diff --git a/firmware/common/hackrf_core.c b/firmware/common/hackrf_core.c
index d7666322..eeb364b4 100644
--- a/firmware/common/hackrf_core.c
+++ b/firmware/common/hackrf_core.c
@@ -22,7 +22,7 @@
  */
 
 #include "hackrf_core.h"
-#include "hackrf-ui.h"
+#include "hackrf_ui.h"
 #include "si5351c.h"
 #include "spi_ssp.h"
 #include "max2837.h"
@@ -916,4 +916,4 @@ void halt_and_flash(const uint32_t duration) {
 		led_off(LED3);
 		delay(duration);
 	}
-}
\ No newline at end of file
+}
diff --git a/firmware/common/hackrf-ui.c b/firmware/common/hackrf_ui.c
similarity index 95%
rename from firmware/common/hackrf-ui.c
rename to firmware/common/hackrf_ui.c
index bb1a045d..39518f60 100644
--- a/firmware/common/hackrf-ui.c
+++ b/firmware/common/hackrf_ui.c
@@ -19,7 +19,7 @@
  * Boston, MA 02110-1301, USA.
  */
 
-#include "hackrf-ui.h"
+#include "hackrf_ui.h"
 
 #include "ui_portapack.h"
 #include "ui_rad1o.h"
@@ -42,6 +42,7 @@ void hackrf_ui_set_first_if_frequency_null(const uint64_t frequency) { UNUSED(fr
 void hackrf_ui_set_filter_null(const rf_path_filter_t filter) { UNUSED(filter); }
 void hackrf_ui_set_antenna_bias_null(bool antenna_bias) { UNUSED(antenna_bias); }
 void hackrf_ui_set_clock_source_null(clock_source_t source) { UNUSED(source); }
+bool hackrf_ui_operacake_gpio_compatible_null(void) { return true; }
 
 /* Null UI function table, used if there's no hardware UI detected. Eliminates the
  * need to check for null UI before calling a function in the table.
@@ -60,6 +61,7 @@ static const hackrf_ui_t hackrf_ui_null = {
 	&hackrf_ui_set_filter_null,
 	&hackrf_ui_set_antenna_bias_null,
 	&hackrf_ui_set_clock_source_null,
+	&hackrf_ui_operacake_gpio_compatible_null
 };
 
 static const hackrf_ui_t* ui = NULL;
diff --git a/firmware/common/hackrf-ui.h b/firmware/common/hackrf_ui.h
similarity index 95%
rename from firmware/common/hackrf-ui.h
rename to firmware/common/hackrf_ui.h
index 5ac07ada..a3252b54 100644
--- a/firmware/common/hackrf-ui.h
+++ b/firmware/common/hackrf_ui.h
@@ -38,6 +38,7 @@ typedef void (*hackrf_ui_set_first_if_frequency_fn)(const uint64_t frequency);
 typedef void (*hackrf_ui_set_filter_fn)(const rf_path_filter_t filter);
 typedef void (*hackrf_ui_set_antenna_bias_fn)(bool antenna_bias);
 typedef void (*hackrf_ui_set_clock_source_fn)(clock_source_t source);
+typedef bool (*hackrf_ui_operacake_gpio_compatible_fn)(void);
 
 typedef struct {
 	hackrf_ui_init_fn init;
@@ -53,6 +54,7 @@ typedef struct {
 	hackrf_ui_set_filter_fn set_filter;
 	hackrf_ui_set_antenna_bias_fn set_antenna_bias;
 	hackrf_ui_set_clock_source_fn set_clock_source;
+	hackrf_ui_operacake_gpio_compatible_fn operacake_gpio_compatible;
 } hackrf_ui_t;
 
 /* TODO: Lame hack to know that PortaPack was detected.
diff --git a/firmware/common/rf_path.c b/firmware/common/rf_path.c
index 0e7bb42f..daae972f 100644
--- a/firmware/common/rf_path.c
+++ b/firmware/common/rf_path.c
@@ -26,7 +26,7 @@
 
 #include <hackrf_core.h>
 
-#include "hackrf-ui.h"
+#include "hackrf_ui.h"
 
 #include <mixer.h>
 #include <max2837.h>
diff --git a/firmware/common/tuning.c b/firmware/common/tuning.c
index 3c500eec..6f42c154 100644
--- a/firmware/common/tuning.c
+++ b/firmware/common/tuning.c
@@ -22,7 +22,7 @@
 
 #include "tuning.h"
 
-#include "hackrf-ui.h"
+#include "hackrf_ui.h"
 
 #include <hackrf_core.h>
 #include <mixer.h>
diff --git a/firmware/common/ui_portapack.c b/firmware/common/ui_portapack.c
index d9dc90da..24383b7d 100644
--- a/firmware/common/ui_portapack.c
+++ b/firmware/common/ui_portapack.c
@@ -549,6 +549,10 @@ static void portapack_ui_set_clock_source(clock_source_t source) {
 	portapack_lcd_draw_string(label_point, s);
 }
 
+static bool portapack_ui_operacake_gpio_compatible(void) {
+	return false;
+}
+
 const hackrf_ui_t portapack_hackrf_ui = {
 	&portapack_ui_init,
 	&portapack_ui_set_frequency,
@@ -563,6 +567,7 @@ const hackrf_ui_t portapack_hackrf_ui = {
 	&portapack_ui_set_filter,
 	&portapack_ui_set_antenna_bias,
 	&portapack_ui_set_clock_source,
+	&portapack_ui_operacake_gpio_compatible,
 };
 
 const hackrf_ui_t* portapack_hackrf_ui_init() {
diff --git a/firmware/common/ui_portapack.h b/firmware/common/ui_portapack.h
index 22d27d9c..ac5fe330 100644
--- a/firmware/common/ui_portapack.h
+++ b/firmware/common/ui_portapack.h
@@ -22,7 +22,7 @@
 #ifndef __UI_PORTAPACK_H__
 #define __UI_PORTAPACK_H__
 
-#include "hackrf-ui.h"
+#include "hackrf_ui.h"
 
 const hackrf_ui_t* portapack_hackrf_ui_init() __attribute__((weak));
 
diff --git a/firmware/common/ui_rad1o.c b/firmware/common/ui_rad1o.c
index af4e4fb8..d94fb53b 100644
--- a/firmware/common/ui_rad1o.c
+++ b/firmware/common/ui_rad1o.c
@@ -88,6 +88,10 @@ static void rad1o_ui_set_clock_source(clock_source_t source) {
 	hackrf_ui_setClockSource(source);
 }
 
+static bool rad1o_ui_operacake_gpio_compatible(void) {
+	return true;
+}
+
 static const hackrf_ui_t rad1o_ui = {
 	&rad1o_ui_init,
 	&rad1o_ui_set_frequency,
@@ -102,6 +106,7 @@ static const hackrf_ui_t rad1o_ui = {
 	&rad1o_ui_set_filter,
 	&rad1o_ui_set_antenna_bias,
 	&rad1o_ui_set_clock_source,
+	&rad1o_ui_operacake_gpio_compatible,
 };
 
 const hackrf_ui_t* rad1o_ui_setup(void) {
diff --git a/firmware/common/ui_rad1o.h b/firmware/common/ui_rad1o.h
index 7c14a79a..daeddb04 100644
--- a/firmware/common/ui_rad1o.h
+++ b/firmware/common/ui_rad1o.h
@@ -22,7 +22,7 @@
 #ifndef __UI_RAD1O_H__
 #define __UI_RAD1O_H__
 
-#include "hackrf-ui.h"
+#include "hackrf_ui.h"
 
 const hackrf_ui_t* rad1o_ui_setup(void) __attribute__((weak));
 
diff --git a/firmware/hackrf-common.cmake b/firmware/hackrf-common.cmake
index e978ca8f..cd32c082 100644
--- a/firmware/hackrf-common.cmake
+++ b/firmware/hackrf-common.cmake
@@ -159,7 +159,7 @@ macro(DeclareTargets)
 		${PATH_HACKRF_FIRMWARE_COMMON}/spi_bus.c
 		${PATH_HACKRF_FIRMWARE_COMMON}/spi_ssp.c
 		${PATH_HACKRF_FIRMWARE_COMMON}/gpio_lpc.c
-		${PATH_HACKRF_FIRMWARE_COMMON}/hackrf-ui.c
+		${PATH_HACKRF_FIRMWARE_COMMON}/hackrf_ui.c
 	)
 
 	if(BOARD STREQUAL "RAD1O")
diff --git a/firmware/hackrf_usb/hackrf_usb.c b/firmware/hackrf_usb/hackrf_usb.c
index 195250a2..88159db4 100644
--- a/firmware/hackrf_usb/hackrf_usb.c
+++ b/firmware/hackrf_usb/hackrf_usb.c
@@ -50,7 +50,7 @@
 #include "cpld_xc2c.h"
 #include "portapack.h"
  
-#include "hackrf-ui.h"
+#include "hackrf_ui.h"
 
 extern uint32_t __m0_start__;
 extern uint32_t __m0_end__;
@@ -241,7 +241,7 @@ int main(void) {
 	
 	rf_path_init(&rf_path);
 
-	if( hackrf_ui() == NULL ) {
+	if( hackrf_ui()->operacake_gpio_compatible() ) {
 		operacake_allow_gpio = true;
 	} else {
 		operacake_allow_gpio = false;
diff --git a/firmware/hackrf_usb/usb_api_transceiver.c b/firmware/hackrf_usb/usb_api_transceiver.c
index 86c044d4..f75eb55f 100644
--- a/firmware/hackrf_usb/usb_api_transceiver.c
+++ b/firmware/hackrf_usb/usb_api_transceiver.c
@@ -22,7 +22,7 @@
 
 #include "usb_api_transceiver.h"
 
-#include "hackrf-ui.h"
+#include "hackrf_ui.h"
 #include <libopencm3/cm3/vector.h>
 #include "usb_bulk_buffer.h"