projects/linux·blob v3.2 · refs

982 lines · 22.6 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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <asm/io.h>
16#include <asm/system.h>
17#include <linux/delay.h>
18#include <linux/errno.h>
19#include <linux/joystick.h>
20#include <linux/input.h>
21#include <linux/kernel.h>
22#include <linux/major.h>
23#include <linux/sched.h>
24#include <linux/slab.h>
25#include <linux/mm.h>
26#include <linux/miscdevice.h>
27#include <linux/module.h>
28#include <linux/poll.h>
29#include <linux/init.h>
30#include <linux/device.h>
31
32MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
33MODULE_DESCRIPTION("Joystick device interfaces");
34MODULE_SUPPORTED_DEVICE("input/js");
35MODULE_LICENSE("GPL");
36
37#define JOYDEV_MINOR_BASE 0
38#define JOYDEV_MINORS 16
39#define JOYDEV_BUFFER_SIZE 64
40
41struct joydev {
42 int open;
43 int minor;
44 struct input_handle handle;
45 wait_queue_head_t wait;
46 struct list_head client_list;
47 spinlock_t client_lock; /* protects client_list */
48 struct mutex mutex;
49 struct device dev;
50 bool exist;
51
52 struct js_corr corr[ABS_CNT];
53 struct JS_DATA_SAVE_TYPE glue;
54 int nabs;
55 int nkey;
56 __u16 keymap[KEY_MAX - BTN_MISC + 1];
57 __u16 keypam[KEY_MAX - BTN_MISC + 1];
58 __u8 absmap[ABS_CNT];
59 __u8 abspam[ABS_CNT];
60 __s16 abs[ABS_CNT];
61};
62
63struct joydev_client {
64 struct js_event buffer[JOYDEV_BUFFER_SIZE];
65 int head;
66 int tail;
67 int startup;
68 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
69 struct fasync_struct *fasync;
70 struct joydev *joydev;
71 struct list_head node;
72};
73
74static struct joydev *joydev_table[JOYDEV_MINORS];
75static DEFINE_MUTEX(joydev_table_mutex);
76
77static int joydev_correct(int value, struct js_corr *corr)
78{
79 switch (corr->type) {
80
81 case JS_CORR_NONE:
82 break;
83
84 case JS_CORR_BROKEN:
85 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
86 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
87 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
88 break;
89
90 default:
91 return 0;
92 }
93
94 return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
95}
96
97static void joydev_pass_event(struct joydev_client *client,
98 struct js_event *event)
99{
100 struct joydev *joydev = client->joydev;
101
102 /*
103 * IRQs already disabled, just acquire the lock
104 */
105 spin_lock(&client->buffer_lock);
106
107 client->buffer[client->head] = *event;
108
109 if (client->startup == joydev->nabs + joydev->nkey) {
110 client->head++;
111 client->head &= JOYDEV_BUFFER_SIZE - 1;
112 if (client->tail == client->head)
113 client->startup = 0;
114 }
115
116 spin_unlock(&client->buffer_lock);
117
118 kill_fasync(&client->fasync, SIGIO, POLL_IN);
119}
120
121static void joydev_event(struct input_handle *handle,
122 unsigned int type, unsigned int code, int value)
123{
124 struct joydev *joydev = handle->private;
125 struct joydev_client *client;
126 struct js_event event;
127
128 switch (type) {
129
130 case EV_KEY:
131 if (code < BTN_MISC || value == 2)
132 return;
133 event.type = JS_EVENT_BUTTON;
134 event.number = joydev->keymap[code - BTN_MISC];
135 event.value = value;
136 break;
137
138 case EV_ABS:
139 event.type = JS_EVENT_AXIS;
140 event.number = joydev->absmap[code];
141 event.value = joydev_correct(value,
142 &joydev->corr[event.number]);
143 if (event.value == joydev->abs[event.number])
144 return;
145 joydev->abs[event.number] = event.value;
146 break;
147
148 default:
149 return;
150 }
151
152 event.time = jiffies_to_msecs(jiffies);
153
154 rcu_read_lock();
155 list_for_each_entry_rcu(client, &joydev->client_list, node)
156 joydev_pass_event(client, &event);
157 rcu_read_unlock();
158
159 wake_up_interruptible(&joydev->wait);
160}
161
162static int joydev_fasync(int fd, struct file *file, int on)
163{
164 struct joydev_client *client = file->private_data;
165
166 return fasync_helper(fd, file, on, &client->fasync);
167}
168
169static void joydev_free(struct device *dev)
170{
171 struct joydev *joydev = container_of(dev, struct joydev, dev);
172
173 input_put_device(joydev->handle.dev);
174 kfree(joydev);
175}
176
177static void joydev_attach_client(struct joydev *joydev,
178 struct joydev_client *client)
179{
180 spin_lock(&joydev->client_lock);
181 list_add_tail_rcu(&client->node, &joydev->client_list);
182 spin_unlock(&joydev->client_lock);
183}
184
185static void joydev_detach_client(struct joydev *joydev,
186 struct joydev_client *client)
187{
188 spin_lock(&joydev->client_lock);
189 list_del_rcu(&client->node);
190 spin_unlock(&joydev->client_lock);
191 synchronize_rcu();
192}
193
194static int joydev_open_device(struct joydev *joydev)
195{
196 int retval;
197
198 retval = mutex_lock_interruptible(&joydev->mutex);
199 if (retval)
200 return retval;
201
202 if (!joydev->exist)
203 retval = -ENODEV;
204 else if (!joydev->open++) {
205 retval = input_open_device(&joydev->handle);
206 if (retval)
207 joydev->open--;
208 }
209
210 mutex_unlock(&joydev->mutex);
211 return retval;
212}
213
214static void joydev_close_device(struct joydev *joydev)
215{
216 mutex_lock(&joydev->mutex);
217
218 if (joydev->exist && !--joydev->open)
219 input_close_device(&joydev->handle);
220
221 mutex_unlock(&joydev->mutex);
222}
223
224/*
225 * Wake up users waiting for IO so they can disconnect from
226 * dead device.
227 */
228static void joydev_hangup(struct joydev *joydev)
229{
230 struct joydev_client *client;
231
232 spin_lock(&joydev->client_lock);
233 list_for_each_entry(client, &joydev->client_list, node)
234 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
235 spin_unlock(&joydev->client_lock);
236
237 wake_up_interruptible(&joydev->wait);
238}
239
240static int joydev_release(struct inode *inode, struct file *file)
241{
242 struct joydev_client *client = file->private_data;
243 struct joydev *joydev = client->joydev;
244
245 joydev_detach_client(joydev, client);
246 kfree(client);
247
248 joydev_close_device(joydev);
249 put_device(&joydev->dev);
250
251 return 0;
252}
253
254static int joydev_open(struct inode *inode, struct file *file)
255{
256 struct joydev_client *client;
257 struct joydev *joydev;
258 int i = iminor(inode) - JOYDEV_MINOR_BASE;
259 int error;
260
261 if (i >= JOYDEV_MINORS)
262 return -ENODEV;
263
264 error = mutex_lock_interruptible(&joydev_table_mutex);
265 if (error)
266 return error;
267 joydev = joydev_table[i];
268 if (joydev)
269 get_device(&joydev->dev);
270 mutex_unlock(&joydev_table_mutex);
271
272 if (!joydev)
273 return -ENODEV;
274
275 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
276 if (!client) {
277 error = -ENOMEM;
278 goto err_put_joydev;
279 }
280
281 spin_lock_init(&client->buffer_lock);
282 client->joydev = joydev;
283 joydev_attach_client(joydev, client);
284
285 error = joydev_open_device(joydev);
286 if (error)
287 goto err_free_client;
288
289 file->private_data = client;
290 nonseekable_open(inode, file);
291
292 return 0;
293
294 err_free_client:
295 joydev_detach_client(joydev, client);
296 kfree(client);
297 err_put_joydev:
298 put_device(&joydev->dev);
299 return error;
300}
301
302static int joydev_generate_startup_event(struct joydev_client *client,
303 struct input_dev *input,
304 struct js_event *event)
305{
306 struct joydev *joydev = client->joydev;
307 int have_event;
308
309 spin_lock_irq(&client->buffer_lock);
310
311 have_event = client->startup < joydev->nabs + joydev->nkey;
312
313 if (have_event) {
314
315 event->time = jiffies_to_msecs(jiffies);
316 if (client->startup < joydev->nkey) {
317 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
318 event->number = client->startup;
319 event->value = !!test_bit(joydev->keypam[event->number],
320 input->key);
321 } else {
322 event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
323 event->number = client->startup - joydev->nkey;
324 event->value = joydev->abs[event->number];
325 }
326 client->startup++;
327 }
328
329 spin_unlock_irq(&client->buffer_lock);
330
331 return have_event;
332}
333
334static int joydev_fetch_next_event(struct joydev_client *client,
335 struct js_event *event)
336{
337 int have_event;
338
339 spin_lock_irq(&client->buffer_lock);
340
341 have_event = client->head != client->tail;
342 if (have_event) {
343 *event = client->buffer[client->tail++];
344 client->tail &= JOYDEV_BUFFER_SIZE - 1;
345 }
346
347 spin_unlock_irq(&client->buffer_lock);
348
349 return have_event;
350}
351
352/*
353 * Old joystick interface
354 */
355static ssize_t joydev_0x_read(struct joydev_client *client,
356 struct input_dev *input,
357 char __user *buf)
358{
359 struct joydev *joydev = client->joydev;
360 struct JS_DATA_TYPE data;
361 int i;
362
363 spin_lock_irq(&input->event_lock);
364
365 /*
366 * Get device state
367 */
368 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
369 data.buttons |=
370 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
371 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
372 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
373
374 /*
375 * Reset reader's event queue
376 */
377 spin_lock(&client->buffer_lock);
378 client->startup = 0;
379 client->tail = client->head;
380 spin_unlock(&client->buffer_lock);
381
382 spin_unlock_irq(&input->event_lock);
383
384 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
385 return -EFAULT;
386
387 return sizeof(struct JS_DATA_TYPE);
388}
389
390static inline int joydev_data_pending(struct joydev_client *client)
391{
392 struct joydev *joydev = client->joydev;
393
394 return client->startup < joydev->nabs + joydev->nkey ||
395 client->head != client->tail;
396}
397
398static ssize_t joydev_read(struct file *file, char __user *buf,
399 size_t count, loff_t *ppos)
400{
401 struct joydev_client *client = file->private_data;
402 struct joydev *joydev = client->joydev;
403 struct input_dev *input = joydev->handle.dev;
404 struct js_event event;
405 int retval;
406
407 if (!joydev->exist)
408 return -ENODEV;
409
410 if (count < sizeof(struct js_event))
411 return -EINVAL;
412
413 if (count == sizeof(struct JS_DATA_TYPE))
414 return joydev_0x_read(client, input, buf);
415
416 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
417 return -EAGAIN;
418
419 retval = wait_event_interruptible(joydev->wait,
420 !joydev->exist || joydev_data_pending(client));
421 if (retval)
422 return retval;
423
424 if (!joydev->exist)
425 return -ENODEV;
426
427 while (retval + sizeof(struct js_event) <= count &&
428 joydev_generate_startup_event(client, input, &event)) {
429
430 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
431 return -EFAULT;
432
433 retval += sizeof(struct js_event);
434 }
435
436 while (retval + sizeof(struct js_event) <= count &&
437 joydev_fetch_next_event(client, &event)) {
438
439 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
440 return -EFAULT;
441
442 retval += sizeof(struct js_event);
443 }
444
445 return retval;
446}
447
448/* No kernel lock - fine */
449static unsigned int joydev_poll(struct file *file, poll_table *wait)
450{
451 struct joydev_client *client = file->private_data;
452 struct joydev *joydev = client->joydev;
453
454 poll_wait(file, &joydev->wait, wait);
455 return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
456 (joydev->exist ? 0 : (POLLHUP | POLLERR));
457}
458
459static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
460 void __user *argp, size_t len)
461{
462 __u8 *abspam;
463 int i;
464 int retval = 0;
465
466 len = min(len, sizeof(joydev->abspam));
467
468 /* Validate the map. */
469 abspam = kmalloc(len, GFP_KERNEL);
470 if (!abspam)
471 return -ENOMEM;
472
473 if (copy_from_user(abspam, argp, len)) {
474 retval = -EFAULT;
475 goto out;
476 }
477
478 for (i = 0; i < joydev->nabs; i++) {
479 if (abspam[i] > ABS_MAX) {
480 retval = -EINVAL;
481 goto out;
482 }
483 }
484
485 memcpy(joydev->abspam, abspam, len);
486
487 for (i = 0; i < joydev->nabs; i++)
488 joydev->absmap[joydev->abspam[i]] = i;
489
490 out:
491 kfree(abspam);
492 return retval;
493}
494
495static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
496 void __user *argp, size_t len)
497{
498 __u16 *keypam;
499 int i;
500 int retval = 0;
501
502 len = min(len, sizeof(joydev->keypam));
503
504 /* Validate the map. */
505 keypam = kmalloc(len, GFP_KERNEL);
506 if (!keypam)
507 return -ENOMEM;
508
509 if (copy_from_user(keypam, argp, len)) {
510 retval = -EFAULT;
511 goto out;
512 }
513
514 for (i = 0; i < joydev->nkey; i++) {
515 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
516 retval = -EINVAL;
517 goto out;
518 }
519 }
520
521 memcpy(joydev->keypam, keypam, len);
522
523 for (i = 0; i < joydev->nkey; i++)
524 joydev->keymap[keypam[i] - BTN_MISC] = i;
525
526 out:
527 kfree(keypam);
528 return retval;
529}
530
531
532static int joydev_ioctl_common(struct joydev *joydev,
533 unsigned int cmd, void __user *argp)
534{
535 struct input_dev *dev = joydev->handle.dev;
536 size_t len;
537 int i;
538 const char *name;
539
540 /* Process fixed-sized commands. */
541 switch (cmd) {
542
543 case JS_SET_CAL:
544 return copy_from_user(&joydev->glue.JS_CORR, argp,
545 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
546
547 case JS_GET_CAL:
548 return copy_to_user(argp, &joydev->glue.JS_CORR,
549 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
550
551 case JS_SET_TIMEOUT:
552 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
553
554 case JS_GET_TIMEOUT:
555 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
556
557 case JSIOCGVERSION:
558 return put_user(JS_VERSION, (__u32 __user *) argp);
559
560 case JSIOCGAXES:
561 return put_user(joydev->nabs, (__u8 __user *) argp);
562
563 case JSIOCGBUTTONS:
564 return put_user(joydev->nkey, (__u8 __user *) argp);
565
566 case JSIOCSCORR:
567 if (copy_from_user(joydev->corr, argp,
568 sizeof(joydev->corr[0]) * joydev->nabs))
569 return -EFAULT;
570
571 for (i = 0; i < joydev->nabs; i++) {
572 int val = input_abs_get_val(dev, joydev->abspam[i]);
573 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
574 }
575 return 0;
576
577 case JSIOCGCORR:
578 return copy_to_user(argp, joydev->corr,
579 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
580
581 }
582
583 /*
584 * Process variable-sized commands (the axis and button map commands
585 * are considered variable-sized to decouple them from the values of
586 * ABS_MAX and KEY_MAX).
587 */
588 switch (cmd & ~IOCSIZE_MASK) {
589
590 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
591 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
592
593 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
594 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
595 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
596
597 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
598 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
599
600 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
601 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
602 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
603
604 case JSIOCGNAME(0):
605 name = dev->name;
606 if (!name)
607 return 0;
608
609 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
610 return copy_to_user(argp, name, len) ? -EFAULT : len;
611 }
612
613 return -EINVAL;
614}
615
616#ifdef CONFIG_COMPAT
617static long joydev_compat_ioctl(struct file *file,
618 unsigned int cmd, unsigned long arg)
619{
620 struct joydev_client *client = file->private_data;
621 struct joydev *joydev = client->joydev;
622 void __user *argp = (void __user *)arg;
623 s32 tmp32;
624 struct JS_DATA_SAVE_TYPE_32 ds32;
625 int retval;
626
627 retval = mutex_lock_interruptible(&joydev->mutex);
628 if (retval)
629 return retval;
630
631 if (!joydev->exist) {
632 retval = -ENODEV;
633 goto out;
634 }
635
636 switch (cmd) {
637
638 case JS_SET_TIMELIMIT:
639 retval = get_user(tmp32, (s32 __user *) arg);
640 if (retval == 0)
641 joydev->glue.JS_TIMELIMIT = tmp32;
642 break;
643
644 case JS_GET_TIMELIMIT:
645 tmp32 = joydev->glue.JS_TIMELIMIT;
646 retval = put_user(tmp32, (s32 __user *) arg);
647 break;
648
649 case JS_SET_ALL:
650 retval = copy_from_user(&ds32, argp,
651 sizeof(ds32)) ? -EFAULT : 0;
652 if (retval == 0) {
653 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
654 joydev->glue.BUSY = ds32.BUSY;
655 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
656 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
657 joydev->glue.JS_SAVE = ds32.JS_SAVE;
658 joydev->glue.JS_CORR = ds32.JS_CORR;
659 }
660 break;
661
662 case JS_GET_ALL:
663 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
664 ds32.BUSY = joydev->glue.BUSY;
665 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
666 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
667 ds32.JS_SAVE = joydev->glue.JS_SAVE;
668 ds32.JS_CORR = joydev->glue.JS_CORR;
669
670 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
671 break;
672
673 default:
674 retval = joydev_ioctl_common(joydev, cmd, argp);
675 break;
676 }
677
678 out:
679 mutex_unlock(&joydev->mutex);
680 return retval;
681}
682#endif /* CONFIG_COMPAT */
683
684static long joydev_ioctl(struct file *file,
685 unsigned int cmd, unsigned long arg)
686{
687 struct joydev_client *client = file->private_data;
688 struct joydev *joydev = client->joydev;
689 void __user *argp = (void __user *)arg;
690 int retval;
691
692 retval = mutex_lock_interruptible(&joydev->mutex);
693 if (retval)
694 return retval;
695
696 if (!joydev->exist) {
697 retval = -ENODEV;
698 goto out;
699 }
700
701 switch (cmd) {
702
703 case JS_SET_TIMELIMIT:
704 retval = get_user(joydev->glue.JS_TIMELIMIT,
705 (long __user *) arg);
706 break;
707
708 case JS_GET_TIMELIMIT:
709 retval = put_user(joydev->glue.JS_TIMELIMIT,
710 (long __user *) arg);
711 break;
712
713 case JS_SET_ALL:
714 retval = copy_from_user(&joydev->glue, argp,
715 sizeof(joydev->glue)) ? -EFAULT: 0;
716 break;
717
718 case JS_GET_ALL:
719 retval = copy_to_user(argp, &joydev->glue,
720 sizeof(joydev->glue)) ? -EFAULT : 0;
721 break;
722
723 default:
724 retval = joydev_ioctl_common(joydev, cmd, argp);
725 break;
726 }
727 out:
728 mutex_unlock(&joydev->mutex);
729 return retval;
730}
731
732static const struct file_operations joydev_fops = {
733 .owner = THIS_MODULE,
734 .read = joydev_read,
735 .poll = joydev_poll,
736 .open = joydev_open,
737 .release = joydev_release,
738 .unlocked_ioctl = joydev_ioctl,
739#ifdef CONFIG_COMPAT
740 .compat_ioctl = joydev_compat_ioctl,
741#endif
742 .fasync = joydev_fasync,
743 .llseek = no_llseek,
744};
745
746static int joydev_install_chrdev(struct joydev *joydev)
747{
748 joydev_table[joydev->minor] = joydev;
749 return 0;
750}
751
752static void joydev_remove_chrdev(struct joydev *joydev)
753{
754 mutex_lock(&joydev_table_mutex);
755 joydev_table[joydev->minor] = NULL;
756 mutex_unlock(&joydev_table_mutex);
757}
758
759/*
760 * Mark device non-existent. This disables writes, ioctls and
761 * prevents new users from opening the device. Already posted
762 * blocking reads will stay, however new ones will fail.
763 */
764static void joydev_mark_dead(struct joydev *joydev)
765{
766 mutex_lock(&joydev->mutex);
767 joydev->exist = false;
768 mutex_unlock(&joydev->mutex);
769}
770
771static void joydev_cleanup(struct joydev *joydev)
772{
773 struct input_handle *handle = &joydev->handle;
774
775 joydev_mark_dead(joydev);
776 joydev_hangup(joydev);
777 joydev_remove_chrdev(joydev);
778
779 /* joydev is marked dead so no one else accesses joydev->open */
780 if (joydev->open)
781 input_close_device(handle);
782}
783
784
785static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
786{
787 /* Avoid touchpads and touchscreens */
788 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
789 return false;
790
791 /* Avoid tablets, digitisers and similar devices */
792 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit))
793 return false;
794
795 return true;
796}
797
798static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
799 const struct input_device_id *id)
800{
801 struct joydev *joydev;
802 int i, j, t, minor;
803 int error;
804
805 for (minor = 0; minor < JOYDEV_MINORS; minor++)
806 if (!joydev_table[minor])
807 break;
808
809 if (minor == JOYDEV_MINORS) {
810 pr_err("no more free joydev devices\n");
811 return -ENFILE;
812 }
813
814 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
815 if (!joydev)
816 return -ENOMEM;
817
818 INIT_LIST_HEAD(&joydev->client_list);
819 spin_lock_init(&joydev->client_lock);
820 mutex_init(&joydev->mutex);
821 init_waitqueue_head(&joydev->wait);
822
823 dev_set_name(&joydev->dev, "js%d", minor);
824 joydev->exist = true;
825 joydev->minor = minor;
826
827 joydev->handle.dev = input_get_device(dev);
828 joydev->handle.name = dev_name(&joydev->dev);
829 joydev->handle.handler = handler;
830 joydev->handle.private = joydev;
831
832 for (i = 0; i < ABS_CNT; i++)
833 if (test_bit(i, dev->absbit)) {
834 joydev->absmap[i] = joydev->nabs;
835 joydev->abspam[joydev->nabs] = i;
836 joydev->nabs++;
837 }
838
839 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
840 if (test_bit(i + BTN_MISC, dev->keybit)) {
841 joydev->keymap[i] = joydev->nkey;
842 joydev->keypam[joydev->nkey] = i + BTN_MISC;
843 joydev->nkey++;
844 }
845
846 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
847 if (test_bit(i + BTN_MISC, dev->keybit)) {
848 joydev->keymap[i] = joydev->nkey;
849 joydev->keypam[joydev->nkey] = i + BTN_MISC;
850 joydev->nkey++;
851 }
852
853 for (i = 0; i < joydev->nabs; i++) {
854 j = joydev->abspam[i];
855 if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
856 joydev->corr[i].type = JS_CORR_NONE;
857 joydev->abs[i] = input_abs_get_val(dev, j);
858 continue;
859 }
860 joydev->corr[i].type = JS_CORR_BROKEN;
861 joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
862
863 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
864 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
865 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
866
867 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
868 - 2 * input_abs_get_flat(dev, j);
869 if (t) {
870 joydev->corr[i].coef[2] = (1 << 29) / t;
871 joydev->corr[i].coef[3] = (1 << 29) / t;
872
873 joydev->abs[i] =
874 joydev_correct(input_abs_get_val(dev, j),
875 joydev->corr + i);
876 }
877 }
878
879 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
880 joydev->dev.class = &input_class;
881 joydev->dev.parent = &dev->dev;
882 joydev->dev.release = joydev_free;
883 device_initialize(&joydev->dev);
884
885 error = input_register_handle(&joydev->handle);
886 if (error)
887 goto err_free_joydev;
888
889 error = joydev_install_chrdev(joydev);
890 if (error)
891 goto err_unregister_handle;
892
893 error = device_add(&joydev->dev);
894 if (error)
895 goto err_cleanup_joydev;
896
897 return 0;
898
899 err_cleanup_joydev:
900 joydev_cleanup(joydev);
901 err_unregister_handle:
902 input_unregister_handle(&joydev->handle);
903 err_free_joydev:
904 put_device(&joydev->dev);
905 return error;
906}
907
908static void joydev_disconnect(struct input_handle *handle)
909{
910 struct joydev *joydev = handle->private;
911
912 device_del(&joydev->dev);
913 joydev_cleanup(joydev);
914 input_unregister_handle(handle);
915 put_device(&joydev->dev);
916}
917
918static const struct input_device_id joydev_ids[] = {
919 {
920 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
921 INPUT_DEVICE_ID_MATCH_ABSBIT,
922 .evbit = { BIT_MASK(EV_ABS) },
923 .absbit = { BIT_MASK(ABS_X) },
924 },
925 {
926 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
927 INPUT_DEVICE_ID_MATCH_ABSBIT,
928 .evbit = { BIT_MASK(EV_ABS) },
929 .absbit = { BIT_MASK(ABS_WHEEL) },
930 },
931 {
932 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
933 INPUT_DEVICE_ID_MATCH_ABSBIT,
934 .evbit = { BIT_MASK(EV_ABS) },
935 .absbit = { BIT_MASK(ABS_THROTTLE) },
936 },
937 {
938 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
939 INPUT_DEVICE_ID_MATCH_KEYBIT,
940 .evbit = { BIT_MASK(EV_KEY) },
941 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
942 },
943 {
944 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
945 INPUT_DEVICE_ID_MATCH_KEYBIT,
946 .evbit = { BIT_MASK(EV_KEY) },
947 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
948 },
949 {
950 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
951 INPUT_DEVICE_ID_MATCH_KEYBIT,
952 .evbit = { BIT_MASK(EV_KEY) },
953 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
954 },
955 { } /* Terminating entry */
956};
957
958MODULE_DEVICE_TABLE(input, joydev_ids);
959
960static struct input_handler joydev_handler = {
961 .event = joydev_event,
962 .match = joydev_match,
963 .connect = joydev_connect,
964 .disconnect = joydev_disconnect,
965 .fops = &joydev_fops,
966 .minor = JOYDEV_MINOR_BASE,
967 .name = "joydev",
968 .id_table = joydev_ids,
969};
970
971static int __init joydev_init(void)
972{
973 return input_register_handler(&joydev_handler);
974}
975
976static void __exit joydev_exit(void)
977{
978 input_unregister_handler(&joydev_handler);
979}
980
981module_init(joydev_init);
982module_exit(joydev_exit);