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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / drivers / input / joydev.c
blob83341633473db99e3f0c21e50917cc0837622924
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 #include <linux/module.h>
32 #include <linux/moduleparam.h>
33
34 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
35 MODULE_DESCRIPTION("Joystick device interfaces");
36 MODULE_SUPPORTED_DEVICE("input/js");
37 MODULE_LICENSE("GPL");
38 #define JOYDEV_MINOR_BASE 0
39 #define JOYDEV_MINORS 16
40 #define JOYDEV_BUFFER_SIZE 64
41 #define MAX_REMAP_SIZE 10
42
43 static int remap_array[MAX_REMAP_SIZE];
44 static int remap_count = 0;
45 static int free_buttons[MAX_REMAP_SIZE];
46
47 struct joydev {
48 int open;
49 int minor;
50 struct input_handle handle;
51 wait_queue_head_t wait;
52 struct list_head client_list;
53 spinlock_t client_lock; /* protects client_list */
54 struct mutex mutex;
55 struct device dev;
56 bool exist;
57
58 struct js_corr corr[ABS_CNT];
59 struct JS_DATA_SAVE_TYPE glue;
60 int nabs;
61 int nkey;
62 __u16 keymap[KEY_MAX - BTN_MISC + 1];
63 __u16 keypam[KEY_MAX - BTN_MISC + 1];
64 __u8 absmap[ABS_CNT];
65 __u8 abspam[ABS_CNT];
66 __s16 abs[ABS_CNT];
67 };
68
69 struct joydev_client {
70 struct js_event buffer[JOYDEV_BUFFER_SIZE];
71 int head;
72 int tail;
73 int startup;
74 spinlock_t buffer_lock; /* protects access to buffer, head and tail */
75 struct fasync_struct *fasync;
76 struct joydev *joydev;
77 struct list_head node;
78 };
79
80 static struct joydev *joydev_table[JOYDEV_MINORS];
81 static DEFINE_MUTEX(joydev_table_mutex);
82
83 module_param_array(remap_array, int, &remap_count, 0 );
84 MODULE_PARM_DESC( remap_array, "remap axis to buttons\n" );
85
86 static int joydev_correct(int value, struct js_corr *corr)
87 {
88 switch (corr->type) {
89
90 case JS_CORR_NONE:
91 break;
92
93 case JS_CORR_BROKEN:
94 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
95 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
96 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
97 break;
98
99 default:
100 return 0;
101 }
102
103 return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
104 }
105
106 static void joydev_pass_event(struct joydev_client *client,
107 struct js_event *event)
108 {
109 struct joydev *joydev = client->joydev;
110
111 /*
112 * IRQs already disabled, just acquire the lock
113 */
114 spin_lock(&client->buffer_lock);
115
116 client->buffer[client->head] = *event;
117
118 if (client->startup == joydev->nabs + joydev->nkey) {
119 client->head++;
120 client->head &= JOYDEV_BUFFER_SIZE - 1;
121 if (client->tail == client->head)
122 client->startup = 0;
123 }
124
125 spin_unlock(&client->buffer_lock);
126
127 kill_fasync(&client->fasync, SIGIO, POLL_IN);
128 }
129
130 static void joydev_event(struct input_handle *handle,
131 unsigned int type, unsigned int code, int value)
132 {
133 struct joydev *joydev = handle->private;
134 struct joydev_client *client;
135 struct js_event event;
136 int i;
137
138 if( remap_count > 0 && remap_count < MAX_REMAP_SIZE ){
139 for( i = 0; i < remap_count; i++ )
140 if( code == remap_array[i] ){
141 type = EV_KEY;
142 code = free_buttons[i];
143 if( value == 255 )
144 value = 1;
145 }
146 }
147
148 switch (type) {
149
150 case EV_KEY:
151 if (code < BTN_MISC || value == 2)
152 return;
153 event.type = JS_EVENT_BUTTON;
154 event.number = joydev->keymap[code - BTN_MISC];
155 event.value = value;
156 break;
157
158 case EV_ABS:
159 event.type = JS_EVENT_AXIS;
160 event.number = joydev->absmap[code];
161 event.value = joydev_correct(value,
162 &joydev->corr[event.number]);
163 if (event.value == joydev->abs[event.number])
164 return;
165 joydev->abs[event.number] = event.value;
166 break;
167
168 default:
169 return;
170 }
171
172 event.time = jiffies_to_msecs(jiffies);
173
174 rcu_read_lock();
175 list_for_each_entry_rcu(client, &joydev->client_list, node)
176 joydev_pass_event(client, &event);
177 rcu_read_unlock();
178
179 wake_up_interruptible(&joydev->wait);
180 }
181
182 static int joydev_fasync(int fd, struct file *file, int on)
183 {
184 struct joydev_client *client = file->private_data;
185
186 return fasync_helper(fd, file, on, &client->fasync);
187 }
188
189 static void joydev_free(struct device *dev)
190 {
191 struct joydev *joydev = container_of(dev, struct joydev, dev);
192
193 input_put_device(joydev->handle.dev);
194 kfree(joydev);
195 }
196
197 static void joydev_attach_client(struct joydev *joydev,
198 struct joydev_client *client)
199 {
200 spin_lock(&joydev->client_lock);
201 list_add_tail_rcu(&client->node, &joydev->client_list);
202 spin_unlock(&joydev->client_lock);
203 }
204
205 static void joydev_detach_client(struct joydev *joydev,
206 struct joydev_client *client)
207 {
208 spin_lock(&joydev->client_lock);
209 list_del_rcu(&client->node);
210 spin_unlock(&joydev->client_lock);
211 synchronize_rcu();
212 }
213
214 static int joydev_open_device(struct joydev *joydev)
215 {
216 int retval;
217
218 retval = mutex_lock_interruptible(&joydev->mutex);
219 if (retval)
220 return retval;
221
222 if (!joydev->exist)
223 retval = -ENODEV;
224 else if (!joydev->open++) {
225 retval = input_open_device(&joydev->handle);
226 if (retval)
227 joydev->open--;
228 }
229
230 mutex_unlock(&joydev->mutex);
231 return retval;
232 }
233
234 static void joydev_close_device(struct joydev *joydev)
235 {
236 mutex_lock(&joydev->mutex);
237
238 if (joydev->exist && !--joydev->open)
239 input_close_device(&joydev->handle);
240
241 mutex_unlock(&joydev->mutex);
242 }
243
244 /*
245 * Wake up users waiting for IO so they can disconnect from
246 * dead device.
247 */
248 static void joydev_hangup(struct joydev *joydev)
249 {
250 struct joydev_client *client;
251
252 spin_lock(&joydev->client_lock);
253 list_for_each_entry(client, &joydev->client_list, node)
254 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
255 spin_unlock(&joydev->client_lock);
256
257 wake_up_interruptible(&joydev->wait);
258 }
259
260 static int joydev_release(struct inode *inode, struct file *file)
261 {
262 struct joydev_client *client = file->private_data;
263 struct joydev *joydev = client->joydev;
264
265 joydev_detach_client(joydev, client);
266 kfree(client);
267
268 joydev_close_device(joydev);
269 put_device(&joydev->dev);
270
271 return 0;
272 }
273
274 static int joydev_open(struct inode *inode, struct file *file)
275 {
276 struct joydev_client *client;
277 struct joydev *joydev;
278 int i = iminor(inode) - JOYDEV_MINOR_BASE;
279 int error;
280
281 if (i >= JOYDEV_MINORS)
282 return -ENODEV;
283
284 error = mutex_lock_interruptible(&joydev_table_mutex);
285 if (error)
286 return error;
287 joydev = joydev_table[i];
288 if (joydev)
289 get_device(&joydev->dev);
290 mutex_unlock(&joydev_table_mutex);
291
292 if (!joydev)
293 return -ENODEV;
294
295 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
296 if (!client) {
297 error = -ENOMEM;
298 goto err_put_joydev;
299 }
300
301 spin_lock_init(&client->buffer_lock);
302 client->joydev = joydev;
303 joydev_attach_client(joydev, client);
304
305 error = joydev_open_device(joydev);
306 if (error)
307 goto err_free_client;
308
309 file->private_data = client;
310 nonseekable_open(inode, file);
311
312 return 0;
313
314 err_free_client:
315 joydev_detach_client(joydev, client);
316 kfree(client);
317 err_put_joydev:
318 put_device(&joydev->dev);
319 return error;
320 }
321
322 static int joydev_generate_startup_event(struct joydev_client *client,
323 struct input_dev *input,
324 struct js_event *event)
325 {
326 struct joydev *joydev = client->joydev;
327 int have_event;
328
329 spin_lock_irq(&client->buffer_lock);
330
331 have_event = client->startup < joydev->nabs + joydev->nkey;
332
333 if (have_event) {
334
335 event->time = jiffies_to_msecs(jiffies);
336 if (client->startup < joydev->nkey) {
337 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
338 event->number = client->startup;
339 event->value = !!test_bit(joydev->keypam[event->number],
340 input->key);
341 } else {
342 event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
343 event->number = client->startup - joydev->nkey;
344 event->value = joydev->abs[event->number];
345 }
346 client->startup++;
347 }
348
349 spin_unlock_irq(&client->buffer_lock);
350
351 return have_event;
352 }
353
354 static int joydev_fetch_next_event(struct joydev_client *client,
355 struct js_event *event)
356 {
357 int have_event;
358
359 spin_lock_irq(&client->buffer_lock);
360
361 have_event = client->head != client->tail;
362 if (have_event) {
363 *event = client->buffer[client->tail++];
364 client->tail &= JOYDEV_BUFFER_SIZE - 1;
365 }
366
367 spin_unlock_irq(&client->buffer_lock);
368
369 return have_event;
370 }
371
372 /*
373 * Old joystick interface
374 */
375 static ssize_t joydev_0x_read(struct joydev_client *client,
376 struct input_dev *input,
377 char __user *buf)
378 {
379 struct joydev *joydev = client->joydev;
380 struct JS_DATA_TYPE data;
381 int i;
382
383 spin_lock_irq(&input->event_lock);
384
385 /*
386 * Get device state
387 */
388 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
389 data.buttons |=
390 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
391 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
392 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
393
394 /*
395 * Reset reader's event queue
396 */
397 spin_lock(&client->buffer_lock);
398 client->startup = 0;
399 client->tail = client->head;
400 spin_unlock(&client->buffer_lock);
401
402 spin_unlock_irq(&input->event_lock);
403
404 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
405 return -EFAULT;
406
407 return sizeof(struct JS_DATA_TYPE);
408 }
409
410 static inline int joydev_data_pending(struct joydev_client *client)
411 {
412 struct joydev *joydev = client->joydev;
413
414 return client->startup < joydev->nabs + joydev->nkey ||
415 client->head != client->tail;
416 }
417
418 static ssize_t joydev_read(struct file *file, char __user *buf,
419 size_t count, loff_t *ppos)
420 {
421 struct joydev_client *client = file->private_data;
422 struct joydev *joydev = client->joydev;
423 struct input_dev *input = joydev->handle.dev;
424 struct js_event event;
425 int retval;
426
427 if (!joydev->exist)
428 return -ENODEV;
429
430 if (count < sizeof(struct js_event))
431 return -EINVAL;
432
433 if (count == sizeof(struct JS_DATA_TYPE))
434 return joydev_0x_read(client, input, buf);
435
436 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
437 return -EAGAIN;
438
439 retval = wait_event_interruptible(joydev->wait,
440 !joydev->exist || joydev_data_pending(client));
441 if (retval)
442 return retval;
443
444 if (!joydev->exist)
445 return -ENODEV;
446
447 while (retval + sizeof(struct js_event) <= count &&
448 joydev_generate_startup_event(client, input, &event)) {
449
450 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
451 return -EFAULT;
452
453 retval += sizeof(struct js_event);
454 }
455
456 while (retval + sizeof(struct js_event) <= count &&
457 joydev_fetch_next_event(client, &event)) {
458
459 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
460 return -EFAULT;
461
462 retval += sizeof(struct js_event);
463 }
464
465 return retval;
466 }
467
468 /* No kernel lock - fine */
469 static unsigned int joydev_poll(struct file *file, poll_table *wait)
470 {
471 struct joydev_client *client = file->private_data;
472 struct joydev *joydev = client->joydev;
473
474 poll_wait(file, &joydev->wait, wait);
475 return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
476 (joydev->exist ? 0 : (POLLHUP | POLLERR));
477 }
478
479 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
480 void __user *argp, size_t len)
481 {
482 __u8 *abspam;
483 int i;
484 int retval = 0;
485
486 len = min(len, sizeof(joydev->abspam));
487
488 /* Validate the map. */
489 abspam = kmalloc(len, GFP_KERNEL);
490 if (!abspam)
491 return -ENOMEM;
492
493 if (copy_from_user(abspam, argp, len)) {
494 retval = -EFAULT;
495 goto out;
496 }
497
498 for (i = 0; i < joydev->nabs; i++) {
499 if (abspam[i] > ABS_MAX) {
500 retval = -EINVAL;
501 goto out;
502 }
503 }
504
505 memcpy(joydev->abspam, abspam, len);
506
507 for (i = 0; i < joydev->nabs; i++)
508 joydev->absmap[joydev->abspam[i]] = i;
509
510 out:
511 kfree(abspam);
512 return retval;
513 }
514
515 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
516 void __user *argp, size_t len)
517 {
518 __u16 *keypam;
519 int i;
520 int retval = 0;
521
522 len = min(len, sizeof(joydev->keypam));
523
524 /* Validate the map. */
525 keypam = kmalloc(len, GFP_KERNEL);
526 if (!keypam)
527 return -ENOMEM;
528
529 if (copy_from_user(keypam, argp, len)) {
530 retval = -EFAULT;
531 goto out;
532 }
533
534 for (i = 0; i < joydev->nkey; i++) {
535 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
536 retval = -EINVAL;
537 goto out;
538 }
539 }
540
541 memcpy(joydev->keypam, keypam, len);
542
543 for (i = 0; i < joydev->nkey; i++)
544 joydev->keymap[keypam[i] - BTN_MISC] = i;
545
546 out:
547 kfree(keypam);
548 return retval;
549 }
550
551
552 static int joydev_ioctl_common(struct joydev *joydev,
553 unsigned int cmd, void __user *argp)
554 {
555 struct input_dev *dev = joydev->handle.dev;
556 size_t len;
557 int i;
558 const char *name;
559
560 /* Process fixed-sized commands. */
561 switch (cmd) {
562
563 case JS_SET_CAL:
564 return copy_from_user(&joydev->glue.JS_CORR, argp,
565 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
566
567 case JS_GET_CAL:
568 return copy_to_user(argp, &joydev->glue.JS_CORR,
569 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
570
571 case JS_SET_TIMEOUT:
572 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
573
574 case JS_GET_TIMEOUT:
575 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
576
577 case JSIOCGVERSION:
578 return put_user(JS_VERSION, (__u32 __user *) argp);
579
580 case JSIOCGAXES:
581 return put_user(joydev->nabs, (__u8 __user *) argp);
582
583 case JSIOCGBUTTONS:
584 return put_user(joydev->nkey, (__u8 __user *) argp);
585
586 case JSIOCSCORR:
587 if (copy_from_user(joydev->corr, argp,
588 sizeof(joydev->corr[0]) * joydev->nabs))
589 return -EFAULT;
590
591 for (i = 0; i < joydev->nabs; i++) {
592 int val = input_abs_get_val(dev, joydev->abspam[i]);
593 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
594 }
595 return 0;
596
597 case JSIOCGCORR:
598 return copy_to_user(argp, joydev->corr,
599 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
600
601 }
602
603 /*
604 * Process variable-sized commands (the axis and button map commands
605 * are considered variable-sized to decouple them from the values of
606 * ABS_MAX and KEY_MAX).
607 */
608 switch (cmd & ~IOCSIZE_MASK) {
609
610 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
611 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
612
613 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
614 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
615 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
616
617 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
618 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
619
620 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
621 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
622 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
623
624 case JSIOCGNAME(0):
625 name = dev->name;
626 if (!name)
627 return 0;
628
629 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
630 return copy_to_user(argp, name, len) ? -EFAULT : len;
631 }
632
633 return -EINVAL;
634 }
635
636 #ifdef CONFIG_COMPAT
637 static long joydev_compat_ioctl(struct file *file,
638 unsigned int cmd, unsigned long arg)
639 {
640 struct joydev_client *client = file->private_data;
641 struct joydev *joydev = client->joydev;
642 void __user *argp = (void __user *)arg;
643 s32 tmp32;
644 struct JS_DATA_SAVE_TYPE_32 ds32;
645 int retval;
646
647 retval = mutex_lock_interruptible(&joydev->mutex);
648 if (retval)
649 return retval;
650
651 if (!joydev->exist) {
652 retval = -ENODEV;
653 goto out;
654 }
655
656 switch (cmd) {
657
658 case JS_SET_TIMELIMIT:
659 retval = get_user(tmp32, (s32 __user *) arg);
660 if (retval == 0)
661 joydev->glue.JS_TIMELIMIT = tmp32;
662 break;
663
664 case JS_GET_TIMELIMIT:
665 tmp32 = joydev->glue.JS_TIMELIMIT;
666 retval = put_user(tmp32, (s32 __user *) arg);
667 break;
668
669 case JS_SET_ALL:
670 retval = copy_from_user(&ds32, argp,
671 sizeof(ds32)) ? -EFAULT : 0;
672 if (retval == 0) {
673 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
674 joydev->glue.BUSY = ds32.BUSY;
675 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
676 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
677 joydev->glue.JS_SAVE = ds32.JS_SAVE;
678 joydev->glue.JS_CORR = ds32.JS_CORR;
679 }
680 break;
681
682 case JS_GET_ALL:
683 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
684 ds32.BUSY = joydev->glue.BUSY;
685 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
686 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
687 ds32.JS_SAVE = joydev->glue.JS_SAVE;
688 ds32.JS_CORR = joydev->glue.JS_CORR;
689
690 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
691 break;
692
693 default:
694 retval = joydev_ioctl_common(joydev, cmd, argp);
695 break;
696 }
697
698 out:
699 mutex_unlock(&joydev->mutex);
700 return retval;
701 }
702 #endif /* CONFIG_COMPAT */
703
704 static long joydev_ioctl(struct file *file,
705 unsigned int cmd, unsigned long arg)
706 {
707 struct joydev_client *client = file->private_data;
708 struct joydev *joydev = client->joydev;
709 void __user *argp = (void __user *)arg;
710 int retval;
711
712 retval = mutex_lock_interruptible(&joydev->mutex);
713 if (retval)
714 return retval;
715
716 if (!joydev->exist) {
717 retval = -ENODEV;
718 goto out;
719 }
720
721 switch (cmd) {
722
723 case JS_SET_TIMELIMIT:
724 retval = get_user(joydev->glue.JS_TIMELIMIT,
725 (long __user *) arg);
726 break;
727
728 case JS_GET_TIMELIMIT:
729 retval = put_user(joydev->glue.JS_TIMELIMIT,
730 (long __user *) arg);
731 break;
732
733 case JS_SET_ALL:
734 retval = copy_from_user(&joydev->glue, argp,
735 sizeof(joydev->glue)) ? -EFAULT: 0;
736 break;
737
738 case JS_GET_ALL:
739 retval = copy_to_user(argp, &joydev->glue,
740 sizeof(joydev->glue)) ? -EFAULT : 0;
741 break;
742
743 default:
744 retval = joydev_ioctl_common(joydev, cmd, argp);
745 break;
746 }
747 out:
748 mutex_unlock(&joydev->mutex);
749 return retval;
750 }
751
752 static const struct file_operations joydev_fops = {
753 .owner = THIS_MODULE,
754 .read = joydev_read,
755 .poll = joydev_poll,
756 .open = joydev_open,
757 .release = joydev_release,
758 .unlocked_ioctl = joydev_ioctl,
759 #ifdef CONFIG_COMPAT
760 .compat_ioctl = joydev_compat_ioctl,
761 #endif
762 .fasync = joydev_fasync,
763 .llseek = no_llseek,
764 };
765
766 static int joydev_install_chrdev(struct joydev *joydev)
767 {
768 joydev_table[joydev->minor] = joydev;
769 return 0;
770 }
771
772 static void joydev_remove_chrdev(struct joydev *joydev)
773 {
774 mutex_lock(&joydev_table_mutex);
775 joydev_table[joydev->minor] = NULL;
776 mutex_unlock(&joydev_table_mutex);
777 }
778
779 /*
780 * Mark device non-existent. This disables writes, ioctls and
781 * prevents new users from opening the device. Already posted
782 * blocking reads will stay, however new ones will fail.
783 */
784 static void joydev_mark_dead(struct joydev *joydev)
785 {
786 mutex_lock(&joydev->mutex);
787 joydev->exist = false;
788 mutex_unlock(&joydev->mutex);
789 }
790
791 static void joydev_cleanup(struct joydev *joydev)
792 {
793 struct input_handle *handle = &joydev->handle;
794
795 joydev_mark_dead(joydev);
796 joydev_hangup(joydev);
797 joydev_remove_chrdev(joydev);
798
799 /* joydev is marked dead so no one else accesses joydev->open */
800 if (joydev->open)
801 input_close_device(handle);
802 }
803
804
805 static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
806 {
807 /* Avoid touchpads and touchscreens */
808 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
809 return false;
810
811 /* Avoid tablets, digitisers and similar devices */
812 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit))
813 return false;
814
815 return true;
816 }
817
818 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
819 const struct input_device_id *id)
820 {
821 struct joydev *joydev;
822 int i, j = 0, t, minor;
823 int error;
824
825 for (minor = 0; minor < JOYDEV_MINORS; minor++)
826 if (!joydev_table[minor])
827 break;
828
829 if (minor == JOYDEV_MINORS) {
830 pr_err("no more free joydev devices\n");
831 return -ENFILE;
832 }
833
834 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
835 if (!joydev)
836 return -ENOMEM;
837
838 INIT_LIST_HEAD(&joydev->client_list);
839 spin_lock_init(&joydev->client_lock);
840 mutex_init(&joydev->mutex);
841 init_waitqueue_head(&joydev->wait);
842
843 dev_set_name(&joydev->dev, "js%d", minor);
844 joydev->exist = true;
845 joydev->minor = minor;
846
847 joydev->handle.dev = input_get_device(dev);
848 joydev->handle.name = dev_name(&joydev->dev);
849 joydev->handle.handler = handler;
850 joydev->handle.private = joydev;
851
852 for (i = 0; i < ABS_CNT; i++)
853 if (test_bit(i, dev->absbit)) {
854 joydev->absmap[i] = joydev->nabs;
855 joydev->abspam[joydev->nabs] = i;
856 joydev->nabs++;
857 }
858
859 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
860 if (test_bit(i + BTN_MISC, dev->keybit)) {
861 joydev->keymap[i] = joydev->nkey;
862 joydev->keypam[joydev->nkey] = i + BTN_MISC;
863 joydev->nkey++;
864 j = i;
865 }
866 if( remap_count > 0 && remap_count < MAX_REMAP_SIZE ){
867 printk( "[joydev] axis remapping enabled\n" );
868 for( i = 0; i < remap_count; i++ ){
869 joydev->keymap[j + i + 1] = joydev->nkey;
870 joydev->keypam[joydev->nkey] = i + j + 1 + BTN_MISC;
871 free_buttons[i] = j + i + 1 + BTN_MISC;
872 joydev->nkey++;
873
874 }
875 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
876 if (test_bit(i + BTN_MISC, dev->keybit)) {
877 joydev->keymap[i] = joydev->nkey;
878 joydev->keypam[joydev->nkey] = i + BTN_MISC;
879 joydev->nkey++;
880 }
881 }
882 for (i = 0; i < joydev->nabs; i++) {
883 j = joydev->abspam[i];
884 if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
885 joydev->corr[i].type = JS_CORR_NONE;
886 joydev->abs[i] = input_abs_get_val(dev, j);
887 continue;
888 }
889 joydev->corr[i].type = JS_CORR_BROKEN;
890 joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
891
892 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
893 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
894 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
895
896 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
897 - 2 * input_abs_get_flat(dev, j);
898 if (t) {
899 joydev->corr[i].coef[2] = (1 << 29) / t;
900 joydev->corr[i].coef[3] = (1 << 29) / t;
901
902 joydev->abs[i] =
903 joydev_correct(input_abs_get_val(dev, j),
904 joydev->corr + i);
905 }
906 }
907
908 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
909 joydev->dev.class = &input_class;
910 joydev->dev.parent = &dev->dev;
911 joydev->dev.release = joydev_free;
912 device_initialize(&joydev->dev);
913
914 error = input_register_handle(&joydev->handle);
915 if (error)
916 goto err_free_joydev;
917
918 error = joydev_install_chrdev(joydev);
919 if (error)
920 goto err_unregister_handle;
921
922 error = device_add(&joydev->dev);
923 if (error)
924 goto err_cleanup_joydev;
925
926 return 0;
927
928 err_cleanup_joydev:
929 joydev_cleanup(joydev);
930 err_unregister_handle:
931 input_unregister_handle(&joydev->handle);
932 err_free_joydev:
933 put_device(&joydev->dev);
934 return error;
935 }
936
937 static void joydev_disconnect(struct input_handle *handle)
938 {
939 struct joydev *joydev = handle->private;
940
941 device_del(&joydev->dev);
942 joydev_cleanup(joydev);
943 input_unregister_handle(handle);
944 put_device(&joydev->dev);
945 }
946
947 static const struct input_device_id joydev_ids[] = {
948 {
949 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
950 INPUT_DEVICE_ID_MATCH_ABSBIT,
951 .evbit = { BIT_MASK(EV_ABS) },
952 .absbit = { BIT_MASK(ABS_X) },
953 },
954 {
955 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
956 INPUT_DEVICE_ID_MATCH_ABSBIT,
957 .evbit = { BIT_MASK(EV_ABS) },
958 .absbit = { BIT_MASK(ABS_WHEEL) },
959 },
960 {
961 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
962 INPUT_DEVICE_ID_MATCH_ABSBIT,
963 .evbit = { BIT_MASK(EV_ABS) },
964 .absbit = { BIT_MASK(ABS_THROTTLE) },
965 },
966 {
967 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
968 INPUT_DEVICE_ID_MATCH_KEYBIT,
969 .evbit = { BIT_MASK(EV_KEY) },
970 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
971 },
972 {
973 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
974 INPUT_DEVICE_ID_MATCH_KEYBIT,
975 .evbit = { BIT_MASK(EV_KEY) },
976 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
977 },
978 {
979 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
980 INPUT_DEVICE_ID_MATCH_KEYBIT,
981 .evbit = { BIT_MASK(EV_KEY) },
982 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
983 },
984 { } /* Terminating entry */
985 };
986
987 MODULE_DEVICE_TABLE(input, joydev_ids);
988
989 static struct input_handler joydev_handler = {
990 .event = joydev_event,
991 .match = joydev_match,
992 .connect = joydev_connect,
993 .disconnect = joydev_disconnect,
994 .fops = &joydev_fops,
995 .minor = JOYDEV_MINOR_BASE,
996 .name = "joydev",
997 .id_table = joydev_ids,
998 };
999
1000 static int __init joydev_init(void)
1001 {
1002 return input_register_handler(&joydev_handler);
1003 }
1004
1005 static void __exit joydev_exit(void)
1006 {
1007 input_unregister_handler(&joydev_handler);
1008 }
1009
1010 module_init(joydev_init);
1011 module_exit(joydev_exit);