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