diff --git a/libraries/AP_HAL_PX4/I2CDevice.cpp b/libraries/AP_HAL_PX4/I2CDevice.cpp
index 9918be9036..97d4415cd3 100644
--- a/libraries/AP_HAL_PX4/I2CDevice.cpp
+++ b/libraries/AP_HAL_PX4/I2CDevice.cpp
@@ -189,4 +189,28 @@ I2CDeviceManager::get_device(uint8_t bus, uint8_t address,
     return dev;
 }
 
+/*
+  get mask of bus numbers for all configured I2C buses
+*/
+uint32_t I2CDeviceManager::get_bus_mask(void) const
+{
+    return 0x03;
+}
+
+/*
+  get mask of bus numbers for all configured internal I2C buses
+*/
+uint32_t I2CDeviceManager::get_bus_mask_internal(void) const
+{
+    return 0x01;
+}
+
+/*
+  get mask of bus numbers for all configured external I2C buses
+*/
+uint32_t I2CDeviceManager::get_bus_mask_external(void) const
+{
+    return 0x02;
+}
+    
 }
diff --git a/libraries/AP_HAL_PX4/I2CDevice.h b/libraries/AP_HAL_PX4/I2CDevice.h
index 397a22b57b..d0ba739078 100644
--- a/libraries/AP_HAL_PX4/I2CDevice.h
+++ b/libraries/AP_HAL_PX4/I2CDevice.h
@@ -94,6 +94,20 @@ public:
                                                  uint32_t bus_clock=400000,
                                                  bool use_smbus = false,
                                                  uint32_t timeout_ms=4) override;
+    /*
+      get mask of bus numbers for all configured I2C buses
+     */
+    uint32_t get_bus_mask(void) const override;
+
+    /*
+      get mask of bus numbers for all configured external I2C buses
+     */
+    uint32_t get_bus_mask_external(void) const override;
+
+    /*
+      get mask of bus numbers for all configured internal I2C buses
+     */
+    uint32_t get_bus_mask_internal(void) const override;
 };
 
 }