERSISTENCE 0
+#endif
+
+#ifndef IS31FL3746A_CONFIGURATION
+#    define IS31FL3746A_CONFIGURATION 0x01
+#endif
+
+#ifndef IS31FL3746A_PWM_FREQUENCY
+#    define IS31FL3746A_PWM_FREQUENCY IS31FL3746A_PWM_FREQUENCY_29K_HZ
+#endif
+
+#ifndef IS31FL3746A_SW_PULLDOWN
+#    define IS31FL3746A_SW_PULLDOWN IS31FL3746A_PDR_2K_OHM_SW_OFF
+#endif
+
+#ifndef IS31FL3746A_CS_PULLUP
+#    define IS31FL3746A_CS_PULLUP IS31FL3746A_PUR_2K_OHM_CS_OFF
+#endif
+
+#ifndef IS31FL3746A_GLOBAL_CURRENT
+#    define IS31FL3746A_GLOBAL_CURRENT 0xFF
+#endif
+
+uint8_t i2c_transfer_buffer[20] = {0xFF};
+
+uint8_t g_pwm_buffer[IS31FL3746A_DRIVER_COUNT][IS31FL3746A_PWM_REGISTER_COUNT];
+bool    g_pwm_buffer_update_required[IS31FL3746A_DRIVER_COUNT]        = {false};
+bool    g_scaling_registers_update_required[IS31FL3746A_DRIVER_COUNT] = {false};
+
+uint8_t g_scaling_registers[IS31FL3746A_DRIVER_COUNT][IS31FL3746A_SCALING_REGISTER_COUNT];
+
+void is31fl3746a_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
+    i2c_transfer_buffer[0] = reg;
+    i2c_transfer_buffer[1] = data;
+
+#if IS31FL3746A_I2C_PERSISTENCE > 0
+    for (uint8_t i = 0; i < IS31FL3746A_I2C_PERSISTENCE; i++) {
+        if (i2c_transmit(addr << 1, i2c_transfer_buffer, 2, IS31FL3746A_I2C_TIMEOUT) == 0) break;
+    }
+#else
+    i2c_transmit(addr << 1, i2c_transfer_buffer, 2, IS31FL3746A_I2C_TIMEOUT);
+#endif
+}
+
+void is31fl3746a_select_page(uint8_t addr, uint8_t page) {
+    is31fl3746a_write_register(addr, IS31FL3746A_REG_COMMAND_WRITE_LOCK, IS31FL3746A_COMMAND_WRITE_LOCK_MAGIC);
+    is31fl3746a_write_register(addr, IS31FL3746A_REG_COMMAND, page);
+}
+
+void is31fl3746a_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
+    // Assumes page 0 is already selected.
+    // If any of the transactions fails function returns false.
+    // Transmit PWM registers in 12 transfers of 16 bytes.
+    // i2c_transfer_buffer[] is 20 bytes
+
+    // Iterate over the pwm_buffer contents at 16 byte intervals.
+    for (int i = 0; i < IS31FL3746A_PWM_REGISTER_COUNT; i += 16) {
+        i2c_transfer_buffer[0] = i + 1;
+        // 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.
+        memcpy(i2c_transfer_buffer + 1, pwm_buffer + i, 16);
+
+#if IS31FL3746A_I2C_PERSISTENCE > 0
+        for (uint8_t i = 0; i < IS31FL3746A_I2C_PERSISTENCE; i++) {
+            if (i2c_transmit(addr << 1, i2c_transfer_buffer, 17, IS31FL3746A_I2C_TIMEOUT) != 0) break;
+        }
+#else
+        i2c_transmit(addr << 1, i2c_transfer_buffer, 17, IS31FL3746A_I2C_TIMEOUT);
+#endif
+    }
+}
+
+void is31fl3746a_init_drivers(void) {
+    i2c_init();
+
+    is31fl3746a_init(IS31FL3746A_I2C_ADDRESS_1);
+#if defined(IS31FL3746A_I2C_ADDRESS_2)
+    is31fl3746a_init(IS31FL3746A_I2C_ADDRESS_2);
+#    if defined(IS31FL3746A_I2C_ADDRESS_3)
+    is31fl3746a_init(IS31FL3746A_I2C_ADDRESS_3);
+#        if defined(IS31FL3746A_I2C_ADDRESS_4)
+    is31fl3746a_init(IS31FL3746A_I2C_ADDRESS_4);
+#        endif
+#    endif
+#endif
+
+    for (int i = 0; i < IS31FL3746A_LED_COUNT; i++) {
+        is31fl3746a_set_scaling_register(i, 0xFF, 0xFF, 0xFF);
+    }
+
+    is31fl3746a_update_scaling_registers(IS31FL3746A_I2C_ADDRESS_1, 0);
+#if defined(IS31FL3746A_I2C_ADDRESS_2)
+    is31fl3746a_update_scaling_registers(IS31FL3746A_I2C_ADDRESS_2, 1);
+#    if defined(IS31FL3746A_I2C_ADDRESS_3)
+    is31fl3746a_update_scaling_registers(IS31FL3746A_I2C_ADDRESS_3, 2);
+#        if defined(IS31FL3746A_I2C_ADDRESS_4)
+    is31fl3746a_update_scaling_registers(IS31FL3746A_I2C_ADDRESS_4, 3);
+#        endif
+#    endif
+#endif
+}
+
+void is31fl3746a_init(uint8_t addr) {
+    // 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.
+
+    is31fl3746a_select_page(addr, IS31FL3746A_COMMAND_SCALING);
+
+    // Turn off all LEDs.
+    for (int i = 0; i < IS31FL3746A_SCALING_REGISTER_COUNT; i++) {
+        is31fl3746a_write_register(addr, i + 1, 0x00);
+    }
+
+    is31fl3746a_select_page(addr, IS31FL3746A_COMMAND_PWM);
+
+    for (int i = 0; i < IS31FL3746A_PWM_REGISTER_COUNT; i++) {
+        is31fl3746a_write_register(addr, i + 1, 0x00);
+    }
+
+    is31fl3746a_select_page(addr, IS31FL3746A_COMMAND_FUNCTION);
+
+    is31fl3746a_write_register(addr, IS31FL3746A_FUNCTION_REG_PULLDOWNUP, (IS31FL3746A_SW_PULLDOWN << 4) | IS31FL3746A_CS_PULLUP);
+    is31fl3746a_write_register(addr, IS31FL3746A_FUNCTION_REG_GLOBAL_CURRENT, IS31FL3746A_GLOBAL_CURRENT);
+    is31fl3746a_write_register(addr, IS31FL3746A_FUNCTION_REG_PWM_ENABLE, 0x01);
+    is31fl3746a_write_register(addr, IS31FL3746A_FUNCTION_REG_PWM_FREQUENCY, IS31FL3746A_PWM_FREQUENCY);
+    is31fl3746a_write_register(addr, IS31FL3746A_FUNCTION_REG_CONFIGURATION, IS31FL3746A_CONFIGURATION);
+
+    // Wait 10ms to ensure the device has woken up.
+    wait_ms(10);
+}
+
+void is31fl3746a_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
+    is31fl3746a_led_t led;
+    if (index >= 0 && index < IS31FL3746A_LED_COUNT) {
+        memcpy_P(&led, (&g_is31fl3746a_leds[index]), sizeof(led));
+
+        if (g_pwm_buffer[led.driver][led.r] == red && g_pwm_buffer[led.driver][led.g] == green && g_pwm_buffer[led.driver][led.b] == blue) {
+            return;
+        }
+        g_pwm_buffer_update_required[led.driver] = true;
+        g_pwm_buffer[led.driver][led.r]          = red;
+        g_pwm_buffer[led.driver][led.g]          = green;
+        g_pwm_buffer[led.driver][led.b]          = blue;
+    }
+}
+
+void is31fl3746a_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
+    for (int i = 0; i < IS31FL3746A_LED_COUNT; i++) {
+        is31fl3746a_set_color(i, red, green, blue);
+    }
+}
+
+void is31fl3746a_set_scaling_register(uint8_t index, uint8_t red, uint8_t green, uint8_t blue) {
+    is31fl3746a_led_t led;
+    memcpy_P(&led, (&g_is31fl3746a_leds[index]), sizeof(led));
+
+    g_scaling_registers[led.driver][led.r] = red;
+    g_scaling_registers[led.driver][led.g] = green;
+    g_scaling_registers[led.driver][led.b] = blue;
+
+    g_scaling_registers_update_required[led.driver] = true;
+}
+
+void is31fl3746a_update_pwm_buffers(uint8_t addr, uint8_t index) {
+    if (g_pwm_buffer_update_required[index]) {
+        is31fl3746a_select_page(addr, IS31FL3746A_COMMAND_PWM);
+
+        is31fl3746a_write_pwm_buffer(addr, g_pwm_buffer[index]);
+    }
+
+    g_pwm_buffer_update_required[index] = false;
+}
+
+void is31fl3746a_update_scaling_registers(uint8_t addr, uint8_t index) {
+    if (g_scaling_registers_update_required[index]) {
+        is31fl3746a_select_page(addr, IS31FL3746A_COMMAND_SCALING);
+
+        for (int i = 0; i < IS31FL3746A_SCALING_REGISTER_COUNT; i++) {
+            is31fl3746a_write_register(addr, i + 1, g_scaling_registers[index][i]);
+        }
+        g_scaling_registers_update_required[index] = false;
+    }
+}
+
+void is31fl3746a_flush(void) {
+    is31fl3746a_update_pwm_buffers(IS31FL3746A_I2C_ADDRESS_1, 0);
+#if defined(IS31FL3746A_I2C_ADDRESS_2)
+    is31fl3746a_update_pwm_buffers(IS31FL3746A_I2C_ADDRESS_2, 1);
+#    if defined(IS31FL3746A_I2C_ADDRESS_3)
+    is31fl3746a_update_pwm_buffers(IS31FL3746A_I2C_ADDRESS_3, 2);
+#        if defined(IS31FL3746A_I2C_ADDRESS_4)
+    is31fl3746a_update_pwm_buffers(IS31FL3746A_I2C_ADDRESS_4, 3);
+#        endif
+#    endif
+#endif
+}
diff --git a/drivers/led/issi/is31fl3746a.h b/drivers/led/issi/is31fl3746a.h
new file mode 100644
index 0000000000..f335e98e82
--- /dev/null
+++ b/drivers/led/issi/is31fl3746a.h
@@ -0,0 +1,194 @@
+/* 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"
+#include "util.h"
+
+#define IS31FL3746A_REG_ID 0xFC
+
+#define IS31FL3746A_REG_COMMAND 0xFD
+
+#define IS31FL3746A_COMMAND_PWM 0x00
+#define IS31FL3746A_COMMAND_SCALING 0x01
+#define IS31FL3746A_COMMAND_FUNCTION 0x01
+
+#define IS31FL3746A_FUNCTION_REG_CONFIGURATION 0x50
+#define IS31FL3746A_FUNCTION_REG_GLOBAL_CURRENT 0x51
+#define IS31FL3746A_FUNCTION_REG_PULLDOWNUP 0x52
+#define IS31FL3746A_FUNCTION_REG_TEMPERATURE 0x5F
+#define IS31FL3746A_FUNCTION_REG_SPREAD_SPECTRUM 0x60
+#define IS31FL3746A_FUNCTION_REG_RESET 0x8F
+#define IS31FL3746A_FUNCTION_REG_PWM_ENABLE 0xE0
+#define IS31FL3746A_FUNCTION_REG_PWM_FREQUENCY 0xE2
+
+#define IS31FL3746A_REG_COMMAND_WRITE_LOCK 0xFE
+#define IS31FL3746A_COMMAND_WRITE_LOCK_MAGIC 0xC5
+
+#define IS31FL3746A_I2C_ADDRESS_GND_GND 0x60
+#define IS31FL3746A_I2C_ADDRESS_GND_SCL 0x61
+#define IS31FL3746A_I2C_ADDRESS_GND_SDA 0x62
+#define IS31FL3746A_I2C_ADDRESS_GND_VCC 0x63
+#define IS31FL3746A_I2C_ADDRESS_SCL_GND 0x64
+#define IS31FL3746A_I2C_ADDRESS_SCL_SCL 0x65
+#define IS31FL3746A_I2C_ADDRESS_SCL_SDA 0x66
+#define IS31FL3746A_I2C_ADDRESS_SCL_VCC 0x67
+#define IS31FL3746A_I2C_ADDRESS_SDA_GND 0x68
+#define IS31FL3746A_I2C_ADDRESS_SDA_SCL 0x69
+#define IS31FL3746A_I2C_ADDRESS_SDA_SDA 0x6A
+#define IS31FL3746A_I2C_ADDRESS_SDA_VCC 0x6B
+#define IS31FL3746A_I2C_ADDRESS_VCC_GND 0x6C
+#define IS31FL3746A_I2C_ADDRESS_VCC_SCL 0x6D
+#define IS31FL3746A_I2C_ADDRESS_VCC_SDA 0x6E
+#define IS31FL3746A_I2C_ADDRESS_VCC_VCC 0x6F
+
+#if defined(RGB_MATRIX_IS31FL3746A)
+#    define IS31FL3746A_LED_COUNT RGB_MATRIX_LED_COUNT
+#endif
+
+typedef struct is31fl3746a_led_t {
+    uint8_t driver : 2;
+    uint8_t r;
+    uint8_t g;
+    uint8_t b;
+} PACKED is31fl3746a_led_t;
+
+extern const is31fl3746a_led_t PROGMEM g_is31fl3746a_leds[IS31FL3746A_LED_COUNT];
+
+void is31fl3746a_init_drivers(void);
+void is31fl3746a_init(uint8_t addr, uint8_t sync);
+void is31fl3746a_write_register(uint8_t addr, uint8_t reg, uint8_t data);
+void is31fl3746a_select_page(uint8_t addr, uint8_t page);
+void is31fl3746a_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer);
+
+void is31fl3746a_set_color(int index, uint8_t red, uint8_t green, uint8_t blue);
+void is31fl3746a_set_color_all(uint8_t red, uint8_t green, uint8_t blue);
+
+void is31fl3746a_set_scaling_register(uint8_t index, uint8_t red, uint8_t green, uint8_t blue);
+
+void is31fl3746a_update_pwm_buffers(uint8_t addr, uint8_t index);
+void is31fl3746a_update_scaling_registers(uint8_t addr, uint8_t index);
+
+void is31fl3746a_flush(void);
+
+#define IS31FL3746A_PDR_0_OHM 0b000          // No pull-down resistor
+#define IS31FL3746A_PDR_0K5_OHM_SW_OFF 0b001 // 0.5 kOhm resistor in SWx off time
+#define IS31FL3746A_PDR_1K_OHM_SW_OFF 0b010  // 1 kOhm resistor in SWx off time
+#define IS31FL3746A_PDR_2K_OHM_SW_OFF 0b011  // 2 kOhm resistor in SWx off time
+#define IS31FL3746A_PDR_1K_OHM 0b100         // 1 kOhm resistor
+#define IS31FL3746A_PDR_2K_OHM 0b101         // 2 kOhm resistor
+#define IS31FL3746A_PDR_4K_OHM 0b110         // 4 kOhm resistor
+#define IS31FL3746A_PDR_8K_OHM 0b111         // 8 kOhm resistor
+
+#define IS31FL3746A_PUR_0_OHM 0b000          // No pull-up resistor
+#define IS31FL3746A_PUR_0K5_OHM_CS_OFF 0b001 // 0.5 kOhm resistor in CSy off time
+#define IS31FL3746A_PUR_1K_OHM_CS_OFF 0b010  // 1 kOhm resistor in CSy off time
+#define IS31FL3746A_PUR_2K_OHM_CS_OFF 0b011  // 2 kOhm resistor in CSy off time
+#define IS31FL3746A_PUR_1K_OHM 0b100         // 1 kOhm resistor
+#define IS31FL3746A_PUR_2K_OHM 0b101         // 2 kOhm resistor
+#define IS31FL3746A_PUR_4K_OHM 0b110         // 4 kOhm resistor
+#define IS31FL3746A_PUR_8K_OHM 0b111         // 8 kOhm resistor
+
+#define IS31FL3746A_PWM_FREQUENCY_29K_HZ 0b000
+#define IS31FL3746A_PWM_FREQUENCY_14K5_HZ 0b001
+#define IS31FL3746A_PWM_FREQUENCY_7K25_HZ 0b010
+#define IS31FL3746A_PWM_FREQUENCY_3K63_HZ 0b011
+#define IS31FL3746A_PWM_FREQUENCY_1K81_HZ 0b100
+#define IS31FL3746A_PWM_FREQUENCY_906_HZ 0b101
+#define IS31FL3746A_PWM_FREQUENCY_453_HZ 0b110
+
+#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.h b/drivers/led/issi/is31flcommon.h
index e5c4c52125..db7cd24b48 100644
--- a/drivers/led/issi/is31flcommon.h
+++ b/drivers/led/issi/is31flcommon.h
@@ -25,11 +25,6 @@
 #include "progmem.h"
 #include "util.h"
 
-// Which variant header file to use
-#if defined(LED_MATRIX_IS31FL3746A) || defined(RGB_MATRIX_IS31FL3746A)
-#    include "is31fl3746.h"
-#endif
-
 #if defined DRIVER_ADDR_4
 #    define DRIVER_COUNT 4
 #elif defined DRIVER_ADDR_3
diff --git a/quantum/led_matrix/led_matrix_drivers.c b/quantum/led_matrix/led_matrix_drivers.c
index f244ae30e9..73e2513a11 100644
--- a/quantum/led_matrix/led_matrix_drivers.c
+++ b/quantum/led_matrix/led_matrix_drivers.c
@@ -97,6 +97,14 @@ const led_matrix_driver_t led_matrix_driver = {
     .set_value_all = is31fl3745_set_value_all,
 };
 
+#elif defined(LED_MATRIX_IS31FL3746A)
+const led_matrix_driver_t led_matrix_driver = {
+    .init          = is31fl3746a_init_drivers,
+    .flush         = is31fl3746a_flush,
+    .set_value     = is31fl3746a_set_value,
+    .set_value_all = is31fl3746a_set_value_all,
+};
+
 #elif defined(IS31FLCOMMON)
 const led_matrix_driver_t led_matrix_driver = {
     .init          = IS31FL_simple_init_drivers,
diff --git a/quantum/led_matrix/led_matrix_drivers.h b/quantum/led_matrix/led_matrix_drivers.h
index 01821a83c4..4eab0ac748 100644
--- a/quantum/led_matrix/led_matrix_drivers.h
+++ b/quantum/led_matrix/led_matrix_drivers.h
@@ -23,6 +23,8 @@
 #    include "is31fl3743a-simple.h"
 #elif defined(LED_MATRIX_IS31FL3745)
 #    include "is31fl3745-simple.h"
+#elif defined(LED_MATRIX_IS31FL3746A)
+#    include "is31fl3746a-simple.h"
 #elif defined(IS31FLCOMMON)
 #    include "is31flcommon.h"
 #elif defined(LED_MATRIX_SNLED27351)
diff --git a/quantum/rgb_matrix/rgb_matrix_drivers.c b/quantum/rgb_matrix/rgb_matrix_drivers.c
index 0a41991efb..e3dd9beff7 100644
--- a/quantum/rgb_matrix/rgb_matrix_drivers.c
+++ b/quantum/rgb_matrix/rgb_matrix_drivers.c
@@ -100,6 +100,14 @@ const rgb_matrix_driver_t rgb_matrix_driver = {
     .set_color_all = is31fl3745_set_color_all,
 };
 
+#elif defined(RGB_MATRIX_IS31FL3746A)
+const rgb_matrix_driver_t rgb_matrix_driver = {
+    .init          = is31fl3746a_init_drivers,
+    .flush         = is31fl3746a_flush,
+    .set_color     = is31fl3746a_set_color,
+    .set_color_all = is31fl3746a_set_color_all,
+};
+
 #elif defined(IS31FLCOMMON)
 const rgb_matrix_driver_t rgb_matrix_driver = {
     .init          = IS31FL_RGB_init_drivers,
diff --git a/quantum/rgb_matrix/rgb_matrix_drivers.h b/quantum/rgb_matrix/rgb_matrix_drivers.h
index 786f2fa37a..07d376dfd7 100644
--- a/quantum/rgb_matrix/rgb_matrix_drivers.h
+++ b/quantum/rgb_matrix/rgb_matrix_drivers.h
@@ -25,6 +25,8 @@
 #    include "is31fl3743a.h"
 #elif defined(RGB_MATRIX_IS31FL3745)
 #    include "is31fl3745.h"
+#elif defined(RGB_MATRIX_IS31FL3746A)
+#    include "is31fl3746a.h"
 #elif defined(IS31FLCOMMON)
 #    include "is31flcommon.h"
 #elif defined(RGB_MATRIX_SNLED27351)