[PATCH v6 1/1] Input: gameport: add ISA and HAS_IOPORT dependencies

[Niklas Schnelle <schnelle@linux.ibm.com>]

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>
---
 drivers/input/gameport/Kconfig    |  4 +++-
 drivers/input/gameport/gameport.c | 28 +++++++++++++++++++++++-----
 2 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/drivers/input/gameport/Kconfig b/drivers/input/gameport/Kconfig
index 5a2c2fb3217d..fe73b26e647a 100644
--- a/drivers/input/gameport/Kconfig
+++ b/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,
diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index a1443320b419..bee935211554 100644
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -519,12 +519,34 @@ 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)
+		return;
+
+	if (!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 +567,7 @@ 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);
-- 
2.39.2