1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * configfs.c - Implementation of configfs interface to the driver stack |
4 | * |
5 | * Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG |
6 | */ |
7 | |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | #include <linux/module.h> |
10 | #include <linux/slab.h> |
11 | #include <linux/init.h> |
12 | #include <linux/configfs.h> |
13 | #include <linux/most.h> |
14 | |
15 | #define MAX_STRING_SIZE 80 |
16 | |
17 | struct mdev_link { |
18 | struct config_item item; |
19 | struct list_head list; |
20 | bool create_link; |
21 | bool destroy_link; |
22 | u16 num_buffers; |
23 | u16 buffer_size; |
24 | u16 subbuffer_size; |
25 | u16 packets_per_xact; |
26 | u16 dbr_size; |
27 | char datatype[MAX_STRING_SIZE]; |
28 | char direction[MAX_STRING_SIZE]; |
29 | char name[MAX_STRING_SIZE]; |
30 | char device[MAX_STRING_SIZE]; |
31 | char channel[MAX_STRING_SIZE]; |
32 | char comp[MAX_STRING_SIZE]; |
33 | char comp_params[MAX_STRING_SIZE]; |
34 | }; |
35 | |
36 | static struct list_head mdev_link_list; |
37 | |
38 | static int set_cfg_buffer_size(struct mdev_link *link) |
39 | { |
40 | return most_set_cfg_buffer_size(mdev: link->device, mdev_ch: link->channel, |
41 | val: link->buffer_size); |
42 | } |
43 | |
44 | static int set_cfg_subbuffer_size(struct mdev_link *link) |
45 | { |
46 | return most_set_cfg_subbuffer_size(mdev: link->device, mdev_ch: link->channel, |
47 | val: link->subbuffer_size); |
48 | } |
49 | |
50 | static int set_cfg_dbr_size(struct mdev_link *link) |
51 | { |
52 | return most_set_cfg_dbr_size(mdev: link->device, mdev_ch: link->channel, |
53 | val: link->dbr_size); |
54 | } |
55 | |
56 | static int set_cfg_num_buffers(struct mdev_link *link) |
57 | { |
58 | return most_set_cfg_num_buffers(mdev: link->device, mdev_ch: link->channel, |
59 | val: link->num_buffers); |
60 | } |
61 | |
62 | static int set_cfg_packets_xact(struct mdev_link *link) |
63 | { |
64 | return most_set_cfg_packets_xact(mdev: link->device, mdev_ch: link->channel, |
65 | val: link->packets_per_xact); |
66 | } |
67 | |
68 | static int set_cfg_direction(struct mdev_link *link) |
69 | { |
70 | return most_set_cfg_direction(mdev: link->device, mdev_ch: link->channel, |
71 | buf: link->direction); |
72 | } |
73 | |
74 | static int set_cfg_datatype(struct mdev_link *link) |
75 | { |
76 | return most_set_cfg_datatype(mdev: link->device, mdev_ch: link->channel, |
77 | buf: link->datatype); |
78 | } |
79 | |
80 | static int (*set_config_val[])(struct mdev_link *link) = { |
81 | set_cfg_buffer_size, |
82 | set_cfg_subbuffer_size, |
83 | set_cfg_dbr_size, |
84 | set_cfg_num_buffers, |
85 | set_cfg_packets_xact, |
86 | set_cfg_direction, |
87 | set_cfg_datatype, |
88 | }; |
89 | |
90 | static struct mdev_link *to_mdev_link(struct config_item *item) |
91 | { |
92 | return container_of(item, struct mdev_link, item); |
93 | } |
94 | |
95 | static int set_config_and_add_link(struct mdev_link *mdev_link) |
96 | { |
97 | int i; |
98 | int ret; |
99 | |
100 | for (i = 0; i < ARRAY_SIZE(set_config_val); i++) { |
101 | ret = set_config_val[i](mdev_link); |
102 | if (ret < 0 && ret != -ENODEV) { |
103 | pr_err("Config failed\n" ); |
104 | return ret; |
105 | } |
106 | } |
107 | |
108 | return most_add_link(mdev: mdev_link->device, mdev_ch: mdev_link->channel, |
109 | comp_name: mdev_link->comp, link_name: mdev_link->name, |
110 | comp_param: mdev_link->comp_params); |
111 | } |
112 | |
113 | static ssize_t mdev_link_create_link_store(struct config_item *item, |
114 | const char *page, size_t count) |
115 | { |
116 | struct mdev_link *mdev_link = to_mdev_link(item); |
117 | bool tmp; |
118 | int ret; |
119 | |
120 | ret = kstrtobool(s: page, res: &tmp); |
121 | if (ret) |
122 | return ret; |
123 | if (!tmp) |
124 | return count; |
125 | ret = set_config_and_add_link(mdev_link); |
126 | if (ret && ret != -ENODEV) |
127 | return ret; |
128 | list_add_tail(new: &mdev_link->list, head: &mdev_link_list); |
129 | mdev_link->create_link = tmp; |
130 | mdev_link->destroy_link = false; |
131 | |
132 | return count; |
133 | } |
134 | |
135 | static ssize_t mdev_link_destroy_link_store(struct config_item *item, |
136 | const char *page, size_t count) |
137 | { |
138 | struct mdev_link *mdev_link = to_mdev_link(item); |
139 | bool tmp; |
140 | int ret; |
141 | |
142 | ret = kstrtobool(s: page, res: &tmp); |
143 | if (ret) |
144 | return ret; |
145 | if (!tmp) |
146 | return count; |
147 | |
148 | ret = most_remove_link(mdev: mdev_link->device, mdev_ch: mdev_link->channel, |
149 | comp_name: mdev_link->comp); |
150 | if (ret) |
151 | return ret; |
152 | if (!list_empty(head: &mdev_link_list)) |
153 | list_del(entry: &mdev_link->list); |
154 | |
155 | mdev_link->destroy_link = tmp; |
156 | |
157 | return count; |
158 | } |
159 | |
160 | static ssize_t mdev_link_direction_show(struct config_item *item, char *page) |
161 | { |
162 | return snprintf(buf: page, PAGE_SIZE, fmt: "%s\n" , to_mdev_link(item)->direction); |
163 | } |
164 | |
165 | static ssize_t mdev_link_direction_store(struct config_item *item, |
166 | const char *page, size_t count) |
167 | { |
168 | struct mdev_link *mdev_link = to_mdev_link(item); |
169 | |
170 | if (!sysfs_streq(s1: page, s2: "dir_rx" ) && !sysfs_streq(s1: page, s2: "rx" ) && |
171 | !sysfs_streq(s1: page, s2: "dir_tx" ) && !sysfs_streq(s1: page, s2: "tx" )) |
172 | return -EINVAL; |
173 | strcpy(p: mdev_link->direction, q: page); |
174 | strim(mdev_link->direction); |
175 | return count; |
176 | } |
177 | |
178 | static ssize_t mdev_link_datatype_show(struct config_item *item, char *page) |
179 | { |
180 | return snprintf(buf: page, PAGE_SIZE, fmt: "%s\n" , to_mdev_link(item)->datatype); |
181 | } |
182 | |
183 | static ssize_t mdev_link_datatype_store(struct config_item *item, |
184 | const char *page, size_t count) |
185 | { |
186 | struct mdev_link *mdev_link = to_mdev_link(item); |
187 | |
188 | if (!sysfs_streq(s1: page, s2: "control" ) && !sysfs_streq(s1: page, s2: "async" ) && |
189 | !sysfs_streq(s1: page, s2: "sync" ) && !sysfs_streq(s1: page, s2: "isoc" ) && |
190 | !sysfs_streq(s1: page, s2: "isoc_avp" )) |
191 | return -EINVAL; |
192 | strcpy(p: mdev_link->datatype, q: page); |
193 | strim(mdev_link->datatype); |
194 | return count; |
195 | } |
196 | |
197 | static ssize_t mdev_link_device_show(struct config_item *item, char *page) |
198 | { |
199 | return snprintf(buf: page, PAGE_SIZE, fmt: "%s\n" , to_mdev_link(item)->device); |
200 | } |
201 | |
202 | static ssize_t mdev_link_device_store(struct config_item *item, |
203 | const char *page, size_t count) |
204 | { |
205 | struct mdev_link *mdev_link = to_mdev_link(item); |
206 | |
207 | strscpy(mdev_link->device, page, sizeof(mdev_link->device)); |
208 | strim(mdev_link->device); |
209 | return count; |
210 | } |
211 | |
212 | static ssize_t mdev_link_channel_show(struct config_item *item, char *page) |
213 | { |
214 | return snprintf(buf: page, PAGE_SIZE, fmt: "%s\n" , to_mdev_link(item)->channel); |
215 | } |
216 | |
217 | static ssize_t mdev_link_channel_store(struct config_item *item, |
218 | const char *page, size_t count) |
219 | { |
220 | struct mdev_link *mdev_link = to_mdev_link(item); |
221 | |
222 | strscpy(mdev_link->channel, page, sizeof(mdev_link->channel)); |
223 | strim(mdev_link->channel); |
224 | return count; |
225 | } |
226 | |
227 | static ssize_t mdev_link_comp_show(struct config_item *item, char *page) |
228 | { |
229 | return snprintf(buf: page, PAGE_SIZE, fmt: "%s\n" , to_mdev_link(item)->comp); |
230 | } |
231 | |
232 | static ssize_t mdev_link_comp_store(struct config_item *item, |
233 | const char *page, size_t count) |
234 | { |
235 | struct mdev_link *mdev_link = to_mdev_link(item); |
236 | |
237 | strscpy(mdev_link->comp, page, sizeof(mdev_link->comp)); |
238 | strim(mdev_link->comp); |
239 | return count; |
240 | } |
241 | |
242 | static ssize_t mdev_link_comp_params_show(struct config_item *item, char *page) |
243 | { |
244 | return snprintf(buf: page, PAGE_SIZE, fmt: "%s\n" , |
245 | to_mdev_link(item)->comp_params); |
246 | } |
247 | |
248 | static ssize_t mdev_link_comp_params_store(struct config_item *item, |
249 | const char *page, size_t count) |
250 | { |
251 | struct mdev_link *mdev_link = to_mdev_link(item); |
252 | |
253 | strscpy(mdev_link->comp_params, page, sizeof(mdev_link->comp_params)); |
254 | strim(mdev_link->comp_params); |
255 | return count; |
256 | } |
257 | |
258 | static ssize_t mdev_link_num_buffers_show(struct config_item *item, char *page) |
259 | { |
260 | return snprintf(buf: page, PAGE_SIZE, fmt: "%d\n" , |
261 | to_mdev_link(item)->num_buffers); |
262 | } |
263 | |
264 | static ssize_t mdev_link_num_buffers_store(struct config_item *item, |
265 | const char *page, size_t count) |
266 | { |
267 | struct mdev_link *mdev_link = to_mdev_link(item); |
268 | int ret; |
269 | |
270 | ret = kstrtou16(s: page, base: 0, res: &mdev_link->num_buffers); |
271 | if (ret) |
272 | return ret; |
273 | return count; |
274 | } |
275 | |
276 | static ssize_t mdev_link_buffer_size_show(struct config_item *item, char *page) |
277 | { |
278 | return snprintf(buf: page, PAGE_SIZE, fmt: "%d\n" , |
279 | to_mdev_link(item)->buffer_size); |
280 | } |
281 | |
282 | static ssize_t mdev_link_buffer_size_store(struct config_item *item, |
283 | const char *page, size_t count) |
284 | { |
285 | struct mdev_link *mdev_link = to_mdev_link(item); |
286 | int ret; |
287 | |
288 | ret = kstrtou16(s: page, base: 0, res: &mdev_link->buffer_size); |
289 | if (ret) |
290 | return ret; |
291 | return count; |
292 | } |
293 | |
294 | static ssize_t mdev_link_subbuffer_size_show(struct config_item *item, |
295 | char *page) |
296 | { |
297 | return snprintf(buf: page, PAGE_SIZE, fmt: "%d\n" , |
298 | to_mdev_link(item)->subbuffer_size); |
299 | } |
300 | |
301 | static ssize_t mdev_link_subbuffer_size_store(struct config_item *item, |
302 | const char *page, size_t count) |
303 | { |
304 | struct mdev_link *mdev_link = to_mdev_link(item); |
305 | int ret; |
306 | |
307 | ret = kstrtou16(s: page, base: 0, res: &mdev_link->subbuffer_size); |
308 | if (ret) |
309 | return ret; |
310 | return count; |
311 | } |
312 | |
313 | static ssize_t mdev_link_packets_per_xact_show(struct config_item *item, |
314 | char *page) |
315 | { |
316 | return snprintf(buf: page, PAGE_SIZE, fmt: "%d\n" , |
317 | to_mdev_link(item)->packets_per_xact); |
318 | } |
319 | |
320 | static ssize_t mdev_link_packets_per_xact_store(struct config_item *item, |
321 | const char *page, size_t count) |
322 | { |
323 | struct mdev_link *mdev_link = to_mdev_link(item); |
324 | int ret; |
325 | |
326 | ret = kstrtou16(s: page, base: 0, res: &mdev_link->packets_per_xact); |
327 | if (ret) |
328 | return ret; |
329 | return count; |
330 | } |
331 | |
332 | static ssize_t mdev_link_dbr_size_show(struct config_item *item, char *page) |
333 | { |
334 | return snprintf(buf: page, PAGE_SIZE, fmt: "%d\n" , to_mdev_link(item)->dbr_size); |
335 | } |
336 | |
337 | static ssize_t mdev_link_dbr_size_store(struct config_item *item, |
338 | const char *page, size_t count) |
339 | { |
340 | struct mdev_link *mdev_link = to_mdev_link(item); |
341 | int ret; |
342 | |
343 | ret = kstrtou16(s: page, base: 0, res: &mdev_link->dbr_size); |
344 | if (ret) |
345 | return ret; |
346 | return count; |
347 | } |
348 | |
349 | CONFIGFS_ATTR_WO(mdev_link_, create_link); |
350 | CONFIGFS_ATTR_WO(mdev_link_, destroy_link); |
351 | CONFIGFS_ATTR(mdev_link_, device); |
352 | CONFIGFS_ATTR(mdev_link_, channel); |
353 | CONFIGFS_ATTR(mdev_link_, comp); |
354 | CONFIGFS_ATTR(mdev_link_, comp_params); |
355 | CONFIGFS_ATTR(mdev_link_, num_buffers); |
356 | CONFIGFS_ATTR(mdev_link_, buffer_size); |
357 | CONFIGFS_ATTR(mdev_link_, subbuffer_size); |
358 | CONFIGFS_ATTR(mdev_link_, packets_per_xact); |
359 | CONFIGFS_ATTR(mdev_link_, datatype); |
360 | CONFIGFS_ATTR(mdev_link_, direction); |
361 | CONFIGFS_ATTR(mdev_link_, dbr_size); |
362 | |
363 | static struct configfs_attribute *mdev_link_attrs[] = { |
364 | &mdev_link_attr_create_link, |
365 | &mdev_link_attr_destroy_link, |
366 | &mdev_link_attr_device, |
367 | &mdev_link_attr_channel, |
368 | &mdev_link_attr_comp, |
369 | &mdev_link_attr_comp_params, |
370 | &mdev_link_attr_num_buffers, |
371 | &mdev_link_attr_buffer_size, |
372 | &mdev_link_attr_subbuffer_size, |
373 | &mdev_link_attr_packets_per_xact, |
374 | &mdev_link_attr_datatype, |
375 | &mdev_link_attr_direction, |
376 | &mdev_link_attr_dbr_size, |
377 | NULL, |
378 | }; |
379 | |
380 | static void mdev_link_release(struct config_item *item) |
381 | { |
382 | struct mdev_link *mdev_link = to_mdev_link(item); |
383 | int ret; |
384 | |
385 | if (mdev_link->destroy_link) |
386 | goto free_item; |
387 | |
388 | ret = most_remove_link(mdev: mdev_link->device, mdev_ch: mdev_link->channel, |
389 | comp_name: mdev_link->comp); |
390 | if (ret) { |
391 | pr_err("Removing link failed.\n" ); |
392 | goto free_item; |
393 | } |
394 | |
395 | if (!list_empty(head: &mdev_link_list)) |
396 | list_del(entry: &mdev_link->list); |
397 | |
398 | free_item: |
399 | kfree(objp: to_mdev_link(item)); |
400 | } |
401 | |
402 | static struct configfs_item_operations mdev_link_item_ops = { |
403 | .release = mdev_link_release, |
404 | }; |
405 | |
406 | static const struct config_item_type mdev_link_type = { |
407 | .ct_item_ops = &mdev_link_item_ops, |
408 | .ct_attrs = mdev_link_attrs, |
409 | .ct_owner = THIS_MODULE, |
410 | }; |
411 | |
412 | struct most_common { |
413 | struct config_group group; |
414 | struct module *mod; |
415 | struct configfs_subsystem subsys; |
416 | }; |
417 | |
418 | static struct most_common *to_most_common(struct configfs_subsystem *subsys) |
419 | { |
420 | return container_of(subsys, struct most_common, subsys); |
421 | } |
422 | |
423 | static struct config_item *most_common_make_item(struct config_group *group, |
424 | const char *name) |
425 | { |
426 | struct mdev_link *mdev_link; |
427 | struct most_common *mc = to_most_common(subsys: group->cg_subsys); |
428 | |
429 | mdev_link = kzalloc(size: sizeof(*mdev_link), GFP_KERNEL); |
430 | if (!mdev_link) |
431 | return ERR_PTR(error: -ENOMEM); |
432 | |
433 | if (!try_module_get(module: mc->mod)) { |
434 | kfree(objp: mdev_link); |
435 | return ERR_PTR(error: -ENOLCK); |
436 | } |
437 | config_item_init_type_name(item: &mdev_link->item, name, |
438 | type: &mdev_link_type); |
439 | |
440 | if (!strcmp(group->cg_item.ci_namebuf, "most_cdev" )) |
441 | strcpy(p: mdev_link->comp, q: "cdev" ); |
442 | else if (!strcmp(group->cg_item.ci_namebuf, "most_net" )) |
443 | strcpy(p: mdev_link->comp, q: "net" ); |
444 | else if (!strcmp(group->cg_item.ci_namebuf, "most_video" )) |
445 | strcpy(p: mdev_link->comp, q: "video" ); |
446 | strcpy(p: mdev_link->name, q: name); |
447 | return &mdev_link->item; |
448 | } |
449 | |
450 | static void most_common_release(struct config_item *item) |
451 | { |
452 | struct config_group *group = to_config_group(item); |
453 | |
454 | kfree(objp: to_most_common(subsys: group->cg_subsys)); |
455 | } |
456 | |
457 | static struct configfs_item_operations most_common_item_ops = { |
458 | .release = most_common_release, |
459 | }; |
460 | |
461 | static void most_common_disconnect(struct config_group *group, |
462 | struct config_item *item) |
463 | { |
464 | struct most_common *mc = to_most_common(subsys: group->cg_subsys); |
465 | |
466 | module_put(module: mc->mod); |
467 | } |
468 | |
469 | static struct configfs_group_operations most_common_group_ops = { |
470 | .make_item = most_common_make_item, |
471 | .disconnect_notify = most_common_disconnect, |
472 | }; |
473 | |
474 | static const struct config_item_type most_common_type = { |
475 | .ct_item_ops = &most_common_item_ops, |
476 | .ct_group_ops = &most_common_group_ops, |
477 | .ct_owner = THIS_MODULE, |
478 | }; |
479 | |
480 | static struct most_common most_cdev = { |
481 | .subsys = { |
482 | .su_group = { |
483 | .cg_item = { |
484 | .ci_namebuf = "most_cdev" , |
485 | .ci_type = &most_common_type, |
486 | }, |
487 | }, |
488 | }, |
489 | }; |
490 | |
491 | static struct most_common most_net = { |
492 | .subsys = { |
493 | .su_group = { |
494 | .cg_item = { |
495 | .ci_namebuf = "most_net" , |
496 | .ci_type = &most_common_type, |
497 | }, |
498 | }, |
499 | }, |
500 | }; |
501 | |
502 | static struct most_common most_video = { |
503 | .subsys = { |
504 | .su_group = { |
505 | .cg_item = { |
506 | .ci_namebuf = "most_video" , |
507 | .ci_type = &most_common_type, |
508 | }, |
509 | }, |
510 | }, |
511 | }; |
512 | |
513 | struct most_snd_grp { |
514 | struct config_group group; |
515 | bool create_card; |
516 | struct list_head list; |
517 | }; |
518 | |
519 | static struct most_snd_grp *to_most_snd_grp(struct config_item *item) |
520 | { |
521 | return container_of(to_config_group(item), struct most_snd_grp, group); |
522 | } |
523 | |
524 | static struct config_item *most_snd_grp_make_item(struct config_group *group, |
525 | const char *name) |
526 | { |
527 | struct mdev_link *mdev_link; |
528 | |
529 | mdev_link = kzalloc(size: sizeof(*mdev_link), GFP_KERNEL); |
530 | if (!mdev_link) |
531 | return ERR_PTR(error: -ENOMEM); |
532 | |
533 | config_item_init_type_name(item: &mdev_link->item, name, type: &mdev_link_type); |
534 | mdev_link->create_link = false; |
535 | strcpy(p: mdev_link->name, q: name); |
536 | strcpy(p: mdev_link->comp, q: "sound" ); |
537 | return &mdev_link->item; |
538 | } |
539 | |
540 | static ssize_t most_snd_grp_create_card_store(struct config_item *item, |
541 | const char *page, size_t count) |
542 | { |
543 | struct most_snd_grp *snd_grp = to_most_snd_grp(item); |
544 | int ret; |
545 | bool tmp; |
546 | |
547 | ret = kstrtobool(s: page, res: &tmp); |
548 | if (ret) |
549 | return ret; |
550 | if (tmp) { |
551 | ret = most_cfg_complete(comp_name: "sound" ); |
552 | if (ret) |
553 | return ret; |
554 | } |
555 | snd_grp->create_card = tmp; |
556 | return count; |
557 | } |
558 | |
559 | CONFIGFS_ATTR_WO(most_snd_grp_, create_card); |
560 | |
561 | static struct configfs_attribute *most_snd_grp_attrs[] = { |
562 | &most_snd_grp_attr_create_card, |
563 | NULL, |
564 | }; |
565 | |
566 | static void most_snd_grp_release(struct config_item *item) |
567 | { |
568 | struct most_snd_grp *group = to_most_snd_grp(item); |
569 | |
570 | list_del(entry: &group->list); |
571 | kfree(objp: group); |
572 | } |
573 | |
574 | static struct configfs_item_operations most_snd_grp_item_ops = { |
575 | .release = most_snd_grp_release, |
576 | }; |
577 | |
578 | static struct configfs_group_operations most_snd_grp_group_ops = { |
579 | .make_item = most_snd_grp_make_item, |
580 | }; |
581 | |
582 | static const struct config_item_type most_snd_grp_type = { |
583 | .ct_item_ops = &most_snd_grp_item_ops, |
584 | .ct_group_ops = &most_snd_grp_group_ops, |
585 | .ct_attrs = most_snd_grp_attrs, |
586 | .ct_owner = THIS_MODULE, |
587 | }; |
588 | |
589 | struct most_sound { |
590 | struct configfs_subsystem subsys; |
591 | struct list_head soundcard_list; |
592 | struct module *mod; |
593 | }; |
594 | |
595 | static struct config_group *most_sound_make_group(struct config_group *group, |
596 | const char *name) |
597 | { |
598 | struct most_snd_grp *most; |
599 | struct most_sound *ms = container_of(group->cg_subsys, |
600 | struct most_sound, subsys); |
601 | |
602 | list_for_each_entry(most, &ms->soundcard_list, list) { |
603 | if (!most->create_card) { |
604 | pr_info("adapter configuration still in progress.\n" ); |
605 | return ERR_PTR(error: -EPROTO); |
606 | } |
607 | } |
608 | if (!try_module_get(module: ms->mod)) |
609 | return ERR_PTR(error: -ENOLCK); |
610 | most = kzalloc(size: sizeof(*most), GFP_KERNEL); |
611 | if (!most) { |
612 | module_put(module: ms->mod); |
613 | return ERR_PTR(error: -ENOMEM); |
614 | } |
615 | config_group_init_type_name(group: &most->group, name, type: &most_snd_grp_type); |
616 | list_add_tail(new: &most->list, head: &ms->soundcard_list); |
617 | return &most->group; |
618 | } |
619 | |
620 | static void most_sound_disconnect(struct config_group *group, |
621 | struct config_item *item) |
622 | { |
623 | struct most_sound *ms = container_of(group->cg_subsys, |
624 | struct most_sound, subsys); |
625 | module_put(module: ms->mod); |
626 | } |
627 | |
628 | static struct configfs_group_operations most_sound_group_ops = { |
629 | .make_group = most_sound_make_group, |
630 | .disconnect_notify = most_sound_disconnect, |
631 | }; |
632 | |
633 | static const struct config_item_type most_sound_type = { |
634 | .ct_group_ops = &most_sound_group_ops, |
635 | .ct_owner = THIS_MODULE, |
636 | }; |
637 | |
638 | static struct most_sound most_sound_subsys = { |
639 | .subsys = { |
640 | .su_group = { |
641 | .cg_item = { |
642 | .ci_namebuf = "most_sound" , |
643 | .ci_type = &most_sound_type, |
644 | }, |
645 | }, |
646 | }, |
647 | }; |
648 | |
649 | int most_register_configfs_subsys(struct most_component *c) |
650 | { |
651 | int ret; |
652 | |
653 | if (!strcmp(c->name, "cdev" )) { |
654 | most_cdev.mod = c->mod; |
655 | ret = configfs_register_subsystem(subsys: &most_cdev.subsys); |
656 | } else if (!strcmp(c->name, "net" )) { |
657 | most_net.mod = c->mod; |
658 | ret = configfs_register_subsystem(subsys: &most_net.subsys); |
659 | } else if (!strcmp(c->name, "video" )) { |
660 | most_video.mod = c->mod; |
661 | ret = configfs_register_subsystem(subsys: &most_video.subsys); |
662 | } else if (!strcmp(c->name, "sound" )) { |
663 | most_sound_subsys.mod = c->mod; |
664 | ret = configfs_register_subsystem(subsys: &most_sound_subsys.subsys); |
665 | } else { |
666 | return -ENODEV; |
667 | } |
668 | |
669 | if (ret) { |
670 | pr_err("Error %d while registering subsystem %s\n" , |
671 | ret, c->name); |
672 | } |
673 | return ret; |
674 | } |
675 | EXPORT_SYMBOL_GPL(most_register_configfs_subsys); |
676 | |
677 | void most_interface_register_notify(const char *mdev) |
678 | { |
679 | bool register_snd_card = false; |
680 | struct mdev_link *mdev_link; |
681 | |
682 | list_for_each_entry(mdev_link, &mdev_link_list, list) { |
683 | if (!strcmp(mdev_link->device, mdev)) { |
684 | set_config_and_add_link(mdev_link); |
685 | if (!strcmp(mdev_link->comp, "sound" )) |
686 | register_snd_card = true; |
687 | } |
688 | } |
689 | if (register_snd_card) |
690 | most_cfg_complete(comp_name: "sound" ); |
691 | } |
692 | |
693 | void most_deregister_configfs_subsys(struct most_component *c) |
694 | { |
695 | if (!strcmp(c->name, "cdev" )) |
696 | configfs_unregister_subsystem(subsys: &most_cdev.subsys); |
697 | else if (!strcmp(c->name, "net" )) |
698 | configfs_unregister_subsystem(subsys: &most_net.subsys); |
699 | else if (!strcmp(c->name, "video" )) |
700 | configfs_unregister_subsystem(subsys: &most_video.subsys); |
701 | else if (!strcmp(c->name, "sound" )) |
702 | configfs_unregister_subsystem(subsys: &most_sound_subsys.subsys); |
703 | } |
704 | EXPORT_SYMBOL_GPL(most_deregister_configfs_subsys); |
705 | |
706 | int __init configfs_init(void) |
707 | { |
708 | config_group_init(group: &most_cdev.subsys.su_group); |
709 | mutex_init(&most_cdev.subsys.su_mutex); |
710 | |
711 | config_group_init(group: &most_net.subsys.su_group); |
712 | mutex_init(&most_net.subsys.su_mutex); |
713 | |
714 | config_group_init(group: &most_video.subsys.su_group); |
715 | mutex_init(&most_video.subsys.su_mutex); |
716 | |
717 | config_group_init(group: &most_sound_subsys.subsys.su_group); |
718 | mutex_init(&most_sound_subsys.subsys.su_mutex); |
719 | |
720 | INIT_LIST_HEAD(list: &most_sound_subsys.soundcard_list); |
721 | INIT_LIST_HEAD(list: &mdev_link_list); |
722 | |
723 | return 0; |
724 | } |
725 | |