Commit | Line | Data |
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3e79bfd6 | 1 | // SPDX-License-Identifier: GPL-2.0 |
026dad47 BA |
2 | /* |
3 | * remote processor messaging bus | |
4 | * | |
5 | * Copyright (C) 2011 Texas Instruments, Inc. | |
6 | * Copyright (C) 2011 Google, Inc. | |
7 | * | |
8 | * Ohad Ben-Cohen <ohad@wizery.com> | |
9 | * Brian Swetland <swetland@google.com> | |
026dad47 BA |
10 | */ |
11 | ||
12 | #define pr_fmt(fmt) "%s: " fmt, __func__ | |
13 | ||
14 | #include <linux/kernel.h> | |
fade037e | 15 | #include <linux/module.h> |
026dad47 | 16 | #include <linux/rpmsg.h> |
fade037e | 17 | #include <linux/of_device.h> |
fe782aff | 18 | #include <linux/pm_domain.h> |
fade037e | 19 | #include <linux/slab.h> |
026dad47 | 20 | |
8b881c07 BA |
21 | #include "rpmsg_internal.h" |
22 | ||
026dad47 BA |
23 | /** |
24 | * rpmsg_create_ept() - create a new rpmsg_endpoint | |
25 | * @rpdev: rpmsg channel device | |
26 | * @cb: rx callback handler | |
27 | * @priv: private data for the driver's use | |
28 | * @chinfo: channel_info with the local rpmsg address to bind with @cb | |
29 | * | |
30 | * Every rpmsg address in the system is bound to an rx callback (so when | |
31 | * inbound messages arrive, they are dispatched by the rpmsg bus using the | |
32 | * appropriate callback handler) by means of an rpmsg_endpoint struct. | |
33 | * | |
34 | * This function allows drivers to create such an endpoint, and by that, | |
35 | * bind a callback, and possibly some private data too, to an rpmsg address | |
36 | * (either one that is known in advance, or one that will be dynamically | |
37 | * assigned for them). | |
38 | * | |
39 | * Simple rpmsg drivers need not call rpmsg_create_ept, because an endpoint | |
40 | * is already created for them when they are probed by the rpmsg bus | |
41 | * (using the rx callback provided when they registered to the rpmsg bus). | |
42 | * | |
43 | * So things should just work for simple drivers: they already have an | |
44 | * endpoint, their rx callback is bound to their rpmsg address, and when | |
45 | * relevant inbound messages arrive (i.e. messages which their dst address | |
46 | * equals to the src address of their rpmsg channel), the driver's handler | |
47 | * is invoked to process it. | |
48 | * | |
49 | * That said, more complicated drivers might do need to allocate | |
50 | * additional rpmsg addresses, and bind them to different rx callbacks. | |
51 | * To accomplish that, those drivers need to call this function. | |
52 | * | |
53 | * Drivers should provide their @rpdev channel (so the new endpoint would belong | |
54 | * to the same remote processor their channel belongs to), an rx callback | |
55 | * function, an optional private data (which is provided back when the | |
56 | * rx callback is invoked), and an address they want to bind with the | |
57 | * callback. If @addr is RPMSG_ADDR_ANY, then rpmsg_create_ept will | |
58 | * dynamically assign them an available rpmsg address (drivers should have | |
59 | * a very good reason why not to always use RPMSG_ADDR_ANY here). | |
60 | * | |
61 | * Returns a pointer to the endpoint on success, or NULL on error. | |
62 | */ | |
63 | struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev, | |
64 | rpmsg_rx_cb_t cb, void *priv, | |
65 | struct rpmsg_channel_info chinfo) | |
66 | { | |
93e93244 | 67 | if (WARN_ON(!rpdev)) |
fa04b769 | 68 | return NULL; |
93e93244 | 69 | |
026dad47 BA |
70 | return rpdev->ops->create_ept(rpdev, cb, priv, chinfo); |
71 | } | |
72 | EXPORT_SYMBOL(rpmsg_create_ept); | |
c9bd6f42 BA |
73 | |
74 | /** | |
75 | * rpmsg_destroy_ept() - destroy an existing rpmsg endpoint | |
76 | * @ept: endpoing to destroy | |
77 | * | |
78 | * Should be used by drivers to destroy an rpmsg endpoint previously | |
93e93244 BA |
79 | * created with rpmsg_create_ept(). As with other types of "free" NULL |
80 | * is a valid parameter. | |
c9bd6f42 BA |
81 | */ |
82 | void rpmsg_destroy_ept(struct rpmsg_endpoint *ept) | |
83 | { | |
93e93244 BA |
84 | if (ept) |
85 | ept->ops->destroy_ept(ept); | |
c9bd6f42 BA |
86 | } |
87 | EXPORT_SYMBOL(rpmsg_destroy_ept); | |
88 | ||
89 | /** | |
90 | * rpmsg_send() - send a message across to the remote processor | |
91 | * @ept: the rpmsg endpoint | |
92 | * @data: payload of message | |
93 | * @len: length of payload | |
94 | * | |
95 | * This function sends @data of length @len on the @ept endpoint. | |
96 | * The message will be sent to the remote processor which the @ept | |
97 | * endpoint belongs to, using @ept's address and its associated rpmsg | |
98 | * device destination addresses. | |
99 | * In case there are no TX buffers available, the function will block until | |
100 | * one becomes available, or a timeout of 15 seconds elapses. When the latter | |
101 | * happens, -ERESTARTSYS is returned. | |
102 | * | |
103 | * Can only be called from process context (for now). | |
104 | * | |
105 | * Returns 0 on success and an appropriate error value on failure. | |
106 | */ | |
107 | int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len) | |
108 | { | |
93e93244 BA |
109 | if (WARN_ON(!ept)) |
110 | return -EINVAL; | |
111 | if (!ept->ops->send) | |
112 | return -ENXIO; | |
113 | ||
c9bd6f42 BA |
114 | return ept->ops->send(ept, data, len); |
115 | } | |
116 | EXPORT_SYMBOL(rpmsg_send); | |
117 | ||
118 | /** | |
119 | * rpmsg_sendto() - send a message across to the remote processor, specify dst | |
120 | * @ept: the rpmsg endpoint | |
121 | * @data: payload of message | |
122 | * @len: length of payload | |
123 | * @dst: destination address | |
124 | * | |
125 | * This function sends @data of length @len to the remote @dst address. | |
126 | * The message will be sent to the remote processor which the @ept | |
127 | * endpoint belongs to, using @ept's address as source. | |
128 | * In case there are no TX buffers available, the function will block until | |
129 | * one becomes available, or a timeout of 15 seconds elapses. When the latter | |
130 | * happens, -ERESTARTSYS is returned. | |
131 | * | |
132 | * Can only be called from process context (for now). | |
133 | * | |
134 | * Returns 0 on success and an appropriate error value on failure. | |
135 | */ | |
136 | int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) | |
137 | { | |
93e93244 BA |
138 | if (WARN_ON(!ept)) |
139 | return -EINVAL; | |
140 | if (!ept->ops->sendto) | |
141 | return -ENXIO; | |
142 | ||
c9bd6f42 BA |
143 | return ept->ops->sendto(ept, data, len, dst); |
144 | } | |
145 | EXPORT_SYMBOL(rpmsg_sendto); | |
146 | ||
147 | /** | |
148 | * rpmsg_send_offchannel() - send a message using explicit src/dst addresses | |
149 | * @ept: the rpmsg endpoint | |
150 | * @src: source address | |
151 | * @dst: destination address | |
152 | * @data: payload of message | |
153 | * @len: length of payload | |
154 | * | |
155 | * This function sends @data of length @len to the remote @dst address, | |
156 | * and uses @src as the source address. | |
157 | * The message will be sent to the remote processor which the @ept | |
158 | * endpoint belongs to. | |
159 | * In case there are no TX buffers available, the function will block until | |
160 | * one becomes available, or a timeout of 15 seconds elapses. When the latter | |
161 | * happens, -ERESTARTSYS is returned. | |
162 | * | |
163 | * Can only be called from process context (for now). | |
164 | * | |
165 | * Returns 0 on success and an appropriate error value on failure. | |
166 | */ | |
167 | int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, | |
168 | void *data, int len) | |
169 | { | |
93e93244 BA |
170 | if (WARN_ON(!ept)) |
171 | return -EINVAL; | |
172 | if (!ept->ops->send_offchannel) | |
173 | return -ENXIO; | |
174 | ||
c9bd6f42 BA |
175 | return ept->ops->send_offchannel(ept, src, dst, data, len); |
176 | } | |
177 | EXPORT_SYMBOL(rpmsg_send_offchannel); | |
178 | ||
179 | /** | |
180 | * rpmsg_send() - send a message across to the remote processor | |
181 | * @ept: the rpmsg endpoint | |
182 | * @data: payload of message | |
183 | * @len: length of payload | |
184 | * | |
185 | * This function sends @data of length @len on the @ept endpoint. | |
186 | * The message will be sent to the remote processor which the @ept | |
187 | * endpoint belongs to, using @ept's address as source and its associated | |
188 | * rpdev's address as destination. | |
189 | * In case there are no TX buffers available, the function will immediately | |
190 | * return -ENOMEM without waiting until one becomes available. | |
191 | * | |
192 | * Can only be called from process context (for now). | |
193 | * | |
194 | * Returns 0 on success and an appropriate error value on failure. | |
195 | */ | |
196 | int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len) | |
197 | { | |
93e93244 BA |
198 | if (WARN_ON(!ept)) |
199 | return -EINVAL; | |
200 | if (!ept->ops->trysend) | |
201 | return -ENXIO; | |
202 | ||
c9bd6f42 BA |
203 | return ept->ops->trysend(ept, data, len); |
204 | } | |
205 | EXPORT_SYMBOL(rpmsg_trysend); | |
206 | ||
207 | /** | |
208 | * rpmsg_sendto() - send a message across to the remote processor, specify dst | |
209 | * @ept: the rpmsg endpoint | |
210 | * @data: payload of message | |
211 | * @len: length of payload | |
212 | * @dst: destination address | |
213 | * | |
214 | * This function sends @data of length @len to the remote @dst address. | |
215 | * The message will be sent to the remote processor which the @ept | |
216 | * endpoint belongs to, using @ept's address as source. | |
217 | * In case there are no TX buffers available, the function will immediately | |
218 | * return -ENOMEM without waiting until one becomes available. | |
219 | * | |
220 | * Can only be called from process context (for now). | |
221 | * | |
222 | * Returns 0 on success and an appropriate error value on failure. | |
223 | */ | |
224 | int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) | |
225 | { | |
93e93244 BA |
226 | if (WARN_ON(!ept)) |
227 | return -EINVAL; | |
228 | if (!ept->ops->trysendto) | |
229 | return -ENXIO; | |
230 | ||
c9bd6f42 BA |
231 | return ept->ops->trysendto(ept, data, len, dst); |
232 | } | |
233 | EXPORT_SYMBOL(rpmsg_trysendto); | |
234 | ||
84d58132 BA |
235 | /** |
236 | * rpmsg_poll() - poll the endpoint's send buffers | |
237 | * @ept: the rpmsg endpoint | |
238 | * @filp: file for poll_wait() | |
239 | * @wait: poll_table for poll_wait() | |
240 | * | |
241 | * Returns mask representing the current state of the endpoint's send buffers | |
242 | */ | |
afc9a42b | 243 | __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp, |
84d58132 BA |
244 | poll_table *wait) |
245 | { | |
246 | if (WARN_ON(!ept)) | |
247 | return 0; | |
248 | if (!ept->ops->poll) | |
249 | return 0; | |
250 | ||
251 | return ept->ops->poll(ept, filp, wait); | |
252 | } | |
253 | EXPORT_SYMBOL(rpmsg_poll); | |
254 | ||
c9bd6f42 BA |
255 | /** |
256 | * rpmsg_send_offchannel() - send a message using explicit src/dst addresses | |
257 | * @ept: the rpmsg endpoint | |
258 | * @src: source address | |
259 | * @dst: destination address | |
260 | * @data: payload of message | |
261 | * @len: length of payload | |
262 | * | |
263 | * This function sends @data of length @len to the remote @dst address, | |
264 | * and uses @src as the source address. | |
265 | * The message will be sent to the remote processor which the @ept | |
266 | * endpoint belongs to. | |
267 | * In case there are no TX buffers available, the function will immediately | |
268 | * return -ENOMEM without waiting until one becomes available. | |
269 | * | |
270 | * Can only be called from process context (for now). | |
271 | * | |
272 | * Returns 0 on success and an appropriate error value on failure. | |
273 | */ | |
274 | int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, | |
275 | void *data, int len) | |
276 | { | |
93e93244 BA |
277 | if (WARN_ON(!ept)) |
278 | return -EINVAL; | |
279 | if (!ept->ops->trysend_offchannel) | |
280 | return -ENXIO; | |
281 | ||
c9bd6f42 BA |
282 | return ept->ops->trysend_offchannel(ept, src, dst, data, len); |
283 | } | |
284 | EXPORT_SYMBOL(rpmsg_trysend_offchannel); | |
8b881c07 BA |
285 | |
286 | /* | |
287 | * match an rpmsg channel with a channel info struct. | |
288 | * this is used to make sure we're not creating rpmsg devices for channels | |
289 | * that already exist. | |
290 | */ | |
291 | static int rpmsg_device_match(struct device *dev, void *data) | |
292 | { | |
293 | struct rpmsg_channel_info *chinfo = data; | |
294 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
295 | ||
296 | if (chinfo->src != RPMSG_ADDR_ANY && chinfo->src != rpdev->src) | |
297 | return 0; | |
298 | ||
299 | if (chinfo->dst != RPMSG_ADDR_ANY && chinfo->dst != rpdev->dst) | |
300 | return 0; | |
301 | ||
302 | if (strncmp(chinfo->name, rpdev->id.name, RPMSG_NAME_SIZE)) | |
303 | return 0; | |
304 | ||
305 | /* found a match ! */ | |
306 | return 1; | |
307 | } | |
308 | ||
309 | struct device *rpmsg_find_device(struct device *parent, | |
310 | struct rpmsg_channel_info *chinfo) | |
311 | { | |
312 | return device_find_child(parent, chinfo, rpmsg_device_match); | |
313 | ||
314 | } | |
315 | EXPORT_SYMBOL(rpmsg_find_device); | |
5e619b48 BA |
316 | |
317 | /* sysfs show configuration fields */ | |
318 | #define rpmsg_show_attr(field, path, format_string) \ | |
319 | static ssize_t \ | |
320 | field##_show(struct device *dev, \ | |
321 | struct device_attribute *attr, char *buf) \ | |
322 | { \ | |
323 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ | |
324 | \ | |
325 | return sprintf(buf, format_string, rpdev->path); \ | |
39afc7af GKH |
326 | } \ |
327 | static DEVICE_ATTR_RO(field); | |
5e619b48 | 328 | |
39e47767 AP |
329 | #define rpmsg_string_attr(field, member) \ |
330 | static ssize_t \ | |
331 | field##_store(struct device *dev, struct device_attribute *attr, \ | |
332 | const char *buf, size_t sz) \ | |
333 | { \ | |
334 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ | |
335 | char *new, *old; \ | |
336 | \ | |
337 | new = kstrndup(buf, sz, GFP_KERNEL); \ | |
338 | if (!new) \ | |
339 | return -ENOMEM; \ | |
340 | new[strcspn(new, "\n")] = '\0'; \ | |
341 | \ | |
342 | device_lock(dev); \ | |
343 | old = rpdev->member; \ | |
344 | if (strlen(new)) { \ | |
345 | rpdev->member = new; \ | |
346 | } else { \ | |
347 | kfree(new); \ | |
348 | rpdev->member = NULL; \ | |
349 | } \ | |
350 | device_unlock(dev); \ | |
351 | \ | |
352 | kfree(old); \ | |
353 | \ | |
354 | return sz; \ | |
355 | } \ | |
356 | static ssize_t \ | |
357 | field##_show(struct device *dev, \ | |
358 | struct device_attribute *attr, char *buf) \ | |
359 | { \ | |
360 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ | |
361 | \ | |
362 | return sprintf(buf, "%s\n", rpdev->member); \ | |
363 | } \ | |
364 | static DEVICE_ATTR_RW(field) | |
365 | ||
5e619b48 BA |
366 | /* for more info, see Documentation/ABI/testing/sysfs-bus-rpmsg */ |
367 | rpmsg_show_attr(name, id.name, "%s\n"); | |
368 | rpmsg_show_attr(src, src, "0x%x\n"); | |
369 | rpmsg_show_attr(dst, dst, "0x%x\n"); | |
370 | rpmsg_show_attr(announce, announce ? "true" : "false", "%s\n"); | |
39e47767 | 371 | rpmsg_string_attr(driver_override, driver_override); |
5e619b48 BA |
372 | |
373 | static ssize_t modalias_show(struct device *dev, | |
374 | struct device_attribute *attr, char *buf) | |
375 | { | |
376 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
f4ce8528 BA |
377 | ssize_t len; |
378 | ||
379 | len = of_device_modalias(dev, buf, PAGE_SIZE); | |
380 | if (len != -ENODEV) | |
381 | return len; | |
5e619b48 BA |
382 | |
383 | return sprintf(buf, RPMSG_DEVICE_MODALIAS_FMT "\n", rpdev->id.name); | |
384 | } | |
39afc7af GKH |
385 | static DEVICE_ATTR_RO(modalias); |
386 | ||
387 | static struct attribute *rpmsg_dev_attrs[] = { | |
388 | &dev_attr_name.attr, | |
389 | &dev_attr_modalias.attr, | |
390 | &dev_attr_dst.attr, | |
391 | &dev_attr_src.attr, | |
392 | &dev_attr_announce.attr, | |
39e47767 | 393 | &dev_attr_driver_override.attr, |
39afc7af | 394 | NULL, |
5e619b48 | 395 | }; |
39afc7af | 396 | ATTRIBUTE_GROUPS(rpmsg_dev); |
5e619b48 BA |
397 | |
398 | /* rpmsg devices and drivers are matched using the service name */ | |
399 | static inline int rpmsg_id_match(const struct rpmsg_device *rpdev, | |
400 | const struct rpmsg_device_id *id) | |
401 | { | |
402 | return strncmp(id->name, rpdev->id.name, RPMSG_NAME_SIZE) == 0; | |
403 | } | |
404 | ||
405 | /* match rpmsg channel and rpmsg driver */ | |
406 | static int rpmsg_dev_match(struct device *dev, struct device_driver *drv) | |
407 | { | |
408 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
409 | struct rpmsg_driver *rpdrv = to_rpmsg_driver(drv); | |
410 | const struct rpmsg_device_id *ids = rpdrv->id_table; | |
411 | unsigned int i; | |
412 | ||
e9506047 BA |
413 | if (rpdev->driver_override) |
414 | return !strcmp(rpdev->driver_override, drv->name); | |
415 | ||
5e619b48 BA |
416 | if (ids) |
417 | for (i = 0; ids[i].name[0]; i++) | |
418 | if (rpmsg_id_match(rpdev, &ids[i])) | |
419 | return 1; | |
420 | ||
421 | return of_driver_match_device(dev, drv); | |
422 | } | |
423 | ||
424 | static int rpmsg_uevent(struct device *dev, struct kobj_uevent_env *env) | |
425 | { | |
426 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
f4ce8528 BA |
427 | int ret; |
428 | ||
429 | ret = of_device_uevent_modalias(dev, env); | |
430 | if (ret != -ENODEV) | |
431 | return ret; | |
5e619b48 BA |
432 | |
433 | return add_uevent_var(env, "MODALIAS=" RPMSG_DEVICE_MODALIAS_FMT, | |
434 | rpdev->id.name); | |
435 | } | |
436 | ||
437 | /* | |
438 | * when an rpmsg driver is probed with a channel, we seamlessly create | |
439 | * it an endpoint, binding its rx callback to a unique local rpmsg | |
440 | * address. | |
441 | * | |
442 | * if we need to, we also announce about this channel to the remote | |
443 | * processor (needed in case the driver is exposing an rpmsg service). | |
444 | */ | |
445 | static int rpmsg_dev_probe(struct device *dev) | |
446 | { | |
447 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
448 | struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver); | |
449 | struct rpmsg_channel_info chinfo = {}; | |
bbd18809 | 450 | struct rpmsg_endpoint *ept = NULL; |
5e619b48 BA |
451 | int err; |
452 | ||
fe782aff SK |
453 | err = dev_pm_domain_attach(dev, true); |
454 | if (err) | |
455 | goto out; | |
456 | ||
bbd18809 BA |
457 | if (rpdrv->callback) { |
458 | strncpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE); | |
459 | chinfo.src = rpdev->src; | |
460 | chinfo.dst = RPMSG_ADDR_ANY; | |
5e619b48 | 461 | |
bbd18809 BA |
462 | ept = rpmsg_create_ept(rpdev, rpdrv->callback, NULL, chinfo); |
463 | if (!ept) { | |
464 | dev_err(dev, "failed to create endpoint\n"); | |
465 | err = -ENOMEM; | |
466 | goto out; | |
467 | } | |
5e619b48 | 468 | |
bbd18809 BA |
469 | rpdev->ept = ept; |
470 | rpdev->src = ept->addr; | |
471 | } | |
5e619b48 BA |
472 | |
473 | err = rpdrv->probe(rpdev); | |
474 | if (err) { | |
475 | dev_err(dev, "%s: failed: %d\n", __func__, err); | |
bbd18809 BA |
476 | if (ept) |
477 | rpmsg_destroy_ept(ept); | |
5e619b48 BA |
478 | goto out; |
479 | } | |
480 | ||
7586516c | 481 | if (ept && rpdev->ops->announce_create) |
5e619b48 BA |
482 | err = rpdev->ops->announce_create(rpdev); |
483 | out: | |
484 | return err; | |
485 | } | |
486 | ||
487 | static int rpmsg_dev_remove(struct device *dev) | |
488 | { | |
489 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
490 | struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver); | |
491 | int err = 0; | |
492 | ||
493 | if (rpdev->ops->announce_destroy) | |
494 | err = rpdev->ops->announce_destroy(rpdev); | |
495 | ||
496 | rpdrv->remove(rpdev); | |
497 | ||
fe782aff SK |
498 | dev_pm_domain_detach(dev, true); |
499 | ||
bbd18809 BA |
500 | if (rpdev->ept) |
501 | rpmsg_destroy_ept(rpdev->ept); | |
5e619b48 BA |
502 | |
503 | return err; | |
504 | } | |
505 | ||
506 | static struct bus_type rpmsg_bus = { | |
507 | .name = "rpmsg", | |
508 | .match = rpmsg_dev_match, | |
39afc7af | 509 | .dev_groups = rpmsg_dev_groups, |
5e619b48 BA |
510 | .uevent = rpmsg_uevent, |
511 | .probe = rpmsg_dev_probe, | |
512 | .remove = rpmsg_dev_remove, | |
513 | }; | |
514 | ||
5e619b48 BA |
515 | int rpmsg_register_device(struct rpmsg_device *rpdev) |
516 | { | |
517 | struct device *dev = &rpdev->dev; | |
518 | int ret; | |
519 | ||
63447646 LP |
520 | dev_set_name(&rpdev->dev, "%s.%s.%d.%d", dev_name(dev->parent), |
521 | rpdev->id.name, rpdev->src, rpdev->dst); | |
5e619b48 BA |
522 | |
523 | rpdev->dev.bus = &rpmsg_bus; | |
5e619b48 BA |
524 | |
525 | ret = device_register(&rpdev->dev); | |
526 | if (ret) { | |
527 | dev_err(dev, "device_register failed: %d\n", ret); | |
528 | put_device(&rpdev->dev); | |
529 | } | |
530 | ||
531 | return ret; | |
532 | } | |
533 | EXPORT_SYMBOL(rpmsg_register_device); | |
534 | ||
535 | /* | |
536 | * find an existing channel using its name + address properties, | |
537 | * and destroy it | |
538 | */ | |
539 | int rpmsg_unregister_device(struct device *parent, | |
540 | struct rpmsg_channel_info *chinfo) | |
541 | { | |
542 | struct device *dev; | |
543 | ||
544 | dev = rpmsg_find_device(parent, chinfo); | |
545 | if (!dev) | |
546 | return -EINVAL; | |
547 | ||
548 | device_unregister(dev); | |
549 | ||
550 | put_device(dev); | |
551 | ||
552 | return 0; | |
553 | } | |
554 | EXPORT_SYMBOL(rpmsg_unregister_device); | |
555 | ||
556 | /** | |
557 | * __register_rpmsg_driver() - register an rpmsg driver with the rpmsg bus | |
558 | * @rpdrv: pointer to a struct rpmsg_driver | |
559 | * @owner: owning module/driver | |
560 | * | |
561 | * Returns 0 on success, and an appropriate error value on failure. | |
562 | */ | |
563 | int __register_rpmsg_driver(struct rpmsg_driver *rpdrv, struct module *owner) | |
564 | { | |
565 | rpdrv->drv.bus = &rpmsg_bus; | |
566 | rpdrv->drv.owner = owner; | |
567 | return driver_register(&rpdrv->drv); | |
568 | } | |
569 | EXPORT_SYMBOL(__register_rpmsg_driver); | |
570 | ||
571 | /** | |
572 | * unregister_rpmsg_driver() - unregister an rpmsg driver from the rpmsg bus | |
573 | * @rpdrv: pointer to a struct rpmsg_driver | |
574 | * | |
575 | * Returns 0 on success, and an appropriate error value on failure. | |
576 | */ | |
577 | void unregister_rpmsg_driver(struct rpmsg_driver *rpdrv) | |
578 | { | |
579 | driver_unregister(&rpdrv->drv); | |
580 | } | |
581 | EXPORT_SYMBOL(unregister_rpmsg_driver); | |
582 | ||
583 | ||
584 | static int __init rpmsg_init(void) | |
585 | { | |
586 | int ret; | |
587 | ||
588 | ret = bus_register(&rpmsg_bus); | |
589 | if (ret) | |
590 | pr_err("failed to register rpmsg bus: %d\n", ret); | |
591 | ||
592 | return ret; | |
593 | } | |
594 | postcore_initcall(rpmsg_init); | |
595 | ||
596 | static void __exit rpmsg_fini(void) | |
597 | { | |
598 | bus_unregister(&rpmsg_bus); | |
599 | } | |
600 | module_exit(rpmsg_fini); | |
601 | ||
602 | MODULE_DESCRIPTION("remote processor messaging bus"); | |
603 | MODULE_LICENSE("GPL v2"); |