include/linux/input.h

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