diff --git a/keyboards/bajjak/bajjak.c b/keyboards/bajjak/bajjak.c
index e6102e817b0..6689a6ba2c7 100644
--- a/keyboards/bajjak/bajjak.c
+++ b/keyboards/bajjak/bajjak.c
@@ -138,14 +138,14 @@ uint8_t init_mcp23018(void) {
     // - input   : input  : 1
     // - driving : output : 0
     uint8_t data[] = {0b00000000, 0b00111111};
-    mcp23018_status = i2c_writeReg(I2C_ADDR, IODIRA, data, 2, BAJJAK_EZ_I2C_TIMEOUT);
+    mcp23018_status = i2c_write_register(I2C_ADDR, IODIRA, data, 2, BAJJAK_EZ_I2C_TIMEOUT);
 
     if (!mcp23018_status) {
         // set pull-up
         // - unused  : on  : 1
         // - input   : on  : 1
         // - driving : off : 0
-        mcp23018_status = i2c_writeReg(I2C_ADDR, IODIRA, data, 2, BAJJAK_EZ_I2C_TIMEOUT);
+        mcp23018_status = i2c_write_register(I2C_ADDR, IODIRA, data, 2, BAJJAK_EZ_I2C_TIMEOUT);
     }
 
 #ifdef LEFT_LEDS
@@ -172,7 +172,7 @@ uint8_t bajjak_left_leds_update(void) {
     uint8_t data[2];
     data[0] = 0b11111111 & ~(bajjak_left_led_1<<LEFT_LED_1_SHIFT);
     data[1] = 0b11111111 & ~(bajjak_left_led_2<<LEFT_LED_2_SHIFT);
-    mcp23018_status = i2c_writeReg(I2C_ADDR, OLATA, data, 2, BAJJAK_EZ_I2C_TIMEOUT);
+    mcp23018_status = i2c_write_register(I2C_ADDR, OLATA, data, 2, BAJJAK_EZ_I2C_TIMEOUT);
 
     return mcp23018_status;
 }
diff --git a/keyboards/bajjak/matrix.c b/keyboards/bajjak/matrix.c
index 424bc29e4e3..b0d1ab531f3 100644
--- a/keyboards/bajjak/matrix.c
+++ b/keyboards/bajjak/matrix.c
@@ -192,7 +192,7 @@ static void select_row(uint8_t row) {
             // set other rows hi-Z : 1
             uint8_t data;
             data = 0xFF & ~(1 << row);
-            mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOA, &data, 1, BAJJAK_EZ_I2C_TIMEOUT);
+            mcp23018_status = i2c_write_register(I2C_ADDR, GPIOA, &data, 1, BAJJAK_EZ_I2C_TIMEOUT);
 
         }
     } else {
diff --git a/keyboards/dc01/left/matrix.c b/keyboards/dc01/left/matrix.c
index fd21d4333b7..39e5be5a1d6 100644
--- a/keyboards/dc01/left/matrix.c
+++ b/keyboards/dc01/left/matrix.c
@@ -388,7 +388,7 @@ static void unselect_cols(void)
 // Complete rows from other modules over i2c
 i2c_status_t i2c_transaction(uint8_t address, uint32_t mask, uint8_t col_offset) {
     uint8_t data[MATRIX_ROWS + 1];
-    i2c_status_t status = i2c_readReg(address, 0x01, data, (MATRIX_ROWS + 1), 5);
+    i2c_status_t status = i2c_read_register(address, 0x01, data, (MATRIX_ROWS + 1), 5);
 
     for (uint8_t i = 0; i < (MATRIX_ROWS) && status >= 0; i++) { //assemble slave matrix in main matrix
         matrix[i] &= mask;  //mask bits to keep
diff --git a/keyboards/ergodox_ez/ergodox_ez.c b/keyboards/ergodox_ez/ergodox_ez.c
index 3d6272ae667..5270738f86d 100644
--- a/keyboards/ergodox_ez/ergodox_ez.c
+++ b/keyboards/ergodox_ez/ergodox_ez.c
@@ -156,14 +156,14 @@ uint8_t init_mcp23018(void) {
     // - input   : input  : 1
     // - driving : output : 0
     uint8_t data[] = {0b00000000, 0b00111111};
-    mcp23018_status = i2c_writeReg(I2C_ADDR, IODIRA, data, 2, ERGODOX_EZ_I2C_TIMEOUT);
+    mcp23018_status = i2c_write_register(I2C_ADDR, IODIRA, data, 2, ERGODOX_EZ_I2C_TIMEOUT);
 
     if (!mcp23018_status) {
         // set pull-up
         // - unused  : on  : 1
         // - input   : on  : 1
         // - driving : off : 0
-        mcp23018_status = i2c_writeReg(I2C_ADDR, GPPUA, data, 2, ERGODOX_EZ_I2C_TIMEOUT);
+        mcp23018_status = i2c_write_register(I2C_ADDR, GPPUA, data, 2, ERGODOX_EZ_I2C_TIMEOUT);
     }
 
 #ifdef LEFT_LEDS
@@ -191,7 +191,7 @@ uint8_t ergodox_left_leds_update(void) {
     uint8_t data[2];
     data[0] = 0b11111111 & ~(ergodox_left_led_3 << LEFT_LED_3_SHIFT);
     data[1] = 0b11111111 & ~(ergodox_left_led_2 << LEFT_LED_2_SHIFT) & ~(ergodox_left_led_1 << LEFT_LED_1_SHIFT);
-    mcp23018_status = i2c_writeReg(I2C_ADDR, OLATA, data, 2, ERGODOX_EZ_I2C_TIMEOUT);
+    mcp23018_status = i2c_write_register(I2C_ADDR, OLATA, data, 2, ERGODOX_EZ_I2C_TIMEOUT);
 
     return mcp23018_status;
 }
diff --git a/keyboards/ergodox_ez/matrix.c b/keyboards/ergodox_ez/matrix.c
index 28bee05779c..9013c0785f8 100644
--- a/keyboards/ergodox_ez/matrix.c
+++ b/keyboards/ergodox_ez/matrix.c
@@ -193,7 +193,7 @@ static void select_row(uint8_t row) {
             // set other rows hi-Z : 1
             uint8_t data;
             data = 0xFF & ~(1 << row);
-            mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOA, &data, 1, ERGODOX_EZ_I2C_TIMEOUT);
+            mcp23018_status = i2c_write_register(I2C_ADDR, GPIOA, &data, 1, ERGODOX_EZ_I2C_TIMEOUT);
         }
     } else {
         // select on teensy
diff --git a/keyboards/ferris/0_2/matrix.c b/keyboards/ferris/0_2/matrix.c
index cf26385f4c8..0fa66abea9f 100644
--- a/keyboards/ferris/0_2/matrix.c
+++ b/keyboards/ferris/0_2/matrix.c
@@ -77,7 +77,7 @@ uint8_t init_mcp23017(void) {
     // This means: we will write to the pins 0-4 on GPIOB (in select_rows)
     uint8_t buf[] = {0b11111111, 0b11110000};
     print("before transmit\n");
-    mcp23017_status = i2c_writeReg(I2C_ADDR, IODIRA, buf, sizeof(buf), MCP23017_I2C_TIMEOUT)
+    mcp23017_status = i2c_write_register(I2C_ADDR, IODIRA, buf, sizeof(buf), MCP23017_I2C_TIMEOUT)
     uprintf("after transmit %i\n", mcp23017_status);
     if (!mcp23017_status) {
         // set pull-up
@@ -86,7 +86,7 @@ uint8_t init_mcp23017(void) {
         // - driving : off : 0
         // This means: we will read all the bits on GPIOA
         // This means: we will write to the pins 0-4 on GPIOB (in select_rows)
-        mcp23017_status = i2c_writeReg(I2C_ADDR, GPPUA, buf, sizeof(buf), MCP23017_I2C_TIMEOUT)
+        mcp23017_status = i2c_write_register(I2C_ADDR, GPPUA, buf, sizeof(buf), MCP23017_I2C_TIMEOUT)
         uprintf("after transmit2 %i\n", mcp23017_status);
     }
     return mcp23017_status;
@@ -191,7 +191,7 @@ static matrix_row_t read_cols(uint8_t row) {
             // The return value is a row as represented in the generic matrix code were the rightmost bits represent the lower columns and zeroes represent non-depressed keys while ones represent depressed keys.
             // Since the pins connected to eact columns are sequential, and counting from zero up (col 5 -> GPIOA0, col 6 -> GPIOA1 and so on), the only transformation needed is a bitwise not to swap all zeroes and ones.
             uint8_t data[] = {0};
-            mcp23017_status = i2c_readReg(I2C_ADDR, MCP23017_GPIOA, data, sizeof(data), MCP23017_I2C_TIMEOUT);
+            mcp23017_status = i2c_read_register(I2C_ADDR, MCP23017_GPIOA, data, sizeof(data), MCP23017_I2C_TIMEOUT);
             return ~data[0];
         }
     }
@@ -237,7 +237,7 @@ static void select_row(uint8_t row) {
             // Select the desired row by writing a byte for the entire GPIOB bus where only the bit representing the row we want to select is a zero (write instruction) and every other bit is a one.
             // Note that the row - MATRIX_ROWS_PER_SIDE reflects the fact that being on the right hand, the columns are numbered from MATRIX_ROWS_PER_SIDE to MATRIX_ROWS, but the pins we want to write to are indexed from zero up on the GPIOB bus.
             uint8_t buf[]   = {0xFF & ~(1 << (row - MATRIX_ROWS_PER_SIDE))};
-            mcp23017_status = i2c_writeReg(I2C_ADDR, MCP23017_GPIOB, buf, sizeof(buf), MCP23017_I2C_TIMEOUT);
+            mcp23017_status = i2c_write_register(I2C_ADDR, MCP23017_GPIOB, buf, sizeof(buf), MCP23017_I2C_TIMEOUT);
         }
     }
 }
diff --git a/keyboards/gboards/ergotaco/ergotaco.c b/keyboards/gboards/ergotaco/ergotaco.c
index 694e07f0314..6795dfde4f2 100644
--- a/keyboards/gboards/ergotaco/ergotaco.c
+++ b/keyboards/gboards/ergotaco/ergotaco.c
@@ -50,14 +50,14 @@ uint8_t init_mcp23018(void) {
     // - input   : input  : 1
     // - driving : output : 0
     uint8_t data[] = {0b00000000, 0b00111111};
-    mcp23018_status = i2c_writeReg(I2C_ADDR, IODIRA, data, sizeof(data), ERGODOX_EZ_I2C_TIMEOUT);
+    mcp23018_status = i2c_write_register(I2C_ADDR, IODIRA, data, sizeof(data), ERGODOX_EZ_I2C_TIMEOUT);
 
     if (!mcp23018_status) {
         // set pull-up
         // - unused  : on  : 1
         // - input   : on  : 1
         // - driving : off : 0
-        mcp23018_status = i2c_writeReg(I2C_ADDR, GPPUA, data, sizeof(data), ERGODOX_EZ_I2C_TIMEOUT);
+        mcp23018_status = i2c_write_register(I2C_ADDR, GPPUA, data, sizeof(data), ERGODOX_EZ_I2C_TIMEOUT);
     }
 
     // SREG=sreg_prev;
diff --git a/keyboards/gboards/ergotaco/matrix.c b/keyboards/gboards/ergotaco/matrix.c
index 3c49f2802ea..40299f958e6 100644
--- a/keyboards/gboards/ergotaco/matrix.c
+++ b/keyboards/gboards/ergotaco/matrix.c
@@ -234,7 +234,7 @@ static matrix_row_t read_cols(uint8_t row)
             return 0;
         } else {
             uint8_t data = 0;
-            mcp23018_status = i2c_readReg(I2C_ADDR, GPIOB, &data, 1, ERGODOX_EZ_I2C_TIMEOUT);
+            mcp23018_status = i2c_read_register(I2C_ADDR, GPIOB, &data, 1, ERGODOX_EZ_I2C_TIMEOUT);
             data = (~((uint8_t)data) >> 2) & 0x01 ;
 #ifdef DEBUG_MATRIX
             if (data != 0x00) xprintf("I2C: %d\n", data);
@@ -268,7 +268,7 @@ static void select_row(uint8_t row)
 			// Read using bitmask
         } else { // set active row low  : 0 // set other rows hi-Z : 1
             uint8_t data = ~(1<<row);
-            mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOA, &data, 1, ERGODOX_EZ_I2C_TIMEOUT);
+            mcp23018_status = i2c_write_register(I2C_ADDR, GPIOA, &data, 1, ERGODOX_EZ_I2C_TIMEOUT);
         }
     } else {
         // Output low(DDR:1, PORT:0) to select
diff --git a/keyboards/gboards/georgi/georgi.c b/keyboards/gboards/georgi/georgi.c
index 745e8ab35dc..44b7067b475 100644
--- a/keyboards/gboards/georgi/georgi.c
+++ b/keyboards/gboards/georgi/georgi.c
@@ -46,14 +46,14 @@ uint8_t init_mcp23018(void) {
     // - input   : input  : 1
     // - driving : output : 0
     uint8_t data[] = {0b10000000, 0b11111111};
-    mcp23018_status = i2c_writeReg(I2C_ADDR, IODIRA, data, 2, ERGODOX_EZ_I2C_TIMEOUT);
+    mcp23018_status = i2c_write_register(I2C_ADDR, IODIRA, data, 2, ERGODOX_EZ_I2C_TIMEOUT);
 
     if (!mcp23018_status) {
         // set pull-up
         // - unused  : on  : 1
         // - input   : on  : 1
         // - driving : off : 0
-        mcp23018_status = i2c_writeReg(I2C_ADDR, GPPUA, data, 2, ERGODOX_EZ_I2C_TIMEOUT);
+        mcp23018_status = i2c_write_register(I2C_ADDR, GPPUA, data, 2, ERGODOX_EZ_I2C_TIMEOUT);
     }
 
     // SREG=sreg_prev;
diff --git a/keyboards/gboards/georgi/matrix.c b/keyboards/gboards/georgi/matrix.c
index d1151ae80e4..00c17a3e443 100644
--- a/keyboards/gboards/georgi/matrix.c
+++ b/keyboards/gboards/georgi/matrix.c
@@ -254,7 +254,7 @@ static matrix_row_t read_cols(uint8_t row)
             return 0;
         } else {
             uint8_t data = 0;
-            mcp23018_status = i2c_readReg(I2C_ADDR, GPIOB, &data, 1, ERGODOX_EZ_I2C_TIMEOUT);
+            mcp23018_status = i2c_read_register(I2C_ADDR, GPIOB, &data, 1, ERGODOX_EZ_I2C_TIMEOUT);
 
 #ifdef DEBUG_MATRIX
             if (data != 0x00) xprintf("I2C: %d\n", data);
@@ -298,7 +298,7 @@ static void select_row(uint8_t row)
         if (mcp23018_status) { // do nothing on error
         } else { // set active row low  : 0 // set other rows hi-Z : 1
         uint8_t data = 0xFF & ~(1<<row);
-        mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOA, &data, 1, ERGODOX_EZ_I2C_TIMEOUT);
+        mcp23018_status = i2c_write_register(I2C_ADDR, GPIOA, &data, 1, ERGODOX_EZ_I2C_TIMEOUT);
 
         }
     } else {
diff --git a/keyboards/gboards/gergo/gergo.c b/keyboards/gboards/gergo/gergo.c
index 41d383d4086..fa73c4b42f5 100644
--- a/keyboards/gboards/gergo/gergo.c
+++ b/keyboards/gboards/gergo/gergo.c
@@ -44,14 +44,14 @@ uint8_t init_mcp23018(void) {
     // - input   : input  : 1
     // - driving : output : 0
     uint8_t data[] = {0b10000000, 0b11111111};
-    mcp23018_status = i2c_writeReg(I2C_ADDR, IODIRA, data, sizeof(data), I2C_TIMEOUT);
+    mcp23018_status = i2c_write_register(I2C_ADDR, IODIRA, data, sizeof(data), I2C_TIMEOUT);
 
     if (!mcp23018_status) {
         // set pull-up
         // - unused  : on  : 1
         // - input   : on  : 1
         // - driving : off : 0
-        mcp23018_status = i2c_writeReg(I2C_ADDR, GPPUA, data, sizeof(data), I2C_TIMEOUT);
+        mcp23018_status = i2c_write_register(I2C_ADDR, GPPUA, data, sizeof(data), I2C_TIMEOUT);
     }
 
     // SREG=sreg_prev;
diff --git a/keyboards/gboards/gergo/matrix.c b/keyboards/gboards/gergo/matrix.c
index b4885361fbd..1fa80a58a05 100644
--- a/keyboards/gboards/gergo/matrix.c
+++ b/keyboards/gboards/gergo/matrix.c
@@ -297,7 +297,7 @@ static matrix_row_t read_cols(uint8_t row) {
             return 0;
         } else {
             uint8_t data = 0;
-            mcp23018_status = i2c_readReg(I2C_ADDR, GPIOB, &data, 1, I2C_TIMEOUT);
+            mcp23018_status = i2c_read_register(I2C_ADDR, GPIOB, &data, 1, I2C_TIMEOUT);
 
 #ifdef DEBUG_MATRIX
             if (~data != 0x00) xprintf("I2C: %d\n", ~data);
@@ -344,7 +344,7 @@ static void select_row(uint8_t row)
         if (mcp23018_status) { // do nothing on error
         } else { // set active row low  : 0 // set other rows hi-Z : 1
             uint8_t data = 0xFF & ~(1<<row);
-            mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
+            mcp23018_status = i2c_write_register(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
         }
     } else {
         // Output low(DDR:1, PORT:0) to select
diff --git a/keyboards/gboards/gergoplex/gergoplex.c b/keyboards/gboards/gergoplex/gergoplex.c
index b621201c166..b5844125bb5 100644
--- a/keyboards/gboards/gergoplex/gergoplex.c
+++ b/keyboards/gboards/gergoplex/gergoplex.c
@@ -40,14 +40,14 @@ uint8_t init_mcp23018(void) {
     // - input   : input  : 1
     // - driving : output : 0
     uint8_t data[] = {0b11000001, 0b11111111};
-    mcp23018_status = i2c_writeReg(I2C_ADDR, IODIRA, data, sizeof(data), I2C_TIMEOUT);
+    mcp23018_status = i2c_write_register(I2C_ADDR, IODIRA, data, sizeof(data), I2C_TIMEOUT);
 
     if (!mcp23018_status) {
         // set pull-up
         // - unused  : on  : 1
         // - input   : on  : 1
         // - driving : off : 0
-        mcp23018_status = i2c_writeReg(I2C_ADDR, GPPUA, data, sizeof(data), I2C_TIMEOUT);
+        mcp23018_status = i2c_write_register(I2C_ADDR, GPPUA, data, sizeof(data), I2C_TIMEOUT);
     }
 
     return mcp23018_status;
diff --git a/keyboards/gboards/gergoplex/matrix.c b/keyboards/gboards/gergoplex/matrix.c
index 9437b243779..9abe9a83b39 100644
--- a/keyboards/gboards/gergoplex/matrix.c
+++ b/keyboards/gboards/gergoplex/matrix.c
@@ -207,7 +207,7 @@ static void select_row(uint8_t row) {
         } else {                // set active row low  : 0 // set other rows hi-Z : 1
             uint8_t data;
             data = 0xFF & ~(1 << (row + 1));
-            mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
+            mcp23018_status = i2c_write_register(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
 
         }
     } else {
diff --git a/keyboards/handwired/frenchdev/frenchdev.c b/keyboards/handwired/frenchdev/frenchdev.c
index 65f1ccce4b9..818c395c8ef 100644
--- a/keyboards/handwired/frenchdev/frenchdev.c
+++ b/keyboards/handwired/frenchdev/frenchdev.c
@@ -84,14 +84,14 @@ uint8_t init_mcp23018(void) {
     // - input   : input  : 1
     // - driving : output : 0
     uint8_t data[] = {0b00000000, 0b00111111};
-    mcp23018_status = i2c_writeReg(I2C_ADDR, IODIRA, data, sizeof(data), I2C_TIMEOUT);
+    mcp23018_status = i2c_write_register(I2C_ADDR, IODIRA, data, sizeof(data), I2C_TIMEOUT);
 
     if (!mcp23018_status) {
         // set pull-up
         // - unused  : on  : 1
         // - input   : on  : 1
         // - driving : off : 0
-        mcp23018_status = i2c_writeReg(I2C_ADDR, GPPUA, data, sizeof(data), I2C_TIMEOUT);
+        mcp23018_status = i2c_write_register(I2C_ADDR, GPPUA, data, sizeof(data), I2C_TIMEOUT);
     }
 
     // SREG=sreg_prev;
diff --git a/keyboards/handwired/frenchdev/matrix.c b/keyboards/handwired/frenchdev/matrix.c
index af7c8b54442..68ec8e0801c 100644
--- a/keyboards/handwired/frenchdev/matrix.c
+++ b/keyboards/handwired/frenchdev/matrix.c
@@ -224,7 +224,7 @@ static matrix_row_t read_cols(uint8_t row)
             return 0;
         } else {
             uint8_t data = 0;
-            mcp23018_status = i2c_readReg(I2C_ADDR, GPIOB, &data, 1, I2C_TIMEOUT);
+            mcp23018_status = i2c_read_register(I2C_ADDR, GPIOB, &data, 1, I2C_TIMEOUT);
 
             return ~data;
         }
@@ -259,7 +259,7 @@ static void unselect_rows(void)
         // set all rows hi-Z : 1
         uint8_t data;
         data = 0xFF & ~(0<<8);
-        mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
+        mcp23018_status = i2c_write_register(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
 
     }
 
@@ -283,7 +283,7 @@ static void select_row(uint8_t row)
             // set active row low  : 0
             // set other rows hi-Z : 1
             uint8_t data = 0xFF & ~(1<<row) & ~(0<<8);
-            mcp23018_status = i2c_writeReg(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
+            mcp23018_status = i2c_write_register(I2C_ADDR, GPIOA, &data, 1, I2C_TIMEOUT);
         }
     } else {
         // select on teensy
diff --git a/keyboards/handwired/pterodactyl/matrix.c b/keyboards/handwired/pterodactyl/matrix.c
index 0dff65eda60..54da26a7d46 100644
--- a/keyboards/handwired/pterodactyl/matrix.c
+++ b/keyboards/handwired/pterodactyl/matrix.c
@@ -182,14 +182,14 @@ void init_expander(void) {
     uint8_t data[] = { expander_input_pin_mask, 0};
 #   endif
 #endif
-    expander_status = i2c_writeReg(I2C_ADDR, IODIRA, data, sizeof(data), I2C_TIMEOUT);
+    expander_status = i2c_write_register(I2C_ADDR, IODIRA, data, sizeof(data), I2C_TIMEOUT);
 
     if (!expander_status) {
         // set pull-up
         // - unused  : off : 0
         // - input   : on  : 1
         // - driving : off : 0
-        expander_status = i2c_writeReg(I2C_ADDR, GPPUA, data, sizeof(data), I2C_TIMEOUT);
+        expander_status = i2c_write_register(I2C_ADDR, GPPUA, data, sizeof(data), I2C_TIMEOUT);
     }
 
 }
@@ -305,7 +305,7 @@ static bool read_cols_on_row(matrix_row_t current_matrix[], uint8_t current_row)
     // Read columns from expander, unless it's in an error state
     if (! expander_status) {
         uint8_t data;
-        i2c_readReg(I2C_ADDR, EXPANDER_COL_REGISTER, &data, 1, I2C_TIMEOUT);
+        i2c_read_register(I2C_ADDR, EXPANDER_COL_REGISTER, &data, 1, I2C_TIMEOUT);
         current_matrix[current_row] |= (~data) & expander_input_pin_mask;
     }
 
@@ -329,7 +329,7 @@ static void select_row(uint8_t row) {
         // set active row low  : 0
         // set other rows hi-Z : 1
         uint8_t data = 0xFF & ~(1<<row);
-        i2c_writeReg(I2C_ADDR, EXPANDER_ROW_REGISTER, &data, 1, I2C_TIMEOUT);
+        i2c_write_register(I2C_ADDR, EXPANDER_ROW_REGISTER, &data, 1, I2C_TIMEOUT);
     }
 
     // select on teensy
@@ -385,7 +385,7 @@ static bool read_rows_on_col(matrix_row_t current_matrix[], uint8_t current_col)
             return false;
         }
 
-        i2c_writeReg(I2C_ADDR, EXPANDER_ROW_REGISTER, &column_state, 1, I2C_TIMEOUT);
+        i2c_write_register(I2C_ADDR, EXPANDER_ROW_REGISTER, &column_state, 1, I2C_TIMEOUT);
         column_state = ~column_state;
     } else {
         for (uint8_t current_row = 0; current_row < MATRIX_ROWS; current_row++) {
diff --git a/keyboards/hotdox/left.c b/keyboards/hotdox/left.c
index f963ecdae78..5196fb3115e 100644
--- a/keyboards/hotdox/left.c
+++ b/keyboards/hotdox/left.c
@@ -99,7 +99,7 @@ i2c_status_t left_write(uint8_t reg, uint8_t data)
 
   i2c_status_t ret;
 
-  ret = i2c_writeReg(I2C_ADDR, reg,  &data, sizeof(data), HOTDOX_I2C_TIMEOUT); 
+  ret = i2c_write_register(I2C_ADDR, reg,  &data, sizeof(data), HOTDOX_I2C_TIMEOUT); 
 
   return ret;
 }
@@ -112,7 +112,7 @@ i2c_status_t left_read(uint8_t reg, uint8_t *data)
   }
 
   i2c_status_t ret = 0;
-  ret = i2c_readReg(I2C_ADDR, reg, data, 1, HOTDOX_I2C_TIMEOUT);
+  ret = i2c_read_register(I2C_ADDR, reg, data, 1, HOTDOX_I2C_TIMEOUT);
 
   return ret;
 }
diff --git a/keyboards/system76/launch_1/usb_mux.c b/keyboards/system76/launch_1/usb_mux.c
index dd51b7c4b29..7ce1da07aaa 100644
--- a/keyboards/system76/launch_1/usb_mux.c
+++ b/keyboards/system76/launch_1/usb_mux.c
@@ -79,7 +79,7 @@ i2c_status_t usb7206_read_reg(struct USB7206* self, uint32_t addr, uint8_t* data
 
     uint16_t read = 0x0006; // Buffer address 6 to skip header
     uint8_t data_with_buffer_length[length];
-    status = i2c_readReg16((self->addr << 1), read, data_with_buffer_length, length, I2C_TIMEOUT);
+    status = i2c_read_register16((self->addr << 1), read, data_with_buffer_length, length, I2C_TIMEOUT);
 
     for (uint16_t i = 0; i < (length - 1) && status >= 0; i++) {
         data[i] = data_with_buffer_length[i+1];
diff --git a/platforms/chibios/drivers/i2c_master.c b/platforms/chibios/drivers/i2c_master.c
index ad11d850dd7..0d5fb1e9853 100644
--- a/platforms/chibios/drivers/i2c_master.c
+++ b/platforms/chibios/drivers/i2c_master.c
@@ -206,5 +206,5 @@ __attribute__((weak)) i2c_status_t i2c_ping_address(uint8_t address, uint16_t ti
     // Best effort instead tries reading register 0 which will either succeed or timeout.
     // This approach may produce false negative results for I2C devices that do not respond to a register 0 read request.
     uint8_t data = 0;
-    return i2c_readReg(address, 0, &data, sizeof(data), timeout);
+    return i2c_read_register(address, 0, &data, sizeof(data), timeout);
 }
\ No newline at end of file