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path: root/drivers/input/evdev.c
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-rw-r--r--drivers/input/evdev.c407
1 files changed, 327 insertions, 80 deletions
diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 556264b43425..374f404e81da 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -21,6 +21,7 @@
21#include <linux/smp_lock.h> 21#include <linux/smp_lock.h>
22#include <linux/device.h> 22#include <linux/device.h>
23#include <linux/devfs_fs_kernel.h> 23#include <linux/devfs_fs_kernel.h>
24#include <linux/compat.h>
24 25
25struct evdev { 26struct evdev {
26 int exist; 27 int exist;
@@ -145,6 +146,41 @@ static int evdev_open(struct inode * inode, struct file * file)
145 return 0; 146 return 0;
146} 147}
147 148
149#ifdef CONFIG_COMPAT
150struct input_event_compat {
151 struct compat_timeval time;
152 __u16 type;
153 __u16 code;
154 __s32 value;
155};
156
157#ifdef CONFIG_X86_64
158# define COMPAT_TEST test_thread_flag(TIF_IA32)
159#elif defined(CONFIG_IA64)
160# define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current))
161#elif defined(CONFIG_ARCH_S390)
162# define COMPAT_TEST test_thread_flag(TIF_31BIT)
163#else
164# define COMPAT_TEST test_thread_flag(TIF_32BIT)
165#endif
166
167static ssize_t evdev_write_compat(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
168{
169 struct evdev_list *list = file->private_data;
170 struct input_event_compat event;
171 int retval = 0;
172
173 while (retval < count) {
174 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event_compat)))
175 return -EFAULT;
176 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
177 retval += sizeof(struct input_event_compat);
178 }
179
180 return retval;
181}
182#endif
183
148static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) 184static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
149{ 185{
150 struct evdev_list *list = file->private_data; 186 struct evdev_list *list = file->private_data;
@@ -153,6 +189,11 @@ static ssize_t evdev_write(struct file * file, const char __user * buffer, size_
153 189
154 if (!list->evdev->exist) return -ENODEV; 190 if (!list->evdev->exist) return -ENODEV;
155 191
192#ifdef CONFIG_COMPAT
193 if (COMPAT_TEST)
194 return evdev_write_compat(file, buffer, count, ppos);
195#endif
196
156 while (retval < count) { 197 while (retval < count) {
157 198
158 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event))) 199 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
@@ -164,11 +205,56 @@ static ssize_t evdev_write(struct file * file, const char __user * buffer, size_
164 return retval; 205 return retval;
165} 206}
166 207
208#ifdef CONFIG_COMPAT
209static ssize_t evdev_read_compat(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
210{
211 struct evdev_list *list = file->private_data;
212 int retval;
213
214 if (count < sizeof(struct input_event_compat))
215 return -EINVAL;
216
217 if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
218 return -EAGAIN;
219
220 retval = wait_event_interruptible(list->evdev->wait,
221 list->head != list->tail || (!list->evdev->exist));
222
223 if (retval)
224 return retval;
225
226 if (!list->evdev->exist)
227 return -ENODEV;
228
229 while (list->head != list->tail && retval + sizeof(struct input_event_compat) <= count) {
230 struct input_event *event = (struct input_event *) list->buffer + list->tail;
231 struct input_event_compat event_compat;
232 event_compat.time.tv_sec = event->time.tv_sec;
233 event_compat.time.tv_usec = event->time.tv_usec;
234 event_compat.type = event->type;
235 event_compat.code = event->code;
236 event_compat.value = event->value;
237
238 if (copy_to_user(buffer + retval, &event_compat,
239 sizeof(struct input_event_compat))) return -EFAULT;
240 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
241 retval += sizeof(struct input_event_compat);
242 }
243
244 return retval;
245}
246#endif
247
167static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) 248static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
168{ 249{
169 struct evdev_list *list = file->private_data; 250 struct evdev_list *list = file->private_data;
170 int retval; 251 int retval;
171 252
253#ifdef CONFIG_COMPAT
254 if (COMPAT_TEST)
255 return evdev_read_compat(file, buffer, count, ppos);
256#endif
257
172 if (count < sizeof(struct input_event)) 258 if (count < sizeof(struct input_event))
173 return -EINVAL; 259 return -EINVAL;
174 260
@@ -186,7 +272,7 @@ static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count
186 272
187 while (list->head != list->tail && retval + sizeof(struct input_event) <= count) { 273 while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
188 if (copy_to_user(buffer + retval, list->buffer + list->tail, 274 if (copy_to_user(buffer + retval, list->buffer + list->tail,
189 sizeof(struct input_event))) return -EFAULT; 275 sizeof(struct input_event))) return -EFAULT;
190 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); 276 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
191 retval += sizeof(struct input_event); 277 retval += sizeof(struct input_event);
192 } 278 }
@@ -203,7 +289,7 @@ static unsigned int evdev_poll(struct file *file, poll_table *wait)
203 (list->evdev->exist ? 0 : (POLLHUP | POLLERR)); 289 (list->evdev->exist ? 0 : (POLLHUP | POLLERR));
204} 290}
205 291
206static int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) 292static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
207{ 293{
208 struct evdev_list *list = file->private_data; 294 struct evdev_list *list = file->private_data;
209 struct evdev *evdev = list->evdev; 295 struct evdev *evdev = list->evdev;
@@ -285,109 +371,267 @@ static int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
285 371
286 default: 372 default:
287 373
288 if (_IOC_TYPE(cmd) != 'E' || _IOC_DIR(cmd) != _IOC_READ) 374 if (_IOC_TYPE(cmd) != 'E')
289 return -EINVAL; 375 return -EINVAL;
290 376
291 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { 377 if (_IOC_DIR(cmd) == _IOC_READ) {
292 378
293 long *bits; 379 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
294 int len; 380
295 381 long *bits;
296 switch (_IOC_NR(cmd) & EV_MAX) { 382 int len;
297 case 0: bits = dev->evbit; len = EV_MAX; break; 383
298 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; 384 switch (_IOC_NR(cmd) & EV_MAX) {
299 case EV_REL: bits = dev->relbit; len = REL_MAX; break; 385 case 0: bits = dev->evbit; len = EV_MAX; break;
300 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; 386 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
301 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; 387 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
302 case EV_LED: bits = dev->ledbit; len = LED_MAX; break; 388 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
303 case EV_SND: bits = dev->sndbit; len = SND_MAX; break; 389 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
304 case EV_FF: bits = dev->ffbit; len = FF_MAX; break; 390 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
305 default: return -EINVAL; 391 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
392 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
393 default: return -EINVAL;
394 }
395 len = NBITS(len) * sizeof(long);
396 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
397 return copy_to_user(p, bits, len) ? -EFAULT : len;
306 } 398 }
307 len = NBITS(len) * sizeof(long);
308 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
309 return copy_to_user(p, bits, len) ? -EFAULT : len;
310 }
311 399
312 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) { 400 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
313 int len; 401 int len;
314 len = NBITS(KEY_MAX) * sizeof(long); 402 len = NBITS(KEY_MAX) * sizeof(long);
315 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 403 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
316 return copy_to_user(p, dev->key, len) ? -EFAULT : len; 404 return copy_to_user(p, dev->key, len) ? -EFAULT : len;
317 } 405 }
318 406
319 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) { 407 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
320 int len; 408 int len;
321 len = NBITS(LED_MAX) * sizeof(long); 409 len = NBITS(LED_MAX) * sizeof(long);
322 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 410 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
323 return copy_to_user(p, dev->led, len) ? -EFAULT : len; 411 return copy_to_user(p, dev->led, len) ? -EFAULT : len;
324 } 412 }
325 413
326 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) { 414 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
327 int len; 415 int len;
328 len = NBITS(SND_MAX) * sizeof(long); 416 len = NBITS(SND_MAX) * sizeof(long);
329 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 417 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
330 return copy_to_user(p, dev->snd, len) ? -EFAULT : len; 418 return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
331 } 419 }
332 420
333 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { 421 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
334 int len; 422 int len;
335 if (!dev->name) return -ENOENT; 423 if (!dev->name) return -ENOENT;
336 len = strlen(dev->name) + 1; 424 len = strlen(dev->name) + 1;
337 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 425 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
338 return copy_to_user(p, dev->name, len) ? -EFAULT : len; 426 return copy_to_user(p, dev->name, len) ? -EFAULT : len;
339 } 427 }
428
429 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
430 int len;
431 if (!dev->phys) return -ENOENT;
432 len = strlen(dev->phys) + 1;
433 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
434 return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
435 }
436
437 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
438 int len;
439 if (!dev->uniq) return -ENOENT;
440 len = strlen(dev->uniq) + 1;
441 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
442 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
443 }
444
445 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
446
447 int t = _IOC_NR(cmd) & ABS_MAX;
448
449 abs.value = dev->abs[t];
450 abs.minimum = dev->absmin[t];
451 abs.maximum = dev->absmax[t];
452 abs.fuzz = dev->absfuzz[t];
453 abs.flat = dev->absflat[t];
454
455 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
456 return -EFAULT;
457
458 return 0;
459 }
340 460
341 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
342 int len;
343 if (!dev->phys) return -ENOENT;
344 len = strlen(dev->phys) + 1;
345 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
346 return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
347 } 461 }
348 462
349 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { 463 if (_IOC_DIR(cmd) == _IOC_WRITE) {
350 int len; 464
351 if (!dev->uniq) return -ENOENT; 465 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
352 len = strlen(dev->uniq) + 1; 466
353 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); 467 int t = _IOC_NR(cmd) & ABS_MAX;
354 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len; 468
469 if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
470 return -EFAULT;
471
472 dev->abs[t] = abs.value;
473 dev->absmin[t] = abs.minimum;
474 dev->absmax[t] = abs.maximum;
475 dev->absfuzz[t] = abs.fuzz;
476 dev->absflat[t] = abs.flat;
477
478 return 0;
479 }
355 } 480 }
481 }
482 return -EINVAL;
483}
356 484
357 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { 485#ifdef CONFIG_COMPAT
486
487#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
488#define NBITS_COMPAT(x) ((((x)-1)/BITS_PER_LONG_COMPAT)+1)
489#define OFF_COMPAT(x) ((x)%BITS_PER_LONG_COMPAT)
490#define BIT_COMPAT(x) (1UL<<OFF_COMPAT(x))
491#define LONG_COMPAT(x) ((x)/BITS_PER_LONG_COMPAT)
492#define test_bit_compat(bit, array) ((array[LONG_COMPAT(bit)] >> OFF_COMPAT(bit)) & 1)
493
494#ifdef __BIG_ENDIAN
495#define bit_to_user(bit, max) \
496do { \
497 int i; \
498 int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
499 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
500 for (i = 0; i < len / sizeof(compat_long_t); i++) \
501 if (copy_to_user((compat_long_t*) p + i, \
502 (compat_long_t*) (bit) + i + 1 - ((i % 2) << 1), \
503 sizeof(compat_long_t))) \
504 return -EFAULT; \
505 return len; \
506} while (0)
507#else
508#define bit_to_user(bit, max) \
509do { \
510 int len = NBITS_COMPAT((max)) * sizeof(compat_long_t); \
511 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); \
512 return copy_to_user(p, (bit), len) ? -EFAULT : len; \
513} while (0)
514#endif
515
516static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
517{
518 struct evdev_list *list = file->private_data;
519 struct evdev *evdev = list->evdev;
520 struct input_dev *dev = evdev->handle.dev;
521 struct input_absinfo abs;
522 void __user *p = compat_ptr(arg);
358 523
359 int t = _IOC_NR(cmd) & ABS_MAX; 524 if (!evdev->exist) return -ENODEV;
360 525
361 abs.value = dev->abs[t]; 526 switch (cmd) {
362 abs.minimum = dev->absmin[t];
363 abs.maximum = dev->absmax[t];
364 abs.fuzz = dev->absfuzz[t];
365 abs.flat = dev->absflat[t];
366 527
367 if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) 528 case EVIOCGVERSION:
368 return -EFAULT; 529 case EVIOCGID:
530 case EVIOCGKEYCODE:
531 case EVIOCSKEYCODE:
532 case EVIOCSFF:
533 case EVIOCRMFF:
534 case EVIOCGEFFECTS:
535 case EVIOCGRAB:
536 return evdev_ioctl(file, cmd, (unsigned long) p);
369 537
370 return 0; 538 default:
539
540 if (_IOC_TYPE(cmd) != 'E')
541 return -EINVAL;
542
543 if (_IOC_DIR(cmd) == _IOC_READ) {
544
545 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
546 long *bits;
547 int max;
548
549 switch (_IOC_NR(cmd) & EV_MAX) {
550 case 0: bits = dev->evbit; max = EV_MAX; break;
551 case EV_KEY: bits = dev->keybit; max = KEY_MAX; break;
552 case EV_REL: bits = dev->relbit; max = REL_MAX; break;
553 case EV_ABS: bits = dev->absbit; max = ABS_MAX; break;
554 case EV_MSC: bits = dev->mscbit; max = MSC_MAX; break;
555 case EV_LED: bits = dev->ledbit; max = LED_MAX; break;
556 case EV_SND: bits = dev->sndbit; max = SND_MAX; break;
557 case EV_FF: bits = dev->ffbit; max = FF_MAX; break;
558 default: return -EINVAL;
559 }
560 bit_to_user(bits, max);
561 }
562
563 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
564 bit_to_user(dev->key, KEY_MAX);
565
566 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
567 bit_to_user(dev->led, LED_MAX);
568
569 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
570 bit_to_user(dev->snd, SND_MAX);
571
572 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
573 int len;
574 if (!dev->name) return -ENOENT;
575 len = strlen(dev->name) + 1;
576 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
577 return copy_to_user(p, dev->name, len) ? -EFAULT : len;
578 }
579
580 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
581 int len;
582 if (!dev->phys) return -ENOENT;
583 len = strlen(dev->phys) + 1;
584 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
585 return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
586 }
587
588 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
589 int len;
590 if (!dev->uniq) return -ENOENT;
591 len = strlen(dev->uniq) + 1;
592 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
593 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
594 }
595
596 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
597
598 int t = _IOC_NR(cmd) & ABS_MAX;
599
600 abs.value = dev->abs[t];
601 abs.minimum = dev->absmin[t];
602 abs.maximum = dev->absmax[t];
603 abs.fuzz = dev->absfuzz[t];
604 abs.flat = dev->absflat[t];
605
606 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
607 return -EFAULT;
608
609 return 0;
610 }
371 } 611 }
372 612
373 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { 613 if (_IOC_DIR(cmd) == _IOC_WRITE) {
374 614
375 int t = _IOC_NR(cmd) & ABS_MAX; 615 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
376 616
377 if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) 617 int t = _IOC_NR(cmd) & ABS_MAX;
378 return -EFAULT;
379 618
380 dev->abs[t] = abs.value; 619 if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
381 dev->absmin[t] = abs.minimum; 620 return -EFAULT;
382 dev->absmax[t] = abs.maximum;
383 dev->absfuzz[t] = abs.fuzz;
384 dev->absflat[t] = abs.flat;
385 621
386 return 0; 622 dev->abs[t] = abs.value;
623 dev->absmin[t] = abs.minimum;
624 dev->absmax[t] = abs.maximum;
625 dev->absfuzz[t] = abs.fuzz;
626 dev->absflat[t] = abs.flat;
627
628 return 0;
629 }
387 } 630 }
388 } 631 }
389 return -EINVAL; 632 return -EINVAL;
390} 633}
634#endif
391 635
392static struct file_operations evdev_fops = { 636static struct file_operations evdev_fops = {
393 .owner = THIS_MODULE, 637 .owner = THIS_MODULE,
@@ -396,7 +640,10 @@ static struct file_operations evdev_fops = {
396 .poll = evdev_poll, 640 .poll = evdev_poll,
397 .open = evdev_open, 641 .open = evdev_open,
398 .release = evdev_release, 642 .release = evdev_release,
399 .ioctl = evdev_ioctl, 643 .unlocked_ioctl = evdev_ioctl,
644#ifdef CONFIG_COMPAT
645 .compat_ioctl = evdev_ioctl_compat,
646#endif
400 .fasync = evdev_fasync, 647 .fasync = evdev_fasync,
401 .flush = evdev_flush 648 .flush = evdev_flush
402}; 649};
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-21 07:28:57 -0400