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 = kzalloc(sizeof(struct joydev_list), GFP_KERNEL)))
175 return -ENOMEM;
176
177 list->joydev = joydev_table[i];
178 list_add_tail(&list->node, &joydev_table[i]->list);
179 file->private_data = list;
180
181 if (!list->joydev->open++)
182 if (list->joydev->exist)
183 input_open_device(&list->joydev->handle);
184
185 return 0;
186 }
187
188 static ssize_t joydev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
189 {
190 return -EINVAL;
191 }
192
193 static ssize_t joydev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
194 {
195 struct joydev_list *list = file->private_data;
196 struct joydev *joydev = list->joydev;
197 struct input_dev *input = joydev->handle.dev;
198 int retval = 0;
199
200 if (!list->joydev->exist)
201 return -ENODEV;
202
203 if (count < sizeof(struct js_event))
204 return -EINVAL;
205
206 if (count == sizeof(struct JS_DATA_TYPE)) {
207
208 struct JS_DATA_TYPE data;
209 int i;
210
211 for (data.buttons = i = 0; i < 32 && i < joydev->nkey; i++)
212 data.buttons |= test_bit(joydev->keypam[i], input->key) ? (1 << i) : 0;
213 data.x = (joydev->abs[0] / 256 + 128) >> joydev->glue.JS_CORR.x;
214 data.y = (joydev->abs[1] / 256 + 128) >> joydev->glue.JS_CORR.y;
215
216 if (copy_to_user(buf, &data, sizeof(struct JS_DATA_TYPE)))
217 return -EFAULT;
218
219 list->startup = 0;
220 list->tail = list->head;
221
222 return sizeof(struct JS_DATA_TYPE);
223 }
224
225 if (list->startup == joydev->nabs + joydev->nkey
226 && list->head == list->tail && (file->f_flags & O_NONBLOCK))
227 return -EAGAIN;
228
229 retval = wait_event_interruptible(list->joydev->wait,
230 !list->joydev->exist ||
231 list->startup < joydev->nabs + joydev->nkey ||
232 list->head != list->tail);
233
234 if (retval)
235 return retval;
236
237 if (!list->joydev->exist)
238 return -ENODEV;
239
240 while (list->startup < joydev->nabs + joydev->nkey && retval + sizeof(struct js_event) <= count) {
241
242 struct js_event event;
243
244 event.time = jiffies_to_msecs(jiffies);
245
246 if (list->startup < joydev->nkey) {
247 event.type = JS_EVENT_BUTTON | JS_EVENT_INIT;
248 event.number = list->startup;
249 event.value = !!test_bit(joydev->keypam[event.number], input->key);
250 } else {
251 event.type = JS_EVENT_AXIS | JS_EVENT_INIT;
252 event.number = list->startup - joydev->nkey;
253 event.value = joydev->abs[event.number];
254 }
255
256 if (copy_to_user(buf + retval, &event, sizeof(struct js_event)))
257 return -EFAULT;
258
259 list->startup++;
260 retval += sizeof(struct js_event);
261 }
262
263 while (list->head != list->tail && retval + sizeof(struct js_event) <= count) {
264
265 if (copy_to_user(buf + retval, list->buffer + list->tail, sizeof(struct js_event)))
266 return -EFAULT;
267
268 list->tail = (list->tail + 1) & (JOYDEV_BUFFER_SIZE - 1);
269 retval += sizeof(struct js_event);
270 }
271
272 return retval;
273 }
274
275 /* No kernel lock - fine */
276 static unsigned int joydev_poll(struct file *file, poll_table *wait)
277 {
278 struct joydev_list *list = file->private_data;
279 poll_wait(file, &list->joydev->wait, wait);
280 return ((list->head != list->tail || list->startup < list->joydev->nabs + list->joydev->nkey) ?
281 (POLLIN | POLLRDNORM) : 0) | (list->joydev->exist ? 0 : (POLLHUP | POLLERR));
282 }
283
284 static int joydev_ioctl_common(struct joydev *joydev, unsigned int cmd, void __user *argp)
285 {
286 struct input_dev *dev = joydev->handle.dev;
287 int i, j;
288
289 switch (cmd) {
290
291 case JS_SET_CAL:
292 return copy_from_user(&joydev->glue.JS_CORR, argp,
293 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
294 case JS_GET_CAL:
295 return copy_to_user(argp, &joydev->glue.JS_CORR,
296 sizeof(joydev->glue.JS_CORR)) ? -EFAULT : 0;
297 case JS_SET_TIMEOUT:
298 return get_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
299 case JS_GET_TIMEOUT:
300 return put_user(joydev->glue.JS_TIMEOUT, (s32 __user *) argp);
301
302 case JSIOCGVERSION:
303 return put_user(JS_VERSION, (__u32 __user *) argp);
304 case JSIOCGAXES:
305 return put_user(joydev->nabs, (__u8 __user *) argp);
306 case JSIOCGBUTTONS:
307 return put_user(joydev->nkey, (__u8 __user *) argp);
308 case JSIOCSCORR:
309 if (copy_from_user(joydev->corr, argp,
310 sizeof(joydev->corr[0]) * joydev->nabs))
311 return -EFAULT;
312 for (i = 0; i < joydev->nabs; i++) {
313 j = joydev->abspam[i];
314 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
315 }
316 return 0;
317 case JSIOCGCORR:
318 return copy_to_user(argp, joydev->corr,
319 sizeof(joydev->corr[0]) * joydev->nabs) ? -EFAULT : 0;
320 case JSIOCSAXMAP:
321 if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1)))
322 return -EFAULT;
323 for (i = 0; i < joydev->nabs; i++) {
324 if (joydev->abspam[i] > ABS_MAX) return -EINVAL;
325 joydev->absmap[joydev->abspam[i]] = i;
326 }
327 return 0;
328 case JSIOCGAXMAP:
329 return copy_to_user(argp, joydev->abspam,
330 sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0;
331 case JSIOCSBTNMAP:
332 if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)))
333 return -EFAULT;
334 for (i = 0; i < joydev->nkey; i++) {
335 if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL;
336 joydev->keymap[joydev->keypam[i] - BTN_MISC] = i;
337 }
338 return 0;
339 case JSIOCGBTNMAP:
340 return copy_to_user(argp, joydev->keypam,
341 sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0;
342 default:
343 if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) {
344 int len;
345 if (!dev->name) return 0;
346 len = strlen(dev->name) + 1;
347 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
348 if (copy_to_user(argp, dev->name, len)) return -EFAULT;
349 return len;
350 }
351 }
352 return -EINVAL;
353 }
354
355 #ifdef CONFIG_COMPAT
356 static long joydev_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
357 {
358 struct joydev_list *list = file->private_data;
359 struct joydev *joydev = list->joydev;
360 void __user *argp = (void __user *)arg;
361 s32 tmp32;
362 struct JS_DATA_SAVE_TYPE_32 ds32;
363 int err;
364
365 if (!joydev->exist) return -ENODEV;
366 switch(cmd) {
367 case JS_SET_TIMELIMIT:
368 err = get_user(tmp32, (s32 __user *) arg);
369 if (err == 0)
370 joydev->glue.JS_TIMELIMIT = tmp32;
371 break;
372 case JS_GET_TIMELIMIT:
373 tmp32 = joydev->glue.JS_TIMELIMIT;
374 err = put_user(tmp32, (s32 __user *) arg);
375 break;
376
377 case JS_SET_ALL:
378 err = copy_from_user(&ds32, argp,
379 sizeof(ds32)) ? -EFAULT : 0;
380 if (err == 0) {
381 joydev->glue.JS_TIMEOUT = ds32.JS_TIMEOUT;
382 joydev->glue.BUSY = ds32.BUSY;
383 joydev->glue.JS_EXPIRETIME = ds32.JS_EXPIRETIME;
384 joydev->glue.JS_TIMELIMIT = ds32.JS_TIMELIMIT;
385 joydev->glue.JS_SAVE = ds32.JS_SAVE;
386 joydev->glue.JS_CORR = ds32.JS_CORR;
387 }
388 break;
389
390 case JS_GET_ALL:
391 ds32.JS_TIMEOUT = joydev->glue.JS_TIMEOUT;
392 ds32.BUSY = joydev->glue.BUSY;
393 ds32.JS_EXPIRETIME = joydev->glue.JS_EXPIRETIME;
394 ds32.JS_TIMELIMIT = joydev->glue.JS_TIMELIMIT;
395 ds32.JS_SAVE = joydev->glue.JS_SAVE;
396 ds32.JS_CORR = joydev->glue.JS_CORR;
397
398 err = copy_to_user(argp, &ds32,
399 sizeof(ds32)) ? -EFAULT : 0;
400 break;
401
402 default:
403 err = joydev_ioctl_common(joydev, cmd, argp);
404 }
405 return err;
406 }
407 #endif /* CONFIG_COMPAT */
408
409 static int joydev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
410 {
411 struct joydev_list *list = file->private_data;
412 struct joydev *joydev = list->joydev;
413 void __user *argp = (void __user *)arg;
414
415 if (!joydev->exist) return -ENODEV;
416
417 switch(cmd) {
418 case JS_SET_TIMELIMIT:
419 return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
420 case JS_GET_TIMELIMIT:
421 return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg);
422 case JS_SET_ALL:
423 return copy_from_user(&joydev->glue, argp,
424 sizeof(joydev->glue)) ? -EFAULT : 0;
425 case JS_GET_ALL:
426 return copy_to_user(argp, &joydev->glue,
427 sizeof(joydev->glue)) ? -EFAULT : 0;
428 default:
429 return joydev_ioctl_common(joydev, cmd, argp);
430 }
431 }
432
433 static struct file_operations joydev_fops = {
434 .owner = THIS_MODULE,
435 .read = joydev_read,
436 .write = joydev_write,
437 .poll = joydev_poll,
438 .open = joydev_open,
439 .release = joydev_release,
440 .ioctl = joydev_ioctl,
441 #ifdef CONFIG_COMPAT
442 .compat_ioctl = joydev_compat_ioctl,
443 #endif
444 .fasync = joydev_fasync,
445 };
446
447 static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
448 {
449 struct joydev *joydev;
450 struct class_device *cdev;
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 = kzalloc(sizeof(struct joydev), GFP_KERNEL)))
460 return NULL;
461
462 INIT_LIST_HEAD(&joydev->list);
463 init_waitqueue_head(&joydev->wait);
464
465 joydev->minor = minor;
466 joydev->exist = 1;
467 joydev->handle.dev = dev;
468 joydev->handle.name = joydev->name;
469 joydev->handle.handler = handler;
470 joydev->handle.private = joydev;
471 sprintf(joydev->name, "js%d", minor);
472
473 for (i = 0; i < ABS_MAX + 1; i++)
474 if (test_bit(i, dev->absbit)) {
475 joydev->absmap[i] = joydev->nabs;
476 joydev->abspam[joydev->nabs] = i;
477 joydev->nabs++;
478 }
479
480 for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++)
481 if (test_bit(i + BTN_MISC, dev->keybit)) {
482 joydev->keymap[i] = joydev->nkey;
483 joydev->keypam[joydev->nkey] = i + BTN_MISC;
484 joydev->nkey++;
485 }
486
487 for (i = 0; i < BTN_JOYSTICK - BTN_MISC; i++)
488 if (test_bit(i + BTN_MISC, dev->keybit)) {
489 joydev->keymap[i] = joydev->nkey;
490 joydev->keypam[joydev->nkey] = i + BTN_MISC;
491 joydev->nkey++;
492 }
493
494 for (i = 0; i < joydev->nabs; i++) {
495 j = joydev->abspam[i];
496 if (dev->absmax[j] == dev->absmin[j]) {
497 joydev->corr[i].type = JS_CORR_NONE;
498 joydev->abs[i] = dev->abs[j];
499 continue;
500 }
501 joydev->corr[i].type = JS_CORR_BROKEN;
502 joydev->corr[i].prec = dev->absfuzz[j];
503 joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j];
504 joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j];
505 if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j])))
506 continue;
507 joydev->corr[i].coef[2] = (1 << 29) / t;
508 joydev->corr[i].coef[3] = (1 << 29) / t;
509
510 joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i);
511 }
512
513 joydev_table[minor] = joydev;
514
515 cdev = class_device_create(&input_class, &dev->cdev,
516 MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor),
517 dev->cdev.dev, joydev->name);
518
519 /* temporary symlink to keep userspace happy */
520 sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj,
521 joydev->name);
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 sysfs_remove_link(&input_class.subsys.kset.kobj, joydev->name);
532 class_device_destroy(&input_class, MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + 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);
598
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