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dlm: Handle application limited situations properly.
[linux-2.6.git] / drivers / input / joydev.c
blob9d424cebfd2c7d6e31e3cd433342e94f6fc7625c
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 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 bool exist;
49
50 struct js_corr corr[ABS_CNT];
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_CNT];
57 __u8 abspam[ABS_CNT];
58 __s16 abs[ABS_CNT];
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 for (i = 0; i < joydev->nabs; i++)
487 joydev->absmap[joydev->abspam[i]] = i;
488
489 out:
490 kfree(abspam);
491 return retval;
492 }
493
494 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
495 void __user *argp, size_t len)
496 {
497 __u16 *keypam;
498 int i;
499 int retval = 0;
500
501 len = min(len, sizeof(joydev->keypam));
502
503 /* Validate the map. */
504 keypam = kmalloc(len, GFP_KERNEL);
505 if (!keypam)
506 return -ENOMEM;
507
508 if (copy_from_user(keypam, argp, len)) {
509 retval = -EFAULT;
510 goto out;
511 }
512
513 for (i = 0; i < joydev->nkey; i++) {
514 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
515 retval = -EINVAL;
516 goto out;
517 }
518 }
519
520 memcpy(joydev->keypam, keypam, len);
521
522 for (i = 0; i < joydev->nkey; i++)
523 joydev->keymap[keypam[i] - BTN_MISC] = i;
524
525 out:
526 kfree(keypam);
527 return retval;
528 }
529
530
531 static int joydev_ioctl_common(struct joydev *joydev,
532 unsigned int cmd, void __user *argp)
533 {
534 struct input_dev *dev = joydev->handle.dev;
535 size_t len;
536 int i;
537 const char *name;
538
539 /* Process fixed-sized commands. */
540 switch (cmd) {
541
542 case JS_SET_CAL:
543 return copy_from_user(&joydev->glue.JS_CORR, argp,
544 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
545
546 case JS_GET_CAL:
547 return copy_to_user(argp, &joydev->glue.JS_CORR,
548 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
549
550 case JS_SET_TIMEOUT:
551 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
552
553 case JS_GET_TIMEOUT:
554 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
555
556 case JSIOCGVERSION:
557 return put_user(JS_VERSION, (__u32 __user *) argp);
558
559 case JSIOCGAXES:
560 return put_user(joydev->nabs, (__u8 __user *) argp);
561
562 case JSIOCGBUTTONS:
563 return put_user(joydev->nkey, (__u8 __user *) argp);
564
565 case JSIOCSCORR:
566 if (copy_from_user(joydev->corr, argp,
567 sizeof(joydev->corr[0]) * joydev->nabs))
568 return -EFAULT;
569
570 for (i = 0; i < joydev->nabs; i++) {
571 int val = input_abs_get_val(dev, joydev->abspam[i]);
572 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
573 }
574 return 0;
575
576 case JSIOCGCORR:
577 return copy_to_user(argp, joydev->corr,
578 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
579
580 }
581
582 /*
583 * Process variable-sized commands (the axis and button map commands
584 * are considered variable-sized to decouple them from the values of
585 * ABS_MAX and KEY_MAX).
586 */
587 switch (cmd & ~IOCSIZE_MASK) {
588
589 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
590 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
591
592 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
593 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
594 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
595
596 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
597 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
598
599 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
600 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
601 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
602
603 case JSIOCGNAME(0):
604 name = dev->name;
605 if (!name)
606 return 0;
607
608 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
609 return copy_to_user(argp, name, len) ? -EFAULT : len;
610 }
611
612 return -EINVAL;
613 }
614
615 #ifdef CONFIG_COMPAT
616 static long joydev_compat_ioctl(struct file *file,
617 unsigned int cmd, unsigned long arg)
618 {
619 struct joydev_client *client = file->private_data;
620 struct joydev *joydev = client->joydev;
621 void __user *argp = (void __user *)arg;
622 s32 tmp32;
623 struct JS_DATA_SAVE_TYPE_32 ds32;
624 int retval;
625
626 retval = mutex_lock_interruptible(&joydev->mutex);
627 if (retval)
628 return retval;
629
630 if (!joydev->exist) {
631 retval = -ENODEV;
632 goto out;
633 }
634
635 switch (cmd) {
636
637 case JS_SET_TIMELIMIT:
638 retval = get_user(tmp32, (s32 __user *) arg);
639 if (retval == 0)
640 joydev->glue.JS_TIMELIMIT = tmp32;
641 break;
642
643 case JS_GET_TIMELIMIT:
644 tmp32 = joydev->glue.JS_TIMELIMIT;
645 retval = put_user(tmp32, (s32 __user *) arg);
646 break;
647
648 case JS_SET_ALL:
649 retval = copy_from_user(&ds32, argp,
650 sizeof(ds32)) ? -EFAULT : 0;
651 if (retval == 0) {
652 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
653 joydev->glue.BUSY = ds32.BUSY;
654 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
655 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
656 joydev->glue.JS_SAVE = ds32.JS_SAVE;
657 joydev->glue.JS_CORR = ds32.JS_CORR;
658 }
659 break;
660
661 case JS_GET_ALL:
662 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
663 ds32.BUSY = joydev->glue.BUSY;
664 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
665 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
666 ds32.JS_SAVE = joydev->glue.JS_SAVE;
667 ds32.JS_CORR = joydev->glue.JS_CORR;
668
669 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
670 break;
671
672 default:
673 retval = joydev_ioctl_common(joydev, cmd, argp);
674 break;
675 }
676
677 out:
678 mutex_unlock(&joydev->mutex);
679 return retval;
680 }
681 #endif /* CONFIG_COMPAT */
682
683 static long joydev_ioctl(struct file *file,
684 unsigned int cmd, unsigned long arg)
685 {
686 struct joydev_client *client = file->private_data;
687 struct joydev *joydev = client->joydev;
688 void __user *argp = (void __user *)arg;
689 int retval;
690
691 retval = mutex_lock_interruptible(&joydev->mutex);
692 if (retval)
693 return retval;
694
695 if (!joydev->exist) {
696 retval = -ENODEV;
697 goto out;
698 }
699
700 switch (cmd) {
701
702 case JS_SET_TIMELIMIT:
703 retval = get_user(joydev->glue.JS_TIMELIMIT,
704 (long __user *) arg);
705 break;
706
707 case JS_GET_TIMELIMIT:
708 retval = put_user(joydev->glue.JS_TIMELIMIT,
709 (long __user *) arg);
710 break;
711
712 case JS_SET_ALL:
713 retval = copy_from_user(&joydev->glue, argp,
714 sizeof(joydev->glue)) ? -EFAULT: 0;
715 break;
716
717 case JS_GET_ALL:
718 retval = copy_to_user(argp, &joydev->glue,
719 sizeof(joydev->glue)) ? -EFAULT : 0;
720 break;
721
722 default:
723 retval = joydev_ioctl_common(joydev, cmd, argp);
724 break;
725 }
726 out:
727 mutex_unlock(&joydev->mutex);
728 return retval;
729 }
730
731 static const struct file_operations joydev_fops = {
732 .owner = THIS_MODULE,
733 .read = joydev_read,
734 .poll = joydev_poll,
735 .open = joydev_open,
736 .release = joydev_release,
737 .unlocked_ioctl = joydev_ioctl,
738 #ifdef CONFIG_COMPAT
739 .compat_ioctl = joydev_compat_ioctl,
740 #endif
741 .fasync = joydev_fasync,
742 .llseek = no_llseek,
743 };
744
745 static int joydev_install_chrdev(struct joydev *joydev)
746 {
747 joydev_table[joydev->minor] = joydev;
748 return 0;
749 }
750
751 static void joydev_remove_chrdev(struct joydev *joydev)
752 {
753 mutex_lock(&joydev_table_mutex);
754 joydev_table[joydev->minor] = NULL;
755 mutex_unlock(&joydev_table_mutex);
756 }
757
758 /*
759 * Mark device non-existant. This disables writes, ioctls and
760 * prevents new users from opening the device. Already posted
761 * blocking reads will stay, however new ones will fail.
762 */
763 static void joydev_mark_dead(struct joydev *joydev)
764 {
765 mutex_lock(&joydev->mutex);
766 joydev->exist = false;
767 mutex_unlock(&joydev->mutex);
768 }
769
770 static void joydev_cleanup(struct joydev *joydev)
771 {
772 struct input_handle *handle = &joydev->handle;
773
774 joydev_mark_dead(joydev);
775 joydev_hangup(joydev);
776 joydev_remove_chrdev(joydev);
777
778 /* joydev is marked dead so noone else accesses joydev->open */
779 if (joydev->open)
780 input_close_device(handle);
781 }
782
783
784 static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
785 {
786 /* Avoid touchpads and touchscreens */
787 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
788 return false;
789
790 /* Avoid tablets, digitisers and similar devices */
791 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit))
792 return false;
793
794 return true;
795 }
796
797 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
798 const struct input_device_id *id)
799 {
800 struct joydev *joydev;
801 int i, j, t, minor;
802 int error;
803
804 for (minor = 0; minor < JOYDEV_MINORS; minor++)
805 if (!joydev_table[minor])
806 break;
807
808 if (minor == JOYDEV_MINORS) {
809 printk(KERN_ERR "joydev: no more free joydev devices\n");
810 return -ENFILE;
811 }
812
813 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
814 if (!joydev)
815 return -ENOMEM;
816
817 INIT_LIST_HEAD(&joydev->client_list);
818 spin_lock_init(&joydev->client_lock);
819 mutex_init(&joydev->mutex);
820 init_waitqueue_head(&joydev->wait);
821
822 dev_set_name(&joydev->dev, "js%d", minor);
823 joydev->exist = true;
824 joydev->minor = minor;
825
826 joydev->handle.dev = input_get_device(dev);
827 joydev->handle.name = dev_name(&joydev->dev);
828 joydev->handle.handler = handler;
829 joydev->handle.private = joydev;
830
831 for (i = 0; i < ABS_CNT; i++)
832 if (test_bit(i, dev->absbit)) {
833 joydev->absmap[i] = joydev->nabs;
834 joydev->abspam[joydev->nabs] = i;
835 joydev->nabs++;
836 }
837
838 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
839 if (test_bit(i + BTN_MISC, dev->keybit)) {
840 joydev->keymap[i] = joydev->nkey;
841 joydev->keypam[joydev->nkey] = i + BTN_MISC;
842 joydev->nkey++;
843 }
844
845 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
846 if (test_bit(i + BTN_MISC, dev->keybit)) {
847 joydev->keymap[i] = joydev->nkey;
848 joydev->keypam[joydev->nkey] = i + BTN_MISC;
849 joydev->nkey++;
850 }
851
852 for (i = 0; i < joydev->nabs; i++) {
853 j = joydev->abspam[i];
854 if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
855 joydev->corr[i].type = JS_CORR_NONE;
856 joydev->abs[i] = input_abs_get_val(dev, j);
857 continue;
858 }
859 joydev->corr[i].type = JS_CORR_BROKEN;
860 joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
861
862 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
863 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
864 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
865
866 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
867 - 2 * input_abs_get_flat(dev, j);
868 if (t) {
869 joydev->corr[i].coef[2] = (1 << 29) / t;
870 joydev->corr[i].coef[3] = (1 << 29) / t;
871
872 joydev->abs[i] =
873 joydev_correct(input_abs_get_val(dev, j),
874 joydev->corr + i);
875 }
876 }
877
878 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
879 joydev->dev.class = &input_class;
880 joydev->dev.parent = &dev->dev;
881 joydev->dev.release = joydev_free;
882 device_initialize(&joydev->dev);
883
884 error = input_register_handle(&joydev->handle);
885 if (error)
886 goto err_free_joydev;
887
888 error = joydev_install_chrdev(joydev);
889 if (error)
890 goto err_unregister_handle;
891
892 error = device_add(&joydev->dev);
893 if (error)
894 goto err_cleanup_joydev;
895
896 return 0;
897
898 err_cleanup_joydev:
899 joydev_cleanup(joydev);
900 err_unregister_handle:
901 input_unregister_handle(&joydev->handle);
902 err_free_joydev:
903 put_device(&joydev->dev);
904 return error;
905 }
906
907 static void joydev_disconnect(struct input_handle *handle)
908 {
909 struct joydev *joydev = handle->private;
910
911 device_del(&joydev->dev);
912 joydev_cleanup(joydev);
913 input_unregister_handle(handle);
914 put_device(&joydev->dev);
915 }
916
917 static const struct input_device_id joydev_ids[] = {
918 {
919 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
920 INPUT_DEVICE_ID_MATCH_ABSBIT,
921 .evbit = { BIT_MASK(EV_ABS) },
922 .absbit = { BIT_MASK(ABS_X) },
923 },
924 {
925 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
926 INPUT_DEVICE_ID_MATCH_ABSBIT,
927 .evbit = { BIT_MASK(EV_ABS) },
928 .absbit = { BIT_MASK(ABS_WHEEL) },
929 },
930 {
931 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
932 INPUT_DEVICE_ID_MATCH_ABSBIT,
933 .evbit = { BIT_MASK(EV_ABS) },
934 .absbit = { BIT_MASK(ABS_THROTTLE) },
935 },
936 {
937 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
938 INPUT_DEVICE_ID_MATCH_KEYBIT,
939 .evbit = { BIT_MASK(EV_KEY) },
940 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
941 },
942 {
943 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
944 INPUT_DEVICE_ID_MATCH_KEYBIT,
945 .evbit = { BIT_MASK(EV_KEY) },
946 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
947 },
948 {
949 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
950 INPUT_DEVICE_ID_MATCH_KEYBIT,
951 .evbit = { BIT_MASK(EV_KEY) },
952 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
953 },
954 { } /* Terminating entry */
955 };
956
957 MODULE_DEVICE_TABLE(input, joydev_ids);
958
959 static struct input_handler joydev_handler = {
960 .event = joydev_event,
961 .match = joydev_match,
962 .connect = joydev_connect,
963 .disconnect = joydev_disconnect,
964 .fops = &joydev_fops,
965 .minor = JOYDEV_MINOR_BASE,
966 .name = "joydev",
967 .id_table = joydev_ids,
968 };
969
970 static int __init joydev_init(void)
971 {
972 return input_register_handler(&joydev_handler);
973 }
974
975 static void __exit joydev_exit(void)
976 {
977 input_unregister_handler(&joydev_handler);
978 }
979
980 module_init(joydev_init);
981 module_exit(joydev_exit);
Linus' kernel tree