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(link->device, link->channel, 41 link->buffer_size); 42 } 43 44 static int set_cfg_subbuffer_size(struct mdev_link *link) 45 { 46 return most_set_cfg_subbuffer_size(link->device, link->channel, 47 link->subbuffer_size); 48 } 49 50 static int set_cfg_dbr_size(struct mdev_link *link) 51 { 52 return most_set_cfg_dbr_size(link->device, link->channel, 53 link->dbr_size); 54 } 55 56 static int set_cfg_num_buffers(struct mdev_link *link) 57 { 58 return most_set_cfg_num_buffers(link->device, link->channel, 59 link->num_buffers); 60 } 61 62 static int set_cfg_packets_xact(struct mdev_link *link) 63 { 64 return most_set_cfg_packets_xact(link->device, link->channel, 65 link->packets_per_xact); 66 } 67 68 static int set_cfg_direction(struct mdev_link *link) 69 { 70 return most_set_cfg_direction(link->device, link->channel, 71 link->direction); 72 } 73 74 static int set_cfg_datatype(struct mdev_link *link) 75 { 76 return most_set_cfg_datatype(link->device, link->channel, 77 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_link->device, mdev_link->channel, 109 mdev_link->comp, mdev_link->name, 110 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(page, &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(&mdev_link->list, &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(page, &tmp); 143 if (ret) 144 return ret; 145 if (!tmp) 146 return count; 147 148 ret = most_remove_link(mdev_link->device, mdev_link->channel, 149 mdev_link->comp); 150 if (ret) 151 return ret; 152 if (!list_empty(&mdev_link_list)) 153 list_del(&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(page, PAGE_SIZE, "%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(page, "dir_rx") && !sysfs_streq(page, "rx") && 171 !sysfs_streq(page, "dir_tx") && !sysfs_streq(page, "tx")) 172 return -EINVAL; 173 strcpy(mdev_link->direction, 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(page, PAGE_SIZE, "%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(page, "control") && !sysfs_streq(page, "async") && 189 !sysfs_streq(page, "sync") && !sysfs_streq(page, "isoc") && 190 !sysfs_streq(page, "isoc_avp")) 191 return -EINVAL; 192 strcpy(mdev_link->datatype, 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(page, PAGE_SIZE, "%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 strlcpy(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(page, PAGE_SIZE, "%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 strlcpy(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(page, PAGE_SIZE, "%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 strlcpy(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(page, PAGE_SIZE, "%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 strlcpy(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(page, PAGE_SIZE, "%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(page, 0, &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(page, PAGE_SIZE, "%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(page, 0, &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(page, PAGE_SIZE, "%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(page, 0, &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(page, PAGE_SIZE, "%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(page, 0, &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(page, PAGE_SIZE, "%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(page, 0, &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_link->device, mdev_link->channel, 389 mdev_link->comp); 390 if (ret) { 391 pr_err("Removing link failed.\n"); 392 goto free_item; 393 } 394 395 if (!list_empty(&mdev_link_list)) 396 list_del(&mdev_link->list); 397 398 free_item: 399 kfree(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(group->cg_subsys); 428 429 mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL); 430 if (!mdev_link) 431 return ERR_PTR(-ENOMEM); 432 433 if (!try_module_get(mc->mod)) { 434 kfree(mdev_link); 435 return ERR_PTR(-ENOLCK); 436 } 437 config_item_init_type_name(&mdev_link->item, name, 438 &mdev_link_type); 439 440 if (!strcmp(group->cg_item.ci_namebuf, "most_cdev")) 441 strcpy(mdev_link->comp, "cdev"); 442 else if (!strcmp(group->cg_item.ci_namebuf, "most_net")) 443 strcpy(mdev_link->comp, "net"); 444 else if (!strcmp(group->cg_item.ci_namebuf, "most_video")) 445 strcpy(mdev_link->comp, "video"); 446 strcpy(mdev_link->name, 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(to_most_common(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(group->cg_subsys); 465 466 module_put(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(sizeof(*mdev_link), GFP_KERNEL); 530 if (!mdev_link) 531 return ERR_PTR(-ENOMEM); 532 533 config_item_init_type_name(&mdev_link->item, name, &mdev_link_type); 534 mdev_link->create_link = false; 535 strcpy(mdev_link->name, name); 536 strcpy(mdev_link->comp, "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(page, &tmp); 548 if (ret) 549 return ret; 550 if (tmp) { 551 ret = most_cfg_complete("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(&group->list); 571 kfree(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(-EPROTO); 606 } 607 } 608 if (!try_module_get(ms->mod)) 609 return ERR_PTR(-ENOLCK); 610 most = kzalloc(sizeof(*most), GFP_KERNEL); 611 if (!most) { 612 module_put(ms->mod); 613 return ERR_PTR(-ENOMEM); 614 } 615 config_group_init_type_name(&most->group, name, &most_snd_grp_type); 616 list_add_tail(&most->list, &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(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(&most_cdev.subsys); 656 } else if (!strcmp(c->name, "net")) { 657 most_net.mod = c->mod; 658 ret = configfs_register_subsystem(&most_net.subsys); 659 } else if (!strcmp(c->name, "video")) { 660 most_video.mod = c->mod; 661 ret = configfs_register_subsystem(&most_video.subsys); 662 } else if (!strcmp(c->name, "sound")) { 663 most_sound_subsys.mod = c->mod; 664 ret = configfs_register_subsystem(&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("sound"); 691 } 692 693 void most_deregister_configfs_subsys(struct most_component *c) 694 { 695 if (!strcmp(c->name, "cdev")) 696 configfs_unregister_subsystem(&most_cdev.subsys); 697 else if (!strcmp(c->name, "net")) 698 configfs_unregister_subsystem(&most_net.subsys); 699 else if (!strcmp(c->name, "video")) 700 configfs_unregister_subsystem(&most_video.subsys); 701 else if (!strcmp(c->name, "sound")) 702 configfs_unregister_subsystem(&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(&most_cdev.subsys.su_group); 709 mutex_init(&most_cdev.subsys.su_mutex); 710 711 config_group_init(&most_net.subsys.su_group); 712 mutex_init(&most_net.subsys.su_mutex); 713 714 config_group_init(&most_video.subsys.su_group); 715 mutex_init(&most_video.subsys.su_mutex); 716 717 config_group_init(&most_sound_subsys.subsys.su_group); 718 mutex_init(&most_sound_subsys.subsys.su_mutex); 719 720 INIT_LIST_HEAD(&most_sound_subsys.soundcard_list); 721 INIT_LIST_HEAD(&mdev_link_list); 722 723 return 0; 724 } 725