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path: root/drivers/input/evdev.c
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Diffstat (limited to 'drivers/input/evdev.c')
-rw-r--r--drivers/input/evdev.c716
1 files changed, 476 insertions, 240 deletions
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index f1c3d6cebd58..27026f7d3c03 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -30,6 +30,8 @@ struct evdev {
30 wait_queue_head_t wait; 30 wait_queue_head_t wait;
31 struct evdev_client *grab; 31 struct evdev_client *grab;
32 struct list_head client_list; 32 struct list_head client_list;
33 spinlock_t client_lock; /* protects client_list */
34 struct mutex mutex;
33 struct device dev; 35 struct device dev;
34}; 36};
35 37
@@ -37,39 +39,53 @@ struct evdev_client {
37 struct input_event buffer[EVDEV_BUFFER_SIZE]; 39 struct input_event buffer[EVDEV_BUFFER_SIZE];
38 int head; 40 int head;
39 int tail; 41 int tail;
42 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
40 struct fasync_struct *fasync; 43 struct fasync_struct *fasync;
41 struct evdev *evdev; 44 struct evdev *evdev;
42 struct list_head node; 45 struct list_head node;
43}; 46};
44 47
45static struct evdev *evdev_table[EVDEV_MINORS]; 48static struct evdev *evdev_table[EVDEV_MINORS];
49static DEFINE_MUTEX(evdev_table_mutex);
46 50
47static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value) 51static void evdev_pass_event(struct evdev_client *client,
52 struct input_event *event)
53{
54 /*
55 * Interrupts are disabled, just acquire the lock
56 */
57 spin_lock(&client->buffer_lock);
58 client->buffer[client->head++] = *event;
59 client->head &= EVDEV_BUFFER_SIZE - 1;
60 spin_unlock(&client->buffer_lock);
61
62 kill_fasync(&client->fasync, SIGIO, POLL_IN);
63}
64
65/*
66 * Pass incoming event to all connected clients. Note that we are
67 * caleld under a spinlock with interrupts off so we don't need
68 * to use rcu_read_lock() here. Writers will be using syncronize_sched()
69 * instead of synchrnoize_rcu().
70 */
71static void evdev_event(struct input_handle *handle,
72 unsigned int type, unsigned int code, int value)
48{ 73{
49 struct evdev *evdev = handle->private; 74 struct evdev *evdev = handle->private;
50 struct evdev_client *client; 75 struct evdev_client *client;
76 struct input_event event;
51 77
52 if (evdev->grab) { 78 do_gettimeofday(&event.time);
53 client = evdev->grab; 79 event.type = type;
54 80 event.code = code;
55 do_gettimeofday(&client->buffer[client->head].time); 81 event.value = value;
56 client->buffer[client->head].type = type;
57 client->buffer[client->head].code = code;
58 client->buffer[client->head].value = value;
59 client->head = (client->head + 1) & (EVDEV_BUFFER_SIZE - 1);
60
61 kill_fasync(&client->fasync, SIGIO, POLL_IN);
62 } else
63 list_for_each_entry(client, &evdev->client_list, node) {
64
65 do_gettimeofday(&client->buffer[client->head].time);
66 client->buffer[client->head].type = type;
67 client->buffer[client->head].code = code;
68 client->buffer[client->head].value = value;
69 client->head = (client->head + 1) & (EVDEV_BUFFER_SIZE - 1);
70 82
71 kill_fasync(&client->fasync, SIGIO, POLL_IN); 83 client = rcu_dereference(evdev->grab);
72 } 84 if (client)
85 evdev_pass_event(client, &event);
86 else
87 list_for_each_entry_rcu(client, &evdev->client_list, node)
88 evdev_pass_event(client, &event);
73 89
74 wake_up_interruptible(&evdev->wait); 90 wake_up_interruptible(&evdev->wait);
75} 91}
@@ -88,38 +104,145 @@ static int evdev_flush(struct file *file, fl_owner_t id)
88{ 104{
89 struct evdev_client *client = file->private_data; 105 struct evdev_client *client = file->private_data;
90 struct evdev *evdev = client->evdev; 106 struct evdev *evdev = client->evdev;
107 int retval;
108
109 retval = mutex_lock_interruptible(&evdev->mutex);
110 if (retval)
111 return retval;
91 112
92 if (!evdev->exist) 113 if (!evdev->exist)
93 return -ENODEV; 114 retval = -ENODEV;
115 else
116 retval = input_flush_device(&evdev->handle, file);
94 117
95 return input_flush_device(&evdev->handle, file); 118 mutex_unlock(&evdev->mutex);
119 return retval;
96} 120}
97 121
98static void evdev_free(struct device *dev) 122static void evdev_free(struct device *dev)
99{ 123{
100 struct evdev *evdev = container_of(dev, struct evdev, dev); 124 struct evdev *evdev = container_of(dev, struct evdev, dev);
101 125
102 evdev_table[evdev->minor] = NULL;
103 kfree(evdev); 126 kfree(evdev);
104} 127}
105 128
129/*
130 * Grabs an event device (along with underlying input device).
131 * This function is called with evdev->mutex taken.
132 */
133static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
134{
135 int error;
136
137 if (evdev->grab)
138 return -EBUSY;
139
140 error = input_grab_device(&evdev->handle);
141 if (error)
142 return error;
143
144 rcu_assign_pointer(evdev->grab, client);
145 /*
146 * We don't use synchronize_rcu() here because read-side
147 * critical section is protected by a spinlock instead
148 * of rcu_read_lock().
149 */
150 synchronize_sched();
151
152 return 0;
153}
154
155static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
156{
157 if (evdev->grab != client)
158 return -EINVAL;
159
160 rcu_assign_pointer(evdev->grab, NULL);
161 synchronize_sched();
162 input_release_device(&evdev->handle);
163
164 return 0;
165}
166
167static void evdev_attach_client(struct evdev *evdev,
168 struct evdev_client *client)
169{
170 spin_lock(&evdev->client_lock);
171 list_add_tail_rcu(&client->node, &evdev->client_list);
172 spin_unlock(&evdev->client_lock);
173 synchronize_sched();
174}
175
176static void evdev_detach_client(struct evdev *evdev,
177 struct evdev_client *client)
178{
179 spin_lock(&evdev->client_lock);
180 list_del_rcu(&client->node);
181 spin_unlock(&evdev->client_lock);
182 synchronize_sched();
183}
184
185static int evdev_open_device(struct evdev *evdev)
186{
187 int retval;
188
189 retval = mutex_lock_interruptible(&evdev->mutex);
190 if (retval)
191 return retval;
192
193 if (!evdev->exist)
194 retval = -ENODEV;
195 else if (!evdev->open++) {
196 retval = input_open_device(&evdev->handle);
197 if (retval)
198 evdev->open--;
199 }
200
201 mutex_unlock(&evdev->mutex);
202 return retval;
203}
204
205static void evdev_close_device(struct evdev *evdev)
206{
207 mutex_lock(&evdev->mutex);
208
209 if (evdev->exist && !--evdev->open)
210 input_close_device(&evdev->handle);
211
212 mutex_unlock(&evdev->mutex);
213}
214
215/*
216 * Wake up users waiting for IO so they can disconnect from
217 * dead device.
218 */
219static void evdev_hangup(struct evdev *evdev)
220{
221 struct evdev_client *client;
222
223 spin_lock(&evdev->client_lock);
224 list_for_each_entry(client, &evdev->client_list, node)
225 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
226 spin_unlock(&evdev->client_lock);
227
228 wake_up_interruptible(&evdev->wait);
229}
230
106static int evdev_release(struct inode *inode, struct file *file) 231static int evdev_release(struct inode *inode, struct file *file)
107{ 232{
108 struct evdev_client *client = file->private_data; 233 struct evdev_client *client = file->private_data;
109 struct evdev *evdev = client->evdev; 234 struct evdev *evdev = client->evdev;
110 235
111 if (evdev->grab == client) { 236 mutex_lock(&evdev->mutex);
112 input_release_device(&evdev->handle); 237 if (evdev->grab == client)
113 evdev->grab = NULL; 238 evdev_ungrab(evdev, client);
114 } 239 mutex_unlock(&evdev->mutex);
115 240
116 evdev_fasync(-1, file, 0); 241 evdev_fasync(-1, file, 0);
117 list_del(&client->node); 242 evdev_detach_client(evdev, client);
118 kfree(client); 243 kfree(client);
119 244
120 if (!--evdev->open && evdev->exist) 245 evdev_close_device(evdev);
121 input_close_device(&evdev->handle);
122
123 put_device(&evdev->dev); 246 put_device(&evdev->dev);
124 247
125 return 0; 248 return 0;
@@ -127,41 +250,44 @@ static int evdev_release(struct inode *inode, struct file *file)
127 250
128static int evdev_open(struct inode *inode, struct file *file) 251static int evdev_open(struct inode *inode, struct file *file)
129{ 252{
130 struct evdev_client *client;
131 struct evdev *evdev; 253 struct evdev *evdev;
254 struct evdev_client *client;
132 int i = iminor(inode) - EVDEV_MINOR_BASE; 255 int i = iminor(inode) - EVDEV_MINOR_BASE;
133 int error; 256 int error;
134 257
135 if (i >= EVDEV_MINORS) 258 if (i >= EVDEV_MINORS)
136 return -ENODEV; 259 return -ENODEV;
137 260
261 error = mutex_lock_interruptible(&evdev_table_mutex);
262 if (error)
263 return error;
138 evdev = evdev_table[i]; 264 evdev = evdev_table[i];
265 if (evdev)
266 get_device(&evdev->dev);
267 mutex_unlock(&evdev_table_mutex);
139 268
140 if (!evdev || !evdev->exist) 269 if (!evdev)
141 return -ENODEV; 270 return -ENODEV;
142 271
143 get_device(&evdev->dev);
144
145 client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL); 272 client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
146 if (!client) { 273 if (!client) {
147 error = -ENOMEM; 274 error = -ENOMEM;
148 goto err_put_evdev; 275 goto err_put_evdev;
149 } 276 }
150 277
278 spin_lock_init(&client->buffer_lock);
151 client->evdev = evdev; 279 client->evdev = evdev;
152 list_add_tail(&client->node, &evdev->client_list); 280 evdev_attach_client(evdev, client);
153 281
154 if (!evdev->open++ && evdev->exist) { 282 error = evdev_open_device(evdev);
155 error = input_open_device(&evdev->handle); 283 if (error)
156 if (error) 284 goto err_free_client;
157 goto err_free_client;
158 }
159 285
160 file->private_data = client; 286 file->private_data = client;
161 return 0; 287 return 0;
162 288
163 err_free_client: 289 err_free_client:
164 list_del(&client->node); 290 evdev_detach_client(evdev, client);
165 kfree(client); 291 kfree(client);
166 err_put_evdev: 292 err_put_evdev:
167 put_device(&evdev->dev); 293 put_device(&evdev->dev);
@@ -197,12 +323,14 @@ static inline size_t evdev_event_size(void)
197 sizeof(struct input_event_compat) : sizeof(struct input_event); 323 sizeof(struct input_event_compat) : sizeof(struct input_event);
198} 324}
199 325
200static int evdev_event_from_user(const char __user *buffer, struct input_event *event) 326static int evdev_event_from_user(const char __user *buffer,
327 struct input_event *event)
201{ 328{
202 if (COMPAT_TEST) { 329 if (COMPAT_TEST) {
203 struct input_event_compat compat_event; 330 struct input_event_compat compat_event;
204 331
205 if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat))) 332 if (copy_from_user(&compat_event, buffer,
333 sizeof(struct input_event_compat)))
206 return -EFAULT; 334 return -EFAULT;
207 335
208 event->time.tv_sec = compat_event.time.tv_sec; 336 event->time.tv_sec = compat_event.time.tv_sec;
@@ -219,7 +347,8 @@ static int evdev_event_from_user(const char __user *buffer, struct input_event *
219 return 0; 347 return 0;
220} 348}
221 349
222static int evdev_event_to_user(char __user *buffer, const struct input_event *event) 350static int evdev_event_to_user(char __user *buffer,
351 const struct input_event *event)
223{ 352{
224 if (COMPAT_TEST) { 353 if (COMPAT_TEST) {
225 struct input_event_compat compat_event; 354 struct input_event_compat compat_event;
@@ -230,7 +359,8 @@ static int evdev_event_to_user(char __user *buffer, const struct input_event *ev
230 compat_event.code = event->code; 359 compat_event.code = event->code;
231 compat_event.value = event->value; 360 compat_event.value = event->value;
232 361
233 if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat))) 362 if (copy_to_user(buffer, &compat_event,
363 sizeof(struct input_event_compat)))
234 return -EFAULT; 364 return -EFAULT;
235 365
236 } else { 366 } else {
@@ -248,7 +378,8 @@ static inline size_t evdev_event_size(void)
248 return sizeof(struct input_event); 378 return sizeof(struct input_event);
249} 379}
250 380
251static int evdev_event_from_user(const char __user *buffer, struct input_event *event) 381static int evdev_event_from_user(const char __user *buffer,
382 struct input_event *event)
252{ 383{
253 if (copy_from_user(event, buffer, sizeof(struct input_event))) 384 if (copy_from_user(event, buffer, sizeof(struct input_event)))
254 return -EFAULT; 385 return -EFAULT;
@@ -256,7 +387,8 @@ static int evdev_event_from_user(const char __user *buffer, struct input_event *
256 return 0; 387 return 0;
257} 388}
258 389
259static int evdev_event_to_user(char __user *buffer, const struct input_event *event) 390static int evdev_event_to_user(char __user *buffer,
391 const struct input_event *event)
260{ 392{
261 if (copy_to_user(buffer, event, sizeof(struct input_event))) 393 if (copy_to_user(buffer, event, sizeof(struct input_event)))
262 return -EFAULT; 394 return -EFAULT;
@@ -266,37 +398,71 @@ static int evdev_event_to_user(char __user *buffer, const struct input_event *ev
266 398
267#endif /* CONFIG_COMPAT */ 399#endif /* CONFIG_COMPAT */
268 400
269static ssize_t evdev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) 401static ssize_t evdev_write(struct file *file, const char __user *buffer,
402 size_t count, loff_t *ppos)
270{ 403{
271 struct evdev_client *client = file->private_data; 404 struct evdev_client *client = file->private_data;
272 struct evdev *evdev = client->evdev; 405 struct evdev *evdev = client->evdev;
273 struct input_event event; 406 struct input_event event;
274 int retval = 0; 407 int retval;
275 408
276 if (!evdev->exist) 409 retval = mutex_lock_interruptible(&evdev->mutex);
277 return -ENODEV; 410 if (retval)
411 return retval;
412
413 if (!evdev->exist) {
414 retval = -ENODEV;
415 goto out;
416 }
278 417
279 while (retval < count) { 418 while (retval < count) {
280 419
281 if (evdev_event_from_user(buffer + retval, &event)) 420 if (evdev_event_from_user(buffer + retval, &event)) {
282 return -EFAULT; 421 retval = -EFAULT;
283 input_inject_event(&evdev->handle, event.type, event.code, event.value); 422 goto out;
423 }
424
425 input_inject_event(&evdev->handle,
426 event.type, event.code, event.value);
284 retval += evdev_event_size(); 427 retval += evdev_event_size();
285 } 428 }
286 429
430 out:
431 mutex_unlock(&evdev->mutex);
287 return retval; 432 return retval;
288} 433}
289 434
290static ssize_t evdev_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) 435static int evdev_fetch_next_event(struct evdev_client *client,
436 struct input_event *event)
437{
438 int have_event;
439
440 spin_lock_irq(&client->buffer_lock);
441
442 have_event = client->head != client->tail;
443 if (have_event) {
444 *event = client->buffer[client->tail++];
445 client->tail &= EVDEV_BUFFER_SIZE - 1;
446 }
447
448 spin_unlock_irq(&client->buffer_lock);
449
450 return have_event;
451}
452
453static ssize_t evdev_read(struct file *file, char __user *buffer,
454 size_t count, loff_t *ppos)
291{ 455{
292 struct evdev_client *client = file->private_data; 456 struct evdev_client *client = file->private_data;
293 struct evdev *evdev = client->evdev; 457 struct evdev *evdev = client->evdev;
458 struct input_event event;
294 int retval; 459 int retval;
295 460
296 if (count < evdev_event_size()) 461 if (count < evdev_event_size())
297 return -EINVAL; 462 return -EINVAL;
298 463
299 if (client->head == client->tail && evdev->exist && (file->f_flags & O_NONBLOCK)) 464 if (client->head == client->tail && evdev->exist &&
465 (file->f_flags & O_NONBLOCK))
300 return -EAGAIN; 466 return -EAGAIN;
301 467
302 retval = wait_event_interruptible(evdev->wait, 468 retval = wait_event_interruptible(evdev->wait,
@@ -307,14 +473,12 @@ static ssize_t evdev_read(struct file *file, char __user *buffer, size_t count,
307 if (!evdev->exist) 473 if (!evdev->exist)
308 return -ENODEV; 474 return -ENODEV;
309 475
310 while (client->head != client->tail && retval + evdev_event_size() <= count) { 476 while (retval + evdev_event_size() <= count &&
477 evdev_fetch_next_event(client, &event)) {
311 478
312 struct input_event *event = (struct input_event *) client->buffer + client->tail; 479 if (evdev_event_to_user(buffer + retval, &event))
313
314 if (evdev_event_to_user(buffer + retval, event))
315 return -EFAULT; 480 return -EFAULT;
316 481
317 client->tail = (client->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
318 retval += evdev_event_size(); 482 retval += evdev_event_size();
319 } 483 }
320 484
@@ -409,8 +573,8 @@ static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
409 return copy_to_user(p, str, len) ? -EFAULT : len; 573 return copy_to_user(p, str, len) ? -EFAULT : len;
410} 574}
411 575
412static long evdev_ioctl_handler(struct file *file, unsigned int cmd, 576static long evdev_do_ioctl(struct file *file, unsigned int cmd,
413 void __user *p, int compat_mode) 577 void __user *p, int compat_mode)
414{ 578{
415 struct evdev_client *client = file->private_data; 579 struct evdev_client *client = file->private_data;
416 struct evdev *evdev = client->evdev; 580 struct evdev *evdev = client->evdev;
@@ -421,215 +585,289 @@ static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
421 int i, t, u, v; 585 int i, t, u, v;
422 int error; 586 int error;
423 587
424 if (!evdev->exist)
425 return -ENODEV;
426
427 switch (cmd) { 588 switch (cmd) {
428 589
429 case EVIOCGVERSION: 590 case EVIOCGVERSION:
430 return put_user(EV_VERSION, ip); 591 return put_user(EV_VERSION, ip);
431 592
432 case EVIOCGID: 593 case EVIOCGID:
433 if (copy_to_user(p, &dev->id, sizeof(struct input_id))) 594 if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
434 return -EFAULT; 595 return -EFAULT;
435 return 0; 596 return 0;
436 597
437 case EVIOCGREP: 598 case EVIOCGREP:
438 if (!test_bit(EV_REP, dev->evbit)) 599 if (!test_bit(EV_REP, dev->evbit))
439 return -ENOSYS; 600 return -ENOSYS;
440 if (put_user(dev->rep[REP_DELAY], ip)) 601 if (put_user(dev->rep[REP_DELAY], ip))
441 return -EFAULT; 602 return -EFAULT;
442 if (put_user(dev->rep[REP_PERIOD], ip + 1)) 603 if (put_user(dev->rep[REP_PERIOD], ip + 1))
443 return -EFAULT; 604 return -EFAULT;
444 return 0; 605 return 0;
445 606
446 case EVIOCSREP: 607 case EVIOCSREP:
447 if (!test_bit(EV_REP, dev->evbit)) 608 if (!test_bit(EV_REP, dev->evbit))
448 return -ENOSYS; 609 return -ENOSYS;
449 if (get_user(u, ip)) 610 if (get_user(u, ip))
450 return -EFAULT; 611 return -EFAULT;
451 if (get_user(v, ip + 1)) 612 if (get_user(v, ip + 1))
452 return -EFAULT; 613 return -EFAULT;
453 614
454 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); 615 input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
455 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); 616 input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
456 617
457 return 0; 618 return 0;
458 619
459 case EVIOCGKEYCODE: 620 case EVIOCGKEYCODE:
460 if (get_user(t, ip)) 621 if (get_user(t, ip))
461 return -EFAULT; 622 return -EFAULT;
462 623
463 error = dev->getkeycode(dev, t, &v); 624 error = dev->getkeycode(dev, t, &v);
464 if (error) 625 if (error)
465 return error; 626 return error;
466 627
467 if (put_user(v, ip + 1)) 628 if (put_user(v, ip + 1))
468 return -EFAULT; 629 return -EFAULT;
469 630
470 return 0; 631 return 0;
471 632
472 case EVIOCSKEYCODE: 633 case EVIOCSKEYCODE:
473 if (get_user(t, ip) || get_user(v, ip + 1)) 634 if (get_user(t, ip) || get_user(v, ip + 1))
474 return -EFAULT; 635 return -EFAULT;
475 636
476 return dev->setkeycode(dev, t, v); 637 return dev->setkeycode(dev, t, v);
477 638
478 case EVIOCSFF: 639 case EVIOCSFF:
479 if (copy_from_user(&effect, p, sizeof(effect))) 640 if (copy_from_user(&effect, p, sizeof(effect)))
480 return -EFAULT; 641 return -EFAULT;
481 642
482 error = input_ff_upload(dev, &effect, file); 643 error = input_ff_upload(dev, &effect, file);
483 644
484 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) 645 if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
485 return -EFAULT; 646 return -EFAULT;
486 647
487 return error; 648 return error;
488 649
489 case EVIOCRMFF: 650 case EVIOCRMFF:
490 return input_ff_erase(dev, (int)(unsigned long) p, file); 651 return input_ff_erase(dev, (int)(unsigned long) p, file);
491 652
492 case EVIOCGEFFECTS: 653 case EVIOCGEFFECTS:
493 i = test_bit(EV_FF, dev->evbit) ? dev->ff->max_effects : 0; 654 i = test_bit(EV_FF, dev->evbit) ?
494 if (put_user(i, ip)) 655 dev->ff->max_effects : 0;
495 return -EFAULT; 656 if (put_user(i, ip))
496 return 0; 657 return -EFAULT;
497 658 return 0;
498 case EVIOCGRAB:
499 if (p) {
500 if (evdev->grab)
501 return -EBUSY;
502 if (input_grab_device(&evdev->handle))
503 return -EBUSY;
504 evdev->grab = client;
505 return 0;
506 } else {
507 if (evdev->grab != client)
508 return -EINVAL;
509 input_release_device(&evdev->handle);
510 evdev->grab = NULL;
511 return 0;
512 }
513 659
514 default: 660 case EVIOCGRAB:
661 if (p)
662 return evdev_grab(evdev, client);
663 else
664 return evdev_ungrab(evdev, client);
515 665
516 if (_IOC_TYPE(cmd) != 'E') 666 default:
517 return -EINVAL;
518 667
519 if (_IOC_DIR(cmd) == _IOC_READ) { 668 if (_IOC_TYPE(cmd) != 'E')
669 return -EINVAL;
520 670
521 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { 671 if (_IOC_DIR(cmd) == _IOC_READ) {
522 672
523 unsigned long *bits; 673 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0))) {
524 int len;
525 674
526 switch (_IOC_NR(cmd) & EV_MAX) { 675 unsigned long *bits;
527 case 0: bits = dev->evbit; len = EV_MAX; break; 676 int len;
528 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
529 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
530 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
531 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
532 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
533 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
534 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
535 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
536 default: return -EINVAL;
537 }
538 return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
539 }
540 677
541 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) 678 switch (_IOC_NR(cmd) & EV_MAX) {
542 return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
543 p, compat_mode);
544 679
545 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) 680 case 0: bits = dev->evbit; len = EV_MAX; break;
546 return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), 681 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
547 p, compat_mode); 682 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
683 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
684 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
685 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
686 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
687 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
688 case EV_SW: bits = dev->swbit; len = SW_MAX; break;
689 default: return -EINVAL;
690 }
691 return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode);
692 }
548 693
549 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) 694 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
550 return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), 695 return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
551 p, compat_mode); 696 p, compat_mode);
552 697
553 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) 698 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
554 return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), 699 return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
555 p, compat_mode); 700 p, compat_mode);
556 701
557 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) 702 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
558 return str_to_user(dev->name, _IOC_SIZE(cmd), p); 703 return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
704 p, compat_mode);
559 705
560 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) 706 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
561 return str_to_user(dev->phys, _IOC_SIZE(cmd), p); 707 return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
708 p, compat_mode);
562 709
563 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) 710 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
564 return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); 711 return str_to_user(dev->name, _IOC_SIZE(cmd), p);
565 712
566 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { 713 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
714 return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
567 715
568 t = _IOC_NR(cmd) & ABS_MAX; 716 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
717 return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
569 718
570 abs.value = dev->abs[t]; 719 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
571 abs.minimum = dev->absmin[t];
572 abs.maximum = dev->absmax[t];
573 abs.fuzz = dev->absfuzz[t];
574 abs.flat = dev->absflat[t];
575 720
576 if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) 721 t = _IOC_NR(cmd) & ABS_MAX;
577 return -EFAULT;
578 722
579 return 0; 723 abs.value = dev->abs[t];
580 } 724 abs.minimum = dev->absmin[t];
725 abs.maximum = dev->absmax[t];
726 abs.fuzz = dev->absfuzz[t];
727 abs.flat = dev->absflat[t];
581 728
729 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
730 return -EFAULT;
731
732 return 0;
582 } 733 }
583 734
584 if (_IOC_DIR(cmd) == _IOC_WRITE) { 735 }
585 736
586 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { 737 if (_IOC_DIR(cmd) == _IOC_WRITE) {
587 738
588 t = _IOC_NR(cmd) & ABS_MAX; 739 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
589 740
590 if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) 741 t = _IOC_NR(cmd) & ABS_MAX;
591 return -EFAULT;
592 742
593 dev->abs[t] = abs.value; 743 if (copy_from_user(&abs, p,
594 dev->absmin[t] = abs.minimum; 744 sizeof(struct input_absinfo)))
595 dev->absmax[t] = abs.maximum; 745 return -EFAULT;
596 dev->absfuzz[t] = abs.fuzz;
597 dev->absflat[t] = abs.flat;
598 746
599 return 0; 747 /*
600 } 748 * Take event lock to ensure that we are not
749 * changing device parameters in the middle
750 * of event.
751 */
752 spin_lock_irq(&dev->event_lock);
753
754 dev->abs[t] = abs.value;
755 dev->absmin[t] = abs.minimum;
756 dev->absmax[t] = abs.maximum;
757 dev->absfuzz[t] = abs.fuzz;
758 dev->absflat[t] = abs.flat;
759
760 spin_unlock_irq(&dev->event_lock);
761
762 return 0;
601 } 763 }
764 }
602 } 765 }
603 return -EINVAL; 766 return -EINVAL;
604} 767}
605 768
769static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
770 void __user *p, int compat_mode)
771{
772 struct evdev_client *client = file->private_data;
773 struct evdev *evdev = client->evdev;
774 int retval;
775
776 retval = mutex_lock_interruptible(&evdev->mutex);
777 if (retval)
778 return retval;
779
780 if (!evdev->exist) {
781 retval = -ENODEV;
782 goto out;
783 }
784
785 retval = evdev_do_ioctl(file, cmd, p, compat_mode);
786
787 out:
788 mutex_unlock(&evdev->mutex);
789 return retval;
790}
791
606static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 792static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
607{ 793{
608 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); 794 return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
609} 795}
610 796
611#ifdef CONFIG_COMPAT 797#ifdef CONFIG_COMPAT
612static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) 798static long evdev_ioctl_compat(struct file *file,
799 unsigned int cmd, unsigned long arg)
613{ 800{
614 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); 801 return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
615} 802}
616#endif 803#endif
617 804
618static const struct file_operations evdev_fops = { 805static const struct file_operations evdev_fops = {
619 .owner = THIS_MODULE, 806 .owner = THIS_MODULE,
620 .read = evdev_read, 807 .read = evdev_read,
621 .write = evdev_write, 808 .write = evdev_write,
622 .poll = evdev_poll, 809 .poll = evdev_poll,
623 .open = evdev_open, 810 .open = evdev_open,
624 .release = evdev_release, 811 .release = evdev_release,
625 .unlocked_ioctl = evdev_ioctl, 812 .unlocked_ioctl = evdev_ioctl,
626#ifdef CONFIG_COMPAT 813#ifdef CONFIG_COMPAT
627 .compat_ioctl = evdev_ioctl_compat, 814 .compat_ioctl = evdev_ioctl_compat,
628#endif 815#endif
629 .fasync = evdev_fasync, 816 .fasync = evdev_fasync,
630 .flush = evdev_flush 817 .flush = evdev_flush
631}; 818};
632 819
820static int evdev_install_chrdev(struct evdev *evdev)
821{
822 /*
823 * No need to do any locking here as calls to connect and
824 * disconnect are serialized by the input core
825 */
826 evdev_table[evdev->minor] = evdev;
827 return 0;
828}
829
830static void evdev_remove_chrdev(struct evdev *evdev)
831{
832 /*
833 * Lock evdev table to prevent race with evdev_open()
834 */
835 mutex_lock(&evdev_table_mutex);
836 evdev_table[evdev->minor] = NULL;
837 mutex_unlock(&evdev_table_mutex);
838}
839
840/*
841 * Mark device non-existent. This disables writes, ioctls and
842 * prevents new users from opening the device. Already posted
843 * blocking reads will stay, however new ones will fail.
844 */
845static void evdev_mark_dead(struct evdev *evdev)
846{
847 mutex_lock(&evdev->mutex);
848 evdev->exist = 0;
849 mutex_unlock(&evdev->mutex);
850}
851
852static void evdev_cleanup(struct evdev *evdev)
853{
854 struct input_handle *handle = &evdev->handle;
855
856 evdev_mark_dead(evdev);
857 evdev_hangup(evdev);
858 evdev_remove_chrdev(evdev);
859
860 /* evdev is marked dead so no one else accesses evdev->open */
861 if (evdev->open) {
862 input_flush_device(handle, NULL);
863 input_close_device(handle);
864 }
865}
866
867/*
868 * Create new evdev device. Note that input core serializes calls
869 * to connect and disconnect so we don't need to lock evdev_table here.
870 */
633static int evdev_connect(struct input_handler *handler, struct input_dev *dev, 871static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
634 const struct input_device_id *id) 872 const struct input_device_id *id)
635{ 873{
@@ -637,7 +875,10 @@ static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
637 int minor; 875 int minor;
638 int error; 876 int error;
639 877
640 for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++); 878 for (minor = 0; minor < EVDEV_MINORS; minor++)
879 if (!evdev_table[minor])
880 break;
881
641 if (minor == EVDEV_MINORS) { 882 if (minor == EVDEV_MINORS) {
642 printk(KERN_ERR "evdev: no more free evdev devices\n"); 883 printk(KERN_ERR "evdev: no more free evdev devices\n");
643 return -ENFILE; 884 return -ENFILE;
@@ -648,38 +889,44 @@ static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
648 return -ENOMEM; 889 return -ENOMEM;
649 890
650 INIT_LIST_HEAD(&evdev->client_list); 891 INIT_LIST_HEAD(&evdev->client_list);
892 spin_lock_init(&evdev->client_lock);
893 mutex_init(&evdev->mutex);
651 init_waitqueue_head(&evdev->wait); 894 init_waitqueue_head(&evdev->wait);
652 895
896 snprintf(evdev->name, sizeof(evdev->name), "event%d", minor);
653 evdev->exist = 1; 897 evdev->exist = 1;
654 evdev->minor = minor; 898 evdev->minor = minor;
899
655 evdev->handle.dev = dev; 900 evdev->handle.dev = dev;
656 evdev->handle.name = evdev->name; 901 evdev->handle.name = evdev->name;
657 evdev->handle.handler = handler; 902 evdev->handle.handler = handler;
658 evdev->handle.private = evdev; 903 evdev->handle.private = evdev;
659 snprintf(evdev->name, sizeof(evdev->name), "event%d", minor);
660 904
661 snprintf(evdev->dev.bus_id, sizeof(evdev->dev.bus_id), 905 strlcpy(evdev->dev.bus_id, evdev->name, sizeof(evdev->dev.bus_id));
662 "event%d", minor); 906 evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
663 evdev->dev.class = &input_class; 907 evdev->dev.class = &input_class;
664 evdev->dev.parent = &dev->dev; 908 evdev->dev.parent = &dev->dev;
665 evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
666 evdev->dev.release = evdev_free; 909 evdev->dev.release = evdev_free;
667 device_initialize(&evdev->dev); 910 device_initialize(&evdev->dev);
668 911
669 evdev_table[minor] = evdev; 912 error = input_register_handle(&evdev->handle);
670
671 error = device_add(&evdev->dev);
672 if (error) 913 if (error)
673 goto err_free_evdev; 914 goto err_free_evdev;
674 915
675 error = input_register_handle(&evdev->handle); 916 error = evdev_install_chrdev(evdev);
917 if (error)
918 goto err_unregister_handle;
919
920 error = device_add(&evdev->dev);
676 if (error) 921 if (error)
677 goto err_delete_evdev; 922 goto err_cleanup_evdev;
678 923
679 return 0; 924 return 0;
680 925
681 err_delete_evdev: 926 err_cleanup_evdev:
682 device_del(&evdev->dev); 927 evdev_cleanup(evdev);
928 err_unregister_handle:
929 input_unregister_handle(&evdev->handle);
683 err_free_evdev: 930 err_free_evdev:
684 put_device(&evdev->dev); 931 put_device(&evdev->dev);
685 return error; 932 return error;
@@ -688,21 +935,10 @@ static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
688static void evdev_disconnect(struct input_handle *handle) 935static void evdev_disconnect(struct input_handle *handle)
689{ 936{
690 struct evdev *evdev = handle->private; 937 struct evdev *evdev = handle->private;
691 struct evdev_client *client;
692 938
693 input_unregister_handle(handle);
694 device_del(&evdev->dev); 939 device_del(&evdev->dev);
695 940 evdev_cleanup(evdev);
696 evdev->exist = 0; 941 input_unregister_handle(handle);
697
698 if (evdev->open) {
699 input_flush_device(handle, NULL);
700 input_close_device(handle);
701 list_for_each_entry(client, &evdev->client_list, node)
702 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
703 wake_up_interruptible(&evdev->wait);
704 }
705
706 put_device(&evdev->dev); 942 put_device(&evdev->dev);
707} 943}
708 944
@@ -714,13 +950,13 @@ static const struct input_device_id evdev_ids[] = {
714MODULE_DEVICE_TABLE(input, evdev_ids); 950MODULE_DEVICE_TABLE(input, evdev_ids);
715 951
716static struct input_handler evdev_handler = { 952static struct input_handler evdev_handler = {
717 .event = evdev_event, 953 .event = evdev_event,
718 .connect = evdev_connect, 954 .connect = evdev_connect,
719 .disconnect = evdev_disconnect, 955 .disconnect = evdev_disconnect,
720 .fops = &evdev_fops, 956 .fops = &evdev_fops,
721 .minor = EVDEV_MINOR_BASE, 957 .minor = EVDEV_MINOR_BASE,
722 .name = "evdev", 958 .name = "evdev",
723 .id_table = evdev_ids, 959 .id_table = evdev_ids,
724}; 960};
725 961
726static int __init evdev_init(void) 962static int __init evdev_init(void)
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-21 12:23:08 -0500