Input: introduce input_inject_event() function

Create input_inject_event() function which is to be used by input
handlers as opposed to input_event() which is reserved for drivers
implementing input devices. The difference is that if device is
"grabbed" by some process input_inject_event() will ignore events
unless sent from the handle that is currently owns the device.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

2 files changed, 30 insertions, 3 deletions

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 2426a5d8537d..4bf48188cc91 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -256,7 +256,7 @@ static ssize_t evdev_write(struct file * file, const char __user * buffer, size_
 
                 if (evdev_event_from_user(buffer + retval, &event))
                         return -EFAULT;
-                input_event(list->evdev->handle.dev, event.type, event.code, event.value);
+                input_inject_event(&list->evdev->handle, event.type, event.code, event.value);
                 retval += evdev_event_size();
         }
 
@@ -424,8 +424,8 @@ static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
                         if (get_user(v, ip + 1))
                                 return -EFAULT;
 
-                        input_event(dev, EV_REP, REP_DELAY, u);
-                        input_event(dev, EV_REP, REP_PERIOD, v);
+                        input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
+                        input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
 
                         return 0;
 
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 7aeebb9071c2..e20913942927 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -35,6 +35,16 @@ static LIST_HEAD(input_handler_list);
 
 static struct input_handler *input_table[8];
 
+/**
+ * input_event() - report new input event
+ * @handle: device that generated the event
+ * @type: type of the event
+ * @code: event code
+ * @value: value of the event
+ *
+ * This function should be used by drivers implementing various input devices
+ * See also input_inject_event()
+ */
 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
 {
         struct input_handle *handle;
@@ -183,6 +193,23 @@ void input_event(struct input_dev *dev, unsigned int type, unsigned int code, in
 }
 EXPORT_SYMBOL(input_event);
 
+/**
+ * input_inject_event() - send input event from input handler
+ * @handle: input handle to send event through
+ * @type: type of the event
+ * @code: event code
+ * @value: value of the event
+ *
+ * Similar to input_event() but will ignore event if device is "grabbed" and handle
+ * injecting event is not the one that owns the device.
+ */
+void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
+{
+        if (!handle->dev->grab || handle->dev->grab == handle)
+                input_event(handle->dev, type, code, value);
+}
+EXPORT_SYMBOL(input_inject_event);
+
 static void input_repeat_key(unsigned long data)
 {
         struct input_dev *dev = (void *) data;