Commit | Line | Data |
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02d320c3 | 1 | /* MDIO Bus interface |
00db8189 AF |
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 | */ | |
8d242488 JP |
13 | |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
15 | ||
00db8189 | 16 | #include <linux/kernel.h> |
00db8189 AF |
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> | |
3d1e4db2 | 24 | #include <linux/device.h> |
a30e2c18 | 25 | #include <linux/of_device.h> |
4085a7f0 | 26 | #include <linux/of_mdio.h> |
00db8189 AF |
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> | |
00db8189 AF |
33 | #include <linux/mii.h> |
34 | #include <linux/ethtool.h> | |
35 | #include <linux/phy.h> | |
02d320c3 SS |
36 | #include <linux/io.h> |
37 | #include <linux/uaccess.h> | |
00db8189 | 38 | |
00db8189 | 39 | #include <asm/irq.h> |
00db8189 | 40 | |
298cf9be | 41 | /** |
eb8a54a7 | 42 | * mdiobus_alloc_size - allocate a mii_bus structure |
af58f1d6 RD |
43 | * @size: extra amount of memory to allocate for private storage. |
44 | * If non-zero, then bus->priv is points to that memory. | |
298cf9be LB |
45 | * |
46 | * Description: called by a bus driver to allocate an mii_bus | |
47 | * structure to fill in. | |
48 | */ | |
eb8a54a7 | 49 | struct mii_bus *mdiobus_alloc_size(size_t size) |
298cf9be | 50 | { |
46abc021 | 51 | struct mii_bus *bus; |
eb8a54a7 TT |
52 | size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN); |
53 | size_t alloc_size; | |
54 | ||
55 | /* If we alloc extra space, it should be aligned */ | |
56 | if (size) | |
57 | alloc_size = aligned_size + size; | |
58 | else | |
59 | alloc_size = sizeof(*bus); | |
46abc021 | 60 | |
eb8a54a7 TT |
61 | bus = kzalloc(alloc_size, GFP_KERNEL); |
62 | if (bus) { | |
46abc021 | 63 | bus->state = MDIOBUS_ALLOCATED; |
eb8a54a7 TT |
64 | if (size) |
65 | bus->priv = (void *)bus + aligned_size; | |
66 | } | |
46abc021 LB |
67 | |
68 | return bus; | |
298cf9be | 69 | } |
eb8a54a7 | 70 | EXPORT_SYMBOL(mdiobus_alloc_size); |
298cf9be | 71 | |
6d48f44b GS |
72 | static void _devm_mdiobus_free(struct device *dev, void *res) |
73 | { | |
74 | mdiobus_free(*(struct mii_bus **)res); | |
75 | } | |
76 | ||
77 | static int devm_mdiobus_match(struct device *dev, void *res, void *data) | |
78 | { | |
79 | struct mii_bus **r = res; | |
80 | ||
81 | if (WARN_ON(!r || !*r)) | |
82 | return 0; | |
83 | ||
84 | return *r == data; | |
85 | } | |
86 | ||
87 | /** | |
88 | * devm_mdiobus_alloc_size - Resource-managed mdiobus_alloc_size() | |
89 | * @dev: Device to allocate mii_bus for | |
90 | * @sizeof_priv: Space to allocate for private structure. | |
91 | * | |
92 | * Managed mdiobus_alloc_size. mii_bus allocated with this function is | |
93 | * automatically freed on driver detach. | |
94 | * | |
95 | * If an mii_bus allocated with this function needs to be freed separately, | |
96 | * devm_mdiobus_free() must be used. | |
97 | * | |
98 | * RETURNS: | |
99 | * Pointer to allocated mii_bus on success, NULL on failure. | |
100 | */ | |
101 | struct mii_bus *devm_mdiobus_alloc_size(struct device *dev, int sizeof_priv) | |
102 | { | |
103 | struct mii_bus **ptr, *bus; | |
104 | ||
105 | ptr = devres_alloc(_devm_mdiobus_free, sizeof(*ptr), GFP_KERNEL); | |
106 | if (!ptr) | |
107 | return NULL; | |
108 | ||
109 | /* use raw alloc_dr for kmalloc caller tracing */ | |
110 | bus = mdiobus_alloc_size(sizeof_priv); | |
111 | if (bus) { | |
112 | *ptr = bus; | |
113 | devres_add(dev, ptr); | |
114 | } else { | |
115 | devres_free(ptr); | |
116 | } | |
117 | ||
118 | return bus; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(devm_mdiobus_alloc); | |
121 | ||
122 | /** | |
123 | * devm_mdiobus_free - Resource-managed mdiobus_free() | |
124 | * @dev: Device this mii_bus belongs to | |
125 | * @bus: the mii_bus associated with the device | |
126 | * | |
127 | * Free mii_bus allocated with devm_mdiobus_alloc_size(). | |
128 | */ | |
129 | void devm_mdiobus_free(struct device *dev, struct mii_bus *bus) | |
130 | { | |
131 | int rc; | |
132 | ||
133 | rc = devres_release(dev, _devm_mdiobus_free, | |
134 | devm_mdiobus_match, bus); | |
135 | WARN_ON(rc); | |
136 | } | |
137 | EXPORT_SYMBOL_GPL(devm_mdiobus_free); | |
138 | ||
46abc021 LB |
139 | /** |
140 | * mdiobus_release - mii_bus device release callback | |
78c36b15 | 141 | * @d: the target struct device that contains the mii_bus |
46abc021 LB |
142 | * |
143 | * Description: called when the last reference to an mii_bus is | |
144 | * dropped, to free the underlying memory. | |
145 | */ | |
146 | static void mdiobus_release(struct device *d) | |
147 | { | |
148 | struct mii_bus *bus = to_mii_bus(d); | |
161c8d2f KH |
149 | BUG_ON(bus->state != MDIOBUS_RELEASED && |
150 | /* for compatibility with error handling in drivers */ | |
151 | bus->state != MDIOBUS_ALLOCATED); | |
46abc021 LB |
152 | kfree(bus); |
153 | } | |
154 | ||
155 | static struct class mdio_bus_class = { | |
156 | .name = "mdio_bus", | |
157 | .dev_release = mdiobus_release, | |
158 | }; | |
159 | ||
b943fbb0 | 160 | #if IS_ENABLED(CONFIG_OF_MDIO) |
25106022 | 161 | /* Helper function for of_mdio_find_bus */ |
9f3b795a | 162 | static int of_mdio_bus_match(struct device *dev, const void *mdio_bus_np) |
25106022 DD |
163 | { |
164 | return dev->of_node == mdio_bus_np; | |
165 | } | |
166 | /** | |
167 | * of_mdio_find_bus - Given an mii_bus node, find the mii_bus. | |
f41ef2e7 | 168 | * @mdio_bus_np: Pointer to the mii_bus. |
25106022 DD |
169 | * |
170 | * Returns a pointer to the mii_bus, or NULL if none found. | |
171 | * | |
172 | * Because the association of a device_node and mii_bus is made via | |
173 | * of_mdiobus_register(), the mii_bus cannot be found before it is | |
174 | * registered with of_mdiobus_register(). | |
175 | * | |
176 | */ | |
177 | struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np) | |
178 | { | |
179 | struct device *d; | |
180 | ||
181 | if (!mdio_bus_np) | |
182 | return NULL; | |
183 | ||
184 | d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np, | |
185 | of_mdio_bus_match); | |
186 | ||
187 | return d ? to_mii_bus(d) : NULL; | |
188 | } | |
189 | EXPORT_SYMBOL(of_mdio_find_bus); | |
190 | #endif | |
191 | ||
b3df0da8 RD |
192 | /** |
193 | * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus | |
194 | * @bus: target mii_bus | |
e1393456 | 195 | * |
b3df0da8 RD |
196 | * Description: Called by a bus driver to bring up all the PHYs |
197 | * on a given bus, and attach them to the bus. | |
198 | * | |
199 | * Returns 0 on success or < 0 on error. | |
e1393456 AF |
200 | */ |
201 | int mdiobus_register(struct mii_bus *bus) | |
202 | { | |
161c8d2f | 203 | int i, err; |
e1393456 | 204 | |
e1393456 | 205 | if (NULL == bus || NULL == bus->name || |
02d320c3 | 206 | NULL == bus->read || NULL == bus->write) |
e1393456 AF |
207 | return -EINVAL; |
208 | ||
46abc021 LB |
209 | BUG_ON(bus->state != MDIOBUS_ALLOCATED && |
210 | bus->state != MDIOBUS_UNREGISTERED); | |
211 | ||
212 | bus->dev.parent = bus->parent; | |
213 | bus->dev.class = &mdio_bus_class; | |
214 | bus->dev.groups = NULL; | |
036b6687 | 215 | dev_set_name(&bus->dev, "%s", bus->id); |
46abc021 LB |
216 | |
217 | err = device_register(&bus->dev); | |
218 | if (err) { | |
8d242488 | 219 | pr_err("mii_bus %s failed to register\n", bus->id); |
0c692d07 | 220 | put_device(&bus->dev); |
46abc021 LB |
221 | return -EINVAL; |
222 | } | |
223 | ||
d1e7fe4d AB |
224 | mutex_init(&bus->mdio_lock); |
225 | ||
e1393456 AF |
226 | if (bus->reset) |
227 | bus->reset(bus); | |
228 | ||
229 | for (i = 0; i < PHY_MAX_ADDR; i++) { | |
4fd5f812 LB |
230 | if ((bus->phy_mask & (1 << i)) == 0) { |
231 | struct phy_device *phydev; | |
e1393456 | 232 | |
4fd5f812 | 233 | phydev = mdiobus_scan(bus, i); |
161c8d2f | 234 | if (IS_ERR(phydev)) { |
4fd5f812 | 235 | err = PTR_ERR(phydev); |
161c8d2f KH |
236 | goto error; |
237 | } | |
64b1c2b4 | 238 | } |
e1393456 AF |
239 | } |
240 | ||
161c8d2f | 241 | bus->state = MDIOBUS_REGISTERED; |
e1393456 | 242 | pr_info("%s: probed\n", bus->name); |
161c8d2f | 243 | return 0; |
e1393456 | 244 | |
161c8d2f KH |
245 | error: |
246 | while (--i >= 0) { | |
247 | if (bus->phy_map[i]) | |
248 | device_unregister(&bus->phy_map[i]->dev); | |
249 | } | |
250 | device_del(&bus->dev); | |
e1393456 AF |
251 | return err; |
252 | } | |
253 | EXPORT_SYMBOL(mdiobus_register); | |
254 | ||
255 | void mdiobus_unregister(struct mii_bus *bus) | |
256 | { | |
257 | int i; | |
258 | ||
46abc021 LB |
259 | BUG_ON(bus->state != MDIOBUS_REGISTERED); |
260 | bus->state = MDIOBUS_UNREGISTERED; | |
261 | ||
3e44017b | 262 | device_del(&bus->dev); |
e1393456 | 263 | for (i = 0; i < PHY_MAX_ADDR; i++) { |
6f4a7f41 | 264 | if (bus->phy_map[i]) |
e1393456 | 265 | device_unregister(&bus->phy_map[i]->dev); |
4dea547f | 266 | bus->phy_map[i] = NULL; |
e1393456 AF |
267 | } |
268 | } | |
269 | EXPORT_SYMBOL(mdiobus_unregister); | |
270 | ||
298cf9be LB |
271 | /** |
272 | * mdiobus_free - free a struct mii_bus | |
273 | * @bus: mii_bus to free | |
274 | * | |
46abc021 LB |
275 | * This function releases the reference to the underlying device |
276 | * object in the mii_bus. If this is the last reference, the mii_bus | |
277 | * will be freed. | |
298cf9be LB |
278 | */ |
279 | void mdiobus_free(struct mii_bus *bus) | |
280 | { | |
02d320c3 | 281 | /* For compatibility with error handling in drivers. */ |
46abc021 LB |
282 | if (bus->state == MDIOBUS_ALLOCATED) { |
283 | kfree(bus); | |
284 | return; | |
285 | } | |
286 | ||
287 | BUG_ON(bus->state != MDIOBUS_UNREGISTERED); | |
288 | bus->state = MDIOBUS_RELEASED; | |
289 | ||
290 | put_device(&bus->dev); | |
298cf9be LB |
291 | } |
292 | EXPORT_SYMBOL(mdiobus_free); | |
293 | ||
4fd5f812 LB |
294 | struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr) |
295 | { | |
296 | struct phy_device *phydev; | |
297 | int err; | |
298 | ||
ac28b9f8 | 299 | phydev = get_phy_device(bus, addr, false); |
4fd5f812 LB |
300 | if (IS_ERR(phydev) || phydev == NULL) |
301 | return phydev; | |
302 | ||
4dea547f | 303 | err = phy_device_register(phydev); |
4fd5f812 | 304 | if (err) { |
4fd5f812 | 305 | phy_device_free(phydev); |
4dea547f | 306 | return NULL; |
4fd5f812 LB |
307 | } |
308 | ||
4fd5f812 LB |
309 | return phydev; |
310 | } | |
311 | EXPORT_SYMBOL(mdiobus_scan); | |
312 | ||
2e888103 LB |
313 | /** |
314 | * mdiobus_read - Convenience function for reading a given MII mgmt register | |
315 | * @bus: the mii_bus struct | |
316 | * @addr: the phy address | |
317 | * @regnum: register number to read | |
318 | * | |
319 | * NOTE: MUST NOT be called from interrupt context, | |
320 | * because the bus read/write functions may wait for an interrupt | |
321 | * to conclude the operation. | |
322 | */ | |
abf35df2 | 323 | int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum) |
2e888103 LB |
324 | { |
325 | int retval; | |
326 | ||
327 | BUG_ON(in_interrupt()); | |
328 | ||
329 | mutex_lock(&bus->mdio_lock); | |
330 | retval = bus->read(bus, addr, regnum); | |
331 | mutex_unlock(&bus->mdio_lock); | |
332 | ||
333 | return retval; | |
334 | } | |
335 | EXPORT_SYMBOL(mdiobus_read); | |
336 | ||
337 | /** | |
338 | * mdiobus_write - Convenience function for writing a given MII mgmt register | |
339 | * @bus: the mii_bus struct | |
340 | * @addr: the phy address | |
341 | * @regnum: register number to write | |
342 | * @val: value to write to @regnum | |
343 | * | |
344 | * NOTE: MUST NOT be called from interrupt context, | |
345 | * because the bus read/write functions may wait for an interrupt | |
346 | * to conclude the operation. | |
347 | */ | |
abf35df2 | 348 | int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val) |
2e888103 LB |
349 | { |
350 | int err; | |
351 | ||
352 | BUG_ON(in_interrupt()); | |
353 | ||
354 | mutex_lock(&bus->mdio_lock); | |
355 | err = bus->write(bus, addr, regnum, val); | |
356 | mutex_unlock(&bus->mdio_lock); | |
357 | ||
358 | return err; | |
359 | } | |
360 | EXPORT_SYMBOL(mdiobus_write); | |
361 | ||
b3df0da8 RD |
362 | /** |
363 | * mdio_bus_match - determine if given PHY driver supports the given PHY device | |
364 | * @dev: target PHY device | |
365 | * @drv: given PHY driver | |
00db8189 | 366 | * |
b3df0da8 RD |
367 | * Description: Given a PHY device, and a PHY driver, return 1 if |
368 | * the driver supports the device. Otherwise, return 0. | |
00db8189 AF |
369 | */ |
370 | static int mdio_bus_match(struct device *dev, struct device_driver *drv) | |
371 | { | |
372 | struct phy_device *phydev = to_phy_device(dev); | |
373 | struct phy_driver *phydrv = to_phy_driver(drv); | |
374 | ||
a30e2c18 DD |
375 | if (of_driver_match_device(dev, drv)) |
376 | return 1; | |
377 | ||
378 | if (phydrv->match_phy_device) | |
379 | return phydrv->match_phy_device(phydev); | |
380 | ||
6f901b73 FF |
381 | return (phydrv->phy_id & phydrv->phy_id_mask) == |
382 | (phydev->phy_id & phydrv->phy_id_mask); | |
00db8189 AF |
383 | } |
384 | ||
2f5cb434 AV |
385 | #ifdef CONFIG_PM |
386 | ||
3d1e4db2 AV |
387 | static bool mdio_bus_phy_may_suspend(struct phy_device *phydev) |
388 | { | |
389 | struct device_driver *drv = phydev->dev.driver; | |
390 | struct phy_driver *phydrv = to_phy_driver(drv); | |
391 | struct net_device *netdev = phydev->attached_dev; | |
392 | ||
393 | if (!drv || !phydrv->suspend) | |
394 | return false; | |
395 | ||
396 | /* PHY not attached? May suspend. */ | |
397 | if (!netdev) | |
398 | return true; | |
399 | ||
02d320c3 | 400 | /* Don't suspend PHY if the attched netdev parent may wakeup. |
3d1e4db2 AV |
401 | * The parent may point to a PCI device, as in tg3 driver. |
402 | */ | |
403 | if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent)) | |
404 | return false; | |
405 | ||
02d320c3 | 406 | /* Also don't suspend PHY if the netdev itself may wakeup. This |
3d1e4db2 AV |
407 | * is the case for devices w/o underlaying pwr. mgmt. aware bus, |
408 | * e.g. SoC devices. | |
409 | */ | |
410 | if (device_may_wakeup(&netdev->dev)) | |
411 | return false; | |
412 | ||
413 | return true; | |
414 | } | |
415 | ||
2f5cb434 | 416 | static int mdio_bus_suspend(struct device *dev) |
00db8189 | 417 | { |
3d1e4db2 | 418 | struct phy_driver *phydrv = to_phy_driver(dev->driver); |
0f0ca340 | 419 | struct phy_device *phydev = to_phy_device(dev); |
00db8189 | 420 | |
02d320c3 | 421 | /* We must stop the state machine manually, otherwise it stops out of |
541cd3ee AV |
422 | * control, possibly with the phydev->lock held. Upon resume, netdev |
423 | * may call phy routines that try to grab the same lock, and that may | |
424 | * lead to a deadlock. | |
425 | */ | |
fddd9101 | 426 | if (phydev->attached_dev && phydev->adjust_link) |
541cd3ee AV |
427 | phy_stop_machine(phydev); |
428 | ||
3d1e4db2 AV |
429 | if (!mdio_bus_phy_may_suspend(phydev)) |
430 | return 0; | |
541cd3ee | 431 | |
3d1e4db2 | 432 | return phydrv->suspend(phydev); |
00db8189 AF |
433 | } |
434 | ||
2f5cb434 | 435 | static int mdio_bus_resume(struct device *dev) |
00db8189 | 436 | { |
3d1e4db2 | 437 | struct phy_driver *phydrv = to_phy_driver(dev->driver); |
0f0ca340 | 438 | struct phy_device *phydev = to_phy_device(dev); |
541cd3ee | 439 | int ret; |
00db8189 | 440 | |
3d1e4db2 | 441 | if (!mdio_bus_phy_may_suspend(phydev)) |
541cd3ee AV |
442 | goto no_resume; |
443 | ||
444 | ret = phydrv->resume(phydev); | |
445 | if (ret < 0) | |
446 | return ret; | |
447 | ||
448 | no_resume: | |
fddd9101 | 449 | if (phydev->attached_dev && phydev->adjust_link) |
29935aeb | 450 | phy_start_machine(phydev); |
541cd3ee AV |
451 | |
452 | return 0; | |
00db8189 AF |
453 | } |
454 | ||
2f5cb434 AV |
455 | static int mdio_bus_restore(struct device *dev) |
456 | { | |
457 | struct phy_device *phydev = to_phy_device(dev); | |
458 | struct net_device *netdev = phydev->attached_dev; | |
459 | int ret; | |
460 | ||
461 | if (!netdev) | |
462 | return 0; | |
463 | ||
464 | ret = phy_init_hw(phydev); | |
465 | if (ret < 0) | |
466 | return ret; | |
467 | ||
468 | /* The PHY needs to renegotiate. */ | |
469 | phydev->link = 0; | |
470 | phydev->state = PHY_UP; | |
471 | ||
29935aeb | 472 | phy_start_machine(phydev); |
2f5cb434 AV |
473 | |
474 | return 0; | |
475 | } | |
476 | ||
02d320c3 | 477 | static const struct dev_pm_ops mdio_bus_pm_ops = { |
2f5cb434 AV |
478 | .suspend = mdio_bus_suspend, |
479 | .resume = mdio_bus_resume, | |
480 | .freeze = mdio_bus_suspend, | |
481 | .thaw = mdio_bus_resume, | |
482 | .restore = mdio_bus_restore, | |
483 | }; | |
484 | ||
485 | #define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops) | |
486 | ||
487 | #else | |
488 | ||
489 | #define MDIO_BUS_PM_OPS NULL | |
490 | ||
491 | #endif /* CONFIG_PM */ | |
492 | ||
56277f40 NB |
493 | static ssize_t |
494 | phy_id_show(struct device *dev, struct device_attribute *attr, char *buf) | |
495 | { | |
496 | struct phy_device *phydev = to_phy_device(dev); | |
497 | ||
498 | return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id); | |
499 | } | |
4192c749 | 500 | static DEVICE_ATTR_RO(phy_id); |
56277f40 | 501 | |
3d055d8d FF |
502 | static ssize_t |
503 | phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf) | |
504 | { | |
505 | struct phy_device *phydev = to_phy_device(dev); | |
506 | ||
507 | return sprintf(buf, "%s\n", phy_modes(phydev->interface)); | |
508 | } | |
509 | static DEVICE_ATTR_RO(phy_interface); | |
510 | ||
8bed1285 FF |
511 | static ssize_t |
512 | phy_has_fixups_show(struct device *dev, struct device_attribute *attr, char *buf) | |
513 | { | |
514 | struct phy_device *phydev = to_phy_device(dev); | |
515 | ||
516 | return sprintf(buf, "%d\n", phydev->has_fixups); | |
517 | } | |
518 | static DEVICE_ATTR_RO(phy_has_fixups); | |
519 | ||
4192c749 GKH |
520 | static struct attribute *mdio_dev_attrs[] = { |
521 | &dev_attr_phy_id.attr, | |
3d055d8d | 522 | &dev_attr_phy_interface.attr, |
8bed1285 | 523 | &dev_attr_phy_has_fixups.attr, |
4192c749 | 524 | NULL, |
56277f40 | 525 | }; |
4192c749 | 526 | ATTRIBUTE_GROUPS(mdio_dev); |
56277f40 | 527 | |
00db8189 AF |
528 | struct bus_type mdio_bus_type = { |
529 | .name = "mdio_bus", | |
530 | .match = mdio_bus_match, | |
2f5cb434 | 531 | .pm = MDIO_BUS_PM_OPS, |
4192c749 | 532 | .dev_groups = mdio_dev_groups, |
00db8189 | 533 | }; |
11b0bacd | 534 | EXPORT_SYMBOL(mdio_bus_type); |
00db8189 | 535 | |
67c4f3fa | 536 | int __init mdio_bus_init(void) |
00db8189 | 537 | { |
46abc021 LB |
538 | int ret; |
539 | ||
540 | ret = class_register(&mdio_bus_class); | |
541 | if (!ret) { | |
542 | ret = bus_register(&mdio_bus_type); | |
543 | if (ret) | |
544 | class_unregister(&mdio_bus_class); | |
545 | } | |
546 | ||
547 | return ret; | |
00db8189 AF |
548 | } |
549 | ||
dc85dec6 | 550 | void mdio_bus_exit(void) |
e1393456 | 551 | { |
46abc021 | 552 | class_unregister(&mdio_bus_class); |
e1393456 AF |
553 | bus_unregister(&mdio_bus_type); |
554 | } |