blob: 0d4266a533a524564adcc85cc546736248753628 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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:
Anssi Hannulaff462552006-07-19 01:41:09 -040023 * 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
24 * - updated ff support for the changes in kernel interface
25 * - added MODULE_VERSION
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
27 * - added force feedback support
28 * - added UI_SET_PHYS
29 * 0.1 20/06/2002
30 * - first public version
31 */
32#include <linux/poll.h>
Alexey Dobriyana99bbaf2009-10-04 16:11:37 +040033#include <linux/sched.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/slab.h>
35#include <linux/module.h>
36#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/fs.h>
38#include <linux/miscdevice.h>
39#include <linux/uinput.h>
Philip Langdale2d56f3a2008-10-16 22:31:42 -040040#include "../input-compat.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Linus Torvalds1da177e2005-04-16 15:20:36 -070042static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
43{
Dmitry Torokhov373f9712007-04-12 01:34:33 -040044 struct uinput_device *udev = input_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46 udev->buff[udev->head].type = type;
47 udev->buff[udev->head].code = code;
48 udev->buff[udev->head].value = value;
49 do_gettimeofday(&udev->buff[udev->head].time);
50 udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
51
52 wake_up_interruptible(&udev->waitq);
53
54 return 0;
55}
56
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -070057/* Atomically allocate an ID for the given request. Returns 0 on success. */
Dmitry Torokhov0048e602005-06-30 00:48:14 -050058static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 int id;
Dmitry Torokhov152c12f2005-06-30 00:47:50 -050061 int err = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Dmitry Torokhov0048e602005-06-30 00:48:14 -050063 spin_lock(&udev->requests_lock);
Dmitry Torokhov152c12f2005-06-30 00:47:50 -050064
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -070065 for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 if (!udev->requests[id]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 request->id = id;
Dmitry Torokhov0048e602005-06-30 00:48:14 -050068 udev->requests[id] = request;
Dmitry Torokhov152c12f2005-06-30 00:47:50 -050069 err = 0;
70 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 }
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -070072 }
Dmitry Torokhov152c12f2005-06-30 00:47:50 -050073
Dmitry Torokhov0048e602005-06-30 00:48:14 -050074 spin_unlock(&udev->requests_lock);
Dmitry Torokhov152c12f2005-06-30 00:47:50 -050075 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076}
77
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -070078static struct uinput_request *uinput_request_find(struct uinput_device *udev, int id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079{
80 /* Find an input request, by ID. Returns NULL if the ID isn't valid. */
81 if (id >= UINPUT_NUM_REQUESTS || id < 0)
82 return NULL;
Philip Langdale2d56f3a2008-10-16 22:31:42 -040083
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 return udev->requests[id];
85}
86
Dmitry Torokhov0048e602005-06-30 00:48:14 -050087static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088{
Dmitry Torokhov0048e602005-06-30 00:48:14 -050089 /* Allocate slot. If none are available right away, wait. */
90 return wait_event_interruptible(udev->requests_waitq,
91 !uinput_request_alloc_id(udev, request));
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
Dmitry Torokhov0048e602005-06-30 00:48:14 -050094static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
Dmitry Torokhov0048e602005-06-30 00:48:14 -050096 /* Mark slot as available */
97 udev->requests[request->id] = NULL;
Dmitry Torokhove597f0c82005-11-20 00:51:43 -050098 wake_up(&udev->requests_waitq);
Dmitry Torokhove7507ed2005-10-17 16:43:32 -070099
100 complete(&request->done);
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500101}
102
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700103static int uinput_request_submit(struct uinput_device *udev, struct uinput_request *request)
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500104{
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700105 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700107 retval = uinput_request_reserve_slot(udev, request);
108 if (retval)
109 return retval;
110
111 retval = mutex_lock_interruptible(&udev->mutex);
112 if (retval)
113 return retval;
114
115 if (udev->state != UIST_CREATED) {
116 retval = -ENODEV;
117 goto out;
118 }
119
120 /* Tell our userspace app about this new request by queueing an input event */
121 uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
122
123 out:
124 mutex_unlock(&udev->mutex);
125 return retval;
126}
127
128/*
129 * Fail all ouitstanding requests so handlers don't wait for the userspace
130 * to finish processing them.
131 */
132static void uinput_flush_requests(struct uinput_device *udev)
133{
134 struct uinput_request *request;
135 int i;
136
137 spin_lock(&udev->requests_lock);
138
139 for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
140 request = udev->requests[i];
141 if (request) {
142 request->retval = -ENODEV;
143 uinput_request_done(udev, request);
144 }
145 }
146
147 spin_unlock(&udev->requests_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148}
149
Anssi Hannulaff462552006-07-19 01:41:09 -0400150static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
151{
152 uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
153}
154
155static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
156{
157 uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
158}
159
160static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
161{
162 return uinput_dev_event(dev, EV_FF, effect_id, value);
163}
164
165static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700167 struct uinput_device *udev = input_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 struct uinput_request request;
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500169 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400171 /*
172 * uinput driver does not currently support periodic effects with
173 * custom waveform since it does not have a way to pass buffer of
174 * samples (custom_data) to userspace. If ever there is a device
175 * supporting custom waveforms we would need to define an additional
176 * ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
177 */
178 if (effect->type == FF_PERIODIC &&
179 effect->u.periodic.waveform == FF_CUSTOM)
180 return -EINVAL;
181
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500182 request.id = -1;
183 init_completion(&request.done);
184 request.code = UI_FF_UPLOAD;
Anssi Hannulaff462552006-07-19 01:41:09 -0400185 request.u.upload.effect = effect;
186 request.u.upload.old = old;
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500187
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700188 retval = uinput_request_submit(udev, &request);
189 if (!retval) {
190 wait_for_completion(&request.done);
191 retval = request.retval;
192 }
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500193
194 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
197static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
198{
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700199 struct uinput_device *udev = input_get_drvdata(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 struct uinput_request request;
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500201 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 if (!test_bit(EV_FF, dev->evbit))
204 return -ENOSYS;
205
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500206 request.id = -1;
207 init_completion(&request.done);
208 request.code = UI_FF_ERASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 request.u.effect_id = effect_id;
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500210
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700211 retval = uinput_request_submit(udev, &request);
212 if (!retval) {
213 wait_for_completion(&request.done);
214 retval = request.retval;
215 }
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500216
217 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218}
219
Dmitry Torokhov29506412005-11-20 00:51:22 -0500220static void uinput_destroy_device(struct uinput_device *udev)
221{
222 const char *name, *phys;
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700223 struct input_dev *dev = udev->dev;
224 enum uinput_state old_state = udev->state;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500225
Aristeu Sergio Rozanski Filho05cebd32009-05-14 22:01:57 -0700226 udev->state = UIST_NEW_DEVICE;
227
228 if (dev) {
229 name = dev->name;
230 phys = dev->phys;
231 if (old_state == UIST_CREATED) {
232 uinput_flush_requests(udev);
233 input_unregister_device(dev);
234 } else {
235 input_free_device(dev);
236 }
Dmitry Torokhov29506412005-11-20 00:51:22 -0500237 kfree(name);
238 kfree(phys);
239 udev->dev = NULL;
240 }
Dmitry Torokhov29506412005-11-20 00:51:22 -0500241}
242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243static int uinput_create_device(struct uinput_device *udev)
244{
Anssi Hannulaff462552006-07-19 01:41:09 -0400245 struct input_dev *dev = udev->dev;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500246 int error;
247
248 if (udev->state != UIST_SETUP_COMPLETE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
250 return -EINVAL;
251 }
252
Anssi Hannulaff462552006-07-19 01:41:09 -0400253 if (udev->ff_effects_max) {
254 error = input_ff_create(dev, udev->ff_effects_max);
255 if (error)
256 goto fail1;
257
258 dev->ff->upload = uinput_dev_upload_effect;
259 dev->ff->erase = uinput_dev_erase_effect;
260 dev->ff->playback = uinput_dev_playback;
261 dev->ff->set_gain = uinput_dev_set_gain;
262 dev->ff->set_autocenter = uinput_dev_set_autocenter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 }
264
Anssi Hannulaff462552006-07-19 01:41:09 -0400265 error = input_register_device(udev->dev);
266 if (error)
267 goto fail2;
268
Dmitry Torokhov29506412005-11-20 00:51:22 -0500269 udev->state = UIST_CREATED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 return 0;
Anssi Hannulaff462552006-07-19 01:41:09 -0400272
273 fail2: input_ff_destroy(dev);
274 fail1: uinput_destroy_device(udev);
275 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276}
277
278static int uinput_open(struct inode *inode, struct file *file)
279{
Dmitry Torokhov29506412005-11-20 00:51:22 -0500280 struct uinput_device *newdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
Dmitry Torokhov29506412005-11-20 00:51:22 -0500282 newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 if (!newdev)
Dmitry Torokhov29506412005-11-20 00:51:22 -0500284 return -ENOMEM;
285
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500286 mutex_init(&newdev->mutex);
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500287 spin_lock_init(&newdev->requests_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 init_waitqueue_head(&newdev->requests_waitq);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500289 init_waitqueue_head(&newdev->waitq);
290 newdev->state = UIST_NEW_DEVICE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291
292 file->private_data = newdev;
Dmitry Torokhovdaf8a962010-02-04 00:30:39 -0800293 nonseekable_open(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
298static int uinput_validate_absbits(struct input_dev *dev)
299{
300 unsigned int cnt;
301 int retval = 0;
302
Daniel Mack81c2a3b2010-05-20 22:52:58 -0700303 for (cnt = 0; cnt < ABS_CNT; cnt++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 if (!test_bit(cnt, dev->absbit))
305 continue;
306
Daniel Mack987a6c02010-08-02 20:15:17 -0700307 if (input_abs_get_max(dev, cnt) <= input_abs_get_min(dev, cnt)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 printk(KERN_DEBUG
309 "%s: invalid abs[%02x] min:%d max:%d\n",
310 UINPUT_NAME, cnt,
Daniel Mack987a6c02010-08-02 20:15:17 -0700311 input_abs_get_min(dev, cnt),
312 input_abs_get_max(dev, cnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 retval = -EINVAL;
314 break;
315 }
316
Daniel Mack987a6c02010-08-02 20:15:17 -0700317 if (input_abs_get_flat(dev, cnt) >
318 input_abs_get_max(dev, cnt) - input_abs_get_min(dev, cnt)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 printk(KERN_DEBUG
Daniel Mack987a6c02010-08-02 20:15:17 -0700320 "%s: abs_flat #%02x out of range: %d "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 "(min:%d/max:%d)\n",
Daniel Mack987a6c02010-08-02 20:15:17 -0700322 UINPUT_NAME, cnt,
323 input_abs_get_flat(dev, cnt),
324 input_abs_get_min(dev, cnt),
325 input_abs_get_max(dev, cnt));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 retval = -EINVAL;
327 break;
328 }
329 }
330 return retval;
331}
332
Dmitry Torokhov29506412005-11-20 00:51:22 -0500333static int uinput_allocate_device(struct uinput_device *udev)
334{
335 udev->dev = input_allocate_device();
336 if (!udev->dev)
337 return -ENOMEM;
338
339 udev->dev->event = uinput_dev_event;
Dmitry Torokhov373f9712007-04-12 01:34:33 -0400340 input_set_drvdata(udev->dev, udev);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500341
342 return 0;
343}
344
345static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346{
347 struct uinput_user_dev *user_dev;
348 struct input_dev *dev;
Dmitry Torokhov5b6271b2005-06-30 00:50:38 -0500349 char *name;
Daniel Mack987a6c02010-08-02 20:15:17 -0700350 int i, size;
Dmitry Torokhov152c12f2005-06-30 00:47:50 -0500351 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352
Dmitry Torokhov29506412005-11-20 00:51:22 -0500353 if (count != sizeof(struct uinput_user_dev))
354 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Dmitry Torokhov29506412005-11-20 00:51:22 -0500356 if (!udev->dev) {
357 retval = uinput_allocate_device(udev);
358 if (retval)
359 return retval;
360 }
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 dev = udev->dev;
363
Dmitry Torokhov152c12f2005-06-30 00:47:50 -0500364 user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500365 if (!user_dev)
366 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
368 if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
369 retval = -EFAULT;
370 goto exit;
371 }
372
Anssi Hannulaff462552006-07-19 01:41:09 -0400373 udev->ff_effects_max = user_dev->ff_effects_max;
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500376 if (!size) {
377 retval = -EINVAL;
378 goto exit;
379 }
380
381 kfree(dev->name);
Dmitry Torokhov5b6271b2005-06-30 00:50:38 -0500382 dev->name = name = kmalloc(size, GFP_KERNEL);
383 if (!name) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 retval = -ENOMEM;
385 goto exit;
386 }
Dmitry Torokhov5b6271b2005-06-30 00:50:38 -0500387 strlcpy(name, user_dev->name, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 dev->id.bustype = user_dev->id.bustype;
390 dev->id.vendor = user_dev->id.vendor;
391 dev->id.product = user_dev->id.product;
392 dev->id.version = user_dev->id.version;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Daniel Mack987a6c02010-08-02 20:15:17 -0700394 for (i = 0; i < ABS_CNT; i++) {
395 input_abs_set_max(dev, i, user_dev->absmax[i]);
396 input_abs_set_min(dev, i, user_dev->absmin[i]);
397 input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
398 input_abs_set_flat(dev, i, user_dev->absflat[i]);
399 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401 /* check if absmin/absmax/absfuzz/absflat are filled as
402 * told in Documentation/input/input-programming.txt */
403 if (test_bit(EV_ABS, dev->evbit)) {
Dmitry Torokhov29506412005-11-20 00:51:22 -0500404 retval = uinput_validate_absbits(dev);
405 if (retval < 0)
406 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 }
408
Dmitry Torokhov29506412005-11-20 00:51:22 -0500409 udev->state = UIST_SETUP_COMPLETE;
410 retval = count;
411
412 exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 kfree(user_dev);
414 return retval;
415}
416
Dmitry Torokhov29506412005-11-20 00:51:22 -0500417static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
418{
419 struct input_event ev;
420
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400421 if (count < input_event_size())
Dmitry Torokhov29506412005-11-20 00:51:22 -0500422 return -EINVAL;
423
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400424 if (input_event_from_user(buffer, &ev))
Dmitry Torokhov29506412005-11-20 00:51:22 -0500425 return -EFAULT;
426
427 input_event(udev->dev, ev.type, ev.code, ev.value);
428
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400429 return input_event_size();
Dmitry Torokhov29506412005-11-20 00:51:22 -0500430}
431
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
433{
434 struct uinput_device *udev = file->private_data;
Dmitry Torokhov29506412005-11-20 00:51:22 -0500435 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500437 retval = mutex_lock_interruptible(&udev->mutex);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500438 if (retval)
439 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
Dmitry Torokhov29506412005-11-20 00:51:22 -0500441 retval = udev->state == UIST_CREATED ?
442 uinput_inject_event(udev, buffer, count) :
443 uinput_setup_device(udev, buffer, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500445 mutex_unlock(&udev->mutex);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500446
447 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448}
449
450static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
451{
452 struct uinput_device *udev = file->private_data;
453 int retval = 0;
454
Dmitry Torokhov29506412005-11-20 00:51:22 -0500455 if (udev->state != UIST_CREATED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 return -ENODEV;
457
Dmitry Torokhov152c12f2005-06-30 00:47:50 -0500458 if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 return -EAGAIN;
460
461 retval = wait_event_interruptible(udev->waitq,
Dmitry Torokhov29506412005-11-20 00:51:22 -0500462 udev->head != udev->tail || udev->state != UIST_CREATED);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 if (retval)
464 return retval;
465
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500466 retval = mutex_lock_interruptible(&udev->mutex);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500467 if (retval)
468 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469
Dmitry Torokhov29506412005-11-20 00:51:22 -0500470 if (udev->state != UIST_CREATED) {
471 retval = -ENODEV;
472 goto out;
473 }
474
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400475 while (udev->head != udev->tail && retval + input_event_size() <= count) {
476 if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) {
Dmitry Torokhov29506412005-11-20 00:51:22 -0500477 retval = -EFAULT;
478 goto out;
479 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400481 retval += input_event_size();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 }
483
Dmitry Torokhov29506412005-11-20 00:51:22 -0500484 out:
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500485 mutex_unlock(&udev->mutex);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500486
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 return retval;
488}
489
490static unsigned int uinput_poll(struct file *file, poll_table *wait)
491{
492 struct uinput_device *udev = file->private_data;
493
494 poll_wait(file, &udev->waitq, wait);
495
496 if (udev->head != udev->tail)
497 return POLLIN | POLLRDNORM;
498
499 return 0;
500}
501
Dmitry Torokhov29506412005-11-20 00:51:22 -0500502static int uinput_release(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503{
Dmitry Torokhov29506412005-11-20 00:51:22 -0500504 struct uinput_device *udev = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
Dmitry Torokhov29506412005-11-20 00:51:22 -0500506 uinput_destroy_device(udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 kfree(udev);
508
509 return 0;
510}
511
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400512#ifdef CONFIG_COMPAT
513struct uinput_ff_upload_compat {
514 int request_id;
515 int retval;
516 struct ff_effect_compat effect;
517 struct ff_effect_compat old;
518};
519
520static int uinput_ff_upload_to_user(char __user *buffer,
521 const struct uinput_ff_upload *ff_up)
522{
523 if (INPUT_COMPAT_TEST) {
524 struct uinput_ff_upload_compat ff_up_compat;
525
526 ff_up_compat.request_id = ff_up->request_id;
527 ff_up_compat.retval = ff_up->retval;
528 /*
529 * It so happens that the pointer that gives us the trouble
530 * is the last field in the structure. Since we don't support
531 * custom waveforms in uinput anyway we can just copy the whole
532 * thing (to the compat size) and ignore the pointer.
533 */
534 memcpy(&ff_up_compat.effect, &ff_up->effect,
535 sizeof(struct ff_effect_compat));
536 memcpy(&ff_up_compat.old, &ff_up->old,
537 sizeof(struct ff_effect_compat));
538
539 if (copy_to_user(buffer, &ff_up_compat,
540 sizeof(struct uinput_ff_upload_compat)))
541 return -EFAULT;
542 } else {
543 if (copy_to_user(buffer, ff_up,
544 sizeof(struct uinput_ff_upload)))
545 return -EFAULT;
546 }
547
548 return 0;
549}
550
551static int uinput_ff_upload_from_user(const char __user *buffer,
552 struct uinput_ff_upload *ff_up)
553{
554 if (INPUT_COMPAT_TEST) {
555 struct uinput_ff_upload_compat ff_up_compat;
556
557 if (copy_from_user(&ff_up_compat, buffer,
558 sizeof(struct uinput_ff_upload_compat)))
559 return -EFAULT;
560
561 ff_up->request_id = ff_up_compat.request_id;
562 ff_up->retval = ff_up_compat.retval;
563 memcpy(&ff_up->effect, &ff_up_compat.effect,
564 sizeof(struct ff_effect_compat));
565 memcpy(&ff_up->old, &ff_up_compat.old,
566 sizeof(struct ff_effect_compat));
567
568 } else {
569 if (copy_from_user(ff_up, buffer,
570 sizeof(struct uinput_ff_upload)))
571 return -EFAULT;
572 }
573
574 return 0;
575}
576
577#else
578
579static int uinput_ff_upload_to_user(char __user *buffer,
580 const struct uinput_ff_upload *ff_up)
581{
582 if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
583 return -EFAULT;
584
585 return 0;
586}
587
588static int uinput_ff_upload_from_user(const char __user *buffer,
589 struct uinput_ff_upload *ff_up)
590{
591 if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
592 return -EFAULT;
593
594 return 0;
595}
596
597#endif
598
Dmitry Torokhov29506412005-11-20 00:51:22 -0500599#define uinput_set_bit(_arg, _bit, _max) \
600({ \
601 int __ret = 0; \
602 if (udev->state == UIST_CREATED) \
603 __ret = -EINVAL; \
604 else if ((_arg) > (_max)) \
605 __ret = -EINVAL; \
606 else set_bit((_arg), udev->dev->_bit); \
607 __ret; \
608})
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400610static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
611 unsigned long arg, void __user *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612{
Dmitry Torokhov29506412005-11-20 00:51:22 -0500613 int retval;
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400614 struct uinput_device *udev = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 struct uinput_ff_upload ff_up;
616 struct uinput_ff_erase ff_erase;
617 struct uinput_request *req;
618 int length;
Dmitry Torokhov5b6271b2005-06-30 00:50:38 -0500619 char *phys;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500621 retval = mutex_lock_interruptible(&udev->mutex);
Dmitry Torokhov29506412005-11-20 00:51:22 -0500622 if (retval)
623 return retval;
624
625 if (!udev->dev) {
626 retval = uinput_allocate_device(udev);
627 if (retval)
628 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 }
630
631 switch (cmd) {
632 case UI_DEV_CREATE:
633 retval = uinput_create_device(udev);
634 break;
635
636 case UI_DEV_DESTROY:
Dmitry Torokhov29506412005-11-20 00:51:22 -0500637 uinput_destroy_device(udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 break;
639
640 case UI_SET_EVBIT:
Dmitry Torokhov29506412005-11-20 00:51:22 -0500641 retval = uinput_set_bit(arg, evbit, EV_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 break;
643
644 case UI_SET_KEYBIT:
Dmitry Torokhov29506412005-11-20 00:51:22 -0500645 retval = uinput_set_bit(arg, keybit, KEY_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 break;
647
648 case UI_SET_RELBIT:
Dmitry Torokhov29506412005-11-20 00:51:22 -0500649 retval = uinput_set_bit(arg, relbit, REL_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 break;
651
652 case UI_SET_ABSBIT:
Dmitry Torokhov29506412005-11-20 00:51:22 -0500653 retval = uinput_set_bit(arg, absbit, ABS_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 break;
655
656 case UI_SET_MSCBIT:
Dmitry Torokhov29506412005-11-20 00:51:22 -0500657 retval = uinput_set_bit(arg, mscbit, MSC_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 break;
659
660 case UI_SET_LEDBIT:
Dmitry Torokhov29506412005-11-20 00:51:22 -0500661 retval = uinput_set_bit(arg, ledbit, LED_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 break;
663
664 case UI_SET_SNDBIT:
Dmitry Torokhov29506412005-11-20 00:51:22 -0500665 retval = uinput_set_bit(arg, sndbit, SND_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 break;
667
668 case UI_SET_FFBIT:
Dmitry Torokhov29506412005-11-20 00:51:22 -0500669 retval = uinput_set_bit(arg, ffbit, FF_MAX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 break;
671
Dmitry Torokhov59c7c032005-11-20 00:51:33 -0500672 case UI_SET_SWBIT:
673 retval = uinput_set_bit(arg, swbit, SW_MAX);
674 break;
675
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 case UI_SET_PHYS:
Dmitry Torokhov29506412005-11-20 00:51:22 -0500677 if (udev->state == UIST_CREATED) {
678 retval = -EINVAL;
679 goto out;
680 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 length = strnlen_user(p, 1024);
682 if (length <= 0) {
683 retval = -EFAULT;
684 break;
685 }
Dmitry Torokhov5b6271b2005-06-30 00:50:38 -0500686 kfree(udev->dev->phys);
687 udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
688 if (!phys) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 retval = -ENOMEM;
690 break;
691 }
Dmitry Torokhov5b6271b2005-06-30 00:50:38 -0500692 if (copy_from_user(phys, p, length)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 udev->dev->phys = NULL;
Dmitry Torokhov5b6271b2005-06-30 00:50:38 -0500694 kfree(phys);
695 retval = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 break;
697 }
Dmitry Torokhov5b6271b2005-06-30 00:50:38 -0500698 phys[length - 1] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 break;
700
701 case UI_BEGIN_FF_UPLOAD:
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400702 retval = uinput_ff_upload_from_user(p, &ff_up);
703 if (retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 break;
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400705
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 req = uinput_request_find(udev, ff_up.request_id);
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400707 if (!req || req->code != UI_FF_UPLOAD || !req->u.upload.effect) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 retval = -EINVAL;
709 break;
710 }
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400711
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 ff_up.retval = 0;
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400713 ff_up.effect = *req->u.upload.effect;
Anssi Hannulaff462552006-07-19 01:41:09 -0400714 if (req->u.upload.old)
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400715 ff_up.old = *req->u.upload.old;
Anssi Hannulaff462552006-07-19 01:41:09 -0400716 else
717 memset(&ff_up.old, 0, sizeof(struct ff_effect));
718
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400719 retval = uinput_ff_upload_to_user(p, &ff_up);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 break;
721
722 case UI_BEGIN_FF_ERASE:
723 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
724 retval = -EFAULT;
725 break;
726 }
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 req = uinput_request_find(udev, ff_erase.request_id);
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400729 if (!req || req->code != UI_FF_ERASE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 retval = -EINVAL;
731 break;
732 }
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400733
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 ff_erase.retval = 0;
735 ff_erase.effect_id = req->u.effect_id;
736 if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
737 retval = -EFAULT;
738 break;
739 }
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 break;
742
743 case UI_END_FF_UPLOAD:
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400744 retval = uinput_ff_upload_from_user(p, &ff_up);
745 if (retval)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 break;
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 req = uinput_request_find(udev, ff_up.request_id);
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400749 if (!req || req->code != UI_FF_UPLOAD ||
750 !req->u.upload.effect) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 retval = -EINVAL;
752 break;
753 }
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400754
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 req->retval = ff_up.retval;
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500756 uinput_request_done(udev, req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 break;
758
759 case UI_END_FF_ERASE:
760 if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
761 retval = -EFAULT;
762 break;
763 }
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400764
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 req = uinput_request_find(udev, ff_erase.request_id);
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400766 if (!req || req->code != UI_FF_ERASE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 retval = -EINVAL;
768 break;
769 }
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400770
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 req->retval = ff_erase.retval;
Dmitry Torokhov0048e602005-06-30 00:48:14 -0500772 uinput_request_done(udev, req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 break;
774
775 default:
776 retval = -EINVAL;
777 }
Dmitry Torokhov29506412005-11-20 00:51:22 -0500778
779 out:
Dmitry Torokhov221979a2006-02-19 00:22:36 -0500780 mutex_unlock(&udev->mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 return retval;
782}
783
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400784static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
785{
786 return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
787}
788
789#ifdef CONFIG_COMPAT
790static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
791{
792 return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
793}
794#endif
795
Arjan van de Ven2b8693c2007-02-12 00:55:32 -0800796static const struct file_operations uinput_fops = {
Dmitry Torokhov29506412005-11-20 00:51:22 -0500797 .owner = THIS_MODULE,
798 .open = uinput_open,
799 .release = uinput_release,
800 .read = uinput_read,
801 .write = uinput_write,
802 .poll = uinput_poll,
803 .unlocked_ioctl = uinput_ioctl,
Philip Langdale2d56f3a2008-10-16 22:31:42 -0400804#ifdef CONFIG_COMPAT
805 .compat_ioctl = uinput_compat_ioctl,
806#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807};
808
809static struct miscdevice uinput_misc = {
Dmitry Torokhov29506412005-11-20 00:51:22 -0500810 .fops = &uinput_fops,
811 .minor = UINPUT_MINOR,
812 .name = UINPUT_NAME,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813};
Kay Sievers8905aaa2010-08-19 09:52:28 -0700814MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
815MODULE_ALIAS("devname:" UINPUT_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
817static int __init uinput_init(void)
818{
819 return misc_register(&uinput_misc);
820}
821
822static void __exit uinput_exit(void)
823{
824 misc_deregister(&uinput_misc);
825}
826
827MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
828MODULE_DESCRIPTION("User level driver support for input subsystem");
829MODULE_LICENSE("GPL");
Anssi Hannulaff462552006-07-19 01:41:09 -0400830MODULE_VERSION("0.3");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832module_init(uinput_init);
833module_exit(uinput_exit);
834