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Merge branch 'mini2440-dev-unlikely' into mini2440-dev
[linux-2.6/mini2440.git] / drivers / input / joydev.c
blobb1bd6dd322864d0bd04c2f9a48c9f80b3217dcce
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 out:
485 kfree(abspam);
486 return retval;
487 }
488
489 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
490 void __user *argp, size_t len)
491 {
492 __u16 *keypam;
493 int i;
494 int retval = 0;
495
496 len = min(len, sizeof(joydev->keypam));
497
498 /* Validate the map. */
499 keypam = kmalloc(len, GFP_KERNEL);
500 if (!keypam)
501 return -ENOMEM;
502
503 if (copy_from_user(keypam, argp, len)) {
504 retval = -EFAULT;
505 goto out;
506 }
507
508 for (i = 0; i < joydev->nkey; i++) {
509 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
510 retval = -EINVAL;
511 goto out;
512 }
513 }
514
515 memcpy(joydev->keypam, keypam, len);
516
517 for (i = 0; i < joydev->nkey; i++)
518 joydev->keymap[keypam[i] - BTN_MISC] = i;
519
520 out:
521 kfree(keypam);
522 return retval;
523 }
524
525
526 static int joydev_ioctl_common(struct joydev *joydev,
527 unsigned int cmd, void __user *argp)
528 {
529 struct input_dev *dev = joydev->handle.dev;
530 size_t len;
531 int i, j;
532 const char *name;
533
534 /* Process fixed-sized commands. */
535 switch (cmd) {
536
537 case JS_SET_CAL:
538 return copy_from_user(&joydev->glue.JS_CORR, argp,
539 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
540
541 case JS_GET_CAL:
542 return copy_to_user(argp, &joydev->glue.JS_CORR,
543 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
544
545 case JS_SET_TIMEOUT:
546 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
547
548 case JS_GET_TIMEOUT:
549 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
550
551 case JSIOCGVERSION:
552 return put_user(JS_VERSION, (__u32 __user *) argp);
553
554 case JSIOCGAXES:
555 return put_user(joydev->nabs, (__u8 __user *) argp);
556
557 case JSIOCGBUTTONS:
558 return put_user(joydev->nkey, (__u8 __user *) argp);
559
560 case JSIOCSCORR:
561 if (copy_from_user(joydev->corr, argp,
562 sizeof(joydev->corr[0]) * joydev->nabs))
563 return -EFAULT;
564
565 for (i = 0; i < joydev->nabs; i++) {
566 j = joydev->abspam[i];
567 joydev->abs[i] = joydev_correct(dev->abs[j],
568 &joydev->corr[i]);
569 }
570 return 0;
571
572 case JSIOCGCORR:
573 return copy_to_user(argp, joydev->corr,
574 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
575
576 }
577
578 /*
579 * Process variable-sized commands (the axis and button map commands
580 * are considered variable-sized to decouple them from the values of
581 * ABS_MAX and KEY_MAX).
582 */
583 switch (cmd & ~IOCSIZE_MASK) {
584
585 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
586 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
587
588 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
589 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
590 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
591
592 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
593 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
594
595 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
596 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
597 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
598
599 case JSIOCGNAME(0):
600 name = dev->name;
601 if (!name)
602 return 0;
603
604 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
605 return copy_to_user(argp, name, len) ? -EFAULT : len;
606 }
607
608 return -EINVAL;
609 }
610
611 #ifdef CONFIG_COMPAT
612 static long joydev_compat_ioctl(struct file *file,
613 unsigned int cmd, unsigned long arg)
614 {
615 struct joydev_client *client = file->private_data;
616 struct joydev *joydev = client->joydev;
617 void __user *argp = (void __user *)arg;
618 s32 tmp32;
619 struct JS_DATA_SAVE_TYPE_32 ds32;
620 int retval;
621
622 retval = mutex_lock_interruptible(&joydev->mutex);
623 if (retval)
624 return retval;
625
626 if (!joydev->exist) {
627 retval = -ENODEV;
628 goto out;
629 }
630
631 switch (cmd) {
632
633 case JS_SET_TIMELIMIT:
634 retval = get_user(tmp32, (s32 __user *) arg);
635 if (retval == 0)
636 joydev->glue.JS_TIMELIMIT = tmp32;
637 break;
638
639 case JS_GET_TIMELIMIT:
640 tmp32 = joydev->glue.JS_TIMELIMIT;
641 retval = put_user(tmp32, (s32 __user *) arg);
642 break;
643
644 case JS_SET_ALL:
645 retval = copy_from_user(&ds32, argp,
646 sizeof(ds32)) ? -EFAULT : 0;
647 if (retval == 0) {
648 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
649 joydev->glue.BUSY = ds32.BUSY;
650 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
651 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
652 joydev->glue.JS_SAVE = ds32.JS_SAVE;
653 joydev->glue.JS_CORR = ds32.JS_CORR;
654 }
655 break;
656
657 case JS_GET_ALL:
658 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
659 ds32.BUSY = joydev->glue.BUSY;
660 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
661 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
662 ds32.JS_SAVE = joydev->glue.JS_SAVE;
663 ds32.JS_CORR = joydev->glue.JS_CORR;
664
665 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
666 break;
667
668 default:
669 retval = joydev_ioctl_common(joydev, cmd, argp);
670 break;
671 }
672
673 out:
674 mutex_unlock(&joydev->mutex);
675 return retval;
676 }
677 #endif /* CONFIG_COMPAT */
678
679 static long joydev_ioctl(struct file *file,
680 unsigned int cmd, unsigned long arg)
681 {
682 struct joydev_client *client = file->private_data;
683 struct joydev *joydev = client->joydev;
684 void __user *argp = (void __user *)arg;
685 int retval;
686
687 retval = mutex_lock_interruptible(&joydev->mutex);
688 if (retval)
689 return retval;
690
691 if (!joydev->exist) {
692 retval = -ENODEV;
693 goto out;
694 }
695
696 switch (cmd) {
697
698 case JS_SET_TIMELIMIT:
699 retval = get_user(joydev->glue.JS_TIMELIMIT,
700 (long __user *) arg);
701 break;
702
703 case JS_GET_TIMELIMIT:
704 retval = put_user(joydev->glue.JS_TIMELIMIT,
705 (long __user *) arg);
706 break;
707
708 case JS_SET_ALL:
709 retval = copy_from_user(&joydev->glue, argp,
710 sizeof(joydev->glue)) ? -EFAULT: 0;
711 break;
712
713 case JS_GET_ALL:
714 retval = copy_to_user(argp, &joydev->glue,
715 sizeof(joydev->glue)) ? -EFAULT : 0;
716 break;
717
718 default:
719 retval = joydev_ioctl_common(joydev, cmd, argp);
720 break;
721 }
722 out:
723 mutex_unlock(&joydev->mutex);
724 return retval;
725 }
726
727 static const struct file_operations joydev_fops = {
728 .owner = THIS_MODULE,
729 .read = joydev_read,
730 .poll = joydev_poll,
731 .open = joydev_open,
732 .release = joydev_release,
733 .unlocked_ioctl = joydev_ioctl,
734 #ifdef CONFIG_COMPAT
735 .compat_ioctl = joydev_compat_ioctl,
736 #endif
737 .fasync = joydev_fasync,
738 };
739
740 static int joydev_install_chrdev(struct joydev *joydev)
741 {
742 joydev_table[joydev->minor] = joydev;
743 return 0;
744 }
745
746 static void joydev_remove_chrdev(struct joydev *joydev)
747 {
748 mutex_lock(&joydev_table_mutex);
749 joydev_table[joydev->minor] = NULL;
750 mutex_unlock(&joydev_table_mutex);
751 }
752
753 /*
754 * Mark device non-existant. This disables writes, ioctls and
755 * prevents new users from opening the device. Already posted
756 * blocking reads will stay, however new ones will fail.
757 */
758 static void joydev_mark_dead(struct joydev *joydev)
759 {
760 mutex_lock(&joydev->mutex);
761 joydev->exist = 0;
762 mutex_unlock(&joydev->mutex);
763 }
764
765 static void joydev_cleanup(struct joydev *joydev)
766 {
767 struct input_handle *handle = &joydev->handle;
768
769 joydev_mark_dead(joydev);
770 joydev_hangup(joydev);
771 joydev_remove_chrdev(joydev);
772
773 /* joydev is marked dead so noone else accesses joydev->open */
774 if (joydev->open)
775 input_close_device(handle);
776 }
777
778 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
779 const struct input_device_id *id)
780 {
781 struct joydev *joydev;
782 int i, j, t, minor;
783 int error;
784
785 for (minor = 0; minor < JOYDEV_MINORS; minor++)
786 if (!joydev_table[minor])
787 break;
788
789 if (minor == JOYDEV_MINORS) {
790 printk(KERN_ERR "joydev: no more free joydev devices\n");
791 return -ENFILE;
792 }
793
794 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
795 if (!joydev)
796 return -ENOMEM;
797
798 INIT_LIST_HEAD(&joydev->client_list);
799 spin_lock_init(&joydev->client_lock);
800 mutex_init(&joydev->mutex);
801 init_waitqueue_head(&joydev->wait);
802
803 dev_set_name(&joydev->dev, "js%d", minor);
804 joydev->exist = 1;
805 joydev->minor = minor;
806
807 joydev->exist = 1;
808 joydev->handle.dev = input_get_device(dev);
809 joydev->handle.name = dev_name(&joydev->dev);
810 joydev->handle.handler = handler;
811 joydev->handle.private = joydev;
812
813 for (i = 0; i < ABS_MAX + 1; i++)
814 if (test_bit(i, dev->absbit)) {
815 joydev->absmap[i] = joydev->nabs;
816 joydev->abspam[joydev->nabs] = i;
817 joydev->nabs++;
818 }
819
820 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
821 if (test_bit(i + BTN_MISC, dev->keybit)) {
822 joydev->keymap[i] = joydev->nkey;
823 joydev->keypam[joydev->nkey] = i + BTN_MISC;
824 joydev->nkey++;
825 }
826
827 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
828 if (test_bit(i + BTN_MISC, dev->keybit)) {
829 joydev->keymap[i] = joydev->nkey;
830 joydev->keypam[joydev->nkey] = i + BTN_MISC;
831 joydev->nkey++;
832 }
833
834 for (i = 0; i < joydev->nabs; i++) {
835 j = joydev->abspam[i];
836 if (dev->absmax[j] == dev->absmin[j]) {
837 joydev->corr[i].type = JS_CORR_NONE;
838 joydev->abs[i] = dev->abs[j];
839 continue;
840 }
841 joydev->corr[i].type = JS_CORR_BROKEN;
842 joydev->corr[i].prec = dev->absfuzz[j];
843 joydev->corr[i].coef[0] =
844 (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
845 joydev->corr[i].coef[1] =
846 (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
847
848 t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
849 if (t) {
850 joydev->corr[i].coef[2] = (1 << 29) / t;
851 joydev->corr[i].coef[3] = (1 << 29) / t;
852
853 joydev->abs[i] = joydev_correct(dev->abs[j],
854 joydev->corr + i);
855 }
856 }
857
858 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
859 joydev->dev.class = &input_class;
860 joydev->dev.parent = &dev->dev;
861 joydev->dev.release = joydev_free;
862 device_initialize(&joydev->dev);
863
864 error = input_register_handle(&joydev->handle);
865 if (error)
866 goto err_free_joydev;
867
868 error = joydev_install_chrdev(joydev);
869 if (error)
870 goto err_unregister_handle;
871
872 error = device_add(&joydev->dev);
873 if (error)
874 goto err_cleanup_joydev;
875
876 return 0;
877
878 err_cleanup_joydev:
879 joydev_cleanup(joydev);
880 err_unregister_handle:
881 input_unregister_handle(&joydev->handle);
882 err_free_joydev:
883 put_device(&joydev->dev);
884 return error;
885 }
886
887 static void joydev_disconnect(struct input_handle *handle)
888 {
889 struct joydev *joydev = handle->private;
890
891 device_del(&joydev->dev);
892 joydev_cleanup(joydev);
893 input_unregister_handle(handle);
894 put_device(&joydev->dev);
895 }
896
897 static const struct input_device_id joydev_blacklist[] = {
898 {
899 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
900 INPUT_DEVICE_ID_MATCH_KEYBIT,
901 .evbit = { BIT_MASK(EV_KEY) },
902 .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) },
903 }, /* Avoid itouchpads and touchscreens */
904 {
905 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
906 INPUT_DEVICE_ID_MATCH_KEYBIT,
907 .evbit = { BIT_MASK(EV_KEY) },
908 .keybit = { [BIT_WORD(BTN_DIGI)] = BIT_MASK(BTN_DIGI) },
909 }, /* Avoid tablets, digitisers and similar devices */
910 { } /* Terminating entry */
911 };
912
913 static const struct input_device_id joydev_ids[] = {
914 {
915 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
916 INPUT_DEVICE_ID_MATCH_ABSBIT,
917 .evbit = { BIT_MASK(EV_ABS) },
918 .absbit = { BIT_MASK(ABS_X) },
919 },
920 {
921 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
922 INPUT_DEVICE_ID_MATCH_ABSBIT,
923 .evbit = { BIT_MASK(EV_ABS) },
924 .absbit = { BIT_MASK(ABS_WHEEL) },
925 },
926 {
927 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
928 INPUT_DEVICE_ID_MATCH_ABSBIT,
929 .evbit = { BIT_MASK(EV_ABS) },
930 .absbit = { BIT_MASK(ABS_THROTTLE) },
931 },
932 { } /* Terminating entry */
933 };
934
935 MODULE_DEVICE_TABLE(input, joydev_ids);
936
937 static struct input_handler joydev_handler = {
938 .event = joydev_event,
939 .connect = joydev_connect,
940 .disconnect = joydev_disconnect,
941 .fops = &joydev_fops,
942 .minor = JOYDEV_MINOR_BASE,
943 .name = "joydev",
944 .id_table = joydev_ids,
945 .blacklist = joydev_blacklist,
946 };
947
948 static int __init joydev_init(void)
949 {
950 return input_register_handler(&joydev_handler);
951 }
952
953 static void __exit joydev_exit(void)
954 {
955 input_unregister_handler(&joydev_handler);
956 }
957
958 module_init(joydev_init);
959 module_exit(joydev_exit);
Support for the Chinese Samsung S3C2440 based development boards