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1/*
2 * drivers/net/phy/mdio_bus.c
3 *
4 * MDIO Bus interface
5 *
6 * Author: Andy Fleming
7 *
8 * Copyright (c) 2004 Freescale Semiconductor, Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
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/netdevice.h>
26#include <linux/etherdevice.h>
27#include <linux/skbuff.h>
28#include <linux/spinlock.h>
29#include <linux/mm.h>
30#include <linux/module.h>
31#include <linux/mii.h>
32#include <linux/ethtool.h>
33#include <linux/phy.h>
34
35#include <asm/io.h>
36#include <asm/irq.h>
37#include <asm/uaccess.h>
38
39/**
40 * mdiobus_alloc - allocate a mii_bus structure
41 *
42 * Description: called by a bus driver to allocate an mii_bus
43 * structure to fill in.
44 */
45struct mii_bus *mdiobus_alloc(void)
46{
47 struct mii_bus *bus;
48
49 bus = kzalloc(sizeof(*bus), GFP_KERNEL);
50 if (bus != NULL)
51 bus->state = MDIOBUS_ALLOCATED;
52
53 return bus;
54}
55EXPORT_SYMBOL(mdiobus_alloc);
56
57/**
58 * mdiobus_release - mii_bus device release callback
59 * @d: the target struct device that contains the mii_bus
60 *
61 * Description: called when the last reference to an mii_bus is
62 * dropped, to free the underlying memory.
63 */
64static void mdiobus_release(struct device *d)
65{
66 struct mii_bus *bus = to_mii_bus(d);
67 BUG_ON(bus->state != MDIOBUS_RELEASED &&
68 /* for compatibility with error handling in drivers */
69 bus->state != MDIOBUS_ALLOCATED);
70 kfree(bus);
71}
72
73static struct class mdio_bus_class = {
74 .name = "mdio_bus",
75 .dev_release = mdiobus_release,
76};
77
78/**
79 * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
80 * @bus: target mii_bus
81 *
82 * Description: Called by a bus driver to bring up all the PHYs
83 * on a given bus, and attach them to the bus.
84 *
85 * Returns 0 on success or < 0 on error.
86 */
87int mdiobus_register(struct mii_bus *bus)
88{
89 int i, err;
90
91 if (NULL == bus || NULL == bus->name ||
92 NULL == bus->read ||
93 NULL == bus->write)
94 return -EINVAL;
95
96 BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
97 bus->state != MDIOBUS_UNREGISTERED);
98
99 bus->dev.parent = bus->parent;
100 bus->dev.class = &mdio_bus_class;
101 bus->dev.groups = NULL;
102 dev_set_name(&bus->dev, "%s", bus->id);
103
104 err = device_register(&bus->dev);
105 if (err) {
106 printk(KERN_ERR "mii_bus %s failed to register\n", bus->id);
107 return -EINVAL;
108 }
109
110 mutex_init(&bus->mdio_lock);
111
112 if (bus->reset)
113 bus->reset(bus);
114
115 for (i = 0; i < PHY_MAX_ADDR; i++) {
116 if ((bus->phy_mask & (1 << i)) == 0) {
117 struct phy_device *phydev;
118
119 phydev = mdiobus_scan(bus, i);
120 if (IS_ERR(phydev)) {
121 err = PTR_ERR(phydev);
122 goto error;
123 }
124 }
125 }
126
127 bus->state = MDIOBUS_REGISTERED;
128 pr_info("%s: probed\n", bus->name);
129 return 0;
130
131error:
132 while (--i >= 0) {
133 if (bus->phy_map[i])
134 device_unregister(&bus->phy_map[i]->dev);
135 }
136 device_del(&bus->dev);
137 return err;
138}
139EXPORT_SYMBOL(mdiobus_register);
140
141void mdiobus_unregister(struct mii_bus *bus)
142{
143 int i;
144
145 BUG_ON(bus->state != MDIOBUS_REGISTERED);
146 bus->state = MDIOBUS_UNREGISTERED;
147
148 device_del(&bus->dev);
149 for (i = 0; i < PHY_MAX_ADDR; i++) {
150 if (bus->phy_map[i])
151 device_unregister(&bus->phy_map[i]->dev);
152 bus->phy_map[i] = NULL;
153 }
154}
155EXPORT_SYMBOL(mdiobus_unregister);
156
157/**
158 * mdiobus_free - free a struct mii_bus
159 * @bus: mii_bus to free
160 *
161 * This function releases the reference to the underlying device
162 * object in the mii_bus. If this is the last reference, the mii_bus
163 * will be freed.
164 */
165void mdiobus_free(struct mii_bus *bus)
166{
167 /*
168 * For compatibility with error handling in drivers.
169 */
170 if (bus->state == MDIOBUS_ALLOCATED) {
171 kfree(bus);
172 return;
173 }
174
175 BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
176 bus->state = MDIOBUS_RELEASED;
177
178 put_device(&bus->dev);
179}
180EXPORT_SYMBOL(mdiobus_free);
181
182struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
183{
184 struct phy_device *phydev;
185 int err;
186
187 phydev = get_phy_device(bus, addr);
188 if (IS_ERR(phydev) || phydev == NULL)
189 return phydev;
190
191 err = phy_device_register(phydev);
192 if (err) {
193 phy_device_free(phydev);
194 return NULL;
195 }
196
197 return phydev;
198}
199EXPORT_SYMBOL(mdiobus_scan);
200
201/**
202 * mdiobus_read - Convenience function for reading a given MII mgmt register
203 * @bus: the mii_bus struct
204 * @addr: the phy address
205 * @regnum: register number to read
206 *
207 * NOTE: MUST NOT be called from interrupt context,
208 * because the bus read/write functions may wait for an interrupt
209 * to conclude the operation.
210 */
211int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
212{
213 int retval;
214
215 BUG_ON(in_interrupt());
216
217 mutex_lock(&bus->mdio_lock);
218 retval = bus->read(bus, addr, regnum);
219 mutex_unlock(&bus->mdio_lock);
220
221 return retval;
222}
223EXPORT_SYMBOL(mdiobus_read);
224
225/**
226 * mdiobus_write - Convenience function for writing a given MII mgmt register
227 * @bus: the mii_bus struct
228 * @addr: the phy address
229 * @regnum: register number to write
230 * @val: value to write to @regnum
231 *
232 * NOTE: MUST NOT be called from interrupt context,
233 * because the bus read/write functions may wait for an interrupt
234 * to conclude the operation.
235 */
236int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
237{
238 int err;
239
240 BUG_ON(in_interrupt());
241
242 mutex_lock(&bus->mdio_lock);
243 err = bus->write(bus, addr, regnum, val);
244 mutex_unlock(&bus->mdio_lock);
245
246 return err;
247}
248EXPORT_SYMBOL(mdiobus_write);
249
250/**
251 * mdio_bus_match - determine if given PHY driver supports the given PHY device
252 * @dev: target PHY device
253 * @drv: given PHY driver
254 *
255 * Description: Given a PHY device, and a PHY driver, return 1 if
256 * the driver supports the device. Otherwise, return 0.
257 */
258static int mdio_bus_match(struct device *dev, struct device_driver *drv)
259{
260 struct phy_device *phydev = to_phy_device(dev);
261 struct phy_driver *phydrv = to_phy_driver(drv);
262
263 return ((phydrv->phy_id & phydrv->phy_id_mask) ==
264 (phydev->phy_id & phydrv->phy_id_mask));
265}
266
267#ifdef CONFIG_PM
268
269static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
270{
271 struct device_driver *drv = phydev->dev.driver;
272 struct phy_driver *phydrv = to_phy_driver(drv);
273 struct net_device *netdev = phydev->attached_dev;
274
275 if (!drv || !phydrv->suspend)
276 return false;
277
278 /* PHY not attached? May suspend. */
279 if (!netdev)
280 return true;
281
282 /*
283 * Don't suspend PHY if the attched netdev parent may wakeup.
284 * The parent may point to a PCI device, as in tg3 driver.
285 */
286 if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
287 return false;
288
289 /*
290 * Also don't suspend PHY if the netdev itself may wakeup. This
291 * is the case for devices w/o underlaying pwr. mgmt. aware bus,
292 * e.g. SoC devices.
293 */
294 if (device_may_wakeup(&netdev->dev))
295 return false;
296
297 return true;
298}
299
300static int mdio_bus_suspend(struct device *dev)
301{
302 struct phy_driver *phydrv = to_phy_driver(dev->driver);
303 struct phy_device *phydev = to_phy_device(dev);
304
305 /*
306 * We must stop the state machine manually, otherwise it stops out of
307 * control, possibly with the phydev->lock held. Upon resume, netdev
308 * may call phy routines that try to grab the same lock, and that may
309 * lead to a deadlock.
310 */
311 if (phydev->attached_dev && phydev->adjust_link)
312 phy_stop_machine(phydev);
313
314 if (!mdio_bus_phy_may_suspend(phydev))
315 return 0;
316
317 return phydrv->suspend(phydev);
318}
319
320static int mdio_bus_resume(struct device *dev)
321{
322 struct phy_driver *phydrv = to_phy_driver(dev->driver);
323 struct phy_device *phydev = to_phy_device(dev);
324 int ret;
325
326 if (!mdio_bus_phy_may_suspend(phydev))
327 goto no_resume;
328
329 ret = phydrv->resume(phydev);
330 if (ret < 0)
331 return ret;
332
333no_resume:
334 if (phydev->attached_dev && phydev->adjust_link)
335 phy_start_machine(phydev, NULL);
336
337 return 0;
338}
339
340static int mdio_bus_restore(struct device *dev)
341{
342 struct phy_device *phydev = to_phy_device(dev);
343 struct net_device *netdev = phydev->attached_dev;
344 int ret;
345
346 if (!netdev)
347 return 0;
348
349 ret = phy_init_hw(phydev);
350 if (ret < 0)
351 return ret;
352
353 /* The PHY needs to renegotiate. */
354 phydev->link = 0;
355 phydev->state = PHY_UP;
356
357 phy_start_machine(phydev, NULL);
358
359 return 0;
360}
361
362static struct dev_pm_ops mdio_bus_pm_ops = {
363 .suspend = mdio_bus_suspend,
364 .resume = mdio_bus_resume,
365 .freeze = mdio_bus_suspend,
366 .thaw = mdio_bus_resume,
367 .restore = mdio_bus_restore,
368};
369
370#define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops)
371
372#else
373
374#define MDIO_BUS_PM_OPS NULL
375
376#endif /* CONFIG_PM */
377
378struct bus_type mdio_bus_type = {
379 .name = "mdio_bus",
380 .match = mdio_bus_match,
381 .pm = MDIO_BUS_PM_OPS,
382};
383EXPORT_SYMBOL(mdio_bus_type);
384
385int __init mdio_bus_init(void)
386{
387 int ret;
388
389 ret = class_register(&mdio_bus_class);
390 if (!ret) {
391 ret = bus_register(&mdio_bus_type);
392 if (ret)
393 class_unregister(&mdio_bus_class);
394 }
395
396 return ret;
397}
398
399void mdio_bus_exit(void)
400{
401 class_unregister(&mdio_bus_class);
402 bus_unregister(&mdio_bus_type);
403}
1/*
2 * drivers/net/phy/mdio_bus.c
3 *
4 * MDIO Bus interface
5 *
6 * Author: Andy Fleming
7 *
8 * Copyright (c) 2004 Freescale Semiconductor, Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
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/netdevice.h>
26#include <linux/etherdevice.h>
27#include <linux/skbuff.h>
28#include <linux/spinlock.h>
29#include <linux/mm.h>
30#include <linux/module.h>
31#include <linux/mii.h>
32#include <linux/ethtool.h>
33#include <linux/phy.h>
34
35#include <asm/io.h>
36#include <asm/irq.h>
37#include <asm/uaccess.h>
38
39/**
40 * mdiobus_alloc_size - allocate a mii_bus structure
41 * @size: extra amount of memory to allocate for private storage.
42 * If non-zero, then bus->priv is points to that memory.
43 *
44 * Description: called by a bus driver to allocate an mii_bus
45 * structure to fill in.
46 */
47struct mii_bus *mdiobus_alloc_size(size_t size)
48{
49 struct mii_bus *bus;
50 size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);
51 size_t alloc_size;
52
53 /* If we alloc extra space, it should be aligned */
54 if (size)
55 alloc_size = aligned_size + size;
56 else
57 alloc_size = sizeof(*bus);
58
59 bus = kzalloc(alloc_size, GFP_KERNEL);
60 if (bus) {
61 bus->state = MDIOBUS_ALLOCATED;
62 if (size)
63 bus->priv = (void *)bus + aligned_size;
64 }
65
66 return bus;
67}
68EXPORT_SYMBOL(mdiobus_alloc_size);
69
70/**
71 * mdiobus_release - mii_bus device release callback
72 * @d: the target struct device that contains the mii_bus
73 *
74 * Description: called when the last reference to an mii_bus is
75 * dropped, to free the underlying memory.
76 */
77static void mdiobus_release(struct device *d)
78{
79 struct mii_bus *bus = to_mii_bus(d);
80 BUG_ON(bus->state != MDIOBUS_RELEASED &&
81 /* for compatibility with error handling in drivers */
82 bus->state != MDIOBUS_ALLOCATED);
83 kfree(bus);
84}
85
86static struct class mdio_bus_class = {
87 .name = "mdio_bus",
88 .dev_release = mdiobus_release,
89};
90
91#if IS_ENABLED(CONFIG_OF_MDIO)
92/* Helper function for of_mdio_find_bus */
93static int of_mdio_bus_match(struct device *dev, void *mdio_bus_np)
94{
95 return dev->of_node == mdio_bus_np;
96}
97/**
98 * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
99 * @mdio_bus_np: Pointer to the mii_bus.
100 *
101 * Returns a pointer to the mii_bus, or NULL if none found.
102 *
103 * Because the association of a device_node and mii_bus is made via
104 * of_mdiobus_register(), the mii_bus cannot be found before it is
105 * registered with of_mdiobus_register().
106 *
107 */
108struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
109{
110 struct device *d;
111
112 if (!mdio_bus_np)
113 return NULL;
114
115 d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np,
116 of_mdio_bus_match);
117
118 return d ? to_mii_bus(d) : NULL;
119}
120EXPORT_SYMBOL(of_mdio_find_bus);
121#endif
122
123/**
124 * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
125 * @bus: target mii_bus
126 *
127 * Description: Called by a bus driver to bring up all the PHYs
128 * on a given bus, and attach them to the bus.
129 *
130 * Returns 0 on success or < 0 on error.
131 */
132int mdiobus_register(struct mii_bus *bus)
133{
134 int i, err;
135
136 if (NULL == bus || NULL == bus->name ||
137 NULL == bus->read ||
138 NULL == bus->write)
139 return -EINVAL;
140
141 BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
142 bus->state != MDIOBUS_UNREGISTERED);
143
144 bus->dev.parent = bus->parent;
145 bus->dev.class = &mdio_bus_class;
146 bus->dev.groups = NULL;
147 dev_set_name(&bus->dev, "%s", bus->id);
148
149 err = device_register(&bus->dev);
150 if (err) {
151 printk(KERN_ERR "mii_bus %s failed to register\n", bus->id);
152 return -EINVAL;
153 }
154
155 mutex_init(&bus->mdio_lock);
156
157 if (bus->reset)
158 bus->reset(bus);
159
160 for (i = 0; i < PHY_MAX_ADDR; i++) {
161 if ((bus->phy_mask & (1 << i)) == 0) {
162 struct phy_device *phydev;
163
164 phydev = mdiobus_scan(bus, i);
165 if (IS_ERR(phydev)) {
166 err = PTR_ERR(phydev);
167 goto error;
168 }
169 }
170 }
171
172 bus->state = MDIOBUS_REGISTERED;
173 pr_info("%s: probed\n", bus->name);
174 return 0;
175
176error:
177 while (--i >= 0) {
178 if (bus->phy_map[i])
179 device_unregister(&bus->phy_map[i]->dev);
180 }
181 device_del(&bus->dev);
182 return err;
183}
184EXPORT_SYMBOL(mdiobus_register);
185
186void mdiobus_unregister(struct mii_bus *bus)
187{
188 int i;
189
190 BUG_ON(bus->state != MDIOBUS_REGISTERED);
191 bus->state = MDIOBUS_UNREGISTERED;
192
193 device_del(&bus->dev);
194 for (i = 0; i < PHY_MAX_ADDR; i++) {
195 if (bus->phy_map[i])
196 device_unregister(&bus->phy_map[i]->dev);
197 bus->phy_map[i] = NULL;
198 }
199}
200EXPORT_SYMBOL(mdiobus_unregister);
201
202/**
203 * mdiobus_free - free a struct mii_bus
204 * @bus: mii_bus to free
205 *
206 * This function releases the reference to the underlying device
207 * object in the mii_bus. If this is the last reference, the mii_bus
208 * will be freed.
209 */
210void mdiobus_free(struct mii_bus *bus)
211{
212 /*
213 * For compatibility with error handling in drivers.
214 */
215 if (bus->state == MDIOBUS_ALLOCATED) {
216 kfree(bus);
217 return;
218 }
219
220 BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
221 bus->state = MDIOBUS_RELEASED;
222
223 put_device(&bus->dev);
224}
225EXPORT_SYMBOL(mdiobus_free);
226
227struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
228{
229 struct phy_device *phydev;
230 int err;
231
232 phydev = get_phy_device(bus, addr);
233 if (IS_ERR(phydev) || phydev == NULL)
234 return phydev;
235
236 err = phy_device_register(phydev);
237 if (err) {
238 phy_device_free(phydev);
239 return NULL;
240 }
241
242 return phydev;
243}
244EXPORT_SYMBOL(mdiobus_scan);
245
246/**
247 * mdiobus_read - Convenience function for reading a given MII mgmt register
248 * @bus: the mii_bus struct
249 * @addr: the phy address
250 * @regnum: register number to read
251 *
252 * NOTE: MUST NOT be called from interrupt context,
253 * because the bus read/write functions may wait for an interrupt
254 * to conclude the operation.
255 */
256int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
257{
258 int retval;
259
260 BUG_ON(in_interrupt());
261
262 mutex_lock(&bus->mdio_lock);
263 retval = bus->read(bus, addr, regnum);
264 mutex_unlock(&bus->mdio_lock);
265
266 return retval;
267}
268EXPORT_SYMBOL(mdiobus_read);
269
270/**
271 * mdiobus_write - Convenience function for writing a given MII mgmt register
272 * @bus: the mii_bus struct
273 * @addr: the phy address
274 * @regnum: register number to write
275 * @val: value to write to @regnum
276 *
277 * NOTE: MUST NOT be called from interrupt context,
278 * because the bus read/write functions may wait for an interrupt
279 * to conclude the operation.
280 */
281int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
282{
283 int err;
284
285 BUG_ON(in_interrupt());
286
287 mutex_lock(&bus->mdio_lock);
288 err = bus->write(bus, addr, regnum, val);
289 mutex_unlock(&bus->mdio_lock);
290
291 return err;
292}
293EXPORT_SYMBOL(mdiobus_write);
294
295/**
296 * mdio_bus_match - determine if given PHY driver supports the given PHY device
297 * @dev: target PHY device
298 * @drv: given PHY driver
299 *
300 * Description: Given a PHY device, and a PHY driver, return 1 if
301 * the driver supports the device. Otherwise, return 0.
302 */
303static int mdio_bus_match(struct device *dev, struct device_driver *drv)
304{
305 struct phy_device *phydev = to_phy_device(dev);
306 struct phy_driver *phydrv = to_phy_driver(drv);
307
308 return ((phydrv->phy_id & phydrv->phy_id_mask) ==
309 (phydev->phy_id & phydrv->phy_id_mask));
310}
311
312#ifdef CONFIG_PM
313
314static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
315{
316 struct device_driver *drv = phydev->dev.driver;
317 struct phy_driver *phydrv = to_phy_driver(drv);
318 struct net_device *netdev = phydev->attached_dev;
319
320 if (!drv || !phydrv->suspend)
321 return false;
322
323 /* PHY not attached? May suspend. */
324 if (!netdev)
325 return true;
326
327 /*
328 * Don't suspend PHY if the attched netdev parent may wakeup.
329 * The parent may point to a PCI device, as in tg3 driver.
330 */
331 if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
332 return false;
333
334 /*
335 * Also don't suspend PHY if the netdev itself may wakeup. This
336 * is the case for devices w/o underlaying pwr. mgmt. aware bus,
337 * e.g. SoC devices.
338 */
339 if (device_may_wakeup(&netdev->dev))
340 return false;
341
342 return true;
343}
344
345static int mdio_bus_suspend(struct device *dev)
346{
347 struct phy_driver *phydrv = to_phy_driver(dev->driver);
348 struct phy_device *phydev = to_phy_device(dev);
349
350 /*
351 * We must stop the state machine manually, otherwise it stops out of
352 * control, possibly with the phydev->lock held. Upon resume, netdev
353 * may call phy routines that try to grab the same lock, and that may
354 * lead to a deadlock.
355 */
356 if (phydev->attached_dev && phydev->adjust_link)
357 phy_stop_machine(phydev);
358
359 if (!mdio_bus_phy_may_suspend(phydev))
360 return 0;
361
362 return phydrv->suspend(phydev);
363}
364
365static int mdio_bus_resume(struct device *dev)
366{
367 struct phy_driver *phydrv = to_phy_driver(dev->driver);
368 struct phy_device *phydev = to_phy_device(dev);
369 int ret;
370
371 if (!mdio_bus_phy_may_suspend(phydev))
372 goto no_resume;
373
374 ret = phydrv->resume(phydev);
375 if (ret < 0)
376 return ret;
377
378no_resume:
379 if (phydev->attached_dev && phydev->adjust_link)
380 phy_start_machine(phydev, NULL);
381
382 return 0;
383}
384
385static int mdio_bus_restore(struct device *dev)
386{
387 struct phy_device *phydev = to_phy_device(dev);
388 struct net_device *netdev = phydev->attached_dev;
389 int ret;
390
391 if (!netdev)
392 return 0;
393
394 ret = phy_init_hw(phydev);
395 if (ret < 0)
396 return ret;
397
398 /* The PHY needs to renegotiate. */
399 phydev->link = 0;
400 phydev->state = PHY_UP;
401
402 phy_start_machine(phydev, NULL);
403
404 return 0;
405}
406
407static struct dev_pm_ops mdio_bus_pm_ops = {
408 .suspend = mdio_bus_suspend,
409 .resume = mdio_bus_resume,
410 .freeze = mdio_bus_suspend,
411 .thaw = mdio_bus_resume,
412 .restore = mdio_bus_restore,
413};
414
415#define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops)
416
417#else
418
419#define MDIO_BUS_PM_OPS NULL
420
421#endif /* CONFIG_PM */
422
423struct bus_type mdio_bus_type = {
424 .name = "mdio_bus",
425 .match = mdio_bus_match,
426 .pm = MDIO_BUS_PM_OPS,
427};
428EXPORT_SYMBOL(mdio_bus_type);
429
430int __init mdio_bus_init(void)
431{
432 int ret;
433
434 ret = class_register(&mdio_bus_class);
435 if (!ret) {
436 ret = bus_register(&mdio_bus_type);
437 if (ret)
438 class_unregister(&mdio_bus_class);
439 }
440
441 return ret;
442}
443
444void mdio_bus_exit(void)
445{
446 class_unregister(&mdio_bus_class);
447 bus_unregister(&mdio_bus_type);
448}