struct input_dev — represents an input device
struct input_dev {
const char * name;
const char * phys;
const char * uniq;
struct input_id id;
unsigned long propbit[BITS_TO_LONGS(INPUT_PROP_CNT)];
unsigned long evbit[BITS_TO_LONGS(EV_CNT)];
unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];
unsigned long relbit[BITS_TO_LONGS(REL_CNT)];
unsigned long absbit[BITS_TO_LONGS(ABS_CNT)];
unsigned long mscbit[BITS_TO_LONGS(MSC_CNT)];
unsigned long ledbit[BITS_TO_LONGS(LED_CNT)];
unsigned long sndbit[BITS_TO_LONGS(SND_CNT)];
unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
unsigned long swbit[BITS_TO_LONGS(SW_CNT)];
unsigned int hint_events_per_packet;
unsigned int keycodemax;
unsigned int keycodesize;
void * keycode;
int (* setkeycode) (struct input_dev *dev,const struct input_keymap_entry *ke,unsigned int *old_keycode);
int (* getkeycode) (struct input_dev *dev,struct input_keymap_entry *ke);
struct ff_device * ff;
unsigned int repeat_key;
struct timer_list timer;
int rep[REP_CNT];
struct input_mt_slot * mt;
int mtsize;
int slot;
int trkid;
struct input_absinfo * absinfo;
unsigned long key[BITS_TO_LONGS(KEY_CNT)];
unsigned long led[BITS_TO_LONGS(LED_CNT)];
unsigned long snd[BITS_TO_LONGS(SND_CNT)];
unsigned long sw[BITS_TO_LONGS(SW_CNT)];
int (* open) (struct input_dev *dev);
void (* close) (struct input_dev *dev);
int (* flush) (struct input_dev *dev, struct file *file);
int (* event) (struct input_dev *dev, unsigned int type, unsigned int code, int value);
struct input_handle __rcu * grab;
spinlock_t event_lock;
struct mutex mutex;
unsigned int users;
bool going_away;
bool sync;
struct device dev;
struct list_head h_list;
struct list_head node;
}; name of the device
physical path to the device in the system hierarchy
unique identification code for the device (if device has it)
id of the device (struct input_id)
bitmap of device properties and quirks
bitmap of types of events supported by the device (EV_KEY, EV_REL, etc.)
bitmap of keys/buttons this device has
bitmap of relative axes for the device
bitmap of absolute axes for the device
bitmap of miscellaneous events supported by the device
bitmap of leds present on the device
bitmap of sound effects supported by the device
bitmap of force feedback effects supported by the device
bitmap of switches present on the device
average number of events generated by the device in a packet (between EV_SYN/SYN_REPORT events). Used by event handlers to estimate size of the buffer needed to hold events.
size of keycode table
size of elements in keycode table
map of scancodes to keycodes for this device
optional method to alter current keymap, used to implement sparse keymaps. If not supplied default mechanism will be used. The method is being called while holding event_lock and thus must not sleep
optional legacy method to retrieve current keymap.
force feedback structure associated with the device if device supports force feedback effects
stores key code of the last key pressed; used to implement software autorepeat
timer for software autorepeat
current values for autorepeat parameters (delay, rate)
pointer to array of struct input_mt_slot holding current values of tracked contacts
number of MT slots the device uses
MT slot currently being transmitted
stores MT tracking ID for the current contact
array of struct input_absinfo elements holding information about absolute axes (current value, min, max, flat, fuzz, resolution)
reflects current state of device's keys/buttons
reflects current state of device's LEDs
reflects current state of sound effects
reflects current state of device's switches
this method is called when the very first user calls
input_open_device. The driver must prepare the device
to start generating events (start polling thread,
request an IRQ, submit URB, etc.)
this method is called when the very last user calls
input_close_device.
purges the device. Most commonly used to get rid of force feedback effects loaded into the device when disconnecting from it
event handler for events sent _to_ the device, like EV_LED
or EV_SND. The device is expected to carry out the requested
action (turn on a LED, play sound, etc.) The call is protected
by event_lock and must not sleep
input handle that currently has the device grabbed (via EVIOCGRAB ioctl). When a handle grabs a device it becomes sole recipient for all input events coming from the device
this spinlock is is taken when input core receives
and processes a new event for the device (in input_event).
Code that accesses and/or modifies parameters of a device
(such as keymap or absmin, absmax, absfuzz, etc.) after device
has been registered with input core must take this lock.
serializes calls to open, close and flush methods
stores number of users (input handlers) that opened this
device. It is used by input_open_device and input_close_device
to make sure that dev->open is only called when the first
user opens device and dev->close is called when the very
last user closes the device
marks devices that are in a middle of unregistering and causes input_open_device*() fail with -ENODEV.
set to true when there were no new events since last EV_SYN
driver model's view of this device
list of input handles associated with the device. When accessing the list dev->mutex must be held
used to place the device onto input_dev_list