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; | |
32944855 GKH |
35 | static const struct class hidraw_class = { |
36 | .name = "hidraw", | |
37 | }; | |
86166b7b | 38 | static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; |
8590222e | 39 | static DECLARE_RWSEM(minors_rwsem); |
86166b7b JK |
40 | |
41 | static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
42 | { | |
43 | struct hidraw_list *list = file->private_data; | |
44 | int ret = 0, len; | |
86166b7b JK |
45 | DECLARE_WAITQUEUE(wait, current); |
46 | ||
b0e14951 | 47 | mutex_lock(&list->read_mutex); |
86166b7b | 48 | |
b0e14951 | 49 | while (ret == 0) { |
86166b7b JK |
50 | if (list->head == list->tail) { |
51 | add_wait_queue(&list->hidraw->wait, &wait); | |
52 | set_current_state(TASK_INTERRUPTIBLE); | |
53 | ||
54 | while (list->head == list->tail) { | |
86166b7b JK |
55 | if (signal_pending(current)) { |
56 | ret = -ERESTARTSYS; | |
57 | break; | |
58 | } | |
59 | if (!list->hidraw->exist) { | |
60 | ret = -EIO; | |
61 | break; | |
62 | } | |
7611e8d2 FF |
63 | if (file->f_flags & O_NONBLOCK) { |
64 | ret = -EAGAIN; | |
65 | break; | |
66 | } | |
86166b7b JK |
67 | |
68 | /* allow O_NONBLOCK to work well from other threads */ | |
69 | mutex_unlock(&list->read_mutex); | |
70 | schedule(); | |
71 | mutex_lock(&list->read_mutex); | |
72 | set_current_state(TASK_INTERRUPTIBLE); | |
73 | } | |
74 | ||
75 | set_current_state(TASK_RUNNING); | |
76 | remove_wait_queue(&list->hidraw->wait, &wait); | |
77 | } | |
78 | ||
79 | if (ret) | |
80 | goto out; | |
81 | ||
86166b7b JK |
82 | len = list->buffer[list->tail].len > count ? |
83 | count : list->buffer[list->tail].len; | |
84 | ||
b6787242 JK |
85 | if (list->buffer[list->tail].value) { |
86 | if (copy_to_user(buffer, list->buffer[list->tail].value, len)) { | |
87 | ret = -EFAULT; | |
88 | goto out; | |
89 | } | |
90 | ret = len; | |
86166b7b | 91 | } |
86166b7b JK |
92 | |
93 | kfree(list->buffer[list->tail].value); | |
4c7b417e | 94 | list->buffer[list->tail].value = NULL; |
86166b7b JK |
95 | list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); |
96 | } | |
97 | out: | |
98 | mutex_unlock(&list->read_mutex); | |
99 | return ret; | |
100 | } | |
101 | ||
61834535 JK |
102 | /* |
103 | * The first byte of the report buffer is expected to be a report number. | |
61834535 | 104 | */ |
b4dbde9d | 105 | static ssize_t hidraw_send_report(struct file *file, const char __user *buffer, size_t count, unsigned char report_type) |
86166b7b | 106 | { |
496ad9aa | 107 | unsigned int minor = iminor(file_inode(file)); |
2e57480b | 108 | struct hid_device *dev; |
86166b7b JK |
109 | __u8 *buf; |
110 | int ret = 0; | |
111 | ||
8590222e | 112 | lockdep_assert_held(&minors_rwsem); |
cc7ed49a | 113 | |
212a871a | 114 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
e42dee9a AO |
115 | ret = -ENODEV; |
116 | goto out; | |
117 | } | |
118 | ||
2e57480b JK |
119 | dev = hidraw_table[minor]->hid; |
120 | ||
2b107d62 | 121 | if (count > HID_MAX_BUFFER_SIZE) { |
4291ee30 JP |
122 | hid_warn(dev, "pid %d passed too large report\n", |
123 | task_pid_nr(current)); | |
2e57480b JK |
124 | ret = -EINVAL; |
125 | goto out; | |
86166b7b JK |
126 | } |
127 | ||
128 | if (count < 2) { | |
4291ee30 JP |
129 | hid_warn(dev, "pid %d passed too short report\n", |
130 | task_pid_nr(current)); | |
2e57480b JK |
131 | ret = -EINVAL; |
132 | goto out; | |
86166b7b JK |
133 | } |
134 | ||
8f507c8b DT |
135 | buf = memdup_user(buffer, count); |
136 | if (IS_ERR(buf)) { | |
137 | ret = PTR_ERR(buf); | |
2e57480b JK |
138 | goto out; |
139 | } | |
86166b7b | 140 | |
e534a935 BT |
141 | if ((report_type == HID_OUTPUT_REPORT) && |
142 | !(dev->quirks & HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP)) { | |
3a75b249 BT |
143 | ret = hid_hw_output_report(dev, buf, count); |
144 | /* | |
145 | * compatibility with old implementation of USB-HID and I2C-HID: | |
146 | * if the device does not support receiving output reports, | |
147 | * on an interrupt endpoint, fallback to SET_REPORT HID command. | |
148 | */ | |
149 | if (ret != -ENOSYS) | |
150 | goto out_free; | |
151 | } | |
152 | ||
153 | ret = hid_hw_raw_request(dev, buf[0], buf, count, report_type, | |
154 | HID_REQ_SET_REPORT); | |
155 | ||
2e57480b | 156 | out_free: |
86166b7b | 157 | kfree(buf); |
2e57480b | 158 | out: |
b4dbde9d AO |
159 | return ret; |
160 | } | |
161 | ||
b4dbde9d AO |
162 | static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
163 | { | |
164 | ssize_t ret; | |
8590222e | 165 | down_read(&minors_rwsem); |
b4dbde9d | 166 | ret = hidraw_send_report(file, buffer, count, HID_OUTPUT_REPORT); |
8590222e | 167 | up_read(&minors_rwsem); |
86166b7b JK |
168 | return ret; |
169 | } | |
170 | ||
b4dbde9d | 171 | |
61834535 JK |
172 | /* |
173 | * This function performs a Get_Report transfer over the control endpoint | |
d2a1cfeb | 174 | * per section 7.2.1 of the HID specification, version 1.1. The first byte |
f43d3870 | 175 | * of buffer is the report number to request, or 0x0 if the device does not |
d2a1cfeb | 176 | * use numbered reports. The report_type parameter can be HID_FEATURE_REPORT |
61834535 | 177 | * or HID_INPUT_REPORT. |
61834535 | 178 | */ |
b4dbde9d AO |
179 | static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t count, unsigned char report_type) |
180 | { | |
496ad9aa | 181 | unsigned int minor = iminor(file_inode(file)); |
b4dbde9d AO |
182 | struct hid_device *dev; |
183 | __u8 *buf; | |
184 | int ret = 0, len; | |
185 | unsigned char report_number; | |
186 | ||
8590222e | 187 | lockdep_assert_held(&minors_rwsem); |
cc7ed49a | 188 | |
a955358d RRC |
189 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
190 | ret = -ENODEV; | |
191 | goto out; | |
192 | } | |
193 | ||
b4dbde9d AO |
194 | dev = hidraw_table[minor]->hid; |
195 | ||
cafebc05 | 196 | if (!dev->ll_driver->raw_request) { |
b4dbde9d AO |
197 | ret = -ENODEV; |
198 | goto out; | |
199 | } | |
200 | ||
201 | if (count > HID_MAX_BUFFER_SIZE) { | |
b05cec61 RG |
202 | hid_warn(dev, "pid %d passed too large report\n", |
203 | task_pid_nr(current)); | |
b4dbde9d AO |
204 | ret = -EINVAL; |
205 | goto out; | |
206 | } | |
207 | ||
208 | if (count < 2) { | |
b05cec61 RG |
209 | hid_warn(dev, "pid %d passed too short report\n", |
210 | task_pid_nr(current)); | |
b4dbde9d AO |
211 | ret = -EINVAL; |
212 | goto out; | |
213 | } | |
214 | ||
6da2ec56 | 215 | buf = kmalloc(count, GFP_KERNEL); |
b4dbde9d AO |
216 | if (!buf) { |
217 | ret = -ENOMEM; | |
218 | goto out; | |
219 | } | |
220 | ||
61834535 JK |
221 | /* |
222 | * Read the first byte from the user. This is the report number, | |
cafebc05 | 223 | * which is passed to hid_hw_raw_request(). |
61834535 | 224 | */ |
b4dbde9d AO |
225 | if (copy_from_user(&report_number, buffer, 1)) { |
226 | ret = -EFAULT; | |
227 | goto out_free; | |
228 | } | |
229 | ||
cafebc05 BT |
230 | ret = hid_hw_raw_request(dev, report_number, buf, count, report_type, |
231 | HID_REQ_GET_REPORT); | |
b4dbde9d AO |
232 | |
233 | if (ret < 0) | |
234 | goto out_free; | |
235 | ||
236 | len = (ret < count) ? ret : count; | |
237 | ||
238 | if (copy_to_user(buffer, buf, len)) { | |
239 | ret = -EFAULT; | |
240 | goto out_free; | |
241 | } | |
242 | ||
243 | ret = len; | |
244 | ||
245 | out_free: | |
246 | kfree(buf); | |
247 | out: | |
248 | return ret; | |
249 | } | |
250 | ||
afc9a42b | 251 | static __poll_t hidraw_poll(struct file *file, poll_table *wait) |
86166b7b JK |
252 | { |
253 | struct hidraw_list *list = file->private_data; | |
9e635c28 | 254 | __poll_t mask = EPOLLOUT | EPOLLWRNORM; /* hidraw is always writable */ |
86166b7b JK |
255 | |
256 | poll_wait(file, &list->hidraw->wait, wait); | |
257 | if (list->head != list->tail) | |
9e635c28 | 258 | mask |= EPOLLIN | EPOLLRDNORM; |
86166b7b | 259 | if (!list->hidraw->exist) |
9e635c28 JK |
260 | mask |= EPOLLERR | EPOLLHUP; |
261 | return mask; | |
86166b7b JK |
262 | } |
263 | ||
264 | static int hidraw_open(struct inode *inode, struct file *file) | |
265 | { | |
266 | unsigned int minor = iminor(inode); | |
267 | struct hidraw *dev; | |
268 | struct hidraw_list *list; | |
277fe44d | 269 | unsigned long flags; |
86166b7b JK |
270 | int err = 0; |
271 | ||
272 | if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { | |
273 | err = -ENOMEM; | |
274 | goto out; | |
275 | } | |
276 | ||
944ee77d LM |
277 | /* |
278 | * Technically not writing to the hidraw_table but a write lock is | |
279 | * required to protect the device refcount. This is symmetrical to | |
280 | * hidraw_release(). | |
281 | */ | |
282 | down_write(&minors_rwsem); | |
212a871a | 283 | if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { |
86166b7b JK |
284 | err = -ENODEV; |
285 | goto out_unlock; | |
286 | } | |
287 | ||
86166b7b | 288 | dev = hidraw_table[minor]; |
7d672cd7 | 289 | if (!dev->open++) { |
5bea7660 | 290 | err = hid_hw_power(dev->hid, PM_HINT_FULLON); |
f554ff80 AN |
291 | if (err < 0) { |
292 | dev->open--; | |
5bea7660 | 293 | goto out_unlock; |
f554ff80 | 294 | } |
5bea7660 DT |
295 | |
296 | err = hid_hw_open(dev->hid); | |
0361a28d | 297 | if (err < 0) { |
5bea7660 | 298 | hid_hw_power(dev->hid, PM_HINT_NORMAL); |
7d672cd7 | 299 | dev->open--; |
277fe44d | 300 | goto out_unlock; |
0361a28d | 301 | } |
7d672cd7 | 302 | } |
86166b7b | 303 | |
277fe44d YZ |
304 | list->hidraw = hidraw_table[minor]; |
305 | mutex_init(&list->read_mutex); | |
306 | spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); | |
307 | list_add_tail(&list->node, &hidraw_table[minor]->list); | |
308 | spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); | |
309 | file->private_data = list; | |
86166b7b | 310 | out_unlock: |
944ee77d | 311 | up_write(&minors_rwsem); |
7d672cd7 | 312 | out: |
1a896231 AN |
313 | if (err < 0) |
314 | kfree(list); | |
86166b7b JK |
315 | return err; |
316 | ||
317 | } | |
318 | ||
b5531318 AD |
319 | static int hidraw_fasync(int fd, struct file *file, int on) |
320 | { | |
321 | struct hidraw_list *list = file->private_data; | |
322 | ||
323 | return fasync_helper(fd, file, on, &list->fasync); | |
324 | } | |
325 | ||
212a871a MC |
326 | static void drop_ref(struct hidraw *hidraw, int exists_bit) |
327 | { | |
328 | if (exists_bit) { | |
212a871a | 329 | hidraw->exist = 0; |
0f5a24c6 MC |
330 | if (hidraw->open) { |
331 | hid_hw_close(hidraw->hid); | |
212a871a | 332 | wake_up_interruptible(&hidraw->wait); |
0f5a24c6 | 333 | } |
32944855 | 334 | device_destroy(&hidraw_class, |
47587fc0 | 335 | MKDEV(hidraw_major, hidraw->minor)); |
212a871a MC |
336 | } else { |
337 | --hidraw->open; | |
338 | } | |
0f5a24c6 MC |
339 | if (!hidraw->open) { |
340 | if (!hidraw->exist) { | |
0f5a24c6 MC |
341 | hidraw_table[hidraw->minor] = NULL; |
342 | kfree(hidraw); | |
343 | } else { | |
344 | /* close device for last reader */ | |
0f5a24c6 | 345 | hid_hw_close(hidraw->hid); |
814b6d17 | 346 | hid_hw_power(hidraw->hid, PM_HINT_NORMAL); |
0f5a24c6 | 347 | } |
212a871a MC |
348 | } |
349 | } | |
350 | ||
86166b7b JK |
351 | static int hidraw_release(struct inode * inode, struct file * file) |
352 | { | |
353 | unsigned int minor = iminor(inode); | |
86166b7b | 354 | struct hidraw_list *list = file->private_data; |
277fe44d | 355 | unsigned long flags; |
df0cfd69 | 356 | |
8590222e | 357 | down_write(&minors_rwsem); |
86166b7b | 358 | |
277fe44d | 359 | spin_lock_irqsave(&hidraw_table[minor]->list_lock, flags); |
a3bdcdd0 SH |
360 | while (list->tail != list->head) { |
361 | kfree(list->buffer[list->tail].value); | |
362 | list->buffer[list->tail].value = NULL; | |
363 | list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); | |
364 | } | |
86166b7b | 365 | list_del(&list->node); |
277fe44d | 366 | spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); |
4db1c62c | 367 | kfree(list); |
df0cfd69 | 368 | |
212a871a MC |
369 | drop_ref(hidraw_table[minor], 0); |
370 | ||
8590222e | 371 | up_write(&minors_rwsem); |
212a871a | 372 | return 0; |
86166b7b JK |
373 | } |
374 | ||
979c407e AC |
375 | static long hidraw_ioctl(struct file *file, unsigned int cmd, |
376 | unsigned long arg) | |
86166b7b | 377 | { |
496ad9aa | 378 | struct inode *inode = file_inode(file); |
86166b7b | 379 | unsigned int minor = iminor(inode); |
979c407e | 380 | long ret = 0; |
2e57480b | 381 | struct hidraw *dev; |
86166b7b JK |
382 | void __user *user_arg = (void __user*) arg; |
383 | ||
8590222e | 384 | down_read(&minors_rwsem); |
2e57480b | 385 | dev = hidraw_table[minor]; |
416dacb8 | 386 | if (!dev || !dev->exist) { |
d20d5ffa AO |
387 | ret = -ENODEV; |
388 | goto out; | |
389 | } | |
2e57480b | 390 | |
86166b7b JK |
391 | switch (cmd) { |
392 | case HIDIOCGRDESCSIZE: | |
393 | if (put_user(dev->hid->rsize, (int __user *)arg)) | |
979c407e AC |
394 | ret = -EFAULT; |
395 | break; | |
86166b7b JK |
396 | |
397 | case HIDIOCGRDESC: | |
398 | { | |
399 | __u32 len; | |
400 | ||
401 | if (get_user(len, (int __user *)arg)) | |
979c407e AC |
402 | ret = -EFAULT; |
403 | else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) | |
404 | ret = -EINVAL; | |
405 | else if (copy_to_user(user_arg + offsetof( | |
406 | struct hidraw_report_descriptor, | |
407 | value[0]), | |
408 | dev->hid->rdesc, | |
409 | min(dev->hid->rsize, len))) | |
410 | ret = -EFAULT; | |
411 | break; | |
86166b7b JK |
412 | } |
413 | case HIDIOCGRAWINFO: | |
414 | { | |
415 | struct hidraw_devinfo dinfo; | |
416 | ||
417 | dinfo.bustype = dev->hid->bus; | |
418 | dinfo.vendor = dev->hid->vendor; | |
419 | dinfo.product = dev->hid->product; | |
420 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
979c407e AC |
421 | ret = -EFAULT; |
422 | break; | |
86166b7b JK |
423 | } |
424 | default: | |
9188e79e JK |
425 | { |
426 | struct hid_device *hid = dev->hid; | |
b4dbde9d AO |
427 | if (_IOC_TYPE(cmd) != 'H') { |
428 | ret = -EINVAL; | |
429 | break; | |
430 | } | |
431 | ||
432 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSFEATURE(0))) { | |
433 | int len = _IOC_SIZE(cmd); | |
434 | ret = hidraw_send_report(file, user_arg, len, HID_FEATURE_REPORT); | |
435 | break; | |
436 | } | |
437 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGFEATURE(0))) { | |
438 | int len = _IOC_SIZE(cmd); | |
439 | ret = hidraw_get_report(file, user_arg, len, HID_FEATURE_REPORT); | |
440 | break; | |
441 | } | |
442 | ||
f43d3870 DC |
443 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSINPUT(0))) { |
444 | int len = _IOC_SIZE(cmd); | |
445 | ret = hidraw_send_report(file, user_arg, len, HID_INPUT_REPORT); | |
446 | break; | |
447 | } | |
448 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGINPUT(0))) { | |
449 | int len = _IOC_SIZE(cmd); | |
450 | ret = hidraw_get_report(file, user_arg, len, HID_INPUT_REPORT); | |
451 | break; | |
452 | } | |
453 | ||
454 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCSOUTPUT(0))) { | |
455 | int len = _IOC_SIZE(cmd); | |
456 | ret = hidraw_send_report(file, user_arg, len, HID_OUTPUT_REPORT); | |
457 | break; | |
458 | } | |
459 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGOUTPUT(0))) { | |
460 | int len = _IOC_SIZE(cmd); | |
461 | ret = hidraw_get_report(file, user_arg, len, HID_OUTPUT_REPORT); | |
462 | break; | |
463 | } | |
464 | ||
b4dbde9d AO |
465 | /* Begin Read-only ioctls. */ |
466 | if (_IOC_DIR(cmd) != _IOC_READ) { | |
dfd395af DC |
467 | ret = -EINVAL; |
468 | break; | |
469 | } | |
9188e79e JK |
470 | |
471 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { | |
dd2ed487 | 472 | int len = strlen(hid->name) + 1; |
9188e79e JK |
473 | if (len > _IOC_SIZE(cmd)) |
474 | len = _IOC_SIZE(cmd); | |
dfd395af | 475 | ret = copy_to_user(user_arg, hid->name, len) ? |
9188e79e | 476 | -EFAULT : len; |
dfd395af | 477 | break; |
9188e79e JK |
478 | } |
479 | ||
480 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { | |
dd2ed487 | 481 | int len = strlen(hid->phys) + 1; |
9188e79e JK |
482 | if (len > _IOC_SIZE(cmd)) |
483 | len = _IOC_SIZE(cmd); | |
dfd395af | 484 | ret = copy_to_user(user_arg, hid->phys, len) ? |
9188e79e | 485 | -EFAULT : len; |
dfd395af | 486 | break; |
9188e79e | 487 | } |
2f48865d MH |
488 | |
489 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWUNIQ(0))) { | |
490 | int len = strlen(hid->uniq) + 1; | |
491 | if (len > _IOC_SIZE(cmd)) | |
492 | len = _IOC_SIZE(cmd); | |
493 | ret = copy_to_user(user_arg, hid->uniq, len) ? | |
494 | -EFAULT : len; | |
495 | break; | |
496 | } | |
b4dbde9d | 497 | } |
9188e79e | 498 | |
dfd395af | 499 | ret = -ENOTTY; |
86166b7b | 500 | } |
d20d5ffa | 501 | out: |
8590222e | 502 | up_read(&minors_rwsem); |
979c407e | 503 | return ret; |
86166b7b JK |
504 | } |
505 | ||
506 | static const struct file_operations hidraw_ops = { | |
507 | .owner = THIS_MODULE, | |
508 | .read = hidraw_read, | |
509 | .write = hidraw_write, | |
510 | .poll = hidraw_poll, | |
511 | .open = hidraw_open, | |
512 | .release = hidraw_release, | |
979c407e | 513 | .unlocked_ioctl = hidraw_ioctl, |
b5531318 | 514 | .fasync = hidraw_fasync, |
1832f2d8 | 515 | .compat_ioctl = compat_ptr_ioctl, |
6038f373 | 516 | .llseek = noop_llseek, |
86166b7b JK |
517 | }; |
518 | ||
b6787242 | 519 | int hidraw_report_event(struct hid_device *hid, u8 *data, int len) |
86166b7b JK |
520 | { |
521 | struct hidraw *dev = hid->hidraw; | |
522 | struct hidraw_list *list; | |
b6787242 | 523 | int ret = 0; |
277fe44d | 524 | unsigned long flags; |
86166b7b | 525 | |
277fe44d | 526 | spin_lock_irqsave(&dev->list_lock, flags); |
86166b7b | 527 | list_for_each_entry(list, &dev->list, node) { |
4c7b417e MC |
528 | int new_head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); |
529 | ||
530 | if (new_head == list->tail) | |
531 | continue; | |
532 | ||
b6787242 JK |
533 | if (!(list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC))) { |
534 | ret = -ENOMEM; | |
535 | break; | |
536 | } | |
86166b7b | 537 | list->buffer[list->head].len = len; |
4c7b417e | 538 | list->head = new_head; |
86166b7b JK |
539 | kill_fasync(&list->fasync, SIGIO, POLL_IN); |
540 | } | |
277fe44d | 541 | spin_unlock_irqrestore(&dev->list_lock, flags); |
86166b7b JK |
542 | |
543 | wake_up_interruptible(&dev->wait); | |
b6787242 | 544 | return ret; |
86166b7b JK |
545 | } |
546 | EXPORT_SYMBOL_GPL(hidraw_report_event); | |
547 | ||
548 | int hidraw_connect(struct hid_device *hid) | |
549 | { | |
709d27c0 | 550 | int minor, result; |
86166b7b JK |
551 | struct hidraw *dev; |
552 | ||
61834535 | 553 | /* we accept any HID device, all applications */ |
86166b7b | 554 | |
709d27c0 MK |
555 | dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
556 | if (!dev) | |
557 | return -ENOMEM; | |
558 | ||
559 | result = -EINVAL; | |
86166b7b | 560 | |
8590222e | 561 | down_write(&minors_rwsem); |
86166b7b JK |
562 | |
563 | for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { | |
564 | if (hidraw_table[minor]) | |
565 | continue; | |
566 | hidraw_table[minor] = dev; | |
567 | result = 0; | |
568 | break; | |
569 | } | |
570 | ||
709d27c0 | 571 | if (result) { |
8590222e | 572 | up_write(&minors_rwsem); |
709d27c0 | 573 | kfree(dev); |
86166b7b | 574 | goto out; |
709d27c0 | 575 | } |
86166b7b | 576 | |
32944855 | 577 | dev->dev = device_create(&hidraw_class, &hid->dev, MKDEV(hidraw_major, minor), |
a9b12619 | 578 | NULL, "%s%d", "hidraw", minor); |
86166b7b JK |
579 | |
580 | if (IS_ERR(dev->dev)) { | |
86166b7b | 581 | hidraw_table[minor] = NULL; |
8590222e | 582 | up_write(&minors_rwsem); |
86166b7b | 583 | result = PTR_ERR(dev->dev); |
709d27c0 | 584 | kfree(dev); |
86166b7b JK |
585 | goto out; |
586 | } | |
587 | ||
588 | init_waitqueue_head(&dev->wait); | |
277fe44d | 589 | spin_lock_init(&dev->list_lock); |
86166b7b JK |
590 | INIT_LIST_HEAD(&dev->list); |
591 | ||
592 | dev->hid = hid; | |
593 | dev->minor = minor; | |
594 | ||
595 | dev->exist = 1; | |
596 | hid->hidraw = dev; | |
597 | ||
8590222e | 598 | up_write(&minors_rwsem); |
86166b7b JK |
599 | out: |
600 | return result; | |
601 | ||
602 | } | |
603 | EXPORT_SYMBOL_GPL(hidraw_connect); | |
604 | ||
605 | void hidraw_disconnect(struct hid_device *hid) | |
606 | { | |
607 | struct hidraw *hidraw = hid->hidraw; | |
df0cfd69 | 608 | |
8590222e | 609 | down_write(&minors_rwsem); |
df0cfd69 | 610 | |
212a871a | 611 | drop_ref(hidraw, 1); |
df0cfd69 | 612 | |
8590222e | 613 | up_write(&minors_rwsem); |
86166b7b JK |
614 | } |
615 | EXPORT_SYMBOL_GPL(hidraw_disconnect); | |
616 | ||
617 | int __init hidraw_init(void) | |
618 | { | |
619 | int result; | |
620 | dev_t dev_id; | |
621 | ||
622 | result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, | |
623 | HIDRAW_MAX_DEVICES, "hidraw"); | |
86166b7b | 624 | if (result < 0) { |
4291ee30 | 625 | pr_warn("can't get major number\n"); |
86166b7b JK |
626 | goto out; |
627 | } | |
628 | ||
6edac6fd DC |
629 | hidraw_major = MAJOR(dev_id); |
630 | ||
32944855 GKH |
631 | result = class_register(&hidraw_class); |
632 | if (result) | |
bcb4a75b | 633 | goto error_cdev; |
86166b7b JK |
634 | |
635 | cdev_init(&hidraw_cdev, &hidraw_ops); | |
bcb4a75b AK |
636 | result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); |
637 | if (result < 0) | |
638 | goto error_class; | |
639 | ||
b05cec61 | 640 | pr_info("raw HID events driver (C) Jiri Kosina\n"); |
86166b7b JK |
641 | out: |
642 | return result; | |
bcb4a75b AK |
643 | |
644 | error_class: | |
32944855 | 645 | class_unregister(&hidraw_class); |
bcb4a75b AK |
646 | error_cdev: |
647 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); | |
648 | goto out; | |
86166b7b JK |
649 | } |
650 | ||
140ae3eb | 651 | void hidraw_exit(void) |
86166b7b JK |
652 | { |
653 | dev_t dev_id = MKDEV(hidraw_major, 0); | |
654 | ||
655 | cdev_del(&hidraw_cdev); | |
32944855 | 656 | class_unregister(&hidraw_class); |
86166b7b JK |
657 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); |
658 | ||
659 | } |