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x86: Cleanup highmap after brk is concluded
[linux/fpc-iii.git] / drivers / input / joydev.c
blob93c60e0f2b8e6a2432f06aec1ea81da0fdd6af70
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 return 0;
290
291 err_free_client:
292 joydev_detach_client(joydev, client);
293 kfree(client);
294 err_put_joydev:
295 put_device(&joydev->dev);
296 return error;
297 }
298
299 static int joydev_generate_startup_event(struct joydev_client *client,
300 struct input_dev *input,
301 struct js_event *event)
302 {
303 struct joydev *joydev = client->joydev;
304 int have_event;
305
306 spin_lock_irq(&client->buffer_lock);
307
308 have_event = client->startup < joydev->nabs + joydev->nkey;
309
310 if (have_event) {
311
312 event->time = jiffies_to_msecs(jiffies);
313 if (client->startup < joydev->nkey) {
314 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
315 event->number = client->startup;
316 event->value = !!test_bit(joydev->keypam[event->number],
317 input->key);
318 } else {
319 event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
320 event->number = client->startup - joydev->nkey;
321 event->value = joydev->abs[event->number];
322 }
323 client->startup++;
324 }
325
326 spin_unlock_irq(&client->buffer_lock);
327
328 return have_event;
329 }
330
331 static int joydev_fetch_next_event(struct joydev_client *client,
332 struct js_event *event)
333 {
334 int have_event;
335
336 spin_lock_irq(&client->buffer_lock);
337
338 have_event = client->head != client->tail;
339 if (have_event) {
340 *event = client->buffer[client->tail++];
341 client->tail &= JOYDEV_BUFFER_SIZE - 1;
342 }
343
344 spin_unlock_irq(&client->buffer_lock);
345
346 return have_event;
347 }
348
349 /*
350 * Old joystick interface
351 */
352 static ssize_t joydev_0x_read(struct joydev_client *client,
353 struct input_dev *input,
354 char __user *buf)
355 {
356 struct joydev *joydev = client->joydev;
357 struct JS_DATA_TYPE data;
358 int i;
359
360 spin_lock_irq(&input->event_lock);
361
362 /*
363 * Get device state
364 */
365 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
366 data.buttons |=
367 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
368 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
369 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
370
371 /*
372 * Reset reader's event queue
373 */
374 spin_lock(&client->buffer_lock);
375 client->startup = 0;
376 client->tail = client->head;
377 spin_unlock(&client->buffer_lock);
378
379 spin_unlock_irq(&input->event_lock);
380
381 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
382 return -EFAULT;
383
384 return sizeof(struct JS_DATA_TYPE);
385 }
386
387 static inline int joydev_data_pending(struct joydev_client *client)
388 {
389 struct joydev *joydev = client->joydev;
390
391 return client->startup < joydev->nabs + joydev->nkey ||
392 client->head != client->tail;
393 }
394
395 static ssize_t joydev_read(struct file *file, char __user *buf,
396 size_t count, loff_t *ppos)
397 {
398 struct joydev_client *client = file->private_data;
399 struct joydev *joydev = client->joydev;
400 struct input_dev *input = joydev->handle.dev;
401 struct js_event event;
402 int retval;
403
404 if (!joydev->exist)
405 return -ENODEV;
406
407 if (count < sizeof(struct js_event))
408 return -EINVAL;
409
410 if (count == sizeof(struct JS_DATA_TYPE))
411 return joydev_0x_read(client, input, buf);
412
413 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
414 return -EAGAIN;
415
416 retval = wait_event_interruptible(joydev->wait,
417 !joydev->exist || joydev_data_pending(client));
418 if (retval)
419 return retval;
420
421 if (!joydev->exist)
422 return -ENODEV;
423
424 while (retval + sizeof(struct js_event) <= count &&
425 joydev_generate_startup_event(client, input, &event)) {
426
427 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
428 return -EFAULT;
429
430 retval += sizeof(struct js_event);
431 }
432
433 while (retval + sizeof(struct js_event) <= count &&
434 joydev_fetch_next_event(client, &event)) {
435
436 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
437 return -EFAULT;
438
439 retval += sizeof(struct js_event);
440 }
441
442 return retval;
443 }
444
445 /* No kernel lock - fine */
446 static unsigned int joydev_poll(struct file *file, poll_table *wait)
447 {
448 struct joydev_client *client = file->private_data;
449 struct joydev *joydev = client->joydev;
450
451 poll_wait(file, &joydev->wait, wait);
452 return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
453 (joydev->exist ? 0 : (POLLHUP | POLLERR));
454 }
455
456 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
457 void __user *argp, size_t len)
458 {
459 __u8 *abspam;
460 int i;
461 int retval = 0;
462
463 len = min(len, sizeof(joydev->abspam));
464
465 /* Validate the map. */
466 abspam = kmalloc(len, GFP_KERNEL);
467 if (!abspam)
468 return -ENOMEM;
469
470 if (copy_from_user(abspam, argp, len)) {
471 retval = -EFAULT;
472 goto out;
473 }
474
475 for (i = 0; i < joydev->nabs; i++) {
476 if (abspam[i] > ABS_MAX) {
477 retval = -EINVAL;
478 goto out;
479 }
480 }
481
482 memcpy(joydev->abspam, abspam, len);
483
484 for (i = 0; i < joydev->nabs; i++)
485 joydev->absmap[joydev->abspam[i]] = i;
486
487 out:
488 kfree(abspam);
489 return retval;
490 }
491
492 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
493 void __user *argp, size_t len)
494 {
495 __u16 *keypam;
496 int i;
497 int retval = 0;
498
499 len = min(len, sizeof(joydev->keypam));
500
501 /* Validate the map. */
502 keypam = kmalloc(len, GFP_KERNEL);
503 if (!keypam)
504 return -ENOMEM;
505
506 if (copy_from_user(keypam, argp, len)) {
507 retval = -EFAULT;
508 goto out;
509 }
510
511 for (i = 0; i < joydev->nkey; i++) {
512 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
513 retval = -EINVAL;
514 goto out;
515 }
516 }
517
518 memcpy(joydev->keypam, keypam, len);
519
520 for (i = 0; i < joydev->nkey; i++)
521 joydev->keymap[keypam[i] - BTN_MISC] = i;
522
523 out:
524 kfree(keypam);
525 return retval;
526 }
527
528
529 static int joydev_ioctl_common(struct joydev *joydev,
530 unsigned int cmd, void __user *argp)
531 {
532 struct input_dev *dev = joydev->handle.dev;
533 size_t len;
534 int i, j;
535 const char *name;
536
537 /* Process fixed-sized commands. */
538 switch (cmd) {
539
540 case JS_SET_CAL:
541 return copy_from_user(&joydev->glue.JS_CORR, argp,
542 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
543
544 case JS_GET_CAL:
545 return copy_to_user(argp, &joydev->glue.JS_CORR,
546 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
547
548 case JS_SET_TIMEOUT:
549 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
550
551 case JS_GET_TIMEOUT:
552 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
553
554 case JSIOCGVERSION:
555 return put_user(JS_VERSION, (__u32 __user *) argp);
556
557 case JSIOCGAXES:
558 return put_user(joydev->nabs, (__u8 __user *) argp);
559
560 case JSIOCGBUTTONS:
561 return put_user(joydev->nkey, (__u8 __user *) argp);
562
563 case JSIOCSCORR:
564 if (copy_from_user(joydev->corr, argp,
565 sizeof(joydev->corr[0]) * joydev->nabs))
566 return -EFAULT;
567
568 for (i = 0; i < joydev->nabs; i++) {
569 j = joydev->abspam[i];
570 joydev->abs[i] = joydev_correct(dev->abs[j],
571 &joydev->corr[i]);
572 }
573 return 0;
574
575 case JSIOCGCORR:
576 return copy_to_user(argp, joydev->corr,
577 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
578
579 }
580
581 /*
582 * Process variable-sized commands (the axis and button map commands
583 * are considered variable-sized to decouple them from the values of
584 * ABS_MAX and KEY_MAX).
585 */
586 switch (cmd & ~IOCSIZE_MASK) {
587
588 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
589 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
590
591 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
592 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
593 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
594
595 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
596 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
597
598 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
599 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
600 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
601
602 case JSIOCGNAME(0):
603 name = dev->name;
604 if (!name)
605 return 0;
606
607 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
608 return copy_to_user(argp, name, len) ? -EFAULT : len;
609 }
610
611 return -EINVAL;
612 }
613
614 #ifdef CONFIG_COMPAT
615 static long joydev_compat_ioctl(struct file *file,
616 unsigned int cmd, unsigned long arg)
617 {
618 struct joydev_client *client = file->private_data;
619 struct joydev *joydev = client->joydev;
620 void __user *argp = (void __user *)arg;
621 s32 tmp32;
622 struct JS_DATA_SAVE_TYPE_32 ds32;
623 int retval;
624
625 retval = mutex_lock_interruptible(&joydev->mutex);
626 if (retval)
627 return retval;
628
629 if (!joydev->exist) {
630 retval = -ENODEV;
631 goto out;
632 }
633
634 switch (cmd) {
635
636 case JS_SET_TIMELIMIT:
637 retval = get_user(tmp32, (s32 __user *) arg);
638 if (retval == 0)
639 joydev->glue.JS_TIMELIMIT = tmp32;
640 break;
641
642 case JS_GET_TIMELIMIT:
643 tmp32 = joydev->glue.JS_TIMELIMIT;
644 retval = put_user(tmp32, (s32 __user *) arg);
645 break;
646
647 case JS_SET_ALL:
648 retval = copy_from_user(&ds32, argp,
649 sizeof(ds32)) ? -EFAULT : 0;
650 if (retval == 0) {
651 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
652 joydev->glue.BUSY = ds32.BUSY;
653 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
654 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
655 joydev->glue.JS_SAVE = ds32.JS_SAVE;
656 joydev->glue.JS_CORR = ds32.JS_CORR;
657 }
658 break;
659
660 case JS_GET_ALL:
661 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
662 ds32.BUSY = joydev->glue.BUSY;
663 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
664 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
665 ds32.JS_SAVE = joydev->glue.JS_SAVE;
666 ds32.JS_CORR = joydev->glue.JS_CORR;
667
668 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
669 break;
670
671 default:
672 retval = joydev_ioctl_common(joydev, cmd, argp);
673 break;
674 }
675
676 out:
677 mutex_unlock(&joydev->mutex);
678 return retval;
679 }
680 #endif /* CONFIG_COMPAT */
681
682 static long joydev_ioctl(struct file *file,
683 unsigned int cmd, unsigned long arg)
684 {
685 struct joydev_client *client = file->private_data;
686 struct joydev *joydev = client->joydev;
687 void __user *argp = (void __user *)arg;
688 int retval;
689
690 retval = mutex_lock_interruptible(&joydev->mutex);
691 if (retval)
692 return retval;
693
694 if (!joydev->exist) {
695 retval = -ENODEV;
696 goto out;
697 }
698
699 switch (cmd) {
700
701 case JS_SET_TIMELIMIT:
702 retval = get_user(joydev->glue.JS_TIMELIMIT,
703 (long __user *) arg);
704 break;
705
706 case JS_GET_TIMELIMIT:
707 retval = put_user(joydev->glue.JS_TIMELIMIT,
708 (long __user *) arg);
709 break;
710
711 case JS_SET_ALL:
712 retval = copy_from_user(&joydev->glue, argp,
713 sizeof(joydev->glue)) ? -EFAULT: 0;
714 break;
715
716 case JS_GET_ALL:
717 retval = copy_to_user(argp, &joydev->glue,
718 sizeof(joydev->glue)) ? -EFAULT : 0;
719 break;
720
721 default:
722 retval = joydev_ioctl_common(joydev, cmd, argp);
723 break;
724 }
725 out:
726 mutex_unlock(&joydev->mutex);
727 return retval;
728 }
729
730 static const struct file_operations joydev_fops = {
731 .owner = THIS_MODULE,
732 .read = joydev_read,
733 .poll = joydev_poll,
734 .open = joydev_open,
735 .release = joydev_release,
736 .unlocked_ioctl = joydev_ioctl,
737 #ifdef CONFIG_COMPAT
738 .compat_ioctl = joydev_compat_ioctl,
739 #endif
740 .fasync = joydev_fasync,
741 };
742
743 static int joydev_install_chrdev(struct joydev *joydev)
744 {
745 joydev_table[joydev->minor] = joydev;
746 return 0;
747 }
748
749 static void joydev_remove_chrdev(struct joydev *joydev)
750 {
751 mutex_lock(&joydev_table_mutex);
752 joydev_table[joydev->minor] = NULL;
753 mutex_unlock(&joydev_table_mutex);
754 }
755
756 /*
757 * Mark device non-existant. This disables writes, ioctls and
758 * prevents new users from opening the device. Already posted
759 * blocking reads will stay, however new ones will fail.
760 */
761 static void joydev_mark_dead(struct joydev *joydev)
762 {
763 mutex_lock(&joydev->mutex);
764 joydev->exist = 0;
765 mutex_unlock(&joydev->mutex);
766 }
767
768 static void joydev_cleanup(struct joydev *joydev)
769 {
770 struct input_handle *handle = &joydev->handle;
771
772 joydev_mark_dead(joydev);
773 joydev_hangup(joydev);
774 joydev_remove_chrdev(joydev);
775
776 /* joydev is marked dead so noone else accesses joydev->open */
777 if (joydev->open)
778 input_close_device(handle);
779 }
780
781 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
782 const struct input_device_id *id)
783 {
784 struct joydev *joydev;
785 int i, j, t, minor;
786 int error;
787
788 for (minor = 0; minor < JOYDEV_MINORS; minor++)
789 if (!joydev_table[minor])
790 break;
791
792 if (minor == JOYDEV_MINORS) {
793 printk(KERN_ERR "joydev: no more free joydev devices\n");
794 return -ENFILE;
795 }
796
797 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
798 if (!joydev)
799 return -ENOMEM;
800
801 INIT_LIST_HEAD(&joydev->client_list);
802 spin_lock_init(&joydev->client_lock);
803 mutex_init(&joydev->mutex);
804 init_waitqueue_head(&joydev->wait);
805
806 dev_set_name(&joydev->dev, "js%d", minor);
807 joydev->exist = 1;
808 joydev->minor = minor;
809
810 joydev->exist = 1;
811 joydev->handle.dev = input_get_device(dev);
812 joydev->handle.name = dev_name(&joydev->dev);
813 joydev->handle.handler = handler;
814 joydev->handle.private = joydev;
815
816 for (i = 0; i < ABS_MAX + 1; i++)
817 if (test_bit(i, dev->absbit)) {
818 joydev->absmap[i] = joydev->nabs;
819 joydev->abspam[joydev->nabs] = i;
820 joydev->nabs++;
821 }
822
823 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
824 if (test_bit(i + BTN_MISC, dev->keybit)) {
825 joydev->keymap[i] = joydev->nkey;
826 joydev->keypam[joydev->nkey] = i + BTN_MISC;
827 joydev->nkey++;
828 }
829
830 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
831 if (test_bit(i + BTN_MISC, dev->keybit)) {
832 joydev->keymap[i] = joydev->nkey;
833 joydev->keypam[joydev->nkey] = i + BTN_MISC;
834 joydev->nkey++;
835 }
836
837 for (i = 0; i < joydev->nabs; i++) {
838 j = joydev->abspam[i];
839 if (dev->absmax[j] == dev->absmin[j]) {
840 joydev->corr[i].type = JS_CORR_NONE;
841 joydev->abs[i] = dev->abs[j];
842 continue;
843 }
844 joydev->corr[i].type = JS_CORR_BROKEN;
845 joydev->corr[i].prec = dev->absfuzz[j];
846 joydev->corr[i].coef[0] =
847 (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
848 joydev->corr[i].coef[1] =
849 (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
850
851 t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
852 if (t) {
853 joydev->corr[i].coef[2] = (1 << 29) / t;
854 joydev->corr[i].coef[3] = (1 << 29) / t;
855
856 joydev->abs[i] = joydev_correct(dev->abs[j],
857 joydev->corr + i);
858 }
859 }
860
861 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
862 joydev->dev.class = &input_class;
863 joydev->dev.parent = &dev->dev;
864 joydev->dev.release = joydev_free;
865 device_initialize(&joydev->dev);
866
867 error = input_register_handle(&joydev->handle);
868 if (error)
869 goto err_free_joydev;
870
871 error = joydev_install_chrdev(joydev);
872 if (error)
873 goto err_unregister_handle;
874
875 error = device_add(&joydev->dev);
876 if (error)
877 goto err_cleanup_joydev;
878
879 return 0;
880
881 err_cleanup_joydev:
882 joydev_cleanup(joydev);
883 err_unregister_handle:
884 input_unregister_handle(&joydev->handle);
885 err_free_joydev:
886 put_device(&joydev->dev);
887 return error;
888 }
889
890 static void joydev_disconnect(struct input_handle *handle)
891 {
892 struct joydev *joydev = handle->private;
893
894 device_del(&joydev->dev);
895 joydev_cleanup(joydev);
896 input_unregister_handle(handle);
897 put_device(&joydev->dev);
898 }
899
900 static const struct input_device_id joydev_blacklist[] = {
901 {
902 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
903 INPUT_DEVICE_ID_MATCH_KEYBIT,
904 .evbit = { BIT_MASK(EV_KEY) },
905 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
906 }, /* Avoid itouchpads and touchscreens */
907 {
908 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
909 INPUT_DEVICE_ID_MATCH_KEYBIT,
910 .evbit = { BIT_MASK(EV_KEY) },
911 .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) },
912 }, /* Avoid tablets, digitisers and similar devices */
913 { } /* Terminating entry */
914 };
915
916 static const struct input_device_id joydev_ids[] = {
917 {
918 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
919 INPUT_DEVICE_ID_MATCH_ABSBIT,
920 .evbit = { BIT_MASK(EV_ABS) },
921 .absbit = { BIT_MASK(ABS_X) },
922 },
923 {
924 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
925 INPUT_DEVICE_ID_MATCH_ABSBIT,
926 .evbit = { BIT_MASK(EV_ABS) },
927 .absbit = { BIT_MASK(ABS_WHEEL) },
928 },
929 {
930 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
931 INPUT_DEVICE_ID_MATCH_ABSBIT,
932 .evbit = { BIT_MASK(EV_ABS) },
933 .absbit = { BIT_MASK(ABS_THROTTLE) },
934 },
935 { } /* Terminating entry */
936 };
937
938 MODULE_DEVICE_TABLE(input, joydev_ids);
939
940 static struct input_handler joydev_handler = {
941 .event = joydev_event,
942 .connect = joydev_connect,
943 .disconnect = joydev_disconnect,
944 .fops = &joydev_fops,
945 .minor = JOYDEV_MINOR_BASE,
946 .name = "joydev",
947 .id_table = joydev_ids,
948 .blacklist = joydev_blacklist,
949 };
950
951 static int __init joydev_init(void)
952 {
953 return input_register_handler(&joydev_handler);
954 }
955
956 static void __exit joydev_exit(void)
957 {
958 input_unregister_handler(&joydev_handler);
959 }
960
961 module_init(joydev_init);
962 module_exit(joydev_exit);
Linux with added FPC-III support