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