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Merge tag 'v4.2-rc3' into next
[deliverable/linux.git] / drivers / input / joydev.c
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/miscdevice.h>
26 #include <linux/module.h>
27 #include <linux/poll.h>
28 #include <linux/init.h>
29 #include <linux/device.h>
30 #include <linux/cdev.h>
31
32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
33 MODULE_DESCRIPTION("Joystick device interfaces");
34 MODULE_SUPPORTED_DEVICE("input/js");
35 MODULE_LICENSE("GPL");
36
37 #define JOYDEV_MINOR_BASE 0
38 #define JOYDEV_MINORS 16
39 #define JOYDEV_BUFFER_SIZE 64
40
41 struct joydev {
42 int open;
43 struct input_handle handle;
44 wait_queue_head_t wait;
45 struct list_head client_list;
46 spinlock_t client_lock; /* protects client_list */
47 struct mutex mutex;
48 struct device dev;
49 struct cdev cdev;
50 bool exist;
51
52 struct js_corr corr[ABS_CNT];
53 struct JS_DATA_SAVE_TYPE glue;
54 int nabs;
55 int nkey;
56 __u16 keymap[KEY_MAX - BTN_MISC + 1];
57 __u16 keypam[KEY_MAX - BTN_MISC + 1];
58 __u8 absmap[ABS_CNT];
59 __u8 abspam[ABS_CNT];
60 __s16 abs[ABS_CNT];
61 };
62
63 struct joydev_client {
64 struct js_event buffer[JOYDEV_BUFFER_SIZE];
65 int head;
66 int tail;
67 int startup;
68 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
69 struct fasync_struct *fasync;
70 struct joydev *joydev;
71 struct list_head node;
72 };
73
74 static int joydev_correct(int value, struct js_corr *corr)
75 {
76 switch (corr->type) {
77
78 case JS_CORR_NONE:
79 break;
80
81 case JS_CORR_BROKEN:
82 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
83 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
84 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
85 break;
86
87 default:
88 return 0;
89 }
90
91 return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
92 }
93
94 static void joydev_pass_event(struct joydev_client *client,
95 struct js_event *event)
96 {
97 struct joydev *joydev = client->joydev;
98
99 /*
100 * IRQs already disabled, just acquire the lock
101 */
102 spin_lock(&client->buffer_lock);
103
104 client->buffer[client->head] = *event;
105
106 if (client->startup == joydev->nabs + joydev->nkey) {
107 client->head++;
108 client->head &= JOYDEV_BUFFER_SIZE - 1;
109 if (client->tail == client->head)
110 client->startup = 0;
111 }
112
113 spin_unlock(&client->buffer_lock);
114
115 kill_fasync(&client->fasync, SIGIO, POLL_IN);
116 }
117
118 static void joydev_event(struct input_handle *handle,
119 unsigned int type, unsigned int code, int value)
120 {
121 struct joydev *joydev = handle->private;
122 struct joydev_client *client;
123 struct js_event event;
124
125 switch (type) {
126
127 case EV_KEY:
128 if (code < BTN_MISC || value == 2)
129 return;
130 event.type = JS_EVENT_BUTTON;
131 event.number = joydev->keymap[code - BTN_MISC];
132 event.value = value;
133 break;
134
135 case EV_ABS:
136 event.type = JS_EVENT_AXIS;
137 event.number = joydev->absmap[code];
138 event.value = joydev_correct(value,
139 &joydev->corr[event.number]);
140 if (event.value == joydev->abs[event.number])
141 return;
142 joydev->abs[event.number] = event.value;
143 break;
144
145 default:
146 return;
147 }
148
149 event.time = jiffies_to_msecs(jiffies);
150
151 rcu_read_lock();
152 list_for_each_entry_rcu(client, &joydev->client_list, node)
153 joydev_pass_event(client, &event);
154 rcu_read_unlock();
155
156 wake_up_interruptible(&joydev->wait);
157 }
158
159 static int joydev_fasync(int fd, struct file *file, int on)
160 {
161 struct joydev_client *client = file->private_data;
162
163 return fasync_helper(fd, file, on, &client->fasync);
164 }
165
166 static void joydev_free(struct device *dev)
167 {
168 struct joydev *joydev = container_of(dev, struct joydev, dev);
169
170 input_put_device(joydev->handle.dev);
171 kfree(joydev);
172 }
173
174 static void joydev_attach_client(struct joydev *joydev,
175 struct joydev_client *client)
176 {
177 spin_lock(&joydev->client_lock);
178 list_add_tail_rcu(&client->node, &joydev->client_list);
179 spin_unlock(&joydev->client_lock);
180 }
181
182 static void joydev_detach_client(struct joydev *joydev,
183 struct joydev_client *client)
184 {
185 spin_lock(&joydev->client_lock);
186 list_del_rcu(&client->node);
187 spin_unlock(&joydev->client_lock);
188 synchronize_rcu();
189 }
190
191 static int joydev_open_device(struct joydev *joydev)
192 {
193 int retval;
194
195 retval = mutex_lock_interruptible(&joydev->mutex);
196 if (retval)
197 return retval;
198
199 if (!joydev->exist)
200 retval = -ENODEV;
201 else if (!joydev->open++) {
202 retval = input_open_device(&joydev->handle);
203 if (retval)
204 joydev->open--;
205 }
206
207 mutex_unlock(&joydev->mutex);
208 return retval;
209 }
210
211 static void joydev_close_device(struct joydev *joydev)
212 {
213 mutex_lock(&joydev->mutex);
214
215 if (joydev->exist && !--joydev->open)
216 input_close_device(&joydev->handle);
217
218 mutex_unlock(&joydev->mutex);
219 }
220
221 /*
222 * Wake up users waiting for IO so they can disconnect from
223 * dead device.
224 */
225 static void joydev_hangup(struct joydev *joydev)
226 {
227 struct joydev_client *client;
228
229 spin_lock(&joydev->client_lock);
230 list_for_each_entry(client, &joydev->client_list, node)
231 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
232 spin_unlock(&joydev->client_lock);
233
234 wake_up_interruptible(&joydev->wait);
235 }
236
237 static int joydev_release(struct inode *inode, struct file *file)
238 {
239 struct joydev_client *client = file->private_data;
240 struct joydev *joydev = client->joydev;
241
242 joydev_detach_client(joydev, client);
243 kfree(client);
244
245 joydev_close_device(joydev);
246
247 return 0;
248 }
249
250 static int joydev_open(struct inode *inode, struct file *file)
251 {
252 struct joydev *joydev =
253 container_of(inode->i_cdev, struct joydev, cdev);
254 struct joydev_client *client;
255 int error;
256
257 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
258 if (!client)
259 return -ENOMEM;
260
261 spin_lock_init(&client->buffer_lock);
262 client->joydev = joydev;
263 joydev_attach_client(joydev, client);
264
265 error = joydev_open_device(joydev);
266 if (error)
267 goto err_free_client;
268
269 file->private_data = client;
270 nonseekable_open(inode, file);
271
272 return 0;
273
274 err_free_client:
275 joydev_detach_client(joydev, client);
276 kfree(client);
277 return error;
278 }
279
280 static int joydev_generate_startup_event(struct joydev_client *client,
281 struct input_dev *input,
282 struct js_event *event)
283 {
284 struct joydev *joydev = client->joydev;
285 int have_event;
286
287 spin_lock_irq(&client->buffer_lock);
288
289 have_event = client->startup < joydev->nabs + joydev->nkey;
290
291 if (have_event) {
292
293 event->time = jiffies_to_msecs(jiffies);
294 if (client->startup < joydev->nkey) {
295 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
296 event->number = client->startup;
297 event->value = !!test_bit(joydev->keypam[event->number],
298 input->key);
299 } else {
300 event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
301 event->number = client->startup - joydev->nkey;
302 event->value = joydev->abs[event->number];
303 }
304 client->startup++;
305 }
306
307 spin_unlock_irq(&client->buffer_lock);
308
309 return have_event;
310 }
311
312 static int joydev_fetch_next_event(struct joydev_client *client,
313 struct js_event *event)
314 {
315 int have_event;
316
317 spin_lock_irq(&client->buffer_lock);
318
319 have_event = client->head != client->tail;
320 if (have_event) {
321 *event = client->buffer[client->tail++];
322 client->tail &= JOYDEV_BUFFER_SIZE - 1;
323 }
324
325 spin_unlock_irq(&client->buffer_lock);
326
327 return have_event;
328 }
329
330 /*
331 * Old joystick interface
332 */
333 static ssize_t joydev_0x_read(struct joydev_client *client,
334 struct input_dev *input,
335 char __user *buf)
336 {
337 struct joydev *joydev = client->joydev;
338 struct JS_DATA_TYPE data;
339 int i;
340
341 spin_lock_irq(&input->event_lock);
342
343 /*
344 * Get device state
345 */
346 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
347 data.buttons |=
348 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
349 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
350 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
351
352 /*
353 * Reset reader's event queue
354 */
355 spin_lock(&client->buffer_lock);
356 client->startup = 0;
357 client->tail = client->head;
358 spin_unlock(&client->buffer_lock);
359
360 spin_unlock_irq(&input->event_lock);
361
362 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
363 return -EFAULT;
364
365 return sizeof(struct JS_DATA_TYPE);
366 }
367
368 static inline int joydev_data_pending(struct joydev_client *client)
369 {
370 struct joydev *joydev = client->joydev;
371
372 return client->startup < joydev->nabs + joydev->nkey ||
373 client->head != client->tail;
374 }
375
376 static ssize_t joydev_read(struct file *file, char __user *buf,
377 size_t count, loff_t *ppos)
378 {
379 struct joydev_client *client = file->private_data;
380 struct joydev *joydev = client->joydev;
381 struct input_dev *input = joydev->handle.dev;
382 struct js_event event;
383 int retval;
384
385 if (!joydev->exist)
386 return -ENODEV;
387
388 if (count < sizeof(struct js_event))
389 return -EINVAL;
390
391 if (count == sizeof(struct JS_DATA_TYPE))
392 return joydev_0x_read(client, input, buf);
393
394 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
395 return -EAGAIN;
396
397 retval = wait_event_interruptible(joydev->wait,
398 !joydev->exist || joydev_data_pending(client));
399 if (retval)
400 return retval;
401
402 if (!joydev->exist)
403 return -ENODEV;
404
405 while (retval + sizeof(struct js_event) <= count &&
406 joydev_generate_startup_event(client, input, &event)) {
407
408 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
409 return -EFAULT;
410
411 retval += sizeof(struct js_event);
412 }
413
414 while (retval + sizeof(struct js_event) <= count &&
415 joydev_fetch_next_event(client, &event)) {
416
417 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
418 return -EFAULT;
419
420 retval += sizeof(struct js_event);
421 }
422
423 return retval;
424 }
425
426 /* No kernel lock - fine */
427 static unsigned int joydev_poll(struct file *file, poll_table *wait)
428 {
429 struct joydev_client *client = file->private_data;
430 struct joydev *joydev = client->joydev;
431
432 poll_wait(file, &joydev->wait, wait);
433 return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
434 (joydev->exist ? 0 : (POLLHUP | POLLERR));
435 }
436
437 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
438 void __user *argp, size_t len)
439 {
440 __u8 *abspam;
441 int i;
442 int retval = 0;
443
444 len = min(len, sizeof(joydev->abspam));
445
446 /* Validate the map. */
447 abspam = kmalloc(len, GFP_KERNEL);
448 if (!abspam)
449 return -ENOMEM;
450
451 if (copy_from_user(abspam, argp, len)) {
452 retval = -EFAULT;
453 goto out;
454 }
455
456 for (i = 0; i < joydev->nabs; i++) {
457 if (abspam[i] > ABS_MAX) {
458 retval = -EINVAL;
459 goto out;
460 }
461 }
462
463 memcpy(joydev->abspam, abspam, len);
464
465 for (i = 0; i < joydev->nabs; i++)
466 joydev->absmap[joydev->abspam[i]] = i;
467
468 out:
469 kfree(abspam);
470 return retval;
471 }
472
473 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
474 void __user *argp, size_t len)
475 {
476 __u16 *keypam;
477 int i;
478 int retval = 0;
479
480 len = min(len, sizeof(joydev->keypam));
481
482 /* Validate the map. */
483 keypam = kmalloc(len, GFP_KERNEL);
484 if (!keypam)
485 return -ENOMEM;
486
487 if (copy_from_user(keypam, argp, len)) {
488 retval = -EFAULT;
489 goto out;
490 }
491
492 for (i = 0; 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[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 cdev_del(&joydev->cdev);
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 joydev->abs[i] = input_abs_get_val(dev, j);
887 continue;
888 }
889 joydev->corr[i].type = JS_CORR_BROKEN;
890 joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
891
892 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
893 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
894 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
895
896 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
897 - 2 * input_abs_get_flat(dev, j);
898 if (t) {
899 joydev->corr[i].coef[2] = (1 << 29) / t;
900 joydev->corr[i].coef[3] = (1 << 29) / t;
901
902 joydev->abs[i] =
903 joydev_correct(input_abs_get_val(dev, j),
904 joydev->corr + i);
905 }
906 }
907
908 joydev->dev.devt = MKDEV(INPUT_MAJOR, minor);
909 joydev->dev.class = &input_class;
910 joydev->dev.parent = &dev->dev;
911 joydev->dev.release = joydev_free;
912 device_initialize(&joydev->dev);
913
914 error = input_register_handle(&joydev->handle);
915 if (error)
916 goto err_free_joydev;
917
918 cdev_init(&joydev->cdev, &joydev_fops);
919 joydev->cdev.kobj.parent = &joydev->dev.kobj;
920 error = cdev_add(&joydev->cdev, joydev->dev.devt, 1);
921 if (error)
922 goto err_unregister_handle;
923
924 error = device_add(&joydev->dev);
925 if (error)
926 goto err_cleanup_joydev;
927
928 return 0;
929
930 err_cleanup_joydev:
931 joydev_cleanup(joydev);
932 err_unregister_handle:
933 input_unregister_handle(&joydev->handle);
934 err_free_joydev:
935 put_device(&joydev->dev);
936 err_free_minor:
937 input_free_minor(minor);
938 return error;
939 }
940
941 static void joydev_disconnect(struct input_handle *handle)
942 {
943 struct joydev *joydev = handle->private;
944
945 device_del(&joydev->dev);
946 joydev_cleanup(joydev);
947 input_free_minor(MINOR(joydev->dev.devt));
948 input_unregister_handle(handle);
949 put_device(&joydev->dev);
950 }
951
952 static const struct input_device_id joydev_ids[] = {
953 {
954 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
955 INPUT_DEVICE_ID_MATCH_ABSBIT,
956 .evbit = { BIT_MASK(EV_ABS) },
957 .absbit = { BIT_MASK(ABS_X) },
958 },
959 {
960 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
961 INPUT_DEVICE_ID_MATCH_ABSBIT,
962 .evbit = { BIT_MASK(EV_ABS) },
963 .absbit = { BIT_MASK(ABS_WHEEL) },
964 },
965 {
966 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
967 INPUT_DEVICE_ID_MATCH_ABSBIT,
968 .evbit = { BIT_MASK(EV_ABS) },
969 .absbit = { BIT_MASK(ABS_THROTTLE) },
970 },
971 {
972 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
973 INPUT_DEVICE_ID_MATCH_KEYBIT,
974 .evbit = { BIT_MASK(EV_KEY) },
975 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
976 },
977 {
978 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
979 INPUT_DEVICE_ID_MATCH_KEYBIT,
980 .evbit = { BIT_MASK(EV_KEY) },
981 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
982 },
983 {
984 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
985 INPUT_DEVICE_ID_MATCH_KEYBIT,
986 .evbit = { BIT_MASK(EV_KEY) },
987 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
988 },
989 { } /* Terminating entry */
990 };
991
992 MODULE_DEVICE_TABLE(input, joydev_ids);
993
994 static struct input_handler joydev_handler = {
995 .event = joydev_event,
996 .match = joydev_match,
997 .connect = joydev_connect,
998 .disconnect = joydev_disconnect,
999 .legacy_minors = true,
1000 .minor = JOYDEV_MINOR_BASE,
1001 .name = "joydev",
1002 .id_table = joydev_ids,
1003 };
1004
1005 static int __init joydev_init(void)
1006 {
1007 return input_register_handler(&joydev_handler);
1008 }
1009
1010 static void __exit joydev_exit(void)
1011 {
1012 input_unregister_handler(&joydev_handler);
1013 }
1014
1015 module_init(joydev_init);
1016 module_exit(joydev_exit);
Linux kernel - Deliverables
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