| 1 | /* MDIO Bus interface |
| 2 | * |
| 3 | * Author: Andy Fleming |
| 4 | * |
| 5 | * Copyright (c) 2004 Freescale Semiconductor, Inc. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License as published by the |
| 9 | * Free Software Foundation; either version 2 of the License, or (at your |
| 10 | * option) any later version. |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/unistd.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/interrupt.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/device.h> |
| 25 | #include <linux/of_device.h> |
| 26 | #include <linux/of_mdio.h> |
| 27 | #include <linux/netdevice.h> |
| 28 | #include <linux/etherdevice.h> |
| 29 | #include <linux/skbuff.h> |
| 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/mm.h> |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/mii.h> |
| 34 | #include <linux/ethtool.h> |
| 35 | #include <linux/phy.h> |
| 36 | #include <linux/io.h> |
| 37 | #include <linux/uaccess.h> |
| 38 | |
| 39 | #include <asm/irq.h> |
| 40 | |
| 41 | int mdiobus_register_device(struct mdio_device *mdiodev) |
| 42 | { |
| 43 | if (mdiodev->bus->mdio_map[mdiodev->addr]) |
| 44 | return -EBUSY; |
| 45 | |
| 46 | mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev; |
| 47 | |
| 48 | return 0; |
| 49 | } |
| 50 | EXPORT_SYMBOL(mdiobus_register_device); |
| 51 | |
| 52 | int mdiobus_unregister_device(struct mdio_device *mdiodev) |
| 53 | { |
| 54 | if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev) |
| 55 | return -EINVAL; |
| 56 | |
| 57 | mdiodev->bus->mdio_map[mdiodev->addr] = NULL; |
| 58 | |
| 59 | return 0; |
| 60 | } |
| 61 | EXPORT_SYMBOL(mdiobus_unregister_device); |
| 62 | |
| 63 | struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr) |
| 64 | { |
| 65 | struct mdio_device *mdiodev = bus->mdio_map[addr]; |
| 66 | |
| 67 | if (!mdiodev) |
| 68 | return NULL; |
| 69 | |
| 70 | if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY)) |
| 71 | return NULL; |
| 72 | |
| 73 | return container_of(mdiodev, struct phy_device, mdio); |
| 74 | } |
| 75 | EXPORT_SYMBOL(mdiobus_get_phy); |
| 76 | |
| 77 | bool mdiobus_is_registered_device(struct mii_bus *bus, int addr) |
| 78 | { |
| 79 | return bus->mdio_map[addr]; |
| 80 | } |
| 81 | EXPORT_SYMBOL(mdiobus_is_registered_device); |
| 82 | |
| 83 | /** |
| 84 | * mdiobus_alloc_size - allocate a mii_bus structure |
| 85 | * @size: extra amount of memory to allocate for private storage. |
| 86 | * If non-zero, then bus->priv is points to that memory. |
| 87 | * |
| 88 | * Description: called by a bus driver to allocate an mii_bus |
| 89 | * structure to fill in. |
| 90 | */ |
| 91 | struct mii_bus *mdiobus_alloc_size(size_t size) |
| 92 | { |
| 93 | struct mii_bus *bus; |
| 94 | size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN); |
| 95 | size_t alloc_size; |
| 96 | int i; |
| 97 | |
| 98 | /* If we alloc extra space, it should be aligned */ |
| 99 | if (size) |
| 100 | alloc_size = aligned_size + size; |
| 101 | else |
| 102 | alloc_size = sizeof(*bus); |
| 103 | |
| 104 | bus = kzalloc(alloc_size, GFP_KERNEL); |
| 105 | if (!bus) |
| 106 | return NULL; |
| 107 | |
| 108 | bus->state = MDIOBUS_ALLOCATED; |
| 109 | if (size) |
| 110 | bus->priv = (void *)bus + aligned_size; |
| 111 | |
| 112 | /* Initialise the interrupts to polling */ |
| 113 | for (i = 0; i < PHY_MAX_ADDR; i++) |
| 114 | bus->irq[i] = PHY_POLL; |
| 115 | |
| 116 | return bus; |
| 117 | } |
| 118 | EXPORT_SYMBOL(mdiobus_alloc_size); |
| 119 | |
| 120 | static void _devm_mdiobus_free(struct device *dev, void *res) |
| 121 | { |
| 122 | mdiobus_free(*(struct mii_bus **)res); |
| 123 | } |
| 124 | |
| 125 | static int devm_mdiobus_match(struct device *dev, void *res, void *data) |
| 126 | { |
| 127 | struct mii_bus **r = res; |
| 128 | |
| 129 | if (WARN_ON(!r || !*r)) |
| 130 | return 0; |
| 131 | |
| 132 | return *r == data; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * devm_mdiobus_alloc_size - Resource-managed mdiobus_alloc_size() |
| 137 | * @dev: Device to allocate mii_bus for |
| 138 | * @sizeof_priv: Space to allocate for private structure. |
| 139 | * |
| 140 | * Managed mdiobus_alloc_size. mii_bus allocated with this function is |
| 141 | * automatically freed on driver detach. |
| 142 | * |
| 143 | * If an mii_bus allocated with this function needs to be freed separately, |
| 144 | * devm_mdiobus_free() must be used. |
| 145 | * |
| 146 | * RETURNS: |
| 147 | * Pointer to allocated mii_bus on success, NULL on failure. |
| 148 | */ |
| 149 | struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv) |
| 150 | { |
| 151 | struct mii_bus **ptr, *bus; |
| 152 | |
| 153 | ptr = devres_alloc(_devm_mdiobus_free, sizeof(*ptr), GFP_KERNEL); |
| 154 | if (!ptr) |
| 155 | return NULL; |
| 156 | |
| 157 | /* use raw alloc_dr for kmalloc caller tracing */ |
| 158 | bus = mdiobus_alloc_size(sizeof_priv); |
| 159 | if (bus) { |
| 160 | *ptr = bus; |
| 161 | devres_add(dev, ptr); |
| 162 | } else { |
| 163 | devres_free(ptr); |
| 164 | } |
| 165 | |
| 166 | return bus; |
| 167 | } |
| 168 | EXPORT_SYMBOL_GPL(devm_mdiobus_alloc_size); |
| 169 | |
| 170 | /** |
| 171 | * devm_mdiobus_free - Resource-managed mdiobus_free() |
| 172 | * @dev: Device this mii_bus belongs to |
| 173 | * @bus: the mii_bus associated with the device |
| 174 | * |
| 175 | * Free mii_bus allocated with devm_mdiobus_alloc_size(). |
| 176 | */ |
| 177 | void devm_mdiobus_free(struct device *dev, struct mii_bus *bus) |
| 178 | { |
| 179 | int rc; |
| 180 | |
| 181 | rc = devres_release(dev, _devm_mdiobus_free, |
| 182 | devm_mdiobus_match, bus); |
| 183 | WARN_ON(rc); |
| 184 | } |
| 185 | EXPORT_SYMBOL_GPL(devm_mdiobus_free); |
| 186 | |
| 187 | /** |
| 188 | * mdiobus_release - mii_bus device release callback |
| 189 | * @d: the target struct device that contains the mii_bus |
| 190 | * |
| 191 | * Description: called when the last reference to an mii_bus is |
| 192 | * dropped, to free the underlying memory. |
| 193 | */ |
| 194 | static void mdiobus_release(struct device *d) |
| 195 | { |
| 196 | struct mii_bus *bus = to_mii_bus(d); |
| 197 | BUG_ON(bus->state != MDIOBUS_RELEASED && |
| 198 | /* for compatibility with error handling in drivers */ |
| 199 | bus->state != MDIOBUS_ALLOCATED); |
| 200 | kfree(bus); |
| 201 | } |
| 202 | |
| 203 | static struct class mdio_bus_class = { |
| 204 | .name = "mdio_bus", |
| 205 | .dev_release = mdiobus_release, |
| 206 | }; |
| 207 | |
| 208 | #if IS_ENABLED(CONFIG_OF_MDIO) |
| 209 | /* Helper function for of_mdio_find_bus */ |
| 210 | static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np) |
| 211 | { |
| 212 | return dev->of_node == mdio_bus_np; |
| 213 | } |
| 214 | /** |
| 215 | * of_mdio_find_bus - Given an mii_bus node, find the mii_bus. |
| 216 | * @mdio_bus_np: Pointer to the mii_bus. |
| 217 | * |
| 218 | * Returns a reference to the mii_bus, or NULL if none found. The |
| 219 | * embedded struct device will have its reference count incremented, |
| 220 | * and this must be put once the bus is finished with. |
| 221 | * |
| 222 | * Because the association of a device_node and mii_bus is made via |
| 223 | * of_mdiobus_register(), the mii_bus cannot be found before it is |
| 224 | * registered with of_mdiobus_register(). |
| 225 | * |
| 226 | */ |
| 227 | struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np) |
| 228 | { |
| 229 | struct device *d; |
| 230 | |
| 231 | if (!mdio_bus_np) |
| 232 | return NULL; |
| 233 | |
| 234 | d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np, |
| 235 | of_mdio_bus_match); |
| 236 | |
| 237 | return d ? to_mii_bus(d) : NULL; |
| 238 | } |
| 239 | EXPORT_SYMBOL(of_mdio_find_bus); |
| 240 | |
| 241 | /* Walk the list of subnodes of a mdio bus and look for a node that |
| 242 | * matches the mdio device's address with its 'reg' property. If |
| 243 | * found, set the of_node pointer for the mdio device. This allows |
| 244 | * auto-probed phy devices to be supplied with information passed in |
| 245 | * via DT. |
| 246 | */ |
| 247 | static void of_mdiobus_link_mdiodev(struct mii_bus *bus, |
| 248 | struct mdio_device *mdiodev) |
| 249 | { |
| 250 | struct device *dev = &mdiodev->dev; |
| 251 | struct device_node *child; |
| 252 | |
| 253 | if (dev->of_node || !bus->dev.of_node) |
| 254 | return; |
| 255 | |
| 256 | for_each_available_child_of_node(bus->dev.of_node, child) { |
| 257 | int addr; |
| 258 | int ret; |
| 259 | |
| 260 | ret = of_property_read_u32(child, "reg", &addr); |
| 261 | if (ret < 0) { |
| 262 | dev_err(dev, "%s has invalid MDIO address\n", |
| 263 | child->full_name); |
| 264 | continue; |
| 265 | } |
| 266 | |
| 267 | /* A MDIO device must have a reg property in the range [0-31] */ |
| 268 | if (addr >= PHY_MAX_ADDR) { |
| 269 | dev_err(dev, "%s MDIO address %i is too large\n", |
| 270 | child->full_name, addr); |
| 271 | continue; |
| 272 | } |
| 273 | |
| 274 | if (addr == mdiodev->addr) { |
| 275 | dev->of_node = child; |
| 276 | return; |
| 277 | } |
| 278 | } |
| 279 | } |
| 280 | #else /* !IS_ENABLED(CONFIG_OF_MDIO) */ |
| 281 | static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio, |
| 282 | struct mdio_device *mdiodev) |
| 283 | { |
| 284 | } |
| 285 | #endif |
| 286 | |
| 287 | /** |
| 288 | * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus |
| 289 | * @bus: target mii_bus |
| 290 | * @owner: module containing bus accessor functions |
| 291 | * |
| 292 | * Description: Called by a bus driver to bring up all the PHYs |
| 293 | * on a given bus, and attach them to the bus. Drivers should use |
| 294 | * mdiobus_register() rather than __mdiobus_register() unless they |
| 295 | * need to pass a specific owner module. MDIO devices which are not |
| 296 | * PHYs will not be brought up by this function. They are expected to |
| 297 | * to be explicitly listed in DT and instantiated by of_mdiobus_register(). |
| 298 | * |
| 299 | * Returns 0 on success or < 0 on error. |
| 300 | */ |
| 301 | int __mdiobus_register(struct mii_bus *bus, struct module *owner) |
| 302 | { |
| 303 | struct mdio_device *mdiodev; |
| 304 | int i, err; |
| 305 | |
| 306 | if (NULL == bus || NULL == bus->name || |
| 307 | NULL == bus->read || NULL == bus->write) |
| 308 | return -EINVAL; |
| 309 | |
| 310 | BUG_ON(bus->state != MDIOBUS_ALLOCATED && |
| 311 | bus->state != MDIOBUS_UNREGISTERED); |
| 312 | |
| 313 | bus->owner = owner; |
| 314 | bus->dev.parent = bus->parent; |
| 315 | bus->dev.class = &mdio_bus_class; |
| 316 | bus->dev.groups = NULL; |
| 317 | dev_set_name(&bus->dev, "%s", bus->id); |
| 318 | |
| 319 | err = device_register(&bus->dev); |
| 320 | if (err) { |
| 321 | pr_err("mii_bus %s failed to register\n", bus->id); |
| 322 | put_device(&bus->dev); |
| 323 | return -EINVAL; |
| 324 | } |
| 325 | |
| 326 | mutex_init(&bus->mdio_lock); |
| 327 | |
| 328 | if (bus->reset) |
| 329 | bus->reset(bus); |
| 330 | |
| 331 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
| 332 | if ((bus->phy_mask & (1 << i)) == 0) { |
| 333 | struct phy_device *phydev; |
| 334 | |
| 335 | phydev = mdiobus_scan(bus, i); |
| 336 | if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV)) { |
| 337 | err = PTR_ERR(phydev); |
| 338 | goto error; |
| 339 | } |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | bus->state = MDIOBUS_REGISTERED; |
| 344 | pr_info("%s: probed\n", bus->name); |
| 345 | return 0; |
| 346 | |
| 347 | error: |
| 348 | while (--i >= 0) { |
| 349 | mdiodev = bus->mdio_map[i]; |
| 350 | if (!mdiodev) |
| 351 | continue; |
| 352 | |
| 353 | mdiodev->device_remove(mdiodev); |
| 354 | mdiodev->device_free(mdiodev); |
| 355 | } |
| 356 | device_del(&bus->dev); |
| 357 | return err; |
| 358 | } |
| 359 | EXPORT_SYMBOL(__mdiobus_register); |
| 360 | |
| 361 | void mdiobus_unregister(struct mii_bus *bus) |
| 362 | { |
| 363 | struct mdio_device *mdiodev; |
| 364 | int i; |
| 365 | |
| 366 | BUG_ON(bus->state != MDIOBUS_REGISTERED); |
| 367 | bus->state = MDIOBUS_UNREGISTERED; |
| 368 | |
| 369 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
| 370 | mdiodev = bus->mdio_map[i]; |
| 371 | if (!mdiodev) |
| 372 | continue; |
| 373 | |
| 374 | mdiodev->device_remove(mdiodev); |
| 375 | mdiodev->device_free(mdiodev); |
| 376 | } |
| 377 | device_del(&bus->dev); |
| 378 | } |
| 379 | EXPORT_SYMBOL(mdiobus_unregister); |
| 380 | |
| 381 | /** |
| 382 | * mdiobus_free - free a struct mii_bus |
| 383 | * @bus: mii_bus to free |
| 384 | * |
| 385 | * This function releases the reference to the underlying device |
| 386 | * object in the mii_bus. If this is the last reference, the mii_bus |
| 387 | * will be freed. |
| 388 | */ |
| 389 | void mdiobus_free(struct mii_bus *bus) |
| 390 | { |
| 391 | /* For compatibility with error handling in drivers. */ |
| 392 | if (bus->state == MDIOBUS_ALLOCATED) { |
| 393 | kfree(bus); |
| 394 | return; |
| 395 | } |
| 396 | |
| 397 | BUG_ON(bus->state != MDIOBUS_UNREGISTERED); |
| 398 | bus->state = MDIOBUS_RELEASED; |
| 399 | |
| 400 | put_device(&bus->dev); |
| 401 | } |
| 402 | EXPORT_SYMBOL(mdiobus_free); |
| 403 | |
| 404 | /** |
| 405 | * mdiobus_scan - scan a bus for MDIO devices. |
| 406 | * @bus: mii_bus to scan |
| 407 | * @addr: address on bus to scan |
| 408 | * |
| 409 | * This function scans the MDIO bus, looking for devices which can be |
| 410 | * identified using a vendor/product ID in registers 2 and 3. Not all |
| 411 | * MDIO devices have such registers, but PHY devices typically |
| 412 | * do. Hence this function assumes anything found is a PHY, or can be |
| 413 | * treated as a PHY. Other MDIO devices, such as switches, will |
| 414 | * probably not be found during the scan. |
| 415 | */ |
| 416 | struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr) |
| 417 | { |
| 418 | struct phy_device *phydev; |
| 419 | int err; |
| 420 | |
| 421 | phydev = get_phy_device(bus, addr, false); |
| 422 | if (IS_ERR(phydev)) |
| 423 | return phydev; |
| 424 | |
| 425 | /* |
| 426 | * For DT, see if the auto-probed phy has a correspoding child |
| 427 | * in the bus node, and set the of_node pointer in this case. |
| 428 | */ |
| 429 | of_mdiobus_link_mdiodev(bus, &phydev->mdio); |
| 430 | |
| 431 | err = phy_device_register(phydev); |
| 432 | if (err) { |
| 433 | phy_device_free(phydev); |
| 434 | return ERR_PTR(-ENODEV); |
| 435 | } |
| 436 | |
| 437 | return phydev; |
| 438 | } |
| 439 | EXPORT_SYMBOL(mdiobus_scan); |
| 440 | |
| 441 | /** |
| 442 | * mdiobus_read_nested - Nested version of the mdiobus_read function |
| 443 | * @bus: the mii_bus struct |
| 444 | * @addr: the phy address |
| 445 | * @regnum: register number to read |
| 446 | * |
| 447 | * In case of nested MDIO bus access avoid lockdep false positives by |
| 448 | * using mutex_lock_nested(). |
| 449 | * |
| 450 | * NOTE: MUST NOT be called from interrupt context, |
| 451 | * because the bus read/write functions may wait for an interrupt |
| 452 | * to conclude the operation. |
| 453 | */ |
| 454 | int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum) |
| 455 | { |
| 456 | int retval; |
| 457 | |
| 458 | BUG_ON(in_interrupt()); |
| 459 | |
| 460 | mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); |
| 461 | retval = bus->read(bus, addr, regnum); |
| 462 | mutex_unlock(&bus->mdio_lock); |
| 463 | |
| 464 | return retval; |
| 465 | } |
| 466 | EXPORT_SYMBOL(mdiobus_read_nested); |
| 467 | |
| 468 | /** |
| 469 | * mdiobus_read - Convenience function for reading a given MII mgmt register |
| 470 | * @bus: the mii_bus struct |
| 471 | * @addr: the phy address |
| 472 | * @regnum: register number to read |
| 473 | * |
| 474 | * NOTE: MUST NOT be called from interrupt context, |
| 475 | * because the bus read/write functions may wait for an interrupt |
| 476 | * to conclude the operation. |
| 477 | */ |
| 478 | int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) |
| 479 | { |
| 480 | int retval; |
| 481 | |
| 482 | BUG_ON(in_interrupt()); |
| 483 | |
| 484 | mutex_lock(&bus->mdio_lock); |
| 485 | retval = bus->read(bus, addr, regnum); |
| 486 | mutex_unlock(&bus->mdio_lock); |
| 487 | |
| 488 | return retval; |
| 489 | } |
| 490 | EXPORT_SYMBOL(mdiobus_read); |
| 491 | |
| 492 | /** |
| 493 | * mdiobus_write_nested - Nested version of the mdiobus_write function |
| 494 | * @bus: the mii_bus struct |
| 495 | * @addr: the phy address |
| 496 | * @regnum: register number to write |
| 497 | * @val: value to write to @regnum |
| 498 | * |
| 499 | * In case of nested MDIO bus access avoid lockdep false positives by |
| 500 | * using mutex_lock_nested(). |
| 501 | * |
| 502 | * NOTE: MUST NOT be called from interrupt context, |
| 503 | * because the bus read/write functions may wait for an interrupt |
| 504 | * to conclude the operation. |
| 505 | */ |
| 506 | int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val) |
| 507 | { |
| 508 | int err; |
| 509 | |
| 510 | BUG_ON(in_interrupt()); |
| 511 | |
| 512 | mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); |
| 513 | err = bus->write(bus, addr, regnum, val); |
| 514 | mutex_unlock(&bus->mdio_lock); |
| 515 | |
| 516 | return err; |
| 517 | } |
| 518 | EXPORT_SYMBOL(mdiobus_write_nested); |
| 519 | |
| 520 | /** |
| 521 | * mdiobus_write - Convenience function for writing a given MII mgmt register |
| 522 | * @bus: the mii_bus struct |
| 523 | * @addr: the phy address |
| 524 | * @regnum: register number to write |
| 525 | * @val: value to write to @regnum |
| 526 | * |
| 527 | * NOTE: MUST NOT be called from interrupt context, |
| 528 | * because the bus read/write functions may wait for an interrupt |
| 529 | * to conclude the operation. |
| 530 | */ |
| 531 | int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) |
| 532 | { |
| 533 | int err; |
| 534 | |
| 535 | BUG_ON(in_interrupt()); |
| 536 | |
| 537 | mutex_lock(&bus->mdio_lock); |
| 538 | err = bus->write(bus, addr, regnum, val); |
| 539 | mutex_unlock(&bus->mdio_lock); |
| 540 | |
| 541 | return err; |
| 542 | } |
| 543 | EXPORT_SYMBOL(mdiobus_write); |
| 544 | |
| 545 | /** |
| 546 | * mdio_bus_match - determine if given MDIO driver supports the given |
| 547 | * MDIO device |
| 548 | * @dev: target MDIO device |
| 549 | * @drv: given MDIO driver |
| 550 | * |
| 551 | * Description: Given a MDIO device, and a MDIO driver, return 1 if |
| 552 | * the driver supports the device. Otherwise, return 0. This may |
| 553 | * require calling the devices own match function, since different classes |
| 554 | * of MDIO devices have different match criteria. |
| 555 | */ |
| 556 | static int mdio_bus_match(struct device *dev, struct device_driver *drv) |
| 557 | { |
| 558 | struct mdio_device *mdio = to_mdio_device(dev); |
| 559 | |
| 560 | if (of_driver_match_device(dev, drv)) |
| 561 | return 1; |
| 562 | |
| 563 | if (mdio->bus_match) |
| 564 | return mdio->bus_match(dev, drv); |
| 565 | |
| 566 | return 0; |
| 567 | } |
| 568 | |
| 569 | #ifdef CONFIG_PM |
| 570 | static int mdio_bus_suspend(struct device *dev) |
| 571 | { |
| 572 | struct mdio_device *mdio = to_mdio_device(dev); |
| 573 | |
| 574 | if (mdio->pm_ops && mdio->pm_ops->suspend) |
| 575 | return mdio->pm_ops->suspend(dev); |
| 576 | |
| 577 | return 0; |
| 578 | } |
| 579 | |
| 580 | static int mdio_bus_resume(struct device *dev) |
| 581 | { |
| 582 | struct mdio_device *mdio = to_mdio_device(dev); |
| 583 | |
| 584 | if (mdio->pm_ops && mdio->pm_ops->resume) |
| 585 | return mdio->pm_ops->resume(dev); |
| 586 | |
| 587 | return 0; |
| 588 | } |
| 589 | |
| 590 | static int mdio_bus_restore(struct device *dev) |
| 591 | { |
| 592 | struct mdio_device *mdio = to_mdio_device(dev); |
| 593 | |
| 594 | if (mdio->pm_ops && mdio->pm_ops->restore) |
| 595 | return mdio->pm_ops->restore(dev); |
| 596 | |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | static const struct dev_pm_ops mdio_bus_pm_ops = { |
| 601 | .suspend = mdio_bus_suspend, |
| 602 | .resume = mdio_bus_resume, |
| 603 | .freeze = mdio_bus_suspend, |
| 604 | .thaw = mdio_bus_resume, |
| 605 | .restore = mdio_bus_restore, |
| 606 | }; |
| 607 | |
| 608 | #define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops) |
| 609 | |
| 610 | #else |
| 611 | |
| 612 | #define MDIO_BUS_PM_OPS NULL |
| 613 | |
| 614 | #endif /* CONFIG_PM */ |
| 615 | |
| 616 | struct bus_type mdio_bus_type = { |
| 617 | .name = "mdio_bus", |
| 618 | .match = mdio_bus_match, |
| 619 | .pm = MDIO_BUS_PM_OPS, |
| 620 | }; |
| 621 | EXPORT_SYMBOL(mdio_bus_type); |
| 622 | |
| 623 | int __init mdio_bus_init(void) |
| 624 | { |
| 625 | int ret; |
| 626 | |
| 627 | ret = class_register(&mdio_bus_class); |
| 628 | if (!ret) { |
| 629 | ret = bus_register(&mdio_bus_type); |
| 630 | if (ret) |
| 631 | class_unregister(&mdio_bus_class); |
| 632 | } |
| 633 | |
| 634 | return ret; |
| 635 | } |
| 636 | |
| 637 | void mdio_bus_exit(void) |
| 638 | { |
| 639 | class_unregister(&mdio_bus_class); |
| 640 | bus_unregister(&mdio_bus_type); |
| 641 | } |