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
279  * @filter: similar to @event; separates normal event handlers from
280  *	"filters".
281  * @match: called after comparing device's id with handler's id_table
282  *	to perform fine-grained matching between device and handler
283  * @connect: called when attaching a handler to an input device
284  * @disconnect: disconnects a handler from input device
285  * @start: starts handler for given handle. This function is called by
286  *	input core right after connect() method and also when a process
287  *	that "grabbed" a device releases it
288  * @legacy_minors: set to %true by drivers using legacy minor ranges
289  * @minor: beginning of range of 32 legacy minors for devices this driver
290  *	can provide
291  * @name: name of the handler, to be shown in /proc/bus/input/handlers
292  * @id_table: pointer to a table of input_device_ids this driver can
293  *	handle
294  * @h_list: list of input handles associated with the handler
295  * @node: for placing the driver onto input_handler_list
296  *
297  * Input handlers attach to input devices and create input handles. There
298  * are likely several handlers attached to any given input device at the
299  * same time. All of them will get their copy of input event generated by
300  * the device.
301  *
302  * The very same structure is used to implement input filters. Input core
303  * allows filters to run first and will not pass event to regular handlers
304  * if any of the filters indicate that the event should be filtered (by
305  * returning %true from their filter() method).
306  *
307  * Note that input core serializes calls to connect() and disconnect()
308  * methods.
309  */
310 struct input_handler {
311 
312 	void *private;
313 
314 	void (*event)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
315 	void (*events)(struct input_handle *handle,
316 		       const struct input_value *vals, unsigned int count);
317 	bool (*filter)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
318 	bool (*match)(struct input_handler *handler, struct input_dev *dev);
319 	int (*connect)(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);
320 	void (*disconnect)(struct input_handle *handle);
321 	void (*start)(struct input_handle *handle);
322 
323 	bool legacy_minors;
324 	int minor;
325 	const char *name;
326 
327 	const struct input_device_id *id_table;
328 
329 	struct list_head	h_list;
330 	struct list_head	node;
331 };
332 
333 /**
334  * struct input_handle - links input device with an input handler
335  * @private: handler-specific data
336  * @open: counter showing whether the handle is 'open', i.e. should deliver
337  *	events from its device
338  * @name: name given to the handle by handler that created it
339  * @dev: input device the handle is attached to
340  * @handler: handler that works with the device through this handle
341  * @d_node: used to put the handle on device's list of attached handles
342  * @h_node: used to put the handle on handler's list of handles from which
343  *	it gets events
344  */
345 struct input_handle {
346 
347 	void *private;
348 
349 	int open;
350 	const char *name;
351 
352 	struct input_dev *dev;
353 	struct input_handler *handler;
354 
355 	struct list_head	d_node;
356 	struct list_head	h_node;
357 };
358 
359 struct input_dev __must_check *input_allocate_device(void);
360 struct input_dev __must_check *devm_input_allocate_device(struct device *);
361 void input_free_device(struct input_dev *dev);
362 
input_get_device(struct input_dev * dev)363 static inline struct input_dev *input_get_device(struct input_dev *dev)
364 {
365 	return dev ? to_input_dev(get_device(&dev->dev)) : NULL;
366 }
367 
input_put_device(struct input_dev * dev)368 static inline void input_put_device(struct input_dev *dev)
369 {
370 	if (dev)
371 		put_device(&dev->dev);
372 }
373 
input_get_drvdata(struct input_dev * dev)374 static inline void *input_get_drvdata(struct input_dev *dev)
375 {
376 	return dev_get_drvdata(&dev->dev);
377 }
378 
input_set_drvdata(struct input_dev * dev,void * data)379 static inline void input_set_drvdata(struct input_dev *dev, void *data)
380 {
381 	dev_set_drvdata(&dev->dev, data);
382 }
383 
384 int __must_check input_register_device(struct input_dev *);
385 void input_unregister_device(struct input_dev *);
386 
387 void input_reset_device(struct input_dev *);
388 
389 int input_setup_polling(struct input_dev *dev,
390 			void (*poll_fn)(struct input_dev *dev));
391 void input_set_poll_interval(struct input_dev *dev, unsigned int interval);
392 void input_set_min_poll_interval(struct input_dev *dev, unsigned int interval);
393 void input_set_max_poll_interval(struct input_dev *dev, unsigned int interval);
394 int input_get_poll_interval(struct input_dev *dev);
395 
396 int __must_check input_register_handler(struct input_handler *);
397 void input_unregister_handler(struct input_handler *);
398 
399 int __must_check input_get_new_minor(int legacy_base, unsigned int legacy_num,
400 				     bool allow_dynamic);
401 void input_free_minor(unsigned int minor);
402 
403 int input_handler_for_each_handle(struct input_handler *, void *data,
404 				  int (*fn)(struct input_handle *, void *));
405 
406 int input_register_handle(struct input_handle *);
407 void input_unregister_handle(struct input_handle *);
408 
409 int input_grab_device(struct input_handle *);
410 void input_release_device(struct input_handle *);
411 
412 int input_open_device(struct input_handle *);
413 void input_close_device(struct input_handle *);
414 
415 int input_flush_device(struct input_handle *handle, struct file *file);
416 
417 void input_set_timestamp(struct input_dev *dev, ktime_t timestamp);
418 ktime_t *input_get_timestamp(struct input_dev *dev);
419 
420 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
421 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value);
422 
input_report_key(struct input_dev * dev,unsigned int code,int value)423 static inline void input_report_key(struct input_dev *dev, unsigned int code, int value)
424 {
425 	input_event(dev, EV_KEY, code, !!value);
426 }
427 
input_report_rel(struct input_dev * dev,unsigned int code,int value)428 static inline void input_report_rel(struct input_dev *dev, unsigned int code, int value)
429 {
430 	input_event(dev, EV_REL, code, value);
431 }
432 
input_report_abs(struct input_dev * dev,unsigned int code,int value)433 static inline void input_report_abs(struct input_dev *dev, unsigned int code, int value)
434 {
435 	input_event(dev, EV_ABS, code, value);
436 }
437 
input_report_ff_status(struct input_dev * dev,unsigned int code,int value)438 static inline void input_report_ff_status(struct input_dev *dev, unsigned int code, int value)
439 {
440 	input_event(dev, EV_FF_STATUS, code, value);
441 }
442 
input_report_switch(struct input_dev * dev,unsigned int code,int value)443 static inline void input_report_switch(struct input_dev *dev, unsigned int code, int value)
444 {
445 	input_event(dev, EV_SW, code, !!value);
446 }
447 
input_sync(struct input_dev * dev)448 static inline void input_sync(struct input_dev *dev)
449 {
450 	input_event(dev, EV_SYN, SYN_REPORT, 0);
451 }
452 
input_mt_sync(struct input_dev * dev)453 static inline void input_mt_sync(struct input_dev *dev)
454 {
455 	input_event(dev, EV_SYN, SYN_MT_REPORT, 0);
456 }
457 
458 void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code);
459 
460 /**
461  * input_set_events_per_packet - tell handlers about the driver event rate
462  * @dev: the input device used by the driver
463  * @n_events: the average number of events between calls to input_sync()
464  *
465  * If the event rate sent from a device is unusually large, use this
466  * function to set the expected event rate. This will allow handlers
467  * to set up an appropriate buffer size for the event stream, in order
468  * to minimize information loss.
469  */
input_set_events_per_packet(struct input_dev * dev,int n_events)470 static inline void input_set_events_per_packet(struct input_dev *dev, int n_events)
471 {
472 	dev->hint_events_per_packet = n_events;
473 }
474 
475 void input_alloc_absinfo(struct input_dev *dev);
476 void input_set_abs_params(struct input_dev *dev, unsigned int axis,
477 			  int min, int max, int fuzz, int flat);
478 void input_copy_abs(struct input_dev *dst, unsigned int dst_axis,
479 		    const struct input_dev *src, unsigned int src_axis);
480 
481 #define INPUT_GENERATE_ABS_ACCESSORS(_suffix, _item)			\
482 static inline int input_abs_get_##_suffix(struct input_dev *dev,	\
483 					  unsigned int axis)		\
484 {									\
485 	return dev->absinfo ? dev->absinfo[axis]._item : 0;		\
486 }									\
487 									\
488 static inline void input_abs_set_##_suffix(struct input_dev *dev,	\
489 					   unsigned int axis, int val)	\
490 {									\
491 	input_alloc_absinfo(dev);					\
492 	if (dev->absinfo)						\
493 		dev->absinfo[axis]._item = val;				\
494 }
495 
496 INPUT_GENERATE_ABS_ACCESSORS(val, value)
497 INPUT_GENERATE_ABS_ACCESSORS(min, minimum)
498 INPUT_GENERATE_ABS_ACCESSORS(max, maximum)
499 INPUT_GENERATE_ABS_ACCESSORS(fuzz, fuzz)
500 INPUT_GENERATE_ABS_ACCESSORS(flat, flat)
501 INPUT_GENERATE_ABS_ACCESSORS(res, resolution)
502 
503 int input_scancode_to_scalar(const struct input_keymap_entry *ke,
504 			     unsigned int *scancode);
505 
506 int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke);
507 int input_set_keycode(struct input_dev *dev,
508 		      const struct input_keymap_entry *ke);
509 
510 bool input_match_device_id(const struct input_dev *dev,
511 			   const struct input_device_id *id);
512 
513 void input_enable_softrepeat(struct input_dev *dev, int delay, int period);
514 
515 bool input_device_enabled(struct input_dev *dev);
516 
517 extern struct class input_class;
518 
519 /**
520  * struct ff_device - force-feedback part of an input device
521  * @upload: Called to upload an new effect into device
522  * @erase: Called to erase an effect from device
523  * @playback: Called to request device to start playing specified effect
524  * @set_gain: Called to set specified gain
525  * @set_autocenter: Called to auto-center device
526  * @destroy: called by input core when parent input device is being
527  *	destroyed
528  * @private: driver-specific data, will be freed automatically
529  * @ffbit: bitmap of force feedback capabilities truly supported by
530  *	device (not emulated like ones in input_dev->ffbit)
531  * @mutex: mutex for serializing access to the device
532  * @max_effects: maximum number of effects supported by device
533  * @effects: pointer to an array of effects currently loaded into device
534  * @effect_owners: array of effect owners; when file handle owning
535  *	an effect gets closed the effect is automatically erased
536  *
537  * Every force-feedback device must implement upload() and playback()
538  * methods; erase() is optional. set_gain() and set_autocenter() need
539  * only be implemented if driver sets up FF_GAIN and FF_AUTOCENTER
540  * bits.
541  *
542  * Note that playback(), set_gain() and set_autocenter() are called with
543  * dev->event_lock spinlock held and interrupts off and thus may not
544  * sleep.
545  */
546 struct ff_device {
547 	int (*upload)(struct input_dev *dev, struct ff_effect *effect,
548 		      struct ff_effect *old);
549 	int (*erase)(struct input_dev *dev, int effect_id);
550 
551 	int (*playback)(struct input_dev *dev, int effect_id, int value);
552 	void (*set_gain)(struct input_dev *dev, u16 gain);
553 	void (*set_autocenter)(struct input_dev *dev, u16 magnitude);
554 
555 	void (*destroy)(struct ff_device *);
556 
557 	void *private;
558 
559 	unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
560 
561 	struct mutex mutex;
562 
563 	int max_effects;
564 	struct ff_effect *effects;
565 	struct file *effect_owners[];
566 };
567 
568 int input_ff_create(struct input_dev *dev, unsigned int max_effects);
569 void input_ff_destroy(struct input_dev *dev);
570 
571 int input_ff_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
572 
573 int input_ff_upload(struct input_dev *dev, struct ff_effect *effect, struct file *file);
574 int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file);
575 int input_ff_flush(struct input_dev *dev, struct file *file);
576 
577 int input_ff_create_memless(struct input_dev *dev, void *data,
578 		int (*play_effect)(struct input_dev *, void *, struct ff_effect *));
579 
580 #endif
581