2 * Copyright (c) 1999-2002 Vojtech Pavlik
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 as published by
6 * the Free Software Foundation.
11 #include <linux/time.h>
12 #include <linux/list.h>
13 #include <uapi/linux/input.h>
14 /* Implementation details, userspace should not care about these */
15 #define ABS_MT_FIRST ABS_MT_TOUCH_MAJOR
16 #define ABS_MT_LAST ABS_MT_TOOL_Y
19 * In-kernel definitions.
22 #include <linux/device.h>
24 #include <linux/timer.h>
25 #include <linux/mod_devicetable.h>
28 * struct input_value - input value representation
29 * @type: type of value (EV_KEY, EV_ABS, etc)
30 * @code: the value code
40 * struct input_dev - represents an input device
41 * @name: name of the device
42 * @phys: physical path to the device in the system hierarchy
43 * @uniq: unique identification code for the device (if device has it)
44 * @id: id of the device (struct input_id)
45 * @propbit: bitmap of device properties and quirks
46 * @evbit: bitmap of types of events supported by the device (EV_KEY,
48 * @keybit: bitmap of keys/buttons this device has
49 * @relbit: bitmap of relative axes for the device
50 * @absbit: bitmap of absolute axes for the device
51 * @mscbit: bitmap of miscellaneous events supported by the device
52 * @ledbit: bitmap of leds present on the device
53 * @sndbit: bitmap of sound effects supported by the device
54 * @ffbit: bitmap of force feedback effects supported by the device
55 * @swbit: bitmap of switches present on the device
56 * @hint_events_per_packet: average number of events generated by the
57 * device in a packet (between EV_SYN/SYN_REPORT events). Used by
58 * event handlers to estimate size of the buffer needed to hold
60 * @keycodemax: size of keycode table
61 * @keycodesize: size of elements in keycode table
62 * @keycode: map of scancodes to keycodes for this device
63 * @getkeycode: optional legacy method to retrieve current keymap.
64 * @setkeycode: optional method to alter current keymap, used to implement
65 * sparse keymaps. If not supplied default mechanism will be used.
66 * The method is being called while holding event_lock and thus must
68 * @ff: force feedback structure associated with the device if device
69 * supports force feedback effects
70 * @repeat_key: stores key code of the last key pressed; used to implement
72 * @timer: timer for software autorepeat
73 * @rep: current values for autorepeat parameters (delay, rate)
74 * @mt: pointer to multitouch state
75 * @absinfo: array of &struct input_absinfo elements holding information
76 * about absolute axes (current value, min, max, flat, fuzz,
78 * @key: reflects current state of device's keys/buttons
79 * @led: reflects current state of device's LEDs
80 * @snd: reflects current state of sound effects
81 * @sw: reflects current state of device's switches
82 * @open: this method is called when the very first user calls
83 * input_open_device(). The driver must prepare the device
84 * to start generating events (start polling thread,
85 * request an IRQ, submit URB, etc.)
86 * @close: this method is called when the very last user calls
87 * input_close_device().
88 * @flush: purges the device. Most commonly used to get rid of force
89 * feedback effects loaded into the device when disconnecting
91 * @event: event handler for events sent _to_ the device, like EV_LED
92 * or EV_SND. The device is expected to carry out the requested
93 * action (turn on a LED, play sound, etc.) The call is protected
94 * by @event_lock and must not sleep
95 * @grab: input handle that currently has the device grabbed (via
96 * EVIOCGRAB ioctl). When a handle grabs a device it becomes sole
97 * recipient for all input events coming from the device
98 * @event_lock: this spinlock is is taken when input core receives
99 * and processes a new event for the device (in input_event()).
100 * Code that accesses and/or modifies parameters of a device
101 * (such as keymap or absmin, absmax, absfuzz, etc.) after device
102 * has been registered with input core must take this lock.
103 * @mutex: serializes calls to open(), close() and flush() methods
104 * @users: stores number of users (input handlers) that opened this
105 * device. It is used by input_open_device() and input_close_device()
106 * to make sure that dev->open() is only called when the first
107 * user opens device and dev->close() is called when the very
108 * last user closes the device
109 * @going_away: marks devices that are in a middle of unregistering and
110 * causes input_open_device*() fail with -ENODEV.
111 * @dev: driver model's view of this device
112 * @h_list: list of input handles associated with the device. When
113 * accessing the list dev->mutex must be held
114 * @node: used to place the device onto input_dev_list
122 unsigned long propbit[BITS_TO_LONGS(INPUT_PROP_CNT)];
124 unsigned long evbit[BITS_TO_LONGS(EV_CNT)];
125 unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];
126 unsigned long relbit[BITS_TO_LONGS(REL_CNT)];
127 unsigned long absbit[BITS_TO_LONGS(ABS_CNT)];
128 unsigned long mscbit[BITS_TO_LONGS(MSC_CNT)];
129 unsigned long ledbit[BITS_TO_LONGS(LED_CNT)];
130 unsigned long sndbit[BITS_TO_LONGS(SND_CNT)];
131 unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
132 unsigned long swbit[BITS_TO_LONGS(SW_CNT)];
134 unsigned int hint_events_per_packet;
136 unsigned int keycodemax;
137 unsigned int keycodesize;
140 int (*setkeycode)(struct input_dev *dev,
141 const struct input_keymap_entry *ke,
142 unsigned int *old_keycode);
143 int (*getkeycode)(struct input_dev *dev,
144 struct input_keymap_entry *ke);
146 struct ff_device *ff;
148 unsigned int repeat_key;
149 struct timer_list timer;
155 struct input_absinfo *absinfo;
157 unsigned long key[BITS_TO_LONGS(KEY_CNT)];
158 unsigned long led[BITS_TO_LONGS(LED_CNT)];
159 unsigned long snd[BITS_TO_LONGS(SND_CNT)];
160 unsigned long sw[BITS_TO_LONGS(SW_CNT)];
162 int (*open)(struct input_dev *dev);
163 void (*close)(struct input_dev *dev);
164 int (*flush)(struct input_dev *dev, struct file *file);
165 int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
167 struct input_handle __rcu *grab;
169 spinlock_t event_lock;
177 struct list_head h_list;
178 struct list_head node;
180 unsigned int num_vals;
181 unsigned int max_vals;
182 struct input_value *vals;
184 #define to_input_dev(d) container_of(d, struct input_dev, dev)
187 * Verify that we are in sync with input_device_id mod_devicetable.h #defines
190 #if EV_MAX != INPUT_DEVICE_ID_EV_MAX
191 #error "EV_MAX and INPUT_DEVICE_ID_EV_MAX do not match"
194 #if KEY_MIN_INTERESTING != INPUT_DEVICE_ID_KEY_MIN_INTERESTING
195 #error "KEY_MIN_INTERESTING and INPUT_DEVICE_ID_KEY_MIN_INTERESTING do not match"
198 #if KEY_MAX != INPUT_DEVICE_ID_KEY_MAX
199 #error "KEY_MAX and INPUT_DEVICE_ID_KEY_MAX do not match"
202 #if REL_MAX != INPUT_DEVICE_ID_REL_MAX
203 #error "REL_MAX and INPUT_DEVICE_ID_REL_MAX do not match"
206 #if ABS_MAX != INPUT_DEVICE_ID_ABS_MAX
207 #error "ABS_MAX and INPUT_DEVICE_ID_ABS_MAX do not match"
210 #if MSC_MAX != INPUT_DEVICE_ID_MSC_MAX
211 #error "MSC_MAX and INPUT_DEVICE_ID_MSC_MAX do not match"
214 #if LED_MAX != INPUT_DEVICE_ID_LED_MAX
215 #error "LED_MAX and INPUT_DEVICE_ID_LED_MAX do not match"
218 #if SND_MAX != INPUT_DEVICE_ID_SND_MAX
219 #error "SND_MAX and INPUT_DEVICE_ID_SND_MAX do not match"
222 #if FF_MAX != INPUT_DEVICE_ID_FF_MAX
223 #error "FF_MAX and INPUT_DEVICE_ID_FF_MAX do not match"
226 #if SW_MAX != INPUT_DEVICE_ID_SW_MAX
227 #error "SW_MAX and INPUT_DEVICE_ID_SW_MAX do not match"
230 #define INPUT_DEVICE_ID_MATCH_DEVICE \
231 (INPUT_DEVICE_ID_MATCH_BUS | INPUT_DEVICE_ID_MATCH_VENDOR | INPUT_DEVICE_ID_MATCH_PRODUCT)
232 #define INPUT_DEVICE_ID_MATCH_DEVICE_AND_VERSION \
233 (INPUT_DEVICE_ID_MATCH_DEVICE | INPUT_DEVICE_ID_MATCH_VERSION)
238 * struct input_handler - implements one of interfaces for input devices
239 * @private: driver-specific data
240 * @event: event handler. This method is being called by input core with
241 * interrupts disabled and dev->event_lock spinlock held and so
243 * @events: event sequence handler. This method is being called by
244 * input core with interrupts disabled and dev->event_lock
245 * spinlock held and so it may not sleep
246 * @filter: similar to @event; separates normal event handlers from
248 * @match: called after comparing device's id with handler's id_table
249 * to perform fine-grained matching between device and handler
250 * @connect: called when attaching a handler to an input device
251 * @disconnect: disconnects a handler from input device
252 * @start: starts handler for given handle. This function is called by
253 * input core right after connect() method and also when a process
254 * that "grabbed" a device releases it
255 * @legacy_minors: set to %true by drivers using legacy minor ranges
256 * @minor: beginning of range of 32 legacy minors for devices this driver
258 * @name: name of the handler, to be shown in /proc/bus/input/handlers
259 * @id_table: pointer to a table of input_device_ids this driver can
261 * @h_list: list of input handles associated with the handler
262 * @node: for placing the driver onto input_handler_list
264 * Input handlers attach to input devices and create input handles. There
265 * are likely several handlers attached to any given input device at the
266 * same time. All of them will get their copy of input event generated by
269 * The very same structure is used to implement input filters. Input core
270 * allows filters to run first and will not pass event to regular handlers
271 * if any of the filters indicate that the event should be filtered (by
272 * returning %true from their filter() method).
274 * Note that input core serializes calls to connect() and disconnect()
277 struct input_handler {
281 void (*event)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
282 void (*events)(struct input_handle *handle,
283 const struct input_value *vals, unsigned int count);
284 bool (*filter)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
285 bool (*match)(struct input_handler *handler, struct input_dev *dev);
286 int (*connect)(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);
287 void (*disconnect)(struct input_handle *handle);
288 void (*start)(struct input_handle *handle);
294 const struct input_device_id *id_table;
296 struct list_head h_list;
297 struct list_head node;
301 * struct input_handle - links input device with an input handler
302 * @private: handler-specific data
303 * @open: counter showing whether the handle is 'open', i.e. should deliver
304 * events from its device
305 * @name: name given to the handle by handler that created it
306 * @dev: input device the handle is attached to
307 * @handler: handler that works with the device through this handle
308 * @d_node: used to put the handle on device's list of attached handles
309 * @h_node: used to put the handle on handler's list of handles from which
312 struct input_handle {
319 struct input_dev *dev;
320 struct input_handler *handler;
322 struct list_head d_node;
323 struct list_head h_node;
326 struct input_dev *input_allocate_device(void);
327 void input_free_device(struct input_dev *dev);
329 static inline struct input_dev *input_get_device(struct input_dev *dev)
331 return dev ? to_input_dev(get_device(&dev->dev)) : NULL;
334 static inline void input_put_device(struct input_dev *dev)
337 put_device(&dev->dev);
340 static inline void *input_get_drvdata(struct input_dev *dev)
342 return dev_get_drvdata(&dev->dev);
345 static inline void input_set_drvdata(struct input_dev *dev, void *data)
347 dev_set_drvdata(&dev->dev, data);
350 int __must_check input_register_device(struct input_dev *);
351 void input_unregister_device(struct input_dev *);
353 void input_reset_device(struct input_dev *);
355 int __must_check input_register_handler(struct input_handler *);
356 void input_unregister_handler(struct input_handler *);
358 int __must_check input_get_new_minor(int legacy_base, unsigned int legacy_num,
360 void input_free_minor(unsigned int minor);
362 int input_handler_for_each_handle(struct input_handler *, void *data,
363 int (*fn)(struct input_handle *, void *));
365 int input_register_handle(struct input_handle *);
366 void input_unregister_handle(struct input_handle *);
368 int input_grab_device(struct input_handle *);
369 void input_release_device(struct input_handle *);
371 int input_open_device(struct input_handle *);
372 void input_close_device(struct input_handle *);
374 int input_flush_device(struct input_handle *handle, struct file *file);
376 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
377 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value);
379 static inline void input_report_key(struct input_dev *dev, unsigned int code, int value)
381 input_event(dev, EV_KEY, code, !!value);
384 static inline void input_report_rel(struct input_dev *dev, unsigned int code, int value)
386 input_event(dev, EV_REL, code, value);
389 static inline void input_report_abs(struct input_dev *dev, unsigned int code, int value)
391 input_event(dev, EV_ABS, code, value);
394 static inline void input_report_ff_status(struct input_dev *dev, unsigned int code, int value)
396 input_event(dev, EV_FF_STATUS, code, value);
399 static inline void input_report_switch(struct input_dev *dev, unsigned int code, int value)
401 input_event(dev, EV_SW, code, !!value);
404 static inline void input_sync(struct input_dev *dev)
406 input_event(dev, EV_SYN, SYN_REPORT, 0);
409 static inline void input_mt_sync(struct input_dev *dev)
411 input_event(dev, EV_SYN, SYN_MT_REPORT, 0);
414 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code);
417 * input_set_events_per_packet - tell handlers about the driver event rate
418 * @dev: the input device used by the driver
419 * @n_events: the average number of events between calls to input_sync()
421 * If the event rate sent from a device is unusually large, use this
422 * function to set the expected event rate. This will allow handlers
423 * to set up an appropriate buffer size for the event stream, in order
424 * to minimize information loss.
426 static inline void input_set_events_per_packet(struct input_dev *dev, int n_events)
428 dev->hint_events_per_packet = n_events;
431 void input_alloc_absinfo(struct input_dev *dev);
432 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
433 int min, int max, int fuzz, int flat);
435 #define INPUT_GENERATE_ABS_ACCESSORS(_suffix, _item) \
436 static inline int input_abs_get_##_suffix(struct input_dev *dev, \
439 return dev->absinfo ? dev->absinfo[axis]._item : 0; \
442 static inline void input_abs_set_##_suffix(struct input_dev *dev, \
443 unsigned int axis, int val) \
445 input_alloc_absinfo(dev); \
447 dev->absinfo[axis]._item = val; \
450 INPUT_GENERATE_ABS_ACCESSORS(val, value)
451 INPUT_GENERATE_ABS_ACCESSORS(min, minimum)
452 INPUT_GENERATE_ABS_ACCESSORS(max, maximum)
453 INPUT_GENERATE_ABS_ACCESSORS(fuzz, fuzz)
454 INPUT_GENERATE_ABS_ACCESSORS(flat, flat)
455 INPUT_GENERATE_ABS_ACCESSORS(res, resolution)
457 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
458 unsigned int *scancode);
460 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke);
461 int input_set_keycode(struct input_dev *dev,
462 const struct input_keymap_entry *ke);
464 extern struct class input_class;
467 * struct ff_device - force-feedback part of an input device
468 * @upload: Called to upload an new effect into device
469 * @erase: Called to erase an effect from device
470 * @playback: Called to request device to start playing specified effect
471 * @set_gain: Called to set specified gain
472 * @set_autocenter: Called to auto-center device
473 * @destroy: called by input core when parent input device is being
475 * @private: driver-specific data, will be freed automatically
476 * @ffbit: bitmap of force feedback capabilities truly supported by
477 * device (not emulated like ones in input_dev->ffbit)
478 * @mutex: mutex for serializing access to the device
479 * @max_effects: maximum number of effects supported by device
480 * @effects: pointer to an array of effects currently loaded into device
481 * @effect_owners: array of effect owners; when file handle owning
482 * an effect gets closed the effect is automatically erased
484 * Every force-feedback device must implement upload() and playback()
485 * methods; erase() is optional. set_gain() and set_autocenter() need
486 * only be implemented if driver sets up FF_GAIN and FF_AUTOCENTER
489 * Note that playback(), set_gain() and set_autocenter() are called with
490 * dev->event_lock spinlock held and interrupts off and thus may not
494 int (*upload)(struct input_dev *dev, struct ff_effect *effect,
495 struct ff_effect *old);
496 int (*erase)(struct input_dev *dev, int effect_id);
498 int (*playback)(struct input_dev *dev, int effect_id, int value);
499 void (*set_gain)(struct input_dev *dev, u16 gain);
500 void (*set_autocenter)(struct input_dev *dev, u16 magnitude);
502 void (*destroy)(struct ff_device *);
506 unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
511 struct ff_effect *effects;
512 struct file *effect_owners[];
515 int input_ff_create(struct input_dev *dev, unsigned int max_effects);
516 void input_ff_destroy(struct input_dev *dev);
518 int input_ff_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
520 int input_ff_upload(struct input_dev *dev, struct ff_effect *effect, struct file *file);
521 int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file);
523 int input_ff_create_memless(struct input_dev *dev, void *data,
524 int (*play_effect)(struct input_dev *, void *, struct ff_effect *));