Input: rework handle creation code
[linux-3.10.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/slab.h>
22 #include <linux/mm.h>
23 #include <linux/miscdevice.h>
24 #include <linux/module.h>
25 #include <linux/poll.h>
26 #include <linux/init.h>
27 #include <linux/smp_lock.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         char name[16];
44         struct input_handle handle;
45         wait_queue_head_t wait;
46         struct list_head list;
47         struct js_corr corr[ABS_MAX + 1];
48         struct JS_DATA_SAVE_TYPE glue;
49         int nabs;
50         int nkey;
51         __u16 keymap[KEY_MAX - BTN_MISC + 1];
52         __u16 keypam[KEY_MAX - BTN_MISC + 1];
53         __u8 absmap[ABS_MAX + 1];
54         __u8 abspam[ABS_MAX + 1];
55         __s16 abs[ABS_MAX + 1];
56 };
57
58 struct joydev_list {
59         struct js_event buffer[JOYDEV_BUFFER_SIZE];
60         int head;
61         int tail;
62         int startup;
63         struct fasync_struct *fasync;
64         struct joydev *joydev;
65         struct list_head node;
66 };
67
68 static struct joydev *joydev_table[JOYDEV_MINORS];
69
70 static int joydev_correct(int value, struct js_corr *corr)
71 {
72         switch (corr->type) {
73                 case JS_CORR_NONE:
74                         break;
75                 case JS_CORR_BROKEN:
76                         value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
77                                 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
78                                 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
79                         break;
80                 default:
81                         return 0;
82         }
83
84         return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
85 }
86
87 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
88 {
89         struct joydev *joydev = handle->private;
90         struct joydev_list *list;
91         struct js_event event;
92
93         switch (type) {
94
95                 case EV_KEY:
96                         if (code < BTN_MISC || value == 2)
97                                 return;
98                         event.type = JS_EVENT_BUTTON;
99                         event.number = joydev->keymap[code - BTN_MISC];
100                         event.value = value;
101                         break;
102
103                 case EV_ABS:
104                         event.type = JS_EVENT_AXIS;
105                         event.number = joydev->absmap[code];
106                         event.value = joydev_correct(value, joydev->corr + event.number);
107                         if (event.value == joydev->abs[event.number])
108                                 return;
109                         joydev->abs[event.number] = event.value;
110                         break;
111
112                 default:
113                         return;
114         }
115
116         event.time = jiffies_to_msecs(jiffies);
117
118         list_for_each_entry(list, &joydev->list, node) {
119
120                 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
121
122                 if (list->startup == joydev->nabs + joydev->nkey)
123                         if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
124                                 list->startup = 0;
125
126                 kill_fasync(&list->fasync, SIGIO, POLL_IN);
127         }
128
129         wake_up_interruptible(&joydev->wait);
130 }
131
132 static int joydev_fasync(int fd, struct file *file, int on)
133 {
134         int retval;
135         struct joydev_list *list = file->private_data;
136
137         retval = fasync_helper(fd, file, on, &list->fasync);
138
139         return retval < 0 ? retval : 0;
140 }
141
142 static void joydev_free(struct joydev *joydev)
143 {
144         joydev_table[joydev->minor] = NULL;
145         kfree(joydev);
146 }
147
148 static int joydev_release(struct inode * inode, struct file * file)
149 {
150         struct joydev_list *list = file->private_data;
151
152         joydev_fasync(-1, file, 0);
153
154         list_del(&list->node);
155
156         if (!--list->joydev->open) {
157                 if (list->joydev->exist)
158                         input_close_device(&list->joydev->handle);
159                 else
160                         joydev_free(list->joydev);
161         }
162
163         kfree(list);
164         return 0;
165 }
166
167 static int joydev_open(struct inode *inode, struct file *file)
168 {
169         struct joydev_list *list;
170         int i = iminor(inode) - JOYDEV_MINOR_BASE;
171
172         if (i >= JOYDEV_MINORS || !joydev_table[i])
173                 return -ENODEV;
174
175         if (!(list = kzalloc(sizeof(struct joydev_list), GFP_KERNEL)))
176                 return -ENOMEM;
177
178         list->joydev = joydev_table[i];
179         list_add_tail(&list->node, &joydev_table[i]->list);
180         file->private_data = list;
181
182         if (!list->joydev->open++)
183                 if (list->joydev->exist)
184                         input_open_device(&list->joydev->handle);
185
186         return 0;
187 }
188
189 static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
190 {
191         return -EINVAL;
192 }
193
194 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
195 {
196         struct joydev_list *list = file->private_data;
197         struct joydev *joydev = list->joydev;
198         struct input_dev *input = joydev->handle.dev;
199         int retval = 0;
200
201         if (!list->joydev->exist)
202                 return -ENODEV;
203
204         if (count < sizeof(struct js_event))
205                 return -EINVAL;
206
207         if (count == sizeof(struct JS_DATA_TYPE)) {
208
209                 struct JS_DATA_TYPE data;
210                 int i;
211
212                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
213                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
214                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
215                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
216
217                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
218                         return -EFAULT;
219
220                 list->startup = 0;
221                 list->tail = list->head;
222
223                 return sizeof(struct JS_DATA_TYPE);
224         }
225
226         if (list->startup == joydev->nabs + joydev->nkey &&
227             list->head == list->tail && (file->f_flags & O_NONBLOCK))
228                 return -EAGAIN;
229
230         retval = wait_event_interruptible(list->joydev->wait,
231                                           !list->joydev->exist ||
232                                           list->startup < joydev->nabs + joydev->nkey ||
233                                           list->head != list->tail);
234
235         if (retval)
236                 return retval;
237
238         if (!list->joydev->exist)
239                 return -ENODEV;
240
241         while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
242
243                 struct js_event event;
244
245                 event.time = jiffies_to_msecs(jiffies);
246
247                 if (list->startup < joydev->nkey) {
248                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
249                         event.number = list->startup;
250                         event.value = !!test_bit(joydev->keypam[event.number], input->key);
251                 } else {
252                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
253                         event.number = list->startup - joydev->nkey;
254                         event.value = joydev->abs[event.number];
255                 }
256
257                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
258                         return -EFAULT;
259
260                 list->startup++;
261                 retval += sizeof(struct js_event);
262         }
263
264         while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
265
266                 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
267                         return -EFAULT;
268
269                 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
270                 retval += sizeof(struct js_event);
271         }
272
273         return retval;
274 }
275
276 /* No kernel lock - fine */
277 static unsigned int joydev_poll(struct file *file, poll_table *wait)
278 {
279         struct joydev_list *list = file->private_data;
280
281         poll_wait(file, &list->joydev->wait, wait);
282         return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ?
283                 (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR));
284 }
285
286 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
287 {
288         struct input_dev *dev = joydev->handle.dev;
289         int i, j;
290
291         switch (cmd) {
292
293                 case JS_SET_CAL:
294                         return copy_from_user(&joydev->glue.JS_CORR, argp,
295                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
296
297                 case JS_GET_CAL:
298                         return copy_to_user(argp, &joydev->glue.JS_CORR,
299                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
300
301                 case JS_SET_TIMEOUT:
302                         return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
303
304                 case JS_GET_TIMEOUT:
305                         return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
306
307                 case JSIOCGVERSION:
308                         return put_user(JS_VERSION, (__u32 __user *) argp);
309
310                 case JSIOCGAXES:
311                         return put_user(joydev->nabs, (__u8 __user *) argp);
312
313                 case JSIOCGBUTTONS:
314                         return put_user(joydev->nkey, (__u8 __user *) argp);
315
316                 case JSIOCSCORR:
317                         if (copy_from_user(joydev->corr, argp,
318                                       sizeof(joydev->corr[0]) * joydev->nabs))
319                             return -EFAULT;
320                         for (i = 0; i < joydev->nabs; i++) {
321                                 j = joydev->abspam[i];
322                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
323                         }
324                         return 0;
325
326                 case JSIOCGCORR:
327                         return copy_to_user(argp, joydev->corr,
328                                                 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
329
330                 case JSIOCSAXMAP:
331                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
332                                 return -EFAULT;
333                         for (i = 0; i < joydev->nabs; i++) {
334                                 if (joydev->abspam[i] > ABS_MAX)
335                                         return -EINVAL;
336                                 joydev->absmap[joydev->abspam[i]] = i;
337                         }
338                         return 0;
339
340                 case JSIOCGAXMAP:
341                         return copy_to_user(argp, joydev->abspam,
342                                                 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
343
344                 case JSIOCSBTNMAP:
345                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
346                                 return -EFAULT;
347                         for (i = 0; i < joydev->nkey; i++) {
348                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC)
349                                         return -EINVAL;
350                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
351                         }
352                         return 0;
353
354                 case JSIOCGBTNMAP:
355                         return copy_to_user(argp, joydev->keypam,
356                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
357
358                 default:
359                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
360                                 int len;
361                                 if (!dev->name)
362                                         return 0;
363                                 len = strlen(dev->name) + 1;
364                                 if (len > _IOC_SIZE(cmd))
365                                         len = _IOC_SIZE(cmd);
366                                 if (copy_to_user(argp, dev->name, len))
367                                         return -EFAULT;
368                                 return len;
369                         }
370         }
371         return -EINVAL;
372 }
373
374 #ifdef CONFIG_COMPAT
375 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
376 {
377         struct joydev_list *list = file->private_data;
378         struct joydev *joydev = list->joydev;
379         void __user *argp = (void __user *)arg;
380         s32 tmp32;
381         struct JS_DATA_SAVE_TYPE_32 ds32;
382         int err;
383
384         if (!joydev->exist)
385                 return -ENODEV;
386
387         switch(cmd) {
388         case JS_SET_TIMELIMIT:
389                 err = get_user(tmp32, (s32 __user *) arg);
390                 if (err == 0)
391                         joydev->glue.JS_TIMELIMIT = tmp32;
392                 break;
393         case JS_GET_TIMELIMIT:
394                 tmp32 = joydev->glue.JS_TIMELIMIT;
395                 err = put_user(tmp32, (s32 __user *) arg);
396                 break;
397
398         case JS_SET_ALL:
399                 err = copy_from_user(&ds32, argp,
400                                      sizeof(ds32)) ? -EFAULT : 0;
401                 if (err == 0) {
402                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
403                         joydev->glue.BUSY          = ds32.BUSY;
404                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
405                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
406                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
407                         joydev->glue.JS_CORR       = ds32.JS_CORR;
408                 }
409                 break;
410
411         case JS_GET_ALL:
412                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
413                 ds32.BUSY          = joydev->glue.BUSY;
414                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
415                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
416                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
417                 ds32.JS_CORR       = joydev->glue.JS_CORR;
418
419                 err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
420                 break;
421
422         default:
423                 err = joydev_ioctl_common(joydev, cmd, argp);
424         }
425         return err;
426 }
427 #endif /* CONFIG_COMPAT */
428
429 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
430 {
431         struct joydev_list *list = file->private_data;
432         struct joydev *joydev = list->joydev;
433         void __user *argp = (void __user *)arg;
434
435         if (!joydev->exist)
436                 return -ENODEV;
437
438         switch(cmd) {
439                 case JS_SET_TIMELIMIT:
440                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
441                 case JS_GET_TIMELIMIT:
442                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
443                 case JS_SET_ALL:
444                         return copy_from_user(&joydev->glue, argp,
445                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
446                 case JS_GET_ALL:
447                         return copy_to_user(argp, &joydev->glue,
448                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
449                 default:
450                         return joydev_ioctl_common(joydev, cmd, argp);
451         }
452 }
453
454 static const struct file_operations joydev_fops = {
455         .owner =        THIS_MODULE,
456         .read =         joydev_read,
457         .write =        joydev_write,
458         .poll =         joydev_poll,
459         .open =         joydev_open,
460         .release =      joydev_release,
461         .ioctl =        joydev_ioctl,
462 #ifdef CONFIG_COMPAT
463         .compat_ioctl = joydev_compat_ioctl,
464 #endif
465         .fasync =       joydev_fasync,
466 };
467
468 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
469                           const struct input_device_id *id)
470 {
471         struct joydev *joydev;
472         struct class_device *cdev;
473         dev_t devt;
474         int i, j, t, minor;
475         int error;
476
477         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
478         if (minor == JOYDEV_MINORS) {
479                 printk(KERN_ERR "joydev: no more free joydev devices\n");
480                 return -ENFILE;
481         }
482
483         joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
484         if (!joydev)
485                 return -ENOMEM;
486
487         INIT_LIST_HEAD(&joydev->list);
488         init_waitqueue_head(&joydev->wait);
489
490         joydev->minor = minor;
491         joydev->exist = 1;
492         joydev->handle.dev = dev;
493         joydev->handle.name = joydev->name;
494         joydev->handle.handler = handler;
495         joydev->handle.private = joydev;
496         sprintf(joydev->name, "js%d", minor);
497
498         for (i = 0; i < ABS_MAX + 1; i++)
499                 if (test_bit(i, dev->absbit)) {
500                         joydev->absmap[i] = joydev->nabs;
501                         joydev->abspam[joydev->nabs] = i;
502                         joydev->nabs++;
503                 }
504
505         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
506                 if (test_bit(i + BTN_MISC, dev->keybit)) {
507                         joydev->keymap[i] = joydev->nkey;
508                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
509                         joydev->nkey++;
510                 }
511
512         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
513                 if (test_bit(i + BTN_MISC, dev->keybit)) {
514                         joydev->keymap[i] = joydev->nkey;
515                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
516                         joydev->nkey++;
517                 }
518
519         for (i = 0; i < joydev->nabs; i++) {
520                 j = joydev->abspam[i];
521                 if (dev->absmax[j] == dev->absmin[j]) {
522                         joydev->corr[i].type = JS_CORR_NONE;
523                         joydev->abs[i] = dev->abs[j];
524                         continue;
525                 }
526                 joydev->corr[i].type = JS_CORR_BROKEN;
527                 joydev->corr[i].prec = dev->absfuzz[j];
528                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
529                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
530                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
531                         continue;
532                 joydev->corr[i].coef[2] = (1 << 29) / t;
533                 joydev->corr[i].coef[3] = (1 << 29) / t;
534
535                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
536         }
537
538         joydev_table[minor] = joydev;
539
540         devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
541
542         cdev = class_device_create(&input_class, &dev->cdev, devt,
543                                    dev->cdev.dev, joydev->name);
544         if (IS_ERR(cdev)) {
545                 error = PTR_ERR(cdev);
546                 goto err_free_joydev;
547         }
548
549         /* temporary symlink to keep userspace happy */
550         error = sysfs_create_link(&input_class.subsys.kset.kobj,
551                                   &cdev->kobj, joydev->name);
552         if (error)
553                 goto err_cdev_destroy;
554
555         error = input_register_handle(&joydev->handle);
556         if (error)
557                 goto err_remove_link;
558
559         return 0;
560
561  err_remove_link:
562         sysfs_remove_link(&input_class.subsys.kset.kobj, joydev->name);
563  err_cdev_destroy:
564         class_device_destroy(&input_class, devt);
565  err_free_joydev:
566         joydev_table[minor] = NULL;
567         kfree(joydev);
568         return error;
569 }
570
571
572 static void joydev_disconnect(struct input_handle *handle)
573 {
574         struct joydev *joydev = handle->private;
575         struct joydev_list *list;
576
577         input_unregister_handle(handle);
578
579         sysfs_remove_link(&input_class.subsys.kset.kobj, joydev->name);
580         class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
581         joydev->exist = 0;
582
583         if (joydev->open) {
584                 input_close_device(handle);
585                 wake_up_interruptible(&joydev->wait);
586                 list_for_each_entry(list, &joydev->list, node)
587                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
588         } else
589                 joydev_free(joydev);
590 }
591
592 static const struct input_device_id joydev_blacklist[] = {
593         {
594                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
595                 .evbit = { BIT(EV_KEY) },
596                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
597         },      /* Avoid itouchpads, touchscreens and tablets */
598         { }     /* Terminating entry */
599 };
600
601 static const struct input_device_id joydev_ids[] = {
602         {
603                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
604                 .evbit = { BIT(EV_ABS) },
605                 .absbit = { BIT(ABS_X) },
606         },
607         {
608                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
609                 .evbit = { BIT(EV_ABS) },
610                 .absbit = { BIT(ABS_WHEEL) },
611         },
612         {
613                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
614                 .evbit = { BIT(EV_ABS) },
615                 .absbit = { BIT(ABS_THROTTLE) },
616         },
617         { }     /* Terminating entry */
618 };
619
620 MODULE_DEVICE_TABLE(input, joydev_ids);
621
622 static struct input_handler joydev_handler = {
623         .event =        joydev_event,
624         .connect =      joydev_connect,
625         .disconnect =   joydev_disconnect,
626         .fops =         &joydev_fops,
627         .minor =        JOYDEV_MINOR_BASE,
628         .name =         "joydev",
629         .id_table =     joydev_ids,
630         .blacklist =    joydev_blacklist,
631 };
632
633 static int __init joydev_init(void)
634 {
635         return input_register_handler(&joydev_handler);
636 }
637
638 static void __exit joydev_exit(void)
639 {
640         input_unregister_handler(&joydev_handler);
641 }
642
643 module_init(joydev_init);
644 module_exit(joydev_exit);