include/linux/input.h

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