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Merge tag 'kvm-4.14-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[linux/fpc-iii.git] / drivers / input / joydev.c
blob29d677c714d25fa2fca5d41713f32a5a9fe3e64f
1 /*
2 * Joystick device driver for the input driver suite.
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 * Copyright (c) 1999 Colin Van Dyke
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <asm/io.h>
16 #include <linux/delay.h>
17 #include <linux/errno.h>
18 #include <linux/joystick.h>
19 #include <linux/input.h>
20 #include <linux/kernel.h>
21 #include <linux/major.h>
22 #include <linux/sched.h>
23 #include <linux/slab.h>
24 #include <linux/mm.h>
25 #include <linux/module.h>
26 #include <linux/poll.h>
27 #include <linux/init.h>
28 #include <linux/device.h>
29 #include <linux/cdev.h>
30
31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
32 MODULE_DESCRIPTION("Joystick device interfaces");
33 MODULE_SUPPORTED_DEVICE("input/js");
34 MODULE_LICENSE("GPL");
35
36 #define JOYDEV_MINOR_BASE 0
37 #define JOYDEV_MINORS 16
38 #define JOYDEV_BUFFER_SIZE 64
39
40 struct joydev {
41 int open;
42 struct input_handle handle;
43 wait_queue_head_t wait;
44 struct list_head client_list;
45 spinlock_t client_lock; /* protects client_list */
46 struct mutex mutex;
47 struct device dev;
48 struct cdev cdev;
49 bool exist;
50
51 struct js_corr corr[ABS_CNT];
52 struct JS_DATA_SAVE_TYPE glue;
53 int nabs;
54 int nkey;
55 __u16 keymap[KEY_MAX - BTN_MISC + 1];
56 __u16 keypam[KEY_MAX - BTN_MISC + 1];
57 __u8 absmap[ABS_CNT];
58 __u8 abspam[ABS_CNT];
59 __s16 abs[ABS_CNT];
60 };
61
62 struct joydev_client {
63 struct js_event buffer[JOYDEV_BUFFER_SIZE];
64 int head;
65 int tail;
66 int startup;
67 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
68 struct fasync_struct *fasync;
69 struct joydev *joydev;
70 struct list_head node;
71 };
72
73 static int joydev_correct(int value, struct js_corr *corr)
74 {
75 switch (corr->type) {
76
77 case JS_CORR_NONE:
78 break;
79
80 case JS_CORR_BROKEN:
81 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
82 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
83 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
84 break;
85
86 default:
87 return 0;
88 }
89
90 return clamp(value, -32767, 32767);
91 }
92
93 static void joydev_pass_event(struct joydev_client *client,
94 struct js_event *event)
95 {
96 struct joydev *joydev = client->joydev;
97
98 /*
99 * IRQs already disabled, just acquire the lock
100 */
101 spin_lock(&client->buffer_lock);
102
103 client->buffer[client->head] = *event;
104
105 if (client->startup == joydev->nabs + joydev->nkey) {
106 client->head++;
107 client->head &= JOYDEV_BUFFER_SIZE - 1;
108 if (client->tail == client->head)
109 client->startup = 0;
110 }
111
112 spin_unlock(&client->buffer_lock);
113
114 kill_fasync(&client->fasync, SIGIO, POLL_IN);
115 }
116
117 static void joydev_event(struct input_handle *handle,
118 unsigned int type, unsigned int code, int value)
119 {
120 struct joydev *joydev = handle->private;
121 struct joydev_client *client;
122 struct js_event event;
123
124 switch (type) {
125
126 case EV_KEY:
127 if (code < BTN_MISC || value == 2)
128 return;
129 event.type = JS_EVENT_BUTTON;
130 event.number = joydev->keymap[code - BTN_MISC];
131 event.value = value;
132 break;
133
134 case EV_ABS:
135 event.type = JS_EVENT_AXIS;
136 event.number = joydev->absmap[code];
137 event.value = joydev_correct(value,
138 &joydev->corr[event.number]);
139 if (event.value == joydev->abs[event.number])
140 return;
141 joydev->abs[event.number] = event.value;
142 break;
143
144 default:
145 return;
146 }
147
148 event.time = jiffies_to_msecs(jiffies);
149
150 rcu_read_lock();
151 list_for_each_entry_rcu(client, &joydev->client_list, node)
152 joydev_pass_event(client, &event);
153 rcu_read_unlock();
154
155 wake_up_interruptible(&joydev->wait);
156 }
157
158 static int joydev_fasync(int fd, struct file *file, int on)
159 {
160 struct joydev_client *client = file->private_data;
161
162 return fasync_helper(fd, file, on, &client->fasync);
163 }
164
165 static void joydev_free(struct device *dev)
166 {
167 struct joydev *joydev = container_of(dev, struct joydev, dev);
168
169 input_put_device(joydev->handle.dev);
170 kfree(joydev);
171 }
172
173 static void joydev_attach_client(struct joydev *joydev,
174 struct joydev_client *client)
175 {
176 spin_lock(&joydev->client_lock);
177 list_add_tail_rcu(&client->node, &joydev->client_list);
178 spin_unlock(&joydev->client_lock);
179 }
180
181 static void joydev_detach_client(struct joydev *joydev,
182 struct joydev_client *client)
183 {
184 spin_lock(&joydev->client_lock);
185 list_del_rcu(&client->node);
186 spin_unlock(&joydev->client_lock);
187 synchronize_rcu();
188 }
189
190 static void joydev_refresh_state(struct joydev *joydev)
191 {
192 struct input_dev *dev = joydev->handle.dev;
193 int i, val;
194
195 for (i = 0; i < joydev->nabs; i++) {
196 val = input_abs_get_val(dev, joydev->abspam[i]);
197 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
198 }
199 }
200
201 static int joydev_open_device(struct joydev *joydev)
202 {
203 int retval;
204
205 retval = mutex_lock_interruptible(&joydev->mutex);
206 if (retval)
207 return retval;
208
209 if (!joydev->exist)
210 retval = -ENODEV;
211 else if (!joydev->open++) {
212 retval = input_open_device(&joydev->handle);
213 if (retval)
214 joydev->open--;
215 else
216 joydev_refresh_state(joydev);
217 }
218
219 mutex_unlock(&joydev->mutex);
220 return retval;
221 }
222
223 static void joydev_close_device(struct joydev *joydev)
224 {
225 mutex_lock(&joydev->mutex);
226
227 if (joydev->exist && !--joydev->open)
228 input_close_device(&joydev->handle);
229
230 mutex_unlock(&joydev->mutex);
231 }
232
233 /*
234 * Wake up users waiting for IO so they can disconnect from
235 * dead device.
236 */
237 static void joydev_hangup(struct joydev *joydev)
238 {
239 struct joydev_client *client;
240
241 spin_lock(&joydev->client_lock);
242 list_for_each_entry(client, &joydev->client_list, node)
243 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
244 spin_unlock(&joydev->client_lock);
245
246 wake_up_interruptible(&joydev->wait);
247 }
248
249 static int joydev_release(struct inode *inode, struct file *file)
250 {
251 struct joydev_client *client = file->private_data;
252 struct joydev *joydev = client->joydev;
253
254 joydev_detach_client(joydev, client);
255 kfree(client);
256
257 joydev_close_device(joydev);
258
259 return 0;
260 }
261
262 static int joydev_open(struct inode *inode, struct file *file)
263 {
264 struct joydev *joydev =
265 container_of(inode->i_cdev, struct joydev, cdev);
266 struct joydev_client *client;
267 int error;
268
269 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
270 if (!client)
271 return -ENOMEM;
272
273 spin_lock_init(&client->buffer_lock);
274 client->joydev = joydev;
275 joydev_attach_client(joydev, client);
276
277 error = joydev_open_device(joydev);
278 if (error)
279 goto err_free_client;
280
281 file->private_data = client;
282 nonseekable_open(inode, file);
283
284 return 0;
285
286 err_free_client:
287 joydev_detach_client(joydev, client);
288 kfree(client);
289 return error;
290 }
291
292 static int joydev_generate_startup_event(struct joydev_client *client,
293 struct input_dev *input,
294 struct js_event *event)
295 {
296 struct joydev *joydev = client->joydev;
297 int have_event;
298
299 spin_lock_irq(&client->buffer_lock);
300
301 have_event = client->startup < joydev->nabs + joydev->nkey;
302
303 if (have_event) {
304
305 event->time = jiffies_to_msecs(jiffies);
306 if (client->startup < joydev->nkey) {
307 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
308 event->number = client->startup;
309 event->value = !!test_bit(joydev->keypam[event->number],
310 input->key);
311 } else {
312 event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
313 event->number = client->startup - joydev->nkey;
314 event->value = joydev->abs[event->number];
315 }
316 client->startup++;
317 }
318
319 spin_unlock_irq(&client->buffer_lock);
320
321 return have_event;
322 }
323
324 static int joydev_fetch_next_event(struct joydev_client *client,
325 struct js_event *event)
326 {
327 int have_event;
328
329 spin_lock_irq(&client->buffer_lock);
330
331 have_event = client->head != client->tail;
332 if (have_event) {
333 *event = client->buffer[client->tail++];
334 client->tail &= JOYDEV_BUFFER_SIZE - 1;
335 }
336
337 spin_unlock_irq(&client->buffer_lock);
338
339 return have_event;
340 }
341
342 /*
343 * Old joystick interface
344 */
345 static ssize_t joydev_0x_read(struct joydev_client *client,
346 struct input_dev *input,
347 char __user *buf)
348 {
349 struct joydev *joydev = client->joydev;
350 struct JS_DATA_TYPE data;
351 int i;
352
353 spin_lock_irq(&input->event_lock);
354
355 /*
356 * Get device state
357 */
358 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
359 data.buttons |=
360 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
361 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
362 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
363
364 /*
365 * Reset reader's event queue
366 */
367 spin_lock(&client->buffer_lock);
368 client->startup = 0;
369 client->tail = client->head;
370 spin_unlock(&client->buffer_lock);
371
372 spin_unlock_irq(&input->event_lock);
373
374 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
375 return -EFAULT;
376
377 return sizeof(struct JS_DATA_TYPE);
378 }
379
380 static inline int joydev_data_pending(struct joydev_client *client)
381 {
382 struct joydev *joydev = client->joydev;
383
384 return client->startup < joydev->nabs + joydev->nkey ||
385 client->head != client->tail;
386 }
387
388 static ssize_t joydev_read(struct file *file, char __user *buf,
389 size_t count, loff_t *ppos)
390 {
391 struct joydev_client *client = file->private_data;
392 struct joydev *joydev = client->joydev;
393 struct input_dev *input = joydev->handle.dev;
394 struct js_event event;
395 int retval;
396
397 if (!joydev->exist)
398 return -ENODEV;
399
400 if (count < sizeof(struct js_event))
401 return -EINVAL;
402
403 if (count == sizeof(struct JS_DATA_TYPE))
404 return joydev_0x_read(client, input, buf);
405
406 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
407 return -EAGAIN;
408
409 retval = wait_event_interruptible(joydev->wait,
410 !joydev->exist || joydev_data_pending(client));
411 if (retval)
412 return retval;
413
414 if (!joydev->exist)
415 return -ENODEV;
416
417 while (retval + sizeof(struct js_event) <= count &&
418 joydev_generate_startup_event(client, input, &event)) {
419
420 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
421 return -EFAULT;
422
423 retval += sizeof(struct js_event);
424 }
425
426 while (retval + sizeof(struct js_event) <= count &&
427 joydev_fetch_next_event(client, &event)) {
428
429 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
430 return -EFAULT;
431
432 retval += sizeof(struct js_event);
433 }
434
435 return retval;
436 }
437
438 /* No kernel lock - fine */
439 static unsigned int joydev_poll(struct file *file, poll_table *wait)
440 {
441 struct joydev_client *client = file->private_data;
442 struct joydev *joydev = client->joydev;
443
444 poll_wait(file, &joydev->wait, wait);
445 return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
446 (joydev->exist ? 0 : (POLLHUP | POLLERR));
447 }
448
449 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
450 void __user *argp, size_t len)
451 {
452 __u8 *abspam;
453 int i;
454 int retval = 0;
455
456 len = min(len, sizeof(joydev->abspam));
457
458 /* Validate the map. */
459 abspam = memdup_user(argp, len);
460 if (IS_ERR(abspam))
461 return PTR_ERR(abspam);
462
463 for (i = 0; i < joydev->nabs; i++) {
464 if (abspam[i] > ABS_MAX) {
465 retval = -EINVAL;
466 goto out;
467 }
468 }
469
470 memcpy(joydev->abspam, abspam, len);
471
472 for (i = 0; i < joydev->nabs; i++)
473 joydev->absmap[joydev->abspam[i]] = i;
474
475 out:
476 kfree(abspam);
477 return retval;
478 }
479
480 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
481 void __user *argp, size_t len)
482 {
483 __u16 *keypam;
484 int i;
485 int retval = 0;
486
487 len = min(len, sizeof(joydev->keypam));
488
489 /* Validate the map. */
490 keypam = memdup_user(argp, len);
491 if (IS_ERR(keypam))
492 return PTR_ERR(keypam);
493
494 for (i = 0; i < joydev->nkey; i++) {
495 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
496 retval = -EINVAL;
497 goto out;
498 }
499 }
500
501 memcpy(joydev->keypam, keypam, len);
502
503 for (i = 0; i < joydev->nkey; i++)
504 joydev->keymap[keypam[i] - BTN_MISC] = i;
505
506 out:
507 kfree(keypam);
508 return retval;
509 }
510
511
512 static int joydev_ioctl_common(struct joydev *joydev,
513 unsigned int cmd, void __user *argp)
514 {
515 struct input_dev *dev = joydev->handle.dev;
516 size_t len;
517 int i;
518 const char *name;
519
520 /* Process fixed-sized commands. */
521 switch (cmd) {
522
523 case JS_SET_CAL:
524 return copy_from_user(&joydev->glue.JS_CORR, argp,
525 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
526
527 case JS_GET_CAL:
528 return copy_to_user(argp, &joydev->glue.JS_CORR,
529 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
530
531 case JS_SET_TIMEOUT:
532 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
533
534 case JS_GET_TIMEOUT:
535 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
536
537 case JSIOCGVERSION:
538 return put_user(JS_VERSION, (__u32 __user *) argp);
539
540 case JSIOCGAXES:
541 return put_user(joydev->nabs, (__u8 __user *) argp);
542
543 case JSIOCGBUTTONS:
544 return put_user(joydev->nkey, (__u8 __user *) argp);
545
546 case JSIOCSCORR:
547 if (copy_from_user(joydev->corr, argp,
548 sizeof(joydev->corr[0]) * joydev->nabs))
549 return -EFAULT;
550
551 for (i = 0; i < joydev->nabs; i++) {
552 int val = input_abs_get_val(dev, joydev->abspam[i]);
553 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
554 }
555 return 0;
556
557 case JSIOCGCORR:
558 return copy_to_user(argp, joydev->corr,
559 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
560
561 }
562
563 /*
564 * Process variable-sized commands (the axis and button map commands
565 * are considered variable-sized to decouple them from the values of
566 * ABS_MAX and KEY_MAX).
567 */
568 switch (cmd & ~IOCSIZE_MASK) {
569
570 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
571 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
572
573 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
574 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
575 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
576
577 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
578 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
579
580 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
581 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
582 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
583
584 case JSIOCGNAME(0):
585 name = dev->name;
586 if (!name)
587 return 0;
588
589 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
590 return copy_to_user(argp, name, len) ? -EFAULT : len;
591 }
592
593 return -EINVAL;
594 }
595
596 #ifdef CONFIG_COMPAT
597 static long joydev_compat_ioctl(struct file *file,
598 unsigned int cmd, unsigned long arg)
599 {
600 struct joydev_client *client = file->private_data;
601 struct joydev *joydev = client->joydev;
602 void __user *argp = (void __user *)arg;
603 s32 tmp32;
604 struct JS_DATA_SAVE_TYPE_32 ds32;
605 int retval;
606
607 retval = mutex_lock_interruptible(&joydev->mutex);
608 if (retval)
609 return retval;
610
611 if (!joydev->exist) {
612 retval = -ENODEV;
613 goto out;
614 }
615
616 switch (cmd) {
617
618 case JS_SET_TIMELIMIT:
619 retval = get_user(tmp32, (s32 __user *) arg);
620 if (retval == 0)
621 joydev->glue.JS_TIMELIMIT = tmp32;
622 break;
623
624 case JS_GET_TIMELIMIT:
625 tmp32 = joydev->glue.JS_TIMELIMIT;
626 retval = put_user(tmp32, (s32 __user *) arg);
627 break;
628
629 case JS_SET_ALL:
630 retval = copy_from_user(&ds32, argp,
631 sizeof(ds32)) ? -EFAULT : 0;
632 if (retval == 0) {
633 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
634 joydev->glue.BUSY = ds32.BUSY;
635 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
636 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
637 joydev->glue.JS_SAVE = ds32.JS_SAVE;
638 joydev->glue.JS_CORR = ds32.JS_CORR;
639 }
640 break;
641
642 case JS_GET_ALL:
643 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
644 ds32.BUSY = joydev->glue.BUSY;
645 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
646 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
647 ds32.JS_SAVE = joydev->glue.JS_SAVE;
648 ds32.JS_CORR = joydev->glue.JS_CORR;
649
650 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
651 break;
652
653 default:
654 retval = joydev_ioctl_common(joydev, cmd, argp);
655 break;
656 }
657
658 out:
659 mutex_unlock(&joydev->mutex);
660 return retval;
661 }
662 #endif /* CONFIG_COMPAT */
663
664 static long joydev_ioctl(struct file *file,
665 unsigned int cmd, unsigned long arg)
666 {
667 struct joydev_client *client = file->private_data;
668 struct joydev *joydev = client->joydev;
669 void __user *argp = (void __user *)arg;
670 int retval;
671
672 retval = mutex_lock_interruptible(&joydev->mutex);
673 if (retval)
674 return retval;
675
676 if (!joydev->exist) {
677 retval = -ENODEV;
678 goto out;
679 }
680
681 switch (cmd) {
682
683 case JS_SET_TIMELIMIT:
684 retval = get_user(joydev->glue.JS_TIMELIMIT,
685 (long __user *) arg);
686 break;
687
688 case JS_GET_TIMELIMIT:
689 retval = put_user(joydev->glue.JS_TIMELIMIT,
690 (long __user *) arg);
691 break;
692
693 case JS_SET_ALL:
694 retval = copy_from_user(&joydev->glue, argp,
695 sizeof(joydev->glue)) ? -EFAULT : 0;
696 break;
697
698 case JS_GET_ALL:
699 retval = copy_to_user(argp, &joydev->glue,
700 sizeof(joydev->glue)) ? -EFAULT : 0;
701 break;
702
703 default:
704 retval = joydev_ioctl_common(joydev, cmd, argp);
705 break;
706 }
707 out:
708 mutex_unlock(&joydev->mutex);
709 return retval;
710 }
711
712 static const struct file_operations joydev_fops = {
713 .owner = THIS_MODULE,
714 .read = joydev_read,
715 .poll = joydev_poll,
716 .open = joydev_open,
717 .release = joydev_release,
718 .unlocked_ioctl = joydev_ioctl,
719 #ifdef CONFIG_COMPAT
720 .compat_ioctl = joydev_compat_ioctl,
721 #endif
722 .fasync = joydev_fasync,
723 .llseek = no_llseek,
724 };
725
726 /*
727 * Mark device non-existent. This disables writes, ioctls and
728 * prevents new users from opening the device. Already posted
729 * blocking reads will stay, however new ones will fail.
730 */
731 static void joydev_mark_dead(struct joydev *joydev)
732 {
733 mutex_lock(&joydev->mutex);
734 joydev->exist = false;
735 mutex_unlock(&joydev->mutex);
736 }
737
738 static void joydev_cleanup(struct joydev *joydev)
739 {
740 struct input_handle *handle = &joydev->handle;
741
742 joydev_mark_dead(joydev);
743 joydev_hangup(joydev);
744
745 /* joydev is marked dead so no one else accesses joydev->open */
746 if (joydev->open)
747 input_close_device(handle);
748 }
749
750 static bool joydev_dev_is_absolute_mouse(struct input_dev *dev)
751 {
752 DECLARE_BITMAP(jd_scratch, KEY_CNT);
753
754 BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT);
755
756 /*
757 * Virtualization (VMware, etc) and remote management (HP
758 * ILO2) solutions use absolute coordinates for their virtual
759 * pointing devices so that there is one-to-one relationship
760 * between pointer position on the host screen and virtual
761 * guest screen, and so their mice use ABS_X, ABS_Y and 3
762 * primary button events. This clashes with what joydev
763 * considers to be joysticks (a device with at minimum ABS_X
764 * axis).
765 *
766 * Here we are trying to separate absolute mice from
767 * joysticks. A device is, for joystick detection purposes,
768 * considered to be an absolute mouse if the following is
769 * true:
770 *
771 * 1) Event types are exactly EV_ABS, EV_KEY and EV_SYN.
772 * 2) Absolute events are exactly ABS_X and ABS_Y.
773 * 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE.
774 * 4) Device is not on "Amiga" bus.
775 */
776
777 bitmap_zero(jd_scratch, EV_CNT);
778 __set_bit(EV_ABS, jd_scratch);
779 __set_bit(EV_KEY, jd_scratch);
780 __set_bit(EV_SYN, jd_scratch);
781 if (!bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
782 return false;
783
784 bitmap_zero(jd_scratch, ABS_CNT);
785 __set_bit(ABS_X, jd_scratch);
786 __set_bit(ABS_Y, jd_scratch);
787 if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT))
788 return false;
789
790 bitmap_zero(jd_scratch, KEY_CNT);
791 __set_bit(BTN_LEFT, jd_scratch);
792 __set_bit(BTN_RIGHT, jd_scratch);
793 __set_bit(BTN_MIDDLE, jd_scratch);
794
795 if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT))
796 return false;
797
798 /*
799 * Amiga joystick (amijoy) historically uses left/middle/right
800 * button events.
801 */
802 if (dev->id.bustype == BUS_AMIGA)
803 return false;
804
805 return true;
806 }
807
808 static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
809 {
810 /* Avoid touchpads and touchscreens */
811 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
812 return false;
813
814 /* Avoid tablets, digitisers and similar devices */
815 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit))
816 return false;
817
818 /* Avoid absolute mice */
819 if (joydev_dev_is_absolute_mouse(dev))
820 return false;
821
822 return true;
823 }
824
825 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
826 const struct input_device_id *id)
827 {
828 struct joydev *joydev;
829 int i, j, t, minor, dev_no;
830 int error;
831
832 minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true);
833 if (minor < 0) {
834 error = minor;
835 pr_err("failed to reserve new minor: %d\n", error);
836 return error;
837 }
838
839 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
840 if (!joydev) {
841 error = -ENOMEM;
842 goto err_free_minor;
843 }
844
845 INIT_LIST_HEAD(&joydev->client_list);
846 spin_lock_init(&joydev->client_lock);
847 mutex_init(&joydev->mutex);
848 init_waitqueue_head(&joydev->wait);
849 joydev->exist = true;
850
851 dev_no = minor;
852 /* Normalize device number if it falls into legacy range */
853 if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS)
854 dev_no -= JOYDEV_MINOR_BASE;
855 dev_set_name(&joydev->dev, "js%d", dev_no);
856
857 joydev->handle.dev = input_get_device(dev);
858 joydev->handle.name = dev_name(&joydev->dev);
859 joydev->handle.handler = handler;
860 joydev->handle.private = joydev;
861
862 for_each_set_bit(i, dev->absbit, ABS_CNT) {
863 joydev->absmap[i] = joydev->nabs;
864 joydev->abspam[joydev->nabs] = i;
865 joydev->nabs++;
866 }
867
868 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
869 if (test_bit(i + BTN_MISC, dev->keybit)) {
870 joydev->keymap[i] = joydev->nkey;
871 joydev->keypam[joydev->nkey] = i + BTN_MISC;
872 joydev->nkey++;
873 }
874
875 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
876 if (test_bit(i + BTN_MISC, dev->keybit)) {
877 joydev->keymap[i] = joydev->nkey;
878 joydev->keypam[joydev->nkey] = i + BTN_MISC;
879 joydev->nkey++;
880 }
881
882 for (i = 0; i < joydev->nabs; i++) {
883 j = joydev->abspam[i];
884 if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
885 joydev->corr[i].type = JS_CORR_NONE;
886 continue;
887 }
888 joydev->corr[i].type = JS_CORR_BROKEN;
889 joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
890
891 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
892 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
893 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
894
895 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
896 - 2 * input_abs_get_flat(dev, j);
897 if (t) {
898 joydev->corr[i].coef[2] = (1 << 29) / t;
899 joydev->corr[i].coef[3] = (1 << 29) / t;
900 }
901 }
902
903 joydev->dev.devt = MKDEV(INPUT_MAJOR, minor);
904 joydev->dev.class = &input_class;
905 joydev->dev.parent = &dev->dev;
906 joydev->dev.release = joydev_free;
907 device_initialize(&joydev->dev);
908
909 error = input_register_handle(&joydev->handle);
910 if (error)
911 goto err_free_joydev;
912
913 cdev_init(&joydev->cdev, &joydev_fops);
914
915 error = cdev_device_add(&joydev->cdev, &joydev->dev);
916 if (error)
917 goto err_cleanup_joydev;
918
919 return 0;
920
921 err_cleanup_joydev:
922 joydev_cleanup(joydev);
923 input_unregister_handle(&joydev->handle);
924 err_free_joydev:
925 put_device(&joydev->dev);
926 err_free_minor:
927 input_free_minor(minor);
928 return error;
929 }
930
931 static void joydev_disconnect(struct input_handle *handle)
932 {
933 struct joydev *joydev = handle->private;
934
935 cdev_device_del(&joydev->cdev, &joydev->dev);
936 joydev_cleanup(joydev);
937 input_free_minor(MINOR(joydev->dev.devt));
938 input_unregister_handle(handle);
939 put_device(&joydev->dev);
940 }
941
942 static const struct input_device_id joydev_ids[] = {
943 {
944 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
945 INPUT_DEVICE_ID_MATCH_ABSBIT,
946 .evbit = { BIT_MASK(EV_ABS) },
947 .absbit = { BIT_MASK(ABS_X) },
948 },
949 {
950 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
951 INPUT_DEVICE_ID_MATCH_ABSBIT,
952 .evbit = { BIT_MASK(EV_ABS) },
953 .absbit = { BIT_MASK(ABS_Z) },
954 },
955 {
956 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
957 INPUT_DEVICE_ID_MATCH_ABSBIT,
958 .evbit = { BIT_MASK(EV_ABS) },
959 .absbit = { BIT_MASK(ABS_WHEEL) },
960 },
961 {
962 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
963 INPUT_DEVICE_ID_MATCH_ABSBIT,
964 .evbit = { BIT_MASK(EV_ABS) },
965 .absbit = { BIT_MASK(ABS_THROTTLE) },
966 },
967 {
968 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
969 INPUT_DEVICE_ID_MATCH_KEYBIT,
970 .evbit = { BIT_MASK(EV_KEY) },
971 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
972 },
973 {
974 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
975 INPUT_DEVICE_ID_MATCH_KEYBIT,
976 .evbit = { BIT_MASK(EV_KEY) },
977 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
978 },
979 {
980 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
981 INPUT_DEVICE_ID_MATCH_KEYBIT,
982 .evbit = { BIT_MASK(EV_KEY) },
983 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
984 },
985 { } /* Terminating entry */
986 };
987
988 MODULE_DEVICE_TABLE(input, joydev_ids);
989
990 static struct input_handler joydev_handler = {
991 .event = joydev_event,
992 .match = joydev_match,
993 .connect = joydev_connect,
994 .disconnect = joydev_disconnect,
995 .legacy_minors = true,
996 .minor = JOYDEV_MINOR_BASE,
997 .name = "joydev",
998 .id_table = joydev_ids,
999 };
1000
1001 static int __init joydev_init(void)
1002 {
1003 return input_register_handler(&joydev_handler);
1004 }
1005
1006 static void __exit joydev_exit(void)
1007 {
1008 input_unregister_handler(&joydev_handler);
1009 }
1010
1011 module_init(joydev_init);
1012 module_exit(joydev_exit);
Linux with added FPC-III support