From 4693501d9d67c64ecc0feb9f18929d3956301dfd Mon Sep 17 00:00:00 2001
From: Gustavo Jose de Sousa <gustavo.sousa@intel.com>
Date: Fri, 24 Jun 2016 14:17:01 -0300
Subject: [PATCH] AP_HAL: Device: add bus_type field

Sometimes it's necessary to know the type of bus to make some decisions where
AP_HAL::Device abstraction is used.
---
 libraries/AP_HAL/Device.h    | 11 +++++++++++
 libraries/AP_HAL/I2CDevice.h |  2 ++
 libraries/AP_HAL/SPIDevice.h |  2 ++
 3 files changed, 15 insertions(+)

diff --git a/libraries/AP_HAL/Device.h b/libraries/AP_HAL/Device.h
index fad3449ee6..8f6af29b90 100644
--- a/libraries/AP_HAL/Device.h
+++ b/libraries/AP_HAL/Device.h
@@ -26,6 +26,11 @@
  */
 class AP_HAL::Device {
 public:
+    enum BusType {
+        I2C,
+        SPI,
+    };
+
     enum Speed {
         SPEED_HIGH,
         SPEED_LOW,
@@ -33,6 +38,12 @@ public:
 
     typedef void PeriodicHandle;
 
+    const enum BusType bus_type;
+
+    Device(enum BusType type)
+        : bus_type(type)
+    { }
+
     virtual ~Device() { }
 
     /*
diff --git a/libraries/AP_HAL/I2CDevice.h b/libraries/AP_HAL/I2CDevice.h
index 49c62dca22..68481872a4 100644
--- a/libraries/AP_HAL/I2CDevice.h
+++ b/libraries/AP_HAL/I2CDevice.h
@@ -27,6 +27,8 @@ namespace AP_HAL {
 
 class I2CDevice : public Device {
 public:
+    I2CDevice() : Device(I2C) { }
+
     virtual ~I2CDevice() { }
 
     /*
diff --git a/libraries/AP_HAL/SPIDevice.h b/libraries/AP_HAL/SPIDevice.h
index 7a158985c4..917a5c5388 100644
--- a/libraries/AP_HAL/SPIDevice.h
+++ b/libraries/AP_HAL/SPIDevice.h
@@ -27,6 +27,8 @@ namespace AP_HAL {
 
 class SPIDevice : public Device {
 public:
+    SPIDevice() : Device(SPI) { }
+
     virtual ~SPIDevice() { }
     /* Device implementation */