]>
Commit | Line | Data |
---|---|---|
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 | ||
9753e12c AP |
23 | /** |
24 | * rpmsg_create_channel() - create a new rpmsg channel | |
25 | * using its name and address info. | |
26 | * @rpdev: rpmsg device | |
27 | * @chinfo: channel_info to bind | |
28 | * | |
29 | * Returns a pointer to the new rpmsg device on success, or NULL on error. | |
30 | */ | |
31 | struct rpmsg_device *rpmsg_create_channel(struct rpmsg_device *rpdev, | |
32 | struct rpmsg_channel_info *chinfo) | |
33 | { | |
34 | if (WARN_ON(!rpdev)) | |
35 | return NULL; | |
36 | if (!rpdev->ops || !rpdev->ops->create_channel) { | |
37 | dev_err(&rpdev->dev, "no create_channel ops found\n"); | |
38 | return NULL; | |
39 | } | |
40 | ||
41 | return rpdev->ops->create_channel(rpdev, chinfo); | |
42 | } | |
43 | EXPORT_SYMBOL(rpmsg_create_channel); | |
44 | ||
45 | /** | |
46 | * rpmsg_release_channel() - release a rpmsg channel | |
47 | * using its name and address info. | |
48 | * @rpdev: rpmsg device | |
49 | * @chinfo: channel_info to bind | |
50 | * | |
51 | * Returns 0 on success or an appropriate error value. | |
52 | */ | |
53 | int rpmsg_release_channel(struct rpmsg_device *rpdev, | |
54 | struct rpmsg_channel_info *chinfo) | |
55 | { | |
56 | if (WARN_ON(!rpdev)) | |
57 | return -EINVAL; | |
58 | if (!rpdev->ops || !rpdev->ops->release_channel) { | |
59 | dev_err(&rpdev->dev, "no release_channel ops found\n"); | |
60 | return -ENXIO; | |
61 | } | |
62 | ||
63 | return rpdev->ops->release_channel(rpdev, chinfo); | |
64 | } | |
65 | EXPORT_SYMBOL(rpmsg_release_channel); | |
66 | ||
026dad47 BA |
67 | /** |
68 | * rpmsg_create_ept() - create a new rpmsg_endpoint | |
69 | * @rpdev: rpmsg channel device | |
70 | * @cb: rx callback handler | |
71 | * @priv: private data for the driver's use | |
72 | * @chinfo: channel_info with the local rpmsg address to bind with @cb | |
73 | * | |
74 | * Every rpmsg address in the system is bound to an rx callback (so when | |
75 | * inbound messages arrive, they are dispatched by the rpmsg bus using the | |
76 | * appropriate callback handler) by means of an rpmsg_endpoint struct. | |
77 | * | |
78 | * This function allows drivers to create such an endpoint, and by that, | |
79 | * bind a callback, and possibly some private data too, to an rpmsg address | |
80 | * (either one that is known in advance, or one that will be dynamically | |
81 | * assigned for them). | |
82 | * | |
83 | * Simple rpmsg drivers need not call rpmsg_create_ept, because an endpoint | |
84 | * is already created for them when they are probed by the rpmsg bus | |
85 | * (using the rx callback provided when they registered to the rpmsg bus). | |
86 | * | |
87 | * So things should just work for simple drivers: they already have an | |
88 | * endpoint, their rx callback is bound to their rpmsg address, and when | |
89 | * relevant inbound messages arrive (i.e. messages which their dst address | |
90 | * equals to the src address of their rpmsg channel), the driver's handler | |
91 | * is invoked to process it. | |
92 | * | |
9ff166de | 93 | * That said, more complicated drivers might need to allocate |
026dad47 BA |
94 | * additional rpmsg addresses, and bind them to different rx callbacks. |
95 | * To accomplish that, those drivers need to call this function. | |
96 | * | |
97 | * Drivers should provide their @rpdev channel (so the new endpoint would belong | |
98 | * to the same remote processor their channel belongs to), an rx callback | |
99 | * function, an optional private data (which is provided back when the | |
100 | * rx callback is invoked), and an address they want to bind with the | |
101 | * callback. If @addr is RPMSG_ADDR_ANY, then rpmsg_create_ept will | |
102 | * dynamically assign them an available rpmsg address (drivers should have | |
103 | * a very good reason why not to always use RPMSG_ADDR_ANY here). | |
104 | * | |
105 | * Returns a pointer to the endpoint on success, or NULL on error. | |
106 | */ | |
107 | struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev, | |
108 | rpmsg_rx_cb_t cb, void *priv, | |
109 | struct rpmsg_channel_info chinfo) | |
110 | { | |
93e93244 | 111 | if (WARN_ON(!rpdev)) |
fa04b769 | 112 | return NULL; |
93e93244 | 113 | |
026dad47 BA |
114 | return rpdev->ops->create_ept(rpdev, cb, priv, chinfo); |
115 | } | |
116 | EXPORT_SYMBOL(rpmsg_create_ept); | |
c9bd6f42 BA |
117 | |
118 | /** | |
119 | * rpmsg_destroy_ept() - destroy an existing rpmsg endpoint | |
120 | * @ept: endpoing to destroy | |
121 | * | |
122 | * Should be used by drivers to destroy an rpmsg endpoint previously | |
93e93244 BA |
123 | * created with rpmsg_create_ept(). As with other types of "free" NULL |
124 | * is a valid parameter. | |
c9bd6f42 BA |
125 | */ |
126 | void rpmsg_destroy_ept(struct rpmsg_endpoint *ept) | |
127 | { | |
d5158cda | 128 | if (ept && ept->ops) |
93e93244 | 129 | ept->ops->destroy_ept(ept); |
c9bd6f42 BA |
130 | } |
131 | EXPORT_SYMBOL(rpmsg_destroy_ept); | |
132 | ||
133 | /** | |
134 | * rpmsg_send() - send a message across to the remote processor | |
135 | * @ept: the rpmsg endpoint | |
136 | * @data: payload of message | |
137 | * @len: length of payload | |
138 | * | |
139 | * This function sends @data of length @len on the @ept endpoint. | |
140 | * The message will be sent to the remote processor which the @ept | |
141 | * endpoint belongs to, using @ept's address and its associated rpmsg | |
142 | * device destination addresses. | |
143 | * In case there are no TX buffers available, the function will block until | |
144 | * one becomes available, or a timeout of 15 seconds elapses. When the latter | |
145 | * happens, -ERESTARTSYS is returned. | |
146 | * | |
147 | * Can only be called from process context (for now). | |
148 | * | |
149 | * Returns 0 on success and an appropriate error value on failure. | |
150 | */ | |
151 | int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len) | |
152 | { | |
93e93244 BA |
153 | if (WARN_ON(!ept)) |
154 | return -EINVAL; | |
155 | if (!ept->ops->send) | |
156 | return -ENXIO; | |
157 | ||
c9bd6f42 BA |
158 | return ept->ops->send(ept, data, len); |
159 | } | |
160 | EXPORT_SYMBOL(rpmsg_send); | |
161 | ||
162 | /** | |
163 | * rpmsg_sendto() - send a message across to the remote processor, specify dst | |
164 | * @ept: the rpmsg endpoint | |
165 | * @data: payload of message | |
166 | * @len: length of payload | |
167 | * @dst: destination address | |
168 | * | |
169 | * This function sends @data of length @len to the remote @dst address. | |
170 | * The message will be sent to the remote processor which the @ept | |
171 | * endpoint belongs to, using @ept's address as source. | |
172 | * In case there are no TX buffers available, the function will block until | |
173 | * one becomes available, or a timeout of 15 seconds elapses. When the latter | |
174 | * happens, -ERESTARTSYS is returned. | |
175 | * | |
176 | * Can only be called from process context (for now). | |
177 | * | |
178 | * Returns 0 on success and an appropriate error value on failure. | |
179 | */ | |
180 | int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) | |
181 | { | |
93e93244 BA |
182 | if (WARN_ON(!ept)) |
183 | return -EINVAL; | |
184 | if (!ept->ops->sendto) | |
185 | return -ENXIO; | |
186 | ||
c9bd6f42 BA |
187 | return ept->ops->sendto(ept, data, len, dst); |
188 | } | |
189 | EXPORT_SYMBOL(rpmsg_sendto); | |
190 | ||
191 | /** | |
192 | * rpmsg_send_offchannel() - send a message using explicit src/dst addresses | |
193 | * @ept: the rpmsg endpoint | |
194 | * @src: source address | |
195 | * @dst: destination address | |
196 | * @data: payload of message | |
197 | * @len: length of payload | |
198 | * | |
199 | * This function sends @data of length @len to the remote @dst address, | |
200 | * and uses @src as the source address. | |
201 | * The message will be sent to the remote processor which the @ept | |
202 | * endpoint belongs to. | |
203 | * In case there are no TX buffers available, the function will block until | |
204 | * one becomes available, or a timeout of 15 seconds elapses. When the latter | |
205 | * happens, -ERESTARTSYS is returned. | |
206 | * | |
207 | * Can only be called from process context (for now). | |
208 | * | |
209 | * Returns 0 on success and an appropriate error value on failure. | |
210 | */ | |
211 | int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, | |
212 | void *data, int len) | |
213 | { | |
93e93244 BA |
214 | if (WARN_ON(!ept)) |
215 | return -EINVAL; | |
216 | if (!ept->ops->send_offchannel) | |
217 | return -ENXIO; | |
218 | ||
c9bd6f42 BA |
219 | return ept->ops->send_offchannel(ept, src, dst, data, len); |
220 | } | |
221 | EXPORT_SYMBOL(rpmsg_send_offchannel); | |
222 | ||
223 | /** | |
9ff166de | 224 | * rpmsg_trysend() - send a message across to the remote processor |
c9bd6f42 BA |
225 | * @ept: the rpmsg endpoint |
226 | * @data: payload of message | |
227 | * @len: length of payload | |
228 | * | |
229 | * This function sends @data of length @len on the @ept endpoint. | |
230 | * The message will be sent to the remote processor which the @ept | |
231 | * endpoint belongs to, using @ept's address as source and its associated | |
232 | * rpdev's address as destination. | |
233 | * In case there are no TX buffers available, the function will immediately | |
234 | * return -ENOMEM without waiting until one becomes available. | |
235 | * | |
236 | * Can only be called from process context (for now). | |
237 | * | |
238 | * Returns 0 on success and an appropriate error value on failure. | |
239 | */ | |
240 | int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len) | |
241 | { | |
93e93244 BA |
242 | if (WARN_ON(!ept)) |
243 | return -EINVAL; | |
244 | if (!ept->ops->trysend) | |
245 | return -ENXIO; | |
246 | ||
c9bd6f42 BA |
247 | return ept->ops->trysend(ept, data, len); |
248 | } | |
249 | EXPORT_SYMBOL(rpmsg_trysend); | |
250 | ||
251 | /** | |
9ff166de | 252 | * rpmsg_trysendto() - send a message across to the remote processor, specify dst |
c9bd6f42 BA |
253 | * @ept: the rpmsg endpoint |
254 | * @data: payload of message | |
255 | * @len: length of payload | |
256 | * @dst: destination address | |
257 | * | |
258 | * This function sends @data of length @len to the remote @dst address. | |
259 | * The message will be sent to the remote processor which the @ept | |
260 | * endpoint belongs to, using @ept's address as source. | |
261 | * In case there are no TX buffers available, the function will immediately | |
262 | * return -ENOMEM without waiting until one becomes available. | |
263 | * | |
264 | * Can only be called from process context (for now). | |
265 | * | |
266 | * Returns 0 on success and an appropriate error value on failure. | |
267 | */ | |
268 | int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) | |
269 | { | |
93e93244 BA |
270 | if (WARN_ON(!ept)) |
271 | return -EINVAL; | |
272 | if (!ept->ops->trysendto) | |
273 | return -ENXIO; | |
274 | ||
c9bd6f42 BA |
275 | return ept->ops->trysendto(ept, data, len, dst); |
276 | } | |
277 | EXPORT_SYMBOL(rpmsg_trysendto); | |
278 | ||
84d58132 BA |
279 | /** |
280 | * rpmsg_poll() - poll the endpoint's send buffers | |
281 | * @ept: the rpmsg endpoint | |
282 | * @filp: file for poll_wait() | |
283 | * @wait: poll_table for poll_wait() | |
284 | * | |
285 | * Returns mask representing the current state of the endpoint's send buffers | |
286 | */ | |
afc9a42b | 287 | __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp, |
84d58132 BA |
288 | poll_table *wait) |
289 | { | |
290 | if (WARN_ON(!ept)) | |
291 | return 0; | |
292 | if (!ept->ops->poll) | |
293 | return 0; | |
294 | ||
295 | return ept->ops->poll(ept, filp, wait); | |
296 | } | |
297 | EXPORT_SYMBOL(rpmsg_poll); | |
298 | ||
c9bd6f42 | 299 | /** |
9ff166de | 300 | * rpmsg_trysend_offchannel() - send a message using explicit src/dst addresses |
c9bd6f42 BA |
301 | * @ept: the rpmsg endpoint |
302 | * @src: source address | |
303 | * @dst: destination address | |
304 | * @data: payload of message | |
305 | * @len: length of payload | |
306 | * | |
307 | * This function sends @data of length @len to the remote @dst address, | |
308 | * and uses @src as the source address. | |
309 | * The message will be sent to the remote processor which the @ept | |
310 | * endpoint belongs to. | |
311 | * In case there are no TX buffers available, the function will immediately | |
312 | * return -ENOMEM without waiting until one becomes available. | |
313 | * | |
314 | * Can only be called from process context (for now). | |
315 | * | |
316 | * Returns 0 on success and an appropriate error value on failure. | |
317 | */ | |
318 | int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, | |
319 | void *data, int len) | |
320 | { | |
93e93244 BA |
321 | if (WARN_ON(!ept)) |
322 | return -EINVAL; | |
323 | if (!ept->ops->trysend_offchannel) | |
324 | return -ENXIO; | |
325 | ||
c9bd6f42 BA |
326 | return ept->ops->trysend_offchannel(ept, src, dst, data, len); |
327 | } | |
328 | EXPORT_SYMBOL(rpmsg_trysend_offchannel); | |
8b881c07 BA |
329 | |
330 | /* | |
075894d4 | 331 | * match a rpmsg channel with a channel info struct. |
8b881c07 BA |
332 | * this is used to make sure we're not creating rpmsg devices for channels |
333 | * that already exist. | |
334 | */ | |
335 | static int rpmsg_device_match(struct device *dev, void *data) | |
336 | { | |
337 | struct rpmsg_channel_info *chinfo = data; | |
338 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
339 | ||
340 | if (chinfo->src != RPMSG_ADDR_ANY && chinfo->src != rpdev->src) | |
341 | return 0; | |
342 | ||
343 | if (chinfo->dst != RPMSG_ADDR_ANY && chinfo->dst != rpdev->dst) | |
344 | return 0; | |
345 | ||
346 | if (strncmp(chinfo->name, rpdev->id.name, RPMSG_NAME_SIZE)) | |
347 | return 0; | |
348 | ||
349 | /* found a match ! */ | |
350 | return 1; | |
351 | } | |
352 | ||
353 | struct device *rpmsg_find_device(struct device *parent, | |
354 | struct rpmsg_channel_info *chinfo) | |
355 | { | |
356 | return device_find_child(parent, chinfo, rpmsg_device_match); | |
357 | ||
358 | } | |
359 | EXPORT_SYMBOL(rpmsg_find_device); | |
5e619b48 BA |
360 | |
361 | /* sysfs show configuration fields */ | |
362 | #define rpmsg_show_attr(field, path, format_string) \ | |
363 | static ssize_t \ | |
364 | field##_show(struct device *dev, \ | |
365 | struct device_attribute *attr, char *buf) \ | |
366 | { \ | |
367 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ | |
368 | \ | |
369 | return sprintf(buf, format_string, rpdev->path); \ | |
39afc7af GKH |
370 | } \ |
371 | static DEVICE_ATTR_RO(field); | |
5e619b48 | 372 | |
39e47767 AP |
373 | #define rpmsg_string_attr(field, member) \ |
374 | static ssize_t \ | |
375 | field##_store(struct device *dev, struct device_attribute *attr, \ | |
376 | const char *buf, size_t sz) \ | |
377 | { \ | |
378 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ | |
379 | char *new, *old; \ | |
380 | \ | |
381 | new = kstrndup(buf, sz, GFP_KERNEL); \ | |
382 | if (!new) \ | |
383 | return -ENOMEM; \ | |
384 | new[strcspn(new, "\n")] = '\0'; \ | |
385 | \ | |
386 | device_lock(dev); \ | |
387 | old = rpdev->member; \ | |
388 | if (strlen(new)) { \ | |
389 | rpdev->member = new; \ | |
390 | } else { \ | |
391 | kfree(new); \ | |
392 | rpdev->member = NULL; \ | |
393 | } \ | |
394 | device_unlock(dev); \ | |
395 | \ | |
396 | kfree(old); \ | |
397 | \ | |
398 | return sz; \ | |
399 | } \ | |
400 | static ssize_t \ | |
401 | field##_show(struct device *dev, \ | |
402 | struct device_attribute *attr, char *buf) \ | |
403 | { \ | |
404 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ | |
405 | \ | |
406 | return sprintf(buf, "%s\n", rpdev->member); \ | |
407 | } \ | |
408 | static DEVICE_ATTR_RW(field) | |
409 | ||
5e619b48 BA |
410 | /* for more info, see Documentation/ABI/testing/sysfs-bus-rpmsg */ |
411 | rpmsg_show_attr(name, id.name, "%s\n"); | |
412 | rpmsg_show_attr(src, src, "0x%x\n"); | |
413 | rpmsg_show_attr(dst, dst, "0x%x\n"); | |
414 | rpmsg_show_attr(announce, announce ? "true" : "false", "%s\n"); | |
39e47767 | 415 | rpmsg_string_attr(driver_override, driver_override); |
5e619b48 BA |
416 | |
417 | static ssize_t modalias_show(struct device *dev, | |
418 | struct device_attribute *attr, char *buf) | |
419 | { | |
420 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
f4ce8528 BA |
421 | ssize_t len; |
422 | ||
423 | len = of_device_modalias(dev, buf, PAGE_SIZE); | |
424 | if (len != -ENODEV) | |
425 | return len; | |
5e619b48 BA |
426 | |
427 | return sprintf(buf, RPMSG_DEVICE_MODALIAS_FMT "\n", rpdev->id.name); | |
428 | } | |
39afc7af GKH |
429 | static DEVICE_ATTR_RO(modalias); |
430 | ||
431 | static struct attribute *rpmsg_dev_attrs[] = { | |
432 | &dev_attr_name.attr, | |
433 | &dev_attr_modalias.attr, | |
434 | &dev_attr_dst.attr, | |
435 | &dev_attr_src.attr, | |
436 | &dev_attr_announce.attr, | |
39e47767 | 437 | &dev_attr_driver_override.attr, |
39afc7af | 438 | NULL, |
5e619b48 | 439 | }; |
39afc7af | 440 | ATTRIBUTE_GROUPS(rpmsg_dev); |
5e619b48 BA |
441 | |
442 | /* rpmsg devices and drivers are matched using the service name */ | |
443 | static inline int rpmsg_id_match(const struct rpmsg_device *rpdev, | |
444 | const struct rpmsg_device_id *id) | |
445 | { | |
446 | return strncmp(id->name, rpdev->id.name, RPMSG_NAME_SIZE) == 0; | |
447 | } | |
448 | ||
449 | /* match rpmsg channel and rpmsg driver */ | |
450 | static int rpmsg_dev_match(struct device *dev, struct device_driver *drv) | |
451 | { | |
452 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
453 | struct rpmsg_driver *rpdrv = to_rpmsg_driver(drv); | |
454 | const struct rpmsg_device_id *ids = rpdrv->id_table; | |
455 | unsigned int i; | |
456 | ||
e9506047 BA |
457 | if (rpdev->driver_override) |
458 | return !strcmp(rpdev->driver_override, drv->name); | |
459 | ||
5e619b48 BA |
460 | if (ids) |
461 | for (i = 0; ids[i].name[0]; i++) | |
462 | if (rpmsg_id_match(rpdev, &ids[i])) | |
463 | return 1; | |
464 | ||
465 | return of_driver_match_device(dev, drv); | |
466 | } | |
467 | ||
468 | static int rpmsg_uevent(struct device *dev, struct kobj_uevent_env *env) | |
469 | { | |
470 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
f4ce8528 BA |
471 | int ret; |
472 | ||
473 | ret = of_device_uevent_modalias(dev, env); | |
474 | if (ret != -ENODEV) | |
475 | return ret; | |
5e619b48 BA |
476 | |
477 | return add_uevent_var(env, "MODALIAS=" RPMSG_DEVICE_MODALIAS_FMT, | |
478 | rpdev->id.name); | |
479 | } | |
480 | ||
481 | /* | |
482 | * when an rpmsg driver is probed with a channel, we seamlessly create | |
483 | * it an endpoint, binding its rx callback to a unique local rpmsg | |
484 | * address. | |
485 | * | |
486 | * if we need to, we also announce about this channel to the remote | |
487 | * processor (needed in case the driver is exposing an rpmsg service). | |
488 | */ | |
489 | static int rpmsg_dev_probe(struct device *dev) | |
490 | { | |
491 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
492 | struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver); | |
493 | struct rpmsg_channel_info chinfo = {}; | |
bbd18809 | 494 | struct rpmsg_endpoint *ept = NULL; |
5e619b48 BA |
495 | int err; |
496 | ||
fe782aff SK |
497 | err = dev_pm_domain_attach(dev, true); |
498 | if (err) | |
499 | goto out; | |
500 | ||
bbd18809 BA |
501 | if (rpdrv->callback) { |
502 | strncpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE); | |
503 | chinfo.src = rpdev->src; | |
504 | chinfo.dst = RPMSG_ADDR_ANY; | |
5e619b48 | 505 | |
bbd18809 BA |
506 | ept = rpmsg_create_ept(rpdev, rpdrv->callback, NULL, chinfo); |
507 | if (!ept) { | |
508 | dev_err(dev, "failed to create endpoint\n"); | |
509 | err = -ENOMEM; | |
510 | goto out; | |
511 | } | |
5e619b48 | 512 | |
bbd18809 BA |
513 | rpdev->ept = ept; |
514 | rpdev->src = ept->addr; | |
515 | } | |
5e619b48 BA |
516 | |
517 | err = rpdrv->probe(rpdev); | |
518 | if (err) { | |
519 | dev_err(dev, "%s: failed: %d\n", __func__, err); | |
bbd18809 BA |
520 | if (ept) |
521 | rpmsg_destroy_ept(ept); | |
5e619b48 BA |
522 | goto out; |
523 | } | |
524 | ||
7586516c | 525 | if (ept && rpdev->ops->announce_create) |
5e619b48 BA |
526 | err = rpdev->ops->announce_create(rpdev); |
527 | out: | |
528 | return err; | |
529 | } | |
530 | ||
531 | static int rpmsg_dev_remove(struct device *dev) | |
532 | { | |
533 | struct rpmsg_device *rpdev = to_rpmsg_device(dev); | |
534 | struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver); | |
535 | int err = 0; | |
536 | ||
537 | if (rpdev->ops->announce_destroy) | |
538 | err = rpdev->ops->announce_destroy(rpdev); | |
539 | ||
54119bc1 PHS |
540 | if (rpdrv->remove) |
541 | rpdrv->remove(rpdev); | |
5e619b48 | 542 | |
fe782aff SK |
543 | dev_pm_domain_detach(dev, true); |
544 | ||
bbd18809 BA |
545 | if (rpdev->ept) |
546 | rpmsg_destroy_ept(rpdev->ept); | |
5e619b48 BA |
547 | |
548 | return err; | |
549 | } | |
550 | ||
551 | static struct bus_type rpmsg_bus = { | |
552 | .name = "rpmsg", | |
553 | .match = rpmsg_dev_match, | |
39afc7af | 554 | .dev_groups = rpmsg_dev_groups, |
5e619b48 BA |
555 | .uevent = rpmsg_uevent, |
556 | .probe = rpmsg_dev_probe, | |
557 | .remove = rpmsg_dev_remove, | |
558 | }; | |
559 | ||
5e619b48 BA |
560 | int rpmsg_register_device(struct rpmsg_device *rpdev) |
561 | { | |
562 | struct device *dev = &rpdev->dev; | |
563 | int ret; | |
564 | ||
63447646 LP |
565 | dev_set_name(&rpdev->dev, "%s.%s.%d.%d", dev_name(dev->parent), |
566 | rpdev->id.name, rpdev->src, rpdev->dst); | |
5e619b48 BA |
567 | |
568 | rpdev->dev.bus = &rpmsg_bus; | |
5e619b48 BA |
569 | |
570 | ret = device_register(&rpdev->dev); | |
571 | if (ret) { | |
572 | dev_err(dev, "device_register failed: %d\n", ret); | |
573 | put_device(&rpdev->dev); | |
574 | } | |
575 | ||
576 | return ret; | |
577 | } | |
578 | EXPORT_SYMBOL(rpmsg_register_device); | |
579 | ||
580 | /* | |
581 | * find an existing channel using its name + address properties, | |
582 | * and destroy it | |
583 | */ | |
584 | int rpmsg_unregister_device(struct device *parent, | |
585 | struct rpmsg_channel_info *chinfo) | |
586 | { | |
587 | struct device *dev; | |
588 | ||
589 | dev = rpmsg_find_device(parent, chinfo); | |
590 | if (!dev) | |
591 | return -EINVAL; | |
592 | ||
593 | device_unregister(dev); | |
594 | ||
595 | put_device(dev); | |
596 | ||
597 | return 0; | |
598 | } | |
599 | EXPORT_SYMBOL(rpmsg_unregister_device); | |
600 | ||
601 | /** | |
602 | * __register_rpmsg_driver() - register an rpmsg driver with the rpmsg bus | |
603 | * @rpdrv: pointer to a struct rpmsg_driver | |
604 | * @owner: owning module/driver | |
605 | * | |
606 | * Returns 0 on success, and an appropriate error value on failure. | |
607 | */ | |
608 | int __register_rpmsg_driver(struct rpmsg_driver *rpdrv, struct module *owner) | |
609 | { | |
610 | rpdrv->drv.bus = &rpmsg_bus; | |
611 | rpdrv->drv.owner = owner; | |
612 | return driver_register(&rpdrv->drv); | |
613 | } | |
614 | EXPORT_SYMBOL(__register_rpmsg_driver); | |
615 | ||
616 | /** | |
617 | * unregister_rpmsg_driver() - unregister an rpmsg driver from the rpmsg bus | |
618 | * @rpdrv: pointer to a struct rpmsg_driver | |
619 | * | |
620 | * Returns 0 on success, and an appropriate error value on failure. | |
621 | */ | |
622 | void unregister_rpmsg_driver(struct rpmsg_driver *rpdrv) | |
623 | { | |
624 | driver_unregister(&rpdrv->drv); | |
625 | } | |
626 | EXPORT_SYMBOL(unregister_rpmsg_driver); | |
627 | ||
628 | ||
629 | static int __init rpmsg_init(void) | |
630 | { | |
631 | int ret; | |
632 | ||
633 | ret = bus_register(&rpmsg_bus); | |
634 | if (ret) | |
635 | pr_err("failed to register rpmsg bus: %d\n", ret); | |
636 | ||
637 | return ret; | |
638 | } | |
639 | postcore_initcall(rpmsg_init); | |
640 | ||
641 | static void __exit rpmsg_fini(void) | |
642 | { | |
643 | bus_unregister(&rpmsg_bus); | |
644 | } | |
645 | module_exit(rpmsg_fini); | |
646 | ||
647 | MODULE_DESCRIPTION("remote processor messaging bus"); | |
648 | MODULE_LICENSE("GPL v2"); |