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136200f4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
c0cdc19f BA |
2 | /* |
3 | * Copyright (c) 2016, Linaro Ltd. | |
4 | * Copyright (c) 2012, Michal Simek <monstr@monstr.eu> | |
5 | * Copyright (c) 2012, PetaLogix | |
6 | * Copyright (c) 2011, Texas Instruments, Inc. | |
7 | * Copyright (c) 2011, Google, Inc. | |
8 | * | |
9 | * Based on rpmsg performance statistics driver by Michal Simek, which in turn | |
10 | * was based on TI & Google OMX rpmsg driver. | |
c0cdc19f BA |
11 | */ |
12 | #include <linux/cdev.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/fs.h> | |
15 | #include <linux/idr.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/poll.h> | |
19 | #include <linux/rpmsg.h> | |
20 | #include <linux/skbuff.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/uaccess.h> | |
23 | #include <uapi/linux/rpmsg.h> | |
24 | ||
25 | #include "rpmsg_internal.h" | |
26 | ||
27 | #define RPMSG_DEV_MAX (MINORMASK + 1) | |
28 | ||
29 | static dev_t rpmsg_major; | |
30 | static struct class *rpmsg_class; | |
31 | ||
32 | static DEFINE_IDA(rpmsg_ctrl_ida); | |
33 | static DEFINE_IDA(rpmsg_ept_ida); | |
34 | static DEFINE_IDA(rpmsg_minor_ida); | |
35 | ||
36 | #define dev_to_eptdev(dev) container_of(dev, struct rpmsg_eptdev, dev) | |
37 | #define cdev_to_eptdev(i_cdev) container_of(i_cdev, struct rpmsg_eptdev, cdev) | |
38 | ||
39 | #define dev_to_ctrldev(dev) container_of(dev, struct rpmsg_ctrldev, dev) | |
40 | #define cdev_to_ctrldev(i_cdev) container_of(i_cdev, struct rpmsg_ctrldev, cdev) | |
41 | ||
42 | /** | |
43 | * struct rpmsg_ctrldev - control device for instantiating endpoint devices | |
44 | * @rpdev: underlaying rpmsg device | |
45 | * @cdev: cdev for the ctrl device | |
46 | * @dev: device for the ctrl device | |
47 | */ | |
48 | struct rpmsg_ctrldev { | |
49 | struct rpmsg_device *rpdev; | |
50 | struct cdev cdev; | |
51 | struct device dev; | |
52 | }; | |
53 | ||
54 | /** | |
55 | * struct rpmsg_eptdev - endpoint device context | |
56 | * @dev: endpoint device | |
57 | * @cdev: cdev for the endpoint device | |
58 | * @rpdev: underlaying rpmsg device | |
59 | * @chinfo: info used to open the endpoint | |
60 | * @ept_lock: synchronization of @ept modifications | |
61 | * @ept: rpmsg endpoint reference, when open | |
62 | * @queue_lock: synchronization of @queue operations | |
63 | * @queue: incoming message queue | |
64 | * @readq: wait object for incoming queue | |
65 | */ | |
66 | struct rpmsg_eptdev { | |
67 | struct device dev; | |
68 | struct cdev cdev; | |
69 | ||
70 | struct rpmsg_device *rpdev; | |
71 | struct rpmsg_channel_info chinfo; | |
72 | ||
73 | struct mutex ept_lock; | |
74 | struct rpmsg_endpoint *ept; | |
75 | ||
76 | spinlock_t queue_lock; | |
77 | struct sk_buff_head queue; | |
78 | wait_queue_head_t readq; | |
79 | }; | |
80 | ||
81 | static int rpmsg_eptdev_destroy(struct device *dev, void *data) | |
82 | { | |
83 | struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev); | |
84 | ||
85 | mutex_lock(&eptdev->ept_lock); | |
86 | if (eptdev->ept) { | |
87 | rpmsg_destroy_ept(eptdev->ept); | |
88 | eptdev->ept = NULL; | |
89 | } | |
90 | mutex_unlock(&eptdev->ept_lock); | |
91 | ||
92 | /* wake up any blocked readers */ | |
93 | wake_up_interruptible(&eptdev->readq); | |
94 | ||
95 | device_del(&eptdev->dev); | |
96 | put_device(&eptdev->dev); | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len, | |
102 | void *priv, u32 addr) | |
103 | { | |
104 | struct rpmsg_eptdev *eptdev = priv; | |
105 | struct sk_buff *skb; | |
106 | ||
107 | skb = alloc_skb(len, GFP_ATOMIC); | |
108 | if (!skb) | |
109 | return -ENOMEM; | |
110 | ||
59ae1d12 | 111 | skb_put_data(skb, buf, len); |
c0cdc19f BA |
112 | |
113 | spin_lock(&eptdev->queue_lock); | |
114 | skb_queue_tail(&eptdev->queue, skb); | |
115 | spin_unlock(&eptdev->queue_lock); | |
116 | ||
117 | /* wake up any blocking processes, waiting for new data */ | |
118 | wake_up_interruptible(&eptdev->readq); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) | |
124 | { | |
125 | struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev); | |
126 | struct rpmsg_endpoint *ept; | |
127 | struct rpmsg_device *rpdev = eptdev->rpdev; | |
128 | struct device *dev = &eptdev->dev; | |
129 | ||
130 | get_device(dev); | |
131 | ||
132 | ept = rpmsg_create_ept(rpdev, rpmsg_ept_cb, eptdev, eptdev->chinfo); | |
133 | if (!ept) { | |
134 | dev_err(dev, "failed to open %s\n", eptdev->chinfo.name); | |
135 | put_device(dev); | |
136 | return -EINVAL; | |
137 | } | |
138 | ||
139 | eptdev->ept = ept; | |
140 | filp->private_data = eptdev; | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static int rpmsg_eptdev_release(struct inode *inode, struct file *filp) | |
146 | { | |
147 | struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev); | |
148 | struct device *dev = &eptdev->dev; | |
c0cdc19f BA |
149 | |
150 | /* Close the endpoint, if it's not already destroyed by the parent */ | |
151 | mutex_lock(&eptdev->ept_lock); | |
152 | if (eptdev->ept) { | |
153 | rpmsg_destroy_ept(eptdev->ept); | |
154 | eptdev->ept = NULL; | |
155 | } | |
156 | mutex_unlock(&eptdev->ept_lock); | |
157 | ||
158 | /* Discard all SKBs */ | |
bb06a5ce | 159 | skb_queue_purge(&eptdev->queue); |
c0cdc19f BA |
160 | |
161 | put_device(dev); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
ccf45b18 | 166 | static ssize_t rpmsg_eptdev_read_iter(struct kiocb *iocb, struct iov_iter *to) |
c0cdc19f | 167 | { |
ccf45b18 | 168 | struct file *filp = iocb->ki_filp; |
c0cdc19f BA |
169 | struct rpmsg_eptdev *eptdev = filp->private_data; |
170 | unsigned long flags; | |
171 | struct sk_buff *skb; | |
172 | int use; | |
173 | ||
174 | if (!eptdev->ept) | |
175 | return -EPIPE; | |
176 | ||
177 | spin_lock_irqsave(&eptdev->queue_lock, flags); | |
178 | ||
179 | /* Wait for data in the queue */ | |
180 | if (skb_queue_empty(&eptdev->queue)) { | |
181 | spin_unlock_irqrestore(&eptdev->queue_lock, flags); | |
182 | ||
183 | if (filp->f_flags & O_NONBLOCK) | |
184 | return -EAGAIN; | |
185 | ||
186 | /* Wait until we get data or the endpoint goes away */ | |
187 | if (wait_event_interruptible(eptdev->readq, | |
188 | !skb_queue_empty(&eptdev->queue) || | |
189 | !eptdev->ept)) | |
190 | return -ERESTARTSYS; | |
191 | ||
192 | /* We lost the endpoint while waiting */ | |
193 | if (!eptdev->ept) | |
194 | return -EPIPE; | |
195 | ||
196 | spin_lock_irqsave(&eptdev->queue_lock, flags); | |
197 | } | |
198 | ||
199 | skb = skb_dequeue(&eptdev->queue); | |
0abd6bdd | 200 | spin_unlock_irqrestore(&eptdev->queue_lock, flags); |
c0cdc19f BA |
201 | if (!skb) |
202 | return -EFAULT; | |
203 | ||
ccf45b18 BA |
204 | use = min_t(size_t, iov_iter_count(to), skb->len); |
205 | if (copy_to_iter(skb->data, use, to) != use) | |
c0cdc19f BA |
206 | use = -EFAULT; |
207 | ||
208 | kfree_skb(skb); | |
209 | ||
210 | return use; | |
211 | } | |
212 | ||
ccf45b18 BA |
213 | static ssize_t rpmsg_eptdev_write_iter(struct kiocb *iocb, |
214 | struct iov_iter *from) | |
c0cdc19f | 215 | { |
ccf45b18 | 216 | struct file *filp = iocb->ki_filp; |
c0cdc19f | 217 | struct rpmsg_eptdev *eptdev = filp->private_data; |
ccf45b18 | 218 | size_t len = iov_iter_count(from); |
c0cdc19f BA |
219 | void *kbuf; |
220 | int ret; | |
221 | ||
ccf45b18 BA |
222 | kbuf = kzalloc(len, GFP_KERNEL); |
223 | if (!kbuf) | |
224 | return -ENOMEM; | |
225 | ||
bbe692e3 NE |
226 | if (!copy_from_iter_full(kbuf, len, from)) { |
227 | ret = -EFAULT; | |
228 | goto free_kbuf; | |
229 | } | |
c0cdc19f BA |
230 | |
231 | if (mutex_lock_interruptible(&eptdev->ept_lock)) { | |
232 | ret = -ERESTARTSYS; | |
233 | goto free_kbuf; | |
234 | } | |
235 | ||
236 | if (!eptdev->ept) { | |
237 | ret = -EPIPE; | |
238 | goto unlock_eptdev; | |
239 | } | |
240 | ||
241 | if (filp->f_flags & O_NONBLOCK) | |
242 | ret = rpmsg_trysend(eptdev->ept, kbuf, len); | |
243 | else | |
244 | ret = rpmsg_send(eptdev->ept, kbuf, len); | |
245 | ||
246 | unlock_eptdev: | |
247 | mutex_unlock(&eptdev->ept_lock); | |
248 | ||
249 | free_kbuf: | |
250 | kfree(kbuf); | |
251 | return ret < 0 ? ret : len; | |
252 | } | |
253 | ||
afc9a42b | 254 | static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait) |
c0cdc19f BA |
255 | { |
256 | struct rpmsg_eptdev *eptdev = filp->private_data; | |
afc9a42b | 257 | __poll_t mask = 0; |
c0cdc19f BA |
258 | |
259 | if (!eptdev->ept) | |
a9a08845 | 260 | return EPOLLERR; |
c0cdc19f BA |
261 | |
262 | poll_wait(filp, &eptdev->readq, wait); | |
263 | ||
264 | if (!skb_queue_empty(&eptdev->queue)) | |
a9a08845 | 265 | mask |= EPOLLIN | EPOLLRDNORM; |
c0cdc19f BA |
266 | |
267 | mask |= rpmsg_poll(eptdev->ept, filp, wait); | |
268 | ||
269 | return mask; | |
270 | } | |
271 | ||
272 | static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd, | |
273 | unsigned long arg) | |
274 | { | |
275 | struct rpmsg_eptdev *eptdev = fp->private_data; | |
276 | ||
277 | if (cmd != RPMSG_DESTROY_EPT_IOCTL) | |
278 | return -EINVAL; | |
279 | ||
280 | return rpmsg_eptdev_destroy(&eptdev->dev, NULL); | |
281 | } | |
282 | ||
283 | static const struct file_operations rpmsg_eptdev_fops = { | |
284 | .owner = THIS_MODULE, | |
285 | .open = rpmsg_eptdev_open, | |
286 | .release = rpmsg_eptdev_release, | |
ccf45b18 BA |
287 | .read_iter = rpmsg_eptdev_read_iter, |
288 | .write_iter = rpmsg_eptdev_write_iter, | |
c0cdc19f BA |
289 | .poll = rpmsg_eptdev_poll, |
290 | .unlocked_ioctl = rpmsg_eptdev_ioctl, | |
1832f2d8 | 291 | .compat_ioctl = compat_ptr_ioctl, |
c0cdc19f BA |
292 | }; |
293 | ||
294 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
295 | char *buf) | |
296 | { | |
297 | struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); | |
298 | ||
299 | return sprintf(buf, "%s\n", eptdev->chinfo.name); | |
300 | } | |
301 | static DEVICE_ATTR_RO(name); | |
302 | ||
303 | static ssize_t src_show(struct device *dev, struct device_attribute *attr, | |
304 | char *buf) | |
305 | { | |
306 | struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); | |
307 | ||
308 | return sprintf(buf, "%d\n", eptdev->chinfo.src); | |
309 | } | |
310 | static DEVICE_ATTR_RO(src); | |
311 | ||
312 | static ssize_t dst_show(struct device *dev, struct device_attribute *attr, | |
313 | char *buf) | |
314 | { | |
315 | struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); | |
316 | ||
317 | return sprintf(buf, "%d\n", eptdev->chinfo.dst); | |
318 | } | |
319 | static DEVICE_ATTR_RO(dst); | |
320 | ||
321 | static struct attribute *rpmsg_eptdev_attrs[] = { | |
322 | &dev_attr_name.attr, | |
323 | &dev_attr_src.attr, | |
324 | &dev_attr_dst.attr, | |
325 | NULL | |
326 | }; | |
327 | ATTRIBUTE_GROUPS(rpmsg_eptdev); | |
328 | ||
329 | static void rpmsg_eptdev_release_device(struct device *dev) | |
330 | { | |
331 | struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev); | |
332 | ||
333 | ida_simple_remove(&rpmsg_ept_ida, dev->id); | |
334 | ida_simple_remove(&rpmsg_minor_ida, MINOR(eptdev->dev.devt)); | |
335 | cdev_del(&eptdev->cdev); | |
336 | kfree(eptdev); | |
337 | } | |
338 | ||
339 | static int rpmsg_eptdev_create(struct rpmsg_ctrldev *ctrldev, | |
340 | struct rpmsg_channel_info chinfo) | |
341 | { | |
342 | struct rpmsg_device *rpdev = ctrldev->rpdev; | |
343 | struct rpmsg_eptdev *eptdev; | |
344 | struct device *dev; | |
345 | int ret; | |
346 | ||
347 | eptdev = kzalloc(sizeof(*eptdev), GFP_KERNEL); | |
348 | if (!eptdev) | |
349 | return -ENOMEM; | |
350 | ||
351 | dev = &eptdev->dev; | |
352 | eptdev->rpdev = rpdev; | |
353 | eptdev->chinfo = chinfo; | |
354 | ||
355 | mutex_init(&eptdev->ept_lock); | |
356 | spin_lock_init(&eptdev->queue_lock); | |
357 | skb_queue_head_init(&eptdev->queue); | |
358 | init_waitqueue_head(&eptdev->readq); | |
359 | ||
360 | device_initialize(dev); | |
361 | dev->class = rpmsg_class; | |
362 | dev->parent = &ctrldev->dev; | |
363 | dev->groups = rpmsg_eptdev_groups; | |
364 | dev_set_drvdata(dev, eptdev); | |
365 | ||
366 | cdev_init(&eptdev->cdev, &rpmsg_eptdev_fops); | |
367 | eptdev->cdev.owner = THIS_MODULE; | |
368 | ||
369 | ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); | |
370 | if (ret < 0) | |
371 | goto free_eptdev; | |
372 | dev->devt = MKDEV(MAJOR(rpmsg_major), ret); | |
373 | ||
374 | ret = ida_simple_get(&rpmsg_ept_ida, 0, 0, GFP_KERNEL); | |
375 | if (ret < 0) | |
376 | goto free_minor_ida; | |
377 | dev->id = ret; | |
378 | dev_set_name(dev, "rpmsg%d", ret); | |
379 | ||
380 | ret = cdev_add(&eptdev->cdev, dev->devt, 1); | |
381 | if (ret) | |
382 | goto free_ept_ida; | |
383 | ||
384 | /* We can now rely on the release function for cleanup */ | |
385 | dev->release = rpmsg_eptdev_release_device; | |
386 | ||
387 | ret = device_add(dev); | |
388 | if (ret) { | |
f6175294 | 389 | dev_err(dev, "device_add failed: %d\n", ret); |
c0cdc19f BA |
390 | put_device(dev); |
391 | } | |
392 | ||
393 | return ret; | |
394 | ||
395 | free_ept_ida: | |
396 | ida_simple_remove(&rpmsg_ept_ida, dev->id); | |
397 | free_minor_ida: | |
398 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
399 | free_eptdev: | |
400 | put_device(dev); | |
401 | kfree(eptdev); | |
402 | ||
403 | return ret; | |
404 | } | |
405 | ||
406 | static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp) | |
407 | { | |
408 | struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); | |
409 | ||
410 | get_device(&ctrldev->dev); | |
411 | filp->private_data = ctrldev; | |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
416 | static int rpmsg_ctrldev_release(struct inode *inode, struct file *filp) | |
417 | { | |
418 | struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); | |
419 | ||
420 | put_device(&ctrldev->dev); | |
421 | ||
422 | return 0; | |
423 | } | |
424 | ||
425 | static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd, | |
426 | unsigned long arg) | |
427 | { | |
428 | struct rpmsg_ctrldev *ctrldev = fp->private_data; | |
429 | void __user *argp = (void __user *)arg; | |
430 | struct rpmsg_endpoint_info eptinfo; | |
431 | struct rpmsg_channel_info chinfo; | |
432 | ||
433 | if (cmd != RPMSG_CREATE_EPT_IOCTL) | |
434 | return -EINVAL; | |
435 | ||
436 | if (copy_from_user(&eptinfo, argp, sizeof(eptinfo))) | |
437 | return -EFAULT; | |
438 | ||
439 | memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE); | |
440 | chinfo.name[RPMSG_NAME_SIZE-1] = '\0'; | |
441 | chinfo.src = eptinfo.src; | |
442 | chinfo.dst = eptinfo.dst; | |
443 | ||
444 | return rpmsg_eptdev_create(ctrldev, chinfo); | |
445 | }; | |
446 | ||
447 | static const struct file_operations rpmsg_ctrldev_fops = { | |
448 | .owner = THIS_MODULE, | |
449 | .open = rpmsg_ctrldev_open, | |
450 | .release = rpmsg_ctrldev_release, | |
451 | .unlocked_ioctl = rpmsg_ctrldev_ioctl, | |
1832f2d8 | 452 | .compat_ioctl = compat_ptr_ioctl, |
c0cdc19f BA |
453 | }; |
454 | ||
455 | static void rpmsg_ctrldev_release_device(struct device *dev) | |
456 | { | |
457 | struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev); | |
458 | ||
459 | ida_simple_remove(&rpmsg_ctrl_ida, dev->id); | |
460 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
461 | cdev_del(&ctrldev->cdev); | |
462 | kfree(ctrldev); | |
463 | } | |
464 | ||
465 | static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev) | |
466 | { | |
467 | struct rpmsg_ctrldev *ctrldev; | |
468 | struct device *dev; | |
469 | int ret; | |
470 | ||
471 | ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL); | |
472 | if (!ctrldev) | |
473 | return -ENOMEM; | |
474 | ||
475 | ctrldev->rpdev = rpdev; | |
476 | ||
477 | dev = &ctrldev->dev; | |
478 | device_initialize(dev); | |
479 | dev->parent = &rpdev->dev; | |
480 | dev->class = rpmsg_class; | |
481 | ||
482 | cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops); | |
483 | ctrldev->cdev.owner = THIS_MODULE; | |
484 | ||
485 | ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); | |
486 | if (ret < 0) | |
487 | goto free_ctrldev; | |
488 | dev->devt = MKDEV(MAJOR(rpmsg_major), ret); | |
489 | ||
490 | ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL); | |
491 | if (ret < 0) | |
492 | goto free_minor_ida; | |
493 | dev->id = ret; | |
494 | dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret); | |
495 | ||
496 | ret = cdev_add(&ctrldev->cdev, dev->devt, 1); | |
497 | if (ret) | |
498 | goto free_ctrl_ida; | |
499 | ||
500 | /* We can now rely on the release function for cleanup */ | |
501 | dev->release = rpmsg_ctrldev_release_device; | |
502 | ||
503 | ret = device_add(dev); | |
504 | if (ret) { | |
f6175294 | 505 | dev_err(&rpdev->dev, "device_add failed: %d\n", ret); |
c0cdc19f BA |
506 | put_device(dev); |
507 | } | |
508 | ||
509 | dev_set_drvdata(&rpdev->dev, ctrldev); | |
510 | ||
511 | return ret; | |
512 | ||
513 | free_ctrl_ida: | |
514 | ida_simple_remove(&rpmsg_ctrl_ida, dev->id); | |
515 | free_minor_ida: | |
516 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
517 | free_ctrldev: | |
518 | put_device(dev); | |
519 | kfree(ctrldev); | |
520 | ||
521 | return ret; | |
522 | } | |
523 | ||
524 | static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev) | |
525 | { | |
526 | struct rpmsg_ctrldev *ctrldev = dev_get_drvdata(&rpdev->dev); | |
527 | int ret; | |
528 | ||
529 | /* Destroy all endpoints */ | |
530 | ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_eptdev_destroy); | |
531 | if (ret) | |
532 | dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret); | |
533 | ||
534 | device_del(&ctrldev->dev); | |
535 | put_device(&ctrldev->dev); | |
536 | } | |
537 | ||
538 | static struct rpmsg_driver rpmsg_chrdev_driver = { | |
539 | .probe = rpmsg_chrdev_probe, | |
540 | .remove = rpmsg_chrdev_remove, | |
541 | .drv = { | |
542 | .name = "rpmsg_chrdev", | |
543 | }, | |
544 | }; | |
545 | ||
546 | static int rpmsg_char_init(void) | |
547 | { | |
548 | int ret; | |
549 | ||
550 | ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg"); | |
551 | if (ret < 0) { | |
552 | pr_err("rpmsg: failed to allocate char dev region\n"); | |
553 | return ret; | |
554 | } | |
555 | ||
556 | rpmsg_class = class_create(THIS_MODULE, "rpmsg"); | |
557 | if (IS_ERR(rpmsg_class)) { | |
558 | pr_err("failed to create rpmsg class\n"); | |
559 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
560 | return PTR_ERR(rpmsg_class); | |
561 | } | |
562 | ||
563 | ret = register_rpmsg_driver(&rpmsg_chrdev_driver); | |
564 | if (ret < 0) { | |
565 | pr_err("rpmsgchr: failed to register rpmsg driver\n"); | |
566 | class_destroy(rpmsg_class); | |
567 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
568 | } | |
569 | ||
570 | return ret; | |
571 | } | |
572 | postcore_initcall(rpmsg_char_init); | |
573 | ||
574 | static void rpmsg_chrdev_exit(void) | |
575 | { | |
576 | unregister_rpmsg_driver(&rpmsg_chrdev_driver); | |
577 | class_destroy(rpmsg_class); | |
578 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
579 | } | |
580 | module_exit(rpmsg_chrdev_exit); | |
93dd4e73 RF |
581 | |
582 | MODULE_ALIAS("rpmsg:rpmsg_chrdev"); | |
c0cdc19f | 583 | MODULE_LICENSE("GPL v2"); |