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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) { | |
86166b7b JK |
60 | if (signal_pending(current)) { |
61 | ret = -ERESTARTSYS; | |
62 | break; | |
63 | } | |
64 | if (!list->hidraw->exist) { | |
65 | ret = -EIO; | |
66 | break; | |
67 | } | |
7611e8d2 FF |
68 | if (file->f_flags & O_NONBLOCK) { |
69 | ret = -EAGAIN; | |
70 | break; | |
71 | } | |
86166b7b JK |
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 | ||
b6787242 JK |
90 | if (list->buffer[list->tail].value) { |
91 | if (copy_to_user(buffer, list->buffer[list->tail].value, len)) { | |
92 | ret = -EFAULT; | |
93 | goto out; | |
94 | } | |
95 | ret = len; | |
86166b7b | 96 | } |
86166b7b JK |
97 | |
98 | kfree(list->buffer[list->tail].value); | |
4c7b417e | 99 | list->buffer[list->tail].value = NULL; |
86166b7b JK |
100 | list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); |
101 | } | |
102 | out: | |
103 | mutex_unlock(&list->read_mutex); | |
104 | return ret; | |
105 | } | |
106 | ||
d2a1cfeb JK |
107 | /* The first byte is expected to be a report number. |
108 | * This function is to be called with the minors_lock mutex held */ | |
b4dbde9d | 109 | static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type) |
86166b7b | 110 | { |
496ad9aa | 111 | unsigned int minor = iminor(file_inode(file)); |
2e57480b | 112 | struct hid_device *dev; |
86166b7b JK |
113 | __u8 *buf; |
114 | int ret = 0; | |
115 | ||
df0cfd69 | 116 | if (!hidraw_table[minor]) { |
e42dee9a AO |
117 | ret = -ENODEV; |
118 | goto out; | |
119 | } | |
120 | ||
2e57480b JK |
121 | dev = hidraw_table[minor]->hid; |
122 | ||
123 | if (!dev->hid_output_raw_report) { | |
124 | ret = -ENODEV; | |
125 | goto out; | |
126 | } | |
86166b7b | 127 | |
2b107d62 | 128 | if (count > HID_MAX_BUFFER_SIZE) { |
4291ee30 JP |
129 | hid_warn(dev, "pid %d passed too large report\n", |
130 | task_pid_nr(current)); | |
2e57480b JK |
131 | ret = -EINVAL; |
132 | goto out; | |
86166b7b JK |
133 | } |
134 | ||
135 | if (count < 2) { | |
4291ee30 JP |
136 | hid_warn(dev, "pid %d passed too short report\n", |
137 | task_pid_nr(current)); | |
2e57480b JK |
138 | ret = -EINVAL; |
139 | goto out; | |
86166b7b JK |
140 | } |
141 | ||
142 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); | |
2e57480b JK |
143 | if (!buf) { |
144 | ret = -ENOMEM; | |
145 | goto out; | |
146 | } | |
86166b7b JK |
147 | |
148 | if (copy_from_user(buf, buffer, count)) { | |
149 | ret = -EFAULT; | |
2e57480b | 150 | goto out_free; |
86166b7b JK |
151 | } |
152 | ||
b4dbde9d | 153 | ret = dev->hid_output_raw_report(dev, buf, count, report_type); |
2e57480b | 154 | out_free: |
86166b7b | 155 | kfree(buf); |
2e57480b | 156 | out: |
b4dbde9d AO |
157 | return ret; |
158 | } | |
159 | ||
160 | /* the first byte is expected to be a report number */ | |
161 | static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
162 | { | |
163 | ssize_t ret; | |
164 | mutex_lock(&minors_lock); | |
165 | ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT); | |
2e57480b | 166 | mutex_unlock(&minors_lock); |
86166b7b JK |
167 | return ret; |
168 | } | |
169 | ||
b4dbde9d AO |
170 | |
171 | /* This function performs a Get_Report transfer over the control endpoint | |
d2a1cfeb JK |
172 | * per section 7.2.1 of the HID specification, version 1.1. The first byte |
173 | * of buffer is the report number to request, or 0x0 if the defice does not | |
174 | * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT | |
175 | * or HID_INPUT_REPORT. This function is to be called with the minors_lock | |
176 | * mutex held. */ | |
b4dbde9d AO |
177 | static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type) |
178 | { | |
496ad9aa | 179 | unsigned int minor = iminor(file_inode(file)); |
b4dbde9d AO |
180 | struct hid_device *dev; |
181 | __u8 *buf; | |
182 | int ret = 0, len; | |
183 | unsigned char report_number; | |
184 | ||
185 | dev = hidraw_table[minor]->hid; | |
186 | ||
187 | if (!dev->hid_get_raw_report) { | |
188 | ret = -ENODEV; | |
189 | goto out; | |
190 | } | |
191 | ||
192 | if (count > HID_MAX_BUFFER_SIZE) { | |
193 | printk(KERN_WARNING "hidraw: pid %d passed too large report\n", | |
194 | task_pid_nr(current)); | |
195 | ret = -EINVAL; | |
196 | goto out; | |
197 | } | |
198 | ||
199 | if (count < 2) { | |
200 | printk(KERN_WARNING "hidraw: pid %d passed too short report\n", | |
201 | task_pid_nr(current)); | |
202 | ret = -EINVAL; | |
203 | goto out; | |
204 | } | |
205 | ||
206 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); | |
207 | if (!buf) { | |
208 | ret = -ENOMEM; | |
209 | goto out; | |
210 | } | |
211 | ||
212 | /* Read the first byte from the user. This is the report number, | |
d2a1cfeb | 213 | * which is passed to dev->hid_get_raw_report(). */ |
b4dbde9d AO |
214 | if (copy_from_user(&report_number, buffer, 1)) { |
215 | ret = -EFAULT; | |
216 | goto out_free; | |
217 | } | |
218 | ||
219 | ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type); | |
220 | ||
221 | if (ret < 0) | |
222 | goto out_free; | |
223 | ||
224 | len = (ret < count) ? ret : count; | |
225 | ||
226 | if (copy_to_user(buffer, buf, len)) { | |
227 | ret = -EFAULT; | |
228 | goto out_free; | |
229 | } | |
230 | ||
231 | ret = len; | |
232 | ||
233 | out_free: | |
234 | kfree(buf); | |
235 | out: | |
236 | return ret; | |
237 | } | |
238 | ||
86166b7b JK |
239 | static unsigned int hidraw_poll(struct file *file, poll_table *wait) |
240 | { | |
241 | struct hidraw_list *list = file->private_data; | |
242 | ||
243 | poll_wait(file, &list->hidraw->wait, wait); | |
244 | if (list->head != list->tail) | |
245 | return POLLIN | POLLRDNORM; | |
246 | if (!list->hidraw->exist) | |
247 | return POLLERR | POLLHUP; | |
248 | return 0; | |
249 | } | |
250 | ||
251 | static int hidraw_open(struct inode *inode, struct file *file) | |
252 | { | |
253 | unsigned int minor = iminor(inode); | |
254 | struct hidraw *dev; | |
255 | struct hidraw_list *list; | |
256 | int err = 0; | |
257 | ||
258 | if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { | |
259 | err = -ENOMEM; | |
260 | goto out; | |
261 | } | |
262 | ||
7d672cd7 | 263 | mutex_lock(&minors_lock); |
df0cfd69 | 264 | if (!hidraw_table[minor]) { |
86166b7b JK |
265 | err = -ENODEV; |
266 | goto out_unlock; | |
267 | } | |
268 | ||
269 | list->hidraw = hidraw_table[minor]; | |
270 | mutex_init(&list->read_mutex); | |
271 | list_add_tail(&list->node, &hidraw_table[minor]->list); | |
272 | file->private_data = list; | |
273 | ||
274 | dev = hidraw_table[minor]; | |
7d672cd7 | 275 | if (!dev->open++) { |
5bea7660 | 276 | err = hid_hw_power(dev->hid, PM_HINT_FULLON); |
f554ff80 AN |
277 | if (err < 0) { |
278 | dev->open--; | |
5bea7660 | 279 | goto out_unlock; |
f554ff80 | 280 | } |
5bea7660 DT |
281 | |
282 | err = hid_hw_open(dev->hid); | |
0361a28d | 283 | if (err < 0) { |
5bea7660 | 284 | hid_hw_power(dev->hid, PM_HINT_NORMAL); |
7d672cd7 | 285 | dev->open--; |
0361a28d | 286 | } |
7d672cd7 | 287 | } |
86166b7b JK |
288 | |
289 | out_unlock: | |
7d672cd7 | 290 | mutex_unlock(&minors_lock); |
7d672cd7 | 291 | out: |
1a896231 AN |
292 | if (err < 0) |
293 | kfree(list); | |
86166b7b JK |
294 | return err; |
295 | ||
296 | } | |
297 | ||
b5531318 AD |
298 | static int hidraw_fasync(int fd, struct file *file, int on) |
299 | { | |
300 | struct hidraw_list *list = file->private_data; | |
301 | ||
302 | return fasync_helper(fd, file, on, &list->fasync); | |
303 | } | |
304 | ||
86166b7b JK |
305 | static int hidraw_release(struct inode * inode, struct file * file) |
306 | { | |
307 | unsigned int minor = iminor(inode); | |
df0cfd69 | 308 | struct hidraw *dev; |
86166b7b | 309 | struct hidraw_list *list = file->private_data; |
df0cfd69 JK |
310 | int ret; |
311 | int i; | |
312 | ||
313 | mutex_lock(&minors_lock); | |
314 | if (!hidraw_table[minor]) { | |
315 | ret = -ENODEV; | |
316 | goto unlock; | |
317 | } | |
86166b7b JK |
318 | |
319 | list_del(&list->node); | |
df0cfd69 JK |
320 | dev = hidraw_table[minor]; |
321 | if (!--dev->open) { | |
322 | if (list->hidraw->exist) { | |
323 | hid_hw_power(dev->hid, PM_HINT_NORMAL); | |
324 | hid_hw_close(dev->hid); | |
325 | } else { | |
326 | kfree(list->hidraw); | |
327 | } | |
328 | } | |
329 | ||
330 | for (i = 0; i < HIDRAW_BUFFER_SIZE; ++i) | |
331 | kfree(list->buffer[i].value); | |
4db1c62c | 332 | kfree(list); |
df0cfd69 JK |
333 | ret = 0; |
334 | unlock: | |
335 | mutex_unlock(&minors_lock); | |
336 | ||
337 | return ret; | |
86166b7b JK |
338 | } |
339 | ||
979c407e AC |
340 | static long hidraw_ioctl(struct file *file, unsigned int cmd, |
341 | unsigned long arg) | |
86166b7b | 342 | { |
496ad9aa | 343 | struct inode *inode = file_inode(file); |
86166b7b | 344 | unsigned int minor = iminor(inode); |
979c407e | 345 | long ret = 0; |
2e57480b | 346 | struct hidraw *dev; |
86166b7b JK |
347 | void __user *user_arg = (void __user*) arg; |
348 | ||
2e57480b JK |
349 | mutex_lock(&minors_lock); |
350 | dev = hidraw_table[minor]; | |
d20d5ffa AO |
351 | if (!dev) { |
352 | ret = -ENODEV; | |
353 | goto out; | |
354 | } | |
2e57480b | 355 | |
86166b7b JK |
356 | switch (cmd) { |
357 | case HIDIOCGRDESCSIZE: | |
358 | if (put_user(dev->hid->rsize, (int __user *)arg)) | |
979c407e AC |
359 | ret = -EFAULT; |
360 | break; | |
86166b7b JK |
361 | |
362 | case HIDIOCGRDESC: | |
363 | { | |
364 | __u32 len; | |
365 | ||
366 | if (get_user(len, (int __user *)arg)) | |
979c407e AC |
367 | ret = -EFAULT; |
368 | else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) | |
369 | ret = -EINVAL; | |
370 | else if (copy_to_user(user_arg + offsetof( | |
371 | struct hidraw_report_descriptor, | |
372 | value[0]), | |
373 | dev->hid->rdesc, | |
374 | min(dev->hid->rsize, len))) | |
375 | ret = -EFAULT; | |
376 | break; | |
86166b7b JK |
377 | } |
378 | case HIDIOCGRAWINFO: | |
379 | { | |
380 | struct hidraw_devinfo dinfo; | |
381 | ||
382 | dinfo.bustype = dev->hid->bus; | |
383 | dinfo.vendor = dev->hid->vendor; | |
384 | dinfo.product = dev->hid->product; | |
385 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
979c407e AC |
386 | ret = -EFAULT; |
387 | break; | |
86166b7b JK |
388 | } |
389 | default: | |
9188e79e JK |
390 | { |
391 | struct hid_device *hid = dev->hid; | |
b4dbde9d AO |
392 | if (_IOC_TYPE(cmd) != 'H') { |
393 | ret = -EINVAL; | |
394 | break; | |
395 | } | |
396 | ||
397 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) { | |
398 | int len = _IOC_SIZE(cmd); | |
399 | ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT); | |
400 | break; | |
401 | } | |
402 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) { | |
403 | int len = _IOC_SIZE(cmd); | |
404 | ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT); | |
405 | break; | |
406 | } | |
407 | ||
408 | /* Begin Read-only ioctls. */ | |
409 | if (_IOC_DIR(cmd) != _IOC_READ) { | |
dfd395af DC |
410 | ret = -EINVAL; |
411 | break; | |
412 | } | |
9188e79e JK |
413 | |
414 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { | |
dd2ed487 | 415 | int len = strlen(hid->name) + 1; |
9188e79e JK |
416 | if (len > _IOC_SIZE(cmd)) |
417 | len = _IOC_SIZE(cmd); | |
dfd395af | 418 | ret = copy_to_user(user_arg, hid->name, len) ? |
9188e79e | 419 | -EFAULT : len; |
dfd395af | 420 | break; |
9188e79e JK |
421 | } |
422 | ||
423 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { | |
dd2ed487 | 424 | int len = strlen(hid->phys) + 1; |
9188e79e JK |
425 | if (len > _IOC_SIZE(cmd)) |
426 | len = _IOC_SIZE(cmd); | |
dfd395af | 427 | ret = copy_to_user(user_arg, hid->phys, len) ? |
9188e79e | 428 | -EFAULT : len; |
dfd395af | 429 | break; |
9188e79e | 430 | } |
b4dbde9d | 431 | } |
9188e79e | 432 | |
dfd395af | 433 | ret = -ENOTTY; |
86166b7b | 434 | } |
d20d5ffa | 435 | out: |
2e57480b | 436 | mutex_unlock(&minors_lock); |
979c407e | 437 | return ret; |
86166b7b JK |
438 | } |
439 | ||
440 | static const struct file_operations hidraw_ops = { | |
441 | .owner = THIS_MODULE, | |
442 | .read = hidraw_read, | |
443 | .write = hidraw_write, | |
444 | .poll = hidraw_poll, | |
445 | .open = hidraw_open, | |
446 | .release = hidraw_release, | |
979c407e | 447 | .unlocked_ioctl = hidraw_ioctl, |
b5531318 | 448 | .fasync = hidraw_fasync, |
ae5e49c7 AO |
449 | #ifdef CONFIG_COMPAT |
450 | .compat_ioctl = hidraw_ioctl, | |
451 | #endif | |
6038f373 | 452 | .llseek = noop_llseek, |
86166b7b JK |
453 | }; |
454 | ||
b6787242 | 455 | int hidraw_report_event(struct hid_device *hid, u8 *data, int len) |
86166b7b JK |
456 | { |
457 | struct hidraw *dev = hid->hidraw; | |
458 | struct hidraw_list *list; | |
b6787242 | 459 | int ret = 0; |
86166b7b JK |
460 | |
461 | list_for_each_entry(list, &dev->list, node) { | |
4c7b417e MC |
462 | int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); |
463 | ||
464 | if (new_head == list->tail) | |
465 | continue; | |
466 | ||
b6787242 JK |
467 | if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) { |
468 | ret = -ENOMEM; | |
469 | break; | |
470 | } | |
86166b7b | 471 | list->buffer[list->head].len = len; |
4c7b417e | 472 | list->head = new_head; |
86166b7b JK |
473 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
474 | } | |
475 | ||
476 | wake_up_interruptible(&dev->wait); | |
b6787242 | 477 | return ret; |
86166b7b JK |
478 | } |
479 | EXPORT_SYMBOL_GPL(hidraw_report_event); | |
480 | ||
481 | int hidraw_connect(struct hid_device *hid) | |
482 | { | |
709d27c0 | 483 | int minor, result; |
86166b7b JK |
484 | struct hidraw *dev; |
485 | ||
bbe281fa | 486 | /* we accept any HID device, no matter the applications */ |
86166b7b | 487 | |
709d27c0 MK |
488 | dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
489 | if (!dev) | |
490 | return -ENOMEM; | |
491 | ||
492 | result = -EINVAL; | |
86166b7b | 493 | |
7d672cd7 | 494 | mutex_lock(&minors_lock); |
86166b7b JK |
495 | |
496 | for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { | |
497 | if (hidraw_table[minor]) | |
498 | continue; | |
499 | hidraw_table[minor] = dev; | |
500 | result = 0; | |
501 | break; | |
502 | } | |
503 | ||
709d27c0 | 504 | if (result) { |
7d672cd7 | 505 | mutex_unlock(&minors_lock); |
709d27c0 | 506 | kfree(dev); |
86166b7b | 507 | goto out; |
709d27c0 | 508 | } |
86166b7b | 509 | |
aae6c286 | 510 | dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor), |
a9b12619 | 511 | NULL, "%s%d", "hidraw", minor); |
86166b7b JK |
512 | |
513 | if (IS_ERR(dev->dev)) { | |
86166b7b | 514 | hidraw_table[minor] = NULL; |
7d672cd7 | 515 | mutex_unlock(&minors_lock); |
86166b7b | 516 | result = PTR_ERR(dev->dev); |
709d27c0 | 517 | kfree(dev); |
86166b7b JK |
518 | goto out; |
519 | } | |
520 | ||
7d672cd7 | 521 | mutex_unlock(&minors_lock); |
86166b7b JK |
522 | init_waitqueue_head(&dev->wait); |
523 | INIT_LIST_HEAD(&dev->list); | |
524 | ||
525 | dev->hid = hid; | |
526 | dev->minor = minor; | |
527 | ||
528 | dev->exist = 1; | |
529 | hid->hidraw = dev; | |
530 | ||
531 | out: | |
532 | return result; | |
533 | ||
534 | } | |
535 | EXPORT_SYMBOL_GPL(hidraw_connect); | |
536 | ||
537 | void hidraw_disconnect(struct hid_device *hid) | |
538 | { | |
539 | struct hidraw *hidraw = hid->hidraw; | |
df0cfd69 JK |
540 | |
541 | mutex_lock(&minors_lock); | |
542 | hidraw->exist = 0; | |
543 | ||
544 | device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor)); | |
545 | ||
546 | hidraw_table[hidraw->minor] = NULL; | |
547 | ||
548 | if (hidraw->open) { | |
549 | hid_hw_close(hid); | |
550 | wake_up_interruptible(&hidraw->wait); | |
551 | } else { | |
552 | kfree(hidraw); | |
553 | } | |
554 | mutex_unlock(&minors_lock); | |
86166b7b JK |
555 | } |
556 | EXPORT_SYMBOL_GPL(hidraw_disconnect); | |
557 | ||
558 | int __init hidraw_init(void) | |
559 | { | |
560 | int result; | |
561 | dev_t dev_id; | |
562 | ||
563 | result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, | |
564 | HIDRAW_MAX_DEVICES, "hidraw"); | |
565 | ||
566 | hidraw_major = MAJOR(dev_id); | |
567 | ||
568 | if (result < 0) { | |
4291ee30 | 569 | pr_warn("can't get major number\n"); |
86166b7b JK |
570 | goto out; |
571 | } | |
572 | ||
573 | hidraw_class = class_create(THIS_MODULE, "hidraw"); | |
574 | if (IS_ERR(hidraw_class)) { | |
575 | result = PTR_ERR(hidraw_class); | |
bcb4a75b | 576 | goto error_cdev; |
86166b7b JK |
577 | } |
578 | ||
579 | cdev_init(&hidraw_cdev, &hidraw_ops); | |
bcb4a75b AK |
580 | result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); |
581 | if (result < 0) | |
582 | goto error_class; | |
583 | ||
0f690ccf | 584 | printk(KERN_INFO "hidraw: raw HID events driver (C) Jiri Kosina\n"); |
86166b7b JK |
585 | out: |
586 | return result; | |
bcb4a75b AK |
587 | |
588 | error_class: | |
589 | class_destroy(hidraw_class); | |
590 | error_cdev: | |
591 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); | |
592 | goto out; | |
86166b7b JK |
593 | } |
594 | ||
140ae3eb | 595 | void hidraw_exit(void) |
86166b7b JK |
596 | { |
597 | dev_t dev_id = MKDEV(hidraw_major, 0); | |
598 | ||
599 | cdev_del(&hidraw_cdev); | |
600 | class_destroy(hidraw_class); | |
601 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); | |
602 | ||
603 | } |