Input: uinput - add compat ioctl number translation for UI_*_FF_UPLOAD
[sfrench/cifs-2.6.git] / drivers / input / misc / uinput.c
1 /*
2  *  User level driver support for input subsystem
3  *
4  * Heavily based on evdev.c by Vojtech Pavlik
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  *
20  * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
21  *
22  * Changes/Revisions:
23  *      0.4     01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
24  *              - add UI_GET_SYSNAME ioctl
25  *      0.3     09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
26  *              - updated ff support for the changes in kernel interface
27  *              - added MODULE_VERSION
28  *      0.2     16/10/2004 (Micah Dowty <micah@navi.cx>)
29  *              - added force feedback support
30  *              - added UI_SET_PHYS
31  *      0.1     20/06/2002
32  *              - first public version
33  */
34 #include <uapi/linux/uinput.h>
35 #include <linux/poll.h>
36 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/fs.h>
41 #include <linux/miscdevice.h>
42 #include <linux/overflow.h>
43 #include <linux/input/mt.h>
44 #include "../input-compat.h"
45
46 #define UINPUT_NAME             "uinput"
47 #define UINPUT_BUFFER_SIZE      16
48 #define UINPUT_NUM_REQUESTS     16
49
50 enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };
51
52 struct uinput_request {
53         unsigned int            id;
54         unsigned int            code;   /* UI_FF_UPLOAD, UI_FF_ERASE */
55
56         int                     retval;
57         struct completion       done;
58
59         union {
60                 unsigned int    effect_id;
61                 struct {
62                         struct ff_effect *effect;
63                         struct ff_effect *old;
64                 } upload;
65         } u;
66 };
67
68 struct uinput_device {
69         struct input_dev        *dev;
70         struct mutex            mutex;
71         enum uinput_state       state;
72         wait_queue_head_t       waitq;
73         unsigned char           ready;
74         unsigned char           head;
75         unsigned char           tail;
76         struct input_event      buff[UINPUT_BUFFER_SIZE];
77         unsigned int            ff_effects_max;
78
79         struct uinput_request   *requests[UINPUT_NUM_REQUESTS];
80         wait_queue_head_t       requests_waitq;
81         spinlock_t              requests_lock;
82 };
83
84 static int uinput_dev_event(struct input_dev *dev,
85                             unsigned int type, unsigned int code, int value)
86 {
87         struct uinput_device    *udev = input_get_drvdata(dev);
88         struct timespec64       ts;
89
90         udev->buff[udev->head].type = type;
91         udev->buff[udev->head].code = code;
92         udev->buff[udev->head].value = value;
93         ktime_get_ts64(&ts);
94         udev->buff[udev->head].input_event_sec = ts.tv_sec;
95         udev->buff[udev->head].input_event_usec = ts.tv_nsec / NSEC_PER_USEC;
96         udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
97
98         wake_up_interruptible(&udev->waitq);
99
100         return 0;
101 }
102
103 /* Atomically allocate an ID for the given request. Returns 0 on success. */
104 static bool uinput_request_alloc_id(struct uinput_device *udev,
105                                     struct uinput_request *request)
106 {
107         unsigned int id;
108         bool reserved = false;
109
110         spin_lock(&udev->requests_lock);
111
112         for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
113                 if (!udev->requests[id]) {
114                         request->id = id;
115                         udev->requests[id] = request;
116                         reserved = true;
117                         break;
118                 }
119         }
120
121         spin_unlock(&udev->requests_lock);
122         return reserved;
123 }
124
125 static struct uinput_request *uinput_request_find(struct uinput_device *udev,
126                                                   unsigned int id)
127 {
128         /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
129         if (id >= UINPUT_NUM_REQUESTS)
130                 return NULL;
131
132         return udev->requests[id];
133 }
134
135 static int uinput_request_reserve_slot(struct uinput_device *udev,
136                                        struct uinput_request *request)
137 {
138         /* Allocate slot. If none are available right away, wait. */
139         return wait_event_interruptible(udev->requests_waitq,
140                                         uinput_request_alloc_id(udev, request));
141 }
142
143 static void uinput_request_release_slot(struct uinput_device *udev,
144                                         unsigned int id)
145 {
146         /* Mark slot as available */
147         spin_lock(&udev->requests_lock);
148         udev->requests[id] = NULL;
149         spin_unlock(&udev->requests_lock);
150
151         wake_up(&udev->requests_waitq);
152 }
153
154 static int uinput_request_send(struct uinput_device *udev,
155                                struct uinput_request *request)
156 {
157         int retval;
158
159         retval = mutex_lock_interruptible(&udev->mutex);
160         if (retval)
161                 return retval;
162
163         if (udev->state != UIST_CREATED) {
164                 retval = -ENODEV;
165                 goto out;
166         }
167
168         init_completion(&request->done);
169
170         /*
171          * Tell our userspace application about this new request
172          * by queueing an input event.
173          */
174         uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
175
176  out:
177         mutex_unlock(&udev->mutex);
178         return retval;
179 }
180
181 static int uinput_request_submit(struct uinput_device *udev,
182                                  struct uinput_request *request)
183 {
184         int retval;
185
186         retval = uinput_request_reserve_slot(udev, request);
187         if (retval)
188                 return retval;
189
190         retval = uinput_request_send(udev, request);
191         if (retval)
192                 goto out;
193
194         if (!wait_for_completion_timeout(&request->done, 30 * HZ)) {
195                 retval = -ETIMEDOUT;
196                 goto out;
197         }
198
199         retval = request->retval;
200
201  out:
202         uinput_request_release_slot(udev, request->id);
203         return retval;
204 }
205
206 /*
207  * Fail all outstanding requests so handlers don't wait for the userspace
208  * to finish processing them.
209  */
210 static void uinput_flush_requests(struct uinput_device *udev)
211 {
212         struct uinput_request *request;
213         int i;
214
215         spin_lock(&udev->requests_lock);
216
217         for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
218                 request = udev->requests[i];
219                 if (request) {
220                         request->retval = -ENODEV;
221                         complete(&request->done);
222                 }
223         }
224
225         spin_unlock(&udev->requests_lock);
226 }
227
228 static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
229 {
230         uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
231 }
232
233 static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
234 {
235         uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
236 }
237
238 static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
239 {
240         return uinput_dev_event(dev, EV_FF, effect_id, value);
241 }
242
243 static int uinput_dev_upload_effect(struct input_dev *dev,
244                                     struct ff_effect *effect,
245                                     struct ff_effect *old)
246 {
247         struct uinput_device *udev = input_get_drvdata(dev);
248         struct uinput_request request;
249
250         /*
251          * uinput driver does not currently support periodic effects with
252          * custom waveform since it does not have a way to pass buffer of
253          * samples (custom_data) to userspace. If ever there is a device
254          * supporting custom waveforms we would need to define an additional
255          * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
256          */
257         if (effect->type == FF_PERIODIC &&
258                         effect->u.periodic.waveform == FF_CUSTOM)
259                 return -EINVAL;
260
261         request.code = UI_FF_UPLOAD;
262         request.u.upload.effect = effect;
263         request.u.upload.old = old;
264
265         return uinput_request_submit(udev, &request);
266 }
267
268 static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
269 {
270         struct uinput_device *udev = input_get_drvdata(dev);
271         struct uinput_request request;
272
273         if (!test_bit(EV_FF, dev->evbit))
274                 return -ENOSYS;
275
276         request.code = UI_FF_ERASE;
277         request.u.effect_id = effect_id;
278
279         return uinput_request_submit(udev, &request);
280 }
281
282 static int uinput_dev_flush(struct input_dev *dev, struct file *file)
283 {
284         /*
285          * If we are called with file == NULL that means we are tearing
286          * down the device, and therefore we can not handle FF erase
287          * requests: either we are handling UI_DEV_DESTROY (and holding
288          * the udev->mutex), or the file descriptor is closed and there is
289          * nobody on the other side anymore.
290          */
291         return file ? input_ff_flush(dev, file) : 0;
292 }
293
294 static void uinput_destroy_device(struct uinput_device *udev)
295 {
296         const char *name, *phys;
297         struct input_dev *dev = udev->dev;
298         enum uinput_state old_state = udev->state;
299
300         udev->state = UIST_NEW_DEVICE;
301
302         if (dev) {
303                 name = dev->name;
304                 phys = dev->phys;
305                 if (old_state == UIST_CREATED) {
306                         uinput_flush_requests(udev);
307                         input_unregister_device(dev);
308                 } else {
309                         input_free_device(dev);
310                 }
311                 kfree(name);
312                 kfree(phys);
313                 udev->dev = NULL;
314         }
315 }
316
317 static int uinput_create_device(struct uinput_device *udev)
318 {
319         struct input_dev *dev = udev->dev;
320         int error, nslot;
321
322         if (udev->state != UIST_SETUP_COMPLETE) {
323                 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
324                 return -EINVAL;
325         }
326
327         if (test_bit(EV_ABS, dev->evbit)) {
328                 input_alloc_absinfo(dev);
329                 if (!dev->absinfo) {
330                         error = -EINVAL;
331                         goto fail1;
332                 }
333
334                 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
335                         nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
336                         error = input_mt_init_slots(dev, nslot, 0);
337                         if (error)
338                                 goto fail1;
339                 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
340                         input_set_events_per_packet(dev, 60);
341                 }
342         }
343
344         if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) {
345                 printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n",
346                         UINPUT_NAME);
347                 error = -EINVAL;
348                 goto fail1;
349         }
350
351         if (udev->ff_effects_max) {
352                 error = input_ff_create(dev, udev->ff_effects_max);
353                 if (error)
354                         goto fail1;
355
356                 dev->ff->upload = uinput_dev_upload_effect;
357                 dev->ff->erase = uinput_dev_erase_effect;
358                 dev->ff->playback = uinput_dev_playback;
359                 dev->ff->set_gain = uinput_dev_set_gain;
360                 dev->ff->set_autocenter = uinput_dev_set_autocenter;
361                 /*
362                  * The standard input_ff_flush() implementation does
363                  * not quite work for uinput as we can't reasonably
364                  * handle FF requests during device teardown.
365                  */
366                 dev->flush = uinput_dev_flush;
367         }
368
369         dev->event = uinput_dev_event;
370
371         input_set_drvdata(udev->dev, udev);
372
373         error = input_register_device(udev->dev);
374         if (error)
375                 goto fail2;
376
377         udev->state = UIST_CREATED;
378
379         return 0;
380
381  fail2: input_ff_destroy(dev);
382  fail1: uinput_destroy_device(udev);
383         return error;
384 }
385
386 static int uinput_open(struct inode *inode, struct file *file)
387 {
388         struct uinput_device *newdev;
389
390         newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
391         if (!newdev)
392                 return -ENOMEM;
393
394         mutex_init(&newdev->mutex);
395         spin_lock_init(&newdev->requests_lock);
396         init_waitqueue_head(&newdev->requests_waitq);
397         init_waitqueue_head(&newdev->waitq);
398         newdev->state = UIST_NEW_DEVICE;
399
400         file->private_data = newdev;
401         nonseekable_open(inode, file);
402
403         return 0;
404 }
405
406 static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
407                                    const struct input_absinfo *abs)
408 {
409         int min, max, range;
410
411         min = abs->minimum;
412         max = abs->maximum;
413
414         if ((min != 0 || max != 0) && max < min) {
415                 printk(KERN_DEBUG
416                        "%s: invalid abs[%02x] min:%d max:%d\n",
417                        UINPUT_NAME, code, min, max);
418                 return -EINVAL;
419         }
420
421         if (!check_sub_overflow(max, min, &range) && abs->flat > range) {
422                 printk(KERN_DEBUG
423                        "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
424                        UINPUT_NAME, code, abs->flat, min, max);
425                 return -EINVAL;
426         }
427
428         return 0;
429 }
430
431 static int uinput_validate_absbits(struct input_dev *dev)
432 {
433         unsigned int cnt;
434         int error;
435
436         if (!test_bit(EV_ABS, dev->evbit))
437                 return 0;
438
439         /*
440          * Check if absmin/absmax/absfuzz/absflat are sane.
441          */
442
443         for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
444                 if (!dev->absinfo)
445                         return -EINVAL;
446
447                 error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
448                 if (error)
449                         return error;
450         }
451
452         return 0;
453 }
454
455 static int uinput_dev_setup(struct uinput_device *udev,
456                             struct uinput_setup __user *arg)
457 {
458         struct uinput_setup setup;
459         struct input_dev *dev;
460
461         if (udev->state == UIST_CREATED)
462                 return -EINVAL;
463
464         if (copy_from_user(&setup, arg, sizeof(setup)))
465                 return -EFAULT;
466
467         if (!setup.name[0])
468                 return -EINVAL;
469
470         dev = udev->dev;
471         dev->id = setup.id;
472         udev->ff_effects_max = setup.ff_effects_max;
473
474         kfree(dev->name);
475         dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL);
476         if (!dev->name)
477                 return -ENOMEM;
478
479         udev->state = UIST_SETUP_COMPLETE;
480         return 0;
481 }
482
483 static int uinput_abs_setup(struct uinput_device *udev,
484                             struct uinput_setup __user *arg, size_t size)
485 {
486         struct uinput_abs_setup setup = {};
487         struct input_dev *dev;
488         int error;
489
490         if (size > sizeof(setup))
491                 return -E2BIG;
492
493         if (udev->state == UIST_CREATED)
494                 return -EINVAL;
495
496         if (copy_from_user(&setup, arg, size))
497                 return -EFAULT;
498
499         if (setup.code > ABS_MAX)
500                 return -ERANGE;
501
502         dev = udev->dev;
503
504         error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
505         if (error)
506                 return error;
507
508         input_alloc_absinfo(dev);
509         if (!dev->absinfo)
510                 return -ENOMEM;
511
512         set_bit(setup.code, dev->absbit);
513         dev->absinfo[setup.code] = setup.absinfo;
514         return 0;
515 }
516
517 /* legacy setup via write() */
518 static int uinput_setup_device_legacy(struct uinput_device *udev,
519                                       const char __user *buffer, size_t count)
520 {
521         struct uinput_user_dev  *user_dev;
522         struct input_dev        *dev;
523         int                     i;
524         int                     retval;
525
526         if (count != sizeof(struct uinput_user_dev))
527                 return -EINVAL;
528
529         if (!udev->dev) {
530                 udev->dev = input_allocate_device();
531                 if (!udev->dev)
532                         return -ENOMEM;
533         }
534
535         dev = udev->dev;
536
537         user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
538         if (IS_ERR(user_dev))
539                 return PTR_ERR(user_dev);
540
541         udev->ff_effects_max = user_dev->ff_effects_max;
542
543         /* Ensure name is filled in */
544         if (!user_dev->name[0]) {
545                 retval = -EINVAL;
546                 goto exit;
547         }
548
549         kfree(dev->name);
550         dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
551                              GFP_KERNEL);
552         if (!dev->name) {
553                 retval = -ENOMEM;
554                 goto exit;
555         }
556
557         dev->id.bustype = user_dev->id.bustype;
558         dev->id.vendor  = user_dev->id.vendor;
559         dev->id.product = user_dev->id.product;
560         dev->id.version = user_dev->id.version;
561
562         for (i = 0; i < ABS_CNT; i++) {
563                 input_abs_set_max(dev, i, user_dev->absmax[i]);
564                 input_abs_set_min(dev, i, user_dev->absmin[i]);
565                 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
566                 input_abs_set_flat(dev, i, user_dev->absflat[i]);
567         }
568
569         retval = uinput_validate_absbits(dev);
570         if (retval < 0)
571                 goto exit;
572
573         udev->state = UIST_SETUP_COMPLETE;
574         retval = count;
575
576  exit:
577         kfree(user_dev);
578         return retval;
579 }
580
581 static ssize_t uinput_inject_events(struct uinput_device *udev,
582                                     const char __user *buffer, size_t count)
583 {
584         struct input_event ev;
585         size_t bytes = 0;
586
587         if (count != 0 && count < input_event_size())
588                 return -EINVAL;
589
590         while (bytes + input_event_size() <= count) {
591                 /*
592                  * Note that even if some events were fetched successfully
593                  * we are still going to return EFAULT instead of partial
594                  * count to let userspace know that it got it's buffers
595                  * all wrong.
596                  */
597                 if (input_event_from_user(buffer + bytes, &ev))
598                         return -EFAULT;
599
600                 input_event(udev->dev, ev.type, ev.code, ev.value);
601                 bytes += input_event_size();
602                 cond_resched();
603         }
604
605         return bytes;
606 }
607
608 static ssize_t uinput_write(struct file *file, const char __user *buffer,
609                             size_t count, loff_t *ppos)
610 {
611         struct uinput_device *udev = file->private_data;
612         int retval;
613
614         if (count == 0)
615                 return 0;
616
617         retval = mutex_lock_interruptible(&udev->mutex);
618         if (retval)
619                 return retval;
620
621         retval = udev->state == UIST_CREATED ?
622                         uinput_inject_events(udev, buffer, count) :
623                         uinput_setup_device_legacy(udev, buffer, count);
624
625         mutex_unlock(&udev->mutex);
626
627         return retval;
628 }
629
630 static bool uinput_fetch_next_event(struct uinput_device *udev,
631                                     struct input_event *event)
632 {
633         bool have_event;
634
635         spin_lock_irq(&udev->dev->event_lock);
636
637         have_event = udev->head != udev->tail;
638         if (have_event) {
639                 *event = udev->buff[udev->tail];
640                 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
641         }
642
643         spin_unlock_irq(&udev->dev->event_lock);
644
645         return have_event;
646 }
647
648 static ssize_t uinput_events_to_user(struct uinput_device *udev,
649                                      char __user *buffer, size_t count)
650 {
651         struct input_event event;
652         size_t read = 0;
653
654         while (read + input_event_size() <= count &&
655                uinput_fetch_next_event(udev, &event)) {
656
657                 if (input_event_to_user(buffer + read, &event))
658                         return -EFAULT;
659
660                 read += input_event_size();
661         }
662
663         return read;
664 }
665
666 static ssize_t uinput_read(struct file *file, char __user *buffer,
667                            size_t count, loff_t *ppos)
668 {
669         struct uinput_device *udev = file->private_data;
670         ssize_t retval;
671
672         if (count != 0 && count < input_event_size())
673                 return -EINVAL;
674
675         do {
676                 retval = mutex_lock_interruptible(&udev->mutex);
677                 if (retval)
678                         return retval;
679
680                 if (udev->state != UIST_CREATED)
681                         retval = -ENODEV;
682                 else if (udev->head == udev->tail &&
683                          (file->f_flags & O_NONBLOCK))
684                         retval = -EAGAIN;
685                 else
686                         retval = uinput_events_to_user(udev, buffer, count);
687
688                 mutex_unlock(&udev->mutex);
689
690                 if (retval || count == 0)
691                         break;
692
693                 if (!(file->f_flags & O_NONBLOCK))
694                         retval = wait_event_interruptible(udev->waitq,
695                                                   udev->head != udev->tail ||
696                                                   udev->state != UIST_CREATED);
697         } while (retval == 0);
698
699         return retval;
700 }
701
702 static __poll_t uinput_poll(struct file *file, poll_table *wait)
703 {
704         struct uinput_device *udev = file->private_data;
705
706         poll_wait(file, &udev->waitq, wait);
707
708         if (udev->head != udev->tail)
709                 return EPOLLIN | EPOLLRDNORM;
710
711         return 0;
712 }
713
714 static int uinput_release(struct inode *inode, struct file *file)
715 {
716         struct uinput_device *udev = file->private_data;
717
718         uinput_destroy_device(udev);
719         kfree(udev);
720
721         return 0;
722 }
723
724 #ifdef CONFIG_COMPAT
725 struct uinput_ff_upload_compat {
726         __u32                   request_id;
727         __s32                   retval;
728         struct ff_effect_compat effect;
729         struct ff_effect_compat old;
730 };
731
732 static int uinput_ff_upload_to_user(char __user *buffer,
733                                     const struct uinput_ff_upload *ff_up)
734 {
735         if (in_compat_syscall()) {
736                 struct uinput_ff_upload_compat ff_up_compat;
737
738                 ff_up_compat.request_id = ff_up->request_id;
739                 ff_up_compat.retval = ff_up->retval;
740                 /*
741                  * It so happens that the pointer that gives us the trouble
742                  * is the last field in the structure. Since we don't support
743                  * custom waveforms in uinput anyway we can just copy the whole
744                  * thing (to the compat size) and ignore the pointer.
745                  */
746                 memcpy(&ff_up_compat.effect, &ff_up->effect,
747                         sizeof(struct ff_effect_compat));
748                 memcpy(&ff_up_compat.old, &ff_up->old,
749                         sizeof(struct ff_effect_compat));
750
751                 if (copy_to_user(buffer, &ff_up_compat,
752                                  sizeof(struct uinput_ff_upload_compat)))
753                         return -EFAULT;
754         } else {
755                 if (copy_to_user(buffer, ff_up,
756                                  sizeof(struct uinput_ff_upload)))
757                         return -EFAULT;
758         }
759
760         return 0;
761 }
762
763 static int uinput_ff_upload_from_user(const char __user *buffer,
764                                       struct uinput_ff_upload *ff_up)
765 {
766         if (in_compat_syscall()) {
767                 struct uinput_ff_upload_compat ff_up_compat;
768
769                 if (copy_from_user(&ff_up_compat, buffer,
770                                    sizeof(struct uinput_ff_upload_compat)))
771                         return -EFAULT;
772
773                 ff_up->request_id = ff_up_compat.request_id;
774                 ff_up->retval = ff_up_compat.retval;
775                 memcpy(&ff_up->effect, &ff_up_compat.effect,
776                         sizeof(struct ff_effect_compat));
777                 memcpy(&ff_up->old, &ff_up_compat.old,
778                         sizeof(struct ff_effect_compat));
779
780         } else {
781                 if (copy_from_user(ff_up, buffer,
782                                    sizeof(struct uinput_ff_upload)))
783                         return -EFAULT;
784         }
785
786         return 0;
787 }
788
789 #else
790
791 static int uinput_ff_upload_to_user(char __user *buffer,
792                                     const struct uinput_ff_upload *ff_up)
793 {
794         if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
795                 return -EFAULT;
796
797         return 0;
798 }
799
800 static int uinput_ff_upload_from_user(const char __user *buffer,
801                                       struct uinput_ff_upload *ff_up)
802 {
803         if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
804                 return -EFAULT;
805
806         return 0;
807 }
808
809 #endif
810
811 #define uinput_set_bit(_arg, _bit, _max)                \
812 ({                                                      \
813         int __ret = 0;                                  \
814         if (udev->state == UIST_CREATED)                \
815                 __ret =  -EINVAL;                       \
816         else if ((_arg) > (_max))                       \
817                 __ret = -EINVAL;                        \
818         else set_bit((_arg), udev->dev->_bit);          \
819         __ret;                                          \
820 })
821
822 static int uinput_str_to_user(void __user *dest, const char *str,
823                               unsigned int maxlen)
824 {
825         char __user *p = dest;
826         int len, ret;
827
828         if (!str)
829                 return -ENOENT;
830
831         if (maxlen == 0)
832                 return -EINVAL;
833
834         len = strlen(str) + 1;
835         if (len > maxlen)
836                 len = maxlen;
837
838         ret = copy_to_user(p, str, len);
839         if (ret)
840                 return -EFAULT;
841
842         /* force terminating '\0' */
843         ret = put_user(0, p + len - 1);
844         return ret ? -EFAULT : len;
845 }
846
847 static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
848                                  unsigned long arg, void __user *p)
849 {
850         int                     retval;
851         struct uinput_device    *udev = file->private_data;
852         struct uinput_ff_upload ff_up;
853         struct uinput_ff_erase  ff_erase;
854         struct uinput_request   *req;
855         char                    *phys;
856         const char              *name;
857         unsigned int            size;
858
859         retval = mutex_lock_interruptible(&udev->mutex);
860         if (retval)
861                 return retval;
862
863         if (!udev->dev) {
864                 udev->dev = input_allocate_device();
865                 if (!udev->dev) {
866                         retval = -ENOMEM;
867                         goto out;
868                 }
869         }
870
871         switch (cmd) {
872         case UI_GET_VERSION:
873                 if (put_user(UINPUT_VERSION, (unsigned int __user *)p))
874                         retval = -EFAULT;
875                 goto out;
876
877         case UI_DEV_CREATE:
878                 retval = uinput_create_device(udev);
879                 goto out;
880
881         case UI_DEV_DESTROY:
882                 uinput_destroy_device(udev);
883                 goto out;
884
885         case UI_DEV_SETUP:
886                 retval = uinput_dev_setup(udev, p);
887                 goto out;
888
889         /* UI_ABS_SETUP is handled in the variable size ioctls */
890
891         case UI_SET_EVBIT:
892                 retval = uinput_set_bit(arg, evbit, EV_MAX);
893                 goto out;
894
895         case UI_SET_KEYBIT:
896                 retval = uinput_set_bit(arg, keybit, KEY_MAX);
897                 goto out;
898
899         case UI_SET_RELBIT:
900                 retval = uinput_set_bit(arg, relbit, REL_MAX);
901                 goto out;
902
903         case UI_SET_ABSBIT:
904                 retval = uinput_set_bit(arg, absbit, ABS_MAX);
905                 goto out;
906
907         case UI_SET_MSCBIT:
908                 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
909                 goto out;
910
911         case UI_SET_LEDBIT:
912                 retval = uinput_set_bit(arg, ledbit, LED_MAX);
913                 goto out;
914
915         case UI_SET_SNDBIT:
916                 retval = uinput_set_bit(arg, sndbit, SND_MAX);
917                 goto out;
918
919         case UI_SET_FFBIT:
920                 retval = uinput_set_bit(arg, ffbit, FF_MAX);
921                 goto out;
922
923         case UI_SET_SWBIT:
924                 retval = uinput_set_bit(arg, swbit, SW_MAX);
925                 goto out;
926
927         case UI_SET_PROPBIT:
928                 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
929                 goto out;
930
931         case UI_SET_PHYS:
932                 if (udev->state == UIST_CREATED) {
933                         retval = -EINVAL;
934                         goto out;
935                 }
936
937                 phys = strndup_user(p, 1024);
938                 if (IS_ERR(phys)) {
939                         retval = PTR_ERR(phys);
940                         goto out;
941                 }
942
943                 kfree(udev->dev->phys);
944                 udev->dev->phys = phys;
945                 goto out;
946
947         case UI_BEGIN_FF_UPLOAD:
948                 retval = uinput_ff_upload_from_user(p, &ff_up);
949                 if (retval)
950                         goto out;
951
952                 req = uinput_request_find(udev, ff_up.request_id);
953                 if (!req || req->code != UI_FF_UPLOAD ||
954                     !req->u.upload.effect) {
955                         retval = -EINVAL;
956                         goto out;
957                 }
958
959                 ff_up.retval = 0;
960                 ff_up.effect = *req->u.upload.effect;
961                 if (req->u.upload.old)
962                         ff_up.old = *req->u.upload.old;
963                 else
964                         memset(&ff_up.old, 0, sizeof(struct ff_effect));
965
966                 retval = uinput_ff_upload_to_user(p, &ff_up);
967                 goto out;
968
969         case UI_BEGIN_FF_ERASE:
970                 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
971                         retval = -EFAULT;
972                         goto out;
973                 }
974
975                 req = uinput_request_find(udev, ff_erase.request_id);
976                 if (!req || req->code != UI_FF_ERASE) {
977                         retval = -EINVAL;
978                         goto out;
979                 }
980
981                 ff_erase.retval = 0;
982                 ff_erase.effect_id = req->u.effect_id;
983                 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
984                         retval = -EFAULT;
985                         goto out;
986                 }
987
988                 goto out;
989
990         case UI_END_FF_UPLOAD:
991                 retval = uinput_ff_upload_from_user(p, &ff_up);
992                 if (retval)
993                         goto out;
994
995                 req = uinput_request_find(udev, ff_up.request_id);
996                 if (!req || req->code != UI_FF_UPLOAD ||
997                     !req->u.upload.effect) {
998                         retval = -EINVAL;
999                         goto out;
1000                 }
1001
1002                 req->retval = ff_up.retval;
1003                 complete(&req->done);
1004                 goto out;
1005
1006         case UI_END_FF_ERASE:
1007                 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
1008                         retval = -EFAULT;
1009                         goto out;
1010                 }
1011
1012                 req = uinput_request_find(udev, ff_erase.request_id);
1013                 if (!req || req->code != UI_FF_ERASE) {
1014                         retval = -EINVAL;
1015                         goto out;
1016                 }
1017
1018                 req->retval = ff_erase.retval;
1019                 complete(&req->done);
1020                 goto out;
1021         }
1022
1023         size = _IOC_SIZE(cmd);
1024
1025         /* Now check variable-length commands */
1026         switch (cmd & ~IOCSIZE_MASK) {
1027         case UI_GET_SYSNAME(0):
1028                 if (udev->state != UIST_CREATED) {
1029                         retval = -ENOENT;
1030                         goto out;
1031                 }
1032                 name = dev_name(&udev->dev->dev);
1033                 retval = uinput_str_to_user(p, name, size);
1034                 goto out;
1035
1036         case UI_ABS_SETUP & ~IOCSIZE_MASK:
1037                 retval = uinput_abs_setup(udev, p, size);
1038                 goto out;
1039         }
1040
1041         retval = -EINVAL;
1042  out:
1043         mutex_unlock(&udev->mutex);
1044         return retval;
1045 }
1046
1047 static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1048 {
1049         return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
1050 }
1051
1052 #ifdef CONFIG_COMPAT
1053
1054 /*
1055  * These IOCTLs change their size and thus their numbers between
1056  * 32 and 64 bits.
1057  */
1058 #define UI_SET_PHYS_COMPAT              \
1059         _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
1060 #define UI_BEGIN_FF_UPLOAD_COMPAT       \
1061         _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload_compat)
1062 #define UI_END_FF_UPLOAD_COMPAT         \
1063         _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload_compat)
1064
1065 static long uinput_compat_ioctl(struct file *file,
1066                                 unsigned int cmd, unsigned long arg)
1067 {
1068         switch (cmd) {
1069         case UI_SET_PHYS_COMPAT:
1070                 cmd = UI_SET_PHYS;
1071                 break;
1072         case UI_BEGIN_FF_UPLOAD_COMPAT:
1073                 cmd = UI_BEGIN_FF_UPLOAD;
1074                 break;
1075         case UI_END_FF_UPLOAD_COMPAT:
1076                 cmd = UI_END_FF_UPLOAD;
1077                 break;
1078         }
1079
1080         return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
1081 }
1082 #endif
1083
1084 static const struct file_operations uinput_fops = {
1085         .owner          = THIS_MODULE,
1086         .open           = uinput_open,
1087         .release        = uinput_release,
1088         .read           = uinput_read,
1089         .write          = uinput_write,
1090         .poll           = uinput_poll,
1091         .unlocked_ioctl = uinput_ioctl,
1092 #ifdef CONFIG_COMPAT
1093         .compat_ioctl   = uinput_compat_ioctl,
1094 #endif
1095         .llseek         = no_llseek,
1096 };
1097
1098 static struct miscdevice uinput_misc = {
1099         .fops           = &uinput_fops,
1100         .minor          = UINPUT_MINOR,
1101         .name           = UINPUT_NAME,
1102 };
1103 module_misc_device(uinput_misc);
1104
1105 MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
1106 MODULE_ALIAS("devname:" UINPUT_NAME);
1107
1108 MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
1109 MODULE_DESCRIPTION("User level driver support for input subsystem");
1110 MODULE_LICENSE("GPL");