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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 | ||
f7d44503 | 95 | cdev_device_del(&eptdev->cdev, &eptdev->dev); |
c0cdc19f BA |
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 | ||
964e8bed AP |
130 | if (eptdev->ept) |
131 | return -EBUSY; | |
132 | ||
c0cdc19f BA |
133 | get_device(dev); |
134 | ||
135 | ept = rpmsg_create_ept(rpdev, rpmsg_ept_cb, eptdev, eptdev->chinfo); | |
136 | if (!ept) { | |
137 | dev_err(dev, "failed to open %s\n", eptdev->chinfo.name); | |
138 | put_device(dev); | |
139 | return -EINVAL; | |
140 | } | |
141 | ||
142 | eptdev->ept = ept; | |
143 | filp->private_data = eptdev; | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | static int rpmsg_eptdev_release(struct inode *inode, struct file *filp) | |
149 | { | |
150 | struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev); | |
151 | struct device *dev = &eptdev->dev; | |
c0cdc19f BA |
152 | |
153 | /* Close the endpoint, if it's not already destroyed by the parent */ | |
154 | mutex_lock(&eptdev->ept_lock); | |
155 | if (eptdev->ept) { | |
156 | rpmsg_destroy_ept(eptdev->ept); | |
157 | eptdev->ept = NULL; | |
158 | } | |
159 | mutex_unlock(&eptdev->ept_lock); | |
160 | ||
161 | /* Discard all SKBs */ | |
bb06a5ce | 162 | skb_queue_purge(&eptdev->queue); |
c0cdc19f BA |
163 | |
164 | put_device(dev); | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
ccf45b18 | 169 | static ssize_t rpmsg_eptdev_read_iter(struct kiocb *iocb, struct iov_iter *to) |
c0cdc19f | 170 | { |
ccf45b18 | 171 | struct file *filp = iocb->ki_filp; |
c0cdc19f BA |
172 | struct rpmsg_eptdev *eptdev = filp->private_data; |
173 | unsigned long flags; | |
174 | struct sk_buff *skb; | |
175 | int use; | |
176 | ||
177 | if (!eptdev->ept) | |
178 | return -EPIPE; | |
179 | ||
180 | spin_lock_irqsave(&eptdev->queue_lock, flags); | |
181 | ||
182 | /* Wait for data in the queue */ | |
183 | if (skb_queue_empty(&eptdev->queue)) { | |
184 | spin_unlock_irqrestore(&eptdev->queue_lock, flags); | |
185 | ||
186 | if (filp->f_flags & O_NONBLOCK) | |
187 | return -EAGAIN; | |
188 | ||
189 | /* Wait until we get data or the endpoint goes away */ | |
190 | if (wait_event_interruptible(eptdev->readq, | |
191 | !skb_queue_empty(&eptdev->queue) || | |
192 | !eptdev->ept)) | |
193 | return -ERESTARTSYS; | |
194 | ||
195 | /* We lost the endpoint while waiting */ | |
196 | if (!eptdev->ept) | |
197 | return -EPIPE; | |
198 | ||
199 | spin_lock_irqsave(&eptdev->queue_lock, flags); | |
200 | } | |
201 | ||
202 | skb = skb_dequeue(&eptdev->queue); | |
0abd6bdd | 203 | spin_unlock_irqrestore(&eptdev->queue_lock, flags); |
c0cdc19f BA |
204 | if (!skb) |
205 | return -EFAULT; | |
206 | ||
ccf45b18 BA |
207 | use = min_t(size_t, iov_iter_count(to), skb->len); |
208 | if (copy_to_iter(skb->data, use, to) != use) | |
c0cdc19f BA |
209 | use = -EFAULT; |
210 | ||
211 | kfree_skb(skb); | |
212 | ||
213 | return use; | |
214 | } | |
215 | ||
ccf45b18 BA |
216 | static ssize_t rpmsg_eptdev_write_iter(struct kiocb *iocb, |
217 | struct iov_iter *from) | |
c0cdc19f | 218 | { |
ccf45b18 | 219 | struct file *filp = iocb->ki_filp; |
c0cdc19f | 220 | struct rpmsg_eptdev *eptdev = filp->private_data; |
ccf45b18 | 221 | size_t len = iov_iter_count(from); |
c0cdc19f BA |
222 | void *kbuf; |
223 | int ret; | |
224 | ||
ccf45b18 BA |
225 | kbuf = kzalloc(len, GFP_KERNEL); |
226 | if (!kbuf) | |
227 | return -ENOMEM; | |
228 | ||
bbe692e3 NE |
229 | if (!copy_from_iter_full(kbuf, len, from)) { |
230 | ret = -EFAULT; | |
231 | goto free_kbuf; | |
232 | } | |
c0cdc19f BA |
233 | |
234 | if (mutex_lock_interruptible(&eptdev->ept_lock)) { | |
235 | ret = -ERESTARTSYS; | |
236 | goto free_kbuf; | |
237 | } | |
238 | ||
239 | if (!eptdev->ept) { | |
240 | ret = -EPIPE; | |
241 | goto unlock_eptdev; | |
242 | } | |
243 | ||
244 | if (filp->f_flags & O_NONBLOCK) | |
b4ce7e2e | 245 | ret = rpmsg_trysendto(eptdev->ept, kbuf, len, eptdev->chinfo.dst); |
c0cdc19f | 246 | else |
b4ce7e2e | 247 | ret = rpmsg_sendto(eptdev->ept, kbuf, len, eptdev->chinfo.dst); |
c0cdc19f BA |
248 | |
249 | unlock_eptdev: | |
250 | mutex_unlock(&eptdev->ept_lock); | |
251 | ||
252 | free_kbuf: | |
253 | kfree(kbuf); | |
254 | return ret < 0 ? ret : len; | |
255 | } | |
256 | ||
afc9a42b | 257 | static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait) |
c0cdc19f BA |
258 | { |
259 | struct rpmsg_eptdev *eptdev = filp->private_data; | |
afc9a42b | 260 | __poll_t mask = 0; |
c0cdc19f BA |
261 | |
262 | if (!eptdev->ept) | |
a9a08845 | 263 | return EPOLLERR; |
c0cdc19f BA |
264 | |
265 | poll_wait(filp, &eptdev->readq, wait); | |
266 | ||
267 | if (!skb_queue_empty(&eptdev->queue)) | |
a9a08845 | 268 | mask |= EPOLLIN | EPOLLRDNORM; |
c0cdc19f BA |
269 | |
270 | mask |= rpmsg_poll(eptdev->ept, filp, wait); | |
271 | ||
272 | return mask; | |
273 | } | |
274 | ||
275 | static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd, | |
276 | unsigned long arg) | |
277 | { | |
278 | struct rpmsg_eptdev *eptdev = fp->private_data; | |
279 | ||
280 | if (cmd != RPMSG_DESTROY_EPT_IOCTL) | |
281 | return -EINVAL; | |
282 | ||
283 | return rpmsg_eptdev_destroy(&eptdev->dev, NULL); | |
284 | } | |
285 | ||
286 | static const struct file_operations rpmsg_eptdev_fops = { | |
287 | .owner = THIS_MODULE, | |
288 | .open = rpmsg_eptdev_open, | |
289 | .release = rpmsg_eptdev_release, | |
ccf45b18 BA |
290 | .read_iter = rpmsg_eptdev_read_iter, |
291 | .write_iter = rpmsg_eptdev_write_iter, | |
c0cdc19f BA |
292 | .poll = rpmsg_eptdev_poll, |
293 | .unlocked_ioctl = rpmsg_eptdev_ioctl, | |
1832f2d8 | 294 | .compat_ioctl = compat_ptr_ioctl, |
c0cdc19f BA |
295 | }; |
296 | ||
297 | static ssize_t name_show(struct device *dev, struct device_attribute *attr, | |
298 | char *buf) | |
299 | { | |
300 | struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); | |
301 | ||
302 | return sprintf(buf, "%s\n", eptdev->chinfo.name); | |
303 | } | |
304 | static DEVICE_ATTR_RO(name); | |
305 | ||
306 | static ssize_t src_show(struct device *dev, struct device_attribute *attr, | |
307 | char *buf) | |
308 | { | |
309 | struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); | |
310 | ||
311 | return sprintf(buf, "%d\n", eptdev->chinfo.src); | |
312 | } | |
313 | static DEVICE_ATTR_RO(src); | |
314 | ||
315 | static ssize_t dst_show(struct device *dev, struct device_attribute *attr, | |
316 | char *buf) | |
317 | { | |
318 | struct rpmsg_eptdev *eptdev = dev_get_drvdata(dev); | |
319 | ||
320 | return sprintf(buf, "%d\n", eptdev->chinfo.dst); | |
321 | } | |
322 | static DEVICE_ATTR_RO(dst); | |
323 | ||
324 | static struct attribute *rpmsg_eptdev_attrs[] = { | |
325 | &dev_attr_name.attr, | |
326 | &dev_attr_src.attr, | |
327 | &dev_attr_dst.attr, | |
328 | NULL | |
329 | }; | |
330 | ATTRIBUTE_GROUPS(rpmsg_eptdev); | |
331 | ||
332 | static void rpmsg_eptdev_release_device(struct device *dev) | |
333 | { | |
334 | struct rpmsg_eptdev *eptdev = dev_to_eptdev(dev); | |
335 | ||
336 | ida_simple_remove(&rpmsg_ept_ida, dev->id); | |
337 | ida_simple_remove(&rpmsg_minor_ida, MINOR(eptdev->dev.devt)); | |
c0cdc19f BA |
338 | kfree(eptdev); |
339 | } | |
340 | ||
341 | static int rpmsg_eptdev_create(struct rpmsg_ctrldev *ctrldev, | |
342 | struct rpmsg_channel_info chinfo) | |
343 | { | |
344 | struct rpmsg_device *rpdev = ctrldev->rpdev; | |
345 | struct rpmsg_eptdev *eptdev; | |
346 | struct device *dev; | |
347 | int ret; | |
348 | ||
349 | eptdev = kzalloc(sizeof(*eptdev), GFP_KERNEL); | |
350 | if (!eptdev) | |
351 | return -ENOMEM; | |
352 | ||
353 | dev = &eptdev->dev; | |
354 | eptdev->rpdev = rpdev; | |
355 | eptdev->chinfo = chinfo; | |
356 | ||
357 | mutex_init(&eptdev->ept_lock); | |
358 | spin_lock_init(&eptdev->queue_lock); | |
359 | skb_queue_head_init(&eptdev->queue); | |
360 | init_waitqueue_head(&eptdev->readq); | |
361 | ||
362 | device_initialize(dev); | |
363 | dev->class = rpmsg_class; | |
364 | dev->parent = &ctrldev->dev; | |
365 | dev->groups = rpmsg_eptdev_groups; | |
366 | dev_set_drvdata(dev, eptdev); | |
367 | ||
368 | cdev_init(&eptdev->cdev, &rpmsg_eptdev_fops); | |
369 | eptdev->cdev.owner = THIS_MODULE; | |
370 | ||
371 | ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); | |
372 | if (ret < 0) | |
373 | goto free_eptdev; | |
374 | dev->devt = MKDEV(MAJOR(rpmsg_major), ret); | |
375 | ||
376 | ret = ida_simple_get(&rpmsg_ept_ida, 0, 0, GFP_KERNEL); | |
377 | if (ret < 0) | |
378 | goto free_minor_ida; | |
379 | dev->id = ret; | |
380 | dev_set_name(dev, "rpmsg%d", ret); | |
381 | ||
f7d44503 | 382 | ret = cdev_device_add(&eptdev->cdev, &eptdev->dev); |
c0cdc19f BA |
383 | if (ret) |
384 | goto free_ept_ida; | |
385 | ||
386 | /* We can now rely on the release function for cleanup */ | |
387 | dev->release = rpmsg_eptdev_release_device; | |
388 | ||
c0cdc19f BA |
389 | return ret; |
390 | ||
391 | free_ept_ida: | |
392 | ida_simple_remove(&rpmsg_ept_ida, dev->id); | |
393 | free_minor_ida: | |
394 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
395 | free_eptdev: | |
396 | put_device(dev); | |
397 | kfree(eptdev); | |
398 | ||
399 | return ret; | |
400 | } | |
401 | ||
402 | static int rpmsg_ctrldev_open(struct inode *inode, struct file *filp) | |
403 | { | |
404 | struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); | |
405 | ||
406 | get_device(&ctrldev->dev); | |
407 | filp->private_data = ctrldev; | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static int rpmsg_ctrldev_release(struct inode *inode, struct file *filp) | |
413 | { | |
414 | struct rpmsg_ctrldev *ctrldev = cdev_to_ctrldev(inode->i_cdev); | |
415 | ||
416 | put_device(&ctrldev->dev); | |
417 | ||
418 | return 0; | |
419 | } | |
420 | ||
421 | static long rpmsg_ctrldev_ioctl(struct file *fp, unsigned int cmd, | |
422 | unsigned long arg) | |
423 | { | |
424 | struct rpmsg_ctrldev *ctrldev = fp->private_data; | |
425 | void __user *argp = (void __user *)arg; | |
426 | struct rpmsg_endpoint_info eptinfo; | |
427 | struct rpmsg_channel_info chinfo; | |
428 | ||
429 | if (cmd != RPMSG_CREATE_EPT_IOCTL) | |
430 | return -EINVAL; | |
431 | ||
432 | if (copy_from_user(&eptinfo, argp, sizeof(eptinfo))) | |
433 | return -EFAULT; | |
434 | ||
435 | memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE); | |
436 | chinfo.name[RPMSG_NAME_SIZE-1] = '\0'; | |
437 | chinfo.src = eptinfo.src; | |
438 | chinfo.dst = eptinfo.dst; | |
439 | ||
440 | return rpmsg_eptdev_create(ctrldev, chinfo); | |
441 | }; | |
442 | ||
443 | static const struct file_operations rpmsg_ctrldev_fops = { | |
444 | .owner = THIS_MODULE, | |
445 | .open = rpmsg_ctrldev_open, | |
446 | .release = rpmsg_ctrldev_release, | |
447 | .unlocked_ioctl = rpmsg_ctrldev_ioctl, | |
1832f2d8 | 448 | .compat_ioctl = compat_ptr_ioctl, |
c0cdc19f BA |
449 | }; |
450 | ||
451 | static void rpmsg_ctrldev_release_device(struct device *dev) | |
452 | { | |
453 | struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev); | |
454 | ||
455 | ida_simple_remove(&rpmsg_ctrl_ida, dev->id); | |
456 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
c0cdc19f BA |
457 | kfree(ctrldev); |
458 | } | |
459 | ||
460 | static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev) | |
461 | { | |
462 | struct rpmsg_ctrldev *ctrldev; | |
463 | struct device *dev; | |
464 | int ret; | |
465 | ||
466 | ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL); | |
467 | if (!ctrldev) | |
468 | return -ENOMEM; | |
469 | ||
470 | ctrldev->rpdev = rpdev; | |
471 | ||
472 | dev = &ctrldev->dev; | |
473 | device_initialize(dev); | |
474 | dev->parent = &rpdev->dev; | |
475 | dev->class = rpmsg_class; | |
476 | ||
477 | cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops); | |
478 | ctrldev->cdev.owner = THIS_MODULE; | |
479 | ||
480 | ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL); | |
481 | if (ret < 0) | |
482 | goto free_ctrldev; | |
483 | dev->devt = MKDEV(MAJOR(rpmsg_major), ret); | |
484 | ||
485 | ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL); | |
486 | if (ret < 0) | |
487 | goto free_minor_ida; | |
488 | dev->id = ret; | |
489 | dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret); | |
490 | ||
00ba7f65 | 491 | ret = cdev_device_add(&ctrldev->cdev, &ctrldev->dev); |
c0cdc19f BA |
492 | if (ret) |
493 | goto free_ctrl_ida; | |
494 | ||
495 | /* We can now rely on the release function for cleanup */ | |
496 | dev->release = rpmsg_ctrldev_release_device; | |
497 | ||
c0cdc19f BA |
498 | dev_set_drvdata(&rpdev->dev, ctrldev); |
499 | ||
500 | return ret; | |
501 | ||
502 | free_ctrl_ida: | |
503 | ida_simple_remove(&rpmsg_ctrl_ida, dev->id); | |
504 | free_minor_ida: | |
505 | ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt)); | |
506 | free_ctrldev: | |
507 | put_device(dev); | |
508 | kfree(ctrldev); | |
509 | ||
510 | return ret; | |
511 | } | |
512 | ||
513 | static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev) | |
514 | { | |
515 | struct rpmsg_ctrldev *ctrldev = dev_get_drvdata(&rpdev->dev); | |
516 | int ret; | |
517 | ||
518 | /* Destroy all endpoints */ | |
519 | ret = device_for_each_child(&ctrldev->dev, NULL, rpmsg_eptdev_destroy); | |
520 | if (ret) | |
521 | dev_warn(&rpdev->dev, "failed to nuke endpoints: %d\n", ret); | |
522 | ||
00ba7f65 | 523 | cdev_device_del(&ctrldev->cdev, &ctrldev->dev); |
c0cdc19f BA |
524 | put_device(&ctrldev->dev); |
525 | } | |
526 | ||
527 | static struct rpmsg_driver rpmsg_chrdev_driver = { | |
528 | .probe = rpmsg_chrdev_probe, | |
529 | .remove = rpmsg_chrdev_remove, | |
530 | .drv = { | |
531 | .name = "rpmsg_chrdev", | |
532 | }, | |
533 | }; | |
534 | ||
60d7b22d | 535 | static int rpmsg_chrdev_init(void) |
c0cdc19f BA |
536 | { |
537 | int ret; | |
538 | ||
539 | ret = alloc_chrdev_region(&rpmsg_major, 0, RPMSG_DEV_MAX, "rpmsg"); | |
540 | if (ret < 0) { | |
541 | pr_err("rpmsg: failed to allocate char dev region\n"); | |
542 | return ret; | |
543 | } | |
544 | ||
545 | rpmsg_class = class_create(THIS_MODULE, "rpmsg"); | |
546 | if (IS_ERR(rpmsg_class)) { | |
547 | pr_err("failed to create rpmsg class\n"); | |
548 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
549 | return PTR_ERR(rpmsg_class); | |
550 | } | |
551 | ||
552 | ret = register_rpmsg_driver(&rpmsg_chrdev_driver); | |
553 | if (ret < 0) { | |
554 | pr_err("rpmsgchr: failed to register rpmsg driver\n"); | |
555 | class_destroy(rpmsg_class); | |
556 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
557 | } | |
558 | ||
559 | return ret; | |
560 | } | |
60d7b22d | 561 | postcore_initcall(rpmsg_chrdev_init); |
c0cdc19f BA |
562 | |
563 | static void rpmsg_chrdev_exit(void) | |
564 | { | |
565 | unregister_rpmsg_driver(&rpmsg_chrdev_driver); | |
566 | class_destroy(rpmsg_class); | |
567 | unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX); | |
568 | } | |
569 | module_exit(rpmsg_chrdev_exit); | |
93dd4e73 RF |
570 | |
571 | MODULE_ALIAS("rpmsg:rpmsg_chrdev"); | |
c0cdc19f | 572 | MODULE_LICENSE("GPL v2"); |