Input: iforce - use wait_event_interruptible_timeout
[linux-2.6] / 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 #include <linux/devfs_fs_kernel.h>
30
31 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
32 MODULE_DESCRIPTION("Joystick device interfaces");
33 MODULE_SUPPORTED_DEVICE("input/js");
34 MODULE_LICENSE("GPL");
35
36 #define JOYDEV_MINOR_BASE       0
37 #define JOYDEV_MINORS           16
38 #define JOYDEV_BUFFER_SIZE      64
39
40 struct joydev {
41         int exist;
42         int open;
43         int minor;
44         char name[16];
45         struct input_handle handle;
46         wait_queue_head_t wait;
47         struct list_head list;
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_list {
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         if (value < -32767) return -32767;
86         if (value >  32767) return  32767;
87
88         return value;
89 }
90
91 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
92 {
93         struct joydev *joydev = handle->private;
94         struct joydev_list *list;
95         struct js_event event;
96
97         switch (type) {
98
99                 case EV_KEY:
100                         if (code < BTN_MISC || value == 2) return;
101                         event.type = JS_EVENT_BUTTON;
102                         event.number = joydev->keymap[code - BTN_MISC];
103                         event.value = value;
104                         break;
105
106                 case EV_ABS:
107                         event.type = JS_EVENT_AXIS;
108                         event.number = joydev->absmap[code];
109                         event.value = joydev_correct(value, joydev->corr + event.number);
110                         if (event.value == joydev->abs[event.number]) return;
111                         joydev->abs[event.number] = event.value;
112                         break;
113
114                 default:
115                         return;
116         }
117
118         event.time = jiffies_to_msecs(jiffies);
119
120         list_for_each_entry(list, &joydev->list, node) {
121
122                 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
123
124                 if (list->startup == joydev->nabs + joydev->nkey)
125                         if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
126                                 list->startup = 0;
127
128                 kill_fasync(&list->fasync, SIGIO, POLL_IN);
129         }
130
131         wake_up_interruptible(&joydev->wait);
132 }
133
134 static int joydev_fasync(int fd, struct file *file, int on)
135 {
136         int retval;
137         struct joydev_list *list = file->private_data;
138         retval = fasync_helper(fd, file, on, &list->fasync);
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 = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
176                 return -ENOMEM;
177         memset(list, 0, sizeof(struct joydev_list));
178
179         list->joydev = joydev_table[i];
180         list_add_tail(&list->node, &joydev_table[i]->list);
181         file->private_data = list;
182
183         if (!list->joydev->open++)
184                 if (list->joydev->exist)
185                         input_open_device(&list->joydev->handle);
186
187         return 0;
188 }
189
190 static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
191 {
192         return -EINVAL;
193 }
194
195 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
196 {
197         struct joydev_list *list = file->private_data;
198         struct joydev *joydev = list->joydev;
199         struct input_dev *input = joydev->handle.dev;
200         int retval = 0;
201
202         if (!list->joydev->exist)
203                 return -ENODEV;
204
205         if (count < sizeof(struct js_event))
206                 return -EINVAL;
207
208         if (count == sizeof(struct JS_DATA_TYPE)) {
209
210                 struct JS_DATA_TYPE data;
211                 int i;
212
213                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
214                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
215                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
216                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
217
218                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
219                         return -EFAULT;
220
221                 list->startup = 0;
222                 list->tail = list->head;
223
224                 return sizeof(struct JS_DATA_TYPE);
225         }
226
227         if (list->startup == joydev->nabs + joydev->nkey
228                 && list->head == list->tail && (file->f_flags & O_NONBLOCK))
229                         return -EAGAIN;
230
231         retval = wait_event_interruptible(list->joydev->wait,
232                                           !list->joydev->exist ||
233                                           list->startup < joydev->nabs + joydev->nkey ||
234                                           list->head != list->tail);
235
236         if (retval)
237                 return retval;
238
239         if (!list->joydev->exist)
240                 return -ENODEV;
241
242         while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
243
244                 struct js_event event;
245
246                 event.time = jiffies_to_msecs(jiffies);
247
248                 if (list->startup < joydev->nkey) {
249                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
250                         event.number = list->startup;
251                         event.value = !!test_bit(joydev->keypam[event.number], input->key);
252                 } else {
253                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
254                         event.number = list->startup - joydev->nkey;
255                         event.value = joydev->abs[event.number];
256                 }
257
258                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
259                         return -EFAULT;
260
261                 list->startup++;
262                 retval += sizeof(struct js_event);
263         }
264
265         while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
266
267                 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
268                         return -EFAULT;
269
270                 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
271                 retval += sizeof(struct js_event);
272         }
273
274         return retval;
275 }
276
277 /* No kernel lock - fine */
278 static unsigned int joydev_poll(struct file *file, poll_table *wait)
279 {
280         struct joydev_list *list = file->private_data;
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                 case JS_GET_CAL:
297                         return copy_to_user(argp, &joydev->glue.JS_CORR,
298                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
299                 case JS_SET_TIMEOUT:
300                         return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
301                 case JS_GET_TIMEOUT:
302                         return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
303
304                 case JSIOCGVERSION:
305                         return put_user(JS_VERSION, (__u32 __user *) argp);
306                 case JSIOCGAXES:
307                         return put_user(joydev->nabs, (__u8 __user *) argp);
308                 case JSIOCGBUTTONS:
309                         return put_user(joydev->nkey, (__u8 __user *) argp);
310                 case JSIOCSCORR:
311                         if (copy_from_user(joydev->corr, argp,
312                                       sizeof(joydev->corr[0]) * joydev->nabs))
313                             return -EFAULT;
314                         for (i = 0; i < joydev->nabs; i++) {
315                                 j = joydev->abspam[i];
316                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
317                         }
318                         return 0;
319                 case JSIOCGCORR:
320                         return copy_to_user(argp, joydev->corr,
321                                                 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
322                 case JSIOCSAXMAP:
323                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
324                                 return -EFAULT;
325                         for (i = 0; i < joydev->nabs; i++) {
326                                 if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
327                                 joydev->absmap[joydev->abspam[i]] = i;
328                         }
329                         return 0;
330                 case JSIOCGAXMAP:
331                         return copy_to_user(argp, joydev->abspam,
332                                                 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
333                 case JSIOCSBTNMAP:
334                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
335                                 return -EFAULT;
336                         for (i = 0; i < joydev->nkey; i++) {
337                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
338                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
339                         }
340                         return 0;
341                 case JSIOCGBTNMAP:
342                         return copy_to_user(argp, joydev->keypam,
343                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
344                 default:
345                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
346                                 int len;
347                                 if (!dev->name) return 0;
348                                 len = strlen(dev->name) + 1;
349                                 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
350                                 if (copy_to_user(argp, dev->name, len)) return -EFAULT;
351                                 return len;
352                         }
353         }
354         return -EINVAL;
355 }
356
357 #ifdef CONFIG_COMPAT
358 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
359 {
360         struct joydev_list *list = file->private_data;
361         struct joydev *joydev = list->joydev;
362         void __user *argp = (void __user *)arg;
363         s32 tmp32;
364         struct JS_DATA_SAVE_TYPE_32 ds32;
365         int err;
366
367         if (!joydev->exist) return -ENODEV;
368         switch(cmd) {
369         case JS_SET_TIMELIMIT:
370                 err = get_user(tmp32, (s32 __user *) arg);
371                 if (err == 0)
372                         joydev->glue.JS_TIMELIMIT = tmp32;
373                 break;
374         case JS_GET_TIMELIMIT:
375                 tmp32 = joydev->glue.JS_TIMELIMIT;
376                 err = put_user(tmp32, (s32 __user *) arg);
377                 break;
378
379         case JS_SET_ALL:
380                 err = copy_from_user(&ds32, argp,
381                                      sizeof(ds32)) ? -EFAULT : 0;
382                 if (err == 0) {
383                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
384                         joydev->glue.BUSY          = ds32.BUSY;
385                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
386                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
387                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
388                         joydev->glue.JS_CORR       = ds32.JS_CORR;
389                 }
390                 break;
391
392         case JS_GET_ALL:
393                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
394                 ds32.BUSY          = joydev->glue.BUSY;
395                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
396                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
397                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
398                 ds32.JS_CORR       = joydev->glue.JS_CORR;
399
400                 err = copy_to_user(argp, &ds32,
401                                           sizeof(ds32)) ? -EFAULT : 0;
402                 break;
403
404         default:
405                 err = joydev_ioctl_common(joydev, cmd, argp);
406         }
407         return err;
408 }
409 #endif /* CONFIG_COMPAT */
410
411 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
412 {
413         struct joydev_list *list = file->private_data;
414         struct joydev *joydev = list->joydev;
415         void __user *argp = (void __user *)arg;
416
417         if (!joydev->exist) return -ENODEV;
418
419         switch(cmd) {
420                 case JS_SET_TIMELIMIT:
421                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
422                 case JS_GET_TIMELIMIT:
423                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
424                 case JS_SET_ALL:
425                         return copy_from_user(&joydev->glue, argp,
426                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
427                 case JS_GET_ALL:
428                         return copy_to_user(argp, &joydev->glue,
429                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
430                 default:
431                         return joydev_ioctl_common(joydev, cmd, argp);
432         }
433 }
434
435 static struct file_operations joydev_fops = {
436         .owner =        THIS_MODULE,
437         .read =         joydev_read,
438         .write =        joydev_write,
439         .poll =         joydev_poll,
440         .open =         joydev_open,
441         .release =      joydev_release,
442         .ioctl =        joydev_ioctl,
443 #ifdef CONFIG_COMPAT
444         .compat_ioctl = joydev_compat_ioctl,
445 #endif
446         .fasync =       joydev_fasync,
447 };
448
449 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
450 {
451         struct joydev *joydev;
452         int i, j, t, minor;
453
454         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
455         if (minor == JOYDEV_MINORS) {
456                 printk(KERN_ERR "joydev: no more free joydev devices\n");
457                 return NULL;
458         }
459
460         if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
461                 return NULL;
462         memset(joydev, 0, sizeof(struct joydev));
463
464         INIT_LIST_HEAD(&joydev->list);
465         init_waitqueue_head(&joydev->wait);
466
467         joydev->minor = minor;
468         joydev->exist = 1;
469         joydev->handle.dev = dev;
470         joydev->handle.name = joydev->name;
471         joydev->handle.handler = handler;
472         joydev->handle.private = joydev;
473         sprintf(joydev->name, "js%d", minor);
474
475         for (i = 0; i < ABS_MAX + 1; i++)
476                 if (test_bit(i, dev->absbit)) {
477                         joydev->absmap[i] = joydev->nabs;
478                         joydev->abspam[joydev->nabs] = i;
479                         joydev->nabs++;
480                 }
481
482         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
483                 if (test_bit(i + BTN_MISC, dev->keybit)) {
484                         joydev->keymap[i] = joydev->nkey;
485                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
486                         joydev->nkey++;
487                 }
488
489         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
490                 if (test_bit(i + BTN_MISC, dev->keybit)) {
491                         joydev->keymap[i] = joydev->nkey;
492                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
493                         joydev->nkey++;
494                 }
495
496         for (i = 0; i < joydev->nabs; i++) {
497                 j = joydev->abspam[i];
498                 if (dev->absmax[j] == dev->absmin[j]) {
499                         joydev->corr[i].type = JS_CORR_NONE;
500                         joydev->abs[i] = dev->abs[j];
501                         continue;
502                 }
503                 joydev->corr[i].type = JS_CORR_BROKEN;
504                 joydev->corr[i].prec = dev->absfuzz[j];
505                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
506                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
507                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
508                         continue;
509                 joydev->corr[i].coef[2] = (1 << 29) / t;
510                 joydev->corr[i].coef[3] = (1 << 29) / t;
511
512                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
513         }
514
515         joydev_table[minor] = joydev;
516
517         devfs_mk_cdev(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
518                         S_IFCHR|S_IRUGO|S_IWUSR, "input/js%d", minor);
519         class_device_create(input_class,
520                         MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
521                         dev->dev, "js%d", minor);
522
523         return &joydev->handle;
524 }
525
526 static void joydev_disconnect(struct input_handle *handle)
527 {
528         struct joydev *joydev = handle->private;
529         struct joydev_list *list;
530
531         class_device_destroy(input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
532         devfs_remove("input/js%d", joydev->minor);
533         joydev->exist = 0;
534
535         if (joydev->open) {
536                 input_close_device(handle);
537                 wake_up_interruptible(&joydev->wait);
538                 list_for_each_entry(list, &joydev->list, node)
539                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
540         } else
541                 joydev_free(joydev);
542 }
543
544 static struct input_device_id joydev_blacklist[] = {
545         {
546                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
547                 .evbit = { BIT(EV_KEY) },
548                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
549         },      /* Avoid itouchpads, touchscreens and tablets */
550         { },    /* Terminating entry */
551 };
552
553 static struct input_device_id joydev_ids[] = {
554         {
555                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
556                 .evbit = { BIT(EV_ABS) },
557                 .absbit = { BIT(ABS_X) },
558         },
559         {
560                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
561                 .evbit = { BIT(EV_ABS) },
562                 .absbit = { BIT(ABS_WHEEL) },
563         },
564         {
565                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
566                 .evbit = { BIT(EV_ABS) },
567                 .absbit = { BIT(ABS_THROTTLE) },
568         },
569         { },    /* Terminating entry */
570 };
571
572 MODULE_DEVICE_TABLE(input, joydev_ids);
573
574 static struct input_handler joydev_handler = {
575         .event =        joydev_event,
576         .connect =      joydev_connect,
577         .disconnect =   joydev_disconnect,
578         .fops =         &joydev_fops,
579         .minor =        JOYDEV_MINOR_BASE,
580         .name =         "joydev",
581         .id_table =     joydev_ids,
582         .blacklist =    joydev_blacklist,
583 };
584
585 static int __init joydev_init(void)
586 {
587         input_register_handler(&joydev_handler);
588         return 0;
589 }
590
591 static void __exit joydev_exit(void)
592 {
593         input_unregister_handler(&joydev_handler);
594 }
595
596 module_init(joydev_init);
597 module_exit(joydev_exit);