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[mirror_ubuntu-jammy-kernel.git] / drivers / input / joydev.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Joystick device driver for the input driver suite.
4 *
5 * Copyright (c) 1999-2002 Vojtech Pavlik
6 * Copyright (c) 1999 Colin Van Dyke
7 */
8
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11 #include <asm/io.h>
12 #include <linux/delay.h>
13 #include <linux/errno.h>
14 #include <linux/joystick.h>
15 #include <linux/input.h>
16 #include <linux/kernel.h>
17 #include <linux/major.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/mm.h>
21 #include <linux/module.h>
22 #include <linux/poll.h>
23 #include <linux/init.h>
24 #include <linux/device.h>
25 #include <linux/cdev.h>
26
27 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
28 MODULE_DESCRIPTION("Joystick device interfaces");
29 MODULE_LICENSE("GPL");
30
31 #define JOYDEV_MINOR_BASE 0
32 #define JOYDEV_MINORS 16
33 #define JOYDEV_BUFFER_SIZE 64
34
35 struct joydev {
36 int open;
37 struct input_handle handle;
38 wait_queue_head_t wait;
39 struct list_head client_list;
40 spinlock_t client_lock; /* protects client_list */
41 struct mutex mutex;
42 struct device dev;
43 struct cdev cdev;
44 bool exist;
45
46 struct js_corr corr[ABS_CNT];
47 struct JS_DATA_SAVE_TYPE glue;
48 int nabs;
49 int nkey;
50 __u16 keymap[KEY_MAX - BTN_MISC + 1];
51 __u16 keypam[KEY_MAX - BTN_MISC + 1];
52 __u8 absmap[ABS_CNT];
53 __u8 abspam[ABS_CNT];
54 __s16 abs[ABS_CNT];
55 };
56
57 struct joydev_client {
58 struct js_event buffer[JOYDEV_BUFFER_SIZE];
59 int head;
60 int tail;
61 int startup;
62 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
63 struct fasync_struct *fasync;
64 struct joydev *joydev;
65 struct list_head node;
66 };
67
68 static int joydev_correct(int value, struct js_corr *corr)
69 {
70 switch (corr->type) {
71
72 case JS_CORR_NONE:
73 break;
74
75 case JS_CORR_BROKEN:
76 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
77 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
78 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
79 break;
80
81 default:
82 return 0;
83 }
84
85 return clamp(value, -32767, 32767);
86 }
87
88 static void joydev_pass_event(struct joydev_client *client,
89 struct js_event *event)
90 {
91 struct joydev *joydev = client->joydev;
92
93 /*
94 * IRQs already disabled, just acquire the lock
95 */
96 spin_lock(&client->buffer_lock);
97
98 client->buffer[client->head] = *event;
99
100 if (client->startup == joydev->nabs + joydev->nkey) {
101 client->head++;
102 client->head &= JOYDEV_BUFFER_SIZE - 1;
103 if (client->tail == client->head)
104 client->startup = 0;
105 }
106
107 spin_unlock(&client->buffer_lock);
108
109 kill_fasync(&client->fasync, SIGIO, POLL_IN);
110 }
111
112 static void joydev_event(struct input_handle *handle,
113 unsigned int type, unsigned int code, int value)
114 {
115 struct joydev *joydev = handle->private;
116 struct joydev_client *client;
117 struct js_event event;
118
119 switch (type) {
120
121 case EV_KEY:
122 if (code < BTN_MISC || value == 2)
123 return;
124 event.type = JS_EVENT_BUTTON;
125 event.number = joydev->keymap[code - BTN_MISC];
126 event.value = value;
127 break;
128
129 case EV_ABS:
130 event.type = JS_EVENT_AXIS;
131 event.number = joydev->absmap[code];
132 event.value = joydev_correct(value,
133 &joydev->corr[event.number]);
134 if (event.value == joydev->abs[event.number])
135 return;
136 joydev->abs[event.number] = event.value;
137 break;
138
139 default:
140 return;
141 }
142
143 event.time = jiffies_to_msecs(jiffies);
144
145 rcu_read_lock();
146 list_for_each_entry_rcu(client, &joydev->client_list, node)
147 joydev_pass_event(client, &event);
148 rcu_read_unlock();
149
150 wake_up_interruptible(&joydev->wait);
151 }
152
153 static int joydev_fasync(int fd, struct file *file, int on)
154 {
155 struct joydev_client *client = file->private_data;
156
157 return fasync_helper(fd, file, on, &client->fasync);
158 }
159
160 static void joydev_free(struct device *dev)
161 {
162 struct joydev *joydev = container_of(dev, struct joydev, dev);
163
164 input_put_device(joydev->handle.dev);
165 kfree(joydev);
166 }
167
168 static void joydev_attach_client(struct joydev *joydev,
169 struct joydev_client *client)
170 {
171 spin_lock(&joydev->client_lock);
172 list_add_tail_rcu(&client->node, &joydev->client_list);
173 spin_unlock(&joydev->client_lock);
174 }
175
176 static void joydev_detach_client(struct joydev *joydev,
177 struct joydev_client *client)
178 {
179 spin_lock(&joydev->client_lock);
180 list_del_rcu(&client->node);
181 spin_unlock(&joydev->client_lock);
182 synchronize_rcu();
183 }
184
185 static void joydev_refresh_state(struct joydev *joydev)
186 {
187 struct input_dev *dev = joydev->handle.dev;
188 int i, val;
189
190 for (i = 0; i < joydev->nabs; i++) {
191 val = input_abs_get_val(dev, joydev->abspam[i]);
192 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
193 }
194 }
195
196 static int joydev_open_device(struct joydev *joydev)
197 {
198 int retval;
199
200 retval = mutex_lock_interruptible(&joydev->mutex);
201 if (retval)
202 return retval;
203
204 if (!joydev->exist)
205 retval = -ENODEV;
206 else if (!joydev->open++) {
207 retval = input_open_device(&joydev->handle);
208 if (retval)
209 joydev->open--;
210 else
211 joydev_refresh_state(joydev);
212 }
213
214 mutex_unlock(&joydev->mutex);
215 return retval;
216 }
217
218 static void joydev_close_device(struct joydev *joydev)
219 {
220 mutex_lock(&joydev->mutex);
221
222 if (joydev->exist && !--joydev->open)
223 input_close_device(&joydev->handle);
224
225 mutex_unlock(&joydev->mutex);
226 }
227
228 /*
229 * Wake up users waiting for IO so they can disconnect from
230 * dead device.
231 */
232 static void joydev_hangup(struct joydev *joydev)
233 {
234 struct joydev_client *client;
235
236 spin_lock(&joydev->client_lock);
237 list_for_each_entry(client, &joydev->client_list, node)
238 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
239 spin_unlock(&joydev->client_lock);
240
241 wake_up_interruptible(&joydev->wait);
242 }
243
244 static int joydev_release(struct inode *inode, struct file *file)
245 {
246 struct joydev_client *client = file->private_data;
247 struct joydev *joydev = client->joydev;
248
249 joydev_detach_client(joydev, client);
250 kfree(client);
251
252 joydev_close_device(joydev);
253
254 return 0;
255 }
256
257 static int joydev_open(struct inode *inode, struct file *file)
258 {
259 struct joydev *joydev =
260 container_of(inode->i_cdev, struct joydev, cdev);
261 struct joydev_client *client;
262 int error;
263
264 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
265 if (!client)
266 return -ENOMEM;
267
268 spin_lock_init(&client->buffer_lock);
269 client->joydev = joydev;
270 joydev_attach_client(joydev, client);
271
272 error = joydev_open_device(joydev);
273 if (error)
274 goto err_free_client;
275
276 file->private_data = client;
277 stream_open(inode, file);
278
279 return 0;
280
281 err_free_client:
282 joydev_detach_client(joydev, client);
283 kfree(client);
284 return error;
285 }
286
287 static int joydev_generate_startup_event(struct joydev_client *client,
288 struct input_dev *input,
289 struct js_event *event)
290 {
291 struct joydev *joydev = client->joydev;
292 int have_event;
293
294 spin_lock_irq(&client->buffer_lock);
295
296 have_event = client->startup < joydev->nabs + joydev->nkey;
297
298 if (have_event) {
299
300 event->time = jiffies_to_msecs(jiffies);
301 if (client->startup < joydev->nkey) {
302 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
303 event->number = client->startup;
304 event->value = !!test_bit(joydev->keypam[event->number],
305 input->key);
306 } else {
307 event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
308 event->number = client->startup - joydev->nkey;
309 event->value = joydev->abs[event->number];
310 }
311 client->startup++;
312 }
313
314 spin_unlock_irq(&client->buffer_lock);
315
316 return have_event;
317 }
318
319 static int joydev_fetch_next_event(struct joydev_client *client,
320 struct js_event *event)
321 {
322 int have_event;
323
324 spin_lock_irq(&client->buffer_lock);
325
326 have_event = client->head != client->tail;
327 if (have_event) {
328 *event = client->buffer[client->tail++];
329 client->tail &= JOYDEV_BUFFER_SIZE - 1;
330 }
331
332 spin_unlock_irq(&client->buffer_lock);
333
334 return have_event;
335 }
336
337 /*
338 * Old joystick interface
339 */
340 static ssize_t joydev_0x_read(struct joydev_client *client,
341 struct input_dev *input,
342 char __user *buf)
343 {
344 struct joydev *joydev = client->joydev;
345 struct JS_DATA_TYPE data;
346 int i;
347
348 spin_lock_irq(&input->event_lock);
349
350 /*
351 * Get device state
352 */
353 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
354 data.buttons |=
355 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
356 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
357 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
358
359 /*
360 * Reset reader's event queue
361 */
362 spin_lock(&client->buffer_lock);
363 client->startup = 0;
364 client->tail = client->head;
365 spin_unlock(&client->buffer_lock);
366
367 spin_unlock_irq(&input->event_lock);
368
369 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
370 return -EFAULT;
371
372 return sizeof(struct JS_DATA_TYPE);
373 }
374
375 static inline int joydev_data_pending(struct joydev_client *client)
376 {
377 struct joydev *joydev = client->joydev;
378
379 return client->startup < joydev->nabs + joydev->nkey ||
380 client->head != client->tail;
381 }
382
383 static ssize_t joydev_read(struct file *file, char __user *buf,
384 size_t count, loff_t *ppos)
385 {
386 struct joydev_client *client = file->private_data;
387 struct joydev *joydev = client->joydev;
388 struct input_dev *input = joydev->handle.dev;
389 struct js_event event;
390 int retval;
391
392 if (!joydev->exist)
393 return -ENODEV;
394
395 if (count < sizeof(struct js_event))
396 return -EINVAL;
397
398 if (count == sizeof(struct JS_DATA_TYPE))
399 return joydev_0x_read(client, input, buf);
400
401 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
402 return -EAGAIN;
403
404 retval = wait_event_interruptible(joydev->wait,
405 !joydev->exist || joydev_data_pending(client));
406 if (retval)
407 return retval;
408
409 if (!joydev->exist)
410 return -ENODEV;
411
412 while (retval + sizeof(struct js_event) <= count &&
413 joydev_generate_startup_event(client, input, &event)) {
414
415 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
416 return -EFAULT;
417
418 retval += sizeof(struct js_event);
419 }
420
421 while (retval + sizeof(struct js_event) <= count &&
422 joydev_fetch_next_event(client, &event)) {
423
424 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
425 return -EFAULT;
426
427 retval += sizeof(struct js_event);
428 }
429
430 return retval;
431 }
432
433 /* No kernel lock - fine */
434 static __poll_t joydev_poll(struct file *file, poll_table *wait)
435 {
436 struct joydev_client *client = file->private_data;
437 struct joydev *joydev = client->joydev;
438
439 poll_wait(file, &joydev->wait, wait);
440 return (joydev_data_pending(client) ? (EPOLLIN | EPOLLRDNORM) : 0) |
441 (joydev->exist ? 0 : (EPOLLHUP | EPOLLERR));
442 }
443
444 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
445 void __user *argp, size_t len)
446 {
447 __u8 *abspam;
448 int i;
449 int retval = 0;
450
451 len = min(len, sizeof(joydev->abspam));
452
453 /* Validate the map. */
454 abspam = memdup_user(argp, len);
455 if (IS_ERR(abspam))
456 return PTR_ERR(abspam);
457
458 for (i = 0; i < len && i < joydev->nabs; i++) {
459 if (abspam[i] > ABS_MAX) {
460 retval = -EINVAL;
461 goto out;
462 }
463 }
464
465 memcpy(joydev->abspam, abspam, len);
466
467 for (i = 0; i < joydev->nabs; i++)
468 joydev->absmap[joydev->abspam[i]] = i;
469
470 out:
471 kfree(abspam);
472 return retval;
473 }
474
475 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
476 void __user *argp, size_t len)
477 {
478 __u16 *keypam;
479 int i;
480 int retval = 0;
481
482 if (len % sizeof(*keypam))
483 return -EINVAL;
484
485 len = min(len, sizeof(joydev->keypam));
486
487 /* Validate the map. */
488 keypam = memdup_user(argp, len);
489 if (IS_ERR(keypam))
490 return PTR_ERR(keypam);
491
492 for (i = 0; i < (len / 2) && i < joydev->nkey; i++) {
493 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
494 retval = -EINVAL;
495 goto out;
496 }
497 }
498
499 memcpy(joydev->keypam, keypam, len);
500
501 for (i = 0; i < joydev->nkey; i++)
502 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
503
504 out:
505 kfree(keypam);
506 return retval;
507 }
508
509
510 static int joydev_ioctl_common(struct joydev *joydev,
511 unsigned int cmd, void __user *argp)
512 {
513 struct input_dev *dev = joydev->handle.dev;
514 size_t len;
515 int i;
516 const char *name;
517
518 /* Process fixed-sized commands. */
519 switch (cmd) {
520
521 case JS_SET_CAL:
522 return copy_from_user(&joydev->glue.JS_CORR, argp,
523 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
524
525 case JS_GET_CAL:
526 return copy_to_user(argp, &joydev->glue.JS_CORR,
527 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
528
529 case JS_SET_TIMEOUT:
530 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
531
532 case JS_GET_TIMEOUT:
533 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
534
535 case JSIOCGVERSION:
536 return put_user(JS_VERSION, (__u32 __user *) argp);
537
538 case JSIOCGAXES:
539 return put_user(joydev->nabs, (__u8 __user *) argp);
540
541 case JSIOCGBUTTONS:
542 return put_user(joydev->nkey, (__u8 __user *) argp);
543
544 case JSIOCSCORR:
545 if (copy_from_user(joydev->corr, argp,
546 sizeof(joydev->corr[0]) * joydev->nabs))
547 return -EFAULT;
548
549 for (i = 0; i < joydev->nabs; i++) {
550 int val = input_abs_get_val(dev, joydev->abspam[i]);
551 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
552 }
553 return 0;
554
555 case JSIOCGCORR:
556 return copy_to_user(argp, joydev->corr,
557 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
558
559 }
560
561 /*
562 * Process variable-sized commands (the axis and button map commands
563 * are considered variable-sized to decouple them from the values of
564 * ABS_MAX and KEY_MAX).
565 */
566 switch (cmd & ~IOCSIZE_MASK) {
567
568 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
569 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
570
571 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
572 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
573 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
574
575 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
576 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
577
578 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
579 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
580 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
581
582 case JSIOCGNAME(0):
583 name = dev->name;
584 if (!name)
585 return 0;
586
587 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
588 return copy_to_user(argp, name, len) ? -EFAULT : len;
589 }
590
591 return -EINVAL;
592 }
593
594 #ifdef CONFIG_COMPAT
595 static long joydev_compat_ioctl(struct file *file,
596 unsigned int cmd, unsigned long arg)
597 {
598 struct joydev_client *client = file->private_data;
599 struct joydev *joydev = client->joydev;
600 void __user *argp = (void __user *)arg;
601 s32 tmp32;
602 struct JS_DATA_SAVE_TYPE_32 ds32;
603 int retval;
604
605 retval = mutex_lock_interruptible(&joydev->mutex);
606 if (retval)
607 return retval;
608
609 if (!joydev->exist) {
610 retval = -ENODEV;
611 goto out;
612 }
613
614 switch (cmd) {
615
616 case JS_SET_TIMELIMIT:
617 retval = get_user(tmp32, (s32 __user *) arg);
618 if (retval == 0)
619 joydev->glue.JS_TIMELIMIT = tmp32;
620 break;
621
622 case JS_GET_TIMELIMIT:
623 tmp32 = joydev->glue.JS_TIMELIMIT;
624 retval = put_user(tmp32, (s32 __user *) arg);
625 break;
626
627 case JS_SET_ALL:
628 retval = copy_from_user(&ds32, argp,
629 sizeof(ds32)) ? -EFAULT : 0;
630 if (retval == 0) {
631 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
632 joydev->glue.BUSY = ds32.BUSY;
633 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
634 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
635 joydev->glue.JS_SAVE = ds32.JS_SAVE;
636 joydev->glue.JS_CORR = ds32.JS_CORR;
637 }
638 break;
639
640 case JS_GET_ALL:
641 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
642 ds32.BUSY = joydev->glue.BUSY;
643 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
644 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
645 ds32.JS_SAVE = joydev->glue.JS_SAVE;
646 ds32.JS_CORR = joydev->glue.JS_CORR;
647
648 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
649 break;
650
651 default:
652 retval = joydev_ioctl_common(joydev, cmd, argp);
653 break;
654 }
655
656 out:
657 mutex_unlock(&joydev->mutex);
658 return retval;
659 }
660 #endif /* CONFIG_COMPAT */
661
662 static long joydev_ioctl(struct file *file,
663 unsigned int cmd, unsigned long arg)
664 {
665 struct joydev_client *client = file->private_data;
666 struct joydev *joydev = client->joydev;
667 void __user *argp = (void __user *)arg;
668 int retval;
669
670 retval = mutex_lock_interruptible(&joydev->mutex);
671 if (retval)
672 return retval;
673
674 if (!joydev->exist) {
675 retval = -ENODEV;
676 goto out;
677 }
678
679 switch (cmd) {
680
681 case JS_SET_TIMELIMIT:
682 retval = get_user(joydev->glue.JS_TIMELIMIT,
683 (long __user *) arg);
684 break;
685
686 case JS_GET_TIMELIMIT:
687 retval = put_user(joydev->glue.JS_TIMELIMIT,
688 (long __user *) arg);
689 break;
690
691 case JS_SET_ALL:
692 retval = copy_from_user(&joydev->glue, argp,
693 sizeof(joydev->glue)) ? -EFAULT : 0;
694 break;
695
696 case JS_GET_ALL:
697 retval = copy_to_user(argp, &joydev->glue,
698 sizeof(joydev->glue)) ? -EFAULT : 0;
699 break;
700
701 default:
702 retval = joydev_ioctl_common(joydev, cmd, argp);
703 break;
704 }
705 out:
706 mutex_unlock(&joydev->mutex);
707 return retval;
708 }
709
710 static const struct file_operations joydev_fops = {
711 .owner = THIS_MODULE,
712 .read = joydev_read,
713 .poll = joydev_poll,
714 .open = joydev_open,
715 .release = joydev_release,
716 .unlocked_ioctl = joydev_ioctl,
717 #ifdef CONFIG_COMPAT
718 .compat_ioctl = joydev_compat_ioctl,
719 #endif
720 .fasync = joydev_fasync,
721 .llseek = no_llseek,
722 };
723
724 /*
725 * Mark device non-existent. This disables writes, ioctls and
726 * prevents new users from opening the device. Already posted
727 * blocking reads will stay, however new ones will fail.
728 */
729 static void joydev_mark_dead(struct joydev *joydev)
730 {
731 mutex_lock(&joydev->mutex);
732 joydev->exist = false;
733 mutex_unlock(&joydev->mutex);
734 }
735
736 static void joydev_cleanup(struct joydev *joydev)
737 {
738 struct input_handle *handle = &joydev->handle;
739
740 joydev_mark_dead(joydev);
741 joydev_hangup(joydev);
742
743 /* joydev is marked dead so no one else accesses joydev->open */
744 if (joydev->open)
745 input_close_device(handle);
746 }
747
748 /*
749 * These codes are copied from from hid-ids.h, unfortunately there is no common
750 * usb_ids/bt_ids.h header.
751 */
752 #define USB_VENDOR_ID_SONY 0x054c
753 #define USB_DEVICE_ID_SONY_PS3_CONTROLLER 0x0268
754 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER 0x05c4
755 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER_2 0x09cc
756 #define USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE 0x0ba0
757
758 #define USB_VENDOR_ID_THQ 0x20d6
759 #define USB_DEVICE_ID_THQ_PS3_UDRAW 0xcb17
760
761 #define ACCEL_DEV(vnd, prd) \
762 { \
763 .flags = INPUT_DEVICE_ID_MATCH_VENDOR | \
764 INPUT_DEVICE_ID_MATCH_PRODUCT | \
765 INPUT_DEVICE_ID_MATCH_PROPBIT, \
766 .vendor = (vnd), \
767 .product = (prd), \
768 .propbit = { BIT_MASK(INPUT_PROP_ACCELEROMETER) }, \
769 }
770
771 static const struct input_device_id joydev_blacklist[] = {
772 /* Avoid touchpads and touchscreens */
773 {
774 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
775 INPUT_DEVICE_ID_MATCH_KEYBIT,
776 .evbit = { BIT_MASK(EV_KEY) },
777 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
778 },
779 /* Avoid tablets, digitisers and similar devices */
780 {
781 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
782 INPUT_DEVICE_ID_MATCH_KEYBIT,
783 .evbit = { BIT_MASK(EV_KEY) },
784 .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) },
785 },
786 /* Disable accelerometers on composite devices */
787 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS3_CONTROLLER),
788 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER),
789 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_2),
790 ACCEL_DEV(USB_VENDOR_ID_SONY, USB_DEVICE_ID_SONY_PS4_CONTROLLER_DONGLE),
791 ACCEL_DEV(USB_VENDOR_ID_THQ, USB_DEVICE_ID_THQ_PS3_UDRAW),
792 { /* sentinel */ }
793 };
794
795 static bool joydev_dev_is_blacklisted(struct input_dev *dev)
796 {
797 const struct input_device_id *id;
798
799 for (id = joydev_blacklist; id->flags; id++) {
800 if (input_match_device_id(dev, id)) {
801 dev_dbg(&dev->dev,
802 "joydev: blacklisting '%s'\n", dev->name);
803 return true;
804 }
805 }
806
807 return false;
808 }
809
810 static bool joydev_dev_is_absolute_mouse(struct input_dev *dev)
811 {
812 DECLARE_BITMAP(jd_scratch, KEY_CNT);
813 bool ev_match = false;
814
815 BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT);
816
817 /*
818 * Virtualization (VMware, etc) and remote management (HP
819 * ILO2) solutions use absolute coordinates for their virtual
820 * pointing devices so that there is one-to-one relationship
821 * between pointer position on the host screen and virtual
822 * guest screen, and so their mice use ABS_X, ABS_Y and 3
823 * primary button events. This clashes with what joydev
824 * considers to be joysticks (a device with at minimum ABS_X
825 * axis).
826 *
827 * Here we are trying to separate absolute mice from
828 * joysticks. A device is, for joystick detection purposes,
829 * considered to be an absolute mouse if the following is
830 * true:
831 *
832 * 1) Event types are exactly
833 * EV_ABS, EV_KEY and EV_SYN
834 * or
835 * EV_ABS, EV_KEY, EV_SYN and EV_MSC
836 * or
837 * EV_ABS, EV_KEY, EV_SYN, EV_MSC and EV_REL.
838 * 2) Absolute events are exactly ABS_X and ABS_Y.
839 * 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE.
840 * 4) Device is not on "Amiga" bus.
841 */
842
843 bitmap_zero(jd_scratch, EV_CNT);
844 /* VMware VMMouse, HP ILO2 */
845 __set_bit(EV_ABS, jd_scratch);
846 __set_bit(EV_KEY, jd_scratch);
847 __set_bit(EV_SYN, jd_scratch);
848 if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
849 ev_match = true;
850
851 /* HP ILO2, AMI BMC firmware */
852 __set_bit(EV_MSC, jd_scratch);
853 if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
854 ev_match = true;
855
856 /* VMware Virtual USB Mouse, QEMU USB Tablet, ATEN BMC firmware */
857 __set_bit(EV_REL, jd_scratch);
858 if (bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
859 ev_match = true;
860
861 if (!ev_match)
862 return false;
863
864 bitmap_zero(jd_scratch, ABS_CNT);
865 __set_bit(ABS_X, jd_scratch);
866 __set_bit(ABS_Y, jd_scratch);
867 if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT))
868 return false;
869
870 bitmap_zero(jd_scratch, KEY_CNT);
871 __set_bit(BTN_LEFT, jd_scratch);
872 __set_bit(BTN_RIGHT, jd_scratch);
873 __set_bit(BTN_MIDDLE, jd_scratch);
874
875 if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT))
876 return false;
877
878 /*
879 * Amiga joystick (amijoy) historically uses left/middle/right
880 * button events.
881 */
882 if (dev->id.bustype == BUS_AMIGA)
883 return false;
884
885 return true;
886 }
887
888 static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
889 {
890 /* Disable blacklisted devices */
891 if (joydev_dev_is_blacklisted(dev))
892 return false;
893
894 /* Avoid absolute mice */
895 if (joydev_dev_is_absolute_mouse(dev))
896 return false;
897
898 return true;
899 }
900
901 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
902 const struct input_device_id *id)
903 {
904 struct joydev *joydev;
905 int i, j, t, minor, dev_no;
906 int error;
907
908 minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true);
909 if (minor < 0) {
910 error = minor;
911 pr_err("failed to reserve new minor: %d\n", error);
912 return error;
913 }
914
915 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
916 if (!joydev) {
917 error = -ENOMEM;
918 goto err_free_minor;
919 }
920
921 INIT_LIST_HEAD(&joydev->client_list);
922 spin_lock_init(&joydev->client_lock);
923 mutex_init(&joydev->mutex);
924 init_waitqueue_head(&joydev->wait);
925 joydev->exist = true;
926
927 dev_no = minor;
928 /* Normalize device number if it falls into legacy range */
929 if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS)
930 dev_no -= JOYDEV_MINOR_BASE;
931 dev_set_name(&joydev->dev, "js%d", dev_no);
932
933 joydev->handle.dev = input_get_device(dev);
934 joydev->handle.name = dev_name(&joydev->dev);
935 joydev->handle.handler = handler;
936 joydev->handle.private = joydev;
937
938 for_each_set_bit(i, dev->absbit, ABS_CNT) {
939 joydev->absmap[i] = joydev->nabs;
940 joydev->abspam[joydev->nabs] = i;
941 joydev->nabs++;
942 }
943
944 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
945 if (test_bit(i + BTN_MISC, dev->keybit)) {
946 joydev->keymap[i] = joydev->nkey;
947 joydev->keypam[joydev->nkey] = i + BTN_MISC;
948 joydev->nkey++;
949 }
950
951 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
952 if (test_bit(i + BTN_MISC, dev->keybit)) {
953 joydev->keymap[i] = joydev->nkey;
954 joydev->keypam[joydev->nkey] = i + BTN_MISC;
955 joydev->nkey++;
956 }
957
958 for (i = 0; i < joydev->nabs; i++) {
959 j = joydev->abspam[i];
960 if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
961 joydev->corr[i].type = JS_CORR_NONE;
962 continue;
963 }
964 joydev->corr[i].type = JS_CORR_BROKEN;
965 joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
966
967 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
968 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
969 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
970
971 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
972 - 2 * input_abs_get_flat(dev, j);
973 if (t) {
974 joydev->corr[i].coef[2] = (1 << 29) / t;
975 joydev->corr[i].coef[3] = (1 << 29) / t;
976 }
977 }
978
979 joydev->dev.devt = MKDEV(INPUT_MAJOR, minor);
980 joydev->dev.class = &input_class;
981 joydev->dev.parent = &dev->dev;
982 joydev->dev.release = joydev_free;
983 device_initialize(&joydev->dev);
984
985 error = input_register_handle(&joydev->handle);
986 if (error)
987 goto err_free_joydev;
988
989 cdev_init(&joydev->cdev, &joydev_fops);
990
991 error = cdev_device_add(&joydev->cdev, &joydev->dev);
992 if (error)
993 goto err_cleanup_joydev;
994
995 return 0;
996
997 err_cleanup_joydev:
998 joydev_cleanup(joydev);
999 input_unregister_handle(&joydev->handle);
1000 err_free_joydev:
1001 put_device(&joydev->dev);
1002 err_free_minor:
1003 input_free_minor(minor);
1004 return error;
1005 }
1006
1007 static void joydev_disconnect(struct input_handle *handle)
1008 {
1009 struct joydev *joydev = handle->private;
1010
1011 cdev_device_del(&joydev->cdev, &joydev->dev);
1012 joydev_cleanup(joydev);
1013 input_free_minor(MINOR(joydev->dev.devt));
1014 input_unregister_handle(handle);
1015 put_device(&joydev->dev);
1016 }
1017
1018 static const struct input_device_id joydev_ids[] = {
1019 {
1020 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1021 INPUT_DEVICE_ID_MATCH_ABSBIT,
1022 .evbit = { BIT_MASK(EV_ABS) },
1023 .absbit = { BIT_MASK(ABS_X) },
1024 },
1025 {
1026 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1027 INPUT_DEVICE_ID_MATCH_ABSBIT,
1028 .evbit = { BIT_MASK(EV_ABS) },
1029 .absbit = { BIT_MASK(ABS_Z) },
1030 },
1031 {
1032 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1033 INPUT_DEVICE_ID_MATCH_ABSBIT,
1034 .evbit = { BIT_MASK(EV_ABS) },
1035 .absbit = { BIT_MASK(ABS_WHEEL) },
1036 },
1037 {
1038 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1039 INPUT_DEVICE_ID_MATCH_ABSBIT,
1040 .evbit = { BIT_MASK(EV_ABS) },
1041 .absbit = { BIT_MASK(ABS_THROTTLE) },
1042 },
1043 {
1044 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1045 INPUT_DEVICE_ID_MATCH_KEYBIT,
1046 .evbit = { BIT_MASK(EV_KEY) },
1047 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
1048 },
1049 {
1050 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1051 INPUT_DEVICE_ID_MATCH_KEYBIT,
1052 .evbit = { BIT_MASK(EV_KEY) },
1053 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
1054 },
1055 {
1056 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
1057 INPUT_DEVICE_ID_MATCH_KEYBIT,
1058 .evbit = { BIT_MASK(EV_KEY) },
1059 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
1060 },
1061 { } /* Terminating entry */
1062 };
1063
1064 MODULE_DEVICE_TABLE(input, joydev_ids);
1065
1066 static struct input_handler joydev_handler = {
1067 .event = joydev_event,
1068 .match = joydev_match,
1069 .connect = joydev_connect,
1070 .disconnect = joydev_disconnect,
1071 .legacy_minors = true,
1072 .minor = JOYDEV_MINOR_BASE,
1073 .name = "joydev",
1074 .id_table = joydev_ids,
1075 };
1076
1077 static int __init joydev_init(void)
1078 {
1079 return input_register_handler(&joydev_handler);
1080 }
1081
1082 static void __exit joydev_exit(void)
1083 {
1084 input_unregister_handler(&joydev_handler);
1085 }
1086
1087 module_init(joydev_init);
1088 module_exit(joydev_exit);
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