Input: add start() method to input handlers

The new start() method is called immediately after connect() and also
when "grabbed" device is released by its owner. This will allow input
handlers to re-synchronize state of once-grabbed device with the rest
of devices.

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

1 files changed, 21 insertions, 0 deletions

diff --git a/include/linux/input.h b/include/linux/input.h
index 6e3afad26fa9..55e628e8805b 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -960,6 +960,26 @@ struct input_dev {
 
 struct input_handle;
 
+/**
+ * struct input_handler - implements one of interfaces for input devices
+ * @private: driver-specific data
+ * @event: event handler
+ * @connect: called when attaching a handler to an input device
+ * @disconnect: disconnects a handler from input device
+ * @start: starts handler for given handle. This function is called by
+ *      input core right after connect() method and also when a process
+ *      that "grabbed" a device releases it
+ * @fops: file operations this driver implements
+ * @minor: beginning of range of 32 minors for devices this driver
+ *      can provide
+ * @name: name of the handler, to be shown in /proc/bus/input/handlers
+ * @id_table: pointer to a table of input_device_ids this driver can
+ *      handle
+ * @blacklist: prointer to a table of input_device_ids this driver should
+ *      ignore even if they match @id_table
+ * @h_list: list of input handles associated with the handler
+ * @node: for placing the driver onto input_handler_list
+ */
 struct input_handler {
 
         void *private;
@@ -967,6 +987,7 @@ struct input_handler {
         void (*event)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
         struct input_handle* (*connect)(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id);
         void (*disconnect)(struct input_handle *handle);
+        void (*start)(struct input_handle *handle);
 
         const struct file_operations *fops;
         int minor;