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> | |
52658bb6 | 23 | #include <linux/compat.h> |
1da177e4 LT |
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 | ||
b39787a9 | 133 | if (!(list = kzalloc(sizeof(struct evdev_list), GFP_KERNEL))) |
1da177e4 | 134 | return -ENOMEM; |
1da177e4 LT |
135 | |
136 | list->evdev = evdev_table[i]; | |
137 | list_add_tail(&list->node, &evdev_table[i]->list); | |
138 | file->private_data = list; | |
139 | ||
140 | if (!list->evdev->open++) | |
141 | if (list->evdev->exist) | |
142 | input_open_device(&list->evdev->handle); | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
52658bb6 | 147 | #ifdef CONFIG_COMPAT |
3a51f7c4 | 148 | |
52658bb6 JK |
149 | struct input_event_compat { |
150 | struct compat_timeval time; | |
151 | __u16 type; | |
152 | __u16 code; | |
153 | __s32 value; | |
154 | }; | |
155 | ||
bf2fcc6f AK |
156 | /* Note to the author of this code: did it ever occur to |
157 | you why the ifdefs are needed? Think about it again. -AK */ | |
52658bb6 | 158 | #ifdef CONFIG_X86_64 |
bf2fcc6f | 159 | # define COMPAT_TEST is_compat_task() |
52658bb6 | 160 | #elif defined(CONFIG_IA64) |
6450578f | 161 | # define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current)) |
347a8dc3 | 162 | #elif defined(CONFIG_S390) |
52658bb6 | 163 | # define COMPAT_TEST test_thread_flag(TIF_31BIT) |
59df6bbf RB |
164 | #elif defined(CONFIG_MIPS) |
165 | # define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR) | |
52658bb6 JK |
166 | #else |
167 | # define COMPAT_TEST test_thread_flag(TIF_32BIT) | |
168 | #endif | |
169 | ||
3a51f7c4 | 170 | static inline size_t evdev_event_size(void) |
52658bb6 | 171 | { |
3a51f7c4 DT |
172 | return COMPAT_TEST ? |
173 | sizeof(struct input_event_compat) : sizeof(struct input_event); | |
174 | } | |
52658bb6 | 175 | |
3a51f7c4 DT |
176 | static int evdev_event_from_user(const char __user *buffer, struct input_event *event) |
177 | { | |
178 | if (COMPAT_TEST) { | |
179 | struct input_event_compat compat_event; | |
180 | ||
181 | if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat))) | |
182 | return -EFAULT; | |
183 | ||
184 | event->time.tv_sec = compat_event.time.tv_sec; | |
185 | event->time.tv_usec = compat_event.time.tv_usec; | |
186 | event->type = compat_event.type; | |
187 | event->code = compat_event.code; | |
188 | event->value = compat_event.value; | |
189 | ||
190 | } else { | |
191 | if (copy_from_user(event, buffer, sizeof(struct input_event))) | |
52658bb6 | 192 | return -EFAULT; |
52658bb6 JK |
193 | } |
194 | ||
3a51f7c4 | 195 | return 0; |
52658bb6 | 196 | } |
52658bb6 | 197 | |
3a51f7c4 | 198 | static int evdev_event_to_user(char __user *buffer, const struct input_event *event) |
1da177e4 | 199 | { |
3a51f7c4 DT |
200 | if (COMPAT_TEST) { |
201 | struct input_event_compat compat_event; | |
1da177e4 | 202 | |
3a51f7c4 DT |
203 | compat_event.time.tv_sec = event->time.tv_sec; |
204 | compat_event.time.tv_usec = event->time.tv_usec; | |
205 | compat_event.type = event->type; | |
206 | compat_event.code = event->code; | |
207 | compat_event.value = event->value; | |
52658bb6 | 208 | |
3a51f7c4 DT |
209 | if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat))) |
210 | return -EFAULT; | |
1da177e4 | 211 | |
3a51f7c4 DT |
212 | } else { |
213 | if (copy_to_user(buffer, event, sizeof(struct input_event))) | |
1da177e4 | 214 | return -EFAULT; |
1da177e4 LT |
215 | } |
216 | ||
3a51f7c4 | 217 | return 0; |
1da177e4 LT |
218 | } |
219 | ||
3a51f7c4 DT |
220 | #else |
221 | ||
222 | static inline size_t evdev_event_size(void) | |
52658bb6 | 223 | { |
3a51f7c4 DT |
224 | return sizeof(struct input_event); |
225 | } | |
52658bb6 | 226 | |
3a51f7c4 DT |
227 | static int evdev_event_from_user(const char __user *buffer, struct input_event *event) |
228 | { | |
229 | if (copy_from_user(event, buffer, sizeof(struct input_event))) | |
230 | return -EFAULT; | |
52658bb6 | 231 | |
3a51f7c4 DT |
232 | return 0; |
233 | } | |
52658bb6 | 234 | |
3a51f7c4 DT |
235 | static int evdev_event_to_user(char __user *buffer, const struct input_event *event) |
236 | { | |
237 | if (copy_to_user(buffer, event, sizeof(struct input_event))) | |
238 | return -EFAULT; | |
52658bb6 | 239 | |
3a51f7c4 DT |
240 | return 0; |
241 | } | |
242 | ||
243 | #endif /* CONFIG_COMPAT */ | |
244 | ||
245 | static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
246 | { | |
247 | struct evdev_list *list = file->private_data; | |
248 | struct input_event event; | |
249 | int retval = 0; | |
52658bb6 JK |
250 | |
251 | if (!list->evdev->exist) | |
252 | return -ENODEV; | |
253 | ||
3a51f7c4 DT |
254 | while (retval < count) { |
255 | ||
256 | if (evdev_event_from_user(buffer + retval, &event)) | |
257 | return -EFAULT; | |
258 | input_event(list->evdev->handle.dev, event.type, event.code, event.value); | |
259 | retval += evdev_event_size(); | |
52658bb6 JK |
260 | } |
261 | ||
262 | return retval; | |
263 | } | |
52658bb6 | 264 | |
1da177e4 LT |
265 | static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) |
266 | { | |
267 | struct evdev_list *list = file->private_data; | |
268 | int retval; | |
269 | ||
3a51f7c4 | 270 | if (count < evdev_event_size()) |
1da177e4 LT |
271 | return -EINVAL; |
272 | ||
273 | if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) | |
274 | return -EAGAIN; | |
275 | ||
276 | retval = wait_event_interruptible(list->evdev->wait, | |
277 | list->head != list->tail || (!list->evdev->exist)); | |
278 | ||
279 | if (retval) | |
280 | return retval; | |
281 | ||
282 | if (!list->evdev->exist) | |
283 | return -ENODEV; | |
284 | ||
3a51f7c4 DT |
285 | while (list->head != list->tail && retval + evdev_event_size() <= count) { |
286 | ||
287 | struct input_event *event = (struct input_event *) list->buffer + list->tail; | |
288 | ||
289 | if (evdev_event_to_user(buffer + retval, event)) | |
290 | return -EFAULT; | |
291 | ||
1da177e4 | 292 | list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); |
3a51f7c4 | 293 | retval += evdev_event_size(); |
1da177e4 LT |
294 | } |
295 | ||
296 | return retval; | |
297 | } | |
298 | ||
299 | /* No kernel lock - fine */ | |
300 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
301 | { | |
302 | struct evdev_list *list = file->private_data; | |
303 | poll_wait(file, &list->evdev->wait, wait); | |
304 | return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) | | |
305 | (list->evdev->exist ? 0 : (POLLHUP | POLLERR)); | |
306 | } | |
307 | ||
3a51f7c4 DT |
308 | #ifdef CONFIG_COMPAT |
309 | ||
310 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
311 | #define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) | |
312 | ||
313 | #ifdef __BIG_ENDIAN | |
314 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
315 | unsigned int maxlen, void __user *p, int compat) | |
316 | { | |
317 | int len, i; | |
318 | ||
319 | if (compat) { | |
320 | len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t); | |
321 | if (len < maxlen) | |
322 | len = maxlen; | |
323 | ||
324 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
325 | if (copy_to_user((compat_long_t __user *) p + i, | |
326 | (compat_long_t *) bits + | |
327 | i + 1 - ((i % 2) << 1), | |
328 | sizeof(compat_long_t))) | |
329 | return -EFAULT; | |
330 | } else { | |
331 | len = NBITS(maxbit) * sizeof(long); | |
332 | if (len > maxlen) | |
333 | len = maxlen; | |
334 | ||
335 | if (copy_to_user(p, bits, len)) | |
336 | return -EFAULT; | |
337 | } | |
338 | ||
339 | return len; | |
340 | } | |
341 | #else | |
342 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
343 | unsigned int maxlen, void __user *p, int compat) | |
344 | { | |
345 | int len = compat ? | |
346 | NBITS_COMPAT(maxbit) * sizeof(compat_long_t) : | |
347 | NBITS(maxbit) * sizeof(long); | |
348 | ||
349 | if (len > maxlen) | |
350 | len = maxlen; | |
351 | ||
352 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
353 | } | |
354 | #endif /* __BIG_ENDIAN */ | |
355 | ||
356 | #else | |
357 | ||
358 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
359 | unsigned int maxlen, void __user *p, int compat) | |
360 | { | |
361 | int len = NBITS(maxbit) * sizeof(long); | |
362 | ||
363 | if (len > maxlen) | |
364 | len = maxlen; | |
365 | ||
366 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
367 | } | |
368 | ||
369 | #endif /* CONFIG_COMPAT */ | |
370 | ||
371 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
372 | { | |
373 | int len; | |
374 | ||
375 | if (!str) | |
376 | return -ENOENT; | |
377 | ||
378 | len = strlen(str) + 1; | |
379 | if (len > maxlen) | |
380 | len = maxlen; | |
381 | ||
382 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
383 | } | |
384 | ||
385 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, | |
386 | void __user *p, int compat_mode) | |
1da177e4 LT |
387 | { |
388 | struct evdev_list *list = file->private_data; | |
389 | struct evdev *evdev = list->evdev; | |
390 | struct input_dev *dev = evdev->handle.dev; | |
391 | struct input_absinfo abs; | |
3a51f7c4 | 392 | int __user *ip = (int __user *)p; |
1da177e4 LT |
393 | int i, t, u, v; |
394 | ||
3a51f7c4 DT |
395 | if (!evdev->exist) |
396 | return -ENODEV; | |
1da177e4 LT |
397 | |
398 | switch (cmd) { | |
399 | ||
400 | case EVIOCGVERSION: | |
401 | return put_user(EV_VERSION, ip); | |
402 | ||
403 | case EVIOCGID: | |
3a51f7c4 DT |
404 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) |
405 | return -EFAULT; | |
406 | ||
407 | return 0; | |
1da177e4 LT |
408 | |
409 | case EVIOCGKEYCODE: | |
3a51f7c4 DT |
410 | if (get_user(t, ip)) |
411 | return -EFAULT; | |
412 | if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) | |
413 | return -EINVAL; | |
414 | if (put_user(INPUT_KEYCODE(dev, t), ip + 1)) | |
415 | return -EFAULT; | |
1da177e4 LT |
416 | return 0; |
417 | ||
418 | case EVIOCSKEYCODE: | |
3a51f7c4 DT |
419 | if (get_user(t, ip)) |
420 | return -EFAULT; | |
421 | if (t < 0 || t >= dev->keycodemax || !dev->keycodesize) | |
422 | return -EINVAL; | |
423 | if (get_user(v, ip + 1)) | |
424 | return -EFAULT; | |
425 | if (v < 0 || v > KEY_MAX) | |
426 | return -EINVAL; | |
427 | if (dev->keycodesize < sizeof(v) && (v >> (dev->keycodesize * 8))) | |
428 | return -EINVAL; | |
429 | ||
1da177e4 LT |
430 | u = SET_INPUT_KEYCODE(dev, t, v); |
431 | clear_bit(u, dev->keybit); | |
432 | set_bit(v, dev->keybit); | |
433 | for (i = 0; i < dev->keycodemax; i++) | |
3a51f7c4 | 434 | if (INPUT_KEYCODE(dev, i) == u) |
1da177e4 | 435 | set_bit(u, dev->keybit); |
3a51f7c4 | 436 | |
1da177e4 LT |
437 | return 0; |
438 | ||
439 | case EVIOCSFF: | |
440 | if (dev->upload_effect) { | |
441 | struct ff_effect effect; | |
442 | int err; | |
443 | ||
444 | if (copy_from_user(&effect, p, sizeof(effect))) | |
445 | return -EFAULT; | |
446 | err = dev->upload_effect(dev, &effect); | |
3a51f7c4 | 447 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
1da177e4 LT |
448 | return -EFAULT; |
449 | return err; | |
3a51f7c4 DT |
450 | } else |
451 | return -ENOSYS; | |
1da177e4 LT |
452 | |
453 | case EVIOCRMFF: | |
3a51f7c4 DT |
454 | if (!dev->erase_effect) |
455 | return -ENOSYS; | |
456 | ||
457 | return dev->erase_effect(dev, (int)(unsigned long) p); | |
1da177e4 LT |
458 | |
459 | case EVIOCGEFFECTS: | |
460 | if (put_user(dev->ff_effects_max, ip)) | |
461 | return -EFAULT; | |
462 | return 0; | |
463 | ||
464 | case EVIOCGRAB: | |
3a51f7c4 | 465 | if (p) { |
1da177e4 LT |
466 | if (evdev->grab) |
467 | return -EBUSY; | |
468 | if (input_grab_device(&evdev->handle)) | |
469 | return -EBUSY; | |
470 | evdev->grab = list; | |
471 | return 0; | |
472 | } else { | |
473 | if (evdev->grab != list) | |
474 | return -EINVAL; | |
475 | input_release_device(&evdev->handle); | |
476 | evdev->grab = NULL; | |
477 | return 0; | |
478 | } | |
479 | ||
480 | default: | |
481 | ||
41e979f8 | 482 | if (_IOC_TYPE(cmd) != 'E') |
1da177e4 LT |
483 | return -EINVAL; |
484 | ||
41e979f8 VP |
485 | if (_IOC_DIR(cmd) == _IOC_READ) { |
486 | ||
487 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { | |
488 | ||
489 | long *bits; | |
490 | int len; | |
491 | ||
492 | switch (_IOC_NR(cmd) & EV_MAX) { | |
493 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
494 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
495 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
496 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
497 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
498 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
499 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
500 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
31581066 | 501 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; |
41e979f8 VP |
502 | default: return -EINVAL; |
503 | } | |
3a51f7c4 | 504 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
1da177e4 | 505 | } |
1da177e4 | 506 | |
3a51f7c4 DT |
507 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
508 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), | |
509 | p, compat_mode); | |
1da177e4 | 510 | |
3a51f7c4 DT |
511 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
512 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), | |
513 | p, compat_mode); | |
1da177e4 | 514 | |
3a51f7c4 DT |
515 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
516 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), | |
517 | p, compat_mode); | |
1da177e4 | 518 | |
3a51f7c4 DT |
519 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
520 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), | |
521 | p, compat_mode); | |
31581066 | 522 | |
3a51f7c4 DT |
523 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
524 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); | |
1da177e4 | 525 | |
3a51f7c4 DT |
526 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
527 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); | |
1da177e4 | 528 | |
3a51f7c4 DT |
529 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
530 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); | |
1da177e4 | 531 | |
41e979f8 | 532 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
1da177e4 | 533 | |
41e979f8 | 534 | int t = _IOC_NR(cmd) & ABS_MAX; |
1da177e4 | 535 | |
41e979f8 VP |
536 | abs.value = dev->abs[t]; |
537 | abs.minimum = dev->absmin[t]; | |
538 | abs.maximum = dev->absmax[t]; | |
539 | abs.fuzz = dev->absfuzz[t]; | |
540 | abs.flat = dev->absflat[t]; | |
1da177e4 | 541 | |
41e979f8 VP |
542 | if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) |
543 | return -EFAULT; | |
544 | ||
545 | return 0; | |
546 | } | |
1da177e4 | 547 | |
1da177e4 LT |
548 | } |
549 | ||
41e979f8 | 550 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
1da177e4 | 551 | |
41e979f8 | 552 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 553 | |
41e979f8 VP |
554 | int t = _IOC_NR(cmd) & ABS_MAX; |
555 | ||
556 | if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) | |
557 | return -EFAULT; | |
1da177e4 | 558 | |
41e979f8 VP |
559 | dev->abs[t] = abs.value; |
560 | dev->absmin[t] = abs.minimum; | |
561 | dev->absmax[t] = abs.maximum; | |
562 | dev->absfuzz[t] = abs.fuzz; | |
563 | dev->absflat[t] = abs.flat; | |
1da177e4 | 564 | |
41e979f8 VP |
565 | return 0; |
566 | } | |
1da177e4 | 567 | } |
1da177e4 LT |
568 | } |
569 | return -EINVAL; | |
570 | } | |
1da177e4 | 571 | |
3a51f7c4 DT |
572 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
573 | { | |
574 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
575 | } | |
41e979f8 | 576 | |
3a51f7c4 | 577 | #ifdef CONFIG_COMPAT |
52658bb6 JK |
578 | static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) |
579 | { | |
3a51f7c4 | 580 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 581 | } |
52658bb6 | 582 | #endif |
1da177e4 LT |
583 | |
584 | static struct file_operations evdev_fops = { | |
585 | .owner = THIS_MODULE, | |
586 | .read = evdev_read, | |
587 | .write = evdev_write, | |
588 | .poll = evdev_poll, | |
589 | .open = evdev_open, | |
590 | .release = evdev_release, | |
52658bb6 JK |
591 | .unlocked_ioctl = evdev_ioctl, |
592 | #ifdef CONFIG_COMPAT | |
593 | .compat_ioctl = evdev_ioctl_compat, | |
594 | #endif | |
1da177e4 LT |
595 | .fasync = evdev_fasync, |
596 | .flush = evdev_flush | |
597 | }; | |
598 | ||
599 | static struct input_handle *evdev_connect(struct input_handler *handler, struct input_dev *dev, struct input_device_id *id) | |
600 | { | |
601 | struct evdev *evdev; | |
c9bcd582 | 602 | struct class_device *cdev; |
1da177e4 LT |
603 | int minor; |
604 | ||
605 | for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++); | |
606 | if (minor == EVDEV_MINORS) { | |
607 | printk(KERN_ERR "evdev: no more free evdev devices\n"); | |
608 | return NULL; | |
609 | } | |
610 | ||
b39787a9 | 611 | if (!(evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL))) |
1da177e4 | 612 | return NULL; |
1da177e4 LT |
613 | |
614 | INIT_LIST_HEAD(&evdev->list); | |
615 | init_waitqueue_head(&evdev->wait); | |
616 | ||
617 | evdev->exist = 1; | |
618 | evdev->minor = minor; | |
619 | evdev->handle.dev = dev; | |
620 | evdev->handle.name = evdev->name; | |
621 | evdev->handle.handler = handler; | |
622 | evdev->handle.private = evdev; | |
623 | sprintf(evdev->name, "event%d", minor); | |
624 | ||
625 | evdev_table[minor] = evdev; | |
626 | ||
c9bcd582 | 627 | cdev = class_device_create(&input_class, &dev->cdev, |
1235686f | 628 | MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), |
c9bcd582 GKH |
629 | dev->cdev.dev, evdev->name); |
630 | ||
631 | /* temporary symlink to keep userspace happy */ | |
632 | sysfs_create_link(&input_class.subsys.kset.kobj, &cdev->kobj, | |
633 | evdev->name); | |
1da177e4 LT |
634 | |
635 | return &evdev->handle; | |
636 | } | |
637 | ||
638 | static void evdev_disconnect(struct input_handle *handle) | |
639 | { | |
640 | struct evdev *evdev = handle->private; | |
641 | struct evdev_list *list; | |
642 | ||
c9bcd582 | 643 | sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name); |
ea9f240b | 644 | class_device_destroy(&input_class, |
1235686f | 645 | MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor)); |
1da177e4 LT |
646 | evdev->exist = 0; |
647 | ||
648 | if (evdev->open) { | |
649 | input_close_device(handle); | |
650 | wake_up_interruptible(&evdev->wait); | |
651 | list_for_each_entry(list, &evdev->list, node) | |
652 | kill_fasync(&list->fasync, SIGIO, POLL_HUP); | |
653 | } else | |
654 | evdev_free(evdev); | |
655 | } | |
656 | ||
657 | static struct input_device_id evdev_ids[] = { | |
658 | { .driver_info = 1 }, /* Matches all devices */ | |
659 | { }, /* Terminating zero entry */ | |
660 | }; | |
661 | ||
662 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
663 | ||
664 | static struct input_handler evdev_handler = { | |
665 | .event = evdev_event, | |
666 | .connect = evdev_connect, | |
667 | .disconnect = evdev_disconnect, | |
668 | .fops = &evdev_fops, | |
669 | .minor = EVDEV_MINOR_BASE, | |
670 | .name = "evdev", | |
671 | .id_table = evdev_ids, | |
672 | }; | |
673 | ||
674 | static int __init evdev_init(void) | |
675 | { | |
676 | input_register_handler(&evdev_handler); | |
677 | return 0; | |
678 | } | |
679 | ||
680 | static void __exit evdev_exit(void) | |
681 | { | |
682 | input_unregister_handler(&evdev_handler); | |
683 | } | |
684 | ||
685 | module_init(evdev_init); | |
686 | module_exit(evdev_exit); | |
687 | ||
688 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
689 | MODULE_DESCRIPTION("Input driver event char devices"); | |
690 | MODULE_LICENSE("GPL"); |