projects/linux·blob v2.6.31 · refs

916 lines · 21.4 KiB

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 struct input_handle handle;
43 wait_queue_head_t wait;
44 struct list_head client_list;
45 spinlock_t client_lock; /* protects client_list */
46 struct mutex mutex;
47 struct device dev;
48
49 struct js_corr corr[ABS_MAX + 1];
50 struct JS_DATA_SAVE_TYPE glue;
51 int nabs;
52 int nkey;
53 __u16 keymap[KEY_MAX - BTN_MISC + 1];
54 __u16 keypam[KEY_MAX - BTN_MISC + 1];
55 __u8 absmap[ABS_MAX + 1];
56 __u8 abspam[ABS_MAX + 1];
57 __s16 abs[ABS_MAX + 1];
58};
59
60struct joydev_client {
61 struct js_event buffer[JOYDEV_BUFFER_SIZE];
62 int head;
63 int tail;
64 int startup;
65 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
66 struct fasync_struct *fasync;
67 struct joydev *joydev;
68 struct list_head node;
69};
70
71static struct joydev *joydev_table[JOYDEV_MINORS];
72static DEFINE_MUTEX(joydev_table_mutex);
73
74static int joydev_correct(int value, struct js_corr *corr)
75{
76 switch (corr->type) {
77
78 case JS_CORR_NONE:
79 break;
80
81 case JS_CORR_BROKEN:
82 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
83 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
84 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
85 break;
86
87 default:
88 return 0;
89 }
90
91 return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
92}
93
94static void joydev_pass_event(struct joydev_client *client,
95 struct js_event *event)
96{
97 struct joydev *joydev = client->joydev;
98
99 /*
100 * IRQs already disabled, just acquire the lock
101 */
102 spin_lock(&client->buffer_lock);
103
104 client->buffer[client->head] = *event;
105
106 if (client->startup == joydev->nabs + joydev->nkey) {
107 client->head++;
108 client->head &= JOYDEV_BUFFER_SIZE - 1;
109 if (client->tail == client->head)
110 client->startup = 0;
111 }
112
113 spin_unlock(&client->buffer_lock);
114
115 kill_fasync(&client->fasync, SIGIO, POLL_IN);
116}
117
118static void joydev_event(struct input_handle *handle,
119 unsigned int type, unsigned int code, int value)
120{
121 struct joydev *joydev = handle->private;
122 struct joydev_client *client;
123 struct js_event event;
124
125 switch (type) {
126
127 case EV_KEY:
128 if (code < BTN_MISC || value == 2)
129 return;
130 event.type = JS_EVENT_BUTTON;
131 event.number = joydev->keymap[code - BTN_MISC];
132 event.value = value;
133 break;
134
135 case EV_ABS:
136 event.type = JS_EVENT_AXIS;
137 event.number = joydev->absmap[code];
138 event.value = joydev_correct(value,
139 &joydev->corr[event.number]);
140 if (event.value == joydev->abs[event.number])
141 return;
142 joydev->abs[event.number] = event.value;
143 break;
144
145 default:
146 return;
147 }
148
149 event.time = jiffies_to_msecs(jiffies);
150
151 rcu_read_lock();
152 list_for_each_entry_rcu(client, &joydev->client_list, node)
153 joydev_pass_event(client, &event);
154 rcu_read_unlock();
155
156 wake_up_interruptible(&joydev->wait);
157}
158
159static int joydev_fasync(int fd, struct file *file, int on)
160{
161 struct joydev_client *client = file->private_data;
162
163 return fasync_helper(fd, file, on, &client->fasync);
164}
165
166static void joydev_free(struct device *dev)
167{
168 struct joydev *joydev = container_of(dev, struct joydev, dev);
169
170 input_put_device(joydev->handle.dev);
171 kfree(joydev);
172}
173
174static void joydev_attach_client(struct joydev *joydev,
175 struct joydev_client *client)
176{
177 spin_lock(&joydev->client_lock);
178 list_add_tail_rcu(&client->node, &joydev->client_list);
179 spin_unlock(&joydev->client_lock);
180 synchronize_rcu();
181}
182
183static void joydev_detach_client(struct joydev *joydev,
184 struct joydev_client *client)
185{
186 spin_lock(&joydev->client_lock);
187 list_del_rcu(&client->node);
188 spin_unlock(&joydev->client_lock);
189 synchronize_rcu();
190}
191
192static int joydev_open_device(struct joydev *joydev)
193{
194 int retval;
195
196 retval = mutex_lock_interruptible(&joydev->mutex);
197 if (retval)
198 return retval;
199
200 if (!joydev->exist)
201 retval = -ENODEV;
202 else if (!joydev->open++) {
203 retval = input_open_device(&joydev->handle);
204 if (retval)
205 joydev->open--;
206 }
207
208 mutex_unlock(&joydev->mutex);
209 return retval;
210}
211
212static void joydev_close_device(struct joydev *joydev)
213{
214 mutex_lock(&joydev->mutex);
215
216 if (joydev->exist && !--joydev->open)
217 input_close_device(&joydev->handle);
218
219 mutex_unlock(&joydev->mutex);
220}
221
222/*
223 * Wake up users waiting for IO so they can disconnect from
224 * dead device.
225 */
226static void joydev_hangup(struct joydev *joydev)
227{
228 struct joydev_client *client;
229
230 spin_lock(&joydev->client_lock);
231 list_for_each_entry(client, &joydev->client_list, node)
232 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
233 spin_unlock(&joydev->client_lock);
234
235 wake_up_interruptible(&joydev->wait);
236}
237
238static int joydev_release(struct inode *inode, struct file *file)
239{
240 struct joydev_client *client = file->private_data;
241 struct joydev *joydev = client->joydev;
242
243 joydev_detach_client(joydev, client);
244 kfree(client);
245
246 joydev_close_device(joydev);
247 put_device(&joydev->dev);
248
249 return 0;
250}
251
252static int joydev_open(struct inode *inode, struct file *file)
253{
254 struct joydev_client *client;
255 struct joydev *joydev;
256 int i = iminor(inode) - JOYDEV_MINOR_BASE;
257 int error;
258
259 if (i >= JOYDEV_MINORS)
260 return -ENODEV;
261
262 error = mutex_lock_interruptible(&joydev_table_mutex);
263 if (error)
264 return error;
265 joydev = joydev_table[i];
266 if (joydev)
267 get_device(&joydev->dev);
268 mutex_unlock(&joydev_table_mutex);
269
270 if (!joydev)
271 return -ENODEV;
272
273 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
274 if (!client) {
275 error = -ENOMEM;
276 goto err_put_joydev;
277 }
278
279 spin_lock_init(&client->buffer_lock);
280 client->joydev = joydev;
281 joydev_attach_client(joydev, client);
282
283 error = joydev_open_device(joydev);
284 if (error)
285 goto err_free_client;
286
287 file->private_data = client;
288 return 0;
289
290 err_free_client:
291 joydev_detach_client(joydev, client);
292 kfree(client);
293 err_put_joydev:
294 put_device(&joydev->dev);
295 return error;
296}
297
298static int joydev_generate_startup_event(struct joydev_client *client,
299 struct input_dev *input,
300 struct js_event *event)
301{
302 struct joydev *joydev = client->joydev;
303 int have_event;
304
305 spin_lock_irq(&client->buffer_lock);
306
307 have_event = client->startup < joydev->nabs + joydev->nkey;
308
309 if (have_event) {
310
311 event->time = jiffies_to_msecs(jiffies);
312 if (client->startup < joydev->nkey) {
313 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
314 event->number = client->startup;
315 event->value = !!test_bit(joydev->keypam[event->number],
316 input->key);
317 } else {
318 event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
319 event->number = client->startup - joydev->nkey;
320 event->value = joydev->abs[event->number];
321 }
322 client->startup++;
323 }
324
325 spin_unlock_irq(&client->buffer_lock);
326
327 return have_event;
328}
329
330static int joydev_fetch_next_event(struct joydev_client *client,
331 struct js_event *event)
332{
333 int have_event;
334
335 spin_lock_irq(&client->buffer_lock);
336
337 have_event = client->head != client->tail;
338 if (have_event) {
339 *event = client->buffer[client->tail++];
340 client->tail &= JOYDEV_BUFFER_SIZE - 1;
341 }
342
343 spin_unlock_irq(&client->buffer_lock);
344
345 return have_event;
346}
347
348/*
349 * Old joystick interface
350 */
351static ssize_t joydev_0x_read(struct joydev_client *client,
352 struct input_dev *input,
353 char __user *buf)
354{
355 struct joydev *joydev = client->joydev;
356 struct JS_DATA_TYPE data;
357 int i;
358
359 spin_lock_irq(&input->event_lock);
360
361 /*
362 * Get device state
363 */
364 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
365 data.buttons |=
366 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
367 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
368 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
369
370 /*
371 * Reset reader's event queue
372 */
373 spin_lock(&client->buffer_lock);
374 client->startup = 0;
375 client->tail = client->head;
376 spin_unlock(&client->buffer_lock);
377
378 spin_unlock_irq(&input->event_lock);
379
380 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
381 return -EFAULT;
382
383 return sizeof(struct JS_DATA_TYPE);
384}
385
386static inline int joydev_data_pending(struct joydev_client *client)
387{
388 struct joydev *joydev = client->joydev;
389
390 return client->startup < joydev->nabs + joydev->nkey ||
391 client->head != client->tail;
392}
393
394static ssize_t joydev_read(struct file *file, char __user *buf,
395 size_t count, loff_t *ppos)
396{
397 struct joydev_client *client = file->private_data;
398 struct joydev *joydev = client->joydev;
399 struct input_dev *input = joydev->handle.dev;
400 struct js_event event;
401 int retval;
402
403 if (!joydev->exist)
404 return -ENODEV;
405
406 if (count < sizeof(struct js_event))
407 return -EINVAL;
408
409 if (count == sizeof(struct JS_DATA_TYPE))
410 return joydev_0x_read(client, input, buf);
411
412 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
413 return -EAGAIN;
414
415 retval = wait_event_interruptible(joydev->wait,
416 !joydev->exist || joydev_data_pending(client));
417 if (retval)
418 return retval;
419
420 if (!joydev->exist)
421 return -ENODEV;
422
423 while (retval + sizeof(struct js_event) <= count &&
424 joydev_generate_startup_event(client, input, &event)) {
425
426 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
427 return -EFAULT;
428
429 retval += sizeof(struct js_event);
430 }
431
432 while (retval + sizeof(struct js_event) <= count &&
433 joydev_fetch_next_event(client, &event)) {
434
435 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
436 return -EFAULT;
437
438 retval += sizeof(struct js_event);
439 }
440
441 return retval;
442}
443
444/* No kernel lock - fine */
445static unsigned int joydev_poll(struct file *file, poll_table *wait)
446{
447 struct joydev_client *client = file->private_data;
448 struct joydev *joydev = client->joydev;
449
450 poll_wait(file, &joydev->wait, wait);
451 return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
452 (joydev->exist ? 0 : (POLLHUP | POLLERR));
453}
454
455static int joydev_ioctl_common(struct joydev *joydev,
456 unsigned int cmd, void __user *argp)
457{
458 struct input_dev *dev = joydev->handle.dev;
459 size_t len;
460 int i, j;
461 const char *name;
462
463 /* Process fixed-sized commands. */
464 switch (cmd) {
465
466 case JS_SET_CAL:
467 return copy_from_user(&joydev->glue.JS_CORR, argp,
468 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
469
470 case JS_GET_CAL:
471 return copy_to_user(argp, &joydev->glue.JS_CORR,
472 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
473
474 case JS_SET_TIMEOUT:
475 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
476
477 case JS_GET_TIMEOUT:
478 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
479
480 case JSIOCGVERSION:
481 return put_user(JS_VERSION, (__u32 __user *) argp);
482
483 case JSIOCGAXES:
484 return put_user(joydev->nabs, (__u8 __user *) argp);
485
486 case JSIOCGBUTTONS:
487 return put_user(joydev->nkey, (__u8 __user *) argp);
488
489 case JSIOCSCORR:
490 if (copy_from_user(joydev->corr, argp,
491 sizeof(joydev->corr[0]) * joydev->nabs))
492 return -EFAULT;
493
494 for (i = 0; i < joydev->nabs; i++) {
495 j = joydev->abspam[i];
496 joydev->abs[i] = joydev_correct(dev->abs[j],
497 &joydev->corr[i]);
498 }
499 return 0;
500
501 case JSIOCGCORR:
502 return copy_to_user(argp, joydev->corr,
503 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
504
505 }
506
507 /*
508 * Process variable-sized commands (the axis and button map commands
509 * are considered variable-sized to decouple them from the values of
510 * ABS_MAX and KEY_MAX).
511 */
512 switch (cmd & ~IOCSIZE_MASK) {
513
514 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
515 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
516 /*
517 * FIXME: we should not copy into our axis map before
518 * validating the data.
519 */
520 if (copy_from_user(joydev->abspam, argp, len))
521 return -EFAULT;
522
523 for (i = 0; i < joydev->nabs; i++) {
524 if (joydev->abspam[i] > ABS_MAX)
525 return -EINVAL;
526 joydev->absmap[joydev->abspam[i]] = i;
527 }
528 return 0;
529
530 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
531 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
532 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : 0;
533
534 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
535 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
536 /*
537 * FIXME: we should not copy into our keymap before
538 * validating the data.
539 */
540 if (copy_from_user(joydev->keypam, argp, len))
541 return -EFAULT;
542
543 for (i = 0; i < joydev->nkey; i++) {
544 if (joydev->keypam[i] > KEY_MAX ||
545 joydev->keypam[i] < BTN_MISC)
546 return -EINVAL;
547 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
548 }
549
550 return 0;
551
552 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
553 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
554 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : 0;
555
556 case JSIOCGNAME(0):
557 name = dev->name;
558 if (!name)
559 return 0;
560
561 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
562 return copy_to_user(argp, name, len) ? -EFAULT : len;
563 }
564
565 return -EINVAL;
566}
567
568#ifdef CONFIG_COMPAT
569static long joydev_compat_ioctl(struct file *file,
570 unsigned int cmd, unsigned long arg)
571{
572 struct joydev_client *client = file->private_data;
573 struct joydev *joydev = client->joydev;
574 void __user *argp = (void __user *)arg;
575 s32 tmp32;
576 struct JS_DATA_SAVE_TYPE_32 ds32;
577 int retval;
578
579 retval = mutex_lock_interruptible(&joydev->mutex);
580 if (retval)
581 return retval;
582
583 if (!joydev->exist) {
584 retval = -ENODEV;
585 goto out;
586 }
587
588 switch (cmd) {
589
590 case JS_SET_TIMELIMIT:
591 retval = get_user(tmp32, (s32 __user *) arg);
592 if (retval == 0)
593 joydev->glue.JS_TIMELIMIT = tmp32;
594 break;
595
596 case JS_GET_TIMELIMIT:
597 tmp32 = joydev->glue.JS_TIMELIMIT;
598 retval = put_user(tmp32, (s32 __user *) arg);
599 break;
600
601 case JS_SET_ALL:
602 retval = copy_from_user(&ds32, argp,
603 sizeof(ds32)) ? -EFAULT : 0;
604 if (retval == 0) {
605 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
606 joydev->glue.BUSY = ds32.BUSY;
607 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
608 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
609 joydev->glue.JS_SAVE = ds32.JS_SAVE;
610 joydev->glue.JS_CORR = ds32.JS_CORR;
611 }
612 break;
613
614 case JS_GET_ALL:
615 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
616 ds32.BUSY = joydev->glue.BUSY;
617 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
618 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
619 ds32.JS_SAVE = joydev->glue.JS_SAVE;
620 ds32.JS_CORR = joydev->glue.JS_CORR;
621
622 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
623 break;
624
625 default:
626 retval = joydev_ioctl_common(joydev, cmd, argp);
627 break;
628 }
629
630 out:
631 mutex_unlock(&joydev->mutex);
632 return retval;
633}
634#endif /* CONFIG_COMPAT */
635
636static long joydev_ioctl(struct file *file,
637 unsigned int cmd, unsigned long arg)
638{
639 struct joydev_client *client = file->private_data;
640 struct joydev *joydev = client->joydev;
641 void __user *argp = (void __user *)arg;
642 int retval;
643
644 retval = mutex_lock_interruptible(&joydev->mutex);
645 if (retval)
646 return retval;
647
648 if (!joydev->exist) {
649 retval = -ENODEV;
650 goto out;
651 }
652
653 switch (cmd) {
654
655 case JS_SET_TIMELIMIT:
656 retval = get_user(joydev->glue.JS_TIMELIMIT,
657 (long __user *) arg);
658 break;
659
660 case JS_GET_TIMELIMIT:
661 retval = put_user(joydev->glue.JS_TIMELIMIT,
662 (long __user *) arg);
663 break;
664
665 case JS_SET_ALL:
666 retval = copy_from_user(&joydev->glue, argp,
667 sizeof(joydev->glue)) ? -EFAULT: 0;
668 break;
669
670 case JS_GET_ALL:
671 retval = copy_to_user(argp, &joydev->glue,
672 sizeof(joydev->glue)) ? -EFAULT : 0;
673 break;
674
675 default:
676 retval = joydev_ioctl_common(joydev, cmd, argp);
677 break;
678 }
679 out:
680 mutex_unlock(&joydev->mutex);
681 return retval;
682}
683
684static const struct file_operations joydev_fops = {
685 .owner = THIS_MODULE,
686 .read = joydev_read,
687 .poll = joydev_poll,
688 .open = joydev_open,
689 .release = joydev_release,
690 .unlocked_ioctl = joydev_ioctl,
691#ifdef CONFIG_COMPAT
692 .compat_ioctl = joydev_compat_ioctl,
693#endif
694 .fasync = joydev_fasync,
695};
696
697static int joydev_install_chrdev(struct joydev *joydev)
698{
699 joydev_table[joydev->minor] = joydev;
700 return 0;
701}
702
703static void joydev_remove_chrdev(struct joydev *joydev)
704{
705 mutex_lock(&joydev_table_mutex);
706 joydev_table[joydev->minor] = NULL;
707 mutex_unlock(&joydev_table_mutex);
708}
709
710/*
711 * Mark device non-existant. This disables writes, ioctls and
712 * prevents new users from opening the device. Already posted
713 * blocking reads will stay, however new ones will fail.
714 */
715static void joydev_mark_dead(struct joydev *joydev)
716{
717 mutex_lock(&joydev->mutex);
718 joydev->exist = 0;
719 mutex_unlock(&joydev->mutex);
720}
721
722static void joydev_cleanup(struct joydev *joydev)
723{
724 struct input_handle *handle = &joydev->handle;
725
726 joydev_mark_dead(joydev);
727 joydev_hangup(joydev);
728 joydev_remove_chrdev(joydev);
729
730 /* joydev is marked dead so noone else accesses joydev->open */
731 if (joydev->open)
732 input_close_device(handle);
733}
734
735static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
736 const struct input_device_id *id)
737{
738 struct joydev *joydev;
739 int i, j, t, minor;
740 int error;
741
742 for (minor = 0; minor < JOYDEV_MINORS; minor++)
743 if (!joydev_table[minor])
744 break;
745
746 if (minor == JOYDEV_MINORS) {
747 printk(KERN_ERR "joydev: no more free joydev devices\n");
748 return -ENFILE;
749 }
750
751 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
752 if (!joydev)
753 return -ENOMEM;
754
755 INIT_LIST_HEAD(&joydev->client_list);
756 spin_lock_init(&joydev->client_lock);
757 mutex_init(&joydev->mutex);
758 init_waitqueue_head(&joydev->wait);
759
760 dev_set_name(&joydev->dev, "js%d", minor);
761 joydev->exist = 1;
762 joydev->minor = minor;
763
764 joydev->exist = 1;
765 joydev->handle.dev = input_get_device(dev);
766 joydev->handle.name = dev_name(&joydev->dev);
767 joydev->handle.handler = handler;
768 joydev->handle.private = joydev;
769
770 for (i = 0; i < ABS_MAX + 1; i++)
771 if (test_bit(i, dev->absbit)) {
772 joydev->absmap[i] = joydev->nabs;
773 joydev->abspam[joydev->nabs] = i;
774 joydev->nabs++;
775 }
776
777 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
778 if (test_bit(i + BTN_MISC, dev->keybit)) {
779 joydev->keymap[i] = joydev->nkey;
780 joydev->keypam[joydev->nkey] = i + BTN_MISC;
781 joydev->nkey++;
782 }
783
784 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
785 if (test_bit(i + BTN_MISC, dev->keybit)) {
786 joydev->keymap[i] = joydev->nkey;
787 joydev->keypam[joydev->nkey] = i + BTN_MISC;
788 joydev->nkey++;
789 }
790
791 for (i = 0; i < joydev->nabs; i++) {
792 j = joydev->abspam[i];
793 if (dev->absmax[j] == dev->absmin[j]) {
794 joydev->corr[i].type = JS_CORR_NONE;
795 joydev->abs[i] = dev->abs[j];
796 continue;
797 }
798 joydev->corr[i].type = JS_CORR_BROKEN;
799 joydev->corr[i].prec = dev->absfuzz[j];
800 joydev->corr[i].coef[0] =
801 (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
802 joydev->corr[i].coef[1] =
803 (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
804
805 t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
806 if (t) {
807 joydev->corr[i].coef[2] = (1 << 29) / t;
808 joydev->corr[i].coef[3] = (1 << 29) / t;
809
810 joydev->abs[i] = joydev_correct(dev->abs[j],
811 joydev->corr + i);
812 }
813 }
814
815 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
816 joydev->dev.class = &input_class;
817 joydev->dev.parent = &dev->dev;
818 joydev->dev.release = joydev_free;
819 device_initialize(&joydev->dev);
820
821 error = input_register_handle(&joydev->handle);
822 if (error)
823 goto err_free_joydev;
824
825 error = joydev_install_chrdev(joydev);
826 if (error)
827 goto err_unregister_handle;
828
829 error = device_add(&joydev->dev);
830 if (error)
831 goto err_cleanup_joydev;
832
833 return 0;
834
835 err_cleanup_joydev:
836 joydev_cleanup(joydev);
837 err_unregister_handle:
838 input_unregister_handle(&joydev->handle);
839 err_free_joydev:
840 put_device(&joydev->dev);
841 return error;
842}
843
844static void joydev_disconnect(struct input_handle *handle)
845{
846 struct joydev *joydev = handle->private;
847
848 device_del(&joydev->dev);
849 joydev_cleanup(joydev);
850 input_unregister_handle(handle);
851 put_device(&joydev->dev);
852}
853
854static const struct input_device_id joydev_blacklist[] = {
855 {
856 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
857 INPUT_DEVICE_ID_MATCH_KEYBIT,
858 .evbit = { BIT_MASK(EV_KEY) },
859 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
860 }, /* Avoid itouchpads and touchscreens */
861 {
862 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
863 INPUT_DEVICE_ID_MATCH_KEYBIT,
864 .evbit = { BIT_MASK(EV_KEY) },
865 .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) },
866 }, /* Avoid tablets, digitisers and similar devices */
867 { } /* Terminating entry */
868};
869
870static const struct input_device_id joydev_ids[] = {
871 {
872 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
873 INPUT_DEVICE_ID_MATCH_ABSBIT,
874 .evbit = { BIT_MASK(EV_ABS) },
875 .absbit = { BIT_MASK(ABS_X) },
876 },
877 {
878 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
879 INPUT_DEVICE_ID_MATCH_ABSBIT,
880 .evbit = { BIT_MASK(EV_ABS) },
881 .absbit = { BIT_MASK(ABS_WHEEL) },
882 },
883 {
884 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
885 INPUT_DEVICE_ID_MATCH_ABSBIT,
886 .evbit = { BIT_MASK(EV_ABS) },
887 .absbit = { BIT_MASK(ABS_THROTTLE) },
888 },
889 { } /* Terminating entry */
890};
891
892MODULE_DEVICE_TABLE(input, joydev_ids);
893
894static struct input_handler joydev_handler = {
895 .event = joydev_event,
896 .connect = joydev_connect,
897 .disconnect = joydev_disconnect,
898 .fops = &joydev_fops,
899 .minor = JOYDEV_MINOR_BASE,
900 .name = "joydev",
901 .id_table = joydev_ids,
902 .blacklist = joydev_blacklist,
903};
904
905static int __init joydev_init(void)
906{
907 return input_register_handler(&joydev_handler);
908}
909
910static void __exit joydev_exit(void)
911{
912 input_unregister_handler(&joydev_handler);
913}
914
915module_init(joydev_init);
916module_exit(joydev_exit);