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1// SPDX-License-Identifier: GPL-2.0+2/* MDIO Bus interface3 *4 * Author: Andy Fleming5 *6 * Copyright (c) 2004 Freescale Semiconductor, Inc.7 */8 9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt10 11#include <linux/delay.h>12#include <linux/device.h>13#include <linux/errno.h>14#include <linux/etherdevice.h>15#include <linux/ethtool.h>16#include <linux/gpio/consumer.h>17#include <linux/init.h>18#include <linux/interrupt.h>19#include <linux/io.h>20#include <linux/kernel.h>21#include <linux/micrel_phy.h>22#include <linux/mii.h>23#include <linux/mm.h>24#include <linux/module.h>25#include <linux/netdevice.h>26#include <linux/of_device.h>27#include <linux/of_mdio.h>28#include <linux/phy.h>29#include <linux/reset.h>30#include <linux/skbuff.h>31#include <linux/slab.h>32#include <linux/spinlock.h>33#include <linux/string.h>34#include <linux/uaccess.h>35#include <linux/unistd.h>36 37#define CREATE_TRACE_POINTS38#include <trace/events/mdio.h>39 40#include "mdio-boardinfo.h"41 42static int mdiobus_register_gpiod(struct mdio_device *mdiodev)43{44 /* Deassert the optional reset signal */45 mdiodev->reset_gpio = gpiod_get_optional(&mdiodev->dev,46 "reset", GPIOD_OUT_LOW);47 if (IS_ERR(mdiodev->reset_gpio))48 return PTR_ERR(mdiodev->reset_gpio);49 50 if (mdiodev->reset_gpio)51 gpiod_set_consumer_name(mdiodev->reset_gpio, "PHY reset");52 53 return 0;54}55 56static int mdiobus_register_reset(struct mdio_device *mdiodev)57{58 struct reset_control *reset;59 60 reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");61 if (IS_ERR(reset))62 return PTR_ERR(reset);63 64 mdiodev->reset_ctrl = reset;65 66 return 0;67}68 69int mdiobus_register_device(struct mdio_device *mdiodev)70{71 int err;72 73 if (mdiodev->bus->mdio_map[mdiodev->addr])74 return -EBUSY;75 76 if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY) {77 err = mdiobus_register_gpiod(mdiodev);78 if (err)79 return err;80 81 err = mdiobus_register_reset(mdiodev);82 if (err)83 return err;84 85 /* Assert the reset signal */86 mdio_device_reset(mdiodev, 1);87 }88 89 mdiodev->bus->mdio_map[mdiodev->addr] = mdiodev;90 91 return 0;92}93EXPORT_SYMBOL(mdiobus_register_device);94 95int mdiobus_unregister_device(struct mdio_device *mdiodev)96{97 if (mdiodev->bus->mdio_map[mdiodev->addr] != mdiodev)98 return -EINVAL;99 100 reset_control_put(mdiodev->reset_ctrl);101 102 mdiodev->bus->mdio_map[mdiodev->addr] = NULL;103 104 return 0;105}106EXPORT_SYMBOL(mdiobus_unregister_device);107 108static struct mdio_device *mdiobus_find_device(struct mii_bus *bus, int addr)109{110 bool addr_valid = addr >= 0 && addr < ARRAY_SIZE(bus->mdio_map);111 112 if (WARN_ONCE(!addr_valid, "addr %d out of range\n", addr))113 return NULL;114 115 return bus->mdio_map[addr];116}117 118struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)119{120 struct mdio_device *mdiodev;121 122 mdiodev = mdiobus_find_device(bus, addr);123 if (!mdiodev)124 return NULL;125 126 if (!(mdiodev->flags & MDIO_DEVICE_FLAG_PHY))127 return NULL;128 129 return container_of(mdiodev, struct phy_device, mdio);130}131EXPORT_SYMBOL(mdiobus_get_phy);132 133bool mdiobus_is_registered_device(struct mii_bus *bus, int addr)134{135 return mdiobus_find_device(bus, addr) != NULL;136}137EXPORT_SYMBOL(mdiobus_is_registered_device);138 139/**140 * mdiobus_alloc_size - allocate a mii_bus structure141 * @size: extra amount of memory to allocate for private storage.142 * If non-zero, then bus->priv is points to that memory.143 *144 * Description: called by a bus driver to allocate an mii_bus145 * structure to fill in.146 */147struct mii_bus *mdiobus_alloc_size(size_t size)148{149 struct mii_bus *bus;150 size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);151 size_t alloc_size;152 int i;153 154 /* If we alloc extra space, it should be aligned */155 if (size)156 alloc_size = aligned_size + size;157 else158 alloc_size = sizeof(*bus);159 160 bus = kzalloc(alloc_size, GFP_KERNEL);161 if (!bus)162 return NULL;163 164 bus->state = MDIOBUS_ALLOCATED;165 if (size)166 bus->priv = (void *)bus + aligned_size;167 168 /* Initialise the interrupts to polling and 64-bit seqcounts */169 for (i = 0; i < PHY_MAX_ADDR; i++) {170 bus->irq[i] = PHY_POLL;171 u64_stats_init(&bus->stats[i].syncp);172 }173 174 return bus;175}176EXPORT_SYMBOL(mdiobus_alloc_size);177 178/**179 * mdiobus_release - mii_bus device release callback180 * @d: the target struct device that contains the mii_bus181 *182 * Description: called when the last reference to an mii_bus is183 * dropped, to free the underlying memory.184 */185static void mdiobus_release(struct device *d)186{187 struct mii_bus *bus = to_mii_bus(d);188 189 WARN(bus->state != MDIOBUS_RELEASED &&190 /* for compatibility with error handling in drivers */191 bus->state != MDIOBUS_ALLOCATED,192 "%s: not in RELEASED or ALLOCATED state\n",193 bus->id);194 195 if (bus->state == MDIOBUS_RELEASED)196 fwnode_handle_put(dev_fwnode(d));197 198 kfree(bus);199}200 201struct mdio_bus_stat_attr {202 int addr;203 unsigned int field_offset;204};205 206static u64 mdio_bus_get_stat(struct mdio_bus_stats *s, unsigned int offset)207{208 const char *p = (const char *)s + offset;209 unsigned int start;210 u64 val = 0;211 212 do {213 start = u64_stats_fetch_begin(&s->syncp);214 val = u64_stats_read((const u64_stats_t *)p);215 } while (u64_stats_fetch_retry(&s->syncp, start));216 217 return val;218}219 220static u64 mdio_bus_get_global_stat(struct mii_bus *bus, unsigned int offset)221{222 unsigned int i;223 u64 val = 0;224 225 for (i = 0; i < PHY_MAX_ADDR; i++)226 val += mdio_bus_get_stat(&bus->stats[i], offset);227 228 return val;229}230 231static ssize_t mdio_bus_stat_field_show(struct device *dev,232 struct device_attribute *attr,233 char *buf)234{235 struct mii_bus *bus = to_mii_bus(dev);236 struct mdio_bus_stat_attr *sattr;237 struct dev_ext_attribute *eattr;238 u64 val;239 240 eattr = container_of(attr, struct dev_ext_attribute, attr);241 sattr = eattr->var;242 243 if (sattr->addr < 0)244 val = mdio_bus_get_global_stat(bus, sattr->field_offset);245 else246 val = mdio_bus_get_stat(&bus->stats[sattr->addr],247 sattr->field_offset);248 249 return sysfs_emit(buf, "%llu\n", val);250}251 252static ssize_t mdio_bus_device_stat_field_show(struct device *dev,253 struct device_attribute *attr,254 char *buf)255{256 struct mdio_device *mdiodev = to_mdio_device(dev);257 struct mii_bus *bus = mdiodev->bus;258 struct mdio_bus_stat_attr *sattr;259 struct dev_ext_attribute *eattr;260 int addr = mdiodev->addr;261 u64 val;262 263 eattr = container_of(attr, struct dev_ext_attribute, attr);264 sattr = eattr->var;265 266 val = mdio_bus_get_stat(&bus->stats[addr], sattr->field_offset);267 268 return sysfs_emit(buf, "%llu\n", val);269}270 271#define MDIO_BUS_STATS_ATTR_DECL(field, file) \272static struct dev_ext_attribute dev_attr_mdio_bus_##field = { \273 .attr = { .attr = { .name = file, .mode = 0444 }, \274 .show = mdio_bus_stat_field_show, \275 }, \276 .var = &((struct mdio_bus_stat_attr) { \277 -1, offsetof(struct mdio_bus_stats, field) \278 }), \279}; \280static struct dev_ext_attribute dev_attr_mdio_bus_device_##field = { \281 .attr = { .attr = { .name = file, .mode = 0444 }, \282 .show = mdio_bus_device_stat_field_show, \283 }, \284 .var = &((struct mdio_bus_stat_attr) { \285 -1, offsetof(struct mdio_bus_stats, field) \286 }), \287};288 289#define MDIO_BUS_STATS_ATTR(field) \290 MDIO_BUS_STATS_ATTR_DECL(field, __stringify(field))291 292MDIO_BUS_STATS_ATTR(transfers);293MDIO_BUS_STATS_ATTR(errors);294MDIO_BUS_STATS_ATTR(writes);295MDIO_BUS_STATS_ATTR(reads);296 297#define MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, file) \298static struct dev_ext_attribute dev_attr_mdio_bus_addr_##field##_##addr = { \299 .attr = { .attr = { .name = file, .mode = 0444 }, \300 .show = mdio_bus_stat_field_show, \301 }, \302 .var = &((struct mdio_bus_stat_attr) { \303 addr, offsetof(struct mdio_bus_stats, field) \304 }), \305}306 307#define MDIO_BUS_STATS_ADDR_ATTR(field, addr) \308 MDIO_BUS_STATS_ADDR_ATTR_DECL(field, addr, \309 __stringify(field) "_" __stringify(addr))310 311#define MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(addr) \312 MDIO_BUS_STATS_ADDR_ATTR(transfers, addr); \313 MDIO_BUS_STATS_ADDR_ATTR(errors, addr); \314 MDIO_BUS_STATS_ADDR_ATTR(writes, addr); \315 MDIO_BUS_STATS_ADDR_ATTR(reads, addr) \316 317MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(0);318MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(1);319MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(2);320MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(3);321MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(4);322MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(5);323MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(6);324MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(7);325MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(8);326MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(9);327MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(10);328MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(11);329MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(12);330MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(13);331MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(14);332MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(15);333MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(16);334MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(17);335MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(18);336MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(19);337MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(20);338MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(21);339MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(22);340MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(23);341MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(24);342MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(25);343MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(26);344MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(27);345MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(28);346MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(29);347MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(30);348MDIO_BUS_STATS_ADDR_ATTR_GROUP_DECL(31);349 350#define MDIO_BUS_STATS_ADDR_ATTR_GROUP(addr) \351 &dev_attr_mdio_bus_addr_transfers_##addr.attr.attr, \352 &dev_attr_mdio_bus_addr_errors_##addr.attr.attr, \353 &dev_attr_mdio_bus_addr_writes_##addr.attr.attr, \354 &dev_attr_mdio_bus_addr_reads_##addr.attr.attr \355 356static struct attribute *mdio_bus_statistics_attrs[] = {357 &dev_attr_mdio_bus_transfers.attr.attr,358 &dev_attr_mdio_bus_errors.attr.attr,359 &dev_attr_mdio_bus_writes.attr.attr,360 &dev_attr_mdio_bus_reads.attr.attr,361 MDIO_BUS_STATS_ADDR_ATTR_GROUP(0),362 MDIO_BUS_STATS_ADDR_ATTR_GROUP(1),363 MDIO_BUS_STATS_ADDR_ATTR_GROUP(2),364 MDIO_BUS_STATS_ADDR_ATTR_GROUP(3),365 MDIO_BUS_STATS_ADDR_ATTR_GROUP(4),366 MDIO_BUS_STATS_ADDR_ATTR_GROUP(5),367 MDIO_BUS_STATS_ADDR_ATTR_GROUP(6),368 MDIO_BUS_STATS_ADDR_ATTR_GROUP(7),369 MDIO_BUS_STATS_ADDR_ATTR_GROUP(8),370 MDIO_BUS_STATS_ADDR_ATTR_GROUP(9),371 MDIO_BUS_STATS_ADDR_ATTR_GROUP(10),372 MDIO_BUS_STATS_ADDR_ATTR_GROUP(11),373 MDIO_BUS_STATS_ADDR_ATTR_GROUP(12),374 MDIO_BUS_STATS_ADDR_ATTR_GROUP(13),375 MDIO_BUS_STATS_ADDR_ATTR_GROUP(14),376 MDIO_BUS_STATS_ADDR_ATTR_GROUP(15),377 MDIO_BUS_STATS_ADDR_ATTR_GROUP(16),378 MDIO_BUS_STATS_ADDR_ATTR_GROUP(17),379 MDIO_BUS_STATS_ADDR_ATTR_GROUP(18),380 MDIO_BUS_STATS_ADDR_ATTR_GROUP(19),381 MDIO_BUS_STATS_ADDR_ATTR_GROUP(20),382 MDIO_BUS_STATS_ADDR_ATTR_GROUP(21),383 MDIO_BUS_STATS_ADDR_ATTR_GROUP(22),384 MDIO_BUS_STATS_ADDR_ATTR_GROUP(23),385 MDIO_BUS_STATS_ADDR_ATTR_GROUP(24),386 MDIO_BUS_STATS_ADDR_ATTR_GROUP(25),387 MDIO_BUS_STATS_ADDR_ATTR_GROUP(26),388 MDIO_BUS_STATS_ADDR_ATTR_GROUP(27),389 MDIO_BUS_STATS_ADDR_ATTR_GROUP(28),390 MDIO_BUS_STATS_ADDR_ATTR_GROUP(29),391 MDIO_BUS_STATS_ADDR_ATTR_GROUP(30),392 MDIO_BUS_STATS_ADDR_ATTR_GROUP(31),393 NULL,394};395 396static const struct attribute_group mdio_bus_statistics_group = {397 .name = "statistics",398 .attrs = mdio_bus_statistics_attrs,399};400 401static const struct attribute_group *mdio_bus_groups[] = {402 &mdio_bus_statistics_group,403 NULL,404};405 406static struct class mdio_bus_class = {407 .name = "mdio_bus",408 .dev_release = mdiobus_release,409 .dev_groups = mdio_bus_groups,410};411 412/**413 * mdio_find_bus - Given the name of a mdiobus, find the mii_bus.414 * @mdio_name: The name of a mdiobus.415 *416 * Returns a reference to the mii_bus, or NULL if none found. The417 * embedded struct device will have its reference count incremented,418 * and this must be put_deviced'ed once the bus is finished with.419 */420struct mii_bus *mdio_find_bus(const char *mdio_name)421{422 struct device *d;423 424 d = class_find_device_by_name(&mdio_bus_class, mdio_name);425 return d ? to_mii_bus(d) : NULL;426}427EXPORT_SYMBOL(mdio_find_bus);428 429#if IS_ENABLED(CONFIG_OF_MDIO)430/**431 * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.432 * @mdio_bus_np: Pointer to the mii_bus.433 *434 * Returns a reference to the mii_bus, or NULL if none found. The435 * embedded struct device will have its reference count incremented,436 * and this must be put once the bus is finished with.437 *438 * Because the association of a device_node and mii_bus is made via439 * of_mdiobus_register(), the mii_bus cannot be found before it is440 * registered with of_mdiobus_register().441 *442 */443struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)444{445 struct device *d;446 447 if (!mdio_bus_np)448 return NULL;449 450 d = class_find_device_by_of_node(&mdio_bus_class, mdio_bus_np);451 return d ? to_mii_bus(d) : NULL;452}453EXPORT_SYMBOL(of_mdio_find_bus);454 455/* Walk the list of subnodes of a mdio bus and look for a node that456 * matches the mdio device's address with its 'reg' property. If457 * found, set the of_node pointer for the mdio device. This allows458 * auto-probed phy devices to be supplied with information passed in459 * via DT.460 * If a PHY package is found, PHY is searched also there.461 */462static int of_mdiobus_find_phy(struct device *dev, struct mdio_device *mdiodev,463 struct device_node *np)464{465 struct device_node *child;466 467 for_each_available_child_of_node(np, child) {468 int addr;469 470 if (of_node_name_eq(child, "ethernet-phy-package")) {471 /* Validate PHY package reg presence */472 if (!of_property_present(child, "reg")) {473 of_node_put(child);474 return -EINVAL;475 }476 477 if (!of_mdiobus_find_phy(dev, mdiodev, child)) {478 /* The refcount for the PHY package will be479 * incremented later when PHY join the Package.480 */481 of_node_put(child);482 return 0;483 }484 485 continue;486 }487 488 addr = of_mdio_parse_addr(dev, child);489 if (addr < 0)490 continue;491 492 if (addr == mdiodev->addr) {493 device_set_node(dev, of_fwnode_handle(child));494 /* The refcount on "child" is passed to the mdio495 * device. Do _not_ use of_node_put(child) here.496 */497 return 0;498 }499 }500 501 return -ENODEV;502}503 504static void of_mdiobus_link_mdiodev(struct mii_bus *bus,505 struct mdio_device *mdiodev)506{507 struct device *dev = &mdiodev->dev;508 509 if (dev->of_node || !bus->dev.of_node)510 return;511 512 of_mdiobus_find_phy(dev, mdiodev, bus->dev.of_node);513}514#else /* !IS_ENABLED(CONFIG_OF_MDIO) */515static inline void of_mdiobus_link_mdiodev(struct mii_bus *mdio,516 struct mdio_device *mdiodev)517{518}519#endif520 521/**522 * mdiobus_create_device - create a full MDIO device given523 * a mdio_board_info structure524 * @bus: MDIO bus to create the devices on525 * @bi: mdio_board_info structure describing the devices526 *527 * Returns 0 on success or < 0 on error.528 */529static int mdiobus_create_device(struct mii_bus *bus,530 struct mdio_board_info *bi)531{532 struct mdio_device *mdiodev;533 int ret = 0;534 535 mdiodev = mdio_device_create(bus, bi->mdio_addr);536 if (IS_ERR(mdiodev))537 return -ENODEV;538 539 strscpy(mdiodev->modalias, bi->modalias,540 sizeof(mdiodev->modalias));541 mdiodev->bus_match = mdio_device_bus_match;542 mdiodev->dev.platform_data = (void *)bi->platform_data;543 544 ret = mdio_device_register(mdiodev);545 if (ret)546 mdio_device_free(mdiodev);547 548 return ret;549}550 551static struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr, bool c45)552{553 struct phy_device *phydev = ERR_PTR(-ENODEV);554 int err;555 556 phydev = get_phy_device(bus, addr, c45);557 if (IS_ERR(phydev))558 return phydev;559 560 /* For DT, see if the auto-probed phy has a corresponding child561 * in the bus node, and set the of_node pointer in this case.562 */563 of_mdiobus_link_mdiodev(bus, &phydev->mdio);564 565 err = phy_device_register(phydev);566 if (err) {567 phy_device_free(phydev);568 return ERR_PTR(-ENODEV);569 }570 571 return phydev;572}573 574/**575 * mdiobus_scan_c22 - scan one address on a bus for C22 MDIO devices.576 * @bus: mii_bus to scan577 * @addr: address on bus to scan578 *579 * This function scans one address on the MDIO bus, looking for580 * devices which can be identified using a vendor/product ID in581 * registers 2 and 3. Not all MDIO devices have such registers, but582 * PHY devices typically do. Hence this function assumes anything583 * found is a PHY, or can be treated as a PHY. Other MDIO devices,584 * such as switches, will probably not be found during the scan.585 */586struct phy_device *mdiobus_scan_c22(struct mii_bus *bus, int addr)587{588 return mdiobus_scan(bus, addr, false);589}590EXPORT_SYMBOL(mdiobus_scan_c22);591 592/**593 * mdiobus_scan_c45 - scan one address on a bus for C45 MDIO devices.594 * @bus: mii_bus to scan595 * @addr: address on bus to scan596 *597 * This function scans one address on the MDIO bus, looking for598 * devices which can be identified using a vendor/product ID in599 * registers 2 and 3. Not all MDIO devices have such registers, but600 * PHY devices typically do. Hence this function assumes anything601 * found is a PHY, or can be treated as a PHY. Other MDIO devices,602 * such as switches, will probably not be found during the scan.603 */604static struct phy_device *mdiobus_scan_c45(struct mii_bus *bus, int addr)605{606 return mdiobus_scan(bus, addr, true);607}608 609static int mdiobus_scan_bus_c22(struct mii_bus *bus)610{611 int i;612 613 for (i = 0; i < PHY_MAX_ADDR; i++) {614 if ((bus->phy_mask & BIT(i)) == 0) {615 struct phy_device *phydev;616 617 phydev = mdiobus_scan_c22(bus, i);618 if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV))619 return PTR_ERR(phydev);620 }621 }622 return 0;623}624 625static int mdiobus_scan_bus_c45(struct mii_bus *bus)626{627 int i;628 629 for (i = 0; i < PHY_MAX_ADDR; i++) {630 if ((bus->phy_mask & BIT(i)) == 0) {631 struct phy_device *phydev;632 633 /* Don't scan C45 if we already have a C22 device */634 if (bus->mdio_map[i])635 continue;636 637 phydev = mdiobus_scan_c45(bus, i);638 if (IS_ERR(phydev) && (PTR_ERR(phydev) != -ENODEV))639 return PTR_ERR(phydev);640 }641 }642 return 0;643}644 645/* There are some C22 PHYs which do bad things when where is a C45646 * transaction on the bus, like accepting a read themselves, and647 * stomping over the true devices reply, to performing a write to648 * themselves which was intended for another device. Now that C22649 * devices have been found, see if any of them are bad for C45, and if we650 * should skip the C45 scan.651 */652static bool mdiobus_prevent_c45_scan(struct mii_bus *bus)653{654 int i;655 656 for (i = 0; i < PHY_MAX_ADDR; i++) {657 struct phy_device *phydev;658 u32 oui;659 660 phydev = mdiobus_get_phy(bus, i);661 if (!phydev)662 continue;663 oui = phydev->phy_id >> 10;664 665 if (oui == MICREL_OUI)666 return true;667 }668 return false;669}670 671/**672 * __mdiobus_register - bring up all the PHYs on a given bus and attach them to bus673 * @bus: target mii_bus674 * @owner: module containing bus accessor functions675 *676 * Description: Called by a bus driver to bring up all the PHYs677 * on a given bus, and attach them to the bus. Drivers should use678 * mdiobus_register() rather than __mdiobus_register() unless they679 * need to pass a specific owner module. MDIO devices which are not680 * PHYs will not be brought up by this function. They are expected681 * to be explicitly listed in DT and instantiated by of_mdiobus_register().682 *683 * Returns 0 on success or < 0 on error.684 */685int __mdiobus_register(struct mii_bus *bus, struct module *owner)686{687 struct mdio_device *mdiodev;688 struct gpio_desc *gpiod;689 bool prevent_c45_scan;690 int i, err;691 692 if (!bus || !bus->name)693 return -EINVAL;694 695 /* An access method always needs both read and write operations */696 if (!!bus->read != !!bus->write || !!bus->read_c45 != !!bus->write_c45)697 return -EINVAL;698 699 /* At least one method is mandatory */700 if (!bus->read && !bus->read_c45)701 return -EINVAL;702 703 if (bus->parent && bus->parent->of_node)704 bus->parent->of_node->fwnode.flags |=705 FWNODE_FLAG_NEEDS_CHILD_BOUND_ON_ADD;706 707 WARN(bus->state != MDIOBUS_ALLOCATED &&708 bus->state != MDIOBUS_UNREGISTERED,709 "%s: not in ALLOCATED or UNREGISTERED state\n", bus->id);710 711 bus->owner = owner;712 bus->dev.parent = bus->parent;713 bus->dev.class = &mdio_bus_class;714 bus->dev.groups = NULL;715 dev_set_name(&bus->dev, "%s", bus->id);716 717 /* If the bus state is allocated, we're registering a fresh bus718 * that may have a fwnode associated with it. Grab a reference719 * to the fwnode. This will be dropped when the bus is released.720 * If the bus was set to unregistered, it means that the bus was721 * previously registered, and we've already grabbed a reference.722 */723 if (bus->state == MDIOBUS_ALLOCATED)724 fwnode_handle_get(dev_fwnode(&bus->dev));725 726 /* We need to set state to MDIOBUS_UNREGISTERED to correctly release727 * the device in mdiobus_free()728 *729 * State will be updated later in this function in case of success730 */731 bus->state = MDIOBUS_UNREGISTERED;732 733 err = device_register(&bus->dev);734 if (err) {735 pr_err("mii_bus %s failed to register\n", bus->id);736 return -EINVAL;737 }738 739 mutex_init(&bus->mdio_lock);740 mutex_init(&bus->shared_lock);741 742 /* assert bus level PHY GPIO reset */743 gpiod = devm_gpiod_get_optional(&bus->dev, "reset", GPIOD_OUT_HIGH);744 if (IS_ERR(gpiod)) {745 err = dev_err_probe(&bus->dev, PTR_ERR(gpiod),746 "mii_bus %s couldn't get reset GPIO\n",747 bus->id);748 device_del(&bus->dev);749 return err;750 } else if (gpiod) {751 bus->reset_gpiod = gpiod;752 fsleep(bus->reset_delay_us);753 gpiod_set_value_cansleep(gpiod, 0);754 if (bus->reset_post_delay_us > 0)755 fsleep(bus->reset_post_delay_us);756 }757 758 if (bus->reset) {759 err = bus->reset(bus);760 if (err)761 goto error_reset_gpiod;762 }763 764 if (bus->read) {765 err = mdiobus_scan_bus_c22(bus);766 if (err)767 goto error;768 }769 770 prevent_c45_scan = mdiobus_prevent_c45_scan(bus);771 772 if (!prevent_c45_scan && bus->read_c45) {773 err = mdiobus_scan_bus_c45(bus);774 if (err)775 goto error;776 }777 778 mdiobus_setup_mdiodev_from_board_info(bus, mdiobus_create_device);779 780 bus->state = MDIOBUS_REGISTERED;781 dev_dbg(&bus->dev, "probed\n");782 return 0;783 784error:785 for (i = 0; i < PHY_MAX_ADDR; i++) {786 mdiodev = bus->mdio_map[i];787 if (!mdiodev)788 continue;789 790 mdiodev->device_remove(mdiodev);791 mdiodev->device_free(mdiodev);792 }793error_reset_gpiod:794 /* Put PHYs in RESET to save power */795 if (bus->reset_gpiod)796 gpiod_set_value_cansleep(bus->reset_gpiod, 1);797 798 device_del(&bus->dev);799 return err;800}801EXPORT_SYMBOL(__mdiobus_register);802 803void mdiobus_unregister(struct mii_bus *bus)804{805 struct mdio_device *mdiodev;806 int i;807 808 if (WARN_ON_ONCE(bus->state != MDIOBUS_REGISTERED))809 return;810 bus->state = MDIOBUS_UNREGISTERED;811 812 for (i = 0; i < PHY_MAX_ADDR; i++) {813 mdiodev = bus->mdio_map[i];814 if (!mdiodev)815 continue;816 817 if (mdiodev->reset_gpio)818 gpiod_put(mdiodev->reset_gpio);819 820 mdiodev->device_remove(mdiodev);821 mdiodev->device_free(mdiodev);822 }823 824 /* Put PHYs in RESET to save power */825 if (bus->reset_gpiod)826 gpiod_set_value_cansleep(bus->reset_gpiod, 1);827 828 device_del(&bus->dev);829}830EXPORT_SYMBOL(mdiobus_unregister);831 832/**833 * mdiobus_free - free a struct mii_bus834 * @bus: mii_bus to free835 *836 * This function releases the reference to the underlying device837 * object in the mii_bus. If this is the last reference, the mii_bus838 * will be freed.839 */840void mdiobus_free(struct mii_bus *bus)841{842 /* For compatibility with error handling in drivers. */843 if (bus->state == MDIOBUS_ALLOCATED) {844 kfree(bus);845 return;846 }847 848 WARN(bus->state != MDIOBUS_UNREGISTERED,849 "%s: not in UNREGISTERED state\n", bus->id);850 bus->state = MDIOBUS_RELEASED;851 852 put_device(&bus->dev);853}854EXPORT_SYMBOL(mdiobus_free);855 856static void mdiobus_stats_acct(struct mdio_bus_stats *stats, bool op, int ret)857{858 preempt_disable();859 u64_stats_update_begin(&stats->syncp);860 861 u64_stats_inc(&stats->transfers);862 if (ret < 0) {863 u64_stats_inc(&stats->errors);864 goto out;865 }866 867 if (op)868 u64_stats_inc(&stats->reads);869 else870 u64_stats_inc(&stats->writes);871out:872 u64_stats_update_end(&stats->syncp);873 preempt_enable();874}875 876/**877 * __mdiobus_read - Unlocked version of the mdiobus_read function878 * @bus: the mii_bus struct879 * @addr: the phy address880 * @regnum: register number to read881 *882 * Read a MDIO bus register. Caller must hold the mdio bus lock.883 *884 * NOTE: MUST NOT be called from interrupt context.885 */886int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)887{888 int retval;889 890 lockdep_assert_held_once(&bus->mdio_lock);891 892 if (bus->read)893 retval = bus->read(bus, addr, regnum);894 else895 retval = -EOPNOTSUPP;896 897 trace_mdio_access(bus, 1, addr, regnum, retval, retval);898 mdiobus_stats_acct(&bus->stats[addr], true, retval);899 900 return retval;901}902EXPORT_SYMBOL(__mdiobus_read);903 904/**905 * __mdiobus_write - Unlocked version of the mdiobus_write function906 * @bus: the mii_bus struct907 * @addr: the phy address908 * @regnum: register number to write909 * @val: value to write to @regnum910 *911 * Write a MDIO bus register. Caller must hold the mdio bus lock.912 *913 * NOTE: MUST NOT be called from interrupt context.914 */915int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)916{917 int err;918 919 lockdep_assert_held_once(&bus->mdio_lock);920 921 if (bus->write)922 err = bus->write(bus, addr, regnum, val);923 else924 err = -EOPNOTSUPP;925 926 trace_mdio_access(bus, 0, addr, regnum, val, err);927 mdiobus_stats_acct(&bus->stats[addr], false, err);928 929 return err;930}931EXPORT_SYMBOL(__mdiobus_write);932 933/**934 * __mdiobus_modify_changed - Unlocked version of the mdiobus_modify function935 * @bus: the mii_bus struct936 * @addr: the phy address937 * @regnum: register number to modify938 * @mask: bit mask of bits to clear939 * @set: bit mask of bits to set940 *941 * Read, modify, and if any change, write the register value back to the942 * device. Any error returns a negative number.943 *944 * NOTE: MUST NOT be called from interrupt context.945 */946int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,947 u16 mask, u16 set)948{949 int new, ret;950 951 ret = __mdiobus_read(bus, addr, regnum);952 if (ret < 0)953 return ret;954 955 new = (ret & ~mask) | set;956 if (new == ret)957 return 0;958 959 ret = __mdiobus_write(bus, addr, regnum, new);960 961 return ret < 0 ? ret : 1;962}963EXPORT_SYMBOL_GPL(__mdiobus_modify_changed);964 965/**966 * __mdiobus_c45_read - Unlocked version of the mdiobus_c45_read function967 * @bus: the mii_bus struct968 * @addr: the phy address969 * @devad: device address to read970 * @regnum: register number to read971 *972 * Read a MDIO bus register. Caller must hold the mdio bus lock.973 *974 * NOTE: MUST NOT be called from interrupt context.975 */976int __mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum)977{978 int retval;979 980 lockdep_assert_held_once(&bus->mdio_lock);981 982 if (bus->read_c45)983 retval = bus->read_c45(bus, addr, devad, regnum);984 else985 retval = -EOPNOTSUPP;986 987 trace_mdio_access(bus, 1, addr, regnum, retval, retval);988 mdiobus_stats_acct(&bus->stats[addr], true, retval);989 990 return retval;991}992EXPORT_SYMBOL(__mdiobus_c45_read);993 994/**995 * __mdiobus_c45_write - Unlocked version of the mdiobus_write function996 * @bus: the mii_bus struct997 * @addr: the phy address998 * @devad: device address to read999 * @regnum: register number to write1000 * @val: value to write to @regnum1001 *1002 * Write a MDIO bus register. Caller must hold the mdio bus lock.1003 *1004 * NOTE: MUST NOT be called from interrupt context.1005 */1006int __mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum,1007 u16 val)1008{1009 int err;1010 1011 lockdep_assert_held_once(&bus->mdio_lock);1012 1013 if (bus->write_c45)1014 err = bus->write_c45(bus, addr, devad, regnum, val);1015 else1016 err = -EOPNOTSUPP;1017 1018 trace_mdio_access(bus, 0, addr, regnum, val, err);1019 mdiobus_stats_acct(&bus->stats[addr], false, err);1020 1021 return err;1022}1023EXPORT_SYMBOL(__mdiobus_c45_write);1024 1025/**1026 * __mdiobus_c45_modify_changed - Unlocked version of the mdiobus_modify function1027 * @bus: the mii_bus struct1028 * @addr: the phy address1029 * @devad: device address to read1030 * @regnum: register number to modify1031 * @mask: bit mask of bits to clear1032 * @set: bit mask of bits to set1033 *1034 * Read, modify, and if any change, write the register value back to the1035 * device. Any error returns a negative number.1036 *1037 * NOTE: MUST NOT be called from interrupt context.1038 */1039static int __mdiobus_c45_modify_changed(struct mii_bus *bus, int addr,1040 int devad, u32 regnum, u16 mask,1041 u16 set)1042{1043 int new, ret;1044 1045 ret = __mdiobus_c45_read(bus, addr, devad, regnum);1046 if (ret < 0)1047 return ret;1048 1049 new = (ret & ~mask) | set;1050 if (new == ret)1051 return 0;1052 1053 ret = __mdiobus_c45_write(bus, addr, devad, regnum, new);1054 1055 return ret < 0 ? ret : 1;1056}1057 1058/**1059 * mdiobus_read_nested - Nested version of the mdiobus_read function1060 * @bus: the mii_bus struct1061 * @addr: the phy address1062 * @regnum: register number to read1063 *1064 * In case of nested MDIO bus access avoid lockdep false positives by1065 * using mutex_lock_nested().1066 *1067 * NOTE: MUST NOT be called from interrupt context,1068 * because the bus read/write functions may wait for an interrupt1069 * to conclude the operation.1070 */1071int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum)1072{1073 int retval;1074 1075 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);1076 retval = __mdiobus_read(bus, addr, regnum);1077 mutex_unlock(&bus->mdio_lock);1078 1079 return retval;1080}1081EXPORT_SYMBOL(mdiobus_read_nested);1082 1083/**1084 * mdiobus_read - Convenience function for reading a given MII mgmt register1085 * @bus: the mii_bus struct1086 * @addr: the phy address1087 * @regnum: register number to read1088 *1089 * NOTE: MUST NOT be called from interrupt context,1090 * because the bus read/write functions may wait for an interrupt1091 * to conclude the operation.1092 */1093int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)1094{1095 int retval;1096 1097 mutex_lock(&bus->mdio_lock);1098 retval = __mdiobus_read(bus, addr, regnum);1099 mutex_unlock(&bus->mdio_lock);1100 1101 return retval;1102}1103EXPORT_SYMBOL(mdiobus_read);1104 1105/**1106 * mdiobus_c45_read - Convenience function for reading a given MII mgmt register1107 * @bus: the mii_bus struct1108 * @addr: the phy address1109 * @devad: device address to read1110 * @regnum: register number to read1111 *1112 * NOTE: MUST NOT be called from interrupt context,1113 * because the bus read/write functions may wait for an interrupt1114 * to conclude the operation.1115 */1116int mdiobus_c45_read(struct mii_bus *bus, int addr, int devad, u32 regnum)1117{1118 int retval;1119 1120 mutex_lock(&bus->mdio_lock);1121 retval = __mdiobus_c45_read(bus, addr, devad, regnum);1122 mutex_unlock(&bus->mdio_lock);1123 1124 return retval;1125}1126EXPORT_SYMBOL(mdiobus_c45_read);1127 1128/**1129 * mdiobus_c45_read_nested - Nested version of the mdiobus_c45_read function1130 * @bus: the mii_bus struct1131 * @addr: the phy address1132 * @devad: device address to read1133 * @regnum: register number to read1134 *1135 * In case of nested MDIO bus access avoid lockdep false positives by1136 * using mutex_lock_nested().1137 *1138 * NOTE: MUST NOT be called from interrupt context,1139 * because the bus read/write functions may wait for an interrupt1140 * to conclude the operation.1141 */1142int mdiobus_c45_read_nested(struct mii_bus *bus, int addr, int devad,1143 u32 regnum)1144{1145 int retval;1146 1147 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);1148 retval = __mdiobus_c45_read(bus, addr, devad, regnum);1149 mutex_unlock(&bus->mdio_lock);1150 1151 return retval;1152}1153EXPORT_SYMBOL(mdiobus_c45_read_nested);1154 1155/**1156 * mdiobus_write_nested - Nested version of the mdiobus_write function1157 * @bus: the mii_bus struct1158 * @addr: the phy address1159 * @regnum: register number to write1160 * @val: value to write to @regnum1161 *1162 * In case of nested MDIO bus access avoid lockdep false positives by1163 * using mutex_lock_nested().1164 *1165 * NOTE: MUST NOT be called from interrupt context,1166 * because the bus read/write functions may wait for an interrupt1167 * to conclude the operation.1168 */1169int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val)1170{1171 int err;1172 1173 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);1174 err = __mdiobus_write(bus, addr, regnum, val);1175 mutex_unlock(&bus->mdio_lock);1176 1177 return err;1178}1179EXPORT_SYMBOL(mdiobus_write_nested);1180 1181/**1182 * mdiobus_write - Convenience function for writing a given MII mgmt register1183 * @bus: the mii_bus struct1184 * @addr: the phy address1185 * @regnum: register number to write1186 * @val: value to write to @regnum1187 *1188 * NOTE: MUST NOT be called from interrupt context,1189 * because the bus read/write functions may wait for an interrupt1190 * to conclude the operation.1191 */1192int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)1193{1194 int err;1195 1196 mutex_lock(&bus->mdio_lock);1197 err = __mdiobus_write(bus, addr, regnum, val);1198 mutex_unlock(&bus->mdio_lock);1199 1200 return err;1201}1202EXPORT_SYMBOL(mdiobus_write);1203 1204/**1205 * mdiobus_c45_write - Convenience function for writing a given MII mgmt register1206 * @bus: the mii_bus struct1207 * @addr: the phy address1208 * @devad: device address to read1209 * @regnum: register number to write1210 * @val: value to write to @regnum1211 *1212 * NOTE: MUST NOT be called from interrupt context,1213 * because the bus read/write functions may wait for an interrupt1214 * to conclude the operation.1215 */1216int mdiobus_c45_write(struct mii_bus *bus, int addr, int devad, u32 regnum,1217 u16 val)1218{1219 int err;1220 1221 mutex_lock(&bus->mdio_lock);1222 err = __mdiobus_c45_write(bus, addr, devad, regnum, val);1223 mutex_unlock(&bus->mdio_lock);1224 1225 return err;1226}1227EXPORT_SYMBOL(mdiobus_c45_write);1228 1229/**1230 * mdiobus_c45_write_nested - Nested version of the mdiobus_c45_write function1231 * @bus: the mii_bus struct1232 * @addr: the phy address1233 * @devad: device address to read1234 * @regnum: register number to write1235 * @val: value to write to @regnum1236 *1237 * In case of nested MDIO bus access avoid lockdep false positives by1238 * using mutex_lock_nested().1239 *1240 * NOTE: MUST NOT be called from interrupt context,1241 * because the bus read/write functions may wait for an interrupt1242 * to conclude the operation.1243 */1244int mdiobus_c45_write_nested(struct mii_bus *bus, int addr, int devad,1245 u32 regnum, u16 val)1246{1247 int err;1248 1249 mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED);1250 err = __mdiobus_c45_write(bus, addr, devad, regnum, val);1251 mutex_unlock(&bus->mdio_lock);1252 1253 return err;1254}1255EXPORT_SYMBOL(mdiobus_c45_write_nested);1256 1257/*1258 * __mdiobus_modify - Convenience function for modifying a given mdio device1259 * register1260 * @bus: the mii_bus struct1261 * @addr: the phy address1262 * @regnum: register number to write1263 * @mask: bit mask of bits to clear1264 * @set: bit mask of bits to set1265 */1266int __mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,1267 u16 set)1268{1269 int err;1270 1271 err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);1272 1273 return err < 0 ? err : 0;1274}1275EXPORT_SYMBOL_GPL(__mdiobus_modify);1276 1277/**1278 * mdiobus_modify - Convenience function for modifying a given mdio device1279 * register1280 * @bus: the mii_bus struct1281 * @addr: the phy address1282 * @regnum: register number to write1283 * @mask: bit mask of bits to clear1284 * @set: bit mask of bits to set1285 */1286int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask, u16 set)1287{1288 int err;1289 1290 mutex_lock(&bus->mdio_lock);1291 err = __mdiobus_modify(bus, addr, regnum, mask, set);1292 mutex_unlock(&bus->mdio_lock);1293 1294 return err;1295}1296EXPORT_SYMBOL_GPL(mdiobus_modify);1297 1298/**1299 * mdiobus_c45_modify - Convenience function for modifying a given mdio device1300 * register1301 * @bus: the mii_bus struct1302 * @addr: the phy address1303 * @devad: device address to read1304 * @regnum: register number to write1305 * @mask: bit mask of bits to clear1306 * @set: bit mask of bits to set1307 */1308int mdiobus_c45_modify(struct mii_bus *bus, int addr, int devad, u32 regnum,1309 u16 mask, u16 set)1310{1311 int err;1312 1313 mutex_lock(&bus->mdio_lock);1314 err = __mdiobus_c45_modify_changed(bus, addr, devad, regnum,1315 mask, set);1316 mutex_unlock(&bus->mdio_lock);1317 1318 return err < 0 ? err : 0;1319}1320EXPORT_SYMBOL_GPL(mdiobus_c45_modify);1321 1322/**1323 * mdiobus_modify_changed - Convenience function for modifying a given mdio1324 * device register and returning if it changed1325 * @bus: the mii_bus struct1326 * @addr: the phy address1327 * @regnum: register number to write1328 * @mask: bit mask of bits to clear1329 * @set: bit mask of bits to set1330 */1331int mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,1332 u16 mask, u16 set)1333{1334 int err;1335 1336 mutex_lock(&bus->mdio_lock);1337 err = __mdiobus_modify_changed(bus, addr, regnum, mask, set);1338 mutex_unlock(&bus->mdio_lock);1339 1340 return err;1341}1342EXPORT_SYMBOL_GPL(mdiobus_modify_changed);1343 1344/**1345 * mdiobus_c45_modify_changed - Convenience function for modifying a given mdio1346 * device register and returning if it changed1347 * @bus: the mii_bus struct1348 * @addr: the phy address1349 * @devad: device address to read1350 * @regnum: register number to write1351 * @mask: bit mask of bits to clear1352 * @set: bit mask of bits to set1353 */1354int mdiobus_c45_modify_changed(struct mii_bus *bus, int addr, int devad,1355 u32 regnum, u16 mask, u16 set)1356{1357 int err;1358 1359 mutex_lock(&bus->mdio_lock);1360 err = __mdiobus_c45_modify_changed(bus, addr, devad, regnum, mask, set);1361 mutex_unlock(&bus->mdio_lock);1362 1363 return err;1364}1365EXPORT_SYMBOL_GPL(mdiobus_c45_modify_changed);1366 1367/**1368 * mdio_bus_match - determine if given MDIO driver supports the given1369 * MDIO device1370 * @dev: target MDIO device1371 * @drv: given MDIO driver1372 *1373 * Description: Given a MDIO device, and a MDIO driver, return 1 if1374 * the driver supports the device. Otherwise, return 0. This may1375 * require calling the devices own match function, since different classes1376 * of MDIO devices have different match criteria.1377 */1378static int mdio_bus_match(struct device *dev, const struct device_driver *drv)1379{1380 const struct mdio_driver *mdiodrv = to_mdio_driver(drv);1381 struct mdio_device *mdio = to_mdio_device(dev);1382 1383 /* Both the driver and device must type-match */1384 if (!(mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY) !=1385 !(mdio->flags & MDIO_DEVICE_FLAG_PHY))1386 return 0;1387 1388 if (of_driver_match_device(dev, drv))1389 return 1;1390 1391 if (mdio->bus_match)1392 return mdio->bus_match(dev, drv);1393 1394 return 0;1395}1396 1397static int mdio_uevent(const struct device *dev, struct kobj_uevent_env *env)1398{1399 int rc;1400 1401 /* Some devices have extra OF data and an OF-style MODALIAS */1402 rc = of_device_uevent_modalias(dev, env);1403 if (rc != -ENODEV)1404 return rc;1405 1406 return 0;1407}1408 1409static struct attribute *mdio_bus_device_statistics_attrs[] = {1410 &dev_attr_mdio_bus_device_transfers.attr.attr,1411 &dev_attr_mdio_bus_device_errors.attr.attr,1412 &dev_attr_mdio_bus_device_writes.attr.attr,1413 &dev_attr_mdio_bus_device_reads.attr.attr,1414 NULL,1415};1416 1417static const struct attribute_group mdio_bus_device_statistics_group = {1418 .name = "statistics",1419 .attrs = mdio_bus_device_statistics_attrs,1420};1421 1422static const struct attribute_group *mdio_bus_dev_groups[] = {1423 &mdio_bus_device_statistics_group,1424 NULL,1425};1426 1427const struct bus_type mdio_bus_type = {1428 .name = "mdio_bus",1429 .dev_groups = mdio_bus_dev_groups,1430 .match = mdio_bus_match,1431 .uevent = mdio_uevent,1432};1433EXPORT_SYMBOL(mdio_bus_type);1434 1435int __init mdio_bus_init(void)1436{1437 int ret;1438 1439 ret = class_register(&mdio_bus_class);1440 if (!ret) {1441 ret = bus_register(&mdio_bus_type);1442 if (ret)1443 class_unregister(&mdio_bus_class);1444 }1445 1446 return ret;1447}1448 1449#if IS_ENABLED(CONFIG_PHYLIB)1450void mdio_bus_exit(void)1451{1452 class_unregister(&mdio_bus_class);1453 bus_unregister(&mdio_bus_type);1454}1455EXPORT_SYMBOL_GPL(mdio_bus_exit);1456#else1457module_init(mdio_bus_init);1458/* no module_exit, intentional */1459MODULE_LICENSE("GPL");1460MODULE_DESCRIPTION("MDIO bus/device layer");1461#endif1462