#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 <linux/kthread.h>
+#include <linux/sched.h> /* HZ */
+#include <linux/mutex.h>
/*#include <asm/io.h>*/
EXPORT_SYMBOL(gameport_stop_polling);
/*
- * gameport_sem protects entire gameport subsystem and is taken
+ * gameport_mutex protects entire gameport subsystem and is taken
* every time gameport port or driver registrered or unregistered.
*/
-static DECLARE_MUTEX(gameport_sem);
+static DEFINE_MUTEX(gameport_mutex);
static LIST_HEAD(gameport_list);
-static struct bus_type gameport_bus = {
- .name = "gameport",
-};
+static struct bus_type gameport_bus;
static void gameport_add_port(struct gameport *gameport);
static void gameport_destroy_port(struct gameport *gameport);
#if defined(__i386__)
+#include <asm/i8253.h>
+
#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;
}
gameport_close(gameport);
- return (cpu_data[_smp_processor_id()].loops_per_jiffy * (unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx);
+ return (cpu_data[raw_smp_processor_id()].loops_per_jiffy * (unsigned long)HZ / (1000 / 50)) / (tx < 1 ? 1 : tx);
#else
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 struct task_struct *gameport_task;
static void gameport_queue_event(void *object, struct module *owner,
enum gameport_event_type event_type)
spin_lock_irqsave(&gameport_event_lock, flags);
/*
- * Scan event list for the other events for the same gameport port,
+ * 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)
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;
}
return event;
}
-static void gameport_handle_events(void)
+static void gameport_handle_event(void)
{
struct gameport_event *event;
struct gameport_driver *gameport_drv;
- down(&gameport_sem);
+ mutex_lock(&gameport_mutex);
- while ((event = gameport_get_event())) {
+ /*
+ * Note that we handle only one event here to give swsusp
+ * a chance to freeze kgameportd thread. Gameport events
+ * should be pretty rare so we are not concerned about
+ * taking performance hit.
+ */
+ if ((event = gameport_get_event())) {
switch (event->type) {
case GAMEPORT_REGISTER_PORT:
gameport_free_event(event);
}
- up(&gameport_sem);
+ mutex_unlock(&gameport_mutex);
}
/*
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));
+ gameport_handle_event();
+ wait_event_interruptible(gameport_wait,
+ kthread_should_stop() || !list_empty(&gameport_event_list));
+ try_to_freeze();
+ } while (!kthread_should_stop());
printk(KERN_DEBUG "gameport: kgameportd exiting\n");
-
- unlock_kernel();
- complete_and_exit(&gameport_exited, 0);
+ return 0;
}
* Gameport port operations
*/
-static ssize_t gameport_show_description(struct device *dev, char *buf)
+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, const char *buf, size_t count)
+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);
+ retval = mutex_lock_interruptible(&gameport_mutex);
if (retval)
return retval;
retval = -EINVAL;
}
- up(&gameport_sem);
+ mutex_unlock(&gameport_mutex);
return retval;
}
__module_get(THIS_MODULE);
- init_MUTEX(&gameport->drv_sem);
+ mutex_init(&gameport->drv_mutex);
device_initialize(&gameport->dev);
snprintf(gameport->dev.bus_id, sizeof(gameport->dev.bus_id),
"gameport%lu", (unsigned long)atomic_inc_return(&gameport_no) - 1);
*/
void gameport_unregister_port(struct gameport *gameport)
{
- down(&gameport_sem);
+ mutex_lock(&gameport_mutex);
gameport_disconnect_port(gameport);
gameport_destroy_port(gameport);
- up(&gameport_sem);
+ mutex_unlock(&gameport_mutex);
}
return 0;
}
+static struct bus_type gameport_bus = {
+ .name = "gameport",
+ .probe = gameport_driver_probe,
+ .remove = gameport_driver_remove,
+};
+
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);
}
{
struct gameport *gameport;
- down(&gameport_sem);
+ mutex_lock(&gameport_mutex);
drv->ignore = 1; /* so gameport_find_driver ignores it */
start_over:
}
driver_unregister(&drv->driver);
- up(&gameport_sem);
+ mutex_unlock(&gameport_mutex);
}
static int gameport_bus_match(struct device *dev, struct device_driver *drv)
static void gameport_set_drv(struct gameport *gameport, struct gameport_driver *drv)
{
- down(&gameport->drv_sem);
+ mutex_lock(&gameport->drv_mutex);
gameport->drv = drv;
- up(&gameport->drv_sem);
+ mutex_unlock(&gameport->drv_mutex);
}
int gameport_open(struct gameport *gameport, struct gameport_driver *drv, int mode)
static int __init gameport_init(void)
{
- if (!(gameport_pid = kernel_thread(gameport_thread, NULL, CLONE_KERNEL))) {
+ gameport_task = kthread_run(gameport_thread, NULL, "kgameportd");
+ if (IS_ERR(gameport_task)) {
printk(KERN_ERR "gameport: Failed to start kgameportd\n");
- return -1;
+ return PTR_ERR(gameport_task);
}
gameport_bus.dev_attrs = gameport_device_attrs;
static void __exit gameport_exit(void)
{
bus_unregister(&gameport_bus);
- kill_proc(gameport_pid, SIGTERM, 1);
- wait_for_completion(&gameport_exited);
+ kthread_stop(gameport_task);
}
-module_init(gameport_init);
+subsys_initcall(gameport_init);
module_exit(gameport_exit);
git://git.onelab.eu / linux-2.6.git / blobdiff