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[v5,16/44] Input: gameport: add ISA and HAS_IOPORT dependencies

Message ID 20230522105049.1467313-17-schnelle@linux.ibm.com (mailing list archive)
State Under Review
Headers show
Series None | expand

Commit Message

Niklas Schnelle May 22, 2023, 10:50 a.m. UTC 
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 +++-
 include/linux/gameport.h       | 9 +++++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

Comments

Dmitry Torokhov May 22, 2023, 10:16 p.m. UTC | #1 
Hi Niklas,

On Mon, May 22, 2023 at 12:50:21PM +0200, Niklas Schnelle wrote:
> diff --git a/include/linux/gameport.h b/include/linux/gameport.h
> index 8c2f00018e89..4d5720022b63 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

Contrary to the cover letter, this is still kind-of runtime detection
(i.e. broken drivers will silently stop working), we need to have
dev_err[_ratelimited?] here and below.

I also just posted a patch reworking this a bit so this and the chunk
below can be hidden in gameport.c.

Thanks.
diff mbox series

Patch

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 8c2f00018e89..4d5720022b63 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)