Branch data Line data Source code
1 : : /*
2 : : * Copyright (c) 1999-2002 Vojtech Pavlik
3 : : *
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.
7 : : */
8 : : #ifndef _INPUT_H
9 : : #define _INPUT_H
10 : :
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
17 : :
18 : : /*
19 : : * In-kernel definitions.
20 : : */
21 : :
22 : : #include <linux/device.h>
23 : : #include <linux/fs.h>
24 : : #include <linux/timer.h>
25 : : #include <linux/mod_devicetable.h>
26 : :
27 : : /**
28 : : * struct input_value - input value representation
29 : : * @type: type of value (EV_KEY, EV_ABS, etc)
30 : : * @code: the value code
31 : : * @value: the value
32 : : */
33 : : struct input_value {
34 : : __u16 type;
35 : : __u16 code;
36 : : __s32 value;
37 : : };
38 : :
39 : : /**
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,
47 : : * EV_REL, etc.)
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
59 : : * events.
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
67 : : * not sleep
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
71 : : * software autorepeat
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,
77 : : * resolution)
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
90 : : * from it
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
115 : : * @num_vals: number of values queued in the current frame
116 : : * @max_vals: maximum number of values queued in a frame
117 : : * @vals: array of values queued in the current frame
118 : : * @devres_managed: indicates that devices is managed with devres framework
119 : : * and needs not be explicitly unregistered or freed.
120 : : */
121 : : struct input_dev {
122 : : const char *name;
123 : : const char *phys;
124 : : const char *uniq;
125 : : struct input_id id;
126 : :
127 : : unsigned long propbit[BITS_TO_LONGS(INPUT_PROP_CNT)];
128 : :
129 : : unsigned long evbit[BITS_TO_LONGS(EV_CNT)];
130 : : unsigned long keybit[BITS_TO_LONGS(KEY_CNT)];
131 : : unsigned long relbit[BITS_TO_LONGS(REL_CNT)];
132 : : unsigned long absbit[BITS_TO_LONGS(ABS_CNT)];
133 : : unsigned long mscbit[BITS_TO_LONGS(MSC_CNT)];
134 : : unsigned long ledbit[BITS_TO_LONGS(LED_CNT)];
135 : : unsigned long sndbit[BITS_TO_LONGS(SND_CNT)];
136 : : unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
137 : : unsigned long swbit[BITS_TO_LONGS(SW_CNT)];
138 : :
139 : : unsigned int hint_events_per_packet;
140 : :
141 : : unsigned int keycodemax;
142 : : unsigned int keycodesize;
143 : : void *keycode;
144 : :
145 : : int (*setkeycode)(struct input_dev *dev,
146 : : const struct input_keymap_entry *ke,
147 : : unsigned int *old_keycode);
148 : : int (*getkeycode)(struct input_dev *dev,
149 : : struct input_keymap_entry *ke);
150 : :
151 : : struct ff_device *ff;
152 : :
153 : : unsigned int repeat_key;
154 : : struct timer_list timer;
155 : :
156 : : int rep[REP_CNT];
157 : :
158 : : struct input_mt *mt;
159 : :
160 : : struct input_absinfo *absinfo;
161 : :
162 : : unsigned long key[BITS_TO_LONGS(KEY_CNT)];
163 : : unsigned long led[BITS_TO_LONGS(LED_CNT)];
164 : : unsigned long snd[BITS_TO_LONGS(SND_CNT)];
165 : : unsigned long sw[BITS_TO_LONGS(SW_CNT)];
166 : :
167 : : int (*open)(struct input_dev *dev);
168 : : void (*close)(struct input_dev *dev);
169 : : int (*flush)(struct input_dev *dev, struct file *file);
170 : : int (*event)(struct input_dev *dev, unsigned int type, unsigned int code, int value);
171 : :
172 : : struct input_handle __rcu *grab;
173 : :
174 : : spinlock_t event_lock;
175 : : struct mutex mutex;
176 : :
177 : : unsigned int users;
178 : : bool going_away;
179 : :
180 : : struct device dev;
181 : :
182 : : struct list_head h_list;
183 : : struct list_head node;
184 : :
185 : : unsigned int num_vals;
186 : : unsigned int max_vals;
187 : : struct input_value *vals;
188 : :
189 : : bool devres_managed;
190 : : };
191 : : #define to_input_dev(d) container_of(d, struct input_dev, dev)
192 : :
193 : : /*
194 : : * Verify that we are in sync with input_device_id mod_devicetable.h #defines
195 : : */
196 : :
197 : : #if EV_MAX != INPUT_DEVICE_ID_EV_MAX
198 : : #error "EV_MAX and INPUT_DEVICE_ID_EV_MAX do not match"
199 : : #endif
200 : :
201 : : #if KEY_MIN_INTERESTING != INPUT_DEVICE_ID_KEY_MIN_INTERESTING
202 : : #error "KEY_MIN_INTERESTING and INPUT_DEVICE_ID_KEY_MIN_INTERESTING do not match"
203 : : #endif
204 : :
205 : : #if KEY_MAX != INPUT_DEVICE_ID_KEY_MAX
206 : : #error "KEY_MAX and INPUT_DEVICE_ID_KEY_MAX do not match"
207 : : #endif
208 : :
209 : : #if REL_MAX != INPUT_DEVICE_ID_REL_MAX
210 : : #error "REL_MAX and INPUT_DEVICE_ID_REL_MAX do not match"
211 : : #endif
212 : :
213 : : #if ABS_MAX != INPUT_DEVICE_ID_ABS_MAX
214 : : #error "ABS_MAX and INPUT_DEVICE_ID_ABS_MAX do not match"
215 : : #endif
216 : :
217 : : #if MSC_MAX != INPUT_DEVICE_ID_MSC_MAX
218 : : #error "MSC_MAX and INPUT_DEVICE_ID_MSC_MAX do not match"
219 : : #endif
220 : :
221 : : #if LED_MAX != INPUT_DEVICE_ID_LED_MAX
222 : : #error "LED_MAX and INPUT_DEVICE_ID_LED_MAX do not match"
223 : : #endif
224 : :
225 : : #if SND_MAX != INPUT_DEVICE_ID_SND_MAX
226 : : #error "SND_MAX and INPUT_DEVICE_ID_SND_MAX do not match"
227 : : #endif
228 : :
229 : : #if FF_MAX != INPUT_DEVICE_ID_FF_MAX
230 : : #error "FF_MAX and INPUT_DEVICE_ID_FF_MAX do not match"
231 : : #endif
232 : :
233 : : #if SW_MAX != INPUT_DEVICE_ID_SW_MAX
234 : : #error "SW_MAX and INPUT_DEVICE_ID_SW_MAX do not match"
235 : : #endif
236 : :
237 : : #define INPUT_DEVICE_ID_MATCH_DEVICE \
238 : : (INPUT_DEVICE_ID_MATCH_BUS | INPUT_DEVICE_ID_MATCH_VENDOR | INPUT_DEVICE_ID_MATCH_PRODUCT)
239 : : #define INPUT_DEVICE_ID_MATCH_DEVICE_AND_VERSION \
240 : : (INPUT_DEVICE_ID_MATCH_DEVICE | INPUT_DEVICE_ID_MATCH_VERSION)
241 : :
242 : : struct input_handle;
243 : :
244 : : /**
245 : : * struct input_handler - implements one of interfaces for input devices
246 : : * @private: driver-specific data
247 : : * @event: event handler. This method is being called by input core with
248 : : * interrupts disabled and dev->event_lock spinlock held and so
249 : : * it may not sleep
250 : : * @events: event sequence handler. This method is being called by
251 : : * input core with interrupts disabled and dev->event_lock
252 : : * spinlock held and so it may not sleep
253 : : * @filter: similar to @event; separates normal event handlers from
254 : : * "filters".
255 : : * @match: called after comparing device's id with handler's id_table
256 : : * to perform fine-grained matching between device and handler
257 : : * @connect: called when attaching a handler to an input device
258 : : * @disconnect: disconnects a handler from input device
259 : : * @start: starts handler for given handle. This function is called by
260 : : * input core right after connect() method and also when a process
261 : : * that "grabbed" a device releases it
262 : : * @legacy_minors: set to %true by drivers using legacy minor ranges
263 : : * @minor: beginning of range of 32 legacy minors for devices this driver
264 : : * can provide
265 : : * @name: name of the handler, to be shown in /proc/bus/input/handlers
266 : : * @id_table: pointer to a table of input_device_ids this driver can
267 : : * handle
268 : : * @h_list: list of input handles associated with the handler
269 : : * @node: for placing the driver onto input_handler_list
270 : : *
271 : : * Input handlers attach to input devices and create input handles. There
272 : : * are likely several handlers attached to any given input device at the
273 : : * same time. All of them will get their copy of input event generated by
274 : : * the device.
275 : : *
276 : : * The very same structure is used to implement input filters. Input core
277 : : * allows filters to run first and will not pass event to regular handlers
278 : : * if any of the filters indicate that the event should be filtered (by
279 : : * returning %true from their filter() method).
280 : : *
281 : : * Note that input core serializes calls to connect() and disconnect()
282 : : * methods.
283 : : */
284 : : struct input_handler {
285 : :
286 : : void *private;
287 : :
288 : : void (*event)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
289 : : void (*events)(struct input_handle *handle,
290 : : const struct input_value *vals, unsigned int count);
291 : : bool (*filter)(struct input_handle *handle, unsigned int type, unsigned int code, int value);
292 : : bool (*match)(struct input_handler *handler, struct input_dev *dev);
293 : : int (*connect)(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);
294 : : void (*disconnect)(struct input_handle *handle);
295 : : void (*start)(struct input_handle *handle);
296 : :
297 : : bool legacy_minors;
298 : : int minor;
299 : : const char *name;
300 : :
301 : : const struct input_device_id *id_table;
302 : :
303 : : struct list_head h_list;
304 : : struct list_head node;
305 : : };
306 : :
307 : : /**
308 : : * struct input_handle - links input device with an input handler
309 : : * @private: handler-specific data
310 : : * @open: counter showing whether the handle is 'open', i.e. should deliver
311 : : * events from its device
312 : : * @name: name given to the handle by handler that created it
313 : : * @dev: input device the handle is attached to
314 : : * @handler: handler that works with the device through this handle
315 : : * @d_node: used to put the handle on device's list of attached handles
316 : : * @h_node: used to put the handle on handler's list of handles from which
317 : : * it gets events
318 : : */
319 : : struct input_handle {
320 : :
321 : : void *private;
322 : :
323 : : int open;
324 : : const char *name;
325 : :
326 : : struct input_dev *dev;
327 : : struct input_handler *handler;
328 : :
329 : : struct list_head d_node;
330 : : struct list_head h_node;
331 : : };
332 : :
333 : : struct input_dev __must_check *input_allocate_device(void);
334 : : struct input_dev __must_check *devm_input_allocate_device(struct device *);
335 : : void input_free_device(struct input_dev *dev);
336 : :
337 : : static inline struct input_dev *input_get_device(struct input_dev *dev)
338 : : {
339 [ + - ][ + - ]: 4 : return dev ? to_input_dev(get_device(&dev->dev)) : NULL;
340 : : }
341 : :
342 : : static inline void input_put_device(struct input_dev *dev)
343 : : {
344 [ + - ][ + - ]: 6 : if (dev)
[ # # ][ # # ]
345 : 6 : put_device(&dev->dev);
346 : : }
347 : :
348 : : static inline void *input_get_drvdata(struct input_dev *dev)
349 : : {
350 : 12 : return dev_get_drvdata(&dev->dev);
351 : : }
352 : :
353 : : static inline void input_set_drvdata(struct input_dev *dev, void *data)
354 : : {
355 : 2 : dev_set_drvdata(&dev->dev, data);
356 : : }
357 : :
358 : : int __must_check input_register_device(struct input_dev *);
359 : : void input_unregister_device(struct input_dev *);
360 : :
361 : : void input_reset_device(struct input_dev *);
362 : :
363 : : int __must_check input_register_handler(struct input_handler *);
364 : : void input_unregister_handler(struct input_handler *);
365 : :
366 : : int __must_check input_get_new_minor(int legacy_base, unsigned int legacy_num,
367 : : bool allow_dynamic);
368 : : void input_free_minor(unsigned int minor);
369 : :
370 : : int input_handler_for_each_handle(struct input_handler *, void *data,
371 : : int (*fn)(struct input_handle *, void *));
372 : :
373 : : int input_register_handle(struct input_handle *);
374 : : void input_unregister_handle(struct input_handle *);
375 : :
376 : : int input_grab_device(struct input_handle *);
377 : : void input_release_device(struct input_handle *);
378 : :
379 : : int input_open_device(struct input_handle *);
380 : : void input_close_device(struct input_handle *);
381 : :
382 : : int input_flush_device(struct input_handle *handle, struct file *file);
383 : :
384 : : void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
385 : : void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value);
386 : :
387 : : static inline void input_report_key(struct input_dev *dev, unsigned int code, int value)
388 : : {
389 : 0 : input_event(dev, EV_KEY, code, !!value);
390 : : }
391 : :
392 : : static inline void input_report_rel(struct input_dev *dev, unsigned int code, int value)
393 : : {
394 : 0 : input_event(dev, EV_REL, code, value);
395 : : }
396 : :
397 : : static inline void input_report_abs(struct input_dev *dev, unsigned int code, int value)
398 : : {
399 : 0 : input_event(dev, EV_ABS, code, value);
400 : : }
401 : :
402 : : static inline void input_report_ff_status(struct input_dev *dev, unsigned int code, int value)
403 : : {
404 : : input_event(dev, EV_FF_STATUS, code, value);
405 : : }
406 : :
407 : : static inline void input_report_switch(struct input_dev *dev, unsigned int code, int value)
408 : : {
409 : : input_event(dev, EV_SW, code, !!value);
410 : : }
411 : :
412 : : static inline void input_sync(struct input_dev *dev)
413 : : {
414 : 0 : input_event(dev, EV_SYN, SYN_REPORT, 0);
415 : : }
416 : :
417 : : static inline void input_mt_sync(struct input_dev *dev)
418 : : {
419 : : input_event(dev, EV_SYN, SYN_MT_REPORT, 0);
420 : : }
421 : :
422 : : void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code);
423 : :
424 : : /**
425 : : * input_set_events_per_packet - tell handlers about the driver event rate
426 : : * @dev: the input device used by the driver
427 : : * @n_events: the average number of events between calls to input_sync()
428 : : *
429 : : * If the event rate sent from a device is unusually large, use this
430 : : * function to set the expected event rate. This will allow handlers
431 : : * to set up an appropriate buffer size for the event stream, in order
432 : : * to minimize information loss.
433 : : */
434 : : static inline void input_set_events_per_packet(struct input_dev *dev, int n_events)
435 : : {
436 : 0 : dev->hint_events_per_packet = n_events;
437 : : }
438 : :
439 : : void input_alloc_absinfo(struct input_dev *dev);
440 : : void input_set_abs_params(struct input_dev *dev, unsigned int axis,
441 : : int min, int max, int fuzz, int flat);
442 : :
443 : : #define INPUT_GENERATE_ABS_ACCESSORS(_suffix, _item) \
444 : : static inline int input_abs_get_##_suffix(struct input_dev *dev, \
445 : : unsigned int axis) \
446 : : { \
447 : : return dev->absinfo ? dev->absinfo[axis]._item : 0; \
448 : : } \
449 : : \
450 : : static inline void input_abs_set_##_suffix(struct input_dev *dev, \
451 : : unsigned int axis, int val) \
452 : : { \
453 : : input_alloc_absinfo(dev); \
454 : : if (dev->absinfo) \
455 : : dev->absinfo[axis]._item = val; \
456 : : }
457 : :
458 [ # # ][ # # ]: 0 : INPUT_GENERATE_ABS_ACCESSORS(val, value)
459 [ # # ][ # # ]: 0 : INPUT_GENERATE_ABS_ACCESSORS(min, minimum)
[ # # ][ # # ]
[ # ][ # ][ # ]
[ # ][ # # ]
460 [ # # ][ # # ]: 0 : INPUT_GENERATE_ABS_ACCESSORS(max, maximum)
[ # # ][ # # ]
[ # ][ # ][ # ]
[ # ][ # # ]
[ # # ]
461 [ # # ]: 0 : INPUT_GENERATE_ABS_ACCESSORS(fuzz, fuzz)
462 [ # # ][ # # ]: 0 : INPUT_GENERATE_ABS_ACCESSORS(flat, flat)
[ # # ]
463 [ # # ][ # # ]: 0 : INPUT_GENERATE_ABS_ACCESSORS(res, resolution)
[ # # ][ # # ]
[ # # ][ # # ]
464 : :
465 : : int input_scancode_to_scalar(const struct input_keymap_entry *ke,
466 : : unsigned int *scancode);
467 : :
468 : : int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke);
469 : : int input_set_keycode(struct input_dev *dev,
470 : : const struct input_keymap_entry *ke);
471 : :
472 : : extern struct class input_class;
473 : :
474 : : /**
475 : : * struct ff_device - force-feedback part of an input device
476 : : * @upload: Called to upload an new effect into device
477 : : * @erase: Called to erase an effect from device
478 : : * @playback: Called to request device to start playing specified effect
479 : : * @set_gain: Called to set specified gain
480 : : * @set_autocenter: Called to auto-center device
481 : : * @destroy: called by input core when parent input device is being
482 : : * destroyed
483 : : * @private: driver-specific data, will be freed automatically
484 : : * @ffbit: bitmap of force feedback capabilities truly supported by
485 : : * device (not emulated like ones in input_dev->ffbit)
486 : : * @mutex: mutex for serializing access to the device
487 : : * @max_effects: maximum number of effects supported by device
488 : : * @effects: pointer to an array of effects currently loaded into device
489 : : * @effect_owners: array of effect owners; when file handle owning
490 : : * an effect gets closed the effect is automatically erased
491 : : *
492 : : * Every force-feedback device must implement upload() and playback()
493 : : * methods; erase() is optional. set_gain() and set_autocenter() need
494 : : * only be implemented if driver sets up FF_GAIN and FF_AUTOCENTER
495 : : * bits.
496 : : *
497 : : * Note that playback(), set_gain() and set_autocenter() are called with
498 : : * dev->event_lock spinlock held and interrupts off and thus may not
499 : : * sleep.
500 : : */
501 : : struct ff_device {
502 : : int (*upload)(struct input_dev *dev, struct ff_effect *effect,
503 : : struct ff_effect *old);
504 : : int (*erase)(struct input_dev *dev, int effect_id);
505 : :
506 : : int (*playback)(struct input_dev *dev, int effect_id, int value);
507 : : void (*set_gain)(struct input_dev *dev, u16 gain);
508 : : void (*set_autocenter)(struct input_dev *dev, u16 magnitude);
509 : :
510 : : void (*destroy)(struct ff_device *);
511 : :
512 : : void *private;
513 : :
514 : : unsigned long ffbit[BITS_TO_LONGS(FF_CNT)];
515 : :
516 : : struct mutex mutex;
517 : :
518 : : int max_effects;
519 : : struct ff_effect *effects;
520 : : struct file *effect_owners[];
521 : : };
522 : :
523 : : int input_ff_create(struct input_dev *dev, unsigned int max_effects);
524 : : void input_ff_destroy(struct input_dev *dev);
525 : :
526 : : int input_ff_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
527 : :
528 : : int input_ff_upload(struct input_dev *dev, struct ff_effect *effect, struct file *file);
529 : : int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file);
530 : :
531 : : int input_ff_create_memless(struct input_dev *dev, void *data,
532 : : int (*play_effect)(struct input_dev *, void *, struct ff_effect *));
533 : :
534 : : #endif
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