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Input: uinput - use completions instead of events and manual

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wakeups in force feedback code.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2005-06-30 00:48:14 -05:00
parent 152c12f568
commit 0048e6030d
2 changed files with 47 additions and 43 deletions
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85
drivers/input/misc/uinput.c
View File

@ -53,24 +53,23 @@ static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned i
return 0;
}
static int uinput_request_alloc_id(struct input_dev *dev, struct uinput_request *request)
static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request)
{
/* Atomically allocate an ID for the given request. Returns 0 on success. */
struct uinput_device *udev = dev->private;
int id;
int err = -1;
down(&udev->requests_sem);
spin_lock(&udev->requests_lock);
for (id = 0; id < UINPUT_NUM_REQUESTS; id++)
if (!udev->requests[id]) {
udev->requests[id] = request;
request->id = id;
udev->requests[id] = request;
err = 0;
break;
}
up(&udev->requests_sem);
spin_unlock(&udev->requests_lock);
return err;
}
@ -79,70 +78,78 @@ static struct uinput_request* uinput_request_find(struct uinput_device *udev, in
/* Find an input request, by ID. Returns NULL if the ID isn't valid. */
if (id >= UINPUT_NUM_REQUESTS || id < 0)
return NULL;
if (udev->requests[id]->completed)
return NULL;
return udev->requests[id];
}
static void uinput_request_init(struct input_dev *dev, struct uinput_request *request, int code)
static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
{
struct uinput_device *udev = dev->private;
memset(request, 0, sizeof(struct uinput_request));
request->code = code;
init_waitqueue_head(&request->waitq);
/* Allocate an ID. If none are available right away, wait. */
request->retval = wait_event_interruptible(udev->requests_waitq,
!uinput_request_alloc_id(dev, request));
/* Allocate slot. If none are available right away, wait. */
return wait_event_interruptible(udev->requests_waitq,
!uinput_request_alloc_id(udev, request));
}
static void uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
{
complete(&request->done);
/* Mark slot as available */
udev->requests[request->id] = NULL;
wake_up_interruptible(&udev->requests_waitq);
}
static int uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
{
struct uinput_device *udev = dev->private;
int retval;
/* Tell our userspace app about this new request by queueing an input event */
uinput_dev_event(dev, EV_UINPUT, request->code, request->id);
/* Wait for the request to complete */
retval = wait_event_interruptible(request->waitq, request->completed);
if (retval)
request->retval = retval;
retval = wait_for_completion_interruptible(&request->done);
if (!retval)
retval = request->retval;
/* Release this request's ID, let others know it's available */
udev->requests[request->id] = NULL;
wake_up_interruptible(&udev->requests_waitq);
return retval;
}
static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect)
{
struct uinput_request request;
int retval;
if (!test_bit(EV_FF, dev->evbit))
return -ENOSYS;
uinput_request_init(dev, &request, UI_FF_UPLOAD);
if (request.retval)
return request.retval;
request.id = -1;
init_completion(&request.done);
request.code = UI_FF_UPLOAD;
request.u.effect = effect;
uinput_request_submit(dev, &request);
return request.retval;
retval = uinput_request_reserve_slot(dev->private, &request);
if (!retval)
retval = uinput_request_submit(dev, &request);
return retval;
}
static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
{
struct uinput_request request;
int retval;
if (!test_bit(EV_FF, dev->evbit))
return -ENOSYS;
uinput_request_init(dev, &request, UI_FF_ERASE);
if (request.retval)
return request.retval;
request.id = -1;
init_completion(&request.done);
request.code = UI_FF_ERASE;
request.u.effect_id = effect_id;
uinput_request_submit(dev, &request);
return request.retval;
retval = uinput_request_reserve_slot(dev->private, &request);
if (!retval)
retval = uinput_request_submit(dev, &request);
return retval;
}
static int uinput_create_device(struct uinput_device *udev)
@ -189,7 +196,7 @@ static int uinput_open(struct inode *inode, struct file *file)
if (!newdev)
goto error;
memset(newdev, 0, sizeof(struct uinput_device));
init_MUTEX(&newdev->requests_sem);
spin_lock_init(&newdev->requests_lock);
init_waitqueue_head(&newdev->requests_waitq);
newinput = kmalloc(sizeof(struct input_dev), GFP_KERNEL);
@ -551,8 +558,7 @@ static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd
}
req->retval = ff_up.retval;
memcpy(req->u.effect, &ff_up.effect, sizeof(struct ff_effect));
req->completed = 1;
wake_up_interruptible(&req->waitq);
uinput_request_done(udev, req);
break;
case UI_END_FF_ERASE:
@ -566,8 +572,7 @@ static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd
break;
}
req->retval = ff_erase.retval;
req->completed = 1;
wake_up_interruptible(&req->waitq);
uinput_request_done(udev, req);
break;
default:

5
include/linux/uinput.h
View File

@ -42,8 +42,7 @@ struct uinput_request {
int code; /* UI_FF_UPLOAD, UI_FF_ERASE */
int retval;
wait_queue_head_t waitq;
int completed;
struct completion done;
union {
int effect_id;
@ -62,7 +61,7 @@ struct uinput_device {
struct uinput_request *requests[UINPUT_NUM_REQUESTS];
wait_queue_head_t requests_waitq;
struct semaphore requests_sem;
spinlock_t requests_lock;
};
#endif /* __KERNEL__ */