?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 2.6.34-rc3
[pohmelfs.git] / drivers / input / joydev.c
blobc52bec4d0530f632667031e023e980e78dc4fcaf
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 #include <asm/io.h>
14 #include <asm/system.h>
15 #include <linux/delay.h>
16 #include <linux/errno.h>
17 #include <linux/joystick.h>
18 #include <linux/input.h>
19 #include <linux/kernel.h>
20 #include <linux/major.h>
21 #include <linux/sched.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/miscdevice.h>
25 #include <linux/module.h>
26 #include <linux/poll.h>
27 #include <linux/init.h>
28 #include <linux/device.h>
29
30 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
31 MODULE_DESCRIPTION("Joystick device interfaces");
32 MODULE_SUPPORTED_DEVICE("input/js");
33 MODULE_LICENSE("GPL");
34
35 #define JOYDEV_MINOR_BASE 0
36 #define JOYDEV_MINORS 16
37 #define JOYDEV_BUFFER_SIZE 64
38
39 struct joydev {
40 int exist;
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
50 struct js_corr corr[ABS_MAX + 1];
51 struct JS_DATA_SAVE_TYPE glue;
52 int nabs;
53 int nkey;
54 __u16 keymap[KEY_MAX - BTN_MISC + 1];
55 __u16 keypam[KEY_MAX - BTN_MISC + 1];
56 __u8 absmap[ABS_MAX + 1];
57 __u8 abspam[ABS_MAX + 1];
58 __s16 abs[ABS_MAX + 1];
59 };
60
61 struct joydev_client {
62 struct js_event buffer[JOYDEV_BUFFER_SIZE];
63 int head;
64 int tail;
65 int startup;
66 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
67 struct fasync_struct *fasync;
68 struct joydev *joydev;
69 struct list_head node;
70 };
71
72 static struct joydev *joydev_table[JOYDEV_MINORS];
73 static DEFINE_MUTEX(joydev_table_mutex);
74
75 static int joydev_correct(int value, struct js_corr *corr)
76 {
77 switch (corr->type) {
78
79 case JS_CORR_NONE:
80 break;
81
82 case JS_CORR_BROKEN:
83 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
84 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
85 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
86 break;
87
88 default:
89 return 0;
90 }
91
92 return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
93 }
94
95 static void joydev_pass_event(struct joydev_client *client,
96 struct js_event *event)
97 {
98 struct joydev *joydev = client->joydev;
99
100 /*
101 * IRQs already disabled, just acquire the lock
102 */
103 spin_lock(&client->buffer_lock);
104
105 client->buffer[client->head] = *event;
106
107 if (client->startup == joydev->nabs + joydev->nkey) {
108 client->head++;
109 client->head &= JOYDEV_BUFFER_SIZE - 1;
110 if (client->tail == client->head)
111 client->startup = 0;
112 }
113
114 spin_unlock(&client->buffer_lock);
115
116 kill_fasync(&client->fasync, SIGIO, POLL_IN);
117 }
118
119 static void joydev_event(struct input_handle *handle,
120 unsigned int type, unsigned int code, int value)
121 {
122 struct joydev *joydev = handle->private;
123 struct joydev_client *client;
124 struct js_event event;
125
126 switch (type) {
127
128 case EV_KEY:
129 if (code < BTN_MISC || value == 2)
130 return;
131 event.type = JS_EVENT_BUTTON;
132 event.number = joydev->keymap[code - BTN_MISC];
133 event.value = value;
134 break;
135
136 case EV_ABS:
137 event.type = JS_EVENT_AXIS;
138 event.number = joydev->absmap[code];
139 event.value = joydev_correct(value,
140 &joydev->corr[event.number]);
141 if (event.value == joydev->abs[event.number])
142 return;
143 joydev->abs[event.number] = event.value;
144 break;
145
146 default:
147 return;
148 }
149
150 event.time = jiffies_to_msecs(jiffies);
151
152 rcu_read_lock();
153 list_for_each_entry_rcu(client, &joydev->client_list, node)
154 joydev_pass_event(client, &event);
155 rcu_read_unlock();
156
157 wake_up_interruptible(&joydev->wait);
158 }
159
160 static int joydev_fasync(int fd, struct file *file, int on)
161 {
162 struct joydev_client *client = file->private_data;
163
164 return fasync_helper(fd, file, on, &client->fasync);
165 }
166
167 static void joydev_free(struct device *dev)
168 {
169 struct joydev *joydev = container_of(dev, struct joydev, dev);
170
171 input_put_device(joydev->handle.dev);
172 kfree(joydev);
173 }
174
175 static void joydev_attach_client(struct joydev *joydev,
176 struct joydev_client *client)
177 {
178 spin_lock(&joydev->client_lock);
179 list_add_tail_rcu(&client->node, &joydev->client_list);
180 spin_unlock(&joydev->client_lock);
181 synchronize_rcu();
182 }
183
184 static 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
193 static 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
213 static 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 */
227 static 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
239 static 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
253 static 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
301 static 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
333 static 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 */
354 static 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
389 static 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
397 static 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 */
448 static 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
458 static 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 out:
487 kfree(abspam);
488 return retval;
489 }
490
491 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
492 void __user *argp, size_t len)
493 {
494 __u16 *keypam;
495 int i;
496 int retval = 0;
497
498 len = min(len, sizeof(joydev->keypam));
499
500 /* Validate the map. */
501 keypam = kmalloc(len, GFP_KERNEL);
502 if (!keypam)
503 return -ENOMEM;
504
505 if (copy_from_user(keypam, argp, len)) {
506 retval = -EFAULT;
507 goto out;
508 }
509
510 for (i = 0; i < joydev->nkey; i++) {
511 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
512 retval = -EINVAL;
513 goto out;
514 }
515 }
516
517 memcpy(joydev->keypam, keypam, len);
518
519 for (i = 0; i < joydev->nkey; i++)
520 joydev->keymap[keypam[i] - BTN_MISC] = i;
521
522 out:
523 kfree(keypam);
524 return retval;
525 }
526
527
528 static int joydev_ioctl_common(struct joydev *joydev,
529 unsigned int cmd, void __user *argp)
530 {
531 struct input_dev *dev = joydev->handle.dev;
532 size_t len;
533 int i, j;
534 const char *name;
535
536 /* Process fixed-sized commands. */
537 switch (cmd) {
538
539 case JS_SET_CAL:
540 return copy_from_user(&joydev->glue.JS_CORR, argp,
541 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
542
543 case JS_GET_CAL:
544 return copy_to_user(argp, &joydev->glue.JS_CORR,
545 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
546
547 case JS_SET_TIMEOUT:
548 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
549
550 case JS_GET_TIMEOUT:
551 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
552
553 case JSIOCGVERSION:
554 return put_user(JS_VERSION, (__u32 __user *) argp);
555
556 case JSIOCGAXES:
557 return put_user(joydev->nabs, (__u8 __user *) argp);
558
559 case JSIOCGBUTTONS:
560 return put_user(joydev->nkey, (__u8 __user *) argp);
561
562 case JSIOCSCORR:
563 if (copy_from_user(joydev->corr, argp,
564 sizeof(joydev->corr[0]) * joydev->nabs))
565 return -EFAULT;
566
567 for (i = 0; i < joydev->nabs; i++) {
568 j = joydev->abspam[i];
569 joydev->abs[i] = joydev_correct(dev->abs[j],
570 &joydev->corr[i]);
571 }
572 return 0;
573
574 case JSIOCGCORR:
575 return copy_to_user(argp, joydev->corr,
576 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
577
578 }
579
580 /*
581 * Process variable-sized commands (the axis and button map commands
582 * are considered variable-sized to decouple them from the values of
583 * ABS_MAX and KEY_MAX).
584 */
585 switch (cmd & ~IOCSIZE_MASK) {
586
587 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
588 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
589
590 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
591 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
592 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
593
594 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
595 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
596
597 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
598 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
599 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
600
601 case JSIOCGNAME(0):
602 name = dev->name;
603 if (!name)
604 return 0;
605
606 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
607 return copy_to_user(argp, name, len) ? -EFAULT : len;
608 }
609
610 return -EINVAL;
611 }
612
613 #ifdef CONFIG_COMPAT
614 static long joydev_compat_ioctl(struct file *file,
615 unsigned int cmd, unsigned long arg)
616 {
617 struct joydev_client *client = file->private_data;
618 struct joydev *joydev = client->joydev;
619 void __user *argp = (void __user *)arg;
620 s32 tmp32;
621 struct JS_DATA_SAVE_TYPE_32 ds32;
622 int retval;
623
624 retval = mutex_lock_interruptible(&joydev->mutex);
625 if (retval)
626 return retval;
627
628 if (!joydev->exist) {
629 retval = -ENODEV;
630 goto out;
631 }
632
633 switch (cmd) {
634
635 case JS_SET_TIMELIMIT:
636 retval = get_user(tmp32, (s32 __user *) arg);
637 if (retval == 0)
638 joydev->glue.JS_TIMELIMIT = tmp32;
639 break;
640
641 case JS_GET_TIMELIMIT:
642 tmp32 = joydev->glue.JS_TIMELIMIT;
643 retval = put_user(tmp32, (s32 __user *) arg);
644 break;
645
646 case JS_SET_ALL:
647 retval = copy_from_user(&ds32, argp,
648 sizeof(ds32)) ? -EFAULT : 0;
649 if (retval == 0) {
650 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
651 joydev->glue.BUSY = ds32.BUSY;
652 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
653 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
654 joydev->glue.JS_SAVE = ds32.JS_SAVE;
655 joydev->glue.JS_CORR = ds32.JS_CORR;
656 }
657 break;
658
659 case JS_GET_ALL:
660 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
661 ds32.BUSY = joydev->glue.BUSY;
662 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
663 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
664 ds32.JS_SAVE = joydev->glue.JS_SAVE;
665 ds32.JS_CORR = joydev->glue.JS_CORR;
666
667 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
668 break;
669
670 default:
671 retval = joydev_ioctl_common(joydev, cmd, argp);
672 break;
673 }
674
675 out:
676 mutex_unlock(&joydev->mutex);
677 return retval;
678 }
679 #endif /* CONFIG_COMPAT */
680
681 static long joydev_ioctl(struct file *file,
682 unsigned int cmd, unsigned long arg)
683 {
684 struct joydev_client *client = file->private_data;
685 struct joydev *joydev = client->joydev;
686 void __user *argp = (void __user *)arg;
687 int retval;
688
689 retval = mutex_lock_interruptible(&joydev->mutex);
690 if (retval)
691 return retval;
692
693 if (!joydev->exist) {
694 retval = -ENODEV;
695 goto out;
696 }
697
698 switch (cmd) {
699
700 case JS_SET_TIMELIMIT:
701 retval = get_user(joydev->glue.JS_TIMELIMIT,
702 (long __user *) arg);
703 break;
704
705 case JS_GET_TIMELIMIT:
706 retval = put_user(joydev->glue.JS_TIMELIMIT,
707 (long __user *) arg);
708 break;
709
710 case JS_SET_ALL:
711 retval = copy_from_user(&joydev->glue, argp,
712 sizeof(joydev->glue)) ? -EFAULT: 0;
713 break;
714
715 case JS_GET_ALL:
716 retval = copy_to_user(argp, &joydev->glue,
717 sizeof(joydev->glue)) ? -EFAULT : 0;
718 break;
719
720 default:
721 retval = joydev_ioctl_common(joydev, cmd, argp);
722 break;
723 }
724 out:
725 mutex_unlock(&joydev->mutex);
726 return retval;
727 }
728
729 static const struct file_operations joydev_fops = {
730 .owner = THIS_MODULE,
731 .read = joydev_read,
732 .poll = joydev_poll,
733 .open = joydev_open,
734 .release = joydev_release,
735 .unlocked_ioctl = joydev_ioctl,
736 #ifdef CONFIG_COMPAT
737 .compat_ioctl = joydev_compat_ioctl,
738 #endif
739 .fasync = joydev_fasync,
740 };
741
742 static int joydev_install_chrdev(struct joydev *joydev)
743 {
744 joydev_table[joydev->minor] = joydev;
745 return 0;
746 }
747
748 static void joydev_remove_chrdev(struct joydev *joydev)
749 {
750 mutex_lock(&joydev_table_mutex);
751 joydev_table[joydev->minor] = NULL;
752 mutex_unlock(&joydev_table_mutex);
753 }
754
755 /*
756 * Mark device non-existant. This disables writes, ioctls and
757 * prevents new users from opening the device. Already posted
758 * blocking reads will stay, however new ones will fail.
759 */
760 static void joydev_mark_dead(struct joydev *joydev)
761 {
762 mutex_lock(&joydev->mutex);
763 joydev->exist = 0;
764 mutex_unlock(&joydev->mutex);
765 }
766
767 static void joydev_cleanup(struct joydev *joydev)
768 {
769 struct input_handle *handle = &joydev->handle;
770
771 joydev_mark_dead(joydev);
772 joydev_hangup(joydev);
773 joydev_remove_chrdev(joydev);
774
775 /* joydev is marked dead so noone else accesses joydev->open */
776 if (joydev->open)
777 input_close_device(handle);
778 }
779
780
781 static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
782 {
783 /* Avoid touchpads and touchscreens */
784 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
785 return false;
786
787 /* Avoid tablets, digitisers and similar devices */
788 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit))
789 return false;
790
791 return true;
792 }
793
794 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
795 const struct input_device_id *id)
796 {
797 struct joydev *joydev;
798 int i, j, t, minor;
799 int error;
800
801 for (minor = 0; minor < JOYDEV_MINORS; minor++)
802 if (!joydev_table[minor])
803 break;
804
805 if (minor == JOYDEV_MINORS) {
806 printk(KERN_ERR "joydev: no more free joydev devices\n");
807 return -ENFILE;
808 }
809
810 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
811 if (!joydev)
812 return -ENOMEM;
813
814 INIT_LIST_HEAD(&joydev->client_list);
815 spin_lock_init(&joydev->client_lock);
816 mutex_init(&joydev->mutex);
817 init_waitqueue_head(&joydev->wait);
818
819 dev_set_name(&joydev->dev, "js%d", minor);
820 joydev->exist = 1;
821 joydev->minor = minor;
822
823 joydev->exist = 1;
824 joydev->handle.dev = input_get_device(dev);
825 joydev->handle.name = dev_name(&joydev->dev);
826 joydev->handle.handler = handler;
827 joydev->handle.private = joydev;
828
829 for (i = 0; i < ABS_MAX + 1; i++)
830 if (test_bit(i, dev->absbit)) {
831 joydev->absmap[i] = joydev->nabs;
832 joydev->abspam[joydev->nabs] = i;
833 joydev->nabs++;
834 }
835
836 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
837 if (test_bit(i + BTN_MISC, dev->keybit)) {
838 joydev->keymap[i] = joydev->nkey;
839 joydev->keypam[joydev->nkey] = i + BTN_MISC;
840 joydev->nkey++;
841 }
842
843 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
844 if (test_bit(i + BTN_MISC, dev->keybit)) {
845 joydev->keymap[i] = joydev->nkey;
846 joydev->keypam[joydev->nkey] = i + BTN_MISC;
847 joydev->nkey++;
848 }
849
850 for (i = 0; i < joydev->nabs; i++) {
851 j = joydev->abspam[i];
852 if (dev->absmax[j] == dev->absmin[j]) {
853 joydev->corr[i].type = JS_CORR_NONE;
854 joydev->abs[i] = dev->abs[j];
855 continue;
856 }
857 joydev->corr[i].type = JS_CORR_BROKEN;
858 joydev->corr[i].prec = dev->absfuzz[j];
859 joydev->corr[i].coef[0] =
860 (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
861 joydev->corr[i].coef[1] =
862 (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
863
864 t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
865 if (t) {
866 joydev->corr[i].coef[2] = (1 << 29) / t;
867 joydev->corr[i].coef[3] = (1 << 29) / t;
868
869 joydev->abs[i] = joydev_correct(dev->abs[j],
870 joydev->corr + i);
871 }
872 }
873
874 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
875 joydev->dev.class = &input_class;
876 joydev->dev.parent = &dev->dev;
877 joydev->dev.release = joydev_free;
878 device_initialize(&joydev->dev);
879
880 error = input_register_handle(&joydev->handle);
881 if (error)
882 goto err_free_joydev;
883
884 error = joydev_install_chrdev(joydev);
885 if (error)
886 goto err_unregister_handle;
887
888 error = device_add(&joydev->dev);
889 if (error)
890 goto err_cleanup_joydev;
891
892 return 0;
893
894 err_cleanup_joydev:
895 joydev_cleanup(joydev);
896 err_unregister_handle:
897 input_unregister_handle(&joydev->handle);
898 err_free_joydev:
899 put_device(&joydev->dev);
900 return error;
901 }
902
903 static void joydev_disconnect(struct input_handle *handle)
904 {
905 struct joydev *joydev = handle->private;
906
907 device_del(&joydev->dev);
908 joydev_cleanup(joydev);
909 input_unregister_handle(handle);
910 put_device(&joydev->dev);
911 }
912
913 static const struct input_device_id joydev_ids[] = {
914 {
915 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
916 INPUT_DEVICE_ID_MATCH_ABSBIT,
917 .evbit = { BIT_MASK(EV_ABS) },
918 .absbit = { BIT_MASK(ABS_X) },
919 },
920 {
921 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
922 INPUT_DEVICE_ID_MATCH_ABSBIT,
923 .evbit = { BIT_MASK(EV_ABS) },
924 .absbit = { BIT_MASK(ABS_WHEEL) },
925 },
926 {
927 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
928 INPUT_DEVICE_ID_MATCH_ABSBIT,
929 .evbit = { BIT_MASK(EV_ABS) },
930 .absbit = { BIT_MASK(ABS_THROTTLE) },
931 },
932 { } /* Terminating entry */
933 };
934
935 MODULE_DEVICE_TABLE(input, joydev_ids);
936
937 static struct input_handler joydev_handler = {
938 .event = joydev_event,
939 .match = joydev_match,
940 .connect = joydev_connect,
941 .disconnect = joydev_disconnect,
942 .fops = &joydev_fops,
943 .minor = JOYDEV_MINOR_BASE,
944 .name = "joydev",
945 .id_table = joydev_ids,
946 };
947
948 static int __init joydev_init(void)
949 {
950 return input_register_handler(&joydev_handler);
951 }
952
953 static void __exit joydev_exit(void)
954 {
955 input_unregister_handler(&joydev_handler);
956 }
957
958 module_init(joydev_init);
959 module_exit(joydev_exit);