Input: gameport - add ISA and HAS_IOPORT dependencies

In a future patch HAS_IOPORT=n will result in inb()/outb() and friends
not being declared. As ISA already implies HAS_IOPORT we can simply add
this dependency and guard sections of code using inb()/outb() as
alternative access methods.
Co-developed-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Link: https://lore.kernel.org/r/20230703152355.3897456-2-schnelle@linux.ibm.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/gameport/Kconfig

@@ -25,6 +25,7 @@ if GAMEPORT
 
 config GAMEPORT_NS558
 	tristate "Classic ISA and PnP gameport support"
+	depends on ISA
 	help
 	  Say Y here if you have an ISA or PnP gameport.
 
@@ -35,6 +36,7 @@ config GAMEPORT_NS558
 
 config GAMEPORT_L4
 	tristate "PDPI Lightning 4 gamecard support"
+	depends on ISA
 	help
 	  Say Y here if you have a PDPI Lightning 4 gamecard.
 
@@ -53,7 +55,7 @@ config GAMEPORT_EMU10K1
 
 config GAMEPORT_FM801
 	tristate "ForteMedia FM801 gameport support"
-	depends on PCI
+	depends on PCI && HAS_IOPORT
 	help
 	  Say Y here if you have ForteMedia FM801 PCI audio controller
 	  (Abit AU10, Genius Sound Maker, HP Workstation zx2000,

drivers/input/gameport/gameport.c

@@ -519,12 +519,32 @@ EXPORT_SYMBOL(gameport_set_phys);
 
 static void gameport_default_trigger(struct gameport *gameport)
 {
+#ifdef CONFIG_HAS_IOPORT
 	outb(0xff, gameport->io);
+#endif
 }
 
 static unsigned char gameport_default_read(struct gameport *gameport)
 {
+#ifdef CONFIG_HAS_IOPORT
 	return inb(gameport->io);
+#else
+	return 0xff;
+#endif
+}
+
+static void gameport_setup_default_handlers(struct gameport *gameport)
+{
+	if ((!gameport->trigger || !gameport->read) &&
+	    !IS_ENABLED(CONFIG_HAS_IOPORT))
+		dev_err(&gameport->dev,
+			"I/O port access is required for %s (%s) but is not available\n",
+			gameport->phys, gameport->name);
+
+	if (!gameport->trigger)
+		gameport->trigger = gameport_default_trigger;
+	if (!gameport->read)
+		gameport->read = gameport_default_read;
 }
 
 /*
@@ -545,11 +565,7 @@ static void gameport_init_port(struct gameport *gameport)
 	if (gameport->parent)
 		gameport->dev.parent = &gameport->parent->dev;
 
-	if (!gameport->trigger)
-		gameport->trigger = gameport_default_trigger;
-	if (!gameport->read)
-		gameport->read = gameport_default_read;
-
+	gameport_setup_default_handlers(gameport);
 	INIT_LIST_HEAD(&gameport->node);
 	spin_lock_init(&gameport->timer_lock);
 	timer_setup(&gameport->poll_timer, gameport_run_poll_handler, 0);