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