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[XFRM]: skb_cow_data() does not set proper owner for new skbs.
[linux-2.6/verdex.git] / drivers / input / joydev.c
blob7d7527f8b02dc6f832cfcde761138bbd17b9d0c8
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);
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