projects/linux·blob v2.6.28 · refs

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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#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/slab.h>
22#include <linux/mm.h>
23#include <linux/miscdevice.h>
24#include <linux/module.h>
25#include <linux/poll.h>
26#include <linux/init.h>
27#include <linux/device.h>
28
29MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
30MODULE_DESCRIPTION("Joystick device interfaces");
31MODULE_SUPPORTED_DEVICE("input/js");
32MODULE_LICENSE("GPL");
33
34#define JOYDEV_MINOR_BASE 0
35#define JOYDEV_MINORS 16
36#define JOYDEV_BUFFER_SIZE 64
37
38struct joydev {
39 int exist;
40 int open;
41 int minor;
42 char name[16];
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
61struct 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
72static struct joydev *joydev_table[JOYDEV_MINORS];
73static DEFINE_MUTEX(joydev_table_mutex);
74
75static 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
95static 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
119static 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
160static int joydev_fasync(int fd, struct file *file, int on)
161{
162 int retval;
163 struct joydev_client *client = file->private_data;
164
165 retval = fasync_helper(fd, file, on, &client->fasync);
166
167 return retval < 0 ? retval : 0;
168}
169
170static void joydev_free(struct device *dev)
171{
172 struct joydev *joydev = container_of(dev, struct joydev, dev);
173
174 input_put_device(joydev->handle.dev);
175 kfree(joydev);
176}
177
178static void joydev_attach_client(struct joydev *joydev,
179 struct joydev_client *client)
180{
181 spin_lock(&joydev->client_lock);
182 list_add_tail_rcu(&client->node, &joydev->client_list);
183 spin_unlock(&joydev->client_lock);
184 synchronize_rcu();
185}
186
187static void joydev_detach_client(struct joydev *joydev,
188 struct joydev_client *client)
189{
190 spin_lock(&joydev->client_lock);
191 list_del_rcu(&client->node);
192 spin_unlock(&joydev->client_lock);
193 synchronize_rcu();
194}
195
196static int joydev_open_device(struct joydev *joydev)
197{
198 int retval;
199
200 retval = mutex_lock_interruptible(&joydev->mutex);
201 if (retval)
202 return retval;
203
204 if (!joydev->exist)
205 retval = -ENODEV;
206 else if (!joydev->open++) {
207 retval = input_open_device(&joydev->handle);
208 if (retval)
209 joydev->open--;
210 }
211
212 mutex_unlock(&joydev->mutex);
213 return retval;
214}
215
216static void joydev_close_device(struct joydev *joydev)
217{
218 mutex_lock(&joydev->mutex);
219
220 if (joydev->exist && !--joydev->open)
221 input_close_device(&joydev->handle);
222
223 mutex_unlock(&joydev->mutex);
224}
225
226/*
227 * Wake up users waiting for IO so they can disconnect from
228 * dead device.
229 */
230static void joydev_hangup(struct joydev *joydev)
231{
232 struct joydev_client *client;
233
234 spin_lock(&joydev->client_lock);
235 list_for_each_entry(client, &joydev->client_list, node)
236 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
237 spin_unlock(&joydev->client_lock);
238
239 wake_up_interruptible(&joydev->wait);
240}
241
242static int joydev_release(struct inode *inode, struct file *file)
243{
244 struct joydev_client *client = file->private_data;
245 struct joydev *joydev = client->joydev;
246
247 joydev_detach_client(joydev, client);
248 kfree(client);
249
250 joydev_close_device(joydev);
251 put_device(&joydev->dev);
252
253 return 0;
254}
255
256static int joydev_open(struct inode *inode, struct file *file)
257{
258 struct joydev_client *client;
259 struct joydev *joydev;
260 int i = iminor(inode) - JOYDEV_MINOR_BASE;
261 int error;
262
263 if (i >= JOYDEV_MINORS)
264 return -ENODEV;
265
266 error = mutex_lock_interruptible(&joydev_table_mutex);
267 if (error)
268 return error;
269 joydev = joydev_table[i];
270 if (joydev)
271 get_device(&joydev->dev);
272 mutex_unlock(&joydev_table_mutex);
273
274 if (!joydev)
275 return -ENODEV;
276
277 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
278 if (!client) {
279 error = -ENOMEM;
280 goto err_put_joydev;
281 }
282
283 spin_lock_init(&client->buffer_lock);
284 client->joydev = joydev;
285 joydev_attach_client(joydev, client);
286
287 error = joydev_open_device(joydev);
288 if (error)
289 goto err_free_client;
290
291 file->private_data = client;
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_ioctl_common(struct joydev *joydev,
460 unsigned int cmd, void __user *argp)
461{
462 struct input_dev *dev = joydev->handle.dev;
463 int i, j;
464
465 switch (cmd) {
466
467 case JS_SET_CAL:
468 return copy_from_user(&joydev->glue.JS_CORR, argp,
469 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
470
471 case JS_GET_CAL:
472 return copy_to_user(argp, &joydev->glue.JS_CORR,
473 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
474
475 case JS_SET_TIMEOUT:
476 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
477
478 case JS_GET_TIMEOUT:
479 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
480
481 case JSIOCGVERSION:
482 return put_user(JS_VERSION, (__u32 __user *) argp);
483
484 case JSIOCGAXES:
485 return put_user(joydev->nabs, (__u8 __user *) argp);
486
487 case JSIOCGBUTTONS:
488 return put_user(joydev->nkey, (__u8 __user *) argp);
489
490 case JSIOCSCORR:
491 if (copy_from_user(joydev->corr, argp,
492 sizeof(joydev->corr[0]) * joydev->nabs))
493 return -EFAULT;
494
495 for (i = 0; i < joydev->nabs; i++) {
496 j = joydev->abspam[i];
497 joydev->abs[i] = joydev_correct(dev->abs[j],
498 &joydev->corr[i]);
499 }
500 return 0;
501
502 case JSIOCGCORR:
503 return copy_to_user(argp, joydev->corr,
504 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
505
506 case JSIOCSAXMAP:
507 if (copy_from_user(joydev->abspam, argp,
508 sizeof(__u8) * (ABS_MAX + 1)))
509 return -EFAULT;
510
511 for (i = 0; i < joydev->nabs; i++) {
512 if (joydev->abspam[i] > ABS_MAX)
513 return -EINVAL;
514 joydev->absmap[joydev->abspam[i]] = i;
515 }
516 return 0;
517
518 case JSIOCGAXMAP:
519 return copy_to_user(argp, joydev->abspam,
520 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
521
522 case JSIOCSBTNMAP:
523 if (copy_from_user(joydev->keypam, argp,
524 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
525 return -EFAULT;
526
527 for (i = 0; i < joydev->nkey; i++) {
528 if (joydev->keypam[i] > KEY_MAX ||
529 joydev->keypam[i] < BTN_MISC)
530 return -EINVAL;
531 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
532 }
533
534 return 0;
535
536 case JSIOCGBTNMAP:
537 return copy_to_user(argp, joydev->keypam,
538 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
539
540 default:
541 if ((cmd & ~IOCSIZE_MASK) == JSIOCGNAME(0)) {
542 int len;
543 if (!dev->name)
544 return 0;
545 len = strlen(dev->name) + 1;
546 if (len > _IOC_SIZE(cmd))
547 len = _IOC_SIZE(cmd);
548 if (copy_to_user(argp, dev->name, len))
549 return -EFAULT;
550 return len;
551 }
552 }
553 return -EINVAL;
554}
555
556#ifdef CONFIG_COMPAT
557static long joydev_compat_ioctl(struct file *file,
558 unsigned int cmd, unsigned long arg)
559{
560 struct joydev_client *client = file->private_data;
561 struct joydev *joydev = client->joydev;
562 void __user *argp = (void __user *)arg;
563 s32 tmp32;
564 struct JS_DATA_SAVE_TYPE_32 ds32;
565 int retval;
566
567 retval = mutex_lock_interruptible(&joydev->mutex);
568 if (retval)
569 return retval;
570
571 if (!joydev->exist) {
572 retval = -ENODEV;
573 goto out;
574 }
575
576 switch (cmd) {
577
578 case JS_SET_TIMELIMIT:
579 retval = get_user(tmp32, (s32 __user *) arg);
580 if (retval == 0)
581 joydev->glue.JS_TIMELIMIT = tmp32;
582 break;
583
584 case JS_GET_TIMELIMIT:
585 tmp32 = joydev->glue.JS_TIMELIMIT;
586 retval = put_user(tmp32, (s32 __user *) arg);
587 break;
588
589 case JS_SET_ALL:
590 retval = copy_from_user(&ds32, argp,
591 sizeof(ds32)) ? -EFAULT : 0;
592 if (retval == 0) {
593 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
594 joydev->glue.BUSY = ds32.BUSY;
595 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
596 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
597 joydev->glue.JS_SAVE = ds32.JS_SAVE;
598 joydev->glue.JS_CORR = ds32.JS_CORR;
599 }
600 break;
601
602 case JS_GET_ALL:
603 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
604 ds32.BUSY = joydev->glue.BUSY;
605 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
606 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
607 ds32.JS_SAVE = joydev->glue.JS_SAVE;
608 ds32.JS_CORR = joydev->glue.JS_CORR;
609
610 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
611 break;
612
613 default:
614 retval = joydev_ioctl_common(joydev, cmd, argp);
615 break;
616 }
617
618 out:
619 mutex_unlock(&joydev->mutex);
620 return retval;
621}
622#endif /* CONFIG_COMPAT */
623
624static long joydev_ioctl(struct file *file,
625 unsigned int cmd, unsigned long arg)
626{
627 struct joydev_client *client = file->private_data;
628 struct joydev *joydev = client->joydev;
629 void __user *argp = (void __user *)arg;
630 int retval;
631
632 retval = mutex_lock_interruptible(&joydev->mutex);
633 if (retval)
634 return retval;
635
636 if (!joydev->exist) {
637 retval = -ENODEV;
638 goto out;
639 }
640
641 switch (cmd) {
642
643 case JS_SET_TIMELIMIT:
644 retval = get_user(joydev->glue.JS_TIMELIMIT,
645 (long __user *) arg);
646 break;
647
648 case JS_GET_TIMELIMIT:
649 retval = put_user(joydev->glue.JS_TIMELIMIT,
650 (long __user *) arg);
651 break;
652
653 case JS_SET_ALL:
654 retval = copy_from_user(&joydev->glue, argp,
655 sizeof(joydev->glue)) ? -EFAULT: 0;
656 break;
657
658 case JS_GET_ALL:
659 retval = copy_to_user(argp, &joydev->glue,
660 sizeof(joydev->glue)) ? -EFAULT : 0;
661 break;
662
663 default:
664 retval = joydev_ioctl_common(joydev, cmd, argp);
665 break;
666 }
667 out:
668 mutex_unlock(&joydev->mutex);
669 return retval;
670}
671
672static const struct file_operations joydev_fops = {
673 .owner = THIS_MODULE,
674 .read = joydev_read,
675 .poll = joydev_poll,
676 .open = joydev_open,
677 .release = joydev_release,
678 .unlocked_ioctl = joydev_ioctl,
679#ifdef CONFIG_COMPAT
680 .compat_ioctl = joydev_compat_ioctl,
681#endif
682 .fasync = joydev_fasync,
683};
684
685static int joydev_install_chrdev(struct joydev *joydev)
686{
687 joydev_table[joydev->minor] = joydev;
688 return 0;
689}
690
691static void joydev_remove_chrdev(struct joydev *joydev)
692{
693 mutex_lock(&joydev_table_mutex);
694 joydev_table[joydev->minor] = NULL;
695 mutex_unlock(&joydev_table_mutex);
696}
697
698/*
699 * Mark device non-existant. This disables writes, ioctls and
700 * prevents new users from opening the device. Already posted
701 * blocking reads will stay, however new ones will fail.
702 */
703static void joydev_mark_dead(struct joydev *joydev)
704{
705 mutex_lock(&joydev->mutex);
706 joydev->exist = 0;
707 mutex_unlock(&joydev->mutex);
708}
709
710static void joydev_cleanup(struct joydev *joydev)
711{
712 struct input_handle *handle = &joydev->handle;
713
714 joydev_mark_dead(joydev);
715 joydev_hangup(joydev);
716 joydev_remove_chrdev(joydev);
717
718 /* joydev is marked dead so noone else accesses joydev->open */
719 if (joydev->open)
720 input_close_device(handle);
721}
722
723static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
724 const struct input_device_id *id)
725{
726 struct joydev *joydev;
727 int i, j, t, minor;
728 int error;
729
730 for (minor = 0; minor < JOYDEV_MINORS; minor++)
731 if (!joydev_table[minor])
732 break;
733
734 if (minor == JOYDEV_MINORS) {
735 printk(KERN_ERR "joydev: no more free joydev devices\n");
736 return -ENFILE;
737 }
738
739 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
740 if (!joydev)
741 return -ENOMEM;
742
743 INIT_LIST_HEAD(&joydev->client_list);
744 spin_lock_init(&joydev->client_lock);
745 mutex_init(&joydev->mutex);
746 init_waitqueue_head(&joydev->wait);
747
748 snprintf(joydev->name, sizeof(joydev->name), "js%d", minor);
749 joydev->exist = 1;
750 joydev->minor = minor;
751
752 joydev->exist = 1;
753 joydev->handle.dev = input_get_device(dev);
754 joydev->handle.name = joydev->name;
755 joydev->handle.handler = handler;
756 joydev->handle.private = joydev;
757
758 for (i = 0; i < ABS_MAX + 1; i++)
759 if (test_bit(i, dev->absbit)) {
760 joydev->absmap[i] = joydev->nabs;
761 joydev->abspam[joydev->nabs] = i;
762 joydev->nabs++;
763 }
764
765 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
766 if (test_bit(i + BTN_MISC, dev->keybit)) {
767 joydev->keymap[i] = joydev->nkey;
768 joydev->keypam[joydev->nkey] = i + BTN_MISC;
769 joydev->nkey++;
770 }
771
772 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
773 if (test_bit(i + BTN_MISC, dev->keybit)) {
774 joydev->keymap[i] = joydev->nkey;
775 joydev->keypam[joydev->nkey] = i + BTN_MISC;
776 joydev->nkey++;
777 }
778
779 for (i = 0; i < joydev->nabs; i++) {
780 j = joydev->abspam[i];
781 if (dev->absmax[j] == dev->absmin[j]) {
782 joydev->corr[i].type = JS_CORR_NONE;
783 joydev->abs[i] = dev->abs[j];
784 continue;
785 }
786 joydev->corr[i].type = JS_CORR_BROKEN;
787 joydev->corr[i].prec = dev->absfuzz[j];
788 joydev->corr[i].coef[0] =
789 (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
790 joydev->corr[i].coef[1] =
791 (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
792
793 t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
794 if (t) {
795 joydev->corr[i].coef[2] = (1 << 29) / t;
796 joydev->corr[i].coef[3] = (1 << 29) / t;
797
798 joydev->abs[i] = joydev_correct(dev->abs[j],
799 joydev->corr + i);
800 }
801 }
802
803 strlcpy(joydev->dev.bus_id, joydev->name, sizeof(joydev->dev.bus_id));
804 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
805 joydev->dev.class = &input_class;
806 joydev->dev.parent = &dev->dev;
807 joydev->dev.release = joydev_free;
808 device_initialize(&joydev->dev);
809
810 error = input_register_handle(&joydev->handle);
811 if (error)
812 goto err_free_joydev;
813
814 error = joydev_install_chrdev(joydev);
815 if (error)
816 goto err_unregister_handle;
817
818 error = device_add(&joydev->dev);
819 if (error)
820 goto err_cleanup_joydev;
821
822 return 0;
823
824 err_cleanup_joydev:
825 joydev_cleanup(joydev);
826 err_unregister_handle:
827 input_unregister_handle(&joydev->handle);
828 err_free_joydev:
829 put_device(&joydev->dev);
830 return error;
831}
832
833static void joydev_disconnect(struct input_handle *handle)
834{
835 struct joydev *joydev = handle->private;
836
837 device_del(&joydev->dev);
838 joydev_cleanup(joydev);
839 input_unregister_handle(handle);
840 put_device(&joydev->dev);
841}
842
843static const struct input_device_id joydev_blacklist[] = {
844 {
845 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
846 INPUT_DEVICE_ID_MATCH_KEYBIT,
847 .evbit = { BIT_MASK(EV_KEY) },
848 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
849 }, /* Avoid itouchpads, touchscreens and tablets */
850 { } /* Terminating entry */
851};
852
853static const struct input_device_id joydev_ids[] = {
854 {
855 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
856 INPUT_DEVICE_ID_MATCH_ABSBIT,
857 .evbit = { BIT_MASK(EV_ABS) },
858 .absbit = { BIT_MASK(ABS_X) },
859 },
860 {
861 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
862 INPUT_DEVICE_ID_MATCH_ABSBIT,
863 .evbit = { BIT_MASK(EV_ABS) },
864 .absbit = { BIT_MASK(ABS_WHEEL) },
865 },
866 {
867 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
868 INPUT_DEVICE_ID_MATCH_ABSBIT,
869 .evbit = { BIT_MASK(EV_ABS) },
870 .absbit = { BIT_MASK(ABS_THROTTLE) },
871 },
872 { } /* Terminating entry */
873};
874
875MODULE_DEVICE_TABLE(input, joydev_ids);
876
877static struct input_handler joydev_handler = {
878 .event = joydev_event,
879 .connect = joydev_connect,
880 .disconnect = joydev_disconnect,
881 .fops = &joydev_fops,
882 .minor = JOYDEV_MINOR_BASE,
883 .name = "joydev",
884 .id_table = joydev_ids,
885 .blacklist = joydev_blacklist,
886};
887
888static int __init joydev_init(void)
889{
890 return input_register_handler(&joydev_handler);
891}
892
893static void __exit joydev_exit(void)
894{
895 input_unregister_handler(&joydev_handler);
896}
897
898module_init(joydev_init);
899module_exit(joydev_exit);