more drivers are now cross platform

internal/legacy/pinhal.go

@@ -1,5 +1,7 @@
 package legacy
 
+import "errors"
+
 // PinOutput represents a pin hardware abstraction layer for a pin that can output a digital signal.
 // This is an alternative to drivers.PinOutput abstraction which is a function type. Pros and cons
 // of both approaches have been discussed in the [relevant issue]. PinOutput should only be used
@@ -19,11 +21,48 @@ type PinOutput interface {
 	Set(level bool)
 }
 
+// PinInput represents a pin hardware abstraction layer. See [PinOutput] for
+// more information on why this is "legacy".
+type PinInput interface {
+	Get() (level bool)
+}
+
 // ConfigurePinOut is a legacy function used to configure pins as outputs.
 //
 // Deprecated: Do not configure pins in drivers.
 // This is a legacy feature and should only be used by drivers that
 // previously configured pins in initialization to avoid breaking users.
-func ConfigurePinOut(p PinOutput) {
-	configurePinOut(p)
+func ConfigurePinOut(po PinOutput) {
+	configurePinOut(po)
 }
+
+// ConfigurePinInput is a legacy function used to configure pins as inputs.
+//
+// Deprecated: Do not configure pins in drivers.
+// This is a legacy feature and should only be used by drivers that
+// previously configured pins in initialization to avoid breaking users.
+func ConfigurePinInputPulldown(pi PinInput) {
+	configurePinInputPulldown(pi)
+}
+
+// ConfigurePinInput is a legacy function used to configure pins as inputs.
+//
+// Deprecated: Do not configure pins in drivers.
+// This is a legacy feature and should only be used by drivers that
+// previously configured pins in initialization to avoid breaking users.
+func ConfigurePinInput(pi PinInput) {
+	configurePinInput(pi)
+}
+
+// ConfigurePinInput is a legacy function used to configure pins as inputs.
+//
+// Deprecated: Do not configure pins in drivers.
+// This is a legacy feature and should only be used by drivers that
+// previously configured pins in initialization to avoid breaking users.
+func ConfigurePinInputPullup(pi PinInput) {
+	configurePinInputPullup(pi)
+}
+
+var (
+	ErrConfigBeforeInstantiated = errors.New("device must be instantiated with New before calling Configure method")
+)

internal/legacy/pinhal_baremetal.go

@@ -5,8 +5,24 @@ package legacy
 import "machine"
 
 func configurePinOut(p PinOutput) {
+	configurePin(p, machine.PinInputPulldown)
+}
+
+func configurePinInputPulldown(p PinInput) {
+	configurePin(p, machine.PinInputPulldown)
+}
+
+func configurePinInput(p PinInput) {
+	configurePin(p, machine.PinInput)
+}
+
+func configurePinInputPullup(p PinInput) {
+	configurePin(p, machine.PinInputPullup)
+}
+
+func configurePin(p any, mode machine.PinMode) {
 	machinePin, ok := p.(machine.Pin)
 	if ok {
-		machinePin.Configure(machine.PinConfig{Mode: machine.PinOutput})
+		machinePin.Configure(machine.PinConfig{Mode: mode})
 	}
 }

internal/legacy/pinhal_os.go

@@ -2,4 +2,7 @@
 
 package legacy
 
-func configurePinOut(p PinOutput) {}
+func configurePinOut(p PinOutput)          {}
+func configurePinInput(p PinInput)         {}
+func configurePinInputPulldown(p PinInput) {}
+func configurePinInputPullup(p PinInput)   {}