SH: remove superfluous warning from the serial driver
[linux-2.6.git] / drivers / input / joydev.c
1 /*
2  * Joystick device driver for the input driver suite.
3  *
4  * Copyright (c) 1999-2002 Vojtech Pavlik
5  * Copyright (c) 1999 Colin Van Dyke
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  */
12
13 #include <asm/io.h>
14 #include <asm/system.h>
15 #include <linux/delay.h>
16 #include <linux/errno.h>
17 #include <linux/joystick.h>
18 #include <linux/input.h>
19 #include <linux/kernel.h>
20 #include <linux/major.h>
21 #include <linux/sched.h>
22 #include <linux/slab.h>
23 #include <linux/mm.h>
24 #include <linux/miscdevice.h>
25 #include <linux/module.h>
26 #include <linux/poll.h>
27 #include <linux/init.h>
28 #include <linux/device.h>
29
30 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
31 MODULE_DESCRIPTION("Joystick device interfaces");
32 MODULE_SUPPORTED_DEVICE("input/js");
33 MODULE_LICENSE("GPL");
34
35 #define JOYDEV_MINOR_BASE       0
36 #define JOYDEV_MINORS           16
37 #define JOYDEV_BUFFER_SIZE      64
38
39 struct joydev {
40         int exist;
41         int open;
42         int minor;
43         struct input_handle handle;
44         wait_queue_head_t wait;
45         struct list_head client_list;
46         spinlock_t client_lock; /* protects client_list */
47         struct mutex mutex;
48         struct device dev;
49
50         struct js_corr corr[ABS_MAX + 1];
51         struct JS_DATA_SAVE_TYPE glue;
52         int nabs;
53         int nkey;
54         __u16 keymap[KEY_MAX - BTN_MISC + 1];
55         __u16 keypam[KEY_MAX - BTN_MISC + 1];
56         __u8 absmap[ABS_MAX + 1];
57         __u8 abspam[ABS_MAX + 1];
58         __s16 abs[ABS_MAX + 1];
59 };
60
61 struct joydev_client {
62         struct js_event buffer[JOYDEV_BUFFER_SIZE];
63         int head;
64         int tail;
65         int startup;
66         spinlock_t buffer_lock; /* protects access to buffer, head and tail */
67         struct fasync_struct *fasync;
68         struct joydev *joydev;
69         struct list_head node;
70 };
71
72 static struct joydev *joydev_table[JOYDEV_MINORS];
73 static DEFINE_MUTEX(joydev_table_mutex);
74
75 static int joydev_correct(int value, struct js_corr *corr)
76 {
77         switch (corr->type) {
78
79         case JS_CORR_NONE:
80                 break;
81
82         case JS_CORR_BROKEN:
83                 value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
84                         ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
85                         ((corr->coef[2] * (value - corr->coef[0])) >> 14);
86                 break;
87
88         default:
89                 return 0;
90         }
91
92         return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
93 }
94
95 static void joydev_pass_event(struct joydev_client *client,
96                               struct js_event *event)
97 {
98         struct joydev *joydev = client->joydev;
99
100         /*
101          * IRQs already disabled, just acquire the lock
102          */
103         spin_lock(&client->buffer_lock);
104
105         client->buffer[client->head] = *event;
106
107         if (client->startup == joydev->nabs + joydev->nkey) {
108                 client->head++;
109                 client->head &= JOYDEV_BUFFER_SIZE - 1;
110                 if (client->tail == client->head)
111                         client->startup = 0;
112         }
113
114         spin_unlock(&client->buffer_lock);
115
116         kill_fasync(&client->fasync, SIGIO, POLL_IN);
117 }
118
119 static void joydev_event(struct input_handle *handle,
120                          unsigned int type, unsigned int code, int value)
121 {
122         struct joydev *joydev = handle->private;
123         struct joydev_client *client;
124         struct js_event event;
125
126         switch (type) {
127
128         case EV_KEY:
129                 if (code < BTN_MISC || value == 2)
130                         return;
131                 event.type = JS_EVENT_BUTTON;
132                 event.number = joydev->keymap[code - BTN_MISC];
133                 event.value = value;
134                 break;
135
136         case EV_ABS:
137                 event.type = JS_EVENT_AXIS;
138                 event.number = joydev->absmap[code];
139                 event.value = joydev_correct(value,
140                                         &joydev->corr[event.number]);
141                 if (event.value == joydev->abs[event.number])
142                         return;
143                 joydev->abs[event.number] = event.value;
144                 break;
145
146         default:
147                 return;
148         }
149
150         event.time = jiffies_to_msecs(jiffies);
151
152         rcu_read_lock();
153         list_for_each_entry_rcu(client, &joydev->client_list, node)
154                 joydev_pass_event(client, &event);
155         rcu_read_unlock();
156
157         wake_up_interruptible(&joydev->wait);
158 }
159
160 static int joydev_fasync(int fd, struct file *file, int on)
161 {
162         struct joydev_client *client = file->private_data;
163
164         return fasync_helper(fd, file, on, &client->fasync);
165 }
166
167 static void joydev_free(struct device *dev)
168 {
169         struct joydev *joydev = container_of(dev, struct joydev, dev);
170
171         input_put_device(joydev->handle.dev);
172         kfree(joydev);
173 }
174
175 static void joydev_attach_client(struct joydev *joydev,
176                                  struct joydev_client *client)
177 {
178         spin_lock(&joydev->client_lock);
179         list_add_tail_rcu(&client->node, &joydev->client_list);
180         spin_unlock(&joydev->client_lock);
181         synchronize_rcu();
182 }
183
184 static void joydev_detach_client(struct joydev *joydev,
185                                  struct joydev_client *client)
186 {
187         spin_lock(&joydev->client_lock);
188         list_del_rcu(&client->node);
189         spin_unlock(&joydev->client_lock);
190         synchronize_rcu();
191 }
192
193 static int joydev_open_device(struct joydev *joydev)
194 {
195         int retval;
196
197         retval = mutex_lock_interruptible(&joydev->mutex);
198         if (retval)
199                 return retval;
200
201         if (!joydev->exist)
202                 retval = -ENODEV;
203         else if (!joydev->open++) {
204                 retval = input_open_device(&joydev->handle);
205                 if (retval)
206                         joydev->open--;
207         }
208
209         mutex_unlock(&joydev->mutex);
210         return retval;
211 }
212
213 static void joydev_close_device(struct joydev *joydev)
214 {
215         mutex_lock(&joydev->mutex);
216
217         if (joydev->exist && !--joydev->open)
218                 input_close_device(&joydev->handle);
219
220         mutex_unlock(&joydev->mutex);
221 }
222
223 /*
224  * Wake up users waiting for IO so they can disconnect from
225  * dead device.
226  */
227 static void joydev_hangup(struct joydev *joydev)
228 {
229         struct joydev_client *client;
230
231         spin_lock(&joydev->client_lock);
232         list_for_each_entry(client, &joydev->client_list, node)
233                 kill_fasync(&client->fasync, SIGIO, POLL_HUP);
234         spin_unlock(&joydev->client_lock);
235
236         wake_up_interruptible(&joydev->wait);
237 }
238
239 static int joydev_release(struct inode *inode, struct file *file)
240 {
241         struct joydev_client *client = file->private_data;
242         struct joydev *joydev = client->joydev;
243
244         joydev_detach_client(joydev, client);
245         kfree(client);
246
247         joydev_close_device(joydev);
248         put_device(&joydev->dev);
249
250         return 0;
251 }
252
253 static int joydev_open(struct inode *inode, struct file *file)
254 {
255         struct joydev_client *client;
256         struct joydev *joydev;
257         int i = iminor(inode) - JOYDEV_MINOR_BASE;
258         int error;
259
260         if (i >= JOYDEV_MINORS)
261                 return -ENODEV;
262
263         error = mutex_lock_interruptible(&joydev_table_mutex);
264         if (error)
265                 return error;
266         joydev = joydev_table[i];
267         if (joydev)
268                 get_device(&joydev->dev);
269         mutex_unlock(&joydev_table_mutex);
270
271         if (!joydev)
272                 return -ENODEV;
273
274         client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
275         if (!client) {
276                 error = -ENOMEM;
277                 goto err_put_joydev;
278         }
279
280         spin_lock_init(&client->buffer_lock);
281         client->joydev = joydev;
282         joydev_attach_client(joydev, client);
283
284         error = joydev_open_device(joydev);
285         if (error)
286                 goto err_free_client;
287
288         file->private_data = client;
289         nonseekable_open(inode, file);
290
291         return 0;
292
293  err_free_client:
294         joydev_detach_client(joydev, client);
295         kfree(client);
296  err_put_joydev:
297         put_device(&joydev->dev);
298         return error;
299 }
300
301 static int joydev_generate_startup_event(struct joydev_client *client,
302                                          struct input_dev *input,
303                                          struct js_event *event)
304 {
305         struct joydev *joydev = client->joydev;
306         int have_event;
307
308         spin_lock_irq(&client->buffer_lock);
309
310         have_event = client->startup < joydev->nabs + joydev->nkey;
311
312         if (have_event) {
313
314                 event->time = jiffies_to_msecs(jiffies);
315                 if (client->startup < joydev->nkey) {
316                         event->type = JS_EVENT_BUTTON | JS_EVENT_INIT;
317                         event->number = client->startup;
318                         event->value = !!test_bit(joydev->keypam[event->number],
319                                                   input->key);
320                 } else {
321                         event->type = JS_EVENT_AXIS | JS_EVENT_INIT;
322                         event->number = client->startup - joydev->nkey;
323                         event->value = joydev->abs[event->number];
324                 }
325                 client->startup++;
326         }
327
328         spin_unlock_irq(&client->buffer_lock);
329
330         return have_event;
331 }
332
333 static int joydev_fetch_next_event(struct joydev_client *client,
334                                    struct js_event *event)
335 {
336         int have_event;
337
338         spin_lock_irq(&client->buffer_lock);
339
340         have_event = client->head != client->tail;
341         if (have_event) {
342                 *event = client->buffer[client->tail++];
343                 client->tail &= JOYDEV_BUFFER_SIZE - 1;
344         }
345
346         spin_unlock_irq(&client->buffer_lock);
347
348         return have_event;
349 }
350
351 /*
352  * Old joystick interface
353  */
354 static ssize_t joydev_0x_read(struct joydev_client *client,
355                               struct input_dev *input,
356                               char __user *buf)
357 {
358         struct joydev *joydev = client->joydev;
359         struct JS_DATA_TYPE data;
360         int i;
361
362         spin_lock_irq(&input->event_lock);
363
364         /*
365          * Get device state
366          */
367         for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
368                 data.buttons |=
369                         test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
370         data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
371         data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
372
373         /*
374          * Reset reader's event queue
375          */
376         spin_lock(&client->buffer_lock);
377         client->startup = 0;
378         client->tail = client->head;
379         spin_unlock(&client->buffer_lock);
380
381         spin_unlock_irq(&input->event_lock);
382
383         if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
384                 return -EFAULT;
385
386         return sizeof(struct JS_DATA_TYPE);
387 }
388
389 static inline int joydev_data_pending(struct joydev_client *client)
390 {
391         struct joydev *joydev = client->joydev;
392
393         return client->startup < joydev->nabs + joydev->nkey ||
394                 client->head != client->tail;
395 }
396
397 static ssize_t joydev_read(struct file *file, char __user *buf,
398                            size_t count, loff_t *ppos)
399 {
400         struct joydev_client *client = file->private_data;
401         struct joydev *joydev = client->joydev;
402         struct input_dev *input = joydev->handle.dev;
403         struct js_event event;
404         int retval;
405
406         if (!joydev->exist)
407                 return -ENODEV;
408
409         if (count < sizeof(struct js_event))
410                 return -EINVAL;
411
412         if (count == sizeof(struct JS_DATA_TYPE))
413                 return joydev_0x_read(client, input, buf);
414
415         if (!joydev_data_pending(client) && (file->f_flags & O_NONBLOCK))
416                 return -EAGAIN;
417
418         retval = wait_event_interruptible(joydev->wait,
419                         !joydev->exist || joydev_data_pending(client));
420         if (retval)
421                 return retval;
422
423         if (!joydev->exist)
424                 return -ENODEV;
425
426         while (retval + sizeof(struct js_event) <= count &&
427                joydev_generate_startup_event(client, input, &event)) {
428
429                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
430                         return -EFAULT;
431
432                 retval += sizeof(struct js_event);
433         }
434
435         while (retval + sizeof(struct js_event) <= count &&
436                joydev_fetch_next_event(client, &event)) {
437
438                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
439                         return -EFAULT;
440
441                 retval += sizeof(struct js_event);
442         }
443
444         return retval;
445 }
446
447 /* No kernel lock - fine */
448 static unsigned int joydev_poll(struct file *file, poll_table *wait)
449 {
450         struct joydev_client *client = file->private_data;
451         struct joydev *joydev = client->joydev;
452
453         poll_wait(file, &joydev->wait, wait);
454         return (joydev_data_pending(client) ? (POLLIN | POLLRDNORM) : 0) |
455                 (joydev->exist ?  0 : (POLLHUP | POLLERR));
456 }
457
458 static int joydev_handle_JSIOCSAXMAP(struct joydev *joydev,
459                                      void __user *argp, size_t len)
460 {
461         __u8 *abspam;
462         int i;
463         int retval = 0;
464
465         len = min(len, sizeof(joydev->abspam));
466
467         /* Validate the map. */
468         abspam = kmalloc(len, GFP_KERNEL);
469         if (!abspam)
470                 return -ENOMEM;
471
472         if (copy_from_user(abspam, argp, len)) {
473                 retval = -EFAULT;
474                 goto out;
475         }
476
477         for (i = 0; i < joydev->nabs; i++) {
478                 if (abspam[i] > ABS_MAX) {
479                         retval = -EINVAL;
480                         goto out;
481                 }
482         }
483
484         memcpy(joydev->abspam, abspam, len);
485
486  out:
487         kfree(abspam);
488         return retval;
489 }
490
491 static int joydev_handle_JSIOCSBTNMAP(struct joydev *joydev,
492                                       void __user *argp, size_t len)
493 {
494         __u16 *keypam;
495         int i;
496         int retval = 0;
497
498         len = min(len, sizeof(joydev->keypam));
499
500         /* Validate the map. */
501         keypam = kmalloc(len, GFP_KERNEL);
502         if (!keypam)
503                 return -ENOMEM;
504
505         if (copy_from_user(keypam, argp, len)) {
506                 retval = -EFAULT;
507                 goto out;
508         }
509
510         for (i = 0; i < joydev->nkey; i++) {
511                 if (keypam[i] > KEY_MAX || keypam[i] < BTN_MISC) {
512                         retval = -EINVAL;
513                         goto out;
514                 }
515         }
516
517         memcpy(joydev->keypam, keypam, len);
518
519         for (i = 0; i < joydev->nkey; i++)
520                 joydev->keymap[keypam[i] - BTN_MISC] = i;
521
522  out:
523         kfree(keypam);
524         return retval;
525 }
526
527
528 static int joydev_ioctl_common(struct joydev *joydev,
529                                 unsigned int cmd, void __user *argp)
530 {
531         struct input_dev *dev = joydev->handle.dev;
532         size_t len;
533         int i, j;
534         const char *name;
535
536         /* Process fixed-sized commands. */
537         switch (cmd) {
538
539         case JS_SET_CAL:
540                 return copy_from_user(&joydev->glue.JS_CORR, argp,
541                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
542
543         case JS_GET_CAL:
544                 return copy_to_user(argp, &joydev->glue.JS_CORR,
545                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
546
547         case JS_SET_TIMEOUT:
548                 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
549
550         case JS_GET_TIMEOUT:
551                 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
552
553         case JSIOCGVERSION:
554                 return put_user(JS_VERSION, (__u32 __user *) argp);
555
556         case JSIOCGAXES:
557                 return put_user(joydev->nabs, (__u8 __user *) argp);
558
559         case JSIOCGBUTTONS:
560                 return put_user(joydev->nkey, (__u8 __user *) argp);
561
562         case JSIOCSCORR:
563                 if (copy_from_user(joydev->corr, argp,
564                               sizeof(joydev->corr[0]) * joydev->nabs))
565                     return -EFAULT;
566
567                 for (i = 0; i < joydev->nabs; i++) {
568                         j = joydev->abspam[i];
569                         joydev->abs[i] = joydev_correct(dev->abs[j],
570                                                         &joydev->corr[i]);
571                 }
572                 return 0;
573
574         case JSIOCGCORR:
575                 return copy_to_user(argp, joydev->corr,
576                         sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
577
578         }
579
580         /*
581          * Process variable-sized commands (the axis and button map commands
582          * are considered variable-sized to decouple them from the values of
583          * ABS_MAX and KEY_MAX).
584          */
585         switch (cmd & ~IOCSIZE_MASK) {
586
587         case (JSIOCSAXMAP & ~IOCSIZE_MASK):
588                 return joydev_handle_JSIOCSAXMAP(joydev, argp, _IOC_SIZE(cmd));
589
590         case (JSIOCGAXMAP & ~IOCSIZE_MASK):
591                 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->abspam));
592                 return copy_to_user(argp, joydev->abspam, len) ? -EFAULT : len;
593
594         case (JSIOCSBTNMAP & ~IOCSIZE_MASK):
595                 return joydev_handle_JSIOCSBTNMAP(joydev, argp, _IOC_SIZE(cmd));
596
597         case (JSIOCGBTNMAP & ~IOCSIZE_MASK):
598                 len = min_t(size_t, _IOC_SIZE(cmd), sizeof(joydev->keypam));
599                 return copy_to_user(argp, joydev->keypam, len) ? -EFAULT : len;
600
601         case JSIOCGNAME(0):
602                 name = dev->name;
603                 if (!name)
604                         return 0;
605
606                 len = min_t(size_t, _IOC_SIZE(cmd), strlen(name) + 1);
607                 return copy_to_user(argp, name, len) ? -EFAULT : len;
608         }
609
610         return -EINVAL;
611 }
612
613 #ifdef CONFIG_COMPAT
614 static long joydev_compat_ioctl(struct file *file,
615                                 unsigned int cmd, unsigned long arg)
616 {
617         struct joydev_client *client = file->private_data;
618         struct joydev *joydev = client->joydev;
619         void __user *argp = (void __user *)arg;
620         s32 tmp32;
621         struct JS_DATA_SAVE_TYPE_32 ds32;
622         int retval;
623
624         retval = mutex_lock_interruptible(&joydev->mutex);
625         if (retval)
626                 return retval;
627
628         if (!joydev->exist) {
629                 retval = -ENODEV;
630                 goto out;
631         }
632
633         switch (cmd) {
634
635         case JS_SET_TIMELIMIT:
636                 retval = get_user(tmp32, (s32 __user *) arg);
637                 if (retval == 0)
638                         joydev->glue.JS_TIMELIMIT = tmp32;
639                 break;
640
641         case JS_GET_TIMELIMIT:
642                 tmp32 = joydev->glue.JS_TIMELIMIT;
643                 retval = put_user(tmp32, (s32 __user *) arg);
644                 break;
645
646         case JS_SET_ALL:
647                 retval = copy_from_user(&ds32, argp,
648                                         sizeof(ds32)) ? -EFAULT : 0;
649                 if (retval == 0) {
650                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
651                         joydev->glue.BUSY          = ds32.BUSY;
652                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
653                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
654                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
655                         joydev->glue.JS_CORR       = ds32.JS_CORR;
656                 }
657                 break;
658
659         case JS_GET_ALL:
660                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
661                 ds32.BUSY          = joydev->glue.BUSY;
662                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
663                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
664                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
665                 ds32.JS_CORR       = joydev->glue.JS_CORR;
666
667                 retval = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
668                 break;
669
670         default:
671                 retval = joydev_ioctl_common(joydev, cmd, argp);
672                 break;
673         }
674
675  out:
676         mutex_unlock(&joydev->mutex);
677         return retval;
678 }
679 #endif /* CONFIG_COMPAT */
680
681 static long joydev_ioctl(struct file *file,
682                          unsigned int cmd, unsigned long arg)
683 {
684         struct joydev_client *client = file->private_data;
685         struct joydev *joydev = client->joydev;
686         void __user *argp = (void __user *)arg;
687         int retval;
688
689         retval = mutex_lock_interruptible(&joydev->mutex);
690         if (retval)
691                 return retval;
692
693         if (!joydev->exist) {
694                 retval = -ENODEV;
695                 goto out;
696         }
697
698         switch (cmd) {
699
700         case JS_SET_TIMELIMIT:
701                 retval = get_user(joydev->glue.JS_TIMELIMIT,
702                                   (long __user *) arg);
703                 break;
704
705         case JS_GET_TIMELIMIT:
706                 retval = put_user(joydev->glue.JS_TIMELIMIT,
707                                   (long __user *) arg);
708                 break;
709
710         case JS_SET_ALL:
711                 retval = copy_from_user(&joydev->glue, argp,
712                                         sizeof(joydev->glue)) ? -EFAULT: 0;
713                 break;
714
715         case JS_GET_ALL:
716                 retval = copy_to_user(argp, &joydev->glue,
717                                       sizeof(joydev->glue)) ? -EFAULT : 0;
718                 break;
719
720         default:
721                 retval = joydev_ioctl_common(joydev, cmd, argp);
722                 break;
723         }
724  out:
725         mutex_unlock(&joydev->mutex);
726         return retval;
727 }
728
729 static const struct file_operations joydev_fops = {
730         .owner          = THIS_MODULE,
731         .read           = joydev_read,
732         .poll           = joydev_poll,
733         .open           = joydev_open,
734         .release        = joydev_release,
735         .unlocked_ioctl = joydev_ioctl,
736 #ifdef CONFIG_COMPAT
737         .compat_ioctl   = joydev_compat_ioctl,
738 #endif
739         .fasync         = joydev_fasync,
740 };
741
742 static int joydev_install_chrdev(struct joydev *joydev)
743 {
744         joydev_table[joydev->minor] = joydev;
745         return 0;
746 }
747
748 static void joydev_remove_chrdev(struct joydev *joydev)
749 {
750         mutex_lock(&joydev_table_mutex);
751         joydev_table[joydev->minor] = NULL;
752         mutex_unlock(&joydev_table_mutex);
753 }
754
755 /*
756  * Mark device non-existant. This disables writes, ioctls and
757  * prevents new users from opening the device. Already posted
758  * blocking reads will stay, however new ones will fail.
759  */
760 static void joydev_mark_dead(struct joydev *joydev)
761 {
762         mutex_lock(&joydev->mutex);
763         joydev->exist = 0;
764         mutex_unlock(&joydev->mutex);
765 }
766
767 static void joydev_cleanup(struct joydev *joydev)
768 {
769         struct input_handle *handle = &joydev->handle;
770
771         joydev_mark_dead(joydev);
772         joydev_hangup(joydev);
773         joydev_remove_chrdev(joydev);
774
775         /* joydev is marked dead so noone else accesses joydev->open */
776         if (joydev->open)
777                 input_close_device(handle);
778 }
779
780
781 static bool joydev_match(struct input_handler *handler, struct input_dev *dev)
782 {
783         /* Avoid touchpads and touchscreens */
784         if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_TOUCH, dev->keybit))
785                 return false;
786
787         /* Avoid tablets, digitisers and similar devices */
788         if (test_bit(EV_KEY, dev->evbit) && test_bit(BTN_DIGI, dev->keybit))
789                 return false;
790
791         return true;
792 }
793
794 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
795                           const struct input_device_id *id)
796 {
797         struct joydev *joydev;
798         int i, j, t, minor;
799         int error;
800
801         for (minor = 0; minor < JOYDEV_MINORS; minor++)
802                 if (!joydev_table[minor])
803                         break;
804
805         if (minor == JOYDEV_MINORS) {
806                 printk(KERN_ERR "joydev: no more free joydev devices\n");
807                 return -ENFILE;
808         }
809
810         joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
811         if (!joydev)
812                 return -ENOMEM;
813
814         INIT_LIST_HEAD(&joydev->client_list);
815         spin_lock_init(&joydev->client_lock);
816         mutex_init(&joydev->mutex);
817         init_waitqueue_head(&joydev->wait);
818
819         dev_set_name(&joydev->dev, "js%d", minor);
820         joydev->exist = 1;
821         joydev->minor = minor;
822
823         joydev->exist = 1;
824         joydev->handle.dev = input_get_device(dev);
825         joydev->handle.name = dev_name(&joydev->dev);
826         joydev->handle.handler = handler;
827         joydev->handle.private = joydev;
828
829         for (i = 0; i < ABS_MAX + 1; i++)
830                 if (test_bit(i, dev->absbit)) {
831                         joydev->absmap[i] = joydev->nabs;
832                         joydev->abspam[joydev->nabs] = i;
833                         joydev->nabs++;
834                 }
835
836         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
837                 if (test_bit(i + BTN_MISC, dev->keybit)) {
838                         joydev->keymap[i] = joydev->nkey;
839                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
840                         joydev->nkey++;
841                 }
842
843         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
844                 if (test_bit(i + BTN_MISC, dev->keybit)) {
845                         joydev->keymap[i] = joydev->nkey;
846                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
847                         joydev->nkey++;
848                 }
849
850         for (i = 0; i < joydev->nabs; i++) {
851                 j = joydev->abspam[i];
852                 if (dev->absmax[j] == dev->absmin[j]) {
853                         joydev->corr[i].type = JS_CORR_NONE;
854                         joydev->abs[i] = dev->abs[j];
855                         continue;
856                 }
857                 joydev->corr[i].type = JS_CORR_BROKEN;
858                 joydev->corr[i].prec = dev->absfuzz[j];
859                 joydev->corr[i].coef[0] =
860                         (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
861                 joydev->corr[i].coef[1] =
862                         (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
863
864                 t = (dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j];
865                 if (t) {
866                         joydev->corr[i].coef[2] = (1 << 29) / t;
867                         joydev->corr[i].coef[3] = (1 << 29) / t;
868
869                         joydev->abs[i] = joydev_correct(dev->abs[j],
870                                                         joydev->corr + i);
871                 }
872         }
873
874         joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
875         joydev->dev.class = &input_class;
876         joydev->dev.parent = &dev->dev;
877         joydev->dev.release = joydev_free;
878         device_initialize(&joydev->dev);
879
880         error = input_register_handle(&joydev->handle);
881         if (error)
882                 goto err_free_joydev;
883
884         error = joydev_install_chrdev(joydev);
885         if (error)
886                 goto err_unregister_handle;
887
888         error = device_add(&joydev->dev);
889         if (error)
890                 goto err_cleanup_joydev;
891
892         return 0;
893
894  err_cleanup_joydev:
895         joydev_cleanup(joydev);
896  err_unregister_handle:
897         input_unregister_handle(&joydev->handle);
898  err_free_joydev:
899         put_device(&joydev->dev);
900         return error;
901 }
902
903 static void joydev_disconnect(struct input_handle *handle)
904 {
905         struct joydev *joydev = handle->private;
906
907         device_del(&joydev->dev);
908         joydev_cleanup(joydev);
909         input_unregister_handle(handle);
910         put_device(&joydev->dev);
911 }
912
913 static const struct input_device_id joydev_ids[] = {
914         {
915                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
916                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
917                 .evbit = { BIT_MASK(EV_ABS) },
918                 .absbit = { BIT_MASK(ABS_X) },
919         },
920         {
921                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
922                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
923                 .evbit = { BIT_MASK(EV_ABS) },
924                 .absbit = { BIT_MASK(ABS_WHEEL) },
925         },
926         {
927                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT |
928                                 INPUT_DEVICE_ID_MATCH_ABSBIT,
929                 .evbit = { BIT_MASK(EV_ABS) },
930                 .absbit = { BIT_MASK(ABS_THROTTLE) },
931         },
932         { }     /* Terminating entry */
933 };
934
935 MODULE_DEVICE_TABLE(input, joydev_ids);
936
937 static struct input_handler joydev_handler = {
938         .event          = joydev_event,
939         .match          = joydev_match,
940         .connect        = joydev_connect,
941         .disconnect     = joydev_disconnect,
942         .fops           = &joydev_fops,
943         .minor          = JOYDEV_MINOR_BASE,
944         .name           = "joydev",
945         .id_table       = joydev_ids,
946 };
947
948 static int __init joydev_init(void)
949 {
950         return input_register_handler(&joydev_handler);
951 }
952
953 static void __exit joydev_exit(void)
954 {
955         input_unregister_handler(&joydev_handler);
956 }
957
958 module_init(joydev_init);
959 module_exit(joydev_exit);