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