linux-kernel - [RFC v2 15/39] Input: gameport: add ISA and HAS

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Message-Id: <20220429135108.2781579-28-schnelle@linux.ibm.com>
Date:   Fri, 29 Apr 2022 15:50:25 +0200
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-pci@...r.kernel.org, Arnd Bergmann <arnd@...nel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        linux-input@...r.kernel.org (open list:INPUT (KEYBOARD, MOUSE, JOYSTICK
        , TOUCHSCREEN)...)
Subject: [RFC v2 15/39] 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@...nel.org>
Signed-off-by: Niklas Schnelle <schnelle@...ux.ibm.com>
---
 drivers/input/gameport/Kconfig | 4 +++-
 include/linux/gameport.h       | 9 +++++++--
 2 files changed, 10 insertions(+), 3 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/include/linux/gameport.h b/include/linux/gameport.h
index 69081d899492..9e55ac748a86 100644
--- a/include/linux/gameport.h
+++ b/include/linux/gameport.h
@@ -167,16 +167,21 @@ static inline void gameport_trigger(struct gameport *gameport)
 {
 	if (gameport->trigger)
 		gameport->trigger(gameport);
+#ifdef CONFIG_HAS_IOPORT
 	else
 		outb(0xff, gameport->io);
+#endif
 }
 
 static inline unsigned char gameport_read(struct gameport *gameport)
 {
 	if (gameport->read)
 		return gameport->read(gameport);
-	else
-		return inb(gameport->io);
+#ifdef CONFIG_HAS_IOPORT
+	return inb(gameport->io);
+#else
+	return 0xff;
+#endif
 }
 
 static inline int gameport_cooked_read(struct gameport *gameport, int *axes, int *buttons)
-- 
2.32.0