projects/linux·blob v3.16 · refs

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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 */
33struct 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 */
121struct 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
242struct 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 */
284struct 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 */
319struct 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
333struct input_dev __must_check *input_allocate_device(void);
334struct input_dev __must_check *devm_input_allocate_device(struct device *);
335void input_free_device(struct input_dev *dev);
336
337static inline struct input_dev *input_get_device(struct input_dev *dev)
338{
339 return dev ? to_input_dev(get_device(&dev->dev)) : NULL;
340}
341
342static inline void input_put_device(struct input_dev *dev)
343{
344 if (dev)
345 put_device(&dev->dev);
346}
347
348static inline void *input_get_drvdata(struct input_dev *dev)
349{
350 return dev_get_drvdata(&dev->dev);
351}
352
353static inline void input_set_drvdata(struct input_dev *dev, void *data)
354{
355 dev_set_drvdata(&dev->dev, data);
356}
357
358int __must_check input_register_device(struct input_dev *);
359void input_unregister_device(struct input_dev *);
360
361void input_reset_device(struct input_dev *);
362
363int __must_check input_register_handler(struct input_handler *);
364void input_unregister_handler(struct input_handler *);
365
366int __must_check input_get_new_minor(int legacy_base, unsigned int legacy_num,
367 bool allow_dynamic);
368void input_free_minor(unsigned int minor);
369
370int input_handler_for_each_handle(struct input_handler *, void *data,
371 int (*fn)(struct input_handle *, void *));
372
373int input_register_handle(struct input_handle *);
374void input_unregister_handle(struct input_handle *);
375
376int input_grab_device(struct input_handle *);
377void input_release_device(struct input_handle *);
378
379int input_open_device(struct input_handle *);
380void input_close_device(struct input_handle *);
381
382int input_flush_device(struct input_handle *handle, struct file *file);
383
384void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
385void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value);
386
387static inline void input_report_key(struct input_dev *dev, unsigned int code, int value)
388{
389 input_event(dev, EV_KEY, code, !!value);
390}
391
392static inline void input_report_rel(struct input_dev *dev, unsigned int code, int value)
393{
394 input_event(dev, EV_REL, code, value);
395}
396
397static inline void input_report_abs(struct input_dev *dev, unsigned int code, int value)
398{
399 input_event(dev, EV_ABS, code, value);
400}
401
402static 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
407static 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
412static inline void input_sync(struct input_dev *dev)
413{
414 input_event(dev, EV_SYN, SYN_REPORT, 0);
415}
416
417static inline void input_mt_sync(struct input_dev *dev)
418{
419 input_event(dev, EV_SYN, SYN_MT_REPORT, 0);
420}
421
422void 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 */
434static inline void input_set_events_per_packet(struct input_dev *dev, int n_events)
435{
436 dev->hint_events_per_packet = n_events;
437}
438
439void input_alloc_absinfo(struct input_dev *dev);
440void 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) \
444static 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 \
450static 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
458INPUT_GENERATE_ABS_ACCESSORS(val, value)
459INPUT_GENERATE_ABS_ACCESSORS(min, minimum)
460INPUT_GENERATE_ABS_ACCESSORS(max, maximum)
461INPUT_GENERATE_ABS_ACCESSORS(fuzz, fuzz)
462INPUT_GENERATE_ABS_ACCESSORS(flat, flat)
463INPUT_GENERATE_ABS_ACCESSORS(res, resolution)
464
465int input_scancode_to_scalar(const struct input_keymap_entry *ke,
466 unsigned int *scancode);
467
468int input_get_keycode(struct input_dev *dev, struct input_keymap_entry *ke);
469int input_set_keycode(struct input_dev *dev,
470 const struct input_keymap_entry *ke);
471
472extern 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 */
501struct 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
523int input_ff_create(struct input_dev *dev, unsigned int max_effects);
524void input_ff_destroy(struct input_dev *dev);
525
526int input_ff_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
527
528int input_ff_upload(struct input_dev *dev, struct ff_effect *effect, struct file *file);
529int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file);
530
531int input_ff_create_memless(struct input_dev *dev, void *data,
532 int (*play_effect)(struct input_dev *, void *, struct ff_effect *));
533
534#endif