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Commit | Line | Data |
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1da177e4 LT |
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 | evdev_table[evdev->minor] = NULL; | |
95 | kfree(evdev); | |
96 | } | |
97 | ||
98 | static int evdev_release(struct inode * inode, struct file * file) | |
99 | { | |
100 | struct evdev_list *list = file->private_data; | |
101 | ||
102 | if (list->evdev->grab == list) { | |
103 | input_release_device(&list->evdev->handle); | |
104 | list->evdev->grab = NULL; | |
105 | } | |
106 | ||
107 | evdev_fasync(-1, file, 0); | |
108 | list_del(&list->node); | |
109 | ||
110 | if (!--list->evdev->open) { | |
111 | if (list->evdev->exist) | |
112 | input_close_device(&list->evdev->handle); | |
113 | else | |
114 | evdev_free(list->evdev); | |
115 | } | |
116 | ||
117 | kfree(list); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | static int evdev_open(struct inode * inode, struct file * file) | |
122 | { | |
123 | struct evdev_list *list; | |
124 | int i = iminor(inode) - EVDEV_MINOR_BASE; | |
125 | int accept_err; | |
126 | ||
127 | if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist) | |
128 | return -ENODEV; | |
129 | ||
130 | if ((accept_err = input_accept_process(&(evdev_table[i]->handle), file))) | |
131 | return accept_err; | |
132 | ||
133 | if (!(list = kmalloc(sizeof(struct evdev_list), GFP_KERNEL))) | |
134 | return -ENOMEM; | |
135 | memset(list, 0, sizeof(struct evdev_list)); | |
136 | ||
137 | list->evdev = evdev_table[i]; | |
138 | list_add_tail(&list->node, &evdev_table[i]->list); | |
139 | file->private_data = list; | |
140 | ||
141 | if (!list->evdev->open++) | |
142 | if (list->evdev->exist) | |
143 | input_open_device(&list->evdev->handle); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
149 | { | |
150 | struct evdev_list *list = file->private_data; | |
151 | struct input_event event; | |
152 | int retval = 0; | |
153 | ||
154 | if (!list->evdev->exist) return -ENODEV; | |
155 | ||
156 | while (retval < count) { | |
157 | ||
158 | if (copy_from_user(&event, buffer + retval, sizeof(struct input_event))) | |
159 | return -EFAULT; | |
160 | input_event(list->evdev->handle.dev, event.type, event.code, event.value); | |
161 | retval += sizeof(struct input_event); | |
162 | } | |
163 | ||
164 | return retval; | |
165 | } | |
166 | ||
167 | static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) | |
168 | { | |
169 | struct evdev_list *list = file->private_data; | |
170 | int retval; | |
171 | ||
172 | if (count < sizeof(struct input_event)) | |
173 | return -EINVAL; | |
174 | ||
175 | if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) | |
176 | return -EAGAIN; | |
177 | ||
178 | retval = wait_event_interruptible(list->evdev->wait, | |
179 | list->head != list->tail || (!list->evdev->exist)); | |
180 | ||
181 | if (retval) | |
182 | return retval; | |
183 | ||
184 | if (!list->evdev->exist) | |
185 | return -ENODEV; | |
186 | ||
187 | while (list->head != list->tail && retval + sizeof(struct input_event) <= count) { | |
188 | if (copy_to_user(buffer + retval, list->buffer + list->tail, | |
189 | sizeof(struct input_event))) return -EFAULT; | |
190 | list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); | |
191 | retval += sizeof(struct input_event); | |
192 | } | |
193 | ||
194 | return retval; | |
195 | } | |
196 | ||
197 | /* No kernel lock - fine */ | |
198 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
199 | { | |
200 | struct evdev_list *list = file->private_data; | |
201 | poll_wait(file, &list->evdev->wait, wait); | |
202 | return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) | | |
203 | (list->evdev->exist ? 0 : (POLLHUP | POLLERR)); | |
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 | if (v < 0 || v > KEY_MAX) return -EINVAL; | |
237 | u = SET_INPUT_KEYCODE(dev, t, v); | |
238 | clear_bit(u, dev->keybit); | |
239 | set_bit(v, dev->keybit); | |
240 | for (i = 0; i < dev->keycodemax; i++) | |
241 | if (INPUT_KEYCODE(dev,i) == u) | |
242 | set_bit(u, dev->keybit); | |
243 | return 0; | |
244 | ||
245 | case EVIOCSFF: | |
246 | if (dev->upload_effect) { | |
247 | struct ff_effect effect; | |
248 | int err; | |
249 | ||
250 | if (copy_from_user(&effect, p, sizeof(effect))) | |
251 | return -EFAULT; | |
252 | err = dev->upload_effect(dev, &effect); | |
253 | if (put_user(effect.id, &(((struct ff_effect __user *)arg)->id))) | |
254 | return -EFAULT; | |
255 | return err; | |
256 | } | |
257 | else return -ENOSYS; | |
258 | ||
259 | case EVIOCRMFF: | |
260 | if (dev->erase_effect) { | |
261 | return dev->erase_effect(dev, (int)arg); | |
262 | } | |
263 | else return -ENOSYS; | |
264 | ||
265 | case EVIOCGEFFECTS: | |
266 | if (put_user(dev->ff_effects_max, ip)) | |
267 | return -EFAULT; | |
268 | return 0; | |
269 | ||
270 | case EVIOCGRAB: | |
271 | if (arg) { | |
272 | if (evdev->grab) | |
273 | return -EBUSY; | |
274 | if (input_grab_device(&evdev->handle)) | |
275 | return -EBUSY; | |
276 | evdev->grab = list; | |
277 | return 0; | |
278 | } else { | |
279 | if (evdev->grab != list) | |
280 | return -EINVAL; | |
281 | input_release_device(&evdev->handle); | |
282 | evdev->grab = NULL; | |
283 | return 0; | |
284 | } | |
285 | ||
286 | default: | |
287 | ||
288 | if (_IOC_TYPE(cmd) != 'E' || _IOC_DIR(cmd) != _IOC_READ) | |
289 | return -EINVAL; | |
290 | ||
291 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { | |
292 | ||
293 | long *bits; | |
294 | int len; | |
295 | ||
296 | switch (_IOC_NR(cmd) & EV_MAX) { | |
297 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
298 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
299 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
300 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
301 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
302 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
303 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
304 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
305 | default: return -EINVAL; | |
306 | } | |
307 | len = NBITS(len) * sizeof(long); | |
308 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); | |
309 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
310 | } | |
311 | ||
312 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) { | |
313 | int len; | |
314 | len = NBITS(KEY_MAX) * sizeof(long); | |
315 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); | |
316 | return copy_to_user(p, dev->key, len) ? -EFAULT : len; | |
317 | } | |
318 | ||
319 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) { | |
320 | int len; | |
321 | len = NBITS(LED_MAX) * sizeof(long); | |
322 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); | |
323 | return copy_to_user(p, dev->led, len) ? -EFAULT : len; | |
324 | } | |
325 | ||
326 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) { | |
327 | int len; | |
328 | len = NBITS(SND_MAX) * sizeof(long); | |
329 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); | |
330 | return copy_to_user(p, dev->snd, len) ? -EFAULT : len; | |
331 | } | |
332 | ||
333 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) { | |
334 | int len; | |
335 | if (!dev->name) return -ENOENT; | |
336 | len = strlen(dev->name) + 1; | |
337 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); | |
338 | return copy_to_user(p, dev->name, len) ? -EFAULT : len; | |
339 | } | |
340 | ||
341 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) { | |
342 | int len; | |
343 | if (!dev->phys) return -ENOENT; | |
344 | len = strlen(dev->phys) + 1; | |
345 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); | |
346 | return copy_to_user(p, dev->phys, len) ? -EFAULT : len; | |
347 | } | |
348 | ||
349 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) { | |
350 | int len; | |
351 | if (!dev->uniq) return -ENOENT; | |
352 | len = strlen(dev->uniq) + 1; | |
353 | if (len > _IOC_SIZE(cmd)) len = _IOC_SIZE(cmd); | |
354 | return copy_to_user(p, dev->uniq, len) ? -EFAULT : len; | |
355 | } | |
356 | ||
357 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { | |
358 | ||
359 | int t = _IOC_NR(cmd) & ABS_MAX; | |
360 | ||
361 | abs.value = dev->abs[t]; | |
362 | abs.minimum = dev->absmin[t]; | |
363 | abs.maximum = dev->absmax[t]; | |
364 | abs.fuzz = dev->absfuzz[t]; | |
365 | abs.flat = dev->absflat[t]; | |
366 | ||
367 | if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) | |
368 | return -EFAULT; | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { | |
374 | ||
375 | int t = _IOC_NR(cmd) & ABS_MAX; | |
376 | ||
377 | if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) | |
378 | return -EFAULT; | |
379 | ||
380 | dev->abs[t] = abs.value; | |
381 | dev->absmin[t] = abs.minimum; | |
382 | dev->absmax[t] = abs.maximum; | |
383 | dev->absfuzz[t] = abs.fuzz; | |
384 | dev->absflat[t] = abs.flat; | |
385 | ||
386 | return 0; | |
387 | } | |
388 | } | |
389 | return -EINVAL; | |
390 | } | |
391 | ||
392 | static struct file_operations evdev_fops = { | |
393 | .owner = THIS_MODULE, | |
394 | .read = evdev_read, | |
395 | .write = evdev_write, | |
396 | .poll = evdev_poll, | |
397 | .open = evdev_open, | |
398 | .release = evdev_release, | |
399 | .ioctl = evdev_ioctl, | |
400 | .fasync = evdev_fasync, | |
401 | .flush = evdev_flush | |
402 | }; | |
403 | ||
404 | static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) | |
405 | { | |
406 | struct evdev *evdev; | |
407 | int minor; | |
408 | ||
409 | for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++); | |
410 | if (minor == EVDEV_MINORS) { | |
411 | printk(KERN_ERR "evdev: no more free evdev devices\n"); | |
412 | return NULL; | |
413 | } | |
414 | ||
415 | if (!(evdev = kmalloc(sizeof(struct evdev), GFP_KERNEL))) | |
416 | return NULL; | |
417 | memset(evdev, 0, sizeof(struct evdev)); | |
418 | ||
419 | INIT_LIST_HEAD(&evdev->list); | |
420 | init_waitqueue_head(&evdev->wait); | |
421 | ||
422 | evdev->exist = 1; | |
423 | evdev->minor = minor; | |
424 | evdev->handle.dev = dev; | |
425 | evdev->handle.name = evdev->name; | |
426 | evdev->handle.handler = handler; | |
427 | evdev->handle.private = evdev; | |
428 | sprintf(evdev->name, "event%d", minor); | |
429 | ||
430 | evdev_table[minor] = evdev; | |
431 | ||
432 | devfs_mk_cdev(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), | |
433 | S_IFCHR|S_IRUGO|S_IWUSR, "input/event%d", minor); | |
434 | class_simple_device_add(input_class, | |
435 | MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), | |
436 | dev->dev, "event%d", minor); | |
437 | ||
438 | return &evdev->handle; | |
439 | } | |
440 | ||
441 | static void evdev_disconnect(struct input_handle *handle) | |
442 | { | |
443 | struct evdev *evdev = handle->private; | |
444 | struct evdev_list *list; | |
445 | ||
446 | class_simple_device_remove(MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor)); | |
447 | devfs_remove("input/event%d", evdev->minor); | |
448 | evdev->exist = 0; | |
449 | ||
450 | if (evdev->open) { | |
451 | input_close_device(handle); | |
452 | wake_up_interruptible(&evdev->wait); | |
453 | list_for_each_entry(list, &evdev->list, node) | |
454 | kill_fasync(&list->fasync, SIGIO, POLL_HUP); | |
455 | } else | |
456 | evdev_free(evdev); | |
457 | } | |
458 | ||
459 | static struct input_device_id evdev_ids[] = { | |
460 | { .driver_info = 1 }, /* Matches all devices */ | |
461 | { }, /* Terminating zero entry */ | |
462 | }; | |
463 | ||
464 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
465 | ||
466 | static struct input_handler evdev_handler = { | |
467 | .event = evdev_event, | |
468 | .connect = evdev_connect, | |
469 | .disconnect = evdev_disconnect, | |
470 | .fops = &evdev_fops, | |
471 | .minor = EVDEV_MINOR_BASE, | |
472 | .name = "evdev", | |
473 | .id_table = evdev_ids, | |
474 | }; | |
475 | ||
476 | static int __init evdev_init(void) | |
477 | { | |
478 | input_register_handler(&evdev_handler); | |
479 | return 0; | |
480 | } | |
481 | ||
482 | static void __exit evdev_exit(void) | |
483 | { | |
484 | input_unregister_handler(&evdev_handler); | |
485 | } | |
486 | ||
487 | module_init(evdev_init); | |
488 | module_exit(evdev_exit); | |
489 | ||
490 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
491 | MODULE_DESCRIPTION("Input driver event char devices"); | |
492 | MODULE_LICENSE("GPL"); |