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856 lines
20 KiB
856 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Generic gameport layer |
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* |
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* Copyright (c) 1999-2002 Vojtech Pavlik |
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* Copyright (c) 2005 Dmitry Torokhov |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/stddef.h> |
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#include <linux/module.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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#include <linux/slab.h> |
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#include <linux/delay.h> |
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#include <linux/workqueue.h> |
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#include <linux/sched.h> /* HZ */ |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Generic gameport layer"); |
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MODULE_LICENSE("GPL"); |
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static bool use_ktime = true; |
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module_param(use_ktime, bool, 0400); |
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MODULE_PARM_DESC(use_ktime, "Use ktime for measuring I/O speed"); |
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/* |
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* gameport_mutex protects entire gameport subsystem and is taken |
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* every time gameport port or driver registrered or unregistered. |
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*/ |
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static DEFINE_MUTEX(gameport_mutex); |
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static LIST_HEAD(gameport_list); |
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static struct bus_type gameport_bus; |
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static void gameport_add_port(struct gameport *gameport); |
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static void gameport_attach_driver(struct gameport_driver *drv); |
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static void gameport_reconnect_port(struct gameport *gameport); |
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static void gameport_disconnect_port(struct gameport *gameport); |
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#if defined(__i386__) |
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#include <linux/i8253.h> |
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#define DELTA(x,y) ((y)-(x)+((y)<(x)?1193182/HZ:0)) |
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#define GET_TIME(x) do { x = get_time_pit(); } while (0) |
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static unsigned int get_time_pit(void) |
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{ |
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unsigned long flags; |
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unsigned int count; |
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raw_spin_lock_irqsave(&i8253_lock, flags); |
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outb_p(0x00, 0x43); |
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count = inb_p(0x40); |
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count |= inb_p(0x40) << 8; |
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raw_spin_unlock_irqrestore(&i8253_lock, flags); |
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return count; |
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} |
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#endif |
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/* |
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* gameport_measure_speed() measures the gameport i/o speed. |
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*/ |
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static int gameport_measure_speed(struct gameport *gameport) |
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{ |
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unsigned int i, t, tx; |
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u64 t1, t2, t3; |
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unsigned long flags; |
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if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) |
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return 0; |
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tx = ~0; |
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for (i = 0; i < 50; i++) { |
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local_irq_save(flags); |
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t1 = ktime_get_ns(); |
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for (t = 0; t < 50; t++) |
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gameport_read(gameport); |
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t2 = ktime_get_ns(); |
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t3 = ktime_get_ns(); |
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local_irq_restore(flags); |
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udelay(i * 10); |
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t = (t2 - t1) - (t3 - t2); |
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if (t < tx) |
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tx = t; |
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} |
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gameport_close(gameport); |
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t = 1000000 * 50; |
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if (tx) |
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t /= tx; |
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return t; |
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} |
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static int old_gameport_measure_speed(struct gameport *gameport) |
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{ |
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#if defined(__i386__) |
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unsigned int i, t, t1, t2, t3, tx; |
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unsigned long flags; |
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if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) |
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return 0; |
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tx = 1 << 30; |
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for(i = 0; i < 50; i++) { |
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local_irq_save(flags); |
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GET_TIME(t1); |
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for (t = 0; t < 50; t++) gameport_read(gameport); |
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GET_TIME(t2); |
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GET_TIME(t3); |
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local_irq_restore(flags); |
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udelay(i * 10); |
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if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t; |
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} |
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gameport_close(gameport); |
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return 59659 / (tx < 1 ? 1 : tx); |
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#elif defined (__x86_64__) |
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unsigned int i, t; |
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unsigned long tx, t1, t2, flags; |
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if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) |
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return 0; |
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tx = 1 << 30; |
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for(i = 0; i < 50; i++) { |
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local_irq_save(flags); |
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t1 = rdtsc(); |
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for (t = 0; t < 50; t++) gameport_read(gameport); |
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t2 = rdtsc(); |
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local_irq_restore(flags); |
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udelay(i * 10); |
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if (t2 - t1 < tx) tx = t2 - t1; |
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} |
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gameport_close(gameport); |
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return (this_cpu_read(cpu_info.loops_per_jiffy) * |
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(unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx); |
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#else |
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unsigned int j, t = 0; |
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if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW)) |
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return 0; |
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j = jiffies; while (j == jiffies); |
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j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); } |
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gameport_close(gameport); |
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return t * HZ / 1000; |
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#endif |
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} |
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void gameport_start_polling(struct gameport *gameport) |
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{ |
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spin_lock(&gameport->timer_lock); |
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if (!gameport->poll_cnt++) { |
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BUG_ON(!gameport->poll_handler); |
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BUG_ON(!gameport->poll_interval); |
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mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); |
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} |
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spin_unlock(&gameport->timer_lock); |
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} |
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EXPORT_SYMBOL(gameport_start_polling); |
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void gameport_stop_polling(struct gameport *gameport) |
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{ |
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spin_lock(&gameport->timer_lock); |
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if (!--gameport->poll_cnt) |
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del_timer(&gameport->poll_timer); |
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spin_unlock(&gameport->timer_lock); |
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} |
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EXPORT_SYMBOL(gameport_stop_polling); |
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static void gameport_run_poll_handler(struct timer_list *t) |
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{ |
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struct gameport *gameport = from_timer(gameport, t, poll_timer); |
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gameport->poll_handler(gameport); |
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if (gameport->poll_cnt) |
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mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval)); |
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} |
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/* |
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* Basic gameport -> driver core mappings |
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*/ |
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static int gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv) |
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{ |
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int error; |
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gameport->dev.driver = &drv->driver; |
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if (drv->connect(gameport, drv)) { |
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gameport->dev.driver = NULL; |
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return -ENODEV; |
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} |
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error = device_bind_driver(&gameport->dev); |
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if (error) { |
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dev_warn(&gameport->dev, |
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"device_bind_driver() failed for %s (%s) and %s, error: %d\n", |
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gameport->phys, gameport->name, |
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drv->description, error); |
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drv->disconnect(gameport); |
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gameport->dev.driver = NULL; |
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return error; |
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} |
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return 0; |
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} |
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static void gameport_find_driver(struct gameport *gameport) |
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{ |
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int error; |
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error = device_attach(&gameport->dev); |
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if (error < 0) |
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dev_warn(&gameport->dev, |
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"device_attach() failed for %s (%s), error: %d\n", |
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gameport->phys, gameport->name, error); |
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} |
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/* |
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* Gameport event processing. |
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*/ |
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enum gameport_event_type { |
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GAMEPORT_REGISTER_PORT, |
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GAMEPORT_ATTACH_DRIVER, |
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}; |
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struct gameport_event { |
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enum gameport_event_type type; |
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void *object; |
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struct module *owner; |
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struct list_head node; |
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}; |
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static DEFINE_SPINLOCK(gameport_event_lock); /* protects gameport_event_list */ |
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static LIST_HEAD(gameport_event_list); |
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static struct gameport_event *gameport_get_event(void) |
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{ |
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struct gameport_event *event = NULL; |
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unsigned long flags; |
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spin_lock_irqsave(&gameport_event_lock, flags); |
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if (!list_empty(&gameport_event_list)) { |
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event = list_first_entry(&gameport_event_list, |
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struct gameport_event, node); |
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list_del_init(&event->node); |
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} |
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spin_unlock_irqrestore(&gameport_event_lock, flags); |
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return event; |
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} |
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static void gameport_free_event(struct gameport_event *event) |
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{ |
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module_put(event->owner); |
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kfree(event); |
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} |
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static void gameport_remove_duplicate_events(struct gameport_event *event) |
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{ |
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struct gameport_event *e, *next; |
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unsigned long flags; |
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spin_lock_irqsave(&gameport_event_lock, flags); |
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list_for_each_entry_safe(e, next, &gameport_event_list, node) { |
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if (event->object == e->object) { |
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/* |
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* If this event is of different type we should not |
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* look further - we only suppress duplicate events |
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* that were sent back-to-back. |
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*/ |
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if (event->type != e->type) |
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break; |
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list_del_init(&e->node); |
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gameport_free_event(e); |
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} |
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} |
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spin_unlock_irqrestore(&gameport_event_lock, flags); |
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} |
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static void gameport_handle_events(struct work_struct *work) |
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{ |
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struct gameport_event *event; |
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mutex_lock(&gameport_mutex); |
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/* |
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* Note that we handle only one event here to give swsusp |
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* a chance to freeze kgameportd thread. Gameport events |
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* should be pretty rare so we are not concerned about |
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* taking performance hit. |
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*/ |
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if ((event = gameport_get_event())) { |
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switch (event->type) { |
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case GAMEPORT_REGISTER_PORT: |
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gameport_add_port(event->object); |
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break; |
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case GAMEPORT_ATTACH_DRIVER: |
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gameport_attach_driver(event->object); |
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break; |
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} |
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gameport_remove_duplicate_events(event); |
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gameport_free_event(event); |
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} |
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mutex_unlock(&gameport_mutex); |
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} |
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static DECLARE_WORK(gameport_event_work, gameport_handle_events); |
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static int gameport_queue_event(void *object, struct module *owner, |
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enum gameport_event_type event_type) |
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{ |
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unsigned long flags; |
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struct gameport_event *event; |
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int retval = 0; |
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spin_lock_irqsave(&gameport_event_lock, flags); |
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/* |
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* Scan event list for the other events for the same gameport port, |
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* starting with the most recent one. If event is the same we |
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* do not need add new one. If event is of different type we |
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* need to add this event and should not look further because |
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* we need to preserve sequence of distinct events. |
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*/ |
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list_for_each_entry_reverse(event, &gameport_event_list, node) { |
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if (event->object == object) { |
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if (event->type == event_type) |
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goto out; |
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break; |
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} |
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} |
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event = kmalloc(sizeof(struct gameport_event), GFP_ATOMIC); |
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if (!event) { |
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pr_err("Not enough memory to queue event %d\n", event_type); |
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retval = -ENOMEM; |
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goto out; |
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} |
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if (!try_module_get(owner)) { |
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pr_warn("Can't get module reference, dropping event %d\n", |
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event_type); |
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kfree(event); |
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retval = -EINVAL; |
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goto out; |
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} |
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event->type = event_type; |
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event->object = object; |
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event->owner = owner; |
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list_add_tail(&event->node, &gameport_event_list); |
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queue_work(system_long_wq, &gameport_event_work); |
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out: |
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spin_unlock_irqrestore(&gameport_event_lock, flags); |
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return retval; |
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} |
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/* |
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* Remove all events that have been submitted for a given object, |
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* be it a gameport port or a driver. |
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*/ |
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static void gameport_remove_pending_events(void *object) |
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{ |
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struct gameport_event *event, *next; |
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unsigned long flags; |
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spin_lock_irqsave(&gameport_event_lock, flags); |
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list_for_each_entry_safe(event, next, &gameport_event_list, node) { |
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if (event->object == object) { |
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list_del_init(&event->node); |
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gameport_free_event(event); |
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} |
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} |
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spin_unlock_irqrestore(&gameport_event_lock, flags); |
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} |
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/* |
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* Destroy child gameport port (if any) that has not been fully registered yet. |
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* |
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* Note that we rely on the fact that port can have only one child and therefore |
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* only one child registration request can be pending. Additionally, children |
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* are registered by driver's connect() handler so there can't be a grandchild |
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* pending registration together with a child. |
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*/ |
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static struct gameport *gameport_get_pending_child(struct gameport *parent) |
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{ |
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struct gameport_event *event; |
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struct gameport *gameport, *child = NULL; |
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unsigned long flags; |
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spin_lock_irqsave(&gameport_event_lock, flags); |
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list_for_each_entry(event, &gameport_event_list, node) { |
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if (event->type == GAMEPORT_REGISTER_PORT) { |
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gameport = event->object; |
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if (gameport->parent == parent) { |
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child = gameport; |
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break; |
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} |
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} |
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} |
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spin_unlock_irqrestore(&gameport_event_lock, flags); |
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return child; |
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} |
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/* |
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* Gameport port operations |
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*/ |
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static ssize_t gameport_description_show(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct gameport *gameport = to_gameport_port(dev); |
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return sprintf(buf, "%s\n", gameport->name); |
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} |
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static DEVICE_ATTR(description, S_IRUGO, gameport_description_show, NULL); |
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static ssize_t drvctl_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
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{ |
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struct gameport *gameport = to_gameport_port(dev); |
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struct device_driver *drv; |
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int error; |
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error = mutex_lock_interruptible(&gameport_mutex); |
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if (error) |
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return error; |
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if (!strncmp(buf, "none", count)) { |
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gameport_disconnect_port(gameport); |
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} else if (!strncmp(buf, "reconnect", count)) { |
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gameport_reconnect_port(gameport); |
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} else if (!strncmp(buf, "rescan", count)) { |
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gameport_disconnect_port(gameport); |
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gameport_find_driver(gameport); |
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} else if ((drv = driver_find(buf, &gameport_bus)) != NULL) { |
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gameport_disconnect_port(gameport); |
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error = gameport_bind_driver(gameport, to_gameport_driver(drv)); |
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} else { |
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error = -EINVAL; |
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} |
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mutex_unlock(&gameport_mutex); |
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return error ? error : count; |
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} |
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static DEVICE_ATTR_WO(drvctl); |
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static struct attribute *gameport_device_attrs[] = { |
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&dev_attr_description.attr, |
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&dev_attr_drvctl.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(gameport_device); |
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static void gameport_release_port(struct device *dev) |
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{ |
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struct gameport *gameport = to_gameport_port(dev); |
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kfree(gameport); |
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module_put(THIS_MODULE); |
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} |
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void gameport_set_phys(struct gameport *gameport, const char *fmt, ...) |
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{ |
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va_list args; |
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va_start(args, fmt); |
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vsnprintf(gameport->phys, sizeof(gameport->phys), fmt, args); |
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va_end(args); |
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} |
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EXPORT_SYMBOL(gameport_set_phys); |
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/* |
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* Prepare gameport port for registration. |
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*/ |
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static void gameport_init_port(struct gameport *gameport) |
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{ |
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static atomic_t gameport_no = ATOMIC_INIT(-1); |
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__module_get(THIS_MODULE); |
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mutex_init(&gameport->drv_mutex); |
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device_initialize(&gameport->dev); |
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dev_set_name(&gameport->dev, "gameport%lu", |
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(unsigned long)atomic_inc_return(&gameport_no)); |
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gameport->dev.bus = &gameport_bus; |
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gameport->dev.release = gameport_release_port; |
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if (gameport->parent) |
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gameport->dev.parent = &gameport->parent->dev; |
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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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} |
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/* |
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* Complete gameport port registration. |
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* Driver core will attempt to find appropriate driver for the port. |
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*/ |
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static void gameport_add_port(struct gameport *gameport) |
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{ |
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int error; |
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if (gameport->parent) |
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gameport->parent->child = gameport; |
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gameport->speed = use_ktime ? |
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gameport_measure_speed(gameport) : |
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old_gameport_measure_speed(gameport); |
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list_add_tail(&gameport->node, &gameport_list); |
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if (gameport->io) |
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dev_info(&gameport->dev, "%s is %s, io %#x, speed %dkHz\n", |
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gameport->name, gameport->phys, gameport->io, gameport->speed); |
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else |
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dev_info(&gameport->dev, "%s is %s, speed %dkHz\n", |
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gameport->name, gameport->phys, gameport->speed); |
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error = device_add(&gameport->dev); |
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if (error) |
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dev_err(&gameport->dev, |
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"device_add() failed for %s (%s), error: %d\n", |
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gameport->phys, gameport->name, error); |
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} |
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/* |
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* gameport_destroy_port() completes deregistration process and removes |
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* port from the system |
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*/ |
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static void gameport_destroy_port(struct gameport *gameport) |
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{ |
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struct gameport *child; |
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child = gameport_get_pending_child(gameport); |
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if (child) { |
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gameport_remove_pending_events(child); |
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put_device(&child->dev); |
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} |
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if (gameport->parent) { |
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gameport->parent->child = NULL; |
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gameport->parent = NULL; |
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} |
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if (device_is_registered(&gameport->dev)) |
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device_del(&gameport->dev); |
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list_del_init(&gameport->node); |
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gameport_remove_pending_events(gameport); |
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put_device(&gameport->dev); |
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} |
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/* |
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* Reconnect gameport port and all its children (re-initialize attached devices) |
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*/ |
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static void gameport_reconnect_port(struct gameport *gameport) |
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{ |
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do { |
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if (!gameport->drv || !gameport->drv->reconnect || gameport->drv->reconnect(gameport)) { |
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gameport_disconnect_port(gameport); |
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gameport_find_driver(gameport); |
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/* Ok, old children are now gone, we are done */ |
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break; |
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} |
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gameport = gameport->child; |
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} while (gameport); |
|
} |
|
|
|
/* |
|
* gameport_disconnect_port() unbinds a port from its driver. As a side effect |
|
* all child ports are unbound and destroyed. |
|
*/ |
|
static void gameport_disconnect_port(struct gameport *gameport) |
|
{ |
|
struct gameport *s, *parent; |
|
|
|
if (gameport->child) { |
|
/* |
|
* Children ports should be disconnected and destroyed |
|
* first, staring with the leaf one, since we don't want |
|
* to do recursion |
|
*/ |
|
for (s = gameport; s->child; s = s->child) |
|
/* empty */; |
|
|
|
do { |
|
parent = s->parent; |
|
|
|
device_release_driver(&s->dev); |
|
gameport_destroy_port(s); |
|
} while ((s = parent) != gameport); |
|
} |
|
|
|
/* |
|
* Ok, no children left, now disconnect this port |
|
*/ |
|
device_release_driver(&gameport->dev); |
|
} |
|
|
|
/* |
|
* Submits register request to kgameportd for subsequent execution. |
|
* Note that port registration is always asynchronous. |
|
*/ |
|
void __gameport_register_port(struct gameport *gameport, struct module *owner) |
|
{ |
|
gameport_init_port(gameport); |
|
gameport_queue_event(gameport, owner, GAMEPORT_REGISTER_PORT); |
|
} |
|
EXPORT_SYMBOL(__gameport_register_port); |
|
|
|
/* |
|
* Synchronously unregisters gameport port. |
|
*/ |
|
void gameport_unregister_port(struct gameport *gameport) |
|
{ |
|
mutex_lock(&gameport_mutex); |
|
gameport_disconnect_port(gameport); |
|
gameport_destroy_port(gameport); |
|
mutex_unlock(&gameport_mutex); |
|
} |
|
EXPORT_SYMBOL(gameport_unregister_port); |
|
|
|
|
|
/* |
|
* Gameport driver operations |
|
*/ |
|
|
|
static ssize_t description_show(struct device_driver *drv, char *buf) |
|
{ |
|
struct gameport_driver *driver = to_gameport_driver(drv); |
|
return sprintf(buf, "%s\n", driver->description ? driver->description : "(none)"); |
|
} |
|
static DRIVER_ATTR_RO(description); |
|
|
|
static struct attribute *gameport_driver_attrs[] = { |
|
&driver_attr_description.attr, |
|
NULL |
|
}; |
|
ATTRIBUTE_GROUPS(gameport_driver); |
|
|
|
static int gameport_driver_probe(struct device *dev) |
|
{ |
|
struct gameport *gameport = to_gameport_port(dev); |
|
struct gameport_driver *drv = to_gameport_driver(dev->driver); |
|
|
|
drv->connect(gameport, drv); |
|
return gameport->drv ? 0 : -ENODEV; |
|
} |
|
|
|
static int gameport_driver_remove(struct device *dev) |
|
{ |
|
struct gameport *gameport = to_gameport_port(dev); |
|
struct gameport_driver *drv = to_gameport_driver(dev->driver); |
|
|
|
drv->disconnect(gameport); |
|
return 0; |
|
} |
|
|
|
static void gameport_attach_driver(struct gameport_driver *drv) |
|
{ |
|
int error; |
|
|
|
error = driver_attach(&drv->driver); |
|
if (error) |
|
pr_err("driver_attach() failed for %s, error: %d\n", |
|
drv->driver.name, error); |
|
} |
|
|
|
int __gameport_register_driver(struct gameport_driver *drv, struct module *owner, |
|
const char *mod_name) |
|
{ |
|
int error; |
|
|
|
drv->driver.bus = &gameport_bus; |
|
drv->driver.owner = owner; |
|
drv->driver.mod_name = mod_name; |
|
|
|
/* |
|
* Temporarily disable automatic binding because probing |
|
* takes long time and we are better off doing it in kgameportd |
|
*/ |
|
drv->ignore = true; |
|
|
|
error = driver_register(&drv->driver); |
|
if (error) { |
|
pr_err("driver_register() failed for %s, error: %d\n", |
|
drv->driver.name, error); |
|
return error; |
|
} |
|
|
|
/* |
|
* Reset ignore flag and let kgameportd bind the driver to free ports |
|
*/ |
|
drv->ignore = false; |
|
error = gameport_queue_event(drv, NULL, GAMEPORT_ATTACH_DRIVER); |
|
if (error) { |
|
driver_unregister(&drv->driver); |
|
return error; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(__gameport_register_driver); |
|
|
|
void gameport_unregister_driver(struct gameport_driver *drv) |
|
{ |
|
struct gameport *gameport; |
|
|
|
mutex_lock(&gameport_mutex); |
|
|
|
drv->ignore = true; /* so gameport_find_driver ignores it */ |
|
gameport_remove_pending_events(drv); |
|
|
|
start_over: |
|
list_for_each_entry(gameport, &gameport_list, node) { |
|
if (gameport->drv == drv) { |
|
gameport_disconnect_port(gameport); |
|
gameport_find_driver(gameport); |
|
/* we could've deleted some ports, restart */ |
|
goto start_over; |
|
} |
|
} |
|
|
|
driver_unregister(&drv->driver); |
|
|
|
mutex_unlock(&gameport_mutex); |
|
} |
|
EXPORT_SYMBOL(gameport_unregister_driver); |
|
|
|
static int gameport_bus_match(struct device *dev, struct device_driver *drv) |
|
{ |
|
struct gameport_driver *gameport_drv = to_gameport_driver(drv); |
|
|
|
return !gameport_drv->ignore; |
|
} |
|
|
|
static struct bus_type gameport_bus = { |
|
.name = "gameport", |
|
.dev_groups = gameport_device_groups, |
|
.drv_groups = gameport_driver_groups, |
|
.match = gameport_bus_match, |
|
.probe = gameport_driver_probe, |
|
.remove = gameport_driver_remove, |
|
}; |
|
|
|
static void gameport_set_drv(struct gameport *gameport, struct gameport_driver *drv) |
|
{ |
|
mutex_lock(&gameport->drv_mutex); |
|
gameport->drv = drv; |
|
mutex_unlock(&gameport->drv_mutex); |
|
} |
|
|
|
int gameport_open(struct gameport *gameport, struct gameport_driver *drv, int mode) |
|
{ |
|
if (gameport->open) { |
|
if (gameport->open(gameport, mode)) { |
|
return -1; |
|
} |
|
} else { |
|
if (mode != GAMEPORT_MODE_RAW) |
|
return -1; |
|
} |
|
|
|
gameport_set_drv(gameport, drv); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(gameport_open); |
|
|
|
void gameport_close(struct gameport *gameport) |
|
{ |
|
del_timer_sync(&gameport->poll_timer); |
|
gameport->poll_handler = NULL; |
|
gameport->poll_interval = 0; |
|
gameport_set_drv(gameport, NULL); |
|
if (gameport->close) |
|
gameport->close(gameport); |
|
} |
|
EXPORT_SYMBOL(gameport_close); |
|
|
|
static int __init gameport_init(void) |
|
{ |
|
int error; |
|
|
|
error = bus_register(&gameport_bus); |
|
if (error) { |
|
pr_err("failed to register gameport bus, error: %d\n", error); |
|
return error; |
|
} |
|
|
|
|
|
return 0; |
|
} |
|
|
|
static void __exit gameport_exit(void) |
|
{ |
|
bus_unregister(&gameport_bus); |
|
|
|
/* |
|
* There should not be any outstanding events but work may |
|
* still be scheduled so simply cancel it. |
|
*/ |
|
cancel_work_sync(&gameport_event_work); |
|
} |
|
|
|
subsys_initcall(gameport_init); |
|
module_exit(gameport_exit);
|
|
|