Commit | Line | Data |
---|---|---|
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 | * | |
61834535 | 9 | * Copyright (c) 2007-2014 Jiri Kosina |
86166b7b JK |
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 | ||
61834535 JK |
107 | /* |
108 | * The first byte of the report buffer is expected to be a report number. | |
109 | * | |
110 | * This function is to be called with the minors_lock mutex held. | |
111 | */ | |
b4dbde9d | 112 | static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type) |
86166b7b | 113 | { |
496ad9aa | 114 | unsigned int minor = iminor(file_inode(file)); |
2e57480b | 115 | struct hid_device *dev; |
86166b7b JK |
116 | __u8 *buf; |
117 | int ret = 0; | |
118 | ||
212a871a | 119 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
e42dee9a AO |
120 | ret = -ENODEV; |
121 | goto out; | |
122 | } | |
123 | ||
2e57480b JK |
124 | dev = hidraw_table[minor]->hid; |
125 | ||
126 | if (!dev->hid_output_raw_report) { | |
127 | ret = -ENODEV; | |
128 | goto out; | |
129 | } | |
86166b7b | 130 | |
2b107d62 | 131 | if (count > HID_MAX_BUFFER_SIZE) { |
4291ee30 JP |
132 | hid_warn(dev, "pid %d passed too large report\n", |
133 | task_pid_nr(current)); | |
2e57480b JK |
134 | ret = -EINVAL; |
135 | goto out; | |
86166b7b JK |
136 | } |
137 | ||
138 | if (count < 2) { | |
4291ee30 JP |
139 | hid_warn(dev, "pid %d passed too short report\n", |
140 | task_pid_nr(current)); | |
2e57480b JK |
141 | ret = -EINVAL; |
142 | goto out; | |
86166b7b JK |
143 | } |
144 | ||
145 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); | |
2e57480b JK |
146 | if (!buf) { |
147 | ret = -ENOMEM; | |
148 | goto out; | |
149 | } | |
86166b7b JK |
150 | |
151 | if (copy_from_user(buf, buffer, count)) { | |
152 | ret = -EFAULT; | |
2e57480b | 153 | goto out_free; |
86166b7b JK |
154 | } |
155 | ||
b4dbde9d | 156 | ret = dev->hid_output_raw_report(dev, buf, count, report_type); |
2e57480b | 157 | out_free: |
86166b7b | 158 | kfree(buf); |
2e57480b | 159 | out: |
b4dbde9d AO |
160 | return ret; |
161 | } | |
162 | ||
b4dbde9d AO |
163 | static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
164 | { | |
165 | ssize_t ret; | |
166 | mutex_lock(&minors_lock); | |
167 | ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT); | |
2e57480b | 168 | mutex_unlock(&minors_lock); |
86166b7b JK |
169 | return ret; |
170 | } | |
171 | ||
b4dbde9d | 172 | |
61834535 JK |
173 | /* |
174 | * This function performs a Get_Report transfer over the control endpoint | |
d2a1cfeb JK |
175 | * per section 7.2.1 of the HID specification, version 1.1. The first byte |
176 | * of buffer is the report number to request, or 0x0 if the defice does not | |
177 | * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT | |
61834535 JK |
178 | * or HID_INPUT_REPORT. |
179 | * | |
180 | * This function is to be called with the minors_lock mutex held. | |
181 | */ | |
b4dbde9d AO |
182 | static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type) |
183 | { | |
496ad9aa | 184 | unsigned int minor = iminor(file_inode(file)); |
b4dbde9d AO |
185 | struct hid_device *dev; |
186 | __u8 *buf; | |
187 | int ret = 0, len; | |
188 | unsigned char report_number; | |
189 | ||
190 | dev = hidraw_table[minor]->hid; | |
191 | ||
192 | if (!dev->hid_get_raw_report) { | |
193 | ret = -ENODEV; | |
194 | goto out; | |
195 | } | |
196 | ||
197 | if (count > HID_MAX_BUFFER_SIZE) { | |
198 | printk(KERN_WARNING "hidraw: pid %d passed too large report\n", | |
199 | task_pid_nr(current)); | |
200 | ret = -EINVAL; | |
201 | goto out; | |
202 | } | |
203 | ||
204 | if (count < 2) { | |
205 | printk(KERN_WARNING "hidraw: pid %d passed too short report\n", | |
206 | task_pid_nr(current)); | |
207 | ret = -EINVAL; | |
208 | goto out; | |
209 | } | |
210 | ||
211 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); | |
212 | if (!buf) { | |
213 | ret = -ENOMEM; | |
214 | goto out; | |
215 | } | |
216 | ||
61834535 JK |
217 | /* |
218 | * Read the first byte from the user. This is the report number, | |
219 | * which is passed to dev->hid_get_raw_report(). | |
220 | */ | |
b4dbde9d AO |
221 | if (copy_from_user(&report_number, buffer, 1)) { |
222 | ret = -EFAULT; | |
223 | goto out_free; | |
224 | } | |
225 | ||
226 | ret = dev->hid_get_raw_report(dev, report_number, buf, count, report_type); | |
227 | ||
228 | if (ret < 0) | |
229 | goto out_free; | |
230 | ||
231 | len = (ret < count) ? ret : count; | |
232 | ||
233 | if (copy_to_user(buffer, buf, len)) { | |
234 | ret = -EFAULT; | |
235 | goto out_free; | |
236 | } | |
237 | ||
238 | ret = len; | |
239 | ||
240 | out_free: | |
241 | kfree(buf); | |
242 | out: | |
243 | return ret; | |
244 | } | |
245 | ||
86166b7b JK |
246 | static unsigned int hidraw_poll(struct file *file, poll_table *wait) |
247 | { | |
248 | struct hidraw_list *list = file->private_data; | |
249 | ||
250 | poll_wait(file, &list->hidraw->wait, wait); | |
251 | if (list->head != list->tail) | |
252 | return POLLIN | POLLRDNORM; | |
253 | if (!list->hidraw->exist) | |
254 | return POLLERR | POLLHUP; | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static int hidraw_open(struct inode *inode, struct file *file) | |
259 | { | |
260 | unsigned int minor = iminor(inode); | |
261 | struct hidraw *dev; | |
262 | struct hidraw_list *list; | |
277fe44d | 263 | unsigned long flags; |
86166b7b JK |
264 | int err = 0; |
265 | ||
266 | if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { | |
267 | err = -ENOMEM; | |
268 | goto out; | |
269 | } | |
270 | ||
7d672cd7 | 271 | mutex_lock(&minors_lock); |
212a871a | 272 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
86166b7b JK |
273 | err = -ENODEV; |
274 | goto out_unlock; | |
275 | } | |
276 | ||
86166b7b | 277 | dev = hidraw_table[minor]; |
7d672cd7 | 278 | if (!dev->open++) { |
5bea7660 | 279 | err = hid_hw_power(dev->hid, PM_HINT_FULLON); |
f554ff80 AN |
280 | if (err < 0) { |
281 | dev->open--; | |
5bea7660 | 282 | goto out_unlock; |
f554ff80 | 283 | } |
5bea7660 DT |
284 | |
285 | err = hid_hw_open(dev->hid); | |
0361a28d | 286 | if (err < 0) { |
5bea7660 | 287 | hid_hw_power(dev->hid, PM_HINT_NORMAL); |
7d672cd7 | 288 | dev->open--; |
277fe44d | 289 | goto out_unlock; |
0361a28d | 290 | } |
7d672cd7 | 291 | } |
86166b7b | 292 | |
277fe44d YZ |
293 | list->hidraw = hidraw_table[minor]; |
294 | mutex_init(&list->read_mutex); | |
295 | spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); | |
296 | list_add_tail(&list->node, &hidraw_table[minor]->list); | |
297 | spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); | |
298 | file->private_data = list; | |
86166b7b | 299 | out_unlock: |
7d672cd7 | 300 | mutex_unlock(&minors_lock); |
7d672cd7 | 301 | out: |
1a896231 AN |
302 | if (err < 0) |
303 | kfree(list); | |
86166b7b JK |
304 | return err; |
305 | ||
306 | } | |
307 | ||
b5531318 AD |
308 | static int hidraw_fasync(int fd, struct file *file, int on) |
309 | { | |
310 | struct hidraw_list *list = file->private_data; | |
311 | ||
312 | return fasync_helper(fd, file, on, &list->fasync); | |
313 | } | |
314 | ||
212a871a MC |
315 | static void drop_ref(struct hidraw *hidraw, int exists_bit) |
316 | { | |
317 | if (exists_bit) { | |
212a871a | 318 | hidraw->exist = 0; |
0f5a24c6 MC |
319 | if (hidraw->open) { |
320 | hid_hw_close(hidraw->hid); | |
212a871a | 321 | wake_up_interruptible(&hidraw->wait); |
0f5a24c6 | 322 | } |
47587fc0 FLVC |
323 | device_destroy(hidraw_class, |
324 | MKDEV(hidraw_major, hidraw->minor)); | |
212a871a MC |
325 | } else { |
326 | --hidraw->open; | |
327 | } | |
0f5a24c6 MC |
328 | if (!hidraw->open) { |
329 | if (!hidraw->exist) { | |
0f5a24c6 MC |
330 | hidraw_table[hidraw->minor] = NULL; |
331 | kfree(hidraw); | |
332 | } else { | |
333 | /* close device for last reader */ | |
334 | hid_hw_power(hidraw->hid, PM_HINT_NORMAL); | |
335 | hid_hw_close(hidraw->hid); | |
336 | } | |
212a871a MC |
337 | } |
338 | } | |
339 | ||
86166b7b JK |
340 | static int hidraw_release(struct inode * inode, struct file * file) |
341 | { | |
342 | unsigned int minor = iminor(inode); | |
86166b7b | 343 | struct hidraw_list *list = file->private_data; |
277fe44d | 344 | unsigned long flags; |
df0cfd69 JK |
345 | |
346 | mutex_lock(&minors_lock); | |
86166b7b | 347 | |
277fe44d | 348 | spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); |
86166b7b | 349 | list_del(&list->node); |
277fe44d | 350 | spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); |
4db1c62c | 351 | kfree(list); |
df0cfd69 | 352 | |
212a871a MC |
353 | drop_ref(hidraw_table[minor], 0); |
354 | ||
355 | mutex_unlock(&minors_lock); | |
356 | return 0; | |
86166b7b JK |
357 | } |
358 | ||
979c407e AC |
359 | static long hidraw_ioctl(struct file *file, unsigned int cmd, |
360 | unsigned long arg) | |
86166b7b | 361 | { |
496ad9aa | 362 | struct inode *inode = file_inode(file); |
86166b7b | 363 | unsigned int minor = iminor(inode); |
979c407e | 364 | long ret = 0; |
2e57480b | 365 | struct hidraw *dev; |
86166b7b JK |
366 | void __user *user_arg = (void __user*) arg; |
367 | ||
2e57480b JK |
368 | mutex_lock(&minors_lock); |
369 | dev = hidraw_table[minor]; | |
d20d5ffa AO |
370 | if (!dev) { |
371 | ret = -ENODEV; | |
372 | goto out; | |
373 | } | |
2e57480b | 374 | |
86166b7b JK |
375 | switch (cmd) { |
376 | case HIDIOCGRDESCSIZE: | |
377 | if (put_user(dev->hid->rsize, (int __user *)arg)) | |
979c407e AC |
378 | ret = -EFAULT; |
379 | break; | |
86166b7b JK |
380 | |
381 | case HIDIOCGRDESC: | |
382 | { | |
383 | __u32 len; | |
384 | ||
385 | if (get_user(len, (int __user *)arg)) | |
979c407e AC |
386 | ret = -EFAULT; |
387 | else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) | |
388 | ret = -EINVAL; | |
389 | else if (copy_to_user(user_arg + offsetof( | |
390 | struct hidraw_report_descriptor, | |
391 | value[0]), | |
392 | dev->hid->rdesc, | |
393 | min(dev->hid->rsize, len))) | |
394 | ret = -EFAULT; | |
395 | break; | |
86166b7b JK |
396 | } |
397 | case HIDIOCGRAWINFO: | |
398 | { | |
399 | struct hidraw_devinfo dinfo; | |
400 | ||
401 | dinfo.bustype = dev->hid->bus; | |
402 | dinfo.vendor = dev->hid->vendor; | |
403 | dinfo.product = dev->hid->product; | |
404 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
979c407e AC |
405 | ret = -EFAULT; |
406 | break; | |
86166b7b JK |
407 | } |
408 | default: | |
9188e79e JK |
409 | { |
410 | struct hid_device *hid = dev->hid; | |
b4dbde9d AO |
411 | if (_IOC_TYPE(cmd) != 'H') { |
412 | ret = -EINVAL; | |
413 | break; | |
414 | } | |
415 | ||
416 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) { | |
417 | int len = _IOC_SIZE(cmd); | |
418 | ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT); | |
419 | break; | |
420 | } | |
421 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) { | |
422 | int len = _IOC_SIZE(cmd); | |
423 | ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT); | |
424 | break; | |
425 | } | |
426 | ||
427 | /* Begin Read-only ioctls. */ | |
428 | if (_IOC_DIR(cmd) != _IOC_READ) { | |
dfd395af DC |
429 | ret = -EINVAL; |
430 | break; | |
431 | } | |
9188e79e JK |
432 | |
433 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { | |
dd2ed487 | 434 | int len = strlen(hid->name) + 1; |
9188e79e JK |
435 | if (len > _IOC_SIZE(cmd)) |
436 | len = _IOC_SIZE(cmd); | |
dfd395af | 437 | ret = copy_to_user(user_arg, hid->name, len) ? |
9188e79e | 438 | -EFAULT : len; |
dfd395af | 439 | break; |
9188e79e JK |
440 | } |
441 | ||
442 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { | |
dd2ed487 | 443 | int len = strlen(hid->phys) + 1; |
9188e79e JK |
444 | if (len > _IOC_SIZE(cmd)) |
445 | len = _IOC_SIZE(cmd); | |
dfd395af | 446 | ret = copy_to_user(user_arg, hid->phys, len) ? |
9188e79e | 447 | -EFAULT : len; |
dfd395af | 448 | break; |
9188e79e | 449 | } |
b4dbde9d | 450 | } |
9188e79e | 451 | |
dfd395af | 452 | ret = -ENOTTY; |
86166b7b | 453 | } |
d20d5ffa | 454 | out: |
2e57480b | 455 | mutex_unlock(&minors_lock); |
979c407e | 456 | return ret; |
86166b7b JK |
457 | } |
458 | ||
459 | static const struct file_operations hidraw_ops = { | |
460 | .owner = THIS_MODULE, | |
461 | .read = hidraw_read, | |
462 | .write = hidraw_write, | |
463 | .poll = hidraw_poll, | |
464 | .open = hidraw_open, | |
465 | .release = hidraw_release, | |
979c407e | 466 | .unlocked_ioctl = hidraw_ioctl, |
b5531318 | 467 | .fasync = hidraw_fasync, |
ae5e49c7 AO |
468 | #ifdef CONFIG_COMPAT |
469 | .compat_ioctl = hidraw_ioctl, | |
470 | #endif | |
6038f373 | 471 | .llseek = noop_llseek, |
86166b7b JK |
472 | }; |
473 | ||
b6787242 | 474 | int hidraw_report_event(struct hid_device *hid, u8 *data, int len) |
86166b7b JK |
475 | { |
476 | struct hidraw *dev = hid->hidraw; | |
477 | struct hidraw_list *list; | |
b6787242 | 478 | int ret = 0; |
277fe44d | 479 | unsigned long flags; |
86166b7b | 480 | |
277fe44d | 481 | spin_lock_irqsave(&dev->list_lock, flags); |
86166b7b | 482 | list_for_each_entry(list, &dev->list, node) { |
4c7b417e MC |
483 | int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); |
484 | ||
485 | if (new_head == list->tail) | |
486 | continue; | |
487 | ||
b6787242 JK |
488 | if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) { |
489 | ret = -ENOMEM; | |
490 | break; | |
491 | } | |
86166b7b | 492 | list->buffer[list->head].len = len; |
4c7b417e | 493 | list->head = new_head; |
86166b7b JK |
494 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
495 | } | |
277fe44d | 496 | spin_unlock_irqrestore(&dev->list_lock, flags); |
86166b7b JK |
497 | |
498 | wake_up_interruptible(&dev->wait); | |
b6787242 | 499 | return ret; |
86166b7b JK |
500 | } |
501 | EXPORT_SYMBOL_GPL(hidraw_report_event); | |
502 | ||
503 | int hidraw_connect(struct hid_device *hid) | |
504 | { | |
709d27c0 | 505 | int minor, result; |
86166b7b JK |
506 | struct hidraw *dev; |
507 | ||
61834535 | 508 | /* we accept any HID device, all applications */ |
86166b7b | 509 | |
709d27c0 MK |
510 | dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
511 | if (!dev) | |
512 | return -ENOMEM; | |
513 | ||
514 | result = -EINVAL; | |
86166b7b | 515 | |
7d672cd7 | 516 | mutex_lock(&minors_lock); |
86166b7b JK |
517 | |
518 | for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { | |
519 | if (hidraw_table[minor]) | |
520 | continue; | |
521 | hidraw_table[minor] = dev; | |
522 | result = 0; | |
523 | break; | |
524 | } | |
525 | ||
709d27c0 | 526 | if (result) { |
7d672cd7 | 527 | mutex_unlock(&minors_lock); |
709d27c0 | 528 | kfree(dev); |
86166b7b | 529 | goto out; |
709d27c0 | 530 | } |
86166b7b | 531 | |
aae6c286 | 532 | dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor), |
a9b12619 | 533 | NULL, "%s%d", "hidraw", minor); |
86166b7b JK |
534 | |
535 | if (IS_ERR(dev->dev)) { | |
86166b7b | 536 | hidraw_table[minor] = NULL; |
7d672cd7 | 537 | mutex_unlock(&minors_lock); |
86166b7b | 538 | result = PTR_ERR(dev->dev); |
709d27c0 | 539 | kfree(dev); |
86166b7b JK |
540 | goto out; |
541 | } | |
542 | ||
543 | init_waitqueue_head(&dev->wait); | |
277fe44d | 544 | spin_lock_init(&dev->list_lock); |
86166b7b JK |
545 | INIT_LIST_HEAD(&dev->list); |
546 | ||
547 | dev->hid = hid; | |
548 | dev->minor = minor; | |
549 | ||
550 | dev->exist = 1; | |
551 | hid->hidraw = dev; | |
552 | ||
8e552e53 | 553 | mutex_unlock(&minors_lock); |
86166b7b JK |
554 | out: |
555 | return result; | |
556 | ||
557 | } | |
558 | EXPORT_SYMBOL_GPL(hidraw_connect); | |
559 | ||
560 | void hidraw_disconnect(struct hid_device *hid) | |
561 | { | |
562 | struct hidraw *hidraw = hid->hidraw; | |
df0cfd69 JK |
563 | |
564 | mutex_lock(&minors_lock); | |
df0cfd69 | 565 | |
212a871a | 566 | drop_ref(hidraw, 1); |
df0cfd69 | 567 | |
df0cfd69 | 568 | mutex_unlock(&minors_lock); |
86166b7b JK |
569 | } |
570 | EXPORT_SYMBOL_GPL(hidraw_disconnect); | |
571 | ||
572 | int __init hidraw_init(void) | |
573 | { | |
574 | int result; | |
575 | dev_t dev_id; | |
576 | ||
577 | result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, | |
578 | HIDRAW_MAX_DEVICES, "hidraw"); | |
579 | ||
580 | hidraw_major = MAJOR(dev_id); | |
581 | ||
582 | if (result < 0) { | |
4291ee30 | 583 | pr_warn("can't get major number\n"); |
86166b7b JK |
584 | goto out; |
585 | } | |
586 | ||
587 | hidraw_class = class_create(THIS_MODULE, "hidraw"); | |
588 | if (IS_ERR(hidraw_class)) { | |
589 | result = PTR_ERR(hidraw_class); | |
bcb4a75b | 590 | goto error_cdev; |
86166b7b JK |
591 | } |
592 | ||
593 | cdev_init(&hidraw_cdev, &hidraw_ops); | |
bcb4a75b AK |
594 | result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); |
595 | if (result < 0) | |
596 | goto error_class; | |
597 | ||
0f690ccf | 598 | printk(KERN_INFO "hidraw: raw HID events driver (C) Jiri Kosina\n"); |
86166b7b JK |
599 | out: |
600 | return result; | |
bcb4a75b AK |
601 | |
602 | error_class: | |
603 | class_destroy(hidraw_class); | |
604 | error_cdev: | |
605 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); | |
606 | goto out; | |
86166b7b JK |
607 | } |
608 | ||
140ae3eb | 609 | void hidraw_exit(void) |
86166b7b JK |
610 | { |
611 | dev_t dev_id = MKDEV(hidraw_major, 0); | |
612 | ||
613 | cdev_del(&hidraw_cdev); | |
614 | class_destroy(hidraw_class); | |
615 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); | |
616 | ||
617 | } |