1/* 2 * phy-core.c -- Generic Phy framework. 3 * 4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com 5 * 6 * Author: Kishon Vijay Abraham I <kishon@ti.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14#include <linux/kernel.h> 15#include <linux/export.h> 16#include <linux/module.h> 17#include <linux/err.h> 18#include <linux/device.h> 19#include <linux/slab.h> 20#include <linux/of.h> 21#include <linux/phy/phy.h> 22#include <linux/idr.h> 23#include <linux/pm_runtime.h> 24#include <linux/regulator/consumer.h> 25 26static struct class *phy_class; 27static DEFINE_MUTEX(phy_provider_mutex); 28static LIST_HEAD(phy_provider_list); 29static LIST_HEAD(phys); 30static DEFINE_IDA(phy_ida); 31 32static void devm_phy_release(struct device *dev, void *res) 33{ 34 struct phy *phy = *(struct phy **)res; 35 36 phy_put(phy); 37} 38 39static void devm_phy_provider_release(struct device *dev, void *res) 40{ 41 struct phy_provider *phy_provider = *(struct phy_provider **)res; 42 43 of_phy_provider_unregister(phy_provider); 44} 45 46static void devm_phy_consume(struct device *dev, void *res) 47{ 48 struct phy *phy = *(struct phy **)res; 49 50 phy_destroy(phy); 51} 52 53static int devm_phy_match(struct device *dev, void *res, void *match_data) 54{ 55 struct phy **phy = res; 56 57 return *phy == match_data; 58} 59 60/** 61 * phy_create_lookup() - allocate and register PHY/device association 62 * @phy: the phy of the association 63 * @con_id: connection ID string on device 64 * @dev_id: the device of the association 65 * 66 * Creates and registers phy_lookup entry. 67 */ 68int phy_create_lookup(struct phy *phy, const char *con_id, const char *dev_id) 69{ 70 struct phy_lookup *pl; 71 72 if (!phy || !dev_id || !con_id) 73 return -EINVAL; 74 75 pl = kzalloc(sizeof(*pl), GFP_KERNEL); 76 if (!pl) 77 return -ENOMEM; 78 79 pl->dev_id = dev_id; 80 pl->con_id = con_id; 81 pl->phy = phy; 82 83 mutex_lock(&phy_provider_mutex); 84 list_add_tail(&pl->node, &phys); 85 mutex_unlock(&phy_provider_mutex); 86 87 return 0; 88} 89EXPORT_SYMBOL_GPL(phy_create_lookup); 90 91/** 92 * phy_remove_lookup() - find and remove PHY/device association 93 * @phy: the phy of the association 94 * @con_id: connection ID string on device 95 * @dev_id: the device of the association 96 * 97 * Finds and unregisters phy_lookup entry that was created with 98 * phy_create_lookup(). 99 */ 100void phy_remove_lookup(struct phy *phy, const char *con_id, const char *dev_id) 101{ 102 struct phy_lookup *pl; 103 104 if (!phy || !dev_id || !con_id) 105 return; 106 107 mutex_lock(&phy_provider_mutex); 108 list_for_each_entry(pl, &phys, node) 109 if (pl->phy == phy && !strcmp(pl->dev_id, dev_id) && 110 !strcmp(pl->con_id, con_id)) { 111 list_del(&pl->node); 112 kfree(pl); 113 break; 114 } 115 mutex_unlock(&phy_provider_mutex); 116} 117EXPORT_SYMBOL_GPL(phy_remove_lookup); 118 119static struct phy *phy_find(struct device *dev, const char *con_id) 120{ 121 const char *dev_id = dev_name(dev); 122 struct phy_lookup *p, *pl = NULL; 123 124 mutex_lock(&phy_provider_mutex); 125 list_for_each_entry(p, &phys, node) 126 if (!strcmp(p->dev_id, dev_id) && !strcmp(p->con_id, con_id)) { 127 pl = p; 128 break; 129 } 130 mutex_unlock(&phy_provider_mutex); 131 132 return pl ? pl->phy : ERR_PTR(-ENODEV); 133} 134 135static struct phy_provider *of_phy_provider_lookup(struct device_node *node) 136{ 137 struct phy_provider *phy_provider; 138 struct device_node *child; 139 140 list_for_each_entry(phy_provider, &phy_provider_list, list) { 141 if (phy_provider->dev->of_node == node) 142 return phy_provider; 143 144 for_each_child_of_node(phy_provider->dev->of_node, child) 145 if (child == node) 146 return phy_provider; 147 } 148 149 return ERR_PTR(-EPROBE_DEFER); 150} 151 152int phy_pm_runtime_get(struct phy *phy) 153{ 154 int ret; 155 156 if (!pm_runtime_enabled(&phy->dev)) 157 return -ENOTSUPP; 158 159 ret = pm_runtime_get(&phy->dev); 160 if (ret < 0 && ret != -EINPROGRESS) 161 pm_runtime_put_noidle(&phy->dev); 162 163 return ret; 164} 165EXPORT_SYMBOL_GPL(phy_pm_runtime_get); 166 167int phy_pm_runtime_get_sync(struct phy *phy) 168{ 169 int ret; 170 171 if (!pm_runtime_enabled(&phy->dev)) 172 return -ENOTSUPP; 173 174 ret = pm_runtime_get_sync(&phy->dev); 175 if (ret < 0) 176 pm_runtime_put_sync(&phy->dev); 177 178 return ret; 179} 180EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync); 181 182int phy_pm_runtime_put(struct phy *phy) 183{ 184 if (!pm_runtime_enabled(&phy->dev)) 185 return -ENOTSUPP; 186 187 return pm_runtime_put(&phy->dev); 188} 189EXPORT_SYMBOL_GPL(phy_pm_runtime_put); 190 191int phy_pm_runtime_put_sync(struct phy *phy) 192{ 193 if (!pm_runtime_enabled(&phy->dev)) 194 return -ENOTSUPP; 195 196 return pm_runtime_put_sync(&phy->dev); 197} 198EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync); 199 200void phy_pm_runtime_allow(struct phy *phy) 201{ 202 if (!pm_runtime_enabled(&phy->dev)) 203 return; 204 205 pm_runtime_allow(&phy->dev); 206} 207EXPORT_SYMBOL_GPL(phy_pm_runtime_allow); 208 209void phy_pm_runtime_forbid(struct phy *phy) 210{ 211 if (!pm_runtime_enabled(&phy->dev)) 212 return; 213 214 pm_runtime_forbid(&phy->dev); 215} 216EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid); 217 218int phy_init(struct phy *phy) 219{ 220 int ret; 221 222 if (!phy) 223 return 0; 224 225 ret = phy_pm_runtime_get_sync(phy); 226 if (ret < 0 && ret != -ENOTSUPP) 227 return ret; 228 ret = 0; /* Override possible ret == -ENOTSUPP */ 229 230 mutex_lock(&phy->mutex); 231 if (phy->init_count == 0 && phy->ops->init) { 232 ret = phy->ops->init(phy); 233 if (ret < 0) { 234 dev_err(&phy->dev, "phy init failed --> %d\n", ret); 235 goto out; 236 } 237 } 238 ++phy->init_count; 239 240out: 241 mutex_unlock(&phy->mutex); 242 phy_pm_runtime_put(phy); 243 return ret; 244} 245EXPORT_SYMBOL_GPL(phy_init); 246 247int phy_exit(struct phy *phy) 248{ 249 int ret; 250 251 if (!phy) 252 return 0; 253 254 ret = phy_pm_runtime_get_sync(phy); 255 if (ret < 0 && ret != -ENOTSUPP) 256 return ret; 257 ret = 0; /* Override possible ret == -ENOTSUPP */ 258 259 mutex_lock(&phy->mutex); 260 if (phy->init_count == 1 && phy->ops->exit) { 261 ret = phy->ops->exit(phy); 262 if (ret < 0) { 263 dev_err(&phy->dev, "phy exit failed --> %d\n", ret); 264 goto out; 265 } 266 } 267 --phy->init_count; 268 269out: 270 mutex_unlock(&phy->mutex); 271 phy_pm_runtime_put(phy); 272 return ret; 273} 274EXPORT_SYMBOL_GPL(phy_exit); 275 276int phy_power_on(struct phy *phy) 277{ 278 int ret = 0; 279 280 if (!phy) 281 goto out; 282 283 if (phy->pwr) { 284 ret = regulator_enable(phy->pwr); 285 if (ret) 286 goto out; 287 } 288 289 ret = phy_pm_runtime_get_sync(phy); 290 if (ret < 0 && ret != -ENOTSUPP) 291 goto err_pm_sync; 292 293 ret = 0; /* Override possible ret == -ENOTSUPP */ 294 295 mutex_lock(&phy->mutex); 296 if (phy->power_count == 0 && phy->ops->power_on) { 297 ret = phy->ops->power_on(phy); 298 if (ret < 0) { 299 dev_err(&phy->dev, "phy poweron failed --> %d\n", ret); 300 goto err_pwr_on; 301 } 302 } 303 ++phy->power_count; 304 mutex_unlock(&phy->mutex); 305 return 0; 306 307err_pwr_on: 308 mutex_unlock(&phy->mutex); 309 phy_pm_runtime_put_sync(phy); 310err_pm_sync: 311 if (phy->pwr) 312 regulator_disable(phy->pwr); 313out: 314 return ret; 315} 316EXPORT_SYMBOL_GPL(phy_power_on); 317 318int phy_power_off(struct phy *phy) 319{ 320 int ret; 321 322 if (!phy) 323 return 0; 324 325 mutex_lock(&phy->mutex); 326 if (phy->power_count == 1 && phy->ops->power_off) { 327 ret = phy->ops->power_off(phy); 328 if (ret < 0) { 329 dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret); 330 mutex_unlock(&phy->mutex); 331 return ret; 332 } 333 } 334 --phy->power_count; 335 mutex_unlock(&phy->mutex); 336 phy_pm_runtime_put(phy); 337 338 if (phy->pwr) 339 regulator_disable(phy->pwr); 340 341 return 0; 342} 343EXPORT_SYMBOL_GPL(phy_power_off); 344 345/** 346 * _of_phy_get() - lookup and obtain a reference to a phy by phandle 347 * @np: device_node for which to get the phy 348 * @index: the index of the phy 349 * 350 * Returns the phy associated with the given phandle value, 351 * after getting a refcount to it or -ENODEV if there is no such phy or 352 * -EPROBE_DEFER if there is a phandle to the phy, but the device is 353 * not yet loaded. This function uses of_xlate call back function provided 354 * while registering the phy_provider to find the phy instance. 355 */ 356static struct phy *_of_phy_get(struct device_node *np, int index) 357{ 358 int ret; 359 struct phy_provider *phy_provider; 360 struct phy *phy = NULL; 361 struct of_phandle_args args; 362 363 ret = of_parse_phandle_with_args(np, "phys", "#phy-cells", 364 index, &args); 365 if (ret) 366 return ERR_PTR(-ENODEV); 367 368 mutex_lock(&phy_provider_mutex); 369 phy_provider = of_phy_provider_lookup(args.np); 370 if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) { 371 phy = ERR_PTR(-EPROBE_DEFER); 372 goto err0; 373 } 374 375 phy = phy_provider->of_xlate(phy_provider->dev, &args); 376 module_put(phy_provider->owner); 377 378err0: 379 mutex_unlock(&phy_provider_mutex); 380 of_node_put(args.np); 381 382 return phy; 383} 384 385/** 386 * of_phy_get() - lookup and obtain a reference to a phy using a device_node. 387 * @np: device_node for which to get the phy 388 * @con_id: name of the phy from device's point of view 389 * 390 * Returns the phy driver, after getting a refcount to it; or 391 * -ENODEV if there is no such phy. The caller is responsible for 392 * calling phy_put() to release that count. 393 */ 394struct phy *of_phy_get(struct device_node *np, const char *con_id) 395{ 396 struct phy *phy = NULL; 397 int index = 0; 398 399 if (con_id) 400 index = of_property_match_string(np, "phy-names", con_id); 401 402 phy = _of_phy_get(np, index); 403 if (IS_ERR(phy)) 404 return phy; 405 406 if (!try_module_get(phy->ops->owner)) 407 return ERR_PTR(-EPROBE_DEFER); 408 409 get_device(&phy->dev); 410 411 return phy; 412} 413EXPORT_SYMBOL_GPL(of_phy_get); 414 415/** 416 * phy_put() - release the PHY 417 * @phy: the phy returned by phy_get() 418 * 419 * Releases a refcount the caller received from phy_get(). 420 */ 421void phy_put(struct phy *phy) 422{ 423 if (!phy || IS_ERR(phy)) 424 return; 425 426 module_put(phy->ops->owner); 427 put_device(&phy->dev); 428} 429EXPORT_SYMBOL_GPL(phy_put); 430 431/** 432 * devm_phy_put() - release the PHY 433 * @dev: device that wants to release this phy 434 * @phy: the phy returned by devm_phy_get() 435 * 436 * destroys the devres associated with this phy and invokes phy_put 437 * to release the phy. 438 */ 439void devm_phy_put(struct device *dev, struct phy *phy) 440{ 441 int r; 442 443 if (!phy) 444 return; 445 446 r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy); 447 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); 448} 449EXPORT_SYMBOL_GPL(devm_phy_put); 450 451/** 452 * of_phy_simple_xlate() - returns the phy instance from phy provider 453 * @dev: the PHY provider device 454 * @args: of_phandle_args (not used here) 455 * 456 * Intended to be used by phy provider for the common case where #phy-cells is 457 * 0. For other cases where #phy-cells is greater than '0', the phy provider 458 * should provide a custom of_xlate function that reads the *args* and returns 459 * the appropriate phy. 460 */ 461struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args 462 *args) 463{ 464 struct phy *phy; 465 struct class_dev_iter iter; 466 467 class_dev_iter_init(&iter, phy_class, NULL, NULL); 468 while ((dev = class_dev_iter_next(&iter))) { 469 phy = to_phy(dev); 470 if (args->np != phy->dev.of_node) 471 continue; 472 473 class_dev_iter_exit(&iter); 474 return phy; 475 } 476 477 class_dev_iter_exit(&iter); 478 return ERR_PTR(-ENODEV); 479} 480EXPORT_SYMBOL_GPL(of_phy_simple_xlate); 481 482/** 483 * phy_get() - lookup and obtain a reference to a phy. 484 * @dev: device that requests this phy 485 * @string: the phy name as given in the dt data or the name of the controller 486 * port for non-dt case 487 * 488 * Returns the phy driver, after getting a refcount to it; or 489 * -ENODEV if there is no such phy. The caller is responsible for 490 * calling phy_put() to release that count. 491 */ 492struct phy *phy_get(struct device *dev, const char *string) 493{ 494 int index = 0; 495 struct phy *phy; 496 497 if (string == NULL) { 498 dev_WARN(dev, "missing string\n"); 499 return ERR_PTR(-EINVAL); 500 } 501 502 if (dev->of_node) { 503 index = of_property_match_string(dev->of_node, "phy-names", 504 string); 505 phy = _of_phy_get(dev->of_node, index); 506 } else { 507 phy = phy_find(dev, string); 508 } 509 if (IS_ERR(phy)) 510 return phy; 511 512 if (!try_module_get(phy->ops->owner)) 513 return ERR_PTR(-EPROBE_DEFER); 514 515 get_device(&phy->dev); 516 517 return phy; 518} 519EXPORT_SYMBOL_GPL(phy_get); 520 521/** 522 * phy_optional_get() - lookup and obtain a reference to an optional phy. 523 * @dev: device that requests this phy 524 * @string: the phy name as given in the dt data or the name of the controller 525 * port for non-dt case 526 * 527 * Returns the phy driver, after getting a refcount to it; or 528 * NULL if there is no such phy. The caller is responsible for 529 * calling phy_put() to release that count. 530 */ 531struct phy *phy_optional_get(struct device *dev, const char *string) 532{ 533 struct phy *phy = phy_get(dev, string); 534 535 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV)) 536 phy = NULL; 537 538 return phy; 539} 540EXPORT_SYMBOL_GPL(phy_optional_get); 541 542/** 543 * devm_phy_get() - lookup and obtain a reference to a phy. 544 * @dev: device that requests this phy 545 * @string: the phy name as given in the dt data or phy device name 546 * for non-dt case 547 * 548 * Gets the phy using phy_get(), and associates a device with it using 549 * devres. On driver detach, release function is invoked on the devres data, 550 * then, devres data is freed. 551 */ 552struct phy *devm_phy_get(struct device *dev, const char *string) 553{ 554 struct phy **ptr, *phy; 555 556 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL); 557 if (!ptr) 558 return ERR_PTR(-ENOMEM); 559 560 phy = phy_get(dev, string); 561 if (!IS_ERR(phy)) { 562 *ptr = phy; 563 devres_add(dev, ptr); 564 } else { 565 devres_free(ptr); 566 } 567 568 return phy; 569} 570EXPORT_SYMBOL_GPL(devm_phy_get); 571 572/** 573 * devm_phy_optional_get() - lookup and obtain a reference to an optional phy. 574 * @dev: device that requests this phy 575 * @string: the phy name as given in the dt data or phy device name 576 * for non-dt case 577 * 578 * Gets the phy using phy_get(), and associates a device with it using 579 * devres. On driver detach, release function is invoked on the devres 580 * data, then, devres data is freed. This differs to devm_phy_get() in 581 * that if the phy does not exist, it is not considered an error and 582 * -ENODEV will not be returned. Instead the NULL phy is returned, 583 * which can be passed to all other phy consumer calls. 584 */ 585struct phy *devm_phy_optional_get(struct device *dev, const char *string) 586{ 587 struct phy *phy = devm_phy_get(dev, string); 588 589 if (IS_ERR(phy) && (PTR_ERR(phy) == -ENODEV)) 590 phy = NULL; 591 592 return phy; 593} 594EXPORT_SYMBOL_GPL(devm_phy_optional_get); 595 596/** 597 * devm_of_phy_get() - lookup and obtain a reference to a phy. 598 * @dev: device that requests this phy 599 * @np: node containing the phy 600 * @con_id: name of the phy from device's point of view 601 * 602 * Gets the phy using of_phy_get(), and associates a device with it using 603 * devres. On driver detach, release function is invoked on the devres data, 604 * then, devres data is freed. 605 */ 606struct phy *devm_of_phy_get(struct device *dev, struct device_node *np, 607 const char *con_id) 608{ 609 struct phy **ptr, *phy; 610 611 ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL); 612 if (!ptr) 613 return ERR_PTR(-ENOMEM); 614 615 phy = of_phy_get(np, con_id); 616 if (!IS_ERR(phy)) { 617 *ptr = phy; 618 devres_add(dev, ptr); 619 } else { 620 devres_free(ptr); 621 } 622 623 return phy; 624} 625EXPORT_SYMBOL_GPL(devm_of_phy_get); 626 627/** 628 * phy_create() - create a new phy 629 * @dev: device that is creating the new phy 630 * @node: device node of the phy 631 * @ops: function pointers for performing phy operations 632 * 633 * Called to create a phy using phy framework. 634 */ 635struct phy *phy_create(struct device *dev, struct device_node *node, 636 const struct phy_ops *ops) 637{ 638 int ret; 639 int id; 640 struct phy *phy; 641 642 if (WARN_ON(!dev)) 643 return ERR_PTR(-EINVAL); 644 645 phy = kzalloc(sizeof(*phy), GFP_KERNEL); 646 if (!phy) 647 return ERR_PTR(-ENOMEM); 648 649 id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL); 650 if (id < 0) { 651 dev_err(dev, "unable to get id\n"); 652 ret = id; 653 goto free_phy; 654 } 655 656 /* phy-supply */ 657 phy->pwr = regulator_get_optional(dev, "phy"); 658 if (IS_ERR(phy->pwr)) { 659 if (PTR_ERR(phy->pwr) == -EPROBE_DEFER) { 660 ret = -EPROBE_DEFER; 661 goto free_ida; 662 } 663 phy->pwr = NULL; 664 } 665 666 device_initialize(&phy->dev); 667 mutex_init(&phy->mutex); 668 669 phy->dev.class = phy_class; 670 phy->dev.parent = dev; 671 phy->dev.of_node = node ?: dev->of_node; 672 phy->id = id; 673 phy->ops = ops; 674 675 ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id); 676 if (ret) 677 goto put_dev; 678 679 ret = device_add(&phy->dev); 680 if (ret) 681 goto put_dev; 682 683 if (pm_runtime_enabled(dev)) { 684 pm_runtime_enable(&phy->dev); 685 pm_runtime_no_callbacks(&phy->dev); 686 } 687 688 return phy; 689 690put_dev: 691 put_device(&phy->dev); /* calls phy_release() which frees resources */ 692 return ERR_PTR(ret); 693 694free_ida: 695 ida_simple_remove(&phy_ida, phy->id); 696 697free_phy: 698 kfree(phy); 699 return ERR_PTR(ret); 700} 701EXPORT_SYMBOL_GPL(phy_create); 702 703/** 704 * devm_phy_create() - create a new phy 705 * @dev: device that is creating the new phy 706 * @node: device node of the phy 707 * @ops: function pointers for performing phy operations 708 * 709 * Creates a new PHY device adding it to the PHY class. 710 * While at that, it also associates the device with the phy using devres. 711 * On driver detach, release function is invoked on the devres data, 712 * then, devres data is freed. 713 */ 714struct phy *devm_phy_create(struct device *dev, struct device_node *node, 715 const struct phy_ops *ops) 716{ 717 struct phy **ptr, *phy; 718 719 ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL); 720 if (!ptr) 721 return ERR_PTR(-ENOMEM); 722 723 phy = phy_create(dev, node, ops); 724 if (!IS_ERR(phy)) { 725 *ptr = phy; 726 devres_add(dev, ptr); 727 } else { 728 devres_free(ptr); 729 } 730 731 return phy; 732} 733EXPORT_SYMBOL_GPL(devm_phy_create); 734 735/** 736 * phy_destroy() - destroy the phy 737 * @phy: the phy to be destroyed 738 * 739 * Called to destroy the phy. 740 */ 741void phy_destroy(struct phy *phy) 742{ 743 pm_runtime_disable(&phy->dev); 744 device_unregister(&phy->dev); 745} 746EXPORT_SYMBOL_GPL(phy_destroy); 747 748/** 749 * devm_phy_destroy() - destroy the PHY 750 * @dev: device that wants to release this phy 751 * @phy: the phy returned by devm_phy_get() 752 * 753 * destroys the devres associated with this phy and invokes phy_destroy 754 * to destroy the phy. 755 */ 756void devm_phy_destroy(struct device *dev, struct phy *phy) 757{ 758 int r; 759 760 r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy); 761 dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); 762} 763EXPORT_SYMBOL_GPL(devm_phy_destroy); 764 765/** 766 * __of_phy_provider_register() - create/register phy provider with the framework 767 * @dev: struct device of the phy provider 768 * @owner: the module owner containing of_xlate 769 * @of_xlate: function pointer to obtain phy instance from phy provider 770 * 771 * Creates struct phy_provider from dev and of_xlate function pointer. 772 * This is used in the case of dt boot for finding the phy instance from 773 * phy provider. 774 */ 775struct phy_provider *__of_phy_provider_register(struct device *dev, 776 struct module *owner, struct phy * (*of_xlate)(struct device *dev, 777 struct of_phandle_args *args)) 778{ 779 struct phy_provider *phy_provider; 780 781 phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL); 782 if (!phy_provider) 783 return ERR_PTR(-ENOMEM); 784 785 phy_provider->dev = dev; 786 phy_provider->owner = owner; 787 phy_provider->of_xlate = of_xlate; 788 789 mutex_lock(&phy_provider_mutex); 790 list_add_tail(&phy_provider->list, &phy_provider_list); 791 mutex_unlock(&phy_provider_mutex); 792 793 return phy_provider; 794} 795EXPORT_SYMBOL_GPL(__of_phy_provider_register); 796 797/** 798 * __devm_of_phy_provider_register() - create/register phy provider with the 799 * framework 800 * @dev: struct device of the phy provider 801 * @owner: the module owner containing of_xlate 802 * @of_xlate: function pointer to obtain phy instance from phy provider 803 * 804 * Creates struct phy_provider from dev and of_xlate function pointer. 805 * This is used in the case of dt boot for finding the phy instance from 806 * phy provider. While at that, it also associates the device with the 807 * phy provider using devres. On driver detach, release function is invoked 808 * on the devres data, then, devres data is freed. 809 */ 810struct phy_provider *__devm_of_phy_provider_register(struct device *dev, 811 struct module *owner, struct phy * (*of_xlate)(struct device *dev, 812 struct of_phandle_args *args)) 813{ 814 struct phy_provider **ptr, *phy_provider; 815 816 ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL); 817 if (!ptr) 818 return ERR_PTR(-ENOMEM); 819 820 phy_provider = __of_phy_provider_register(dev, owner, of_xlate); 821 if (!IS_ERR(phy_provider)) { 822 *ptr = phy_provider; 823 devres_add(dev, ptr); 824 } else { 825 devres_free(ptr); 826 } 827 828 return phy_provider; 829} 830EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register); 831 832/** 833 * of_phy_provider_unregister() - unregister phy provider from the framework 834 * @phy_provider: phy provider returned by of_phy_provider_register() 835 * 836 * Removes the phy_provider created using of_phy_provider_register(). 837 */ 838void of_phy_provider_unregister(struct phy_provider *phy_provider) 839{ 840 if (IS_ERR(phy_provider)) 841 return; 842 843 mutex_lock(&phy_provider_mutex); 844 list_del(&phy_provider->list); 845 kfree(phy_provider); 846 mutex_unlock(&phy_provider_mutex); 847} 848EXPORT_SYMBOL_GPL(of_phy_provider_unregister); 849 850/** 851 * devm_of_phy_provider_unregister() - remove phy provider from the framework 852 * @dev: struct device of the phy provider 853 * 854 * destroys the devres associated with this phy provider and invokes 855 * of_phy_provider_unregister to unregister the phy provider. 856 */ 857void devm_of_phy_provider_unregister(struct device *dev, 858 struct phy_provider *phy_provider) { 859 int r; 860 861 r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match, 862 phy_provider); 863 dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n"); 864} 865EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister); 866 867/** 868 * phy_release() - release the phy 869 * @dev: the dev member within phy 870 * 871 * When the last reference to the device is removed, it is called 872 * from the embedded kobject as release method. 873 */ 874static void phy_release(struct device *dev) 875{ 876 struct phy *phy; 877 878 phy = to_phy(dev); 879 dev_vdbg(dev, "releasing '%s'\n", dev_name(dev)); 880 regulator_put(phy->pwr); 881 ida_simple_remove(&phy_ida, phy->id); 882 kfree(phy); 883} 884 885static int __init phy_core_init(void) 886{ 887 phy_class = class_create(THIS_MODULE, "phy"); 888 if (IS_ERR(phy_class)) { 889 pr_err("failed to create phy class --> %ld\n", 890 PTR_ERR(phy_class)); 891 return PTR_ERR(phy_class); 892 } 893 894 phy_class->dev_release = phy_release; 895 896 return 0; 897} 898module_init(phy_core_init); 899 900static void __exit phy_core_exit(void) 901{ 902 class_destroy(phy_class); 903} 904module_exit(phy_core_exit); 905 906MODULE_DESCRIPTION("Generic PHY Framework"); 907MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>"); 908MODULE_LICENSE("GPL v2"); 909