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1 | /* |
2 | * Copyright (c) 2016, Linaro Ltd. | |
3 | * Copyright (c) 2012, Michal Simek <monstr@monstr.eu> | |
4 | * Copyright (c) 2012, PetaLogix | |
5 | * Copyright (c) 2011, Texas Instruments, Inc. | |
6 | * Copyright (c) 2011, Google, Inc. | |
7 | * | |
8 | * Based on rpmsg performance statistics driver by Michal Simek, which in turn | |
9 | * was based on TI & Google OMX rpmsg driver. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 and | |
13 | * only version 2 as published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | */ | |
20 | #include <linux/cdev.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/fs.h> | |
23 | #include <linux/idr.h> | |
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/poll.h> | |
27 | #include <linux/rpmsg.h> | |
28 | #include <linux/skbuff.h> | |
29 | #include <linux/slab.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <uapi/linux/rpmsg.h> | |
32 | ||
33 | #include "rpmsg_internal.h" | |
34 | ||
35 | #define RPMSG_DEV_MAX (MINORMASK + 1) | |
36 | ||
37 | static dev_t rpmsg_major; | |
38 | static struct class *rpmsg_class; | |
39 | ||
40 | static DEFINE_IDA(rpmsg_ctrl_ida); | |
41 | static DEFINE_IDA(rpmsg_ept_ida); | |
42 | static DEFINE_IDA(rpmsg_minor_ida); | |
43 | ||
44 | #define dev_to_eptdev(dev) container_of(dev, struct rpmsg_eptdev, dev) | |
45 | #define cdev_to_eptdev(i_cdev) container_of(i_cdev, struct rpmsg_eptdev, cdev) | |
46 | ||
47 | #define dev_to_ctrldev(dev) container_of(dev, struct rpmsg_ctrldev, dev) | |
48 | #define cdev_to_ctrldev(i_cdev) container_of(i_cdev, struct rpmsg_ctrldev, cdev) | |
49 | ||
50 | /** | |
51 | * struct rpmsg_ctrldev - control device for instantiating endpoint devices | |
52 | * @rpdev: underlaying rpmsg device | |
53 | * @cdev: cdev for the ctrl device | |
54 | * @dev: device for the ctrl device | |
55 | */ | |
56 | struct rpmsg_ctrldev { | |
57 | struct rpmsg_device *rpdev; | |
58 | struct cdev cdev; | |
59 | struct device dev; | |
60 | }; | |
61 | ||
62 | /** | |
63 | * struct rpmsg_eptdev - endpoint device context | |
64 | * @dev: endpoint device | |
65 | * @cdev: cdev for the endpoint device | |
66 | * @rpdev: underlaying rpmsg device | |
67 | * @chinfo: info used to open the endpoint | |
68 | * @ept_lock: synchronization of @ept modifications | |
69 | * @ept: rpmsg endpoint reference, when open | |
70 | * @queue_lock: synchronization of @queue operations | |
71 | * @queue: incoming message queue | |
72 | * @readq: wait object for incoming queue | |
73 | */ | |
74 | struct rpmsg_eptdev { | |
75 | struct device dev; | |
76 | struct cdev cdev; | |
77 | ||
78 | struct rpmsg_device *rpdev; | |
79 | struct rpmsg_channel_info chinfo; | |
80 | ||
81 | struct mutex ept_lock; | |
82 | struct rpmsg_endpoint *ept; | |
83 | ||
84 | spinlock_t queue_lock; | |
85 | struct sk_buff_head queue; | |
86 | wait_queue_head_t readq; | |
87 | }; | |
88 | ||
89 | static int rpmsg_eptdev_destroy(struct device *dev, void *data) | |
90 | { | |
91 | struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev); | |
92 | ||
93 | mutex_lock(&eptdev->ept_lock); | |
94 | if (eptdev->ept) { | |
95 | rpmsg_destroy_ept(eptdev->ept); | |
96 | eptdev->ept = NULL; | |
97 | } | |
98 | mutex_unlock(&eptdev->ept_lock); | |
99 | ||
100 | /* wake up any blocked readers */ | |
101 | wake_up_interruptible(&eptdev->readq); | |
102 | ||
103 | device_del(&eptdev->dev); | |
104 | put_device(&eptdev->dev); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len, | |
110 | void *priv, u32 addr) | |
111 | { | |
112 | struct rpmsg_eptdev *eptdev = priv; | |
113 | struct sk_buff *skb; | |
114 | ||
115 | skb = alloc_skb(len, GFP_ATOMIC); | |
116 | if (!skb) | |
117 | return -ENOMEM; | |
118 | ||
59ae1d12 | 119 | skb_put_data(skb, buf, len); |
c0cdc19f BA |
120 | |
121 | spin_lock(&eptdev->queue_lock); | |
122 | skb_queue_tail(&eptdev->queue, skb); | |
123 | spin_unlock(&eptdev->queue_lock); | |
124 | ||
125 | /* wake up any blocking processes, waiting for new data */ | |
126 | wake_up_interruptible(&eptdev->readq); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) | |
132 | { | |
133 | struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev); | |
134 | struct rpmsg_endpoint *ept; | |
135 | struct rpmsg_device *rpdev = eptdev->rpdev; | |
136 | struct device *dev = &eptdev->dev; | |
137 | ||
138 | get_device(dev); | |
139 | ||
140 | ept = rpmsg_create_ept(rpdev, rpmsg_ept_cb, eptdev, eptdev->chinfo); | |
141 | if (!ept) { | |
142 | dev_err(dev, "failed to open %s\n", eptdev->chinfo.name); | |
143 | put_device(dev); | |
144 | return -EINVAL; | |
145 | } | |
146 | ||
147 | eptdev->ept = ept; | |
148 | filp->private_data = eptdev; | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static int rpmsg_eptdev_release(struct inode *inode, struct file *filp) | |
154 | { | |
155 | struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev); | |
156 | struct device *dev = &eptdev->dev; | |
157 | struct sk_buff *skb; | |
158 | ||
159 | /* Close the endpoint, if it's not already destroyed by the parent */ | |
160 | mutex_lock(&eptdev->ept_lock); | |
161 | if (eptdev->ept) { | |
162 | rpmsg_destroy_ept(eptdev->ept); | |
163 | eptdev->ept = NULL; | |
164 | } | |
165 | mutex_unlock(&eptdev->ept_lock); | |
166 | ||
167 | /* Discard all SKBs */ | |
168 | while (!skb_queue_empty(&eptdev->queue)) { | |
169 | skb = skb_dequeue(&eptdev->queue); | |
170 | kfree_skb(skb); | |
171 | } | |
172 | ||
173 | put_device(dev); | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static ssize_t rpmsg_eptdev_read(struct file *filp, char __user *buf, | |
179 | size_t len, loff_t *f_pos) | |
180 | { | |
181 | struct rpmsg_eptdev *eptdev = filp->private_data; | |
182 | unsigned long flags; | |
183 | struct sk_buff *skb; | |
184 | int use; | |
185 | ||
186 | if (!eptdev->ept) | |
187 | return -EPIPE; | |
188 | ||
189 | spin_lock_irqsave(&eptdev->queue_lock, flags); | |
190 | ||
191 | /* Wait for data in the queue */ | |
192 | if (skb_queue_empty(&eptdev->queue)) { | |
193 | spin_unlock_irqrestore(&eptdev->queue_lock, flags); | |
194 | ||
195 | if (filp->f_flags & O_NONBLOCK) | |
196 | return -EAGAIN; | |
197 | ||
198 | /* Wait until we get data or the endpoint goes away */ | |
199 | if (wait_event_interruptible(eptdev->readq, | |
200 | !skb_queue_empty(&eptdev->queue) || | |
201 | !eptdev->ept)) | |
202 | return -ERESTARTSYS; | |
203 | ||
204 | /* We lost the endpoint while waiting */ | |
205 | if (!eptdev->ept) | |
206 | return -EPIPE; | |
207 | ||
208 | spin_lock_irqsave(&eptdev->queue_lock, flags); | |
209 | } | |
210 | ||
211 | skb = skb_dequeue(&eptdev->queue); | |
0abd6bdd | 212 | spin_unlock_irqrestore(&eptdev->queue_lock, flags); |
c0cdc19f BA |
213 | if (!skb) |
214 | return -EFAULT; | |
215 | ||
c0cdc19f BA |
216 | use = min_t(size_t, len, skb->len); |
217 | if (copy_to_user(buf, skb->data, use)) | |
218 | use = -EFAULT; | |
219 | ||
220 | kfree_skb(skb); | |
221 | ||
222 | return use; | |
223 | } | |
224 | ||
225 | static ssize_t rpmsg_eptdev_write(struct file *filp, const char __user *buf, | |
226 | size_t len, loff_t *f_pos) | |
227 | { | |
228 | struct rpmsg_eptdev *eptdev = filp->private_data; | |
229 | void *kbuf; | |
230 | int ret; | |
231 | ||
232 | kbuf = memdup_user(buf, len); | |
233 | if (IS_ERR(kbuf)) | |
234 | return PTR_ERR(kbuf); | |
235 | ||
236 | if (mutex_lock_interruptible(&eptdev->ept_lock)) { | |
237 | ret = -ERESTARTSYS; | |
238 | goto free_kbuf; | |
239 | } | |
240 | ||
241 | if (!eptdev->ept) { | |
242 | ret = -EPIPE; | |
243 | goto unlock_eptdev; | |
244 | } | |
245 | ||
246 | if (filp->f_flags & O_NONBLOCK) | |
247 | ret = rpmsg_trysend(eptdev->ept, kbuf, len); | |
248 | else | |
249 | ret = rpmsg_send(eptdev->ept, kbuf, len); | |
250 | ||
251 | unlock_eptdev: | |
252 | mutex_unlock(&eptdev->ept_lock); | |
253 | ||
254 | free_kbuf: | |
255 | kfree(kbuf); | |
256 | return ret < 0 ? ret : len; | |
257 | } | |
258 | ||
259 | static unsigned int rpmsg_eptdev_poll(struct file *filp, poll_table *wait) | |
260 | { | |
261 | struct rpmsg_eptdev *eptdev = filp->private_data; | |
262 | unsigned int mask = 0; | |
263 | ||
264 | if (!eptdev->ept) | |
265 | return POLLERR; | |
266 | ||
267 | poll_wait(filp, &eptdev->readq, wait); | |
268 | ||
269 | if (!skb_queue_empty(&eptdev->queue)) | |
270 | mask |= POLLIN | POLLRDNORM; | |
271 | ||
272 | mask |= rpmsg_poll(eptdev->ept, filp, wait); | |
273 | ||
274 | return mask; | |
275 | } | |
276 | ||
277 | static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd, | |
278 | unsigned long arg) | |
279 | { | |
280 | struct rpmsg_eptdev *eptdev = fp->private_data; | |
281 | ||
282 | if (cmd != RPMSG_DESTROY_EPT_IOCTL) | |
283 | return -EINVAL; | |
284 | ||
285 | return rpmsg_eptdev_destroy(&eptdev->dev, NULL); | |
286 | } | |
287 | ||
288 | static const struct file_operations rpmsg_eptdev_fops = { | |
289 | .owner = THIS_MODULE, | |
290 | .open = rpmsg_eptdev_open, | |
291 | .release = rpmsg_eptdev_release, | |
292 | .read = rpmsg_eptdev_read, | |
293 | .write = rpmsg_eptdev_write, | |
294 | .poll = rpmsg_eptdev_poll, | |
295 | .unlocked_ioctl = rpmsg_eptdev_ioctl, | |
296 | }; | |
297 | ||
298 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
299 | char *buf) | |
300 | { | |
301 | struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); | |
302 | ||
303 | return sprintf(buf, "%s\n", eptdev->chinfo.name); | |
304 | } | |
305 | static DEVICE_ATTR_RO(name); | |
306 | ||
307 | static ssize_t src_show(struct device *dev, struct device_attribute *attr, | |
308 | char *buf) | |
309 | { | |
310 | struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); | |
311 | ||
312 | return sprintf(buf, "%d\n", eptdev->chinfo.src); | |
313 | } | |
314 | static DEVICE_ATTR_RO(src); | |
315 | ||
316 | static ssize_t dst_show(struct device *dev, struct device_attribute *attr, | |
317 | char *buf) | |
318 | { | |
319 | struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); | |
320 | ||
321 | return sprintf(buf, "%d\n", eptdev->chinfo.dst); | |
322 | } | |
323 | static DEVICE_ATTR_RO(dst); | |
324 | ||
325 | static struct attribute *rpmsg_eptdev_attrs[] = { | |
326 | &dev_attr_name.attr, | |
327 | &dev_attr_src.attr, | |
328 | &dev_attr_dst.attr, | |
329 | NULL | |
330 | }; | |
331 | ATTRIBUTE_GROUPS(rpmsg_eptdev); | |
332 | ||
333 | static void rpmsg_eptdev_release_device(struct device *dev) | |
334 | { | |
335 | struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev); | |
336 | ||
337 | ida_simple_remove(&rpmsg_ept_ida, dev->id); | |
338 | ida_simple_remove(&rpmsg_minor_ida, MINOR(eptdev->dev.devt)); | |
339 | cdev_del(&eptdev->cdev); | |
340 | kfree(eptdev); | |
341 | } | |
342 | ||
343 | static int rpmsg_eptdev_create(struct rpmsg_ctrldev *ctrldev, | |
344 | struct rpmsg_channel_info chinfo) | |
345 | { | |
346 | struct rpmsg_device *rpdev = ctrldev->rpdev; | |
347 | struct rpmsg_eptdev *eptdev; | |
348 | struct device *dev; | |
349 | int ret; | |
350 | ||
351 | eptdev = kzalloc(sizeof(*eptdev), GFP_KERNEL); | |
352 | if (!eptdev) | |
353 | return -ENOMEM; | |
354 | ||
355 | dev = &eptdev->dev; | |
356 | eptdev->rpdev = rpdev; | |
357 | eptdev->chinfo = chinfo; | |
358 | ||
359 | mutex_init(&eptdev->ept_lock); | |
360 | spin_lock_init(&eptdev->queue_lock); | |
361 | skb_queue_head_init(&eptdev->queue); | |
362 | init_waitqueue_head(&eptdev->readq); | |
363 | ||
364 | device_initialize(dev); | |
365 | dev->class = rpmsg_class; | |
366 | dev->parent = &ctrldev->dev; | |
367 | dev->groups = rpmsg_eptdev_groups; | |
368 | dev_set_drvdata(dev, eptdev); | |
369 | ||
370 | cdev_init(&eptdev->cdev, &rpmsg_eptdev_fops); | |
371 | eptdev->cdev.owner = THIS_MODULE; | |
372 | ||
373 | ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); | |
374 | if (ret < 0) | |
375 | goto free_eptdev; | |
376 | dev->devt = MKDEV(MAJOR(rpmsg_major), ret); | |
377 | ||
378 | ret = ida_simple_get(&rpmsg_ept_ida, 0, 0, GFP_KERNEL); | |
379 | if (ret < 0) | |
380 | goto free_minor_ida; | |
381 | dev->id = ret; | |
382 | dev_set_name(dev, "rpmsg%d", ret); | |
383 | ||
384 | ret = cdev_add(&eptdev->cdev, dev->devt, 1); | |
385 | if (ret) | |
386 | goto free_ept_ida; | |
387 | ||
388 | /* We can now rely on the release function for cleanup */ | |
389 | dev->release = rpmsg_eptdev_release_device; | |
390 | ||
391 | ret = device_add(dev); | |
392 | if (ret) { | |
f6175294 | 393 | dev_err(dev, "device_add failed: %d\n", ret); |
c0cdc19f BA |
394 | put_device(dev); |
395 | } | |
396 | ||
397 | return ret; | |
398 | ||
399 | free_ept_ida: | |
400 | ida_simple_remove(&rpmsg_ept_ida, dev->id); | |
401 | free_minor_ida: | |
402 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
403 | free_eptdev: | |
404 | put_device(dev); | |
405 | kfree(eptdev); | |
406 | ||
407 | return ret; | |
408 | } | |
409 | ||
410 | static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp) | |
411 | { | |
412 | struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); | |
413 | ||
414 | get_device(&ctrldev->dev); | |
415 | filp->private_data = ctrldev; | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | static int rpmsg_ctrldev_release(struct inode *inode, struct file *filp) | |
421 | { | |
422 | struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); | |
423 | ||
424 | put_device(&ctrldev->dev); | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd, | |
430 | unsigned long arg) | |
431 | { | |
432 | struct rpmsg_ctrldev *ctrldev = fp->private_data; | |
433 | void __user *argp = (void __user *)arg; | |
434 | struct rpmsg_endpoint_info eptinfo; | |
435 | struct rpmsg_channel_info chinfo; | |
436 | ||
437 | if (cmd != RPMSG_CREATE_EPT_IOCTL) | |
438 | return -EINVAL; | |
439 | ||
440 | if (copy_from_user(&eptinfo, argp, sizeof(eptinfo))) | |
441 | return -EFAULT; | |
442 | ||
443 | memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE); | |
444 | chinfo.name[RPMSG_NAME_SIZE-1] = '\0'; | |
445 | chinfo.src = eptinfo.src; | |
446 | chinfo.dst = eptinfo.dst; | |
447 | ||
448 | return rpmsg_eptdev_create(ctrldev, chinfo); | |
449 | }; | |
450 | ||
451 | static const struct file_operations rpmsg_ctrldev_fops = { | |
452 | .owner = THIS_MODULE, | |
453 | .open = rpmsg_ctrldev_open, | |
454 | .release = rpmsg_ctrldev_release, | |
455 | .unlocked_ioctl = rpmsg_ctrldev_ioctl, | |
456 | }; | |
457 | ||
458 | static void rpmsg_ctrldev_release_device(struct device *dev) | |
459 | { | |
460 | struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev); | |
461 | ||
462 | ida_simple_remove(&rpmsg_ctrl_ida, dev->id); | |
463 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
464 | cdev_del(&ctrldev->cdev); | |
465 | kfree(ctrldev); | |
466 | } | |
467 | ||
468 | static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev) | |
469 | { | |
470 | struct rpmsg_ctrldev *ctrldev; | |
471 | struct device *dev; | |
472 | int ret; | |
473 | ||
474 | ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL); | |
475 | if (!ctrldev) | |
476 | return -ENOMEM; | |
477 | ||
478 | ctrldev->rpdev = rpdev; | |
479 | ||
480 | dev = &ctrldev->dev; | |
481 | device_initialize(dev); | |
482 | dev->parent = &rpdev->dev; | |
483 | dev->class = rpmsg_class; | |
484 | ||
485 | cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops); | |
486 | ctrldev->cdev.owner = THIS_MODULE; | |
487 | ||
488 | ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); | |
489 | if (ret < 0) | |
490 | goto free_ctrldev; | |
491 | dev->devt = MKDEV(MAJOR(rpmsg_major), ret); | |
492 | ||
493 | ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL); | |
494 | if (ret < 0) | |
495 | goto free_minor_ida; | |
496 | dev->id = ret; | |
497 | dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret); | |
498 | ||
499 | ret = cdev_add(&ctrldev->cdev, dev->devt, 1); | |
500 | if (ret) | |
501 | goto free_ctrl_ida; | |
502 | ||
503 | /* We can now rely on the release function for cleanup */ | |
504 | dev->release = rpmsg_ctrldev_release_device; | |
505 | ||
506 | ret = device_add(dev); | |
507 | if (ret) { | |
f6175294 | 508 | dev_err(&rpdev->dev, "device_add failed: %d\n", ret); |
c0cdc19f BA |
509 | put_device(dev); |
510 | } | |
511 | ||
512 | dev_set_drvdata(&rpdev->dev, ctrldev); | |
513 | ||
514 | return ret; | |
515 | ||
516 | free_ctrl_ida: | |
517 | ida_simple_remove(&rpmsg_ctrl_ida, dev->id); | |
518 | free_minor_ida: | |
519 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
520 | free_ctrldev: | |
521 | put_device(dev); | |
522 | kfree(ctrldev); | |
523 | ||
524 | return ret; | |
525 | } | |
526 | ||
527 | static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev) | |
528 | { | |
529 | struct rpmsg_ctrldev *ctrldev = dev_get_drvdata(&rpdev->dev); | |
530 | int ret; | |
531 | ||
532 | /* Destroy all endpoints */ | |
533 | ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_eptdev_destroy); | |
534 | if (ret) | |
535 | dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret); | |
536 | ||
537 | device_del(&ctrldev->dev); | |
538 | put_device(&ctrldev->dev); | |
539 | } | |
540 | ||
541 | static struct rpmsg_driver rpmsg_chrdev_driver = { | |
542 | .probe = rpmsg_chrdev_probe, | |
543 | .remove = rpmsg_chrdev_remove, | |
544 | .drv = { | |
545 | .name = "rpmsg_chrdev", | |
546 | }, | |
547 | }; | |
548 | ||
549 | static int rpmsg_char_init(void) | |
550 | { | |
551 | int ret; | |
552 | ||
553 | ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg"); | |
554 | if (ret < 0) { | |
555 | pr_err("rpmsg: failed to allocate char dev region\n"); | |
556 | return ret; | |
557 | } | |
558 | ||
559 | rpmsg_class = class_create(THIS_MODULE, "rpmsg"); | |
560 | if (IS_ERR(rpmsg_class)) { | |
561 | pr_err("failed to create rpmsg class\n"); | |
562 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
563 | return PTR_ERR(rpmsg_class); | |
564 | } | |
565 | ||
566 | ret = register_rpmsg_driver(&rpmsg_chrdev_driver); | |
567 | if (ret < 0) { | |
568 | pr_err("rpmsgchr: failed to register rpmsg driver\n"); | |
569 | class_destroy(rpmsg_class); | |
570 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
571 | } | |
572 | ||
573 | return ret; | |
574 | } | |
575 | postcore_initcall(rpmsg_char_init); | |
576 | ||
577 | static void rpmsg_chrdev_exit(void) | |
578 | { | |
579 | unregister_rpmsg_driver(&rpmsg_chrdev_driver); | |
580 | class_destroy(rpmsg_class); | |
581 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
582 | } | |
583 | module_exit(rpmsg_chrdev_exit); | |
57c477ea RF |
584 | |
585 | MODULE_ALIAS("rpmsg:rpmsg_chrdev"); | |
c0cdc19f | 586 | MODULE_LICENSE("GPL v2"); |