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MOXA linux-2.6.x / linux-2.6.9-uc0 from sdlinux-moxaart.tgz
[linux-2.6.9-moxart.git] / drivers / input / evdev.c
blob3737e5abc286cb6e6d1d3b0ace9d327ae0aa1398
1 /*
2 * Event char devices, giving access to raw input device events.
3 *
4 * Copyright (c) 1999-2002 Vojtech Pavlik
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 */
10
11 #define EVDEV_MINOR_BASE 64
12 #define EVDEV_MINORS 32
13 #define EVDEV_BUFFER_SIZE 64
14
15 #include <linux/poll.h>
16 #include <linux/slab.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/input.h>
20 #include <linux/major.h>
21 #include <linux/smp_lock.h>
22 #include <linux/device.h>
23 #include <linux/devfs_fs_kernel.h>
24
25 struct evdev {
26 int exist;
27 int open;
28 int minor;
29 char name[16];
30 struct input_handle handle;
31 wait_queue_head_t wait;
32 struct evdev_list *grab;
33 struct list_head list;
34 };
35
36 struct evdev_list {
37 struct input_event buffer[EVDEV_BUFFER_SIZE];
38 int head;
39 int tail;
40 struct fasync_struct *fasync;
41 struct evdev *evdev;
42 struct list_head node;
43 };
44
45 static struct evdev *evdev_table[EVDEV_MINORS];
46
47 static void evdev_event(struct input_handle *handle, unsigned int type, unsigned int code, int value)
48 {
49 struct evdev *evdev = handle->private;
50 struct evdev_list *list;
51
52 if (evdev->grab) {
53 list = evdev->grab;
54
55 do_gettimeofday(&list->buffer[list->head].time);
56 list->buffer[list->head].type = type;
57 list->buffer[list->head].code = code;
58 list->buffer[list->head].value = value;
59 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
60
61 kill_fasync(&list->fasync, SIGIO, POLL_IN);
62 } else
63 list_for_each_entry(list, &evdev->list, node) {
64
65 do_gettimeofday(&list->buffer[list->head].time);
66 list->buffer[list->head].type = type;
67 list->buffer[list->head].code = code;
68 list->buffer[list->head].value = value;
69 list->head = (list->head + 1) & (EVDEV_BUFFER_SIZE - 1);
70
71 kill_fasync(&list->fasync, SIGIO, POLL_IN);
72 }
73
74 wake_up_interruptible(&evdev->wait);
75 }
76
77 static int evdev_fasync(int fd, struct file *file, int on)
78 {
79 int retval;
80 struct evdev_list *list = file->private_data;
81 retval = fasync_helper(fd, file, on, &list->fasync);
82 return retval < 0 ? retval : 0;
83 }
84
85 static int evdev_flush(struct file * file)
86 {
87 struct evdev_list *list = file->private_data;
88 if (!list->evdev->exist) return -ENODEV;
89 return input_flush_device(&list->evdev->handle, file);
90 }
91
92 static void evdev_free(struct evdev *evdev)
93 {
94 devfs_remove("input/event%d", evdev->minor);
95 class_simple_device_remove(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor));
96 evdev_table[evdev->minor] = NULL;
97 kfree(evdev);
98 }
99
100 static int evdev_release(struct inode * inode, struct file * file)
101 {
102 struct evdev_list *list = file->private_data;
103
104 if (list->evdev->grab == list) {
105 input_release_device(&list->evdev->handle);
106 list->evdev->grab = NULL;
107 }
108
109 evdev_fasync(-1, file, 0);
110 list_del(&list->node);
111
112 if (!--list->evdev->open) {
113 if (list->evdev->exist)
114 input_close_device(&list->evdev->handle);
115 else
116 evdev_free(list->evdev);
117 }
118
119 kfree(list);
120 return 0;
121 }
122
123 static int evdev_open(struct inode * inode, struct file * file)
124 {
125 struct evdev_list *list;
126 int i = iminor(inode) - EVDEV_MINOR_BASE;
127 int accept_err;
128
129 if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist)
130 return -ENODEV;
131
132 if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file)))
133 return accept_err;
134
135 if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL)))
136 return -ENOMEM;
137 memset(list, 0, sizeof(struct evdev_list));
138
139 list->evdev = evdev_table[i];
140 list_add_tail(&list->node, &evdev_table[i]->list);
141 file->private_data = list;
142
143 if (!list->evdev->open++)
144 if (list->evdev->exist)
145 input_open_device(&list->evdev->handle);
146
147 return 0;
148 }
149
150 static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos)
151 {
152 struct evdev_list *list = file->private_data;
153 struct input_event event;
154 int retval = 0;
155
156 if (!list->evdev->exist) return -ENODEV;
157
158 while (retval < count) {
159
160 if (copy_from_user(&event, buffer + retval, sizeof(struct input_event)))
161 return -EFAULT;
162 input_event(list->evdev->handle.dev, event.type, event.code, event.value);
163 retval += sizeof(struct input_event);
164 }
165
166 return retval;
167 }
168
169 static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos)
170 {
171 struct evdev_list *list = file->private_data;
172 int retval;
173
174 if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK))
175 return -EAGAIN;
176
177 retval = wait_event_interruptible(list->evdev->wait,
178 list->head != list->tail || (!list->evdev->exist));
179
180 if (retval)
181 return retval;
182
183 if (!list->evdev->exist)
184 return -ENODEV;
185
186 while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
187 if (copy_to_user(buffer + retval, list->buffer + list->tail,
188 sizeof(struct input_event))) return -EFAULT;
189 list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1);
190 retval += sizeof(struct input_event);
191 }
192
193 return retval;
194 }
195
196 /* No kernel lock - fine */
197 static unsigned int evdev_poll(struct file *file, poll_table *wait)
198 {
199 struct evdev_list *list = file->private_data;
200 poll_wait(file, &list->evdev->wait, wait);
201 if (list->head != list->tail)
202 return POLLIN | POLLRDNORM;
203 return 0;
204 }
205
206 static int evdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
207 {
208 struct evdev_list *list = file->private_data;
209 struct evdev *evdev = list->evdev;
210 struct input_dev *dev = evdev->handle.dev;
211 struct input_absinfo abs;
212 void __user *p = (void __user *)arg;
213 int __user *ip = (int __user *)arg;
214 int i, t, u, v;
215
216 if (!evdev->exist) return -ENODEV;
217
218 switch (cmd) {
219
220 case EVIOCGVERSION:
221 return put_user(EV_VERSION, ip);
222
223 case EVIOCGID:
224 return copy_to_user(p, &dev->id, sizeof(struct input_id)) ? -EFAULT : 0;
225
226 case EVIOCGKEYCODE:
227 if (get_user(t, ip)) return -EFAULT;
228 if (t < 0 || t > dev->keycodemax || !dev->keycodesize) return -EINVAL;
229 if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) return -EFAULT;
230 return 0;
231
232 case EVIOCSKEYCODE:
233 if (get_user(t, ip)) return -EFAULT;
234 if (t < 0 || t > dev->keycodemax || !dev->keycodesize) return -EINVAL;
235 if (get_user(v, ip + 1)) return -EFAULT;
236 u = SET_INPUT_KEYCODE(dev, t, v);
237 clear_bit(u, dev->keybit);
238 set_bit(v, dev->keybit);
239 for (i = 0; i < dev->keycodemax; i++)
240 if (INPUT_KEYCODE(dev,i) == u)
241 set_bit(u, dev->keybit);
242 return 0;
243
244 case EVIOCSFF:
245 if (dev->upload_effect) {
246 struct ff_effect effect;
247 int err;
248
249 if (copy_from_user(&effect, p, sizeof(effect)))
250 return -EFAULT;
251 err = dev->upload_effect(dev, &effect);
252 if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id)))
253 return -EFAULT;
254 return err;
255 }
256 else return -ENOSYS;
257
258 case EVIOCRMFF:
259 if (dev->erase_effect) {
260 return dev->erase_effect(dev, (int)arg);
261 }
262 else return -ENOSYS;
263
264 case EVIOCGEFFECTS:
265 if (put_user(dev->ff_effects_max, ip))
266 return -EFAULT;
267 return 0;
268
269 case EVIOCGRAB:
270 if (arg) {
271 if (evdev->grab)
272 return -EBUSY;
273 if (input_grab_device(&evdev->handle))
274 return -EBUSY;
275 evdev->grab = list;
276 return 0;
277 } else {
278 if (evdev->grab != list)
279 return -EINVAL;
280 input_release_device(&evdev->handle);
281 evdev->grab = NULL;
282 return 0;
283 }
284
285 default:
286
287 if (_IOC_TYPE(cmd) != 'E' || _IOC_DIR(cmd) != _IOC_READ)
288 return -EINVAL;
289
290 if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) {
291
292 long *bits;
293 int len;
294
295 switch (_IOC_NR(cmd) & EV_MAX) {
296 case 0: bits = dev->evbit; len = EV_MAX; break;
297 case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
298 case EV_REL: bits = dev->relbit; len = REL_MAX; break;
299 case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
300 case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
301 case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
302 case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
303 case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
304 default: return -EINVAL;
305 }
306 len = NBITS(len) * sizeof(long);
307 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
308 return copy_to_user(p, bits, len) ? -EFAULT : len;
309 }
310
311 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) {
312 int len;
313 len = NBITS(KEY_MAX) * sizeof(long);
314 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
315 return copy_to_user(p, dev->key, len) ? -EFAULT : len;
316 }
317
318 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) {
319 int len;
320 len = NBITS(LED_MAX) * sizeof(long);
321 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
322 return copy_to_user(p, dev->led, len) ? -EFAULT : len;
323 }
324
325 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) {
326 int len;
327 len = NBITS(SND_MAX) * sizeof(long);
328 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
329 return copy_to_user(p, dev->snd, len) ? -EFAULT : len;
330 }
331
332 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) {
333 int len;
334 if (!dev->name) return -ENOENT;
335 len = strlen(dev->name) + 1;
336 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
337 return copy_to_user(p, dev->name, len) ? -EFAULT : len;
338 }
339
340 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) {
341 int len;
342 if (!dev->phys) return -ENOENT;
343 len = strlen(dev->phys) + 1;
344 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
345 return copy_to_user(p, dev->phys, len) ? -EFAULT : len;
346 }
347
348 if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) {
349 int len;
350 if (!dev->uniq) return -ENOENT;
351 len = strlen(dev->uniq) + 1;
352 if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd);
353 return copy_to_user(p, dev->uniq, len) ? -EFAULT : len;
354 }
355
356 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
357
358 int t = _IOC_NR(cmd) & ABS_MAX;
359
360 abs.value = dev->abs[t];
361 abs.minimum = dev->absmin[t];
362 abs.maximum = dev->absmax[t];
363 abs.fuzz = dev->absfuzz[t];
364 abs.flat = dev->absflat[t];
365
366 if (copy_to_user(p, &abs, sizeof(struct input_absinfo)))
367 return -EFAULT;
368
369 return 0;
370 }
371
372 if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
373
374 int t = _IOC_NR(cmd) & ABS_MAX;
375
376 if (copy_from_user(&abs, p, sizeof(struct input_absinfo)))
377 return -EFAULT;
378
379 dev->abs[t] = abs.value;
380 dev->absmin[t] = abs.minimum;
381 dev->absmax[t] = abs.maximum;
382 dev->absfuzz[t] = abs.fuzz;
383 dev->absflat[t] = abs.flat;
384
385 return 0;
386 }
387 }
388 return -EINVAL;
389 }
390
391 static struct file_operations evdev_fops = {
392 .owner = THIS_MODULE,
393 .read = evdev_read,
394 .write = evdev_write,
395 .poll = evdev_poll,
396 .open = evdev_open,
397 .release = evdev_release,
398 .ioctl = evdev_ioctl,
399 .fasync = evdev_fasync,
400 .flush = evdev_flush
401 };
402
403 static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id)
404 {
405 struct evdev *evdev;
406 int minor;
407
408 for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++);
409 if (minor == EVDEV_MINORS) {
410 printk(KERN_ERR "evdev: no more free evdev devices\n");
411 return NULL;
412 }
413
414 if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL)))
415 return NULL;
416 memset(evdev, 0, sizeof(struct evdev));
417
418 INIT_LIST_HEAD(&evdev->list);
419 init_waitqueue_head(&evdev->wait);
420
421 evdev->exist = 1;
422 evdev->minor = minor;
423 evdev->handle.dev = dev;
424 evdev->handle.name = evdev->name;
425 evdev->handle.handler = handler;
426 evdev->handle.private = evdev;
427 sprintf(evdev->name, "event%d", minor);
428
429 evdev_table[minor] = evdev;
430
431 devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
432 S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor);
433 class_simple_device_add(input_class,
434 MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor),
435 dev->dev, "event%d", minor);
436
437 return &evdev->handle;
438 }
439
440 static void evdev_disconnect(struct input_handle *handle)
441 {
442 struct evdev *evdev = handle->private;
443
444 evdev->exist = 0;
445
446 if (evdev->open) {
447 input_close_device(handle);
448 wake_up_interruptible(&evdev->wait);
449 } else
450 evdev_free(evdev);
451 }
452
453 static struct input_device_id evdev_ids[] = {
454 { .driver_info = 1 }, /* Matches all devices */
455 { }, /* Terminating zero entry */
456 };
457
458 MODULE_DEVICE_TABLE(input, evdev_ids);
459
460 static struct input_handler evdev_handler = {
461 .event = evdev_event,
462 .connect = evdev_connect,
463 .disconnect = evdev_disconnect,
464 .fops = &evdev_fops,
465 .minor = EVDEV_MINOR_BASE,
466 .name = "evdev",
467 .id_table = evdev_ids,
468 };
469
470 static int __init evdev_init(void)
471 {
472 input_register_handler(&evdev_handler);
473 return 0;
474 }
475
476 static void __exit evdev_exit(void)
477 {
478 input_unregister_handler(&evdev_handler);
479 }
480
481 module_init(evdev_init);
482 module_exit(evdev_exit);
483
484 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
485 MODULE_DESCRIPTION("Input driver event char devices");
486 MODULE_LICENSE("GPL");
MOXA 2.6.9 from sdlinux-moxaart.tgz