Input: convert from class devices to standard devices
[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/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/device.h>
28
29 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
30 MODULE_DESCRIPTION("Joystick device interfaces");
31 MODULE_SUPPORTED_DEVICE("input/js");
32 MODULE_LICENSE("GPL");
33
34 #define JOYDEV_MINOR_BASE       0
35 #define JOYDEV_MINORS           16
36 #define JOYDEV_BUFFER_SIZE      64
37
38 struct joydev {
39         int exist;
40         int open;
41         int minor;
42         char name[16];
43         struct input_handle handle;
44         wait_queue_head_t wait;
45         struct list_head client_list;
46         struct device dev;
47
48         struct js_corr corr[ABS_MAX + 1];
49         struct JS_DATA_SAVE_TYPE glue;
50         int nabs;
51         int nkey;
52         __u16 keymap[KEY_MAX - BTN_MISC + 1];
53         __u16 keypam[KEY_MAX - BTN_MISC + 1];
54         __u8 absmap[ABS_MAX + 1];
55         __u8 abspam[ABS_MAX + 1];
56         __s16 abs[ABS_MAX + 1];
57 };
58
59 struct joydev_client {
60         struct js_event buffer[JOYDEV_BUFFER_SIZE];
61         int head;
62         int tail;
63         int startup;
64         struct fasync_struct *fasync;
65         struct joydev *joydev;
66         struct list_head node;
67 };
68
69 static struct joydev *joydev_table[JOYDEV_MINORS];
70
71 static int joydev_correct(int value, struct js_corr *corr)
72 {
73         switch (corr->type) {
74                 case JS_CORR_NONE:
75                         break;
76                 case JS_CORR_BROKEN:
77                         value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
78                                 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
79                                 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
80                         break;
81                 default:
82                         return 0;
83         }
84
85         return value < -32767 ? -32767 : (value > 32767 ? 32767 : value);
86 }
87
88 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
89 {
90         struct joydev *joydev = handle->private;
91         struct joydev_client *client;
92         struct js_event event;
93
94         switch (type) {
95
96                 case EV_KEY:
97                         if (code < BTN_MISC || value == 2)
98                                 return;
99                         event.type = JS_EVENT_BUTTON;
100                         event.number = joydev->keymap[code - BTN_MISC];
101                         event.value = value;
102                         break;
103
104                 case EV_ABS:
105                         event.type = JS_EVENT_AXIS;
106                         event.number = joydev->absmap[code];
107                         event.value = joydev_correct(value, joydev->corr + event.number);
108                         if (event.value == joydev->abs[event.number])
109                                 return;
110                         joydev->abs[event.number] = event.value;
111                         break;
112
113                 default:
114                         return;
115         }
116
117         event.time = jiffies_to_msecs(jiffies);
118
119         list_for_each_entry(client, &joydev->client_list, node) {
120
121                 memcpy(client->buffer + client->head, &event, sizeof(struct js_event));
122
123                 if (client->startup == joydev->nabs + joydev->nkey)
124                         if (client->tail == (client->head = (client->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
125                                 client->startup = 0;
126
127                 kill_fasync(&client->fasync, SIGIO, POLL_IN);
128         }
129
130         wake_up_interruptible(&joydev->wait);
131 }
132
133 static int joydev_fasync(int fd, struct file *file, int on)
134 {
135         int retval;
136         struct joydev_client *client = file->private_data;
137
138         retval = fasync_helper(fd, file, on, &client->fasync);
139
140         return retval < 0 ? retval : 0;
141 }
142
143 static void joydev_free(struct device *dev)
144 {
145         struct joydev *joydev = container_of(dev, struct joydev, dev);
146
147         joydev_table[joydev->minor] = NULL;
148         kfree(joydev);
149 }
150
151 static int joydev_release(struct inode *inode, struct file *file)
152 {
153         struct joydev_client *client = file->private_data;
154         struct joydev *joydev = client->joydev;
155
156         joydev_fasync(-1, file, 0);
157
158         list_del(&client->node);
159         kfree(client);
160
161         if (!--joydev->open && joydev->exist)
162                 input_close_device(&joydev->handle);
163
164         put_device(&joydev->dev);
165
166         return 0;
167 }
168
169 static int joydev_open(struct inode *inode, struct file *file)
170 {
171         struct joydev_client *client;
172         struct joydev *joydev;
173         int i = iminor(inode) - JOYDEV_MINOR_BASE;
174         int error;
175
176         if (i >= JOYDEV_MINORS)
177                 return -ENODEV;
178
179         joydev = joydev_table[i];
180         if (!joydev || !joydev->exist)
181                 return -ENODEV;
182
183         get_device(&joydev->dev);
184
185         client = kzalloc(sizeof(struct joydev_client), GFP_KERNEL);
186         if (!client) {
187                 error = -ENOMEM;
188                 goto err_put_joydev;
189         }
190
191         client->joydev = joydev;
192         list_add_tail(&client->node, &joydev->client_list);
193
194         if (!joydev->open++ && joydev->exist) {
195                 error = input_open_device(&joydev->handle);
196                 if (error)
197                         goto err_free_client;
198         }
199
200         file->private_data = client;
201         return 0;
202
203  err_free_client:
204         list_del(&client->node);
205         kfree(client);
206  err_put_joydev:
207         put_device(&joydev->dev);
208         return error;
209 }
210
211 static ssize_t joydev_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
212 {
213         return -EINVAL;
214 }
215
216 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
217 {
218         struct joydev_client *client = file->private_data;
219         struct joydev *joydev = client->joydev;
220         struct input_dev *input = joydev->handle.dev;
221         int retval = 0;
222
223         if (!joydev->exist)
224                 return -ENODEV;
225
226         if (count < sizeof(struct js_event))
227                 return -EINVAL;
228
229         if (count == sizeof(struct JS_DATA_TYPE)) {
230
231                 struct JS_DATA_TYPE data;
232                 int i;
233
234                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
235                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
236                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
237                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
238
239                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
240                         return -EFAULT;
241
242                 client->startup = 0;
243                 client->tail = client->head;
244
245                 return sizeof(struct JS_DATA_TYPE);
246         }
247
248         if (client->startup == joydev->nabs + joydev->nkey &&
249             client->head == client->tail && (file->f_flags & O_NONBLOCK))
250                 return -EAGAIN;
251
252         retval = wait_event_interruptible(joydev->wait,
253                                           !joydev->exist ||
254                                           client->startup < joydev->nabs + joydev->nkey ||
255                                           client->head != client->tail);
256         if (retval)
257                 return retval;
258
259         if (!joydev->exist)
260                 return -ENODEV;
261
262         while (client->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
263
264                 struct js_event event;
265
266                 event.time = jiffies_to_msecs(jiffies);
267
268                 if (client->startup < joydev->nkey) {
269                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
270                         event.number = client->startup;
271                         event.value = !!test_bit(joydev->keypam[event.number], input->key);
272                 } else {
273                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
274                         event.number = client->startup - joydev->nkey;
275                         event.value = joydev->abs[event.number];
276                 }
277
278                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
279                         return -EFAULT;
280
281                 client->startup++;
282                 retval += sizeof(struct js_event);
283         }
284
285         while (client->head != client->tail && retval + sizeof(struct js_event) <= count) {
286
287                 if (copy_to_user(buf + retval, client->buffer + client->tail, sizeof(struct js_event)))
288                         return -EFAULT;
289
290                 client->tail = (client->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
291                 retval += sizeof(struct js_event);
292         }
293
294         return retval;
295 }
296
297 /* No kernel lock - fine */
298 static unsigned int joydev_poll(struct file *file, poll_table *wait)
299 {
300         struct joydev_client *client = file->private_data;
301         struct joydev *joydev = client->joydev;
302
303         poll_wait(file, &joydev->wait, wait);
304         return ((client->head != client->tail || client->startup < joydev->nabs + joydev->nkey) ?
305                 (POLLIN | POLLRDNORM) : 0) | (joydev->exist ? 0 : (POLLHUP | POLLERR));
306 }
307
308 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
309 {
310         struct input_dev *dev = joydev->handle.dev;
311         int i, j;
312
313         switch (cmd) {
314
315                 case JS_SET_CAL:
316                         return copy_from_user(&joydev->glue.JS_CORR, argp,
317                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
318
319                 case JS_GET_CAL:
320                         return copy_to_user(argp, &joydev->glue.JS_CORR,
321                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
322
323                 case JS_SET_TIMEOUT:
324                         return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
325
326                 case JS_GET_TIMEOUT:
327                         return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
328
329                 case JSIOCGVERSION:
330                         return put_user(JS_VERSION, (__u32 __user *) argp);
331
332                 case JSIOCGAXES:
333                         return put_user(joydev->nabs, (__u8 __user *) argp);
334
335                 case JSIOCGBUTTONS:
336                         return put_user(joydev->nkey, (__u8 __user *) argp);
337
338                 case JSIOCSCORR:
339                         if (copy_from_user(joydev->corr, argp,
340                                       sizeof(joydev->corr[0]) * joydev->nabs))
341                             return -EFAULT;
342                         for (i = 0; i < joydev->nabs; i++) {
343                                 j = joydev->abspam[i];
344                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
345                         }
346                         return 0;
347
348                 case JSIOCGCORR:
349                         return copy_to_user(argp, joydev->corr,
350                                                 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
351
352                 case JSIOCSAXMAP:
353                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
354                                 return -EFAULT;
355                         for (i = 0; i < joydev->nabs; i++) {
356                                 if (joydev->abspam[i] > ABS_MAX)
357                                         return -EINVAL;
358                                 joydev->absmap[joydev->abspam[i]] = i;
359                         }
360                         return 0;
361
362                 case JSIOCGAXMAP:
363                         return copy_to_user(argp, joydev->abspam,
364                                                 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
365
366                 case JSIOCSBTNMAP:
367                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
368                                 return -EFAULT;
369                         for (i = 0; i < joydev->nkey; i++) {
370                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC)
371                                         return -EINVAL;
372                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
373                         }
374                         return 0;
375
376                 case JSIOCGBTNMAP:
377                         return copy_to_user(argp, joydev->keypam,
378                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
379
380                 default:
381                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
382                                 int len;
383                                 if (!dev->name)
384                                         return 0;
385                                 len = strlen(dev->name) + 1;
386                                 if (len > _IOC_SIZE(cmd))
387                                         len = _IOC_SIZE(cmd);
388                                 if (copy_to_user(argp, dev->name, len))
389                                         return -EFAULT;
390                                 return len;
391                         }
392         }
393         return -EINVAL;
394 }
395
396 #ifdef CONFIG_COMPAT
397 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
398 {
399         struct joydev_client *client = file->private_data;
400         struct joydev *joydev = client->joydev;
401         void __user *argp = (void __user *)arg;
402         s32 tmp32;
403         struct JS_DATA_SAVE_TYPE_32 ds32;
404         int err;
405
406         if (!joydev->exist)
407                 return -ENODEV;
408
409         switch(cmd) {
410         case JS_SET_TIMELIMIT:
411                 err = get_user(tmp32, (s32 __user *) arg);
412                 if (err == 0)
413                         joydev->glue.JS_TIMELIMIT = tmp32;
414                 break;
415         case JS_GET_TIMELIMIT:
416                 tmp32 = joydev->glue.JS_TIMELIMIT;
417                 err = put_user(tmp32, (s32 __user *) arg);
418                 break;
419
420         case JS_SET_ALL:
421                 err = copy_from_user(&ds32, argp,
422                                      sizeof(ds32)) ? -EFAULT : 0;
423                 if (err == 0) {
424                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
425                         joydev->glue.BUSY          = ds32.BUSY;
426                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
427                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
428                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
429                         joydev->glue.JS_CORR       = ds32.JS_CORR;
430                 }
431                 break;
432
433         case JS_GET_ALL:
434                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
435                 ds32.BUSY          = joydev->glue.BUSY;
436                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
437                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
438                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
439                 ds32.JS_CORR       = joydev->glue.JS_CORR;
440
441                 err = copy_to_user(argp, &ds32, sizeof(ds32)) ? -EFAULT : 0;
442                 break;
443
444         default:
445                 err = joydev_ioctl_common(joydev, cmd, argp);
446         }
447         return err;
448 }
449 #endif /* CONFIG_COMPAT */
450
451 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
452 {
453         struct joydev_client *client = file->private_data;
454         struct joydev *joydev = client->joydev;
455         void __user *argp = (void __user *)arg;
456
457         if (!joydev->exist)
458                 return -ENODEV;
459
460         switch(cmd) {
461                 case JS_SET_TIMELIMIT:
462                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
463                 case JS_GET_TIMELIMIT:
464                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
465                 case JS_SET_ALL:
466                         return copy_from_user(&joydev->glue, argp,
467                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
468                 case JS_GET_ALL:
469                         return copy_to_user(argp, &joydev->glue,
470                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
471                 default:
472                         return joydev_ioctl_common(joydev, cmd, argp);
473         }
474 }
475
476 static const struct file_operations joydev_fops = {
477         .owner =        THIS_MODULE,
478         .read =         joydev_read,
479         .write =        joydev_write,
480         .poll =         joydev_poll,
481         .open =         joydev_open,
482         .release =      joydev_release,
483         .ioctl =        joydev_ioctl,
484 #ifdef CONFIG_COMPAT
485         .compat_ioctl = joydev_compat_ioctl,
486 #endif
487         .fasync =       joydev_fasync,
488 };
489
490 static int joydev_connect(struct input_handler *handler, struct input_dev *dev,
491                           const struct input_device_id *id)
492 {
493         struct joydev *joydev;
494         int i, j, t, minor;
495         int error;
496
497         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
498         if (minor == JOYDEV_MINORS) {
499                 printk(KERN_ERR "joydev: no more free joydev devices\n");
500                 return -ENFILE;
501         }
502
503         joydev = kzalloc(sizeof(struct joydev), GFP_KERNEL);
504         if (!joydev)
505                 return -ENOMEM;
506
507         INIT_LIST_HEAD(&joydev->client_list);
508         init_waitqueue_head(&joydev->wait);
509
510         joydev->minor = minor;
511         joydev->exist = 1;
512         joydev->handle.dev = dev;
513         joydev->handle.name = joydev->name;
514         joydev->handle.handler = handler;
515         joydev->handle.private = joydev;
516         snprintf(joydev->name, sizeof(joydev->name), "js%d", minor);
517
518         for (i = 0; i < ABS_MAX + 1; i++)
519                 if (test_bit(i, dev->absbit)) {
520                         joydev->absmap[i] = joydev->nabs;
521                         joydev->abspam[joydev->nabs] = i;
522                         joydev->nabs++;
523                 }
524
525         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
526                 if (test_bit(i + BTN_MISC, dev->keybit)) {
527                         joydev->keymap[i] = joydev->nkey;
528                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
529                         joydev->nkey++;
530                 }
531
532         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
533                 if (test_bit(i + BTN_MISC, dev->keybit)) {
534                         joydev->keymap[i] = joydev->nkey;
535                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
536                         joydev->nkey++;
537                 }
538
539         for (i = 0; i < joydev->nabs; i++) {
540                 j = joydev->abspam[i];
541                 if (dev->absmax[j] == dev->absmin[j]) {
542                         joydev->corr[i].type = JS_CORR_NONE;
543                         joydev->abs[i] = dev->abs[j];
544                         continue;
545                 }
546                 joydev->corr[i].type = JS_CORR_BROKEN;
547                 joydev->corr[i].prec = dev->absfuzz[j];
548                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
549                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
550                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
551                         continue;
552                 joydev->corr[i].coef[2] = (1 << 29) / t;
553                 joydev->corr[i].coef[3] = (1 << 29) / t;
554
555                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
556         }
557
558         snprintf(joydev->dev.bus_id, sizeof(joydev->dev.bus_id),
559                  "js%d", minor);
560         joydev->dev.class = &input_class;
561         joydev->dev.parent = &dev->dev;
562         joydev->dev.devt = MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor);
563         joydev->dev.release = joydev_free;
564         device_initialize(&joydev->dev);
565
566         joydev_table[minor] = joydev;
567
568         error = device_add(&joydev->dev);
569         if (error)
570                 goto err_free_joydev;
571
572         error = input_register_handle(&joydev->handle);
573         if (error)
574                 goto err_delete_joydev;
575
576         return 0;
577
578  err_delete_joydev:
579         device_del(&joydev->dev);
580  err_free_joydev:
581         put_device(&joydev->dev);
582         return error;
583 }
584
585
586 static void joydev_disconnect(struct input_handle *handle)
587 {
588         struct joydev *joydev = handle->private;
589         struct joydev_client *client;
590
591         input_unregister_handle(handle);
592         device_del(&joydev->dev);
593
594         joydev->exist = 0;
595
596         if (joydev->open) {
597                 input_close_device(handle);
598                 list_for_each_entry(client, &joydev->client_list, node)
599                         kill_fasync(&client->fasync, SIGIO, POLL_HUP);
600                 wake_up_interruptible(&joydev->wait);
601         }
602
603         put_device(&joydev->dev);
604 }
605
606 static const struct input_device_id joydev_blacklist[] = {
607         {
608                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
609                 .evbit = { BIT(EV_KEY) },
610                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
611         },      /* Avoid itouchpads, touchscreens and tablets */
612         { }     /* Terminating entry */
613 };
614
615 static const struct input_device_id joydev_ids[] = {
616         {
617                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
618                 .evbit = { BIT(EV_ABS) },
619                 .absbit = { BIT(ABS_X) },
620         },
621         {
622                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
623                 .evbit = { BIT(EV_ABS) },
624                 .absbit = { BIT(ABS_WHEEL) },
625         },
626         {
627                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
628                 .evbit = { BIT(EV_ABS) },
629                 .absbit = { BIT(ABS_THROTTLE) },
630         },
631         { }     /* Terminating entry */
632 };
633
634 MODULE_DEVICE_TABLE(input, joydev_ids);
635
636 static struct input_handler joydev_handler = {
637         .event =        joydev_event,
638         .connect =      joydev_connect,
639         .disconnect =   joydev_disconnect,
640         .fops =         &joydev_fops,
641         .minor =        JOYDEV_MINOR_BASE,
642         .name =         "joydev",
643         .id_table =     joydev_ids,
644         .blacklist =    joydev_blacklist,
645 };
646
647 static int __init joydev_init(void)
648 {
649         return input_register_handler(&joydev_handler);
650 }
651
652 static void __exit joydev_exit(void)
653 {
654         input_unregister_handler(&joydev_handler);
655 }
656
657 module_init(joydev_init);
658 module_exit(joydev_exit);