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