Hardcoded toggled inputs (eg. simulated hi-lo gearshift-lock in racing games) can now be manually turned off or on by the user. [hap]

For example, to disable the toggle on the shifter in outrun, open /cfg/outrun.cfg and add toggle="no" to the port tag, like so:
<port tag=":SERVICE" type="P1_BUTTON1" mask="16" defvalue="0" toggle="no">

src/emu/ioport.c

@@ -245,6 +245,7 @@ struct ioport_field_live
 	ioport_value            value;              // current value of this port
 	UINT8                   impulse;            // counter for impulse controls
 	bool                    last;               // were we pressed last time?
+	bool                    toggle;             // current toggle setting
 	digital_joystick::direction_t joydir;       // digital joystick direction index
 	astring                 name;               // overridden name
 };
@@ -1813,6 +1814,12 @@ void ioport_field::get_user_settings(user_settings &settings)
 		settings.centerdelta = m_live->analog->centerdelta();
 		settings.reverse = m_live->analog->reverse();
 	}
+	
+	// non-analog settings
+	else
+	{
+		settings.toggle = m_live->toggle;
+	}
 }
 
 
@@ -1845,6 +1852,12 @@ void ioport_field::set_user_settings(const user_settings &settings)
 		m_live->analog->m_centerdelta = settings.centerdelta;
 		m_live->analog->m_reverse = settings.reverse;
 	}
+
+	// non-analog settings
+	else
+	{
+		m_live->toggle = settings.toggle;
+	}
 }
 
 
@@ -2036,12 +2049,12 @@ void ioport_field::frame_update(ioport_value &result, bool mouse_down)
 	// if this is a switch-down event, handle impulse and toggle
 	if (changed && curstate)
 	{
-		// impluse controls: reset the impulse counter
+		// impulse controls: reset the impulse counter
 		if (effective_impulse != 0 && m_live->impulse == 0)
 			m_live->impulse = effective_impulse;
 
 		// toggle controls: flip the toggle state or advance to the next setting
-		if (toggle())
+		if (m_live->toggle)
 		{
 			if (m_settinglist.count() == 0)
 				m_live->value ^= m_mask;
@@ -2060,7 +2073,7 @@ void ioport_field::frame_update(ioport_value &result, bool mouse_down)
 
 	// for toggle switches, the current value is folded into the port's default value
 	// so we always return FALSE here
-	if (toggle())
+	if (m_live->toggle)
 		curstate = false;
 
 	// additional logic to restrict digital joysticks
@@ -2262,6 +2275,7 @@ ioport_field_live::ioport_field_live(ioport_field &field, analog_field *analog)
 		value(field.defvalue()),
 		impulse(0),
 		last(0),
+		toggle(field.toggle()),
 		joydir(digital_joystick::JOYDIR_COUNT)
 {
 	// fill in the basic values
@@ -3187,11 +3201,20 @@ bool ioport_manager::load_game_config(xml_data_node *portnode, int type, int pla
 						if (newseq[seqtype][0] != INPUT_CODE_INVALID)
 							field->live().seq[seqtype] = newseq[seqtype];
 
-					// for non-analog fields, fetch the value
+					// fetch configurable attributes
+					// for non-analog fields
 					if (field->live().analog == NULL)
+					{
+						// fetch the value
 						field->live().value = xml_get_attribute_int(portnode, "value", field->defvalue());
 						
-					// for analog fields, fetch configurable analog attributes
+						// fetch yes/no for toggle setting
+						const char *togstring = xml_get_attribute_string(portnode, "toggle", NULL);
+						if (togstring != NULL)
+							field->live().toggle = (strcmp(togstring, "yes") == 0);
+					}
+
+					// for analog fields
 					else
 					{
 						// get base attributes
@@ -3338,7 +3361,10 @@ void ioport_manager::save_game_inputs(xml_data_node *parentnode)
 
 				// non-analog changes
 				if (!field->is_analog())
+				{
 					changed |= ((field->live().value & field->mask()) != (field->defvalue() & field->mask()));
+					changed |= (field->live().toggle != field->toggle());
+				}
 
 				// analog changes
 				else
@@ -3373,6 +3399,8 @@ void ioport_manager::save_game_inputs(xml_data_node *parentnode)
 						{
 							if ((field->live().value & field->mask()) != (field->defvalue() & field->mask()))
 								xml_set_attribute_int(portnode, "value", field->live().value & field->mask());
+							if (field->live().toggle != field->toggle())
+								xml_set_attribute(portnode, "toggle", field->live().toggle ? "yes" : "no");
 						}
 
 						// write out analog changes

src/emu/ioport.h

@@ -1078,6 +1078,7 @@ public:
 		INT32           delta;                  // for analog controls
 		INT32           centerdelta;            // for analog controls
 		bool            reverse;                // for analog controls
+		bool            toggle;                 // for non-analog controls
 	};
 	void get_user_settings(user_settings &settings);
 	void set_user_settings(const user_settings &settings);