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Commit | Line | Data |
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86166b7b JK |
1 | /* |
2 | * HID raw devices, giving access to raw HID events. | |
3 | * | |
4 | * In comparison to hiddev, this device does not process the | |
5 | * hid events at all (no parsing, no lookups). This lets applications | |
6 | * to work on raw hid events as they want to, and avoids a need to | |
7 | * use a transport-specific userspace libhid/libusb libraries. | |
8 | * | |
9 | * Copyright (c) 2007 Jiri Kosina | |
10 | */ | |
11 | ||
12 | /* | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms and conditions of the GNU General Public License, | |
15 | * version 2, as published by the Free Software Foundation. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License along with | |
18 | * this program; if not, write to the Free Software Foundation, Inc., | |
19 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
20 | */ | |
21 | ||
4291ee30 JP |
22 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
23 | ||
86166b7b JK |
24 | #include <linux/fs.h> |
25 | #include <linux/module.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/cdev.h> | |
30 | #include <linux/poll.h> | |
31 | #include <linux/device.h> | |
32 | #include <linux/major.h> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
86166b7b JK |
34 | #include <linux/hid.h> |
35 | #include <linux/mutex.h> | |
a99bbaf5 | 36 | #include <linux/sched.h> |
86166b7b JK |
37 | |
38 | #include <linux/hidraw.h> | |
39 | ||
40 | static int hidraw_major; | |
41 | static struct cdev hidraw_cdev; | |
42 | static struct class *hidraw_class; | |
43 | static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; | |
7d672cd7 | 44 | static DEFINE_MUTEX(minors_lock); |
86166b7b JK |
45 | |
46 | static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
47 | { | |
48 | struct hidraw_list *list = file->private_data; | |
49 | int ret = 0, len; | |
86166b7b JK |
50 | DECLARE_WAITQUEUE(wait, current); |
51 | ||
b0e14951 | 52 | mutex_lock(&list->read_mutex); |
86166b7b | 53 | |
b0e14951 | 54 | while (ret == 0) { |
86166b7b JK |
55 | if (list->head == list->tail) { |
56 | add_wait_queue(&list->hidraw->wait, &wait); | |
57 | set_current_state(TASK_INTERRUPTIBLE); | |
58 | ||
59 | while (list->head == list->tail) { | |
60 | if (file->f_flags & O_NONBLOCK) { | |
61 | ret = -EAGAIN; | |
62 | break; | |
63 | } | |
64 | if (signal_pending(current)) { | |
65 | ret = -ERESTARTSYS; | |
66 | break; | |
67 | } | |
68 | if (!list->hidraw->exist) { | |
69 | ret = -EIO; | |
70 | break; | |
71 | } | |
72 | ||
73 | /* allow O_NONBLOCK to work well from other threads */ | |
74 | mutex_unlock(&list->read_mutex); | |
75 | schedule(); | |
76 | mutex_lock(&list->read_mutex); | |
77 | set_current_state(TASK_INTERRUPTIBLE); | |
78 | } | |
79 | ||
80 | set_current_state(TASK_RUNNING); | |
81 | remove_wait_queue(&list->hidraw->wait, &wait); | |
82 | } | |
83 | ||
84 | if (ret) | |
85 | goto out; | |
86 | ||
86166b7b JK |
87 | len = list->buffer[list->tail].len > count ? |
88 | count : list->buffer[list->tail].len; | |
89 | ||
90 | if (copy_to_user(buffer, list->buffer[list->tail].value, len)) { | |
91 | ret = -EFAULT; | |
92 | goto out; | |
93 | } | |
cf28a673 | 94 | ret = len; |
86166b7b JK |
95 | |
96 | kfree(list->buffer[list->tail].value); | |
97 | list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); | |
98 | } | |
99 | out: | |
100 | mutex_unlock(&list->read_mutex); | |
101 | return ret; | |
102 | } | |
103 | ||
d2a1cfeb JK |
104 | /* The first byte is expected to be a report number. |
105 | * This function is to be called with the minors_lock mutex held */ | |
b4dbde9d | 106 | static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type) |
86166b7b JK |
107 | { |
108 | unsigned int minor = iminor(file->f_path.dentry->d_inode); | |
2e57480b | 109 | struct hid_device *dev; |
86166b7b JK |
110 | __u8 *buf; |
111 | int ret = 0; | |
112 | ||
e42dee9a AO |
113 | if (!hidraw_table[minor]) { |
114 | ret = -ENODEV; | |
115 | goto out; | |
116 | } | |
117 | ||
2e57480b JK |
118 | dev = hidraw_table[minor]->hid; |
119 | ||
120 | if (!dev->hid_output_raw_report) { | |
121 | ret = -ENODEV; | |
122 | goto out; | |
123 | } | |
86166b7b | 124 | |
2b107d62 | 125 | if (count > HID_MAX_BUFFER_SIZE) { |
4291ee30 JP |
126 | hid_warn(dev, "pid %d passed too large report\n", |
127 | task_pid_nr(current)); | |
2e57480b JK |
128 | ret = -EINVAL; |
129 | goto out; | |
86166b7b JK |
130 | } |
131 | ||
132 | if (count < 2) { | |
4291ee30 JP |
133 | hid_warn(dev, "pid %d passed too short report\n", |
134 | task_pid_nr(current)); | |
2e57480b JK |
135 | ret = -EINVAL; |
136 | goto out; | |
86166b7b JK |
137 | } |
138 | ||
139 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); | |
2e57480b JK |
140 | if (!buf) { |
141 | ret = -ENOMEM; | |
142 | goto out; | |
143 | } | |
86166b7b JK |
144 | |
145 | if (copy_from_user(buf, buffer, count)) { | |
146 | ret = -EFAULT; | |
2e57480b | 147 | goto out_free; |
86166b7b JK |
148 | } |
149 | ||
b4dbde9d | 150 | ret = dev->hid_output_raw_report(dev, buf, count, report_type); |
2e57480b | 151 | out_free: |
86166b7b | 152 | kfree(buf); |
2e57480b | 153 | out: |
b4dbde9d AO |
154 | return ret; |
155 | } | |
156 | ||
157 | /* the first byte is expected to be a report number */ | |
158 | static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
159 | { | |
160 | ssize_t ret; | |
161 | mutex_lock(&minors_lock); | |
162 | ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT); | |
2e57480b | 163 | mutex_unlock(&minors_lock); |
86166b7b JK |
164 | return ret; |
165 | } | |
166 | ||
b4dbde9d AO |
167 | |
168 | /* This function performs a Get_Report transfer over the control endpoint | |
d2a1cfeb JK |
169 | * per section 7.2.1 of the HID specification, version 1.1. The first byte |
170 | * of buffer is the report number to request, or 0x0 if the defice does not | |
171 | * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT | |
172 | * or HID_INPUT_REPORT. This function is to be called with the minors_lock | |
173 | * mutex held. */ | |
b4dbde9d AO |
174 | static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type) |
175 | { | |
176 | unsigned int minor = iminor(file->f_path.dentry->d_inode); | |
177 | struct hid_device *dev; | |
178 | __u8 *buf; | |
179 | int ret = 0, len; | |
180 | unsigned char report_number; | |
181 | ||
182 | dev = hidraw_table[minor]->hid; | |
183 | ||
184 | if (!dev->hid_get_raw_report) { | |
185 | ret = -ENODEV; | |
186 | goto out; | |
187 | } | |
188 | ||
189 | if (count > HID_MAX_BUFFER_SIZE) { | |
190 | printk(KERN_WARNING "hidraw: pid %d passed too large report\n", | |
191 | task_pid_nr(current)); | |
192 | ret = -EINVAL; | |
193 | goto out; | |
194 | } | |
195 | ||
196 | if (count < 2) { | |
197 | printk(KERN_WARNING "hidraw: pid %d passed too short report\n", | |
198 | task_pid_nr(current)); | |
199 | ret = -EINVAL; | |
200 | goto out; | |
201 | } | |
202 | ||
203 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); | |
204 | if (!buf) { | |
205 | ret = -ENOMEM; | |
206 | goto out; | |
207 | } | |
208 | ||
209 | /* Read the first byte from the user. This is the report number, | |
d2a1cfeb | 210 | * which is passed to dev->hid_get_raw_report(). */ |
b4dbde9d AO |
211 | if (copy_from_user(&report_number, buffer, 1)) { |
212 | ret = -EFAULT; | |
213 | goto out_free; | |
214 | } | |
215 | ||
216 | ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type); | |
217 | ||
218 | if (ret < 0) | |
219 | goto out_free; | |
220 | ||
221 | len = (ret < count) ? ret : count; | |
222 | ||
223 | if (copy_to_user(buffer, buf, len)) { | |
224 | ret = -EFAULT; | |
225 | goto out_free; | |
226 | } | |
227 | ||
228 | ret = len; | |
229 | ||
230 | out_free: | |
231 | kfree(buf); | |
232 | out: | |
233 | return ret; | |
234 | } | |
235 | ||
86166b7b JK |
236 | static unsigned int hidraw_poll(struct file *file, poll_table *wait) |
237 | { | |
238 | struct hidraw_list *list = file->private_data; | |
239 | ||
240 | poll_wait(file, &list->hidraw->wait, wait); | |
241 | if (list->head != list->tail) | |
242 | return POLLIN | POLLRDNORM; | |
243 | if (!list->hidraw->exist) | |
244 | return POLLERR | POLLHUP; | |
245 | return 0; | |
246 | } | |
247 | ||
248 | static int hidraw_open(struct inode *inode, struct file *file) | |
249 | { | |
250 | unsigned int minor = iminor(inode); | |
251 | struct hidraw *dev; | |
252 | struct hidraw_list *list; | |
253 | int err = 0; | |
254 | ||
255 | if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { | |
256 | err = -ENOMEM; | |
257 | goto out; | |
258 | } | |
259 | ||
7d672cd7 | 260 | mutex_lock(&minors_lock); |
86166b7b | 261 | if (!hidraw_table[minor]) { |
86166b7b JK |
262 | err = -ENODEV; |
263 | goto out_unlock; | |
264 | } | |
265 | ||
266 | list->hidraw = hidraw_table[minor]; | |
267 | mutex_init(&list->read_mutex); | |
268 | list_add_tail(&list->node, &hidraw_table[minor]->list); | |
269 | file->private_data = list; | |
270 | ||
271 | dev = hidraw_table[minor]; | |
7d672cd7 | 272 | if (!dev->open++) { |
5bea7660 | 273 | err = hid_hw_power(dev->hid, PM_HINT_FULLON); |
f554ff80 AN |
274 | if (err < 0) { |
275 | dev->open--; | |
5bea7660 | 276 | goto out_unlock; |
f554ff80 | 277 | } |
5bea7660 DT |
278 | |
279 | err = hid_hw_open(dev->hid); | |
0361a28d | 280 | if (err < 0) { |
5bea7660 | 281 | hid_hw_power(dev->hid, PM_HINT_NORMAL); |
7d672cd7 | 282 | dev->open--; |
0361a28d | 283 | } |
7d672cd7 | 284 | } |
86166b7b JK |
285 | |
286 | out_unlock: | |
7d672cd7 | 287 | mutex_unlock(&minors_lock); |
7d672cd7 | 288 | out: |
1a896231 AN |
289 | if (err < 0) |
290 | kfree(list); | |
86166b7b JK |
291 | return err; |
292 | ||
293 | } | |
294 | ||
295 | static int hidraw_release(struct inode * inode, struct file * file) | |
296 | { | |
297 | unsigned int minor = iminor(inode); | |
298 | struct hidraw *dev; | |
299 | struct hidraw_list *list = file->private_data; | |
cb174681 | 300 | int ret; |
86166b7b | 301 | |
cb174681 JS |
302 | mutex_lock(&minors_lock); |
303 | if (!hidraw_table[minor]) { | |
304 | ret = -ENODEV; | |
305 | goto unlock; | |
306 | } | |
86166b7b JK |
307 | |
308 | list_del(&list->node); | |
309 | dev = hidraw_table[minor]; | |
b8a832b1 | 310 | if (!--dev->open) { |
0361a28d | 311 | if (list->hidraw->exist) { |
5bea7660 DT |
312 | hid_hw_power(dev->hid, PM_HINT_NORMAL); |
313 | hid_hw_close(dev->hid); | |
0361a28d | 314 | } else { |
86166b7b | 315 | kfree(list->hidraw); |
0361a28d | 316 | } |
86166b7b | 317 | } |
4db1c62c | 318 | kfree(list); |
cb174681 JS |
319 | ret = 0; |
320 | unlock: | |
321 | mutex_unlock(&minors_lock); | |
4db1c62c | 322 | |
cb174681 | 323 | return ret; |
86166b7b JK |
324 | } |
325 | ||
979c407e AC |
326 | static long hidraw_ioctl(struct file *file, unsigned int cmd, |
327 | unsigned long arg) | |
86166b7b | 328 | { |
979c407e | 329 | struct inode *inode = file->f_path.dentry->d_inode; |
86166b7b | 330 | unsigned int minor = iminor(inode); |
979c407e | 331 | long ret = 0; |
2e57480b | 332 | struct hidraw *dev; |
86166b7b JK |
333 | void __user *user_arg = (void __user*) arg; |
334 | ||
2e57480b JK |
335 | mutex_lock(&minors_lock); |
336 | dev = hidraw_table[minor]; | |
d20d5ffa AO |
337 | if (!dev) { |
338 | ret = -ENODEV; | |
339 | goto out; | |
340 | } | |
2e57480b | 341 | |
86166b7b JK |
342 | switch (cmd) { |
343 | case HIDIOCGRDESCSIZE: | |
344 | if (put_user(dev->hid->rsize, (int __user *)arg)) | |
979c407e AC |
345 | ret = -EFAULT; |
346 | break; | |
86166b7b JK |
347 | |
348 | case HIDIOCGRDESC: | |
349 | { | |
350 | __u32 len; | |
351 | ||
352 | if (get_user(len, (int __user *)arg)) | |
979c407e AC |
353 | ret = -EFAULT; |
354 | else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) | |
355 | ret = -EINVAL; | |
356 | else if (copy_to_user(user_arg + offsetof( | |
357 | struct hidraw_report_descriptor, | |
358 | value[0]), | |
359 | dev->hid->rdesc, | |
360 | min(dev->hid->rsize, len))) | |
361 | ret = -EFAULT; | |
362 | break; | |
86166b7b JK |
363 | } |
364 | case HIDIOCGRAWINFO: | |
365 | { | |
366 | struct hidraw_devinfo dinfo; | |
367 | ||
368 | dinfo.bustype = dev->hid->bus; | |
369 | dinfo.vendor = dev->hid->vendor; | |
370 | dinfo.product = dev->hid->product; | |
371 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
979c407e AC |
372 | ret = -EFAULT; |
373 | break; | |
86166b7b JK |
374 | } |
375 | default: | |
9188e79e JK |
376 | { |
377 | struct hid_device *hid = dev->hid; | |
b4dbde9d AO |
378 | if (_IOC_TYPE(cmd) != 'H') { |
379 | ret = -EINVAL; | |
380 | break; | |
381 | } | |
382 | ||
383 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) { | |
384 | int len = _IOC_SIZE(cmd); | |
385 | ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT); | |
386 | break; | |
387 | } | |
388 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) { | |
389 | int len = _IOC_SIZE(cmd); | |
390 | ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT); | |
391 | break; | |
392 | } | |
393 | ||
394 | /* Begin Read-only ioctls. */ | |
395 | if (_IOC_DIR(cmd) != _IOC_READ) { | |
dfd395af DC |
396 | ret = -EINVAL; |
397 | break; | |
398 | } | |
9188e79e JK |
399 | |
400 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { | |
dd2ed487 | 401 | int len = strlen(hid->name) + 1; |
9188e79e JK |
402 | if (len > _IOC_SIZE(cmd)) |
403 | len = _IOC_SIZE(cmd); | |
dfd395af | 404 | ret = copy_to_user(user_arg, hid->name, len) ? |
9188e79e | 405 | -EFAULT : len; |
dfd395af | 406 | break; |
9188e79e JK |
407 | } |
408 | ||
409 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { | |
dd2ed487 | 410 | int len = strlen(hid->phys) + 1; |
9188e79e JK |
411 | if (len > _IOC_SIZE(cmd)) |
412 | len = _IOC_SIZE(cmd); | |
dfd395af | 413 | ret = copy_to_user(user_arg, hid->phys, len) ? |
9188e79e | 414 | -EFAULT : len; |
dfd395af | 415 | break; |
9188e79e | 416 | } |
b4dbde9d | 417 | } |
9188e79e | 418 | |
dfd395af | 419 | ret = -ENOTTY; |
86166b7b | 420 | } |
d20d5ffa | 421 | out: |
2e57480b | 422 | mutex_unlock(&minors_lock); |
979c407e | 423 | return ret; |
86166b7b JK |
424 | } |
425 | ||
426 | static const struct file_operations hidraw_ops = { | |
427 | .owner = THIS_MODULE, | |
428 | .read = hidraw_read, | |
429 | .write = hidraw_write, | |
430 | .poll = hidraw_poll, | |
431 | .open = hidraw_open, | |
432 | .release = hidraw_release, | |
979c407e | 433 | .unlocked_ioctl = hidraw_ioctl, |
ae5e49c7 AO |
434 | #ifdef CONFIG_COMPAT |
435 | .compat_ioctl = hidraw_ioctl, | |
436 | #endif | |
6038f373 | 437 | .llseek = noop_llseek, |
86166b7b JK |
438 | }; |
439 | ||
440 | void hidraw_report_event(struct hid_device *hid, u8 *data, int len) | |
441 | { | |
442 | struct hidraw *dev = hid->hidraw; | |
443 | struct hidraw_list *list; | |
444 | ||
445 | list_for_each_entry(list, &dev->list, node) { | |
446 | list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC); | |
447 | list->buffer[list->head].len = len; | |
448 | list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); | |
449 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
450 | } | |
451 | ||
452 | wake_up_interruptible(&dev->wait); | |
453 | } | |
454 | EXPORT_SYMBOL_GPL(hidraw_report_event); | |
455 | ||
456 | int hidraw_connect(struct hid_device *hid) | |
457 | { | |
709d27c0 | 458 | int minor, result; |
86166b7b JK |
459 | struct hidraw *dev; |
460 | ||
bbe281fa | 461 | /* we accept any HID device, no matter the applications */ |
86166b7b | 462 | |
709d27c0 MK |
463 | dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
464 | if (!dev) | |
465 | return -ENOMEM; | |
466 | ||
467 | result = -EINVAL; | |
86166b7b | 468 | |
7d672cd7 | 469 | mutex_lock(&minors_lock); |
86166b7b JK |
470 | |
471 | for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { | |
472 | if (hidraw_table[minor]) | |
473 | continue; | |
474 | hidraw_table[minor] = dev; | |
475 | result = 0; | |
476 | break; | |
477 | } | |
478 | ||
709d27c0 | 479 | if (result) { |
7d672cd7 | 480 | mutex_unlock(&minors_lock); |
709d27c0 | 481 | kfree(dev); |
86166b7b | 482 | goto out; |
709d27c0 | 483 | } |
86166b7b | 484 | |
aae6c286 | 485 | dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor), |
a9b12619 | 486 | NULL, "%s%d", "hidraw", minor); |
86166b7b JK |
487 | |
488 | if (IS_ERR(dev->dev)) { | |
86166b7b | 489 | hidraw_table[minor] = NULL; |
7d672cd7 | 490 | mutex_unlock(&minors_lock); |
86166b7b | 491 | result = PTR_ERR(dev->dev); |
709d27c0 | 492 | kfree(dev); |
86166b7b JK |
493 | goto out; |
494 | } | |
495 | ||
7d672cd7 | 496 | mutex_unlock(&minors_lock); |
86166b7b JK |
497 | init_waitqueue_head(&dev->wait); |
498 | INIT_LIST_HEAD(&dev->list); | |
499 | ||
500 | dev->hid = hid; | |
501 | dev->minor = minor; | |
502 | ||
503 | dev->exist = 1; | |
504 | hid->hidraw = dev; | |
505 | ||
506 | out: | |
507 | return result; | |
508 | ||
509 | } | |
510 | EXPORT_SYMBOL_GPL(hidraw_connect); | |
511 | ||
512 | void hidraw_disconnect(struct hid_device *hid) | |
513 | { | |
514 | struct hidraw *hidraw = hid->hidraw; | |
515 | ||
65b01bd5 | 516 | mutex_lock(&minors_lock); |
86166b7b JK |
517 | hidraw->exist = 0; |
518 | ||
3a22ebe9 SA |
519 | device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor)); |
520 | ||
86166b7b | 521 | hidraw_table[hidraw->minor] = NULL; |
86166b7b | 522 | |
86166b7b | 523 | if (hidraw->open) { |
5bea7660 | 524 | hid_hw_close(hid); |
86166b7b JK |
525 | wake_up_interruptible(&hidraw->wait); |
526 | } else { | |
527 | kfree(hidraw); | |
528 | } | |
65b01bd5 | 529 | mutex_unlock(&minors_lock); |
86166b7b JK |
530 | } |
531 | EXPORT_SYMBOL_GPL(hidraw_disconnect); | |
532 | ||
533 | int __init hidraw_init(void) | |
534 | { | |
535 | int result; | |
536 | dev_t dev_id; | |
537 | ||
538 | result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, | |
539 | HIDRAW_MAX_DEVICES, "hidraw"); | |
540 | ||
541 | hidraw_major = MAJOR(dev_id); | |
542 | ||
543 | if (result < 0) { | |
4291ee30 | 544 | pr_warn("can't get major number\n"); |
86166b7b JK |
545 | result = 0; |
546 | goto out; | |
547 | } | |
548 | ||
549 | hidraw_class = class_create(THIS_MODULE, "hidraw"); | |
550 | if (IS_ERR(hidraw_class)) { | |
551 | result = PTR_ERR(hidraw_class); | |
552 | unregister_chrdev(hidraw_major, "hidraw"); | |
553 | goto out; | |
554 | } | |
555 | ||
556 | cdev_init(&hidraw_cdev, &hidraw_ops); | |
557 | cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); | |
558 | out: | |
559 | return result; | |
560 | } | |
561 | ||
140ae3eb | 562 | void hidraw_exit(void) |
86166b7b JK |
563 | { |
564 | dev_t dev_id = MKDEV(hidraw_major, 0); | |
565 | ||
566 | cdev_del(&hidraw_cdev); | |
567 | class_destroy(hidraw_class); | |
568 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); | |
569 | ||
570 | } |