1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (c) 1999-2002 Vojtech Pavlik
4 */
5 #ifndef _INPUT_H
6 #define _INPUT_H
7
8 #include <linux/time.h>
9 #include <linux/list.h>
10 #include <uapi/linux/input.h>
11 /* Implementation details, userspace should not care about these */
12 #define ABS_MT_FIRST ABS_MT_TOUCH_MAJOR
13 #define ABS_MT_LAST ABS_MT_TOOL_Y
14
15 /*
16 * In-kernel definitions.
17 */
18
19 #include <linux/device.h>
20 #include <linux/fs.h>
21 #include <linux/timer.h>
22 #include <linux/mod_devicetable.h>
23
24 struct input_dev_poller;
25
26 /**
27 * struct input_value - input value representation
28 * @type: type of value (EV_KEY, EV_ABS, etc)
29 * @code: the value code
30 * @value: the value
31 */
32 struct input_value {
33 __u16 type;
34 __u16 code;
35 __s32 value;
36 };
37
38 enum input_clock_type {
39 INPUT_CLK_REAL = 0,
40 INPUT_CLK_MONO,
41 INPUT_CLK_BOOT,
42 INPUT_CLK_MAX
43 };
44
45 /**
46 * struct input_dev - represents an input device
47 * @name: name of the device
48 * @phys: physical path to the device in the system hierarchy
49 * @uniq: unique identification code for the device (if device has it)
50 * @id: id of the device (struct input_id)
51 * @propbit: bitmap of device properties and quirks
52 * @evbit: bitmap of types of events supported by the device (EV_KEY,
53 * EV_REL, etc.)
54 * @keybit: bitmap of keys/buttons this device has
55 * @relbit: bitmap of relative axes for the device
56 * @absbit: bitmap of absolute axes for the device
57 * @mscbit: bitmap of miscellaneous events supported by the device
58 * @ledbit: bitmap of leds present on the device
59 * @sndbit: bitmap of sound effects supported by the device
60 * @ffbit: bitmap of force feedback effects supported by the device
61 * @swbit: bitmap of switches present on the device
62 * @hint_events_per_packet: average number of events generated by the
63 * device in a packet (between EV_SYN/SYN_REPORT events). Used by
64 * event handlers to estimate size of the buffer needed to hold
65 * events.
66 * @keycodemax: size of keycode table
67 * @keycodesize: size of elements in keycode table
68 * @keycode: map of scancodes to keycodes for this device
69 * @getkeycode: optional legacy method to retrieve current keymap.
70 * @setkeycode: optional method to alter current keymap, used to implement
71 * sparse keymaps. If not supplied default mechanism will be used.
72 * The method is being called while holding event_lock and thus must
73 * not sleep
74 * @ff: force feedback structure associated with the device if device
75 * supports force feedback effects
76 * @poller: poller structure associated with the device if device is
77 * set up to use polling mode
78 * @repeat_key: stores key code of the last key pressed; used to implement
79 * software autorepeat
80 * @timer: timer for software autorepeat
81 * @rep: current values for autorepeat parameters (delay, rate)
82 * @mt: pointer to multitouch state
83 * @absinfo: array of &struct input_absinfo elements holding information
84 * about absolute axes (current value, min, max, flat, fuzz,
85 * resolution)
86 * @key: reflects current state of device's keys/buttons
87 * @led: reflects current state of device's LEDs
88 * @snd: reflects current state of sound effects
89 * @sw: reflects current state of device's switches
90 * @open: this method is called when the very first user calls
91 * input_open_device(). The driver must prepare the device
92 * to start generating events (start polling thread,
93 * request an IRQ, submit URB, etc.). The meaning of open() is
94 * to start providing events to the input core.
95 * @close: this method is called when the very last user calls
96 * input_close_device(). The meaning of close() is to stop
97 * providing events to the input core.
98 * @flush: purges the device. Most commonly used to get rid of force
99 * feedback effects loaded into the device when disconnecting
100 * from it
101 * @event: event handler for events sent _to_ the device, like EV_LED
102 * or EV_SND. The device is expected to carry out the requested
103 * action (turn on a LED, play sound, etc.) The call is protected
104 * by @event_lock and must not sleep
105 * @grab: input handle that currently has the device grabbed (via
106 * EVIOCGRAB ioctl). When a handle grabs a device it becomes sole
107 * recipient for all input events coming from the device
108 * @event_lock: this spinlock is taken when input core receives
109 * and processes a new event for the device (in input_event()).
110 * Code that accesses and/or modifies parameters of a device
111 * (such as keymap or absmin, absmax, absfuzz, etc.) after device
112 * has been registered with input core must take this lock.
113 * @mutex: serializes calls to open(), close() and flush() methods
114 * @users: stores number of users (input handlers) that opened this
115 * device. It is used by input_open_device() and input_close_device()
116 * to make sure that dev->open() is only called when the first
117 * user opens device and dev->close() is called when the very
118 * last user closes the device
119 * @going_away: marks devices that are in a middle of unregistering and
120 * causes input_open_device*() fail with -ENODEV.
121 * @dev: driver model's view of this device
122 * @h_list: list of input handles associated with the device. When
123 * accessing the list dev->mutex must be held
124 * @node: used to place the device onto input_dev_list
125 * @num_vals: number of values queued in the current frame
126 * @max_vals: maximum number of values queued in a frame
127 * @vals: array of values queued in the current frame
128 * @devres_managed: indicates that devices is managed with devres framework
129 * and needs not be explicitly unregistered or freed.
130 * @timestamp: storage for a timestamp set by input_set_timestamp called
131 * by a driver
132 * @inhibited: indicates that the input device is inhibited. If that is
133 * the case then input core ignores any events generated by the device.
134 * Device's close() is called when it is being inhibited and its open()
135 * is called when it is being uninhibited.
136 */
137 struct input_dev {
138 const char *name;
139 const char *phys;
140 const char *uniq;
141 struct input_id id;
142
143 unsigned long propbit[BITS_TO_LONGS(INPUT_PROP_CNT)];
144
145 unsigned long evbit[BITS_TO_LONGS(EV_CNT)];
146 unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];
147 unsigned long relbit[BITS_TO_LONGS(REL_CNT)];
148 unsigned long absbit[BITS_TO_LONGS(ABS_CNT)];
149 unsigned long mscbit[BITS_TO_LONGS(MSC_CNT)];
150 unsigned long ledbit[BITS_TO_LONGS(LED_CNT)];
151 unsigned long sndbit[BITS_TO_LONGS(SND_CNT)];
152 unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
153 unsigned long swbit[BITS_TO_LONGS(SW_CNT)];
154
155 unsigned int hint_events_per_packet;
156
157 unsigned int keycodemax;
158 unsigned int keycodesize;
159 void *keycode;
160
161 int (*setkeycode)(struct input_dev *dev,
162 const struct input_keymap_entry *ke,
163 unsigned int *old_keycode);
164 int (*getkeycode)(struct input_dev *dev,
165 struct input_keymap_entry *ke);
166
167 struct ff_device *ff;
168
169 struct input_dev_poller *poller;
170
171 unsigned int repeat_key;
172 struct timer_list timer;
173
174 int rep[REP_CNT];
175
176 struct input_mt *mt;
177
178 struct input_absinfo *absinfo;
179
180 unsigned long key[BITS_TO_LONGS(KEY_CNT)];
181 unsigned long led[BITS_TO_LONGS(LED_CNT)];
182 unsigned long snd[BITS_TO_LONGS(SND_CNT)];
183 unsigned long sw[BITS_TO_LONGS(SW_CNT)];
184
185 int (*open)(struct input_dev *dev);
186 void (*close)(struct input_dev *dev);
187 int (*flush)(struct input_dev *dev, struct file *file);
188 int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
189
190 struct input_handle __rcu *grab;
191
192 spinlock_t event_lock;
193 struct mutex mutex;
194
195 unsigned int users;
196 bool going_away;
197
198 struct device dev;
199
200 struct list_head h_list;
201 struct list_head node;
202
203 unsigned int num_vals;
204 unsigned int max_vals;
205 struct input_value *vals;
206
207 bool devres_managed;
208
209 ktime_t timestamp[INPUT_CLK_MAX];
210
211 bool inhibited;
212 };
213 #define to_input_dev(d) container_of(d, struct input_dev, dev)
214
215 /*
216 * Verify that we are in sync with input_device_id mod_devicetable.h #defines
217 */
218
219 #if EV_MAX != INPUT_DEVICE_ID_EV_MAX
220 #error "EV_MAX and INPUT_DEVICE_ID_EV_MAX do not match"
221 #endif
222
223 #if KEY_MIN_INTERESTING != INPUT_DEVICE_ID_KEY_MIN_INTERESTING
224 #error "KEY_MIN_INTERESTING and INPUT_DEVICE_ID_KEY_MIN_INTERESTING do not match"
225 #endif
226
227 #if KEY_MAX != INPUT_DEVICE_ID_KEY_MAX
228 #error "KEY_MAX and INPUT_DEVICE_ID_KEY_MAX do not match"
229 #endif
230
231 #if REL_MAX != INPUT_DEVICE_ID_REL_MAX
232 #error "REL_MAX and INPUT_DEVICE_ID_REL_MAX do not match"
233 #endif
234
235 #if ABS_MAX != INPUT_DEVICE_ID_ABS_MAX
236 #error "ABS_MAX and INPUT_DEVICE_ID_ABS_MAX do not match"
237 #endif
238
239 #if MSC_MAX != INPUT_DEVICE_ID_MSC_MAX
240 #error "MSC_MAX and INPUT_DEVICE_ID_MSC_MAX do not match"
241 #endif
242
243 #if LED_MAX != INPUT_DEVICE_ID_LED_MAX
244 #error "LED_MAX and INPUT_DEVICE_ID_LED_MAX do not match"
245 #endif
246
247 #if SND_MAX != INPUT_DEVICE_ID_SND_MAX
248 #error "SND_MAX and INPUT_DEVICE_ID_SND_MAX do not match"
249 #endif
250
251 #if FF_MAX != INPUT_DEVICE_ID_FF_MAX
252 #error "FF_MAX and INPUT_DEVICE_ID_FF_MAX do not match"
253 #endif
254
255 #if SW_MAX != INPUT_DEVICE_ID_SW_MAX
256 #error "SW_MAX and INPUT_DEVICE_ID_SW_MAX do not match"
257 #endif
258
259 #if INPUT_PROP_MAX != INPUT_DEVICE_ID_PROP_MAX
260 #error "INPUT_PROP_MAX and INPUT_DEVICE_ID_PROP_MAX do not match"
261 #endif
262
263 #define INPUT_DEVICE_ID_MATCH_DEVICE \
264 (INPUT_DEVICE_ID_MATCH_BUS | INPUT_DEVICE_ID_MATCH_VENDOR | INPUT_DEVICE_ID_MATCH_PRODUCT)
265 #define INPUT_DEVICE_ID_MATCH_DEVICE_AND_VERSION \
266 (INPUT_DEVICE_ID_MATCH_DEVICE | INPUT_DEVICE_ID_MATCH_VERSION)
267
268 struct input_handle;
269
270 /**
271 * struct input_handler - implements one of interfaces for input devices
272 * @private: driver-specific data
273 * @event: event handler. This method is being called by input core with
274 * interrupts disabled and dev->event_lock spinlock held and so
275 * it may not sleep
276 * @events: event sequence handler. This method is being called by
277 * input core with interrupts disabled and dev->event_lock
278 * spinlock held and so it may not sleep. The method must return
279 * number of events passed to it.
280 * @filter: similar to @event; separates normal event handlers from
281 * "filters".
282 * @match: called after comparing device's id with handler's id_table
283 * to perform fine-grained matching between device and handler
284 * @connect: called when attaching a handler to an input device
285 * @disconnect: disconnects a handler from input device
286 * @start: starts handler for given handle. This function is called by
287 * input core right after connect() method and also when a process
288 * that "grabbed" a device releases it
289 * @legacy_minors: set to %true by drivers using legacy minor ranges
290 * @minor: beginning of range of 32 legacy minors for devices this driver
291 * can provide
292 * @name: name of the handler, to be shown in /proc/bus/input/handlers
293 * @id_table: pointer to a table of input_device_ids this driver can
294 * handle
295 * @h_list: list of input handles associated with the handler
296 * @node: for placing the driver onto input_handler_list
297 *
298 * Input handlers attach to input devices and create input handles. There
299 * are likely several handlers attached to any given input device at the
300 * same time. All of them will get their copy of input event generated by
301 * the device.
302 *
303 * The very same structure is used to implement input filters. Input core
304 * allows filters to run first and will not pass event to regular handlers
305 * if any of the filters indicate that the event should be filtered (by
306 * returning %true from their filter() method).
307 *
308 * Note that input core serializes calls to connect() and disconnect()
309 * methods.
310 */
311 struct input_handler {
312
313 void *private;
314
315 void (*event)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
316 unsigned int (*events)(struct input_handle *handle,
317 struct input_value *vals, unsigned int count);
318 bool (*filter)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
319 bool (*match)(struct input_handler *handler, struct input_dev *dev);
320 int (*connect)(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);
321 void (*disconnect)(struct input_handle *handle);
322 void (*start)(struct input_handle *handle);
323
324 bool legacy_minors;
325 int minor;
326 const char *name;
327
328 const struct input_device_id *id_table;
329
330 struct list_head h_list;
331 struct list_head node;
332 };
333
334 /**
335 * struct input_handle - links input device with an input handler
336 * @private: handler-specific data
337 * @open: counter showing whether the handle is 'open', i.e. should deliver
338 * events from its device
339 * @name: name given to the handle by handler that created it
340 * @dev: input device the handle is attached to
341 * @handler: handler that works with the device through this handle
342 * @d_node: used to put the handle on device's list of attached handles
343 * @h_node: used to put the handle on handler's list of handles from which
344 * it gets events
345 */
346 struct input_handle {
347
348 void *private;
349
350 int open;
351 const char *name;
352
353 struct input_dev *dev;
354 struct input_handler *handler;
355
356 struct list_head d_node;
357 struct list_head h_node;
358 };
359
360 struct input_dev __must_check *input_allocate_device(void);
361 struct input_dev __must_check *devm_input_allocate_device(struct device *);
362 void input_free_device(struct input_dev *dev);
363
364 static inline struct input_dev *input_get_device(struct input_dev *dev)
365 {
366 return dev ? to_input_dev(get_device(&dev->dev)) : NULL;
367 }
368
369 static inline void input_put_device(struct input_dev *dev)
370 {
371 if (dev)
372 put_device(&dev->dev);
373 }
374
375 static inline void *input_get_drvdata(struct input_dev *dev)
376 {
377 return dev_get_drvdata(&dev->dev);
378 }
379
380 static inline void input_set_drvdata(struct input_dev *dev, void *data)
381 {
382 dev_set_drvdata(&dev->dev, data);
383 }
384
385 int __must_check input_register_device(struct input_dev *);
386 void input_unregister_device(struct input_dev *);
387
388 void input_reset_device(struct input_dev *);
389
390 int input_setup_polling(struct input_dev *dev,
391 void (*poll_fn)(struct input_dev *dev));
392 void input_set_poll_interval(struct input_dev *dev, unsigned int interval);
393 void input_set_min_poll_interval(struct input_dev *dev, unsigned int interval);
394 void input_set_max_poll_interval(struct input_dev *dev, unsigned int interval);
395 int input_get_poll_interval(struct input_dev *dev);
396
397 int __must_check input_register_handler(struct input_handler *);
398 void input_unregister_handler(struct input_handler *);
399
400 int __must_check input_get_new_minor(int legacy_base, unsigned int legacy_num,
401 bool allow_dynamic);
402 void input_free_minor(unsigned int minor);
403
404 int input_handler_for_each_handle(struct input_handler *, void *data,
405 int (*fn)(struct input_handle *, void *));
406
407 int input_register_handle(struct input_handle *);
408 void input_unregister_handle(struct input_handle *);
409
410 int input_grab_device(struct input_handle *);
411 void input_release_device(struct input_handle *);
412
413 int input_open_device(struct input_handle *);
414 void input_close_device(struct input_handle *);
415
416 int input_flush_device(struct input_handle *handle, struct file *file);
417
418 void input_set_timestamp(struct input_dev *dev, ktime_t timestamp);
419 ktime_t *input_get_timestamp(struct input_dev *dev);
420
421 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
422 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value);
423
424 static inline void input_report_key(struct input_dev *dev, unsigned int code, int value)
425 {
426 input_event(dev, EV_KEY, code, !!value);
427 }
428
429 static inline void input_report_rel(struct input_dev *dev, unsigned int code, int value)
430 {
431 input_event(dev, EV_REL, code, value);
432 }
433
434 static inline void input_report_abs(struct input_dev *dev, unsigned int code, int value)
435 {
436 input_event(dev, EV_ABS, code, value);
437 }
438
439 static inline void input_report_ff_status(struct input_dev *dev, unsigned int code, int value)
440 {
441 input_event(dev, EV_FF_STATUS, code, value);
442 }
443
444 static inline void input_report_switch(struct input_dev *dev, unsigned int code, int value)
445 {
446 input_event(dev, EV_SW, code, !!value);
447 }
448
449 static inline void input_sync(struct input_dev *dev)
450 {
451 input_event(dev, EV_SYN, SYN_REPORT, 0);
452 }
453
454 static inline void input_mt_sync(struct input_dev *dev)
455 {
456 input_event(dev, EV_SYN, SYN_MT_REPORT, 0);
457 }
458
459 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code);
460
461 /**
462 * input_set_events_per_packet - tell handlers about the driver event rate
463 * @dev: the input device used by the driver
464 * @n_events: the average number of events between calls to input_sync()
465 *
466 * If the event rate sent from a device is unusually large, use this
467 * function to set the expected event rate. This will allow handlers
468 * to set up an appropriate buffer size for the event stream, in order
469 * to minimize information loss.
470 */
471 static inline void input_set_events_per_packet(struct input_dev *dev, int n_events)
472 {
473 dev->hint_events_per_packet = n_events;
474 }
475
476 void input_alloc_absinfo(struct input_dev *dev);
477 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
478 int min, int max, int fuzz, int flat);
479 void input_copy_abs(struct input_dev *dst, unsigned int dst_axis,
480 const struct input_dev *src, unsigned int src_axis);
481
482 #define INPUT_GENERATE_ABS_ACCESSORS(_suffix, _item) \
483 static inline int input_abs_get_##_suffix(struct input_dev *dev, \
484 unsigned int axis) \
485 { \
486 return dev->absinfo ? dev->absinfo[axis]._item : 0; \
487 } \
488 \
489 static inline void input_abs_set_##_suffix(struct input_dev *dev, \
490 unsigned int axis, int val) \
491 { \
492 input_alloc_absinfo(dev); \
493 if (dev->absinfo) \
494 dev->absinfo[axis]._item = val; \
495 }
496
497 INPUT_GENERATE_ABS_ACCESSORS(val, value)
498 INPUT_GENERATE_ABS_ACCESSORS(min, minimum)
499 INPUT_GENERATE_ABS_ACCESSORS(max, maximum)
500 INPUT_GENERATE_ABS_ACCESSORS(fuzz, fuzz)
501 INPUT_GENERATE_ABS_ACCESSORS(flat, flat)
502 INPUT_GENERATE_ABS_ACCESSORS(res, resolution)
503
504 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
505 unsigned int *scancode);
506
507 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke);
508 int input_set_keycode(struct input_dev *dev,
509 const struct input_keymap_entry *ke);
510
511 bool input_match_device_id(const struct input_dev *dev,
512 const struct input_device_id *id);
513
514 void input_enable_softrepeat(struct input_dev *dev, int delay, int period);
515
516 bool input_device_enabled(struct input_dev *dev);
517
518 extern const struct class input_class;
519
520 /**
521 * struct ff_device - force-feedback part of an input device
522 * @upload: Called to upload an new effect into device
523 * @erase: Called to erase an effect from device
524 * @playback: Called to request device to start playing specified effect
525 * @set_gain: Called to set specified gain
526 * @set_autocenter: Called to auto-center device
527 * @destroy: called by input core when parent input device is being
528 * destroyed
529 * @private: driver-specific data, will be freed automatically
530 * @ffbit: bitmap of force feedback capabilities truly supported by
531 * device (not emulated like ones in input_dev->ffbit)
532 * @mutex: mutex for serializing access to the device
533 * @max_effects: maximum number of effects supported by device
534 * @effects: pointer to an array of effects currently loaded into device
535 * @effect_owners: array of effect owners; when file handle owning
536 * an effect gets closed the effect is automatically erased
537 *
538 * Every force-feedback device must implement upload() and playback()
539 * methods; erase() is optional. set_gain() and set_autocenter() need
540 * only be implemented if driver sets up FF_GAIN and FF_AUTOCENTER
541 * bits.
542 *
543 * Note that playback(), set_gain() and set_autocenter() are called with
544 * dev->event_lock spinlock held and interrupts off and thus may not
545 * sleep.
546 */
547 struct ff_device {
548 int (*upload)(struct input_dev *dev, struct ff_effect *effect,
549 struct ff_effect *old);
550 int (*erase)(struct input_dev *dev, int effect_id);
551
552 int (*playback)(struct input_dev *dev, int effect_id, int value);
553 void (*set_gain)(struct input_dev *dev, u16 gain);
554 void (*set_autocenter)(struct input_dev *dev, u16 magnitude);
555
556 void (*destroy)(struct ff_device *);
557
558 void *private;
559
560 unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
561
562 struct mutex mutex;
563
564 int max_effects;
565 struct ff_effect *effects;
566 struct file *effect_owners[] __counted_by(max_effects);
567 };
568
569 int input_ff_create(struct input_dev *dev, unsigned int max_effects);
570 void input_ff_destroy(struct input_dev *dev);
571
572 int input_ff_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
573
574 int input_ff_upload(struct input_dev *dev, struct ff_effect *effect, struct file *file);
575 int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file);
576 int input_ff_flush(struct input_dev *dev, struct file *file);
577
578 int input_ff_create_memless(struct input_dev *dev, void *data,
579 int (*play_effect)(struct input_dev *, void *, struct ff_effect *));
580
581 #endif
582
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