Kishon Vijay Abraham I | ff76496 | 2013-09-27 11:53:25 +0530 | [diff] [blame] | 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 | |
| 25 | static struct class *phy_class; |
| 26 | static DEFINE_MUTEX(phy_provider_mutex); |
| 27 | static LIST_HEAD(phy_provider_list); |
| 28 | static DEFINE_IDA(phy_ida); |
| 29 | |
| 30 | static void devm_phy_release(struct device *dev, void *res) |
| 31 | { |
| 32 | struct phy *phy = *(struct phy **)res; |
| 33 | |
| 34 | phy_put(phy); |
| 35 | } |
| 36 | |
| 37 | static void devm_phy_provider_release(struct device *dev, void *res) |
| 38 | { |
| 39 | struct phy_provider *phy_provider = *(struct phy_provider **)res; |
| 40 | |
| 41 | of_phy_provider_unregister(phy_provider); |
| 42 | } |
| 43 | |
| 44 | static void devm_phy_consume(struct device *dev, void *res) |
| 45 | { |
| 46 | struct phy *phy = *(struct phy **)res; |
| 47 | |
| 48 | phy_destroy(phy); |
| 49 | } |
| 50 | |
| 51 | static int devm_phy_match(struct device *dev, void *res, void *match_data) |
| 52 | { |
| 53 | return res == match_data; |
| 54 | } |
| 55 | |
| 56 | static struct phy *phy_lookup(struct device *device, const char *port) |
| 57 | { |
| 58 | unsigned int count; |
| 59 | struct phy *phy; |
| 60 | struct device *dev; |
| 61 | struct phy_consumer *consumers; |
| 62 | struct class_dev_iter iter; |
| 63 | |
| 64 | class_dev_iter_init(&iter, phy_class, NULL, NULL); |
| 65 | while ((dev = class_dev_iter_next(&iter))) { |
| 66 | phy = to_phy(dev); |
| 67 | count = phy->init_data->num_consumers; |
| 68 | consumers = phy->init_data->consumers; |
| 69 | while (count--) { |
| 70 | if (!strcmp(consumers->dev_name, dev_name(device)) && |
| 71 | !strcmp(consumers->port, port)) { |
| 72 | class_dev_iter_exit(&iter); |
| 73 | return phy; |
| 74 | } |
| 75 | consumers++; |
| 76 | } |
| 77 | } |
| 78 | |
| 79 | class_dev_iter_exit(&iter); |
| 80 | return ERR_PTR(-ENODEV); |
| 81 | } |
| 82 | |
| 83 | static struct phy_provider *of_phy_provider_lookup(struct device_node *node) |
| 84 | { |
| 85 | struct phy_provider *phy_provider; |
| 86 | |
| 87 | list_for_each_entry(phy_provider, &phy_provider_list, list) { |
| 88 | if (phy_provider->dev->of_node == node) |
| 89 | return phy_provider; |
| 90 | } |
| 91 | |
| 92 | return ERR_PTR(-EPROBE_DEFER); |
| 93 | } |
| 94 | |
| 95 | int phy_pm_runtime_get(struct phy *phy) |
| 96 | { |
| 97 | if (!pm_runtime_enabled(&phy->dev)) |
| 98 | return -ENOTSUPP; |
| 99 | |
| 100 | return pm_runtime_get(&phy->dev); |
| 101 | } |
| 102 | EXPORT_SYMBOL_GPL(phy_pm_runtime_get); |
| 103 | |
| 104 | int phy_pm_runtime_get_sync(struct phy *phy) |
| 105 | { |
| 106 | if (!pm_runtime_enabled(&phy->dev)) |
| 107 | return -ENOTSUPP; |
| 108 | |
| 109 | return pm_runtime_get_sync(&phy->dev); |
| 110 | } |
| 111 | EXPORT_SYMBOL_GPL(phy_pm_runtime_get_sync); |
| 112 | |
| 113 | int phy_pm_runtime_put(struct phy *phy) |
| 114 | { |
| 115 | if (!pm_runtime_enabled(&phy->dev)) |
| 116 | return -ENOTSUPP; |
| 117 | |
| 118 | return pm_runtime_put(&phy->dev); |
| 119 | } |
| 120 | EXPORT_SYMBOL_GPL(phy_pm_runtime_put); |
| 121 | |
| 122 | int phy_pm_runtime_put_sync(struct phy *phy) |
| 123 | { |
| 124 | if (!pm_runtime_enabled(&phy->dev)) |
| 125 | return -ENOTSUPP; |
| 126 | |
| 127 | return pm_runtime_put_sync(&phy->dev); |
| 128 | } |
| 129 | EXPORT_SYMBOL_GPL(phy_pm_runtime_put_sync); |
| 130 | |
| 131 | void phy_pm_runtime_allow(struct phy *phy) |
| 132 | { |
| 133 | if (!pm_runtime_enabled(&phy->dev)) |
| 134 | return; |
| 135 | |
| 136 | pm_runtime_allow(&phy->dev); |
| 137 | } |
| 138 | EXPORT_SYMBOL_GPL(phy_pm_runtime_allow); |
| 139 | |
| 140 | void phy_pm_runtime_forbid(struct phy *phy) |
| 141 | { |
| 142 | if (!pm_runtime_enabled(&phy->dev)) |
| 143 | return; |
| 144 | |
| 145 | pm_runtime_forbid(&phy->dev); |
| 146 | } |
| 147 | EXPORT_SYMBOL_GPL(phy_pm_runtime_forbid); |
| 148 | |
| 149 | int phy_init(struct phy *phy) |
| 150 | { |
| 151 | int ret; |
| 152 | |
| 153 | ret = phy_pm_runtime_get_sync(phy); |
| 154 | if (ret < 0 && ret != -ENOTSUPP) |
| 155 | return ret; |
| 156 | |
| 157 | mutex_lock(&phy->mutex); |
| 158 | if (phy->init_count++ == 0 && phy->ops->init) { |
| 159 | ret = phy->ops->init(phy); |
| 160 | if (ret < 0) { |
| 161 | dev_err(&phy->dev, "phy init failed --> %d\n", ret); |
| 162 | goto out; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | out: |
| 167 | mutex_unlock(&phy->mutex); |
| 168 | phy_pm_runtime_put(phy); |
| 169 | return ret; |
| 170 | } |
| 171 | EXPORT_SYMBOL_GPL(phy_init); |
| 172 | |
| 173 | int phy_exit(struct phy *phy) |
| 174 | { |
| 175 | int ret; |
| 176 | |
| 177 | ret = phy_pm_runtime_get_sync(phy); |
| 178 | if (ret < 0 && ret != -ENOTSUPP) |
| 179 | return ret; |
| 180 | |
| 181 | mutex_lock(&phy->mutex); |
| 182 | if (--phy->init_count == 0 && phy->ops->exit) { |
| 183 | ret = phy->ops->exit(phy); |
| 184 | if (ret < 0) { |
| 185 | dev_err(&phy->dev, "phy exit failed --> %d\n", ret); |
| 186 | goto out; |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | out: |
| 191 | mutex_unlock(&phy->mutex); |
| 192 | phy_pm_runtime_put(phy); |
| 193 | return ret; |
| 194 | } |
| 195 | EXPORT_SYMBOL_GPL(phy_exit); |
| 196 | |
| 197 | int phy_power_on(struct phy *phy) |
| 198 | { |
| 199 | int ret = -ENOTSUPP; |
| 200 | |
| 201 | ret = phy_pm_runtime_get_sync(phy); |
| 202 | if (ret < 0 && ret != -ENOTSUPP) |
| 203 | return ret; |
| 204 | |
| 205 | mutex_lock(&phy->mutex); |
| 206 | if (phy->power_count++ == 0 && phy->ops->power_on) { |
| 207 | ret = phy->ops->power_on(phy); |
| 208 | if (ret < 0) { |
| 209 | dev_err(&phy->dev, "phy poweron failed --> %d\n", ret); |
| 210 | goto out; |
| 211 | } |
| 212 | } |
| 213 | |
| 214 | out: |
| 215 | mutex_unlock(&phy->mutex); |
| 216 | |
| 217 | return ret; |
| 218 | } |
| 219 | EXPORT_SYMBOL_GPL(phy_power_on); |
| 220 | |
| 221 | int phy_power_off(struct phy *phy) |
| 222 | { |
| 223 | int ret = -ENOTSUPP; |
| 224 | |
| 225 | mutex_lock(&phy->mutex); |
| 226 | if (--phy->power_count == 0 && phy->ops->power_off) { |
| 227 | ret = phy->ops->power_off(phy); |
| 228 | if (ret < 0) { |
| 229 | dev_err(&phy->dev, "phy poweroff failed --> %d\n", ret); |
| 230 | goto out; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | out: |
| 235 | mutex_unlock(&phy->mutex); |
| 236 | phy_pm_runtime_put(phy); |
| 237 | |
| 238 | return ret; |
| 239 | } |
| 240 | EXPORT_SYMBOL_GPL(phy_power_off); |
| 241 | |
| 242 | /** |
| 243 | * of_phy_get() - lookup and obtain a reference to a phy by phandle |
| 244 | * @dev: device that requests this phy |
| 245 | * @index: the index of the phy |
| 246 | * |
| 247 | * Returns the phy associated with the given phandle value, |
| 248 | * after getting a refcount to it or -ENODEV if there is no such phy or |
| 249 | * -EPROBE_DEFER if there is a phandle to the phy, but the device is |
| 250 | * not yet loaded. This function uses of_xlate call back function provided |
| 251 | * while registering the phy_provider to find the phy instance. |
| 252 | */ |
| 253 | static struct phy *of_phy_get(struct device *dev, int index) |
| 254 | { |
| 255 | int ret; |
| 256 | struct phy_provider *phy_provider; |
| 257 | struct phy *phy = NULL; |
| 258 | struct of_phandle_args args; |
| 259 | |
| 260 | ret = of_parse_phandle_with_args(dev->of_node, "phys", "#phy-cells", |
| 261 | index, &args); |
| 262 | if (ret) { |
| 263 | dev_dbg(dev, "failed to get phy in %s node\n", |
| 264 | dev->of_node->full_name); |
| 265 | return ERR_PTR(-ENODEV); |
| 266 | } |
| 267 | |
| 268 | mutex_lock(&phy_provider_mutex); |
| 269 | phy_provider = of_phy_provider_lookup(args.np); |
| 270 | if (IS_ERR(phy_provider) || !try_module_get(phy_provider->owner)) { |
| 271 | phy = ERR_PTR(-EPROBE_DEFER); |
| 272 | goto err0; |
| 273 | } |
| 274 | |
| 275 | phy = phy_provider->of_xlate(phy_provider->dev, &args); |
| 276 | module_put(phy_provider->owner); |
| 277 | |
| 278 | err0: |
| 279 | mutex_unlock(&phy_provider_mutex); |
| 280 | of_node_put(args.np); |
| 281 | |
| 282 | return phy; |
| 283 | } |
| 284 | |
| 285 | /** |
| 286 | * phy_put() - release the PHY |
| 287 | * @phy: the phy returned by phy_get() |
| 288 | * |
| 289 | * Releases a refcount the caller received from phy_get(). |
| 290 | */ |
| 291 | void phy_put(struct phy *phy) |
| 292 | { |
| 293 | if (IS_ERR(phy)) |
| 294 | return; |
| 295 | |
| 296 | module_put(phy->ops->owner); |
| 297 | put_device(&phy->dev); |
| 298 | } |
| 299 | EXPORT_SYMBOL_GPL(phy_put); |
| 300 | |
| 301 | /** |
| 302 | * devm_phy_put() - release the PHY |
| 303 | * @dev: device that wants to release this phy |
| 304 | * @phy: the phy returned by devm_phy_get() |
| 305 | * |
| 306 | * destroys the devres associated with this phy and invokes phy_put |
| 307 | * to release the phy. |
| 308 | */ |
| 309 | void devm_phy_put(struct device *dev, struct phy *phy) |
| 310 | { |
| 311 | int r; |
| 312 | |
| 313 | r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy); |
| 314 | dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); |
| 315 | } |
| 316 | EXPORT_SYMBOL_GPL(devm_phy_put); |
| 317 | |
| 318 | /** |
| 319 | * of_phy_simple_xlate() - returns the phy instance from phy provider |
| 320 | * @dev: the PHY provider device |
| 321 | * @args: of_phandle_args (not used here) |
| 322 | * |
| 323 | * Intended to be used by phy provider for the common case where #phy-cells is |
| 324 | * 0. For other cases where #phy-cells is greater than '0', the phy provider |
| 325 | * should provide a custom of_xlate function that reads the *args* and returns |
| 326 | * the appropriate phy. |
| 327 | */ |
| 328 | struct phy *of_phy_simple_xlate(struct device *dev, struct of_phandle_args |
| 329 | *args) |
| 330 | { |
| 331 | struct phy *phy; |
| 332 | struct class_dev_iter iter; |
| 333 | struct device_node *node = dev->of_node; |
| 334 | |
| 335 | class_dev_iter_init(&iter, phy_class, NULL, NULL); |
| 336 | while ((dev = class_dev_iter_next(&iter))) { |
| 337 | phy = to_phy(dev); |
| 338 | if (node != phy->dev.of_node) |
| 339 | continue; |
| 340 | |
| 341 | class_dev_iter_exit(&iter); |
| 342 | return phy; |
| 343 | } |
| 344 | |
| 345 | class_dev_iter_exit(&iter); |
| 346 | return ERR_PTR(-ENODEV); |
| 347 | } |
| 348 | EXPORT_SYMBOL_GPL(of_phy_simple_xlate); |
| 349 | |
| 350 | /** |
| 351 | * phy_get() - lookup and obtain a reference to a phy. |
| 352 | * @dev: device that requests this phy |
| 353 | * @string: the phy name as given in the dt data or the name of the controller |
| 354 | * port for non-dt case |
| 355 | * |
| 356 | * Returns the phy driver, after getting a refcount to it; or |
| 357 | * -ENODEV if there is no such phy. The caller is responsible for |
| 358 | * calling phy_put() to release that count. |
| 359 | */ |
| 360 | struct phy *phy_get(struct device *dev, const char *string) |
| 361 | { |
| 362 | int index = 0; |
| 363 | struct phy *phy = NULL; |
| 364 | |
| 365 | if (string == NULL) { |
| 366 | dev_WARN(dev, "missing string\n"); |
| 367 | return ERR_PTR(-EINVAL); |
| 368 | } |
| 369 | |
| 370 | if (dev->of_node) { |
| 371 | index = of_property_match_string(dev->of_node, "phy-names", |
| 372 | string); |
| 373 | phy = of_phy_get(dev, index); |
| 374 | if (IS_ERR(phy)) { |
| 375 | dev_err(dev, "unable to find phy\n"); |
| 376 | return phy; |
| 377 | } |
| 378 | } else { |
| 379 | phy = phy_lookup(dev, string); |
| 380 | if (IS_ERR(phy)) { |
| 381 | dev_err(dev, "unable to find phy\n"); |
| 382 | return phy; |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | if (!try_module_get(phy->ops->owner)) |
| 387 | return ERR_PTR(-EPROBE_DEFER); |
| 388 | |
| 389 | get_device(&phy->dev); |
| 390 | |
| 391 | return phy; |
| 392 | } |
| 393 | EXPORT_SYMBOL_GPL(phy_get); |
| 394 | |
| 395 | /** |
| 396 | * devm_phy_get() - lookup and obtain a reference to a phy. |
| 397 | * @dev: device that requests this phy |
| 398 | * @string: the phy name as given in the dt data or phy device name |
| 399 | * for non-dt case |
| 400 | * |
| 401 | * Gets the phy using phy_get(), and associates a device with it using |
| 402 | * devres. On driver detach, release function is invoked on the devres data, |
| 403 | * then, devres data is freed. |
| 404 | */ |
| 405 | struct phy *devm_phy_get(struct device *dev, const char *string) |
| 406 | { |
| 407 | struct phy **ptr, *phy; |
| 408 | |
| 409 | ptr = devres_alloc(devm_phy_release, sizeof(*ptr), GFP_KERNEL); |
| 410 | if (!ptr) |
| 411 | return ERR_PTR(-ENOMEM); |
| 412 | |
| 413 | phy = phy_get(dev, string); |
| 414 | if (!IS_ERR(phy)) { |
| 415 | *ptr = phy; |
| 416 | devres_add(dev, ptr); |
| 417 | } else { |
| 418 | devres_free(ptr); |
| 419 | } |
| 420 | |
| 421 | return phy; |
| 422 | } |
| 423 | EXPORT_SYMBOL_GPL(devm_phy_get); |
| 424 | |
| 425 | /** |
| 426 | * phy_create() - create a new phy |
| 427 | * @dev: device that is creating the new phy |
| 428 | * @ops: function pointers for performing phy operations |
| 429 | * @init_data: contains the list of PHY consumers or NULL |
| 430 | * |
| 431 | * Called to create a phy using phy framework. |
| 432 | */ |
| 433 | struct phy *phy_create(struct device *dev, const struct phy_ops *ops, |
| 434 | struct phy_init_data *init_data) |
| 435 | { |
| 436 | int ret; |
| 437 | int id; |
| 438 | struct phy *phy; |
| 439 | |
Dan Carpenter | 52797d2 | 2013-12-06 17:51:19 +0530 | [diff] [blame] | 440 | if (WARN_ON(!dev)) |
| 441 | return ERR_PTR(-EINVAL); |
Kishon Vijay Abraham I | ff76496 | 2013-09-27 11:53:25 +0530 | [diff] [blame] | 442 | |
| 443 | phy = kzalloc(sizeof(*phy), GFP_KERNEL); |
Dan Carpenter | 52797d2 | 2013-12-06 17:51:19 +0530 | [diff] [blame] | 444 | if (!phy) |
| 445 | return ERR_PTR(-ENOMEM); |
Kishon Vijay Abraham I | ff76496 | 2013-09-27 11:53:25 +0530 | [diff] [blame] | 446 | |
| 447 | id = ida_simple_get(&phy_ida, 0, 0, GFP_KERNEL); |
| 448 | if (id < 0) { |
| 449 | dev_err(dev, "unable to get id\n"); |
| 450 | ret = id; |
Dan Carpenter | 52797d2 | 2013-12-06 17:51:19 +0530 | [diff] [blame] | 451 | goto free_phy; |
Kishon Vijay Abraham I | ff76496 | 2013-09-27 11:53:25 +0530 | [diff] [blame] | 452 | } |
| 453 | |
| 454 | device_initialize(&phy->dev); |
| 455 | mutex_init(&phy->mutex); |
| 456 | |
| 457 | phy->dev.class = phy_class; |
| 458 | phy->dev.parent = dev; |
| 459 | phy->dev.of_node = dev->of_node; |
| 460 | phy->id = id; |
| 461 | phy->ops = ops; |
| 462 | phy->init_data = init_data; |
| 463 | |
| 464 | ret = dev_set_name(&phy->dev, "phy-%s.%d", dev_name(dev), id); |
| 465 | if (ret) |
Dan Carpenter | 52797d2 | 2013-12-06 17:51:19 +0530 | [diff] [blame] | 466 | goto put_dev; |
Kishon Vijay Abraham I | ff76496 | 2013-09-27 11:53:25 +0530 | [diff] [blame] | 467 | |
| 468 | ret = device_add(&phy->dev); |
| 469 | if (ret) |
Dan Carpenter | 52797d2 | 2013-12-06 17:51:19 +0530 | [diff] [blame] | 470 | goto put_dev; |
Kishon Vijay Abraham I | ff76496 | 2013-09-27 11:53:25 +0530 | [diff] [blame] | 471 | |
| 472 | if (pm_runtime_enabled(dev)) { |
| 473 | pm_runtime_enable(&phy->dev); |
| 474 | pm_runtime_no_callbacks(&phy->dev); |
| 475 | } |
| 476 | |
| 477 | return phy; |
| 478 | |
Dan Carpenter | 52797d2 | 2013-12-06 17:51:19 +0530 | [diff] [blame] | 479 | put_dev: |
Kishon Vijay Abraham I | ff76496 | 2013-09-27 11:53:25 +0530 | [diff] [blame] | 480 | put_device(&phy->dev); |
Dan Carpenter | 52797d2 | 2013-12-06 17:51:19 +0530 | [diff] [blame] | 481 | ida_remove(&phy_ida, phy->id); |
| 482 | free_phy: |
Kishon Vijay Abraham I | ff76496 | 2013-09-27 11:53:25 +0530 | [diff] [blame] | 483 | kfree(phy); |
Kishon Vijay Abraham I | ff76496 | 2013-09-27 11:53:25 +0530 | [diff] [blame] | 484 | return ERR_PTR(ret); |
| 485 | } |
| 486 | EXPORT_SYMBOL_GPL(phy_create); |
| 487 | |
| 488 | /** |
| 489 | * devm_phy_create() - create a new phy |
| 490 | * @dev: device that is creating the new phy |
| 491 | * @ops: function pointers for performing phy operations |
| 492 | * @init_data: contains the list of PHY consumers or NULL |
| 493 | * |
| 494 | * Creates a new PHY device adding it to the PHY class. |
| 495 | * While at that, it also associates the device with the phy using devres. |
| 496 | * On driver detach, release function is invoked on the devres data, |
| 497 | * then, devres data is freed. |
| 498 | */ |
| 499 | struct phy *devm_phy_create(struct device *dev, const struct phy_ops *ops, |
| 500 | struct phy_init_data *init_data) |
| 501 | { |
| 502 | struct phy **ptr, *phy; |
| 503 | |
| 504 | ptr = devres_alloc(devm_phy_consume, sizeof(*ptr), GFP_KERNEL); |
| 505 | if (!ptr) |
| 506 | return ERR_PTR(-ENOMEM); |
| 507 | |
| 508 | phy = phy_create(dev, ops, init_data); |
| 509 | if (!IS_ERR(phy)) { |
| 510 | *ptr = phy; |
| 511 | devres_add(dev, ptr); |
| 512 | } else { |
| 513 | devres_free(ptr); |
| 514 | } |
| 515 | |
| 516 | return phy; |
| 517 | } |
| 518 | EXPORT_SYMBOL_GPL(devm_phy_create); |
| 519 | |
| 520 | /** |
| 521 | * phy_destroy() - destroy the phy |
| 522 | * @phy: the phy to be destroyed |
| 523 | * |
| 524 | * Called to destroy the phy. |
| 525 | */ |
| 526 | void phy_destroy(struct phy *phy) |
| 527 | { |
| 528 | pm_runtime_disable(&phy->dev); |
| 529 | device_unregister(&phy->dev); |
| 530 | } |
| 531 | EXPORT_SYMBOL_GPL(phy_destroy); |
| 532 | |
| 533 | /** |
| 534 | * devm_phy_destroy() - destroy the PHY |
| 535 | * @dev: device that wants to release this phy |
| 536 | * @phy: the phy returned by devm_phy_get() |
| 537 | * |
| 538 | * destroys the devres associated with this phy and invokes phy_destroy |
| 539 | * to destroy the phy. |
| 540 | */ |
| 541 | void devm_phy_destroy(struct device *dev, struct phy *phy) |
| 542 | { |
| 543 | int r; |
| 544 | |
| 545 | r = devres_destroy(dev, devm_phy_consume, devm_phy_match, phy); |
| 546 | dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); |
| 547 | } |
| 548 | EXPORT_SYMBOL_GPL(devm_phy_destroy); |
| 549 | |
| 550 | /** |
| 551 | * __of_phy_provider_register() - create/register phy provider with the framework |
| 552 | * @dev: struct device of the phy provider |
| 553 | * @owner: the module owner containing of_xlate |
| 554 | * @of_xlate: function pointer to obtain phy instance from phy provider |
| 555 | * |
| 556 | * Creates struct phy_provider from dev and of_xlate function pointer. |
| 557 | * This is used in the case of dt boot for finding the phy instance from |
| 558 | * phy provider. |
| 559 | */ |
| 560 | struct phy_provider *__of_phy_provider_register(struct device *dev, |
| 561 | struct module *owner, struct phy * (*of_xlate)(struct device *dev, |
| 562 | struct of_phandle_args *args)) |
| 563 | { |
| 564 | struct phy_provider *phy_provider; |
| 565 | |
| 566 | phy_provider = kzalloc(sizeof(*phy_provider), GFP_KERNEL); |
| 567 | if (!phy_provider) |
| 568 | return ERR_PTR(-ENOMEM); |
| 569 | |
| 570 | phy_provider->dev = dev; |
| 571 | phy_provider->owner = owner; |
| 572 | phy_provider->of_xlate = of_xlate; |
| 573 | |
| 574 | mutex_lock(&phy_provider_mutex); |
| 575 | list_add_tail(&phy_provider->list, &phy_provider_list); |
| 576 | mutex_unlock(&phy_provider_mutex); |
| 577 | |
| 578 | return phy_provider; |
| 579 | } |
| 580 | EXPORT_SYMBOL_GPL(__of_phy_provider_register); |
| 581 | |
| 582 | /** |
| 583 | * __devm_of_phy_provider_register() - create/register phy provider with the |
| 584 | * framework |
| 585 | * @dev: struct device of the phy provider |
| 586 | * @owner: the module owner containing of_xlate |
| 587 | * @of_xlate: function pointer to obtain phy instance from phy provider |
| 588 | * |
| 589 | * Creates struct phy_provider from dev and of_xlate function pointer. |
| 590 | * This is used in the case of dt boot for finding the phy instance from |
| 591 | * phy provider. While at that, it also associates the device with the |
| 592 | * phy provider using devres. On driver detach, release function is invoked |
| 593 | * on the devres data, then, devres data is freed. |
| 594 | */ |
| 595 | struct phy_provider *__devm_of_phy_provider_register(struct device *dev, |
| 596 | struct module *owner, struct phy * (*of_xlate)(struct device *dev, |
| 597 | struct of_phandle_args *args)) |
| 598 | { |
| 599 | struct phy_provider **ptr, *phy_provider; |
| 600 | |
| 601 | ptr = devres_alloc(devm_phy_provider_release, sizeof(*ptr), GFP_KERNEL); |
| 602 | if (!ptr) |
| 603 | return ERR_PTR(-ENOMEM); |
| 604 | |
| 605 | phy_provider = __of_phy_provider_register(dev, owner, of_xlate); |
| 606 | if (!IS_ERR(phy_provider)) { |
| 607 | *ptr = phy_provider; |
| 608 | devres_add(dev, ptr); |
| 609 | } else { |
| 610 | devres_free(ptr); |
| 611 | } |
| 612 | |
| 613 | return phy_provider; |
| 614 | } |
| 615 | EXPORT_SYMBOL_GPL(__devm_of_phy_provider_register); |
| 616 | |
| 617 | /** |
| 618 | * of_phy_provider_unregister() - unregister phy provider from the framework |
| 619 | * @phy_provider: phy provider returned by of_phy_provider_register() |
| 620 | * |
| 621 | * Removes the phy_provider created using of_phy_provider_register(). |
| 622 | */ |
| 623 | void of_phy_provider_unregister(struct phy_provider *phy_provider) |
| 624 | { |
| 625 | if (IS_ERR(phy_provider)) |
| 626 | return; |
| 627 | |
| 628 | mutex_lock(&phy_provider_mutex); |
| 629 | list_del(&phy_provider->list); |
| 630 | kfree(phy_provider); |
| 631 | mutex_unlock(&phy_provider_mutex); |
| 632 | } |
| 633 | EXPORT_SYMBOL_GPL(of_phy_provider_unregister); |
| 634 | |
| 635 | /** |
| 636 | * devm_of_phy_provider_unregister() - remove phy provider from the framework |
| 637 | * @dev: struct device of the phy provider |
| 638 | * |
| 639 | * destroys the devres associated with this phy provider and invokes |
| 640 | * of_phy_provider_unregister to unregister the phy provider. |
| 641 | */ |
| 642 | void devm_of_phy_provider_unregister(struct device *dev, |
| 643 | struct phy_provider *phy_provider) { |
| 644 | int r; |
| 645 | |
| 646 | r = devres_destroy(dev, devm_phy_provider_release, devm_phy_match, |
| 647 | phy_provider); |
| 648 | dev_WARN_ONCE(dev, r, "couldn't find PHY provider device resource\n"); |
| 649 | } |
| 650 | EXPORT_SYMBOL_GPL(devm_of_phy_provider_unregister); |
| 651 | |
| 652 | /** |
| 653 | * phy_release() - release the phy |
| 654 | * @dev: the dev member within phy |
| 655 | * |
| 656 | * When the last reference to the device is removed, it is called |
| 657 | * from the embedded kobject as release method. |
| 658 | */ |
| 659 | static void phy_release(struct device *dev) |
| 660 | { |
| 661 | struct phy *phy; |
| 662 | |
| 663 | phy = to_phy(dev); |
| 664 | dev_vdbg(dev, "releasing '%s'\n", dev_name(dev)); |
| 665 | ida_remove(&phy_ida, phy->id); |
| 666 | kfree(phy); |
| 667 | } |
| 668 | |
| 669 | static int __init phy_core_init(void) |
| 670 | { |
| 671 | phy_class = class_create(THIS_MODULE, "phy"); |
| 672 | if (IS_ERR(phy_class)) { |
| 673 | pr_err("failed to create phy class --> %ld\n", |
| 674 | PTR_ERR(phy_class)); |
| 675 | return PTR_ERR(phy_class); |
| 676 | } |
| 677 | |
| 678 | phy_class->dev_release = phy_release; |
| 679 | |
| 680 | return 0; |
| 681 | } |
| 682 | module_init(phy_core_init); |
| 683 | |
| 684 | static void __exit phy_core_exit(void) |
| 685 | { |
| 686 | class_destroy(phy_class); |
| 687 | } |
| 688 | module_exit(phy_core_exit); |
| 689 | |
| 690 | MODULE_DESCRIPTION("Generic PHY Framework"); |
| 691 | MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>"); |
| 692 | MODULE_LICENSE("GPL v2"); |