Commit | Line | Data |
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a32dd67d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
86166b7b JK |
2 | /* |
3 | * HID raw devices, giving access to raw HID events. | |
4 | * | |
5 | * In comparison to hiddev, this device does not process the | |
6 | * hid events at all (no parsing, no lookups). This lets applications | |
7 | * to work on raw hid events as they want to, and avoids a need to | |
8 | * use a transport-specific userspace libhid/libusb libraries. | |
9 | * | |
61834535 | 10 | * Copyright (c) 2007-2014 Jiri Kosina |
86166b7b JK |
11 | */ |
12 | ||
86166b7b | 13 | |
4291ee30 JP |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
86166b7b JK |
16 | #include <linux/fs.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/errno.h> | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/cdev.h> | |
22 | #include <linux/poll.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/major.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
86166b7b JK |
26 | #include <linux/hid.h> |
27 | #include <linux/mutex.h> | |
174cd4b1 | 28 | #include <linux/sched/signal.h> |
8f507c8b | 29 | #include <linux/string.h> |
86166b7b JK |
30 | |
31 | #include <linux/hidraw.h> | |
32 | ||
33 | static int hidraw_major; | |
34 | static struct cdev hidraw_cdev; | |
35 | static struct class *hidraw_class; | |
36 | static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; | |
8590222e | 37 | static DECLARE_RWSEM(minors_rwsem); |
86166b7b JK |
38 | |
39 | static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
40 | { | |
41 | struct hidraw_list *list = file->private_data; | |
42 | int ret = 0, len; | |
86166b7b JK |
43 | DECLARE_WAITQUEUE(wait, current); |
44 | ||
b0e14951 | 45 | mutex_lock(&list->read_mutex); |
86166b7b | 46 | |
b0e14951 | 47 | while (ret == 0) { |
86166b7b JK |
48 | if (list->head == list->tail) { |
49 | add_wait_queue(&list->hidraw->wait, &wait); | |
50 | set_current_state(TASK_INTERRUPTIBLE); | |
51 | ||
52 | while (list->head == list->tail) { | |
86166b7b JK |
53 | if (signal_pending(current)) { |
54 | ret = -ERESTARTSYS; | |
55 | break; | |
56 | } | |
57 | if (!list->hidraw->exist) { | |
58 | ret = -EIO; | |
59 | break; | |
60 | } | |
7611e8d2 FF |
61 | if (file->f_flags & O_NONBLOCK) { |
62 | ret = -EAGAIN; | |
63 | break; | |
64 | } | |
86166b7b JK |
65 | |
66 | /* allow O_NONBLOCK to work well from other threads */ | |
67 | mutex_unlock(&list->read_mutex); | |
68 | schedule(); | |
69 | mutex_lock(&list->read_mutex); | |
70 | set_current_state(TASK_INTERRUPTIBLE); | |
71 | } | |
72 | ||
73 | set_current_state(TASK_RUNNING); | |
74 | remove_wait_queue(&list->hidraw->wait, &wait); | |
75 | } | |
76 | ||
77 | if (ret) | |
78 | goto out; | |
79 | ||
86166b7b JK |
80 | len = list->buffer[list->tail].len > count ? |
81 | count : list->buffer[list->tail].len; | |
82 | ||
b6787242 JK |
83 | if (list->buffer[list->tail].value) { |
84 | if (copy_to_user(buffer, list->buffer[list->tail].value, len)) { | |
85 | ret = -EFAULT; | |
86 | goto out; | |
87 | } | |
88 | ret = len; | |
86166b7b | 89 | } |
86166b7b JK |
90 | |
91 | kfree(list->buffer[list->tail].value); | |
4c7b417e | 92 | list->buffer[list->tail].value = NULL; |
86166b7b JK |
93 | list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); |
94 | } | |
95 | out: | |
96 | mutex_unlock(&list->read_mutex); | |
97 | return ret; | |
98 | } | |
99 | ||
61834535 JK |
100 | /* |
101 | * The first byte of the report buffer is expected to be a report number. | |
61834535 | 102 | */ |
b4dbde9d | 103 | static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type) |
86166b7b | 104 | { |
496ad9aa | 105 | unsigned int minor = iminor(file_inode(file)); |
2e57480b | 106 | struct hid_device *dev; |
86166b7b JK |
107 | __u8 *buf; |
108 | int ret = 0; | |
109 | ||
8590222e | 110 | lockdep_assert_held(&minors_rwsem); |
cc7ed49a | 111 | |
212a871a | 112 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
e42dee9a AO |
113 | ret = -ENODEV; |
114 | goto out; | |
115 | } | |
116 | ||
2e57480b JK |
117 | dev = hidraw_table[minor]->hid; |
118 | ||
2b107d62 | 119 | if (count > HID_MAX_BUFFER_SIZE) { |
4291ee30 JP |
120 | hid_warn(dev, "pid %d passed too large report\n", |
121 | task_pid_nr(current)); | |
2e57480b JK |
122 | ret = -EINVAL; |
123 | goto out; | |
86166b7b JK |
124 | } |
125 | ||
126 | if (count < 2) { | |
4291ee30 JP |
127 | hid_warn(dev, "pid %d passed too short report\n", |
128 | task_pid_nr(current)); | |
2e57480b JK |
129 | ret = -EINVAL; |
130 | goto out; | |
86166b7b JK |
131 | } |
132 | ||
8f507c8b DT |
133 | buf = memdup_user(buffer, count); |
134 | if (IS_ERR(buf)) { | |
135 | ret = PTR_ERR(buf); | |
2e57480b JK |
136 | goto out; |
137 | } | |
86166b7b | 138 | |
e534a935 BT |
139 | if ((report_type == HID_OUTPUT_REPORT) && |
140 | !(dev->quirks & HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP)) { | |
3a75b249 BT |
141 | ret = hid_hw_output_report(dev, buf, count); |
142 | /* | |
143 | * compatibility with old implementation of USB-HID and I2C-HID: | |
144 | * if the device does not support receiving output reports, | |
145 | * on an interrupt endpoint, fallback to SET_REPORT HID command. | |
146 | */ | |
147 | if (ret != -ENOSYS) | |
148 | goto out_free; | |
149 | } | |
150 | ||
151 | ret = hid_hw_raw_request(dev, buf[0], buf, count, report_type, | |
152 | HID_REQ_SET_REPORT); | |
153 | ||
2e57480b | 154 | out_free: |
86166b7b | 155 | kfree(buf); |
2e57480b | 156 | out: |
b4dbde9d AO |
157 | return ret; |
158 | } | |
159 | ||
b4dbde9d AO |
160 | static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
161 | { | |
162 | ssize_t ret; | |
8590222e | 163 | down_read(&minors_rwsem); |
b4dbde9d | 164 | ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT); |
8590222e | 165 | up_read(&minors_rwsem); |
86166b7b JK |
166 | return ret; |
167 | } | |
168 | ||
b4dbde9d | 169 | |
61834535 JK |
170 | /* |
171 | * This function performs a Get_Report transfer over the control endpoint | |
d2a1cfeb | 172 | * per section 7.2.1 of the HID specification, version 1.1. The first byte |
f43d3870 | 173 | * of buffer is the report number to request, or 0x0 if the device does not |
d2a1cfeb | 174 | * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT |
61834535 | 175 | * or HID_INPUT_REPORT. |
61834535 | 176 | */ |
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 | ||
8590222e | 185 | lockdep_assert_held(&minors_rwsem); |
cc7ed49a | 186 | |
a955358d RRC |
187 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
188 | ret = -ENODEV; | |
189 | goto out; | |
190 | } | |
191 | ||
b4dbde9d AO |
192 | dev = hidraw_table[minor]->hid; |
193 | ||
cafebc05 | 194 | if (!dev->ll_driver->raw_request) { |
b4dbde9d AO |
195 | ret = -ENODEV; |
196 | goto out; | |
197 | } | |
198 | ||
199 | if (count > HID_MAX_BUFFER_SIZE) { | |
b05cec61 RG |
200 | hid_warn(dev, "pid %d passed too large report\n", |
201 | task_pid_nr(current)); | |
b4dbde9d AO |
202 | ret = -EINVAL; |
203 | goto out; | |
204 | } | |
205 | ||
206 | if (count < 2) { | |
b05cec61 RG |
207 | hid_warn(dev, "pid %d passed too short report\n", |
208 | task_pid_nr(current)); | |
b4dbde9d AO |
209 | ret = -EINVAL; |
210 | goto out; | |
211 | } | |
212 | ||
6da2ec56 | 213 | buf = kmalloc(count, GFP_KERNEL); |
b4dbde9d AO |
214 | if (!buf) { |
215 | ret = -ENOMEM; | |
216 | goto out; | |
217 | } | |
218 | ||
61834535 JK |
219 | /* |
220 | * Read the first byte from the user. This is the report number, | |
cafebc05 | 221 | * which is passed to hid_hw_raw_request(). |
61834535 | 222 | */ |
b4dbde9d AO |
223 | if (copy_from_user(&report_number, buffer, 1)) { |
224 | ret = -EFAULT; | |
225 | goto out_free; | |
226 | } | |
227 | ||
cafebc05 BT |
228 | ret = hid_hw_raw_request(dev, report_number, buf, count, report_type, |
229 | HID_REQ_GET_REPORT); | |
b4dbde9d AO |
230 | |
231 | if (ret < 0) | |
232 | goto out_free; | |
233 | ||
234 | len = (ret < count) ? ret : count; | |
235 | ||
236 | if (copy_to_user(buffer, buf, len)) { | |
237 | ret = -EFAULT; | |
238 | goto out_free; | |
239 | } | |
240 | ||
241 | ret = len; | |
242 | ||
243 | out_free: | |
244 | kfree(buf); | |
245 | out: | |
246 | return ret; | |
247 | } | |
248 | ||
afc9a42b | 249 | static __poll_t hidraw_poll(struct file *file, poll_table *wait) |
86166b7b JK |
250 | { |
251 | struct hidraw_list *list = file->private_data; | |
9e635c28 | 252 | __poll_t mask = EPOLLOUT | EPOLLWRNORM; /* hidraw is always writable */ |
86166b7b JK |
253 | |
254 | poll_wait(file, &list->hidraw->wait, wait); | |
255 | if (list->head != list->tail) | |
9e635c28 | 256 | mask |= EPOLLIN | EPOLLRDNORM; |
86166b7b | 257 | if (!list->hidraw->exist) |
9e635c28 JK |
258 | mask |= EPOLLERR | EPOLLHUP; |
259 | return mask; | |
86166b7b JK |
260 | } |
261 | ||
262 | static int hidraw_open(struct inode *inode, struct file *file) | |
263 | { | |
264 | unsigned int minor = iminor(inode); | |
265 | struct hidraw *dev; | |
266 | struct hidraw_list *list; | |
277fe44d | 267 | unsigned long flags; |
86166b7b JK |
268 | int err = 0; |
269 | ||
270 | if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { | |
271 | err = -ENOMEM; | |
272 | goto out; | |
273 | } | |
274 | ||
8590222e | 275 | down_read(&minors_rwsem); |
212a871a | 276 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
86166b7b JK |
277 | err = -ENODEV; |
278 | goto out_unlock; | |
279 | } | |
280 | ||
86166b7b | 281 | dev = hidraw_table[minor]; |
7d672cd7 | 282 | if (!dev->open++) { |
5bea7660 | 283 | err = hid_hw_power(dev->hid, PM_HINT_FULLON); |
f554ff80 AN |
284 | if (err < 0) { |
285 | dev->open--; | |
5bea7660 | 286 | goto out_unlock; |
f554ff80 | 287 | } |
5bea7660 DT |
288 | |
289 | err = hid_hw_open(dev->hid); | |
0361a28d | 290 | if (err < 0) { |
5bea7660 | 291 | hid_hw_power(dev->hid, PM_HINT_NORMAL); |
7d672cd7 | 292 | dev->open--; |
277fe44d | 293 | goto out_unlock; |
0361a28d | 294 | } |
7d672cd7 | 295 | } |
86166b7b | 296 | |
277fe44d YZ |
297 | list->hidraw = hidraw_table[minor]; |
298 | mutex_init(&list->read_mutex); | |
299 | spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); | |
300 | list_add_tail(&list->node, &hidraw_table[minor]->list); | |
301 | spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); | |
302 | file->private_data = list; | |
86166b7b | 303 | out_unlock: |
8590222e | 304 | up_read(&minors_rwsem); |
7d672cd7 | 305 | out: |
1a896231 AN |
306 | if (err < 0) |
307 | kfree(list); | |
86166b7b JK |
308 | return err; |
309 | ||
310 | } | |
311 | ||
b5531318 AD |
312 | static int hidraw_fasync(int fd, struct file *file, int on) |
313 | { | |
314 | struct hidraw_list *list = file->private_data; | |
315 | ||
316 | return fasync_helper(fd, file, on, &list->fasync); | |
317 | } | |
318 | ||
212a871a MC |
319 | static void drop_ref(struct hidraw *hidraw, int exists_bit) |
320 | { | |
321 | if (exists_bit) { | |
212a871a | 322 | hidraw->exist = 0; |
0f5a24c6 MC |
323 | if (hidraw->open) { |
324 | hid_hw_close(hidraw->hid); | |
212a871a | 325 | wake_up_interruptible(&hidraw->wait); |
0f5a24c6 | 326 | } |
47587fc0 FLVC |
327 | device_destroy(hidraw_class, |
328 | MKDEV(hidraw_major, hidraw->minor)); | |
212a871a MC |
329 | } else { |
330 | --hidraw->open; | |
331 | } | |
0f5a24c6 MC |
332 | if (!hidraw->open) { |
333 | if (!hidraw->exist) { | |
0f5a24c6 MC |
334 | hidraw_table[hidraw->minor] = NULL; |
335 | kfree(hidraw); | |
336 | } else { | |
337 | /* close device for last reader */ | |
0f5a24c6 | 338 | hid_hw_close(hidraw->hid); |
814b6d17 | 339 | hid_hw_power(hidraw->hid, PM_HINT_NORMAL); |
0f5a24c6 | 340 | } |
212a871a MC |
341 | } |
342 | } | |
343 | ||
86166b7b JK |
344 | static int hidraw_release(struct inode * inode, struct file * file) |
345 | { | |
346 | unsigned int minor = iminor(inode); | |
86166b7b | 347 | struct hidraw_list *list = file->private_data; |
277fe44d | 348 | unsigned long flags; |
df0cfd69 | 349 | |
8590222e | 350 | down_write(&minors_rwsem); |
86166b7b | 351 | |
277fe44d | 352 | spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); |
a5623a20 KA |
353 | for (int i = list->tail; i < list->head; i++) |
354 | kfree(list->buffer[i].value); | |
86166b7b | 355 | list_del(&list->node); |
277fe44d | 356 | spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); |
4db1c62c | 357 | kfree(list); |
df0cfd69 | 358 | |
212a871a MC |
359 | drop_ref(hidraw_table[minor], 0); |
360 | ||
8590222e | 361 | up_write(&minors_rwsem); |
212a871a | 362 | return 0; |
86166b7b JK |
363 | } |
364 | ||
979c407e AC |
365 | static long hidraw_ioctl(struct file *file, unsigned int cmd, |
366 | unsigned long arg) | |
86166b7b | 367 | { |
496ad9aa | 368 | struct inode *inode = file_inode(file); |
86166b7b | 369 | unsigned int minor = iminor(inode); |
979c407e | 370 | long ret = 0; |
2e57480b | 371 | struct hidraw *dev; |
86166b7b JK |
372 | void __user *user_arg = (void __user*) arg; |
373 | ||
8590222e | 374 | down_read(&minors_rwsem); |
2e57480b | 375 | dev = hidraw_table[minor]; |
416dacb8 | 376 | if (!dev || !dev->exist) { |
d20d5ffa AO |
377 | ret = -ENODEV; |
378 | goto out; | |
379 | } | |
2e57480b | 380 | |
86166b7b JK |
381 | switch (cmd) { |
382 | case HIDIOCGRDESCSIZE: | |
383 | if (put_user(dev->hid->rsize, (int __user *)arg)) | |
979c407e AC |
384 | ret = -EFAULT; |
385 | break; | |
86166b7b JK |
386 | |
387 | case HIDIOCGRDESC: | |
388 | { | |
389 | __u32 len; | |
390 | ||
391 | if (get_user(len, (int __user *)arg)) | |
979c407e AC |
392 | ret = -EFAULT; |
393 | else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) | |
394 | ret = -EINVAL; | |
395 | else if (copy_to_user(user_arg + offsetof( | |
396 | struct hidraw_report_descriptor, | |
397 | value[0]), | |
398 | dev->hid->rdesc, | |
399 | min(dev->hid->rsize, len))) | |
400 | ret = -EFAULT; | |
401 | break; | |
86166b7b JK |
402 | } |
403 | case HIDIOCGRAWINFO: | |
404 | { | |
405 | struct hidraw_devinfo dinfo; | |
406 | ||
407 | dinfo.bustype = dev->hid->bus; | |
408 | dinfo.vendor = dev->hid->vendor; | |
409 | dinfo.product = dev->hid->product; | |
410 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
979c407e AC |
411 | ret = -EFAULT; |
412 | break; | |
86166b7b JK |
413 | } |
414 | default: | |
9188e79e JK |
415 | { |
416 | struct hid_device *hid = dev->hid; | |
b4dbde9d AO |
417 | if (_IOC_TYPE(cmd) != 'H') { |
418 | ret = -EINVAL; | |
419 | break; | |
420 | } | |
421 | ||
422 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) { | |
423 | int len = _IOC_SIZE(cmd); | |
424 | ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT); | |
425 | break; | |
426 | } | |
427 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) { | |
428 | int len = _IOC_SIZE(cmd); | |
429 | ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT); | |
430 | break; | |
431 | } | |
432 | ||
f43d3870 DC |
433 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSINPUT(0))) { |
434 | int len = _IOC_SIZE(cmd); | |
435 | ret = hidraw_send_report(file, user_arg, len, HID_INPUT_REPORT); | |
436 | break; | |
437 | } | |
438 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGINPUT(0))) { | |
439 | int len = _IOC_SIZE(cmd); | |
440 | ret = hidraw_get_report(file, user_arg, len, HID_INPUT_REPORT); | |
441 | break; | |
442 | } | |
443 | ||
444 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSOUTPUT(0))) { | |
445 | int len = _IOC_SIZE(cmd); | |
446 | ret = hidraw_send_report(file, user_arg, len, HID_OUTPUT_REPORT); | |
447 | break; | |
448 | } | |
449 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGOUTPUT(0))) { | |
450 | int len = _IOC_SIZE(cmd); | |
451 | ret = hidraw_get_report(file, user_arg, len, HID_OUTPUT_REPORT); | |
452 | break; | |
453 | } | |
454 | ||
b4dbde9d AO |
455 | /* Begin Read-only ioctls. */ |
456 | if (_IOC_DIR(cmd) != _IOC_READ) { | |
dfd395af DC |
457 | ret = -EINVAL; |
458 | break; | |
459 | } | |
9188e79e JK |
460 | |
461 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { | |
dd2ed487 | 462 | int len = strlen(hid->name) + 1; |
9188e79e JK |
463 | if (len > _IOC_SIZE(cmd)) |
464 | len = _IOC_SIZE(cmd); | |
dfd395af | 465 | ret = copy_to_user(user_arg, hid->name, len) ? |
9188e79e | 466 | -EFAULT : len; |
dfd395af | 467 | break; |
9188e79e JK |
468 | } |
469 | ||
470 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { | |
dd2ed487 | 471 | int len = strlen(hid->phys) + 1; |
9188e79e JK |
472 | if (len > _IOC_SIZE(cmd)) |
473 | len = _IOC_SIZE(cmd); | |
dfd395af | 474 | ret = copy_to_user(user_arg, hid->phys, len) ? |
9188e79e | 475 | -EFAULT : len; |
dfd395af | 476 | break; |
9188e79e | 477 | } |
2f48865d MH |
478 | |
479 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWUNIQ(0))) { | |
480 | int len = strlen(hid->uniq) + 1; | |
481 | if (len > _IOC_SIZE(cmd)) | |
482 | len = _IOC_SIZE(cmd); | |
483 | ret = copy_to_user(user_arg, hid->uniq, len) ? | |
484 | -EFAULT : len; | |
485 | break; | |
486 | } | |
b4dbde9d | 487 | } |
9188e79e | 488 | |
dfd395af | 489 | ret = -ENOTTY; |
86166b7b | 490 | } |
d20d5ffa | 491 | out: |
8590222e | 492 | up_read(&minors_rwsem); |
979c407e | 493 | return ret; |
86166b7b JK |
494 | } |
495 | ||
496 | static const struct file_operations hidraw_ops = { | |
497 | .owner = THIS_MODULE, | |
498 | .read = hidraw_read, | |
499 | .write = hidraw_write, | |
500 | .poll = hidraw_poll, | |
501 | .open = hidraw_open, | |
502 | .release = hidraw_release, | |
979c407e | 503 | .unlocked_ioctl = hidraw_ioctl, |
b5531318 | 504 | .fasync = hidraw_fasync, |
1832f2d8 | 505 | .compat_ioctl = compat_ptr_ioctl, |
6038f373 | 506 | .llseek = noop_llseek, |
86166b7b JK |
507 | }; |
508 | ||
b6787242 | 509 | int hidraw_report_event(struct hid_device *hid, u8 *data, int len) |
86166b7b JK |
510 | { |
511 | struct hidraw *dev = hid->hidraw; | |
512 | struct hidraw_list *list; | |
b6787242 | 513 | int ret = 0; |
277fe44d | 514 | unsigned long flags; |
86166b7b | 515 | |
277fe44d | 516 | spin_lock_irqsave(&dev->list_lock, flags); |
86166b7b | 517 | list_for_each_entry(list, &dev->list, node) { |
4c7b417e MC |
518 | int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); |
519 | ||
520 | if (new_head == list->tail) | |
521 | continue; | |
522 | ||
b6787242 JK |
523 | if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) { |
524 | ret = -ENOMEM; | |
525 | break; | |
526 | } | |
86166b7b | 527 | list->buffer[list->head].len = len; |
4c7b417e | 528 | list->head = new_head; |
86166b7b JK |
529 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
530 | } | |
277fe44d | 531 | spin_unlock_irqrestore(&dev->list_lock, flags); |
86166b7b JK |
532 | |
533 | wake_up_interruptible(&dev->wait); | |
b6787242 | 534 | return ret; |
86166b7b JK |
535 | } |
536 | EXPORT_SYMBOL_GPL(hidraw_report_event); | |
537 | ||
538 | int hidraw_connect(struct hid_device *hid) | |
539 | { | |
709d27c0 | 540 | int minor, result; |
86166b7b JK |
541 | struct hidraw *dev; |
542 | ||
61834535 | 543 | /* we accept any HID device, all applications */ |
86166b7b | 544 | |
709d27c0 MK |
545 | dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
546 | if (!dev) | |
547 | return -ENOMEM; | |
548 | ||
549 | result = -EINVAL; | |
86166b7b | 550 | |
8590222e | 551 | down_write(&minors_rwsem); |
86166b7b JK |
552 | |
553 | for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { | |
554 | if (hidraw_table[minor]) | |
555 | continue; | |
556 | hidraw_table[minor] = dev; | |
557 | result = 0; | |
558 | break; | |
559 | } | |
560 | ||
709d27c0 | 561 | if (result) { |
8590222e | 562 | up_write(&minors_rwsem); |
709d27c0 | 563 | kfree(dev); |
86166b7b | 564 | goto out; |
709d27c0 | 565 | } |
86166b7b | 566 | |
aae6c286 | 567 | dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor), |
a9b12619 | 568 | NULL, "%s%d", "hidraw", minor); |
86166b7b JK |
569 | |
570 | if (IS_ERR(dev->dev)) { | |
86166b7b | 571 | hidraw_table[minor] = NULL; |
8590222e | 572 | up_write(&minors_rwsem); |
86166b7b | 573 | result = PTR_ERR(dev->dev); |
709d27c0 | 574 | kfree(dev); |
86166b7b JK |
575 | goto out; |
576 | } | |
577 | ||
578 | init_waitqueue_head(&dev->wait); | |
277fe44d | 579 | spin_lock_init(&dev->list_lock); |
86166b7b JK |
580 | INIT_LIST_HEAD(&dev->list); |
581 | ||
582 | dev->hid = hid; | |
583 | dev->minor = minor; | |
584 | ||
585 | dev->exist = 1; | |
586 | hid->hidraw = dev; | |
587 | ||
8590222e | 588 | up_write(&minors_rwsem); |
86166b7b JK |
589 | out: |
590 | return result; | |
591 | ||
592 | } | |
593 | EXPORT_SYMBOL_GPL(hidraw_connect); | |
594 | ||
595 | void hidraw_disconnect(struct hid_device *hid) | |
596 | { | |
597 | struct hidraw *hidraw = hid->hidraw; | |
df0cfd69 | 598 | |
8590222e | 599 | down_write(&minors_rwsem); |
df0cfd69 | 600 | |
212a871a | 601 | drop_ref(hidraw, 1); |
df0cfd69 | 602 | |
8590222e | 603 | up_write(&minors_rwsem); |
86166b7b JK |
604 | } |
605 | EXPORT_SYMBOL_GPL(hidraw_disconnect); | |
606 | ||
607 | int __init hidraw_init(void) | |
608 | { | |
609 | int result; | |
610 | dev_t dev_id; | |
611 | ||
612 | result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, | |
613 | HIDRAW_MAX_DEVICES, "hidraw"); | |
86166b7b | 614 | if (result < 0) { |
4291ee30 | 615 | pr_warn("can't get major number\n"); |
86166b7b JK |
616 | goto out; |
617 | } | |
618 | ||
6edac6fd DC |
619 | hidraw_major = MAJOR(dev_id); |
620 | ||
86166b7b JK |
621 | hidraw_class = class_create(THIS_MODULE, "hidraw"); |
622 | if (IS_ERR(hidraw_class)) { | |
623 | result = PTR_ERR(hidraw_class); | |
bcb4a75b | 624 | goto error_cdev; |
86166b7b JK |
625 | } |
626 | ||
627 | cdev_init(&hidraw_cdev, &hidraw_ops); | |
bcb4a75b AK |
628 | result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); |
629 | if (result < 0) | |
630 | goto error_class; | |
631 | ||
b05cec61 | 632 | pr_info("raw HID events driver (C) Jiri Kosina\n"); |
86166b7b JK |
633 | out: |
634 | return result; | |
bcb4a75b AK |
635 | |
636 | error_class: | |
637 | class_destroy(hidraw_class); | |
638 | error_cdev: | |
639 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); | |
640 | goto out; | |
86166b7b JK |
641 | } |
642 | ||
140ae3eb | 643 | void hidraw_exit(void) |
86166b7b JK |
644 | { |
645 | dev_t dev_id = MKDEV(hidraw_major, 0); | |
646 | ||
647 | cdev_del(&hidraw_cdev); | |
648 | class_destroy(hidraw_class); | |
649 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); | |
650 | ||
651 | } |