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 | * | |
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 | ||
22 | #include <linux/fs.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/errno.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/init.h> | |
27 | #include <linux/cdev.h> | |
28 | #include <linux/poll.h> | |
29 | #include <linux/device.h> | |
30 | #include <linux/major.h> | |
31 | #include <linux/hid.h> | |
32 | #include <linux/mutex.h> | |
a99bbaf5 | 33 | #include <linux/sched.h> |
702e57d9 | 34 | #include <linux/smp_lock.h> |
86166b7b JK |
35 | |
36 | #include <linux/hidraw.h> | |
37 | ||
38 | static int hidraw_major; | |
39 | static struct cdev hidraw_cdev; | |
40 | static struct class *hidraw_class; | |
41 | static struct hidraw *hidraw_table[HIDRAW_MAX_DEVICES]; | |
7d672cd7 | 42 | static DEFINE_MUTEX(minors_lock); |
86166b7b JK |
43 | |
44 | static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) | |
45 | { | |
46 | struct hidraw_list *list = file->private_data; | |
47 | int ret = 0, len; | |
48 | char *report; | |
49 | DECLARE_WAITQUEUE(wait, current); | |
50 | ||
51 | while (ret == 0) { | |
52 | ||
53 | mutex_lock(&list->read_mutex); | |
54 | ||
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 | ||
87 | report = list->buffer[list->tail].value; | |
88 | len = list->buffer[list->tail].len > count ? | |
89 | count : list->buffer[list->tail].len; | |
90 | ||
91 | if (copy_to_user(buffer, list->buffer[list->tail].value, len)) { | |
92 | ret = -EFAULT; | |
93 | goto out; | |
94 | } | |
95 | ret += len; | |
96 | ||
97 | kfree(list->buffer[list->tail].value); | |
98 | list->tail = (list->tail + 1) & (HIDRAW_BUFFER_SIZE - 1); | |
99 | } | |
100 | out: | |
101 | mutex_unlock(&list->read_mutex); | |
102 | return ret; | |
103 | } | |
104 | ||
105 | /* the first byte is expected to be a report number */ | |
106 | static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) | |
107 | { | |
108 | unsigned int minor = iminor(file->f_path.dentry->d_inode); | |
979c407e | 109 | /* FIXME: What stops hidraw_table going NULL */ |
86166b7b JK |
110 | struct hid_device *dev = hidraw_table[minor]->hid; |
111 | __u8 *buf; | |
112 | int ret = 0; | |
113 | ||
114 | if (!dev->hid_output_raw_report) | |
115 | return -ENODEV; | |
116 | ||
2b107d62 | 117 | if (count > HID_MAX_BUFFER_SIZE) { |
86166b7b | 118 | printk(KERN_WARNING "hidraw: pid %d passed too large report\n", |
ba25f9dc | 119 | task_pid_nr(current)); |
86166b7b JK |
120 | return -EINVAL; |
121 | } | |
122 | ||
123 | if (count < 2) { | |
124 | printk(KERN_WARNING "hidraw: pid %d passed too short report\n", | |
ba25f9dc | 125 | task_pid_nr(current)); |
86166b7b JK |
126 | return -EINVAL; |
127 | } | |
128 | ||
129 | buf = kmalloc(count * sizeof(__u8), GFP_KERNEL); | |
130 | if (!buf) | |
131 | return -ENOMEM; | |
132 | ||
133 | if (copy_from_user(buf, buffer, count)) { | |
134 | ret = -EFAULT; | |
135 | goto out; | |
136 | } | |
137 | ||
138 | ret = dev->hid_output_raw_report(dev, buf, count); | |
139 | out: | |
140 | kfree(buf); | |
141 | return ret; | |
142 | } | |
143 | ||
144 | static unsigned int hidraw_poll(struct file *file, poll_table *wait) | |
145 | { | |
146 | struct hidraw_list *list = file->private_data; | |
147 | ||
148 | poll_wait(file, &list->hidraw->wait, wait); | |
149 | if (list->head != list->tail) | |
150 | return POLLIN | POLLRDNORM; | |
151 | if (!list->hidraw->exist) | |
152 | return POLLERR | POLLHUP; | |
153 | return 0; | |
154 | } | |
155 | ||
156 | static int hidraw_open(struct inode *inode, struct file *file) | |
157 | { | |
158 | unsigned int minor = iminor(inode); | |
159 | struct hidraw *dev; | |
160 | struct hidraw_list *list; | |
161 | int err = 0; | |
162 | ||
163 | if (!(list = kzalloc(sizeof(struct hidraw_list), GFP_KERNEL))) { | |
164 | err = -ENOMEM; | |
165 | goto out; | |
166 | } | |
167 | ||
7d672cd7 ON |
168 | lock_kernel(); |
169 | mutex_lock(&minors_lock); | |
86166b7b JK |
170 | if (!hidraw_table[minor]) { |
171 | printk(KERN_EMERG "hidraw device with minor %d doesn't exist\n", | |
172 | minor); | |
173 | kfree(list); | |
174 | err = -ENODEV; | |
175 | goto out_unlock; | |
176 | } | |
177 | ||
178 | list->hidraw = hidraw_table[minor]; | |
179 | mutex_init(&list->read_mutex); | |
180 | list_add_tail(&list->node, &hidraw_table[minor]->list); | |
181 | file->private_data = list; | |
182 | ||
183 | dev = hidraw_table[minor]; | |
7d672cd7 | 184 | if (!dev->open++) { |
0361a28d ON |
185 | if (dev->hid->ll_driver->power) { |
186 | err = dev->hid->ll_driver->power(dev->hid, PM_HINT_FULLON); | |
187 | if (err < 0) | |
188 | goto out_unlock; | |
189 | } | |
7d672cd7 | 190 | err = dev->hid->ll_driver->open(dev->hid); |
0361a28d ON |
191 | if (err < 0) { |
192 | if (dev->hid->ll_driver->power) | |
193 | dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL); | |
7d672cd7 | 194 | dev->open--; |
0361a28d | 195 | } |
7d672cd7 | 196 | } |
86166b7b JK |
197 | |
198 | out_unlock: | |
7d672cd7 | 199 | mutex_unlock(&minors_lock); |
702e57d9 | 200 | unlock_kernel(); |
7d672cd7 | 201 | out: |
86166b7b JK |
202 | return err; |
203 | ||
204 | } | |
205 | ||
206 | static int hidraw_release(struct inode * inode, struct file * file) | |
207 | { | |
208 | unsigned int minor = iminor(inode); | |
209 | struct hidraw *dev; | |
210 | struct hidraw_list *list = file->private_data; | |
211 | ||
212 | if (!hidraw_table[minor]) { | |
213 | printk(KERN_EMERG "hidraw device with minor %d doesn't exist\n", | |
214 | minor); | |
215 | return -ENODEV; | |
216 | } | |
217 | ||
218 | list_del(&list->node); | |
219 | dev = hidraw_table[minor]; | |
b8a832b1 | 220 | if (!--dev->open) { |
0361a28d ON |
221 | if (list->hidraw->exist) { |
222 | if (dev->hid->ll_driver->power) | |
223 | dev->hid->ll_driver->power(dev->hid, PM_HINT_NORMAL); | |
c500c971 | 224 | dev->hid->ll_driver->close(dev->hid); |
0361a28d | 225 | } else { |
86166b7b | 226 | kfree(list->hidraw); |
0361a28d | 227 | } |
86166b7b JK |
228 | } |
229 | ||
4db1c62c JK |
230 | kfree(list); |
231 | ||
86166b7b JK |
232 | return 0; |
233 | } | |
234 | ||
979c407e AC |
235 | static long hidraw_ioctl(struct file *file, unsigned int cmd, |
236 | unsigned long arg) | |
86166b7b | 237 | { |
979c407e | 238 | struct inode *inode = file->f_path.dentry->d_inode; |
86166b7b | 239 | unsigned int minor = iminor(inode); |
979c407e AC |
240 | long ret = 0; |
241 | /* FIXME: What stops hidraw_table going NULL */ | |
86166b7b JK |
242 | struct hidraw *dev = hidraw_table[minor]; |
243 | void __user *user_arg = (void __user*) arg; | |
244 | ||
979c407e | 245 | lock_kernel(); |
86166b7b JK |
246 | switch (cmd) { |
247 | case HIDIOCGRDESCSIZE: | |
248 | if (put_user(dev->hid->rsize, (int __user *)arg)) | |
979c407e AC |
249 | ret = -EFAULT; |
250 | break; | |
86166b7b JK |
251 | |
252 | case HIDIOCGRDESC: | |
253 | { | |
254 | __u32 len; | |
255 | ||
256 | if (get_user(len, (int __user *)arg)) | |
979c407e AC |
257 | ret = -EFAULT; |
258 | else if (len > HID_MAX_DESCRIPTOR_SIZE - 1) | |
259 | ret = -EINVAL; | |
260 | else if (copy_to_user(user_arg + offsetof( | |
261 | struct hidraw_report_descriptor, | |
262 | value[0]), | |
263 | dev->hid->rdesc, | |
264 | min(dev->hid->rsize, len))) | |
265 | ret = -EFAULT; | |
266 | break; | |
86166b7b JK |
267 | } |
268 | case HIDIOCGRAWINFO: | |
269 | { | |
270 | struct hidraw_devinfo dinfo; | |
271 | ||
272 | dinfo.bustype = dev->hid->bus; | |
273 | dinfo.vendor = dev->hid->vendor; | |
274 | dinfo.product = dev->hid->product; | |
275 | if (copy_to_user(user_arg, &dinfo, sizeof(dinfo))) | |
979c407e AC |
276 | ret = -EFAULT; |
277 | break; | |
86166b7b JK |
278 | } |
279 | default: | |
9188e79e JK |
280 | { |
281 | struct hid_device *hid = dev->hid; | |
dfd395af DC |
282 | if (_IOC_TYPE(cmd) != 'H' || _IOC_DIR(cmd) != _IOC_READ) { |
283 | ret = -EINVAL; | |
284 | break; | |
285 | } | |
9188e79e JK |
286 | |
287 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWNAME(0))) { | |
288 | int len; | |
38089c65 DC |
289 | if (!hid->name) { |
290 | ret = 0; | |
291 | break; | |
292 | } | |
9188e79e JK |
293 | len = strlen(hid->name) + 1; |
294 | if (len > _IOC_SIZE(cmd)) | |
295 | len = _IOC_SIZE(cmd); | |
dfd395af | 296 | ret = copy_to_user(user_arg, hid->name, len) ? |
9188e79e | 297 | -EFAULT : len; |
dfd395af | 298 | break; |
9188e79e JK |
299 | } |
300 | ||
301 | if (_IOC_NR(cmd) == _IOC_NR(HIDIOCGRAWPHYS(0))) { | |
302 | int len; | |
38089c65 DC |
303 | if (!hid->phys) { |
304 | ret = 0; | |
305 | break; | |
306 | } | |
9188e79e JK |
307 | len = strlen(hid->phys) + 1; |
308 | if (len > _IOC_SIZE(cmd)) | |
309 | len = _IOC_SIZE(cmd); | |
dfd395af | 310 | ret = copy_to_user(user_arg, hid->phys, len) ? |
9188e79e | 311 | -EFAULT : len; |
dfd395af | 312 | break; |
9188e79e JK |
313 | } |
314 | } | |
315 | ||
dfd395af | 316 | ret = -ENOTTY; |
86166b7b | 317 | } |
0f2c5945 | 318 | unlock_kernel(); |
979c407e | 319 | return ret; |
86166b7b JK |
320 | } |
321 | ||
322 | static const struct file_operations hidraw_ops = { | |
323 | .owner = THIS_MODULE, | |
324 | .read = hidraw_read, | |
325 | .write = hidraw_write, | |
326 | .poll = hidraw_poll, | |
327 | .open = hidraw_open, | |
328 | .release = hidraw_release, | |
979c407e | 329 | .unlocked_ioctl = hidraw_ioctl, |
86166b7b JK |
330 | }; |
331 | ||
332 | void hidraw_report_event(struct hid_device *hid, u8 *data, int len) | |
333 | { | |
334 | struct hidraw *dev = hid->hidraw; | |
335 | struct hidraw_list *list; | |
336 | ||
337 | list_for_each_entry(list, &dev->list, node) { | |
338 | list->buffer[list->head].value = kmemdup(data, len, GFP_ATOMIC); | |
339 | list->buffer[list->head].len = len; | |
340 | list->head = (list->head + 1) & (HIDRAW_BUFFER_SIZE - 1); | |
341 | kill_fasync(&list->fasync, SIGIO, POLL_IN); | |
342 | } | |
343 | ||
344 | wake_up_interruptible(&dev->wait); | |
345 | } | |
346 | EXPORT_SYMBOL_GPL(hidraw_report_event); | |
347 | ||
348 | int hidraw_connect(struct hid_device *hid) | |
349 | { | |
709d27c0 | 350 | int minor, result; |
86166b7b JK |
351 | struct hidraw *dev; |
352 | ||
bbe281fa | 353 | /* we accept any HID device, no matter the applications */ |
86166b7b | 354 | |
709d27c0 MK |
355 | dev = kzalloc(sizeof(struct hidraw), GFP_KERNEL); |
356 | if (!dev) | |
357 | return -ENOMEM; | |
358 | ||
359 | result = -EINVAL; | |
86166b7b | 360 | |
7d672cd7 | 361 | mutex_lock(&minors_lock); |
86166b7b JK |
362 | |
363 | for (minor = 0; minor < HIDRAW_MAX_DEVICES; minor++) { | |
364 | if (hidraw_table[minor]) | |
365 | continue; | |
366 | hidraw_table[minor] = dev; | |
367 | result = 0; | |
368 | break; | |
369 | } | |
370 | ||
709d27c0 | 371 | if (result) { |
7d672cd7 | 372 | mutex_unlock(&minors_lock); |
709d27c0 | 373 | kfree(dev); |
86166b7b | 374 | goto out; |
709d27c0 | 375 | } |
86166b7b | 376 | |
aae6c286 | 377 | dev->dev = device_create(hidraw_class, &hid->dev, MKDEV(hidraw_major, minor), |
a9b12619 | 378 | NULL, "%s%d", "hidraw", minor); |
86166b7b JK |
379 | |
380 | if (IS_ERR(dev->dev)) { | |
86166b7b | 381 | hidraw_table[minor] = NULL; |
7d672cd7 | 382 | mutex_unlock(&minors_lock); |
86166b7b | 383 | result = PTR_ERR(dev->dev); |
709d27c0 | 384 | kfree(dev); |
86166b7b JK |
385 | goto out; |
386 | } | |
387 | ||
7d672cd7 | 388 | mutex_unlock(&minors_lock); |
86166b7b JK |
389 | init_waitqueue_head(&dev->wait); |
390 | INIT_LIST_HEAD(&dev->list); | |
391 | ||
392 | dev->hid = hid; | |
393 | dev->minor = minor; | |
394 | ||
395 | dev->exist = 1; | |
396 | hid->hidraw = dev; | |
397 | ||
398 | out: | |
399 | return result; | |
400 | ||
401 | } | |
402 | EXPORT_SYMBOL_GPL(hidraw_connect); | |
403 | ||
404 | void hidraw_disconnect(struct hid_device *hid) | |
405 | { | |
406 | struct hidraw *hidraw = hid->hidraw; | |
407 | ||
408 | hidraw->exist = 0; | |
409 | ||
7d672cd7 | 410 | mutex_lock(&minors_lock); |
86166b7b | 411 | hidraw_table[hidraw->minor] = NULL; |
7d672cd7 | 412 | mutex_unlock(&minors_lock); |
86166b7b JK |
413 | |
414 | device_destroy(hidraw_class, MKDEV(hidraw_major, hidraw->minor)); | |
415 | ||
416 | if (hidraw->open) { | |
c500c971 | 417 | hid->ll_driver->close(hid); |
86166b7b JK |
418 | wake_up_interruptible(&hidraw->wait); |
419 | } else { | |
420 | kfree(hidraw); | |
421 | } | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(hidraw_disconnect); | |
424 | ||
425 | int __init hidraw_init(void) | |
426 | { | |
427 | int result; | |
428 | dev_t dev_id; | |
429 | ||
430 | result = alloc_chrdev_region(&dev_id, HIDRAW_FIRST_MINOR, | |
431 | HIDRAW_MAX_DEVICES, "hidraw"); | |
432 | ||
433 | hidraw_major = MAJOR(dev_id); | |
434 | ||
435 | if (result < 0) { | |
436 | printk(KERN_WARNING "hidraw: can't get major number\n"); | |
437 | result = 0; | |
438 | goto out; | |
439 | } | |
440 | ||
441 | hidraw_class = class_create(THIS_MODULE, "hidraw"); | |
442 | if (IS_ERR(hidraw_class)) { | |
443 | result = PTR_ERR(hidraw_class); | |
444 | unregister_chrdev(hidraw_major, "hidraw"); | |
445 | goto out; | |
446 | } | |
447 | ||
448 | cdev_init(&hidraw_cdev, &hidraw_ops); | |
449 | cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES); | |
450 | out: | |
451 | return result; | |
452 | } | |
453 | ||
140ae3eb | 454 | void hidraw_exit(void) |
86166b7b JK |
455 | { |
456 | dev_t dev_id = MKDEV(hidraw_major, 0); | |
457 | ||
458 | cdev_del(&hidraw_cdev); | |
459 | class_destroy(hidraw_class); | |
460 | unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES); | |
461 | ||
462 | } |