STRUCT INPUT_POLLED_(9) Input Subsystem STRUCT INPUT_POLLED_(9)NAME
struct_input_polled_dev - simple polled input device
SYNOPSIS
struct input_polled_dev {
void * private;
void (* open) (struct input_polled_dev *dev);
void (* close) (struct input_polled_dev *dev);
void (* poll) (struct input_polled_dev *dev);
unsigned int poll_interval;
unsigned int poll_interval_max;
unsigned int poll_interval_min;
struct input_dev * input;
};
MEMBERS
private
private driver data.
open
driver-supplied method that prepares device for polling (enabled the device and maybe flushes device state).
close
driver-supplied method that is called when device is no longer being polled. Used to put device into low power mode.
poll
driver-supplied method that polls the device and posts input events (mandatory).
poll_interval
specifies how often the poll method should be called. Defaults to 500 msec unless overriden when registering the device.
poll_interval_max
specifies upper bound for the poll interval. Defaults to the initial value of poll_interval.
poll_interval_min
specifies lower bound for the poll interval. Defaults to 0.
input
input device structire associated with the polled device. Must be properly initialized by the driver (id, name, phys, bits).
DESCRIPTION
Polled input device provides a skeleton for supporting simple input devices that do not raise interrupts but have to be periodically
scanned or polled to detect changes in their state.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 STRUCT INPUT_POLLED_(9)
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STRUCT INPUT_HANDLER(9) Input Subsystem STRUCT INPUT_HANDLER(9)NAME
struct_input_handler - implements one of interfaces for input devices
SYNOPSIS
struct input_handler {
void * private;
void (* event) (struct input_handle *handle, unsigned int type, unsigned int code, int value);
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);
const struct file_operations * fops;
int minor;
const char * name;
const struct input_device_id * id_table;
struct list_head h_list;
struct list_head node;
};
MEMBERS
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
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
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
h_list
list of input handles associated with the handler
node
for placing the driver onto input_handler_list
DESCRIPTION
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.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 STRUCT INPUT_HANDLER(9)