From 15ff7606013e6c4066c8c6173a543cfcbe43068f Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Thu, 21 Jun 2018 13:09:31 +1000
Subject: [PATCH] HAL_Linux: implement I2C bus masks

---
 libraries/AP_HAL_Linux/I2CDevice.cpp | 24 ++++++++++++++++++++++++
 libraries/AP_HAL_Linux/I2CDevice.h   | 15 +++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/libraries/AP_HAL_Linux/I2CDevice.cpp b/libraries/AP_HAL_Linux/I2CDevice.cpp
index fc50971531..8d679c535e 100644
--- a/libraries/AP_HAL_Linux/I2CDevice.cpp
+++ b/libraries/AP_HAL_Linux/I2CDevice.cpp
@@ -417,4 +417,28 @@ void I2CDeviceManager::teardown()
     }
 }
 
+/*
+  get mask of bus numbers for all configured I2C buses
+*/
+uint32_t I2CDeviceManager::get_bus_mask(void) const
+{
+    return HAL_LINUX_I2C_BUS_MASK;
+}
+
+/*
+  get mask of bus numbers for all configured internal I2C buses
+*/
+uint32_t I2CDeviceManager::get_bus_mask_internal(void) const
+{
+    return HAL_LINUX_I2C_INTERNAL_BUS_MASK;
+}
+
+/*
+  get mask of bus numbers for all configured external I2C buses
+*/
+uint32_t I2CDeviceManager::get_bus_mask_external(void) const
+{
+    return HAL_LINUX_I2C_EXTERNAL_BUS_MASK;
+}
+    
 }
diff --git a/libraries/AP_HAL_Linux/I2CDevice.h b/libraries/AP_HAL_Linux/I2CDevice.h
index 1acacca2fc..d26d5860e1 100644
--- a/libraries/AP_HAL_Linux/I2CDevice.h
+++ b/libraries/AP_HAL_Linux/I2CDevice.h
@@ -110,6 +110,21 @@ public:
      */
     void teardown();
 
+    /*
+      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;
+    
 protected:
     void _unregister(I2CBus &b);
     AP_HAL::OwnPtr<AP_HAL::I2CDevice> _create_device(I2CBus &b, uint8_t address) const;