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Input: gameport - provide default trigger() and read()
Instead of constantly checking pointer(s) for non-NULL-ness provide default implementations of trigger() and read() and instantiate them during pore registration if driver-specific versions were not provided. Link: https://lore.kernel.org/r/ZGvoqP5PAAsJuky4@google.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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@ -11,6 +11,7 @@
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#include <linux/stddef.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/gameport.h>
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@ -21,8 +22,6 @@
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#include <linux/mutex.h>
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#include <linux/timekeeping.h>
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/*#include <asm/io.h>*/
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION("Generic gameport layer");
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MODULE_LICENSE("GPL");
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@ -518,6 +517,16 @@ void gameport_set_phys(struct gameport *gameport, const char *fmt, ...)
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}
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EXPORT_SYMBOL(gameport_set_phys);
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static void gameport_default_trigger(struct gameport *gameport)
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{
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outb(0xff, gameport->io);
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}
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static unsigned char gameport_default_read(struct gameport *gameport)
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{
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return inb(gameport->io);
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}
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/*
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* Prepare gameport port for registration.
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*/
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@ -536,6 +545,11 @@ static void gameport_init_port(struct gameport *gameport)
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if (gameport->parent)
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gameport->dev.parent = &gameport->parent->dev;
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if (!gameport->trigger)
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gameport->trigger = gameport_default_trigger;
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if (!gameport->read)
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gameport->read = gameport_default_read;
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INIT_LIST_HEAD(&gameport->node);
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spin_lock_init(&gameport->timer_lock);
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timer_setup(&gameport->poll_timer, gameport_run_poll_handler, 0);
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@ -5,7 +5,6 @@
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#ifndef _GAMEPORT_H
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#define _GAMEPORT_H
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#include <asm/io.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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@ -165,18 +164,12 @@ void gameport_unregister_driver(struct gameport_driver *drv);
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static inline void gameport_trigger(struct gameport *gameport)
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{
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if (gameport->trigger)
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gameport->trigger(gameport);
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else
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outb(0xff, gameport->io);
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gameport->trigger(gameport);
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}
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static inline unsigned char gameport_read(struct gameport *gameport)
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{
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if (gameport->read)
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return gameport->read(gameport);
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else
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return inb(gameport->io);
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return gameport->read(gameport);
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}
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static inline int gameport_cooked_read(struct gameport *gameport, int *axes, int *buttons)
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