blob: a9b025f4147a0692845d2407b6efbd9220f9837e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * The input core
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 */
6
7/*
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published by
10 * the Free Software Foundation.
11 */
12
13#include <linux/init.h>
Dmitry Torokhovffd0db92009-09-16 01:06:43 -070014#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/input.h>
16#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/random.h>
19#include <linux/major.h>
20#include <linux/proc_fs.h>
Alexey Dobriyana99bbaf2009-10-04 16:11:37 +040021#include <linux/sched.h>
Dmitry Torokhov969b21c2006-04-02 00:09:34 -050022#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/poll.h>
24#include <linux/device.h>
Jes Sorensene676c232006-02-19 00:21:46 -050025#include <linux/mutex.h>
Dmitry Torokhov80064792007-08-30 00:22:11 -040026#include <linux/rcupdate.h>
Jonathan Corbet2edbf852008-05-15 10:37:16 -060027#include <linux/smp_lock.h>
Dmitry Torokhov15e184a2010-01-11 00:05:43 -080028#include "input-compat.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
31MODULE_DESCRIPTION("Input core");
32MODULE_LICENSE("GPL");
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#define INPUT_DEVICES 256
35
36static LIST_HEAD(input_dev_list);
37static LIST_HEAD(input_handler_list);
38
Dmitry Torokhov80064792007-08-30 00:22:11 -040039/*
40 * input_mutex protects access to both input_dev_list and input_handler_list.
41 * This also causes input_[un]register_device and input_[un]register_handler
42 * be mutually exclusive which simplifies locking in drivers implementing
43 * input handlers.
44 */
45static DEFINE_MUTEX(input_mutex);
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047static struct input_handler *input_table[8];
48
Dmitry Torokhov80064792007-08-30 00:22:11 -040049static inline int is_event_supported(unsigned int code,
50 unsigned long *bm, unsigned int max)
51{
52 return code <= max && test_bit(code, bm);
53}
54
55static int input_defuzz_abs_event(int value, int old_val, int fuzz)
56{
57 if (fuzz) {
58 if (value > old_val - fuzz / 2 && value < old_val + fuzz / 2)
59 return old_val;
60
61 if (value > old_val - fuzz && value < old_val + fuzz)
62 return (old_val * 3 + value) / 4;
63
64 if (value > old_val - fuzz * 2 && value < old_val + fuzz * 2)
65 return (old_val + value) / 2;
66 }
67
68 return value;
69}
70
71/*
Dmitry Torokhovef7995f2010-01-29 23:59:12 -080072 * Pass event first through all filters and then, if event has not been
73 * filtered out, through all open handles. This function is called with
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -040074 * dev->event_lock held and interrupts disabled.
Dmitry Torokhov80064792007-08-30 00:22:11 -040075 */
76static void input_pass_event(struct input_dev *dev,
77 unsigned int type, unsigned int code, int value)
78{
Dmitry Torokhovef7995f2010-01-29 23:59:12 -080079 struct input_handler *handler;
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -040080 struct input_handle *handle;
Dmitry Torokhov80064792007-08-30 00:22:11 -040081
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -040082 rcu_read_lock();
83
84 handle = rcu_dereference(dev->grab);
Dmitry Torokhov80064792007-08-30 00:22:11 -040085 if (handle)
86 handle->handler->event(handle, type, code, value);
Dmitry Torokhovef7995f2010-01-29 23:59:12 -080087 else {
88 bool filtered = false;
89
90 list_for_each_entry_rcu(handle, &dev->h_list, d_node) {
91 if (!handle->open)
92 continue;
93
94 handler = handle->handler;
95 if (!handler->filter) {
96 if (filtered)
97 break;
98
99 handler->event(handle, type, code, value);
100
101 } else if (handler->filter(handle, type, code, value))
102 filtered = true;
103 }
104 }
105
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400106 rcu_read_unlock();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400107}
108
109/*
110 * Generate software autorepeat event. Note that we take
111 * dev->event_lock here to avoid racing with input_event
112 * which may cause keys get "stuck".
113 */
114static void input_repeat_key(unsigned long data)
115{
116 struct input_dev *dev = (void *) data;
117 unsigned long flags;
118
119 spin_lock_irqsave(&dev->event_lock, flags);
120
121 if (test_bit(dev->repeat_key, dev->key) &&
122 is_event_supported(dev->repeat_key, dev->keybit, KEY_MAX)) {
123
124 input_pass_event(dev, EV_KEY, dev->repeat_key, 2);
125
126 if (dev->sync) {
127 /*
128 * Only send SYN_REPORT if we are not in a middle
129 * of driver parsing a new hardware packet.
130 * Otherwise assume that the driver will send
131 * SYN_REPORT once it's done.
132 */
133 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
134 }
135
136 if (dev->rep[REP_PERIOD])
137 mod_timer(&dev->timer, jiffies +
138 msecs_to_jiffies(dev->rep[REP_PERIOD]));
139 }
140
141 spin_unlock_irqrestore(&dev->event_lock, flags);
142}
143
144static void input_start_autorepeat(struct input_dev *dev, int code)
145{
146 if (test_bit(EV_REP, dev->evbit) &&
147 dev->rep[REP_PERIOD] && dev->rep[REP_DELAY] &&
148 dev->timer.data) {
149 dev->repeat_key = code;
150 mod_timer(&dev->timer,
151 jiffies + msecs_to_jiffies(dev->rep[REP_DELAY]));
152 }
153}
154
Johannes Berge7b5c1e2009-01-29 23:17:52 -0800155static void input_stop_autorepeat(struct input_dev *dev)
156{
157 del_timer(&dev->timer);
158}
159
Dmitry Torokhov80064792007-08-30 00:22:11 -0400160#define INPUT_IGNORE_EVENT 0
161#define INPUT_PASS_TO_HANDLERS 1
162#define INPUT_PASS_TO_DEVICE 2
163#define INPUT_PASS_TO_ALL (INPUT_PASS_TO_HANDLERS | INPUT_PASS_TO_DEVICE)
164
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700165static int input_handle_abs_event(struct input_dev *dev,
166 unsigned int code, int *pval)
167{
168 bool is_mt_event;
169 int *pold;
170
171 if (code == ABS_MT_SLOT) {
172 /*
173 * "Stage" the event; we'll flush it later, when we
174 * get actiual touch data.
175 */
176 if (*pval >= 0 && *pval < dev->mtsize)
177 dev->slot = *pval;
178
179 return INPUT_IGNORE_EVENT;
180 }
181
182 is_mt_event = code >= ABS_MT_FIRST && code <= ABS_MT_LAST;
183
184 if (!is_mt_event) {
Daniel Mackd31b2862010-08-02 20:18:21 -0700185 pold = &dev->absinfo[code].value;
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700186 } else if (dev->mt) {
187 struct input_mt_slot *mtslot = &dev->mt[dev->slot];
188 pold = &mtslot->abs[code - ABS_MT_FIRST];
189 } else {
190 /*
191 * Bypass filtering for multitouch events when
192 * not employing slots.
193 */
194 pold = NULL;
195 }
196
197 if (pold) {
198 *pval = input_defuzz_abs_event(*pval, *pold,
Daniel Mackd31b2862010-08-02 20:18:21 -0700199 dev->absinfo[code].fuzz);
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700200 if (*pold == *pval)
201 return INPUT_IGNORE_EVENT;
202
203 *pold = *pval;
204 }
205
206 /* Flush pending "slot" event */
Daniel Mack987a6c02010-08-02 20:15:17 -0700207 if (is_mt_event && dev->slot != input_abs_get_val(dev, ABS_MT_SLOT)) {
208 input_abs_set_val(dev, ABS_MT_SLOT, dev->slot);
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700209 input_pass_event(dev, EV_ABS, ABS_MT_SLOT, dev->slot);
210 }
211
212 return INPUT_PASS_TO_HANDLERS;
213}
214
Dmitry Torokhov80064792007-08-30 00:22:11 -0400215static void input_handle_event(struct input_dev *dev,
216 unsigned int type, unsigned int code, int value)
217{
218 int disposition = INPUT_IGNORE_EVENT;
219
220 switch (type) {
221
222 case EV_SYN:
223 switch (code) {
224 case SYN_CONFIG:
225 disposition = INPUT_PASS_TO_ALL;
226 break;
227
228 case SYN_REPORT:
229 if (!dev->sync) {
Dmitry Torokhov20da92d2010-07-15 23:27:36 -0700230 dev->sync = true;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400231 disposition = INPUT_PASS_TO_HANDLERS;
232 }
233 break;
Henrik Rydberg5e5ee682009-04-28 07:47:33 -0700234 case SYN_MT_REPORT:
Dmitry Torokhov20da92d2010-07-15 23:27:36 -0700235 dev->sync = false;
Henrik Rydberg5e5ee682009-04-28 07:47:33 -0700236 disposition = INPUT_PASS_TO_HANDLERS;
237 break;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400238 }
239 break;
240
241 case EV_KEY:
242 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
243 !!test_bit(code, dev->key) != value) {
244
245 if (value != 2) {
246 __change_bit(code, dev->key);
247 if (value)
248 input_start_autorepeat(dev, code);
Johannes Berge7b5c1e2009-01-29 23:17:52 -0800249 else
250 input_stop_autorepeat(dev);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400251 }
252
253 disposition = INPUT_PASS_TO_HANDLERS;
254 }
255 break;
256
257 case EV_SW:
258 if (is_event_supported(code, dev->swbit, SW_MAX) &&
259 !!test_bit(code, dev->sw) != value) {
260
261 __change_bit(code, dev->sw);
262 disposition = INPUT_PASS_TO_HANDLERS;
263 }
264 break;
265
266 case EV_ABS:
Henrik Rydberg40d007e2010-07-15 23:10:10 -0700267 if (is_event_supported(code, dev->absbit, ABS_MAX))
268 disposition = input_handle_abs_event(dev, code, &value);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400269
Dmitry Torokhov80064792007-08-30 00:22:11 -0400270 break;
271
272 case EV_REL:
273 if (is_event_supported(code, dev->relbit, REL_MAX) && value)
274 disposition = INPUT_PASS_TO_HANDLERS;
275
276 break;
277
278 case EV_MSC:
279 if (is_event_supported(code, dev->mscbit, MSC_MAX))
280 disposition = INPUT_PASS_TO_ALL;
281
282 break;
283
284 case EV_LED:
285 if (is_event_supported(code, dev->ledbit, LED_MAX) &&
286 !!test_bit(code, dev->led) != value) {
287
288 __change_bit(code, dev->led);
289 disposition = INPUT_PASS_TO_ALL;
290 }
291 break;
292
293 case EV_SND:
294 if (is_event_supported(code, dev->sndbit, SND_MAX)) {
295
296 if (!!test_bit(code, dev->snd) != !!value)
297 __change_bit(code, dev->snd);
298 disposition = INPUT_PASS_TO_ALL;
299 }
300 break;
301
302 case EV_REP:
303 if (code <= REP_MAX && value >= 0 && dev->rep[code] != value) {
304 dev->rep[code] = value;
305 disposition = INPUT_PASS_TO_ALL;
306 }
307 break;
308
309 case EV_FF:
310 if (value >= 0)
311 disposition = INPUT_PASS_TO_ALL;
312 break;
Richard Purdieed2fa4d2008-01-03 10:46:21 -0500313
314 case EV_PWR:
315 disposition = INPUT_PASS_TO_ALL;
316 break;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400317 }
318
Dmitry Torokhovc9812282008-06-02 01:02:40 -0400319 if (disposition != INPUT_IGNORE_EVENT && type != EV_SYN)
Dmitry Torokhov20da92d2010-07-15 23:27:36 -0700320 dev->sync = false;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400321
322 if ((disposition & INPUT_PASS_TO_DEVICE) && dev->event)
323 dev->event(dev, type, code, value);
324
325 if (disposition & INPUT_PASS_TO_HANDLERS)
326 input_pass_event(dev, type, code, value);
327}
328
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400329/**
330 * input_event() - report new input event
Dmitry Torokhov14471902006-11-02 23:26:55 -0500331 * @dev: device that generated the event
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400332 * @type: type of the event
333 * @code: event code
334 * @value: value of the event
335 *
Dmitry Torokhov80064792007-08-30 00:22:11 -0400336 * This function should be used by drivers implementing various input
Dmitry Torokhovdf2d4632009-12-11 21:57:31 -0800337 * devices to report input events. See also input_inject_event().
338 *
339 * NOTE: input_event() may be safely used right after input device was
340 * allocated with input_allocate_device(), even before it is registered
341 * with input_register_device(), but the event will not reach any of the
342 * input handlers. Such early invocation of input_event() may be used
343 * to 'seed' initial state of a switch or initial position of absolute
344 * axis, etc.
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400345 */
Dmitry Torokhov80064792007-08-30 00:22:11 -0400346void input_event(struct input_dev *dev,
347 unsigned int type, unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400349 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Dmitry Torokhov80064792007-08-30 00:22:11 -0400351 if (is_event_supported(type, dev->evbit, EV_MAX)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
Dmitry Torokhov80064792007-08-30 00:22:11 -0400353 spin_lock_irqsave(&dev->event_lock, flags);
354 add_input_randomness(type, code, value);
355 input_handle_event(dev, type, code, value);
356 spin_unlock_irqrestore(&dev->event_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400359EXPORT_SYMBOL(input_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400361/**
362 * input_inject_event() - send input event from input handler
363 * @handle: input handle to send event through
364 * @type: type of the event
365 * @code: event code
366 * @value: value of the event
367 *
Dmitry Torokhov80064792007-08-30 00:22:11 -0400368 * Similar to input_event() but will ignore event if device is
369 * "grabbed" and handle injecting event is not the one that owns
370 * the device.
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400371 */
Dmitry Torokhov80064792007-08-30 00:22:11 -0400372void input_inject_event(struct input_handle *handle,
373 unsigned int type, unsigned int code, int value)
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400374{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400375 struct input_dev *dev = handle->dev;
376 struct input_handle *grab;
377 unsigned long flags;
378
379 if (is_event_supported(type, dev->evbit, EV_MAX)) {
380 spin_lock_irqsave(&dev->event_lock, flags);
381
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400382 rcu_read_lock();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400383 grab = rcu_dereference(dev->grab);
384 if (!grab || grab == handle)
385 input_handle_event(dev, type, code, value);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400386 rcu_read_unlock();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400387
388 spin_unlock_irqrestore(&dev->event_lock, flags);
389 }
Dmitry Torokhov0e739d22006-07-06 00:22:43 -0400390}
391EXPORT_SYMBOL(input_inject_event);
392
Dmitry Torokhov80064792007-08-30 00:22:11 -0400393/**
Daniel Mackd31b2862010-08-02 20:18:21 -0700394 * input_alloc_absinfo - allocates array of input_absinfo structs
395 * @dev: the input device emitting absolute events
396 *
397 * If the absinfo struct the caller asked for is already allocated, this
398 * functions will not do anything.
399 */
400void input_alloc_absinfo(struct input_dev *dev)
401{
402 if (!dev->absinfo)
403 dev->absinfo = kcalloc(ABS_CNT, sizeof(struct input_absinfo),
404 GFP_KERNEL);
405
406 WARN(!dev->absinfo, "%s(): kcalloc() failed?\n", __func__);
407}
408EXPORT_SYMBOL(input_alloc_absinfo);
409
410void input_set_abs_params(struct input_dev *dev, unsigned int axis,
411 int min, int max, int fuzz, int flat)
412{
413 struct input_absinfo *absinfo;
414
415 input_alloc_absinfo(dev);
416 if (!dev->absinfo)
417 return;
418
419 absinfo = &dev->absinfo[axis];
420 absinfo->minimum = min;
421 absinfo->maximum = max;
422 absinfo->fuzz = fuzz;
423 absinfo->flat = flat;
424
425 dev->absbit[BIT_WORD(axis)] |= BIT_MASK(axis);
426}
427EXPORT_SYMBOL(input_set_abs_params);
428
429
430/**
Dmitry Torokhov80064792007-08-30 00:22:11 -0400431 * input_grab_device - grabs device for exclusive use
432 * @handle: input handle that wants to own the device
433 *
434 * When a device is grabbed by an input handle all events generated by
435 * the device are delivered only to this handle. Also events injected
436 * by other input handles are ignored while device is grabbed.
437 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438int input_grab_device(struct input_handle *handle)
439{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400440 struct input_dev *dev = handle->dev;
441 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Dmitry Torokhov80064792007-08-30 00:22:11 -0400443 retval = mutex_lock_interruptible(&dev->mutex);
444 if (retval)
445 return retval;
446
447 if (dev->grab) {
448 retval = -EBUSY;
449 goto out;
450 }
451
452 rcu_assign_pointer(dev->grab, handle);
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400453 synchronize_rcu();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400454
455 out:
456 mutex_unlock(&dev->mutex);
457 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400459EXPORT_SYMBOL(input_grab_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
Dmitry Torokhov80064792007-08-30 00:22:11 -0400461static void __input_release_device(struct input_handle *handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
Andrew Mortona2b2ed22006-07-15 01:17:38 -0400463 struct input_dev *dev = handle->dev;
Dmitry Torokhovc7e8dc62006-07-06 00:21:03 -0400464
Andrew Mortona2b2ed22006-07-15 01:17:38 -0400465 if (dev->grab == handle) {
Dmitry Torokhov80064792007-08-30 00:22:11 -0400466 rcu_assign_pointer(dev->grab, NULL);
467 /* Make sure input_pass_event() notices that grab is gone */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400468 synchronize_rcu();
Andrew Mortona2b2ed22006-07-15 01:17:38 -0400469
470 list_for_each_entry(handle, &dev->h_list, d_node)
Dmitry Torokhov80064792007-08-30 00:22:11 -0400471 if (handle->open && handle->handler->start)
Dmitry Torokhovc7e8dc62006-07-06 00:21:03 -0400472 handle->handler->start(handle);
473 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474}
Dmitry Torokhov80064792007-08-30 00:22:11 -0400475
476/**
477 * input_release_device - release previously grabbed device
478 * @handle: input handle that owns the device
479 *
480 * Releases previously grabbed device so that other input handles can
481 * start receiving input events. Upon release all handlers attached
482 * to the device have their start() method called so they have a change
483 * to synchronize device state with the rest of the system.
484 */
485void input_release_device(struct input_handle *handle)
486{
487 struct input_dev *dev = handle->dev;
488
489 mutex_lock(&dev->mutex);
490 __input_release_device(handle);
491 mutex_unlock(&dev->mutex);
492}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400493EXPORT_SYMBOL(input_release_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Dmitry Torokhov80064792007-08-30 00:22:11 -0400495/**
496 * input_open_device - open input device
497 * @handle: handle through which device is being accessed
498 *
499 * This function should be called by input handlers when they
500 * want to start receive events from given input device.
501 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502int input_open_device(struct input_handle *handle)
503{
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500504 struct input_dev *dev = handle->dev;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400505 int retval;
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500506
Dmitry Torokhov80064792007-08-30 00:22:11 -0400507 retval = mutex_lock_interruptible(&dev->mutex);
508 if (retval)
509 return retval;
510
511 if (dev->going_away) {
512 retval = -ENODEV;
513 goto out;
514 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500515
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 handle->open++;
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500517
518 if (!dev->users++ && dev->open)
Dmitry Torokhov80064792007-08-30 00:22:11 -0400519 retval = dev->open(dev);
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500520
Dmitry Torokhov80064792007-08-30 00:22:11 -0400521 if (retval) {
522 dev->users--;
523 if (!--handle->open) {
524 /*
525 * Make sure we are not delivering any more events
526 * through this handle
527 */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400528 synchronize_rcu();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400529 }
530 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500531
Dmitry Torokhov80064792007-08-30 00:22:11 -0400532 out:
Jes Sorensene676c232006-02-19 00:21:46 -0500533 mutex_unlock(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400534 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400536EXPORT_SYMBOL(input_open_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Dmitry Torokhov80064792007-08-30 00:22:11 -0400538int input_flush_device(struct input_handle *handle, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539{
Dmitry Torokhov80064792007-08-30 00:22:11 -0400540 struct input_dev *dev = handle->dev;
541 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Dmitry Torokhov80064792007-08-30 00:22:11 -0400543 retval = mutex_lock_interruptible(&dev->mutex);
544 if (retval)
545 return retval;
546
547 if (dev->flush)
548 retval = dev->flush(dev, file);
549
550 mutex_unlock(&dev->mutex);
551 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400553EXPORT_SYMBOL(input_flush_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Dmitry Torokhov80064792007-08-30 00:22:11 -0400555/**
556 * input_close_device - close input device
557 * @handle: handle through which device is being accessed
558 *
559 * This function should be called by input handlers when they
560 * want to stop receive events from given input device.
561 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562void input_close_device(struct input_handle *handle)
563{
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500564 struct input_dev *dev = handle->dev;
565
Jes Sorensene676c232006-02-19 00:21:46 -0500566 mutex_lock(&dev->mutex);
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500567
Dmitry Torokhov80064792007-08-30 00:22:11 -0400568 __input_release_device(handle);
569
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500570 if (!--dev->users && dev->close)
571 dev->close(dev);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400572
573 if (!--handle->open) {
574 /*
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400575 * synchronize_rcu() makes sure that input_pass_event()
Dmitry Torokhov80064792007-08-30 00:22:11 -0400576 * completed and that no more input events are delivered
577 * through this handle
578 */
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -0400579 synchronize_rcu();
Dmitry Torokhov80064792007-08-30 00:22:11 -0400580 }
Dmitry Torokhov0fbf87c2005-05-29 02:29:25 -0500581
Jes Sorensene676c232006-02-19 00:21:46 -0500582 mutex_unlock(&dev->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -0400584EXPORT_SYMBOL(input_close_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
Dmitry Torokhov80064792007-08-30 00:22:11 -0400586/*
Oliver Neukum866d7d72010-07-01 09:01:50 -0700587 * Simulate keyup events for all keys that are marked as pressed.
588 * The function must be called with dev->event_lock held.
589 */
590static void input_dev_release_keys(struct input_dev *dev)
591{
592 int code;
593
594 if (is_event_supported(EV_KEY, dev->evbit, EV_MAX)) {
595 for (code = 0; code <= KEY_MAX; code++) {
596 if (is_event_supported(code, dev->keybit, KEY_MAX) &&
597 __test_and_clear_bit(code, dev->key)) {
598 input_pass_event(dev, EV_KEY, code, 0);
599 }
600 }
601 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
602 }
603}
604
605/*
Dmitry Torokhov80064792007-08-30 00:22:11 -0400606 * Prepare device for unregistering
607 */
608static void input_disconnect_device(struct input_dev *dev)
609{
610 struct input_handle *handle;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400611
612 /*
613 * Mark device as going away. Note that we take dev->mutex here
614 * not to protect access to dev->going_away but rather to ensure
615 * that there are no threads in the middle of input_open_device()
616 */
617 mutex_lock(&dev->mutex);
Dmitry Torokhovffd0db92009-09-16 01:06:43 -0700618 dev->going_away = true;
Dmitry Torokhov80064792007-08-30 00:22:11 -0400619 mutex_unlock(&dev->mutex);
620
621 spin_lock_irq(&dev->event_lock);
622
623 /*
624 * Simulate keyup events for all pressed keys so that handlers
625 * are not left with "stuck" keys. The driver may continue
626 * generate events even after we done here but they will not
627 * reach any handlers.
628 */
Oliver Neukum866d7d72010-07-01 09:01:50 -0700629 input_dev_release_keys(dev);
Dmitry Torokhov80064792007-08-30 00:22:11 -0400630
631 list_for_each_entry(handle, &dev->h_list, d_node)
632 handle->open = 0;
633
634 spin_unlock_irq(&dev->event_lock);
635}
636
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400637static int input_fetch_keycode(struct input_dev *dev, int scancode)
638{
639 switch (dev->keycodesize) {
640 case 1:
641 return ((u8 *)dev->keycode)[scancode];
642
643 case 2:
644 return ((u16 *)dev->keycode)[scancode];
645
646 default:
647 return ((u32 *)dev->keycode)[scancode];
648 }
649}
650
651static int input_default_getkeycode(struct input_dev *dev,
Dmitry Torokhov58b93992010-03-08 22:37:10 -0800652 unsigned int scancode,
653 unsigned int *keycode)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400654{
655 if (!dev->keycodesize)
656 return -EINVAL;
657
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400658 if (scancode >= dev->keycodemax)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400659 return -EINVAL;
660
661 *keycode = input_fetch_keycode(dev, scancode);
662
663 return 0;
664}
665
666static int input_default_setkeycode(struct input_dev *dev,
Dmitry Torokhov58b93992010-03-08 22:37:10 -0800667 unsigned int scancode,
668 unsigned int keycode)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400669{
670 int old_keycode;
671 int i;
672
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400673 if (scancode >= dev->keycodemax)
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400674 return -EINVAL;
675
676 if (!dev->keycodesize)
677 return -EINVAL;
678
679 if (dev->keycodesize < sizeof(keycode) && (keycode >> (dev->keycodesize * 8)))
680 return -EINVAL;
681
682 switch (dev->keycodesize) {
683 case 1: {
684 u8 *k = (u8 *)dev->keycode;
685 old_keycode = k[scancode];
686 k[scancode] = keycode;
687 break;
688 }
689 case 2: {
690 u16 *k = (u16 *)dev->keycode;
691 old_keycode = k[scancode];
692 k[scancode] = keycode;
693 break;
694 }
695 default: {
696 u32 *k = (u32 *)dev->keycode;
697 old_keycode = k[scancode];
698 k[scancode] = keycode;
699 break;
700 }
701 }
702
Dmitry Torokhov4f93df42010-01-05 17:56:00 -0800703 __clear_bit(old_keycode, dev->keybit);
704 __set_bit(keycode, dev->keybit);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400705
706 for (i = 0; i < dev->keycodemax; i++) {
707 if (input_fetch_keycode(dev, i) == old_keycode) {
Dmitry Torokhov4f93df42010-01-05 17:56:00 -0800708 __set_bit(old_keycode, dev->keybit);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400709 break; /* Setting the bit twice is useless, so break */
710 }
711 }
712
713 return 0;
714}
715
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400716/**
717 * input_get_keycode - retrieve keycode currently mapped to a given scancode
718 * @dev: input device which keymap is being queried
719 * @scancode: scancode (or its equivalent for device in question) for which
720 * keycode is needed
721 * @keycode: result
722 *
723 * This function should be called by anyone interested in retrieving current
724 * keymap. Presently keyboard and evdev handlers use it.
725 */
Dmitry Torokhov58b93992010-03-08 22:37:10 -0800726int input_get_keycode(struct input_dev *dev,
727 unsigned int scancode, unsigned int *keycode)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400728{
Dmitry Torokhov2e2e3b92010-03-21 22:56:15 -0700729 unsigned long flags;
730 int retval;
731
732 spin_lock_irqsave(&dev->event_lock, flags);
733 retval = dev->getkeycode(dev, scancode, keycode);
734 spin_unlock_irqrestore(&dev->event_lock, flags);
735
736 return retval;
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400737}
738EXPORT_SYMBOL(input_get_keycode);
739
740/**
741 * input_get_keycode - assign new keycode to a given scancode
742 * @dev: input device which keymap is being updated
743 * @scancode: scancode (or its equivalent for device in question)
744 * @keycode: new keycode to be assigned to the scancode
745 *
746 * This function should be called by anyone needing to update current
747 * keymap. Presently keyboard and evdev handlers use it.
748 */
Dmitry Torokhov58b93992010-03-08 22:37:10 -0800749int input_set_keycode(struct input_dev *dev,
750 unsigned int scancode, unsigned int keycode)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400751{
752 unsigned long flags;
Dmitry Torokhovfd6cf3d2010-07-14 00:25:21 -0700753 unsigned int old_keycode;
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400754 int retval;
755
Dmitry Torokhov58b93992010-03-08 22:37:10 -0800756 if (keycode > KEY_MAX)
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400757 return -EINVAL;
758
759 spin_lock_irqsave(&dev->event_lock, flags);
760
761 retval = dev->getkeycode(dev, scancode, &old_keycode);
762 if (retval)
763 goto out;
764
765 retval = dev->setkeycode(dev, scancode, keycode);
766 if (retval)
767 goto out;
768
Dmitry Torokhov4f93df42010-01-05 17:56:00 -0800769 /* Make sure KEY_RESERVED did not get enabled. */
770 __clear_bit(KEY_RESERVED, dev->keybit);
771
Dmitry Torokhovf4f37c82007-11-04 00:41:12 -0400772 /*
773 * Simulate keyup event if keycode is not present
774 * in the keymap anymore
775 */
776 if (test_bit(EV_KEY, dev->evbit) &&
777 !is_event_supported(old_keycode, dev->keybit, KEY_MAX) &&
778 __test_and_clear_bit(old_keycode, dev->key)) {
779
780 input_pass_event(dev, EV_KEY, old_keycode, 0);
781 if (dev->sync)
782 input_pass_event(dev, EV_SYN, SYN_REPORT, 1);
783 }
784
785 out:
786 spin_unlock_irqrestore(&dev->event_lock, flags);
787
788 return retval;
789}
790EXPORT_SYMBOL(input_set_keycode);
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -0400791
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792#define MATCH_BIT(bit, max) \
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700793 for (i = 0; i < BITS_TO_LONGS(max); i++) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 if ((id->bit[i] & dev->bit[i]) != id->bit[i]) \
795 break; \
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700796 if (i != BITS_TO_LONGS(max)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 continue;
798
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800799static const struct input_device_id *input_match_device(struct input_handler *handler,
Dmitry Torokhov66e66112006-09-14 01:31:59 -0400800 struct input_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801{
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800802 const struct input_device_id *id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 int i;
804
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800805 for (id = handler->id_table; id->flags || id->driver_info; id++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806
807 if (id->flags & INPUT_DEVICE_ID_MATCH_BUS)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400808 if (id->bustype != dev->id.bustype)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 continue;
810
811 if (id->flags & INPUT_DEVICE_ID_MATCH_VENDOR)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400812 if (id->vendor != dev->id.vendor)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 continue;
814
815 if (id->flags & INPUT_DEVICE_ID_MATCH_PRODUCT)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400816 if (id->product != dev->id.product)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 continue;
818
819 if (id->flags & INPUT_DEVICE_ID_MATCH_VERSION)
Dmitry Torokhovddc5d342006-04-26 00:14:19 -0400820 if (id->version != dev->id.version)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 continue;
822
823 MATCH_BIT(evbit, EV_MAX);
824 MATCH_BIT(keybit, KEY_MAX);
825 MATCH_BIT(relbit, REL_MAX);
826 MATCH_BIT(absbit, ABS_MAX);
827 MATCH_BIT(mscbit, MSC_MAX);
828 MATCH_BIT(ledbit, LED_MAX);
829 MATCH_BIT(sndbit, SND_MAX);
830 MATCH_BIT(ffbit, FF_MAX);
Dmitry Torokhovff13f982005-09-24 02:02:29 -0500831 MATCH_BIT(swbit, SW_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800833 if (!handler->match || handler->match(handler, dev))
834 return id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 }
836
837 return NULL;
838}
839
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400840static int input_attach_handler(struct input_dev *dev, struct input_handler *handler)
841{
842 const struct input_device_id *id;
843 int error;
844
Dmitry Torokhov0b7024ac2010-02-02 21:08:26 -0800845 id = input_match_device(handler, dev);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400846 if (!id)
847 return -ENODEV;
848
849 error = handler->connect(handler, dev, id);
850 if (error && error != -ENODEV)
851 printk(KERN_ERR
852 "input: failed to attach handler %s to device %s, "
853 "error: %d\n",
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400854 handler->name, kobject_name(&dev->dev.kobj), error);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400855
856 return error;
857}
858
Dmitry Torokhov15e184a2010-01-11 00:05:43 -0800859#ifdef CONFIG_COMPAT
860
861static int input_bits_to_string(char *buf, int buf_size,
862 unsigned long bits, bool skip_empty)
863{
864 int len = 0;
865
866 if (INPUT_COMPAT_TEST) {
867 u32 dword = bits >> 32;
868 if (dword || !skip_empty)
869 len += snprintf(buf, buf_size, "%x ", dword);
870
871 dword = bits & 0xffffffffUL;
872 if (dword || !skip_empty || len)
873 len += snprintf(buf + len, max(buf_size - len, 0),
874 "%x", dword);
875 } else {
876 if (bits || !skip_empty)
877 len += snprintf(buf, buf_size, "%lx", bits);
878 }
879
880 return len;
881}
882
883#else /* !CONFIG_COMPAT */
884
885static int input_bits_to_string(char *buf, int buf_size,
886 unsigned long bits, bool skip_empty)
887{
888 return bits || !skip_empty ?
889 snprintf(buf, buf_size, "%lx", bits) : 0;
890}
891
892#endif
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -0400893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894#ifdef CONFIG_PROC_FS
Dmitry Torokhovf96b4342005-06-30 00:50:29 -0500895
896static struct proc_dir_entry *proc_bus_input_dir;
897static DECLARE_WAIT_QUEUE_HEAD(input_devices_poll_wait);
898static int input_devices_state;
899
900static inline void input_wakeup_procfs_readers(void)
901{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 input_devices_state++;
903 wake_up(&input_devices_poll_wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904}
905
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500906static unsigned int input_proc_devices_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -0500908 poll_wait(file, &input_devices_poll_wait, wait);
Dmitry Torokhovfa886612009-03-04 00:52:20 -0800909 if (file->f_version != input_devices_state) {
910 file->f_version = input_devices_state;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -0500911 return POLLIN | POLLRDNORM;
Dmitry Torokhovfa886612009-03-04 00:52:20 -0800912 }
Dmitry Torokhov1e0afb22006-06-26 01:48:47 -0400913
Dmitry Torokhovf96b4342005-06-30 00:50:29 -0500914 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915}
916
Dmitry Torokhov1572ca22009-10-13 23:37:30 -0700917union input_seq_state {
918 struct {
919 unsigned short pos;
920 bool mutex_acquired;
921 };
922 void *p;
923};
924
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500925static void *input_devices_seq_start(struct seq_file *seq, loff_t *pos)
926{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -0700927 union input_seq_state *state = (union input_seq_state *)&seq->private;
928 int error;
929
930 /* We need to fit into seq->private pointer */
931 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
932
933 error = mutex_lock_interruptible(&input_mutex);
934 if (error) {
935 state->mutex_acquired = false;
936 return ERR_PTR(error);
937 }
938
939 state->mutex_acquired = true;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500940
Pavel Emelianovad5d9722007-07-18 00:38:32 -0400941 return seq_list_start(&input_dev_list, *pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500942}
943
944static void *input_devices_seq_next(struct seq_file *seq, void *v, loff_t *pos)
945{
Pavel Emelianovad5d9722007-07-18 00:38:32 -0400946 return seq_list_next(v, &input_dev_list, pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500947}
948
Dmitry Torokhov1572ca22009-10-13 23:37:30 -0700949static void input_seq_stop(struct seq_file *seq, void *v)
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500950{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -0700951 union input_seq_state *state = (union input_seq_state *)&seq->private;
952
953 if (state->mutex_acquired)
954 mutex_unlock(&input_mutex);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500955}
956
957static void input_seq_print_bitmap(struct seq_file *seq, const char *name,
958 unsigned long *bitmap, int max)
959{
960 int i;
Dmitry Torokhov15e184a2010-01-11 00:05:43 -0800961 bool skip_empty = true;
962 char buf[18];
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500963
964 seq_printf(seq, "B: %s=", name);
Dmitry Torokhov15e184a2010-01-11 00:05:43 -0800965
966 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
967 if (input_bits_to_string(buf, sizeof(buf),
968 bitmap[i], skip_empty)) {
969 skip_empty = false;
970 seq_printf(seq, "%s%s", buf, i > 0 ? " " : "");
971 }
972 }
973
974 /*
975 * If no output was produced print a single 0.
976 */
977 if (skip_empty)
978 seq_puts(seq, "0");
979
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500980 seq_putc(seq, '\n');
981}
982
983static int input_devices_seq_show(struct seq_file *seq, void *v)
984{
985 struct input_dev *dev = container_of(v, struct input_dev, node);
Dmitry Torokhov9657d752007-06-14 23:32:24 -0400986 const char *path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 struct input_handle *handle;
988
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500989 seq_printf(seq, "I: Bus=%04x Vendor=%04x Product=%04x Version=%04x\n",
990 dev->id.bustype, dev->id.vendor, dev->id.product, dev->id.version);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500992 seq_printf(seq, "N: Name=\"%s\"\n", dev->name ? dev->name : "");
993 seq_printf(seq, "P: Phys=%s\n", dev->phys ? dev->phys : "");
994 seq_printf(seq, "S: Sysfs=%s\n", path ? path : "");
Dmitry Torokhov15e03ae2007-03-07 23:20:17 -0500995 seq_printf(seq, "U: Uniq=%s\n", dev->uniq ? dev->uniq : "");
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500996 seq_printf(seq, "H: Handlers=");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
Dmitry Torokhov969b21c2006-04-02 00:09:34 -0500998 list_for_each_entry(handle, &dev->h_list, d_node)
999 seq_printf(seq, "%s ", handle->name);
1000 seq_putc(seq, '\n');
Dmitry Torokhov051b2fe2005-09-15 02:01:54 -05001001
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001002 input_seq_print_bitmap(seq, "EV", dev->evbit, EV_MAX);
1003 if (test_bit(EV_KEY, dev->evbit))
1004 input_seq_print_bitmap(seq, "KEY", dev->keybit, KEY_MAX);
1005 if (test_bit(EV_REL, dev->evbit))
1006 input_seq_print_bitmap(seq, "REL", dev->relbit, REL_MAX);
1007 if (test_bit(EV_ABS, dev->evbit))
1008 input_seq_print_bitmap(seq, "ABS", dev->absbit, ABS_MAX);
1009 if (test_bit(EV_MSC, dev->evbit))
1010 input_seq_print_bitmap(seq, "MSC", dev->mscbit, MSC_MAX);
1011 if (test_bit(EV_LED, dev->evbit))
1012 input_seq_print_bitmap(seq, "LED", dev->ledbit, LED_MAX);
1013 if (test_bit(EV_SND, dev->evbit))
1014 input_seq_print_bitmap(seq, "SND", dev->sndbit, SND_MAX);
1015 if (test_bit(EV_FF, dev->evbit))
1016 input_seq_print_bitmap(seq, "FF", dev->ffbit, FF_MAX);
1017 if (test_bit(EV_SW, dev->evbit))
1018 input_seq_print_bitmap(seq, "SW", dev->swbit, SW_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001020 seq_putc(seq, '\n');
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001022 kfree(path);
1023 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024}
1025
Jan Engelhardtcec69c32008-01-31 00:43:32 -05001026static const struct seq_operations input_devices_seq_ops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001027 .start = input_devices_seq_start,
1028 .next = input_devices_seq_next,
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001029 .stop = input_seq_stop,
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001030 .show = input_devices_seq_show,
1031};
1032
1033static int input_proc_devices_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034{
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001035 return seq_open(file, &input_devices_seq_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036}
1037
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08001038static const struct file_operations input_devices_fileops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001039 .owner = THIS_MODULE,
1040 .open = input_proc_devices_open,
1041 .poll = input_proc_devices_poll,
1042 .read = seq_read,
1043 .llseek = seq_lseek,
1044 .release = seq_release,
1045};
1046
1047static void *input_handlers_seq_start(struct seq_file *seq, loff_t *pos)
1048{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001049 union input_seq_state *state = (union input_seq_state *)&seq->private;
1050 int error;
Dmitry Torokhov80064792007-08-30 00:22:11 -04001051
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001052 /* We need to fit into seq->private pointer */
1053 BUILD_BUG_ON(sizeof(union input_seq_state) != sizeof(seq->private));
1054
1055 error = mutex_lock_interruptible(&input_mutex);
1056 if (error) {
1057 state->mutex_acquired = false;
1058 return ERR_PTR(error);
1059 }
1060
1061 state->mutex_acquired = true;
1062 state->pos = *pos;
1063
Pavel Emelianovad5d9722007-07-18 00:38:32 -04001064 return seq_list_start(&input_handler_list, *pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001065}
1066
1067static void *input_handlers_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1068{
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001069 union input_seq_state *state = (union input_seq_state *)&seq->private;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001070
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001071 state->pos = *pos + 1;
1072 return seq_list_next(v, &input_handler_list, pos);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001073}
1074
1075static int input_handlers_seq_show(struct seq_file *seq, void *v)
1076{
1077 struct input_handler *handler = container_of(v, struct input_handler, node);
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001078 union input_seq_state *state = (union input_seq_state *)&seq->private;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001079
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001080 seq_printf(seq, "N: Number=%u Name=%s", state->pos, handler->name);
Dmitry Torokhovef7995f2010-01-29 23:59:12 -08001081 if (handler->filter)
1082 seq_puts(seq, " (filter)");
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001083 if (handler->fops)
1084 seq_printf(seq, " Minor=%d", handler->minor);
1085 seq_putc(seq, '\n');
1086
1087 return 0;
1088}
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001089
Jan Engelhardtcec69c32008-01-31 00:43:32 -05001090static const struct seq_operations input_handlers_seq_ops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001091 .start = input_handlers_seq_start,
1092 .next = input_handlers_seq_next,
Dmitry Torokhov1572ca22009-10-13 23:37:30 -07001093 .stop = input_seq_stop,
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001094 .show = input_handlers_seq_show,
1095};
1096
1097static int input_proc_handlers_open(struct inode *inode, struct file *file)
1098{
1099 return seq_open(file, &input_handlers_seq_ops);
1100}
1101
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08001102static const struct file_operations input_handlers_fileops = {
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001103 .owner = THIS_MODULE,
1104 .open = input_proc_handlers_open,
1105 .read = seq_read,
1106 .llseek = seq_lseek,
1107 .release = seq_release,
1108};
Luke Kosewskie334016fc2005-06-01 02:39:28 -05001109
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110static int __init input_proc_init(void)
1111{
1112 struct proc_dir_entry *entry;
1113
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001114 proc_bus_input_dir = proc_mkdir("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001115 if (!proc_bus_input_dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 return -ENOMEM;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001117
Denis V. Lunevc7705f32008-04-29 01:02:35 -07001118 entry = proc_create("devices", 0, proc_bus_input_dir,
1119 &input_devices_fileops);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001120 if (!entry)
1121 goto fail1;
1122
Denis V. Lunevc7705f32008-04-29 01:02:35 -07001123 entry = proc_create("handlers", 0, proc_bus_input_dir,
1124 &input_handlers_fileops);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001125 if (!entry)
1126 goto fail2;
1127
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 return 0;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001129
1130 fail2: remove_proc_entry("devices", proc_bus_input_dir);
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001131 fail1: remove_proc_entry("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001132 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133}
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001134
Andrew Mortonbeffbdc2005-07-01 23:54:30 -05001135static void input_proc_exit(void)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001136{
1137 remove_proc_entry("devices", proc_bus_input_dir);
1138 remove_proc_entry("handlers", proc_bus_input_dir);
Alexey Dobriyan9c370662008-04-29 01:01:41 -07001139 remove_proc_entry("bus/input", NULL);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001140}
1141
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142#else /* !CONFIG_PROC_FS */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001143static inline void input_wakeup_procfs_readers(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144static inline int input_proc_init(void) { return 0; }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001145static inline void input_proc_exit(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146#endif
1147
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001148#define INPUT_DEV_STRING_ATTR_SHOW(name) \
1149static ssize_t input_dev_show_##name(struct device *dev, \
1150 struct device_attribute *attr, \
1151 char *buf) \
1152{ \
1153 struct input_dev *input_dev = to_input_dev(dev); \
1154 \
1155 return scnprintf(buf, PAGE_SIZE, "%s\n", \
1156 input_dev->name ? input_dev->name : ""); \
1157} \
1158static DEVICE_ATTR(name, S_IRUGO, input_dev_show_##name, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001159
1160INPUT_DEV_STRING_ATTR_SHOW(name);
1161INPUT_DEV_STRING_ATTR_SHOW(phys);
1162INPUT_DEV_STRING_ATTR_SHOW(uniq);
1163
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001164static int input_print_modalias_bits(char *buf, int size,
1165 char name, unsigned long *bm,
1166 unsigned int min_bit, unsigned int max_bit)
Rusty Russell1d8f4302005-12-07 21:40:34 +01001167{
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001168 int len = 0, i;
Rusty Russell1d8f4302005-12-07 21:40:34 +01001169
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001170 len += snprintf(buf, max(size, 0), "%c", name);
1171 for (i = min_bit; i < max_bit; i++)
Jiri Slaby7b19ada2007-10-18 23:40:32 -07001172 if (bm[BIT_WORD(i)] & BIT_MASK(i))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001173 len += snprintf(buf + len, max(size - len, 0), "%X,", i);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001174 return len;
1175}
1176
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001177static int input_print_modalias(char *buf, int size, struct input_dev *id,
1178 int add_cr)
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001179{
1180 int len;
1181
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001182 len = snprintf(buf, max(size, 0),
1183 "input:b%04Xv%04Xp%04Xe%04X-",
1184 id->id.bustype, id->id.vendor,
1185 id->id.product, id->id.version);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001186
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001187 len += input_print_modalias_bits(buf + len, size - len,
1188 'e', id->evbit, 0, EV_MAX);
1189 len += input_print_modalias_bits(buf + len, size - len,
1190 'k', id->keybit, KEY_MIN_INTERESTING, KEY_MAX);
1191 len += input_print_modalias_bits(buf + len, size - len,
1192 'r', id->relbit, 0, REL_MAX);
1193 len += input_print_modalias_bits(buf + len, size - len,
1194 'a', id->absbit, 0, ABS_MAX);
1195 len += input_print_modalias_bits(buf + len, size - len,
1196 'm', id->mscbit, 0, MSC_MAX);
1197 len += input_print_modalias_bits(buf + len, size - len,
1198 'l', id->ledbit, 0, LED_MAX);
1199 len += input_print_modalias_bits(buf + len, size - len,
1200 's', id->sndbit, 0, SND_MAX);
1201 len += input_print_modalias_bits(buf + len, size - len,
1202 'f', id->ffbit, 0, FF_MAX);
1203 len += input_print_modalias_bits(buf + len, size - len,
1204 'w', id->swbit, 0, SW_MAX);
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001205
1206 if (add_cr)
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001207 len += snprintf(buf + len, max(size - len, 0), "\n");
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001208
Rusty Russell1d8f4302005-12-07 21:40:34 +01001209 return len;
1210}
1211
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001212static ssize_t input_dev_show_modalias(struct device *dev,
1213 struct device_attribute *attr,
1214 char *buf)
Rusty Russell1d8f4302005-12-07 21:40:34 +01001215{
1216 struct input_dev *id = to_input_dev(dev);
Kay Sieversbd37e5a2006-01-05 13:19:55 +01001217 ssize_t len;
Rusty Russell1d8f4302005-12-07 21:40:34 +01001218
Dmitry Torokhov2db66872006-04-02 00:09:26 -05001219 len = input_print_modalias(buf, PAGE_SIZE, id, 1);
1220
Richard Purdie8a3cf452006-06-26 01:48:21 -04001221 return min_t(int, len, PAGE_SIZE);
Rusty Russell1d8f4302005-12-07 21:40:34 +01001222}
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001223static DEVICE_ATTR(modalias, S_IRUGO, input_dev_show_modalias, NULL);
Rusty Russell1d8f4302005-12-07 21:40:34 +01001224
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001225static struct attribute *input_dev_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001226 &dev_attr_name.attr,
1227 &dev_attr_phys.attr,
1228 &dev_attr_uniq.attr,
1229 &dev_attr_modalias.attr,
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001230 NULL
1231};
1232
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001233static struct attribute_group input_dev_attr_group = {
Greg Kroah-Hartman629b77a2005-10-27 22:25:43 -07001234 .attrs = input_dev_attrs,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001235};
1236
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001237#define INPUT_DEV_ID_ATTR(name) \
1238static ssize_t input_dev_show_id_##name(struct device *dev, \
1239 struct device_attribute *attr, \
1240 char *buf) \
1241{ \
1242 struct input_dev *input_dev = to_input_dev(dev); \
1243 return scnprintf(buf, PAGE_SIZE, "%04x\n", input_dev->id.name); \
1244} \
1245static DEVICE_ATTR(name, S_IRUGO, input_dev_show_id_##name, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001246
1247INPUT_DEV_ID_ATTR(bustype);
1248INPUT_DEV_ID_ATTR(vendor);
1249INPUT_DEV_ID_ATTR(product);
1250INPUT_DEV_ID_ATTR(version);
1251
1252static struct attribute *input_dev_id_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001253 &dev_attr_bustype.attr,
1254 &dev_attr_vendor.attr,
1255 &dev_attr_product.attr,
1256 &dev_attr_version.attr,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001257 NULL
1258};
1259
1260static struct attribute_group input_dev_id_attr_group = {
1261 .name = "id",
1262 .attrs = input_dev_id_attrs,
1263};
1264
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001265static int input_print_bitmap(char *buf, int buf_size, unsigned long *bitmap,
1266 int max, int add_cr)
1267{
1268 int i;
1269 int len = 0;
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001270 bool skip_empty = true;
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001271
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001272 for (i = BITS_TO_LONGS(max) - 1; i >= 0; i--) {
1273 len += input_bits_to_string(buf + len, max(buf_size - len, 0),
1274 bitmap[i], skip_empty);
1275 if (len) {
1276 skip_empty = false;
1277 if (i > 0)
1278 len += snprintf(buf + len, max(buf_size - len, 0), " ");
1279 }
1280 }
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001281
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001282 /*
1283 * If no output was produced print a single 0.
1284 */
1285 if (len == 0)
1286 len = snprintf(buf, buf_size, "%d", 0);
Dmitry Torokhov969b21c2006-04-02 00:09:34 -05001287
1288 if (add_cr)
1289 len += snprintf(buf + len, max(buf_size - len, 0), "\n");
1290
1291 return len;
1292}
1293
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001294#define INPUT_DEV_CAP_ATTR(ev, bm) \
1295static ssize_t input_dev_show_cap_##bm(struct device *dev, \
1296 struct device_attribute *attr, \
1297 char *buf) \
1298{ \
1299 struct input_dev *input_dev = to_input_dev(dev); \
1300 int len = input_print_bitmap(buf, PAGE_SIZE, \
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001301 input_dev->bm##bit, ev##_MAX, \
1302 true); \
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001303 return min_t(int, len, PAGE_SIZE); \
1304} \
1305static DEVICE_ATTR(bm, S_IRUGO, input_dev_show_cap_##bm, NULL)
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001306
1307INPUT_DEV_CAP_ATTR(EV, ev);
1308INPUT_DEV_CAP_ATTR(KEY, key);
1309INPUT_DEV_CAP_ATTR(REL, rel);
1310INPUT_DEV_CAP_ATTR(ABS, abs);
1311INPUT_DEV_CAP_ATTR(MSC, msc);
1312INPUT_DEV_CAP_ATTR(LED, led);
1313INPUT_DEV_CAP_ATTR(SND, snd);
1314INPUT_DEV_CAP_ATTR(FF, ff);
1315INPUT_DEV_CAP_ATTR(SW, sw);
1316
1317static struct attribute *input_dev_caps_attrs[] = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001318 &dev_attr_ev.attr,
1319 &dev_attr_key.attr,
1320 &dev_attr_rel.attr,
1321 &dev_attr_abs.attr,
1322 &dev_attr_msc.attr,
1323 &dev_attr_led.attr,
1324 &dev_attr_snd.attr,
1325 &dev_attr_ff.attr,
1326 &dev_attr_sw.attr,
Dmitry Torokhov5c1e9a62005-09-15 02:01:55 -05001327 NULL
1328};
1329
1330static struct attribute_group input_dev_caps_attr_group = {
1331 .name = "capabilities",
1332 .attrs = input_dev_caps_attrs,
1333};
1334
David Brownella4dbd672009-06-24 10:06:31 -07001335static const struct attribute_group *input_dev_attr_groups[] = {
Dmitry Torokhovcb9def42007-03-07 23:20:26 -05001336 &input_dev_attr_group,
1337 &input_dev_id_attr_group,
1338 &input_dev_caps_attr_group,
1339 NULL
1340};
1341
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001342static void input_dev_release(struct device *device)
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001343{
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001344 struct input_dev *dev = to_input_dev(device);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001345
Anssi Hannula509ca1a2006-07-19 01:40:22 -04001346 input_ff_destroy(dev);
Henrik Rydberg40d007e2010-07-15 23:10:10 -07001347 input_mt_destroy_slots(dev);
Daniel Mackd31b2862010-08-02 20:18:21 -07001348 kfree(dev->absinfo);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001349 kfree(dev);
Anssi Hannula509ca1a2006-07-19 01:40:22 -04001350
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001351 module_put(THIS_MODULE);
1352}
1353
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001354/*
Kay Sievers312c0042005-11-16 09:00:00 +01001355 * Input uevent interface - loading event handlers based on
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001356 * device bitfields.
1357 */
Kay Sievers7eff2e72007-08-14 15:15:12 +02001358static int input_add_uevent_bm_var(struct kobj_uevent_env *env,
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001359 const char *name, unsigned long *bitmap, int max)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001360{
Kay Sievers7eff2e72007-08-14 15:15:12 +02001361 int len;
1362
1363 if (add_uevent_var(env, "%s=", name))
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001364 return -ENOMEM;
1365
Kay Sievers7eff2e72007-08-14 15:15:12 +02001366 len = input_print_bitmap(&env->buf[env->buflen - 1],
1367 sizeof(env->buf) - env->buflen,
Dmitry Torokhov15e184a2010-01-11 00:05:43 -08001368 bitmap, max, false);
Kay Sievers7eff2e72007-08-14 15:15:12 +02001369 if (len >= (sizeof(env->buf) - env->buflen))
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001370 return -ENOMEM;
1371
Kay Sievers7eff2e72007-08-14 15:15:12 +02001372 env->buflen += len;
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001373 return 0;
1374}
1375
Kay Sievers7eff2e72007-08-14 15:15:12 +02001376static int input_add_uevent_modalias_var(struct kobj_uevent_env *env,
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001377 struct input_dev *dev)
1378{
Kay Sievers7eff2e72007-08-14 15:15:12 +02001379 int len;
1380
1381 if (add_uevent_var(env, "MODALIAS="))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001382 return -ENOMEM;
1383
Kay Sievers7eff2e72007-08-14 15:15:12 +02001384 len = input_print_modalias(&env->buf[env->buflen - 1],
1385 sizeof(env->buf) - env->buflen,
1386 dev, 0);
1387 if (len >= (sizeof(env->buf) - env->buflen))
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001388 return -ENOMEM;
1389
Kay Sievers7eff2e72007-08-14 15:15:12 +02001390 env->buflen += len;
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001391 return 0;
1392}
1393
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001394#define INPUT_ADD_HOTPLUG_VAR(fmt, val...) \
1395 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001396 int err = add_uevent_var(env, fmt, val); \
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001397 if (err) \
1398 return err; \
1399 } while (0)
1400
1401#define INPUT_ADD_HOTPLUG_BM_VAR(name, bm, max) \
1402 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001403 int err = input_add_uevent_bm_var(env, name, bm, max); \
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001404 if (err) \
1405 return err; \
1406 } while (0)
1407
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001408#define INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev) \
1409 do { \
Kay Sievers7eff2e72007-08-14 15:15:12 +02001410 int err = input_add_uevent_modalias_var(env, dev); \
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001411 if (err) \
1412 return err; \
1413 } while (0)
1414
Kay Sievers7eff2e72007-08-14 15:15:12 +02001415static int input_dev_uevent(struct device *device, struct kobj_uevent_env *env)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001416{
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001417 struct input_dev *dev = to_input_dev(device);
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001418
1419 INPUT_ADD_HOTPLUG_VAR("PRODUCT=%x/%x/%x/%x",
1420 dev->id.bustype, dev->id.vendor,
1421 dev->id.product, dev->id.version);
1422 if (dev->name)
1423 INPUT_ADD_HOTPLUG_VAR("NAME=\"%s\"", dev->name);
1424 if (dev->phys)
1425 INPUT_ADD_HOTPLUG_VAR("PHYS=\"%s\"", dev->phys);
Dmitry Torokhov08de1f02005-11-08 21:34:29 -08001426 if (dev->uniq)
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001427 INPUT_ADD_HOTPLUG_VAR("UNIQ=\"%s\"", dev->uniq);
1428
1429 INPUT_ADD_HOTPLUG_BM_VAR("EV=", dev->evbit, EV_MAX);
1430 if (test_bit(EV_KEY, dev->evbit))
1431 INPUT_ADD_HOTPLUG_BM_VAR("KEY=", dev->keybit, KEY_MAX);
1432 if (test_bit(EV_REL, dev->evbit))
1433 INPUT_ADD_HOTPLUG_BM_VAR("REL=", dev->relbit, REL_MAX);
1434 if (test_bit(EV_ABS, dev->evbit))
1435 INPUT_ADD_HOTPLUG_BM_VAR("ABS=", dev->absbit, ABS_MAX);
1436 if (test_bit(EV_MSC, dev->evbit))
1437 INPUT_ADD_HOTPLUG_BM_VAR("MSC=", dev->mscbit, MSC_MAX);
1438 if (test_bit(EV_LED, dev->evbit))
1439 INPUT_ADD_HOTPLUG_BM_VAR("LED=", dev->ledbit, LED_MAX);
1440 if (test_bit(EV_SND, dev->evbit))
1441 INPUT_ADD_HOTPLUG_BM_VAR("SND=", dev->sndbit, SND_MAX);
1442 if (test_bit(EV_FF, dev->evbit))
1443 INPUT_ADD_HOTPLUG_BM_VAR("FF=", dev->ffbit, FF_MAX);
1444 if (test_bit(EV_SW, dev->evbit))
1445 INPUT_ADD_HOTPLUG_BM_VAR("SW=", dev->swbit, SW_MAX);
1446
Dmitry Torokhovac648a62006-04-02 00:09:51 -05001447 INPUT_ADD_HOTPLUG_MODALIAS_VAR(dev);
Dmitry Torokhova7fadbe2005-09-15 02:01:57 -05001448
1449 return 0;
1450}
1451
Dmitry Torokhov3cc96352009-11-12 23:19:05 -08001452#define INPUT_DO_TOGGLE(dev, type, bits, on) \
1453 do { \
1454 int i; \
1455 bool active; \
1456 \
1457 if (!test_bit(EV_##type, dev->evbit)) \
1458 break; \
1459 \
1460 for (i = 0; i < type##_MAX; i++) { \
1461 if (!test_bit(i, dev->bits##bit)) \
1462 continue; \
1463 \
1464 active = test_bit(i, dev->bits); \
1465 if (!active && !on) \
1466 continue; \
1467 \
1468 dev->event(dev, EV_##type, i, on ? active : 0); \
1469 } \
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001470 } while (0)
1471
Andrew Morton1c4115e2009-10-01 15:43:55 -07001472#ifdef CONFIG_PM
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001473static void input_dev_reset(struct input_dev *dev, bool activate)
1474{
1475 if (!dev->event)
1476 return;
1477
1478 INPUT_DO_TOGGLE(dev, LED, led, activate);
1479 INPUT_DO_TOGGLE(dev, SND, snd, activate);
1480
1481 if (activate && test_bit(EV_REP, dev->evbit)) {
1482 dev->event(dev, EV_REP, REP_PERIOD, dev->rep[REP_PERIOD]);
1483 dev->event(dev, EV_REP, REP_DELAY, dev->rep[REP_DELAY]);
1484 }
1485}
1486
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001487static int input_dev_suspend(struct device *dev)
1488{
1489 struct input_dev *input_dev = to_input_dev(dev);
1490
1491 mutex_lock(&input_dev->mutex);
1492 input_dev_reset(input_dev, false);
1493 mutex_unlock(&input_dev->mutex);
1494
1495 return 0;
1496}
1497
1498static int input_dev_resume(struct device *dev)
1499{
1500 struct input_dev *input_dev = to_input_dev(dev);
1501
1502 mutex_lock(&input_dev->mutex);
1503 input_dev_reset(input_dev, true);
Oliver Neukum866d7d72010-07-01 09:01:50 -07001504
1505 /*
1506 * Keys that have been pressed at suspend time are unlikely
1507 * to be still pressed when we resume.
1508 */
1509 spin_lock_irq(&input_dev->event_lock);
1510 input_dev_release_keys(input_dev);
1511 spin_unlock_irq(&input_dev->event_lock);
1512
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001513 mutex_unlock(&input_dev->mutex);
1514
1515 return 0;
1516}
1517
1518static const struct dev_pm_ops input_dev_pm_ops = {
1519 .suspend = input_dev_suspend,
1520 .resume = input_dev_resume,
1521 .poweroff = input_dev_suspend,
1522 .restore = input_dev_resume,
1523};
1524#endif /* CONFIG_PM */
1525
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001526static struct device_type input_dev_type = {
1527 .groups = input_dev_attr_groups,
1528 .release = input_dev_release,
1529 .uevent = input_dev_uevent,
Dmitry Torokhovffd0db92009-09-16 01:06:43 -07001530#ifdef CONFIG_PM
1531 .pm = &input_dev_pm_ops,
1532#endif
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001533};
1534
Kay Sieverse454cea2009-09-18 23:01:12 +02001535static char *input_devnode(struct device *dev, mode_t *mode)
Kay Sieversaa5ed632009-04-30 15:23:42 +02001536{
1537 return kasprintf(GFP_KERNEL, "input/%s", dev_name(dev));
1538}
1539
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07001540struct class input_class = {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001541 .name = "input",
Kay Sieverse454cea2009-09-18 23:01:12 +02001542 .devnode = input_devnode,
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001543};
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001544EXPORT_SYMBOL_GPL(input_class);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001545
Dmitry Torokhov14471902006-11-02 23:26:55 -05001546/**
1547 * input_allocate_device - allocate memory for new input device
1548 *
1549 * Returns prepared struct input_dev or NULL.
1550 *
1551 * NOTE: Use input_free_device() to free devices that have not been
1552 * registered; input_unregister_device() should be used for already
1553 * registered devices.
1554 */
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001555struct input_dev *input_allocate_device(void)
1556{
1557 struct input_dev *dev;
1558
1559 dev = kzalloc(sizeof(struct input_dev), GFP_KERNEL);
1560 if (dev) {
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001561 dev->dev.type = &input_dev_type;
1562 dev->dev.class = &input_class;
1563 device_initialize(&dev->dev);
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001564 mutex_init(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -04001565 spin_lock_init(&dev->event_lock);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001566 INIT_LIST_HEAD(&dev->h_list);
1567 INIT_LIST_HEAD(&dev->node);
Dmitry Torokhov655816e2006-09-14 01:32:14 -04001568
1569 __module_get(THIS_MODULE);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001570 }
1571
1572 return dev;
1573}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001574EXPORT_SYMBOL(input_allocate_device);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05001575
Dmitry Torokhov14471902006-11-02 23:26:55 -05001576/**
1577 * input_free_device - free memory occupied by input_dev structure
1578 * @dev: input device to free
1579 *
1580 * This function should only be used if input_register_device()
1581 * was not called yet or if it failed. Once device was registered
1582 * use input_unregister_device() and memory will be freed once last
Dmitry Torokhov80064792007-08-30 00:22:11 -04001583 * reference to the device is dropped.
Dmitry Torokhov14471902006-11-02 23:26:55 -05001584 *
1585 * Device should be allocated by input_allocate_device().
1586 *
1587 * NOTE: If there are references to the input device then memory
1588 * will not be freed until last reference is dropped.
1589 */
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001590void input_free_device(struct input_dev *dev)
1591{
Dmitry Torokhov54f9e362007-03-16 00:57:25 -04001592 if (dev)
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001593 input_put_device(dev);
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001594}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001595EXPORT_SYMBOL(input_free_device);
Dmitry Torokhovf60d2b12006-06-26 01:48:36 -04001596
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001597/**
Henrik Rydberg40d007e2010-07-15 23:10:10 -07001598 * input_mt_create_slots() - create MT input slots
1599 * @dev: input device supporting MT events and finger tracking
1600 * @num_slots: number of slots used by the device
1601 *
1602 * This function allocates all necessary memory for MT slot handling
1603 * in the input device, and adds ABS_MT_SLOT to the device capabilities.
1604 */
1605int input_mt_create_slots(struct input_dev *dev, unsigned int num_slots)
1606{
1607 if (!num_slots)
1608 return 0;
1609
1610 dev->mt = kcalloc(num_slots, sizeof(struct input_mt_slot), GFP_KERNEL);
1611 if (!dev->mt)
1612 return -ENOMEM;
1613
1614 dev->mtsize = num_slots;
1615 input_set_abs_params(dev, ABS_MT_SLOT, 0, num_slots - 1, 0, 0);
1616
1617 return 0;
1618}
1619EXPORT_SYMBOL(input_mt_create_slots);
1620
1621/**
1622 * input_mt_destroy_slots() - frees the MT slots of the input device
1623 * @dev: input device with allocated MT slots
1624 *
1625 * This function is only needed in error path as the input core will
1626 * automatically free the MT slots when the device is destroyed.
1627 */
1628void input_mt_destroy_slots(struct input_dev *dev)
1629{
1630 kfree(dev->mt);
1631 dev->mt = NULL;
1632 dev->mtsize = 0;
1633}
1634EXPORT_SYMBOL(input_mt_destroy_slots);
1635
1636/**
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001637 * input_set_capability - mark device as capable of a certain event
1638 * @dev: device that is capable of emitting or accepting event
1639 * @type: type of the event (EV_KEY, EV_REL, etc...)
1640 * @code: event code
1641 *
1642 * In addition to setting up corresponding bit in appropriate capability
1643 * bitmap the function also adjusts dev->evbit.
1644 */
1645void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code)
1646{
1647 switch (type) {
1648 case EV_KEY:
1649 __set_bit(code, dev->keybit);
1650 break;
1651
1652 case EV_REL:
1653 __set_bit(code, dev->relbit);
1654 break;
1655
1656 case EV_ABS:
1657 __set_bit(code, dev->absbit);
1658 break;
1659
1660 case EV_MSC:
1661 __set_bit(code, dev->mscbit);
1662 break;
1663
1664 case EV_SW:
1665 __set_bit(code, dev->swbit);
1666 break;
1667
1668 case EV_LED:
1669 __set_bit(code, dev->ledbit);
1670 break;
1671
1672 case EV_SND:
1673 __set_bit(code, dev->sndbit);
1674 break;
1675
1676 case EV_FF:
1677 __set_bit(code, dev->ffbit);
1678 break;
1679
Dmitry Baryshkov22d1c392007-12-14 01:21:03 -05001680 case EV_PWR:
1681 /* do nothing */
1682 break;
1683
Dmitry Torokhov534565f2007-04-25 00:53:18 -04001684 default:
1685 printk(KERN_ERR
1686 "input_set_capability: unknown type %u (code %u)\n",
1687 type, code);
1688 dump_stack();
1689 return;
1690 }
1691
1692 __set_bit(type, dev->evbit);
1693}
1694EXPORT_SYMBOL(input_set_capability);
1695
Dmitry Torokhov92a3a582010-01-05 17:56:01 -08001696#define INPUT_CLEANSE_BITMASK(dev, type, bits) \
1697 do { \
1698 if (!test_bit(EV_##type, dev->evbit)) \
1699 memset(dev->bits##bit, 0, \
1700 sizeof(dev->bits##bit)); \
1701 } while (0)
1702
1703static void input_cleanse_bitmasks(struct input_dev *dev)
1704{
1705 INPUT_CLEANSE_BITMASK(dev, KEY, key);
1706 INPUT_CLEANSE_BITMASK(dev, REL, rel);
1707 INPUT_CLEANSE_BITMASK(dev, ABS, abs);
1708 INPUT_CLEANSE_BITMASK(dev, MSC, msc);
1709 INPUT_CLEANSE_BITMASK(dev, LED, led);
1710 INPUT_CLEANSE_BITMASK(dev, SND, snd);
1711 INPUT_CLEANSE_BITMASK(dev, FF, ff);
1712 INPUT_CLEANSE_BITMASK(dev, SW, sw);
1713}
1714
Dmitry Torokhov80064792007-08-30 00:22:11 -04001715/**
1716 * input_register_device - register device with input core
1717 * @dev: device to be registered
1718 *
1719 * This function registers device with input core. The device must be
1720 * allocated with input_allocate_device() and all it's capabilities
1721 * set up before registering.
1722 * If function fails the device must be freed with input_free_device().
1723 * Once device has been successfully registered it can be unregistered
1724 * with input_unregister_device(); input_free_device() should not be
1725 * called in this case.
1726 */
Dmitry Torokhov5f945482005-11-02 22:51:46 -05001727int input_register_device(struct input_dev *dev)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001728{
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001729 static atomic_t input_no = ATOMIC_INIT(0);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001730 struct input_handler *handler;
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001731 const char *path;
1732 int error;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001733
Dmitry Torokhov4f93df42010-01-05 17:56:00 -08001734 /* Every input device generates EV_SYN/SYN_REPORT events. */
Dmitry Torokhov80064792007-08-30 00:22:11 -04001735 __set_bit(EV_SYN, dev->evbit);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001736
Dmitry Torokhov4f93df42010-01-05 17:56:00 -08001737 /* KEY_RESERVED is not supposed to be transmitted to userspace. */
1738 __clear_bit(KEY_RESERVED, dev->keybit);
1739
Dmitry Torokhov92a3a582010-01-05 17:56:01 -08001740 /* Make sure that bitmasks not mentioned in dev->evbit are clean. */
1741 input_cleanse_bitmasks(dev);
1742
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001743 /*
1744 * If delay and period are pre-set by the driver, then autorepeating
1745 * is handled by the driver itself and we don't do it in input.c.
1746 */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001747 init_timer(&dev->timer);
1748 if (!dev->rep[REP_DELAY] && !dev->rep[REP_PERIOD]) {
1749 dev->timer.data = (long) dev;
1750 dev->timer.function = input_repeat_key;
1751 dev->rep[REP_DELAY] = 250;
1752 dev->rep[REP_PERIOD] = 33;
1753 }
1754
Marvin Raaijmakersc8e4c772007-03-14 22:50:42 -04001755 if (!dev->getkeycode)
1756 dev->getkeycode = input_default_getkeycode;
1757
1758 if (!dev->setkeycode)
1759 dev->setkeycode = input_default_setkeycode;
1760
Kay Sieversa6c24902008-10-30 00:07:50 -04001761 dev_set_name(&dev->dev, "input%ld",
1762 (unsigned long) atomic_inc_return(&input_no) - 1);
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001763
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001764 error = device_add(&dev->dev);
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001765 if (error)
1766 return error;
1767
Dmitry Torokhov9657d752007-06-14 23:32:24 -04001768 path = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
Dmitry Torokhovbd0ef232005-11-20 00:56:31 -05001769 printk(KERN_INFO "input: %s as %s\n",
1770 dev->name ? dev->name : "Unspecified device", path ? path : "N/A");
1771 kfree(path);
Greg Kroah-Hartman10204022005-10-27 22:25:43 -07001772
Dmitry Torokhov80064792007-08-30 00:22:11 -04001773 error = mutex_lock_interruptible(&input_mutex);
1774 if (error) {
1775 device_del(&dev->dev);
1776 return error;
1777 }
1778
1779 list_add_tail(&dev->node, &input_dev_list);
1780
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001781 list_for_each_entry(handler, &input_handler_list, node)
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001782 input_attach_handler(dev, handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001783
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001784 input_wakeup_procfs_readers();
Dmitry Torokhov5f945482005-11-02 22:51:46 -05001785
Dmitry Torokhov80064792007-08-30 00:22:11 -04001786 mutex_unlock(&input_mutex);
1787
Dmitry Torokhov5f945482005-11-02 22:51:46 -05001788 return 0;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001789}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001790EXPORT_SYMBOL(input_register_device);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001791
Dmitry Torokhov80064792007-08-30 00:22:11 -04001792/**
1793 * input_unregister_device - unregister previously registered device
1794 * @dev: device to be unregistered
1795 *
1796 * This function unregisters an input device. Once device is unregistered
1797 * the caller should not try to access it as it may get freed at any moment.
1798 */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001799void input_unregister_device(struct input_dev *dev)
1800{
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001801 struct input_handle *handle, *next;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001802
Dmitry Torokhov80064792007-08-30 00:22:11 -04001803 input_disconnect_device(dev);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001804
Dmitry Torokhov80064792007-08-30 00:22:11 -04001805 mutex_lock(&input_mutex);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001806
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001807 list_for_each_entry_safe(handle, next, &dev->h_list, d_node)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001808 handle->handler->disconnect(handle);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001809 WARN_ON(!list_empty(&dev->h_list));
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001810
Dmitry Torokhov80064792007-08-30 00:22:11 -04001811 del_timer_sync(&dev->timer);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001812 list_del_init(&dev->node);
1813
1814 input_wakeup_procfs_readers();
Dmitry Torokhov80064792007-08-30 00:22:11 -04001815
1816 mutex_unlock(&input_mutex);
1817
1818 device_unregister(&dev->dev);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001819}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001820EXPORT_SYMBOL(input_unregister_device);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001821
Dmitry Torokhov80064792007-08-30 00:22:11 -04001822/**
1823 * input_register_handler - register a new input handler
1824 * @handler: handler to be registered
1825 *
1826 * This function registers a new input handler (interface) for input
1827 * devices in the system and attaches it to all input devices that
1828 * are compatible with the handler.
1829 */
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001830int input_register_handler(struct input_handler *handler)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001831{
1832 struct input_dev *dev;
Dmitry Torokhov80064792007-08-30 00:22:11 -04001833 int retval;
1834
1835 retval = mutex_lock_interruptible(&input_mutex);
1836 if (retval)
1837 return retval;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001838
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001839 INIT_LIST_HEAD(&handler->h_list);
1840
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001841 if (handler->fops != NULL) {
Dmitry Torokhov80064792007-08-30 00:22:11 -04001842 if (input_table[handler->minor >> 5]) {
1843 retval = -EBUSY;
1844 goto out;
1845 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001846 input_table[handler->minor >> 5] = handler;
Dmitry Torokhov4263cf02006-09-14 01:32:39 -04001847 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001848
1849 list_add_tail(&handler->node, &input_handler_list);
1850
1851 list_for_each_entry(dev, &input_dev_list, node)
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001852 input_attach_handler(dev, handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001853
1854 input_wakeup_procfs_readers();
Dmitry Torokhov80064792007-08-30 00:22:11 -04001855
1856 out:
1857 mutex_unlock(&input_mutex);
1858 return retval;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001859}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001860EXPORT_SYMBOL(input_register_handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001861
Dmitry Torokhov80064792007-08-30 00:22:11 -04001862/**
1863 * input_unregister_handler - unregisters an input handler
1864 * @handler: handler to be unregistered
1865 *
1866 * This function disconnects a handler from its input devices and
1867 * removes it from lists of known handlers.
1868 */
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001869void input_unregister_handler(struct input_handler *handler)
1870{
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001871 struct input_handle *handle, *next;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001872
Dmitry Torokhov80064792007-08-30 00:22:11 -04001873 mutex_lock(&input_mutex);
1874
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001875 list_for_each_entry_safe(handle, next, &handler->h_list, h_node)
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001876 handler->disconnect(handle);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001877 WARN_ON(!list_empty(&handler->h_list));
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001878
1879 list_del_init(&handler->node);
1880
1881 if (handler->fops != NULL)
1882 input_table[handler->minor >> 5] = NULL;
1883
1884 input_wakeup_procfs_readers();
Dmitry Torokhov80064792007-08-30 00:22:11 -04001885
1886 mutex_unlock(&input_mutex);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001887}
Dmitry Torokhovca56fe02006-06-26 01:49:21 -04001888EXPORT_SYMBOL(input_unregister_handler);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05001889
Dmitry Torokhov80064792007-08-30 00:22:11 -04001890/**
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08001891 * input_handler_for_each_handle - handle iterator
1892 * @handler: input handler to iterate
1893 * @data: data for the callback
1894 * @fn: function to be called for each handle
1895 *
1896 * Iterate over @bus's list of devices, and call @fn for each, passing
1897 * it @data and stop when @fn returns a non-zero value. The function is
1898 * using RCU to traverse the list and therefore may be usind in atonic
1899 * contexts. The @fn callback is invoked from RCU critical section and
1900 * thus must not sleep.
1901 */
1902int input_handler_for_each_handle(struct input_handler *handler, void *data,
1903 int (*fn)(struct input_handle *, void *))
1904{
1905 struct input_handle *handle;
1906 int retval = 0;
1907
1908 rcu_read_lock();
1909
1910 list_for_each_entry_rcu(handle, &handler->h_list, h_node) {
1911 retval = fn(handle, data);
1912 if (retval)
1913 break;
1914 }
1915
1916 rcu_read_unlock();
1917
1918 return retval;
1919}
1920EXPORT_SYMBOL(input_handler_for_each_handle);
1921
1922/**
Dmitry Torokhov80064792007-08-30 00:22:11 -04001923 * input_register_handle - register a new input handle
1924 * @handle: handle to register
1925 *
1926 * This function puts a new input handle onto device's
1927 * and handler's lists so that events can flow through
1928 * it once it is opened using input_open_device().
1929 *
1930 * This function is supposed to be called from handler's
1931 * connect() method.
1932 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001933int input_register_handle(struct input_handle *handle)
1934{
1935 struct input_handler *handler = handle->handler;
Dmitry Torokhov80064792007-08-30 00:22:11 -04001936 struct input_dev *dev = handle->dev;
1937 int error;
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001938
Dmitry Torokhov80064792007-08-30 00:22:11 -04001939 /*
1940 * We take dev->mutex here to prevent race with
1941 * input_release_device().
1942 */
1943 error = mutex_lock_interruptible(&dev->mutex);
1944 if (error)
1945 return error;
Dmitry Torokhovef7995f2010-01-29 23:59:12 -08001946
1947 /*
1948 * Filters go to the head of the list, normal handlers
1949 * to the tail.
1950 */
1951 if (handler->filter)
1952 list_add_rcu(&handle->d_node, &dev->h_list);
1953 else
1954 list_add_tail_rcu(&handle->d_node, &dev->h_list);
1955
Dmitry Torokhov80064792007-08-30 00:22:11 -04001956 mutex_unlock(&dev->mutex);
Dmitry Torokhov80064792007-08-30 00:22:11 -04001957
1958 /*
1959 * Since we are supposed to be called from ->connect()
1960 * which is mutually exclusive with ->disconnect()
1961 * we can't be racing with input_unregister_handle()
1962 * and so separate lock is not needed here.
1963 */
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08001964 list_add_tail_rcu(&handle->h_node, &handler->h_list);
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001965
1966 if (handler->start)
1967 handler->start(handle);
1968
1969 return 0;
1970}
1971EXPORT_SYMBOL(input_register_handle);
1972
Dmitry Torokhov80064792007-08-30 00:22:11 -04001973/**
1974 * input_unregister_handle - unregister an input handle
1975 * @handle: handle to unregister
1976 *
1977 * This function removes input handle from device's
1978 * and handler's lists.
1979 *
1980 * This function is supposed to be called from handler's
1981 * disconnect() method.
1982 */
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001983void input_unregister_handle(struct input_handle *handle)
1984{
Dmitry Torokhov80064792007-08-30 00:22:11 -04001985 struct input_dev *dev = handle->dev;
1986
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08001987 list_del_rcu(&handle->h_node);
Dmitry Torokhov80064792007-08-30 00:22:11 -04001988
1989 /*
1990 * Take dev->mutex to prevent race with input_release_device().
1991 */
1992 mutex_lock(&dev->mutex);
1993 list_del_rcu(&handle->d_node);
1994 mutex_unlock(&dev->mutex);
Dmitry Torokhov66d2a592009-12-01 21:54:35 -08001995
Dmitry Torokhov82ba56c2007-10-13 15:46:55 -04001996 synchronize_rcu();
Dmitry Torokhov5b2a0822007-04-12 01:29:46 -04001997}
1998EXPORT_SYMBOL(input_unregister_handle);
1999
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002000static int input_open_file(struct inode *inode, struct file *file)
2001{
Jonathan Corbet2edbf852008-05-15 10:37:16 -06002002 struct input_handler *handler;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -08002003 const struct file_operations *old_fops, *new_fops = NULL;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002004 int err;
2005
Arnd Bergmann2f2177c2010-03-09 20:38:48 -08002006 err = mutex_lock_interruptible(&input_mutex);
2007 if (err)
2008 return err;
2009
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002010 /* No load-on-demand here? */
Jonathan Corbet2edbf852008-05-15 10:37:16 -06002011 handler = input_table[iminor(inode) >> 5];
Arnd Bergmann2f2177c2010-03-09 20:38:48 -08002012 if (handler)
2013 new_fops = fops_get(handler->fops);
2014
2015 mutex_unlock(&input_mutex);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002016
2017 /*
2018 * That's _really_ odd. Usually NULL ->open means "nothing special",
2019 * not "no device". Oh, well...
2020 */
Arnd Bergmann2f2177c2010-03-09 20:38:48 -08002021 if (!new_fops || !new_fops->open) {
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002022 fops_put(new_fops);
Jonathan Corbet2edbf852008-05-15 10:37:16 -06002023 err = -ENODEV;
2024 goto out;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002025 }
Arnd Bergmann2f2177c2010-03-09 20:38:48 -08002026
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002027 old_fops = file->f_op;
2028 file->f_op = new_fops;
2029
2030 err = new_fops->open(inode, file);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002031 if (err) {
2032 fops_put(file->f_op);
2033 file->f_op = fops_get(old_fops);
2034 }
2035 fops_put(old_fops);
Jonathan Corbet2edbf852008-05-15 10:37:16 -06002036out:
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002037 return err;
2038}
2039
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08002040static const struct file_operations input_fops = {
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002041 .owner = THIS_MODULE,
2042 .open = input_open_file,
2043};
2044
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045static int __init input_init(void)
2046{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002047 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002048
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002049 err = class_register(&input_class);
Dmitry Torokhovd19fbe82005-09-15 02:01:39 -05002050 if (err) {
2051 printk(KERN_ERR "input: unable to register input_dev class\n");
2052 return err;
2053 }
2054
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002055 err = input_proc_init();
2056 if (err)
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002057 goto fail1;
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002058
2059 err = register_chrdev(INPUT_MAJOR, "input", &input_fops);
2060 if (err) {
2061 printk(KERN_ERR "input: unable to register char major %d", INPUT_MAJOR);
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002062 goto fail2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063 }
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002064
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002065 return 0;
2066
Greg Kroah-Hartmanb0fdfeb2005-10-27 22:25:43 -07002067 fail2: input_proc_exit();
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002068 fail1: class_unregister(&input_class);
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002069 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070}
2071
2072static void __exit input_exit(void)
2073{
Dmitry Torokhovf96b4342005-06-30 00:50:29 -05002074 input_proc_exit();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075 unregister_chrdev(INPUT_MAJOR, "input");
Greg Kroah-Hartmanea9f2402005-10-27 22:25:43 -07002076 class_unregister(&input_class);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077}
2078
2079subsys_initcall(input_init);
2080module_exit(input_exit);