projects/linux·blob v4.5 · refs

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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 <linux/delay.h>
17#include <linux/errno.h>
18#include <linux/joystick.h>
19#include <linux/input.h>
20#include <linux/kernel.h>
21#include <linux/major.h>
22#include <linux/sched.h>
23#include <linux/slab.h>
24#include <linux/mm.h>
25#include <linux/miscdevice.h>
26#include <linux/module.h>
27#include <linux/poll.h>
28#include <linux/init.h>
29#include <linux/device.h>
30#include <linux/cdev.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 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 struct cdev cdev;
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 int joydev_correct(int value, struct js_corr *corr)
75{
76 switch (corr->type) {
77
78 case JS_CORR_NONE:
79 break;
80
81 case JS_CORR_BROKEN:
82 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
83 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
84 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
85 break;
86
87 default:
88 return 0;
89 }
90
91 return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
92}
93
94static void joydev_pass_event(struct joydev_client *client,
95 struct js_event *event)
96{
97 struct joydev *joydev = client->joydev;
98
99 /*
100 * IRQs already disabled, just acquire the lock
101 */
102 spin_lock(&client->buffer_lock);
103
104 client->buffer[client->head] = *event;
105
106 if (client->startup == joydev->nabs + joydev->nkey) {
107 client->head++;
108 client->head &= JOYDEV_BUFFER_SIZE - 1;
109 if (client->tail == client->head)
110 client->startup = 0;
111 }
112
113 spin_unlock(&client->buffer_lock);
114
115 kill_fasync(&client->fasync, SIGIO, POLL_IN);
116}
117
118static void joydev_event(struct input_handle *handle,
119 unsigned int type, unsigned int code, int value)
120{
121 struct joydev *joydev = handle->private;
122 struct joydev_client *client;
123 struct js_event event;
124
125 switch (type) {
126
127 case EV_KEY:
128 if (code < BTN_MISC || value == 2)
129 return;
130 event.type = JS_EVENT_BUTTON;
131 event.number = joydev->keymap[code - BTN_MISC];
132 event.value = value;
133 break;
134
135 case EV_ABS:
136 event.type = JS_EVENT_AXIS;
137 event.number = joydev->absmap[code];
138 event.value = joydev_correct(value,
139 &joydev->corr[event.number]);
140 if (event.value == joydev->abs[event.number])
141 return;
142 joydev->abs[event.number] = event.value;
143 break;
144
145 default:
146 return;
147 }
148
149 event.time = jiffies_to_msecs(jiffies);
150
151 rcu_read_lock();
152 list_for_each_entry_rcu(client, &joydev->client_list, node)
153 joydev_pass_event(client, &event);
154 rcu_read_unlock();
155
156 wake_up_interruptible(&joydev->wait);
157}
158
159static int joydev_fasync(int fd, struct file *file, int on)
160{
161 struct joydev_client *client = file->private_data;
162
163 return fasync_helper(fd, file, on, &client->fasync);
164}
165
166static void joydev_free(struct device *dev)
167{
168 struct joydev *joydev = container_of(dev, struct joydev, dev);
169
170 input_put_device(joydev->handle.dev);
171 kfree(joydev);
172}
173
174static void joydev_attach_client(struct joydev *joydev,
175 struct joydev_client *client)
176{
177 spin_lock(&joydev->client_lock);
178 list_add_tail_rcu(&client->node, &joydev->client_list);
179 spin_unlock(&joydev->client_lock);
180}
181
182static void joydev_detach_client(struct joydev *joydev,
183 struct joydev_client *client)
184{
185 spin_lock(&joydev->client_lock);
186 list_del_rcu(&client->node);
187 spin_unlock(&joydev->client_lock);
188 synchronize_rcu();
189}
190
191static int joydev_open_device(struct joydev *joydev)
192{
193 int retval;
194
195 retval = mutex_lock_interruptible(&joydev->mutex);
196 if (retval)
197 return retval;
198
199 if (!joydev->exist)
200 retval = -ENODEV;
201 else if (!joydev->open++) {
202 retval = input_open_device(&joydev->handle);
203 if (retval)
204 joydev->open--;
205 }
206
207 mutex_unlock(&joydev->mutex);
208 return retval;
209}
210
211static void joydev_close_device(struct joydev *joydev)
212{
213 mutex_lock(&joydev->mutex);
214
215 if (joydev->exist && !--joydev->open)
216 input_close_device(&joydev->handle);
217
218 mutex_unlock(&joydev->mutex);
219}
220
221/*
222 * Wake up users waiting for IO so they can disconnect from
223 * dead device.
224 */
225static void joydev_hangup(struct joydev *joydev)
226{
227 struct joydev_client *client;
228
229 spin_lock(&joydev->client_lock);
230 list_for_each_entry(client, &joydev->client_list, node)
231 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
232 spin_unlock(&joydev->client_lock);
233
234 wake_up_interruptible(&joydev->wait);
235}
236
237static int joydev_release(struct inode *inode, struct file *file)
238{
239 struct joydev_client *client = file->private_data;
240 struct joydev *joydev = client->joydev;
241
242 joydev_detach_client(joydev, client);
243 kfree(client);
244
245 joydev_close_device(joydev);
246
247 return 0;
248}
249
250static int joydev_open(struct inode *inode, struct file *file)
251{
252 struct joydev *joydev =
253 container_of(inode->i_cdev, struct joydev, cdev);
254 struct joydev_client *client;
255 int error;
256
257 client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
258 if (!client)
259 return -ENOMEM;
260
261 spin_lock_init(&client->buffer_lock);
262 client->joydev = joydev;
263 joydev_attach_client(joydev, client);
264
265 error = joydev_open_device(joydev);
266 if (error)
267 goto err_free_client;
268
269 file->private_data = client;
270 nonseekable_open(inode, file);
271
272 return 0;
273
274 err_free_client:
275 joydev_detach_client(joydev, client);
276 kfree(client);
277 return error;
278}
279
280static int joydev_generate_startup_event(struct joydev_client *client,
281 struct input_dev *input,
282 struct js_event *event)
283{
284 struct joydev *joydev = client->joydev;
285 int have_event;
286
287 spin_lock_irq(&client->buffer_lock);
288
289 have_event = client->startup < joydev->nabs + joydev->nkey;
290
291 if (have_event) {
292
293 event->time = jiffies_to_msecs(jiffies);
294 if (client->startup < joydev->nkey) {
295 event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
296 event->number = client->startup;
297 event->value = !!test_bit(joydev->keypam[event->number],
298 input->key);
299 } else {
300 event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
301 event->number = client->startup - joydev->nkey;
302 event->value = joydev->abs[event->number];
303 }
304 client->startup++;
305 }
306
307 spin_unlock_irq(&client->buffer_lock);
308
309 return have_event;
310}
311
312static int joydev_fetch_next_event(struct joydev_client *client,
313 struct js_event *event)
314{
315 int have_event;
316
317 spin_lock_irq(&client->buffer_lock);
318
319 have_event = client->head != client->tail;
320 if (have_event) {
321 *event = client->buffer[client->tail++];
322 client->tail &= JOYDEV_BUFFER_SIZE - 1;
323 }
324
325 spin_unlock_irq(&client->buffer_lock);
326
327 return have_event;
328}
329
330/*
331 * Old joystick interface
332 */
333static ssize_t joydev_0x_read(struct joydev_client *client,
334 struct input_dev *input,
335 char __user *buf)
336{
337 struct joydev *joydev = client->joydev;
338 struct JS_DATA_TYPE data;
339 int i;
340
341 spin_lock_irq(&input->event_lock);
342
343 /*
344 * Get device state
345 */
346 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
347 data.buttons |=
348 test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
349 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
350 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
351
352 /*
353 * Reset reader's event queue
354 */
355 spin_lock(&client->buffer_lock);
356 client->startup = 0;
357 client->tail = client->head;
358 spin_unlock(&client->buffer_lock);
359
360 spin_unlock_irq(&input->event_lock);
361
362 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
363 return -EFAULT;
364
365 return sizeof(struct JS_DATA_TYPE);
366}
367
368static inline int joydev_data_pending(struct joydev_client *client)
369{
370 struct joydev *joydev = client->joydev;
371
372 return client->startup < joydev->nabs + joydev->nkey ||
373 client->head != client->tail;
374}
375
376static ssize_t joydev_read(struct file *file, char __user *buf,
377 size_t count, loff_t *ppos)
378{
379 struct joydev_client *client = file->private_data;
380 struct joydev *joydev = client->joydev;
381 struct input_dev *input = joydev->handle.dev;
382 struct js_event event;
383 int retval;
384
385 if (!joydev->exist)
386 return -ENODEV;
387
388 if (count < sizeof(struct js_event))
389 return -EINVAL;
390
391 if (count == sizeof(struct JS_DATA_TYPE))
392 return joydev_0x_read(client, input, buf);
393
394 if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
395 return -EAGAIN;
396
397 retval = wait_event_interruptible(joydev->wait,
398 !joydev->exist || joydev_data_pending(client));
399 if (retval)
400 return retval;
401
402 if (!joydev->exist)
403 return -ENODEV;
404
405 while (retval + sizeof(struct js_event) <= count &&
406 joydev_generate_startup_event(client, input, &event)) {
407
408 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
409 return -EFAULT;
410
411 retval += sizeof(struct js_event);
412 }
413
414 while (retval + sizeof(struct js_event) <= count &&
415 joydev_fetch_next_event(client, &event)) {
416
417 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
418 return -EFAULT;
419
420 retval += sizeof(struct js_event);
421 }
422
423 return retval;
424}
425
426/* No kernel lock - fine */
427static unsigned int joydev_poll(struct file *file, poll_table *wait)
428{
429 struct joydev_client *client = file->private_data;
430 struct joydev *joydev = client->joydev;
431
432 poll_wait(file, &joydev->wait, wait);
433 return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
434 (joydev->exist ? 0 : (POLLHUP | POLLERR));
435}
436
437static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
438 void __user *argp, size_t len)
439{
440 __u8 *abspam;
441 int i;
442 int retval = 0;
443
444 len = min(len, sizeof(joydev->abspam));
445
446 /* Validate the map. */
447 abspam = memdup_user(argp, len);
448 if (IS_ERR(abspam))
449 return PTR_ERR(abspam);
450
451 for (i = 0; i < joydev->nabs; i++) {
452 if (abspam[i] > ABS_MAX) {
453 retval = -EINVAL;
454 goto out;
455 }
456 }
457
458 memcpy(joydev->abspam, abspam, len);
459
460 for (i = 0; i < joydev->nabs; i++)
461 joydev->absmap[joydev->abspam[i]] = i;
462
463 out:
464 kfree(abspam);
465 return retval;
466}
467
468static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
469 void __user *argp, size_t len)
470{
471 __u16 *keypam;
472 int i;
473 int retval = 0;
474
475 len = min(len, sizeof(joydev->keypam));
476
477 /* Validate the map. */
478 keypam = memdup_user(argp, len);
479 if (IS_ERR(keypam))
480 return PTR_ERR(keypam);
481
482 for (i = 0; i < joydev->nkey; i++) {
483 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
484 retval = -EINVAL;
485 goto out;
486 }
487 }
488
489 memcpy(joydev->keypam, keypam, len);
490
491 for (i = 0; i < joydev->nkey; i++)
492 joydev->keymap[keypam[i] - BTN_MISC] = i;
493
494 out:
495 kfree(keypam);
496 return retval;
497}
498
499
500static int joydev_ioctl_common(struct joydev *joydev,
501 unsigned int cmd, void __user *argp)
502{
503 struct input_dev *dev = joydev->handle.dev;
504 size_t len;
505 int i;
506 const char *name;
507
508 /* Process fixed-sized commands. */
509 switch (cmd) {
510
511 case JS_SET_CAL:
512 return copy_from_user(&joydev->glue.JS_CORR, argp,
513 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
514
515 case JS_GET_CAL:
516 return copy_to_user(argp, &joydev->glue.JS_CORR,
517 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
518
519 case JS_SET_TIMEOUT:
520 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
521
522 case JS_GET_TIMEOUT:
523 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
524
525 case JSIOCGVERSION:
526 return put_user(JS_VERSION, (__u32 __user *) argp);
527
528 case JSIOCGAXES:
529 return put_user(joydev->nabs, (__u8 __user *) argp);
530
531 case JSIOCGBUTTONS:
532 return put_user(joydev->nkey, (__u8 __user *) argp);
533
534 case JSIOCSCORR:
535 if (copy_from_user(joydev->corr, argp,
536 sizeof(joydev->corr[0]) * joydev->nabs))
537 return -EFAULT;
538
539 for (i = 0; i < joydev->nabs; i++) {
540 int val = input_abs_get_val(dev, joydev->abspam[i]);
541 joydev->abs[i] = joydev_correct(val, &joydev->corr[i]);
542 }
543 return 0;
544
545 case JSIOCGCORR:
546 return copy_to_user(argp, joydev->corr,
547 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
548
549 }
550
551 /*
552 * Process variable-sized commands (the axis and button map commands
553 * are considered variable-sized to decouple them from the values of
554 * ABS_MAX and KEY_MAX).
555 */
556 switch (cmd & ~IOCSIZE_MASK) {
557
558 case (JSIOCSAXMAP & ~IOCSIZE_MASK):
559 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
560
561 case (JSIOCGAXMAP & ~IOCSIZE_MASK):
562 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
563 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
564
565 case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
566 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
567
568 case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
569 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
570 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
571
572 case JSIOCGNAME(0):
573 name = dev->name;
574 if (!name)
575 return 0;
576
577 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
578 return copy_to_user(argp, name, len) ? -EFAULT : len;
579 }
580
581 return -EINVAL;
582}
583
584#ifdef CONFIG_COMPAT
585static long joydev_compat_ioctl(struct file *file,
586 unsigned int cmd, unsigned long arg)
587{
588 struct joydev_client *client = file->private_data;
589 struct joydev *joydev = client->joydev;
590 void __user *argp = (void __user *)arg;
591 s32 tmp32;
592 struct JS_DATA_SAVE_TYPE_32 ds32;
593 int retval;
594
595 retval = mutex_lock_interruptible(&joydev->mutex);
596 if (retval)
597 return retval;
598
599 if (!joydev->exist) {
600 retval = -ENODEV;
601 goto out;
602 }
603
604 switch (cmd) {
605
606 case JS_SET_TIMELIMIT:
607 retval = get_user(tmp32, (s32 __user *) arg);
608 if (retval == 0)
609 joydev->glue.JS_TIMELIMIT = tmp32;
610 break;
611
612 case JS_GET_TIMELIMIT:
613 tmp32 = joydev->glue.JS_TIMELIMIT;
614 retval = put_user(tmp32, (s32 __user *) arg);
615 break;
616
617 case JS_SET_ALL:
618 retval = copy_from_user(&ds32, argp,
619 sizeof(ds32)) ? -EFAULT : 0;
620 if (retval == 0) {
621 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
622 joydev->glue.BUSY = ds32.BUSY;
623 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
624 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
625 joydev->glue.JS_SAVE = ds32.JS_SAVE;
626 joydev->glue.JS_CORR = ds32.JS_CORR;
627 }
628 break;
629
630 case JS_GET_ALL:
631 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
632 ds32.BUSY = joydev->glue.BUSY;
633 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
634 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
635 ds32.JS_SAVE = joydev->glue.JS_SAVE;
636 ds32.JS_CORR = joydev->glue.JS_CORR;
637
638 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
639 break;
640
641 default:
642 retval = joydev_ioctl_common(joydev, cmd, argp);
643 break;
644 }
645
646 out:
647 mutex_unlock(&joydev->mutex);
648 return retval;
649}
650#endif /* CONFIG_COMPAT */
651
652static long joydev_ioctl(struct file *file,
653 unsigned int cmd, unsigned long arg)
654{
655 struct joydev_client *client = file->private_data;
656 struct joydev *joydev = client->joydev;
657 void __user *argp = (void __user *)arg;
658 int retval;
659
660 retval = mutex_lock_interruptible(&joydev->mutex);
661 if (retval)
662 return retval;
663
664 if (!joydev->exist) {
665 retval = -ENODEV;
666 goto out;
667 }
668
669 switch (cmd) {
670
671 case JS_SET_TIMELIMIT:
672 retval = get_user(joydev->glue.JS_TIMELIMIT,
673 (long __user *) arg);
674 break;
675
676 case JS_GET_TIMELIMIT:
677 retval = put_user(joydev->glue.JS_TIMELIMIT,
678 (long __user *) arg);
679 break;
680
681 case JS_SET_ALL:
682 retval = copy_from_user(&joydev->glue, argp,
683 sizeof(joydev->glue)) ? -EFAULT : 0;
684 break;
685
686 case JS_GET_ALL:
687 retval = copy_to_user(argp, &joydev->glue,
688 sizeof(joydev->glue)) ? -EFAULT : 0;
689 break;
690
691 default:
692 retval = joydev_ioctl_common(joydev, cmd, argp);
693 break;
694 }
695 out:
696 mutex_unlock(&joydev->mutex);
697 return retval;
698}
699
700static const struct file_operations joydev_fops = {
701 .owner = THIS_MODULE,
702 .read = joydev_read,
703 .poll = joydev_poll,
704 .open = joydev_open,
705 .release = joydev_release,
706 .unlocked_ioctl = joydev_ioctl,
707#ifdef CONFIG_COMPAT
708 .compat_ioctl = joydev_compat_ioctl,
709#endif
710 .fasync = joydev_fasync,
711 .llseek = no_llseek,
712};
713
714/*
715 * Mark device non-existent. This disables writes, ioctls and
716 * prevents new users from opening the device. Already posted
717 * blocking reads will stay, however new ones will fail.
718 */
719static void joydev_mark_dead(struct joydev *joydev)
720{
721 mutex_lock(&joydev->mutex);
722 joydev->exist = false;
723 mutex_unlock(&joydev->mutex);
724}
725
726static void joydev_cleanup(struct joydev *joydev)
727{
728 struct input_handle *handle = &joydev->handle;
729
730 joydev_mark_dead(joydev);
731 joydev_hangup(joydev);
732
733 cdev_del(&joydev->cdev);
734
735 /* joydev is marked dead so no one else accesses joydev->open */
736 if (joydev->open)
737 input_close_device(handle);
738}
739
740static bool joydev_dev_is_absolute_mouse(struct input_dev *dev)
741{
742 DECLARE_BITMAP(jd_scratch, KEY_CNT);
743
744 BUILD_BUG_ON(ABS_CNT > KEY_CNT || EV_CNT > KEY_CNT);
745
746 /*
747 * Virtualization (VMware, etc) and remote management (HP
748 * ILO2) solutions use absolute coordinates for their virtual
749 * pointing devices so that there is one-to-one relationship
750 * between pointer position on the host screen and virtual
751 * guest screen, and so their mice use ABS_X, ABS_Y and 3
752 * primary button events. This clashes with what joydev
753 * considers to be joysticks (a device with at minimum ABS_X
754 * axis).
755 *
756 * Here we are trying to separate absolute mice from
757 * joysticks. A device is, for joystick detection purposes,
758 * considered to be an absolute mouse if the following is
759 * true:
760 *
761 * 1) Event types are exactly EV_ABS, EV_KEY and EV_SYN.
762 * 2) Absolute events are exactly ABS_X and ABS_Y.
763 * 3) Keys are exactly BTN_LEFT, BTN_RIGHT and BTN_MIDDLE.
764 * 4) Device is not on "Amiga" bus.
765 */
766
767 bitmap_zero(jd_scratch, EV_CNT);
768 __set_bit(EV_ABS, jd_scratch);
769 __set_bit(EV_KEY, jd_scratch);
770 __set_bit(EV_SYN, jd_scratch);
771 if (!bitmap_equal(jd_scratch, dev->evbit, EV_CNT))
772 return false;
773
774 bitmap_zero(jd_scratch, ABS_CNT);
775 __set_bit(ABS_X, jd_scratch);
776 __set_bit(ABS_Y, jd_scratch);
777 if (!bitmap_equal(dev->absbit, jd_scratch, ABS_CNT))
778 return false;
779
780 bitmap_zero(jd_scratch, KEY_CNT);
781 __set_bit(BTN_LEFT, jd_scratch);
782 __set_bit(BTN_RIGHT, jd_scratch);
783 __set_bit(BTN_MIDDLE, jd_scratch);
784
785 if (!bitmap_equal(dev->keybit, jd_scratch, KEY_CNT))
786 return false;
787
788 /*
789 * Amiga joystick (amijoy) historically uses left/middle/right
790 * button events.
791 */
792 if (dev->id.bustype == BUS_AMIGA)
793 return false;
794
795 return true;
796}
797
798static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
799{
800 /* Avoid touchpads and touchscreens */
801 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
802 return false;
803
804 /* Avoid tablets, digitisers and similar devices */
805 if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit))
806 return false;
807
808 /* Avoid absolute mice */
809 if (joydev_dev_is_absolute_mouse(dev))
810 return false;
811
812 return true;
813}
814
815static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
816 const struct input_device_id *id)
817{
818 struct joydev *joydev;
819 int i, j, t, minor, dev_no;
820 int error;
821
822 minor = input_get_new_minor(JOYDEV_MINOR_BASE, JOYDEV_MINORS, true);
823 if (minor < 0) {
824 error = minor;
825 pr_err("failed to reserve new minor: %d\n", error);
826 return error;
827 }
828
829 joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
830 if (!joydev) {
831 error = -ENOMEM;
832 goto err_free_minor;
833 }
834
835 INIT_LIST_HEAD(&joydev->client_list);
836 spin_lock_init(&joydev->client_lock);
837 mutex_init(&joydev->mutex);
838 init_waitqueue_head(&joydev->wait);
839 joydev->exist = true;
840
841 dev_no = minor;
842 /* Normalize device number if it falls into legacy range */
843 if (dev_no < JOYDEV_MINOR_BASE + JOYDEV_MINORS)
844 dev_no -= JOYDEV_MINOR_BASE;
845 dev_set_name(&joydev->dev, "js%d", dev_no);
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_each_set_bit(i, dev->absbit, ABS_CNT) {
853 joydev->absmap[i] = joydev->nabs;
854 joydev->abspam[joydev->nabs] = i;
855 joydev->nabs++;
856 }
857
858 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
859 if (test_bit(i + BTN_MISC, dev->keybit)) {
860 joydev->keymap[i] = joydev->nkey;
861 joydev->keypam[joydev->nkey] = i + BTN_MISC;
862 joydev->nkey++;
863 }
864
865 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
866 if (test_bit(i + BTN_MISC, dev->keybit)) {
867 joydev->keymap[i] = joydev->nkey;
868 joydev->keypam[joydev->nkey] = i + BTN_MISC;
869 joydev->nkey++;
870 }
871
872 for (i = 0; i < joydev->nabs; i++) {
873 j = joydev->abspam[i];
874 if (input_abs_get_max(dev, j) == input_abs_get_min(dev, j)) {
875 joydev->corr[i].type = JS_CORR_NONE;
876 joydev->abs[i] = input_abs_get_val(dev, j);
877 continue;
878 }
879 joydev->corr[i].type = JS_CORR_BROKEN;
880 joydev->corr[i].prec = input_abs_get_fuzz(dev, j);
881
882 t = (input_abs_get_max(dev, j) + input_abs_get_min(dev, j)) / 2;
883 joydev->corr[i].coef[0] = t - input_abs_get_flat(dev, j);
884 joydev->corr[i].coef[1] = t + input_abs_get_flat(dev, j);
885
886 t = (input_abs_get_max(dev, j) - input_abs_get_min(dev, j)) / 2
887 - 2 * input_abs_get_flat(dev, j);
888 if (t) {
889 joydev->corr[i].coef[2] = (1 << 29) / t;
890 joydev->corr[i].coef[3] = (1 << 29) / t;
891
892 joydev->abs[i] =
893 joydev_correct(input_abs_get_val(dev, j),
894 joydev->corr + i);
895 }
896 }
897
898 joydev->dev.devt = MKDEV(INPUT_MAJOR, minor);
899 joydev->dev.class = &input_class;
900 joydev->dev.parent = &dev->dev;
901 joydev->dev.release = joydev_free;
902 device_initialize(&joydev->dev);
903
904 error = input_register_handle(&joydev->handle);
905 if (error)
906 goto err_free_joydev;
907
908 cdev_init(&joydev->cdev, &joydev_fops);
909 joydev->cdev.kobj.parent = &joydev->dev.kobj;
910 error = cdev_add(&joydev->cdev, joydev->dev.devt, 1);
911 if (error)
912 goto err_unregister_handle;
913
914 error = device_add(&joydev->dev);
915 if (error)
916 goto err_cleanup_joydev;
917
918 return 0;
919
920 err_cleanup_joydev:
921 joydev_cleanup(joydev);
922 err_unregister_handle:
923 input_unregister_handle(&joydev->handle);
924 err_free_joydev:
925 put_device(&joydev->dev);
926 err_free_minor:
927 input_free_minor(minor);
928 return error;
929}
930
931static void joydev_disconnect(struct input_handle *handle)
932{
933 struct joydev *joydev = handle->private;
934
935 device_del(&joydev->dev);
936 joydev_cleanup(joydev);
937 input_free_minor(MINOR(joydev->dev.devt));
938 input_unregister_handle(handle);
939 put_device(&joydev->dev);
940}
941
942static const struct input_device_id joydev_ids[] = {
943 {
944 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
945 INPUT_DEVICE_ID_MATCH_ABSBIT,
946 .evbit = { BIT_MASK(EV_ABS) },
947 .absbit = { BIT_MASK(ABS_X) },
948 },
949 {
950 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
951 INPUT_DEVICE_ID_MATCH_ABSBIT,
952 .evbit = { BIT_MASK(EV_ABS) },
953 .absbit = { BIT_MASK(ABS_WHEEL) },
954 },
955 {
956 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
957 INPUT_DEVICE_ID_MATCH_ABSBIT,
958 .evbit = { BIT_MASK(EV_ABS) },
959 .absbit = { BIT_MASK(ABS_THROTTLE) },
960 },
961 {
962 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
963 INPUT_DEVICE_ID_MATCH_KEYBIT,
964 .evbit = { BIT_MASK(EV_KEY) },
965 .keybit = {[BIT_WORD(BTN_JOYSTICK)] = BIT_MASK(BTN_JOYSTICK) },
966 },
967 {
968 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
969 INPUT_DEVICE_ID_MATCH_KEYBIT,
970 .evbit = { BIT_MASK(EV_KEY) },
971 .keybit = { [BIT_WORD(BTN_GAMEPAD)] = BIT_MASK(BTN_GAMEPAD) },
972 },
973 {
974 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
975 INPUT_DEVICE_ID_MATCH_KEYBIT,
976 .evbit = { BIT_MASK(EV_KEY) },
977 .keybit = { [BIT_WORD(BTN_TRIGGER_HAPPY)] = BIT_MASK(BTN_TRIGGER_HAPPY) },
978 },
979 { } /* Terminating entry */
980};
981
982MODULE_DEVICE_TABLE(input, joydev_ids);
983
984static struct input_handler joydev_handler = {
985 .event = joydev_event,
986 .match = joydev_match,
987 .connect = joydev_connect,
988 .disconnect = joydev_disconnect,
989 .legacy_minors = true,
990 .minor = JOYDEV_MINOR_BASE,
991 .name = "joydev",
992 .id_table = joydev_ids,
993};
994
995static int __init joydev_init(void)
996{
997 return input_register_handler(&joydev_handler);
998}
999
1000static void __exit joydev_exit(void)
1001{
1002 input_unregister_handler(&joydev_handler);
1003}
1004
1005module_init(joydev_init);
1006module_exit(joydev_exit);