798 lines
19 KiB
C
798 lines
19 KiB
C
/*
|
|
* Generic gameport layer
|
|
*
|
|
* Copyright (c) 1999-2002 Vojtech Pavlik
|
|
* Copyright (c) 2005 Dmitry Torokhov
|
|
*/
|
|
|
|
/*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/stddef.h>
|
|
#include <linux/module.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/init.h>
|
|
#include <linux/gameport.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/smp_lock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/delay.h>
|
|
|
|
/*#include <asm/io.h>*/
|
|
|
|
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
|
|
MODULE_DESCRIPTION("Generic gameport layer");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
EXPORT_SYMBOL(__gameport_register_port);
|
|
EXPORT_SYMBOL(gameport_unregister_port);
|
|
EXPORT_SYMBOL(__gameport_register_driver);
|
|
EXPORT_SYMBOL(gameport_unregister_driver);
|
|
EXPORT_SYMBOL(gameport_open);
|
|
EXPORT_SYMBOL(gameport_close);
|
|
EXPORT_SYMBOL(gameport_rescan);
|
|
EXPORT_SYMBOL(gameport_cooked_read);
|
|
EXPORT_SYMBOL(gameport_set_name);
|
|
EXPORT_SYMBOL(gameport_set_phys);
|
|
EXPORT_SYMBOL(gameport_start_polling);
|
|
EXPORT_SYMBOL(gameport_stop_polling);
|
|
|
|
/*
|
|
* gameport_sem protects entire gameport subsystem and is taken
|
|
* every time gameport port or driver registrered or unregistered.
|
|
*/
|
|
static DECLARE_MUTEX(gameport_sem);
|
|
|
|
static LIST_HEAD(gameport_list);
|
|
|
|
static struct bus_type gameport_bus = {
|
|
.name = "gameport",
|
|
};
|
|
|
|
static void gameport_add_port(struct gameport *gameport);
|
|
static void gameport_destroy_port(struct gameport *gameport);
|
|
static void gameport_reconnect_port(struct gameport *gameport);
|
|
static void gameport_disconnect_port(struct gameport *gameport);
|
|
|
|
#if defined(__i386__)
|
|
|
|
#define DELTA(x,y) ((y)-(x)+((y)<(x)?1193182/HZ:0))
|
|
#define GET_TIME(x) do { x = get_time_pit(); } while (0)
|
|
|
|
static unsigned int get_time_pit(void)
|
|
{
|
|
extern spinlock_t i8253_lock;
|
|
unsigned long flags;
|
|
unsigned int count;
|
|
|
|
spin_lock_irqsave(&i8253_lock, flags);
|
|
outb_p(0x00, 0x43);
|
|
count = inb_p(0x40);
|
|
count |= inb_p(0x40) << 8;
|
|
spin_unlock_irqrestore(&i8253_lock, flags);
|
|
|
|
return count;
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/*
|
|
* gameport_measure_speed() measures the gameport i/o speed.
|
|
*/
|
|
|
|
static int gameport_measure_speed(struct gameport *gameport)
|
|
{
|
|
#if defined(__i386__)
|
|
|
|
unsigned int i, t, t1, t2, t3, tx;
|
|
unsigned long flags;
|
|
|
|
if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW))
|
|
return 0;
|
|
|
|
tx = 1 << 30;
|
|
|
|
for(i = 0; i < 50; i++) {
|
|
local_irq_save(flags);
|
|
GET_TIME(t1);
|
|
for (t = 0; t < 50; t++) gameport_read(gameport);
|
|
GET_TIME(t2);
|
|
GET_TIME(t3);
|
|
local_irq_restore(flags);
|
|
udelay(i * 10);
|
|
if ((t = DELTA(t2,t1) - DELTA(t3,t2)) < tx) tx = t;
|
|
}
|
|
|
|
gameport_close(gameport);
|
|
return 59659 / (tx < 1 ? 1 : tx);
|
|
|
|
#elif defined (__x86_64__)
|
|
|
|
unsigned int i, t;
|
|
unsigned long tx, t1, t2, flags;
|
|
|
|
if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW))
|
|
return 0;
|
|
|
|
tx = 1 << 30;
|
|
|
|
for(i = 0; i < 50; i++) {
|
|
local_irq_save(flags);
|
|
rdtscl(t1);
|
|
for (t = 0; t < 50; t++) gameport_read(gameport);
|
|
rdtscl(t2);
|
|
local_irq_restore(flags);
|
|
udelay(i * 10);
|
|
if (t2 - t1 < tx) tx = t2 - t1;
|
|
}
|
|
|
|
gameport_close(gameport);
|
|
return (cpu_data[raw_smp_processor_id()].loops_per_jiffy * (unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx);
|
|
|
|
#else
|
|
|
|
unsigned int j, t = 0;
|
|
|
|
if (gameport_open(gameport, NULL, GAMEPORT_MODE_RAW))
|
|
return 0;
|
|
|
|
j = jiffies; while (j == jiffies);
|
|
j = jiffies; while (j == jiffies) { t++; gameport_read(gameport); }
|
|
|
|
gameport_close(gameport);
|
|
return t * HZ / 1000;
|
|
|
|
#endif
|
|
}
|
|
|
|
void gameport_start_polling(struct gameport *gameport)
|
|
{
|
|
spin_lock(&gameport->timer_lock);
|
|
|
|
if (!gameport->poll_cnt++) {
|
|
BUG_ON(!gameport->poll_handler);
|
|
BUG_ON(!gameport->poll_interval);
|
|
mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval));
|
|
}
|
|
|
|
spin_unlock(&gameport->timer_lock);
|
|
}
|
|
|
|
void gameport_stop_polling(struct gameport *gameport)
|
|
{
|
|
spin_lock(&gameport->timer_lock);
|
|
|
|
if (!--gameport->poll_cnt)
|
|
del_timer(&gameport->poll_timer);
|
|
|
|
spin_unlock(&gameport->timer_lock);
|
|
}
|
|
|
|
static void gameport_run_poll_handler(unsigned long d)
|
|
{
|
|
struct gameport *gameport = (struct gameport *)d;
|
|
|
|
gameport->poll_handler(gameport);
|
|
if (gameport->poll_cnt)
|
|
mod_timer(&gameport->poll_timer, jiffies + msecs_to_jiffies(gameport->poll_interval));
|
|
}
|
|
|
|
/*
|
|
* Basic gameport -> driver core mappings
|
|
*/
|
|
|
|
static void gameport_bind_driver(struct gameport *gameport, struct gameport_driver *drv)
|
|
{
|
|
down_write(&gameport_bus.subsys.rwsem);
|
|
|
|
gameport->dev.driver = &drv->driver;
|
|
if (drv->connect(gameport, drv)) {
|
|
gameport->dev.driver = NULL;
|
|
goto out;
|
|
}
|
|
device_bind_driver(&gameport->dev);
|
|
out:
|
|
up_write(&gameport_bus.subsys.rwsem);
|
|
}
|
|
|
|
static void gameport_release_driver(struct gameport *gameport)
|
|
{
|
|
down_write(&gameport_bus.subsys.rwsem);
|
|
device_release_driver(&gameport->dev);
|
|
up_write(&gameport_bus.subsys.rwsem);
|
|
}
|
|
|
|
static void gameport_find_driver(struct gameport *gameport)
|
|
{
|
|
down_write(&gameport_bus.subsys.rwsem);
|
|
device_attach(&gameport->dev);
|
|
up_write(&gameport_bus.subsys.rwsem);
|
|
}
|
|
|
|
|
|
/*
|
|
* Gameport event processing.
|
|
*/
|
|
|
|
enum gameport_event_type {
|
|
GAMEPORT_RESCAN,
|
|
GAMEPORT_RECONNECT,
|
|
GAMEPORT_REGISTER_PORT,
|
|
GAMEPORT_REGISTER_DRIVER,
|
|
};
|
|
|
|
struct gameport_event {
|
|
enum gameport_event_type type;
|
|
void *object;
|
|
struct module *owner;
|
|
struct list_head node;
|
|
};
|
|
|
|
static DEFINE_SPINLOCK(gameport_event_lock); /* protects gameport_event_list */
|
|
static LIST_HEAD(gameport_event_list);
|
|
static DECLARE_WAIT_QUEUE_HEAD(gameport_wait);
|
|
static DECLARE_COMPLETION(gameport_exited);
|
|
static int gameport_pid;
|
|
|
|
static void gameport_queue_event(void *object, struct module *owner,
|
|
enum gameport_event_type event_type)
|
|
{
|
|
unsigned long flags;
|
|
struct gameport_event *event;
|
|
|
|
spin_lock_irqsave(&gameport_event_lock, flags);
|
|
|
|
/*
|
|
* Scan event list for the other events for the same gameport port,
|
|
* starting with the most recent one. If event is the same we
|
|
* do not need add new one. If event is of different type we
|
|
* need to add this event and should not look further because
|
|
* we need to preseve sequence of distinct events.
|
|
*/
|
|
list_for_each_entry_reverse(event, &gameport_event_list, node) {
|
|
if (event->object == object) {
|
|
if (event->type == event_type)
|
|
goto out;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((event = kmalloc(sizeof(struct gameport_event), GFP_ATOMIC))) {
|
|
if (!try_module_get(owner)) {
|
|
printk(KERN_WARNING "gameport: Can't get module reference, dropping event %d\n", event_type);
|
|
goto out;
|
|
}
|
|
|
|
event->type = event_type;
|
|
event->object = object;
|
|
event->owner = owner;
|
|
|
|
list_add_tail(&event->node, &gameport_event_list);
|
|
wake_up(&gameport_wait);
|
|
} else {
|
|
printk(KERN_ERR "gameport: Not enough memory to queue event %d\n", event_type);
|
|
}
|
|
out:
|
|
spin_unlock_irqrestore(&gameport_event_lock, flags);
|
|
}
|
|
|
|
static void gameport_free_event(struct gameport_event *event)
|
|
{
|
|
module_put(event->owner);
|
|
kfree(event);
|
|
}
|
|
|
|
static void gameport_remove_duplicate_events(struct gameport_event *event)
|
|
{
|
|
struct list_head *node, *next;
|
|
struct gameport_event *e;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&gameport_event_lock, flags);
|
|
|
|
list_for_each_safe(node, next, &gameport_event_list) {
|
|
e = list_entry(node, struct gameport_event, node);
|
|
if (event->object == e->object) {
|
|
/*
|
|
* If this event is of different type we should not
|
|
* look further - we only suppress duplicate events
|
|
* that were sent back-to-back.
|
|
*/
|
|
if (event->type != e->type)
|
|
break;
|
|
|
|
list_del_init(node);
|
|
gameport_free_event(e);
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&gameport_event_lock, flags);
|
|
}
|
|
|
|
|
|
static struct gameport_event *gameport_get_event(void)
|
|
{
|
|
struct gameport_event *event;
|
|
struct list_head *node;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&gameport_event_lock, flags);
|
|
|
|
if (list_empty(&gameport_event_list)) {
|
|
spin_unlock_irqrestore(&gameport_event_lock, flags);
|
|
return NULL;
|
|
}
|
|
|
|
node = gameport_event_list.next;
|
|
event = list_entry(node, struct gameport_event, node);
|
|
list_del_init(node);
|
|
|
|
spin_unlock_irqrestore(&gameport_event_lock, flags);
|
|
|
|
return event;
|
|
}
|
|
|
|
static void gameport_handle_events(void)
|
|
{
|
|
struct gameport_event *event;
|
|
struct gameport_driver *gameport_drv;
|
|
|
|
down(&gameport_sem);
|
|
|
|
while ((event = gameport_get_event())) {
|
|
|
|
switch (event->type) {
|
|
case GAMEPORT_REGISTER_PORT:
|
|
gameport_add_port(event->object);
|
|
break;
|
|
|
|
case GAMEPORT_RECONNECT:
|
|
gameport_reconnect_port(event->object);
|
|
break;
|
|
|
|
case GAMEPORT_RESCAN:
|
|
gameport_disconnect_port(event->object);
|
|
gameport_find_driver(event->object);
|
|
break;
|
|
|
|
case GAMEPORT_REGISTER_DRIVER:
|
|
gameport_drv = event->object;
|
|
driver_register(&gameport_drv->driver);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
gameport_remove_duplicate_events(event);
|
|
gameport_free_event(event);
|
|
}
|
|
|
|
up(&gameport_sem);
|
|
}
|
|
|
|
/*
|
|
* Remove all events that have been submitted for a given gameport port.
|
|
*/
|
|
static void gameport_remove_pending_events(struct gameport *gameport)
|
|
{
|
|
struct list_head *node, *next;
|
|
struct gameport_event *event;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&gameport_event_lock, flags);
|
|
|
|
list_for_each_safe(node, next, &gameport_event_list) {
|
|
event = list_entry(node, struct gameport_event, node);
|
|
if (event->object == gameport) {
|
|
list_del_init(node);
|
|
gameport_free_event(event);
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&gameport_event_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Destroy child gameport port (if any) that has not been fully registered yet.
|
|
*
|
|
* Note that we rely on the fact that port can have only one child and therefore
|
|
* only one child registration request can be pending. Additionally, children
|
|
* are registered by driver's connect() handler so there can't be a grandchild
|
|
* pending registration together with a child.
|
|
*/
|
|
static struct gameport *gameport_get_pending_child(struct gameport *parent)
|
|
{
|
|
struct gameport_event *event;
|
|
struct gameport *gameport, *child = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&gameport_event_lock, flags);
|
|
|
|
list_for_each_entry(event, &gameport_event_list, node) {
|
|
if (event->type == GAMEPORT_REGISTER_PORT) {
|
|
gameport = event->object;
|
|
if (gameport->parent == parent) {
|
|
child = gameport;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&gameport_event_lock, flags);
|
|
return child;
|
|
}
|
|
|
|
static int gameport_thread(void *nothing)
|
|
{
|
|
lock_kernel();
|
|
daemonize("kgameportd");
|
|
allow_signal(SIGTERM);
|
|
|
|
do {
|
|
gameport_handle_events();
|
|
wait_event_interruptible(gameport_wait, !list_empty(&gameport_event_list));
|
|
try_to_freeze(PF_FREEZE);
|
|
} while (!signal_pending(current));
|
|
|
|
printk(KERN_DEBUG "gameport: kgameportd exiting\n");
|
|
|
|
unlock_kernel();
|
|
complete_and_exit(&gameport_exited, 0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Gameport port operations
|
|
*/
|
|
|
|
static ssize_t gameport_show_description(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct gameport *gameport = to_gameport_port(dev);
|
|
return sprintf(buf, "%s\n", gameport->name);
|
|
}
|
|
|
|
static ssize_t gameport_rebind_driver(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct gameport *gameport = to_gameport_port(dev);
|
|
struct device_driver *drv;
|
|
int retval;
|
|
|
|
retval = down_interruptible(&gameport_sem);
|
|
if (retval)
|
|
return retval;
|
|
|
|
retval = count;
|
|
if (!strncmp(buf, "none", count)) {
|
|
gameport_disconnect_port(gameport);
|
|
} else if (!strncmp(buf, "reconnect", count)) {
|
|
gameport_reconnect_port(gameport);
|
|
} else if (!strncmp(buf, "rescan", count)) {
|
|
gameport_disconnect_port(gameport);
|
|
gameport_find_driver(gameport);
|
|
} else if ((drv = driver_find(buf, &gameport_bus)) != NULL) {
|
|
gameport_disconnect_port(gameport);
|
|
gameport_bind_driver(gameport, to_gameport_driver(drv));
|
|
put_driver(drv);
|
|
} else {
|
|
retval = -EINVAL;
|
|
}
|
|
|
|
up(&gameport_sem);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static struct device_attribute gameport_device_attrs[] = {
|
|
__ATTR(description, S_IRUGO, gameport_show_description, NULL),
|
|
__ATTR(drvctl, S_IWUSR, NULL, gameport_rebind_driver),
|
|
__ATTR_NULL
|
|
};
|
|
|
|
static void gameport_release_port(struct device *dev)
|
|
{
|
|
struct gameport *gameport = to_gameport_port(dev);
|
|
|
|
kfree(gameport);
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
void gameport_set_phys(struct gameport *gameport, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
va_start(args, fmt);
|
|
vsnprintf(gameport->phys, sizeof(gameport->phys), fmt, args);
|
|
va_end(args);
|
|
}
|
|
|
|
/*
|
|
* Prepare gameport port for registration.
|
|
*/
|
|
static void gameport_init_port(struct gameport *gameport)
|
|
{
|
|
static atomic_t gameport_no = ATOMIC_INIT(0);
|
|
|
|
__module_get(THIS_MODULE);
|
|
|
|
init_MUTEX(&gameport->drv_sem);
|
|
device_initialize(&gameport->dev);
|
|
snprintf(gameport->dev.bus_id, sizeof(gameport->dev.bus_id),
|
|
"gameport%lu", (unsigned long)atomic_inc_return(&gameport_no) - 1);
|
|
gameport->dev.bus = &gameport_bus;
|
|
gameport->dev.release = gameport_release_port;
|
|
if (gameport->parent)
|
|
gameport->dev.parent = &gameport->parent->dev;
|
|
|
|
spin_lock_init(&gameport->timer_lock);
|
|
init_timer(&gameport->poll_timer);
|
|
gameport->poll_timer.function = gameport_run_poll_handler;
|
|
gameport->poll_timer.data = (unsigned long)gameport;
|
|
}
|
|
|
|
/*
|
|
* Complete gameport port registration.
|
|
* Driver core will attempt to find appropriate driver for the port.
|
|
*/
|
|
static void gameport_add_port(struct gameport *gameport)
|
|
{
|
|
if (gameport->parent)
|
|
gameport->parent->child = gameport;
|
|
|
|
gameport->speed = gameport_measure_speed(gameport);
|
|
|
|
list_add_tail(&gameport->node, &gameport_list);
|
|
|
|
if (gameport->io)
|
|
printk(KERN_INFO "gameport: %s is %s, io %#x, speed %dkHz\n",
|
|
gameport->name, gameport->phys, gameport->io, gameport->speed);
|
|
else
|
|
printk(KERN_INFO "gameport: %s is %s, speed %dkHz\n",
|
|
gameport->name, gameport->phys, gameport->speed);
|
|
|
|
device_add(&gameport->dev);
|
|
gameport->registered = 1;
|
|
}
|
|
|
|
/*
|
|
* gameport_destroy_port() completes deregistration process and removes
|
|
* port from the system
|
|
*/
|
|
static void gameport_destroy_port(struct gameport *gameport)
|
|
{
|
|
struct gameport *child;
|
|
|
|
child = gameport_get_pending_child(gameport);
|
|
if (child) {
|
|
gameport_remove_pending_events(child);
|
|
put_device(&child->dev);
|
|
}
|
|
|
|
if (gameport->parent) {
|
|
gameport->parent->child = NULL;
|
|
gameport->parent = NULL;
|
|
}
|
|
|
|
if (gameport->registered) {
|
|
device_del(&gameport->dev);
|
|
list_del_init(&gameport->node);
|
|
gameport->registered = 0;
|
|
}
|
|
|
|
gameport_remove_pending_events(gameport);
|
|
put_device(&gameport->dev);
|
|
}
|
|
|
|
/*
|
|
* Reconnect gameport port and all its children (re-initialize attached devices)
|
|
*/
|
|
static void gameport_reconnect_port(struct gameport *gameport)
|
|
{
|
|
do {
|
|
if (!gameport->drv || !gameport->drv->reconnect || gameport->drv->reconnect(gameport)) {
|
|
gameport_disconnect_port(gameport);
|
|
gameport_find_driver(gameport);
|
|
/* Ok, old children are now gone, we are done */
|
|
break;
|
|
}
|
|
gameport = gameport->child;
|
|
} 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;
|
|
|
|
gameport_release_driver(s);
|
|
gameport_destroy_port(s);
|
|
} while ((s = parent) != gameport);
|
|
}
|
|
|
|
/*
|
|
* Ok, no children left, now disconnect this port
|
|
*/
|
|
gameport_release_driver(gameport);
|
|
}
|
|
|
|
void gameport_rescan(struct gameport *gameport)
|
|
{
|
|
gameport_queue_event(gameport, NULL, GAMEPORT_RESCAN);
|
|
}
|
|
|
|
void gameport_reconnect(struct gameport *gameport)
|
|
{
|
|
gameport_queue_event(gameport, NULL, GAMEPORT_RECONNECT);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
/*
|
|
* Synchronously unregisters gameport port.
|
|
*/
|
|
void gameport_unregister_port(struct gameport *gameport)
|
|
{
|
|
down(&gameport_sem);
|
|
gameport_disconnect_port(gameport);
|
|
gameport_destroy_port(gameport);
|
|
up(&gameport_sem);
|
|
}
|
|
|
|
|
|
/*
|
|
* Gameport driver operations
|
|
*/
|
|
|
|
static ssize_t gameport_driver_show_description(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 struct driver_attribute gameport_driver_attrs[] = {
|
|
__ATTR(description, S_IRUGO, gameport_driver_show_description, NULL),
|
|
__ATTR_NULL
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
void __gameport_register_driver(struct gameport_driver *drv, struct module *owner)
|
|
{
|
|
drv->driver.bus = &gameport_bus;
|
|
drv->driver.probe = gameport_driver_probe;
|
|
drv->driver.remove = gameport_driver_remove;
|
|
gameport_queue_event(drv, owner, GAMEPORT_REGISTER_DRIVER);
|
|
}
|
|
|
|
void gameport_unregister_driver(struct gameport_driver *drv)
|
|
{
|
|
struct gameport *gameport;
|
|
|
|
down(&gameport_sem);
|
|
drv->ignore = 1; /* so gameport_find_driver ignores it */
|
|
|
|
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);
|
|
up(&gameport_sem);
|
|
}
|
|
|
|
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 void gameport_set_drv(struct gameport *gameport, struct gameport_driver *drv)
|
|
{
|
|
down(&gameport->drv_sem);
|
|
gameport->drv = drv;
|
|
up(&gameport->drv_sem);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static int __init gameport_init(void)
|
|
{
|
|
if (!(gameport_pid = kernel_thread(gameport_thread, NULL, CLONE_KERNEL))) {
|
|
printk(KERN_ERR "gameport: Failed to start kgameportd\n");
|
|
return -1;
|
|
}
|
|
|
|
gameport_bus.dev_attrs = gameport_device_attrs;
|
|
gameport_bus.drv_attrs = gameport_driver_attrs;
|
|
gameport_bus.match = gameport_bus_match;
|
|
bus_register(&gameport_bus);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit gameport_exit(void)
|
|
{
|
|
bus_unregister(&gameport_bus);
|
|
kill_proc(gameport_pid, SIGTERM, 1);
|
|
wait_for_completion(&gameport_exited);
|
|
}
|
|
|
|
module_init(gameport_init);
|
|
module_exit(gameport_exit);
|