Linux Kernel input设备之handler

/**

 * struct input_handler - implements one of interfaces for input devices * @private: driver-specific data * @event: event handler. This method is being called by input core with *interrupts disabled and dev->event_lock spinlock held and so *it may not sleep * @events: event sequence handler. This method is being called by *input core with interrupts disabled and dev->event_lock *spinlock held and so it may not sleep * @filter: similar to @event; separates normal event handlers from *"filters". * @match: called after comparing device's id with handler's id_table *to perform fine-grained matching between device and 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 * @legacy_minors: set to %true by drivers using legacy minor ranges * @minor: beginning of range of 32 legacy 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 * @h_list: list of input handles associated with the handler * @node: for placing the driver onto input_handler_list * * Input handlers attach to input devices and create input handles. There * are likely several handlers attached to any given input device at the * same time. All of them will get their copy of input event generated by * the device. * * The very same structure is used to implement input filters. Input core * allows filters to run first and will not pass event to regular handlers * if any of the filters indicate that the event should be filtered (by * returning %true from their filter() method). * * Note that input core serializes calls to connect() and disconnect() * methods. */struct input_handler {void *private;void (*event)(struct input_handle *handle, unsigned int type, unsigned int code, int value);void (*events)(struct input_handle *handle,       const struct input_value *vals, unsigned int count);bool (*filter)(struct input_handle *handle, unsigned int type, unsigned int code, int value);bool (*match)(struct input_handler *handler, struct input_dev *dev);int (*connect)(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);void (*disconnect)(struct input_handle *handle);void (*start)(struct input_handle *handle);bool legacy_minors;int minor;const char *name;const struct input_device_id *id_table;struct list_headh_list;struct list_headnode;};

/**

 * struct input_handle - links input device with an input handler * @private: handler-specific data * @open: counter showing whether the handle is 'open', i.e. should deliver *events from its device * @name: name given to the handle by handler that created it * @dev: input device the handle is attached to * @handler: handler that works with the device through this handle * @d_node: used to put the handle on device's list of attached handles * @h_node: used to put the handle on handler's list of handles from which *it gets events */struct input_handle {void *private;int open;const char *name;struct input_dev *dev;struct input_handler *handler;struct list_headd_node;struct list_headh_node;};