AP_HAL_Linux: use Empty version if not implemented

There's little point in having the Linux::AnalogIn just to implement and
empty interface. All implementations inside AP_HAL_Linux are already
inheriting directly from AP_HAL, so just remove it.

libraries/AP_HAL_Linux/AP_HAL_Linux_Namespace.h

@@ -9,8 +9,6 @@ namespace Linux {
     class I2CDriver;
     class SPIDeviceManager;
     class SPIDeviceDriver;
-    class AnalogSource;
-    class AnalogIn;
     class Storage;
     class GPIO_BBB;
     class GPIO_RPI;

libraries/AP_HAL_Linux/AP_HAL_Linux_Private.h

@@ -10,7 +10,6 @@
 #include "I2CDevice.h"
 #include "I2CDriver.h"
 #include "SPIDriver.h"
-#include "AnalogIn.h"
 #include "AnalogIn_ADS1115.h"
 #include "AnalogIn_IIO.h"
 #include "AnalogIn_Raspilot.h"

libraries/AP_HAL_Linux/AnalogIn.cpp

@@ -1,42 +0,0 @@
-#include "AnalogIn.h"
-
-using namespace Linux;
-
-AnalogSource::AnalogSource(float v) :
-    _v(v)
-{}
-
-float AnalogSource::read_average() {
-    return _v;
-}
-
-float AnalogSource::voltage_average() {
-    return 5.0 * _v / 1024.0;
-}
-
-float AnalogSource::voltage_latest() {
-    return 5.0 * _v / 1024.0;
-}
-
-float AnalogSource::read_latest() {
-    return _v;
-}
-
-void AnalogSource::set_pin(uint8_t p)
-{}
-
-void AnalogSource::set_stop_pin(uint8_t p)
-{}
-
-void AnalogSource::set_settle_time(uint16_t settle_time_ms)
-{}
-
-AnalogIn::AnalogIn()
-{}
-
-void AnalogIn::init()
-{}
-
-AP_HAL::AnalogSource* AnalogIn::channel(int16_t n) {
-    return new AnalogSource(1.11);
-}

libraries/AP_HAL_Linux/AnalogIn.h

@@ -1,29 +0,0 @@
-#pragma once
-
-#include "AP_HAL_Linux.h"
-
-class Linux::AnalogSource : public AP_HAL::AnalogSource {
-public:
-    AnalogSource(float v);
-    float read_average();
-    float read_latest();
-    void set_pin(uint8_t p);
-    void set_stop_pin(uint8_t p);
-    void set_settle_time(uint16_t settle_time_ms);
-    float voltage_average();
-    float voltage_latest();
-    float voltage_average_ratiometric() { return voltage_average(); }
-private:
-    float _v;
-};
-
-class Linux::AnalogIn : public AP_HAL::AnalogIn {
-public:
-    AnalogIn();
-    void init();
-    AP_HAL::AnalogSource* channel(int16_t n);
-
-    // we don't yet know how to get the board voltage
-    float board_voltage(void) { return 0.0f; }
-
-};

libraries/AP_HAL_Linux/HAL_Linux_Class.cpp

@@ -76,8 +76,6 @@ static SPIDeviceManager spiDeviceManager;
 static AnalogIn_ADS1115 analogIn;
 #elif CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_RASPILOT
 static AnalogIn_Raspilot analogIn;
-#elif CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_QFLIGHT
-static Empty::AnalogIn analogIn;
 #elif CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_PXF || \
       CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_ERLEBOARD || \
       CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_BBBMINI  || \
@@ -86,7 +84,7 @@ static AnalogIn_IIO analogIn;
 #elif CONFIG_HAL_BOARD_SUBTYPE == HAL_BOARD_SUBTYPE_LINUX_NAVIO2
 static AnalogIn_Navio2 analogIn;
 #else
-static AnalogIn analogIn;
+static Empty::AnalogIn analogIn;
 #endif
 
 /*

libraries/AP_HAL_QURT/Scheduler.cpp

@@ -17,7 +17,6 @@
 #include <dspal_types.h>
 
 #include "UARTDriver.h"
-//#include "AnalogIn.h"
 #include "Storage.h"
 #include "RCOutput.h"
 #include <AP_Scheduler/AP_Scheduler.h>
@@ -178,9 +177,6 @@ void Scheduler::_run_timers(bool called_from_timer_thread)
         _failsafe();
     }
 
-    // process analog input
-    // ((QURTAnalogIn *)hal.analogin)->_timer_tick();
-
     _in_timer_proc = false;
 }