Remove now duplicate change

src/System.Device.Gpio/System/Device/Gpio/Drivers/RaspberryPi3Driver.cs

@@ -157,12 +157,6 @@ private static GpioDriver CreateWindows10GpioDriver()
         /// <inheritdoc/>
         protected internal override int PinCount => _internalDriver.PinCount;
 
-        /// <summary>
-        /// The Raspberry Pi does support extended pin modes, but the this may depend on the actual driver implementation.
-        /// </summary>
-        /// <remarks>This returns true on Linux, false on Windows</remarks>
-        protected internal override bool ExtendedPinModeSupported => _internalDriver.ExtendedPinModeSupported;
-
         /// <inheritdoc/>
         protected internal override void AddCallbackForPinValueChangedEvent(int pinNumber, PinEventTypes eventTypes, PinChangeEventHandler callback) => _internalDriver.AddCallbackForPinValueChangedEvent(pinNumber, eventTypes, callback);
 
@@ -202,18 +196,6 @@ protected internal override int ConvertPinNumberToLogicalNumberingScheme(int pin
         /// <inheritdoc/>
         protected internal override void Write(int pinNumber, PinValue value) => _internalDriver.Write(pinNumber, value);
 
-        /// <inheritdoc />
-        protected internal override ExtendedPinMode GetExtendedPinMode(int pinNumber)
-        {
-            return _internalDriver.GetExtendedPinMode(pinNumber);
-            }
-
-        /// <inheritdoc />
-        protected internal override void SetExtendedPinMode(int pinNumber, ExtendedPinMode altMode)
-        {
-            _internalDriver.SetExtendedPinMode(pinNumber, altMode);
-        }
-
         /// <summary>
         /// Retrieve the current alternate pin mode for a given logical pin.
         /// This works also with closed pins.

src/System.Device.Gpio/System/Device/Gpio/Drivers/RaspberryPi3LinuxDriver.cs

@@ -45,12 +45,6 @@ public RaspberryPi3LinuxDriver()
         /// </summary>
         protected internal override int PinCount => 28;
 
-        /// <summary>
-        /// This driver does support extended pin modes, called ALT0-ALT5. See the hardware spec sheet to get information about
-        /// the possible values for each pin.
-        /// </summary>
-        protected internal override bool ExtendedPinModeSupported => true;
-
         /// <summary>
         /// Returns true if this is a Raspberry Pi4
         /// </summary>
@@ -452,101 +446,6 @@ protected internal RaspberryPi3Driver.AltMode GetAlternatePinMode(int pinNumber)
             throw new InvalidOperationException("Invalid register value");
         }
 
-        /// <summary>
-        /// Set the specified alternate mode for the given pin.
-        /// Check the manual to know what each pin can do.
-        /// </summary>
-        /// <param name="pinNumber">Pin number in the logcal scheme of the driver</param>
-        /// <param name="altPinMode">Alternate mode to set</param>
-        /// <exception cref="NotSupportedException">This mode is not supported by this driver (or by the given pin)</exception>
-        /// <remarks>The method is intended for usage by higher-level abstraction interfaces. User code should be very careful when using this method.</remarks>
-        protected internal void SetAlternatePinMode(int pinNumber, RaspberryPi3Driver.AltMode altPinMode)
-        {
-            Initialize();
-            ValidatePinNumber(pinNumber);
-
-            /*
-             * There are 6 registers (4-byte ints) that control the mode for all pins. Each
-             * register controls the mode for 10 pins. Each pin uses 3 bits in the register
-             * containing the mode.
-             */
-
-            // Define the shift to get the right 3 bits in the register
-            int shift = (pinNumber % 10) * 3;
-            // Gets a pointer to the register that holds the mode for the pin
-            uint* registerPointer = &_registerViewPointer->GPFSEL[pinNumber / 10];
-            uint register = *registerPointer;
-            // Clear the 3 bits to 0 for the pin Number.
-            register &= ~(0b111U << shift);
-            // Set the 3 bits to the desired mode for that pin.
-            uint modeBits = 0; // Default: Gpio input
-
-            modeBits = altPinMode switch
-            {
-                RaspberryPi3Driver.AltMode.Input => 0b000,
-                RaspberryPi3Driver.AltMode.Output => 0b001,
-                RaspberryPi3Driver.AltMode.Alt0 => 0b100,
-                RaspberryPi3Driver.AltMode.Alt1 => 0b101,
-                RaspberryPi3Driver.AltMode.Alt2 => 0b110,
-                RaspberryPi3Driver.AltMode.Alt3 => 0b111,
-                RaspberryPi3Driver.AltMode.Alt4 => 0b011,
-                RaspberryPi3Driver.AltMode.Alt5 => 0b010,
-                _ => throw new InvalidOperationException($"Unknown Alternate pin mode value: {altPinMode}")
-            };
-
-            register |= (modeBits) << shift;
-            *registerPointer = register;
-        }
-
-        /// <summary>
-        /// Retrieve the current alternate pin mode for a given logical pin.
-        /// This works also with closed pins.
-        /// </summary>
-        /// <param name="pinNumber">Pin number in the logical scheme of the driver</param>
-        /// <returns>Current pin mode</returns>
-        protected internal RaspberryPi3Driver.AltMode GetAlternatePinMode(int pinNumber)
-        {
-            Initialize();
-            ValidatePinNumber(pinNumber);
-            /*
-             * There are 6 registers(4-byte ints) that control the mode for all pins. Each
-             * register controls the mode for 10 pins. Each pin uses 3 bits in the register
-             * containing the mode.
-             */
-
-            // Define the shift to get the right 3 bits in the register
-            int shift = (pinNumber % 10) * 3;
-            // Gets a pointer to the register that holds the mode for the pin
-            uint* registerPointer = &_registerViewPointer->GPFSEL[pinNumber / 10];
-            uint register = *registerPointer;
-            // get the three bits of the register
-            register = (register >> shift) & 0b111;
-
-            switch (register)
-            {
-                case 0b000:
-                    // Input
-                    return RaspberryPi3Driver.AltMode.Input;
-                case 0b001:
-                    return RaspberryPi3Driver.AltMode.Output;
-                case 0b100:
-                    return RaspberryPi3Driver.AltMode.Alt0;
-                case 0b101:
-                    return RaspberryPi3Driver.AltMode.Alt1;
-                case 0b110:
-                    return RaspberryPi3Driver.AltMode.Alt2;
-                case 0b111:
-                    return RaspberryPi3Driver.AltMode.Alt3;
-                case 0b011:
-                    return RaspberryPi3Driver.AltMode.Alt4;
-                case 0b010:
-                    return RaspberryPi3Driver.AltMode.Alt5;
-            }
-
-            // This cannot happen.
-            throw new InvalidOperationException("Invalid register value");
-        }
-
         /// <summary>
         /// Blocks execution until an event of type eventType is received or a cancellation is requested.
         /// </summary>

src/System.Device.Gpio/System/Device/Gpio/GpioDriver.cs

@@ -17,11 +17,6 @@ public abstract class GpioDriver : IDisposable
         /// </summary>
         protected internal abstract int PinCount { get; }
 
-        /// <summary>
-        /// True if this driver supports extended pin mode settings.
-        /// </summary>
-        protected internal virtual bool ExtendedPinModeSupported => false;
-
         /// <summary>
         /// Converts a board pin number to the driver's logical numbering scheme.
         /// </summary>