* Generic gameport layer
*
* Copyright (c) 1999-2002 Vojtech Pavlik
+ * Copyright (c) 2005 Dmitry Torokhov
*/
/*
* the Free Software Foundation.
*/
-#include <asm/io.h>
+#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/stddef.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_register_port);
EXPORT_SYMBOL(gameport_unregister_port);
-EXPORT_SYMBOL(gameport_register_device);
-EXPORT_SYMBOL(gameport_unregister_device);
+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 LIST_HEAD(gameport_dev_list);
-#ifdef __i386__
+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)
#endif
+
+
/*
* gameport_measure_speed() measures the gameport i/o speed.
*/
static int gameport_measure_speed(struct gameport *gameport)
{
-#ifdef __i386__
+#if defined(__i386__)
unsigned int i, t, t1, t2, t3, tx;
unsigned long flags;
for(i = 0; i < 50; i++) {
local_irq_save(flags);
GET_TIME(t1);
- for(t = 0; t < 50; t++) gameport_read(gameport);
+ for (t = 0; t < 50; t++) gameport_read(gameport);
GET_TIME(t2);
GET_TIME(t3);
local_irq_restore(flags);
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[_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); }
#endif
}
-static void gameport_find_dev(struct gameport *gameport)
+void gameport_start_polling(struct gameport *gameport)
{
- struct gameport_dev *dev;
+ spin_lock(&gameport->timer_lock);
- list_for_each_entry(dev, &gameport_dev_list, node) {
- if (gameport->dev)
+ 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 (dev->connect)
- dev->connect(gameport, dev);
- }
+ }
+ }
+
+ 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);
}
-void gameport_rescan(struct gameport *gameport)
+static void gameport_free_event(struct gameport_event *event)
{
- gameport_close(gameport);
- gameport_find_dev(gameport);
+ module_put(event->owner);
+ kfree(event);
}
-void gameport_register_port(struct gameport *gameport)
+static void gameport_remove_duplicate_events(struct gameport_event *event)
{
- list_add_tail(&gameport->node, &gameport_list);
+ 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, 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, 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);
- gameport_find_dev(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)
{
- list_del_init(&gameport->node);
- if (gameport->dev && gameport->dev->disconnect)
- gameport->dev->disconnect(gameport);
+ down(&gameport_sem);
+ gameport_disconnect_port(gameport);
+ gameport_destroy_port(gameport);
+ up(&gameport_sem);
}
-void gameport_register_device(struct gameport_dev *dev)
+
+/*
+ * Gameport driver operations
+ */
+
+static ssize_t gameport_driver_show_description(struct device_driver *drv, char *buf)
{
- struct gameport *gameport;
+ 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);
- list_add_tail(&dev->node, &gameport_dev_list);
- list_for_each_entry(gameport, &gameport_list, node)
- if (!gameport->dev && dev->connect)
- dev->connect(gameport, dev);
+ drv->connect(gameport, drv);
+ return gameport->drv ? 0 : -ENODEV;
}
-void gameport_unregister_device(struct gameport_dev *dev)
+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;
- list_del_init(&dev->node);
+ down(&gameport_sem);
+ drv->ignore = 1; /* so gameport_find_driver ignores it */
+
+start_over:
list_for_each_entry(gameport, &gameport_list, node) {
- if (gameport->dev == dev && dev->disconnect)
- dev->disconnect(gameport);
- gameport_find_dev(gameport);
+ 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);
}
-int gameport_open(struct gameport *gameport, struct gameport_dev *dev, int mode)
+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))
+ if (gameport->open(gameport, mode)) {
return -1;
+ }
} else {
if (mode != GAMEPORT_MODE_RAW)
return -1;
}
- if (gameport->dev)
- return -1;
-
- gameport->dev = dev;
-
+ gameport_set_drv(gameport, drv);
return 0;
}
void gameport_close(struct gameport *gameport)
{
- gameport->dev = NULL;
+ 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);
git://git.onelab.eu / linux-2.6.git / blobdiff