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Merge remote-tracking branch 'cleancache/linux-next'
[linux-2.6/next.git] / drivers / input / joydev.c
blob5688b5c88f2491a15b173b0a6f6a6e1c7998a5e5
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
32 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
33 MODULE_DESCRIPTION("Joystick device interfaces");
34 MODULE_SUPPORTED_DEVICE("input/js");
35 MODULE_LICENSE("GPL");
36
37 #define JOYDEV_MINOR_BASE 0
38 #define JOYDEV_MINORS 16
39 #define JOYDEV_BUFFER_SIZE 64
40
41 struct 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
63 struct 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
74 static struct joydev *joydev_table[JOYDEV_MINORS];
75 static DEFINE_MUTEX(joydev_table_mutex);
76
77 static 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
97 static 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
121 static 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
162 static 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
169 static 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
177 static 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 synchronize_rcu();
184 }
185
186 static void joydev_detach_client(struct joydev *joydev,
187 struct joydev_client *client)
188 {
189 spin_lock(&joydev->client_lock);
190 list_del_rcu(&client->node);
191 spin_unlock(&joydev->client_lock);
192 synchronize_rcu();
193 }
194
195 static int joydev_open_device(struct joydev *joydev)
196 {
197 int retval;
198
199 retval = mutex_lock_interruptible(&joydev->mutex);
200 if (retval)
201 return retval;
202
203 if (!joydev->exist)
204 retval = -ENODEV;
205 else if (!joydev->open++) {
206 retval = input_open_device(&joydev->handle);
207 if (retval)
208 joydev->open--;
209 }
210
211 mutex_unlock(&joydev->mutex);
212 return retval;
213 }
214
215 static void joydev_close_device(struct joydev *joydev)
216 {
217 mutex_lock(&joydev->mutex);
218
219 if (joydev->exist && !--joydev->open)
220 input_close_device(&joydev->handle);
221
222 mutex_unlock(&joydev->mutex);
223 }
224
225 /*
226 * Wake up users waiting for IO so they can disconnect from
227 * dead device.
228 */
229 static void joydev_hangup(struct joydev *joydev)
230 {
231 struct joydev_client *client;
232
233 spin_lock(&joydev->client_lock);
234 list_for_each_entry(client, &joydev->client_list, node)
235 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
236 spin_unlock(&joydev->client_lock);
237
238 wake_up_interruptible(&joydev->wait);
239 }
240
241 static int joydev_release(struct inode *inode, struct file *file)
242 {
243 struct joydev_client *client = file->private_data;
244 struct joydev *joydev = client->joydev;
245
246 joydev_detach_client(joydev, client);
247 kfree(client);
248
249 joydev_close_device(joydev);
250 put_device(&joydev->dev);
251
252 return 0;
253 }
254
255 static int joydev_open(struct inode *inode, struct file *file)
256 {
257 struct joydev_client *client;
258 struct joydev *joydev;
259 int i = iminor(inode) - JOYDEV_MINOR_BASE;
260 int error;
261
262 if (i >= JOYDEV_MINORS)
263 return -ENODEV;
264
265 error = mutex_lock_interruptible(&joydev_table_mutex);
266 if (error)
267 return error;
268 joydev = joydev_table[i];
269 if (joydev)
270 get_device(&joydev->dev);
271 mutex_unlock(&joydev_table_mutex);
272
273 if (!joydev)
274 return -ENODEV;
275
276 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
277 if (!client) {
278 error = -ENOMEM;
279 goto err_put_joydev;
280 }
281
282 spin_lock_init(&client->buffer_lock);
283 client->joydev = joydev;
284 joydev_attach_client(joydev, client);
285
286 error = joydev_open_device(joydev);
287 if (error)
288 goto err_free_client;
289
290 file->private_data = client;
291 nonseekable_open(inode, file);
292
293 return 0;
294
295 err_free_client:
296 joydev_detach_client(joydev, client);
297 kfree(client);
298 err_put_joydev:
299 put_device(&joydev->dev);
300 return error;
301 }
302
303 static int joydev_generate_startup_event(struct joydev_client *client,
304 struct input_dev *input,
305 struct js_event *event)
306 {
307 struct joydev *joydev = client->joydev;
308 int have_event;
309
310 spin_lock_irq(&client->buffer_lock);
311
312 have_event = client->startup < joydev->nabs + joydev->nkey;
313
314 if (have_event) {
315
316 event->time = jiffies_to_msecs(jiffies);
317 if (client->startup < joydev->nkey) {
318 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
319 event->number = client->startup;
320 event->value = !!test_bit(joydev->keypam[event->number],
321 input->key);
322 } else {
323 event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
324 event->number = client->startup - joydev->nkey;
325 event->value = joydev->abs[event->number];
326 }
327 client->startup++;
328 }
329
330 spin_unlock_irq(&client->buffer_lock);
331
332 return have_event;
333 }
334
335 static int joydev_fetch_next_event(struct joydev_client *client,
336 struct js_event *event)
337 {
338 int have_event;
339
340 spin_lock_irq(&client->buffer_lock);
341
342 have_event = client->head != client->tail;
343 if (have_event) {
344 *event = client->buffer[client->tail++];
345 client->tail &= JOYDEV_BUFFER_SIZE - 1;
346 }
347
348 spin_unlock_irq(&client->buffer_lock);
349
350 return have_event;
351 }
352
353 /*
354 * Old joystick interface
355 */
356 static ssize_t joydev_0x_read(struct joydev_client *client,
357 struct input_dev *input,
358 char __user *buf)
359 {
360 struct joydev *joydev = client->joydev;
361 struct JS_DATA_TYPE data;
362 int i;
363
364 spin_lock_irq(&input->event_lock);
365
366 /*
367 * Get device state
368 */
369 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
370 data.buttons |=
371 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
372 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
373 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
374
375 /*
376 * Reset reader's event queue
377 */
378 spin_lock(&client->buffer_lock);
379 client->startup = 0;
380 client->tail = client->head;
381 spin_unlock(&client->buffer_lock);
382
383 spin_unlock_irq(&input->event_lock);
384
385 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
386 return -EFAULT;
387
388 return sizeof(struct JS_DATA_TYPE);
389 }
390
391 static inline int joydev_data_pending(struct joydev_client *client)
392 {
393 struct joydev *joydev = client->joydev;
394
395 return client->startup < joydev->nabs + joydev->nkey ||
396 client->head != client->tail;
397 }
398
399 static ssize_t joydev_read(struct file *file, char __user *buf,
400 size_t count, loff_t *ppos)
401 {
402 struct joydev_client *client = file->private_data;
403 struct joydev *joydev = client->joydev;
404 struct input_dev *input = joydev->handle.dev;
405 struct js_event event;
406 int retval;
407
408 if (!joydev->exist)
409 return -ENODEV;
410
411 if (count < sizeof(struct js_event))
412 return -EINVAL;
413
414 if (count == sizeof(struct JS_DATA_TYPE))
415 return joydev_0x_read(client, input, buf);
416
417 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
418 return -EAGAIN;
419
420 retval = wait_event_interruptible(joydev->wait,
421 !joydev->exist || joydev_data_pending(client));
422 if (retval)
423 return retval;
424
425 if (!joydev->exist)
426 return -ENODEV;
427
428 while (retval + sizeof(struct js_event) <= count &&
429 joydev_generate_startup_event(client, input, &event)) {
430
431 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
432 return -EFAULT;
433
434 retval += sizeof(struct js_event);
435 }
436
437 while (retval + sizeof(struct js_event) <= count &&
438 joydev_fetch_next_event(client, &event)) {
439
440 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
441 return -EFAULT;
442
443 retval += sizeof(struct js_event);
444 }
445
446 return retval;
447 }
448
449 /* No kernel lock - fine */
450 static unsigned int joydev_poll(struct file *file, poll_table *wait)
451 {
452 struct joydev_client *client = file->private_data;
453 struct joydev *joydev = client->joydev;
454
455 poll_wait(file, &joydev->wait, wait);
456 return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
457 (joydev->exist ? 0 : (POLLHUP | POLLERR));
458 }
459
460 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
461 void __user *argp, size_t len)
462 {
463 __u8 *abspam;
464 int i;
465 int retval = 0;
466
467 len = min(len, sizeof(joydev->abspam));
468
469 /* Validate the map. */
470 abspam = kmalloc(len, GFP_KERNEL);
471 if (!abspam)
472 return -ENOMEM;
473
474 if (copy_from_user(abspam, argp, len)) {
475 retval = -EFAULT;
476 goto out;
477 }
478
479 for (i = 0; i < joydev->nabs; i++) {
480 if (abspam[i] > ABS_MAX) {
481 retval = -EINVAL;
482 goto out;
483 }
484 }
485
486 memcpy(joydev->abspam, abspam, len);
487
488 for (i = 0; i < joydev->nabs; i++)
489 joydev->absmap[joydev->abspam[i]] = i;
490
491 out:
492 kfree(abspam);
493 return retval;
494 }
495
496 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
497 void __user *argp, size_t len)
498 {
499 __u16 *keypam;
500 int i;
501 int retval = 0;
502
503 len = min(len, sizeof(joydev->keypam));
504
505 /* Validate the map. */
506 keypam = kmalloc(len, GFP_KERNEL);
507 if (!keypam)
508 return -ENOMEM;
509
510 if (copy_from_user(keypam, argp, len)) {
511 retval = -EFAULT;
512 goto out;
513 }
514
515 for (i = 0; i < joydev->nkey; i++) {
516 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
517 retval = -EINVAL;
518 goto out;
519 }
520 }
521
522 memcpy(joydev->keypam, keypam, len);
523
524 for (i = 0; i < joydev->nkey; i++)
525 joydev->keymap[keypam[i] - BTN_MISC] = i;
526
527 out:
528 kfree(keypam);
529 return retval;
530 }
531
532
533 static int joydev_ioctl_common(struct joydev *joydev,
534 unsigned int cmd, void __user *argp)
535 {
536 struct input_dev *dev = joydev->handle.dev;
537 size_t len;
538 int i;
539 const char *name;
540
541 /* Process fixed-sized commands. */
542 switch (cmd) {
543
544 case JS_SET_CAL:
545 return copy_from_user(&joydev->glue.JS_CORR, argp,
546 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
547
548 case JS_GET_CAL:
549 return copy_to_user(argp, &joydev->glue.JS_CORR,
550 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
551
552 case JS_SET_TIMEOUT:
553 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
554
555 case JS_GET_TIMEOUT:
556 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
557
558 case JSIOCGVERSION:
559 return put_user(JS_VERSION, (__u32 __user *) argp);
560
561 case JSIOCGAXES:
562 return put_user(joydev->nabs, (__u8 __user *) argp);
563
564 case JSIOCGBUTTONS:
565 return put_user(joydev->nkey, (__u8 __user *) argp);
566
567 case JSIOCSCORR:
568 if (copy_from_user(joydev->corr, argp,
569 sizeof(joydev->corr[0]) * joydev->nabs))
570 return -EFAULT;
571
572 for (i = 0; i < joydev->nabs; i++) {
573 int val = input_abs_get_val(dev, joydev->abspam[i]);
574 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
575 }
576 return 0;
577
578 case JSIOCGCORR:
579 return copy_to_user(argp, joydev->corr,
580 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
581
582 }
583
584 /*
585 * Process variable-sized commands (the axis and button map commands
586 * are considered variable-sized to decouple them from the values of
587 * ABS_MAX and KEY_MAX).
588 */
589 switch (cmd & ~IOCSIZE_MASK) {
590
591 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
592 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
593
594 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
595 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
596 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
597
598 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
599 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
600
601 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
602 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
603 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
604
605 case JSIOCGNAME(0):
606 name = dev->name;
607 if (!name)
608 return 0;
609
610 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
611 return copy_to_user(argp, name, len) ? -EFAULT : len;
612 }
613
614 return -EINVAL;
615 }
616
617 #ifdef CONFIG_COMPAT
618 static long joydev_compat_ioctl(struct file *file,
619 unsigned int cmd, unsigned long arg)
620 {
621 struct joydev_client *client = file->private_data;
622 struct joydev *joydev = client->joydev;
623 void __user *argp = (void __user *)arg;
624 s32 tmp32;
625 struct JS_DATA_SAVE_TYPE_32 ds32;
626 int retval;
627
628 retval = mutex_lock_interruptible(&joydev->mutex);
629 if (retval)
630 return retval;
631
632 if (!joydev->exist) {
633 retval = -ENODEV;
634 goto out;
635 }
636
637 switch (cmd) {
638
639 case JS_SET_TIMELIMIT:
640 retval = get_user(tmp32, (s32 __user *) arg);
641 if (retval == 0)
642 joydev->glue.JS_TIMELIMIT = tmp32;
643 break;
644
645 case JS_GET_TIMELIMIT:
646 tmp32 = joydev->glue.JS_TIMELIMIT;
647 retval = put_user(tmp32, (s32 __user *) arg);
648 break;
649
650 case JS_SET_ALL:
651 retval = copy_from_user(&ds32, argp,
652 sizeof(ds32)) ? -EFAULT : 0;
653 if (retval == 0) {
654 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
655 joydev->glue.BUSY = ds32.BUSY;
656 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
657 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
658 joydev->glue.JS_SAVE = ds32.JS_SAVE;
659 joydev->glue.JS_CORR = ds32.JS_CORR;
660 }
661 break;
662
663 case JS_GET_ALL:
664 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
665 ds32.BUSY = joydev->glue.BUSY;
666 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
667 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
668 ds32.JS_SAVE = joydev->glue.JS_SAVE;
669 ds32.JS_CORR = joydev->glue.JS_CORR;
670
671 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
672 break;
673
674 default:
675 retval = joydev_ioctl_common(joydev, cmd, argp);
676 break;
677 }
678
679 out:
680 mutex_unlock(&joydev->mutex);
681 return retval;
682 }
683 #endif /* CONFIG_COMPAT */
684
685 static long joydev_ioctl(struct file *file,
686 unsigned int cmd, unsigned long arg)
687 {
688 struct joydev_client *client = file->private_data;
689 struct joydev *joydev = client->joydev;
690 void __user *argp = (void __user *)arg;
691 int retval;
692
693 retval = mutex_lock_interruptible(&joydev->mutex);
694 if (retval)
695 return retval;
696
697 if (!joydev->exist) {
698 retval = -ENODEV;
699 goto out;
700 }
701
702 switch (cmd) {
703
704 case JS_SET_TIMELIMIT:
705 retval = get_user(joydev->glue.JS_TIMELIMIT,
706 (long __user *) arg);
707 break;
708
709 case JS_GET_TIMELIMIT:
710 retval = put_user(joydev->glue.JS_TIMELIMIT,
711 (long __user *) arg);
712 break;
713
714 case JS_SET_ALL:
715 retval = copy_from_user(&joydev->glue, argp,
716 sizeof(joydev->glue)) ? -EFAULT: 0;
717 break;
718
719 case JS_GET_ALL:
720 retval = copy_to_user(argp, &joydev->glue,
721 sizeof(joydev->glue)) ? -EFAULT : 0;
722 break;
723
724 default:
725 retval = joydev_ioctl_common(joydev, cmd, argp);
726 break;
727 }
728 out:
729 mutex_unlock(&joydev->mutex);
730 return retval;
731 }
732
733 static const struct file_operations joydev_fops = {
734 .owner = THIS_MODULE,
735 .read = joydev_read,
736 .poll = joydev_poll,
737 .open = joydev_open,
738 .release = joydev_release,
739 .unlocked_ioctl = joydev_ioctl,
740 #ifdef CONFIG_COMPAT
741 .compat_ioctl = joydev_compat_ioctl,
742 #endif
743 .fasync = joydev_fasync,
744 .llseek = no_llseek,
745 };
746
747 static int joydev_install_chrdev(struct joydev *joydev)
748 {
749 joydev_table[joydev->minor] = joydev;
750 return 0;
751 }
752
753 static void joydev_remove_chrdev(struct joydev *joydev)
754 {
755 mutex_lock(&joydev_table_mutex);
756 joydev_table[joydev->minor] = NULL;
757 mutex_unlock(&joydev_table_mutex);
758 }
759
760 /*
761 * Mark device non-existent. This disables writes, ioctls and
762 * prevents new users from opening the device. Already posted
763 * blocking reads will stay, however new ones will fail.
764 */
765 static void joydev_mark_dead(struct joydev *joydev)
766 {
767 mutex_lock(&joydev->mutex);
768 joydev->exist = false;
769 mutex_unlock(&joydev->mutex);
770 }
771
772 static void joydev_cleanup(struct joydev *joydev)
773 {
774 struct input_handle *handle = &joydev->handle;
775
776 joydev_mark_dead(joydev);
777 joydev_hangup(joydev);
778 joydev_remove_chrdev(joydev);
779
780 /* joydev is marked dead so no one else accesses joydev->open */
781 if (joydev->open)
782 input_close_device(handle);
783 }
784
785
786 static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
787 {
788 /* Avoid touchpads and touchscreens */
789 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
790 return false;
791
792 /* Avoid tablets, digitisers and similar devices */
793 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit))
794 return false;
795
796 return true;
797 }
798
799 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
800 const struct input_device_id *id)
801 {
802 struct joydev *joydev;
803 int i, j, t, minor;
804 int error;
805
806 for (minor = 0; minor < JOYDEV_MINORS; minor++)
807 if (!joydev_table[minor])
808 break;
809
810 if (minor == JOYDEV_MINORS) {
811 pr_err("no more free joydev devices\n");
812 return -ENFILE;
813 }
814
815 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
816 if (!joydev)
817 return -ENOMEM;
818
819 INIT_LIST_HEAD(&joydev->client_list);
820 spin_lock_init(&joydev->client_lock);
821 mutex_init(&joydev->mutex);
822 init_waitqueue_head(&joydev->wait);
823
824 dev_set_name(&joydev->dev, "js%d", minor);
825 joydev->exist = true;
826 joydev->minor = minor;
827
828 joydev->handle.dev = input_get_device(dev);
829 joydev->handle.name = dev_name(&joydev->dev);
830 joydev->handle.handler = handler;
831 joydev->handle.private = joydev;
832
833 for (i = 0; i < ABS_CNT; i++)
834 if (test_bit(i, dev->absbit)) {
835 joydev->absmap[i] = joydev->nabs;
836 joydev->abspam[joydev->nabs] = i;
837 joydev->nabs++;
838 }
839
840 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
841 if (test_bit(i + BTN_MISC, dev->keybit)) {
842 joydev->keymap[i] = joydev->nkey;
843 joydev->keypam[joydev->nkey] = i + BTN_MISC;
844 joydev->nkey++;
845 }
846
847 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
848 if (test_bit(i + BTN_MISC, dev->keybit)) {
849 joydev->keymap[i] = joydev->nkey;
850 joydev->keypam[joydev->nkey] = i + BTN_MISC;
851 joydev->nkey++;
852 }
853
854 for (i = 0; i < joydev->nabs; i++) {
855 j = joydev->abspam[i];
856 if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
857 joydev->corr[i].type = JS_CORR_NONE;
858 joydev->abs[i] = input_abs_get_val(dev, j);
859 continue;
860 }
861 joydev->corr[i].type = JS_CORR_BROKEN;
862 joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
863
864 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
865 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
866 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
867
868 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
869 - 2 * input_abs_get_flat(dev, j);
870 if (t) {
871 joydev->corr[i].coef[2] = (1 << 29) / t;
872 joydev->corr[i].coef[3] = (1 << 29) / t;
873
874 joydev->abs[i] =
875 joydev_correct(input_abs_get_val(dev, j),
876 joydev->corr + i);
877 }
878 }
879
880 joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
881 joydev->dev.class = &input_class;
882 joydev->dev.parent = &dev->dev;
883 joydev->dev.release = joydev_free;
884 device_initialize(&joydev->dev);
885
886 error = input_register_handle(&joydev->handle);
887 if (error)
888 goto err_free_joydev;
889
890 error = joydev_install_chrdev(joydev);
891 if (error)
892 goto err_unregister_handle;
893
894 error = device_add(&joydev->dev);
895 if (error)
896 goto err_cleanup_joydev;
897
898 return 0;
899
900 err_cleanup_joydev:
901 joydev_cleanup(joydev);
902 err_unregister_handle:
903 input_unregister_handle(&joydev->handle);
904 err_free_joydev:
905 put_device(&joydev->dev);
906 return error;
907 }
908
909 static void joydev_disconnect(struct input_handle *handle)
910 {
911 struct joydev *joydev = handle->private;
912
913 device_del(&joydev->dev);
914 joydev_cleanup(joydev);
915 input_unregister_handle(handle);
916 put_device(&joydev->dev);
917 }
918
919 static const struct input_device_id joydev_ids[] = {
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_X) },
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_WHEEL) },
931 },
932 {
933 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
934 INPUT_DEVICE_ID_MATCH_ABSBIT,
935 .evbit = { BIT_MASK(EV_ABS) },
936 .absbit = { BIT_MASK(ABS_THROTTLE) },
937 },
938 {
939 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
940 INPUT_DEVICE_ID_MATCH_KEYBIT,
941 .evbit = { BIT_MASK(EV_KEY) },
942 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
943 },
944 {
945 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
946 INPUT_DEVICE_ID_MATCH_KEYBIT,
947 .evbit = { BIT_MASK(EV_KEY) },
948 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
949 },
950 {
951 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
952 INPUT_DEVICE_ID_MATCH_KEYBIT,
953 .evbit = { BIT_MASK(EV_KEY) },
954 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
955 },
956 { } /* Terminating entry */
957 };
958
959 MODULE_DEVICE_TABLE(input, joydev_ids);
960
961 static struct input_handler joydev_handler = {
962 .event = joydev_event,
963 .match = joydev_match,
964 .connect = joydev_connect,
965 .disconnect = joydev_disconnect,
966 .fops = &joydev_fops,
967 .minor = JOYDEV_MINOR_BASE,
968 .name = "joydev",
969 .id_table = joydev_ids,
970 };
971
972 static int __init joydev_init(void)
973 {
974 return input_register_handler(&joydev_handler);
975 }
976
977 static void __exit joydev_exit(void)
978 {
979 input_unregister_handler(&joydev_handler);
980 }
981
982 module_init(joydev_init);
983 module_exit(joydev_exit);
linux-next