EXPORT_SYMBOL_GPL(input_ff_erase);
/*
- * flush_effects - erase all effects owned by a file handle
+ * input_ff_flush - erase all effects owned by a file handle
+ * @dev: input device to erase effect from
+ * @file: purported owner of the effects
+ *
+ * This function erases all force-feedback effects associated with
+ * the given owner from specified device. Note that @file may be %NULL,
+ * in which case all effects will be erased.
*/
-static int flush_effects(struct input_dev *dev, struct file *file)
+int input_ff_flush(struct input_dev *dev, struct file *file)
{
struct ff_device *ff = dev->ff;
int i;
return 0;
}
+EXPORT_SYMBOL_GPL(input_ff_flush);
/**
* input_ff_event() - generic handler for force-feedback events
* Once ff device is created you need to setup its upload, erase,
* playback and other handlers before registering input device
*/
-int input_ff_create(struct input_dev *dev, int max_effects)
+int input_ff_create(struct input_dev *dev, unsigned int max_effects)
{
struct ff_device *ff;
+ size_t ff_dev_size;
int i;
if (!max_effects) {
return -EINVAL;
}
- ff = kzalloc(sizeof(struct ff_device) +
- max_effects * sizeof(struct file *), GFP_KERNEL);
+ ff_dev_size = sizeof(struct ff_device) +
+ max_effects * sizeof(struct file *);
+ if (ff_dev_size < max_effects) /* overflow */
+ return -EINVAL;
+
+ ff = kzalloc(ff_dev_size, GFP_KERNEL);
if (!ff)
return -ENOMEM;
mutex_init(&ff->mutex);
dev->ff = ff;
- dev->flush = flush_effects;
+ dev->flush = input_ff_flush;
dev->event = input_ff_event;
__set_bit(EV_FF, dev->evbit);