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1da177e4 LT |
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(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) | |
289 | { | |
290 | struct joydev_list *list = file->private_data; | |
291 | struct joydev *joydev = list->joydev; | |
292 | struct input_dev *dev = joydev->handle.dev; | |
293 | void __user *argp = (void __user *)arg; | |
294 | int i, j; | |
295 | ||
296 | if (!joydev->exist) return -ENODEV; | |
297 | ||
298 | switch (cmd) { | |
299 | ||
300 | case JS_SET_CAL: | |
301 | return copy_from_user(&joydev->glue.JS_CORR, argp, | |
302 | sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0; | |
303 | case JS_GET_CAL: | |
304 | return copy_to_user(argp, &joydev->glue.JS_CORR, | |
305 | sizeof(struct JS_DATA_TYPE)) ? -EFAULT : 0; | |
306 | case JS_SET_TIMEOUT: | |
307 | return get_user(joydev->glue.JS_TIMEOUT, (int __user *) arg); | |
308 | case JS_GET_TIMEOUT: | |
309 | return put_user(joydev->glue.JS_TIMEOUT, (int __user *) arg); | |
310 | case JS_SET_TIMELIMIT: | |
311 | return get_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); | |
312 | case JS_GET_TIMELIMIT: | |
313 | return put_user(joydev->glue.JS_TIMELIMIT, (long __user *) arg); | |
314 | case JS_SET_ALL: | |
315 | return copy_from_user(&joydev->glue, argp, | |
316 | sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0; | |
317 | case JS_GET_ALL: | |
318 | return copy_to_user(argp, &joydev->glue, | |
319 | sizeof(struct JS_DATA_SAVE_TYPE)) ? -EFAULT : 0; | |
320 | ||
321 | case JSIOCGVERSION: | |
322 | return put_user(JS_VERSION, (__u32 __user *) arg); | |
323 | case JSIOCGAXES: | |
324 | return put_user(joydev->nabs, (__u8 __user *) arg); | |
325 | case JSIOCGBUTTONS: | |
326 | return put_user(joydev->nkey, (__u8 __user *) arg); | |
327 | case JSIOCSCORR: | |
328 | if (copy_from_user(joydev->corr, argp, | |
329 | sizeof(struct js_corr) * joydev->nabs)) | |
330 | return -EFAULT; | |
331 | for (i = 0; i < joydev->nabs; i++) { | |
332 | j = joydev->abspam[i]; | |
333 | joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i); | |
334 | } | |
335 | return 0; | |
336 | case JSIOCGCORR: | |
337 | return copy_to_user(argp, joydev->corr, | |
338 | sizeof(struct js_corr) * joydev->nabs) ? -EFAULT : 0; | |
339 | case JSIOCSAXMAP: | |
340 | if (copy_from_user(joydev->abspam, argp, sizeof(__u8) * (ABS_MAX + 1))) | |
341 | return -EFAULT; | |
342 | for (i = 0; i < joydev->nabs; i++) { | |
343 | if (joydev->abspam[i] > ABS_MAX) return -EINVAL; | |
344 | joydev->absmap[joydev->abspam[i]] = i; | |
345 | } | |
346 | return 0; | |
347 | case JSIOCGAXMAP: | |
348 | return copy_to_user(argp, joydev->abspam, | |
349 | sizeof(__u8) * (ABS_MAX + 1)) ? -EFAULT : 0; | |
350 | case JSIOCSBTNMAP: | |
351 | if (copy_from_user(joydev->keypam, argp, sizeof(__u16) * (KEY_MAX - BTN_MISC + 1))) | |
352 | return -EFAULT; | |
353 | for (i = 0; i < joydev->nkey; i++) { | |
354 | if (joydev->keypam[i] > KEY_MAX || joydev->keypam[i] < BTN_MISC) return -EINVAL; | |
355 | joydev->keymap[joydev->keypam[i] - BTN_MISC] = i; | |
356 | } | |
357 | return 0; | |
358 | case JSIOCGBTNMAP: | |
359 | return copy_to_user(argp, joydev->keypam, | |
360 | sizeof(__u16) * (KEY_MAX - BTN_MISC + 1)) ? -EFAULT : 0; | |
361 | default: | |
362 | if ((cmd & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT)) == JSIOCGNAME(0)) { | |
363 | int len; | |
364 | if (!dev->name) return 0; | |
365 | len = strlen(dev->name) + 1; | |
366 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); | |
367 | if (copy_to_user(argp, dev->name, len)) return -EFAULT; | |
368 | return len; | |
369 | } | |
370 | } | |
371 | return -EINVAL; | |
372 | } | |
373 | ||
374 | static struct file_operations joydev_fops = { | |
375 | .owner = THIS_MODULE, | |
376 | .read = joydev_read, | |
377 | .write = joydev_write, | |
378 | .poll = joydev_poll, | |
379 | .open = joydev_open, | |
380 | .release = joydev_release, | |
381 | .ioctl = joydev_ioctl, | |
382 | .fasync = joydev_fasync, | |
383 | }; | |
384 | ||
385 | static struct input_handle *joydev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) | |
386 | { | |
387 | struct joydev *joydev; | |
388 | int i, j, t, minor; | |
389 | ||
390 | for (minor = 0; minor < JOYDEV_MINORS && joydev_table[minor]; minor++); | |
391 | if (minor == JOYDEV_MINORS) { | |
392 | printk(KERN_ERR "joydev: no more free joydev devices\n"); | |
393 | return NULL; | |
394 | } | |
395 | ||
396 | if (!(joydev = kmalloc(sizeof(struct joydev), GFP_KERNEL))) | |
397 | return NULL; | |
398 | memset(joydev, 0, sizeof(struct joydev)); | |
399 | ||
400 | INIT_LIST_HEAD(&joydev->list); | |
401 | init_waitqueue_head(&joydev->wait); | |
402 | ||
403 | joydev->minor = minor; | |
404 | joydev->exist = 1; | |
405 | joydev->handle.dev = dev; | |
406 | joydev->handle.name = joydev->name; | |
407 | joydev->handle.handler = handler; | |
408 | joydev->handle.private = joydev; | |
409 | sprintf(joydev->name, "js%d", minor); | |
410 | ||
411 | for (i = 0; i < ABS_MAX + 1; i++) | |
412 | if (test_bit(i, dev->absbit)) { | |
413 | joydev->absmap[i] = joydev->nabs; | |
414 | joydev->abspam[joydev->nabs] = i; | |
415 | joydev->nabs++; | |
416 | } | |
417 | ||
418 | for (i = BTN_JOYSTICK - BTN_MISC; i < KEY_MAX - BTN_MISC + 1; i++) | |
419 | if (test_bit(i + BTN_MISC, dev->keybit)) { | |
420 | joydev->keymap[i] = joydev->nkey; | |
421 | joydev->keypam[joydev->nkey] = i + BTN_MISC; | |
422 | joydev->nkey++; | |
423 | } | |
424 | ||
425 | for (i = 0; i < BTN_JOYSTICK - BTN_MISC + 1; i++) | |
426 | if (test_bit(i + BTN_MISC, dev->keybit)) { | |
427 | joydev->keymap[i] = joydev->nkey; | |
428 | joydev->keypam[joydev->nkey] = i + BTN_MISC; | |
429 | joydev->nkey++; | |
430 | } | |
431 | ||
432 | for (i = 0; i < joydev->nabs; i++) { | |
433 | j = joydev->abspam[i]; | |
434 | if (dev->absmax[j] == dev->absmin[j]) { | |
435 | joydev->corr[i].type = JS_CORR_NONE; | |
436 | joydev->abs[i] = dev->abs[j]; | |
437 | continue; | |
438 | } | |
439 | joydev->corr[i].type = JS_CORR_BROKEN; | |
440 | joydev->corr[i].prec = dev->absfuzz[j]; | |
441 | joydev->corr[i].coef[0] = (dev->absmax[j] + dev->absmin[j]) / 2 - dev->absflat[j]; | |
442 | joydev->corr[i].coef[1] = (dev->absmax[j] + dev->absmin[j]) / 2 + dev->absflat[j]; | |
443 | if (!(t = ((dev->absmax[j] - dev->absmin[j]) / 2 - 2 * dev->absflat[j]))) | |
444 | continue; | |
445 | joydev->corr[i].coef[2] = (1 << 29) / t; | |
446 | joydev->corr[i].coef[3] = (1 << 29) / t; | |
447 | ||
448 | joydev->abs[i] = joydev_correct(dev->abs[j], joydev->corr + i); | |
449 | } | |
450 | ||
451 | joydev_table[minor] = joydev; | |
452 | ||
453 | devfs_mk_cdev(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor), | |
454 | S_IFCHR|S_IRUGO|S_IWUSR, "input/js%d", minor); | |
455 | class_simple_device_add(input_class, | |
456 | MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + minor), | |
457 | dev->dev, "js%d", minor); | |
458 | ||
459 | return &joydev->handle; | |
460 | } | |
461 | ||
462 | static void joydev_disconnect(struct input_handle *handle) | |
463 | { | |
464 | struct joydev *joydev = handle->private; | |
465 | struct joydev_list *list; | |
466 | ||
467 | class_simple_device_remove(MKDEV(INPUT_MAJOR, JOYDEV_MINOR_BASE + joydev->minor)); | |
468 | devfs_remove("input/js%d", joydev->minor); | |
469 | joydev->exist = 0; | |
470 | ||
471 | if (joydev->open) { | |
472 | input_close_device(handle); | |
473 | wake_up_interruptible(&joydev->wait); | |
474 | list_for_each_entry(list, &joydev->list, node) | |
475 | kill_fasync(&list->fasync, SIGIO, POLL_HUP); | |
476 | } else | |
477 | joydev_free(joydev); | |
478 | } | |
479 | ||
480 | static struct input_device_id joydev_blacklist[] = { | |
481 | { | |
482 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_KEYBIT, | |
483 | .evbit = { BIT(EV_KEY) }, | |
484 | .keybit = { [LONG(BTN_TOUCH)] = BIT(BTN_TOUCH) }, | |
485 | }, /* Avoid itouchpads, touchscreens and tablets */ | |
486 | { }, /* Terminating entry */ | |
487 | }; | |
488 | ||
489 | static struct input_device_id joydev_ids[] = { | |
490 | { | |
491 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
492 | .evbit = { BIT(EV_ABS) }, | |
493 | .absbit = { BIT(ABS_X) }, | |
494 | }, | |
495 | { | |
496 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
497 | .evbit = { BIT(EV_ABS) }, | |
498 | .absbit = { BIT(ABS_WHEEL) }, | |
499 | }, | |
500 | { | |
501 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
502 | .evbit = { BIT(EV_ABS) }, | |
503 | .absbit = { BIT(ABS_THROTTLE) }, | |
504 | }, | |
505 | { }, /* Terminating entry */ | |
506 | }; | |
507 | ||
508 | MODULE_DEVICE_TABLE(input, joydev_ids); | |
509 | ||
510 | static struct input_handler joydev_handler = { | |
511 | .event = joydev_event, | |
512 | .connect = joydev_connect, | |
513 | .disconnect = joydev_disconnect, | |
514 | .fops = &joydev_fops, | |
515 | .minor = JOYDEV_MINOR_BASE, | |
516 | .name = "joydev", | |
517 | .id_table = joydev_ids, | |
518 | .blacklist = joydev_blacklist, | |
519 | }; | |
520 | ||
521 | static int __init joydev_init(void) | |
522 | { | |
523 | input_register_handler(&joydev_handler); | |
524 | return 0; | |
525 | } | |
526 | ||
527 | static void __exit joydev_exit(void) | |
528 | { | |
529 | input_unregister_handler(&joydev_handler); | |
530 | } | |
531 | ||
532 | module_init(joydev_init); | |
533 | module_exit(joydev_exit); |