[PATCH] drivers/input/mouse: convert to dynamic input_dev allocation
[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/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         if (value < -32767) return -32767;
85         if (value >  32767) return  32767;
86
87         return value;
88 }
89
90 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
91 {
92         struct joydev *joydev = handle->private;
93         struct joydev_list *list;
94         struct js_event event;
95
96         switch (type) {
97
98                 case EV_KEY:
99                         if (code < BTN_MISC || value == 2) return;
100                         event.type = JS_EVENT_BUTTON;
101                         event.number = joydev->keymap[code - BTN_MISC];
102                         event.value = value;
103                         break;
104
105                 case EV_ABS:
106                         event.type = JS_EVENT_AXIS;
107                         event.number = joydev->absmap[code];
108                         event.value = joydev_correct(value, joydev->corr + event.number);
109                         if (event.value == joydev->abs[event.number]) 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(list, &joydev->list, node) {
120
121                 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
122
123                 if (list->startup == joydev->nabs + joydev->nkey)
124                         if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
125                                 list->startup = 0;
126
127                 kill_fasync(&list->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_list *list = file->private_data;
137         retval = fasync_helper(fd, file, on, &list->fasync);
138         return retval < 0 ? retval : 0;
139 }
140
141 static void joydev_free(struct joydev *joydev)
142 {
143         joydev_table[joydev->minor] = NULL;
144         kfree(joydev);
145 }
146
147 static int joydev_release(struct inode * inode, struct file * file)
148 {
149         struct joydev_list *list = file->private_data;
150
151         joydev_fasync(-1, file, 0);
152
153         list_del(&list->node);
154
155         if (!--list->joydev->open) {
156                 if (list->joydev->exist)
157                         input_close_device(&list->joydev->handle);
158                 else
159                         joydev_free(list->joydev);
160         }
161
162         kfree(list);
163         return 0;
164 }
165
166 static int joydev_open(struct inode *inode, struct file *file)
167 {
168         struct joydev_list *list;
169         int i = iminor(inode) - JOYDEV_MINOR_BASE;
170
171         if (i >= JOYDEV_MINORS || !joydev_table[i])
172                 return -ENODEV;
173
174         if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
175                 return -ENOMEM;
176         memset(list, 0, sizeof(struct joydev_list));
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         poll_wait(file, &list->joydev->wait, wait);
281         return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ? 
282                 (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR));
283 }
284
285 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
286 {
287         struct input_dev *dev = joydev->handle.dev;
288         int i, j;
289
290         switch (cmd) {
291
292                 case JS_SET_CAL:
293                         return copy_from_user(&joydev->glue.JS_CORR, argp,
294                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
295                 case JS_GET_CAL:
296                         return copy_to_user(argp, &joydev->glue.JS_CORR,
297                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
298                 case JS_SET_TIMEOUT:
299                         return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
300                 case JS_GET_TIMEOUT:
301                         return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
302
303                 case JSIOCGVERSION:
304                         return put_user(JS_VERSION, (__u32 __user *) argp);
305                 case JSIOCGAXES:
306                         return put_user(joydev->nabs, (__u8 __user *) argp);
307                 case JSIOCGBUTTONS:
308                         return put_user(joydev->nkey, (__u8 __user *) argp);
309                 case JSIOCSCORR:
310                         if (copy_from_user(joydev->corr, argp,
311                                       sizeof(joydev->corr[0]) * joydev->nabs))
312                             return -EFAULT;
313                         for (i = 0; i < joydev->nabs; i++) {
314                                 j = joydev->abspam[i];
315                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
316                         }
317                         return 0;
318                 case JSIOCGCORR:
319                         return copy_to_user(argp, joydev->corr,
320                                                 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
321                 case JSIOCSAXMAP:
322                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
323                                 return -EFAULT;
324                         for (i = 0; i < joydev->nabs; i++) {
325                                 if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
326                                 joydev->absmap[joydev->abspam[i]] = i;
327                         }
328                         return 0;
329                 case JSIOCGAXMAP:
330                         return copy_to_user(argp, joydev->abspam,
331                                                 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
332                 case JSIOCSBTNMAP:
333                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
334                                 return -EFAULT;
335                         for (i = 0; i < joydev->nkey; i++) {
336                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
337                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
338                         }
339                         return 0;
340                 case JSIOCGBTNMAP:
341                         return copy_to_user(argp, joydev->keypam,
342                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
343                 default:
344                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
345                                 int len;
346                                 if (!dev->name) return 0;
347                                 len = strlen(dev->name) + 1;
348                                 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
349                                 if (copy_to_user(argp, dev->name, len)) return -EFAULT;
350                                 return len;
351                         }
352         }
353         return -EINVAL;
354 }
355
356 #ifdef CONFIG_COMPAT
357 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
358 {
359         struct joydev_list *list = file->private_data;
360         struct joydev *joydev = list->joydev;
361         void __user *argp = (void __user *)arg;
362         s32 tmp32;
363         struct JS_DATA_SAVE_TYPE_32 ds32;
364         int err;
365
366         if (!joydev->exist) return -ENODEV;
367         switch(cmd) {
368         case JS_SET_TIMELIMIT:
369                 err = get_user(tmp32, (s32 __user *) arg);
370                 if (err == 0)
371                         joydev->glue.JS_TIMELIMIT = tmp32;
372                 break;
373         case JS_GET_TIMELIMIT:
374                 tmp32 = joydev->glue.JS_TIMELIMIT;
375                 err = put_user(tmp32, (s32 __user *) arg);
376                 break;
377
378         case JS_SET_ALL:
379                 err = copy_from_user(&ds32, argp,
380                                      sizeof(ds32)) ? -EFAULT : 0;
381                 if (err == 0) {
382                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
383                         joydev->glue.BUSY          = ds32.BUSY;
384                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
385                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
386                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
387                         joydev->glue.JS_CORR       = ds32.JS_CORR;
388                 }
389                 break;
390
391         case JS_GET_ALL:
392                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
393                 ds32.BUSY          = joydev->glue.BUSY;
394                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
395                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
396                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
397                 ds32.JS_CORR       = joydev->glue.JS_CORR;
398
399                 err = copy_to_user(argp, &ds32,
400                                           sizeof(ds32)) ? -EFAULT : 0;
401                 break;
402
403         default:
404                 err = joydev_ioctl_common(joydev, cmd, argp);
405         }
406         return err;
407 }
408 #endif /* CONFIG_COMPAT */
409
410 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
411 {
412         struct joydev_list *list = file->private_data;
413         struct joydev *joydev = list->joydev;
414         void __user *argp = (void __user *)arg;
415
416         if (!joydev->exist) return -ENODEV;
417
418         switch(cmd) {
419                 case JS_SET_TIMELIMIT:
420                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
421                 case JS_GET_TIMELIMIT:
422                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
423                 case JS_SET_ALL:
424                         return copy_from_user(&joydev->glue, argp,
425                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
426                 case JS_GET_ALL:
427                         return copy_to_user(argp, &joydev->glue,
428                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
429                 default:
430                         return joydev_ioctl_common(joydev, cmd, argp);
431         }
432 }
433
434 static struct file_operations joydev_fops = {
435         .owner =        THIS_MODULE,
436         .read =         joydev_read,
437         .write =        joydev_write,
438         .poll =         joydev_poll,
439         .open =         joydev_open,
440         .release =      joydev_release,
441         .ioctl =        joydev_ioctl,
442 #ifdef CONFIG_COMPAT
443         .compat_ioctl = joydev_compat_ioctl,
444 #endif
445         .fasync =       joydev_fasync,
446 };
447
448 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
449 {
450         struct joydev *joydev;
451         int i, j, t, minor;
452
453         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
454         if (minor == JOYDEV_MINORS) {
455                 printk(KERN_ERR "joydev: no more free joydev devices\n");
456                 return NULL;
457         }
458
459         if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
460                 return NULL;
461         memset(joydev, 0, sizeof(struct joydev));
462
463         INIT_LIST_HEAD(&joydev->list);
464         init_waitqueue_head(&joydev->wait);
465
466         joydev->minor = minor;
467         joydev->exist = 1;
468         joydev->handle.dev = dev;
469         joydev->handle.name = joydev->name;
470         joydev->handle.handler = handler;
471         joydev->handle.private = joydev;
472         sprintf(joydev->name, "js%d", minor);
473
474         for (i = 0; i < ABS_MAX + 1; i++)
475                 if (test_bit(i, dev->absbit)) {
476                         joydev->absmap[i] = joydev->nabs;
477                         joydev->abspam[joydev->nabs] = i;
478                         joydev->nabs++;
479                 }
480
481         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
482                 if (test_bit(i + BTN_MISC, dev->keybit)) {
483                         joydev->keymap[i] = joydev->nkey;
484                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
485                         joydev->nkey++;
486                 }
487
488         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
489                 if (test_bit(i + BTN_MISC, dev->keybit)) {
490                         joydev->keymap[i] = joydev->nkey;
491                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
492                         joydev->nkey++;
493                 }
494
495         for (i = 0; i < joydev->nabs; i++) {
496                 j = joydev->abspam[i];
497                 if (dev->absmax[j] == dev->absmin[j]) {
498                         joydev->corr[i].type = JS_CORR_NONE;
499                         joydev->abs[i] = dev->abs[j];
500                         continue;
501                 }
502                 joydev->corr[i].type = JS_CORR_BROKEN;
503                 joydev->corr[i].prec = dev->absfuzz[j];
504                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
505                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
506                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
507                         continue;
508                 joydev->corr[i].coef[2] = (1 << 29) / t;
509                 joydev->corr[i].coef[3] = (1 << 29) / t;
510
511                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
512         }
513
514         joydev_table[minor] = joydev;
515
516         class_device_create(input_class, NULL,
517                         MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
518                         dev->dev, "js%d", minor);
519
520         return &joydev->handle;
521 }
522
523 static void joydev_disconnect(struct input_handle *handle)
524 {
525         struct joydev *joydev = handle->private;
526         struct joydev_list *list;
527
528         class_device_destroy(input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
529         joydev->exist = 0;
530
531         if (joydev->open) {
532                 input_close_device(handle);
533                 wake_up_interruptible(&joydev->wait);
534                 list_for_each_entry(list, &joydev->list, node)
535                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
536         } else
537                 joydev_free(joydev);
538 }
539
540 static struct input_device_id joydev_blacklist[] = {
541         {
542                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
543                 .evbit = { BIT(EV_KEY) },
544                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
545         },      /* Avoid itouchpads, touchscreens and tablets */
546         { },    /* Terminating entry */
547 };
548
549 static struct input_device_id joydev_ids[] = {
550         {
551                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
552                 .evbit = { BIT(EV_ABS) },
553                 .absbit = { BIT(ABS_X) },
554         },
555         {
556                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
557                 .evbit = { BIT(EV_ABS) },
558                 .absbit = { BIT(ABS_WHEEL) },
559         },
560         {
561                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
562                 .evbit = { BIT(EV_ABS) },
563                 .absbit = { BIT(ABS_THROTTLE) },
564         },
565         { },    /* Terminating entry */
566 };
567
568 MODULE_DEVICE_TABLE(input, joydev_ids);
569
570 static struct input_handler joydev_handler = {
571         .event =        joydev_event,
572         .connect =      joydev_connect,
573         .disconnect =   joydev_disconnect,
574         .fops =         &joydev_fops,
575         .minor =        JOYDEV_MINOR_BASE,
576         .name =         "joydev",
577         .id_table =     joydev_ids,
578         .blacklist =    joydev_blacklist,
579 };
580
581 static int __init joydev_init(void)
582 {
583         input_register_handler(&joydev_handler);
584         return 0;
585 }
586
587 static void __exit joydev_exit(void)
588 {
589         input_unregister_handler(&joydev_handler);
590 }
591
592 module_init(joydev_init);
593 module_exit(joydev_exit);