Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/dtor/input.git manually
[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 #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 #define MSECS(t)        (1000 * ((t) / HZ) + 1000 * ((t) % HZ) / HZ)
41
42 struct joydev {
43         int exist;
44         int open;
45         int minor;
46         char name[16];
47         struct input_handle handle;
48         wait_queue_head_t wait;
49         struct list_head list;
50         struct js_corr corr[ABS_MAX + 1];
51         struct JS_DATA_SAVE_TYPE glue;
52         int nabs;
53         int nkey;
54         __u16 keymap[KEY_MAX - BTN_MISC + 1];
55         __u16 keypam[KEY_MAX - BTN_MISC + 1];
56         __u8 absmap[ABS_MAX + 1];
57         __u8 abspam[ABS_MAX + 1];
58         __s16 abs[ABS_MAX + 1];
59 };
60
61 struct joydev_list {
62         struct js_event buffer[JOYDEV_BUFFER_SIZE];
63         int head;
64         int tail;
65         int startup;
66         struct fasync_struct *fasync;
67         struct joydev *joydev;
68         struct list_head node;
69 };
70
71 static struct joydev *joydev_table[JOYDEV_MINORS];
72
73 static int joydev_correct(int value, struct js_corr *corr)
74 {
75         switch (corr->type) {
76                 case JS_CORR_NONE:
77                         break;
78                 case JS_CORR_BROKEN:
79                         value = value > corr->coef[0] ? (value < corr->coef[1] ? 0 :
80                                 ((corr->coef[3] * (value - corr->coef[1])) >> 14)) :
81                                 ((corr->coef[2] * (value - corr->coef[0])) >> 14);
82                         break;
83                 default:
84                         return 0;
85         }
86
87         if (value < -32767) return -32767;
88         if (value >  32767) return  32767;
89
90         return value;
91 }
92
93 static void joydev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
94 {
95         struct joydev *joydev = handle->private;
96         struct joydev_list *list;
97         struct js_event event;
98
99         switch (type) {
100
101                 case EV_KEY:
102                         if (code < BTN_MISC || value == 2) return;
103                         event.type = JS_EVENT_BUTTON;
104                         event.number = joydev->keymap[code - BTN_MISC];
105                         event.value = value;
106                         break;
107
108                 case EV_ABS:
109                         event.type = JS_EVENT_AXIS;
110                         event.number = joydev->absmap[code];
111                         event.value = joydev_correct(value, joydev->corr + event.number);
112                         if (event.value == joydev->abs[event.number]) return;
113                         joydev->abs[event.number] = event.value;
114                         break;
115
116                 default:
117                         return;
118         }
119
120         event.time = MSECS(jiffies);
121
122         list_for_each_entry(list, &joydev->list, node) {
123
124                 memcpy(list->buffer + list->head, &event, sizeof(struct js_event));
125
126                 if (list->startup == joydev->nabs + joydev->nkey)
127                         if (list->tail == (list->head = (list->head + 1) & (JOYDEV_BUFFER_SIZE - 1)))
128                                 list->startup = 0;
129
130                 kill_fasync(&list->fasync, SIGIO, POLL_IN);
131         }
132
133         wake_up_interruptible(&joydev->wait);
134 }
135
136 static int joydev_fasync(int fd, struct file *file, int on)
137 {
138         int retval;
139         struct joydev_list *list = file->private_data;
140         retval = fasync_helper(fd, file, on, &list->fasync);
141         return retval < 0 ? retval : 0;
142 }
143
144 static void joydev_free(struct joydev *joydev)
145 {
146         joydev_table[joydev->minor] = NULL;
147         kfree(joydev);
148 }
149
150 static int joydev_release(struct inode * inode, struct file * file)
151 {
152         struct joydev_list *list = file->private_data;
153
154         joydev_fasync(-1, file, 0);
155
156         list_del(&list->node);
157
158         if (!--list->joydev->open) {
159                 if (list->joydev->exist)
160                         input_close_device(&list->joydev->handle);
161                 else
162                         joydev_free(list->joydev);
163         }
164
165         kfree(list);
166         return 0;
167 }
168
169 static int joydev_open(struct inode *inode, struct file *file)
170 {
171         struct joydev_list *list;
172         int i = iminor(inode) - JOYDEV_MINOR_BASE;
173
174         if (i >= JOYDEV_MINORS || !joydev_table[i])
175                 return -ENODEV;
176
177         if (!(list = kmalloc(sizeof(struct joydev_list), GFP_KERNEL)))
178                 return -ENOMEM;
179         memset(list, 0, sizeof(struct joydev_list));
180
181         list->joydev = joydev_table[i];
182         list_add_tail(&list->node, &joydev_table[i]->list);
183         file->private_data = list;
184
185         if (!list->joydev->open++)
186                 if (list->joydev->exist)
187                         input_open_device(&list->joydev->handle);
188
189         return 0;
190 }
191
192 static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
193 {
194         return -EINVAL;
195 }
196
197 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
198 {
199         struct joydev_list *list = file->private_data;
200         struct joydev *joydev = list->joydev;
201         struct input_dev *input = joydev->handle.dev;
202         int retval = 0;
203
204         if (!list->joydev->exist)
205                 return -ENODEV;
206
207         if (count < sizeof(struct js_event))
208                 return -EINVAL;
209
210         if (count == sizeof(struct JS_DATA_TYPE)) {
211
212                 struct JS_DATA_TYPE data;
213                 int i;
214
215                 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
216                         data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
217                 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
218                 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
219
220                 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
221                         return -EFAULT;
222
223                 list->startup = 0;
224                 list->tail = list->head;
225
226                 return sizeof(struct JS_DATA_TYPE);
227         }
228
229         if (list->startup == joydev->nabs + joydev->nkey
230                 && list->head == list->tail && (file->f_flags & O_NONBLOCK))
231                         return -EAGAIN;
232
233         retval = wait_event_interruptible(list->joydev->wait,
234                                           !list->joydev->exist ||
235                                           list->startup < joydev->nabs + joydev->nkey ||
236                                           list->head != list->tail);
237
238         if (retval)
239                 return retval;
240
241         if (!list->joydev->exist)
242                 return -ENODEV;
243
244         while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
245
246                 struct js_event event;
247
248                 event.time = MSECS(jiffies);
249
250                 if (list->startup < joydev->nkey) {
251                         event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
252                         event.number = list->startup;
253                         event.value = !!test_bit(joydev->keypam[event.number], input->key);
254                 } else {
255                         event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
256                         event.number = list->startup - joydev->nkey;
257                         event.value = joydev->abs[event.number];
258                 }
259
260                 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
261                         return -EFAULT;
262
263                 list->startup++;
264                 retval += sizeof(struct js_event);
265         }
266
267         while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
268
269                 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
270                         return -EFAULT;
271
272                 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
273                 retval += sizeof(struct js_event);
274         }
275
276         return retval;
277 }
278
279 /* No kernel lock - fine */
280 static unsigned int joydev_poll(struct file *file, poll_table *wait)
281 {
282         struct joydev_list *list = file->private_data;
283         poll_wait(file, &list->joydev->wait, wait);
284         return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ? 
285                 (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR));
286 }
287
288 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
289 {
290         struct input_dev *dev = joydev->handle.dev;
291         int i, j;
292
293         switch (cmd) {
294
295                 case JS_SET_CAL:
296                         return copy_from_user(&joydev->glue.JS_CORR, argp,
297                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
298                 case JS_GET_CAL:
299                         return copy_to_user(argp, &joydev->glue.JS_CORR,
300                                 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
301                 case JS_SET_TIMEOUT:
302                         return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
303                 case JS_GET_TIMEOUT:
304                         return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
305
306                 case JSIOCGVERSION:
307                         return put_user(JS_VERSION, (__u32 __user *) argp);
308                 case JSIOCGAXES:
309                         return put_user(joydev->nabs, (__u8 __user *) argp);
310                 case JSIOCGBUTTONS:
311                         return put_user(joydev->nkey, (__u8 __user *) argp);
312                 case JSIOCSCORR:
313                         if (copy_from_user(joydev->corr, argp,
314                                       sizeof(joydev->corr[0]) * joydev->nabs))
315                             return -EFAULT;
316                         for (i = 0; i < joydev->nabs; i++) {
317                                 j = joydev->abspam[i];
318                                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
319                         }
320                         return 0;
321                 case JSIOCGCORR:
322                         return copy_to_user(argp, joydev->corr,
323                                                 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
324                 case JSIOCSAXMAP:
325                         if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
326                                 return -EFAULT;
327                         for (i = 0; i < joydev->nabs; i++) {
328                                 if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
329                                 joydev->absmap[joydev->abspam[i]] = i;
330                         }
331                         return 0;
332                 case JSIOCGAXMAP:
333                         return copy_to_user(argp, joydev->abspam,
334                                                 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
335                 case JSIOCSBTNMAP:
336                         if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
337                                 return -EFAULT;
338                         for (i = 0; i < joydev->nkey; i++) {
339                                 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
340                                 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
341                         }
342                         return 0;
343                 case JSIOCGBTNMAP:
344                         return copy_to_user(argp, joydev->keypam,
345                                                 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
346                 default:
347                         if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
348                                 int len;
349                                 if (!dev->name) return 0;
350                                 len = strlen(dev->name) + 1;
351                                 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
352                                 if (copy_to_user(argp, dev->name, len)) return -EFAULT;
353                                 return len;
354                         }
355         }
356         return -EINVAL;
357 }
358
359 #ifdef CONFIG_COMPAT
360 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
361 {
362         struct joydev_list *list = file->private_data;
363         struct joydev *joydev = list->joydev;
364         void __user *argp = (void __user *)arg;
365         s32 tmp32;
366         struct JS_DATA_SAVE_TYPE_32 ds32;
367         int err;
368
369         if (!joydev->exist) return -ENODEV;
370         switch(cmd) {
371         case JS_SET_TIMELIMIT:
372                 err = get_user(tmp32, (s32 __user *) arg);
373                 if (err == 0)
374                         joydev->glue.JS_TIMELIMIT = tmp32;
375                 break;
376         case JS_GET_TIMELIMIT:
377                 tmp32 = joydev->glue.JS_TIMELIMIT;
378                 err = put_user(tmp32, (s32 __user *) arg);
379                 break;
380
381         case JS_SET_ALL:
382                 err = copy_from_user(&ds32, argp,
383                                      sizeof(ds32)) ? -EFAULT : 0;
384                 if (err == 0) {
385                         joydev->glue.JS_TIMEOUT    = ds32.JS_TIMEOUT;
386                         joydev->glue.BUSY          = ds32.BUSY;
387                         joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
388                         joydev->glue.JS_TIMELIMIT  = ds32.JS_TIMELIMIT;
389                         joydev->glue.JS_SAVE       = ds32.JS_SAVE;
390                         joydev->glue.JS_CORR       = ds32.JS_CORR;
391                 }
392                 break;
393
394         case JS_GET_ALL:
395                 ds32.JS_TIMEOUT    = joydev->glue.JS_TIMEOUT;
396                 ds32.BUSY          = joydev->glue.BUSY;
397                 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
398                 ds32.JS_TIMELIMIT  = joydev->glue.JS_TIMELIMIT;
399                 ds32.JS_SAVE       = joydev->glue.JS_SAVE;
400                 ds32.JS_CORR       = joydev->glue.JS_CORR;
401
402                 err = copy_to_user(argp, &ds32,
403                                           sizeof(ds32)) ? -EFAULT : 0;
404                 break;
405
406         default:
407                 err = joydev_ioctl_common(joydev, cmd, argp);
408         }
409         return err;
410 }
411 #endif /* CONFIG_COMPAT */
412
413 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
414 {
415         struct joydev_list *list = file->private_data;
416         struct joydev *joydev = list->joydev;
417         void __user *argp = (void __user *)arg;
418
419         if (!joydev->exist) return -ENODEV;
420
421         switch(cmd) {
422                 case JS_SET_TIMELIMIT:
423                         return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
424                 case JS_GET_TIMELIMIT:
425                         return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
426                 case JS_SET_ALL:
427                         return copy_from_user(&joydev->glue, argp,
428                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
429                 case JS_GET_ALL:
430                         return copy_to_user(argp, &joydev->glue,
431                                                 sizeof(joydev->glue)) ? -EFAULT : 0;
432                 default:
433                         return joydev_ioctl_common(joydev, cmd, argp);
434         }
435 }
436
437 static struct file_operations joydev_fops = {
438         .owner =        THIS_MODULE,
439         .read =         joydev_read,
440         .write =        joydev_write,
441         .poll =         joydev_poll,
442         .open =         joydev_open,
443         .release =      joydev_release,
444         .ioctl =        joydev_ioctl,
445 #ifdef CONFIG_COMPAT
446         .compat_ioctl = joydev_compat_ioctl,
447 #endif
448         .fasync =       joydev_fasync,
449 };
450
451 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
452 {
453         struct joydev *joydev;
454         int i, j, t, minor;
455
456         for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++);
457         if (minor == JOYDEV_MINORS) {
458                 printk(KERN_ERR "joydev: no more free joydev devices\n");
459                 return NULL;
460         }
461
462         if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL)))
463                 return NULL;
464         memset(joydev, 0, sizeof(struct joydev));
465
466         INIT_LIST_HEAD(&joydev->list);
467         init_waitqueue_head(&joydev->wait);
468
469         joydev->minor = minor;
470         joydev->exist = 1;
471         joydev->handle.dev = dev;
472         joydev->handle.name = joydev->name;
473         joydev->handle.handler = handler;
474         joydev->handle.private = joydev;
475         sprintf(joydev->name, "js%d", minor);
476
477         for (i = 0; i < ABS_MAX + 1; i++)
478                 if (test_bit(i, dev->absbit)) {
479                         joydev->absmap[i] = joydev->nabs;
480                         joydev->abspam[joydev->nabs] = i;
481                         joydev->nabs++;
482                 }
483
484         for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
485                 if (test_bit(i + BTN_MISC, dev->keybit)) {
486                         joydev->keymap[i] = joydev->nkey;
487                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
488                         joydev->nkey++;
489                 }
490
491         for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
492                 if (test_bit(i + BTN_MISC, dev->keybit)) {
493                         joydev->keymap[i] = joydev->nkey;
494                         joydev->keypam[joydev->nkey] = i + BTN_MISC;
495                         joydev->nkey++;
496                 }
497
498         for (i = 0; i < joydev->nabs; i++) {
499                 j = joydev->abspam[i];
500                 if (dev->absmax[j] == dev->absmin[j]) {
501                         joydev->corr[i].type = JS_CORR_NONE;
502                         joydev->abs[i] = dev->abs[j];
503                         continue;
504                 }
505                 joydev->corr[i].type = JS_CORR_BROKEN;
506                 joydev->corr[i].prec = dev->absfuzz[j];
507                 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
508                 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
509                 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
510                         continue;
511                 joydev->corr[i].coef[2] = (1 << 29) / t;
512                 joydev->corr[i].coef[3] = (1 << 29) / t;
513
514                 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
515         }
516
517         joydev_table[minor] = joydev;
518
519         devfs_mk_cdev(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
520                         S_IFCHR|S_IRUGO|S_IWUSR, "input/js%d", minor);
521         class_device_create(input_class,
522                         MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
523                         dev->dev, "js%d", minor);
524
525         return &joydev->handle;
526 }
527
528 static void joydev_disconnect(struct input_handle *handle)
529 {
530         struct joydev *joydev = handle->private;
531         struct joydev_list *list;
532
533         class_device_destroy(input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor));
534         devfs_remove("input/js%d", joydev->minor);
535         joydev->exist = 0;
536
537         if (joydev->open) {
538                 input_close_device(handle);
539                 wake_up_interruptible(&joydev->wait);
540                 list_for_each_entry(list, &joydev->list, node)
541                         kill_fasync(&list->fasync, SIGIO, POLL_HUP);
542         } else
543                 joydev_free(joydev);
544 }
545
546 static struct input_device_id joydev_blacklist[] = {
547         {
548                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT,
549                 .evbit = { BIT(EV_KEY) },
550                 .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) },
551         },      /* Avoid itouchpads, touchscreens and tablets */
552         { },    /* Terminating entry */
553 };
554
555 static struct input_device_id joydev_ids[] = {
556         {
557                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
558                 .evbit = { BIT(EV_ABS) },
559                 .absbit = { BIT(ABS_X) },
560         },
561         {
562                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
563                 .evbit = { BIT(EV_ABS) },
564                 .absbit = { BIT(ABS_WHEEL) },
565         },
566         {
567                 .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT,
568                 .evbit = { BIT(EV_ABS) },
569                 .absbit = { BIT(ABS_THROTTLE) },
570         },
571         { },    /* Terminating entry */
572 };
573
574 MODULE_DEVICE_TABLE(input, joydev_ids);
575
576 static struct input_handler joydev_handler = {
577         .event =        joydev_event,
578         .connect =      joydev_connect,
579         .disconnect =   joydev_disconnect,
580         .fops =         &joydev_fops,
581         .minor =        JOYDEV_MINOR_BASE,
582         .name =         "joydev",
583         .id_table =     joydev_ids,
584         .blacklist =    joydev_blacklist,
585 };
586
587 static int __init joydev_init(void)
588 {
589         input_register_handler(&joydev_handler);
590         return 0;
591 }
592
593 static void __exit joydev_exit(void)
594 {
595         input_unregister_handler(&joydev_handler);
596 }
597
598 module_init(joydev_init);
599 module_exit(joydev_exit);