Commit | Line | Data |
---|---|---|
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; | |
1e0afb28 | 81 | |
1da177e4 | 82 | retval = fasync_helper(fd, file, on, &list->fasync); |
1e0afb28 | 83 | |
1da177e4 LT |
84 | return retval < 0 ? retval : 0; |
85 | } | |
86 | ||
1e0afb28 | 87 | static int evdev_flush(struct file *file, fl_owner_t id) |
1da177e4 LT |
88 | { |
89 | struct evdev_list *list = file->private_data; | |
1e0afb28 DT |
90 | |
91 | if (!list->evdev->exist) | |
92 | return -ENODEV; | |
93 | ||
1da177e4 LT |
94 | return input_flush_device(&list->evdev->handle, file); |
95 | } | |
96 | ||
97 | static void evdev_free(struct evdev *evdev) | |
98 | { | |
99 | evdev_table[evdev->minor] = NULL; | |
100 | kfree(evdev); | |
101 | } | |
102 | ||
103 | static int evdev_release(struct inode * inode, struct file * file) | |
104 | { | |
105 | struct evdev_list *list = file->private_data; | |
106 | ||
107 | if (list->evdev->grab == list) { | |
108 | input_release_device(&list->evdev->handle); | |
109 | list->evdev->grab = NULL; | |
110 | } | |
111 | ||
112 | evdev_fasync(-1, file, 0); | |
113 | list_del(&list->node); | |
114 | ||
115 | if (!--list->evdev->open) { | |
116 | if (list->evdev->exist) | |
117 | input_close_device(&list->evdev->handle); | |
118 | else | |
119 | evdev_free(list->evdev); | |
120 | } | |
121 | ||
122 | kfree(list); | |
123 | return 0; | |
124 | } | |
125 | ||
126 | static int evdev_open(struct inode * inode, struct file * file) | |
127 | { | |
128 | struct evdev_list *list; | |
129 | int i = iminor(inode) - EVDEV_MINOR_BASE; | |
1da177e4 LT |
130 | |
131 | if (i >= EVDEV_MINORS || !evdev_table[i] || !evdev_table[i]->exist) | |
132 | return -ENODEV; | |
133 | ||
b39787a9 | 134 | if (!(list = kzalloc(sizeof(struct evdev_list), GFP_KERNEL))) |
1da177e4 | 135 | return -ENOMEM; |
1da177e4 LT |
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 | ||
52658bb6 | 148 | #ifdef CONFIG_COMPAT |
3a51f7c4 | 149 | |
52658bb6 JK |
150 | struct input_event_compat { |
151 | struct compat_timeval time; | |
152 | __u16 type; | |
153 | __u16 code; | |
154 | __s32 value; | |
155 | }; | |
156 | ||
bf2fcc6f AK |
157 | /* Note to the author of this code: did it ever occur to |
158 | you why the ifdefs are needed? Think about it again. -AK */ | |
52658bb6 | 159 | #ifdef CONFIG_X86_64 |
bf2fcc6f | 160 | # define COMPAT_TEST is_compat_task() |
52658bb6 | 161 | #elif defined(CONFIG_IA64) |
6450578f | 162 | # define COMPAT_TEST IS_IA32_PROCESS(task_pt_regs(current)) |
347a8dc3 | 163 | #elif defined(CONFIG_S390) |
52658bb6 | 164 | # define COMPAT_TEST test_thread_flag(TIF_31BIT) |
59df6bbf RB |
165 | #elif defined(CONFIG_MIPS) |
166 | # define COMPAT_TEST (current->thread.mflags & MF_32BIT_ADDR) | |
52658bb6 JK |
167 | #else |
168 | # define COMPAT_TEST test_thread_flag(TIF_32BIT) | |
169 | #endif | |
170 | ||
3a51f7c4 | 171 | static inline size_t evdev_event_size(void) |
52658bb6 | 172 | { |
3a51f7c4 DT |
173 | return COMPAT_TEST ? |
174 | sizeof(struct input_event_compat) : sizeof(struct input_event); | |
175 | } | |
52658bb6 | 176 | |
3a51f7c4 DT |
177 | static int evdev_event_from_user(const char __user *buffer, struct input_event *event) |
178 | { | |
179 | if (COMPAT_TEST) { | |
180 | struct input_event_compat compat_event; | |
181 | ||
182 | if (copy_from_user(&compat_event, buffer, sizeof(struct input_event_compat))) | |
183 | return -EFAULT; | |
184 | ||
185 | event->time.tv_sec = compat_event.time.tv_sec; | |
186 | event->time.tv_usec = compat_event.time.tv_usec; | |
187 | event->type = compat_event.type; | |
188 | event->code = compat_event.code; | |
189 | event->value = compat_event.value; | |
190 | ||
191 | } else { | |
192 | if (copy_from_user(event, buffer, sizeof(struct input_event))) | |
52658bb6 | 193 | return -EFAULT; |
52658bb6 JK |
194 | } |
195 | ||
3a51f7c4 | 196 | return 0; |
52658bb6 | 197 | } |
52658bb6 | 198 | |
3a51f7c4 | 199 | static int evdev_event_to_user(char __user *buffer, const struct input_event *event) |
1da177e4 | 200 | { |
3a51f7c4 DT |
201 | if (COMPAT_TEST) { |
202 | struct input_event_compat compat_event; | |
1da177e4 | 203 | |
3a51f7c4 DT |
204 | compat_event.time.tv_sec = event->time.tv_sec; |
205 | compat_event.time.tv_usec = event->time.tv_usec; | |
206 | compat_event.type = event->type; | |
207 | compat_event.code = event->code; | |
208 | compat_event.value = event->value; | |
52658bb6 | 209 | |
3a51f7c4 DT |
210 | if (copy_to_user(buffer, &compat_event, sizeof(struct input_event_compat))) |
211 | return -EFAULT; | |
1da177e4 | 212 | |
3a51f7c4 DT |
213 | } else { |
214 | if (copy_to_user(buffer, event, sizeof(struct input_event))) | |
1da177e4 | 215 | return -EFAULT; |
1da177e4 LT |
216 | } |
217 | ||
3a51f7c4 | 218 | return 0; |
1da177e4 LT |
219 | } |
220 | ||
3a51f7c4 DT |
221 | #else |
222 | ||
223 | static inline size_t evdev_event_size(void) | |
52658bb6 | 224 | { |
3a51f7c4 DT |
225 | return sizeof(struct input_event); |
226 | } | |
52658bb6 | 227 | |
3a51f7c4 DT |
228 | static int evdev_event_from_user(const char __user *buffer, struct input_event *event) |
229 | { | |
230 | if (copy_from_user(event, buffer, sizeof(struct input_event))) | |
231 | return -EFAULT; | |
52658bb6 | 232 | |
3a51f7c4 DT |
233 | return 0; |
234 | } | |
52658bb6 | 235 | |
3a51f7c4 DT |
236 | static int evdev_event_to_user(char __user *buffer, const struct input_event *event) |
237 | { | |
238 | if (copy_to_user(buffer, event, sizeof(struct input_event))) | |
239 | return -EFAULT; | |
52658bb6 | 240 | |
3a51f7c4 DT |
241 | return 0; |
242 | } | |
243 | ||
244 | #endif /* CONFIG_COMPAT */ | |
245 | ||
246 | static ssize_t evdev_write(struct file * file, const char __user * buffer, size_t count, loff_t *ppos) | |
247 | { | |
248 | struct evdev_list *list = file->private_data; | |
249 | struct input_event event; | |
250 | int retval = 0; | |
52658bb6 JK |
251 | |
252 | if (!list->evdev->exist) | |
253 | return -ENODEV; | |
254 | ||
3a51f7c4 DT |
255 | while (retval < count) { |
256 | ||
257 | if (evdev_event_from_user(buffer + retval, &event)) | |
258 | return -EFAULT; | |
0e739d28 | 259 | input_inject_event(&list->evdev->handle, event.type, event.code, event.value); |
3a51f7c4 | 260 | retval += evdev_event_size(); |
52658bb6 JK |
261 | } |
262 | ||
263 | return retval; | |
264 | } | |
52658bb6 | 265 | |
1da177e4 LT |
266 | static ssize_t evdev_read(struct file * file, char __user * buffer, size_t count, loff_t *ppos) |
267 | { | |
268 | struct evdev_list *list = file->private_data; | |
269 | int retval; | |
270 | ||
3a51f7c4 | 271 | if (count < evdev_event_size()) |
1da177e4 LT |
272 | return -EINVAL; |
273 | ||
274 | if (list->head == list->tail && list->evdev->exist && (file->f_flags & O_NONBLOCK)) | |
275 | return -EAGAIN; | |
276 | ||
277 | retval = wait_event_interruptible(list->evdev->wait, | |
278 | list->head != list->tail || (!list->evdev->exist)); | |
279 | ||
280 | if (retval) | |
281 | return retval; | |
282 | ||
283 | if (!list->evdev->exist) | |
284 | return -ENODEV; | |
285 | ||
3a51f7c4 DT |
286 | while (list->head != list->tail && retval + evdev_event_size() <= count) { |
287 | ||
288 | struct input_event *event = (struct input_event *) list->buffer + list->tail; | |
289 | ||
290 | if (evdev_event_to_user(buffer + retval, event)) | |
291 | return -EFAULT; | |
292 | ||
1da177e4 | 293 | list->tail = (list->tail + 1) & (EVDEV_BUFFER_SIZE - 1); |
3a51f7c4 | 294 | retval += evdev_event_size(); |
1da177e4 LT |
295 | } |
296 | ||
297 | return retval; | |
298 | } | |
299 | ||
300 | /* No kernel lock - fine */ | |
301 | static unsigned int evdev_poll(struct file *file, poll_table *wait) | |
302 | { | |
303 | struct evdev_list *list = file->private_data; | |
1e0afb28 | 304 | |
1da177e4 LT |
305 | poll_wait(file, &list->evdev->wait, wait); |
306 | return ((list->head == list->tail) ? 0 : (POLLIN | POLLRDNORM)) | | |
307 | (list->evdev->exist ? 0 : (POLLHUP | POLLERR)); | |
308 | } | |
309 | ||
3a51f7c4 DT |
310 | #ifdef CONFIG_COMPAT |
311 | ||
312 | #define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8) | |
313 | #define NBITS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1) | |
314 | ||
315 | #ifdef __BIG_ENDIAN | |
316 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
317 | unsigned int maxlen, void __user *p, int compat) | |
318 | { | |
319 | int len, i; | |
320 | ||
321 | if (compat) { | |
322 | len = NBITS_COMPAT(maxbit) * sizeof(compat_long_t); | |
323 | if (len < maxlen) | |
324 | len = maxlen; | |
325 | ||
326 | for (i = 0; i < len / sizeof(compat_long_t); i++) | |
327 | if (copy_to_user((compat_long_t __user *) p + i, | |
328 | (compat_long_t *) bits + | |
329 | i + 1 - ((i % 2) << 1), | |
330 | sizeof(compat_long_t))) | |
331 | return -EFAULT; | |
332 | } else { | |
333 | len = NBITS(maxbit) * sizeof(long); | |
334 | if (len > maxlen) | |
335 | len = maxlen; | |
336 | ||
337 | if (copy_to_user(p, bits, len)) | |
338 | return -EFAULT; | |
339 | } | |
340 | ||
341 | return len; | |
342 | } | |
343 | #else | |
344 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
345 | unsigned int maxlen, void __user *p, int compat) | |
346 | { | |
347 | int len = compat ? | |
348 | NBITS_COMPAT(maxbit) * sizeof(compat_long_t) : | |
349 | NBITS(maxbit) * sizeof(long); | |
350 | ||
351 | if (len > maxlen) | |
352 | len = maxlen; | |
353 | ||
354 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
355 | } | |
356 | #endif /* __BIG_ENDIAN */ | |
357 | ||
358 | #else | |
359 | ||
360 | static int bits_to_user(unsigned long *bits, unsigned int maxbit, | |
361 | unsigned int maxlen, void __user *p, int compat) | |
362 | { | |
363 | int len = NBITS(maxbit) * sizeof(long); | |
364 | ||
365 | if (len > maxlen) | |
366 | len = maxlen; | |
367 | ||
368 | return copy_to_user(p, bits, len) ? -EFAULT : len; | |
369 | } | |
370 | ||
371 | #endif /* CONFIG_COMPAT */ | |
372 | ||
373 | static int str_to_user(const char *str, unsigned int maxlen, void __user *p) | |
374 | { | |
375 | int len; | |
376 | ||
377 | if (!str) | |
378 | return -ENOENT; | |
379 | ||
380 | len = strlen(str) + 1; | |
381 | if (len > maxlen) | |
382 | len = maxlen; | |
383 | ||
384 | return copy_to_user(p, str, len) ? -EFAULT : len; | |
385 | } | |
386 | ||
387 | static long evdev_ioctl_handler(struct file *file, unsigned int cmd, | |
388 | void __user *p, int compat_mode) | |
1da177e4 LT |
389 | { |
390 | struct evdev_list *list = file->private_data; | |
391 | struct evdev *evdev = list->evdev; | |
392 | struct input_dev *dev = evdev->handle.dev; | |
393 | struct input_absinfo abs; | |
509ca1a9 | 394 | struct ff_effect effect; |
3a51f7c4 | 395 | int __user *ip = (int __user *)p; |
1da177e4 | 396 | int i, t, u, v; |
509ca1a9 | 397 | int error; |
1da177e4 | 398 | |
3a51f7c4 DT |
399 | if (!evdev->exist) |
400 | return -ENODEV; | |
1da177e4 LT |
401 | |
402 | switch (cmd) { | |
403 | ||
404 | case EVIOCGVERSION: | |
405 | return put_user(EV_VERSION, ip); | |
406 | ||
407 | case EVIOCGID: | |
3a51f7c4 DT |
408 | if (copy_to_user(p, &dev->id, sizeof(struct input_id))) |
409 | return -EFAULT; | |
08791e5c DT |
410 | return 0; |
411 | ||
412 | case EVIOCGREP: | |
413 | if (!test_bit(EV_REP, dev->evbit)) | |
414 | return -ENOSYS; | |
415 | if (put_user(dev->rep[REP_DELAY], ip)) | |
416 | return -EFAULT; | |
417 | if (put_user(dev->rep[REP_PERIOD], ip + 1)) | |
418 | return -EFAULT; | |
419 | return 0; | |
420 | ||
421 | case EVIOCSREP: | |
422 | if (!test_bit(EV_REP, dev->evbit)) | |
423 | return -ENOSYS; | |
424 | if (get_user(u, ip)) | |
425 | return -EFAULT; | |
426 | if (get_user(v, ip + 1)) | |
427 | return -EFAULT; | |
428 | ||
0e739d28 DT |
429 | input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u); |
430 | input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v); | |
3a51f7c4 DT |
431 | |
432 | return 0; | |
1da177e4 LT |
433 | |
434 | case EVIOCGKEYCODE: | |
3a51f7c4 DT |
435 | if (get_user(t, ip)) |
436 | return -EFAULT; | |
c8e4c772 MR |
437 | |
438 | error = dev->getkeycode(dev, t, &v); | |
439 | if (error) | |
440 | return error; | |
441 | ||
442 | if (put_user(v, ip + 1)) | |
3a51f7c4 | 443 | return -EFAULT; |
c8e4c772 | 444 | |
1da177e4 LT |
445 | return 0; |
446 | ||
447 | case EVIOCSKEYCODE: | |
c8e4c772 | 448 | if (get_user(t, ip) || get_user(v, ip + 1)) |
3a51f7c4 | 449 | return -EFAULT; |
3a51f7c4 | 450 | |
c8e4c772 | 451 | return dev->setkeycode(dev, t, v); |
1da177e4 LT |
452 | |
453 | case EVIOCSFF: | |
509ca1a9 AH |
454 | if (copy_from_user(&effect, p, sizeof(effect))) |
455 | return -EFAULT; | |
1da177e4 | 456 | |
509ca1a9 | 457 | error = input_ff_upload(dev, &effect, file); |
3a51f7c4 | 458 | |
509ca1a9 AH |
459 | if (put_user(effect.id, &(((struct ff_effect __user *)p)->id))) |
460 | return -EFAULT; | |
461 | ||
462 | return error; | |
463 | ||
464 | case EVIOCRMFF: | |
465 | return input_ff_erase(dev, (int)(unsigned long) p, file); | |
1da177e4 LT |
466 | |
467 | case EVIOCGEFFECTS: | |
509ca1a9 AH |
468 | i = test_bit(EV_FF, dev->evbit) ? dev->ff->max_effects : 0; |
469 | if (put_user(i, ip)) | |
1da177e4 LT |
470 | return -EFAULT; |
471 | return 0; | |
472 | ||
473 | case EVIOCGRAB: | |
3a51f7c4 | 474 | if (p) { |
1da177e4 LT |
475 | if (evdev->grab) |
476 | return -EBUSY; | |
477 | if (input_grab_device(&evdev->handle)) | |
478 | return -EBUSY; | |
479 | evdev->grab = list; | |
480 | return 0; | |
481 | } else { | |
482 | if (evdev->grab != list) | |
483 | return -EINVAL; | |
484 | input_release_device(&evdev->handle); | |
485 | evdev->grab = NULL; | |
486 | return 0; | |
487 | } | |
488 | ||
489 | default: | |
490 | ||
41e979f8 | 491 | if (_IOC_TYPE(cmd) != 'E') |
1da177e4 LT |
492 | return -EINVAL; |
493 | ||
41e979f8 VP |
494 | if (_IOC_DIR(cmd) == _IOC_READ) { |
495 | ||
496 | if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0,0))) { | |
497 | ||
498 | long *bits; | |
499 | int len; | |
500 | ||
501 | switch (_IOC_NR(cmd) & EV_MAX) { | |
502 | case 0: bits = dev->evbit; len = EV_MAX; break; | |
503 | case EV_KEY: bits = dev->keybit; len = KEY_MAX; break; | |
504 | case EV_REL: bits = dev->relbit; len = REL_MAX; break; | |
505 | case EV_ABS: bits = dev->absbit; len = ABS_MAX; break; | |
506 | case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break; | |
507 | case EV_LED: bits = dev->ledbit; len = LED_MAX; break; | |
508 | case EV_SND: bits = dev->sndbit; len = SND_MAX; break; | |
509 | case EV_FF: bits = dev->ffbit; len = FF_MAX; break; | |
31581066 | 510 | case EV_SW: bits = dev->swbit; len = SW_MAX; break; |
41e979f8 VP |
511 | default: return -EINVAL; |
512 | } | |
3a51f7c4 | 513 | return bits_to_user(bits, len, _IOC_SIZE(cmd), p, compat_mode); |
1da177e4 | 514 | } |
1da177e4 | 515 | |
3a51f7c4 DT |
516 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0))) |
517 | return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd), | |
518 | p, compat_mode); | |
1da177e4 | 519 | |
3a51f7c4 DT |
520 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0))) |
521 | return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd), | |
522 | p, compat_mode); | |
1da177e4 | 523 | |
3a51f7c4 DT |
524 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0))) |
525 | return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd), | |
526 | p, compat_mode); | |
1da177e4 | 527 | |
3a51f7c4 DT |
528 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0))) |
529 | return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd), | |
530 | p, compat_mode); | |
31581066 | 531 | |
3a51f7c4 DT |
532 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0))) |
533 | return str_to_user(dev->name, _IOC_SIZE(cmd), p); | |
1da177e4 | 534 | |
3a51f7c4 DT |
535 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0))) |
536 | return str_to_user(dev->phys, _IOC_SIZE(cmd), p); | |
1da177e4 | 537 | |
3a51f7c4 DT |
538 | if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0))) |
539 | return str_to_user(dev->uniq, _IOC_SIZE(cmd), p); | |
1da177e4 | 540 | |
41e979f8 | 541 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) { |
1da177e4 | 542 | |
41e979f8 | 543 | int t = _IOC_NR(cmd) & ABS_MAX; |
1da177e4 | 544 | |
41e979f8 VP |
545 | abs.value = dev->abs[t]; |
546 | abs.minimum = dev->absmin[t]; | |
547 | abs.maximum = dev->absmax[t]; | |
548 | abs.fuzz = dev->absfuzz[t]; | |
549 | abs.flat = dev->absflat[t]; | |
1da177e4 | 550 | |
41e979f8 VP |
551 | if (copy_to_user(p, &abs, sizeof(struct input_absinfo))) |
552 | return -EFAULT; | |
553 | ||
554 | return 0; | |
555 | } | |
1da177e4 | 556 | |
1da177e4 LT |
557 | } |
558 | ||
41e979f8 | 559 | if (_IOC_DIR(cmd) == _IOC_WRITE) { |
1da177e4 | 560 | |
41e979f8 | 561 | if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) { |
1da177e4 | 562 | |
41e979f8 VP |
563 | int t = _IOC_NR(cmd) & ABS_MAX; |
564 | ||
565 | if (copy_from_user(&abs, p, sizeof(struct input_absinfo))) | |
566 | return -EFAULT; | |
1da177e4 | 567 | |
41e979f8 VP |
568 | dev->abs[t] = abs.value; |
569 | dev->absmin[t] = abs.minimum; | |
570 | dev->absmax[t] = abs.maximum; | |
571 | dev->absfuzz[t] = abs.fuzz; | |
572 | dev->absflat[t] = abs.flat; | |
1da177e4 | 573 | |
41e979f8 VP |
574 | return 0; |
575 | } | |
1da177e4 | 576 | } |
1da177e4 LT |
577 | } |
578 | return -EINVAL; | |
579 | } | |
1da177e4 | 580 | |
3a51f7c4 DT |
581 | static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
582 | { | |
583 | return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0); | |
584 | } | |
41e979f8 | 585 | |
3a51f7c4 | 586 | #ifdef CONFIG_COMPAT |
52658bb6 JK |
587 | static long evdev_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) |
588 | { | |
3a51f7c4 | 589 | return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1); |
1da177e4 | 590 | } |
52658bb6 | 591 | #endif |
1da177e4 | 592 | |
66e66118 | 593 | static const struct file_operations evdev_fops = { |
1da177e4 LT |
594 | .owner = THIS_MODULE, |
595 | .read = evdev_read, | |
596 | .write = evdev_write, | |
597 | .poll = evdev_poll, | |
598 | .open = evdev_open, | |
599 | .release = evdev_release, | |
52658bb6 JK |
600 | .unlocked_ioctl = evdev_ioctl, |
601 | #ifdef CONFIG_COMPAT | |
602 | .compat_ioctl = evdev_ioctl_compat, | |
603 | #endif | |
1da177e4 LT |
604 | .fasync = evdev_fasync, |
605 | .flush = evdev_flush | |
606 | }; | |
607 | ||
5b2a0826 DT |
608 | static int evdev_connect(struct input_handler *handler, struct input_dev *dev, |
609 | const struct input_device_id *id) | |
1da177e4 LT |
610 | { |
611 | struct evdev *evdev; | |
c9bcd582 | 612 | struct class_device *cdev; |
5b2a0826 | 613 | dev_t devt; |
1da177e4 | 614 | int minor; |
5b2a0826 | 615 | int error; |
1da177e4 LT |
616 | |
617 | for (minor = 0; minor < EVDEV_MINORS && evdev_table[minor]; minor++); | |
618 | if (minor == EVDEV_MINORS) { | |
619 | printk(KERN_ERR "evdev: no more free evdev devices\n"); | |
5b2a0826 | 620 | return -ENFILE; |
1da177e4 LT |
621 | } |
622 | ||
5b2a0826 DT |
623 | evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL); |
624 | if (!evdev) | |
625 | return -ENOMEM; | |
1da177e4 LT |
626 | |
627 | INIT_LIST_HEAD(&evdev->list); | |
628 | init_waitqueue_head(&evdev->wait); | |
629 | ||
630 | evdev->exist = 1; | |
631 | evdev->minor = minor; | |
632 | evdev->handle.dev = dev; | |
633 | evdev->handle.name = evdev->name; | |
634 | evdev->handle.handler = handler; | |
635 | evdev->handle.private = evdev; | |
636 | sprintf(evdev->name, "event%d", minor); | |
637 | ||
638 | evdev_table[minor] = evdev; | |
639 | ||
5b2a0826 DT |
640 | devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor), |
641 | ||
642 | cdev = class_device_create(&input_class, &dev->cdev, devt, | |
643 | dev->cdev.dev, evdev->name); | |
644 | if (IS_ERR(cdev)) { | |
645 | error = PTR_ERR(cdev); | |
646 | goto err_free_evdev; | |
647 | } | |
c9bcd582 GKH |
648 | |
649 | /* temporary symlink to keep userspace happy */ | |
5b2a0826 DT |
650 | error = sysfs_create_link(&input_class.subsys.kset.kobj, |
651 | &cdev->kobj, evdev->name); | |
652 | if (error) | |
653 | goto err_cdev_destroy; | |
654 | ||
655 | error = input_register_handle(&evdev->handle); | |
656 | if (error) | |
657 | goto err_remove_link; | |
1da177e4 | 658 | |
5b2a0826 DT |
659 | return 0; |
660 | ||
661 | err_remove_link: | |
662 | sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name); | |
663 | err_cdev_destroy: | |
664 | class_device_destroy(&input_class, devt); | |
665 | err_free_evdev: | |
666 | kfree(evdev); | |
667 | evdev_table[minor] = NULL; | |
668 | return error; | |
1da177e4 LT |
669 | } |
670 | ||
671 | static void evdev_disconnect(struct input_handle *handle) | |
672 | { | |
673 | struct evdev *evdev = handle->private; | |
674 | struct evdev_list *list; | |
675 | ||
5b2a0826 DT |
676 | input_unregister_handle(handle); |
677 | ||
c9bcd582 | 678 | sysfs_remove_link(&input_class.subsys.kset.kobj, evdev->name); |
ea9f240b | 679 | class_device_destroy(&input_class, |
1235686f | 680 | MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + evdev->minor)); |
1da177e4 LT |
681 | evdev->exist = 0; |
682 | ||
683 | if (evdev->open) { | |
509ca1a9 | 684 | input_flush_device(handle, NULL); |
1da177e4 LT |
685 | input_close_device(handle); |
686 | wake_up_interruptible(&evdev->wait); | |
687 | list_for_each_entry(list, &evdev->list, node) | |
688 | kill_fasync(&list->fasync, SIGIO, POLL_HUP); | |
689 | } else | |
690 | evdev_free(evdev); | |
691 | } | |
692 | ||
66e66118 | 693 | static const struct input_device_id evdev_ids[] = { |
1da177e4 LT |
694 | { .driver_info = 1 }, /* Matches all devices */ |
695 | { }, /* Terminating zero entry */ | |
696 | }; | |
697 | ||
698 | MODULE_DEVICE_TABLE(input, evdev_ids); | |
699 | ||
700 | static struct input_handler evdev_handler = { | |
701 | .event = evdev_event, | |
702 | .connect = evdev_connect, | |
703 | .disconnect = evdev_disconnect, | |
704 | .fops = &evdev_fops, | |
705 | .minor = EVDEV_MINOR_BASE, | |
706 | .name = "evdev", | |
707 | .id_table = evdev_ids, | |
708 | }; | |
709 | ||
710 | static int __init evdev_init(void) | |
711 | { | |
4263cf0f | 712 | return input_register_handler(&evdev_handler); |
1da177e4 LT |
713 | } |
714 | ||
715 | static void __exit evdev_exit(void) | |
716 | { | |
717 | input_unregister_handler(&evdev_handler); | |
718 | } | |
719 | ||
720 | module_init(evdev_init); | |
721 | module_exit(evdev_exit); | |
722 | ||
723 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); | |
724 | MODULE_DESCRIPTION("Input driver event char devices"); | |
725 | MODULE_LICENSE("GPL"); |