1STRUCT INPUT_HANDLER(9)         Input Subsystem        STRUCT INPUT_HANDLER(9)
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NAME

6       struct_input_handler - implements one of interfaces for input devices
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SYNOPSIS

9       struct input_handler {
10         void * private;
11         void (* event) (struct input_handle *handle, unsigned int type, unsigned int code, int value);
12         bool (* filter) (struct input_handle *handle, unsigned int type, unsigned int code, int value);
13         bool (* match) (struct input_handler *handler, struct input_dev *dev);
14         int (* connect) (struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);
15         void (* disconnect) (struct input_handle *handle);
16         void (* start) (struct input_handle *handle);
17         const struct file_operations * fops;
18         int minor;
19         const char * name;
20         const struct input_device_id * id_table;
21         struct list_head h_list;
22         struct list_head node;
23       };
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MEMBERS

26       private
27           driver-specific data
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29       event
30           event handler. This method is being called by input core with
31           interrupts disabled and dev->event_lock spinlock held and so it may
32           not sleep
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34       filter
35           similar to event; separates normal event handlers from “filters”.
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37       match
38           called after comparing device's id with handler's id_table to
39           perform fine-grained matching between device and handler
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41       connect
42           called when attaching a handler to an input device
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44       disconnect
45           disconnects a handler from input device
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47       start
48           starts handler for given handle. This function is called by input
49           core right after connect method and also when a process that
50           “grabbed” a device releases it
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52       fops
53           file operations this driver implements
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55       minor
56           beginning of range of 32 minors for devices this driver can provide
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58       name
59           name of the handler, to be shown in /proc/bus/input/handlers
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61       id_table
62           pointer to a table of input_device_ids this driver can handle
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64       h_list
65           list of input handles associated with the handler
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67       node
68           for placing the driver onto input_handler_list
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DESCRIPTION

71       Input handlers attach to input devices and create input handles. There
72       are likely several handlers attached to any given input device at the
73       same time. All of them will get their copy of input event generated by
74       the device.
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76       The very same structure is used to implement input filters. Input core
77       allows filters to run first and will not pass event to regular handlers
78       if any of the filters indicate that the event should be filtered (by
79       returning true from their filter method).
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81       Note that input core serializes calls to connect and disconnect
82       methods.
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85Kernel Hackers Manual 2.6.       November 2011         STRUCT INPUT_HANDLER(9)
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