blob: 84051f20b18a7790fea756c76f00d6b522010f71 [file] [log] [blame]
Thomas Gleixner1a59d1b82019-05-27 08:55:05 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * User level driver support for input subsystem
4 *
5 * Heavily based on evdev.c by Vojtech Pavlik
6 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
8 *
9 * Changes/Revisions:
Benjamin Tissoirese3480a62014-01-30 17:20:24 -080010 * 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
11 * - add UI_GET_SYSNAME ioctl
Anssi Hannulaff462552006-07-19 01:41:09 -040012 * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
13 * - updated ff support for the changes in kernel interface
14 * - added MODULE_VERSION
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
16 * - added force feedback support
17 * - added UI_SET_PHYS
18 * 0.1 20/06/2002
19 * - first public version
20 */
Dmitry Torokhova11bc4762017-09-04 12:19:07 -070021#include <uapi/linux/uinput.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/poll.h>
Alexey Dobriyana99bbaf2009-10-04 16:11:37 +040023#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/slab.h>
25#include <linux/module.h>
26#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/fs.h>
28#include <linux/miscdevice.h>
Dmitry Torokhovd77651a2019-01-14 13:54:55 -080029#include <linux/overflow.h>
Henrik Rydberg47c78e82010-11-27 09:16:48 +010030#include <linux/input/mt.h>
Philip Langdale2d56f3a2008-10-16 22:31:42 -040031#include "../input-compat.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Dmitry Torokhova11bc4762017-09-04 12:19:07 -070033#define UINPUT_NAME "uinput"
34#define UINPUT_BUFFER_SIZE 16
35#define UINPUT_NUM_REQUESTS 16
36
37enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };
38
39struct uinput_request {
40 unsigned int id;
41 unsigned int code; /* UI_FF_UPLOAD, UI_FF_ERASE */
42
43 int retval;
44 struct completion done;
45
46 union {
47 unsigned int effect_id;
48 struct {
49 struct ff_effect *effect;
50 struct ff_effect *old;
51 } upload;
52 } u;
53};
54
55struct uinput_device {
56 struct input_dev *dev;
57 struct mutex mutex;
58 enum uinput_state state;
59 wait_queue_head_t waitq;
60 unsigned char ready;
61 unsigned char head;
62 unsigned char tail;
63 struct input_event buff[UINPUT_BUFFER_SIZE];
64 unsigned int ff_effects_max;
65
66 struct uinput_request *requests[UINPUT_NUM_REQUESTS];
67 wait_queue_head_t requests_waitq;
68 spinlock_t requests_lock;
69};
70
Dmitry Torokhov54ce1652012-07-29 22:48:32 -070071static int uinput_dev_event(struct input_dev *dev,
72 unsigned int type, unsigned int code, int value)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
Dmitry Torokhov373f9712007-04-12 01:34:33 -040074 struct uinput_device *udev = input_get_drvdata(dev);
Deepa Dinamanib3495cec2018-01-01 22:27:11 -080075 struct timespec64 ts;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77 udev->buff[udev->head].type = type;
78 udev->buff[udev->head].code = code;
79 udev->buff[udev->head].value = value;
Deepa Dinamanib3495cec2018-01-01 22:27:11 -080080 ktime_get_ts64(&ts);
Deepa Dinamani152194f2018-01-07 17:44:42 -080081 udev->buff[udev->head].input_event_sec = ts.tv_sec;
82 udev->buff[udev->head].input_event_usec = ts.tv_nsec / NSEC_PER_USEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
84
85 wake_up_interruptible(&udev->waitq);
86
87 return 0;
88}
89
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -070090/* Atomically allocate an ID for the given request. Returns 0 on success. */
Dmitry Torokhov00ce7562012-07-29 22:48:32 -070091static bool uinput_request_alloc_id(struct uinput_device *udev,
92 struct uinput_request *request)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
Dmitry Torokhovc5b35332012-07-29 22:48:32 -070094 unsigned int id;
Dmitry Torokhov00ce7562012-07-29 22:48:32 -070095 bool reserved = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Dmitry Torokhov0048e602005-06-30 00:48:14 -050097 spin_lock(&udev->requests_lock);
Dmitry Torokhov152c12f2005-06-30 00:47:50 -050098
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -070099 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 if (!udev->requests[id]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 request->id = id;
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500102 udev->requests[id] = request;
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700103 reserved = true;
Dmitry Torokhov152c12f2005-06-30 00:47:50 -0500104 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 }
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700106 }
Dmitry Torokhov152c12f2005-06-30 00:47:50 -0500107
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500108 spin_unlock(&udev->requests_lock);
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700109 return reserved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
111
Dmitry Torokhovc5b35332012-07-29 22:48:32 -0700112static struct uinput_request *uinput_request_find(struct uinput_device *udev,
113 unsigned int id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
115 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
Dmitry Torokhovc5b35332012-07-29 22:48:32 -0700116 if (id >= UINPUT_NUM_REQUESTS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 return NULL;
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 return udev->requests[id];
120}
121
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700122static int uinput_request_reserve_slot(struct uinput_device *udev,
123 struct uinput_request *request)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500125 /* Allocate slot. If none are available right away, wait. */
126 return wait_event_interruptible(udev->requests_waitq,
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700127 uinput_request_alloc_id(udev, request));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
129
Dmitry Torokhov6b4877c72017-09-06 16:22:59 -0700130static void uinput_request_release_slot(struct uinput_device *udev,
131 unsigned int id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500133 /* Mark slot as available */
Dmitry Torokhov6b4877c72017-09-06 16:22:59 -0700134 spin_lock(&udev->requests_lock);
135 udev->requests[id] = NULL;
136 spin_unlock(&udev->requests_lock);
Dmitry Torokhove7507ed2005-10-17 16:43:32 -0700137
Dmitry Torokhov6b4877c72017-09-06 16:22:59 -0700138 wake_up(&udev->requests_waitq);
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500139}
140
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700141static int uinput_request_send(struct uinput_device *udev,
142 struct uinput_request *request)
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500143{
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700144 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700146 retval = mutex_lock_interruptible(&udev->mutex);
147 if (retval)
148 return retval;
149
150 if (udev->state != UIST_CREATED) {
151 retval = -ENODEV;
152 goto out;
153 }
154
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700155 init_completion(&request->done);
156
157 /*
158 * Tell our userspace application about this new request
159 * by queueing an input event.
160 */
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700161 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
162
163 out:
164 mutex_unlock(&udev->mutex);
165 return retval;
166}
167
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700168static int uinput_request_submit(struct uinput_device *udev,
169 struct uinput_request *request)
170{
Dmitry Torokhov6b4877c72017-09-06 16:22:59 -0700171 int retval;
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700172
Dmitry Torokhov6b4877c72017-09-06 16:22:59 -0700173 retval = uinput_request_reserve_slot(udev, request);
174 if (retval)
175 return retval;
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700176
Dmitry Torokhov6b4877c72017-09-06 16:22:59 -0700177 retval = uinput_request_send(udev, request);
178 if (retval)
179 goto out;
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700180
Dmitry Torokhov8e009112017-09-06 16:31:29 -0700181 if (!wait_for_completion_timeout(&request->done, 30 * HZ)) {
182 retval = -ETIMEDOUT;
183 goto out;
184 }
185
Dmitry Torokhov6b4877c72017-09-06 16:22:59 -0700186 retval = request->retval;
187
188 out:
189 uinput_request_release_slot(udev, request->id);
190 return retval;
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700191}
192
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700193/*
Dmitry Torokhov54ce1652012-07-29 22:48:32 -0700194 * Fail all outstanding requests so handlers don't wait for the userspace
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700195 * to finish processing them.
196 */
197static void uinput_flush_requests(struct uinput_device *udev)
198{
199 struct uinput_request *request;
200 int i;
201
202 spin_lock(&udev->requests_lock);
203
204 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
205 request = udev->requests[i];
206 if (request) {
207 request->retval = -ENODEV;
Dmitry Torokhov6b4877c72017-09-06 16:22:59 -0700208 complete(&request->done);
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700209 }
210 }
211
212 spin_unlock(&udev->requests_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213}
214
Anssi Hannulaff462552006-07-19 01:41:09 -0400215static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
216{
217 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
218}
219
220static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
221{
222 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
223}
224
225static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
226{
227 return uinput_dev_event(dev, EV_FF, effect_id, value);
228}
229
Dmitry Torokhov54ce1652012-07-29 22:48:32 -0700230static int uinput_dev_upload_effect(struct input_dev *dev,
231 struct ff_effect *effect,
232 struct ff_effect *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233{
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700234 struct uinput_device *udev = input_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 struct uinput_request request;
236
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400237 /*
238 * uinput driver does not currently support periodic effects with
239 * custom waveform since it does not have a way to pass buffer of
240 * samples (custom_data) to userspace. If ever there is a device
241 * supporting custom waveforms we would need to define an additional
242 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
243 */
244 if (effect->type == FF_PERIODIC &&
245 effect->u.periodic.waveform == FF_CUSTOM)
246 return -EINVAL;
247
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500248 request.code = UI_FF_UPLOAD;
Anssi Hannulaff462552006-07-19 01:41:09 -0400249 request.u.upload.effect = effect;
250 request.u.upload.old = old;
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500251
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700252 return uinput_request_submit(udev, &request);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
255static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
256{
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700257 struct uinput_device *udev = input_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 struct uinput_request request;
259
260 if (!test_bit(EV_FF, dev->evbit))
261 return -ENOSYS;
262
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500263 request.code = UI_FF_ERASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 request.u.effect_id = effect_id;
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500265
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700266 return uinput_request_submit(udev, &request);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267}
268
Dmitry Torokhove8b95722017-09-01 17:13:43 -0700269static int uinput_dev_flush(struct input_dev *dev, struct file *file)
270{
271 /*
272 * If we are called with file == NULL that means we are tearing
273 * down the device, and therefore we can not handle FF erase
274 * requests: either we are handling UI_DEV_DESTROY (and holding
275 * the udev->mutex), or the file descriptor is closed and there is
276 * nobody on the other side anymore.
277 */
278 return file ? input_ff_flush(dev, file) : 0;
279}
280
Dmitry Torokhov29506412005-11-20 00:51:22 -0500281static void uinput_destroy_device(struct uinput_device *udev)
282{
283 const char *name, *phys;
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700284 struct input_dev *dev = udev->dev;
285 enum uinput_state old_state = udev->state;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500286
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700287 udev->state = UIST_NEW_DEVICE;
288
289 if (dev) {
290 name = dev->name;
291 phys = dev->phys;
292 if (old_state == UIST_CREATED) {
293 uinput_flush_requests(udev);
294 input_unregister_device(dev);
295 } else {
296 input_free_device(dev);
297 }
Dmitry Torokhov29506412005-11-20 00:51:22 -0500298 kfree(name);
299 kfree(phys);
300 udev->dev = NULL;
301 }
Dmitry Torokhov29506412005-11-20 00:51:22 -0500302}
303
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304static int uinput_create_device(struct uinput_device *udev)
305{
Anssi Hannulaff462552006-07-19 01:41:09 -0400306 struct input_dev *dev = udev->dev;
David Herrmannfbae10d2015-10-25 10:34:13 +0100307 int error, nslot;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500308
309 if (udev->state != UIST_SETUP_COMPLETE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
311 return -EINVAL;
312 }
313
Dmitry Torokhov601bbbe2017-01-31 14:56:43 -0800314 if (test_bit(EV_ABS, dev->evbit)) {
315 input_alloc_absinfo(dev);
316 if (!dev->absinfo) {
317 error = -EINVAL;
David Herrmannfbae10d2015-10-25 10:34:13 +0100318 goto fail1;
Dmitry Torokhov601bbbe2017-01-31 14:56:43 -0800319 }
320
321 if (test_bit(ABS_MT_SLOT, dev->absbit)) {
322 nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
323 error = input_mt_init_slots(dev, nslot, 0);
324 if (error)
325 goto fail1;
326 } else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
327 input_set_events_per_packet(dev, 60);
328 }
David Herrmannfbae10d2015-10-25 10:34:13 +0100329 }
330
Elias Vanderstuyftdaf6cd02015-12-18 17:32:19 -0800331 if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) {
332 printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n",
333 UINPUT_NAME);
334 error = -EINVAL;
335 goto fail1;
336 }
337
Anssi Hannulaff462552006-07-19 01:41:09 -0400338 if (udev->ff_effects_max) {
339 error = input_ff_create(dev, udev->ff_effects_max);
340 if (error)
341 goto fail1;
342
343 dev->ff->upload = uinput_dev_upload_effect;
344 dev->ff->erase = uinput_dev_erase_effect;
345 dev->ff->playback = uinput_dev_playback;
346 dev->ff->set_gain = uinput_dev_set_gain;
347 dev->ff->set_autocenter = uinput_dev_set_autocenter;
Dmitry Torokhove8b95722017-09-01 17:13:43 -0700348 /*
349 * The standard input_ff_flush() implementation does
350 * not quite work for uinput as we can't reasonably
351 * handle FF requests during device teardown.
352 */
353 dev->flush = uinput_dev_flush;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 }
355
Dmitry Torokhov04ce40a2017-09-06 16:42:26 -0700356 dev->event = uinput_dev_event;
357
358 input_set_drvdata(udev->dev, udev);
359
Anssi Hannulaff462552006-07-19 01:41:09 -0400360 error = input_register_device(udev->dev);
361 if (error)
362 goto fail2;
363
Dmitry Torokhov29506412005-11-20 00:51:22 -0500364 udev->state = UIST_CREATED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
366 return 0;
Anssi Hannulaff462552006-07-19 01:41:09 -0400367
368 fail2: input_ff_destroy(dev);
369 fail1: uinput_destroy_device(udev);
370 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371}
372
373static int uinput_open(struct inode *inode, struct file *file)
374{
Dmitry Torokhov29506412005-11-20 00:51:22 -0500375 struct uinput_device *newdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376
Dmitry Torokhov29506412005-11-20 00:51:22 -0500377 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 if (!newdev)
Dmitry Torokhov29506412005-11-20 00:51:22 -0500379 return -ENOMEM;
380
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500381 mutex_init(&newdev->mutex);
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500382 spin_lock_init(&newdev->requests_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 init_waitqueue_head(&newdev->requests_waitq);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500384 init_waitqueue_head(&newdev->waitq);
385 newdev->state = UIST_NEW_DEVICE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
387 file->private_data = newdev;
Kirill Smelkovc5bf68f2019-03-26 23:51:19 +0300388 stream_open(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391}
392
David Herrmannfbae10d2015-10-25 10:34:13 +0100393static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
394 const struct input_absinfo *abs)
395{
Dmitry Torokhovd77651a2019-01-14 13:54:55 -0800396 int min, max, range;
David Herrmannfbae10d2015-10-25 10:34:13 +0100397
398 min = abs->minimum;
399 max = abs->maximum;
400
Peter Hutterer4fef1252018-09-18 09:53:32 -0700401 if ((min != 0 || max != 0) && max < min) {
David Herrmannfbae10d2015-10-25 10:34:13 +0100402 printk(KERN_DEBUG
403 "%s: invalid abs[%02x] min:%d max:%d\n",
404 UINPUT_NAME, code, min, max);
405 return -EINVAL;
406 }
407
Dmitry Torokhovd77651a2019-01-14 13:54:55 -0800408 if (!check_sub_overflow(max, min, &range) && abs->flat > range) {
David Herrmannfbae10d2015-10-25 10:34:13 +0100409 printk(KERN_DEBUG
410 "%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
411 UINPUT_NAME, code, abs->flat, min, max);
412 return -EINVAL;
413 }
414
415 return 0;
416}
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418static int uinput_validate_absbits(struct input_dev *dev)
419{
420 unsigned int cnt;
David Herrmannfbae10d2015-10-25 10:34:13 +0100421 int error;
David Herrmannbcb898e2014-07-20 17:16:23 -0700422
423 if (!test_bit(EV_ABS, dev->evbit))
424 return 0;
425
426 /*
427 * Check if absmin/absmax/absfuzz/absflat are sane.
428 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Anshul Gargb6d30962015-07-09 10:18:22 -0700430 for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
David Herrmannfbae10d2015-10-25 10:34:13 +0100431 if (!dev->absinfo)
David Herrmannbcb898e2014-07-20 17:16:23 -0700432 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
David Herrmannfbae10d2015-10-25 10:34:13 +0100434 error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
435 if (error)
436 return error;
David Herrmannbcb898e2014-07-20 17:16:23 -0700437 }
438
439 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
441
Benjamin Tissoires052876f8e2015-12-18 17:20:09 -0800442static int uinput_dev_setup(struct uinput_device *udev,
443 struct uinput_setup __user *arg)
444{
445 struct uinput_setup setup;
446 struct input_dev *dev;
Benjamin Tissoires052876f8e2015-12-18 17:20:09 -0800447
448 if (udev->state == UIST_CREATED)
449 return -EINVAL;
450
451 if (copy_from_user(&setup, arg, sizeof(setup)))
452 return -EFAULT;
453
454 if (!setup.name[0])
455 return -EINVAL;
456
457 dev = udev->dev;
458 dev->id = setup.id;
459 udev->ff_effects_max = setup.ff_effects_max;
460
461 kfree(dev->name);
462 dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL);
463 if (!dev->name)
464 return -ENOMEM;
465
Benjamin Tissoires052876f8e2015-12-18 17:20:09 -0800466 udev->state = UIST_SETUP_COMPLETE;
467 return 0;
468}
469
470static int uinput_abs_setup(struct uinput_device *udev,
471 struct uinput_setup __user *arg, size_t size)
472{
473 struct uinput_abs_setup setup = {};
474 struct input_dev *dev;
David Herrmannfbae10d2015-10-25 10:34:13 +0100475 int error;
Benjamin Tissoires052876f8e2015-12-18 17:20:09 -0800476
477 if (size > sizeof(setup))
478 return -E2BIG;
479
480 if (udev->state == UIST_CREATED)
481 return -EINVAL;
482
483 if (copy_from_user(&setup, arg, size))
484 return -EFAULT;
485
486 if (setup.code > ABS_MAX)
487 return -ERANGE;
488
489 dev = udev->dev;
490
David Herrmannfbae10d2015-10-25 10:34:13 +0100491 error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
492 if (error)
493 return error;
494
Benjamin Tissoires052876f8e2015-12-18 17:20:09 -0800495 input_alloc_absinfo(dev);
496 if (!dev->absinfo)
497 return -ENOMEM;
498
499 set_bit(setup.code, dev->absbit);
500 dev->absinfo[setup.code] = setup.absinfo;
Benjamin Tissoires052876f8e2015-12-18 17:20:09 -0800501 return 0;
502}
503
504/* legacy setup via write() */
505static int uinput_setup_device_legacy(struct uinput_device *udev,
506 const char __user *buffer, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507{
508 struct uinput_user_dev *user_dev;
509 struct input_dev *dev;
David Herrmann5d9d6e92011-02-11 01:10:44 -0800510 int i;
Dmitry Torokhov152c12f2005-06-30 00:47:50 -0500511 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
Dmitry Torokhov29506412005-11-20 00:51:22 -0500513 if (count != sizeof(struct uinput_user_dev))
514 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
Dmitry Torokhov29506412005-11-20 00:51:22 -0500516 if (!udev->dev) {
Dmitry Torokhov04ce40a2017-09-06 16:42:26 -0700517 udev->dev = input_allocate_device();
518 if (!udev->dev)
519 return -ENOMEM;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500520 }
521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 dev = udev->dev;
523
Dmitry Torokhov4dfcc272011-02-11 01:10:45 -0800524 user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
Dan Carpenter163d2772011-02-18 08:30:52 -0800525 if (IS_ERR(user_dev))
Dmitry Torokhov4dfcc272011-02-11 01:10:45 -0800526 return PTR_ERR(user_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527
Anssi Hannulaff462552006-07-19 01:41:09 -0400528 udev->ff_effects_max = user_dev->ff_effects_max;
529
David Herrmann5d9d6e92011-02-11 01:10:44 -0800530 /* Ensure name is filled in */
531 if (!user_dev->name[0]) {
Dmitry Torokhov29506412005-11-20 00:51:22 -0500532 retval = -EINVAL;
533 goto exit;
534 }
535
536 kfree(dev->name);
David Herrmann5d9d6e92011-02-11 01:10:44 -0800537 dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
538 GFP_KERNEL);
539 if (!dev->name) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 retval = -ENOMEM;
541 goto exit;
542 }
543
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 dev->id.bustype = user_dev->id.bustype;
545 dev->id.vendor = user_dev->id.vendor;
546 dev->id.product = user_dev->id.product;
547 dev->id.version = user_dev->id.version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548
Dmitry Torokhov72d47362015-09-19 11:22:57 -0700549 for (i = 0; i < ABS_CNT; i++) {
Daniel Mack987a6c02010-08-02 20:15:17 -0700550 input_abs_set_max(dev, i, user_dev->absmax[i]);
551 input_abs_set_min(dev, i, user_dev->absmin[i]);
552 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
553 input_abs_set_flat(dev, i, user_dev->absflat[i]);
554 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
David Herrmannbcb898e2014-07-20 17:16:23 -0700556 retval = uinput_validate_absbits(dev);
557 if (retval < 0)
558 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Dmitry Torokhov29506412005-11-20 00:51:22 -0500560 udev->state = UIST_SETUP_COMPLETE;
561 retval = count;
562
563 exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 kfree(user_dev);
565 return retval;
566}
567
Ryan Malloncbf05412013-09-18 12:40:47 -0700568static ssize_t uinput_inject_events(struct uinput_device *udev,
569 const char __user *buffer, size_t count)
Dmitry Torokhov29506412005-11-20 00:51:22 -0500570{
571 struct input_event ev;
Ryan Malloncbf05412013-09-18 12:40:47 -0700572 size_t bytes = 0;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500573
Ryan Malloncbf05412013-09-18 12:40:47 -0700574 if (count != 0 && count < input_event_size())
Dmitry Torokhov29506412005-11-20 00:51:22 -0500575 return -EINVAL;
576
Ryan Malloncbf05412013-09-18 12:40:47 -0700577 while (bytes + input_event_size() <= count) {
578 /*
579 * Note that even if some events were fetched successfully
580 * we are still going to return EFAULT instead of partial
581 * count to let userspace know that it got it's buffers
582 * all wrong.
583 */
584 if (input_event_from_user(buffer + bytes, &ev))
585 return -EFAULT;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500586
Ryan Malloncbf05412013-09-18 12:40:47 -0700587 input_event(udev->dev, ev.type, ev.code, ev.value);
588 bytes += input_event_size();
Dmitry Torokhovcecf1072018-10-04 17:50:48 -0700589 cond_resched();
Ryan Malloncbf05412013-09-18 12:40:47 -0700590 }
Dmitry Torokhov29506412005-11-20 00:51:22 -0500591
Ryan Malloncbf05412013-09-18 12:40:47 -0700592 return bytes;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500593}
594
Dmitry Torokhov54ce1652012-07-29 22:48:32 -0700595static ssize_t uinput_write(struct file *file, const char __user *buffer,
596 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597{
598 struct uinput_device *udev = file->private_data;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500599 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700601 if (count == 0)
602 return 0;
603
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500604 retval = mutex_lock_interruptible(&udev->mutex);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500605 if (retval)
606 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
Dmitry Torokhov29506412005-11-20 00:51:22 -0500608 retval = udev->state == UIST_CREATED ?
Ryan Malloncbf05412013-09-18 12:40:47 -0700609 uinput_inject_events(udev, buffer, count) :
Benjamin Tissoires052876f8e2015-12-18 17:20:09 -0800610 uinput_setup_device_legacy(udev, buffer, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500612 mutex_unlock(&udev->mutex);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500613
614 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615}
616
Dmitry Torokhov929d1af2012-07-29 22:48:31 -0700617static bool uinput_fetch_next_event(struct uinput_device *udev,
618 struct input_event *event)
619{
620 bool have_event;
621
622 spin_lock_irq(&udev->dev->event_lock);
623
624 have_event = udev->head != udev->tail;
625 if (have_event) {
626 *event = udev->buff[udev->tail];
627 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
628 }
629
630 spin_unlock_irq(&udev->dev->event_lock);
631
632 return have_event;
633}
634
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700635static ssize_t uinput_events_to_user(struct uinput_device *udev,
636 char __user *buffer, size_t count)
637{
638 struct input_event event;
639 size_t read = 0;
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700640
641 while (read + input_event_size() <= count &&
642 uinput_fetch_next_event(udev, &event)) {
643
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700644 if (input_event_to_user(buffer + read, &event))
645 return -EFAULT;
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700646
647 read += input_event_size();
648 }
649
Dmitry Torokhov00ce7562012-07-29 22:48:32 -0700650 return read;
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700651}
652
653static ssize_t uinput_read(struct file *file, char __user *buffer,
654 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655{
656 struct uinput_device *udev = file->private_data;
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700657 ssize_t retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
David Herrmannf40033a2012-07-29 22:48:31 -0700659 if (count != 0 && count < input_event_size())
660 return -EINVAL;
661
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700662 do {
663 retval = mutex_lock_interruptible(&udev->mutex);
664 if (retval)
665 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700667 if (udev->state != UIST_CREATED)
668 retval = -ENODEV;
669 else if (udev->head == udev->tail &&
670 (file->f_flags & O_NONBLOCK))
671 retval = -EAGAIN;
672 else
673 retval = uinput_events_to_user(udev, buffer, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700675 mutex_unlock(&udev->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700677 if (retval || count == 0)
678 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
Dmitry Torokhov22ae19c2012-07-29 22:48:31 -0700680 if (!(file->f_flags & O_NONBLOCK))
681 retval = wait_event_interruptible(udev->waitq,
682 udev->head != udev->tail ||
683 udev->state != UIST_CREATED);
684 } while (retval == 0);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500685
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 return retval;
687}
688
Al Viroafc9a422017-07-03 06:39:46 -0400689static __poll_t uinput_poll(struct file *file, poll_table *wait)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690{
691 struct uinput_device *udev = file->private_data;
692
693 poll_wait(file, &udev->waitq, wait);
694
695 if (udev->head != udev->tail)
Linus Torvaldsa9a08842018-02-11 14:34:03 -0800696 return EPOLLIN | EPOLLRDNORM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
698 return 0;
699}
700
Dmitry Torokhov29506412005-11-20 00:51:22 -0500701static int uinput_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702{
Dmitry Torokhov29506412005-11-20 00:51:22 -0500703 struct uinput_device *udev = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Dmitry Torokhov29506412005-11-20 00:51:22 -0500705 uinput_destroy_device(udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 kfree(udev);
707
708 return 0;
709}
710
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400711#ifdef CONFIG_COMPAT
712struct uinput_ff_upload_compat {
Dmitry Torokhovc5b35332012-07-29 22:48:32 -0700713 __u32 request_id;
714 __s32 retval;
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400715 struct ff_effect_compat effect;
716 struct ff_effect_compat old;
717};
718
719static int uinput_ff_upload_to_user(char __user *buffer,
720 const struct uinput_ff_upload *ff_up)
721{
Andrew Mortonb8b4ead2016-03-25 14:20:47 -0700722 if (in_compat_syscall()) {
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400723 struct uinput_ff_upload_compat ff_up_compat;
724
725 ff_up_compat.request_id = ff_up->request_id;
726 ff_up_compat.retval = ff_up->retval;
727 /*
728 * It so happens that the pointer that gives us the trouble
729 * is the last field in the structure. Since we don't support
730 * custom waveforms in uinput anyway we can just copy the whole
731 * thing (to the compat size) and ignore the pointer.
732 */
733 memcpy(&ff_up_compat.effect, &ff_up->effect,
734 sizeof(struct ff_effect_compat));
735 memcpy(&ff_up_compat.old, &ff_up->old,
736 sizeof(struct ff_effect_compat));
737
738 if (copy_to_user(buffer, &ff_up_compat,
739 sizeof(struct uinput_ff_upload_compat)))
740 return -EFAULT;
741 } else {
742 if (copy_to_user(buffer, ff_up,
743 sizeof(struct uinput_ff_upload)))
744 return -EFAULT;
745 }
746
747 return 0;
748}
749
750static int uinput_ff_upload_from_user(const char __user *buffer,
751 struct uinput_ff_upload *ff_up)
752{
Andrew Mortonb8b4ead2016-03-25 14:20:47 -0700753 if (in_compat_syscall()) {
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400754 struct uinput_ff_upload_compat ff_up_compat;
755
756 if (copy_from_user(&ff_up_compat, buffer,
757 sizeof(struct uinput_ff_upload_compat)))
758 return -EFAULT;
759
760 ff_up->request_id = ff_up_compat.request_id;
761 ff_up->retval = ff_up_compat.retval;
762 memcpy(&ff_up->effect, &ff_up_compat.effect,
763 sizeof(struct ff_effect_compat));
764 memcpy(&ff_up->old, &ff_up_compat.old,
765 sizeof(struct ff_effect_compat));
766
767 } else {
768 if (copy_from_user(ff_up, buffer,
769 sizeof(struct uinput_ff_upload)))
770 return -EFAULT;
771 }
772
773 return 0;
774}
775
776#else
777
778static int uinput_ff_upload_to_user(char __user *buffer,
779 const struct uinput_ff_upload *ff_up)
780{
781 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
782 return -EFAULT;
783
784 return 0;
785}
786
787static int uinput_ff_upload_from_user(const char __user *buffer,
788 struct uinput_ff_upload *ff_up)
789{
790 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
791 return -EFAULT;
792
793 return 0;
794}
795
796#endif
797
Dmitry Torokhov29506412005-11-20 00:51:22 -0500798#define uinput_set_bit(_arg, _bit, _max) \
799({ \
800 int __ret = 0; \
801 if (udev->state == UIST_CREATED) \
802 __ret = -EINVAL; \
803 else if ((_arg) > (_max)) \
804 __ret = -EINVAL; \
805 else set_bit((_arg), udev->dev->_bit); \
806 __ret; \
807})
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
Benjamin Tissoirese3480a62014-01-30 17:20:24 -0800809static int uinput_str_to_user(void __user *dest, const char *str,
810 unsigned int maxlen)
811{
812 char __user *p = dest;
813 int len, ret;
814
815 if (!str)
816 return -ENOENT;
817
818 if (maxlen == 0)
819 return -EINVAL;
820
821 len = strlen(str) + 1;
822 if (len > maxlen)
823 len = maxlen;
824
825 ret = copy_to_user(p, str, len);
826 if (ret)
827 return -EFAULT;
828
829 /* force terminating '\0' */
830 ret = put_user(0, p + len - 1);
831 return ret ? -EFAULT : len;
832}
833
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400834static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
835 unsigned long arg, void __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836{
Dmitry Torokhov29506412005-11-20 00:51:22 -0500837 int retval;
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400838 struct uinput_device *udev = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 struct uinput_ff_upload ff_up;
840 struct uinput_ff_erase ff_erase;
841 struct uinput_request *req;
Dmitry Torokhov5b6271bd2005-06-30 00:50:38 -0500842 char *phys;
Benjamin Tissoirese3480a62014-01-30 17:20:24 -0800843 const char *name;
844 unsigned int size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500846 retval = mutex_lock_interruptible(&udev->mutex);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500847 if (retval)
848 return retval;
849
850 if (!udev->dev) {
Dmitry Torokhov04ce40a2017-09-06 16:42:26 -0700851 udev->dev = input_allocate_device();
Dan Carpenter781f2dd2017-11-10 10:21:53 -0800852 if (!udev->dev) {
853 retval = -ENOMEM;
854 goto out;
855 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 }
857
858 switch (cmd) {
Dmitry Torokhovc0661652017-09-06 16:34:31 -0700859 case UI_GET_VERSION:
860 if (put_user(UINPUT_VERSION, (unsigned int __user *)p))
861 retval = -EFAULT;
862 goto out;
863
864 case UI_DEV_CREATE:
865 retval = uinput_create_device(udev);
866 goto out;
867
868 case UI_DEV_DESTROY:
869 uinput_destroy_device(udev);
870 goto out;
871
872 case UI_DEV_SETUP:
873 retval = uinput_dev_setup(udev, p);
874 goto out;
875
876 /* UI_ABS_SETUP is handled in the variable size ioctls */
877
878 case UI_SET_EVBIT:
879 retval = uinput_set_bit(arg, evbit, EV_MAX);
880 goto out;
881
882 case UI_SET_KEYBIT:
883 retval = uinput_set_bit(arg, keybit, KEY_MAX);
884 goto out;
885
886 case UI_SET_RELBIT:
887 retval = uinput_set_bit(arg, relbit, REL_MAX);
888 goto out;
889
890 case UI_SET_ABSBIT:
891 retval = uinput_set_bit(arg, absbit, ABS_MAX);
892 goto out;
893
894 case UI_SET_MSCBIT:
895 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
896 goto out;
897
898 case UI_SET_LEDBIT:
899 retval = uinput_set_bit(arg, ledbit, LED_MAX);
900 goto out;
901
902 case UI_SET_SNDBIT:
903 retval = uinput_set_bit(arg, sndbit, SND_MAX);
904 goto out;
905
906 case UI_SET_FFBIT:
907 retval = uinput_set_bit(arg, ffbit, FF_MAX);
908 goto out;
909
910 case UI_SET_SWBIT:
911 retval = uinput_set_bit(arg, swbit, SW_MAX);
912 goto out;
913
914 case UI_SET_PROPBIT:
915 retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
916 goto out;
917
918 case UI_SET_PHYS:
919 if (udev->state == UIST_CREATED) {
920 retval = -EINVAL;
921 goto out;
922 }
923
924 phys = strndup_user(p, 1024);
925 if (IS_ERR(phys)) {
926 retval = PTR_ERR(phys);
927 goto out;
928 }
929
930 kfree(udev->dev->phys);
931 udev->dev->phys = phys;
932 goto out;
933
934 case UI_BEGIN_FF_UPLOAD:
935 retval = uinput_ff_upload_from_user(p, &ff_up);
936 if (retval)
David Herrmannba4e9a62014-07-20 17:27:09 -0700937 goto out;
938
Dmitry Torokhovc0661652017-09-06 16:34:31 -0700939 req = uinput_request_find(udev, ff_up.request_id);
940 if (!req || req->code != UI_FF_UPLOAD ||
941 !req->u.upload.effect) {
942 retval = -EINVAL;
943 goto out;
944 }
945
946 ff_up.retval = 0;
947 ff_up.effect = *req->u.upload.effect;
948 if (req->u.upload.old)
949 ff_up.old = *req->u.upload.old;
950 else
951 memset(&ff_up.old, 0, sizeof(struct ff_effect));
952
953 retval = uinput_ff_upload_to_user(p, &ff_up);
954 goto out;
955
956 case UI_BEGIN_FF_ERASE:
957 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
958 retval = -EFAULT;
959 goto out;
960 }
961
962 req = uinput_request_find(udev, ff_erase.request_id);
963 if (!req || req->code != UI_FF_ERASE) {
964 retval = -EINVAL;
965 goto out;
966 }
967
968 ff_erase.retval = 0;
969 ff_erase.effect_id = req->u.effect_id;
970 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
971 retval = -EFAULT;
972 goto out;
973 }
974
975 goto out;
976
977 case UI_END_FF_UPLOAD:
978 retval = uinput_ff_upload_from_user(p, &ff_up);
979 if (retval)
Benjamin Tisssoires9d51e802014-01-30 17:16:36 -0800980 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Dmitry Torokhovc0661652017-09-06 16:34:31 -0700982 req = uinput_request_find(udev, ff_up.request_id);
983 if (!req || req->code != UI_FF_UPLOAD ||
984 !req->u.upload.effect) {
985 retval = -EINVAL;
Benjamin Tisssoires9d51e802014-01-30 17:16:36 -0800986 goto out;
Dmitry Torokhovc0661652017-09-06 16:34:31 -0700987 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
Dmitry Torokhovc0661652017-09-06 16:34:31 -0700989 req->retval = ff_up.retval;
990 complete(&req->done);
991 goto out;
992
993 case UI_END_FF_ERASE:
994 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
995 retval = -EFAULT;
Benjamin Tissoires052876f8e2015-12-18 17:20:09 -0800996 goto out;
Dmitry Torokhovc0661652017-09-06 16:34:31 -0700997 }
Benjamin Tissoires052876f8e2015-12-18 17:20:09 -0800998
Dmitry Torokhovc0661652017-09-06 16:34:31 -0700999 req = uinput_request_find(udev, ff_erase.request_id);
1000 if (!req || req->code != UI_FF_ERASE) {
1001 retval = -EINVAL;
Benjamin Tisssoires9d51e802014-01-30 17:16:36 -08001002 goto out;
Dmitry Torokhovc0661652017-09-06 16:34:31 -07001003 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004
Dmitry Torokhovc0661652017-09-06 16:34:31 -07001005 req->retval = ff_erase.retval;
1006 complete(&req->done);
1007 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 }
Dmitry Torokhov29506412005-11-20 00:51:22 -05001009
Benjamin Tissoirese3480a62014-01-30 17:20:24 -08001010 size = _IOC_SIZE(cmd);
1011
1012 /* Now check variable-length commands */
1013 switch (cmd & ~IOCSIZE_MASK) {
1014 case UI_GET_SYSNAME(0):
1015 if (udev->state != UIST_CREATED) {
1016 retval = -ENOENT;
1017 goto out;
1018 }
1019 name = dev_name(&udev->dev->dev);
1020 retval = uinput_str_to_user(p, name, size);
1021 goto out;
Benjamin Tissoires052876f8e2015-12-18 17:20:09 -08001022
1023 case UI_ABS_SETUP & ~IOCSIZE_MASK:
1024 retval = uinput_abs_setup(udev, p, size);
1025 goto out;
Benjamin Tissoirese3480a62014-01-30 17:20:24 -08001026 }
1027
Benjamin Tisssoires9d51e802014-01-30 17:16:36 -08001028 retval = -EINVAL;
Dmitry Torokhov29506412005-11-20 00:51:22 -05001029 out:
Dmitry Torokhov221979a2006-02-19 00:22:36 -05001030 mutex_unlock(&udev->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 return retval;
1032}
1033
Philip Langdale2d56f3a2008-10-16 22:31:42 -04001034static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1035{
1036 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
1037}
1038
1039#ifdef CONFIG_COMPAT
Ricky Liangaffa80b2016-05-20 10:58:59 -07001040
Andrey Smirnov7c7da402019-05-23 12:55:26 -07001041/*
1042 * These IOCTLs change their size and thus their numbers between
1043 * 32 and 64 bits.
1044 */
1045#define UI_SET_PHYS_COMPAT \
1046 _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
1047#define UI_BEGIN_FF_UPLOAD_COMPAT \
1048 _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload_compat)
1049#define UI_END_FF_UPLOAD_COMPAT \
1050 _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload_compat)
Ricky Liangaffa80b2016-05-20 10:58:59 -07001051
Dmitry Torokhov54ce1652012-07-29 22:48:32 -07001052static long uinput_compat_ioctl(struct file *file,
1053 unsigned int cmd, unsigned long arg)
Philip Langdale2d56f3a2008-10-16 22:31:42 -04001054{
Andrey Smirnov7c7da402019-05-23 12:55:26 -07001055 switch (cmd) {
1056 case UI_SET_PHYS_COMPAT:
Ricky Liangaffa80b2016-05-20 10:58:59 -07001057 cmd = UI_SET_PHYS;
Andrey Smirnov7c7da402019-05-23 12:55:26 -07001058 break;
1059 case UI_BEGIN_FF_UPLOAD_COMPAT:
1060 cmd = UI_BEGIN_FF_UPLOAD;
1061 break;
1062 case UI_END_FF_UPLOAD_COMPAT:
1063 cmd = UI_END_FF_UPLOAD;
1064 break;
1065 }
Ricky Liangaffa80b2016-05-20 10:58:59 -07001066
Philip Langdale2d56f3a2008-10-16 22:31:42 -04001067 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
1068}
1069#endif
1070
Arjan van de Ven2b8693c2007-02-12 00:55:32 -08001071static const struct file_operations uinput_fops = {
Dmitry Torokhov29506412005-11-20 00:51:22 -05001072 .owner = THIS_MODULE,
1073 .open = uinput_open,
1074 .release = uinput_release,
1075 .read = uinput_read,
1076 .write = uinput_write,
1077 .poll = uinput_poll,
1078 .unlocked_ioctl = uinput_ioctl,
Philip Langdale2d56f3a2008-10-16 22:31:42 -04001079#ifdef CONFIG_COMPAT
1080 .compat_ioctl = uinput_compat_ioctl,
1081#endif
Arnd Bergmann6038f372010-08-15 18:52:59 +02001082 .llseek = no_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083};
1084
1085static struct miscdevice uinput_misc = {
Dmitry Torokhov29506412005-11-20 00:51:22 -05001086 .fops = &uinput_fops,
1087 .minor = UINPUT_MINOR,
1088 .name = UINPUT_NAME,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089};
PrasannaKumar Muralidharanca75d602016-08-25 22:30:49 +05301090module_misc_device(uinput_misc);
1091
Kay Sievers8905aaa2010-08-19 09:52:28 -07001092MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
1093MODULE_ALIAS("devname:" UINPUT_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
1096MODULE_DESCRIPTION("User level driver support for input subsystem");
1097MODULE_LICENSE("GPL");