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path: root/drivers/input/gameport/gameport.c
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Diffstat (limited to 'drivers/input/gameport/gameport.c')
-rw-r--r--drivers/input/gameport/gameport.c88
1 files changed, 67 insertions, 21 deletions
diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index 078e4ee..2880eaa 100644
--- a/drivers/input/gameport/gameport.c
+++ b/drivers/input/gameport/gameport.c
@@ -231,6 +231,7 @@ static void gameport_find_driver(struct gameport *gameport)
enum gameport_event_type {
GAMEPORT_REGISTER_PORT,
GAMEPORT_REGISTER_DRIVER,
+ GAMEPORT_ATTACH_DRIVER,
};
struct gameport_event {
@@ -245,11 +246,12 @@ static LIST_HEAD(gameport_event_list);
static DECLARE_WAIT_QUEUE_HEAD(gameport_wait);
static struct task_struct *gameport_task;
-static void gameport_queue_event(void *object, struct module *owner,
- enum gameport_event_type event_type)
+static int gameport_queue_event(void *object, struct module *owner,
+ enum gameport_event_type event_type)
{
unsigned long flags;
struct gameport_event *event;
+ int retval = 0;
spin_lock_irqsave(&gameport_event_lock, flags);
@@ -268,24 +270,34 @@ static void gameport_queue_event(void *object, struct module *owner,
}
}
- 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);
- kfree(event);
- goto out;
- }
-
- event->type = event_type;
- event->object = object;
- event->owner = owner;
+ event = kmalloc(sizeof(struct gameport_event), GFP_ATOMIC);
+ if (!event) {
+ printk(KERN_ERR
+ "gameport: Not enough memory to queue event %d\n",
+ event_type);
+ retval = -ENOMEM;
+ goto out;
+ }
- 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);
+ if (!try_module_get(owner)) {
+ printk(KERN_WARNING
+ "gameport: Can't get module reference, dropping event %d\n",
+ event_type);
+ kfree(event);
+ retval = -EINVAL;
+ goto out;
}
+
+ event->type = event_type;
+ event->object = object;
+ event->owner = owner;
+
+ list_add_tail(&event->node, &gameport_event_list);
+ wake_up(&gameport_wait);
+
out:
spin_unlock_irqrestore(&gameport_event_lock, flags);
+ return retval;
}
static void gameport_free_event(struct gameport_event *event)
@@ -378,9 +390,10 @@ static void gameport_handle_event(void)
}
/*
- * Remove all events that have been submitted for a given gameport port.
+ * Remove all events that have been submitted for a given object,
+ * be it a gameport port or a driver.
*/
-static void gameport_remove_pending_events(struct gameport *gameport)
+static void gameport_remove_pending_events(void *object)
{
struct list_head *node, *next;
struct gameport_event *event;
@@ -390,7 +403,7 @@ static void gameport_remove_pending_events(struct gameport *gameport)
list_for_each_safe(node, next, &gameport_event_list) {
event = list_entry(node, struct gameport_event, node);
- if (event->object == gameport) {
+ if (event->object == object) {
list_del_init(node);
gameport_free_event(event);
}
@@ -705,10 +718,40 @@ static void gameport_add_driver(struct gameport_driver *drv)
drv->driver.name, error);
}
-void __gameport_register_driver(struct gameport_driver *drv, struct module *owner)
+int __gameport_register_driver(struct gameport_driver *drv, struct module *owner,
+ const char *mod_name)
{
+ int error;
+
drv->driver.bus = &gameport_bus;
- gameport_queue_event(drv, owner, GAMEPORT_REGISTER_DRIVER);
+ 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 = 1;
+
+ error = driver_register(&drv->driver);
+ if (error) {
+ printk(KERN_ERR
+ "gameport: 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 = 0;
+ error = gameport_queue_event(drv, NULL, GAMEPORT_ATTACH_DRIVER);
+ if (error) {
+ driver_unregister(&drv->driver);
+ return error;
+ }
+
+ return 0;
}
void gameport_unregister_driver(struct gameport_driver *drv)
@@ -716,7 +759,9 @@ void gameport_unregister_driver(struct gameport_driver *drv)
struct gameport *gameport;
mutex_lock(&gameport_mutex);
+
drv->ignore = 1; /* so gameport_find_driver ignores it */
+ gameport_remove_pending_events(drv);
start_over:
list_for_each_entry(gameport, &gameport_list, node) {
@@ -729,6 +774,7 @@ start_over:
}
driver_unregister(&drv->driver);
+
mutex_unlock(&gameport_mutex);
}
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